1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2021 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
30 #if BFD_SUPPORTS_PLUGINS
31 #include "plugin-api.h"
42 /* This struct is used to pass information to routines called via
43 elf_link_hash_traverse which must return failure. */
45 struct elf_info_failed
47 struct bfd_link_info
*info
;
51 /* This structure is used to pass information to
52 _bfd_elf_link_find_version_dependencies. */
54 struct elf_find_verdep_info
56 /* General link information. */
57 struct bfd_link_info
*info
;
58 /* The number of dependencies. */
60 /* Whether we had a failure. */
64 static bfd_boolean _bfd_elf_fix_symbol_flags
65 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
68 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
69 unsigned long r_symndx
,
72 if (r_symndx
>= cookie
->locsymcount
73 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
75 struct elf_link_hash_entry
*h
;
77 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
79 while (h
->root
.type
== bfd_link_hash_indirect
80 || h
->root
.type
== bfd_link_hash_warning
)
81 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
83 if ((h
->root
.type
== bfd_link_hash_defined
84 || h
->root
.type
== bfd_link_hash_defweak
)
85 && discarded_section (h
->root
.u
.def
.section
))
86 return h
->root
.u
.def
.section
;
92 /* It's not a relocation against a global symbol,
93 but it could be a relocation against a local
94 symbol for a discarded section. */
96 Elf_Internal_Sym
*isym
;
98 /* Need to: get the symbol; get the section. */
99 isym
= &cookie
->locsyms
[r_symndx
];
100 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
102 && discard
? discarded_section (isec
) : 1)
108 /* Define a symbol in a dynamic linkage section. */
110 struct elf_link_hash_entry
*
111 _bfd_elf_define_linkage_sym (bfd
*abfd
,
112 struct bfd_link_info
*info
,
116 struct elf_link_hash_entry
*h
;
117 struct bfd_link_hash_entry
*bh
;
118 const struct elf_backend_data
*bed
;
120 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
123 /* Zap symbol defined in an as-needed lib that wasn't linked.
124 This is a symptom of a larger problem: Absolute symbols
125 defined in shared libraries can't be overridden, because we
126 lose the link to the bfd which is via the symbol section. */
127 h
->root
.type
= bfd_link_hash_new
;
133 bed
= get_elf_backend_data (abfd
);
134 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
135 sec
, 0, NULL
, FALSE
, bed
->collect
,
138 h
= (struct elf_link_hash_entry
*) bh
;
139 BFD_ASSERT (h
!= NULL
);
142 h
->root
.linker_def
= 1;
143 h
->type
= STT_OBJECT
;
144 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
145 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
147 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
152 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
156 struct elf_link_hash_entry
*h
;
157 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
158 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
160 /* This function may be called more than once. */
161 if (htab
->sgot
!= NULL
)
164 flags
= bed
->dynamic_sec_flags
;
166 s
= bfd_make_section_anyway_with_flags (abfd
,
167 (bed
->rela_plts_and_copies_p
168 ? ".rela.got" : ".rel.got"),
169 (bed
->dynamic_sec_flags
172 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
176 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
178 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
182 if (bed
->want_got_plt
)
184 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
186 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
191 /* The first bit of the global offset table is the header. */
192 s
->size
+= bed
->got_header_size
;
194 if (bed
->want_got_sym
)
196 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
197 (or .got.plt) section. We don't do this in the linker script
198 because we don't want to define the symbol if we are not creating
199 a global offset table. */
200 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
201 "_GLOBAL_OFFSET_TABLE_");
202 elf_hash_table (info
)->hgot
= h
;
210 /* Create a strtab to hold the dynamic symbol names. */
212 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
214 struct elf_link_hash_table
*hash_table
;
216 hash_table
= elf_hash_table (info
);
217 if (hash_table
->dynobj
== NULL
)
219 /* We may not set dynobj, an input file holding linker created
220 dynamic sections to abfd, which may be a dynamic object with
221 its own dynamic sections. We need to find a normal input file
222 to hold linker created sections if possible. */
223 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
227 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
229 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
230 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
231 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
232 && !((s
= ibfd
->sections
) != NULL
233 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
239 hash_table
->dynobj
= abfd
;
242 if (hash_table
->dynstr
== NULL
)
244 hash_table
->dynstr
= _bfd_elf_strtab_init ();
245 if (hash_table
->dynstr
== NULL
)
251 /* Create some sections which will be filled in with dynamic linking
252 information. ABFD is an input file which requires dynamic sections
253 to be created. The dynamic sections take up virtual memory space
254 when the final executable is run, so we need to create them before
255 addresses are assigned to the output sections. We work out the
256 actual contents and size of these sections later. */
259 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
263 const struct elf_backend_data
*bed
;
264 struct elf_link_hash_entry
*h
;
266 if (! is_elf_hash_table (info
->hash
))
269 if (elf_hash_table (info
)->dynamic_sections_created
)
272 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
275 abfd
= elf_hash_table (info
)->dynobj
;
276 bed
= get_elf_backend_data (abfd
);
278 flags
= bed
->dynamic_sec_flags
;
280 /* A dynamically linked executable has a .interp section, but a
281 shared library does not. */
282 if (bfd_link_executable (info
) && !info
->nointerp
)
284 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
285 flags
| SEC_READONLY
);
290 /* Create sections to hold version informations. These are removed
291 if they are not needed. */
292 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
293 flags
| SEC_READONLY
);
295 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
298 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
299 flags
| SEC_READONLY
);
301 || !bfd_set_section_alignment (s
, 1))
304 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
305 flags
| SEC_READONLY
);
307 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
310 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
311 flags
| SEC_READONLY
);
313 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
315 elf_hash_table (info
)->dynsym
= s
;
317 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
318 flags
| SEC_READONLY
);
322 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
324 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
327 /* The special symbol _DYNAMIC is always set to the start of the
328 .dynamic section. We could set _DYNAMIC in a linker script, but we
329 only want to define it if we are, in fact, creating a .dynamic
330 section. We don't want to define it if there is no .dynamic
331 section, since on some ELF platforms the start up code examines it
332 to decide how to initialize the process. */
333 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
334 elf_hash_table (info
)->hdynamic
= h
;
340 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
341 flags
| SEC_READONLY
);
343 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
345 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
348 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
350 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
351 flags
| SEC_READONLY
);
353 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
355 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
356 4 32-bit words followed by variable count of 64-bit words, then
357 variable count of 32-bit words. */
358 if (bed
->s
->arch_size
== 64)
359 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
361 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
364 /* Let the backend create the rest of the sections. This lets the
365 backend set the right flags. The backend will normally create
366 the .got and .plt sections. */
367 if (bed
->elf_backend_create_dynamic_sections
== NULL
368 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
371 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
376 /* Create dynamic sections when linking against a dynamic object. */
379 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
381 flagword flags
, pltflags
;
382 struct elf_link_hash_entry
*h
;
384 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
385 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
387 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
388 .rel[a].bss sections. */
389 flags
= bed
->dynamic_sec_flags
;
392 if (bed
->plt_not_loaded
)
393 /* We do not clear SEC_ALLOC here because we still want the OS to
394 allocate space for the section; it's just that there's nothing
395 to read in from the object file. */
396 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
398 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
399 if (bed
->plt_readonly
)
400 pltflags
|= SEC_READONLY
;
402 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
404 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
408 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
410 if (bed
->want_plt_sym
)
412 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
413 "_PROCEDURE_LINKAGE_TABLE_");
414 elf_hash_table (info
)->hplt
= h
;
419 s
= bfd_make_section_anyway_with_flags (abfd
,
420 (bed
->rela_plts_and_copies_p
421 ? ".rela.plt" : ".rel.plt"),
422 flags
| SEC_READONLY
);
424 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
428 if (! _bfd_elf_create_got_section (abfd
, info
))
431 if (bed
->want_dynbss
)
433 /* The .dynbss section is a place to put symbols which are defined
434 by dynamic objects, are referenced by regular objects, and are
435 not functions. We must allocate space for them in the process
436 image and use a R_*_COPY reloc to tell the dynamic linker to
437 initialize them at run time. The linker script puts the .dynbss
438 section into the .bss section of the final image. */
439 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
440 SEC_ALLOC
| SEC_LINKER_CREATED
);
445 if (bed
->want_dynrelro
)
447 /* Similarly, but for symbols that were originally in read-only
448 sections. This section doesn't really need to have contents,
449 but make it like other .data.rel.ro sections. */
450 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
457 /* The .rel[a].bss section holds copy relocs. This section is not
458 normally needed. We need to create it here, though, so that the
459 linker will map it to an output section. We can't just create it
460 only if we need it, because we will not know whether we need it
461 until we have seen all the input files, and the first time the
462 main linker code calls BFD after examining all the input files
463 (size_dynamic_sections) the input sections have already been
464 mapped to the output sections. If the section turns out not to
465 be needed, we can discard it later. We will never need this
466 section when generating a shared object, since they do not use
468 if (bfd_link_executable (info
))
470 s
= bfd_make_section_anyway_with_flags (abfd
,
471 (bed
->rela_plts_and_copies_p
472 ? ".rela.bss" : ".rel.bss"),
473 flags
| SEC_READONLY
);
475 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
479 if (bed
->want_dynrelro
)
481 s
= (bfd_make_section_anyway_with_flags
482 (abfd
, (bed
->rela_plts_and_copies_p
483 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
484 flags
| SEC_READONLY
));
486 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
488 htab
->sreldynrelro
= s
;
496 /* Record a new dynamic symbol. We record the dynamic symbols as we
497 read the input files, since we need to have a list of all of them
498 before we can determine the final sizes of the output sections.
499 Note that we may actually call this function even though we are not
500 going to output any dynamic symbols; in some cases we know that a
501 symbol should be in the dynamic symbol table, but only if there is
505 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
506 struct elf_link_hash_entry
*h
)
508 if (h
->dynindx
== -1)
510 struct elf_strtab_hash
*dynstr
;
515 if (h
->root
.type
== bfd_link_hash_defined
516 || h
->root
.type
== bfd_link_hash_defweak
)
518 /* An IR symbol should not be made dynamic. */
519 if (h
->root
.u
.def
.section
!= NULL
520 && h
->root
.u
.def
.section
->owner
!= NULL
521 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
525 /* XXX: The ABI draft says the linker must turn hidden and
526 internal symbols into STB_LOCAL symbols when producing the
527 DSO. However, if ld.so honors st_other in the dynamic table,
528 this would not be necessary. */
529 switch (ELF_ST_VISIBILITY (h
->other
))
533 if (h
->root
.type
!= bfd_link_hash_undefined
534 && h
->root
.type
!= bfd_link_hash_undefweak
)
537 if (!elf_hash_table (info
)->is_relocatable_executable
538 || ((h
->root
.type
== bfd_link_hash_defined
539 || h
->root
.type
== bfd_link_hash_defweak
)
540 && h
->root
.u
.def
.section
->owner
!= NULL
541 && h
->root
.u
.def
.section
->owner
->no_export
)
542 || (h
->root
.type
== bfd_link_hash_common
543 && h
->root
.u
.c
.p
->section
->owner
!= NULL
544 && h
->root
.u
.c
.p
->section
->owner
->no_export
))
552 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
553 ++elf_hash_table (info
)->dynsymcount
;
555 dynstr
= elf_hash_table (info
)->dynstr
;
558 /* Create a strtab to hold the dynamic symbol names. */
559 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
564 /* We don't put any version information in the dynamic string
566 name
= h
->root
.root
.string
;
567 p
= strchr (name
, ELF_VER_CHR
);
569 /* We know that the p points into writable memory. In fact,
570 there are only a few symbols that have read-only names, being
571 those like _GLOBAL_OFFSET_TABLE_ that are created specially
572 by the backends. Most symbols will have names pointing into
573 an ELF string table read from a file, or to objalloc memory. */
576 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
581 if (indx
== (size_t) -1)
583 h
->dynstr_index
= indx
;
589 /* Mark a symbol dynamic. */
592 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
593 struct elf_link_hash_entry
*h
,
594 Elf_Internal_Sym
*sym
)
596 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
598 /* It may be called more than once on the same H. */
599 if(h
->dynamic
|| bfd_link_relocatable (info
))
602 if ((info
->dynamic_data
603 && (h
->type
== STT_OBJECT
604 || h
->type
== STT_COMMON
606 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
607 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
610 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
613 /* NB: If a symbol is made dynamic by --dynamic-list, it has
615 h
->root
.non_ir_ref_dynamic
= 1;
619 /* Record an assignment to a symbol made by a linker script. We need
620 this in case some dynamic object refers to this symbol. */
623 bfd_elf_record_link_assignment (bfd
*output_bfd
,
624 struct bfd_link_info
*info
,
629 struct elf_link_hash_entry
*h
, *hv
;
630 struct elf_link_hash_table
*htab
;
631 const struct elf_backend_data
*bed
;
633 if (!is_elf_hash_table (info
->hash
))
636 htab
= elf_hash_table (info
);
637 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
641 if (h
->root
.type
== bfd_link_hash_warning
)
642 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
644 if (h
->versioned
== unknown
)
646 /* Set versioned if symbol version is unknown. */
647 char *version
= strrchr (name
, ELF_VER_CHR
);
650 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
651 h
->versioned
= versioned_hidden
;
653 h
->versioned
= versioned
;
657 /* Symbols defined in a linker script but not referenced anywhere
658 else will have non_elf set. */
661 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
665 switch (h
->root
.type
)
667 case bfd_link_hash_defined
:
668 case bfd_link_hash_defweak
:
669 case bfd_link_hash_common
:
671 case bfd_link_hash_undefweak
:
672 case bfd_link_hash_undefined
:
673 /* Since we're defining the symbol, don't let it seem to have not
674 been defined. record_dynamic_symbol and size_dynamic_sections
675 may depend on this. */
676 h
->root
.type
= bfd_link_hash_new
;
677 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
678 bfd_link_repair_undef_list (&htab
->root
);
680 case bfd_link_hash_new
:
682 case bfd_link_hash_indirect
:
683 /* We had a versioned symbol in a dynamic library. We make the
684 the versioned symbol point to this one. */
685 bed
= get_elf_backend_data (output_bfd
);
687 while (hv
->root
.type
== bfd_link_hash_indirect
688 || hv
->root
.type
== bfd_link_hash_warning
)
689 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
690 /* We don't need to update h->root.u since linker will set them
692 h
->root
.type
= bfd_link_hash_undefined
;
693 hv
->root
.type
= bfd_link_hash_indirect
;
694 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
695 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
702 /* If this symbol is being provided by the linker script, and it is
703 currently defined by a dynamic object, but not by a regular
704 object, then mark it as undefined so that the generic linker will
705 force the correct value. */
709 h
->root
.type
= bfd_link_hash_undefined
;
711 /* If this symbol is currently defined by a dynamic object, but not
712 by a regular object, then clear out any version information because
713 the symbol will not be associated with the dynamic object any
715 if (h
->def_dynamic
&& !h
->def_regular
)
716 h
->verinfo
.verdef
= NULL
;
718 /* Make sure this symbol is not garbage collected. */
725 bed
= get_elf_backend_data (output_bfd
);
726 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
727 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
728 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
731 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
733 if (!bfd_link_relocatable (info
)
735 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
736 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
741 || bfd_link_dll (info
)
742 || elf_hash_table (info
)->is_relocatable_executable
)
746 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
749 /* If this is a weak defined symbol, and we know a corresponding
750 real symbol from the same dynamic object, make sure the real
751 symbol is also made into a dynamic symbol. */
754 struct elf_link_hash_entry
*def
= weakdef (h
);
756 if (def
->dynindx
== -1
757 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
765 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
766 success, and 2 on a failure caused by attempting to record a symbol
767 in a discarded section, eg. a discarded link-once section symbol. */
770 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
775 struct elf_link_local_dynamic_entry
*entry
;
776 struct elf_link_hash_table
*eht
;
777 struct elf_strtab_hash
*dynstr
;
780 Elf_External_Sym_Shndx eshndx
;
781 char esym
[sizeof (Elf64_External_Sym
)];
783 if (! is_elf_hash_table (info
->hash
))
786 /* See if the entry exists already. */
787 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
788 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
791 amt
= sizeof (*entry
);
792 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
796 /* Go find the symbol, so that we can find it's name. */
797 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
798 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
800 bfd_release (input_bfd
, entry
);
804 if (entry
->isym
.st_shndx
!= SHN_UNDEF
805 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
809 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
810 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
812 /* We can still bfd_release here as nothing has done another
813 bfd_alloc. We can't do this later in this function. */
814 bfd_release (input_bfd
, entry
);
819 name
= (bfd_elf_string_from_elf_section
820 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
821 entry
->isym
.st_name
));
823 dynstr
= elf_hash_table (info
)->dynstr
;
826 /* Create a strtab to hold the dynamic symbol names. */
827 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
832 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
833 if (dynstr_index
== (size_t) -1)
835 entry
->isym
.st_name
= dynstr_index
;
837 eht
= elf_hash_table (info
);
839 entry
->next
= eht
->dynlocal
;
840 eht
->dynlocal
= entry
;
841 entry
->input_bfd
= input_bfd
;
842 entry
->input_indx
= input_indx
;
845 /* Whatever binding the symbol had before, it's now local. */
847 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
849 /* The dynindx will be set at the end of size_dynamic_sections. */
854 /* Return the dynindex of a local dynamic symbol. */
857 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
861 struct elf_link_local_dynamic_entry
*e
;
863 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
864 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
869 /* This function is used to renumber the dynamic symbols, if some of
870 them are removed because they are marked as local. This is called
871 via elf_link_hash_traverse. */
874 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
877 size_t *count
= (size_t *) data
;
882 if (h
->dynindx
!= -1)
883 h
->dynindx
= ++(*count
);
889 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
890 STB_LOCAL binding. */
893 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
896 size_t *count
= (size_t *) data
;
898 if (!h
->forced_local
)
901 if (h
->dynindx
!= -1)
902 h
->dynindx
= ++(*count
);
907 /* Return true if the dynamic symbol for a given section should be
908 omitted when creating a shared library. */
910 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
911 struct bfd_link_info
*info
,
914 struct elf_link_hash_table
*htab
;
917 switch (elf_section_data (p
)->this_hdr
.sh_type
)
921 /* If sh_type is yet undecided, assume it could be
922 SHT_PROGBITS/SHT_NOBITS. */
924 htab
= elf_hash_table (info
);
925 if (htab
->text_index_section
!= NULL
)
926 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
928 return (htab
->dynobj
!= NULL
929 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
930 && ip
->output_section
== p
);
932 /* There shouldn't be section relative relocations
933 against any other section. */
940 _bfd_elf_omit_section_dynsym_all
941 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
942 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
943 asection
*p ATTRIBUTE_UNUSED
)
948 /* Assign dynsym indices. In a shared library we generate a section
949 symbol for each output section, which come first. Next come symbols
950 which have been forced to local binding. Then all of the back-end
951 allocated local dynamic syms, followed by the rest of the global
952 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
953 (This prevents the early call before elf_backend_init_index_section
954 and strip_excluded_output_sections setting dynindx for sections
955 that are stripped.) */
958 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
959 struct bfd_link_info
*info
,
960 unsigned long *section_sym_count
)
962 unsigned long dynsymcount
= 0;
963 bfd_boolean do_sec
= section_sym_count
!= NULL
;
965 if (bfd_link_pic (info
)
966 || elf_hash_table (info
)->is_relocatable_executable
)
968 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
970 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
971 if ((p
->flags
& SEC_EXCLUDE
) == 0
972 && (p
->flags
& SEC_ALLOC
) != 0
973 && elf_hash_table (info
)->dynamic_relocs
974 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
978 elf_section_data (p
)->dynindx
= dynsymcount
;
981 elf_section_data (p
)->dynindx
= 0;
984 *section_sym_count
= dynsymcount
;
986 elf_link_hash_traverse (elf_hash_table (info
),
987 elf_link_renumber_local_hash_table_dynsyms
,
990 if (elf_hash_table (info
)->dynlocal
)
992 struct elf_link_local_dynamic_entry
*p
;
993 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
994 p
->dynindx
= ++dynsymcount
;
996 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
998 elf_link_hash_traverse (elf_hash_table (info
),
999 elf_link_renumber_hash_table_dynsyms
,
1002 /* There is an unused NULL entry at the head of the table which we
1003 must account for in our count even if the table is empty since it
1004 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
1005 .dynamic section. */
1008 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
1012 /* Merge st_other field. */
1015 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
1016 unsigned int st_other
, asection
*sec
,
1017 bfd_boolean definition
, bfd_boolean dynamic
)
1019 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1021 /* If st_other has a processor-specific meaning, specific
1022 code might be needed here. */
1023 if (bed
->elf_backend_merge_symbol_attribute
)
1024 (*bed
->elf_backend_merge_symbol_attribute
) (h
, st_other
, definition
,
1029 unsigned symvis
= ELF_ST_VISIBILITY (st_other
);
1030 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1032 /* Keep the most constraining visibility. Leave the remainder
1033 of the st_other field to elf_backend_merge_symbol_attribute. */
1034 if (symvis
- 1 < hvis
- 1)
1035 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1038 && ELF_ST_VISIBILITY (st_other
) != STV_DEFAULT
1039 && (sec
->flags
& SEC_READONLY
) == 0)
1040 h
->protected_def
= 1;
1043 /* This function is called when we want to merge a new symbol with an
1044 existing symbol. It handles the various cases which arise when we
1045 find a definition in a dynamic object, or when there is already a
1046 definition in a dynamic object. The new symbol is described by
1047 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1048 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1049 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1050 of an old common symbol. We set OVERRIDE if the old symbol is
1051 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1052 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1053 to change. By OK to change, we mean that we shouldn't warn if the
1054 type or size does change. */
1057 _bfd_elf_merge_symbol (bfd
*abfd
,
1058 struct bfd_link_info
*info
,
1060 Elf_Internal_Sym
*sym
,
1063 struct elf_link_hash_entry
**sym_hash
,
1065 bfd_boolean
*pold_weak
,
1066 unsigned int *pold_alignment
,
1069 bfd_boolean
*type_change_ok
,
1070 bfd_boolean
*size_change_ok
,
1071 bfd_boolean
*matched
)
1073 asection
*sec
, *oldsec
;
1074 struct elf_link_hash_entry
*h
;
1075 struct elf_link_hash_entry
*hi
;
1076 struct elf_link_hash_entry
*flip
;
1079 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1080 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
1081 const struct elf_backend_data
*bed
;
1083 bfd_boolean default_sym
= *matched
;
1089 bind
= ELF_ST_BIND (sym
->st_info
);
1091 if (! bfd_is_und_section (sec
))
1092 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
1094 h
= ((struct elf_link_hash_entry
*)
1095 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
1100 bed
= get_elf_backend_data (abfd
);
1102 /* NEW_VERSION is the symbol version of the new symbol. */
1103 if (h
->versioned
!= unversioned
)
1105 /* Symbol version is unknown or versioned. */
1106 new_version
= strrchr (name
, ELF_VER_CHR
);
1109 if (h
->versioned
== unknown
)
1111 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1112 h
->versioned
= versioned_hidden
;
1114 h
->versioned
= versioned
;
1117 if (new_version
[0] == '\0')
1121 h
->versioned
= unversioned
;
1126 /* For merging, we only care about real symbols. But we need to make
1127 sure that indirect symbol dynamic flags are updated. */
1129 while (h
->root
.type
== bfd_link_hash_indirect
1130 || h
->root
.type
== bfd_link_hash_warning
)
1131 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1135 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1139 /* OLD_HIDDEN is true if the existing symbol is only visible
1140 to the symbol with the same symbol version. NEW_HIDDEN is
1141 true if the new symbol is only visible to the symbol with
1142 the same symbol version. */
1143 bfd_boolean old_hidden
= h
->versioned
== versioned_hidden
;
1144 bfd_boolean new_hidden
= hi
->versioned
== versioned_hidden
;
1145 if (!old_hidden
&& !new_hidden
)
1146 /* The new symbol matches the existing symbol if both
1151 /* OLD_VERSION is the symbol version of the existing
1155 if (h
->versioned
>= versioned
)
1156 old_version
= strrchr (h
->root
.root
.string
,
1161 /* The new symbol matches the existing symbol if they
1162 have the same symbol version. */
1163 *matched
= (old_version
== new_version
1164 || (old_version
!= NULL
1165 && new_version
!= NULL
1166 && strcmp (old_version
, new_version
) == 0));
1171 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1176 switch (h
->root
.type
)
1181 case bfd_link_hash_undefined
:
1182 case bfd_link_hash_undefweak
:
1183 oldbfd
= h
->root
.u
.undef
.abfd
;
1186 case bfd_link_hash_defined
:
1187 case bfd_link_hash_defweak
:
1188 oldbfd
= h
->root
.u
.def
.section
->owner
;
1189 oldsec
= h
->root
.u
.def
.section
;
1192 case bfd_link_hash_common
:
1193 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1194 oldsec
= h
->root
.u
.c
.p
->section
;
1196 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1199 if (poldbfd
&& *poldbfd
== NULL
)
1202 /* Differentiate strong and weak symbols. */
1203 newweak
= bind
== STB_WEAK
;
1204 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1205 || h
->root
.type
== bfd_link_hash_undefweak
);
1207 *pold_weak
= oldweak
;
1209 /* We have to check it for every instance since the first few may be
1210 references and not all compilers emit symbol type for undefined
1212 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1214 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1215 respectively, is from a dynamic object. */
1217 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1219 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1220 syms and defined syms in dynamic libraries respectively.
1221 ref_dynamic on the other hand can be set for a symbol defined in
1222 a dynamic library, and def_dynamic may not be set; When the
1223 definition in a dynamic lib is overridden by a definition in the
1224 executable use of the symbol in the dynamic lib becomes a
1225 reference to the executable symbol. */
1228 if (bfd_is_und_section (sec
))
1230 if (bind
!= STB_WEAK
)
1232 h
->ref_dynamic_nonweak
= 1;
1233 hi
->ref_dynamic_nonweak
= 1;
1238 /* Update the existing symbol only if they match. */
1241 hi
->dynamic_def
= 1;
1245 /* If we just created the symbol, mark it as being an ELF symbol.
1246 Other than that, there is nothing to do--there is no merge issue
1247 with a newly defined symbol--so we just return. */
1249 if (h
->root
.type
== bfd_link_hash_new
)
1255 /* In cases involving weak versioned symbols, we may wind up trying
1256 to merge a symbol with itself. Catch that here, to avoid the
1257 confusion that results if we try to override a symbol with
1258 itself. The additional tests catch cases like
1259 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1260 dynamic object, which we do want to handle here. */
1262 && (newweak
|| oldweak
)
1263 && ((abfd
->flags
& DYNAMIC
) == 0
1264 || !h
->def_regular
))
1269 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1270 else if (oldsec
!= NULL
)
1272 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1273 indices used by MIPS ELF. */
1274 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1277 /* Handle a case where plugin_notice won't be called and thus won't
1278 set the non_ir_ref flags on the first pass over symbols. */
1280 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
)
1281 && newdyn
!= olddyn
)
1283 h
->root
.non_ir_ref_dynamic
= TRUE
;
1284 hi
->root
.non_ir_ref_dynamic
= TRUE
;
1287 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1288 respectively, appear to be a definition rather than reference. */
1290 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1292 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1293 && h
->root
.type
!= bfd_link_hash_undefweak
1294 && h
->root
.type
!= bfd_link_hash_common
);
1296 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1297 respectively, appear to be a function. */
1299 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1300 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1302 oldfunc
= (h
->type
!= STT_NOTYPE
1303 && bed
->is_function_type (h
->type
));
1305 if (!(newfunc
&& oldfunc
)
1306 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1307 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1308 && h
->type
!= STT_NOTYPE
1309 && (newdef
|| bfd_is_com_section (sec
))
1310 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1312 /* If creating a default indirect symbol ("foo" or "foo@") from
1313 a dynamic versioned definition ("foo@@") skip doing so if
1314 there is an existing regular definition with a different
1315 type. We don't want, for example, a "time" variable in the
1316 executable overriding a "time" function in a shared library. */
1324 /* When adding a symbol from a regular object file after we have
1325 created indirect symbols, undo the indirection and any
1332 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1333 h
->forced_local
= 0;
1337 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1339 h
->root
.type
= bfd_link_hash_undefined
;
1340 h
->root
.u
.undef
.abfd
= abfd
;
1344 h
->root
.type
= bfd_link_hash_new
;
1345 h
->root
.u
.undef
.abfd
= NULL
;
1351 /* Check TLS symbols. We don't check undefined symbols introduced
1352 by "ld -u" which have no type (and oldbfd NULL), and we don't
1353 check symbols from plugins because they also have no type. */
1355 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1356 && (abfd
->flags
& BFD_PLUGIN
) == 0
1357 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1358 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1361 bfd_boolean ntdef
, tdef
;
1362 asection
*ntsec
, *tsec
;
1364 if (h
->type
== STT_TLS
)
1385 /* xgettext:c-format */
1386 (_("%s: TLS definition in %pB section %pA "
1387 "mismatches non-TLS definition in %pB section %pA"),
1388 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1389 else if (!tdef
&& !ntdef
)
1391 /* xgettext:c-format */
1392 (_("%s: TLS reference in %pB "
1393 "mismatches non-TLS reference in %pB"),
1394 h
->root
.root
.string
, tbfd
, ntbfd
);
1397 /* xgettext:c-format */
1398 (_("%s: TLS definition in %pB section %pA "
1399 "mismatches non-TLS reference in %pB"),
1400 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1403 /* xgettext:c-format */
1404 (_("%s: TLS reference in %pB "
1405 "mismatches non-TLS definition in %pB section %pA"),
1406 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1408 bfd_set_error (bfd_error_bad_value
);
1412 /* If the old symbol has non-default visibility, we ignore the new
1413 definition from a dynamic object. */
1415 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1416 && !bfd_is_und_section (sec
))
1419 /* Make sure this symbol is dynamic. */
1421 hi
->ref_dynamic
= 1;
1422 /* A protected symbol has external availability. Make sure it is
1423 recorded as dynamic.
1425 FIXME: Should we check type and size for protected symbol? */
1426 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1427 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1432 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1435 /* If the new symbol with non-default visibility comes from a
1436 relocatable file and the old definition comes from a dynamic
1437 object, we remove the old definition. */
1438 if (hi
->root
.type
== bfd_link_hash_indirect
)
1440 /* Handle the case where the old dynamic definition is
1441 default versioned. We need to copy the symbol info from
1442 the symbol with default version to the normal one if it
1443 was referenced before. */
1446 hi
->root
.type
= h
->root
.type
;
1447 h
->root
.type
= bfd_link_hash_indirect
;
1448 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1450 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1451 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1453 /* If the new symbol is hidden or internal, completely undo
1454 any dynamic link state. */
1455 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1456 h
->forced_local
= 0;
1463 /* FIXME: Should we check type and size for protected symbol? */
1473 /* If the old symbol was undefined before, then it will still be
1474 on the undefs list. If the new symbol is undefined or
1475 common, we can't make it bfd_link_hash_new here, because new
1476 undefined or common symbols will be added to the undefs list
1477 by _bfd_generic_link_add_one_symbol. Symbols may not be
1478 added twice to the undefs list. Also, if the new symbol is
1479 undefweak then we don't want to lose the strong undef. */
1480 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1482 h
->root
.type
= bfd_link_hash_undefined
;
1483 h
->root
.u
.undef
.abfd
= abfd
;
1487 h
->root
.type
= bfd_link_hash_new
;
1488 h
->root
.u
.undef
.abfd
= NULL
;
1491 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1493 /* If the new symbol is hidden or internal, completely undo
1494 any dynamic link state. */
1495 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1496 h
->forced_local
= 0;
1502 /* FIXME: Should we check type and size for protected symbol? */
1508 /* If a new weak symbol definition comes from a regular file and the
1509 old symbol comes from a dynamic library, we treat the new one as
1510 strong. Similarly, an old weak symbol definition from a regular
1511 file is treated as strong when the new symbol comes from a dynamic
1512 library. Further, an old weak symbol from a dynamic library is
1513 treated as strong if the new symbol is from a dynamic library.
1514 This reflects the way glibc's ld.so works.
1516 Also allow a weak symbol to override a linker script symbol
1517 defined by an early pass over the script. This is done so the
1518 linker knows the symbol is defined in an object file, for the
1519 DEFINED script function.
1521 Do this before setting *type_change_ok or *size_change_ok so that
1522 we warn properly when dynamic library symbols are overridden. */
1524 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1526 if (olddef
&& newdyn
)
1529 /* Allow changes between different types of function symbol. */
1530 if (newfunc
&& oldfunc
)
1531 *type_change_ok
= TRUE
;
1533 /* It's OK to change the type if either the existing symbol or the
1534 new symbol is weak. A type change is also OK if the old symbol
1535 is undefined and the new symbol is defined. */
1540 && h
->root
.type
== bfd_link_hash_undefined
))
1541 *type_change_ok
= TRUE
;
1543 /* It's OK to change the size if either the existing symbol or the
1544 new symbol is weak, or if the old symbol is undefined. */
1547 || h
->root
.type
== bfd_link_hash_undefined
)
1548 *size_change_ok
= TRUE
;
1550 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1551 symbol, respectively, appears to be a common symbol in a dynamic
1552 object. If a symbol appears in an uninitialized section, and is
1553 not weak, and is not a function, then it may be a common symbol
1554 which was resolved when the dynamic object was created. We want
1555 to treat such symbols specially, because they raise special
1556 considerations when setting the symbol size: if the symbol
1557 appears as a common symbol in a regular object, and the size in
1558 the regular object is larger, we must make sure that we use the
1559 larger size. This problematic case can always be avoided in C,
1560 but it must be handled correctly when using Fortran shared
1563 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1564 likewise for OLDDYNCOMMON and OLDDEF.
1566 Note that this test is just a heuristic, and that it is quite
1567 possible to have an uninitialized symbol in a shared object which
1568 is really a definition, rather than a common symbol. This could
1569 lead to some minor confusion when the symbol really is a common
1570 symbol in some regular object. However, I think it will be
1576 && (sec
->flags
& SEC_ALLOC
) != 0
1577 && (sec
->flags
& SEC_LOAD
) == 0
1580 newdyncommon
= TRUE
;
1582 newdyncommon
= FALSE
;
1586 && h
->root
.type
== bfd_link_hash_defined
1588 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1589 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1592 olddyncommon
= TRUE
;
1594 olddyncommon
= FALSE
;
1596 /* We now know everything about the old and new symbols. We ask the
1597 backend to check if we can merge them. */
1598 if (bed
->merge_symbol
!= NULL
)
1600 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1605 /* There are multiple definitions of a normal symbol. Skip the
1606 default symbol as well as definition from an IR object. */
1607 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1608 && !default_sym
&& h
->def_regular
1610 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1611 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1613 /* Handle a multiple definition. */
1614 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1615 abfd
, sec
, *pvalue
);
1620 /* If both the old and the new symbols look like common symbols in a
1621 dynamic object, set the size of the symbol to the larger of the
1626 && sym
->st_size
!= h
->size
)
1628 /* Since we think we have two common symbols, issue a multiple
1629 common warning if desired. Note that we only warn if the
1630 size is different. If the size is the same, we simply let
1631 the old symbol override the new one as normally happens with
1632 symbols defined in dynamic objects. */
1634 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1635 bfd_link_hash_common
, sym
->st_size
);
1636 if (sym
->st_size
> h
->size
)
1637 h
->size
= sym
->st_size
;
1639 *size_change_ok
= TRUE
;
1642 /* If we are looking at a dynamic object, and we have found a
1643 definition, we need to see if the symbol was already defined by
1644 some other object. If so, we want to use the existing
1645 definition, and we do not want to report a multiple symbol
1646 definition error; we do this by clobbering *PSEC to be
1647 bfd_und_section_ptr.
1649 We treat a common symbol as a definition if the symbol in the
1650 shared library is a function, since common symbols always
1651 represent variables; this can cause confusion in principle, but
1652 any such confusion would seem to indicate an erroneous program or
1653 shared library. We also permit a common symbol in a regular
1654 object to override a weak symbol in a shared object. */
1659 || (h
->root
.type
== bfd_link_hash_common
1660 && (newweak
|| newfunc
))))
1664 newdyncommon
= FALSE
;
1666 *psec
= sec
= bfd_und_section_ptr
;
1667 *size_change_ok
= TRUE
;
1669 /* If we get here when the old symbol is a common symbol, then
1670 we are explicitly letting it override a weak symbol or
1671 function in a dynamic object, and we don't want to warn about
1672 a type change. If the old symbol is a defined symbol, a type
1673 change warning may still be appropriate. */
1675 if (h
->root
.type
== bfd_link_hash_common
)
1676 *type_change_ok
= TRUE
;
1679 /* Handle the special case of an old common symbol merging with a
1680 new symbol which looks like a common symbol in a shared object.
1681 We change *PSEC and *PVALUE to make the new symbol look like a
1682 common symbol, and let _bfd_generic_link_add_one_symbol do the
1686 && h
->root
.type
== bfd_link_hash_common
)
1690 newdyncommon
= FALSE
;
1691 *pvalue
= sym
->st_size
;
1692 *psec
= sec
= bed
->common_section (oldsec
);
1693 *size_change_ok
= TRUE
;
1696 /* Skip weak definitions of symbols that are already defined. */
1697 if (newdef
&& olddef
&& newweak
)
1699 /* Don't skip new non-IR weak syms. */
1700 if (!(oldbfd
!= NULL
1701 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1702 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1708 /* Merge st_other. If the symbol already has a dynamic index,
1709 but visibility says it should not be visible, turn it into a
1711 elf_merge_st_other (abfd
, h
, sym
->st_other
, sec
, newdef
, newdyn
);
1712 if (h
->dynindx
!= -1)
1713 switch (ELF_ST_VISIBILITY (h
->other
))
1717 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1722 /* If the old symbol is from a dynamic object, and the new symbol is
1723 a definition which is not from a dynamic object, then the new
1724 symbol overrides the old symbol. Symbols from regular files
1725 always take precedence over symbols from dynamic objects, even if
1726 they are defined after the dynamic object in the link.
1728 As above, we again permit a common symbol in a regular object to
1729 override a definition in a shared object if the shared object
1730 symbol is a function or is weak. */
1735 || (bfd_is_com_section (sec
)
1736 && (oldweak
|| oldfunc
)))
1741 /* Change the hash table entry to undefined, and let
1742 _bfd_generic_link_add_one_symbol do the right thing with the
1745 h
->root
.type
= bfd_link_hash_undefined
;
1746 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1747 *size_change_ok
= TRUE
;
1750 olddyncommon
= FALSE
;
1752 /* We again permit a type change when a common symbol may be
1753 overriding a function. */
1755 if (bfd_is_com_section (sec
))
1759 /* If a common symbol overrides a function, make sure
1760 that it isn't defined dynamically nor has type
1763 h
->type
= STT_NOTYPE
;
1765 *type_change_ok
= TRUE
;
1768 if (hi
->root
.type
== bfd_link_hash_indirect
)
1771 /* This union may have been set to be non-NULL when this symbol
1772 was seen in a dynamic object. We must force the union to be
1773 NULL, so that it is correct for a regular symbol. */
1774 h
->verinfo
.vertree
= NULL
;
1777 /* Handle the special case of a new common symbol merging with an
1778 old symbol that looks like it might be a common symbol defined in
1779 a shared object. Note that we have already handled the case in
1780 which a new common symbol should simply override the definition
1781 in the shared library. */
1784 && bfd_is_com_section (sec
)
1787 /* It would be best if we could set the hash table entry to a
1788 common symbol, but we don't know what to use for the section
1789 or the alignment. */
1790 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1791 bfd_link_hash_common
, sym
->st_size
);
1793 /* If the presumed common symbol in the dynamic object is
1794 larger, pretend that the new symbol has its size. */
1796 if (h
->size
> *pvalue
)
1799 /* We need to remember the alignment required by the symbol
1800 in the dynamic object. */
1801 BFD_ASSERT (pold_alignment
);
1802 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1805 olddyncommon
= FALSE
;
1807 h
->root
.type
= bfd_link_hash_undefined
;
1808 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1810 *size_change_ok
= TRUE
;
1811 *type_change_ok
= TRUE
;
1813 if (hi
->root
.type
== bfd_link_hash_indirect
)
1816 h
->verinfo
.vertree
= NULL
;
1821 /* Handle the case where we had a versioned symbol in a dynamic
1822 library and now find a definition in a normal object. In this
1823 case, we make the versioned symbol point to the normal one. */
1824 flip
->root
.type
= h
->root
.type
;
1825 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1826 h
->root
.type
= bfd_link_hash_indirect
;
1827 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1828 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1832 flip
->ref_dynamic
= 1;
1839 /* This function is called to create an indirect symbol from the
1840 default for the symbol with the default version if needed. The
1841 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1842 set DYNSYM if the new indirect symbol is dynamic. */
1845 _bfd_elf_add_default_symbol (bfd
*abfd
,
1846 struct bfd_link_info
*info
,
1847 struct elf_link_hash_entry
*h
,
1849 Elf_Internal_Sym
*sym
,
1853 bfd_boolean
*dynsym
)
1855 bfd_boolean type_change_ok
;
1856 bfd_boolean size_change_ok
;
1859 struct elf_link_hash_entry
*hi
;
1860 struct bfd_link_hash_entry
*bh
;
1861 const struct elf_backend_data
*bed
;
1862 bfd_boolean collect
;
1863 bfd_boolean dynamic
;
1866 size_t len
, shortlen
;
1868 bfd_boolean matched
;
1870 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1873 /* If this symbol has a version, and it is the default version, we
1874 create an indirect symbol from the default name to the fully
1875 decorated name. This will cause external references which do not
1876 specify a version to be bound to this version of the symbol. */
1877 p
= strchr (name
, ELF_VER_CHR
);
1878 if (h
->versioned
== unknown
)
1882 h
->versioned
= unversioned
;
1887 if (p
[1] != ELF_VER_CHR
)
1889 h
->versioned
= versioned_hidden
;
1893 h
->versioned
= versioned
;
1898 /* PR ld/19073: We may see an unversioned definition after the
1904 bed
= get_elf_backend_data (abfd
);
1905 collect
= bed
->collect
;
1906 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1908 shortlen
= p
- name
;
1909 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1910 if (shortname
== NULL
)
1912 memcpy (shortname
, name
, shortlen
);
1913 shortname
[shortlen
] = '\0';
1915 /* We are going to create a new symbol. Merge it with any existing
1916 symbol with this name. For the purposes of the merge, act as
1917 though we were defining the symbol we just defined, although we
1918 actually going to define an indirect symbol. */
1919 type_change_ok
= FALSE
;
1920 size_change_ok
= FALSE
;
1923 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1924 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1925 &type_change_ok
, &size_change_ok
, &matched
))
1931 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1933 /* If the undecorated symbol will have a version added by a
1934 script different to H, then don't indirect to/from the
1935 undecorated symbol. This isn't ideal because we may not yet
1936 have seen symbol versions, if given by a script on the
1937 command line rather than via --version-script. */
1938 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1943 = bfd_find_version_for_sym (info
->version_info
,
1944 hi
->root
.root
.string
, &hide
);
1945 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1947 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
1951 if (hi
->verinfo
.vertree
!= NULL
1952 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1958 /* Add the default symbol if not performing a relocatable link. */
1959 if (! bfd_link_relocatable (info
))
1962 if (bh
->type
== bfd_link_hash_defined
1963 && bh
->u
.def
.section
->owner
!= NULL
1964 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1966 /* Mark the previous definition from IR object as
1967 undefined so that the generic linker will override
1969 bh
->type
= bfd_link_hash_undefined
;
1970 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1972 if (! (_bfd_generic_link_add_one_symbol
1973 (info
, abfd
, shortname
, BSF_INDIRECT
,
1974 bfd_ind_section_ptr
,
1975 0, name
, FALSE
, collect
, &bh
)))
1977 hi
= (struct elf_link_hash_entry
*) bh
;
1982 /* In this case the symbol named SHORTNAME is overriding the
1983 indirect symbol we want to add. We were planning on making
1984 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1985 is the name without a version. NAME is the fully versioned
1986 name, and it is the default version.
1988 Overriding means that we already saw a definition for the
1989 symbol SHORTNAME in a regular object, and it is overriding
1990 the symbol defined in the dynamic object.
1992 When this happens, we actually want to change NAME, the
1993 symbol we just added, to refer to SHORTNAME. This will cause
1994 references to NAME in the shared object to become references
1995 to SHORTNAME in the regular object. This is what we expect
1996 when we override a function in a shared object: that the
1997 references in the shared object will be mapped to the
1998 definition in the regular object. */
2000 while (hi
->root
.type
== bfd_link_hash_indirect
2001 || hi
->root
.type
== bfd_link_hash_warning
)
2002 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2004 h
->root
.type
= bfd_link_hash_indirect
;
2005 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
2009 hi
->ref_dynamic
= 1;
2013 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
2018 /* Now set HI to H, so that the following code will set the
2019 other fields correctly. */
2023 /* Check if HI is a warning symbol. */
2024 if (hi
->root
.type
== bfd_link_hash_warning
)
2025 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2027 /* If there is a duplicate definition somewhere, then HI may not
2028 point to an indirect symbol. We will have reported an error to
2029 the user in that case. */
2031 if (hi
->root
.type
== bfd_link_hash_indirect
)
2033 struct elf_link_hash_entry
*ht
;
2035 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2036 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2038 /* If we first saw a reference to SHORTNAME with non-default
2039 visibility, merge that visibility to the @@VER symbol. */
2040 elf_merge_st_other (abfd
, ht
, hi
->other
, sec
, TRUE
, dynamic
);
2042 /* A reference to the SHORTNAME symbol from a dynamic library
2043 will be satisfied by the versioned symbol at runtime. In
2044 effect, we have a reference to the versioned symbol. */
2045 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2046 hi
->dynamic_def
|= ht
->dynamic_def
;
2048 /* See if the new flags lead us to realize that the symbol must
2054 if (! bfd_link_executable (info
)
2061 if (hi
->ref_regular
)
2067 /* We also need to define an indirection from the nondefault version
2071 len
= strlen (name
);
2072 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2073 if (shortname
== NULL
)
2075 memcpy (shortname
, name
, shortlen
);
2076 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2078 /* Once again, merge with any existing symbol. */
2079 type_change_ok
= FALSE
;
2080 size_change_ok
= FALSE
;
2082 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2083 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2084 &type_change_ok
, &size_change_ok
, &matched
))
2090 && h
->root
.type
== bfd_link_hash_defweak
2091 && hi
->root
.type
== bfd_link_hash_defined
)
2093 /* We are handling a weak sym@@ver and attempting to define
2094 a weak sym@ver, but _bfd_elf_merge_symbol said to skip the
2095 new weak sym@ver because there is already a strong sym@ver.
2096 However, sym@ver and sym@@ver are really the same symbol.
2097 The existing strong sym@ver ought to override sym@@ver. */
2098 h
->root
.type
= bfd_link_hash_defined
;
2099 h
->root
.u
.def
.section
= hi
->root
.u
.def
.section
;
2100 h
->root
.u
.def
.value
= hi
->root
.u
.def
.value
;
2101 hi
->root
.type
= bfd_link_hash_indirect
;
2102 hi
->root
.u
.i
.link
= &h
->root
;
2109 /* Here SHORTNAME is a versioned name, so we don't expect to see
2110 the type of override we do in the case above unless it is
2111 overridden by a versioned definition. */
2112 if (hi
->root
.type
!= bfd_link_hash_defined
2113 && hi
->root
.type
!= bfd_link_hash_defweak
)
2115 /* xgettext:c-format */
2116 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2123 if (! (_bfd_generic_link_add_one_symbol
2124 (info
, abfd
, shortname
, BSF_INDIRECT
,
2125 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
2127 hi
= (struct elf_link_hash_entry
*) bh
;
2130 /* If there is a duplicate definition somewhere, then HI may not
2131 point to an indirect symbol. We will have reported an error
2132 to the user in that case. */
2133 if (hi
->root
.type
== bfd_link_hash_indirect
)
2135 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2136 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2137 hi
->dynamic_def
|= h
->dynamic_def
;
2139 /* If we first saw a reference to @VER symbol with
2140 non-default visibility, merge that visibility to the
2142 elf_merge_st_other (abfd
, h
, hi
->other
, sec
, TRUE
, dynamic
);
2144 /* See if the new flags lead us to realize that the symbol
2150 if (! bfd_link_executable (info
)
2156 if (hi
->ref_regular
)
2165 /* This routine is used to export all defined symbols into the dynamic
2166 symbol table. It is called via elf_link_hash_traverse. */
2169 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2171 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2173 /* Ignore indirect symbols. These are added by the versioning code. */
2174 if (h
->root
.type
== bfd_link_hash_indirect
)
2177 /* Ignore this if we won't export it. */
2178 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2181 if (h
->dynindx
== -1
2182 && (h
->def_regular
|| h
->ref_regular
)
2183 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2184 h
->root
.root
.string
))
2186 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2196 /* Look through the symbols which are defined in other shared
2197 libraries and referenced here. Update the list of version
2198 dependencies. This will be put into the .gnu.version_r section.
2199 This function is called via elf_link_hash_traverse. */
2202 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2205 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2206 Elf_Internal_Verneed
*t
;
2207 Elf_Internal_Vernaux
*a
;
2210 /* We only care about symbols defined in shared objects with version
2215 || h
->verinfo
.verdef
== NULL
2216 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2217 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2220 /* See if we already know about this version. */
2221 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2225 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2228 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2229 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2235 /* This is a new version. Add it to tree we are building. */
2240 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2243 rinfo
->failed
= TRUE
;
2247 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2248 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2249 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2253 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2256 rinfo
->failed
= TRUE
;
2260 /* Note that we are copying a string pointer here, and testing it
2261 above. If bfd_elf_string_from_elf_section is ever changed to
2262 discard the string data when low in memory, this will have to be
2264 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2266 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2267 a
->vna_nextptr
= t
->vn_auxptr
;
2269 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2272 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2279 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2280 hidden. Set *T_P to NULL if there is no match. */
2283 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2284 struct elf_link_hash_entry
*h
,
2285 const char *version_p
,
2286 struct bfd_elf_version_tree
**t_p
,
2289 struct bfd_elf_version_tree
*t
;
2291 /* Look for the version. If we find it, it is no longer weak. */
2292 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2294 if (strcmp (t
->name
, version_p
) == 0)
2298 struct bfd_elf_version_expr
*d
;
2300 len
= version_p
- h
->root
.root
.string
;
2301 alc
= (char *) bfd_malloc (len
);
2304 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2305 alc
[len
- 1] = '\0';
2306 if (alc
[len
- 2] == ELF_VER_CHR
)
2307 alc
[len
- 2] = '\0';
2309 h
->verinfo
.vertree
= t
;
2313 if (t
->globals
.list
!= NULL
)
2314 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2316 /* See if there is anything to force this symbol to
2318 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2320 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2323 && ! info
->export_dynamic
)
2337 /* Return TRUE if the symbol H is hidden by version script. */
2340 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2341 struct elf_link_hash_entry
*h
)
2344 bfd_boolean hide
= FALSE
;
2345 const struct elf_backend_data
*bed
2346 = get_elf_backend_data (info
->output_bfd
);
2348 /* Version script only hides symbols defined in regular objects. */
2349 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2352 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2353 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2355 struct bfd_elf_version_tree
*t
;
2358 if (*p
== ELF_VER_CHR
)
2362 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2366 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2371 /* If we don't have a version for this symbol, see if we can find
2373 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2376 = bfd_find_version_for_sym (info
->version_info
,
2377 h
->root
.root
.string
, &hide
);
2378 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2380 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2388 /* Figure out appropriate versions for all the symbols. We may not
2389 have the version number script until we have read all of the input
2390 files, so until that point we don't know which symbols should be
2391 local. This function is called via elf_link_hash_traverse. */
2394 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2396 struct elf_info_failed
*sinfo
;
2397 struct bfd_link_info
*info
;
2398 const struct elf_backend_data
*bed
;
2399 struct elf_info_failed eif
;
2403 sinfo
= (struct elf_info_failed
*) data
;
2406 /* Fix the symbol flags. */
2409 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2412 sinfo
->failed
= TRUE
;
2416 bed
= get_elf_backend_data (info
->output_bfd
);
2418 /* We only need version numbers for symbols defined in regular
2420 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2422 /* Hide symbols defined in discarded input sections. */
2423 if ((h
->root
.type
== bfd_link_hash_defined
2424 || h
->root
.type
== bfd_link_hash_defweak
)
2425 && discarded_section (h
->root
.u
.def
.section
))
2426 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2431 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2432 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2434 struct bfd_elf_version_tree
*t
;
2437 if (*p
== ELF_VER_CHR
)
2440 /* If there is no version string, we can just return out. */
2444 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2446 sinfo
->failed
= TRUE
;
2451 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2453 /* If we are building an application, we need to create a
2454 version node for this version. */
2455 if (t
== NULL
&& bfd_link_executable (info
))
2457 struct bfd_elf_version_tree
**pp
;
2460 /* If we aren't going to export this symbol, we don't need
2461 to worry about it. */
2462 if (h
->dynindx
== -1)
2465 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2469 sinfo
->failed
= TRUE
;
2474 t
->name_indx
= (unsigned int) -1;
2478 /* Don't count anonymous version tag. */
2479 if (sinfo
->info
->version_info
!= NULL
2480 && sinfo
->info
->version_info
->vernum
== 0)
2482 for (pp
= &sinfo
->info
->version_info
;
2486 t
->vernum
= version_index
;
2490 h
->verinfo
.vertree
= t
;
2494 /* We could not find the version for a symbol when
2495 generating a shared archive. Return an error. */
2497 /* xgettext:c-format */
2498 (_("%pB: version node not found for symbol %s"),
2499 info
->output_bfd
, h
->root
.root
.string
);
2500 bfd_set_error (bfd_error_bad_value
);
2501 sinfo
->failed
= TRUE
;
2506 /* If we don't have a version for this symbol, see if we can find
2509 && h
->verinfo
.vertree
== NULL
2510 && sinfo
->info
->version_info
!= NULL
)
2513 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2514 h
->root
.root
.string
, &hide
);
2515 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2516 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2522 /* Read and swap the relocs from the section indicated by SHDR. This
2523 may be either a REL or a RELA section. The relocations are
2524 translated into RELA relocations and stored in INTERNAL_RELOCS,
2525 which should have already been allocated to contain enough space.
2526 The EXTERNAL_RELOCS are a buffer where the external form of the
2527 relocations should be stored.
2529 Returns FALSE if something goes wrong. */
2532 elf_link_read_relocs_from_section (bfd
*abfd
,
2534 Elf_Internal_Shdr
*shdr
,
2535 void *external_relocs
,
2536 Elf_Internal_Rela
*internal_relocs
)
2538 const struct elf_backend_data
*bed
;
2539 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2540 const bfd_byte
*erela
;
2541 const bfd_byte
*erelaend
;
2542 Elf_Internal_Rela
*irela
;
2543 Elf_Internal_Shdr
*symtab_hdr
;
2546 /* Position ourselves at the start of the section. */
2547 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2550 /* Read the relocations. */
2551 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2554 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2555 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2557 bed
= get_elf_backend_data (abfd
);
2559 /* Convert the external relocations to the internal format. */
2560 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2561 swap_in
= bed
->s
->swap_reloc_in
;
2562 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2563 swap_in
= bed
->s
->swap_reloca_in
;
2566 bfd_set_error (bfd_error_wrong_format
);
2570 erela
= (const bfd_byte
*) external_relocs
;
2571 /* Setting erelaend like this and comparing with <= handles case of
2572 a fuzzed object with sh_size not a multiple of sh_entsize. */
2573 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2574 irela
= internal_relocs
;
2575 while (erela
<= erelaend
)
2579 (*swap_in
) (abfd
, erela
, irela
);
2580 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2581 if (bed
->s
->arch_size
== 64)
2585 if ((size_t) r_symndx
>= nsyms
)
2588 /* xgettext:c-format */
2589 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2590 " for offset %#" PRIx64
" in section `%pA'"),
2591 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2592 (uint64_t) irela
->r_offset
, sec
);
2593 bfd_set_error (bfd_error_bad_value
);
2597 else if (r_symndx
!= STN_UNDEF
)
2600 /* xgettext:c-format */
2601 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2602 " for offset %#" PRIx64
" in section `%pA'"
2603 " when the object file has no symbol table"),
2604 abfd
, (uint64_t) r_symndx
,
2605 (uint64_t) irela
->r_offset
, sec
);
2606 bfd_set_error (bfd_error_bad_value
);
2609 irela
+= bed
->s
->int_rels_per_ext_rel
;
2610 erela
+= shdr
->sh_entsize
;
2616 /* Read and swap the relocs for a section O. They may have been
2617 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2618 not NULL, they are used as buffers to read into. They are known to
2619 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2620 the return value is allocated using either malloc or bfd_alloc,
2621 according to the KEEP_MEMORY argument. If O has two relocation
2622 sections (both REL and RELA relocations), then the REL_HDR
2623 relocations will appear first in INTERNAL_RELOCS, followed by the
2624 RELA_HDR relocations. */
2627 _bfd_elf_link_read_relocs (bfd
*abfd
,
2629 void *external_relocs
,
2630 Elf_Internal_Rela
*internal_relocs
,
2631 bfd_boolean keep_memory
)
2633 void *alloc1
= NULL
;
2634 Elf_Internal_Rela
*alloc2
= NULL
;
2635 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2636 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2637 Elf_Internal_Rela
*internal_rela_relocs
;
2639 if (esdo
->relocs
!= NULL
)
2640 return esdo
->relocs
;
2642 if (o
->reloc_count
== 0)
2645 if (internal_relocs
== NULL
)
2649 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2651 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2653 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2654 if (internal_relocs
== NULL
)
2658 if (external_relocs
== NULL
)
2660 bfd_size_type size
= 0;
2663 size
+= esdo
->rel
.hdr
->sh_size
;
2665 size
+= esdo
->rela
.hdr
->sh_size
;
2667 alloc1
= bfd_malloc (size
);
2670 external_relocs
= alloc1
;
2673 internal_rela_relocs
= internal_relocs
;
2676 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2680 external_relocs
= (((bfd_byte
*) external_relocs
)
2681 + esdo
->rel
.hdr
->sh_size
);
2682 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2683 * bed
->s
->int_rels_per_ext_rel
);
2687 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2689 internal_rela_relocs
)))
2692 /* Cache the results for next time, if we can. */
2694 esdo
->relocs
= internal_relocs
;
2698 /* Don't free alloc2, since if it was allocated we are passing it
2699 back (under the name of internal_relocs). */
2701 return internal_relocs
;
2708 bfd_release (abfd
, alloc2
);
2715 /* Compute the size of, and allocate space for, REL_HDR which is the
2716 section header for a section containing relocations for O. */
2719 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2720 struct bfd_elf_section_reloc_data
*reldata
)
2722 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2724 /* That allows us to calculate the size of the section. */
2725 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2727 /* The contents field must last into write_object_contents, so we
2728 allocate it with bfd_alloc rather than malloc. Also since we
2729 cannot be sure that the contents will actually be filled in,
2730 we zero the allocated space. */
2731 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2732 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2735 if (reldata
->hashes
== NULL
&& reldata
->count
)
2737 struct elf_link_hash_entry
**p
;
2739 p
= ((struct elf_link_hash_entry
**)
2740 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2744 reldata
->hashes
= p
;
2750 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2751 originated from the section given by INPUT_REL_HDR) to the
2755 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2756 asection
*input_section
,
2757 Elf_Internal_Shdr
*input_rel_hdr
,
2758 Elf_Internal_Rela
*internal_relocs
,
2759 struct elf_link_hash_entry
**rel_hash
2762 Elf_Internal_Rela
*irela
;
2763 Elf_Internal_Rela
*irelaend
;
2765 struct bfd_elf_section_reloc_data
*output_reldata
;
2766 asection
*output_section
;
2767 const struct elf_backend_data
*bed
;
2768 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2769 struct bfd_elf_section_data
*esdo
;
2771 output_section
= input_section
->output_section
;
2773 bed
= get_elf_backend_data (output_bfd
);
2774 esdo
= elf_section_data (output_section
);
2775 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2777 output_reldata
= &esdo
->rel
;
2778 swap_out
= bed
->s
->swap_reloc_out
;
2780 else if (esdo
->rela
.hdr
2781 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2783 output_reldata
= &esdo
->rela
;
2784 swap_out
= bed
->s
->swap_reloca_out
;
2789 /* xgettext:c-format */
2790 (_("%pB: relocation size mismatch in %pB section %pA"),
2791 output_bfd
, input_section
->owner
, input_section
);
2792 bfd_set_error (bfd_error_wrong_format
);
2796 erel
= output_reldata
->hdr
->contents
;
2797 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2798 irela
= internal_relocs
;
2799 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2800 * bed
->s
->int_rels_per_ext_rel
);
2801 while (irela
< irelaend
)
2803 (*swap_out
) (output_bfd
, irela
, erel
);
2804 irela
+= bed
->s
->int_rels_per_ext_rel
;
2805 erel
+= input_rel_hdr
->sh_entsize
;
2808 /* Bump the counter, so that we know where to add the next set of
2810 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2815 /* Make weak undefined symbols in PIE dynamic. */
2818 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2819 struct elf_link_hash_entry
*h
)
2821 if (bfd_link_pie (info
)
2823 && h
->root
.type
== bfd_link_hash_undefweak
)
2824 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2829 /* Fix up the flags for a symbol. This handles various cases which
2830 can only be fixed after all the input files are seen. This is
2831 currently called by both adjust_dynamic_symbol and
2832 assign_sym_version, which is unnecessary but perhaps more robust in
2833 the face of future changes. */
2836 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2837 struct elf_info_failed
*eif
)
2839 const struct elf_backend_data
*bed
;
2841 /* If this symbol was mentioned in a non-ELF file, try to set
2842 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2843 permit a non-ELF file to correctly refer to a symbol defined in
2844 an ELF dynamic object. */
2847 while (h
->root
.type
== bfd_link_hash_indirect
)
2848 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2850 if (h
->root
.type
!= bfd_link_hash_defined
2851 && h
->root
.type
!= bfd_link_hash_defweak
)
2854 h
->ref_regular_nonweak
= 1;
2858 if (h
->root
.u
.def
.section
->owner
!= NULL
2859 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2860 == bfd_target_elf_flavour
))
2863 h
->ref_regular_nonweak
= 1;
2869 if (h
->dynindx
== -1
2873 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2882 /* Unfortunately, NON_ELF is only correct if the symbol
2883 was first seen in a non-ELF file. Fortunately, if the symbol
2884 was first seen in an ELF file, we're probably OK unless the
2885 symbol was defined in a non-ELF file. Catch that case here.
2886 FIXME: We're still in trouble if the symbol was first seen in
2887 a dynamic object, and then later in a non-ELF regular object. */
2888 if ((h
->root
.type
== bfd_link_hash_defined
2889 || h
->root
.type
== bfd_link_hash_defweak
)
2891 && (h
->root
.u
.def
.section
->owner
!= NULL
2892 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2893 != bfd_target_elf_flavour
)
2894 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2895 && !h
->def_dynamic
)))
2899 /* Backend specific symbol fixup. */
2900 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2901 if (bed
->elf_backend_fixup_symbol
2902 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2905 /* If this is a final link, and the symbol was defined as a common
2906 symbol in a regular object file, and there was no definition in
2907 any dynamic object, then the linker will have allocated space for
2908 the symbol in a common section but the DEF_REGULAR
2909 flag will not have been set. */
2910 if (h
->root
.type
== bfd_link_hash_defined
2914 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2917 /* Symbols defined in discarded sections shouldn't be dynamic. */
2918 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2919 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2921 /* If a weak undefined symbol has non-default visibility, we also
2922 hide it from the dynamic linker. */
2923 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2924 && h
->root
.type
== bfd_link_hash_undefweak
)
2925 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2927 /* A hidden versioned symbol in executable should be forced local if
2928 it is is locally defined, not referenced by shared library and not
2930 else if (bfd_link_executable (eif
->info
)
2931 && h
->versioned
== versioned_hidden
2932 && !eif
->info
->export_dynamic
2936 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2938 /* If -Bsymbolic was used (which means to bind references to global
2939 symbols to the definition within the shared object), and this
2940 symbol was defined in a regular object, then it actually doesn't
2941 need a PLT entry. Likewise, if the symbol has non-default
2942 visibility. If the symbol has hidden or internal visibility, we
2943 will force it local. */
2944 else if (h
->needs_plt
2945 && bfd_link_pic (eif
->info
)
2946 && is_elf_hash_table (eif
->info
->hash
)
2947 && (SYMBOLIC_BIND (eif
->info
, h
)
2948 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2951 bfd_boolean force_local
;
2953 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2954 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2955 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2958 /* If this is a weak defined symbol in a dynamic object, and we know
2959 the real definition in the dynamic object, copy interesting flags
2960 over to the real definition. */
2961 if (h
->is_weakalias
)
2963 struct elf_link_hash_entry
*def
= weakdef (h
);
2965 /* If the real definition is defined by a regular object file,
2966 don't do anything special. See the longer description in
2967 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2968 bfd_link_hash_defined as it was when put on the alias list
2969 then it must have originally been a versioned symbol (for
2970 which a non-versioned indirect symbol is created) and later
2971 a definition for the non-versioned symbol is found. In that
2972 case the indirection is flipped with the versioned symbol
2973 becoming an indirect pointing at the non-versioned symbol.
2974 Thus, not an alias any more. */
2975 if (def
->def_regular
2976 || def
->root
.type
!= bfd_link_hash_defined
)
2979 while ((h
= h
->u
.alias
) != def
)
2980 h
->is_weakalias
= 0;
2984 while (h
->root
.type
== bfd_link_hash_indirect
)
2985 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2986 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2987 || h
->root
.type
== bfd_link_hash_defweak
);
2988 BFD_ASSERT (def
->def_dynamic
);
2989 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2996 /* Make the backend pick a good value for a dynamic symbol. This is
2997 called via elf_link_hash_traverse, and also calls itself
3001 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
3003 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3004 struct elf_link_hash_table
*htab
;
3005 const struct elf_backend_data
*bed
;
3007 if (! is_elf_hash_table (eif
->info
->hash
))
3010 /* Ignore indirect symbols. These are added by the versioning code. */
3011 if (h
->root
.type
== bfd_link_hash_indirect
)
3014 /* Fix the symbol flags. */
3015 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
3018 htab
= elf_hash_table (eif
->info
);
3019 bed
= get_elf_backend_data (htab
->dynobj
);
3021 if (h
->root
.type
== bfd_link_hash_undefweak
)
3023 if (eif
->info
->dynamic_undefined_weak
== 0)
3024 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
3025 else if (eif
->info
->dynamic_undefined_weak
> 0
3027 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3028 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
3029 h
->root
.root
.string
))
3031 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3039 /* If this symbol does not require a PLT entry, and it is not
3040 defined by a dynamic object, or is not referenced by a regular
3041 object, ignore it. We do have to handle a weak defined symbol,
3042 even if no regular object refers to it, if we decided to add it
3043 to the dynamic symbol table. FIXME: Do we normally need to worry
3044 about symbols which are defined by one dynamic object and
3045 referenced by another one? */
3047 && h
->type
!= STT_GNU_IFUNC
3051 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3053 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3057 /* If we've already adjusted this symbol, don't do it again. This
3058 can happen via a recursive call. */
3059 if (h
->dynamic_adjusted
)
3062 /* Don't look at this symbol again. Note that we must set this
3063 after checking the above conditions, because we may look at a
3064 symbol once, decide not to do anything, and then get called
3065 recursively later after REF_REGULAR is set below. */
3066 h
->dynamic_adjusted
= 1;
3068 /* If this is a weak definition, and we know a real definition, and
3069 the real symbol is not itself defined by a regular object file,
3070 then get a good value for the real definition. We handle the
3071 real symbol first, for the convenience of the backend routine.
3073 Note that there is a confusing case here. If the real definition
3074 is defined by a regular object file, we don't get the real symbol
3075 from the dynamic object, but we do get the weak symbol. If the
3076 processor backend uses a COPY reloc, then if some routine in the
3077 dynamic object changes the real symbol, we will not see that
3078 change in the corresponding weak symbol. This is the way other
3079 ELF linkers work as well, and seems to be a result of the shared
3082 I will clarify this issue. Most SVR4 shared libraries define the
3083 variable _timezone and define timezone as a weak synonym. The
3084 tzset call changes _timezone. If you write
3085 extern int timezone;
3087 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3088 you might expect that, since timezone is a synonym for _timezone,
3089 the same number will print both times. However, if the processor
3090 backend uses a COPY reloc, then actually timezone will be copied
3091 into your process image, and, since you define _timezone
3092 yourself, _timezone will not. Thus timezone and _timezone will
3093 wind up at different memory locations. The tzset call will set
3094 _timezone, leaving timezone unchanged. */
3096 if (h
->is_weakalias
)
3098 struct elf_link_hash_entry
*def
= weakdef (h
);
3100 /* If we get to this point, there is an implicit reference to
3101 the alias by a regular object file via the weak symbol H. */
3102 def
->ref_regular
= 1;
3104 /* Ensure that the backend adjust_dynamic_symbol function sees
3105 the strong alias before H by recursively calling ourselves. */
3106 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3110 /* If a symbol has no type and no size and does not require a PLT
3111 entry, then we are probably about to do the wrong thing here: we
3112 are probably going to create a COPY reloc for an empty object.
3113 This case can arise when a shared object is built with assembly
3114 code, and the assembly code fails to set the symbol type. */
3116 && h
->type
== STT_NOTYPE
3119 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3120 h
->root
.root
.string
);
3122 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3131 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3135 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3136 struct elf_link_hash_entry
*h
,
3139 unsigned int power_of_two
;
3141 asection
*sec
= h
->root
.u
.def
.section
;
3143 /* The section alignment of the definition is the maximum alignment
3144 requirement of symbols defined in the section. Since we don't
3145 know the symbol alignment requirement, we start with the
3146 maximum alignment and check low bits of the symbol address
3147 for the minimum alignment. */
3148 power_of_two
= bfd_section_alignment (sec
);
3149 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3150 while ((h
->root
.u
.def
.value
& mask
) != 0)
3156 if (power_of_two
> bfd_section_alignment (dynbss
))
3158 /* Adjust the section alignment if needed. */
3159 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3163 /* We make sure that the symbol will be aligned properly. */
3164 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3166 /* Define the symbol as being at this point in DYNBSS. */
3167 h
->root
.u
.def
.section
= dynbss
;
3168 h
->root
.u
.def
.value
= dynbss
->size
;
3170 /* Increment the size of DYNBSS to make room for the symbol. */
3171 dynbss
->size
+= h
->size
;
3173 /* No error if extern_protected_data is true. */
3174 if (h
->protected_def
3175 && (!info
->extern_protected_data
3176 || (info
->extern_protected_data
< 0
3177 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3178 info
->callbacks
->einfo
3179 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3180 h
->root
.root
.string
);
3185 /* Adjust all external symbols pointing into SEC_MERGE sections
3186 to reflect the object merging within the sections. */
3189 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3193 if ((h
->root
.type
== bfd_link_hash_defined
3194 || h
->root
.type
== bfd_link_hash_defweak
)
3195 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3196 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3198 bfd
*output_bfd
= (bfd
*) data
;
3200 h
->root
.u
.def
.value
=
3201 _bfd_merged_section_offset (output_bfd
,
3202 &h
->root
.u
.def
.section
,
3203 elf_section_data (sec
)->sec_info
,
3204 h
->root
.u
.def
.value
);
3210 /* Returns false if the symbol referred to by H should be considered
3211 to resolve local to the current module, and true if it should be
3212 considered to bind dynamically. */
3215 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3216 struct bfd_link_info
*info
,
3217 bfd_boolean not_local_protected
)
3219 bfd_boolean binding_stays_local_p
;
3220 const struct elf_backend_data
*bed
;
3221 struct elf_link_hash_table
*hash_table
;
3226 while (h
->root
.type
== bfd_link_hash_indirect
3227 || h
->root
.type
== bfd_link_hash_warning
)
3228 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3230 /* If it was forced local, then clearly it's not dynamic. */
3231 if (h
->dynindx
== -1)
3233 if (h
->forced_local
)
3236 /* Identify the cases where name binding rules say that a
3237 visible symbol resolves locally. */
3238 binding_stays_local_p
= (bfd_link_executable (info
)
3239 || SYMBOLIC_BIND (info
, h
));
3241 switch (ELF_ST_VISIBILITY (h
->other
))
3248 hash_table
= elf_hash_table (info
);
3249 if (!is_elf_hash_table (hash_table
))
3252 bed
= get_elf_backend_data (hash_table
->dynobj
);
3254 /* Proper resolution for function pointer equality may require
3255 that these symbols perhaps be resolved dynamically, even though
3256 we should be resolving them to the current module. */
3257 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3258 binding_stays_local_p
= TRUE
;
3265 /* If it isn't defined locally, then clearly it's dynamic. */
3266 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3269 /* Otherwise, the symbol is dynamic if binding rules don't tell
3270 us that it remains local. */
3271 return !binding_stays_local_p
;
3274 /* Return true if the symbol referred to by H should be considered
3275 to resolve local to the current module, and false otherwise. Differs
3276 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3277 undefined symbols. The two functions are virtually identical except
3278 for the place where dynindx == -1 is tested. If that test is true,
3279 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3280 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3282 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3283 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3284 treatment of undefined weak symbols. For those that do not make
3285 undefined weak symbols dynamic, both functions may return false. */
3288 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3289 struct bfd_link_info
*info
,
3290 bfd_boolean local_protected
)
3292 const struct elf_backend_data
*bed
;
3293 struct elf_link_hash_table
*hash_table
;
3295 /* If it's a local sym, of course we resolve locally. */
3299 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3300 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3301 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3304 /* Forced local symbols resolve locally. */
3305 if (h
->forced_local
)
3308 /* Common symbols that become definitions don't get the DEF_REGULAR
3309 flag set, so test it first, and don't bail out. */
3310 if (ELF_COMMON_DEF_P (h
))
3312 /* If we don't have a definition in a regular file, then we can't
3313 resolve locally. The sym is either undefined or dynamic. */
3314 else if (!h
->def_regular
)
3317 /* Non-dynamic symbols resolve locally. */
3318 if (h
->dynindx
== -1)
3321 /* At this point, we know the symbol is defined and dynamic. In an
3322 executable it must resolve locally, likewise when building symbolic
3323 shared libraries. */
3324 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3327 /* Now deal with defined dynamic symbols in shared libraries. Ones
3328 with default visibility might not resolve locally. */
3329 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3332 hash_table
= elf_hash_table (info
);
3333 if (!is_elf_hash_table (hash_table
))
3336 bed
= get_elf_backend_data (hash_table
->dynobj
);
3338 /* If extern_protected_data is false, STV_PROTECTED non-function
3339 symbols are local. */
3340 if ((!info
->extern_protected_data
3341 || (info
->extern_protected_data
< 0
3342 && !bed
->extern_protected_data
))
3343 && !bed
->is_function_type (h
->type
))
3346 /* Function pointer equality tests may require that STV_PROTECTED
3347 symbols be treated as dynamic symbols. If the address of a
3348 function not defined in an executable is set to that function's
3349 plt entry in the executable, then the address of the function in
3350 a shared library must also be the plt entry in the executable. */
3351 return local_protected
;
3354 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3355 aligned. Returns the first TLS output section. */
3357 struct bfd_section
*
3358 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3360 struct bfd_section
*sec
, *tls
;
3361 unsigned int align
= 0;
3363 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3364 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3368 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3369 if (sec
->alignment_power
> align
)
3370 align
= sec
->alignment_power
;
3372 elf_hash_table (info
)->tls_sec
= tls
;
3374 /* Ensure the alignment of the first section (usually .tdata) is the largest
3375 alignment, so that the tls segment starts aligned. */
3377 tls
->alignment_power
= align
;
3382 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3384 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3385 Elf_Internal_Sym
*sym
)
3387 const struct elf_backend_data
*bed
;
3389 /* Local symbols do not count, but target specific ones might. */
3390 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3391 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3394 bed
= get_elf_backend_data (abfd
);
3395 /* Function symbols do not count. */
3396 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3399 /* If the section is undefined, then so is the symbol. */
3400 if (sym
->st_shndx
== SHN_UNDEF
)
3403 /* If the symbol is defined in the common section, then
3404 it is a common definition and so does not count. */
3405 if (bed
->common_definition (sym
))
3408 /* If the symbol is in a target specific section then we
3409 must rely upon the backend to tell us what it is. */
3410 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3411 /* FIXME - this function is not coded yet:
3413 return _bfd_is_global_symbol_definition (abfd, sym);
3415 Instead for now assume that the definition is not global,
3416 Even if this is wrong, at least the linker will behave
3417 in the same way that it used to do. */
3423 /* Search the symbol table of the archive element of the archive ABFD
3424 whose archive map contains a mention of SYMDEF, and determine if
3425 the symbol is defined in this element. */
3427 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3429 Elf_Internal_Shdr
* hdr
;
3433 Elf_Internal_Sym
*isymbuf
;
3434 Elf_Internal_Sym
*isym
;
3435 Elf_Internal_Sym
*isymend
;
3438 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3442 if (! bfd_check_format (abfd
, bfd_object
))
3445 /* Select the appropriate symbol table. If we don't know if the
3446 object file is an IR object, give linker LTO plugin a chance to
3447 get the correct symbol table. */
3448 if (abfd
->plugin_format
== bfd_plugin_yes
3449 #if BFD_SUPPORTS_PLUGINS
3450 || (abfd
->plugin_format
== bfd_plugin_unknown
3451 && bfd_link_plugin_object_p (abfd
))
3455 /* Use the IR symbol table if the object has been claimed by
3457 abfd
= abfd
->plugin_dummy_bfd
;
3458 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3460 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3461 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3463 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3465 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3467 /* The sh_info field of the symtab header tells us where the
3468 external symbols start. We don't care about the local symbols. */
3469 if (elf_bad_symtab (abfd
))
3471 extsymcount
= symcount
;
3476 extsymcount
= symcount
- hdr
->sh_info
;
3477 extsymoff
= hdr
->sh_info
;
3480 if (extsymcount
== 0)
3483 /* Read in the symbol table. */
3484 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3486 if (isymbuf
== NULL
)
3489 /* Scan the symbol table looking for SYMDEF. */
3491 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3495 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3500 if (strcmp (name
, symdef
->name
) == 0)
3502 result
= is_global_data_symbol_definition (abfd
, isym
);
3512 /* Add an entry to the .dynamic table. */
3515 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3519 struct elf_link_hash_table
*hash_table
;
3520 const struct elf_backend_data
*bed
;
3522 bfd_size_type newsize
;
3523 bfd_byte
*newcontents
;
3524 Elf_Internal_Dyn dyn
;
3526 hash_table
= elf_hash_table (info
);
3527 if (! is_elf_hash_table (hash_table
))
3530 if (tag
== DT_RELA
|| tag
== DT_REL
)
3531 hash_table
->dynamic_relocs
= TRUE
;
3533 bed
= get_elf_backend_data (hash_table
->dynobj
);
3534 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3535 BFD_ASSERT (s
!= NULL
);
3537 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3538 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3539 if (newcontents
== NULL
)
3543 dyn
.d_un
.d_val
= val
;
3544 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3547 s
->contents
= newcontents
;
3552 /* Strip zero-sized dynamic sections. */
3555 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3557 struct elf_link_hash_table
*hash_table
;
3558 const struct elf_backend_data
*bed
;
3559 asection
*s
, *sdynamic
, **pp
;
3560 asection
*rela_dyn
, *rel_dyn
;
3561 Elf_Internal_Dyn dyn
;
3562 bfd_byte
*extdyn
, *next
;
3563 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3564 bfd_boolean strip_zero_sized
;
3565 bfd_boolean strip_zero_sized_plt
;
3567 if (bfd_link_relocatable (info
))
3570 hash_table
= elf_hash_table (info
);
3571 if (!is_elf_hash_table (hash_table
))
3574 if (!hash_table
->dynobj
)
3577 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3581 bed
= get_elf_backend_data (hash_table
->dynobj
);
3582 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3584 strip_zero_sized
= FALSE
;
3585 strip_zero_sized_plt
= FALSE
;
3587 /* Strip zero-sized dynamic sections. */
3588 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3589 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3590 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3594 || s
== hash_table
->srelplt
->output_section
3595 || s
== hash_table
->splt
->output_section
))
3598 info
->output_bfd
->section_count
--;
3599 strip_zero_sized
= TRUE
;
3604 else if (s
== hash_table
->splt
->output_section
)
3606 s
= hash_table
->splt
;
3607 strip_zero_sized_plt
= TRUE
;
3610 s
= hash_table
->srelplt
;
3611 s
->flags
|= SEC_EXCLUDE
;
3612 s
->output_section
= bfd_abs_section_ptr
;
3617 if (strip_zero_sized_plt
)
3618 for (extdyn
= sdynamic
->contents
;
3619 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3622 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3623 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3631 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3632 the procedure linkage table (the .plt section) has been
3634 memmove (extdyn
, next
,
3635 sdynamic
->size
- (next
- sdynamic
->contents
));
3640 if (strip_zero_sized
)
3642 /* Regenerate program headers. */
3643 elf_seg_map (info
->output_bfd
) = NULL
;
3644 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
);
3650 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3651 1 if a DT_NEEDED tag already exists, and 0 on success. */
3654 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3656 struct elf_link_hash_table
*hash_table
;
3660 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3663 hash_table
= elf_hash_table (info
);
3664 soname
= elf_dt_name (abfd
);
3665 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3666 if (strindex
== (size_t) -1)
3669 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3672 const struct elf_backend_data
*bed
;
3675 bed
= get_elf_backend_data (hash_table
->dynobj
);
3676 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3678 for (extdyn
= sdyn
->contents
;
3679 extdyn
< sdyn
->contents
+ sdyn
->size
;
3680 extdyn
+= bed
->s
->sizeof_dyn
)
3682 Elf_Internal_Dyn dyn
;
3684 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3685 if (dyn
.d_tag
== DT_NEEDED
3686 && dyn
.d_un
.d_val
== strindex
)
3688 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3694 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3697 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3703 /* Return true if SONAME is on the needed list between NEEDED and STOP
3704 (or the end of list if STOP is NULL), and needed by a library that
3708 on_needed_list (const char *soname
,
3709 struct bfd_link_needed_list
*needed
,
3710 struct bfd_link_needed_list
*stop
)
3712 struct bfd_link_needed_list
*look
;
3713 for (look
= needed
; look
!= stop
; look
= look
->next
)
3714 if (strcmp (soname
, look
->name
) == 0
3715 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3716 /* If needed by a library that itself is not directly
3717 needed, recursively check whether that library is
3718 indirectly needed. Since we add DT_NEEDED entries to
3719 the end of the list, library dependencies appear after
3720 the library. Therefore search prior to the current
3721 LOOK, preventing possible infinite recursion. */
3722 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3728 /* Sort symbol by value, section, size, and type. */
3730 elf_sort_symbol (const void *arg1
, const void *arg2
)
3732 const struct elf_link_hash_entry
*h1
;
3733 const struct elf_link_hash_entry
*h2
;
3734 bfd_signed_vma vdiff
;
3739 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3740 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3741 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3743 return vdiff
> 0 ? 1 : -1;
3745 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3749 /* Sort so that sized symbols are selected over zero size symbols. */
3750 vdiff
= h1
->size
- h2
->size
;
3752 return vdiff
> 0 ? 1 : -1;
3754 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3755 if (h1
->type
!= h2
->type
)
3756 return h1
->type
- h2
->type
;
3758 /* If symbols are properly sized and typed, and multiple strong
3759 aliases are not defined in a shared library by the user we
3760 shouldn't get here. Unfortunately linker script symbols like
3761 __bss_start sometimes match a user symbol defined at the start of
3762 .bss without proper size and type. We'd like to preference the
3763 user symbol over reserved system symbols. Sort on leading
3765 n1
= h1
->root
.root
.string
;
3766 n2
= h2
->root
.root
.string
;
3779 /* Final sort on name selects user symbols like '_u' over reserved
3780 system symbols like '_Z' and also will avoid qsort instability. */
3784 /* This function is used to adjust offsets into .dynstr for
3785 dynamic symbols. This is called via elf_link_hash_traverse. */
3788 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3790 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3792 if (h
->dynindx
!= -1)
3793 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3797 /* Assign string offsets in .dynstr, update all structures referencing
3801 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3803 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3804 struct elf_link_local_dynamic_entry
*entry
;
3805 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3806 bfd
*dynobj
= hash_table
->dynobj
;
3809 const struct elf_backend_data
*bed
;
3812 _bfd_elf_strtab_finalize (dynstr
);
3813 size
= _bfd_elf_strtab_size (dynstr
);
3815 /* Allow the linker to examine the dynsymtab now it's fully populated. */
3817 if (info
->callbacks
->examine_strtab
)
3818 info
->callbacks
->examine_strtab (dynstr
);
3820 bed
= get_elf_backend_data (dynobj
);
3821 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3822 BFD_ASSERT (sdyn
!= NULL
);
3824 /* Update all .dynamic entries referencing .dynstr strings. */
3825 for (extdyn
= sdyn
->contents
;
3826 extdyn
< sdyn
->contents
+ sdyn
->size
;
3827 extdyn
+= bed
->s
->sizeof_dyn
)
3829 Elf_Internal_Dyn dyn
;
3831 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3835 dyn
.d_un
.d_val
= size
;
3845 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3850 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3853 /* Now update local dynamic symbols. */
3854 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3855 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3856 entry
->isym
.st_name
);
3858 /* And the rest of dynamic symbols. */
3859 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3861 /* Adjust version definitions. */
3862 if (elf_tdata (output_bfd
)->cverdefs
)
3867 Elf_Internal_Verdef def
;
3868 Elf_Internal_Verdaux defaux
;
3870 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3874 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3876 p
+= sizeof (Elf_External_Verdef
);
3877 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3879 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3881 _bfd_elf_swap_verdaux_in (output_bfd
,
3882 (Elf_External_Verdaux
*) p
, &defaux
);
3883 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3885 _bfd_elf_swap_verdaux_out (output_bfd
,
3886 &defaux
, (Elf_External_Verdaux
*) p
);
3887 p
+= sizeof (Elf_External_Verdaux
);
3890 while (def
.vd_next
);
3893 /* Adjust version references. */
3894 if (elf_tdata (output_bfd
)->verref
)
3899 Elf_Internal_Verneed need
;
3900 Elf_Internal_Vernaux needaux
;
3902 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3906 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3908 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3909 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3910 (Elf_External_Verneed
*) p
);
3911 p
+= sizeof (Elf_External_Verneed
);
3912 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3914 _bfd_elf_swap_vernaux_in (output_bfd
,
3915 (Elf_External_Vernaux
*) p
, &needaux
);
3916 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3918 _bfd_elf_swap_vernaux_out (output_bfd
,
3920 (Elf_External_Vernaux
*) p
);
3921 p
+= sizeof (Elf_External_Vernaux
);
3924 while (need
.vn_next
);
3930 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3931 The default is to only match when the INPUT and OUTPUT are exactly
3935 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3936 const bfd_target
*output
)
3938 return input
== output
;
3941 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3942 This version is used when different targets for the same architecture
3943 are virtually identical. */
3946 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3947 const bfd_target
*output
)
3949 const struct elf_backend_data
*obed
, *ibed
;
3951 if (input
== output
)
3954 ibed
= xvec_get_elf_backend_data (input
);
3955 obed
= xvec_get_elf_backend_data (output
);
3957 if (ibed
->arch
!= obed
->arch
)
3960 /* If both backends are using this function, deem them compatible. */
3961 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3964 /* Make a special call to the linker "notice" function to tell it that
3965 we are about to handle an as-needed lib, or have finished
3966 processing the lib. */
3969 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3970 struct bfd_link_info
*info
,
3971 enum notice_asneeded_action act
)
3973 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3976 /* Check relocations an ELF object file. */
3979 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3981 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3982 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3984 /* If this object is the same format as the output object, and it is
3985 not a shared library, then let the backend look through the
3988 This is required to build global offset table entries and to
3989 arrange for dynamic relocs. It is not required for the
3990 particular common case of linking non PIC code, even when linking
3991 against shared libraries, but unfortunately there is no way of
3992 knowing whether an object file has been compiled PIC or not.
3993 Looking through the relocs is not particularly time consuming.
3994 The problem is that we must either (1) keep the relocs in memory,
3995 which causes the linker to require additional runtime memory or
3996 (2) read the relocs twice from the input file, which wastes time.
3997 This would be a good case for using mmap.
3999 I have no idea how to handle linking PIC code into a file of a
4000 different format. It probably can't be done. */
4001 if ((abfd
->flags
& DYNAMIC
) == 0
4002 && is_elf_hash_table (htab
)
4003 && bed
->check_relocs
!= NULL
4004 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4005 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4009 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4011 Elf_Internal_Rela
*internal_relocs
;
4014 /* Don't check relocations in excluded sections. Don't do
4015 anything special with non-loaded, non-alloced sections.
4016 In particular, any relocs in such sections should not
4017 affect GOT and PLT reference counting (ie. we don't
4018 allow them to create GOT or PLT entries), there's no
4019 possibility or desire to optimize TLS relocs, and
4020 there's not much point in propagating relocs to shared
4021 libs that the dynamic linker won't relocate. */
4022 if ((o
->flags
& SEC_ALLOC
) == 0
4023 || (o
->flags
& SEC_RELOC
) == 0
4024 || (o
->flags
& SEC_EXCLUDE
) != 0
4025 || o
->reloc_count
== 0
4026 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4027 && (o
->flags
& SEC_DEBUGGING
) != 0)
4028 || bfd_is_abs_section (o
->output_section
))
4031 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4033 if (internal_relocs
== NULL
)
4036 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4038 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4039 free (internal_relocs
);
4049 /* Add symbols from an ELF object file to the linker hash table. */
4052 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4054 Elf_Internal_Ehdr
*ehdr
;
4055 Elf_Internal_Shdr
*hdr
;
4059 struct elf_link_hash_entry
**sym_hash
;
4060 bfd_boolean dynamic
;
4061 Elf_External_Versym
*extversym
= NULL
;
4062 Elf_External_Versym
*extversym_end
= NULL
;
4063 Elf_External_Versym
*ever
;
4064 struct elf_link_hash_entry
*weaks
;
4065 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4066 size_t nondeflt_vers_cnt
= 0;
4067 Elf_Internal_Sym
*isymbuf
= NULL
;
4068 Elf_Internal_Sym
*isym
;
4069 Elf_Internal_Sym
*isymend
;
4070 const struct elf_backend_data
*bed
;
4071 bfd_boolean add_needed
;
4072 struct elf_link_hash_table
*htab
;
4073 void *alloc_mark
= NULL
;
4074 struct bfd_hash_entry
**old_table
= NULL
;
4075 unsigned int old_size
= 0;
4076 unsigned int old_count
= 0;
4077 void *old_tab
= NULL
;
4079 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4080 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4081 void *old_strtab
= NULL
;
4084 bfd_boolean just_syms
;
4086 htab
= elf_hash_table (info
);
4087 bed
= get_elf_backend_data (abfd
);
4089 if ((abfd
->flags
& DYNAMIC
) == 0)
4095 /* You can't use -r against a dynamic object. Also, there's no
4096 hope of using a dynamic object which does not exactly match
4097 the format of the output file. */
4098 if (bfd_link_relocatable (info
)
4099 || !is_elf_hash_table (htab
)
4100 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4102 if (bfd_link_relocatable (info
))
4103 bfd_set_error (bfd_error_invalid_operation
);
4105 bfd_set_error (bfd_error_wrong_format
);
4110 ehdr
= elf_elfheader (abfd
);
4111 if (info
->warn_alternate_em
4112 && bed
->elf_machine_code
!= ehdr
->e_machine
4113 && ((bed
->elf_machine_alt1
!= 0
4114 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4115 || (bed
->elf_machine_alt2
!= 0
4116 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4118 /* xgettext:c-format */
4119 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4120 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4122 /* As a GNU extension, any input sections which are named
4123 .gnu.warning.SYMBOL are treated as warning symbols for the given
4124 symbol. This differs from .gnu.warning sections, which generate
4125 warnings when they are included in an output file. */
4126 /* PR 12761: Also generate this warning when building shared libraries. */
4127 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4131 name
= bfd_section_name (s
);
4132 if (CONST_STRNEQ (name
, ".gnu.warning."))
4137 name
+= sizeof ".gnu.warning." - 1;
4139 /* If this is a shared object, then look up the symbol
4140 in the hash table. If it is there, and it is already
4141 been defined, then we will not be using the entry
4142 from this shared object, so we don't need to warn.
4143 FIXME: If we see the definition in a regular object
4144 later on, we will warn, but we shouldn't. The only
4145 fix is to keep track of what warnings we are supposed
4146 to emit, and then handle them all at the end of the
4150 struct elf_link_hash_entry
*h
;
4152 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
4154 /* FIXME: What about bfd_link_hash_common? */
4156 && (h
->root
.type
== bfd_link_hash_defined
4157 || h
->root
.type
== bfd_link_hash_defweak
))
4162 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4166 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4171 if (! (_bfd_generic_link_add_one_symbol
4172 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4173 FALSE
, bed
->collect
, NULL
)))
4176 if (bfd_link_executable (info
))
4178 /* Clobber the section size so that the warning does
4179 not get copied into the output file. */
4182 /* Also set SEC_EXCLUDE, so that symbols defined in
4183 the warning section don't get copied to the output. */
4184 s
->flags
|= SEC_EXCLUDE
;
4189 just_syms
= ((s
= abfd
->sections
) != NULL
4190 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4195 /* If we are creating a shared library, create all the dynamic
4196 sections immediately. We need to attach them to something,
4197 so we attach them to this BFD, provided it is the right
4198 format and is not from ld --just-symbols. Always create the
4199 dynamic sections for -E/--dynamic-list. FIXME: If there
4200 are no input BFD's of the same format as the output, we can't
4201 make a shared library. */
4203 && (bfd_link_pic (info
)
4204 || (!bfd_link_relocatable (info
)
4206 && (info
->export_dynamic
|| info
->dynamic
)))
4207 && is_elf_hash_table (htab
)
4208 && info
->output_bfd
->xvec
== abfd
->xvec
4209 && !htab
->dynamic_sections_created
)
4211 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4215 else if (!is_elf_hash_table (htab
))
4219 const char *soname
= NULL
;
4221 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4222 const Elf_Internal_Phdr
*phdr
;
4223 struct elf_link_loaded_list
*loaded_lib
;
4225 /* ld --just-symbols and dynamic objects don't mix very well.
4226 ld shouldn't allow it. */
4230 /* If this dynamic lib was specified on the command line with
4231 --as-needed in effect, then we don't want to add a DT_NEEDED
4232 tag unless the lib is actually used. Similary for libs brought
4233 in by another lib's DT_NEEDED. When --no-add-needed is used
4234 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4235 any dynamic library in DT_NEEDED tags in the dynamic lib at
4237 add_needed
= (elf_dyn_lib_class (abfd
)
4238 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4239 | DYN_NO_NEEDED
)) == 0;
4241 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4246 unsigned int elfsec
;
4247 unsigned long shlink
;
4249 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4256 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4257 if (elfsec
== SHN_BAD
)
4258 goto error_free_dyn
;
4259 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4261 for (extdyn
= dynbuf
;
4262 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4263 extdyn
+= bed
->s
->sizeof_dyn
)
4265 Elf_Internal_Dyn dyn
;
4267 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4268 if (dyn
.d_tag
== DT_SONAME
)
4270 unsigned int tagv
= dyn
.d_un
.d_val
;
4271 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4273 goto error_free_dyn
;
4275 if (dyn
.d_tag
== DT_NEEDED
)
4277 struct bfd_link_needed_list
*n
, **pn
;
4279 unsigned int tagv
= dyn
.d_un
.d_val
;
4280 size_t amt
= sizeof (struct bfd_link_needed_list
);
4282 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4283 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4284 if (n
== NULL
|| fnm
== NULL
)
4285 goto error_free_dyn
;
4286 amt
= strlen (fnm
) + 1;
4287 anm
= (char *) bfd_alloc (abfd
, amt
);
4289 goto error_free_dyn
;
4290 memcpy (anm
, fnm
, amt
);
4294 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4298 if (dyn
.d_tag
== DT_RUNPATH
)
4300 struct bfd_link_needed_list
*n
, **pn
;
4302 unsigned int tagv
= dyn
.d_un
.d_val
;
4303 size_t amt
= sizeof (struct bfd_link_needed_list
);
4305 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4306 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4307 if (n
== NULL
|| fnm
== NULL
)
4308 goto error_free_dyn
;
4309 amt
= strlen (fnm
) + 1;
4310 anm
= (char *) bfd_alloc (abfd
, amt
);
4312 goto error_free_dyn
;
4313 memcpy (anm
, fnm
, amt
);
4317 for (pn
= & runpath
;
4323 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4324 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4326 struct bfd_link_needed_list
*n
, **pn
;
4328 unsigned int tagv
= dyn
.d_un
.d_val
;
4329 size_t amt
= sizeof (struct bfd_link_needed_list
);
4331 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4332 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4333 if (n
== NULL
|| fnm
== NULL
)
4334 goto error_free_dyn
;
4335 amt
= strlen (fnm
) + 1;
4336 anm
= (char *) bfd_alloc (abfd
, amt
);
4338 goto error_free_dyn
;
4339 memcpy (anm
, fnm
, amt
);
4349 if (dyn
.d_tag
== DT_AUDIT
)
4351 unsigned int tagv
= dyn
.d_un
.d_val
;
4352 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4359 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4360 frees all more recently bfd_alloc'd blocks as well. */
4366 struct bfd_link_needed_list
**pn
;
4367 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4372 /* If we have a PT_GNU_RELRO program header, mark as read-only
4373 all sections contained fully therein. This makes relro
4374 shared library sections appear as they will at run-time. */
4375 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4376 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4377 if (phdr
->p_type
== PT_GNU_RELRO
)
4379 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4381 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4383 if ((s
->flags
& SEC_ALLOC
) != 0
4384 && s
->vma
* opb
>= phdr
->p_vaddr
4385 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4386 s
->flags
|= SEC_READONLY
;
4391 /* We do not want to include any of the sections in a dynamic
4392 object in the output file. We hack by simply clobbering the
4393 list of sections in the BFD. This could be handled more
4394 cleanly by, say, a new section flag; the existing
4395 SEC_NEVER_LOAD flag is not the one we want, because that one
4396 still implies that the section takes up space in the output
4398 bfd_section_list_clear (abfd
);
4400 /* Find the name to use in a DT_NEEDED entry that refers to this
4401 object. If the object has a DT_SONAME entry, we use it.
4402 Otherwise, if the generic linker stuck something in
4403 elf_dt_name, we use that. Otherwise, we just use the file
4405 if (soname
== NULL
|| *soname
== '\0')
4407 soname
= elf_dt_name (abfd
);
4408 if (soname
== NULL
|| *soname
== '\0')
4409 soname
= bfd_get_filename (abfd
);
4412 /* Save the SONAME because sometimes the linker emulation code
4413 will need to know it. */
4414 elf_dt_name (abfd
) = soname
;
4416 /* If we have already included this dynamic object in the
4417 link, just ignore it. There is no reason to include a
4418 particular dynamic object more than once. */
4419 for (loaded_lib
= htab
->dyn_loaded
;
4421 loaded_lib
= loaded_lib
->next
)
4423 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4427 /* Create dynamic sections for backends that require that be done
4428 before setup_gnu_properties. */
4430 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4433 /* Save the DT_AUDIT entry for the linker emulation code. */
4434 elf_dt_audit (abfd
) = audit
;
4437 /* If this is a dynamic object, we always link against the .dynsym
4438 symbol table, not the .symtab symbol table. The dynamic linker
4439 will only see the .dynsym symbol table, so there is no reason to
4440 look at .symtab for a dynamic object. */
4442 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4443 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4445 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4447 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4449 /* The sh_info field of the symtab header tells us where the
4450 external symbols start. We don't care about the local symbols at
4452 if (elf_bad_symtab (abfd
))
4454 extsymcount
= symcount
;
4459 extsymcount
= symcount
- hdr
->sh_info
;
4460 extsymoff
= hdr
->sh_info
;
4463 sym_hash
= elf_sym_hashes (abfd
);
4464 if (extsymcount
!= 0)
4466 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4468 if (isymbuf
== NULL
)
4471 if (sym_hash
== NULL
)
4473 /* We store a pointer to the hash table entry for each
4475 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4476 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4477 if (sym_hash
== NULL
)
4478 goto error_free_sym
;
4479 elf_sym_hashes (abfd
) = sym_hash
;
4485 /* Read in any version definitions. */
4486 if (!_bfd_elf_slurp_version_tables (abfd
,
4487 info
->default_imported_symver
))
4488 goto error_free_sym
;
4490 /* Read in the symbol versions, but don't bother to convert them
4491 to internal format. */
4492 if (elf_dynversym (abfd
) != 0)
4494 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4495 bfd_size_type amt
= versymhdr
->sh_size
;
4497 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4498 goto error_free_sym
;
4499 extversym
= (Elf_External_Versym
*)
4500 _bfd_malloc_and_read (abfd
, amt
, amt
);
4501 if (extversym
== NULL
)
4502 goto error_free_sym
;
4503 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4507 /* If we are loading an as-needed shared lib, save the symbol table
4508 state before we start adding symbols. If the lib turns out
4509 to be unneeded, restore the state. */
4510 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4515 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4517 struct bfd_hash_entry
*p
;
4518 struct elf_link_hash_entry
*h
;
4520 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4522 h
= (struct elf_link_hash_entry
*) p
;
4523 entsize
+= htab
->root
.table
.entsize
;
4524 if (h
->root
.type
== bfd_link_hash_warning
)
4526 entsize
+= htab
->root
.table
.entsize
;
4527 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4529 if (h
->root
.type
== bfd_link_hash_common
)
4530 entsize
+= sizeof (*h
->root
.u
.c
.p
);
4534 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4535 old_tab
= bfd_malloc (tabsize
+ entsize
);
4536 if (old_tab
== NULL
)
4537 goto error_free_vers
;
4539 /* Remember the current objalloc pointer, so that all mem for
4540 symbols added can later be reclaimed. */
4541 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4542 if (alloc_mark
== NULL
)
4543 goto error_free_vers
;
4545 /* Make a special call to the linker "notice" function to
4546 tell it that we are about to handle an as-needed lib. */
4547 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4548 goto error_free_vers
;
4550 /* Clone the symbol table. Remember some pointers into the
4551 symbol table, and dynamic symbol count. */
4552 old_ent
= (char *) old_tab
+ tabsize
;
4553 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4554 old_undefs
= htab
->root
.undefs
;
4555 old_undefs_tail
= htab
->root
.undefs_tail
;
4556 old_table
= htab
->root
.table
.table
;
4557 old_size
= htab
->root
.table
.size
;
4558 old_count
= htab
->root
.table
.count
;
4560 if (htab
->dynstr
!= NULL
)
4562 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4563 if (old_strtab
== NULL
)
4564 goto error_free_vers
;
4567 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4569 struct bfd_hash_entry
*p
;
4570 struct elf_link_hash_entry
*h
;
4572 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4574 h
= (struct elf_link_hash_entry
*) p
;
4575 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4576 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4577 if (h
->root
.type
== bfd_link_hash_warning
)
4579 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4580 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4581 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4583 if (h
->root
.type
== bfd_link_hash_common
)
4585 memcpy (old_ent
, h
->root
.u
.c
.p
, sizeof (*h
->root
.u
.c
.p
));
4586 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
4593 if (extversym
== NULL
)
4595 else if (extversym
+ extsymoff
< extversym_end
)
4596 ever
= extversym
+ extsymoff
;
4599 /* xgettext:c-format */
4600 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4601 abfd
, (long) extsymoff
,
4602 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4603 bfd_set_error (bfd_error_bad_value
);
4604 goto error_free_vers
;
4607 if (!bfd_link_relocatable (info
)
4608 && abfd
->lto_slim_object
)
4611 (_("%pB: plugin needed to handle lto object"), abfd
);
4614 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4616 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4620 asection
*sec
, *new_sec
;
4623 struct elf_link_hash_entry
*h
;
4624 struct elf_link_hash_entry
*hi
;
4625 bfd_boolean definition
;
4626 bfd_boolean size_change_ok
;
4627 bfd_boolean type_change_ok
;
4628 bfd_boolean new_weak
;
4629 bfd_boolean old_weak
;
4632 bfd_boolean discarded
;
4633 unsigned int old_alignment
;
4634 unsigned int shindex
;
4636 bfd_boolean matched
;
4640 flags
= BSF_NO_FLAGS
;
4642 value
= isym
->st_value
;
4643 common
= bed
->common_definition (isym
);
4644 if (common
&& info
->inhibit_common_definition
)
4646 /* Treat common symbol as undefined for --no-define-common. */
4647 isym
->st_shndx
= SHN_UNDEF
;
4652 bind
= ELF_ST_BIND (isym
->st_info
);
4656 /* This should be impossible, since ELF requires that all
4657 global symbols follow all local symbols, and that sh_info
4658 point to the first global symbol. Unfortunately, Irix 5
4660 if (elf_bad_symtab (abfd
))
4663 /* If we aren't prepared to handle locals within the globals
4664 then we'll likely segfault on a NULL symbol hash if the
4665 symbol is ever referenced in relocations. */
4666 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4667 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4668 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4669 " (>= sh_info of %lu)"),
4670 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4673 /* Dynamic object relocations are not processed by ld, so
4674 ld won't run into the problem mentioned above. */
4677 bfd_set_error (bfd_error_bad_value
);
4678 goto error_free_vers
;
4681 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4689 case STB_GNU_UNIQUE
:
4690 flags
= BSF_GNU_UNIQUE
;
4694 /* Leave it up to the processor backend. */
4698 if (isym
->st_shndx
== SHN_UNDEF
)
4699 sec
= bfd_und_section_ptr
;
4700 else if (isym
->st_shndx
== SHN_ABS
)
4701 sec
= bfd_abs_section_ptr
;
4702 else if (isym
->st_shndx
== SHN_COMMON
)
4704 sec
= bfd_com_section_ptr
;
4705 /* What ELF calls the size we call the value. What ELF
4706 calls the value we call the alignment. */
4707 value
= isym
->st_size
;
4711 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4713 sec
= bfd_abs_section_ptr
;
4714 else if (discarded_section (sec
))
4716 /* Symbols from discarded section are undefined. We keep
4718 sec
= bfd_und_section_ptr
;
4720 isym
->st_shndx
= SHN_UNDEF
;
4722 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4726 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4729 goto error_free_vers
;
4731 if (isym
->st_shndx
== SHN_COMMON
4732 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4734 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4738 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4740 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4742 goto error_free_vers
;
4746 else if (isym
->st_shndx
== SHN_COMMON
4747 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4748 && !bfd_link_relocatable (info
))
4750 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4754 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4755 | SEC_LINKER_CREATED
);
4756 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4758 goto error_free_vers
;
4762 else if (bed
->elf_add_symbol_hook
)
4764 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4766 goto error_free_vers
;
4768 /* The hook function sets the name to NULL if this symbol
4769 should be skipped for some reason. */
4774 /* Sanity check that all possibilities were handled. */
4778 /* Silently discard TLS symbols from --just-syms. There's
4779 no way to combine a static TLS block with a new TLS block
4780 for this executable. */
4781 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4782 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4785 if (bfd_is_und_section (sec
)
4786 || bfd_is_com_section (sec
))
4791 size_change_ok
= FALSE
;
4792 type_change_ok
= bed
->type_change_ok
;
4799 if (is_elf_hash_table (htab
))
4801 Elf_Internal_Versym iver
;
4802 unsigned int vernum
= 0;
4807 if (info
->default_imported_symver
)
4808 /* Use the default symbol version created earlier. */
4809 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4813 else if (ever
>= extversym_end
)
4815 /* xgettext:c-format */
4816 _bfd_error_handler (_("%pB: not enough version information"),
4818 bfd_set_error (bfd_error_bad_value
);
4819 goto error_free_vers
;
4822 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4824 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4826 /* If this is a hidden symbol, or if it is not version
4827 1, we append the version name to the symbol name.
4828 However, we do not modify a non-hidden absolute symbol
4829 if it is not a function, because it might be the version
4830 symbol itself. FIXME: What if it isn't? */
4831 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4833 && (!bfd_is_abs_section (sec
)
4834 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4837 size_t namelen
, verlen
, newlen
;
4840 if (isym
->st_shndx
!= SHN_UNDEF
)
4842 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4844 else if (vernum
> 1)
4846 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4853 /* xgettext:c-format */
4854 (_("%pB: %s: invalid version %u (max %d)"),
4856 elf_tdata (abfd
)->cverdefs
);
4857 bfd_set_error (bfd_error_bad_value
);
4858 goto error_free_vers
;
4863 /* We cannot simply test for the number of
4864 entries in the VERNEED section since the
4865 numbers for the needed versions do not start
4867 Elf_Internal_Verneed
*t
;
4870 for (t
= elf_tdata (abfd
)->verref
;
4874 Elf_Internal_Vernaux
*a
;
4876 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4878 if (a
->vna_other
== vernum
)
4880 verstr
= a
->vna_nodename
;
4890 /* xgettext:c-format */
4891 (_("%pB: %s: invalid needed version %d"),
4892 abfd
, name
, vernum
);
4893 bfd_set_error (bfd_error_bad_value
);
4894 goto error_free_vers
;
4898 namelen
= strlen (name
);
4899 verlen
= strlen (verstr
);
4900 newlen
= namelen
+ verlen
+ 2;
4901 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4902 && isym
->st_shndx
!= SHN_UNDEF
)
4905 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4906 if (newname
== NULL
)
4907 goto error_free_vers
;
4908 memcpy (newname
, name
, namelen
);
4909 p
= newname
+ namelen
;
4911 /* If this is a defined non-hidden version symbol,
4912 we add another @ to the name. This indicates the
4913 default version of the symbol. */
4914 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4915 && isym
->st_shndx
!= SHN_UNDEF
)
4917 memcpy (p
, verstr
, verlen
+ 1);
4922 /* If this symbol has default visibility and the user has
4923 requested we not re-export it, then mark it as hidden. */
4924 if (!bfd_is_und_section (sec
)
4927 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4928 isym
->st_other
= (STV_HIDDEN
4929 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4931 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4932 sym_hash
, &old_bfd
, &old_weak
,
4933 &old_alignment
, &skip
, &override
,
4934 &type_change_ok
, &size_change_ok
,
4936 goto error_free_vers
;
4941 /* Override a definition only if the new symbol matches the
4943 if (override
&& matched
)
4947 while (h
->root
.type
== bfd_link_hash_indirect
4948 || h
->root
.type
== bfd_link_hash_warning
)
4949 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4951 if (elf_tdata (abfd
)->verdef
!= NULL
4954 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4957 if (! (_bfd_generic_link_add_one_symbol
4958 (info
, override
? override
: abfd
, name
, flags
, sec
, value
,
4959 NULL
, FALSE
, bed
->collect
,
4960 (struct bfd_link_hash_entry
**) sym_hash
)))
4961 goto error_free_vers
;
4964 /* We need to make sure that indirect symbol dynamic flags are
4967 while (h
->root
.type
== bfd_link_hash_indirect
4968 || h
->root
.type
== bfd_link_hash_warning
)
4969 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4971 /* Setting the index to -3 tells elf_link_output_extsym that
4972 this symbol is defined in a discarded section. */
4978 new_weak
= (flags
& BSF_WEAK
) != 0;
4982 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4983 && is_elf_hash_table (htab
)
4984 && h
->u
.alias
== NULL
)
4986 /* Keep a list of all weak defined non function symbols from
4987 a dynamic object, using the alias field. Later in this
4988 function we will set the alias field to the correct
4989 value. We only put non-function symbols from dynamic
4990 objects on this list, because that happens to be the only
4991 time we need to know the normal symbol corresponding to a
4992 weak symbol, and the information is time consuming to
4993 figure out. If the alias field is not already NULL,
4994 then this symbol was already defined by some previous
4995 dynamic object, and we will be using that previous
4996 definition anyhow. */
5002 /* Set the alignment of a common symbol. */
5003 if ((common
|| bfd_is_com_section (sec
))
5004 && h
->root
.type
== bfd_link_hash_common
)
5009 align
= bfd_log2 (isym
->st_value
);
5012 /* The new symbol is a common symbol in a shared object.
5013 We need to get the alignment from the section. */
5014 align
= new_sec
->alignment_power
;
5016 if (align
> old_alignment
)
5017 h
->root
.u
.c
.p
->alignment_power
= align
;
5019 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
5022 if (is_elf_hash_table (htab
))
5024 /* Set a flag in the hash table entry indicating the type of
5025 reference or definition we just found. A dynamic symbol
5026 is one which is referenced or defined by both a regular
5027 object and a shared object. */
5028 bfd_boolean dynsym
= FALSE
;
5030 /* Plugin symbols aren't normal. Don't set def/ref flags. */
5031 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5038 if (bind
!= STB_WEAK
)
5039 h
->ref_regular_nonweak
= 1;
5056 hi
->ref_dynamic
= 1;
5061 hi
->def_dynamic
= 1;
5065 /* If an indirect symbol has been forced local, don't
5066 make the real symbol dynamic. */
5067 if (h
!= hi
&& hi
->forced_local
)
5071 if (bfd_link_dll (info
)
5081 && weakdef (h
)->dynindx
!= -1))
5085 /* Check to see if we need to add an indirect symbol for
5086 the default name. */
5088 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5090 && hi
->versioned
== versioned_hidden
))
5091 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5092 sec
, value
, &old_bfd
, &dynsym
))
5093 goto error_free_vers
;
5095 /* Check the alignment when a common symbol is involved. This
5096 can change when a common symbol is overridden by a normal
5097 definition or a common symbol is ignored due to the old
5098 normal definition. We need to make sure the maximum
5099 alignment is maintained. */
5100 if ((old_alignment
|| common
)
5101 && h
->root
.type
!= bfd_link_hash_common
)
5103 unsigned int common_align
;
5104 unsigned int normal_align
;
5105 unsigned int symbol_align
;
5109 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5110 || h
->root
.type
== bfd_link_hash_defweak
);
5112 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5113 if (h
->root
.u
.def
.section
->owner
!= NULL
5114 && (h
->root
.u
.def
.section
->owner
->flags
5115 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5117 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5118 if (normal_align
> symbol_align
)
5119 normal_align
= symbol_align
;
5122 normal_align
= symbol_align
;
5126 common_align
= old_alignment
;
5127 common_bfd
= old_bfd
;
5132 common_align
= bfd_log2 (isym
->st_value
);
5134 normal_bfd
= old_bfd
;
5137 if (normal_align
< common_align
)
5139 /* PR binutils/2735 */
5140 if (normal_bfd
== NULL
)
5142 /* xgettext:c-format */
5143 (_("warning: alignment %u of common symbol `%s' in %pB is"
5144 " greater than the alignment (%u) of its section %pA"),
5145 1 << common_align
, name
, common_bfd
,
5146 1 << normal_align
, h
->root
.u
.def
.section
);
5149 /* xgettext:c-format */
5150 (_("warning: alignment %u of symbol `%s' in %pB"
5151 " is smaller than %u in %pB"),
5152 1 << normal_align
, name
, normal_bfd
,
5153 1 << common_align
, common_bfd
);
5157 /* Remember the symbol size if it isn't undefined. */
5158 if (isym
->st_size
!= 0
5159 && isym
->st_shndx
!= SHN_UNDEF
5160 && (definition
|| h
->size
== 0))
5163 && h
->size
!= isym
->st_size
5164 && ! size_change_ok
)
5166 /* xgettext:c-format */
5167 (_("warning: size of symbol `%s' changed"
5168 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5169 name
, (uint64_t) h
->size
, old_bfd
,
5170 (uint64_t) isym
->st_size
, abfd
);
5172 h
->size
= isym
->st_size
;
5175 /* If this is a common symbol, then we always want H->SIZE
5176 to be the size of the common symbol. The code just above
5177 won't fix the size if a common symbol becomes larger. We
5178 don't warn about a size change here, because that is
5179 covered by --warn-common. Allow changes between different
5181 if (h
->root
.type
== bfd_link_hash_common
)
5182 h
->size
= h
->root
.u
.c
.size
;
5184 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5185 && ((definition
&& !new_weak
)
5186 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5187 || h
->type
== STT_NOTYPE
))
5189 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5191 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5193 if (type
== STT_GNU_IFUNC
5194 && (abfd
->flags
& DYNAMIC
) != 0)
5197 if (h
->type
!= type
)
5199 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5200 /* xgettext:c-format */
5202 (_("warning: type of symbol `%s' changed"
5203 " from %d to %d in %pB"),
5204 name
, h
->type
, type
, abfd
);
5210 /* Merge st_other field. */
5211 elf_merge_st_other (abfd
, h
, isym
->st_other
, sec
,
5212 definition
, dynamic
);
5214 /* We don't want to make debug symbol dynamic. */
5216 && (sec
->flags
& SEC_DEBUGGING
)
5217 && !bfd_link_relocatable (info
))
5220 /* Nor should we make plugin symbols dynamic. */
5221 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5226 h
->target_internal
= isym
->st_target_internal
;
5227 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5230 if (definition
&& !dynamic
)
5232 char *p
= strchr (name
, ELF_VER_CHR
);
5233 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5235 /* Queue non-default versions so that .symver x, x@FOO
5236 aliases can be checked. */
5239 size_t amt
= ((isymend
- isym
+ 1)
5240 * sizeof (struct elf_link_hash_entry
*));
5242 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5244 goto error_free_vers
;
5246 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5250 if (dynsym
&& h
->dynindx
== -1)
5252 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5253 goto error_free_vers
;
5255 && weakdef (h
)->dynindx
== -1)
5257 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5258 goto error_free_vers
;
5261 else if (h
->dynindx
!= -1)
5262 /* If the symbol already has a dynamic index, but
5263 visibility says it should not be visible, turn it into
5265 switch (ELF_ST_VISIBILITY (h
->other
))
5269 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
5277 && h
->root
.type
!= bfd_link_hash_indirect
5279 && h
->ref_regular_nonweak
)
5281 && (old_bfd
->flags
& BFD_PLUGIN
) != 0
5282 && bind
!= STB_WEAK
)
5283 || (h
->ref_dynamic_nonweak
5284 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5285 && !on_needed_list (elf_dt_name (abfd
),
5286 htab
->needed
, NULL
))))
5288 const char *soname
= elf_dt_name (abfd
);
5290 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5291 h
->root
.root
.string
);
5293 /* A symbol from a library loaded via DT_NEEDED of some
5294 other library is referenced by a regular object.
5295 Add a DT_NEEDED entry for it. Issue an error if
5296 --no-add-needed is used and the reference was not
5299 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5302 /* xgettext:c-format */
5303 (_("%pB: undefined reference to symbol '%s'"),
5305 bfd_set_error (bfd_error_missing_dso
);
5306 goto error_free_vers
;
5309 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5310 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5312 /* Create dynamic sections for backends that require
5313 that be done before setup_gnu_properties. */
5314 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5321 if (info
->lto_plugin_active
5322 && !bfd_link_relocatable (info
)
5323 && (abfd
->flags
& BFD_PLUGIN
) == 0
5329 if (bed
->s
->arch_size
== 32)
5334 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5335 referenced in regular objects so that linker plugin will get
5336 the correct symbol resolution. */
5338 sym_hash
= elf_sym_hashes (abfd
);
5339 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5341 Elf_Internal_Rela
*internal_relocs
;
5342 Elf_Internal_Rela
*rel
, *relend
;
5344 /* Don't check relocations in excluded sections. */
5345 if ((s
->flags
& SEC_RELOC
) == 0
5346 || s
->reloc_count
== 0
5347 || (s
->flags
& SEC_EXCLUDE
) != 0
5348 || ((info
->strip
== strip_all
5349 || info
->strip
== strip_debugger
)
5350 && (s
->flags
& SEC_DEBUGGING
) != 0))
5353 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5356 if (internal_relocs
== NULL
)
5357 goto error_free_vers
;
5359 rel
= internal_relocs
;
5360 relend
= rel
+ s
->reloc_count
;
5361 for ( ; rel
< relend
; rel
++)
5363 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5364 struct elf_link_hash_entry
*h
;
5366 /* Skip local symbols. */
5367 if (r_symndx
< extsymoff
)
5370 h
= sym_hash
[r_symndx
- extsymoff
];
5372 h
->root
.non_ir_ref_regular
= 1;
5375 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5376 free (internal_relocs
);
5385 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5389 /* Restore the symbol table. */
5390 old_ent
= (char *) old_tab
+ tabsize
;
5391 memset (elf_sym_hashes (abfd
), 0,
5392 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5393 htab
->root
.table
.table
= old_table
;
5394 htab
->root
.table
.size
= old_size
;
5395 htab
->root
.table
.count
= old_count
;
5396 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5397 htab
->root
.undefs
= old_undefs
;
5398 htab
->root
.undefs_tail
= old_undefs_tail
;
5399 if (htab
->dynstr
!= NULL
)
5400 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5403 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5405 struct bfd_hash_entry
*p
;
5406 struct elf_link_hash_entry
*h
;
5407 unsigned int non_ir_ref_dynamic
;
5409 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5411 /* Preserve non_ir_ref_dynamic so that this symbol
5412 will be exported when the dynamic lib becomes needed
5413 in the second pass. */
5414 h
= (struct elf_link_hash_entry
*) p
;
5415 if (h
->root
.type
== bfd_link_hash_warning
)
5416 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5417 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5419 h
= (struct elf_link_hash_entry
*) p
;
5420 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5421 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5422 if (h
->root
.type
== bfd_link_hash_warning
)
5424 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5425 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5426 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5428 if (h
->root
.type
== bfd_link_hash_common
)
5430 memcpy (h
->root
.u
.c
.p
, old_ent
, sizeof (*h
->root
.u
.c
.p
));
5431 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
5433 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5437 /* Make a special call to the linker "notice" function to
5438 tell it that symbols added for crefs may need to be removed. */
5439 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5440 goto error_free_vers
;
5443 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5445 free (nondeflt_vers
);
5449 if (old_tab
!= NULL
)
5451 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5452 goto error_free_vers
;
5457 /* Now that all the symbols from this input file are created, if
5458 not performing a relocatable link, handle .symver foo, foo@BAR
5459 such that any relocs against foo become foo@BAR. */
5460 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5464 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5466 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5467 char *shortname
, *p
;
5470 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5472 || (h
->root
.type
!= bfd_link_hash_defined
5473 && h
->root
.type
!= bfd_link_hash_defweak
))
5476 amt
= p
- h
->root
.root
.string
;
5477 shortname
= (char *) bfd_malloc (amt
+ 1);
5479 goto error_free_vers
;
5480 memcpy (shortname
, h
->root
.root
.string
, amt
);
5481 shortname
[amt
] = '\0';
5483 hi
= (struct elf_link_hash_entry
*)
5484 bfd_link_hash_lookup (&htab
->root
, shortname
,
5485 FALSE
, FALSE
, FALSE
);
5487 && hi
->root
.type
== h
->root
.type
5488 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5489 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5491 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
5492 hi
->root
.type
= bfd_link_hash_indirect
;
5493 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5494 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5495 sym_hash
= elf_sym_hashes (abfd
);
5497 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5498 if (sym_hash
[symidx
] == hi
)
5500 sym_hash
[symidx
] = h
;
5506 free (nondeflt_vers
);
5507 nondeflt_vers
= NULL
;
5510 /* Now set the alias field correctly for all the weak defined
5511 symbols we found. The only way to do this is to search all the
5512 symbols. Since we only need the information for non functions in
5513 dynamic objects, that's the only time we actually put anything on
5514 the list WEAKS. We need this information so that if a regular
5515 object refers to a symbol defined weakly in a dynamic object, the
5516 real symbol in the dynamic object is also put in the dynamic
5517 symbols; we also must arrange for both symbols to point to the
5518 same memory location. We could handle the general case of symbol
5519 aliasing, but a general symbol alias can only be generated in
5520 assembler code, handling it correctly would be very time
5521 consuming, and other ELF linkers don't handle general aliasing
5525 struct elf_link_hash_entry
**hpp
;
5526 struct elf_link_hash_entry
**hppend
;
5527 struct elf_link_hash_entry
**sorted_sym_hash
;
5528 struct elf_link_hash_entry
*h
;
5529 size_t sym_count
, amt
;
5531 /* Since we have to search the whole symbol list for each weak
5532 defined symbol, search time for N weak defined symbols will be
5533 O(N^2). Binary search will cut it down to O(NlogN). */
5534 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5535 sorted_sym_hash
= bfd_malloc (amt
);
5536 if (sorted_sym_hash
== NULL
)
5538 sym_hash
= sorted_sym_hash
;
5539 hpp
= elf_sym_hashes (abfd
);
5540 hppend
= hpp
+ extsymcount
;
5542 for (; hpp
< hppend
; hpp
++)
5546 && h
->root
.type
== bfd_link_hash_defined
5547 && !bed
->is_function_type (h
->type
))
5555 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5558 while (weaks
!= NULL
)
5560 struct elf_link_hash_entry
*hlook
;
5563 size_t i
, j
, idx
= 0;
5566 weaks
= hlook
->u
.alias
;
5567 hlook
->u
.alias
= NULL
;
5569 if (hlook
->root
.type
!= bfd_link_hash_defined
5570 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5573 slook
= hlook
->root
.u
.def
.section
;
5574 vlook
= hlook
->root
.u
.def
.value
;
5580 bfd_signed_vma vdiff
;
5582 h
= sorted_sym_hash
[idx
];
5583 vdiff
= vlook
- h
->root
.u
.def
.value
;
5590 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5600 /* We didn't find a value/section match. */
5604 /* With multiple aliases, or when the weak symbol is already
5605 strongly defined, we have multiple matching symbols and
5606 the binary search above may land on any of them. Step
5607 one past the matching symbol(s). */
5610 h
= sorted_sym_hash
[idx
];
5611 if (h
->root
.u
.def
.section
!= slook
5612 || h
->root
.u
.def
.value
!= vlook
)
5616 /* Now look back over the aliases. Since we sorted by size
5617 as well as value and section, we'll choose the one with
5618 the largest size. */
5621 h
= sorted_sym_hash
[idx
];
5623 /* Stop if value or section doesn't match. */
5624 if (h
->root
.u
.def
.section
!= slook
5625 || h
->root
.u
.def
.value
!= vlook
)
5627 else if (h
!= hlook
)
5629 struct elf_link_hash_entry
*t
;
5632 hlook
->is_weakalias
= 1;
5634 if (t
->u
.alias
!= NULL
)
5635 while (t
->u
.alias
!= h
)
5639 /* If the weak definition is in the list of dynamic
5640 symbols, make sure the real definition is put
5642 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5644 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5647 free (sorted_sym_hash
);
5652 /* If the real definition is in the list of dynamic
5653 symbols, make sure the weak definition is put
5654 there as well. If we don't do this, then the
5655 dynamic loader might not merge the entries for the
5656 real definition and the weak definition. */
5657 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5659 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5660 goto err_free_sym_hash
;
5667 free (sorted_sym_hash
);
5670 if (bed
->check_directives
5671 && !(*bed
->check_directives
) (abfd
, info
))
5674 /* If this is a non-traditional link, try to optimize the handling
5675 of the .stab/.stabstr sections. */
5677 && ! info
->traditional_format
5678 && is_elf_hash_table (htab
)
5679 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5683 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5684 if (stabstr
!= NULL
)
5686 bfd_size_type string_offset
= 0;
5689 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5690 if (CONST_STRNEQ (stab
->name
, ".stab")
5691 && (!stab
->name
[5] ||
5692 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5693 && (stab
->flags
& SEC_MERGE
) == 0
5694 && !bfd_is_abs_section (stab
->output_section
))
5696 struct bfd_elf_section_data
*secdata
;
5698 secdata
= elf_section_data (stab
);
5699 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5700 stabstr
, &secdata
->sec_info
,
5703 if (secdata
->sec_info
)
5704 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5709 if (dynamic
&& add_needed
)
5711 /* Add this bfd to the loaded list. */
5712 struct elf_link_loaded_list
*n
;
5714 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5718 n
->next
= htab
->dyn_loaded
;
5719 htab
->dyn_loaded
= n
;
5721 if (dynamic
&& !add_needed
5722 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5723 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5730 free (nondeflt_vers
);
5738 /* Return the linker hash table entry of a symbol that might be
5739 satisfied by an archive symbol. Return -1 on error. */
5741 struct elf_link_hash_entry
*
5742 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5743 struct bfd_link_info
*info
,
5746 struct elf_link_hash_entry
*h
;
5750 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
5754 /* If this is a default version (the name contains @@), look up the
5755 symbol again with only one `@' as well as without the version.
5756 The effect is that references to the symbol with and without the
5757 version will be matched by the default symbol in the archive. */
5759 p
= strchr (name
, ELF_VER_CHR
);
5760 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5763 /* First check with only one `@'. */
5764 len
= strlen (name
);
5765 copy
= (char *) bfd_alloc (abfd
, len
);
5767 return (struct elf_link_hash_entry
*) -1;
5769 first
= p
- name
+ 1;
5770 memcpy (copy
, name
, first
);
5771 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5773 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
5776 /* We also need to check references to the symbol without the
5778 copy
[first
- 1] = '\0';
5779 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5780 FALSE
, FALSE
, TRUE
);
5783 bfd_release (abfd
, copy
);
5787 /* Add symbols from an ELF archive file to the linker hash table. We
5788 don't use _bfd_generic_link_add_archive_symbols because we need to
5789 handle versioned symbols.
5791 Fortunately, ELF archive handling is simpler than that done by
5792 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5793 oddities. In ELF, if we find a symbol in the archive map, and the
5794 symbol is currently undefined, we know that we must pull in that
5797 Unfortunately, we do have to make multiple passes over the symbol
5798 table until nothing further is resolved. */
5801 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5804 unsigned char *included
= NULL
;
5808 const struct elf_backend_data
*bed
;
5809 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5810 (bfd
*, struct bfd_link_info
*, const char *);
5812 if (! bfd_has_map (abfd
))
5814 /* An empty archive is a special case. */
5815 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5817 bfd_set_error (bfd_error_no_armap
);
5821 /* Keep track of all symbols we know to be already defined, and all
5822 files we know to be already included. This is to speed up the
5823 second and subsequent passes. */
5824 c
= bfd_ardata (abfd
)->symdef_count
;
5827 amt
= c
* sizeof (*included
);
5828 included
= (unsigned char *) bfd_zmalloc (amt
);
5829 if (included
== NULL
)
5832 symdefs
= bfd_ardata (abfd
)->symdefs
;
5833 bed
= get_elf_backend_data (abfd
);
5834 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5847 symdefend
= symdef
+ c
;
5848 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5850 struct elf_link_hash_entry
*h
;
5852 struct bfd_link_hash_entry
*undefs_tail
;
5857 if (symdef
->file_offset
== last
)
5863 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5864 if (h
== (struct elf_link_hash_entry
*) -1)
5870 if (h
->root
.type
== bfd_link_hash_undefined
)
5872 /* If the archive element has already been loaded then one
5873 of the symbols defined by that element might have been
5874 made undefined due to being in a discarded section. */
5878 else if (h
->root
.type
== bfd_link_hash_common
)
5880 /* We currently have a common symbol. The archive map contains
5881 a reference to this symbol, so we may want to include it. We
5882 only want to include it however, if this archive element
5883 contains a definition of the symbol, not just another common
5886 Unfortunately some archivers (including GNU ar) will put
5887 declarations of common symbols into their archive maps, as
5888 well as real definitions, so we cannot just go by the archive
5889 map alone. Instead we must read in the element's symbol
5890 table and check that to see what kind of symbol definition
5892 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5897 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5898 /* Symbol must be defined. Don't check it again. */
5903 /* We need to include this archive member. */
5904 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5905 if (element
== NULL
)
5908 if (! bfd_check_format (element
, bfd_object
))
5911 undefs_tail
= info
->hash
->undefs_tail
;
5913 if (!(*info
->callbacks
5914 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5916 if (!bfd_link_add_symbols (element
, info
))
5919 /* If there are any new undefined symbols, we need to make
5920 another pass through the archive in order to see whether
5921 they can be defined. FIXME: This isn't perfect, because
5922 common symbols wind up on undefs_tail and because an
5923 undefined symbol which is defined later on in this pass
5924 does not require another pass. This isn't a bug, but it
5925 does make the code less efficient than it could be. */
5926 if (undefs_tail
!= info
->hash
->undefs_tail
)
5929 /* Look backward to mark all symbols from this object file
5930 which we have already seen in this pass. */
5934 included
[mark
] = TRUE
;
5939 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5941 /* We mark subsequent symbols from this object file as we go
5942 on through the loop. */
5943 last
= symdef
->file_offset
;
5956 /* Given an ELF BFD, add symbols to the global hash table as
5960 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5962 switch (bfd_get_format (abfd
))
5965 return elf_link_add_object_symbols (abfd
, info
);
5967 return elf_link_add_archive_symbols (abfd
, info
);
5969 bfd_set_error (bfd_error_wrong_format
);
5974 struct hash_codes_info
5976 unsigned long *hashcodes
;
5980 /* This function will be called though elf_link_hash_traverse to store
5981 all hash value of the exported symbols in an array. */
5984 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5986 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5991 /* Ignore indirect symbols. These are added by the versioning code. */
5992 if (h
->dynindx
== -1)
5995 name
= h
->root
.root
.string
;
5996 if (h
->versioned
>= versioned
)
5998 char *p
= strchr (name
, ELF_VER_CHR
);
6001 alc
= (char *) bfd_malloc (p
- name
+ 1);
6007 memcpy (alc
, name
, p
- name
);
6008 alc
[p
- name
] = '\0';
6013 /* Compute the hash value. */
6014 ha
= bfd_elf_hash (name
);
6016 /* Store the found hash value in the array given as the argument. */
6017 *(inf
->hashcodes
)++ = ha
;
6019 /* And store it in the struct so that we can put it in the hash table
6021 h
->u
.elf_hash_value
= ha
;
6027 struct collect_gnu_hash_codes
6030 const struct elf_backend_data
*bed
;
6031 unsigned long int nsyms
;
6032 unsigned long int maskbits
;
6033 unsigned long int *hashcodes
;
6034 unsigned long int *hashval
;
6035 unsigned long int *indx
;
6036 unsigned long int *counts
;
6040 long int min_dynindx
;
6041 unsigned long int bucketcount
;
6042 unsigned long int symindx
;
6043 long int local_indx
;
6044 long int shift1
, shift2
;
6045 unsigned long int mask
;
6049 /* This function will be called though elf_link_hash_traverse to store
6050 all hash value of the exported symbols in an array. */
6053 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6055 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6060 /* Ignore indirect symbols. These are added by the versioning code. */
6061 if (h
->dynindx
== -1)
6064 /* Ignore also local symbols and undefined symbols. */
6065 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6068 name
= h
->root
.root
.string
;
6069 if (h
->versioned
>= versioned
)
6071 char *p
= strchr (name
, ELF_VER_CHR
);
6074 alc
= (char *) bfd_malloc (p
- name
+ 1);
6080 memcpy (alc
, name
, p
- name
);
6081 alc
[p
- name
] = '\0';
6086 /* Compute the hash value. */
6087 ha
= bfd_elf_gnu_hash (name
);
6089 /* Store the found hash value in the array for compute_bucket_count,
6090 and also for .dynsym reordering purposes. */
6091 s
->hashcodes
[s
->nsyms
] = ha
;
6092 s
->hashval
[h
->dynindx
] = ha
;
6094 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6095 s
->min_dynindx
= h
->dynindx
;
6101 /* This function will be called though elf_link_hash_traverse to do
6102 final dynamic symbol renumbering in case of .gnu.hash.
6103 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6104 to the translation table. */
6107 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6109 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6110 unsigned long int bucket
;
6111 unsigned long int val
;
6113 /* Ignore indirect symbols. */
6114 if (h
->dynindx
== -1)
6117 /* Ignore also local symbols and undefined symbols. */
6118 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6120 if (h
->dynindx
>= s
->min_dynindx
)
6122 if (s
->bed
->record_xhash_symbol
!= NULL
)
6124 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6128 h
->dynindx
= s
->local_indx
++;
6133 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6134 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6135 & ((s
->maskbits
>> s
->shift1
) - 1);
6136 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6138 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6139 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6140 if (s
->counts
[bucket
] == 1)
6141 /* Last element terminates the chain. */
6143 bfd_put_32 (s
->output_bfd
, val
,
6144 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6145 --s
->counts
[bucket
];
6146 if (s
->bed
->record_xhash_symbol
!= NULL
)
6148 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6150 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6153 h
->dynindx
= s
->indx
[bucket
]++;
6157 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6160 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6162 return !(h
->forced_local
6163 || h
->root
.type
== bfd_link_hash_undefined
6164 || h
->root
.type
== bfd_link_hash_undefweak
6165 || ((h
->root
.type
== bfd_link_hash_defined
6166 || h
->root
.type
== bfd_link_hash_defweak
)
6167 && h
->root
.u
.def
.section
->output_section
== NULL
));
6170 /* Array used to determine the number of hash table buckets to use
6171 based on the number of symbols there are. If there are fewer than
6172 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6173 fewer than 37 we use 17 buckets, and so forth. We never use more
6174 than 32771 buckets. */
6176 static const size_t elf_buckets
[] =
6178 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6182 /* Compute bucket count for hashing table. We do not use a static set
6183 of possible tables sizes anymore. Instead we determine for all
6184 possible reasonable sizes of the table the outcome (i.e., the
6185 number of collisions etc) and choose the best solution. The
6186 weighting functions are not too simple to allow the table to grow
6187 without bounds. Instead one of the weighting factors is the size.
6188 Therefore the result is always a good payoff between few collisions
6189 (= short chain lengths) and table size. */
6191 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6192 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6193 unsigned long int nsyms
,
6196 size_t best_size
= 0;
6197 unsigned long int i
;
6199 /* We have a problem here. The following code to optimize the table
6200 size requires an integer type with more the 32 bits. If
6201 BFD_HOST_U_64_BIT is set we know about such a type. */
6202 #ifdef BFD_HOST_U_64_BIT
6207 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6208 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6209 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6210 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6211 unsigned long int *counts
;
6213 unsigned int no_improvement_count
= 0;
6215 /* Possible optimization parameters: if we have NSYMS symbols we say
6216 that the hashing table must at least have NSYMS/4 and at most
6218 minsize
= nsyms
/ 4;
6221 best_size
= maxsize
= nsyms
* 2;
6226 if ((best_size
& 31) == 0)
6230 /* Create array where we count the collisions in. We must use bfd_malloc
6231 since the size could be large. */
6233 amt
*= sizeof (unsigned long int);
6234 counts
= (unsigned long int *) bfd_malloc (amt
);
6238 /* Compute the "optimal" size for the hash table. The criteria is a
6239 minimal chain length. The minor criteria is (of course) the size
6241 for (i
= minsize
; i
< maxsize
; ++i
)
6243 /* Walk through the array of hashcodes and count the collisions. */
6244 BFD_HOST_U_64_BIT max
;
6245 unsigned long int j
;
6246 unsigned long int fact
;
6248 if (gnu_hash
&& (i
& 31) == 0)
6251 memset (counts
, '\0', i
* sizeof (unsigned long int));
6253 /* Determine how often each hash bucket is used. */
6254 for (j
= 0; j
< nsyms
; ++j
)
6255 ++counts
[hashcodes
[j
] % i
];
6257 /* For the weight function we need some information about the
6258 pagesize on the target. This is information need not be 100%
6259 accurate. Since this information is not available (so far) we
6260 define it here to a reasonable default value. If it is crucial
6261 to have a better value some day simply define this value. */
6262 # ifndef BFD_TARGET_PAGESIZE
6263 # define BFD_TARGET_PAGESIZE (4096)
6266 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6268 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6271 /* Variant 1: optimize for short chains. We add the squares
6272 of all the chain lengths (which favors many small chain
6273 over a few long chains). */
6274 for (j
= 0; j
< i
; ++j
)
6275 max
+= counts
[j
] * counts
[j
];
6277 /* This adds penalties for the overall size of the table. */
6278 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6281 /* Variant 2: Optimize a lot more for small table. Here we
6282 also add squares of the size but we also add penalties for
6283 empty slots (the +1 term). */
6284 for (j
= 0; j
< i
; ++j
)
6285 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6287 /* The overall size of the table is considered, but not as
6288 strong as in variant 1, where it is squared. */
6289 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6293 /* Compare with current best results. */
6294 if (max
< best_chlen
)
6298 no_improvement_count
= 0;
6300 /* PR 11843: Avoid futile long searches for the best bucket size
6301 when there are a large number of symbols. */
6302 else if (++no_improvement_count
== 100)
6309 #endif /* defined (BFD_HOST_U_64_BIT) */
6311 /* This is the fallback solution if no 64bit type is available or if we
6312 are not supposed to spend much time on optimizations. We select the
6313 bucket count using a fixed set of numbers. */
6314 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6316 best_size
= elf_buckets
[i
];
6317 if (nsyms
< elf_buckets
[i
+ 1])
6320 if (gnu_hash
&& best_size
< 2)
6327 /* Size any SHT_GROUP section for ld -r. */
6330 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6335 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6336 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6337 && (s
= ibfd
->sections
) != NULL
6338 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6339 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6344 /* Set a default stack segment size. The value in INFO wins. If it
6345 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6346 undefined it is initialized. */
6349 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6350 struct bfd_link_info
*info
,
6351 const char *legacy_symbol
,
6352 bfd_vma default_size
)
6354 struct elf_link_hash_entry
*h
= NULL
;
6356 /* Look for legacy symbol. */
6358 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6359 FALSE
, FALSE
, FALSE
);
6360 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6361 || h
->root
.type
== bfd_link_hash_defweak
)
6363 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6365 /* The symbol has no type if specified on the command line. */
6366 h
->type
= STT_OBJECT
;
6367 if (info
->stacksize
)
6368 /* xgettext:c-format */
6369 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6370 output_bfd
, legacy_symbol
);
6371 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6372 /* xgettext:c-format */
6373 _bfd_error_handler (_("%pB: %s not absolute"),
6374 output_bfd
, legacy_symbol
);
6376 info
->stacksize
= h
->root
.u
.def
.value
;
6379 if (!info
->stacksize
)
6380 /* If the user didn't set a size, or explicitly inhibit the
6381 size, set it now. */
6382 info
->stacksize
= default_size
;
6384 /* Provide the legacy symbol, if it is referenced. */
6385 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6386 || h
->root
.type
== bfd_link_hash_undefweak
))
6388 struct bfd_link_hash_entry
*bh
= NULL
;
6390 if (!(_bfd_generic_link_add_one_symbol
6391 (info
, output_bfd
, legacy_symbol
,
6392 BSF_GLOBAL
, bfd_abs_section_ptr
,
6393 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6394 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6397 h
= (struct elf_link_hash_entry
*) bh
;
6399 h
->type
= STT_OBJECT
;
6405 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6407 struct elf_gc_sweep_symbol_info
6409 struct bfd_link_info
*info
;
6410 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6415 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6418 && (((h
->root
.type
== bfd_link_hash_defined
6419 || h
->root
.type
== bfd_link_hash_defweak
)
6420 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6421 && h
->root
.u
.def
.section
->gc_mark
))
6422 || h
->root
.type
== bfd_link_hash_undefined
6423 || h
->root
.type
== bfd_link_hash_undefweak
))
6425 struct elf_gc_sweep_symbol_info
*inf
;
6427 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6428 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
6431 h
->ref_regular_nonweak
= 0;
6437 /* Set up the sizes and contents of the ELF dynamic sections. This is
6438 called by the ELF linker emulation before_allocation routine. We
6439 must set the sizes of the sections before the linker sets the
6440 addresses of the various sections. */
6443 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6446 const char *filter_shlib
,
6448 const char *depaudit
,
6449 const char * const *auxiliary_filters
,
6450 struct bfd_link_info
*info
,
6451 asection
**sinterpptr
)
6454 const struct elf_backend_data
*bed
;
6458 if (!is_elf_hash_table (info
->hash
))
6461 dynobj
= elf_hash_table (info
)->dynobj
;
6463 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6465 struct bfd_elf_version_tree
*verdefs
;
6466 struct elf_info_failed asvinfo
;
6467 struct bfd_elf_version_tree
*t
;
6468 struct bfd_elf_version_expr
*d
;
6472 /* If we are supposed to export all symbols into the dynamic symbol
6473 table (this is not the normal case), then do so. */
6474 if (info
->export_dynamic
6475 || (bfd_link_executable (info
) && info
->dynamic
))
6477 struct elf_info_failed eif
;
6481 elf_link_hash_traverse (elf_hash_table (info
),
6482 _bfd_elf_export_symbol
,
6490 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6492 if (soname_indx
== (size_t) -1
6493 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6497 soname_indx
= (size_t) -1;
6499 /* Make all global versions with definition. */
6500 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6501 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6502 if (!d
->symver
&& d
->literal
)
6504 const char *verstr
, *name
;
6505 size_t namelen
, verlen
, newlen
;
6506 char *newname
, *p
, leading_char
;
6507 struct elf_link_hash_entry
*newh
;
6509 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6511 namelen
= strlen (name
) + (leading_char
!= '\0');
6513 verlen
= strlen (verstr
);
6514 newlen
= namelen
+ verlen
+ 3;
6516 newname
= (char *) bfd_malloc (newlen
);
6517 if (newname
== NULL
)
6519 newname
[0] = leading_char
;
6520 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6522 /* Check the hidden versioned definition. */
6523 p
= newname
+ namelen
;
6525 memcpy (p
, verstr
, verlen
+ 1);
6526 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6527 newname
, FALSE
, FALSE
,
6530 || (newh
->root
.type
!= bfd_link_hash_defined
6531 && newh
->root
.type
!= bfd_link_hash_defweak
))
6533 /* Check the default versioned definition. */
6535 memcpy (p
, verstr
, verlen
+ 1);
6536 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6537 newname
, FALSE
, FALSE
,
6542 /* Mark this version if there is a definition and it is
6543 not defined in a shared object. */
6545 && !newh
->def_dynamic
6546 && (newh
->root
.type
== bfd_link_hash_defined
6547 || newh
->root
.type
== bfd_link_hash_defweak
))
6551 /* Attach all the symbols to their version information. */
6552 asvinfo
.info
= info
;
6553 asvinfo
.failed
= FALSE
;
6555 elf_link_hash_traverse (elf_hash_table (info
),
6556 _bfd_elf_link_assign_sym_version
,
6561 if (!info
->allow_undefined_version
)
6563 /* Check if all global versions have a definition. */
6564 bfd_boolean all_defined
= TRUE
;
6565 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6566 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6567 if (d
->literal
&& !d
->symver
&& !d
->script
)
6570 (_("%s: undefined version: %s"),
6571 d
->pattern
, t
->name
);
6572 all_defined
= FALSE
;
6577 bfd_set_error (bfd_error_bad_value
);
6582 /* Set up the version definition section. */
6583 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6584 BFD_ASSERT (s
!= NULL
);
6586 /* We may have created additional version definitions if we are
6587 just linking a regular application. */
6588 verdefs
= info
->version_info
;
6590 /* Skip anonymous version tag. */
6591 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6592 verdefs
= verdefs
->next
;
6594 if (verdefs
== NULL
&& !info
->create_default_symver
)
6595 s
->flags
|= SEC_EXCLUDE
;
6601 Elf_Internal_Verdef def
;
6602 Elf_Internal_Verdaux defaux
;
6603 struct bfd_link_hash_entry
*bh
;
6604 struct elf_link_hash_entry
*h
;
6610 /* Make space for the base version. */
6611 size
+= sizeof (Elf_External_Verdef
);
6612 size
+= sizeof (Elf_External_Verdaux
);
6615 /* Make space for the default version. */
6616 if (info
->create_default_symver
)
6618 size
+= sizeof (Elf_External_Verdef
);
6622 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6624 struct bfd_elf_version_deps
*n
;
6626 /* Don't emit base version twice. */
6630 size
+= sizeof (Elf_External_Verdef
);
6631 size
+= sizeof (Elf_External_Verdaux
);
6634 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6635 size
+= sizeof (Elf_External_Verdaux
);
6639 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6640 if (s
->contents
== NULL
&& s
->size
!= 0)
6643 /* Fill in the version definition section. */
6647 def
.vd_version
= VER_DEF_CURRENT
;
6648 def
.vd_flags
= VER_FLG_BASE
;
6651 if (info
->create_default_symver
)
6653 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6654 def
.vd_next
= sizeof (Elf_External_Verdef
);
6658 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6659 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6660 + sizeof (Elf_External_Verdaux
));
6663 if (soname_indx
!= (size_t) -1)
6665 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6667 def
.vd_hash
= bfd_elf_hash (soname
);
6668 defaux
.vda_name
= soname_indx
;
6675 name
= lbasename (bfd_get_filename (output_bfd
));
6676 def
.vd_hash
= bfd_elf_hash (name
);
6677 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6679 if (indx
== (size_t) -1)
6681 defaux
.vda_name
= indx
;
6683 defaux
.vda_next
= 0;
6685 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6686 (Elf_External_Verdef
*) p
);
6687 p
+= sizeof (Elf_External_Verdef
);
6688 if (info
->create_default_symver
)
6690 /* Add a symbol representing this version. */
6692 if (! (_bfd_generic_link_add_one_symbol
6693 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6695 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6697 h
= (struct elf_link_hash_entry
*) bh
;
6700 h
->type
= STT_OBJECT
;
6701 h
->verinfo
.vertree
= NULL
;
6703 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6706 /* Create a duplicate of the base version with the same
6707 aux block, but different flags. */
6710 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6712 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6713 + sizeof (Elf_External_Verdaux
));
6716 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6717 (Elf_External_Verdef
*) p
);
6718 p
+= sizeof (Elf_External_Verdef
);
6720 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6721 (Elf_External_Verdaux
*) p
);
6722 p
+= sizeof (Elf_External_Verdaux
);
6724 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6727 struct bfd_elf_version_deps
*n
;
6729 /* Don't emit the base version twice. */
6734 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6737 /* Add a symbol representing this version. */
6739 if (! (_bfd_generic_link_add_one_symbol
6740 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6742 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6744 h
= (struct elf_link_hash_entry
*) bh
;
6747 h
->type
= STT_OBJECT
;
6748 h
->verinfo
.vertree
= t
;
6750 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6753 def
.vd_version
= VER_DEF_CURRENT
;
6755 if (t
->globals
.list
== NULL
6756 && t
->locals
.list
== NULL
6758 def
.vd_flags
|= VER_FLG_WEAK
;
6759 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6760 def
.vd_cnt
= cdeps
+ 1;
6761 def
.vd_hash
= bfd_elf_hash (t
->name
);
6762 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6765 /* If a basever node is next, it *must* be the last node in
6766 the chain, otherwise Verdef construction breaks. */
6767 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6768 BFD_ASSERT (t
->next
->next
== NULL
);
6770 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6771 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6772 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6774 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6775 (Elf_External_Verdef
*) p
);
6776 p
+= sizeof (Elf_External_Verdef
);
6778 defaux
.vda_name
= h
->dynstr_index
;
6779 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6781 defaux
.vda_next
= 0;
6782 if (t
->deps
!= NULL
)
6783 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6784 t
->name_indx
= defaux
.vda_name
;
6786 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6787 (Elf_External_Verdaux
*) p
);
6788 p
+= sizeof (Elf_External_Verdaux
);
6790 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6792 if (n
->version_needed
== NULL
)
6794 /* This can happen if there was an error in the
6796 defaux
.vda_name
= 0;
6800 defaux
.vda_name
= n
->version_needed
->name_indx
;
6801 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6804 if (n
->next
== NULL
)
6805 defaux
.vda_next
= 0;
6807 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6809 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6810 (Elf_External_Verdaux
*) p
);
6811 p
+= sizeof (Elf_External_Verdaux
);
6815 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6819 bed
= get_elf_backend_data (output_bfd
);
6821 if (info
->gc_sections
&& bed
->can_gc_sections
)
6823 struct elf_gc_sweep_symbol_info sweep_info
;
6825 /* Remove the symbols that were in the swept sections from the
6826 dynamic symbol table. */
6827 sweep_info
.info
= info
;
6828 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6829 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6833 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6836 struct elf_find_verdep_info sinfo
;
6838 /* Work out the size of the version reference section. */
6840 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6841 BFD_ASSERT (s
!= NULL
);
6844 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6845 if (sinfo
.vers
== 0)
6847 sinfo
.failed
= FALSE
;
6849 elf_link_hash_traverse (elf_hash_table (info
),
6850 _bfd_elf_link_find_version_dependencies
,
6855 if (elf_tdata (output_bfd
)->verref
== NULL
)
6856 s
->flags
|= SEC_EXCLUDE
;
6859 Elf_Internal_Verneed
*vn
;
6864 /* Build the version dependency section. */
6867 for (vn
= elf_tdata (output_bfd
)->verref
;
6869 vn
= vn
->vn_nextref
)
6871 Elf_Internal_Vernaux
*a
;
6873 size
+= sizeof (Elf_External_Verneed
);
6875 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6876 size
+= sizeof (Elf_External_Vernaux
);
6880 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6881 if (s
->contents
== NULL
)
6885 for (vn
= elf_tdata (output_bfd
)->verref
;
6887 vn
= vn
->vn_nextref
)
6890 Elf_Internal_Vernaux
*a
;
6894 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6897 vn
->vn_version
= VER_NEED_CURRENT
;
6899 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6900 elf_dt_name (vn
->vn_bfd
) != NULL
6901 ? elf_dt_name (vn
->vn_bfd
)
6902 : lbasename (bfd_get_filename
6905 if (indx
== (size_t) -1)
6908 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6909 if (vn
->vn_nextref
== NULL
)
6912 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6913 + caux
* sizeof (Elf_External_Vernaux
));
6915 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6916 (Elf_External_Verneed
*) p
);
6917 p
+= sizeof (Elf_External_Verneed
);
6919 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6921 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6922 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6923 a
->vna_nodename
, FALSE
);
6924 if (indx
== (size_t) -1)
6927 if (a
->vna_nextptr
== NULL
)
6930 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6932 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6933 (Elf_External_Vernaux
*) p
);
6934 p
+= sizeof (Elf_External_Vernaux
);
6938 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6942 /* Any syms created from now on start with -1 in
6943 got.refcount/offset and plt.refcount/offset. */
6944 elf_hash_table (info
)->init_got_refcount
6945 = elf_hash_table (info
)->init_got_offset
;
6946 elf_hash_table (info
)->init_plt_refcount
6947 = elf_hash_table (info
)->init_plt_offset
;
6949 if (bfd_link_relocatable (info
)
6950 && !_bfd_elf_size_group_sections (info
))
6953 /* The backend may have to create some sections regardless of whether
6954 we're dynamic or not. */
6955 if (bed
->elf_backend_always_size_sections
6956 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6959 /* Determine any GNU_STACK segment requirements, after the backend
6960 has had a chance to set a default segment size. */
6961 if (info
->execstack
)
6962 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6963 else if (info
->noexecstack
)
6964 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6968 asection
*notesec
= NULL
;
6971 for (inputobj
= info
->input_bfds
;
6973 inputobj
= inputobj
->link
.next
)
6978 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6980 s
= inputobj
->sections
;
6981 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6984 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6987 if (s
->flags
& SEC_CODE
)
6991 else if (bed
->default_execstack
)
6994 if (notesec
|| info
->stacksize
> 0)
6995 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
6996 if (notesec
&& exec
&& bfd_link_relocatable (info
)
6997 && notesec
->output_section
!= bfd_abs_section_ptr
)
6998 notesec
->output_section
->flags
|= SEC_CODE
;
7001 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7003 struct elf_info_failed eif
;
7004 struct elf_link_hash_entry
*h
;
7008 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
7009 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
7013 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
7015 info
->flags
|= DF_SYMBOLIC
;
7023 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
7025 if (indx
== (size_t) -1)
7028 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
7029 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
7033 if (filter_shlib
!= NULL
)
7037 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7038 filter_shlib
, TRUE
);
7039 if (indx
== (size_t) -1
7040 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
7044 if (auxiliary_filters
!= NULL
)
7046 const char * const *p
;
7048 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
7052 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7054 if (indx
== (size_t) -1
7055 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7064 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7066 if (indx
== (size_t) -1
7067 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7071 if (depaudit
!= NULL
)
7075 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7077 if (indx
== (size_t) -1
7078 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7085 /* Find all symbols which were defined in a dynamic object and make
7086 the backend pick a reasonable value for them. */
7087 elf_link_hash_traverse (elf_hash_table (info
),
7088 _bfd_elf_adjust_dynamic_symbol
,
7093 /* Add some entries to the .dynamic section. We fill in some of the
7094 values later, in bfd_elf_final_link, but we must add the entries
7095 now so that we know the final size of the .dynamic section. */
7097 /* If there are initialization and/or finalization functions to
7098 call then add the corresponding DT_INIT/DT_FINI entries. */
7099 h
= (info
->init_function
7100 ? elf_link_hash_lookup (elf_hash_table (info
),
7101 info
->init_function
, FALSE
,
7108 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7111 h
= (info
->fini_function
7112 ? elf_link_hash_lookup (elf_hash_table (info
),
7113 info
->fini_function
, FALSE
,
7120 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7124 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7125 if (s
!= NULL
&& s
->linker_has_input
)
7127 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7128 if (! bfd_link_executable (info
))
7133 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7134 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7135 && (o
= sub
->sections
) != NULL
7136 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7137 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7138 if (elf_section_data (o
)->this_hdr
.sh_type
7139 == SHT_PREINIT_ARRAY
)
7142 (_("%pB: .preinit_array section is not allowed in DSO"),
7147 bfd_set_error (bfd_error_nonrepresentable_section
);
7151 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7152 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7155 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7156 if (s
!= NULL
&& s
->linker_has_input
)
7158 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7159 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7162 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7163 if (s
!= NULL
&& s
->linker_has_input
)
7165 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7166 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7170 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7171 /* If .dynstr is excluded from the link, we don't want any of
7172 these tags. Strictly, we should be checking each section
7173 individually; This quick check covers for the case where
7174 someone does a /DISCARD/ : { *(*) }. */
7175 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7177 bfd_size_type strsize
;
7179 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7180 if ((info
->emit_hash
7181 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7182 || (info
->emit_gnu_hash
7183 && (bed
->record_xhash_symbol
== NULL
7184 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7185 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7186 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7187 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7188 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7190 || (info
->gnu_flags_1
7191 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_FLAGS_1
,
7192 info
->gnu_flags_1
)))
7197 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7200 /* The backend must work out the sizes of all the other dynamic
7203 && bed
->elf_backend_size_dynamic_sections
!= NULL
7204 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7207 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7209 if (elf_tdata (output_bfd
)->cverdefs
)
7211 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7213 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7214 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7218 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7220 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7223 else if (info
->flags
& DF_BIND_NOW
)
7225 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7231 if (bfd_link_executable (info
))
7232 info
->flags_1
&= ~ (DF_1_INITFIRST
7235 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7239 if (elf_tdata (output_bfd
)->cverrefs
)
7241 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7243 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7244 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7248 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7249 && elf_tdata (output_bfd
)->cverdefs
== 0)
7250 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7254 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7255 s
->flags
|= SEC_EXCLUDE
;
7261 /* Find the first non-excluded output section. We'll use its
7262 section symbol for some emitted relocs. */
7264 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7267 asection
*found
= NULL
;
7269 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7270 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7271 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7274 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7277 elf_hash_table (info
)->text_index_section
= found
;
7280 /* Find two non-excluded output sections, one for code, one for data.
7281 We'll use their section symbols for some emitted relocs. */
7283 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7286 asection
*found
= NULL
;
7288 /* Data first, since setting text_index_section changes
7289 _bfd_elf_omit_section_dynsym_default. */
7290 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7291 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7292 && !(s
->flags
& SEC_READONLY
)
7293 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7296 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7299 elf_hash_table (info
)->data_index_section
= found
;
7301 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7302 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7303 && (s
->flags
& SEC_READONLY
)
7304 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7309 elf_hash_table (info
)->text_index_section
= found
;
7312 #define GNU_HASH_SECTION_NAME(bed) \
7313 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7316 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7318 const struct elf_backend_data
*bed
;
7319 unsigned long section_sym_count
;
7320 bfd_size_type dynsymcount
= 0;
7322 if (!is_elf_hash_table (info
->hash
))
7325 bed
= get_elf_backend_data (output_bfd
);
7326 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7328 /* Assign dynsym indices. In a shared library we generate a section
7329 symbol for each output section, which come first. Next come all
7330 of the back-end allocated local dynamic syms, followed by the rest
7331 of the global symbols.
7333 This is usually not needed for static binaries, however backends
7334 can request to always do it, e.g. the MIPS backend uses dynamic
7335 symbol counts to lay out GOT, which will be produced in the
7336 presence of GOT relocations even in static binaries (holding fixed
7337 data in that case, to satisfy those relocations). */
7339 if (elf_hash_table (info
)->dynamic_sections_created
7340 || bed
->always_renumber_dynsyms
)
7341 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7342 §ion_sym_count
);
7344 if (elf_hash_table (info
)->dynamic_sections_created
)
7348 unsigned int dtagcount
;
7350 dynobj
= elf_hash_table (info
)->dynobj
;
7352 /* Work out the size of the symbol version section. */
7353 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7354 BFD_ASSERT (s
!= NULL
);
7355 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7357 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7358 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7359 if (s
->contents
== NULL
)
7362 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7366 /* Set the size of the .dynsym and .hash sections. We counted
7367 the number of dynamic symbols in elf_link_add_object_symbols.
7368 We will build the contents of .dynsym and .hash when we build
7369 the final symbol table, because until then we do not know the
7370 correct value to give the symbols. We built the .dynstr
7371 section as we went along in elf_link_add_object_symbols. */
7372 s
= elf_hash_table (info
)->dynsym
;
7373 BFD_ASSERT (s
!= NULL
);
7374 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7376 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7377 if (s
->contents
== NULL
)
7380 /* The first entry in .dynsym is a dummy symbol. Clear all the
7381 section syms, in case we don't output them all. */
7382 ++section_sym_count
;
7383 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7385 elf_hash_table (info
)->bucketcount
= 0;
7387 /* Compute the size of the hashing table. As a side effect this
7388 computes the hash values for all the names we export. */
7389 if (info
->emit_hash
)
7391 unsigned long int *hashcodes
;
7392 struct hash_codes_info hashinf
;
7394 unsigned long int nsyms
;
7396 size_t hash_entry_size
;
7398 /* Compute the hash values for all exported symbols. At the same
7399 time store the values in an array so that we could use them for
7401 amt
= dynsymcount
* sizeof (unsigned long int);
7402 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7403 if (hashcodes
== NULL
)
7405 hashinf
.hashcodes
= hashcodes
;
7406 hashinf
.error
= FALSE
;
7408 /* Put all hash values in HASHCODES. */
7409 elf_link_hash_traverse (elf_hash_table (info
),
7410 elf_collect_hash_codes
, &hashinf
);
7417 nsyms
= hashinf
.hashcodes
- hashcodes
;
7419 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7422 if (bucketcount
== 0 && nsyms
> 0)
7425 elf_hash_table (info
)->bucketcount
= bucketcount
;
7427 s
= bfd_get_linker_section (dynobj
, ".hash");
7428 BFD_ASSERT (s
!= NULL
);
7429 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7430 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7431 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7432 if (s
->contents
== NULL
)
7435 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7436 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7437 s
->contents
+ hash_entry_size
);
7440 if (info
->emit_gnu_hash
)
7443 unsigned char *contents
;
7444 struct collect_gnu_hash_codes cinfo
;
7448 memset (&cinfo
, 0, sizeof (cinfo
));
7450 /* Compute the hash values for all exported symbols. At the same
7451 time store the values in an array so that we could use them for
7453 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7454 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7455 if (cinfo
.hashcodes
== NULL
)
7458 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7459 cinfo
.min_dynindx
= -1;
7460 cinfo
.output_bfd
= output_bfd
;
7463 /* Put all hash values in HASHCODES. */
7464 elf_link_hash_traverse (elf_hash_table (info
),
7465 elf_collect_gnu_hash_codes
, &cinfo
);
7468 free (cinfo
.hashcodes
);
7473 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7475 if (bucketcount
== 0)
7477 free (cinfo
.hashcodes
);
7481 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7482 BFD_ASSERT (s
!= NULL
);
7484 if (cinfo
.nsyms
== 0)
7486 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7487 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7488 free (cinfo
.hashcodes
);
7489 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7490 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7491 if (contents
== NULL
)
7493 s
->contents
= contents
;
7494 /* 1 empty bucket. */
7495 bfd_put_32 (output_bfd
, 1, contents
);
7496 /* SYMIDX above the special symbol 0. */
7497 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7498 /* Just one word for bitmask. */
7499 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7500 /* Only hash fn bloom filter. */
7501 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7502 /* No hashes are valid - empty bitmask. */
7503 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7504 /* No hashes in the only bucket. */
7505 bfd_put_32 (output_bfd
, 0,
7506 contents
+ 16 + bed
->s
->arch_size
/ 8);
7510 unsigned long int maskwords
, maskbitslog2
, x
;
7511 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7515 while ((x
>>= 1) != 0)
7517 if (maskbitslog2
< 3)
7519 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7520 maskbitslog2
= maskbitslog2
+ 3;
7522 maskbitslog2
= maskbitslog2
+ 2;
7523 if (bed
->s
->arch_size
== 64)
7525 if (maskbitslog2
== 5)
7531 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7532 cinfo
.shift2
= maskbitslog2
;
7533 cinfo
.maskbits
= 1 << maskbitslog2
;
7534 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7535 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7536 amt
+= maskwords
* sizeof (bfd_vma
);
7537 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7538 if (cinfo
.bitmask
== NULL
)
7540 free (cinfo
.hashcodes
);
7544 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7545 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7546 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7547 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7549 /* Determine how often each hash bucket is used. */
7550 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7551 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7552 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7554 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7555 if (cinfo
.counts
[i
] != 0)
7557 cinfo
.indx
[i
] = cnt
;
7558 cnt
+= cinfo
.counts
[i
];
7560 BFD_ASSERT (cnt
== dynsymcount
);
7561 cinfo
.bucketcount
= bucketcount
;
7562 cinfo
.local_indx
= cinfo
.min_dynindx
;
7564 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7565 s
->size
+= cinfo
.maskbits
/ 8;
7566 if (bed
->record_xhash_symbol
!= NULL
)
7567 s
->size
+= cinfo
.nsyms
* 4;
7568 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7569 if (contents
== NULL
)
7571 free (cinfo
.bitmask
);
7572 free (cinfo
.hashcodes
);
7576 s
->contents
= contents
;
7577 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7578 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7579 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7580 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7581 contents
+= 16 + cinfo
.maskbits
/ 8;
7583 for (i
= 0; i
< bucketcount
; ++i
)
7585 if (cinfo
.counts
[i
] == 0)
7586 bfd_put_32 (output_bfd
, 0, contents
);
7588 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7592 cinfo
.contents
= contents
;
7594 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7595 /* Renumber dynamic symbols, if populating .gnu.hash section.
7596 If using .MIPS.xhash, populate the translation table. */
7597 elf_link_hash_traverse (elf_hash_table (info
),
7598 elf_gnu_hash_process_symidx
, &cinfo
);
7600 contents
= s
->contents
+ 16;
7601 for (i
= 0; i
< maskwords
; ++i
)
7603 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7605 contents
+= bed
->s
->arch_size
/ 8;
7608 free (cinfo
.bitmask
);
7609 free (cinfo
.hashcodes
);
7613 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7614 BFD_ASSERT (s
!= NULL
);
7616 elf_finalize_dynstr (output_bfd
, info
);
7618 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7620 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7621 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7628 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7631 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7634 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7635 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7638 /* Finish SHF_MERGE section merging. */
7641 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7646 if (!is_elf_hash_table (info
->hash
))
7649 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7650 if ((ibfd
->flags
& DYNAMIC
) == 0
7651 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7652 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7653 == get_elf_backend_data (obfd
)->s
->elfclass
))
7654 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7655 if ((sec
->flags
& SEC_MERGE
) != 0
7656 && !bfd_is_abs_section (sec
->output_section
))
7658 struct bfd_elf_section_data
*secdata
;
7660 secdata
= elf_section_data (sec
);
7661 if (! _bfd_add_merge_section (obfd
,
7662 &elf_hash_table (info
)->merge_info
,
7663 sec
, &secdata
->sec_info
))
7665 else if (secdata
->sec_info
)
7666 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7669 if (elf_hash_table (info
)->merge_info
!= NULL
)
7670 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7671 merge_sections_remove_hook
);
7675 /* Create an entry in an ELF linker hash table. */
7677 struct bfd_hash_entry
*
7678 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7679 struct bfd_hash_table
*table
,
7682 /* Allocate the structure if it has not already been allocated by a
7686 entry
= (struct bfd_hash_entry
*)
7687 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7692 /* Call the allocation method of the superclass. */
7693 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7696 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7697 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7699 /* Set local fields. */
7702 ret
->got
= htab
->init_got_refcount
;
7703 ret
->plt
= htab
->init_plt_refcount
;
7704 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7705 - offsetof (struct elf_link_hash_entry
, size
)));
7706 /* Assume that we have been called by a non-ELF symbol reader.
7707 This flag is then reset by the code which reads an ELF input
7708 file. This ensures that a symbol created by a non-ELF symbol
7709 reader will have the flag set correctly. */
7716 /* Copy data from an indirect symbol to its direct symbol, hiding the
7717 old indirect symbol. Also used for copying flags to a weakdef. */
7720 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7721 struct elf_link_hash_entry
*dir
,
7722 struct elf_link_hash_entry
*ind
)
7724 struct elf_link_hash_table
*htab
;
7726 if (ind
->dyn_relocs
!= NULL
)
7728 if (dir
->dyn_relocs
!= NULL
)
7730 struct elf_dyn_relocs
**pp
;
7731 struct elf_dyn_relocs
*p
;
7733 /* Add reloc counts against the indirect sym to the direct sym
7734 list. Merge any entries against the same section. */
7735 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7737 struct elf_dyn_relocs
*q
;
7739 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7740 if (q
->sec
== p
->sec
)
7742 q
->pc_count
+= p
->pc_count
;
7743 q
->count
+= p
->count
;
7750 *pp
= dir
->dyn_relocs
;
7753 dir
->dyn_relocs
= ind
->dyn_relocs
;
7754 ind
->dyn_relocs
= NULL
;
7757 /* Copy down any references that we may have already seen to the
7758 symbol which just became indirect. */
7760 if (dir
->versioned
!= versioned_hidden
)
7761 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7762 dir
->ref_regular
|= ind
->ref_regular
;
7763 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7764 dir
->non_got_ref
|= ind
->non_got_ref
;
7765 dir
->needs_plt
|= ind
->needs_plt
;
7766 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7768 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7771 /* Copy over the global and procedure linkage table refcount entries.
7772 These may have been already set up by a check_relocs routine. */
7773 htab
= elf_hash_table (info
);
7774 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7776 if (dir
->got
.refcount
< 0)
7777 dir
->got
.refcount
= 0;
7778 dir
->got
.refcount
+= ind
->got
.refcount
;
7779 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7782 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7784 if (dir
->plt
.refcount
< 0)
7785 dir
->plt
.refcount
= 0;
7786 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7787 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7790 if (ind
->dynindx
!= -1)
7792 if (dir
->dynindx
!= -1)
7793 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7794 dir
->dynindx
= ind
->dynindx
;
7795 dir
->dynstr_index
= ind
->dynstr_index
;
7797 ind
->dynstr_index
= 0;
7802 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7803 struct elf_link_hash_entry
*h
,
7804 bfd_boolean force_local
)
7806 /* STT_GNU_IFUNC symbol must go through PLT. */
7807 if (h
->type
!= STT_GNU_IFUNC
)
7809 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7814 h
->forced_local
= 1;
7815 if (h
->dynindx
!= -1)
7817 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7820 h
->dynstr_index
= 0;
7825 /* Hide a symbol. */
7828 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7829 struct bfd_link_info
*info
,
7830 struct bfd_link_hash_entry
*h
)
7832 if (is_elf_hash_table (info
->hash
))
7834 const struct elf_backend_data
*bed
7835 = get_elf_backend_data (output_bfd
);
7836 struct elf_link_hash_entry
*eh
7837 = (struct elf_link_hash_entry
*) h
;
7838 bed
->elf_backend_hide_symbol (info
, eh
, TRUE
);
7839 eh
->def_dynamic
= 0;
7840 eh
->ref_dynamic
= 0;
7841 eh
->dynamic_def
= 0;
7845 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7849 _bfd_elf_link_hash_table_init
7850 (struct elf_link_hash_table
*table
,
7852 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7853 struct bfd_hash_table
*,
7855 unsigned int entsize
,
7856 enum elf_target_id target_id
)
7859 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7861 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7862 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7863 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7864 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7865 /* The first dynamic symbol is a dummy. */
7866 table
->dynsymcount
= 1;
7868 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7870 table
->root
.type
= bfd_link_elf_hash_table
;
7871 table
->hash_table_id
= target_id
;
7872 table
->target_os
= get_elf_backend_data (abfd
)->target_os
;
7877 /* Create an ELF linker hash table. */
7879 struct bfd_link_hash_table
*
7880 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7882 struct elf_link_hash_table
*ret
;
7883 size_t amt
= sizeof (struct elf_link_hash_table
);
7885 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7889 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7890 sizeof (struct elf_link_hash_entry
),
7896 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7901 /* Destroy an ELF linker hash table. */
7904 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7906 struct elf_link_hash_table
*htab
;
7908 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7909 if (htab
->dynstr
!= NULL
)
7910 _bfd_elf_strtab_free (htab
->dynstr
);
7911 _bfd_merge_sections_free (htab
->merge_info
);
7912 _bfd_generic_link_hash_table_free (obfd
);
7915 /* This is a hook for the ELF emulation code in the generic linker to
7916 tell the backend linker what file name to use for the DT_NEEDED
7917 entry for a dynamic object. */
7920 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7922 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7923 && bfd_get_format (abfd
) == bfd_object
)
7924 elf_dt_name (abfd
) = name
;
7928 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7931 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7932 && bfd_get_format (abfd
) == bfd_object
)
7933 lib_class
= elf_dyn_lib_class (abfd
);
7940 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7942 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7943 && bfd_get_format (abfd
) == bfd_object
)
7944 elf_dyn_lib_class (abfd
) = lib_class
;
7947 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7948 the linker ELF emulation code. */
7950 struct bfd_link_needed_list
*
7951 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7952 struct bfd_link_info
*info
)
7954 if (! is_elf_hash_table (info
->hash
))
7956 return elf_hash_table (info
)->needed
;
7959 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7960 hook for the linker ELF emulation code. */
7962 struct bfd_link_needed_list
*
7963 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7964 struct bfd_link_info
*info
)
7966 if (! is_elf_hash_table (info
->hash
))
7968 return elf_hash_table (info
)->runpath
;
7971 /* Get the name actually used for a dynamic object for a link. This
7972 is the SONAME entry if there is one. Otherwise, it is the string
7973 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7976 bfd_elf_get_dt_soname (bfd
*abfd
)
7978 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7979 && bfd_get_format (abfd
) == bfd_object
)
7980 return elf_dt_name (abfd
);
7984 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7985 the ELF linker emulation code. */
7988 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7989 struct bfd_link_needed_list
**pneeded
)
7992 bfd_byte
*dynbuf
= NULL
;
7993 unsigned int elfsec
;
7994 unsigned long shlink
;
7995 bfd_byte
*extdyn
, *extdynend
;
7997 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
8001 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
8002 || bfd_get_format (abfd
) != bfd_object
)
8005 s
= bfd_get_section_by_name (abfd
, ".dynamic");
8006 if (s
== NULL
|| s
->size
== 0)
8009 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
8012 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
8013 if (elfsec
== SHN_BAD
)
8016 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
8018 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
8019 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
8022 extdynend
= extdyn
+ s
->size
;
8023 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
8025 Elf_Internal_Dyn dyn
;
8027 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
8029 if (dyn
.d_tag
== DT_NULL
)
8032 if (dyn
.d_tag
== DT_NEEDED
)
8035 struct bfd_link_needed_list
*l
;
8036 unsigned int tagv
= dyn
.d_un
.d_val
;
8039 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
8044 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
8064 struct elf_symbuf_symbol
8066 unsigned long st_name
; /* Symbol name, index in string tbl */
8067 unsigned char st_info
; /* Type and binding attributes */
8068 unsigned char st_other
; /* Visibilty, and target specific */
8071 struct elf_symbuf_head
8073 struct elf_symbuf_symbol
*ssym
;
8075 unsigned int st_shndx
;
8082 Elf_Internal_Sym
*isym
;
8083 struct elf_symbuf_symbol
*ssym
;
8089 /* Sort references to symbols by ascending section number. */
8092 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8094 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8095 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8097 if (s1
->st_shndx
!= s2
->st_shndx
)
8098 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8099 /* Final sort by the address of the sym in the symbuf ensures
8102 return s1
> s2
? 1 : -1;
8107 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8109 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8110 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8111 int ret
= strcmp (s1
->name
, s2
->name
);
8114 if (s1
->u
.p
!= s2
->u
.p
)
8115 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8119 static struct elf_symbuf_head
*
8120 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8122 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8123 struct elf_symbuf_symbol
*ssym
;
8124 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8125 size_t i
, shndx_count
, total_size
, amt
;
8127 amt
= symcount
* sizeof (*indbuf
);
8128 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8132 /* NB: When checking if 2 sections define the same set of local and
8133 global symbols, ignore both undefined and section symbols in the
8135 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8136 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
8137 && ELF_ST_TYPE (isymbuf
[i
].st_info
) != STT_SECTION
)
8138 *ind
++ = &isymbuf
[i
];
8141 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8142 elf_sort_elf_symbol
);
8145 if (indbufend
> indbuf
)
8146 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8147 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8150 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8151 + (indbufend
- indbuf
) * sizeof (*ssym
));
8152 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8153 if (ssymbuf
== NULL
)
8159 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8160 ssymbuf
->ssym
= NULL
;
8161 ssymbuf
->count
= shndx_count
;
8162 ssymbuf
->st_shndx
= 0;
8163 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8165 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8168 ssymhead
->ssym
= ssym
;
8169 ssymhead
->count
= 0;
8170 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8172 ssym
->st_name
= (*ind
)->st_name
;
8173 ssym
->st_info
= (*ind
)->st_info
;
8174 ssym
->st_other
= (*ind
)->st_other
;
8177 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8178 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
8185 /* Check if 2 sections define the same set of local and global
8189 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8190 struct bfd_link_info
*info
)
8193 const struct elf_backend_data
*bed1
, *bed2
;
8194 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8195 size_t symcount1
, symcount2
;
8196 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8197 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8198 Elf_Internal_Sym
*isym
, *isymend
;
8199 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8200 size_t count1
, count2
, i
;
8201 unsigned int shndx1
, shndx2
;
8207 /* Both sections have to be in ELF. */
8208 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8209 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8212 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8215 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8216 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8217 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8220 bed1
= get_elf_backend_data (bfd1
);
8221 bed2
= get_elf_backend_data (bfd2
);
8222 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8223 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8224 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8225 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8227 if (symcount1
== 0 || symcount2
== 0)
8233 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8234 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8236 if (ssymbuf1
== NULL
)
8238 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8240 if (isymbuf1
== NULL
)
8243 if (info
!= NULL
&& !info
->reduce_memory_overheads
)
8245 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8246 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8250 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8252 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8254 if (isymbuf2
== NULL
)
8257 if (ssymbuf1
!= NULL
&& info
!= NULL
&& !info
->reduce_memory_overheads
)
8259 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8260 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8264 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8266 /* Optimized faster version. */
8268 struct elf_symbol
*symp
;
8269 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8272 hi
= ssymbuf1
->count
;
8277 mid
= (lo
+ hi
) / 2;
8278 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8280 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8284 count1
= ssymbuf1
[mid
].count
;
8291 hi
= ssymbuf2
->count
;
8296 mid
= (lo
+ hi
) / 2;
8297 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8299 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8303 count2
= ssymbuf2
[mid
].count
;
8309 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8313 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8315 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8316 if (symtable1
== NULL
|| symtable2
== NULL
)
8320 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
8321 ssym
< ssymend
; ssym
++, symp
++)
8323 symp
->u
.ssym
= ssym
;
8324 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8330 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
8331 ssym
< ssymend
; ssym
++, symp
++)
8333 symp
->u
.ssym
= ssym
;
8334 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8339 /* Sort symbol by name. */
8340 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8341 elf_sym_name_compare
);
8342 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8343 elf_sym_name_compare
);
8345 for (i
= 0; i
< count1
; i
++)
8346 /* Two symbols must have the same binding, type and name. */
8347 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8348 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8349 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8356 symtable1
= (struct elf_symbol
*)
8357 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8358 symtable2
= (struct elf_symbol
*)
8359 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8360 if (symtable1
== NULL
|| symtable2
== NULL
)
8363 /* Count definitions in the section. */
8365 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8366 if (isym
->st_shndx
== shndx1
)
8367 symtable1
[count1
++].u
.isym
= isym
;
8370 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8371 if (isym
->st_shndx
== shndx2
)
8372 symtable2
[count2
++].u
.isym
= isym
;
8374 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8377 for (i
= 0; i
< count1
; i
++)
8379 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8380 symtable1
[i
].u
.isym
->st_name
);
8382 for (i
= 0; i
< count2
; i
++)
8384 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8385 symtable2
[i
].u
.isym
->st_name
);
8387 /* Sort symbol by name. */
8388 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8389 elf_sym_name_compare
);
8390 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8391 elf_sym_name_compare
);
8393 for (i
= 0; i
< count1
; i
++)
8394 /* Two symbols must have the same binding, type and name. */
8395 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8396 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8397 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8411 /* Return TRUE if 2 section types are compatible. */
8414 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8415 bfd
*bbfd
, const asection
*bsec
)
8419 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8420 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8423 return elf_section_type (asec
) == elf_section_type (bsec
);
8426 /* Final phase of ELF linker. */
8428 /* A structure we use to avoid passing large numbers of arguments. */
8430 struct elf_final_link_info
8432 /* General link information. */
8433 struct bfd_link_info
*info
;
8436 /* Symbol string table. */
8437 struct elf_strtab_hash
*symstrtab
;
8438 /* .hash section. */
8440 /* symbol version section (.gnu.version). */
8441 asection
*symver_sec
;
8442 /* Buffer large enough to hold contents of any section. */
8444 /* Buffer large enough to hold external relocs of any section. */
8445 void *external_relocs
;
8446 /* Buffer large enough to hold internal relocs of any section. */
8447 Elf_Internal_Rela
*internal_relocs
;
8448 /* Buffer large enough to hold external local symbols of any input
8450 bfd_byte
*external_syms
;
8451 /* And a buffer for symbol section indices. */
8452 Elf_External_Sym_Shndx
*locsym_shndx
;
8453 /* Buffer large enough to hold internal local symbols of any input
8455 Elf_Internal_Sym
*internal_syms
;
8456 /* Array large enough to hold a symbol index for each local symbol
8457 of any input BFD. */
8459 /* Array large enough to hold a section pointer for each local
8460 symbol of any input BFD. */
8461 asection
**sections
;
8462 /* Buffer for SHT_SYMTAB_SHNDX section. */
8463 Elf_External_Sym_Shndx
*symshndxbuf
;
8464 /* Number of STT_FILE syms seen. */
8465 size_t filesym_count
;
8466 /* Local symbol hash table. */
8467 struct bfd_hash_table local_hash_table
;
8470 struct local_hash_entry
8472 /* Base hash table entry structure. */
8473 struct bfd_hash_entry root
;
8474 /* Size of the local symbol name. */
8476 /* Number of the duplicated local symbol names. */
8480 /* Create an entry in the local symbol hash table. */
8482 static struct bfd_hash_entry
*
8483 local_hash_newfunc (struct bfd_hash_entry
*entry
,
8484 struct bfd_hash_table
*table
,
8488 /* Allocate the structure if it has not already been allocated by a
8492 entry
= bfd_hash_allocate (table
,
8493 sizeof (struct local_hash_entry
));
8498 /* Call the allocation method of the superclass. */
8499 entry
= bfd_hash_newfunc (entry
, table
, string
);
8502 ((struct local_hash_entry
*) entry
)->count
= 0;
8503 ((struct local_hash_entry
*) entry
)->size
= 0;
8509 /* This struct is used to pass information to elf_link_output_extsym. */
8511 struct elf_outext_info
8514 bfd_boolean localsyms
;
8515 bfd_boolean file_sym_done
;
8516 struct elf_final_link_info
*flinfo
;
8520 /* Support for evaluating a complex relocation.
8522 Complex relocations are generalized, self-describing relocations. The
8523 implementation of them consists of two parts: complex symbols, and the
8524 relocations themselves.
8526 The relocations use a reserved elf-wide relocation type code (R_RELC
8527 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8528 information (start bit, end bit, word width, etc) into the addend. This
8529 information is extracted from CGEN-generated operand tables within gas.
8531 Complex symbols are mangled symbols (STT_RELC external / BSF_RELC
8532 internal) representing prefix-notation expressions, including but not
8533 limited to those sorts of expressions normally encoded as addends in the
8534 addend field. The symbol mangling format is:
8537 | <unary-operator> ':' <node>
8538 | <binary-operator> ':' <node> ':' <node>
8541 <literal> := 's' <digits=N> ':' <N character symbol name>
8542 | 'S' <digits=N> ':' <N character section name>
8546 <binary-operator> := as in C
8547 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8550 set_symbol_value (bfd
*bfd_with_globals
,
8551 Elf_Internal_Sym
*isymbuf
,
8556 struct elf_link_hash_entry
**sym_hashes
;
8557 struct elf_link_hash_entry
*h
;
8558 size_t extsymoff
= locsymcount
;
8560 if (symidx
< locsymcount
)
8562 Elf_Internal_Sym
*sym
;
8564 sym
= isymbuf
+ symidx
;
8565 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8567 /* It is a local symbol: move it to the
8568 "absolute" section and give it a value. */
8569 sym
->st_shndx
= SHN_ABS
;
8570 sym
->st_value
= val
;
8573 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8577 /* It is a global symbol: set its link type
8578 to "defined" and give it a value. */
8580 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8581 h
= sym_hashes
[symidx
- extsymoff
];
8582 while (h
->root
.type
== bfd_link_hash_indirect
8583 || h
->root
.type
== bfd_link_hash_warning
)
8584 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8585 h
->root
.type
= bfd_link_hash_defined
;
8586 h
->root
.u
.def
.value
= val
;
8587 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8591 resolve_symbol (const char *name
,
8593 struct elf_final_link_info
*flinfo
,
8595 Elf_Internal_Sym
*isymbuf
,
8598 Elf_Internal_Sym
*sym
;
8599 struct bfd_link_hash_entry
*global_entry
;
8600 const char *candidate
= NULL
;
8601 Elf_Internal_Shdr
*symtab_hdr
;
8604 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8606 for (i
= 0; i
< locsymcount
; ++ i
)
8610 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8613 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8614 symtab_hdr
->sh_link
,
8617 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8618 name
, candidate
, (unsigned long) sym
->st_value
);
8620 if (candidate
&& strcmp (candidate
, name
) == 0)
8622 asection
*sec
= flinfo
->sections
[i
];
8624 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8625 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8627 printf ("Found symbol with value %8.8lx\n",
8628 (unsigned long) *result
);
8634 /* Hmm, haven't found it yet. perhaps it is a global. */
8635 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8636 FALSE
, FALSE
, TRUE
);
8640 if (global_entry
->type
== bfd_link_hash_defined
8641 || global_entry
->type
== bfd_link_hash_defweak
)
8643 *result
= (global_entry
->u
.def
.value
8644 + global_entry
->u
.def
.section
->output_section
->vma
8645 + global_entry
->u
.def
.section
->output_offset
);
8647 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8648 global_entry
->root
.string
, (unsigned long) *result
);
8656 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8657 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8658 names like "foo.end" which is the end address of section "foo". */
8661 resolve_section (const char *name
,
8669 for (curr
= sections
; curr
; curr
= curr
->next
)
8670 if (strcmp (curr
->name
, name
) == 0)
8672 *result
= curr
->vma
;
8676 /* Hmm. still haven't found it. try pseudo-section names. */
8677 /* FIXME: This could be coded more efficiently... */
8678 for (curr
= sections
; curr
; curr
= curr
->next
)
8680 len
= strlen (curr
->name
);
8681 if (len
> strlen (name
))
8684 if (strncmp (curr
->name
, name
, len
) == 0)
8686 if (strncmp (".end", name
+ len
, 4) == 0)
8688 *result
= (curr
->vma
8689 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8693 /* Insert more pseudo-section names here, if you like. */
8701 undefined_reference (const char *reftype
, const char *name
)
8703 /* xgettext:c-format */
8704 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8706 bfd_set_error (bfd_error_bad_value
);
8710 eval_symbol (bfd_vma
*result
,
8713 struct elf_final_link_info
*flinfo
,
8715 Elf_Internal_Sym
*isymbuf
,
8724 const char *sym
= *symp
;
8726 bfd_boolean symbol_is_section
= FALSE
;
8731 if (len
< 1 || len
> sizeof (symbuf
))
8733 bfd_set_error (bfd_error_invalid_operation
);
8746 *result
= strtoul (sym
, (char **) symp
, 16);
8750 symbol_is_section
= TRUE
;
8754 symlen
= strtol (sym
, (char **) symp
, 10);
8755 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8757 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8759 bfd_set_error (bfd_error_invalid_operation
);
8763 memcpy (symbuf
, sym
, symlen
);
8764 symbuf
[symlen
] = '\0';
8765 *symp
= sym
+ symlen
;
8767 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8768 the symbol as a section, or vice-versa. so we're pretty liberal in our
8769 interpretation here; section means "try section first", not "must be a
8770 section", and likewise with symbol. */
8772 if (symbol_is_section
)
8774 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8775 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8776 isymbuf
, locsymcount
))
8778 undefined_reference ("section", symbuf
);
8784 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8785 isymbuf
, locsymcount
)
8786 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8789 undefined_reference ("symbol", symbuf
);
8796 /* All that remains are operators. */
8798 #define UNARY_OP(op) \
8799 if (strncmp (sym, #op, strlen (#op)) == 0) \
8801 sym += strlen (#op); \
8805 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8806 isymbuf, locsymcount, signed_p)) \
8809 *result = op ((bfd_signed_vma) a); \
8815 #define BINARY_OP_HEAD(op) \
8816 if (strncmp (sym, #op, strlen (#op)) == 0) \
8818 sym += strlen (#op); \
8822 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8823 isymbuf, locsymcount, signed_p)) \
8826 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8827 isymbuf, locsymcount, signed_p)) \
8829 #define BINARY_OP_TAIL(op) \
8831 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8836 #define BINARY_OP(op) BINARY_OP_HEAD(op) BINARY_OP_TAIL(op)
8840 BINARY_OP_HEAD (<<);
8841 if (b
>= sizeof (a
) * CHAR_BIT
)
8847 BINARY_OP_TAIL (<<);
8848 BINARY_OP_HEAD (>>);
8849 if (b
>= sizeof (a
) * CHAR_BIT
)
8851 *result
= signed_p
&& (bfd_signed_vma
) a
< 0 ? -1 : 0;
8854 BINARY_OP_TAIL (>>);
8867 _bfd_error_handler (_("division by zero"));
8868 bfd_set_error (bfd_error_bad_value
);
8875 _bfd_error_handler (_("division by zero"));
8876 bfd_set_error (bfd_error_bad_value
);
8889 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8890 bfd_set_error (bfd_error_invalid_operation
);
8896 put_value (bfd_vma size
,
8897 unsigned long chunksz
,
8902 location
+= (size
- chunksz
);
8904 for (; size
; size
-= chunksz
, location
-= chunksz
)
8909 bfd_put_8 (input_bfd
, x
, location
);
8913 bfd_put_16 (input_bfd
, x
, location
);
8917 bfd_put_32 (input_bfd
, x
, location
);
8918 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8924 bfd_put_64 (input_bfd
, x
, location
);
8925 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8938 get_value (bfd_vma size
,
8939 unsigned long chunksz
,
8946 /* Sanity checks. */
8947 BFD_ASSERT (chunksz
<= sizeof (x
)
8950 && (size
% chunksz
) == 0
8951 && input_bfd
!= NULL
8952 && location
!= NULL
);
8954 if (chunksz
== sizeof (x
))
8956 BFD_ASSERT (size
== chunksz
);
8958 /* Make sure that we do not perform an undefined shift operation.
8959 We know that size == chunksz so there will only be one iteration
8960 of the loop below. */
8964 shift
= 8 * chunksz
;
8966 for (; size
; size
-= chunksz
, location
+= chunksz
)
8971 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
8974 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
8977 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
8981 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
8992 decode_complex_addend (unsigned long *start
, /* in bits */
8993 unsigned long *oplen
, /* in bits */
8994 unsigned long *len
, /* in bits */
8995 unsigned long *wordsz
, /* in bytes */
8996 unsigned long *chunksz
, /* in bytes */
8997 unsigned long *lsb0_p
,
8998 unsigned long *signed_p
,
8999 unsigned long *trunc_p
,
9000 unsigned long encoded
)
9002 * start
= encoded
& 0x3F;
9003 * len
= (encoded
>> 6) & 0x3F;
9004 * oplen
= (encoded
>> 12) & 0x3F;
9005 * wordsz
= (encoded
>> 18) & 0xF;
9006 * chunksz
= (encoded
>> 22) & 0xF;
9007 * lsb0_p
= (encoded
>> 27) & 1;
9008 * signed_p
= (encoded
>> 28) & 1;
9009 * trunc_p
= (encoded
>> 29) & 1;
9012 bfd_reloc_status_type
9013 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
9014 asection
*input_section
,
9016 Elf_Internal_Rela
*rel
,
9019 bfd_vma shift
, x
, mask
;
9020 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
9021 bfd_reloc_status_type r
;
9022 bfd_size_type octets
;
9024 /* Perform this reloc, since it is complex.
9025 (this is not to say that it necessarily refers to a complex
9026 symbol; merely that it is a self-describing CGEN based reloc.
9027 i.e. the addend has the complete reloc information (bit start, end,
9028 word size, etc) encoded within it.). */
9030 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
9031 &chunksz
, &lsb0_p
, &signed_p
,
9032 &trunc_p
, rel
->r_addend
);
9034 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
9037 shift
= (start
+ 1) - len
;
9039 shift
= (8 * wordsz
) - (start
+ len
);
9041 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
9042 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
9045 printf ("Doing complex reloc: "
9046 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
9047 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
9048 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
9049 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
9050 oplen
, (unsigned long) x
, (unsigned long) mask
,
9051 (unsigned long) relocation
);
9056 /* Now do an overflow check. */
9057 r
= bfd_check_overflow ((signed_p
9058 ? complain_overflow_signed
9059 : complain_overflow_unsigned
),
9060 len
, 0, (8 * wordsz
),
9064 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
9067 printf (" relocation: %8.8lx\n"
9068 " shifted mask: %8.8lx\n"
9069 " shifted/masked reloc: %8.8lx\n"
9070 " result: %8.8lx\n",
9071 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
9072 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
9074 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
9078 /* Functions to read r_offset from external (target order) reloc
9079 entry. Faster than bfd_getl32 et al, because we let the compiler
9080 know the value is aligned. */
9083 ext32l_r_offset (const void *p
)
9090 const union aligned32
*a
9091 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9093 uint32_t aval
= ( (uint32_t) a
->c
[0]
9094 | (uint32_t) a
->c
[1] << 8
9095 | (uint32_t) a
->c
[2] << 16
9096 | (uint32_t) a
->c
[3] << 24);
9101 ext32b_r_offset (const void *p
)
9108 const union aligned32
*a
9109 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9111 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
9112 | (uint32_t) a
->c
[1] << 16
9113 | (uint32_t) a
->c
[2] << 8
9114 | (uint32_t) a
->c
[3]);
9118 #ifdef BFD_HOST_64_BIT
9120 ext64l_r_offset (const void *p
)
9127 const union aligned64
*a
9128 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9130 uint64_t aval
= ( (uint64_t) a
->c
[0]
9131 | (uint64_t) a
->c
[1] << 8
9132 | (uint64_t) a
->c
[2] << 16
9133 | (uint64_t) a
->c
[3] << 24
9134 | (uint64_t) a
->c
[4] << 32
9135 | (uint64_t) a
->c
[5] << 40
9136 | (uint64_t) a
->c
[6] << 48
9137 | (uint64_t) a
->c
[7] << 56);
9142 ext64b_r_offset (const void *p
)
9149 const union aligned64
*a
9150 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9152 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9153 | (uint64_t) a
->c
[1] << 48
9154 | (uint64_t) a
->c
[2] << 40
9155 | (uint64_t) a
->c
[3] << 32
9156 | (uint64_t) a
->c
[4] << 24
9157 | (uint64_t) a
->c
[5] << 16
9158 | (uint64_t) a
->c
[6] << 8
9159 | (uint64_t) a
->c
[7]);
9164 /* When performing a relocatable link, the input relocations are
9165 preserved. But, if they reference global symbols, the indices
9166 referenced must be updated. Update all the relocations found in
9170 elf_link_adjust_relocs (bfd
*abfd
,
9172 struct bfd_elf_section_reloc_data
*reldata
,
9174 struct bfd_link_info
*info
)
9177 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9179 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9180 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9181 bfd_vma r_type_mask
;
9183 unsigned int count
= reldata
->count
;
9184 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9186 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9188 swap_in
= bed
->s
->swap_reloc_in
;
9189 swap_out
= bed
->s
->swap_reloc_out
;
9191 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9193 swap_in
= bed
->s
->swap_reloca_in
;
9194 swap_out
= bed
->s
->swap_reloca_out
;
9199 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9202 if (bed
->s
->arch_size
== 32)
9209 r_type_mask
= 0xffffffff;
9213 erela
= reldata
->hdr
->contents
;
9214 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9216 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9219 if (*rel_hash
== NULL
)
9222 if ((*rel_hash
)->indx
== -2
9223 && info
->gc_sections
9224 && ! info
->gc_keep_exported
)
9226 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9227 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9229 (*rel_hash
)->root
.root
.string
);
9230 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9232 bfd_set_error (bfd_error_invalid_operation
);
9235 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9237 (*swap_in
) (abfd
, erela
, irela
);
9238 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9239 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9240 | (irela
[j
].r_info
& r_type_mask
));
9241 (*swap_out
) (abfd
, irela
, erela
);
9244 if (bed
->elf_backend_update_relocs
)
9245 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9247 if (sort
&& count
!= 0)
9249 bfd_vma (*ext_r_off
) (const void *);
9252 bfd_byte
*base
, *end
, *p
, *loc
;
9253 bfd_byte
*buf
= NULL
;
9255 if (bed
->s
->arch_size
== 32)
9257 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9258 ext_r_off
= ext32l_r_offset
;
9259 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9260 ext_r_off
= ext32b_r_offset
;
9266 #ifdef BFD_HOST_64_BIT
9267 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9268 ext_r_off
= ext64l_r_offset
;
9269 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9270 ext_r_off
= ext64b_r_offset
;
9276 /* Must use a stable sort here. A modified insertion sort,
9277 since the relocs are mostly sorted already. */
9278 elt_size
= reldata
->hdr
->sh_entsize
;
9279 base
= reldata
->hdr
->contents
;
9280 end
= base
+ count
* elt_size
;
9281 if (elt_size
> sizeof (Elf64_External_Rela
))
9284 /* Ensure the first element is lowest. This acts as a sentinel,
9285 speeding the main loop below. */
9286 r_off
= (*ext_r_off
) (base
);
9287 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9289 bfd_vma r_off2
= (*ext_r_off
) (p
);
9298 /* Don't just swap *base and *loc as that changes the order
9299 of the original base[0] and base[1] if they happen to
9300 have the same r_offset. */
9301 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9302 memcpy (onebuf
, loc
, elt_size
);
9303 memmove (base
+ elt_size
, base
, loc
- base
);
9304 memcpy (base
, onebuf
, elt_size
);
9307 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9309 /* base to p is sorted, *p is next to insert. */
9310 r_off
= (*ext_r_off
) (p
);
9311 /* Search the sorted region for location to insert. */
9313 while (r_off
< (*ext_r_off
) (loc
))
9318 /* Chances are there is a run of relocs to insert here,
9319 from one of more input files. Files are not always
9320 linked in order due to the way elf_link_input_bfd is
9321 called. See pr17666. */
9322 size_t sortlen
= p
- loc
;
9323 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9324 size_t runlen
= elt_size
;
9325 size_t buf_size
= 96 * 1024;
9326 while (p
+ runlen
< end
9327 && (sortlen
<= buf_size
9328 || runlen
+ elt_size
<= buf_size
)
9329 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9333 buf
= bfd_malloc (buf_size
);
9337 if (runlen
< sortlen
)
9339 memcpy (buf
, p
, runlen
);
9340 memmove (loc
+ runlen
, loc
, sortlen
);
9341 memcpy (loc
, buf
, runlen
);
9345 memcpy (buf
, loc
, sortlen
);
9346 memmove (loc
, p
, runlen
);
9347 memcpy (loc
+ runlen
, buf
, sortlen
);
9349 p
+= runlen
- elt_size
;
9352 /* Hashes are no longer valid. */
9353 free (reldata
->hashes
);
9354 reldata
->hashes
= NULL
;
9360 struct elf_link_sort_rela
9366 enum elf_reloc_type_class type
;
9367 /* We use this as an array of size int_rels_per_ext_rel. */
9368 Elf_Internal_Rela rela
[1];
9371 /* qsort stability here and for cmp2 is only an issue if multiple
9372 dynamic relocations are emitted at the same address. But targets
9373 that apply a series of dynamic relocations each operating on the
9374 result of the prior relocation can't use -z combreloc as
9375 implemented anyway. Such schemes tend to be broken by sorting on
9376 symbol index. That leaves dynamic NONE relocs as the only other
9377 case where ld might emit multiple relocs at the same address, and
9378 those are only emitted due to target bugs. */
9381 elf_link_sort_cmp1 (const void *A
, const void *B
)
9383 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9384 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9385 int relativea
, relativeb
;
9387 relativea
= a
->type
== reloc_class_relative
;
9388 relativeb
= b
->type
== reloc_class_relative
;
9390 if (relativea
< relativeb
)
9392 if (relativea
> relativeb
)
9394 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9396 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9398 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9400 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9406 elf_link_sort_cmp2 (const void *A
, const void *B
)
9408 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9409 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9411 if (a
->type
< b
->type
)
9413 if (a
->type
> b
->type
)
9415 if (a
->u
.offset
< b
->u
.offset
)
9417 if (a
->u
.offset
> b
->u
.offset
)
9419 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9421 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9427 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9429 asection
*dynamic_relocs
;
9432 bfd_size_type count
, size
;
9433 size_t i
, ret
, sort_elt
, ext_size
;
9434 bfd_byte
*sort
, *s_non_relative
, *p
;
9435 struct elf_link_sort_rela
*sq
;
9436 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9437 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9438 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9439 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9440 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9441 struct bfd_link_order
*lo
;
9443 bfd_boolean use_rela
;
9445 /* Find a dynamic reloc section. */
9446 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9447 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9448 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9449 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9451 bfd_boolean use_rela_initialised
= FALSE
;
9453 /* This is just here to stop gcc from complaining.
9454 Its initialization checking code is not perfect. */
9457 /* Both sections are present. Examine the sizes
9458 of the indirect sections to help us choose. */
9459 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9460 if (lo
->type
== bfd_indirect_link_order
)
9462 asection
*o
= lo
->u
.indirect
.section
;
9464 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9466 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9467 /* Section size is divisible by both rel and rela sizes.
9468 It is of no help to us. */
9472 /* Section size is only divisible by rela. */
9473 if (use_rela_initialised
&& !use_rela
)
9475 _bfd_error_handler (_("%pB: unable to sort relocs - "
9476 "they are in more than one size"),
9478 bfd_set_error (bfd_error_invalid_operation
);
9484 use_rela_initialised
= TRUE
;
9488 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9490 /* Section size is only divisible by rel. */
9491 if (use_rela_initialised
&& use_rela
)
9493 _bfd_error_handler (_("%pB: unable to sort relocs - "
9494 "they are in more than one size"),
9496 bfd_set_error (bfd_error_invalid_operation
);
9502 use_rela_initialised
= TRUE
;
9507 /* The section size is not divisible by either -
9508 something is wrong. */
9509 _bfd_error_handler (_("%pB: unable to sort relocs - "
9510 "they are of an unknown size"), abfd
);
9511 bfd_set_error (bfd_error_invalid_operation
);
9516 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9517 if (lo
->type
== bfd_indirect_link_order
)
9519 asection
*o
= lo
->u
.indirect
.section
;
9521 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9523 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9524 /* Section size is divisible by both rel and rela sizes.
9525 It is of no help to us. */
9529 /* Section size is only divisible by rela. */
9530 if (use_rela_initialised
&& !use_rela
)
9532 _bfd_error_handler (_("%pB: unable to sort relocs - "
9533 "they are in more than one size"),
9535 bfd_set_error (bfd_error_invalid_operation
);
9541 use_rela_initialised
= TRUE
;
9545 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9547 /* Section size is only divisible by rel. */
9548 if (use_rela_initialised
&& use_rela
)
9550 _bfd_error_handler (_("%pB: unable to sort relocs - "
9551 "they are in more than one size"),
9553 bfd_set_error (bfd_error_invalid_operation
);
9559 use_rela_initialised
= TRUE
;
9564 /* The section size is not divisible by either -
9565 something is wrong. */
9566 _bfd_error_handler (_("%pB: unable to sort relocs - "
9567 "they are of an unknown size"), abfd
);
9568 bfd_set_error (bfd_error_invalid_operation
);
9573 if (! use_rela_initialised
)
9577 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9579 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9586 dynamic_relocs
= rela_dyn
;
9587 ext_size
= bed
->s
->sizeof_rela
;
9588 swap_in
= bed
->s
->swap_reloca_in
;
9589 swap_out
= bed
->s
->swap_reloca_out
;
9593 dynamic_relocs
= rel_dyn
;
9594 ext_size
= bed
->s
->sizeof_rel
;
9595 swap_in
= bed
->s
->swap_reloc_in
;
9596 swap_out
= bed
->s
->swap_reloc_out
;
9600 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9601 if (lo
->type
== bfd_indirect_link_order
)
9602 size
+= lo
->u
.indirect
.section
->size
;
9604 if (size
!= dynamic_relocs
->size
)
9607 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9608 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9610 count
= dynamic_relocs
->size
/ ext_size
;
9613 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9617 (*info
->callbacks
->warning
)
9618 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9622 if (bed
->s
->arch_size
== 32)
9623 r_sym_mask
= ~(bfd_vma
) 0xff;
9625 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9627 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9628 if (lo
->type
== bfd_indirect_link_order
)
9630 bfd_byte
*erel
, *erelend
;
9631 asection
*o
= lo
->u
.indirect
.section
;
9633 if (o
->contents
== NULL
&& o
->size
!= 0)
9635 /* This is a reloc section that is being handled as a normal
9636 section. See bfd_section_from_shdr. We can't combine
9637 relocs in this case. */
9642 erelend
= o
->contents
+ o
->size
;
9643 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9645 while (erel
< erelend
)
9647 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9649 (*swap_in
) (abfd
, erel
, s
->rela
);
9650 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9651 s
->u
.sym_mask
= r_sym_mask
;
9657 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9659 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9661 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9662 if (s
->type
!= reloc_class_relative
)
9668 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9669 for (; i
< count
; i
++, p
+= sort_elt
)
9671 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9672 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9674 sp
->u
.offset
= sq
->rela
->r_offset
;
9677 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9679 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9680 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9682 /* We have plt relocs in .rela.dyn. */
9683 sq
= (struct elf_link_sort_rela
*) sort
;
9684 for (i
= 0; i
< count
; i
++)
9685 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9687 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9689 struct bfd_link_order
**plo
;
9690 /* Put srelplt link_order last. This is so the output_offset
9691 set in the next loop is correct for DT_JMPREL. */
9692 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9693 if ((*plo
)->type
== bfd_indirect_link_order
9694 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9700 plo
= &(*plo
)->next
;
9703 dynamic_relocs
->map_tail
.link_order
= lo
;
9708 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9709 if (lo
->type
== bfd_indirect_link_order
)
9711 bfd_byte
*erel
, *erelend
;
9712 asection
*o
= lo
->u
.indirect
.section
;
9715 erelend
= o
->contents
+ o
->size
;
9716 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9717 while (erel
< erelend
)
9719 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9720 (*swap_out
) (abfd
, s
->rela
, erel
);
9727 *psec
= dynamic_relocs
;
9731 /* Add a symbol to the output symbol string table. */
9734 elf_link_output_symstrtab (struct elf_final_link_info
*flinfo
,
9736 Elf_Internal_Sym
*elfsym
,
9737 asection
*input_sec
,
9738 struct elf_link_hash_entry
*h
)
9740 int (*output_symbol_hook
)
9741 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9742 struct elf_link_hash_entry
*);
9743 struct elf_link_hash_table
*hash_table
;
9744 const struct elf_backend_data
*bed
;
9745 bfd_size_type strtabsize
;
9747 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9749 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9750 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9751 if (output_symbol_hook
!= NULL
)
9753 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9758 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9759 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9760 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9761 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9765 || (input_sec
->flags
& SEC_EXCLUDE
))
9766 elfsym
->st_name
= (unsigned long) -1;
9769 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9770 to get the final offset for st_name. */
9771 char *versioned_name
= (char *) name
;
9774 if (h
->versioned
== versioned
&& h
->def_dynamic
)
9776 /* Keep only one '@' for versioned symbols defined in
9778 char *version
= strrchr (name
, ELF_VER_CHR
);
9779 char *base_end
= strchr (name
, ELF_VER_CHR
);
9780 if (version
!= base_end
)
9783 size_t len
= strlen (name
);
9784 versioned_name
= bfd_alloc (flinfo
->output_bfd
, len
);
9785 if (versioned_name
== NULL
)
9787 base_len
= base_end
- name
;
9788 memcpy (versioned_name
, name
, base_len
);
9789 memcpy (versioned_name
+ base_len
, version
,
9794 else if (flinfo
->info
->unique_symbol
9795 && ELF_ST_BIND (elfsym
->st_info
) == STB_LOCAL
)
9797 struct local_hash_entry
*lh
;
9798 switch (ELF_ST_TYPE (elfsym
->st_info
))
9804 lh
= (struct local_hash_entry
*) bfd_hash_lookup
9805 (&flinfo
->local_hash_table
, name
, TRUE
, FALSE
);
9810 /* Append ".COUNT" to duplicated local symbols. */
9812 size_t base_len
= lh
->size
;
9814 sprintf (buf
, "%lx", lh
->count
);
9817 base_len
= strlen (name
);
9818 lh
->size
= base_len
;
9820 count_len
= strlen (buf
);
9821 versioned_name
= bfd_alloc (flinfo
->output_bfd
,
9822 base_len
+ count_len
+ 2);
9823 if (versioned_name
== NULL
)
9825 memcpy (versioned_name
, name
, base_len
);
9826 versioned_name
[base_len
] = '.';
9827 memcpy (versioned_name
+ base_len
+ 1, buf
,
9835 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9836 versioned_name
, FALSE
);
9837 if (elfsym
->st_name
== (unsigned long) -1)
9841 hash_table
= elf_hash_table (flinfo
->info
);
9842 strtabsize
= hash_table
->strtabsize
;
9843 if (strtabsize
<= hash_table
->strtabcount
)
9845 strtabsize
+= strtabsize
;
9846 hash_table
->strtabsize
= strtabsize
;
9847 strtabsize
*= sizeof (*hash_table
->strtab
);
9849 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9851 if (hash_table
->strtab
== NULL
)
9854 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9855 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9856 = hash_table
->strtabcount
;
9857 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9858 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9860 flinfo
->output_bfd
->symcount
+= 1;
9861 hash_table
->strtabcount
+= 1;
9866 /* Swap symbols out to the symbol table and flush the output symbols to
9870 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9872 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9875 const struct elf_backend_data
*bed
;
9877 Elf_Internal_Shdr
*hdr
;
9881 if (!hash_table
->strtabcount
)
9884 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9886 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9888 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9889 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9893 if (flinfo
->symshndxbuf
)
9895 amt
= sizeof (Elf_External_Sym_Shndx
);
9896 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9897 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9898 if (flinfo
->symshndxbuf
== NULL
)
9905 /* Now swap out the symbols. */
9906 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9908 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9909 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9910 elfsym
->sym
.st_name
= 0;
9913 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9914 elfsym
->sym
.st_name
);
9916 /* Inform the linker of the addition of this symbol. */
9918 if (flinfo
->info
->callbacks
->ctf_new_symbol
)
9919 flinfo
->info
->callbacks
->ctf_new_symbol (elfsym
->dest_index
,
9922 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9923 ((bfd_byte
*) symbuf
9924 + (elfsym
->dest_index
9925 * bed
->s
->sizeof_sym
)),
9926 (flinfo
->symshndxbuf
9927 + elfsym
->destshndx_index
));
9930 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9931 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9932 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9933 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9934 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9936 hdr
->sh_size
+= amt
;
9944 free (hash_table
->strtab
);
9945 hash_table
->strtab
= NULL
;
9950 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9953 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9955 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9956 && sym
->st_shndx
< SHN_LORESERVE
)
9958 /* The gABI doesn't support dynamic symbols in output sections
9961 /* xgettext:c-format */
9962 (_("%pB: too many sections: %d (>= %d)"),
9963 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9964 bfd_set_error (bfd_error_nonrepresentable_section
);
9970 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9971 allowing an unsatisfied unversioned symbol in the DSO to match a
9972 versioned symbol that would normally require an explicit version.
9973 We also handle the case that a DSO references a hidden symbol
9974 which may be satisfied by a versioned symbol in another DSO. */
9977 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
9978 const struct elf_backend_data
*bed
,
9979 struct elf_link_hash_entry
*h
)
9982 struct elf_link_loaded_list
*loaded
;
9984 if (!is_elf_hash_table (info
->hash
))
9987 /* Check indirect symbol. */
9988 while (h
->root
.type
== bfd_link_hash_indirect
)
9989 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9991 switch (h
->root
.type
)
9997 case bfd_link_hash_undefined
:
9998 case bfd_link_hash_undefweak
:
9999 abfd
= h
->root
.u
.undef
.abfd
;
10001 || (abfd
->flags
& DYNAMIC
) == 0
10002 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
10006 case bfd_link_hash_defined
:
10007 case bfd_link_hash_defweak
:
10008 abfd
= h
->root
.u
.def
.section
->owner
;
10011 case bfd_link_hash_common
:
10012 abfd
= h
->root
.u
.c
.p
->section
->owner
;
10015 BFD_ASSERT (abfd
!= NULL
);
10017 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
10019 loaded
= loaded
->next
)
10022 Elf_Internal_Shdr
*hdr
;
10024 size_t extsymcount
;
10026 Elf_Internal_Shdr
*versymhdr
;
10027 Elf_Internal_Sym
*isym
;
10028 Elf_Internal_Sym
*isymend
;
10029 Elf_Internal_Sym
*isymbuf
;
10030 Elf_External_Versym
*ever
;
10031 Elf_External_Versym
*extversym
;
10033 input
= loaded
->abfd
;
10035 /* We check each DSO for a possible hidden versioned definition. */
10037 || elf_dynversym (input
) == 0)
10040 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
10042 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10043 if (elf_bad_symtab (input
))
10045 extsymcount
= symcount
;
10050 extsymcount
= symcount
- hdr
->sh_info
;
10051 extsymoff
= hdr
->sh_info
;
10054 if (extsymcount
== 0)
10057 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
10059 if (isymbuf
== NULL
)
10062 /* Read in any version definitions. */
10063 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
10064 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
10065 || (extversym
= (Elf_External_Versym
*)
10066 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
10067 versymhdr
->sh_size
)) == NULL
)
10073 ever
= extversym
+ extsymoff
;
10074 isymend
= isymbuf
+ extsymcount
;
10075 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
10078 Elf_Internal_Versym iver
;
10079 unsigned short version_index
;
10081 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
10082 || isym
->st_shndx
== SHN_UNDEF
)
10085 name
= bfd_elf_string_from_elf_section (input
,
10088 if (strcmp (name
, h
->root
.root
.string
) != 0)
10091 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
10093 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
10094 && !(h
->def_regular
10095 && h
->forced_local
))
10097 /* If we have a non-hidden versioned sym, then it should
10098 have provided a definition for the undefined sym unless
10099 it is defined in a non-shared object and forced local.
10104 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
10105 if (version_index
== 1 || version_index
== 2)
10107 /* This is the base or first version. We can use it. */
10121 /* Convert ELF common symbol TYPE. */
10124 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
10126 /* Commom symbol can only appear in relocatable link. */
10127 if (!bfd_link_relocatable (info
))
10129 switch (info
->elf_stt_common
)
10133 case elf_stt_common
:
10136 case no_elf_stt_common
:
10143 /* Add an external symbol to the symbol table. This is called from
10144 the hash table traversal routine. When generating a shared object,
10145 we go through the symbol table twice. The first time we output
10146 anything that might have been forced to local scope in a version
10147 script. The second time we output the symbols that are still
10151 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
10153 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
10154 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
10155 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
10157 Elf_Internal_Sym sym
;
10158 asection
*input_sec
;
10159 const struct elf_backend_data
*bed
;
10164 if (h
->root
.type
== bfd_link_hash_warning
)
10166 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10167 if (h
->root
.type
== bfd_link_hash_new
)
10171 /* Decide whether to output this symbol in this pass. */
10172 if (eoinfo
->localsyms
)
10174 if (!h
->forced_local
)
10179 if (h
->forced_local
)
10183 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10185 if (h
->root
.type
== bfd_link_hash_undefined
)
10187 /* If we have an undefined symbol reference here then it must have
10188 come from a shared library that is being linked in. (Undefined
10189 references in regular files have already been handled unless
10190 they are in unreferenced sections which are removed by garbage
10192 bfd_boolean ignore_undef
= FALSE
;
10194 /* Some symbols may be special in that the fact that they're
10195 undefined can be safely ignored - let backend determine that. */
10196 if (bed
->elf_backend_ignore_undef_symbol
)
10197 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
10199 /* If we are reporting errors for this situation then do so now. */
10201 && h
->ref_dynamic_nonweak
10202 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
10203 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10204 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10206 flinfo
->info
->callbacks
->undefined_symbol
10207 (flinfo
->info
, h
->root
.root
.string
,
10208 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10209 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10210 && !flinfo
->info
->warn_unresolved_syms
);
10213 /* Strip a global symbol defined in a discarded section. */
10218 /* We should also warn if a forced local symbol is referenced from
10219 shared libraries. */
10220 if (bfd_link_executable (flinfo
->info
)
10225 && h
->ref_dynamic_nonweak
10226 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10230 struct elf_link_hash_entry
*hi
= h
;
10232 /* Check indirect symbol. */
10233 while (hi
->root
.type
== bfd_link_hash_indirect
)
10234 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10236 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10237 /* xgettext:c-format */
10238 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10239 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10240 /* xgettext:c-format */
10241 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10243 /* xgettext:c-format */
10244 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10245 def_bfd
= flinfo
->output_bfd
;
10246 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10247 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10248 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10249 h
->root
.root
.string
, def_bfd
);
10250 bfd_set_error (bfd_error_bad_value
);
10251 eoinfo
->failed
= TRUE
;
10255 /* We don't want to output symbols that have never been mentioned by
10256 a regular file, or that we have been told to strip. However, if
10257 h->indx is set to -2, the symbol is used by a reloc and we must
10262 else if ((h
->def_dynamic
10264 || h
->root
.type
== bfd_link_hash_new
)
10266 && !h
->ref_regular
)
10268 else if (flinfo
->info
->strip
== strip_all
)
10270 else if (flinfo
->info
->strip
== strip_some
10271 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10272 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
10274 else if ((h
->root
.type
== bfd_link_hash_defined
10275 || h
->root
.type
== bfd_link_hash_defweak
)
10276 && ((flinfo
->info
->strip_discarded
10277 && discarded_section (h
->root
.u
.def
.section
))
10278 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10279 && h
->root
.u
.def
.section
->owner
!= NULL
10280 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10282 else if ((h
->root
.type
== bfd_link_hash_undefined
10283 || h
->root
.type
== bfd_link_hash_undefweak
)
10284 && h
->root
.u
.undef
.abfd
!= NULL
10285 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10290 /* If we're stripping it, and it's not a dynamic symbol, there's
10291 nothing else to do. However, if it is a forced local symbol or
10292 an ifunc symbol we need to give the backend finish_dynamic_symbol
10293 function a chance to make it dynamic. */
10295 && h
->dynindx
== -1
10296 && type
!= STT_GNU_IFUNC
10297 && !h
->forced_local
)
10301 sym
.st_size
= h
->size
;
10302 sym
.st_other
= h
->other
;
10303 switch (h
->root
.type
)
10306 case bfd_link_hash_new
:
10307 case bfd_link_hash_warning
:
10311 case bfd_link_hash_undefined
:
10312 case bfd_link_hash_undefweak
:
10313 input_sec
= bfd_und_section_ptr
;
10314 sym
.st_shndx
= SHN_UNDEF
;
10317 case bfd_link_hash_defined
:
10318 case bfd_link_hash_defweak
:
10320 input_sec
= h
->root
.u
.def
.section
;
10321 if (input_sec
->output_section
!= NULL
)
10324 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10325 input_sec
->output_section
);
10326 if (sym
.st_shndx
== SHN_BAD
)
10329 /* xgettext:c-format */
10330 (_("%pB: could not find output section %pA for input section %pA"),
10331 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10332 bfd_set_error (bfd_error_nonrepresentable_section
);
10333 eoinfo
->failed
= TRUE
;
10337 /* ELF symbols in relocatable files are section relative,
10338 but in nonrelocatable files they are virtual
10340 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10341 if (!bfd_link_relocatable (flinfo
->info
))
10343 sym
.st_value
+= input_sec
->output_section
->vma
;
10344 if (h
->type
== STT_TLS
)
10346 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10347 if (tls_sec
!= NULL
)
10348 sym
.st_value
-= tls_sec
->vma
;
10354 BFD_ASSERT (input_sec
->owner
== NULL
10355 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10356 sym
.st_shndx
= SHN_UNDEF
;
10357 input_sec
= bfd_und_section_ptr
;
10362 case bfd_link_hash_common
:
10363 input_sec
= h
->root
.u
.c
.p
->section
;
10364 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10365 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10368 case bfd_link_hash_indirect
:
10369 /* These symbols are created by symbol versioning. They point
10370 to the decorated version of the name. For example, if the
10371 symbol foo@@GNU_1.2 is the default, which should be used when
10372 foo is used with no version, then we add an indirect symbol
10373 foo which points to foo@@GNU_1.2. We ignore these symbols,
10374 since the indirected symbol is already in the hash table. */
10378 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10379 switch (h
->root
.type
)
10381 case bfd_link_hash_common
:
10382 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10384 case bfd_link_hash_defined
:
10385 case bfd_link_hash_defweak
:
10386 if (bed
->common_definition (&sym
))
10387 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10391 case bfd_link_hash_undefined
:
10392 case bfd_link_hash_undefweak
:
10398 if (h
->forced_local
)
10400 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10401 /* Turn off visibility on local symbol. */
10402 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10404 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10405 else if (h
->unique_global
&& h
->def_regular
)
10406 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10407 else if (h
->root
.type
== bfd_link_hash_undefweak
10408 || h
->root
.type
== bfd_link_hash_defweak
)
10409 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10411 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10412 sym
.st_target_internal
= h
->target_internal
;
10414 /* Give the processor backend a chance to tweak the symbol value,
10415 and also to finish up anything that needs to be done for this
10416 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10417 forced local syms when non-shared is due to a historical quirk.
10418 STT_GNU_IFUNC symbol must go through PLT. */
10419 if ((h
->type
== STT_GNU_IFUNC
10421 && !bfd_link_relocatable (flinfo
->info
))
10422 || ((h
->dynindx
!= -1
10423 || h
->forced_local
)
10424 && ((bfd_link_pic (flinfo
->info
)
10425 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10426 || h
->root
.type
!= bfd_link_hash_undefweak
))
10427 || !h
->forced_local
)
10428 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10430 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10431 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10433 eoinfo
->failed
= TRUE
;
10438 /* If we are marking the symbol as undefined, and there are no
10439 non-weak references to this symbol from a regular object, then
10440 mark the symbol as weak undefined; if there are non-weak
10441 references, mark the symbol as strong. We can't do this earlier,
10442 because it might not be marked as undefined until the
10443 finish_dynamic_symbol routine gets through with it. */
10444 if (sym
.st_shndx
== SHN_UNDEF
10446 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10447 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10450 type
= ELF_ST_TYPE (sym
.st_info
);
10452 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10453 if (type
== STT_GNU_IFUNC
)
10456 if (h
->ref_regular_nonweak
)
10457 bindtype
= STB_GLOBAL
;
10459 bindtype
= STB_WEAK
;
10460 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10463 /* If this is a symbol defined in a dynamic library, don't use the
10464 symbol size from the dynamic library. Relinking an executable
10465 against a new library may introduce gratuitous changes in the
10466 executable's symbols if we keep the size. */
10467 if (sym
.st_shndx
== SHN_UNDEF
10472 /* If a non-weak symbol with non-default visibility is not defined
10473 locally, it is a fatal error. */
10474 if (!bfd_link_relocatable (flinfo
->info
)
10475 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10476 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10477 && h
->root
.type
== bfd_link_hash_undefined
10478 && !h
->def_regular
)
10482 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10483 /* xgettext:c-format */
10484 msg
= _("%pB: protected symbol `%s' isn't defined");
10485 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10486 /* xgettext:c-format */
10487 msg
= _("%pB: internal symbol `%s' isn't defined");
10489 /* xgettext:c-format */
10490 msg
= _("%pB: hidden symbol `%s' isn't defined");
10491 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10492 bfd_set_error (bfd_error_bad_value
);
10493 eoinfo
->failed
= TRUE
;
10497 /* If this symbol should be put in the .dynsym section, then put it
10498 there now. We already know the symbol index. We also fill in
10499 the entry in the .hash section. */
10500 if (h
->dynindx
!= -1
10501 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10502 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10503 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10507 /* Since there is no version information in the dynamic string,
10508 if there is no version info in symbol version section, we will
10509 have a run-time problem if not linking executable, referenced
10510 by shared library, or not bound locally. */
10511 if (h
->verinfo
.verdef
== NULL
10512 && (!bfd_link_executable (flinfo
->info
)
10514 || !h
->def_regular
))
10516 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10518 if (p
&& p
[1] != '\0')
10521 /* xgettext:c-format */
10522 (_("%pB: no symbol version section for versioned symbol `%s'"),
10523 flinfo
->output_bfd
, h
->root
.root
.string
);
10524 eoinfo
->failed
= TRUE
;
10529 sym
.st_name
= h
->dynstr_index
;
10530 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10531 + h
->dynindx
* bed
->s
->sizeof_sym
);
10532 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10534 eoinfo
->failed
= TRUE
;
10538 /* Inform the linker of the addition of this symbol. */
10540 if (flinfo
->info
->callbacks
->ctf_new_dynsym
)
10541 flinfo
->info
->callbacks
->ctf_new_dynsym (h
->dynindx
, &sym
);
10543 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10545 if (flinfo
->hash_sec
!= NULL
)
10547 size_t hash_entry_size
;
10548 bfd_byte
*bucketpos
;
10550 size_t bucketcount
;
10553 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10554 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10557 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10558 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10559 + (bucket
+ 2) * hash_entry_size
);
10560 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10561 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10563 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10564 ((bfd_byte
*) flinfo
->hash_sec
->contents
10565 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10568 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10570 Elf_Internal_Versym iversym
;
10571 Elf_External_Versym
*eversym
;
10573 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10575 if (h
->verinfo
.verdef
== NULL
10576 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10577 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10578 iversym
.vs_vers
= 1;
10580 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10584 if (h
->verinfo
.vertree
== NULL
)
10585 iversym
.vs_vers
= 1;
10587 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10588 if (flinfo
->info
->create_default_symver
)
10592 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10593 defined locally. */
10594 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10595 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10597 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10598 eversym
+= h
->dynindx
;
10599 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10603 /* If the symbol is undefined, and we didn't output it to .dynsym,
10604 strip it from .symtab too. Obviously we can't do this for
10605 relocatable output or when needed for --emit-relocs. */
10606 else if (input_sec
== bfd_und_section_ptr
10608 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10609 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10610 && !bfd_link_relocatable (flinfo
->info
))
10613 /* Also strip others that we couldn't earlier due to dynamic symbol
10617 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10620 /* Output a FILE symbol so that following locals are not associated
10621 with the wrong input file. We need one for forced local symbols
10622 if we've seen more than one FILE symbol or when we have exactly
10623 one FILE symbol but global symbols are present in a file other
10624 than the one with the FILE symbol. We also need one if linker
10625 defined symbols are present. In practice these conditions are
10626 always met, so just emit the FILE symbol unconditionally. */
10627 if (eoinfo
->localsyms
10628 && !eoinfo
->file_sym_done
10629 && eoinfo
->flinfo
->filesym_count
!= 0)
10631 Elf_Internal_Sym fsym
;
10633 memset (&fsym
, 0, sizeof (fsym
));
10634 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10635 fsym
.st_shndx
= SHN_ABS
;
10636 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10637 bfd_und_section_ptr
, NULL
))
10640 eoinfo
->file_sym_done
= TRUE
;
10643 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10644 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10648 eoinfo
->failed
= TRUE
;
10653 else if (h
->indx
== -2)
10659 /* Return TRUE if special handling is done for relocs in SEC against
10660 symbols defined in discarded sections. */
10663 elf_section_ignore_discarded_relocs (asection
*sec
)
10665 const struct elf_backend_data
*bed
;
10667 switch (sec
->sec_info_type
)
10669 case SEC_INFO_TYPE_STABS
:
10670 case SEC_INFO_TYPE_EH_FRAME
:
10671 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10677 bed
= get_elf_backend_data (sec
->owner
);
10678 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10679 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10685 /* Return a mask saying how ld should treat relocations in SEC against
10686 symbols defined in discarded sections. If this function returns
10687 COMPLAIN set, ld will issue a warning message. If this function
10688 returns PRETEND set, and the discarded section was link-once and the
10689 same size as the kept link-once section, ld will pretend that the
10690 symbol was actually defined in the kept section. Otherwise ld will
10691 zero the reloc (at least that is the intent, but some cooperation by
10692 the target dependent code is needed, particularly for REL targets). */
10695 _bfd_elf_default_action_discarded (asection
*sec
)
10697 if (sec
->flags
& SEC_DEBUGGING
)
10700 if (strcmp (".eh_frame", sec
->name
) == 0)
10703 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10706 return COMPLAIN
| PRETEND
;
10709 /* Find a match between a section and a member of a section group. */
10712 match_group_member (asection
*sec
, asection
*group
,
10713 struct bfd_link_info
*info
)
10715 asection
*first
= elf_next_in_group (group
);
10716 asection
*s
= first
;
10720 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10723 s
= elf_next_in_group (s
);
10731 /* Check if the kept section of a discarded section SEC can be used
10732 to replace it. Return the replacement if it is OK. Otherwise return
10736 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10740 kept
= sec
->kept_section
;
10743 if ((kept
->flags
& SEC_GROUP
) != 0)
10744 kept
= match_group_member (sec
, kept
, info
);
10747 if ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10748 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
))
10752 /* Get the real kept section. */
10754 for (next
= kept
->kept_section
;
10756 next
= next
->kept_section
)
10760 sec
->kept_section
= kept
;
10765 /* Link an input file into the linker output file. This function
10766 handles all the sections and relocations of the input file at once.
10767 This is so that we only have to read the local symbols once, and
10768 don't have to keep them in memory. */
10771 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10773 int (*relocate_section
)
10774 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10775 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10777 Elf_Internal_Shdr
*symtab_hdr
;
10778 size_t locsymcount
;
10780 Elf_Internal_Sym
*isymbuf
;
10781 Elf_Internal_Sym
*isym
;
10782 Elf_Internal_Sym
*isymend
;
10784 asection
**ppsection
;
10786 const struct elf_backend_data
*bed
;
10787 struct elf_link_hash_entry
**sym_hashes
;
10788 bfd_size_type address_size
;
10789 bfd_vma r_type_mask
;
10791 bfd_boolean have_file_sym
= FALSE
;
10793 output_bfd
= flinfo
->output_bfd
;
10794 bed
= get_elf_backend_data (output_bfd
);
10795 relocate_section
= bed
->elf_backend_relocate_section
;
10797 /* If this is a dynamic object, we don't want to do anything here:
10798 we don't want the local symbols, and we don't want the section
10800 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10803 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10804 if (elf_bad_symtab (input_bfd
))
10806 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10811 locsymcount
= symtab_hdr
->sh_info
;
10812 extsymoff
= symtab_hdr
->sh_info
;
10815 /* Enable GNU OSABI features in the output BFD that are used in the input
10817 if (bed
->elf_osabi
== ELFOSABI_NONE
10818 || bed
->elf_osabi
== ELFOSABI_GNU
10819 || bed
->elf_osabi
== ELFOSABI_FREEBSD
)
10820 elf_tdata (output_bfd
)->has_gnu_osabi
10821 |= (elf_tdata (input_bfd
)->has_gnu_osabi
10822 & (bfd_link_relocatable (flinfo
->info
)
10823 ? -1 : ~elf_gnu_osabi_retain
));
10825 /* Read the local symbols. */
10826 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10827 if (isymbuf
== NULL
&& locsymcount
!= 0)
10829 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10830 flinfo
->internal_syms
,
10831 flinfo
->external_syms
,
10832 flinfo
->locsym_shndx
);
10833 if (isymbuf
== NULL
)
10837 /* Find local symbol sections and adjust values of symbols in
10838 SEC_MERGE sections. Write out those local symbols we know are
10839 going into the output file. */
10840 isymend
= isymbuf
+ locsymcount
;
10841 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10843 isym
++, pindex
++, ppsection
++)
10847 Elf_Internal_Sym osym
;
10853 if (elf_bad_symtab (input_bfd
))
10855 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10862 if (isym
->st_shndx
== SHN_UNDEF
)
10863 isec
= bfd_und_section_ptr
;
10864 else if (isym
->st_shndx
== SHN_ABS
)
10865 isec
= bfd_abs_section_ptr
;
10866 else if (isym
->st_shndx
== SHN_COMMON
)
10867 isec
= bfd_com_section_ptr
;
10870 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10873 /* Don't attempt to output symbols with st_shnx in the
10874 reserved range other than SHN_ABS and SHN_COMMON. */
10875 isec
= bfd_und_section_ptr
;
10877 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10878 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10880 _bfd_merged_section_offset (output_bfd
, &isec
,
10881 elf_section_data (isec
)->sec_info
,
10887 /* Don't output the first, undefined, symbol. In fact, don't
10888 output any undefined local symbol. */
10889 if (isec
== bfd_und_section_ptr
)
10892 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10894 /* We never output section symbols. Instead, we use the
10895 section symbol of the corresponding section in the output
10900 /* If we are stripping all symbols, we don't want to output this
10902 if (flinfo
->info
->strip
== strip_all
)
10905 /* If we are discarding all local symbols, we don't want to
10906 output this one. If we are generating a relocatable output
10907 file, then some of the local symbols may be required by
10908 relocs; we output them below as we discover that they are
10910 if (flinfo
->info
->discard
== discard_all
)
10913 /* If this symbol is defined in a section which we are
10914 discarding, we don't need to keep it. */
10915 if (isym
->st_shndx
!= SHN_UNDEF
10916 && isym
->st_shndx
< SHN_LORESERVE
10917 && isec
->output_section
== NULL
10918 && flinfo
->info
->non_contiguous_regions
10919 && flinfo
->info
->non_contiguous_regions_warnings
)
10921 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10922 "discards section `%s' from '%s'\n"),
10923 isec
->name
, bfd_get_filename (isec
->owner
));
10927 if (isym
->st_shndx
!= SHN_UNDEF
10928 && isym
->st_shndx
< SHN_LORESERVE
10929 && bfd_section_removed_from_list (output_bfd
,
10930 isec
->output_section
))
10933 /* Get the name of the symbol. */
10934 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10939 /* See if we are discarding symbols with this name. */
10940 if ((flinfo
->info
->strip
== strip_some
10941 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
10943 || (((flinfo
->info
->discard
== discard_sec_merge
10944 && (isec
->flags
& SEC_MERGE
)
10945 && !bfd_link_relocatable (flinfo
->info
))
10946 || flinfo
->info
->discard
== discard_l
)
10947 && bfd_is_local_label_name (input_bfd
, name
)))
10950 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10952 if (input_bfd
->lto_output
)
10953 /* -flto puts a temp file name here. This means builds
10954 are not reproducible. Discard the symbol. */
10956 have_file_sym
= TRUE
;
10957 flinfo
->filesym_count
+= 1;
10959 if (!have_file_sym
)
10961 /* In the absence of debug info, bfd_find_nearest_line uses
10962 FILE symbols to determine the source file for local
10963 function symbols. Provide a FILE symbol here if input
10964 files lack such, so that their symbols won't be
10965 associated with a previous input file. It's not the
10966 source file, but the best we can do. */
10967 const char *filename
;
10968 have_file_sym
= TRUE
;
10969 flinfo
->filesym_count
+= 1;
10970 memset (&osym
, 0, sizeof (osym
));
10971 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10972 osym
.st_shndx
= SHN_ABS
;
10973 if (input_bfd
->lto_output
)
10976 filename
= lbasename (bfd_get_filename (input_bfd
));
10977 if (!elf_link_output_symstrtab (flinfo
, filename
, &osym
,
10978 bfd_abs_section_ptr
, NULL
))
10984 /* Adjust the section index for the output file. */
10985 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10986 isec
->output_section
);
10987 if (osym
.st_shndx
== SHN_BAD
)
10990 /* ELF symbols in relocatable files are section relative, but
10991 in executable files they are virtual addresses. Note that
10992 this code assumes that all ELF sections have an associated
10993 BFD section with a reasonable value for output_offset; below
10994 we assume that they also have a reasonable value for
10995 output_section. Any special sections must be set up to meet
10996 these requirements. */
10997 osym
.st_value
+= isec
->output_offset
;
10998 if (!bfd_link_relocatable (flinfo
->info
))
11000 osym
.st_value
+= isec
->output_section
->vma
;
11001 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
11003 /* STT_TLS symbols are relative to PT_TLS segment base. */
11004 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
11005 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
11007 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
11012 indx
= bfd_get_symcount (output_bfd
);
11013 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
11020 if (bed
->s
->arch_size
== 32)
11022 r_type_mask
= 0xff;
11028 r_type_mask
= 0xffffffff;
11033 /* Relocate the contents of each section. */
11034 sym_hashes
= elf_sym_hashes (input_bfd
);
11035 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
11037 bfd_byte
*contents
;
11039 if (! o
->linker_mark
)
11041 /* This section was omitted from the link. */
11045 if (!flinfo
->info
->resolve_section_groups
11046 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
11048 /* Deal with the group signature symbol. */
11049 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
11050 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
11051 asection
*osec
= o
->output_section
;
11053 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
11054 if (symndx
>= locsymcount
11055 || (elf_bad_symtab (input_bfd
)
11056 && flinfo
->sections
[symndx
] == NULL
))
11058 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
11059 while (h
->root
.type
== bfd_link_hash_indirect
11060 || h
->root
.type
== bfd_link_hash_warning
)
11061 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11062 /* Arrange for symbol to be output. */
11064 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
11066 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
11068 /* We'll use the output section target_index. */
11069 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11070 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
11074 if (flinfo
->indices
[symndx
] == -1)
11076 /* Otherwise output the local symbol now. */
11077 Elf_Internal_Sym sym
= isymbuf
[symndx
];
11078 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11083 name
= bfd_elf_string_from_elf_section (input_bfd
,
11084 symtab_hdr
->sh_link
,
11089 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11091 if (sym
.st_shndx
== SHN_BAD
)
11094 sym
.st_value
+= o
->output_offset
;
11096 indx
= bfd_get_symcount (output_bfd
);
11097 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
11102 flinfo
->indices
[symndx
] = indx
;
11106 elf_section_data (osec
)->this_hdr
.sh_info
11107 = flinfo
->indices
[symndx
];
11111 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11112 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
11115 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
11117 /* Section was created by _bfd_elf_link_create_dynamic_sections
11122 /* Get the contents of the section. They have been cached by a
11123 relaxation routine. Note that o is a section in an input
11124 file, so the contents field will not have been set by any of
11125 the routines which work on output files. */
11126 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
11128 contents
= elf_section_data (o
)->this_hdr
.contents
;
11129 if (bed
->caches_rawsize
11131 && o
->rawsize
< o
->size
)
11133 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
11134 contents
= flinfo
->contents
;
11139 contents
= flinfo
->contents
;
11140 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
11144 if ((o
->flags
& SEC_RELOC
) != 0)
11146 Elf_Internal_Rela
*internal_relocs
;
11147 Elf_Internal_Rela
*rel
, *relend
;
11148 int action_discarded
;
11151 /* Get the swapped relocs. */
11153 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
11154 flinfo
->internal_relocs
, FALSE
);
11155 if (internal_relocs
== NULL
11156 && o
->reloc_count
> 0)
11159 /* We need to reverse-copy input .ctors/.dtors sections if
11160 they are placed in .init_array/.finit_array for output. */
11161 if (o
->size
> address_size
11162 && ((strncmp (o
->name
, ".ctors", 6) == 0
11163 && strcmp (o
->output_section
->name
,
11164 ".init_array") == 0)
11165 || (strncmp (o
->name
, ".dtors", 6) == 0
11166 && strcmp (o
->output_section
->name
,
11167 ".fini_array") == 0))
11168 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
11170 if (o
->size
* bed
->s
->int_rels_per_ext_rel
11171 != o
->reloc_count
* address_size
)
11174 /* xgettext:c-format */
11175 (_("error: %pB: size of section %pA is not "
11176 "multiple of address size"),
11178 bfd_set_error (bfd_error_bad_value
);
11181 o
->flags
|= SEC_ELF_REVERSE_COPY
;
11184 action_discarded
= -1;
11185 if (!elf_section_ignore_discarded_relocs (o
))
11186 action_discarded
= (*bed
->action_discarded
) (o
);
11188 /* Run through the relocs evaluating complex reloc symbols and
11189 looking for relocs against symbols from discarded sections
11190 or section symbols from removed link-once sections.
11191 Complain about relocs against discarded sections. Zero
11192 relocs against removed link-once sections. */
11194 rel
= internal_relocs
;
11195 relend
= rel
+ o
->reloc_count
;
11196 for ( ; rel
< relend
; rel
++)
11198 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
11199 unsigned int s_type
;
11200 asection
**ps
, *sec
;
11201 struct elf_link_hash_entry
*h
= NULL
;
11202 const char *sym_name
;
11204 if (r_symndx
== STN_UNDEF
)
11207 if (r_symndx
>= locsymcount
11208 || (elf_bad_symtab (input_bfd
)
11209 && flinfo
->sections
[r_symndx
] == NULL
))
11211 h
= sym_hashes
[r_symndx
- extsymoff
];
11213 /* Badly formatted input files can contain relocs that
11214 reference non-existant symbols. Check here so that
11215 we do not seg fault. */
11219 /* xgettext:c-format */
11220 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
11221 "that references a non-existent global symbol"),
11222 input_bfd
, (uint64_t) rel
->r_info
, o
);
11223 bfd_set_error (bfd_error_bad_value
);
11227 while (h
->root
.type
== bfd_link_hash_indirect
11228 || h
->root
.type
== bfd_link_hash_warning
)
11229 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11233 /* If a plugin symbol is referenced from a non-IR file,
11234 mark the symbol as undefined. Note that the
11235 linker may attach linker created dynamic sections
11236 to the plugin bfd. Symbols defined in linker
11237 created sections are not plugin symbols. */
11238 if ((h
->root
.non_ir_ref_regular
11239 || h
->root
.non_ir_ref_dynamic
)
11240 && (h
->root
.type
== bfd_link_hash_defined
11241 || h
->root
.type
== bfd_link_hash_defweak
)
11242 && (h
->root
.u
.def
.section
->flags
11243 & SEC_LINKER_CREATED
) == 0
11244 && h
->root
.u
.def
.section
->owner
!= NULL
11245 && (h
->root
.u
.def
.section
->owner
->flags
11246 & BFD_PLUGIN
) != 0)
11248 h
->root
.type
= bfd_link_hash_undefined
;
11249 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11253 if (h
->root
.type
== bfd_link_hash_defined
11254 || h
->root
.type
== bfd_link_hash_defweak
)
11255 ps
= &h
->root
.u
.def
.section
;
11257 sym_name
= h
->root
.root
.string
;
11261 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11263 s_type
= ELF_ST_TYPE (sym
->st_info
);
11264 ps
= &flinfo
->sections
[r_symndx
];
11265 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11269 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11270 && !bfd_link_relocatable (flinfo
->info
))
11273 bfd_vma dot
= (rel
->r_offset
11274 + o
->output_offset
+ o
->output_section
->vma
);
11276 printf ("Encountered a complex symbol!");
11277 printf (" (input_bfd %s, section %s, reloc %ld\n",
11278 bfd_get_filename (input_bfd
), o
->name
,
11279 (long) (rel
- internal_relocs
));
11280 printf (" symbol: idx %8.8lx, name %s\n",
11281 r_symndx
, sym_name
);
11282 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11283 (unsigned long) rel
->r_info
,
11284 (unsigned long) rel
->r_offset
);
11286 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11287 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11290 /* Symbol evaluated OK. Update to absolute value. */
11291 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11296 if (action_discarded
!= -1 && ps
!= NULL
)
11298 /* Complain if the definition comes from a
11299 discarded section. */
11300 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11302 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11303 if (action_discarded
& COMPLAIN
)
11304 (*flinfo
->info
->callbacks
->einfo
)
11305 /* xgettext:c-format */
11306 (_("%X`%s' referenced in section `%pA' of %pB: "
11307 "defined in discarded section `%pA' of %pB\n"),
11308 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11310 /* Try to do the best we can to support buggy old
11311 versions of gcc. Pretend that the symbol is
11312 really defined in the kept linkonce section.
11313 FIXME: This is quite broken. Modifying the
11314 symbol here means we will be changing all later
11315 uses of the symbol, not just in this section. */
11316 if (action_discarded
& PRETEND
)
11320 kept
= _bfd_elf_check_kept_section (sec
,
11332 /* Relocate the section by invoking a back end routine.
11334 The back end routine is responsible for adjusting the
11335 section contents as necessary, and (if using Rela relocs
11336 and generating a relocatable output file) adjusting the
11337 reloc addend as necessary.
11339 The back end routine does not have to worry about setting
11340 the reloc address or the reloc symbol index.
11342 The back end routine is given a pointer to the swapped in
11343 internal symbols, and can access the hash table entries
11344 for the external symbols via elf_sym_hashes (input_bfd).
11346 When generating relocatable output, the back end routine
11347 must handle STB_LOCAL/STT_SECTION symbols specially. The
11348 output symbol is going to be a section symbol
11349 corresponding to the output section, which will require
11350 the addend to be adjusted. */
11352 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11353 input_bfd
, o
, contents
,
11361 || bfd_link_relocatable (flinfo
->info
)
11362 || flinfo
->info
->emitrelocations
)
11364 Elf_Internal_Rela
*irela
;
11365 Elf_Internal_Rela
*irelaend
, *irelamid
;
11366 bfd_vma last_offset
;
11367 struct elf_link_hash_entry
**rel_hash
;
11368 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11369 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11370 unsigned int next_erel
;
11371 bfd_boolean rela_normal
;
11372 struct bfd_elf_section_data
*esdi
, *esdo
;
11374 esdi
= elf_section_data (o
);
11375 esdo
= elf_section_data (o
->output_section
);
11376 rela_normal
= FALSE
;
11378 /* Adjust the reloc addresses and symbol indices. */
11380 irela
= internal_relocs
;
11381 irelaend
= irela
+ o
->reloc_count
;
11382 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11383 /* We start processing the REL relocs, if any. When we reach
11384 IRELAMID in the loop, we switch to the RELA relocs. */
11386 if (esdi
->rel
.hdr
!= NULL
)
11387 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11388 * bed
->s
->int_rels_per_ext_rel
);
11389 rel_hash_list
= rel_hash
;
11390 rela_hash_list
= NULL
;
11391 last_offset
= o
->output_offset
;
11392 if (!bfd_link_relocatable (flinfo
->info
))
11393 last_offset
+= o
->output_section
->vma
;
11394 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11396 unsigned long r_symndx
;
11398 Elf_Internal_Sym sym
;
11400 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11406 if (irela
== irelamid
)
11408 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11409 rela_hash_list
= rel_hash
;
11410 rela_normal
= bed
->rela_normal
;
11413 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11416 if (irela
->r_offset
>= (bfd_vma
) -2)
11418 /* This is a reloc for a deleted entry or somesuch.
11419 Turn it into an R_*_NONE reloc, at the same
11420 offset as the last reloc. elf_eh_frame.c and
11421 bfd_elf_discard_info rely on reloc offsets
11423 irela
->r_offset
= last_offset
;
11425 irela
->r_addend
= 0;
11429 irela
->r_offset
+= o
->output_offset
;
11431 /* Relocs in an executable have to be virtual addresses. */
11432 if (!bfd_link_relocatable (flinfo
->info
))
11433 irela
->r_offset
+= o
->output_section
->vma
;
11435 last_offset
= irela
->r_offset
;
11437 r_symndx
= irela
->r_info
>> r_sym_shift
;
11438 if (r_symndx
== STN_UNDEF
)
11441 if (r_symndx
>= locsymcount
11442 || (elf_bad_symtab (input_bfd
)
11443 && flinfo
->sections
[r_symndx
] == NULL
))
11445 struct elf_link_hash_entry
*rh
;
11446 unsigned long indx
;
11448 /* This is a reloc against a global symbol. We
11449 have not yet output all the local symbols, so
11450 we do not know the symbol index of any global
11451 symbol. We set the rel_hash entry for this
11452 reloc to point to the global hash table entry
11453 for this symbol. The symbol index is then
11454 set at the end of bfd_elf_final_link. */
11455 indx
= r_symndx
- extsymoff
;
11456 rh
= elf_sym_hashes (input_bfd
)[indx
];
11457 while (rh
->root
.type
== bfd_link_hash_indirect
11458 || rh
->root
.type
== bfd_link_hash_warning
)
11459 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11461 /* Setting the index to -2 tells
11462 elf_link_output_extsym that this symbol is
11463 used by a reloc. */
11464 BFD_ASSERT (rh
->indx
< 0);
11471 /* This is a reloc against a local symbol. */
11474 sym
= isymbuf
[r_symndx
];
11475 sec
= flinfo
->sections
[r_symndx
];
11476 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11478 /* I suppose the backend ought to fill in the
11479 section of any STT_SECTION symbol against a
11480 processor specific section. */
11481 r_symndx
= STN_UNDEF
;
11482 if (bfd_is_abs_section (sec
))
11484 else if (sec
== NULL
|| sec
->owner
== NULL
)
11486 bfd_set_error (bfd_error_bad_value
);
11491 asection
*osec
= sec
->output_section
;
11493 /* If we have discarded a section, the output
11494 section will be the absolute section. In
11495 case of discarded SEC_MERGE sections, use
11496 the kept section. relocate_section should
11497 have already handled discarded linkonce
11499 if (bfd_is_abs_section (osec
)
11500 && sec
->kept_section
!= NULL
11501 && sec
->kept_section
->output_section
!= NULL
)
11503 osec
= sec
->kept_section
->output_section
;
11504 irela
->r_addend
-= osec
->vma
;
11507 if (!bfd_is_abs_section (osec
))
11509 r_symndx
= osec
->target_index
;
11510 if (r_symndx
== STN_UNDEF
)
11512 irela
->r_addend
+= osec
->vma
;
11513 osec
= _bfd_nearby_section (output_bfd
, osec
,
11515 irela
->r_addend
-= osec
->vma
;
11516 r_symndx
= osec
->target_index
;
11521 /* Adjust the addend according to where the
11522 section winds up in the output section. */
11524 irela
->r_addend
+= sec
->output_offset
;
11528 if (flinfo
->indices
[r_symndx
] == -1)
11530 unsigned long shlink
;
11535 if (flinfo
->info
->strip
== strip_all
)
11537 /* You can't do ld -r -s. */
11538 bfd_set_error (bfd_error_invalid_operation
);
11542 /* This symbol was skipped earlier, but
11543 since it is needed by a reloc, we
11544 must output it now. */
11545 shlink
= symtab_hdr
->sh_link
;
11546 name
= (bfd_elf_string_from_elf_section
11547 (input_bfd
, shlink
, sym
.st_name
));
11551 osec
= sec
->output_section
;
11553 _bfd_elf_section_from_bfd_section (output_bfd
,
11555 if (sym
.st_shndx
== SHN_BAD
)
11558 sym
.st_value
+= sec
->output_offset
;
11559 if (!bfd_link_relocatable (flinfo
->info
))
11561 sym
.st_value
+= osec
->vma
;
11562 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11564 struct elf_link_hash_table
*htab
11565 = elf_hash_table (flinfo
->info
);
11567 /* STT_TLS symbols are relative to PT_TLS
11569 if (htab
->tls_sec
!= NULL
)
11570 sym
.st_value
-= htab
->tls_sec
->vma
;
11573 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11578 indx
= bfd_get_symcount (output_bfd
);
11579 ret
= elf_link_output_symstrtab (flinfo
, name
,
11585 flinfo
->indices
[r_symndx
] = indx
;
11590 r_symndx
= flinfo
->indices
[r_symndx
];
11593 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11594 | (irela
->r_info
& r_type_mask
));
11597 /* Swap out the relocs. */
11598 input_rel_hdr
= esdi
->rel
.hdr
;
11599 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11601 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11606 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11607 * bed
->s
->int_rels_per_ext_rel
);
11608 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11611 input_rela_hdr
= esdi
->rela
.hdr
;
11612 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11614 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11623 /* Write out the modified section contents. */
11624 if (bed
->elf_backend_write_section
11625 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11628 /* Section written out. */
11630 else switch (o
->sec_info_type
)
11632 case SEC_INFO_TYPE_STABS
:
11633 if (! (_bfd_write_section_stabs
11635 &elf_hash_table (flinfo
->info
)->stab_info
,
11636 o
, &elf_section_data (o
)->sec_info
, contents
)))
11639 case SEC_INFO_TYPE_MERGE
:
11640 if (! _bfd_write_merged_section (output_bfd
, o
,
11641 elf_section_data (o
)->sec_info
))
11644 case SEC_INFO_TYPE_EH_FRAME
:
11646 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11651 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11653 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11661 if (! (o
->flags
& SEC_EXCLUDE
))
11663 file_ptr offset
= (file_ptr
) o
->output_offset
;
11664 bfd_size_type todo
= o
->size
;
11666 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11668 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11670 /* Reverse-copy input section to output. */
11673 todo
-= address_size
;
11674 if (! bfd_set_section_contents (output_bfd
,
11682 offset
+= address_size
;
11686 else if (! bfd_set_section_contents (output_bfd
,
11700 /* Generate a reloc when linking an ELF file. This is a reloc
11701 requested by the linker, and does not come from any input file. This
11702 is used to build constructor and destructor tables when linking
11706 elf_reloc_link_order (bfd
*output_bfd
,
11707 struct bfd_link_info
*info
,
11708 asection
*output_section
,
11709 struct bfd_link_order
*link_order
)
11711 reloc_howto_type
*howto
;
11715 struct bfd_elf_section_reloc_data
*reldata
;
11716 struct elf_link_hash_entry
**rel_hash_ptr
;
11717 Elf_Internal_Shdr
*rel_hdr
;
11718 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11719 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11722 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11724 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11727 bfd_set_error (bfd_error_bad_value
);
11731 addend
= link_order
->u
.reloc
.p
->addend
;
11734 reldata
= &esdo
->rel
;
11735 else if (esdo
->rela
.hdr
)
11736 reldata
= &esdo
->rela
;
11743 /* Figure out the symbol index. */
11744 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11745 if (link_order
->type
== bfd_section_reloc_link_order
)
11747 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11748 BFD_ASSERT (indx
!= 0);
11749 *rel_hash_ptr
= NULL
;
11753 struct elf_link_hash_entry
*h
;
11755 /* Treat a reloc against a defined symbol as though it were
11756 actually against the section. */
11757 h
= ((struct elf_link_hash_entry
*)
11758 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11759 link_order
->u
.reloc
.p
->u
.name
,
11760 FALSE
, FALSE
, TRUE
));
11762 && (h
->root
.type
== bfd_link_hash_defined
11763 || h
->root
.type
== bfd_link_hash_defweak
))
11767 section
= h
->root
.u
.def
.section
;
11768 indx
= section
->output_section
->target_index
;
11769 *rel_hash_ptr
= NULL
;
11770 /* It seems that we ought to add the symbol value to the
11771 addend here, but in practice it has already been added
11772 because it was passed to constructor_callback. */
11773 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11775 else if (h
!= NULL
)
11777 /* Setting the index to -2 tells elf_link_output_extsym that
11778 this symbol is used by a reloc. */
11785 (*info
->callbacks
->unattached_reloc
)
11786 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11791 /* If this is an inplace reloc, we must write the addend into the
11793 if (howto
->partial_inplace
&& addend
!= 0)
11795 bfd_size_type size
;
11796 bfd_reloc_status_type rstat
;
11799 const char *sym_name
;
11800 bfd_size_type octets
;
11802 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11803 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11804 if (buf
== NULL
&& size
!= 0)
11806 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11813 case bfd_reloc_outofrange
:
11816 case bfd_reloc_overflow
:
11817 if (link_order
->type
== bfd_section_reloc_link_order
)
11818 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11820 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11821 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11822 howto
->name
, addend
, NULL
, NULL
,
11827 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11829 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11836 /* The address of a reloc is relative to the section in a
11837 relocatable file, and is a virtual address in an executable
11839 offset
= link_order
->offset
;
11840 if (! bfd_link_relocatable (info
))
11841 offset
+= output_section
->vma
;
11843 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11845 irel
[i
].r_offset
= offset
;
11846 irel
[i
].r_info
= 0;
11847 irel
[i
].r_addend
= 0;
11849 if (bed
->s
->arch_size
== 32)
11850 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11852 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11854 rel_hdr
= reldata
->hdr
;
11855 erel
= rel_hdr
->contents
;
11856 if (rel_hdr
->sh_type
== SHT_REL
)
11858 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11859 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11863 irel
[0].r_addend
= addend
;
11864 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11865 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11873 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11874 Returns TRUE upon success, FALSE otherwise. */
11877 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11879 bfd_boolean ret
= FALSE
;
11881 const struct elf_backend_data
*bed
;
11883 enum bfd_architecture arch
;
11885 asymbol
**sympp
= NULL
;
11889 elf_symbol_type
*osymbuf
;
11892 implib_bfd
= info
->out_implib_bfd
;
11893 bed
= get_elf_backend_data (abfd
);
11895 if (!bfd_set_format (implib_bfd
, bfd_object
))
11898 /* Use flag from executable but make it a relocatable object. */
11899 flags
= bfd_get_file_flags (abfd
);
11900 flags
&= ~HAS_RELOC
;
11901 if (!bfd_set_start_address (implib_bfd
, 0)
11902 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11905 /* Copy architecture of output file to import library file. */
11906 arch
= bfd_get_arch (abfd
);
11907 mach
= bfd_get_mach (abfd
);
11908 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11909 && (abfd
->target_defaulted
11910 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11913 /* Get symbol table size. */
11914 symsize
= bfd_get_symtab_upper_bound (abfd
);
11918 /* Read in the symbol table. */
11919 sympp
= (asymbol
**) bfd_malloc (symsize
);
11923 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11927 /* Allow the BFD backend to copy any private header data it
11928 understands from the output BFD to the import library BFD. */
11929 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11932 /* Filter symbols to appear in the import library. */
11933 if (bed
->elf_backend_filter_implib_symbols
)
11934 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11937 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11940 bfd_set_error (bfd_error_no_symbols
);
11941 _bfd_error_handler (_("%pB: no symbol found for import library"),
11947 /* Make symbols absolute. */
11948 amt
= symcount
* sizeof (*osymbuf
);
11949 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11950 if (osymbuf
== NULL
)
11953 for (src_count
= 0; src_count
< symcount
; src_count
++)
11955 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11956 sizeof (*osymbuf
));
11957 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11958 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11959 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11960 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11961 osymbuf
[src_count
].symbol
.value
;
11962 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11965 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
11967 /* Allow the BFD backend to copy any private data it understands
11968 from the output BFD to the import library BFD. This is done last
11969 to permit the routine to look at the filtered symbol table. */
11970 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
11973 if (!bfd_close (implib_bfd
))
11984 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
11988 if (flinfo
->symstrtab
!= NULL
)
11989 _bfd_elf_strtab_free (flinfo
->symstrtab
);
11990 free (flinfo
->contents
);
11991 free (flinfo
->external_relocs
);
11992 free (flinfo
->internal_relocs
);
11993 free (flinfo
->external_syms
);
11994 free (flinfo
->locsym_shndx
);
11995 free (flinfo
->internal_syms
);
11996 free (flinfo
->indices
);
11997 free (flinfo
->sections
);
11998 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
11999 free (flinfo
->symshndxbuf
);
12000 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
12002 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12003 free (esdo
->rel
.hashes
);
12004 free (esdo
->rela
.hashes
);
12008 /* Do the final step of an ELF link. */
12011 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12013 bfd_boolean dynamic
;
12014 bfd_boolean emit_relocs
;
12016 struct elf_final_link_info flinfo
;
12018 struct bfd_link_order
*p
;
12020 bfd_size_type max_contents_size
;
12021 bfd_size_type max_external_reloc_size
;
12022 bfd_size_type max_internal_reloc_count
;
12023 bfd_size_type max_sym_count
;
12024 bfd_size_type max_sym_shndx_count
;
12025 Elf_Internal_Sym elfsym
;
12027 Elf_Internal_Shdr
*symtab_hdr
;
12028 Elf_Internal_Shdr
*symtab_shndx_hdr
;
12029 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12030 struct elf_outext_info eoinfo
;
12031 bfd_boolean merged
;
12032 size_t relativecount
= 0;
12033 asection
*reldyn
= 0;
12035 asection
*attr_section
= NULL
;
12036 bfd_vma attr_size
= 0;
12037 const char *std_attrs_section
;
12038 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
12039 bfd_boolean sections_removed
;
12042 if (!is_elf_hash_table (htab
))
12045 if (bfd_link_pic (info
))
12046 abfd
->flags
|= DYNAMIC
;
12048 dynamic
= htab
->dynamic_sections_created
;
12049 dynobj
= htab
->dynobj
;
12051 emit_relocs
= (bfd_link_relocatable (info
)
12052 || info
->emitrelocations
);
12054 memset (&flinfo
, 0, sizeof (flinfo
));
12055 flinfo
.info
= info
;
12056 flinfo
.output_bfd
= abfd
;
12057 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
12058 if (flinfo
.symstrtab
== NULL
)
12063 flinfo
.hash_sec
= NULL
;
12064 flinfo
.symver_sec
= NULL
;
12068 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
12069 /* Note that dynsym_sec can be NULL (on VMS). */
12070 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
12071 /* Note that it is OK if symver_sec is NULL. */
12074 if (info
->unique_symbol
12075 && !bfd_hash_table_init (&flinfo
.local_hash_table
,
12076 local_hash_newfunc
,
12077 sizeof (struct local_hash_entry
)))
12080 /* The object attributes have been merged. Remove the input
12081 sections from the link, and set the contents of the output
12083 sections_removed
= FALSE
;
12084 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
12085 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12087 bfd_boolean remove_section
= FALSE
;
12089 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
12090 || strcmp (o
->name
, ".gnu.attributes") == 0)
12092 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12094 asection
*input_section
;
12096 if (p
->type
!= bfd_indirect_link_order
)
12098 input_section
= p
->u
.indirect
.section
;
12099 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12100 elf_link_input_bfd ignores this section. */
12101 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12104 attr_size
= bfd_elf_obj_attr_size (abfd
);
12105 bfd_set_section_size (o
, attr_size
);
12106 /* Skip this section later on. */
12107 o
->map_head
.link_order
= NULL
;
12111 remove_section
= TRUE
;
12113 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12115 /* Remove empty group section from linker output. */
12116 remove_section
= TRUE
;
12118 if (remove_section
)
12120 o
->flags
|= SEC_EXCLUDE
;
12121 bfd_section_list_remove (abfd
, o
);
12122 abfd
->section_count
--;
12123 sections_removed
= TRUE
;
12126 if (sections_removed
)
12127 _bfd_fix_excluded_sec_syms (abfd
, info
);
12129 /* Count up the number of relocations we will output for each output
12130 section, so that we know the sizes of the reloc sections. We
12131 also figure out some maximum sizes. */
12132 max_contents_size
= 0;
12133 max_external_reloc_size
= 0;
12134 max_internal_reloc_count
= 0;
12136 max_sym_shndx_count
= 0;
12138 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12140 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12141 o
->reloc_count
= 0;
12143 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12145 unsigned int reloc_count
= 0;
12146 unsigned int additional_reloc_count
= 0;
12147 struct bfd_elf_section_data
*esdi
= NULL
;
12149 if (p
->type
== bfd_section_reloc_link_order
12150 || p
->type
== bfd_symbol_reloc_link_order
)
12152 else if (p
->type
== bfd_indirect_link_order
)
12156 sec
= p
->u
.indirect
.section
;
12158 /* Mark all sections which are to be included in the
12159 link. This will normally be every section. We need
12160 to do this so that we can identify any sections which
12161 the linker has decided to not include. */
12162 sec
->linker_mark
= TRUE
;
12164 if (sec
->flags
& SEC_MERGE
)
12167 if (sec
->rawsize
> max_contents_size
)
12168 max_contents_size
= sec
->rawsize
;
12169 if (sec
->size
> max_contents_size
)
12170 max_contents_size
= sec
->size
;
12172 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12173 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12177 /* We are interested in just local symbols, not all
12179 if (elf_bad_symtab (sec
->owner
))
12180 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12181 / bed
->s
->sizeof_sym
);
12183 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12185 if (sym_count
> max_sym_count
)
12186 max_sym_count
= sym_count
;
12188 if (sym_count
> max_sym_shndx_count
12189 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12190 max_sym_shndx_count
= sym_count
;
12192 if (esdo
->this_hdr
.sh_type
== SHT_REL
12193 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12194 /* Some backends use reloc_count in relocation sections
12195 to count particular types of relocs. Of course,
12196 reloc sections themselves can't have relocations. */
12198 else if (emit_relocs
)
12200 reloc_count
= sec
->reloc_count
;
12201 if (bed
->elf_backend_count_additional_relocs
)
12204 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12205 additional_reloc_count
+= c
;
12208 else if (bed
->elf_backend_count_relocs
)
12209 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12211 esdi
= elf_section_data (sec
);
12213 if ((sec
->flags
& SEC_RELOC
) != 0)
12215 size_t ext_size
= 0;
12217 if (esdi
->rel
.hdr
!= NULL
)
12218 ext_size
= esdi
->rel
.hdr
->sh_size
;
12219 if (esdi
->rela
.hdr
!= NULL
)
12220 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12222 if (ext_size
> max_external_reloc_size
)
12223 max_external_reloc_size
= ext_size
;
12224 if (sec
->reloc_count
> max_internal_reloc_count
)
12225 max_internal_reloc_count
= sec
->reloc_count
;
12230 if (reloc_count
== 0)
12233 reloc_count
+= additional_reloc_count
;
12234 o
->reloc_count
+= reloc_count
;
12236 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12240 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12241 esdo
->rel
.count
+= additional_reloc_count
;
12243 if (esdi
->rela
.hdr
)
12245 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12246 esdo
->rela
.count
+= additional_reloc_count
;
12252 esdo
->rela
.count
+= reloc_count
;
12254 esdo
->rel
.count
+= reloc_count
;
12258 if (o
->reloc_count
> 0)
12259 o
->flags
|= SEC_RELOC
;
12262 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12263 set it (this is probably a bug) and if it is set
12264 assign_section_numbers will create a reloc section. */
12265 o
->flags
&=~ SEC_RELOC
;
12268 /* If the SEC_ALLOC flag is not set, force the section VMA to
12269 zero. This is done in elf_fake_sections as well, but forcing
12270 the VMA to 0 here will ensure that relocs against these
12271 sections are handled correctly. */
12272 if ((o
->flags
& SEC_ALLOC
) == 0
12273 && ! o
->user_set_vma
)
12277 if (! bfd_link_relocatable (info
) && merged
)
12278 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12280 /* Figure out the file positions for everything but the symbol table
12281 and the relocs. We set symcount to force assign_section_numbers
12282 to create a symbol table. */
12283 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12284 BFD_ASSERT (! abfd
->output_has_begun
);
12285 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12288 /* Set sizes, and assign file positions for reloc sections. */
12289 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12291 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12292 if ((o
->flags
& SEC_RELOC
) != 0)
12295 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12299 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12303 /* _bfd_elf_compute_section_file_positions makes temporary use
12304 of target_index. Reset it. */
12305 o
->target_index
= 0;
12307 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12308 to count upwards while actually outputting the relocations. */
12309 esdo
->rel
.count
= 0;
12310 esdo
->rela
.count
= 0;
12312 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12313 && !bfd_section_is_ctf (o
))
12315 /* Cache the section contents so that they can be compressed
12316 later. Use bfd_malloc since it will be freed by
12317 bfd_compress_section_contents. */
12318 unsigned char *contents
= esdo
->this_hdr
.contents
;
12319 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12322 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12323 if (contents
== NULL
)
12325 esdo
->this_hdr
.contents
= contents
;
12329 /* We have now assigned file positions for all the sections except .symtab,
12330 .strtab, and non-loaded reloc and compressed debugging sections. We start
12331 the .symtab section at the current file position, and write directly to it.
12332 We build the .strtab section in memory. */
12333 abfd
->symcount
= 0;
12334 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12335 /* sh_name is set in prep_headers. */
12336 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12337 /* sh_flags, sh_addr and sh_size all start off zero. */
12338 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12339 /* sh_link is set in assign_section_numbers. */
12340 /* sh_info is set below. */
12341 /* sh_offset is set just below. */
12342 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12344 if (max_sym_count
< 20)
12345 max_sym_count
= 20;
12346 htab
->strtabsize
= max_sym_count
;
12347 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12348 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12349 if (htab
->strtab
== NULL
)
12351 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12353 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12354 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12356 if (info
->strip
!= strip_all
|| emit_relocs
)
12358 file_ptr off
= elf_next_file_pos (abfd
);
12360 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
12362 /* Note that at this point elf_next_file_pos (abfd) is
12363 incorrect. We do not yet know the size of the .symtab section.
12364 We correct next_file_pos below, after we do know the size. */
12366 /* Start writing out the symbol table. The first symbol is always a
12368 elfsym
.st_value
= 0;
12369 elfsym
.st_size
= 0;
12370 elfsym
.st_info
= 0;
12371 elfsym
.st_other
= 0;
12372 elfsym
.st_shndx
= SHN_UNDEF
;
12373 elfsym
.st_target_internal
= 0;
12374 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12375 bfd_und_section_ptr
, NULL
) != 1)
12378 /* Output a symbol for each section if asked or they are used for
12379 relocs. These symbols usually have no names. We store the
12380 index of each one in the index field of the section, so that
12381 we can find it again when outputting relocs. */
12383 if (bfd_keep_unused_section_symbols (abfd
) || emit_relocs
)
12385 bfd_boolean name_local_sections
12386 = (bed
->elf_backend_name_local_section_symbols
12387 && bed
->elf_backend_name_local_section_symbols (abfd
));
12388 const char *name
= NULL
;
12390 elfsym
.st_size
= 0;
12391 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12392 elfsym
.st_other
= 0;
12393 elfsym
.st_value
= 0;
12394 elfsym
.st_target_internal
= 0;
12395 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12397 o
= bfd_section_from_elf_index (abfd
, i
);
12400 o
->target_index
= bfd_get_symcount (abfd
);
12401 elfsym
.st_shndx
= i
;
12402 if (!bfd_link_relocatable (info
))
12403 elfsym
.st_value
= o
->vma
;
12404 if (name_local_sections
)
12406 if (elf_link_output_symstrtab (&flinfo
, name
, &elfsym
, o
,
12414 /* On some targets like Irix 5 the symbol split between local and global
12415 ones recorded in the sh_info field needs to be done between section
12416 and all other symbols. */
12417 if (bed
->elf_backend_elfsym_local_is_section
12418 && bed
->elf_backend_elfsym_local_is_section (abfd
))
12419 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12421 /* Allocate some memory to hold information read in from the input
12423 if (max_contents_size
!= 0)
12425 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12426 if (flinfo
.contents
== NULL
)
12430 if (max_external_reloc_size
!= 0)
12432 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12433 if (flinfo
.external_relocs
== NULL
)
12437 if (max_internal_reloc_count
!= 0)
12439 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12440 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12441 if (flinfo
.internal_relocs
== NULL
)
12445 if (max_sym_count
!= 0)
12447 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12448 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12449 if (flinfo
.external_syms
== NULL
)
12452 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12453 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12454 if (flinfo
.internal_syms
== NULL
)
12457 amt
= max_sym_count
* sizeof (long);
12458 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12459 if (flinfo
.indices
== NULL
)
12462 amt
= max_sym_count
* sizeof (asection
*);
12463 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12464 if (flinfo
.sections
== NULL
)
12468 if (max_sym_shndx_count
!= 0)
12470 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12471 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12472 if (flinfo
.locsym_shndx
== NULL
)
12478 bfd_vma base
, end
= 0; /* Both bytes. */
12481 for (sec
= htab
->tls_sec
;
12482 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12485 bfd_size_type size
= sec
->size
;
12486 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12489 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12491 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12494 size
= ord
->offset
* opb
+ ord
->size
;
12496 end
= sec
->vma
+ size
/ opb
;
12498 base
= htab
->tls_sec
->vma
;
12499 /* Only align end of TLS section if static TLS doesn't have special
12500 alignment requirements. */
12501 if (bed
->static_tls_alignment
== 1)
12502 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12503 htab
->tls_size
= end
- base
;
12506 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12509 /* Since ELF permits relocations to be against local symbols, we
12510 must have the local symbols available when we do the relocations.
12511 Since we would rather only read the local symbols once, and we
12512 would rather not keep them in memory, we handle all the
12513 relocations for a single input file at the same time.
12515 Unfortunately, there is no way to know the total number of local
12516 symbols until we have seen all of them, and the local symbol
12517 indices precede the global symbol indices. This means that when
12518 we are generating relocatable output, and we see a reloc against
12519 a global symbol, we can not know the symbol index until we have
12520 finished examining all the local symbols to see which ones we are
12521 going to output. To deal with this, we keep the relocations in
12522 memory, and don't output them until the end of the link. This is
12523 an unfortunate waste of memory, but I don't see a good way around
12524 it. Fortunately, it only happens when performing a relocatable
12525 link, which is not the common case. FIXME: If keep_memory is set
12526 we could write the relocs out and then read them again; I don't
12527 know how bad the memory loss will be. */
12529 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12530 sub
->output_has_begun
= FALSE
;
12531 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12533 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12535 if (p
->type
== bfd_indirect_link_order
12536 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12537 == bfd_target_elf_flavour
)
12538 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12540 if (! sub
->output_has_begun
)
12542 if (! elf_link_input_bfd (&flinfo
, sub
))
12544 sub
->output_has_begun
= TRUE
;
12547 else if (p
->type
== bfd_section_reloc_link_order
12548 || p
->type
== bfd_symbol_reloc_link_order
)
12550 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12555 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12557 if (p
->type
== bfd_indirect_link_order
12558 && (bfd_get_flavour (sub
)
12559 == bfd_target_elf_flavour
)
12560 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12561 != bed
->s
->elfclass
))
12563 const char *iclass
, *oclass
;
12565 switch (bed
->s
->elfclass
)
12567 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12568 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12569 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12573 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12575 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12576 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12577 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12581 bfd_set_error (bfd_error_wrong_format
);
12583 /* xgettext:c-format */
12584 (_("%pB: file class %s incompatible with %s"),
12585 sub
, iclass
, oclass
);
12594 /* Free symbol buffer if needed. */
12595 if (!info
->reduce_memory_overheads
)
12597 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12598 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12600 free (elf_tdata (sub
)->symbuf
);
12601 elf_tdata (sub
)->symbuf
= NULL
;
12607 /* Output any global symbols that got converted to local in a
12608 version script or due to symbol visibility. We do this in a
12609 separate step since ELF requires all local symbols to appear
12610 prior to any global symbols. FIXME: We should only do this if
12611 some global symbols were, in fact, converted to become local.
12612 FIXME: Will this work correctly with the Irix 5 linker? */
12613 eoinfo
.failed
= FALSE
;
12614 eoinfo
.flinfo
= &flinfo
;
12615 eoinfo
.localsyms
= TRUE
;
12616 eoinfo
.file_sym_done
= FALSE
;
12617 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12621 goto return_local_hash_table
;
12624 /* If backend needs to output some local symbols not present in the hash
12625 table, do it now. */
12626 if (bed
->elf_backend_output_arch_local_syms
12627 && (info
->strip
!= strip_all
|| emit_relocs
))
12629 typedef int (*out_sym_func
)
12630 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12631 struct elf_link_hash_entry
*);
12633 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12634 (abfd
, info
, &flinfo
,
12635 (out_sym_func
) elf_link_output_symstrtab
)))
12638 goto return_local_hash_table
;
12642 /* That wrote out all the local symbols. Finish up the symbol table
12643 with the global symbols. Even if we want to strip everything we
12644 can, we still need to deal with those global symbols that got
12645 converted to local in a version script. */
12647 /* The sh_info field records the index of the first non local symbol. */
12648 if (!symtab_hdr
->sh_info
)
12649 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12652 && htab
->dynsym
!= NULL
12653 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12655 Elf_Internal_Sym sym
;
12656 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12658 o
= htab
->dynsym
->output_section
;
12659 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12661 /* Write out the section symbols for the output sections. */
12662 if (bfd_link_pic (info
)
12663 || htab
->is_relocatable_executable
)
12669 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12671 sym
.st_target_internal
= 0;
12673 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12679 dynindx
= elf_section_data (s
)->dynindx
;
12682 indx
= elf_section_data (s
)->this_idx
;
12683 BFD_ASSERT (indx
> 0);
12684 sym
.st_shndx
= indx
;
12685 if (! check_dynsym (abfd
, &sym
))
12688 goto return_local_hash_table
;
12690 sym
.st_value
= s
->vma
;
12691 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12693 /* Inform the linker of the addition of this symbol. */
12695 if (info
->callbacks
->ctf_new_dynsym
)
12696 info
->callbacks
->ctf_new_dynsym (dynindx
, &sym
);
12698 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12702 /* Write out the local dynsyms. */
12703 if (htab
->dynlocal
)
12705 struct elf_link_local_dynamic_entry
*e
;
12706 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12711 /* Copy the internal symbol and turn off visibility.
12712 Note that we saved a word of storage and overwrote
12713 the original st_name with the dynstr_index. */
12715 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12716 sym
.st_shndx
= SHN_UNDEF
;
12718 s
= bfd_section_from_elf_index (e
->input_bfd
,
12721 && s
->output_section
!= NULL
12722 && elf_section_data (s
->output_section
) != NULL
)
12725 elf_section_data (s
->output_section
)->this_idx
;
12726 if (! check_dynsym (abfd
, &sym
))
12729 goto return_local_hash_table
;
12731 sym
.st_value
= (s
->output_section
->vma
12733 + e
->isym
.st_value
);
12736 /* Inform the linker of the addition of this symbol. */
12738 if (info
->callbacks
->ctf_new_dynsym
)
12739 info
->callbacks
->ctf_new_dynsym (e
->dynindx
, &sym
);
12741 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12742 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12747 /* We get the global symbols from the hash table. */
12748 eoinfo
.failed
= FALSE
;
12749 eoinfo
.localsyms
= FALSE
;
12750 eoinfo
.flinfo
= &flinfo
;
12751 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12755 goto return_local_hash_table
;
12758 /* If backend needs to output some symbols not present in the hash
12759 table, do it now. */
12760 if (bed
->elf_backend_output_arch_syms
12761 && (info
->strip
!= strip_all
|| emit_relocs
))
12763 typedef int (*out_sym_func
)
12764 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12765 struct elf_link_hash_entry
*);
12767 if (! ((*bed
->elf_backend_output_arch_syms
)
12768 (abfd
, info
, &flinfo
,
12769 (out_sym_func
) elf_link_output_symstrtab
)))
12772 goto return_local_hash_table
;
12776 /* Finalize the .strtab section. */
12777 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12779 /* Swap out the .strtab section. */
12780 if (!elf_link_swap_symbols_out (&flinfo
))
12783 goto return_local_hash_table
;
12786 /* Now we know the size of the symtab section. */
12787 if (bfd_get_symcount (abfd
) > 0)
12789 /* Finish up and write out the symbol string table (.strtab)
12791 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12792 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12794 if (elf_symtab_shndx_list (abfd
))
12796 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12798 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12800 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12801 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12802 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12803 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12804 symtab_shndx_hdr
->sh_size
= amt
;
12806 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12809 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12810 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12813 goto return_local_hash_table
;
12818 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12819 /* sh_name was set in prep_headers. */
12820 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12821 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12822 symstrtab_hdr
->sh_addr
= 0;
12823 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12824 symstrtab_hdr
->sh_entsize
= 0;
12825 symstrtab_hdr
->sh_link
= 0;
12826 symstrtab_hdr
->sh_info
= 0;
12827 /* sh_offset is set just below. */
12828 symstrtab_hdr
->sh_addralign
= 1;
12830 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12832 elf_next_file_pos (abfd
) = off
;
12834 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12835 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12838 goto return_local_hash_table
;
12842 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12844 _bfd_error_handler (_("%pB: failed to generate import library"),
12845 info
->out_implib_bfd
);
12847 goto return_local_hash_table
;
12850 /* Adjust the relocs to have the correct symbol indices. */
12851 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12853 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12856 if ((o
->flags
& SEC_RELOC
) == 0)
12859 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12860 if (esdo
->rel
.hdr
!= NULL
12861 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12864 goto return_local_hash_table
;
12866 if (esdo
->rela
.hdr
!= NULL
12867 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12870 goto return_local_hash_table
;
12873 /* Set the reloc_count field to 0 to prevent write_relocs from
12874 trying to swap the relocs out itself. */
12875 o
->reloc_count
= 0;
12878 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12879 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12881 /* If we are linking against a dynamic object, or generating a
12882 shared library, finish up the dynamic linking information. */
12885 bfd_byte
*dyncon
, *dynconend
;
12887 /* Fix up .dynamic entries. */
12888 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12889 BFD_ASSERT (o
!= NULL
);
12891 dyncon
= o
->contents
;
12892 dynconend
= o
->contents
+ o
->size
;
12893 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12895 Elf_Internal_Dyn dyn
;
12898 bfd_size_type sh_size
;
12901 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12908 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12910 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12912 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12913 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12916 dyn
.d_un
.d_val
= relativecount
;
12923 name
= info
->init_function
;
12926 name
= info
->fini_function
;
12929 struct elf_link_hash_entry
*h
;
12931 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
12933 && (h
->root
.type
== bfd_link_hash_defined
12934 || h
->root
.type
== bfd_link_hash_defweak
))
12936 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12937 o
= h
->root
.u
.def
.section
;
12938 if (o
->output_section
!= NULL
)
12939 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12940 + o
->output_offset
);
12943 /* The symbol is imported from another shared
12944 library and does not apply to this one. */
12945 dyn
.d_un
.d_ptr
= 0;
12952 case DT_PREINIT_ARRAYSZ
:
12953 name
= ".preinit_array";
12955 case DT_INIT_ARRAYSZ
:
12956 name
= ".init_array";
12958 case DT_FINI_ARRAYSZ
:
12959 name
= ".fini_array";
12961 o
= bfd_get_section_by_name (abfd
, name
);
12965 (_("could not find section %s"), name
);
12970 (_("warning: %s section has zero size"), name
);
12971 dyn
.d_un
.d_val
= o
->size
;
12974 case DT_PREINIT_ARRAY
:
12975 name
= ".preinit_array";
12977 case DT_INIT_ARRAY
:
12978 name
= ".init_array";
12980 case DT_FINI_ARRAY
:
12981 name
= ".fini_array";
12983 o
= bfd_get_section_by_name (abfd
, name
);
12990 name
= ".gnu.hash";
12999 name
= ".gnu.version_d";
13002 name
= ".gnu.version_r";
13005 name
= ".gnu.version";
13007 o
= bfd_get_linker_section (dynobj
, name
);
13009 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
13012 (_("could not find section %s"), name
);
13015 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
13018 (_("warning: section '%s' is being made into a note"), name
);
13019 bfd_set_error (bfd_error_nonrepresentable_section
);
13022 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
13029 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
13035 for (i
= 1; i
< elf_numsections (abfd
); i
++)
13037 Elf_Internal_Shdr
*hdr
;
13039 hdr
= elf_elfsections (abfd
)[i
];
13040 if (hdr
->sh_type
== type
13041 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
13043 sh_size
+= hdr
->sh_size
;
13045 || sh_addr
> hdr
->sh_addr
)
13046 sh_addr
= hdr
->sh_addr
;
13050 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
13052 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
13054 /* Don't count procedure linkage table relocs in the
13055 overall reloc count. */
13056 sh_size
-= htab
->srelplt
->size
;
13058 /* If the size is zero, make the address zero too.
13059 This is to avoid a glibc bug. If the backend
13060 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
13061 zero, then we'll put DT_RELA at the end of
13062 DT_JMPREL. glibc will interpret the end of
13063 DT_RELA matching the end of DT_JMPREL as the
13064 case where DT_RELA includes DT_JMPREL, and for
13065 LD_BIND_NOW will decide that processing DT_RELA
13066 will process the PLT relocs too. Net result:
13067 No PLT relocs applied. */
13070 /* If .rela.plt is the first .rela section, exclude
13071 it from DT_RELA. */
13072 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
13073 + htab
->srelplt
->output_offset
) * opb
)
13074 sh_addr
+= htab
->srelplt
->size
;
13077 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
13078 dyn
.d_un
.d_val
= sh_size
;
13080 dyn
.d_un
.d_ptr
= sh_addr
;
13083 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13087 /* If we have created any dynamic sections, then output them. */
13088 if (dynobj
!= NULL
)
13090 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
13093 /* Check for DT_TEXTREL (late, in case the backend removes it). */
13094 if (bfd_link_textrel_check (info
)
13095 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
13097 bfd_byte
*dyncon
, *dynconend
;
13099 dyncon
= o
->contents
;
13100 dynconend
= o
->contents
+ o
->size
;
13101 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13103 Elf_Internal_Dyn dyn
;
13105 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13107 if (dyn
.d_tag
== DT_TEXTREL
)
13109 if (info
->textrel_check
== textrel_check_error
)
13110 info
->callbacks
->einfo
13111 (_("%P%X: read-only segment has dynamic relocations\n"));
13112 else if (bfd_link_dll (info
))
13113 info
->callbacks
->einfo
13114 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
13116 info
->callbacks
->einfo
13117 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
13123 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
13125 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
13127 || o
->output_section
== bfd_abs_section_ptr
)
13129 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
13131 /* At this point, we are only interested in sections
13132 created by _bfd_elf_link_create_dynamic_sections. */
13135 if (htab
->stab_info
.stabstr
== o
)
13137 if (htab
->eh_info
.hdr_sec
== o
)
13139 if (strcmp (o
->name
, ".dynstr") != 0)
13141 bfd_size_type octets
= ((file_ptr
) o
->output_offset
13142 * bfd_octets_per_byte (abfd
, o
));
13143 if (!bfd_set_section_contents (abfd
, o
->output_section
,
13144 o
->contents
, octets
, o
->size
))
13149 /* The contents of the .dynstr section are actually in a
13153 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
13154 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
13155 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13161 if (!info
->resolve_section_groups
)
13163 bfd_boolean failed
= FALSE
;
13165 BFD_ASSERT (bfd_link_relocatable (info
));
13166 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13171 /* If we have optimized stabs strings, output them. */
13172 if (htab
->stab_info
.stabstr
!= NULL
)
13174 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13178 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13181 if (info
->callbacks
->emit_ctf
)
13182 info
->callbacks
->emit_ctf ();
13184 elf_final_link_free (abfd
, &flinfo
);
13188 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13189 if (contents
== NULL
)
13191 /* Bail out and fail. */
13193 goto return_local_hash_table
;
13195 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13196 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13200 return_local_hash_table
:
13201 if (info
->unique_symbol
)
13202 bfd_hash_table_free (&flinfo
.local_hash_table
);
13206 elf_final_link_free (abfd
, &flinfo
);
13208 goto return_local_hash_table
;
13211 /* Initialize COOKIE for input bfd ABFD. */
13214 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13215 struct bfd_link_info
*info
, bfd
*abfd
)
13217 Elf_Internal_Shdr
*symtab_hdr
;
13218 const struct elf_backend_data
*bed
;
13220 bed
= get_elf_backend_data (abfd
);
13221 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13223 cookie
->abfd
= abfd
;
13224 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13225 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13226 if (cookie
->bad_symtab
)
13228 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13229 cookie
->extsymoff
= 0;
13233 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13234 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13237 if (bed
->s
->arch_size
== 32)
13238 cookie
->r_sym_shift
= 8;
13240 cookie
->r_sym_shift
= 32;
13242 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13243 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13245 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13246 cookie
->locsymcount
, 0,
13248 if (cookie
->locsyms
== NULL
)
13250 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13253 if (info
->keep_memory
)
13254 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13259 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13262 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13264 Elf_Internal_Shdr
*symtab_hdr
;
13266 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13267 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13268 free (cookie
->locsyms
);
13271 /* Initialize the relocation information in COOKIE for input section SEC
13272 of input bfd ABFD. */
13275 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13276 struct bfd_link_info
*info
, bfd
*abfd
,
13279 if (sec
->reloc_count
== 0)
13281 cookie
->rels
= NULL
;
13282 cookie
->relend
= NULL
;
13286 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13287 info
->keep_memory
);
13288 if (cookie
->rels
== NULL
)
13290 cookie
->rel
= cookie
->rels
;
13291 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13293 cookie
->rel
= cookie
->rels
;
13297 /* Free the memory allocated by init_reloc_cookie_rels,
13301 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13304 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13305 free (cookie
->rels
);
13308 /* Initialize the whole of COOKIE for input section SEC. */
13311 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13312 struct bfd_link_info
*info
,
13315 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13317 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13322 fini_reloc_cookie (cookie
, sec
->owner
);
13327 /* Free the memory allocated by init_reloc_cookie_for_section,
13331 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13334 fini_reloc_cookie_rels (cookie
, sec
);
13335 fini_reloc_cookie (cookie
, sec
->owner
);
13338 /* Garbage collect unused sections. */
13340 /* Default gc_mark_hook. */
13343 _bfd_elf_gc_mark_hook (asection
*sec
,
13344 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13345 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13346 struct elf_link_hash_entry
*h
,
13347 Elf_Internal_Sym
*sym
)
13351 switch (h
->root
.type
)
13353 case bfd_link_hash_defined
:
13354 case bfd_link_hash_defweak
:
13355 return h
->root
.u
.def
.section
;
13357 case bfd_link_hash_common
:
13358 return h
->root
.u
.c
.p
->section
;
13365 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13370 /* Return the debug definition section. */
13373 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13374 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13375 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13376 struct elf_link_hash_entry
*h
,
13377 Elf_Internal_Sym
*sym
)
13381 /* Return the global debug definition section. */
13382 if ((h
->root
.type
== bfd_link_hash_defined
13383 || h
->root
.type
== bfd_link_hash_defweak
)
13384 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13385 return h
->root
.u
.def
.section
;
13389 /* Return the local debug definition section. */
13390 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13392 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13399 /* COOKIE->rel describes a relocation against section SEC, which is
13400 a section we've decided to keep. Return the section that contains
13401 the relocation symbol, or NULL if no section contains it. */
13404 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13405 elf_gc_mark_hook_fn gc_mark_hook
,
13406 struct elf_reloc_cookie
*cookie
,
13407 bfd_boolean
*start_stop
)
13409 unsigned long r_symndx
;
13410 struct elf_link_hash_entry
*h
, *hw
;
13412 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13413 if (r_symndx
== STN_UNDEF
)
13416 if (r_symndx
>= cookie
->locsymcount
13417 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13419 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13422 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13426 while (h
->root
.type
== bfd_link_hash_indirect
13427 || h
->root
.type
== bfd_link_hash_warning
)
13428 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13430 /* Keep all aliases of the symbol too. If an object symbol
13431 needs to be copied into .dynbss then all of its aliases
13432 should be present as dynamic symbols, not just the one used
13433 on the copy relocation. */
13435 while (hw
->is_weakalias
)
13441 if (start_stop
!= NULL
)
13443 /* To work around a glibc bug, mark XXX input sections
13444 when there is a reference to __start_XXX or __stop_XXX
13448 asection
*s
= h
->u2
.start_stop_section
;
13449 *start_stop
= !s
->gc_mark
;
13454 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13457 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13458 &cookie
->locsyms
[r_symndx
]);
13461 /* COOKIE->rel describes a relocation against section SEC, which is
13462 a section we've decided to keep. Mark the section that contains
13463 the relocation symbol. */
13466 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13468 elf_gc_mark_hook_fn gc_mark_hook
,
13469 struct elf_reloc_cookie
*cookie
)
13472 bfd_boolean start_stop
= FALSE
;
13474 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13475 while (rsec
!= NULL
)
13477 if (!rsec
->gc_mark
)
13479 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13480 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13482 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13487 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13492 /* The mark phase of garbage collection. For a given section, mark
13493 it and any sections in this section's group, and all the sections
13494 which define symbols to which it refers. */
13497 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13499 elf_gc_mark_hook_fn gc_mark_hook
)
13502 asection
*group_sec
, *eh_frame
;
13506 /* Mark all the sections in the group. */
13507 group_sec
= elf_section_data (sec
)->next_in_group
;
13508 if (group_sec
&& !group_sec
->gc_mark
)
13509 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13512 /* Look through the section relocs. */
13514 eh_frame
= elf_eh_frame_section (sec
->owner
);
13515 if ((sec
->flags
& SEC_RELOC
) != 0
13516 && sec
->reloc_count
> 0
13517 && sec
!= eh_frame
)
13519 struct elf_reloc_cookie cookie
;
13521 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13525 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13526 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13531 fini_reloc_cookie_for_section (&cookie
, sec
);
13535 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13537 struct elf_reloc_cookie cookie
;
13539 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13543 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13544 gc_mark_hook
, &cookie
))
13546 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13550 eh_frame
= elf_section_eh_frame_entry (sec
);
13551 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13552 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13558 /* Scan and mark sections in a special or debug section group. */
13561 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13563 /* Point to first section of section group. */
13565 /* Used to iterate the section group. */
13568 bfd_boolean is_special_grp
= TRUE
;
13569 bfd_boolean is_debug_grp
= TRUE
;
13571 /* First scan to see if group contains any section other than debug
13572 and special section. */
13573 ssec
= msec
= elf_next_in_group (grp
);
13576 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13577 is_debug_grp
= FALSE
;
13579 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13580 is_special_grp
= FALSE
;
13582 msec
= elf_next_in_group (msec
);
13584 while (msec
!= ssec
);
13586 /* If this is a pure debug section group or pure special section group,
13587 keep all sections in this group. */
13588 if (is_debug_grp
|| is_special_grp
)
13593 msec
= elf_next_in_group (msec
);
13595 while (msec
!= ssec
);
13599 /* Keep debug and special sections. */
13602 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13603 elf_gc_mark_hook_fn mark_hook
)
13607 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13610 bfd_boolean some_kept
;
13611 bfd_boolean debug_frag_seen
;
13612 bfd_boolean has_kept_debug_info
;
13614 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13616 isec
= ibfd
->sections
;
13617 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13620 /* Ensure all linker created sections are kept,
13621 see if any other section is already marked,
13622 and note if we have any fragmented debug sections. */
13623 debug_frag_seen
= some_kept
= has_kept_debug_info
= FALSE
;
13624 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13626 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13628 else if (isec
->gc_mark
13629 && (isec
->flags
& SEC_ALLOC
) != 0
13630 && elf_section_type (isec
) != SHT_NOTE
)
13634 /* Since all sections, except for backend specific ones,
13635 have been garbage collected, call mark_hook on this
13636 section if any of its linked-to sections is marked. */
13637 asection
*linked_to_sec
;
13638 for (linked_to_sec
= elf_linked_to_section (isec
);
13639 linked_to_sec
!= NULL
&& !linked_to_sec
->linker_mark
;
13640 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13642 if (linked_to_sec
->gc_mark
)
13644 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13648 linked_to_sec
->linker_mark
= 1;
13650 for (linked_to_sec
= elf_linked_to_section (isec
);
13651 linked_to_sec
!= NULL
&& linked_to_sec
->linker_mark
;
13652 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13653 linked_to_sec
->linker_mark
= 0;
13656 if (!debug_frag_seen
13657 && (isec
->flags
& SEC_DEBUGGING
)
13658 && CONST_STRNEQ (isec
->name
, ".debug_line."))
13659 debug_frag_seen
= TRUE
;
13660 else if (strcmp (bfd_section_name (isec
),
13661 "__patchable_function_entries") == 0
13662 && elf_linked_to_section (isec
) == NULL
)
13663 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13664 "need linked-to section "
13665 "for --gc-sections\n"),
13666 isec
->owner
, isec
);
13669 /* If no non-note alloc section in this file will be kept, then
13670 we can toss out the debug and special sections. */
13674 /* Keep debug and special sections like .comment when they are
13675 not part of a group. Also keep section groups that contain
13676 just debug sections or special sections. NB: Sections with
13677 linked-to section has been handled above. */
13678 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13680 if ((isec
->flags
& SEC_GROUP
) != 0)
13681 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13682 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13683 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13684 && elf_next_in_group (isec
) == NULL
13685 && elf_linked_to_section (isec
) == NULL
)
13687 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13688 has_kept_debug_info
= TRUE
;
13691 /* Look for CODE sections which are going to be discarded,
13692 and find and discard any fragmented debug sections which
13693 are associated with that code section. */
13694 if (debug_frag_seen
)
13695 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13696 if ((isec
->flags
& SEC_CODE
) != 0
13697 && isec
->gc_mark
== 0)
13702 ilen
= strlen (isec
->name
);
13704 /* Association is determined by the name of the debug
13705 section containing the name of the code section as
13706 a suffix. For example .debug_line.text.foo is a
13707 debug section associated with .text.foo. */
13708 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13712 if (dsec
->gc_mark
== 0
13713 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13716 dlen
= strlen (dsec
->name
);
13719 && strncmp (dsec
->name
+ (dlen
- ilen
),
13720 isec
->name
, ilen
) == 0)
13725 /* Mark debug sections referenced by kept debug sections. */
13726 if (has_kept_debug_info
)
13727 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13729 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13730 if (!_bfd_elf_gc_mark (info
, isec
,
13731 elf_gc_mark_debug_section
))
13738 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13741 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13743 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13747 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13748 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13749 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13752 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13755 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13757 /* When any section in a section group is kept, we keep all
13758 sections in the section group. If the first member of
13759 the section group is excluded, we will also exclude the
13761 if (o
->flags
& SEC_GROUP
)
13763 asection
*first
= elf_next_in_group (o
);
13764 o
->gc_mark
= first
->gc_mark
;
13770 /* Skip sweeping sections already excluded. */
13771 if (o
->flags
& SEC_EXCLUDE
)
13774 /* Since this is early in the link process, it is simple
13775 to remove a section from the output. */
13776 o
->flags
|= SEC_EXCLUDE
;
13778 if (info
->print_gc_sections
&& o
->size
!= 0)
13779 /* xgettext:c-format */
13780 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13788 /* Propagate collected vtable information. This is called through
13789 elf_link_hash_traverse. */
13792 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13794 /* Those that are not vtables. */
13796 || h
->u2
.vtable
== NULL
13797 || h
->u2
.vtable
->parent
== NULL
)
13800 /* Those vtables that do not have parents, we cannot merge. */
13801 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13804 /* If we've already been done, exit. */
13805 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13808 /* Make sure the parent's table is up to date. */
13809 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13811 if (h
->u2
.vtable
->used
== NULL
)
13813 /* None of this table's entries were referenced. Re-use the
13815 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13816 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13821 bfd_boolean
*cu
, *pu
;
13823 /* Or the parent's entries into ours. */
13824 cu
= h
->u2
.vtable
->used
;
13826 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13829 const struct elf_backend_data
*bed
;
13830 unsigned int log_file_align
;
13832 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13833 log_file_align
= bed
->s
->log_file_align
;
13834 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13849 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13852 bfd_vma hstart
, hend
;
13853 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13854 const struct elf_backend_data
*bed
;
13855 unsigned int log_file_align
;
13857 /* Take care of both those symbols that do not describe vtables as
13858 well as those that are not loaded. */
13860 || h
->u2
.vtable
== NULL
13861 || h
->u2
.vtable
->parent
== NULL
)
13864 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13865 || h
->root
.type
== bfd_link_hash_defweak
);
13867 sec
= h
->root
.u
.def
.section
;
13868 hstart
= h
->root
.u
.def
.value
;
13869 hend
= hstart
+ h
->size
;
13871 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
13873 return *(bfd_boolean
*) okp
= FALSE
;
13874 bed
= get_elf_backend_data (sec
->owner
);
13875 log_file_align
= bed
->s
->log_file_align
;
13877 relend
= relstart
+ sec
->reloc_count
;
13879 for (rel
= relstart
; rel
< relend
; ++rel
)
13880 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13882 /* If the entry is in use, do nothing. */
13883 if (h
->u2
.vtable
->used
13884 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13886 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13887 if (h
->u2
.vtable
->used
[entry
])
13890 /* Otherwise, kill it. */
13891 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13897 /* Mark sections containing dynamically referenced symbols. When
13898 building shared libraries, we must assume that any visible symbol is
13902 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13904 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13905 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13907 if ((h
->root
.type
== bfd_link_hash_defined
13908 || h
->root
.type
== bfd_link_hash_defweak
)
13909 && ((h
->ref_dynamic
&& !h
->forced_local
)
13910 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13911 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13912 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13913 && (!bfd_link_executable (info
)
13914 || info
->gc_keep_exported
13915 || info
->export_dynamic
13918 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13919 && (h
->versioned
>= versioned
13920 || !bfd_hide_sym_by_version (info
->version_info
,
13921 h
->root
.root
.string
)))))
13922 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13927 /* Keep all sections containing symbols undefined on the command-line,
13928 and the section containing the entry symbol. */
13931 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13933 struct bfd_sym_chain
*sym
;
13935 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13937 struct elf_link_hash_entry
*h
;
13939 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13940 FALSE
, FALSE
, FALSE
);
13943 && (h
->root
.type
== bfd_link_hash_defined
13944 || h
->root
.type
== bfd_link_hash_defweak
)
13945 && !bfd_is_const_section (h
->root
.u
.def
.section
))
13946 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13951 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13952 struct bfd_link_info
*info
)
13954 bfd
*ibfd
= info
->input_bfds
;
13956 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13959 struct elf_reloc_cookie cookie
;
13961 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13963 sec
= ibfd
->sections
;
13964 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13967 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
13970 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
13972 if (CONST_STRNEQ (bfd_section_name (sec
), ".eh_frame_entry")
13973 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
13975 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
13976 fini_reloc_cookie_rels (&cookie
, sec
);
13983 /* Do mark and sweep of unused sections. */
13986 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
13988 bfd_boolean ok
= TRUE
;
13990 elf_gc_mark_hook_fn gc_mark_hook
;
13991 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13992 struct elf_link_hash_table
*htab
;
13994 if (!bed
->can_gc_sections
13995 || !is_elf_hash_table (info
->hash
))
13997 _bfd_error_handler(_("warning: gc-sections option ignored"));
14001 bed
->gc_keep (info
);
14002 htab
= elf_hash_table (info
);
14004 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
14005 at the .eh_frame section if we can mark the FDEs individually. */
14006 for (sub
= info
->input_bfds
;
14007 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
14008 sub
= sub
->link
.next
)
14011 struct elf_reloc_cookie cookie
;
14013 sec
= sub
->sections
;
14014 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14016 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
14017 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
14019 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
14020 if (elf_section_data (sec
)->sec_info
14021 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
14022 elf_eh_frame_section (sub
) = sec
;
14023 fini_reloc_cookie_for_section (&cookie
, sec
);
14024 sec
= bfd_get_next_section_by_name (NULL
, sec
);
14028 /* Apply transitive closure to the vtable entry usage info. */
14029 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
14033 /* Kill the vtable relocations that were not used. */
14034 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
14038 /* Mark dynamically referenced symbols. */
14039 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
14040 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
14042 /* Grovel through relocs to find out who stays ... */
14043 gc_mark_hook
= bed
->gc_mark_hook
;
14044 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14048 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14049 || elf_object_id (sub
) != elf_hash_table_id (htab
)
14050 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14054 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14057 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
14058 Also treat note sections as a root, if the section is not part
14059 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
14060 well as FINI_ARRAY sections for ld -r. */
14061 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14063 && (o
->flags
& SEC_EXCLUDE
) == 0
14064 && ((o
->flags
& SEC_KEEP
) != 0
14065 || (bfd_link_relocatable (info
)
14066 && ((elf_section_data (o
)->this_hdr
.sh_type
14067 == SHT_PREINIT_ARRAY
)
14068 || (elf_section_data (o
)->this_hdr
.sh_type
14070 || (elf_section_data (o
)->this_hdr
.sh_type
14071 == SHT_FINI_ARRAY
)))
14072 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
14073 && elf_next_in_group (o
) == NULL
14074 && elf_linked_to_section (o
) == NULL
)
14075 || ((elf_tdata (sub
)->has_gnu_osabi
& elf_gnu_osabi_retain
)
14076 && (elf_section_flags (o
) & SHF_GNU_RETAIN
))))
14078 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
14083 /* Allow the backend to mark additional target specific sections. */
14084 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
14086 /* ... and mark SEC_EXCLUDE for those that go. */
14087 return elf_gc_sweep (abfd
, info
);
14090 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
14093 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
14095 struct elf_link_hash_entry
*h
,
14098 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
14099 struct elf_link_hash_entry
**search
, *child
;
14100 size_t extsymcount
;
14101 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14103 /* The sh_info field of the symtab header tells us where the
14104 external symbols start. We don't care about the local symbols at
14106 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
14107 if (!elf_bad_symtab (abfd
))
14108 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
14110 sym_hashes
= elf_sym_hashes (abfd
);
14111 sym_hashes_end
= sym_hashes
+ extsymcount
;
14113 /* Hunt down the child symbol, which is in this section at the same
14114 offset as the relocation. */
14115 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
14117 if ((child
= *search
) != NULL
14118 && (child
->root
.type
== bfd_link_hash_defined
14119 || child
->root
.type
== bfd_link_hash_defweak
)
14120 && child
->root
.u
.def
.section
== sec
14121 && child
->root
.u
.def
.value
== offset
)
14125 /* xgettext:c-format */
14126 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
14127 abfd
, sec
, (uint64_t) offset
);
14128 bfd_set_error (bfd_error_invalid_operation
);
14132 if (!child
->u2
.vtable
)
14134 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14135 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
14136 if (!child
->u2
.vtable
)
14141 /* This *should* only be the absolute section. It could potentially
14142 be that someone has defined a non-global vtable though, which
14143 would be bad. It isn't worth paging in the local symbols to be
14144 sure though; that case should simply be handled by the assembler. */
14146 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
14149 child
->u2
.vtable
->parent
= h
;
14154 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
14157 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
14158 struct elf_link_hash_entry
*h
,
14161 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14162 unsigned int log_file_align
= bed
->s
->log_file_align
;
14166 /* xgettext:c-format */
14167 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
14169 bfd_set_error (bfd_error_bad_value
);
14175 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14176 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14181 if (addend
>= h
->u2
.vtable
->size
)
14183 size_t size
, bytes
, file_align
;
14184 bfd_boolean
*ptr
= h
->u2
.vtable
->used
;
14186 /* While the symbol is undefined, we have to be prepared to handle
14188 file_align
= 1 << log_file_align
;
14189 if (h
->root
.type
== bfd_link_hash_undefined
)
14190 size
= addend
+ file_align
;
14194 if (addend
>= size
)
14196 /* Oops! We've got a reference past the defined end of
14197 the table. This is probably a bug -- shall we warn? */
14198 size
= addend
+ file_align
;
14201 size
= (size
+ file_align
- 1) & -file_align
;
14203 /* Allocate one extra entry for use as a "done" flag for the
14204 consolidation pass. */
14205 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
14209 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
14215 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14216 * sizeof (bfd_boolean
));
14217 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14221 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
14226 /* And arrange for that done flag to be at index -1. */
14227 h
->u2
.vtable
->used
= ptr
+ 1;
14228 h
->u2
.vtable
->size
= size
;
14231 h
->u2
.vtable
->used
[addend
>> log_file_align
] = TRUE
;
14236 /* Map an ELF section header flag to its corresponding string. */
14240 flagword flag_value
;
14241 } elf_flags_to_name_table
;
14243 static const elf_flags_to_name_table elf_flags_to_names
[] =
14245 { "SHF_WRITE", SHF_WRITE
},
14246 { "SHF_ALLOC", SHF_ALLOC
},
14247 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14248 { "SHF_MERGE", SHF_MERGE
},
14249 { "SHF_STRINGS", SHF_STRINGS
},
14250 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14251 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14252 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14253 { "SHF_GROUP", SHF_GROUP
},
14254 { "SHF_TLS", SHF_TLS
},
14255 { "SHF_MASKOS", SHF_MASKOS
},
14256 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14259 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14261 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14262 struct flag_info
*flaginfo
,
14265 const bfd_vma sh_flags
= elf_section_flags (section
);
14267 if (!flaginfo
->flags_initialized
)
14269 bfd
*obfd
= info
->output_bfd
;
14270 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14271 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14273 int without_hex
= 0;
14275 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14278 flagword (*lookup
) (char *);
14280 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14281 if (lookup
!= NULL
)
14283 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14287 if (tf
->with
== with_flags
)
14288 with_hex
|= hexval
;
14289 else if (tf
->with
== without_flags
)
14290 without_hex
|= hexval
;
14295 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14297 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14299 if (tf
->with
== with_flags
)
14300 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14301 else if (tf
->with
== without_flags
)
14302 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14309 info
->callbacks
->einfo
14310 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14314 flaginfo
->flags_initialized
= TRUE
;
14315 flaginfo
->only_with_flags
|= with_hex
;
14316 flaginfo
->not_with_flags
|= without_hex
;
14319 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14322 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14328 struct alloc_got_off_arg
{
14330 struct bfd_link_info
*info
;
14333 /* We need a special top-level link routine to convert got reference counts
14334 to real got offsets. */
14337 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14339 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14340 bfd
*obfd
= gofarg
->info
->output_bfd
;
14341 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14343 if (h
->got
.refcount
> 0)
14345 h
->got
.offset
= gofarg
->gotoff
;
14346 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14349 h
->got
.offset
= (bfd_vma
) -1;
14354 /* And an accompanying bit to work out final got entry offsets once
14355 we're done. Should be called from final_link. */
14358 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14359 struct bfd_link_info
*info
)
14362 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14364 struct alloc_got_off_arg gofarg
;
14366 BFD_ASSERT (abfd
== info
->output_bfd
);
14368 if (! is_elf_hash_table (info
->hash
))
14371 /* The GOT offset is relative to the .got section, but the GOT header is
14372 put into the .got.plt section, if the backend uses it. */
14373 if (bed
->want_got_plt
)
14376 gotoff
= bed
->got_header_size
;
14378 /* Do the local .got entries first. */
14379 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14381 bfd_signed_vma
*local_got
;
14382 size_t j
, locsymcount
;
14383 Elf_Internal_Shdr
*symtab_hdr
;
14385 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14388 local_got
= elf_local_got_refcounts (i
);
14392 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14393 if (elf_bad_symtab (i
))
14394 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14396 locsymcount
= symtab_hdr
->sh_info
;
14398 for (j
= 0; j
< locsymcount
; ++j
)
14400 if (local_got
[j
] > 0)
14402 local_got
[j
] = gotoff
;
14403 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14406 local_got
[j
] = (bfd_vma
) -1;
14410 /* Then the global .got entries. .plt refcounts are handled by
14411 adjust_dynamic_symbol */
14412 gofarg
.gotoff
= gotoff
;
14413 gofarg
.info
= info
;
14414 elf_link_hash_traverse (elf_hash_table (info
),
14415 elf_gc_allocate_got_offsets
,
14420 /* Many folk need no more in the way of final link than this, once
14421 got entry reference counting is enabled. */
14424 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14426 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14429 /* Invoke the regular ELF backend linker to do all the work. */
14430 return bfd_elf_final_link (abfd
, info
);
14434 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14436 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14438 if (rcookie
->bad_symtab
)
14439 rcookie
->rel
= rcookie
->rels
;
14441 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14443 unsigned long r_symndx
;
14445 if (! rcookie
->bad_symtab
)
14446 if (rcookie
->rel
->r_offset
> offset
)
14448 if (rcookie
->rel
->r_offset
!= offset
)
14451 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14452 if (r_symndx
== STN_UNDEF
)
14455 if (r_symndx
>= rcookie
->locsymcount
14456 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14458 struct elf_link_hash_entry
*h
;
14460 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14462 while (h
->root
.type
== bfd_link_hash_indirect
14463 || h
->root
.type
== bfd_link_hash_warning
)
14464 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14466 if ((h
->root
.type
== bfd_link_hash_defined
14467 || h
->root
.type
== bfd_link_hash_defweak
)
14468 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14469 || h
->root
.u
.def
.section
->kept_section
!= NULL
14470 || discarded_section (h
->root
.u
.def
.section
)))
14475 /* It's not a relocation against a global symbol,
14476 but it could be a relocation against a local
14477 symbol for a discarded section. */
14479 Elf_Internal_Sym
*isym
;
14481 /* Need to: get the symbol; get the section. */
14482 isym
= &rcookie
->locsyms
[r_symndx
];
14483 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14485 && (isec
->kept_section
!= NULL
14486 || discarded_section (isec
)))
14494 /* Discard unneeded references to discarded sections.
14495 Returns -1 on error, 1 if any section's size was changed, 0 if
14496 nothing changed. This function assumes that the relocations are in
14497 sorted order, which is true for all known assemblers. */
14500 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14502 struct elf_reloc_cookie cookie
;
14507 if (info
->traditional_format
14508 || !is_elf_hash_table (info
->hash
))
14511 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14516 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14519 || i
->reloc_count
== 0
14520 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14524 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14527 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14530 if (_bfd_discard_section_stabs (abfd
, i
,
14531 elf_section_data (i
)->sec_info
,
14532 bfd_elf_reloc_symbol_deleted_p
,
14536 fini_reloc_cookie_for_section (&cookie
, i
);
14541 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14542 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14546 int eh_changed
= 0;
14547 unsigned int eh_alignment
; /* Octets. */
14549 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14555 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14558 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14561 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14562 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14563 bfd_elf_reloc_symbol_deleted_p
,
14567 if (i
->size
!= i
->rawsize
)
14571 fini_reloc_cookie_for_section (&cookie
, i
);
14574 eh_alignment
= ((1 << o
->alignment_power
)
14575 * bfd_octets_per_byte (output_bfd
, o
));
14576 /* Skip over zero terminator, and prevent empty sections from
14577 adding alignment padding at the end. */
14578 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14580 i
->flags
|= SEC_EXCLUDE
;
14581 else if (i
->size
> 4)
14583 /* The last non-empty eh_frame section doesn't need padding. */
14586 /* Any prior sections must pad the last FDE out to the output
14587 section alignment. Otherwise we might have zero padding
14588 between sections, which would be seen as a terminator. */
14589 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14591 /* All but the last zero terminator should have been removed. */
14596 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14597 if (i
->size
!= size
)
14605 elf_link_hash_traverse (elf_hash_table (info
),
14606 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14609 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14611 const struct elf_backend_data
*bed
;
14614 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14616 s
= abfd
->sections
;
14617 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14620 bed
= get_elf_backend_data (abfd
);
14622 if (bed
->elf_backend_discard_info
!= NULL
)
14624 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14627 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14630 fini_reloc_cookie (&cookie
, abfd
);
14634 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14635 _bfd_elf_end_eh_frame_parsing (info
);
14637 if (info
->eh_frame_hdr_type
14638 && !bfd_link_relocatable (info
)
14639 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14646 _bfd_elf_section_already_linked (bfd
*abfd
,
14648 struct bfd_link_info
*info
)
14651 const char *name
, *key
;
14652 struct bfd_section_already_linked
*l
;
14653 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14655 if (sec
->output_section
== bfd_abs_section_ptr
)
14658 flags
= sec
->flags
;
14660 /* Return if it isn't a linkonce section. A comdat group section
14661 also has SEC_LINK_ONCE set. */
14662 if ((flags
& SEC_LINK_ONCE
) == 0)
14665 /* Don't put group member sections on our list of already linked
14666 sections. They are handled as a group via their group section. */
14667 if (elf_sec_group (sec
) != NULL
)
14670 /* For a SHT_GROUP section, use the group signature as the key. */
14672 if ((flags
& SEC_GROUP
) != 0
14673 && elf_next_in_group (sec
) != NULL
14674 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14675 key
= elf_group_name (elf_next_in_group (sec
));
14678 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14679 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
14680 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14683 /* Must be a user linkonce section that doesn't follow gcc's
14684 naming convention. In this case we won't be matching
14685 single member groups. */
14689 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14691 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14693 /* We may have 2 different types of sections on the list: group
14694 sections with a signature of <key> (<key> is some string),
14695 and linkonce sections named .gnu.linkonce.<type>.<key>.
14696 Match like sections. LTO plugin sections are an exception.
14697 They are always named .gnu.linkonce.t.<key> and match either
14698 type of section. */
14699 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14700 && ((flags
& SEC_GROUP
) != 0
14701 || strcmp (name
, l
->sec
->name
) == 0))
14702 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0
14703 || (sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14705 /* The section has already been linked. See if we should
14706 issue a warning. */
14707 if (!_bfd_handle_already_linked (sec
, l
, info
))
14710 if (flags
& SEC_GROUP
)
14712 asection
*first
= elf_next_in_group (sec
);
14713 asection
*s
= first
;
14717 s
->output_section
= bfd_abs_section_ptr
;
14718 /* Record which group discards it. */
14719 s
->kept_section
= l
->sec
;
14720 s
= elf_next_in_group (s
);
14721 /* These lists are circular. */
14731 /* A single member comdat group section may be discarded by a
14732 linkonce section and vice versa. */
14733 if ((flags
& SEC_GROUP
) != 0)
14735 asection
*first
= elf_next_in_group (sec
);
14737 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14738 /* Check this single member group against linkonce sections. */
14739 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14740 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14741 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14743 first
->output_section
= bfd_abs_section_ptr
;
14744 first
->kept_section
= l
->sec
;
14745 sec
->output_section
= bfd_abs_section_ptr
;
14750 /* Check this linkonce section against single member groups. */
14751 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14752 if (l
->sec
->flags
& SEC_GROUP
)
14754 asection
*first
= elf_next_in_group (l
->sec
);
14757 && elf_next_in_group (first
) == first
14758 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14760 sec
->output_section
= bfd_abs_section_ptr
;
14761 sec
->kept_section
= first
;
14766 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14767 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14768 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14769 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14770 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14771 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14772 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14773 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14774 The reverse order cannot happen as there is never a bfd with only the
14775 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14776 matter as here were are looking only for cross-bfd sections. */
14778 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
14779 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14780 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14781 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
14783 if (abfd
!= l
->sec
->owner
)
14784 sec
->output_section
= bfd_abs_section_ptr
;
14788 /* This is the first section with this name. Record it. */
14789 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14790 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14791 return sec
->output_section
== bfd_abs_section_ptr
;
14795 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14797 return sym
->st_shndx
== SHN_COMMON
;
14801 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14807 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14809 return bfd_com_section_ptr
;
14813 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14814 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14815 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14816 bfd
*ibfd ATTRIBUTE_UNUSED
,
14817 unsigned long symndx ATTRIBUTE_UNUSED
)
14819 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14820 return bed
->s
->arch_size
/ 8;
14823 /* Routines to support the creation of dynamic relocs. */
14825 /* Returns the name of the dynamic reloc section associated with SEC. */
14827 static const char *
14828 get_dynamic_reloc_section_name (bfd
* abfd
,
14830 bfd_boolean is_rela
)
14833 const char *old_name
= bfd_section_name (sec
);
14834 const char *prefix
= is_rela
? ".rela" : ".rel";
14836 if (old_name
== NULL
)
14839 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14840 sprintf (name
, "%s%s", prefix
, old_name
);
14845 /* Returns the dynamic reloc section associated with SEC.
14846 If necessary compute the name of the dynamic reloc section based
14847 on SEC's name (looked up in ABFD's string table) and the setting
14851 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
14853 bfd_boolean is_rela
)
14855 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14857 if (reloc_sec
== NULL
)
14859 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14863 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14865 if (reloc_sec
!= NULL
)
14866 elf_section_data (sec
)->sreloc
= reloc_sec
;
14873 /* Returns the dynamic reloc section associated with SEC. If the
14874 section does not exist it is created and attached to the DYNOBJ
14875 bfd and stored in the SRELOC field of SEC's elf_section_data
14878 ALIGNMENT is the alignment for the newly created section and
14879 IS_RELA defines whether the name should be .rela.<SEC's name>
14880 or .rel.<SEC's name>. The section name is looked up in the
14881 string table associated with ABFD. */
14884 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14886 unsigned int alignment
,
14888 bfd_boolean is_rela
)
14890 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14892 if (reloc_sec
== NULL
)
14894 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14899 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14901 if (reloc_sec
== NULL
)
14903 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14904 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14905 if ((sec
->flags
& SEC_ALLOC
) != 0)
14906 flags
|= SEC_ALLOC
| SEC_LOAD
;
14908 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14909 if (reloc_sec
!= NULL
)
14911 /* _bfd_elf_get_sec_type_attr chooses a section type by
14912 name. Override as it may be wrong, eg. for a user
14913 section named "auto" we'll get ".relauto" which is
14914 seen to be a .rela section. */
14915 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14916 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14921 elf_section_data (sec
)->sreloc
= reloc_sec
;
14927 /* Copy the ELF symbol type and other attributes for a linker script
14928 assignment from HSRC to HDEST. Generally this should be treated as
14929 if we found a strong non-dynamic definition for HDEST (except that
14930 ld ignores multiple definition errors). */
14932 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14933 struct bfd_link_hash_entry
*hdest
,
14934 struct bfd_link_hash_entry
*hsrc
)
14936 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14937 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14938 Elf_Internal_Sym isym
;
14940 ehdest
->type
= ehsrc
->type
;
14941 ehdest
->target_internal
= ehsrc
->target_internal
;
14943 isym
.st_other
= ehsrc
->other
;
14944 elf_merge_st_other (abfd
, ehdest
, isym
.st_other
, NULL
, TRUE
, FALSE
);
14947 /* Append a RELA relocation REL to section S in BFD. */
14950 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14952 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14953 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14954 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14955 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14958 /* Append a REL relocation REL to section S in BFD. */
14961 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14963 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14964 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14965 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
14966 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
14969 /* Define __start, __stop, .startof. or .sizeof. symbol. */
14971 struct bfd_link_hash_entry
*
14972 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
14973 const char *symbol
, asection
*sec
)
14975 struct elf_link_hash_entry
*h
;
14977 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
14978 FALSE
, FALSE
, TRUE
);
14979 /* NB: Common symbols will be turned into definition later. */
14981 && (h
->root
.type
== bfd_link_hash_undefined
14982 || h
->root
.type
== bfd_link_hash_undefweak
14983 || ((h
->ref_regular
|| h
->def_dynamic
)
14985 && h
->root
.type
!= bfd_link_hash_common
)))
14987 bfd_boolean was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
14988 h
->verinfo
.verdef
= NULL
;
14989 h
->root
.type
= bfd_link_hash_defined
;
14990 h
->root
.u
.def
.section
= sec
;
14991 h
->root
.u
.def
.value
= 0;
14992 h
->def_regular
= 1;
14993 h
->def_dynamic
= 0;
14995 h
->u2
.start_stop_section
= sec
;
14996 if (symbol
[0] == '.')
14998 /* .startof. and .sizeof. symbols are local. */
14999 const struct elf_backend_data
*bed
;
15000 bed
= get_elf_backend_data (info
->output_bfd
);
15001 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
15005 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
15006 h
->other
= ((h
->other
& ~ELF_ST_VISIBILITY (-1))
15007 | info
->start_stop_visibility
);
15009 bfd_elf_link_record_dynamic_symbol (info
, h
);
15016 /* Find dynamic relocs for H that apply to read-only sections. */
15019 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
15021 struct elf_dyn_relocs
*p
;
15023 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
15025 asection
*s
= p
->sec
->output_section
;
15027 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
15033 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
15034 read-only sections. */
15037 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
15041 if (h
->root
.type
== bfd_link_hash_indirect
)
15044 sec
= _bfd_elf_readonly_dynrelocs (h
);
15047 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
15049 info
->flags
|= DF_TEXTREL
;
15050 /* xgettext:c-format */
15051 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
15052 "in read-only section `%pA'\n"),
15053 sec
->owner
, h
->root
.root
.string
, sec
);
15055 if (bfd_link_textrel_check (info
))
15056 /* xgettext:c-format */
15057 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
15058 "in read-only section `%pA'\n"),
15059 sec
->owner
, h
->root
.root
.string
, sec
);
15061 /* Not an error, just cut short the traversal. */
15067 /* Add dynamic tags. */
15070 _bfd_elf_add_dynamic_tags (bfd
*output_bfd
, struct bfd_link_info
*info
,
15071 bfd_boolean need_dynamic_reloc
)
15073 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
15075 if (htab
->dynamic_sections_created
)
15077 /* Add some entries to the .dynamic section. We fill in the
15078 values later, in finish_dynamic_sections, but we must add
15079 the entries now so that we get the correct size for the
15080 .dynamic section. The DT_DEBUG entry is filled in by the
15081 dynamic linker and used by the debugger. */
15082 #define add_dynamic_entry(TAG, VAL) \
15083 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
15085 const struct elf_backend_data
*bed
15086 = get_elf_backend_data (output_bfd
);
15088 if (bfd_link_executable (info
))
15090 if (!add_dynamic_entry (DT_DEBUG
, 0))
15094 if (htab
->dt_pltgot_required
|| htab
->splt
->size
!= 0)
15096 /* DT_PLTGOT is used by prelink even if there is no PLT
15098 if (!add_dynamic_entry (DT_PLTGOT
, 0))
15102 if (htab
->dt_jmprel_required
|| htab
->srelplt
->size
!= 0)
15104 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
15105 || !add_dynamic_entry (DT_PLTREL
,
15106 (bed
->rela_plts_and_copies_p
15107 ? DT_RELA
: DT_REL
))
15108 || !add_dynamic_entry (DT_JMPREL
, 0))
15112 if (htab
->tlsdesc_plt
15113 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
15114 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
15117 if (need_dynamic_reloc
)
15119 if (bed
->rela_plts_and_copies_p
)
15121 if (!add_dynamic_entry (DT_RELA
, 0)
15122 || !add_dynamic_entry (DT_RELASZ
, 0)
15123 || !add_dynamic_entry (DT_RELAENT
,
15124 bed
->s
->sizeof_rela
))
15129 if (!add_dynamic_entry (DT_REL
, 0)
15130 || !add_dynamic_entry (DT_RELSZ
, 0)
15131 || !add_dynamic_entry (DT_RELENT
,
15132 bed
->s
->sizeof_rel
))
15136 /* If any dynamic relocs apply to a read-only section,
15137 then we need a DT_TEXTREL entry. */
15138 if ((info
->flags
& DF_TEXTREL
) == 0)
15139 elf_link_hash_traverse (htab
, _bfd_elf_maybe_set_textrel
,
15142 if ((info
->flags
& DF_TEXTREL
) != 0)
15144 if (htab
->ifunc_resolvers
)
15145 info
->callbacks
->einfo
15146 (_("%P: warning: GNU indirect functions with DT_TEXTREL "
15147 "may result in a segfault at runtime; recompile with %s\n"),
15148 bfd_link_dll (info
) ? "-fPIC" : "-fPIE");
15150 if (!add_dynamic_entry (DT_TEXTREL
, 0))
15155 #undef add_dynamic_entry