1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2021 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
30 #if BFD_SUPPORTS_PLUGINS
31 #include "plugin-api.h"
40 /* This struct is used to pass information to routines called via
41 elf_link_hash_traverse which must return failure. */
43 struct elf_info_failed
45 struct bfd_link_info
*info
;
49 /* This structure is used to pass information to
50 _bfd_elf_link_find_version_dependencies. */
52 struct elf_find_verdep_info
54 /* General link information. */
55 struct bfd_link_info
*info
;
56 /* The number of dependencies. */
58 /* Whether we had a failure. */
62 static bool _bfd_elf_fix_symbol_flags
63 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
66 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
67 unsigned long r_symndx
,
70 if (r_symndx
>= cookie
->locsymcount
71 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
73 struct elf_link_hash_entry
*h
;
75 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
77 while (h
->root
.type
== bfd_link_hash_indirect
78 || h
->root
.type
== bfd_link_hash_warning
)
79 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
81 if ((h
->root
.type
== bfd_link_hash_defined
82 || h
->root
.type
== bfd_link_hash_defweak
)
83 && discarded_section (h
->root
.u
.def
.section
))
84 return h
->root
.u
.def
.section
;
90 /* It's not a relocation against a global symbol,
91 but it could be a relocation against a local
92 symbol for a discarded section. */
94 Elf_Internal_Sym
*isym
;
96 /* Need to: get the symbol; get the section. */
97 isym
= &cookie
->locsyms
[r_symndx
];
98 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
100 && discard
? discarded_section (isec
) : 1)
106 /* Define a symbol in a dynamic linkage section. */
108 struct elf_link_hash_entry
*
109 _bfd_elf_define_linkage_sym (bfd
*abfd
,
110 struct bfd_link_info
*info
,
114 struct elf_link_hash_entry
*h
;
115 struct bfd_link_hash_entry
*bh
;
116 const struct elf_backend_data
*bed
;
118 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, false, false, false);
121 /* Zap symbol defined in an as-needed lib that wasn't linked.
122 This is a symptom of a larger problem: Absolute symbols
123 defined in shared libraries can't be overridden, because we
124 lose the link to the bfd which is via the symbol section. */
125 h
->root
.type
= bfd_link_hash_new
;
131 bed
= get_elf_backend_data (abfd
);
132 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
133 sec
, 0, NULL
, false, bed
->collect
,
136 h
= (struct elf_link_hash_entry
*) bh
;
137 BFD_ASSERT (h
!= NULL
);
140 h
->root
.linker_def
= 1;
141 h
->type
= STT_OBJECT
;
142 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
143 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
145 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
150 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
154 struct elf_link_hash_entry
*h
;
155 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
156 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
158 /* This function may be called more than once. */
159 if (htab
->sgot
!= NULL
)
162 flags
= bed
->dynamic_sec_flags
;
164 s
= bfd_make_section_anyway_with_flags (abfd
,
165 (bed
->rela_plts_and_copies_p
166 ? ".rela.got" : ".rel.got"),
167 (bed
->dynamic_sec_flags
170 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
174 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
176 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
180 if (bed
->want_got_plt
)
182 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
184 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
189 /* The first bit of the global offset table is the header. */
190 s
->size
+= bed
->got_header_size
;
192 if (bed
->want_got_sym
)
194 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
195 (or .got.plt) section. We don't do this in the linker script
196 because we don't want to define the symbol if we are not creating
197 a global offset table. */
198 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
199 "_GLOBAL_OFFSET_TABLE_");
200 elf_hash_table (info
)->hgot
= h
;
208 /* Create a strtab to hold the dynamic symbol names. */
210 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
212 struct elf_link_hash_table
*hash_table
;
214 hash_table
= elf_hash_table (info
);
215 if (hash_table
->dynobj
== NULL
)
217 /* We may not set dynobj, an input file holding linker created
218 dynamic sections to abfd, which may be a dynamic object with
219 its own dynamic sections. We need to find a normal input file
220 to hold linker created sections if possible. */
221 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
225 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
227 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
228 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
229 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
230 && !((s
= ibfd
->sections
) != NULL
231 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
237 hash_table
->dynobj
= abfd
;
240 if (hash_table
->dynstr
== NULL
)
242 hash_table
->dynstr
= _bfd_elf_strtab_init ();
243 if (hash_table
->dynstr
== NULL
)
249 /* Create some sections which will be filled in with dynamic linking
250 information. ABFD is an input file which requires dynamic sections
251 to be created. The dynamic sections take up virtual memory space
252 when the final executable is run, so we need to create them before
253 addresses are assigned to the output sections. We work out the
254 actual contents and size of these sections later. */
257 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
261 const struct elf_backend_data
*bed
;
262 struct elf_link_hash_entry
*h
;
264 if (! is_elf_hash_table (info
->hash
))
267 if (elf_hash_table (info
)->dynamic_sections_created
)
270 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
273 abfd
= elf_hash_table (info
)->dynobj
;
274 bed
= get_elf_backend_data (abfd
);
276 flags
= bed
->dynamic_sec_flags
;
278 /* A dynamically linked executable has a .interp section, but a
279 shared library does not. */
280 if (bfd_link_executable (info
) && !info
->nointerp
)
282 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
283 flags
| SEC_READONLY
);
288 /* Create sections to hold version informations. These are removed
289 if they are not needed. */
290 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
291 flags
| SEC_READONLY
);
293 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
296 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
297 flags
| SEC_READONLY
);
299 || !bfd_set_section_alignment (s
, 1))
302 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
303 flags
| SEC_READONLY
);
305 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
308 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
309 flags
| SEC_READONLY
);
311 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
313 elf_hash_table (info
)->dynsym
= s
;
315 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
316 flags
| SEC_READONLY
);
320 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
322 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
325 /* The special symbol _DYNAMIC is always set to the start of the
326 .dynamic section. We could set _DYNAMIC in a linker script, but we
327 only want to define it if we are, in fact, creating a .dynamic
328 section. We don't want to define it if there is no .dynamic
329 section, since on some ELF platforms the start up code examines it
330 to decide how to initialize the process. */
331 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
332 elf_hash_table (info
)->hdynamic
= h
;
338 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
339 flags
| SEC_READONLY
);
341 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
343 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
346 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
348 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
349 flags
| SEC_READONLY
);
351 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
353 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
354 4 32-bit words followed by variable count of 64-bit words, then
355 variable count of 32-bit words. */
356 if (bed
->s
->arch_size
== 64)
357 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
359 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
362 /* Let the backend create the rest of the sections. This lets the
363 backend set the right flags. The backend will normally create
364 the .got and .plt sections. */
365 if (bed
->elf_backend_create_dynamic_sections
== NULL
366 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
369 elf_hash_table (info
)->dynamic_sections_created
= true;
374 /* Create dynamic sections when linking against a dynamic object. */
377 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
379 flagword flags
, pltflags
;
380 struct elf_link_hash_entry
*h
;
382 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
383 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
385 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
386 .rel[a].bss sections. */
387 flags
= bed
->dynamic_sec_flags
;
390 if (bed
->plt_not_loaded
)
391 /* We do not clear SEC_ALLOC here because we still want the OS to
392 allocate space for the section; it's just that there's nothing
393 to read in from the object file. */
394 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
396 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
397 if (bed
->plt_readonly
)
398 pltflags
|= SEC_READONLY
;
400 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
402 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
406 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
408 if (bed
->want_plt_sym
)
410 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
411 "_PROCEDURE_LINKAGE_TABLE_");
412 elf_hash_table (info
)->hplt
= h
;
417 s
= bfd_make_section_anyway_with_flags (abfd
,
418 (bed
->rela_plts_and_copies_p
419 ? ".rela.plt" : ".rel.plt"),
420 flags
| SEC_READONLY
);
422 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
426 if (! _bfd_elf_create_got_section (abfd
, info
))
429 if (bed
->want_dynbss
)
431 /* The .dynbss section is a place to put symbols which are defined
432 by dynamic objects, are referenced by regular objects, and are
433 not functions. We must allocate space for them in the process
434 image and use a R_*_COPY reloc to tell the dynamic linker to
435 initialize them at run time. The linker script puts the .dynbss
436 section into the .bss section of the final image. */
437 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
438 SEC_ALLOC
| SEC_LINKER_CREATED
);
443 if (bed
->want_dynrelro
)
445 /* Similarly, but for symbols that were originally in read-only
446 sections. This section doesn't really need to have contents,
447 but make it like other .data.rel.ro sections. */
448 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
455 /* The .rel[a].bss section holds copy relocs. This section is not
456 normally needed. We need to create it here, though, so that the
457 linker will map it to an output section. We can't just create it
458 only if we need it, because we will not know whether we need it
459 until we have seen all the input files, and the first time the
460 main linker code calls BFD after examining all the input files
461 (size_dynamic_sections) the input sections have already been
462 mapped to the output sections. If the section turns out not to
463 be needed, we can discard it later. We will never need this
464 section when generating a shared object, since they do not use
466 if (bfd_link_executable (info
))
468 s
= bfd_make_section_anyway_with_flags (abfd
,
469 (bed
->rela_plts_and_copies_p
470 ? ".rela.bss" : ".rel.bss"),
471 flags
| SEC_READONLY
);
473 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
477 if (bed
->want_dynrelro
)
479 s
= (bfd_make_section_anyway_with_flags
480 (abfd
, (bed
->rela_plts_and_copies_p
481 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
482 flags
| SEC_READONLY
));
484 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
486 htab
->sreldynrelro
= s
;
494 /* Record a new dynamic symbol. We record the dynamic symbols as we
495 read the input files, since we need to have a list of all of them
496 before we can determine the final sizes of the output sections.
497 Note that we may actually call this function even though we are not
498 going to output any dynamic symbols; in some cases we know that a
499 symbol should be in the dynamic symbol table, but only if there is
503 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
504 struct elf_link_hash_entry
*h
)
506 if (h
->dynindx
== -1)
508 struct elf_strtab_hash
*dynstr
;
513 if (h
->root
.type
== bfd_link_hash_defined
514 || h
->root
.type
== bfd_link_hash_defweak
)
516 /* An IR symbol should not be made dynamic. */
517 if (h
->root
.u
.def
.section
!= NULL
518 && h
->root
.u
.def
.section
->owner
!= NULL
519 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
523 /* XXX: The ABI draft says the linker must turn hidden and
524 internal symbols into STB_LOCAL symbols when producing the
525 DSO. However, if ld.so honors st_other in the dynamic table,
526 this would not be necessary. */
527 switch (ELF_ST_VISIBILITY (h
->other
))
531 if (h
->root
.type
!= bfd_link_hash_undefined
532 && h
->root
.type
!= bfd_link_hash_undefweak
)
535 if (!elf_hash_table (info
)->is_relocatable_executable
536 || ((h
->root
.type
== bfd_link_hash_defined
537 || h
->root
.type
== bfd_link_hash_defweak
)
538 && h
->root
.u
.def
.section
->owner
!= NULL
539 && h
->root
.u
.def
.section
->owner
->no_export
)
540 || (h
->root
.type
== bfd_link_hash_common
541 && h
->root
.u
.c
.p
->section
->owner
!= NULL
542 && h
->root
.u
.c
.p
->section
->owner
->no_export
))
550 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
551 ++elf_hash_table (info
)->dynsymcount
;
553 dynstr
= elf_hash_table (info
)->dynstr
;
556 /* Create a strtab to hold the dynamic symbol names. */
557 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
562 /* We don't put any version information in the dynamic string
564 name
= h
->root
.root
.string
;
565 p
= strchr (name
, ELF_VER_CHR
);
567 /* We know that the p points into writable memory. In fact,
568 there are only a few symbols that have read-only names, being
569 those like _GLOBAL_OFFSET_TABLE_ that are created specially
570 by the backends. Most symbols will have names pointing into
571 an ELF string table read from a file, or to objalloc memory. */
574 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
579 if (indx
== (size_t) -1)
581 h
->dynstr_index
= indx
;
587 /* Mark a symbol dynamic. */
590 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
591 struct elf_link_hash_entry
*h
,
592 Elf_Internal_Sym
*sym
)
594 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
596 /* It may be called more than once on the same H. */
597 if(h
->dynamic
|| bfd_link_relocatable (info
))
600 if ((info
->dynamic_data
601 && (h
->type
== STT_OBJECT
602 || h
->type
== STT_COMMON
604 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
605 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
608 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
611 /* NB: If a symbol is made dynamic by --dynamic-list, it has
613 h
->root
.non_ir_ref_dynamic
= 1;
617 /* Record an assignment to a symbol made by a linker script. We need
618 this in case some dynamic object refers to this symbol. */
621 bfd_elf_record_link_assignment (bfd
*output_bfd
,
622 struct bfd_link_info
*info
,
627 struct elf_link_hash_entry
*h
, *hv
;
628 struct elf_link_hash_table
*htab
;
629 const struct elf_backend_data
*bed
;
631 if (!is_elf_hash_table (info
->hash
))
634 htab
= elf_hash_table (info
);
635 h
= elf_link_hash_lookup (htab
, name
, !provide
, true, false);
639 if (h
->root
.type
== bfd_link_hash_warning
)
640 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
642 if (h
->versioned
== unknown
)
644 /* Set versioned if symbol version is unknown. */
645 char *version
= strrchr (name
, ELF_VER_CHR
);
648 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
649 h
->versioned
= versioned_hidden
;
651 h
->versioned
= versioned
;
655 /* Symbols defined in a linker script but not referenced anywhere
656 else will have non_elf set. */
659 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
663 switch (h
->root
.type
)
665 case bfd_link_hash_defined
:
666 case bfd_link_hash_defweak
:
667 case bfd_link_hash_common
:
669 case bfd_link_hash_undefweak
:
670 case bfd_link_hash_undefined
:
671 /* Since we're defining the symbol, don't let it seem to have not
672 been defined. record_dynamic_symbol and size_dynamic_sections
673 may depend on this. */
674 h
->root
.type
= bfd_link_hash_new
;
675 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
676 bfd_link_repair_undef_list (&htab
->root
);
678 case bfd_link_hash_new
:
680 case bfd_link_hash_indirect
:
681 /* We had a versioned symbol in a dynamic library. We make the
682 the versioned symbol point to this one. */
683 bed
= get_elf_backend_data (output_bfd
);
685 while (hv
->root
.type
== bfd_link_hash_indirect
686 || hv
->root
.type
== bfd_link_hash_warning
)
687 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
688 /* We don't need to update h->root.u since linker will set them
690 h
->root
.type
= bfd_link_hash_undefined
;
691 hv
->root
.type
= bfd_link_hash_indirect
;
692 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
693 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
700 /* If this symbol is being provided by the linker script, and it is
701 currently defined by a dynamic object, but not by a regular
702 object, then mark it as undefined so that the generic linker will
703 force the correct value. */
707 h
->root
.type
= bfd_link_hash_undefined
;
709 /* If this symbol is currently defined by a dynamic object, but not
710 by a regular object, then clear out any version information because
711 the symbol will not be associated with the dynamic object any
713 if (h
->def_dynamic
&& !h
->def_regular
)
714 h
->verinfo
.verdef
= NULL
;
716 /* Make sure this symbol is not garbage collected. */
723 bed
= get_elf_backend_data (output_bfd
);
724 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
725 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
726 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
729 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
731 if (!bfd_link_relocatable (info
)
733 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
734 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
739 || bfd_link_dll (info
)
740 || elf_hash_table (info
)->is_relocatable_executable
)
744 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
747 /* If this is a weak defined symbol, and we know a corresponding
748 real symbol from the same dynamic object, make sure the real
749 symbol is also made into a dynamic symbol. */
752 struct elf_link_hash_entry
*def
= weakdef (h
);
754 if (def
->dynindx
== -1
755 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
763 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
764 success, and 2 on a failure caused by attempting to record a symbol
765 in a discarded section, eg. a discarded link-once section symbol. */
768 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
773 struct elf_link_local_dynamic_entry
*entry
;
774 struct elf_link_hash_table
*eht
;
775 struct elf_strtab_hash
*dynstr
;
778 Elf_External_Sym_Shndx eshndx
;
779 char esym
[sizeof (Elf64_External_Sym
)];
781 if (! is_elf_hash_table (info
->hash
))
784 /* See if the entry exists already. */
785 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
786 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
789 amt
= sizeof (*entry
);
790 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
794 /* Go find the symbol, so that we can find it's name. */
795 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
796 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
798 bfd_release (input_bfd
, entry
);
802 if (entry
->isym
.st_shndx
!= SHN_UNDEF
803 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
807 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
808 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
810 /* We can still bfd_release here as nothing has done another
811 bfd_alloc. We can't do this later in this function. */
812 bfd_release (input_bfd
, entry
);
817 name
= (bfd_elf_string_from_elf_section
818 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
819 entry
->isym
.st_name
));
821 dynstr
= elf_hash_table (info
)->dynstr
;
824 /* Create a strtab to hold the dynamic symbol names. */
825 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
830 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, false);
831 if (dynstr_index
== (size_t) -1)
833 entry
->isym
.st_name
= dynstr_index
;
835 eht
= elf_hash_table (info
);
837 entry
->next
= eht
->dynlocal
;
838 eht
->dynlocal
= entry
;
839 entry
->input_bfd
= input_bfd
;
840 entry
->input_indx
= input_indx
;
843 /* Whatever binding the symbol had before, it's now local. */
845 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
847 /* The dynindx will be set at the end of size_dynamic_sections. */
852 /* Return the dynindex of a local dynamic symbol. */
855 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
859 struct elf_link_local_dynamic_entry
*e
;
861 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
862 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
867 /* This function is used to renumber the dynamic symbols, if some of
868 them are removed because they are marked as local. This is called
869 via elf_link_hash_traverse. */
872 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
875 size_t *count
= (size_t *) data
;
880 if (h
->dynindx
!= -1)
881 h
->dynindx
= ++(*count
);
887 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
888 STB_LOCAL binding. */
891 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
894 size_t *count
= (size_t *) data
;
896 if (!h
->forced_local
)
899 if (h
->dynindx
!= -1)
900 h
->dynindx
= ++(*count
);
905 /* Return true if the dynamic symbol for a given section should be
906 omitted when creating a shared library. */
908 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
909 struct bfd_link_info
*info
,
912 struct elf_link_hash_table
*htab
;
915 switch (elf_section_data (p
)->this_hdr
.sh_type
)
919 /* If sh_type is yet undecided, assume it could be
920 SHT_PROGBITS/SHT_NOBITS. */
922 htab
= elf_hash_table (info
);
923 if (htab
->text_index_section
!= NULL
)
924 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
926 return (htab
->dynobj
!= NULL
927 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
928 && ip
->output_section
== p
);
930 /* There shouldn't be section relative relocations
931 against any other section. */
938 _bfd_elf_omit_section_dynsym_all
939 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
940 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
941 asection
*p ATTRIBUTE_UNUSED
)
946 /* Assign dynsym indices. In a shared library we generate a section
947 symbol for each output section, which come first. Next come symbols
948 which have been forced to local binding. Then all of the back-end
949 allocated local dynamic syms, followed by the rest of the global
950 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
951 (This prevents the early call before elf_backend_init_index_section
952 and strip_excluded_output_sections setting dynindx for sections
953 that are stripped.) */
956 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
957 struct bfd_link_info
*info
,
958 unsigned long *section_sym_count
)
960 unsigned long dynsymcount
= 0;
961 bool do_sec
= section_sym_count
!= NULL
;
963 if (bfd_link_pic (info
)
964 || elf_hash_table (info
)->is_relocatable_executable
)
966 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
968 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
969 if ((p
->flags
& SEC_EXCLUDE
) == 0
970 && (p
->flags
& SEC_ALLOC
) != 0
971 && elf_hash_table (info
)->dynamic_relocs
972 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
976 elf_section_data (p
)->dynindx
= dynsymcount
;
979 elf_section_data (p
)->dynindx
= 0;
982 *section_sym_count
= dynsymcount
;
984 elf_link_hash_traverse (elf_hash_table (info
),
985 elf_link_renumber_local_hash_table_dynsyms
,
988 if (elf_hash_table (info
)->dynlocal
)
990 struct elf_link_local_dynamic_entry
*p
;
991 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
992 p
->dynindx
= ++dynsymcount
;
994 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
996 elf_link_hash_traverse (elf_hash_table (info
),
997 elf_link_renumber_hash_table_dynsyms
,
1000 /* There is an unused NULL entry at the head of the table which we
1001 must account for in our count even if the table is empty since it
1002 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
1003 .dynamic section. */
1006 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
1010 /* Merge st_other field. */
1013 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
1014 unsigned int st_other
, asection
*sec
,
1015 bool definition
, bool dynamic
)
1017 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1019 /* If st_other has a processor-specific meaning, specific
1020 code might be needed here. */
1021 if (bed
->elf_backend_merge_symbol_attribute
)
1022 (*bed
->elf_backend_merge_symbol_attribute
) (h
, st_other
, definition
,
1027 unsigned symvis
= ELF_ST_VISIBILITY (st_other
);
1028 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1030 /* Keep the most constraining visibility. Leave the remainder
1031 of the st_other field to elf_backend_merge_symbol_attribute. */
1032 if (symvis
- 1 < hvis
- 1)
1033 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1036 && ELF_ST_VISIBILITY (st_other
) != STV_DEFAULT
1037 && (sec
->flags
& SEC_READONLY
) == 0)
1038 h
->protected_def
= 1;
1041 /* This function is called when we want to merge a new symbol with an
1042 existing symbol. It handles the various cases which arise when we
1043 find a definition in a dynamic object, or when there is already a
1044 definition in a dynamic object. The new symbol is described by
1045 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1046 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1047 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1048 of an old common symbol. We set OVERRIDE if the old symbol is
1049 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1050 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1051 to change. By OK to change, we mean that we shouldn't warn if the
1052 type or size does change. */
1055 _bfd_elf_merge_symbol (bfd
*abfd
,
1056 struct bfd_link_info
*info
,
1058 Elf_Internal_Sym
*sym
,
1061 struct elf_link_hash_entry
**sym_hash
,
1064 unsigned int *pold_alignment
,
1067 bool *type_change_ok
,
1068 bool *size_change_ok
,
1071 asection
*sec
, *oldsec
;
1072 struct elf_link_hash_entry
*h
;
1073 struct elf_link_hash_entry
*hi
;
1074 struct elf_link_hash_entry
*flip
;
1077 bool newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1078 bool newweak
, oldweak
, newfunc
, oldfunc
;
1079 const struct elf_backend_data
*bed
;
1081 bool default_sym
= *matched
;
1087 bind
= ELF_ST_BIND (sym
->st_info
);
1089 if (! bfd_is_und_section (sec
))
1090 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
1092 h
= ((struct elf_link_hash_entry
*)
1093 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
1098 bed
= get_elf_backend_data (abfd
);
1100 /* NEW_VERSION is the symbol version of the new symbol. */
1101 if (h
->versioned
!= unversioned
)
1103 /* Symbol version is unknown or versioned. */
1104 new_version
= strrchr (name
, ELF_VER_CHR
);
1107 if (h
->versioned
== unknown
)
1109 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1110 h
->versioned
= versioned_hidden
;
1112 h
->versioned
= versioned
;
1115 if (new_version
[0] == '\0')
1119 h
->versioned
= unversioned
;
1124 /* For merging, we only care about real symbols. But we need to make
1125 sure that indirect symbol dynamic flags are updated. */
1127 while (h
->root
.type
== bfd_link_hash_indirect
1128 || h
->root
.type
== bfd_link_hash_warning
)
1129 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1133 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1137 /* OLD_HIDDEN is true if the existing symbol is only visible
1138 to the symbol with the same symbol version. NEW_HIDDEN is
1139 true if the new symbol is only visible to the symbol with
1140 the same symbol version. */
1141 bool old_hidden
= h
->versioned
== versioned_hidden
;
1142 bool new_hidden
= hi
->versioned
== versioned_hidden
;
1143 if (!old_hidden
&& !new_hidden
)
1144 /* The new symbol matches the existing symbol if both
1149 /* OLD_VERSION is the symbol version of the existing
1153 if (h
->versioned
>= versioned
)
1154 old_version
= strrchr (h
->root
.root
.string
,
1159 /* The new symbol matches the existing symbol if they
1160 have the same symbol version. */
1161 *matched
= (old_version
== new_version
1162 || (old_version
!= NULL
1163 && new_version
!= NULL
1164 && strcmp (old_version
, new_version
) == 0));
1169 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1174 switch (h
->root
.type
)
1179 case bfd_link_hash_undefined
:
1180 case bfd_link_hash_undefweak
:
1181 oldbfd
= h
->root
.u
.undef
.abfd
;
1184 case bfd_link_hash_defined
:
1185 case bfd_link_hash_defweak
:
1186 oldbfd
= h
->root
.u
.def
.section
->owner
;
1187 oldsec
= h
->root
.u
.def
.section
;
1190 case bfd_link_hash_common
:
1191 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1192 oldsec
= h
->root
.u
.c
.p
->section
;
1194 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1197 if (poldbfd
&& *poldbfd
== NULL
)
1200 /* Differentiate strong and weak symbols. */
1201 newweak
= bind
== STB_WEAK
;
1202 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1203 || h
->root
.type
== bfd_link_hash_undefweak
);
1205 *pold_weak
= oldweak
;
1207 /* We have to check it for every instance since the first few may be
1208 references and not all compilers emit symbol type for undefined
1210 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1212 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1213 respectively, is from a dynamic object. */
1215 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1217 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1218 syms and defined syms in dynamic libraries respectively.
1219 ref_dynamic on the other hand can be set for a symbol defined in
1220 a dynamic library, and def_dynamic may not be set; When the
1221 definition in a dynamic lib is overridden by a definition in the
1222 executable use of the symbol in the dynamic lib becomes a
1223 reference to the executable symbol. */
1226 if (bfd_is_und_section (sec
))
1228 if (bind
!= STB_WEAK
)
1230 h
->ref_dynamic_nonweak
= 1;
1231 hi
->ref_dynamic_nonweak
= 1;
1236 /* Update the existing symbol only if they match. */
1239 hi
->dynamic_def
= 1;
1243 /* If we just created the symbol, mark it as being an ELF symbol.
1244 Other than that, there is nothing to do--there is no merge issue
1245 with a newly defined symbol--so we just return. */
1247 if (h
->root
.type
== bfd_link_hash_new
)
1253 /* In cases involving weak versioned symbols, we may wind up trying
1254 to merge a symbol with itself. Catch that here, to avoid the
1255 confusion that results if we try to override a symbol with
1256 itself. The additional tests catch cases like
1257 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1258 dynamic object, which we do want to handle here. */
1260 && (newweak
|| oldweak
)
1261 && ((abfd
->flags
& DYNAMIC
) == 0
1262 || !h
->def_regular
))
1267 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1268 else if (oldsec
!= NULL
)
1270 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1271 indices used by MIPS ELF. */
1272 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1275 /* Handle a case where plugin_notice won't be called and thus won't
1276 set the non_ir_ref flags on the first pass over symbols. */
1278 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
)
1279 && newdyn
!= olddyn
)
1281 h
->root
.non_ir_ref_dynamic
= true;
1282 hi
->root
.non_ir_ref_dynamic
= true;
1285 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1286 respectively, appear to be a definition rather than reference. */
1288 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1290 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1291 && h
->root
.type
!= bfd_link_hash_undefweak
1292 && h
->root
.type
!= bfd_link_hash_common
);
1294 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1295 respectively, appear to be a function. */
1297 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1298 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1300 oldfunc
= (h
->type
!= STT_NOTYPE
1301 && bed
->is_function_type (h
->type
));
1303 if (!(newfunc
&& oldfunc
)
1304 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1305 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1306 && h
->type
!= STT_NOTYPE
1307 && (newdef
|| bfd_is_com_section (sec
))
1308 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1310 /* If creating a default indirect symbol ("foo" or "foo@") from
1311 a dynamic versioned definition ("foo@@") skip doing so if
1312 there is an existing regular definition with a different
1313 type. We don't want, for example, a "time" variable in the
1314 executable overriding a "time" function in a shared library. */
1322 /* When adding a symbol from a regular object file after we have
1323 created indirect symbols, undo the indirection and any
1330 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1331 h
->forced_local
= 0;
1335 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1337 h
->root
.type
= bfd_link_hash_undefined
;
1338 h
->root
.u
.undef
.abfd
= abfd
;
1342 h
->root
.type
= bfd_link_hash_new
;
1343 h
->root
.u
.undef
.abfd
= NULL
;
1349 /* Check TLS symbols. We don't check undefined symbols introduced
1350 by "ld -u" which have no type (and oldbfd NULL), and we don't
1351 check symbols from plugins because they also have no type. */
1353 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1354 && (abfd
->flags
& BFD_PLUGIN
) == 0
1355 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1356 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1360 asection
*ntsec
, *tsec
;
1362 if (h
->type
== STT_TLS
)
1383 /* xgettext:c-format */
1384 (_("%s: TLS definition in %pB section %pA "
1385 "mismatches non-TLS definition in %pB section %pA"),
1386 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1387 else if (!tdef
&& !ntdef
)
1389 /* xgettext:c-format */
1390 (_("%s: TLS reference in %pB "
1391 "mismatches non-TLS reference in %pB"),
1392 h
->root
.root
.string
, tbfd
, ntbfd
);
1395 /* xgettext:c-format */
1396 (_("%s: TLS definition in %pB section %pA "
1397 "mismatches non-TLS reference in %pB"),
1398 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1401 /* xgettext:c-format */
1402 (_("%s: TLS reference in %pB "
1403 "mismatches non-TLS definition in %pB section %pA"),
1404 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1406 bfd_set_error (bfd_error_bad_value
);
1410 /* If the old symbol has non-default visibility, we ignore the new
1411 definition from a dynamic object. */
1413 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1414 && !bfd_is_und_section (sec
))
1417 /* Make sure this symbol is dynamic. */
1419 hi
->ref_dynamic
= 1;
1420 /* A protected symbol has external availability. Make sure it is
1421 recorded as dynamic.
1423 FIXME: Should we check type and size for protected symbol? */
1424 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1425 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1430 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1433 /* If the new symbol with non-default visibility comes from a
1434 relocatable file and the old definition comes from a dynamic
1435 object, we remove the old definition. */
1436 if (hi
->root
.type
== bfd_link_hash_indirect
)
1438 /* Handle the case where the old dynamic definition is
1439 default versioned. We need to copy the symbol info from
1440 the symbol with default version to the normal one if it
1441 was referenced before. */
1444 hi
->root
.type
= h
->root
.type
;
1445 h
->root
.type
= bfd_link_hash_indirect
;
1446 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1448 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1449 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1451 /* If the new symbol is hidden or internal, completely undo
1452 any dynamic link state. */
1453 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1454 h
->forced_local
= 0;
1461 /* FIXME: Should we check type and size for protected symbol? */
1471 /* If the old symbol was undefined before, then it will still be
1472 on the undefs list. If the new symbol is undefined or
1473 common, we can't make it bfd_link_hash_new here, because new
1474 undefined or common symbols will be added to the undefs list
1475 by _bfd_generic_link_add_one_symbol. Symbols may not be
1476 added twice to the undefs list. Also, if the new symbol is
1477 undefweak then we don't want to lose the strong undef. */
1478 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1480 h
->root
.type
= bfd_link_hash_undefined
;
1481 h
->root
.u
.undef
.abfd
= abfd
;
1485 h
->root
.type
= bfd_link_hash_new
;
1486 h
->root
.u
.undef
.abfd
= NULL
;
1489 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1491 /* If the new symbol is hidden or internal, completely undo
1492 any dynamic link state. */
1493 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1494 h
->forced_local
= 0;
1500 /* FIXME: Should we check type and size for protected symbol? */
1506 /* If a new weak symbol definition comes from a regular file and the
1507 old symbol comes from a dynamic library, we treat the new one as
1508 strong. Similarly, an old weak symbol definition from a regular
1509 file is treated as strong when the new symbol comes from a dynamic
1510 library. Further, an old weak symbol from a dynamic library is
1511 treated as strong if the new symbol is from a dynamic library.
1512 This reflects the way glibc's ld.so works.
1514 Also allow a weak symbol to override a linker script symbol
1515 defined by an early pass over the script. This is done so the
1516 linker knows the symbol is defined in an object file, for the
1517 DEFINED script function.
1519 Do this before setting *type_change_ok or *size_change_ok so that
1520 we warn properly when dynamic library symbols are overridden. */
1522 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1524 if (olddef
&& newdyn
)
1527 /* Allow changes between different types of function symbol. */
1528 if (newfunc
&& oldfunc
)
1529 *type_change_ok
= true;
1531 /* It's OK to change the type if either the existing symbol or the
1532 new symbol is weak. A type change is also OK if the old symbol
1533 is undefined and the new symbol is defined. */
1538 && h
->root
.type
== bfd_link_hash_undefined
))
1539 *type_change_ok
= true;
1541 /* It's OK to change the size if either the existing symbol or the
1542 new symbol is weak, or if the old symbol is undefined. */
1545 || h
->root
.type
== bfd_link_hash_undefined
)
1546 *size_change_ok
= true;
1548 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1549 symbol, respectively, appears to be a common symbol in a dynamic
1550 object. If a symbol appears in an uninitialized section, and is
1551 not weak, and is not a function, then it may be a common symbol
1552 which was resolved when the dynamic object was created. We want
1553 to treat such symbols specially, because they raise special
1554 considerations when setting the symbol size: if the symbol
1555 appears as a common symbol in a regular object, and the size in
1556 the regular object is larger, we must make sure that we use the
1557 larger size. This problematic case can always be avoided in C,
1558 but it must be handled correctly when using Fortran shared
1561 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1562 likewise for OLDDYNCOMMON and OLDDEF.
1564 Note that this test is just a heuristic, and that it is quite
1565 possible to have an uninitialized symbol in a shared object which
1566 is really a definition, rather than a common symbol. This could
1567 lead to some minor confusion when the symbol really is a common
1568 symbol in some regular object. However, I think it will be
1574 && (sec
->flags
& SEC_ALLOC
) != 0
1575 && (sec
->flags
& SEC_LOAD
) == 0
1578 newdyncommon
= true;
1580 newdyncommon
= false;
1584 && h
->root
.type
== bfd_link_hash_defined
1586 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1587 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1590 olddyncommon
= true;
1592 olddyncommon
= false;
1594 /* We now know everything about the old and new symbols. We ask the
1595 backend to check if we can merge them. */
1596 if (bed
->merge_symbol
!= NULL
)
1598 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1603 /* There are multiple definitions of a normal symbol. Skip the
1604 default symbol as well as definition from an IR object. */
1605 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1606 && !default_sym
&& h
->def_regular
1608 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1609 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1611 /* Handle a multiple definition. */
1612 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1613 abfd
, sec
, *pvalue
);
1618 /* If both the old and the new symbols look like common symbols in a
1619 dynamic object, set the size of the symbol to the larger of the
1624 && sym
->st_size
!= h
->size
)
1626 /* Since we think we have two common symbols, issue a multiple
1627 common warning if desired. Note that we only warn if the
1628 size is different. If the size is the same, we simply let
1629 the old symbol override the new one as normally happens with
1630 symbols defined in dynamic objects. */
1632 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1633 bfd_link_hash_common
, sym
->st_size
);
1634 if (sym
->st_size
> h
->size
)
1635 h
->size
= sym
->st_size
;
1637 *size_change_ok
= true;
1640 /* If we are looking at a dynamic object, and we have found a
1641 definition, we need to see if the symbol was already defined by
1642 some other object. If so, we want to use the existing
1643 definition, and we do not want to report a multiple symbol
1644 definition error; we do this by clobbering *PSEC to be
1645 bfd_und_section_ptr.
1647 We treat a common symbol as a definition if the symbol in the
1648 shared library is a function, since common symbols always
1649 represent variables; this can cause confusion in principle, but
1650 any such confusion would seem to indicate an erroneous program or
1651 shared library. We also permit a common symbol in a regular
1652 object to override a weak symbol in a shared object. */
1657 || (h
->root
.type
== bfd_link_hash_common
1658 && (newweak
|| newfunc
))))
1662 newdyncommon
= false;
1664 *psec
= sec
= bfd_und_section_ptr
;
1665 *size_change_ok
= true;
1667 /* If we get here when the old symbol is a common symbol, then
1668 we are explicitly letting it override a weak symbol or
1669 function in a dynamic object, and we don't want to warn about
1670 a type change. If the old symbol is a defined symbol, a type
1671 change warning may still be appropriate. */
1673 if (h
->root
.type
== bfd_link_hash_common
)
1674 *type_change_ok
= true;
1677 /* Handle the special case of an old common symbol merging with a
1678 new symbol which looks like a common symbol in a shared object.
1679 We change *PSEC and *PVALUE to make the new symbol look like a
1680 common symbol, and let _bfd_generic_link_add_one_symbol do the
1684 && h
->root
.type
== bfd_link_hash_common
)
1688 newdyncommon
= false;
1689 *pvalue
= sym
->st_size
;
1690 *psec
= sec
= bed
->common_section (oldsec
);
1691 *size_change_ok
= true;
1694 /* Skip weak definitions of symbols that are already defined. */
1695 if (newdef
&& olddef
&& newweak
)
1697 /* Don't skip new non-IR weak syms. */
1698 if (!(oldbfd
!= NULL
1699 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1700 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1706 /* Merge st_other. If the symbol already has a dynamic index,
1707 but visibility says it should not be visible, turn it into a
1709 elf_merge_st_other (abfd
, h
, sym
->st_other
, sec
, newdef
, newdyn
);
1710 if (h
->dynindx
!= -1)
1711 switch (ELF_ST_VISIBILITY (h
->other
))
1715 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1720 /* If the old symbol is from a dynamic object, and the new symbol is
1721 a definition which is not from a dynamic object, then the new
1722 symbol overrides the old symbol. Symbols from regular files
1723 always take precedence over symbols from dynamic objects, even if
1724 they are defined after the dynamic object in the link.
1726 As above, we again permit a common symbol in a regular object to
1727 override a definition in a shared object if the shared object
1728 symbol is a function or is weak. */
1733 || (bfd_is_com_section (sec
)
1734 && (oldweak
|| oldfunc
)))
1739 /* Change the hash table entry to undefined, and let
1740 _bfd_generic_link_add_one_symbol do the right thing with the
1743 h
->root
.type
= bfd_link_hash_undefined
;
1744 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1745 *size_change_ok
= true;
1748 olddyncommon
= false;
1750 /* We again permit a type change when a common symbol may be
1751 overriding a function. */
1753 if (bfd_is_com_section (sec
))
1757 /* If a common symbol overrides a function, make sure
1758 that it isn't defined dynamically nor has type
1761 h
->type
= STT_NOTYPE
;
1763 *type_change_ok
= true;
1766 if (hi
->root
.type
== bfd_link_hash_indirect
)
1769 /* This union may have been set to be non-NULL when this symbol
1770 was seen in a dynamic object. We must force the union to be
1771 NULL, so that it is correct for a regular symbol. */
1772 h
->verinfo
.vertree
= NULL
;
1775 /* Handle the special case of a new common symbol merging with an
1776 old symbol that looks like it might be a common symbol defined in
1777 a shared object. Note that we have already handled the case in
1778 which a new common symbol should simply override the definition
1779 in the shared library. */
1782 && bfd_is_com_section (sec
)
1785 /* It would be best if we could set the hash table entry to a
1786 common symbol, but we don't know what to use for the section
1787 or the alignment. */
1788 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1789 bfd_link_hash_common
, sym
->st_size
);
1791 /* If the presumed common symbol in the dynamic object is
1792 larger, pretend that the new symbol has its size. */
1794 if (h
->size
> *pvalue
)
1797 /* We need to remember the alignment required by the symbol
1798 in the dynamic object. */
1799 BFD_ASSERT (pold_alignment
);
1800 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1803 olddyncommon
= false;
1805 h
->root
.type
= bfd_link_hash_undefined
;
1806 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1808 *size_change_ok
= true;
1809 *type_change_ok
= true;
1811 if (hi
->root
.type
== bfd_link_hash_indirect
)
1814 h
->verinfo
.vertree
= NULL
;
1819 /* Handle the case where we had a versioned symbol in a dynamic
1820 library and now find a definition in a normal object. In this
1821 case, we make the versioned symbol point to the normal one. */
1822 flip
->root
.type
= h
->root
.type
;
1823 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1824 h
->root
.type
= bfd_link_hash_indirect
;
1825 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1826 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1830 flip
->ref_dynamic
= 1;
1837 /* This function is called to create an indirect symbol from the
1838 default for the symbol with the default version if needed. The
1839 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1840 set DYNSYM if the new indirect symbol is dynamic. */
1843 _bfd_elf_add_default_symbol (bfd
*abfd
,
1844 struct bfd_link_info
*info
,
1845 struct elf_link_hash_entry
*h
,
1847 Elf_Internal_Sym
*sym
,
1853 bool type_change_ok
;
1854 bool size_change_ok
;
1857 struct elf_link_hash_entry
*hi
;
1858 struct bfd_link_hash_entry
*bh
;
1859 const struct elf_backend_data
*bed
;
1864 size_t len
, shortlen
;
1868 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1871 /* If this symbol has a version, and it is the default version, we
1872 create an indirect symbol from the default name to the fully
1873 decorated name. This will cause external references which do not
1874 specify a version to be bound to this version of the symbol. */
1875 p
= strchr (name
, ELF_VER_CHR
);
1876 if (h
->versioned
== unknown
)
1880 h
->versioned
= unversioned
;
1885 if (p
[1] != ELF_VER_CHR
)
1887 h
->versioned
= versioned_hidden
;
1891 h
->versioned
= versioned
;
1896 /* PR ld/19073: We may see an unversioned definition after the
1902 bed
= get_elf_backend_data (abfd
);
1903 collect
= bed
->collect
;
1904 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1906 shortlen
= p
- name
;
1907 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1908 if (shortname
== NULL
)
1910 memcpy (shortname
, name
, shortlen
);
1911 shortname
[shortlen
] = '\0';
1913 /* We are going to create a new symbol. Merge it with any existing
1914 symbol with this name. For the purposes of the merge, act as
1915 though we were defining the symbol we just defined, although we
1916 actually going to define an indirect symbol. */
1917 type_change_ok
= false;
1918 size_change_ok
= false;
1921 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1922 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1923 &type_change_ok
, &size_change_ok
, &matched
))
1929 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1931 /* If the undecorated symbol will have a version added by a
1932 script different to H, then don't indirect to/from the
1933 undecorated symbol. This isn't ideal because we may not yet
1934 have seen symbol versions, if given by a script on the
1935 command line rather than via --version-script. */
1936 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1941 = bfd_find_version_for_sym (info
->version_info
,
1942 hi
->root
.root
.string
, &hide
);
1943 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1945 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
1949 if (hi
->verinfo
.vertree
!= NULL
1950 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1956 /* Add the default symbol if not performing a relocatable link. */
1957 if (! bfd_link_relocatable (info
))
1960 if (bh
->type
== bfd_link_hash_defined
1961 && bh
->u
.def
.section
->owner
!= NULL
1962 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1964 /* Mark the previous definition from IR object as
1965 undefined so that the generic linker will override
1967 bh
->type
= bfd_link_hash_undefined
;
1968 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1970 if (! (_bfd_generic_link_add_one_symbol
1971 (info
, abfd
, shortname
, BSF_INDIRECT
,
1972 bfd_ind_section_ptr
,
1973 0, name
, false, collect
, &bh
)))
1975 hi
= (struct elf_link_hash_entry
*) bh
;
1980 /* In this case the symbol named SHORTNAME is overriding the
1981 indirect symbol we want to add. We were planning on making
1982 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1983 is the name without a version. NAME is the fully versioned
1984 name, and it is the default version.
1986 Overriding means that we already saw a definition for the
1987 symbol SHORTNAME in a regular object, and it is overriding
1988 the symbol defined in the dynamic object.
1990 When this happens, we actually want to change NAME, the
1991 symbol we just added, to refer to SHORTNAME. This will cause
1992 references to NAME in the shared object to become references
1993 to SHORTNAME in the regular object. This is what we expect
1994 when we override a function in a shared object: that the
1995 references in the shared object will be mapped to the
1996 definition in the regular object. */
1998 while (hi
->root
.type
== bfd_link_hash_indirect
1999 || hi
->root
.type
== bfd_link_hash_warning
)
2000 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2002 h
->root
.type
= bfd_link_hash_indirect
;
2003 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
2007 hi
->ref_dynamic
= 1;
2011 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
2016 /* Now set HI to H, so that the following code will set the
2017 other fields correctly. */
2021 /* Check if HI is a warning symbol. */
2022 if (hi
->root
.type
== bfd_link_hash_warning
)
2023 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2025 /* If there is a duplicate definition somewhere, then HI may not
2026 point to an indirect symbol. We will have reported an error to
2027 the user in that case. */
2029 if (hi
->root
.type
== bfd_link_hash_indirect
)
2031 struct elf_link_hash_entry
*ht
;
2033 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2034 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2036 /* If we first saw a reference to SHORTNAME with non-default
2037 visibility, merge that visibility to the @@VER symbol. */
2038 elf_merge_st_other (abfd
, ht
, hi
->other
, sec
, true, dynamic
);
2040 /* A reference to the SHORTNAME symbol from a dynamic library
2041 will be satisfied by the versioned symbol at runtime. In
2042 effect, we have a reference to the versioned symbol. */
2043 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2044 hi
->dynamic_def
|= ht
->dynamic_def
;
2046 /* See if the new flags lead us to realize that the symbol must
2052 if (! bfd_link_executable (info
)
2059 if (hi
->ref_regular
)
2065 /* We also need to define an indirection from the nondefault version
2069 len
= strlen (name
);
2070 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2071 if (shortname
== NULL
)
2073 memcpy (shortname
, name
, shortlen
);
2074 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2076 /* Once again, merge with any existing symbol. */
2077 type_change_ok
= false;
2078 size_change_ok
= false;
2080 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2081 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2082 &type_change_ok
, &size_change_ok
, &matched
))
2088 && h
->root
.type
== bfd_link_hash_defweak
2089 && hi
->root
.type
== bfd_link_hash_defined
)
2091 /* We are handling a weak sym@@ver and attempting to define
2092 a weak sym@ver, but _bfd_elf_merge_symbol said to skip the
2093 new weak sym@ver because there is already a strong sym@ver.
2094 However, sym@ver and sym@@ver are really the same symbol.
2095 The existing strong sym@ver ought to override sym@@ver. */
2096 h
->root
.type
= bfd_link_hash_defined
;
2097 h
->root
.u
.def
.section
= hi
->root
.u
.def
.section
;
2098 h
->root
.u
.def
.value
= hi
->root
.u
.def
.value
;
2099 hi
->root
.type
= bfd_link_hash_indirect
;
2100 hi
->root
.u
.i
.link
= &h
->root
;
2107 /* Here SHORTNAME is a versioned name, so we don't expect to see
2108 the type of override we do in the case above unless it is
2109 overridden by a versioned definition. */
2110 if (hi
->root
.type
!= bfd_link_hash_defined
2111 && hi
->root
.type
!= bfd_link_hash_defweak
)
2113 /* xgettext:c-format */
2114 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2121 if (! (_bfd_generic_link_add_one_symbol
2122 (info
, abfd
, shortname
, BSF_INDIRECT
,
2123 bfd_ind_section_ptr
, 0, name
, false, collect
, &bh
)))
2125 hi
= (struct elf_link_hash_entry
*) bh
;
2128 /* If there is a duplicate definition somewhere, then HI may not
2129 point to an indirect symbol. We will have reported an error
2130 to the user in that case. */
2131 if (hi
->root
.type
== bfd_link_hash_indirect
)
2133 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2134 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2135 hi
->dynamic_def
|= h
->dynamic_def
;
2137 /* If we first saw a reference to @VER symbol with
2138 non-default visibility, merge that visibility to the
2140 elf_merge_st_other (abfd
, h
, hi
->other
, sec
, true, dynamic
);
2142 /* See if the new flags lead us to realize that the symbol
2148 if (! bfd_link_executable (info
)
2154 if (hi
->ref_regular
)
2163 /* This routine is used to export all defined symbols into the dynamic
2164 symbol table. It is called via elf_link_hash_traverse. */
2167 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2169 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2171 /* Ignore indirect symbols. These are added by the versioning code. */
2172 if (h
->root
.type
== bfd_link_hash_indirect
)
2175 /* Ignore this if we won't export it. */
2176 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2179 if (h
->dynindx
== -1
2180 && (h
->def_regular
|| h
->ref_regular
)
2181 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2182 h
->root
.root
.string
))
2184 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2194 /* Look through the symbols which are defined in other shared
2195 libraries and referenced here. Update the list of version
2196 dependencies. This will be put into the .gnu.version_r section.
2197 This function is called via elf_link_hash_traverse. */
2200 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2203 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2204 Elf_Internal_Verneed
*t
;
2205 Elf_Internal_Vernaux
*a
;
2208 /* We only care about symbols defined in shared objects with version
2213 || h
->verinfo
.verdef
== NULL
2214 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2215 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2218 /* See if we already know about this version. */
2219 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2223 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2226 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2227 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2233 /* This is a new version. Add it to tree we are building. */
2238 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2241 rinfo
->failed
= true;
2245 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2246 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2247 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2251 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2254 rinfo
->failed
= true;
2258 /* Note that we are copying a string pointer here, and testing it
2259 above. If bfd_elf_string_from_elf_section is ever changed to
2260 discard the string data when low in memory, this will have to be
2262 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2264 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2265 a
->vna_nextptr
= t
->vn_auxptr
;
2267 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2270 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2277 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2278 hidden. Set *T_P to NULL if there is no match. */
2281 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2282 struct elf_link_hash_entry
*h
,
2283 const char *version_p
,
2284 struct bfd_elf_version_tree
**t_p
,
2287 struct bfd_elf_version_tree
*t
;
2289 /* Look for the version. If we find it, it is no longer weak. */
2290 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2292 if (strcmp (t
->name
, version_p
) == 0)
2296 struct bfd_elf_version_expr
*d
;
2298 len
= version_p
- h
->root
.root
.string
;
2299 alc
= (char *) bfd_malloc (len
);
2302 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2303 alc
[len
- 1] = '\0';
2304 if (alc
[len
- 2] == ELF_VER_CHR
)
2305 alc
[len
- 2] = '\0';
2307 h
->verinfo
.vertree
= t
;
2311 if (t
->globals
.list
!= NULL
)
2312 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2314 /* See if there is anything to force this symbol to
2316 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2318 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2321 && ! info
->export_dynamic
)
2335 /* Return TRUE if the symbol H is hidden by version script. */
2338 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2339 struct elf_link_hash_entry
*h
)
2343 const struct elf_backend_data
*bed
2344 = get_elf_backend_data (info
->output_bfd
);
2346 /* Version script only hides symbols defined in regular objects. */
2347 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2350 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2351 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2353 struct bfd_elf_version_tree
*t
;
2356 if (*p
== ELF_VER_CHR
)
2360 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2364 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2369 /* If we don't have a version for this symbol, see if we can find
2371 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2374 = bfd_find_version_for_sym (info
->version_info
,
2375 h
->root
.root
.string
, &hide
);
2376 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2378 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2386 /* Figure out appropriate versions for all the symbols. We may not
2387 have the version number script until we have read all of the input
2388 files, so until that point we don't know which symbols should be
2389 local. This function is called via elf_link_hash_traverse. */
2392 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2394 struct elf_info_failed
*sinfo
;
2395 struct bfd_link_info
*info
;
2396 const struct elf_backend_data
*bed
;
2397 struct elf_info_failed eif
;
2401 sinfo
= (struct elf_info_failed
*) data
;
2404 /* Fix the symbol flags. */
2407 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2410 sinfo
->failed
= true;
2414 bed
= get_elf_backend_data (info
->output_bfd
);
2416 /* We only need version numbers for symbols defined in regular
2418 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2420 /* Hide symbols defined in discarded input sections. */
2421 if ((h
->root
.type
== bfd_link_hash_defined
2422 || h
->root
.type
== bfd_link_hash_defweak
)
2423 && discarded_section (h
->root
.u
.def
.section
))
2424 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2429 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2430 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2432 struct bfd_elf_version_tree
*t
;
2435 if (*p
== ELF_VER_CHR
)
2438 /* If there is no version string, we can just return out. */
2442 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2444 sinfo
->failed
= true;
2449 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2451 /* If we are building an application, we need to create a
2452 version node for this version. */
2453 if (t
== NULL
&& bfd_link_executable (info
))
2455 struct bfd_elf_version_tree
**pp
;
2458 /* If we aren't going to export this symbol, we don't need
2459 to worry about it. */
2460 if (h
->dynindx
== -1)
2463 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2467 sinfo
->failed
= true;
2472 t
->name_indx
= (unsigned int) -1;
2476 /* Don't count anonymous version tag. */
2477 if (sinfo
->info
->version_info
!= NULL
2478 && sinfo
->info
->version_info
->vernum
== 0)
2480 for (pp
= &sinfo
->info
->version_info
;
2484 t
->vernum
= version_index
;
2488 h
->verinfo
.vertree
= t
;
2492 /* We could not find the version for a symbol when
2493 generating a shared archive. Return an error. */
2495 /* xgettext:c-format */
2496 (_("%pB: version node not found for symbol %s"),
2497 info
->output_bfd
, h
->root
.root
.string
);
2498 bfd_set_error (bfd_error_bad_value
);
2499 sinfo
->failed
= true;
2504 /* If we don't have a version for this symbol, see if we can find
2507 && h
->verinfo
.vertree
== NULL
2508 && sinfo
->info
->version_info
!= NULL
)
2511 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2512 h
->root
.root
.string
, &hide
);
2513 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2514 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2520 /* Read and swap the relocs from the section indicated by SHDR. This
2521 may be either a REL or a RELA section. The relocations are
2522 translated into RELA relocations and stored in INTERNAL_RELOCS,
2523 which should have already been allocated to contain enough space.
2524 The EXTERNAL_RELOCS are a buffer where the external form of the
2525 relocations should be stored.
2527 Returns FALSE if something goes wrong. */
2530 elf_link_read_relocs_from_section (bfd
*abfd
,
2532 Elf_Internal_Shdr
*shdr
,
2533 void *external_relocs
,
2534 Elf_Internal_Rela
*internal_relocs
)
2536 const struct elf_backend_data
*bed
;
2537 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2538 const bfd_byte
*erela
;
2539 const bfd_byte
*erelaend
;
2540 Elf_Internal_Rela
*irela
;
2541 Elf_Internal_Shdr
*symtab_hdr
;
2544 /* Position ourselves at the start of the section. */
2545 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2548 /* Read the relocations. */
2549 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2552 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2553 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2555 bed
= get_elf_backend_data (abfd
);
2557 /* Convert the external relocations to the internal format. */
2558 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2559 swap_in
= bed
->s
->swap_reloc_in
;
2560 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2561 swap_in
= bed
->s
->swap_reloca_in
;
2564 bfd_set_error (bfd_error_wrong_format
);
2568 erela
= (const bfd_byte
*) external_relocs
;
2569 /* Setting erelaend like this and comparing with <= handles case of
2570 a fuzzed object with sh_size not a multiple of sh_entsize. */
2571 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2572 irela
= internal_relocs
;
2573 while (erela
<= erelaend
)
2577 (*swap_in
) (abfd
, erela
, irela
);
2578 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2579 if (bed
->s
->arch_size
== 64)
2583 if ((size_t) r_symndx
>= nsyms
)
2586 /* xgettext:c-format */
2587 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2588 " for offset %#" PRIx64
" in section `%pA'"),
2589 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2590 (uint64_t) irela
->r_offset
, sec
);
2591 bfd_set_error (bfd_error_bad_value
);
2595 else if (r_symndx
!= STN_UNDEF
)
2598 /* xgettext:c-format */
2599 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2600 " for offset %#" PRIx64
" in section `%pA'"
2601 " when the object file has no symbol table"),
2602 abfd
, (uint64_t) r_symndx
,
2603 (uint64_t) irela
->r_offset
, sec
);
2604 bfd_set_error (bfd_error_bad_value
);
2607 irela
+= bed
->s
->int_rels_per_ext_rel
;
2608 erela
+= shdr
->sh_entsize
;
2614 /* Read and swap the relocs for a section O. They may have been
2615 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2616 not NULL, they are used as buffers to read into. They are known to
2617 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2618 the return value is allocated using either malloc or bfd_alloc,
2619 according to the KEEP_MEMORY argument. If O has two relocation
2620 sections (both REL and RELA relocations), then the REL_HDR
2621 relocations will appear first in INTERNAL_RELOCS, followed by the
2622 RELA_HDR relocations. */
2625 _bfd_elf_link_read_relocs (bfd
*abfd
,
2627 void *external_relocs
,
2628 Elf_Internal_Rela
*internal_relocs
,
2631 void *alloc1
= NULL
;
2632 Elf_Internal_Rela
*alloc2
= NULL
;
2633 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2634 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2635 Elf_Internal_Rela
*internal_rela_relocs
;
2637 if (esdo
->relocs
!= NULL
)
2638 return esdo
->relocs
;
2640 if (o
->reloc_count
== 0)
2643 if (internal_relocs
== NULL
)
2647 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2649 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2651 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2652 if (internal_relocs
== NULL
)
2656 if (external_relocs
== NULL
)
2658 bfd_size_type size
= 0;
2661 size
+= esdo
->rel
.hdr
->sh_size
;
2663 size
+= esdo
->rela
.hdr
->sh_size
;
2665 alloc1
= bfd_malloc (size
);
2668 external_relocs
= alloc1
;
2671 internal_rela_relocs
= internal_relocs
;
2674 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2678 external_relocs
= (((bfd_byte
*) external_relocs
)
2679 + esdo
->rel
.hdr
->sh_size
);
2680 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2681 * bed
->s
->int_rels_per_ext_rel
);
2685 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2687 internal_rela_relocs
)))
2690 /* Cache the results for next time, if we can. */
2692 esdo
->relocs
= internal_relocs
;
2696 /* Don't free alloc2, since if it was allocated we are passing it
2697 back (under the name of internal_relocs). */
2699 return internal_relocs
;
2706 bfd_release (abfd
, alloc2
);
2713 /* Compute the size of, and allocate space for, REL_HDR which is the
2714 section header for a section containing relocations for O. */
2717 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2718 struct bfd_elf_section_reloc_data
*reldata
)
2720 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2722 /* That allows us to calculate the size of the section. */
2723 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2725 /* The contents field must last into write_object_contents, so we
2726 allocate it with bfd_alloc rather than malloc. Also since we
2727 cannot be sure that the contents will actually be filled in,
2728 we zero the allocated space. */
2729 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2730 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2733 if (reldata
->hashes
== NULL
&& reldata
->count
)
2735 struct elf_link_hash_entry
**p
;
2737 p
= ((struct elf_link_hash_entry
**)
2738 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2742 reldata
->hashes
= p
;
2748 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2749 originated from the section given by INPUT_REL_HDR) to the
2753 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2754 asection
*input_section
,
2755 Elf_Internal_Shdr
*input_rel_hdr
,
2756 Elf_Internal_Rela
*internal_relocs
,
2757 struct elf_link_hash_entry
**rel_hash
2760 Elf_Internal_Rela
*irela
;
2761 Elf_Internal_Rela
*irelaend
;
2763 struct bfd_elf_section_reloc_data
*output_reldata
;
2764 asection
*output_section
;
2765 const struct elf_backend_data
*bed
;
2766 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2767 struct bfd_elf_section_data
*esdo
;
2769 output_section
= input_section
->output_section
;
2771 bed
= get_elf_backend_data (output_bfd
);
2772 esdo
= elf_section_data (output_section
);
2773 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2775 output_reldata
= &esdo
->rel
;
2776 swap_out
= bed
->s
->swap_reloc_out
;
2778 else if (esdo
->rela
.hdr
2779 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2781 output_reldata
= &esdo
->rela
;
2782 swap_out
= bed
->s
->swap_reloca_out
;
2787 /* xgettext:c-format */
2788 (_("%pB: relocation size mismatch in %pB section %pA"),
2789 output_bfd
, input_section
->owner
, input_section
);
2790 bfd_set_error (bfd_error_wrong_format
);
2794 erel
= output_reldata
->hdr
->contents
;
2795 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2796 irela
= internal_relocs
;
2797 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2798 * bed
->s
->int_rels_per_ext_rel
);
2799 while (irela
< irelaend
)
2801 (*swap_out
) (output_bfd
, irela
, erel
);
2802 irela
+= bed
->s
->int_rels_per_ext_rel
;
2803 erel
+= input_rel_hdr
->sh_entsize
;
2806 /* Bump the counter, so that we know where to add the next set of
2808 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2813 /* Make weak undefined symbols in PIE dynamic. */
2816 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2817 struct elf_link_hash_entry
*h
)
2819 if (bfd_link_pie (info
)
2821 && h
->root
.type
== bfd_link_hash_undefweak
)
2822 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2827 /* Fix up the flags for a symbol. This handles various cases which
2828 can only be fixed after all the input files are seen. This is
2829 currently called by both adjust_dynamic_symbol and
2830 assign_sym_version, which is unnecessary but perhaps more robust in
2831 the face of future changes. */
2834 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2835 struct elf_info_failed
*eif
)
2837 const struct elf_backend_data
*bed
;
2839 /* If this symbol was mentioned in a non-ELF file, try to set
2840 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2841 permit a non-ELF file to correctly refer to a symbol defined in
2842 an ELF dynamic object. */
2845 while (h
->root
.type
== bfd_link_hash_indirect
)
2846 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2848 if (h
->root
.type
!= bfd_link_hash_defined
2849 && h
->root
.type
!= bfd_link_hash_defweak
)
2852 h
->ref_regular_nonweak
= 1;
2856 if (h
->root
.u
.def
.section
->owner
!= NULL
2857 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2858 == bfd_target_elf_flavour
))
2861 h
->ref_regular_nonweak
= 1;
2867 if (h
->dynindx
== -1
2871 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2880 /* Unfortunately, NON_ELF is only correct if the symbol
2881 was first seen in a non-ELF file. Fortunately, if the symbol
2882 was first seen in an ELF file, we're probably OK unless the
2883 symbol was defined in a non-ELF file. Catch that case here.
2884 FIXME: We're still in trouble if the symbol was first seen in
2885 a dynamic object, and then later in a non-ELF regular object. */
2886 if ((h
->root
.type
== bfd_link_hash_defined
2887 || h
->root
.type
== bfd_link_hash_defweak
)
2889 && (h
->root
.u
.def
.section
->owner
!= NULL
2890 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2891 != bfd_target_elf_flavour
)
2892 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2893 && !h
->def_dynamic
)))
2897 /* Backend specific symbol fixup. */
2898 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2899 if (bed
->elf_backend_fixup_symbol
2900 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2903 /* If this is a final link, and the symbol was defined as a common
2904 symbol in a regular object file, and there was no definition in
2905 any dynamic object, then the linker will have allocated space for
2906 the symbol in a common section but the DEF_REGULAR
2907 flag will not have been set. */
2908 if (h
->root
.type
== bfd_link_hash_defined
2912 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2915 /* Symbols defined in discarded sections shouldn't be dynamic. */
2916 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2917 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2919 /* If a weak undefined symbol has non-default visibility, we also
2920 hide it from the dynamic linker. */
2921 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2922 && h
->root
.type
== bfd_link_hash_undefweak
)
2923 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2925 /* A hidden versioned symbol in executable should be forced local if
2926 it is is locally defined, not referenced by shared library and not
2928 else if (bfd_link_executable (eif
->info
)
2929 && h
->versioned
== versioned_hidden
2930 && !eif
->info
->export_dynamic
2934 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2936 /* If -Bsymbolic was used (which means to bind references to global
2937 symbols to the definition within the shared object), and this
2938 symbol was defined in a regular object, then it actually doesn't
2939 need a PLT entry. Likewise, if the symbol has non-default
2940 visibility. If the symbol has hidden or internal visibility, we
2941 will force it local. */
2942 else if (h
->needs_plt
2943 && bfd_link_pic (eif
->info
)
2944 && is_elf_hash_table (eif
->info
->hash
)
2945 && (SYMBOLIC_BIND (eif
->info
, h
)
2946 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2951 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2952 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2953 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2956 /* If this is a weak defined symbol in a dynamic object, and we know
2957 the real definition in the dynamic object, copy interesting flags
2958 over to the real definition. */
2959 if (h
->is_weakalias
)
2961 struct elf_link_hash_entry
*def
= weakdef (h
);
2963 /* If the real definition is defined by a regular object file,
2964 don't do anything special. See the longer description in
2965 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2966 bfd_link_hash_defined as it was when put on the alias list
2967 then it must have originally been a versioned symbol (for
2968 which a non-versioned indirect symbol is created) and later
2969 a definition for the non-versioned symbol is found. In that
2970 case the indirection is flipped with the versioned symbol
2971 becoming an indirect pointing at the non-versioned symbol.
2972 Thus, not an alias any more. */
2973 if (def
->def_regular
2974 || def
->root
.type
!= bfd_link_hash_defined
)
2977 while ((h
= h
->u
.alias
) != def
)
2978 h
->is_weakalias
= 0;
2982 while (h
->root
.type
== bfd_link_hash_indirect
)
2983 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2984 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2985 || h
->root
.type
== bfd_link_hash_defweak
);
2986 BFD_ASSERT (def
->def_dynamic
);
2987 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2994 /* Make the backend pick a good value for a dynamic symbol. This is
2995 called via elf_link_hash_traverse, and also calls itself
2999 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
3001 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3002 struct elf_link_hash_table
*htab
;
3003 const struct elf_backend_data
*bed
;
3005 if (! is_elf_hash_table (eif
->info
->hash
))
3008 /* Ignore indirect symbols. These are added by the versioning code. */
3009 if (h
->root
.type
== bfd_link_hash_indirect
)
3012 /* Fix the symbol flags. */
3013 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
3016 htab
= elf_hash_table (eif
->info
);
3017 bed
= get_elf_backend_data (htab
->dynobj
);
3019 if (h
->root
.type
== bfd_link_hash_undefweak
)
3021 if (eif
->info
->dynamic_undefined_weak
== 0)
3022 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3023 else if (eif
->info
->dynamic_undefined_weak
> 0
3025 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3026 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
3027 h
->root
.root
.string
))
3029 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3037 /* If this symbol does not require a PLT entry, and it is not
3038 defined by a dynamic object, or is not referenced by a regular
3039 object, ignore it. We do have to handle a weak defined symbol,
3040 even if no regular object refers to it, if we decided to add it
3041 to the dynamic symbol table. FIXME: Do we normally need to worry
3042 about symbols which are defined by one dynamic object and
3043 referenced by another one? */
3045 && h
->type
!= STT_GNU_IFUNC
3049 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3051 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3055 /* If we've already adjusted this symbol, don't do it again. This
3056 can happen via a recursive call. */
3057 if (h
->dynamic_adjusted
)
3060 /* Don't look at this symbol again. Note that we must set this
3061 after checking the above conditions, because we may look at a
3062 symbol once, decide not to do anything, and then get called
3063 recursively later after REF_REGULAR is set below. */
3064 h
->dynamic_adjusted
= 1;
3066 /* If this is a weak definition, and we know a real definition, and
3067 the real symbol is not itself defined by a regular object file,
3068 then get a good value for the real definition. We handle the
3069 real symbol first, for the convenience of the backend routine.
3071 Note that there is a confusing case here. If the real definition
3072 is defined by a regular object file, we don't get the real symbol
3073 from the dynamic object, but we do get the weak symbol. If the
3074 processor backend uses a COPY reloc, then if some routine in the
3075 dynamic object changes the real symbol, we will not see that
3076 change in the corresponding weak symbol. This is the way other
3077 ELF linkers work as well, and seems to be a result of the shared
3080 I will clarify this issue. Most SVR4 shared libraries define the
3081 variable _timezone and define timezone as a weak synonym. The
3082 tzset call changes _timezone. If you write
3083 extern int timezone;
3085 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3086 you might expect that, since timezone is a synonym for _timezone,
3087 the same number will print both times. However, if the processor
3088 backend uses a COPY reloc, then actually timezone will be copied
3089 into your process image, and, since you define _timezone
3090 yourself, _timezone will not. Thus timezone and _timezone will
3091 wind up at different memory locations. The tzset call will set
3092 _timezone, leaving timezone unchanged. */
3094 if (h
->is_weakalias
)
3096 struct elf_link_hash_entry
*def
= weakdef (h
);
3098 /* If we get to this point, there is an implicit reference to
3099 the alias by a regular object file via the weak symbol H. */
3100 def
->ref_regular
= 1;
3102 /* Ensure that the backend adjust_dynamic_symbol function sees
3103 the strong alias before H by recursively calling ourselves. */
3104 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3108 /* If a symbol has no type and no size and does not require a PLT
3109 entry, then we are probably about to do the wrong thing here: we
3110 are probably going to create a COPY reloc for an empty object.
3111 This case can arise when a shared object is built with assembly
3112 code, and the assembly code fails to set the symbol type. */
3114 && h
->type
== STT_NOTYPE
3117 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3118 h
->root
.root
.string
);
3120 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3129 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3133 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3134 struct elf_link_hash_entry
*h
,
3137 unsigned int power_of_two
;
3139 asection
*sec
= h
->root
.u
.def
.section
;
3141 /* The section alignment of the definition is the maximum alignment
3142 requirement of symbols defined in the section. Since we don't
3143 know the symbol alignment requirement, we start with the
3144 maximum alignment and check low bits of the symbol address
3145 for the minimum alignment. */
3146 power_of_two
= bfd_section_alignment (sec
);
3147 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3148 while ((h
->root
.u
.def
.value
& mask
) != 0)
3154 if (power_of_two
> bfd_section_alignment (dynbss
))
3156 /* Adjust the section alignment if needed. */
3157 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3161 /* We make sure that the symbol will be aligned properly. */
3162 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3164 /* Define the symbol as being at this point in DYNBSS. */
3165 h
->root
.u
.def
.section
= dynbss
;
3166 h
->root
.u
.def
.value
= dynbss
->size
;
3168 /* Increment the size of DYNBSS to make room for the symbol. */
3169 dynbss
->size
+= h
->size
;
3171 /* No error if extern_protected_data is true. */
3172 if (h
->protected_def
3173 && (!info
->extern_protected_data
3174 || (info
->extern_protected_data
< 0
3175 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3176 info
->callbacks
->einfo
3177 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3178 h
->root
.root
.string
);
3183 /* Adjust all external symbols pointing into SEC_MERGE sections
3184 to reflect the object merging within the sections. */
3187 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3191 if ((h
->root
.type
== bfd_link_hash_defined
3192 || h
->root
.type
== bfd_link_hash_defweak
)
3193 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3194 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3196 bfd
*output_bfd
= (bfd
*) data
;
3198 h
->root
.u
.def
.value
=
3199 _bfd_merged_section_offset (output_bfd
,
3200 &h
->root
.u
.def
.section
,
3201 elf_section_data (sec
)->sec_info
,
3202 h
->root
.u
.def
.value
);
3208 /* Returns false if the symbol referred to by H should be considered
3209 to resolve local to the current module, and true if it should be
3210 considered to bind dynamically. */
3213 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3214 struct bfd_link_info
*info
,
3215 bool not_local_protected
)
3217 bool binding_stays_local_p
;
3218 const struct elf_backend_data
*bed
;
3219 struct elf_link_hash_table
*hash_table
;
3224 while (h
->root
.type
== bfd_link_hash_indirect
3225 || h
->root
.type
== bfd_link_hash_warning
)
3226 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3228 /* If it was forced local, then clearly it's not dynamic. */
3229 if (h
->dynindx
== -1)
3231 if (h
->forced_local
)
3234 /* Identify the cases where name binding rules say that a
3235 visible symbol resolves locally. */
3236 binding_stays_local_p
= (bfd_link_executable (info
)
3237 || SYMBOLIC_BIND (info
, h
));
3239 switch (ELF_ST_VISIBILITY (h
->other
))
3246 hash_table
= elf_hash_table (info
);
3247 if (!is_elf_hash_table (&hash_table
->root
))
3250 bed
= get_elf_backend_data (hash_table
->dynobj
);
3252 /* Proper resolution for function pointer equality may require
3253 that these symbols perhaps be resolved dynamically, even though
3254 we should be resolving them to the current module. */
3255 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3256 binding_stays_local_p
= true;
3263 /* If it isn't defined locally, then clearly it's dynamic. */
3264 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3267 /* Otherwise, the symbol is dynamic if binding rules don't tell
3268 us that it remains local. */
3269 return !binding_stays_local_p
;
3272 /* Return true if the symbol referred to by H should be considered
3273 to resolve local to the current module, and false otherwise. Differs
3274 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3275 undefined symbols. The two functions are virtually identical except
3276 for the place where dynindx == -1 is tested. If that test is true,
3277 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3278 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3280 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3281 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3282 treatment of undefined weak symbols. For those that do not make
3283 undefined weak symbols dynamic, both functions may return false. */
3286 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3287 struct bfd_link_info
*info
,
3288 bool local_protected
)
3290 const struct elf_backend_data
*bed
;
3291 struct elf_link_hash_table
*hash_table
;
3293 /* If it's a local sym, of course we resolve locally. */
3297 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3298 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3299 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3302 /* Forced local symbols resolve locally. */
3303 if (h
->forced_local
)
3306 /* Common symbols that become definitions don't get the DEF_REGULAR
3307 flag set, so test it first, and don't bail out. */
3308 if (ELF_COMMON_DEF_P (h
))
3310 /* If we don't have a definition in a regular file, then we can't
3311 resolve locally. The sym is either undefined or dynamic. */
3312 else if (!h
->def_regular
)
3315 /* Non-dynamic symbols resolve locally. */
3316 if (h
->dynindx
== -1)
3319 /* At this point, we know the symbol is defined and dynamic. In an
3320 executable it must resolve locally, likewise when building symbolic
3321 shared libraries. */
3322 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3325 /* Now deal with defined dynamic symbols in shared libraries. Ones
3326 with default visibility might not resolve locally. */
3327 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3330 hash_table
= elf_hash_table (info
);
3331 if (!is_elf_hash_table (&hash_table
->root
))
3334 bed
= get_elf_backend_data (hash_table
->dynobj
);
3336 /* If extern_protected_data is false, STV_PROTECTED non-function
3337 symbols are local. */
3338 if ((!info
->extern_protected_data
3339 || (info
->extern_protected_data
< 0
3340 && !bed
->extern_protected_data
))
3341 && !bed
->is_function_type (h
->type
))
3344 /* Function pointer equality tests may require that STV_PROTECTED
3345 symbols be treated as dynamic symbols. If the address of a
3346 function not defined in an executable is set to that function's
3347 plt entry in the executable, then the address of the function in
3348 a shared library must also be the plt entry in the executable. */
3349 return local_protected
;
3352 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3353 aligned. Returns the first TLS output section. */
3355 struct bfd_section
*
3356 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3358 struct bfd_section
*sec
, *tls
;
3359 unsigned int align
= 0;
3361 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3362 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3366 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3367 if (sec
->alignment_power
> align
)
3368 align
= sec
->alignment_power
;
3370 elf_hash_table (info
)->tls_sec
= tls
;
3372 /* Ensure the alignment of the first section (usually .tdata) is the largest
3373 alignment, so that the tls segment starts aligned. */
3375 tls
->alignment_power
= align
;
3380 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3382 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3383 Elf_Internal_Sym
*sym
)
3385 const struct elf_backend_data
*bed
;
3387 /* Local symbols do not count, but target specific ones might. */
3388 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3389 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3392 bed
= get_elf_backend_data (abfd
);
3393 /* Function symbols do not count. */
3394 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3397 /* If the section is undefined, then so is the symbol. */
3398 if (sym
->st_shndx
== SHN_UNDEF
)
3401 /* If the symbol is defined in the common section, then
3402 it is a common definition and so does not count. */
3403 if (bed
->common_definition (sym
))
3406 /* If the symbol is in a target specific section then we
3407 must rely upon the backend to tell us what it is. */
3408 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3409 /* FIXME - this function is not coded yet:
3411 return _bfd_is_global_symbol_definition (abfd, sym);
3413 Instead for now assume that the definition is not global,
3414 Even if this is wrong, at least the linker will behave
3415 in the same way that it used to do. */
3421 /* Search the symbol table of the archive element of the archive ABFD
3422 whose archive map contains a mention of SYMDEF, and determine if
3423 the symbol is defined in this element. */
3425 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3427 Elf_Internal_Shdr
* hdr
;
3431 Elf_Internal_Sym
*isymbuf
;
3432 Elf_Internal_Sym
*isym
;
3433 Elf_Internal_Sym
*isymend
;
3436 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3440 if (! bfd_check_format (abfd
, bfd_object
))
3443 /* Select the appropriate symbol table. If we don't know if the
3444 object file is an IR object, give linker LTO plugin a chance to
3445 get the correct symbol table. */
3446 if (abfd
->plugin_format
== bfd_plugin_yes
3447 #if BFD_SUPPORTS_PLUGINS
3448 || (abfd
->plugin_format
== bfd_plugin_unknown
3449 && bfd_link_plugin_object_p (abfd
))
3453 /* Use the IR symbol table if the object has been claimed by
3455 abfd
= abfd
->plugin_dummy_bfd
;
3456 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3458 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3459 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3461 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3463 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3465 /* The sh_info field of the symtab header tells us where the
3466 external symbols start. We don't care about the local symbols. */
3467 if (elf_bad_symtab (abfd
))
3469 extsymcount
= symcount
;
3474 extsymcount
= symcount
- hdr
->sh_info
;
3475 extsymoff
= hdr
->sh_info
;
3478 if (extsymcount
== 0)
3481 /* Read in the symbol table. */
3482 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3484 if (isymbuf
== NULL
)
3487 /* Scan the symbol table looking for SYMDEF. */
3489 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3493 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3498 if (strcmp (name
, symdef
->name
) == 0)
3500 result
= is_global_data_symbol_definition (abfd
, isym
);
3510 /* Add an entry to the .dynamic table. */
3513 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3517 struct elf_link_hash_table
*hash_table
;
3518 const struct elf_backend_data
*bed
;
3520 bfd_size_type newsize
;
3521 bfd_byte
*newcontents
;
3522 Elf_Internal_Dyn dyn
;
3524 hash_table
= elf_hash_table (info
);
3525 if (! is_elf_hash_table (&hash_table
->root
))
3528 if (tag
== DT_RELA
|| tag
== DT_REL
)
3529 hash_table
->dynamic_relocs
= true;
3531 bed
= get_elf_backend_data (hash_table
->dynobj
);
3532 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3533 BFD_ASSERT (s
!= NULL
);
3535 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3536 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3537 if (newcontents
== NULL
)
3541 dyn
.d_un
.d_val
= val
;
3542 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3545 s
->contents
= newcontents
;
3550 /* Strip zero-sized dynamic sections. */
3553 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3555 struct elf_link_hash_table
*hash_table
;
3556 const struct elf_backend_data
*bed
;
3557 asection
*s
, *sdynamic
, **pp
;
3558 asection
*rela_dyn
, *rel_dyn
;
3559 Elf_Internal_Dyn dyn
;
3560 bfd_byte
*extdyn
, *next
;
3561 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3562 bool strip_zero_sized
;
3563 bool strip_zero_sized_plt
;
3565 if (bfd_link_relocatable (info
))
3568 hash_table
= elf_hash_table (info
);
3569 if (!is_elf_hash_table (&hash_table
->root
))
3572 if (!hash_table
->dynobj
)
3575 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3579 bed
= get_elf_backend_data (hash_table
->dynobj
);
3580 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3582 strip_zero_sized
= false;
3583 strip_zero_sized_plt
= false;
3585 /* Strip zero-sized dynamic sections. */
3586 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3587 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3588 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3592 || s
== hash_table
->srelplt
->output_section
3593 || s
== hash_table
->splt
->output_section
))
3596 info
->output_bfd
->section_count
--;
3597 strip_zero_sized
= true;
3602 else if (s
== hash_table
->splt
->output_section
)
3604 s
= hash_table
->splt
;
3605 strip_zero_sized_plt
= true;
3608 s
= hash_table
->srelplt
;
3609 s
->flags
|= SEC_EXCLUDE
;
3610 s
->output_section
= bfd_abs_section_ptr
;
3615 if (strip_zero_sized_plt
)
3616 for (extdyn
= sdynamic
->contents
;
3617 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3620 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3621 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3629 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3630 the procedure linkage table (the .plt section) has been
3632 memmove (extdyn
, next
,
3633 sdynamic
->size
- (next
- sdynamic
->contents
));
3638 if (strip_zero_sized
)
3640 /* Regenerate program headers. */
3641 elf_seg_map (info
->output_bfd
) = NULL
;
3642 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
);
3648 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3649 1 if a DT_NEEDED tag already exists, and 0 on success. */
3652 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3654 struct elf_link_hash_table
*hash_table
;
3658 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3661 hash_table
= elf_hash_table (info
);
3662 soname
= elf_dt_name (abfd
);
3663 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, false);
3664 if (strindex
== (size_t) -1)
3667 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3670 const struct elf_backend_data
*bed
;
3673 bed
= get_elf_backend_data (hash_table
->dynobj
);
3674 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3676 for (extdyn
= sdyn
->contents
;
3677 extdyn
< sdyn
->contents
+ sdyn
->size
;
3678 extdyn
+= bed
->s
->sizeof_dyn
)
3680 Elf_Internal_Dyn dyn
;
3682 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3683 if (dyn
.d_tag
== DT_NEEDED
3684 && dyn
.d_un
.d_val
== strindex
)
3686 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3692 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3695 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3701 /* Return true if SONAME is on the needed list between NEEDED and STOP
3702 (or the end of list if STOP is NULL), and needed by a library that
3706 on_needed_list (const char *soname
,
3707 struct bfd_link_needed_list
*needed
,
3708 struct bfd_link_needed_list
*stop
)
3710 struct bfd_link_needed_list
*look
;
3711 for (look
= needed
; look
!= stop
; look
= look
->next
)
3712 if (strcmp (soname
, look
->name
) == 0
3713 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3714 /* If needed by a library that itself is not directly
3715 needed, recursively check whether that library is
3716 indirectly needed. Since we add DT_NEEDED entries to
3717 the end of the list, library dependencies appear after
3718 the library. Therefore search prior to the current
3719 LOOK, preventing possible infinite recursion. */
3720 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3726 /* Sort symbol by value, section, size, and type. */
3728 elf_sort_symbol (const void *arg1
, const void *arg2
)
3730 const struct elf_link_hash_entry
*h1
;
3731 const struct elf_link_hash_entry
*h2
;
3732 bfd_signed_vma vdiff
;
3737 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3738 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3739 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3741 return vdiff
> 0 ? 1 : -1;
3743 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3747 /* Sort so that sized symbols are selected over zero size symbols. */
3748 vdiff
= h1
->size
- h2
->size
;
3750 return vdiff
> 0 ? 1 : -1;
3752 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3753 if (h1
->type
!= h2
->type
)
3754 return h1
->type
- h2
->type
;
3756 /* If symbols are properly sized and typed, and multiple strong
3757 aliases are not defined in a shared library by the user we
3758 shouldn't get here. Unfortunately linker script symbols like
3759 __bss_start sometimes match a user symbol defined at the start of
3760 .bss without proper size and type. We'd like to preference the
3761 user symbol over reserved system symbols. Sort on leading
3763 n1
= h1
->root
.root
.string
;
3764 n2
= h2
->root
.root
.string
;
3777 /* Final sort on name selects user symbols like '_u' over reserved
3778 system symbols like '_Z' and also will avoid qsort instability. */
3782 /* This function is used to adjust offsets into .dynstr for
3783 dynamic symbols. This is called via elf_link_hash_traverse. */
3786 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3788 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3790 if (h
->dynindx
!= -1)
3791 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3795 /* Assign string offsets in .dynstr, update all structures referencing
3799 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3801 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3802 struct elf_link_local_dynamic_entry
*entry
;
3803 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3804 bfd
*dynobj
= hash_table
->dynobj
;
3807 const struct elf_backend_data
*bed
;
3810 _bfd_elf_strtab_finalize (dynstr
);
3811 size
= _bfd_elf_strtab_size (dynstr
);
3813 /* Allow the linker to examine the dynsymtab now it's fully populated. */
3815 if (info
->callbacks
->examine_strtab
)
3816 info
->callbacks
->examine_strtab (dynstr
);
3818 bed
= get_elf_backend_data (dynobj
);
3819 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3820 BFD_ASSERT (sdyn
!= NULL
);
3822 /* Update all .dynamic entries referencing .dynstr strings. */
3823 for (extdyn
= sdyn
->contents
;
3824 extdyn
< sdyn
->contents
+ sdyn
->size
;
3825 extdyn
+= bed
->s
->sizeof_dyn
)
3827 Elf_Internal_Dyn dyn
;
3829 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3833 dyn
.d_un
.d_val
= size
;
3843 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3848 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3851 /* Now update local dynamic symbols. */
3852 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3853 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3854 entry
->isym
.st_name
);
3856 /* And the rest of dynamic symbols. */
3857 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3859 /* Adjust version definitions. */
3860 if (elf_tdata (output_bfd
)->cverdefs
)
3865 Elf_Internal_Verdef def
;
3866 Elf_Internal_Verdaux defaux
;
3868 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3872 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3874 p
+= sizeof (Elf_External_Verdef
);
3875 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3877 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3879 _bfd_elf_swap_verdaux_in (output_bfd
,
3880 (Elf_External_Verdaux
*) p
, &defaux
);
3881 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3883 _bfd_elf_swap_verdaux_out (output_bfd
,
3884 &defaux
, (Elf_External_Verdaux
*) p
);
3885 p
+= sizeof (Elf_External_Verdaux
);
3888 while (def
.vd_next
);
3891 /* Adjust version references. */
3892 if (elf_tdata (output_bfd
)->verref
)
3897 Elf_Internal_Verneed need
;
3898 Elf_Internal_Vernaux needaux
;
3900 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3904 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3906 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3907 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3908 (Elf_External_Verneed
*) p
);
3909 p
+= sizeof (Elf_External_Verneed
);
3910 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3912 _bfd_elf_swap_vernaux_in (output_bfd
,
3913 (Elf_External_Vernaux
*) p
, &needaux
);
3914 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3916 _bfd_elf_swap_vernaux_out (output_bfd
,
3918 (Elf_External_Vernaux
*) p
);
3919 p
+= sizeof (Elf_External_Vernaux
);
3922 while (need
.vn_next
);
3928 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3929 The default is to only match when the INPUT and OUTPUT are exactly
3933 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3934 const bfd_target
*output
)
3936 return input
== output
;
3939 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3940 This version is used when different targets for the same architecture
3941 are virtually identical. */
3944 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3945 const bfd_target
*output
)
3947 const struct elf_backend_data
*obed
, *ibed
;
3949 if (input
== output
)
3952 ibed
= xvec_get_elf_backend_data (input
);
3953 obed
= xvec_get_elf_backend_data (output
);
3955 if (ibed
->arch
!= obed
->arch
)
3958 /* If both backends are using this function, deem them compatible. */
3959 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3962 /* Make a special call to the linker "notice" function to tell it that
3963 we are about to handle an as-needed lib, or have finished
3964 processing the lib. */
3967 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3968 struct bfd_link_info
*info
,
3969 enum notice_asneeded_action act
)
3971 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3974 /* Check relocations an ELF object file. */
3977 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3979 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3980 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3982 /* If this object is the same format as the output object, and it is
3983 not a shared library, then let the backend look through the
3986 This is required to build global offset table entries and to
3987 arrange for dynamic relocs. It is not required for the
3988 particular common case of linking non PIC code, even when linking
3989 against shared libraries, but unfortunately there is no way of
3990 knowing whether an object file has been compiled PIC or not.
3991 Looking through the relocs is not particularly time consuming.
3992 The problem is that we must either (1) keep the relocs in memory,
3993 which causes the linker to require additional runtime memory or
3994 (2) read the relocs twice from the input file, which wastes time.
3995 This would be a good case for using mmap.
3997 I have no idea how to handle linking PIC code into a file of a
3998 different format. It probably can't be done. */
3999 if ((abfd
->flags
& DYNAMIC
) == 0
4000 && is_elf_hash_table (&htab
->root
)
4001 && bed
->check_relocs
!= NULL
4002 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4003 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4007 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4009 Elf_Internal_Rela
*internal_relocs
;
4012 /* Don't check relocations in excluded sections. Don't do
4013 anything special with non-loaded, non-alloced sections.
4014 In particular, any relocs in such sections should not
4015 affect GOT and PLT reference counting (ie. we don't
4016 allow them to create GOT or PLT entries), there's no
4017 possibility or desire to optimize TLS relocs, and
4018 there's not much point in propagating relocs to shared
4019 libs that the dynamic linker won't relocate. */
4020 if ((o
->flags
& SEC_ALLOC
) == 0
4021 || (o
->flags
& SEC_RELOC
) == 0
4022 || (o
->flags
& SEC_EXCLUDE
) != 0
4023 || o
->reloc_count
== 0
4024 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4025 && (o
->flags
& SEC_DEBUGGING
) != 0)
4026 || bfd_is_abs_section (o
->output_section
))
4029 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4031 if (internal_relocs
== NULL
)
4034 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4036 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4037 free (internal_relocs
);
4047 /* Add symbols from an ELF object file to the linker hash table. */
4050 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4052 Elf_Internal_Ehdr
*ehdr
;
4053 Elf_Internal_Shdr
*hdr
;
4057 struct elf_link_hash_entry
**sym_hash
;
4059 Elf_External_Versym
*extversym
= NULL
;
4060 Elf_External_Versym
*extversym_end
= NULL
;
4061 Elf_External_Versym
*ever
;
4062 struct elf_link_hash_entry
*weaks
;
4063 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4064 size_t nondeflt_vers_cnt
= 0;
4065 Elf_Internal_Sym
*isymbuf
= NULL
;
4066 Elf_Internal_Sym
*isym
;
4067 Elf_Internal_Sym
*isymend
;
4068 const struct elf_backend_data
*bed
;
4070 struct elf_link_hash_table
*htab
;
4071 void *alloc_mark
= NULL
;
4072 struct bfd_hash_entry
**old_table
= NULL
;
4073 unsigned int old_size
= 0;
4074 unsigned int old_count
= 0;
4075 void *old_tab
= NULL
;
4077 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4078 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4079 void *old_strtab
= NULL
;
4084 htab
= elf_hash_table (info
);
4085 bed
= get_elf_backend_data (abfd
);
4087 if ((abfd
->flags
& DYNAMIC
) == 0)
4093 /* You can't use -r against a dynamic object. Also, there's no
4094 hope of using a dynamic object which does not exactly match
4095 the format of the output file. */
4096 if (bfd_link_relocatable (info
)
4097 || !is_elf_hash_table (&htab
->root
)
4098 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4100 if (bfd_link_relocatable (info
))
4101 bfd_set_error (bfd_error_invalid_operation
);
4103 bfd_set_error (bfd_error_wrong_format
);
4108 ehdr
= elf_elfheader (abfd
);
4109 if (info
->warn_alternate_em
4110 && bed
->elf_machine_code
!= ehdr
->e_machine
4111 && ((bed
->elf_machine_alt1
!= 0
4112 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4113 || (bed
->elf_machine_alt2
!= 0
4114 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4116 /* xgettext:c-format */
4117 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4118 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4120 /* As a GNU extension, any input sections which are named
4121 .gnu.warning.SYMBOL are treated as warning symbols for the given
4122 symbol. This differs from .gnu.warning sections, which generate
4123 warnings when they are included in an output file. */
4124 /* PR 12761: Also generate this warning when building shared libraries. */
4125 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4129 name
= bfd_section_name (s
);
4130 if (startswith (name
, ".gnu.warning."))
4135 name
+= sizeof ".gnu.warning." - 1;
4137 /* If this is a shared object, then look up the symbol
4138 in the hash table. If it is there, and it is already
4139 been defined, then we will not be using the entry
4140 from this shared object, so we don't need to warn.
4141 FIXME: If we see the definition in a regular object
4142 later on, we will warn, but we shouldn't. The only
4143 fix is to keep track of what warnings we are supposed
4144 to emit, and then handle them all at the end of the
4148 struct elf_link_hash_entry
*h
;
4150 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
4152 /* FIXME: What about bfd_link_hash_common? */
4154 && (h
->root
.type
== bfd_link_hash_defined
4155 || h
->root
.type
== bfd_link_hash_defweak
))
4160 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4164 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4169 if (! (_bfd_generic_link_add_one_symbol
4170 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4171 false, bed
->collect
, NULL
)))
4174 if (bfd_link_executable (info
))
4176 /* Clobber the section size so that the warning does
4177 not get copied into the output file. */
4180 /* Also set SEC_EXCLUDE, so that symbols defined in
4181 the warning section don't get copied to the output. */
4182 s
->flags
|= SEC_EXCLUDE
;
4187 just_syms
= ((s
= abfd
->sections
) != NULL
4188 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4193 /* If we are creating a shared library, create all the dynamic
4194 sections immediately. We need to attach them to something,
4195 so we attach them to this BFD, provided it is the right
4196 format and is not from ld --just-symbols. Always create the
4197 dynamic sections for -E/--dynamic-list. FIXME: If there
4198 are no input BFD's of the same format as the output, we can't
4199 make a shared library. */
4201 && (bfd_link_pic (info
)
4202 || (!bfd_link_relocatable (info
)
4204 && (info
->export_dynamic
|| info
->dynamic
)))
4205 && is_elf_hash_table (&htab
->root
)
4206 && info
->output_bfd
->xvec
== abfd
->xvec
4207 && !htab
->dynamic_sections_created
)
4209 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4213 else if (!is_elf_hash_table (&htab
->root
))
4217 const char *soname
= NULL
;
4219 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4220 const Elf_Internal_Phdr
*phdr
;
4221 struct elf_link_loaded_list
*loaded_lib
;
4223 /* ld --just-symbols and dynamic objects don't mix very well.
4224 ld shouldn't allow it. */
4228 /* If this dynamic lib was specified on the command line with
4229 --as-needed in effect, then we don't want to add a DT_NEEDED
4230 tag unless the lib is actually used. Similary for libs brought
4231 in by another lib's DT_NEEDED. When --no-add-needed is used
4232 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4233 any dynamic library in DT_NEEDED tags in the dynamic lib at
4235 add_needed
= (elf_dyn_lib_class (abfd
)
4236 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4237 | DYN_NO_NEEDED
)) == 0;
4239 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4244 unsigned int elfsec
;
4245 unsigned long shlink
;
4247 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4254 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4255 if (elfsec
== SHN_BAD
)
4256 goto error_free_dyn
;
4257 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4259 for (extdyn
= dynbuf
;
4260 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4261 extdyn
+= bed
->s
->sizeof_dyn
)
4263 Elf_Internal_Dyn dyn
;
4265 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4266 if (dyn
.d_tag
== DT_SONAME
)
4268 unsigned int tagv
= dyn
.d_un
.d_val
;
4269 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4271 goto error_free_dyn
;
4273 if (dyn
.d_tag
== DT_NEEDED
)
4275 struct bfd_link_needed_list
*n
, **pn
;
4277 unsigned int tagv
= dyn
.d_un
.d_val
;
4278 size_t amt
= sizeof (struct bfd_link_needed_list
);
4280 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4281 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4282 if (n
== NULL
|| fnm
== NULL
)
4283 goto error_free_dyn
;
4284 amt
= strlen (fnm
) + 1;
4285 anm
= (char *) bfd_alloc (abfd
, amt
);
4287 goto error_free_dyn
;
4288 memcpy (anm
, fnm
, amt
);
4292 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4296 if (dyn
.d_tag
== DT_RUNPATH
)
4298 struct bfd_link_needed_list
*n
, **pn
;
4300 unsigned int tagv
= dyn
.d_un
.d_val
;
4301 size_t amt
= sizeof (struct bfd_link_needed_list
);
4303 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4304 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4305 if (n
== NULL
|| fnm
== NULL
)
4306 goto error_free_dyn
;
4307 amt
= strlen (fnm
) + 1;
4308 anm
= (char *) bfd_alloc (abfd
, amt
);
4310 goto error_free_dyn
;
4311 memcpy (anm
, fnm
, amt
);
4315 for (pn
= & runpath
;
4321 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4322 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4324 struct bfd_link_needed_list
*n
, **pn
;
4326 unsigned int tagv
= dyn
.d_un
.d_val
;
4327 size_t amt
= sizeof (struct bfd_link_needed_list
);
4329 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4330 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4331 if (n
== NULL
|| fnm
== NULL
)
4332 goto error_free_dyn
;
4333 amt
= strlen (fnm
) + 1;
4334 anm
= (char *) bfd_alloc (abfd
, amt
);
4336 goto error_free_dyn
;
4337 memcpy (anm
, fnm
, amt
);
4347 if (dyn
.d_tag
== DT_AUDIT
)
4349 unsigned int tagv
= dyn
.d_un
.d_val
;
4350 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4352 if (dyn
.d_tag
== DT_FLAGS_1
)
4353 elf_tdata (abfd
)->is_pie
= (dyn
.d_un
.d_val
& DF_1_PIE
) != 0;
4359 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4360 frees all more recently bfd_alloc'd blocks as well. */
4366 struct bfd_link_needed_list
**pn
;
4367 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4372 /* If we have a PT_GNU_RELRO program header, mark as read-only
4373 all sections contained fully therein. This makes relro
4374 shared library sections appear as they will at run-time. */
4375 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4376 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4377 if (phdr
->p_type
== PT_GNU_RELRO
)
4379 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4381 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4383 if ((s
->flags
& SEC_ALLOC
) != 0
4384 && s
->vma
* opb
>= phdr
->p_vaddr
4385 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4386 s
->flags
|= SEC_READONLY
;
4391 /* We do not want to include any of the sections in a dynamic
4392 object in the output file. We hack by simply clobbering the
4393 list of sections in the BFD. This could be handled more
4394 cleanly by, say, a new section flag; the existing
4395 SEC_NEVER_LOAD flag is not the one we want, because that one
4396 still implies that the section takes up space in the output
4398 bfd_section_list_clear (abfd
);
4400 /* Find the name to use in a DT_NEEDED entry that refers to this
4401 object. If the object has a DT_SONAME entry, we use it.
4402 Otherwise, if the generic linker stuck something in
4403 elf_dt_name, we use that. Otherwise, we just use the file
4405 if (soname
== NULL
|| *soname
== '\0')
4407 soname
= elf_dt_name (abfd
);
4408 if (soname
== NULL
|| *soname
== '\0')
4409 soname
= bfd_get_filename (abfd
);
4412 /* Save the SONAME because sometimes the linker emulation code
4413 will need to know it. */
4414 elf_dt_name (abfd
) = soname
;
4416 /* If we have already included this dynamic object in the
4417 link, just ignore it. There is no reason to include a
4418 particular dynamic object more than once. */
4419 for (loaded_lib
= htab
->dyn_loaded
;
4421 loaded_lib
= loaded_lib
->next
)
4423 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4427 /* Create dynamic sections for backends that require that be done
4428 before setup_gnu_properties. */
4430 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4433 /* Save the DT_AUDIT entry for the linker emulation code. */
4434 elf_dt_audit (abfd
) = audit
;
4437 /* If this is a dynamic object, we always link against the .dynsym
4438 symbol table, not the .symtab symbol table. The dynamic linker
4439 will only see the .dynsym symbol table, so there is no reason to
4440 look at .symtab for a dynamic object. */
4442 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4443 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4445 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4447 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4449 /* The sh_info field of the symtab header tells us where the
4450 external symbols start. We don't care about the local symbols at
4452 if (elf_bad_symtab (abfd
))
4454 extsymcount
= symcount
;
4459 extsymcount
= symcount
- hdr
->sh_info
;
4460 extsymoff
= hdr
->sh_info
;
4463 sym_hash
= elf_sym_hashes (abfd
);
4464 if (extsymcount
!= 0)
4466 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4468 if (isymbuf
== NULL
)
4471 if (sym_hash
== NULL
)
4473 /* We store a pointer to the hash table entry for each
4475 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4476 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4477 if (sym_hash
== NULL
)
4478 goto error_free_sym
;
4479 elf_sym_hashes (abfd
) = sym_hash
;
4485 /* Read in any version definitions. */
4486 if (!_bfd_elf_slurp_version_tables (abfd
,
4487 info
->default_imported_symver
))
4488 goto error_free_sym
;
4490 /* Read in the symbol versions, but don't bother to convert them
4491 to internal format. */
4492 if (elf_dynversym (abfd
) != 0)
4494 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4495 bfd_size_type amt
= versymhdr
->sh_size
;
4497 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4498 goto error_free_sym
;
4499 extversym
= (Elf_External_Versym
*)
4500 _bfd_malloc_and_read (abfd
, amt
, amt
);
4501 if (extversym
== NULL
)
4502 goto error_free_sym
;
4503 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4507 /* If we are loading an as-needed shared lib, save the symbol table
4508 state before we start adding symbols. If the lib turns out
4509 to be unneeded, restore the state. */
4510 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4515 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4517 struct bfd_hash_entry
*p
;
4518 struct elf_link_hash_entry
*h
;
4520 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4522 h
= (struct elf_link_hash_entry
*) p
;
4523 entsize
+= htab
->root
.table
.entsize
;
4524 if (h
->root
.type
== bfd_link_hash_warning
)
4526 entsize
+= htab
->root
.table
.entsize
;
4527 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4529 if (h
->root
.type
== bfd_link_hash_common
)
4530 entsize
+= sizeof (*h
->root
.u
.c
.p
);
4534 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4535 old_tab
= bfd_malloc (tabsize
+ entsize
);
4536 if (old_tab
== NULL
)
4537 goto error_free_vers
;
4539 /* Remember the current objalloc pointer, so that all mem for
4540 symbols added can later be reclaimed. */
4541 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4542 if (alloc_mark
== NULL
)
4543 goto error_free_vers
;
4545 /* Make a special call to the linker "notice" function to
4546 tell it that we are about to handle an as-needed lib. */
4547 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4548 goto error_free_vers
;
4550 /* Clone the symbol table. Remember some pointers into the
4551 symbol table, and dynamic symbol count. */
4552 old_ent
= (char *) old_tab
+ tabsize
;
4553 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4554 old_undefs
= htab
->root
.undefs
;
4555 old_undefs_tail
= htab
->root
.undefs_tail
;
4556 old_table
= htab
->root
.table
.table
;
4557 old_size
= htab
->root
.table
.size
;
4558 old_count
= htab
->root
.table
.count
;
4560 if (htab
->dynstr
!= NULL
)
4562 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4563 if (old_strtab
== NULL
)
4564 goto error_free_vers
;
4567 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4569 struct bfd_hash_entry
*p
;
4570 struct elf_link_hash_entry
*h
;
4572 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4574 h
= (struct elf_link_hash_entry
*) p
;
4575 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4576 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4577 if (h
->root
.type
== bfd_link_hash_warning
)
4579 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4580 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4581 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4583 if (h
->root
.type
== bfd_link_hash_common
)
4585 memcpy (old_ent
, h
->root
.u
.c
.p
, sizeof (*h
->root
.u
.c
.p
));
4586 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
4593 if (extversym
== NULL
)
4595 else if (extversym
+ extsymoff
< extversym_end
)
4596 ever
= extversym
+ extsymoff
;
4599 /* xgettext:c-format */
4600 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4601 abfd
, (long) extsymoff
,
4602 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4603 bfd_set_error (bfd_error_bad_value
);
4604 goto error_free_vers
;
4607 if (!bfd_link_relocatable (info
)
4608 && abfd
->lto_slim_object
)
4611 (_("%pB: plugin needed to handle lto object"), abfd
);
4614 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4616 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4620 asection
*sec
, *new_sec
;
4623 struct elf_link_hash_entry
*h
;
4624 struct elf_link_hash_entry
*hi
;
4626 bool size_change_ok
;
4627 bool type_change_ok
;
4633 unsigned int old_alignment
;
4634 unsigned int shindex
;
4640 flags
= BSF_NO_FLAGS
;
4642 value
= isym
->st_value
;
4643 common
= bed
->common_definition (isym
);
4644 if (common
&& info
->inhibit_common_definition
)
4646 /* Treat common symbol as undefined for --no-define-common. */
4647 isym
->st_shndx
= SHN_UNDEF
;
4652 bind
= ELF_ST_BIND (isym
->st_info
);
4656 /* This should be impossible, since ELF requires that all
4657 global symbols follow all local symbols, and that sh_info
4658 point to the first global symbol. Unfortunately, Irix 5
4660 if (elf_bad_symtab (abfd
))
4663 /* If we aren't prepared to handle locals within the globals
4664 then we'll likely segfault on a NULL symbol hash if the
4665 symbol is ever referenced in relocations. */
4666 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4667 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4668 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4669 " (>= sh_info of %lu)"),
4670 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4673 /* Dynamic object relocations are not processed by ld, so
4674 ld won't run into the problem mentioned above. */
4677 bfd_set_error (bfd_error_bad_value
);
4678 goto error_free_vers
;
4681 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4689 case STB_GNU_UNIQUE
:
4690 flags
= BSF_GNU_UNIQUE
;
4694 /* Leave it up to the processor backend. */
4698 if (isym
->st_shndx
== SHN_UNDEF
)
4699 sec
= bfd_und_section_ptr
;
4700 else if (isym
->st_shndx
== SHN_ABS
)
4701 sec
= bfd_abs_section_ptr
;
4702 else if (isym
->st_shndx
== SHN_COMMON
)
4704 sec
= bfd_com_section_ptr
;
4705 /* What ELF calls the size we call the value. What ELF
4706 calls the value we call the alignment. */
4707 value
= isym
->st_size
;
4711 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4713 sec
= bfd_abs_section_ptr
;
4714 else if (discarded_section (sec
))
4716 /* Symbols from discarded section are undefined. We keep
4718 sec
= bfd_und_section_ptr
;
4720 isym
->st_shndx
= SHN_UNDEF
;
4722 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4726 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4729 goto error_free_vers
;
4731 if (isym
->st_shndx
== SHN_COMMON
4732 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4734 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4738 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4740 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4742 goto error_free_vers
;
4746 else if (isym
->st_shndx
== SHN_COMMON
4747 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4748 && !bfd_link_relocatable (info
))
4750 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4754 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4755 | SEC_LINKER_CREATED
);
4756 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4758 goto error_free_vers
;
4762 else if (bed
->elf_add_symbol_hook
)
4764 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4766 goto error_free_vers
;
4768 /* The hook function sets the name to NULL if this symbol
4769 should be skipped for some reason. */
4774 /* Sanity check that all possibilities were handled. */
4778 /* Silently discard TLS symbols from --just-syms. There's
4779 no way to combine a static TLS block with a new TLS block
4780 for this executable. */
4781 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4782 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4785 if (bfd_is_und_section (sec
)
4786 || bfd_is_com_section (sec
))
4791 size_change_ok
= false;
4792 type_change_ok
= bed
->type_change_ok
;
4799 if (is_elf_hash_table (&htab
->root
))
4801 Elf_Internal_Versym iver
;
4802 unsigned int vernum
= 0;
4807 if (info
->default_imported_symver
)
4808 /* Use the default symbol version created earlier. */
4809 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4813 else if (ever
>= extversym_end
)
4815 /* xgettext:c-format */
4816 _bfd_error_handler (_("%pB: not enough version information"),
4818 bfd_set_error (bfd_error_bad_value
);
4819 goto error_free_vers
;
4822 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4824 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4826 /* If this is a hidden symbol, or if it is not version
4827 1, we append the version name to the symbol name.
4828 However, we do not modify a non-hidden absolute symbol
4829 if it is not a function, because it might be the version
4830 symbol itself. FIXME: What if it isn't? */
4831 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4833 && (!bfd_is_abs_section (sec
)
4834 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4837 size_t namelen
, verlen
, newlen
;
4840 if (isym
->st_shndx
!= SHN_UNDEF
)
4842 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4844 else if (vernum
> 1)
4846 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4853 /* xgettext:c-format */
4854 (_("%pB: %s: invalid version %u (max %d)"),
4856 elf_tdata (abfd
)->cverdefs
);
4857 bfd_set_error (bfd_error_bad_value
);
4858 goto error_free_vers
;
4863 /* We cannot simply test for the number of
4864 entries in the VERNEED section since the
4865 numbers for the needed versions do not start
4867 Elf_Internal_Verneed
*t
;
4870 for (t
= elf_tdata (abfd
)->verref
;
4874 Elf_Internal_Vernaux
*a
;
4876 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4878 if (a
->vna_other
== vernum
)
4880 verstr
= a
->vna_nodename
;
4890 /* xgettext:c-format */
4891 (_("%pB: %s: invalid needed version %d"),
4892 abfd
, name
, vernum
);
4893 bfd_set_error (bfd_error_bad_value
);
4894 goto error_free_vers
;
4898 namelen
= strlen (name
);
4899 verlen
= strlen (verstr
);
4900 newlen
= namelen
+ verlen
+ 2;
4901 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4902 && isym
->st_shndx
!= SHN_UNDEF
)
4905 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4906 if (newname
== NULL
)
4907 goto error_free_vers
;
4908 memcpy (newname
, name
, namelen
);
4909 p
= newname
+ namelen
;
4911 /* If this is a defined non-hidden version symbol,
4912 we add another @ to the name. This indicates the
4913 default version of the symbol. */
4914 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4915 && isym
->st_shndx
!= SHN_UNDEF
)
4917 memcpy (p
, verstr
, verlen
+ 1);
4922 /* If this symbol has default visibility and the user has
4923 requested we not re-export it, then mark it as hidden. */
4924 if (!bfd_is_und_section (sec
)
4927 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4928 isym
->st_other
= (STV_HIDDEN
4929 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4931 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4932 sym_hash
, &old_bfd
, &old_weak
,
4933 &old_alignment
, &skip
, &override
,
4934 &type_change_ok
, &size_change_ok
,
4936 goto error_free_vers
;
4941 /* Override a definition only if the new symbol matches the
4943 if (override
&& matched
)
4947 while (h
->root
.type
== bfd_link_hash_indirect
4948 || h
->root
.type
== bfd_link_hash_warning
)
4949 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4951 if (elf_tdata (abfd
)->verdef
!= NULL
4954 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4957 if (! (_bfd_generic_link_add_one_symbol
4958 (info
, override
? override
: abfd
, name
, flags
, sec
, value
,
4959 NULL
, false, bed
->collect
,
4960 (struct bfd_link_hash_entry
**) sym_hash
)))
4961 goto error_free_vers
;
4964 /* We need to make sure that indirect symbol dynamic flags are
4967 while (h
->root
.type
== bfd_link_hash_indirect
4968 || h
->root
.type
== bfd_link_hash_warning
)
4969 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4973 /* Setting the index to -3 tells elf_link_output_extsym that
4974 this symbol is defined in a discarded section. */
4975 if (discarded
&& is_elf_hash_table (&htab
->root
))
4978 new_weak
= (flags
& BSF_WEAK
) != 0;
4982 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4983 && is_elf_hash_table (&htab
->root
)
4984 && h
->u
.alias
== NULL
)
4986 /* Keep a list of all weak defined non function symbols from
4987 a dynamic object, using the alias field. Later in this
4988 function we will set the alias field to the correct
4989 value. We only put non-function symbols from dynamic
4990 objects on this list, because that happens to be the only
4991 time we need to know the normal symbol corresponding to a
4992 weak symbol, and the information is time consuming to
4993 figure out. If the alias field is not already NULL,
4994 then this symbol was already defined by some previous
4995 dynamic object, and we will be using that previous
4996 definition anyhow. */
5002 /* Set the alignment of a common symbol. */
5003 if ((common
|| bfd_is_com_section (sec
))
5004 && h
->root
.type
== bfd_link_hash_common
)
5009 align
= bfd_log2 (isym
->st_value
);
5012 /* The new symbol is a common symbol in a shared object.
5013 We need to get the alignment from the section. */
5014 align
= new_sec
->alignment_power
;
5016 if (align
> old_alignment
)
5017 h
->root
.u
.c
.p
->alignment_power
= align
;
5019 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
5022 if (is_elf_hash_table (&htab
->root
))
5024 /* Set a flag in the hash table entry indicating the type of
5025 reference or definition we just found. A dynamic symbol
5026 is one which is referenced or defined by both a regular
5027 object and a shared object. */
5028 bool dynsym
= false;
5030 /* Plugin symbols aren't normal. Don't set def/ref flags. */
5031 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5033 /* Except for this flag to track nonweak references. */
5035 && bind
!= STB_WEAK
)
5036 h
->ref_ir_nonweak
= 1;
5043 if (bind
!= STB_WEAK
)
5044 h
->ref_regular_nonweak
= 1;
5061 hi
->ref_dynamic
= 1;
5066 hi
->def_dynamic
= 1;
5070 /* If an indirect symbol has been forced local, don't
5071 make the real symbol dynamic. */
5072 if (h
!= hi
&& hi
->forced_local
)
5076 if (bfd_link_dll (info
)
5086 && weakdef (h
)->dynindx
!= -1))
5090 /* Check to see if we need to add an indirect symbol for
5091 the default name. */
5093 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5095 && hi
->versioned
== versioned_hidden
))
5096 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5097 sec
, value
, &old_bfd
, &dynsym
))
5098 goto error_free_vers
;
5100 /* Check the alignment when a common symbol is involved. This
5101 can change when a common symbol is overridden by a normal
5102 definition or a common symbol is ignored due to the old
5103 normal definition. We need to make sure the maximum
5104 alignment is maintained. */
5105 if ((old_alignment
|| common
)
5106 && h
->root
.type
!= bfd_link_hash_common
)
5108 unsigned int common_align
;
5109 unsigned int normal_align
;
5110 unsigned int symbol_align
;
5114 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5115 || h
->root
.type
== bfd_link_hash_defweak
);
5117 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5118 if (h
->root
.u
.def
.section
->owner
!= NULL
5119 && (h
->root
.u
.def
.section
->owner
->flags
5120 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5122 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5123 if (normal_align
> symbol_align
)
5124 normal_align
= symbol_align
;
5127 normal_align
= symbol_align
;
5131 common_align
= old_alignment
;
5132 common_bfd
= old_bfd
;
5137 common_align
= bfd_log2 (isym
->st_value
);
5139 normal_bfd
= old_bfd
;
5142 if (normal_align
< common_align
)
5144 /* PR binutils/2735 */
5145 if (normal_bfd
== NULL
)
5147 /* xgettext:c-format */
5148 (_("warning: alignment %u of common symbol `%s' in %pB is"
5149 " greater than the alignment (%u) of its section %pA"),
5150 1 << common_align
, name
, common_bfd
,
5151 1 << normal_align
, h
->root
.u
.def
.section
);
5154 /* xgettext:c-format */
5155 (_("warning: alignment %u of symbol `%s' in %pB"
5156 " is smaller than %u in %pB"),
5157 1 << normal_align
, name
, normal_bfd
,
5158 1 << common_align
, common_bfd
);
5162 /* Remember the symbol size if it isn't undefined. */
5163 if (isym
->st_size
!= 0
5164 && isym
->st_shndx
!= SHN_UNDEF
5165 && (definition
|| h
->size
== 0))
5168 && h
->size
!= isym
->st_size
5169 && ! size_change_ok
)
5171 /* xgettext:c-format */
5172 (_("warning: size of symbol `%s' changed"
5173 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5174 name
, (uint64_t) h
->size
, old_bfd
,
5175 (uint64_t) isym
->st_size
, abfd
);
5177 h
->size
= isym
->st_size
;
5180 /* If this is a common symbol, then we always want H->SIZE
5181 to be the size of the common symbol. The code just above
5182 won't fix the size if a common symbol becomes larger. We
5183 don't warn about a size change here, because that is
5184 covered by --warn-common. Allow changes between different
5186 if (h
->root
.type
== bfd_link_hash_common
)
5187 h
->size
= h
->root
.u
.c
.size
;
5189 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5190 && ((definition
&& !new_weak
)
5191 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5192 || h
->type
== STT_NOTYPE
))
5194 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5196 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5198 if (type
== STT_GNU_IFUNC
5199 && (abfd
->flags
& DYNAMIC
) != 0)
5202 if (h
->type
!= type
)
5204 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5205 /* xgettext:c-format */
5207 (_("warning: type of symbol `%s' changed"
5208 " from %d to %d in %pB"),
5209 name
, h
->type
, type
, abfd
);
5215 /* Merge st_other field. */
5216 elf_merge_st_other (abfd
, h
, isym
->st_other
, sec
,
5217 definition
, dynamic
);
5219 /* We don't want to make debug symbol dynamic. */
5221 && (sec
->flags
& SEC_DEBUGGING
)
5222 && !bfd_link_relocatable (info
))
5225 /* Nor should we make plugin symbols dynamic. */
5226 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5231 h
->target_internal
= isym
->st_target_internal
;
5232 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5235 if (definition
&& !dynamic
)
5237 char *p
= strchr (name
, ELF_VER_CHR
);
5238 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5240 /* Queue non-default versions so that .symver x, x@FOO
5241 aliases can be checked. */
5244 size_t amt
= ((isymend
- isym
+ 1)
5245 * sizeof (struct elf_link_hash_entry
*));
5247 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5249 goto error_free_vers
;
5251 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5255 if (dynsym
&& h
->dynindx
== -1)
5257 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5258 goto error_free_vers
;
5260 && weakdef (h
)->dynindx
== -1)
5262 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5263 goto error_free_vers
;
5266 else if (h
->dynindx
!= -1)
5267 /* If the symbol already has a dynamic index, but
5268 visibility says it should not be visible, turn it into
5270 switch (ELF_ST_VISIBILITY (h
->other
))
5274 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
5282 && h
->root
.type
!= bfd_link_hash_indirect
5284 && h
->ref_regular_nonweak
)
5286 && (old_bfd
->flags
& BFD_PLUGIN
) != 0
5287 && h
->ref_ir_nonweak
5288 && !info
->lto_all_symbols_read
)
5289 || (h
->ref_dynamic_nonweak
5290 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5291 && !on_needed_list (elf_dt_name (abfd
),
5292 htab
->needed
, NULL
))))
5294 const char *soname
= elf_dt_name (abfd
);
5296 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5297 h
->root
.root
.string
);
5299 /* A symbol from a library loaded via DT_NEEDED of some
5300 other library is referenced by a regular object.
5301 Add a DT_NEEDED entry for it. Issue an error if
5302 --no-add-needed is used and the reference was not
5305 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5308 /* xgettext:c-format */
5309 (_("%pB: undefined reference to symbol '%s'"),
5311 bfd_set_error (bfd_error_missing_dso
);
5312 goto error_free_vers
;
5315 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5316 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5318 /* Create dynamic sections for backends that require
5319 that be done before setup_gnu_properties. */
5320 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5327 if (info
->lto_plugin_active
5328 && !bfd_link_relocatable (info
)
5329 && (abfd
->flags
& BFD_PLUGIN
) == 0
5335 if (bed
->s
->arch_size
== 32)
5340 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5341 referenced in regular objects so that linker plugin will get
5342 the correct symbol resolution. */
5344 sym_hash
= elf_sym_hashes (abfd
);
5345 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5347 Elf_Internal_Rela
*internal_relocs
;
5348 Elf_Internal_Rela
*rel
, *relend
;
5350 /* Don't check relocations in excluded sections. */
5351 if ((s
->flags
& SEC_RELOC
) == 0
5352 || s
->reloc_count
== 0
5353 || (s
->flags
& SEC_EXCLUDE
) != 0
5354 || ((info
->strip
== strip_all
5355 || info
->strip
== strip_debugger
)
5356 && (s
->flags
& SEC_DEBUGGING
) != 0))
5359 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5362 if (internal_relocs
== NULL
)
5363 goto error_free_vers
;
5365 rel
= internal_relocs
;
5366 relend
= rel
+ s
->reloc_count
;
5367 for ( ; rel
< relend
; rel
++)
5369 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5370 struct elf_link_hash_entry
*h
;
5372 /* Skip local symbols. */
5373 if (r_symndx
< extsymoff
)
5376 h
= sym_hash
[r_symndx
- extsymoff
];
5378 h
->root
.non_ir_ref_regular
= 1;
5381 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5382 free (internal_relocs
);
5391 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5395 /* Restore the symbol table. */
5396 old_ent
= (char *) old_tab
+ tabsize
;
5397 memset (elf_sym_hashes (abfd
), 0,
5398 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5399 htab
->root
.table
.table
= old_table
;
5400 htab
->root
.table
.size
= old_size
;
5401 htab
->root
.table
.count
= old_count
;
5402 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5403 htab
->root
.undefs
= old_undefs
;
5404 htab
->root
.undefs_tail
= old_undefs_tail
;
5405 if (htab
->dynstr
!= NULL
)
5406 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5409 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5411 struct bfd_hash_entry
*p
;
5412 struct elf_link_hash_entry
*h
;
5413 unsigned int non_ir_ref_dynamic
;
5415 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5417 /* Preserve non_ir_ref_dynamic so that this symbol
5418 will be exported when the dynamic lib becomes needed
5419 in the second pass. */
5420 h
= (struct elf_link_hash_entry
*) p
;
5421 if (h
->root
.type
== bfd_link_hash_warning
)
5422 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5423 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5425 h
= (struct elf_link_hash_entry
*) p
;
5426 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5427 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5428 if (h
->root
.type
== bfd_link_hash_warning
)
5430 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5431 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5432 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5434 if (h
->root
.type
== bfd_link_hash_common
)
5436 memcpy (h
->root
.u
.c
.p
, old_ent
, sizeof (*h
->root
.u
.c
.p
));
5437 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
5439 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5443 /* Make a special call to the linker "notice" function to
5444 tell it that symbols added for crefs may need to be removed. */
5445 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5446 goto error_free_vers
;
5449 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5451 free (nondeflt_vers
);
5455 if (old_tab
!= NULL
)
5457 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5458 goto error_free_vers
;
5463 /* Now that all the symbols from this input file are created, if
5464 not performing a relocatable link, handle .symver foo, foo@BAR
5465 such that any relocs against foo become foo@BAR. */
5466 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5470 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5472 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5473 char *shortname
, *p
;
5476 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5478 || (h
->root
.type
!= bfd_link_hash_defined
5479 && h
->root
.type
!= bfd_link_hash_defweak
))
5482 amt
= p
- h
->root
.root
.string
;
5483 shortname
= (char *) bfd_malloc (amt
+ 1);
5485 goto error_free_vers
;
5486 memcpy (shortname
, h
->root
.root
.string
, amt
);
5487 shortname
[amt
] = '\0';
5489 hi
= (struct elf_link_hash_entry
*)
5490 bfd_link_hash_lookup (&htab
->root
, shortname
,
5491 false, false, false);
5493 && hi
->root
.type
== h
->root
.type
5494 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5495 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5497 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
5498 hi
->root
.type
= bfd_link_hash_indirect
;
5499 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5500 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5501 sym_hash
= elf_sym_hashes (abfd
);
5503 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5504 if (sym_hash
[symidx
] == hi
)
5506 sym_hash
[symidx
] = h
;
5512 free (nondeflt_vers
);
5513 nondeflt_vers
= NULL
;
5516 /* Now set the alias field correctly for all the weak defined
5517 symbols we found. The only way to do this is to search all the
5518 symbols. Since we only need the information for non functions in
5519 dynamic objects, that's the only time we actually put anything on
5520 the list WEAKS. We need this information so that if a regular
5521 object refers to a symbol defined weakly in a dynamic object, the
5522 real symbol in the dynamic object is also put in the dynamic
5523 symbols; we also must arrange for both symbols to point to the
5524 same memory location. We could handle the general case of symbol
5525 aliasing, but a general symbol alias can only be generated in
5526 assembler code, handling it correctly would be very time
5527 consuming, and other ELF linkers don't handle general aliasing
5531 struct elf_link_hash_entry
**hpp
;
5532 struct elf_link_hash_entry
**hppend
;
5533 struct elf_link_hash_entry
**sorted_sym_hash
;
5534 struct elf_link_hash_entry
*h
;
5535 size_t sym_count
, amt
;
5537 /* Since we have to search the whole symbol list for each weak
5538 defined symbol, search time for N weak defined symbols will be
5539 O(N^2). Binary search will cut it down to O(NlogN). */
5540 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5541 sorted_sym_hash
= bfd_malloc (amt
);
5542 if (sorted_sym_hash
== NULL
)
5544 sym_hash
= sorted_sym_hash
;
5545 hpp
= elf_sym_hashes (abfd
);
5546 hppend
= hpp
+ extsymcount
;
5548 for (; hpp
< hppend
; hpp
++)
5552 && h
->root
.type
== bfd_link_hash_defined
5553 && !bed
->is_function_type (h
->type
))
5561 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5564 while (weaks
!= NULL
)
5566 struct elf_link_hash_entry
*hlook
;
5569 size_t i
, j
, idx
= 0;
5572 weaks
= hlook
->u
.alias
;
5573 hlook
->u
.alias
= NULL
;
5575 if (hlook
->root
.type
!= bfd_link_hash_defined
5576 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5579 slook
= hlook
->root
.u
.def
.section
;
5580 vlook
= hlook
->root
.u
.def
.value
;
5586 bfd_signed_vma vdiff
;
5588 h
= sorted_sym_hash
[idx
];
5589 vdiff
= vlook
- h
->root
.u
.def
.value
;
5596 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5606 /* We didn't find a value/section match. */
5610 /* With multiple aliases, or when the weak symbol is already
5611 strongly defined, we have multiple matching symbols and
5612 the binary search above may land on any of them. Step
5613 one past the matching symbol(s). */
5616 h
= sorted_sym_hash
[idx
];
5617 if (h
->root
.u
.def
.section
!= slook
5618 || h
->root
.u
.def
.value
!= vlook
)
5622 /* Now look back over the aliases. Since we sorted by size
5623 as well as value and section, we'll choose the one with
5624 the largest size. */
5627 h
= sorted_sym_hash
[idx
];
5629 /* Stop if value or section doesn't match. */
5630 if (h
->root
.u
.def
.section
!= slook
5631 || h
->root
.u
.def
.value
!= vlook
)
5633 else if (h
!= hlook
)
5635 struct elf_link_hash_entry
*t
;
5638 hlook
->is_weakalias
= 1;
5640 if (t
->u
.alias
!= NULL
)
5641 while (t
->u
.alias
!= h
)
5645 /* If the weak definition is in the list of dynamic
5646 symbols, make sure the real definition is put
5648 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5650 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5653 free (sorted_sym_hash
);
5658 /* If the real definition is in the list of dynamic
5659 symbols, make sure the weak definition is put
5660 there as well. If we don't do this, then the
5661 dynamic loader might not merge the entries for the
5662 real definition and the weak definition. */
5663 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5665 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5666 goto err_free_sym_hash
;
5673 free (sorted_sym_hash
);
5676 if (bed
->check_directives
5677 && !(*bed
->check_directives
) (abfd
, info
))
5680 /* If this is a non-traditional link, try to optimize the handling
5681 of the .stab/.stabstr sections. */
5683 && ! info
->traditional_format
5684 && is_elf_hash_table (&htab
->root
)
5685 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5689 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5690 if (stabstr
!= NULL
)
5692 bfd_size_type string_offset
= 0;
5695 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5696 if (startswith (stab
->name
, ".stab")
5697 && (!stab
->name
[5] ||
5698 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5699 && (stab
->flags
& SEC_MERGE
) == 0
5700 && !bfd_is_abs_section (stab
->output_section
))
5702 struct bfd_elf_section_data
*secdata
;
5704 secdata
= elf_section_data (stab
);
5705 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5706 stabstr
, &secdata
->sec_info
,
5709 if (secdata
->sec_info
)
5710 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5715 if (dynamic
&& add_needed
)
5717 /* Add this bfd to the loaded list. */
5718 struct elf_link_loaded_list
*n
;
5720 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5724 n
->next
= htab
->dyn_loaded
;
5725 htab
->dyn_loaded
= n
;
5727 if (dynamic
&& !add_needed
5728 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5729 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5736 free (nondeflt_vers
);
5744 /* Return the linker hash table entry of a symbol that might be
5745 satisfied by an archive symbol. Return -1 on error. */
5747 struct bfd_link_hash_entry
*
5748 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5749 struct bfd_link_info
*info
,
5752 struct bfd_link_hash_entry
*h
;
5756 h
= bfd_link_hash_lookup (info
->hash
, name
, false, false, true);
5760 /* If this is a default version (the name contains @@), look up the
5761 symbol again with only one `@' as well as without the version.
5762 The effect is that references to the symbol with and without the
5763 version will be matched by the default symbol in the archive. */
5765 p
= strchr (name
, ELF_VER_CHR
);
5766 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5769 /* First check with only one `@'. */
5770 len
= strlen (name
);
5771 copy
= (char *) bfd_alloc (abfd
, len
);
5773 return (struct bfd_link_hash_entry
*) -1;
5775 first
= p
- name
+ 1;
5776 memcpy (copy
, name
, first
);
5777 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5779 h
= bfd_link_hash_lookup (info
->hash
, copy
, false, false, true);
5782 /* We also need to check references to the symbol without the
5784 copy
[first
- 1] = '\0';
5785 h
= bfd_link_hash_lookup (info
->hash
, copy
, false, false, true);
5788 bfd_release (abfd
, copy
);
5792 /* Add symbols from an ELF archive file to the linker hash table. We
5793 don't use _bfd_generic_link_add_archive_symbols because we need to
5794 handle versioned symbols.
5796 Fortunately, ELF archive handling is simpler than that done by
5797 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5798 oddities. In ELF, if we find a symbol in the archive map, and the
5799 symbol is currently undefined, we know that we must pull in that
5802 Unfortunately, we do have to make multiple passes over the symbol
5803 table until nothing further is resolved. */
5806 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5809 unsigned char *included
= NULL
;
5813 const struct elf_backend_data
*bed
;
5814 struct bfd_link_hash_entry
* (*archive_symbol_lookup
)
5815 (bfd
*, struct bfd_link_info
*, const char *);
5817 if (! bfd_has_map (abfd
))
5819 /* An empty archive is a special case. */
5820 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5822 bfd_set_error (bfd_error_no_armap
);
5826 /* Keep track of all symbols we know to be already defined, and all
5827 files we know to be already included. This is to speed up the
5828 second and subsequent passes. */
5829 c
= bfd_ardata (abfd
)->symdef_count
;
5832 amt
= c
* sizeof (*included
);
5833 included
= (unsigned char *) bfd_zmalloc (amt
);
5834 if (included
== NULL
)
5837 symdefs
= bfd_ardata (abfd
)->symdefs
;
5838 bed
= get_elf_backend_data (abfd
);
5839 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5852 symdefend
= symdef
+ c
;
5853 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5855 struct bfd_link_hash_entry
*h
;
5857 struct bfd_link_hash_entry
*undefs_tail
;
5862 if (symdef
->file_offset
== last
)
5868 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5869 if (h
== (struct bfd_link_hash_entry
*) -1)
5875 if (h
->type
== bfd_link_hash_undefined
)
5877 /* If the archive element has already been loaded then one
5878 of the symbols defined by that element might have been
5879 made undefined due to being in a discarded section. */
5880 if (is_elf_hash_table (info
->hash
)
5881 && ((struct elf_link_hash_entry
*) h
)->indx
== -3)
5884 else if (h
->type
== bfd_link_hash_common
)
5886 /* We currently have a common symbol. The archive map contains
5887 a reference to this symbol, so we may want to include it. We
5888 only want to include it however, if this archive element
5889 contains a definition of the symbol, not just another common
5892 Unfortunately some archivers (including GNU ar) will put
5893 declarations of common symbols into their archive maps, as
5894 well as real definitions, so we cannot just go by the archive
5895 map alone. Instead we must read in the element's symbol
5896 table and check that to see what kind of symbol definition
5898 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5903 if (h
->type
!= bfd_link_hash_undefweak
)
5904 /* Symbol must be defined. Don't check it again. */
5909 /* We need to include this archive member. */
5910 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5911 if (element
== NULL
)
5914 if (! bfd_check_format (element
, bfd_object
))
5917 undefs_tail
= info
->hash
->undefs_tail
;
5919 if (!(*info
->callbacks
5920 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5922 if (!bfd_link_add_symbols (element
, info
))
5925 /* If there are any new undefined symbols, we need to make
5926 another pass through the archive in order to see whether
5927 they can be defined. FIXME: This isn't perfect, because
5928 common symbols wind up on undefs_tail and because an
5929 undefined symbol which is defined later on in this pass
5930 does not require another pass. This isn't a bug, but it
5931 does make the code less efficient than it could be. */
5932 if (undefs_tail
!= info
->hash
->undefs_tail
)
5935 /* Look backward to mark all symbols from this object file
5936 which we have already seen in this pass. */
5940 included
[mark
] = true;
5945 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5947 /* We mark subsequent symbols from this object file as we go
5948 on through the loop. */
5949 last
= symdef
->file_offset
;
5962 /* Given an ELF BFD, add symbols to the global hash table as
5966 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5968 switch (bfd_get_format (abfd
))
5971 return elf_link_add_object_symbols (abfd
, info
);
5973 return elf_link_add_archive_symbols (abfd
, info
);
5975 bfd_set_error (bfd_error_wrong_format
);
5980 struct hash_codes_info
5982 unsigned long *hashcodes
;
5986 /* This function will be called though elf_link_hash_traverse to store
5987 all hash value of the exported symbols in an array. */
5990 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5992 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5997 /* Ignore indirect symbols. These are added by the versioning code. */
5998 if (h
->dynindx
== -1)
6001 name
= h
->root
.root
.string
;
6002 if (h
->versioned
>= versioned
)
6004 char *p
= strchr (name
, ELF_VER_CHR
);
6007 alc
= (char *) bfd_malloc (p
- name
+ 1);
6013 memcpy (alc
, name
, p
- name
);
6014 alc
[p
- name
] = '\0';
6019 /* Compute the hash value. */
6020 ha
= bfd_elf_hash (name
);
6022 /* Store the found hash value in the array given as the argument. */
6023 *(inf
->hashcodes
)++ = ha
;
6025 /* And store it in the struct so that we can put it in the hash table
6027 h
->u
.elf_hash_value
= ha
;
6033 struct collect_gnu_hash_codes
6036 const struct elf_backend_data
*bed
;
6037 unsigned long int nsyms
;
6038 unsigned long int maskbits
;
6039 unsigned long int *hashcodes
;
6040 unsigned long int *hashval
;
6041 unsigned long int *indx
;
6042 unsigned long int *counts
;
6046 long int min_dynindx
;
6047 unsigned long int bucketcount
;
6048 unsigned long int symindx
;
6049 long int local_indx
;
6050 long int shift1
, shift2
;
6051 unsigned long int mask
;
6055 /* This function will be called though elf_link_hash_traverse to store
6056 all hash value of the exported symbols in an array. */
6059 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6061 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6066 /* Ignore indirect symbols. These are added by the versioning code. */
6067 if (h
->dynindx
== -1)
6070 /* Ignore also local symbols and undefined symbols. */
6071 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6074 name
= h
->root
.root
.string
;
6075 if (h
->versioned
>= versioned
)
6077 char *p
= strchr (name
, ELF_VER_CHR
);
6080 alc
= (char *) bfd_malloc (p
- name
+ 1);
6086 memcpy (alc
, name
, p
- name
);
6087 alc
[p
- name
] = '\0';
6092 /* Compute the hash value. */
6093 ha
= bfd_elf_gnu_hash (name
);
6095 /* Store the found hash value in the array for compute_bucket_count,
6096 and also for .dynsym reordering purposes. */
6097 s
->hashcodes
[s
->nsyms
] = ha
;
6098 s
->hashval
[h
->dynindx
] = ha
;
6100 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6101 s
->min_dynindx
= h
->dynindx
;
6107 /* This function will be called though elf_link_hash_traverse to do
6108 final dynamic symbol renumbering in case of .gnu.hash.
6109 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6110 to the translation table. */
6113 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6115 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6116 unsigned long int bucket
;
6117 unsigned long int val
;
6119 /* Ignore indirect symbols. */
6120 if (h
->dynindx
== -1)
6123 /* Ignore also local symbols and undefined symbols. */
6124 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6126 if (h
->dynindx
>= s
->min_dynindx
)
6128 if (s
->bed
->record_xhash_symbol
!= NULL
)
6130 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6134 h
->dynindx
= s
->local_indx
++;
6139 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6140 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6141 & ((s
->maskbits
>> s
->shift1
) - 1);
6142 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6144 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6145 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6146 if (s
->counts
[bucket
] == 1)
6147 /* Last element terminates the chain. */
6149 bfd_put_32 (s
->output_bfd
, val
,
6150 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6151 --s
->counts
[bucket
];
6152 if (s
->bed
->record_xhash_symbol
!= NULL
)
6154 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6156 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6159 h
->dynindx
= s
->indx
[bucket
]++;
6163 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6166 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6168 return !(h
->forced_local
6169 || h
->root
.type
== bfd_link_hash_undefined
6170 || h
->root
.type
== bfd_link_hash_undefweak
6171 || ((h
->root
.type
== bfd_link_hash_defined
6172 || h
->root
.type
== bfd_link_hash_defweak
)
6173 && h
->root
.u
.def
.section
->output_section
== NULL
));
6176 /* Array used to determine the number of hash table buckets to use
6177 based on the number of symbols there are. If there are fewer than
6178 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6179 fewer than 37 we use 17 buckets, and so forth. We never use more
6180 than 32771 buckets. */
6182 static const size_t elf_buckets
[] =
6184 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6188 /* Compute bucket count for hashing table. We do not use a static set
6189 of possible tables sizes anymore. Instead we determine for all
6190 possible reasonable sizes of the table the outcome (i.e., the
6191 number of collisions etc) and choose the best solution. The
6192 weighting functions are not too simple to allow the table to grow
6193 without bounds. Instead one of the weighting factors is the size.
6194 Therefore the result is always a good payoff between few collisions
6195 (= short chain lengths) and table size. */
6197 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6198 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6199 unsigned long int nsyms
,
6202 size_t best_size
= 0;
6203 unsigned long int i
;
6205 /* We have a problem here. The following code to optimize the table
6206 size requires an integer type with more the 32 bits. If
6207 BFD_HOST_U_64_BIT is set we know about such a type. */
6208 #ifdef BFD_HOST_U_64_BIT
6213 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6214 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6215 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6216 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6217 unsigned long int *counts
;
6219 unsigned int no_improvement_count
= 0;
6221 /* Possible optimization parameters: if we have NSYMS symbols we say
6222 that the hashing table must at least have NSYMS/4 and at most
6224 minsize
= nsyms
/ 4;
6227 best_size
= maxsize
= nsyms
* 2;
6232 if ((best_size
& 31) == 0)
6236 /* Create array where we count the collisions in. We must use bfd_malloc
6237 since the size could be large. */
6239 amt
*= sizeof (unsigned long int);
6240 counts
= (unsigned long int *) bfd_malloc (amt
);
6244 /* Compute the "optimal" size for the hash table. The criteria is a
6245 minimal chain length. The minor criteria is (of course) the size
6247 for (i
= minsize
; i
< maxsize
; ++i
)
6249 /* Walk through the array of hashcodes and count the collisions. */
6250 BFD_HOST_U_64_BIT max
;
6251 unsigned long int j
;
6252 unsigned long int fact
;
6254 if (gnu_hash
&& (i
& 31) == 0)
6257 memset (counts
, '\0', i
* sizeof (unsigned long int));
6259 /* Determine how often each hash bucket is used. */
6260 for (j
= 0; j
< nsyms
; ++j
)
6261 ++counts
[hashcodes
[j
] % i
];
6263 /* For the weight function we need some information about the
6264 pagesize on the target. This is information need not be 100%
6265 accurate. Since this information is not available (so far) we
6266 define it here to a reasonable default value. If it is crucial
6267 to have a better value some day simply define this value. */
6268 # ifndef BFD_TARGET_PAGESIZE
6269 # define BFD_TARGET_PAGESIZE (4096)
6272 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6274 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6277 /* Variant 1: optimize for short chains. We add the squares
6278 of all the chain lengths (which favors many small chain
6279 over a few long chains). */
6280 for (j
= 0; j
< i
; ++j
)
6281 max
+= counts
[j
] * counts
[j
];
6283 /* This adds penalties for the overall size of the table. */
6284 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6287 /* Variant 2: Optimize a lot more for small table. Here we
6288 also add squares of the size but we also add penalties for
6289 empty slots (the +1 term). */
6290 for (j
= 0; j
< i
; ++j
)
6291 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6293 /* The overall size of the table is considered, but not as
6294 strong as in variant 1, where it is squared. */
6295 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6299 /* Compare with current best results. */
6300 if (max
< best_chlen
)
6304 no_improvement_count
= 0;
6306 /* PR 11843: Avoid futile long searches for the best bucket size
6307 when there are a large number of symbols. */
6308 else if (++no_improvement_count
== 100)
6315 #endif /* defined (BFD_HOST_U_64_BIT) */
6317 /* This is the fallback solution if no 64bit type is available or if we
6318 are not supposed to spend much time on optimizations. We select the
6319 bucket count using a fixed set of numbers. */
6320 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6322 best_size
= elf_buckets
[i
];
6323 if (nsyms
< elf_buckets
[i
+ 1])
6326 if (gnu_hash
&& best_size
< 2)
6333 /* Size any SHT_GROUP section for ld -r. */
6336 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6341 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6342 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6343 && (s
= ibfd
->sections
) != NULL
6344 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6345 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6350 /* Set a default stack segment size. The value in INFO wins. If it
6351 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6352 undefined it is initialized. */
6355 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6356 struct bfd_link_info
*info
,
6357 const char *legacy_symbol
,
6358 bfd_vma default_size
)
6360 struct elf_link_hash_entry
*h
= NULL
;
6362 /* Look for legacy symbol. */
6364 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6365 false, false, false);
6366 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6367 || h
->root
.type
== bfd_link_hash_defweak
)
6369 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6371 /* The symbol has no type if specified on the command line. */
6372 h
->type
= STT_OBJECT
;
6373 if (info
->stacksize
)
6374 /* xgettext:c-format */
6375 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6376 output_bfd
, legacy_symbol
);
6377 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6378 /* xgettext:c-format */
6379 _bfd_error_handler (_("%pB: %s not absolute"),
6380 output_bfd
, legacy_symbol
);
6382 info
->stacksize
= h
->root
.u
.def
.value
;
6385 if (!info
->stacksize
)
6386 /* If the user didn't set a size, or explicitly inhibit the
6387 size, set it now. */
6388 info
->stacksize
= default_size
;
6390 /* Provide the legacy symbol, if it is referenced. */
6391 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6392 || h
->root
.type
== bfd_link_hash_undefweak
))
6394 struct bfd_link_hash_entry
*bh
= NULL
;
6396 if (!(_bfd_generic_link_add_one_symbol
6397 (info
, output_bfd
, legacy_symbol
,
6398 BSF_GLOBAL
, bfd_abs_section_ptr
,
6399 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6400 NULL
, false, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6403 h
= (struct elf_link_hash_entry
*) bh
;
6405 h
->type
= STT_OBJECT
;
6411 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6413 struct elf_gc_sweep_symbol_info
6415 struct bfd_link_info
*info
;
6416 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6421 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6424 && (((h
->root
.type
== bfd_link_hash_defined
6425 || h
->root
.type
== bfd_link_hash_defweak
)
6426 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6427 && h
->root
.u
.def
.section
->gc_mark
))
6428 || h
->root
.type
== bfd_link_hash_undefined
6429 || h
->root
.type
== bfd_link_hash_undefweak
))
6431 struct elf_gc_sweep_symbol_info
*inf
;
6433 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6434 (*inf
->hide_symbol
) (inf
->info
, h
, true);
6437 h
->ref_regular_nonweak
= 0;
6443 /* Set up the sizes and contents of the ELF dynamic sections. This is
6444 called by the ELF linker emulation before_allocation routine. We
6445 must set the sizes of the sections before the linker sets the
6446 addresses of the various sections. */
6449 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6452 const char *filter_shlib
,
6454 const char *depaudit
,
6455 const char * const *auxiliary_filters
,
6456 struct bfd_link_info
*info
,
6457 asection
**sinterpptr
)
6460 const struct elf_backend_data
*bed
;
6464 if (!is_elf_hash_table (info
->hash
))
6467 dynobj
= elf_hash_table (info
)->dynobj
;
6469 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6471 struct bfd_elf_version_tree
*verdefs
;
6472 struct elf_info_failed asvinfo
;
6473 struct bfd_elf_version_tree
*t
;
6474 struct bfd_elf_version_expr
*d
;
6478 /* If we are supposed to export all symbols into the dynamic symbol
6479 table (this is not the normal case), then do so. */
6480 if (info
->export_dynamic
6481 || (bfd_link_executable (info
) && info
->dynamic
))
6483 struct elf_info_failed eif
;
6487 elf_link_hash_traverse (elf_hash_table (info
),
6488 _bfd_elf_export_symbol
,
6496 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6498 if (soname_indx
== (size_t) -1
6499 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6503 soname_indx
= (size_t) -1;
6505 /* Make all global versions with definition. */
6506 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6507 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6508 if (!d
->symver
&& d
->literal
)
6510 const char *verstr
, *name
;
6511 size_t namelen
, verlen
, newlen
;
6512 char *newname
, *p
, leading_char
;
6513 struct elf_link_hash_entry
*newh
;
6515 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6517 namelen
= strlen (name
) + (leading_char
!= '\0');
6519 verlen
= strlen (verstr
);
6520 newlen
= namelen
+ verlen
+ 3;
6522 newname
= (char *) bfd_malloc (newlen
);
6523 if (newname
== NULL
)
6525 newname
[0] = leading_char
;
6526 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6528 /* Check the hidden versioned definition. */
6529 p
= newname
+ namelen
;
6531 memcpy (p
, verstr
, verlen
+ 1);
6532 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6533 newname
, false, false,
6536 || (newh
->root
.type
!= bfd_link_hash_defined
6537 && newh
->root
.type
!= bfd_link_hash_defweak
))
6539 /* Check the default versioned definition. */
6541 memcpy (p
, verstr
, verlen
+ 1);
6542 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6543 newname
, false, false,
6548 /* Mark this version if there is a definition and it is
6549 not defined in a shared object. */
6551 && !newh
->def_dynamic
6552 && (newh
->root
.type
== bfd_link_hash_defined
6553 || newh
->root
.type
== bfd_link_hash_defweak
))
6557 /* Attach all the symbols to their version information. */
6558 asvinfo
.info
= info
;
6559 asvinfo
.failed
= false;
6561 elf_link_hash_traverse (elf_hash_table (info
),
6562 _bfd_elf_link_assign_sym_version
,
6567 if (!info
->allow_undefined_version
)
6569 /* Check if all global versions have a definition. */
6570 bool all_defined
= true;
6571 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6572 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6573 if (d
->literal
&& !d
->symver
&& !d
->script
)
6576 (_("%s: undefined version: %s"),
6577 d
->pattern
, t
->name
);
6578 all_defined
= false;
6583 bfd_set_error (bfd_error_bad_value
);
6588 /* Set up the version definition section. */
6589 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6590 BFD_ASSERT (s
!= NULL
);
6592 /* We may have created additional version definitions if we are
6593 just linking a regular application. */
6594 verdefs
= info
->version_info
;
6596 /* Skip anonymous version tag. */
6597 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6598 verdefs
= verdefs
->next
;
6600 if (verdefs
== NULL
&& !info
->create_default_symver
)
6601 s
->flags
|= SEC_EXCLUDE
;
6607 Elf_Internal_Verdef def
;
6608 Elf_Internal_Verdaux defaux
;
6609 struct bfd_link_hash_entry
*bh
;
6610 struct elf_link_hash_entry
*h
;
6616 /* Make space for the base version. */
6617 size
+= sizeof (Elf_External_Verdef
);
6618 size
+= sizeof (Elf_External_Verdaux
);
6621 /* Make space for the default version. */
6622 if (info
->create_default_symver
)
6624 size
+= sizeof (Elf_External_Verdef
);
6628 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6630 struct bfd_elf_version_deps
*n
;
6632 /* Don't emit base version twice. */
6636 size
+= sizeof (Elf_External_Verdef
);
6637 size
+= sizeof (Elf_External_Verdaux
);
6640 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6641 size
+= sizeof (Elf_External_Verdaux
);
6645 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6646 if (s
->contents
== NULL
&& s
->size
!= 0)
6649 /* Fill in the version definition section. */
6653 def
.vd_version
= VER_DEF_CURRENT
;
6654 def
.vd_flags
= VER_FLG_BASE
;
6657 if (info
->create_default_symver
)
6659 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6660 def
.vd_next
= sizeof (Elf_External_Verdef
);
6664 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6665 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6666 + sizeof (Elf_External_Verdaux
));
6669 if (soname_indx
!= (size_t) -1)
6671 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6673 def
.vd_hash
= bfd_elf_hash (soname
);
6674 defaux
.vda_name
= soname_indx
;
6681 name
= lbasename (bfd_get_filename (output_bfd
));
6682 def
.vd_hash
= bfd_elf_hash (name
);
6683 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6685 if (indx
== (size_t) -1)
6687 defaux
.vda_name
= indx
;
6689 defaux
.vda_next
= 0;
6691 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6692 (Elf_External_Verdef
*) p
);
6693 p
+= sizeof (Elf_External_Verdef
);
6694 if (info
->create_default_symver
)
6696 /* Add a symbol representing this version. */
6698 if (! (_bfd_generic_link_add_one_symbol
6699 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6701 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6703 h
= (struct elf_link_hash_entry
*) bh
;
6706 h
->type
= STT_OBJECT
;
6707 h
->verinfo
.vertree
= NULL
;
6709 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6712 /* Create a duplicate of the base version with the same
6713 aux block, but different flags. */
6716 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6718 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6719 + sizeof (Elf_External_Verdaux
));
6722 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6723 (Elf_External_Verdef
*) p
);
6724 p
+= sizeof (Elf_External_Verdef
);
6726 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6727 (Elf_External_Verdaux
*) p
);
6728 p
+= sizeof (Elf_External_Verdaux
);
6730 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6733 struct bfd_elf_version_deps
*n
;
6735 /* Don't emit the base version twice. */
6740 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6743 /* Add a symbol representing this version. */
6745 if (! (_bfd_generic_link_add_one_symbol
6746 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6748 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6750 h
= (struct elf_link_hash_entry
*) bh
;
6753 h
->type
= STT_OBJECT
;
6754 h
->verinfo
.vertree
= t
;
6756 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6759 def
.vd_version
= VER_DEF_CURRENT
;
6761 if (t
->globals
.list
== NULL
6762 && t
->locals
.list
== NULL
6764 def
.vd_flags
|= VER_FLG_WEAK
;
6765 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6766 def
.vd_cnt
= cdeps
+ 1;
6767 def
.vd_hash
= bfd_elf_hash (t
->name
);
6768 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6771 /* If a basever node is next, it *must* be the last node in
6772 the chain, otherwise Verdef construction breaks. */
6773 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6774 BFD_ASSERT (t
->next
->next
== NULL
);
6776 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6777 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6778 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6780 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6781 (Elf_External_Verdef
*) p
);
6782 p
+= sizeof (Elf_External_Verdef
);
6784 defaux
.vda_name
= h
->dynstr_index
;
6785 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6787 defaux
.vda_next
= 0;
6788 if (t
->deps
!= NULL
)
6789 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6790 t
->name_indx
= defaux
.vda_name
;
6792 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6793 (Elf_External_Verdaux
*) p
);
6794 p
+= sizeof (Elf_External_Verdaux
);
6796 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6798 if (n
->version_needed
== NULL
)
6800 /* This can happen if there was an error in the
6802 defaux
.vda_name
= 0;
6806 defaux
.vda_name
= n
->version_needed
->name_indx
;
6807 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6810 if (n
->next
== NULL
)
6811 defaux
.vda_next
= 0;
6813 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6815 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6816 (Elf_External_Verdaux
*) p
);
6817 p
+= sizeof (Elf_External_Verdaux
);
6821 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6825 bed
= get_elf_backend_data (output_bfd
);
6827 if (info
->gc_sections
&& bed
->can_gc_sections
)
6829 struct elf_gc_sweep_symbol_info sweep_info
;
6831 /* Remove the symbols that were in the swept sections from the
6832 dynamic symbol table. */
6833 sweep_info
.info
= info
;
6834 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6835 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6839 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6842 struct elf_find_verdep_info sinfo
;
6844 /* Work out the size of the version reference section. */
6846 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6847 BFD_ASSERT (s
!= NULL
);
6850 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6851 if (sinfo
.vers
== 0)
6853 sinfo
.failed
= false;
6855 elf_link_hash_traverse (elf_hash_table (info
),
6856 _bfd_elf_link_find_version_dependencies
,
6861 if (elf_tdata (output_bfd
)->verref
== NULL
)
6862 s
->flags
|= SEC_EXCLUDE
;
6865 Elf_Internal_Verneed
*vn
;
6870 /* Build the version dependency section. */
6873 for (vn
= elf_tdata (output_bfd
)->verref
;
6875 vn
= vn
->vn_nextref
)
6877 Elf_Internal_Vernaux
*a
;
6879 size
+= sizeof (Elf_External_Verneed
);
6881 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6882 size
+= sizeof (Elf_External_Vernaux
);
6886 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6887 if (s
->contents
== NULL
)
6891 for (vn
= elf_tdata (output_bfd
)->verref
;
6893 vn
= vn
->vn_nextref
)
6896 Elf_Internal_Vernaux
*a
;
6900 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6903 vn
->vn_version
= VER_NEED_CURRENT
;
6905 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6906 elf_dt_name (vn
->vn_bfd
) != NULL
6907 ? elf_dt_name (vn
->vn_bfd
)
6908 : lbasename (bfd_get_filename
6911 if (indx
== (size_t) -1)
6914 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6915 if (vn
->vn_nextref
== NULL
)
6918 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6919 + caux
* sizeof (Elf_External_Vernaux
));
6921 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6922 (Elf_External_Verneed
*) p
);
6923 p
+= sizeof (Elf_External_Verneed
);
6925 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6927 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6928 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6929 a
->vna_nodename
, false);
6930 if (indx
== (size_t) -1)
6933 if (a
->vna_nextptr
== NULL
)
6936 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6938 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6939 (Elf_External_Vernaux
*) p
);
6940 p
+= sizeof (Elf_External_Vernaux
);
6944 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6948 /* Any syms created from now on start with -1 in
6949 got.refcount/offset and plt.refcount/offset. */
6950 elf_hash_table (info
)->init_got_refcount
6951 = elf_hash_table (info
)->init_got_offset
;
6952 elf_hash_table (info
)->init_plt_refcount
6953 = elf_hash_table (info
)->init_plt_offset
;
6955 if (bfd_link_relocatable (info
)
6956 && !_bfd_elf_size_group_sections (info
))
6959 /* The backend may have to create some sections regardless of whether
6960 we're dynamic or not. */
6961 if (bed
->elf_backend_always_size_sections
6962 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6965 /* Determine any GNU_STACK segment requirements, after the backend
6966 has had a chance to set a default segment size. */
6967 if (info
->execstack
)
6968 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6969 else if (info
->noexecstack
)
6970 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6974 asection
*notesec
= NULL
;
6977 for (inputobj
= info
->input_bfds
;
6979 inputobj
= inputobj
->link
.next
)
6984 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6986 s
= inputobj
->sections
;
6987 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6990 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6993 if (s
->flags
& SEC_CODE
)
6997 else if (bed
->default_execstack
)
7000 if (notesec
|| info
->stacksize
> 0)
7001 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
7002 if (notesec
&& exec
&& bfd_link_relocatable (info
)
7003 && notesec
->output_section
!= bfd_abs_section_ptr
)
7004 notesec
->output_section
->flags
|= SEC_CODE
;
7007 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7009 struct elf_info_failed eif
;
7010 struct elf_link_hash_entry
*h
;
7014 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
7015 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
7019 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
7021 info
->flags
|= DF_SYMBOLIC
;
7029 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
7031 if (indx
== (size_t) -1)
7034 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
7035 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
7039 if (filter_shlib
!= NULL
)
7043 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7044 filter_shlib
, true);
7045 if (indx
== (size_t) -1
7046 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
7050 if (auxiliary_filters
!= NULL
)
7052 const char * const *p
;
7054 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
7058 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7060 if (indx
== (size_t) -1
7061 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7070 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7072 if (indx
== (size_t) -1
7073 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7077 if (depaudit
!= NULL
)
7081 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7083 if (indx
== (size_t) -1
7084 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7091 /* Find all symbols which were defined in a dynamic object and make
7092 the backend pick a reasonable value for them. */
7093 elf_link_hash_traverse (elf_hash_table (info
),
7094 _bfd_elf_adjust_dynamic_symbol
,
7099 /* Add some entries to the .dynamic section. We fill in some of the
7100 values later, in bfd_elf_final_link, but we must add the entries
7101 now so that we know the final size of the .dynamic section. */
7103 /* If there are initialization and/or finalization functions to
7104 call then add the corresponding DT_INIT/DT_FINI entries. */
7105 h
= (info
->init_function
7106 ? elf_link_hash_lookup (elf_hash_table (info
),
7107 info
->init_function
, false,
7114 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7117 h
= (info
->fini_function
7118 ? elf_link_hash_lookup (elf_hash_table (info
),
7119 info
->fini_function
, false,
7126 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7130 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7131 if (s
!= NULL
&& s
->linker_has_input
)
7133 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7134 if (! bfd_link_executable (info
))
7139 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7140 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7141 && (o
= sub
->sections
) != NULL
7142 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7143 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7144 if (elf_section_data (o
)->this_hdr
.sh_type
7145 == SHT_PREINIT_ARRAY
)
7148 (_("%pB: .preinit_array section is not allowed in DSO"),
7153 bfd_set_error (bfd_error_nonrepresentable_section
);
7157 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7158 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7161 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7162 if (s
!= NULL
&& s
->linker_has_input
)
7164 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7165 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7168 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7169 if (s
!= NULL
&& s
->linker_has_input
)
7171 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7172 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7176 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7177 /* If .dynstr is excluded from the link, we don't want any of
7178 these tags. Strictly, we should be checking each section
7179 individually; This quick check covers for the case where
7180 someone does a /DISCARD/ : { *(*) }. */
7181 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7183 bfd_size_type strsize
;
7185 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7186 if ((info
->emit_hash
7187 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7188 || (info
->emit_gnu_hash
7189 && (bed
->record_xhash_symbol
== NULL
7190 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7191 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7192 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7193 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7194 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7196 || (info
->gnu_flags_1
7197 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_FLAGS_1
,
7198 info
->gnu_flags_1
)))
7203 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7206 /* The backend must work out the sizes of all the other dynamic
7209 && bed
->elf_backend_size_dynamic_sections
!= NULL
7210 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7213 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7215 if (elf_tdata (output_bfd
)->cverdefs
)
7217 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7219 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7220 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7224 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7226 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7229 else if (info
->flags
& DF_BIND_NOW
)
7231 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7237 if (bfd_link_executable (info
))
7238 info
->flags_1
&= ~ (DF_1_INITFIRST
7241 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7245 if (elf_tdata (output_bfd
)->cverrefs
)
7247 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7249 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7250 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7254 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7255 && elf_tdata (output_bfd
)->cverdefs
== 0)
7256 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7260 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7261 s
->flags
|= SEC_EXCLUDE
;
7267 /* Find the first non-excluded output section. We'll use its
7268 section symbol for some emitted relocs. */
7270 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7273 asection
*found
= NULL
;
7275 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7276 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7277 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7280 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7283 elf_hash_table (info
)->text_index_section
= found
;
7286 /* Find two non-excluded output sections, one for code, one for data.
7287 We'll use their section symbols for some emitted relocs. */
7289 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7292 asection
*found
= NULL
;
7294 /* Data first, since setting text_index_section changes
7295 _bfd_elf_omit_section_dynsym_default. */
7296 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7297 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7298 && !(s
->flags
& SEC_READONLY
)
7299 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7302 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7305 elf_hash_table (info
)->data_index_section
= found
;
7307 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7308 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7309 && (s
->flags
& SEC_READONLY
)
7310 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7315 elf_hash_table (info
)->text_index_section
= found
;
7318 #define GNU_HASH_SECTION_NAME(bed) \
7319 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7322 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7324 const struct elf_backend_data
*bed
;
7325 unsigned long section_sym_count
;
7326 bfd_size_type dynsymcount
= 0;
7328 if (!is_elf_hash_table (info
->hash
))
7331 bed
= get_elf_backend_data (output_bfd
);
7332 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7334 /* Assign dynsym indices. In a shared library we generate a section
7335 symbol for each output section, which come first. Next come all
7336 of the back-end allocated local dynamic syms, followed by the rest
7337 of the global symbols.
7339 This is usually not needed for static binaries, however backends
7340 can request to always do it, e.g. the MIPS backend uses dynamic
7341 symbol counts to lay out GOT, which will be produced in the
7342 presence of GOT relocations even in static binaries (holding fixed
7343 data in that case, to satisfy those relocations). */
7345 if (elf_hash_table (info
)->dynamic_sections_created
7346 || bed
->always_renumber_dynsyms
)
7347 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7348 §ion_sym_count
);
7350 if (elf_hash_table (info
)->dynamic_sections_created
)
7354 unsigned int dtagcount
;
7356 dynobj
= elf_hash_table (info
)->dynobj
;
7358 /* Work out the size of the symbol version section. */
7359 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7360 BFD_ASSERT (s
!= NULL
);
7361 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7363 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7364 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7365 if (s
->contents
== NULL
)
7368 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7372 /* Set the size of the .dynsym and .hash sections. We counted
7373 the number of dynamic symbols in elf_link_add_object_symbols.
7374 We will build the contents of .dynsym and .hash when we build
7375 the final symbol table, because until then we do not know the
7376 correct value to give the symbols. We built the .dynstr
7377 section as we went along in elf_link_add_object_symbols. */
7378 s
= elf_hash_table (info
)->dynsym
;
7379 BFD_ASSERT (s
!= NULL
);
7380 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7382 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7383 if (s
->contents
== NULL
)
7386 /* The first entry in .dynsym is a dummy symbol. Clear all the
7387 section syms, in case we don't output them all. */
7388 ++section_sym_count
;
7389 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7391 elf_hash_table (info
)->bucketcount
= 0;
7393 /* Compute the size of the hashing table. As a side effect this
7394 computes the hash values for all the names we export. */
7395 if (info
->emit_hash
)
7397 unsigned long int *hashcodes
;
7398 struct hash_codes_info hashinf
;
7400 unsigned long int nsyms
;
7402 size_t hash_entry_size
;
7404 /* Compute the hash values for all exported symbols. At the same
7405 time store the values in an array so that we could use them for
7407 amt
= dynsymcount
* sizeof (unsigned long int);
7408 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7409 if (hashcodes
== NULL
)
7411 hashinf
.hashcodes
= hashcodes
;
7412 hashinf
.error
= false;
7414 /* Put all hash values in HASHCODES. */
7415 elf_link_hash_traverse (elf_hash_table (info
),
7416 elf_collect_hash_codes
, &hashinf
);
7423 nsyms
= hashinf
.hashcodes
- hashcodes
;
7425 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7428 if (bucketcount
== 0 && nsyms
> 0)
7431 elf_hash_table (info
)->bucketcount
= bucketcount
;
7433 s
= bfd_get_linker_section (dynobj
, ".hash");
7434 BFD_ASSERT (s
!= NULL
);
7435 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7436 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7437 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7438 if (s
->contents
== NULL
)
7441 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7442 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7443 s
->contents
+ hash_entry_size
);
7446 if (info
->emit_gnu_hash
)
7449 unsigned char *contents
;
7450 struct collect_gnu_hash_codes cinfo
;
7454 memset (&cinfo
, 0, sizeof (cinfo
));
7456 /* Compute the hash values for all exported symbols. At the same
7457 time store the values in an array so that we could use them for
7459 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7460 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7461 if (cinfo
.hashcodes
== NULL
)
7464 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7465 cinfo
.min_dynindx
= -1;
7466 cinfo
.output_bfd
= output_bfd
;
7469 /* Put all hash values in HASHCODES. */
7470 elf_link_hash_traverse (elf_hash_table (info
),
7471 elf_collect_gnu_hash_codes
, &cinfo
);
7474 free (cinfo
.hashcodes
);
7479 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7481 if (bucketcount
== 0)
7483 free (cinfo
.hashcodes
);
7487 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7488 BFD_ASSERT (s
!= NULL
);
7490 if (cinfo
.nsyms
== 0)
7492 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7493 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7494 free (cinfo
.hashcodes
);
7495 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7496 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7497 if (contents
== NULL
)
7499 s
->contents
= contents
;
7500 /* 1 empty bucket. */
7501 bfd_put_32 (output_bfd
, 1, contents
);
7502 /* SYMIDX above the special symbol 0. */
7503 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7504 /* Just one word for bitmask. */
7505 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7506 /* Only hash fn bloom filter. */
7507 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7508 /* No hashes are valid - empty bitmask. */
7509 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7510 /* No hashes in the only bucket. */
7511 bfd_put_32 (output_bfd
, 0,
7512 contents
+ 16 + bed
->s
->arch_size
/ 8);
7516 unsigned long int maskwords
, maskbitslog2
, x
;
7517 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7521 while ((x
>>= 1) != 0)
7523 if (maskbitslog2
< 3)
7525 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7526 maskbitslog2
= maskbitslog2
+ 3;
7528 maskbitslog2
= maskbitslog2
+ 2;
7529 if (bed
->s
->arch_size
== 64)
7531 if (maskbitslog2
== 5)
7537 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7538 cinfo
.shift2
= maskbitslog2
;
7539 cinfo
.maskbits
= 1 << maskbitslog2
;
7540 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7541 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7542 amt
+= maskwords
* sizeof (bfd_vma
);
7543 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7544 if (cinfo
.bitmask
== NULL
)
7546 free (cinfo
.hashcodes
);
7550 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7551 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7552 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7553 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7555 /* Determine how often each hash bucket is used. */
7556 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7557 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7558 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7560 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7561 if (cinfo
.counts
[i
] != 0)
7563 cinfo
.indx
[i
] = cnt
;
7564 cnt
+= cinfo
.counts
[i
];
7566 BFD_ASSERT (cnt
== dynsymcount
);
7567 cinfo
.bucketcount
= bucketcount
;
7568 cinfo
.local_indx
= cinfo
.min_dynindx
;
7570 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7571 s
->size
+= cinfo
.maskbits
/ 8;
7572 if (bed
->record_xhash_symbol
!= NULL
)
7573 s
->size
+= cinfo
.nsyms
* 4;
7574 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7575 if (contents
== NULL
)
7577 free (cinfo
.bitmask
);
7578 free (cinfo
.hashcodes
);
7582 s
->contents
= contents
;
7583 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7584 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7585 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7586 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7587 contents
+= 16 + cinfo
.maskbits
/ 8;
7589 for (i
= 0; i
< bucketcount
; ++i
)
7591 if (cinfo
.counts
[i
] == 0)
7592 bfd_put_32 (output_bfd
, 0, contents
);
7594 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7598 cinfo
.contents
= contents
;
7600 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7601 /* Renumber dynamic symbols, if populating .gnu.hash section.
7602 If using .MIPS.xhash, populate the translation table. */
7603 elf_link_hash_traverse (elf_hash_table (info
),
7604 elf_gnu_hash_process_symidx
, &cinfo
);
7606 contents
= s
->contents
+ 16;
7607 for (i
= 0; i
< maskwords
; ++i
)
7609 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7611 contents
+= bed
->s
->arch_size
/ 8;
7614 free (cinfo
.bitmask
);
7615 free (cinfo
.hashcodes
);
7619 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7620 BFD_ASSERT (s
!= NULL
);
7622 elf_finalize_dynstr (output_bfd
, info
);
7624 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7626 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7627 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7634 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7637 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7640 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7641 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7644 /* Finish SHF_MERGE section merging. */
7647 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7652 if (!is_elf_hash_table (info
->hash
))
7655 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7656 if ((ibfd
->flags
& DYNAMIC
) == 0
7657 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7658 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7659 == get_elf_backend_data (obfd
)->s
->elfclass
))
7660 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7661 if ((sec
->flags
& SEC_MERGE
) != 0
7662 && !bfd_is_abs_section (sec
->output_section
))
7664 struct bfd_elf_section_data
*secdata
;
7666 secdata
= elf_section_data (sec
);
7667 if (! _bfd_add_merge_section (obfd
,
7668 &elf_hash_table (info
)->merge_info
,
7669 sec
, &secdata
->sec_info
))
7671 else if (secdata
->sec_info
)
7672 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7675 if (elf_hash_table (info
)->merge_info
!= NULL
)
7676 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7677 merge_sections_remove_hook
);
7681 /* Create an entry in an ELF linker hash table. */
7683 struct bfd_hash_entry
*
7684 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7685 struct bfd_hash_table
*table
,
7688 /* Allocate the structure if it has not already been allocated by a
7692 entry
= (struct bfd_hash_entry
*)
7693 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7698 /* Call the allocation method of the superclass. */
7699 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7702 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7703 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7705 /* Set local fields. */
7708 ret
->got
= htab
->init_got_refcount
;
7709 ret
->plt
= htab
->init_plt_refcount
;
7710 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7711 - offsetof (struct elf_link_hash_entry
, size
)));
7712 /* Assume that we have been called by a non-ELF symbol reader.
7713 This flag is then reset by the code which reads an ELF input
7714 file. This ensures that a symbol created by a non-ELF symbol
7715 reader will have the flag set correctly. */
7722 /* Copy data from an indirect symbol to its direct symbol, hiding the
7723 old indirect symbol. Also used for copying flags to a weakdef. */
7726 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7727 struct elf_link_hash_entry
*dir
,
7728 struct elf_link_hash_entry
*ind
)
7730 struct elf_link_hash_table
*htab
;
7732 if (ind
->dyn_relocs
!= NULL
)
7734 if (dir
->dyn_relocs
!= NULL
)
7736 struct elf_dyn_relocs
**pp
;
7737 struct elf_dyn_relocs
*p
;
7739 /* Add reloc counts against the indirect sym to the direct sym
7740 list. Merge any entries against the same section. */
7741 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7743 struct elf_dyn_relocs
*q
;
7745 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7746 if (q
->sec
== p
->sec
)
7748 q
->pc_count
+= p
->pc_count
;
7749 q
->count
+= p
->count
;
7756 *pp
= dir
->dyn_relocs
;
7759 dir
->dyn_relocs
= ind
->dyn_relocs
;
7760 ind
->dyn_relocs
= NULL
;
7763 /* Copy down any references that we may have already seen to the
7764 symbol which just became indirect. */
7766 if (dir
->versioned
!= versioned_hidden
)
7767 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7768 dir
->ref_regular
|= ind
->ref_regular
;
7769 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7770 dir
->non_got_ref
|= ind
->non_got_ref
;
7771 dir
->needs_plt
|= ind
->needs_plt
;
7772 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7774 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7777 /* Copy over the global and procedure linkage table refcount entries.
7778 These may have been already set up by a check_relocs routine. */
7779 htab
= elf_hash_table (info
);
7780 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7782 if (dir
->got
.refcount
< 0)
7783 dir
->got
.refcount
= 0;
7784 dir
->got
.refcount
+= ind
->got
.refcount
;
7785 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7788 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7790 if (dir
->plt
.refcount
< 0)
7791 dir
->plt
.refcount
= 0;
7792 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7793 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7796 if (ind
->dynindx
!= -1)
7798 if (dir
->dynindx
!= -1)
7799 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7800 dir
->dynindx
= ind
->dynindx
;
7801 dir
->dynstr_index
= ind
->dynstr_index
;
7803 ind
->dynstr_index
= 0;
7808 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7809 struct elf_link_hash_entry
*h
,
7812 /* STT_GNU_IFUNC symbol must go through PLT. */
7813 if (h
->type
!= STT_GNU_IFUNC
)
7815 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7820 h
->forced_local
= 1;
7821 if (h
->dynindx
!= -1)
7823 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7826 h
->dynstr_index
= 0;
7831 /* Hide a symbol. */
7834 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7835 struct bfd_link_info
*info
,
7836 struct bfd_link_hash_entry
*h
)
7838 if (is_elf_hash_table (info
->hash
))
7840 const struct elf_backend_data
*bed
7841 = get_elf_backend_data (output_bfd
);
7842 struct elf_link_hash_entry
*eh
7843 = (struct elf_link_hash_entry
*) h
;
7844 bed
->elf_backend_hide_symbol (info
, eh
, true);
7845 eh
->def_dynamic
= 0;
7846 eh
->ref_dynamic
= 0;
7847 eh
->dynamic_def
= 0;
7851 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7855 _bfd_elf_link_hash_table_init
7856 (struct elf_link_hash_table
*table
,
7858 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7859 struct bfd_hash_table
*,
7861 unsigned int entsize
,
7862 enum elf_target_id target_id
)
7865 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7867 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7868 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7869 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7870 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7871 /* The first dynamic symbol is a dummy. */
7872 table
->dynsymcount
= 1;
7874 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7876 table
->root
.type
= bfd_link_elf_hash_table
;
7877 table
->hash_table_id
= target_id
;
7878 table
->target_os
= get_elf_backend_data (abfd
)->target_os
;
7883 /* Create an ELF linker hash table. */
7885 struct bfd_link_hash_table
*
7886 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7888 struct elf_link_hash_table
*ret
;
7889 size_t amt
= sizeof (struct elf_link_hash_table
);
7891 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7895 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7896 sizeof (struct elf_link_hash_entry
),
7902 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7907 /* Destroy an ELF linker hash table. */
7910 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7912 struct elf_link_hash_table
*htab
;
7914 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7915 if (htab
->dynstr
!= NULL
)
7916 _bfd_elf_strtab_free (htab
->dynstr
);
7917 _bfd_merge_sections_free (htab
->merge_info
);
7918 _bfd_generic_link_hash_table_free (obfd
);
7921 /* This is a hook for the ELF emulation code in the generic linker to
7922 tell the backend linker what file name to use for the DT_NEEDED
7923 entry for a dynamic object. */
7926 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7928 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7929 && bfd_get_format (abfd
) == bfd_object
)
7930 elf_dt_name (abfd
) = name
;
7934 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7937 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7938 && bfd_get_format (abfd
) == bfd_object
)
7939 lib_class
= elf_dyn_lib_class (abfd
);
7946 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7948 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7949 && bfd_get_format (abfd
) == bfd_object
)
7950 elf_dyn_lib_class (abfd
) = lib_class
;
7953 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7954 the linker ELF emulation code. */
7956 struct bfd_link_needed_list
*
7957 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7958 struct bfd_link_info
*info
)
7960 if (! is_elf_hash_table (info
->hash
))
7962 return elf_hash_table (info
)->needed
;
7965 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7966 hook for the linker ELF emulation code. */
7968 struct bfd_link_needed_list
*
7969 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7970 struct bfd_link_info
*info
)
7972 if (! is_elf_hash_table (info
->hash
))
7974 return elf_hash_table (info
)->runpath
;
7977 /* Get the name actually used for a dynamic object for a link. This
7978 is the SONAME entry if there is one. Otherwise, it is the string
7979 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7982 bfd_elf_get_dt_soname (bfd
*abfd
)
7984 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7985 && bfd_get_format (abfd
) == bfd_object
)
7986 return elf_dt_name (abfd
);
7990 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7991 the ELF linker emulation code. */
7994 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7995 struct bfd_link_needed_list
**pneeded
)
7998 bfd_byte
*dynbuf
= NULL
;
7999 unsigned int elfsec
;
8000 unsigned long shlink
;
8001 bfd_byte
*extdyn
, *extdynend
;
8003 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
8007 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
8008 || bfd_get_format (abfd
) != bfd_object
)
8011 s
= bfd_get_section_by_name (abfd
, ".dynamic");
8012 if (s
== NULL
|| s
->size
== 0)
8015 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
8018 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
8019 if (elfsec
== SHN_BAD
)
8022 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
8024 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
8025 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
8028 extdynend
= extdyn
+ s
->size
;
8029 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
8031 Elf_Internal_Dyn dyn
;
8033 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
8035 if (dyn
.d_tag
== DT_NULL
)
8038 if (dyn
.d_tag
== DT_NEEDED
)
8041 struct bfd_link_needed_list
*l
;
8042 unsigned int tagv
= dyn
.d_un
.d_val
;
8045 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
8050 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
8070 struct elf_symbuf_symbol
8072 unsigned long st_name
; /* Symbol name, index in string tbl */
8073 unsigned char st_info
; /* Type and binding attributes */
8074 unsigned char st_other
; /* Visibilty, and target specific */
8077 struct elf_symbuf_head
8079 struct elf_symbuf_symbol
*ssym
;
8081 unsigned int st_shndx
;
8088 Elf_Internal_Sym
*isym
;
8089 struct elf_symbuf_symbol
*ssym
;
8095 /* Sort references to symbols by ascending section number. */
8098 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8100 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8101 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8103 if (s1
->st_shndx
!= s2
->st_shndx
)
8104 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8105 /* Final sort by the address of the sym in the symbuf ensures
8108 return s1
> s2
? 1 : -1;
8113 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8115 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8116 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8117 int ret
= strcmp (s1
->name
, s2
->name
);
8120 if (s1
->u
.p
!= s2
->u
.p
)
8121 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8125 static struct elf_symbuf_head
*
8126 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8128 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8129 struct elf_symbuf_symbol
*ssym
;
8130 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8131 size_t i
, shndx_count
, total_size
, amt
;
8133 amt
= symcount
* sizeof (*indbuf
);
8134 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8138 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8139 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
8140 *ind
++ = &isymbuf
[i
];
8143 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8144 elf_sort_elf_symbol
);
8147 if (indbufend
> indbuf
)
8148 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8149 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8152 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8153 + (indbufend
- indbuf
) * sizeof (*ssym
));
8154 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8155 if (ssymbuf
== NULL
)
8161 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8162 ssymbuf
->ssym
= NULL
;
8163 ssymbuf
->count
= shndx_count
;
8164 ssymbuf
->st_shndx
= 0;
8165 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8167 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8170 ssymhead
->ssym
= ssym
;
8171 ssymhead
->count
= 0;
8172 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8174 ssym
->st_name
= (*ind
)->st_name
;
8175 ssym
->st_info
= (*ind
)->st_info
;
8176 ssym
->st_other
= (*ind
)->st_other
;
8179 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8180 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
8187 /* Check if 2 sections define the same set of local and global
8191 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8192 struct bfd_link_info
*info
)
8195 const struct elf_backend_data
*bed1
, *bed2
;
8196 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8197 size_t symcount1
, symcount2
;
8198 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8199 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8200 Elf_Internal_Sym
*isym
, *isymend
;
8201 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8202 size_t count1
, count2
, sec_count1
, sec_count2
, i
;
8203 unsigned int shndx1
, shndx2
;
8205 bool ignore_section_symbol_p
;
8210 /* Both sections have to be in ELF. */
8211 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8212 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8215 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8218 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8219 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8220 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8223 bed1
= get_elf_backend_data (bfd1
);
8224 bed2
= get_elf_backend_data (bfd2
);
8225 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8226 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8227 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8228 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8230 if (symcount1
== 0 || symcount2
== 0)
8236 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8237 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8239 /* Ignore section symbols only when matching non-debugging sections
8240 or linkonce section with comdat section. */
8241 ignore_section_symbol_p
8242 = ((sec1
->flags
& SEC_DEBUGGING
) == 0
8243 || ((elf_section_flags (sec1
) & SHF_GROUP
)
8244 != (elf_section_flags (sec2
) & SHF_GROUP
)));
8246 if (ssymbuf1
== NULL
)
8248 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8250 if (isymbuf1
== NULL
)
8253 if (info
!= NULL
&& !info
->reduce_memory_overheads
)
8255 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8256 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8260 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8262 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8264 if (isymbuf2
== NULL
)
8267 if (ssymbuf1
!= NULL
&& info
!= NULL
&& !info
->reduce_memory_overheads
)
8269 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8270 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8274 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8276 /* Optimized faster version. */
8278 struct elf_symbol
*symp
;
8279 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8282 hi
= ssymbuf1
->count
;
8288 mid
= (lo
+ hi
) / 2;
8289 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8291 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8295 count1
= ssymbuf1
[mid
].count
;
8300 if (ignore_section_symbol_p
)
8302 for (i
= 0; i
< count1
; i
++)
8303 if (ELF_ST_TYPE (ssymbuf1
->ssym
[i
].st_info
) == STT_SECTION
)
8305 count1
-= sec_count1
;
8309 hi
= ssymbuf2
->count
;
8315 mid
= (lo
+ hi
) / 2;
8316 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8318 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8322 count2
= ssymbuf2
[mid
].count
;
8327 if (ignore_section_symbol_p
)
8329 for (i
= 0; i
< count2
; i
++)
8330 if (ELF_ST_TYPE (ssymbuf2
->ssym
[i
].st_info
) == STT_SECTION
)
8332 count2
-= sec_count2
;
8335 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8339 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8341 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8342 if (symtable1
== NULL
|| symtable2
== NULL
)
8346 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
+ sec_count1
;
8347 ssym
< ssymend
; ssym
++)
8349 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8351 symp
->u
.ssym
= ssym
;
8352 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8359 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
+ sec_count2
;
8360 ssym
< ssymend
; ssym
++)
8362 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8364 symp
->u
.ssym
= ssym
;
8365 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8371 /* Sort symbol by name. */
8372 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8373 elf_sym_name_compare
);
8374 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8375 elf_sym_name_compare
);
8377 for (i
= 0; i
< count1
; i
++)
8378 /* Two symbols must have the same binding, type and name. */
8379 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8380 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8381 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8388 symtable1
= (struct elf_symbol
*)
8389 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8390 symtable2
= (struct elf_symbol
*)
8391 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8392 if (symtable1
== NULL
|| symtable2
== NULL
)
8395 /* Count definitions in the section. */
8397 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8398 if (isym
->st_shndx
== shndx1
8399 && (!ignore_section_symbol_p
8400 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8401 symtable1
[count1
++].u
.isym
= isym
;
8404 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8405 if (isym
->st_shndx
== shndx2
8406 && (!ignore_section_symbol_p
8407 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8408 symtable2
[count2
++].u
.isym
= isym
;
8410 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8413 for (i
= 0; i
< count1
; i
++)
8415 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8416 symtable1
[i
].u
.isym
->st_name
);
8418 for (i
= 0; i
< count2
; i
++)
8420 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8421 symtable2
[i
].u
.isym
->st_name
);
8423 /* Sort symbol by name. */
8424 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8425 elf_sym_name_compare
);
8426 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8427 elf_sym_name_compare
);
8429 for (i
= 0; i
< count1
; i
++)
8430 /* Two symbols must have the same binding, type and name. */
8431 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8432 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8433 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8447 /* Return TRUE if 2 section types are compatible. */
8450 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8451 bfd
*bbfd
, const asection
*bsec
)
8455 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8456 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8459 return elf_section_type (asec
) == elf_section_type (bsec
);
8462 /* Final phase of ELF linker. */
8464 /* A structure we use to avoid passing large numbers of arguments. */
8466 struct elf_final_link_info
8468 /* General link information. */
8469 struct bfd_link_info
*info
;
8472 /* Symbol string table. */
8473 struct elf_strtab_hash
*symstrtab
;
8474 /* .hash section. */
8476 /* symbol version section (.gnu.version). */
8477 asection
*symver_sec
;
8478 /* Buffer large enough to hold contents of any section. */
8480 /* Buffer large enough to hold external relocs of any section. */
8481 void *external_relocs
;
8482 /* Buffer large enough to hold internal relocs of any section. */
8483 Elf_Internal_Rela
*internal_relocs
;
8484 /* Buffer large enough to hold external local symbols of any input
8486 bfd_byte
*external_syms
;
8487 /* And a buffer for symbol section indices. */
8488 Elf_External_Sym_Shndx
*locsym_shndx
;
8489 /* Buffer large enough to hold internal local symbols of any input
8491 Elf_Internal_Sym
*internal_syms
;
8492 /* Array large enough to hold a symbol index for each local symbol
8493 of any input BFD. */
8495 /* Array large enough to hold a section pointer for each local
8496 symbol of any input BFD. */
8497 asection
**sections
;
8498 /* Buffer for SHT_SYMTAB_SHNDX section. */
8499 Elf_External_Sym_Shndx
*symshndxbuf
;
8500 /* Number of STT_FILE syms seen. */
8501 size_t filesym_count
;
8502 /* Local symbol hash table. */
8503 struct bfd_hash_table local_hash_table
;
8506 struct local_hash_entry
8508 /* Base hash table entry structure. */
8509 struct bfd_hash_entry root
;
8510 /* Size of the local symbol name. */
8512 /* Number of the duplicated local symbol names. */
8516 /* Create an entry in the local symbol hash table. */
8518 static struct bfd_hash_entry
*
8519 local_hash_newfunc (struct bfd_hash_entry
*entry
,
8520 struct bfd_hash_table
*table
,
8524 /* Allocate the structure if it has not already been allocated by a
8528 entry
= bfd_hash_allocate (table
,
8529 sizeof (struct local_hash_entry
));
8534 /* Call the allocation method of the superclass. */
8535 entry
= bfd_hash_newfunc (entry
, table
, string
);
8538 ((struct local_hash_entry
*) entry
)->count
= 0;
8539 ((struct local_hash_entry
*) entry
)->size
= 0;
8545 /* This struct is used to pass information to elf_link_output_extsym. */
8547 struct elf_outext_info
8552 struct elf_final_link_info
*flinfo
;
8556 /* Support for evaluating a complex relocation.
8558 Complex relocations are generalized, self-describing relocations. The
8559 implementation of them consists of two parts: complex symbols, and the
8560 relocations themselves.
8562 The relocations use a reserved elf-wide relocation type code (R_RELC
8563 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8564 information (start bit, end bit, word width, etc) into the addend. This
8565 information is extracted from CGEN-generated operand tables within gas.
8567 Complex symbols are mangled symbols (STT_RELC external / BSF_RELC
8568 internal) representing prefix-notation expressions, including but not
8569 limited to those sorts of expressions normally encoded as addends in the
8570 addend field. The symbol mangling format is:
8573 | <unary-operator> ':' <node>
8574 | <binary-operator> ':' <node> ':' <node>
8577 <literal> := 's' <digits=N> ':' <N character symbol name>
8578 | 'S' <digits=N> ':' <N character section name>
8582 <binary-operator> := as in C
8583 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8586 set_symbol_value (bfd
*bfd_with_globals
,
8587 Elf_Internal_Sym
*isymbuf
,
8592 struct elf_link_hash_entry
**sym_hashes
;
8593 struct elf_link_hash_entry
*h
;
8594 size_t extsymoff
= locsymcount
;
8596 if (symidx
< locsymcount
)
8598 Elf_Internal_Sym
*sym
;
8600 sym
= isymbuf
+ symidx
;
8601 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8603 /* It is a local symbol: move it to the
8604 "absolute" section and give it a value. */
8605 sym
->st_shndx
= SHN_ABS
;
8606 sym
->st_value
= val
;
8609 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8613 /* It is a global symbol: set its link type
8614 to "defined" and give it a value. */
8616 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8617 h
= sym_hashes
[symidx
- extsymoff
];
8618 while (h
->root
.type
== bfd_link_hash_indirect
8619 || h
->root
.type
== bfd_link_hash_warning
)
8620 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8621 h
->root
.type
= bfd_link_hash_defined
;
8622 h
->root
.u
.def
.value
= val
;
8623 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8627 resolve_symbol (const char *name
,
8629 struct elf_final_link_info
*flinfo
,
8631 Elf_Internal_Sym
*isymbuf
,
8634 Elf_Internal_Sym
*sym
;
8635 struct bfd_link_hash_entry
*global_entry
;
8636 const char *candidate
= NULL
;
8637 Elf_Internal_Shdr
*symtab_hdr
;
8640 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8642 for (i
= 0; i
< locsymcount
; ++ i
)
8646 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8649 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8650 symtab_hdr
->sh_link
,
8653 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8654 name
, candidate
, (unsigned long) sym
->st_value
);
8656 if (candidate
&& strcmp (candidate
, name
) == 0)
8658 asection
*sec
= flinfo
->sections
[i
];
8660 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8661 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8663 printf ("Found symbol with value %8.8lx\n",
8664 (unsigned long) *result
);
8670 /* Hmm, haven't found it yet. perhaps it is a global. */
8671 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8672 false, false, true);
8676 if (global_entry
->type
== bfd_link_hash_defined
8677 || global_entry
->type
== bfd_link_hash_defweak
)
8679 *result
= (global_entry
->u
.def
.value
8680 + global_entry
->u
.def
.section
->output_section
->vma
8681 + global_entry
->u
.def
.section
->output_offset
);
8683 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8684 global_entry
->root
.string
, (unsigned long) *result
);
8692 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8693 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8694 names like "foo.end" which is the end address of section "foo". */
8697 resolve_section (const char *name
,
8705 for (curr
= sections
; curr
; curr
= curr
->next
)
8706 if (strcmp (curr
->name
, name
) == 0)
8708 *result
= curr
->vma
;
8712 /* Hmm. still haven't found it. try pseudo-section names. */
8713 /* FIXME: This could be coded more efficiently... */
8714 for (curr
= sections
; curr
; curr
= curr
->next
)
8716 len
= strlen (curr
->name
);
8717 if (len
> strlen (name
))
8720 if (strncmp (curr
->name
, name
, len
) == 0)
8722 if (startswith (name
+ len
, ".end"))
8724 *result
= (curr
->vma
8725 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8729 /* Insert more pseudo-section names here, if you like. */
8737 undefined_reference (const char *reftype
, const char *name
)
8739 /* xgettext:c-format */
8740 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8742 bfd_set_error (bfd_error_bad_value
);
8746 eval_symbol (bfd_vma
*result
,
8749 struct elf_final_link_info
*flinfo
,
8751 Elf_Internal_Sym
*isymbuf
,
8760 const char *sym
= *symp
;
8762 bool symbol_is_section
= false;
8767 if (len
< 1 || len
> sizeof (symbuf
))
8769 bfd_set_error (bfd_error_invalid_operation
);
8782 *result
= strtoul (sym
, (char **) symp
, 16);
8786 symbol_is_section
= true;
8790 symlen
= strtol (sym
, (char **) symp
, 10);
8791 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8793 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8795 bfd_set_error (bfd_error_invalid_operation
);
8799 memcpy (symbuf
, sym
, symlen
);
8800 symbuf
[symlen
] = '\0';
8801 *symp
= sym
+ symlen
;
8803 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8804 the symbol as a section, or vice-versa. so we're pretty liberal in our
8805 interpretation here; section means "try section first", not "must be a
8806 section", and likewise with symbol. */
8808 if (symbol_is_section
)
8810 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8811 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8812 isymbuf
, locsymcount
))
8814 undefined_reference ("section", symbuf
);
8820 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8821 isymbuf
, locsymcount
)
8822 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8825 undefined_reference ("symbol", symbuf
);
8832 /* All that remains are operators. */
8834 #define UNARY_OP(op) \
8835 if (startswith (sym, #op)) \
8837 sym += strlen (#op); \
8841 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8842 isymbuf, locsymcount, signed_p)) \
8845 *result = op ((bfd_signed_vma) a); \
8851 #define BINARY_OP_HEAD(op) \
8852 if (startswith (sym, #op)) \
8854 sym += strlen (#op); \
8858 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8859 isymbuf, locsymcount, signed_p)) \
8862 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8863 isymbuf, locsymcount, signed_p)) \
8865 #define BINARY_OP_TAIL(op) \
8867 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8872 #define BINARY_OP(op) BINARY_OP_HEAD(op) BINARY_OP_TAIL(op)
8876 BINARY_OP_HEAD (<<);
8877 if (b
>= sizeof (a
) * CHAR_BIT
)
8883 BINARY_OP_TAIL (<<);
8884 BINARY_OP_HEAD (>>);
8885 if (b
>= sizeof (a
) * CHAR_BIT
)
8887 *result
= signed_p
&& (bfd_signed_vma
) a
< 0 ? -1 : 0;
8890 BINARY_OP_TAIL (>>);
8903 _bfd_error_handler (_("division by zero"));
8904 bfd_set_error (bfd_error_bad_value
);
8911 _bfd_error_handler (_("division by zero"));
8912 bfd_set_error (bfd_error_bad_value
);
8925 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8926 bfd_set_error (bfd_error_invalid_operation
);
8932 put_value (bfd_vma size
,
8933 unsigned long chunksz
,
8938 location
+= (size
- chunksz
);
8940 for (; size
; size
-= chunksz
, location
-= chunksz
)
8945 bfd_put_8 (input_bfd
, x
, location
);
8949 bfd_put_16 (input_bfd
, x
, location
);
8953 bfd_put_32 (input_bfd
, x
, location
);
8954 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8960 bfd_put_64 (input_bfd
, x
, location
);
8961 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8974 get_value (bfd_vma size
,
8975 unsigned long chunksz
,
8982 /* Sanity checks. */
8983 BFD_ASSERT (chunksz
<= sizeof (x
)
8986 && (size
% chunksz
) == 0
8987 && input_bfd
!= NULL
8988 && location
!= NULL
);
8990 if (chunksz
== sizeof (x
))
8992 BFD_ASSERT (size
== chunksz
);
8994 /* Make sure that we do not perform an undefined shift operation.
8995 We know that size == chunksz so there will only be one iteration
8996 of the loop below. */
9000 shift
= 8 * chunksz
;
9002 for (; size
; size
-= chunksz
, location
+= chunksz
)
9007 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
9010 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
9013 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
9017 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
9028 decode_complex_addend (unsigned long *start
, /* in bits */
9029 unsigned long *oplen
, /* in bits */
9030 unsigned long *len
, /* in bits */
9031 unsigned long *wordsz
, /* in bytes */
9032 unsigned long *chunksz
, /* in bytes */
9033 unsigned long *lsb0_p
,
9034 unsigned long *signed_p
,
9035 unsigned long *trunc_p
,
9036 unsigned long encoded
)
9038 * start
= encoded
& 0x3F;
9039 * len
= (encoded
>> 6) & 0x3F;
9040 * oplen
= (encoded
>> 12) & 0x3F;
9041 * wordsz
= (encoded
>> 18) & 0xF;
9042 * chunksz
= (encoded
>> 22) & 0xF;
9043 * lsb0_p
= (encoded
>> 27) & 1;
9044 * signed_p
= (encoded
>> 28) & 1;
9045 * trunc_p
= (encoded
>> 29) & 1;
9048 bfd_reloc_status_type
9049 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
9050 asection
*input_section
,
9052 Elf_Internal_Rela
*rel
,
9055 bfd_vma shift
, x
, mask
;
9056 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
9057 bfd_reloc_status_type r
;
9058 bfd_size_type octets
;
9060 /* Perform this reloc, since it is complex.
9061 (this is not to say that it necessarily refers to a complex
9062 symbol; merely that it is a self-describing CGEN based reloc.
9063 i.e. the addend has the complete reloc information (bit start, end,
9064 word size, etc) encoded within it.). */
9066 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
9067 &chunksz
, &lsb0_p
, &signed_p
,
9068 &trunc_p
, rel
->r_addend
);
9070 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
9073 shift
= (start
+ 1) - len
;
9075 shift
= (8 * wordsz
) - (start
+ len
);
9077 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
9078 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
9081 printf ("Doing complex reloc: "
9082 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
9083 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
9084 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
9085 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
9086 oplen
, (unsigned long) x
, (unsigned long) mask
,
9087 (unsigned long) relocation
);
9092 /* Now do an overflow check. */
9093 r
= bfd_check_overflow ((signed_p
9094 ? complain_overflow_signed
9095 : complain_overflow_unsigned
),
9096 len
, 0, (8 * wordsz
),
9100 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
9103 printf (" relocation: %8.8lx\n"
9104 " shifted mask: %8.8lx\n"
9105 " shifted/masked reloc: %8.8lx\n"
9106 " result: %8.8lx\n",
9107 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
9108 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
9110 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
9114 /* Functions to read r_offset from external (target order) reloc
9115 entry. Faster than bfd_getl32 et al, because we let the compiler
9116 know the value is aligned. */
9119 ext32l_r_offset (const void *p
)
9126 const union aligned32
*a
9127 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9129 uint32_t aval
= ( (uint32_t) a
->c
[0]
9130 | (uint32_t) a
->c
[1] << 8
9131 | (uint32_t) a
->c
[2] << 16
9132 | (uint32_t) a
->c
[3] << 24);
9137 ext32b_r_offset (const void *p
)
9144 const union aligned32
*a
9145 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9147 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
9148 | (uint32_t) a
->c
[1] << 16
9149 | (uint32_t) a
->c
[2] << 8
9150 | (uint32_t) a
->c
[3]);
9154 #ifdef BFD_HOST_64_BIT
9156 ext64l_r_offset (const void *p
)
9163 const union aligned64
*a
9164 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9166 uint64_t aval
= ( (uint64_t) a
->c
[0]
9167 | (uint64_t) a
->c
[1] << 8
9168 | (uint64_t) a
->c
[2] << 16
9169 | (uint64_t) a
->c
[3] << 24
9170 | (uint64_t) a
->c
[4] << 32
9171 | (uint64_t) a
->c
[5] << 40
9172 | (uint64_t) a
->c
[6] << 48
9173 | (uint64_t) a
->c
[7] << 56);
9178 ext64b_r_offset (const void *p
)
9185 const union aligned64
*a
9186 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9188 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9189 | (uint64_t) a
->c
[1] << 48
9190 | (uint64_t) a
->c
[2] << 40
9191 | (uint64_t) a
->c
[3] << 32
9192 | (uint64_t) a
->c
[4] << 24
9193 | (uint64_t) a
->c
[5] << 16
9194 | (uint64_t) a
->c
[6] << 8
9195 | (uint64_t) a
->c
[7]);
9200 /* When performing a relocatable link, the input relocations are
9201 preserved. But, if they reference global symbols, the indices
9202 referenced must be updated. Update all the relocations found in
9206 elf_link_adjust_relocs (bfd
*abfd
,
9208 struct bfd_elf_section_reloc_data
*reldata
,
9210 struct bfd_link_info
*info
)
9213 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9215 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9216 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9217 bfd_vma r_type_mask
;
9219 unsigned int count
= reldata
->count
;
9220 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9222 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9224 swap_in
= bed
->s
->swap_reloc_in
;
9225 swap_out
= bed
->s
->swap_reloc_out
;
9227 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9229 swap_in
= bed
->s
->swap_reloca_in
;
9230 swap_out
= bed
->s
->swap_reloca_out
;
9235 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9238 if (bed
->s
->arch_size
== 32)
9245 r_type_mask
= 0xffffffff;
9249 erela
= reldata
->hdr
->contents
;
9250 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9252 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9255 if (*rel_hash
== NULL
)
9258 if ((*rel_hash
)->indx
== -2
9259 && info
->gc_sections
9260 && ! info
->gc_keep_exported
)
9262 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9263 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9265 (*rel_hash
)->root
.root
.string
);
9266 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9268 bfd_set_error (bfd_error_invalid_operation
);
9271 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9273 (*swap_in
) (abfd
, erela
, irela
);
9274 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9275 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9276 | (irela
[j
].r_info
& r_type_mask
));
9277 (*swap_out
) (abfd
, irela
, erela
);
9280 if (bed
->elf_backend_update_relocs
)
9281 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9283 if (sort
&& count
!= 0)
9285 bfd_vma (*ext_r_off
) (const void *);
9288 bfd_byte
*base
, *end
, *p
, *loc
;
9289 bfd_byte
*buf
= NULL
;
9291 if (bed
->s
->arch_size
== 32)
9293 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9294 ext_r_off
= ext32l_r_offset
;
9295 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9296 ext_r_off
= ext32b_r_offset
;
9302 #ifdef BFD_HOST_64_BIT
9303 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9304 ext_r_off
= ext64l_r_offset
;
9305 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9306 ext_r_off
= ext64b_r_offset
;
9312 /* Must use a stable sort here. A modified insertion sort,
9313 since the relocs are mostly sorted already. */
9314 elt_size
= reldata
->hdr
->sh_entsize
;
9315 base
= reldata
->hdr
->contents
;
9316 end
= base
+ count
* elt_size
;
9317 if (elt_size
> sizeof (Elf64_External_Rela
))
9320 /* Ensure the first element is lowest. This acts as a sentinel,
9321 speeding the main loop below. */
9322 r_off
= (*ext_r_off
) (base
);
9323 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9325 bfd_vma r_off2
= (*ext_r_off
) (p
);
9334 /* Don't just swap *base and *loc as that changes the order
9335 of the original base[0] and base[1] if they happen to
9336 have the same r_offset. */
9337 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9338 memcpy (onebuf
, loc
, elt_size
);
9339 memmove (base
+ elt_size
, base
, loc
- base
);
9340 memcpy (base
, onebuf
, elt_size
);
9343 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9345 /* base to p is sorted, *p is next to insert. */
9346 r_off
= (*ext_r_off
) (p
);
9347 /* Search the sorted region for location to insert. */
9349 while (r_off
< (*ext_r_off
) (loc
))
9354 /* Chances are there is a run of relocs to insert here,
9355 from one of more input files. Files are not always
9356 linked in order due to the way elf_link_input_bfd is
9357 called. See pr17666. */
9358 size_t sortlen
= p
- loc
;
9359 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9360 size_t runlen
= elt_size
;
9361 size_t buf_size
= 96 * 1024;
9362 while (p
+ runlen
< end
9363 && (sortlen
<= buf_size
9364 || runlen
+ elt_size
<= buf_size
)
9365 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9369 buf
= bfd_malloc (buf_size
);
9373 if (runlen
< sortlen
)
9375 memcpy (buf
, p
, runlen
);
9376 memmove (loc
+ runlen
, loc
, sortlen
);
9377 memcpy (loc
, buf
, runlen
);
9381 memcpy (buf
, loc
, sortlen
);
9382 memmove (loc
, p
, runlen
);
9383 memcpy (loc
+ runlen
, buf
, sortlen
);
9385 p
+= runlen
- elt_size
;
9388 /* Hashes are no longer valid. */
9389 free (reldata
->hashes
);
9390 reldata
->hashes
= NULL
;
9396 struct elf_link_sort_rela
9402 enum elf_reloc_type_class type
;
9403 /* We use this as an array of size int_rels_per_ext_rel. */
9404 Elf_Internal_Rela rela
[1];
9407 /* qsort stability here and for cmp2 is only an issue if multiple
9408 dynamic relocations are emitted at the same address. But targets
9409 that apply a series of dynamic relocations each operating on the
9410 result of the prior relocation can't use -z combreloc as
9411 implemented anyway. Such schemes tend to be broken by sorting on
9412 symbol index. That leaves dynamic NONE relocs as the only other
9413 case where ld might emit multiple relocs at the same address, and
9414 those are only emitted due to target bugs. */
9417 elf_link_sort_cmp1 (const void *A
, const void *B
)
9419 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9420 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9421 int relativea
, relativeb
;
9423 relativea
= a
->type
== reloc_class_relative
;
9424 relativeb
= b
->type
== reloc_class_relative
;
9426 if (relativea
< relativeb
)
9428 if (relativea
> relativeb
)
9430 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9432 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9434 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9436 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9442 elf_link_sort_cmp2 (const void *A
, const void *B
)
9444 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9445 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9447 if (a
->type
< b
->type
)
9449 if (a
->type
> b
->type
)
9451 if (a
->u
.offset
< b
->u
.offset
)
9453 if (a
->u
.offset
> b
->u
.offset
)
9455 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9457 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9463 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9465 asection
*dynamic_relocs
;
9468 bfd_size_type count
, size
;
9469 size_t i
, ret
, sort_elt
, ext_size
;
9470 bfd_byte
*sort
, *s_non_relative
, *p
;
9471 struct elf_link_sort_rela
*sq
;
9472 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9473 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9474 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9475 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9476 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9477 struct bfd_link_order
*lo
;
9481 /* Find a dynamic reloc section. */
9482 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9483 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9484 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9485 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9487 bool use_rela_initialised
= false;
9489 /* This is just here to stop gcc from complaining.
9490 Its initialization checking code is not perfect. */
9493 /* Both sections are present. Examine the sizes
9494 of the indirect sections to help us choose. */
9495 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9496 if (lo
->type
== bfd_indirect_link_order
)
9498 asection
*o
= lo
->u
.indirect
.section
;
9500 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9502 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9503 /* Section size is divisible by both rel and rela sizes.
9504 It is of no help to us. */
9508 /* Section size is only divisible by rela. */
9509 if (use_rela_initialised
&& !use_rela
)
9511 _bfd_error_handler (_("%pB: unable to sort relocs - "
9512 "they are in more than one size"),
9514 bfd_set_error (bfd_error_invalid_operation
);
9520 use_rela_initialised
= true;
9524 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9526 /* Section size is only divisible by rel. */
9527 if (use_rela_initialised
&& use_rela
)
9529 _bfd_error_handler (_("%pB: unable to sort relocs - "
9530 "they are in more than one size"),
9532 bfd_set_error (bfd_error_invalid_operation
);
9538 use_rela_initialised
= true;
9543 /* The section size is not divisible by either -
9544 something is wrong. */
9545 _bfd_error_handler (_("%pB: unable to sort relocs - "
9546 "they are of an unknown size"), abfd
);
9547 bfd_set_error (bfd_error_invalid_operation
);
9552 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9553 if (lo
->type
== bfd_indirect_link_order
)
9555 asection
*o
= lo
->u
.indirect
.section
;
9557 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9559 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9560 /* Section size is divisible by both rel and rela sizes.
9561 It is of no help to us. */
9565 /* Section size is only divisible by rela. */
9566 if (use_rela_initialised
&& !use_rela
)
9568 _bfd_error_handler (_("%pB: unable to sort relocs - "
9569 "they are in more than one size"),
9571 bfd_set_error (bfd_error_invalid_operation
);
9577 use_rela_initialised
= true;
9581 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9583 /* Section size is only divisible by rel. */
9584 if (use_rela_initialised
&& use_rela
)
9586 _bfd_error_handler (_("%pB: unable to sort relocs - "
9587 "they are in more than one size"),
9589 bfd_set_error (bfd_error_invalid_operation
);
9595 use_rela_initialised
= true;
9600 /* The section size is not divisible by either -
9601 something is wrong. */
9602 _bfd_error_handler (_("%pB: unable to sort relocs - "
9603 "they are of an unknown size"), abfd
);
9604 bfd_set_error (bfd_error_invalid_operation
);
9609 if (! use_rela_initialised
)
9613 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9615 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9622 dynamic_relocs
= rela_dyn
;
9623 ext_size
= bed
->s
->sizeof_rela
;
9624 swap_in
= bed
->s
->swap_reloca_in
;
9625 swap_out
= bed
->s
->swap_reloca_out
;
9629 dynamic_relocs
= rel_dyn
;
9630 ext_size
= bed
->s
->sizeof_rel
;
9631 swap_in
= bed
->s
->swap_reloc_in
;
9632 swap_out
= bed
->s
->swap_reloc_out
;
9636 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9637 if (lo
->type
== bfd_indirect_link_order
)
9638 size
+= lo
->u
.indirect
.section
->size
;
9640 if (size
!= dynamic_relocs
->size
)
9643 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9644 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9646 count
= dynamic_relocs
->size
/ ext_size
;
9649 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9653 (*info
->callbacks
->warning
)
9654 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9658 if (bed
->s
->arch_size
== 32)
9659 r_sym_mask
= ~(bfd_vma
) 0xff;
9661 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9663 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9664 if (lo
->type
== bfd_indirect_link_order
)
9666 bfd_byte
*erel
, *erelend
;
9667 asection
*o
= lo
->u
.indirect
.section
;
9669 if (o
->contents
== NULL
&& o
->size
!= 0)
9671 /* This is a reloc section that is being handled as a normal
9672 section. See bfd_section_from_shdr. We can't combine
9673 relocs in this case. */
9678 erelend
= o
->contents
+ o
->size
;
9679 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9681 while (erel
< erelend
)
9683 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9685 (*swap_in
) (abfd
, erel
, s
->rela
);
9686 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9687 s
->u
.sym_mask
= r_sym_mask
;
9693 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9695 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9697 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9698 if (s
->type
!= reloc_class_relative
)
9704 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9705 for (; i
< count
; i
++, p
+= sort_elt
)
9707 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9708 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9710 sp
->u
.offset
= sq
->rela
->r_offset
;
9713 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9715 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9716 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9718 /* We have plt relocs in .rela.dyn. */
9719 sq
= (struct elf_link_sort_rela
*) sort
;
9720 for (i
= 0; i
< count
; i
++)
9721 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9723 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9725 struct bfd_link_order
**plo
;
9726 /* Put srelplt link_order last. This is so the output_offset
9727 set in the next loop is correct for DT_JMPREL. */
9728 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9729 if ((*plo
)->type
== bfd_indirect_link_order
9730 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9736 plo
= &(*plo
)->next
;
9739 dynamic_relocs
->map_tail
.link_order
= lo
;
9744 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9745 if (lo
->type
== bfd_indirect_link_order
)
9747 bfd_byte
*erel
, *erelend
;
9748 asection
*o
= lo
->u
.indirect
.section
;
9751 erelend
= o
->contents
+ o
->size
;
9752 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9753 while (erel
< erelend
)
9755 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9756 (*swap_out
) (abfd
, s
->rela
, erel
);
9763 *psec
= dynamic_relocs
;
9767 /* Add a symbol to the output symbol string table. */
9770 elf_link_output_symstrtab (void *finf
,
9772 Elf_Internal_Sym
*elfsym
,
9773 asection
*input_sec
,
9774 struct elf_link_hash_entry
*h
)
9776 struct elf_final_link_info
*flinfo
= finf
;
9777 int (*output_symbol_hook
)
9778 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9779 struct elf_link_hash_entry
*);
9780 struct elf_link_hash_table
*hash_table
;
9781 const struct elf_backend_data
*bed
;
9782 bfd_size_type strtabsize
;
9784 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9786 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9787 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9788 if (output_symbol_hook
!= NULL
)
9790 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9795 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9796 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9797 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9798 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9802 || (input_sec
->flags
& SEC_EXCLUDE
))
9803 elfsym
->st_name
= (unsigned long) -1;
9806 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9807 to get the final offset for st_name. */
9808 char *versioned_name
= (char *) name
;
9811 if (h
->versioned
== versioned
&& h
->def_dynamic
)
9813 /* Keep only one '@' for versioned symbols defined in
9815 char *version
= strrchr (name
, ELF_VER_CHR
);
9816 char *base_end
= strchr (name
, ELF_VER_CHR
);
9817 if (version
!= base_end
)
9820 size_t len
= strlen (name
);
9821 versioned_name
= bfd_alloc (flinfo
->output_bfd
, len
);
9822 if (versioned_name
== NULL
)
9824 base_len
= base_end
- name
;
9825 memcpy (versioned_name
, name
, base_len
);
9826 memcpy (versioned_name
+ base_len
, version
,
9831 else if (flinfo
->info
->unique_symbol
9832 && ELF_ST_BIND (elfsym
->st_info
) == STB_LOCAL
)
9834 struct local_hash_entry
*lh
;
9838 switch (ELF_ST_TYPE (elfsym
->st_info
))
9844 lh
= (struct local_hash_entry
*) bfd_hash_lookup
9845 (&flinfo
->local_hash_table
, name
, true, false);
9848 /* Always append ".COUNT" to local symbols to avoid
9849 potential conflicts with local symbol "XXX.COUNT". */
9850 sprintf (buf
, "%lx", lh
->count
);
9851 base_len
= lh
->size
;
9854 base_len
= strlen (name
);
9855 lh
->size
= base_len
;
9857 count_len
= strlen (buf
);
9858 versioned_name
= bfd_alloc (flinfo
->output_bfd
,
9859 base_len
+ count_len
+ 2);
9860 if (versioned_name
== NULL
)
9862 memcpy (versioned_name
, name
, base_len
);
9863 versioned_name
[base_len
] = '.';
9864 memcpy (versioned_name
+ base_len
+ 1, buf
,
9871 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9872 versioned_name
, false);
9873 if (elfsym
->st_name
== (unsigned long) -1)
9877 hash_table
= elf_hash_table (flinfo
->info
);
9878 strtabsize
= hash_table
->strtabsize
;
9879 if (strtabsize
<= hash_table
->strtabcount
)
9881 strtabsize
+= strtabsize
;
9882 hash_table
->strtabsize
= strtabsize
;
9883 strtabsize
*= sizeof (*hash_table
->strtab
);
9885 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9887 if (hash_table
->strtab
== NULL
)
9890 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9891 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9892 = hash_table
->strtabcount
;
9893 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9894 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9896 flinfo
->output_bfd
->symcount
+= 1;
9897 hash_table
->strtabcount
+= 1;
9902 /* Swap symbols out to the symbol table and flush the output symbols to
9906 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9908 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9911 const struct elf_backend_data
*bed
;
9913 Elf_Internal_Shdr
*hdr
;
9917 if (!hash_table
->strtabcount
)
9920 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9922 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9924 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9925 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9929 if (flinfo
->symshndxbuf
)
9931 amt
= sizeof (Elf_External_Sym_Shndx
);
9932 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9933 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9934 if (flinfo
->symshndxbuf
== NULL
)
9941 /* Now swap out the symbols. */
9942 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9944 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9945 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9946 elfsym
->sym
.st_name
= 0;
9949 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9950 elfsym
->sym
.st_name
);
9952 /* Inform the linker of the addition of this symbol. */
9954 if (flinfo
->info
->callbacks
->ctf_new_symbol
)
9955 flinfo
->info
->callbacks
->ctf_new_symbol (elfsym
->dest_index
,
9958 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9959 ((bfd_byte
*) symbuf
9960 + (elfsym
->dest_index
9961 * bed
->s
->sizeof_sym
)),
9962 (flinfo
->symshndxbuf
9963 + elfsym
->destshndx_index
));
9966 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9967 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9968 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9969 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9970 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9972 hdr
->sh_size
+= amt
;
9980 free (hash_table
->strtab
);
9981 hash_table
->strtab
= NULL
;
9986 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9989 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9991 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9992 && sym
->st_shndx
< SHN_LORESERVE
)
9994 /* The gABI doesn't support dynamic symbols in output sections
9997 /* xgettext:c-format */
9998 (_("%pB: too many sections: %d (>= %d)"),
9999 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
10000 bfd_set_error (bfd_error_nonrepresentable_section
);
10006 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
10007 allowing an unsatisfied unversioned symbol in the DSO to match a
10008 versioned symbol that would normally require an explicit version.
10009 We also handle the case that a DSO references a hidden symbol
10010 which may be satisfied by a versioned symbol in another DSO. */
10013 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
10014 const struct elf_backend_data
*bed
,
10015 struct elf_link_hash_entry
*h
)
10018 struct elf_link_loaded_list
*loaded
;
10020 if (!is_elf_hash_table (info
->hash
))
10023 /* Check indirect symbol. */
10024 while (h
->root
.type
== bfd_link_hash_indirect
)
10025 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10027 switch (h
->root
.type
)
10033 case bfd_link_hash_undefined
:
10034 case bfd_link_hash_undefweak
:
10035 abfd
= h
->root
.u
.undef
.abfd
;
10037 || (abfd
->flags
& DYNAMIC
) == 0
10038 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
10042 case bfd_link_hash_defined
:
10043 case bfd_link_hash_defweak
:
10044 abfd
= h
->root
.u
.def
.section
->owner
;
10047 case bfd_link_hash_common
:
10048 abfd
= h
->root
.u
.c
.p
->section
->owner
;
10051 BFD_ASSERT (abfd
!= NULL
);
10053 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
10055 loaded
= loaded
->next
)
10058 Elf_Internal_Shdr
*hdr
;
10060 size_t extsymcount
;
10062 Elf_Internal_Shdr
*versymhdr
;
10063 Elf_Internal_Sym
*isym
;
10064 Elf_Internal_Sym
*isymend
;
10065 Elf_Internal_Sym
*isymbuf
;
10066 Elf_External_Versym
*ever
;
10067 Elf_External_Versym
*extversym
;
10069 input
= loaded
->abfd
;
10071 /* We check each DSO for a possible hidden versioned definition. */
10073 || elf_dynversym (input
) == 0)
10076 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
10078 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10079 if (elf_bad_symtab (input
))
10081 extsymcount
= symcount
;
10086 extsymcount
= symcount
- hdr
->sh_info
;
10087 extsymoff
= hdr
->sh_info
;
10090 if (extsymcount
== 0)
10093 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
10095 if (isymbuf
== NULL
)
10098 /* Read in any version definitions. */
10099 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
10100 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
10101 || (extversym
= (Elf_External_Versym
*)
10102 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
10103 versymhdr
->sh_size
)) == NULL
)
10109 ever
= extversym
+ extsymoff
;
10110 isymend
= isymbuf
+ extsymcount
;
10111 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
10114 Elf_Internal_Versym iver
;
10115 unsigned short version_index
;
10117 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
10118 || isym
->st_shndx
== SHN_UNDEF
)
10121 name
= bfd_elf_string_from_elf_section (input
,
10124 if (strcmp (name
, h
->root
.root
.string
) != 0)
10127 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
10129 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
10130 && !(h
->def_regular
10131 && h
->forced_local
))
10133 /* If we have a non-hidden versioned sym, then it should
10134 have provided a definition for the undefined sym unless
10135 it is defined in a non-shared object and forced local.
10140 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
10141 if (version_index
== 1 || version_index
== 2)
10143 /* This is the base or first version. We can use it. */
10157 /* Convert ELF common symbol TYPE. */
10160 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
10162 /* Commom symbol can only appear in relocatable link. */
10163 if (!bfd_link_relocatable (info
))
10165 switch (info
->elf_stt_common
)
10169 case elf_stt_common
:
10172 case no_elf_stt_common
:
10179 /* Add an external symbol to the symbol table. This is called from
10180 the hash table traversal routine. When generating a shared object,
10181 we go through the symbol table twice. The first time we output
10182 anything that might have been forced to local scope in a version
10183 script. The second time we output the symbols that are still
10187 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
10189 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
10190 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
10191 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
10193 Elf_Internal_Sym sym
;
10194 asection
*input_sec
;
10195 const struct elf_backend_data
*bed
;
10200 if (h
->root
.type
== bfd_link_hash_warning
)
10202 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10203 if (h
->root
.type
== bfd_link_hash_new
)
10207 /* Decide whether to output this symbol in this pass. */
10208 if (eoinfo
->localsyms
)
10210 if (!h
->forced_local
)
10215 if (h
->forced_local
)
10219 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10221 if (h
->root
.type
== bfd_link_hash_undefined
)
10223 /* If we have an undefined symbol reference here then it must have
10224 come from a shared library that is being linked in. (Undefined
10225 references in regular files have already been handled unless
10226 they are in unreferenced sections which are removed by garbage
10228 bool ignore_undef
= false;
10230 /* Some symbols may be special in that the fact that they're
10231 undefined can be safely ignored - let backend determine that. */
10232 if (bed
->elf_backend_ignore_undef_symbol
)
10233 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
10235 /* If we are reporting errors for this situation then do so now. */
10237 && h
->ref_dynamic_nonweak
10238 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
10239 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10240 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10242 flinfo
->info
->callbacks
->undefined_symbol
10243 (flinfo
->info
, h
->root
.root
.string
,
10244 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10245 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10246 && !flinfo
->info
->warn_unresolved_syms
);
10249 /* Strip a global symbol defined in a discarded section. */
10254 /* We should also warn if a forced local symbol is referenced from
10255 shared libraries. */
10256 if (bfd_link_executable (flinfo
->info
)
10261 && h
->ref_dynamic_nonweak
10262 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10266 struct elf_link_hash_entry
*hi
= h
;
10268 /* Check indirect symbol. */
10269 while (hi
->root
.type
== bfd_link_hash_indirect
)
10270 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10272 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10273 /* xgettext:c-format */
10274 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10275 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10276 /* xgettext:c-format */
10277 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10279 /* xgettext:c-format */
10280 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10281 def_bfd
= flinfo
->output_bfd
;
10282 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10283 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10284 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10285 h
->root
.root
.string
, def_bfd
);
10286 bfd_set_error (bfd_error_bad_value
);
10287 eoinfo
->failed
= true;
10291 /* We don't want to output symbols that have never been mentioned by
10292 a regular file, or that we have been told to strip. However, if
10293 h->indx is set to -2, the symbol is used by a reloc and we must
10298 else if ((h
->def_dynamic
10300 || h
->root
.type
== bfd_link_hash_new
)
10302 && !h
->ref_regular
)
10304 else if (flinfo
->info
->strip
== strip_all
)
10306 else if (flinfo
->info
->strip
== strip_some
10307 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10308 h
->root
.root
.string
, false, false) == NULL
)
10310 else if ((h
->root
.type
== bfd_link_hash_defined
10311 || h
->root
.type
== bfd_link_hash_defweak
)
10312 && ((flinfo
->info
->strip_discarded
10313 && discarded_section (h
->root
.u
.def
.section
))
10314 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10315 && h
->root
.u
.def
.section
->owner
!= NULL
10316 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10318 else if ((h
->root
.type
== bfd_link_hash_undefined
10319 || h
->root
.type
== bfd_link_hash_undefweak
)
10320 && h
->root
.u
.undef
.abfd
!= NULL
10321 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10326 /* If we're stripping it, and it's not a dynamic symbol, there's
10327 nothing else to do. However, if it is a forced local symbol or
10328 an ifunc symbol we need to give the backend finish_dynamic_symbol
10329 function a chance to make it dynamic. */
10331 && h
->dynindx
== -1
10332 && type
!= STT_GNU_IFUNC
10333 && !h
->forced_local
)
10337 sym
.st_size
= h
->size
;
10338 sym
.st_other
= h
->other
;
10339 switch (h
->root
.type
)
10342 case bfd_link_hash_new
:
10343 case bfd_link_hash_warning
:
10347 case bfd_link_hash_undefined
:
10348 case bfd_link_hash_undefweak
:
10349 input_sec
= bfd_und_section_ptr
;
10350 sym
.st_shndx
= SHN_UNDEF
;
10353 case bfd_link_hash_defined
:
10354 case bfd_link_hash_defweak
:
10356 input_sec
= h
->root
.u
.def
.section
;
10357 if (input_sec
->output_section
!= NULL
)
10360 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10361 input_sec
->output_section
);
10362 if (sym
.st_shndx
== SHN_BAD
)
10365 /* xgettext:c-format */
10366 (_("%pB: could not find output section %pA for input section %pA"),
10367 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10368 bfd_set_error (bfd_error_nonrepresentable_section
);
10369 eoinfo
->failed
= true;
10373 /* ELF symbols in relocatable files are section relative,
10374 but in nonrelocatable files they are virtual
10376 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10377 if (!bfd_link_relocatable (flinfo
->info
))
10379 sym
.st_value
+= input_sec
->output_section
->vma
;
10380 if (h
->type
== STT_TLS
)
10382 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10383 if (tls_sec
!= NULL
)
10384 sym
.st_value
-= tls_sec
->vma
;
10390 BFD_ASSERT (input_sec
->owner
== NULL
10391 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10392 sym
.st_shndx
= SHN_UNDEF
;
10393 input_sec
= bfd_und_section_ptr
;
10398 case bfd_link_hash_common
:
10399 input_sec
= h
->root
.u
.c
.p
->section
;
10400 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10401 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10404 case bfd_link_hash_indirect
:
10405 /* These symbols are created by symbol versioning. They point
10406 to the decorated version of the name. For example, if the
10407 symbol foo@@GNU_1.2 is the default, which should be used when
10408 foo is used with no version, then we add an indirect symbol
10409 foo which points to foo@@GNU_1.2. We ignore these symbols,
10410 since the indirected symbol is already in the hash table. */
10414 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10415 switch (h
->root
.type
)
10417 case bfd_link_hash_common
:
10418 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10420 case bfd_link_hash_defined
:
10421 case bfd_link_hash_defweak
:
10422 if (bed
->common_definition (&sym
))
10423 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10427 case bfd_link_hash_undefined
:
10428 case bfd_link_hash_undefweak
:
10434 if (h
->forced_local
)
10436 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10437 /* Turn off visibility on local symbol. */
10438 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10440 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10441 else if (h
->unique_global
&& h
->def_regular
)
10442 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10443 else if (h
->root
.type
== bfd_link_hash_undefweak
10444 || h
->root
.type
== bfd_link_hash_defweak
)
10445 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10447 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10448 sym
.st_target_internal
= h
->target_internal
;
10450 /* Give the processor backend a chance to tweak the symbol value,
10451 and also to finish up anything that needs to be done for this
10452 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10453 forced local syms when non-shared is due to a historical quirk.
10454 STT_GNU_IFUNC symbol must go through PLT. */
10455 if ((h
->type
== STT_GNU_IFUNC
10457 && !bfd_link_relocatable (flinfo
->info
))
10458 || ((h
->dynindx
!= -1
10459 || h
->forced_local
)
10460 && ((bfd_link_pic (flinfo
->info
)
10461 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10462 || h
->root
.type
!= bfd_link_hash_undefweak
))
10463 || !h
->forced_local
)
10464 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10466 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10467 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10469 eoinfo
->failed
= true;
10474 /* If we are marking the symbol as undefined, and there are no
10475 non-weak references to this symbol from a regular object, then
10476 mark the symbol as weak undefined; if there are non-weak
10477 references, mark the symbol as strong. We can't do this earlier,
10478 because it might not be marked as undefined until the
10479 finish_dynamic_symbol routine gets through with it. */
10480 if (sym
.st_shndx
== SHN_UNDEF
10482 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10483 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10486 type
= ELF_ST_TYPE (sym
.st_info
);
10488 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10489 if (type
== STT_GNU_IFUNC
)
10492 if (h
->ref_regular_nonweak
)
10493 bindtype
= STB_GLOBAL
;
10495 bindtype
= STB_WEAK
;
10496 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10499 /* If this is a symbol defined in a dynamic library, don't use the
10500 symbol size from the dynamic library. Relinking an executable
10501 against a new library may introduce gratuitous changes in the
10502 executable's symbols if we keep the size. */
10503 if (sym
.st_shndx
== SHN_UNDEF
10508 /* If a non-weak symbol with non-default visibility is not defined
10509 locally, it is a fatal error. */
10510 if (!bfd_link_relocatable (flinfo
->info
)
10511 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10512 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10513 && h
->root
.type
== bfd_link_hash_undefined
10514 && !h
->def_regular
)
10518 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10519 /* xgettext:c-format */
10520 msg
= _("%pB: protected symbol `%s' isn't defined");
10521 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10522 /* xgettext:c-format */
10523 msg
= _("%pB: internal symbol `%s' isn't defined");
10525 /* xgettext:c-format */
10526 msg
= _("%pB: hidden symbol `%s' isn't defined");
10527 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10528 bfd_set_error (bfd_error_bad_value
);
10529 eoinfo
->failed
= true;
10533 /* If this symbol should be put in the .dynsym section, then put it
10534 there now. We already know the symbol index. We also fill in
10535 the entry in the .hash section. */
10536 if (h
->dynindx
!= -1
10537 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10538 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10539 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10543 /* Since there is no version information in the dynamic string,
10544 if there is no version info in symbol version section, we will
10545 have a run-time problem if not linking executable, referenced
10546 by shared library, or not bound locally. */
10547 if (h
->verinfo
.verdef
== NULL
10548 && (!bfd_link_executable (flinfo
->info
)
10550 || !h
->def_regular
))
10552 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10554 if (p
&& p
[1] != '\0')
10557 /* xgettext:c-format */
10558 (_("%pB: no symbol version section for versioned symbol `%s'"),
10559 flinfo
->output_bfd
, h
->root
.root
.string
);
10560 eoinfo
->failed
= true;
10565 sym
.st_name
= h
->dynstr_index
;
10566 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10567 + h
->dynindx
* bed
->s
->sizeof_sym
);
10568 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10570 eoinfo
->failed
= true;
10574 /* Inform the linker of the addition of this symbol. */
10576 if (flinfo
->info
->callbacks
->ctf_new_dynsym
)
10577 flinfo
->info
->callbacks
->ctf_new_dynsym (h
->dynindx
, &sym
);
10579 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10581 if (flinfo
->hash_sec
!= NULL
)
10583 size_t hash_entry_size
;
10584 bfd_byte
*bucketpos
;
10586 size_t bucketcount
;
10589 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10590 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10593 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10594 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10595 + (bucket
+ 2) * hash_entry_size
);
10596 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10597 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10599 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10600 ((bfd_byte
*) flinfo
->hash_sec
->contents
10601 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10604 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10606 Elf_Internal_Versym iversym
;
10607 Elf_External_Versym
*eversym
;
10609 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10611 if (h
->verinfo
.verdef
== NULL
10612 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10613 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10614 iversym
.vs_vers
= 1;
10616 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10620 if (h
->verinfo
.vertree
== NULL
)
10621 iversym
.vs_vers
= 1;
10623 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10624 if (flinfo
->info
->create_default_symver
)
10628 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10629 defined locally. */
10630 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10631 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10633 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10634 eversym
+= h
->dynindx
;
10635 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10639 /* If the symbol is undefined, and we didn't output it to .dynsym,
10640 strip it from .symtab too. Obviously we can't do this for
10641 relocatable output or when needed for --emit-relocs. */
10642 else if (input_sec
== bfd_und_section_ptr
10644 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10645 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10646 && !bfd_link_relocatable (flinfo
->info
))
10649 /* Also strip others that we couldn't earlier due to dynamic symbol
10653 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10656 /* Output a FILE symbol so that following locals are not associated
10657 with the wrong input file. We need one for forced local symbols
10658 if we've seen more than one FILE symbol or when we have exactly
10659 one FILE symbol but global symbols are present in a file other
10660 than the one with the FILE symbol. We also need one if linker
10661 defined symbols are present. In practice these conditions are
10662 always met, so just emit the FILE symbol unconditionally. */
10663 if (eoinfo
->localsyms
10664 && !eoinfo
->file_sym_done
10665 && eoinfo
->flinfo
->filesym_count
!= 0)
10667 Elf_Internal_Sym fsym
;
10669 memset (&fsym
, 0, sizeof (fsym
));
10670 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10671 fsym
.st_shndx
= SHN_ABS
;
10672 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10673 bfd_und_section_ptr
, NULL
))
10676 eoinfo
->file_sym_done
= true;
10679 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10680 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10684 eoinfo
->failed
= true;
10689 else if (h
->indx
== -2)
10695 /* Return TRUE if special handling is done for relocs in SEC against
10696 symbols defined in discarded sections. */
10699 elf_section_ignore_discarded_relocs (asection
*sec
)
10701 const struct elf_backend_data
*bed
;
10703 switch (sec
->sec_info_type
)
10705 case SEC_INFO_TYPE_STABS
:
10706 case SEC_INFO_TYPE_EH_FRAME
:
10707 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10713 bed
= get_elf_backend_data (sec
->owner
);
10714 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10715 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10721 /* Return a mask saying how ld should treat relocations in SEC against
10722 symbols defined in discarded sections. If this function returns
10723 COMPLAIN set, ld will issue a warning message. If this function
10724 returns PRETEND set, and the discarded section was link-once and the
10725 same size as the kept link-once section, ld will pretend that the
10726 symbol was actually defined in the kept section. Otherwise ld will
10727 zero the reloc (at least that is the intent, but some cooperation by
10728 the target dependent code is needed, particularly for REL targets). */
10731 _bfd_elf_default_action_discarded (asection
*sec
)
10733 if (sec
->flags
& SEC_DEBUGGING
)
10736 if (strcmp (".eh_frame", sec
->name
) == 0)
10739 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10742 return COMPLAIN
| PRETEND
;
10745 /* Find a match between a section and a member of a section group. */
10748 match_group_member (asection
*sec
, asection
*group
,
10749 struct bfd_link_info
*info
)
10751 asection
*first
= elf_next_in_group (group
);
10752 asection
*s
= first
;
10756 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10759 s
= elf_next_in_group (s
);
10767 /* Check if the kept section of a discarded section SEC can be used
10768 to replace it. Return the replacement if it is OK. Otherwise return
10772 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10776 kept
= sec
->kept_section
;
10779 if ((kept
->flags
& SEC_GROUP
) != 0)
10780 kept
= match_group_member (sec
, kept
, info
);
10783 if ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10784 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
))
10788 /* Get the real kept section. */
10790 for (next
= kept
->kept_section
;
10792 next
= next
->kept_section
)
10796 sec
->kept_section
= kept
;
10801 /* Link an input file into the linker output file. This function
10802 handles all the sections and relocations of the input file at once.
10803 This is so that we only have to read the local symbols once, and
10804 don't have to keep them in memory. */
10807 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10809 int (*relocate_section
)
10810 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10811 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10813 Elf_Internal_Shdr
*symtab_hdr
;
10814 size_t locsymcount
;
10816 Elf_Internal_Sym
*isymbuf
;
10817 Elf_Internal_Sym
*isym
;
10818 Elf_Internal_Sym
*isymend
;
10820 asection
**ppsection
;
10822 const struct elf_backend_data
*bed
;
10823 struct elf_link_hash_entry
**sym_hashes
;
10824 bfd_size_type address_size
;
10825 bfd_vma r_type_mask
;
10827 bool have_file_sym
= false;
10829 output_bfd
= flinfo
->output_bfd
;
10830 bed
= get_elf_backend_data (output_bfd
);
10831 relocate_section
= bed
->elf_backend_relocate_section
;
10833 /* If this is a dynamic object, we don't want to do anything here:
10834 we don't want the local symbols, and we don't want the section
10836 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10839 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10840 if (elf_bad_symtab (input_bfd
))
10842 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10847 locsymcount
= symtab_hdr
->sh_info
;
10848 extsymoff
= symtab_hdr
->sh_info
;
10851 /* Enable GNU OSABI features in the output BFD that are used in the input
10853 if (bed
->elf_osabi
== ELFOSABI_NONE
10854 || bed
->elf_osabi
== ELFOSABI_GNU
10855 || bed
->elf_osabi
== ELFOSABI_FREEBSD
)
10856 elf_tdata (output_bfd
)->has_gnu_osabi
10857 |= (elf_tdata (input_bfd
)->has_gnu_osabi
10858 & (bfd_link_relocatable (flinfo
->info
)
10859 ? -1 : ~elf_gnu_osabi_retain
));
10861 /* Read the local symbols. */
10862 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10863 if (isymbuf
== NULL
&& locsymcount
!= 0)
10865 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10866 flinfo
->internal_syms
,
10867 flinfo
->external_syms
,
10868 flinfo
->locsym_shndx
);
10869 if (isymbuf
== NULL
)
10873 /* Find local symbol sections and adjust values of symbols in
10874 SEC_MERGE sections. Write out those local symbols we know are
10875 going into the output file. */
10876 isymend
= isymbuf
+ locsymcount
;
10877 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10879 isym
++, pindex
++, ppsection
++)
10883 Elf_Internal_Sym osym
;
10889 if (elf_bad_symtab (input_bfd
))
10891 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10898 if (isym
->st_shndx
== SHN_UNDEF
)
10899 isec
= bfd_und_section_ptr
;
10900 else if (isym
->st_shndx
== SHN_ABS
)
10901 isec
= bfd_abs_section_ptr
;
10902 else if (isym
->st_shndx
== SHN_COMMON
)
10903 isec
= bfd_com_section_ptr
;
10906 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10909 /* Don't attempt to output symbols with st_shnx in the
10910 reserved range other than SHN_ABS and SHN_COMMON. */
10911 isec
= bfd_und_section_ptr
;
10913 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10914 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10916 _bfd_merged_section_offset (output_bfd
, &isec
,
10917 elf_section_data (isec
)->sec_info
,
10923 /* Don't output the first, undefined, symbol. In fact, don't
10924 output any undefined local symbol. */
10925 if (isec
== bfd_und_section_ptr
)
10928 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10930 /* We never output section symbols. Instead, we use the
10931 section symbol of the corresponding section in the output
10936 /* If we are stripping all symbols, we don't want to output this
10938 if (flinfo
->info
->strip
== strip_all
)
10941 /* If we are discarding all local symbols, we don't want to
10942 output this one. If we are generating a relocatable output
10943 file, then some of the local symbols may be required by
10944 relocs; we output them below as we discover that they are
10946 if (flinfo
->info
->discard
== discard_all
)
10949 /* If this symbol is defined in a section which we are
10950 discarding, we don't need to keep it. */
10951 if (isym
->st_shndx
!= SHN_UNDEF
10952 && isym
->st_shndx
< SHN_LORESERVE
10953 && isec
->output_section
== NULL
10954 && flinfo
->info
->non_contiguous_regions
10955 && flinfo
->info
->non_contiguous_regions_warnings
)
10957 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10958 "discards section `%s' from '%s'\n"),
10959 isec
->name
, bfd_get_filename (isec
->owner
));
10963 if (isym
->st_shndx
!= SHN_UNDEF
10964 && isym
->st_shndx
< SHN_LORESERVE
10965 && bfd_section_removed_from_list (output_bfd
,
10966 isec
->output_section
))
10969 /* Get the name of the symbol. */
10970 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10975 /* See if we are discarding symbols with this name. */
10976 if ((flinfo
->info
->strip
== strip_some
10977 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, false, false)
10979 || (((flinfo
->info
->discard
== discard_sec_merge
10980 && (isec
->flags
& SEC_MERGE
)
10981 && !bfd_link_relocatable (flinfo
->info
))
10982 || flinfo
->info
->discard
== discard_l
)
10983 && bfd_is_local_label_name (input_bfd
, name
)))
10986 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10988 if (input_bfd
->lto_output
)
10989 /* -flto puts a temp file name here. This means builds
10990 are not reproducible. Discard the symbol. */
10992 have_file_sym
= true;
10993 flinfo
->filesym_count
+= 1;
10995 if (!have_file_sym
)
10997 /* In the absence of debug info, bfd_find_nearest_line uses
10998 FILE symbols to determine the source file for local
10999 function symbols. Provide a FILE symbol here if input
11000 files lack such, so that their symbols won't be
11001 associated with a previous input file. It's not the
11002 source file, but the best we can do. */
11003 const char *filename
;
11004 have_file_sym
= true;
11005 flinfo
->filesym_count
+= 1;
11006 memset (&osym
, 0, sizeof (osym
));
11007 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
11008 osym
.st_shndx
= SHN_ABS
;
11009 if (input_bfd
->lto_output
)
11012 filename
= lbasename (bfd_get_filename (input_bfd
));
11013 if (!elf_link_output_symstrtab (flinfo
, filename
, &osym
,
11014 bfd_abs_section_ptr
, NULL
))
11020 /* Adjust the section index for the output file. */
11021 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11022 isec
->output_section
);
11023 if (osym
.st_shndx
== SHN_BAD
)
11026 /* ELF symbols in relocatable files are section relative, but
11027 in executable files they are virtual addresses. Note that
11028 this code assumes that all ELF sections have an associated
11029 BFD section with a reasonable value for output_offset; below
11030 we assume that they also have a reasonable value for
11031 output_section. Any special sections must be set up to meet
11032 these requirements. */
11033 osym
.st_value
+= isec
->output_offset
;
11034 if (!bfd_link_relocatable (flinfo
->info
))
11036 osym
.st_value
+= isec
->output_section
->vma
;
11037 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
11039 /* STT_TLS symbols are relative to PT_TLS segment base. */
11040 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
11041 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
11043 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
11048 indx
= bfd_get_symcount (output_bfd
);
11049 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
11056 if (bed
->s
->arch_size
== 32)
11058 r_type_mask
= 0xff;
11064 r_type_mask
= 0xffffffff;
11069 /* Relocate the contents of each section. */
11070 sym_hashes
= elf_sym_hashes (input_bfd
);
11071 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
11073 bfd_byte
*contents
;
11075 if (! o
->linker_mark
)
11077 /* This section was omitted from the link. */
11081 if (!flinfo
->info
->resolve_section_groups
11082 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
11084 /* Deal with the group signature symbol. */
11085 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
11086 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
11087 asection
*osec
= o
->output_section
;
11089 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
11090 if (symndx
>= locsymcount
11091 || (elf_bad_symtab (input_bfd
)
11092 && flinfo
->sections
[symndx
] == NULL
))
11094 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
11095 while (h
->root
.type
== bfd_link_hash_indirect
11096 || h
->root
.type
== bfd_link_hash_warning
)
11097 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11098 /* Arrange for symbol to be output. */
11100 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
11102 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
11104 /* We'll use the output section target_index. */
11105 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11106 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
11110 if (flinfo
->indices
[symndx
] == -1)
11112 /* Otherwise output the local symbol now. */
11113 Elf_Internal_Sym sym
= isymbuf
[symndx
];
11114 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11119 name
= bfd_elf_string_from_elf_section (input_bfd
,
11120 symtab_hdr
->sh_link
,
11125 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11127 if (sym
.st_shndx
== SHN_BAD
)
11130 sym
.st_value
+= o
->output_offset
;
11132 indx
= bfd_get_symcount (output_bfd
);
11133 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
11138 flinfo
->indices
[symndx
] = indx
;
11142 elf_section_data (osec
)->this_hdr
.sh_info
11143 = flinfo
->indices
[symndx
];
11147 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11148 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
11151 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
11153 /* Section was created by _bfd_elf_link_create_dynamic_sections
11158 /* Get the contents of the section. They have been cached by a
11159 relaxation routine. Note that o is a section in an input
11160 file, so the contents field will not have been set by any of
11161 the routines which work on output files. */
11162 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
11164 contents
= elf_section_data (o
)->this_hdr
.contents
;
11165 if (bed
->caches_rawsize
11167 && o
->rawsize
< o
->size
)
11169 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
11170 contents
= flinfo
->contents
;
11175 contents
= flinfo
->contents
;
11176 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
11180 if ((o
->flags
& SEC_RELOC
) != 0)
11182 Elf_Internal_Rela
*internal_relocs
;
11183 Elf_Internal_Rela
*rel
, *relend
;
11184 int action_discarded
;
11187 /* Get the swapped relocs. */
11189 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
11190 flinfo
->internal_relocs
, false);
11191 if (internal_relocs
== NULL
11192 && o
->reloc_count
> 0)
11195 /* We need to reverse-copy input .ctors/.dtors sections if
11196 they are placed in .init_array/.finit_array for output. */
11197 if (o
->size
> address_size
11198 && ((startswith (o
->name
, ".ctors")
11199 && strcmp (o
->output_section
->name
,
11200 ".init_array") == 0)
11201 || (startswith (o
->name
, ".dtors")
11202 && strcmp (o
->output_section
->name
,
11203 ".fini_array") == 0))
11204 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
11206 if (o
->size
* bed
->s
->int_rels_per_ext_rel
11207 != o
->reloc_count
* address_size
)
11210 /* xgettext:c-format */
11211 (_("error: %pB: size of section %pA is not "
11212 "multiple of address size"),
11214 bfd_set_error (bfd_error_bad_value
);
11217 o
->flags
|= SEC_ELF_REVERSE_COPY
;
11220 action_discarded
= -1;
11221 if (!elf_section_ignore_discarded_relocs (o
))
11222 action_discarded
= (*bed
->action_discarded
) (o
);
11224 /* Run through the relocs evaluating complex reloc symbols and
11225 looking for relocs against symbols from discarded sections
11226 or section symbols from removed link-once sections.
11227 Complain about relocs against discarded sections. Zero
11228 relocs against removed link-once sections. */
11230 rel
= internal_relocs
;
11231 relend
= rel
+ o
->reloc_count
;
11232 for ( ; rel
< relend
; rel
++)
11234 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
11235 unsigned int s_type
;
11236 asection
**ps
, *sec
;
11237 struct elf_link_hash_entry
*h
= NULL
;
11238 const char *sym_name
;
11240 if (r_symndx
== STN_UNDEF
)
11243 if (r_symndx
>= locsymcount
11244 || (elf_bad_symtab (input_bfd
)
11245 && flinfo
->sections
[r_symndx
] == NULL
))
11247 h
= sym_hashes
[r_symndx
- extsymoff
];
11249 /* Badly formatted input files can contain relocs that
11250 reference non-existant symbols. Check here so that
11251 we do not seg fault. */
11255 /* xgettext:c-format */
11256 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
11257 "that references a non-existent global symbol"),
11258 input_bfd
, (uint64_t) rel
->r_info
, o
);
11259 bfd_set_error (bfd_error_bad_value
);
11263 while (h
->root
.type
== bfd_link_hash_indirect
11264 || h
->root
.type
== bfd_link_hash_warning
)
11265 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11269 /* If a plugin symbol is referenced from a non-IR file,
11270 mark the symbol as undefined. Note that the
11271 linker may attach linker created dynamic sections
11272 to the plugin bfd. Symbols defined in linker
11273 created sections are not plugin symbols. */
11274 if ((h
->root
.non_ir_ref_regular
11275 || h
->root
.non_ir_ref_dynamic
)
11276 && (h
->root
.type
== bfd_link_hash_defined
11277 || h
->root
.type
== bfd_link_hash_defweak
)
11278 && (h
->root
.u
.def
.section
->flags
11279 & SEC_LINKER_CREATED
) == 0
11280 && h
->root
.u
.def
.section
->owner
!= NULL
11281 && (h
->root
.u
.def
.section
->owner
->flags
11282 & BFD_PLUGIN
) != 0)
11284 h
->root
.type
= bfd_link_hash_undefined
;
11285 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11289 if (h
->root
.type
== bfd_link_hash_defined
11290 || h
->root
.type
== bfd_link_hash_defweak
)
11291 ps
= &h
->root
.u
.def
.section
;
11293 sym_name
= h
->root
.root
.string
;
11297 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11299 s_type
= ELF_ST_TYPE (sym
->st_info
);
11300 ps
= &flinfo
->sections
[r_symndx
];
11301 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11305 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11306 && !bfd_link_relocatable (flinfo
->info
))
11309 bfd_vma dot
= (rel
->r_offset
11310 + o
->output_offset
+ o
->output_section
->vma
);
11312 printf ("Encountered a complex symbol!");
11313 printf (" (input_bfd %s, section %s, reloc %ld\n",
11314 bfd_get_filename (input_bfd
), o
->name
,
11315 (long) (rel
- internal_relocs
));
11316 printf (" symbol: idx %8.8lx, name %s\n",
11317 r_symndx
, sym_name
);
11318 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11319 (unsigned long) rel
->r_info
,
11320 (unsigned long) rel
->r_offset
);
11322 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11323 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11326 /* Symbol evaluated OK. Update to absolute value. */
11327 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11332 if (action_discarded
!= -1 && ps
!= NULL
)
11334 /* Complain if the definition comes from a
11335 discarded section. */
11336 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11338 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11339 if (action_discarded
& COMPLAIN
)
11340 (*flinfo
->info
->callbacks
->einfo
)
11341 /* xgettext:c-format */
11342 (_("%X`%s' referenced in section `%pA' of %pB: "
11343 "defined in discarded section `%pA' of %pB\n"),
11344 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11346 /* Try to do the best we can to support buggy old
11347 versions of gcc. Pretend that the symbol is
11348 really defined in the kept linkonce section.
11349 FIXME: This is quite broken. Modifying the
11350 symbol here means we will be changing all later
11351 uses of the symbol, not just in this section. */
11352 if (action_discarded
& PRETEND
)
11356 kept
= _bfd_elf_check_kept_section (sec
,
11368 /* Relocate the section by invoking a back end routine.
11370 The back end routine is responsible for adjusting the
11371 section contents as necessary, and (if using Rela relocs
11372 and generating a relocatable output file) adjusting the
11373 reloc addend as necessary.
11375 The back end routine does not have to worry about setting
11376 the reloc address or the reloc symbol index.
11378 The back end routine is given a pointer to the swapped in
11379 internal symbols, and can access the hash table entries
11380 for the external symbols via elf_sym_hashes (input_bfd).
11382 When generating relocatable output, the back end routine
11383 must handle STB_LOCAL/STT_SECTION symbols specially. The
11384 output symbol is going to be a section symbol
11385 corresponding to the output section, which will require
11386 the addend to be adjusted. */
11388 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11389 input_bfd
, o
, contents
,
11397 || bfd_link_relocatable (flinfo
->info
)
11398 || flinfo
->info
->emitrelocations
)
11400 Elf_Internal_Rela
*irela
;
11401 Elf_Internal_Rela
*irelaend
, *irelamid
;
11402 bfd_vma last_offset
;
11403 struct elf_link_hash_entry
**rel_hash
;
11404 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11405 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11406 unsigned int next_erel
;
11408 struct bfd_elf_section_data
*esdi
, *esdo
;
11410 esdi
= elf_section_data (o
);
11411 esdo
= elf_section_data (o
->output_section
);
11412 rela_normal
= false;
11414 /* Adjust the reloc addresses and symbol indices. */
11416 irela
= internal_relocs
;
11417 irelaend
= irela
+ o
->reloc_count
;
11418 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11419 /* We start processing the REL relocs, if any. When we reach
11420 IRELAMID in the loop, we switch to the RELA relocs. */
11422 if (esdi
->rel
.hdr
!= NULL
)
11423 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11424 * bed
->s
->int_rels_per_ext_rel
);
11425 rel_hash_list
= rel_hash
;
11426 rela_hash_list
= NULL
;
11427 last_offset
= o
->output_offset
;
11428 if (!bfd_link_relocatable (flinfo
->info
))
11429 last_offset
+= o
->output_section
->vma
;
11430 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11432 unsigned long r_symndx
;
11434 Elf_Internal_Sym sym
;
11436 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11442 if (irela
== irelamid
)
11444 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11445 rela_hash_list
= rel_hash
;
11446 rela_normal
= bed
->rela_normal
;
11449 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11452 if (irela
->r_offset
>= (bfd_vma
) -2)
11454 /* This is a reloc for a deleted entry or somesuch.
11455 Turn it into an R_*_NONE reloc, at the same
11456 offset as the last reloc. elf_eh_frame.c and
11457 bfd_elf_discard_info rely on reloc offsets
11459 irela
->r_offset
= last_offset
;
11461 irela
->r_addend
= 0;
11465 irela
->r_offset
+= o
->output_offset
;
11467 /* Relocs in an executable have to be virtual addresses. */
11468 if (!bfd_link_relocatable (flinfo
->info
))
11469 irela
->r_offset
+= o
->output_section
->vma
;
11471 last_offset
= irela
->r_offset
;
11473 r_symndx
= irela
->r_info
>> r_sym_shift
;
11474 if (r_symndx
== STN_UNDEF
)
11477 if (r_symndx
>= locsymcount
11478 || (elf_bad_symtab (input_bfd
)
11479 && flinfo
->sections
[r_symndx
] == NULL
))
11481 struct elf_link_hash_entry
*rh
;
11482 unsigned long indx
;
11484 /* This is a reloc against a global symbol. We
11485 have not yet output all the local symbols, so
11486 we do not know the symbol index of any global
11487 symbol. We set the rel_hash entry for this
11488 reloc to point to the global hash table entry
11489 for this symbol. The symbol index is then
11490 set at the end of bfd_elf_final_link. */
11491 indx
= r_symndx
- extsymoff
;
11492 rh
= elf_sym_hashes (input_bfd
)[indx
];
11493 while (rh
->root
.type
== bfd_link_hash_indirect
11494 || rh
->root
.type
== bfd_link_hash_warning
)
11495 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11497 /* Setting the index to -2 tells
11498 elf_link_output_extsym that this symbol is
11499 used by a reloc. */
11500 BFD_ASSERT (rh
->indx
< 0);
11507 /* This is a reloc against a local symbol. */
11510 sym
= isymbuf
[r_symndx
];
11511 sec
= flinfo
->sections
[r_symndx
];
11512 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11514 /* I suppose the backend ought to fill in the
11515 section of any STT_SECTION symbol against a
11516 processor specific section. */
11517 r_symndx
= STN_UNDEF
;
11518 if (bfd_is_abs_section (sec
))
11520 else if (sec
== NULL
|| sec
->owner
== NULL
)
11522 bfd_set_error (bfd_error_bad_value
);
11527 asection
*osec
= sec
->output_section
;
11529 /* If we have discarded a section, the output
11530 section will be the absolute section. In
11531 case of discarded SEC_MERGE sections, use
11532 the kept section. relocate_section should
11533 have already handled discarded linkonce
11535 if (bfd_is_abs_section (osec
)
11536 && sec
->kept_section
!= NULL
11537 && sec
->kept_section
->output_section
!= NULL
)
11539 osec
= sec
->kept_section
->output_section
;
11540 irela
->r_addend
-= osec
->vma
;
11543 if (!bfd_is_abs_section (osec
))
11545 r_symndx
= osec
->target_index
;
11546 if (r_symndx
== STN_UNDEF
)
11548 irela
->r_addend
+= osec
->vma
;
11549 osec
= _bfd_nearby_section (output_bfd
, osec
,
11551 irela
->r_addend
-= osec
->vma
;
11552 r_symndx
= osec
->target_index
;
11557 /* Adjust the addend according to where the
11558 section winds up in the output section. */
11560 irela
->r_addend
+= sec
->output_offset
;
11564 if (flinfo
->indices
[r_symndx
] == -1)
11566 unsigned long shlink
;
11571 if (flinfo
->info
->strip
== strip_all
)
11573 /* You can't do ld -r -s. */
11574 bfd_set_error (bfd_error_invalid_operation
);
11578 /* This symbol was skipped earlier, but
11579 since it is needed by a reloc, we
11580 must output it now. */
11581 shlink
= symtab_hdr
->sh_link
;
11582 name
= (bfd_elf_string_from_elf_section
11583 (input_bfd
, shlink
, sym
.st_name
));
11587 osec
= sec
->output_section
;
11589 _bfd_elf_section_from_bfd_section (output_bfd
,
11591 if (sym
.st_shndx
== SHN_BAD
)
11594 sym
.st_value
+= sec
->output_offset
;
11595 if (!bfd_link_relocatable (flinfo
->info
))
11597 sym
.st_value
+= osec
->vma
;
11598 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11600 struct elf_link_hash_table
*htab
11601 = elf_hash_table (flinfo
->info
);
11603 /* STT_TLS symbols are relative to PT_TLS
11605 if (htab
->tls_sec
!= NULL
)
11606 sym
.st_value
-= htab
->tls_sec
->vma
;
11609 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11614 indx
= bfd_get_symcount (output_bfd
);
11615 ret
= elf_link_output_symstrtab (flinfo
, name
,
11621 flinfo
->indices
[r_symndx
] = indx
;
11626 r_symndx
= flinfo
->indices
[r_symndx
];
11629 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11630 | (irela
->r_info
& r_type_mask
));
11633 /* Swap out the relocs. */
11634 input_rel_hdr
= esdi
->rel
.hdr
;
11635 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11637 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11642 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11643 * bed
->s
->int_rels_per_ext_rel
);
11644 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11647 input_rela_hdr
= esdi
->rela
.hdr
;
11648 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11650 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11659 /* Write out the modified section contents. */
11660 if (bed
->elf_backend_write_section
11661 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11664 /* Section written out. */
11666 else switch (o
->sec_info_type
)
11668 case SEC_INFO_TYPE_STABS
:
11669 if (! (_bfd_write_section_stabs
11671 &elf_hash_table (flinfo
->info
)->stab_info
,
11672 o
, &elf_section_data (o
)->sec_info
, contents
)))
11675 case SEC_INFO_TYPE_MERGE
:
11676 if (! _bfd_write_merged_section (output_bfd
, o
,
11677 elf_section_data (o
)->sec_info
))
11680 case SEC_INFO_TYPE_EH_FRAME
:
11682 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11687 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11689 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11697 if (! (o
->flags
& SEC_EXCLUDE
))
11699 file_ptr offset
= (file_ptr
) o
->output_offset
;
11700 bfd_size_type todo
= o
->size
;
11702 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11704 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11706 /* Reverse-copy input section to output. */
11709 todo
-= address_size
;
11710 if (! bfd_set_section_contents (output_bfd
,
11718 offset
+= address_size
;
11722 else if (! bfd_set_section_contents (output_bfd
,
11736 /* Generate a reloc when linking an ELF file. This is a reloc
11737 requested by the linker, and does not come from any input file. This
11738 is used to build constructor and destructor tables when linking
11742 elf_reloc_link_order (bfd
*output_bfd
,
11743 struct bfd_link_info
*info
,
11744 asection
*output_section
,
11745 struct bfd_link_order
*link_order
)
11747 reloc_howto_type
*howto
;
11751 struct bfd_elf_section_reloc_data
*reldata
;
11752 struct elf_link_hash_entry
**rel_hash_ptr
;
11753 Elf_Internal_Shdr
*rel_hdr
;
11754 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11755 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11758 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11760 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11763 bfd_set_error (bfd_error_bad_value
);
11767 addend
= link_order
->u
.reloc
.p
->addend
;
11770 reldata
= &esdo
->rel
;
11771 else if (esdo
->rela
.hdr
)
11772 reldata
= &esdo
->rela
;
11779 /* Figure out the symbol index. */
11780 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11781 if (link_order
->type
== bfd_section_reloc_link_order
)
11783 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11784 BFD_ASSERT (indx
!= 0);
11785 *rel_hash_ptr
= NULL
;
11789 struct elf_link_hash_entry
*h
;
11791 /* Treat a reloc against a defined symbol as though it were
11792 actually against the section. */
11793 h
= ((struct elf_link_hash_entry
*)
11794 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11795 link_order
->u
.reloc
.p
->u
.name
,
11796 false, false, true));
11798 && (h
->root
.type
== bfd_link_hash_defined
11799 || h
->root
.type
== bfd_link_hash_defweak
))
11803 section
= h
->root
.u
.def
.section
;
11804 indx
= section
->output_section
->target_index
;
11805 *rel_hash_ptr
= NULL
;
11806 /* It seems that we ought to add the symbol value to the
11807 addend here, but in practice it has already been added
11808 because it was passed to constructor_callback. */
11809 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11811 else if (h
!= NULL
)
11813 /* Setting the index to -2 tells elf_link_output_extsym that
11814 this symbol is used by a reloc. */
11821 (*info
->callbacks
->unattached_reloc
)
11822 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11827 /* If this is an inplace reloc, we must write the addend into the
11829 if (howto
->partial_inplace
&& addend
!= 0)
11831 bfd_size_type size
;
11832 bfd_reloc_status_type rstat
;
11835 const char *sym_name
;
11836 bfd_size_type octets
;
11838 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11839 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11840 if (buf
== NULL
&& size
!= 0)
11842 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11849 case bfd_reloc_outofrange
:
11852 case bfd_reloc_overflow
:
11853 if (link_order
->type
== bfd_section_reloc_link_order
)
11854 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11856 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11857 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11858 howto
->name
, addend
, NULL
, NULL
,
11863 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11865 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11872 /* The address of a reloc is relative to the section in a
11873 relocatable file, and is a virtual address in an executable
11875 offset
= link_order
->offset
;
11876 if (! bfd_link_relocatable (info
))
11877 offset
+= output_section
->vma
;
11879 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11881 irel
[i
].r_offset
= offset
;
11882 irel
[i
].r_info
= 0;
11883 irel
[i
].r_addend
= 0;
11885 if (bed
->s
->arch_size
== 32)
11886 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11888 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11890 rel_hdr
= reldata
->hdr
;
11891 erel
= rel_hdr
->contents
;
11892 if (rel_hdr
->sh_type
== SHT_REL
)
11894 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11895 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11899 irel
[0].r_addend
= addend
;
11900 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11901 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11909 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11910 Returns TRUE upon success, FALSE otherwise. */
11913 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11917 const struct elf_backend_data
*bed
;
11919 enum bfd_architecture arch
;
11921 asymbol
**sympp
= NULL
;
11925 elf_symbol_type
*osymbuf
;
11928 implib_bfd
= info
->out_implib_bfd
;
11929 bed
= get_elf_backend_data (abfd
);
11931 if (!bfd_set_format (implib_bfd
, bfd_object
))
11934 /* Use flag from executable but make it a relocatable object. */
11935 flags
= bfd_get_file_flags (abfd
);
11936 flags
&= ~HAS_RELOC
;
11937 if (!bfd_set_start_address (implib_bfd
, 0)
11938 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11941 /* Copy architecture of output file to import library file. */
11942 arch
= bfd_get_arch (abfd
);
11943 mach
= bfd_get_mach (abfd
);
11944 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11945 && (abfd
->target_defaulted
11946 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11949 /* Get symbol table size. */
11950 symsize
= bfd_get_symtab_upper_bound (abfd
);
11954 /* Read in the symbol table. */
11955 sympp
= (asymbol
**) bfd_malloc (symsize
);
11959 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11963 /* Allow the BFD backend to copy any private header data it
11964 understands from the output BFD to the import library BFD. */
11965 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11968 /* Filter symbols to appear in the import library. */
11969 if (bed
->elf_backend_filter_implib_symbols
)
11970 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11973 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11976 bfd_set_error (bfd_error_no_symbols
);
11977 _bfd_error_handler (_("%pB: no symbol found for import library"),
11983 /* Make symbols absolute. */
11984 amt
= symcount
* sizeof (*osymbuf
);
11985 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11986 if (osymbuf
== NULL
)
11989 for (src_count
= 0; src_count
< symcount
; src_count
++)
11991 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11992 sizeof (*osymbuf
));
11993 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11994 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11995 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11996 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11997 osymbuf
[src_count
].symbol
.value
;
11998 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
12001 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
12003 /* Allow the BFD backend to copy any private data it understands
12004 from the output BFD to the import library BFD. This is done last
12005 to permit the routine to look at the filtered symbol table. */
12006 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
12009 if (!bfd_close (implib_bfd
))
12020 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
12024 if (flinfo
->symstrtab
!= NULL
)
12025 _bfd_elf_strtab_free (flinfo
->symstrtab
);
12026 free (flinfo
->contents
);
12027 free (flinfo
->external_relocs
);
12028 free (flinfo
->internal_relocs
);
12029 free (flinfo
->external_syms
);
12030 free (flinfo
->locsym_shndx
);
12031 free (flinfo
->internal_syms
);
12032 free (flinfo
->indices
);
12033 free (flinfo
->sections
);
12034 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
12035 free (flinfo
->symshndxbuf
);
12036 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
12038 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12039 free (esdo
->rel
.hashes
);
12040 free (esdo
->rela
.hashes
);
12044 /* Do the final step of an ELF link. */
12047 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12052 struct elf_final_link_info flinfo
;
12054 struct bfd_link_order
*p
;
12056 bfd_size_type max_contents_size
;
12057 bfd_size_type max_external_reloc_size
;
12058 bfd_size_type max_internal_reloc_count
;
12059 bfd_size_type max_sym_count
;
12060 bfd_size_type max_sym_shndx_count
;
12061 Elf_Internal_Sym elfsym
;
12063 Elf_Internal_Shdr
*symtab_hdr
;
12064 Elf_Internal_Shdr
*symtab_shndx_hdr
;
12065 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12066 struct elf_outext_info eoinfo
;
12068 size_t relativecount
= 0;
12069 asection
*reldyn
= 0;
12071 asection
*attr_section
= NULL
;
12072 bfd_vma attr_size
= 0;
12073 const char *std_attrs_section
;
12074 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
12075 bool sections_removed
;
12078 if (!is_elf_hash_table (&htab
->root
))
12081 if (bfd_link_pic (info
))
12082 abfd
->flags
|= DYNAMIC
;
12084 dynamic
= htab
->dynamic_sections_created
;
12085 dynobj
= htab
->dynobj
;
12087 emit_relocs
= (bfd_link_relocatable (info
)
12088 || info
->emitrelocations
);
12090 memset (&flinfo
, 0, sizeof (flinfo
));
12091 flinfo
.info
= info
;
12092 flinfo
.output_bfd
= abfd
;
12093 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
12094 if (flinfo
.symstrtab
== NULL
)
12099 flinfo
.hash_sec
= NULL
;
12100 flinfo
.symver_sec
= NULL
;
12104 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
12105 /* Note that dynsym_sec can be NULL (on VMS). */
12106 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
12107 /* Note that it is OK if symver_sec is NULL. */
12110 if (info
->unique_symbol
12111 && !bfd_hash_table_init (&flinfo
.local_hash_table
,
12112 local_hash_newfunc
,
12113 sizeof (struct local_hash_entry
)))
12116 /* The object attributes have been merged. Remove the input
12117 sections from the link, and set the contents of the output
12119 sections_removed
= false;
12120 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
12121 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12123 bool remove_section
= false;
12125 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
12126 || strcmp (o
->name
, ".gnu.attributes") == 0)
12128 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12130 asection
*input_section
;
12132 if (p
->type
!= bfd_indirect_link_order
)
12134 input_section
= p
->u
.indirect
.section
;
12135 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12136 elf_link_input_bfd ignores this section. */
12137 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12140 attr_size
= bfd_elf_obj_attr_size (abfd
);
12141 bfd_set_section_size (o
, attr_size
);
12142 /* Skip this section later on. */
12143 o
->map_head
.link_order
= NULL
;
12147 remove_section
= true;
12149 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12151 /* Remove empty group section from linker output. */
12152 remove_section
= true;
12154 if (remove_section
)
12156 o
->flags
|= SEC_EXCLUDE
;
12157 bfd_section_list_remove (abfd
, o
);
12158 abfd
->section_count
--;
12159 sections_removed
= true;
12162 if (sections_removed
)
12163 _bfd_fix_excluded_sec_syms (abfd
, info
);
12165 /* Count up the number of relocations we will output for each output
12166 section, so that we know the sizes of the reloc sections. We
12167 also figure out some maximum sizes. */
12168 max_contents_size
= 0;
12169 max_external_reloc_size
= 0;
12170 max_internal_reloc_count
= 0;
12172 max_sym_shndx_count
= 0;
12174 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12176 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12177 o
->reloc_count
= 0;
12179 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12181 unsigned int reloc_count
= 0;
12182 unsigned int additional_reloc_count
= 0;
12183 struct bfd_elf_section_data
*esdi
= NULL
;
12185 if (p
->type
== bfd_section_reloc_link_order
12186 || p
->type
== bfd_symbol_reloc_link_order
)
12188 else if (p
->type
== bfd_indirect_link_order
)
12192 sec
= p
->u
.indirect
.section
;
12194 /* Mark all sections which are to be included in the
12195 link. This will normally be every section. We need
12196 to do this so that we can identify any sections which
12197 the linker has decided to not include. */
12198 sec
->linker_mark
= true;
12200 if (sec
->flags
& SEC_MERGE
)
12203 if (sec
->rawsize
> max_contents_size
)
12204 max_contents_size
= sec
->rawsize
;
12205 if (sec
->size
> max_contents_size
)
12206 max_contents_size
= sec
->size
;
12208 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12209 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12213 /* We are interested in just local symbols, not all
12215 if (elf_bad_symtab (sec
->owner
))
12216 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12217 / bed
->s
->sizeof_sym
);
12219 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12221 if (sym_count
> max_sym_count
)
12222 max_sym_count
= sym_count
;
12224 if (sym_count
> max_sym_shndx_count
12225 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12226 max_sym_shndx_count
= sym_count
;
12228 if (esdo
->this_hdr
.sh_type
== SHT_REL
12229 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12230 /* Some backends use reloc_count in relocation sections
12231 to count particular types of relocs. Of course,
12232 reloc sections themselves can't have relocations. */
12234 else if (emit_relocs
)
12236 reloc_count
= sec
->reloc_count
;
12237 if (bed
->elf_backend_count_additional_relocs
)
12240 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12241 additional_reloc_count
+= c
;
12244 else if (bed
->elf_backend_count_relocs
)
12245 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12247 esdi
= elf_section_data (sec
);
12249 if ((sec
->flags
& SEC_RELOC
) != 0)
12251 size_t ext_size
= 0;
12253 if (esdi
->rel
.hdr
!= NULL
)
12254 ext_size
= esdi
->rel
.hdr
->sh_size
;
12255 if (esdi
->rela
.hdr
!= NULL
)
12256 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12258 if (ext_size
> max_external_reloc_size
)
12259 max_external_reloc_size
= ext_size
;
12260 if (sec
->reloc_count
> max_internal_reloc_count
)
12261 max_internal_reloc_count
= sec
->reloc_count
;
12266 if (reloc_count
== 0)
12269 reloc_count
+= additional_reloc_count
;
12270 o
->reloc_count
+= reloc_count
;
12272 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12276 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12277 esdo
->rel
.count
+= additional_reloc_count
;
12279 if (esdi
->rela
.hdr
)
12281 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12282 esdo
->rela
.count
+= additional_reloc_count
;
12288 esdo
->rela
.count
+= reloc_count
;
12290 esdo
->rel
.count
+= reloc_count
;
12294 if (o
->reloc_count
> 0)
12295 o
->flags
|= SEC_RELOC
;
12298 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12299 set it (this is probably a bug) and if it is set
12300 assign_section_numbers will create a reloc section. */
12301 o
->flags
&=~ SEC_RELOC
;
12304 /* If the SEC_ALLOC flag is not set, force the section VMA to
12305 zero. This is done in elf_fake_sections as well, but forcing
12306 the VMA to 0 here will ensure that relocs against these
12307 sections are handled correctly. */
12308 if ((o
->flags
& SEC_ALLOC
) == 0
12309 && ! o
->user_set_vma
)
12313 if (! bfd_link_relocatable (info
) && merged
)
12314 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12316 /* Figure out the file positions for everything but the symbol table
12317 and the relocs. We set symcount to force assign_section_numbers
12318 to create a symbol table. */
12319 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12320 BFD_ASSERT (! abfd
->output_has_begun
);
12321 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12324 /* Set sizes, and assign file positions for reloc sections. */
12325 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12327 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12328 if ((o
->flags
& SEC_RELOC
) != 0)
12331 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12335 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12339 /* _bfd_elf_compute_section_file_positions makes temporary use
12340 of target_index. Reset it. */
12341 o
->target_index
= 0;
12343 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12344 to count upwards while actually outputting the relocations. */
12345 esdo
->rel
.count
= 0;
12346 esdo
->rela
.count
= 0;
12348 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12349 && !bfd_section_is_ctf (o
))
12351 /* Cache the section contents so that they can be compressed
12352 later. Use bfd_malloc since it will be freed by
12353 bfd_compress_section_contents. */
12354 unsigned char *contents
= esdo
->this_hdr
.contents
;
12355 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12358 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12359 if (contents
== NULL
)
12361 esdo
->this_hdr
.contents
= contents
;
12365 /* We have now assigned file positions for all the sections except .symtab,
12366 .strtab, and non-loaded reloc and compressed debugging sections. We start
12367 the .symtab section at the current file position, and write directly to it.
12368 We build the .strtab section in memory. */
12369 abfd
->symcount
= 0;
12370 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12371 /* sh_name is set in prep_headers. */
12372 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12373 /* sh_flags, sh_addr and sh_size all start off zero. */
12374 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12375 /* sh_link is set in assign_section_numbers. */
12376 /* sh_info is set below. */
12377 /* sh_offset is set just below. */
12378 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12380 if (max_sym_count
< 20)
12381 max_sym_count
= 20;
12382 htab
->strtabsize
= max_sym_count
;
12383 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12384 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12385 if (htab
->strtab
== NULL
)
12387 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12389 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12390 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12392 if (info
->strip
!= strip_all
|| emit_relocs
)
12394 file_ptr off
= elf_next_file_pos (abfd
);
12396 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
12398 /* Note that at this point elf_next_file_pos (abfd) is
12399 incorrect. We do not yet know the size of the .symtab section.
12400 We correct next_file_pos below, after we do know the size. */
12402 /* Start writing out the symbol table. The first symbol is always a
12404 elfsym
.st_value
= 0;
12405 elfsym
.st_size
= 0;
12406 elfsym
.st_info
= 0;
12407 elfsym
.st_other
= 0;
12408 elfsym
.st_shndx
= SHN_UNDEF
;
12409 elfsym
.st_target_internal
= 0;
12410 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12411 bfd_und_section_ptr
, NULL
) != 1)
12414 /* Output a symbol for each section if asked or they are used for
12415 relocs. These symbols usually have no names. We store the
12416 index of each one in the index field of the section, so that
12417 we can find it again when outputting relocs. */
12419 if (bfd_keep_unused_section_symbols (abfd
) || emit_relocs
)
12421 bool name_local_sections
12422 = (bed
->elf_backend_name_local_section_symbols
12423 && bed
->elf_backend_name_local_section_symbols (abfd
));
12424 const char *name
= NULL
;
12426 elfsym
.st_size
= 0;
12427 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12428 elfsym
.st_other
= 0;
12429 elfsym
.st_value
= 0;
12430 elfsym
.st_target_internal
= 0;
12431 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12433 o
= bfd_section_from_elf_index (abfd
, i
);
12436 o
->target_index
= bfd_get_symcount (abfd
);
12437 elfsym
.st_shndx
= i
;
12438 if (!bfd_link_relocatable (info
))
12439 elfsym
.st_value
= o
->vma
;
12440 if (name_local_sections
)
12442 if (elf_link_output_symstrtab (&flinfo
, name
, &elfsym
, o
,
12450 /* On some targets like Irix 5 the symbol split between local and global
12451 ones recorded in the sh_info field needs to be done between section
12452 and all other symbols. */
12453 if (bed
->elf_backend_elfsym_local_is_section
12454 && bed
->elf_backend_elfsym_local_is_section (abfd
))
12455 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12457 /* Allocate some memory to hold information read in from the input
12459 if (max_contents_size
!= 0)
12461 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12462 if (flinfo
.contents
== NULL
)
12466 if (max_external_reloc_size
!= 0)
12468 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12469 if (flinfo
.external_relocs
== NULL
)
12473 if (max_internal_reloc_count
!= 0)
12475 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12476 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12477 if (flinfo
.internal_relocs
== NULL
)
12481 if (max_sym_count
!= 0)
12483 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12484 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12485 if (flinfo
.external_syms
== NULL
)
12488 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12489 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12490 if (flinfo
.internal_syms
== NULL
)
12493 amt
= max_sym_count
* sizeof (long);
12494 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12495 if (flinfo
.indices
== NULL
)
12498 amt
= max_sym_count
* sizeof (asection
*);
12499 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12500 if (flinfo
.sections
== NULL
)
12504 if (max_sym_shndx_count
!= 0)
12506 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12507 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12508 if (flinfo
.locsym_shndx
== NULL
)
12514 bfd_vma base
, end
= 0; /* Both bytes. */
12517 for (sec
= htab
->tls_sec
;
12518 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12521 bfd_size_type size
= sec
->size
;
12522 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12525 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12527 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12530 size
= ord
->offset
* opb
+ ord
->size
;
12532 end
= sec
->vma
+ size
/ opb
;
12534 base
= htab
->tls_sec
->vma
;
12535 /* Only align end of TLS section if static TLS doesn't have special
12536 alignment requirements. */
12537 if (bed
->static_tls_alignment
== 1)
12538 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12539 htab
->tls_size
= end
- base
;
12542 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12545 /* Since ELF permits relocations to be against local symbols, we
12546 must have the local symbols available when we do the relocations.
12547 Since we would rather only read the local symbols once, and we
12548 would rather not keep them in memory, we handle all the
12549 relocations for a single input file at the same time.
12551 Unfortunately, there is no way to know the total number of local
12552 symbols until we have seen all of them, and the local symbol
12553 indices precede the global symbol indices. This means that when
12554 we are generating relocatable output, and we see a reloc against
12555 a global symbol, we can not know the symbol index until we have
12556 finished examining all the local symbols to see which ones we are
12557 going to output. To deal with this, we keep the relocations in
12558 memory, and don't output them until the end of the link. This is
12559 an unfortunate waste of memory, but I don't see a good way around
12560 it. Fortunately, it only happens when performing a relocatable
12561 link, which is not the common case. FIXME: If keep_memory is set
12562 we could write the relocs out and then read them again; I don't
12563 know how bad the memory loss will be. */
12565 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12566 sub
->output_has_begun
= false;
12567 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12569 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12571 if (p
->type
== bfd_indirect_link_order
12572 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12573 == bfd_target_elf_flavour
)
12574 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12576 if (! sub
->output_has_begun
)
12578 if (! elf_link_input_bfd (&flinfo
, sub
))
12580 sub
->output_has_begun
= true;
12583 else if (p
->type
== bfd_section_reloc_link_order
12584 || p
->type
== bfd_symbol_reloc_link_order
)
12586 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12591 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12593 if (p
->type
== bfd_indirect_link_order
12594 && (bfd_get_flavour (sub
)
12595 == bfd_target_elf_flavour
)
12596 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12597 != bed
->s
->elfclass
))
12599 const char *iclass
, *oclass
;
12601 switch (bed
->s
->elfclass
)
12603 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12604 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12605 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12609 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12611 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12612 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12613 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12617 bfd_set_error (bfd_error_wrong_format
);
12619 /* xgettext:c-format */
12620 (_("%pB: file class %s incompatible with %s"),
12621 sub
, iclass
, oclass
);
12630 /* Free symbol buffer if needed. */
12631 if (!info
->reduce_memory_overheads
)
12633 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12634 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12636 free (elf_tdata (sub
)->symbuf
);
12637 elf_tdata (sub
)->symbuf
= NULL
;
12643 /* Output any global symbols that got converted to local in a
12644 version script or due to symbol visibility. We do this in a
12645 separate step since ELF requires all local symbols to appear
12646 prior to any global symbols. FIXME: We should only do this if
12647 some global symbols were, in fact, converted to become local.
12648 FIXME: Will this work correctly with the Irix 5 linker? */
12649 eoinfo
.failed
= false;
12650 eoinfo
.flinfo
= &flinfo
;
12651 eoinfo
.localsyms
= true;
12652 eoinfo
.file_sym_done
= false;
12653 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12657 goto return_local_hash_table
;
12660 /* If backend needs to output some local symbols not present in the hash
12661 table, do it now. */
12662 if (bed
->elf_backend_output_arch_local_syms
12663 && (info
->strip
!= strip_all
|| emit_relocs
))
12665 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12666 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
12669 goto return_local_hash_table
;
12673 /* That wrote out all the local symbols. Finish up the symbol table
12674 with the global symbols. Even if we want to strip everything we
12675 can, we still need to deal with those global symbols that got
12676 converted to local in a version script. */
12678 /* The sh_info field records the index of the first non local symbol. */
12679 if (!symtab_hdr
->sh_info
)
12680 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12683 && htab
->dynsym
!= NULL
12684 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12686 Elf_Internal_Sym sym
;
12687 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12689 o
= htab
->dynsym
->output_section
;
12690 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12692 /* Write out the section symbols for the output sections. */
12693 if (bfd_link_pic (info
)
12694 || htab
->is_relocatable_executable
)
12700 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12702 sym
.st_target_internal
= 0;
12704 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12710 dynindx
= elf_section_data (s
)->dynindx
;
12713 indx
= elf_section_data (s
)->this_idx
;
12714 BFD_ASSERT (indx
> 0);
12715 sym
.st_shndx
= indx
;
12716 if (! check_dynsym (abfd
, &sym
))
12719 goto return_local_hash_table
;
12721 sym
.st_value
= s
->vma
;
12722 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12724 /* Inform the linker of the addition of this symbol. */
12726 if (info
->callbacks
->ctf_new_dynsym
)
12727 info
->callbacks
->ctf_new_dynsym (dynindx
, &sym
);
12729 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12733 /* Write out the local dynsyms. */
12734 if (htab
->dynlocal
)
12736 struct elf_link_local_dynamic_entry
*e
;
12737 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12742 /* Copy the internal symbol and turn off visibility.
12743 Note that we saved a word of storage and overwrote
12744 the original st_name with the dynstr_index. */
12746 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12747 sym
.st_shndx
= SHN_UNDEF
;
12749 s
= bfd_section_from_elf_index (e
->input_bfd
,
12752 && s
->output_section
!= NULL
12753 && elf_section_data (s
->output_section
) != NULL
)
12756 elf_section_data (s
->output_section
)->this_idx
;
12757 if (! check_dynsym (abfd
, &sym
))
12760 goto return_local_hash_table
;
12762 sym
.st_value
= (s
->output_section
->vma
12764 + e
->isym
.st_value
);
12767 /* Inform the linker of the addition of this symbol. */
12769 if (info
->callbacks
->ctf_new_dynsym
)
12770 info
->callbacks
->ctf_new_dynsym (e
->dynindx
, &sym
);
12772 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12773 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12778 /* We get the global symbols from the hash table. */
12779 eoinfo
.failed
= false;
12780 eoinfo
.localsyms
= false;
12781 eoinfo
.flinfo
= &flinfo
;
12782 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12786 goto return_local_hash_table
;
12789 /* If backend needs to output some symbols not present in the hash
12790 table, do it now. */
12791 if (bed
->elf_backend_output_arch_syms
12792 && (info
->strip
!= strip_all
|| emit_relocs
))
12794 if (! ((*bed
->elf_backend_output_arch_syms
)
12795 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
12798 goto return_local_hash_table
;
12802 /* Finalize the .strtab section. */
12803 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12805 /* Swap out the .strtab section. */
12806 if (!elf_link_swap_symbols_out (&flinfo
))
12809 goto return_local_hash_table
;
12812 /* Now we know the size of the symtab section. */
12813 if (bfd_get_symcount (abfd
) > 0)
12815 /* Finish up and write out the symbol string table (.strtab)
12817 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12818 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12820 if (elf_symtab_shndx_list (abfd
))
12822 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12824 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12826 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12827 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12828 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12829 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12830 symtab_shndx_hdr
->sh_size
= amt
;
12832 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12835 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12836 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12839 goto return_local_hash_table
;
12844 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12845 /* sh_name was set in prep_headers. */
12846 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12847 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12848 symstrtab_hdr
->sh_addr
= 0;
12849 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12850 symstrtab_hdr
->sh_entsize
= 0;
12851 symstrtab_hdr
->sh_link
= 0;
12852 symstrtab_hdr
->sh_info
= 0;
12853 /* sh_offset is set just below. */
12854 symstrtab_hdr
->sh_addralign
= 1;
12856 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12858 elf_next_file_pos (abfd
) = off
;
12860 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12861 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12864 goto return_local_hash_table
;
12868 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12870 _bfd_error_handler (_("%pB: failed to generate import library"),
12871 info
->out_implib_bfd
);
12873 goto return_local_hash_table
;
12876 /* Adjust the relocs to have the correct symbol indices. */
12877 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12879 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12882 if ((o
->flags
& SEC_RELOC
) == 0)
12885 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12886 if (esdo
->rel
.hdr
!= NULL
12887 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12890 goto return_local_hash_table
;
12892 if (esdo
->rela
.hdr
!= NULL
12893 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12896 goto return_local_hash_table
;
12899 /* Set the reloc_count field to 0 to prevent write_relocs from
12900 trying to swap the relocs out itself. */
12901 o
->reloc_count
= 0;
12904 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12905 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12907 /* If we are linking against a dynamic object, or generating a
12908 shared library, finish up the dynamic linking information. */
12911 bfd_byte
*dyncon
, *dynconend
;
12913 /* Fix up .dynamic entries. */
12914 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12915 BFD_ASSERT (o
!= NULL
);
12917 dyncon
= o
->contents
;
12918 dynconend
= o
->contents
+ o
->size
;
12919 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12921 Elf_Internal_Dyn dyn
;
12924 bfd_size_type sh_size
;
12927 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12934 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12936 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12938 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12939 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12942 dyn
.d_un
.d_val
= relativecount
;
12949 name
= info
->init_function
;
12952 name
= info
->fini_function
;
12955 struct elf_link_hash_entry
*h
;
12957 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
12959 && (h
->root
.type
== bfd_link_hash_defined
12960 || h
->root
.type
== bfd_link_hash_defweak
))
12962 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12963 o
= h
->root
.u
.def
.section
;
12964 if (o
->output_section
!= NULL
)
12965 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12966 + o
->output_offset
);
12969 /* The symbol is imported from another shared
12970 library and does not apply to this one. */
12971 dyn
.d_un
.d_ptr
= 0;
12978 case DT_PREINIT_ARRAYSZ
:
12979 name
= ".preinit_array";
12981 case DT_INIT_ARRAYSZ
:
12982 name
= ".init_array";
12984 case DT_FINI_ARRAYSZ
:
12985 name
= ".fini_array";
12987 o
= bfd_get_section_by_name (abfd
, name
);
12991 (_("could not find section %s"), name
);
12996 (_("warning: %s section has zero size"), name
);
12997 dyn
.d_un
.d_val
= o
->size
;
13000 case DT_PREINIT_ARRAY
:
13001 name
= ".preinit_array";
13003 case DT_INIT_ARRAY
:
13004 name
= ".init_array";
13006 case DT_FINI_ARRAY
:
13007 name
= ".fini_array";
13009 o
= bfd_get_section_by_name (abfd
, name
);
13016 name
= ".gnu.hash";
13025 name
= ".gnu.version_d";
13028 name
= ".gnu.version_r";
13031 name
= ".gnu.version";
13033 o
= bfd_get_linker_section (dynobj
, name
);
13035 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
13038 (_("could not find section %s"), name
);
13041 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
13044 (_("warning: section '%s' is being made into a note"), name
);
13045 bfd_set_error (bfd_error_nonrepresentable_section
);
13048 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
13055 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
13061 for (i
= 1; i
< elf_numsections (abfd
); i
++)
13063 Elf_Internal_Shdr
*hdr
;
13065 hdr
= elf_elfsections (abfd
)[i
];
13066 if (hdr
->sh_type
== type
13067 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
13069 sh_size
+= hdr
->sh_size
;
13071 || sh_addr
> hdr
->sh_addr
)
13072 sh_addr
= hdr
->sh_addr
;
13076 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
13078 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
13080 /* Don't count procedure linkage table relocs in the
13081 overall reloc count. */
13082 sh_size
-= htab
->srelplt
->size
;
13084 /* If the size is zero, make the address zero too.
13085 This is to avoid a glibc bug. If the backend
13086 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
13087 zero, then we'll put DT_RELA at the end of
13088 DT_JMPREL. glibc will interpret the end of
13089 DT_RELA matching the end of DT_JMPREL as the
13090 case where DT_RELA includes DT_JMPREL, and for
13091 LD_BIND_NOW will decide that processing DT_RELA
13092 will process the PLT relocs too. Net result:
13093 No PLT relocs applied. */
13096 /* If .rela.plt is the first .rela section, exclude
13097 it from DT_RELA. */
13098 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
13099 + htab
->srelplt
->output_offset
) * opb
)
13100 sh_addr
+= htab
->srelplt
->size
;
13103 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
13104 dyn
.d_un
.d_val
= sh_size
;
13106 dyn
.d_un
.d_ptr
= sh_addr
;
13109 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13113 /* If we have created any dynamic sections, then output them. */
13114 if (dynobj
!= NULL
)
13116 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
13119 /* Check for DT_TEXTREL (late, in case the backend removes it). */
13120 if (bfd_link_textrel_check (info
)
13121 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
13123 bfd_byte
*dyncon
, *dynconend
;
13125 dyncon
= o
->contents
;
13126 dynconend
= o
->contents
+ o
->size
;
13127 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13129 Elf_Internal_Dyn dyn
;
13131 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13133 if (dyn
.d_tag
== DT_TEXTREL
)
13135 if (info
->textrel_check
== textrel_check_error
)
13136 info
->callbacks
->einfo
13137 (_("%P%X: read-only segment has dynamic relocations\n"));
13138 else if (bfd_link_dll (info
))
13139 info
->callbacks
->einfo
13140 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
13141 else if (bfd_link_pde (info
))
13142 info
->callbacks
->einfo
13143 (_("%P: warning: creating DT_TEXTREL in a PDE\n"));
13145 info
->callbacks
->einfo
13146 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
13152 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
13154 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
13156 || o
->output_section
== bfd_abs_section_ptr
)
13158 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
13160 /* At this point, we are only interested in sections
13161 created by _bfd_elf_link_create_dynamic_sections. */
13164 if (htab
->stab_info
.stabstr
== o
)
13166 if (htab
->eh_info
.hdr_sec
== o
)
13168 if (strcmp (o
->name
, ".dynstr") != 0)
13170 bfd_size_type octets
= ((file_ptr
) o
->output_offset
13171 * bfd_octets_per_byte (abfd
, o
));
13172 if (!bfd_set_section_contents (abfd
, o
->output_section
,
13173 o
->contents
, octets
, o
->size
))
13178 /* The contents of the .dynstr section are actually in a
13182 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
13183 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
13184 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13190 if (!info
->resolve_section_groups
)
13192 bool failed
= false;
13194 BFD_ASSERT (bfd_link_relocatable (info
));
13195 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13200 /* If we have optimized stabs strings, output them. */
13201 if (htab
->stab_info
.stabstr
!= NULL
)
13203 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13207 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13210 if (info
->callbacks
->emit_ctf
)
13211 info
->callbacks
->emit_ctf ();
13213 elf_final_link_free (abfd
, &flinfo
);
13217 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13218 if (contents
== NULL
)
13220 /* Bail out and fail. */
13222 goto return_local_hash_table
;
13224 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13225 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13229 return_local_hash_table
:
13230 if (info
->unique_symbol
)
13231 bfd_hash_table_free (&flinfo
.local_hash_table
);
13235 elf_final_link_free (abfd
, &flinfo
);
13237 goto return_local_hash_table
;
13240 /* Initialize COOKIE for input bfd ABFD. */
13243 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13244 struct bfd_link_info
*info
, bfd
*abfd
)
13246 Elf_Internal_Shdr
*symtab_hdr
;
13247 const struct elf_backend_data
*bed
;
13249 bed
= get_elf_backend_data (abfd
);
13250 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13252 cookie
->abfd
= abfd
;
13253 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13254 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13255 if (cookie
->bad_symtab
)
13257 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13258 cookie
->extsymoff
= 0;
13262 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13263 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13266 if (bed
->s
->arch_size
== 32)
13267 cookie
->r_sym_shift
= 8;
13269 cookie
->r_sym_shift
= 32;
13271 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13272 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13274 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13275 cookie
->locsymcount
, 0,
13277 if (cookie
->locsyms
== NULL
)
13279 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13282 if (info
->keep_memory
)
13283 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13288 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13291 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13293 Elf_Internal_Shdr
*symtab_hdr
;
13295 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13296 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13297 free (cookie
->locsyms
);
13300 /* Initialize the relocation information in COOKIE for input section SEC
13301 of input bfd ABFD. */
13304 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13305 struct bfd_link_info
*info
, bfd
*abfd
,
13308 if (sec
->reloc_count
== 0)
13310 cookie
->rels
= NULL
;
13311 cookie
->relend
= NULL
;
13315 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13316 info
->keep_memory
);
13317 if (cookie
->rels
== NULL
)
13319 cookie
->rel
= cookie
->rels
;
13320 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13322 cookie
->rel
= cookie
->rels
;
13326 /* Free the memory allocated by init_reloc_cookie_rels,
13330 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13333 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13334 free (cookie
->rels
);
13337 /* Initialize the whole of COOKIE for input section SEC. */
13340 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13341 struct bfd_link_info
*info
,
13344 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13346 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13351 fini_reloc_cookie (cookie
, sec
->owner
);
13356 /* Free the memory allocated by init_reloc_cookie_for_section,
13360 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13363 fini_reloc_cookie_rels (cookie
, sec
);
13364 fini_reloc_cookie (cookie
, sec
->owner
);
13367 /* Garbage collect unused sections. */
13369 /* Default gc_mark_hook. */
13372 _bfd_elf_gc_mark_hook (asection
*sec
,
13373 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13374 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13375 struct elf_link_hash_entry
*h
,
13376 Elf_Internal_Sym
*sym
)
13380 switch (h
->root
.type
)
13382 case bfd_link_hash_defined
:
13383 case bfd_link_hash_defweak
:
13384 return h
->root
.u
.def
.section
;
13386 case bfd_link_hash_common
:
13387 return h
->root
.u
.c
.p
->section
;
13394 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13399 /* Return the debug definition section. */
13402 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13403 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13404 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13405 struct elf_link_hash_entry
*h
,
13406 Elf_Internal_Sym
*sym
)
13410 /* Return the global debug definition section. */
13411 if ((h
->root
.type
== bfd_link_hash_defined
13412 || h
->root
.type
== bfd_link_hash_defweak
)
13413 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13414 return h
->root
.u
.def
.section
;
13418 /* Return the local debug definition section. */
13419 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13421 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13428 /* COOKIE->rel describes a relocation against section SEC, which is
13429 a section we've decided to keep. Return the section that contains
13430 the relocation symbol, or NULL if no section contains it. */
13433 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13434 elf_gc_mark_hook_fn gc_mark_hook
,
13435 struct elf_reloc_cookie
*cookie
,
13438 unsigned long r_symndx
;
13439 struct elf_link_hash_entry
*h
, *hw
;
13441 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13442 if (r_symndx
== STN_UNDEF
)
13445 if (r_symndx
>= cookie
->locsymcount
13446 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13450 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13453 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13457 while (h
->root
.type
== bfd_link_hash_indirect
13458 || h
->root
.type
== bfd_link_hash_warning
)
13459 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13461 was_marked
= h
->mark
;
13463 /* Keep all aliases of the symbol too. If an object symbol
13464 needs to be copied into .dynbss then all of its aliases
13465 should be present as dynamic symbols, not just the one used
13466 on the copy relocation. */
13468 while (hw
->is_weakalias
)
13474 if (!was_marked
&& h
->start_stop
&& !h
->root
.ldscript_def
)
13476 if (info
->start_stop_gc
)
13479 /* To work around a glibc bug, mark XXX input sections
13480 when there is a reference to __start_XXX or __stop_XXX
13482 else if (start_stop
!= NULL
)
13484 asection
*s
= h
->u2
.start_stop_section
;
13485 *start_stop
= true;
13490 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13493 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13494 &cookie
->locsyms
[r_symndx
]);
13497 /* COOKIE->rel describes a relocation against section SEC, which is
13498 a section we've decided to keep. Mark the section that contains
13499 the relocation symbol. */
13502 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13504 elf_gc_mark_hook_fn gc_mark_hook
,
13505 struct elf_reloc_cookie
*cookie
)
13508 bool start_stop
= false;
13510 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13511 while (rsec
!= NULL
)
13513 if (!rsec
->gc_mark
)
13515 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13516 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13518 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13523 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13528 /* The mark phase of garbage collection. For a given section, mark
13529 it and any sections in this section's group, and all the sections
13530 which define symbols to which it refers. */
13533 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13535 elf_gc_mark_hook_fn gc_mark_hook
)
13538 asection
*group_sec
, *eh_frame
;
13542 /* Mark all the sections in the group. */
13543 group_sec
= elf_section_data (sec
)->next_in_group
;
13544 if (group_sec
&& !group_sec
->gc_mark
)
13545 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13548 /* Look through the section relocs. */
13550 eh_frame
= elf_eh_frame_section (sec
->owner
);
13551 if ((sec
->flags
& SEC_RELOC
) != 0
13552 && sec
->reloc_count
> 0
13553 && sec
!= eh_frame
)
13555 struct elf_reloc_cookie cookie
;
13557 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13561 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13562 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13567 fini_reloc_cookie_for_section (&cookie
, sec
);
13571 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13573 struct elf_reloc_cookie cookie
;
13575 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13579 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13580 gc_mark_hook
, &cookie
))
13582 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13586 eh_frame
= elf_section_eh_frame_entry (sec
);
13587 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13588 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13594 /* Scan and mark sections in a special or debug section group. */
13597 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13599 /* Point to first section of section group. */
13601 /* Used to iterate the section group. */
13604 bool is_special_grp
= true;
13605 bool is_debug_grp
= true;
13607 /* First scan to see if group contains any section other than debug
13608 and special section. */
13609 ssec
= msec
= elf_next_in_group (grp
);
13612 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13613 is_debug_grp
= false;
13615 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13616 is_special_grp
= false;
13618 msec
= elf_next_in_group (msec
);
13620 while (msec
!= ssec
);
13622 /* If this is a pure debug section group or pure special section group,
13623 keep all sections in this group. */
13624 if (is_debug_grp
|| is_special_grp
)
13629 msec
= elf_next_in_group (msec
);
13631 while (msec
!= ssec
);
13635 /* Keep debug and special sections. */
13638 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13639 elf_gc_mark_hook_fn mark_hook
)
13643 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13647 bool debug_frag_seen
;
13648 bool has_kept_debug_info
;
13650 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13652 isec
= ibfd
->sections
;
13653 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13656 /* Ensure all linker created sections are kept,
13657 see if any other section is already marked,
13658 and note if we have any fragmented debug sections. */
13659 debug_frag_seen
= some_kept
= has_kept_debug_info
= false;
13660 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13662 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13664 else if (isec
->gc_mark
13665 && (isec
->flags
& SEC_ALLOC
) != 0
13666 && elf_section_type (isec
) != SHT_NOTE
)
13670 /* Since all sections, except for backend specific ones,
13671 have been garbage collected, call mark_hook on this
13672 section if any of its linked-to sections is marked. */
13673 asection
*linked_to_sec
;
13674 for (linked_to_sec
= elf_linked_to_section (isec
);
13675 linked_to_sec
!= NULL
&& !linked_to_sec
->linker_mark
;
13676 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13678 if (linked_to_sec
->gc_mark
)
13680 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13684 linked_to_sec
->linker_mark
= 1;
13686 for (linked_to_sec
= elf_linked_to_section (isec
);
13687 linked_to_sec
!= NULL
&& linked_to_sec
->linker_mark
;
13688 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13689 linked_to_sec
->linker_mark
= 0;
13692 if (!debug_frag_seen
13693 && (isec
->flags
& SEC_DEBUGGING
)
13694 && startswith (isec
->name
, ".debug_line."))
13695 debug_frag_seen
= true;
13696 else if (strcmp (bfd_section_name (isec
),
13697 "__patchable_function_entries") == 0
13698 && elf_linked_to_section (isec
) == NULL
)
13699 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13700 "need linked-to section "
13701 "for --gc-sections\n"),
13702 isec
->owner
, isec
);
13705 /* If no non-note alloc section in this file will be kept, then
13706 we can toss out the debug and special sections. */
13710 /* Keep debug and special sections like .comment when they are
13711 not part of a group. Also keep section groups that contain
13712 just debug sections or special sections. NB: Sections with
13713 linked-to section has been handled above. */
13714 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13716 if ((isec
->flags
& SEC_GROUP
) != 0)
13717 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13718 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13719 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13720 && elf_next_in_group (isec
) == NULL
13721 && elf_linked_to_section (isec
) == NULL
)
13723 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13724 has_kept_debug_info
= true;
13727 /* Look for CODE sections which are going to be discarded,
13728 and find and discard any fragmented debug sections which
13729 are associated with that code section. */
13730 if (debug_frag_seen
)
13731 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13732 if ((isec
->flags
& SEC_CODE
) != 0
13733 && isec
->gc_mark
== 0)
13738 ilen
= strlen (isec
->name
);
13740 /* Association is determined by the name of the debug
13741 section containing the name of the code section as
13742 a suffix. For example .debug_line.text.foo is a
13743 debug section associated with .text.foo. */
13744 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13748 if (dsec
->gc_mark
== 0
13749 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13752 dlen
= strlen (dsec
->name
);
13755 && strncmp (dsec
->name
+ (dlen
- ilen
),
13756 isec
->name
, ilen
) == 0)
13761 /* Mark debug sections referenced by kept debug sections. */
13762 if (has_kept_debug_info
)
13763 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13765 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13766 if (!_bfd_elf_gc_mark (info
, isec
,
13767 elf_gc_mark_debug_section
))
13774 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13777 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13779 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13783 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13784 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13785 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13788 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13791 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13793 /* When any section in a section group is kept, we keep all
13794 sections in the section group. If the first member of
13795 the section group is excluded, we will also exclude the
13797 if (o
->flags
& SEC_GROUP
)
13799 asection
*first
= elf_next_in_group (o
);
13800 o
->gc_mark
= first
->gc_mark
;
13806 /* Skip sweeping sections already excluded. */
13807 if (o
->flags
& SEC_EXCLUDE
)
13810 /* Since this is early in the link process, it is simple
13811 to remove a section from the output. */
13812 o
->flags
|= SEC_EXCLUDE
;
13814 if (info
->print_gc_sections
&& o
->size
!= 0)
13815 /* xgettext:c-format */
13816 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13824 /* Propagate collected vtable information. This is called through
13825 elf_link_hash_traverse. */
13828 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13830 /* Those that are not vtables. */
13832 || h
->u2
.vtable
== NULL
13833 || h
->u2
.vtable
->parent
== NULL
)
13836 /* Those vtables that do not have parents, we cannot merge. */
13837 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13840 /* If we've already been done, exit. */
13841 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13844 /* Make sure the parent's table is up to date. */
13845 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13847 if (h
->u2
.vtable
->used
== NULL
)
13849 /* None of this table's entries were referenced. Re-use the
13851 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13852 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13859 /* Or the parent's entries into ours. */
13860 cu
= h
->u2
.vtable
->used
;
13862 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13865 const struct elf_backend_data
*bed
;
13866 unsigned int log_file_align
;
13868 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13869 log_file_align
= bed
->s
->log_file_align
;
13870 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13885 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13888 bfd_vma hstart
, hend
;
13889 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13890 const struct elf_backend_data
*bed
;
13891 unsigned int log_file_align
;
13893 /* Take care of both those symbols that do not describe vtables as
13894 well as those that are not loaded. */
13896 || h
->u2
.vtable
== NULL
13897 || h
->u2
.vtable
->parent
== NULL
)
13900 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13901 || h
->root
.type
== bfd_link_hash_defweak
);
13903 sec
= h
->root
.u
.def
.section
;
13904 hstart
= h
->root
.u
.def
.value
;
13905 hend
= hstart
+ h
->size
;
13907 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, true);
13909 return *(bool *) okp
= false;
13910 bed
= get_elf_backend_data (sec
->owner
);
13911 log_file_align
= bed
->s
->log_file_align
;
13913 relend
= relstart
+ sec
->reloc_count
;
13915 for (rel
= relstart
; rel
< relend
; ++rel
)
13916 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13918 /* If the entry is in use, do nothing. */
13919 if (h
->u2
.vtable
->used
13920 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13922 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13923 if (h
->u2
.vtable
->used
[entry
])
13926 /* Otherwise, kill it. */
13927 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13933 /* Mark sections containing dynamically referenced symbols. When
13934 building shared libraries, we must assume that any visible symbol is
13938 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13940 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13941 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13943 if ((h
->root
.type
== bfd_link_hash_defined
13944 || h
->root
.type
== bfd_link_hash_defweak
)
13946 || h
->root
.ldscript_def
13947 || !info
->start_stop_gc
)
13948 && ((h
->ref_dynamic
&& !h
->forced_local
)
13949 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13950 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13951 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13952 && (!bfd_link_executable (info
)
13953 || info
->gc_keep_exported
13954 || info
->export_dynamic
13957 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13958 && (h
->versioned
>= versioned
13959 || !bfd_hide_sym_by_version (info
->version_info
,
13960 h
->root
.root
.string
)))))
13961 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13966 /* Keep all sections containing symbols undefined on the command-line,
13967 and the section containing the entry symbol. */
13970 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13972 struct bfd_sym_chain
*sym
;
13974 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13976 struct elf_link_hash_entry
*h
;
13978 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13979 false, false, false);
13982 && (h
->root
.type
== bfd_link_hash_defined
13983 || h
->root
.type
== bfd_link_hash_defweak
)
13984 && !bfd_is_const_section (h
->root
.u
.def
.section
))
13985 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13990 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13991 struct bfd_link_info
*info
)
13993 bfd
*ibfd
= info
->input_bfds
;
13995 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13998 struct elf_reloc_cookie cookie
;
14000 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
14002 sec
= ibfd
->sections
;
14003 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14006 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
14009 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
14011 if (startswith (bfd_section_name (sec
), ".eh_frame_entry")
14012 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
14014 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
14015 fini_reloc_cookie_rels (&cookie
, sec
);
14022 /* Do mark and sweep of unused sections. */
14025 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
14029 elf_gc_mark_hook_fn gc_mark_hook
;
14030 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14031 struct elf_link_hash_table
*htab
;
14033 if (!bed
->can_gc_sections
14034 || !is_elf_hash_table (info
->hash
))
14036 _bfd_error_handler(_("warning: gc-sections option ignored"));
14040 bed
->gc_keep (info
);
14041 htab
= elf_hash_table (info
);
14043 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
14044 at the .eh_frame section if we can mark the FDEs individually. */
14045 for (sub
= info
->input_bfds
;
14046 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
14047 sub
= sub
->link
.next
)
14050 struct elf_reloc_cookie cookie
;
14052 sec
= sub
->sections
;
14053 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14055 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
14056 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
14058 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
14059 if (elf_section_data (sec
)->sec_info
14060 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
14061 elf_eh_frame_section (sub
) = sec
;
14062 fini_reloc_cookie_for_section (&cookie
, sec
);
14063 sec
= bfd_get_next_section_by_name (NULL
, sec
);
14067 /* Apply transitive closure to the vtable entry usage info. */
14068 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
14072 /* Kill the vtable relocations that were not used. */
14073 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
14077 /* Mark dynamically referenced symbols. */
14078 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
14079 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
14081 /* Grovel through relocs to find out who stays ... */
14082 gc_mark_hook
= bed
->gc_mark_hook
;
14083 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14087 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14088 || elf_object_id (sub
) != elf_hash_table_id (htab
)
14089 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14093 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14096 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
14097 Also treat note sections as a root, if the section is not part
14098 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
14099 well as FINI_ARRAY sections for ld -r. */
14100 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14102 && (o
->flags
& SEC_EXCLUDE
) == 0
14103 && ((o
->flags
& SEC_KEEP
) != 0
14104 || (bfd_link_relocatable (info
)
14105 && ((elf_section_data (o
)->this_hdr
.sh_type
14106 == SHT_PREINIT_ARRAY
)
14107 || (elf_section_data (o
)->this_hdr
.sh_type
14109 || (elf_section_data (o
)->this_hdr
.sh_type
14110 == SHT_FINI_ARRAY
)))
14111 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
14112 && elf_next_in_group (o
) == NULL
14113 && elf_linked_to_section (o
) == NULL
)
14114 || ((elf_tdata (sub
)->has_gnu_osabi
& elf_gnu_osabi_retain
)
14115 && (elf_section_flags (o
) & SHF_GNU_RETAIN
))))
14117 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
14122 /* Allow the backend to mark additional target specific sections. */
14123 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
14125 /* ... and mark SEC_EXCLUDE for those that go. */
14126 return elf_gc_sweep (abfd
, info
);
14129 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
14132 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
14134 struct elf_link_hash_entry
*h
,
14137 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
14138 struct elf_link_hash_entry
**search
, *child
;
14139 size_t extsymcount
;
14140 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14142 /* The sh_info field of the symtab header tells us where the
14143 external symbols start. We don't care about the local symbols at
14145 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
14146 if (!elf_bad_symtab (abfd
))
14147 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
14149 sym_hashes
= elf_sym_hashes (abfd
);
14150 sym_hashes_end
= sym_hashes
+ extsymcount
;
14152 /* Hunt down the child symbol, which is in this section at the same
14153 offset as the relocation. */
14154 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
14156 if ((child
= *search
) != NULL
14157 && (child
->root
.type
== bfd_link_hash_defined
14158 || child
->root
.type
== bfd_link_hash_defweak
)
14159 && child
->root
.u
.def
.section
== sec
14160 && child
->root
.u
.def
.value
== offset
)
14164 /* xgettext:c-format */
14165 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
14166 abfd
, sec
, (uint64_t) offset
);
14167 bfd_set_error (bfd_error_invalid_operation
);
14171 if (!child
->u2
.vtable
)
14173 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14174 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
14175 if (!child
->u2
.vtable
)
14180 /* This *should* only be the absolute section. It could potentially
14181 be that someone has defined a non-global vtable though, which
14182 would be bad. It isn't worth paging in the local symbols to be
14183 sure though; that case should simply be handled by the assembler. */
14185 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
14188 child
->u2
.vtable
->parent
= h
;
14193 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
14196 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
14197 struct elf_link_hash_entry
*h
,
14200 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14201 unsigned int log_file_align
= bed
->s
->log_file_align
;
14205 /* xgettext:c-format */
14206 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
14208 bfd_set_error (bfd_error_bad_value
);
14214 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14215 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14220 if (addend
>= h
->u2
.vtable
->size
)
14222 size_t size
, bytes
, file_align
;
14223 bool *ptr
= h
->u2
.vtable
->used
;
14225 /* While the symbol is undefined, we have to be prepared to handle
14227 file_align
= 1 << log_file_align
;
14228 if (h
->root
.type
== bfd_link_hash_undefined
)
14229 size
= addend
+ file_align
;
14233 if (addend
>= size
)
14235 /* Oops! We've got a reference past the defined end of
14236 the table. This is probably a bug -- shall we warn? */
14237 size
= addend
+ file_align
;
14240 size
= (size
+ file_align
- 1) & -file_align
;
14242 /* Allocate one extra entry for use as a "done" flag for the
14243 consolidation pass. */
14244 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bool);
14248 ptr
= (bool *) bfd_realloc (ptr
- 1, bytes
);
14254 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14256 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14260 ptr
= (bool *) bfd_zmalloc (bytes
);
14265 /* And arrange for that done flag to be at index -1. */
14266 h
->u2
.vtable
->used
= ptr
+ 1;
14267 h
->u2
.vtable
->size
= size
;
14270 h
->u2
.vtable
->used
[addend
>> log_file_align
] = true;
14275 /* Map an ELF section header flag to its corresponding string. */
14279 flagword flag_value
;
14280 } elf_flags_to_name_table
;
14282 static const elf_flags_to_name_table elf_flags_to_names
[] =
14284 { "SHF_WRITE", SHF_WRITE
},
14285 { "SHF_ALLOC", SHF_ALLOC
},
14286 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14287 { "SHF_MERGE", SHF_MERGE
},
14288 { "SHF_STRINGS", SHF_STRINGS
},
14289 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14290 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14291 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14292 { "SHF_GROUP", SHF_GROUP
},
14293 { "SHF_TLS", SHF_TLS
},
14294 { "SHF_MASKOS", SHF_MASKOS
},
14295 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14298 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14300 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14301 struct flag_info
*flaginfo
,
14304 const bfd_vma sh_flags
= elf_section_flags (section
);
14306 if (!flaginfo
->flags_initialized
)
14308 bfd
*obfd
= info
->output_bfd
;
14309 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14310 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14312 int without_hex
= 0;
14314 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14317 flagword (*lookup
) (char *);
14319 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14320 if (lookup
!= NULL
)
14322 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14326 if (tf
->with
== with_flags
)
14327 with_hex
|= hexval
;
14328 else if (tf
->with
== without_flags
)
14329 without_hex
|= hexval
;
14334 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14336 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14338 if (tf
->with
== with_flags
)
14339 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14340 else if (tf
->with
== without_flags
)
14341 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14348 info
->callbacks
->einfo
14349 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14353 flaginfo
->flags_initialized
= true;
14354 flaginfo
->only_with_flags
|= with_hex
;
14355 flaginfo
->not_with_flags
|= without_hex
;
14358 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14361 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14367 struct alloc_got_off_arg
{
14369 struct bfd_link_info
*info
;
14372 /* We need a special top-level link routine to convert got reference counts
14373 to real got offsets. */
14376 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14378 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14379 bfd
*obfd
= gofarg
->info
->output_bfd
;
14380 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14382 if (h
->got
.refcount
> 0)
14384 h
->got
.offset
= gofarg
->gotoff
;
14385 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14388 h
->got
.offset
= (bfd_vma
) -1;
14393 /* And an accompanying bit to work out final got entry offsets once
14394 we're done. Should be called from final_link. */
14397 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14398 struct bfd_link_info
*info
)
14401 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14403 struct alloc_got_off_arg gofarg
;
14405 BFD_ASSERT (abfd
== info
->output_bfd
);
14407 if (! is_elf_hash_table (info
->hash
))
14410 /* The GOT offset is relative to the .got section, but the GOT header is
14411 put into the .got.plt section, if the backend uses it. */
14412 if (bed
->want_got_plt
)
14415 gotoff
= bed
->got_header_size
;
14417 /* Do the local .got entries first. */
14418 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14420 bfd_signed_vma
*local_got
;
14421 size_t j
, locsymcount
;
14422 Elf_Internal_Shdr
*symtab_hdr
;
14424 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14427 local_got
= elf_local_got_refcounts (i
);
14431 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14432 if (elf_bad_symtab (i
))
14433 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14435 locsymcount
= symtab_hdr
->sh_info
;
14437 for (j
= 0; j
< locsymcount
; ++j
)
14439 if (local_got
[j
] > 0)
14441 local_got
[j
] = gotoff
;
14442 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14445 local_got
[j
] = (bfd_vma
) -1;
14449 /* Then the global .got entries. .plt refcounts are handled by
14450 adjust_dynamic_symbol */
14451 gofarg
.gotoff
= gotoff
;
14452 gofarg
.info
= info
;
14453 elf_link_hash_traverse (elf_hash_table (info
),
14454 elf_gc_allocate_got_offsets
,
14459 /* Many folk need no more in the way of final link than this, once
14460 got entry reference counting is enabled. */
14463 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14465 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14468 /* Invoke the regular ELF backend linker to do all the work. */
14469 return bfd_elf_final_link (abfd
, info
);
14473 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14475 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14477 if (rcookie
->bad_symtab
)
14478 rcookie
->rel
= rcookie
->rels
;
14480 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14482 unsigned long r_symndx
;
14484 if (! rcookie
->bad_symtab
)
14485 if (rcookie
->rel
->r_offset
> offset
)
14487 if (rcookie
->rel
->r_offset
!= offset
)
14490 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14491 if (r_symndx
== STN_UNDEF
)
14494 if (r_symndx
>= rcookie
->locsymcount
14495 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14497 struct elf_link_hash_entry
*h
;
14499 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14501 while (h
->root
.type
== bfd_link_hash_indirect
14502 || h
->root
.type
== bfd_link_hash_warning
)
14503 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14505 if ((h
->root
.type
== bfd_link_hash_defined
14506 || h
->root
.type
== bfd_link_hash_defweak
)
14507 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14508 || h
->root
.u
.def
.section
->kept_section
!= NULL
14509 || discarded_section (h
->root
.u
.def
.section
)))
14514 /* It's not a relocation against a global symbol,
14515 but it could be a relocation against a local
14516 symbol for a discarded section. */
14518 Elf_Internal_Sym
*isym
;
14520 /* Need to: get the symbol; get the section. */
14521 isym
= &rcookie
->locsyms
[r_symndx
];
14522 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14524 && (isec
->kept_section
!= NULL
14525 || discarded_section (isec
)))
14533 /* Discard unneeded references to discarded sections.
14534 Returns -1 on error, 1 if any section's size was changed, 0 if
14535 nothing changed. This function assumes that the relocations are in
14536 sorted order, which is true for all known assemblers. */
14539 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14541 struct elf_reloc_cookie cookie
;
14546 if (info
->traditional_format
14547 || !is_elf_hash_table (info
->hash
))
14550 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14555 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14558 || i
->reloc_count
== 0
14559 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14563 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14566 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14569 if (_bfd_discard_section_stabs (abfd
, i
,
14570 elf_section_data (i
)->sec_info
,
14571 bfd_elf_reloc_symbol_deleted_p
,
14575 fini_reloc_cookie_for_section (&cookie
, i
);
14580 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14581 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14585 int eh_changed
= 0;
14586 unsigned int eh_alignment
; /* Octets. */
14588 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14594 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14597 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14600 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14601 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14602 bfd_elf_reloc_symbol_deleted_p
,
14606 if (i
->size
!= i
->rawsize
)
14610 fini_reloc_cookie_for_section (&cookie
, i
);
14613 eh_alignment
= ((1 << o
->alignment_power
)
14614 * bfd_octets_per_byte (output_bfd
, o
));
14615 /* Skip over zero terminator, and prevent empty sections from
14616 adding alignment padding at the end. */
14617 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14619 i
->flags
|= SEC_EXCLUDE
;
14620 else if (i
->size
> 4)
14622 /* The last non-empty eh_frame section doesn't need padding. */
14625 /* Any prior sections must pad the last FDE out to the output
14626 section alignment. Otherwise we might have zero padding
14627 between sections, which would be seen as a terminator. */
14628 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14630 /* All but the last zero terminator should have been removed. */
14635 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14636 if (i
->size
!= size
)
14644 elf_link_hash_traverse (elf_hash_table (info
),
14645 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14648 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14650 const struct elf_backend_data
*bed
;
14653 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14655 s
= abfd
->sections
;
14656 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14659 bed
= get_elf_backend_data (abfd
);
14661 if (bed
->elf_backend_discard_info
!= NULL
)
14663 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14666 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14669 fini_reloc_cookie (&cookie
, abfd
);
14673 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14674 _bfd_elf_end_eh_frame_parsing (info
);
14676 if (info
->eh_frame_hdr_type
14677 && !bfd_link_relocatable (info
)
14678 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14685 _bfd_elf_section_already_linked (bfd
*abfd
,
14687 struct bfd_link_info
*info
)
14690 const char *name
, *key
;
14691 struct bfd_section_already_linked
*l
;
14692 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14694 if (sec
->output_section
== bfd_abs_section_ptr
)
14697 flags
= sec
->flags
;
14699 /* Return if it isn't a linkonce section. A comdat group section
14700 also has SEC_LINK_ONCE set. */
14701 if ((flags
& SEC_LINK_ONCE
) == 0)
14704 /* Don't put group member sections on our list of already linked
14705 sections. They are handled as a group via their group section. */
14706 if (elf_sec_group (sec
) != NULL
)
14709 /* For a SHT_GROUP section, use the group signature as the key. */
14711 if ((flags
& SEC_GROUP
) != 0
14712 && elf_next_in_group (sec
) != NULL
14713 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14714 key
= elf_group_name (elf_next_in_group (sec
));
14717 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14718 if (startswith (name
, ".gnu.linkonce.")
14719 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14722 /* Must be a user linkonce section that doesn't follow gcc's
14723 naming convention. In this case we won't be matching
14724 single member groups. */
14728 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14730 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14732 /* We may have 2 different types of sections on the list: group
14733 sections with a signature of <key> (<key> is some string),
14734 and linkonce sections named .gnu.linkonce.<type>.<key>.
14735 Match like sections. LTO plugin sections are an exception.
14736 They are always named .gnu.linkonce.t.<key> and match either
14737 type of section. */
14738 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14739 && ((flags
& SEC_GROUP
) != 0
14740 || strcmp (name
, l
->sec
->name
) == 0))
14741 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0
14742 || (sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14744 /* The section has already been linked. See if we should
14745 issue a warning. */
14746 if (!_bfd_handle_already_linked (sec
, l
, info
))
14749 if (flags
& SEC_GROUP
)
14751 asection
*first
= elf_next_in_group (sec
);
14752 asection
*s
= first
;
14756 s
->output_section
= bfd_abs_section_ptr
;
14757 /* Record which group discards it. */
14758 s
->kept_section
= l
->sec
;
14759 s
= elf_next_in_group (s
);
14760 /* These lists are circular. */
14770 /* A single member comdat group section may be discarded by a
14771 linkonce section and vice versa. */
14772 if ((flags
& SEC_GROUP
) != 0)
14774 asection
*first
= elf_next_in_group (sec
);
14776 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14777 /* Check this single member group against linkonce sections. */
14778 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14779 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14780 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14782 first
->output_section
= bfd_abs_section_ptr
;
14783 first
->kept_section
= l
->sec
;
14784 sec
->output_section
= bfd_abs_section_ptr
;
14789 /* Check this linkonce section against single member groups. */
14790 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14791 if (l
->sec
->flags
& SEC_GROUP
)
14793 asection
*first
= elf_next_in_group (l
->sec
);
14796 && elf_next_in_group (first
) == first
14797 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14799 sec
->output_section
= bfd_abs_section_ptr
;
14800 sec
->kept_section
= first
;
14805 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14806 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14807 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14808 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14809 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14810 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14811 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14812 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14813 The reverse order cannot happen as there is never a bfd with only the
14814 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14815 matter as here were are looking only for cross-bfd sections. */
14817 if ((flags
& SEC_GROUP
) == 0 && startswith (name
, ".gnu.linkonce.r."))
14818 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14819 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14820 && startswith (l
->sec
->name
, ".gnu.linkonce.t."))
14822 if (abfd
!= l
->sec
->owner
)
14823 sec
->output_section
= bfd_abs_section_ptr
;
14827 /* This is the first section with this name. Record it. */
14828 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14829 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14830 return sec
->output_section
== bfd_abs_section_ptr
;
14834 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14836 return sym
->st_shndx
== SHN_COMMON
;
14840 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14846 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14848 return bfd_com_section_ptr
;
14852 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14853 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14854 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14855 bfd
*ibfd ATTRIBUTE_UNUSED
,
14856 unsigned long symndx ATTRIBUTE_UNUSED
)
14858 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14859 return bed
->s
->arch_size
/ 8;
14862 /* Routines to support the creation of dynamic relocs. */
14864 /* Returns the name of the dynamic reloc section associated with SEC. */
14866 static const char *
14867 get_dynamic_reloc_section_name (bfd
* abfd
,
14872 const char *old_name
= bfd_section_name (sec
);
14873 const char *prefix
= is_rela
? ".rela" : ".rel";
14875 if (old_name
== NULL
)
14878 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14879 sprintf (name
, "%s%s", prefix
, old_name
);
14884 /* Returns the dynamic reloc section associated with SEC.
14885 If necessary compute the name of the dynamic reloc section based
14886 on SEC's name (looked up in ABFD's string table) and the setting
14890 _bfd_elf_get_dynamic_reloc_section (bfd
*abfd
,
14894 asection
*reloc_sec
= elf_section_data (sec
)->sreloc
;
14896 if (reloc_sec
== NULL
)
14898 const char *name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14902 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14904 if (reloc_sec
!= NULL
)
14905 elf_section_data (sec
)->sreloc
= reloc_sec
;
14912 /* Returns the dynamic reloc section associated with SEC. If the
14913 section does not exist it is created and attached to the DYNOBJ
14914 bfd and stored in the SRELOC field of SEC's elf_section_data
14917 ALIGNMENT is the alignment for the newly created section and
14918 IS_RELA defines whether the name should be .rela.<SEC's name>
14919 or .rel.<SEC's name>. The section name is looked up in the
14920 string table associated with ABFD. */
14923 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14925 unsigned int alignment
,
14929 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14931 if (reloc_sec
== NULL
)
14933 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14938 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14940 if (reloc_sec
== NULL
)
14942 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14943 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14944 if ((sec
->flags
& SEC_ALLOC
) != 0)
14945 flags
|= SEC_ALLOC
| SEC_LOAD
;
14947 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14948 if (reloc_sec
!= NULL
)
14950 /* _bfd_elf_get_sec_type_attr chooses a section type by
14951 name. Override as it may be wrong, eg. for a user
14952 section named "auto" we'll get ".relauto" which is
14953 seen to be a .rela section. */
14954 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14955 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14960 elf_section_data (sec
)->sreloc
= reloc_sec
;
14966 /* Copy the ELF symbol type and other attributes for a linker script
14967 assignment from HSRC to HDEST. Generally this should be treated as
14968 if we found a strong non-dynamic definition for HDEST (except that
14969 ld ignores multiple definition errors). */
14971 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14972 struct bfd_link_hash_entry
*hdest
,
14973 struct bfd_link_hash_entry
*hsrc
)
14975 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14976 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14977 Elf_Internal_Sym isym
;
14979 ehdest
->type
= ehsrc
->type
;
14980 ehdest
->target_internal
= ehsrc
->target_internal
;
14982 isym
.st_other
= ehsrc
->other
;
14983 elf_merge_st_other (abfd
, ehdest
, isym
.st_other
, NULL
, true, false);
14986 /* Append a RELA relocation REL to section S in BFD. */
14989 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14991 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14992 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14993 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14994 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14997 /* Append a REL relocation REL to section S in BFD. */
15000 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
15002 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
15003 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
15004 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
15005 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
15008 /* Define __start, __stop, .startof. or .sizeof. symbol. */
15010 struct bfd_link_hash_entry
*
15011 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
15012 const char *symbol
, asection
*sec
)
15014 struct elf_link_hash_entry
*h
;
15016 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
15017 false, false, true);
15018 /* NB: Common symbols will be turned into definition later. */
15020 && !h
->root
.ldscript_def
15021 && (h
->root
.type
== bfd_link_hash_undefined
15022 || h
->root
.type
== bfd_link_hash_undefweak
15023 || ((h
->ref_regular
|| h
->def_dynamic
)
15025 && h
->root
.type
!= bfd_link_hash_common
)))
15027 bool was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
15028 h
->verinfo
.verdef
= NULL
;
15029 h
->root
.type
= bfd_link_hash_defined
;
15030 h
->root
.u
.def
.section
= sec
;
15031 h
->root
.u
.def
.value
= 0;
15032 h
->def_regular
= 1;
15033 h
->def_dynamic
= 0;
15035 h
->u2
.start_stop_section
= sec
;
15036 if (symbol
[0] == '.')
15038 /* .startof. and .sizeof. symbols are local. */
15039 const struct elf_backend_data
*bed
;
15040 bed
= get_elf_backend_data (info
->output_bfd
);
15041 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
15045 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
15046 h
->other
= ((h
->other
& ~ELF_ST_VISIBILITY (-1))
15047 | info
->start_stop_visibility
);
15049 bfd_elf_link_record_dynamic_symbol (info
, h
);
15056 /* Find dynamic relocs for H that apply to read-only sections. */
15059 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
15061 struct elf_dyn_relocs
*p
;
15063 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
15065 asection
*s
= p
->sec
->output_section
;
15067 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
15073 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
15074 read-only sections. */
15077 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
15081 if (h
->root
.type
== bfd_link_hash_indirect
)
15084 sec
= _bfd_elf_readonly_dynrelocs (h
);
15087 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
15089 info
->flags
|= DF_TEXTREL
;
15090 /* xgettext:c-format */
15091 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
15092 "in read-only section `%pA'\n"),
15093 sec
->owner
, h
->root
.root
.string
, sec
);
15095 if (bfd_link_textrel_check (info
))
15096 /* xgettext:c-format */
15097 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
15098 "in read-only section `%pA'\n"),
15099 sec
->owner
, h
->root
.root
.string
, sec
);
15101 /* Not an error, just cut short the traversal. */
15107 /* Add dynamic tags. */
15110 _bfd_elf_add_dynamic_tags (bfd
*output_bfd
, struct bfd_link_info
*info
,
15111 bool need_dynamic_reloc
)
15113 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
15115 if (htab
->dynamic_sections_created
)
15117 /* Add some entries to the .dynamic section. We fill in the
15118 values later, in finish_dynamic_sections, but we must add
15119 the entries now so that we get the correct size for the
15120 .dynamic section. The DT_DEBUG entry is filled in by the
15121 dynamic linker and used by the debugger. */
15122 #define add_dynamic_entry(TAG, VAL) \
15123 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
15125 const struct elf_backend_data
*bed
15126 = get_elf_backend_data (output_bfd
);
15128 if (bfd_link_executable (info
))
15130 if (!add_dynamic_entry (DT_DEBUG
, 0))
15134 if (htab
->dt_pltgot_required
|| htab
->splt
->size
!= 0)
15136 /* DT_PLTGOT is used by prelink even if there is no PLT
15138 if (!add_dynamic_entry (DT_PLTGOT
, 0))
15142 if (htab
->dt_jmprel_required
|| htab
->srelplt
->size
!= 0)
15144 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
15145 || !add_dynamic_entry (DT_PLTREL
,
15146 (bed
->rela_plts_and_copies_p
15147 ? DT_RELA
: DT_REL
))
15148 || !add_dynamic_entry (DT_JMPREL
, 0))
15152 if (htab
->tlsdesc_plt
15153 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
15154 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
15157 if (need_dynamic_reloc
)
15159 if (bed
->rela_plts_and_copies_p
)
15161 if (!add_dynamic_entry (DT_RELA
, 0)
15162 || !add_dynamic_entry (DT_RELASZ
, 0)
15163 || !add_dynamic_entry (DT_RELAENT
,
15164 bed
->s
->sizeof_rela
))
15169 if (!add_dynamic_entry (DT_REL
, 0)
15170 || !add_dynamic_entry (DT_RELSZ
, 0)
15171 || !add_dynamic_entry (DT_RELENT
,
15172 bed
->s
->sizeof_rel
))
15176 /* If any dynamic relocs apply to a read-only section,
15177 then we need a DT_TEXTREL entry. */
15178 if ((info
->flags
& DF_TEXTREL
) == 0)
15179 elf_link_hash_traverse (htab
, _bfd_elf_maybe_set_textrel
,
15182 if ((info
->flags
& DF_TEXTREL
) != 0)
15184 if (htab
->ifunc_resolvers
)
15185 info
->callbacks
->einfo
15186 (_("%P: warning: GNU indirect functions with DT_TEXTREL "
15187 "may result in a segfault at runtime; recompile with %s\n"),
15188 bfd_link_dll (info
) ? "-fPIC" : "-fPIE");
15190 if (!add_dynamic_entry (DT_TEXTREL
, 0))
15195 #undef add_dynamic_entry