1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2023 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
30 #if BFD_SUPPORTS_PLUGINS
31 #include "plugin-api.h"
40 /* This struct is used to pass information to routines called via
41 elf_link_hash_traverse which must return failure. */
43 struct elf_info_failed
45 struct bfd_link_info
*info
;
49 /* This structure is used to pass information to
50 _bfd_elf_link_find_version_dependencies. */
52 struct elf_find_verdep_info
54 /* General link information. */
55 struct bfd_link_info
*info
;
56 /* The number of dependencies. */
58 /* Whether we had a failure. */
62 static bool _bfd_elf_fix_symbol_flags
63 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
66 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
67 unsigned long r_symndx
,
70 if (r_symndx
>= cookie
->locsymcount
71 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
73 struct elf_link_hash_entry
*h
;
75 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
77 while (h
->root
.type
== bfd_link_hash_indirect
78 || h
->root
.type
== bfd_link_hash_warning
)
79 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
81 if ((h
->root
.type
== bfd_link_hash_defined
82 || h
->root
.type
== bfd_link_hash_defweak
)
83 && discarded_section (h
->root
.u
.def
.section
))
84 return h
->root
.u
.def
.section
;
90 /* It's not a relocation against a global symbol,
91 but it could be a relocation against a local
92 symbol for a discarded section. */
94 Elf_Internal_Sym
*isym
;
96 /* Need to: get the symbol; get the section. */
97 isym
= &cookie
->locsyms
[r_symndx
];
98 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
100 && discard
? discarded_section (isec
) : 1)
106 /* Define a symbol in a dynamic linkage section. */
108 struct elf_link_hash_entry
*
109 _bfd_elf_define_linkage_sym (bfd
*abfd
,
110 struct bfd_link_info
*info
,
114 struct elf_link_hash_entry
*h
;
115 struct bfd_link_hash_entry
*bh
;
116 const struct elf_backend_data
*bed
;
118 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, false, false, false);
121 /* Zap symbol defined in an as-needed lib that wasn't linked.
122 This is a symptom of a larger problem: Absolute symbols
123 defined in shared libraries can't be overridden, because we
124 lose the link to the bfd which is via the symbol section. */
125 h
->root
.type
= bfd_link_hash_new
;
131 bed
= get_elf_backend_data (abfd
);
132 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
133 sec
, 0, NULL
, false, bed
->collect
,
136 h
= (struct elf_link_hash_entry
*) bh
;
137 BFD_ASSERT (h
!= NULL
);
140 h
->root
.linker_def
= 1;
141 h
->type
= STT_OBJECT
;
142 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
143 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
145 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
150 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
154 struct elf_link_hash_entry
*h
;
155 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
156 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
158 /* This function may be called more than once. */
159 if (htab
->sgot
!= NULL
)
162 flags
= bed
->dynamic_sec_flags
;
164 s
= bfd_make_section_anyway_with_flags (abfd
,
165 (bed
->rela_plts_and_copies_p
166 ? ".rela.got" : ".rel.got"),
167 (bed
->dynamic_sec_flags
170 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
174 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
176 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
180 if (bed
->want_got_plt
)
182 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
184 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
189 /* The first bit of the global offset table is the header. */
190 s
->size
+= bed
->got_header_size
;
192 if (bed
->want_got_sym
)
194 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
195 (or .got.plt) section. We don't do this in the linker script
196 because we don't want to define the symbol if we are not creating
197 a global offset table. */
198 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
199 "_GLOBAL_OFFSET_TABLE_");
200 elf_hash_table (info
)->hgot
= h
;
208 /* Create a strtab to hold the dynamic symbol names. */
210 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
212 struct elf_link_hash_table
*hash_table
;
214 hash_table
= elf_hash_table (info
);
215 if (hash_table
->dynobj
== NULL
)
217 /* We may not set dynobj, an input file holding linker created
218 dynamic sections to abfd, which may be a dynamic object with
219 its own dynamic sections. We need to find a normal input file
220 to hold linker created sections if possible. */
221 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
225 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
227 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
228 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
229 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
230 && !((s
= ibfd
->sections
) != NULL
231 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
237 hash_table
->dynobj
= abfd
;
240 if (hash_table
->dynstr
== NULL
)
242 hash_table
->dynstr
= _bfd_elf_strtab_init ();
243 if (hash_table
->dynstr
== NULL
)
249 /* Create some sections which will be filled in with dynamic linking
250 information. ABFD is an input file which requires dynamic sections
251 to be created. The dynamic sections take up virtual memory space
252 when the final executable is run, so we need to create them before
253 addresses are assigned to the output sections. We work out the
254 actual contents and size of these sections later. */
257 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
261 const struct elf_backend_data
*bed
;
262 struct elf_link_hash_entry
*h
;
264 if (! is_elf_hash_table (info
->hash
))
267 if (elf_hash_table (info
)->dynamic_sections_created
)
270 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
273 abfd
= elf_hash_table (info
)->dynobj
;
274 bed
= get_elf_backend_data (abfd
);
276 flags
= bed
->dynamic_sec_flags
;
278 /* A dynamically linked executable has a .interp section, but a
279 shared library does not. */
280 if (bfd_link_executable (info
) && !info
->nointerp
)
282 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
283 flags
| SEC_READONLY
);
288 /* Create sections to hold version informations. These are removed
289 if they are not needed. */
290 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
291 flags
| SEC_READONLY
);
293 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
296 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
297 flags
| SEC_READONLY
);
299 || !bfd_set_section_alignment (s
, 1))
302 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
303 flags
| SEC_READONLY
);
305 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
308 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
309 flags
| SEC_READONLY
);
311 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
313 elf_hash_table (info
)->dynsym
= s
;
315 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
316 flags
| SEC_READONLY
);
320 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
322 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
325 /* The special symbol _DYNAMIC is always set to the start of the
326 .dynamic section. We could set _DYNAMIC in a linker script, but we
327 only want to define it if we are, in fact, creating a .dynamic
328 section. We don't want to define it if there is no .dynamic
329 section, since on some ELF platforms the start up code examines it
330 to decide how to initialize the process. */
331 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
332 elf_hash_table (info
)->hdynamic
= h
;
338 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
339 flags
| SEC_READONLY
);
341 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
343 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
346 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
348 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
349 flags
| SEC_READONLY
);
351 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
353 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
354 4 32-bit words followed by variable count of 64-bit words, then
355 variable count of 32-bit words. */
356 if (bed
->s
->arch_size
== 64)
357 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
359 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
362 if (info
->enable_dt_relr
)
364 s
= bfd_make_section_anyway_with_flags (abfd
, ".relr.dyn",
365 (bed
->dynamic_sec_flags
368 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
370 elf_hash_table (info
)->srelrdyn
= s
;
373 /* Let the backend create the rest of the sections. This lets the
374 backend set the right flags. The backend will normally create
375 the .got and .plt sections. */
376 if (bed
->elf_backend_create_dynamic_sections
== NULL
377 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
380 elf_hash_table (info
)->dynamic_sections_created
= true;
385 /* Create dynamic sections when linking against a dynamic object. */
388 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
390 flagword flags
, pltflags
;
391 struct elf_link_hash_entry
*h
;
393 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
394 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
396 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
397 .rel[a].bss sections. */
398 flags
= bed
->dynamic_sec_flags
;
401 if (bed
->plt_not_loaded
)
402 /* We do not clear SEC_ALLOC here because we still want the OS to
403 allocate space for the section; it's just that there's nothing
404 to read in from the object file. */
405 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
407 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
408 if (bed
->plt_readonly
)
409 pltflags
|= SEC_READONLY
;
411 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
413 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
417 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
419 if (bed
->want_plt_sym
)
421 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
422 "_PROCEDURE_LINKAGE_TABLE_");
423 elf_hash_table (info
)->hplt
= h
;
428 s
= bfd_make_section_anyway_with_flags (abfd
,
429 (bed
->rela_plts_and_copies_p
430 ? ".rela.plt" : ".rel.plt"),
431 flags
| SEC_READONLY
);
433 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
437 if (! _bfd_elf_create_got_section (abfd
, info
))
440 if (bed
->want_dynbss
)
442 /* The .dynbss section is a place to put symbols which are defined
443 by dynamic objects, are referenced by regular objects, and are
444 not functions. We must allocate space for them in the process
445 image and use a R_*_COPY reloc to tell the dynamic linker to
446 initialize them at run time. The linker script puts the .dynbss
447 section into the .bss section of the final image. */
448 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
449 SEC_ALLOC
| SEC_LINKER_CREATED
);
454 if (bed
->want_dynrelro
)
456 /* Similarly, but for symbols that were originally in read-only
457 sections. This section doesn't really need to have contents,
458 but make it like other .data.rel.ro sections. */
459 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
466 /* The .rel[a].bss section holds copy relocs. This section is not
467 normally needed. We need to create it here, though, so that the
468 linker will map it to an output section. We can't just create it
469 only if we need it, because we will not know whether we need it
470 until we have seen all the input files, and the first time the
471 main linker code calls BFD after examining all the input files
472 (size_dynamic_sections) the input sections have already been
473 mapped to the output sections. If the section turns out not to
474 be needed, we can discard it later. We will never need this
475 section when generating a shared object, since they do not use
477 if (bfd_link_executable (info
))
479 s
= bfd_make_section_anyway_with_flags (abfd
,
480 (bed
->rela_plts_and_copies_p
481 ? ".rela.bss" : ".rel.bss"),
482 flags
| SEC_READONLY
);
484 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
488 if (bed
->want_dynrelro
)
490 s
= (bfd_make_section_anyway_with_flags
491 (abfd
, (bed
->rela_plts_and_copies_p
492 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
493 flags
| SEC_READONLY
));
495 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
497 htab
->sreldynrelro
= s
;
505 /* Record a new dynamic symbol. We record the dynamic symbols as we
506 read the input files, since we need to have a list of all of them
507 before we can determine the final sizes of the output sections.
508 Note that we may actually call this function even though we are not
509 going to output any dynamic symbols; in some cases we know that a
510 symbol should be in the dynamic symbol table, but only if there is
514 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
515 struct elf_link_hash_entry
*h
)
517 if (h
->dynindx
== -1)
519 struct elf_strtab_hash
*dynstr
;
524 if (h
->root
.type
== bfd_link_hash_defined
525 || h
->root
.type
== bfd_link_hash_defweak
)
527 /* An IR symbol should not be made dynamic. */
528 if (h
->root
.u
.def
.section
!= NULL
529 && h
->root
.u
.def
.section
->owner
!= NULL
530 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
534 /* XXX: The ABI draft says the linker must turn hidden and
535 internal symbols into STB_LOCAL symbols when producing the
536 DSO. However, if ld.so honors st_other in the dynamic table,
537 this would not be necessary. */
538 switch (ELF_ST_VISIBILITY (h
->other
))
542 if (h
->root
.type
!= bfd_link_hash_undefined
543 && h
->root
.type
!= bfd_link_hash_undefweak
)
546 if (!elf_hash_table (info
)->is_relocatable_executable
547 || ((h
->root
.type
== bfd_link_hash_defined
548 || h
->root
.type
== bfd_link_hash_defweak
)
549 && h
->root
.u
.def
.section
->owner
!= NULL
550 && h
->root
.u
.def
.section
->owner
->no_export
)
551 || (h
->root
.type
== bfd_link_hash_common
552 && h
->root
.u
.c
.p
->section
->owner
!= NULL
553 && h
->root
.u
.c
.p
->section
->owner
->no_export
))
561 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
562 ++elf_hash_table (info
)->dynsymcount
;
564 dynstr
= elf_hash_table (info
)->dynstr
;
567 /* Create a strtab to hold the dynamic symbol names. */
568 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
573 /* We don't put any version information in the dynamic string
575 name
= h
->root
.root
.string
;
576 p
= strchr (name
, ELF_VER_CHR
);
578 /* We know that the p points into writable memory. In fact,
579 there are only a few symbols that have read-only names, being
580 those like _GLOBAL_OFFSET_TABLE_ that are created specially
581 by the backends. Most symbols will have names pointing into
582 an ELF string table read from a file, or to objalloc memory. */
585 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
590 if (indx
== (size_t) -1)
592 h
->dynstr_index
= indx
;
598 /* Mark a symbol dynamic. */
601 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
602 struct elf_link_hash_entry
*h
,
603 Elf_Internal_Sym
*sym
)
605 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
607 /* It may be called more than once on the same H. */
608 if(h
->dynamic
|| bfd_link_relocatable (info
))
611 if ((info
->dynamic_data
612 && (h
->type
== STT_OBJECT
613 || h
->type
== STT_COMMON
615 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
616 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
619 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
622 /* NB: If a symbol is made dynamic by --dynamic-list, it has
624 h
->root
.non_ir_ref_dynamic
= 1;
628 /* Record an assignment to a symbol made by a linker script. We need
629 this in case some dynamic object refers to this symbol. */
632 bfd_elf_record_link_assignment (bfd
*output_bfd
,
633 struct bfd_link_info
*info
,
638 struct elf_link_hash_entry
*h
, *hv
;
639 struct elf_link_hash_table
*htab
;
640 const struct elf_backend_data
*bed
;
642 if (!is_elf_hash_table (info
->hash
))
645 htab
= elf_hash_table (info
);
646 h
= elf_link_hash_lookup (htab
, name
, !provide
, true, false);
650 if (h
->root
.type
== bfd_link_hash_warning
)
651 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
653 if (h
->versioned
== unknown
)
655 /* Set versioned if symbol version is unknown. */
656 char *version
= strrchr (name
, ELF_VER_CHR
);
659 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
660 h
->versioned
= versioned_hidden
;
662 h
->versioned
= versioned
;
666 /* Symbols defined in a linker script but not referenced anywhere
667 else will have non_elf set. */
670 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
674 switch (h
->root
.type
)
676 case bfd_link_hash_defined
:
677 case bfd_link_hash_defweak
:
678 case bfd_link_hash_common
:
680 case bfd_link_hash_undefweak
:
681 case bfd_link_hash_undefined
:
682 /* Since we're defining the symbol, don't let it seem to have not
683 been defined. record_dynamic_symbol and size_dynamic_sections
684 may depend on this. */
685 h
->root
.type
= bfd_link_hash_new
;
686 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
687 bfd_link_repair_undef_list (&htab
->root
);
689 case bfd_link_hash_new
:
691 case bfd_link_hash_indirect
:
692 /* We had a versioned symbol in a dynamic library. We make the
693 the versioned symbol point to this one. */
694 bed
= get_elf_backend_data (output_bfd
);
696 while (hv
->root
.type
== bfd_link_hash_indirect
697 || hv
->root
.type
== bfd_link_hash_warning
)
698 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
699 /* We don't need to update h->root.u since linker will set them
701 h
->root
.type
= bfd_link_hash_undefined
;
702 hv
->root
.type
= bfd_link_hash_indirect
;
703 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
704 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
711 /* If this symbol is being provided by the linker script, and it is
712 currently defined by a dynamic object, but not by a regular
713 object, then mark it as undefined so that the generic linker will
714 force the correct value. */
718 h
->root
.type
= bfd_link_hash_undefined
;
720 /* If this symbol is currently defined by a dynamic object, but not
721 by a regular object, then clear out any version information because
722 the symbol will not be associated with the dynamic object any
724 if (h
->def_dynamic
&& !h
->def_regular
)
725 h
->verinfo
.verdef
= NULL
;
727 /* Make sure this symbol is not garbage collected. */
734 bed
= get_elf_backend_data (output_bfd
);
735 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
736 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
737 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
740 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
742 if (!bfd_link_relocatable (info
)
744 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
745 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
750 || bfd_link_dll (info
)
751 || elf_hash_table (info
)->is_relocatable_executable
)
755 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
758 /* If this is a weak defined symbol, and we know a corresponding
759 real symbol from the same dynamic object, make sure the real
760 symbol is also made into a dynamic symbol. */
763 struct elf_link_hash_entry
*def
= weakdef (h
);
765 if (def
->dynindx
== -1
766 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
774 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
775 success, and 2 on a failure caused by attempting to record a symbol
776 in a discarded section, eg. a discarded link-once section symbol. */
779 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
784 struct elf_link_local_dynamic_entry
*entry
;
785 struct elf_link_hash_table
*eht
;
786 struct elf_strtab_hash
*dynstr
;
789 Elf_External_Sym_Shndx eshndx
;
790 char esym
[sizeof (Elf64_External_Sym
)];
792 if (! is_elf_hash_table (info
->hash
))
795 /* See if the entry exists already. */
796 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
797 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
800 amt
= sizeof (*entry
);
801 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
805 /* Go find the symbol, so that we can find it's name. */
806 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
807 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
809 bfd_release (input_bfd
, entry
);
813 if (entry
->isym
.st_shndx
!= SHN_UNDEF
814 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
818 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
819 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
821 /* We can still bfd_release here as nothing has done another
822 bfd_alloc. We can't do this later in this function. */
823 bfd_release (input_bfd
, entry
);
828 name
= (bfd_elf_string_from_elf_section
829 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
830 entry
->isym
.st_name
));
832 dynstr
= elf_hash_table (info
)->dynstr
;
835 /* Create a strtab to hold the dynamic symbol names. */
836 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
841 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, false);
842 if (dynstr_index
== (size_t) -1)
844 entry
->isym
.st_name
= dynstr_index
;
846 eht
= elf_hash_table (info
);
848 entry
->next
= eht
->dynlocal
;
849 eht
->dynlocal
= entry
;
850 entry
->input_bfd
= input_bfd
;
851 entry
->input_indx
= input_indx
;
854 /* Whatever binding the symbol had before, it's now local. */
856 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
858 /* The dynindx will be set at the end of size_dynamic_sections. */
863 /* Return the dynindex of a local dynamic symbol. */
866 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
870 struct elf_link_local_dynamic_entry
*e
;
872 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
873 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
878 /* This function is used to renumber the dynamic symbols, if some of
879 them are removed because they are marked as local. This is called
880 via elf_link_hash_traverse. */
883 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
886 size_t *count
= (size_t *) data
;
891 if (h
->dynindx
!= -1)
892 h
->dynindx
= ++(*count
);
898 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
899 STB_LOCAL binding. */
902 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
905 size_t *count
= (size_t *) data
;
907 if (!h
->forced_local
)
910 if (h
->dynindx
!= -1)
911 h
->dynindx
= ++(*count
);
916 /* Return true if the dynamic symbol for a given section should be
917 omitted when creating a shared library. */
919 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
920 struct bfd_link_info
*info
,
923 struct elf_link_hash_table
*htab
;
926 switch (elf_section_data (p
)->this_hdr
.sh_type
)
930 /* If sh_type is yet undecided, assume it could be
931 SHT_PROGBITS/SHT_NOBITS. */
933 htab
= elf_hash_table (info
);
934 if (htab
->text_index_section
!= NULL
)
935 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
937 return (htab
->dynobj
!= NULL
938 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
939 && ip
->output_section
== p
);
941 /* There shouldn't be section relative relocations
942 against any other section. */
949 _bfd_elf_omit_section_dynsym_all
950 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
951 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
952 asection
*p ATTRIBUTE_UNUSED
)
957 /* Assign dynsym indices. In a shared library we generate a section
958 symbol for each output section, which come first. Next come symbols
959 which have been forced to local binding. Then all of the back-end
960 allocated local dynamic syms, followed by the rest of the global
961 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
962 (This prevents the early call before elf_backend_init_index_section
963 and strip_excluded_output_sections setting dynindx for sections
964 that are stripped.) */
967 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
968 struct bfd_link_info
*info
,
969 unsigned long *section_sym_count
)
971 unsigned long dynsymcount
= 0;
972 bool do_sec
= section_sym_count
!= NULL
;
974 if (bfd_link_pic (info
)
975 || elf_hash_table (info
)->is_relocatable_executable
)
977 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
979 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
980 if ((p
->flags
& SEC_EXCLUDE
) == 0
981 && (p
->flags
& SEC_ALLOC
) != 0
982 && elf_hash_table (info
)->dynamic_relocs
983 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
987 elf_section_data (p
)->dynindx
= dynsymcount
;
990 elf_section_data (p
)->dynindx
= 0;
993 *section_sym_count
= dynsymcount
;
995 elf_link_hash_traverse (elf_hash_table (info
),
996 elf_link_renumber_local_hash_table_dynsyms
,
999 if (elf_hash_table (info
)->dynlocal
)
1001 struct elf_link_local_dynamic_entry
*p
;
1002 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
1003 p
->dynindx
= ++dynsymcount
;
1005 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
1007 elf_link_hash_traverse (elf_hash_table (info
),
1008 elf_link_renumber_hash_table_dynsyms
,
1011 /* There is an unused NULL entry at the head of the table which we
1012 must account for in our count even if the table is empty since it
1013 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
1014 .dynamic section. */
1017 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
1021 /* Merge st_other field. */
1024 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
1025 unsigned int st_other
, asection
*sec
,
1026 bool definition
, bool dynamic
)
1028 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1030 /* If st_other has a processor-specific meaning, specific
1031 code might be needed here. */
1032 if (bed
->elf_backend_merge_symbol_attribute
)
1033 (*bed
->elf_backend_merge_symbol_attribute
) (h
, st_other
, definition
,
1038 unsigned symvis
= ELF_ST_VISIBILITY (st_other
);
1039 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1041 /* Keep the most constraining visibility. Leave the remainder
1042 of the st_other field to elf_backend_merge_symbol_attribute. */
1043 if (symvis
- 1 < hvis
- 1)
1044 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1047 && ELF_ST_VISIBILITY (st_other
) != STV_DEFAULT
1048 && (sec
->flags
& SEC_READONLY
) == 0)
1049 h
->protected_def
= 1;
1052 /* This function is called when we want to merge a new symbol with an
1053 existing symbol. It handles the various cases which arise when we
1054 find a definition in a dynamic object, or when there is already a
1055 definition in a dynamic object. The new symbol is described by
1056 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1057 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1058 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1059 of an old common symbol. We set OVERRIDE if the old symbol is
1060 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1061 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1062 to change. By OK to change, we mean that we shouldn't warn if the
1063 type or size does change. */
1066 _bfd_elf_merge_symbol (bfd
*abfd
,
1067 struct bfd_link_info
*info
,
1069 Elf_Internal_Sym
*sym
,
1072 struct elf_link_hash_entry
**sym_hash
,
1075 unsigned int *pold_alignment
,
1078 bool *type_change_ok
,
1079 bool *size_change_ok
,
1082 asection
*sec
, *oldsec
;
1083 struct elf_link_hash_entry
*h
;
1084 struct elf_link_hash_entry
*hi
;
1085 struct elf_link_hash_entry
*flip
;
1088 bool newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1089 bool newweak
, oldweak
, newfunc
, oldfunc
;
1090 const struct elf_backend_data
*bed
;
1092 bool default_sym
= *matched
;
1093 struct elf_link_hash_table
*htab
;
1099 bind
= ELF_ST_BIND (sym
->st_info
);
1101 if (! bfd_is_und_section (sec
))
1102 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
1104 h
= ((struct elf_link_hash_entry
*)
1105 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
1110 bed
= get_elf_backend_data (abfd
);
1112 /* NEW_VERSION is the symbol version of the new symbol. */
1113 if (h
->versioned
!= unversioned
)
1115 /* Symbol version is unknown or versioned. */
1116 new_version
= strrchr (name
, ELF_VER_CHR
);
1119 if (h
->versioned
== unknown
)
1121 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1122 h
->versioned
= versioned_hidden
;
1124 h
->versioned
= versioned
;
1127 if (new_version
[0] == '\0')
1131 h
->versioned
= unversioned
;
1136 /* For merging, we only care about real symbols. But we need to make
1137 sure that indirect symbol dynamic flags are updated. */
1139 while (h
->root
.type
== bfd_link_hash_indirect
1140 || h
->root
.type
== bfd_link_hash_warning
)
1141 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1145 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1149 /* OLD_HIDDEN is true if the existing symbol is only visible
1150 to the symbol with the same symbol version. NEW_HIDDEN is
1151 true if the new symbol is only visible to the symbol with
1152 the same symbol version. */
1153 bool old_hidden
= h
->versioned
== versioned_hidden
;
1154 bool new_hidden
= hi
->versioned
== versioned_hidden
;
1155 if (!old_hidden
&& !new_hidden
)
1156 /* The new symbol matches the existing symbol if both
1161 /* OLD_VERSION is the symbol version of the existing
1165 if (h
->versioned
>= versioned
)
1166 old_version
= strrchr (h
->root
.root
.string
,
1171 /* The new symbol matches the existing symbol if they
1172 have the same symbol version. */
1173 *matched
= (old_version
== new_version
1174 || (old_version
!= NULL
1175 && new_version
!= NULL
1176 && strcmp (old_version
, new_version
) == 0));
1181 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1186 switch (h
->root
.type
)
1191 case bfd_link_hash_undefined
:
1192 case bfd_link_hash_undefweak
:
1193 oldbfd
= h
->root
.u
.undef
.abfd
;
1196 case bfd_link_hash_defined
:
1197 case bfd_link_hash_defweak
:
1198 oldbfd
= h
->root
.u
.def
.section
->owner
;
1199 oldsec
= h
->root
.u
.def
.section
;
1202 case bfd_link_hash_common
:
1203 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1204 oldsec
= h
->root
.u
.c
.p
->section
;
1206 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1209 if (poldbfd
&& *poldbfd
== NULL
)
1212 /* Differentiate strong and weak symbols. */
1213 newweak
= bind
== STB_WEAK
;
1214 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1215 || h
->root
.type
== bfd_link_hash_undefweak
);
1217 *pold_weak
= oldweak
;
1219 /* We have to check it for every instance since the first few may be
1220 references and not all compilers emit symbol type for undefined
1222 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1224 htab
= elf_hash_table (info
);
1226 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1227 respectively, is from a dynamic object. */
1229 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1231 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1232 syms and defined syms in dynamic libraries respectively.
1233 ref_dynamic on the other hand can be set for a symbol defined in
1234 a dynamic library, and def_dynamic may not be set; When the
1235 definition in a dynamic lib is overridden by a definition in the
1236 executable use of the symbol in the dynamic lib becomes a
1237 reference to the executable symbol. */
1240 if (bfd_is_und_section (sec
))
1242 if (bind
!= STB_WEAK
)
1244 h
->ref_dynamic_nonweak
= 1;
1245 hi
->ref_dynamic_nonweak
= 1;
1250 /* Update the existing symbol only if they match. */
1253 hi
->dynamic_def
= 1;
1257 /* If we just created the symbol, mark it as being an ELF symbol.
1258 Other than that, there is nothing to do--there is no merge issue
1259 with a newly defined symbol--so we just return. */
1261 if (h
->root
.type
== bfd_link_hash_new
)
1267 /* In cases involving weak versioned symbols, we may wind up trying
1268 to merge a symbol with itself. Catch that here, to avoid the
1269 confusion that results if we try to override a symbol with
1270 itself. The additional tests catch cases like
1271 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1272 dynamic object, which we do want to handle here. */
1274 && (newweak
|| oldweak
)
1275 && ((abfd
->flags
& DYNAMIC
) == 0
1276 || !h
->def_regular
))
1281 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1282 else if (oldsec
!= NULL
)
1284 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1285 indices used by MIPS ELF. */
1286 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1289 /* Set non_ir_ref_dynamic only when not handling DT_NEEDED entries. */
1290 if (!htab
->handling_dt_needed
1292 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
))
1294 if (newdyn
!= olddyn
)
1296 /* Handle a case where plugin_notice won't be called and thus
1297 won't set the non_ir_ref flags on the first pass over
1299 h
->root
.non_ir_ref_dynamic
= true;
1300 hi
->root
.non_ir_ref_dynamic
= true;
1302 else if ((oldbfd
->flags
& BFD_PLUGIN
) != 0
1303 && hi
->root
.type
== bfd_link_hash_indirect
)
1305 /* Change indirect symbol from IR to undefined. */
1306 hi
->root
.type
= bfd_link_hash_undefined
;
1307 hi
->root
.u
.undef
.abfd
= oldbfd
;
1311 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1312 respectively, appear to be a definition rather than reference. */
1314 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1316 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1317 && h
->root
.type
!= bfd_link_hash_undefweak
1318 && h
->root
.type
!= bfd_link_hash_common
);
1320 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1321 respectively, appear to be a function. */
1323 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1324 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1326 oldfunc
= (h
->type
!= STT_NOTYPE
1327 && bed
->is_function_type (h
->type
));
1329 if (!(newfunc
&& oldfunc
)
1330 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1331 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1332 && h
->type
!= STT_NOTYPE
1333 && (newdef
|| bfd_is_com_section (sec
))
1334 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1336 /* If creating a default indirect symbol ("foo" or "foo@") from
1337 a dynamic versioned definition ("foo@@") skip doing so if
1338 there is an existing regular definition with a different
1339 type. We don't want, for example, a "time" variable in the
1340 executable overriding a "time" function in a shared library. */
1348 /* When adding a symbol from a regular object file after we have
1349 created indirect symbols, undo the indirection and any
1356 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1357 h
->forced_local
= 0;
1361 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1363 h
->root
.type
= bfd_link_hash_undefined
;
1364 h
->root
.u
.undef
.abfd
= abfd
;
1368 h
->root
.type
= bfd_link_hash_new
;
1369 h
->root
.u
.undef
.abfd
= NULL
;
1375 /* Check TLS symbols. We don't check undefined symbols introduced
1376 by "ld -u" which have no type (and oldbfd NULL), and we don't
1377 check symbols from plugins because they also have no type. */
1379 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1380 && (abfd
->flags
& BFD_PLUGIN
) == 0
1381 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1382 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1386 asection
*ntsec
, *tsec
;
1388 if (h
->type
== STT_TLS
)
1409 /* xgettext:c-format */
1410 (_("%s: TLS definition in %pB section %pA "
1411 "mismatches non-TLS definition in %pB section %pA"),
1412 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1413 else if (!tdef
&& !ntdef
)
1415 /* xgettext:c-format */
1416 (_("%s: TLS reference in %pB "
1417 "mismatches non-TLS reference in %pB"),
1418 h
->root
.root
.string
, tbfd
, ntbfd
);
1421 /* xgettext:c-format */
1422 (_("%s: TLS definition in %pB section %pA "
1423 "mismatches non-TLS reference in %pB"),
1424 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1427 /* xgettext:c-format */
1428 (_("%s: TLS reference in %pB "
1429 "mismatches non-TLS definition in %pB section %pA"),
1430 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1432 bfd_set_error (bfd_error_bad_value
);
1436 /* If the old symbol has non-default visibility, we ignore the new
1437 definition from a dynamic object. */
1439 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1440 && !bfd_is_und_section (sec
))
1443 /* Make sure this symbol is dynamic. */
1445 hi
->ref_dynamic
= 1;
1446 /* A protected symbol has external availability. Make sure it is
1447 recorded as dynamic.
1449 FIXME: Should we check type and size for protected symbol? */
1450 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1451 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1456 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1459 /* If the new symbol with non-default visibility comes from a
1460 relocatable file and the old definition comes from a dynamic
1461 object, we remove the old definition. */
1462 if (hi
->root
.type
== bfd_link_hash_indirect
)
1464 /* Handle the case where the old dynamic definition is
1465 default versioned. We need to copy the symbol info from
1466 the symbol with default version to the normal one if it
1467 was referenced before. */
1470 hi
->root
.type
= h
->root
.type
;
1471 h
->root
.type
= bfd_link_hash_indirect
;
1472 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1474 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1475 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1477 /* If the new symbol is hidden or internal, completely undo
1478 any dynamic link state. */
1479 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1480 h
->forced_local
= 0;
1487 /* FIXME: Should we check type and size for protected symbol? */
1497 /* If the old symbol was undefined before, then it will still be
1498 on the undefs list. If the new symbol is undefined or
1499 common, we can't make it bfd_link_hash_new here, because new
1500 undefined or common symbols will be added to the undefs list
1501 by _bfd_generic_link_add_one_symbol. Symbols may not be
1502 added twice to the undefs list. Also, if the new symbol is
1503 undefweak then we don't want to lose the strong undef. */
1504 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1506 h
->root
.type
= bfd_link_hash_undefined
;
1507 h
->root
.u
.undef
.abfd
= abfd
;
1511 h
->root
.type
= bfd_link_hash_new
;
1512 h
->root
.u
.undef
.abfd
= NULL
;
1515 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1517 /* If the new symbol is hidden or internal, completely undo
1518 any dynamic link state. */
1519 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1520 h
->forced_local
= 0;
1526 /* FIXME: Should we check type and size for protected symbol? */
1532 /* If a new weak symbol definition comes from a regular file and the
1533 old symbol comes from a dynamic library, we treat the new one as
1534 strong. Similarly, an old weak symbol definition from a regular
1535 file is treated as strong when the new symbol comes from a dynamic
1536 library. Further, an old weak symbol from a dynamic library is
1537 treated as strong if the new symbol is from a dynamic library.
1538 This reflects the way glibc's ld.so works.
1540 Also allow a weak symbol to override a linker script symbol
1541 defined by an early pass over the script. This is done so the
1542 linker knows the symbol is defined in an object file, for the
1543 DEFINED script function.
1545 Do this before setting *type_change_ok or *size_change_ok so that
1546 we warn properly when dynamic library symbols are overridden. */
1548 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1550 if (olddef
&& newdyn
)
1553 /* Allow changes between different types of function symbol. */
1554 if (newfunc
&& oldfunc
)
1555 *type_change_ok
= true;
1557 /* It's OK to change the type if either the existing symbol or the
1558 new symbol is weak. A type change is also OK if the old symbol
1559 is undefined and the new symbol is defined. */
1564 && h
->root
.type
== bfd_link_hash_undefined
))
1565 *type_change_ok
= true;
1567 /* It's OK to change the size if either the existing symbol or the
1568 new symbol is weak, or if the old symbol is undefined. */
1571 || h
->root
.type
== bfd_link_hash_undefined
)
1572 *size_change_ok
= true;
1574 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1575 symbol, respectively, appears to be a common symbol in a dynamic
1576 object. If a symbol appears in an uninitialized section, and is
1577 not weak, and is not a function, then it may be a common symbol
1578 which was resolved when the dynamic object was created. We want
1579 to treat such symbols specially, because they raise special
1580 considerations when setting the symbol size: if the symbol
1581 appears as a common symbol in a regular object, and the size in
1582 the regular object is larger, we must make sure that we use the
1583 larger size. This problematic case can always be avoided in C,
1584 but it must be handled correctly when using Fortran shared
1587 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1588 likewise for OLDDYNCOMMON and OLDDEF.
1590 Note that this test is just a heuristic, and that it is quite
1591 possible to have an uninitialized symbol in a shared object which
1592 is really a definition, rather than a common symbol. This could
1593 lead to some minor confusion when the symbol really is a common
1594 symbol in some regular object. However, I think it will be
1600 && (sec
->flags
& SEC_ALLOC
) != 0
1601 && (sec
->flags
& SEC_LOAD
) == 0
1604 newdyncommon
= true;
1606 newdyncommon
= false;
1610 && h
->root
.type
== bfd_link_hash_defined
1612 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1613 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1616 olddyncommon
= true;
1618 olddyncommon
= false;
1620 /* We now know everything about the old and new symbols. We ask the
1621 backend to check if we can merge them. */
1622 if (bed
->merge_symbol
!= NULL
)
1624 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1629 /* There are multiple definitions of a normal symbol. Skip the
1630 default symbol as well as definition from an IR object. */
1631 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1632 && !default_sym
&& h
->def_regular
1634 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1635 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1637 /* Handle a multiple definition. */
1638 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1639 abfd
, sec
, *pvalue
);
1644 /* If both the old and the new symbols look like common symbols in a
1645 dynamic object, set the size of the symbol to the larger of the
1650 && sym
->st_size
!= h
->size
)
1652 /* Since we think we have two common symbols, issue a multiple
1653 common warning if desired. Note that we only warn if the
1654 size is different. If the size is the same, we simply let
1655 the old symbol override the new one as normally happens with
1656 symbols defined in dynamic objects. */
1658 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1659 bfd_link_hash_common
, sym
->st_size
);
1660 if (sym
->st_size
> h
->size
)
1661 h
->size
= sym
->st_size
;
1663 *size_change_ok
= true;
1666 /* If we are looking at a dynamic object, and we have found a
1667 definition, we need to see if the symbol was already defined by
1668 some other object. If so, we want to use the existing
1669 definition, and we do not want to report a multiple symbol
1670 definition error; we do this by clobbering *PSEC to be
1671 bfd_und_section_ptr.
1673 We treat a common symbol as a definition if the symbol in the
1674 shared library is a function, since common symbols always
1675 represent variables; this can cause confusion in principle, but
1676 any such confusion would seem to indicate an erroneous program or
1677 shared library. We also permit a common symbol in a regular
1678 object to override a weak symbol in a shared object. */
1683 || (h
->root
.type
== bfd_link_hash_common
1684 && (newweak
|| newfunc
))))
1688 newdyncommon
= false;
1690 *psec
= sec
= bfd_und_section_ptr
;
1691 *size_change_ok
= true;
1693 /* If we get here when the old symbol is a common symbol, then
1694 we are explicitly letting it override a weak symbol or
1695 function in a dynamic object, and we don't want to warn about
1696 a type change. If the old symbol is a defined symbol, a type
1697 change warning may still be appropriate. */
1699 if (h
->root
.type
== bfd_link_hash_common
)
1700 *type_change_ok
= true;
1703 /* Handle the special case of an old common symbol merging with a
1704 new symbol which looks like a common symbol in a shared object.
1705 We change *PSEC and *PVALUE to make the new symbol look like a
1706 common symbol, and let _bfd_generic_link_add_one_symbol do the
1710 && h
->root
.type
== bfd_link_hash_common
)
1714 newdyncommon
= false;
1715 *pvalue
= sym
->st_size
;
1716 *psec
= sec
= bed
->common_section (oldsec
);
1717 *size_change_ok
= true;
1720 /* Skip weak definitions of symbols that are already defined. */
1721 if (newdef
&& olddef
&& newweak
)
1723 /* Don't skip new non-IR weak syms. */
1724 if (!(oldbfd
!= NULL
1725 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1726 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1732 /* Merge st_other. If the symbol already has a dynamic index,
1733 but visibility says it should not be visible, turn it into a
1735 elf_merge_st_other (abfd
, h
, sym
->st_other
, sec
, newdef
, newdyn
);
1736 if (h
->dynindx
!= -1)
1737 switch (ELF_ST_VISIBILITY (h
->other
))
1741 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1746 /* If the old symbol is from a dynamic object, and the new symbol is
1747 a definition which is not from a dynamic object, then the new
1748 symbol overrides the old symbol. Symbols from regular files
1749 always take precedence over symbols from dynamic objects, even if
1750 they are defined after the dynamic object in the link.
1752 As above, we again permit a common symbol in a regular object to
1753 override a definition in a shared object if the shared object
1754 symbol is a function or is weak. */
1759 || (bfd_is_com_section (sec
)
1760 && (oldweak
|| oldfunc
)))
1765 /* Change the hash table entry to undefined, and let
1766 _bfd_generic_link_add_one_symbol do the right thing with the
1769 h
->root
.type
= bfd_link_hash_undefined
;
1770 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1771 *size_change_ok
= true;
1774 olddyncommon
= false;
1776 /* We again permit a type change when a common symbol may be
1777 overriding a function. */
1779 if (bfd_is_com_section (sec
))
1783 /* If a common symbol overrides a function, make sure
1784 that it isn't defined dynamically nor has type
1787 h
->type
= STT_NOTYPE
;
1789 *type_change_ok
= true;
1792 if (hi
->root
.type
== bfd_link_hash_indirect
)
1795 /* This union may have been set to be non-NULL when this symbol
1796 was seen in a dynamic object. We must force the union to be
1797 NULL, so that it is correct for a regular symbol. */
1798 h
->verinfo
.vertree
= NULL
;
1801 /* Handle the special case of a new common symbol merging with an
1802 old symbol that looks like it might be a common symbol defined in
1803 a shared object. Note that we have already handled the case in
1804 which a new common symbol should simply override the definition
1805 in the shared library. */
1808 && bfd_is_com_section (sec
)
1811 /* It would be best if we could set the hash table entry to a
1812 common symbol, but we don't know what to use for the section
1813 or the alignment. */
1814 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1815 bfd_link_hash_common
, sym
->st_size
);
1817 /* If the presumed common symbol in the dynamic object is
1818 larger, pretend that the new symbol has its size. */
1820 if (h
->size
> *pvalue
)
1823 /* We need to remember the alignment required by the symbol
1824 in the dynamic object. */
1825 BFD_ASSERT (pold_alignment
);
1826 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1829 olddyncommon
= false;
1831 h
->root
.type
= bfd_link_hash_undefined
;
1832 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1834 *size_change_ok
= true;
1835 *type_change_ok
= true;
1837 if (hi
->root
.type
== bfd_link_hash_indirect
)
1840 h
->verinfo
.vertree
= NULL
;
1845 /* Handle the case where we had a versioned symbol in a dynamic
1846 library and now find a definition in a normal object. In this
1847 case, we make the versioned symbol point to the normal one. */
1848 flip
->root
.type
= h
->root
.type
;
1849 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1850 h
->root
.type
= bfd_link_hash_indirect
;
1851 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1852 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1856 flip
->ref_dynamic
= 1;
1863 /* This function is called to create an indirect symbol from the
1864 default for the symbol with the default version if needed. The
1865 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1866 set DYNSYM if the new indirect symbol is dynamic. */
1869 _bfd_elf_add_default_symbol (bfd
*abfd
,
1870 struct bfd_link_info
*info
,
1871 struct elf_link_hash_entry
*h
,
1873 Elf_Internal_Sym
*sym
,
1879 bool type_change_ok
;
1880 bool size_change_ok
;
1883 struct elf_link_hash_entry
*hi
;
1884 struct bfd_link_hash_entry
*bh
;
1885 const struct elf_backend_data
*bed
;
1890 size_t len
, shortlen
;
1894 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1897 /* If this symbol has a version, and it is the default version, we
1898 create an indirect symbol from the default name to the fully
1899 decorated name. This will cause external references which do not
1900 specify a version to be bound to this version of the symbol. */
1901 p
= strchr (name
, ELF_VER_CHR
);
1902 if (h
->versioned
== unknown
)
1906 h
->versioned
= unversioned
;
1911 if (p
[1] != ELF_VER_CHR
)
1913 h
->versioned
= versioned_hidden
;
1917 h
->versioned
= versioned
;
1922 /* PR ld/19073: We may see an unversioned definition after the
1928 bed
= get_elf_backend_data (abfd
);
1929 collect
= bed
->collect
;
1930 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1932 shortlen
= p
- name
;
1933 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1934 if (shortname
== NULL
)
1936 memcpy (shortname
, name
, shortlen
);
1937 shortname
[shortlen
] = '\0';
1939 /* We are going to create a new symbol. Merge it with any existing
1940 symbol with this name. For the purposes of the merge, act as
1941 though we were defining the symbol we just defined, although we
1942 actually going to define an indirect symbol. */
1943 type_change_ok
= false;
1944 size_change_ok
= false;
1947 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1948 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1949 &type_change_ok
, &size_change_ok
, &matched
))
1955 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1957 /* If the undecorated symbol will have a version added by a
1958 script different to H, then don't indirect to/from the
1959 undecorated symbol. This isn't ideal because we may not yet
1960 have seen symbol versions, if given by a script on the
1961 command line rather than via --version-script. */
1962 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1967 = bfd_find_version_for_sym (info
->version_info
,
1968 hi
->root
.root
.string
, &hide
);
1969 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1971 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
1975 if (hi
->verinfo
.vertree
!= NULL
1976 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1982 /* Add the default symbol if not performing a relocatable link. */
1983 if (! bfd_link_relocatable (info
))
1986 if (bh
->type
== bfd_link_hash_defined
1987 && bh
->u
.def
.section
->owner
!= NULL
1988 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1990 /* Mark the previous definition from IR object as
1991 undefined so that the generic linker will override
1993 bh
->type
= bfd_link_hash_undefined
;
1994 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1996 if (! (_bfd_generic_link_add_one_symbol
1997 (info
, abfd
, shortname
, BSF_INDIRECT
,
1998 bfd_ind_section_ptr
,
1999 0, name
, false, collect
, &bh
)))
2001 hi
= (struct elf_link_hash_entry
*) bh
;
2006 /* In this case the symbol named SHORTNAME is overriding the
2007 indirect symbol we want to add. We were planning on making
2008 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
2009 is the name without a version. NAME is the fully versioned
2010 name, and it is the default version.
2012 Overriding means that we already saw a definition for the
2013 symbol SHORTNAME in a regular object, and it is overriding
2014 the symbol defined in the dynamic object.
2016 When this happens, we actually want to change NAME, the
2017 symbol we just added, to refer to SHORTNAME. This will cause
2018 references to NAME in the shared object to become references
2019 to SHORTNAME in the regular object. This is what we expect
2020 when we override a function in a shared object: that the
2021 references in the shared object will be mapped to the
2022 definition in the regular object. */
2024 while (hi
->root
.type
== bfd_link_hash_indirect
2025 || hi
->root
.type
== bfd_link_hash_warning
)
2026 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2028 h
->root
.type
= bfd_link_hash_indirect
;
2029 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
2033 hi
->ref_dynamic
= 1;
2037 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
2042 /* Now set HI to H, so that the following code will set the
2043 other fields correctly. */
2047 /* Check if HI is a warning symbol. */
2048 if (hi
->root
.type
== bfd_link_hash_warning
)
2049 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2051 /* If there is a duplicate definition somewhere, then HI may not
2052 point to an indirect symbol. We will have reported an error to
2053 the user in that case. */
2055 if (hi
->root
.type
== bfd_link_hash_indirect
)
2057 struct elf_link_hash_entry
*ht
;
2059 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2060 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2062 /* If we first saw a reference to SHORTNAME with non-default
2063 visibility, merge that visibility to the @@VER symbol. */
2064 elf_merge_st_other (abfd
, ht
, hi
->other
, sec
, true, dynamic
);
2066 /* A reference to the SHORTNAME symbol from a dynamic library
2067 will be satisfied by the versioned symbol at runtime. In
2068 effect, we have a reference to the versioned symbol. */
2069 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2070 hi
->dynamic_def
|= ht
->dynamic_def
;
2072 /* See if the new flags lead us to realize that the symbol must
2078 if (! bfd_link_executable (info
)
2085 if (hi
->ref_regular
)
2091 /* We also need to define an indirection from the nondefault version
2095 len
= strlen (name
);
2096 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2097 if (shortname
== NULL
)
2099 memcpy (shortname
, name
, shortlen
);
2100 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2102 /* Once again, merge with any existing symbol. */
2103 type_change_ok
= false;
2104 size_change_ok
= false;
2106 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2107 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2108 &type_change_ok
, &size_change_ok
, &matched
))
2114 && h
->root
.type
== bfd_link_hash_defweak
2115 && hi
->root
.type
== bfd_link_hash_defined
)
2117 /* We are handling a weak sym@@ver and attempting to define
2118 a weak sym@ver, but _bfd_elf_merge_symbol said to skip the
2119 new weak sym@ver because there is already a strong sym@ver.
2120 However, sym@ver and sym@@ver are really the same symbol.
2121 The existing strong sym@ver ought to override sym@@ver. */
2122 h
->root
.type
= bfd_link_hash_defined
;
2123 h
->root
.u
.def
.section
= hi
->root
.u
.def
.section
;
2124 h
->root
.u
.def
.value
= hi
->root
.u
.def
.value
;
2125 hi
->root
.type
= bfd_link_hash_indirect
;
2126 hi
->root
.u
.i
.link
= &h
->root
;
2133 /* Here SHORTNAME is a versioned name, so we don't expect to see
2134 the type of override we do in the case above unless it is
2135 overridden by a versioned definition. */
2136 if (hi
->root
.type
!= bfd_link_hash_defined
2137 && hi
->root
.type
!= bfd_link_hash_defweak
)
2139 /* xgettext:c-format */
2140 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2147 if (! (_bfd_generic_link_add_one_symbol
2148 (info
, abfd
, shortname
, BSF_INDIRECT
,
2149 bfd_ind_section_ptr
, 0, name
, false, collect
, &bh
)))
2151 hi
= (struct elf_link_hash_entry
*) bh
;
2154 /* If there is a duplicate definition somewhere, then HI may not
2155 point to an indirect symbol. We will have reported an error
2156 to the user in that case. */
2157 if (hi
->root
.type
== bfd_link_hash_indirect
)
2159 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2160 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2161 hi
->dynamic_def
|= h
->dynamic_def
;
2163 /* If we first saw a reference to @VER symbol with
2164 non-default visibility, merge that visibility to the
2166 elf_merge_st_other (abfd
, h
, hi
->other
, sec
, true, dynamic
);
2168 /* See if the new flags lead us to realize that the symbol
2174 if (! bfd_link_executable (info
)
2180 if (hi
->ref_regular
)
2189 /* This routine is used to export all defined symbols into the dynamic
2190 symbol table. It is called via elf_link_hash_traverse. */
2193 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2195 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2197 /* Ignore indirect symbols. These are added by the versioning code. */
2198 if (h
->root
.type
== bfd_link_hash_indirect
)
2201 /* Ignore this if we won't export it. */
2202 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2205 if (h
->dynindx
== -1
2206 && (h
->def_regular
|| h
->ref_regular
)
2207 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2208 h
->root
.root
.string
))
2210 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2220 /* Return true if GLIBC_ABI_DT_RELR is added to the list of version
2221 dependencies successfully. GLIBC_ABI_DT_RELR will be put into the
2222 .gnu.version_r section. */
2225 elf_link_add_dt_relr_dependency (struct elf_find_verdep_info
*rinfo
)
2227 bfd
*glibc_bfd
= NULL
;
2228 Elf_Internal_Verneed
*t
;
2229 Elf_Internal_Vernaux
*a
;
2231 const char *relr
= "GLIBC_ABI_DT_RELR";
2233 /* See if we already know about GLIBC_PRIVATE_DT_RELR. */
2234 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2238 const char *soname
= bfd_elf_get_dt_soname (t
->vn_bfd
);
2239 /* Skip the shared library if it isn't libc.so. */
2240 if (!soname
|| !startswith (soname
, "libc.so."))
2243 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2245 /* Return if GLIBC_PRIVATE_DT_RELR dependency has been
2247 if (a
->vna_nodename
== relr
2248 || strcmp (a
->vna_nodename
, relr
) == 0)
2251 /* Check if libc.so provides GLIBC_2.XX version. */
2252 if (!glibc_bfd
&& startswith (a
->vna_nodename
, "GLIBC_2."))
2253 glibc_bfd
= t
->vn_bfd
;
2259 /* Skip if it isn't linked against glibc. */
2260 if (glibc_bfd
== NULL
)
2263 /* This is a new version. Add it to tree we are building. */
2267 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
,
2271 rinfo
->failed
= true;
2275 t
->vn_bfd
= glibc_bfd
;
2276 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2277 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2281 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2284 rinfo
->failed
= true;
2288 a
->vna_nodename
= relr
;
2290 a
->vna_nextptr
= t
->vn_auxptr
;
2291 a
->vna_other
= rinfo
->vers
+ 1;
2299 /* Look through the symbols which are defined in other shared
2300 libraries and referenced here. Update the list of version
2301 dependencies. This will be put into the .gnu.version_r section.
2302 This function is called via elf_link_hash_traverse. */
2305 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2308 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2309 Elf_Internal_Verneed
*t
;
2310 Elf_Internal_Vernaux
*a
;
2313 /* We only care about symbols defined in shared objects with version
2318 || h
->verinfo
.verdef
== NULL
2319 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2320 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2323 /* See if we already know about this version. */
2324 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2328 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2331 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2332 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2338 /* This is a new version. Add it to tree we are building. */
2343 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2346 rinfo
->failed
= true;
2350 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2351 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2352 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2356 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2359 rinfo
->failed
= true;
2363 /* Note that we are copying a string pointer here, and testing it
2364 above. If bfd_elf_string_from_elf_section is ever changed to
2365 discard the string data when low in memory, this will have to be
2367 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2369 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2370 a
->vna_nextptr
= t
->vn_auxptr
;
2372 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2375 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2382 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2383 hidden. Set *T_P to NULL if there is no match. */
2386 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2387 struct elf_link_hash_entry
*h
,
2388 const char *version_p
,
2389 struct bfd_elf_version_tree
**t_p
,
2392 struct bfd_elf_version_tree
*t
;
2394 /* Look for the version. If we find it, it is no longer weak. */
2395 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2397 if (strcmp (t
->name
, version_p
) == 0)
2401 struct bfd_elf_version_expr
*d
;
2403 len
= version_p
- h
->root
.root
.string
;
2404 alc
= (char *) bfd_malloc (len
);
2407 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2408 alc
[len
- 1] = '\0';
2409 if (alc
[len
- 2] == ELF_VER_CHR
)
2410 alc
[len
- 2] = '\0';
2412 h
->verinfo
.vertree
= t
;
2416 if (t
->globals
.list
!= NULL
)
2417 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2419 /* See if there is anything to force this symbol to
2421 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2423 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2426 && ! info
->export_dynamic
)
2440 /* Return TRUE if the symbol H is hidden by version script. */
2443 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2444 struct elf_link_hash_entry
*h
)
2448 const struct elf_backend_data
*bed
2449 = get_elf_backend_data (info
->output_bfd
);
2451 /* Version script only hides symbols defined in regular objects. */
2452 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2455 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2456 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2458 struct bfd_elf_version_tree
*t
;
2461 if (*p
== ELF_VER_CHR
)
2465 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2469 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2474 /* If we don't have a version for this symbol, see if we can find
2476 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2479 = bfd_find_version_for_sym (info
->version_info
,
2480 h
->root
.root
.string
, &hide
);
2481 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2483 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2491 /* Figure out appropriate versions for all the symbols. We may not
2492 have the version number script until we have read all of the input
2493 files, so until that point we don't know which symbols should be
2494 local. This function is called via elf_link_hash_traverse. */
2497 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2499 struct elf_info_failed
*sinfo
;
2500 struct bfd_link_info
*info
;
2501 const struct elf_backend_data
*bed
;
2502 struct elf_info_failed eif
;
2506 sinfo
= (struct elf_info_failed
*) data
;
2509 /* Fix the symbol flags. */
2512 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2515 sinfo
->failed
= true;
2519 bed
= get_elf_backend_data (info
->output_bfd
);
2521 /* We only need version numbers for symbols defined in regular
2523 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2525 /* Hide symbols defined in discarded input sections. */
2526 if ((h
->root
.type
== bfd_link_hash_defined
2527 || h
->root
.type
== bfd_link_hash_defweak
)
2528 && discarded_section (h
->root
.u
.def
.section
))
2529 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2534 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2535 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2537 struct bfd_elf_version_tree
*t
;
2540 if (*p
== ELF_VER_CHR
)
2543 /* If there is no version string, we can just return out. */
2547 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2549 sinfo
->failed
= true;
2554 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2556 /* If we are building an application, we need to create a
2557 version node for this version. */
2558 if (t
== NULL
&& bfd_link_executable (info
))
2560 struct bfd_elf_version_tree
**pp
;
2563 /* If we aren't going to export this symbol, we don't need
2564 to worry about it. */
2565 if (h
->dynindx
== -1)
2568 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2572 sinfo
->failed
= true;
2577 t
->name_indx
= (unsigned int) -1;
2581 /* Don't count anonymous version tag. */
2582 if (sinfo
->info
->version_info
!= NULL
2583 && sinfo
->info
->version_info
->vernum
== 0)
2585 for (pp
= &sinfo
->info
->version_info
;
2589 t
->vernum
= version_index
;
2593 h
->verinfo
.vertree
= t
;
2597 /* We could not find the version for a symbol when
2598 generating a shared archive. Return an error. */
2600 /* xgettext:c-format */
2601 (_("%pB: version node not found for symbol %s"),
2602 info
->output_bfd
, h
->root
.root
.string
);
2603 bfd_set_error (bfd_error_bad_value
);
2604 sinfo
->failed
= true;
2609 /* If we don't have a version for this symbol, see if we can find
2612 && h
->verinfo
.vertree
== NULL
2613 && sinfo
->info
->version_info
!= NULL
)
2616 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2617 h
->root
.root
.string
, &hide
);
2618 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2619 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2625 /* Read and swap the relocs from the section indicated by SHDR. This
2626 may be either a REL or a RELA section. The relocations are
2627 translated into RELA relocations and stored in INTERNAL_RELOCS,
2628 which should have already been allocated to contain enough space.
2629 The EXTERNAL_RELOCS are a buffer where the external form of the
2630 relocations should be stored.
2632 Returns FALSE if something goes wrong. */
2635 elf_link_read_relocs_from_section (bfd
*abfd
,
2637 Elf_Internal_Shdr
*shdr
,
2638 void *external_relocs
,
2639 Elf_Internal_Rela
*internal_relocs
)
2641 const struct elf_backend_data
*bed
;
2642 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2643 const bfd_byte
*erela
;
2644 const bfd_byte
*erelaend
;
2645 Elf_Internal_Rela
*irela
;
2646 Elf_Internal_Shdr
*symtab_hdr
;
2649 /* Position ourselves at the start of the section. */
2650 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2653 /* Read the relocations. */
2654 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2657 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2658 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2660 bed
= get_elf_backend_data (abfd
);
2662 /* Convert the external relocations to the internal format. */
2663 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2664 swap_in
= bed
->s
->swap_reloc_in
;
2665 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2666 swap_in
= bed
->s
->swap_reloca_in
;
2669 bfd_set_error (bfd_error_wrong_format
);
2673 erela
= (const bfd_byte
*) external_relocs
;
2674 /* Setting erelaend like this and comparing with <= handles case of
2675 a fuzzed object with sh_size not a multiple of sh_entsize. */
2676 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2677 irela
= internal_relocs
;
2678 while (erela
<= erelaend
)
2682 (*swap_in
) (abfd
, erela
, irela
);
2683 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2684 if (bed
->s
->arch_size
== 64)
2688 if ((size_t) r_symndx
>= nsyms
)
2691 /* xgettext:c-format */
2692 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2693 " for offset %#" PRIx64
" in section `%pA'"),
2694 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2695 (uint64_t) irela
->r_offset
, sec
);
2696 bfd_set_error (bfd_error_bad_value
);
2700 else if (r_symndx
!= STN_UNDEF
)
2703 /* xgettext:c-format */
2704 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2705 " for offset %#" PRIx64
" in section `%pA'"
2706 " when the object file has no symbol table"),
2707 abfd
, (uint64_t) r_symndx
,
2708 (uint64_t) irela
->r_offset
, sec
);
2709 bfd_set_error (bfd_error_bad_value
);
2712 irela
+= bed
->s
->int_rels_per_ext_rel
;
2713 erela
+= shdr
->sh_entsize
;
2719 /* Read and swap the relocs for a section O. They may have been
2720 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2721 not NULL, they are used as buffers to read into. They are known to
2722 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2723 the return value is allocated using either malloc or bfd_alloc,
2724 according to the KEEP_MEMORY argument. If O has two relocation
2725 sections (both REL and RELA relocations), then the REL_HDR
2726 relocations will appear first in INTERNAL_RELOCS, followed by the
2727 RELA_HDR relocations. If INFO isn't NULL and KEEP_MEMORY is true,
2728 update cache_size. */
2731 _bfd_elf_link_info_read_relocs (bfd
*abfd
,
2732 struct bfd_link_info
*info
,
2734 void *external_relocs
,
2735 Elf_Internal_Rela
*internal_relocs
,
2738 void *alloc1
= NULL
;
2739 Elf_Internal_Rela
*alloc2
= NULL
;
2740 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2741 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2742 Elf_Internal_Rela
*internal_rela_relocs
;
2744 if (esdo
->relocs
!= NULL
)
2745 return esdo
->relocs
;
2747 if (o
->reloc_count
== 0)
2750 if (internal_relocs
== NULL
)
2754 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2757 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2759 info
->cache_size
+= size
;
2762 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2763 if (internal_relocs
== NULL
)
2767 if (external_relocs
== NULL
)
2769 bfd_size_type size
= 0;
2772 size
+= esdo
->rel
.hdr
->sh_size
;
2774 size
+= esdo
->rela
.hdr
->sh_size
;
2776 alloc1
= bfd_malloc (size
);
2779 external_relocs
= alloc1
;
2782 internal_rela_relocs
= internal_relocs
;
2785 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2789 external_relocs
= (((bfd_byte
*) external_relocs
)
2790 + esdo
->rel
.hdr
->sh_size
);
2791 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2792 * bed
->s
->int_rels_per_ext_rel
);
2796 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2798 internal_rela_relocs
)))
2801 /* Cache the results for next time, if we can. */
2803 esdo
->relocs
= internal_relocs
;
2807 /* Don't free alloc2, since if it was allocated we are passing it
2808 back (under the name of internal_relocs). */
2810 return internal_relocs
;
2817 bfd_release (abfd
, alloc2
);
2824 /* This is similar to _bfd_elf_link_info_read_relocs, except for that
2825 NULL is passed to _bfd_elf_link_info_read_relocs for pointer to
2826 struct bfd_link_info. */
2829 _bfd_elf_link_read_relocs (bfd
*abfd
,
2831 void *external_relocs
,
2832 Elf_Internal_Rela
*internal_relocs
,
2835 return _bfd_elf_link_info_read_relocs (abfd
, NULL
, o
, external_relocs
,
2836 internal_relocs
, keep_memory
);
2840 /* Compute the size of, and allocate space for, REL_HDR which is the
2841 section header for a section containing relocations for O. */
2844 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2845 struct bfd_elf_section_reloc_data
*reldata
)
2847 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2849 /* That allows us to calculate the size of the section. */
2850 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2852 /* The contents field must last into write_object_contents, so we
2853 allocate it with bfd_alloc rather than malloc. Also since we
2854 cannot be sure that the contents will actually be filled in,
2855 we zero the allocated space. */
2856 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2857 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2860 if (reldata
->hashes
== NULL
&& reldata
->count
)
2862 struct elf_link_hash_entry
**p
;
2864 p
= ((struct elf_link_hash_entry
**)
2865 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2869 reldata
->hashes
= p
;
2875 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2876 originated from the section given by INPUT_REL_HDR) to the
2880 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2881 asection
*input_section
,
2882 Elf_Internal_Shdr
*input_rel_hdr
,
2883 Elf_Internal_Rela
*internal_relocs
,
2884 struct elf_link_hash_entry
**rel_hash
2887 Elf_Internal_Rela
*irela
;
2888 Elf_Internal_Rela
*irelaend
;
2890 struct bfd_elf_section_reloc_data
*output_reldata
;
2891 asection
*output_section
;
2892 const struct elf_backend_data
*bed
;
2893 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2894 struct bfd_elf_section_data
*esdo
;
2896 output_section
= input_section
->output_section
;
2898 bed
= get_elf_backend_data (output_bfd
);
2899 esdo
= elf_section_data (output_section
);
2900 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2902 output_reldata
= &esdo
->rel
;
2903 swap_out
= bed
->s
->swap_reloc_out
;
2905 else if (esdo
->rela
.hdr
2906 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2908 output_reldata
= &esdo
->rela
;
2909 swap_out
= bed
->s
->swap_reloca_out
;
2914 /* xgettext:c-format */
2915 (_("%pB: relocation size mismatch in %pB section %pA"),
2916 output_bfd
, input_section
->owner
, input_section
);
2917 bfd_set_error (bfd_error_wrong_format
);
2921 erel
= output_reldata
->hdr
->contents
;
2922 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2923 irela
= internal_relocs
;
2924 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2925 * bed
->s
->int_rels_per_ext_rel
);
2926 while (irela
< irelaend
)
2928 (*swap_out
) (output_bfd
, irela
, erel
);
2929 irela
+= bed
->s
->int_rels_per_ext_rel
;
2930 erel
+= input_rel_hdr
->sh_entsize
;
2933 /* Bump the counter, so that we know where to add the next set of
2935 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2940 /* Make weak undefined symbols in PIE dynamic. */
2943 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2944 struct elf_link_hash_entry
*h
)
2946 if (bfd_link_pie (info
)
2948 && h
->root
.type
== bfd_link_hash_undefweak
)
2949 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2954 /* Fix up the flags for a symbol. This handles various cases which
2955 can only be fixed after all the input files are seen. This is
2956 currently called by both adjust_dynamic_symbol and
2957 assign_sym_version, which is unnecessary but perhaps more robust in
2958 the face of future changes. */
2961 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2962 struct elf_info_failed
*eif
)
2964 const struct elf_backend_data
*bed
;
2966 /* If this symbol was mentioned in a non-ELF file, try to set
2967 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2968 permit a non-ELF file to correctly refer to a symbol defined in
2969 an ELF dynamic object. */
2972 while (h
->root
.type
== bfd_link_hash_indirect
)
2973 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2975 if (h
->root
.type
!= bfd_link_hash_defined
2976 && h
->root
.type
!= bfd_link_hash_defweak
)
2979 h
->ref_regular_nonweak
= 1;
2983 if (h
->root
.u
.def
.section
->owner
!= NULL
2984 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2985 == bfd_target_elf_flavour
))
2988 h
->ref_regular_nonweak
= 1;
2994 if (h
->dynindx
== -1
2998 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3007 /* Unfortunately, NON_ELF is only correct if the symbol
3008 was first seen in a non-ELF file. Fortunately, if the symbol
3009 was first seen in an ELF file, we're probably OK unless the
3010 symbol was defined in a non-ELF file. Catch that case here.
3011 FIXME: We're still in trouble if the symbol was first seen in
3012 a dynamic object, and then later in a non-ELF regular object. */
3013 if ((h
->root
.type
== bfd_link_hash_defined
3014 || h
->root
.type
== bfd_link_hash_defweak
)
3016 && (h
->root
.u
.def
.section
->owner
!= NULL
3017 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3018 != bfd_target_elf_flavour
)
3019 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3020 && !h
->def_dynamic
)))
3024 /* Backend specific symbol fixup. */
3025 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3026 if (bed
->elf_backend_fixup_symbol
3027 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
3030 /* If this is a final link, and the symbol was defined as a common
3031 symbol in a regular object file, and there was no definition in
3032 any dynamic object, then the linker will have allocated space for
3033 the symbol in a common section but the DEF_REGULAR
3034 flag will not have been set. */
3035 if (h
->root
.type
== bfd_link_hash_defined
3039 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
3042 /* Symbols defined in discarded sections shouldn't be dynamic. */
3043 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
3044 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3046 /* If a weak undefined symbol has non-default visibility, we also
3047 hide it from the dynamic linker. */
3048 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3049 && h
->root
.type
== bfd_link_hash_undefweak
)
3050 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3052 /* A hidden versioned symbol in executable should be forced local if
3053 it is is locally defined, not referenced by shared library and not
3055 else if (bfd_link_executable (eif
->info
)
3056 && h
->versioned
== versioned_hidden
3057 && !eif
->info
->export_dynamic
3061 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3063 /* If -Bsymbolic was used (which means to bind references to global
3064 symbols to the definition within the shared object), and this
3065 symbol was defined in a regular object, then it actually doesn't
3066 need a PLT entry. Likewise, if the symbol has non-default
3067 visibility. If the symbol has hidden or internal visibility, we
3068 will force it local. */
3069 else if (h
->needs_plt
3070 && bfd_link_pic (eif
->info
)
3071 && is_elf_hash_table (eif
->info
->hash
)
3072 && (SYMBOLIC_BIND (eif
->info
, h
)
3073 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
3078 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3079 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
3080 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
3083 /* If this is a weak defined symbol in a dynamic object, and we know
3084 the real definition in the dynamic object, copy interesting flags
3085 over to the real definition. */
3086 if (h
->is_weakalias
)
3088 struct elf_link_hash_entry
*def
= weakdef (h
);
3090 /* If the real definition is defined by a regular object file,
3091 don't do anything special. See the longer description in
3092 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
3093 bfd_link_hash_defined as it was when put on the alias list
3094 then it must have originally been a versioned symbol (for
3095 which a non-versioned indirect symbol is created) and later
3096 a definition for the non-versioned symbol is found. In that
3097 case the indirection is flipped with the versioned symbol
3098 becoming an indirect pointing at the non-versioned symbol.
3099 Thus, not an alias any more. */
3100 if (def
->def_regular
3101 || def
->root
.type
!= bfd_link_hash_defined
)
3104 while ((h
= h
->u
.alias
) != def
)
3105 h
->is_weakalias
= 0;
3109 while (h
->root
.type
== bfd_link_hash_indirect
)
3110 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3111 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3112 || h
->root
.type
== bfd_link_hash_defweak
);
3113 BFD_ASSERT (def
->def_dynamic
);
3114 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
3121 /* Make the backend pick a good value for a dynamic symbol. This is
3122 called via elf_link_hash_traverse, and also calls itself
3126 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
3128 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3129 struct elf_link_hash_table
*htab
;
3130 const struct elf_backend_data
*bed
;
3132 if (! is_elf_hash_table (eif
->info
->hash
))
3135 /* Ignore indirect symbols. These are added by the versioning code. */
3136 if (h
->root
.type
== bfd_link_hash_indirect
)
3139 /* Fix the symbol flags. */
3140 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
3143 htab
= elf_hash_table (eif
->info
);
3144 bed
= get_elf_backend_data (htab
->dynobj
);
3146 if (h
->root
.type
== bfd_link_hash_undefweak
)
3148 if (eif
->info
->dynamic_undefined_weak
== 0)
3149 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3150 else if (eif
->info
->dynamic_undefined_weak
> 0
3152 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3153 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
3154 h
->root
.root
.string
))
3156 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3164 /* If this symbol does not require a PLT entry, and it is not
3165 defined by a dynamic object, or is not referenced by a regular
3166 object, ignore it. We do have to handle a weak defined symbol,
3167 even if no regular object refers to it, if we decided to add it
3168 to the dynamic symbol table. FIXME: Do we normally need to worry
3169 about symbols which are defined by one dynamic object and
3170 referenced by another one? */
3172 && h
->type
!= STT_GNU_IFUNC
3176 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3178 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3182 /* If we've already adjusted this symbol, don't do it again. This
3183 can happen via a recursive call. */
3184 if (h
->dynamic_adjusted
)
3187 /* Don't look at this symbol again. Note that we must set this
3188 after checking the above conditions, because we may look at a
3189 symbol once, decide not to do anything, and then get called
3190 recursively later after REF_REGULAR is set below. */
3191 h
->dynamic_adjusted
= 1;
3193 /* If this is a weak definition, and we know a real definition, and
3194 the real symbol is not itself defined by a regular object file,
3195 then get a good value for the real definition. We handle the
3196 real symbol first, for the convenience of the backend routine.
3198 Note that there is a confusing case here. If the real definition
3199 is defined by a regular object file, we don't get the real symbol
3200 from the dynamic object, but we do get the weak symbol. If the
3201 processor backend uses a COPY reloc, then if some routine in the
3202 dynamic object changes the real symbol, we will not see that
3203 change in the corresponding weak symbol. This is the way other
3204 ELF linkers work as well, and seems to be a result of the shared
3207 I will clarify this issue. Most SVR4 shared libraries define the
3208 variable _timezone and define timezone as a weak synonym. The
3209 tzset call changes _timezone. If you write
3210 extern int timezone;
3212 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3213 you might expect that, since timezone is a synonym for _timezone,
3214 the same number will print both times. However, if the processor
3215 backend uses a COPY reloc, then actually timezone will be copied
3216 into your process image, and, since you define _timezone
3217 yourself, _timezone will not. Thus timezone and _timezone will
3218 wind up at different memory locations. The tzset call will set
3219 _timezone, leaving timezone unchanged. */
3221 if (h
->is_weakalias
)
3223 struct elf_link_hash_entry
*def
= weakdef (h
);
3225 /* If we get to this point, there is an implicit reference to
3226 the alias by a regular object file via the weak symbol H. */
3227 def
->ref_regular
= 1;
3229 /* Ensure that the backend adjust_dynamic_symbol function sees
3230 the strong alias before H by recursively calling ourselves. */
3231 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3235 /* If a symbol has no type and no size and does not require a PLT
3236 entry, then we are probably about to do the wrong thing here: we
3237 are probably going to create a COPY reloc for an empty object.
3238 This case can arise when a shared object is built with assembly
3239 code, and the assembly code fails to set the symbol type. */
3241 && h
->type
== STT_NOTYPE
3244 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3245 h
->root
.root
.string
);
3247 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3256 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3260 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3261 struct elf_link_hash_entry
*h
,
3264 unsigned int power_of_two
;
3266 asection
*sec
= h
->root
.u
.def
.section
;
3268 /* The section alignment of the definition is the maximum alignment
3269 requirement of symbols defined in the section. Since we don't
3270 know the symbol alignment requirement, we start with the
3271 maximum alignment and check low bits of the symbol address
3272 for the minimum alignment. */
3273 power_of_two
= bfd_section_alignment (sec
);
3274 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3275 while ((h
->root
.u
.def
.value
& mask
) != 0)
3281 if (power_of_two
> bfd_section_alignment (dynbss
))
3283 /* Adjust the section alignment if needed. */
3284 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3288 /* We make sure that the symbol will be aligned properly. */
3289 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3291 /* Define the symbol as being at this point in DYNBSS. */
3292 h
->root
.u
.def
.section
= dynbss
;
3293 h
->root
.u
.def
.value
= dynbss
->size
;
3295 /* Increment the size of DYNBSS to make room for the symbol. */
3296 dynbss
->size
+= h
->size
;
3298 /* No error if extern_protected_data is true. */
3299 if (h
->protected_def
3300 && (!info
->extern_protected_data
3301 || (info
->extern_protected_data
< 0
3302 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3303 info
->callbacks
->einfo
3304 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3305 h
->root
.root
.string
);
3310 /* Adjust all external symbols pointing into SEC_MERGE sections
3311 to reflect the object merging within the sections. */
3314 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3318 if ((h
->root
.type
== bfd_link_hash_defined
3319 || h
->root
.type
== bfd_link_hash_defweak
)
3320 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3321 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3323 bfd
*output_bfd
= (bfd
*) data
;
3325 h
->root
.u
.def
.value
=
3326 _bfd_merged_section_offset (output_bfd
,
3327 &h
->root
.u
.def
.section
,
3328 elf_section_data (sec
)->sec_info
,
3329 h
->root
.u
.def
.value
);
3335 /* Returns false if the symbol referred to by H should be considered
3336 to resolve local to the current module, and true if it should be
3337 considered to bind dynamically. */
3340 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3341 struct bfd_link_info
*info
,
3342 bool not_local_protected
)
3344 bool binding_stays_local_p
;
3345 const struct elf_backend_data
*bed
;
3346 struct elf_link_hash_table
*hash_table
;
3351 while (h
->root
.type
== bfd_link_hash_indirect
3352 || h
->root
.type
== bfd_link_hash_warning
)
3353 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3355 /* If it was forced local, then clearly it's not dynamic. */
3356 if (h
->dynindx
== -1)
3358 if (h
->forced_local
)
3361 /* Identify the cases where name binding rules say that a
3362 visible symbol resolves locally. */
3363 binding_stays_local_p
= (bfd_link_executable (info
)
3364 || SYMBOLIC_BIND (info
, h
));
3366 switch (ELF_ST_VISIBILITY (h
->other
))
3373 hash_table
= elf_hash_table (info
);
3374 if (!is_elf_hash_table (&hash_table
->root
))
3377 bed
= get_elf_backend_data (hash_table
->dynobj
);
3379 /* Proper resolution for function pointer equality may require
3380 that these symbols perhaps be resolved dynamically, even though
3381 we should be resolving them to the current module. */
3382 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3383 binding_stays_local_p
= true;
3390 /* If it isn't defined locally, then clearly it's dynamic. */
3391 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3394 /* Otherwise, the symbol is dynamic if binding rules don't tell
3395 us that it remains local. */
3396 return !binding_stays_local_p
;
3399 /* Return true if the symbol referred to by H should be considered
3400 to resolve local to the current module, and false otherwise. Differs
3401 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3402 undefined symbols. The two functions are virtually identical except
3403 for the place where dynindx == -1 is tested. If that test is true,
3404 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3405 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3407 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3408 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3409 treatment of undefined weak symbols. For those that do not make
3410 undefined weak symbols dynamic, both functions may return false. */
3413 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3414 struct bfd_link_info
*info
,
3415 bool local_protected
)
3417 const struct elf_backend_data
*bed
;
3418 struct elf_link_hash_table
*hash_table
;
3420 /* If it's a local sym, of course we resolve locally. */
3424 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3425 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3426 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3429 /* Forced local symbols resolve locally. */
3430 if (h
->forced_local
)
3433 /* Common symbols that become definitions don't get the DEF_REGULAR
3434 flag set, so test it first, and don't bail out. */
3435 if (ELF_COMMON_DEF_P (h
))
3437 /* If we don't have a definition in a regular file, then we can't
3438 resolve locally. The sym is either undefined or dynamic. */
3439 else if (!h
->def_regular
)
3442 /* Non-dynamic symbols resolve locally. */
3443 if (h
->dynindx
== -1)
3446 /* At this point, we know the symbol is defined and dynamic. In an
3447 executable it must resolve locally, likewise when building symbolic
3448 shared libraries. */
3449 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3452 /* Now deal with defined dynamic symbols in shared libraries. Ones
3453 with default visibility might not resolve locally. */
3454 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3457 hash_table
= elf_hash_table (info
);
3458 if (!is_elf_hash_table (&hash_table
->root
))
3461 /* STV_PROTECTED symbols with indirect external access are local. */
3462 if (info
->indirect_extern_access
> 0)
3465 bed
= get_elf_backend_data (hash_table
->dynobj
);
3467 /* If extern_protected_data is false, STV_PROTECTED non-function
3468 symbols are local. */
3469 if ((!info
->extern_protected_data
3470 || (info
->extern_protected_data
< 0
3471 && !bed
->extern_protected_data
))
3472 && !bed
->is_function_type (h
->type
))
3475 /* Function pointer equality tests may require that STV_PROTECTED
3476 symbols be treated as dynamic symbols. If the address of a
3477 function not defined in an executable is set to that function's
3478 plt entry in the executable, then the address of the function in
3479 a shared library must also be the plt entry in the executable. */
3480 return local_protected
;
3483 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3484 aligned. Returns the first TLS output section. */
3486 struct bfd_section
*
3487 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3489 struct bfd_section
*sec
, *tls
;
3490 unsigned int align
= 0;
3492 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3493 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3497 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3498 if (sec
->alignment_power
> align
)
3499 align
= sec
->alignment_power
;
3501 elf_hash_table (info
)->tls_sec
= tls
;
3503 /* Ensure the alignment of the first section (usually .tdata) is the largest
3504 alignment, so that the tls segment starts aligned. */
3506 tls
->alignment_power
= align
;
3511 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3513 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3514 Elf_Internal_Sym
*sym
)
3516 const struct elf_backend_data
*bed
;
3518 /* Local symbols do not count, but target specific ones might. */
3519 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3520 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3523 bed
= get_elf_backend_data (abfd
);
3524 /* Function symbols do not count. */
3525 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3528 /* If the section is undefined, then so is the symbol. */
3529 if (sym
->st_shndx
== SHN_UNDEF
)
3532 /* If the symbol is defined in the common section, then
3533 it is a common definition and so does not count. */
3534 if (bed
->common_definition (sym
))
3537 /* If the symbol is in a target specific section then we
3538 must rely upon the backend to tell us what it is. */
3539 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3540 /* FIXME - this function is not coded yet:
3542 return _bfd_is_global_symbol_definition (abfd, sym);
3544 Instead for now assume that the definition is not global,
3545 Even if this is wrong, at least the linker will behave
3546 in the same way that it used to do. */
3552 /* Search the symbol table of the archive element of the archive ABFD
3553 whose archive map contains a mention of SYMDEF, and determine if
3554 the symbol is defined in this element. */
3556 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3558 Elf_Internal_Shdr
* hdr
;
3562 Elf_Internal_Sym
*isymbuf
;
3563 Elf_Internal_Sym
*isym
;
3564 Elf_Internal_Sym
*isymend
;
3567 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
, NULL
);
3571 if (! bfd_check_format (abfd
, bfd_object
))
3574 /* Select the appropriate symbol table. If we don't know if the
3575 object file is an IR object, give linker LTO plugin a chance to
3576 get the correct symbol table. */
3577 if (abfd
->plugin_format
== bfd_plugin_yes
3578 #if BFD_SUPPORTS_PLUGINS
3579 || (abfd
->plugin_format
== bfd_plugin_unknown
3580 && bfd_link_plugin_object_p (abfd
))
3584 /* Use the IR symbol table if the object has been claimed by
3586 abfd
= abfd
->plugin_dummy_bfd
;
3587 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3589 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3590 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3592 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3594 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3596 /* The sh_info field of the symtab header tells us where the
3597 external symbols start. We don't care about the local symbols. */
3598 if (elf_bad_symtab (abfd
))
3600 extsymcount
= symcount
;
3605 extsymcount
= symcount
- hdr
->sh_info
;
3606 extsymoff
= hdr
->sh_info
;
3609 if (extsymcount
== 0)
3612 /* Read in the symbol table. */
3613 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3615 if (isymbuf
== NULL
)
3618 /* Scan the symbol table looking for SYMDEF. */
3620 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3624 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3629 if (strcmp (name
, symdef
->name
) == 0)
3631 result
= is_global_data_symbol_definition (abfd
, isym
);
3641 /* Add an entry to the .dynamic table. */
3644 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3648 struct elf_link_hash_table
*hash_table
;
3649 const struct elf_backend_data
*bed
;
3651 bfd_size_type newsize
;
3652 bfd_byte
*newcontents
;
3653 Elf_Internal_Dyn dyn
;
3655 hash_table
= elf_hash_table (info
);
3656 if (! is_elf_hash_table (&hash_table
->root
))
3659 if (tag
== DT_RELA
|| tag
== DT_REL
)
3660 hash_table
->dynamic_relocs
= true;
3662 bed
= get_elf_backend_data (hash_table
->dynobj
);
3663 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3664 BFD_ASSERT (s
!= NULL
);
3666 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3667 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3668 if (newcontents
== NULL
)
3672 dyn
.d_un
.d_val
= val
;
3673 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3676 s
->contents
= newcontents
;
3681 /* Strip zero-sized dynamic sections. */
3684 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3686 struct elf_link_hash_table
*hash_table
;
3687 const struct elf_backend_data
*bed
;
3688 asection
*s
, *sdynamic
, **pp
;
3689 asection
*rela_dyn
, *rel_dyn
;
3690 Elf_Internal_Dyn dyn
;
3691 bfd_byte
*extdyn
, *next
;
3692 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3693 bool strip_zero_sized
;
3694 bool strip_zero_sized_plt
;
3696 if (bfd_link_relocatable (info
))
3699 hash_table
= elf_hash_table (info
);
3700 if (!is_elf_hash_table (&hash_table
->root
))
3703 if (!hash_table
->dynobj
)
3706 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3710 bed
= get_elf_backend_data (hash_table
->dynobj
);
3711 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3713 strip_zero_sized
= false;
3714 strip_zero_sized_plt
= false;
3716 /* Strip zero-sized dynamic sections. */
3717 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3718 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3719 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3723 || s
== hash_table
->srelplt
->output_section
3724 || s
== hash_table
->splt
->output_section
))
3727 info
->output_bfd
->section_count
--;
3728 strip_zero_sized
= true;
3733 else if (s
== hash_table
->splt
->output_section
)
3735 s
= hash_table
->splt
;
3736 strip_zero_sized_plt
= true;
3739 s
= hash_table
->srelplt
;
3740 s
->flags
|= SEC_EXCLUDE
;
3741 s
->output_section
= bfd_abs_section_ptr
;
3746 if (strip_zero_sized_plt
&& sdynamic
->size
!= 0)
3747 for (extdyn
= sdynamic
->contents
;
3748 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3751 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3752 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3760 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3761 the procedure linkage table (the .plt section) has been
3763 memmove (extdyn
, next
,
3764 sdynamic
->size
- (next
- sdynamic
->contents
));
3769 if (strip_zero_sized
)
3771 /* Regenerate program headers. */
3772 elf_seg_map (info
->output_bfd
) = NULL
;
3773 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
,
3780 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3781 1 if a DT_NEEDED tag already exists, and 0 on success. */
3784 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3786 struct elf_link_hash_table
*hash_table
;
3790 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3793 hash_table
= elf_hash_table (info
);
3794 soname
= elf_dt_name (abfd
);
3795 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, false);
3796 if (strindex
== (size_t) -1)
3799 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3802 const struct elf_backend_data
*bed
;
3805 bed
= get_elf_backend_data (hash_table
->dynobj
);
3806 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3807 if (sdyn
!= NULL
&& sdyn
->size
!= 0)
3808 for (extdyn
= sdyn
->contents
;
3809 extdyn
< sdyn
->contents
+ sdyn
->size
;
3810 extdyn
+= bed
->s
->sizeof_dyn
)
3812 Elf_Internal_Dyn dyn
;
3814 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3815 if (dyn
.d_tag
== DT_NEEDED
3816 && dyn
.d_un
.d_val
== strindex
)
3818 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3824 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3827 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3833 /* Return true if SONAME is on the needed list between NEEDED and STOP
3834 (or the end of list if STOP is NULL), and needed by a library that
3838 on_needed_list (const char *soname
,
3839 struct bfd_link_needed_list
*needed
,
3840 struct bfd_link_needed_list
*stop
)
3842 struct bfd_link_needed_list
*look
;
3843 for (look
= needed
; look
!= stop
; look
= look
->next
)
3844 if (strcmp (soname
, look
->name
) == 0
3845 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3846 /* If needed by a library that itself is not directly
3847 needed, recursively check whether that library is
3848 indirectly needed. Since we add DT_NEEDED entries to
3849 the end of the list, library dependencies appear after
3850 the library. Therefore search prior to the current
3851 LOOK, preventing possible infinite recursion. */
3852 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3858 /* Sort symbol by value, section, size, and type. */
3860 elf_sort_symbol (const void *arg1
, const void *arg2
)
3862 const struct elf_link_hash_entry
*h1
;
3863 const struct elf_link_hash_entry
*h2
;
3864 bfd_signed_vma vdiff
;
3869 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3870 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3871 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3873 return vdiff
> 0 ? 1 : -1;
3875 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3879 /* Sort so that sized symbols are selected over zero size symbols. */
3880 vdiff
= h1
->size
- h2
->size
;
3882 return vdiff
> 0 ? 1 : -1;
3884 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3885 if (h1
->type
!= h2
->type
)
3886 return h1
->type
- h2
->type
;
3888 /* If symbols are properly sized and typed, and multiple strong
3889 aliases are not defined in a shared library by the user we
3890 shouldn't get here. Unfortunately linker script symbols like
3891 __bss_start sometimes match a user symbol defined at the start of
3892 .bss without proper size and type. We'd like to preference the
3893 user symbol over reserved system symbols. Sort on leading
3895 n1
= h1
->root
.root
.string
;
3896 n2
= h2
->root
.root
.string
;
3909 /* Final sort on name selects user symbols like '_u' over reserved
3910 system symbols like '_Z' and also will avoid qsort instability. */
3914 /* This function is used to adjust offsets into .dynstr for
3915 dynamic symbols. This is called via elf_link_hash_traverse. */
3918 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3920 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3922 if (h
->dynindx
!= -1)
3923 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3927 /* Assign string offsets in .dynstr, update all structures referencing
3931 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3933 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3934 struct elf_link_local_dynamic_entry
*entry
;
3935 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3936 bfd
*dynobj
= hash_table
->dynobj
;
3939 const struct elf_backend_data
*bed
;
3942 _bfd_elf_strtab_finalize (dynstr
);
3943 size
= _bfd_elf_strtab_size (dynstr
);
3945 /* Allow the linker to examine the dynsymtab now it's fully populated. */
3947 if (info
->callbacks
->examine_strtab
)
3948 info
->callbacks
->examine_strtab (dynstr
);
3950 bed
= get_elf_backend_data (dynobj
);
3951 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3952 BFD_ASSERT (sdyn
!= NULL
);
3954 /* Update all .dynamic entries referencing .dynstr strings. */
3955 for (extdyn
= sdyn
->contents
;
3956 extdyn
< PTR_ADD (sdyn
->contents
, sdyn
->size
);
3957 extdyn
+= bed
->s
->sizeof_dyn
)
3959 Elf_Internal_Dyn dyn
;
3961 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3965 dyn
.d_un
.d_val
= size
;
3975 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3980 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3983 /* Now update local dynamic symbols. */
3984 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3985 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3986 entry
->isym
.st_name
);
3988 /* And the rest of dynamic symbols. */
3989 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3991 /* Adjust version definitions. */
3992 if (elf_tdata (output_bfd
)->cverdefs
)
3997 Elf_Internal_Verdef def
;
3998 Elf_Internal_Verdaux defaux
;
4000 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
4004 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
4006 p
+= sizeof (Elf_External_Verdef
);
4007 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
4009 for (i
= 0; i
< def
.vd_cnt
; ++i
)
4011 _bfd_elf_swap_verdaux_in (output_bfd
,
4012 (Elf_External_Verdaux
*) p
, &defaux
);
4013 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
4015 _bfd_elf_swap_verdaux_out (output_bfd
,
4016 &defaux
, (Elf_External_Verdaux
*) p
);
4017 p
+= sizeof (Elf_External_Verdaux
);
4020 while (def
.vd_next
);
4023 /* Adjust version references. */
4024 if (elf_tdata (output_bfd
)->verref
)
4029 Elf_Internal_Verneed need
;
4030 Elf_Internal_Vernaux needaux
;
4032 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
4036 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
4038 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
4039 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
4040 (Elf_External_Verneed
*) p
);
4041 p
+= sizeof (Elf_External_Verneed
);
4042 for (i
= 0; i
< need
.vn_cnt
; ++i
)
4044 _bfd_elf_swap_vernaux_in (output_bfd
,
4045 (Elf_External_Vernaux
*) p
, &needaux
);
4046 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
4048 _bfd_elf_swap_vernaux_out (output_bfd
,
4050 (Elf_External_Vernaux
*) p
);
4051 p
+= sizeof (Elf_External_Vernaux
);
4054 while (need
.vn_next
);
4060 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
4061 The default is to only match when the INPUT and OUTPUT are exactly
4065 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
4066 const bfd_target
*output
)
4068 return input
== output
;
4071 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
4072 This version is used when different targets for the same architecture
4073 are virtually identical. */
4076 _bfd_elf_relocs_compatible (const bfd_target
*input
,
4077 const bfd_target
*output
)
4079 const struct elf_backend_data
*obed
, *ibed
;
4081 if (input
== output
)
4084 ibed
= xvec_get_elf_backend_data (input
);
4085 obed
= xvec_get_elf_backend_data (output
);
4087 if (ibed
->arch
!= obed
->arch
)
4090 /* If both backends are using this function, deem them compatible. */
4091 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
4094 /* Make a special call to the linker "notice" function to tell it that
4095 we are about to handle an as-needed lib, or have finished
4096 processing the lib. */
4099 _bfd_elf_notice_as_needed (bfd
*ibfd
,
4100 struct bfd_link_info
*info
,
4101 enum notice_asneeded_action act
)
4103 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
4106 /* Call ACTION on each relocation in an ELF object file. */
4109 _bfd_elf_link_iterate_on_relocs
4110 (bfd
*abfd
, struct bfd_link_info
*info
,
4111 bool (*action
) (bfd
*, struct bfd_link_info
*, asection
*,
4112 const Elf_Internal_Rela
*))
4114 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4115 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
4117 /* If this object is the same format as the output object, and it is
4118 not a shared library, then let the backend look through the
4121 This is required to build global offset table entries and to
4122 arrange for dynamic relocs. It is not required for the
4123 particular common case of linking non PIC code, even when linking
4124 against shared libraries, but unfortunately there is no way of
4125 knowing whether an object file has been compiled PIC or not.
4126 Looking through the relocs is not particularly time consuming.
4127 The problem is that we must either (1) keep the relocs in memory,
4128 which causes the linker to require additional runtime memory or
4129 (2) read the relocs twice from the input file, which wastes time.
4130 This would be a good case for using mmap.
4132 I have no idea how to handle linking PIC code into a file of a
4133 different format. It probably can't be done. */
4134 if ((abfd
->flags
& DYNAMIC
) == 0
4135 && is_elf_hash_table (&htab
->root
)
4136 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4137 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4141 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4143 Elf_Internal_Rela
*internal_relocs
;
4146 /* Don't check relocations in excluded sections. Don't do
4147 anything special with non-loaded, non-alloced sections.
4148 In particular, any relocs in such sections should not
4149 affect GOT and PLT reference counting (ie. we don't
4150 allow them to create GOT or PLT entries), there's no
4151 possibility or desire to optimize TLS relocs, and
4152 there's not much point in propagating relocs to shared
4153 libs that the dynamic linker won't relocate. */
4154 if ((o
->flags
& SEC_ALLOC
) == 0
4155 || (o
->flags
& SEC_RELOC
) == 0
4156 || (o
->flags
& SEC_EXCLUDE
) != 0
4157 || o
->reloc_count
== 0
4158 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4159 && (o
->flags
& SEC_DEBUGGING
) != 0)
4160 || bfd_is_abs_section (o
->output_section
))
4163 internal_relocs
= _bfd_elf_link_info_read_relocs (abfd
, info
,
4166 _bfd_link_keep_memory (info
));
4167 if (internal_relocs
== NULL
)
4170 ok
= action (abfd
, info
, o
, internal_relocs
);
4172 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4173 free (internal_relocs
);
4183 /* Check relocations in an ELF object file. This is called after
4184 all input files have been opened. */
4187 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
4189 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4190 if (bed
->check_relocs
!= NULL
)
4191 return _bfd_elf_link_iterate_on_relocs (abfd
, info
,
4196 /* Add symbols from an ELF object file to the linker hash table. */
4199 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4201 Elf_Internal_Ehdr
*ehdr
;
4202 Elf_Internal_Shdr
*hdr
;
4206 struct elf_link_hash_entry
**sym_hash
;
4208 Elf_External_Versym
*extversym
= NULL
;
4209 Elf_External_Versym
*extversym_end
= NULL
;
4210 Elf_External_Versym
*ever
;
4211 struct elf_link_hash_entry
*weaks
;
4212 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4213 size_t nondeflt_vers_cnt
= 0;
4214 Elf_Internal_Sym
*isymbuf
= NULL
;
4215 Elf_Internal_Sym
*isym
;
4216 Elf_Internal_Sym
*isymend
;
4217 const struct elf_backend_data
*bed
;
4219 struct elf_link_hash_table
*htab
;
4220 void *alloc_mark
= NULL
;
4221 struct bfd_hash_entry
**old_table
= NULL
;
4222 unsigned int old_size
= 0;
4223 unsigned int old_count
= 0;
4224 void *old_tab
= NULL
;
4226 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4227 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4228 void *old_strtab
= NULL
;
4233 htab
= elf_hash_table (info
);
4234 bed
= get_elf_backend_data (abfd
);
4236 if ((abfd
->flags
& DYNAMIC
) == 0)
4242 /* You can't use -r against a dynamic object. Also, there's no
4243 hope of using a dynamic object which does not exactly match
4244 the format of the output file. */
4245 if (bfd_link_relocatable (info
)
4246 || !is_elf_hash_table (&htab
->root
)
4247 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4249 if (bfd_link_relocatable (info
))
4250 bfd_set_error (bfd_error_invalid_operation
);
4252 bfd_set_error (bfd_error_wrong_format
);
4257 ehdr
= elf_elfheader (abfd
);
4258 if (info
->warn_alternate_em
4259 && bed
->elf_machine_code
!= ehdr
->e_machine
4260 && ((bed
->elf_machine_alt1
!= 0
4261 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4262 || (bed
->elf_machine_alt2
!= 0
4263 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4265 /* xgettext:c-format */
4266 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4267 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4269 /* As a GNU extension, any input sections which are named
4270 .gnu.warning.SYMBOL are treated as warning symbols for the given
4271 symbol. This differs from .gnu.warning sections, which generate
4272 warnings when they are included in an output file. */
4273 /* PR 12761: Also generate this warning when building shared libraries. */
4274 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4278 name
= bfd_section_name (s
);
4279 if (startswith (name
, ".gnu.warning."))
4284 name
+= sizeof ".gnu.warning." - 1;
4286 /* If this is a shared object, then look up the symbol
4287 in the hash table. If it is there, and it is already
4288 been defined, then we will not be using the entry
4289 from this shared object, so we don't need to warn.
4290 FIXME: If we see the definition in a regular object
4291 later on, we will warn, but we shouldn't. The only
4292 fix is to keep track of what warnings we are supposed
4293 to emit, and then handle them all at the end of the
4297 struct elf_link_hash_entry
*h
;
4299 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
4301 /* FIXME: What about bfd_link_hash_common? */
4303 && (h
->root
.type
== bfd_link_hash_defined
4304 || h
->root
.type
== bfd_link_hash_defweak
))
4309 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4313 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4318 if (! (_bfd_generic_link_add_one_symbol
4319 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4320 false, bed
->collect
, NULL
)))
4323 if (bfd_link_executable (info
))
4325 /* Clobber the section size so that the warning does
4326 not get copied into the output file. */
4329 /* Also set SEC_EXCLUDE, so that symbols defined in
4330 the warning section don't get copied to the output. */
4331 s
->flags
|= SEC_EXCLUDE
;
4336 just_syms
= ((s
= abfd
->sections
) != NULL
4337 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4342 /* If we are creating a shared library, create all the dynamic
4343 sections immediately. We need to attach them to something,
4344 so we attach them to this BFD, provided it is the right
4345 format and is not from ld --just-symbols. Always create the
4346 dynamic sections for -E/--dynamic-list. FIXME: If there
4347 are no input BFD's of the same format as the output, we can't
4348 make a shared library. */
4350 && (bfd_link_pic (info
)
4351 || (!bfd_link_relocatable (info
)
4353 && (info
->export_dynamic
|| info
->dynamic
)))
4354 && is_elf_hash_table (&htab
->root
)
4355 && info
->output_bfd
->xvec
== abfd
->xvec
4356 && !htab
->dynamic_sections_created
)
4358 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4362 else if (!is_elf_hash_table (&htab
->root
))
4366 const char *soname
= NULL
;
4368 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4369 const Elf_Internal_Phdr
*phdr
;
4370 struct elf_link_loaded_list
*loaded_lib
;
4372 /* ld --just-symbols and dynamic objects don't mix very well.
4373 ld shouldn't allow it. */
4377 /* If this dynamic lib was specified on the command line with
4378 --as-needed in effect, then we don't want to add a DT_NEEDED
4379 tag unless the lib is actually used. Similary for libs brought
4380 in by another lib's DT_NEEDED. When --no-add-needed is used
4381 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4382 any dynamic library in DT_NEEDED tags in the dynamic lib at
4384 add_needed
= (elf_dyn_lib_class (abfd
)
4385 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4386 | DYN_NO_NEEDED
)) == 0;
4388 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4389 if (s
!= NULL
&& s
->size
!= 0 && (s
->flags
& SEC_HAS_CONTENTS
) != 0)
4393 unsigned int elfsec
;
4394 unsigned long shlink
;
4396 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4403 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4404 if (elfsec
== SHN_BAD
)
4405 goto error_free_dyn
;
4406 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4408 for (extdyn
= dynbuf
;
4409 (size_t) (dynbuf
+ s
->size
- extdyn
) >= bed
->s
->sizeof_dyn
;
4410 extdyn
+= bed
->s
->sizeof_dyn
)
4412 Elf_Internal_Dyn dyn
;
4414 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4415 if (dyn
.d_tag
== DT_SONAME
)
4417 unsigned int tagv
= dyn
.d_un
.d_val
;
4418 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4420 goto error_free_dyn
;
4422 if (dyn
.d_tag
== DT_NEEDED
)
4424 struct bfd_link_needed_list
*n
, **pn
;
4426 unsigned int tagv
= dyn
.d_un
.d_val
;
4427 size_t amt
= sizeof (struct bfd_link_needed_list
);
4429 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4430 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4431 if (n
== NULL
|| fnm
== NULL
)
4432 goto error_free_dyn
;
4433 amt
= strlen (fnm
) + 1;
4434 anm
= (char *) bfd_alloc (abfd
, amt
);
4436 goto error_free_dyn
;
4437 memcpy (anm
, fnm
, amt
);
4441 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4445 if (dyn
.d_tag
== DT_RUNPATH
)
4447 struct bfd_link_needed_list
*n
, **pn
;
4449 unsigned int tagv
= dyn
.d_un
.d_val
;
4450 size_t amt
= sizeof (struct bfd_link_needed_list
);
4452 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4453 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4454 if (n
== NULL
|| fnm
== NULL
)
4455 goto error_free_dyn
;
4456 amt
= strlen (fnm
) + 1;
4457 anm
= (char *) bfd_alloc (abfd
, amt
);
4459 goto error_free_dyn
;
4460 memcpy (anm
, fnm
, amt
);
4464 for (pn
= & runpath
;
4470 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4471 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4473 struct bfd_link_needed_list
*n
, **pn
;
4475 unsigned int tagv
= dyn
.d_un
.d_val
;
4476 size_t amt
= sizeof (struct bfd_link_needed_list
);
4478 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4479 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4480 if (n
== NULL
|| fnm
== NULL
)
4481 goto error_free_dyn
;
4482 amt
= strlen (fnm
) + 1;
4483 anm
= (char *) bfd_alloc (abfd
, amt
);
4485 goto error_free_dyn
;
4486 memcpy (anm
, fnm
, amt
);
4496 if (dyn
.d_tag
== DT_AUDIT
)
4498 unsigned int tagv
= dyn
.d_un
.d_val
;
4499 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4501 if (dyn
.d_tag
== DT_FLAGS_1
)
4502 elf_tdata (abfd
)->is_pie
= (dyn
.d_un
.d_val
& DF_1_PIE
) != 0;
4508 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4509 frees all more recently bfd_alloc'd blocks as well. */
4515 struct bfd_link_needed_list
**pn
;
4516 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4521 /* If we have a PT_GNU_RELRO program header, mark as read-only
4522 all sections contained fully therein. This makes relro
4523 shared library sections appear as they will at run-time. */
4524 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4525 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4526 if (phdr
->p_type
== PT_GNU_RELRO
)
4528 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4530 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4532 if ((s
->flags
& SEC_ALLOC
) != 0
4533 && s
->vma
* opb
>= phdr
->p_vaddr
4534 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4535 s
->flags
|= SEC_READONLY
;
4540 /* We do not want to include any of the sections in a dynamic
4541 object in the output file. We hack by simply clobbering the
4542 list of sections in the BFD. This could be handled more
4543 cleanly by, say, a new section flag; the existing
4544 SEC_NEVER_LOAD flag is not the one we want, because that one
4545 still implies that the section takes up space in the output
4547 bfd_section_list_clear (abfd
);
4549 /* Find the name to use in a DT_NEEDED entry that refers to this
4550 object. If the object has a DT_SONAME entry, we use it.
4551 Otherwise, if the generic linker stuck something in
4552 elf_dt_name, we use that. Otherwise, we just use the file
4554 if (soname
== NULL
|| *soname
== '\0')
4556 soname
= elf_dt_name (abfd
);
4557 if (soname
== NULL
|| *soname
== '\0')
4558 soname
= bfd_get_filename (abfd
);
4561 /* Save the SONAME because sometimes the linker emulation code
4562 will need to know it. */
4563 elf_dt_name (abfd
) = soname
;
4565 /* If we have already included this dynamic object in the
4566 link, just ignore it. There is no reason to include a
4567 particular dynamic object more than once. */
4568 for (loaded_lib
= htab
->dyn_loaded
;
4570 loaded_lib
= loaded_lib
->next
)
4572 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4576 /* Create dynamic sections for backends that require that be done
4577 before setup_gnu_properties. */
4579 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4582 /* Save the DT_AUDIT entry for the linker emulation code. */
4583 elf_dt_audit (abfd
) = audit
;
4586 /* If this is a dynamic object, we always link against the .dynsym
4587 symbol table, not the .symtab symbol table. The dynamic linker
4588 will only see the .dynsym symbol table, so there is no reason to
4589 look at .symtab for a dynamic object. */
4591 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4592 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4594 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4596 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4598 /* The sh_info field of the symtab header tells us where the
4599 external symbols start. We don't care about the local symbols at
4601 if (elf_bad_symtab (abfd
))
4603 extsymcount
= symcount
;
4608 extsymcount
= symcount
- hdr
->sh_info
;
4609 extsymoff
= hdr
->sh_info
;
4612 sym_hash
= elf_sym_hashes (abfd
);
4613 if (extsymcount
!= 0)
4615 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4617 if (isymbuf
== NULL
)
4620 if (sym_hash
== NULL
)
4622 /* We store a pointer to the hash table entry for each
4624 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4625 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4626 if (sym_hash
== NULL
)
4627 goto error_free_sym
;
4628 elf_sym_hashes (abfd
) = sym_hash
;
4634 /* Read in any version definitions. */
4635 if (!_bfd_elf_slurp_version_tables (abfd
,
4636 info
->default_imported_symver
))
4637 goto error_free_sym
;
4639 /* Read in the symbol versions, but don't bother to convert them
4640 to internal format. */
4641 if (elf_dynversym (abfd
) != 0)
4643 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4644 bfd_size_type amt
= versymhdr
->sh_size
;
4646 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4647 goto error_free_sym
;
4648 extversym
= (Elf_External_Versym
*)
4649 _bfd_malloc_and_read (abfd
, amt
, amt
);
4650 if (extversym
== NULL
)
4651 goto error_free_sym
;
4652 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4656 /* If we are loading an as-needed shared lib, save the symbol table
4657 state before we start adding symbols. If the lib turns out
4658 to be unneeded, restore the state. */
4659 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4664 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4666 struct bfd_hash_entry
*p
;
4667 struct elf_link_hash_entry
*h
;
4669 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4671 h
= (struct elf_link_hash_entry
*) p
;
4672 entsize
+= htab
->root
.table
.entsize
;
4673 if (h
->root
.type
== bfd_link_hash_warning
)
4675 entsize
+= htab
->root
.table
.entsize
;
4676 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4678 if (h
->root
.type
== bfd_link_hash_common
)
4679 entsize
+= sizeof (*h
->root
.u
.c
.p
);
4683 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4684 old_tab
= bfd_malloc (tabsize
+ entsize
);
4685 if (old_tab
== NULL
)
4686 goto error_free_vers
;
4688 /* Remember the current objalloc pointer, so that all mem for
4689 symbols added can later be reclaimed. */
4690 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4691 if (alloc_mark
== NULL
)
4692 goto error_free_vers
;
4694 /* Make a special call to the linker "notice" function to
4695 tell it that we are about to handle an as-needed lib. */
4696 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4697 goto error_free_vers
;
4699 /* Clone the symbol table. Remember some pointers into the
4700 symbol table, and dynamic symbol count. */
4701 old_ent
= (char *) old_tab
+ tabsize
;
4702 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4703 old_undefs
= htab
->root
.undefs
;
4704 old_undefs_tail
= htab
->root
.undefs_tail
;
4705 old_table
= htab
->root
.table
.table
;
4706 old_size
= htab
->root
.table
.size
;
4707 old_count
= htab
->root
.table
.count
;
4709 if (htab
->dynstr
!= NULL
)
4711 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4712 if (old_strtab
== NULL
)
4713 goto error_free_vers
;
4716 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4718 struct bfd_hash_entry
*p
;
4719 struct elf_link_hash_entry
*h
;
4721 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4723 h
= (struct elf_link_hash_entry
*) p
;
4724 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4725 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4726 if (h
->root
.type
== bfd_link_hash_warning
)
4728 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4729 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4730 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4732 if (h
->root
.type
== bfd_link_hash_common
)
4734 memcpy (old_ent
, h
->root
.u
.c
.p
, sizeof (*h
->root
.u
.c
.p
));
4735 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
4742 if (extversym
== NULL
)
4744 else if (extversym
+ extsymoff
< extversym_end
)
4745 ever
= extversym
+ extsymoff
;
4748 /* xgettext:c-format */
4749 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4750 abfd
, (long) extsymoff
,
4751 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4752 bfd_set_error (bfd_error_bad_value
);
4753 goto error_free_vers
;
4756 if (!bfd_link_relocatable (info
)
4757 && abfd
->lto_slim_object
)
4760 (_("%pB: plugin needed to handle lto object"), abfd
);
4763 for (isym
= isymbuf
, isymend
= PTR_ADD (isymbuf
, extsymcount
);
4765 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4769 asection
*sec
, *new_sec
;
4772 struct elf_link_hash_entry
*h
;
4773 struct elf_link_hash_entry
*hi
;
4775 bool size_change_ok
;
4776 bool type_change_ok
;
4782 unsigned int old_alignment
;
4783 unsigned int shindex
;
4789 flags
= BSF_NO_FLAGS
;
4791 value
= isym
->st_value
;
4792 common
= bed
->common_definition (isym
);
4793 if (common
&& info
->inhibit_common_definition
)
4795 /* Treat common symbol as undefined for --no-define-common. */
4796 isym
->st_shndx
= SHN_UNDEF
;
4801 bind
= ELF_ST_BIND (isym
->st_info
);
4805 /* This should be impossible, since ELF requires that all
4806 global symbols follow all local symbols, and that sh_info
4807 point to the first global symbol. Unfortunately, Irix 5
4809 if (elf_bad_symtab (abfd
))
4812 /* If we aren't prepared to handle locals within the globals
4813 then we'll likely segfault on a NULL symbol hash if the
4814 symbol is ever referenced in relocations. */
4815 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4816 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4817 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4818 " (>= sh_info of %lu)"),
4819 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4822 /* Dynamic object relocations are not processed by ld, so
4823 ld won't run into the problem mentioned above. */
4826 bfd_set_error (bfd_error_bad_value
);
4827 goto error_free_vers
;
4830 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4838 case STB_GNU_UNIQUE
:
4839 flags
= BSF_GNU_UNIQUE
;
4843 /* Leave it up to the processor backend. */
4847 if (isym
->st_shndx
== SHN_UNDEF
)
4848 sec
= bfd_und_section_ptr
;
4849 else if (isym
->st_shndx
== SHN_ABS
)
4850 sec
= bfd_abs_section_ptr
;
4851 else if (isym
->st_shndx
== SHN_COMMON
)
4853 sec
= bfd_com_section_ptr
;
4854 /* What ELF calls the size we call the value. What ELF
4855 calls the value we call the alignment. */
4856 value
= isym
->st_size
;
4860 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4862 sec
= bfd_abs_section_ptr
;
4863 else if (discarded_section (sec
))
4865 /* Symbols from discarded section are undefined. We keep
4867 sec
= bfd_und_section_ptr
;
4869 isym
->st_shndx
= SHN_UNDEF
;
4871 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4875 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4878 goto error_free_vers
;
4880 if (isym
->st_shndx
== SHN_COMMON
4881 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4883 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4887 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4889 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4891 goto error_free_vers
;
4895 else if (isym
->st_shndx
== SHN_COMMON
4896 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4897 && !bfd_link_relocatable (info
))
4899 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4903 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4904 | SEC_LINKER_CREATED
);
4905 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4907 goto error_free_vers
;
4911 else if (bed
->elf_add_symbol_hook
)
4913 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4915 goto error_free_vers
;
4917 /* The hook function sets the name to NULL if this symbol
4918 should be skipped for some reason. */
4923 /* Sanity check that all possibilities were handled. */
4927 /* Silently discard TLS symbols from --just-syms. There's
4928 no way to combine a static TLS block with a new TLS block
4929 for this executable. */
4930 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4931 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4934 if (bfd_is_und_section (sec
)
4935 || bfd_is_com_section (sec
))
4940 size_change_ok
= false;
4941 type_change_ok
= bed
->type_change_ok
;
4948 if (is_elf_hash_table (&htab
->root
))
4950 Elf_Internal_Versym iver
;
4951 unsigned int vernum
= 0;
4956 if (info
->default_imported_symver
)
4957 /* Use the default symbol version created earlier. */
4958 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4962 else if (ever
>= extversym_end
)
4964 /* xgettext:c-format */
4965 _bfd_error_handler (_("%pB: not enough version information"),
4967 bfd_set_error (bfd_error_bad_value
);
4968 goto error_free_vers
;
4971 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4973 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4975 /* If this is a hidden symbol, or if it is not version
4976 1, we append the version name to the symbol name.
4977 However, we do not modify a non-hidden absolute symbol
4978 if it is not a function, because it might be the version
4979 symbol itself. FIXME: What if it isn't? */
4980 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4982 && (!bfd_is_abs_section (sec
)
4983 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4986 size_t namelen
, verlen
, newlen
;
4989 if (isym
->st_shndx
!= SHN_UNDEF
)
4991 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4993 else if (vernum
> 1)
4995 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
5002 /* xgettext:c-format */
5003 (_("%pB: %s: invalid version %u (max %d)"),
5005 elf_tdata (abfd
)->cverdefs
);
5006 bfd_set_error (bfd_error_bad_value
);
5007 goto error_free_vers
;
5012 /* We cannot simply test for the number of
5013 entries in the VERNEED section since the
5014 numbers for the needed versions do not start
5016 Elf_Internal_Verneed
*t
;
5019 for (t
= elf_tdata (abfd
)->verref
;
5023 Elf_Internal_Vernaux
*a
;
5025 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5027 if (a
->vna_other
== vernum
)
5029 verstr
= a
->vna_nodename
;
5039 /* xgettext:c-format */
5040 (_("%pB: %s: invalid needed version %d"),
5041 abfd
, name
, vernum
);
5042 bfd_set_error (bfd_error_bad_value
);
5043 goto error_free_vers
;
5047 namelen
= strlen (name
);
5048 verlen
= strlen (verstr
);
5049 newlen
= namelen
+ verlen
+ 2;
5050 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
5051 && isym
->st_shndx
!= SHN_UNDEF
)
5054 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
5055 if (newname
== NULL
)
5056 goto error_free_vers
;
5057 memcpy (newname
, name
, namelen
);
5058 p
= newname
+ namelen
;
5060 /* If this is a defined non-hidden version symbol,
5061 we add another @ to the name. This indicates the
5062 default version of the symbol. */
5063 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
5064 && isym
->st_shndx
!= SHN_UNDEF
)
5066 memcpy (p
, verstr
, verlen
+ 1);
5071 /* If this symbol has default visibility and the user has
5072 requested we not re-export it, then mark it as hidden. */
5073 if (!bfd_is_und_section (sec
)
5076 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
5077 isym
->st_other
= (STV_HIDDEN
5078 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
5080 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
5081 sym_hash
, &old_bfd
, &old_weak
,
5082 &old_alignment
, &skip
, &override
,
5083 &type_change_ok
, &size_change_ok
,
5085 goto error_free_vers
;
5090 /* Override a definition only if the new symbol matches the
5092 if (override
&& matched
)
5096 while (h
->root
.type
== bfd_link_hash_indirect
5097 || h
->root
.type
== bfd_link_hash_warning
)
5098 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5100 if (h
->versioned
!= unversioned
5101 && elf_tdata (abfd
)->verdef
!= NULL
5104 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
5107 if (! (_bfd_generic_link_add_one_symbol
5108 (info
, override
? override
: abfd
, name
, flags
, sec
, value
,
5109 NULL
, false, bed
->collect
,
5110 (struct bfd_link_hash_entry
**) sym_hash
)))
5111 goto error_free_vers
;
5114 /* We need to make sure that indirect symbol dynamic flags are
5117 while (h
->root
.type
== bfd_link_hash_indirect
5118 || h
->root
.type
== bfd_link_hash_warning
)
5119 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5123 /* Setting the index to -3 tells elf_link_output_extsym that
5124 this symbol is defined in a discarded section. */
5125 if (discarded
&& is_elf_hash_table (&htab
->root
))
5128 new_weak
= (flags
& BSF_WEAK
) != 0;
5132 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
5133 && is_elf_hash_table (&htab
->root
)
5134 && h
->u
.alias
== NULL
)
5136 /* Keep a list of all weak defined non function symbols from
5137 a dynamic object, using the alias field. Later in this
5138 function we will set the alias field to the correct
5139 value. We only put non-function symbols from dynamic
5140 objects on this list, because that happens to be the only
5141 time we need to know the normal symbol corresponding to a
5142 weak symbol, and the information is time consuming to
5143 figure out. If the alias field is not already NULL,
5144 then this symbol was already defined by some previous
5145 dynamic object, and we will be using that previous
5146 definition anyhow. */
5152 /* Set the alignment of a common symbol. */
5153 if ((common
|| bfd_is_com_section (sec
))
5154 && h
->root
.type
== bfd_link_hash_common
)
5159 align
= bfd_log2 (isym
->st_value
);
5162 /* The new symbol is a common symbol in a shared object.
5163 We need to get the alignment from the section. */
5164 align
= new_sec
->alignment_power
;
5166 if (align
> old_alignment
)
5167 h
->root
.u
.c
.p
->alignment_power
= align
;
5169 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
5172 if (is_elf_hash_table (&htab
->root
))
5174 /* Set a flag in the hash table entry indicating the type of
5175 reference or definition we just found. A dynamic symbol
5176 is one which is referenced or defined by both a regular
5177 object and a shared object. */
5178 bool dynsym
= false;
5180 /* Plugin symbols aren't normal. Don't set def/ref flags. */
5181 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5183 /* Except for this flag to track nonweak references. */
5185 && bind
!= STB_WEAK
)
5186 h
->ref_ir_nonweak
= 1;
5193 if (bind
!= STB_WEAK
)
5194 h
->ref_regular_nonweak
= 1;
5211 hi
->ref_dynamic
= 1;
5216 hi
->def_dynamic
= 1;
5220 /* If an indirect symbol has been forced local, don't
5221 make the real symbol dynamic. */
5222 if (h
!= hi
&& hi
->forced_local
)
5226 if (bfd_link_dll (info
)
5236 && weakdef (h
)->dynindx
!= -1))
5240 /* Check to see if we need to add an indirect symbol for
5241 the default name. */
5243 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5245 && hi
->versioned
== versioned_hidden
))
5246 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5247 sec
, value
, &old_bfd
, &dynsym
))
5248 goto error_free_vers
;
5250 /* Check the alignment when a common symbol is involved. This
5251 can change when a common symbol is overridden by a normal
5252 definition or a common symbol is ignored due to the old
5253 normal definition. We need to make sure the maximum
5254 alignment is maintained. */
5255 if ((old_alignment
|| common
)
5256 && h
->root
.type
!= bfd_link_hash_common
)
5258 unsigned int common_align
;
5259 unsigned int normal_align
;
5260 unsigned int symbol_align
;
5264 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5265 || h
->root
.type
== bfd_link_hash_defweak
);
5267 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5268 if (h
->root
.u
.def
.section
->owner
!= NULL
5269 && (h
->root
.u
.def
.section
->owner
->flags
5270 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5272 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5273 if (normal_align
> symbol_align
)
5274 normal_align
= symbol_align
;
5277 normal_align
= symbol_align
;
5281 common_align
= old_alignment
;
5282 common_bfd
= old_bfd
;
5287 common_align
= bfd_log2 (isym
->st_value
);
5289 normal_bfd
= old_bfd
;
5292 if (normal_align
< common_align
)
5294 /* PR binutils/2735 */
5295 if (normal_bfd
== NULL
)
5297 /* xgettext:c-format */
5298 (_("warning: alignment %u of common symbol `%s' in %pB is"
5299 " greater than the alignment (%u) of its section %pA"),
5300 1 << common_align
, name
, common_bfd
,
5301 1 << normal_align
, h
->root
.u
.def
.section
);
5304 /* xgettext:c-format */
5305 (_("warning: alignment %u of normal symbol `%s' in %pB"
5306 " is smaller than %u used by the common definition in %pB"),
5307 1 << normal_align
, name
, normal_bfd
,
5308 1 << common_align
, common_bfd
);
5310 /* PR 30499: make sure that users understand that this warning is serious. */
5312 (_("warning: NOTE: alignment discrepancies can cause real problems. Investigation is advised."));
5316 /* Remember the symbol size if it isn't undefined. */
5317 if (isym
->st_size
!= 0
5318 && isym
->st_shndx
!= SHN_UNDEF
5319 && (definition
|| h
->size
== 0))
5322 && h
->size
!= isym
->st_size
5323 && ! size_change_ok
)
5326 /* xgettext:c-format */
5327 (_("warning: size of symbol `%s' changed"
5328 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5329 name
, (uint64_t) h
->size
, old_bfd
,
5330 (uint64_t) isym
->st_size
, abfd
);
5332 /* PR 30499: make sure that users understand that this warning is serious. */
5334 (_("warning: NOTE: size discrepancies can cause real problems. Investigation is advised."));
5337 h
->size
= isym
->st_size
;
5340 /* If this is a common symbol, then we always want H->SIZE
5341 to be the size of the common symbol. The code just above
5342 won't fix the size if a common symbol becomes larger. We
5343 don't warn about a size change here, because that is
5344 covered by --warn-common. Allow changes between different
5346 if (h
->root
.type
== bfd_link_hash_common
)
5347 h
->size
= h
->root
.u
.c
.size
;
5349 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5350 && ((definition
&& !new_weak
)
5351 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5352 || h
->type
== STT_NOTYPE
))
5354 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5356 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5358 if (type
== STT_GNU_IFUNC
5359 && (abfd
->flags
& DYNAMIC
) != 0)
5362 if (h
->type
!= type
)
5364 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5365 /* xgettext:c-format */
5367 (_("warning: type of symbol `%s' changed"
5368 " from %d to %d in %pB"),
5369 name
, h
->type
, type
, abfd
);
5375 /* Merge st_other field. */
5376 elf_merge_st_other (abfd
, h
, isym
->st_other
, sec
,
5377 definition
, dynamic
);
5379 /* We don't want to make debug symbol dynamic. */
5381 && (sec
->flags
& SEC_DEBUGGING
)
5382 && !bfd_link_relocatable (info
))
5385 /* Nor should we make plugin symbols dynamic. */
5386 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5391 h
->target_internal
= isym
->st_target_internal
;
5392 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5395 /* Don't add indirect symbols for .symver x, x@FOO aliases
5396 in IR. Since all data or text symbols in IR have the
5397 same type, value and section, we can't tell if a symbol
5398 is an alias of another symbol by their types, values and
5402 && (abfd
->flags
& BFD_PLUGIN
) == 0)
5404 char *p
= strchr (name
, ELF_VER_CHR
);
5405 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5407 /* Queue non-default versions so that .symver x, x@FOO
5408 aliases can be checked. */
5411 size_t amt
= ((isymend
- isym
+ 1)
5412 * sizeof (struct elf_link_hash_entry
*));
5414 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5416 goto error_free_vers
;
5418 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5422 if (dynsym
&& h
->dynindx
== -1)
5424 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5425 goto error_free_vers
;
5427 && weakdef (h
)->dynindx
== -1)
5429 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5430 goto error_free_vers
;
5433 else if (h
->dynindx
!= -1)
5434 /* If the symbol already has a dynamic index, but
5435 visibility says it should not be visible, turn it into
5437 switch (ELF_ST_VISIBILITY (h
->other
))
5441 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
5449 && h
->root
.type
!= bfd_link_hash_indirect
5451 && h
->ref_regular_nonweak
)
5453 && (old_bfd
->flags
& BFD_PLUGIN
) != 0
5454 && h
->ref_ir_nonweak
5455 && !info
->lto_all_symbols_read
)
5456 || (h
->ref_dynamic_nonweak
5457 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5458 && !on_needed_list (elf_dt_name (abfd
),
5459 htab
->needed
, NULL
))))
5461 const char *soname
= elf_dt_name (abfd
);
5463 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5464 h
->root
.root
.string
);
5466 /* A symbol from a library loaded via DT_NEEDED of some
5467 other library is referenced by a regular object.
5468 Add a DT_NEEDED entry for it. Issue an error if
5469 --no-add-needed is used and the reference was not
5472 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5475 /* xgettext:c-format */
5476 (_("%pB: undefined reference to symbol '%s'"),
5478 bfd_set_error (bfd_error_missing_dso
);
5479 goto error_free_vers
;
5482 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5483 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5485 /* Create dynamic sections for backends that require
5486 that be done before setup_gnu_properties. */
5487 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5494 if (info
->lto_plugin_active
5495 && !bfd_link_relocatable (info
)
5496 && (abfd
->flags
& BFD_PLUGIN
) == 0
5502 if (bed
->s
->arch_size
== 32)
5507 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5508 referenced in regular objects so that linker plugin will get
5509 the correct symbol resolution. */
5511 sym_hash
= elf_sym_hashes (abfd
);
5512 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5514 Elf_Internal_Rela
*internal_relocs
;
5515 Elf_Internal_Rela
*rel
, *relend
;
5517 /* Don't check relocations in excluded sections. */
5518 if ((s
->flags
& SEC_RELOC
) == 0
5519 || s
->reloc_count
== 0
5520 || (s
->flags
& SEC_EXCLUDE
) != 0
5521 || ((info
->strip
== strip_all
5522 || info
->strip
== strip_debugger
)
5523 && (s
->flags
& SEC_DEBUGGING
) != 0))
5526 internal_relocs
= _bfd_elf_link_info_read_relocs (abfd
, info
,
5529 _bfd_link_keep_memory (info
));
5530 if (internal_relocs
== NULL
)
5531 goto error_free_vers
;
5533 rel
= internal_relocs
;
5534 relend
= rel
+ s
->reloc_count
;
5535 for ( ; rel
< relend
; rel
++)
5537 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5538 struct elf_link_hash_entry
*h
;
5540 /* Skip local symbols. */
5541 if (r_symndx
< extsymoff
)
5544 h
= sym_hash
[r_symndx
- extsymoff
];
5546 h
->root
.non_ir_ref_regular
= 1;
5549 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5550 free (internal_relocs
);
5559 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5563 /* Restore the symbol table. */
5564 old_ent
= (char *) old_tab
+ tabsize
;
5565 memset (elf_sym_hashes (abfd
), 0,
5566 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5567 htab
->root
.table
.table
= old_table
;
5568 htab
->root
.table
.size
= old_size
;
5569 htab
->root
.table
.count
= old_count
;
5570 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5571 htab
->root
.undefs
= old_undefs
;
5572 htab
->root
.undefs_tail
= old_undefs_tail
;
5573 if (htab
->dynstr
!= NULL
)
5574 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5577 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5579 struct bfd_hash_entry
*p
;
5580 struct elf_link_hash_entry
*h
;
5581 unsigned int non_ir_ref_dynamic
;
5583 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5585 /* Preserve non_ir_ref_dynamic so that this symbol
5586 will be exported when the dynamic lib becomes needed
5587 in the second pass. */
5588 h
= (struct elf_link_hash_entry
*) p
;
5589 if (h
->root
.type
== bfd_link_hash_warning
)
5590 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5591 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5593 h
= (struct elf_link_hash_entry
*) p
;
5594 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5595 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5596 if (h
->root
.type
== bfd_link_hash_warning
)
5598 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5599 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5600 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5602 if (h
->root
.type
== bfd_link_hash_common
)
5604 memcpy (h
->root
.u
.c
.p
, old_ent
, sizeof (*h
->root
.u
.c
.p
));
5605 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
5607 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5611 /* Make a special call to the linker "notice" function to
5612 tell it that symbols added for crefs may need to be removed. */
5613 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5614 goto error_free_vers
;
5617 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5619 free (nondeflt_vers
);
5623 if (old_tab
!= NULL
)
5625 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5626 goto error_free_vers
;
5631 /* Now that all the symbols from this input file are created, if
5632 not performing a relocatable link, handle .symver foo, foo@BAR
5633 such that any relocs against foo become foo@BAR. */
5634 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5638 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5640 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5641 char *shortname
, *p
;
5644 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5646 || (h
->root
.type
!= bfd_link_hash_defined
5647 && h
->root
.type
!= bfd_link_hash_defweak
))
5650 amt
= p
- h
->root
.root
.string
;
5651 shortname
= (char *) bfd_malloc (amt
+ 1);
5653 goto error_free_vers
;
5654 memcpy (shortname
, h
->root
.root
.string
, amt
);
5655 shortname
[amt
] = '\0';
5657 hi
= (struct elf_link_hash_entry
*)
5658 bfd_link_hash_lookup (&htab
->root
, shortname
,
5659 false, false, false);
5661 && hi
->root
.type
== h
->root
.type
5662 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5663 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5665 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
5666 hi
->root
.type
= bfd_link_hash_indirect
;
5667 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5668 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5669 sym_hash
= elf_sym_hashes (abfd
);
5671 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5672 if (sym_hash
[symidx
] == hi
)
5674 sym_hash
[symidx
] = h
;
5680 free (nondeflt_vers
);
5681 nondeflt_vers
= NULL
;
5684 /* Now set the alias field correctly for all the weak defined
5685 symbols we found. The only way to do this is to search all the
5686 symbols. Since we only need the information for non functions in
5687 dynamic objects, that's the only time we actually put anything on
5688 the list WEAKS. We need this information so that if a regular
5689 object refers to a symbol defined weakly in a dynamic object, the
5690 real symbol in the dynamic object is also put in the dynamic
5691 symbols; we also must arrange for both symbols to point to the
5692 same memory location. We could handle the general case of symbol
5693 aliasing, but a general symbol alias can only be generated in
5694 assembler code, handling it correctly would be very time
5695 consuming, and other ELF linkers don't handle general aliasing
5699 struct elf_link_hash_entry
**hpp
;
5700 struct elf_link_hash_entry
**hppend
;
5701 struct elf_link_hash_entry
**sorted_sym_hash
;
5702 struct elf_link_hash_entry
*h
;
5703 size_t sym_count
, amt
;
5705 /* Since we have to search the whole symbol list for each weak
5706 defined symbol, search time for N weak defined symbols will be
5707 O(N^2). Binary search will cut it down to O(NlogN). */
5708 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5709 sorted_sym_hash
= bfd_malloc (amt
);
5710 if (sorted_sym_hash
== NULL
)
5712 sym_hash
= sorted_sym_hash
;
5713 hpp
= elf_sym_hashes (abfd
);
5714 hppend
= hpp
+ extsymcount
;
5716 for (; hpp
< hppend
; hpp
++)
5720 && h
->root
.type
== bfd_link_hash_defined
5721 && !bed
->is_function_type (h
->type
))
5729 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5732 while (weaks
!= NULL
)
5734 struct elf_link_hash_entry
*hlook
;
5737 size_t i
, j
, idx
= 0;
5740 weaks
= hlook
->u
.alias
;
5741 hlook
->u
.alias
= NULL
;
5743 if (hlook
->root
.type
!= bfd_link_hash_defined
5744 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5747 slook
= hlook
->root
.u
.def
.section
;
5748 vlook
= hlook
->root
.u
.def
.value
;
5754 bfd_signed_vma vdiff
;
5756 h
= sorted_sym_hash
[idx
];
5757 vdiff
= vlook
- h
->root
.u
.def
.value
;
5764 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5774 /* We didn't find a value/section match. */
5778 /* With multiple aliases, or when the weak symbol is already
5779 strongly defined, we have multiple matching symbols and
5780 the binary search above may land on any of them. Step
5781 one past the matching symbol(s). */
5784 h
= sorted_sym_hash
[idx
];
5785 if (h
->root
.u
.def
.section
!= slook
5786 || h
->root
.u
.def
.value
!= vlook
)
5790 /* Now look back over the aliases. Since we sorted by size
5791 as well as value and section, we'll choose the one with
5792 the largest size. */
5795 h
= sorted_sym_hash
[idx
];
5797 /* Stop if value or section doesn't match. */
5798 if (h
->root
.u
.def
.section
!= slook
5799 || h
->root
.u
.def
.value
!= vlook
)
5801 else if (h
!= hlook
)
5803 struct elf_link_hash_entry
*t
;
5806 hlook
->is_weakalias
= 1;
5808 if (t
->u
.alias
!= NULL
)
5809 while (t
->u
.alias
!= h
)
5813 /* If the weak definition is in the list of dynamic
5814 symbols, make sure the real definition is put
5816 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5818 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5821 free (sorted_sym_hash
);
5826 /* If the real definition is in the list of dynamic
5827 symbols, make sure the weak definition is put
5828 there as well. If we don't do this, then the
5829 dynamic loader might not merge the entries for the
5830 real definition and the weak definition. */
5831 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5833 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5834 goto err_free_sym_hash
;
5841 free (sorted_sym_hash
);
5844 if (bed
->check_directives
5845 && !(*bed
->check_directives
) (abfd
, info
))
5848 /* If this is a non-traditional link, try to optimize the handling
5849 of the .stab/.stabstr sections. */
5851 && ! info
->traditional_format
5852 && is_elf_hash_table (&htab
->root
)
5853 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5857 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5858 if (stabstr
!= NULL
)
5860 bfd_size_type string_offset
= 0;
5863 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5864 if (startswith (stab
->name
, ".stab")
5865 && (!stab
->name
[5] ||
5866 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5867 && (stab
->flags
& SEC_MERGE
) == 0
5868 && !bfd_is_abs_section (stab
->output_section
))
5870 struct bfd_elf_section_data
*secdata
;
5872 secdata
= elf_section_data (stab
);
5873 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5874 stabstr
, &secdata
->sec_info
,
5877 if (secdata
->sec_info
)
5878 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5883 if (dynamic
&& add_needed
)
5885 /* Add this bfd to the loaded list. */
5886 struct elf_link_loaded_list
*n
;
5888 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5892 n
->next
= htab
->dyn_loaded
;
5893 htab
->dyn_loaded
= n
;
5895 if (dynamic
&& !add_needed
5896 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5897 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5904 free (nondeflt_vers
);
5912 /* Return the linker hash table entry of a symbol that might be
5913 satisfied by an archive symbol. Return -1 on error. */
5915 struct bfd_link_hash_entry
*
5916 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5917 struct bfd_link_info
*info
,
5920 struct bfd_link_hash_entry
*h
;
5924 h
= bfd_link_hash_lookup (info
->hash
, name
, false, false, true);
5928 /* If this is a default version (the name contains @@), look up the
5929 symbol again with only one `@' as well as without the version.
5930 The effect is that references to the symbol with and without the
5931 version will be matched by the default symbol in the archive. */
5933 p
= strchr (name
, ELF_VER_CHR
);
5934 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5937 /* First check with only one `@'. */
5938 len
= strlen (name
);
5939 copy
= (char *) bfd_alloc (abfd
, len
);
5941 return (struct bfd_link_hash_entry
*) -1;
5943 first
= p
- name
+ 1;
5944 memcpy (copy
, name
, first
);
5945 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5947 h
= bfd_link_hash_lookup (info
->hash
, copy
, false, false, true);
5950 /* We also need to check references to the symbol without the
5952 copy
[first
- 1] = '\0';
5953 h
= bfd_link_hash_lookup (info
->hash
, copy
, false, false, true);
5956 bfd_release (abfd
, copy
);
5960 /* Add symbols from an ELF archive file to the linker hash table. We
5961 don't use _bfd_generic_link_add_archive_symbols because we need to
5962 handle versioned symbols.
5964 Fortunately, ELF archive handling is simpler than that done by
5965 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5966 oddities. In ELF, if we find a symbol in the archive map, and the
5967 symbol is currently undefined, we know that we must pull in that
5970 Unfortunately, we do have to make multiple passes over the symbol
5971 table until nothing further is resolved. */
5974 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5977 unsigned char *included
= NULL
;
5981 const struct elf_backend_data
*bed
;
5982 struct bfd_link_hash_entry
* (*archive_symbol_lookup
)
5983 (bfd
*, struct bfd_link_info
*, const char *);
5985 if (! bfd_has_map (abfd
))
5987 /* An empty archive is a special case. */
5988 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5990 bfd_set_error (bfd_error_no_armap
);
5994 /* Keep track of all symbols we know to be already defined, and all
5995 files we know to be already included. This is to speed up the
5996 second and subsequent passes. */
5997 c
= bfd_ardata (abfd
)->symdef_count
;
6000 amt
= c
* sizeof (*included
);
6001 included
= (unsigned char *) bfd_zmalloc (amt
);
6002 if (included
== NULL
)
6005 symdefs
= bfd_ardata (abfd
)->symdefs
;
6006 bed
= get_elf_backend_data (abfd
);
6007 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
6020 symdefend
= symdef
+ c
;
6021 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
6023 struct bfd_link_hash_entry
*h
;
6025 struct bfd_link_hash_entry
*undefs_tail
;
6030 if (symdef
->file_offset
== last
)
6036 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
6037 if (h
== (struct bfd_link_hash_entry
*) -1)
6043 if (h
->type
== bfd_link_hash_undefined
)
6045 /* If the archive element has already been loaded then one
6046 of the symbols defined by that element might have been
6047 made undefined due to being in a discarded section. */
6048 if (is_elf_hash_table (info
->hash
)
6049 && ((struct elf_link_hash_entry
*) h
)->indx
== -3)
6052 else if (h
->type
== bfd_link_hash_common
)
6054 /* We currently have a common symbol. The archive map contains
6055 a reference to this symbol, so we may want to include it. We
6056 only want to include it however, if this archive element
6057 contains a definition of the symbol, not just another common
6060 Unfortunately some archivers (including GNU ar) will put
6061 declarations of common symbols into their archive maps, as
6062 well as real definitions, so we cannot just go by the archive
6063 map alone. Instead we must read in the element's symbol
6064 table and check that to see what kind of symbol definition
6066 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
6071 if (h
->type
!= bfd_link_hash_undefweak
)
6072 /* Symbol must be defined. Don't check it again. */
6077 /* We need to include this archive member. */
6078 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
,
6080 if (element
== NULL
)
6083 if (! bfd_check_format (element
, bfd_object
))
6086 undefs_tail
= info
->hash
->undefs_tail
;
6088 if (!(*info
->callbacks
6089 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
6091 if (!bfd_link_add_symbols (element
, info
))
6094 /* If there are any new undefined symbols, we need to make
6095 another pass through the archive in order to see whether
6096 they can be defined. FIXME: This isn't perfect, because
6097 common symbols wind up on undefs_tail and because an
6098 undefined symbol which is defined later on in this pass
6099 does not require another pass. This isn't a bug, but it
6100 does make the code less efficient than it could be. */
6101 if (undefs_tail
!= info
->hash
->undefs_tail
)
6104 /* Look backward to mark all symbols from this object file
6105 which we have already seen in this pass. */
6109 included
[mark
] = true;
6114 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
6116 /* We mark subsequent symbols from this object file as we go
6117 on through the loop. */
6118 last
= symdef
->file_offset
;
6131 /* Given an ELF BFD, add symbols to the global hash table as
6135 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
6137 switch (bfd_get_format (abfd
))
6140 return elf_link_add_object_symbols (abfd
, info
);
6142 return elf_link_add_archive_symbols (abfd
, info
);
6144 bfd_set_error (bfd_error_wrong_format
);
6149 struct hash_codes_info
6151 unsigned long *hashcodes
;
6155 /* This function will be called though elf_link_hash_traverse to store
6156 all hash value of the exported symbols in an array. */
6159 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6161 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
6166 /* Ignore indirect symbols. These are added by the versioning code. */
6167 if (h
->dynindx
== -1)
6170 name
= h
->root
.root
.string
;
6171 if (h
->versioned
>= versioned
)
6173 char *p
= strchr (name
, ELF_VER_CHR
);
6176 alc
= (char *) bfd_malloc (p
- name
+ 1);
6182 memcpy (alc
, name
, p
- name
);
6183 alc
[p
- name
] = '\0';
6188 /* Compute the hash value. */
6189 ha
= bfd_elf_hash (name
);
6191 /* Store the found hash value in the array given as the argument. */
6192 *(inf
->hashcodes
)++ = ha
;
6194 /* And store it in the struct so that we can put it in the hash table
6196 h
->u
.elf_hash_value
= ha
;
6202 struct collect_gnu_hash_codes
6205 const struct elf_backend_data
*bed
;
6206 unsigned long int nsyms
;
6207 unsigned long int maskbits
;
6208 unsigned long int *hashcodes
;
6209 unsigned long int *hashval
;
6210 unsigned long int *indx
;
6211 unsigned long int *counts
;
6215 long int min_dynindx
;
6216 unsigned long int bucketcount
;
6217 unsigned long int symindx
;
6218 long int local_indx
;
6219 long int shift1
, shift2
;
6220 unsigned long int mask
;
6224 /* This function will be called though elf_link_hash_traverse to store
6225 all hash value of the exported symbols in an array. */
6228 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6230 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6235 /* Ignore indirect symbols. These are added by the versioning code. */
6236 if (h
->dynindx
== -1)
6239 /* Ignore also local symbols and undefined symbols. */
6240 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6243 name
= h
->root
.root
.string
;
6244 if (h
->versioned
>= versioned
)
6246 char *p
= strchr (name
, ELF_VER_CHR
);
6249 alc
= (char *) bfd_malloc (p
- name
+ 1);
6255 memcpy (alc
, name
, p
- name
);
6256 alc
[p
- name
] = '\0';
6261 /* Compute the hash value. */
6262 ha
= bfd_elf_gnu_hash (name
);
6264 /* Store the found hash value in the array for compute_bucket_count,
6265 and also for .dynsym reordering purposes. */
6266 s
->hashcodes
[s
->nsyms
] = ha
;
6267 s
->hashval
[h
->dynindx
] = ha
;
6269 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6270 s
->min_dynindx
= h
->dynindx
;
6276 /* This function will be called though elf_link_hash_traverse to do
6277 final dynamic symbol renumbering in case of .gnu.hash.
6278 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6279 to the translation table. */
6282 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6284 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6285 unsigned long int bucket
;
6286 unsigned long int val
;
6288 /* Ignore indirect symbols. */
6289 if (h
->dynindx
== -1)
6292 /* Ignore also local symbols and undefined symbols. */
6293 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6295 if (h
->dynindx
>= s
->min_dynindx
)
6297 if (s
->bed
->record_xhash_symbol
!= NULL
)
6299 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6303 h
->dynindx
= s
->local_indx
++;
6308 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6309 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6310 & ((s
->maskbits
>> s
->shift1
) - 1);
6311 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6313 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6314 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6315 if (s
->counts
[bucket
] == 1)
6316 /* Last element terminates the chain. */
6318 bfd_put_32 (s
->output_bfd
, val
,
6319 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6320 --s
->counts
[bucket
];
6321 if (s
->bed
->record_xhash_symbol
!= NULL
)
6323 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6325 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6328 h
->dynindx
= s
->indx
[bucket
]++;
6332 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6335 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6337 return !(h
->forced_local
6338 || h
->root
.type
== bfd_link_hash_undefined
6339 || h
->root
.type
== bfd_link_hash_undefweak
6340 || ((h
->root
.type
== bfd_link_hash_defined
6341 || h
->root
.type
== bfd_link_hash_defweak
)
6342 && h
->root
.u
.def
.section
->output_section
== NULL
));
6345 /* Array used to determine the number of hash table buckets to use
6346 based on the number of symbols there are. If there are fewer than
6347 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6348 fewer than 37 we use 17 buckets, and so forth. We never use more
6349 than 32771 buckets. */
6351 static const size_t elf_buckets
[] =
6353 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6357 /* Compute bucket count for hashing table. We do not use a static set
6358 of possible tables sizes anymore. Instead we determine for all
6359 possible reasonable sizes of the table the outcome (i.e., the
6360 number of collisions etc) and choose the best solution. The
6361 weighting functions are not too simple to allow the table to grow
6362 without bounds. Instead one of the weighting factors is the size.
6363 Therefore the result is always a good payoff between few collisions
6364 (= short chain lengths) and table size. */
6366 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6367 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6368 unsigned long int nsyms
,
6371 size_t best_size
= 0;
6372 unsigned long int i
;
6378 uint64_t best_chlen
= ~((uint64_t) 0);
6379 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6380 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6381 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6382 unsigned long int *counts
;
6384 unsigned int no_improvement_count
= 0;
6386 /* Possible optimization parameters: if we have NSYMS symbols we say
6387 that the hashing table must at least have NSYMS/4 and at most
6389 minsize
= nsyms
/ 4;
6392 best_size
= maxsize
= nsyms
* 2;
6397 if ((best_size
& 31) == 0)
6401 /* Create array where we count the collisions in. We must use bfd_malloc
6402 since the size could be large. */
6404 amt
*= sizeof (unsigned long int);
6405 counts
= (unsigned long int *) bfd_malloc (amt
);
6409 /* Compute the "optimal" size for the hash table. The criteria is a
6410 minimal chain length. The minor criteria is (of course) the size
6412 for (i
= minsize
; i
< maxsize
; ++i
)
6414 /* Walk through the array of hashcodes and count the collisions. */
6416 unsigned long int j
;
6417 unsigned long int fact
;
6419 if (gnu_hash
&& (i
& 31) == 0)
6422 memset (counts
, '\0', i
* sizeof (unsigned long int));
6424 /* Determine how often each hash bucket is used. */
6425 for (j
= 0; j
< nsyms
; ++j
)
6426 ++counts
[hashcodes
[j
] % i
];
6428 /* For the weight function we need some information about the
6429 pagesize on the target. This is information need not be 100%
6430 accurate. Since this information is not available (so far) we
6431 define it here to a reasonable default value. If it is crucial
6432 to have a better value some day simply define this value. */
6433 # ifndef BFD_TARGET_PAGESIZE
6434 # define BFD_TARGET_PAGESIZE (4096)
6437 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6439 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6442 /* Variant 1: optimize for short chains. We add the squares
6443 of all the chain lengths (which favors many small chain
6444 over a few long chains). */
6445 for (j
= 0; j
< i
; ++j
)
6446 max
+= counts
[j
] * counts
[j
];
6448 /* This adds penalties for the overall size of the table. */
6449 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6452 /* Variant 2: Optimize a lot more for small table. Here we
6453 also add squares of the size but we also add penalties for
6454 empty slots (the +1 term). */
6455 for (j
= 0; j
< i
; ++j
)
6456 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6458 /* The overall size of the table is considered, but not as
6459 strong as in variant 1, where it is squared. */
6460 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6464 /* Compare with current best results. */
6465 if (max
< best_chlen
)
6469 no_improvement_count
= 0;
6471 /* PR 11843: Avoid futile long searches for the best bucket size
6472 when there are a large number of symbols. */
6473 else if (++no_improvement_count
== 100)
6481 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6483 best_size
= elf_buckets
[i
];
6484 if (nsyms
< elf_buckets
[i
+ 1])
6487 if (gnu_hash
&& best_size
< 2)
6494 /* Size any SHT_GROUP section for ld -r. */
6497 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6502 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6503 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6504 && (s
= ibfd
->sections
) != NULL
6505 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6506 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6511 /* Set a default stack segment size. The value in INFO wins. If it
6512 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6513 undefined it is initialized. */
6516 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6517 struct bfd_link_info
*info
,
6518 const char *legacy_symbol
,
6519 bfd_vma default_size
)
6521 struct elf_link_hash_entry
*h
= NULL
;
6523 /* Look for legacy symbol. */
6525 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6526 false, false, false);
6527 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6528 || h
->root
.type
== bfd_link_hash_defweak
)
6530 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6532 /* The symbol has no type if specified on the command line. */
6533 h
->type
= STT_OBJECT
;
6534 if (info
->stacksize
)
6535 /* xgettext:c-format */
6536 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6537 output_bfd
, legacy_symbol
);
6538 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6539 /* xgettext:c-format */
6540 _bfd_error_handler (_("%pB: %s not absolute"),
6541 output_bfd
, legacy_symbol
);
6543 info
->stacksize
= h
->root
.u
.def
.value
;
6546 if (!info
->stacksize
)
6547 /* If the user didn't set a size, or explicitly inhibit the
6548 size, set it now. */
6549 info
->stacksize
= default_size
;
6551 /* Provide the legacy symbol, if it is referenced. */
6552 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6553 || h
->root
.type
== bfd_link_hash_undefweak
))
6555 struct bfd_link_hash_entry
*bh
= NULL
;
6557 if (!(_bfd_generic_link_add_one_symbol
6558 (info
, output_bfd
, legacy_symbol
,
6559 BSF_GLOBAL
, bfd_abs_section_ptr
,
6560 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6561 NULL
, false, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6564 h
= (struct elf_link_hash_entry
*) bh
;
6566 h
->type
= STT_OBJECT
;
6572 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6574 struct elf_gc_sweep_symbol_info
6576 struct bfd_link_info
*info
;
6577 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6582 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6585 && (((h
->root
.type
== bfd_link_hash_defined
6586 || h
->root
.type
== bfd_link_hash_defweak
)
6587 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6588 && h
->root
.u
.def
.section
->gc_mark
))
6589 || h
->root
.type
== bfd_link_hash_undefined
6590 || h
->root
.type
== bfd_link_hash_undefweak
))
6592 struct elf_gc_sweep_symbol_info
*inf
;
6594 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6595 (*inf
->hide_symbol
) (inf
->info
, h
, true);
6598 h
->ref_regular_nonweak
= 0;
6604 /* Set up the sizes and contents of the ELF dynamic sections. This is
6605 called by the ELF linker emulation before_allocation routine. We
6606 must set the sizes of the sections before the linker sets the
6607 addresses of the various sections. */
6610 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6613 const char *filter_shlib
,
6615 const char *depaudit
,
6616 const char * const *auxiliary_filters
,
6617 struct bfd_link_info
*info
,
6618 asection
**sinterpptr
)
6621 const struct elf_backend_data
*bed
;
6625 if (!is_elf_hash_table (info
->hash
))
6628 /* Any syms created from now on start with -1 in
6629 got.refcount/offset and plt.refcount/offset. */
6630 elf_hash_table (info
)->init_got_refcount
6631 = elf_hash_table (info
)->init_got_offset
;
6632 elf_hash_table (info
)->init_plt_refcount
6633 = elf_hash_table (info
)->init_plt_offset
;
6635 bed
= get_elf_backend_data (output_bfd
);
6637 /* The backend may have to create some sections regardless of whether
6638 we're dynamic or not. */
6639 if (bed
->elf_backend_always_size_sections
6640 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6643 dynobj
= elf_hash_table (info
)->dynobj
;
6645 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6647 struct bfd_elf_version_tree
*verdefs
;
6648 struct elf_info_failed asvinfo
;
6649 struct bfd_elf_version_tree
*t
;
6650 struct bfd_elf_version_expr
*d
;
6654 /* If we are supposed to export all symbols into the dynamic symbol
6655 table (this is not the normal case), then do so. */
6656 if (info
->export_dynamic
6657 || (bfd_link_executable (info
) && info
->dynamic
))
6659 struct elf_info_failed eif
;
6663 elf_link_hash_traverse (elf_hash_table (info
),
6664 _bfd_elf_export_symbol
,
6672 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6674 if (soname_indx
== (size_t) -1
6675 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6679 soname_indx
= (size_t) -1;
6681 /* Make all global versions with definition. */
6682 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6683 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6684 if (!d
->symver
&& d
->literal
)
6686 const char *verstr
, *name
;
6687 size_t namelen
, verlen
, newlen
;
6688 char *newname
, *p
, leading_char
;
6689 struct elf_link_hash_entry
*newh
;
6691 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6693 namelen
= strlen (name
) + (leading_char
!= '\0');
6695 verlen
= strlen (verstr
);
6696 newlen
= namelen
+ verlen
+ 3;
6698 newname
= (char *) bfd_malloc (newlen
);
6699 if (newname
== NULL
)
6701 newname
[0] = leading_char
;
6702 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6704 /* Check the hidden versioned definition. */
6705 p
= newname
+ namelen
;
6707 memcpy (p
, verstr
, verlen
+ 1);
6708 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6709 newname
, false, false,
6712 || (newh
->root
.type
!= bfd_link_hash_defined
6713 && newh
->root
.type
!= bfd_link_hash_defweak
))
6715 /* Check the default versioned definition. */
6717 memcpy (p
, verstr
, verlen
+ 1);
6718 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6719 newname
, false, false,
6724 /* Mark this version if there is a definition and it is
6725 not defined in a shared object. */
6727 && !newh
->def_dynamic
6728 && (newh
->root
.type
== bfd_link_hash_defined
6729 || newh
->root
.type
== bfd_link_hash_defweak
))
6733 /* Attach all the symbols to their version information. */
6734 asvinfo
.info
= info
;
6735 asvinfo
.failed
= false;
6737 elf_link_hash_traverse (elf_hash_table (info
),
6738 _bfd_elf_link_assign_sym_version
,
6743 if (!info
->allow_undefined_version
)
6745 /* Check if all global versions have a definition. */
6746 bool all_defined
= true;
6747 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6748 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6749 if (d
->literal
&& !d
->symver
&& !d
->script
)
6752 (_("%s: undefined version: %s"),
6753 d
->pattern
, t
->name
);
6754 all_defined
= false;
6759 bfd_set_error (bfd_error_bad_value
);
6764 /* Set up the version definition section. */
6765 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6766 BFD_ASSERT (s
!= NULL
);
6768 /* We may have created additional version definitions if we are
6769 just linking a regular application. */
6770 verdefs
= info
->version_info
;
6772 /* Skip anonymous version tag. */
6773 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6774 verdefs
= verdefs
->next
;
6776 if (verdefs
== NULL
&& !info
->create_default_symver
)
6777 s
->flags
|= SEC_EXCLUDE
;
6783 Elf_Internal_Verdef def
;
6784 Elf_Internal_Verdaux defaux
;
6785 struct bfd_link_hash_entry
*bh
;
6786 struct elf_link_hash_entry
*h
;
6792 /* Make space for the base version. */
6793 size
+= sizeof (Elf_External_Verdef
);
6794 size
+= sizeof (Elf_External_Verdaux
);
6797 /* Make space for the default version. */
6798 if (info
->create_default_symver
)
6800 size
+= sizeof (Elf_External_Verdef
);
6804 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6806 struct bfd_elf_version_deps
*n
;
6808 /* Don't emit base version twice. */
6812 size
+= sizeof (Elf_External_Verdef
);
6813 size
+= sizeof (Elf_External_Verdaux
);
6816 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6817 size
+= sizeof (Elf_External_Verdaux
);
6821 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6822 if (s
->contents
== NULL
&& s
->size
!= 0)
6825 /* Fill in the version definition section. */
6829 def
.vd_version
= VER_DEF_CURRENT
;
6830 def
.vd_flags
= VER_FLG_BASE
;
6833 if (info
->create_default_symver
)
6835 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6836 def
.vd_next
= sizeof (Elf_External_Verdef
);
6840 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6841 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6842 + sizeof (Elf_External_Verdaux
));
6845 if (soname_indx
!= (size_t) -1)
6847 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6849 def
.vd_hash
= bfd_elf_hash (soname
);
6850 defaux
.vda_name
= soname_indx
;
6857 name
= lbasename (bfd_get_filename (output_bfd
));
6858 def
.vd_hash
= bfd_elf_hash (name
);
6859 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6861 if (indx
== (size_t) -1)
6863 defaux
.vda_name
= indx
;
6865 defaux
.vda_next
= 0;
6867 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6868 (Elf_External_Verdef
*) p
);
6869 p
+= sizeof (Elf_External_Verdef
);
6870 if (info
->create_default_symver
)
6872 /* Add a symbol representing this version. */
6874 if (! (_bfd_generic_link_add_one_symbol
6875 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6877 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6879 h
= (struct elf_link_hash_entry
*) bh
;
6882 h
->type
= STT_OBJECT
;
6883 h
->verinfo
.vertree
= NULL
;
6885 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6888 /* Create a duplicate of the base version with the same
6889 aux block, but different flags. */
6892 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6894 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6895 + sizeof (Elf_External_Verdaux
));
6898 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6899 (Elf_External_Verdef
*) p
);
6900 p
+= sizeof (Elf_External_Verdef
);
6902 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6903 (Elf_External_Verdaux
*) p
);
6904 p
+= sizeof (Elf_External_Verdaux
);
6906 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6909 struct bfd_elf_version_deps
*n
;
6911 /* Don't emit the base version twice. */
6916 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6919 /* Add a symbol representing this version. */
6921 if (! (_bfd_generic_link_add_one_symbol
6922 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6924 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6926 h
= (struct elf_link_hash_entry
*) bh
;
6929 h
->type
= STT_OBJECT
;
6930 h
->verinfo
.vertree
= t
;
6932 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6935 def
.vd_version
= VER_DEF_CURRENT
;
6937 if (t
->globals
.list
== NULL
6938 && t
->locals
.list
== NULL
6940 def
.vd_flags
|= VER_FLG_WEAK
;
6941 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6942 def
.vd_cnt
= cdeps
+ 1;
6943 def
.vd_hash
= bfd_elf_hash (t
->name
);
6944 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6947 /* If a basever node is next, it *must* be the last node in
6948 the chain, otherwise Verdef construction breaks. */
6949 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6950 BFD_ASSERT (t
->next
->next
== NULL
);
6952 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6953 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6954 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6956 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6957 (Elf_External_Verdef
*) p
);
6958 p
+= sizeof (Elf_External_Verdef
);
6960 defaux
.vda_name
= h
->dynstr_index
;
6961 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6963 defaux
.vda_next
= 0;
6964 if (t
->deps
!= NULL
)
6965 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6966 t
->name_indx
= defaux
.vda_name
;
6968 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6969 (Elf_External_Verdaux
*) p
);
6970 p
+= sizeof (Elf_External_Verdaux
);
6972 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6974 if (n
->version_needed
== NULL
)
6976 /* This can happen if there was an error in the
6978 defaux
.vda_name
= 0;
6982 defaux
.vda_name
= n
->version_needed
->name_indx
;
6983 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6986 if (n
->next
== NULL
)
6987 defaux
.vda_next
= 0;
6989 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6991 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6992 (Elf_External_Verdaux
*) p
);
6993 p
+= sizeof (Elf_External_Verdaux
);
6997 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
7001 if (info
->gc_sections
&& bed
->can_gc_sections
)
7003 struct elf_gc_sweep_symbol_info sweep_info
;
7005 /* Remove the symbols that were in the swept sections from the
7006 dynamic symbol table. */
7007 sweep_info
.info
= info
;
7008 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
7009 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
7013 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7016 struct elf_find_verdep_info sinfo
;
7018 /* Work out the size of the version reference section. */
7020 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
7021 BFD_ASSERT (s
!= NULL
);
7024 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
7025 if (sinfo
.vers
== 0)
7027 sinfo
.failed
= false;
7029 elf_link_hash_traverse (elf_hash_table (info
),
7030 _bfd_elf_link_find_version_dependencies
,
7035 if (info
->enable_dt_relr
)
7037 elf_link_add_dt_relr_dependency (&sinfo
);
7042 if (elf_tdata (output_bfd
)->verref
== NULL
)
7043 s
->flags
|= SEC_EXCLUDE
;
7046 Elf_Internal_Verneed
*vn
;
7051 /* Build the version dependency section. */
7054 for (vn
= elf_tdata (output_bfd
)->verref
;
7056 vn
= vn
->vn_nextref
)
7058 Elf_Internal_Vernaux
*a
;
7060 size
+= sizeof (Elf_External_Verneed
);
7062 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
7063 size
+= sizeof (Elf_External_Vernaux
);
7067 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7068 if (s
->contents
== NULL
)
7072 for (vn
= elf_tdata (output_bfd
)->verref
;
7074 vn
= vn
->vn_nextref
)
7077 Elf_Internal_Vernaux
*a
;
7081 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
7084 vn
->vn_version
= VER_NEED_CURRENT
;
7086 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7087 elf_dt_name (vn
->vn_bfd
) != NULL
7088 ? elf_dt_name (vn
->vn_bfd
)
7089 : lbasename (bfd_get_filename
7092 if (indx
== (size_t) -1)
7095 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
7096 if (vn
->vn_nextref
== NULL
)
7099 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
7100 + caux
* sizeof (Elf_External_Vernaux
));
7102 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
7103 (Elf_External_Verneed
*) p
);
7104 p
+= sizeof (Elf_External_Verneed
);
7106 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
7108 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
7109 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7110 a
->vna_nodename
, false);
7111 if (indx
== (size_t) -1)
7114 if (a
->vna_nextptr
== NULL
)
7117 a
->vna_next
= sizeof (Elf_External_Vernaux
);
7119 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
7120 (Elf_External_Vernaux
*) p
);
7121 p
+= sizeof (Elf_External_Vernaux
);
7125 elf_tdata (output_bfd
)->cverrefs
= crefs
;
7129 if (bfd_link_relocatable (info
)
7130 && !_bfd_elf_size_group_sections (info
))
7133 /* Determine any GNU_STACK segment requirements, after the backend
7134 has had a chance to set a default segment size. */
7135 if (info
->execstack
)
7137 /* If the user has explicitly requested warnings, then generate one even
7138 though the choice is the result of another command line option. */
7139 if (info
->warn_execstack
== 1)
7142 warning: enabling an executable stack because of -z execstack command line option"));
7143 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
7145 else if (info
->noexecstack
)
7146 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
7150 asection
*notesec
= NULL
;
7151 bfd
*noteobj
= NULL
;
7152 bfd
*emptyobj
= NULL
;
7155 for (inputobj
= info
->input_bfds
;
7157 inputobj
= inputobj
->link
.next
)
7162 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
7164 s
= inputobj
->sections
;
7165 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
7168 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
7172 if (s
->flags
& SEC_CODE
)
7176 /* There is no point in scanning the remaining bfds. */
7180 else if (bed
->default_execstack
&& info
->default_execstack
)
7183 emptyobj
= inputobj
;
7187 if (notesec
|| info
->stacksize
> 0)
7191 if (info
->warn_execstack
!= 0)
7193 /* PR 29072: Because an executable stack is a serious
7194 security risk, make sure that the user knows that it is
7195 being enabled despite the fact that it was not requested
7196 on the command line. */
7198 _bfd_error_handler (_("\
7199 warning: %s: requires executable stack (because the .note.GNU-stack section is executable)"),
7200 bfd_get_filename (noteobj
));
7203 _bfd_error_handler (_("\
7204 warning: %s: missing .note.GNU-stack section implies executable stack"),
7205 bfd_get_filename (emptyobj
));
7206 _bfd_error_handler (_("\
7207 NOTE: This behaviour is deprecated and will be removed in a future version of the linker"));
7211 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
7214 if (notesec
&& exec
&& bfd_link_relocatable (info
)
7215 && notesec
->output_section
!= bfd_abs_section_ptr
)
7216 notesec
->output_section
->flags
|= SEC_CODE
;
7219 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7221 struct elf_info_failed eif
;
7222 struct elf_link_hash_entry
*h
;
7226 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
7227 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
7231 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
7233 info
->flags
|= DF_SYMBOLIC
;
7241 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
7243 if (indx
== (size_t) -1)
7246 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
7247 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
7251 if (filter_shlib
!= NULL
)
7255 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7256 filter_shlib
, true);
7257 if (indx
== (size_t) -1
7258 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
7262 if (auxiliary_filters
!= NULL
)
7264 const char * const *p
;
7266 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
7270 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7272 if (indx
== (size_t) -1
7273 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7282 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7284 if (indx
== (size_t) -1
7285 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7289 if (depaudit
!= NULL
)
7293 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7295 if (indx
== (size_t) -1
7296 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7303 /* Find all symbols which were defined in a dynamic object and make
7304 the backend pick a reasonable value for them. */
7305 elf_link_hash_traverse (elf_hash_table (info
),
7306 _bfd_elf_adjust_dynamic_symbol
,
7311 /* Add some entries to the .dynamic section. We fill in some of the
7312 values later, in bfd_elf_final_link, but we must add the entries
7313 now so that we know the final size of the .dynamic section. */
7315 /* If there are initialization and/or finalization functions to
7316 call then add the corresponding DT_INIT/DT_FINI entries. */
7317 h
= (info
->init_function
7318 ? elf_link_hash_lookup (elf_hash_table (info
),
7319 info
->init_function
, false,
7326 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7329 h
= (info
->fini_function
7330 ? elf_link_hash_lookup (elf_hash_table (info
),
7331 info
->fini_function
, false,
7338 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7342 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7343 if (s
!= NULL
&& s
->linker_has_input
)
7345 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7346 if (! bfd_link_executable (info
))
7351 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7352 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7353 && (o
= sub
->sections
) != NULL
7354 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7355 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7356 if (elf_section_data (o
)->this_hdr
.sh_type
7357 == SHT_PREINIT_ARRAY
)
7360 (_("%pB: .preinit_array section is not allowed in DSO"),
7365 bfd_set_error (bfd_error_nonrepresentable_section
);
7369 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7370 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7373 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7374 if (s
!= NULL
&& s
->linker_has_input
)
7376 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7377 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7380 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7381 if (s
!= NULL
&& s
->linker_has_input
)
7383 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7384 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7388 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7389 /* If .dynstr is excluded from the link, we don't want any of
7390 these tags. Strictly, we should be checking each section
7391 individually; This quick check covers for the case where
7392 someone does a /DISCARD/ : { *(*) }. */
7393 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7395 bfd_size_type strsize
;
7397 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7398 if ((info
->emit_hash
7399 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7400 || (info
->emit_gnu_hash
7401 && (bed
->record_xhash_symbol
== NULL
7402 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7403 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7404 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7405 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7406 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7408 || (info
->gnu_flags_1
7409 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_FLAGS_1
,
7410 info
->gnu_flags_1
)))
7415 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7418 /* The backend must work out the sizes of all the other dynamic
7421 && bed
->elf_backend_size_dynamic_sections
!= NULL
7422 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7425 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7427 if (elf_tdata (output_bfd
)->cverdefs
)
7429 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7431 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7432 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7436 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7438 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7441 else if (info
->flags
& DF_BIND_NOW
)
7443 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7449 if (bfd_link_executable (info
))
7450 info
->flags_1
&= ~ (DF_1_INITFIRST
7453 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7457 if (elf_tdata (output_bfd
)->cverrefs
)
7459 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7461 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7462 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7466 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7467 && elf_tdata (output_bfd
)->cverdefs
== 0)
7468 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7472 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7473 s
->flags
|= SEC_EXCLUDE
;
7479 /* Find the first non-excluded output section. We'll use its
7480 section symbol for some emitted relocs. */
7482 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7485 asection
*found
= NULL
;
7487 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7488 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7489 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7492 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7495 elf_hash_table (info
)->text_index_section
= found
;
7498 /* Find two non-excluded output sections, one for code, one for data.
7499 We'll use their section symbols for some emitted relocs. */
7501 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7504 asection
*found
= NULL
;
7506 /* Data first, since setting text_index_section changes
7507 _bfd_elf_omit_section_dynsym_default. */
7508 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7509 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7510 && !(s
->flags
& SEC_READONLY
)
7511 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7514 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7517 elf_hash_table (info
)->data_index_section
= found
;
7519 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7520 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7521 && (s
->flags
& SEC_READONLY
)
7522 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7527 elf_hash_table (info
)->text_index_section
= found
;
7530 #define GNU_HASH_SECTION_NAME(bed) \
7531 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7534 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7536 const struct elf_backend_data
*bed
;
7537 unsigned long section_sym_count
;
7538 bfd_size_type dynsymcount
= 0;
7540 if (!is_elf_hash_table (info
->hash
))
7543 bed
= get_elf_backend_data (output_bfd
);
7544 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7546 /* Assign dynsym indices. In a shared library we generate a section
7547 symbol for each output section, which come first. Next come all
7548 of the back-end allocated local dynamic syms, followed by the rest
7549 of the global symbols.
7551 This is usually not needed for static binaries, however backends
7552 can request to always do it, e.g. the MIPS backend uses dynamic
7553 symbol counts to lay out GOT, which will be produced in the
7554 presence of GOT relocations even in static binaries (holding fixed
7555 data in that case, to satisfy those relocations). */
7557 if (elf_hash_table (info
)->dynamic_sections_created
7558 || bed
->always_renumber_dynsyms
)
7559 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7560 §ion_sym_count
);
7562 if (elf_hash_table (info
)->dynamic_sections_created
)
7566 unsigned int dtagcount
;
7568 dynobj
= elf_hash_table (info
)->dynobj
;
7570 /* Work out the size of the symbol version section. */
7571 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7572 BFD_ASSERT (s
!= NULL
);
7573 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7575 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7576 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7577 if (s
->contents
== NULL
)
7580 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7584 /* Set the size of the .dynsym and .hash sections. We counted
7585 the number of dynamic symbols in elf_link_add_object_symbols.
7586 We will build the contents of .dynsym and .hash when we build
7587 the final symbol table, because until then we do not know the
7588 correct value to give the symbols. We built the .dynstr
7589 section as we went along in elf_link_add_object_symbols. */
7590 s
= elf_hash_table (info
)->dynsym
;
7591 BFD_ASSERT (s
!= NULL
);
7592 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7594 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7595 if (s
->contents
== NULL
)
7598 /* The first entry in .dynsym is a dummy symbol. Clear all the
7599 section syms, in case we don't output them all. */
7600 ++section_sym_count
;
7601 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7603 elf_hash_table (info
)->bucketcount
= 0;
7605 /* Compute the size of the hashing table. As a side effect this
7606 computes the hash values for all the names we export. */
7607 if (info
->emit_hash
)
7609 unsigned long int *hashcodes
;
7610 struct hash_codes_info hashinf
;
7612 unsigned long int nsyms
;
7614 size_t hash_entry_size
;
7616 /* Compute the hash values for all exported symbols. At the same
7617 time store the values in an array so that we could use them for
7619 amt
= dynsymcount
* sizeof (unsigned long int);
7620 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7621 if (hashcodes
== NULL
)
7623 hashinf
.hashcodes
= hashcodes
;
7624 hashinf
.error
= false;
7626 /* Put all hash values in HASHCODES. */
7627 elf_link_hash_traverse (elf_hash_table (info
),
7628 elf_collect_hash_codes
, &hashinf
);
7635 nsyms
= hashinf
.hashcodes
- hashcodes
;
7637 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7640 if (bucketcount
== 0 && nsyms
> 0)
7643 elf_hash_table (info
)->bucketcount
= bucketcount
;
7645 s
= bfd_get_linker_section (dynobj
, ".hash");
7646 BFD_ASSERT (s
!= NULL
);
7647 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7648 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7649 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7650 if (s
->contents
== NULL
)
7653 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7654 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7655 s
->contents
+ hash_entry_size
);
7658 if (info
->emit_gnu_hash
)
7661 unsigned char *contents
;
7662 struct collect_gnu_hash_codes cinfo
;
7666 memset (&cinfo
, 0, sizeof (cinfo
));
7668 /* Compute the hash values for all exported symbols. At the same
7669 time store the values in an array so that we could use them for
7671 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7672 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7673 if (cinfo
.hashcodes
== NULL
)
7676 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7677 cinfo
.min_dynindx
= -1;
7678 cinfo
.output_bfd
= output_bfd
;
7681 /* Put all hash values in HASHCODES. */
7682 elf_link_hash_traverse (elf_hash_table (info
),
7683 elf_collect_gnu_hash_codes
, &cinfo
);
7686 free (cinfo
.hashcodes
);
7691 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7693 if (bucketcount
== 0)
7695 free (cinfo
.hashcodes
);
7699 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7700 BFD_ASSERT (s
!= NULL
);
7702 if (cinfo
.nsyms
== 0)
7704 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7705 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7706 free (cinfo
.hashcodes
);
7707 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7708 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7709 if (contents
== NULL
)
7711 s
->contents
= contents
;
7712 /* 1 empty bucket. */
7713 bfd_put_32 (output_bfd
, 1, contents
);
7714 /* SYMIDX above the special symbol 0. */
7715 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7716 /* Just one word for bitmask. */
7717 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7718 /* Only hash fn bloom filter. */
7719 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7720 /* No hashes are valid - empty bitmask. */
7721 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7722 /* No hashes in the only bucket. */
7723 bfd_put_32 (output_bfd
, 0,
7724 contents
+ 16 + bed
->s
->arch_size
/ 8);
7728 unsigned long int maskwords
, maskbitslog2
, x
;
7729 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7733 while ((x
>>= 1) != 0)
7735 if (maskbitslog2
< 3)
7737 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7738 maskbitslog2
= maskbitslog2
+ 3;
7740 maskbitslog2
= maskbitslog2
+ 2;
7741 if (bed
->s
->arch_size
== 64)
7743 if (maskbitslog2
== 5)
7749 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7750 cinfo
.shift2
= maskbitslog2
;
7751 cinfo
.maskbits
= 1 << maskbitslog2
;
7752 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7753 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7754 amt
+= maskwords
* sizeof (bfd_vma
);
7755 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7756 if (cinfo
.bitmask
== NULL
)
7758 free (cinfo
.hashcodes
);
7762 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7763 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7764 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7765 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7767 /* Determine how often each hash bucket is used. */
7768 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7769 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7770 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7772 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7773 if (cinfo
.counts
[i
] != 0)
7775 cinfo
.indx
[i
] = cnt
;
7776 cnt
+= cinfo
.counts
[i
];
7778 BFD_ASSERT (cnt
== dynsymcount
);
7779 cinfo
.bucketcount
= bucketcount
;
7780 cinfo
.local_indx
= cinfo
.min_dynindx
;
7782 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7783 s
->size
+= cinfo
.maskbits
/ 8;
7784 if (bed
->record_xhash_symbol
!= NULL
)
7785 s
->size
+= cinfo
.nsyms
* 4;
7786 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7787 if (contents
== NULL
)
7789 free (cinfo
.bitmask
);
7790 free (cinfo
.hashcodes
);
7794 s
->contents
= contents
;
7795 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7796 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7797 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7798 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7799 contents
+= 16 + cinfo
.maskbits
/ 8;
7801 for (i
= 0; i
< bucketcount
; ++i
)
7803 if (cinfo
.counts
[i
] == 0)
7804 bfd_put_32 (output_bfd
, 0, contents
);
7806 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7810 cinfo
.contents
= contents
;
7812 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7813 /* Renumber dynamic symbols, if populating .gnu.hash section.
7814 If using .MIPS.xhash, populate the translation table. */
7815 elf_link_hash_traverse (elf_hash_table (info
),
7816 elf_gnu_hash_process_symidx
, &cinfo
);
7818 contents
= s
->contents
+ 16;
7819 for (i
= 0; i
< maskwords
; ++i
)
7821 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7823 contents
+= bed
->s
->arch_size
/ 8;
7826 free (cinfo
.bitmask
);
7827 free (cinfo
.hashcodes
);
7831 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7832 BFD_ASSERT (s
!= NULL
);
7834 elf_finalize_dynstr (output_bfd
, info
);
7836 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7838 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7839 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7846 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7849 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7852 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7853 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7856 /* Finish SHF_MERGE section merging. */
7859 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7864 if (!is_elf_hash_table (info
->hash
))
7867 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7868 if ((ibfd
->flags
& DYNAMIC
) == 0
7869 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7870 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7871 == get_elf_backend_data (obfd
)->s
->elfclass
))
7872 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7873 if ((sec
->flags
& SEC_MERGE
) != 0
7874 && !bfd_is_abs_section (sec
->output_section
))
7876 struct bfd_elf_section_data
*secdata
;
7878 secdata
= elf_section_data (sec
);
7879 if (! _bfd_add_merge_section (obfd
,
7880 &elf_hash_table (info
)->merge_info
,
7881 sec
, &secdata
->sec_info
))
7883 else if (secdata
->sec_info
)
7884 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7887 if (elf_hash_table (info
)->merge_info
!= NULL
)
7888 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7889 merge_sections_remove_hook
);
7893 /* Create an entry in an ELF linker hash table. */
7895 struct bfd_hash_entry
*
7896 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7897 struct bfd_hash_table
*table
,
7900 /* Allocate the structure if it has not already been allocated by a
7904 entry
= (struct bfd_hash_entry
*)
7905 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7910 /* Call the allocation method of the superclass. */
7911 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7914 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7915 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7917 /* Set local fields. */
7920 ret
->got
= htab
->init_got_refcount
;
7921 ret
->plt
= htab
->init_plt_refcount
;
7922 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7923 - offsetof (struct elf_link_hash_entry
, size
)));
7924 /* Assume that we have been called by a non-ELF symbol reader.
7925 This flag is then reset by the code which reads an ELF input
7926 file. This ensures that a symbol created by a non-ELF symbol
7927 reader will have the flag set correctly. */
7934 /* Copy data from an indirect symbol to its direct symbol, hiding the
7935 old indirect symbol. Also used for copying flags to a weakdef. */
7938 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7939 struct elf_link_hash_entry
*dir
,
7940 struct elf_link_hash_entry
*ind
)
7942 struct elf_link_hash_table
*htab
;
7944 if (ind
->dyn_relocs
!= NULL
)
7946 if (dir
->dyn_relocs
!= NULL
)
7948 struct elf_dyn_relocs
**pp
;
7949 struct elf_dyn_relocs
*p
;
7951 /* Add reloc counts against the indirect sym to the direct sym
7952 list. Merge any entries against the same section. */
7953 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7955 struct elf_dyn_relocs
*q
;
7957 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7958 if (q
->sec
== p
->sec
)
7960 q
->pc_count
+= p
->pc_count
;
7961 q
->count
+= p
->count
;
7968 *pp
= dir
->dyn_relocs
;
7971 dir
->dyn_relocs
= ind
->dyn_relocs
;
7972 ind
->dyn_relocs
= NULL
;
7975 /* Copy down any references that we may have already seen to the
7976 symbol which just became indirect. */
7978 if (dir
->versioned
!= versioned_hidden
)
7979 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7980 dir
->ref_regular
|= ind
->ref_regular
;
7981 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7982 dir
->non_got_ref
|= ind
->non_got_ref
;
7983 dir
->needs_plt
|= ind
->needs_plt
;
7984 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7986 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7989 /* Copy over the global and procedure linkage table refcount entries.
7990 These may have been already set up by a check_relocs routine. */
7991 htab
= elf_hash_table (info
);
7992 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7994 if (dir
->got
.refcount
< 0)
7995 dir
->got
.refcount
= 0;
7996 dir
->got
.refcount
+= ind
->got
.refcount
;
7997 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
8000 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
8002 if (dir
->plt
.refcount
< 0)
8003 dir
->plt
.refcount
= 0;
8004 dir
->plt
.refcount
+= ind
->plt
.refcount
;
8005 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
8008 if (ind
->dynindx
!= -1)
8010 if (dir
->dynindx
!= -1)
8011 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
8012 dir
->dynindx
= ind
->dynindx
;
8013 dir
->dynstr_index
= ind
->dynstr_index
;
8015 ind
->dynstr_index
= 0;
8020 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
8021 struct elf_link_hash_entry
*h
,
8024 /* STT_GNU_IFUNC symbol must go through PLT. */
8025 if (h
->type
!= STT_GNU_IFUNC
)
8027 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
8032 h
->forced_local
= 1;
8033 if (h
->dynindx
!= -1)
8035 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
8038 h
->dynstr_index
= 0;
8043 /* Hide a symbol. */
8046 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
8047 struct bfd_link_info
*info
,
8048 struct bfd_link_hash_entry
*h
)
8050 if (is_elf_hash_table (info
->hash
))
8052 const struct elf_backend_data
*bed
8053 = get_elf_backend_data (output_bfd
);
8054 struct elf_link_hash_entry
*eh
8055 = (struct elf_link_hash_entry
*) h
;
8056 bed
->elf_backend_hide_symbol (info
, eh
, true);
8057 eh
->def_dynamic
= 0;
8058 eh
->ref_dynamic
= 0;
8059 eh
->dynamic_def
= 0;
8063 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
8067 _bfd_elf_link_hash_table_init
8068 (struct elf_link_hash_table
*table
,
8070 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
8071 struct bfd_hash_table
*,
8073 unsigned int entsize
,
8074 enum elf_target_id target_id
)
8077 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
8079 table
->init_got_refcount
.refcount
= can_refcount
- 1;
8080 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
8081 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
8082 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
8083 /* The first dynamic symbol is a dummy. */
8084 table
->dynsymcount
= 1;
8086 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
8088 table
->root
.type
= bfd_link_elf_hash_table
;
8089 table
->hash_table_id
= target_id
;
8090 table
->target_os
= get_elf_backend_data (abfd
)->target_os
;
8095 /* Create an ELF linker hash table. */
8097 struct bfd_link_hash_table
*
8098 _bfd_elf_link_hash_table_create (bfd
*abfd
)
8100 struct elf_link_hash_table
*ret
;
8101 size_t amt
= sizeof (struct elf_link_hash_table
);
8103 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
8107 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
8108 sizeof (struct elf_link_hash_entry
),
8114 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
8119 /* Destroy an ELF linker hash table. */
8122 _bfd_elf_link_hash_table_free (bfd
*obfd
)
8124 struct elf_link_hash_table
*htab
;
8126 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
8127 if (htab
->dynstr
!= NULL
)
8128 _bfd_elf_strtab_free (htab
->dynstr
);
8129 _bfd_merge_sections_free (htab
->merge_info
);
8130 _bfd_generic_link_hash_table_free (obfd
);
8133 /* This is a hook for the ELF emulation code in the generic linker to
8134 tell the backend linker what file name to use for the DT_NEEDED
8135 entry for a dynamic object. */
8138 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
8140 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
8141 && bfd_get_format (abfd
) == bfd_object
)
8142 elf_dt_name (abfd
) = name
;
8146 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
8149 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
8150 && bfd_get_format (abfd
) == bfd_object
)
8151 lib_class
= elf_dyn_lib_class (abfd
);
8158 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
8160 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
8161 && bfd_get_format (abfd
) == bfd_object
)
8162 elf_dyn_lib_class (abfd
) = lib_class
;
8165 /* Get the list of DT_NEEDED entries for a link. This is a hook for
8166 the linker ELF emulation code. */
8168 struct bfd_link_needed_list
*
8169 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
8170 struct bfd_link_info
*info
)
8172 if (! is_elf_hash_table (info
->hash
))
8174 return elf_hash_table (info
)->needed
;
8177 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
8178 hook for the linker ELF emulation code. */
8180 struct bfd_link_needed_list
*
8181 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
8182 struct bfd_link_info
*info
)
8184 if (! is_elf_hash_table (info
->hash
))
8186 return elf_hash_table (info
)->runpath
;
8189 /* Get the name actually used for a dynamic object for a link. This
8190 is the SONAME entry if there is one. Otherwise, it is the string
8191 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
8194 bfd_elf_get_dt_soname (bfd
*abfd
)
8196 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
8197 && bfd_get_format (abfd
) == bfd_object
)
8198 return elf_dt_name (abfd
);
8202 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
8203 the ELF linker emulation code. */
8206 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
8207 struct bfd_link_needed_list
**pneeded
)
8210 bfd_byte
*dynbuf
= NULL
;
8211 unsigned int elfsec
;
8212 unsigned long shlink
;
8213 bfd_byte
*extdyn
, *extdynend
;
8215 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
8219 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
8220 || bfd_get_format (abfd
) != bfd_object
)
8223 s
= bfd_get_section_by_name (abfd
, ".dynamic");
8224 if (s
== NULL
|| s
->size
== 0 || (s
->flags
& SEC_HAS_CONTENTS
) == 0)
8227 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
8230 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
8231 if (elfsec
== SHN_BAD
)
8234 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
8236 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
8237 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
8239 for (extdyn
= dynbuf
, extdynend
= dynbuf
+ s
->size
;
8240 (size_t) (extdynend
- extdyn
) >= extdynsize
;
8241 extdyn
+= extdynsize
)
8243 Elf_Internal_Dyn dyn
;
8245 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
8247 if (dyn
.d_tag
== DT_NULL
)
8250 if (dyn
.d_tag
== DT_NEEDED
)
8253 struct bfd_link_needed_list
*l
;
8254 unsigned int tagv
= dyn
.d_un
.d_val
;
8257 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
8262 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
8282 struct elf_symbuf_symbol
8284 unsigned long st_name
; /* Symbol name, index in string tbl */
8285 unsigned char st_info
; /* Type and binding attributes */
8286 unsigned char st_other
; /* Visibilty, and target specific */
8289 struct elf_symbuf_head
8291 struct elf_symbuf_symbol
*ssym
;
8293 unsigned int st_shndx
;
8300 Elf_Internal_Sym
*isym
;
8301 struct elf_symbuf_symbol
*ssym
;
8307 /* Sort references to symbols by ascending section number. */
8310 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8312 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8313 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8315 if (s1
->st_shndx
!= s2
->st_shndx
)
8316 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8317 /* Final sort by the address of the sym in the symbuf ensures
8320 return s1
> s2
? 1 : -1;
8325 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8327 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8328 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8329 int ret
= strcmp (s1
->name
, s2
->name
);
8332 if (s1
->u
.p
!= s2
->u
.p
)
8333 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8337 static struct elf_symbuf_head
*
8338 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8340 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8341 struct elf_symbuf_symbol
*ssym
;
8342 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8343 size_t i
, shndx_count
, total_size
, amt
;
8345 amt
= symcount
* sizeof (*indbuf
);
8346 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8350 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8351 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
8352 *ind
++ = &isymbuf
[i
];
8355 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8356 elf_sort_elf_symbol
);
8359 if (indbufend
> indbuf
)
8360 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8361 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8364 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8365 + (indbufend
- indbuf
) * sizeof (*ssym
));
8366 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8367 if (ssymbuf
== NULL
)
8373 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8374 ssymbuf
->ssym
= NULL
;
8375 ssymbuf
->count
= shndx_count
;
8376 ssymbuf
->st_shndx
= 0;
8377 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8379 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8382 ssymhead
->ssym
= ssym
;
8383 ssymhead
->count
= 0;
8384 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8386 ssym
->st_name
= (*ind
)->st_name
;
8387 ssym
->st_info
= (*ind
)->st_info
;
8388 ssym
->st_other
= (*ind
)->st_other
;
8391 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8392 && (uintptr_t) ssym
- (uintptr_t) ssymbuf
== total_size
);
8398 /* Check if 2 sections define the same set of local and global
8402 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8403 struct bfd_link_info
*info
)
8406 const struct elf_backend_data
*bed1
, *bed2
;
8407 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8408 size_t symcount1
, symcount2
;
8409 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8410 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8411 Elf_Internal_Sym
*isym
, *isymend
;
8412 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8413 size_t count1
, count2
, sec_count1
, sec_count2
, i
;
8414 unsigned int shndx1
, shndx2
;
8416 bool ignore_section_symbol_p
;
8421 /* Both sections have to be in ELF. */
8422 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8423 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8426 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8429 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8430 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8431 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8434 bed1
= get_elf_backend_data (bfd1
);
8435 bed2
= get_elf_backend_data (bfd2
);
8436 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8437 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8438 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8439 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8441 if (symcount1
== 0 || symcount2
== 0)
8447 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8448 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8450 /* Ignore section symbols only when matching non-debugging sections
8451 or linkonce section with comdat section. */
8452 ignore_section_symbol_p
8453 = ((sec1
->flags
& SEC_DEBUGGING
) == 0
8454 || ((elf_section_flags (sec1
) & SHF_GROUP
)
8455 != (elf_section_flags (sec2
) & SHF_GROUP
)));
8457 if (ssymbuf1
== NULL
)
8459 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8461 if (isymbuf1
== NULL
)
8464 if (info
!= NULL
&& !info
->reduce_memory_overheads
)
8466 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8467 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8471 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8473 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8475 if (isymbuf2
== NULL
)
8478 if (ssymbuf1
!= NULL
&& info
!= NULL
&& !info
->reduce_memory_overheads
)
8480 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8481 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8485 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8487 /* Optimized faster version. */
8489 struct elf_symbol
*symp
;
8490 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8493 hi
= ssymbuf1
->count
;
8499 mid
= (lo
+ hi
) / 2;
8500 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8502 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8506 count1
= ssymbuf1
[mid
].count
;
8511 if (ignore_section_symbol_p
)
8513 for (i
= 0; i
< count1
; i
++)
8514 if (ELF_ST_TYPE (ssymbuf1
->ssym
[i
].st_info
) == STT_SECTION
)
8516 count1
-= sec_count1
;
8520 hi
= ssymbuf2
->count
;
8526 mid
= (lo
+ hi
) / 2;
8527 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8529 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8533 count2
= ssymbuf2
[mid
].count
;
8538 if (ignore_section_symbol_p
)
8540 for (i
= 0; i
< count2
; i
++)
8541 if (ELF_ST_TYPE (ssymbuf2
->ssym
[i
].st_info
) == STT_SECTION
)
8543 count2
-= sec_count2
;
8546 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8550 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8552 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8553 if (symtable1
== NULL
|| symtable2
== NULL
)
8557 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
+ sec_count1
;
8558 ssym
< ssymend
; ssym
++)
8560 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8562 symp
->u
.ssym
= ssym
;
8563 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8570 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
+ sec_count2
;
8571 ssym
< ssymend
; ssym
++)
8573 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8575 symp
->u
.ssym
= ssym
;
8576 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8582 /* Sort symbol by name. */
8583 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8584 elf_sym_name_compare
);
8585 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8586 elf_sym_name_compare
);
8588 for (i
= 0; i
< count1
; i
++)
8589 /* Two symbols must have the same binding, type and name. */
8590 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8591 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8592 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8599 symtable1
= (struct elf_symbol
*)
8600 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8601 symtable2
= (struct elf_symbol
*)
8602 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8603 if (symtable1
== NULL
|| symtable2
== NULL
)
8606 /* Count definitions in the section. */
8608 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8609 if (isym
->st_shndx
== shndx1
8610 && (!ignore_section_symbol_p
8611 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8612 symtable1
[count1
++].u
.isym
= isym
;
8615 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8616 if (isym
->st_shndx
== shndx2
8617 && (!ignore_section_symbol_p
8618 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8619 symtable2
[count2
++].u
.isym
= isym
;
8621 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8624 for (i
= 0; i
< count1
; i
++)
8626 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8627 symtable1
[i
].u
.isym
->st_name
);
8629 for (i
= 0; i
< count2
; i
++)
8631 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8632 symtable2
[i
].u
.isym
->st_name
);
8634 /* Sort symbol by name. */
8635 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8636 elf_sym_name_compare
);
8637 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8638 elf_sym_name_compare
);
8640 for (i
= 0; i
< count1
; i
++)
8641 /* Two symbols must have the same binding, type and name. */
8642 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8643 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8644 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8658 /* Return TRUE if 2 section types are compatible. */
8661 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8662 bfd
*bbfd
, const asection
*bsec
)
8666 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8667 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8670 return elf_section_type (asec
) == elf_section_type (bsec
);
8673 /* Final phase of ELF linker. */
8675 /* A structure we use to avoid passing large numbers of arguments. */
8677 struct elf_final_link_info
8679 /* General link information. */
8680 struct bfd_link_info
*info
;
8683 /* Symbol string table. */
8684 struct elf_strtab_hash
*symstrtab
;
8685 /* .hash section. */
8687 /* symbol version section (.gnu.version). */
8688 asection
*symver_sec
;
8689 /* Buffer large enough to hold contents of any section. */
8691 /* Buffer large enough to hold external relocs of any section. */
8692 void *external_relocs
;
8693 /* Buffer large enough to hold internal relocs of any section. */
8694 Elf_Internal_Rela
*internal_relocs
;
8695 /* Buffer large enough to hold external local symbols of any input
8697 bfd_byte
*external_syms
;
8698 /* And a buffer for symbol section indices. */
8699 Elf_External_Sym_Shndx
*locsym_shndx
;
8700 /* Buffer large enough to hold internal local symbols of any input
8702 Elf_Internal_Sym
*internal_syms
;
8703 /* Array large enough to hold a symbol index for each local symbol
8704 of any input BFD. */
8706 /* Array large enough to hold a section pointer for each local
8707 symbol of any input BFD. */
8708 asection
**sections
;
8709 /* Buffer for SHT_SYMTAB_SHNDX section. */
8710 Elf_External_Sym_Shndx
*symshndxbuf
;
8711 /* Number of STT_FILE syms seen. */
8712 size_t filesym_count
;
8713 /* Local symbol hash table. */
8714 struct bfd_hash_table local_hash_table
;
8717 struct local_hash_entry
8719 /* Base hash table entry structure. */
8720 struct bfd_hash_entry root
;
8721 /* Size of the local symbol name. */
8723 /* Number of the duplicated local symbol names. */
8727 /* Create an entry in the local symbol hash table. */
8729 static struct bfd_hash_entry
*
8730 local_hash_newfunc (struct bfd_hash_entry
*entry
,
8731 struct bfd_hash_table
*table
,
8735 /* Allocate the structure if it has not already been allocated by a
8739 entry
= bfd_hash_allocate (table
,
8740 sizeof (struct local_hash_entry
));
8745 /* Call the allocation method of the superclass. */
8746 entry
= bfd_hash_newfunc (entry
, table
, string
);
8749 ((struct local_hash_entry
*) entry
)->count
= 0;
8750 ((struct local_hash_entry
*) entry
)->size
= 0;
8756 /* This struct is used to pass information to elf_link_output_extsym. */
8758 struct elf_outext_info
8763 struct elf_final_link_info
*flinfo
;
8767 /* Support for evaluating a complex relocation.
8769 Complex relocations are generalized, self-describing relocations. The
8770 implementation of them consists of two parts: complex symbols, and the
8771 relocations themselves.
8773 The relocations use a reserved elf-wide relocation type code (R_RELC
8774 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8775 information (start bit, end bit, word width, etc) into the addend. This
8776 information is extracted from CGEN-generated operand tables within gas.
8778 Complex symbols are mangled symbols (STT_RELC external / BSF_RELC
8779 internal) representing prefix-notation expressions, including but not
8780 limited to those sorts of expressions normally encoded as addends in the
8781 addend field. The symbol mangling format is:
8784 | <unary-operator> ':' <node>
8785 | <binary-operator> ':' <node> ':' <node>
8788 <literal> := 's' <digits=N> ':' <N character symbol name>
8789 | 'S' <digits=N> ':' <N character section name>
8793 <binary-operator> := as in C
8794 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8797 set_symbol_value (bfd
*bfd_with_globals
,
8798 Elf_Internal_Sym
*isymbuf
,
8803 struct elf_link_hash_entry
**sym_hashes
;
8804 struct elf_link_hash_entry
*h
;
8805 size_t extsymoff
= locsymcount
;
8807 if (symidx
< locsymcount
)
8809 Elf_Internal_Sym
*sym
;
8811 sym
= isymbuf
+ symidx
;
8812 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8814 /* It is a local symbol: move it to the
8815 "absolute" section and give it a value. */
8816 sym
->st_shndx
= SHN_ABS
;
8817 sym
->st_value
= val
;
8820 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8824 /* It is a global symbol: set its link type
8825 to "defined" and give it a value. */
8827 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8828 h
= sym_hashes
[symidx
- extsymoff
];
8829 while (h
->root
.type
== bfd_link_hash_indirect
8830 || h
->root
.type
== bfd_link_hash_warning
)
8831 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8832 h
->root
.type
= bfd_link_hash_defined
;
8833 h
->root
.u
.def
.value
= val
;
8834 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8838 resolve_symbol (const char *name
,
8840 struct elf_final_link_info
*flinfo
,
8842 Elf_Internal_Sym
*isymbuf
,
8845 Elf_Internal_Sym
*sym
;
8846 struct bfd_link_hash_entry
*global_entry
;
8847 const char *candidate
= NULL
;
8848 Elf_Internal_Shdr
*symtab_hdr
;
8851 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8853 for (i
= 0; i
< locsymcount
; ++ i
)
8857 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8860 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8861 symtab_hdr
->sh_link
,
8864 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8865 name
, candidate
, (unsigned long) sym
->st_value
);
8867 if (candidate
&& strcmp (candidate
, name
) == 0)
8869 asection
*sec
= flinfo
->sections
[i
];
8871 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8872 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8874 printf ("Found symbol with value %8.8lx\n",
8875 (unsigned long) *result
);
8881 /* Hmm, haven't found it yet. perhaps it is a global. */
8882 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8883 false, false, true);
8887 if (global_entry
->type
== bfd_link_hash_defined
8888 || global_entry
->type
== bfd_link_hash_defweak
)
8890 *result
= (global_entry
->u
.def
.value
8891 + global_entry
->u
.def
.section
->output_section
->vma
8892 + global_entry
->u
.def
.section
->output_offset
);
8894 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8895 global_entry
->root
.string
, (unsigned long) *result
);
8903 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8904 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8905 names like "foo.end" which is the end address of section "foo". */
8908 resolve_section (const char *name
,
8916 for (curr
= sections
; curr
; curr
= curr
->next
)
8917 if (strcmp (curr
->name
, name
) == 0)
8919 *result
= curr
->vma
;
8923 /* Hmm. still haven't found it. try pseudo-section names. */
8924 /* FIXME: This could be coded more efficiently... */
8925 for (curr
= sections
; curr
; curr
= curr
->next
)
8927 len
= strlen (curr
->name
);
8928 if (len
> strlen (name
))
8931 if (strncmp (curr
->name
, name
, len
) == 0)
8933 if (startswith (name
+ len
, ".end"))
8935 *result
= (curr
->vma
8936 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8940 /* Insert more pseudo-section names here, if you like. */
8948 undefined_reference (const char *reftype
, const char *name
)
8950 /* xgettext:c-format */
8951 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8953 bfd_set_error (bfd_error_bad_value
);
8957 eval_symbol (bfd_vma
*result
,
8960 struct elf_final_link_info
*flinfo
,
8962 Elf_Internal_Sym
*isymbuf
,
8971 const char *sym
= *symp
;
8973 bool symbol_is_section
= false;
8978 if (len
< 1 || len
> sizeof (symbuf
))
8980 bfd_set_error (bfd_error_invalid_operation
);
8993 *result
= strtoul (sym
, (char **) symp
, 16);
8997 symbol_is_section
= true;
9001 symlen
= strtol (sym
, (char **) symp
, 10);
9002 sym
= *symp
+ 1; /* Skip the trailing ':'. */
9004 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
9006 bfd_set_error (bfd_error_invalid_operation
);
9010 memcpy (symbuf
, sym
, symlen
);
9011 symbuf
[symlen
] = '\0';
9012 *symp
= sym
+ symlen
;
9014 /* Is it always possible, with complex symbols, that gas "mis-guessed"
9015 the symbol as a section, or vice-versa. so we're pretty liberal in our
9016 interpretation here; section means "try section first", not "must be a
9017 section", and likewise with symbol. */
9019 if (symbol_is_section
)
9021 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
9022 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
9023 isymbuf
, locsymcount
))
9025 undefined_reference ("section", symbuf
);
9031 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
9032 isymbuf
, locsymcount
)
9033 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
9036 undefined_reference ("symbol", symbuf
);
9043 /* All that remains are operators. */
9045 #define UNARY_OP(op) \
9046 if (startswith (sym, #op)) \
9048 sym += strlen (#op); \
9052 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
9053 isymbuf, locsymcount, signed_p)) \
9056 *result = op ((bfd_signed_vma) a); \
9062 #define BINARY_OP_HEAD(op) \
9063 if (startswith (sym, #op)) \
9065 sym += strlen (#op); \
9069 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
9070 isymbuf, locsymcount, signed_p)) \
9073 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
9074 isymbuf, locsymcount, signed_p)) \
9076 #define BINARY_OP_TAIL(op) \
9078 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
9083 #define BINARY_OP(op) BINARY_OP_HEAD(op) BINARY_OP_TAIL(op)
9087 BINARY_OP_HEAD (<<);
9088 if (b
>= sizeof (a
) * CHAR_BIT
)
9094 BINARY_OP_TAIL (<<);
9095 BINARY_OP_HEAD (>>);
9096 if (b
>= sizeof (a
) * CHAR_BIT
)
9098 *result
= signed_p
&& (bfd_signed_vma
) a
< 0 ? -1 : 0;
9101 BINARY_OP_TAIL (>>);
9114 _bfd_error_handler (_("division by zero"));
9115 bfd_set_error (bfd_error_bad_value
);
9122 _bfd_error_handler (_("division by zero"));
9123 bfd_set_error (bfd_error_bad_value
);
9136 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
9137 bfd_set_error (bfd_error_invalid_operation
);
9143 put_value (bfd_vma size
,
9144 unsigned long chunksz
,
9149 location
+= (size
- chunksz
);
9151 for (; size
; size
-= chunksz
, location
-= chunksz
)
9156 bfd_put_8 (input_bfd
, x
, location
);
9160 bfd_put_16 (input_bfd
, x
, location
);
9164 bfd_put_32 (input_bfd
, x
, location
);
9165 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
9171 bfd_put_64 (input_bfd
, x
, location
);
9172 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
9185 get_value (bfd_vma size
,
9186 unsigned long chunksz
,
9193 /* Sanity checks. */
9194 BFD_ASSERT (chunksz
<= sizeof (x
)
9197 && (size
% chunksz
) == 0
9198 && input_bfd
!= NULL
9199 && location
!= NULL
);
9201 if (chunksz
== sizeof (x
))
9203 BFD_ASSERT (size
== chunksz
);
9205 /* Make sure that we do not perform an undefined shift operation.
9206 We know that size == chunksz so there will only be one iteration
9207 of the loop below. */
9211 shift
= 8 * chunksz
;
9213 for (; size
; size
-= chunksz
, location
+= chunksz
)
9218 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
9221 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
9224 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
9228 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
9239 decode_complex_addend (unsigned long *start
, /* in bits */
9240 unsigned long *oplen
, /* in bits */
9241 unsigned long *len
, /* in bits */
9242 unsigned long *wordsz
, /* in bytes */
9243 unsigned long *chunksz
, /* in bytes */
9244 unsigned long *lsb0_p
,
9245 unsigned long *signed_p
,
9246 unsigned long *trunc_p
,
9247 unsigned long encoded
)
9249 * start
= encoded
& 0x3F;
9250 * len
= (encoded
>> 6) & 0x3F;
9251 * oplen
= (encoded
>> 12) & 0x3F;
9252 * wordsz
= (encoded
>> 18) & 0xF;
9253 * chunksz
= (encoded
>> 22) & 0xF;
9254 * lsb0_p
= (encoded
>> 27) & 1;
9255 * signed_p
= (encoded
>> 28) & 1;
9256 * trunc_p
= (encoded
>> 29) & 1;
9259 bfd_reloc_status_type
9260 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
9261 asection
*input_section
,
9263 Elf_Internal_Rela
*rel
,
9266 bfd_vma shift
, x
, mask
;
9267 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
9268 bfd_reloc_status_type r
;
9269 bfd_size_type octets
;
9271 /* Perform this reloc, since it is complex.
9272 (this is not to say that it necessarily refers to a complex
9273 symbol; merely that it is a self-describing CGEN based reloc.
9274 i.e. the addend has the complete reloc information (bit start, end,
9275 word size, etc) encoded within it.). */
9277 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
9278 &chunksz
, &lsb0_p
, &signed_p
,
9279 &trunc_p
, rel
->r_addend
);
9281 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
9284 shift
= (start
+ 1) - len
;
9286 shift
= (8 * wordsz
) - (start
+ len
);
9288 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
9289 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
9292 printf ("Doing complex reloc: "
9293 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
9294 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
9295 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
9296 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
9297 oplen
, (unsigned long) x
, (unsigned long) mask
,
9298 (unsigned long) relocation
);
9303 /* Now do an overflow check. */
9304 r
= bfd_check_overflow ((signed_p
9305 ? complain_overflow_signed
9306 : complain_overflow_unsigned
),
9307 len
, 0, (8 * wordsz
),
9311 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
9314 printf (" relocation: %8.8lx\n"
9315 " shifted mask: %8.8lx\n"
9316 " shifted/masked reloc: %8.8lx\n"
9317 " result: %8.8lx\n",
9318 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
9319 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
9321 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
9325 /* Functions to read r_offset from external (target order) reloc
9326 entry. Faster than bfd_getl32 et al, because we let the compiler
9327 know the value is aligned. */
9330 ext32l_r_offset (const void *p
)
9337 const union aligned32
*a
9338 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9340 uint32_t aval
= ( (uint32_t) a
->c
[0]
9341 | (uint32_t) a
->c
[1] << 8
9342 | (uint32_t) a
->c
[2] << 16
9343 | (uint32_t) a
->c
[3] << 24);
9348 ext32b_r_offset (const void *p
)
9355 const union aligned32
*a
9356 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9358 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
9359 | (uint32_t) a
->c
[1] << 16
9360 | (uint32_t) a
->c
[2] << 8
9361 | (uint32_t) a
->c
[3]);
9366 ext64l_r_offset (const void *p
)
9373 const union aligned64
*a
9374 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9376 uint64_t aval
= ( (uint64_t) a
->c
[0]
9377 | (uint64_t) a
->c
[1] << 8
9378 | (uint64_t) a
->c
[2] << 16
9379 | (uint64_t) a
->c
[3] << 24
9380 | (uint64_t) a
->c
[4] << 32
9381 | (uint64_t) a
->c
[5] << 40
9382 | (uint64_t) a
->c
[6] << 48
9383 | (uint64_t) a
->c
[7] << 56);
9388 ext64b_r_offset (const void *p
)
9395 const union aligned64
*a
9396 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9398 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9399 | (uint64_t) a
->c
[1] << 48
9400 | (uint64_t) a
->c
[2] << 40
9401 | (uint64_t) a
->c
[3] << 32
9402 | (uint64_t) a
->c
[4] << 24
9403 | (uint64_t) a
->c
[5] << 16
9404 | (uint64_t) a
->c
[6] << 8
9405 | (uint64_t) a
->c
[7]);
9409 /* When performing a relocatable link, the input relocations are
9410 preserved. But, if they reference global symbols, the indices
9411 referenced must be updated. Update all the relocations found in
9415 elf_link_adjust_relocs (bfd
*abfd
,
9417 struct bfd_elf_section_reloc_data
*reldata
,
9419 struct bfd_link_info
*info
)
9422 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9424 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9425 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9426 bfd_vma r_type_mask
;
9428 unsigned int count
= reldata
->count
;
9429 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9431 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9433 swap_in
= bed
->s
->swap_reloc_in
;
9434 swap_out
= bed
->s
->swap_reloc_out
;
9436 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9438 swap_in
= bed
->s
->swap_reloca_in
;
9439 swap_out
= bed
->s
->swap_reloca_out
;
9444 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9447 if (bed
->s
->arch_size
== 32)
9454 r_type_mask
= 0xffffffff;
9458 erela
= reldata
->hdr
->contents
;
9459 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9461 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9464 if (*rel_hash
== NULL
)
9467 if ((*rel_hash
)->indx
== -2
9468 && info
->gc_sections
9469 && ! info
->gc_keep_exported
)
9471 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9472 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9474 (*rel_hash
)->root
.root
.string
);
9475 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9477 bfd_set_error (bfd_error_invalid_operation
);
9480 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9482 (*swap_in
) (abfd
, erela
, irela
);
9483 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9484 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9485 | (irela
[j
].r_info
& r_type_mask
));
9486 (*swap_out
) (abfd
, irela
, erela
);
9489 if (bed
->elf_backend_update_relocs
)
9490 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9492 if (sort
&& count
!= 0)
9494 bfd_vma (*ext_r_off
) (const void *);
9497 bfd_byte
*base
, *end
, *p
, *loc
;
9498 bfd_byte
*buf
= NULL
;
9500 if (bed
->s
->arch_size
== 32)
9502 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9503 ext_r_off
= ext32l_r_offset
;
9504 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9505 ext_r_off
= ext32b_r_offset
;
9511 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9512 ext_r_off
= ext64l_r_offset
;
9513 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9514 ext_r_off
= ext64b_r_offset
;
9519 /* Must use a stable sort here. A modified insertion sort,
9520 since the relocs are mostly sorted already. */
9521 elt_size
= reldata
->hdr
->sh_entsize
;
9522 base
= reldata
->hdr
->contents
;
9523 end
= base
+ count
* elt_size
;
9524 if (elt_size
> sizeof (Elf64_External_Rela
))
9527 /* Ensure the first element is lowest. This acts as a sentinel,
9528 speeding the main loop below. */
9529 r_off
= (*ext_r_off
) (base
);
9530 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9532 bfd_vma r_off2
= (*ext_r_off
) (p
);
9541 /* Don't just swap *base and *loc as that changes the order
9542 of the original base[0] and base[1] if they happen to
9543 have the same r_offset. */
9544 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9545 memcpy (onebuf
, loc
, elt_size
);
9546 memmove (base
+ elt_size
, base
, loc
- base
);
9547 memcpy (base
, onebuf
, elt_size
);
9550 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9552 /* base to p is sorted, *p is next to insert. */
9553 r_off
= (*ext_r_off
) (p
);
9554 /* Search the sorted region for location to insert. */
9556 while (r_off
< (*ext_r_off
) (loc
))
9561 /* Chances are there is a run of relocs to insert here,
9562 from one of more input files. Files are not always
9563 linked in order due to the way elf_link_input_bfd is
9564 called. See pr17666. */
9565 size_t sortlen
= p
- loc
;
9566 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9567 size_t runlen
= elt_size
;
9568 bfd_vma r_off_runend
= r_off
;
9569 bfd_vma r_off_runend_next
;
9570 size_t buf_size
= 96 * 1024;
9571 while (p
+ runlen
< end
9572 && (sortlen
<= buf_size
9573 || runlen
+ elt_size
<= buf_size
)
9574 /* run must not break the ordering of base..loc+1 */
9575 && r_off2
> (r_off_runend_next
= (*ext_r_off
) (p
+ runlen
))
9576 /* run must be already sorted */
9577 && r_off_runend_next
>= r_off_runend
)
9580 r_off_runend
= r_off_runend_next
;
9584 buf
= bfd_malloc (buf_size
);
9588 if (runlen
< sortlen
)
9590 memcpy (buf
, p
, runlen
);
9591 memmove (loc
+ runlen
, loc
, sortlen
);
9592 memcpy (loc
, buf
, runlen
);
9596 memcpy (buf
, loc
, sortlen
);
9597 memmove (loc
, p
, runlen
);
9598 memcpy (loc
+ runlen
, buf
, sortlen
);
9600 p
+= runlen
- elt_size
;
9603 /* Hashes are no longer valid. */
9604 free (reldata
->hashes
);
9605 reldata
->hashes
= NULL
;
9611 struct elf_link_sort_rela
9617 enum elf_reloc_type_class type
;
9618 /* We use this as an array of size int_rels_per_ext_rel. */
9619 Elf_Internal_Rela rela
[1];
9622 /* qsort stability here and for cmp2 is only an issue if multiple
9623 dynamic relocations are emitted at the same address. But targets
9624 that apply a series of dynamic relocations each operating on the
9625 result of the prior relocation can't use -z combreloc as
9626 implemented anyway. Such schemes tend to be broken by sorting on
9627 symbol index. That leaves dynamic NONE relocs as the only other
9628 case where ld might emit multiple relocs at the same address, and
9629 those are only emitted due to target bugs. */
9632 elf_link_sort_cmp1 (const void *A
, const void *B
)
9634 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9635 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9636 int relativea
, relativeb
;
9638 relativea
= a
->type
== reloc_class_relative
;
9639 relativeb
= b
->type
== reloc_class_relative
;
9641 if (relativea
< relativeb
)
9643 if (relativea
> relativeb
)
9645 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9647 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9649 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9651 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9657 elf_link_sort_cmp2 (const void *A
, const void *B
)
9659 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9660 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9662 if (a
->type
< b
->type
)
9664 if (a
->type
> b
->type
)
9666 if (a
->u
.offset
< b
->u
.offset
)
9668 if (a
->u
.offset
> b
->u
.offset
)
9670 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9672 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9678 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9680 asection
*dynamic_relocs
;
9683 bfd_size_type count
, size
;
9684 size_t i
, ret
, sort_elt
, ext_size
;
9685 bfd_byte
*sort
, *s_non_relative
, *p
;
9686 struct elf_link_sort_rela
*sq
;
9687 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9688 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9689 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9690 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9691 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9692 struct bfd_link_order
*lo
;
9696 /* Find a dynamic reloc section. */
9697 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9698 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9699 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9700 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9702 bool use_rela_initialised
= false;
9704 /* This is just here to stop gcc from complaining.
9705 Its initialization checking code is not perfect. */
9708 /* Both sections are present. Examine the sizes
9709 of the indirect sections to help us choose. */
9710 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9711 if (lo
->type
== bfd_indirect_link_order
)
9713 asection
*o
= lo
->u
.indirect
.section
;
9715 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9717 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9718 /* Section size is divisible by both rel and rela sizes.
9719 It is of no help to us. */
9723 /* Section size is only divisible by rela. */
9724 if (use_rela_initialised
&& !use_rela
)
9726 _bfd_error_handler (_("%pB: unable to sort relocs - "
9727 "they are in more than one size"),
9729 bfd_set_error (bfd_error_invalid_operation
);
9735 use_rela_initialised
= true;
9739 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9741 /* Section size is only divisible by rel. */
9742 if (use_rela_initialised
&& use_rela
)
9744 _bfd_error_handler (_("%pB: unable to sort relocs - "
9745 "they are in more than one size"),
9747 bfd_set_error (bfd_error_invalid_operation
);
9753 use_rela_initialised
= true;
9758 /* The section size is not divisible by either -
9759 something is wrong. */
9760 _bfd_error_handler (_("%pB: unable to sort relocs - "
9761 "they are of an unknown size"), abfd
);
9762 bfd_set_error (bfd_error_invalid_operation
);
9767 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9768 if (lo
->type
== bfd_indirect_link_order
)
9770 asection
*o
= lo
->u
.indirect
.section
;
9772 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9774 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9775 /* Section size is divisible by both rel and rela sizes.
9776 It is of no help to us. */
9780 /* Section size is only divisible by rela. */
9781 if (use_rela_initialised
&& !use_rela
)
9783 _bfd_error_handler (_("%pB: unable to sort relocs - "
9784 "they are in more than one size"),
9786 bfd_set_error (bfd_error_invalid_operation
);
9792 use_rela_initialised
= true;
9796 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9798 /* Section size is only divisible by rel. */
9799 if (use_rela_initialised
&& use_rela
)
9801 _bfd_error_handler (_("%pB: unable to sort relocs - "
9802 "they are in more than one size"),
9804 bfd_set_error (bfd_error_invalid_operation
);
9810 use_rela_initialised
= true;
9815 /* The section size is not divisible by either -
9816 something is wrong. */
9817 _bfd_error_handler (_("%pB: unable to sort relocs - "
9818 "they are of an unknown size"), abfd
);
9819 bfd_set_error (bfd_error_invalid_operation
);
9824 if (! use_rela_initialised
)
9828 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9830 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9837 dynamic_relocs
= rela_dyn
;
9838 ext_size
= bed
->s
->sizeof_rela
;
9839 swap_in
= bed
->s
->swap_reloca_in
;
9840 swap_out
= bed
->s
->swap_reloca_out
;
9844 dynamic_relocs
= rel_dyn
;
9845 ext_size
= bed
->s
->sizeof_rel
;
9846 swap_in
= bed
->s
->swap_reloc_in
;
9847 swap_out
= bed
->s
->swap_reloc_out
;
9851 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9852 if (lo
->type
== bfd_indirect_link_order
)
9853 size
+= lo
->u
.indirect
.section
->size
;
9855 if (size
!= dynamic_relocs
->size
)
9858 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9859 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9861 count
= dynamic_relocs
->size
/ ext_size
;
9864 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9868 (*info
->callbacks
->warning
)
9869 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9873 if (bed
->s
->arch_size
== 32)
9874 r_sym_mask
= ~(bfd_vma
) 0xff;
9876 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9878 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9879 if (lo
->type
== bfd_indirect_link_order
)
9881 bfd_byte
*erel
, *erelend
;
9882 asection
*o
= lo
->u
.indirect
.section
;
9884 if (o
->contents
== NULL
&& o
->size
!= 0)
9886 /* This is a reloc section that is being handled as a normal
9887 section. See bfd_section_from_shdr. We can't combine
9888 relocs in this case. */
9893 erelend
= o
->contents
+ o
->size
;
9894 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9896 while (erel
< erelend
)
9898 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9900 (*swap_in
) (abfd
, erel
, s
->rela
);
9901 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9902 s
->u
.sym_mask
= r_sym_mask
;
9908 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9910 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9912 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9913 if (s
->type
!= reloc_class_relative
)
9919 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9920 for (; i
< count
; i
++, p
+= sort_elt
)
9922 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9923 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9925 sp
->u
.offset
= sq
->rela
->r_offset
;
9928 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9930 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9931 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9933 /* We have plt relocs in .rela.dyn. */
9934 sq
= (struct elf_link_sort_rela
*) sort
;
9935 for (i
= 0; i
< count
; i
++)
9936 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9938 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9940 struct bfd_link_order
**plo
;
9941 /* Put srelplt link_order last. This is so the output_offset
9942 set in the next loop is correct for DT_JMPREL. */
9943 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9944 if ((*plo
)->type
== bfd_indirect_link_order
9945 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9951 plo
= &(*plo
)->next
;
9954 dynamic_relocs
->map_tail
.link_order
= lo
;
9959 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9960 if (lo
->type
== bfd_indirect_link_order
)
9962 bfd_byte
*erel
, *erelend
;
9963 asection
*o
= lo
->u
.indirect
.section
;
9966 erelend
= o
->contents
+ o
->size
;
9967 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9968 while (erel
< erelend
)
9970 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9971 (*swap_out
) (abfd
, s
->rela
, erel
);
9978 *psec
= dynamic_relocs
;
9982 /* Add a symbol to the output symbol string table. */
9985 elf_link_output_symstrtab (void *finf
,
9987 Elf_Internal_Sym
*elfsym
,
9988 asection
*input_sec
,
9989 struct elf_link_hash_entry
*h
)
9991 struct elf_final_link_info
*flinfo
= finf
;
9992 int (*output_symbol_hook
)
9993 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9994 struct elf_link_hash_entry
*);
9995 struct elf_link_hash_table
*hash_table
;
9996 const struct elf_backend_data
*bed
;
9997 bfd_size_type strtabsize
;
9999 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
10001 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10002 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
10003 if (output_symbol_hook
!= NULL
)
10005 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
10010 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
10011 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
10012 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
10013 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
10015 if (name
== NULL
|| *name
== '\0')
10016 elfsym
->st_name
= (unsigned long) -1;
10019 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
10020 to get the final offset for st_name. */
10021 char *versioned_name
= (char *) name
;
10024 if (h
->versioned
== versioned
&& h
->def_dynamic
)
10026 /* Keep only one '@' for versioned symbols defined in
10028 char *version
= strrchr (name
, ELF_VER_CHR
);
10029 char *base_end
= strchr (name
, ELF_VER_CHR
);
10030 if (version
!= base_end
)
10033 size_t len
= strlen (name
);
10034 versioned_name
= bfd_alloc (flinfo
->output_bfd
, len
);
10035 if (versioned_name
== NULL
)
10037 base_len
= base_end
- name
;
10038 memcpy (versioned_name
, name
, base_len
);
10039 memcpy (versioned_name
+ base_len
, version
,
10044 else if (flinfo
->info
->unique_symbol
10045 && ELF_ST_BIND (elfsym
->st_info
) == STB_LOCAL
)
10047 struct local_hash_entry
*lh
;
10051 switch (ELF_ST_TYPE (elfsym
->st_info
))
10057 lh
= (struct local_hash_entry
*) bfd_hash_lookup
10058 (&flinfo
->local_hash_table
, name
, true, false);
10061 /* Always append ".COUNT" to local symbols to avoid
10062 potential conflicts with local symbol "XXX.COUNT". */
10063 sprintf (buf
, "%lx", lh
->count
);
10064 base_len
= lh
->size
;
10067 base_len
= strlen (name
);
10068 lh
->size
= base_len
;
10070 count_len
= strlen (buf
);
10071 versioned_name
= bfd_alloc (flinfo
->output_bfd
,
10072 base_len
+ count_len
+ 2);
10073 if (versioned_name
== NULL
)
10075 memcpy (versioned_name
, name
, base_len
);
10076 versioned_name
[base_len
] = '.';
10077 memcpy (versioned_name
+ base_len
+ 1, buf
,
10084 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
10085 versioned_name
, false);
10086 if (elfsym
->st_name
== (unsigned long) -1)
10090 hash_table
= elf_hash_table (flinfo
->info
);
10091 strtabsize
= hash_table
->strtabsize
;
10092 if (strtabsize
<= flinfo
->output_bfd
->symcount
)
10094 strtabsize
+= strtabsize
;
10095 hash_table
->strtabsize
= strtabsize
;
10096 strtabsize
*= sizeof (*hash_table
->strtab
);
10098 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
10100 if (hash_table
->strtab
== NULL
)
10103 hash_table
->strtab
[flinfo
->output_bfd
->symcount
].sym
= *elfsym
;
10104 hash_table
->strtab
[flinfo
->output_bfd
->symcount
].dest_index
10105 = flinfo
->output_bfd
->symcount
;
10106 flinfo
->output_bfd
->symcount
+= 1;
10111 /* Swap symbols out to the symbol table and flush the output symbols to
10115 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
10117 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
10120 const struct elf_backend_data
*bed
;
10122 Elf_Internal_Shdr
*hdr
;
10126 if (flinfo
->output_bfd
->symcount
== 0)
10129 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
10131 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10133 amt
= bed
->s
->sizeof_sym
* flinfo
->output_bfd
->symcount
;
10134 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
10135 if (symbuf
== NULL
)
10138 if (flinfo
->symshndxbuf
)
10140 amt
= sizeof (Elf_External_Sym_Shndx
);
10141 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
10142 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
10143 if (flinfo
->symshndxbuf
== NULL
)
10150 /* Now swap out the symbols. */
10151 for (i
= 0; i
< flinfo
->output_bfd
->symcount
; i
++)
10153 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
10154 if (elfsym
->sym
.st_name
== (unsigned long) -1)
10155 elfsym
->sym
.st_name
= 0;
10157 elfsym
->sym
.st_name
10158 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
10159 elfsym
->sym
.st_name
);
10161 /* Inform the linker of the addition of this symbol. */
10163 if (flinfo
->info
->callbacks
->ctf_new_symbol
)
10164 flinfo
->info
->callbacks
->ctf_new_symbol (elfsym
->dest_index
,
10167 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
10168 ((bfd_byte
*) symbuf
10169 + (elfsym
->dest_index
10170 * bed
->s
->sizeof_sym
)),
10171 NPTR_ADD (flinfo
->symshndxbuf
,
10172 elfsym
->dest_index
));
10175 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
10176 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
10177 amt
= bed
->s
->sizeof_sym
* flinfo
->output_bfd
->symcount
;
10178 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
10179 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
10181 hdr
->sh_size
+= amt
;
10189 free (hash_table
->strtab
);
10190 hash_table
->strtab
= NULL
;
10195 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
10198 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
10200 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
10201 && sym
->st_shndx
< SHN_LORESERVE
)
10203 /* The gABI doesn't support dynamic symbols in output sections
10206 /* xgettext:c-format */
10207 (_("%pB: too many sections: %d (>= %d)"),
10208 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
10209 bfd_set_error (bfd_error_nonrepresentable_section
);
10215 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
10216 allowing an unsatisfied unversioned symbol in the DSO to match a
10217 versioned symbol that would normally require an explicit version.
10218 We also handle the case that a DSO references a hidden symbol
10219 which may be satisfied by a versioned symbol in another DSO. */
10222 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
10223 const struct elf_backend_data
*bed
,
10224 struct elf_link_hash_entry
*h
)
10227 struct elf_link_loaded_list
*loaded
;
10229 if (!is_elf_hash_table (info
->hash
))
10232 /* Check indirect symbol. */
10233 while (h
->root
.type
== bfd_link_hash_indirect
)
10234 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10236 switch (h
->root
.type
)
10242 case bfd_link_hash_undefined
:
10243 case bfd_link_hash_undefweak
:
10244 abfd
= h
->root
.u
.undef
.abfd
;
10246 || (abfd
->flags
& DYNAMIC
) == 0
10247 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
10251 case bfd_link_hash_defined
:
10252 case bfd_link_hash_defweak
:
10253 abfd
= h
->root
.u
.def
.section
->owner
;
10256 case bfd_link_hash_common
:
10257 abfd
= h
->root
.u
.c
.p
->section
->owner
;
10260 BFD_ASSERT (abfd
!= NULL
);
10262 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
10264 loaded
= loaded
->next
)
10267 Elf_Internal_Shdr
*hdr
;
10269 size_t extsymcount
;
10271 Elf_Internal_Shdr
*versymhdr
;
10272 Elf_Internal_Sym
*isym
;
10273 Elf_Internal_Sym
*isymend
;
10274 Elf_Internal_Sym
*isymbuf
;
10275 Elf_External_Versym
*ever
;
10276 Elf_External_Versym
*extversym
;
10278 input
= loaded
->abfd
;
10280 /* We check each DSO for a possible hidden versioned definition. */
10282 || elf_dynversym (input
) == 0)
10285 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
10287 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10288 if (elf_bad_symtab (input
))
10290 extsymcount
= symcount
;
10295 extsymcount
= symcount
- hdr
->sh_info
;
10296 extsymoff
= hdr
->sh_info
;
10299 if (extsymcount
== 0)
10302 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
10304 if (isymbuf
== NULL
)
10307 /* Read in any version definitions. */
10308 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
10309 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
10310 || (extversym
= (Elf_External_Versym
*)
10311 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
10312 versymhdr
->sh_size
)) == NULL
)
10318 ever
= extversym
+ extsymoff
;
10319 isymend
= isymbuf
+ extsymcount
;
10320 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
10323 Elf_Internal_Versym iver
;
10324 unsigned short version_index
;
10326 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
10327 || isym
->st_shndx
== SHN_UNDEF
)
10330 name
= bfd_elf_string_from_elf_section (input
,
10333 if (strcmp (name
, h
->root
.root
.string
) != 0)
10336 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
10338 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
10339 && !(h
->def_regular
10340 && h
->forced_local
))
10342 /* If we have a non-hidden versioned sym, then it should
10343 have provided a definition for the undefined sym unless
10344 it is defined in a non-shared object and forced local.
10349 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
10350 if (version_index
== 1 || version_index
== 2)
10352 /* This is the base or first version. We can use it. */
10366 /* Convert ELF common symbol TYPE. */
10369 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
10371 /* Commom symbol can only appear in relocatable link. */
10372 if (!bfd_link_relocatable (info
))
10374 switch (info
->elf_stt_common
)
10378 case elf_stt_common
:
10381 case no_elf_stt_common
:
10388 /* Add an external symbol to the symbol table. This is called from
10389 the hash table traversal routine. When generating a shared object,
10390 we go through the symbol table twice. The first time we output
10391 anything that might have been forced to local scope in a version
10392 script. The second time we output the symbols that are still
10396 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
10398 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
10399 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
10400 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
10402 Elf_Internal_Sym sym
;
10403 asection
*input_sec
;
10404 const struct elf_backend_data
*bed
;
10409 if (h
->root
.type
== bfd_link_hash_warning
)
10411 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10412 if (h
->root
.type
== bfd_link_hash_new
)
10416 /* Decide whether to output this symbol in this pass. */
10417 if (eoinfo
->localsyms
)
10419 if (!h
->forced_local
)
10424 if (h
->forced_local
)
10428 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10430 if (h
->root
.type
== bfd_link_hash_undefined
)
10432 /* If we have an undefined symbol reference here then it must have
10433 come from a shared library that is being linked in. (Undefined
10434 references in regular files have already been handled unless
10435 they are in unreferenced sections which are removed by garbage
10437 bool ignore_undef
= false;
10439 /* Some symbols may be special in that the fact that they're
10440 undefined can be safely ignored - let backend determine that. */
10441 if (bed
->elf_backend_ignore_undef_symbol
)
10442 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
10444 /* If we are reporting errors for this situation then do so now. */
10446 && h
->ref_dynamic_nonweak
10447 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
10448 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10449 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10451 flinfo
->info
->callbacks
->undefined_symbol
10452 (flinfo
->info
, h
->root
.root
.string
,
10453 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10454 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10455 && !flinfo
->info
->warn_unresolved_syms
);
10458 /* Strip a global symbol defined in a discarded section. */
10463 /* We should also warn if a forced local symbol is referenced from
10464 shared libraries. */
10465 if (bfd_link_executable (flinfo
->info
)
10470 && h
->ref_dynamic_nonweak
10471 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10475 struct elf_link_hash_entry
*hi
= h
;
10477 /* Check indirect symbol. */
10478 while (hi
->root
.type
== bfd_link_hash_indirect
)
10479 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10481 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10482 /* xgettext:c-format */
10483 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10484 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10485 /* xgettext:c-format */
10486 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10488 /* xgettext:c-format */
10489 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10490 def_bfd
= flinfo
->output_bfd
;
10491 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10492 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10493 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10494 h
->root
.root
.string
, def_bfd
);
10495 bfd_set_error (bfd_error_bad_value
);
10496 eoinfo
->failed
= true;
10500 /* We don't want to output symbols that have never been mentioned by
10501 a regular file, or that we have been told to strip. However, if
10502 h->indx is set to -2, the symbol is used by a reloc and we must
10507 else if ((h
->def_dynamic
10509 || h
->root
.type
== bfd_link_hash_new
)
10511 && !h
->ref_regular
)
10513 else if (flinfo
->info
->strip
== strip_all
)
10515 else if (flinfo
->info
->strip
== strip_some
10516 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10517 h
->root
.root
.string
, false, false) == NULL
)
10519 else if ((h
->root
.type
== bfd_link_hash_defined
10520 || h
->root
.type
== bfd_link_hash_defweak
)
10521 && ((flinfo
->info
->strip_discarded
10522 && discarded_section (h
->root
.u
.def
.section
))
10523 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10524 && h
->root
.u
.def
.section
->owner
!= NULL
10525 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10527 else if ((h
->root
.type
== bfd_link_hash_undefined
10528 || h
->root
.type
== bfd_link_hash_undefweak
)
10529 && h
->root
.u
.undef
.abfd
!= NULL
10530 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10535 /* If we're stripping it, and it's not a dynamic symbol, there's
10536 nothing else to do. However, if it is a forced local symbol or
10537 an ifunc symbol we need to give the backend finish_dynamic_symbol
10538 function a chance to make it dynamic. */
10540 && h
->dynindx
== -1
10541 && type
!= STT_GNU_IFUNC
10542 && !h
->forced_local
)
10546 sym
.st_size
= h
->size
;
10547 sym
.st_other
= h
->other
;
10548 switch (h
->root
.type
)
10551 case bfd_link_hash_new
:
10552 case bfd_link_hash_warning
:
10556 case bfd_link_hash_undefined
:
10557 case bfd_link_hash_undefweak
:
10558 input_sec
= bfd_und_section_ptr
;
10559 sym
.st_shndx
= SHN_UNDEF
;
10562 case bfd_link_hash_defined
:
10563 case bfd_link_hash_defweak
:
10565 input_sec
= h
->root
.u
.def
.section
;
10566 if (input_sec
->output_section
!= NULL
)
10569 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10570 input_sec
->output_section
);
10571 if (sym
.st_shndx
== SHN_BAD
)
10574 /* xgettext:c-format */
10575 (_("%pB: could not find output section %pA for input section %pA"),
10576 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10577 bfd_set_error (bfd_error_nonrepresentable_section
);
10578 eoinfo
->failed
= true;
10582 /* ELF symbols in relocatable files are section relative,
10583 but in nonrelocatable files they are virtual
10585 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10586 if (!bfd_link_relocatable (flinfo
->info
))
10588 sym
.st_value
+= input_sec
->output_section
->vma
;
10589 if (h
->type
== STT_TLS
)
10591 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10592 if (tls_sec
!= NULL
)
10593 sym
.st_value
-= tls_sec
->vma
;
10599 BFD_ASSERT (input_sec
->owner
== NULL
10600 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10601 sym
.st_shndx
= SHN_UNDEF
;
10602 input_sec
= bfd_und_section_ptr
;
10607 case bfd_link_hash_common
:
10608 input_sec
= h
->root
.u
.c
.p
->section
;
10609 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10610 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10613 case bfd_link_hash_indirect
:
10614 /* These symbols are created by symbol versioning. They point
10615 to the decorated version of the name. For example, if the
10616 symbol foo@@GNU_1.2 is the default, which should be used when
10617 foo is used with no version, then we add an indirect symbol
10618 foo which points to foo@@GNU_1.2. We ignore these symbols,
10619 since the indirected symbol is already in the hash table. */
10623 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10624 switch (h
->root
.type
)
10626 case bfd_link_hash_common
:
10627 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10629 case bfd_link_hash_defined
:
10630 case bfd_link_hash_defweak
:
10631 if (bed
->common_definition (&sym
))
10632 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10636 case bfd_link_hash_undefined
:
10637 case bfd_link_hash_undefweak
:
10643 if (h
->forced_local
)
10645 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10646 /* Turn off visibility on local symbol. */
10647 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10649 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10650 else if (h
->unique_global
&& h
->def_regular
)
10651 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10652 else if (h
->root
.type
== bfd_link_hash_undefweak
10653 || h
->root
.type
== bfd_link_hash_defweak
)
10654 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10656 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10657 sym
.st_target_internal
= h
->target_internal
;
10659 /* Give the processor backend a chance to tweak the symbol value,
10660 and also to finish up anything that needs to be done for this
10661 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10662 forced local syms when non-shared is due to a historical quirk.
10663 STT_GNU_IFUNC symbol must go through PLT. */
10664 if ((h
->type
== STT_GNU_IFUNC
10666 && !bfd_link_relocatable (flinfo
->info
))
10667 || ((h
->dynindx
!= -1
10668 || h
->forced_local
)
10669 && ((bfd_link_pic (flinfo
->info
)
10670 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10671 || h
->root
.type
!= bfd_link_hash_undefweak
))
10672 || !h
->forced_local
)
10673 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10675 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10676 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10678 eoinfo
->failed
= true;
10683 /* If we are marking the symbol as undefined, and there are no
10684 non-weak references to this symbol from a regular object, then
10685 mark the symbol as weak undefined; if there are non-weak
10686 references, mark the symbol as strong. We can't do this earlier,
10687 because it might not be marked as undefined until the
10688 finish_dynamic_symbol routine gets through with it. */
10689 if (sym
.st_shndx
== SHN_UNDEF
10691 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10692 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10695 type
= ELF_ST_TYPE (sym
.st_info
);
10697 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10698 if (type
== STT_GNU_IFUNC
)
10701 if (h
->ref_regular_nonweak
)
10702 bindtype
= STB_GLOBAL
;
10704 bindtype
= STB_WEAK
;
10705 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10708 /* If this is a symbol defined in a dynamic library, don't use the
10709 symbol size from the dynamic library. Relinking an executable
10710 against a new library may introduce gratuitous changes in the
10711 executable's symbols if we keep the size. */
10712 if (sym
.st_shndx
== SHN_UNDEF
10717 /* If a non-weak symbol with non-default visibility is not defined
10718 locally, it is a fatal error. */
10719 if (!bfd_link_relocatable (flinfo
->info
)
10720 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10721 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10722 && h
->root
.type
== bfd_link_hash_undefined
10723 && !h
->def_regular
)
10727 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10728 /* xgettext:c-format */
10729 msg
= _("%pB: protected symbol `%s' isn't defined");
10730 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10731 /* xgettext:c-format */
10732 msg
= _("%pB: internal symbol `%s' isn't defined");
10734 /* xgettext:c-format */
10735 msg
= _("%pB: hidden symbol `%s' isn't defined");
10736 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10737 bfd_set_error (bfd_error_bad_value
);
10738 eoinfo
->failed
= true;
10742 /* If this symbol should be put in the .dynsym section, then put it
10743 there now. We already know the symbol index. We also fill in
10744 the entry in the .hash section. */
10745 if (h
->dynindx
!= -1
10746 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10747 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10748 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10752 /* Since there is no version information in the dynamic string,
10753 if there is no version info in symbol version section, we will
10754 have a run-time problem if not linking executable, referenced
10755 by shared library, or not bound locally. */
10756 if (h
->verinfo
.verdef
== NULL
10757 && (!bfd_link_executable (flinfo
->info
)
10759 || !h
->def_regular
))
10761 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10763 if (p
&& p
[1] != '\0')
10766 /* xgettext:c-format */
10767 (_("%pB: no symbol version section for versioned symbol `%s'"),
10768 flinfo
->output_bfd
, h
->root
.root
.string
);
10769 eoinfo
->failed
= true;
10774 sym
.st_name
= h
->dynstr_index
;
10775 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10776 + h
->dynindx
* bed
->s
->sizeof_sym
);
10777 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10779 eoinfo
->failed
= true;
10783 /* Inform the linker of the addition of this symbol. */
10785 if (flinfo
->info
->callbacks
->ctf_new_dynsym
)
10786 flinfo
->info
->callbacks
->ctf_new_dynsym (h
->dynindx
, &sym
);
10788 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10790 if (flinfo
->hash_sec
!= NULL
)
10792 size_t hash_entry_size
;
10793 bfd_byte
*bucketpos
;
10795 size_t bucketcount
;
10798 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10799 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10802 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10803 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10804 + (bucket
+ 2) * hash_entry_size
);
10805 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10806 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10808 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10809 ((bfd_byte
*) flinfo
->hash_sec
->contents
10810 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10813 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10815 Elf_Internal_Versym iversym
;
10816 Elf_External_Versym
*eversym
;
10818 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10820 if (h
->verinfo
.verdef
== NULL
10821 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10822 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10823 iversym
.vs_vers
= 1;
10825 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10829 if (h
->verinfo
.vertree
== NULL
)
10830 iversym
.vs_vers
= 1;
10832 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10833 if (flinfo
->info
->create_default_symver
)
10837 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10838 defined locally. */
10839 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10840 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10842 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10843 eversym
+= h
->dynindx
;
10844 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10848 /* If the symbol is undefined, and we didn't output it to .dynsym,
10849 strip it from .symtab too. Obviously we can't do this for
10850 relocatable output or when needed for --emit-relocs. */
10851 else if (input_sec
== bfd_und_section_ptr
10853 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10854 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10855 && !bfd_link_relocatable (flinfo
->info
))
10858 /* Also strip others that we couldn't earlier due to dynamic symbol
10862 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10865 /* Output a FILE symbol so that following locals are not associated
10866 with the wrong input file. We need one for forced local symbols
10867 if we've seen more than one FILE symbol or when we have exactly
10868 one FILE symbol but global symbols are present in a file other
10869 than the one with the FILE symbol. We also need one if linker
10870 defined symbols are present. In practice these conditions are
10871 always met, so just emit the FILE symbol unconditionally. */
10872 if (eoinfo
->localsyms
10873 && !eoinfo
->file_sym_done
10874 && eoinfo
->flinfo
->filesym_count
!= 0)
10876 Elf_Internal_Sym fsym
;
10878 memset (&fsym
, 0, sizeof (fsym
));
10879 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10880 fsym
.st_shndx
= SHN_ABS
;
10881 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10882 bfd_und_section_ptr
, NULL
))
10885 eoinfo
->file_sym_done
= true;
10888 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10889 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10893 eoinfo
->failed
= true;
10898 else if (h
->indx
== -2)
10904 /* Return TRUE if special handling is done for relocs in SEC against
10905 symbols defined in discarded sections. */
10908 elf_section_ignore_discarded_relocs (asection
*sec
)
10910 const struct elf_backend_data
*bed
;
10912 switch (sec
->sec_info_type
)
10914 case SEC_INFO_TYPE_STABS
:
10915 case SEC_INFO_TYPE_EH_FRAME
:
10916 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10917 case SEC_INFO_TYPE_SFRAME
:
10923 bed
= get_elf_backend_data (sec
->owner
);
10924 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10925 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10931 /* Return a mask saying how ld should treat relocations in SEC against
10932 symbols defined in discarded sections. If this function returns
10933 COMPLAIN set, ld will issue a warning message. If this function
10934 returns PRETEND set, and the discarded section was link-once and the
10935 same size as the kept link-once section, ld will pretend that the
10936 symbol was actually defined in the kept section. Otherwise ld will
10937 zero the reloc (at least that is the intent, but some cooperation by
10938 the target dependent code is needed, particularly for REL targets). */
10941 _bfd_elf_default_action_discarded (asection
*sec
)
10943 const struct elf_backend_data
*bed
;
10944 bed
= get_elf_backend_data (sec
->owner
);
10946 if (sec
->flags
& SEC_DEBUGGING
)
10949 if (strcmp (".eh_frame", sec
->name
) == 0)
10952 if (bed
->elf_backend_can_make_multiple_eh_frame
10953 && strncmp (sec
->name
, ".eh_frame.", 10) == 0)
10956 if (strcmp (".sframe", sec
->name
) == 0)
10959 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10962 return COMPLAIN
| PRETEND
;
10965 /* Find a match between a section and a member of a section group. */
10968 match_group_member (asection
*sec
, asection
*group
,
10969 struct bfd_link_info
*info
)
10971 asection
*first
= elf_next_in_group (group
);
10972 asection
*s
= first
;
10976 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10979 s
= elf_next_in_group (s
);
10987 /* Check if the kept section of a discarded section SEC can be used
10988 to replace it. Return the replacement if it is OK. Otherwise return
10992 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10996 kept
= sec
->kept_section
;
10999 if ((kept
->flags
& SEC_GROUP
) != 0)
11000 kept
= match_group_member (sec
, kept
, info
);
11003 if ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
11004 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
))
11008 /* Get the real kept section. */
11010 for (next
= kept
->kept_section
;
11012 next
= next
->kept_section
)
11016 sec
->kept_section
= kept
;
11021 /* Link an input file into the linker output file. This function
11022 handles all the sections and relocations of the input file at once.
11023 This is so that we only have to read the local symbols once, and
11024 don't have to keep them in memory. */
11027 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
11029 int (*relocate_section
)
11030 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
11031 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
11033 Elf_Internal_Shdr
*symtab_hdr
;
11034 size_t locsymcount
;
11036 Elf_Internal_Sym
*isymbuf
;
11037 Elf_Internal_Sym
*isym
;
11038 Elf_Internal_Sym
*isymend
;
11040 asection
**ppsection
;
11042 const struct elf_backend_data
*bed
;
11043 struct elf_link_hash_entry
**sym_hashes
;
11044 bfd_size_type address_size
;
11045 bfd_vma r_type_mask
;
11047 bool have_file_sym
= false;
11049 output_bfd
= flinfo
->output_bfd
;
11050 bed
= get_elf_backend_data (output_bfd
);
11051 relocate_section
= bed
->elf_backend_relocate_section
;
11053 /* If this is a dynamic object, we don't want to do anything here:
11054 we don't want the local symbols, and we don't want the section
11056 if ((input_bfd
->flags
& DYNAMIC
) != 0)
11059 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
11060 if (elf_bad_symtab (input_bfd
))
11062 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11067 locsymcount
= symtab_hdr
->sh_info
;
11068 extsymoff
= symtab_hdr
->sh_info
;
11071 /* Enable GNU OSABI features in the output BFD that are used in the input
11073 if (bed
->elf_osabi
== ELFOSABI_NONE
11074 || bed
->elf_osabi
== ELFOSABI_GNU
11075 || bed
->elf_osabi
== ELFOSABI_FREEBSD
)
11076 elf_tdata (output_bfd
)->has_gnu_osabi
11077 |= (elf_tdata (input_bfd
)->has_gnu_osabi
11078 & (bfd_link_relocatable (flinfo
->info
)
11079 ? -1 : ~elf_gnu_osabi_retain
));
11081 /* Read the local symbols. */
11082 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11083 if (isymbuf
== NULL
&& locsymcount
!= 0)
11085 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
11086 flinfo
->internal_syms
,
11087 flinfo
->external_syms
,
11088 flinfo
->locsym_shndx
);
11089 if (isymbuf
== NULL
)
11093 /* Find local symbol sections and adjust values of symbols in
11094 SEC_MERGE sections. Write out those local symbols we know are
11095 going into the output file. */
11096 isymend
= PTR_ADD (isymbuf
, locsymcount
);
11097 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
11099 isym
++, pindex
++, ppsection
++)
11103 Elf_Internal_Sym osym
;
11109 if (elf_bad_symtab (input_bfd
))
11111 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
11118 if (isym
->st_shndx
== SHN_UNDEF
)
11119 isec
= bfd_und_section_ptr
;
11120 else if (isym
->st_shndx
== SHN_ABS
)
11121 isec
= bfd_abs_section_ptr
;
11122 else if (isym
->st_shndx
== SHN_COMMON
)
11123 isec
= bfd_com_section_ptr
;
11126 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
11129 /* Don't attempt to output symbols with st_shnx in the
11130 reserved range other than SHN_ABS and SHN_COMMON. */
11131 isec
= bfd_und_section_ptr
;
11133 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
11134 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
11136 _bfd_merged_section_offset (output_bfd
, &isec
,
11137 elf_section_data (isec
)->sec_info
,
11143 /* Don't output the first, undefined, symbol. In fact, don't
11144 output any undefined local symbol. */
11145 if (isec
== bfd_und_section_ptr
)
11148 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
11150 /* We never output section symbols. Instead, we use the
11151 section symbol of the corresponding section in the output
11156 /* If we are stripping all symbols, we don't want to output this
11158 if (flinfo
->info
->strip
== strip_all
)
11161 /* If we are discarding all local symbols, we don't want to
11162 output this one. If we are generating a relocatable output
11163 file, then some of the local symbols may be required by
11164 relocs; we output them below as we discover that they are
11166 if (flinfo
->info
->discard
== discard_all
)
11169 /* If this symbol is defined in a section which we are
11170 discarding, we don't need to keep it. */
11171 if (isym
->st_shndx
< SHN_LORESERVE
11172 && (isec
->output_section
== NULL
11173 || bfd_section_removed_from_list (output_bfd
,
11174 isec
->output_section
)))
11177 /* Get the name of the symbol. */
11178 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
11183 /* See if we are discarding symbols with this name. */
11184 if ((flinfo
->info
->strip
== strip_some
11185 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, false, false)
11187 || (((flinfo
->info
->discard
== discard_sec_merge
11188 && (isec
->flags
& SEC_MERGE
)
11189 && !bfd_link_relocatable (flinfo
->info
))
11190 || flinfo
->info
->discard
== discard_l
)
11191 && bfd_is_local_label_name (input_bfd
, name
)))
11194 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
11196 if (input_bfd
->lto_output
)
11197 /* -flto puts a temp file name here. This means builds
11198 are not reproducible. Discard the symbol. */
11200 have_file_sym
= true;
11201 flinfo
->filesym_count
+= 1;
11203 if (!have_file_sym
)
11205 /* In the absence of debug info, bfd_find_nearest_line uses
11206 FILE symbols to determine the source file for local
11207 function symbols. Provide a FILE symbol here if input
11208 files lack such, so that their symbols won't be
11209 associated with a previous input file. It's not the
11210 source file, but the best we can do. */
11211 const char *filename
;
11212 have_file_sym
= true;
11213 flinfo
->filesym_count
+= 1;
11214 memset (&osym
, 0, sizeof (osym
));
11215 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
11216 osym
.st_shndx
= SHN_ABS
;
11217 if (input_bfd
->lto_output
)
11220 filename
= lbasename (bfd_get_filename (input_bfd
));
11221 if (!elf_link_output_symstrtab (flinfo
, filename
, &osym
,
11222 bfd_abs_section_ptr
, NULL
))
11228 /* Adjust the section index for the output file. */
11229 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11230 isec
->output_section
);
11231 if (osym
.st_shndx
== SHN_BAD
)
11234 /* ELF symbols in relocatable files are section relative, but
11235 in executable files they are virtual addresses. Note that
11236 this code assumes that all ELF sections have an associated
11237 BFD section with a reasonable value for output_offset; below
11238 we assume that they also have a reasonable value for
11239 output_section. Any special sections must be set up to meet
11240 these requirements. */
11241 osym
.st_value
+= isec
->output_offset
;
11242 if (!bfd_link_relocatable (flinfo
->info
))
11244 osym
.st_value
+= isec
->output_section
->vma
;
11245 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
11247 /* STT_TLS symbols are relative to PT_TLS segment base. */
11248 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
11249 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
11251 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
11256 indx
= bfd_get_symcount (output_bfd
);
11257 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
11264 if (bed
->s
->arch_size
== 32)
11266 r_type_mask
= 0xff;
11272 r_type_mask
= 0xffffffff;
11277 /* Relocate the contents of each section. */
11278 sym_hashes
= elf_sym_hashes (input_bfd
);
11279 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
11281 bfd_byte
*contents
;
11283 if (! o
->linker_mark
)
11285 /* This section was omitted from the link. */
11289 if (!flinfo
->info
->resolve_section_groups
11290 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
11292 /* Deal with the group signature symbol. */
11293 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
11294 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
11295 asection
*osec
= o
->output_section
;
11297 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
11298 if (symndx
>= locsymcount
11299 || (elf_bad_symtab (input_bfd
)
11300 && flinfo
->sections
[symndx
] == NULL
))
11302 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
11303 while (h
->root
.type
== bfd_link_hash_indirect
11304 || h
->root
.type
== bfd_link_hash_warning
)
11305 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11306 /* Arrange for symbol to be output. */
11308 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
11310 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
11312 /* We'll use the output section target_index. */
11313 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11314 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
11318 if (flinfo
->indices
[symndx
] == -1)
11320 /* Otherwise output the local symbol now. */
11321 Elf_Internal_Sym sym
= isymbuf
[symndx
];
11322 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11327 name
= bfd_elf_string_from_elf_section (input_bfd
,
11328 symtab_hdr
->sh_link
,
11333 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11335 if (sym
.st_shndx
== SHN_BAD
)
11338 sym
.st_value
+= o
->output_offset
;
11340 indx
= bfd_get_symcount (output_bfd
);
11341 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
11346 flinfo
->indices
[symndx
] = indx
;
11350 elf_section_data (osec
)->this_hdr
.sh_info
11351 = flinfo
->indices
[symndx
];
11355 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11356 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
11359 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
11361 /* Section was created by _bfd_elf_link_create_dynamic_sections
11366 /* Get the contents of the section. They have been cached by a
11367 relaxation routine. Note that o is a section in an input
11368 file, so the contents field will not have been set by any of
11369 the routines which work on output files. */
11370 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
11372 contents
= elf_section_data (o
)->this_hdr
.contents
;
11373 if (bed
->caches_rawsize
11375 && o
->rawsize
< o
->size
)
11377 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
11378 contents
= flinfo
->contents
;
11381 else if (!(o
->flags
& SEC_RELOC
)
11382 && !bed
->elf_backend_write_section
11383 && o
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
11384 /* A MERGE section that has no relocations doesn't need the
11385 contents anymore, they have been recorded earlier. Except
11386 if the backend has special provisions for writing sections. */
11390 contents
= flinfo
->contents
;
11391 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
11395 if ((o
->flags
& SEC_RELOC
) != 0)
11397 Elf_Internal_Rela
*internal_relocs
;
11398 Elf_Internal_Rela
*rel
, *relend
;
11399 int action_discarded
;
11402 /* Get the swapped relocs. */
11404 = _bfd_elf_link_info_read_relocs (input_bfd
, flinfo
->info
, o
,
11405 flinfo
->external_relocs
,
11406 flinfo
->internal_relocs
,
11408 if (internal_relocs
== NULL
11409 && o
->reloc_count
> 0)
11412 action_discarded
= -1;
11413 if (!elf_section_ignore_discarded_relocs (o
))
11414 action_discarded
= (*bed
->action_discarded
) (o
);
11416 /* Run through the relocs evaluating complex reloc symbols and
11417 looking for relocs against symbols from discarded sections
11418 or section symbols from removed link-once sections.
11419 Complain about relocs against discarded sections. Zero
11420 relocs against removed link-once sections. */
11422 rel
= internal_relocs
;
11423 relend
= rel
+ o
->reloc_count
;
11424 for ( ; rel
< relend
; rel
++)
11426 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
11427 unsigned int s_type
;
11428 asection
**ps
, *sec
;
11429 struct elf_link_hash_entry
*h
= NULL
;
11430 const char *sym_name
;
11432 if (r_symndx
== STN_UNDEF
)
11435 if (r_symndx
>= locsymcount
11436 || (elf_bad_symtab (input_bfd
)
11437 && flinfo
->sections
[r_symndx
] == NULL
))
11439 h
= sym_hashes
[r_symndx
- extsymoff
];
11441 /* Badly formatted input files can contain relocs that
11442 reference non-existant symbols. Check here so that
11443 we do not seg fault. */
11447 /* xgettext:c-format */
11448 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
11449 "that references a non-existent global symbol"),
11450 input_bfd
, (uint64_t) rel
->r_info
, o
);
11451 bfd_set_error (bfd_error_bad_value
);
11455 while (h
->root
.type
== bfd_link_hash_indirect
11456 || h
->root
.type
== bfd_link_hash_warning
)
11457 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11461 /* If a plugin symbol is referenced from a non-IR file,
11462 mark the symbol as undefined. Note that the
11463 linker may attach linker created dynamic sections
11464 to the plugin bfd. Symbols defined in linker
11465 created sections are not plugin symbols. */
11466 if ((h
->root
.non_ir_ref_regular
11467 || h
->root
.non_ir_ref_dynamic
)
11468 && (h
->root
.type
== bfd_link_hash_defined
11469 || h
->root
.type
== bfd_link_hash_defweak
)
11470 && (h
->root
.u
.def
.section
->flags
11471 & SEC_LINKER_CREATED
) == 0
11472 && h
->root
.u
.def
.section
->owner
!= NULL
11473 && (h
->root
.u
.def
.section
->owner
->flags
11474 & BFD_PLUGIN
) != 0)
11476 h
->root
.type
= bfd_link_hash_undefined
;
11477 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11481 if (h
->root
.type
== bfd_link_hash_defined
11482 || h
->root
.type
== bfd_link_hash_defweak
)
11483 ps
= &h
->root
.u
.def
.section
;
11485 sym_name
= h
->root
.root
.string
;
11489 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11491 s_type
= ELF_ST_TYPE (sym
->st_info
);
11492 ps
= &flinfo
->sections
[r_symndx
];
11493 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11497 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11498 && !bfd_link_relocatable (flinfo
->info
))
11501 bfd_vma dot
= (rel
->r_offset
11502 + o
->output_offset
+ o
->output_section
->vma
);
11504 printf ("Encountered a complex symbol!");
11505 printf (" (input_bfd %s, section %s, reloc %ld\n",
11506 bfd_get_filename (input_bfd
), o
->name
,
11507 (long) (rel
- internal_relocs
));
11508 printf (" symbol: idx %8.8lx, name %s\n",
11509 r_symndx
, sym_name
);
11510 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11511 (unsigned long) rel
->r_info
,
11512 (unsigned long) rel
->r_offset
);
11514 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11515 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11518 /* Symbol evaluated OK. Update to absolute value. */
11519 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11524 if (action_discarded
!= -1 && ps
!= NULL
)
11526 /* Complain if the definition comes from a
11527 discarded section. */
11528 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11530 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11531 if (action_discarded
& COMPLAIN
)
11532 (*flinfo
->info
->callbacks
->einfo
)
11533 /* xgettext:c-format */
11534 (_("%X`%s' referenced in section `%pA' of %pB: "
11535 "defined in discarded section `%pA' of %pB\n"),
11536 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11538 /* Try to do the best we can to support buggy old
11539 versions of gcc. Pretend that the symbol is
11540 really defined in the kept linkonce section.
11541 FIXME: This is quite broken. Modifying the
11542 symbol here means we will be changing all later
11543 uses of the symbol, not just in this section. */
11544 if (action_discarded
& PRETEND
)
11548 kept
= _bfd_elf_check_kept_section (sec
,
11560 /* Relocate the section by invoking a back end routine.
11562 The back end routine is responsible for adjusting the
11563 section contents as necessary, and (if using Rela relocs
11564 and generating a relocatable output file) adjusting the
11565 reloc addend as necessary.
11567 The back end routine does not have to worry about setting
11568 the reloc address or the reloc symbol index.
11570 The back end routine is given a pointer to the swapped in
11571 internal symbols, and can access the hash table entries
11572 for the external symbols via elf_sym_hashes (input_bfd).
11574 When generating relocatable output, the back end routine
11575 must handle STB_LOCAL/STT_SECTION symbols specially. The
11576 output symbol is going to be a section symbol
11577 corresponding to the output section, which will require
11578 the addend to be adjusted. */
11580 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11581 input_bfd
, o
, contents
,
11589 || bfd_link_relocatable (flinfo
->info
)
11590 || flinfo
->info
->emitrelocations
)
11592 Elf_Internal_Rela
*irela
;
11593 Elf_Internal_Rela
*irelaend
, *irelamid
;
11594 bfd_vma last_offset
;
11595 struct elf_link_hash_entry
**rel_hash
;
11596 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11597 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11598 unsigned int next_erel
;
11600 struct bfd_elf_section_data
*esdi
, *esdo
;
11602 esdi
= elf_section_data (o
);
11603 esdo
= elf_section_data (o
->output_section
);
11604 rela_normal
= false;
11606 /* Adjust the reloc addresses and symbol indices. */
11608 irela
= internal_relocs
;
11609 irelaend
= irela
+ o
->reloc_count
;
11610 rel_hash
= PTR_ADD (esdo
->rel
.hashes
, esdo
->rel
.count
);
11611 /* We start processing the REL relocs, if any. When we reach
11612 IRELAMID in the loop, we switch to the RELA relocs. */
11614 if (esdi
->rel
.hdr
!= NULL
)
11615 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11616 * bed
->s
->int_rels_per_ext_rel
);
11617 rel_hash_list
= rel_hash
;
11618 rela_hash_list
= NULL
;
11619 last_offset
= o
->output_offset
;
11620 if (!bfd_link_relocatable (flinfo
->info
))
11621 last_offset
+= o
->output_section
->vma
;
11622 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11624 unsigned long r_symndx
;
11626 Elf_Internal_Sym sym
;
11628 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11634 if (irela
== irelamid
)
11636 rel_hash
= PTR_ADD (esdo
->rela
.hashes
, esdo
->rela
.count
);
11637 rela_hash_list
= rel_hash
;
11638 rela_normal
= bed
->rela_normal
;
11641 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11644 if (irela
->r_offset
>= (bfd_vma
) -2)
11646 /* This is a reloc for a deleted entry or somesuch.
11647 Turn it into an R_*_NONE reloc, at the same
11648 offset as the last reloc. elf_eh_frame.c and
11649 bfd_elf_discard_info rely on reloc offsets
11651 irela
->r_offset
= last_offset
;
11653 irela
->r_addend
= 0;
11657 irela
->r_offset
+= o
->output_offset
;
11659 /* Relocs in an executable have to be virtual addresses. */
11660 if (!bfd_link_relocatable (flinfo
->info
))
11661 irela
->r_offset
+= o
->output_section
->vma
;
11663 last_offset
= irela
->r_offset
;
11665 r_symndx
= irela
->r_info
>> r_sym_shift
;
11666 if (r_symndx
== STN_UNDEF
)
11669 if (r_symndx
>= locsymcount
11670 || (elf_bad_symtab (input_bfd
)
11671 && flinfo
->sections
[r_symndx
] == NULL
))
11673 struct elf_link_hash_entry
*rh
;
11674 unsigned long indx
;
11676 /* This is a reloc against a global symbol. We
11677 have not yet output all the local symbols, so
11678 we do not know the symbol index of any global
11679 symbol. We set the rel_hash entry for this
11680 reloc to point to the global hash table entry
11681 for this symbol. The symbol index is then
11682 set at the end of bfd_elf_final_link. */
11683 indx
= r_symndx
- extsymoff
;
11684 rh
= elf_sym_hashes (input_bfd
)[indx
];
11685 while (rh
->root
.type
== bfd_link_hash_indirect
11686 || rh
->root
.type
== bfd_link_hash_warning
)
11687 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11689 /* Setting the index to -2 tells
11690 elf_link_output_extsym that this symbol is
11691 used by a reloc. */
11692 BFD_ASSERT (rh
->indx
< 0);
11699 /* This is a reloc against a local symbol. */
11702 sym
= isymbuf
[r_symndx
];
11703 sec
= flinfo
->sections
[r_symndx
];
11704 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11706 /* I suppose the backend ought to fill in the
11707 section of any STT_SECTION symbol against a
11708 processor specific section. */
11709 r_symndx
= STN_UNDEF
;
11710 if (bfd_is_abs_section (sec
))
11712 else if (sec
== NULL
|| sec
->owner
== NULL
)
11714 bfd_set_error (bfd_error_bad_value
);
11719 asection
*osec
= sec
->output_section
;
11721 /* If we have discarded a section, the output
11722 section will be the absolute section. In
11723 case of discarded SEC_MERGE sections, use
11724 the kept section. relocate_section should
11725 have already handled discarded linkonce
11727 if (bfd_is_abs_section (osec
)
11728 && sec
->kept_section
!= NULL
11729 && sec
->kept_section
->output_section
!= NULL
)
11731 osec
= sec
->kept_section
->output_section
;
11732 irela
->r_addend
-= osec
->vma
;
11735 if (!bfd_is_abs_section (osec
))
11737 r_symndx
= osec
->target_index
;
11738 if (r_symndx
== STN_UNDEF
)
11740 irela
->r_addend
+= osec
->vma
;
11741 osec
= _bfd_nearby_section (output_bfd
, osec
,
11743 irela
->r_addend
-= osec
->vma
;
11744 r_symndx
= osec
->target_index
;
11749 /* Adjust the addend according to where the
11750 section winds up in the output section. */
11752 irela
->r_addend
+= sec
->output_offset
;
11756 if (flinfo
->indices
[r_symndx
] == -1)
11758 unsigned long shlink
;
11763 if (flinfo
->info
->strip
== strip_all
)
11765 /* You can't do ld -r -s. */
11766 bfd_set_error (bfd_error_invalid_operation
);
11770 /* This symbol was skipped earlier, but
11771 since it is needed by a reloc, we
11772 must output it now. */
11773 shlink
= symtab_hdr
->sh_link
;
11774 name
= (bfd_elf_string_from_elf_section
11775 (input_bfd
, shlink
, sym
.st_name
));
11779 osec
= sec
->output_section
;
11781 _bfd_elf_section_from_bfd_section (output_bfd
,
11783 if (sym
.st_shndx
== SHN_BAD
)
11786 sym
.st_value
+= sec
->output_offset
;
11787 if (!bfd_link_relocatable (flinfo
->info
))
11789 sym
.st_value
+= osec
->vma
;
11790 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11792 struct elf_link_hash_table
*htab
11793 = elf_hash_table (flinfo
->info
);
11795 /* STT_TLS symbols are relative to PT_TLS
11797 if (htab
->tls_sec
!= NULL
)
11798 sym
.st_value
-= htab
->tls_sec
->vma
;
11801 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11806 indx
= bfd_get_symcount (output_bfd
);
11807 ret
= elf_link_output_symstrtab (flinfo
, name
,
11813 flinfo
->indices
[r_symndx
] = indx
;
11818 r_symndx
= flinfo
->indices
[r_symndx
];
11821 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11822 | (irela
->r_info
& r_type_mask
));
11825 /* Swap out the relocs. */
11826 input_rel_hdr
= esdi
->rel
.hdr
;
11827 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11829 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11834 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11835 * bed
->s
->int_rels_per_ext_rel
);
11836 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11839 input_rela_hdr
= esdi
->rela
.hdr
;
11840 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11842 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11851 /* Write out the modified section contents. */
11852 if (bed
->elf_backend_write_section
11853 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11856 /* Section written out. */
11858 else switch (o
->sec_info_type
)
11860 case SEC_INFO_TYPE_STABS
:
11861 if (! (_bfd_write_section_stabs
11863 &elf_hash_table (flinfo
->info
)->stab_info
,
11864 o
, &elf_section_data (o
)->sec_info
, contents
)))
11867 case SEC_INFO_TYPE_MERGE
:
11868 if (! _bfd_write_merged_section (output_bfd
, o
,
11869 elf_section_data (o
)->sec_info
))
11872 case SEC_INFO_TYPE_EH_FRAME
:
11874 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11879 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11881 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11887 case SEC_INFO_TYPE_SFRAME
:
11889 /* Merge .sframe sections into the ctf frame encoder
11890 context of the output_bfd's section. The final .sframe
11891 output section will be written out later. */
11892 if (!_bfd_elf_merge_section_sframe (output_bfd
, flinfo
->info
,
11899 if (! (o
->flags
& SEC_EXCLUDE
))
11901 file_ptr offset
= (file_ptr
) o
->output_offset
;
11902 bfd_size_type todo
= o
->size
;
11904 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11906 if ((o
->flags
& SEC_ELF_REVERSE_COPY
)
11907 && o
->size
> address_size
)
11909 /* Reverse-copy input section to output. */
11911 if ((o
->size
& (address_size
- 1)) != 0
11912 || (o
->reloc_count
!= 0
11913 && (o
->size
* bed
->s
->int_rels_per_ext_rel
11914 != o
->reloc_count
* address_size
)))
11917 /* xgettext:c-format */
11918 (_("error: %pB: size of section %pA is not "
11919 "multiple of address size"),
11921 bfd_set_error (bfd_error_bad_value
);
11927 todo
-= address_size
;
11928 if (! bfd_set_section_contents (output_bfd
,
11936 offset
+= address_size
;
11940 else if (! bfd_set_section_contents (output_bfd
,
11954 /* Generate a reloc when linking an ELF file. This is a reloc
11955 requested by the linker, and does not come from any input file. This
11956 is used to build constructor and destructor tables when linking
11960 elf_reloc_link_order (bfd
*output_bfd
,
11961 struct bfd_link_info
*info
,
11962 asection
*output_section
,
11963 struct bfd_link_order
*link_order
)
11965 reloc_howto_type
*howto
;
11969 struct bfd_elf_section_reloc_data
*reldata
;
11970 struct elf_link_hash_entry
**rel_hash_ptr
;
11971 Elf_Internal_Shdr
*rel_hdr
;
11972 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11973 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11976 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11978 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11981 bfd_set_error (bfd_error_bad_value
);
11985 addend
= link_order
->u
.reloc
.p
->addend
;
11988 reldata
= &esdo
->rel
;
11989 else if (esdo
->rela
.hdr
)
11990 reldata
= &esdo
->rela
;
11997 /* Figure out the symbol index. */
11998 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11999 if (link_order
->type
== bfd_section_reloc_link_order
)
12001 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
12002 BFD_ASSERT (indx
!= 0);
12003 *rel_hash_ptr
= NULL
;
12007 struct elf_link_hash_entry
*h
;
12009 /* Treat a reloc against a defined symbol as though it were
12010 actually against the section. */
12011 h
= ((struct elf_link_hash_entry
*)
12012 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
12013 link_order
->u
.reloc
.p
->u
.name
,
12014 false, false, true));
12016 && (h
->root
.type
== bfd_link_hash_defined
12017 || h
->root
.type
== bfd_link_hash_defweak
))
12021 section
= h
->root
.u
.def
.section
;
12022 indx
= section
->output_section
->target_index
;
12023 *rel_hash_ptr
= NULL
;
12024 /* It seems that we ought to add the symbol value to the
12025 addend here, but in practice it has already been added
12026 because it was passed to constructor_callback. */
12027 addend
+= section
->output_section
->vma
+ section
->output_offset
;
12029 else if (h
!= NULL
)
12031 /* Setting the index to -2 tells elf_link_output_extsym that
12032 this symbol is used by a reloc. */
12039 (*info
->callbacks
->unattached_reloc
)
12040 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
12045 /* If this is an inplace reloc, we must write the addend into the
12047 if (howto
->partial_inplace
&& addend
!= 0)
12049 bfd_size_type size
;
12050 bfd_reloc_status_type rstat
;
12053 const char *sym_name
;
12054 bfd_size_type octets
;
12056 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
12057 buf
= (bfd_byte
*) bfd_zmalloc (size
);
12058 if (buf
== NULL
&& size
!= 0)
12060 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
12067 case bfd_reloc_outofrange
:
12070 case bfd_reloc_overflow
:
12071 if (link_order
->type
== bfd_section_reloc_link_order
)
12072 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
12074 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
12075 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
12076 howto
->name
, addend
, NULL
, NULL
,
12081 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
12083 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
12090 /* The address of a reloc is relative to the section in a
12091 relocatable file, and is a virtual address in an executable
12093 offset
= link_order
->offset
;
12094 if (! bfd_link_relocatable (info
))
12095 offset
+= output_section
->vma
;
12097 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
12099 irel
[i
].r_offset
= offset
;
12100 irel
[i
].r_info
= 0;
12101 irel
[i
].r_addend
= 0;
12103 if (bed
->s
->arch_size
== 32)
12104 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
12106 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
12108 rel_hdr
= reldata
->hdr
;
12109 erel
= rel_hdr
->contents
;
12110 if (rel_hdr
->sh_type
== SHT_REL
)
12112 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
12113 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
12117 irel
[0].r_addend
= addend
;
12118 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
12119 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
12127 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
12128 Returns TRUE upon success, FALSE otherwise. */
12131 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
12135 const struct elf_backend_data
*bed
;
12137 enum bfd_architecture arch
;
12139 asymbol
**sympp
= NULL
;
12143 elf_symbol_type
*osymbuf
;
12146 implib_bfd
= info
->out_implib_bfd
;
12147 bed
= get_elf_backend_data (abfd
);
12149 if (!bfd_set_format (implib_bfd
, bfd_object
))
12152 /* Use flag from executable but make it a relocatable object. */
12153 flags
= bfd_get_file_flags (abfd
);
12154 flags
&= ~HAS_RELOC
;
12155 if (!bfd_set_start_address (implib_bfd
, 0)
12156 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
12159 /* Copy architecture of output file to import library file. */
12160 arch
= bfd_get_arch (abfd
);
12161 mach
= bfd_get_mach (abfd
);
12162 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
12163 && (abfd
->target_defaulted
12164 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
12167 /* Get symbol table size. */
12168 symsize
= bfd_get_symtab_upper_bound (abfd
);
12172 /* Read in the symbol table. */
12173 sympp
= (asymbol
**) bfd_malloc (symsize
);
12177 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
12181 /* Allow the BFD backend to copy any private header data it
12182 understands from the output BFD to the import library BFD. */
12183 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
12186 /* Filter symbols to appear in the import library. */
12187 if (bed
->elf_backend_filter_implib_symbols
)
12188 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
12191 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
12194 bfd_set_error (bfd_error_no_symbols
);
12195 _bfd_error_handler (_("%pB: no symbol found for import library"),
12201 /* Make symbols absolute. */
12202 amt
= symcount
* sizeof (*osymbuf
);
12203 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
12204 if (osymbuf
== NULL
)
12207 for (src_count
= 0; src_count
< symcount
; src_count
++)
12209 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
12210 sizeof (*osymbuf
));
12211 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
12212 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
12213 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
12214 osymbuf
[src_count
].internal_elf_sym
.st_value
=
12215 osymbuf
[src_count
].symbol
.value
;
12216 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
12219 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
12221 /* Allow the BFD backend to copy any private data it understands
12222 from the output BFD to the import library BFD. This is done last
12223 to permit the routine to look at the filtered symbol table. */
12224 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
12227 if (!bfd_close (implib_bfd
))
12238 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
12242 if (flinfo
->symstrtab
!= NULL
)
12243 _bfd_elf_strtab_free (flinfo
->symstrtab
);
12244 free (flinfo
->contents
);
12245 free (flinfo
->external_relocs
);
12246 free (flinfo
->internal_relocs
);
12247 free (flinfo
->external_syms
);
12248 free (flinfo
->locsym_shndx
);
12249 free (flinfo
->internal_syms
);
12250 free (flinfo
->indices
);
12251 free (flinfo
->sections
);
12252 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
12253 free (flinfo
->symshndxbuf
);
12254 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
12256 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12257 free (esdo
->rel
.hashes
);
12258 free (esdo
->rela
.hashes
);
12262 /* Do the final step of an ELF link. */
12265 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12270 struct elf_final_link_info flinfo
;
12272 struct bfd_link_order
*p
;
12274 bfd_size_type max_contents_size
;
12275 bfd_size_type max_external_reloc_size
;
12276 bfd_size_type max_internal_reloc_count
;
12277 bfd_size_type max_sym_count
;
12278 bfd_size_type max_sym_shndx_count
;
12279 Elf_Internal_Sym elfsym
;
12281 Elf_Internal_Shdr
*symtab_hdr
;
12282 Elf_Internal_Shdr
*symtab_shndx_hdr
;
12283 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12284 struct elf_outext_info eoinfo
;
12286 size_t relativecount
;
12287 size_t relr_entsize
;
12288 asection
*reldyn
= 0;
12290 asection
*attr_section
= NULL
;
12291 bfd_vma attr_size
= 0;
12292 const char *std_attrs_section
;
12293 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
12294 bool sections_removed
;
12297 if (!is_elf_hash_table (&htab
->root
))
12300 if (bfd_link_pic (info
))
12301 abfd
->flags
|= DYNAMIC
;
12303 dynamic
= htab
->dynamic_sections_created
;
12304 dynobj
= htab
->dynobj
;
12306 emit_relocs
= (bfd_link_relocatable (info
)
12307 || info
->emitrelocations
);
12309 memset (&flinfo
, 0, sizeof (flinfo
));
12310 flinfo
.info
= info
;
12311 flinfo
.output_bfd
= abfd
;
12312 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
12313 if (flinfo
.symstrtab
== NULL
)
12318 flinfo
.hash_sec
= NULL
;
12319 flinfo
.symver_sec
= NULL
;
12323 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
12324 /* Note that dynsym_sec can be NULL (on VMS). */
12325 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
12326 /* Note that it is OK if symver_sec is NULL. */
12329 if (info
->unique_symbol
12330 && !bfd_hash_table_init (&flinfo
.local_hash_table
,
12331 local_hash_newfunc
,
12332 sizeof (struct local_hash_entry
)))
12335 /* The object attributes have been merged. Remove the input
12336 sections from the link, and set the contents of the output
12338 sections_removed
= false;
12339 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
12340 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12342 bool remove_section
= false;
12344 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
12345 || strcmp (o
->name
, ".gnu.attributes") == 0)
12347 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12349 asection
*input_section
;
12351 if (p
->type
!= bfd_indirect_link_order
)
12353 input_section
= p
->u
.indirect
.section
;
12354 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12355 elf_link_input_bfd ignores this section. */
12356 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12359 attr_size
= bfd_elf_obj_attr_size (abfd
);
12360 bfd_set_section_size (o
, attr_size
);
12361 /* Skip this section later on. */
12362 o
->map_head
.link_order
= NULL
;
12366 remove_section
= true;
12368 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12370 /* Remove empty group section from linker output. */
12371 remove_section
= true;
12373 if (remove_section
)
12375 o
->flags
|= SEC_EXCLUDE
;
12376 bfd_section_list_remove (abfd
, o
);
12377 abfd
->section_count
--;
12378 sections_removed
= true;
12381 if (sections_removed
)
12382 _bfd_fix_excluded_sec_syms (abfd
, info
);
12384 /* Count up the number of relocations we will output for each output
12385 section, so that we know the sizes of the reloc sections. We
12386 also figure out some maximum sizes. */
12387 max_contents_size
= 0;
12388 max_external_reloc_size
= 0;
12389 max_internal_reloc_count
= 0;
12391 max_sym_shndx_count
= 0;
12393 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12395 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12396 o
->reloc_count
= 0;
12398 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12400 unsigned int reloc_count
= 0;
12401 unsigned int additional_reloc_count
= 0;
12402 struct bfd_elf_section_data
*esdi
= NULL
;
12404 if (p
->type
== bfd_section_reloc_link_order
12405 || p
->type
== bfd_symbol_reloc_link_order
)
12407 else if (p
->type
== bfd_indirect_link_order
)
12411 sec
= p
->u
.indirect
.section
;
12413 /* Mark all sections which are to be included in the
12414 link. This will normally be every section. We need
12415 to do this so that we can identify any sections which
12416 the linker has decided to not include. */
12417 sec
->linker_mark
= true;
12419 if (sec
->flags
& SEC_MERGE
)
12422 if (sec
->rawsize
> max_contents_size
)
12423 max_contents_size
= sec
->rawsize
;
12424 if (sec
->size
> max_contents_size
)
12425 max_contents_size
= sec
->size
;
12427 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12428 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12432 /* We are interested in just local symbols, not all
12434 if (elf_bad_symtab (sec
->owner
))
12435 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12436 / bed
->s
->sizeof_sym
);
12438 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12440 if (sym_count
> max_sym_count
)
12441 max_sym_count
= sym_count
;
12443 if (sym_count
> max_sym_shndx_count
12444 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12445 max_sym_shndx_count
= sym_count
;
12447 esdi
= elf_section_data (sec
);
12449 if (esdi
->this_hdr
.sh_type
== SHT_REL
12450 || esdi
->this_hdr
.sh_type
== SHT_RELA
)
12451 /* Some backends use reloc_count in relocation sections
12452 to count particular types of relocs. Of course,
12453 reloc sections themselves can't have relocations. */
12455 else if (emit_relocs
)
12457 reloc_count
= sec
->reloc_count
;
12458 if (bed
->elf_backend_count_additional_relocs
)
12461 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12462 additional_reloc_count
+= c
;
12465 else if (bed
->elf_backend_count_relocs
)
12466 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12468 if ((sec
->flags
& SEC_RELOC
) != 0)
12470 size_t ext_size
= 0;
12472 if (esdi
->rel
.hdr
!= NULL
)
12473 ext_size
= esdi
->rel
.hdr
->sh_size
;
12474 if (esdi
->rela
.hdr
!= NULL
)
12475 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12477 if (ext_size
> max_external_reloc_size
)
12478 max_external_reloc_size
= ext_size
;
12479 if (sec
->reloc_count
> max_internal_reloc_count
)
12480 max_internal_reloc_count
= sec
->reloc_count
;
12485 if (reloc_count
== 0)
12488 reloc_count
+= additional_reloc_count
;
12489 o
->reloc_count
+= reloc_count
;
12491 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12495 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12496 esdo
->rel
.count
+= additional_reloc_count
;
12498 if (esdi
->rela
.hdr
)
12500 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12501 esdo
->rela
.count
+= additional_reloc_count
;
12507 esdo
->rela
.count
+= reloc_count
;
12509 esdo
->rel
.count
+= reloc_count
;
12513 if (o
->reloc_count
> 0)
12514 o
->flags
|= SEC_RELOC
;
12517 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12518 set it (this is probably a bug) and if it is set
12519 assign_section_numbers will create a reloc section. */
12520 o
->flags
&=~ SEC_RELOC
;
12523 /* If the SEC_ALLOC flag is not set, force the section VMA to
12524 zero. This is done in elf_fake_sections as well, but forcing
12525 the VMA to 0 here will ensure that relocs against these
12526 sections are handled correctly. */
12527 if ((o
->flags
& SEC_ALLOC
) == 0
12528 && ! o
->user_set_vma
)
12532 if (! bfd_link_relocatable (info
) && merged
)
12533 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12535 /* Figure out the file positions for everything but the symbol table
12536 and the relocs. We set symcount to force assign_section_numbers
12537 to create a symbol table. */
12538 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12539 BFD_ASSERT (! abfd
->output_has_begun
);
12540 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12543 /* Set sizes, and assign file positions for reloc sections. */
12544 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12546 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12547 if ((o
->flags
& SEC_RELOC
) != 0)
12550 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12554 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12558 /* _bfd_elf_compute_section_file_positions makes temporary use
12559 of target_index. Reset it. */
12560 o
->target_index
= 0;
12562 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12563 to count upwards while actually outputting the relocations. */
12564 esdo
->rel
.count
= 0;
12565 esdo
->rela
.count
= 0;
12567 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12568 && !bfd_section_is_ctf (o
))
12570 /* Cache the section contents so that they can be compressed
12571 later. Use bfd_malloc since it will be freed by
12572 bfd_compress_section_contents. */
12573 unsigned char *contents
= esdo
->this_hdr
.contents
;
12574 if (contents
!= NULL
)
12577 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12578 if (contents
== NULL
)
12580 esdo
->this_hdr
.contents
= contents
;
12584 /* We have now assigned file positions for all the sections except .symtab,
12585 .strtab, and non-loaded reloc and compressed debugging sections. We start
12586 the .symtab section at the current file position, and write directly to it.
12587 We build the .strtab section in memory. */
12588 abfd
->symcount
= 0;
12589 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12590 /* sh_name is set in prep_headers. */
12591 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12592 /* sh_flags, sh_addr and sh_size all start off zero. */
12593 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12594 /* sh_link is set in assign_section_numbers. */
12595 /* sh_info is set below. */
12596 /* sh_offset is set just below. */
12597 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12599 if (max_sym_count
< 20)
12600 max_sym_count
= 20;
12601 htab
->strtabsize
= max_sym_count
;
12602 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12603 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12604 if (htab
->strtab
== NULL
)
12606 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12608 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12609 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12611 if (info
->strip
!= strip_all
|| emit_relocs
)
12613 file_ptr off
= elf_next_file_pos (abfd
);
12615 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
12617 /* Note that at this point elf_next_file_pos (abfd) is
12618 incorrect. We do not yet know the size of the .symtab section.
12619 We correct next_file_pos below, after we do know the size. */
12621 /* Start writing out the symbol table. The first symbol is always a
12623 elfsym
.st_value
= 0;
12624 elfsym
.st_size
= 0;
12625 elfsym
.st_info
= 0;
12626 elfsym
.st_other
= 0;
12627 elfsym
.st_shndx
= SHN_UNDEF
;
12628 elfsym
.st_target_internal
= 0;
12629 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12630 bfd_und_section_ptr
, NULL
) != 1)
12633 /* Output a symbol for each section if asked or they are used for
12634 relocs. These symbols usually have no names. We store the
12635 index of each one in the index field of the section, so that
12636 we can find it again when outputting relocs. */
12638 if (bfd_keep_unused_section_symbols (abfd
) || emit_relocs
)
12640 bool name_local_sections
12641 = (bed
->elf_backend_name_local_section_symbols
12642 && bed
->elf_backend_name_local_section_symbols (abfd
));
12643 const char *name
= NULL
;
12645 elfsym
.st_size
= 0;
12646 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12647 elfsym
.st_other
= 0;
12648 elfsym
.st_value
= 0;
12649 elfsym
.st_target_internal
= 0;
12650 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12652 o
= bfd_section_from_elf_index (abfd
, i
);
12655 o
->target_index
= bfd_get_symcount (abfd
);
12656 elfsym
.st_shndx
= i
;
12657 if (!bfd_link_relocatable (info
))
12658 elfsym
.st_value
= o
->vma
;
12659 if (name_local_sections
)
12661 if (elf_link_output_symstrtab (&flinfo
, name
, &elfsym
, o
,
12669 /* On some targets like Irix 5 the symbol split between local and global
12670 ones recorded in the sh_info field needs to be done between section
12671 and all other symbols. */
12672 if (bed
->elf_backend_elfsym_local_is_section
12673 && bed
->elf_backend_elfsym_local_is_section (abfd
))
12674 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12676 /* Allocate some memory to hold information read in from the input
12678 if (max_contents_size
!= 0)
12680 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12681 if (flinfo
.contents
== NULL
)
12685 if (max_external_reloc_size
!= 0)
12687 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12688 if (flinfo
.external_relocs
== NULL
)
12692 if (max_internal_reloc_count
!= 0)
12694 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12695 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12696 if (flinfo
.internal_relocs
== NULL
)
12700 if (max_sym_count
!= 0)
12702 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12703 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12704 if (flinfo
.external_syms
== NULL
)
12707 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12708 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12709 if (flinfo
.internal_syms
== NULL
)
12712 amt
= max_sym_count
* sizeof (long);
12713 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12714 if (flinfo
.indices
== NULL
)
12717 amt
= max_sym_count
* sizeof (asection
*);
12718 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12719 if (flinfo
.sections
== NULL
)
12723 if (max_sym_shndx_count
!= 0)
12725 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12726 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12727 if (flinfo
.locsym_shndx
== NULL
)
12733 bfd_vma base
, end
= 0; /* Both bytes. */
12736 for (sec
= htab
->tls_sec
;
12737 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12740 bfd_size_type size
= sec
->size
;
12741 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12744 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12746 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12749 size
= ord
->offset
* opb
+ ord
->size
;
12751 end
= sec
->vma
+ size
/ opb
;
12753 base
= htab
->tls_sec
->vma
;
12754 /* Only align end of TLS section if static TLS doesn't have special
12755 alignment requirements. */
12756 if (bed
->static_tls_alignment
== 1)
12757 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12758 htab
->tls_size
= end
- base
;
12761 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12764 /* Finish relative relocations here after regular symbol processing
12765 is finished if DT_RELR is enabled. */
12766 if (info
->enable_dt_relr
12767 && bed
->finish_relative_relocs
12768 && !bed
->finish_relative_relocs (info
))
12769 info
->callbacks
->einfo
12770 (_("%F%P: %pB: failed to finish relative relocations\n"), abfd
);
12772 /* Since ELF permits relocations to be against local symbols, we
12773 must have the local symbols available when we do the relocations.
12774 Since we would rather only read the local symbols once, and we
12775 would rather not keep them in memory, we handle all the
12776 relocations for a single input file at the same time.
12778 Unfortunately, there is no way to know the total number of local
12779 symbols until we have seen all of them, and the local symbol
12780 indices precede the global symbol indices. This means that when
12781 we are generating relocatable output, and we see a reloc against
12782 a global symbol, we can not know the symbol index until we have
12783 finished examining all the local symbols to see which ones we are
12784 going to output. To deal with this, we keep the relocations in
12785 memory, and don't output them until the end of the link. This is
12786 an unfortunate waste of memory, but I don't see a good way around
12787 it. Fortunately, it only happens when performing a relocatable
12788 link, which is not the common case. FIXME: If keep_memory is set
12789 we could write the relocs out and then read them again; I don't
12790 know how bad the memory loss will be. */
12792 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12793 sub
->output_has_begun
= false;
12794 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12796 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12798 if (p
->type
== bfd_indirect_link_order
12799 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12800 == bfd_target_elf_flavour
)
12801 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12803 if (! sub
->output_has_begun
)
12805 if (! elf_link_input_bfd (&flinfo
, sub
))
12807 sub
->output_has_begun
= true;
12810 else if (p
->type
== bfd_section_reloc_link_order
12811 || p
->type
== bfd_symbol_reloc_link_order
)
12813 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12818 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12820 if (p
->type
== bfd_indirect_link_order
12821 && (bfd_get_flavour (sub
)
12822 == bfd_target_elf_flavour
)
12823 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12824 != bed
->s
->elfclass
))
12826 const char *iclass
, *oclass
;
12828 switch (bed
->s
->elfclass
)
12830 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12831 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12832 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12836 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12838 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12839 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12840 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12844 bfd_set_error (bfd_error_wrong_format
);
12846 /* xgettext:c-format */
12847 (_("%pB: file class %s incompatible with %s"),
12848 sub
, iclass
, oclass
);
12857 /* Free symbol buffer if needed. */
12858 if (!info
->reduce_memory_overheads
)
12860 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12861 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12863 free (elf_tdata (sub
)->symbuf
);
12864 elf_tdata (sub
)->symbuf
= NULL
;
12870 /* Output any global symbols that got converted to local in a
12871 version script or due to symbol visibility. We do this in a
12872 separate step since ELF requires all local symbols to appear
12873 prior to any global symbols. FIXME: We should only do this if
12874 some global symbols were, in fact, converted to become local.
12875 FIXME: Will this work correctly with the Irix 5 linker? */
12876 eoinfo
.failed
= false;
12877 eoinfo
.flinfo
= &flinfo
;
12878 eoinfo
.localsyms
= true;
12879 eoinfo
.file_sym_done
= false;
12880 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12884 goto return_local_hash_table
;
12887 /* If backend needs to output some local symbols not present in the hash
12888 table, do it now. */
12889 if (bed
->elf_backend_output_arch_local_syms
)
12891 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12892 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
12895 goto return_local_hash_table
;
12899 /* That wrote out all the local symbols. Finish up the symbol table
12900 with the global symbols. Even if we want to strip everything we
12901 can, we still need to deal with those global symbols that got
12902 converted to local in a version script. */
12904 /* The sh_info field records the index of the first non local symbol. */
12905 if (!symtab_hdr
->sh_info
)
12906 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12909 && htab
->dynsym
!= NULL
12910 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12912 Elf_Internal_Sym sym
;
12913 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12915 o
= htab
->dynsym
->output_section
;
12916 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12918 /* Write out the section symbols for the output sections. */
12919 if (bfd_link_pic (info
)
12920 || htab
->is_relocatable_executable
)
12926 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12928 sym
.st_target_internal
= 0;
12930 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12936 dynindx
= elf_section_data (s
)->dynindx
;
12939 indx
= elf_section_data (s
)->this_idx
;
12940 BFD_ASSERT (indx
> 0);
12941 sym
.st_shndx
= indx
;
12942 if (! check_dynsym (abfd
, &sym
))
12945 goto return_local_hash_table
;
12947 sym
.st_value
= s
->vma
;
12948 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12950 /* Inform the linker of the addition of this symbol. */
12952 if (info
->callbacks
->ctf_new_dynsym
)
12953 info
->callbacks
->ctf_new_dynsym (dynindx
, &sym
);
12955 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12959 /* Write out the local dynsyms. */
12960 if (htab
->dynlocal
)
12962 struct elf_link_local_dynamic_entry
*e
;
12963 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12968 /* Copy the internal symbol and turn off visibility.
12969 Note that we saved a word of storage and overwrote
12970 the original st_name with the dynstr_index. */
12972 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12973 sym
.st_shndx
= SHN_UNDEF
;
12975 s
= bfd_section_from_elf_index (e
->input_bfd
,
12978 && s
->output_section
!= NULL
12979 && elf_section_data (s
->output_section
) != NULL
)
12982 elf_section_data (s
->output_section
)->this_idx
;
12983 if (! check_dynsym (abfd
, &sym
))
12986 goto return_local_hash_table
;
12988 sym
.st_value
= (s
->output_section
->vma
12990 + e
->isym
.st_value
);
12993 /* Inform the linker of the addition of this symbol. */
12995 if (info
->callbacks
->ctf_new_dynsym
)
12996 info
->callbacks
->ctf_new_dynsym (e
->dynindx
, &sym
);
12998 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12999 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
13004 /* We get the global symbols from the hash table. */
13005 eoinfo
.failed
= false;
13006 eoinfo
.localsyms
= false;
13007 eoinfo
.flinfo
= &flinfo
;
13008 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
13012 goto return_local_hash_table
;
13015 /* If backend needs to output some symbols not present in the hash
13016 table, do it now. */
13017 if (bed
->elf_backend_output_arch_syms
13018 && (info
->strip
!= strip_all
|| emit_relocs
))
13020 if (! ((*bed
->elf_backend_output_arch_syms
)
13021 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
13024 goto return_local_hash_table
;
13028 /* Finalize the .strtab section. */
13029 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
13031 /* Swap out the .strtab section. */
13032 if (!elf_link_swap_symbols_out (&flinfo
))
13035 goto return_local_hash_table
;
13038 /* Now we know the size of the symtab section. */
13039 if (bfd_get_symcount (abfd
) > 0)
13041 /* Finish up and write out the symbol string table (.strtab)
13043 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
13044 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
13046 if (elf_symtab_shndx_list (abfd
))
13048 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
13050 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
13052 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
13053 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
13054 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
13055 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
13056 symtab_shndx_hdr
->sh_size
= amt
;
13058 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
13061 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
13062 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
13065 goto return_local_hash_table
;
13070 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
13071 /* sh_name was set in prep_headers. */
13072 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
13073 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
13074 symstrtab_hdr
->sh_addr
= 0;
13075 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
13076 symstrtab_hdr
->sh_entsize
= 0;
13077 symstrtab_hdr
->sh_link
= 0;
13078 symstrtab_hdr
->sh_info
= 0;
13079 /* sh_offset is set just below. */
13080 symstrtab_hdr
->sh_addralign
= 1;
13082 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
13084 elf_next_file_pos (abfd
) = off
;
13086 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
13087 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
13090 goto return_local_hash_table
;
13094 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
13096 _bfd_error_handler (_("%pB: failed to generate import library"),
13097 info
->out_implib_bfd
);
13099 goto return_local_hash_table
;
13102 /* Adjust the relocs to have the correct symbol indices. */
13103 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
13105 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
13108 if ((o
->flags
& SEC_RELOC
) == 0)
13111 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
13112 if (esdo
->rel
.hdr
!= NULL
13113 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
13116 goto return_local_hash_table
;
13118 if (esdo
->rela
.hdr
!= NULL
13119 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
13122 goto return_local_hash_table
;
13125 /* Set the reloc_count field to 0 to prevent write_relocs from
13126 trying to swap the relocs out itself. */
13127 o
->reloc_count
= 0;
13131 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
13132 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
13135 if (htab
->srelrdyn
!= NULL
13136 && htab
->srelrdyn
->output_section
!= NULL
13137 && htab
->srelrdyn
->size
!= 0)
13139 asection
*s
= htab
->srelrdyn
->output_section
;
13140 relr_entsize
= elf_section_data (s
)->this_hdr
.sh_entsize
;
13141 if (relr_entsize
== 0)
13143 relr_entsize
= bed
->s
->arch_size
/ 8;
13144 elf_section_data (s
)->this_hdr
.sh_entsize
= relr_entsize
;
13148 /* If we are linking against a dynamic object, or generating a
13149 shared library, finish up the dynamic linking information. */
13152 bfd_byte
*dyncon
, *dynconend
;
13154 /* Fix up .dynamic entries. */
13155 o
= bfd_get_linker_section (dynobj
, ".dynamic");
13156 BFD_ASSERT (o
!= NULL
);
13158 dyncon
= o
->contents
;
13159 dynconend
= PTR_ADD (o
->contents
, o
->size
);
13160 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13162 Elf_Internal_Dyn dyn
;
13165 bfd_size_type sh_size
;
13168 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13175 if (relativecount
!= 0)
13177 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
13179 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
13180 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
13182 if (dyn
.d_tag
!= DT_NULL
13183 && dynconend
- dyncon
>= bed
->s
->sizeof_dyn
)
13185 dyn
.d_un
.d_val
= relativecount
;
13191 if (relr_entsize
!= 0)
13193 if (dynconend
- dyncon
>= 3 * bed
->s
->sizeof_dyn
)
13195 asection
*s
= htab
->srelrdyn
;
13196 dyn
.d_tag
= DT_RELR
;
13198 = s
->output_section
->vma
+ s
->output_offset
;
13199 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13200 dyncon
+= bed
->s
->sizeof_dyn
;
13202 dyn
.d_tag
= DT_RELRSZ
;
13203 dyn
.d_un
.d_val
= s
->size
;
13204 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13205 dyncon
+= bed
->s
->sizeof_dyn
;
13207 dyn
.d_tag
= DT_RELRENT
;
13208 dyn
.d_un
.d_val
= relr_entsize
;
13217 name
= info
->init_function
;
13220 name
= info
->fini_function
;
13223 struct elf_link_hash_entry
*h
;
13225 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
13227 && (h
->root
.type
== bfd_link_hash_defined
13228 || h
->root
.type
== bfd_link_hash_defweak
))
13230 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
13231 o
= h
->root
.u
.def
.section
;
13232 if (o
->output_section
!= NULL
)
13233 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
13234 + o
->output_offset
);
13237 /* The symbol is imported from another shared
13238 library and does not apply to this one. */
13239 dyn
.d_un
.d_ptr
= 0;
13246 case DT_PREINIT_ARRAYSZ
:
13247 name
= ".preinit_array";
13249 case DT_INIT_ARRAYSZ
:
13250 name
= ".init_array";
13252 case DT_FINI_ARRAYSZ
:
13253 name
= ".fini_array";
13255 o
= bfd_get_section_by_name (abfd
, name
);
13259 (_("could not find section %s"), name
);
13264 (_("warning: %s section has zero size"), name
);
13265 dyn
.d_un
.d_val
= o
->size
;
13268 case DT_PREINIT_ARRAY
:
13269 name
= ".preinit_array";
13271 case DT_INIT_ARRAY
:
13272 name
= ".init_array";
13274 case DT_FINI_ARRAY
:
13275 name
= ".fini_array";
13277 o
= bfd_get_section_by_name (abfd
, name
);
13284 name
= ".gnu.hash";
13293 name
= ".gnu.version_d";
13296 name
= ".gnu.version_r";
13299 name
= ".gnu.version";
13301 o
= bfd_get_linker_section (dynobj
, name
);
13303 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
13306 (_("could not find section %s"), name
);
13309 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
13312 (_("warning: section '%s' is being made into a note"), name
);
13313 bfd_set_error (bfd_error_nonrepresentable_section
);
13316 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
13323 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
13329 for (i
= 1; i
< elf_numsections (abfd
); i
++)
13331 Elf_Internal_Shdr
*hdr
;
13333 hdr
= elf_elfsections (abfd
)[i
];
13334 if (hdr
->sh_type
== type
13335 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
13337 sh_size
+= hdr
->sh_size
;
13339 || sh_addr
> hdr
->sh_addr
)
13340 sh_addr
= hdr
->sh_addr
;
13344 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
13346 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
13348 /* Don't count procedure linkage table relocs in the
13349 overall reloc count. */
13350 sh_size
-= htab
->srelplt
->size
;
13352 /* If the size is zero, make the address zero too.
13353 This is to avoid a glibc bug. If the backend
13354 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
13355 zero, then we'll put DT_RELA at the end of
13356 DT_JMPREL. glibc will interpret the end of
13357 DT_RELA matching the end of DT_JMPREL as the
13358 case where DT_RELA includes DT_JMPREL, and for
13359 LD_BIND_NOW will decide that processing DT_RELA
13360 will process the PLT relocs too. Net result:
13361 No PLT relocs applied. */
13364 /* If .rela.plt is the first .rela section, exclude
13365 it from DT_RELA. */
13366 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
13367 + htab
->srelplt
->output_offset
) * opb
)
13368 sh_addr
+= htab
->srelplt
->size
;
13371 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
13372 dyn
.d_un
.d_val
= sh_size
;
13374 dyn
.d_un
.d_ptr
= sh_addr
;
13377 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13381 /* If we have created any dynamic sections, then output them. */
13382 if (dynobj
!= NULL
)
13384 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
13387 /* Check for DT_TEXTREL (late, in case the backend removes it). */
13388 if (bfd_link_textrel_check (info
)
13389 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
13392 bfd_byte
*dyncon
, *dynconend
;
13394 dyncon
= o
->contents
;
13395 dynconend
= o
->contents
+ o
->size
;
13396 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13398 Elf_Internal_Dyn dyn
;
13400 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13402 if (dyn
.d_tag
== DT_TEXTREL
)
13404 if (info
->textrel_check
== textrel_check_error
)
13405 info
->callbacks
->einfo
13406 (_("%P%X: read-only segment has dynamic relocations\n"));
13407 else if (bfd_link_dll (info
))
13408 info
->callbacks
->einfo
13409 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
13410 else if (bfd_link_pde (info
))
13411 info
->callbacks
->einfo
13412 (_("%P: warning: creating DT_TEXTREL in a PDE\n"));
13414 info
->callbacks
->einfo
13415 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
13421 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
13423 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
13425 || o
->output_section
== bfd_abs_section_ptr
)
13427 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
13429 /* At this point, we are only interested in sections
13430 created by _bfd_elf_link_create_dynamic_sections. */
13433 if (htab
->stab_info
.stabstr
== o
)
13435 if (htab
->eh_info
.hdr_sec
== o
)
13437 if (strcmp (o
->name
, ".dynstr") != 0)
13439 bfd_size_type octets
= ((file_ptr
) o
->output_offset
13440 * bfd_octets_per_byte (abfd
, o
));
13441 if (!bfd_set_section_contents (abfd
, o
->output_section
,
13442 o
->contents
, octets
, o
->size
))
13447 /* The contents of the .dynstr section are actually in a
13451 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
13452 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
13453 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13459 if (!info
->resolve_section_groups
)
13461 bool failed
= false;
13463 BFD_ASSERT (bfd_link_relocatable (info
));
13464 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13469 /* If we have optimized stabs strings, output them. */
13470 if (htab
->stab_info
.stabstr
!= NULL
)
13472 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13476 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13479 if (! _bfd_elf_write_section_sframe (abfd
, info
))
13482 if (info
->callbacks
->emit_ctf
)
13483 info
->callbacks
->emit_ctf ();
13485 elf_final_link_free (abfd
, &flinfo
);
13489 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13490 if (contents
== NULL
)
13492 /* Bail out and fail. */
13494 goto return_local_hash_table
;
13496 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13497 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13501 return_local_hash_table
:
13502 if (info
->unique_symbol
)
13503 bfd_hash_table_free (&flinfo
.local_hash_table
);
13507 elf_final_link_free (abfd
, &flinfo
);
13509 goto return_local_hash_table
;
13512 /* Initialize COOKIE for input bfd ABFD. */
13515 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13516 struct bfd_link_info
*info
, bfd
*abfd
)
13518 Elf_Internal_Shdr
*symtab_hdr
;
13519 const struct elf_backend_data
*bed
;
13521 bed
= get_elf_backend_data (abfd
);
13522 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13524 cookie
->abfd
= abfd
;
13525 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13526 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13527 if (cookie
->bad_symtab
)
13529 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13530 cookie
->extsymoff
= 0;
13534 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13535 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13538 if (bed
->s
->arch_size
== 32)
13539 cookie
->r_sym_shift
= 8;
13541 cookie
->r_sym_shift
= 32;
13543 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13544 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13546 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13547 cookie
->locsymcount
, 0,
13549 if (cookie
->locsyms
== NULL
)
13551 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13554 if (_bfd_link_keep_memory (info
) )
13556 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13557 info
->cache_size
+= (cookie
->locsymcount
13558 * sizeof (Elf_External_Sym_Shndx
));
13564 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13567 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13569 Elf_Internal_Shdr
*symtab_hdr
;
13571 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13572 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13573 free (cookie
->locsyms
);
13576 /* Initialize the relocation information in COOKIE for input section SEC
13577 of input bfd ABFD. */
13580 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13581 struct bfd_link_info
*info
, bfd
*abfd
,
13584 if (sec
->reloc_count
== 0)
13586 cookie
->rels
= NULL
;
13587 cookie
->relend
= NULL
;
13591 cookie
->rels
= _bfd_elf_link_info_read_relocs (abfd
, info
, sec
,
13593 _bfd_link_keep_memory (info
));
13594 if (cookie
->rels
== NULL
)
13596 cookie
->rel
= cookie
->rels
;
13597 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13599 cookie
->rel
= cookie
->rels
;
13603 /* Free the memory allocated by init_reloc_cookie_rels,
13607 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13610 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13611 free (cookie
->rels
);
13614 /* Initialize the whole of COOKIE for input section SEC. */
13617 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13618 struct bfd_link_info
*info
,
13621 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13623 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13628 fini_reloc_cookie (cookie
, sec
->owner
);
13633 /* Free the memory allocated by init_reloc_cookie_for_section,
13637 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13640 fini_reloc_cookie_rels (cookie
, sec
);
13641 fini_reloc_cookie (cookie
, sec
->owner
);
13644 /* Garbage collect unused sections. */
13646 /* Default gc_mark_hook. */
13649 _bfd_elf_gc_mark_hook (asection
*sec
,
13650 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13651 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13652 struct elf_link_hash_entry
*h
,
13653 Elf_Internal_Sym
*sym
)
13657 switch (h
->root
.type
)
13659 case bfd_link_hash_defined
:
13660 case bfd_link_hash_defweak
:
13661 return h
->root
.u
.def
.section
;
13663 case bfd_link_hash_common
:
13664 return h
->root
.u
.c
.p
->section
;
13671 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13676 /* Return the debug definition section. */
13679 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13680 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13681 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13682 struct elf_link_hash_entry
*h
,
13683 Elf_Internal_Sym
*sym
)
13687 /* Return the global debug definition section. */
13688 if ((h
->root
.type
== bfd_link_hash_defined
13689 || h
->root
.type
== bfd_link_hash_defweak
)
13690 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13691 return h
->root
.u
.def
.section
;
13695 /* Return the local debug definition section. */
13696 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13698 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13705 /* COOKIE->rel describes a relocation against section SEC, which is
13706 a section we've decided to keep. Return the section that contains
13707 the relocation symbol, or NULL if no section contains it. */
13710 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13711 elf_gc_mark_hook_fn gc_mark_hook
,
13712 struct elf_reloc_cookie
*cookie
,
13715 unsigned long r_symndx
;
13716 struct elf_link_hash_entry
*h
, *hw
;
13718 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13719 if (r_symndx
== STN_UNDEF
)
13722 if (r_symndx
>= cookie
->locsymcount
13723 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13727 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13730 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13734 while (h
->root
.type
== bfd_link_hash_indirect
13735 || h
->root
.type
== bfd_link_hash_warning
)
13736 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13738 was_marked
= h
->mark
;
13740 /* Keep all aliases of the symbol too. If an object symbol
13741 needs to be copied into .dynbss then all of its aliases
13742 should be present as dynamic symbols, not just the one used
13743 on the copy relocation. */
13745 while (hw
->is_weakalias
)
13751 if (!was_marked
&& h
->start_stop
&& !h
->root
.ldscript_def
)
13753 if (info
->start_stop_gc
)
13756 /* To work around a glibc bug, mark XXX input sections
13757 when there is a reference to __start_XXX or __stop_XXX
13759 else if (start_stop
!= NULL
)
13761 asection
*s
= h
->u2
.start_stop_section
;
13762 *start_stop
= true;
13767 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13770 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13771 &cookie
->locsyms
[r_symndx
]);
13774 /* COOKIE->rel describes a relocation against section SEC, which is
13775 a section we've decided to keep. Mark the section that contains
13776 the relocation symbol. */
13779 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13781 elf_gc_mark_hook_fn gc_mark_hook
,
13782 struct elf_reloc_cookie
*cookie
)
13785 bool start_stop
= false;
13787 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13788 while (rsec
!= NULL
)
13790 if (!rsec
->gc_mark
)
13792 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13793 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13795 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13800 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13805 /* The mark phase of garbage collection. For a given section, mark
13806 it and any sections in this section's group, and all the sections
13807 which define symbols to which it refers. */
13810 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13812 elf_gc_mark_hook_fn gc_mark_hook
)
13815 asection
*group_sec
, *eh_frame
;
13819 /* Mark all the sections in the group. */
13820 group_sec
= elf_section_data (sec
)->next_in_group
;
13821 if (group_sec
&& !group_sec
->gc_mark
)
13822 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13825 /* Look through the section relocs. */
13827 eh_frame
= elf_eh_frame_section (sec
->owner
);
13828 if ((sec
->flags
& SEC_RELOC
) != 0
13829 && sec
->reloc_count
> 0
13830 && sec
!= eh_frame
)
13832 struct elf_reloc_cookie cookie
;
13834 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13838 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13839 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13844 fini_reloc_cookie_for_section (&cookie
, sec
);
13848 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13850 struct elf_reloc_cookie cookie
;
13852 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13856 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13857 gc_mark_hook
, &cookie
))
13859 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13863 eh_frame
= elf_section_eh_frame_entry (sec
);
13864 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13865 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13871 /* Scan and mark sections in a special or debug section group. */
13874 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13876 /* Point to first section of section group. */
13878 /* Used to iterate the section group. */
13881 bool is_special_grp
= true;
13882 bool is_debug_grp
= true;
13884 /* First scan to see if group contains any section other than debug
13885 and special section. */
13886 ssec
= msec
= elf_next_in_group (grp
);
13889 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13890 is_debug_grp
= false;
13892 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13893 is_special_grp
= false;
13895 msec
= elf_next_in_group (msec
);
13897 while (msec
!= ssec
);
13899 /* If this is a pure debug section group or pure special section group,
13900 keep all sections in this group. */
13901 if (is_debug_grp
|| is_special_grp
)
13906 msec
= elf_next_in_group (msec
);
13908 while (msec
!= ssec
);
13912 /* Keep debug and special sections. */
13915 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13916 elf_gc_mark_hook_fn mark_hook
)
13920 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13924 bool debug_frag_seen
;
13925 bool has_kept_debug_info
;
13927 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13929 isec
= ibfd
->sections
;
13930 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13933 /* Ensure all linker created sections are kept,
13934 see if any other section is already marked,
13935 and note if we have any fragmented debug sections. */
13936 debug_frag_seen
= some_kept
= has_kept_debug_info
= false;
13937 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13939 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13941 else if (isec
->gc_mark
13942 && (isec
->flags
& SEC_ALLOC
) != 0
13943 && elf_section_type (isec
) != SHT_NOTE
)
13947 /* Since all sections, except for backend specific ones,
13948 have been garbage collected, call mark_hook on this
13949 section if any of its linked-to sections is marked. */
13950 asection
*linked_to_sec
;
13951 for (linked_to_sec
= elf_linked_to_section (isec
);
13952 linked_to_sec
!= NULL
&& !linked_to_sec
->linker_mark
;
13953 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13955 if (linked_to_sec
->gc_mark
)
13957 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13961 linked_to_sec
->linker_mark
= 1;
13963 for (linked_to_sec
= elf_linked_to_section (isec
);
13964 linked_to_sec
!= NULL
&& linked_to_sec
->linker_mark
;
13965 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13966 linked_to_sec
->linker_mark
= 0;
13969 if (!debug_frag_seen
13970 && (isec
->flags
& SEC_DEBUGGING
)
13971 && startswith (isec
->name
, ".debug_line."))
13972 debug_frag_seen
= true;
13973 else if (strcmp (bfd_section_name (isec
),
13974 "__patchable_function_entries") == 0
13975 && elf_linked_to_section (isec
) == NULL
)
13976 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13977 "need linked-to section "
13978 "for --gc-sections\n"),
13979 isec
->owner
, isec
);
13982 /* If no non-note alloc section in this file will be kept, then
13983 we can toss out the debug and special sections. */
13987 /* Keep debug and special sections like .comment when they are
13988 not part of a group. Also keep section groups that contain
13989 just debug sections or special sections. NB: Sections with
13990 linked-to section has been handled above. */
13991 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13993 if ((isec
->flags
& SEC_GROUP
) != 0)
13994 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13995 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13996 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13997 && elf_next_in_group (isec
) == NULL
13998 && elf_linked_to_section (isec
) == NULL
)
14000 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
14001 has_kept_debug_info
= true;
14004 /* Look for CODE sections which are going to be discarded,
14005 and find and discard any fragmented debug sections which
14006 are associated with that code section. */
14007 if (debug_frag_seen
)
14008 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
14009 if ((isec
->flags
& SEC_CODE
) != 0
14010 && isec
->gc_mark
== 0)
14015 ilen
= strlen (isec
->name
);
14017 /* Association is determined by the name of the debug
14018 section containing the name of the code section as
14019 a suffix. For example .debug_line.text.foo is a
14020 debug section associated with .text.foo. */
14021 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
14025 if (dsec
->gc_mark
== 0
14026 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
14029 dlen
= strlen (dsec
->name
);
14032 && strncmp (dsec
->name
+ (dlen
- ilen
),
14033 isec
->name
, ilen
) == 0)
14038 /* Mark debug sections referenced by kept debug sections. */
14039 if (has_kept_debug_info
)
14040 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
14042 && (isec
->flags
& SEC_DEBUGGING
) != 0)
14043 if (!_bfd_elf_gc_mark (info
, isec
,
14044 elf_gc_mark_debug_section
))
14051 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
14054 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14056 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14060 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14061 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
14062 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14065 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14068 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14070 /* When any section in a section group is kept, we keep all
14071 sections in the section group. If the first member of
14072 the section group is excluded, we will also exclude the
14074 if (o
->flags
& SEC_GROUP
)
14076 asection
*first
= elf_next_in_group (o
);
14077 o
->gc_mark
= first
->gc_mark
;
14083 /* Skip sweeping sections already excluded. */
14084 if (o
->flags
& SEC_EXCLUDE
)
14087 /* Since this is early in the link process, it is simple
14088 to remove a section from the output. */
14089 o
->flags
|= SEC_EXCLUDE
;
14091 if (info
->print_gc_sections
&& o
->size
!= 0)
14092 /* xgettext:c-format */
14093 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
14101 /* Propagate collected vtable information. This is called through
14102 elf_link_hash_traverse. */
14105 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
14107 /* Those that are not vtables. */
14109 || h
->u2
.vtable
== NULL
14110 || h
->u2
.vtable
->parent
== NULL
)
14113 /* Those vtables that do not have parents, we cannot merge. */
14114 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
14117 /* If we've already been done, exit. */
14118 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
14121 /* Make sure the parent's table is up to date. */
14122 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
14124 if (h
->u2
.vtable
->used
== NULL
)
14126 /* None of this table's entries were referenced. Re-use the
14128 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
14129 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
14136 /* Or the parent's entries into ours. */
14137 cu
= h
->u2
.vtable
->used
;
14139 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
14142 const struct elf_backend_data
*bed
;
14143 unsigned int log_file_align
;
14145 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
14146 log_file_align
= bed
->s
->log_file_align
;
14147 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
14161 struct link_info_ok
14163 struct bfd_link_info
*info
;
14168 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
,
14172 bfd_vma hstart
, hend
;
14173 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
14174 const struct elf_backend_data
*bed
;
14175 unsigned int log_file_align
;
14176 struct link_info_ok
*info
= (struct link_info_ok
*) ptr
;
14178 /* Take care of both those symbols that do not describe vtables as
14179 well as those that are not loaded. */
14181 || h
->u2
.vtable
== NULL
14182 || h
->u2
.vtable
->parent
== NULL
)
14185 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
14186 || h
->root
.type
== bfd_link_hash_defweak
);
14188 sec
= h
->root
.u
.def
.section
;
14189 hstart
= h
->root
.u
.def
.value
;
14190 hend
= hstart
+ h
->size
;
14192 relstart
= _bfd_elf_link_info_read_relocs (sec
->owner
, info
->info
,
14193 sec
, NULL
, NULL
, true);
14195 return info
->ok
= false;
14196 bed
= get_elf_backend_data (sec
->owner
);
14197 log_file_align
= bed
->s
->log_file_align
;
14199 relend
= relstart
+ sec
->reloc_count
;
14201 for (rel
= relstart
; rel
< relend
; ++rel
)
14202 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
14204 /* If the entry is in use, do nothing. */
14205 if (h
->u2
.vtable
->used
14206 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
14208 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
14209 if (h
->u2
.vtable
->used
[entry
])
14212 /* Otherwise, kill it. */
14213 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
14219 /* Mark sections containing dynamically referenced symbols. When
14220 building shared libraries, we must assume that any visible symbol is
14224 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
14226 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
14227 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
14229 if ((h
->root
.type
== bfd_link_hash_defined
14230 || h
->root
.type
== bfd_link_hash_defweak
)
14232 || h
->root
.ldscript_def
14233 || !info
->start_stop_gc
)
14234 && ((h
->ref_dynamic
&& !h
->forced_local
)
14235 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
14236 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
14237 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
14238 && (!bfd_link_executable (info
)
14239 || info
->gc_keep_exported
14240 || info
->export_dynamic
14243 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
14244 && (h
->versioned
>= versioned
14245 || !bfd_hide_sym_by_version (info
->version_info
,
14246 h
->root
.root
.string
)))))
14247 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
14252 /* Keep all sections containing symbols undefined on the command-line,
14253 and the section containing the entry symbol. */
14256 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
14258 struct bfd_sym_chain
*sym
;
14260 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
14262 struct elf_link_hash_entry
*h
;
14264 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
14265 false, false, false);
14268 && (h
->root
.type
== bfd_link_hash_defined
14269 || h
->root
.type
== bfd_link_hash_defweak
)
14270 && !bfd_is_const_section (h
->root
.u
.def
.section
))
14271 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
14276 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
14277 struct bfd_link_info
*info
)
14279 bfd
*ibfd
= info
->input_bfds
;
14281 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
14284 struct elf_reloc_cookie cookie
;
14286 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
14288 sec
= ibfd
->sections
;
14289 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14292 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
14295 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
14297 if (startswith (bfd_section_name (sec
), ".eh_frame_entry")
14298 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
14300 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
14301 fini_reloc_cookie_rels (&cookie
, sec
);
14308 /* Do mark and sweep of unused sections. */
14311 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
14315 elf_gc_mark_hook_fn gc_mark_hook
;
14316 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14317 struct elf_link_hash_table
*htab
;
14318 struct link_info_ok info_ok
;
14320 if (!bed
->can_gc_sections
14321 || !is_elf_hash_table (info
->hash
))
14323 _bfd_error_handler(_("warning: gc-sections option ignored"));
14327 bed
->gc_keep (info
);
14328 htab
= elf_hash_table (info
);
14330 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
14331 at the .eh_frame section if we can mark the FDEs individually. */
14332 for (sub
= info
->input_bfds
;
14333 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
14334 sub
= sub
->link
.next
)
14337 struct elf_reloc_cookie cookie
;
14339 sec
= sub
->sections
;
14340 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14342 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
14343 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
14345 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
14346 if (elf_section_data (sec
)->sec_info
14347 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
14348 elf_eh_frame_section (sub
) = sec
;
14349 fini_reloc_cookie_for_section (&cookie
, sec
);
14350 sec
= bfd_get_next_section_by_name (NULL
, sec
);
14354 /* Apply transitive closure to the vtable entry usage info. */
14355 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
14359 /* Kill the vtable relocations that were not used. */
14360 info_ok
.info
= info
;
14362 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &info_ok
);
14366 /* Mark dynamically referenced symbols. */
14367 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
14368 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
14370 /* Grovel through relocs to find out who stays ... */
14371 gc_mark_hook
= bed
->gc_mark_hook
;
14372 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14376 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14377 || elf_object_id (sub
) != elf_hash_table_id (htab
)
14378 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14382 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14385 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
14386 Also treat note sections as a root, if the section is not part
14387 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
14388 well as FINI_ARRAY sections for ld -r. */
14389 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14391 && (o
->flags
& SEC_EXCLUDE
) == 0
14392 && ((o
->flags
& SEC_KEEP
) != 0
14393 || (bfd_link_relocatable (info
)
14394 && ((elf_section_data (o
)->this_hdr
.sh_type
14395 == SHT_PREINIT_ARRAY
)
14396 || (elf_section_data (o
)->this_hdr
.sh_type
14398 || (elf_section_data (o
)->this_hdr
.sh_type
14399 == SHT_FINI_ARRAY
)))
14400 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
14401 && elf_next_in_group (o
) == NULL
14402 && elf_linked_to_section (o
) == NULL
)
14403 || ((elf_tdata (sub
)->has_gnu_osabi
& elf_gnu_osabi_retain
)
14404 && (elf_section_flags (o
) & SHF_GNU_RETAIN
))))
14406 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
14411 /* Allow the backend to mark additional target specific sections. */
14412 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
14414 /* ... and mark SEC_EXCLUDE for those that go. */
14415 return elf_gc_sweep (abfd
, info
);
14418 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
14421 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
14423 struct elf_link_hash_entry
*h
,
14426 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
14427 struct elf_link_hash_entry
**search
, *child
;
14428 size_t extsymcount
;
14429 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14431 /* The sh_info field of the symtab header tells us where the
14432 external symbols start. We don't care about the local symbols at
14434 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
14435 if (!elf_bad_symtab (abfd
))
14436 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
14438 sym_hashes
= elf_sym_hashes (abfd
);
14439 sym_hashes_end
= PTR_ADD (sym_hashes
, extsymcount
);
14441 /* Hunt down the child symbol, which is in this section at the same
14442 offset as the relocation. */
14443 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
14445 if ((child
= *search
) != NULL
14446 && (child
->root
.type
== bfd_link_hash_defined
14447 || child
->root
.type
== bfd_link_hash_defweak
)
14448 && child
->root
.u
.def
.section
== sec
14449 && child
->root
.u
.def
.value
== offset
)
14453 /* xgettext:c-format */
14454 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
14455 abfd
, sec
, (uint64_t) offset
);
14456 bfd_set_error (bfd_error_invalid_operation
);
14460 if (!child
->u2
.vtable
)
14462 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14463 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
14464 if (!child
->u2
.vtable
)
14469 /* This *should* only be the absolute section. It could potentially
14470 be that someone has defined a non-global vtable though, which
14471 would be bad. It isn't worth paging in the local symbols to be
14472 sure though; that case should simply be handled by the assembler. */
14474 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
14477 child
->u2
.vtable
->parent
= h
;
14482 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
14485 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
14486 struct elf_link_hash_entry
*h
,
14489 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14490 unsigned int log_file_align
= bed
->s
->log_file_align
;
14494 /* xgettext:c-format */
14495 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
14497 bfd_set_error (bfd_error_bad_value
);
14503 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14504 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14509 if (addend
>= h
->u2
.vtable
->size
)
14511 size_t size
, bytes
, file_align
;
14512 bool *ptr
= h
->u2
.vtable
->used
;
14514 /* While the symbol is undefined, we have to be prepared to handle
14516 file_align
= 1 << log_file_align
;
14517 if (h
->root
.type
== bfd_link_hash_undefined
)
14518 size
= addend
+ file_align
;
14522 if (addend
>= size
)
14524 /* Oops! We've got a reference past the defined end of
14525 the table. This is probably a bug -- shall we warn? */
14526 size
= addend
+ file_align
;
14529 size
= (size
+ file_align
- 1) & -file_align
;
14531 /* Allocate one extra entry for use as a "done" flag for the
14532 consolidation pass. */
14533 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bool);
14537 ptr
= (bool *) bfd_realloc (ptr
- 1, bytes
);
14543 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14545 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14549 ptr
= (bool *) bfd_zmalloc (bytes
);
14554 /* And arrange for that done flag to be at index -1. */
14555 h
->u2
.vtable
->used
= ptr
+ 1;
14556 h
->u2
.vtable
->size
= size
;
14559 h
->u2
.vtable
->used
[addend
>> log_file_align
] = true;
14564 /* Map an ELF section header flag to its corresponding string. */
14568 flagword flag_value
;
14569 } elf_flags_to_name_table
;
14571 static const elf_flags_to_name_table elf_flags_to_names
[] =
14573 { "SHF_WRITE", SHF_WRITE
},
14574 { "SHF_ALLOC", SHF_ALLOC
},
14575 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14576 { "SHF_MERGE", SHF_MERGE
},
14577 { "SHF_STRINGS", SHF_STRINGS
},
14578 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14579 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14580 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14581 { "SHF_GROUP", SHF_GROUP
},
14582 { "SHF_TLS", SHF_TLS
},
14583 { "SHF_MASKOS", SHF_MASKOS
},
14584 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14587 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14589 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14590 struct flag_info
*flaginfo
,
14593 const bfd_vma sh_flags
= elf_section_flags (section
);
14595 if (!flaginfo
->flags_initialized
)
14597 bfd
*obfd
= info
->output_bfd
;
14598 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14599 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14601 int without_hex
= 0;
14603 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14606 flagword (*lookup
) (char *);
14608 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14609 if (lookup
!= NULL
)
14611 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14615 if (tf
->with
== with_flags
)
14616 with_hex
|= hexval
;
14617 else if (tf
->with
== without_flags
)
14618 without_hex
|= hexval
;
14623 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14625 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14627 if (tf
->with
== with_flags
)
14628 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14629 else if (tf
->with
== without_flags
)
14630 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14637 info
->callbacks
->einfo
14638 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14642 flaginfo
->flags_initialized
= true;
14643 flaginfo
->only_with_flags
|= with_hex
;
14644 flaginfo
->not_with_flags
|= without_hex
;
14647 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14650 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14656 struct alloc_got_off_arg
{
14658 struct bfd_link_info
*info
;
14661 /* We need a special top-level link routine to convert got reference counts
14662 to real got offsets. */
14665 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14667 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14668 bfd
*obfd
= gofarg
->info
->output_bfd
;
14669 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14671 if (h
->got
.refcount
> 0)
14673 h
->got
.offset
= gofarg
->gotoff
;
14674 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14677 h
->got
.offset
= (bfd_vma
) -1;
14682 /* And an accompanying bit to work out final got entry offsets once
14683 we're done. Should be called from final_link. */
14686 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14687 struct bfd_link_info
*info
)
14690 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14692 struct alloc_got_off_arg gofarg
;
14694 BFD_ASSERT (abfd
== info
->output_bfd
);
14696 if (! is_elf_hash_table (info
->hash
))
14699 /* The GOT offset is relative to the .got section, but the GOT header is
14700 put into the .got.plt section, if the backend uses it. */
14701 if (bed
->want_got_plt
)
14704 gotoff
= bed
->got_header_size
;
14706 /* Do the local .got entries first. */
14707 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14709 bfd_signed_vma
*local_got
;
14710 size_t j
, locsymcount
;
14711 Elf_Internal_Shdr
*symtab_hdr
;
14713 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14716 local_got
= elf_local_got_refcounts (i
);
14720 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14721 if (elf_bad_symtab (i
))
14722 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14724 locsymcount
= symtab_hdr
->sh_info
;
14726 for (j
= 0; j
< locsymcount
; ++j
)
14728 if (local_got
[j
] > 0)
14730 local_got
[j
] = gotoff
;
14731 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14734 local_got
[j
] = (bfd_vma
) -1;
14738 /* Then the global .got entries. .plt refcounts are handled by
14739 adjust_dynamic_symbol */
14740 gofarg
.gotoff
= gotoff
;
14741 gofarg
.info
= info
;
14742 elf_link_hash_traverse (elf_hash_table (info
),
14743 elf_gc_allocate_got_offsets
,
14748 /* Many folk need no more in the way of final link than this, once
14749 got entry reference counting is enabled. */
14752 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14754 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14757 /* Invoke the regular ELF backend linker to do all the work. */
14758 return bfd_elf_final_link (abfd
, info
);
14762 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14764 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14766 if (rcookie
->bad_symtab
)
14767 rcookie
->rel
= rcookie
->rels
;
14769 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14771 unsigned long r_symndx
;
14773 if (! rcookie
->bad_symtab
)
14774 if (rcookie
->rel
->r_offset
> offset
)
14776 if (rcookie
->rel
->r_offset
!= offset
)
14779 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14780 if (r_symndx
== STN_UNDEF
)
14783 if (r_symndx
>= rcookie
->locsymcount
14784 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14786 struct elf_link_hash_entry
*h
;
14788 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14790 while (h
->root
.type
== bfd_link_hash_indirect
14791 || h
->root
.type
== bfd_link_hash_warning
)
14792 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14794 if ((h
->root
.type
== bfd_link_hash_defined
14795 || h
->root
.type
== bfd_link_hash_defweak
)
14796 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14797 || h
->root
.u
.def
.section
->kept_section
!= NULL
14798 || discarded_section (h
->root
.u
.def
.section
)))
14803 /* It's not a relocation against a global symbol,
14804 but it could be a relocation against a local
14805 symbol for a discarded section. */
14807 Elf_Internal_Sym
*isym
;
14809 /* Need to: get the symbol; get the section. */
14810 isym
= &rcookie
->locsyms
[r_symndx
];
14811 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14813 && (isec
->kept_section
!= NULL
14814 || discarded_section (isec
)))
14822 /* Discard unneeded references to discarded sections.
14823 Returns -1 on error, 1 if any section's size was changed, 0 if
14824 nothing changed. This function assumes that the relocations are in
14825 sorted order, which is true for all known assemblers. */
14828 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14830 struct elf_reloc_cookie cookie
;
14835 if (info
->traditional_format
14836 || !is_elf_hash_table (info
->hash
))
14839 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14844 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14847 || i
->reloc_count
== 0
14848 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14852 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14855 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14858 if (_bfd_discard_section_stabs (abfd
, i
,
14859 elf_section_data (i
)->sec_info
,
14860 bfd_elf_reloc_symbol_deleted_p
,
14864 fini_reloc_cookie_for_section (&cookie
, i
);
14869 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14870 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14874 int eh_changed
= 0;
14875 unsigned int eh_alignment
; /* Octets. */
14877 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14883 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14886 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14889 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14890 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14891 bfd_elf_reloc_symbol_deleted_p
,
14895 if (i
->size
!= i
->rawsize
)
14899 fini_reloc_cookie_for_section (&cookie
, i
);
14902 eh_alignment
= ((1 << o
->alignment_power
)
14903 * bfd_octets_per_byte (output_bfd
, o
));
14904 /* Skip over zero terminator, and prevent empty sections from
14905 adding alignment padding at the end. */
14906 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14908 i
->flags
|= SEC_EXCLUDE
;
14909 else if (i
->size
> 4)
14911 /* The last non-empty eh_frame section doesn't need padding. */
14914 /* Any prior sections must pad the last FDE out to the output
14915 section alignment. Otherwise we might have zero padding
14916 between sections, which would be seen as a terminator. */
14917 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14919 /* All but the last zero terminator should have been removed. */
14924 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14925 if (i
->size
!= size
)
14933 elf_link_hash_traverse (elf_hash_table (info
),
14934 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14937 o
= bfd_get_section_by_name (output_bfd
, ".sframe");
14942 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14948 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14951 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14954 if (_bfd_elf_parse_sframe (abfd
, info
, i
, &cookie
))
14956 if (_bfd_elf_discard_section_sframe (i
,
14957 bfd_elf_reloc_symbol_deleted_p
,
14960 if (i
->size
!= i
->rawsize
)
14964 fini_reloc_cookie_for_section (&cookie
, i
);
14966 /* Update the reference to the output .sframe section. Used to
14967 determine later if PT_GNU_SFRAME segment is to be generated. */
14968 if (!_bfd_elf_set_section_sframe (output_bfd
, info
))
14972 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14974 const struct elf_backend_data
*bed
;
14977 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14979 s
= abfd
->sections
;
14980 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14983 bed
= get_elf_backend_data (abfd
);
14985 if (bed
->elf_backend_discard_info
!= NULL
)
14987 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14990 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14993 fini_reloc_cookie (&cookie
, abfd
);
14997 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14998 _bfd_elf_end_eh_frame_parsing (info
);
15000 if (info
->eh_frame_hdr_type
15001 && !bfd_link_relocatable (info
)
15002 && _bfd_elf_discard_section_eh_frame_hdr (info
))
15009 _bfd_elf_section_already_linked (bfd
*abfd
,
15011 struct bfd_link_info
*info
)
15014 const char *name
, *key
;
15015 struct bfd_section_already_linked
*l
;
15016 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
15018 if (sec
->output_section
== bfd_abs_section_ptr
)
15021 flags
= sec
->flags
;
15023 /* Return if it isn't a linkonce section. A comdat group section
15024 also has SEC_LINK_ONCE set. */
15025 if ((flags
& SEC_LINK_ONCE
) == 0)
15028 /* Don't put group member sections on our list of already linked
15029 sections. They are handled as a group via their group section. */
15030 if (elf_sec_group (sec
) != NULL
)
15033 /* For a SHT_GROUP section, use the group signature as the key. */
15035 if ((flags
& SEC_GROUP
) != 0
15036 && elf_next_in_group (sec
) != NULL
15037 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
15038 key
= elf_group_name (elf_next_in_group (sec
));
15041 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
15042 if (startswith (name
, ".gnu.linkonce.")
15043 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
15046 /* Must be a user linkonce section that doesn't follow gcc's
15047 naming convention. In this case we won't be matching
15048 single member groups. */
15052 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
15054 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
15056 /* We may have 2 different types of sections on the list: group
15057 sections with a signature of <key> (<key> is some string),
15058 and linkonce sections named .gnu.linkonce.<type>.<key>.
15059 Match like sections. LTO plugin sections are an exception.
15060 They are always named .gnu.linkonce.t.<key> and match either
15061 type of section. */
15062 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
15063 && ((flags
& SEC_GROUP
) != 0
15064 || strcmp (name
, l
->sec
->name
) == 0))
15065 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0
15066 || (sec
->owner
->flags
& BFD_PLUGIN
) != 0)
15068 /* The section has already been linked. See if we should
15069 issue a warning. */
15070 if (!_bfd_handle_already_linked (sec
, l
, info
))
15073 if (flags
& SEC_GROUP
)
15075 asection
*first
= elf_next_in_group (sec
);
15076 asection
*s
= first
;
15080 s
->output_section
= bfd_abs_section_ptr
;
15081 /* Record which group discards it. */
15082 s
->kept_section
= l
->sec
;
15083 s
= elf_next_in_group (s
);
15084 /* These lists are circular. */
15094 /* A single member comdat group section may be discarded by a
15095 linkonce section and vice versa. */
15096 if ((flags
& SEC_GROUP
) != 0)
15098 asection
*first
= elf_next_in_group (sec
);
15100 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
15101 /* Check this single member group against linkonce sections. */
15102 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
15103 if ((l
->sec
->flags
& SEC_GROUP
) == 0
15104 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
15106 first
->output_section
= bfd_abs_section_ptr
;
15107 first
->kept_section
= l
->sec
;
15108 sec
->output_section
= bfd_abs_section_ptr
;
15113 /* Check this linkonce section against single member groups. */
15114 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
15115 if (l
->sec
->flags
& SEC_GROUP
)
15117 asection
*first
= elf_next_in_group (l
->sec
);
15120 && elf_next_in_group (first
) == first
15121 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
15123 sec
->output_section
= bfd_abs_section_ptr
;
15124 sec
->kept_section
= first
;
15129 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
15130 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
15131 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
15132 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
15133 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
15134 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
15135 `.gnu.linkonce.t.F' section from a different bfd not requiring any
15136 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
15137 The reverse order cannot happen as there is never a bfd with only the
15138 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
15139 matter as here were are looking only for cross-bfd sections. */
15141 if ((flags
& SEC_GROUP
) == 0 && startswith (name
, ".gnu.linkonce.r."))
15142 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
15143 if ((l
->sec
->flags
& SEC_GROUP
) == 0
15144 && startswith (l
->sec
->name
, ".gnu.linkonce.t."))
15146 if (abfd
!= l
->sec
->owner
)
15147 sec
->output_section
= bfd_abs_section_ptr
;
15151 /* This is the first section with this name. Record it. */
15152 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
15153 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
15154 return sec
->output_section
== bfd_abs_section_ptr
;
15158 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
15160 return sym
->st_shndx
== SHN_COMMON
;
15164 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
15170 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
15172 return bfd_com_section_ptr
;
15176 _bfd_elf_default_got_elt_size (bfd
*abfd
,
15177 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
15178 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
15179 bfd
*ibfd ATTRIBUTE_UNUSED
,
15180 unsigned long symndx ATTRIBUTE_UNUSED
)
15182 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
15183 return bed
->s
->arch_size
/ 8;
15186 /* Routines to support the creation of dynamic relocs. */
15188 /* Returns the name of the dynamic reloc section associated with SEC. */
15190 static const char *
15191 get_dynamic_reloc_section_name (bfd
* abfd
,
15196 const char *old_name
= bfd_section_name (sec
);
15197 const char *prefix
= is_rela
? ".rela" : ".rel";
15199 if (old_name
== NULL
)
15202 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
15203 sprintf (name
, "%s%s", prefix
, old_name
);
15208 /* Returns the dynamic reloc section associated with SEC.
15209 If necessary compute the name of the dynamic reloc section based
15210 on SEC's name (looked up in ABFD's string table) and the setting
15214 _bfd_elf_get_dynamic_reloc_section (bfd
*abfd
,
15218 asection
*reloc_sec
= elf_section_data (sec
)->sreloc
;
15220 if (reloc_sec
== NULL
)
15222 const char *name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
15226 reloc_sec
= bfd_get_linker_section (abfd
, name
);
15228 if (reloc_sec
!= NULL
)
15229 elf_section_data (sec
)->sreloc
= reloc_sec
;
15236 /* Returns the dynamic reloc section associated with SEC. If the
15237 section does not exist it is created and attached to the DYNOBJ
15238 bfd and stored in the SRELOC field of SEC's elf_section_data
15241 ALIGNMENT is the alignment for the newly created section and
15242 IS_RELA defines whether the name should be .rela.<SEC's name>
15243 or .rel.<SEC's name>. The section name is looked up in the
15244 string table associated with ABFD. */
15247 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
15249 unsigned int alignment
,
15253 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
15255 if (reloc_sec
== NULL
)
15257 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
15262 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
15264 if (reloc_sec
== NULL
)
15266 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
15267 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
15268 if ((sec
->flags
& SEC_ALLOC
) != 0)
15269 flags
|= SEC_ALLOC
| SEC_LOAD
;
15271 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
15272 if (reloc_sec
!= NULL
)
15274 /* _bfd_elf_get_sec_type_attr chooses a section type by
15275 name. Override as it may be wrong, eg. for a user
15276 section named "auto" we'll get ".relauto" which is
15277 seen to be a .rela section. */
15278 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
15279 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
15284 elf_section_data (sec
)->sreloc
= reloc_sec
;
15290 /* Copy the ELF symbol type and other attributes for a linker script
15291 assignment from HSRC to HDEST. Generally this should be treated as
15292 if we found a strong non-dynamic definition for HDEST (except that
15293 ld ignores multiple definition errors). */
15295 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
15296 struct bfd_link_hash_entry
*hdest
,
15297 struct bfd_link_hash_entry
*hsrc
)
15299 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
15300 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
15301 Elf_Internal_Sym isym
;
15303 ehdest
->type
= ehsrc
->type
;
15304 ehdest
->target_internal
= ehsrc
->target_internal
;
15306 isym
.st_other
= ehsrc
->other
;
15307 elf_merge_st_other (abfd
, ehdest
, isym
.st_other
, NULL
, true, false);
15310 /* Append a RELA relocation REL to section S in BFD. */
15313 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
15315 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
15316 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
15317 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
15318 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
15321 /* Append a REL relocation REL to section S in BFD. */
15324 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
15326 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
15327 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
15328 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
15329 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
15332 /* Define __start, __stop, .startof. or .sizeof. symbol. */
15334 struct bfd_link_hash_entry
*
15335 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
15336 const char *symbol
, asection
*sec
)
15338 struct elf_link_hash_entry
*h
;
15340 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
15341 false, false, true);
15342 /* NB: Common symbols will be turned into definition later. */
15344 && !h
->root
.ldscript_def
15345 && (h
->root
.type
== bfd_link_hash_undefined
15346 || h
->root
.type
== bfd_link_hash_undefweak
15347 || ((h
->ref_regular
|| h
->def_dynamic
)
15349 && h
->root
.type
!= bfd_link_hash_common
)))
15351 bool was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
15352 h
->verinfo
.verdef
= NULL
;
15353 h
->root
.type
= bfd_link_hash_defined
;
15354 h
->root
.u
.def
.section
= sec
;
15355 h
->root
.u
.def
.value
= 0;
15356 h
->def_regular
= 1;
15357 h
->def_dynamic
= 0;
15359 h
->u2
.start_stop_section
= sec
;
15360 if (symbol
[0] == '.')
15362 /* .startof. and .sizeof. symbols are local. */
15363 const struct elf_backend_data
*bed
;
15364 bed
= get_elf_backend_data (info
->output_bfd
);
15365 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
15369 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
15370 h
->other
= ((h
->other
& ~ELF_ST_VISIBILITY (-1))
15371 | info
->start_stop_visibility
);
15373 bfd_elf_link_record_dynamic_symbol (info
, h
);
15380 /* Find dynamic relocs for H that apply to read-only sections. */
15383 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
15385 struct elf_dyn_relocs
*p
;
15387 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
15389 asection
*s
= p
->sec
->output_section
;
15391 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
15397 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
15398 read-only sections. */
15401 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
15405 if (h
->root
.type
== bfd_link_hash_indirect
)
15408 sec
= _bfd_elf_readonly_dynrelocs (h
);
15411 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
15413 info
->flags
|= DF_TEXTREL
;
15414 /* xgettext:c-format */
15415 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
15416 "in read-only section `%pA'\n"),
15417 sec
->owner
, h
->root
.root
.string
, sec
);
15419 if (bfd_link_textrel_check (info
))
15420 /* xgettext:c-format */
15421 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
15422 "in read-only section `%pA'\n"),
15423 sec
->owner
, h
->root
.root
.string
, sec
);
15425 /* Not an error, just cut short the traversal. */
15431 /* Add dynamic tags. */
15434 _bfd_elf_add_dynamic_tags (bfd
*output_bfd
, struct bfd_link_info
*info
,
15435 bool need_dynamic_reloc
)
15437 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
15439 if (htab
->dynamic_sections_created
)
15441 /* Add some entries to the .dynamic section. We fill in the
15442 values later, in finish_dynamic_sections, but we must add
15443 the entries now so that we get the correct size for the
15444 .dynamic section. The DT_DEBUG entry is filled in by the
15445 dynamic linker and used by the debugger. */
15446 #define add_dynamic_entry(TAG, VAL) \
15447 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
15449 const struct elf_backend_data
*bed
15450 = get_elf_backend_data (output_bfd
);
15452 if (bfd_link_executable (info
))
15454 if (!add_dynamic_entry (DT_DEBUG
, 0))
15458 if (htab
->dt_pltgot_required
|| htab
->splt
->size
!= 0)
15460 /* DT_PLTGOT is used by prelink even if there is no PLT
15462 if (!add_dynamic_entry (DT_PLTGOT
, 0))
15466 if (htab
->dt_jmprel_required
|| htab
->srelplt
->size
!= 0)
15468 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
15469 || !add_dynamic_entry (DT_PLTREL
,
15470 (bed
->rela_plts_and_copies_p
15471 ? DT_RELA
: DT_REL
))
15472 || !add_dynamic_entry (DT_JMPREL
, 0))
15476 if (htab
->tlsdesc_plt
15477 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
15478 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
15481 if (need_dynamic_reloc
)
15483 if (bed
->rela_plts_and_copies_p
)
15485 if (!add_dynamic_entry (DT_RELA
, 0)
15486 || !add_dynamic_entry (DT_RELASZ
, 0)
15487 || !add_dynamic_entry (DT_RELAENT
,
15488 bed
->s
->sizeof_rela
))
15493 if (!add_dynamic_entry (DT_REL
, 0)
15494 || !add_dynamic_entry (DT_RELSZ
, 0)
15495 || !add_dynamic_entry (DT_RELENT
,
15496 bed
->s
->sizeof_rel
))
15500 /* If any dynamic relocs apply to a read-only section,
15501 then we need a DT_TEXTREL entry. */
15502 if ((info
->flags
& DF_TEXTREL
) == 0)
15503 elf_link_hash_traverse (htab
, _bfd_elf_maybe_set_textrel
,
15506 if ((info
->flags
& DF_TEXTREL
) != 0)
15508 if (htab
->ifunc_resolvers
)
15509 info
->callbacks
->einfo
15510 (_("%P: warning: GNU indirect functions with DT_TEXTREL "
15511 "may result in a segfault at runtime; recompile with %s\n"),
15512 bfd_link_dll (info
) ? "-fPIC" : "-fPIE");
15514 if (!add_dynamic_entry (DT_TEXTREL
, 0))
15519 #undef add_dynamic_entry