1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info
*info
;
39 struct bfd_elf_version_tree
*verdefs
;
43 /* This structure is used to pass information to
44 _bfd_elf_link_find_version_dependencies. */
46 struct elf_find_verdep_info
48 /* General link information. */
49 struct bfd_link_info
*info
;
50 /* The number of dependencies. */
52 /* Whether we had a failure. */
56 static bfd_boolean _bfd_elf_fix_symbol_flags
57 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
59 /* Define a symbol in a dynamic linkage section. */
61 struct elf_link_hash_entry
*
62 _bfd_elf_define_linkage_sym (bfd
*abfd
,
63 struct bfd_link_info
*info
,
67 struct elf_link_hash_entry
*h
;
68 struct bfd_link_hash_entry
*bh
;
69 const struct elf_backend_data
*bed
;
71 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
74 /* Zap symbol defined in an as-needed lib that wasn't linked.
75 This is a symptom of a larger problem: Absolute symbols
76 defined in shared libraries can't be overridden, because we
77 lose the link to the bfd which is via the symbol section. */
78 h
->root
.type
= bfd_link_hash_new
;
82 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
84 get_elf_backend_data (abfd
)->collect
,
87 h
= (struct elf_link_hash_entry
*) bh
;
91 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
93 bed
= get_elf_backend_data (abfd
);
94 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
99 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
103 struct elf_link_hash_entry
*h
;
104 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
105 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
107 /* This function may be called more than once. */
108 s
= bfd_get_section_by_name (abfd
, ".got");
109 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
112 flags
= bed
->dynamic_sec_flags
;
114 s
= bfd_make_section_with_flags (abfd
,
115 (bed
->rela_plts_and_copies_p
116 ? ".rela.got" : ".rel.got"),
117 (bed
->dynamic_sec_flags
120 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
124 s
= bfd_make_section_with_flags (abfd
, ".got", flags
);
126 || !bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
130 if (bed
->want_got_plt
)
132 s
= bfd_make_section_with_flags (abfd
, ".got.plt", flags
);
134 || !bfd_set_section_alignment (abfd
, s
,
135 bed
->s
->log_file_align
))
140 /* The first bit of the global offset table is the header. */
141 s
->size
+= bed
->got_header_size
;
143 if (bed
->want_got_sym
)
145 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
146 (or .got.plt) section. We don't do this in the linker script
147 because we don't want to define the symbol if we are not creating
148 a global offset table. */
149 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
150 "_GLOBAL_OFFSET_TABLE_");
151 elf_hash_table (info
)->hgot
= h
;
159 /* Create a strtab to hold the dynamic symbol names. */
161 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
163 struct elf_link_hash_table
*hash_table
;
165 hash_table
= elf_hash_table (info
);
166 if (hash_table
->dynobj
== NULL
)
167 hash_table
->dynobj
= abfd
;
169 if (hash_table
->dynstr
== NULL
)
171 hash_table
->dynstr
= _bfd_elf_strtab_init ();
172 if (hash_table
->dynstr
== NULL
)
178 /* Create some sections which will be filled in with dynamic linking
179 information. ABFD is an input file which requires dynamic sections
180 to be created. The dynamic sections take up virtual memory space
181 when the final executable is run, so we need to create them before
182 addresses are assigned to the output sections. We work out the
183 actual contents and size of these sections later. */
186 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
190 const struct elf_backend_data
*bed
;
192 if (! is_elf_hash_table (info
->hash
))
195 if (elf_hash_table (info
)->dynamic_sections_created
)
198 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
201 abfd
= elf_hash_table (info
)->dynobj
;
202 bed
= get_elf_backend_data (abfd
);
204 flags
= bed
->dynamic_sec_flags
;
206 /* A dynamically linked executable has a .interp section, but a
207 shared library does not. */
208 if (info
->executable
)
210 s
= bfd_make_section_with_flags (abfd
, ".interp",
211 flags
| SEC_READONLY
);
216 /* Create sections to hold version informations. These are removed
217 if they are not needed. */
218 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_d",
219 flags
| SEC_READONLY
);
221 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
224 s
= bfd_make_section_with_flags (abfd
, ".gnu.version",
225 flags
| SEC_READONLY
);
227 || ! bfd_set_section_alignment (abfd
, s
, 1))
230 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_r",
231 flags
| SEC_READONLY
);
233 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
236 s
= bfd_make_section_with_flags (abfd
, ".dynsym",
237 flags
| SEC_READONLY
);
239 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
242 s
= bfd_make_section_with_flags (abfd
, ".dynstr",
243 flags
| SEC_READONLY
);
247 s
= bfd_make_section_with_flags (abfd
, ".dynamic", flags
);
249 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
252 /* The special symbol _DYNAMIC is always set to the start of the
253 .dynamic section. We could set _DYNAMIC in a linker script, but we
254 only want to define it if we are, in fact, creating a .dynamic
255 section. We don't want to define it if there is no .dynamic
256 section, since on some ELF platforms the start up code examines it
257 to decide how to initialize the process. */
258 if (!_bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC"))
263 s
= bfd_make_section_with_flags (abfd
, ".hash", flags
| SEC_READONLY
);
265 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
267 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
270 if (info
->emit_gnu_hash
)
272 s
= bfd_make_section_with_flags (abfd
, ".gnu.hash",
273 flags
| SEC_READONLY
);
275 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
277 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
278 4 32-bit words followed by variable count of 64-bit words, then
279 variable count of 32-bit words. */
280 if (bed
->s
->arch_size
== 64)
281 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
283 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
286 /* Let the backend create the rest of the sections. This lets the
287 backend set the right flags. The backend will normally create
288 the .got and .plt sections. */
289 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
292 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
297 /* Create dynamic sections when linking against a dynamic object. */
300 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
302 flagword flags
, pltflags
;
303 struct elf_link_hash_entry
*h
;
305 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
306 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
308 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
309 .rel[a].bss sections. */
310 flags
= bed
->dynamic_sec_flags
;
313 if (bed
->plt_not_loaded
)
314 /* We do not clear SEC_ALLOC here because we still want the OS to
315 allocate space for the section; it's just that there's nothing
316 to read in from the object file. */
317 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
319 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
320 if (bed
->plt_readonly
)
321 pltflags
|= SEC_READONLY
;
323 s
= bfd_make_section_with_flags (abfd
, ".plt", pltflags
);
325 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
329 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
331 if (bed
->want_plt_sym
)
333 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
334 "_PROCEDURE_LINKAGE_TABLE_");
335 elf_hash_table (info
)->hplt
= h
;
340 s
= bfd_make_section_with_flags (abfd
,
341 (bed
->rela_plts_and_copies_p
342 ? ".rela.plt" : ".rel.plt"),
343 flags
| SEC_READONLY
);
345 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
349 if (! _bfd_elf_create_got_section (abfd
, info
))
352 if (bed
->want_dynbss
)
354 /* The .dynbss section is a place to put symbols which are defined
355 by dynamic objects, are referenced by regular objects, and are
356 not functions. We must allocate space for them in the process
357 image and use a R_*_COPY reloc to tell the dynamic linker to
358 initialize them at run time. The linker script puts the .dynbss
359 section into the .bss section of the final image. */
360 s
= bfd_make_section_with_flags (abfd
, ".dynbss",
362 | SEC_LINKER_CREATED
));
366 /* The .rel[a].bss section holds copy relocs. This section is not
367 normally needed. We need to create it here, though, so that the
368 linker will map it to an output section. We can't just create it
369 only if we need it, because we will not know whether we need it
370 until we have seen all the input files, and the first time the
371 main linker code calls BFD after examining all the input files
372 (size_dynamic_sections) the input sections have already been
373 mapped to the output sections. If the section turns out not to
374 be needed, we can discard it later. We will never need this
375 section when generating a shared object, since they do not use
379 s
= bfd_make_section_with_flags (abfd
,
380 (bed
->rela_plts_and_copies_p
381 ? ".rela.bss" : ".rel.bss"),
382 flags
| SEC_READONLY
);
384 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
392 /* Record a new dynamic symbol. We record the dynamic symbols as we
393 read the input files, since we need to have a list of all of them
394 before we can determine the final sizes of the output sections.
395 Note that we may actually call this function even though we are not
396 going to output any dynamic symbols; in some cases we know that a
397 symbol should be in the dynamic symbol table, but only if there is
401 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
402 struct elf_link_hash_entry
*h
)
404 if (h
->dynindx
== -1)
406 struct elf_strtab_hash
*dynstr
;
411 /* XXX: The ABI draft says the linker must turn hidden and
412 internal symbols into STB_LOCAL symbols when producing the
413 DSO. However, if ld.so honors st_other in the dynamic table,
414 this would not be necessary. */
415 switch (ELF_ST_VISIBILITY (h
->other
))
419 if (h
->root
.type
!= bfd_link_hash_undefined
420 && h
->root
.type
!= bfd_link_hash_undefweak
)
423 if (!elf_hash_table (info
)->is_relocatable_executable
)
431 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
432 ++elf_hash_table (info
)->dynsymcount
;
434 dynstr
= elf_hash_table (info
)->dynstr
;
437 /* Create a strtab to hold the dynamic symbol names. */
438 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
443 /* We don't put any version information in the dynamic string
445 name
= h
->root
.root
.string
;
446 p
= strchr (name
, ELF_VER_CHR
);
448 /* We know that the p points into writable memory. In fact,
449 there are only a few symbols that have read-only names, being
450 those like _GLOBAL_OFFSET_TABLE_ that are created specially
451 by the backends. Most symbols will have names pointing into
452 an ELF string table read from a file, or to objalloc memory. */
455 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
460 if (indx
== (bfd_size_type
) -1)
462 h
->dynstr_index
= indx
;
468 /* Mark a symbol dynamic. */
471 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
472 struct elf_link_hash_entry
*h
,
473 Elf_Internal_Sym
*sym
)
475 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
477 /* It may be called more than once on the same H. */
478 if(h
->dynamic
|| info
->relocatable
)
481 if ((info
->dynamic_data
482 && (h
->type
== STT_OBJECT
484 && ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
)))
486 && h
->root
.type
== bfd_link_hash_new
487 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
491 /* Record an assignment to a symbol made by a linker script. We need
492 this in case some dynamic object refers to this symbol. */
495 bfd_elf_record_link_assignment (bfd
*output_bfd
,
496 struct bfd_link_info
*info
,
501 struct elf_link_hash_entry
*h
, *hv
;
502 struct elf_link_hash_table
*htab
;
503 const struct elf_backend_data
*bed
;
505 if (!is_elf_hash_table (info
->hash
))
508 htab
= elf_hash_table (info
);
509 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
513 switch (h
->root
.type
)
515 case bfd_link_hash_defined
:
516 case bfd_link_hash_defweak
:
517 case bfd_link_hash_common
:
519 case bfd_link_hash_undefweak
:
520 case bfd_link_hash_undefined
:
521 /* Since we're defining the symbol, don't let it seem to have not
522 been defined. record_dynamic_symbol and size_dynamic_sections
523 may depend on this. */
524 h
->root
.type
= bfd_link_hash_new
;
525 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
526 bfd_link_repair_undef_list (&htab
->root
);
528 case bfd_link_hash_new
:
529 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
532 case bfd_link_hash_indirect
:
533 /* We had a versioned symbol in a dynamic library. We make the
534 the versioned symbol point to this one. */
535 bed
= get_elf_backend_data (output_bfd
);
537 while (hv
->root
.type
== bfd_link_hash_indirect
538 || hv
->root
.type
== bfd_link_hash_warning
)
539 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
540 /* We don't need to update h->root.u since linker will set them
542 h
->root
.type
= bfd_link_hash_undefined
;
543 hv
->root
.type
= bfd_link_hash_indirect
;
544 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
545 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
547 case bfd_link_hash_warning
:
552 /* If this symbol is being provided by the linker script, and it is
553 currently defined by a dynamic object, but not by a regular
554 object, then mark it as undefined so that the generic linker will
555 force the correct value. */
559 h
->root
.type
= bfd_link_hash_undefined
;
561 /* If this symbol is not being provided by the linker script, and it is
562 currently defined by a dynamic object, but not by a regular object,
563 then clear out any version information because the symbol will not be
564 associated with the dynamic object any more. */
568 h
->verinfo
.verdef
= NULL
;
572 if (provide
&& hidden
)
574 bed
= get_elf_backend_data (output_bfd
);
575 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
576 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
579 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
581 if (!info
->relocatable
583 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
584 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
590 || (info
->executable
&& elf_hash_table (info
)->is_relocatable_executable
))
593 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
596 /* If this is a weak defined symbol, and we know a corresponding
597 real symbol from the same dynamic object, make sure the real
598 symbol is also made into a dynamic symbol. */
599 if (h
->u
.weakdef
!= NULL
600 && h
->u
.weakdef
->dynindx
== -1)
602 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
610 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
611 success, and 2 on a failure caused by attempting to record a symbol
612 in a discarded section, eg. a discarded link-once section symbol. */
615 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
620 struct elf_link_local_dynamic_entry
*entry
;
621 struct elf_link_hash_table
*eht
;
622 struct elf_strtab_hash
*dynstr
;
623 unsigned long dynstr_index
;
625 Elf_External_Sym_Shndx eshndx
;
626 char esym
[sizeof (Elf64_External_Sym
)];
628 if (! is_elf_hash_table (info
->hash
))
631 /* See if the entry exists already. */
632 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
633 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
636 amt
= sizeof (*entry
);
637 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
641 /* Go find the symbol, so that we can find it's name. */
642 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
643 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
645 bfd_release (input_bfd
, entry
);
649 if (entry
->isym
.st_shndx
!= SHN_UNDEF
650 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
654 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
655 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
657 /* We can still bfd_release here as nothing has done another
658 bfd_alloc. We can't do this later in this function. */
659 bfd_release (input_bfd
, entry
);
664 name
= (bfd_elf_string_from_elf_section
665 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
666 entry
->isym
.st_name
));
668 dynstr
= elf_hash_table (info
)->dynstr
;
671 /* Create a strtab to hold the dynamic symbol names. */
672 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
677 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
678 if (dynstr_index
== (unsigned long) -1)
680 entry
->isym
.st_name
= dynstr_index
;
682 eht
= elf_hash_table (info
);
684 entry
->next
= eht
->dynlocal
;
685 eht
->dynlocal
= entry
;
686 entry
->input_bfd
= input_bfd
;
687 entry
->input_indx
= input_indx
;
690 /* Whatever binding the symbol had before, it's now local. */
692 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
694 /* The dynindx will be set at the end of size_dynamic_sections. */
699 /* Return the dynindex of a local dynamic symbol. */
702 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
706 struct elf_link_local_dynamic_entry
*e
;
708 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
709 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
714 /* This function is used to renumber the dynamic symbols, if some of
715 them are removed because they are marked as local. This is called
716 via elf_link_hash_traverse. */
719 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
722 size_t *count
= (size_t *) data
;
724 if (h
->root
.type
== bfd_link_hash_warning
)
725 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
730 if (h
->dynindx
!= -1)
731 h
->dynindx
= ++(*count
);
737 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
738 STB_LOCAL binding. */
741 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
744 size_t *count
= (size_t *) data
;
746 if (h
->root
.type
== bfd_link_hash_warning
)
747 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
749 if (!h
->forced_local
)
752 if (h
->dynindx
!= -1)
753 h
->dynindx
= ++(*count
);
758 /* Return true if the dynamic symbol for a given section should be
759 omitted when creating a shared library. */
761 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
762 struct bfd_link_info
*info
,
765 struct elf_link_hash_table
*htab
;
767 switch (elf_section_data (p
)->this_hdr
.sh_type
)
771 /* If sh_type is yet undecided, assume it could be
772 SHT_PROGBITS/SHT_NOBITS. */
774 htab
= elf_hash_table (info
);
775 if (p
== htab
->tls_sec
)
778 if (htab
->text_index_section
!= NULL
)
779 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
781 if (strcmp (p
->name
, ".got") == 0
782 || strcmp (p
->name
, ".got.plt") == 0
783 || strcmp (p
->name
, ".plt") == 0)
787 if (htab
->dynobj
!= NULL
788 && (ip
= bfd_get_section_by_name (htab
->dynobj
, p
->name
)) != NULL
789 && (ip
->flags
& SEC_LINKER_CREATED
)
790 && ip
->output_section
== p
)
795 /* There shouldn't be section relative relocations
796 against any other section. */
802 /* Assign dynsym indices. In a shared library we generate a section
803 symbol for each output section, which come first. Next come symbols
804 which have been forced to local binding. Then all of the back-end
805 allocated local dynamic syms, followed by the rest of the global
809 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
810 struct bfd_link_info
*info
,
811 unsigned long *section_sym_count
)
813 unsigned long dynsymcount
= 0;
815 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
817 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
819 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
820 if ((p
->flags
& SEC_EXCLUDE
) == 0
821 && (p
->flags
& SEC_ALLOC
) != 0
822 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
823 elf_section_data (p
)->dynindx
= ++dynsymcount
;
825 elf_section_data (p
)->dynindx
= 0;
827 *section_sym_count
= dynsymcount
;
829 elf_link_hash_traverse (elf_hash_table (info
),
830 elf_link_renumber_local_hash_table_dynsyms
,
833 if (elf_hash_table (info
)->dynlocal
)
835 struct elf_link_local_dynamic_entry
*p
;
836 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
837 p
->dynindx
= ++dynsymcount
;
840 elf_link_hash_traverse (elf_hash_table (info
),
841 elf_link_renumber_hash_table_dynsyms
,
844 /* There is an unused NULL entry at the head of the table which
845 we must account for in our count. Unless there weren't any
846 symbols, which means we'll have no table at all. */
847 if (dynsymcount
!= 0)
850 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
854 /* Merge st_other field. */
857 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
858 Elf_Internal_Sym
*isym
, bfd_boolean definition
,
861 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
863 /* If st_other has a processor-specific meaning, specific
864 code might be needed here. We never merge the visibility
865 attribute with the one from a dynamic object. */
866 if (bed
->elf_backend_merge_symbol_attribute
)
867 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
870 /* If this symbol has default visibility and the user has requested
871 we not re-export it, then mark it as hidden. */
875 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
876 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
877 isym
->st_other
= (STV_HIDDEN
878 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
880 if (!dynamic
&& ELF_ST_VISIBILITY (isym
->st_other
) != 0)
882 unsigned char hvis
, symvis
, other
, nvis
;
884 /* Only merge the visibility. Leave the remainder of the
885 st_other field to elf_backend_merge_symbol_attribute. */
886 other
= h
->other
& ~ELF_ST_VISIBILITY (-1);
888 /* Combine visibilities, using the most constraining one. */
889 hvis
= ELF_ST_VISIBILITY (h
->other
);
890 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
896 nvis
= hvis
< symvis
? hvis
: symvis
;
898 h
->other
= other
| nvis
;
902 /* This function is called when we want to define a new symbol. It
903 handles the various cases which arise when we find a definition in
904 a dynamic object, or when there is already a definition in a
905 dynamic object. The new symbol is described by NAME, SYM, PSEC,
906 and PVALUE. We set SYM_HASH to the hash table entry. We set
907 OVERRIDE if the old symbol is overriding a new definition. We set
908 TYPE_CHANGE_OK if it is OK for the type to change. We set
909 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
910 change, we mean that we shouldn't warn if the type or size does
911 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
912 object is overridden by a regular object. */
915 _bfd_elf_merge_symbol (bfd
*abfd
,
916 struct bfd_link_info
*info
,
918 Elf_Internal_Sym
*sym
,
921 unsigned int *pold_alignment
,
922 struct elf_link_hash_entry
**sym_hash
,
924 bfd_boolean
*override
,
925 bfd_boolean
*type_change_ok
,
926 bfd_boolean
*size_change_ok
)
928 asection
*sec
, *oldsec
;
929 struct elf_link_hash_entry
*h
;
930 struct elf_link_hash_entry
*flip
;
933 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
934 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
935 const struct elf_backend_data
*bed
;
941 bind
= ELF_ST_BIND (sym
->st_info
);
943 /* Silently discard TLS symbols from --just-syms. There's no way to
944 combine a static TLS block with a new TLS block for this executable. */
945 if (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
946 && sec
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
952 if (! bfd_is_und_section (sec
))
953 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
955 h
= ((struct elf_link_hash_entry
*)
956 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
961 bed
= get_elf_backend_data (abfd
);
963 /* This code is for coping with dynamic objects, and is only useful
964 if we are doing an ELF link. */
965 if (!(*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
968 /* For merging, we only care about real symbols. */
970 while (h
->root
.type
== bfd_link_hash_indirect
971 || h
->root
.type
== bfd_link_hash_warning
)
972 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
974 /* We have to check it for every instance since the first few may be
975 refereences and not all compilers emit symbol type for undefined
977 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
979 /* If we just created the symbol, mark it as being an ELF symbol.
980 Other than that, there is nothing to do--there is no merge issue
981 with a newly defined symbol--so we just return. */
983 if (h
->root
.type
== bfd_link_hash_new
)
989 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
992 switch (h
->root
.type
)
999 case bfd_link_hash_undefined
:
1000 case bfd_link_hash_undefweak
:
1001 oldbfd
= h
->root
.u
.undef
.abfd
;
1005 case bfd_link_hash_defined
:
1006 case bfd_link_hash_defweak
:
1007 oldbfd
= h
->root
.u
.def
.section
->owner
;
1008 oldsec
= h
->root
.u
.def
.section
;
1011 case bfd_link_hash_common
:
1012 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1013 oldsec
= h
->root
.u
.c
.p
->section
;
1017 /* Differentiate strong and weak symbols. */
1018 newweak
= bind
== STB_WEAK
;
1019 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1020 || h
->root
.type
== bfd_link_hash_undefweak
);
1022 /* In cases involving weak versioned symbols, we may wind up trying
1023 to merge a symbol with itself. Catch that here, to avoid the
1024 confusion that results if we try to override a symbol with
1025 itself. The additional tests catch cases like
1026 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1027 dynamic object, which we do want to handle here. */
1029 && (newweak
|| oldweak
)
1030 && ((abfd
->flags
& DYNAMIC
) == 0
1031 || !h
->def_regular
))
1034 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1035 respectively, is from a dynamic object. */
1037 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1041 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1042 else if (oldsec
!= NULL
)
1044 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1045 indices used by MIPS ELF. */
1046 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1049 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1050 respectively, appear to be a definition rather than reference. */
1052 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1054 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1055 && h
->root
.type
!= bfd_link_hash_undefweak
1056 && h
->root
.type
!= bfd_link_hash_common
);
1058 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1059 respectively, appear to be a function. */
1061 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1062 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1064 oldfunc
= (h
->type
!= STT_NOTYPE
1065 && bed
->is_function_type (h
->type
));
1067 /* When we try to create a default indirect symbol from the dynamic
1068 definition with the default version, we skip it if its type and
1069 the type of existing regular definition mismatch. We only do it
1070 if the existing regular definition won't be dynamic. */
1071 if (pold_alignment
== NULL
1073 && !info
->export_dynamic
1078 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
1079 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1080 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1081 && h
->type
!= STT_NOTYPE
1082 && !(newfunc
&& oldfunc
))
1088 /* Check TLS symbol. We don't check undefined symbol introduced by
1090 if ((ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
)
1091 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1095 bfd_boolean ntdef
, tdef
;
1096 asection
*ntsec
, *tsec
;
1098 if (h
->type
== STT_TLS
)
1118 (*_bfd_error_handler
)
1119 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1120 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1121 else if (!tdef
&& !ntdef
)
1122 (*_bfd_error_handler
)
1123 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1124 tbfd
, ntbfd
, h
->root
.root
.string
);
1126 (*_bfd_error_handler
)
1127 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1128 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1130 (*_bfd_error_handler
)
1131 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1132 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1134 bfd_set_error (bfd_error_bad_value
);
1138 /* We need to remember if a symbol has a definition in a dynamic
1139 object or is weak in all dynamic objects. Internal and hidden
1140 visibility will make it unavailable to dynamic objects. */
1141 if (newdyn
&& !h
->dynamic_def
)
1143 if (!bfd_is_und_section (sec
))
1147 /* Check if this symbol is weak in all dynamic objects. If it
1148 is the first time we see it in a dynamic object, we mark
1149 if it is weak. Otherwise, we clear it. */
1150 if (!h
->ref_dynamic
)
1152 if (bind
== STB_WEAK
)
1153 h
->dynamic_weak
= 1;
1155 else if (bind
!= STB_WEAK
)
1156 h
->dynamic_weak
= 0;
1160 /* If the old symbol has non-default visibility, we ignore the new
1161 definition from a dynamic object. */
1163 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1164 && !bfd_is_und_section (sec
))
1167 /* Make sure this symbol is dynamic. */
1169 /* A protected symbol has external availability. Make sure it is
1170 recorded as dynamic.
1172 FIXME: Should we check type and size for protected symbol? */
1173 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1174 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1179 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1182 /* If the new symbol with non-default visibility comes from a
1183 relocatable file and the old definition comes from a dynamic
1184 object, we remove the old definition. */
1185 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1187 /* Handle the case where the old dynamic definition is
1188 default versioned. We need to copy the symbol info from
1189 the symbol with default version to the normal one if it
1190 was referenced before. */
1193 struct elf_link_hash_entry
*vh
= *sym_hash
;
1195 vh
->root
.type
= h
->root
.type
;
1196 h
->root
.type
= bfd_link_hash_indirect
;
1197 (*bed
->elf_backend_copy_indirect_symbol
) (info
, vh
, h
);
1198 /* Protected symbols will override the dynamic definition
1199 with default version. */
1200 if (ELF_ST_VISIBILITY (sym
->st_other
) == STV_PROTECTED
)
1202 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) vh
;
1203 vh
->dynamic_def
= 1;
1204 vh
->ref_dynamic
= 1;
1208 h
->root
.type
= vh
->root
.type
;
1209 vh
->ref_dynamic
= 0;
1210 /* We have to hide it here since it was made dynamic
1211 global with extra bits when the symbol info was
1212 copied from the old dynamic definition. */
1213 (*bed
->elf_backend_hide_symbol
) (info
, vh
, TRUE
);
1221 if ((h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1222 && bfd_is_und_section (sec
))
1224 /* If the new symbol is undefined and the old symbol was
1225 also undefined before, we need to make sure
1226 _bfd_generic_link_add_one_symbol doesn't mess
1227 up the linker hash table undefs list. Since the old
1228 definition came from a dynamic object, it is still on the
1230 h
->root
.type
= bfd_link_hash_undefined
;
1231 h
->root
.u
.undef
.abfd
= abfd
;
1235 h
->root
.type
= bfd_link_hash_new
;
1236 h
->root
.u
.undef
.abfd
= NULL
;
1245 /* FIXME: Should we check type and size for protected symbol? */
1251 if (bind
== STB_GNU_UNIQUE
)
1252 h
->unique_global
= 1;
1254 /* If a new weak symbol definition comes from a regular file and the
1255 old symbol comes from a dynamic library, we treat the new one as
1256 strong. Similarly, an old weak symbol definition from a regular
1257 file is treated as strong when the new symbol comes from a dynamic
1258 library. Further, an old weak symbol from a dynamic library is
1259 treated as strong if the new symbol is from a dynamic library.
1260 This reflects the way glibc's ld.so works.
1262 Do this before setting *type_change_ok or *size_change_ok so that
1263 we warn properly when dynamic library symbols are overridden. */
1265 if (newdef
&& !newdyn
&& olddyn
)
1267 if (olddef
&& newdyn
)
1270 /* Allow changes between different types of function symbol. */
1271 if (newfunc
&& oldfunc
)
1272 *type_change_ok
= TRUE
;
1274 /* It's OK to change the type if either the existing symbol or the
1275 new symbol is weak. A type change is also OK if the old symbol
1276 is undefined and the new symbol is defined. */
1281 && h
->root
.type
== bfd_link_hash_undefined
))
1282 *type_change_ok
= TRUE
;
1284 /* It's OK to change the size if either the existing symbol or the
1285 new symbol is weak, or if the old symbol is undefined. */
1288 || h
->root
.type
== bfd_link_hash_undefined
)
1289 *size_change_ok
= TRUE
;
1291 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1292 symbol, respectively, appears to be a common symbol in a dynamic
1293 object. If a symbol appears in an uninitialized section, and is
1294 not weak, and is not a function, then it may be a common symbol
1295 which was resolved when the dynamic object was created. We want
1296 to treat such symbols specially, because they raise special
1297 considerations when setting the symbol size: if the symbol
1298 appears as a common symbol in a regular object, and the size in
1299 the regular object is larger, we must make sure that we use the
1300 larger size. This problematic case can always be avoided in C,
1301 but it must be handled correctly when using Fortran shared
1304 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1305 likewise for OLDDYNCOMMON and OLDDEF.
1307 Note that this test is just a heuristic, and that it is quite
1308 possible to have an uninitialized symbol in a shared object which
1309 is really a definition, rather than a common symbol. This could
1310 lead to some minor confusion when the symbol really is a common
1311 symbol in some regular object. However, I think it will be
1317 && (sec
->flags
& SEC_ALLOC
) != 0
1318 && (sec
->flags
& SEC_LOAD
) == 0
1321 newdyncommon
= TRUE
;
1323 newdyncommon
= FALSE
;
1327 && h
->root
.type
== bfd_link_hash_defined
1329 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1330 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1333 olddyncommon
= TRUE
;
1335 olddyncommon
= FALSE
;
1337 /* We now know everything about the old and new symbols. We ask the
1338 backend to check if we can merge them. */
1339 if (bed
->merge_symbol
1340 && !bed
->merge_symbol (info
, sym_hash
, h
, sym
, psec
, pvalue
,
1341 pold_alignment
, skip
, override
,
1342 type_change_ok
, size_change_ok
,
1343 &newdyn
, &newdef
, &newdyncommon
, &newweak
,
1345 &olddyn
, &olddef
, &olddyncommon
, &oldweak
,
1349 /* If both the old and the new symbols look like common symbols in a
1350 dynamic object, set the size of the symbol to the larger of the
1355 && sym
->st_size
!= h
->size
)
1357 /* Since we think we have two common symbols, issue a multiple
1358 common warning if desired. Note that we only warn if the
1359 size is different. If the size is the same, we simply let
1360 the old symbol override the new one as normally happens with
1361 symbols defined in dynamic objects. */
1363 if (! ((*info
->callbacks
->multiple_common
)
1364 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1365 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1368 if (sym
->st_size
> h
->size
)
1369 h
->size
= sym
->st_size
;
1371 *size_change_ok
= TRUE
;
1374 /* If we are looking at a dynamic object, and we have found a
1375 definition, we need to see if the symbol was already defined by
1376 some other object. If so, we want to use the existing
1377 definition, and we do not want to report a multiple symbol
1378 definition error; we do this by clobbering *PSEC to be
1379 bfd_und_section_ptr.
1381 We treat a common symbol as a definition if the symbol in the
1382 shared library is a function, since common symbols always
1383 represent variables; this can cause confusion in principle, but
1384 any such confusion would seem to indicate an erroneous program or
1385 shared library. We also permit a common symbol in a regular
1386 object to override a weak symbol in a shared object. */
1391 || (h
->root
.type
== bfd_link_hash_common
1392 && (newweak
|| newfunc
))))
1396 newdyncommon
= FALSE
;
1398 *psec
= sec
= bfd_und_section_ptr
;
1399 *size_change_ok
= TRUE
;
1401 /* If we get here when the old symbol is a common symbol, then
1402 we are explicitly letting it override a weak symbol or
1403 function in a dynamic object, and we don't want to warn about
1404 a type change. If the old symbol is a defined symbol, a type
1405 change warning may still be appropriate. */
1407 if (h
->root
.type
== bfd_link_hash_common
)
1408 *type_change_ok
= TRUE
;
1411 /* Handle the special case of an old common symbol merging with a
1412 new symbol which looks like a common symbol in a shared object.
1413 We change *PSEC and *PVALUE to make the new symbol look like a
1414 common symbol, and let _bfd_generic_link_add_one_symbol do the
1418 && h
->root
.type
== bfd_link_hash_common
)
1422 newdyncommon
= FALSE
;
1423 *pvalue
= sym
->st_size
;
1424 *psec
= sec
= bed
->common_section (oldsec
);
1425 *size_change_ok
= TRUE
;
1428 /* Skip weak definitions of symbols that are already defined. */
1429 if (newdef
&& olddef
&& newweak
)
1433 /* Merge st_other. If the symbol already has a dynamic index,
1434 but visibility says it should not be visible, turn it into a
1436 elf_merge_st_other (abfd
, h
, sym
, newdef
, newdyn
);
1437 if (h
->dynindx
!= -1)
1438 switch (ELF_ST_VISIBILITY (h
->other
))
1442 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1447 /* If the old symbol is from a dynamic object, and the new symbol is
1448 a definition which is not from a dynamic object, then the new
1449 symbol overrides the old symbol. Symbols from regular files
1450 always take precedence over symbols from dynamic objects, even if
1451 they are defined after the dynamic object in the link.
1453 As above, we again permit a common symbol in a regular object to
1454 override a definition in a shared object if the shared object
1455 symbol is a function or is weak. */
1460 || (bfd_is_com_section (sec
)
1461 && (oldweak
|| oldfunc
)))
1466 /* Change the hash table entry to undefined, and let
1467 _bfd_generic_link_add_one_symbol do the right thing with the
1470 h
->root
.type
= bfd_link_hash_undefined
;
1471 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1472 *size_change_ok
= TRUE
;
1475 olddyncommon
= FALSE
;
1477 /* We again permit a type change when a common symbol may be
1478 overriding a function. */
1480 if (bfd_is_com_section (sec
))
1484 /* If a common symbol overrides a function, make sure
1485 that it isn't defined dynamically nor has type
1488 h
->type
= STT_NOTYPE
;
1490 *type_change_ok
= TRUE
;
1493 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1496 /* This union may have been set to be non-NULL when this symbol
1497 was seen in a dynamic object. We must force the union to be
1498 NULL, so that it is correct for a regular symbol. */
1499 h
->verinfo
.vertree
= NULL
;
1502 /* Handle the special case of a new common symbol merging with an
1503 old symbol that looks like it might be a common symbol defined in
1504 a shared object. Note that we have already handled the case in
1505 which a new common symbol should simply override the definition
1506 in the shared library. */
1509 && bfd_is_com_section (sec
)
1512 /* It would be best if we could set the hash table entry to a
1513 common symbol, but we don't know what to use for the section
1514 or the alignment. */
1515 if (! ((*info
->callbacks
->multiple_common
)
1516 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1517 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1520 /* If the presumed common symbol in the dynamic object is
1521 larger, pretend that the new symbol has its size. */
1523 if (h
->size
> *pvalue
)
1526 /* We need to remember the alignment required by the symbol
1527 in the dynamic object. */
1528 BFD_ASSERT (pold_alignment
);
1529 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1532 olddyncommon
= FALSE
;
1534 h
->root
.type
= bfd_link_hash_undefined
;
1535 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1537 *size_change_ok
= TRUE
;
1538 *type_change_ok
= TRUE
;
1540 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1543 h
->verinfo
.vertree
= NULL
;
1548 /* Handle the case where we had a versioned symbol in a dynamic
1549 library and now find a definition in a normal object. In this
1550 case, we make the versioned symbol point to the normal one. */
1551 flip
->root
.type
= h
->root
.type
;
1552 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1553 h
->root
.type
= bfd_link_hash_indirect
;
1554 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1555 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1559 flip
->ref_dynamic
= 1;
1566 /* This function is called to create an indirect symbol from the
1567 default for the symbol with the default version if needed. The
1568 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1569 set DYNSYM if the new indirect symbol is dynamic. */
1572 _bfd_elf_add_default_symbol (bfd
*abfd
,
1573 struct bfd_link_info
*info
,
1574 struct elf_link_hash_entry
*h
,
1576 Elf_Internal_Sym
*sym
,
1579 bfd_boolean
*dynsym
,
1580 bfd_boolean override
)
1582 bfd_boolean type_change_ok
;
1583 bfd_boolean size_change_ok
;
1586 struct elf_link_hash_entry
*hi
;
1587 struct bfd_link_hash_entry
*bh
;
1588 const struct elf_backend_data
*bed
;
1589 bfd_boolean collect
;
1590 bfd_boolean dynamic
;
1592 size_t len
, shortlen
;
1595 /* If this symbol has a version, and it is the default version, we
1596 create an indirect symbol from the default name to the fully
1597 decorated name. This will cause external references which do not
1598 specify a version to be bound to this version of the symbol. */
1599 p
= strchr (name
, ELF_VER_CHR
);
1600 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1605 /* We are overridden by an old definition. We need to check if we
1606 need to create the indirect symbol from the default name. */
1607 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1609 BFD_ASSERT (hi
!= NULL
);
1612 while (hi
->root
.type
== bfd_link_hash_indirect
1613 || hi
->root
.type
== bfd_link_hash_warning
)
1615 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1621 bed
= get_elf_backend_data (abfd
);
1622 collect
= bed
->collect
;
1623 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1625 shortlen
= p
- name
;
1626 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1627 if (shortname
== NULL
)
1629 memcpy (shortname
, name
, shortlen
);
1630 shortname
[shortlen
] = '\0';
1632 /* We are going to create a new symbol. Merge it with any existing
1633 symbol with this name. For the purposes of the merge, act as
1634 though we were defining the symbol we just defined, although we
1635 actually going to define an indirect symbol. */
1636 type_change_ok
= FALSE
;
1637 size_change_ok
= FALSE
;
1639 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1640 NULL
, &hi
, &skip
, &override
,
1641 &type_change_ok
, &size_change_ok
))
1650 if (! (_bfd_generic_link_add_one_symbol
1651 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1652 0, name
, FALSE
, collect
, &bh
)))
1654 hi
= (struct elf_link_hash_entry
*) bh
;
1658 /* In this case the symbol named SHORTNAME is overriding the
1659 indirect symbol we want to add. We were planning on making
1660 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1661 is the name without a version. NAME is the fully versioned
1662 name, and it is the default version.
1664 Overriding means that we already saw a definition for the
1665 symbol SHORTNAME in a regular object, and it is overriding
1666 the symbol defined in the dynamic object.
1668 When this happens, we actually want to change NAME, the
1669 symbol we just added, to refer to SHORTNAME. This will cause
1670 references to NAME in the shared object to become references
1671 to SHORTNAME in the regular object. This is what we expect
1672 when we override a function in a shared object: that the
1673 references in the shared object will be mapped to the
1674 definition in the regular object. */
1676 while (hi
->root
.type
== bfd_link_hash_indirect
1677 || hi
->root
.type
== bfd_link_hash_warning
)
1678 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1680 h
->root
.type
= bfd_link_hash_indirect
;
1681 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1685 hi
->ref_dynamic
= 1;
1689 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1694 /* Now set HI to H, so that the following code will set the
1695 other fields correctly. */
1699 /* Check if HI is a warning symbol. */
1700 if (hi
->root
.type
== bfd_link_hash_warning
)
1701 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1703 /* If there is a duplicate definition somewhere, then HI may not
1704 point to an indirect symbol. We will have reported an error to
1705 the user in that case. */
1707 if (hi
->root
.type
== bfd_link_hash_indirect
)
1709 struct elf_link_hash_entry
*ht
;
1711 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1712 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1714 /* See if the new flags lead us to realize that the symbol must
1720 if (! info
->executable
1726 if (hi
->ref_regular
)
1732 /* We also need to define an indirection from the nondefault version
1736 len
= strlen (name
);
1737 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
1738 if (shortname
== NULL
)
1740 memcpy (shortname
, name
, shortlen
);
1741 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1743 /* Once again, merge with any existing symbol. */
1744 type_change_ok
= FALSE
;
1745 size_change_ok
= FALSE
;
1747 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1748 NULL
, &hi
, &skip
, &override
,
1749 &type_change_ok
, &size_change_ok
))
1757 /* Here SHORTNAME is a versioned name, so we don't expect to see
1758 the type of override we do in the case above unless it is
1759 overridden by a versioned definition. */
1760 if (hi
->root
.type
!= bfd_link_hash_defined
1761 && hi
->root
.type
!= bfd_link_hash_defweak
)
1762 (*_bfd_error_handler
)
1763 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1769 if (! (_bfd_generic_link_add_one_symbol
1770 (info
, abfd
, shortname
, BSF_INDIRECT
,
1771 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1773 hi
= (struct elf_link_hash_entry
*) bh
;
1775 /* If there is a duplicate definition somewhere, then HI may not
1776 point to an indirect symbol. We will have reported an error
1777 to the user in that case. */
1779 if (hi
->root
.type
== bfd_link_hash_indirect
)
1781 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1783 /* See if the new flags lead us to realize that the symbol
1789 if (! info
->executable
1795 if (hi
->ref_regular
)
1805 /* This routine is used to export all defined symbols into the dynamic
1806 symbol table. It is called via elf_link_hash_traverse. */
1809 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1811 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1813 /* Ignore this if we won't export it. */
1814 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
1817 /* Ignore indirect symbols. These are added by the versioning code. */
1818 if (h
->root
.type
== bfd_link_hash_indirect
)
1821 if (h
->root
.type
== bfd_link_hash_warning
)
1822 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1824 if (h
->dynindx
== -1
1830 if (eif
->verdefs
== NULL
1831 || (bfd_find_version_for_sym (eif
->verdefs
, h
->root
.root
.string
, &hide
)
1834 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1845 /* Look through the symbols which are defined in other shared
1846 libraries and referenced here. Update the list of version
1847 dependencies. This will be put into the .gnu.version_r section.
1848 This function is called via elf_link_hash_traverse. */
1851 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1854 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
1855 Elf_Internal_Verneed
*t
;
1856 Elf_Internal_Vernaux
*a
;
1859 if (h
->root
.type
== bfd_link_hash_warning
)
1860 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1862 /* We only care about symbols defined in shared objects with version
1867 || h
->verinfo
.verdef
== NULL
)
1870 /* See if we already know about this version. */
1871 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1875 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1878 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1879 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1885 /* This is a new version. Add it to tree we are building. */
1890 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1893 rinfo
->failed
= TRUE
;
1897 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1898 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1899 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
1903 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1906 rinfo
->failed
= TRUE
;
1910 /* Note that we are copying a string pointer here, and testing it
1911 above. If bfd_elf_string_from_elf_section is ever changed to
1912 discard the string data when low in memory, this will have to be
1914 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1916 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1917 a
->vna_nextptr
= t
->vn_auxptr
;
1919 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1922 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1929 /* Figure out appropriate versions for all the symbols. We may not
1930 have the version number script until we have read all of the input
1931 files, so until that point we don't know which symbols should be
1932 local. This function is called via elf_link_hash_traverse. */
1935 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1937 struct elf_info_failed
*sinfo
;
1938 struct bfd_link_info
*info
;
1939 const struct elf_backend_data
*bed
;
1940 struct elf_info_failed eif
;
1944 sinfo
= (struct elf_info_failed
*) data
;
1947 if (h
->root
.type
== bfd_link_hash_warning
)
1948 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1950 /* Fix the symbol flags. */
1953 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1956 sinfo
->failed
= TRUE
;
1960 /* We only need version numbers for symbols defined in regular
1962 if (!h
->def_regular
)
1965 bed
= get_elf_backend_data (info
->output_bfd
);
1966 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1967 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1969 struct bfd_elf_version_tree
*t
;
1974 /* There are two consecutive ELF_VER_CHR characters if this is
1975 not a hidden symbol. */
1977 if (*p
== ELF_VER_CHR
)
1983 /* If there is no version string, we can just return out. */
1991 /* Look for the version. If we find it, it is no longer weak. */
1992 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1994 if (strcmp (t
->name
, p
) == 0)
1998 struct bfd_elf_version_expr
*d
;
2000 len
= p
- h
->root
.root
.string
;
2001 alc
= (char *) bfd_malloc (len
);
2004 sinfo
->failed
= TRUE
;
2007 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2008 alc
[len
- 1] = '\0';
2009 if (alc
[len
- 2] == ELF_VER_CHR
)
2010 alc
[len
- 2] = '\0';
2012 h
->verinfo
.vertree
= t
;
2016 if (t
->globals
.list
!= NULL
)
2017 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2019 /* See if there is anything to force this symbol to
2021 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2023 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2026 && ! info
->export_dynamic
)
2027 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2035 /* If we are building an application, we need to create a
2036 version node for this version. */
2037 if (t
== NULL
&& info
->executable
)
2039 struct bfd_elf_version_tree
**pp
;
2042 /* If we aren't going to export this symbol, we don't need
2043 to worry about it. */
2044 if (h
->dynindx
== -1)
2048 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
, amt
);
2051 sinfo
->failed
= TRUE
;
2056 t
->name_indx
= (unsigned int) -1;
2060 /* Don't count anonymous version tag. */
2061 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
2063 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2065 t
->vernum
= version_index
;
2069 h
->verinfo
.vertree
= t
;
2073 /* We could not find the version for a symbol when
2074 generating a shared archive. Return an error. */
2075 (*_bfd_error_handler
)
2076 (_("%B: version node not found for symbol %s"),
2077 info
->output_bfd
, h
->root
.root
.string
);
2078 bfd_set_error (bfd_error_bad_value
);
2079 sinfo
->failed
= TRUE
;
2087 /* If we don't have a version for this symbol, see if we can find
2089 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2093 h
->verinfo
.vertree
= bfd_find_version_for_sym (sinfo
->verdefs
,
2094 h
->root
.root
.string
, &hide
);
2095 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2096 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2102 /* Read and swap the relocs from the section indicated by SHDR. This
2103 may be either a REL or a RELA section. The relocations are
2104 translated into RELA relocations and stored in INTERNAL_RELOCS,
2105 which should have already been allocated to contain enough space.
2106 The EXTERNAL_RELOCS are a buffer where the external form of the
2107 relocations should be stored.
2109 Returns FALSE if something goes wrong. */
2112 elf_link_read_relocs_from_section (bfd
*abfd
,
2114 Elf_Internal_Shdr
*shdr
,
2115 void *external_relocs
,
2116 Elf_Internal_Rela
*internal_relocs
)
2118 const struct elf_backend_data
*bed
;
2119 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2120 const bfd_byte
*erela
;
2121 const bfd_byte
*erelaend
;
2122 Elf_Internal_Rela
*irela
;
2123 Elf_Internal_Shdr
*symtab_hdr
;
2126 /* Position ourselves at the start of the section. */
2127 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2130 /* Read the relocations. */
2131 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2134 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2135 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2137 bed
= get_elf_backend_data (abfd
);
2139 /* Convert the external relocations to the internal format. */
2140 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2141 swap_in
= bed
->s
->swap_reloc_in
;
2142 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2143 swap_in
= bed
->s
->swap_reloca_in
;
2146 bfd_set_error (bfd_error_wrong_format
);
2150 erela
= (const bfd_byte
*) external_relocs
;
2151 erelaend
= erela
+ shdr
->sh_size
;
2152 irela
= internal_relocs
;
2153 while (erela
< erelaend
)
2157 (*swap_in
) (abfd
, erela
, irela
);
2158 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2159 if (bed
->s
->arch_size
== 64)
2163 if ((size_t) r_symndx
>= nsyms
)
2165 (*_bfd_error_handler
)
2166 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2167 " for offset 0x%lx in section `%A'"),
2169 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2170 bfd_set_error (bfd_error_bad_value
);
2174 else if (r_symndx
!= STN_UNDEF
)
2176 (*_bfd_error_handler
)
2177 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2178 " when the object file has no symbol table"),
2180 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2181 bfd_set_error (bfd_error_bad_value
);
2184 irela
+= bed
->s
->int_rels_per_ext_rel
;
2185 erela
+= shdr
->sh_entsize
;
2191 /* Read and swap the relocs for a section O. They may have been
2192 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2193 not NULL, they are used as buffers to read into. They are known to
2194 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2195 the return value is allocated using either malloc or bfd_alloc,
2196 according to the KEEP_MEMORY argument. If O has two relocation
2197 sections (both REL and RELA relocations), then the REL_HDR
2198 relocations will appear first in INTERNAL_RELOCS, followed by the
2199 RELA_HDR relocations. */
2202 _bfd_elf_link_read_relocs (bfd
*abfd
,
2204 void *external_relocs
,
2205 Elf_Internal_Rela
*internal_relocs
,
2206 bfd_boolean keep_memory
)
2208 void *alloc1
= NULL
;
2209 Elf_Internal_Rela
*alloc2
= NULL
;
2210 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2211 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2212 Elf_Internal_Rela
*internal_rela_relocs
;
2214 if (esdo
->relocs
!= NULL
)
2215 return esdo
->relocs
;
2217 if (o
->reloc_count
== 0)
2220 if (internal_relocs
== NULL
)
2224 size
= o
->reloc_count
;
2225 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2227 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2229 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2230 if (internal_relocs
== NULL
)
2234 if (external_relocs
== NULL
)
2236 bfd_size_type size
= 0;
2239 size
+= esdo
->rel
.hdr
->sh_size
;
2241 size
+= esdo
->rela
.hdr
->sh_size
;
2243 alloc1
= bfd_malloc (size
);
2246 external_relocs
= alloc1
;
2249 internal_rela_relocs
= internal_relocs
;
2252 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2256 external_relocs
= (((bfd_byte
*) external_relocs
)
2257 + esdo
->rel
.hdr
->sh_size
);
2258 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2259 * bed
->s
->int_rels_per_ext_rel
);
2263 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2265 internal_rela_relocs
)))
2268 /* Cache the results for next time, if we can. */
2270 esdo
->relocs
= internal_relocs
;
2275 /* Don't free alloc2, since if it was allocated we are passing it
2276 back (under the name of internal_relocs). */
2278 return internal_relocs
;
2286 bfd_release (abfd
, alloc2
);
2293 /* Compute the size of, and allocate space for, REL_HDR which is the
2294 section header for a section containing relocations for O. */
2297 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2298 struct bfd_elf_section_reloc_data
*reldata
)
2300 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2302 /* That allows us to calculate the size of the section. */
2303 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2305 /* The contents field must last into write_object_contents, so we
2306 allocate it with bfd_alloc rather than malloc. Also since we
2307 cannot be sure that the contents will actually be filled in,
2308 we zero the allocated space. */
2309 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2310 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2313 if (reldata
->hashes
== NULL
&& reldata
->count
)
2315 struct elf_link_hash_entry
**p
;
2317 p
= (struct elf_link_hash_entry
**)
2318 bfd_zmalloc (reldata
->count
* sizeof (struct elf_link_hash_entry
*));
2322 reldata
->hashes
= p
;
2328 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2329 originated from the section given by INPUT_REL_HDR) to the
2333 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2334 asection
*input_section
,
2335 Elf_Internal_Shdr
*input_rel_hdr
,
2336 Elf_Internal_Rela
*internal_relocs
,
2337 struct elf_link_hash_entry
**rel_hash
2340 Elf_Internal_Rela
*irela
;
2341 Elf_Internal_Rela
*irelaend
;
2343 struct bfd_elf_section_reloc_data
*output_reldata
;
2344 Elf_Internal_Shdr
*output_rel_hdr
;
2345 asection
*output_section
;
2346 const struct elf_backend_data
*bed
;
2347 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2348 struct bfd_elf_section_data
*esdo
;
2350 output_section
= input_section
->output_section
;
2351 output_rel_hdr
= NULL
;
2353 bed
= get_elf_backend_data (output_bfd
);
2354 esdo
= elf_section_data (output_section
);
2355 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2357 output_reldata
= &esdo
->rel
;
2358 swap_out
= bed
->s
->swap_reloc_out
;
2360 else if (esdo
->rela
.hdr
2361 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2363 output_reldata
= &esdo
->rela
;
2364 swap_out
= bed
->s
->swap_reloca_out
;
2368 (*_bfd_error_handler
)
2369 (_("%B: relocation size mismatch in %B section %A"),
2370 output_bfd
, input_section
->owner
, input_section
);
2371 bfd_set_error (bfd_error_wrong_format
);
2375 erel
= output_reldata
->hdr
->contents
;
2376 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2377 irela
= internal_relocs
;
2378 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2379 * bed
->s
->int_rels_per_ext_rel
);
2380 while (irela
< irelaend
)
2382 (*swap_out
) (output_bfd
, irela
, erel
);
2383 irela
+= bed
->s
->int_rels_per_ext_rel
;
2384 erel
+= input_rel_hdr
->sh_entsize
;
2387 /* Bump the counter, so that we know where to add the next set of
2389 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2394 /* Make weak undefined symbols in PIE dynamic. */
2397 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2398 struct elf_link_hash_entry
*h
)
2402 && h
->root
.type
== bfd_link_hash_undefweak
)
2403 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2408 /* Fix up the flags for a symbol. This handles various cases which
2409 can only be fixed after all the input files are seen. This is
2410 currently called by both adjust_dynamic_symbol and
2411 assign_sym_version, which is unnecessary but perhaps more robust in
2412 the face of future changes. */
2415 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2416 struct elf_info_failed
*eif
)
2418 const struct elf_backend_data
*bed
;
2420 /* If this symbol was mentioned in a non-ELF file, try to set
2421 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2422 permit a non-ELF file to correctly refer to a symbol defined in
2423 an ELF dynamic object. */
2426 while (h
->root
.type
== bfd_link_hash_indirect
)
2427 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2429 if (h
->root
.type
!= bfd_link_hash_defined
2430 && h
->root
.type
!= bfd_link_hash_defweak
)
2433 h
->ref_regular_nonweak
= 1;
2437 if (h
->root
.u
.def
.section
->owner
!= NULL
2438 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2439 == bfd_target_elf_flavour
))
2442 h
->ref_regular_nonweak
= 1;
2448 if (h
->dynindx
== -1
2452 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2461 /* Unfortunately, NON_ELF is only correct if the symbol
2462 was first seen in a non-ELF file. Fortunately, if the symbol
2463 was first seen in an ELF file, we're probably OK unless the
2464 symbol was defined in a non-ELF file. Catch that case here.
2465 FIXME: We're still in trouble if the symbol was first seen in
2466 a dynamic object, and then later in a non-ELF regular object. */
2467 if ((h
->root
.type
== bfd_link_hash_defined
2468 || h
->root
.type
== bfd_link_hash_defweak
)
2470 && (h
->root
.u
.def
.section
->owner
!= NULL
2471 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2472 != bfd_target_elf_flavour
)
2473 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2474 && !h
->def_dynamic
)))
2478 /* Backend specific symbol fixup. */
2479 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2480 if (bed
->elf_backend_fixup_symbol
2481 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2484 /* If this is a final link, and the symbol was defined as a common
2485 symbol in a regular object file, and there was no definition in
2486 any dynamic object, then the linker will have allocated space for
2487 the symbol in a common section but the DEF_REGULAR
2488 flag will not have been set. */
2489 if (h
->root
.type
== bfd_link_hash_defined
2493 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2496 /* If -Bsymbolic was used (which means to bind references to global
2497 symbols to the definition within the shared object), and this
2498 symbol was defined in a regular object, then it actually doesn't
2499 need a PLT entry. Likewise, if the symbol has non-default
2500 visibility. If the symbol has hidden or internal visibility, we
2501 will force it local. */
2503 && eif
->info
->shared
2504 && is_elf_hash_table (eif
->info
->hash
)
2505 && (SYMBOLIC_BIND (eif
->info
, h
)
2506 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2509 bfd_boolean force_local
;
2511 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2512 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2513 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2516 /* If a weak undefined symbol has non-default visibility, we also
2517 hide it from the dynamic linker. */
2518 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2519 && h
->root
.type
== bfd_link_hash_undefweak
)
2520 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2522 /* If this is a weak defined symbol in a dynamic object, and we know
2523 the real definition in the dynamic object, copy interesting flags
2524 over to the real definition. */
2525 if (h
->u
.weakdef
!= NULL
)
2527 struct elf_link_hash_entry
*weakdef
;
2529 weakdef
= h
->u
.weakdef
;
2530 if (h
->root
.type
== bfd_link_hash_indirect
)
2531 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2533 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2534 || h
->root
.type
== bfd_link_hash_defweak
);
2535 BFD_ASSERT (weakdef
->def_dynamic
);
2537 /* If the real definition is defined by a regular object file,
2538 don't do anything special. See the longer description in
2539 _bfd_elf_adjust_dynamic_symbol, below. */
2540 if (weakdef
->def_regular
)
2541 h
->u
.weakdef
= NULL
;
2544 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2545 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2546 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2553 /* Make the backend pick a good value for a dynamic symbol. This is
2554 called via elf_link_hash_traverse, and also calls itself
2558 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2560 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2562 const struct elf_backend_data
*bed
;
2564 if (! is_elf_hash_table (eif
->info
->hash
))
2567 if (h
->root
.type
== bfd_link_hash_warning
)
2569 h
->got
= elf_hash_table (eif
->info
)->init_got_offset
;
2570 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2572 /* When warning symbols are created, they **replace** the "real"
2573 entry in the hash table, thus we never get to see the real
2574 symbol in a hash traversal. So look at it now. */
2575 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2578 /* Ignore indirect symbols. These are added by the versioning code. */
2579 if (h
->root
.type
== bfd_link_hash_indirect
)
2582 /* Fix the symbol flags. */
2583 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2586 /* If this symbol does not require a PLT entry, and it is not
2587 defined by a dynamic object, or is not referenced by a regular
2588 object, ignore it. We do have to handle a weak defined symbol,
2589 even if no regular object refers to it, if we decided to add it
2590 to the dynamic symbol table. FIXME: Do we normally need to worry
2591 about symbols which are defined by one dynamic object and
2592 referenced by another one? */
2594 && h
->type
!= STT_GNU_IFUNC
2598 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2600 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2604 /* If we've already adjusted this symbol, don't do it again. This
2605 can happen via a recursive call. */
2606 if (h
->dynamic_adjusted
)
2609 /* Don't look at this symbol again. Note that we must set this
2610 after checking the above conditions, because we may look at a
2611 symbol once, decide not to do anything, and then get called
2612 recursively later after REF_REGULAR is set below. */
2613 h
->dynamic_adjusted
= 1;
2615 /* If this is a weak definition, and we know a real definition, and
2616 the real symbol is not itself defined by a regular object file,
2617 then get a good value for the real definition. We handle the
2618 real symbol first, for the convenience of the backend routine.
2620 Note that there is a confusing case here. If the real definition
2621 is defined by a regular object file, we don't get the real symbol
2622 from the dynamic object, but we do get the weak symbol. If the
2623 processor backend uses a COPY reloc, then if some routine in the
2624 dynamic object changes the real symbol, we will not see that
2625 change in the corresponding weak symbol. This is the way other
2626 ELF linkers work as well, and seems to be a result of the shared
2629 I will clarify this issue. Most SVR4 shared libraries define the
2630 variable _timezone and define timezone as a weak synonym. The
2631 tzset call changes _timezone. If you write
2632 extern int timezone;
2634 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2635 you might expect that, since timezone is a synonym for _timezone,
2636 the same number will print both times. However, if the processor
2637 backend uses a COPY reloc, then actually timezone will be copied
2638 into your process image, and, since you define _timezone
2639 yourself, _timezone will not. Thus timezone and _timezone will
2640 wind up at different memory locations. The tzset call will set
2641 _timezone, leaving timezone unchanged. */
2643 if (h
->u
.weakdef
!= NULL
)
2645 /* If we get to this point, we know there is an implicit
2646 reference by a regular object file via the weak symbol H.
2647 FIXME: Is this really true? What if the traversal finds
2648 H->U.WEAKDEF before it finds H? */
2649 h
->u
.weakdef
->ref_regular
= 1;
2651 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2655 /* If a symbol has no type and no size and does not require a PLT
2656 entry, then we are probably about to do the wrong thing here: we
2657 are probably going to create a COPY reloc for an empty object.
2658 This case can arise when a shared object is built with assembly
2659 code, and the assembly code fails to set the symbol type. */
2661 && h
->type
== STT_NOTYPE
2663 (*_bfd_error_handler
)
2664 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2665 h
->root
.root
.string
);
2667 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2668 bed
= get_elf_backend_data (dynobj
);
2670 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2679 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2683 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry
*h
,
2686 unsigned int power_of_two
;
2688 asection
*sec
= h
->root
.u
.def
.section
;
2690 /* The section aligment of definition is the maximum alignment
2691 requirement of symbols defined in the section. Since we don't
2692 know the symbol alignment requirement, we start with the
2693 maximum alignment and check low bits of the symbol address
2694 for the minimum alignment. */
2695 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2696 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2697 while ((h
->root
.u
.def
.value
& mask
) != 0)
2703 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2706 /* Adjust the section alignment if needed. */
2707 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2712 /* We make sure that the symbol will be aligned properly. */
2713 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2715 /* Define the symbol as being at this point in DYNBSS. */
2716 h
->root
.u
.def
.section
= dynbss
;
2717 h
->root
.u
.def
.value
= dynbss
->size
;
2719 /* Increment the size of DYNBSS to make room for the symbol. */
2720 dynbss
->size
+= h
->size
;
2725 /* Adjust all external symbols pointing into SEC_MERGE sections
2726 to reflect the object merging within the sections. */
2729 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2733 if (h
->root
.type
== bfd_link_hash_warning
)
2734 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2736 if ((h
->root
.type
== bfd_link_hash_defined
2737 || h
->root
.type
== bfd_link_hash_defweak
)
2738 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2739 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2741 bfd
*output_bfd
= (bfd
*) data
;
2743 h
->root
.u
.def
.value
=
2744 _bfd_merged_section_offset (output_bfd
,
2745 &h
->root
.u
.def
.section
,
2746 elf_section_data (sec
)->sec_info
,
2747 h
->root
.u
.def
.value
);
2753 /* Returns false if the symbol referred to by H should be considered
2754 to resolve local to the current module, and true if it should be
2755 considered to bind dynamically. */
2758 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2759 struct bfd_link_info
*info
,
2760 bfd_boolean not_local_protected
)
2762 bfd_boolean binding_stays_local_p
;
2763 const struct elf_backend_data
*bed
;
2764 struct elf_link_hash_table
*hash_table
;
2769 while (h
->root
.type
== bfd_link_hash_indirect
2770 || h
->root
.type
== bfd_link_hash_warning
)
2771 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2773 /* If it was forced local, then clearly it's not dynamic. */
2774 if (h
->dynindx
== -1)
2776 if (h
->forced_local
)
2779 /* Identify the cases where name binding rules say that a
2780 visible symbol resolves locally. */
2781 binding_stays_local_p
= info
->executable
|| SYMBOLIC_BIND (info
, h
);
2783 switch (ELF_ST_VISIBILITY (h
->other
))
2790 hash_table
= elf_hash_table (info
);
2791 if (!is_elf_hash_table (hash_table
))
2794 bed
= get_elf_backend_data (hash_table
->dynobj
);
2796 /* Proper resolution for function pointer equality may require
2797 that these symbols perhaps be resolved dynamically, even though
2798 we should be resolving them to the current module. */
2799 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
2800 binding_stays_local_p
= TRUE
;
2807 /* If it isn't defined locally, then clearly it's dynamic. */
2808 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2811 /* Otherwise, the symbol is dynamic if binding rules don't tell
2812 us that it remains local. */
2813 return !binding_stays_local_p
;
2816 /* Return true if the symbol referred to by H should be considered
2817 to resolve local to the current module, and false otherwise. Differs
2818 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2819 undefined symbols. The two functions are virtually identical except
2820 for the place where forced_local and dynindx == -1 are tested. If
2821 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2822 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2823 the symbol is local only for defined symbols.
2824 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2825 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2826 treatment of undefined weak symbols. For those that do not make
2827 undefined weak symbols dynamic, both functions may return false. */
2830 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2831 struct bfd_link_info
*info
,
2832 bfd_boolean local_protected
)
2834 const struct elf_backend_data
*bed
;
2835 struct elf_link_hash_table
*hash_table
;
2837 /* If it's a local sym, of course we resolve locally. */
2841 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2842 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
2843 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
2846 /* Common symbols that become definitions don't get the DEF_REGULAR
2847 flag set, so test it first, and don't bail out. */
2848 if (ELF_COMMON_DEF_P (h
))
2850 /* If we don't have a definition in a regular file, then we can't
2851 resolve locally. The sym is either undefined or dynamic. */
2852 else if (!h
->def_regular
)
2855 /* Forced local symbols resolve locally. */
2856 if (h
->forced_local
)
2859 /* As do non-dynamic symbols. */
2860 if (h
->dynindx
== -1)
2863 /* At this point, we know the symbol is defined and dynamic. In an
2864 executable it must resolve locally, likewise when building symbolic
2865 shared libraries. */
2866 if (info
->executable
|| SYMBOLIC_BIND (info
, h
))
2869 /* Now deal with defined dynamic symbols in shared libraries. Ones
2870 with default visibility might not resolve locally. */
2871 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2874 hash_table
= elf_hash_table (info
);
2875 if (!is_elf_hash_table (hash_table
))
2878 bed
= get_elf_backend_data (hash_table
->dynobj
);
2880 /* STV_PROTECTED non-function symbols are local. */
2881 if (!bed
->is_function_type (h
->type
))
2884 /* Function pointer equality tests may require that STV_PROTECTED
2885 symbols be treated as dynamic symbols, even when we know that the
2886 dynamic linker will resolve them locally. */
2887 return local_protected
;
2890 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2891 aligned. Returns the first TLS output section. */
2893 struct bfd_section
*
2894 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2896 struct bfd_section
*sec
, *tls
;
2897 unsigned int align
= 0;
2899 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2900 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2904 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2905 if (sec
->alignment_power
> align
)
2906 align
= sec
->alignment_power
;
2908 elf_hash_table (info
)->tls_sec
= tls
;
2910 /* Ensure the alignment of the first section is the largest alignment,
2911 so that the tls segment starts aligned. */
2913 tls
->alignment_power
= align
;
2918 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2920 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2921 Elf_Internal_Sym
*sym
)
2923 const struct elf_backend_data
*bed
;
2925 /* Local symbols do not count, but target specific ones might. */
2926 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2927 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2930 bed
= get_elf_backend_data (abfd
);
2931 /* Function symbols do not count. */
2932 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
2935 /* If the section is undefined, then so is the symbol. */
2936 if (sym
->st_shndx
== SHN_UNDEF
)
2939 /* If the symbol is defined in the common section, then
2940 it is a common definition and so does not count. */
2941 if (bed
->common_definition (sym
))
2944 /* If the symbol is in a target specific section then we
2945 must rely upon the backend to tell us what it is. */
2946 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2947 /* FIXME - this function is not coded yet:
2949 return _bfd_is_global_symbol_definition (abfd, sym);
2951 Instead for now assume that the definition is not global,
2952 Even if this is wrong, at least the linker will behave
2953 in the same way that it used to do. */
2959 /* Search the symbol table of the archive element of the archive ABFD
2960 whose archive map contains a mention of SYMDEF, and determine if
2961 the symbol is defined in this element. */
2963 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2965 Elf_Internal_Shdr
* hdr
;
2966 bfd_size_type symcount
;
2967 bfd_size_type extsymcount
;
2968 bfd_size_type extsymoff
;
2969 Elf_Internal_Sym
*isymbuf
;
2970 Elf_Internal_Sym
*isym
;
2971 Elf_Internal_Sym
*isymend
;
2974 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2978 if (! bfd_check_format (abfd
, bfd_object
))
2981 /* If we have already included the element containing this symbol in the
2982 link then we do not need to include it again. Just claim that any symbol
2983 it contains is not a definition, so that our caller will not decide to
2984 (re)include this element. */
2985 if (abfd
->archive_pass
)
2988 /* Select the appropriate symbol table. */
2989 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2990 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2992 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2994 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2996 /* The sh_info field of the symtab header tells us where the
2997 external symbols start. We don't care about the local symbols. */
2998 if (elf_bad_symtab (abfd
))
3000 extsymcount
= symcount
;
3005 extsymcount
= symcount
- hdr
->sh_info
;
3006 extsymoff
= hdr
->sh_info
;
3009 if (extsymcount
== 0)
3012 /* Read in the symbol table. */
3013 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3015 if (isymbuf
== NULL
)
3018 /* Scan the symbol table looking for SYMDEF. */
3020 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3024 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3029 if (strcmp (name
, symdef
->name
) == 0)
3031 result
= is_global_data_symbol_definition (abfd
, isym
);
3041 /* Add an entry to the .dynamic table. */
3044 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3048 struct elf_link_hash_table
*hash_table
;
3049 const struct elf_backend_data
*bed
;
3051 bfd_size_type newsize
;
3052 bfd_byte
*newcontents
;
3053 Elf_Internal_Dyn dyn
;
3055 hash_table
= elf_hash_table (info
);
3056 if (! is_elf_hash_table (hash_table
))
3059 bed
= get_elf_backend_data (hash_table
->dynobj
);
3060 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3061 BFD_ASSERT (s
!= NULL
);
3063 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3064 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3065 if (newcontents
== NULL
)
3069 dyn
.d_un
.d_val
= val
;
3070 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3073 s
->contents
= newcontents
;
3078 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3079 otherwise just check whether one already exists. Returns -1 on error,
3080 1 if a DT_NEEDED tag already exists, and 0 on success. */
3083 elf_add_dt_needed_tag (bfd
*abfd
,
3084 struct bfd_link_info
*info
,
3088 struct elf_link_hash_table
*hash_table
;
3089 bfd_size_type oldsize
;
3090 bfd_size_type strindex
;
3092 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3095 hash_table
= elf_hash_table (info
);
3096 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
3097 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3098 if (strindex
== (bfd_size_type
) -1)
3101 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
3104 const struct elf_backend_data
*bed
;
3107 bed
= get_elf_backend_data (hash_table
->dynobj
);
3108 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3110 for (extdyn
= sdyn
->contents
;
3111 extdyn
< sdyn
->contents
+ sdyn
->size
;
3112 extdyn
+= bed
->s
->sizeof_dyn
)
3114 Elf_Internal_Dyn dyn
;
3116 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3117 if (dyn
.d_tag
== DT_NEEDED
3118 && dyn
.d_un
.d_val
== strindex
)
3120 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3128 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3131 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3135 /* We were just checking for existence of the tag. */
3136 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3142 on_needed_list (const char *soname
, struct bfd_link_needed_list
*needed
)
3144 for (; needed
!= NULL
; needed
= needed
->next
)
3145 if (strcmp (soname
, needed
->name
) == 0)
3151 /* Sort symbol by value and section. */
3153 elf_sort_symbol (const void *arg1
, const void *arg2
)
3155 const struct elf_link_hash_entry
*h1
;
3156 const struct elf_link_hash_entry
*h2
;
3157 bfd_signed_vma vdiff
;
3159 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3160 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3161 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3163 return vdiff
> 0 ? 1 : -1;
3166 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3168 return sdiff
> 0 ? 1 : -1;
3173 /* This function is used to adjust offsets into .dynstr for
3174 dynamic symbols. This is called via elf_link_hash_traverse. */
3177 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3179 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3181 if (h
->root
.type
== bfd_link_hash_warning
)
3182 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3184 if (h
->dynindx
!= -1)
3185 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3189 /* Assign string offsets in .dynstr, update all structures referencing
3193 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3195 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3196 struct elf_link_local_dynamic_entry
*entry
;
3197 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3198 bfd
*dynobj
= hash_table
->dynobj
;
3201 const struct elf_backend_data
*bed
;
3204 _bfd_elf_strtab_finalize (dynstr
);
3205 size
= _bfd_elf_strtab_size (dynstr
);
3207 bed
= get_elf_backend_data (dynobj
);
3208 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3209 BFD_ASSERT (sdyn
!= NULL
);
3211 /* Update all .dynamic entries referencing .dynstr strings. */
3212 for (extdyn
= sdyn
->contents
;
3213 extdyn
< sdyn
->contents
+ sdyn
->size
;
3214 extdyn
+= bed
->s
->sizeof_dyn
)
3216 Elf_Internal_Dyn dyn
;
3218 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3222 dyn
.d_un
.d_val
= size
;
3232 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3237 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3240 /* Now update local dynamic symbols. */
3241 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3242 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3243 entry
->isym
.st_name
);
3245 /* And the rest of dynamic symbols. */
3246 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3248 /* Adjust version definitions. */
3249 if (elf_tdata (output_bfd
)->cverdefs
)
3254 Elf_Internal_Verdef def
;
3255 Elf_Internal_Verdaux defaux
;
3257 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3261 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3263 p
+= sizeof (Elf_External_Verdef
);
3264 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3266 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3268 _bfd_elf_swap_verdaux_in (output_bfd
,
3269 (Elf_External_Verdaux
*) p
, &defaux
);
3270 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3272 _bfd_elf_swap_verdaux_out (output_bfd
,
3273 &defaux
, (Elf_External_Verdaux
*) p
);
3274 p
+= sizeof (Elf_External_Verdaux
);
3277 while (def
.vd_next
);
3280 /* Adjust version references. */
3281 if (elf_tdata (output_bfd
)->verref
)
3286 Elf_Internal_Verneed need
;
3287 Elf_Internal_Vernaux needaux
;
3289 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3293 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3295 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3296 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3297 (Elf_External_Verneed
*) p
);
3298 p
+= sizeof (Elf_External_Verneed
);
3299 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3301 _bfd_elf_swap_vernaux_in (output_bfd
,
3302 (Elf_External_Vernaux
*) p
, &needaux
);
3303 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3305 _bfd_elf_swap_vernaux_out (output_bfd
,
3307 (Elf_External_Vernaux
*) p
);
3308 p
+= sizeof (Elf_External_Vernaux
);
3311 while (need
.vn_next
);
3317 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3318 The default is to only match when the INPUT and OUTPUT are exactly
3322 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3323 const bfd_target
*output
)
3325 return input
== output
;
3328 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3329 This version is used when different targets for the same architecture
3330 are virtually identical. */
3333 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3334 const bfd_target
*output
)
3336 const struct elf_backend_data
*obed
, *ibed
;
3338 if (input
== output
)
3341 ibed
= xvec_get_elf_backend_data (input
);
3342 obed
= xvec_get_elf_backend_data (output
);
3344 if (ibed
->arch
!= obed
->arch
)
3347 /* If both backends are using this function, deem them compatible. */
3348 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3351 /* Add symbols from an ELF object file to the linker hash table. */
3354 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3356 Elf_Internal_Ehdr
*ehdr
;
3357 Elf_Internal_Shdr
*hdr
;
3358 bfd_size_type symcount
;
3359 bfd_size_type extsymcount
;
3360 bfd_size_type extsymoff
;
3361 struct elf_link_hash_entry
**sym_hash
;
3362 bfd_boolean dynamic
;
3363 Elf_External_Versym
*extversym
= NULL
;
3364 Elf_External_Versym
*ever
;
3365 struct elf_link_hash_entry
*weaks
;
3366 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3367 bfd_size_type nondeflt_vers_cnt
= 0;
3368 Elf_Internal_Sym
*isymbuf
= NULL
;
3369 Elf_Internal_Sym
*isym
;
3370 Elf_Internal_Sym
*isymend
;
3371 const struct elf_backend_data
*bed
;
3372 bfd_boolean add_needed
;
3373 struct elf_link_hash_table
*htab
;
3375 void *alloc_mark
= NULL
;
3376 struct bfd_hash_entry
**old_table
= NULL
;
3377 unsigned int old_size
= 0;
3378 unsigned int old_count
= 0;
3379 void *old_tab
= NULL
;
3382 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3383 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3384 long old_dynsymcount
= 0;
3386 size_t hashsize
= 0;
3388 htab
= elf_hash_table (info
);
3389 bed
= get_elf_backend_data (abfd
);
3391 if ((abfd
->flags
& DYNAMIC
) == 0)
3397 /* You can't use -r against a dynamic object. Also, there's no
3398 hope of using a dynamic object which does not exactly match
3399 the format of the output file. */
3400 if (info
->relocatable
3401 || !is_elf_hash_table (htab
)
3402 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3404 if (info
->relocatable
)
3405 bfd_set_error (bfd_error_invalid_operation
);
3407 bfd_set_error (bfd_error_wrong_format
);
3412 ehdr
= elf_elfheader (abfd
);
3413 if (info
->warn_alternate_em
3414 && bed
->elf_machine_code
!= ehdr
->e_machine
3415 && ((bed
->elf_machine_alt1
!= 0
3416 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3417 || (bed
->elf_machine_alt2
!= 0
3418 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3419 info
->callbacks
->einfo
3420 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3421 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3423 /* As a GNU extension, any input sections which are named
3424 .gnu.warning.SYMBOL are treated as warning symbols for the given
3425 symbol. This differs from .gnu.warning sections, which generate
3426 warnings when they are included in an output file. */
3427 if (info
->executable
)
3431 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3435 name
= bfd_get_section_name (abfd
, s
);
3436 if (CONST_STRNEQ (name
, ".gnu.warning."))
3441 name
+= sizeof ".gnu.warning." - 1;
3443 /* If this is a shared object, then look up the symbol
3444 in the hash table. If it is there, and it is already
3445 been defined, then we will not be using the entry
3446 from this shared object, so we don't need to warn.
3447 FIXME: If we see the definition in a regular object
3448 later on, we will warn, but we shouldn't. The only
3449 fix is to keep track of what warnings we are supposed
3450 to emit, and then handle them all at the end of the
3454 struct elf_link_hash_entry
*h
;
3456 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3458 /* FIXME: What about bfd_link_hash_common? */
3460 && (h
->root
.type
== bfd_link_hash_defined
3461 || h
->root
.type
== bfd_link_hash_defweak
))
3463 /* We don't want to issue this warning. Clobber
3464 the section size so that the warning does not
3465 get copied into the output file. */
3472 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
3476 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3481 if (! (_bfd_generic_link_add_one_symbol
3482 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3483 FALSE
, bed
->collect
, NULL
)))
3486 if (! info
->relocatable
)
3488 /* Clobber the section size so that the warning does
3489 not get copied into the output file. */
3492 /* Also set SEC_EXCLUDE, so that symbols defined in
3493 the warning section don't get copied to the output. */
3494 s
->flags
|= SEC_EXCLUDE
;
3503 /* If we are creating a shared library, create all the dynamic
3504 sections immediately. We need to attach them to something,
3505 so we attach them to this BFD, provided it is the right
3506 format. FIXME: If there are no input BFD's of the same
3507 format as the output, we can't make a shared library. */
3509 && is_elf_hash_table (htab
)
3510 && info
->output_bfd
->xvec
== abfd
->xvec
3511 && !htab
->dynamic_sections_created
)
3513 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3517 else if (!is_elf_hash_table (htab
))
3522 const char *soname
= NULL
;
3524 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3527 /* ld --just-symbols and dynamic objects don't mix very well.
3528 ld shouldn't allow it. */
3529 if ((s
= abfd
->sections
) != NULL
3530 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3533 /* If this dynamic lib was specified on the command line with
3534 --as-needed in effect, then we don't want to add a DT_NEEDED
3535 tag unless the lib is actually used. Similary for libs brought
3536 in by another lib's DT_NEEDED. When --no-add-needed is used
3537 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3538 any dynamic library in DT_NEEDED tags in the dynamic lib at
3540 add_needed
= (elf_dyn_lib_class (abfd
)
3541 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3542 | DYN_NO_NEEDED
)) == 0;
3544 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3549 unsigned int elfsec
;
3550 unsigned long shlink
;
3552 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3559 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3560 if (elfsec
== SHN_BAD
)
3561 goto error_free_dyn
;
3562 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3564 for (extdyn
= dynbuf
;
3565 extdyn
< dynbuf
+ s
->size
;
3566 extdyn
+= bed
->s
->sizeof_dyn
)
3568 Elf_Internal_Dyn dyn
;
3570 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3571 if (dyn
.d_tag
== DT_SONAME
)
3573 unsigned int tagv
= dyn
.d_un
.d_val
;
3574 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3576 goto error_free_dyn
;
3578 if (dyn
.d_tag
== DT_NEEDED
)
3580 struct bfd_link_needed_list
*n
, **pn
;
3582 unsigned int tagv
= dyn
.d_un
.d_val
;
3584 amt
= sizeof (struct bfd_link_needed_list
);
3585 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3586 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3587 if (n
== NULL
|| fnm
== NULL
)
3588 goto error_free_dyn
;
3589 amt
= strlen (fnm
) + 1;
3590 anm
= (char *) bfd_alloc (abfd
, amt
);
3592 goto error_free_dyn
;
3593 memcpy (anm
, fnm
, amt
);
3597 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3601 if (dyn
.d_tag
== DT_RUNPATH
)
3603 struct bfd_link_needed_list
*n
, **pn
;
3605 unsigned int tagv
= dyn
.d_un
.d_val
;
3607 amt
= sizeof (struct bfd_link_needed_list
);
3608 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3609 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3610 if (n
== NULL
|| fnm
== NULL
)
3611 goto error_free_dyn
;
3612 amt
= strlen (fnm
) + 1;
3613 anm
= (char *) bfd_alloc (abfd
, amt
);
3615 goto error_free_dyn
;
3616 memcpy (anm
, fnm
, amt
);
3620 for (pn
= & runpath
;
3626 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3627 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3629 struct bfd_link_needed_list
*n
, **pn
;
3631 unsigned int tagv
= dyn
.d_un
.d_val
;
3633 amt
= sizeof (struct bfd_link_needed_list
);
3634 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3635 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3636 if (n
== NULL
|| fnm
== NULL
)
3637 goto error_free_dyn
;
3638 amt
= strlen (fnm
) + 1;
3639 anm
= (char *) bfd_alloc (abfd
, amt
);
3641 goto error_free_dyn
;
3642 memcpy (anm
, fnm
, amt
);
3652 if (dyn
.d_tag
== DT_AUDIT
)
3654 unsigned int tagv
= dyn
.d_un
.d_val
;
3655 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3662 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3663 frees all more recently bfd_alloc'd blocks as well. */
3669 struct bfd_link_needed_list
**pn
;
3670 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3675 /* We do not want to include any of the sections in a dynamic
3676 object in the output file. We hack by simply clobbering the
3677 list of sections in the BFD. This could be handled more
3678 cleanly by, say, a new section flag; the existing
3679 SEC_NEVER_LOAD flag is not the one we want, because that one
3680 still implies that the section takes up space in the output
3682 bfd_section_list_clear (abfd
);
3684 /* Find the name to use in a DT_NEEDED entry that refers to this
3685 object. If the object has a DT_SONAME entry, we use it.
3686 Otherwise, if the generic linker stuck something in
3687 elf_dt_name, we use that. Otherwise, we just use the file
3689 if (soname
== NULL
|| *soname
== '\0')
3691 soname
= elf_dt_name (abfd
);
3692 if (soname
== NULL
|| *soname
== '\0')
3693 soname
= bfd_get_filename (abfd
);
3696 /* Save the SONAME because sometimes the linker emulation code
3697 will need to know it. */
3698 elf_dt_name (abfd
) = soname
;
3700 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3704 /* If we have already included this dynamic object in the
3705 link, just ignore it. There is no reason to include a
3706 particular dynamic object more than once. */
3710 /* Save the DT_AUDIT entry for the linker emulation code. */
3711 elf_dt_audit (abfd
) = audit
;
3714 /* If this is a dynamic object, we always link against the .dynsym
3715 symbol table, not the .symtab symbol table. The dynamic linker
3716 will only see the .dynsym symbol table, so there is no reason to
3717 look at .symtab for a dynamic object. */
3719 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3720 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3722 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3724 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3726 /* The sh_info field of the symtab header tells us where the
3727 external symbols start. We don't care about the local symbols at
3729 if (elf_bad_symtab (abfd
))
3731 extsymcount
= symcount
;
3736 extsymcount
= symcount
- hdr
->sh_info
;
3737 extsymoff
= hdr
->sh_info
;
3741 if (extsymcount
!= 0)
3743 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3745 if (isymbuf
== NULL
)
3748 /* We store a pointer to the hash table entry for each external
3750 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3751 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
3752 if (sym_hash
== NULL
)
3753 goto error_free_sym
;
3754 elf_sym_hashes (abfd
) = sym_hash
;
3759 /* Read in any version definitions. */
3760 if (!_bfd_elf_slurp_version_tables (abfd
,
3761 info
->default_imported_symver
))
3762 goto error_free_sym
;
3764 /* Read in the symbol versions, but don't bother to convert them
3765 to internal format. */
3766 if (elf_dynversym (abfd
) != 0)
3768 Elf_Internal_Shdr
*versymhdr
;
3770 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3771 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
3772 if (extversym
== NULL
)
3773 goto error_free_sym
;
3774 amt
= versymhdr
->sh_size
;
3775 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3776 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3777 goto error_free_vers
;
3781 /* If we are loading an as-needed shared lib, save the symbol table
3782 state before we start adding symbols. If the lib turns out
3783 to be unneeded, restore the state. */
3784 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
3789 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
3791 struct bfd_hash_entry
*p
;
3792 struct elf_link_hash_entry
*h
;
3794 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3796 h
= (struct elf_link_hash_entry
*) p
;
3797 entsize
+= htab
->root
.table
.entsize
;
3798 if (h
->root
.type
== bfd_link_hash_warning
)
3799 entsize
+= htab
->root
.table
.entsize
;
3803 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
3804 hashsize
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3805 old_tab
= bfd_malloc (tabsize
+ entsize
+ hashsize
);
3806 if (old_tab
== NULL
)
3807 goto error_free_vers
;
3809 /* Remember the current objalloc pointer, so that all mem for
3810 symbols added can later be reclaimed. */
3811 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
3812 if (alloc_mark
== NULL
)
3813 goto error_free_vers
;
3815 /* Make a special call to the linker "notice" function to
3816 tell it that we are about to handle an as-needed lib. */
3817 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
3819 goto error_free_vers
;
3821 /* Clone the symbol table and sym hashes. Remember some
3822 pointers into the symbol table, and dynamic symbol count. */
3823 old_hash
= (char *) old_tab
+ tabsize
;
3824 old_ent
= (char *) old_hash
+ hashsize
;
3825 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
3826 memcpy (old_hash
, sym_hash
, hashsize
);
3827 old_undefs
= htab
->root
.undefs
;
3828 old_undefs_tail
= htab
->root
.undefs_tail
;
3829 old_table
= htab
->root
.table
.table
;
3830 old_size
= htab
->root
.table
.size
;
3831 old_count
= htab
->root
.table
.count
;
3832 old_dynsymcount
= htab
->dynsymcount
;
3834 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
3836 struct bfd_hash_entry
*p
;
3837 struct elf_link_hash_entry
*h
;
3839 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3841 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
3842 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3843 h
= (struct elf_link_hash_entry
*) p
;
3844 if (h
->root
.type
== bfd_link_hash_warning
)
3846 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
3847 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3854 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3855 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3857 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3861 asection
*sec
, *new_sec
;
3864 struct elf_link_hash_entry
*h
;
3865 bfd_boolean definition
;
3866 bfd_boolean size_change_ok
;
3867 bfd_boolean type_change_ok
;
3868 bfd_boolean new_weakdef
;
3869 bfd_boolean override
;
3871 unsigned int old_alignment
;
3873 bfd
* undef_bfd
= NULL
;
3877 flags
= BSF_NO_FLAGS
;
3879 value
= isym
->st_value
;
3881 common
= bed
->common_definition (isym
);
3883 bind
= ELF_ST_BIND (isym
->st_info
);
3887 /* This should be impossible, since ELF requires that all
3888 global symbols follow all local symbols, and that sh_info
3889 point to the first global symbol. Unfortunately, Irix 5
3894 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
3902 case STB_GNU_UNIQUE
:
3903 flags
= BSF_GNU_UNIQUE
;
3907 /* Leave it up to the processor backend. */
3911 if (isym
->st_shndx
== SHN_UNDEF
)
3912 sec
= bfd_und_section_ptr
;
3913 else if (isym
->st_shndx
== SHN_ABS
)
3914 sec
= bfd_abs_section_ptr
;
3915 else if (isym
->st_shndx
== SHN_COMMON
)
3917 sec
= bfd_com_section_ptr
;
3918 /* What ELF calls the size we call the value. What ELF
3919 calls the value we call the alignment. */
3920 value
= isym
->st_size
;
3924 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3926 sec
= bfd_abs_section_ptr
;
3927 else if (sec
->kept_section
)
3929 /* Symbols from discarded section are undefined. We keep
3931 sec
= bfd_und_section_ptr
;
3932 isym
->st_shndx
= SHN_UNDEF
;
3934 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3938 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3941 goto error_free_vers
;
3943 if (isym
->st_shndx
== SHN_COMMON
3944 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
3945 && !info
->relocatable
)
3947 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3951 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon",
3954 | SEC_LINKER_CREATED
3955 | SEC_THREAD_LOCAL
));
3957 goto error_free_vers
;
3961 else if (bed
->elf_add_symbol_hook
)
3963 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
3965 goto error_free_vers
;
3967 /* The hook function sets the name to NULL if this symbol
3968 should be skipped for some reason. */
3973 /* Sanity check that all possibilities were handled. */
3976 bfd_set_error (bfd_error_bad_value
);
3977 goto error_free_vers
;
3980 if (bfd_is_und_section (sec
)
3981 || bfd_is_com_section (sec
))
3986 size_change_ok
= FALSE
;
3987 type_change_ok
= bed
->type_change_ok
;
3992 if (is_elf_hash_table (htab
))
3994 Elf_Internal_Versym iver
;
3995 unsigned int vernum
= 0;
3998 /* If this is a definition of a symbol which was previously
3999 referenced in a non-weak manner then make a note of the bfd
4000 that contained the reference. This is used if we need to
4001 refer to the source of the reference later on. */
4002 if (! bfd_is_und_section (sec
))
4004 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4007 && h
->root
.type
== bfd_link_hash_undefined
4008 && h
->root
.u
.undef
.abfd
)
4009 undef_bfd
= h
->root
.u
.undef
.abfd
;
4014 if (info
->default_imported_symver
)
4015 /* Use the default symbol version created earlier. */
4016 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4021 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4023 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4025 /* If this is a hidden symbol, or if it is not version
4026 1, we append the version name to the symbol name.
4027 However, we do not modify a non-hidden absolute symbol
4028 if it is not a function, because it might be the version
4029 symbol itself. FIXME: What if it isn't? */
4030 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4032 && (!bfd_is_abs_section (sec
)
4033 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4036 size_t namelen
, verlen
, newlen
;
4039 if (isym
->st_shndx
!= SHN_UNDEF
)
4041 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4043 else if (vernum
> 1)
4045 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4051 (*_bfd_error_handler
)
4052 (_("%B: %s: invalid version %u (max %d)"),
4054 elf_tdata (abfd
)->cverdefs
);
4055 bfd_set_error (bfd_error_bad_value
);
4056 goto error_free_vers
;
4061 /* We cannot simply test for the number of
4062 entries in the VERNEED section since the
4063 numbers for the needed versions do not start
4065 Elf_Internal_Verneed
*t
;
4068 for (t
= elf_tdata (abfd
)->verref
;
4072 Elf_Internal_Vernaux
*a
;
4074 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4076 if (a
->vna_other
== vernum
)
4078 verstr
= a
->vna_nodename
;
4087 (*_bfd_error_handler
)
4088 (_("%B: %s: invalid needed version %d"),
4089 abfd
, name
, vernum
);
4090 bfd_set_error (bfd_error_bad_value
);
4091 goto error_free_vers
;
4095 namelen
= strlen (name
);
4096 verlen
= strlen (verstr
);
4097 newlen
= namelen
+ verlen
+ 2;
4098 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4099 && isym
->st_shndx
!= SHN_UNDEF
)
4102 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4103 if (newname
== NULL
)
4104 goto error_free_vers
;
4105 memcpy (newname
, name
, namelen
);
4106 p
= newname
+ namelen
;
4108 /* If this is a defined non-hidden version symbol,
4109 we add another @ to the name. This indicates the
4110 default version of the symbol. */
4111 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4112 && isym
->st_shndx
!= SHN_UNDEF
)
4114 memcpy (p
, verstr
, verlen
+ 1);
4119 /* If necessary, make a second attempt to locate the bfd
4120 containing an unresolved, non-weak reference to the
4122 if (! bfd_is_und_section (sec
) && undef_bfd
== NULL
)
4124 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4127 && h
->root
.type
== bfd_link_hash_undefined
4128 && h
->root
.u
.undef
.abfd
)
4129 undef_bfd
= h
->root
.u
.undef
.abfd
;
4132 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
,
4133 &value
, &old_alignment
,
4134 sym_hash
, &skip
, &override
,
4135 &type_change_ok
, &size_change_ok
))
4136 goto error_free_vers
;
4145 while (h
->root
.type
== bfd_link_hash_indirect
4146 || h
->root
.type
== bfd_link_hash_warning
)
4147 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4149 /* Remember the old alignment if this is a common symbol, so
4150 that we don't reduce the alignment later on. We can't
4151 check later, because _bfd_generic_link_add_one_symbol
4152 will set a default for the alignment which we want to
4153 override. We also remember the old bfd where the existing
4154 definition comes from. */
4155 switch (h
->root
.type
)
4160 case bfd_link_hash_defined
:
4161 case bfd_link_hash_defweak
:
4162 old_bfd
= h
->root
.u
.def
.section
->owner
;
4165 case bfd_link_hash_common
:
4166 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
4167 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
4171 if (elf_tdata (abfd
)->verdef
!= NULL
4175 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4178 if (! (_bfd_generic_link_add_one_symbol
4179 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4180 (struct bfd_link_hash_entry
**) sym_hash
)))
4181 goto error_free_vers
;
4184 while (h
->root
.type
== bfd_link_hash_indirect
4185 || h
->root
.type
== bfd_link_hash_warning
)
4186 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4189 if (is_elf_hash_table (htab
))
4190 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
4192 new_weakdef
= FALSE
;
4195 && (flags
& BSF_WEAK
) != 0
4196 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4197 && is_elf_hash_table (htab
)
4198 && h
->u
.weakdef
== NULL
)
4200 /* Keep a list of all weak defined non function symbols from
4201 a dynamic object, using the weakdef field. Later in this
4202 function we will set the weakdef field to the correct
4203 value. We only put non-function symbols from dynamic
4204 objects on this list, because that happens to be the only
4205 time we need to know the normal symbol corresponding to a
4206 weak symbol, and the information is time consuming to
4207 figure out. If the weakdef field is not already NULL,
4208 then this symbol was already defined by some previous
4209 dynamic object, and we will be using that previous
4210 definition anyhow. */
4212 h
->u
.weakdef
= weaks
;
4217 /* Set the alignment of a common symbol. */
4218 if ((common
|| bfd_is_com_section (sec
))
4219 && h
->root
.type
== bfd_link_hash_common
)
4224 align
= bfd_log2 (isym
->st_value
);
4227 /* The new symbol is a common symbol in a shared object.
4228 We need to get the alignment from the section. */
4229 align
= new_sec
->alignment_power
;
4231 if (align
> old_alignment
4232 /* Permit an alignment power of zero if an alignment of one
4233 is specified and no other alignments have been specified. */
4234 || (isym
->st_value
== 1 && old_alignment
== 0))
4235 h
->root
.u
.c
.p
->alignment_power
= align
;
4237 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4240 if (is_elf_hash_table (htab
))
4244 /* Check the alignment when a common symbol is involved. This
4245 can change when a common symbol is overridden by a normal
4246 definition or a common symbol is ignored due to the old
4247 normal definition. We need to make sure the maximum
4248 alignment is maintained. */
4249 if ((old_alignment
|| common
)
4250 && h
->root
.type
!= bfd_link_hash_common
)
4252 unsigned int common_align
;
4253 unsigned int normal_align
;
4254 unsigned int symbol_align
;
4258 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4259 if (h
->root
.u
.def
.section
->owner
!= NULL
4260 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
4262 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4263 if (normal_align
> symbol_align
)
4264 normal_align
= symbol_align
;
4267 normal_align
= symbol_align
;
4271 common_align
= old_alignment
;
4272 common_bfd
= old_bfd
;
4277 common_align
= bfd_log2 (isym
->st_value
);
4279 normal_bfd
= old_bfd
;
4282 if (normal_align
< common_align
)
4284 /* PR binutils/2735 */
4285 if (normal_bfd
== NULL
)
4286 (*_bfd_error_handler
)
4287 (_("Warning: alignment %u of common symbol `%s' in %B"
4288 " is greater than the alignment (%u) of its section %A"),
4289 common_bfd
, h
->root
.u
.def
.section
,
4290 1 << common_align
, name
, 1 << normal_align
);
4292 (*_bfd_error_handler
)
4293 (_("Warning: alignment %u of symbol `%s' in %B"
4294 " is smaller than %u in %B"),
4295 normal_bfd
, common_bfd
,
4296 1 << normal_align
, name
, 1 << common_align
);
4300 /* Remember the symbol size if it isn't undefined. */
4301 if ((isym
->st_size
!= 0 && isym
->st_shndx
!= SHN_UNDEF
)
4302 && (definition
|| h
->size
== 0))
4305 && h
->size
!= isym
->st_size
4306 && ! size_change_ok
)
4307 (*_bfd_error_handler
)
4308 (_("Warning: size of symbol `%s' changed"
4309 " from %lu in %B to %lu in %B"),
4311 name
, (unsigned long) h
->size
,
4312 (unsigned long) isym
->st_size
);
4314 h
->size
= isym
->st_size
;
4317 /* If this is a common symbol, then we always want H->SIZE
4318 to be the size of the common symbol. The code just above
4319 won't fix the size if a common symbol becomes larger. We
4320 don't warn about a size change here, because that is
4321 covered by --warn-common. Allow changed between different
4323 if (h
->root
.type
== bfd_link_hash_common
)
4324 h
->size
= h
->root
.u
.c
.size
;
4326 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4327 && (definition
|| h
->type
== STT_NOTYPE
))
4329 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
4331 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4333 if (type
== STT_GNU_IFUNC
4334 && (abfd
->flags
& DYNAMIC
) != 0)
4337 if (h
->type
!= type
)
4339 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
4340 (*_bfd_error_handler
)
4341 (_("Warning: type of symbol `%s' changed"
4342 " from %d to %d in %B"),
4343 abfd
, name
, h
->type
, type
);
4349 /* Merge st_other field. */
4350 elf_merge_st_other (abfd
, h
, isym
, definition
, dynamic
);
4352 /* Set a flag in the hash table entry indicating the type of
4353 reference or definition we just found. Keep a count of
4354 the number of dynamic symbols we find. A dynamic symbol
4355 is one which is referenced or defined by both a regular
4356 object and a shared object. */
4363 if (bind
!= STB_WEAK
)
4364 h
->ref_regular_nonweak
= 1;
4376 if (! info
->executable
4389 || (h
->u
.weakdef
!= NULL
4391 && h
->u
.weakdef
->dynindx
!= -1))
4395 if (definition
&& (sec
->flags
& SEC_DEBUGGING
) && !info
->relocatable
)
4397 /* We don't want to make debug symbol dynamic. */
4401 /* Check to see if we need to add an indirect symbol for
4402 the default name. */
4403 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
4404 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4405 &sec
, &value
, &dynsym
,
4407 goto error_free_vers
;
4409 if (definition
&& !dynamic
)
4411 char *p
= strchr (name
, ELF_VER_CHR
);
4412 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4414 /* Queue non-default versions so that .symver x, x@FOO
4415 aliases can be checked. */
4418 amt
= ((isymend
- isym
+ 1)
4419 * sizeof (struct elf_link_hash_entry
*));
4421 (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4423 goto error_free_vers
;
4425 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4429 if (dynsym
&& h
->dynindx
== -1)
4431 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4432 goto error_free_vers
;
4433 if (h
->u
.weakdef
!= NULL
4435 && h
->u
.weakdef
->dynindx
== -1)
4437 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4438 goto error_free_vers
;
4441 else if (dynsym
&& h
->dynindx
!= -1)
4442 /* If the symbol already has a dynamic index, but
4443 visibility says it should not be visible, turn it into
4445 switch (ELF_ST_VISIBILITY (h
->other
))
4449 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4459 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
4460 && !on_needed_list (elf_dt_name (abfd
), htab
->needed
))))
4463 const char *soname
= elf_dt_name (abfd
);
4465 /* A symbol from a library loaded via DT_NEEDED of some
4466 other library is referenced by a regular object.
4467 Add a DT_NEEDED entry for it. Issue an error if
4468 --no-add-needed is used and the reference was not
4470 if (undef_bfd
!= NULL
4471 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4473 (*_bfd_error_handler
)
4474 (_("%B: undefined reference to symbol '%s'"),
4476 (*_bfd_error_handler
)
4477 (_("note: '%s' is defined in DSO %B so try adding it to the linker command line"),
4479 bfd_set_error (bfd_error_invalid_operation
);
4480 goto error_free_vers
;
4483 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
4484 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
4487 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4489 goto error_free_vers
;
4491 BFD_ASSERT (ret
== 0);
4496 if (extversym
!= NULL
)
4502 if (isymbuf
!= NULL
)
4508 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4512 /* Restore the symbol table. */
4513 if (bed
->as_needed_cleanup
)
4514 (*bed
->as_needed_cleanup
) (abfd
, info
);
4515 old_hash
= (char *) old_tab
+ tabsize
;
4516 old_ent
= (char *) old_hash
+ hashsize
;
4517 sym_hash
= elf_sym_hashes (abfd
);
4518 htab
->root
.table
.table
= old_table
;
4519 htab
->root
.table
.size
= old_size
;
4520 htab
->root
.table
.count
= old_count
;
4521 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4522 memcpy (sym_hash
, old_hash
, hashsize
);
4523 htab
->root
.undefs
= old_undefs
;
4524 htab
->root
.undefs_tail
= old_undefs_tail
;
4525 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4527 struct bfd_hash_entry
*p
;
4528 struct elf_link_hash_entry
*h
;
4530 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4532 h
= (struct elf_link_hash_entry
*) p
;
4533 if (h
->root
.type
== bfd_link_hash_warning
)
4534 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4535 if (h
->dynindx
>= old_dynsymcount
)
4536 _bfd_elf_strtab_delref (htab
->dynstr
, h
->dynstr_index
);
4538 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4539 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4540 h
= (struct elf_link_hash_entry
*) p
;
4541 if (h
->root
.type
== bfd_link_hash_warning
)
4543 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4544 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4549 /* Make a special call to the linker "notice" function to
4550 tell it that symbols added for crefs may need to be removed. */
4551 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4553 goto error_free_vers
;
4556 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4558 if (nondeflt_vers
!= NULL
)
4559 free (nondeflt_vers
);
4563 if (old_tab
!= NULL
)
4565 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4567 goto error_free_vers
;
4572 /* Now that all the symbols from this input file are created, handle
4573 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4574 if (nondeflt_vers
!= NULL
)
4576 bfd_size_type cnt
, symidx
;
4578 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4580 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4581 char *shortname
, *p
;
4583 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4585 || (h
->root
.type
!= bfd_link_hash_defined
4586 && h
->root
.type
!= bfd_link_hash_defweak
))
4589 amt
= p
- h
->root
.root
.string
;
4590 shortname
= (char *) bfd_malloc (amt
+ 1);
4592 goto error_free_vers
;
4593 memcpy (shortname
, h
->root
.root
.string
, amt
);
4594 shortname
[amt
] = '\0';
4596 hi
= (struct elf_link_hash_entry
*)
4597 bfd_link_hash_lookup (&htab
->root
, shortname
,
4598 FALSE
, FALSE
, FALSE
);
4600 && hi
->root
.type
== h
->root
.type
4601 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4602 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4604 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4605 hi
->root
.type
= bfd_link_hash_indirect
;
4606 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4607 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4608 sym_hash
= elf_sym_hashes (abfd
);
4610 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4611 if (sym_hash
[symidx
] == hi
)
4613 sym_hash
[symidx
] = h
;
4619 free (nondeflt_vers
);
4620 nondeflt_vers
= NULL
;
4623 /* Now set the weakdefs field correctly for all the weak defined
4624 symbols we found. The only way to do this is to search all the
4625 symbols. Since we only need the information for non functions in
4626 dynamic objects, that's the only time we actually put anything on
4627 the list WEAKS. We need this information so that if a regular
4628 object refers to a symbol defined weakly in a dynamic object, the
4629 real symbol in the dynamic object is also put in the dynamic
4630 symbols; we also must arrange for both symbols to point to the
4631 same memory location. We could handle the general case of symbol
4632 aliasing, but a general symbol alias can only be generated in
4633 assembler code, handling it correctly would be very time
4634 consuming, and other ELF linkers don't handle general aliasing
4638 struct elf_link_hash_entry
**hpp
;
4639 struct elf_link_hash_entry
**hppend
;
4640 struct elf_link_hash_entry
**sorted_sym_hash
;
4641 struct elf_link_hash_entry
*h
;
4644 /* Since we have to search the whole symbol list for each weak
4645 defined symbol, search time for N weak defined symbols will be
4646 O(N^2). Binary search will cut it down to O(NlogN). */
4647 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4648 sorted_sym_hash
= (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4649 if (sorted_sym_hash
== NULL
)
4651 sym_hash
= sorted_sym_hash
;
4652 hpp
= elf_sym_hashes (abfd
);
4653 hppend
= hpp
+ extsymcount
;
4655 for (; hpp
< hppend
; hpp
++)
4659 && h
->root
.type
== bfd_link_hash_defined
4660 && !bed
->is_function_type (h
->type
))
4668 qsort (sorted_sym_hash
, sym_count
,
4669 sizeof (struct elf_link_hash_entry
*),
4672 while (weaks
!= NULL
)
4674 struct elf_link_hash_entry
*hlook
;
4681 weaks
= hlook
->u
.weakdef
;
4682 hlook
->u
.weakdef
= NULL
;
4684 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4685 || hlook
->root
.type
== bfd_link_hash_defweak
4686 || hlook
->root
.type
== bfd_link_hash_common
4687 || hlook
->root
.type
== bfd_link_hash_indirect
);
4688 slook
= hlook
->root
.u
.def
.section
;
4689 vlook
= hlook
->root
.u
.def
.value
;
4696 bfd_signed_vma vdiff
;
4698 h
= sorted_sym_hash
[idx
];
4699 vdiff
= vlook
- h
->root
.u
.def
.value
;
4706 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4719 /* We didn't find a value/section match. */
4723 for (i
= ilook
; i
< sym_count
; i
++)
4725 h
= sorted_sym_hash
[i
];
4727 /* Stop if value or section doesn't match. */
4728 if (h
->root
.u
.def
.value
!= vlook
4729 || h
->root
.u
.def
.section
!= slook
)
4731 else if (h
!= hlook
)
4733 hlook
->u
.weakdef
= h
;
4735 /* If the weak definition is in the list of dynamic
4736 symbols, make sure the real definition is put
4738 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4740 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4743 free (sorted_sym_hash
);
4748 /* If the real definition is in the list of dynamic
4749 symbols, make sure the weak definition is put
4750 there as well. If we don't do this, then the
4751 dynamic loader might not merge the entries for the
4752 real definition and the weak definition. */
4753 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4755 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4756 goto err_free_sym_hash
;
4763 free (sorted_sym_hash
);
4766 if (bed
->check_directives
4767 && !(*bed
->check_directives
) (abfd
, info
))
4770 /* If this object is the same format as the output object, and it is
4771 not a shared library, then let the backend look through the
4774 This is required to build global offset table entries and to
4775 arrange for dynamic relocs. It is not required for the
4776 particular common case of linking non PIC code, even when linking
4777 against shared libraries, but unfortunately there is no way of
4778 knowing whether an object file has been compiled PIC or not.
4779 Looking through the relocs is not particularly time consuming.
4780 The problem is that we must either (1) keep the relocs in memory,
4781 which causes the linker to require additional runtime memory or
4782 (2) read the relocs twice from the input file, which wastes time.
4783 This would be a good case for using mmap.
4785 I have no idea how to handle linking PIC code into a file of a
4786 different format. It probably can't be done. */
4788 && is_elf_hash_table (htab
)
4789 && bed
->check_relocs
!= NULL
4790 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4791 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4795 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4797 Elf_Internal_Rela
*internal_relocs
;
4800 if ((o
->flags
& SEC_RELOC
) == 0
4801 || o
->reloc_count
== 0
4802 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4803 && (o
->flags
& SEC_DEBUGGING
) != 0)
4804 || bfd_is_abs_section (o
->output_section
))
4807 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4809 if (internal_relocs
== NULL
)
4812 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4814 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4815 free (internal_relocs
);
4822 /* If this is a non-traditional link, try to optimize the handling
4823 of the .stab/.stabstr sections. */
4825 && ! info
->traditional_format
4826 && is_elf_hash_table (htab
)
4827 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4831 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4832 if (stabstr
!= NULL
)
4834 bfd_size_type string_offset
= 0;
4837 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4838 if (CONST_STRNEQ (stab
->name
, ".stab")
4839 && (!stab
->name
[5] ||
4840 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4841 && (stab
->flags
& SEC_MERGE
) == 0
4842 && !bfd_is_abs_section (stab
->output_section
))
4844 struct bfd_elf_section_data
*secdata
;
4846 secdata
= elf_section_data (stab
);
4847 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
4848 stabstr
, &secdata
->sec_info
,
4851 if (secdata
->sec_info
)
4852 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4857 if (is_elf_hash_table (htab
) && add_needed
)
4859 /* Add this bfd to the loaded list. */
4860 struct elf_link_loaded_list
*n
;
4862 n
= (struct elf_link_loaded_list
*)
4863 bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4867 n
->next
= htab
->loaded
;
4874 if (old_tab
!= NULL
)
4876 if (nondeflt_vers
!= NULL
)
4877 free (nondeflt_vers
);
4878 if (extversym
!= NULL
)
4881 if (isymbuf
!= NULL
)
4887 /* Return the linker hash table entry of a symbol that might be
4888 satisfied by an archive symbol. Return -1 on error. */
4890 struct elf_link_hash_entry
*
4891 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4892 struct bfd_link_info
*info
,
4895 struct elf_link_hash_entry
*h
;
4899 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4903 /* If this is a default version (the name contains @@), look up the
4904 symbol again with only one `@' as well as without the version.
4905 The effect is that references to the symbol with and without the
4906 version will be matched by the default symbol in the archive. */
4908 p
= strchr (name
, ELF_VER_CHR
);
4909 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4912 /* First check with only one `@'. */
4913 len
= strlen (name
);
4914 copy
= (char *) bfd_alloc (abfd
, len
);
4916 return (struct elf_link_hash_entry
*) 0 - 1;
4918 first
= p
- name
+ 1;
4919 memcpy (copy
, name
, first
);
4920 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4922 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4925 /* We also need to check references to the symbol without the
4927 copy
[first
- 1] = '\0';
4928 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4929 FALSE
, FALSE
, FALSE
);
4932 bfd_release (abfd
, copy
);
4936 /* Add symbols from an ELF archive file to the linker hash table. We
4937 don't use _bfd_generic_link_add_archive_symbols because of a
4938 problem which arises on UnixWare. The UnixWare libc.so is an
4939 archive which includes an entry libc.so.1 which defines a bunch of
4940 symbols. The libc.so archive also includes a number of other
4941 object files, which also define symbols, some of which are the same
4942 as those defined in libc.so.1. Correct linking requires that we
4943 consider each object file in turn, and include it if it defines any
4944 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4945 this; it looks through the list of undefined symbols, and includes
4946 any object file which defines them. When this algorithm is used on
4947 UnixWare, it winds up pulling in libc.so.1 early and defining a
4948 bunch of symbols. This means that some of the other objects in the
4949 archive are not included in the link, which is incorrect since they
4950 precede libc.so.1 in the archive.
4952 Fortunately, ELF archive handling is simpler than that done by
4953 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4954 oddities. In ELF, if we find a symbol in the archive map, and the
4955 symbol is currently undefined, we know that we must pull in that
4958 Unfortunately, we do have to make multiple passes over the symbol
4959 table until nothing further is resolved. */
4962 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4965 bfd_boolean
*defined
= NULL
;
4966 bfd_boolean
*included
= NULL
;
4970 const struct elf_backend_data
*bed
;
4971 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4972 (bfd
*, struct bfd_link_info
*, const char *);
4974 if (! bfd_has_map (abfd
))
4976 /* An empty archive is a special case. */
4977 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4979 bfd_set_error (bfd_error_no_armap
);
4983 /* Keep track of all symbols we know to be already defined, and all
4984 files we know to be already included. This is to speed up the
4985 second and subsequent passes. */
4986 c
= bfd_ardata (abfd
)->symdef_count
;
4990 amt
*= sizeof (bfd_boolean
);
4991 defined
= (bfd_boolean
*) bfd_zmalloc (amt
);
4992 included
= (bfd_boolean
*) bfd_zmalloc (amt
);
4993 if (defined
== NULL
|| included
== NULL
)
4996 symdefs
= bfd_ardata (abfd
)->symdefs
;
4997 bed
= get_elf_backend_data (abfd
);
4998 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5011 symdefend
= symdef
+ c
;
5012 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5014 struct elf_link_hash_entry
*h
;
5016 struct bfd_link_hash_entry
*undefs_tail
;
5019 if (defined
[i
] || included
[i
])
5021 if (symdef
->file_offset
== last
)
5027 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5028 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
5034 if (h
->root
.type
== bfd_link_hash_common
)
5036 /* We currently have a common symbol. The archive map contains
5037 a reference to this symbol, so we may want to include it. We
5038 only want to include it however, if this archive element
5039 contains a definition of the symbol, not just another common
5042 Unfortunately some archivers (including GNU ar) will put
5043 declarations of common symbols into their archive maps, as
5044 well as real definitions, so we cannot just go by the archive
5045 map alone. Instead we must read in the element's symbol
5046 table and check that to see what kind of symbol definition
5048 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5051 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5053 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5058 /* We need to include this archive member. */
5059 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5060 if (element
== NULL
)
5063 if (! bfd_check_format (element
, bfd_object
))
5066 /* Doublecheck that we have not included this object
5067 already--it should be impossible, but there may be
5068 something wrong with the archive. */
5069 if (element
->archive_pass
!= 0)
5071 bfd_set_error (bfd_error_bad_value
);
5074 element
->archive_pass
= 1;
5076 undefs_tail
= info
->hash
->undefs_tail
;
5078 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
5081 if (! bfd_link_add_symbols (element
, info
))
5084 /* If there are any new undefined symbols, we need to make
5085 another pass through the archive in order to see whether
5086 they can be defined. FIXME: This isn't perfect, because
5087 common symbols wind up on undefs_tail and because an
5088 undefined symbol which is defined later on in this pass
5089 does not require another pass. This isn't a bug, but it
5090 does make the code less efficient than it could be. */
5091 if (undefs_tail
!= info
->hash
->undefs_tail
)
5094 /* Look backward to mark all symbols from this object file
5095 which we have already seen in this pass. */
5099 included
[mark
] = TRUE
;
5104 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5106 /* We mark subsequent symbols from this object file as we go
5107 on through the loop. */
5108 last
= symdef
->file_offset
;
5119 if (defined
!= NULL
)
5121 if (included
!= NULL
)
5126 /* Given an ELF BFD, add symbols to the global hash table as
5130 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5132 switch (bfd_get_format (abfd
))
5135 return elf_link_add_object_symbols (abfd
, info
);
5137 return elf_link_add_archive_symbols (abfd
, info
);
5139 bfd_set_error (bfd_error_wrong_format
);
5144 struct hash_codes_info
5146 unsigned long *hashcodes
;
5150 /* This function will be called though elf_link_hash_traverse to store
5151 all hash value of the exported symbols in an array. */
5154 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5156 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5162 if (h
->root
.type
== bfd_link_hash_warning
)
5163 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5165 /* Ignore indirect symbols. These are added by the versioning code. */
5166 if (h
->dynindx
== -1)
5169 name
= h
->root
.root
.string
;
5170 p
= strchr (name
, ELF_VER_CHR
);
5173 alc
= (char *) bfd_malloc (p
- name
+ 1);
5179 memcpy (alc
, name
, p
- name
);
5180 alc
[p
- name
] = '\0';
5184 /* Compute the hash value. */
5185 ha
= bfd_elf_hash (name
);
5187 /* Store the found hash value in the array given as the argument. */
5188 *(inf
->hashcodes
)++ = ha
;
5190 /* And store it in the struct so that we can put it in the hash table
5192 h
->u
.elf_hash_value
= ha
;
5200 struct collect_gnu_hash_codes
5203 const struct elf_backend_data
*bed
;
5204 unsigned long int nsyms
;
5205 unsigned long int maskbits
;
5206 unsigned long int *hashcodes
;
5207 unsigned long int *hashval
;
5208 unsigned long int *indx
;
5209 unsigned long int *counts
;
5212 long int min_dynindx
;
5213 unsigned long int bucketcount
;
5214 unsigned long int symindx
;
5215 long int local_indx
;
5216 long int shift1
, shift2
;
5217 unsigned long int mask
;
5221 /* This function will be called though elf_link_hash_traverse to store
5222 all hash value of the exported symbols in an array. */
5225 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5227 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5233 if (h
->root
.type
== bfd_link_hash_warning
)
5234 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5236 /* Ignore indirect symbols. These are added by the versioning code. */
5237 if (h
->dynindx
== -1)
5240 /* Ignore also local symbols and undefined symbols. */
5241 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5244 name
= h
->root
.root
.string
;
5245 p
= strchr (name
, ELF_VER_CHR
);
5248 alc
= (char *) bfd_malloc (p
- name
+ 1);
5254 memcpy (alc
, name
, p
- name
);
5255 alc
[p
- name
] = '\0';
5259 /* Compute the hash value. */
5260 ha
= bfd_elf_gnu_hash (name
);
5262 /* Store the found hash value in the array for compute_bucket_count,
5263 and also for .dynsym reordering purposes. */
5264 s
->hashcodes
[s
->nsyms
] = ha
;
5265 s
->hashval
[h
->dynindx
] = ha
;
5267 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5268 s
->min_dynindx
= h
->dynindx
;
5276 /* This function will be called though elf_link_hash_traverse to do
5277 final dynaminc symbol renumbering. */
5280 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5282 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5283 unsigned long int bucket
;
5284 unsigned long int val
;
5286 if (h
->root
.type
== bfd_link_hash_warning
)
5287 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5289 /* Ignore indirect symbols. */
5290 if (h
->dynindx
== -1)
5293 /* Ignore also local symbols and undefined symbols. */
5294 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5296 if (h
->dynindx
>= s
->min_dynindx
)
5297 h
->dynindx
= s
->local_indx
++;
5301 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5302 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5303 & ((s
->maskbits
>> s
->shift1
) - 1);
5304 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5306 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5307 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5308 if (s
->counts
[bucket
] == 1)
5309 /* Last element terminates the chain. */
5311 bfd_put_32 (s
->output_bfd
, val
,
5312 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5313 --s
->counts
[bucket
];
5314 h
->dynindx
= s
->indx
[bucket
]++;
5318 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5321 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5323 return !(h
->forced_local
5324 || h
->root
.type
== bfd_link_hash_undefined
5325 || h
->root
.type
== bfd_link_hash_undefweak
5326 || ((h
->root
.type
== bfd_link_hash_defined
5327 || h
->root
.type
== bfd_link_hash_defweak
)
5328 && h
->root
.u
.def
.section
->output_section
== NULL
));
5331 /* Array used to determine the number of hash table buckets to use
5332 based on the number of symbols there are. If there are fewer than
5333 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5334 fewer than 37 we use 17 buckets, and so forth. We never use more
5335 than 32771 buckets. */
5337 static const size_t elf_buckets
[] =
5339 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5343 /* Compute bucket count for hashing table. We do not use a static set
5344 of possible tables sizes anymore. Instead we determine for all
5345 possible reasonable sizes of the table the outcome (i.e., the
5346 number of collisions etc) and choose the best solution. The
5347 weighting functions are not too simple to allow the table to grow
5348 without bounds. Instead one of the weighting factors is the size.
5349 Therefore the result is always a good payoff between few collisions
5350 (= short chain lengths) and table size. */
5352 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5353 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5354 unsigned long int nsyms
,
5357 size_t best_size
= 0;
5358 unsigned long int i
;
5360 /* We have a problem here. The following code to optimize the table
5361 size requires an integer type with more the 32 bits. If
5362 BFD_HOST_U_64_BIT is set we know about such a type. */
5363 #ifdef BFD_HOST_U_64_BIT
5368 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5369 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5370 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5371 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5372 unsigned long int *counts
;
5374 unsigned int no_improvement_count
= 0;
5376 /* Possible optimization parameters: if we have NSYMS symbols we say
5377 that the hashing table must at least have NSYMS/4 and at most
5379 minsize
= nsyms
/ 4;
5382 best_size
= maxsize
= nsyms
* 2;
5387 if ((best_size
& 31) == 0)
5391 /* Create array where we count the collisions in. We must use bfd_malloc
5392 since the size could be large. */
5394 amt
*= sizeof (unsigned long int);
5395 counts
= (unsigned long int *) bfd_malloc (amt
);
5399 /* Compute the "optimal" size for the hash table. The criteria is a
5400 minimal chain length. The minor criteria is (of course) the size
5402 for (i
= minsize
; i
< maxsize
; ++i
)
5404 /* Walk through the array of hashcodes and count the collisions. */
5405 BFD_HOST_U_64_BIT max
;
5406 unsigned long int j
;
5407 unsigned long int fact
;
5409 if (gnu_hash
&& (i
& 31) == 0)
5412 memset (counts
, '\0', i
* sizeof (unsigned long int));
5414 /* Determine how often each hash bucket is used. */
5415 for (j
= 0; j
< nsyms
; ++j
)
5416 ++counts
[hashcodes
[j
] % i
];
5418 /* For the weight function we need some information about the
5419 pagesize on the target. This is information need not be 100%
5420 accurate. Since this information is not available (so far) we
5421 define it here to a reasonable default value. If it is crucial
5422 to have a better value some day simply define this value. */
5423 # ifndef BFD_TARGET_PAGESIZE
5424 # define BFD_TARGET_PAGESIZE (4096)
5427 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5429 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5432 /* Variant 1: optimize for short chains. We add the squares
5433 of all the chain lengths (which favors many small chain
5434 over a few long chains). */
5435 for (j
= 0; j
< i
; ++j
)
5436 max
+= counts
[j
] * counts
[j
];
5438 /* This adds penalties for the overall size of the table. */
5439 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5442 /* Variant 2: Optimize a lot more for small table. Here we
5443 also add squares of the size but we also add penalties for
5444 empty slots (the +1 term). */
5445 for (j
= 0; j
< i
; ++j
)
5446 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5448 /* The overall size of the table is considered, but not as
5449 strong as in variant 1, where it is squared. */
5450 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5454 /* Compare with current best results. */
5455 if (max
< best_chlen
)
5459 no_improvement_count
= 0;
5461 /* PR 11843: Avoid futile long searches for the best bucket size
5462 when there are a large number of symbols. */
5463 else if (++no_improvement_count
== 100)
5470 #endif /* defined (BFD_HOST_U_64_BIT) */
5472 /* This is the fallback solution if no 64bit type is available or if we
5473 are not supposed to spend much time on optimizations. We select the
5474 bucket count using a fixed set of numbers. */
5475 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5477 best_size
= elf_buckets
[i
];
5478 if (nsyms
< elf_buckets
[i
+ 1])
5481 if (gnu_hash
&& best_size
< 2)
5488 /* Size any SHT_GROUP section for ld -r. */
5491 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
5495 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
5496 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
5497 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
5502 /* Set up the sizes and contents of the ELF dynamic sections. This is
5503 called by the ELF linker emulation before_allocation routine. We
5504 must set the sizes of the sections before the linker sets the
5505 addresses of the various sections. */
5508 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5511 const char *filter_shlib
,
5513 const char *depaudit
,
5514 const char * const *auxiliary_filters
,
5515 struct bfd_link_info
*info
,
5516 asection
**sinterpptr
,
5517 struct bfd_elf_version_tree
*verdefs
)
5519 bfd_size_type soname_indx
;
5521 const struct elf_backend_data
*bed
;
5522 struct elf_info_failed asvinfo
;
5526 soname_indx
= (bfd_size_type
) -1;
5528 if (!is_elf_hash_table (info
->hash
))
5531 bed
= get_elf_backend_data (output_bfd
);
5532 if (info
->execstack
)
5533 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
5534 else if (info
->noexecstack
)
5535 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
5539 asection
*notesec
= NULL
;
5542 for (inputobj
= info
->input_bfds
;
5544 inputobj
= inputobj
->link_next
)
5548 if (inputobj
->flags
& (DYNAMIC
| EXEC_P
| BFD_LINKER_CREATED
))
5550 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5553 if (s
->flags
& SEC_CODE
)
5557 else if (bed
->default_execstack
)
5562 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
5563 if (exec
&& info
->relocatable
5564 && notesec
->output_section
!= bfd_abs_section_ptr
)
5565 notesec
->output_section
->flags
|= SEC_CODE
;
5569 /* Any syms created from now on start with -1 in
5570 got.refcount/offset and plt.refcount/offset. */
5571 elf_hash_table (info
)->init_got_refcount
5572 = elf_hash_table (info
)->init_got_offset
;
5573 elf_hash_table (info
)->init_plt_refcount
5574 = elf_hash_table (info
)->init_plt_offset
;
5576 if (info
->relocatable
5577 && !_bfd_elf_size_group_sections (info
))
5580 /* The backend may have to create some sections regardless of whether
5581 we're dynamic or not. */
5582 if (bed
->elf_backend_always_size_sections
5583 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5586 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
5589 dynobj
= elf_hash_table (info
)->dynobj
;
5591 /* If there were no dynamic objects in the link, there is nothing to
5596 if (elf_hash_table (info
)->dynamic_sections_created
)
5598 struct elf_info_failed eif
;
5599 struct elf_link_hash_entry
*h
;
5601 struct bfd_elf_version_tree
*t
;
5602 struct bfd_elf_version_expr
*d
;
5604 bfd_boolean all_defined
;
5606 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
5607 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
5611 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5613 if (soname_indx
== (bfd_size_type
) -1
5614 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5620 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5622 info
->flags
|= DF_SYMBOLIC
;
5629 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5631 if (indx
== (bfd_size_type
) -1
5632 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
5635 if (info
->new_dtags
)
5637 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
5638 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
5643 if (filter_shlib
!= NULL
)
5647 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5648 filter_shlib
, TRUE
);
5649 if (indx
== (bfd_size_type
) -1
5650 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5654 if (auxiliary_filters
!= NULL
)
5656 const char * const *p
;
5658 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5662 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5664 if (indx
== (bfd_size_type
) -1
5665 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5674 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
5676 if (indx
== (bfd_size_type
) -1
5677 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
5681 if (depaudit
!= NULL
)
5685 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
5687 if (indx
== (bfd_size_type
) -1
5688 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
5693 eif
.verdefs
= verdefs
;
5696 /* If we are supposed to export all symbols into the dynamic symbol
5697 table (this is not the normal case), then do so. */
5698 if (info
->export_dynamic
5699 || (info
->executable
&& info
->dynamic
))
5701 elf_link_hash_traverse (elf_hash_table (info
),
5702 _bfd_elf_export_symbol
,
5708 /* Make all global versions with definition. */
5709 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5710 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5711 if (!d
->symver
&& d
->literal
)
5713 const char *verstr
, *name
;
5714 size_t namelen
, verlen
, newlen
;
5716 struct elf_link_hash_entry
*newh
;
5719 namelen
= strlen (name
);
5721 verlen
= strlen (verstr
);
5722 newlen
= namelen
+ verlen
+ 3;
5724 newname
= (char *) bfd_malloc (newlen
);
5725 if (newname
== NULL
)
5727 memcpy (newname
, name
, namelen
);
5729 /* Check the hidden versioned definition. */
5730 p
= newname
+ namelen
;
5732 memcpy (p
, verstr
, verlen
+ 1);
5733 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5734 newname
, FALSE
, FALSE
,
5737 || (newh
->root
.type
!= bfd_link_hash_defined
5738 && newh
->root
.type
!= bfd_link_hash_defweak
))
5740 /* Check the default versioned definition. */
5742 memcpy (p
, verstr
, verlen
+ 1);
5743 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5744 newname
, FALSE
, FALSE
,
5749 /* Mark this version if there is a definition and it is
5750 not defined in a shared object. */
5752 && !newh
->def_dynamic
5753 && (newh
->root
.type
== bfd_link_hash_defined
5754 || newh
->root
.type
== bfd_link_hash_defweak
))
5758 /* Attach all the symbols to their version information. */
5759 asvinfo
.info
= info
;
5760 asvinfo
.verdefs
= verdefs
;
5761 asvinfo
.failed
= FALSE
;
5763 elf_link_hash_traverse (elf_hash_table (info
),
5764 _bfd_elf_link_assign_sym_version
,
5769 if (!info
->allow_undefined_version
)
5771 /* Check if all global versions have a definition. */
5773 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5774 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5775 if (d
->literal
&& !d
->symver
&& !d
->script
)
5777 (*_bfd_error_handler
)
5778 (_("%s: undefined version: %s"),
5779 d
->pattern
, t
->name
);
5780 all_defined
= FALSE
;
5785 bfd_set_error (bfd_error_bad_value
);
5790 /* Find all symbols which were defined in a dynamic object and make
5791 the backend pick a reasonable value for them. */
5792 elf_link_hash_traverse (elf_hash_table (info
),
5793 _bfd_elf_adjust_dynamic_symbol
,
5798 /* Add some entries to the .dynamic section. We fill in some of the
5799 values later, in bfd_elf_final_link, but we must add the entries
5800 now so that we know the final size of the .dynamic section. */
5802 /* If there are initialization and/or finalization functions to
5803 call then add the corresponding DT_INIT/DT_FINI entries. */
5804 h
= (info
->init_function
5805 ? elf_link_hash_lookup (elf_hash_table (info
),
5806 info
->init_function
, FALSE
,
5813 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5816 h
= (info
->fini_function
5817 ? elf_link_hash_lookup (elf_hash_table (info
),
5818 info
->fini_function
, FALSE
,
5825 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5829 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
5830 if (s
!= NULL
&& s
->linker_has_input
)
5832 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5833 if (! info
->executable
)
5838 for (sub
= info
->input_bfds
; sub
!= NULL
;
5839 sub
= sub
->link_next
)
5840 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
5841 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5842 if (elf_section_data (o
)->this_hdr
.sh_type
5843 == SHT_PREINIT_ARRAY
)
5845 (*_bfd_error_handler
)
5846 (_("%B: .preinit_array section is not allowed in DSO"),
5851 bfd_set_error (bfd_error_nonrepresentable_section
);
5855 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5856 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5859 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
5860 if (s
!= NULL
&& s
->linker_has_input
)
5862 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5863 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5866 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
5867 if (s
!= NULL
&& s
->linker_has_input
)
5869 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5870 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5874 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
5875 /* If .dynstr is excluded from the link, we don't want any of
5876 these tags. Strictly, we should be checking each section
5877 individually; This quick check covers for the case where
5878 someone does a /DISCARD/ : { *(*) }. */
5879 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5881 bfd_size_type strsize
;
5883 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5884 if ((info
->emit_hash
5885 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
5886 || (info
->emit_gnu_hash
5887 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
5888 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5889 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5890 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5891 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5892 bed
->s
->sizeof_sym
))
5897 /* The backend must work out the sizes of all the other dynamic
5899 if (bed
->elf_backend_size_dynamic_sections
5900 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5903 if (elf_hash_table (info
)->dynamic_sections_created
)
5905 unsigned long section_sym_count
;
5908 /* Set up the version definition section. */
5909 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5910 BFD_ASSERT (s
!= NULL
);
5912 /* We may have created additional version definitions if we are
5913 just linking a regular application. */
5914 verdefs
= asvinfo
.verdefs
;
5916 /* Skip anonymous version tag. */
5917 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5918 verdefs
= verdefs
->next
;
5920 if (verdefs
== NULL
&& !info
->create_default_symver
)
5921 s
->flags
|= SEC_EXCLUDE
;
5926 struct bfd_elf_version_tree
*t
;
5928 Elf_Internal_Verdef def
;
5929 Elf_Internal_Verdaux defaux
;
5930 struct bfd_link_hash_entry
*bh
;
5931 struct elf_link_hash_entry
*h
;
5937 /* Make space for the base version. */
5938 size
+= sizeof (Elf_External_Verdef
);
5939 size
+= sizeof (Elf_External_Verdaux
);
5942 /* Make space for the default version. */
5943 if (info
->create_default_symver
)
5945 size
+= sizeof (Elf_External_Verdef
);
5949 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5951 struct bfd_elf_version_deps
*n
;
5953 /* Don't emit base version twice. */
5957 size
+= sizeof (Elf_External_Verdef
);
5958 size
+= sizeof (Elf_External_Verdaux
);
5961 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5962 size
+= sizeof (Elf_External_Verdaux
);
5966 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
5967 if (s
->contents
== NULL
&& s
->size
!= 0)
5970 /* Fill in the version definition section. */
5974 def
.vd_version
= VER_DEF_CURRENT
;
5975 def
.vd_flags
= VER_FLG_BASE
;
5978 if (info
->create_default_symver
)
5980 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
5981 def
.vd_next
= sizeof (Elf_External_Verdef
);
5985 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5986 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5987 + sizeof (Elf_External_Verdaux
));
5990 if (soname_indx
!= (bfd_size_type
) -1)
5992 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5994 def
.vd_hash
= bfd_elf_hash (soname
);
5995 defaux
.vda_name
= soname_indx
;
6002 name
= lbasename (output_bfd
->filename
);
6003 def
.vd_hash
= bfd_elf_hash (name
);
6004 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6006 if (indx
== (bfd_size_type
) -1)
6008 defaux
.vda_name
= indx
;
6010 defaux
.vda_next
= 0;
6012 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6013 (Elf_External_Verdef
*) p
);
6014 p
+= sizeof (Elf_External_Verdef
);
6015 if (info
->create_default_symver
)
6017 /* Add a symbol representing this version. */
6019 if (! (_bfd_generic_link_add_one_symbol
6020 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6022 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6024 h
= (struct elf_link_hash_entry
*) bh
;
6027 h
->type
= STT_OBJECT
;
6028 h
->verinfo
.vertree
= NULL
;
6030 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6033 /* Create a duplicate of the base version with the same
6034 aux block, but different flags. */
6037 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6039 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6040 + sizeof (Elf_External_Verdaux
));
6043 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6044 (Elf_External_Verdef
*) p
);
6045 p
+= sizeof (Elf_External_Verdef
);
6047 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6048 (Elf_External_Verdaux
*) p
);
6049 p
+= sizeof (Elf_External_Verdaux
);
6051 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6054 struct bfd_elf_version_deps
*n
;
6056 /* Don't emit the base version twice. */
6061 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6064 /* Add a symbol representing this version. */
6066 if (! (_bfd_generic_link_add_one_symbol
6067 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6069 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6071 h
= (struct elf_link_hash_entry
*) bh
;
6074 h
->type
= STT_OBJECT
;
6075 h
->verinfo
.vertree
= t
;
6077 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6080 def
.vd_version
= VER_DEF_CURRENT
;
6082 if (t
->globals
.list
== NULL
6083 && t
->locals
.list
== NULL
6085 def
.vd_flags
|= VER_FLG_WEAK
;
6086 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6087 def
.vd_cnt
= cdeps
+ 1;
6088 def
.vd_hash
= bfd_elf_hash (t
->name
);
6089 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6092 /* If a basever node is next, it *must* be the last node in
6093 the chain, otherwise Verdef construction breaks. */
6094 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6095 BFD_ASSERT (t
->next
->next
== NULL
);
6097 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6098 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6099 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6101 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6102 (Elf_External_Verdef
*) p
);
6103 p
+= sizeof (Elf_External_Verdef
);
6105 defaux
.vda_name
= h
->dynstr_index
;
6106 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6108 defaux
.vda_next
= 0;
6109 if (t
->deps
!= NULL
)
6110 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6111 t
->name_indx
= defaux
.vda_name
;
6113 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6114 (Elf_External_Verdaux
*) p
);
6115 p
+= sizeof (Elf_External_Verdaux
);
6117 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6119 if (n
->version_needed
== NULL
)
6121 /* This can happen if there was an error in the
6123 defaux
.vda_name
= 0;
6127 defaux
.vda_name
= n
->version_needed
->name_indx
;
6128 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6131 if (n
->next
== NULL
)
6132 defaux
.vda_next
= 0;
6134 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6136 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6137 (Elf_External_Verdaux
*) p
);
6138 p
+= sizeof (Elf_External_Verdaux
);
6142 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
6143 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
6146 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6149 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
6151 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
6154 else if (info
->flags
& DF_BIND_NOW
)
6156 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
6162 if (info
->executable
)
6163 info
->flags_1
&= ~ (DF_1_INITFIRST
6166 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
6170 /* Work out the size of the version reference section. */
6172 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
6173 BFD_ASSERT (s
!= NULL
);
6175 struct elf_find_verdep_info sinfo
;
6178 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6179 if (sinfo
.vers
== 0)
6181 sinfo
.failed
= FALSE
;
6183 elf_link_hash_traverse (elf_hash_table (info
),
6184 _bfd_elf_link_find_version_dependencies
,
6189 if (elf_tdata (output_bfd
)->verref
== NULL
)
6190 s
->flags
|= SEC_EXCLUDE
;
6193 Elf_Internal_Verneed
*t
;
6198 /* Build the version dependency section. */
6201 for (t
= elf_tdata (output_bfd
)->verref
;
6205 Elf_Internal_Vernaux
*a
;
6207 size
+= sizeof (Elf_External_Verneed
);
6209 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6210 size
+= sizeof (Elf_External_Vernaux
);
6214 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6215 if (s
->contents
== NULL
)
6219 for (t
= elf_tdata (output_bfd
)->verref
;
6224 Elf_Internal_Vernaux
*a
;
6228 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6231 t
->vn_version
= VER_NEED_CURRENT
;
6233 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6234 elf_dt_name (t
->vn_bfd
) != NULL
6235 ? elf_dt_name (t
->vn_bfd
)
6236 : lbasename (t
->vn_bfd
->filename
),
6238 if (indx
== (bfd_size_type
) -1)
6241 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6242 if (t
->vn_nextref
== NULL
)
6245 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6246 + caux
* sizeof (Elf_External_Vernaux
));
6248 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6249 (Elf_External_Verneed
*) p
);
6250 p
+= sizeof (Elf_External_Verneed
);
6252 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6254 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6255 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6256 a
->vna_nodename
, FALSE
);
6257 if (indx
== (bfd_size_type
) -1)
6260 if (a
->vna_nextptr
== NULL
)
6263 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6265 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6266 (Elf_External_Vernaux
*) p
);
6267 p
+= sizeof (Elf_External_Vernaux
);
6271 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6272 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6275 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6279 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6280 && elf_tdata (output_bfd
)->cverdefs
== 0)
6281 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6282 §ion_sym_count
) == 0)
6284 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6285 s
->flags
|= SEC_EXCLUDE
;
6291 /* Find the first non-excluded output section. We'll use its
6292 section symbol for some emitted relocs. */
6294 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6298 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6299 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6300 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6302 elf_hash_table (info
)->text_index_section
= s
;
6307 /* Find two non-excluded output sections, one for code, one for data.
6308 We'll use their section symbols for some emitted relocs. */
6310 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6314 /* Data first, since setting text_index_section changes
6315 _bfd_elf_link_omit_section_dynsym. */
6316 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6317 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6318 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6320 elf_hash_table (info
)->data_index_section
= s
;
6324 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6325 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6326 == (SEC_ALLOC
| SEC_READONLY
))
6327 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6329 elf_hash_table (info
)->text_index_section
= s
;
6333 if (elf_hash_table (info
)->text_index_section
== NULL
)
6334 elf_hash_table (info
)->text_index_section
6335 = elf_hash_table (info
)->data_index_section
;
6339 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6341 const struct elf_backend_data
*bed
;
6343 if (!is_elf_hash_table (info
->hash
))
6346 bed
= get_elf_backend_data (output_bfd
);
6347 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6349 if (elf_hash_table (info
)->dynamic_sections_created
)
6353 bfd_size_type dynsymcount
;
6354 unsigned long section_sym_count
;
6355 unsigned int dtagcount
;
6357 dynobj
= elf_hash_table (info
)->dynobj
;
6359 /* Assign dynsym indicies. In a shared library we generate a
6360 section symbol for each output section, which come first.
6361 Next come all of the back-end allocated local dynamic syms,
6362 followed by the rest of the global symbols. */
6364 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6365 §ion_sym_count
);
6367 /* Work out the size of the symbol version section. */
6368 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6369 BFD_ASSERT (s
!= NULL
);
6370 if (dynsymcount
!= 0
6371 && (s
->flags
& SEC_EXCLUDE
) == 0)
6373 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6374 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6375 if (s
->contents
== NULL
)
6378 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6382 /* Set the size of the .dynsym and .hash sections. We counted
6383 the number of dynamic symbols in elf_link_add_object_symbols.
6384 We will build the contents of .dynsym and .hash when we build
6385 the final symbol table, because until then we do not know the
6386 correct value to give the symbols. We built the .dynstr
6387 section as we went along in elf_link_add_object_symbols. */
6388 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
6389 BFD_ASSERT (s
!= NULL
);
6390 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6392 if (dynsymcount
!= 0)
6394 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6395 if (s
->contents
== NULL
)
6398 /* The first entry in .dynsym is a dummy symbol.
6399 Clear all the section syms, in case we don't output them all. */
6400 ++section_sym_count
;
6401 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6404 elf_hash_table (info
)->bucketcount
= 0;
6406 /* Compute the size of the hashing table. As a side effect this
6407 computes the hash values for all the names we export. */
6408 if (info
->emit_hash
)
6410 unsigned long int *hashcodes
;
6411 struct hash_codes_info hashinf
;
6413 unsigned long int nsyms
;
6415 size_t hash_entry_size
;
6417 /* Compute the hash values for all exported symbols. At the same
6418 time store the values in an array so that we could use them for
6420 amt
= dynsymcount
* sizeof (unsigned long int);
6421 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
6422 if (hashcodes
== NULL
)
6424 hashinf
.hashcodes
= hashcodes
;
6425 hashinf
.error
= FALSE
;
6427 /* Put all hash values in HASHCODES. */
6428 elf_link_hash_traverse (elf_hash_table (info
),
6429 elf_collect_hash_codes
, &hashinf
);
6436 nsyms
= hashinf
.hashcodes
- hashcodes
;
6438 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6441 if (bucketcount
== 0)
6444 elf_hash_table (info
)->bucketcount
= bucketcount
;
6446 s
= bfd_get_section_by_name (dynobj
, ".hash");
6447 BFD_ASSERT (s
!= NULL
);
6448 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6449 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6450 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6451 if (s
->contents
== NULL
)
6454 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6455 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6456 s
->contents
+ hash_entry_size
);
6459 if (info
->emit_gnu_hash
)
6462 unsigned char *contents
;
6463 struct collect_gnu_hash_codes cinfo
;
6467 memset (&cinfo
, 0, sizeof (cinfo
));
6469 /* Compute the hash values for all exported symbols. At the same
6470 time store the values in an array so that we could use them for
6472 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6473 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
6474 if (cinfo
.hashcodes
== NULL
)
6477 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6478 cinfo
.min_dynindx
= -1;
6479 cinfo
.output_bfd
= output_bfd
;
6482 /* Put all hash values in HASHCODES. */
6483 elf_link_hash_traverse (elf_hash_table (info
),
6484 elf_collect_gnu_hash_codes
, &cinfo
);
6487 free (cinfo
.hashcodes
);
6492 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6494 if (bucketcount
== 0)
6496 free (cinfo
.hashcodes
);
6500 s
= bfd_get_section_by_name (dynobj
, ".gnu.hash");
6501 BFD_ASSERT (s
!= NULL
);
6503 if (cinfo
.nsyms
== 0)
6505 /* Empty .gnu.hash section is special. */
6506 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6507 free (cinfo
.hashcodes
);
6508 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6509 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6510 if (contents
== NULL
)
6512 s
->contents
= contents
;
6513 /* 1 empty bucket. */
6514 bfd_put_32 (output_bfd
, 1, contents
);
6515 /* SYMIDX above the special symbol 0. */
6516 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6517 /* Just one word for bitmask. */
6518 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6519 /* Only hash fn bloom filter. */
6520 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6521 /* No hashes are valid - empty bitmask. */
6522 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6523 /* No hashes in the only bucket. */
6524 bfd_put_32 (output_bfd
, 0,
6525 contents
+ 16 + bed
->s
->arch_size
/ 8);
6529 unsigned long int maskwords
, maskbitslog2
;
6530 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6532 maskbitslog2
= bfd_log2 (cinfo
.nsyms
) + 1;
6533 if (maskbitslog2
< 3)
6535 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6536 maskbitslog2
= maskbitslog2
+ 3;
6538 maskbitslog2
= maskbitslog2
+ 2;
6539 if (bed
->s
->arch_size
== 64)
6541 if (maskbitslog2
== 5)
6547 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6548 cinfo
.shift2
= maskbitslog2
;
6549 cinfo
.maskbits
= 1 << maskbitslog2
;
6550 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6551 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6552 amt
+= maskwords
* sizeof (bfd_vma
);
6553 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
6554 if (cinfo
.bitmask
== NULL
)
6556 free (cinfo
.hashcodes
);
6560 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
6561 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6562 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6563 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6565 /* Determine how often each hash bucket is used. */
6566 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6567 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6568 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6570 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6571 if (cinfo
.counts
[i
] != 0)
6573 cinfo
.indx
[i
] = cnt
;
6574 cnt
+= cinfo
.counts
[i
];
6576 BFD_ASSERT (cnt
== dynsymcount
);
6577 cinfo
.bucketcount
= bucketcount
;
6578 cinfo
.local_indx
= cinfo
.min_dynindx
;
6580 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6581 s
->size
+= cinfo
.maskbits
/ 8;
6582 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6583 if (contents
== NULL
)
6585 free (cinfo
.bitmask
);
6586 free (cinfo
.hashcodes
);
6590 s
->contents
= contents
;
6591 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6592 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6593 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6594 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6595 contents
+= 16 + cinfo
.maskbits
/ 8;
6597 for (i
= 0; i
< bucketcount
; ++i
)
6599 if (cinfo
.counts
[i
] == 0)
6600 bfd_put_32 (output_bfd
, 0, contents
);
6602 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6606 cinfo
.contents
= contents
;
6608 /* Renumber dynamic symbols, populate .gnu.hash section. */
6609 elf_link_hash_traverse (elf_hash_table (info
),
6610 elf_renumber_gnu_hash_syms
, &cinfo
);
6612 contents
= s
->contents
+ 16;
6613 for (i
= 0; i
< maskwords
; ++i
)
6615 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6617 contents
+= bed
->s
->arch_size
/ 8;
6620 free (cinfo
.bitmask
);
6621 free (cinfo
.hashcodes
);
6625 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
6626 BFD_ASSERT (s
!= NULL
);
6628 elf_finalize_dynstr (output_bfd
, info
);
6630 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6632 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6633 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
6640 /* Indicate that we are only retrieving symbol values from this
6644 _bfd_elf_link_just_syms (asection
*sec
, struct bfd_link_info
*info
)
6646 if (is_elf_hash_table (info
->hash
))
6647 sec
->sec_info_type
= ELF_INFO_TYPE_JUST_SYMS
;
6648 _bfd_generic_link_just_syms (sec
, info
);
6651 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6654 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
6657 BFD_ASSERT (sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
);
6658 sec
->sec_info_type
= ELF_INFO_TYPE_NONE
;
6661 /* Finish SHF_MERGE section merging. */
6664 _bfd_elf_merge_sections (bfd
*abfd
, struct bfd_link_info
*info
)
6669 if (!is_elf_hash_table (info
->hash
))
6672 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
6673 if ((ibfd
->flags
& DYNAMIC
) == 0)
6674 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6675 if ((sec
->flags
& SEC_MERGE
) != 0
6676 && !bfd_is_abs_section (sec
->output_section
))
6678 struct bfd_elf_section_data
*secdata
;
6680 secdata
= elf_section_data (sec
);
6681 if (! _bfd_add_merge_section (abfd
,
6682 &elf_hash_table (info
)->merge_info
,
6683 sec
, &secdata
->sec_info
))
6685 else if (secdata
->sec_info
)
6686 sec
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
6689 if (elf_hash_table (info
)->merge_info
!= NULL
)
6690 _bfd_merge_sections (abfd
, info
, elf_hash_table (info
)->merge_info
,
6691 merge_sections_remove_hook
);
6695 /* Create an entry in an ELF linker hash table. */
6697 struct bfd_hash_entry
*
6698 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
6699 struct bfd_hash_table
*table
,
6702 /* Allocate the structure if it has not already been allocated by a
6706 entry
= (struct bfd_hash_entry
*)
6707 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
6712 /* Call the allocation method of the superclass. */
6713 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
6716 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
6717 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
6719 /* Set local fields. */
6722 ret
->got
= htab
->init_got_refcount
;
6723 ret
->plt
= htab
->init_plt_refcount
;
6724 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
6725 - offsetof (struct elf_link_hash_entry
, size
)));
6726 /* Assume that we have been called by a non-ELF symbol reader.
6727 This flag is then reset by the code which reads an ELF input
6728 file. This ensures that a symbol created by a non-ELF symbol
6729 reader will have the flag set correctly. */
6736 /* Copy data from an indirect symbol to its direct symbol, hiding the
6737 old indirect symbol. Also used for copying flags to a weakdef. */
6740 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
6741 struct elf_link_hash_entry
*dir
,
6742 struct elf_link_hash_entry
*ind
)
6744 struct elf_link_hash_table
*htab
;
6746 /* Copy down any references that we may have already seen to the
6747 symbol which just became indirect. */
6749 dir
->ref_dynamic
|= ind
->ref_dynamic
;
6750 dir
->ref_regular
|= ind
->ref_regular
;
6751 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
6752 dir
->non_got_ref
|= ind
->non_got_ref
;
6753 dir
->needs_plt
|= ind
->needs_plt
;
6754 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
6756 if (ind
->root
.type
!= bfd_link_hash_indirect
)
6759 /* Copy over the global and procedure linkage table refcount entries.
6760 These may have been already set up by a check_relocs routine. */
6761 htab
= elf_hash_table (info
);
6762 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
6764 if (dir
->got
.refcount
< 0)
6765 dir
->got
.refcount
= 0;
6766 dir
->got
.refcount
+= ind
->got
.refcount
;
6767 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
6770 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
6772 if (dir
->plt
.refcount
< 0)
6773 dir
->plt
.refcount
= 0;
6774 dir
->plt
.refcount
+= ind
->plt
.refcount
;
6775 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
6778 if (ind
->dynindx
!= -1)
6780 if (dir
->dynindx
!= -1)
6781 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
6782 dir
->dynindx
= ind
->dynindx
;
6783 dir
->dynstr_index
= ind
->dynstr_index
;
6785 ind
->dynstr_index
= 0;
6790 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
6791 struct elf_link_hash_entry
*h
,
6792 bfd_boolean force_local
)
6794 /* STT_GNU_IFUNC symbol must go through PLT. */
6795 if (h
->type
!= STT_GNU_IFUNC
)
6797 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
6802 h
->forced_local
= 1;
6803 if (h
->dynindx
!= -1)
6806 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
6812 /* Initialize an ELF linker hash table. */
6815 _bfd_elf_link_hash_table_init
6816 (struct elf_link_hash_table
*table
,
6818 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
6819 struct bfd_hash_table
*,
6821 unsigned int entsize
,
6822 enum elf_target_id target_id
)
6825 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
6827 memset (table
, 0, sizeof * table
);
6828 table
->init_got_refcount
.refcount
= can_refcount
- 1;
6829 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
6830 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
6831 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
6832 /* The first dynamic symbol is a dummy. */
6833 table
->dynsymcount
= 1;
6835 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
6837 table
->root
.type
= bfd_link_elf_hash_table
;
6838 table
->hash_table_id
= target_id
;
6843 /* Create an ELF linker hash table. */
6845 struct bfd_link_hash_table
*
6846 _bfd_elf_link_hash_table_create (bfd
*abfd
)
6848 struct elf_link_hash_table
*ret
;
6849 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
6851 ret
= (struct elf_link_hash_table
*) bfd_malloc (amt
);
6855 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
6856 sizeof (struct elf_link_hash_entry
),
6866 /* This is a hook for the ELF emulation code in the generic linker to
6867 tell the backend linker what file name to use for the DT_NEEDED
6868 entry for a dynamic object. */
6871 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
6873 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6874 && bfd_get_format (abfd
) == bfd_object
)
6875 elf_dt_name (abfd
) = name
;
6879 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
6882 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6883 && bfd_get_format (abfd
) == bfd_object
)
6884 lib_class
= elf_dyn_lib_class (abfd
);
6891 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
6893 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6894 && bfd_get_format (abfd
) == bfd_object
)
6895 elf_dyn_lib_class (abfd
) = lib_class
;
6898 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6899 the linker ELF emulation code. */
6901 struct bfd_link_needed_list
*
6902 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6903 struct bfd_link_info
*info
)
6905 if (! is_elf_hash_table (info
->hash
))
6907 return elf_hash_table (info
)->needed
;
6910 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6911 hook for the linker ELF emulation code. */
6913 struct bfd_link_needed_list
*
6914 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6915 struct bfd_link_info
*info
)
6917 if (! is_elf_hash_table (info
->hash
))
6919 return elf_hash_table (info
)->runpath
;
6922 /* Get the name actually used for a dynamic object for a link. This
6923 is the SONAME entry if there is one. Otherwise, it is the string
6924 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6927 bfd_elf_get_dt_soname (bfd
*abfd
)
6929 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6930 && bfd_get_format (abfd
) == bfd_object
)
6931 return elf_dt_name (abfd
);
6935 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6936 the ELF linker emulation code. */
6939 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
6940 struct bfd_link_needed_list
**pneeded
)
6943 bfd_byte
*dynbuf
= NULL
;
6944 unsigned int elfsec
;
6945 unsigned long shlink
;
6946 bfd_byte
*extdyn
, *extdynend
;
6948 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
6952 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
6953 || bfd_get_format (abfd
) != bfd_object
)
6956 s
= bfd_get_section_by_name (abfd
, ".dynamic");
6957 if (s
== NULL
|| s
->size
== 0)
6960 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
6963 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
6964 if (elfsec
== SHN_BAD
)
6967 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
6969 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
6970 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
6973 extdynend
= extdyn
+ s
->size
;
6974 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
6976 Elf_Internal_Dyn dyn
;
6978 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
6980 if (dyn
.d_tag
== DT_NULL
)
6983 if (dyn
.d_tag
== DT_NEEDED
)
6986 struct bfd_link_needed_list
*l
;
6987 unsigned int tagv
= dyn
.d_un
.d_val
;
6990 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
6995 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7016 struct elf_symbuf_symbol
7018 unsigned long st_name
; /* Symbol name, index in string tbl */
7019 unsigned char st_info
; /* Type and binding attributes */
7020 unsigned char st_other
; /* Visibilty, and target specific */
7023 struct elf_symbuf_head
7025 struct elf_symbuf_symbol
*ssym
;
7026 bfd_size_type count
;
7027 unsigned int st_shndx
;
7034 Elf_Internal_Sym
*isym
;
7035 struct elf_symbuf_symbol
*ssym
;
7040 /* Sort references to symbols by ascending section number. */
7043 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
7045 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
7046 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
7048 return s1
->st_shndx
- s2
->st_shndx
;
7052 elf_sym_name_compare (const void *arg1
, const void *arg2
)
7054 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
7055 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
7056 return strcmp (s1
->name
, s2
->name
);
7059 static struct elf_symbuf_head
*
7060 elf_create_symbuf (bfd_size_type symcount
, Elf_Internal_Sym
*isymbuf
)
7062 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
7063 struct elf_symbuf_symbol
*ssym
;
7064 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
7065 bfd_size_type i
, shndx_count
, total_size
;
7067 indbuf
= (Elf_Internal_Sym
**) bfd_malloc2 (symcount
, sizeof (*indbuf
));
7071 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
7072 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
7073 *ind
++ = &isymbuf
[i
];
7076 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
7077 elf_sort_elf_symbol
);
7080 if (indbufend
> indbuf
)
7081 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
7082 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
7085 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
7086 + (indbufend
- indbuf
) * sizeof (*ssym
));
7087 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
7088 if (ssymbuf
== NULL
)
7094 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
7095 ssymbuf
->ssym
= NULL
;
7096 ssymbuf
->count
= shndx_count
;
7097 ssymbuf
->st_shndx
= 0;
7098 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
7100 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
7103 ssymhead
->ssym
= ssym
;
7104 ssymhead
->count
= 0;
7105 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
7107 ssym
->st_name
= (*ind
)->st_name
;
7108 ssym
->st_info
= (*ind
)->st_info
;
7109 ssym
->st_other
= (*ind
)->st_other
;
7112 BFD_ASSERT ((bfd_size_type
) (ssymhead
- ssymbuf
) == shndx_count
7113 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
7120 /* Check if 2 sections define the same set of local and global
7124 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
7125 struct bfd_link_info
*info
)
7128 const struct elf_backend_data
*bed1
, *bed2
;
7129 Elf_Internal_Shdr
*hdr1
, *hdr2
;
7130 bfd_size_type symcount1
, symcount2
;
7131 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
7132 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
7133 Elf_Internal_Sym
*isym
, *isymend
;
7134 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
7135 bfd_size_type count1
, count2
, i
;
7136 unsigned int shndx1
, shndx2
;
7142 /* Both sections have to be in ELF. */
7143 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
7144 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
7147 if (elf_section_type (sec1
) != elf_section_type (sec2
))
7150 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
7151 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
7152 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
7155 bed1
= get_elf_backend_data (bfd1
);
7156 bed2
= get_elf_backend_data (bfd2
);
7157 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
7158 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
7159 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
7160 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
7162 if (symcount1
== 0 || symcount2
== 0)
7168 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
7169 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
7171 if (ssymbuf1
== NULL
)
7173 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
7175 if (isymbuf1
== NULL
)
7178 if (!info
->reduce_memory_overheads
)
7179 elf_tdata (bfd1
)->symbuf
= ssymbuf1
7180 = elf_create_symbuf (symcount1
, isymbuf1
);
7183 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
7185 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
7187 if (isymbuf2
== NULL
)
7190 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
7191 elf_tdata (bfd2
)->symbuf
= ssymbuf2
7192 = elf_create_symbuf (symcount2
, isymbuf2
);
7195 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7197 /* Optimized faster version. */
7198 bfd_size_type lo
, hi
, mid
;
7199 struct elf_symbol
*symp
;
7200 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7203 hi
= ssymbuf1
->count
;
7208 mid
= (lo
+ hi
) / 2;
7209 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7211 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7215 count1
= ssymbuf1
[mid
].count
;
7222 hi
= ssymbuf2
->count
;
7227 mid
= (lo
+ hi
) / 2;
7228 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7230 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7234 count2
= ssymbuf2
[mid
].count
;
7240 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7243 symtable1
= (struct elf_symbol
*)
7244 bfd_malloc (count1
* sizeof (struct elf_symbol
));
7245 symtable2
= (struct elf_symbol
*)
7246 bfd_malloc (count2
* sizeof (struct elf_symbol
));
7247 if (symtable1
== NULL
|| symtable2
== NULL
)
7251 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7252 ssym
< ssymend
; ssym
++, symp
++)
7254 symp
->u
.ssym
= ssym
;
7255 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7261 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7262 ssym
< ssymend
; ssym
++, symp
++)
7264 symp
->u
.ssym
= ssym
;
7265 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7270 /* Sort symbol by name. */
7271 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7272 elf_sym_name_compare
);
7273 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7274 elf_sym_name_compare
);
7276 for (i
= 0; i
< count1
; i
++)
7277 /* Two symbols must have the same binding, type and name. */
7278 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7279 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7280 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7287 symtable1
= (struct elf_symbol
*)
7288 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7289 symtable2
= (struct elf_symbol
*)
7290 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7291 if (symtable1
== NULL
|| symtable2
== NULL
)
7294 /* Count definitions in the section. */
7296 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7297 if (isym
->st_shndx
== shndx1
)
7298 symtable1
[count1
++].u
.isym
= isym
;
7301 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7302 if (isym
->st_shndx
== shndx2
)
7303 symtable2
[count2
++].u
.isym
= isym
;
7305 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7308 for (i
= 0; i
< count1
; i
++)
7310 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7311 symtable1
[i
].u
.isym
->st_name
);
7313 for (i
= 0; i
< count2
; i
++)
7315 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7316 symtable2
[i
].u
.isym
->st_name
);
7318 /* Sort symbol by name. */
7319 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7320 elf_sym_name_compare
);
7321 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7322 elf_sym_name_compare
);
7324 for (i
= 0; i
< count1
; i
++)
7325 /* Two symbols must have the same binding, type and name. */
7326 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7327 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7328 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7346 /* Return TRUE if 2 section types are compatible. */
7349 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7350 bfd
*bbfd
, const asection
*bsec
)
7354 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7355 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7358 return elf_section_type (asec
) == elf_section_type (bsec
);
7361 /* Final phase of ELF linker. */
7363 /* A structure we use to avoid passing large numbers of arguments. */
7365 struct elf_final_link_info
7367 /* General link information. */
7368 struct bfd_link_info
*info
;
7371 /* Symbol string table. */
7372 struct bfd_strtab_hash
*symstrtab
;
7373 /* .dynsym section. */
7374 asection
*dynsym_sec
;
7375 /* .hash section. */
7377 /* symbol version section (.gnu.version). */
7378 asection
*symver_sec
;
7379 /* Buffer large enough to hold contents of any section. */
7381 /* Buffer large enough to hold external relocs of any section. */
7382 void *external_relocs
;
7383 /* Buffer large enough to hold internal relocs of any section. */
7384 Elf_Internal_Rela
*internal_relocs
;
7385 /* Buffer large enough to hold external local symbols of any input
7387 bfd_byte
*external_syms
;
7388 /* And a buffer for symbol section indices. */
7389 Elf_External_Sym_Shndx
*locsym_shndx
;
7390 /* Buffer large enough to hold internal local symbols of any input
7392 Elf_Internal_Sym
*internal_syms
;
7393 /* Array large enough to hold a symbol index for each local symbol
7394 of any input BFD. */
7396 /* Array large enough to hold a section pointer for each local
7397 symbol of any input BFD. */
7398 asection
**sections
;
7399 /* Buffer to hold swapped out symbols. */
7401 /* And one for symbol section indices. */
7402 Elf_External_Sym_Shndx
*symshndxbuf
;
7403 /* Number of swapped out symbols in buffer. */
7404 size_t symbuf_count
;
7405 /* Number of symbols which fit in symbuf. */
7407 /* And same for symshndxbuf. */
7408 size_t shndxbuf_size
;
7411 /* This struct is used to pass information to elf_link_output_extsym. */
7413 struct elf_outext_info
7416 bfd_boolean localsyms
;
7417 struct elf_final_link_info
*finfo
;
7421 /* Support for evaluating a complex relocation.
7423 Complex relocations are generalized, self-describing relocations. The
7424 implementation of them consists of two parts: complex symbols, and the
7425 relocations themselves.
7427 The relocations are use a reserved elf-wide relocation type code (R_RELC
7428 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7429 information (start bit, end bit, word width, etc) into the addend. This
7430 information is extracted from CGEN-generated operand tables within gas.
7432 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7433 internal) representing prefix-notation expressions, including but not
7434 limited to those sorts of expressions normally encoded as addends in the
7435 addend field. The symbol mangling format is:
7438 | <unary-operator> ':' <node>
7439 | <binary-operator> ':' <node> ':' <node>
7442 <literal> := 's' <digits=N> ':' <N character symbol name>
7443 | 'S' <digits=N> ':' <N character section name>
7447 <binary-operator> := as in C
7448 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7451 set_symbol_value (bfd
*bfd_with_globals
,
7452 Elf_Internal_Sym
*isymbuf
,
7457 struct elf_link_hash_entry
**sym_hashes
;
7458 struct elf_link_hash_entry
*h
;
7459 size_t extsymoff
= locsymcount
;
7461 if (symidx
< locsymcount
)
7463 Elf_Internal_Sym
*sym
;
7465 sym
= isymbuf
+ symidx
;
7466 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7468 /* It is a local symbol: move it to the
7469 "absolute" section and give it a value. */
7470 sym
->st_shndx
= SHN_ABS
;
7471 sym
->st_value
= val
;
7474 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7478 /* It is a global symbol: set its link type
7479 to "defined" and give it a value. */
7481 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7482 h
= sym_hashes
[symidx
- extsymoff
];
7483 while (h
->root
.type
== bfd_link_hash_indirect
7484 || h
->root
.type
== bfd_link_hash_warning
)
7485 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7486 h
->root
.type
= bfd_link_hash_defined
;
7487 h
->root
.u
.def
.value
= val
;
7488 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7492 resolve_symbol (const char *name
,
7494 struct elf_final_link_info
*finfo
,
7496 Elf_Internal_Sym
*isymbuf
,
7499 Elf_Internal_Sym
*sym
;
7500 struct bfd_link_hash_entry
*global_entry
;
7501 const char *candidate
= NULL
;
7502 Elf_Internal_Shdr
*symtab_hdr
;
7505 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7507 for (i
= 0; i
< locsymcount
; ++ i
)
7511 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7514 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7515 symtab_hdr
->sh_link
,
7518 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7519 name
, candidate
, (unsigned long) sym
->st_value
);
7521 if (candidate
&& strcmp (candidate
, name
) == 0)
7523 asection
*sec
= finfo
->sections
[i
];
7525 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7526 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7528 printf ("Found symbol with value %8.8lx\n",
7529 (unsigned long) *result
);
7535 /* Hmm, haven't found it yet. perhaps it is a global. */
7536 global_entry
= bfd_link_hash_lookup (finfo
->info
->hash
, name
,
7537 FALSE
, FALSE
, TRUE
);
7541 if (global_entry
->type
== bfd_link_hash_defined
7542 || global_entry
->type
== bfd_link_hash_defweak
)
7544 *result
= (global_entry
->u
.def
.value
7545 + global_entry
->u
.def
.section
->output_section
->vma
7546 + global_entry
->u
.def
.section
->output_offset
);
7548 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7549 global_entry
->root
.string
, (unsigned long) *result
);
7558 resolve_section (const char *name
,
7565 for (curr
= sections
; curr
; curr
= curr
->next
)
7566 if (strcmp (curr
->name
, name
) == 0)
7568 *result
= curr
->vma
;
7572 /* Hmm. still haven't found it. try pseudo-section names. */
7573 for (curr
= sections
; curr
; curr
= curr
->next
)
7575 len
= strlen (curr
->name
);
7576 if (len
> strlen (name
))
7579 if (strncmp (curr
->name
, name
, len
) == 0)
7581 if (strncmp (".end", name
+ len
, 4) == 0)
7583 *result
= curr
->vma
+ curr
->size
;
7587 /* Insert more pseudo-section names here, if you like. */
7595 undefined_reference (const char *reftype
, const char *name
)
7597 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7602 eval_symbol (bfd_vma
*result
,
7605 struct elf_final_link_info
*finfo
,
7607 Elf_Internal_Sym
*isymbuf
,
7616 const char *sym
= *symp
;
7618 bfd_boolean symbol_is_section
= FALSE
;
7623 if (len
< 1 || len
> sizeof (symbuf
))
7625 bfd_set_error (bfd_error_invalid_operation
);
7638 *result
= strtoul (sym
, (char **) symp
, 16);
7642 symbol_is_section
= TRUE
;
7645 symlen
= strtol (sym
, (char **) symp
, 10);
7646 sym
= *symp
+ 1; /* Skip the trailing ':'. */
7648 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
7650 bfd_set_error (bfd_error_invalid_operation
);
7654 memcpy (symbuf
, sym
, symlen
);
7655 symbuf
[symlen
] = '\0';
7656 *symp
= sym
+ symlen
;
7658 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7659 the symbol as a section, or vice-versa. so we're pretty liberal in our
7660 interpretation here; section means "try section first", not "must be a
7661 section", and likewise with symbol. */
7663 if (symbol_is_section
)
7665 if (!resolve_section (symbuf
, finfo
->output_bfd
->sections
, result
)
7666 && !resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7667 isymbuf
, locsymcount
))
7669 undefined_reference ("section", symbuf
);
7675 if (!resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7676 isymbuf
, locsymcount
)
7677 && !resolve_section (symbuf
, finfo
->output_bfd
->sections
,
7680 undefined_reference ("symbol", symbuf
);
7687 /* All that remains are operators. */
7689 #define UNARY_OP(op) \
7690 if (strncmp (sym, #op, strlen (#op)) == 0) \
7692 sym += strlen (#op); \
7696 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7697 isymbuf, locsymcount, signed_p)) \
7700 *result = op ((bfd_signed_vma) a); \
7706 #define BINARY_OP(op) \
7707 if (strncmp (sym, #op, strlen (#op)) == 0) \
7709 sym += strlen (#op); \
7713 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7714 isymbuf, locsymcount, signed_p)) \
7717 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7718 isymbuf, locsymcount, signed_p)) \
7721 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7751 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
7752 bfd_set_error (bfd_error_invalid_operation
);
7758 put_value (bfd_vma size
,
7759 unsigned long chunksz
,
7764 location
+= (size
- chunksz
);
7766 for (; size
; size
-= chunksz
, location
-= chunksz
, x
>>= (chunksz
* 8))
7774 bfd_put_8 (input_bfd
, x
, location
);
7777 bfd_put_16 (input_bfd
, x
, location
);
7780 bfd_put_32 (input_bfd
, x
, location
);
7784 bfd_put_64 (input_bfd
, x
, location
);
7794 get_value (bfd_vma size
,
7795 unsigned long chunksz
,
7801 for (; size
; size
-= chunksz
, location
+= chunksz
)
7809 x
= (x
<< (8 * chunksz
)) | bfd_get_8 (input_bfd
, location
);
7812 x
= (x
<< (8 * chunksz
)) | bfd_get_16 (input_bfd
, location
);
7815 x
= (x
<< (8 * chunksz
)) | bfd_get_32 (input_bfd
, location
);
7819 x
= (x
<< (8 * chunksz
)) | bfd_get_64 (input_bfd
, location
);
7830 decode_complex_addend (unsigned long *start
, /* in bits */
7831 unsigned long *oplen
, /* in bits */
7832 unsigned long *len
, /* in bits */
7833 unsigned long *wordsz
, /* in bytes */
7834 unsigned long *chunksz
, /* in bytes */
7835 unsigned long *lsb0_p
,
7836 unsigned long *signed_p
,
7837 unsigned long *trunc_p
,
7838 unsigned long encoded
)
7840 * start
= encoded
& 0x3F;
7841 * len
= (encoded
>> 6) & 0x3F;
7842 * oplen
= (encoded
>> 12) & 0x3F;
7843 * wordsz
= (encoded
>> 18) & 0xF;
7844 * chunksz
= (encoded
>> 22) & 0xF;
7845 * lsb0_p
= (encoded
>> 27) & 1;
7846 * signed_p
= (encoded
>> 28) & 1;
7847 * trunc_p
= (encoded
>> 29) & 1;
7850 bfd_reloc_status_type
7851 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
7852 asection
*input_section ATTRIBUTE_UNUSED
,
7854 Elf_Internal_Rela
*rel
,
7857 bfd_vma shift
, x
, mask
;
7858 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
7859 bfd_reloc_status_type r
;
7861 /* Perform this reloc, since it is complex.
7862 (this is not to say that it necessarily refers to a complex
7863 symbol; merely that it is a self-describing CGEN based reloc.
7864 i.e. the addend has the complete reloc information (bit start, end,
7865 word size, etc) encoded within it.). */
7867 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
7868 &chunksz
, &lsb0_p
, &signed_p
,
7869 &trunc_p
, rel
->r_addend
);
7871 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
7874 shift
= (start
+ 1) - len
;
7876 shift
= (8 * wordsz
) - (start
+ len
);
7878 /* FIXME: octets_per_byte. */
7879 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ rel
->r_offset
);
7882 printf ("Doing complex reloc: "
7883 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7884 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7885 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7886 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
7887 oplen
, (unsigned long) x
, (unsigned long) mask
,
7888 (unsigned long) relocation
);
7893 /* Now do an overflow check. */
7894 r
= bfd_check_overflow ((signed_p
7895 ? complain_overflow_signed
7896 : complain_overflow_unsigned
),
7897 len
, 0, (8 * wordsz
),
7901 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
7904 printf (" relocation: %8.8lx\n"
7905 " shifted mask: %8.8lx\n"
7906 " shifted/masked reloc: %8.8lx\n"
7907 " result: %8.8lx\n",
7908 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
7909 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
7911 /* FIXME: octets_per_byte. */
7912 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ rel
->r_offset
);
7916 /* When performing a relocatable link, the input relocations are
7917 preserved. But, if they reference global symbols, the indices
7918 referenced must be updated. Update all the relocations found in
7922 elf_link_adjust_relocs (bfd
*abfd
,
7923 struct bfd_elf_section_reloc_data
*reldata
)
7926 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7928 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7929 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7930 bfd_vma r_type_mask
;
7932 unsigned int count
= reldata
->count
;
7933 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
7935 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
7937 swap_in
= bed
->s
->swap_reloc_in
;
7938 swap_out
= bed
->s
->swap_reloc_out
;
7940 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
7942 swap_in
= bed
->s
->swap_reloca_in
;
7943 swap_out
= bed
->s
->swap_reloca_out
;
7948 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
7951 if (bed
->s
->arch_size
== 32)
7958 r_type_mask
= 0xffffffff;
7962 erela
= reldata
->hdr
->contents
;
7963 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
7965 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
7968 if (*rel_hash
== NULL
)
7971 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
7973 (*swap_in
) (abfd
, erela
, irela
);
7974 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
7975 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
7976 | (irela
[j
].r_info
& r_type_mask
));
7977 (*swap_out
) (abfd
, irela
, erela
);
7981 struct elf_link_sort_rela
7987 enum elf_reloc_type_class type
;
7988 /* We use this as an array of size int_rels_per_ext_rel. */
7989 Elf_Internal_Rela rela
[1];
7993 elf_link_sort_cmp1 (const void *A
, const void *B
)
7995 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
7996 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
7997 int relativea
, relativeb
;
7999 relativea
= a
->type
== reloc_class_relative
;
8000 relativeb
= b
->type
== reloc_class_relative
;
8002 if (relativea
< relativeb
)
8004 if (relativea
> relativeb
)
8006 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
8008 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
8010 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8012 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8018 elf_link_sort_cmp2 (const void *A
, const void *B
)
8020 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
8021 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8024 if (a
->u
.offset
< b
->u
.offset
)
8026 if (a
->u
.offset
> b
->u
.offset
)
8028 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
8029 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
8034 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8036 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8042 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
8044 asection
*dynamic_relocs
;
8047 bfd_size_type count
, size
;
8048 size_t i
, ret
, sort_elt
, ext_size
;
8049 bfd_byte
*sort
, *s_non_relative
, *p
;
8050 struct elf_link_sort_rela
*sq
;
8051 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8052 int i2e
= bed
->s
->int_rels_per_ext_rel
;
8053 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8054 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8055 struct bfd_link_order
*lo
;
8057 bfd_boolean use_rela
;
8059 /* Find a dynamic reloc section. */
8060 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
8061 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
8062 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
8063 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8065 bfd_boolean use_rela_initialised
= FALSE
;
8067 /* This is just here to stop gcc from complaining.
8068 It's initialization checking code is not perfect. */
8071 /* Both sections are present. Examine the sizes
8072 of the indirect sections to help us choose. */
8073 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8074 if (lo
->type
== bfd_indirect_link_order
)
8076 asection
*o
= lo
->u
.indirect
.section
;
8078 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8080 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8081 /* Section size is divisible by both rel and rela sizes.
8082 It is of no help to us. */
8086 /* Section size is only divisible by rela. */
8087 if (use_rela_initialised
&& (use_rela
== FALSE
))
8090 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8091 bfd_set_error (bfd_error_invalid_operation
);
8097 use_rela_initialised
= TRUE
;
8101 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8103 /* Section size is only divisible by rel. */
8104 if (use_rela_initialised
&& (use_rela
== TRUE
))
8107 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8108 bfd_set_error (bfd_error_invalid_operation
);
8114 use_rela_initialised
= TRUE
;
8119 /* The section size is not divisible by either - something is wrong. */
8121 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8122 bfd_set_error (bfd_error_invalid_operation
);
8127 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8128 if (lo
->type
== bfd_indirect_link_order
)
8130 asection
*o
= lo
->u
.indirect
.section
;
8132 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8134 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8135 /* Section size is divisible by both rel and rela sizes.
8136 It is of no help to us. */
8140 /* Section size is only divisible by rela. */
8141 if (use_rela_initialised
&& (use_rela
== FALSE
))
8144 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8145 bfd_set_error (bfd_error_invalid_operation
);
8151 use_rela_initialised
= TRUE
;
8155 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8157 /* Section size is only divisible by rel. */
8158 if (use_rela_initialised
&& (use_rela
== TRUE
))
8161 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8162 bfd_set_error (bfd_error_invalid_operation
);
8168 use_rela_initialised
= TRUE
;
8173 /* The section size is not divisible by either - something is wrong. */
8175 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8176 bfd_set_error (bfd_error_invalid_operation
);
8181 if (! use_rela_initialised
)
8185 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
8187 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8194 dynamic_relocs
= rela_dyn
;
8195 ext_size
= bed
->s
->sizeof_rela
;
8196 swap_in
= bed
->s
->swap_reloca_in
;
8197 swap_out
= bed
->s
->swap_reloca_out
;
8201 dynamic_relocs
= rel_dyn
;
8202 ext_size
= bed
->s
->sizeof_rel
;
8203 swap_in
= bed
->s
->swap_reloc_in
;
8204 swap_out
= bed
->s
->swap_reloc_out
;
8208 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8209 if (lo
->type
== bfd_indirect_link_order
)
8210 size
+= lo
->u
.indirect
.section
->size
;
8212 if (size
!= dynamic_relocs
->size
)
8215 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8216 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8218 count
= dynamic_relocs
->size
/ ext_size
;
8221 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
8225 (*info
->callbacks
->warning
)
8226 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8230 if (bed
->s
->arch_size
== 32)
8231 r_sym_mask
= ~(bfd_vma
) 0xff;
8233 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8235 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8236 if (lo
->type
== bfd_indirect_link_order
)
8238 bfd_byte
*erel
, *erelend
;
8239 asection
*o
= lo
->u
.indirect
.section
;
8241 if (o
->contents
== NULL
&& o
->size
!= 0)
8243 /* This is a reloc section that is being handled as a normal
8244 section. See bfd_section_from_shdr. We can't combine
8245 relocs in this case. */
8250 erelend
= o
->contents
+ o
->size
;
8251 /* FIXME: octets_per_byte. */
8252 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8254 while (erel
< erelend
)
8256 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8258 (*swap_in
) (abfd
, erel
, s
->rela
);
8259 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
8260 s
->u
.sym_mask
= r_sym_mask
;
8266 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8268 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8270 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8271 if (s
->type
!= reloc_class_relative
)
8277 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8278 for (; i
< count
; i
++, p
+= sort_elt
)
8280 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8281 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8283 sp
->u
.offset
= sq
->rela
->r_offset
;
8286 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8288 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8289 if (lo
->type
== bfd_indirect_link_order
)
8291 bfd_byte
*erel
, *erelend
;
8292 asection
*o
= lo
->u
.indirect
.section
;
8295 erelend
= o
->contents
+ o
->size
;
8296 /* FIXME: octets_per_byte. */
8297 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8298 while (erel
< erelend
)
8300 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8301 (*swap_out
) (abfd
, s
->rela
, erel
);
8308 *psec
= dynamic_relocs
;
8312 /* Flush the output symbols to the file. */
8315 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
8316 const struct elf_backend_data
*bed
)
8318 if (finfo
->symbuf_count
> 0)
8320 Elf_Internal_Shdr
*hdr
;
8324 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
8325 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
8326 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8327 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
8328 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
8331 hdr
->sh_size
+= amt
;
8332 finfo
->symbuf_count
= 0;
8338 /* Add a symbol to the output symbol table. */
8341 elf_link_output_sym (struct elf_final_link_info
*finfo
,
8343 Elf_Internal_Sym
*elfsym
,
8344 asection
*input_sec
,
8345 struct elf_link_hash_entry
*h
)
8348 Elf_External_Sym_Shndx
*destshndx
;
8349 int (*output_symbol_hook
)
8350 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8351 struct elf_link_hash_entry
*);
8352 const struct elf_backend_data
*bed
;
8354 bed
= get_elf_backend_data (finfo
->output_bfd
);
8355 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8356 if (output_symbol_hook
!= NULL
)
8358 int ret
= (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
);
8363 if (name
== NULL
|| *name
== '\0')
8364 elfsym
->st_name
= 0;
8365 else if (input_sec
->flags
& SEC_EXCLUDE
)
8366 elfsym
->st_name
= 0;
8369 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
8371 if (elfsym
->st_name
== (unsigned long) -1)
8375 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
8377 if (! elf_link_flush_output_syms (finfo
, bed
))
8381 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8382 destshndx
= finfo
->symshndxbuf
;
8383 if (destshndx
!= NULL
)
8385 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
8389 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
8390 destshndx
= (Elf_External_Sym_Shndx
*) bfd_realloc (destshndx
,
8392 if (destshndx
== NULL
)
8394 finfo
->symshndxbuf
= destshndx
;
8395 memset ((char *) destshndx
+ amt
, 0, amt
);
8396 finfo
->shndxbuf_size
*= 2;
8398 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
8401 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
8402 finfo
->symbuf_count
+= 1;
8403 bfd_get_symcount (finfo
->output_bfd
) += 1;
8408 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8411 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
8413 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
8414 && sym
->st_shndx
< SHN_LORESERVE
)
8416 /* The gABI doesn't support dynamic symbols in output sections
8418 (*_bfd_error_handler
)
8419 (_("%B: Too many sections: %d (>= %d)"),
8420 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
8421 bfd_set_error (bfd_error_nonrepresentable_section
);
8427 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8428 allowing an unsatisfied unversioned symbol in the DSO to match a
8429 versioned symbol that would normally require an explicit version.
8430 We also handle the case that a DSO references a hidden symbol
8431 which may be satisfied by a versioned symbol in another DSO. */
8434 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
8435 const struct elf_backend_data
*bed
,
8436 struct elf_link_hash_entry
*h
)
8439 struct elf_link_loaded_list
*loaded
;
8441 if (!is_elf_hash_table (info
->hash
))
8444 switch (h
->root
.type
)
8450 case bfd_link_hash_undefined
:
8451 case bfd_link_hash_undefweak
:
8452 abfd
= h
->root
.u
.undef
.abfd
;
8453 if ((abfd
->flags
& DYNAMIC
) == 0
8454 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
8458 case bfd_link_hash_defined
:
8459 case bfd_link_hash_defweak
:
8460 abfd
= h
->root
.u
.def
.section
->owner
;
8463 case bfd_link_hash_common
:
8464 abfd
= h
->root
.u
.c
.p
->section
->owner
;
8467 BFD_ASSERT (abfd
!= NULL
);
8469 for (loaded
= elf_hash_table (info
)->loaded
;
8471 loaded
= loaded
->next
)
8474 Elf_Internal_Shdr
*hdr
;
8475 bfd_size_type symcount
;
8476 bfd_size_type extsymcount
;
8477 bfd_size_type extsymoff
;
8478 Elf_Internal_Shdr
*versymhdr
;
8479 Elf_Internal_Sym
*isym
;
8480 Elf_Internal_Sym
*isymend
;
8481 Elf_Internal_Sym
*isymbuf
;
8482 Elf_External_Versym
*ever
;
8483 Elf_External_Versym
*extversym
;
8485 input
= loaded
->abfd
;
8487 /* We check each DSO for a possible hidden versioned definition. */
8489 || (input
->flags
& DYNAMIC
) == 0
8490 || elf_dynversym (input
) == 0)
8493 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
8495 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8496 if (elf_bad_symtab (input
))
8498 extsymcount
= symcount
;
8503 extsymcount
= symcount
- hdr
->sh_info
;
8504 extsymoff
= hdr
->sh_info
;
8507 if (extsymcount
== 0)
8510 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
8512 if (isymbuf
== NULL
)
8515 /* Read in any version definitions. */
8516 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
8517 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
8518 if (extversym
== NULL
)
8521 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
8522 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
8523 != versymhdr
->sh_size
))
8531 ever
= extversym
+ extsymoff
;
8532 isymend
= isymbuf
+ extsymcount
;
8533 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
8536 Elf_Internal_Versym iver
;
8537 unsigned short version_index
;
8539 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
8540 || isym
->st_shndx
== SHN_UNDEF
)
8543 name
= bfd_elf_string_from_elf_section (input
,
8546 if (strcmp (name
, h
->root
.root
.string
) != 0)
8549 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
8551 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
8553 && h
->forced_local
))
8555 /* If we have a non-hidden versioned sym, then it should
8556 have provided a definition for the undefined sym unless
8557 it is defined in a non-shared object and forced local.
8562 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
8563 if (version_index
== 1 || version_index
== 2)
8565 /* This is the base or first version. We can use it. */
8579 /* Add an external symbol to the symbol table. This is called from
8580 the hash table traversal routine. When generating a shared object,
8581 we go through the symbol table twice. The first time we output
8582 anything that might have been forced to local scope in a version
8583 script. The second time we output the symbols that are still
8587 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
8589 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
8590 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
8592 Elf_Internal_Sym sym
;
8593 asection
*input_sec
;
8594 const struct elf_backend_data
*bed
;
8598 if (h
->root
.type
== bfd_link_hash_warning
)
8600 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8601 if (h
->root
.type
== bfd_link_hash_new
)
8605 /* Decide whether to output this symbol in this pass. */
8606 if (eoinfo
->localsyms
)
8608 if (!h
->forced_local
)
8613 if (h
->forced_local
)
8617 bed
= get_elf_backend_data (finfo
->output_bfd
);
8619 if (h
->root
.type
== bfd_link_hash_undefined
)
8621 /* If we have an undefined symbol reference here then it must have
8622 come from a shared library that is being linked in. (Undefined
8623 references in regular files have already been handled unless
8624 they are in unreferenced sections which are removed by garbage
8626 bfd_boolean ignore_undef
= FALSE
;
8628 /* Some symbols may be special in that the fact that they're
8629 undefined can be safely ignored - let backend determine that. */
8630 if (bed
->elf_backend_ignore_undef_symbol
)
8631 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
8633 /* If we are reporting errors for this situation then do so now. */
8636 && (!h
->ref_regular
|| finfo
->info
->gc_sections
)
8637 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
8638 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
8640 if (! (finfo
->info
->callbacks
->undefined_symbol
8641 (finfo
->info
, h
->root
.root
.string
,
8642 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
,
8643 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
8645 eoinfo
->failed
= TRUE
;
8651 /* We should also warn if a forced local symbol is referenced from
8652 shared libraries. */
8653 if (! finfo
->info
->relocatable
8654 && (! finfo
->info
->shared
)
8659 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
8661 (*_bfd_error_handler
)
8662 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
8664 h
->root
.u
.def
.section
== bfd_abs_section_ptr
8665 ? finfo
->output_bfd
: h
->root
.u
.def
.section
->owner
,
8666 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
8668 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
8669 ? "hidden" : "local",
8670 h
->root
.root
.string
);
8671 eoinfo
->failed
= TRUE
;
8675 /* We don't want to output symbols that have never been mentioned by
8676 a regular file, or that we have been told to strip. However, if
8677 h->indx is set to -2, the symbol is used by a reloc and we must
8681 else if ((h
->def_dynamic
8683 || h
->root
.type
== bfd_link_hash_new
)
8687 else if (finfo
->info
->strip
== strip_all
)
8689 else if (finfo
->info
->strip
== strip_some
8690 && bfd_hash_lookup (finfo
->info
->keep_hash
,
8691 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
8693 else if (finfo
->info
->strip_discarded
8694 && (h
->root
.type
== bfd_link_hash_defined
8695 || h
->root
.type
== bfd_link_hash_defweak
)
8696 && elf_discarded_section (h
->root
.u
.def
.section
))
8701 /* If we're stripping it, and it's not a dynamic symbol, there's
8702 nothing else to do unless it is a forced local symbol or a
8703 STT_GNU_IFUNC symbol. */
8706 && h
->type
!= STT_GNU_IFUNC
8707 && !h
->forced_local
)
8711 sym
.st_size
= h
->size
;
8712 sym
.st_other
= h
->other
;
8713 if (h
->forced_local
)
8715 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
8716 /* Turn off visibility on local symbol. */
8717 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
8719 else if (h
->unique_global
)
8720 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, h
->type
);
8721 else if (h
->root
.type
== bfd_link_hash_undefweak
8722 || h
->root
.type
== bfd_link_hash_defweak
)
8723 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
8725 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
8727 switch (h
->root
.type
)
8730 case bfd_link_hash_new
:
8731 case bfd_link_hash_warning
:
8735 case bfd_link_hash_undefined
:
8736 case bfd_link_hash_undefweak
:
8737 input_sec
= bfd_und_section_ptr
;
8738 sym
.st_shndx
= SHN_UNDEF
;
8741 case bfd_link_hash_defined
:
8742 case bfd_link_hash_defweak
:
8744 input_sec
= h
->root
.u
.def
.section
;
8745 if (input_sec
->output_section
!= NULL
)
8748 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
8749 input_sec
->output_section
);
8750 if (sym
.st_shndx
== SHN_BAD
)
8752 (*_bfd_error_handler
)
8753 (_("%B: could not find output section %A for input section %A"),
8754 finfo
->output_bfd
, input_sec
->output_section
, input_sec
);
8755 eoinfo
->failed
= TRUE
;
8759 /* ELF symbols in relocatable files are section relative,
8760 but in nonrelocatable files they are virtual
8762 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
8763 if (! finfo
->info
->relocatable
)
8765 sym
.st_value
+= input_sec
->output_section
->vma
;
8766 if (h
->type
== STT_TLS
)
8768 asection
*tls_sec
= elf_hash_table (finfo
->info
)->tls_sec
;
8769 if (tls_sec
!= NULL
)
8770 sym
.st_value
-= tls_sec
->vma
;
8773 /* The TLS section may have been garbage collected. */
8774 BFD_ASSERT (finfo
->info
->gc_sections
8775 && !input_sec
->gc_mark
);
8782 BFD_ASSERT (input_sec
->owner
== NULL
8783 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
8784 sym
.st_shndx
= SHN_UNDEF
;
8785 input_sec
= bfd_und_section_ptr
;
8790 case bfd_link_hash_common
:
8791 input_sec
= h
->root
.u
.c
.p
->section
;
8792 sym
.st_shndx
= bed
->common_section_index (input_sec
);
8793 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
8796 case bfd_link_hash_indirect
:
8797 /* These symbols are created by symbol versioning. They point
8798 to the decorated version of the name. For example, if the
8799 symbol foo@@GNU_1.2 is the default, which should be used when
8800 foo is used with no version, then we add an indirect symbol
8801 foo which points to foo@@GNU_1.2. We ignore these symbols,
8802 since the indirected symbol is already in the hash table. */
8806 /* Give the processor backend a chance to tweak the symbol value,
8807 and also to finish up anything that needs to be done for this
8808 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8809 forced local syms when non-shared is due to a historical quirk.
8810 STT_GNU_IFUNC symbol must go through PLT. */
8811 if ((h
->type
== STT_GNU_IFUNC
8813 && !finfo
->info
->relocatable
)
8814 || ((h
->dynindx
!= -1
8816 && ((finfo
->info
->shared
8817 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
8818 || h
->root
.type
!= bfd_link_hash_undefweak
))
8819 || !h
->forced_local
)
8820 && elf_hash_table (finfo
->info
)->dynamic_sections_created
))
8822 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
8823 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
8825 eoinfo
->failed
= TRUE
;
8830 /* If we are marking the symbol as undefined, and there are no
8831 non-weak references to this symbol from a regular object, then
8832 mark the symbol as weak undefined; if there are non-weak
8833 references, mark the symbol as strong. We can't do this earlier,
8834 because it might not be marked as undefined until the
8835 finish_dynamic_symbol routine gets through with it. */
8836 if (sym
.st_shndx
== SHN_UNDEF
8838 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
8839 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
8842 unsigned int type
= ELF_ST_TYPE (sym
.st_info
);
8844 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8845 if (type
== STT_GNU_IFUNC
)
8848 if (h
->ref_regular_nonweak
)
8849 bindtype
= STB_GLOBAL
;
8851 bindtype
= STB_WEAK
;
8852 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
8855 /* If this is a symbol defined in a dynamic library, don't use the
8856 symbol size from the dynamic library. Relinking an executable
8857 against a new library may introduce gratuitous changes in the
8858 executable's symbols if we keep the size. */
8859 if (sym
.st_shndx
== SHN_UNDEF
8864 /* If a non-weak symbol with non-default visibility is not defined
8865 locally, it is a fatal error. */
8866 if (! finfo
->info
->relocatable
8867 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
8868 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
8869 && h
->root
.type
== bfd_link_hash_undefined
8872 (*_bfd_error_handler
)
8873 (_("%B: %s symbol `%s' isn't defined"),
8875 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
8877 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
8878 ? "internal" : "hidden",
8879 h
->root
.root
.string
);
8880 eoinfo
->failed
= TRUE
;
8884 /* If this symbol should be put in the .dynsym section, then put it
8885 there now. We already know the symbol index. We also fill in
8886 the entry in the .hash section. */
8887 if (h
->dynindx
!= -1
8888 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8892 sym
.st_name
= h
->dynstr_index
;
8893 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
8894 if (! check_dynsym (finfo
->output_bfd
, &sym
))
8896 eoinfo
->failed
= TRUE
;
8899 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
8901 if (finfo
->hash_sec
!= NULL
)
8903 size_t hash_entry_size
;
8904 bfd_byte
*bucketpos
;
8909 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
8910 bucket
= h
->u
.elf_hash_value
% bucketcount
;
8913 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
8914 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
8915 + (bucket
+ 2) * hash_entry_size
);
8916 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
8917 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
8918 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
8919 ((bfd_byte
*) finfo
->hash_sec
->contents
8920 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
8923 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
8925 Elf_Internal_Versym iversym
;
8926 Elf_External_Versym
*eversym
;
8928 if (!h
->def_regular
)
8930 if (h
->verinfo
.verdef
== NULL
)
8931 iversym
.vs_vers
= 0;
8933 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
8937 if (h
->verinfo
.vertree
== NULL
)
8938 iversym
.vs_vers
= 1;
8940 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
8941 if (finfo
->info
->create_default_symver
)
8946 iversym
.vs_vers
|= VERSYM_HIDDEN
;
8948 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
8949 eversym
+= h
->dynindx
;
8950 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
8954 /* If we're stripping it, then it was just a dynamic symbol, and
8955 there's nothing else to do. */
8956 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
8959 indx
= bfd_get_symcount (finfo
->output_bfd
);
8960 ret
= elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
);
8963 eoinfo
->failed
= TRUE
;
8968 else if (h
->indx
== -2)
8974 /* Return TRUE if special handling is done for relocs in SEC against
8975 symbols defined in discarded sections. */
8978 elf_section_ignore_discarded_relocs (asection
*sec
)
8980 const struct elf_backend_data
*bed
;
8982 switch (sec
->sec_info_type
)
8984 case ELF_INFO_TYPE_STABS
:
8985 case ELF_INFO_TYPE_EH_FRAME
:
8991 bed
= get_elf_backend_data (sec
->owner
);
8992 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8993 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
8999 /* Return a mask saying how ld should treat relocations in SEC against
9000 symbols defined in discarded sections. If this function returns
9001 COMPLAIN set, ld will issue a warning message. If this function
9002 returns PRETEND set, and the discarded section was link-once and the
9003 same size as the kept link-once section, ld will pretend that the
9004 symbol was actually defined in the kept section. Otherwise ld will
9005 zero the reloc (at least that is the intent, but some cooperation by
9006 the target dependent code is needed, particularly for REL targets). */
9009 _bfd_elf_default_action_discarded (asection
*sec
)
9011 if (sec
->flags
& SEC_DEBUGGING
)
9014 if (strcmp (".eh_frame", sec
->name
) == 0)
9017 if (strcmp (".gcc_except_table", sec
->name
) == 0)
9020 return COMPLAIN
| PRETEND
;
9023 /* Find a match between a section and a member of a section group. */
9026 match_group_member (asection
*sec
, asection
*group
,
9027 struct bfd_link_info
*info
)
9029 asection
*first
= elf_next_in_group (group
);
9030 asection
*s
= first
;
9034 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
9037 s
= elf_next_in_group (s
);
9045 /* Check if the kept section of a discarded section SEC can be used
9046 to replace it. Return the replacement if it is OK. Otherwise return
9050 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
9054 kept
= sec
->kept_section
;
9057 if ((kept
->flags
& SEC_GROUP
) != 0)
9058 kept
= match_group_member (sec
, kept
, info
);
9060 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
9061 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
9063 sec
->kept_section
= kept
;
9068 /* Link an input file into the linker output file. This function
9069 handles all the sections and relocations of the input file at once.
9070 This is so that we only have to read the local symbols once, and
9071 don't have to keep them in memory. */
9074 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
9076 int (*relocate_section
)
9077 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
9078 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
9080 Elf_Internal_Shdr
*symtab_hdr
;
9083 Elf_Internal_Sym
*isymbuf
;
9084 Elf_Internal_Sym
*isym
;
9085 Elf_Internal_Sym
*isymend
;
9087 asection
**ppsection
;
9089 const struct elf_backend_data
*bed
;
9090 struct elf_link_hash_entry
**sym_hashes
;
9092 output_bfd
= finfo
->output_bfd
;
9093 bed
= get_elf_backend_data (output_bfd
);
9094 relocate_section
= bed
->elf_backend_relocate_section
;
9096 /* If this is a dynamic object, we don't want to do anything here:
9097 we don't want the local symbols, and we don't want the section
9099 if ((input_bfd
->flags
& DYNAMIC
) != 0)
9102 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
9103 if (elf_bad_symtab (input_bfd
))
9105 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9110 locsymcount
= symtab_hdr
->sh_info
;
9111 extsymoff
= symtab_hdr
->sh_info
;
9114 /* Read the local symbols. */
9115 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9116 if (isymbuf
== NULL
&& locsymcount
!= 0)
9118 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
9119 finfo
->internal_syms
,
9120 finfo
->external_syms
,
9121 finfo
->locsym_shndx
);
9122 if (isymbuf
== NULL
)
9126 /* Find local symbol sections and adjust values of symbols in
9127 SEC_MERGE sections. Write out those local symbols we know are
9128 going into the output file. */
9129 isymend
= isymbuf
+ locsymcount
;
9130 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
9132 isym
++, pindex
++, ppsection
++)
9136 Elf_Internal_Sym osym
;
9142 if (elf_bad_symtab (input_bfd
))
9144 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
9151 if (isym
->st_shndx
== SHN_UNDEF
)
9152 isec
= bfd_und_section_ptr
;
9153 else if (isym
->st_shndx
== SHN_ABS
)
9154 isec
= bfd_abs_section_ptr
;
9155 else if (isym
->st_shndx
== SHN_COMMON
)
9156 isec
= bfd_com_section_ptr
;
9159 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
9162 /* Don't attempt to output symbols with st_shnx in the
9163 reserved range other than SHN_ABS and SHN_COMMON. */
9167 else if (isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
9168 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
9170 _bfd_merged_section_offset (output_bfd
, &isec
,
9171 elf_section_data (isec
)->sec_info
,
9177 /* Don't output the first, undefined, symbol. */
9178 if (ppsection
== finfo
->sections
)
9181 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
9183 /* We never output section symbols. Instead, we use the
9184 section symbol of the corresponding section in the output
9189 /* If we are stripping all symbols, we don't want to output this
9191 if (finfo
->info
->strip
== strip_all
)
9194 /* If we are discarding all local symbols, we don't want to
9195 output this one. If we are generating a relocatable output
9196 file, then some of the local symbols may be required by
9197 relocs; we output them below as we discover that they are
9199 if (finfo
->info
->discard
== discard_all
)
9202 /* If this symbol is defined in a section which we are
9203 discarding, we don't need to keep it. */
9204 if (isym
->st_shndx
!= SHN_UNDEF
9205 && isym
->st_shndx
< SHN_LORESERVE
9206 && bfd_section_removed_from_list (output_bfd
,
9207 isec
->output_section
))
9210 /* Get the name of the symbol. */
9211 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
9216 /* See if we are discarding symbols with this name. */
9217 if ((finfo
->info
->strip
== strip_some
9218 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
9220 || (((finfo
->info
->discard
== discard_sec_merge
9221 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
9222 || finfo
->info
->discard
== discard_l
)
9223 && bfd_is_local_label_name (input_bfd
, name
)))
9228 /* Adjust the section index for the output file. */
9229 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9230 isec
->output_section
);
9231 if (osym
.st_shndx
== SHN_BAD
)
9234 /* ELF symbols in relocatable files are section relative, but
9235 in executable files they are virtual addresses. Note that
9236 this code assumes that all ELF sections have an associated
9237 BFD section with a reasonable value for output_offset; below
9238 we assume that they also have a reasonable value for
9239 output_section. Any special sections must be set up to meet
9240 these requirements. */
9241 osym
.st_value
+= isec
->output_offset
;
9242 if (! finfo
->info
->relocatable
)
9244 osym
.st_value
+= isec
->output_section
->vma
;
9245 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
9247 /* STT_TLS symbols are relative to PT_TLS segment base. */
9248 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
9249 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
9253 indx
= bfd_get_symcount (output_bfd
);
9254 ret
= elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
);
9261 /* Relocate the contents of each section. */
9262 sym_hashes
= elf_sym_hashes (input_bfd
);
9263 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
9267 if (! o
->linker_mark
)
9269 /* This section was omitted from the link. */
9273 if (finfo
->info
->relocatable
9274 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
9276 /* Deal with the group signature symbol. */
9277 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
9278 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
9279 asection
*osec
= o
->output_section
;
9281 if (symndx
>= locsymcount
9282 || (elf_bad_symtab (input_bfd
)
9283 && finfo
->sections
[symndx
] == NULL
))
9285 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
9286 while (h
->root
.type
== bfd_link_hash_indirect
9287 || h
->root
.type
== bfd_link_hash_warning
)
9288 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9289 /* Arrange for symbol to be output. */
9291 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
9293 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
9295 /* We'll use the output section target_index. */
9296 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9297 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
9301 if (finfo
->indices
[symndx
] == -1)
9303 /* Otherwise output the local symbol now. */
9304 Elf_Internal_Sym sym
= isymbuf
[symndx
];
9305 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9310 name
= bfd_elf_string_from_elf_section (input_bfd
,
9311 symtab_hdr
->sh_link
,
9316 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9318 if (sym
.st_shndx
== SHN_BAD
)
9321 sym
.st_value
+= o
->output_offset
;
9323 indx
= bfd_get_symcount (output_bfd
);
9324 ret
= elf_link_output_sym (finfo
, name
, &sym
, o
, NULL
);
9328 finfo
->indices
[symndx
] = indx
;
9332 elf_section_data (osec
)->this_hdr
.sh_info
9333 = finfo
->indices
[symndx
];
9337 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
9338 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
9341 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
9343 /* Section was created by _bfd_elf_link_create_dynamic_sections
9348 /* Get the contents of the section. They have been cached by a
9349 relaxation routine. Note that o is a section in an input
9350 file, so the contents field will not have been set by any of
9351 the routines which work on output files. */
9352 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
9353 contents
= elf_section_data (o
)->this_hdr
.contents
;
9356 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
9358 contents
= finfo
->contents
;
9359 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
9363 if ((o
->flags
& SEC_RELOC
) != 0)
9365 Elf_Internal_Rela
*internal_relocs
;
9366 Elf_Internal_Rela
*rel
, *relend
;
9367 bfd_vma r_type_mask
;
9369 int action_discarded
;
9372 /* Get the swapped relocs. */
9374 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
9375 finfo
->internal_relocs
, FALSE
);
9376 if (internal_relocs
== NULL
9377 && o
->reloc_count
> 0)
9380 if (bed
->s
->arch_size
== 32)
9387 r_type_mask
= 0xffffffff;
9391 action_discarded
= -1;
9392 if (!elf_section_ignore_discarded_relocs (o
))
9393 action_discarded
= (*bed
->action_discarded
) (o
);
9395 /* Run through the relocs evaluating complex reloc symbols and
9396 looking for relocs against symbols from discarded sections
9397 or section symbols from removed link-once sections.
9398 Complain about relocs against discarded sections. Zero
9399 relocs against removed link-once sections. */
9401 rel
= internal_relocs
;
9402 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9403 for ( ; rel
< relend
; rel
++)
9405 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
9406 unsigned int s_type
;
9407 asection
**ps
, *sec
;
9408 struct elf_link_hash_entry
*h
= NULL
;
9409 const char *sym_name
;
9411 if (r_symndx
== STN_UNDEF
)
9414 if (r_symndx
>= locsymcount
9415 || (elf_bad_symtab (input_bfd
)
9416 && finfo
->sections
[r_symndx
] == NULL
))
9418 h
= sym_hashes
[r_symndx
- extsymoff
];
9420 /* Badly formatted input files can contain relocs that
9421 reference non-existant symbols. Check here so that
9422 we do not seg fault. */
9427 sprintf_vma (buffer
, rel
->r_info
);
9428 (*_bfd_error_handler
)
9429 (_("error: %B contains a reloc (0x%s) for section %A "
9430 "that references a non-existent global symbol"),
9431 input_bfd
, o
, buffer
);
9432 bfd_set_error (bfd_error_bad_value
);
9436 while (h
->root
.type
== bfd_link_hash_indirect
9437 || h
->root
.type
== bfd_link_hash_warning
)
9438 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9443 if (h
->root
.type
== bfd_link_hash_defined
9444 || h
->root
.type
== bfd_link_hash_defweak
)
9445 ps
= &h
->root
.u
.def
.section
;
9447 sym_name
= h
->root
.root
.string
;
9451 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
9453 s_type
= ELF_ST_TYPE (sym
->st_info
);
9454 ps
= &finfo
->sections
[r_symndx
];
9455 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
9459 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
9460 && !finfo
->info
->relocatable
)
9463 bfd_vma dot
= (rel
->r_offset
9464 + o
->output_offset
+ o
->output_section
->vma
);
9466 printf ("Encountered a complex symbol!");
9467 printf (" (input_bfd %s, section %s, reloc %ld\n",
9468 input_bfd
->filename
, o
->name
,
9469 (long) (rel
- internal_relocs
));
9470 printf (" symbol: idx %8.8lx, name %s\n",
9471 r_symndx
, sym_name
);
9472 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9473 (unsigned long) rel
->r_info
,
9474 (unsigned long) rel
->r_offset
);
9476 if (!eval_symbol (&val
, &sym_name
, input_bfd
, finfo
, dot
,
9477 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
9480 /* Symbol evaluated OK. Update to absolute value. */
9481 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
9486 if (action_discarded
!= -1 && ps
!= NULL
)
9488 /* Complain if the definition comes from a
9489 discarded section. */
9490 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
9492 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
9493 if (action_discarded
& COMPLAIN
)
9494 (*finfo
->info
->callbacks
->einfo
)
9495 (_("%X`%s' referenced in section `%A' of %B: "
9496 "defined in discarded section `%A' of %B\n"),
9497 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
9499 /* Try to do the best we can to support buggy old
9500 versions of gcc. Pretend that the symbol is
9501 really defined in the kept linkonce section.
9502 FIXME: This is quite broken. Modifying the
9503 symbol here means we will be changing all later
9504 uses of the symbol, not just in this section. */
9505 if (action_discarded
& PRETEND
)
9509 kept
= _bfd_elf_check_kept_section (sec
,
9521 /* Relocate the section by invoking a back end routine.
9523 The back end routine is responsible for adjusting the
9524 section contents as necessary, and (if using Rela relocs
9525 and generating a relocatable output file) adjusting the
9526 reloc addend as necessary.
9528 The back end routine does not have to worry about setting
9529 the reloc address or the reloc symbol index.
9531 The back end routine is given a pointer to the swapped in
9532 internal symbols, and can access the hash table entries
9533 for the external symbols via elf_sym_hashes (input_bfd).
9535 When generating relocatable output, the back end routine
9536 must handle STB_LOCAL/STT_SECTION symbols specially. The
9537 output symbol is going to be a section symbol
9538 corresponding to the output section, which will require
9539 the addend to be adjusted. */
9541 ret
= (*relocate_section
) (output_bfd
, finfo
->info
,
9542 input_bfd
, o
, contents
,
9550 || finfo
->info
->relocatable
9551 || finfo
->info
->emitrelocations
)
9553 Elf_Internal_Rela
*irela
;
9554 Elf_Internal_Rela
*irelaend
, *irelamid
;
9555 bfd_vma last_offset
;
9556 struct elf_link_hash_entry
**rel_hash
;
9557 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
9558 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
9559 unsigned int next_erel
;
9560 bfd_boolean rela_normal
;
9561 struct bfd_elf_section_data
*esdi
, *esdo
;
9563 esdi
= elf_section_data (o
);
9564 esdo
= elf_section_data (o
->output_section
);
9565 rela_normal
= FALSE
;
9567 /* Adjust the reloc addresses and symbol indices. */
9569 irela
= internal_relocs
;
9570 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9571 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
9572 /* We start processing the REL relocs, if any. When we reach
9573 IRELAMID in the loop, we switch to the RELA relocs. */
9575 if (esdi
->rel
.hdr
!= NULL
)
9576 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
9577 * bed
->s
->int_rels_per_ext_rel
);
9578 rel_hash_list
= rel_hash
;
9579 rela_hash_list
= NULL
;
9580 last_offset
= o
->output_offset
;
9581 if (!finfo
->info
->relocatable
)
9582 last_offset
+= o
->output_section
->vma
;
9583 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
9585 unsigned long r_symndx
;
9587 Elf_Internal_Sym sym
;
9589 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
9595 if (irela
== irelamid
)
9597 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
9598 rela_hash_list
= rel_hash
;
9599 rela_normal
= bed
->rela_normal
;
9602 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
9605 if (irela
->r_offset
>= (bfd_vma
) -2)
9607 /* This is a reloc for a deleted entry or somesuch.
9608 Turn it into an R_*_NONE reloc, at the same
9609 offset as the last reloc. elf_eh_frame.c and
9610 bfd_elf_discard_info rely on reloc offsets
9612 irela
->r_offset
= last_offset
;
9614 irela
->r_addend
= 0;
9618 irela
->r_offset
+= o
->output_offset
;
9620 /* Relocs in an executable have to be virtual addresses. */
9621 if (!finfo
->info
->relocatable
)
9622 irela
->r_offset
+= o
->output_section
->vma
;
9624 last_offset
= irela
->r_offset
;
9626 r_symndx
= irela
->r_info
>> r_sym_shift
;
9627 if (r_symndx
== STN_UNDEF
)
9630 if (r_symndx
>= locsymcount
9631 || (elf_bad_symtab (input_bfd
)
9632 && finfo
->sections
[r_symndx
] == NULL
))
9634 struct elf_link_hash_entry
*rh
;
9637 /* This is a reloc against a global symbol. We
9638 have not yet output all the local symbols, so
9639 we do not know the symbol index of any global
9640 symbol. We set the rel_hash entry for this
9641 reloc to point to the global hash table entry
9642 for this symbol. The symbol index is then
9643 set at the end of bfd_elf_final_link. */
9644 indx
= r_symndx
- extsymoff
;
9645 rh
= elf_sym_hashes (input_bfd
)[indx
];
9646 while (rh
->root
.type
== bfd_link_hash_indirect
9647 || rh
->root
.type
== bfd_link_hash_warning
)
9648 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
9650 /* Setting the index to -2 tells
9651 elf_link_output_extsym that this symbol is
9653 BFD_ASSERT (rh
->indx
< 0);
9661 /* This is a reloc against a local symbol. */
9664 sym
= isymbuf
[r_symndx
];
9665 sec
= finfo
->sections
[r_symndx
];
9666 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
9668 /* I suppose the backend ought to fill in the
9669 section of any STT_SECTION symbol against a
9670 processor specific section. */
9671 r_symndx
= STN_UNDEF
;
9672 if (bfd_is_abs_section (sec
))
9674 else if (sec
== NULL
|| sec
->owner
== NULL
)
9676 bfd_set_error (bfd_error_bad_value
);
9681 asection
*osec
= sec
->output_section
;
9683 /* If we have discarded a section, the output
9684 section will be the absolute section. In
9685 case of discarded SEC_MERGE sections, use
9686 the kept section. relocate_section should
9687 have already handled discarded linkonce
9689 if (bfd_is_abs_section (osec
)
9690 && sec
->kept_section
!= NULL
9691 && sec
->kept_section
->output_section
!= NULL
)
9693 osec
= sec
->kept_section
->output_section
;
9694 irela
->r_addend
-= osec
->vma
;
9697 if (!bfd_is_abs_section (osec
))
9699 r_symndx
= osec
->target_index
;
9700 if (r_symndx
== STN_UNDEF
)
9702 struct elf_link_hash_table
*htab
;
9705 htab
= elf_hash_table (finfo
->info
);
9706 oi
= htab
->text_index_section
;
9707 if ((osec
->flags
& SEC_READONLY
) == 0
9708 && htab
->data_index_section
!= NULL
)
9709 oi
= htab
->data_index_section
;
9713 irela
->r_addend
+= osec
->vma
- oi
->vma
;
9714 r_symndx
= oi
->target_index
;
9718 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
9722 /* Adjust the addend according to where the
9723 section winds up in the output section. */
9725 irela
->r_addend
+= sec
->output_offset
;
9729 if (finfo
->indices
[r_symndx
] == -1)
9731 unsigned long shlink
;
9736 if (finfo
->info
->strip
== strip_all
)
9738 /* You can't do ld -r -s. */
9739 bfd_set_error (bfd_error_invalid_operation
);
9743 /* This symbol was skipped earlier, but
9744 since it is needed by a reloc, we
9745 must output it now. */
9746 shlink
= symtab_hdr
->sh_link
;
9747 name
= (bfd_elf_string_from_elf_section
9748 (input_bfd
, shlink
, sym
.st_name
));
9752 osec
= sec
->output_section
;
9754 _bfd_elf_section_from_bfd_section (output_bfd
,
9756 if (sym
.st_shndx
== SHN_BAD
)
9759 sym
.st_value
+= sec
->output_offset
;
9760 if (! finfo
->info
->relocatable
)
9762 sym
.st_value
+= osec
->vma
;
9763 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
9765 /* STT_TLS symbols are relative to PT_TLS
9767 BFD_ASSERT (elf_hash_table (finfo
->info
)
9769 sym
.st_value
-= (elf_hash_table (finfo
->info
)
9774 indx
= bfd_get_symcount (output_bfd
);
9775 ret
= elf_link_output_sym (finfo
, name
, &sym
, sec
,
9780 finfo
->indices
[r_symndx
] = indx
;
9785 r_symndx
= finfo
->indices
[r_symndx
];
9788 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
9789 | (irela
->r_info
& r_type_mask
));
9792 /* Swap out the relocs. */
9793 input_rel_hdr
= esdi
->rel
.hdr
;
9794 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
9796 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9801 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
9802 * bed
->s
->int_rels_per_ext_rel
);
9803 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
9806 input_rela_hdr
= esdi
->rela
.hdr
;
9807 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
9809 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9818 /* Write out the modified section contents. */
9819 if (bed
->elf_backend_write_section
9820 && (*bed
->elf_backend_write_section
) (output_bfd
, finfo
->info
, o
,
9823 /* Section written out. */
9825 else switch (o
->sec_info_type
)
9827 case ELF_INFO_TYPE_STABS
:
9828 if (! (_bfd_write_section_stabs
9830 &elf_hash_table (finfo
->info
)->stab_info
,
9831 o
, &elf_section_data (o
)->sec_info
, contents
)))
9834 case ELF_INFO_TYPE_MERGE
:
9835 if (! _bfd_write_merged_section (output_bfd
, o
,
9836 elf_section_data (o
)->sec_info
))
9839 case ELF_INFO_TYPE_EH_FRAME
:
9841 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
9848 /* FIXME: octets_per_byte. */
9849 if (! (o
->flags
& SEC_EXCLUDE
)
9850 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
9852 (file_ptr
) o
->output_offset
,
9863 /* Generate a reloc when linking an ELF file. This is a reloc
9864 requested by the linker, and does not come from any input file. This
9865 is used to build constructor and destructor tables when linking
9869 elf_reloc_link_order (bfd
*output_bfd
,
9870 struct bfd_link_info
*info
,
9871 asection
*output_section
,
9872 struct bfd_link_order
*link_order
)
9874 reloc_howto_type
*howto
;
9878 struct bfd_elf_section_reloc_data
*reldata
;
9879 struct elf_link_hash_entry
**rel_hash_ptr
;
9880 Elf_Internal_Shdr
*rel_hdr
;
9881 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
9882 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
9885 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
9887 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
9890 bfd_set_error (bfd_error_bad_value
);
9894 addend
= link_order
->u
.reloc
.p
->addend
;
9897 reldata
= &esdo
->rel
;
9898 else if (esdo
->rela
.hdr
)
9899 reldata
= &esdo
->rela
;
9906 /* Figure out the symbol index. */
9907 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
9908 if (link_order
->type
== bfd_section_reloc_link_order
)
9910 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
9911 BFD_ASSERT (indx
!= 0);
9912 *rel_hash_ptr
= NULL
;
9916 struct elf_link_hash_entry
*h
;
9918 /* Treat a reloc against a defined symbol as though it were
9919 actually against the section. */
9920 h
= ((struct elf_link_hash_entry
*)
9921 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
9922 link_order
->u
.reloc
.p
->u
.name
,
9923 FALSE
, FALSE
, TRUE
));
9925 && (h
->root
.type
== bfd_link_hash_defined
9926 || h
->root
.type
== bfd_link_hash_defweak
))
9930 section
= h
->root
.u
.def
.section
;
9931 indx
= section
->output_section
->target_index
;
9932 *rel_hash_ptr
= NULL
;
9933 /* It seems that we ought to add the symbol value to the
9934 addend here, but in practice it has already been added
9935 because it was passed to constructor_callback. */
9936 addend
+= section
->output_section
->vma
+ section
->output_offset
;
9940 /* Setting the index to -2 tells elf_link_output_extsym that
9941 this symbol is used by a reloc. */
9948 if (! ((*info
->callbacks
->unattached_reloc
)
9949 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
9955 /* If this is an inplace reloc, we must write the addend into the
9957 if (howto
->partial_inplace
&& addend
!= 0)
9960 bfd_reloc_status_type rstat
;
9963 const char *sym_name
;
9965 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
9966 buf
= (bfd_byte
*) bfd_zmalloc (size
);
9969 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
9976 case bfd_reloc_outofrange
:
9979 case bfd_reloc_overflow
:
9980 if (link_order
->type
== bfd_section_reloc_link_order
)
9981 sym_name
= bfd_section_name (output_bfd
,
9982 link_order
->u
.reloc
.p
->u
.section
);
9984 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
9985 if (! ((*info
->callbacks
->reloc_overflow
)
9986 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
9987 NULL
, (bfd_vma
) 0)))
9994 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
9995 link_order
->offset
, size
);
10001 /* The address of a reloc is relative to the section in a
10002 relocatable file, and is a virtual address in an executable
10004 offset
= link_order
->offset
;
10005 if (! info
->relocatable
)
10006 offset
+= output_section
->vma
;
10008 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
10010 irel
[i
].r_offset
= offset
;
10011 irel
[i
].r_info
= 0;
10012 irel
[i
].r_addend
= 0;
10014 if (bed
->s
->arch_size
== 32)
10015 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
10017 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
10019 rel_hdr
= reldata
->hdr
;
10020 erel
= rel_hdr
->contents
;
10021 if (rel_hdr
->sh_type
== SHT_REL
)
10023 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
10024 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
10028 irel
[0].r_addend
= addend
;
10029 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
10030 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
10039 /* Get the output vma of the section pointed to by the sh_link field. */
10042 elf_get_linked_section_vma (struct bfd_link_order
*p
)
10044 Elf_Internal_Shdr
**elf_shdrp
;
10048 s
= p
->u
.indirect
.section
;
10049 elf_shdrp
= elf_elfsections (s
->owner
);
10050 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
10051 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
10053 The Intel C compiler generates SHT_IA_64_UNWIND with
10054 SHF_LINK_ORDER. But it doesn't set the sh_link or
10055 sh_info fields. Hence we could get the situation
10056 where elfsec is 0. */
10059 const struct elf_backend_data
*bed
10060 = get_elf_backend_data (s
->owner
);
10061 if (bed
->link_order_error_handler
)
10062 bed
->link_order_error_handler
10063 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
10068 s
= elf_shdrp
[elfsec
]->bfd_section
;
10069 return s
->output_section
->vma
+ s
->output_offset
;
10074 /* Compare two sections based on the locations of the sections they are
10075 linked to. Used by elf_fixup_link_order. */
10078 compare_link_order (const void * a
, const void * b
)
10083 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
10084 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
10087 return apos
> bpos
;
10091 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10092 order as their linked sections. Returns false if this could not be done
10093 because an output section includes both ordered and unordered
10094 sections. Ideally we'd do this in the linker proper. */
10097 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
10099 int seen_linkorder
;
10102 struct bfd_link_order
*p
;
10104 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10106 struct bfd_link_order
**sections
;
10107 asection
*s
, *other_sec
, *linkorder_sec
;
10111 linkorder_sec
= NULL
;
10113 seen_linkorder
= 0;
10114 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10116 if (p
->type
== bfd_indirect_link_order
)
10118 s
= p
->u
.indirect
.section
;
10120 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10121 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
10122 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
10123 && elfsec
< elf_numsections (sub
)
10124 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
10125 && elf_elfsections (sub
)[elfsec
]->sh_link
< elf_numsections (sub
))
10139 if (seen_other
&& seen_linkorder
)
10141 if (other_sec
&& linkorder_sec
)
10142 (*_bfd_error_handler
) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10144 linkorder_sec
->owner
, other_sec
,
10147 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
10149 bfd_set_error (bfd_error_bad_value
);
10154 if (!seen_linkorder
)
10157 sections
= (struct bfd_link_order
**)
10158 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
10159 if (sections
== NULL
)
10161 seen_linkorder
= 0;
10163 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10165 sections
[seen_linkorder
++] = p
;
10167 /* Sort the input sections in the order of their linked section. */
10168 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
10169 compare_link_order
);
10171 /* Change the offsets of the sections. */
10173 for (n
= 0; n
< seen_linkorder
; n
++)
10175 s
= sections
[n
]->u
.indirect
.section
;
10176 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
10177 s
->output_offset
= offset
;
10178 sections
[n
]->offset
= offset
;
10179 /* FIXME: octets_per_byte. */
10180 offset
+= sections
[n
]->size
;
10188 /* Do the final step of an ELF link. */
10191 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
10193 bfd_boolean dynamic
;
10194 bfd_boolean emit_relocs
;
10196 struct elf_final_link_info finfo
;
10198 struct bfd_link_order
*p
;
10200 bfd_size_type max_contents_size
;
10201 bfd_size_type max_external_reloc_size
;
10202 bfd_size_type max_internal_reloc_count
;
10203 bfd_size_type max_sym_count
;
10204 bfd_size_type max_sym_shndx_count
;
10206 Elf_Internal_Sym elfsym
;
10208 Elf_Internal_Shdr
*symtab_hdr
;
10209 Elf_Internal_Shdr
*symtab_shndx_hdr
;
10210 Elf_Internal_Shdr
*symstrtab_hdr
;
10211 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10212 struct elf_outext_info eoinfo
;
10213 bfd_boolean merged
;
10214 size_t relativecount
= 0;
10215 asection
*reldyn
= 0;
10217 asection
*attr_section
= NULL
;
10218 bfd_vma attr_size
= 0;
10219 const char *std_attrs_section
;
10221 if (! is_elf_hash_table (info
->hash
))
10225 abfd
->flags
|= DYNAMIC
;
10227 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
10228 dynobj
= elf_hash_table (info
)->dynobj
;
10230 emit_relocs
= (info
->relocatable
10231 || info
->emitrelocations
);
10234 finfo
.output_bfd
= abfd
;
10235 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
10236 if (finfo
.symstrtab
== NULL
)
10241 finfo
.dynsym_sec
= NULL
;
10242 finfo
.hash_sec
= NULL
;
10243 finfo
.symver_sec
= NULL
;
10247 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
10248 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
10249 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
);
10250 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
10251 /* Note that it is OK if symver_sec is NULL. */
10254 finfo
.contents
= NULL
;
10255 finfo
.external_relocs
= NULL
;
10256 finfo
.internal_relocs
= NULL
;
10257 finfo
.external_syms
= NULL
;
10258 finfo
.locsym_shndx
= NULL
;
10259 finfo
.internal_syms
= NULL
;
10260 finfo
.indices
= NULL
;
10261 finfo
.sections
= NULL
;
10262 finfo
.symbuf
= NULL
;
10263 finfo
.symshndxbuf
= NULL
;
10264 finfo
.symbuf_count
= 0;
10265 finfo
.shndxbuf_size
= 0;
10267 /* The object attributes have been merged. Remove the input
10268 sections from the link, and set the contents of the output
10270 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
10271 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10273 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
10274 || strcmp (o
->name
, ".gnu.attributes") == 0)
10276 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10278 asection
*input_section
;
10280 if (p
->type
!= bfd_indirect_link_order
)
10282 input_section
= p
->u
.indirect
.section
;
10283 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10284 elf_link_input_bfd ignores this section. */
10285 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
10288 attr_size
= bfd_elf_obj_attr_size (abfd
);
10291 bfd_set_section_size (abfd
, o
, attr_size
);
10293 /* Skip this section later on. */
10294 o
->map_head
.link_order
= NULL
;
10297 o
->flags
|= SEC_EXCLUDE
;
10301 /* Count up the number of relocations we will output for each output
10302 section, so that we know the sizes of the reloc sections. We
10303 also figure out some maximum sizes. */
10304 max_contents_size
= 0;
10305 max_external_reloc_size
= 0;
10306 max_internal_reloc_count
= 0;
10308 max_sym_shndx_count
= 0;
10310 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10312 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10313 o
->reloc_count
= 0;
10315 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10317 unsigned int reloc_count
= 0;
10318 struct bfd_elf_section_data
*esdi
= NULL
;
10320 if (p
->type
== bfd_section_reloc_link_order
10321 || p
->type
== bfd_symbol_reloc_link_order
)
10323 else if (p
->type
== bfd_indirect_link_order
)
10327 sec
= p
->u
.indirect
.section
;
10328 esdi
= elf_section_data (sec
);
10330 /* Mark all sections which are to be included in the
10331 link. This will normally be every section. We need
10332 to do this so that we can identify any sections which
10333 the linker has decided to not include. */
10334 sec
->linker_mark
= TRUE
;
10336 if (sec
->flags
& SEC_MERGE
)
10339 if (info
->relocatable
|| info
->emitrelocations
)
10340 reloc_count
= sec
->reloc_count
;
10341 else if (bed
->elf_backend_count_relocs
)
10342 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
10344 if (sec
->rawsize
> max_contents_size
)
10345 max_contents_size
= sec
->rawsize
;
10346 if (sec
->size
> max_contents_size
)
10347 max_contents_size
= sec
->size
;
10349 /* We are interested in just local symbols, not all
10351 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
10352 && (sec
->owner
->flags
& DYNAMIC
) == 0)
10356 if (elf_bad_symtab (sec
->owner
))
10357 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
10358 / bed
->s
->sizeof_sym
);
10360 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
10362 if (sym_count
> max_sym_count
)
10363 max_sym_count
= sym_count
;
10365 if (sym_count
> max_sym_shndx_count
10366 && elf_symtab_shndx (sec
->owner
) != 0)
10367 max_sym_shndx_count
= sym_count
;
10369 if ((sec
->flags
& SEC_RELOC
) != 0)
10371 size_t ext_size
= 0;
10373 if (esdi
->rel
.hdr
!= NULL
)
10374 ext_size
= esdi
->rel
.hdr
->sh_size
;
10375 if (esdi
->rela
.hdr
!= NULL
)
10376 ext_size
+= esdi
->rela
.hdr
->sh_size
;
10378 if (ext_size
> max_external_reloc_size
)
10379 max_external_reloc_size
= ext_size
;
10380 if (sec
->reloc_count
> max_internal_reloc_count
)
10381 max_internal_reloc_count
= sec
->reloc_count
;
10386 if (reloc_count
== 0)
10389 o
->reloc_count
+= reloc_count
;
10391 if (p
->type
== bfd_indirect_link_order
10392 && (info
->relocatable
|| info
->emitrelocations
))
10395 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
10396 if (esdi
->rela
.hdr
)
10397 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
10402 esdo
->rela
.count
+= reloc_count
;
10404 esdo
->rel
.count
+= reloc_count
;
10408 if (o
->reloc_count
> 0)
10409 o
->flags
|= SEC_RELOC
;
10412 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10413 set it (this is probably a bug) and if it is set
10414 assign_section_numbers will create a reloc section. */
10415 o
->flags
&=~ SEC_RELOC
;
10418 /* If the SEC_ALLOC flag is not set, force the section VMA to
10419 zero. This is done in elf_fake_sections as well, but forcing
10420 the VMA to 0 here will ensure that relocs against these
10421 sections are handled correctly. */
10422 if ((o
->flags
& SEC_ALLOC
) == 0
10423 && ! o
->user_set_vma
)
10427 if (! info
->relocatable
&& merged
)
10428 elf_link_hash_traverse (elf_hash_table (info
),
10429 _bfd_elf_link_sec_merge_syms
, abfd
);
10431 /* Figure out the file positions for everything but the symbol table
10432 and the relocs. We set symcount to force assign_section_numbers
10433 to create a symbol table. */
10434 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
10435 BFD_ASSERT (! abfd
->output_has_begun
);
10436 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
10439 /* Set sizes, and assign file positions for reloc sections. */
10440 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10442 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10443 if ((o
->flags
& SEC_RELOC
) != 0)
10446 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
10450 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
10454 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10455 to count upwards while actually outputting the relocations. */
10456 esdo
->rel
.count
= 0;
10457 esdo
->rela
.count
= 0;
10460 _bfd_elf_assign_file_positions_for_relocs (abfd
);
10462 /* We have now assigned file positions for all the sections except
10463 .symtab and .strtab. We start the .symtab section at the current
10464 file position, and write directly to it. We build the .strtab
10465 section in memory. */
10466 bfd_get_symcount (abfd
) = 0;
10467 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10468 /* sh_name is set in prep_headers. */
10469 symtab_hdr
->sh_type
= SHT_SYMTAB
;
10470 /* sh_flags, sh_addr and sh_size all start off zero. */
10471 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
10472 /* sh_link is set in assign_section_numbers. */
10473 /* sh_info is set below. */
10474 /* sh_offset is set just below. */
10475 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
10477 off
= elf_tdata (abfd
)->next_file_pos
;
10478 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
10480 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10481 incorrect. We do not yet know the size of the .symtab section.
10482 We correct next_file_pos below, after we do know the size. */
10484 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10485 continuously seeking to the right position in the file. */
10486 if (! info
->keep_memory
|| max_sym_count
< 20)
10487 finfo
.symbuf_size
= 20;
10489 finfo
.symbuf_size
= max_sym_count
;
10490 amt
= finfo
.symbuf_size
;
10491 amt
*= bed
->s
->sizeof_sym
;
10492 finfo
.symbuf
= (bfd_byte
*) bfd_malloc (amt
);
10493 if (finfo
.symbuf
== NULL
)
10495 if (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF))
10497 /* Wild guess at number of output symbols. realloc'd as needed. */
10498 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
10499 finfo
.shndxbuf_size
= amt
;
10500 amt
*= sizeof (Elf_External_Sym_Shndx
);
10501 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
10502 if (finfo
.symshndxbuf
== NULL
)
10506 /* Start writing out the symbol table. The first symbol is always a
10508 if (info
->strip
!= strip_all
10511 elfsym
.st_value
= 0;
10512 elfsym
.st_size
= 0;
10513 elfsym
.st_info
= 0;
10514 elfsym
.st_other
= 0;
10515 elfsym
.st_shndx
= SHN_UNDEF
;
10516 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
10521 /* Output a symbol for each section. We output these even if we are
10522 discarding local symbols, since they are used for relocs. These
10523 symbols have no names. We store the index of each one in the
10524 index field of the section, so that we can find it again when
10525 outputting relocs. */
10526 if (info
->strip
!= strip_all
10529 elfsym
.st_size
= 0;
10530 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10531 elfsym
.st_other
= 0;
10532 elfsym
.st_value
= 0;
10533 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10535 o
= bfd_section_from_elf_index (abfd
, i
);
10538 o
->target_index
= bfd_get_symcount (abfd
);
10539 elfsym
.st_shndx
= i
;
10540 if (!info
->relocatable
)
10541 elfsym
.st_value
= o
->vma
;
10542 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
) != 1)
10548 /* Allocate some memory to hold information read in from the input
10550 if (max_contents_size
!= 0)
10552 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
10553 if (finfo
.contents
== NULL
)
10557 if (max_external_reloc_size
!= 0)
10559 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
10560 if (finfo
.external_relocs
== NULL
)
10564 if (max_internal_reloc_count
!= 0)
10566 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10567 amt
*= sizeof (Elf_Internal_Rela
);
10568 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
10569 if (finfo
.internal_relocs
== NULL
)
10573 if (max_sym_count
!= 0)
10575 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
10576 finfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
10577 if (finfo
.external_syms
== NULL
)
10580 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
10581 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
10582 if (finfo
.internal_syms
== NULL
)
10585 amt
= max_sym_count
* sizeof (long);
10586 finfo
.indices
= (long int *) bfd_malloc (amt
);
10587 if (finfo
.indices
== NULL
)
10590 amt
= max_sym_count
* sizeof (asection
*);
10591 finfo
.sections
= (asection
**) bfd_malloc (amt
);
10592 if (finfo
.sections
== NULL
)
10596 if (max_sym_shndx_count
!= 0)
10598 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
10599 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
10600 if (finfo
.locsym_shndx
== NULL
)
10604 if (elf_hash_table (info
)->tls_sec
)
10606 bfd_vma base
, end
= 0;
10609 for (sec
= elf_hash_table (info
)->tls_sec
;
10610 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
10613 bfd_size_type size
= sec
->size
;
10616 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
10618 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
10621 size
= ord
->offset
+ ord
->size
;
10623 end
= sec
->vma
+ size
;
10625 base
= elf_hash_table (info
)->tls_sec
->vma
;
10626 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
10627 elf_hash_table (info
)->tls_size
= end
- base
;
10630 /* Reorder SHF_LINK_ORDER sections. */
10631 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10633 if (!elf_fixup_link_order (abfd
, o
))
10637 /* Since ELF permits relocations to be against local symbols, we
10638 must have the local symbols available when we do the relocations.
10639 Since we would rather only read the local symbols once, and we
10640 would rather not keep them in memory, we handle all the
10641 relocations for a single input file at the same time.
10643 Unfortunately, there is no way to know the total number of local
10644 symbols until we have seen all of them, and the local symbol
10645 indices precede the global symbol indices. This means that when
10646 we are generating relocatable output, and we see a reloc against
10647 a global symbol, we can not know the symbol index until we have
10648 finished examining all the local symbols to see which ones we are
10649 going to output. To deal with this, we keep the relocations in
10650 memory, and don't output them until the end of the link. This is
10651 an unfortunate waste of memory, but I don't see a good way around
10652 it. Fortunately, it only happens when performing a relocatable
10653 link, which is not the common case. FIXME: If keep_memory is set
10654 we could write the relocs out and then read them again; I don't
10655 know how bad the memory loss will be. */
10657 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10658 sub
->output_has_begun
= FALSE
;
10659 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10661 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10663 if (p
->type
== bfd_indirect_link_order
10664 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
10665 == bfd_target_elf_flavour
)
10666 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
10668 if (! sub
->output_has_begun
)
10670 if (! elf_link_input_bfd (&finfo
, sub
))
10672 sub
->output_has_begun
= TRUE
;
10675 else if (p
->type
== bfd_section_reloc_link_order
10676 || p
->type
== bfd_symbol_reloc_link_order
)
10678 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
10683 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
10689 /* Free symbol buffer if needed. */
10690 if (!info
->reduce_memory_overheads
)
10692 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10693 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10694 && elf_tdata (sub
)->symbuf
)
10696 free (elf_tdata (sub
)->symbuf
);
10697 elf_tdata (sub
)->symbuf
= NULL
;
10701 /* Output any global symbols that got converted to local in a
10702 version script or due to symbol visibility. We do this in a
10703 separate step since ELF requires all local symbols to appear
10704 prior to any global symbols. FIXME: We should only do this if
10705 some global symbols were, in fact, converted to become local.
10706 FIXME: Will this work correctly with the Irix 5 linker? */
10707 eoinfo
.failed
= FALSE
;
10708 eoinfo
.finfo
= &finfo
;
10709 eoinfo
.localsyms
= TRUE
;
10710 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10715 /* If backend needs to output some local symbols not present in the hash
10716 table, do it now. */
10717 if (bed
->elf_backend_output_arch_local_syms
)
10719 typedef int (*out_sym_func
)
10720 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10721 struct elf_link_hash_entry
*);
10723 if (! ((*bed
->elf_backend_output_arch_local_syms
)
10724 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10728 /* That wrote out all the local symbols. Finish up the symbol table
10729 with the global symbols. Even if we want to strip everything we
10730 can, we still need to deal with those global symbols that got
10731 converted to local in a version script. */
10733 /* The sh_info field records the index of the first non local symbol. */
10734 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
10737 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
10739 Elf_Internal_Sym sym
;
10740 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
10741 long last_local
= 0;
10743 /* Write out the section symbols for the output sections. */
10744 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
10750 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10753 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
10759 dynindx
= elf_section_data (s
)->dynindx
;
10762 indx
= elf_section_data (s
)->this_idx
;
10763 BFD_ASSERT (indx
> 0);
10764 sym
.st_shndx
= indx
;
10765 if (! check_dynsym (abfd
, &sym
))
10767 sym
.st_value
= s
->vma
;
10768 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
10769 if (last_local
< dynindx
)
10770 last_local
= dynindx
;
10771 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10775 /* Write out the local dynsyms. */
10776 if (elf_hash_table (info
)->dynlocal
)
10778 struct elf_link_local_dynamic_entry
*e
;
10779 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
10784 /* Copy the internal symbol and turn off visibility.
10785 Note that we saved a word of storage and overwrote
10786 the original st_name with the dynstr_index. */
10788 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10790 s
= bfd_section_from_elf_index (e
->input_bfd
,
10795 elf_section_data (s
->output_section
)->this_idx
;
10796 if (! check_dynsym (abfd
, &sym
))
10798 sym
.st_value
= (s
->output_section
->vma
10800 + e
->isym
.st_value
);
10803 if (last_local
< e
->dynindx
)
10804 last_local
= e
->dynindx
;
10806 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
10807 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10811 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
10815 /* We get the global symbols from the hash table. */
10816 eoinfo
.failed
= FALSE
;
10817 eoinfo
.localsyms
= FALSE
;
10818 eoinfo
.finfo
= &finfo
;
10819 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10824 /* If backend needs to output some symbols not present in the hash
10825 table, do it now. */
10826 if (bed
->elf_backend_output_arch_syms
)
10828 typedef int (*out_sym_func
)
10829 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10830 struct elf_link_hash_entry
*);
10832 if (! ((*bed
->elf_backend_output_arch_syms
)
10833 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10837 /* Flush all symbols to the file. */
10838 if (! elf_link_flush_output_syms (&finfo
, bed
))
10841 /* Now we know the size of the symtab section. */
10842 off
+= symtab_hdr
->sh_size
;
10844 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
10845 if (symtab_shndx_hdr
->sh_name
!= 0)
10847 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
10848 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
10849 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
10850 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
10851 symtab_shndx_hdr
->sh_size
= amt
;
10853 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
10856 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
10857 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
10862 /* Finish up and write out the symbol string table (.strtab)
10864 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
10865 /* sh_name was set in prep_headers. */
10866 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
10867 symstrtab_hdr
->sh_flags
= 0;
10868 symstrtab_hdr
->sh_addr
= 0;
10869 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
10870 symstrtab_hdr
->sh_entsize
= 0;
10871 symstrtab_hdr
->sh_link
= 0;
10872 symstrtab_hdr
->sh_info
= 0;
10873 /* sh_offset is set just below. */
10874 symstrtab_hdr
->sh_addralign
= 1;
10876 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
10877 elf_tdata (abfd
)->next_file_pos
= off
;
10879 if (bfd_get_symcount (abfd
) > 0)
10881 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
10882 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
10886 /* Adjust the relocs to have the correct symbol indices. */
10887 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10889 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10890 if ((o
->flags
& SEC_RELOC
) == 0)
10893 if (esdo
->rel
.hdr
!= NULL
)
10894 elf_link_adjust_relocs (abfd
, &esdo
->rel
);
10895 if (esdo
->rela
.hdr
!= NULL
)
10896 elf_link_adjust_relocs (abfd
, &esdo
->rela
);
10898 /* Set the reloc_count field to 0 to prevent write_relocs from
10899 trying to swap the relocs out itself. */
10900 o
->reloc_count
= 0;
10903 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
10904 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
10906 /* If we are linking against a dynamic object, or generating a
10907 shared library, finish up the dynamic linking information. */
10910 bfd_byte
*dyncon
, *dynconend
;
10912 /* Fix up .dynamic entries. */
10913 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10914 BFD_ASSERT (o
!= NULL
);
10916 dyncon
= o
->contents
;
10917 dynconend
= o
->contents
+ o
->size
;
10918 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10920 Elf_Internal_Dyn dyn
;
10924 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10931 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
10933 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
10935 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
10936 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
10939 dyn
.d_un
.d_val
= relativecount
;
10946 name
= info
->init_function
;
10949 name
= info
->fini_function
;
10952 struct elf_link_hash_entry
*h
;
10954 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
10955 FALSE
, FALSE
, TRUE
);
10957 && (h
->root
.type
== bfd_link_hash_defined
10958 || h
->root
.type
== bfd_link_hash_defweak
))
10960 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
10961 o
= h
->root
.u
.def
.section
;
10962 if (o
->output_section
!= NULL
)
10963 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
10964 + o
->output_offset
);
10967 /* The symbol is imported from another shared
10968 library and does not apply to this one. */
10969 dyn
.d_un
.d_ptr
= 0;
10976 case DT_PREINIT_ARRAYSZ
:
10977 name
= ".preinit_array";
10979 case DT_INIT_ARRAYSZ
:
10980 name
= ".init_array";
10982 case DT_FINI_ARRAYSZ
:
10983 name
= ".fini_array";
10985 o
= bfd_get_section_by_name (abfd
, name
);
10988 (*_bfd_error_handler
)
10989 (_("%B: could not find output section %s"), abfd
, name
);
10993 (*_bfd_error_handler
)
10994 (_("warning: %s section has zero size"), name
);
10995 dyn
.d_un
.d_val
= o
->size
;
10998 case DT_PREINIT_ARRAY
:
10999 name
= ".preinit_array";
11001 case DT_INIT_ARRAY
:
11002 name
= ".init_array";
11004 case DT_FINI_ARRAY
:
11005 name
= ".fini_array";
11012 name
= ".gnu.hash";
11021 name
= ".gnu.version_d";
11024 name
= ".gnu.version_r";
11027 name
= ".gnu.version";
11029 o
= bfd_get_section_by_name (abfd
, name
);
11032 (*_bfd_error_handler
)
11033 (_("%B: could not find output section %s"), abfd
, name
);
11036 dyn
.d_un
.d_ptr
= o
->vma
;
11043 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
11047 dyn
.d_un
.d_val
= 0;
11048 dyn
.d_un
.d_ptr
= 0;
11049 for (i
= 1; i
< elf_numsections (abfd
); i
++)
11051 Elf_Internal_Shdr
*hdr
;
11053 hdr
= elf_elfsections (abfd
)[i
];
11054 if (hdr
->sh_type
== type
11055 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
11057 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
11058 dyn
.d_un
.d_val
+= hdr
->sh_size
;
11061 if (dyn
.d_un
.d_ptr
== 0
11062 || hdr
->sh_addr
< dyn
.d_un
.d_ptr
)
11063 dyn
.d_un
.d_ptr
= hdr
->sh_addr
;
11069 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
11073 /* If we have created any dynamic sections, then output them. */
11074 if (dynobj
!= NULL
)
11076 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
11079 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11080 if (info
->warn_shared_textrel
&& info
->shared
)
11082 bfd_byte
*dyncon
, *dynconend
;
11084 /* Fix up .dynamic entries. */
11085 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
11086 BFD_ASSERT (o
!= NULL
);
11088 dyncon
= o
->contents
;
11089 dynconend
= o
->contents
+ o
->size
;
11090 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
11092 Elf_Internal_Dyn dyn
;
11094 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
11096 if (dyn
.d_tag
== DT_TEXTREL
)
11098 info
->callbacks
->einfo
11099 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11105 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
11107 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11109 || o
->output_section
== bfd_abs_section_ptr
)
11111 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
11113 /* At this point, we are only interested in sections
11114 created by _bfd_elf_link_create_dynamic_sections. */
11117 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
11119 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
11121 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
11123 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
11125 /* FIXME: octets_per_byte. */
11126 if (! bfd_set_section_contents (abfd
, o
->output_section
,
11128 (file_ptr
) o
->output_offset
,
11134 /* The contents of the .dynstr section are actually in a
11136 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
11137 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
11138 || ! _bfd_elf_strtab_emit (abfd
,
11139 elf_hash_table (info
)->dynstr
))
11145 if (info
->relocatable
)
11147 bfd_boolean failed
= FALSE
;
11149 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
11154 /* If we have optimized stabs strings, output them. */
11155 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
11157 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
11161 if (info
->eh_frame_hdr
)
11163 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
11167 if (finfo
.symstrtab
!= NULL
)
11168 _bfd_stringtab_free (finfo
.symstrtab
);
11169 if (finfo
.contents
!= NULL
)
11170 free (finfo
.contents
);
11171 if (finfo
.external_relocs
!= NULL
)
11172 free (finfo
.external_relocs
);
11173 if (finfo
.internal_relocs
!= NULL
)
11174 free (finfo
.internal_relocs
);
11175 if (finfo
.external_syms
!= NULL
)
11176 free (finfo
.external_syms
);
11177 if (finfo
.locsym_shndx
!= NULL
)
11178 free (finfo
.locsym_shndx
);
11179 if (finfo
.internal_syms
!= NULL
)
11180 free (finfo
.internal_syms
);
11181 if (finfo
.indices
!= NULL
)
11182 free (finfo
.indices
);
11183 if (finfo
.sections
!= NULL
)
11184 free (finfo
.sections
);
11185 if (finfo
.symbuf
!= NULL
)
11186 free (finfo
.symbuf
);
11187 if (finfo
.symshndxbuf
!= NULL
)
11188 free (finfo
.symshndxbuf
);
11189 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11191 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11192 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11193 free (esdo
->rel
.hashes
);
11194 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11195 free (esdo
->rela
.hashes
);
11198 elf_tdata (abfd
)->linker
= TRUE
;
11202 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
11203 if (contents
== NULL
)
11204 return FALSE
; /* Bail out and fail. */
11205 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
11206 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
11213 if (finfo
.symstrtab
!= NULL
)
11214 _bfd_stringtab_free (finfo
.symstrtab
);
11215 if (finfo
.contents
!= NULL
)
11216 free (finfo
.contents
);
11217 if (finfo
.external_relocs
!= NULL
)
11218 free (finfo
.external_relocs
);
11219 if (finfo
.internal_relocs
!= NULL
)
11220 free (finfo
.internal_relocs
);
11221 if (finfo
.external_syms
!= NULL
)
11222 free (finfo
.external_syms
);
11223 if (finfo
.locsym_shndx
!= NULL
)
11224 free (finfo
.locsym_shndx
);
11225 if (finfo
.internal_syms
!= NULL
)
11226 free (finfo
.internal_syms
);
11227 if (finfo
.indices
!= NULL
)
11228 free (finfo
.indices
);
11229 if (finfo
.sections
!= NULL
)
11230 free (finfo
.sections
);
11231 if (finfo
.symbuf
!= NULL
)
11232 free (finfo
.symbuf
);
11233 if (finfo
.symshndxbuf
!= NULL
)
11234 free (finfo
.symshndxbuf
);
11235 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11237 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11238 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11239 free (esdo
->rel
.hashes
);
11240 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11241 free (esdo
->rela
.hashes
);
11247 /* Initialize COOKIE for input bfd ABFD. */
11250 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
11251 struct bfd_link_info
*info
, bfd
*abfd
)
11253 Elf_Internal_Shdr
*symtab_hdr
;
11254 const struct elf_backend_data
*bed
;
11256 bed
= get_elf_backend_data (abfd
);
11257 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11259 cookie
->abfd
= abfd
;
11260 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
11261 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
11262 if (cookie
->bad_symtab
)
11264 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11265 cookie
->extsymoff
= 0;
11269 cookie
->locsymcount
= symtab_hdr
->sh_info
;
11270 cookie
->extsymoff
= symtab_hdr
->sh_info
;
11273 if (bed
->s
->arch_size
== 32)
11274 cookie
->r_sym_shift
= 8;
11276 cookie
->r_sym_shift
= 32;
11278 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11279 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
11281 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
11282 cookie
->locsymcount
, 0,
11284 if (cookie
->locsyms
== NULL
)
11286 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
11289 if (info
->keep_memory
)
11290 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
11295 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11298 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
11300 Elf_Internal_Shdr
*symtab_hdr
;
11302 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11303 if (cookie
->locsyms
!= NULL
11304 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
11305 free (cookie
->locsyms
);
11308 /* Initialize the relocation information in COOKIE for input section SEC
11309 of input bfd ABFD. */
11312 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11313 struct bfd_link_info
*info
, bfd
*abfd
,
11316 const struct elf_backend_data
*bed
;
11318 if (sec
->reloc_count
== 0)
11320 cookie
->rels
= NULL
;
11321 cookie
->relend
= NULL
;
11325 bed
= get_elf_backend_data (abfd
);
11327 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
11328 info
->keep_memory
);
11329 if (cookie
->rels
== NULL
)
11331 cookie
->rel
= cookie
->rels
;
11332 cookie
->relend
= (cookie
->rels
11333 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
11335 cookie
->rel
= cookie
->rels
;
11339 /* Free the memory allocated by init_reloc_cookie_rels,
11343 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11346 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
11347 free (cookie
->rels
);
11350 /* Initialize the whole of COOKIE for input section SEC. */
11353 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11354 struct bfd_link_info
*info
,
11357 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
11359 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
11364 fini_reloc_cookie (cookie
, sec
->owner
);
11369 /* Free the memory allocated by init_reloc_cookie_for_section,
11373 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11376 fini_reloc_cookie_rels (cookie
, sec
);
11377 fini_reloc_cookie (cookie
, sec
->owner
);
11380 /* Garbage collect unused sections. */
11382 /* Default gc_mark_hook. */
11385 _bfd_elf_gc_mark_hook (asection
*sec
,
11386 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
11387 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
11388 struct elf_link_hash_entry
*h
,
11389 Elf_Internal_Sym
*sym
)
11391 const char *sec_name
;
11395 switch (h
->root
.type
)
11397 case bfd_link_hash_defined
:
11398 case bfd_link_hash_defweak
:
11399 return h
->root
.u
.def
.section
;
11401 case bfd_link_hash_common
:
11402 return h
->root
.u
.c
.p
->section
;
11404 case bfd_link_hash_undefined
:
11405 case bfd_link_hash_undefweak
:
11406 /* To work around a glibc bug, keep all XXX input sections
11407 when there is an as yet undefined reference to __start_XXX
11408 or __stop_XXX symbols. The linker will later define such
11409 symbols for orphan input sections that have a name
11410 representable as a C identifier. */
11411 if (strncmp (h
->root
.root
.string
, "__start_", 8) == 0)
11412 sec_name
= h
->root
.root
.string
+ 8;
11413 else if (strncmp (h
->root
.root
.string
, "__stop_", 7) == 0)
11414 sec_name
= h
->root
.root
.string
+ 7;
11418 if (sec_name
&& *sec_name
!= '\0')
11422 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
11424 sec
= bfd_get_section_by_name (i
, sec_name
);
11426 sec
->flags
|= SEC_KEEP
;
11436 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
11441 /* COOKIE->rel describes a relocation against section SEC, which is
11442 a section we've decided to keep. Return the section that contains
11443 the relocation symbol, or NULL if no section contains it. */
11446 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
11447 elf_gc_mark_hook_fn gc_mark_hook
,
11448 struct elf_reloc_cookie
*cookie
)
11450 unsigned long r_symndx
;
11451 struct elf_link_hash_entry
*h
;
11453 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
11454 if (r_symndx
== STN_UNDEF
)
11457 if (r_symndx
>= cookie
->locsymcount
11458 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11460 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
11461 while (h
->root
.type
== bfd_link_hash_indirect
11462 || h
->root
.type
== bfd_link_hash_warning
)
11463 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11464 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
11467 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
11468 &cookie
->locsyms
[r_symndx
]);
11471 /* COOKIE->rel describes a relocation against section SEC, which is
11472 a section we've decided to keep. Mark the section that contains
11473 the relocation symbol. */
11476 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
11478 elf_gc_mark_hook_fn gc_mark_hook
,
11479 struct elf_reloc_cookie
*cookie
)
11483 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
);
11484 if (rsec
&& !rsec
->gc_mark
)
11486 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
11488 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
11494 /* The mark phase of garbage collection. For a given section, mark
11495 it and any sections in this section's group, and all the sections
11496 which define symbols to which it refers. */
11499 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
11501 elf_gc_mark_hook_fn gc_mark_hook
)
11504 asection
*group_sec
, *eh_frame
;
11508 /* Mark all the sections in the group. */
11509 group_sec
= elf_section_data (sec
)->next_in_group
;
11510 if (group_sec
&& !group_sec
->gc_mark
)
11511 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
11514 /* Look through the section relocs. */
11516 eh_frame
= elf_eh_frame_section (sec
->owner
);
11517 if ((sec
->flags
& SEC_RELOC
) != 0
11518 && sec
->reloc_count
> 0
11519 && sec
!= eh_frame
)
11521 struct elf_reloc_cookie cookie
;
11523 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
11527 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
11528 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
11533 fini_reloc_cookie_for_section (&cookie
, sec
);
11537 if (ret
&& eh_frame
&& elf_fde_list (sec
))
11539 struct elf_reloc_cookie cookie
;
11541 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
11545 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
11546 gc_mark_hook
, &cookie
))
11548 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
11555 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11557 struct elf_gc_sweep_symbol_info
11559 struct bfd_link_info
*info
;
11560 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
11565 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
11567 if (h
->root
.type
== bfd_link_hash_warning
)
11568 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11570 if ((h
->root
.type
== bfd_link_hash_defined
11571 || h
->root
.type
== bfd_link_hash_defweak
)
11572 && !h
->root
.u
.def
.section
->gc_mark
11573 && !(h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
))
11575 struct elf_gc_sweep_symbol_info
*inf
=
11576 (struct elf_gc_sweep_symbol_info
*) data
;
11577 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
11583 /* The sweep phase of garbage collection. Remove all garbage sections. */
11585 typedef bfd_boolean (*gc_sweep_hook_fn
)
11586 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
11589 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
11592 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11593 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
11594 unsigned long section_sym_count
;
11595 struct elf_gc_sweep_symbol_info sweep_info
;
11597 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11601 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11604 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11606 /* When any section in a section group is kept, we keep all
11607 sections in the section group. If the first member of
11608 the section group is excluded, we will also exclude the
11610 if (o
->flags
& SEC_GROUP
)
11612 asection
*first
= elf_next_in_group (o
);
11613 o
->gc_mark
= first
->gc_mark
;
11615 else if ((o
->flags
& (SEC_DEBUGGING
| SEC_LINKER_CREATED
)) != 0
11616 || (o
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0
11617 || elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
)
11619 /* Keep debug, special and SHT_NOTE sections. */
11626 /* Skip sweeping sections already excluded. */
11627 if (o
->flags
& SEC_EXCLUDE
)
11630 /* Since this is early in the link process, it is simple
11631 to remove a section from the output. */
11632 o
->flags
|= SEC_EXCLUDE
;
11634 if (info
->print_gc_sections
&& o
->size
!= 0)
11635 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
11637 /* But we also have to update some of the relocation
11638 info we collected before. */
11640 && (o
->flags
& SEC_RELOC
) != 0
11641 && o
->reloc_count
> 0
11642 && !bfd_is_abs_section (o
->output_section
))
11644 Elf_Internal_Rela
*internal_relocs
;
11648 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
11649 info
->keep_memory
);
11650 if (internal_relocs
== NULL
)
11653 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
11655 if (elf_section_data (o
)->relocs
!= internal_relocs
)
11656 free (internal_relocs
);
11664 /* Remove the symbols that were in the swept sections from the dynamic
11665 symbol table. GCFIXME: Anyone know how to get them out of the
11666 static symbol table as well? */
11667 sweep_info
.info
= info
;
11668 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
11669 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
11672 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
11676 /* Propagate collected vtable information. This is called through
11677 elf_link_hash_traverse. */
11680 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
11682 if (h
->root
.type
== bfd_link_hash_warning
)
11683 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11685 /* Those that are not vtables. */
11686 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11689 /* Those vtables that do not have parents, we cannot merge. */
11690 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
11693 /* If we've already been done, exit. */
11694 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
11697 /* Make sure the parent's table is up to date. */
11698 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
11700 if (h
->vtable
->used
== NULL
)
11702 /* None of this table's entries were referenced. Re-use the
11704 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
11705 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
11710 bfd_boolean
*cu
, *pu
;
11712 /* Or the parent's entries into ours. */
11713 cu
= h
->vtable
->used
;
11715 pu
= h
->vtable
->parent
->vtable
->used
;
11718 const struct elf_backend_data
*bed
;
11719 unsigned int log_file_align
;
11721 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
11722 log_file_align
= bed
->s
->log_file_align
;
11723 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
11738 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
11741 bfd_vma hstart
, hend
;
11742 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
11743 const struct elf_backend_data
*bed
;
11744 unsigned int log_file_align
;
11746 if (h
->root
.type
== bfd_link_hash_warning
)
11747 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11749 /* Take care of both those symbols that do not describe vtables as
11750 well as those that are not loaded. */
11751 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11754 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
11755 || h
->root
.type
== bfd_link_hash_defweak
);
11757 sec
= h
->root
.u
.def
.section
;
11758 hstart
= h
->root
.u
.def
.value
;
11759 hend
= hstart
+ h
->size
;
11761 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
11763 return *(bfd_boolean
*) okp
= FALSE
;
11764 bed
= get_elf_backend_data (sec
->owner
);
11765 log_file_align
= bed
->s
->log_file_align
;
11767 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
11769 for (rel
= relstart
; rel
< relend
; ++rel
)
11770 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
11772 /* If the entry is in use, do nothing. */
11773 if (h
->vtable
->used
11774 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
11776 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
11777 if (h
->vtable
->used
[entry
])
11780 /* Otherwise, kill it. */
11781 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
11787 /* Mark sections containing dynamically referenced symbols. When
11788 building shared libraries, we must assume that any visible symbol is
11792 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
11794 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
11796 if (h
->root
.type
== bfd_link_hash_warning
)
11797 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11799 if ((h
->root
.type
== bfd_link_hash_defined
11800 || h
->root
.type
== bfd_link_hash_defweak
)
11802 || (!info
->executable
11804 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
11805 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
)))
11806 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11811 /* Keep all sections containing symbols undefined on the command-line,
11812 and the section containing the entry symbol. */
11815 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
11817 struct bfd_sym_chain
*sym
;
11819 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
11821 struct elf_link_hash_entry
*h
;
11823 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
11824 FALSE
, FALSE
, FALSE
);
11827 && (h
->root
.type
== bfd_link_hash_defined
11828 || h
->root
.type
== bfd_link_hash_defweak
)
11829 && !bfd_is_abs_section (h
->root
.u
.def
.section
))
11830 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11834 /* Do mark and sweep of unused sections. */
11837 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
11839 bfd_boolean ok
= TRUE
;
11841 elf_gc_mark_hook_fn gc_mark_hook
;
11842 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11844 if (!bed
->can_gc_sections
11845 || !is_elf_hash_table (info
->hash
))
11847 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
11851 bed
->gc_keep (info
);
11853 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11854 at the .eh_frame section if we can mark the FDEs individually. */
11855 _bfd_elf_begin_eh_frame_parsing (info
);
11856 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11859 struct elf_reloc_cookie cookie
;
11861 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
11862 if (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
11864 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
11865 if (elf_section_data (sec
)->sec_info
)
11866 elf_eh_frame_section (sub
) = sec
;
11867 fini_reloc_cookie_for_section (&cookie
, sec
);
11870 _bfd_elf_end_eh_frame_parsing (info
);
11872 /* Apply transitive closure to the vtable entry usage info. */
11873 elf_link_hash_traverse (elf_hash_table (info
),
11874 elf_gc_propagate_vtable_entries_used
,
11879 /* Kill the vtable relocations that were not used. */
11880 elf_link_hash_traverse (elf_hash_table (info
),
11881 elf_gc_smash_unused_vtentry_relocs
,
11886 /* Mark dynamically referenced symbols. */
11887 if (elf_hash_table (info
)->dynamic_sections_created
)
11888 elf_link_hash_traverse (elf_hash_table (info
),
11889 bed
->gc_mark_dynamic_ref
,
11892 /* Grovel through relocs to find out who stays ... */
11893 gc_mark_hook
= bed
->gc_mark_hook
;
11894 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11898 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11901 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11902 if ((o
->flags
& (SEC_EXCLUDE
| SEC_KEEP
)) == SEC_KEEP
&& !o
->gc_mark
)
11903 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
11907 /* Allow the backend to mark additional target specific sections. */
11908 if (bed
->gc_mark_extra_sections
)
11909 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
11911 /* ... and mark SEC_EXCLUDE for those that go. */
11912 return elf_gc_sweep (abfd
, info
);
11915 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11918 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
11920 struct elf_link_hash_entry
*h
,
11923 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
11924 struct elf_link_hash_entry
**search
, *child
;
11925 bfd_size_type extsymcount
;
11926 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11928 /* The sh_info field of the symtab header tells us where the
11929 external symbols start. We don't care about the local symbols at
11931 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
11932 if (!elf_bad_symtab (abfd
))
11933 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
11935 sym_hashes
= elf_sym_hashes (abfd
);
11936 sym_hashes_end
= sym_hashes
+ extsymcount
;
11938 /* Hunt down the child symbol, which is in this section at the same
11939 offset as the relocation. */
11940 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
11942 if ((child
= *search
) != NULL
11943 && (child
->root
.type
== bfd_link_hash_defined
11944 || child
->root
.type
== bfd_link_hash_defweak
)
11945 && child
->root
.u
.def
.section
== sec
11946 && child
->root
.u
.def
.value
== offset
)
11950 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
11951 abfd
, sec
, (unsigned long) offset
);
11952 bfd_set_error (bfd_error_invalid_operation
);
11956 if (!child
->vtable
)
11958 child
->vtable
= (struct elf_link_virtual_table_entry
*)
11959 bfd_zalloc (abfd
, sizeof (*child
->vtable
));
11960 if (!child
->vtable
)
11965 /* This *should* only be the absolute section. It could potentially
11966 be that someone has defined a non-global vtable though, which
11967 would be bad. It isn't worth paging in the local symbols to be
11968 sure though; that case should simply be handled by the assembler. */
11970 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
11973 child
->vtable
->parent
= h
;
11978 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
11981 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
11982 asection
*sec ATTRIBUTE_UNUSED
,
11983 struct elf_link_hash_entry
*h
,
11986 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11987 unsigned int log_file_align
= bed
->s
->log_file_align
;
11991 h
->vtable
= (struct elf_link_virtual_table_entry
*)
11992 bfd_zalloc (abfd
, sizeof (*h
->vtable
));
11997 if (addend
>= h
->vtable
->size
)
11999 size_t size
, bytes
, file_align
;
12000 bfd_boolean
*ptr
= h
->vtable
->used
;
12002 /* While the symbol is undefined, we have to be prepared to handle
12004 file_align
= 1 << log_file_align
;
12005 if (h
->root
.type
== bfd_link_hash_undefined
)
12006 size
= addend
+ file_align
;
12010 if (addend
>= size
)
12012 /* Oops! We've got a reference past the defined end of
12013 the table. This is probably a bug -- shall we warn? */
12014 size
= addend
+ file_align
;
12017 size
= (size
+ file_align
- 1) & -file_align
;
12019 /* Allocate one extra entry for use as a "done" flag for the
12020 consolidation pass. */
12021 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
12025 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
12031 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
12032 * sizeof (bfd_boolean
));
12033 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
12037 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
12042 /* And arrange for that done flag to be at index -1. */
12043 h
->vtable
->used
= ptr
+ 1;
12044 h
->vtable
->size
= size
;
12047 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
12052 struct alloc_got_off_arg
{
12054 struct bfd_link_info
*info
;
12057 /* We need a special top-level link routine to convert got reference counts
12058 to real got offsets. */
12061 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
12063 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
12064 bfd
*obfd
= gofarg
->info
->output_bfd
;
12065 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
12067 if (h
->root
.type
== bfd_link_hash_warning
)
12068 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12070 if (h
->got
.refcount
> 0)
12072 h
->got
.offset
= gofarg
->gotoff
;
12073 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
12076 h
->got
.offset
= (bfd_vma
) -1;
12081 /* And an accompanying bit to work out final got entry offsets once
12082 we're done. Should be called from final_link. */
12085 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
12086 struct bfd_link_info
*info
)
12089 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12091 struct alloc_got_off_arg gofarg
;
12093 BFD_ASSERT (abfd
== info
->output_bfd
);
12095 if (! is_elf_hash_table (info
->hash
))
12098 /* The GOT offset is relative to the .got section, but the GOT header is
12099 put into the .got.plt section, if the backend uses it. */
12100 if (bed
->want_got_plt
)
12103 gotoff
= bed
->got_header_size
;
12105 /* Do the local .got entries first. */
12106 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
12108 bfd_signed_vma
*local_got
;
12109 bfd_size_type j
, locsymcount
;
12110 Elf_Internal_Shdr
*symtab_hdr
;
12112 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
12115 local_got
= elf_local_got_refcounts (i
);
12119 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
12120 if (elf_bad_symtab (i
))
12121 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
12123 locsymcount
= symtab_hdr
->sh_info
;
12125 for (j
= 0; j
< locsymcount
; ++j
)
12127 if (local_got
[j
] > 0)
12129 local_got
[j
] = gotoff
;
12130 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
12133 local_got
[j
] = (bfd_vma
) -1;
12137 /* Then the global .got entries. .plt refcounts are handled by
12138 adjust_dynamic_symbol */
12139 gofarg
.gotoff
= gotoff
;
12140 gofarg
.info
= info
;
12141 elf_link_hash_traverse (elf_hash_table (info
),
12142 elf_gc_allocate_got_offsets
,
12147 /* Many folk need no more in the way of final link than this, once
12148 got entry reference counting is enabled. */
12151 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12153 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
12156 /* Invoke the regular ELF backend linker to do all the work. */
12157 return bfd_elf_final_link (abfd
, info
);
12161 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
12163 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
12165 if (rcookie
->bad_symtab
)
12166 rcookie
->rel
= rcookie
->rels
;
12168 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
12170 unsigned long r_symndx
;
12172 if (! rcookie
->bad_symtab
)
12173 if (rcookie
->rel
->r_offset
> offset
)
12175 if (rcookie
->rel
->r_offset
!= offset
)
12178 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
12179 if (r_symndx
== STN_UNDEF
)
12182 if (r_symndx
>= rcookie
->locsymcount
12183 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
12185 struct elf_link_hash_entry
*h
;
12187 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
12189 while (h
->root
.type
== bfd_link_hash_indirect
12190 || h
->root
.type
== bfd_link_hash_warning
)
12191 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12193 if ((h
->root
.type
== bfd_link_hash_defined
12194 || h
->root
.type
== bfd_link_hash_defweak
)
12195 && elf_discarded_section (h
->root
.u
.def
.section
))
12202 /* It's not a relocation against a global symbol,
12203 but it could be a relocation against a local
12204 symbol for a discarded section. */
12206 Elf_Internal_Sym
*isym
;
12208 /* Need to: get the symbol; get the section. */
12209 isym
= &rcookie
->locsyms
[r_symndx
];
12210 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
12211 if (isec
!= NULL
&& elf_discarded_section (isec
))
12219 /* Discard unneeded references to discarded sections.
12220 Returns TRUE if any section's size was changed. */
12221 /* This function assumes that the relocations are in sorted order,
12222 which is true for all known assemblers. */
12225 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
12227 struct elf_reloc_cookie cookie
;
12228 asection
*stab
, *eh
;
12229 const struct elf_backend_data
*bed
;
12231 bfd_boolean ret
= FALSE
;
12233 if (info
->traditional_format
12234 || !is_elf_hash_table (info
->hash
))
12237 _bfd_elf_begin_eh_frame_parsing (info
);
12238 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
12240 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
12243 bed
= get_elf_backend_data (abfd
);
12245 if ((abfd
->flags
& DYNAMIC
) != 0)
12249 if (!info
->relocatable
)
12251 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
12254 || bfd_is_abs_section (eh
->output_section
)))
12258 stab
= bfd_get_section_by_name (abfd
, ".stab");
12260 && (stab
->size
== 0
12261 || bfd_is_abs_section (stab
->output_section
)
12262 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
12267 && bed
->elf_backend_discard_info
== NULL
)
12270 if (!init_reloc_cookie (&cookie
, info
, abfd
))
12274 && stab
->reloc_count
> 0
12275 && init_reloc_cookie_rels (&cookie
, info
, abfd
, stab
))
12277 if (_bfd_discard_section_stabs (abfd
, stab
,
12278 elf_section_data (stab
)->sec_info
,
12279 bfd_elf_reloc_symbol_deleted_p
,
12282 fini_reloc_cookie_rels (&cookie
, stab
);
12286 && init_reloc_cookie_rels (&cookie
, info
, abfd
, eh
))
12288 _bfd_elf_parse_eh_frame (abfd
, info
, eh
, &cookie
);
12289 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
12290 bfd_elf_reloc_symbol_deleted_p
,
12293 fini_reloc_cookie_rels (&cookie
, eh
);
12296 if (bed
->elf_backend_discard_info
!= NULL
12297 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
12300 fini_reloc_cookie (&cookie
, abfd
);
12302 _bfd_elf_end_eh_frame_parsing (info
);
12304 if (info
->eh_frame_hdr
12305 && !info
->relocatable
12306 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
12312 /* For a SHT_GROUP section, return the group signature. For other
12313 sections, return the normal section name. */
12315 static const char *
12316 section_signature (asection
*sec
)
12318 if ((sec
->flags
& SEC_GROUP
) != 0
12319 && elf_next_in_group (sec
) != NULL
12320 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
12321 return elf_group_name (elf_next_in_group (sec
));
12326 _bfd_elf_section_already_linked (bfd
*abfd
, asection
*sec
,
12327 struct bfd_link_info
*info
)
12330 const char *name
, *p
;
12331 struct bfd_section_already_linked
*l
;
12332 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
12334 if (sec
->output_section
== bfd_abs_section_ptr
)
12337 flags
= sec
->flags
;
12339 /* Return if it isn't a linkonce section. A comdat group section
12340 also has SEC_LINK_ONCE set. */
12341 if ((flags
& SEC_LINK_ONCE
) == 0)
12344 /* Don't put group member sections on our list of already linked
12345 sections. They are handled as a group via their group section. */
12346 if (elf_sec_group (sec
) != NULL
)
12349 /* FIXME: When doing a relocatable link, we may have trouble
12350 copying relocations in other sections that refer to local symbols
12351 in the section being discarded. Those relocations will have to
12352 be converted somehow; as of this writing I'm not sure that any of
12353 the backends handle that correctly.
12355 It is tempting to instead not discard link once sections when
12356 doing a relocatable link (technically, they should be discarded
12357 whenever we are building constructors). However, that fails,
12358 because the linker winds up combining all the link once sections
12359 into a single large link once section, which defeats the purpose
12360 of having link once sections in the first place.
12362 Also, not merging link once sections in a relocatable link
12363 causes trouble for MIPS ELF, which relies on link once semantics
12364 to handle the .reginfo section correctly. */
12366 name
= section_signature (sec
);
12368 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
12369 && (p
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
12374 already_linked_list
= bfd_section_already_linked_table_lookup (p
);
12376 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12378 /* We may have 2 different types of sections on the list: group
12379 sections and linkonce sections. Match like sections. */
12380 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
12381 && strcmp (name
, section_signature (l
->sec
)) == 0
12382 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
12384 /* The section has already been linked. See if we should
12385 issue a warning. */
12386 switch (flags
& SEC_LINK_DUPLICATES
)
12391 case SEC_LINK_DUPLICATES_DISCARD
:
12394 case SEC_LINK_DUPLICATES_ONE_ONLY
:
12395 (*_bfd_error_handler
)
12396 (_("%B: ignoring duplicate section `%A'"),
12400 case SEC_LINK_DUPLICATES_SAME_SIZE
:
12401 if (sec
->size
!= l
->sec
->size
)
12402 (*_bfd_error_handler
)
12403 (_("%B: duplicate section `%A' has different size"),
12407 case SEC_LINK_DUPLICATES_SAME_CONTENTS
:
12408 if (sec
->size
!= l
->sec
->size
)
12409 (*_bfd_error_handler
)
12410 (_("%B: duplicate section `%A' has different size"),
12412 else if (sec
->size
!= 0)
12414 bfd_byte
*sec_contents
, *l_sec_contents
;
12416 if (!bfd_malloc_and_get_section (abfd
, sec
, &sec_contents
))
12417 (*_bfd_error_handler
)
12418 (_("%B: warning: could not read contents of section `%A'"),
12420 else if (!bfd_malloc_and_get_section (l
->sec
->owner
, l
->sec
,
12422 (*_bfd_error_handler
)
12423 (_("%B: warning: could not read contents of section `%A'"),
12424 l
->sec
->owner
, l
->sec
);
12425 else if (memcmp (sec_contents
, l_sec_contents
, sec
->size
) != 0)
12426 (*_bfd_error_handler
)
12427 (_("%B: warning: duplicate section `%A' has different contents"),
12431 free (sec_contents
);
12432 if (l_sec_contents
)
12433 free (l_sec_contents
);
12438 /* Set the output_section field so that lang_add_section
12439 does not create a lang_input_section structure for this
12440 section. Since there might be a symbol in the section
12441 being discarded, we must retain a pointer to the section
12442 which we are really going to use. */
12443 sec
->output_section
= bfd_abs_section_ptr
;
12444 sec
->kept_section
= l
->sec
;
12446 if (flags
& SEC_GROUP
)
12448 asection
*first
= elf_next_in_group (sec
);
12449 asection
*s
= first
;
12453 s
->output_section
= bfd_abs_section_ptr
;
12454 /* Record which group discards it. */
12455 s
->kept_section
= l
->sec
;
12456 s
= elf_next_in_group (s
);
12457 /* These lists are circular. */
12467 /* A single member comdat group section may be discarded by a
12468 linkonce section and vice versa. */
12470 if ((flags
& SEC_GROUP
) != 0)
12472 asection
*first
= elf_next_in_group (sec
);
12474 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
12475 /* Check this single member group against linkonce sections. */
12476 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12477 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12478 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
12479 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
12481 first
->output_section
= bfd_abs_section_ptr
;
12482 first
->kept_section
= l
->sec
;
12483 sec
->output_section
= bfd_abs_section_ptr
;
12488 /* Check this linkonce section against single member groups. */
12489 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12490 if (l
->sec
->flags
& SEC_GROUP
)
12492 asection
*first
= elf_next_in_group (l
->sec
);
12495 && elf_next_in_group (first
) == first
12496 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
12498 sec
->output_section
= bfd_abs_section_ptr
;
12499 sec
->kept_section
= first
;
12504 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12505 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12506 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12507 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12508 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12509 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12510 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12511 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12512 The reverse order cannot happen as there is never a bfd with only the
12513 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12514 matter as here were are looking only for cross-bfd sections. */
12516 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
12517 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12518 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12519 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
12521 if (abfd
!= l
->sec
->owner
)
12522 sec
->output_section
= bfd_abs_section_ptr
;
12526 /* This is the first section with this name. Record it. */
12527 if (! bfd_section_already_linked_table_insert (already_linked_list
, sec
))
12528 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
12532 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
12534 return sym
->st_shndx
== SHN_COMMON
;
12538 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
12544 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
12546 return bfd_com_section_ptr
;
12550 _bfd_elf_default_got_elt_size (bfd
*abfd
,
12551 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
12552 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
12553 bfd
*ibfd ATTRIBUTE_UNUSED
,
12554 unsigned long symndx ATTRIBUTE_UNUSED
)
12556 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12557 return bed
->s
->arch_size
/ 8;
12560 /* Routines to support the creation of dynamic relocs. */
12562 /* Return true if NAME is a name of a relocation
12563 section associated with section S. */
12566 is_reloc_section (bfd_boolean rela
, const char * name
, asection
* s
)
12569 return CONST_STRNEQ (name
, ".rela")
12570 && strcmp (bfd_get_section_name (NULL
, s
), name
+ 5) == 0;
12572 return CONST_STRNEQ (name
, ".rel")
12573 && strcmp (bfd_get_section_name (NULL
, s
), name
+ 4) == 0;
12576 /* Returns the name of the dynamic reloc section associated with SEC. */
12578 static const char *
12579 get_dynamic_reloc_section_name (bfd
* abfd
,
12581 bfd_boolean is_rela
)
12584 unsigned int strndx
= elf_elfheader (abfd
)->e_shstrndx
;
12585 unsigned int shnam
= _bfd_elf_single_rel_hdr (sec
)->sh_name
;
12587 name
= bfd_elf_string_from_elf_section (abfd
, strndx
, shnam
);
12591 if (! is_reloc_section (is_rela
, name
, sec
))
12593 static bfd_boolean complained
= FALSE
;
12597 (*_bfd_error_handler
)
12598 (_("%B: bad relocation section name `%s\'"), abfd
, name
);
12607 /* Returns the dynamic reloc section associated with SEC.
12608 If necessary compute the name of the dynamic reloc section based
12609 on SEC's name (looked up in ABFD's string table) and the setting
12613 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
12615 bfd_boolean is_rela
)
12617 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12619 if (reloc_sec
== NULL
)
12621 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12625 reloc_sec
= bfd_get_section_by_name (abfd
, name
);
12627 if (reloc_sec
!= NULL
)
12628 elf_section_data (sec
)->sreloc
= reloc_sec
;
12635 /* Returns the dynamic reloc section associated with SEC. If the
12636 section does not exist it is created and attached to the DYNOBJ
12637 bfd and stored in the SRELOC field of SEC's elf_section_data
12640 ALIGNMENT is the alignment for the newly created section and
12641 IS_RELA defines whether the name should be .rela.<SEC's name>
12642 or .rel.<SEC's name>. The section name is looked up in the
12643 string table associated with ABFD. */
12646 _bfd_elf_make_dynamic_reloc_section (asection
* sec
,
12648 unsigned int alignment
,
12650 bfd_boolean is_rela
)
12652 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12654 if (reloc_sec
== NULL
)
12656 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12661 reloc_sec
= bfd_get_section_by_name (dynobj
, name
);
12663 if (reloc_sec
== NULL
)
12667 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
12668 if ((sec
->flags
& SEC_ALLOC
) != 0)
12669 flags
|= SEC_ALLOC
| SEC_LOAD
;
12671 reloc_sec
= bfd_make_section_with_flags (dynobj
, name
, flags
);
12672 if (reloc_sec
!= NULL
)
12674 if (! bfd_set_section_alignment (dynobj
, reloc_sec
, alignment
))
12679 elf_section_data (sec
)->sreloc
= reloc_sec
;
12685 /* Copy the ELF symbol type associated with a linker hash entry. */
12687 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd ATTRIBUTE_UNUSED
,
12688 struct bfd_link_hash_entry
* hdest
,
12689 struct bfd_link_hash_entry
* hsrc
)
12691 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*)hdest
;
12692 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*)hsrc
;
12694 ehdest
->type
= ehsrc
->type
;