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"
40 /* This struct is used to pass information to routines called via
41 elf_link_hash_traverse which must return failure. */
43 struct elf_info_failed
45 struct bfd_link_info
*info
;
49 /* This structure is used to pass information to
50 _bfd_elf_link_find_version_dependencies. */
52 struct elf_find_verdep_info
54 /* General link information. */
55 struct bfd_link_info
*info
;
56 /* The number of dependencies. */
58 /* Whether we had a failure. */
62 static bool _bfd_elf_fix_symbol_flags
63 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
66 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
67 unsigned long r_symndx
,
70 if (r_symndx
>= cookie
->locsymcount
71 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
73 struct elf_link_hash_entry
*h
;
75 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
77 while (h
->root
.type
== bfd_link_hash_indirect
78 || h
->root
.type
== bfd_link_hash_warning
)
79 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
81 if ((h
->root
.type
== bfd_link_hash_defined
82 || h
->root
.type
== bfd_link_hash_defweak
)
83 && discarded_section (h
->root
.u
.def
.section
))
84 return h
->root
.u
.def
.section
;
90 /* It's not a relocation against a global symbol,
91 but it could be a relocation against a local
92 symbol for a discarded section. */
94 Elf_Internal_Sym
*isym
;
96 /* Need to: get the symbol; get the section. */
97 isym
= &cookie
->locsyms
[r_symndx
];
98 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
100 && discard
? discarded_section (isec
) : 1)
106 /* Define a symbol in a dynamic linkage section. */
108 struct elf_link_hash_entry
*
109 _bfd_elf_define_linkage_sym (bfd
*abfd
,
110 struct bfd_link_info
*info
,
114 struct elf_link_hash_entry
*h
;
115 struct bfd_link_hash_entry
*bh
;
116 const struct elf_backend_data
*bed
;
118 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, false, false, false);
121 /* Zap symbol defined in an as-needed lib that wasn't linked.
122 This is a symptom of a larger problem: Absolute symbols
123 defined in shared libraries can't be overridden, because we
124 lose the link to the bfd which is via the symbol section. */
125 h
->root
.type
= bfd_link_hash_new
;
131 bed
= get_elf_backend_data (abfd
);
132 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
133 sec
, 0, NULL
, false, bed
->collect
,
136 h
= (struct elf_link_hash_entry
*) bh
;
137 BFD_ASSERT (h
!= NULL
);
140 h
->root
.linker_def
= 1;
141 h
->type
= STT_OBJECT
;
142 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
143 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
145 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
150 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
154 struct elf_link_hash_entry
*h
;
155 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
156 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
158 /* This function may be called more than once. */
159 if (htab
->sgot
!= NULL
)
162 flags
= bed
->dynamic_sec_flags
;
164 s
= bfd_make_section_anyway_with_flags (abfd
,
165 (bed
->rela_plts_and_copies_p
166 ? ".rela.got" : ".rel.got"),
167 (bed
->dynamic_sec_flags
170 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
174 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
176 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
180 if (bed
->want_got_plt
)
182 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
184 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
189 /* The first bit of the global offset table is the header. */
190 s
->size
+= bed
->got_header_size
;
192 if (bed
->want_got_sym
)
194 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
195 (or .got.plt) section. We don't do this in the linker script
196 because we don't want to define the symbol if we are not creating
197 a global offset table. */
198 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
199 "_GLOBAL_OFFSET_TABLE_");
200 elf_hash_table (info
)->hgot
= h
;
208 /* Create a strtab to hold the dynamic symbol names. */
210 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
212 struct elf_link_hash_table
*hash_table
;
214 hash_table
= elf_hash_table (info
);
215 if (hash_table
->dynobj
== NULL
)
217 /* We may not set dynobj, an input file holding linker created
218 dynamic sections to abfd, which may be a dynamic object with
219 its own dynamic sections. We need to find a normal input file
220 to hold linker created sections if possible. */
221 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
225 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
227 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
228 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
229 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
230 && !((s
= ibfd
->sections
) != NULL
231 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
237 hash_table
->dynobj
= abfd
;
240 if (hash_table
->dynstr
== NULL
)
242 hash_table
->dynstr
= _bfd_elf_strtab_init ();
243 if (hash_table
->dynstr
== NULL
)
249 /* Create some sections which will be filled in with dynamic linking
250 information. ABFD is an input file which requires dynamic sections
251 to be created. The dynamic sections take up virtual memory space
252 when the final executable is run, so we need to create them before
253 addresses are assigned to the output sections. We work out the
254 actual contents and size of these sections later. */
257 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
261 const struct elf_backend_data
*bed
;
262 struct elf_link_hash_entry
*h
;
264 if (! is_elf_hash_table (info
->hash
))
267 if (elf_hash_table (info
)->dynamic_sections_created
)
270 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
273 abfd
= elf_hash_table (info
)->dynobj
;
274 bed
= get_elf_backend_data (abfd
);
276 flags
= bed
->dynamic_sec_flags
;
278 /* A dynamically linked executable has a .interp section, but a
279 shared library does not. */
280 if (bfd_link_executable (info
) && !info
->nointerp
)
282 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
283 flags
| SEC_READONLY
);
288 /* Create sections to hold version informations. These are removed
289 if they are not needed. */
290 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
291 flags
| SEC_READONLY
);
293 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
296 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
297 flags
| SEC_READONLY
);
299 || !bfd_set_section_alignment (s
, 1))
302 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
303 flags
| SEC_READONLY
);
305 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
308 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
309 flags
| SEC_READONLY
);
311 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
313 elf_hash_table (info
)->dynsym
= s
;
315 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
316 flags
| SEC_READONLY
);
320 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
322 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
325 /* The special symbol _DYNAMIC is always set to the start of the
326 .dynamic section. We could set _DYNAMIC in a linker script, but we
327 only want to define it if we are, in fact, creating a .dynamic
328 section. We don't want to define it if there is no .dynamic
329 section, since on some ELF platforms the start up code examines it
330 to decide how to initialize the process. */
331 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
332 elf_hash_table (info
)->hdynamic
= h
;
338 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
339 flags
| SEC_READONLY
);
341 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
343 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
346 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
348 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
349 flags
| SEC_READONLY
);
351 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
353 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
354 4 32-bit words followed by variable count of 64-bit words, then
355 variable count of 32-bit words. */
356 if (bed
->s
->arch_size
== 64)
357 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
359 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
362 /* Let the backend create the rest of the sections. This lets the
363 backend set the right flags. The backend will normally create
364 the .got and .plt sections. */
365 if (bed
->elf_backend_create_dynamic_sections
== NULL
366 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
369 elf_hash_table (info
)->dynamic_sections_created
= true;
374 /* Create dynamic sections when linking against a dynamic object. */
377 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
379 flagword flags
, pltflags
;
380 struct elf_link_hash_entry
*h
;
382 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
383 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
385 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
386 .rel[a].bss sections. */
387 flags
= bed
->dynamic_sec_flags
;
390 if (bed
->plt_not_loaded
)
391 /* We do not clear SEC_ALLOC here because we still want the OS to
392 allocate space for the section; it's just that there's nothing
393 to read in from the object file. */
394 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
396 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
397 if (bed
->plt_readonly
)
398 pltflags
|= SEC_READONLY
;
400 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
402 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
406 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
408 if (bed
->want_plt_sym
)
410 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
411 "_PROCEDURE_LINKAGE_TABLE_");
412 elf_hash_table (info
)->hplt
= h
;
417 s
= bfd_make_section_anyway_with_flags (abfd
,
418 (bed
->rela_plts_and_copies_p
419 ? ".rela.plt" : ".rel.plt"),
420 flags
| SEC_READONLY
);
422 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
426 if (! _bfd_elf_create_got_section (abfd
, info
))
429 if (bed
->want_dynbss
)
431 /* The .dynbss section is a place to put symbols which are defined
432 by dynamic objects, are referenced by regular objects, and are
433 not functions. We must allocate space for them in the process
434 image and use a R_*_COPY reloc to tell the dynamic linker to
435 initialize them at run time. The linker script puts the .dynbss
436 section into the .bss section of the final image. */
437 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
438 SEC_ALLOC
| SEC_LINKER_CREATED
);
443 if (bed
->want_dynrelro
)
445 /* Similarly, but for symbols that were originally in read-only
446 sections. This section doesn't really need to have contents,
447 but make it like other .data.rel.ro sections. */
448 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
455 /* The .rel[a].bss section holds copy relocs. This section is not
456 normally needed. We need to create it here, though, so that the
457 linker will map it to an output section. We can't just create it
458 only if we need it, because we will not know whether we need it
459 until we have seen all the input files, and the first time the
460 main linker code calls BFD after examining all the input files
461 (size_dynamic_sections) the input sections have already been
462 mapped to the output sections. If the section turns out not to
463 be needed, we can discard it later. We will never need this
464 section when generating a shared object, since they do not use
466 if (bfd_link_executable (info
))
468 s
= bfd_make_section_anyway_with_flags (abfd
,
469 (bed
->rela_plts_and_copies_p
470 ? ".rela.bss" : ".rel.bss"),
471 flags
| SEC_READONLY
);
473 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
477 if (bed
->want_dynrelro
)
479 s
= (bfd_make_section_anyway_with_flags
480 (abfd
, (bed
->rela_plts_and_copies_p
481 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
482 flags
| SEC_READONLY
));
484 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
486 htab
->sreldynrelro
= s
;
494 /* Record a new dynamic symbol. We record the dynamic symbols as we
495 read the input files, since we need to have a list of all of them
496 before we can determine the final sizes of the output sections.
497 Note that we may actually call this function even though we are not
498 going to output any dynamic symbols; in some cases we know that a
499 symbol should be in the dynamic symbol table, but only if there is
503 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
504 struct elf_link_hash_entry
*h
)
506 if (h
->dynindx
== -1)
508 struct elf_strtab_hash
*dynstr
;
513 if (h
->root
.type
== bfd_link_hash_defined
514 || h
->root
.type
== bfd_link_hash_defweak
)
516 /* An IR symbol should not be made dynamic. */
517 if (h
->root
.u
.def
.section
!= NULL
518 && h
->root
.u
.def
.section
->owner
!= NULL
519 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
523 /* XXX: The ABI draft says the linker must turn hidden and
524 internal symbols into STB_LOCAL symbols when producing the
525 DSO. However, if ld.so honors st_other in the dynamic table,
526 this would not be necessary. */
527 switch (ELF_ST_VISIBILITY (h
->other
))
531 if (h
->root
.type
!= bfd_link_hash_undefined
532 && h
->root
.type
!= bfd_link_hash_undefweak
)
535 if (!elf_hash_table (info
)->is_relocatable_executable
536 || ((h
->root
.type
== bfd_link_hash_defined
537 || h
->root
.type
== bfd_link_hash_defweak
)
538 && h
->root
.u
.def
.section
->owner
!= NULL
539 && h
->root
.u
.def
.section
->owner
->no_export
)
540 || (h
->root
.type
== bfd_link_hash_common
541 && h
->root
.u
.c
.p
->section
->owner
!= NULL
542 && h
->root
.u
.c
.p
->section
->owner
->no_export
))
550 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
551 ++elf_hash_table (info
)->dynsymcount
;
553 dynstr
= elf_hash_table (info
)->dynstr
;
556 /* Create a strtab to hold the dynamic symbol names. */
557 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
562 /* We don't put any version information in the dynamic string
564 name
= h
->root
.root
.string
;
565 p
= strchr (name
, ELF_VER_CHR
);
567 /* We know that the p points into writable memory. In fact,
568 there are only a few symbols that have read-only names, being
569 those like _GLOBAL_OFFSET_TABLE_ that are created specially
570 by the backends. Most symbols will have names pointing into
571 an ELF string table read from a file, or to objalloc memory. */
574 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
579 if (indx
== (size_t) -1)
581 h
->dynstr_index
= indx
;
587 /* Mark a symbol dynamic. */
590 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
591 struct elf_link_hash_entry
*h
,
592 Elf_Internal_Sym
*sym
)
594 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
596 /* It may be called more than once on the same H. */
597 if(h
->dynamic
|| bfd_link_relocatable (info
))
600 if ((info
->dynamic_data
601 && (h
->type
== STT_OBJECT
602 || h
->type
== STT_COMMON
604 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
605 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
608 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
611 /* NB: If a symbol is made dynamic by --dynamic-list, it has
613 h
->root
.non_ir_ref_dynamic
= 1;
617 /* Record an assignment to a symbol made by a linker script. We need
618 this in case some dynamic object refers to this symbol. */
621 bfd_elf_record_link_assignment (bfd
*output_bfd
,
622 struct bfd_link_info
*info
,
627 struct elf_link_hash_entry
*h
, *hv
;
628 struct elf_link_hash_table
*htab
;
629 const struct elf_backend_data
*bed
;
631 if (!is_elf_hash_table (info
->hash
))
634 htab
= elf_hash_table (info
);
635 h
= elf_link_hash_lookup (htab
, name
, !provide
, true, false);
639 if (h
->root
.type
== bfd_link_hash_warning
)
640 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
642 if (h
->versioned
== unknown
)
644 /* Set versioned if symbol version is unknown. */
645 char *version
= strrchr (name
, ELF_VER_CHR
);
648 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
649 h
->versioned
= versioned_hidden
;
651 h
->versioned
= versioned
;
655 /* Symbols defined in a linker script but not referenced anywhere
656 else will have non_elf set. */
659 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
663 switch (h
->root
.type
)
665 case bfd_link_hash_defined
:
666 case bfd_link_hash_defweak
:
667 case bfd_link_hash_common
:
669 case bfd_link_hash_undefweak
:
670 case bfd_link_hash_undefined
:
671 /* Since we're defining the symbol, don't let it seem to have not
672 been defined. record_dynamic_symbol and size_dynamic_sections
673 may depend on this. */
674 h
->root
.type
= bfd_link_hash_new
;
675 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
676 bfd_link_repair_undef_list (&htab
->root
);
678 case bfd_link_hash_new
:
680 case bfd_link_hash_indirect
:
681 /* We had a versioned symbol in a dynamic library. We make the
682 the versioned symbol point to this one. */
683 bed
= get_elf_backend_data (output_bfd
);
685 while (hv
->root
.type
== bfd_link_hash_indirect
686 || hv
->root
.type
== bfd_link_hash_warning
)
687 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
688 /* We don't need to update h->root.u since linker will set them
690 h
->root
.type
= bfd_link_hash_undefined
;
691 hv
->root
.type
= bfd_link_hash_indirect
;
692 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
693 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
700 /* If this symbol is being provided by the linker script, and it is
701 currently defined by a dynamic object, but not by a regular
702 object, then mark it as undefined so that the generic linker will
703 force the correct value. */
707 h
->root
.type
= bfd_link_hash_undefined
;
709 /* If this symbol is currently defined by a dynamic object, but not
710 by a regular object, then clear out any version information because
711 the symbol will not be associated with the dynamic object any
713 if (h
->def_dynamic
&& !h
->def_regular
)
714 h
->verinfo
.verdef
= NULL
;
716 /* Make sure this symbol is not garbage collected. */
723 bed
= get_elf_backend_data (output_bfd
);
724 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
725 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
726 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
729 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
731 if (!bfd_link_relocatable (info
)
733 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
734 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
739 || bfd_link_dll (info
)
740 || elf_hash_table (info
)->is_relocatable_executable
)
744 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
747 /* If this is a weak defined symbol, and we know a corresponding
748 real symbol from the same dynamic object, make sure the real
749 symbol is also made into a dynamic symbol. */
752 struct elf_link_hash_entry
*def
= weakdef (h
);
754 if (def
->dynindx
== -1
755 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
763 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
764 success, and 2 on a failure caused by attempting to record a symbol
765 in a discarded section, eg. a discarded link-once section symbol. */
768 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
773 struct elf_link_local_dynamic_entry
*entry
;
774 struct elf_link_hash_table
*eht
;
775 struct elf_strtab_hash
*dynstr
;
778 Elf_External_Sym_Shndx eshndx
;
779 char esym
[sizeof (Elf64_External_Sym
)];
781 if (! is_elf_hash_table (info
->hash
))
784 /* See if the entry exists already. */
785 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
786 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
789 amt
= sizeof (*entry
);
790 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
794 /* Go find the symbol, so that we can find it's name. */
795 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
796 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
798 bfd_release (input_bfd
, entry
);
802 if (entry
->isym
.st_shndx
!= SHN_UNDEF
803 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
807 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
808 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
810 /* We can still bfd_release here as nothing has done another
811 bfd_alloc. We can't do this later in this function. */
812 bfd_release (input_bfd
, entry
);
817 name
= (bfd_elf_string_from_elf_section
818 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
819 entry
->isym
.st_name
));
821 dynstr
= elf_hash_table (info
)->dynstr
;
824 /* Create a strtab to hold the dynamic symbol names. */
825 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
830 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, false);
831 if (dynstr_index
== (size_t) -1)
833 entry
->isym
.st_name
= dynstr_index
;
835 eht
= elf_hash_table (info
);
837 entry
->next
= eht
->dynlocal
;
838 eht
->dynlocal
= entry
;
839 entry
->input_bfd
= input_bfd
;
840 entry
->input_indx
= input_indx
;
843 /* Whatever binding the symbol had before, it's now local. */
845 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
847 /* The dynindx will be set at the end of size_dynamic_sections. */
852 /* Return the dynindex of a local dynamic symbol. */
855 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
859 struct elf_link_local_dynamic_entry
*e
;
861 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
862 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
867 /* This function is used to renumber the dynamic symbols, if some of
868 them are removed because they are marked as local. This is called
869 via elf_link_hash_traverse. */
872 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
875 size_t *count
= (size_t *) data
;
880 if (h
->dynindx
!= -1)
881 h
->dynindx
= ++(*count
);
887 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
888 STB_LOCAL binding. */
891 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
894 size_t *count
= (size_t *) data
;
896 if (!h
->forced_local
)
899 if (h
->dynindx
!= -1)
900 h
->dynindx
= ++(*count
);
905 /* Return true if the dynamic symbol for a given section should be
906 omitted when creating a shared library. */
908 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
909 struct bfd_link_info
*info
,
912 struct elf_link_hash_table
*htab
;
915 switch (elf_section_data (p
)->this_hdr
.sh_type
)
919 /* If sh_type is yet undecided, assume it could be
920 SHT_PROGBITS/SHT_NOBITS. */
922 htab
= elf_hash_table (info
);
923 if (htab
->text_index_section
!= NULL
)
924 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
926 return (htab
->dynobj
!= NULL
927 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
928 && ip
->output_section
== p
);
930 /* There shouldn't be section relative relocations
931 against any other section. */
938 _bfd_elf_omit_section_dynsym_all
939 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
940 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
941 asection
*p ATTRIBUTE_UNUSED
)
946 /* Assign dynsym indices. In a shared library we generate a section
947 symbol for each output section, which come first. Next come symbols
948 which have been forced to local binding. Then all of the back-end
949 allocated local dynamic syms, followed by the rest of the global
950 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
951 (This prevents the early call before elf_backend_init_index_section
952 and strip_excluded_output_sections setting dynindx for sections
953 that are stripped.) */
956 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
957 struct bfd_link_info
*info
,
958 unsigned long *section_sym_count
)
960 unsigned long dynsymcount
= 0;
961 bool do_sec
= section_sym_count
!= NULL
;
963 if (bfd_link_pic (info
)
964 || elf_hash_table (info
)->is_relocatable_executable
)
966 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
968 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
969 if ((p
->flags
& SEC_EXCLUDE
) == 0
970 && (p
->flags
& SEC_ALLOC
) != 0
971 && elf_hash_table (info
)->dynamic_relocs
972 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
976 elf_section_data (p
)->dynindx
= dynsymcount
;
979 elf_section_data (p
)->dynindx
= 0;
982 *section_sym_count
= dynsymcount
;
984 elf_link_hash_traverse (elf_hash_table (info
),
985 elf_link_renumber_local_hash_table_dynsyms
,
988 if (elf_hash_table (info
)->dynlocal
)
990 struct elf_link_local_dynamic_entry
*p
;
991 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
992 p
->dynindx
= ++dynsymcount
;
994 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
996 elf_link_hash_traverse (elf_hash_table (info
),
997 elf_link_renumber_hash_table_dynsyms
,
1000 /* There is an unused NULL entry at the head of the table which we
1001 must account for in our count even if the table is empty since it
1002 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
1003 .dynamic section. */
1006 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
1010 /* Merge st_other field. */
1013 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
1014 unsigned int st_other
, asection
*sec
,
1015 bool definition
, bool dynamic
)
1017 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1019 /* If st_other has a processor-specific meaning, specific
1020 code might be needed here. */
1021 if (bed
->elf_backend_merge_symbol_attribute
)
1022 (*bed
->elf_backend_merge_symbol_attribute
) (h
, st_other
, definition
,
1027 unsigned symvis
= ELF_ST_VISIBILITY (st_other
);
1028 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1030 /* Keep the most constraining visibility. Leave the remainder
1031 of the st_other field to elf_backend_merge_symbol_attribute. */
1032 if (symvis
- 1 < hvis
- 1)
1033 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1036 && ELF_ST_VISIBILITY (st_other
) != STV_DEFAULT
1037 && (sec
->flags
& SEC_READONLY
) == 0)
1038 h
->protected_def
= 1;
1041 /* This function is called when we want to merge a new symbol with an
1042 existing symbol. It handles the various cases which arise when we
1043 find a definition in a dynamic object, or when there is already a
1044 definition in a dynamic object. The new symbol is described by
1045 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1046 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1047 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1048 of an old common symbol. We set OVERRIDE if the old symbol is
1049 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1050 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1051 to change. By OK to change, we mean that we shouldn't warn if the
1052 type or size does change. */
1055 _bfd_elf_merge_symbol (bfd
*abfd
,
1056 struct bfd_link_info
*info
,
1058 Elf_Internal_Sym
*sym
,
1061 struct elf_link_hash_entry
**sym_hash
,
1064 unsigned int *pold_alignment
,
1067 bool *type_change_ok
,
1068 bool *size_change_ok
,
1071 asection
*sec
, *oldsec
;
1072 struct elf_link_hash_entry
*h
;
1073 struct elf_link_hash_entry
*hi
;
1074 struct elf_link_hash_entry
*flip
;
1077 bool newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1078 bool newweak
, oldweak
, newfunc
, oldfunc
;
1079 const struct elf_backend_data
*bed
;
1081 bool default_sym
= *matched
;
1087 bind
= ELF_ST_BIND (sym
->st_info
);
1089 if (! bfd_is_und_section (sec
))
1090 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
1092 h
= ((struct elf_link_hash_entry
*)
1093 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
1098 bed
= get_elf_backend_data (abfd
);
1100 /* NEW_VERSION is the symbol version of the new symbol. */
1101 if (h
->versioned
!= unversioned
)
1103 /* Symbol version is unknown or versioned. */
1104 new_version
= strrchr (name
, ELF_VER_CHR
);
1107 if (h
->versioned
== unknown
)
1109 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1110 h
->versioned
= versioned_hidden
;
1112 h
->versioned
= versioned
;
1115 if (new_version
[0] == '\0')
1119 h
->versioned
= unversioned
;
1124 /* For merging, we only care about real symbols. But we need to make
1125 sure that indirect symbol dynamic flags are updated. */
1127 while (h
->root
.type
== bfd_link_hash_indirect
1128 || h
->root
.type
== bfd_link_hash_warning
)
1129 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1133 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1137 /* OLD_HIDDEN is true if the existing symbol is only visible
1138 to the symbol with the same symbol version. NEW_HIDDEN is
1139 true if the new symbol is only visible to the symbol with
1140 the same symbol version. */
1141 bool old_hidden
= h
->versioned
== versioned_hidden
;
1142 bool new_hidden
= hi
->versioned
== versioned_hidden
;
1143 if (!old_hidden
&& !new_hidden
)
1144 /* The new symbol matches the existing symbol if both
1149 /* OLD_VERSION is the symbol version of the existing
1153 if (h
->versioned
>= versioned
)
1154 old_version
= strrchr (h
->root
.root
.string
,
1159 /* The new symbol matches the existing symbol if they
1160 have the same symbol version. */
1161 *matched
= (old_version
== new_version
1162 || (old_version
!= NULL
1163 && new_version
!= NULL
1164 && strcmp (old_version
, new_version
) == 0));
1169 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1174 switch (h
->root
.type
)
1179 case bfd_link_hash_undefined
:
1180 case bfd_link_hash_undefweak
:
1181 oldbfd
= h
->root
.u
.undef
.abfd
;
1184 case bfd_link_hash_defined
:
1185 case bfd_link_hash_defweak
:
1186 oldbfd
= h
->root
.u
.def
.section
->owner
;
1187 oldsec
= h
->root
.u
.def
.section
;
1190 case bfd_link_hash_common
:
1191 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1192 oldsec
= h
->root
.u
.c
.p
->section
;
1194 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1197 if (poldbfd
&& *poldbfd
== NULL
)
1200 /* Differentiate strong and weak symbols. */
1201 newweak
= bind
== STB_WEAK
;
1202 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1203 || h
->root
.type
== bfd_link_hash_undefweak
);
1205 *pold_weak
= oldweak
;
1207 /* We have to check it for every instance since the first few may be
1208 references and not all compilers emit symbol type for undefined
1210 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1212 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1213 respectively, is from a dynamic object. */
1215 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1217 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1218 syms and defined syms in dynamic libraries respectively.
1219 ref_dynamic on the other hand can be set for a symbol defined in
1220 a dynamic library, and def_dynamic may not be set; When the
1221 definition in a dynamic lib is overridden by a definition in the
1222 executable use of the symbol in the dynamic lib becomes a
1223 reference to the executable symbol. */
1226 if (bfd_is_und_section (sec
))
1228 if (bind
!= STB_WEAK
)
1230 h
->ref_dynamic_nonweak
= 1;
1231 hi
->ref_dynamic_nonweak
= 1;
1236 /* Update the existing symbol only if they match. */
1239 hi
->dynamic_def
= 1;
1243 /* If we just created the symbol, mark it as being an ELF symbol.
1244 Other than that, there is nothing to do--there is no merge issue
1245 with a newly defined symbol--so we just return. */
1247 if (h
->root
.type
== bfd_link_hash_new
)
1253 /* In cases involving weak versioned symbols, we may wind up trying
1254 to merge a symbol with itself. Catch that here, to avoid the
1255 confusion that results if we try to override a symbol with
1256 itself. The additional tests catch cases like
1257 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1258 dynamic object, which we do want to handle here. */
1260 && (newweak
|| oldweak
)
1261 && ((abfd
->flags
& DYNAMIC
) == 0
1262 || !h
->def_regular
))
1267 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1268 else if (oldsec
!= NULL
)
1270 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1271 indices used by MIPS ELF. */
1272 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1275 /* Handle a case where plugin_notice won't be called and thus won't
1276 set the non_ir_ref flags on the first pass over symbols. */
1278 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
)
1279 && newdyn
!= olddyn
)
1281 h
->root
.non_ir_ref_dynamic
= true;
1282 hi
->root
.non_ir_ref_dynamic
= true;
1285 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1286 respectively, appear to be a definition rather than reference. */
1288 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1290 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1291 && h
->root
.type
!= bfd_link_hash_undefweak
1292 && h
->root
.type
!= bfd_link_hash_common
);
1294 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1295 respectively, appear to be a function. */
1297 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1298 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1300 oldfunc
= (h
->type
!= STT_NOTYPE
1301 && bed
->is_function_type (h
->type
));
1303 if (!(newfunc
&& oldfunc
)
1304 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1305 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1306 && h
->type
!= STT_NOTYPE
1307 && (newdef
|| bfd_is_com_section (sec
))
1308 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1310 /* If creating a default indirect symbol ("foo" or "foo@") from
1311 a dynamic versioned definition ("foo@@") skip doing so if
1312 there is an existing regular definition with a different
1313 type. We don't want, for example, a "time" variable in the
1314 executable overriding a "time" function in a shared library. */
1322 /* When adding a symbol from a regular object file after we have
1323 created indirect symbols, undo the indirection and any
1330 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1331 h
->forced_local
= 0;
1335 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1337 h
->root
.type
= bfd_link_hash_undefined
;
1338 h
->root
.u
.undef
.abfd
= abfd
;
1342 h
->root
.type
= bfd_link_hash_new
;
1343 h
->root
.u
.undef
.abfd
= NULL
;
1349 /* Check TLS symbols. We don't check undefined symbols introduced
1350 by "ld -u" which have no type (and oldbfd NULL), and we don't
1351 check symbols from plugins because they also have no type. */
1353 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1354 && (abfd
->flags
& BFD_PLUGIN
) == 0
1355 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1356 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1360 asection
*ntsec
, *tsec
;
1362 if (h
->type
== STT_TLS
)
1383 /* xgettext:c-format */
1384 (_("%s: TLS definition in %pB section %pA "
1385 "mismatches non-TLS definition in %pB section %pA"),
1386 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1387 else if (!tdef
&& !ntdef
)
1389 /* xgettext:c-format */
1390 (_("%s: TLS reference in %pB "
1391 "mismatches non-TLS reference in %pB"),
1392 h
->root
.root
.string
, tbfd
, ntbfd
);
1395 /* xgettext:c-format */
1396 (_("%s: TLS definition in %pB section %pA "
1397 "mismatches non-TLS reference in %pB"),
1398 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1401 /* xgettext:c-format */
1402 (_("%s: TLS reference in %pB "
1403 "mismatches non-TLS definition in %pB section %pA"),
1404 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1406 bfd_set_error (bfd_error_bad_value
);
1410 /* If the old symbol has non-default visibility, we ignore the new
1411 definition from a dynamic object. */
1413 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1414 && !bfd_is_und_section (sec
))
1417 /* Make sure this symbol is dynamic. */
1419 hi
->ref_dynamic
= 1;
1420 /* A protected symbol has external availability. Make sure it is
1421 recorded as dynamic.
1423 FIXME: Should we check type and size for protected symbol? */
1424 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1425 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1430 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1433 /* If the new symbol with non-default visibility comes from a
1434 relocatable file and the old definition comes from a dynamic
1435 object, we remove the old definition. */
1436 if (hi
->root
.type
== bfd_link_hash_indirect
)
1438 /* Handle the case where the old dynamic definition is
1439 default versioned. We need to copy the symbol info from
1440 the symbol with default version to the normal one if it
1441 was referenced before. */
1444 hi
->root
.type
= h
->root
.type
;
1445 h
->root
.type
= bfd_link_hash_indirect
;
1446 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1448 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1449 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1451 /* If the new symbol is hidden or internal, completely undo
1452 any dynamic link state. */
1453 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1454 h
->forced_local
= 0;
1461 /* FIXME: Should we check type and size for protected symbol? */
1471 /* If the old symbol was undefined before, then it will still be
1472 on the undefs list. If the new symbol is undefined or
1473 common, we can't make it bfd_link_hash_new here, because new
1474 undefined or common symbols will be added to the undefs list
1475 by _bfd_generic_link_add_one_symbol. Symbols may not be
1476 added twice to the undefs list. Also, if the new symbol is
1477 undefweak then we don't want to lose the strong undef. */
1478 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1480 h
->root
.type
= bfd_link_hash_undefined
;
1481 h
->root
.u
.undef
.abfd
= abfd
;
1485 h
->root
.type
= bfd_link_hash_new
;
1486 h
->root
.u
.undef
.abfd
= NULL
;
1489 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1491 /* If the new symbol is hidden or internal, completely undo
1492 any dynamic link state. */
1493 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1494 h
->forced_local
= 0;
1500 /* FIXME: Should we check type and size for protected symbol? */
1506 /* If a new weak symbol definition comes from a regular file and the
1507 old symbol comes from a dynamic library, we treat the new one as
1508 strong. Similarly, an old weak symbol definition from a regular
1509 file is treated as strong when the new symbol comes from a dynamic
1510 library. Further, an old weak symbol from a dynamic library is
1511 treated as strong if the new symbol is from a dynamic library.
1512 This reflects the way glibc's ld.so works.
1514 Also allow a weak symbol to override a linker script symbol
1515 defined by an early pass over the script. This is done so the
1516 linker knows the symbol is defined in an object file, for the
1517 DEFINED script function.
1519 Do this before setting *type_change_ok or *size_change_ok so that
1520 we warn properly when dynamic library symbols are overridden. */
1522 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1524 if (olddef
&& newdyn
)
1527 /* Allow changes between different types of function symbol. */
1528 if (newfunc
&& oldfunc
)
1529 *type_change_ok
= true;
1531 /* It's OK to change the type if either the existing symbol or the
1532 new symbol is weak. A type change is also OK if the old symbol
1533 is undefined and the new symbol is defined. */
1538 && h
->root
.type
== bfd_link_hash_undefined
))
1539 *type_change_ok
= true;
1541 /* It's OK to change the size if either the existing symbol or the
1542 new symbol is weak, or if the old symbol is undefined. */
1545 || h
->root
.type
== bfd_link_hash_undefined
)
1546 *size_change_ok
= true;
1548 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1549 symbol, respectively, appears to be a common symbol in a dynamic
1550 object. If a symbol appears in an uninitialized section, and is
1551 not weak, and is not a function, then it may be a common symbol
1552 which was resolved when the dynamic object was created. We want
1553 to treat such symbols specially, because they raise special
1554 considerations when setting the symbol size: if the symbol
1555 appears as a common symbol in a regular object, and the size in
1556 the regular object is larger, we must make sure that we use the
1557 larger size. This problematic case can always be avoided in C,
1558 but it must be handled correctly when using Fortran shared
1561 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1562 likewise for OLDDYNCOMMON and OLDDEF.
1564 Note that this test is just a heuristic, and that it is quite
1565 possible to have an uninitialized symbol in a shared object which
1566 is really a definition, rather than a common symbol. This could
1567 lead to some minor confusion when the symbol really is a common
1568 symbol in some regular object. However, I think it will be
1574 && (sec
->flags
& SEC_ALLOC
) != 0
1575 && (sec
->flags
& SEC_LOAD
) == 0
1578 newdyncommon
= true;
1580 newdyncommon
= false;
1584 && h
->root
.type
== bfd_link_hash_defined
1586 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1587 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1590 olddyncommon
= true;
1592 olddyncommon
= false;
1594 /* We now know everything about the old and new symbols. We ask the
1595 backend to check if we can merge them. */
1596 if (bed
->merge_symbol
!= NULL
)
1598 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1603 /* There are multiple definitions of a normal symbol. Skip the
1604 default symbol as well as definition from an IR object. */
1605 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1606 && !default_sym
&& h
->def_regular
1608 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1609 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1611 /* Handle a multiple definition. */
1612 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1613 abfd
, sec
, *pvalue
);
1618 /* If both the old and the new symbols look like common symbols in a
1619 dynamic object, set the size of the symbol to the larger of the
1624 && sym
->st_size
!= h
->size
)
1626 /* Since we think we have two common symbols, issue a multiple
1627 common warning if desired. Note that we only warn if the
1628 size is different. If the size is the same, we simply let
1629 the old symbol override the new one as normally happens with
1630 symbols defined in dynamic objects. */
1632 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1633 bfd_link_hash_common
, sym
->st_size
);
1634 if (sym
->st_size
> h
->size
)
1635 h
->size
= sym
->st_size
;
1637 *size_change_ok
= true;
1640 /* If we are looking at a dynamic object, and we have found a
1641 definition, we need to see if the symbol was already defined by
1642 some other object. If so, we want to use the existing
1643 definition, and we do not want to report a multiple symbol
1644 definition error; we do this by clobbering *PSEC to be
1645 bfd_und_section_ptr.
1647 We treat a common symbol as a definition if the symbol in the
1648 shared library is a function, since common symbols always
1649 represent variables; this can cause confusion in principle, but
1650 any such confusion would seem to indicate an erroneous program or
1651 shared library. We also permit a common symbol in a regular
1652 object to override a weak symbol in a shared object. */
1657 || (h
->root
.type
== bfd_link_hash_common
1658 && (newweak
|| newfunc
))))
1662 newdyncommon
= false;
1664 *psec
= sec
= bfd_und_section_ptr
;
1665 *size_change_ok
= true;
1667 /* If we get here when the old symbol is a common symbol, then
1668 we are explicitly letting it override a weak symbol or
1669 function in a dynamic object, and we don't want to warn about
1670 a type change. If the old symbol is a defined symbol, a type
1671 change warning may still be appropriate. */
1673 if (h
->root
.type
== bfd_link_hash_common
)
1674 *type_change_ok
= true;
1677 /* Handle the special case of an old common symbol merging with a
1678 new symbol which looks like a common symbol in a shared object.
1679 We change *PSEC and *PVALUE to make the new symbol look like a
1680 common symbol, and let _bfd_generic_link_add_one_symbol do the
1684 && h
->root
.type
== bfd_link_hash_common
)
1688 newdyncommon
= false;
1689 *pvalue
= sym
->st_size
;
1690 *psec
= sec
= bed
->common_section (oldsec
);
1691 *size_change_ok
= true;
1694 /* Skip weak definitions of symbols that are already defined. */
1695 if (newdef
&& olddef
&& newweak
)
1697 /* Don't skip new non-IR weak syms. */
1698 if (!(oldbfd
!= NULL
1699 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1700 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1706 /* Merge st_other. If the symbol already has a dynamic index,
1707 but visibility says it should not be visible, turn it into a
1709 elf_merge_st_other (abfd
, h
, sym
->st_other
, sec
, newdef
, newdyn
);
1710 if (h
->dynindx
!= -1)
1711 switch (ELF_ST_VISIBILITY (h
->other
))
1715 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1720 /* If the old symbol is from a dynamic object, and the new symbol is
1721 a definition which is not from a dynamic object, then the new
1722 symbol overrides the old symbol. Symbols from regular files
1723 always take precedence over symbols from dynamic objects, even if
1724 they are defined after the dynamic object in the link.
1726 As above, we again permit a common symbol in a regular object to
1727 override a definition in a shared object if the shared object
1728 symbol is a function or is weak. */
1733 || (bfd_is_com_section (sec
)
1734 && (oldweak
|| oldfunc
)))
1739 /* Change the hash table entry to undefined, and let
1740 _bfd_generic_link_add_one_symbol do the right thing with the
1743 h
->root
.type
= bfd_link_hash_undefined
;
1744 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1745 *size_change_ok
= true;
1748 olddyncommon
= false;
1750 /* We again permit a type change when a common symbol may be
1751 overriding a function. */
1753 if (bfd_is_com_section (sec
))
1757 /* If a common symbol overrides a function, make sure
1758 that it isn't defined dynamically nor has type
1761 h
->type
= STT_NOTYPE
;
1763 *type_change_ok
= true;
1766 if (hi
->root
.type
== bfd_link_hash_indirect
)
1769 /* This union may have been set to be non-NULL when this symbol
1770 was seen in a dynamic object. We must force the union to be
1771 NULL, so that it is correct for a regular symbol. */
1772 h
->verinfo
.vertree
= NULL
;
1775 /* Handle the special case of a new common symbol merging with an
1776 old symbol that looks like it might be a common symbol defined in
1777 a shared object. Note that we have already handled the case in
1778 which a new common symbol should simply override the definition
1779 in the shared library. */
1782 && bfd_is_com_section (sec
)
1785 /* It would be best if we could set the hash table entry to a
1786 common symbol, but we don't know what to use for the section
1787 or the alignment. */
1788 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1789 bfd_link_hash_common
, sym
->st_size
);
1791 /* If the presumed common symbol in the dynamic object is
1792 larger, pretend that the new symbol has its size. */
1794 if (h
->size
> *pvalue
)
1797 /* We need to remember the alignment required by the symbol
1798 in the dynamic object. */
1799 BFD_ASSERT (pold_alignment
);
1800 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1803 olddyncommon
= false;
1805 h
->root
.type
= bfd_link_hash_undefined
;
1806 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1808 *size_change_ok
= true;
1809 *type_change_ok
= true;
1811 if (hi
->root
.type
== bfd_link_hash_indirect
)
1814 h
->verinfo
.vertree
= NULL
;
1819 /* Handle the case where we had a versioned symbol in a dynamic
1820 library and now find a definition in a normal object. In this
1821 case, we make the versioned symbol point to the normal one. */
1822 flip
->root
.type
= h
->root
.type
;
1823 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1824 h
->root
.type
= bfd_link_hash_indirect
;
1825 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1826 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1830 flip
->ref_dynamic
= 1;
1837 /* This function is called to create an indirect symbol from the
1838 default for the symbol with the default version if needed. The
1839 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1840 set DYNSYM if the new indirect symbol is dynamic. */
1843 _bfd_elf_add_default_symbol (bfd
*abfd
,
1844 struct bfd_link_info
*info
,
1845 struct elf_link_hash_entry
*h
,
1847 Elf_Internal_Sym
*sym
,
1853 bool type_change_ok
;
1854 bool size_change_ok
;
1857 struct elf_link_hash_entry
*hi
;
1858 struct bfd_link_hash_entry
*bh
;
1859 const struct elf_backend_data
*bed
;
1864 size_t len
, shortlen
;
1868 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1871 /* If this symbol has a version, and it is the default version, we
1872 create an indirect symbol from the default name to the fully
1873 decorated name. This will cause external references which do not
1874 specify a version to be bound to this version of the symbol. */
1875 p
= strchr (name
, ELF_VER_CHR
);
1876 if (h
->versioned
== unknown
)
1880 h
->versioned
= unversioned
;
1885 if (p
[1] != ELF_VER_CHR
)
1887 h
->versioned
= versioned_hidden
;
1891 h
->versioned
= versioned
;
1896 /* PR ld/19073: We may see an unversioned definition after the
1902 bed
= get_elf_backend_data (abfd
);
1903 collect
= bed
->collect
;
1904 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1906 shortlen
= p
- name
;
1907 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1908 if (shortname
== NULL
)
1910 memcpy (shortname
, name
, shortlen
);
1911 shortname
[shortlen
] = '\0';
1913 /* We are going to create a new symbol. Merge it with any existing
1914 symbol with this name. For the purposes of the merge, act as
1915 though we were defining the symbol we just defined, although we
1916 actually going to define an indirect symbol. */
1917 type_change_ok
= false;
1918 size_change_ok
= false;
1921 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1922 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1923 &type_change_ok
, &size_change_ok
, &matched
))
1929 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1931 /* If the undecorated symbol will have a version added by a
1932 script different to H, then don't indirect to/from the
1933 undecorated symbol. This isn't ideal because we may not yet
1934 have seen symbol versions, if given by a script on the
1935 command line rather than via --version-script. */
1936 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1941 = bfd_find_version_for_sym (info
->version_info
,
1942 hi
->root
.root
.string
, &hide
);
1943 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1945 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
1949 if (hi
->verinfo
.vertree
!= NULL
1950 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1956 /* Add the default symbol if not performing a relocatable link. */
1957 if (! bfd_link_relocatable (info
))
1960 if (bh
->type
== bfd_link_hash_defined
1961 && bh
->u
.def
.section
->owner
!= NULL
1962 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1964 /* Mark the previous definition from IR object as
1965 undefined so that the generic linker will override
1967 bh
->type
= bfd_link_hash_undefined
;
1968 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1970 if (! (_bfd_generic_link_add_one_symbol
1971 (info
, abfd
, shortname
, BSF_INDIRECT
,
1972 bfd_ind_section_ptr
,
1973 0, name
, false, collect
, &bh
)))
1975 hi
= (struct elf_link_hash_entry
*) bh
;
1980 /* In this case the symbol named SHORTNAME is overriding the
1981 indirect symbol we want to add. We were planning on making
1982 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1983 is the name without a version. NAME is the fully versioned
1984 name, and it is the default version.
1986 Overriding means that we already saw a definition for the
1987 symbol SHORTNAME in a regular object, and it is overriding
1988 the symbol defined in the dynamic object.
1990 When this happens, we actually want to change NAME, the
1991 symbol we just added, to refer to SHORTNAME. This will cause
1992 references to NAME in the shared object to become references
1993 to SHORTNAME in the regular object. This is what we expect
1994 when we override a function in a shared object: that the
1995 references in the shared object will be mapped to the
1996 definition in the regular object. */
1998 while (hi
->root
.type
== bfd_link_hash_indirect
1999 || hi
->root
.type
== bfd_link_hash_warning
)
2000 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2002 h
->root
.type
= bfd_link_hash_indirect
;
2003 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
2007 hi
->ref_dynamic
= 1;
2011 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
2016 /* Now set HI to H, so that the following code will set the
2017 other fields correctly. */
2021 /* Check if HI is a warning symbol. */
2022 if (hi
->root
.type
== bfd_link_hash_warning
)
2023 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2025 /* If there is a duplicate definition somewhere, then HI may not
2026 point to an indirect symbol. We will have reported an error to
2027 the user in that case. */
2029 if (hi
->root
.type
== bfd_link_hash_indirect
)
2031 struct elf_link_hash_entry
*ht
;
2033 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2034 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2036 /* If we first saw a reference to SHORTNAME with non-default
2037 visibility, merge that visibility to the @@VER symbol. */
2038 elf_merge_st_other (abfd
, ht
, hi
->other
, sec
, true, dynamic
);
2040 /* A reference to the SHORTNAME symbol from a dynamic library
2041 will be satisfied by the versioned symbol at runtime. In
2042 effect, we have a reference to the versioned symbol. */
2043 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2044 hi
->dynamic_def
|= ht
->dynamic_def
;
2046 /* See if the new flags lead us to realize that the symbol must
2052 if (! bfd_link_executable (info
)
2059 if (hi
->ref_regular
)
2065 /* We also need to define an indirection from the nondefault version
2069 len
= strlen (name
);
2070 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2071 if (shortname
== NULL
)
2073 memcpy (shortname
, name
, shortlen
);
2074 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2076 /* Once again, merge with any existing symbol. */
2077 type_change_ok
= false;
2078 size_change_ok
= false;
2080 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2081 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2082 &type_change_ok
, &size_change_ok
, &matched
))
2088 && h
->root
.type
== bfd_link_hash_defweak
2089 && hi
->root
.type
== bfd_link_hash_defined
)
2091 /* We are handling a weak sym@@ver and attempting to define
2092 a weak sym@ver, but _bfd_elf_merge_symbol said to skip the
2093 new weak sym@ver because there is already a strong sym@ver.
2094 However, sym@ver and sym@@ver are really the same symbol.
2095 The existing strong sym@ver ought to override sym@@ver. */
2096 h
->root
.type
= bfd_link_hash_defined
;
2097 h
->root
.u
.def
.section
= hi
->root
.u
.def
.section
;
2098 h
->root
.u
.def
.value
= hi
->root
.u
.def
.value
;
2099 hi
->root
.type
= bfd_link_hash_indirect
;
2100 hi
->root
.u
.i
.link
= &h
->root
;
2107 /* Here SHORTNAME is a versioned name, so we don't expect to see
2108 the type of override we do in the case above unless it is
2109 overridden by a versioned definition. */
2110 if (hi
->root
.type
!= bfd_link_hash_defined
2111 && hi
->root
.type
!= bfd_link_hash_defweak
)
2113 /* xgettext:c-format */
2114 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2121 if (! (_bfd_generic_link_add_one_symbol
2122 (info
, abfd
, shortname
, BSF_INDIRECT
,
2123 bfd_ind_section_ptr
, 0, name
, false, collect
, &bh
)))
2125 hi
= (struct elf_link_hash_entry
*) bh
;
2128 /* If there is a duplicate definition somewhere, then HI may not
2129 point to an indirect symbol. We will have reported an error
2130 to the user in that case. */
2131 if (hi
->root
.type
== bfd_link_hash_indirect
)
2133 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2134 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2135 hi
->dynamic_def
|= h
->dynamic_def
;
2137 /* If we first saw a reference to @VER symbol with
2138 non-default visibility, merge that visibility to the
2140 elf_merge_st_other (abfd
, h
, hi
->other
, sec
, true, dynamic
);
2142 /* See if the new flags lead us to realize that the symbol
2148 if (! bfd_link_executable (info
)
2154 if (hi
->ref_regular
)
2163 /* This routine is used to export all defined symbols into the dynamic
2164 symbol table. It is called via elf_link_hash_traverse. */
2167 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2169 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2171 /* Ignore indirect symbols. These are added by the versioning code. */
2172 if (h
->root
.type
== bfd_link_hash_indirect
)
2175 /* Ignore this if we won't export it. */
2176 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2179 if (h
->dynindx
== -1
2180 && (h
->def_regular
|| h
->ref_regular
)
2181 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2182 h
->root
.root
.string
))
2184 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2194 /* Look through the symbols which are defined in other shared
2195 libraries and referenced here. Update the list of version
2196 dependencies. This will be put into the .gnu.version_r section.
2197 This function is called via elf_link_hash_traverse. */
2200 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2203 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2204 Elf_Internal_Verneed
*t
;
2205 Elf_Internal_Vernaux
*a
;
2208 /* We only care about symbols defined in shared objects with version
2213 || h
->verinfo
.verdef
== NULL
2214 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2215 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2218 /* See if we already know about this version. */
2219 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2223 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2226 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2227 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2233 /* This is a new version. Add it to tree we are building. */
2238 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2241 rinfo
->failed
= true;
2245 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2246 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2247 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2251 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2254 rinfo
->failed
= true;
2258 /* Note that we are copying a string pointer here, and testing it
2259 above. If bfd_elf_string_from_elf_section is ever changed to
2260 discard the string data when low in memory, this will have to be
2262 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2264 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2265 a
->vna_nextptr
= t
->vn_auxptr
;
2267 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2270 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2277 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2278 hidden. Set *T_P to NULL if there is no match. */
2281 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2282 struct elf_link_hash_entry
*h
,
2283 const char *version_p
,
2284 struct bfd_elf_version_tree
**t_p
,
2287 struct bfd_elf_version_tree
*t
;
2289 /* Look for the version. If we find it, it is no longer weak. */
2290 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2292 if (strcmp (t
->name
, version_p
) == 0)
2296 struct bfd_elf_version_expr
*d
;
2298 len
= version_p
- h
->root
.root
.string
;
2299 alc
= (char *) bfd_malloc (len
);
2302 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2303 alc
[len
- 1] = '\0';
2304 if (alc
[len
- 2] == ELF_VER_CHR
)
2305 alc
[len
- 2] = '\0';
2307 h
->verinfo
.vertree
= t
;
2311 if (t
->globals
.list
!= NULL
)
2312 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2314 /* See if there is anything to force this symbol to
2316 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2318 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2321 && ! info
->export_dynamic
)
2335 /* Return TRUE if the symbol H is hidden by version script. */
2338 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2339 struct elf_link_hash_entry
*h
)
2343 const struct elf_backend_data
*bed
2344 = get_elf_backend_data (info
->output_bfd
);
2346 /* Version script only hides symbols defined in regular objects. */
2347 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2350 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2351 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2353 struct bfd_elf_version_tree
*t
;
2356 if (*p
== ELF_VER_CHR
)
2360 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2364 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2369 /* If we don't have a version for this symbol, see if we can find
2371 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2374 = bfd_find_version_for_sym (info
->version_info
,
2375 h
->root
.root
.string
, &hide
);
2376 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2378 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2386 /* Figure out appropriate versions for all the symbols. We may not
2387 have the version number script until we have read all of the input
2388 files, so until that point we don't know which symbols should be
2389 local. This function is called via elf_link_hash_traverse. */
2392 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2394 struct elf_info_failed
*sinfo
;
2395 struct bfd_link_info
*info
;
2396 const struct elf_backend_data
*bed
;
2397 struct elf_info_failed eif
;
2401 sinfo
= (struct elf_info_failed
*) data
;
2404 /* Fix the symbol flags. */
2407 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2410 sinfo
->failed
= true;
2414 bed
= get_elf_backend_data (info
->output_bfd
);
2416 /* We only need version numbers for symbols defined in regular
2418 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2420 /* Hide symbols defined in discarded input sections. */
2421 if ((h
->root
.type
== bfd_link_hash_defined
2422 || h
->root
.type
== bfd_link_hash_defweak
)
2423 && discarded_section (h
->root
.u
.def
.section
))
2424 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2429 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2430 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2432 struct bfd_elf_version_tree
*t
;
2435 if (*p
== ELF_VER_CHR
)
2438 /* If there is no version string, we can just return out. */
2442 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2444 sinfo
->failed
= true;
2449 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2451 /* If we are building an application, we need to create a
2452 version node for this version. */
2453 if (t
== NULL
&& bfd_link_executable (info
))
2455 struct bfd_elf_version_tree
**pp
;
2458 /* If we aren't going to export this symbol, we don't need
2459 to worry about it. */
2460 if (h
->dynindx
== -1)
2463 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2467 sinfo
->failed
= true;
2472 t
->name_indx
= (unsigned int) -1;
2476 /* Don't count anonymous version tag. */
2477 if (sinfo
->info
->version_info
!= NULL
2478 && sinfo
->info
->version_info
->vernum
== 0)
2480 for (pp
= &sinfo
->info
->version_info
;
2484 t
->vernum
= version_index
;
2488 h
->verinfo
.vertree
= t
;
2492 /* We could not find the version for a symbol when
2493 generating a shared archive. Return an error. */
2495 /* xgettext:c-format */
2496 (_("%pB: version node not found for symbol %s"),
2497 info
->output_bfd
, h
->root
.root
.string
);
2498 bfd_set_error (bfd_error_bad_value
);
2499 sinfo
->failed
= true;
2504 /* If we don't have a version for this symbol, see if we can find
2507 && h
->verinfo
.vertree
== NULL
2508 && sinfo
->info
->version_info
!= NULL
)
2511 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2512 h
->root
.root
.string
, &hide
);
2513 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2514 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2520 /* Read and swap the relocs from the section indicated by SHDR. This
2521 may be either a REL or a RELA section. The relocations are
2522 translated into RELA relocations and stored in INTERNAL_RELOCS,
2523 which should have already been allocated to contain enough space.
2524 The EXTERNAL_RELOCS are a buffer where the external form of the
2525 relocations should be stored.
2527 Returns FALSE if something goes wrong. */
2530 elf_link_read_relocs_from_section (bfd
*abfd
,
2532 Elf_Internal_Shdr
*shdr
,
2533 void *external_relocs
,
2534 Elf_Internal_Rela
*internal_relocs
)
2536 const struct elf_backend_data
*bed
;
2537 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2538 const bfd_byte
*erela
;
2539 const bfd_byte
*erelaend
;
2540 Elf_Internal_Rela
*irela
;
2541 Elf_Internal_Shdr
*symtab_hdr
;
2544 /* Position ourselves at the start of the section. */
2545 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2548 /* Read the relocations. */
2549 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2552 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2553 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2555 bed
= get_elf_backend_data (abfd
);
2557 /* Convert the external relocations to the internal format. */
2558 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2559 swap_in
= bed
->s
->swap_reloc_in
;
2560 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2561 swap_in
= bed
->s
->swap_reloca_in
;
2564 bfd_set_error (bfd_error_wrong_format
);
2568 erela
= (const bfd_byte
*) external_relocs
;
2569 /* Setting erelaend like this and comparing with <= handles case of
2570 a fuzzed object with sh_size not a multiple of sh_entsize. */
2571 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2572 irela
= internal_relocs
;
2573 while (erela
<= erelaend
)
2577 (*swap_in
) (abfd
, erela
, irela
);
2578 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2579 if (bed
->s
->arch_size
== 64)
2583 if ((size_t) r_symndx
>= nsyms
)
2586 /* xgettext:c-format */
2587 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2588 " for offset %#" PRIx64
" in section `%pA'"),
2589 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2590 (uint64_t) irela
->r_offset
, sec
);
2591 bfd_set_error (bfd_error_bad_value
);
2595 else if (r_symndx
!= STN_UNDEF
)
2598 /* xgettext:c-format */
2599 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2600 " for offset %#" PRIx64
" in section `%pA'"
2601 " when the object file has no symbol table"),
2602 abfd
, (uint64_t) r_symndx
,
2603 (uint64_t) irela
->r_offset
, sec
);
2604 bfd_set_error (bfd_error_bad_value
);
2607 irela
+= bed
->s
->int_rels_per_ext_rel
;
2608 erela
+= shdr
->sh_entsize
;
2614 /* Read and swap the relocs for a section O. They may have been
2615 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2616 not NULL, they are used as buffers to read into. They are known to
2617 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2618 the return value is allocated using either malloc or bfd_alloc,
2619 according to the KEEP_MEMORY argument. If O has two relocation
2620 sections (both REL and RELA relocations), then the REL_HDR
2621 relocations will appear first in INTERNAL_RELOCS, followed by the
2622 RELA_HDR relocations. */
2625 _bfd_elf_link_read_relocs (bfd
*abfd
,
2627 void *external_relocs
,
2628 Elf_Internal_Rela
*internal_relocs
,
2631 void *alloc1
= NULL
;
2632 Elf_Internal_Rela
*alloc2
= NULL
;
2633 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2634 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2635 Elf_Internal_Rela
*internal_rela_relocs
;
2637 if (esdo
->relocs
!= NULL
)
2638 return esdo
->relocs
;
2640 if (o
->reloc_count
== 0)
2643 if (internal_relocs
== NULL
)
2647 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2649 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2651 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2652 if (internal_relocs
== NULL
)
2656 if (external_relocs
== NULL
)
2658 bfd_size_type size
= 0;
2661 size
+= esdo
->rel
.hdr
->sh_size
;
2663 size
+= esdo
->rela
.hdr
->sh_size
;
2665 alloc1
= bfd_malloc (size
);
2668 external_relocs
= alloc1
;
2671 internal_rela_relocs
= internal_relocs
;
2674 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2678 external_relocs
= (((bfd_byte
*) external_relocs
)
2679 + esdo
->rel
.hdr
->sh_size
);
2680 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2681 * bed
->s
->int_rels_per_ext_rel
);
2685 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2687 internal_rela_relocs
)))
2690 /* Cache the results for next time, if we can. */
2692 esdo
->relocs
= internal_relocs
;
2696 /* Don't free alloc2, since if it was allocated we are passing it
2697 back (under the name of internal_relocs). */
2699 return internal_relocs
;
2706 bfd_release (abfd
, alloc2
);
2713 /* Compute the size of, and allocate space for, REL_HDR which is the
2714 section header for a section containing relocations for O. */
2717 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2718 struct bfd_elf_section_reloc_data
*reldata
)
2720 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2722 /* That allows us to calculate the size of the section. */
2723 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2725 /* The contents field must last into write_object_contents, so we
2726 allocate it with bfd_alloc rather than malloc. Also since we
2727 cannot be sure that the contents will actually be filled in,
2728 we zero the allocated space. */
2729 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2730 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2733 if (reldata
->hashes
== NULL
&& reldata
->count
)
2735 struct elf_link_hash_entry
**p
;
2737 p
= ((struct elf_link_hash_entry
**)
2738 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2742 reldata
->hashes
= p
;
2748 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2749 originated from the section given by INPUT_REL_HDR) to the
2753 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2754 asection
*input_section
,
2755 Elf_Internal_Shdr
*input_rel_hdr
,
2756 Elf_Internal_Rela
*internal_relocs
,
2757 struct elf_link_hash_entry
**rel_hash
2760 Elf_Internal_Rela
*irela
;
2761 Elf_Internal_Rela
*irelaend
;
2763 struct bfd_elf_section_reloc_data
*output_reldata
;
2764 asection
*output_section
;
2765 const struct elf_backend_data
*bed
;
2766 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2767 struct bfd_elf_section_data
*esdo
;
2769 output_section
= input_section
->output_section
;
2771 bed
= get_elf_backend_data (output_bfd
);
2772 esdo
= elf_section_data (output_section
);
2773 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2775 output_reldata
= &esdo
->rel
;
2776 swap_out
= bed
->s
->swap_reloc_out
;
2778 else if (esdo
->rela
.hdr
2779 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2781 output_reldata
= &esdo
->rela
;
2782 swap_out
= bed
->s
->swap_reloca_out
;
2787 /* xgettext:c-format */
2788 (_("%pB: relocation size mismatch in %pB section %pA"),
2789 output_bfd
, input_section
->owner
, input_section
);
2790 bfd_set_error (bfd_error_wrong_format
);
2794 erel
= output_reldata
->hdr
->contents
;
2795 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2796 irela
= internal_relocs
;
2797 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2798 * bed
->s
->int_rels_per_ext_rel
);
2799 while (irela
< irelaend
)
2801 (*swap_out
) (output_bfd
, irela
, erel
);
2802 irela
+= bed
->s
->int_rels_per_ext_rel
;
2803 erel
+= input_rel_hdr
->sh_entsize
;
2806 /* Bump the counter, so that we know where to add the next set of
2808 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2813 /* Make weak undefined symbols in PIE dynamic. */
2816 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2817 struct elf_link_hash_entry
*h
)
2819 if (bfd_link_pie (info
)
2821 && h
->root
.type
== bfd_link_hash_undefweak
)
2822 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2827 /* Fix up the flags for a symbol. This handles various cases which
2828 can only be fixed after all the input files are seen. This is
2829 currently called by both adjust_dynamic_symbol and
2830 assign_sym_version, which is unnecessary but perhaps more robust in
2831 the face of future changes. */
2834 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2835 struct elf_info_failed
*eif
)
2837 const struct elf_backend_data
*bed
;
2839 /* If this symbol was mentioned in a non-ELF file, try to set
2840 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2841 permit a non-ELF file to correctly refer to a symbol defined in
2842 an ELF dynamic object. */
2845 while (h
->root
.type
== bfd_link_hash_indirect
)
2846 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2848 if (h
->root
.type
!= bfd_link_hash_defined
2849 && h
->root
.type
!= bfd_link_hash_defweak
)
2852 h
->ref_regular_nonweak
= 1;
2856 if (h
->root
.u
.def
.section
->owner
!= NULL
2857 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2858 == bfd_target_elf_flavour
))
2861 h
->ref_regular_nonweak
= 1;
2867 if (h
->dynindx
== -1
2871 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2880 /* Unfortunately, NON_ELF is only correct if the symbol
2881 was first seen in a non-ELF file. Fortunately, if the symbol
2882 was first seen in an ELF file, we're probably OK unless the
2883 symbol was defined in a non-ELF file. Catch that case here.
2884 FIXME: We're still in trouble if the symbol was first seen in
2885 a dynamic object, and then later in a non-ELF regular object. */
2886 if ((h
->root
.type
== bfd_link_hash_defined
2887 || h
->root
.type
== bfd_link_hash_defweak
)
2889 && (h
->root
.u
.def
.section
->owner
!= NULL
2890 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2891 != bfd_target_elf_flavour
)
2892 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2893 && !h
->def_dynamic
)))
2897 /* Backend specific symbol fixup. */
2898 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2899 if (bed
->elf_backend_fixup_symbol
2900 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2903 /* If this is a final link, and the symbol was defined as a common
2904 symbol in a regular object file, and there was no definition in
2905 any dynamic object, then the linker will have allocated space for
2906 the symbol in a common section but the DEF_REGULAR
2907 flag will not have been set. */
2908 if (h
->root
.type
== bfd_link_hash_defined
2912 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2915 /* Symbols defined in discarded sections shouldn't be dynamic. */
2916 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2917 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2919 /* If a weak undefined symbol has non-default visibility, we also
2920 hide it from the dynamic linker. */
2921 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2922 && h
->root
.type
== bfd_link_hash_undefweak
)
2923 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2925 /* A hidden versioned symbol in executable should be forced local if
2926 it is is locally defined, not referenced by shared library and not
2928 else if (bfd_link_executable (eif
->info
)
2929 && h
->versioned
== versioned_hidden
2930 && !eif
->info
->export_dynamic
2934 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2936 /* If -Bsymbolic was used (which means to bind references to global
2937 symbols to the definition within the shared object), and this
2938 symbol was defined in a regular object, then it actually doesn't
2939 need a PLT entry. Likewise, if the symbol has non-default
2940 visibility. If the symbol has hidden or internal visibility, we
2941 will force it local. */
2942 else if (h
->needs_plt
2943 && bfd_link_pic (eif
->info
)
2944 && is_elf_hash_table (eif
->info
->hash
)
2945 && (SYMBOLIC_BIND (eif
->info
, h
)
2946 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2951 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2952 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2953 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2956 /* If this is a weak defined symbol in a dynamic object, and we know
2957 the real definition in the dynamic object, copy interesting flags
2958 over to the real definition. */
2959 if (h
->is_weakalias
)
2961 struct elf_link_hash_entry
*def
= weakdef (h
);
2963 /* If the real definition is defined by a regular object file,
2964 don't do anything special. See the longer description in
2965 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2966 bfd_link_hash_defined as it was when put on the alias list
2967 then it must have originally been a versioned symbol (for
2968 which a non-versioned indirect symbol is created) and later
2969 a definition for the non-versioned symbol is found. In that
2970 case the indirection is flipped with the versioned symbol
2971 becoming an indirect pointing at the non-versioned symbol.
2972 Thus, not an alias any more. */
2973 if (def
->def_regular
2974 || def
->root
.type
!= bfd_link_hash_defined
)
2977 while ((h
= h
->u
.alias
) != def
)
2978 h
->is_weakalias
= 0;
2982 while (h
->root
.type
== bfd_link_hash_indirect
)
2983 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2984 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2985 || h
->root
.type
== bfd_link_hash_defweak
);
2986 BFD_ASSERT (def
->def_dynamic
);
2987 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2994 /* Make the backend pick a good value for a dynamic symbol. This is
2995 called via elf_link_hash_traverse, and also calls itself
2999 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
3001 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3002 struct elf_link_hash_table
*htab
;
3003 const struct elf_backend_data
*bed
;
3005 if (! is_elf_hash_table (eif
->info
->hash
))
3008 /* Ignore indirect symbols. These are added by the versioning code. */
3009 if (h
->root
.type
== bfd_link_hash_indirect
)
3012 /* Fix the symbol flags. */
3013 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
3016 htab
= elf_hash_table (eif
->info
);
3017 bed
= get_elf_backend_data (htab
->dynobj
);
3019 if (h
->root
.type
== bfd_link_hash_undefweak
)
3021 if (eif
->info
->dynamic_undefined_weak
== 0)
3022 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3023 else if (eif
->info
->dynamic_undefined_weak
> 0
3025 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3026 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
3027 h
->root
.root
.string
))
3029 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3037 /* If this symbol does not require a PLT entry, and it is not
3038 defined by a dynamic object, or is not referenced by a regular
3039 object, ignore it. We do have to handle a weak defined symbol,
3040 even if no regular object refers to it, if we decided to add it
3041 to the dynamic symbol table. FIXME: Do we normally need to worry
3042 about symbols which are defined by one dynamic object and
3043 referenced by another one? */
3045 && h
->type
!= STT_GNU_IFUNC
3049 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3051 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3055 /* If we've already adjusted this symbol, don't do it again. This
3056 can happen via a recursive call. */
3057 if (h
->dynamic_adjusted
)
3060 /* Don't look at this symbol again. Note that we must set this
3061 after checking the above conditions, because we may look at a
3062 symbol once, decide not to do anything, and then get called
3063 recursively later after REF_REGULAR is set below. */
3064 h
->dynamic_adjusted
= 1;
3066 /* If this is a weak definition, and we know a real definition, and
3067 the real symbol is not itself defined by a regular object file,
3068 then get a good value for the real definition. We handle the
3069 real symbol first, for the convenience of the backend routine.
3071 Note that there is a confusing case here. If the real definition
3072 is defined by a regular object file, we don't get the real symbol
3073 from the dynamic object, but we do get the weak symbol. If the
3074 processor backend uses a COPY reloc, then if some routine in the
3075 dynamic object changes the real symbol, we will not see that
3076 change in the corresponding weak symbol. This is the way other
3077 ELF linkers work as well, and seems to be a result of the shared
3080 I will clarify this issue. Most SVR4 shared libraries define the
3081 variable _timezone and define timezone as a weak synonym. The
3082 tzset call changes _timezone. If you write
3083 extern int timezone;
3085 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3086 you might expect that, since timezone is a synonym for _timezone,
3087 the same number will print both times. However, if the processor
3088 backend uses a COPY reloc, then actually timezone will be copied
3089 into your process image, and, since you define _timezone
3090 yourself, _timezone will not. Thus timezone and _timezone will
3091 wind up at different memory locations. The tzset call will set
3092 _timezone, leaving timezone unchanged. */
3094 if (h
->is_weakalias
)
3096 struct elf_link_hash_entry
*def
= weakdef (h
);
3098 /* If we get to this point, there is an implicit reference to
3099 the alias by a regular object file via the weak symbol H. */
3100 def
->ref_regular
= 1;
3102 /* Ensure that the backend adjust_dynamic_symbol function sees
3103 the strong alias before H by recursively calling ourselves. */
3104 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3108 /* If a symbol has no type and no size and does not require a PLT
3109 entry, then we are probably about to do the wrong thing here: we
3110 are probably going to create a COPY reloc for an empty object.
3111 This case can arise when a shared object is built with assembly
3112 code, and the assembly code fails to set the symbol type. */
3114 && h
->type
== STT_NOTYPE
3117 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3118 h
->root
.root
.string
);
3120 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3129 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3133 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3134 struct elf_link_hash_entry
*h
,
3137 unsigned int power_of_two
;
3139 asection
*sec
= h
->root
.u
.def
.section
;
3141 /* The section alignment of the definition is the maximum alignment
3142 requirement of symbols defined in the section. Since we don't
3143 know the symbol alignment requirement, we start with the
3144 maximum alignment and check low bits of the symbol address
3145 for the minimum alignment. */
3146 power_of_two
= bfd_section_alignment (sec
);
3147 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3148 while ((h
->root
.u
.def
.value
& mask
) != 0)
3154 if (power_of_two
> bfd_section_alignment (dynbss
))
3156 /* Adjust the section alignment if needed. */
3157 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3161 /* We make sure that the symbol will be aligned properly. */
3162 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3164 /* Define the symbol as being at this point in DYNBSS. */
3165 h
->root
.u
.def
.section
= dynbss
;
3166 h
->root
.u
.def
.value
= dynbss
->size
;
3168 /* Increment the size of DYNBSS to make room for the symbol. */
3169 dynbss
->size
+= h
->size
;
3171 /* No error if extern_protected_data is true. */
3172 if (h
->protected_def
3173 && (!info
->extern_protected_data
3174 || (info
->extern_protected_data
< 0
3175 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3176 info
->callbacks
->einfo
3177 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3178 h
->root
.root
.string
);
3183 /* Adjust all external symbols pointing into SEC_MERGE sections
3184 to reflect the object merging within the sections. */
3187 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3191 if ((h
->root
.type
== bfd_link_hash_defined
3192 || h
->root
.type
== bfd_link_hash_defweak
)
3193 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3194 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3196 bfd
*output_bfd
= (bfd
*) data
;
3198 h
->root
.u
.def
.value
=
3199 _bfd_merged_section_offset (output_bfd
,
3200 &h
->root
.u
.def
.section
,
3201 elf_section_data (sec
)->sec_info
,
3202 h
->root
.u
.def
.value
);
3208 /* Returns false if the symbol referred to by H should be considered
3209 to resolve local to the current module, and true if it should be
3210 considered to bind dynamically. */
3213 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3214 struct bfd_link_info
*info
,
3215 bool not_local_protected
)
3217 bool binding_stays_local_p
;
3218 const struct elf_backend_data
*bed
;
3219 struct elf_link_hash_table
*hash_table
;
3224 while (h
->root
.type
== bfd_link_hash_indirect
3225 || h
->root
.type
== bfd_link_hash_warning
)
3226 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3228 /* If it was forced local, then clearly it's not dynamic. */
3229 if (h
->dynindx
== -1)
3231 if (h
->forced_local
)
3234 /* Identify the cases where name binding rules say that a
3235 visible symbol resolves locally. */
3236 binding_stays_local_p
= (bfd_link_executable (info
)
3237 || SYMBOLIC_BIND (info
, h
));
3239 switch (ELF_ST_VISIBILITY (h
->other
))
3246 hash_table
= elf_hash_table (info
);
3247 if (!is_elf_hash_table (&hash_table
->root
))
3250 bed
= get_elf_backend_data (hash_table
->dynobj
);
3252 /* Proper resolution for function pointer equality may require
3253 that these symbols perhaps be resolved dynamically, even though
3254 we should be resolving them to the current module. */
3255 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3256 binding_stays_local_p
= true;
3263 /* If it isn't defined locally, then clearly it's dynamic. */
3264 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3267 /* Otherwise, the symbol is dynamic if binding rules don't tell
3268 us that it remains local. */
3269 return !binding_stays_local_p
;
3272 /* Return true if the symbol referred to by H should be considered
3273 to resolve local to the current module, and false otherwise. Differs
3274 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3275 undefined symbols. The two functions are virtually identical except
3276 for the place where dynindx == -1 is tested. If that test is true,
3277 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3278 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3280 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3281 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3282 treatment of undefined weak symbols. For those that do not make
3283 undefined weak symbols dynamic, both functions may return false. */
3286 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3287 struct bfd_link_info
*info
,
3288 bool local_protected
)
3290 const struct elf_backend_data
*bed
;
3291 struct elf_link_hash_table
*hash_table
;
3293 /* If it's a local sym, of course we resolve locally. */
3297 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3298 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3299 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3302 /* Forced local symbols resolve locally. */
3303 if (h
->forced_local
)
3306 /* Common symbols that become definitions don't get the DEF_REGULAR
3307 flag set, so test it first, and don't bail out. */
3308 if (ELF_COMMON_DEF_P (h
))
3310 /* If we don't have a definition in a regular file, then we can't
3311 resolve locally. The sym is either undefined or dynamic. */
3312 else if (!h
->def_regular
)
3315 /* Non-dynamic symbols resolve locally. */
3316 if (h
->dynindx
== -1)
3319 /* At this point, we know the symbol is defined and dynamic. In an
3320 executable it must resolve locally, likewise when building symbolic
3321 shared libraries. */
3322 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3325 /* Now deal with defined dynamic symbols in shared libraries. Ones
3326 with default visibility might not resolve locally. */
3327 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3330 hash_table
= elf_hash_table (info
);
3331 if (!is_elf_hash_table (&hash_table
->root
))
3334 bed
= get_elf_backend_data (hash_table
->dynobj
);
3336 /* If extern_protected_data is false, STV_PROTECTED non-function
3337 symbols are local. */
3338 if ((!info
->extern_protected_data
3339 || (info
->extern_protected_data
< 0
3340 && !bed
->extern_protected_data
))
3341 && !bed
->is_function_type (h
->type
))
3344 /* Function pointer equality tests may require that STV_PROTECTED
3345 symbols be treated as dynamic symbols. If the address of a
3346 function not defined in an executable is set to that function's
3347 plt entry in the executable, then the address of the function in
3348 a shared library must also be the plt entry in the executable. */
3349 return local_protected
;
3352 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3353 aligned. Returns the first TLS output section. */
3355 struct bfd_section
*
3356 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3358 struct bfd_section
*sec
, *tls
;
3359 unsigned int align
= 0;
3361 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3362 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3366 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3367 if (sec
->alignment_power
> align
)
3368 align
= sec
->alignment_power
;
3370 elf_hash_table (info
)->tls_sec
= tls
;
3372 /* Ensure the alignment of the first section (usually .tdata) is the largest
3373 alignment, so that the tls segment starts aligned. */
3375 tls
->alignment_power
= align
;
3380 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3382 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3383 Elf_Internal_Sym
*sym
)
3385 const struct elf_backend_data
*bed
;
3387 /* Local symbols do not count, but target specific ones might. */
3388 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3389 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3392 bed
= get_elf_backend_data (abfd
);
3393 /* Function symbols do not count. */
3394 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3397 /* If the section is undefined, then so is the symbol. */
3398 if (sym
->st_shndx
== SHN_UNDEF
)
3401 /* If the symbol is defined in the common section, then
3402 it is a common definition and so does not count. */
3403 if (bed
->common_definition (sym
))
3406 /* If the symbol is in a target specific section then we
3407 must rely upon the backend to tell us what it is. */
3408 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3409 /* FIXME - this function is not coded yet:
3411 return _bfd_is_global_symbol_definition (abfd, sym);
3413 Instead for now assume that the definition is not global,
3414 Even if this is wrong, at least the linker will behave
3415 in the same way that it used to do. */
3421 /* Search the symbol table of the archive element of the archive ABFD
3422 whose archive map contains a mention of SYMDEF, and determine if
3423 the symbol is defined in this element. */
3425 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3427 Elf_Internal_Shdr
* hdr
;
3431 Elf_Internal_Sym
*isymbuf
;
3432 Elf_Internal_Sym
*isym
;
3433 Elf_Internal_Sym
*isymend
;
3436 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3440 if (! bfd_check_format (abfd
, bfd_object
))
3443 /* Select the appropriate symbol table. If we don't know if the
3444 object file is an IR object, give linker LTO plugin a chance to
3445 get the correct symbol table. */
3446 if (abfd
->plugin_format
== bfd_plugin_yes
3447 #if BFD_SUPPORTS_PLUGINS
3448 || (abfd
->plugin_format
== bfd_plugin_unknown
3449 && bfd_link_plugin_object_p (abfd
))
3453 /* Use the IR symbol table if the object has been claimed by
3455 abfd
= abfd
->plugin_dummy_bfd
;
3456 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3458 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3459 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3461 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3463 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3465 /* The sh_info field of the symtab header tells us where the
3466 external symbols start. We don't care about the local symbols. */
3467 if (elf_bad_symtab (abfd
))
3469 extsymcount
= symcount
;
3474 extsymcount
= symcount
- hdr
->sh_info
;
3475 extsymoff
= hdr
->sh_info
;
3478 if (extsymcount
== 0)
3481 /* Read in the symbol table. */
3482 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3484 if (isymbuf
== NULL
)
3487 /* Scan the symbol table looking for SYMDEF. */
3489 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3493 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3498 if (strcmp (name
, symdef
->name
) == 0)
3500 result
= is_global_data_symbol_definition (abfd
, isym
);
3510 /* Add an entry to the .dynamic table. */
3513 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3517 struct elf_link_hash_table
*hash_table
;
3518 const struct elf_backend_data
*bed
;
3520 bfd_size_type newsize
;
3521 bfd_byte
*newcontents
;
3522 Elf_Internal_Dyn dyn
;
3524 hash_table
= elf_hash_table (info
);
3525 if (! is_elf_hash_table (&hash_table
->root
))
3528 if (tag
== DT_RELA
|| tag
== DT_REL
)
3529 hash_table
->dynamic_relocs
= true;
3531 bed
= get_elf_backend_data (hash_table
->dynobj
);
3532 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3533 BFD_ASSERT (s
!= NULL
);
3535 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3536 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3537 if (newcontents
== NULL
)
3541 dyn
.d_un
.d_val
= val
;
3542 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3545 s
->contents
= newcontents
;
3550 /* Strip zero-sized dynamic sections. */
3553 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3555 struct elf_link_hash_table
*hash_table
;
3556 const struct elf_backend_data
*bed
;
3557 asection
*s
, *sdynamic
, **pp
;
3558 asection
*rela_dyn
, *rel_dyn
;
3559 Elf_Internal_Dyn dyn
;
3560 bfd_byte
*extdyn
, *next
;
3561 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3562 bool strip_zero_sized
;
3563 bool strip_zero_sized_plt
;
3565 if (bfd_link_relocatable (info
))
3568 hash_table
= elf_hash_table (info
);
3569 if (!is_elf_hash_table (&hash_table
->root
))
3572 if (!hash_table
->dynobj
)
3575 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3579 bed
= get_elf_backend_data (hash_table
->dynobj
);
3580 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3582 strip_zero_sized
= false;
3583 strip_zero_sized_plt
= false;
3585 /* Strip zero-sized dynamic sections. */
3586 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3587 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3588 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3592 || s
== hash_table
->srelplt
->output_section
3593 || s
== hash_table
->splt
->output_section
))
3596 info
->output_bfd
->section_count
--;
3597 strip_zero_sized
= true;
3602 else if (s
== hash_table
->splt
->output_section
)
3604 s
= hash_table
->splt
;
3605 strip_zero_sized_plt
= true;
3608 s
= hash_table
->srelplt
;
3609 s
->flags
|= SEC_EXCLUDE
;
3610 s
->output_section
= bfd_abs_section_ptr
;
3615 if (strip_zero_sized_plt
)
3616 for (extdyn
= sdynamic
->contents
;
3617 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3620 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3621 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3629 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3630 the procedure linkage table (the .plt section) has been
3632 memmove (extdyn
, next
,
3633 sdynamic
->size
- (next
- sdynamic
->contents
));
3638 if (strip_zero_sized
)
3640 /* Regenerate program headers. */
3641 elf_seg_map (info
->output_bfd
) = NULL
;
3642 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
);
3648 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3649 1 if a DT_NEEDED tag already exists, and 0 on success. */
3652 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3654 struct elf_link_hash_table
*hash_table
;
3658 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3661 hash_table
= elf_hash_table (info
);
3662 soname
= elf_dt_name (abfd
);
3663 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, false);
3664 if (strindex
== (size_t) -1)
3667 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3670 const struct elf_backend_data
*bed
;
3673 bed
= get_elf_backend_data (hash_table
->dynobj
);
3674 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3676 for (extdyn
= sdyn
->contents
;
3677 extdyn
< sdyn
->contents
+ sdyn
->size
;
3678 extdyn
+= bed
->s
->sizeof_dyn
)
3680 Elf_Internal_Dyn dyn
;
3682 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3683 if (dyn
.d_tag
== DT_NEEDED
3684 && dyn
.d_un
.d_val
== strindex
)
3686 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3692 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3695 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3701 /* Return true if SONAME is on the needed list between NEEDED and STOP
3702 (or the end of list if STOP is NULL), and needed by a library that
3706 on_needed_list (const char *soname
,
3707 struct bfd_link_needed_list
*needed
,
3708 struct bfd_link_needed_list
*stop
)
3710 struct bfd_link_needed_list
*look
;
3711 for (look
= needed
; look
!= stop
; look
= look
->next
)
3712 if (strcmp (soname
, look
->name
) == 0
3713 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3714 /* If needed by a library that itself is not directly
3715 needed, recursively check whether that library is
3716 indirectly needed. Since we add DT_NEEDED entries to
3717 the end of the list, library dependencies appear after
3718 the library. Therefore search prior to the current
3719 LOOK, preventing possible infinite recursion. */
3720 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3726 /* Sort symbol by value, section, size, and type. */
3728 elf_sort_symbol (const void *arg1
, const void *arg2
)
3730 const struct elf_link_hash_entry
*h1
;
3731 const struct elf_link_hash_entry
*h2
;
3732 bfd_signed_vma vdiff
;
3737 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3738 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3739 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3741 return vdiff
> 0 ? 1 : -1;
3743 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3747 /* Sort so that sized symbols are selected over zero size symbols. */
3748 vdiff
= h1
->size
- h2
->size
;
3750 return vdiff
> 0 ? 1 : -1;
3752 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3753 if (h1
->type
!= h2
->type
)
3754 return h1
->type
- h2
->type
;
3756 /* If symbols are properly sized and typed, and multiple strong
3757 aliases are not defined in a shared library by the user we
3758 shouldn't get here. Unfortunately linker script symbols like
3759 __bss_start sometimes match a user symbol defined at the start of
3760 .bss without proper size and type. We'd like to preference the
3761 user symbol over reserved system symbols. Sort on leading
3763 n1
= h1
->root
.root
.string
;
3764 n2
= h2
->root
.root
.string
;
3777 /* Final sort on name selects user symbols like '_u' over reserved
3778 system symbols like '_Z' and also will avoid qsort instability. */
3782 /* This function is used to adjust offsets into .dynstr for
3783 dynamic symbols. This is called via elf_link_hash_traverse. */
3786 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3788 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3790 if (h
->dynindx
!= -1)
3791 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3795 /* Assign string offsets in .dynstr, update all structures referencing
3799 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3801 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3802 struct elf_link_local_dynamic_entry
*entry
;
3803 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3804 bfd
*dynobj
= hash_table
->dynobj
;
3807 const struct elf_backend_data
*bed
;
3810 _bfd_elf_strtab_finalize (dynstr
);
3811 size
= _bfd_elf_strtab_size (dynstr
);
3813 /* Allow the linker to examine the dynsymtab now it's fully populated. */
3815 if (info
->callbacks
->examine_strtab
)
3816 info
->callbacks
->examine_strtab (dynstr
);
3818 bed
= get_elf_backend_data (dynobj
);
3819 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3820 BFD_ASSERT (sdyn
!= NULL
);
3822 /* Update all .dynamic entries referencing .dynstr strings. */
3823 for (extdyn
= sdyn
->contents
;
3824 extdyn
< sdyn
->contents
+ sdyn
->size
;
3825 extdyn
+= bed
->s
->sizeof_dyn
)
3827 Elf_Internal_Dyn dyn
;
3829 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3833 dyn
.d_un
.d_val
= size
;
3843 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3848 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3851 /* Now update local dynamic symbols. */
3852 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3853 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3854 entry
->isym
.st_name
);
3856 /* And the rest of dynamic symbols. */
3857 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3859 /* Adjust version definitions. */
3860 if (elf_tdata (output_bfd
)->cverdefs
)
3865 Elf_Internal_Verdef def
;
3866 Elf_Internal_Verdaux defaux
;
3868 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3872 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3874 p
+= sizeof (Elf_External_Verdef
);
3875 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3877 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3879 _bfd_elf_swap_verdaux_in (output_bfd
,
3880 (Elf_External_Verdaux
*) p
, &defaux
);
3881 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3883 _bfd_elf_swap_verdaux_out (output_bfd
,
3884 &defaux
, (Elf_External_Verdaux
*) p
);
3885 p
+= sizeof (Elf_External_Verdaux
);
3888 while (def
.vd_next
);
3891 /* Adjust version references. */
3892 if (elf_tdata (output_bfd
)->verref
)
3897 Elf_Internal_Verneed need
;
3898 Elf_Internal_Vernaux needaux
;
3900 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3904 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3906 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3907 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3908 (Elf_External_Verneed
*) p
);
3909 p
+= sizeof (Elf_External_Verneed
);
3910 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3912 _bfd_elf_swap_vernaux_in (output_bfd
,
3913 (Elf_External_Vernaux
*) p
, &needaux
);
3914 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3916 _bfd_elf_swap_vernaux_out (output_bfd
,
3918 (Elf_External_Vernaux
*) p
);
3919 p
+= sizeof (Elf_External_Vernaux
);
3922 while (need
.vn_next
);
3928 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3929 The default is to only match when the INPUT and OUTPUT are exactly
3933 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3934 const bfd_target
*output
)
3936 return input
== output
;
3939 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3940 This version is used when different targets for the same architecture
3941 are virtually identical. */
3944 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3945 const bfd_target
*output
)
3947 const struct elf_backend_data
*obed
, *ibed
;
3949 if (input
== output
)
3952 ibed
= xvec_get_elf_backend_data (input
);
3953 obed
= xvec_get_elf_backend_data (output
);
3955 if (ibed
->arch
!= obed
->arch
)
3958 /* If both backends are using this function, deem them compatible. */
3959 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3962 /* Make a special call to the linker "notice" function to tell it that
3963 we are about to handle an as-needed lib, or have finished
3964 processing the lib. */
3967 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3968 struct bfd_link_info
*info
,
3969 enum notice_asneeded_action act
)
3971 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3974 /* Check relocations an ELF object file. */
3977 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3979 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3980 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3982 /* If this object is the same format as the output object, and it is
3983 not a shared library, then let the backend look through the
3986 This is required to build global offset table entries and to
3987 arrange for dynamic relocs. It is not required for the
3988 particular common case of linking non PIC code, even when linking
3989 against shared libraries, but unfortunately there is no way of
3990 knowing whether an object file has been compiled PIC or not.
3991 Looking through the relocs is not particularly time consuming.
3992 The problem is that we must either (1) keep the relocs in memory,
3993 which causes the linker to require additional runtime memory or
3994 (2) read the relocs twice from the input file, which wastes time.
3995 This would be a good case for using mmap.
3997 I have no idea how to handle linking PIC code into a file of a
3998 different format. It probably can't be done. */
3999 if ((abfd
->flags
& DYNAMIC
) == 0
4000 && is_elf_hash_table (&htab
->root
)
4001 && bed
->check_relocs
!= NULL
4002 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4003 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4007 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4009 Elf_Internal_Rela
*internal_relocs
;
4012 /* Don't check relocations in excluded sections. Don't do
4013 anything special with non-loaded, non-alloced sections.
4014 In particular, any relocs in such sections should not
4015 affect GOT and PLT reference counting (ie. we don't
4016 allow them to create GOT or PLT entries), there's no
4017 possibility or desire to optimize TLS relocs, and
4018 there's not much point in propagating relocs to shared
4019 libs that the dynamic linker won't relocate. */
4020 if ((o
->flags
& SEC_ALLOC
) == 0
4021 || (o
->flags
& SEC_RELOC
) == 0
4022 || (o
->flags
& SEC_EXCLUDE
) != 0
4023 || o
->reloc_count
== 0
4024 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4025 && (o
->flags
& SEC_DEBUGGING
) != 0)
4026 || bfd_is_abs_section (o
->output_section
))
4029 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4031 if (internal_relocs
== NULL
)
4034 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4036 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4037 free (internal_relocs
);
4047 /* Add symbols from an ELF object file to the linker hash table. */
4050 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4052 Elf_Internal_Ehdr
*ehdr
;
4053 Elf_Internal_Shdr
*hdr
;
4057 struct elf_link_hash_entry
**sym_hash
;
4059 Elf_External_Versym
*extversym
= NULL
;
4060 Elf_External_Versym
*extversym_end
= NULL
;
4061 Elf_External_Versym
*ever
;
4062 struct elf_link_hash_entry
*weaks
;
4063 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4064 size_t nondeflt_vers_cnt
= 0;
4065 Elf_Internal_Sym
*isymbuf
= NULL
;
4066 Elf_Internal_Sym
*isym
;
4067 Elf_Internal_Sym
*isymend
;
4068 const struct elf_backend_data
*bed
;
4070 struct elf_link_hash_table
*htab
;
4071 void *alloc_mark
= NULL
;
4072 struct bfd_hash_entry
**old_table
= NULL
;
4073 unsigned int old_size
= 0;
4074 unsigned int old_count
= 0;
4075 void *old_tab
= NULL
;
4077 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4078 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4079 void *old_strtab
= NULL
;
4084 htab
= elf_hash_table (info
);
4085 bed
= get_elf_backend_data (abfd
);
4087 if ((abfd
->flags
& DYNAMIC
) == 0)
4093 /* You can't use -r against a dynamic object. Also, there's no
4094 hope of using a dynamic object which does not exactly match
4095 the format of the output file. */
4096 if (bfd_link_relocatable (info
)
4097 || !is_elf_hash_table (&htab
->root
)
4098 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4100 if (bfd_link_relocatable (info
))
4101 bfd_set_error (bfd_error_invalid_operation
);
4103 bfd_set_error (bfd_error_wrong_format
);
4108 ehdr
= elf_elfheader (abfd
);
4109 if (info
->warn_alternate_em
4110 && bed
->elf_machine_code
!= ehdr
->e_machine
4111 && ((bed
->elf_machine_alt1
!= 0
4112 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4113 || (bed
->elf_machine_alt2
!= 0
4114 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4116 /* xgettext:c-format */
4117 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4118 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4120 /* As a GNU extension, any input sections which are named
4121 .gnu.warning.SYMBOL are treated as warning symbols for the given
4122 symbol. This differs from .gnu.warning sections, which generate
4123 warnings when they are included in an output file. */
4124 /* PR 12761: Also generate this warning when building shared libraries. */
4125 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4129 name
= bfd_section_name (s
);
4130 if (startswith (name
, ".gnu.warning."))
4135 name
+= sizeof ".gnu.warning." - 1;
4137 /* If this is a shared object, then look up the symbol
4138 in the hash table. If it is there, and it is already
4139 been defined, then we will not be using the entry
4140 from this shared object, so we don't need to warn.
4141 FIXME: If we see the definition in a regular object
4142 later on, we will warn, but we shouldn't. The only
4143 fix is to keep track of what warnings we are supposed
4144 to emit, and then handle them all at the end of the
4148 struct elf_link_hash_entry
*h
;
4150 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
4152 /* FIXME: What about bfd_link_hash_common? */
4154 && (h
->root
.type
== bfd_link_hash_defined
4155 || h
->root
.type
== bfd_link_hash_defweak
))
4160 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4164 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4169 if (! (_bfd_generic_link_add_one_symbol
4170 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4171 false, bed
->collect
, NULL
)))
4174 if (bfd_link_executable (info
))
4176 /* Clobber the section size so that the warning does
4177 not get copied into the output file. */
4180 /* Also set SEC_EXCLUDE, so that symbols defined in
4181 the warning section don't get copied to the output. */
4182 s
->flags
|= SEC_EXCLUDE
;
4187 just_syms
= ((s
= abfd
->sections
) != NULL
4188 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4193 /* If we are creating a shared library, create all the dynamic
4194 sections immediately. We need to attach them to something,
4195 so we attach them to this BFD, provided it is the right
4196 format and is not from ld --just-symbols. Always create the
4197 dynamic sections for -E/--dynamic-list. FIXME: If there
4198 are no input BFD's of the same format as the output, we can't
4199 make a shared library. */
4201 && (bfd_link_pic (info
)
4202 || (!bfd_link_relocatable (info
)
4204 && (info
->export_dynamic
|| info
->dynamic
)))
4205 && is_elf_hash_table (&htab
->root
)
4206 && info
->output_bfd
->xvec
== abfd
->xvec
4207 && !htab
->dynamic_sections_created
)
4209 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4213 else if (!is_elf_hash_table (&htab
->root
))
4217 const char *soname
= NULL
;
4219 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4220 const Elf_Internal_Phdr
*phdr
;
4221 struct elf_link_loaded_list
*loaded_lib
;
4223 /* ld --just-symbols and dynamic objects don't mix very well.
4224 ld shouldn't allow it. */
4228 /* If this dynamic lib was specified on the command line with
4229 --as-needed in effect, then we don't want to add a DT_NEEDED
4230 tag unless the lib is actually used. Similary for libs brought
4231 in by another lib's DT_NEEDED. When --no-add-needed is used
4232 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4233 any dynamic library in DT_NEEDED tags in the dynamic lib at
4235 add_needed
= (elf_dyn_lib_class (abfd
)
4236 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4237 | DYN_NO_NEEDED
)) == 0;
4239 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4244 unsigned int elfsec
;
4245 unsigned long shlink
;
4247 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4254 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4255 if (elfsec
== SHN_BAD
)
4256 goto error_free_dyn
;
4257 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4259 for (extdyn
= dynbuf
;
4260 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4261 extdyn
+= bed
->s
->sizeof_dyn
)
4263 Elf_Internal_Dyn dyn
;
4265 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4266 if (dyn
.d_tag
== DT_SONAME
)
4268 unsigned int tagv
= dyn
.d_un
.d_val
;
4269 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4271 goto error_free_dyn
;
4273 if (dyn
.d_tag
== DT_NEEDED
)
4275 struct bfd_link_needed_list
*n
, **pn
;
4277 unsigned int tagv
= dyn
.d_un
.d_val
;
4278 size_t amt
= sizeof (struct bfd_link_needed_list
);
4280 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4281 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4282 if (n
== NULL
|| fnm
== NULL
)
4283 goto error_free_dyn
;
4284 amt
= strlen (fnm
) + 1;
4285 anm
= (char *) bfd_alloc (abfd
, amt
);
4287 goto error_free_dyn
;
4288 memcpy (anm
, fnm
, amt
);
4292 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4296 if (dyn
.d_tag
== DT_RUNPATH
)
4298 struct bfd_link_needed_list
*n
, **pn
;
4300 unsigned int tagv
= dyn
.d_un
.d_val
;
4301 size_t amt
= sizeof (struct bfd_link_needed_list
);
4303 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4304 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4305 if (n
== NULL
|| fnm
== NULL
)
4306 goto error_free_dyn
;
4307 amt
= strlen (fnm
) + 1;
4308 anm
= (char *) bfd_alloc (abfd
, amt
);
4310 goto error_free_dyn
;
4311 memcpy (anm
, fnm
, amt
);
4315 for (pn
= & runpath
;
4321 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4322 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4324 struct bfd_link_needed_list
*n
, **pn
;
4326 unsigned int tagv
= dyn
.d_un
.d_val
;
4327 size_t amt
= sizeof (struct bfd_link_needed_list
);
4329 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4330 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4331 if (n
== NULL
|| fnm
== NULL
)
4332 goto error_free_dyn
;
4333 amt
= strlen (fnm
) + 1;
4334 anm
= (char *) bfd_alloc (abfd
, amt
);
4336 goto error_free_dyn
;
4337 memcpy (anm
, fnm
, amt
);
4347 if (dyn
.d_tag
== DT_AUDIT
)
4349 unsigned int tagv
= dyn
.d_un
.d_val
;
4350 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4357 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4358 frees all more recently bfd_alloc'd blocks as well. */
4364 struct bfd_link_needed_list
**pn
;
4365 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4370 /* If we have a PT_GNU_RELRO program header, mark as read-only
4371 all sections contained fully therein. This makes relro
4372 shared library sections appear as they will at run-time. */
4373 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4374 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4375 if (phdr
->p_type
== PT_GNU_RELRO
)
4377 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4379 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4381 if ((s
->flags
& SEC_ALLOC
) != 0
4382 && s
->vma
* opb
>= phdr
->p_vaddr
4383 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4384 s
->flags
|= SEC_READONLY
;
4389 /* We do not want to include any of the sections in a dynamic
4390 object in the output file. We hack by simply clobbering the
4391 list of sections in the BFD. This could be handled more
4392 cleanly by, say, a new section flag; the existing
4393 SEC_NEVER_LOAD flag is not the one we want, because that one
4394 still implies that the section takes up space in the output
4396 bfd_section_list_clear (abfd
);
4398 /* Find the name to use in a DT_NEEDED entry that refers to this
4399 object. If the object has a DT_SONAME entry, we use it.
4400 Otherwise, if the generic linker stuck something in
4401 elf_dt_name, we use that. Otherwise, we just use the file
4403 if (soname
== NULL
|| *soname
== '\0')
4405 soname
= elf_dt_name (abfd
);
4406 if (soname
== NULL
|| *soname
== '\0')
4407 soname
= bfd_get_filename (abfd
);
4410 /* Save the SONAME because sometimes the linker emulation code
4411 will need to know it. */
4412 elf_dt_name (abfd
) = soname
;
4414 /* If we have already included this dynamic object in the
4415 link, just ignore it. There is no reason to include a
4416 particular dynamic object more than once. */
4417 for (loaded_lib
= htab
->dyn_loaded
;
4419 loaded_lib
= loaded_lib
->next
)
4421 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4425 /* Create dynamic sections for backends that require that be done
4426 before setup_gnu_properties. */
4428 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4431 /* Save the DT_AUDIT entry for the linker emulation code. */
4432 elf_dt_audit (abfd
) = audit
;
4435 /* If this is a dynamic object, we always link against the .dynsym
4436 symbol table, not the .symtab symbol table. The dynamic linker
4437 will only see the .dynsym symbol table, so there is no reason to
4438 look at .symtab for a dynamic object. */
4440 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4441 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4443 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4445 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4447 /* The sh_info field of the symtab header tells us where the
4448 external symbols start. We don't care about the local symbols at
4450 if (elf_bad_symtab (abfd
))
4452 extsymcount
= symcount
;
4457 extsymcount
= symcount
- hdr
->sh_info
;
4458 extsymoff
= hdr
->sh_info
;
4461 sym_hash
= elf_sym_hashes (abfd
);
4462 if (extsymcount
!= 0)
4464 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4466 if (isymbuf
== NULL
)
4469 if (sym_hash
== NULL
)
4471 /* We store a pointer to the hash table entry for each
4473 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4474 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4475 if (sym_hash
== NULL
)
4476 goto error_free_sym
;
4477 elf_sym_hashes (abfd
) = sym_hash
;
4483 /* Read in any version definitions. */
4484 if (!_bfd_elf_slurp_version_tables (abfd
,
4485 info
->default_imported_symver
))
4486 goto error_free_sym
;
4488 /* Read in the symbol versions, but don't bother to convert them
4489 to internal format. */
4490 if (elf_dynversym (abfd
) != 0)
4492 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4493 bfd_size_type amt
= versymhdr
->sh_size
;
4495 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4496 goto error_free_sym
;
4497 extversym
= (Elf_External_Versym
*)
4498 _bfd_malloc_and_read (abfd
, amt
, amt
);
4499 if (extversym
== NULL
)
4500 goto error_free_sym
;
4501 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4505 /* If we are loading an as-needed shared lib, save the symbol table
4506 state before we start adding symbols. If the lib turns out
4507 to be unneeded, restore the state. */
4508 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4513 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4515 struct bfd_hash_entry
*p
;
4516 struct elf_link_hash_entry
*h
;
4518 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4520 h
= (struct elf_link_hash_entry
*) p
;
4521 entsize
+= htab
->root
.table
.entsize
;
4522 if (h
->root
.type
== bfd_link_hash_warning
)
4524 entsize
+= htab
->root
.table
.entsize
;
4525 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4527 if (h
->root
.type
== bfd_link_hash_common
)
4528 entsize
+= sizeof (*h
->root
.u
.c
.p
);
4532 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4533 old_tab
= bfd_malloc (tabsize
+ entsize
);
4534 if (old_tab
== NULL
)
4535 goto error_free_vers
;
4537 /* Remember the current objalloc pointer, so that all mem for
4538 symbols added can later be reclaimed. */
4539 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4540 if (alloc_mark
== NULL
)
4541 goto error_free_vers
;
4543 /* Make a special call to the linker "notice" function to
4544 tell it that we are about to handle an as-needed lib. */
4545 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4546 goto error_free_vers
;
4548 /* Clone the symbol table. Remember some pointers into the
4549 symbol table, and dynamic symbol count. */
4550 old_ent
= (char *) old_tab
+ tabsize
;
4551 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4552 old_undefs
= htab
->root
.undefs
;
4553 old_undefs_tail
= htab
->root
.undefs_tail
;
4554 old_table
= htab
->root
.table
.table
;
4555 old_size
= htab
->root
.table
.size
;
4556 old_count
= htab
->root
.table
.count
;
4558 if (htab
->dynstr
!= NULL
)
4560 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4561 if (old_strtab
== NULL
)
4562 goto error_free_vers
;
4565 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4567 struct bfd_hash_entry
*p
;
4568 struct elf_link_hash_entry
*h
;
4570 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4572 h
= (struct elf_link_hash_entry
*) p
;
4573 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4574 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4575 if (h
->root
.type
== bfd_link_hash_warning
)
4577 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4578 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4579 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4581 if (h
->root
.type
== bfd_link_hash_common
)
4583 memcpy (old_ent
, h
->root
.u
.c
.p
, sizeof (*h
->root
.u
.c
.p
));
4584 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
4591 if (extversym
== NULL
)
4593 else if (extversym
+ extsymoff
< extversym_end
)
4594 ever
= extversym
+ extsymoff
;
4597 /* xgettext:c-format */
4598 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4599 abfd
, (long) extsymoff
,
4600 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4601 bfd_set_error (bfd_error_bad_value
);
4602 goto error_free_vers
;
4605 if (!bfd_link_relocatable (info
)
4606 && abfd
->lto_slim_object
)
4609 (_("%pB: plugin needed to handle lto object"), abfd
);
4612 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4614 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4618 asection
*sec
, *new_sec
;
4621 struct elf_link_hash_entry
*h
;
4622 struct elf_link_hash_entry
*hi
;
4624 bool size_change_ok
;
4625 bool type_change_ok
;
4631 unsigned int old_alignment
;
4632 unsigned int shindex
;
4638 flags
= BSF_NO_FLAGS
;
4640 value
= isym
->st_value
;
4641 common
= bed
->common_definition (isym
);
4642 if (common
&& info
->inhibit_common_definition
)
4644 /* Treat common symbol as undefined for --no-define-common. */
4645 isym
->st_shndx
= SHN_UNDEF
;
4650 bind
= ELF_ST_BIND (isym
->st_info
);
4654 /* This should be impossible, since ELF requires that all
4655 global symbols follow all local symbols, and that sh_info
4656 point to the first global symbol. Unfortunately, Irix 5
4658 if (elf_bad_symtab (abfd
))
4661 /* If we aren't prepared to handle locals within the globals
4662 then we'll likely segfault on a NULL symbol hash if the
4663 symbol is ever referenced in relocations. */
4664 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4665 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4666 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4667 " (>= sh_info of %lu)"),
4668 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4671 /* Dynamic object relocations are not processed by ld, so
4672 ld won't run into the problem mentioned above. */
4675 bfd_set_error (bfd_error_bad_value
);
4676 goto error_free_vers
;
4679 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4687 case STB_GNU_UNIQUE
:
4688 flags
= BSF_GNU_UNIQUE
;
4692 /* Leave it up to the processor backend. */
4696 if (isym
->st_shndx
== SHN_UNDEF
)
4697 sec
= bfd_und_section_ptr
;
4698 else if (isym
->st_shndx
== SHN_ABS
)
4699 sec
= bfd_abs_section_ptr
;
4700 else if (isym
->st_shndx
== SHN_COMMON
)
4702 sec
= bfd_com_section_ptr
;
4703 /* What ELF calls the size we call the value. What ELF
4704 calls the value we call the alignment. */
4705 value
= isym
->st_size
;
4709 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4711 sec
= bfd_abs_section_ptr
;
4712 else if (discarded_section (sec
))
4714 /* Symbols from discarded section are undefined. We keep
4716 sec
= bfd_und_section_ptr
;
4718 isym
->st_shndx
= SHN_UNDEF
;
4720 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4724 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4727 goto error_free_vers
;
4729 if (isym
->st_shndx
== SHN_COMMON
4730 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4732 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4736 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4738 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4740 goto error_free_vers
;
4744 else if (isym
->st_shndx
== SHN_COMMON
4745 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4746 && !bfd_link_relocatable (info
))
4748 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4752 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4753 | SEC_LINKER_CREATED
);
4754 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4756 goto error_free_vers
;
4760 else if (bed
->elf_add_symbol_hook
)
4762 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4764 goto error_free_vers
;
4766 /* The hook function sets the name to NULL if this symbol
4767 should be skipped for some reason. */
4772 /* Sanity check that all possibilities were handled. */
4776 /* Silently discard TLS symbols from --just-syms. There's
4777 no way to combine a static TLS block with a new TLS block
4778 for this executable. */
4779 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4780 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4783 if (bfd_is_und_section (sec
)
4784 || bfd_is_com_section (sec
))
4789 size_change_ok
= false;
4790 type_change_ok
= bed
->type_change_ok
;
4797 if (is_elf_hash_table (&htab
->root
))
4799 Elf_Internal_Versym iver
;
4800 unsigned int vernum
= 0;
4805 if (info
->default_imported_symver
)
4806 /* Use the default symbol version created earlier. */
4807 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4811 else if (ever
>= extversym_end
)
4813 /* xgettext:c-format */
4814 _bfd_error_handler (_("%pB: not enough version information"),
4816 bfd_set_error (bfd_error_bad_value
);
4817 goto error_free_vers
;
4820 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4822 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4824 /* If this is a hidden symbol, or if it is not version
4825 1, we append the version name to the symbol name.
4826 However, we do not modify a non-hidden absolute symbol
4827 if it is not a function, because it might be the version
4828 symbol itself. FIXME: What if it isn't? */
4829 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4831 && (!bfd_is_abs_section (sec
)
4832 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4835 size_t namelen
, verlen
, newlen
;
4838 if (isym
->st_shndx
!= SHN_UNDEF
)
4840 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4842 else if (vernum
> 1)
4844 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4851 /* xgettext:c-format */
4852 (_("%pB: %s: invalid version %u (max %d)"),
4854 elf_tdata (abfd
)->cverdefs
);
4855 bfd_set_error (bfd_error_bad_value
);
4856 goto error_free_vers
;
4861 /* We cannot simply test for the number of
4862 entries in the VERNEED section since the
4863 numbers for the needed versions do not start
4865 Elf_Internal_Verneed
*t
;
4868 for (t
= elf_tdata (abfd
)->verref
;
4872 Elf_Internal_Vernaux
*a
;
4874 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4876 if (a
->vna_other
== vernum
)
4878 verstr
= a
->vna_nodename
;
4888 /* xgettext:c-format */
4889 (_("%pB: %s: invalid needed version %d"),
4890 abfd
, name
, vernum
);
4891 bfd_set_error (bfd_error_bad_value
);
4892 goto error_free_vers
;
4896 namelen
= strlen (name
);
4897 verlen
= strlen (verstr
);
4898 newlen
= namelen
+ verlen
+ 2;
4899 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4900 && isym
->st_shndx
!= SHN_UNDEF
)
4903 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4904 if (newname
== NULL
)
4905 goto error_free_vers
;
4906 memcpy (newname
, name
, namelen
);
4907 p
= newname
+ namelen
;
4909 /* If this is a defined non-hidden version symbol,
4910 we add another @ to the name. This indicates the
4911 default version of the symbol. */
4912 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4913 && isym
->st_shndx
!= SHN_UNDEF
)
4915 memcpy (p
, verstr
, verlen
+ 1);
4920 /* If this symbol has default visibility and the user has
4921 requested we not re-export it, then mark it as hidden. */
4922 if (!bfd_is_und_section (sec
)
4925 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4926 isym
->st_other
= (STV_HIDDEN
4927 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4929 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4930 sym_hash
, &old_bfd
, &old_weak
,
4931 &old_alignment
, &skip
, &override
,
4932 &type_change_ok
, &size_change_ok
,
4934 goto error_free_vers
;
4939 /* Override a definition only if the new symbol matches the
4941 if (override
&& matched
)
4945 while (h
->root
.type
== bfd_link_hash_indirect
4946 || h
->root
.type
== bfd_link_hash_warning
)
4947 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4949 if (elf_tdata (abfd
)->verdef
!= NULL
4952 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4955 if (! (_bfd_generic_link_add_one_symbol
4956 (info
, override
? override
: abfd
, name
, flags
, sec
, value
,
4957 NULL
, false, bed
->collect
,
4958 (struct bfd_link_hash_entry
**) sym_hash
)))
4959 goto error_free_vers
;
4962 /* We need to make sure that indirect symbol dynamic flags are
4965 while (h
->root
.type
== bfd_link_hash_indirect
4966 || h
->root
.type
== bfd_link_hash_warning
)
4967 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. */
4973 if (discarded
&& is_elf_hash_table (&htab
->root
))
4976 new_weak
= (flags
& BSF_WEAK
) != 0;
4980 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4981 && is_elf_hash_table (&htab
->root
)
4982 && h
->u
.alias
== NULL
)
4984 /* Keep a list of all weak defined non function symbols from
4985 a dynamic object, using the alias field. Later in this
4986 function we will set the alias field to the correct
4987 value. We only put non-function symbols from dynamic
4988 objects on this list, because that happens to be the only
4989 time we need to know the normal symbol corresponding to a
4990 weak symbol, and the information is time consuming to
4991 figure out. If the alias field is not already NULL,
4992 then this symbol was already defined by some previous
4993 dynamic object, and we will be using that previous
4994 definition anyhow. */
5000 /* Set the alignment of a common symbol. */
5001 if ((common
|| bfd_is_com_section (sec
))
5002 && h
->root
.type
== bfd_link_hash_common
)
5007 align
= bfd_log2 (isym
->st_value
);
5010 /* The new symbol is a common symbol in a shared object.
5011 We need to get the alignment from the section. */
5012 align
= new_sec
->alignment_power
;
5014 if (align
> old_alignment
)
5015 h
->root
.u
.c
.p
->alignment_power
= align
;
5017 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
5020 if (is_elf_hash_table (&htab
->root
))
5022 /* Set a flag in the hash table entry indicating the type of
5023 reference or definition we just found. A dynamic symbol
5024 is one which is referenced or defined by both a regular
5025 object and a shared object. */
5026 bool dynsym
= false;
5028 /* Plugin symbols aren't normal. Don't set def/ref flags. */
5029 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5031 /* Except for this flag to track nonweak references. */
5033 && bind
!= STB_WEAK
)
5034 h
->ref_ir_nonweak
= 1;
5041 if (bind
!= STB_WEAK
)
5042 h
->ref_regular_nonweak
= 1;
5059 hi
->ref_dynamic
= 1;
5064 hi
->def_dynamic
= 1;
5068 /* If an indirect symbol has been forced local, don't
5069 make the real symbol dynamic. */
5070 if (h
!= hi
&& hi
->forced_local
)
5074 if (bfd_link_dll (info
)
5084 && weakdef (h
)->dynindx
!= -1))
5088 /* Check to see if we need to add an indirect symbol for
5089 the default name. */
5091 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5093 && hi
->versioned
== versioned_hidden
))
5094 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5095 sec
, value
, &old_bfd
, &dynsym
))
5096 goto error_free_vers
;
5098 /* Check the alignment when a common symbol is involved. This
5099 can change when a common symbol is overridden by a normal
5100 definition or a common symbol is ignored due to the old
5101 normal definition. We need to make sure the maximum
5102 alignment is maintained. */
5103 if ((old_alignment
|| common
)
5104 && h
->root
.type
!= bfd_link_hash_common
)
5106 unsigned int common_align
;
5107 unsigned int normal_align
;
5108 unsigned int symbol_align
;
5112 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5113 || h
->root
.type
== bfd_link_hash_defweak
);
5115 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5116 if (h
->root
.u
.def
.section
->owner
!= NULL
5117 && (h
->root
.u
.def
.section
->owner
->flags
5118 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5120 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5121 if (normal_align
> symbol_align
)
5122 normal_align
= symbol_align
;
5125 normal_align
= symbol_align
;
5129 common_align
= old_alignment
;
5130 common_bfd
= old_bfd
;
5135 common_align
= bfd_log2 (isym
->st_value
);
5137 normal_bfd
= old_bfd
;
5140 if (normal_align
< common_align
)
5142 /* PR binutils/2735 */
5143 if (normal_bfd
== NULL
)
5145 /* xgettext:c-format */
5146 (_("warning: alignment %u of common symbol `%s' in %pB is"
5147 " greater than the alignment (%u) of its section %pA"),
5148 1 << common_align
, name
, common_bfd
,
5149 1 << normal_align
, h
->root
.u
.def
.section
);
5152 /* xgettext:c-format */
5153 (_("warning: alignment %u of symbol `%s' in %pB"
5154 " is smaller than %u in %pB"),
5155 1 << normal_align
, name
, normal_bfd
,
5156 1 << common_align
, common_bfd
);
5160 /* Remember the symbol size if it isn't undefined. */
5161 if (isym
->st_size
!= 0
5162 && isym
->st_shndx
!= SHN_UNDEF
5163 && (definition
|| h
->size
== 0))
5166 && h
->size
!= isym
->st_size
5167 && ! size_change_ok
)
5169 /* xgettext:c-format */
5170 (_("warning: size of symbol `%s' changed"
5171 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5172 name
, (uint64_t) h
->size
, old_bfd
,
5173 (uint64_t) isym
->st_size
, abfd
);
5175 h
->size
= isym
->st_size
;
5178 /* If this is a common symbol, then we always want H->SIZE
5179 to be the size of the common symbol. The code just above
5180 won't fix the size if a common symbol becomes larger. We
5181 don't warn about a size change here, because that is
5182 covered by --warn-common. Allow changes between different
5184 if (h
->root
.type
== bfd_link_hash_common
)
5185 h
->size
= h
->root
.u
.c
.size
;
5187 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5188 && ((definition
&& !new_weak
)
5189 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5190 || h
->type
== STT_NOTYPE
))
5192 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5194 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5196 if (type
== STT_GNU_IFUNC
5197 && (abfd
->flags
& DYNAMIC
) != 0)
5200 if (h
->type
!= type
)
5202 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5203 /* xgettext:c-format */
5205 (_("warning: type of symbol `%s' changed"
5206 " from %d to %d in %pB"),
5207 name
, h
->type
, type
, abfd
);
5213 /* Merge st_other field. */
5214 elf_merge_st_other (abfd
, h
, isym
->st_other
, sec
,
5215 definition
, dynamic
);
5217 /* We don't want to make debug symbol dynamic. */
5219 && (sec
->flags
& SEC_DEBUGGING
)
5220 && !bfd_link_relocatable (info
))
5223 /* Nor should we make plugin symbols dynamic. */
5224 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5229 h
->target_internal
= isym
->st_target_internal
;
5230 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5233 if (definition
&& !dynamic
)
5235 char *p
= strchr (name
, ELF_VER_CHR
);
5236 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5238 /* Queue non-default versions so that .symver x, x@FOO
5239 aliases can be checked. */
5242 size_t amt
= ((isymend
- isym
+ 1)
5243 * sizeof (struct elf_link_hash_entry
*));
5245 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5247 goto error_free_vers
;
5249 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5253 if (dynsym
&& h
->dynindx
== -1)
5255 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5256 goto error_free_vers
;
5258 && weakdef (h
)->dynindx
== -1)
5260 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5261 goto error_free_vers
;
5264 else if (h
->dynindx
!= -1)
5265 /* If the symbol already has a dynamic index, but
5266 visibility says it should not be visible, turn it into
5268 switch (ELF_ST_VISIBILITY (h
->other
))
5272 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
5280 && h
->root
.type
!= bfd_link_hash_indirect
5282 && h
->ref_regular_nonweak
)
5284 && (old_bfd
->flags
& BFD_PLUGIN
) != 0
5285 && h
->ref_ir_nonweak
5286 && !info
->lto_all_symbols_read
)
5287 || (h
->ref_dynamic_nonweak
5288 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5289 && !on_needed_list (elf_dt_name (abfd
),
5290 htab
->needed
, NULL
))))
5292 const char *soname
= elf_dt_name (abfd
);
5294 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5295 h
->root
.root
.string
);
5297 /* A symbol from a library loaded via DT_NEEDED of some
5298 other library is referenced by a regular object.
5299 Add a DT_NEEDED entry for it. Issue an error if
5300 --no-add-needed is used and the reference was not
5303 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5306 /* xgettext:c-format */
5307 (_("%pB: undefined reference to symbol '%s'"),
5309 bfd_set_error (bfd_error_missing_dso
);
5310 goto error_free_vers
;
5313 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5314 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5316 /* Create dynamic sections for backends that require
5317 that be done before setup_gnu_properties. */
5318 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5325 if (info
->lto_plugin_active
5326 && !bfd_link_relocatable (info
)
5327 && (abfd
->flags
& BFD_PLUGIN
) == 0
5333 if (bed
->s
->arch_size
== 32)
5338 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5339 referenced in regular objects so that linker plugin will get
5340 the correct symbol resolution. */
5342 sym_hash
= elf_sym_hashes (abfd
);
5343 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5345 Elf_Internal_Rela
*internal_relocs
;
5346 Elf_Internal_Rela
*rel
, *relend
;
5348 /* Don't check relocations in excluded sections. */
5349 if ((s
->flags
& SEC_RELOC
) == 0
5350 || s
->reloc_count
== 0
5351 || (s
->flags
& SEC_EXCLUDE
) != 0
5352 || ((info
->strip
== strip_all
5353 || info
->strip
== strip_debugger
)
5354 && (s
->flags
& SEC_DEBUGGING
) != 0))
5357 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5360 if (internal_relocs
== NULL
)
5361 goto error_free_vers
;
5363 rel
= internal_relocs
;
5364 relend
= rel
+ s
->reloc_count
;
5365 for ( ; rel
< relend
; rel
++)
5367 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5368 struct elf_link_hash_entry
*h
;
5370 /* Skip local symbols. */
5371 if (r_symndx
< extsymoff
)
5374 h
= sym_hash
[r_symndx
- extsymoff
];
5376 h
->root
.non_ir_ref_regular
= 1;
5379 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5380 free (internal_relocs
);
5389 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5393 /* Restore the symbol table. */
5394 old_ent
= (char *) old_tab
+ tabsize
;
5395 memset (elf_sym_hashes (abfd
), 0,
5396 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5397 htab
->root
.table
.table
= old_table
;
5398 htab
->root
.table
.size
= old_size
;
5399 htab
->root
.table
.count
= old_count
;
5400 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5401 htab
->root
.undefs
= old_undefs
;
5402 htab
->root
.undefs_tail
= old_undefs_tail
;
5403 if (htab
->dynstr
!= NULL
)
5404 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5407 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5409 struct bfd_hash_entry
*p
;
5410 struct elf_link_hash_entry
*h
;
5411 unsigned int non_ir_ref_dynamic
;
5413 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5415 /* Preserve non_ir_ref_dynamic so that this symbol
5416 will be exported when the dynamic lib becomes needed
5417 in the second pass. */
5418 h
= (struct elf_link_hash_entry
*) p
;
5419 if (h
->root
.type
== bfd_link_hash_warning
)
5420 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5421 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5423 h
= (struct elf_link_hash_entry
*) p
;
5424 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5425 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5426 if (h
->root
.type
== bfd_link_hash_warning
)
5428 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5429 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5430 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5432 if (h
->root
.type
== bfd_link_hash_common
)
5434 memcpy (h
->root
.u
.c
.p
, old_ent
, sizeof (*h
->root
.u
.c
.p
));
5435 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
5437 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5441 /* Make a special call to the linker "notice" function to
5442 tell it that symbols added for crefs may need to be removed. */
5443 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5444 goto error_free_vers
;
5447 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5449 free (nondeflt_vers
);
5453 if (old_tab
!= NULL
)
5455 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5456 goto error_free_vers
;
5461 /* Now that all the symbols from this input file are created, if
5462 not performing a relocatable link, handle .symver foo, foo@BAR
5463 such that any relocs against foo become foo@BAR. */
5464 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5468 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5470 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5471 char *shortname
, *p
;
5474 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5476 || (h
->root
.type
!= bfd_link_hash_defined
5477 && h
->root
.type
!= bfd_link_hash_defweak
))
5480 amt
= p
- h
->root
.root
.string
;
5481 shortname
= (char *) bfd_malloc (amt
+ 1);
5483 goto error_free_vers
;
5484 memcpy (shortname
, h
->root
.root
.string
, amt
);
5485 shortname
[amt
] = '\0';
5487 hi
= (struct elf_link_hash_entry
*)
5488 bfd_link_hash_lookup (&htab
->root
, shortname
,
5489 false, false, false);
5491 && hi
->root
.type
== h
->root
.type
5492 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5493 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5495 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
5496 hi
->root
.type
= bfd_link_hash_indirect
;
5497 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5498 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5499 sym_hash
= elf_sym_hashes (abfd
);
5501 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5502 if (sym_hash
[symidx
] == hi
)
5504 sym_hash
[symidx
] = h
;
5510 free (nondeflt_vers
);
5511 nondeflt_vers
= NULL
;
5514 /* Now set the alias field correctly for all the weak defined
5515 symbols we found. The only way to do this is to search all the
5516 symbols. Since we only need the information for non functions in
5517 dynamic objects, that's the only time we actually put anything on
5518 the list WEAKS. We need this information so that if a regular
5519 object refers to a symbol defined weakly in a dynamic object, the
5520 real symbol in the dynamic object is also put in the dynamic
5521 symbols; we also must arrange for both symbols to point to the
5522 same memory location. We could handle the general case of symbol
5523 aliasing, but a general symbol alias can only be generated in
5524 assembler code, handling it correctly would be very time
5525 consuming, and other ELF linkers don't handle general aliasing
5529 struct elf_link_hash_entry
**hpp
;
5530 struct elf_link_hash_entry
**hppend
;
5531 struct elf_link_hash_entry
**sorted_sym_hash
;
5532 struct elf_link_hash_entry
*h
;
5533 size_t sym_count
, amt
;
5535 /* Since we have to search the whole symbol list for each weak
5536 defined symbol, search time for N weak defined symbols will be
5537 O(N^2). Binary search will cut it down to O(NlogN). */
5538 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5539 sorted_sym_hash
= bfd_malloc (amt
);
5540 if (sorted_sym_hash
== NULL
)
5542 sym_hash
= sorted_sym_hash
;
5543 hpp
= elf_sym_hashes (abfd
);
5544 hppend
= hpp
+ extsymcount
;
5546 for (; hpp
< hppend
; hpp
++)
5550 && h
->root
.type
== bfd_link_hash_defined
5551 && !bed
->is_function_type (h
->type
))
5559 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5562 while (weaks
!= NULL
)
5564 struct elf_link_hash_entry
*hlook
;
5567 size_t i
, j
, idx
= 0;
5570 weaks
= hlook
->u
.alias
;
5571 hlook
->u
.alias
= NULL
;
5573 if (hlook
->root
.type
!= bfd_link_hash_defined
5574 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5577 slook
= hlook
->root
.u
.def
.section
;
5578 vlook
= hlook
->root
.u
.def
.value
;
5584 bfd_signed_vma vdiff
;
5586 h
= sorted_sym_hash
[idx
];
5587 vdiff
= vlook
- h
->root
.u
.def
.value
;
5594 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5604 /* We didn't find a value/section match. */
5608 /* With multiple aliases, or when the weak symbol is already
5609 strongly defined, we have multiple matching symbols and
5610 the binary search above may land on any of them. Step
5611 one past the matching symbol(s). */
5614 h
= sorted_sym_hash
[idx
];
5615 if (h
->root
.u
.def
.section
!= slook
5616 || h
->root
.u
.def
.value
!= vlook
)
5620 /* Now look back over the aliases. Since we sorted by size
5621 as well as value and section, we'll choose the one with
5622 the largest size. */
5625 h
= sorted_sym_hash
[idx
];
5627 /* Stop if value or section doesn't match. */
5628 if (h
->root
.u
.def
.section
!= slook
5629 || h
->root
.u
.def
.value
!= vlook
)
5631 else if (h
!= hlook
)
5633 struct elf_link_hash_entry
*t
;
5636 hlook
->is_weakalias
= 1;
5638 if (t
->u
.alias
!= NULL
)
5639 while (t
->u
.alias
!= h
)
5643 /* If the weak definition is in the list of dynamic
5644 symbols, make sure the real definition is put
5646 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5648 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5651 free (sorted_sym_hash
);
5656 /* If the real definition is in the list of dynamic
5657 symbols, make sure the weak definition is put
5658 there as well. If we don't do this, then the
5659 dynamic loader might not merge the entries for the
5660 real definition and the weak definition. */
5661 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5663 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5664 goto err_free_sym_hash
;
5671 free (sorted_sym_hash
);
5674 if (bed
->check_directives
5675 && !(*bed
->check_directives
) (abfd
, info
))
5678 /* If this is a non-traditional link, try to optimize the handling
5679 of the .stab/.stabstr sections. */
5681 && ! info
->traditional_format
5682 && is_elf_hash_table (&htab
->root
)
5683 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5687 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5688 if (stabstr
!= NULL
)
5690 bfd_size_type string_offset
= 0;
5693 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5694 if (startswith (stab
->name
, ".stab")
5695 && (!stab
->name
[5] ||
5696 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5697 && (stab
->flags
& SEC_MERGE
) == 0
5698 && !bfd_is_abs_section (stab
->output_section
))
5700 struct bfd_elf_section_data
*secdata
;
5702 secdata
= elf_section_data (stab
);
5703 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5704 stabstr
, &secdata
->sec_info
,
5707 if (secdata
->sec_info
)
5708 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5713 if (dynamic
&& add_needed
)
5715 /* Add this bfd to the loaded list. */
5716 struct elf_link_loaded_list
*n
;
5718 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5722 n
->next
= htab
->dyn_loaded
;
5723 htab
->dyn_loaded
= n
;
5725 if (dynamic
&& !add_needed
5726 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5727 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5734 free (nondeflt_vers
);
5742 /* Return the linker hash table entry of a symbol that might be
5743 satisfied by an archive symbol. Return -1 on error. */
5745 struct bfd_link_hash_entry
*
5746 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5747 struct bfd_link_info
*info
,
5750 struct bfd_link_hash_entry
*h
;
5754 h
= bfd_link_hash_lookup (info
->hash
, name
, false, false, true);
5758 /* If this is a default version (the name contains @@), look up the
5759 symbol again with only one `@' as well as without the version.
5760 The effect is that references to the symbol with and without the
5761 version will be matched by the default symbol in the archive. */
5763 p
= strchr (name
, ELF_VER_CHR
);
5764 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5767 /* First check with only one `@'. */
5768 len
= strlen (name
);
5769 copy
= (char *) bfd_alloc (abfd
, len
);
5771 return (struct bfd_link_hash_entry
*) -1;
5773 first
= p
- name
+ 1;
5774 memcpy (copy
, name
, first
);
5775 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5777 h
= bfd_link_hash_lookup (info
->hash
, copy
, false, false, true);
5780 /* We also need to check references to the symbol without the
5782 copy
[first
- 1] = '\0';
5783 h
= bfd_link_hash_lookup (info
->hash
, copy
, false, false, true);
5786 bfd_release (abfd
, copy
);
5790 /* Add symbols from an ELF archive file to the linker hash table. We
5791 don't use _bfd_generic_link_add_archive_symbols because we need to
5792 handle versioned symbols.
5794 Fortunately, ELF archive handling is simpler than that done by
5795 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5796 oddities. In ELF, if we find a symbol in the archive map, and the
5797 symbol is currently undefined, we know that we must pull in that
5800 Unfortunately, we do have to make multiple passes over the symbol
5801 table until nothing further is resolved. */
5804 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5807 unsigned char *included
= NULL
;
5811 const struct elf_backend_data
*bed
;
5812 struct bfd_link_hash_entry
* (*archive_symbol_lookup
)
5813 (bfd
*, struct bfd_link_info
*, const char *);
5815 if (! bfd_has_map (abfd
))
5817 /* An empty archive is a special case. */
5818 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5820 bfd_set_error (bfd_error_no_armap
);
5824 /* Keep track of all symbols we know to be already defined, and all
5825 files we know to be already included. This is to speed up the
5826 second and subsequent passes. */
5827 c
= bfd_ardata (abfd
)->symdef_count
;
5830 amt
= c
* sizeof (*included
);
5831 included
= (unsigned char *) bfd_zmalloc (amt
);
5832 if (included
== NULL
)
5835 symdefs
= bfd_ardata (abfd
)->symdefs
;
5836 bed
= get_elf_backend_data (abfd
);
5837 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5850 symdefend
= symdef
+ c
;
5851 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5853 struct bfd_link_hash_entry
*h
;
5855 struct bfd_link_hash_entry
*undefs_tail
;
5860 if (symdef
->file_offset
== last
)
5866 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5867 if (h
== (struct bfd_link_hash_entry
*) -1)
5873 if (h
->type
== bfd_link_hash_undefined
)
5875 /* If the archive element has already been loaded then one
5876 of the symbols defined by that element might have been
5877 made undefined due to being in a discarded section. */
5878 if (is_elf_hash_table (info
->hash
)
5879 && ((struct elf_link_hash_entry
*) h
)->indx
== -3)
5882 else if (h
->type
== bfd_link_hash_common
)
5884 /* We currently have a common symbol. The archive map contains
5885 a reference to this symbol, so we may want to include it. We
5886 only want to include it however, if this archive element
5887 contains a definition of the symbol, not just another common
5890 Unfortunately some archivers (including GNU ar) will put
5891 declarations of common symbols into their archive maps, as
5892 well as real definitions, so we cannot just go by the archive
5893 map alone. Instead we must read in the element's symbol
5894 table and check that to see what kind of symbol definition
5896 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5901 if (h
->type
!= bfd_link_hash_undefweak
)
5902 /* Symbol must be defined. Don't check it again. */
5907 /* We need to include this archive member. */
5908 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5909 if (element
== NULL
)
5912 if (! bfd_check_format (element
, bfd_object
))
5915 undefs_tail
= info
->hash
->undefs_tail
;
5917 if (!(*info
->callbacks
5918 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5920 if (!bfd_link_add_symbols (element
, info
))
5923 /* If there are any new undefined symbols, we need to make
5924 another pass through the archive in order to see whether
5925 they can be defined. FIXME: This isn't perfect, because
5926 common symbols wind up on undefs_tail and because an
5927 undefined symbol which is defined later on in this pass
5928 does not require another pass. This isn't a bug, but it
5929 does make the code less efficient than it could be. */
5930 if (undefs_tail
!= info
->hash
->undefs_tail
)
5933 /* Look backward to mark all symbols from this object file
5934 which we have already seen in this pass. */
5938 included
[mark
] = true;
5943 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5945 /* We mark subsequent symbols from this object file as we go
5946 on through the loop. */
5947 last
= symdef
->file_offset
;
5960 /* Given an ELF BFD, add symbols to the global hash table as
5964 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5966 switch (bfd_get_format (abfd
))
5969 return elf_link_add_object_symbols (abfd
, info
);
5971 return elf_link_add_archive_symbols (abfd
, info
);
5973 bfd_set_error (bfd_error_wrong_format
);
5978 struct hash_codes_info
5980 unsigned long *hashcodes
;
5984 /* This function will be called though elf_link_hash_traverse to store
5985 all hash value of the exported symbols in an array. */
5988 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5990 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5995 /* Ignore indirect symbols. These are added by the versioning code. */
5996 if (h
->dynindx
== -1)
5999 name
= h
->root
.root
.string
;
6000 if (h
->versioned
>= versioned
)
6002 char *p
= strchr (name
, ELF_VER_CHR
);
6005 alc
= (char *) bfd_malloc (p
- name
+ 1);
6011 memcpy (alc
, name
, p
- name
);
6012 alc
[p
- name
] = '\0';
6017 /* Compute the hash value. */
6018 ha
= bfd_elf_hash (name
);
6020 /* Store the found hash value in the array given as the argument. */
6021 *(inf
->hashcodes
)++ = ha
;
6023 /* And store it in the struct so that we can put it in the hash table
6025 h
->u
.elf_hash_value
= ha
;
6031 struct collect_gnu_hash_codes
6034 const struct elf_backend_data
*bed
;
6035 unsigned long int nsyms
;
6036 unsigned long int maskbits
;
6037 unsigned long int *hashcodes
;
6038 unsigned long int *hashval
;
6039 unsigned long int *indx
;
6040 unsigned long int *counts
;
6044 long int min_dynindx
;
6045 unsigned long int bucketcount
;
6046 unsigned long int symindx
;
6047 long int local_indx
;
6048 long int shift1
, shift2
;
6049 unsigned long int mask
;
6053 /* This function will be called though elf_link_hash_traverse to store
6054 all hash value of the exported symbols in an array. */
6057 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6059 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6064 /* Ignore indirect symbols. These are added by the versioning code. */
6065 if (h
->dynindx
== -1)
6068 /* Ignore also local symbols and undefined symbols. */
6069 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6072 name
= h
->root
.root
.string
;
6073 if (h
->versioned
>= versioned
)
6075 char *p
= strchr (name
, ELF_VER_CHR
);
6078 alc
= (char *) bfd_malloc (p
- name
+ 1);
6084 memcpy (alc
, name
, p
- name
);
6085 alc
[p
- name
] = '\0';
6090 /* Compute the hash value. */
6091 ha
= bfd_elf_gnu_hash (name
);
6093 /* Store the found hash value in the array for compute_bucket_count,
6094 and also for .dynsym reordering purposes. */
6095 s
->hashcodes
[s
->nsyms
] = ha
;
6096 s
->hashval
[h
->dynindx
] = ha
;
6098 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6099 s
->min_dynindx
= h
->dynindx
;
6105 /* This function will be called though elf_link_hash_traverse to do
6106 final dynamic symbol renumbering in case of .gnu.hash.
6107 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6108 to the translation table. */
6111 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6113 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6114 unsigned long int bucket
;
6115 unsigned long int val
;
6117 /* Ignore indirect symbols. */
6118 if (h
->dynindx
== -1)
6121 /* Ignore also local symbols and undefined symbols. */
6122 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6124 if (h
->dynindx
>= s
->min_dynindx
)
6126 if (s
->bed
->record_xhash_symbol
!= NULL
)
6128 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6132 h
->dynindx
= s
->local_indx
++;
6137 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6138 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6139 & ((s
->maskbits
>> s
->shift1
) - 1);
6140 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6142 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6143 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6144 if (s
->counts
[bucket
] == 1)
6145 /* Last element terminates the chain. */
6147 bfd_put_32 (s
->output_bfd
, val
,
6148 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6149 --s
->counts
[bucket
];
6150 if (s
->bed
->record_xhash_symbol
!= NULL
)
6152 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6154 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6157 h
->dynindx
= s
->indx
[bucket
]++;
6161 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6164 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6166 return !(h
->forced_local
6167 || h
->root
.type
== bfd_link_hash_undefined
6168 || h
->root
.type
== bfd_link_hash_undefweak
6169 || ((h
->root
.type
== bfd_link_hash_defined
6170 || h
->root
.type
== bfd_link_hash_defweak
)
6171 && h
->root
.u
.def
.section
->output_section
== NULL
));
6174 /* Array used to determine the number of hash table buckets to use
6175 based on the number of symbols there are. If there are fewer than
6176 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6177 fewer than 37 we use 17 buckets, and so forth. We never use more
6178 than 32771 buckets. */
6180 static const size_t elf_buckets
[] =
6182 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6186 /* Compute bucket count for hashing table. We do not use a static set
6187 of possible tables sizes anymore. Instead we determine for all
6188 possible reasonable sizes of the table the outcome (i.e., the
6189 number of collisions etc) and choose the best solution. The
6190 weighting functions are not too simple to allow the table to grow
6191 without bounds. Instead one of the weighting factors is the size.
6192 Therefore the result is always a good payoff between few collisions
6193 (= short chain lengths) and table size. */
6195 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6196 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6197 unsigned long int nsyms
,
6200 size_t best_size
= 0;
6201 unsigned long int i
;
6203 /* We have a problem here. The following code to optimize the table
6204 size requires an integer type with more the 32 bits. If
6205 BFD_HOST_U_64_BIT is set we know about such a type. */
6206 #ifdef BFD_HOST_U_64_BIT
6211 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6212 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6213 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6214 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6215 unsigned long int *counts
;
6217 unsigned int no_improvement_count
= 0;
6219 /* Possible optimization parameters: if we have NSYMS symbols we say
6220 that the hashing table must at least have NSYMS/4 and at most
6222 minsize
= nsyms
/ 4;
6225 best_size
= maxsize
= nsyms
* 2;
6230 if ((best_size
& 31) == 0)
6234 /* Create array where we count the collisions in. We must use bfd_malloc
6235 since the size could be large. */
6237 amt
*= sizeof (unsigned long int);
6238 counts
= (unsigned long int *) bfd_malloc (amt
);
6242 /* Compute the "optimal" size for the hash table. The criteria is a
6243 minimal chain length. The minor criteria is (of course) the size
6245 for (i
= minsize
; i
< maxsize
; ++i
)
6247 /* Walk through the array of hashcodes and count the collisions. */
6248 BFD_HOST_U_64_BIT max
;
6249 unsigned long int j
;
6250 unsigned long int fact
;
6252 if (gnu_hash
&& (i
& 31) == 0)
6255 memset (counts
, '\0', i
* sizeof (unsigned long int));
6257 /* Determine how often each hash bucket is used. */
6258 for (j
= 0; j
< nsyms
; ++j
)
6259 ++counts
[hashcodes
[j
] % i
];
6261 /* For the weight function we need some information about the
6262 pagesize on the target. This is information need not be 100%
6263 accurate. Since this information is not available (so far) we
6264 define it here to a reasonable default value. If it is crucial
6265 to have a better value some day simply define this value. */
6266 # ifndef BFD_TARGET_PAGESIZE
6267 # define BFD_TARGET_PAGESIZE (4096)
6270 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6272 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6275 /* Variant 1: optimize for short chains. We add the squares
6276 of all the chain lengths (which favors many small chain
6277 over a few long chains). */
6278 for (j
= 0; j
< i
; ++j
)
6279 max
+= counts
[j
] * counts
[j
];
6281 /* This adds penalties for the overall size of the table. */
6282 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6285 /* Variant 2: Optimize a lot more for small table. Here we
6286 also add squares of the size but we also add penalties for
6287 empty slots (the +1 term). */
6288 for (j
= 0; j
< i
; ++j
)
6289 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6291 /* The overall size of the table is considered, but not as
6292 strong as in variant 1, where it is squared. */
6293 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6297 /* Compare with current best results. */
6298 if (max
< best_chlen
)
6302 no_improvement_count
= 0;
6304 /* PR 11843: Avoid futile long searches for the best bucket size
6305 when there are a large number of symbols. */
6306 else if (++no_improvement_count
== 100)
6313 #endif /* defined (BFD_HOST_U_64_BIT) */
6315 /* This is the fallback solution if no 64bit type is available or if we
6316 are not supposed to spend much time on optimizations. We select the
6317 bucket count using a fixed set of numbers. */
6318 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6320 best_size
= elf_buckets
[i
];
6321 if (nsyms
< elf_buckets
[i
+ 1])
6324 if (gnu_hash
&& best_size
< 2)
6331 /* Size any SHT_GROUP section for ld -r. */
6334 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6339 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6340 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6341 && (s
= ibfd
->sections
) != NULL
6342 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6343 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6348 /* Set a default stack segment size. The value in INFO wins. If it
6349 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6350 undefined it is initialized. */
6353 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6354 struct bfd_link_info
*info
,
6355 const char *legacy_symbol
,
6356 bfd_vma default_size
)
6358 struct elf_link_hash_entry
*h
= NULL
;
6360 /* Look for legacy symbol. */
6362 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6363 false, false, false);
6364 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6365 || h
->root
.type
== bfd_link_hash_defweak
)
6367 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6369 /* The symbol has no type if specified on the command line. */
6370 h
->type
= STT_OBJECT
;
6371 if (info
->stacksize
)
6372 /* xgettext:c-format */
6373 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6374 output_bfd
, legacy_symbol
);
6375 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6376 /* xgettext:c-format */
6377 _bfd_error_handler (_("%pB: %s not absolute"),
6378 output_bfd
, legacy_symbol
);
6380 info
->stacksize
= h
->root
.u
.def
.value
;
6383 if (!info
->stacksize
)
6384 /* If the user didn't set a size, or explicitly inhibit the
6385 size, set it now. */
6386 info
->stacksize
= default_size
;
6388 /* Provide the legacy symbol, if it is referenced. */
6389 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6390 || h
->root
.type
== bfd_link_hash_undefweak
))
6392 struct bfd_link_hash_entry
*bh
= NULL
;
6394 if (!(_bfd_generic_link_add_one_symbol
6395 (info
, output_bfd
, legacy_symbol
,
6396 BSF_GLOBAL
, bfd_abs_section_ptr
,
6397 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6398 NULL
, false, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6401 h
= (struct elf_link_hash_entry
*) bh
;
6403 h
->type
= STT_OBJECT
;
6409 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6411 struct elf_gc_sweep_symbol_info
6413 struct bfd_link_info
*info
;
6414 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6419 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6422 && (((h
->root
.type
== bfd_link_hash_defined
6423 || h
->root
.type
== bfd_link_hash_defweak
)
6424 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6425 && h
->root
.u
.def
.section
->gc_mark
))
6426 || h
->root
.type
== bfd_link_hash_undefined
6427 || h
->root
.type
== bfd_link_hash_undefweak
))
6429 struct elf_gc_sweep_symbol_info
*inf
;
6431 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6432 (*inf
->hide_symbol
) (inf
->info
, h
, true);
6435 h
->ref_regular_nonweak
= 0;
6441 /* Set up the sizes and contents of the ELF dynamic sections. This is
6442 called by the ELF linker emulation before_allocation routine. We
6443 must set the sizes of the sections before the linker sets the
6444 addresses of the various sections. */
6447 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6450 const char *filter_shlib
,
6452 const char *depaudit
,
6453 const char * const *auxiliary_filters
,
6454 struct bfd_link_info
*info
,
6455 asection
**sinterpptr
)
6458 const struct elf_backend_data
*bed
;
6462 if (!is_elf_hash_table (info
->hash
))
6465 dynobj
= elf_hash_table (info
)->dynobj
;
6467 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6469 struct bfd_elf_version_tree
*verdefs
;
6470 struct elf_info_failed asvinfo
;
6471 struct bfd_elf_version_tree
*t
;
6472 struct bfd_elf_version_expr
*d
;
6476 /* If we are supposed to export all symbols into the dynamic symbol
6477 table (this is not the normal case), then do so. */
6478 if (info
->export_dynamic
6479 || (bfd_link_executable (info
) && info
->dynamic
))
6481 struct elf_info_failed eif
;
6485 elf_link_hash_traverse (elf_hash_table (info
),
6486 _bfd_elf_export_symbol
,
6494 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6496 if (soname_indx
== (size_t) -1
6497 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6501 soname_indx
= (size_t) -1;
6503 /* Make all global versions with definition. */
6504 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6505 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6506 if (!d
->symver
&& d
->literal
)
6508 const char *verstr
, *name
;
6509 size_t namelen
, verlen
, newlen
;
6510 char *newname
, *p
, leading_char
;
6511 struct elf_link_hash_entry
*newh
;
6513 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6515 namelen
= strlen (name
) + (leading_char
!= '\0');
6517 verlen
= strlen (verstr
);
6518 newlen
= namelen
+ verlen
+ 3;
6520 newname
= (char *) bfd_malloc (newlen
);
6521 if (newname
== NULL
)
6523 newname
[0] = leading_char
;
6524 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6526 /* Check the hidden versioned definition. */
6527 p
= newname
+ namelen
;
6529 memcpy (p
, verstr
, verlen
+ 1);
6530 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6531 newname
, false, false,
6534 || (newh
->root
.type
!= bfd_link_hash_defined
6535 && newh
->root
.type
!= bfd_link_hash_defweak
))
6537 /* Check the default versioned definition. */
6539 memcpy (p
, verstr
, verlen
+ 1);
6540 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6541 newname
, false, false,
6546 /* Mark this version if there is a definition and it is
6547 not defined in a shared object. */
6549 && !newh
->def_dynamic
6550 && (newh
->root
.type
== bfd_link_hash_defined
6551 || newh
->root
.type
== bfd_link_hash_defweak
))
6555 /* Attach all the symbols to their version information. */
6556 asvinfo
.info
= info
;
6557 asvinfo
.failed
= false;
6559 elf_link_hash_traverse (elf_hash_table (info
),
6560 _bfd_elf_link_assign_sym_version
,
6565 if (!info
->allow_undefined_version
)
6567 /* Check if all global versions have a definition. */
6568 bool all_defined
= true;
6569 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6570 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6571 if (d
->literal
&& !d
->symver
&& !d
->script
)
6574 (_("%s: undefined version: %s"),
6575 d
->pattern
, t
->name
);
6576 all_defined
= false;
6581 bfd_set_error (bfd_error_bad_value
);
6586 /* Set up the version definition section. */
6587 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6588 BFD_ASSERT (s
!= NULL
);
6590 /* We may have created additional version definitions if we are
6591 just linking a regular application. */
6592 verdefs
= info
->version_info
;
6594 /* Skip anonymous version tag. */
6595 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6596 verdefs
= verdefs
->next
;
6598 if (verdefs
== NULL
&& !info
->create_default_symver
)
6599 s
->flags
|= SEC_EXCLUDE
;
6605 Elf_Internal_Verdef def
;
6606 Elf_Internal_Verdaux defaux
;
6607 struct bfd_link_hash_entry
*bh
;
6608 struct elf_link_hash_entry
*h
;
6614 /* Make space for the base version. */
6615 size
+= sizeof (Elf_External_Verdef
);
6616 size
+= sizeof (Elf_External_Verdaux
);
6619 /* Make space for the default version. */
6620 if (info
->create_default_symver
)
6622 size
+= sizeof (Elf_External_Verdef
);
6626 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6628 struct bfd_elf_version_deps
*n
;
6630 /* Don't emit base version twice. */
6634 size
+= sizeof (Elf_External_Verdef
);
6635 size
+= sizeof (Elf_External_Verdaux
);
6638 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6639 size
+= sizeof (Elf_External_Verdaux
);
6643 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6644 if (s
->contents
== NULL
&& s
->size
!= 0)
6647 /* Fill in the version definition section. */
6651 def
.vd_version
= VER_DEF_CURRENT
;
6652 def
.vd_flags
= VER_FLG_BASE
;
6655 if (info
->create_default_symver
)
6657 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6658 def
.vd_next
= sizeof (Elf_External_Verdef
);
6662 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6663 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6664 + sizeof (Elf_External_Verdaux
));
6667 if (soname_indx
!= (size_t) -1)
6669 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6671 def
.vd_hash
= bfd_elf_hash (soname
);
6672 defaux
.vda_name
= soname_indx
;
6679 name
= lbasename (bfd_get_filename (output_bfd
));
6680 def
.vd_hash
= bfd_elf_hash (name
);
6681 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6683 if (indx
== (size_t) -1)
6685 defaux
.vda_name
= indx
;
6687 defaux
.vda_next
= 0;
6689 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6690 (Elf_External_Verdef
*) p
);
6691 p
+= sizeof (Elf_External_Verdef
);
6692 if (info
->create_default_symver
)
6694 /* Add a symbol representing this version. */
6696 if (! (_bfd_generic_link_add_one_symbol
6697 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6699 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6701 h
= (struct elf_link_hash_entry
*) bh
;
6704 h
->type
= STT_OBJECT
;
6705 h
->verinfo
.vertree
= NULL
;
6707 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6710 /* Create a duplicate of the base version with the same
6711 aux block, but different flags. */
6714 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6716 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6717 + sizeof (Elf_External_Verdaux
));
6720 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6721 (Elf_External_Verdef
*) p
);
6722 p
+= sizeof (Elf_External_Verdef
);
6724 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6725 (Elf_External_Verdaux
*) p
);
6726 p
+= sizeof (Elf_External_Verdaux
);
6728 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6731 struct bfd_elf_version_deps
*n
;
6733 /* Don't emit the base version twice. */
6738 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6741 /* Add a symbol representing this version. */
6743 if (! (_bfd_generic_link_add_one_symbol
6744 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6746 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6748 h
= (struct elf_link_hash_entry
*) bh
;
6751 h
->type
= STT_OBJECT
;
6752 h
->verinfo
.vertree
= t
;
6754 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6757 def
.vd_version
= VER_DEF_CURRENT
;
6759 if (t
->globals
.list
== NULL
6760 && t
->locals
.list
== NULL
6762 def
.vd_flags
|= VER_FLG_WEAK
;
6763 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6764 def
.vd_cnt
= cdeps
+ 1;
6765 def
.vd_hash
= bfd_elf_hash (t
->name
);
6766 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6769 /* If a basever node is next, it *must* be the last node in
6770 the chain, otherwise Verdef construction breaks. */
6771 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6772 BFD_ASSERT (t
->next
->next
== NULL
);
6774 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6775 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6776 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6778 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6779 (Elf_External_Verdef
*) p
);
6780 p
+= sizeof (Elf_External_Verdef
);
6782 defaux
.vda_name
= h
->dynstr_index
;
6783 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6785 defaux
.vda_next
= 0;
6786 if (t
->deps
!= NULL
)
6787 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6788 t
->name_indx
= defaux
.vda_name
;
6790 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6791 (Elf_External_Verdaux
*) p
);
6792 p
+= sizeof (Elf_External_Verdaux
);
6794 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6796 if (n
->version_needed
== NULL
)
6798 /* This can happen if there was an error in the
6800 defaux
.vda_name
= 0;
6804 defaux
.vda_name
= n
->version_needed
->name_indx
;
6805 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6808 if (n
->next
== NULL
)
6809 defaux
.vda_next
= 0;
6811 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6813 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6814 (Elf_External_Verdaux
*) p
);
6815 p
+= sizeof (Elf_External_Verdaux
);
6819 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6823 bed
= get_elf_backend_data (output_bfd
);
6825 if (info
->gc_sections
&& bed
->can_gc_sections
)
6827 struct elf_gc_sweep_symbol_info sweep_info
;
6829 /* Remove the symbols that were in the swept sections from the
6830 dynamic symbol table. */
6831 sweep_info
.info
= info
;
6832 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6833 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6837 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6840 struct elf_find_verdep_info sinfo
;
6842 /* Work out the size of the version reference section. */
6844 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6845 BFD_ASSERT (s
!= NULL
);
6848 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6849 if (sinfo
.vers
== 0)
6851 sinfo
.failed
= false;
6853 elf_link_hash_traverse (elf_hash_table (info
),
6854 _bfd_elf_link_find_version_dependencies
,
6859 if (elf_tdata (output_bfd
)->verref
== NULL
)
6860 s
->flags
|= SEC_EXCLUDE
;
6863 Elf_Internal_Verneed
*vn
;
6868 /* Build the version dependency section. */
6871 for (vn
= elf_tdata (output_bfd
)->verref
;
6873 vn
= vn
->vn_nextref
)
6875 Elf_Internal_Vernaux
*a
;
6877 size
+= sizeof (Elf_External_Verneed
);
6879 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6880 size
+= sizeof (Elf_External_Vernaux
);
6884 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6885 if (s
->contents
== NULL
)
6889 for (vn
= elf_tdata (output_bfd
)->verref
;
6891 vn
= vn
->vn_nextref
)
6894 Elf_Internal_Vernaux
*a
;
6898 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6901 vn
->vn_version
= VER_NEED_CURRENT
;
6903 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6904 elf_dt_name (vn
->vn_bfd
) != NULL
6905 ? elf_dt_name (vn
->vn_bfd
)
6906 : lbasename (bfd_get_filename
6909 if (indx
== (size_t) -1)
6912 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6913 if (vn
->vn_nextref
== NULL
)
6916 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6917 + caux
* sizeof (Elf_External_Vernaux
));
6919 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6920 (Elf_External_Verneed
*) p
);
6921 p
+= sizeof (Elf_External_Verneed
);
6923 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6925 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6926 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6927 a
->vna_nodename
, false);
6928 if (indx
== (size_t) -1)
6931 if (a
->vna_nextptr
== NULL
)
6934 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6936 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6937 (Elf_External_Vernaux
*) p
);
6938 p
+= sizeof (Elf_External_Vernaux
);
6942 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6946 /* Any syms created from now on start with -1 in
6947 got.refcount/offset and plt.refcount/offset. */
6948 elf_hash_table (info
)->init_got_refcount
6949 = elf_hash_table (info
)->init_got_offset
;
6950 elf_hash_table (info
)->init_plt_refcount
6951 = elf_hash_table (info
)->init_plt_offset
;
6953 if (bfd_link_relocatable (info
)
6954 && !_bfd_elf_size_group_sections (info
))
6957 /* The backend may have to create some sections regardless of whether
6958 we're dynamic or not. */
6959 if (bed
->elf_backend_always_size_sections
6960 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6963 /* Determine any GNU_STACK segment requirements, after the backend
6964 has had a chance to set a default segment size. */
6965 if (info
->execstack
)
6966 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6967 else if (info
->noexecstack
)
6968 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6972 asection
*notesec
= NULL
;
6975 for (inputobj
= info
->input_bfds
;
6977 inputobj
= inputobj
->link
.next
)
6982 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6984 s
= inputobj
->sections
;
6985 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6988 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6991 if (s
->flags
& SEC_CODE
)
6995 else if (bed
->default_execstack
)
6998 if (notesec
|| info
->stacksize
> 0)
6999 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
7000 if (notesec
&& exec
&& bfd_link_relocatable (info
)
7001 && notesec
->output_section
!= bfd_abs_section_ptr
)
7002 notesec
->output_section
->flags
|= SEC_CODE
;
7005 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7007 struct elf_info_failed eif
;
7008 struct elf_link_hash_entry
*h
;
7012 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
7013 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
7017 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
7019 info
->flags
|= DF_SYMBOLIC
;
7027 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
7029 if (indx
== (size_t) -1)
7032 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
7033 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
7037 if (filter_shlib
!= NULL
)
7041 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7042 filter_shlib
, true);
7043 if (indx
== (size_t) -1
7044 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
7048 if (auxiliary_filters
!= NULL
)
7050 const char * const *p
;
7052 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
7056 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7058 if (indx
== (size_t) -1
7059 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7068 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7070 if (indx
== (size_t) -1
7071 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7075 if (depaudit
!= NULL
)
7079 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7081 if (indx
== (size_t) -1
7082 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7089 /* Find all symbols which were defined in a dynamic object and make
7090 the backend pick a reasonable value for them. */
7091 elf_link_hash_traverse (elf_hash_table (info
),
7092 _bfd_elf_adjust_dynamic_symbol
,
7097 /* Add some entries to the .dynamic section. We fill in some of the
7098 values later, in bfd_elf_final_link, but we must add the entries
7099 now so that we know the final size of the .dynamic section. */
7101 /* If there are initialization and/or finalization functions to
7102 call then add the corresponding DT_INIT/DT_FINI entries. */
7103 h
= (info
->init_function
7104 ? elf_link_hash_lookup (elf_hash_table (info
),
7105 info
->init_function
, false,
7112 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7115 h
= (info
->fini_function
7116 ? elf_link_hash_lookup (elf_hash_table (info
),
7117 info
->fini_function
, false,
7124 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7128 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7129 if (s
!= NULL
&& s
->linker_has_input
)
7131 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7132 if (! bfd_link_executable (info
))
7137 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7138 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7139 && (o
= sub
->sections
) != NULL
7140 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7141 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7142 if (elf_section_data (o
)->this_hdr
.sh_type
7143 == SHT_PREINIT_ARRAY
)
7146 (_("%pB: .preinit_array section is not allowed in DSO"),
7151 bfd_set_error (bfd_error_nonrepresentable_section
);
7155 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7156 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7159 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7160 if (s
!= NULL
&& s
->linker_has_input
)
7162 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7163 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7166 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7167 if (s
!= NULL
&& s
->linker_has_input
)
7169 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7170 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7174 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7175 /* If .dynstr is excluded from the link, we don't want any of
7176 these tags. Strictly, we should be checking each section
7177 individually; This quick check covers for the case where
7178 someone does a /DISCARD/ : { *(*) }. */
7179 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7181 bfd_size_type strsize
;
7183 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7184 if ((info
->emit_hash
7185 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7186 || (info
->emit_gnu_hash
7187 && (bed
->record_xhash_symbol
== NULL
7188 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7189 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7190 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7191 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7192 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7194 || (info
->gnu_flags_1
7195 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_FLAGS_1
,
7196 info
->gnu_flags_1
)))
7201 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7204 /* The backend must work out the sizes of all the other dynamic
7207 && bed
->elf_backend_size_dynamic_sections
!= NULL
7208 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7211 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7213 if (elf_tdata (output_bfd
)->cverdefs
)
7215 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7217 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7218 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7222 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7224 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7227 else if (info
->flags
& DF_BIND_NOW
)
7229 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7235 if (bfd_link_executable (info
))
7236 info
->flags_1
&= ~ (DF_1_INITFIRST
7239 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7243 if (elf_tdata (output_bfd
)->cverrefs
)
7245 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7247 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7248 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7252 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7253 && elf_tdata (output_bfd
)->cverdefs
== 0)
7254 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7258 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7259 s
->flags
|= SEC_EXCLUDE
;
7265 /* Find the first non-excluded output section. We'll use its
7266 section symbol for some emitted relocs. */
7268 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7271 asection
*found
= NULL
;
7273 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7274 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7275 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7278 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7281 elf_hash_table (info
)->text_index_section
= found
;
7284 /* Find two non-excluded output sections, one for code, one for data.
7285 We'll use their section symbols for some emitted relocs. */
7287 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7290 asection
*found
= NULL
;
7292 /* Data first, since setting text_index_section changes
7293 _bfd_elf_omit_section_dynsym_default. */
7294 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7295 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7296 && !(s
->flags
& SEC_READONLY
)
7297 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7300 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7303 elf_hash_table (info
)->data_index_section
= found
;
7305 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7306 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7307 && (s
->flags
& SEC_READONLY
)
7308 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7313 elf_hash_table (info
)->text_index_section
= found
;
7316 #define GNU_HASH_SECTION_NAME(bed) \
7317 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7320 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7322 const struct elf_backend_data
*bed
;
7323 unsigned long section_sym_count
;
7324 bfd_size_type dynsymcount
= 0;
7326 if (!is_elf_hash_table (info
->hash
))
7329 bed
= get_elf_backend_data (output_bfd
);
7330 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7332 /* Assign dynsym indices. In a shared library we generate a section
7333 symbol for each output section, which come first. Next come all
7334 of the back-end allocated local dynamic syms, followed by the rest
7335 of the global symbols.
7337 This is usually not needed for static binaries, however backends
7338 can request to always do it, e.g. the MIPS backend uses dynamic
7339 symbol counts to lay out GOT, which will be produced in the
7340 presence of GOT relocations even in static binaries (holding fixed
7341 data in that case, to satisfy those relocations). */
7343 if (elf_hash_table (info
)->dynamic_sections_created
7344 || bed
->always_renumber_dynsyms
)
7345 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7346 §ion_sym_count
);
7348 if (elf_hash_table (info
)->dynamic_sections_created
)
7352 unsigned int dtagcount
;
7354 dynobj
= elf_hash_table (info
)->dynobj
;
7356 /* Work out the size of the symbol version section. */
7357 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7358 BFD_ASSERT (s
!= NULL
);
7359 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7361 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7362 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7363 if (s
->contents
== NULL
)
7366 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7370 /* Set the size of the .dynsym and .hash sections. We counted
7371 the number of dynamic symbols in elf_link_add_object_symbols.
7372 We will build the contents of .dynsym and .hash when we build
7373 the final symbol table, because until then we do not know the
7374 correct value to give the symbols. We built the .dynstr
7375 section as we went along in elf_link_add_object_symbols. */
7376 s
= elf_hash_table (info
)->dynsym
;
7377 BFD_ASSERT (s
!= NULL
);
7378 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7380 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7381 if (s
->contents
== NULL
)
7384 /* The first entry in .dynsym is a dummy symbol. Clear all the
7385 section syms, in case we don't output them all. */
7386 ++section_sym_count
;
7387 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7389 elf_hash_table (info
)->bucketcount
= 0;
7391 /* Compute the size of the hashing table. As a side effect this
7392 computes the hash values for all the names we export. */
7393 if (info
->emit_hash
)
7395 unsigned long int *hashcodes
;
7396 struct hash_codes_info hashinf
;
7398 unsigned long int nsyms
;
7400 size_t hash_entry_size
;
7402 /* Compute the hash values for all exported symbols. At the same
7403 time store the values in an array so that we could use them for
7405 amt
= dynsymcount
* sizeof (unsigned long int);
7406 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7407 if (hashcodes
== NULL
)
7409 hashinf
.hashcodes
= hashcodes
;
7410 hashinf
.error
= false;
7412 /* Put all hash values in HASHCODES. */
7413 elf_link_hash_traverse (elf_hash_table (info
),
7414 elf_collect_hash_codes
, &hashinf
);
7421 nsyms
= hashinf
.hashcodes
- hashcodes
;
7423 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7426 if (bucketcount
== 0 && nsyms
> 0)
7429 elf_hash_table (info
)->bucketcount
= bucketcount
;
7431 s
= bfd_get_linker_section (dynobj
, ".hash");
7432 BFD_ASSERT (s
!= NULL
);
7433 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7434 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7435 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7436 if (s
->contents
== NULL
)
7439 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7440 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7441 s
->contents
+ hash_entry_size
);
7444 if (info
->emit_gnu_hash
)
7447 unsigned char *contents
;
7448 struct collect_gnu_hash_codes cinfo
;
7452 memset (&cinfo
, 0, sizeof (cinfo
));
7454 /* Compute the hash values for all exported symbols. At the same
7455 time store the values in an array so that we could use them for
7457 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7458 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7459 if (cinfo
.hashcodes
== NULL
)
7462 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7463 cinfo
.min_dynindx
= -1;
7464 cinfo
.output_bfd
= output_bfd
;
7467 /* Put all hash values in HASHCODES. */
7468 elf_link_hash_traverse (elf_hash_table (info
),
7469 elf_collect_gnu_hash_codes
, &cinfo
);
7472 free (cinfo
.hashcodes
);
7477 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7479 if (bucketcount
== 0)
7481 free (cinfo
.hashcodes
);
7485 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7486 BFD_ASSERT (s
!= NULL
);
7488 if (cinfo
.nsyms
== 0)
7490 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7491 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7492 free (cinfo
.hashcodes
);
7493 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7494 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7495 if (contents
== NULL
)
7497 s
->contents
= contents
;
7498 /* 1 empty bucket. */
7499 bfd_put_32 (output_bfd
, 1, contents
);
7500 /* SYMIDX above the special symbol 0. */
7501 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7502 /* Just one word for bitmask. */
7503 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7504 /* Only hash fn bloom filter. */
7505 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7506 /* No hashes are valid - empty bitmask. */
7507 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7508 /* No hashes in the only bucket. */
7509 bfd_put_32 (output_bfd
, 0,
7510 contents
+ 16 + bed
->s
->arch_size
/ 8);
7514 unsigned long int maskwords
, maskbitslog2
, x
;
7515 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7519 while ((x
>>= 1) != 0)
7521 if (maskbitslog2
< 3)
7523 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7524 maskbitslog2
= maskbitslog2
+ 3;
7526 maskbitslog2
= maskbitslog2
+ 2;
7527 if (bed
->s
->arch_size
== 64)
7529 if (maskbitslog2
== 5)
7535 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7536 cinfo
.shift2
= maskbitslog2
;
7537 cinfo
.maskbits
= 1 << maskbitslog2
;
7538 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7539 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7540 amt
+= maskwords
* sizeof (bfd_vma
);
7541 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7542 if (cinfo
.bitmask
== NULL
)
7544 free (cinfo
.hashcodes
);
7548 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7549 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7550 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7551 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7553 /* Determine how often each hash bucket is used. */
7554 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7555 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7556 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7558 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7559 if (cinfo
.counts
[i
] != 0)
7561 cinfo
.indx
[i
] = cnt
;
7562 cnt
+= cinfo
.counts
[i
];
7564 BFD_ASSERT (cnt
== dynsymcount
);
7565 cinfo
.bucketcount
= bucketcount
;
7566 cinfo
.local_indx
= cinfo
.min_dynindx
;
7568 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7569 s
->size
+= cinfo
.maskbits
/ 8;
7570 if (bed
->record_xhash_symbol
!= NULL
)
7571 s
->size
+= cinfo
.nsyms
* 4;
7572 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7573 if (contents
== NULL
)
7575 free (cinfo
.bitmask
);
7576 free (cinfo
.hashcodes
);
7580 s
->contents
= contents
;
7581 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7582 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7583 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7584 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7585 contents
+= 16 + cinfo
.maskbits
/ 8;
7587 for (i
= 0; i
< bucketcount
; ++i
)
7589 if (cinfo
.counts
[i
] == 0)
7590 bfd_put_32 (output_bfd
, 0, contents
);
7592 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7596 cinfo
.contents
= contents
;
7598 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7599 /* Renumber dynamic symbols, if populating .gnu.hash section.
7600 If using .MIPS.xhash, populate the translation table. */
7601 elf_link_hash_traverse (elf_hash_table (info
),
7602 elf_gnu_hash_process_symidx
, &cinfo
);
7604 contents
= s
->contents
+ 16;
7605 for (i
= 0; i
< maskwords
; ++i
)
7607 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7609 contents
+= bed
->s
->arch_size
/ 8;
7612 free (cinfo
.bitmask
);
7613 free (cinfo
.hashcodes
);
7617 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7618 BFD_ASSERT (s
!= NULL
);
7620 elf_finalize_dynstr (output_bfd
, info
);
7622 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7624 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7625 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7632 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7635 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7638 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7639 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7642 /* Finish SHF_MERGE section merging. */
7645 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7650 if (!is_elf_hash_table (info
->hash
))
7653 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7654 if ((ibfd
->flags
& DYNAMIC
) == 0
7655 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7656 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7657 == get_elf_backend_data (obfd
)->s
->elfclass
))
7658 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7659 if ((sec
->flags
& SEC_MERGE
) != 0
7660 && !bfd_is_abs_section (sec
->output_section
))
7662 struct bfd_elf_section_data
*secdata
;
7664 secdata
= elf_section_data (sec
);
7665 if (! _bfd_add_merge_section (obfd
,
7666 &elf_hash_table (info
)->merge_info
,
7667 sec
, &secdata
->sec_info
))
7669 else if (secdata
->sec_info
)
7670 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7673 if (elf_hash_table (info
)->merge_info
!= NULL
)
7674 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7675 merge_sections_remove_hook
);
7679 /* Create an entry in an ELF linker hash table. */
7681 struct bfd_hash_entry
*
7682 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7683 struct bfd_hash_table
*table
,
7686 /* Allocate the structure if it has not already been allocated by a
7690 entry
= (struct bfd_hash_entry
*)
7691 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7696 /* Call the allocation method of the superclass. */
7697 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7700 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7701 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7703 /* Set local fields. */
7706 ret
->got
= htab
->init_got_refcount
;
7707 ret
->plt
= htab
->init_plt_refcount
;
7708 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7709 - offsetof (struct elf_link_hash_entry
, size
)));
7710 /* Assume that we have been called by a non-ELF symbol reader.
7711 This flag is then reset by the code which reads an ELF input
7712 file. This ensures that a symbol created by a non-ELF symbol
7713 reader will have the flag set correctly. */
7720 /* Copy data from an indirect symbol to its direct symbol, hiding the
7721 old indirect symbol. Also used for copying flags to a weakdef. */
7724 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7725 struct elf_link_hash_entry
*dir
,
7726 struct elf_link_hash_entry
*ind
)
7728 struct elf_link_hash_table
*htab
;
7730 if (ind
->dyn_relocs
!= NULL
)
7732 if (dir
->dyn_relocs
!= NULL
)
7734 struct elf_dyn_relocs
**pp
;
7735 struct elf_dyn_relocs
*p
;
7737 /* Add reloc counts against the indirect sym to the direct sym
7738 list. Merge any entries against the same section. */
7739 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7741 struct elf_dyn_relocs
*q
;
7743 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7744 if (q
->sec
== p
->sec
)
7746 q
->pc_count
+= p
->pc_count
;
7747 q
->count
+= p
->count
;
7754 *pp
= dir
->dyn_relocs
;
7757 dir
->dyn_relocs
= ind
->dyn_relocs
;
7758 ind
->dyn_relocs
= NULL
;
7761 /* Copy down any references that we may have already seen to the
7762 symbol which just became indirect. */
7764 if (dir
->versioned
!= versioned_hidden
)
7765 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7766 dir
->ref_regular
|= ind
->ref_regular
;
7767 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7768 dir
->non_got_ref
|= ind
->non_got_ref
;
7769 dir
->needs_plt
|= ind
->needs_plt
;
7770 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7772 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7775 /* Copy over the global and procedure linkage table refcount entries.
7776 These may have been already set up by a check_relocs routine. */
7777 htab
= elf_hash_table (info
);
7778 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7780 if (dir
->got
.refcount
< 0)
7781 dir
->got
.refcount
= 0;
7782 dir
->got
.refcount
+= ind
->got
.refcount
;
7783 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7786 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7788 if (dir
->plt
.refcount
< 0)
7789 dir
->plt
.refcount
= 0;
7790 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7791 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7794 if (ind
->dynindx
!= -1)
7796 if (dir
->dynindx
!= -1)
7797 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7798 dir
->dynindx
= ind
->dynindx
;
7799 dir
->dynstr_index
= ind
->dynstr_index
;
7801 ind
->dynstr_index
= 0;
7806 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7807 struct elf_link_hash_entry
*h
,
7810 /* STT_GNU_IFUNC symbol must go through PLT. */
7811 if (h
->type
!= STT_GNU_IFUNC
)
7813 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7818 h
->forced_local
= 1;
7819 if (h
->dynindx
!= -1)
7821 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7824 h
->dynstr_index
= 0;
7829 /* Hide a symbol. */
7832 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7833 struct bfd_link_info
*info
,
7834 struct bfd_link_hash_entry
*h
)
7836 if (is_elf_hash_table (info
->hash
))
7838 const struct elf_backend_data
*bed
7839 = get_elf_backend_data (output_bfd
);
7840 struct elf_link_hash_entry
*eh
7841 = (struct elf_link_hash_entry
*) h
;
7842 bed
->elf_backend_hide_symbol (info
, eh
, true);
7843 eh
->def_dynamic
= 0;
7844 eh
->ref_dynamic
= 0;
7845 eh
->dynamic_def
= 0;
7849 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7853 _bfd_elf_link_hash_table_init
7854 (struct elf_link_hash_table
*table
,
7856 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7857 struct bfd_hash_table
*,
7859 unsigned int entsize
,
7860 enum elf_target_id target_id
)
7863 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7865 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7866 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7867 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7868 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7869 /* The first dynamic symbol is a dummy. */
7870 table
->dynsymcount
= 1;
7872 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7874 table
->root
.type
= bfd_link_elf_hash_table
;
7875 table
->hash_table_id
= target_id
;
7876 table
->target_os
= get_elf_backend_data (abfd
)->target_os
;
7881 /* Create an ELF linker hash table. */
7883 struct bfd_link_hash_table
*
7884 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7886 struct elf_link_hash_table
*ret
;
7887 size_t amt
= sizeof (struct elf_link_hash_table
);
7889 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7893 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7894 sizeof (struct elf_link_hash_entry
),
7900 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7905 /* Destroy an ELF linker hash table. */
7908 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7910 struct elf_link_hash_table
*htab
;
7912 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7913 if (htab
->dynstr
!= NULL
)
7914 _bfd_elf_strtab_free (htab
->dynstr
);
7915 _bfd_merge_sections_free (htab
->merge_info
);
7916 _bfd_generic_link_hash_table_free (obfd
);
7919 /* This is a hook for the ELF emulation code in the generic linker to
7920 tell the backend linker what file name to use for the DT_NEEDED
7921 entry for a dynamic object. */
7924 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7926 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7927 && bfd_get_format (abfd
) == bfd_object
)
7928 elf_dt_name (abfd
) = name
;
7932 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7935 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7936 && bfd_get_format (abfd
) == bfd_object
)
7937 lib_class
= elf_dyn_lib_class (abfd
);
7944 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7946 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7947 && bfd_get_format (abfd
) == bfd_object
)
7948 elf_dyn_lib_class (abfd
) = lib_class
;
7951 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7952 the linker ELF emulation code. */
7954 struct bfd_link_needed_list
*
7955 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7956 struct bfd_link_info
*info
)
7958 if (! is_elf_hash_table (info
->hash
))
7960 return elf_hash_table (info
)->needed
;
7963 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7964 hook for the linker ELF emulation code. */
7966 struct bfd_link_needed_list
*
7967 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7968 struct bfd_link_info
*info
)
7970 if (! is_elf_hash_table (info
->hash
))
7972 return elf_hash_table (info
)->runpath
;
7975 /* Get the name actually used for a dynamic object for a link. This
7976 is the SONAME entry if there is one. Otherwise, it is the string
7977 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7980 bfd_elf_get_dt_soname (bfd
*abfd
)
7982 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7983 && bfd_get_format (abfd
) == bfd_object
)
7984 return elf_dt_name (abfd
);
7988 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7989 the ELF linker emulation code. */
7992 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7993 struct bfd_link_needed_list
**pneeded
)
7996 bfd_byte
*dynbuf
= NULL
;
7997 unsigned int elfsec
;
7998 unsigned long shlink
;
7999 bfd_byte
*extdyn
, *extdynend
;
8001 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
8005 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
8006 || bfd_get_format (abfd
) != bfd_object
)
8009 s
= bfd_get_section_by_name (abfd
, ".dynamic");
8010 if (s
== NULL
|| s
->size
== 0)
8013 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
8016 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
8017 if (elfsec
== SHN_BAD
)
8020 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
8022 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
8023 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
8026 extdynend
= extdyn
+ s
->size
;
8027 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
8029 Elf_Internal_Dyn dyn
;
8031 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
8033 if (dyn
.d_tag
== DT_NULL
)
8036 if (dyn
.d_tag
== DT_NEEDED
)
8039 struct bfd_link_needed_list
*l
;
8040 unsigned int tagv
= dyn
.d_un
.d_val
;
8043 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
8048 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
8068 struct elf_symbuf_symbol
8070 unsigned long st_name
; /* Symbol name, index in string tbl */
8071 unsigned char st_info
; /* Type and binding attributes */
8072 unsigned char st_other
; /* Visibilty, and target specific */
8075 struct elf_symbuf_head
8077 struct elf_symbuf_symbol
*ssym
;
8079 unsigned int st_shndx
;
8086 Elf_Internal_Sym
*isym
;
8087 struct elf_symbuf_symbol
*ssym
;
8093 /* Sort references to symbols by ascending section number. */
8096 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8098 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8099 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8101 if (s1
->st_shndx
!= s2
->st_shndx
)
8102 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8103 /* Final sort by the address of the sym in the symbuf ensures
8106 return s1
> s2
? 1 : -1;
8111 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8113 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8114 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8115 int ret
= strcmp (s1
->name
, s2
->name
);
8118 if (s1
->u
.p
!= s2
->u
.p
)
8119 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8123 static struct elf_symbuf_head
*
8124 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8126 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8127 struct elf_symbuf_symbol
*ssym
;
8128 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8129 size_t i
, shndx_count
, total_size
, amt
;
8131 amt
= symcount
* sizeof (*indbuf
);
8132 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8136 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8137 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
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
, sec_count1
, sec_count2
, i
;
8201 unsigned int shndx1
, shndx2
;
8203 bool ignore_section_symbol_p
;
8208 /* Both sections have to be in ELF. */
8209 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8210 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8213 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8216 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8217 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8218 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8221 bed1
= get_elf_backend_data (bfd1
);
8222 bed2
= get_elf_backend_data (bfd2
);
8223 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8224 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8225 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8226 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8228 if (symcount1
== 0 || symcount2
== 0)
8234 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8235 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8237 /* Ignore section symbols only when matching non-debugging sections
8238 or linkonce section with comdat section. */
8239 ignore_section_symbol_p
8240 = ((sec1
->flags
& SEC_DEBUGGING
) == 0
8241 || ((elf_section_flags (sec1
) & SHF_GROUP
)
8242 != (elf_section_flags (sec2
) & SHF_GROUP
)));
8244 if (ssymbuf1
== NULL
)
8246 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8248 if (isymbuf1
== NULL
)
8251 if (info
!= NULL
&& !info
->reduce_memory_overheads
)
8253 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8254 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8258 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8260 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8262 if (isymbuf2
== NULL
)
8265 if (ssymbuf1
!= NULL
&& info
!= NULL
&& !info
->reduce_memory_overheads
)
8267 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8268 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8272 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8274 /* Optimized faster version. */
8276 struct elf_symbol
*symp
;
8277 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8280 hi
= ssymbuf1
->count
;
8286 mid
= (lo
+ hi
) / 2;
8287 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8289 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8293 count1
= ssymbuf1
[mid
].count
;
8298 if (ignore_section_symbol_p
)
8300 for (i
= 0; i
< count1
; i
++)
8301 if (ELF_ST_TYPE (ssymbuf1
->ssym
[i
].st_info
) == STT_SECTION
)
8303 count1
-= sec_count1
;
8307 hi
= ssymbuf2
->count
;
8313 mid
= (lo
+ hi
) / 2;
8314 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8316 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8320 count2
= ssymbuf2
[mid
].count
;
8325 if (ignore_section_symbol_p
)
8327 for (i
= 0; i
< count2
; i
++)
8328 if (ELF_ST_TYPE (ssymbuf2
->ssym
[i
].st_info
) == STT_SECTION
)
8330 count2
-= sec_count2
;
8333 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8337 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8339 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8340 if (symtable1
== NULL
|| symtable2
== NULL
)
8344 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
+ sec_count1
;
8345 ssym
< ssymend
; ssym
++)
8347 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8349 symp
->u
.ssym
= ssym
;
8350 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8357 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
+ sec_count2
;
8358 ssym
< ssymend
; ssym
++)
8360 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8362 symp
->u
.ssym
= ssym
;
8363 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8369 /* Sort symbol by name. */
8370 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8371 elf_sym_name_compare
);
8372 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8373 elf_sym_name_compare
);
8375 for (i
= 0; i
< count1
; i
++)
8376 /* Two symbols must have the same binding, type and name. */
8377 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8378 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8379 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8386 symtable1
= (struct elf_symbol
*)
8387 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8388 symtable2
= (struct elf_symbol
*)
8389 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8390 if (symtable1
== NULL
|| symtable2
== NULL
)
8393 /* Count definitions in the section. */
8395 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8396 if (isym
->st_shndx
== shndx1
8397 && (!ignore_section_symbol_p
8398 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8399 symtable1
[count1
++].u
.isym
= isym
;
8402 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8403 if (isym
->st_shndx
== shndx2
8404 && (!ignore_section_symbol_p
8405 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8406 symtable2
[count2
++].u
.isym
= isym
;
8408 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8411 for (i
= 0; i
< count1
; i
++)
8413 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8414 symtable1
[i
].u
.isym
->st_name
);
8416 for (i
= 0; i
< count2
; i
++)
8418 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8419 symtable2
[i
].u
.isym
->st_name
);
8421 /* Sort symbol by name. */
8422 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8423 elf_sym_name_compare
);
8424 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8425 elf_sym_name_compare
);
8427 for (i
= 0; i
< count1
; i
++)
8428 /* Two symbols must have the same binding, type and name. */
8429 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8430 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8431 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8445 /* Return TRUE if 2 section types are compatible. */
8448 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8449 bfd
*bbfd
, const asection
*bsec
)
8453 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8454 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8457 return elf_section_type (asec
) == elf_section_type (bsec
);
8460 /* Final phase of ELF linker. */
8462 /* A structure we use to avoid passing large numbers of arguments. */
8464 struct elf_final_link_info
8466 /* General link information. */
8467 struct bfd_link_info
*info
;
8470 /* Symbol string table. */
8471 struct elf_strtab_hash
*symstrtab
;
8472 /* .hash section. */
8474 /* symbol version section (.gnu.version). */
8475 asection
*symver_sec
;
8476 /* Buffer large enough to hold contents of any section. */
8478 /* Buffer large enough to hold external relocs of any section. */
8479 void *external_relocs
;
8480 /* Buffer large enough to hold internal relocs of any section. */
8481 Elf_Internal_Rela
*internal_relocs
;
8482 /* Buffer large enough to hold external local symbols of any input
8484 bfd_byte
*external_syms
;
8485 /* And a buffer for symbol section indices. */
8486 Elf_External_Sym_Shndx
*locsym_shndx
;
8487 /* Buffer large enough to hold internal local symbols of any input
8489 Elf_Internal_Sym
*internal_syms
;
8490 /* Array large enough to hold a symbol index for each local symbol
8491 of any input BFD. */
8493 /* Array large enough to hold a section pointer for each local
8494 symbol of any input BFD. */
8495 asection
**sections
;
8496 /* Buffer for SHT_SYMTAB_SHNDX section. */
8497 Elf_External_Sym_Shndx
*symshndxbuf
;
8498 /* Number of STT_FILE syms seen. */
8499 size_t filesym_count
;
8500 /* Local symbol hash table. */
8501 struct bfd_hash_table local_hash_table
;
8504 struct local_hash_entry
8506 /* Base hash table entry structure. */
8507 struct bfd_hash_entry root
;
8508 /* Size of the local symbol name. */
8510 /* Number of the duplicated local symbol names. */
8514 /* Create an entry in the local symbol hash table. */
8516 static struct bfd_hash_entry
*
8517 local_hash_newfunc (struct bfd_hash_entry
*entry
,
8518 struct bfd_hash_table
*table
,
8522 /* Allocate the structure if it has not already been allocated by a
8526 entry
= bfd_hash_allocate (table
,
8527 sizeof (struct local_hash_entry
));
8532 /* Call the allocation method of the superclass. */
8533 entry
= bfd_hash_newfunc (entry
, table
, string
);
8536 ((struct local_hash_entry
*) entry
)->count
= 0;
8537 ((struct local_hash_entry
*) entry
)->size
= 0;
8543 /* This struct is used to pass information to elf_link_output_extsym. */
8545 struct elf_outext_info
8550 struct elf_final_link_info
*flinfo
;
8554 /* Support for evaluating a complex relocation.
8556 Complex relocations are generalized, self-describing relocations. The
8557 implementation of them consists of two parts: complex symbols, and the
8558 relocations themselves.
8560 The relocations use a reserved elf-wide relocation type code (R_RELC
8561 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8562 information (start bit, end bit, word width, etc) into the addend. This
8563 information is extracted from CGEN-generated operand tables within gas.
8565 Complex symbols are mangled symbols (STT_RELC external / BSF_RELC
8566 internal) representing prefix-notation expressions, including but not
8567 limited to those sorts of expressions normally encoded as addends in the
8568 addend field. The symbol mangling format is:
8571 | <unary-operator> ':' <node>
8572 | <binary-operator> ':' <node> ':' <node>
8575 <literal> := 's' <digits=N> ':' <N character symbol name>
8576 | 'S' <digits=N> ':' <N character section name>
8580 <binary-operator> := as in C
8581 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8584 set_symbol_value (bfd
*bfd_with_globals
,
8585 Elf_Internal_Sym
*isymbuf
,
8590 struct elf_link_hash_entry
**sym_hashes
;
8591 struct elf_link_hash_entry
*h
;
8592 size_t extsymoff
= locsymcount
;
8594 if (symidx
< locsymcount
)
8596 Elf_Internal_Sym
*sym
;
8598 sym
= isymbuf
+ symidx
;
8599 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8601 /* It is a local symbol: move it to the
8602 "absolute" section and give it a value. */
8603 sym
->st_shndx
= SHN_ABS
;
8604 sym
->st_value
= val
;
8607 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8611 /* It is a global symbol: set its link type
8612 to "defined" and give it a value. */
8614 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8615 h
= sym_hashes
[symidx
- extsymoff
];
8616 while (h
->root
.type
== bfd_link_hash_indirect
8617 || h
->root
.type
== bfd_link_hash_warning
)
8618 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8619 h
->root
.type
= bfd_link_hash_defined
;
8620 h
->root
.u
.def
.value
= val
;
8621 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8625 resolve_symbol (const char *name
,
8627 struct elf_final_link_info
*flinfo
,
8629 Elf_Internal_Sym
*isymbuf
,
8632 Elf_Internal_Sym
*sym
;
8633 struct bfd_link_hash_entry
*global_entry
;
8634 const char *candidate
= NULL
;
8635 Elf_Internal_Shdr
*symtab_hdr
;
8638 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8640 for (i
= 0; i
< locsymcount
; ++ i
)
8644 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8647 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8648 symtab_hdr
->sh_link
,
8651 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8652 name
, candidate
, (unsigned long) sym
->st_value
);
8654 if (candidate
&& strcmp (candidate
, name
) == 0)
8656 asection
*sec
= flinfo
->sections
[i
];
8658 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8659 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8661 printf ("Found symbol with value %8.8lx\n",
8662 (unsigned long) *result
);
8668 /* Hmm, haven't found it yet. perhaps it is a global. */
8669 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8670 false, false, true);
8674 if (global_entry
->type
== bfd_link_hash_defined
8675 || global_entry
->type
== bfd_link_hash_defweak
)
8677 *result
= (global_entry
->u
.def
.value
8678 + global_entry
->u
.def
.section
->output_section
->vma
8679 + global_entry
->u
.def
.section
->output_offset
);
8681 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8682 global_entry
->root
.string
, (unsigned long) *result
);
8690 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8691 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8692 names like "foo.end" which is the end address of section "foo". */
8695 resolve_section (const char *name
,
8703 for (curr
= sections
; curr
; curr
= curr
->next
)
8704 if (strcmp (curr
->name
, name
) == 0)
8706 *result
= curr
->vma
;
8710 /* Hmm. still haven't found it. try pseudo-section names. */
8711 /* FIXME: This could be coded more efficiently... */
8712 for (curr
= sections
; curr
; curr
= curr
->next
)
8714 len
= strlen (curr
->name
);
8715 if (len
> strlen (name
))
8718 if (strncmp (curr
->name
, name
, len
) == 0)
8720 if (startswith (name
+ len
, ".end"))
8722 *result
= (curr
->vma
8723 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8727 /* Insert more pseudo-section names here, if you like. */
8735 undefined_reference (const char *reftype
, const char *name
)
8737 /* xgettext:c-format */
8738 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8740 bfd_set_error (bfd_error_bad_value
);
8744 eval_symbol (bfd_vma
*result
,
8747 struct elf_final_link_info
*flinfo
,
8749 Elf_Internal_Sym
*isymbuf
,
8758 const char *sym
= *symp
;
8760 bool symbol_is_section
= false;
8765 if (len
< 1 || len
> sizeof (symbuf
))
8767 bfd_set_error (bfd_error_invalid_operation
);
8780 *result
= strtoul (sym
, (char **) symp
, 16);
8784 symbol_is_section
= true;
8788 symlen
= strtol (sym
, (char **) symp
, 10);
8789 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8791 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8793 bfd_set_error (bfd_error_invalid_operation
);
8797 memcpy (symbuf
, sym
, symlen
);
8798 symbuf
[symlen
] = '\0';
8799 *symp
= sym
+ symlen
;
8801 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8802 the symbol as a section, or vice-versa. so we're pretty liberal in our
8803 interpretation here; section means "try section first", not "must be a
8804 section", and likewise with symbol. */
8806 if (symbol_is_section
)
8808 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8809 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8810 isymbuf
, locsymcount
))
8812 undefined_reference ("section", symbuf
);
8818 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8819 isymbuf
, locsymcount
)
8820 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8823 undefined_reference ("symbol", symbuf
);
8830 /* All that remains are operators. */
8832 #define UNARY_OP(op) \
8833 if (startswith (sym, #op)) \
8835 sym += strlen (#op); \
8839 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8840 isymbuf, locsymcount, signed_p)) \
8843 *result = op ((bfd_signed_vma) a); \
8849 #define BINARY_OP_HEAD(op) \
8850 if (startswith (sym, #op)) \
8852 sym += strlen (#op); \
8856 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8857 isymbuf, locsymcount, signed_p)) \
8860 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8861 isymbuf, locsymcount, signed_p)) \
8863 #define BINARY_OP_TAIL(op) \
8865 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8870 #define BINARY_OP(op) BINARY_OP_HEAD(op) BINARY_OP_TAIL(op)
8874 BINARY_OP_HEAD (<<);
8875 if (b
>= sizeof (a
) * CHAR_BIT
)
8881 BINARY_OP_TAIL (<<);
8882 BINARY_OP_HEAD (>>);
8883 if (b
>= sizeof (a
) * CHAR_BIT
)
8885 *result
= signed_p
&& (bfd_signed_vma
) a
< 0 ? -1 : 0;
8888 BINARY_OP_TAIL (>>);
8901 _bfd_error_handler (_("division by zero"));
8902 bfd_set_error (bfd_error_bad_value
);
8909 _bfd_error_handler (_("division by zero"));
8910 bfd_set_error (bfd_error_bad_value
);
8923 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8924 bfd_set_error (bfd_error_invalid_operation
);
8930 put_value (bfd_vma size
,
8931 unsigned long chunksz
,
8936 location
+= (size
- chunksz
);
8938 for (; size
; size
-= chunksz
, location
-= chunksz
)
8943 bfd_put_8 (input_bfd
, x
, location
);
8947 bfd_put_16 (input_bfd
, x
, location
);
8951 bfd_put_32 (input_bfd
, x
, location
);
8952 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8958 bfd_put_64 (input_bfd
, x
, location
);
8959 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8972 get_value (bfd_vma size
,
8973 unsigned long chunksz
,
8980 /* Sanity checks. */
8981 BFD_ASSERT (chunksz
<= sizeof (x
)
8984 && (size
% chunksz
) == 0
8985 && input_bfd
!= NULL
8986 && location
!= NULL
);
8988 if (chunksz
== sizeof (x
))
8990 BFD_ASSERT (size
== chunksz
);
8992 /* Make sure that we do not perform an undefined shift operation.
8993 We know that size == chunksz so there will only be one iteration
8994 of the loop below. */
8998 shift
= 8 * chunksz
;
9000 for (; size
; size
-= chunksz
, location
+= chunksz
)
9005 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
9008 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
9011 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
9015 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
9026 decode_complex_addend (unsigned long *start
, /* in bits */
9027 unsigned long *oplen
, /* in bits */
9028 unsigned long *len
, /* in bits */
9029 unsigned long *wordsz
, /* in bytes */
9030 unsigned long *chunksz
, /* in bytes */
9031 unsigned long *lsb0_p
,
9032 unsigned long *signed_p
,
9033 unsigned long *trunc_p
,
9034 unsigned long encoded
)
9036 * start
= encoded
& 0x3F;
9037 * len
= (encoded
>> 6) & 0x3F;
9038 * oplen
= (encoded
>> 12) & 0x3F;
9039 * wordsz
= (encoded
>> 18) & 0xF;
9040 * chunksz
= (encoded
>> 22) & 0xF;
9041 * lsb0_p
= (encoded
>> 27) & 1;
9042 * signed_p
= (encoded
>> 28) & 1;
9043 * trunc_p
= (encoded
>> 29) & 1;
9046 bfd_reloc_status_type
9047 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
9048 asection
*input_section
,
9050 Elf_Internal_Rela
*rel
,
9053 bfd_vma shift
, x
, mask
;
9054 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
9055 bfd_reloc_status_type r
;
9056 bfd_size_type octets
;
9058 /* Perform this reloc, since it is complex.
9059 (this is not to say that it necessarily refers to a complex
9060 symbol; merely that it is a self-describing CGEN based reloc.
9061 i.e. the addend has the complete reloc information (bit start, end,
9062 word size, etc) encoded within it.). */
9064 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
9065 &chunksz
, &lsb0_p
, &signed_p
,
9066 &trunc_p
, rel
->r_addend
);
9068 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
9071 shift
= (start
+ 1) - len
;
9073 shift
= (8 * wordsz
) - (start
+ len
);
9075 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
9076 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
9079 printf ("Doing complex reloc: "
9080 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
9081 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
9082 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
9083 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
9084 oplen
, (unsigned long) x
, (unsigned long) mask
,
9085 (unsigned long) relocation
);
9090 /* Now do an overflow check. */
9091 r
= bfd_check_overflow ((signed_p
9092 ? complain_overflow_signed
9093 : complain_overflow_unsigned
),
9094 len
, 0, (8 * wordsz
),
9098 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
9101 printf (" relocation: %8.8lx\n"
9102 " shifted mask: %8.8lx\n"
9103 " shifted/masked reloc: %8.8lx\n"
9104 " result: %8.8lx\n",
9105 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
9106 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
9108 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
9112 /* Functions to read r_offset from external (target order) reloc
9113 entry. Faster than bfd_getl32 et al, because we let the compiler
9114 know the value is aligned. */
9117 ext32l_r_offset (const void *p
)
9124 const union aligned32
*a
9125 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9127 uint32_t aval
= ( (uint32_t) a
->c
[0]
9128 | (uint32_t) a
->c
[1] << 8
9129 | (uint32_t) a
->c
[2] << 16
9130 | (uint32_t) a
->c
[3] << 24);
9135 ext32b_r_offset (const void *p
)
9142 const union aligned32
*a
9143 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9145 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
9146 | (uint32_t) a
->c
[1] << 16
9147 | (uint32_t) a
->c
[2] << 8
9148 | (uint32_t) a
->c
[3]);
9152 #ifdef BFD_HOST_64_BIT
9154 ext64l_r_offset (const void *p
)
9161 const union aligned64
*a
9162 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9164 uint64_t aval
= ( (uint64_t) a
->c
[0]
9165 | (uint64_t) a
->c
[1] << 8
9166 | (uint64_t) a
->c
[2] << 16
9167 | (uint64_t) a
->c
[3] << 24
9168 | (uint64_t) a
->c
[4] << 32
9169 | (uint64_t) a
->c
[5] << 40
9170 | (uint64_t) a
->c
[6] << 48
9171 | (uint64_t) a
->c
[7] << 56);
9176 ext64b_r_offset (const void *p
)
9183 const union aligned64
*a
9184 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9186 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9187 | (uint64_t) a
->c
[1] << 48
9188 | (uint64_t) a
->c
[2] << 40
9189 | (uint64_t) a
->c
[3] << 32
9190 | (uint64_t) a
->c
[4] << 24
9191 | (uint64_t) a
->c
[5] << 16
9192 | (uint64_t) a
->c
[6] << 8
9193 | (uint64_t) a
->c
[7]);
9198 /* When performing a relocatable link, the input relocations are
9199 preserved. But, if they reference global symbols, the indices
9200 referenced must be updated. Update all the relocations found in
9204 elf_link_adjust_relocs (bfd
*abfd
,
9206 struct bfd_elf_section_reloc_data
*reldata
,
9208 struct bfd_link_info
*info
)
9211 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9213 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9214 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9215 bfd_vma r_type_mask
;
9217 unsigned int count
= reldata
->count
;
9218 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9220 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9222 swap_in
= bed
->s
->swap_reloc_in
;
9223 swap_out
= bed
->s
->swap_reloc_out
;
9225 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9227 swap_in
= bed
->s
->swap_reloca_in
;
9228 swap_out
= bed
->s
->swap_reloca_out
;
9233 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9236 if (bed
->s
->arch_size
== 32)
9243 r_type_mask
= 0xffffffff;
9247 erela
= reldata
->hdr
->contents
;
9248 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9250 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9253 if (*rel_hash
== NULL
)
9256 if ((*rel_hash
)->indx
== -2
9257 && info
->gc_sections
9258 && ! info
->gc_keep_exported
)
9260 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9261 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9263 (*rel_hash
)->root
.root
.string
);
9264 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9266 bfd_set_error (bfd_error_invalid_operation
);
9269 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9271 (*swap_in
) (abfd
, erela
, irela
);
9272 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9273 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9274 | (irela
[j
].r_info
& r_type_mask
));
9275 (*swap_out
) (abfd
, irela
, erela
);
9278 if (bed
->elf_backend_update_relocs
)
9279 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9281 if (sort
&& count
!= 0)
9283 bfd_vma (*ext_r_off
) (const void *);
9286 bfd_byte
*base
, *end
, *p
, *loc
;
9287 bfd_byte
*buf
= NULL
;
9289 if (bed
->s
->arch_size
== 32)
9291 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9292 ext_r_off
= ext32l_r_offset
;
9293 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9294 ext_r_off
= ext32b_r_offset
;
9300 #ifdef BFD_HOST_64_BIT
9301 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9302 ext_r_off
= ext64l_r_offset
;
9303 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9304 ext_r_off
= ext64b_r_offset
;
9310 /* Must use a stable sort here. A modified insertion sort,
9311 since the relocs are mostly sorted already. */
9312 elt_size
= reldata
->hdr
->sh_entsize
;
9313 base
= reldata
->hdr
->contents
;
9314 end
= base
+ count
* elt_size
;
9315 if (elt_size
> sizeof (Elf64_External_Rela
))
9318 /* Ensure the first element is lowest. This acts as a sentinel,
9319 speeding the main loop below. */
9320 r_off
= (*ext_r_off
) (base
);
9321 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9323 bfd_vma r_off2
= (*ext_r_off
) (p
);
9332 /* Don't just swap *base and *loc as that changes the order
9333 of the original base[0] and base[1] if they happen to
9334 have the same r_offset. */
9335 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9336 memcpy (onebuf
, loc
, elt_size
);
9337 memmove (base
+ elt_size
, base
, loc
- base
);
9338 memcpy (base
, onebuf
, elt_size
);
9341 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9343 /* base to p is sorted, *p is next to insert. */
9344 r_off
= (*ext_r_off
) (p
);
9345 /* Search the sorted region for location to insert. */
9347 while (r_off
< (*ext_r_off
) (loc
))
9352 /* Chances are there is a run of relocs to insert here,
9353 from one of more input files. Files are not always
9354 linked in order due to the way elf_link_input_bfd is
9355 called. See pr17666. */
9356 size_t sortlen
= p
- loc
;
9357 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9358 size_t runlen
= elt_size
;
9359 size_t buf_size
= 96 * 1024;
9360 while (p
+ runlen
< end
9361 && (sortlen
<= buf_size
9362 || runlen
+ elt_size
<= buf_size
)
9363 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9367 buf
= bfd_malloc (buf_size
);
9371 if (runlen
< sortlen
)
9373 memcpy (buf
, p
, runlen
);
9374 memmove (loc
+ runlen
, loc
, sortlen
);
9375 memcpy (loc
, buf
, runlen
);
9379 memcpy (buf
, loc
, sortlen
);
9380 memmove (loc
, p
, runlen
);
9381 memcpy (loc
+ runlen
, buf
, sortlen
);
9383 p
+= runlen
- elt_size
;
9386 /* Hashes are no longer valid. */
9387 free (reldata
->hashes
);
9388 reldata
->hashes
= NULL
;
9394 struct elf_link_sort_rela
9400 enum elf_reloc_type_class type
;
9401 /* We use this as an array of size int_rels_per_ext_rel. */
9402 Elf_Internal_Rela rela
[1];
9405 /* qsort stability here and for cmp2 is only an issue if multiple
9406 dynamic relocations are emitted at the same address. But targets
9407 that apply a series of dynamic relocations each operating on the
9408 result of the prior relocation can't use -z combreloc as
9409 implemented anyway. Such schemes tend to be broken by sorting on
9410 symbol index. That leaves dynamic NONE relocs as the only other
9411 case where ld might emit multiple relocs at the same address, and
9412 those are only emitted due to target bugs. */
9415 elf_link_sort_cmp1 (const void *A
, const void *B
)
9417 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9418 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9419 int relativea
, relativeb
;
9421 relativea
= a
->type
== reloc_class_relative
;
9422 relativeb
= b
->type
== reloc_class_relative
;
9424 if (relativea
< relativeb
)
9426 if (relativea
> relativeb
)
9428 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9430 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9432 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9434 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9440 elf_link_sort_cmp2 (const void *A
, const void *B
)
9442 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9443 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9445 if (a
->type
< b
->type
)
9447 if (a
->type
> b
->type
)
9449 if (a
->u
.offset
< b
->u
.offset
)
9451 if (a
->u
.offset
> b
->u
.offset
)
9453 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9455 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9461 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9463 asection
*dynamic_relocs
;
9466 bfd_size_type count
, size
;
9467 size_t i
, ret
, sort_elt
, ext_size
;
9468 bfd_byte
*sort
, *s_non_relative
, *p
;
9469 struct elf_link_sort_rela
*sq
;
9470 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9471 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9472 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9473 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9474 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9475 struct bfd_link_order
*lo
;
9479 /* Find a dynamic reloc section. */
9480 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9481 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9482 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9483 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9485 bool use_rela_initialised
= false;
9487 /* This is just here to stop gcc from complaining.
9488 Its initialization checking code is not perfect. */
9491 /* Both sections are present. Examine the sizes
9492 of the indirect sections to help us choose. */
9493 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9494 if (lo
->type
== bfd_indirect_link_order
)
9496 asection
*o
= lo
->u
.indirect
.section
;
9498 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9500 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9501 /* Section size is divisible by both rel and rela sizes.
9502 It is of no help to us. */
9506 /* Section size is only divisible by rela. */
9507 if (use_rela_initialised
&& !use_rela
)
9509 _bfd_error_handler (_("%pB: unable to sort relocs - "
9510 "they are in more than one size"),
9512 bfd_set_error (bfd_error_invalid_operation
);
9518 use_rela_initialised
= true;
9522 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9524 /* Section size is only divisible by rel. */
9525 if (use_rela_initialised
&& use_rela
)
9527 _bfd_error_handler (_("%pB: unable to sort relocs - "
9528 "they are in more than one size"),
9530 bfd_set_error (bfd_error_invalid_operation
);
9536 use_rela_initialised
= true;
9541 /* The section size is not divisible by either -
9542 something is wrong. */
9543 _bfd_error_handler (_("%pB: unable to sort relocs - "
9544 "they are of an unknown size"), abfd
);
9545 bfd_set_error (bfd_error_invalid_operation
);
9550 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9551 if (lo
->type
== bfd_indirect_link_order
)
9553 asection
*o
= lo
->u
.indirect
.section
;
9555 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9557 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9558 /* Section size is divisible by both rel and rela sizes.
9559 It is of no help to us. */
9563 /* Section size is only divisible by rela. */
9564 if (use_rela_initialised
&& !use_rela
)
9566 _bfd_error_handler (_("%pB: unable to sort relocs - "
9567 "they are in more than one size"),
9569 bfd_set_error (bfd_error_invalid_operation
);
9575 use_rela_initialised
= true;
9579 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9581 /* Section size is only divisible by rel. */
9582 if (use_rela_initialised
&& use_rela
)
9584 _bfd_error_handler (_("%pB: unable to sort relocs - "
9585 "they are in more than one size"),
9587 bfd_set_error (bfd_error_invalid_operation
);
9593 use_rela_initialised
= true;
9598 /* The section size is not divisible by either -
9599 something is wrong. */
9600 _bfd_error_handler (_("%pB: unable to sort relocs - "
9601 "they are of an unknown size"), abfd
);
9602 bfd_set_error (bfd_error_invalid_operation
);
9607 if (! use_rela_initialised
)
9611 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9613 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9620 dynamic_relocs
= rela_dyn
;
9621 ext_size
= bed
->s
->sizeof_rela
;
9622 swap_in
= bed
->s
->swap_reloca_in
;
9623 swap_out
= bed
->s
->swap_reloca_out
;
9627 dynamic_relocs
= rel_dyn
;
9628 ext_size
= bed
->s
->sizeof_rel
;
9629 swap_in
= bed
->s
->swap_reloc_in
;
9630 swap_out
= bed
->s
->swap_reloc_out
;
9634 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9635 if (lo
->type
== bfd_indirect_link_order
)
9636 size
+= lo
->u
.indirect
.section
->size
;
9638 if (size
!= dynamic_relocs
->size
)
9641 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9642 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9644 count
= dynamic_relocs
->size
/ ext_size
;
9647 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9651 (*info
->callbacks
->warning
)
9652 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9656 if (bed
->s
->arch_size
== 32)
9657 r_sym_mask
= ~(bfd_vma
) 0xff;
9659 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9661 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9662 if (lo
->type
== bfd_indirect_link_order
)
9664 bfd_byte
*erel
, *erelend
;
9665 asection
*o
= lo
->u
.indirect
.section
;
9667 if (o
->contents
== NULL
&& o
->size
!= 0)
9669 /* This is a reloc section that is being handled as a normal
9670 section. See bfd_section_from_shdr. We can't combine
9671 relocs in this case. */
9676 erelend
= o
->contents
+ o
->size
;
9677 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9679 while (erel
< erelend
)
9681 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9683 (*swap_in
) (abfd
, erel
, s
->rela
);
9684 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9685 s
->u
.sym_mask
= r_sym_mask
;
9691 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9693 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9695 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9696 if (s
->type
!= reloc_class_relative
)
9702 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9703 for (; i
< count
; i
++, p
+= sort_elt
)
9705 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9706 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9708 sp
->u
.offset
= sq
->rela
->r_offset
;
9711 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9713 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9714 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9716 /* We have plt relocs in .rela.dyn. */
9717 sq
= (struct elf_link_sort_rela
*) sort
;
9718 for (i
= 0; i
< count
; i
++)
9719 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9721 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9723 struct bfd_link_order
**plo
;
9724 /* Put srelplt link_order last. This is so the output_offset
9725 set in the next loop is correct for DT_JMPREL. */
9726 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9727 if ((*plo
)->type
== bfd_indirect_link_order
9728 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9734 plo
= &(*plo
)->next
;
9737 dynamic_relocs
->map_tail
.link_order
= lo
;
9742 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9743 if (lo
->type
== bfd_indirect_link_order
)
9745 bfd_byte
*erel
, *erelend
;
9746 asection
*o
= lo
->u
.indirect
.section
;
9749 erelend
= o
->contents
+ o
->size
;
9750 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9751 while (erel
< erelend
)
9753 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9754 (*swap_out
) (abfd
, s
->rela
, erel
);
9761 *psec
= dynamic_relocs
;
9765 /* Add a symbol to the output symbol string table. */
9768 elf_link_output_symstrtab (void *finf
,
9770 Elf_Internal_Sym
*elfsym
,
9771 asection
*input_sec
,
9772 struct elf_link_hash_entry
*h
)
9774 struct elf_final_link_info
*flinfo
= finf
;
9775 int (*output_symbol_hook
)
9776 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9777 struct elf_link_hash_entry
*);
9778 struct elf_link_hash_table
*hash_table
;
9779 const struct elf_backend_data
*bed
;
9780 bfd_size_type strtabsize
;
9782 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9784 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9785 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9786 if (output_symbol_hook
!= NULL
)
9788 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9793 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9794 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9795 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9796 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9800 || (input_sec
->flags
& SEC_EXCLUDE
))
9801 elfsym
->st_name
= (unsigned long) -1;
9804 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9805 to get the final offset for st_name. */
9806 char *versioned_name
= (char *) name
;
9809 if (h
->versioned
== versioned
&& h
->def_dynamic
)
9811 /* Keep only one '@' for versioned symbols defined in
9813 char *version
= strrchr (name
, ELF_VER_CHR
);
9814 char *base_end
= strchr (name
, ELF_VER_CHR
);
9815 if (version
!= base_end
)
9818 size_t len
= strlen (name
);
9819 versioned_name
= bfd_alloc (flinfo
->output_bfd
, len
);
9820 if (versioned_name
== NULL
)
9822 base_len
= base_end
- name
;
9823 memcpy (versioned_name
, name
, base_len
);
9824 memcpy (versioned_name
+ base_len
, version
,
9829 else if (flinfo
->info
->unique_symbol
9830 && ELF_ST_BIND (elfsym
->st_info
) == STB_LOCAL
)
9832 struct local_hash_entry
*lh
;
9836 switch (ELF_ST_TYPE (elfsym
->st_info
))
9842 lh
= (struct local_hash_entry
*) bfd_hash_lookup
9843 (&flinfo
->local_hash_table
, name
, true, false);
9846 /* Always append ".COUNT" to local symbols to avoid
9847 potential conflicts with local symbol "XXX.COUNT". */
9848 sprintf (buf
, "%lx", lh
->count
);
9849 base_len
= lh
->size
;
9852 base_len
= strlen (name
);
9853 lh
->size
= base_len
;
9855 count_len
= strlen (buf
);
9856 versioned_name
= bfd_alloc (flinfo
->output_bfd
,
9857 base_len
+ count_len
+ 2);
9858 if (versioned_name
== NULL
)
9860 memcpy (versioned_name
, name
, base_len
);
9861 versioned_name
[base_len
] = '.';
9862 memcpy (versioned_name
+ base_len
+ 1, buf
,
9869 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9870 versioned_name
, false);
9871 if (elfsym
->st_name
== (unsigned long) -1)
9875 hash_table
= elf_hash_table (flinfo
->info
);
9876 strtabsize
= hash_table
->strtabsize
;
9877 if (strtabsize
<= hash_table
->strtabcount
)
9879 strtabsize
+= strtabsize
;
9880 hash_table
->strtabsize
= strtabsize
;
9881 strtabsize
*= sizeof (*hash_table
->strtab
);
9883 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9885 if (hash_table
->strtab
== NULL
)
9888 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9889 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9890 = hash_table
->strtabcount
;
9891 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9892 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9894 flinfo
->output_bfd
->symcount
+= 1;
9895 hash_table
->strtabcount
+= 1;
9900 /* Swap symbols out to the symbol table and flush the output symbols to
9904 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9906 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9909 const struct elf_backend_data
*bed
;
9911 Elf_Internal_Shdr
*hdr
;
9915 if (!hash_table
->strtabcount
)
9918 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9920 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9922 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9923 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9927 if (flinfo
->symshndxbuf
)
9929 amt
= sizeof (Elf_External_Sym_Shndx
);
9930 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9931 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9932 if (flinfo
->symshndxbuf
== NULL
)
9939 /* Now swap out the symbols. */
9940 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9942 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9943 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9944 elfsym
->sym
.st_name
= 0;
9947 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9948 elfsym
->sym
.st_name
);
9950 /* Inform the linker of the addition of this symbol. */
9952 if (flinfo
->info
->callbacks
->ctf_new_symbol
)
9953 flinfo
->info
->callbacks
->ctf_new_symbol (elfsym
->dest_index
,
9956 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9957 ((bfd_byte
*) symbuf
9958 + (elfsym
->dest_index
9959 * bed
->s
->sizeof_sym
)),
9960 (flinfo
->symshndxbuf
9961 + elfsym
->destshndx_index
));
9964 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9965 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9966 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9967 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9968 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9970 hdr
->sh_size
+= amt
;
9978 free (hash_table
->strtab
);
9979 hash_table
->strtab
= NULL
;
9984 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9987 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9989 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9990 && sym
->st_shndx
< SHN_LORESERVE
)
9992 /* The gABI doesn't support dynamic symbols in output sections
9995 /* xgettext:c-format */
9996 (_("%pB: too many sections: %d (>= %d)"),
9997 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9998 bfd_set_error (bfd_error_nonrepresentable_section
);
10004 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
10005 allowing an unsatisfied unversioned symbol in the DSO to match a
10006 versioned symbol that would normally require an explicit version.
10007 We also handle the case that a DSO references a hidden symbol
10008 which may be satisfied by a versioned symbol in another DSO. */
10011 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
10012 const struct elf_backend_data
*bed
,
10013 struct elf_link_hash_entry
*h
)
10016 struct elf_link_loaded_list
*loaded
;
10018 if (!is_elf_hash_table (info
->hash
))
10021 /* Check indirect symbol. */
10022 while (h
->root
.type
== bfd_link_hash_indirect
)
10023 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10025 switch (h
->root
.type
)
10031 case bfd_link_hash_undefined
:
10032 case bfd_link_hash_undefweak
:
10033 abfd
= h
->root
.u
.undef
.abfd
;
10035 || (abfd
->flags
& DYNAMIC
) == 0
10036 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
10040 case bfd_link_hash_defined
:
10041 case bfd_link_hash_defweak
:
10042 abfd
= h
->root
.u
.def
.section
->owner
;
10045 case bfd_link_hash_common
:
10046 abfd
= h
->root
.u
.c
.p
->section
->owner
;
10049 BFD_ASSERT (abfd
!= NULL
);
10051 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
10053 loaded
= loaded
->next
)
10056 Elf_Internal_Shdr
*hdr
;
10058 size_t extsymcount
;
10060 Elf_Internal_Shdr
*versymhdr
;
10061 Elf_Internal_Sym
*isym
;
10062 Elf_Internal_Sym
*isymend
;
10063 Elf_Internal_Sym
*isymbuf
;
10064 Elf_External_Versym
*ever
;
10065 Elf_External_Versym
*extversym
;
10067 input
= loaded
->abfd
;
10069 /* We check each DSO for a possible hidden versioned definition. */
10071 || elf_dynversym (input
) == 0)
10074 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
10076 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10077 if (elf_bad_symtab (input
))
10079 extsymcount
= symcount
;
10084 extsymcount
= symcount
- hdr
->sh_info
;
10085 extsymoff
= hdr
->sh_info
;
10088 if (extsymcount
== 0)
10091 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
10093 if (isymbuf
== NULL
)
10096 /* Read in any version definitions. */
10097 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
10098 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
10099 || (extversym
= (Elf_External_Versym
*)
10100 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
10101 versymhdr
->sh_size
)) == NULL
)
10107 ever
= extversym
+ extsymoff
;
10108 isymend
= isymbuf
+ extsymcount
;
10109 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
10112 Elf_Internal_Versym iver
;
10113 unsigned short version_index
;
10115 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
10116 || isym
->st_shndx
== SHN_UNDEF
)
10119 name
= bfd_elf_string_from_elf_section (input
,
10122 if (strcmp (name
, h
->root
.root
.string
) != 0)
10125 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
10127 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
10128 && !(h
->def_regular
10129 && h
->forced_local
))
10131 /* If we have a non-hidden versioned sym, then it should
10132 have provided a definition for the undefined sym unless
10133 it is defined in a non-shared object and forced local.
10138 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
10139 if (version_index
== 1 || version_index
== 2)
10141 /* This is the base or first version. We can use it. */
10155 /* Convert ELF common symbol TYPE. */
10158 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
10160 /* Commom symbol can only appear in relocatable link. */
10161 if (!bfd_link_relocatable (info
))
10163 switch (info
->elf_stt_common
)
10167 case elf_stt_common
:
10170 case no_elf_stt_common
:
10177 /* Add an external symbol to the symbol table. This is called from
10178 the hash table traversal routine. When generating a shared object,
10179 we go through the symbol table twice. The first time we output
10180 anything that might have been forced to local scope in a version
10181 script. The second time we output the symbols that are still
10185 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
10187 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
10188 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
10189 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
10191 Elf_Internal_Sym sym
;
10192 asection
*input_sec
;
10193 const struct elf_backend_data
*bed
;
10198 if (h
->root
.type
== bfd_link_hash_warning
)
10200 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10201 if (h
->root
.type
== bfd_link_hash_new
)
10205 /* Decide whether to output this symbol in this pass. */
10206 if (eoinfo
->localsyms
)
10208 if (!h
->forced_local
)
10213 if (h
->forced_local
)
10217 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10219 if (h
->root
.type
== bfd_link_hash_undefined
)
10221 /* If we have an undefined symbol reference here then it must have
10222 come from a shared library that is being linked in. (Undefined
10223 references in regular files have already been handled unless
10224 they are in unreferenced sections which are removed by garbage
10226 bool ignore_undef
= false;
10228 /* Some symbols may be special in that the fact that they're
10229 undefined can be safely ignored - let backend determine that. */
10230 if (bed
->elf_backend_ignore_undef_symbol
)
10231 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
10233 /* If we are reporting errors for this situation then do so now. */
10235 && h
->ref_dynamic_nonweak
10236 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
10237 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10238 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10240 flinfo
->info
->callbacks
->undefined_symbol
10241 (flinfo
->info
, h
->root
.root
.string
,
10242 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10243 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10244 && !flinfo
->info
->warn_unresolved_syms
);
10247 /* Strip a global symbol defined in a discarded section. */
10252 /* We should also warn if a forced local symbol is referenced from
10253 shared libraries. */
10254 if (bfd_link_executable (flinfo
->info
)
10259 && h
->ref_dynamic_nonweak
10260 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10264 struct elf_link_hash_entry
*hi
= h
;
10266 /* Check indirect symbol. */
10267 while (hi
->root
.type
== bfd_link_hash_indirect
)
10268 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10270 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10271 /* xgettext:c-format */
10272 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10273 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10274 /* xgettext:c-format */
10275 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10277 /* xgettext:c-format */
10278 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10279 def_bfd
= flinfo
->output_bfd
;
10280 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10281 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10282 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10283 h
->root
.root
.string
, def_bfd
);
10284 bfd_set_error (bfd_error_bad_value
);
10285 eoinfo
->failed
= true;
10289 /* We don't want to output symbols that have never been mentioned by
10290 a regular file, or that we have been told to strip. However, if
10291 h->indx is set to -2, the symbol is used by a reloc and we must
10296 else if ((h
->def_dynamic
10298 || h
->root
.type
== bfd_link_hash_new
)
10300 && !h
->ref_regular
)
10302 else if (flinfo
->info
->strip
== strip_all
)
10304 else if (flinfo
->info
->strip
== strip_some
10305 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10306 h
->root
.root
.string
, false, false) == NULL
)
10308 else if ((h
->root
.type
== bfd_link_hash_defined
10309 || h
->root
.type
== bfd_link_hash_defweak
)
10310 && ((flinfo
->info
->strip_discarded
10311 && discarded_section (h
->root
.u
.def
.section
))
10312 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10313 && h
->root
.u
.def
.section
->owner
!= NULL
10314 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10316 else if ((h
->root
.type
== bfd_link_hash_undefined
10317 || h
->root
.type
== bfd_link_hash_undefweak
)
10318 && h
->root
.u
.undef
.abfd
!= NULL
10319 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10324 /* If we're stripping it, and it's not a dynamic symbol, there's
10325 nothing else to do. However, if it is a forced local symbol or
10326 an ifunc symbol we need to give the backend finish_dynamic_symbol
10327 function a chance to make it dynamic. */
10329 && h
->dynindx
== -1
10330 && type
!= STT_GNU_IFUNC
10331 && !h
->forced_local
)
10335 sym
.st_size
= h
->size
;
10336 sym
.st_other
= h
->other
;
10337 switch (h
->root
.type
)
10340 case bfd_link_hash_new
:
10341 case bfd_link_hash_warning
:
10345 case bfd_link_hash_undefined
:
10346 case bfd_link_hash_undefweak
:
10347 input_sec
= bfd_und_section_ptr
;
10348 sym
.st_shndx
= SHN_UNDEF
;
10351 case bfd_link_hash_defined
:
10352 case bfd_link_hash_defweak
:
10354 input_sec
= h
->root
.u
.def
.section
;
10355 if (input_sec
->output_section
!= NULL
)
10358 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10359 input_sec
->output_section
);
10360 if (sym
.st_shndx
== SHN_BAD
)
10363 /* xgettext:c-format */
10364 (_("%pB: could not find output section %pA for input section %pA"),
10365 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10366 bfd_set_error (bfd_error_nonrepresentable_section
);
10367 eoinfo
->failed
= true;
10371 /* ELF symbols in relocatable files are section relative,
10372 but in nonrelocatable files they are virtual
10374 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10375 if (!bfd_link_relocatable (flinfo
->info
))
10377 sym
.st_value
+= input_sec
->output_section
->vma
;
10378 if (h
->type
== STT_TLS
)
10380 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10381 if (tls_sec
!= NULL
)
10382 sym
.st_value
-= tls_sec
->vma
;
10388 BFD_ASSERT (input_sec
->owner
== NULL
10389 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10390 sym
.st_shndx
= SHN_UNDEF
;
10391 input_sec
= bfd_und_section_ptr
;
10396 case bfd_link_hash_common
:
10397 input_sec
= h
->root
.u
.c
.p
->section
;
10398 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10399 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10402 case bfd_link_hash_indirect
:
10403 /* These symbols are created by symbol versioning. They point
10404 to the decorated version of the name. For example, if the
10405 symbol foo@@GNU_1.2 is the default, which should be used when
10406 foo is used with no version, then we add an indirect symbol
10407 foo which points to foo@@GNU_1.2. We ignore these symbols,
10408 since the indirected symbol is already in the hash table. */
10412 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10413 switch (h
->root
.type
)
10415 case bfd_link_hash_common
:
10416 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10418 case bfd_link_hash_defined
:
10419 case bfd_link_hash_defweak
:
10420 if (bed
->common_definition (&sym
))
10421 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10425 case bfd_link_hash_undefined
:
10426 case bfd_link_hash_undefweak
:
10432 if (h
->forced_local
)
10434 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10435 /* Turn off visibility on local symbol. */
10436 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10438 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10439 else if (h
->unique_global
&& h
->def_regular
)
10440 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10441 else if (h
->root
.type
== bfd_link_hash_undefweak
10442 || h
->root
.type
== bfd_link_hash_defweak
)
10443 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10445 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10446 sym
.st_target_internal
= h
->target_internal
;
10448 /* Give the processor backend a chance to tweak the symbol value,
10449 and also to finish up anything that needs to be done for this
10450 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10451 forced local syms when non-shared is due to a historical quirk.
10452 STT_GNU_IFUNC symbol must go through PLT. */
10453 if ((h
->type
== STT_GNU_IFUNC
10455 && !bfd_link_relocatable (flinfo
->info
))
10456 || ((h
->dynindx
!= -1
10457 || h
->forced_local
)
10458 && ((bfd_link_pic (flinfo
->info
)
10459 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10460 || h
->root
.type
!= bfd_link_hash_undefweak
))
10461 || !h
->forced_local
)
10462 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10464 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10465 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10467 eoinfo
->failed
= true;
10472 /* If we are marking the symbol as undefined, and there are no
10473 non-weak references to this symbol from a regular object, then
10474 mark the symbol as weak undefined; if there are non-weak
10475 references, mark the symbol as strong. We can't do this earlier,
10476 because it might not be marked as undefined until the
10477 finish_dynamic_symbol routine gets through with it. */
10478 if (sym
.st_shndx
== SHN_UNDEF
10480 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10481 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10484 type
= ELF_ST_TYPE (sym
.st_info
);
10486 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10487 if (type
== STT_GNU_IFUNC
)
10490 if (h
->ref_regular_nonweak
)
10491 bindtype
= STB_GLOBAL
;
10493 bindtype
= STB_WEAK
;
10494 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10497 /* If this is a symbol defined in a dynamic library, don't use the
10498 symbol size from the dynamic library. Relinking an executable
10499 against a new library may introduce gratuitous changes in the
10500 executable's symbols if we keep the size. */
10501 if (sym
.st_shndx
== SHN_UNDEF
10506 /* If a non-weak symbol with non-default visibility is not defined
10507 locally, it is a fatal error. */
10508 if (!bfd_link_relocatable (flinfo
->info
)
10509 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10510 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10511 && h
->root
.type
== bfd_link_hash_undefined
10512 && !h
->def_regular
)
10516 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10517 /* xgettext:c-format */
10518 msg
= _("%pB: protected symbol `%s' isn't defined");
10519 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10520 /* xgettext:c-format */
10521 msg
= _("%pB: internal symbol `%s' isn't defined");
10523 /* xgettext:c-format */
10524 msg
= _("%pB: hidden symbol `%s' isn't defined");
10525 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10526 bfd_set_error (bfd_error_bad_value
);
10527 eoinfo
->failed
= true;
10531 /* If this symbol should be put in the .dynsym section, then put it
10532 there now. We already know the symbol index. We also fill in
10533 the entry in the .hash section. */
10534 if (h
->dynindx
!= -1
10535 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10536 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10537 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10541 /* Since there is no version information in the dynamic string,
10542 if there is no version info in symbol version section, we will
10543 have a run-time problem if not linking executable, referenced
10544 by shared library, or not bound locally. */
10545 if (h
->verinfo
.verdef
== NULL
10546 && (!bfd_link_executable (flinfo
->info
)
10548 || !h
->def_regular
))
10550 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10552 if (p
&& p
[1] != '\0')
10555 /* xgettext:c-format */
10556 (_("%pB: no symbol version section for versioned symbol `%s'"),
10557 flinfo
->output_bfd
, h
->root
.root
.string
);
10558 eoinfo
->failed
= true;
10563 sym
.st_name
= h
->dynstr_index
;
10564 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10565 + h
->dynindx
* bed
->s
->sizeof_sym
);
10566 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10568 eoinfo
->failed
= true;
10572 /* Inform the linker of the addition of this symbol. */
10574 if (flinfo
->info
->callbacks
->ctf_new_dynsym
)
10575 flinfo
->info
->callbacks
->ctf_new_dynsym (h
->dynindx
, &sym
);
10577 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10579 if (flinfo
->hash_sec
!= NULL
)
10581 size_t hash_entry_size
;
10582 bfd_byte
*bucketpos
;
10584 size_t bucketcount
;
10587 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10588 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10591 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10592 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10593 + (bucket
+ 2) * hash_entry_size
);
10594 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10595 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10597 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10598 ((bfd_byte
*) flinfo
->hash_sec
->contents
10599 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10602 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10604 Elf_Internal_Versym iversym
;
10605 Elf_External_Versym
*eversym
;
10607 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10609 if (h
->verinfo
.verdef
== NULL
10610 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10611 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10612 iversym
.vs_vers
= 1;
10614 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10618 if (h
->verinfo
.vertree
== NULL
)
10619 iversym
.vs_vers
= 1;
10621 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10622 if (flinfo
->info
->create_default_symver
)
10626 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10627 defined locally. */
10628 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10629 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10631 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10632 eversym
+= h
->dynindx
;
10633 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10637 /* If the symbol is undefined, and we didn't output it to .dynsym,
10638 strip it from .symtab too. Obviously we can't do this for
10639 relocatable output or when needed for --emit-relocs. */
10640 else if (input_sec
== bfd_und_section_ptr
10642 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10643 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10644 && !bfd_link_relocatable (flinfo
->info
))
10647 /* Also strip others that we couldn't earlier due to dynamic symbol
10651 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10654 /* Output a FILE symbol so that following locals are not associated
10655 with the wrong input file. We need one for forced local symbols
10656 if we've seen more than one FILE symbol or when we have exactly
10657 one FILE symbol but global symbols are present in a file other
10658 than the one with the FILE symbol. We also need one if linker
10659 defined symbols are present. In practice these conditions are
10660 always met, so just emit the FILE symbol unconditionally. */
10661 if (eoinfo
->localsyms
10662 && !eoinfo
->file_sym_done
10663 && eoinfo
->flinfo
->filesym_count
!= 0)
10665 Elf_Internal_Sym fsym
;
10667 memset (&fsym
, 0, sizeof (fsym
));
10668 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10669 fsym
.st_shndx
= SHN_ABS
;
10670 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10671 bfd_und_section_ptr
, NULL
))
10674 eoinfo
->file_sym_done
= true;
10677 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10678 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10682 eoinfo
->failed
= true;
10687 else if (h
->indx
== -2)
10693 /* Return TRUE if special handling is done for relocs in SEC against
10694 symbols defined in discarded sections. */
10697 elf_section_ignore_discarded_relocs (asection
*sec
)
10699 const struct elf_backend_data
*bed
;
10701 switch (sec
->sec_info_type
)
10703 case SEC_INFO_TYPE_STABS
:
10704 case SEC_INFO_TYPE_EH_FRAME
:
10705 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10711 bed
= get_elf_backend_data (sec
->owner
);
10712 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10713 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10719 /* Return a mask saying how ld should treat relocations in SEC against
10720 symbols defined in discarded sections. If this function returns
10721 COMPLAIN set, ld will issue a warning message. If this function
10722 returns PRETEND set, and the discarded section was link-once and the
10723 same size as the kept link-once section, ld will pretend that the
10724 symbol was actually defined in the kept section. Otherwise ld will
10725 zero the reloc (at least that is the intent, but some cooperation by
10726 the target dependent code is needed, particularly for REL targets). */
10729 _bfd_elf_default_action_discarded (asection
*sec
)
10731 if (sec
->flags
& SEC_DEBUGGING
)
10734 if (strcmp (".eh_frame", sec
->name
) == 0)
10737 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10740 return COMPLAIN
| PRETEND
;
10743 /* Find a match between a section and a member of a section group. */
10746 match_group_member (asection
*sec
, asection
*group
,
10747 struct bfd_link_info
*info
)
10749 asection
*first
= elf_next_in_group (group
);
10750 asection
*s
= first
;
10754 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10757 s
= elf_next_in_group (s
);
10765 /* Check if the kept section of a discarded section SEC can be used
10766 to replace it. Return the replacement if it is OK. Otherwise return
10770 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10774 kept
= sec
->kept_section
;
10777 if ((kept
->flags
& SEC_GROUP
) != 0)
10778 kept
= match_group_member (sec
, kept
, info
);
10781 if ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10782 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
))
10786 /* Get the real kept section. */
10788 for (next
= kept
->kept_section
;
10790 next
= next
->kept_section
)
10794 sec
->kept_section
= kept
;
10799 /* Link an input file into the linker output file. This function
10800 handles all the sections and relocations of the input file at once.
10801 This is so that we only have to read the local symbols once, and
10802 don't have to keep them in memory. */
10805 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10807 int (*relocate_section
)
10808 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10809 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10811 Elf_Internal_Shdr
*symtab_hdr
;
10812 size_t locsymcount
;
10814 Elf_Internal_Sym
*isymbuf
;
10815 Elf_Internal_Sym
*isym
;
10816 Elf_Internal_Sym
*isymend
;
10818 asection
**ppsection
;
10820 const struct elf_backend_data
*bed
;
10821 struct elf_link_hash_entry
**sym_hashes
;
10822 bfd_size_type address_size
;
10823 bfd_vma r_type_mask
;
10825 bool have_file_sym
= false;
10827 output_bfd
= flinfo
->output_bfd
;
10828 bed
= get_elf_backend_data (output_bfd
);
10829 relocate_section
= bed
->elf_backend_relocate_section
;
10831 /* If this is a dynamic object, we don't want to do anything here:
10832 we don't want the local symbols, and we don't want the section
10834 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10837 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10838 if (elf_bad_symtab (input_bfd
))
10840 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10845 locsymcount
= symtab_hdr
->sh_info
;
10846 extsymoff
= symtab_hdr
->sh_info
;
10849 /* Enable GNU OSABI features in the output BFD that are used in the input
10851 if (bed
->elf_osabi
== ELFOSABI_NONE
10852 || bed
->elf_osabi
== ELFOSABI_GNU
10853 || bed
->elf_osabi
== ELFOSABI_FREEBSD
)
10854 elf_tdata (output_bfd
)->has_gnu_osabi
10855 |= (elf_tdata (input_bfd
)->has_gnu_osabi
10856 & (bfd_link_relocatable (flinfo
->info
)
10857 ? -1 : ~elf_gnu_osabi_retain
));
10859 /* Read the local symbols. */
10860 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10861 if (isymbuf
== NULL
&& locsymcount
!= 0)
10863 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10864 flinfo
->internal_syms
,
10865 flinfo
->external_syms
,
10866 flinfo
->locsym_shndx
);
10867 if (isymbuf
== NULL
)
10871 /* Find local symbol sections and adjust values of symbols in
10872 SEC_MERGE sections. Write out those local symbols we know are
10873 going into the output file. */
10874 isymend
= isymbuf
+ locsymcount
;
10875 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10877 isym
++, pindex
++, ppsection
++)
10881 Elf_Internal_Sym osym
;
10887 if (elf_bad_symtab (input_bfd
))
10889 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10896 if (isym
->st_shndx
== SHN_UNDEF
)
10897 isec
= bfd_und_section_ptr
;
10898 else if (isym
->st_shndx
== SHN_ABS
)
10899 isec
= bfd_abs_section_ptr
;
10900 else if (isym
->st_shndx
== SHN_COMMON
)
10901 isec
= bfd_com_section_ptr
;
10904 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10907 /* Don't attempt to output symbols with st_shnx in the
10908 reserved range other than SHN_ABS and SHN_COMMON. */
10909 isec
= bfd_und_section_ptr
;
10911 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10912 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10914 _bfd_merged_section_offset (output_bfd
, &isec
,
10915 elf_section_data (isec
)->sec_info
,
10921 /* Don't output the first, undefined, symbol. In fact, don't
10922 output any undefined local symbol. */
10923 if (isec
== bfd_und_section_ptr
)
10926 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10928 /* We never output section symbols. Instead, we use the
10929 section symbol of the corresponding section in the output
10934 /* If we are stripping all symbols, we don't want to output this
10936 if (flinfo
->info
->strip
== strip_all
)
10939 /* If we are discarding all local symbols, we don't want to
10940 output this one. If we are generating a relocatable output
10941 file, then some of the local symbols may be required by
10942 relocs; we output them below as we discover that they are
10944 if (flinfo
->info
->discard
== discard_all
)
10947 /* If this symbol is defined in a section which we are
10948 discarding, we don't need to keep it. */
10949 if (isym
->st_shndx
!= SHN_UNDEF
10950 && isym
->st_shndx
< SHN_LORESERVE
10951 && isec
->output_section
== NULL
10952 && flinfo
->info
->non_contiguous_regions
10953 && flinfo
->info
->non_contiguous_regions_warnings
)
10955 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10956 "discards section `%s' from '%s'\n"),
10957 isec
->name
, bfd_get_filename (isec
->owner
));
10961 if (isym
->st_shndx
!= SHN_UNDEF
10962 && isym
->st_shndx
< SHN_LORESERVE
10963 && bfd_section_removed_from_list (output_bfd
,
10964 isec
->output_section
))
10967 /* Get the name of the symbol. */
10968 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10973 /* See if we are discarding symbols with this name. */
10974 if ((flinfo
->info
->strip
== strip_some
10975 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, false, false)
10977 || (((flinfo
->info
->discard
== discard_sec_merge
10978 && (isec
->flags
& SEC_MERGE
)
10979 && !bfd_link_relocatable (flinfo
->info
))
10980 || flinfo
->info
->discard
== discard_l
)
10981 && bfd_is_local_label_name (input_bfd
, name
)))
10984 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10986 if (input_bfd
->lto_output
)
10987 /* -flto puts a temp file name here. This means builds
10988 are not reproducible. Discard the symbol. */
10990 have_file_sym
= true;
10991 flinfo
->filesym_count
+= 1;
10993 if (!have_file_sym
)
10995 /* In the absence of debug info, bfd_find_nearest_line uses
10996 FILE symbols to determine the source file for local
10997 function symbols. Provide a FILE symbol here if input
10998 files lack such, so that their symbols won't be
10999 associated with a previous input file. It's not the
11000 source file, but the best we can do. */
11001 const char *filename
;
11002 have_file_sym
= true;
11003 flinfo
->filesym_count
+= 1;
11004 memset (&osym
, 0, sizeof (osym
));
11005 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
11006 osym
.st_shndx
= SHN_ABS
;
11007 if (input_bfd
->lto_output
)
11010 filename
= lbasename (bfd_get_filename (input_bfd
));
11011 if (!elf_link_output_symstrtab (flinfo
, filename
, &osym
,
11012 bfd_abs_section_ptr
, NULL
))
11018 /* Adjust the section index for the output file. */
11019 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11020 isec
->output_section
);
11021 if (osym
.st_shndx
== SHN_BAD
)
11024 /* ELF symbols in relocatable files are section relative, but
11025 in executable files they are virtual addresses. Note that
11026 this code assumes that all ELF sections have an associated
11027 BFD section with a reasonable value for output_offset; below
11028 we assume that they also have a reasonable value for
11029 output_section. Any special sections must be set up to meet
11030 these requirements. */
11031 osym
.st_value
+= isec
->output_offset
;
11032 if (!bfd_link_relocatable (flinfo
->info
))
11034 osym
.st_value
+= isec
->output_section
->vma
;
11035 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
11037 /* STT_TLS symbols are relative to PT_TLS segment base. */
11038 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
11039 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
11041 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
11046 indx
= bfd_get_symcount (output_bfd
);
11047 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
11054 if (bed
->s
->arch_size
== 32)
11056 r_type_mask
= 0xff;
11062 r_type_mask
= 0xffffffff;
11067 /* Relocate the contents of each section. */
11068 sym_hashes
= elf_sym_hashes (input_bfd
);
11069 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
11071 bfd_byte
*contents
;
11073 if (! o
->linker_mark
)
11075 /* This section was omitted from the link. */
11079 if (!flinfo
->info
->resolve_section_groups
11080 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
11082 /* Deal with the group signature symbol. */
11083 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
11084 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
11085 asection
*osec
= o
->output_section
;
11087 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
11088 if (symndx
>= locsymcount
11089 || (elf_bad_symtab (input_bfd
)
11090 && flinfo
->sections
[symndx
] == NULL
))
11092 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
11093 while (h
->root
.type
== bfd_link_hash_indirect
11094 || h
->root
.type
== bfd_link_hash_warning
)
11095 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11096 /* Arrange for symbol to be output. */
11098 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
11100 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
11102 /* We'll use the output section target_index. */
11103 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11104 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
11108 if (flinfo
->indices
[symndx
] == -1)
11110 /* Otherwise output the local symbol now. */
11111 Elf_Internal_Sym sym
= isymbuf
[symndx
];
11112 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11117 name
= bfd_elf_string_from_elf_section (input_bfd
,
11118 symtab_hdr
->sh_link
,
11123 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11125 if (sym
.st_shndx
== SHN_BAD
)
11128 sym
.st_value
+= o
->output_offset
;
11130 indx
= bfd_get_symcount (output_bfd
);
11131 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
11136 flinfo
->indices
[symndx
] = indx
;
11140 elf_section_data (osec
)->this_hdr
.sh_info
11141 = flinfo
->indices
[symndx
];
11145 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11146 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
11149 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
11151 /* Section was created by _bfd_elf_link_create_dynamic_sections
11156 /* Get the contents of the section. They have been cached by a
11157 relaxation routine. Note that o is a section in an input
11158 file, so the contents field will not have been set by any of
11159 the routines which work on output files. */
11160 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
11162 contents
= elf_section_data (o
)->this_hdr
.contents
;
11163 if (bed
->caches_rawsize
11165 && o
->rawsize
< o
->size
)
11167 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
11168 contents
= flinfo
->contents
;
11173 contents
= flinfo
->contents
;
11174 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
11178 if ((o
->flags
& SEC_RELOC
) != 0)
11180 Elf_Internal_Rela
*internal_relocs
;
11181 Elf_Internal_Rela
*rel
, *relend
;
11182 int action_discarded
;
11185 /* Get the swapped relocs. */
11187 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
11188 flinfo
->internal_relocs
, false);
11189 if (internal_relocs
== NULL
11190 && o
->reloc_count
> 0)
11193 /* We need to reverse-copy input .ctors/.dtors sections if
11194 they are placed in .init_array/.finit_array for output. */
11195 if (o
->size
> address_size
11196 && ((startswith (o
->name
, ".ctors")
11197 && strcmp (o
->output_section
->name
,
11198 ".init_array") == 0)
11199 || (startswith (o
->name
, ".dtors")
11200 && strcmp (o
->output_section
->name
,
11201 ".fini_array") == 0))
11202 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
11204 if (o
->size
* bed
->s
->int_rels_per_ext_rel
11205 != o
->reloc_count
* address_size
)
11208 /* xgettext:c-format */
11209 (_("error: %pB: size of section %pA is not "
11210 "multiple of address size"),
11212 bfd_set_error (bfd_error_bad_value
);
11215 o
->flags
|= SEC_ELF_REVERSE_COPY
;
11218 action_discarded
= -1;
11219 if (!elf_section_ignore_discarded_relocs (o
))
11220 action_discarded
= (*bed
->action_discarded
) (o
);
11222 /* Run through the relocs evaluating complex reloc symbols and
11223 looking for relocs against symbols from discarded sections
11224 or section symbols from removed link-once sections.
11225 Complain about relocs against discarded sections. Zero
11226 relocs against removed link-once sections. */
11228 rel
= internal_relocs
;
11229 relend
= rel
+ o
->reloc_count
;
11230 for ( ; rel
< relend
; rel
++)
11232 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
11233 unsigned int s_type
;
11234 asection
**ps
, *sec
;
11235 struct elf_link_hash_entry
*h
= NULL
;
11236 const char *sym_name
;
11238 if (r_symndx
== STN_UNDEF
)
11241 if (r_symndx
>= locsymcount
11242 || (elf_bad_symtab (input_bfd
)
11243 && flinfo
->sections
[r_symndx
] == NULL
))
11245 h
= sym_hashes
[r_symndx
- extsymoff
];
11247 /* Badly formatted input files can contain relocs that
11248 reference non-existant symbols. Check here so that
11249 we do not seg fault. */
11253 /* xgettext:c-format */
11254 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
11255 "that references a non-existent global symbol"),
11256 input_bfd
, (uint64_t) rel
->r_info
, o
);
11257 bfd_set_error (bfd_error_bad_value
);
11261 while (h
->root
.type
== bfd_link_hash_indirect
11262 || h
->root
.type
== bfd_link_hash_warning
)
11263 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11267 /* If a plugin symbol is referenced from a non-IR file,
11268 mark the symbol as undefined. Note that the
11269 linker may attach linker created dynamic sections
11270 to the plugin bfd. Symbols defined in linker
11271 created sections are not plugin symbols. */
11272 if ((h
->root
.non_ir_ref_regular
11273 || h
->root
.non_ir_ref_dynamic
)
11274 && (h
->root
.type
== bfd_link_hash_defined
11275 || h
->root
.type
== bfd_link_hash_defweak
)
11276 && (h
->root
.u
.def
.section
->flags
11277 & SEC_LINKER_CREATED
) == 0
11278 && h
->root
.u
.def
.section
->owner
!= NULL
11279 && (h
->root
.u
.def
.section
->owner
->flags
11280 & BFD_PLUGIN
) != 0)
11282 h
->root
.type
= bfd_link_hash_undefined
;
11283 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11287 if (h
->root
.type
== bfd_link_hash_defined
11288 || h
->root
.type
== bfd_link_hash_defweak
)
11289 ps
= &h
->root
.u
.def
.section
;
11291 sym_name
= h
->root
.root
.string
;
11295 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11297 s_type
= ELF_ST_TYPE (sym
->st_info
);
11298 ps
= &flinfo
->sections
[r_symndx
];
11299 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11303 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11304 && !bfd_link_relocatable (flinfo
->info
))
11307 bfd_vma dot
= (rel
->r_offset
11308 + o
->output_offset
+ o
->output_section
->vma
);
11310 printf ("Encountered a complex symbol!");
11311 printf (" (input_bfd %s, section %s, reloc %ld\n",
11312 bfd_get_filename (input_bfd
), o
->name
,
11313 (long) (rel
- internal_relocs
));
11314 printf (" symbol: idx %8.8lx, name %s\n",
11315 r_symndx
, sym_name
);
11316 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11317 (unsigned long) rel
->r_info
,
11318 (unsigned long) rel
->r_offset
);
11320 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11321 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11324 /* Symbol evaluated OK. Update to absolute value. */
11325 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11330 if (action_discarded
!= -1 && ps
!= NULL
)
11332 /* Complain if the definition comes from a
11333 discarded section. */
11334 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11336 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11337 if (action_discarded
& COMPLAIN
)
11338 (*flinfo
->info
->callbacks
->einfo
)
11339 /* xgettext:c-format */
11340 (_("%X`%s' referenced in section `%pA' of %pB: "
11341 "defined in discarded section `%pA' of %pB\n"),
11342 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11344 /* Try to do the best we can to support buggy old
11345 versions of gcc. Pretend that the symbol is
11346 really defined in the kept linkonce section.
11347 FIXME: This is quite broken. Modifying the
11348 symbol here means we will be changing all later
11349 uses of the symbol, not just in this section. */
11350 if (action_discarded
& PRETEND
)
11354 kept
= _bfd_elf_check_kept_section (sec
,
11366 /* Relocate the section by invoking a back end routine.
11368 The back end routine is responsible for adjusting the
11369 section contents as necessary, and (if using Rela relocs
11370 and generating a relocatable output file) adjusting the
11371 reloc addend as necessary.
11373 The back end routine does not have to worry about setting
11374 the reloc address or the reloc symbol index.
11376 The back end routine is given a pointer to the swapped in
11377 internal symbols, and can access the hash table entries
11378 for the external symbols via elf_sym_hashes (input_bfd).
11380 When generating relocatable output, the back end routine
11381 must handle STB_LOCAL/STT_SECTION symbols specially. The
11382 output symbol is going to be a section symbol
11383 corresponding to the output section, which will require
11384 the addend to be adjusted. */
11386 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11387 input_bfd
, o
, contents
,
11395 || bfd_link_relocatable (flinfo
->info
)
11396 || flinfo
->info
->emitrelocations
)
11398 Elf_Internal_Rela
*irela
;
11399 Elf_Internal_Rela
*irelaend
, *irelamid
;
11400 bfd_vma last_offset
;
11401 struct elf_link_hash_entry
**rel_hash
;
11402 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11403 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11404 unsigned int next_erel
;
11406 struct bfd_elf_section_data
*esdi
, *esdo
;
11408 esdi
= elf_section_data (o
);
11409 esdo
= elf_section_data (o
->output_section
);
11410 rela_normal
= false;
11412 /* Adjust the reloc addresses and symbol indices. */
11414 irela
= internal_relocs
;
11415 irelaend
= irela
+ o
->reloc_count
;
11416 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11417 /* We start processing the REL relocs, if any. When we reach
11418 IRELAMID in the loop, we switch to the RELA relocs. */
11420 if (esdi
->rel
.hdr
!= NULL
)
11421 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11422 * bed
->s
->int_rels_per_ext_rel
);
11423 rel_hash_list
= rel_hash
;
11424 rela_hash_list
= NULL
;
11425 last_offset
= o
->output_offset
;
11426 if (!bfd_link_relocatable (flinfo
->info
))
11427 last_offset
+= o
->output_section
->vma
;
11428 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11430 unsigned long r_symndx
;
11432 Elf_Internal_Sym sym
;
11434 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11440 if (irela
== irelamid
)
11442 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11443 rela_hash_list
= rel_hash
;
11444 rela_normal
= bed
->rela_normal
;
11447 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11450 if (irela
->r_offset
>= (bfd_vma
) -2)
11452 /* This is a reloc for a deleted entry or somesuch.
11453 Turn it into an R_*_NONE reloc, at the same
11454 offset as the last reloc. elf_eh_frame.c and
11455 bfd_elf_discard_info rely on reloc offsets
11457 irela
->r_offset
= last_offset
;
11459 irela
->r_addend
= 0;
11463 irela
->r_offset
+= o
->output_offset
;
11465 /* Relocs in an executable have to be virtual addresses. */
11466 if (!bfd_link_relocatable (flinfo
->info
))
11467 irela
->r_offset
+= o
->output_section
->vma
;
11469 last_offset
= irela
->r_offset
;
11471 r_symndx
= irela
->r_info
>> r_sym_shift
;
11472 if (r_symndx
== STN_UNDEF
)
11475 if (r_symndx
>= locsymcount
11476 || (elf_bad_symtab (input_bfd
)
11477 && flinfo
->sections
[r_symndx
] == NULL
))
11479 struct elf_link_hash_entry
*rh
;
11480 unsigned long indx
;
11482 /* This is a reloc against a global symbol. We
11483 have not yet output all the local symbols, so
11484 we do not know the symbol index of any global
11485 symbol. We set the rel_hash entry for this
11486 reloc to point to the global hash table entry
11487 for this symbol. The symbol index is then
11488 set at the end of bfd_elf_final_link. */
11489 indx
= r_symndx
- extsymoff
;
11490 rh
= elf_sym_hashes (input_bfd
)[indx
];
11491 while (rh
->root
.type
== bfd_link_hash_indirect
11492 || rh
->root
.type
== bfd_link_hash_warning
)
11493 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11495 /* Setting the index to -2 tells
11496 elf_link_output_extsym that this symbol is
11497 used by a reloc. */
11498 BFD_ASSERT (rh
->indx
< 0);
11505 /* This is a reloc against a local symbol. */
11508 sym
= isymbuf
[r_symndx
];
11509 sec
= flinfo
->sections
[r_symndx
];
11510 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11512 /* I suppose the backend ought to fill in the
11513 section of any STT_SECTION symbol against a
11514 processor specific section. */
11515 r_symndx
= STN_UNDEF
;
11516 if (bfd_is_abs_section (sec
))
11518 else if (sec
== NULL
|| sec
->owner
== NULL
)
11520 bfd_set_error (bfd_error_bad_value
);
11525 asection
*osec
= sec
->output_section
;
11527 /* If we have discarded a section, the output
11528 section will be the absolute section. In
11529 case of discarded SEC_MERGE sections, use
11530 the kept section. relocate_section should
11531 have already handled discarded linkonce
11533 if (bfd_is_abs_section (osec
)
11534 && sec
->kept_section
!= NULL
11535 && sec
->kept_section
->output_section
!= NULL
)
11537 osec
= sec
->kept_section
->output_section
;
11538 irela
->r_addend
-= osec
->vma
;
11541 if (!bfd_is_abs_section (osec
))
11543 r_symndx
= osec
->target_index
;
11544 if (r_symndx
== STN_UNDEF
)
11546 irela
->r_addend
+= osec
->vma
;
11547 osec
= _bfd_nearby_section (output_bfd
, osec
,
11549 irela
->r_addend
-= osec
->vma
;
11550 r_symndx
= osec
->target_index
;
11555 /* Adjust the addend according to where the
11556 section winds up in the output section. */
11558 irela
->r_addend
+= sec
->output_offset
;
11562 if (flinfo
->indices
[r_symndx
] == -1)
11564 unsigned long shlink
;
11569 if (flinfo
->info
->strip
== strip_all
)
11571 /* You can't do ld -r -s. */
11572 bfd_set_error (bfd_error_invalid_operation
);
11576 /* This symbol was skipped earlier, but
11577 since it is needed by a reloc, we
11578 must output it now. */
11579 shlink
= symtab_hdr
->sh_link
;
11580 name
= (bfd_elf_string_from_elf_section
11581 (input_bfd
, shlink
, sym
.st_name
));
11585 osec
= sec
->output_section
;
11587 _bfd_elf_section_from_bfd_section (output_bfd
,
11589 if (sym
.st_shndx
== SHN_BAD
)
11592 sym
.st_value
+= sec
->output_offset
;
11593 if (!bfd_link_relocatable (flinfo
->info
))
11595 sym
.st_value
+= osec
->vma
;
11596 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11598 struct elf_link_hash_table
*htab
11599 = elf_hash_table (flinfo
->info
);
11601 /* STT_TLS symbols are relative to PT_TLS
11603 if (htab
->tls_sec
!= NULL
)
11604 sym
.st_value
-= htab
->tls_sec
->vma
;
11607 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11612 indx
= bfd_get_symcount (output_bfd
);
11613 ret
= elf_link_output_symstrtab (flinfo
, name
,
11619 flinfo
->indices
[r_symndx
] = indx
;
11624 r_symndx
= flinfo
->indices
[r_symndx
];
11627 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11628 | (irela
->r_info
& r_type_mask
));
11631 /* Swap out the relocs. */
11632 input_rel_hdr
= esdi
->rel
.hdr
;
11633 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11635 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11640 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11641 * bed
->s
->int_rels_per_ext_rel
);
11642 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11645 input_rela_hdr
= esdi
->rela
.hdr
;
11646 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11648 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11657 /* Write out the modified section contents. */
11658 if (bed
->elf_backend_write_section
11659 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11662 /* Section written out. */
11664 else switch (o
->sec_info_type
)
11666 case SEC_INFO_TYPE_STABS
:
11667 if (! (_bfd_write_section_stabs
11669 &elf_hash_table (flinfo
->info
)->stab_info
,
11670 o
, &elf_section_data (o
)->sec_info
, contents
)))
11673 case SEC_INFO_TYPE_MERGE
:
11674 if (! _bfd_write_merged_section (output_bfd
, o
,
11675 elf_section_data (o
)->sec_info
))
11678 case SEC_INFO_TYPE_EH_FRAME
:
11680 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11685 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11687 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11695 if (! (o
->flags
& SEC_EXCLUDE
))
11697 file_ptr offset
= (file_ptr
) o
->output_offset
;
11698 bfd_size_type todo
= o
->size
;
11700 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11702 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11704 /* Reverse-copy input section to output. */
11707 todo
-= address_size
;
11708 if (! bfd_set_section_contents (output_bfd
,
11716 offset
+= address_size
;
11720 else if (! bfd_set_section_contents (output_bfd
,
11734 /* Generate a reloc when linking an ELF file. This is a reloc
11735 requested by the linker, and does not come from any input file. This
11736 is used to build constructor and destructor tables when linking
11740 elf_reloc_link_order (bfd
*output_bfd
,
11741 struct bfd_link_info
*info
,
11742 asection
*output_section
,
11743 struct bfd_link_order
*link_order
)
11745 reloc_howto_type
*howto
;
11749 struct bfd_elf_section_reloc_data
*reldata
;
11750 struct elf_link_hash_entry
**rel_hash_ptr
;
11751 Elf_Internal_Shdr
*rel_hdr
;
11752 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11753 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11756 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11758 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11761 bfd_set_error (bfd_error_bad_value
);
11765 addend
= link_order
->u
.reloc
.p
->addend
;
11768 reldata
= &esdo
->rel
;
11769 else if (esdo
->rela
.hdr
)
11770 reldata
= &esdo
->rela
;
11777 /* Figure out the symbol index. */
11778 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11779 if (link_order
->type
== bfd_section_reloc_link_order
)
11781 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11782 BFD_ASSERT (indx
!= 0);
11783 *rel_hash_ptr
= NULL
;
11787 struct elf_link_hash_entry
*h
;
11789 /* Treat a reloc against a defined symbol as though it were
11790 actually against the section. */
11791 h
= ((struct elf_link_hash_entry
*)
11792 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11793 link_order
->u
.reloc
.p
->u
.name
,
11794 false, false, true));
11796 && (h
->root
.type
== bfd_link_hash_defined
11797 || h
->root
.type
== bfd_link_hash_defweak
))
11801 section
= h
->root
.u
.def
.section
;
11802 indx
= section
->output_section
->target_index
;
11803 *rel_hash_ptr
= NULL
;
11804 /* It seems that we ought to add the symbol value to the
11805 addend here, but in practice it has already been added
11806 because it was passed to constructor_callback. */
11807 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11809 else if (h
!= NULL
)
11811 /* Setting the index to -2 tells elf_link_output_extsym that
11812 this symbol is used by a reloc. */
11819 (*info
->callbacks
->unattached_reloc
)
11820 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11825 /* If this is an inplace reloc, we must write the addend into the
11827 if (howto
->partial_inplace
&& addend
!= 0)
11829 bfd_size_type size
;
11830 bfd_reloc_status_type rstat
;
11833 const char *sym_name
;
11834 bfd_size_type octets
;
11836 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11837 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11838 if (buf
== NULL
&& size
!= 0)
11840 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11847 case bfd_reloc_outofrange
:
11850 case bfd_reloc_overflow
:
11851 if (link_order
->type
== bfd_section_reloc_link_order
)
11852 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11854 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11855 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11856 howto
->name
, addend
, NULL
, NULL
,
11861 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11863 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11870 /* The address of a reloc is relative to the section in a
11871 relocatable file, and is a virtual address in an executable
11873 offset
= link_order
->offset
;
11874 if (! bfd_link_relocatable (info
))
11875 offset
+= output_section
->vma
;
11877 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11879 irel
[i
].r_offset
= offset
;
11880 irel
[i
].r_info
= 0;
11881 irel
[i
].r_addend
= 0;
11883 if (bed
->s
->arch_size
== 32)
11884 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11886 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11888 rel_hdr
= reldata
->hdr
;
11889 erel
= rel_hdr
->contents
;
11890 if (rel_hdr
->sh_type
== SHT_REL
)
11892 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11893 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11897 irel
[0].r_addend
= addend
;
11898 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11899 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11907 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11908 Returns TRUE upon success, FALSE otherwise. */
11911 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11915 const struct elf_backend_data
*bed
;
11917 enum bfd_architecture arch
;
11919 asymbol
**sympp
= NULL
;
11923 elf_symbol_type
*osymbuf
;
11926 implib_bfd
= info
->out_implib_bfd
;
11927 bed
= get_elf_backend_data (abfd
);
11929 if (!bfd_set_format (implib_bfd
, bfd_object
))
11932 /* Use flag from executable but make it a relocatable object. */
11933 flags
= bfd_get_file_flags (abfd
);
11934 flags
&= ~HAS_RELOC
;
11935 if (!bfd_set_start_address (implib_bfd
, 0)
11936 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11939 /* Copy architecture of output file to import library file. */
11940 arch
= bfd_get_arch (abfd
);
11941 mach
= bfd_get_mach (abfd
);
11942 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11943 && (abfd
->target_defaulted
11944 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11947 /* Get symbol table size. */
11948 symsize
= bfd_get_symtab_upper_bound (abfd
);
11952 /* Read in the symbol table. */
11953 sympp
= (asymbol
**) bfd_malloc (symsize
);
11957 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11961 /* Allow the BFD backend to copy any private header data it
11962 understands from the output BFD to the import library BFD. */
11963 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11966 /* Filter symbols to appear in the import library. */
11967 if (bed
->elf_backend_filter_implib_symbols
)
11968 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11971 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11974 bfd_set_error (bfd_error_no_symbols
);
11975 _bfd_error_handler (_("%pB: no symbol found for import library"),
11981 /* Make symbols absolute. */
11982 amt
= symcount
* sizeof (*osymbuf
);
11983 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11984 if (osymbuf
== NULL
)
11987 for (src_count
= 0; src_count
< symcount
; src_count
++)
11989 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11990 sizeof (*osymbuf
));
11991 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11992 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11993 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11994 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11995 osymbuf
[src_count
].symbol
.value
;
11996 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11999 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
12001 /* Allow the BFD backend to copy any private data it understands
12002 from the output BFD to the import library BFD. This is done last
12003 to permit the routine to look at the filtered symbol table. */
12004 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
12007 if (!bfd_close (implib_bfd
))
12018 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
12022 if (flinfo
->symstrtab
!= NULL
)
12023 _bfd_elf_strtab_free (flinfo
->symstrtab
);
12024 free (flinfo
->contents
);
12025 free (flinfo
->external_relocs
);
12026 free (flinfo
->internal_relocs
);
12027 free (flinfo
->external_syms
);
12028 free (flinfo
->locsym_shndx
);
12029 free (flinfo
->internal_syms
);
12030 free (flinfo
->indices
);
12031 free (flinfo
->sections
);
12032 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
12033 free (flinfo
->symshndxbuf
);
12034 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
12036 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12037 free (esdo
->rel
.hashes
);
12038 free (esdo
->rela
.hashes
);
12042 /* Do the final step of an ELF link. */
12045 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12050 struct elf_final_link_info flinfo
;
12052 struct bfd_link_order
*p
;
12054 bfd_size_type max_contents_size
;
12055 bfd_size_type max_external_reloc_size
;
12056 bfd_size_type max_internal_reloc_count
;
12057 bfd_size_type max_sym_count
;
12058 bfd_size_type max_sym_shndx_count
;
12059 Elf_Internal_Sym elfsym
;
12061 Elf_Internal_Shdr
*symtab_hdr
;
12062 Elf_Internal_Shdr
*symtab_shndx_hdr
;
12063 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12064 struct elf_outext_info eoinfo
;
12066 size_t relativecount
= 0;
12067 asection
*reldyn
= 0;
12069 asection
*attr_section
= NULL
;
12070 bfd_vma attr_size
= 0;
12071 const char *std_attrs_section
;
12072 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
12073 bool sections_removed
;
12076 if (!is_elf_hash_table (&htab
->root
))
12079 if (bfd_link_pic (info
))
12080 abfd
->flags
|= DYNAMIC
;
12082 dynamic
= htab
->dynamic_sections_created
;
12083 dynobj
= htab
->dynobj
;
12085 emit_relocs
= (bfd_link_relocatable (info
)
12086 || info
->emitrelocations
);
12088 memset (&flinfo
, 0, sizeof (flinfo
));
12089 flinfo
.info
= info
;
12090 flinfo
.output_bfd
= abfd
;
12091 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
12092 if (flinfo
.symstrtab
== NULL
)
12097 flinfo
.hash_sec
= NULL
;
12098 flinfo
.symver_sec
= NULL
;
12102 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
12103 /* Note that dynsym_sec can be NULL (on VMS). */
12104 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
12105 /* Note that it is OK if symver_sec is NULL. */
12108 if (info
->unique_symbol
12109 && !bfd_hash_table_init (&flinfo
.local_hash_table
,
12110 local_hash_newfunc
,
12111 sizeof (struct local_hash_entry
)))
12114 /* The object attributes have been merged. Remove the input
12115 sections from the link, and set the contents of the output
12117 sections_removed
= false;
12118 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
12119 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12121 bool remove_section
= false;
12123 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
12124 || strcmp (o
->name
, ".gnu.attributes") == 0)
12126 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12128 asection
*input_section
;
12130 if (p
->type
!= bfd_indirect_link_order
)
12132 input_section
= p
->u
.indirect
.section
;
12133 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12134 elf_link_input_bfd ignores this section. */
12135 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12138 attr_size
= bfd_elf_obj_attr_size (abfd
);
12139 bfd_set_section_size (o
, attr_size
);
12140 /* Skip this section later on. */
12141 o
->map_head
.link_order
= NULL
;
12145 remove_section
= true;
12147 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12149 /* Remove empty group section from linker output. */
12150 remove_section
= true;
12152 if (remove_section
)
12154 o
->flags
|= SEC_EXCLUDE
;
12155 bfd_section_list_remove (abfd
, o
);
12156 abfd
->section_count
--;
12157 sections_removed
= true;
12160 if (sections_removed
)
12161 _bfd_fix_excluded_sec_syms (abfd
, info
);
12163 /* Count up the number of relocations we will output for each output
12164 section, so that we know the sizes of the reloc sections. We
12165 also figure out some maximum sizes. */
12166 max_contents_size
= 0;
12167 max_external_reloc_size
= 0;
12168 max_internal_reloc_count
= 0;
12170 max_sym_shndx_count
= 0;
12172 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12174 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12175 o
->reloc_count
= 0;
12177 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12179 unsigned int reloc_count
= 0;
12180 unsigned int additional_reloc_count
= 0;
12181 struct bfd_elf_section_data
*esdi
= NULL
;
12183 if (p
->type
== bfd_section_reloc_link_order
12184 || p
->type
== bfd_symbol_reloc_link_order
)
12186 else if (p
->type
== bfd_indirect_link_order
)
12190 sec
= p
->u
.indirect
.section
;
12192 /* Mark all sections which are to be included in the
12193 link. This will normally be every section. We need
12194 to do this so that we can identify any sections which
12195 the linker has decided to not include. */
12196 sec
->linker_mark
= true;
12198 if (sec
->flags
& SEC_MERGE
)
12201 if (sec
->rawsize
> max_contents_size
)
12202 max_contents_size
= sec
->rawsize
;
12203 if (sec
->size
> max_contents_size
)
12204 max_contents_size
= sec
->size
;
12206 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12207 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12211 /* We are interested in just local symbols, not all
12213 if (elf_bad_symtab (sec
->owner
))
12214 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12215 / bed
->s
->sizeof_sym
);
12217 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12219 if (sym_count
> max_sym_count
)
12220 max_sym_count
= sym_count
;
12222 if (sym_count
> max_sym_shndx_count
12223 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12224 max_sym_shndx_count
= sym_count
;
12226 if (esdo
->this_hdr
.sh_type
== SHT_REL
12227 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12228 /* Some backends use reloc_count in relocation sections
12229 to count particular types of relocs. Of course,
12230 reloc sections themselves can't have relocations. */
12232 else if (emit_relocs
)
12234 reloc_count
= sec
->reloc_count
;
12235 if (bed
->elf_backend_count_additional_relocs
)
12238 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12239 additional_reloc_count
+= c
;
12242 else if (bed
->elf_backend_count_relocs
)
12243 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12245 esdi
= elf_section_data (sec
);
12247 if ((sec
->flags
& SEC_RELOC
) != 0)
12249 size_t ext_size
= 0;
12251 if (esdi
->rel
.hdr
!= NULL
)
12252 ext_size
= esdi
->rel
.hdr
->sh_size
;
12253 if (esdi
->rela
.hdr
!= NULL
)
12254 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12256 if (ext_size
> max_external_reloc_size
)
12257 max_external_reloc_size
= ext_size
;
12258 if (sec
->reloc_count
> max_internal_reloc_count
)
12259 max_internal_reloc_count
= sec
->reloc_count
;
12264 if (reloc_count
== 0)
12267 reloc_count
+= additional_reloc_count
;
12268 o
->reloc_count
+= reloc_count
;
12270 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12274 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12275 esdo
->rel
.count
+= additional_reloc_count
;
12277 if (esdi
->rela
.hdr
)
12279 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12280 esdo
->rela
.count
+= additional_reloc_count
;
12286 esdo
->rela
.count
+= reloc_count
;
12288 esdo
->rel
.count
+= reloc_count
;
12292 if (o
->reloc_count
> 0)
12293 o
->flags
|= SEC_RELOC
;
12296 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12297 set it (this is probably a bug) and if it is set
12298 assign_section_numbers will create a reloc section. */
12299 o
->flags
&=~ SEC_RELOC
;
12302 /* If the SEC_ALLOC flag is not set, force the section VMA to
12303 zero. This is done in elf_fake_sections as well, but forcing
12304 the VMA to 0 here will ensure that relocs against these
12305 sections are handled correctly. */
12306 if ((o
->flags
& SEC_ALLOC
) == 0
12307 && ! o
->user_set_vma
)
12311 if (! bfd_link_relocatable (info
) && merged
)
12312 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12314 /* Figure out the file positions for everything but the symbol table
12315 and the relocs. We set symcount to force assign_section_numbers
12316 to create a symbol table. */
12317 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12318 BFD_ASSERT (! abfd
->output_has_begun
);
12319 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12322 /* Set sizes, and assign file positions for reloc sections. */
12323 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12325 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12326 if ((o
->flags
& SEC_RELOC
) != 0)
12329 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12333 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12337 /* _bfd_elf_compute_section_file_positions makes temporary use
12338 of target_index. Reset it. */
12339 o
->target_index
= 0;
12341 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12342 to count upwards while actually outputting the relocations. */
12343 esdo
->rel
.count
= 0;
12344 esdo
->rela
.count
= 0;
12346 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12347 && !bfd_section_is_ctf (o
))
12349 /* Cache the section contents so that they can be compressed
12350 later. Use bfd_malloc since it will be freed by
12351 bfd_compress_section_contents. */
12352 unsigned char *contents
= esdo
->this_hdr
.contents
;
12353 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12356 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12357 if (contents
== NULL
)
12359 esdo
->this_hdr
.contents
= contents
;
12363 /* We have now assigned file positions for all the sections except .symtab,
12364 .strtab, and non-loaded reloc and compressed debugging sections. We start
12365 the .symtab section at the current file position, and write directly to it.
12366 We build the .strtab section in memory. */
12367 abfd
->symcount
= 0;
12368 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12369 /* sh_name is set in prep_headers. */
12370 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12371 /* sh_flags, sh_addr and sh_size all start off zero. */
12372 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12373 /* sh_link is set in assign_section_numbers. */
12374 /* sh_info is set below. */
12375 /* sh_offset is set just below. */
12376 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12378 if (max_sym_count
< 20)
12379 max_sym_count
= 20;
12380 htab
->strtabsize
= max_sym_count
;
12381 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12382 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12383 if (htab
->strtab
== NULL
)
12385 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12387 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12388 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12390 if (info
->strip
!= strip_all
|| emit_relocs
)
12392 file_ptr off
= elf_next_file_pos (abfd
);
12394 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
12396 /* Note that at this point elf_next_file_pos (abfd) is
12397 incorrect. We do not yet know the size of the .symtab section.
12398 We correct next_file_pos below, after we do know the size. */
12400 /* Start writing out the symbol table. The first symbol is always a
12402 elfsym
.st_value
= 0;
12403 elfsym
.st_size
= 0;
12404 elfsym
.st_info
= 0;
12405 elfsym
.st_other
= 0;
12406 elfsym
.st_shndx
= SHN_UNDEF
;
12407 elfsym
.st_target_internal
= 0;
12408 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12409 bfd_und_section_ptr
, NULL
) != 1)
12412 /* Output a symbol for each section if asked or they are used for
12413 relocs. These symbols usually have no names. We store the
12414 index of each one in the index field of the section, so that
12415 we can find it again when outputting relocs. */
12417 if (bfd_keep_unused_section_symbols (abfd
) || emit_relocs
)
12419 bool name_local_sections
12420 = (bed
->elf_backend_name_local_section_symbols
12421 && bed
->elf_backend_name_local_section_symbols (abfd
));
12422 const char *name
= NULL
;
12424 elfsym
.st_size
= 0;
12425 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12426 elfsym
.st_other
= 0;
12427 elfsym
.st_value
= 0;
12428 elfsym
.st_target_internal
= 0;
12429 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12431 o
= bfd_section_from_elf_index (abfd
, i
);
12434 o
->target_index
= bfd_get_symcount (abfd
);
12435 elfsym
.st_shndx
= i
;
12436 if (!bfd_link_relocatable (info
))
12437 elfsym
.st_value
= o
->vma
;
12438 if (name_local_sections
)
12440 if (elf_link_output_symstrtab (&flinfo
, name
, &elfsym
, o
,
12448 /* On some targets like Irix 5 the symbol split between local and global
12449 ones recorded in the sh_info field needs to be done between section
12450 and all other symbols. */
12451 if (bed
->elf_backend_elfsym_local_is_section
12452 && bed
->elf_backend_elfsym_local_is_section (abfd
))
12453 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12455 /* Allocate some memory to hold information read in from the input
12457 if (max_contents_size
!= 0)
12459 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12460 if (flinfo
.contents
== NULL
)
12464 if (max_external_reloc_size
!= 0)
12466 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12467 if (flinfo
.external_relocs
== NULL
)
12471 if (max_internal_reloc_count
!= 0)
12473 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12474 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12475 if (flinfo
.internal_relocs
== NULL
)
12479 if (max_sym_count
!= 0)
12481 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12482 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12483 if (flinfo
.external_syms
== NULL
)
12486 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12487 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12488 if (flinfo
.internal_syms
== NULL
)
12491 amt
= max_sym_count
* sizeof (long);
12492 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12493 if (flinfo
.indices
== NULL
)
12496 amt
= max_sym_count
* sizeof (asection
*);
12497 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12498 if (flinfo
.sections
== NULL
)
12502 if (max_sym_shndx_count
!= 0)
12504 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12505 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12506 if (flinfo
.locsym_shndx
== NULL
)
12512 bfd_vma base
, end
= 0; /* Both bytes. */
12515 for (sec
= htab
->tls_sec
;
12516 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12519 bfd_size_type size
= sec
->size
;
12520 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12523 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12525 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12528 size
= ord
->offset
* opb
+ ord
->size
;
12530 end
= sec
->vma
+ size
/ opb
;
12532 base
= htab
->tls_sec
->vma
;
12533 /* Only align end of TLS section if static TLS doesn't have special
12534 alignment requirements. */
12535 if (bed
->static_tls_alignment
== 1)
12536 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12537 htab
->tls_size
= end
- base
;
12540 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12543 /* Since ELF permits relocations to be against local symbols, we
12544 must have the local symbols available when we do the relocations.
12545 Since we would rather only read the local symbols once, and we
12546 would rather not keep them in memory, we handle all the
12547 relocations for a single input file at the same time.
12549 Unfortunately, there is no way to know the total number of local
12550 symbols until we have seen all of them, and the local symbol
12551 indices precede the global symbol indices. This means that when
12552 we are generating relocatable output, and we see a reloc against
12553 a global symbol, we can not know the symbol index until we have
12554 finished examining all the local symbols to see which ones we are
12555 going to output. To deal with this, we keep the relocations in
12556 memory, and don't output them until the end of the link. This is
12557 an unfortunate waste of memory, but I don't see a good way around
12558 it. Fortunately, it only happens when performing a relocatable
12559 link, which is not the common case. FIXME: If keep_memory is set
12560 we could write the relocs out and then read them again; I don't
12561 know how bad the memory loss will be. */
12563 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12564 sub
->output_has_begun
= false;
12565 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12567 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12569 if (p
->type
== bfd_indirect_link_order
12570 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12571 == bfd_target_elf_flavour
)
12572 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12574 if (! sub
->output_has_begun
)
12576 if (! elf_link_input_bfd (&flinfo
, sub
))
12578 sub
->output_has_begun
= true;
12581 else if (p
->type
== bfd_section_reloc_link_order
12582 || p
->type
== bfd_symbol_reloc_link_order
)
12584 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12589 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12591 if (p
->type
== bfd_indirect_link_order
12592 && (bfd_get_flavour (sub
)
12593 == bfd_target_elf_flavour
)
12594 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12595 != bed
->s
->elfclass
))
12597 const char *iclass
, *oclass
;
12599 switch (bed
->s
->elfclass
)
12601 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12602 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12603 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12607 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12609 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12610 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12611 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12615 bfd_set_error (bfd_error_wrong_format
);
12617 /* xgettext:c-format */
12618 (_("%pB: file class %s incompatible with %s"),
12619 sub
, iclass
, oclass
);
12628 /* Free symbol buffer if needed. */
12629 if (!info
->reduce_memory_overheads
)
12631 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12632 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12634 free (elf_tdata (sub
)->symbuf
);
12635 elf_tdata (sub
)->symbuf
= NULL
;
12641 /* Output any global symbols that got converted to local in a
12642 version script or due to symbol visibility. We do this in a
12643 separate step since ELF requires all local symbols to appear
12644 prior to any global symbols. FIXME: We should only do this if
12645 some global symbols were, in fact, converted to become local.
12646 FIXME: Will this work correctly with the Irix 5 linker? */
12647 eoinfo
.failed
= false;
12648 eoinfo
.flinfo
= &flinfo
;
12649 eoinfo
.localsyms
= true;
12650 eoinfo
.file_sym_done
= false;
12651 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12655 goto return_local_hash_table
;
12658 /* If backend needs to output some local symbols not present in the hash
12659 table, do it now. */
12660 if (bed
->elf_backend_output_arch_local_syms
12661 && (info
->strip
!= strip_all
|| emit_relocs
))
12663 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12664 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
12667 goto return_local_hash_table
;
12671 /* That wrote out all the local symbols. Finish up the symbol table
12672 with the global symbols. Even if we want to strip everything we
12673 can, we still need to deal with those global symbols that got
12674 converted to local in a version script. */
12676 /* The sh_info field records the index of the first non local symbol. */
12677 if (!symtab_hdr
->sh_info
)
12678 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12681 && htab
->dynsym
!= NULL
12682 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12684 Elf_Internal_Sym sym
;
12685 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12687 o
= htab
->dynsym
->output_section
;
12688 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12690 /* Write out the section symbols for the output sections. */
12691 if (bfd_link_pic (info
)
12692 || htab
->is_relocatable_executable
)
12698 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12700 sym
.st_target_internal
= 0;
12702 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12708 dynindx
= elf_section_data (s
)->dynindx
;
12711 indx
= elf_section_data (s
)->this_idx
;
12712 BFD_ASSERT (indx
> 0);
12713 sym
.st_shndx
= indx
;
12714 if (! check_dynsym (abfd
, &sym
))
12717 goto return_local_hash_table
;
12719 sym
.st_value
= s
->vma
;
12720 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12722 /* Inform the linker of the addition of this symbol. */
12724 if (info
->callbacks
->ctf_new_dynsym
)
12725 info
->callbacks
->ctf_new_dynsym (dynindx
, &sym
);
12727 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12731 /* Write out the local dynsyms. */
12732 if (htab
->dynlocal
)
12734 struct elf_link_local_dynamic_entry
*e
;
12735 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12740 /* Copy the internal symbol and turn off visibility.
12741 Note that we saved a word of storage and overwrote
12742 the original st_name with the dynstr_index. */
12744 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12745 sym
.st_shndx
= SHN_UNDEF
;
12747 s
= bfd_section_from_elf_index (e
->input_bfd
,
12750 && s
->output_section
!= NULL
12751 && elf_section_data (s
->output_section
) != NULL
)
12754 elf_section_data (s
->output_section
)->this_idx
;
12755 if (! check_dynsym (abfd
, &sym
))
12758 goto return_local_hash_table
;
12760 sym
.st_value
= (s
->output_section
->vma
12762 + e
->isym
.st_value
);
12765 /* Inform the linker of the addition of this symbol. */
12767 if (info
->callbacks
->ctf_new_dynsym
)
12768 info
->callbacks
->ctf_new_dynsym (e
->dynindx
, &sym
);
12770 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12771 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12776 /* We get the global symbols from the hash table. */
12777 eoinfo
.failed
= false;
12778 eoinfo
.localsyms
= false;
12779 eoinfo
.flinfo
= &flinfo
;
12780 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12784 goto return_local_hash_table
;
12787 /* If backend needs to output some symbols not present in the hash
12788 table, do it now. */
12789 if (bed
->elf_backend_output_arch_syms
12790 && (info
->strip
!= strip_all
|| emit_relocs
))
12792 if (! ((*bed
->elf_backend_output_arch_syms
)
12793 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
12796 goto return_local_hash_table
;
12800 /* Finalize the .strtab section. */
12801 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12803 /* Swap out the .strtab section. */
12804 if (!elf_link_swap_symbols_out (&flinfo
))
12807 goto return_local_hash_table
;
12810 /* Now we know the size of the symtab section. */
12811 if (bfd_get_symcount (abfd
) > 0)
12813 /* Finish up and write out the symbol string table (.strtab)
12815 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12816 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12818 if (elf_symtab_shndx_list (abfd
))
12820 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12822 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12824 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12825 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12826 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12827 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12828 symtab_shndx_hdr
->sh_size
= amt
;
12830 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12833 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12834 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12837 goto return_local_hash_table
;
12842 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12843 /* sh_name was set in prep_headers. */
12844 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12845 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12846 symstrtab_hdr
->sh_addr
= 0;
12847 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12848 symstrtab_hdr
->sh_entsize
= 0;
12849 symstrtab_hdr
->sh_link
= 0;
12850 symstrtab_hdr
->sh_info
= 0;
12851 /* sh_offset is set just below. */
12852 symstrtab_hdr
->sh_addralign
= 1;
12854 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12856 elf_next_file_pos (abfd
) = off
;
12858 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12859 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12862 goto return_local_hash_table
;
12866 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12868 _bfd_error_handler (_("%pB: failed to generate import library"),
12869 info
->out_implib_bfd
);
12871 goto return_local_hash_table
;
12874 /* Adjust the relocs to have the correct symbol indices. */
12875 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12877 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12880 if ((o
->flags
& SEC_RELOC
) == 0)
12883 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12884 if (esdo
->rel
.hdr
!= NULL
12885 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12888 goto return_local_hash_table
;
12890 if (esdo
->rela
.hdr
!= NULL
12891 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12894 goto return_local_hash_table
;
12897 /* Set the reloc_count field to 0 to prevent write_relocs from
12898 trying to swap the relocs out itself. */
12899 o
->reloc_count
= 0;
12902 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12903 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12905 /* If we are linking against a dynamic object, or generating a
12906 shared library, finish up the dynamic linking information. */
12909 bfd_byte
*dyncon
, *dynconend
;
12911 /* Fix up .dynamic entries. */
12912 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12913 BFD_ASSERT (o
!= NULL
);
12915 dyncon
= o
->contents
;
12916 dynconend
= o
->contents
+ o
->size
;
12917 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12919 Elf_Internal_Dyn dyn
;
12922 bfd_size_type sh_size
;
12925 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12932 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12934 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12936 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12937 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12940 dyn
.d_un
.d_val
= relativecount
;
12947 name
= info
->init_function
;
12950 name
= info
->fini_function
;
12953 struct elf_link_hash_entry
*h
;
12955 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
12957 && (h
->root
.type
== bfd_link_hash_defined
12958 || h
->root
.type
== bfd_link_hash_defweak
))
12960 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12961 o
= h
->root
.u
.def
.section
;
12962 if (o
->output_section
!= NULL
)
12963 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12964 + o
->output_offset
);
12967 /* The symbol is imported from another shared
12968 library and does not apply to this one. */
12969 dyn
.d_un
.d_ptr
= 0;
12976 case DT_PREINIT_ARRAYSZ
:
12977 name
= ".preinit_array";
12979 case DT_INIT_ARRAYSZ
:
12980 name
= ".init_array";
12982 case DT_FINI_ARRAYSZ
:
12983 name
= ".fini_array";
12985 o
= bfd_get_section_by_name (abfd
, name
);
12989 (_("could not find section %s"), name
);
12994 (_("warning: %s section has zero size"), name
);
12995 dyn
.d_un
.d_val
= o
->size
;
12998 case DT_PREINIT_ARRAY
:
12999 name
= ".preinit_array";
13001 case DT_INIT_ARRAY
:
13002 name
= ".init_array";
13004 case DT_FINI_ARRAY
:
13005 name
= ".fini_array";
13007 o
= bfd_get_section_by_name (abfd
, name
);
13014 name
= ".gnu.hash";
13023 name
= ".gnu.version_d";
13026 name
= ".gnu.version_r";
13029 name
= ".gnu.version";
13031 o
= bfd_get_linker_section (dynobj
, name
);
13033 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
13036 (_("could not find section %s"), name
);
13039 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
13042 (_("warning: section '%s' is being made into a note"), name
);
13043 bfd_set_error (bfd_error_nonrepresentable_section
);
13046 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
13053 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
13059 for (i
= 1; i
< elf_numsections (abfd
); i
++)
13061 Elf_Internal_Shdr
*hdr
;
13063 hdr
= elf_elfsections (abfd
)[i
];
13064 if (hdr
->sh_type
== type
13065 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
13067 sh_size
+= hdr
->sh_size
;
13069 || sh_addr
> hdr
->sh_addr
)
13070 sh_addr
= hdr
->sh_addr
;
13074 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
13076 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
13078 /* Don't count procedure linkage table relocs in the
13079 overall reloc count. */
13080 sh_size
-= htab
->srelplt
->size
;
13082 /* If the size is zero, make the address zero too.
13083 This is to avoid a glibc bug. If the backend
13084 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
13085 zero, then we'll put DT_RELA at the end of
13086 DT_JMPREL. glibc will interpret the end of
13087 DT_RELA matching the end of DT_JMPREL as the
13088 case where DT_RELA includes DT_JMPREL, and for
13089 LD_BIND_NOW will decide that processing DT_RELA
13090 will process the PLT relocs too. Net result:
13091 No PLT relocs applied. */
13094 /* If .rela.plt is the first .rela section, exclude
13095 it from DT_RELA. */
13096 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
13097 + htab
->srelplt
->output_offset
) * opb
)
13098 sh_addr
+= htab
->srelplt
->size
;
13101 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
13102 dyn
.d_un
.d_val
= sh_size
;
13104 dyn
.d_un
.d_ptr
= sh_addr
;
13107 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13111 /* If we have created any dynamic sections, then output them. */
13112 if (dynobj
!= NULL
)
13114 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
13117 /* Check for DT_TEXTREL (late, in case the backend removes it). */
13118 if (bfd_link_textrel_check (info
)
13119 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
13121 bfd_byte
*dyncon
, *dynconend
;
13123 dyncon
= o
->contents
;
13124 dynconend
= o
->contents
+ o
->size
;
13125 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13127 Elf_Internal_Dyn dyn
;
13129 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13131 if (dyn
.d_tag
== DT_TEXTREL
)
13133 if (info
->textrel_check
== textrel_check_error
)
13134 info
->callbacks
->einfo
13135 (_("%P%X: read-only segment has dynamic relocations\n"));
13136 else if (bfd_link_dll (info
))
13137 info
->callbacks
->einfo
13138 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
13140 info
->callbacks
->einfo
13141 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
13147 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
13149 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
13151 || o
->output_section
== bfd_abs_section_ptr
)
13153 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
13155 /* At this point, we are only interested in sections
13156 created by _bfd_elf_link_create_dynamic_sections. */
13159 if (htab
->stab_info
.stabstr
== o
)
13161 if (htab
->eh_info
.hdr_sec
== o
)
13163 if (strcmp (o
->name
, ".dynstr") != 0)
13165 bfd_size_type octets
= ((file_ptr
) o
->output_offset
13166 * bfd_octets_per_byte (abfd
, o
));
13167 if (!bfd_set_section_contents (abfd
, o
->output_section
,
13168 o
->contents
, octets
, o
->size
))
13173 /* The contents of the .dynstr section are actually in a
13177 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
13178 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
13179 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13185 if (!info
->resolve_section_groups
)
13187 bool failed
= false;
13189 BFD_ASSERT (bfd_link_relocatable (info
));
13190 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13195 /* If we have optimized stabs strings, output them. */
13196 if (htab
->stab_info
.stabstr
!= NULL
)
13198 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13202 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13205 if (info
->callbacks
->emit_ctf
)
13206 info
->callbacks
->emit_ctf ();
13208 elf_final_link_free (abfd
, &flinfo
);
13212 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13213 if (contents
== NULL
)
13215 /* Bail out and fail. */
13217 goto return_local_hash_table
;
13219 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13220 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13224 return_local_hash_table
:
13225 if (info
->unique_symbol
)
13226 bfd_hash_table_free (&flinfo
.local_hash_table
);
13230 elf_final_link_free (abfd
, &flinfo
);
13232 goto return_local_hash_table
;
13235 /* Initialize COOKIE for input bfd ABFD. */
13238 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13239 struct bfd_link_info
*info
, bfd
*abfd
)
13241 Elf_Internal_Shdr
*symtab_hdr
;
13242 const struct elf_backend_data
*bed
;
13244 bed
= get_elf_backend_data (abfd
);
13245 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13247 cookie
->abfd
= abfd
;
13248 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13249 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13250 if (cookie
->bad_symtab
)
13252 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13253 cookie
->extsymoff
= 0;
13257 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13258 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13261 if (bed
->s
->arch_size
== 32)
13262 cookie
->r_sym_shift
= 8;
13264 cookie
->r_sym_shift
= 32;
13266 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13267 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13269 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13270 cookie
->locsymcount
, 0,
13272 if (cookie
->locsyms
== NULL
)
13274 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13277 if (info
->keep_memory
)
13278 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13283 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13286 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13288 Elf_Internal_Shdr
*symtab_hdr
;
13290 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13291 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13292 free (cookie
->locsyms
);
13295 /* Initialize the relocation information in COOKIE for input section SEC
13296 of input bfd ABFD. */
13299 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13300 struct bfd_link_info
*info
, bfd
*abfd
,
13303 if (sec
->reloc_count
== 0)
13305 cookie
->rels
= NULL
;
13306 cookie
->relend
= NULL
;
13310 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13311 info
->keep_memory
);
13312 if (cookie
->rels
== NULL
)
13314 cookie
->rel
= cookie
->rels
;
13315 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13317 cookie
->rel
= cookie
->rels
;
13321 /* Free the memory allocated by init_reloc_cookie_rels,
13325 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13328 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13329 free (cookie
->rels
);
13332 /* Initialize the whole of COOKIE for input section SEC. */
13335 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13336 struct bfd_link_info
*info
,
13339 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13341 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13346 fini_reloc_cookie (cookie
, sec
->owner
);
13351 /* Free the memory allocated by init_reloc_cookie_for_section,
13355 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13358 fini_reloc_cookie_rels (cookie
, sec
);
13359 fini_reloc_cookie (cookie
, sec
->owner
);
13362 /* Garbage collect unused sections. */
13364 /* Default gc_mark_hook. */
13367 _bfd_elf_gc_mark_hook (asection
*sec
,
13368 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13369 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13370 struct elf_link_hash_entry
*h
,
13371 Elf_Internal_Sym
*sym
)
13375 switch (h
->root
.type
)
13377 case bfd_link_hash_defined
:
13378 case bfd_link_hash_defweak
:
13379 return h
->root
.u
.def
.section
;
13381 case bfd_link_hash_common
:
13382 return h
->root
.u
.c
.p
->section
;
13389 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13394 /* Return the debug definition section. */
13397 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13398 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13399 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13400 struct elf_link_hash_entry
*h
,
13401 Elf_Internal_Sym
*sym
)
13405 /* Return the global debug definition section. */
13406 if ((h
->root
.type
== bfd_link_hash_defined
13407 || h
->root
.type
== bfd_link_hash_defweak
)
13408 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13409 return h
->root
.u
.def
.section
;
13413 /* Return the local debug definition section. */
13414 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13416 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13423 /* COOKIE->rel describes a relocation against section SEC, which is
13424 a section we've decided to keep. Return the section that contains
13425 the relocation symbol, or NULL if no section contains it. */
13428 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13429 elf_gc_mark_hook_fn gc_mark_hook
,
13430 struct elf_reloc_cookie
*cookie
,
13433 unsigned long r_symndx
;
13434 struct elf_link_hash_entry
*h
, *hw
;
13436 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13437 if (r_symndx
== STN_UNDEF
)
13440 if (r_symndx
>= cookie
->locsymcount
13441 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13445 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13448 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13452 while (h
->root
.type
== bfd_link_hash_indirect
13453 || h
->root
.type
== bfd_link_hash_warning
)
13454 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13456 was_marked
= h
->mark
;
13458 /* Keep all aliases of the symbol too. If an object symbol
13459 needs to be copied into .dynbss then all of its aliases
13460 should be present as dynamic symbols, not just the one used
13461 on the copy relocation. */
13463 while (hw
->is_weakalias
)
13469 if (!was_marked
&& h
->start_stop
&& !h
->root
.ldscript_def
)
13471 if (info
->start_stop_gc
)
13474 /* To work around a glibc bug, mark XXX input sections
13475 when there is a reference to __start_XXX or __stop_XXX
13477 else if (start_stop
!= NULL
)
13479 asection
*s
= h
->u2
.start_stop_section
;
13480 *start_stop
= true;
13485 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13488 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13489 &cookie
->locsyms
[r_symndx
]);
13492 /* COOKIE->rel describes a relocation against section SEC, which is
13493 a section we've decided to keep. Mark the section that contains
13494 the relocation symbol. */
13497 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13499 elf_gc_mark_hook_fn gc_mark_hook
,
13500 struct elf_reloc_cookie
*cookie
)
13503 bool start_stop
= false;
13505 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13506 while (rsec
!= NULL
)
13508 if (!rsec
->gc_mark
)
13510 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13511 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13513 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13518 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13523 /* The mark phase of garbage collection. For a given section, mark
13524 it and any sections in this section's group, and all the sections
13525 which define symbols to which it refers. */
13528 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13530 elf_gc_mark_hook_fn gc_mark_hook
)
13533 asection
*group_sec
, *eh_frame
;
13537 /* Mark all the sections in the group. */
13538 group_sec
= elf_section_data (sec
)->next_in_group
;
13539 if (group_sec
&& !group_sec
->gc_mark
)
13540 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13543 /* Look through the section relocs. */
13545 eh_frame
= elf_eh_frame_section (sec
->owner
);
13546 if ((sec
->flags
& SEC_RELOC
) != 0
13547 && sec
->reloc_count
> 0
13548 && sec
!= eh_frame
)
13550 struct elf_reloc_cookie cookie
;
13552 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13556 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13557 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13562 fini_reloc_cookie_for_section (&cookie
, sec
);
13566 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13568 struct elf_reloc_cookie cookie
;
13570 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13574 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13575 gc_mark_hook
, &cookie
))
13577 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13581 eh_frame
= elf_section_eh_frame_entry (sec
);
13582 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13583 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13589 /* Scan and mark sections in a special or debug section group. */
13592 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13594 /* Point to first section of section group. */
13596 /* Used to iterate the section group. */
13599 bool is_special_grp
= true;
13600 bool is_debug_grp
= true;
13602 /* First scan to see if group contains any section other than debug
13603 and special section. */
13604 ssec
= msec
= elf_next_in_group (grp
);
13607 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13608 is_debug_grp
= false;
13610 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13611 is_special_grp
= false;
13613 msec
= elf_next_in_group (msec
);
13615 while (msec
!= ssec
);
13617 /* If this is a pure debug section group or pure special section group,
13618 keep all sections in this group. */
13619 if (is_debug_grp
|| is_special_grp
)
13624 msec
= elf_next_in_group (msec
);
13626 while (msec
!= ssec
);
13630 /* Keep debug and special sections. */
13633 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13634 elf_gc_mark_hook_fn mark_hook
)
13638 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13642 bool debug_frag_seen
;
13643 bool has_kept_debug_info
;
13645 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13647 isec
= ibfd
->sections
;
13648 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13651 /* Ensure all linker created sections are kept,
13652 see if any other section is already marked,
13653 and note if we have any fragmented debug sections. */
13654 debug_frag_seen
= some_kept
= has_kept_debug_info
= false;
13655 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13657 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13659 else if (isec
->gc_mark
13660 && (isec
->flags
& SEC_ALLOC
) != 0
13661 && elf_section_type (isec
) != SHT_NOTE
)
13665 /* Since all sections, except for backend specific ones,
13666 have been garbage collected, call mark_hook on this
13667 section if any of its linked-to sections is marked. */
13668 asection
*linked_to_sec
;
13669 for (linked_to_sec
= elf_linked_to_section (isec
);
13670 linked_to_sec
!= NULL
&& !linked_to_sec
->linker_mark
;
13671 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13673 if (linked_to_sec
->gc_mark
)
13675 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13679 linked_to_sec
->linker_mark
= 1;
13681 for (linked_to_sec
= elf_linked_to_section (isec
);
13682 linked_to_sec
!= NULL
&& linked_to_sec
->linker_mark
;
13683 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13684 linked_to_sec
->linker_mark
= 0;
13687 if (!debug_frag_seen
13688 && (isec
->flags
& SEC_DEBUGGING
)
13689 && startswith (isec
->name
, ".debug_line."))
13690 debug_frag_seen
= true;
13691 else if (strcmp (bfd_section_name (isec
),
13692 "__patchable_function_entries") == 0
13693 && elf_linked_to_section (isec
) == NULL
)
13694 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13695 "need linked-to section "
13696 "for --gc-sections\n"),
13697 isec
->owner
, isec
);
13700 /* If no non-note alloc section in this file will be kept, then
13701 we can toss out the debug and special sections. */
13705 /* Keep debug and special sections like .comment when they are
13706 not part of a group. Also keep section groups that contain
13707 just debug sections or special sections. NB: Sections with
13708 linked-to section has been handled above. */
13709 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13711 if ((isec
->flags
& SEC_GROUP
) != 0)
13712 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13713 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13714 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13715 && elf_next_in_group (isec
) == NULL
13716 && elf_linked_to_section (isec
) == NULL
)
13718 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13719 has_kept_debug_info
= true;
13722 /* Look for CODE sections which are going to be discarded,
13723 and find and discard any fragmented debug sections which
13724 are associated with that code section. */
13725 if (debug_frag_seen
)
13726 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13727 if ((isec
->flags
& SEC_CODE
) != 0
13728 && isec
->gc_mark
== 0)
13733 ilen
= strlen (isec
->name
);
13735 /* Association is determined by the name of the debug
13736 section containing the name of the code section as
13737 a suffix. For example .debug_line.text.foo is a
13738 debug section associated with .text.foo. */
13739 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13743 if (dsec
->gc_mark
== 0
13744 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13747 dlen
= strlen (dsec
->name
);
13750 && strncmp (dsec
->name
+ (dlen
- ilen
),
13751 isec
->name
, ilen
) == 0)
13756 /* Mark debug sections referenced by kept debug sections. */
13757 if (has_kept_debug_info
)
13758 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13760 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13761 if (!_bfd_elf_gc_mark (info
, isec
,
13762 elf_gc_mark_debug_section
))
13769 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13772 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13774 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13778 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13779 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13780 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13783 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13786 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13788 /* When any section in a section group is kept, we keep all
13789 sections in the section group. If the first member of
13790 the section group is excluded, we will also exclude the
13792 if (o
->flags
& SEC_GROUP
)
13794 asection
*first
= elf_next_in_group (o
);
13795 o
->gc_mark
= first
->gc_mark
;
13801 /* Skip sweeping sections already excluded. */
13802 if (o
->flags
& SEC_EXCLUDE
)
13805 /* Since this is early in the link process, it is simple
13806 to remove a section from the output. */
13807 o
->flags
|= SEC_EXCLUDE
;
13809 if (info
->print_gc_sections
&& o
->size
!= 0)
13810 /* xgettext:c-format */
13811 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13819 /* Propagate collected vtable information. This is called through
13820 elf_link_hash_traverse. */
13823 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13825 /* Those that are not vtables. */
13827 || h
->u2
.vtable
== NULL
13828 || h
->u2
.vtable
->parent
== NULL
)
13831 /* Those vtables that do not have parents, we cannot merge. */
13832 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13835 /* If we've already been done, exit. */
13836 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13839 /* Make sure the parent's table is up to date. */
13840 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13842 if (h
->u2
.vtable
->used
== NULL
)
13844 /* None of this table's entries were referenced. Re-use the
13846 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13847 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13854 /* Or the parent's entries into ours. */
13855 cu
= h
->u2
.vtable
->used
;
13857 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13860 const struct elf_backend_data
*bed
;
13861 unsigned int log_file_align
;
13863 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13864 log_file_align
= bed
->s
->log_file_align
;
13865 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13880 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13883 bfd_vma hstart
, hend
;
13884 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13885 const struct elf_backend_data
*bed
;
13886 unsigned int log_file_align
;
13888 /* Take care of both those symbols that do not describe vtables as
13889 well as those that are not loaded. */
13891 || h
->u2
.vtable
== NULL
13892 || h
->u2
.vtable
->parent
== NULL
)
13895 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13896 || h
->root
.type
== bfd_link_hash_defweak
);
13898 sec
= h
->root
.u
.def
.section
;
13899 hstart
= h
->root
.u
.def
.value
;
13900 hend
= hstart
+ h
->size
;
13902 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, true);
13904 return *(bool *) okp
= false;
13905 bed
= get_elf_backend_data (sec
->owner
);
13906 log_file_align
= bed
->s
->log_file_align
;
13908 relend
= relstart
+ sec
->reloc_count
;
13910 for (rel
= relstart
; rel
< relend
; ++rel
)
13911 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13913 /* If the entry is in use, do nothing. */
13914 if (h
->u2
.vtable
->used
13915 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13917 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13918 if (h
->u2
.vtable
->used
[entry
])
13921 /* Otherwise, kill it. */
13922 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13928 /* Mark sections containing dynamically referenced symbols. When
13929 building shared libraries, we must assume that any visible symbol is
13933 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13935 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13936 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13938 if ((h
->root
.type
== bfd_link_hash_defined
13939 || h
->root
.type
== bfd_link_hash_defweak
)
13941 || h
->root
.ldscript_def
13942 || !info
->start_stop_gc
)
13943 && ((h
->ref_dynamic
&& !h
->forced_local
)
13944 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13945 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13946 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13947 && (!bfd_link_executable (info
)
13948 || info
->gc_keep_exported
13949 || info
->export_dynamic
13952 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13953 && (h
->versioned
>= versioned
13954 || !bfd_hide_sym_by_version (info
->version_info
,
13955 h
->root
.root
.string
)))))
13956 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13961 /* Keep all sections containing symbols undefined on the command-line,
13962 and the section containing the entry symbol. */
13965 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13967 struct bfd_sym_chain
*sym
;
13969 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13971 struct elf_link_hash_entry
*h
;
13973 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13974 false, false, false);
13977 && (h
->root
.type
== bfd_link_hash_defined
13978 || h
->root
.type
== bfd_link_hash_defweak
)
13979 && !bfd_is_const_section (h
->root
.u
.def
.section
))
13980 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13985 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13986 struct bfd_link_info
*info
)
13988 bfd
*ibfd
= info
->input_bfds
;
13990 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13993 struct elf_reloc_cookie cookie
;
13995 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13997 sec
= ibfd
->sections
;
13998 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14001 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
14004 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
14006 if (startswith (bfd_section_name (sec
), ".eh_frame_entry")
14007 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
14009 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
14010 fini_reloc_cookie_rels (&cookie
, sec
);
14017 /* Do mark and sweep of unused sections. */
14020 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
14024 elf_gc_mark_hook_fn gc_mark_hook
;
14025 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14026 struct elf_link_hash_table
*htab
;
14028 if (!bed
->can_gc_sections
14029 || !is_elf_hash_table (info
->hash
))
14031 _bfd_error_handler(_("warning: gc-sections option ignored"));
14035 bed
->gc_keep (info
);
14036 htab
= elf_hash_table (info
);
14038 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
14039 at the .eh_frame section if we can mark the FDEs individually. */
14040 for (sub
= info
->input_bfds
;
14041 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
14042 sub
= sub
->link
.next
)
14045 struct elf_reloc_cookie cookie
;
14047 sec
= sub
->sections
;
14048 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14050 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
14051 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
14053 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
14054 if (elf_section_data (sec
)->sec_info
14055 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
14056 elf_eh_frame_section (sub
) = sec
;
14057 fini_reloc_cookie_for_section (&cookie
, sec
);
14058 sec
= bfd_get_next_section_by_name (NULL
, sec
);
14062 /* Apply transitive closure to the vtable entry usage info. */
14063 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
14067 /* Kill the vtable relocations that were not used. */
14068 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
14072 /* Mark dynamically referenced symbols. */
14073 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
14074 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
14076 /* Grovel through relocs to find out who stays ... */
14077 gc_mark_hook
= bed
->gc_mark_hook
;
14078 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14082 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14083 || elf_object_id (sub
) != elf_hash_table_id (htab
)
14084 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14088 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14091 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
14092 Also treat note sections as a root, if the section is not part
14093 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
14094 well as FINI_ARRAY sections for ld -r. */
14095 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14097 && (o
->flags
& SEC_EXCLUDE
) == 0
14098 && ((o
->flags
& SEC_KEEP
) != 0
14099 || (bfd_link_relocatable (info
)
14100 && ((elf_section_data (o
)->this_hdr
.sh_type
14101 == SHT_PREINIT_ARRAY
)
14102 || (elf_section_data (o
)->this_hdr
.sh_type
14104 || (elf_section_data (o
)->this_hdr
.sh_type
14105 == SHT_FINI_ARRAY
)))
14106 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
14107 && elf_next_in_group (o
) == NULL
14108 && elf_linked_to_section (o
) == NULL
)
14109 || ((elf_tdata (sub
)->has_gnu_osabi
& elf_gnu_osabi_retain
)
14110 && (elf_section_flags (o
) & SHF_GNU_RETAIN
))))
14112 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
14117 /* Allow the backend to mark additional target specific sections. */
14118 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
14120 /* ... and mark SEC_EXCLUDE for those that go. */
14121 return elf_gc_sweep (abfd
, info
);
14124 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
14127 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
14129 struct elf_link_hash_entry
*h
,
14132 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
14133 struct elf_link_hash_entry
**search
, *child
;
14134 size_t extsymcount
;
14135 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14137 /* The sh_info field of the symtab header tells us where the
14138 external symbols start. We don't care about the local symbols at
14140 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
14141 if (!elf_bad_symtab (abfd
))
14142 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
14144 sym_hashes
= elf_sym_hashes (abfd
);
14145 sym_hashes_end
= sym_hashes
+ extsymcount
;
14147 /* Hunt down the child symbol, which is in this section at the same
14148 offset as the relocation. */
14149 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
14151 if ((child
= *search
) != NULL
14152 && (child
->root
.type
== bfd_link_hash_defined
14153 || child
->root
.type
== bfd_link_hash_defweak
)
14154 && child
->root
.u
.def
.section
== sec
14155 && child
->root
.u
.def
.value
== offset
)
14159 /* xgettext:c-format */
14160 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
14161 abfd
, sec
, (uint64_t) offset
);
14162 bfd_set_error (bfd_error_invalid_operation
);
14166 if (!child
->u2
.vtable
)
14168 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14169 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
14170 if (!child
->u2
.vtable
)
14175 /* This *should* only be the absolute section. It could potentially
14176 be that someone has defined a non-global vtable though, which
14177 would be bad. It isn't worth paging in the local symbols to be
14178 sure though; that case should simply be handled by the assembler. */
14180 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
14183 child
->u2
.vtable
->parent
= h
;
14188 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
14191 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
14192 struct elf_link_hash_entry
*h
,
14195 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14196 unsigned int log_file_align
= bed
->s
->log_file_align
;
14200 /* xgettext:c-format */
14201 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
14203 bfd_set_error (bfd_error_bad_value
);
14209 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14210 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14215 if (addend
>= h
->u2
.vtable
->size
)
14217 size_t size
, bytes
, file_align
;
14218 bool *ptr
= h
->u2
.vtable
->used
;
14220 /* While the symbol is undefined, we have to be prepared to handle
14222 file_align
= 1 << log_file_align
;
14223 if (h
->root
.type
== bfd_link_hash_undefined
)
14224 size
= addend
+ file_align
;
14228 if (addend
>= size
)
14230 /* Oops! We've got a reference past the defined end of
14231 the table. This is probably a bug -- shall we warn? */
14232 size
= addend
+ file_align
;
14235 size
= (size
+ file_align
- 1) & -file_align
;
14237 /* Allocate one extra entry for use as a "done" flag for the
14238 consolidation pass. */
14239 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bool);
14243 ptr
= (bool *) bfd_realloc (ptr
- 1, bytes
);
14249 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14251 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14255 ptr
= (bool *) bfd_zmalloc (bytes
);
14260 /* And arrange for that done flag to be at index -1. */
14261 h
->u2
.vtable
->used
= ptr
+ 1;
14262 h
->u2
.vtable
->size
= size
;
14265 h
->u2
.vtable
->used
[addend
>> log_file_align
] = true;
14270 /* Map an ELF section header flag to its corresponding string. */
14274 flagword flag_value
;
14275 } elf_flags_to_name_table
;
14277 static const elf_flags_to_name_table elf_flags_to_names
[] =
14279 { "SHF_WRITE", SHF_WRITE
},
14280 { "SHF_ALLOC", SHF_ALLOC
},
14281 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14282 { "SHF_MERGE", SHF_MERGE
},
14283 { "SHF_STRINGS", SHF_STRINGS
},
14284 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14285 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14286 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14287 { "SHF_GROUP", SHF_GROUP
},
14288 { "SHF_TLS", SHF_TLS
},
14289 { "SHF_MASKOS", SHF_MASKOS
},
14290 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14293 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14295 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14296 struct flag_info
*flaginfo
,
14299 const bfd_vma sh_flags
= elf_section_flags (section
);
14301 if (!flaginfo
->flags_initialized
)
14303 bfd
*obfd
= info
->output_bfd
;
14304 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14305 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14307 int without_hex
= 0;
14309 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14312 flagword (*lookup
) (char *);
14314 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14315 if (lookup
!= NULL
)
14317 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14321 if (tf
->with
== with_flags
)
14322 with_hex
|= hexval
;
14323 else if (tf
->with
== without_flags
)
14324 without_hex
|= hexval
;
14329 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14331 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14333 if (tf
->with
== with_flags
)
14334 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14335 else if (tf
->with
== without_flags
)
14336 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14343 info
->callbacks
->einfo
14344 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14348 flaginfo
->flags_initialized
= true;
14349 flaginfo
->only_with_flags
|= with_hex
;
14350 flaginfo
->not_with_flags
|= without_hex
;
14353 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14356 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14362 struct alloc_got_off_arg
{
14364 struct bfd_link_info
*info
;
14367 /* We need a special top-level link routine to convert got reference counts
14368 to real got offsets. */
14371 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14373 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14374 bfd
*obfd
= gofarg
->info
->output_bfd
;
14375 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14377 if (h
->got
.refcount
> 0)
14379 h
->got
.offset
= gofarg
->gotoff
;
14380 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14383 h
->got
.offset
= (bfd_vma
) -1;
14388 /* And an accompanying bit to work out final got entry offsets once
14389 we're done. Should be called from final_link. */
14392 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14393 struct bfd_link_info
*info
)
14396 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14398 struct alloc_got_off_arg gofarg
;
14400 BFD_ASSERT (abfd
== info
->output_bfd
);
14402 if (! is_elf_hash_table (info
->hash
))
14405 /* The GOT offset is relative to the .got section, but the GOT header is
14406 put into the .got.plt section, if the backend uses it. */
14407 if (bed
->want_got_plt
)
14410 gotoff
= bed
->got_header_size
;
14412 /* Do the local .got entries first. */
14413 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14415 bfd_signed_vma
*local_got
;
14416 size_t j
, locsymcount
;
14417 Elf_Internal_Shdr
*symtab_hdr
;
14419 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14422 local_got
= elf_local_got_refcounts (i
);
14426 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14427 if (elf_bad_symtab (i
))
14428 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14430 locsymcount
= symtab_hdr
->sh_info
;
14432 for (j
= 0; j
< locsymcount
; ++j
)
14434 if (local_got
[j
] > 0)
14436 local_got
[j
] = gotoff
;
14437 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14440 local_got
[j
] = (bfd_vma
) -1;
14444 /* Then the global .got entries. .plt refcounts are handled by
14445 adjust_dynamic_symbol */
14446 gofarg
.gotoff
= gotoff
;
14447 gofarg
.info
= info
;
14448 elf_link_hash_traverse (elf_hash_table (info
),
14449 elf_gc_allocate_got_offsets
,
14454 /* Many folk need no more in the way of final link than this, once
14455 got entry reference counting is enabled. */
14458 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14460 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14463 /* Invoke the regular ELF backend linker to do all the work. */
14464 return bfd_elf_final_link (abfd
, info
);
14468 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14470 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14472 if (rcookie
->bad_symtab
)
14473 rcookie
->rel
= rcookie
->rels
;
14475 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14477 unsigned long r_symndx
;
14479 if (! rcookie
->bad_symtab
)
14480 if (rcookie
->rel
->r_offset
> offset
)
14482 if (rcookie
->rel
->r_offset
!= offset
)
14485 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14486 if (r_symndx
== STN_UNDEF
)
14489 if (r_symndx
>= rcookie
->locsymcount
14490 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14492 struct elf_link_hash_entry
*h
;
14494 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14496 while (h
->root
.type
== bfd_link_hash_indirect
14497 || h
->root
.type
== bfd_link_hash_warning
)
14498 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14500 if ((h
->root
.type
== bfd_link_hash_defined
14501 || h
->root
.type
== bfd_link_hash_defweak
)
14502 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14503 || h
->root
.u
.def
.section
->kept_section
!= NULL
14504 || discarded_section (h
->root
.u
.def
.section
)))
14509 /* It's not a relocation against a global symbol,
14510 but it could be a relocation against a local
14511 symbol for a discarded section. */
14513 Elf_Internal_Sym
*isym
;
14515 /* Need to: get the symbol; get the section. */
14516 isym
= &rcookie
->locsyms
[r_symndx
];
14517 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14519 && (isec
->kept_section
!= NULL
14520 || discarded_section (isec
)))
14528 /* Discard unneeded references to discarded sections.
14529 Returns -1 on error, 1 if any section's size was changed, 0 if
14530 nothing changed. This function assumes that the relocations are in
14531 sorted order, which is true for all known assemblers. */
14534 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14536 struct elf_reloc_cookie cookie
;
14541 if (info
->traditional_format
14542 || !is_elf_hash_table (info
->hash
))
14545 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14550 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14553 || i
->reloc_count
== 0
14554 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14558 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14561 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14564 if (_bfd_discard_section_stabs (abfd
, i
,
14565 elf_section_data (i
)->sec_info
,
14566 bfd_elf_reloc_symbol_deleted_p
,
14570 fini_reloc_cookie_for_section (&cookie
, i
);
14575 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14576 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14580 int eh_changed
= 0;
14581 unsigned int eh_alignment
; /* Octets. */
14583 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14589 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14592 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14595 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14596 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14597 bfd_elf_reloc_symbol_deleted_p
,
14601 if (i
->size
!= i
->rawsize
)
14605 fini_reloc_cookie_for_section (&cookie
, i
);
14608 eh_alignment
= ((1 << o
->alignment_power
)
14609 * bfd_octets_per_byte (output_bfd
, o
));
14610 /* Skip over zero terminator, and prevent empty sections from
14611 adding alignment padding at the end. */
14612 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14614 i
->flags
|= SEC_EXCLUDE
;
14615 else if (i
->size
> 4)
14617 /* The last non-empty eh_frame section doesn't need padding. */
14620 /* Any prior sections must pad the last FDE out to the output
14621 section alignment. Otherwise we might have zero padding
14622 between sections, which would be seen as a terminator. */
14623 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14625 /* All but the last zero terminator should have been removed. */
14630 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14631 if (i
->size
!= size
)
14639 elf_link_hash_traverse (elf_hash_table (info
),
14640 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14643 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14645 const struct elf_backend_data
*bed
;
14648 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14650 s
= abfd
->sections
;
14651 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14654 bed
= get_elf_backend_data (abfd
);
14656 if (bed
->elf_backend_discard_info
!= NULL
)
14658 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14661 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14664 fini_reloc_cookie (&cookie
, abfd
);
14668 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14669 _bfd_elf_end_eh_frame_parsing (info
);
14671 if (info
->eh_frame_hdr_type
14672 && !bfd_link_relocatable (info
)
14673 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14680 _bfd_elf_section_already_linked (bfd
*abfd
,
14682 struct bfd_link_info
*info
)
14685 const char *name
, *key
;
14686 struct bfd_section_already_linked
*l
;
14687 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14689 if (sec
->output_section
== bfd_abs_section_ptr
)
14692 flags
= sec
->flags
;
14694 /* Return if it isn't a linkonce section. A comdat group section
14695 also has SEC_LINK_ONCE set. */
14696 if ((flags
& SEC_LINK_ONCE
) == 0)
14699 /* Don't put group member sections on our list of already linked
14700 sections. They are handled as a group via their group section. */
14701 if (elf_sec_group (sec
) != NULL
)
14704 /* For a SHT_GROUP section, use the group signature as the key. */
14706 if ((flags
& SEC_GROUP
) != 0
14707 && elf_next_in_group (sec
) != NULL
14708 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14709 key
= elf_group_name (elf_next_in_group (sec
));
14712 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14713 if (startswith (name
, ".gnu.linkonce.")
14714 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14717 /* Must be a user linkonce section that doesn't follow gcc's
14718 naming convention. In this case we won't be matching
14719 single member groups. */
14723 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14725 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14727 /* We may have 2 different types of sections on the list: group
14728 sections with a signature of <key> (<key> is some string),
14729 and linkonce sections named .gnu.linkonce.<type>.<key>.
14730 Match like sections. LTO plugin sections are an exception.
14731 They are always named .gnu.linkonce.t.<key> and match either
14732 type of section. */
14733 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14734 && ((flags
& SEC_GROUP
) != 0
14735 || strcmp (name
, l
->sec
->name
) == 0))
14736 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0
14737 || (sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14739 /* The section has already been linked. See if we should
14740 issue a warning. */
14741 if (!_bfd_handle_already_linked (sec
, l
, info
))
14744 if (flags
& SEC_GROUP
)
14746 asection
*first
= elf_next_in_group (sec
);
14747 asection
*s
= first
;
14751 s
->output_section
= bfd_abs_section_ptr
;
14752 /* Record which group discards it. */
14753 s
->kept_section
= l
->sec
;
14754 s
= elf_next_in_group (s
);
14755 /* These lists are circular. */
14765 /* A single member comdat group section may be discarded by a
14766 linkonce section and vice versa. */
14767 if ((flags
& SEC_GROUP
) != 0)
14769 asection
*first
= elf_next_in_group (sec
);
14771 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14772 /* Check this single member group against linkonce sections. */
14773 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14774 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14775 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14777 first
->output_section
= bfd_abs_section_ptr
;
14778 first
->kept_section
= l
->sec
;
14779 sec
->output_section
= bfd_abs_section_ptr
;
14784 /* Check this linkonce section against single member groups. */
14785 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14786 if (l
->sec
->flags
& SEC_GROUP
)
14788 asection
*first
= elf_next_in_group (l
->sec
);
14791 && elf_next_in_group (first
) == first
14792 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14794 sec
->output_section
= bfd_abs_section_ptr
;
14795 sec
->kept_section
= first
;
14800 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14801 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14802 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14803 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14804 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14805 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14806 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14807 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14808 The reverse order cannot happen as there is never a bfd with only the
14809 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14810 matter as here were are looking only for cross-bfd sections. */
14812 if ((flags
& SEC_GROUP
) == 0 && startswith (name
, ".gnu.linkonce.r."))
14813 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14814 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14815 && startswith (l
->sec
->name
, ".gnu.linkonce.t."))
14817 if (abfd
!= l
->sec
->owner
)
14818 sec
->output_section
= bfd_abs_section_ptr
;
14822 /* This is the first section with this name. Record it. */
14823 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14824 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14825 return sec
->output_section
== bfd_abs_section_ptr
;
14829 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14831 return sym
->st_shndx
== SHN_COMMON
;
14835 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14841 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14843 return bfd_com_section_ptr
;
14847 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14848 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14849 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14850 bfd
*ibfd ATTRIBUTE_UNUSED
,
14851 unsigned long symndx ATTRIBUTE_UNUSED
)
14853 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14854 return bed
->s
->arch_size
/ 8;
14857 /* Routines to support the creation of dynamic relocs. */
14859 /* Returns the name of the dynamic reloc section associated with SEC. */
14861 static const char *
14862 get_dynamic_reloc_section_name (bfd
* abfd
,
14867 const char *old_name
= bfd_section_name (sec
);
14868 const char *prefix
= is_rela
? ".rela" : ".rel";
14870 if (old_name
== NULL
)
14873 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14874 sprintf (name
, "%s%s", prefix
, old_name
);
14879 /* Returns the dynamic reloc section associated with SEC.
14880 If necessary compute the name of the dynamic reloc section based
14881 on SEC's name (looked up in ABFD's string table) and the setting
14885 _bfd_elf_get_dynamic_reloc_section (bfd
*abfd
,
14889 asection
*reloc_sec
= elf_section_data (sec
)->sreloc
;
14891 if (reloc_sec
== NULL
)
14893 const char *name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14897 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14899 if (reloc_sec
!= NULL
)
14900 elf_section_data (sec
)->sreloc
= reloc_sec
;
14907 /* Returns the dynamic reloc section associated with SEC. If the
14908 section does not exist it is created and attached to the DYNOBJ
14909 bfd and stored in the SRELOC field of SEC's elf_section_data
14912 ALIGNMENT is the alignment for the newly created section and
14913 IS_RELA defines whether the name should be .rela.<SEC's name>
14914 or .rel.<SEC's name>. The section name is looked up in the
14915 string table associated with ABFD. */
14918 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14920 unsigned int alignment
,
14924 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14926 if (reloc_sec
== NULL
)
14928 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14933 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14935 if (reloc_sec
== NULL
)
14937 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14938 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14939 if ((sec
->flags
& SEC_ALLOC
) != 0)
14940 flags
|= SEC_ALLOC
| SEC_LOAD
;
14942 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14943 if (reloc_sec
!= NULL
)
14945 /* _bfd_elf_get_sec_type_attr chooses a section type by
14946 name. Override as it may be wrong, eg. for a user
14947 section named "auto" we'll get ".relauto" which is
14948 seen to be a .rela section. */
14949 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14950 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14955 elf_section_data (sec
)->sreloc
= reloc_sec
;
14961 /* Copy the ELF symbol type and other attributes for a linker script
14962 assignment from HSRC to HDEST. Generally this should be treated as
14963 if we found a strong non-dynamic definition for HDEST (except that
14964 ld ignores multiple definition errors). */
14966 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14967 struct bfd_link_hash_entry
*hdest
,
14968 struct bfd_link_hash_entry
*hsrc
)
14970 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14971 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14972 Elf_Internal_Sym isym
;
14974 ehdest
->type
= ehsrc
->type
;
14975 ehdest
->target_internal
= ehsrc
->target_internal
;
14977 isym
.st_other
= ehsrc
->other
;
14978 elf_merge_st_other (abfd
, ehdest
, isym
.st_other
, NULL
, true, false);
14981 /* Append a RELA relocation REL to section S in BFD. */
14984 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14986 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14987 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14988 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14989 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14992 /* Append a REL relocation REL to section S in BFD. */
14995 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14997 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14998 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14999 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
15000 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
15003 /* Define __start, __stop, .startof. or .sizeof. symbol. */
15005 struct bfd_link_hash_entry
*
15006 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
15007 const char *symbol
, asection
*sec
)
15009 struct elf_link_hash_entry
*h
;
15011 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
15012 false, false, true);
15013 /* NB: Common symbols will be turned into definition later. */
15015 && !h
->root
.ldscript_def
15016 && (h
->root
.type
== bfd_link_hash_undefined
15017 || h
->root
.type
== bfd_link_hash_undefweak
15018 || ((h
->ref_regular
|| h
->def_dynamic
)
15020 && h
->root
.type
!= bfd_link_hash_common
)))
15022 bool was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
15023 h
->verinfo
.verdef
= NULL
;
15024 h
->root
.type
= bfd_link_hash_defined
;
15025 h
->root
.u
.def
.section
= sec
;
15026 h
->root
.u
.def
.value
= 0;
15027 h
->def_regular
= 1;
15028 h
->def_dynamic
= 0;
15030 h
->u2
.start_stop_section
= sec
;
15031 if (symbol
[0] == '.')
15033 /* .startof. and .sizeof. symbols are local. */
15034 const struct elf_backend_data
*bed
;
15035 bed
= get_elf_backend_data (info
->output_bfd
);
15036 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
15040 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
15041 h
->other
= ((h
->other
& ~ELF_ST_VISIBILITY (-1))
15042 | info
->start_stop_visibility
);
15044 bfd_elf_link_record_dynamic_symbol (info
, h
);
15051 /* Find dynamic relocs for H that apply to read-only sections. */
15054 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
15056 struct elf_dyn_relocs
*p
;
15058 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
15060 asection
*s
= p
->sec
->output_section
;
15062 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
15068 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
15069 read-only sections. */
15072 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
15076 if (h
->root
.type
== bfd_link_hash_indirect
)
15079 sec
= _bfd_elf_readonly_dynrelocs (h
);
15082 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
15084 info
->flags
|= DF_TEXTREL
;
15085 /* xgettext:c-format */
15086 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
15087 "in read-only section `%pA'\n"),
15088 sec
->owner
, h
->root
.root
.string
, sec
);
15090 if (bfd_link_textrel_check (info
))
15091 /* xgettext:c-format */
15092 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
15093 "in read-only section `%pA'\n"),
15094 sec
->owner
, h
->root
.root
.string
, sec
);
15096 /* Not an error, just cut short the traversal. */
15102 /* Add dynamic tags. */
15105 _bfd_elf_add_dynamic_tags (bfd
*output_bfd
, struct bfd_link_info
*info
,
15106 bool need_dynamic_reloc
)
15108 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
15110 if (htab
->dynamic_sections_created
)
15112 /* Add some entries to the .dynamic section. We fill in the
15113 values later, in finish_dynamic_sections, but we must add
15114 the entries now so that we get the correct size for the
15115 .dynamic section. The DT_DEBUG entry is filled in by the
15116 dynamic linker and used by the debugger. */
15117 #define add_dynamic_entry(TAG, VAL) \
15118 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
15120 const struct elf_backend_data
*bed
15121 = get_elf_backend_data (output_bfd
);
15123 if (bfd_link_executable (info
))
15125 if (!add_dynamic_entry (DT_DEBUG
, 0))
15129 if (htab
->dt_pltgot_required
|| htab
->splt
->size
!= 0)
15131 /* DT_PLTGOT is used by prelink even if there is no PLT
15133 if (!add_dynamic_entry (DT_PLTGOT
, 0))
15137 if (htab
->dt_jmprel_required
|| htab
->srelplt
->size
!= 0)
15139 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
15140 || !add_dynamic_entry (DT_PLTREL
,
15141 (bed
->rela_plts_and_copies_p
15142 ? DT_RELA
: DT_REL
))
15143 || !add_dynamic_entry (DT_JMPREL
, 0))
15147 if (htab
->tlsdesc_plt
15148 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
15149 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
15152 if (need_dynamic_reloc
)
15154 if (bed
->rela_plts_and_copies_p
)
15156 if (!add_dynamic_entry (DT_RELA
, 0)
15157 || !add_dynamic_entry (DT_RELASZ
, 0)
15158 || !add_dynamic_entry (DT_RELAENT
,
15159 bed
->s
->sizeof_rela
))
15164 if (!add_dynamic_entry (DT_REL
, 0)
15165 || !add_dynamic_entry (DT_RELSZ
, 0)
15166 || !add_dynamic_entry (DT_RELENT
,
15167 bed
->s
->sizeof_rel
))
15171 /* If any dynamic relocs apply to a read-only section,
15172 then we need a DT_TEXTREL entry. */
15173 if ((info
->flags
& DF_TEXTREL
) == 0)
15174 elf_link_hash_traverse (htab
, _bfd_elf_maybe_set_textrel
,
15177 if ((info
->flags
& DF_TEXTREL
) != 0)
15179 if (htab
->ifunc_resolvers
)
15180 info
->callbacks
->einfo
15181 (_("%P: warning: GNU indirect functions with DT_TEXTREL "
15182 "may result in a segfault at runtime; recompile with %s\n"),
15183 bfd_link_dll (info
) ? "-fPIC" : "-fPIE");
15185 if (!add_dynamic_entry (DT_TEXTREL
, 0))
15190 #undef add_dynamic_entry