1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2020 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"
35 /* This struct is used to pass information to routines called via
36 elf_link_hash_traverse which must return failure. */
38 struct elf_info_failed
40 struct bfd_link_info
*info
;
44 /* This structure is used to pass information to
45 _bfd_elf_link_find_version_dependencies. */
47 struct elf_find_verdep_info
49 /* General link information. */
50 struct bfd_link_info
*info
;
51 /* The number of dependencies. */
53 /* Whether we had a failure. */
57 static bfd_boolean _bfd_elf_fix_symbol_flags
58 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
61 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
62 unsigned long r_symndx
,
65 if (r_symndx
>= cookie
->locsymcount
66 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
68 struct elf_link_hash_entry
*h
;
70 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
72 while (h
->root
.type
== bfd_link_hash_indirect
73 || h
->root
.type
== bfd_link_hash_warning
)
74 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
76 if ((h
->root
.type
== bfd_link_hash_defined
77 || h
->root
.type
== bfd_link_hash_defweak
)
78 && discarded_section (h
->root
.u
.def
.section
))
79 return h
->root
.u
.def
.section
;
85 /* It's not a relocation against a global symbol,
86 but it could be a relocation against a local
87 symbol for a discarded section. */
89 Elf_Internal_Sym
*isym
;
91 /* Need to: get the symbol; get the section. */
92 isym
= &cookie
->locsyms
[r_symndx
];
93 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
95 && discard
? discarded_section (isec
) : 1)
101 /* Define a symbol in a dynamic linkage section. */
103 struct elf_link_hash_entry
*
104 _bfd_elf_define_linkage_sym (bfd
*abfd
,
105 struct bfd_link_info
*info
,
109 struct elf_link_hash_entry
*h
;
110 struct bfd_link_hash_entry
*bh
;
111 const struct elf_backend_data
*bed
;
113 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
116 /* Zap symbol defined in an as-needed lib that wasn't linked.
117 This is a symptom of a larger problem: Absolute symbols
118 defined in shared libraries can't be overridden, because we
119 lose the link to the bfd which is via the symbol section. */
120 h
->root
.type
= bfd_link_hash_new
;
126 bed
= get_elf_backend_data (abfd
);
127 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
128 sec
, 0, NULL
, FALSE
, bed
->collect
,
131 h
= (struct elf_link_hash_entry
*) bh
;
132 BFD_ASSERT (h
!= NULL
);
135 h
->root
.linker_def
= 1;
136 h
->type
= STT_OBJECT
;
137 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
138 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
140 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
145 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
149 struct elf_link_hash_entry
*h
;
150 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
151 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
153 /* This function may be called more than once. */
154 if (htab
->sgot
!= NULL
)
157 flags
= bed
->dynamic_sec_flags
;
159 s
= bfd_make_section_anyway_with_flags (abfd
,
160 (bed
->rela_plts_and_copies_p
161 ? ".rela.got" : ".rel.got"),
162 (bed
->dynamic_sec_flags
165 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
169 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
171 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
175 if (bed
->want_got_plt
)
177 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
179 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
184 /* The first bit of the global offset table is the header. */
185 s
->size
+= bed
->got_header_size
;
187 if (bed
->want_got_sym
)
189 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
190 (or .got.plt) section. We don't do this in the linker script
191 because we don't want to define the symbol if we are not creating
192 a global offset table. */
193 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
194 "_GLOBAL_OFFSET_TABLE_");
195 elf_hash_table (info
)->hgot
= h
;
203 /* Create a strtab to hold the dynamic symbol names. */
205 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
207 struct elf_link_hash_table
*hash_table
;
209 hash_table
= elf_hash_table (info
);
210 if (hash_table
->dynobj
== NULL
)
212 /* We may not set dynobj, an input file holding linker created
213 dynamic sections to abfd, which may be a dynamic object with
214 its own dynamic sections. We need to find a normal input file
215 to hold linker created sections if possible. */
216 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
220 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
222 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
223 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
224 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
225 && !((s
= ibfd
->sections
) != NULL
226 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
232 hash_table
->dynobj
= abfd
;
235 if (hash_table
->dynstr
== NULL
)
237 hash_table
->dynstr
= _bfd_elf_strtab_init ();
238 if (hash_table
->dynstr
== NULL
)
244 /* Create some sections which will be filled in with dynamic linking
245 information. ABFD is an input file which requires dynamic sections
246 to be created. The dynamic sections take up virtual memory space
247 when the final executable is run, so we need to create them before
248 addresses are assigned to the output sections. We work out the
249 actual contents and size of these sections later. */
252 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
256 const struct elf_backend_data
*bed
;
257 struct elf_link_hash_entry
*h
;
259 if (! is_elf_hash_table (info
->hash
))
262 if (elf_hash_table (info
)->dynamic_sections_created
)
265 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
268 abfd
= elf_hash_table (info
)->dynobj
;
269 bed
= get_elf_backend_data (abfd
);
271 flags
= bed
->dynamic_sec_flags
;
273 /* A dynamically linked executable has a .interp section, but a
274 shared library does not. */
275 if (bfd_link_executable (info
) && !info
->nointerp
)
277 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
278 flags
| SEC_READONLY
);
283 /* Create sections to hold version informations. These are removed
284 if they are not needed. */
285 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
286 flags
| SEC_READONLY
);
288 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
291 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
292 flags
| SEC_READONLY
);
294 || !bfd_set_section_alignment (s
, 1))
297 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
298 flags
| SEC_READONLY
);
300 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
303 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
304 flags
| SEC_READONLY
);
306 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
308 elf_hash_table (info
)->dynsym
= s
;
310 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
311 flags
| SEC_READONLY
);
315 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
317 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
320 /* The special symbol _DYNAMIC is always set to the start of the
321 .dynamic section. We could set _DYNAMIC in a linker script, but we
322 only want to define it if we are, in fact, creating a .dynamic
323 section. We don't want to define it if there is no .dynamic
324 section, since on some ELF platforms the start up code examines it
325 to decide how to initialize the process. */
326 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
327 elf_hash_table (info
)->hdynamic
= h
;
333 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
334 flags
| SEC_READONLY
);
336 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
338 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
341 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
343 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
344 flags
| SEC_READONLY
);
346 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
348 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
349 4 32-bit words followed by variable count of 64-bit words, then
350 variable count of 32-bit words. */
351 if (bed
->s
->arch_size
== 64)
352 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
354 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
357 /* Let the backend create the rest of the sections. This lets the
358 backend set the right flags. The backend will normally create
359 the .got and .plt sections. */
360 if (bed
->elf_backend_create_dynamic_sections
== NULL
361 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
364 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
369 /* Create dynamic sections when linking against a dynamic object. */
372 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
374 flagword flags
, pltflags
;
375 struct elf_link_hash_entry
*h
;
377 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
378 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
380 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
381 .rel[a].bss sections. */
382 flags
= bed
->dynamic_sec_flags
;
385 if (bed
->plt_not_loaded
)
386 /* We do not clear SEC_ALLOC here because we still want the OS to
387 allocate space for the section; it's just that there's nothing
388 to read in from the object file. */
389 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
391 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
392 if (bed
->plt_readonly
)
393 pltflags
|= SEC_READONLY
;
395 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
397 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
401 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
403 if (bed
->want_plt_sym
)
405 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
406 "_PROCEDURE_LINKAGE_TABLE_");
407 elf_hash_table (info
)->hplt
= h
;
412 s
= bfd_make_section_anyway_with_flags (abfd
,
413 (bed
->rela_plts_and_copies_p
414 ? ".rela.plt" : ".rel.plt"),
415 flags
| SEC_READONLY
);
417 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
421 if (! _bfd_elf_create_got_section (abfd
, info
))
424 if (bed
->want_dynbss
)
426 /* The .dynbss section is a place to put symbols which are defined
427 by dynamic objects, are referenced by regular objects, and are
428 not functions. We must allocate space for them in the process
429 image and use a R_*_COPY reloc to tell the dynamic linker to
430 initialize them at run time. The linker script puts the .dynbss
431 section into the .bss section of the final image. */
432 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
433 SEC_ALLOC
| SEC_LINKER_CREATED
);
438 if (bed
->want_dynrelro
)
440 /* Similarly, but for symbols that were originally in read-only
441 sections. This section doesn't really need to have contents,
442 but make it like other .data.rel.ro sections. */
443 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
450 /* The .rel[a].bss section holds copy relocs. This section is not
451 normally needed. We need to create it here, though, so that the
452 linker will map it to an output section. We can't just create it
453 only if we need it, because we will not know whether we need it
454 until we have seen all the input files, and the first time the
455 main linker code calls BFD after examining all the input files
456 (size_dynamic_sections) the input sections have already been
457 mapped to the output sections. If the section turns out not to
458 be needed, we can discard it later. We will never need this
459 section when generating a shared object, since they do not use
461 if (bfd_link_executable (info
))
463 s
= bfd_make_section_anyway_with_flags (abfd
,
464 (bed
->rela_plts_and_copies_p
465 ? ".rela.bss" : ".rel.bss"),
466 flags
| SEC_READONLY
);
468 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
472 if (bed
->want_dynrelro
)
474 s
= (bfd_make_section_anyway_with_flags
475 (abfd
, (bed
->rela_plts_and_copies_p
476 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
477 flags
| SEC_READONLY
));
479 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
481 htab
->sreldynrelro
= s
;
489 /* Record a new dynamic symbol. We record the dynamic symbols as we
490 read the input files, since we need to have a list of all of them
491 before we can determine the final sizes of the output sections.
492 Note that we may actually call this function even though we are not
493 going to output any dynamic symbols; in some cases we know that a
494 symbol should be in the dynamic symbol table, but only if there is
498 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
499 struct elf_link_hash_entry
*h
)
501 if (h
->dynindx
== -1)
503 struct elf_strtab_hash
*dynstr
;
508 /* XXX: The ABI draft says the linker must turn hidden and
509 internal symbols into STB_LOCAL symbols when producing the
510 DSO. However, if ld.so honors st_other in the dynamic table,
511 this would not be necessary. */
512 switch (ELF_ST_VISIBILITY (h
->other
))
516 if (h
->root
.type
!= bfd_link_hash_undefined
517 && h
->root
.type
!= bfd_link_hash_undefweak
)
520 if (!elf_hash_table (info
)->is_relocatable_executable
)
528 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
529 ++elf_hash_table (info
)->dynsymcount
;
531 dynstr
= elf_hash_table (info
)->dynstr
;
534 /* Create a strtab to hold the dynamic symbol names. */
535 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
540 /* We don't put any version information in the dynamic string
542 name
= h
->root
.root
.string
;
543 p
= strchr (name
, ELF_VER_CHR
);
545 /* We know that the p points into writable memory. In fact,
546 there are only a few symbols that have read-only names, being
547 those like _GLOBAL_OFFSET_TABLE_ that are created specially
548 by the backends. Most symbols will have names pointing into
549 an ELF string table read from a file, or to objalloc memory. */
552 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
557 if (indx
== (size_t) -1)
559 h
->dynstr_index
= indx
;
565 /* Mark a symbol dynamic. */
568 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
569 struct elf_link_hash_entry
*h
,
570 Elf_Internal_Sym
*sym
)
572 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
574 /* It may be called more than once on the same H. */
575 if(h
->dynamic
|| bfd_link_relocatable (info
))
578 if ((info
->dynamic_data
579 && (h
->type
== STT_OBJECT
580 || h
->type
== STT_COMMON
582 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
583 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
586 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
589 /* NB: If a symbol is made dynamic by --dynamic-list, it has
591 h
->root
.non_ir_ref_dynamic
= 1;
595 /* Record an assignment to a symbol made by a linker script. We need
596 this in case some dynamic object refers to this symbol. */
599 bfd_elf_record_link_assignment (bfd
*output_bfd
,
600 struct bfd_link_info
*info
,
605 struct elf_link_hash_entry
*h
, *hv
;
606 struct elf_link_hash_table
*htab
;
607 const struct elf_backend_data
*bed
;
609 if (!is_elf_hash_table (info
->hash
))
612 htab
= elf_hash_table (info
);
613 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
617 if (h
->root
.type
== bfd_link_hash_warning
)
618 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
620 if (h
->versioned
== unknown
)
622 /* Set versioned if symbol version is unknown. */
623 char *version
= strrchr (name
, ELF_VER_CHR
);
626 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
627 h
->versioned
= versioned_hidden
;
629 h
->versioned
= versioned
;
633 /* Symbols defined in a linker script but not referenced anywhere
634 else will have non_elf set. */
637 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
641 switch (h
->root
.type
)
643 case bfd_link_hash_defined
:
644 case bfd_link_hash_defweak
:
645 case bfd_link_hash_common
:
647 case bfd_link_hash_undefweak
:
648 case bfd_link_hash_undefined
:
649 /* Since we're defining the symbol, don't let it seem to have not
650 been defined. record_dynamic_symbol and size_dynamic_sections
651 may depend on this. */
652 h
->root
.type
= bfd_link_hash_new
;
653 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
654 bfd_link_repair_undef_list (&htab
->root
);
656 case bfd_link_hash_new
:
658 case bfd_link_hash_indirect
:
659 /* We had a versioned symbol in a dynamic library. We make the
660 the versioned symbol point to this one. */
661 bed
= get_elf_backend_data (output_bfd
);
663 while (hv
->root
.type
== bfd_link_hash_indirect
664 || hv
->root
.type
== bfd_link_hash_warning
)
665 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
666 /* We don't need to update h->root.u since linker will set them
668 h
->root
.type
= bfd_link_hash_undefined
;
669 hv
->root
.type
= bfd_link_hash_indirect
;
670 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
671 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
678 /* If this symbol is being provided by the linker script, and it is
679 currently defined by a dynamic object, but not by a regular
680 object, then mark it as undefined so that the generic linker will
681 force the correct value. */
685 h
->root
.type
= bfd_link_hash_undefined
;
687 /* If this symbol is currently defined by a dynamic object, but not
688 by a regular object, then clear out any version information because
689 the symbol will not be associated with the dynamic object any
691 if (h
->def_dynamic
&& !h
->def_regular
)
692 h
->verinfo
.verdef
= NULL
;
694 /* Make sure this symbol is not garbage collected. */
701 bed
= get_elf_backend_data (output_bfd
);
702 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
703 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
704 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
707 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
709 if (!bfd_link_relocatable (info
)
711 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
712 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
717 || bfd_link_dll (info
)
718 || elf_hash_table (info
)->is_relocatable_executable
)
722 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
725 /* If this is a weak defined symbol, and we know a corresponding
726 real symbol from the same dynamic object, make sure the real
727 symbol is also made into a dynamic symbol. */
730 struct elf_link_hash_entry
*def
= weakdef (h
);
732 if (def
->dynindx
== -1
733 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
741 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
742 success, and 2 on a failure caused by attempting to record a symbol
743 in a discarded section, eg. a discarded link-once section symbol. */
746 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
751 struct elf_link_local_dynamic_entry
*entry
;
752 struct elf_link_hash_table
*eht
;
753 struct elf_strtab_hash
*dynstr
;
756 Elf_External_Sym_Shndx eshndx
;
757 char esym
[sizeof (Elf64_External_Sym
)];
759 if (! is_elf_hash_table (info
->hash
))
762 /* See if the entry exists already. */
763 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
764 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
767 amt
= sizeof (*entry
);
768 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
772 /* Go find the symbol, so that we can find it's name. */
773 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
774 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
776 bfd_release (input_bfd
, entry
);
780 if (entry
->isym
.st_shndx
!= SHN_UNDEF
781 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
785 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
786 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
788 /* We can still bfd_release here as nothing has done another
789 bfd_alloc. We can't do this later in this function. */
790 bfd_release (input_bfd
, entry
);
795 name
= (bfd_elf_string_from_elf_section
796 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
797 entry
->isym
.st_name
));
799 dynstr
= elf_hash_table (info
)->dynstr
;
802 /* Create a strtab to hold the dynamic symbol names. */
803 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
808 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
809 if (dynstr_index
== (size_t) -1)
811 entry
->isym
.st_name
= dynstr_index
;
813 eht
= elf_hash_table (info
);
815 entry
->next
= eht
->dynlocal
;
816 eht
->dynlocal
= entry
;
817 entry
->input_bfd
= input_bfd
;
818 entry
->input_indx
= input_indx
;
821 /* Whatever binding the symbol had before, it's now local. */
823 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
825 /* The dynindx will be set at the end of size_dynamic_sections. */
830 /* Return the dynindex of a local dynamic symbol. */
833 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
837 struct elf_link_local_dynamic_entry
*e
;
839 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
840 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
845 /* This function is used to renumber the dynamic symbols, if some of
846 them are removed because they are marked as local. This is called
847 via elf_link_hash_traverse. */
850 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
853 size_t *count
= (size_t *) data
;
858 if (h
->dynindx
!= -1)
859 h
->dynindx
= ++(*count
);
865 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
866 STB_LOCAL binding. */
869 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
872 size_t *count
= (size_t *) data
;
874 if (!h
->forced_local
)
877 if (h
->dynindx
!= -1)
878 h
->dynindx
= ++(*count
);
883 /* Return true if the dynamic symbol for a given section should be
884 omitted when creating a shared library. */
886 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
887 struct bfd_link_info
*info
,
890 struct elf_link_hash_table
*htab
;
893 switch (elf_section_data (p
)->this_hdr
.sh_type
)
897 /* If sh_type is yet undecided, assume it could be
898 SHT_PROGBITS/SHT_NOBITS. */
900 htab
= elf_hash_table (info
);
901 if (htab
->text_index_section
!= NULL
)
902 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
904 return (htab
->dynobj
!= NULL
905 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
906 && ip
->output_section
== p
);
908 /* There shouldn't be section relative relocations
909 against any other section. */
916 _bfd_elf_omit_section_dynsym_all
917 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
918 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
919 asection
*p ATTRIBUTE_UNUSED
)
924 /* Assign dynsym indices. In a shared library we generate a section
925 symbol for each output section, which come first. Next come symbols
926 which have been forced to local binding. Then all of the back-end
927 allocated local dynamic syms, followed by the rest of the global
928 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
929 (This prevents the early call before elf_backend_init_index_section
930 and strip_excluded_output_sections setting dynindx for sections
931 that are stripped.) */
934 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
935 struct bfd_link_info
*info
,
936 unsigned long *section_sym_count
)
938 unsigned long dynsymcount
= 0;
939 bfd_boolean do_sec
= section_sym_count
!= NULL
;
941 if (bfd_link_pic (info
)
942 || elf_hash_table (info
)->is_relocatable_executable
)
944 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
946 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
947 if ((p
->flags
& SEC_EXCLUDE
) == 0
948 && (p
->flags
& SEC_ALLOC
) != 0
949 && elf_hash_table (info
)->dynamic_relocs
950 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
954 elf_section_data (p
)->dynindx
= dynsymcount
;
957 elf_section_data (p
)->dynindx
= 0;
960 *section_sym_count
= dynsymcount
;
962 elf_link_hash_traverse (elf_hash_table (info
),
963 elf_link_renumber_local_hash_table_dynsyms
,
966 if (elf_hash_table (info
)->dynlocal
)
968 struct elf_link_local_dynamic_entry
*p
;
969 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
970 p
->dynindx
= ++dynsymcount
;
972 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
974 elf_link_hash_traverse (elf_hash_table (info
),
975 elf_link_renumber_hash_table_dynsyms
,
978 /* There is an unused NULL entry at the head of the table which we
979 must account for in our count even if the table is empty since it
980 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
984 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
988 /* Merge st_other field. */
991 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
992 const Elf_Internal_Sym
*isym
, asection
*sec
,
993 bfd_boolean definition
, bfd_boolean dynamic
)
995 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
997 /* If st_other has a processor-specific meaning, specific
998 code might be needed here. */
999 if (bed
->elf_backend_merge_symbol_attribute
)
1000 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
1005 unsigned symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
1006 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1008 /* Keep the most constraining visibility. Leave the remainder
1009 of the st_other field to elf_backend_merge_symbol_attribute. */
1010 if (symvis
- 1 < hvis
- 1)
1011 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1014 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_DEFAULT
1015 && (sec
->flags
& SEC_READONLY
) == 0)
1016 h
->protected_def
= 1;
1019 /* This function is called when we want to merge a new symbol with an
1020 existing symbol. It handles the various cases which arise when we
1021 find a definition in a dynamic object, or when there is already a
1022 definition in a dynamic object. The new symbol is described by
1023 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1024 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1025 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1026 of an old common symbol. We set OVERRIDE if the old symbol is
1027 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1028 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1029 to change. By OK to change, we mean that we shouldn't warn if the
1030 type or size does change. */
1033 _bfd_elf_merge_symbol (bfd
*abfd
,
1034 struct bfd_link_info
*info
,
1036 Elf_Internal_Sym
*sym
,
1039 struct elf_link_hash_entry
**sym_hash
,
1041 bfd_boolean
*pold_weak
,
1042 unsigned int *pold_alignment
,
1044 bfd_boolean
*override
,
1045 bfd_boolean
*type_change_ok
,
1046 bfd_boolean
*size_change_ok
,
1047 bfd_boolean
*matched
)
1049 asection
*sec
, *oldsec
;
1050 struct elf_link_hash_entry
*h
;
1051 struct elf_link_hash_entry
*hi
;
1052 struct elf_link_hash_entry
*flip
;
1055 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1056 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
1057 const struct elf_backend_data
*bed
;
1059 bfd_boolean default_sym
= *matched
;
1065 bind
= ELF_ST_BIND (sym
->st_info
);
1067 if (! bfd_is_und_section (sec
))
1068 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
1070 h
= ((struct elf_link_hash_entry
*)
1071 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
1076 bed
= get_elf_backend_data (abfd
);
1078 /* NEW_VERSION is the symbol version of the new symbol. */
1079 if (h
->versioned
!= unversioned
)
1081 /* Symbol version is unknown or versioned. */
1082 new_version
= strrchr (name
, ELF_VER_CHR
);
1085 if (h
->versioned
== unknown
)
1087 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1088 h
->versioned
= versioned_hidden
;
1090 h
->versioned
= versioned
;
1093 if (new_version
[0] == '\0')
1097 h
->versioned
= unversioned
;
1102 /* For merging, we only care about real symbols. But we need to make
1103 sure that indirect symbol dynamic flags are updated. */
1105 while (h
->root
.type
== bfd_link_hash_indirect
1106 || h
->root
.type
== bfd_link_hash_warning
)
1107 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1111 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1115 /* OLD_HIDDEN is true if the existing symbol is only visible
1116 to the symbol with the same symbol version. NEW_HIDDEN is
1117 true if the new symbol is only visible to the symbol with
1118 the same symbol version. */
1119 bfd_boolean old_hidden
= h
->versioned
== versioned_hidden
;
1120 bfd_boolean new_hidden
= hi
->versioned
== versioned_hidden
;
1121 if (!old_hidden
&& !new_hidden
)
1122 /* The new symbol matches the existing symbol if both
1127 /* OLD_VERSION is the symbol version of the existing
1131 if (h
->versioned
>= versioned
)
1132 old_version
= strrchr (h
->root
.root
.string
,
1137 /* The new symbol matches the existing symbol if they
1138 have the same symbol version. */
1139 *matched
= (old_version
== new_version
1140 || (old_version
!= NULL
1141 && new_version
!= NULL
1142 && strcmp (old_version
, new_version
) == 0));
1147 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1152 switch (h
->root
.type
)
1157 case bfd_link_hash_undefined
:
1158 case bfd_link_hash_undefweak
:
1159 oldbfd
= h
->root
.u
.undef
.abfd
;
1162 case bfd_link_hash_defined
:
1163 case bfd_link_hash_defweak
:
1164 oldbfd
= h
->root
.u
.def
.section
->owner
;
1165 oldsec
= h
->root
.u
.def
.section
;
1168 case bfd_link_hash_common
:
1169 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1170 oldsec
= h
->root
.u
.c
.p
->section
;
1172 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1175 if (poldbfd
&& *poldbfd
== NULL
)
1178 /* Differentiate strong and weak symbols. */
1179 newweak
= bind
== STB_WEAK
;
1180 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1181 || h
->root
.type
== bfd_link_hash_undefweak
);
1183 *pold_weak
= oldweak
;
1185 /* We have to check it for every instance since the first few may be
1186 references and not all compilers emit symbol type for undefined
1188 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1190 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1191 respectively, is from a dynamic object. */
1193 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1195 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1196 syms and defined syms in dynamic libraries respectively.
1197 ref_dynamic on the other hand can be set for a symbol defined in
1198 a dynamic library, and def_dynamic may not be set; When the
1199 definition in a dynamic lib is overridden by a definition in the
1200 executable use of the symbol in the dynamic lib becomes a
1201 reference to the executable symbol. */
1204 if (bfd_is_und_section (sec
))
1206 if (bind
!= STB_WEAK
)
1208 h
->ref_dynamic_nonweak
= 1;
1209 hi
->ref_dynamic_nonweak
= 1;
1214 /* Update the existing symbol only if they match. */
1217 hi
->dynamic_def
= 1;
1221 /* If we just created the symbol, mark it as being an ELF symbol.
1222 Other than that, there is nothing to do--there is no merge issue
1223 with a newly defined symbol--so we just return. */
1225 if (h
->root
.type
== bfd_link_hash_new
)
1231 /* In cases involving weak versioned symbols, we may wind up trying
1232 to merge a symbol with itself. Catch that here, to avoid the
1233 confusion that results if we try to override a symbol with
1234 itself. The additional tests catch cases like
1235 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1236 dynamic object, which we do want to handle here. */
1238 && (newweak
|| oldweak
)
1239 && ((abfd
->flags
& DYNAMIC
) == 0
1240 || !h
->def_regular
))
1245 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1246 else if (oldsec
!= NULL
)
1248 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1249 indices used by MIPS ELF. */
1250 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1253 /* Handle a case where plugin_notice won't be called and thus won't
1254 set the non_ir_ref flags on the first pass over symbols. */
1256 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
)
1257 && newdyn
!= olddyn
)
1259 h
->root
.non_ir_ref_dynamic
= TRUE
;
1260 hi
->root
.non_ir_ref_dynamic
= TRUE
;
1263 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1264 respectively, appear to be a definition rather than reference. */
1266 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1268 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1269 && h
->root
.type
!= bfd_link_hash_undefweak
1270 && h
->root
.type
!= bfd_link_hash_common
);
1272 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1273 respectively, appear to be a function. */
1275 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1276 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1278 oldfunc
= (h
->type
!= STT_NOTYPE
1279 && bed
->is_function_type (h
->type
));
1281 if (!(newfunc
&& oldfunc
)
1282 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1283 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1284 && h
->type
!= STT_NOTYPE
1285 && (newdef
|| bfd_is_com_section (sec
))
1286 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1288 /* If creating a default indirect symbol ("foo" or "foo@") from
1289 a dynamic versioned definition ("foo@@") skip doing so if
1290 there is an existing regular definition with a different
1291 type. We don't want, for example, a "time" variable in the
1292 executable overriding a "time" function in a shared library. */
1300 /* When adding a symbol from a regular object file after we have
1301 created indirect symbols, undo the indirection and any
1308 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1309 h
->forced_local
= 0;
1313 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1315 h
->root
.type
= bfd_link_hash_undefined
;
1316 h
->root
.u
.undef
.abfd
= abfd
;
1320 h
->root
.type
= bfd_link_hash_new
;
1321 h
->root
.u
.undef
.abfd
= NULL
;
1327 /* Check TLS symbols. We don't check undefined symbols introduced
1328 by "ld -u" which have no type (and oldbfd NULL), and we don't
1329 check symbols from plugins because they also have no type. */
1331 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1332 && (abfd
->flags
& BFD_PLUGIN
) == 0
1333 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1334 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1337 bfd_boolean ntdef
, tdef
;
1338 asection
*ntsec
, *tsec
;
1340 if (h
->type
== STT_TLS
)
1361 /* xgettext:c-format */
1362 (_("%s: TLS definition in %pB section %pA "
1363 "mismatches non-TLS definition in %pB section %pA"),
1364 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1365 else if (!tdef
&& !ntdef
)
1367 /* xgettext:c-format */
1368 (_("%s: TLS reference in %pB "
1369 "mismatches non-TLS reference in %pB"),
1370 h
->root
.root
.string
, tbfd
, ntbfd
);
1373 /* xgettext:c-format */
1374 (_("%s: TLS definition in %pB section %pA "
1375 "mismatches non-TLS reference in %pB"),
1376 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1379 /* xgettext:c-format */
1380 (_("%s: TLS reference in %pB "
1381 "mismatches non-TLS definition in %pB section %pA"),
1382 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1384 bfd_set_error (bfd_error_bad_value
);
1388 /* If the old symbol has non-default visibility, we ignore the new
1389 definition from a dynamic object. */
1391 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1392 && !bfd_is_und_section (sec
))
1395 /* Make sure this symbol is dynamic. */
1397 hi
->ref_dynamic
= 1;
1398 /* A protected symbol has external availability. Make sure it is
1399 recorded as dynamic.
1401 FIXME: Should we check type and size for protected symbol? */
1402 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1403 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1408 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1411 /* If the new symbol with non-default visibility comes from a
1412 relocatable file and the old definition comes from a dynamic
1413 object, we remove the old definition. */
1414 if (hi
->root
.type
== bfd_link_hash_indirect
)
1416 /* Handle the case where the old dynamic definition is
1417 default versioned. We need to copy the symbol info from
1418 the symbol with default version to the normal one if it
1419 was referenced before. */
1422 hi
->root
.type
= h
->root
.type
;
1423 h
->root
.type
= bfd_link_hash_indirect
;
1424 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1426 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1427 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1429 /* If the new symbol is hidden or internal, completely undo
1430 any dynamic link state. */
1431 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1432 h
->forced_local
= 0;
1439 /* FIXME: Should we check type and size for protected symbol? */
1449 /* If the old symbol was undefined before, then it will still be
1450 on the undefs list. If the new symbol is undefined or
1451 common, we can't make it bfd_link_hash_new here, because new
1452 undefined or common symbols will be added to the undefs list
1453 by _bfd_generic_link_add_one_symbol. Symbols may not be
1454 added twice to the undefs list. Also, if the new symbol is
1455 undefweak then we don't want to lose the strong undef. */
1456 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1458 h
->root
.type
= bfd_link_hash_undefined
;
1459 h
->root
.u
.undef
.abfd
= abfd
;
1463 h
->root
.type
= bfd_link_hash_new
;
1464 h
->root
.u
.undef
.abfd
= NULL
;
1467 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1469 /* If the new symbol is hidden or internal, completely undo
1470 any dynamic link state. */
1471 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1472 h
->forced_local
= 0;
1478 /* FIXME: Should we check type and size for protected symbol? */
1484 /* If a new weak symbol definition comes from a regular file and the
1485 old symbol comes from a dynamic library, we treat the new one as
1486 strong. Similarly, an old weak symbol definition from a regular
1487 file is treated as strong when the new symbol comes from a dynamic
1488 library. Further, an old weak symbol from a dynamic library is
1489 treated as strong if the new symbol is from a dynamic library.
1490 This reflects the way glibc's ld.so works.
1492 Also allow a weak symbol to override a linker script symbol
1493 defined by an early pass over the script. This is done so the
1494 linker knows the symbol is defined in an object file, for the
1495 DEFINED script function.
1497 Do this before setting *type_change_ok or *size_change_ok so that
1498 we warn properly when dynamic library symbols are overridden. */
1500 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1502 if (olddef
&& newdyn
)
1505 /* Allow changes between different types of function symbol. */
1506 if (newfunc
&& oldfunc
)
1507 *type_change_ok
= TRUE
;
1509 /* It's OK to change the type if either the existing symbol or the
1510 new symbol is weak. A type change is also OK if the old symbol
1511 is undefined and the new symbol is defined. */
1516 && h
->root
.type
== bfd_link_hash_undefined
))
1517 *type_change_ok
= TRUE
;
1519 /* It's OK to change the size if either the existing symbol or the
1520 new symbol is weak, or if the old symbol is undefined. */
1523 || h
->root
.type
== bfd_link_hash_undefined
)
1524 *size_change_ok
= TRUE
;
1526 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1527 symbol, respectively, appears to be a common symbol in a dynamic
1528 object. If a symbol appears in an uninitialized section, and is
1529 not weak, and is not a function, then it may be a common symbol
1530 which was resolved when the dynamic object was created. We want
1531 to treat such symbols specially, because they raise special
1532 considerations when setting the symbol size: if the symbol
1533 appears as a common symbol in a regular object, and the size in
1534 the regular object is larger, we must make sure that we use the
1535 larger size. This problematic case can always be avoided in C,
1536 but it must be handled correctly when using Fortran shared
1539 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1540 likewise for OLDDYNCOMMON and OLDDEF.
1542 Note that this test is just a heuristic, and that it is quite
1543 possible to have an uninitialized symbol in a shared object which
1544 is really a definition, rather than a common symbol. This could
1545 lead to some minor confusion when the symbol really is a common
1546 symbol in some regular object. However, I think it will be
1552 && (sec
->flags
& SEC_ALLOC
) != 0
1553 && (sec
->flags
& SEC_LOAD
) == 0
1556 newdyncommon
= TRUE
;
1558 newdyncommon
= FALSE
;
1562 && h
->root
.type
== bfd_link_hash_defined
1564 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1565 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1568 olddyncommon
= TRUE
;
1570 olddyncommon
= FALSE
;
1572 /* We now know everything about the old and new symbols. We ask the
1573 backend to check if we can merge them. */
1574 if (bed
->merge_symbol
!= NULL
)
1576 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1581 /* There are multiple definitions of a normal symbol. Skip the
1582 default symbol as well as definition from an IR object. */
1583 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1584 && !default_sym
&& h
->def_regular
1586 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1587 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1589 /* Handle a multiple definition. */
1590 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1591 abfd
, sec
, *pvalue
);
1596 /* If both the old and the new symbols look like common symbols in a
1597 dynamic object, set the size of the symbol to the larger of the
1602 && sym
->st_size
!= h
->size
)
1604 /* Since we think we have two common symbols, issue a multiple
1605 common warning if desired. Note that we only warn if the
1606 size is different. If the size is the same, we simply let
1607 the old symbol override the new one as normally happens with
1608 symbols defined in dynamic objects. */
1610 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1611 bfd_link_hash_common
, sym
->st_size
);
1612 if (sym
->st_size
> h
->size
)
1613 h
->size
= sym
->st_size
;
1615 *size_change_ok
= TRUE
;
1618 /* If we are looking at a dynamic object, and we have found a
1619 definition, we need to see if the symbol was already defined by
1620 some other object. If so, we want to use the existing
1621 definition, and we do not want to report a multiple symbol
1622 definition error; we do this by clobbering *PSEC to be
1623 bfd_und_section_ptr.
1625 We treat a common symbol as a definition if the symbol in the
1626 shared library is a function, since common symbols always
1627 represent variables; this can cause confusion in principle, but
1628 any such confusion would seem to indicate an erroneous program or
1629 shared library. We also permit a common symbol in a regular
1630 object to override a weak symbol in a shared object. */
1635 || (h
->root
.type
== bfd_link_hash_common
1636 && (newweak
|| newfunc
))))
1640 newdyncommon
= FALSE
;
1642 *psec
= sec
= bfd_und_section_ptr
;
1643 *size_change_ok
= TRUE
;
1645 /* If we get here when the old symbol is a common symbol, then
1646 we are explicitly letting it override a weak symbol or
1647 function in a dynamic object, and we don't want to warn about
1648 a type change. If the old symbol is a defined symbol, a type
1649 change warning may still be appropriate. */
1651 if (h
->root
.type
== bfd_link_hash_common
)
1652 *type_change_ok
= TRUE
;
1655 /* Handle the special case of an old common symbol merging with a
1656 new symbol which looks like a common symbol in a shared object.
1657 We change *PSEC and *PVALUE to make the new symbol look like a
1658 common symbol, and let _bfd_generic_link_add_one_symbol do the
1662 && h
->root
.type
== bfd_link_hash_common
)
1666 newdyncommon
= FALSE
;
1667 *pvalue
= sym
->st_size
;
1668 *psec
= sec
= bed
->common_section (oldsec
);
1669 *size_change_ok
= TRUE
;
1672 /* Skip weak definitions of symbols that are already defined. */
1673 if (newdef
&& olddef
&& newweak
)
1675 /* Don't skip new non-IR weak syms. */
1676 if (!(oldbfd
!= NULL
1677 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1678 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1684 /* Merge st_other. If the symbol already has a dynamic index,
1685 but visibility says it should not be visible, turn it into a
1687 elf_merge_st_other (abfd
, h
, sym
, sec
, newdef
, newdyn
);
1688 if (h
->dynindx
!= -1)
1689 switch (ELF_ST_VISIBILITY (h
->other
))
1693 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1698 /* If the old symbol is from a dynamic object, and the new symbol is
1699 a definition which is not from a dynamic object, then the new
1700 symbol overrides the old symbol. Symbols from regular files
1701 always take precedence over symbols from dynamic objects, even if
1702 they are defined after the dynamic object in the link.
1704 As above, we again permit a common symbol in a regular object to
1705 override a definition in a shared object if the shared object
1706 symbol is a function or is weak. */
1711 || (bfd_is_com_section (sec
)
1712 && (oldweak
|| oldfunc
)))
1717 /* Change the hash table entry to undefined, and let
1718 _bfd_generic_link_add_one_symbol do the right thing with the
1721 h
->root
.type
= bfd_link_hash_undefined
;
1722 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1723 *size_change_ok
= TRUE
;
1726 olddyncommon
= FALSE
;
1728 /* We again permit a type change when a common symbol may be
1729 overriding a function. */
1731 if (bfd_is_com_section (sec
))
1735 /* If a common symbol overrides a function, make sure
1736 that it isn't defined dynamically nor has type
1739 h
->type
= STT_NOTYPE
;
1741 *type_change_ok
= TRUE
;
1744 if (hi
->root
.type
== bfd_link_hash_indirect
)
1747 /* This union may have been set to be non-NULL when this symbol
1748 was seen in a dynamic object. We must force the union to be
1749 NULL, so that it is correct for a regular symbol. */
1750 h
->verinfo
.vertree
= NULL
;
1753 /* Handle the special case of a new common symbol merging with an
1754 old symbol that looks like it might be a common symbol defined in
1755 a shared object. Note that we have already handled the case in
1756 which a new common symbol should simply override the definition
1757 in the shared library. */
1760 && bfd_is_com_section (sec
)
1763 /* It would be best if we could set the hash table entry to a
1764 common symbol, but we don't know what to use for the section
1765 or the alignment. */
1766 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1767 bfd_link_hash_common
, sym
->st_size
);
1769 /* If the presumed common symbol in the dynamic object is
1770 larger, pretend that the new symbol has its size. */
1772 if (h
->size
> *pvalue
)
1775 /* We need to remember the alignment required by the symbol
1776 in the dynamic object. */
1777 BFD_ASSERT (pold_alignment
);
1778 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1781 olddyncommon
= FALSE
;
1783 h
->root
.type
= bfd_link_hash_undefined
;
1784 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1786 *size_change_ok
= TRUE
;
1787 *type_change_ok
= TRUE
;
1789 if (hi
->root
.type
== bfd_link_hash_indirect
)
1792 h
->verinfo
.vertree
= NULL
;
1797 /* Handle the case where we had a versioned symbol in a dynamic
1798 library and now find a definition in a normal object. In this
1799 case, we make the versioned symbol point to the normal one. */
1800 flip
->root
.type
= h
->root
.type
;
1801 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1802 h
->root
.type
= bfd_link_hash_indirect
;
1803 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1804 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1808 flip
->ref_dynamic
= 1;
1815 /* This function is called to create an indirect symbol from the
1816 default for the symbol with the default version if needed. The
1817 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1818 set DYNSYM if the new indirect symbol is dynamic. */
1821 _bfd_elf_add_default_symbol (bfd
*abfd
,
1822 struct bfd_link_info
*info
,
1823 struct elf_link_hash_entry
*h
,
1825 Elf_Internal_Sym
*sym
,
1829 bfd_boolean
*dynsym
)
1831 bfd_boolean type_change_ok
;
1832 bfd_boolean size_change_ok
;
1835 struct elf_link_hash_entry
*hi
;
1836 struct bfd_link_hash_entry
*bh
;
1837 const struct elf_backend_data
*bed
;
1838 bfd_boolean collect
;
1839 bfd_boolean dynamic
;
1840 bfd_boolean override
;
1842 size_t len
, shortlen
;
1844 bfd_boolean matched
;
1846 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1849 /* If this symbol has a version, and it is the default version, we
1850 create an indirect symbol from the default name to the fully
1851 decorated name. This will cause external references which do not
1852 specify a version to be bound to this version of the symbol. */
1853 p
= strchr (name
, ELF_VER_CHR
);
1854 if (h
->versioned
== unknown
)
1858 h
->versioned
= unversioned
;
1863 if (p
[1] != ELF_VER_CHR
)
1865 h
->versioned
= versioned_hidden
;
1869 h
->versioned
= versioned
;
1874 /* PR ld/19073: We may see an unversioned definition after the
1880 bed
= get_elf_backend_data (abfd
);
1881 collect
= bed
->collect
;
1882 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1884 shortlen
= p
- name
;
1885 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1886 if (shortname
== NULL
)
1888 memcpy (shortname
, name
, shortlen
);
1889 shortname
[shortlen
] = '\0';
1891 /* We are going to create a new symbol. Merge it with any existing
1892 symbol with this name. For the purposes of the merge, act as
1893 though we were defining the symbol we just defined, although we
1894 actually going to define an indirect symbol. */
1895 type_change_ok
= FALSE
;
1896 size_change_ok
= FALSE
;
1899 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1900 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1901 &type_change_ok
, &size_change_ok
, &matched
))
1907 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1909 /* If the undecorated symbol will have a version added by a
1910 script different to H, then don't indirect to/from the
1911 undecorated symbol. This isn't ideal because we may not yet
1912 have seen symbol versions, if given by a script on the
1913 command line rather than via --version-script. */
1914 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1919 = bfd_find_version_for_sym (info
->version_info
,
1920 hi
->root
.root
.string
, &hide
);
1921 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1923 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
1927 if (hi
->verinfo
.vertree
!= NULL
1928 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1934 /* Add the default symbol if not performing a relocatable link. */
1935 if (! bfd_link_relocatable (info
))
1938 if (bh
->type
== bfd_link_hash_defined
1939 && bh
->u
.def
.section
->owner
!= NULL
1940 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1942 /* Mark the previous definition from IR object as
1943 undefined so that the generic linker will override
1945 bh
->type
= bfd_link_hash_undefined
;
1946 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1948 if (! (_bfd_generic_link_add_one_symbol
1949 (info
, abfd
, shortname
, BSF_INDIRECT
,
1950 bfd_ind_section_ptr
,
1951 0, name
, FALSE
, collect
, &bh
)))
1953 hi
= (struct elf_link_hash_entry
*) bh
;
1958 /* In this case the symbol named SHORTNAME is overriding the
1959 indirect symbol we want to add. We were planning on making
1960 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1961 is the name without a version. NAME is the fully versioned
1962 name, and it is the default version.
1964 Overriding means that we already saw a definition for the
1965 symbol SHORTNAME in a regular object, and it is overriding
1966 the symbol defined in the dynamic object.
1968 When this happens, we actually want to change NAME, the
1969 symbol we just added, to refer to SHORTNAME. This will cause
1970 references to NAME in the shared object to become references
1971 to SHORTNAME in the regular object. This is what we expect
1972 when we override a function in a shared object: that the
1973 references in the shared object will be mapped to the
1974 definition in the regular object. */
1976 while (hi
->root
.type
== bfd_link_hash_indirect
1977 || hi
->root
.type
== bfd_link_hash_warning
)
1978 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1980 h
->root
.type
= bfd_link_hash_indirect
;
1981 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1985 hi
->ref_dynamic
= 1;
1989 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1994 /* Now set HI to H, so that the following code will set the
1995 other fields correctly. */
1999 /* Check if HI is a warning symbol. */
2000 if (hi
->root
.type
== bfd_link_hash_warning
)
2001 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2003 /* If there is a duplicate definition somewhere, then HI may not
2004 point to an indirect symbol. We will have reported an error to
2005 the user in that case. */
2007 if (hi
->root
.type
== bfd_link_hash_indirect
)
2009 struct elf_link_hash_entry
*ht
;
2011 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2012 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2014 /* A reference to the SHORTNAME symbol from a dynamic library
2015 will be satisfied by the versioned symbol at runtime. In
2016 effect, we have a reference to the versioned symbol. */
2017 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2018 hi
->dynamic_def
|= ht
->dynamic_def
;
2020 /* See if the new flags lead us to realize that the symbol must
2026 if (! bfd_link_executable (info
)
2033 if (hi
->ref_regular
)
2039 /* We also need to define an indirection from the nondefault version
2043 len
= strlen (name
);
2044 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2045 if (shortname
== NULL
)
2047 memcpy (shortname
, name
, shortlen
);
2048 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2050 /* Once again, merge with any existing symbol. */
2051 type_change_ok
= FALSE
;
2052 size_change_ok
= FALSE
;
2054 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2055 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2056 &type_change_ok
, &size_change_ok
, &matched
))
2064 /* Here SHORTNAME is a versioned name, so we don't expect to see
2065 the type of override we do in the case above unless it is
2066 overridden by a versioned definition. */
2067 if (hi
->root
.type
!= bfd_link_hash_defined
2068 && hi
->root
.type
!= bfd_link_hash_defweak
)
2070 /* xgettext:c-format */
2071 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2077 if (! (_bfd_generic_link_add_one_symbol
2078 (info
, abfd
, shortname
, BSF_INDIRECT
,
2079 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
2081 hi
= (struct elf_link_hash_entry
*) bh
;
2083 /* If there is a duplicate definition somewhere, then HI may not
2084 point to an indirect symbol. We will have reported an error
2085 to the user in that case. */
2087 if (hi
->root
.type
== bfd_link_hash_indirect
)
2089 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2090 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2091 hi
->dynamic_def
|= h
->dynamic_def
;
2093 /* See if the new flags lead us to realize that the symbol
2099 if (! bfd_link_executable (info
)
2105 if (hi
->ref_regular
)
2115 /* This routine is used to export all defined symbols into the dynamic
2116 symbol table. It is called via elf_link_hash_traverse. */
2119 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2121 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2123 /* Ignore indirect symbols. These are added by the versioning code. */
2124 if (h
->root
.type
== bfd_link_hash_indirect
)
2127 /* Ignore this if we won't export it. */
2128 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2131 if (h
->dynindx
== -1
2132 && (h
->def_regular
|| h
->ref_regular
)
2133 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2134 h
->root
.root
.string
))
2136 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2146 /* Look through the symbols which are defined in other shared
2147 libraries and referenced here. Update the list of version
2148 dependencies. This will be put into the .gnu.version_r section.
2149 This function is called via elf_link_hash_traverse. */
2152 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2155 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2156 Elf_Internal_Verneed
*t
;
2157 Elf_Internal_Vernaux
*a
;
2160 /* We only care about symbols defined in shared objects with version
2165 || h
->verinfo
.verdef
== NULL
2166 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2167 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2170 /* See if we already know about this version. */
2171 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2175 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2178 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2179 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2185 /* This is a new version. Add it to tree we are building. */
2190 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2193 rinfo
->failed
= TRUE
;
2197 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2198 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2199 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2203 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2206 rinfo
->failed
= TRUE
;
2210 /* Note that we are copying a string pointer here, and testing it
2211 above. If bfd_elf_string_from_elf_section is ever changed to
2212 discard the string data when low in memory, this will have to be
2214 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2216 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2217 a
->vna_nextptr
= t
->vn_auxptr
;
2219 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2222 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2229 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2230 hidden. Set *T_P to NULL if there is no match. */
2233 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2234 struct elf_link_hash_entry
*h
,
2235 const char *version_p
,
2236 struct bfd_elf_version_tree
**t_p
,
2239 struct bfd_elf_version_tree
*t
;
2241 /* Look for the version. If we find it, it is no longer weak. */
2242 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2244 if (strcmp (t
->name
, version_p
) == 0)
2248 struct bfd_elf_version_expr
*d
;
2250 len
= version_p
- h
->root
.root
.string
;
2251 alc
= (char *) bfd_malloc (len
);
2254 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2255 alc
[len
- 1] = '\0';
2256 if (alc
[len
- 2] == ELF_VER_CHR
)
2257 alc
[len
- 2] = '\0';
2259 h
->verinfo
.vertree
= t
;
2263 if (t
->globals
.list
!= NULL
)
2264 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2266 /* See if there is anything to force this symbol to
2268 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2270 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2273 && ! info
->export_dynamic
)
2287 /* Return TRUE if the symbol H is hidden by version script. */
2290 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2291 struct elf_link_hash_entry
*h
)
2294 bfd_boolean hide
= FALSE
;
2295 const struct elf_backend_data
*bed
2296 = get_elf_backend_data (info
->output_bfd
);
2298 /* Version script only hides symbols defined in regular objects. */
2299 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2302 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2303 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2305 struct bfd_elf_version_tree
*t
;
2308 if (*p
== ELF_VER_CHR
)
2312 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2316 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2321 /* If we don't have a version for this symbol, see if we can find
2323 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2326 = bfd_find_version_for_sym (info
->version_info
,
2327 h
->root
.root
.string
, &hide
);
2328 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2330 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2338 /* Figure out appropriate versions for all the symbols. We may not
2339 have the version number script until we have read all of the input
2340 files, so until that point we don't know which symbols should be
2341 local. This function is called via elf_link_hash_traverse. */
2344 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2346 struct elf_info_failed
*sinfo
;
2347 struct bfd_link_info
*info
;
2348 const struct elf_backend_data
*bed
;
2349 struct elf_info_failed eif
;
2353 sinfo
= (struct elf_info_failed
*) data
;
2356 /* Fix the symbol flags. */
2359 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2362 sinfo
->failed
= TRUE
;
2366 bed
= get_elf_backend_data (info
->output_bfd
);
2368 /* We only need version numbers for symbols defined in regular
2370 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2372 /* Hide symbols defined in discarded input sections. */
2373 if ((h
->root
.type
== bfd_link_hash_defined
2374 || h
->root
.type
== bfd_link_hash_defweak
)
2375 && discarded_section (h
->root
.u
.def
.section
))
2376 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2381 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2382 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2384 struct bfd_elf_version_tree
*t
;
2387 if (*p
== ELF_VER_CHR
)
2390 /* If there is no version string, we can just return out. */
2394 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2396 sinfo
->failed
= TRUE
;
2401 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2403 /* If we are building an application, we need to create a
2404 version node for this version. */
2405 if (t
== NULL
&& bfd_link_executable (info
))
2407 struct bfd_elf_version_tree
**pp
;
2410 /* If we aren't going to export this symbol, we don't need
2411 to worry about it. */
2412 if (h
->dynindx
== -1)
2415 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2419 sinfo
->failed
= TRUE
;
2424 t
->name_indx
= (unsigned int) -1;
2428 /* Don't count anonymous version tag. */
2429 if (sinfo
->info
->version_info
!= NULL
2430 && sinfo
->info
->version_info
->vernum
== 0)
2432 for (pp
= &sinfo
->info
->version_info
;
2436 t
->vernum
= version_index
;
2440 h
->verinfo
.vertree
= t
;
2444 /* We could not find the version for a symbol when
2445 generating a shared archive. Return an error. */
2447 /* xgettext:c-format */
2448 (_("%pB: version node not found for symbol %s"),
2449 info
->output_bfd
, h
->root
.root
.string
);
2450 bfd_set_error (bfd_error_bad_value
);
2451 sinfo
->failed
= TRUE
;
2456 /* If we don't have a version for this symbol, see if we can find
2459 && h
->verinfo
.vertree
== NULL
2460 && sinfo
->info
->version_info
!= NULL
)
2463 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2464 h
->root
.root
.string
, &hide
);
2465 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2466 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2472 /* Read and swap the relocs from the section indicated by SHDR. This
2473 may be either a REL or a RELA section. The relocations are
2474 translated into RELA relocations and stored in INTERNAL_RELOCS,
2475 which should have already been allocated to contain enough space.
2476 The EXTERNAL_RELOCS are a buffer where the external form of the
2477 relocations should be stored.
2479 Returns FALSE if something goes wrong. */
2482 elf_link_read_relocs_from_section (bfd
*abfd
,
2484 Elf_Internal_Shdr
*shdr
,
2485 void *external_relocs
,
2486 Elf_Internal_Rela
*internal_relocs
)
2488 const struct elf_backend_data
*bed
;
2489 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2490 const bfd_byte
*erela
;
2491 const bfd_byte
*erelaend
;
2492 Elf_Internal_Rela
*irela
;
2493 Elf_Internal_Shdr
*symtab_hdr
;
2496 /* Position ourselves at the start of the section. */
2497 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2500 /* Read the relocations. */
2501 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2504 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2505 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2507 bed
= get_elf_backend_data (abfd
);
2509 /* Convert the external relocations to the internal format. */
2510 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2511 swap_in
= bed
->s
->swap_reloc_in
;
2512 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2513 swap_in
= bed
->s
->swap_reloca_in
;
2516 bfd_set_error (bfd_error_wrong_format
);
2520 erela
= (const bfd_byte
*) external_relocs
;
2521 /* Setting erelaend like this and comparing with <= handles case of
2522 a fuzzed object with sh_size not a multiple of sh_entsize. */
2523 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2524 irela
= internal_relocs
;
2525 while (erela
<= erelaend
)
2529 (*swap_in
) (abfd
, erela
, irela
);
2530 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2531 if (bed
->s
->arch_size
== 64)
2535 if ((size_t) r_symndx
>= nsyms
)
2538 /* xgettext:c-format */
2539 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2540 " for offset %#" PRIx64
" in section `%pA'"),
2541 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2542 (uint64_t) irela
->r_offset
, sec
);
2543 bfd_set_error (bfd_error_bad_value
);
2547 else if (r_symndx
!= STN_UNDEF
)
2550 /* xgettext:c-format */
2551 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2552 " for offset %#" PRIx64
" in section `%pA'"
2553 " when the object file has no symbol table"),
2554 abfd
, (uint64_t) r_symndx
,
2555 (uint64_t) irela
->r_offset
, sec
);
2556 bfd_set_error (bfd_error_bad_value
);
2559 irela
+= bed
->s
->int_rels_per_ext_rel
;
2560 erela
+= shdr
->sh_entsize
;
2566 /* Read and swap the relocs for a section O. They may have been
2567 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2568 not NULL, they are used as buffers to read into. They are known to
2569 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2570 the return value is allocated using either malloc or bfd_alloc,
2571 according to the KEEP_MEMORY argument. If O has two relocation
2572 sections (both REL and RELA relocations), then the REL_HDR
2573 relocations will appear first in INTERNAL_RELOCS, followed by the
2574 RELA_HDR relocations. */
2577 _bfd_elf_link_read_relocs (bfd
*abfd
,
2579 void *external_relocs
,
2580 Elf_Internal_Rela
*internal_relocs
,
2581 bfd_boolean keep_memory
)
2583 void *alloc1
= NULL
;
2584 Elf_Internal_Rela
*alloc2
= NULL
;
2585 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2586 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2587 Elf_Internal_Rela
*internal_rela_relocs
;
2589 if (esdo
->relocs
!= NULL
)
2590 return esdo
->relocs
;
2592 if (o
->reloc_count
== 0)
2595 if (internal_relocs
== NULL
)
2599 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2601 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2603 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2604 if (internal_relocs
== NULL
)
2608 if (external_relocs
== NULL
)
2610 bfd_size_type size
= 0;
2613 size
+= esdo
->rel
.hdr
->sh_size
;
2615 size
+= esdo
->rela
.hdr
->sh_size
;
2617 alloc1
= bfd_malloc (size
);
2620 external_relocs
= alloc1
;
2623 internal_rela_relocs
= internal_relocs
;
2626 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2630 external_relocs
= (((bfd_byte
*) external_relocs
)
2631 + esdo
->rel
.hdr
->sh_size
);
2632 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2633 * bed
->s
->int_rels_per_ext_rel
);
2637 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2639 internal_rela_relocs
)))
2642 /* Cache the results for next time, if we can. */
2644 esdo
->relocs
= internal_relocs
;
2648 /* Don't free alloc2, since if it was allocated we are passing it
2649 back (under the name of internal_relocs). */
2651 return internal_relocs
;
2658 bfd_release (abfd
, alloc2
);
2665 /* Compute the size of, and allocate space for, REL_HDR which is the
2666 section header for a section containing relocations for O. */
2669 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2670 struct bfd_elf_section_reloc_data
*reldata
)
2672 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2674 /* That allows us to calculate the size of the section. */
2675 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2677 /* The contents field must last into write_object_contents, so we
2678 allocate it with bfd_alloc rather than malloc. Also since we
2679 cannot be sure that the contents will actually be filled in,
2680 we zero the allocated space. */
2681 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2682 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2685 if (reldata
->hashes
== NULL
&& reldata
->count
)
2687 struct elf_link_hash_entry
**p
;
2689 p
= ((struct elf_link_hash_entry
**)
2690 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2694 reldata
->hashes
= p
;
2700 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2701 originated from the section given by INPUT_REL_HDR) to the
2705 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2706 asection
*input_section
,
2707 Elf_Internal_Shdr
*input_rel_hdr
,
2708 Elf_Internal_Rela
*internal_relocs
,
2709 struct elf_link_hash_entry
**rel_hash
2712 Elf_Internal_Rela
*irela
;
2713 Elf_Internal_Rela
*irelaend
;
2715 struct bfd_elf_section_reloc_data
*output_reldata
;
2716 asection
*output_section
;
2717 const struct elf_backend_data
*bed
;
2718 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2719 struct bfd_elf_section_data
*esdo
;
2721 output_section
= input_section
->output_section
;
2723 bed
= get_elf_backend_data (output_bfd
);
2724 esdo
= elf_section_data (output_section
);
2725 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2727 output_reldata
= &esdo
->rel
;
2728 swap_out
= bed
->s
->swap_reloc_out
;
2730 else if (esdo
->rela
.hdr
2731 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2733 output_reldata
= &esdo
->rela
;
2734 swap_out
= bed
->s
->swap_reloca_out
;
2739 /* xgettext:c-format */
2740 (_("%pB: relocation size mismatch in %pB section %pA"),
2741 output_bfd
, input_section
->owner
, input_section
);
2742 bfd_set_error (bfd_error_wrong_format
);
2746 erel
= output_reldata
->hdr
->contents
;
2747 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2748 irela
= internal_relocs
;
2749 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2750 * bed
->s
->int_rels_per_ext_rel
);
2751 while (irela
< irelaend
)
2753 (*swap_out
) (output_bfd
, irela
, erel
);
2754 irela
+= bed
->s
->int_rels_per_ext_rel
;
2755 erel
+= input_rel_hdr
->sh_entsize
;
2758 /* Bump the counter, so that we know where to add the next set of
2760 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2765 /* Make weak undefined symbols in PIE dynamic. */
2768 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2769 struct elf_link_hash_entry
*h
)
2771 if (bfd_link_pie (info
)
2773 && h
->root
.type
== bfd_link_hash_undefweak
)
2774 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2779 /* Fix up the flags for a symbol. This handles various cases which
2780 can only be fixed after all the input files are seen. This is
2781 currently called by both adjust_dynamic_symbol and
2782 assign_sym_version, which is unnecessary but perhaps more robust in
2783 the face of future changes. */
2786 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2787 struct elf_info_failed
*eif
)
2789 const struct elf_backend_data
*bed
;
2791 /* If this symbol was mentioned in a non-ELF file, try to set
2792 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2793 permit a non-ELF file to correctly refer to a symbol defined in
2794 an ELF dynamic object. */
2797 while (h
->root
.type
== bfd_link_hash_indirect
)
2798 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2800 if (h
->root
.type
!= bfd_link_hash_defined
2801 && h
->root
.type
!= bfd_link_hash_defweak
)
2804 h
->ref_regular_nonweak
= 1;
2808 if (h
->root
.u
.def
.section
->owner
!= NULL
2809 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2810 == bfd_target_elf_flavour
))
2813 h
->ref_regular_nonweak
= 1;
2819 if (h
->dynindx
== -1
2823 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2832 /* Unfortunately, NON_ELF is only correct if the symbol
2833 was first seen in a non-ELF file. Fortunately, if the symbol
2834 was first seen in an ELF file, we're probably OK unless the
2835 symbol was defined in a non-ELF file. Catch that case here.
2836 FIXME: We're still in trouble if the symbol was first seen in
2837 a dynamic object, and then later in a non-ELF regular object. */
2838 if ((h
->root
.type
== bfd_link_hash_defined
2839 || h
->root
.type
== bfd_link_hash_defweak
)
2841 && (h
->root
.u
.def
.section
->owner
!= NULL
2842 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2843 != bfd_target_elf_flavour
)
2844 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2845 && !h
->def_dynamic
)))
2849 /* Backend specific symbol fixup. */
2850 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2851 if (bed
->elf_backend_fixup_symbol
2852 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2855 /* If this is a final link, and the symbol was defined as a common
2856 symbol in a regular object file, and there was no definition in
2857 any dynamic object, then the linker will have allocated space for
2858 the symbol in a common section but the DEF_REGULAR
2859 flag will not have been set. */
2860 if (h
->root
.type
== bfd_link_hash_defined
2864 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2867 /* Symbols defined in discarded sections shouldn't be dynamic. */
2868 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2869 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2871 /* If a weak undefined symbol has non-default visibility, we also
2872 hide it from the dynamic linker. */
2873 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2874 && h
->root
.type
== bfd_link_hash_undefweak
)
2875 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2877 /* A hidden versioned symbol in executable should be forced local if
2878 it is is locally defined, not referenced by shared library and not
2880 else if (bfd_link_executable (eif
->info
)
2881 && h
->versioned
== versioned_hidden
2882 && !eif
->info
->export_dynamic
2886 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2888 /* If -Bsymbolic was used (which means to bind references to global
2889 symbols to the definition within the shared object), and this
2890 symbol was defined in a regular object, then it actually doesn't
2891 need a PLT entry. Likewise, if the symbol has non-default
2892 visibility. If the symbol has hidden or internal visibility, we
2893 will force it local. */
2894 else if (h
->needs_plt
2895 && bfd_link_pic (eif
->info
)
2896 && is_elf_hash_table (eif
->info
->hash
)
2897 && (SYMBOLIC_BIND (eif
->info
, h
)
2898 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2901 bfd_boolean force_local
;
2903 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2904 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2905 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2908 /* If this is a weak defined symbol in a dynamic object, and we know
2909 the real definition in the dynamic object, copy interesting flags
2910 over to the real definition. */
2911 if (h
->is_weakalias
)
2913 struct elf_link_hash_entry
*def
= weakdef (h
);
2915 /* If the real definition is defined by a regular object file,
2916 don't do anything special. See the longer description in
2917 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2918 bfd_link_hash_defined as it was when put on the alias list
2919 then it must have originally been a versioned symbol (for
2920 which a non-versioned indirect symbol is created) and later
2921 a definition for the non-versioned symbol is found. In that
2922 case the indirection is flipped with the versioned symbol
2923 becoming an indirect pointing at the non-versioned symbol.
2924 Thus, not an alias any more. */
2925 if (def
->def_regular
2926 || def
->root
.type
!= bfd_link_hash_defined
)
2929 while ((h
= h
->u
.alias
) != def
)
2930 h
->is_weakalias
= 0;
2934 while (h
->root
.type
== bfd_link_hash_indirect
)
2935 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2936 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2937 || h
->root
.type
== bfd_link_hash_defweak
);
2938 BFD_ASSERT (def
->def_dynamic
);
2939 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2946 /* Make the backend pick a good value for a dynamic symbol. This is
2947 called via elf_link_hash_traverse, and also calls itself
2951 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2953 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2954 struct elf_link_hash_table
*htab
;
2955 const struct elf_backend_data
*bed
;
2957 if (! is_elf_hash_table (eif
->info
->hash
))
2960 /* Ignore indirect symbols. These are added by the versioning code. */
2961 if (h
->root
.type
== bfd_link_hash_indirect
)
2964 /* Fix the symbol flags. */
2965 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2968 htab
= elf_hash_table (eif
->info
);
2969 bed
= get_elf_backend_data (htab
->dynobj
);
2971 if (h
->root
.type
== bfd_link_hash_undefweak
)
2973 if (eif
->info
->dynamic_undefined_weak
== 0)
2974 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2975 else if (eif
->info
->dynamic_undefined_weak
> 0
2977 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2978 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
2979 h
->root
.root
.string
))
2981 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2989 /* If this symbol does not require a PLT entry, and it is not
2990 defined by a dynamic object, or is not referenced by a regular
2991 object, ignore it. We do have to handle a weak defined symbol,
2992 even if no regular object refers to it, if we decided to add it
2993 to the dynamic symbol table. FIXME: Do we normally need to worry
2994 about symbols which are defined by one dynamic object and
2995 referenced by another one? */
2997 && h
->type
!= STT_GNU_IFUNC
3001 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3003 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3007 /* If we've already adjusted this symbol, don't do it again. This
3008 can happen via a recursive call. */
3009 if (h
->dynamic_adjusted
)
3012 /* Don't look at this symbol again. Note that we must set this
3013 after checking the above conditions, because we may look at a
3014 symbol once, decide not to do anything, and then get called
3015 recursively later after REF_REGULAR is set below. */
3016 h
->dynamic_adjusted
= 1;
3018 /* If this is a weak definition, and we know a real definition, and
3019 the real symbol is not itself defined by a regular object file,
3020 then get a good value for the real definition. We handle the
3021 real symbol first, for the convenience of the backend routine.
3023 Note that there is a confusing case here. If the real definition
3024 is defined by a regular object file, we don't get the real symbol
3025 from the dynamic object, but we do get the weak symbol. If the
3026 processor backend uses a COPY reloc, then if some routine in the
3027 dynamic object changes the real symbol, we will not see that
3028 change in the corresponding weak symbol. This is the way other
3029 ELF linkers work as well, and seems to be a result of the shared
3032 I will clarify this issue. Most SVR4 shared libraries define the
3033 variable _timezone and define timezone as a weak synonym. The
3034 tzset call changes _timezone. If you write
3035 extern int timezone;
3037 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3038 you might expect that, since timezone is a synonym for _timezone,
3039 the same number will print both times. However, if the processor
3040 backend uses a COPY reloc, then actually timezone will be copied
3041 into your process image, and, since you define _timezone
3042 yourself, _timezone will not. Thus timezone and _timezone will
3043 wind up at different memory locations. The tzset call will set
3044 _timezone, leaving timezone unchanged. */
3046 if (h
->is_weakalias
)
3048 struct elf_link_hash_entry
*def
= weakdef (h
);
3050 /* If we get to this point, there is an implicit reference to
3051 the alias by a regular object file via the weak symbol H. */
3052 def
->ref_regular
= 1;
3054 /* Ensure that the backend adjust_dynamic_symbol function sees
3055 the strong alias before H by recursively calling ourselves. */
3056 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3060 /* If a symbol has no type and no size and does not require a PLT
3061 entry, then we are probably about to do the wrong thing here: we
3062 are probably going to create a COPY reloc for an empty object.
3063 This case can arise when a shared object is built with assembly
3064 code, and the assembly code fails to set the symbol type. */
3066 && h
->type
== STT_NOTYPE
3069 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3070 h
->root
.root
.string
);
3072 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3081 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3085 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3086 struct elf_link_hash_entry
*h
,
3089 unsigned int power_of_two
;
3091 asection
*sec
= h
->root
.u
.def
.section
;
3093 /* The section alignment of the definition is the maximum alignment
3094 requirement of symbols defined in the section. Since we don't
3095 know the symbol alignment requirement, we start with the
3096 maximum alignment and check low bits of the symbol address
3097 for the minimum alignment. */
3098 power_of_two
= bfd_section_alignment (sec
);
3099 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3100 while ((h
->root
.u
.def
.value
& mask
) != 0)
3106 if (power_of_two
> bfd_section_alignment (dynbss
))
3108 /* Adjust the section alignment if needed. */
3109 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3113 /* We make sure that the symbol will be aligned properly. */
3114 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3116 /* Define the symbol as being at this point in DYNBSS. */
3117 h
->root
.u
.def
.section
= dynbss
;
3118 h
->root
.u
.def
.value
= dynbss
->size
;
3120 /* Increment the size of DYNBSS to make room for the symbol. */
3121 dynbss
->size
+= h
->size
;
3123 /* No error if extern_protected_data is true. */
3124 if (h
->protected_def
3125 && (!info
->extern_protected_data
3126 || (info
->extern_protected_data
< 0
3127 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3128 info
->callbacks
->einfo
3129 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3130 h
->root
.root
.string
);
3135 /* Adjust all external symbols pointing into SEC_MERGE sections
3136 to reflect the object merging within the sections. */
3139 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3143 if ((h
->root
.type
== bfd_link_hash_defined
3144 || h
->root
.type
== bfd_link_hash_defweak
)
3145 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3146 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3148 bfd
*output_bfd
= (bfd
*) data
;
3150 h
->root
.u
.def
.value
=
3151 _bfd_merged_section_offset (output_bfd
,
3152 &h
->root
.u
.def
.section
,
3153 elf_section_data (sec
)->sec_info
,
3154 h
->root
.u
.def
.value
);
3160 /* Returns false if the symbol referred to by H should be considered
3161 to resolve local to the current module, and true if it should be
3162 considered to bind dynamically. */
3165 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3166 struct bfd_link_info
*info
,
3167 bfd_boolean not_local_protected
)
3169 bfd_boolean binding_stays_local_p
;
3170 const struct elf_backend_data
*bed
;
3171 struct elf_link_hash_table
*hash_table
;
3176 while (h
->root
.type
== bfd_link_hash_indirect
3177 || h
->root
.type
== bfd_link_hash_warning
)
3178 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3180 /* If it was forced local, then clearly it's not dynamic. */
3181 if (h
->dynindx
== -1)
3183 if (h
->forced_local
)
3186 /* Identify the cases where name binding rules say that a
3187 visible symbol resolves locally. */
3188 binding_stays_local_p
= (bfd_link_executable (info
)
3189 || SYMBOLIC_BIND (info
, h
));
3191 switch (ELF_ST_VISIBILITY (h
->other
))
3198 hash_table
= elf_hash_table (info
);
3199 if (!is_elf_hash_table (hash_table
))
3202 bed
= get_elf_backend_data (hash_table
->dynobj
);
3204 /* Proper resolution for function pointer equality may require
3205 that these symbols perhaps be resolved dynamically, even though
3206 we should be resolving them to the current module. */
3207 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3208 binding_stays_local_p
= TRUE
;
3215 /* If it isn't defined locally, then clearly it's dynamic. */
3216 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3219 /* Otherwise, the symbol is dynamic if binding rules don't tell
3220 us that it remains local. */
3221 return !binding_stays_local_p
;
3224 /* Return true if the symbol referred to by H should be considered
3225 to resolve local to the current module, and false otherwise. Differs
3226 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3227 undefined symbols. The two functions are virtually identical except
3228 for the place where dynindx == -1 is tested. If that test is true,
3229 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3230 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3232 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3233 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3234 treatment of undefined weak symbols. For those that do not make
3235 undefined weak symbols dynamic, both functions may return false. */
3238 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3239 struct bfd_link_info
*info
,
3240 bfd_boolean local_protected
)
3242 const struct elf_backend_data
*bed
;
3243 struct elf_link_hash_table
*hash_table
;
3245 /* If it's a local sym, of course we resolve locally. */
3249 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3250 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3251 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3254 /* Forced local symbols resolve locally. */
3255 if (h
->forced_local
)
3258 /* Common symbols that become definitions don't get the DEF_REGULAR
3259 flag set, so test it first, and don't bail out. */
3260 if (ELF_COMMON_DEF_P (h
))
3262 /* If we don't have a definition in a regular file, then we can't
3263 resolve locally. The sym is either undefined or dynamic. */
3264 else if (!h
->def_regular
)
3267 /* Non-dynamic symbols resolve locally. */
3268 if (h
->dynindx
== -1)
3271 /* At this point, we know the symbol is defined and dynamic. In an
3272 executable it must resolve locally, likewise when building symbolic
3273 shared libraries. */
3274 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3277 /* Now deal with defined dynamic symbols in shared libraries. Ones
3278 with default visibility might not resolve locally. */
3279 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3282 hash_table
= elf_hash_table (info
);
3283 if (!is_elf_hash_table (hash_table
))
3286 bed
= get_elf_backend_data (hash_table
->dynobj
);
3288 /* If extern_protected_data is false, STV_PROTECTED non-function
3289 symbols are local. */
3290 if ((!info
->extern_protected_data
3291 || (info
->extern_protected_data
< 0
3292 && !bed
->extern_protected_data
))
3293 && !bed
->is_function_type (h
->type
))
3296 /* Function pointer equality tests may require that STV_PROTECTED
3297 symbols be treated as dynamic symbols. If the address of a
3298 function not defined in an executable is set to that function's
3299 plt entry in the executable, then the address of the function in
3300 a shared library must also be the plt entry in the executable. */
3301 return local_protected
;
3304 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3305 aligned. Returns the first TLS output section. */
3307 struct bfd_section
*
3308 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3310 struct bfd_section
*sec
, *tls
;
3311 unsigned int align
= 0;
3313 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3314 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3318 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3319 if (sec
->alignment_power
> align
)
3320 align
= sec
->alignment_power
;
3322 elf_hash_table (info
)->tls_sec
= tls
;
3324 /* Ensure the alignment of the first section (usually .tdata) is the largest
3325 alignment, so that the tls segment starts aligned. */
3327 tls
->alignment_power
= align
;
3332 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3334 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3335 Elf_Internal_Sym
*sym
)
3337 const struct elf_backend_data
*bed
;
3339 /* Local symbols do not count, but target specific ones might. */
3340 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3341 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3344 bed
= get_elf_backend_data (abfd
);
3345 /* Function symbols do not count. */
3346 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3349 /* If the section is undefined, then so is the symbol. */
3350 if (sym
->st_shndx
== SHN_UNDEF
)
3353 /* If the symbol is defined in the common section, then
3354 it is a common definition and so does not count. */
3355 if (bed
->common_definition (sym
))
3358 /* If the symbol is in a target specific section then we
3359 must rely upon the backend to tell us what it is. */
3360 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3361 /* FIXME - this function is not coded yet:
3363 return _bfd_is_global_symbol_definition (abfd, sym);
3365 Instead for now assume that the definition is not global,
3366 Even if this is wrong, at least the linker will behave
3367 in the same way that it used to do. */
3373 /* Search the symbol table of the archive element of the archive ABFD
3374 whose archive map contains a mention of SYMDEF, and determine if
3375 the symbol is defined in this element. */
3377 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3379 Elf_Internal_Shdr
* hdr
;
3383 Elf_Internal_Sym
*isymbuf
;
3384 Elf_Internal_Sym
*isym
;
3385 Elf_Internal_Sym
*isymend
;
3388 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3392 if (! bfd_check_format (abfd
, bfd_object
))
3395 /* Select the appropriate symbol table. If we don't know if the
3396 object file is an IR object, give linker LTO plugin a chance to
3397 get the correct symbol table. */
3398 if (abfd
->plugin_format
== bfd_plugin_yes
3399 #if BFD_SUPPORTS_PLUGINS
3400 || (abfd
->plugin_format
== bfd_plugin_unknown
3401 && bfd_link_plugin_object_p (abfd
))
3405 /* Use the IR symbol table if the object has been claimed by
3407 abfd
= abfd
->plugin_dummy_bfd
;
3408 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3410 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3411 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3413 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3415 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3417 /* The sh_info field of the symtab header tells us where the
3418 external symbols start. We don't care about the local symbols. */
3419 if (elf_bad_symtab (abfd
))
3421 extsymcount
= symcount
;
3426 extsymcount
= symcount
- hdr
->sh_info
;
3427 extsymoff
= hdr
->sh_info
;
3430 if (extsymcount
== 0)
3433 /* Read in the symbol table. */
3434 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3436 if (isymbuf
== NULL
)
3439 /* Scan the symbol table looking for SYMDEF. */
3441 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3445 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3450 if (strcmp (name
, symdef
->name
) == 0)
3452 result
= is_global_data_symbol_definition (abfd
, isym
);
3462 /* Add an entry to the .dynamic table. */
3465 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3469 struct elf_link_hash_table
*hash_table
;
3470 const struct elf_backend_data
*bed
;
3472 bfd_size_type newsize
;
3473 bfd_byte
*newcontents
;
3474 Elf_Internal_Dyn dyn
;
3476 hash_table
= elf_hash_table (info
);
3477 if (! is_elf_hash_table (hash_table
))
3480 if (tag
== DT_RELA
|| tag
== DT_REL
)
3481 hash_table
->dynamic_relocs
= TRUE
;
3483 bed
= get_elf_backend_data (hash_table
->dynobj
);
3484 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3485 BFD_ASSERT (s
!= NULL
);
3487 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3488 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3489 if (newcontents
== NULL
)
3493 dyn
.d_un
.d_val
= val
;
3494 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3497 s
->contents
= newcontents
;
3502 /* Strip zero-sized dynamic sections. */
3505 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3507 struct elf_link_hash_table
*hash_table
;
3508 const struct elf_backend_data
*bed
;
3509 asection
*s
, *sdynamic
, **pp
;
3510 asection
*rela_dyn
, *rel_dyn
;
3511 Elf_Internal_Dyn dyn
;
3512 bfd_byte
*extdyn
, *next
;
3513 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3514 bfd_boolean strip_zero_sized
;
3515 bfd_boolean strip_zero_sized_plt
;
3517 if (bfd_link_relocatable (info
))
3520 hash_table
= elf_hash_table (info
);
3521 if (!is_elf_hash_table (hash_table
))
3524 if (!hash_table
->dynobj
)
3527 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3531 bed
= get_elf_backend_data (hash_table
->dynobj
);
3532 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3534 strip_zero_sized
= FALSE
;
3535 strip_zero_sized_plt
= FALSE
;
3537 /* Strip zero-sized dynamic sections. */
3538 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3539 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3540 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3544 || s
== hash_table
->srelplt
->output_section
3545 || s
== hash_table
->splt
->output_section
))
3548 info
->output_bfd
->section_count
--;
3549 strip_zero_sized
= TRUE
;
3554 else if (s
== hash_table
->splt
->output_section
)
3556 s
= hash_table
->splt
;
3557 strip_zero_sized_plt
= TRUE
;
3560 s
= hash_table
->srelplt
;
3561 s
->flags
|= SEC_EXCLUDE
;
3562 s
->output_section
= bfd_abs_section_ptr
;
3567 if (strip_zero_sized_plt
)
3568 for (extdyn
= sdynamic
->contents
;
3569 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3572 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3573 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3581 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3582 the procedure linkage table (the .plt section) has been
3584 memmove (extdyn
, next
,
3585 sdynamic
->size
- (next
- sdynamic
->contents
));
3590 if (strip_zero_sized
)
3592 /* Regenerate program headers. */
3593 elf_seg_map (info
->output_bfd
) = NULL
;
3594 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
);
3600 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3601 1 if a DT_NEEDED tag already exists, and 0 on success. */
3604 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3606 struct elf_link_hash_table
*hash_table
;
3610 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3613 hash_table
= elf_hash_table (info
);
3614 soname
= elf_dt_name (abfd
);
3615 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3616 if (strindex
== (size_t) -1)
3619 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3622 const struct elf_backend_data
*bed
;
3625 bed
= get_elf_backend_data (hash_table
->dynobj
);
3626 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3628 for (extdyn
= sdyn
->contents
;
3629 extdyn
< sdyn
->contents
+ sdyn
->size
;
3630 extdyn
+= bed
->s
->sizeof_dyn
)
3632 Elf_Internal_Dyn dyn
;
3634 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3635 if (dyn
.d_tag
== DT_NEEDED
3636 && dyn
.d_un
.d_val
== strindex
)
3638 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3644 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3647 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3653 /* Return true if SONAME is on the needed list between NEEDED and STOP
3654 (or the end of list if STOP is NULL), and needed by a library that
3658 on_needed_list (const char *soname
,
3659 struct bfd_link_needed_list
*needed
,
3660 struct bfd_link_needed_list
*stop
)
3662 struct bfd_link_needed_list
*look
;
3663 for (look
= needed
; look
!= stop
; look
= look
->next
)
3664 if (strcmp (soname
, look
->name
) == 0
3665 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3666 /* If needed by a library that itself is not directly
3667 needed, recursively check whether that library is
3668 indirectly needed. Since we add DT_NEEDED entries to
3669 the end of the list, library dependencies appear after
3670 the library. Therefore search prior to the current
3671 LOOK, preventing possible infinite recursion. */
3672 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3678 /* Sort symbol by value, section, size, and type. */
3680 elf_sort_symbol (const void *arg1
, const void *arg2
)
3682 const struct elf_link_hash_entry
*h1
;
3683 const struct elf_link_hash_entry
*h2
;
3684 bfd_signed_vma vdiff
;
3689 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3690 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3691 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3693 return vdiff
> 0 ? 1 : -1;
3695 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3699 /* Sort so that sized symbols are selected over zero size symbols. */
3700 vdiff
= h1
->size
- h2
->size
;
3702 return vdiff
> 0 ? 1 : -1;
3704 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3705 if (h1
->type
!= h2
->type
)
3706 return h1
->type
- h2
->type
;
3708 /* If symbols are properly sized and typed, and multiple strong
3709 aliases are not defined in a shared library by the user we
3710 shouldn't get here. Unfortunately linker script symbols like
3711 __bss_start sometimes match a user symbol defined at the start of
3712 .bss without proper size and type. We'd like to preference the
3713 user symbol over reserved system symbols. Sort on leading
3715 n1
= h1
->root
.root
.string
;
3716 n2
= h2
->root
.root
.string
;
3729 /* Final sort on name selects user symbols like '_u' over reserved
3730 system symbols like '_Z' and also will avoid qsort instability. */
3734 /* This function is used to adjust offsets into .dynstr for
3735 dynamic symbols. This is called via elf_link_hash_traverse. */
3738 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3740 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3742 if (h
->dynindx
!= -1)
3743 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3747 /* Assign string offsets in .dynstr, update all structures referencing
3751 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3753 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3754 struct elf_link_local_dynamic_entry
*entry
;
3755 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3756 bfd
*dynobj
= hash_table
->dynobj
;
3759 const struct elf_backend_data
*bed
;
3762 _bfd_elf_strtab_finalize (dynstr
);
3763 size
= _bfd_elf_strtab_size (dynstr
);
3765 bed
= get_elf_backend_data (dynobj
);
3766 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3767 BFD_ASSERT (sdyn
!= NULL
);
3769 /* Update all .dynamic entries referencing .dynstr strings. */
3770 for (extdyn
= sdyn
->contents
;
3771 extdyn
< sdyn
->contents
+ sdyn
->size
;
3772 extdyn
+= bed
->s
->sizeof_dyn
)
3774 Elf_Internal_Dyn dyn
;
3776 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3780 dyn
.d_un
.d_val
= size
;
3790 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3795 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3798 /* Now update local dynamic symbols. */
3799 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3800 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3801 entry
->isym
.st_name
);
3803 /* And the rest of dynamic symbols. */
3804 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3806 /* Adjust version definitions. */
3807 if (elf_tdata (output_bfd
)->cverdefs
)
3812 Elf_Internal_Verdef def
;
3813 Elf_Internal_Verdaux defaux
;
3815 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3819 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3821 p
+= sizeof (Elf_External_Verdef
);
3822 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3824 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3826 _bfd_elf_swap_verdaux_in (output_bfd
,
3827 (Elf_External_Verdaux
*) p
, &defaux
);
3828 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3830 _bfd_elf_swap_verdaux_out (output_bfd
,
3831 &defaux
, (Elf_External_Verdaux
*) p
);
3832 p
+= sizeof (Elf_External_Verdaux
);
3835 while (def
.vd_next
);
3838 /* Adjust version references. */
3839 if (elf_tdata (output_bfd
)->verref
)
3844 Elf_Internal_Verneed need
;
3845 Elf_Internal_Vernaux needaux
;
3847 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3851 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3853 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3854 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3855 (Elf_External_Verneed
*) p
);
3856 p
+= sizeof (Elf_External_Verneed
);
3857 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3859 _bfd_elf_swap_vernaux_in (output_bfd
,
3860 (Elf_External_Vernaux
*) p
, &needaux
);
3861 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3863 _bfd_elf_swap_vernaux_out (output_bfd
,
3865 (Elf_External_Vernaux
*) p
);
3866 p
+= sizeof (Elf_External_Vernaux
);
3869 while (need
.vn_next
);
3875 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3876 The default is to only match when the INPUT and OUTPUT are exactly
3880 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3881 const bfd_target
*output
)
3883 return input
== output
;
3886 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3887 This version is used when different targets for the same architecture
3888 are virtually identical. */
3891 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3892 const bfd_target
*output
)
3894 const struct elf_backend_data
*obed
, *ibed
;
3896 if (input
== output
)
3899 ibed
= xvec_get_elf_backend_data (input
);
3900 obed
= xvec_get_elf_backend_data (output
);
3902 if (ibed
->arch
!= obed
->arch
)
3905 /* If both backends are using this function, deem them compatible. */
3906 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3909 /* Make a special call to the linker "notice" function to tell it that
3910 we are about to handle an as-needed lib, or have finished
3911 processing the lib. */
3914 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3915 struct bfd_link_info
*info
,
3916 enum notice_asneeded_action act
)
3918 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3921 /* Check relocations an ELF object file. */
3924 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3926 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3927 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3929 /* If this object is the same format as the output object, and it is
3930 not a shared library, then let the backend look through the
3933 This is required to build global offset table entries and to
3934 arrange for dynamic relocs. It is not required for the
3935 particular common case of linking non PIC code, even when linking
3936 against shared libraries, but unfortunately there is no way of
3937 knowing whether an object file has been compiled PIC or not.
3938 Looking through the relocs is not particularly time consuming.
3939 The problem is that we must either (1) keep the relocs in memory,
3940 which causes the linker to require additional runtime memory or
3941 (2) read the relocs twice from the input file, which wastes time.
3942 This would be a good case for using mmap.
3944 I have no idea how to handle linking PIC code into a file of a
3945 different format. It probably can't be done. */
3946 if ((abfd
->flags
& DYNAMIC
) == 0
3947 && is_elf_hash_table (htab
)
3948 && bed
->check_relocs
!= NULL
3949 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
3950 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
3954 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3956 Elf_Internal_Rela
*internal_relocs
;
3959 /* Don't check relocations in excluded sections. Don't do
3960 anything special with non-loaded, non-alloced sections.
3961 In particular, any relocs in such sections should not
3962 affect GOT and PLT reference counting (ie. we don't
3963 allow them to create GOT or PLT entries), there's no
3964 possibility or desire to optimize TLS relocs, and
3965 there's not much point in propagating relocs to shared
3966 libs that the dynamic linker won't relocate. */
3967 if ((o
->flags
& SEC_ALLOC
) == 0
3968 || (o
->flags
& SEC_RELOC
) == 0
3969 || (o
->flags
& SEC_EXCLUDE
) != 0
3970 || o
->reloc_count
== 0
3971 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
3972 && (o
->flags
& SEC_DEBUGGING
) != 0)
3973 || bfd_is_abs_section (o
->output_section
))
3976 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
3978 if (internal_relocs
== NULL
)
3981 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
3983 if (elf_section_data (o
)->relocs
!= internal_relocs
)
3984 free (internal_relocs
);
3994 /* Add symbols from an ELF object file to the linker hash table. */
3997 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3999 Elf_Internal_Ehdr
*ehdr
;
4000 Elf_Internal_Shdr
*hdr
;
4004 struct elf_link_hash_entry
**sym_hash
;
4005 bfd_boolean dynamic
;
4006 Elf_External_Versym
*extversym
= NULL
;
4007 Elf_External_Versym
*extversym_end
= NULL
;
4008 Elf_External_Versym
*ever
;
4009 struct elf_link_hash_entry
*weaks
;
4010 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4011 size_t nondeflt_vers_cnt
= 0;
4012 Elf_Internal_Sym
*isymbuf
= NULL
;
4013 Elf_Internal_Sym
*isym
;
4014 Elf_Internal_Sym
*isymend
;
4015 const struct elf_backend_data
*bed
;
4016 bfd_boolean add_needed
;
4017 struct elf_link_hash_table
*htab
;
4018 void *alloc_mark
= NULL
;
4019 struct bfd_hash_entry
**old_table
= NULL
;
4020 unsigned int old_size
= 0;
4021 unsigned int old_count
= 0;
4022 void *old_tab
= NULL
;
4024 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4025 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4026 void *old_strtab
= NULL
;
4029 bfd_boolean just_syms
;
4031 htab
= elf_hash_table (info
);
4032 bed
= get_elf_backend_data (abfd
);
4034 if ((abfd
->flags
& DYNAMIC
) == 0)
4040 /* You can't use -r against a dynamic object. Also, there's no
4041 hope of using a dynamic object which does not exactly match
4042 the format of the output file. */
4043 if (bfd_link_relocatable (info
)
4044 || !is_elf_hash_table (htab
)
4045 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4047 if (bfd_link_relocatable (info
))
4048 bfd_set_error (bfd_error_invalid_operation
);
4050 bfd_set_error (bfd_error_wrong_format
);
4055 ehdr
= elf_elfheader (abfd
);
4056 if (info
->warn_alternate_em
4057 && bed
->elf_machine_code
!= ehdr
->e_machine
4058 && ((bed
->elf_machine_alt1
!= 0
4059 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4060 || (bed
->elf_machine_alt2
!= 0
4061 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4063 /* xgettext:c-format */
4064 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4065 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4067 /* As a GNU extension, any input sections which are named
4068 .gnu.warning.SYMBOL are treated as warning symbols for the given
4069 symbol. This differs from .gnu.warning sections, which generate
4070 warnings when they are included in an output file. */
4071 /* PR 12761: Also generate this warning when building shared libraries. */
4072 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4076 name
= bfd_section_name (s
);
4077 if (CONST_STRNEQ (name
, ".gnu.warning."))
4082 name
+= sizeof ".gnu.warning." - 1;
4084 /* If this is a shared object, then look up the symbol
4085 in the hash table. If it is there, and it is already
4086 been defined, then we will not be using the entry
4087 from this shared object, so we don't need to warn.
4088 FIXME: If we see the definition in a regular object
4089 later on, we will warn, but we shouldn't. The only
4090 fix is to keep track of what warnings we are supposed
4091 to emit, and then handle them all at the end of the
4095 struct elf_link_hash_entry
*h
;
4097 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
4099 /* FIXME: What about bfd_link_hash_common? */
4101 && (h
->root
.type
== bfd_link_hash_defined
4102 || h
->root
.type
== bfd_link_hash_defweak
))
4107 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4111 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4116 if (! (_bfd_generic_link_add_one_symbol
4117 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4118 FALSE
, bed
->collect
, NULL
)))
4121 if (bfd_link_executable (info
))
4123 /* Clobber the section size so that the warning does
4124 not get copied into the output file. */
4127 /* Also set SEC_EXCLUDE, so that symbols defined in
4128 the warning section don't get copied to the output. */
4129 s
->flags
|= SEC_EXCLUDE
;
4134 just_syms
= ((s
= abfd
->sections
) != NULL
4135 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4140 /* If we are creating a shared library, create all the dynamic
4141 sections immediately. We need to attach them to something,
4142 so we attach them to this BFD, provided it is the right
4143 format and is not from ld --just-symbols. Always create the
4144 dynamic sections for -E/--dynamic-list. FIXME: If there
4145 are no input BFD's of the same format as the output, we can't
4146 make a shared library. */
4148 && (bfd_link_pic (info
)
4149 || (!bfd_link_relocatable (info
)
4151 && (info
->export_dynamic
|| info
->dynamic
)))
4152 && is_elf_hash_table (htab
)
4153 && info
->output_bfd
->xvec
== abfd
->xvec
4154 && !htab
->dynamic_sections_created
)
4156 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4160 else if (!is_elf_hash_table (htab
))
4164 const char *soname
= NULL
;
4166 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4167 const Elf_Internal_Phdr
*phdr
;
4168 struct elf_link_loaded_list
*loaded_lib
;
4170 /* ld --just-symbols and dynamic objects don't mix very well.
4171 ld shouldn't allow it. */
4175 /* If this dynamic lib was specified on the command line with
4176 --as-needed in effect, then we don't want to add a DT_NEEDED
4177 tag unless the lib is actually used. Similary for libs brought
4178 in by another lib's DT_NEEDED. When --no-add-needed is used
4179 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4180 any dynamic library in DT_NEEDED tags in the dynamic lib at
4182 add_needed
= (elf_dyn_lib_class (abfd
)
4183 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4184 | DYN_NO_NEEDED
)) == 0;
4186 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4191 unsigned int elfsec
;
4192 unsigned long shlink
;
4194 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4201 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4202 if (elfsec
== SHN_BAD
)
4203 goto error_free_dyn
;
4204 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4206 for (extdyn
= dynbuf
;
4207 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4208 extdyn
+= bed
->s
->sizeof_dyn
)
4210 Elf_Internal_Dyn dyn
;
4212 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4213 if (dyn
.d_tag
== DT_SONAME
)
4215 unsigned int tagv
= dyn
.d_un
.d_val
;
4216 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4218 goto error_free_dyn
;
4220 if (dyn
.d_tag
== DT_NEEDED
)
4222 struct bfd_link_needed_list
*n
, **pn
;
4224 unsigned int tagv
= dyn
.d_un
.d_val
;
4225 size_t amt
= sizeof (struct bfd_link_needed_list
);
4227 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4228 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4229 if (n
== NULL
|| fnm
== NULL
)
4230 goto error_free_dyn
;
4231 amt
= strlen (fnm
) + 1;
4232 anm
= (char *) bfd_alloc (abfd
, amt
);
4234 goto error_free_dyn
;
4235 memcpy (anm
, fnm
, amt
);
4239 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4243 if (dyn
.d_tag
== DT_RUNPATH
)
4245 struct bfd_link_needed_list
*n
, **pn
;
4247 unsigned int tagv
= dyn
.d_un
.d_val
;
4248 size_t amt
= sizeof (struct bfd_link_needed_list
);
4250 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4251 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4252 if (n
== NULL
|| fnm
== NULL
)
4253 goto error_free_dyn
;
4254 amt
= strlen (fnm
) + 1;
4255 anm
= (char *) bfd_alloc (abfd
, amt
);
4257 goto error_free_dyn
;
4258 memcpy (anm
, fnm
, amt
);
4262 for (pn
= & runpath
;
4268 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4269 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4271 struct bfd_link_needed_list
*n
, **pn
;
4273 unsigned int tagv
= dyn
.d_un
.d_val
;
4274 size_t amt
= sizeof (struct bfd_link_needed_list
);
4276 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4277 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4278 if (n
== NULL
|| fnm
== NULL
)
4279 goto error_free_dyn
;
4280 amt
= strlen (fnm
) + 1;
4281 anm
= (char *) bfd_alloc (abfd
, amt
);
4283 goto error_free_dyn
;
4284 memcpy (anm
, fnm
, amt
);
4294 if (dyn
.d_tag
== DT_AUDIT
)
4296 unsigned int tagv
= dyn
.d_un
.d_val
;
4297 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4304 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4305 frees all more recently bfd_alloc'd blocks as well. */
4311 struct bfd_link_needed_list
**pn
;
4312 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4317 /* If we have a PT_GNU_RELRO program header, mark as read-only
4318 all sections contained fully therein. This makes relro
4319 shared library sections appear as they will at run-time. */
4320 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4321 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4322 if (phdr
->p_type
== PT_GNU_RELRO
)
4324 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4326 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4328 if ((s
->flags
& SEC_ALLOC
) != 0
4329 && s
->vma
* opb
>= phdr
->p_vaddr
4330 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4331 s
->flags
|= SEC_READONLY
;
4336 /* We do not want to include any of the sections in a dynamic
4337 object in the output file. We hack by simply clobbering the
4338 list of sections in the BFD. This could be handled more
4339 cleanly by, say, a new section flag; the existing
4340 SEC_NEVER_LOAD flag is not the one we want, because that one
4341 still implies that the section takes up space in the output
4343 bfd_section_list_clear (abfd
);
4345 /* Find the name to use in a DT_NEEDED entry that refers to this
4346 object. If the object has a DT_SONAME entry, we use it.
4347 Otherwise, if the generic linker stuck something in
4348 elf_dt_name, we use that. Otherwise, we just use the file
4350 if (soname
== NULL
|| *soname
== '\0')
4352 soname
= elf_dt_name (abfd
);
4353 if (soname
== NULL
|| *soname
== '\0')
4354 soname
= bfd_get_filename (abfd
);
4357 /* Save the SONAME because sometimes the linker emulation code
4358 will need to know it. */
4359 elf_dt_name (abfd
) = soname
;
4361 /* If we have already included this dynamic object in the
4362 link, just ignore it. There is no reason to include a
4363 particular dynamic object more than once. */
4364 for (loaded_lib
= htab
->dyn_loaded
;
4366 loaded_lib
= loaded_lib
->next
)
4368 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4372 /* Create dynamic sections for backends that require that be done
4373 before setup_gnu_properties. */
4375 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4378 /* Save the DT_AUDIT entry for the linker emulation code. */
4379 elf_dt_audit (abfd
) = audit
;
4382 /* If this is a dynamic object, we always link against the .dynsym
4383 symbol table, not the .symtab symbol table. The dynamic linker
4384 will only see the .dynsym symbol table, so there is no reason to
4385 look at .symtab for a dynamic object. */
4387 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4388 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4390 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4392 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4394 /* The sh_info field of the symtab header tells us where the
4395 external symbols start. We don't care about the local symbols at
4397 if (elf_bad_symtab (abfd
))
4399 extsymcount
= symcount
;
4404 extsymcount
= symcount
- hdr
->sh_info
;
4405 extsymoff
= hdr
->sh_info
;
4408 sym_hash
= elf_sym_hashes (abfd
);
4409 if (extsymcount
!= 0)
4411 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4413 if (isymbuf
== NULL
)
4416 if (sym_hash
== NULL
)
4418 /* We store a pointer to the hash table entry for each
4420 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4421 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4422 if (sym_hash
== NULL
)
4423 goto error_free_sym
;
4424 elf_sym_hashes (abfd
) = sym_hash
;
4430 /* Read in any version definitions. */
4431 if (!_bfd_elf_slurp_version_tables (abfd
,
4432 info
->default_imported_symver
))
4433 goto error_free_sym
;
4435 /* Read in the symbol versions, but don't bother to convert them
4436 to internal format. */
4437 if (elf_dynversym (abfd
) != 0)
4439 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4440 bfd_size_type amt
= versymhdr
->sh_size
;
4442 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4443 goto error_free_sym
;
4444 extversym
= (Elf_External_Versym
*)
4445 _bfd_malloc_and_read (abfd
, amt
, amt
);
4446 if (extversym
== NULL
)
4447 goto error_free_sym
;
4448 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4452 /* If we are loading an as-needed shared lib, save the symbol table
4453 state before we start adding symbols. If the lib turns out
4454 to be unneeded, restore the state. */
4455 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4460 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4462 struct bfd_hash_entry
*p
;
4463 struct elf_link_hash_entry
*h
;
4465 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4467 h
= (struct elf_link_hash_entry
*) p
;
4468 entsize
+= htab
->root
.table
.entsize
;
4469 if (h
->root
.type
== bfd_link_hash_warning
)
4470 entsize
+= htab
->root
.table
.entsize
;
4474 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4475 old_tab
= bfd_malloc (tabsize
+ entsize
);
4476 if (old_tab
== NULL
)
4477 goto error_free_vers
;
4479 /* Remember the current objalloc pointer, so that all mem for
4480 symbols added can later be reclaimed. */
4481 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4482 if (alloc_mark
== NULL
)
4483 goto error_free_vers
;
4485 /* Make a special call to the linker "notice" function to
4486 tell it that we are about to handle an as-needed lib. */
4487 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4488 goto error_free_vers
;
4490 /* Clone the symbol table. Remember some pointers into the
4491 symbol table, and dynamic symbol count. */
4492 old_ent
= (char *) old_tab
+ tabsize
;
4493 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4494 old_undefs
= htab
->root
.undefs
;
4495 old_undefs_tail
= htab
->root
.undefs_tail
;
4496 old_table
= htab
->root
.table
.table
;
4497 old_size
= htab
->root
.table
.size
;
4498 old_count
= htab
->root
.table
.count
;
4500 if (htab
->dynstr
!= NULL
)
4502 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4503 if (old_strtab
== NULL
)
4504 goto error_free_vers
;
4507 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4509 struct bfd_hash_entry
*p
;
4510 struct elf_link_hash_entry
*h
;
4512 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4514 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
4515 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4516 h
= (struct elf_link_hash_entry
*) p
;
4517 if (h
->root
.type
== bfd_link_hash_warning
)
4519 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
4520 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4527 if (extversym
== NULL
)
4529 else if (extversym
+ extsymoff
< extversym_end
)
4530 ever
= extversym
+ extsymoff
;
4533 /* xgettext:c-format */
4534 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4535 abfd
, (long) extsymoff
,
4536 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4537 bfd_set_error (bfd_error_bad_value
);
4538 goto error_free_vers
;
4541 if (!bfd_link_relocatable (info
)
4542 && abfd
->lto_slim_object
)
4545 (_("%pB: plugin needed to handle lto object"), abfd
);
4548 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4550 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4554 asection
*sec
, *new_sec
;
4557 struct elf_link_hash_entry
*h
;
4558 struct elf_link_hash_entry
*hi
;
4559 bfd_boolean definition
;
4560 bfd_boolean size_change_ok
;
4561 bfd_boolean type_change_ok
;
4562 bfd_boolean new_weak
;
4563 bfd_boolean old_weak
;
4564 bfd_boolean override
;
4566 bfd_boolean discarded
;
4567 unsigned int old_alignment
;
4568 unsigned int shindex
;
4570 bfd_boolean matched
;
4574 flags
= BSF_NO_FLAGS
;
4576 value
= isym
->st_value
;
4577 common
= bed
->common_definition (isym
);
4578 if (common
&& info
->inhibit_common_definition
)
4580 /* Treat common symbol as undefined for --no-define-common. */
4581 isym
->st_shndx
= SHN_UNDEF
;
4586 bind
= ELF_ST_BIND (isym
->st_info
);
4590 /* This should be impossible, since ELF requires that all
4591 global symbols follow all local symbols, and that sh_info
4592 point to the first global symbol. Unfortunately, Irix 5
4594 if (elf_bad_symtab (abfd
))
4597 /* If we aren't prepared to handle locals within the globals
4598 then we'll likely segfault on a NULL symbol hash if the
4599 symbol is ever referenced in relocations. */
4600 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4601 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4602 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4603 " (>= sh_info of %lu)"),
4604 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4607 /* Dynamic object relocations are not processed by ld, so
4608 ld won't run into the problem mentioned above. */
4611 bfd_set_error (bfd_error_bad_value
);
4612 goto error_free_vers
;
4615 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4623 case STB_GNU_UNIQUE
:
4624 flags
= BSF_GNU_UNIQUE
;
4628 /* Leave it up to the processor backend. */
4632 if (isym
->st_shndx
== SHN_UNDEF
)
4633 sec
= bfd_und_section_ptr
;
4634 else if (isym
->st_shndx
== SHN_ABS
)
4635 sec
= bfd_abs_section_ptr
;
4636 else if (isym
->st_shndx
== SHN_COMMON
)
4638 sec
= bfd_com_section_ptr
;
4639 /* What ELF calls the size we call the value. What ELF
4640 calls the value we call the alignment. */
4641 value
= isym
->st_size
;
4645 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4647 sec
= bfd_abs_section_ptr
;
4648 else if (discarded_section (sec
))
4650 /* Symbols from discarded section are undefined. We keep
4652 sec
= bfd_und_section_ptr
;
4654 isym
->st_shndx
= SHN_UNDEF
;
4656 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4660 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4663 goto error_free_vers
;
4665 if (isym
->st_shndx
== SHN_COMMON
4666 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4668 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4672 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4674 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4676 goto error_free_vers
;
4680 else if (isym
->st_shndx
== SHN_COMMON
4681 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4682 && !bfd_link_relocatable (info
))
4684 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4688 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4689 | SEC_LINKER_CREATED
);
4690 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4692 goto error_free_vers
;
4696 else if (bed
->elf_add_symbol_hook
)
4698 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4700 goto error_free_vers
;
4702 /* The hook function sets the name to NULL if this symbol
4703 should be skipped for some reason. */
4708 /* Sanity check that all possibilities were handled. */
4712 /* Silently discard TLS symbols from --just-syms. There's
4713 no way to combine a static TLS block with a new TLS block
4714 for this executable. */
4715 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4716 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4719 if (bfd_is_und_section (sec
)
4720 || bfd_is_com_section (sec
))
4725 size_change_ok
= FALSE
;
4726 type_change_ok
= bed
->type_change_ok
;
4733 if (is_elf_hash_table (htab
))
4735 Elf_Internal_Versym iver
;
4736 unsigned int vernum
= 0;
4741 if (info
->default_imported_symver
)
4742 /* Use the default symbol version created earlier. */
4743 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4747 else if (ever
>= extversym_end
)
4749 /* xgettext:c-format */
4750 _bfd_error_handler (_("%pB: not enough version information"),
4752 bfd_set_error (bfd_error_bad_value
);
4753 goto error_free_vers
;
4756 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4758 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4760 /* If this is a hidden symbol, or if it is not version
4761 1, we append the version name to the symbol name.
4762 However, we do not modify a non-hidden absolute symbol
4763 if it is not a function, because it might be the version
4764 symbol itself. FIXME: What if it isn't? */
4765 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4767 && (!bfd_is_abs_section (sec
)
4768 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4771 size_t namelen
, verlen
, newlen
;
4774 if (isym
->st_shndx
!= SHN_UNDEF
)
4776 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4778 else if (vernum
> 1)
4780 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4787 /* xgettext:c-format */
4788 (_("%pB: %s: invalid version %u (max %d)"),
4790 elf_tdata (abfd
)->cverdefs
);
4791 bfd_set_error (bfd_error_bad_value
);
4792 goto error_free_vers
;
4797 /* We cannot simply test for the number of
4798 entries in the VERNEED section since the
4799 numbers for the needed versions do not start
4801 Elf_Internal_Verneed
*t
;
4804 for (t
= elf_tdata (abfd
)->verref
;
4808 Elf_Internal_Vernaux
*a
;
4810 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4812 if (a
->vna_other
== vernum
)
4814 verstr
= a
->vna_nodename
;
4824 /* xgettext:c-format */
4825 (_("%pB: %s: invalid needed version %d"),
4826 abfd
, name
, vernum
);
4827 bfd_set_error (bfd_error_bad_value
);
4828 goto error_free_vers
;
4832 namelen
= strlen (name
);
4833 verlen
= strlen (verstr
);
4834 newlen
= namelen
+ verlen
+ 2;
4835 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4836 && isym
->st_shndx
!= SHN_UNDEF
)
4839 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4840 if (newname
== NULL
)
4841 goto error_free_vers
;
4842 memcpy (newname
, name
, namelen
);
4843 p
= newname
+ namelen
;
4845 /* If this is a defined non-hidden version symbol,
4846 we add another @ to the name. This indicates the
4847 default version of the symbol. */
4848 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4849 && isym
->st_shndx
!= SHN_UNDEF
)
4851 memcpy (p
, verstr
, verlen
+ 1);
4856 /* If this symbol has default visibility and the user has
4857 requested we not re-export it, then mark it as hidden. */
4858 if (!bfd_is_und_section (sec
)
4861 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4862 isym
->st_other
= (STV_HIDDEN
4863 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4865 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4866 sym_hash
, &old_bfd
, &old_weak
,
4867 &old_alignment
, &skip
, &override
,
4868 &type_change_ok
, &size_change_ok
,
4870 goto error_free_vers
;
4875 /* Override a definition only if the new symbol matches the
4877 if (override
&& matched
)
4881 while (h
->root
.type
== bfd_link_hash_indirect
4882 || h
->root
.type
== bfd_link_hash_warning
)
4883 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4885 if (elf_tdata (abfd
)->verdef
!= NULL
4888 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4891 if (! (_bfd_generic_link_add_one_symbol
4892 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4893 (struct bfd_link_hash_entry
**) sym_hash
)))
4894 goto error_free_vers
;
4897 /* We need to make sure that indirect symbol dynamic flags are
4900 while (h
->root
.type
== bfd_link_hash_indirect
4901 || h
->root
.type
== bfd_link_hash_warning
)
4902 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4904 /* Setting the index to -3 tells elf_link_output_extsym that
4905 this symbol is defined in a discarded section. */
4911 new_weak
= (flags
& BSF_WEAK
) != 0;
4915 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4916 && is_elf_hash_table (htab
)
4917 && h
->u
.alias
== NULL
)
4919 /* Keep a list of all weak defined non function symbols from
4920 a dynamic object, using the alias field. Later in this
4921 function we will set the alias field to the correct
4922 value. We only put non-function symbols from dynamic
4923 objects on this list, because that happens to be the only
4924 time we need to know the normal symbol corresponding to a
4925 weak symbol, and the information is time consuming to
4926 figure out. If the alias field is not already NULL,
4927 then this symbol was already defined by some previous
4928 dynamic object, and we will be using that previous
4929 definition anyhow. */
4935 /* Set the alignment of a common symbol. */
4936 if ((common
|| bfd_is_com_section (sec
))
4937 && h
->root
.type
== bfd_link_hash_common
)
4942 align
= bfd_log2 (isym
->st_value
);
4945 /* The new symbol is a common symbol in a shared object.
4946 We need to get the alignment from the section. */
4947 align
= new_sec
->alignment_power
;
4949 if (align
> old_alignment
)
4950 h
->root
.u
.c
.p
->alignment_power
= align
;
4952 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4955 if (is_elf_hash_table (htab
))
4957 /* Set a flag in the hash table entry indicating the type of
4958 reference or definition we just found. A dynamic symbol
4959 is one which is referenced or defined by both a regular
4960 object and a shared object. */
4961 bfd_boolean dynsym
= FALSE
;
4963 /* Plugin symbols aren't normal. Don't set def_regular or
4964 ref_regular for them, or make them dynamic. */
4965 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4972 if (bind
!= STB_WEAK
)
4973 h
->ref_regular_nonweak
= 1;
4985 /* If the indirect symbol has been forced local, don't
4986 make the real symbol dynamic. */
4987 if ((h
== hi
|| !hi
->forced_local
)
4988 && (bfd_link_dll (info
)
4998 hi
->ref_dynamic
= 1;
5003 hi
->def_dynamic
= 1;
5006 /* If the indirect symbol has been forced local, don't
5007 make the real symbol dynamic. */
5008 if ((h
== hi
|| !hi
->forced_local
)
5012 && weakdef (h
)->dynindx
!= -1)))
5016 /* Check to see if we need to add an indirect symbol for
5017 the default name. */
5019 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5020 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5021 sec
, value
, &old_bfd
, &dynsym
))
5022 goto error_free_vers
;
5024 /* Check the alignment when a common symbol is involved. This
5025 can change when a common symbol is overridden by a normal
5026 definition or a common symbol is ignored due to the old
5027 normal definition. We need to make sure the maximum
5028 alignment is maintained. */
5029 if ((old_alignment
|| common
)
5030 && h
->root
.type
!= bfd_link_hash_common
)
5032 unsigned int common_align
;
5033 unsigned int normal_align
;
5034 unsigned int symbol_align
;
5038 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5039 || h
->root
.type
== bfd_link_hash_defweak
);
5041 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5042 if (h
->root
.u
.def
.section
->owner
!= NULL
5043 && (h
->root
.u
.def
.section
->owner
->flags
5044 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5046 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5047 if (normal_align
> symbol_align
)
5048 normal_align
= symbol_align
;
5051 normal_align
= symbol_align
;
5055 common_align
= old_alignment
;
5056 common_bfd
= old_bfd
;
5061 common_align
= bfd_log2 (isym
->st_value
);
5063 normal_bfd
= old_bfd
;
5066 if (normal_align
< common_align
)
5068 /* PR binutils/2735 */
5069 if (normal_bfd
== NULL
)
5071 /* xgettext:c-format */
5072 (_("warning: alignment %u of common symbol `%s' in %pB is"
5073 " greater than the alignment (%u) of its section %pA"),
5074 1 << common_align
, name
, common_bfd
,
5075 1 << normal_align
, h
->root
.u
.def
.section
);
5078 /* xgettext:c-format */
5079 (_("warning: alignment %u of symbol `%s' in %pB"
5080 " is smaller than %u in %pB"),
5081 1 << normal_align
, name
, normal_bfd
,
5082 1 << common_align
, common_bfd
);
5086 /* Remember the symbol size if it isn't undefined. */
5087 if (isym
->st_size
!= 0
5088 && isym
->st_shndx
!= SHN_UNDEF
5089 && (definition
|| h
->size
== 0))
5092 && h
->size
!= isym
->st_size
5093 && ! size_change_ok
)
5095 /* xgettext:c-format */
5096 (_("warning: size of symbol `%s' changed"
5097 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5098 name
, (uint64_t) h
->size
, old_bfd
,
5099 (uint64_t) isym
->st_size
, abfd
);
5101 h
->size
= isym
->st_size
;
5104 /* If this is a common symbol, then we always want H->SIZE
5105 to be the size of the common symbol. The code just above
5106 won't fix the size if a common symbol becomes larger. We
5107 don't warn about a size change here, because that is
5108 covered by --warn-common. Allow changes between different
5110 if (h
->root
.type
== bfd_link_hash_common
)
5111 h
->size
= h
->root
.u
.c
.size
;
5113 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5114 && ((definition
&& !new_weak
)
5115 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5116 || h
->type
== STT_NOTYPE
))
5118 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5120 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5122 if (type
== STT_GNU_IFUNC
5123 && (abfd
->flags
& DYNAMIC
) != 0)
5126 if (h
->type
!= type
)
5128 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5129 /* xgettext:c-format */
5131 (_("warning: type of symbol `%s' changed"
5132 " from %d to %d in %pB"),
5133 name
, h
->type
, type
, abfd
);
5139 /* Merge st_other field. */
5140 elf_merge_st_other (abfd
, h
, isym
, sec
, definition
, dynamic
);
5142 /* We don't want to make debug symbol dynamic. */
5144 && (sec
->flags
& SEC_DEBUGGING
)
5145 && !bfd_link_relocatable (info
))
5148 /* Nor should we make plugin symbols dynamic. */
5149 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5154 h
->target_internal
= isym
->st_target_internal
;
5155 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5158 if (definition
&& !dynamic
)
5160 char *p
= strchr (name
, ELF_VER_CHR
);
5161 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5163 /* Queue non-default versions so that .symver x, x@FOO
5164 aliases can be checked. */
5167 size_t amt
= ((isymend
- isym
+ 1)
5168 * sizeof (struct elf_link_hash_entry
*));
5170 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5172 goto error_free_vers
;
5174 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5178 if (dynsym
&& h
->dynindx
== -1)
5180 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5181 goto error_free_vers
;
5183 && weakdef (h
)->dynindx
== -1)
5185 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5186 goto error_free_vers
;
5189 else if (h
->dynindx
!= -1)
5190 /* If the symbol already has a dynamic index, but
5191 visibility says it should not be visible, turn it into
5193 switch (ELF_ST_VISIBILITY (h
->other
))
5197 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
5202 /* Don't add DT_NEEDED for references from the dummy bfd nor
5203 for unmatched symbol. */
5208 && h
->ref_regular_nonweak
5210 || (old_bfd
->flags
& BFD_PLUGIN
) == 0))
5211 || (h
->ref_dynamic_nonweak
5212 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5213 && !on_needed_list (elf_dt_name (abfd
),
5214 htab
->needed
, NULL
))))
5216 const char *soname
= elf_dt_name (abfd
);
5218 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5219 h
->root
.root
.string
);
5221 /* A symbol from a library loaded via DT_NEEDED of some
5222 other library is referenced by a regular object.
5223 Add a DT_NEEDED entry for it. Issue an error if
5224 --no-add-needed is used and the reference was not
5227 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5230 /* xgettext:c-format */
5231 (_("%pB: undefined reference to symbol '%s'"),
5233 bfd_set_error (bfd_error_missing_dso
);
5234 goto error_free_vers
;
5237 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5238 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5240 /* Create dynamic sections for backends that require
5241 that be done before setup_gnu_properties. */
5242 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5249 if (info
->lto_plugin_active
5250 && !bfd_link_relocatable (info
)
5251 && (abfd
->flags
& BFD_PLUGIN
) == 0
5257 if (bed
->s
->arch_size
== 32)
5262 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5263 referenced in regular objects so that linker plugin will get
5264 the correct symbol resolution. */
5266 sym_hash
= elf_sym_hashes (abfd
);
5267 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5269 Elf_Internal_Rela
*internal_relocs
;
5270 Elf_Internal_Rela
*rel
, *relend
;
5272 /* Don't check relocations in excluded sections. */
5273 if ((s
->flags
& SEC_RELOC
) == 0
5274 || s
->reloc_count
== 0
5275 || (s
->flags
& SEC_EXCLUDE
) != 0
5276 || ((info
->strip
== strip_all
5277 || info
->strip
== strip_debugger
)
5278 && (s
->flags
& SEC_DEBUGGING
) != 0))
5281 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5284 if (internal_relocs
== NULL
)
5285 goto error_free_vers
;
5287 rel
= internal_relocs
;
5288 relend
= rel
+ s
->reloc_count
;
5289 for ( ; rel
< relend
; rel
++)
5291 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5292 struct elf_link_hash_entry
*h
;
5294 /* Skip local symbols. */
5295 if (r_symndx
< extsymoff
)
5298 h
= sym_hash
[r_symndx
- extsymoff
];
5300 h
->root
.non_ir_ref_regular
= 1;
5303 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5304 free (internal_relocs
);
5313 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5317 /* Restore the symbol table. */
5318 old_ent
= (char *) old_tab
+ tabsize
;
5319 memset (elf_sym_hashes (abfd
), 0,
5320 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5321 htab
->root
.table
.table
= old_table
;
5322 htab
->root
.table
.size
= old_size
;
5323 htab
->root
.table
.count
= old_count
;
5324 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5325 htab
->root
.undefs
= old_undefs
;
5326 htab
->root
.undefs_tail
= old_undefs_tail
;
5327 if (htab
->dynstr
!= NULL
)
5328 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5331 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5333 struct bfd_hash_entry
*p
;
5334 struct elf_link_hash_entry
*h
;
5336 unsigned int alignment_power
;
5337 unsigned int non_ir_ref_dynamic
;
5339 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5341 h
= (struct elf_link_hash_entry
*) p
;
5342 if (h
->root
.type
== bfd_link_hash_warning
)
5343 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5345 /* Preserve the maximum alignment and size for common
5346 symbols even if this dynamic lib isn't on DT_NEEDED
5347 since it can still be loaded at run time by another
5349 if (h
->root
.type
== bfd_link_hash_common
)
5351 size
= h
->root
.u
.c
.size
;
5352 alignment_power
= h
->root
.u
.c
.p
->alignment_power
;
5357 alignment_power
= 0;
5359 /* Preserve non_ir_ref_dynamic so that this symbol
5360 will be exported when the dynamic lib becomes needed
5361 in the second pass. */
5362 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5363 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
5364 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5365 h
= (struct elf_link_hash_entry
*) p
;
5366 if (h
->root
.type
== bfd_link_hash_warning
)
5368 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
5369 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5370 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5372 if (h
->root
.type
== bfd_link_hash_common
)
5374 if (size
> h
->root
.u
.c
.size
)
5375 h
->root
.u
.c
.size
= size
;
5376 if (alignment_power
> h
->root
.u
.c
.p
->alignment_power
)
5377 h
->root
.u
.c
.p
->alignment_power
= alignment_power
;
5379 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5383 /* Make a special call to the linker "notice" function to
5384 tell it that symbols added for crefs may need to be removed. */
5385 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5386 goto error_free_vers
;
5389 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5391 free (nondeflt_vers
);
5395 if (old_tab
!= NULL
)
5397 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5398 goto error_free_vers
;
5403 /* Now that all the symbols from this input file are created, if
5404 not performing a relocatable link, handle .symver foo, foo@BAR
5405 such that any relocs against foo become foo@BAR. */
5406 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5410 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5412 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5413 char *shortname
, *p
;
5416 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5418 || (h
->root
.type
!= bfd_link_hash_defined
5419 && h
->root
.type
!= bfd_link_hash_defweak
))
5422 amt
= p
- h
->root
.root
.string
;
5423 shortname
= (char *) bfd_malloc (amt
+ 1);
5425 goto error_free_vers
;
5426 memcpy (shortname
, h
->root
.root
.string
, amt
);
5427 shortname
[amt
] = '\0';
5429 hi
= (struct elf_link_hash_entry
*)
5430 bfd_link_hash_lookup (&htab
->root
, shortname
,
5431 FALSE
, FALSE
, FALSE
);
5433 && hi
->root
.type
== h
->root
.type
5434 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5435 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5437 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
5438 hi
->root
.type
= bfd_link_hash_indirect
;
5439 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5440 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5441 sym_hash
= elf_sym_hashes (abfd
);
5443 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5444 if (sym_hash
[symidx
] == hi
)
5446 sym_hash
[symidx
] = h
;
5452 free (nondeflt_vers
);
5453 nondeflt_vers
= NULL
;
5456 /* Now set the alias field correctly for all the weak defined
5457 symbols we found. The only way to do this is to search all the
5458 symbols. Since we only need the information for non functions in
5459 dynamic objects, that's the only time we actually put anything on
5460 the list WEAKS. We need this information so that if a regular
5461 object refers to a symbol defined weakly in a dynamic object, the
5462 real symbol in the dynamic object is also put in the dynamic
5463 symbols; we also must arrange for both symbols to point to the
5464 same memory location. We could handle the general case of symbol
5465 aliasing, but a general symbol alias can only be generated in
5466 assembler code, handling it correctly would be very time
5467 consuming, and other ELF linkers don't handle general aliasing
5471 struct elf_link_hash_entry
**hpp
;
5472 struct elf_link_hash_entry
**hppend
;
5473 struct elf_link_hash_entry
**sorted_sym_hash
;
5474 struct elf_link_hash_entry
*h
;
5475 size_t sym_count
, amt
;
5477 /* Since we have to search the whole symbol list for each weak
5478 defined symbol, search time for N weak defined symbols will be
5479 O(N^2). Binary search will cut it down to O(NlogN). */
5480 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5481 sorted_sym_hash
= bfd_malloc (amt
);
5482 if (sorted_sym_hash
== NULL
)
5484 sym_hash
= sorted_sym_hash
;
5485 hpp
= elf_sym_hashes (abfd
);
5486 hppend
= hpp
+ extsymcount
;
5488 for (; hpp
< hppend
; hpp
++)
5492 && h
->root
.type
== bfd_link_hash_defined
5493 && !bed
->is_function_type (h
->type
))
5501 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5504 while (weaks
!= NULL
)
5506 struct elf_link_hash_entry
*hlook
;
5509 size_t i
, j
, idx
= 0;
5512 weaks
= hlook
->u
.alias
;
5513 hlook
->u
.alias
= NULL
;
5515 if (hlook
->root
.type
!= bfd_link_hash_defined
5516 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5519 slook
= hlook
->root
.u
.def
.section
;
5520 vlook
= hlook
->root
.u
.def
.value
;
5526 bfd_signed_vma vdiff
;
5528 h
= sorted_sym_hash
[idx
];
5529 vdiff
= vlook
- h
->root
.u
.def
.value
;
5536 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5546 /* We didn't find a value/section match. */
5550 /* With multiple aliases, or when the weak symbol is already
5551 strongly defined, we have multiple matching symbols and
5552 the binary search above may land on any of them. Step
5553 one past the matching symbol(s). */
5556 h
= sorted_sym_hash
[idx
];
5557 if (h
->root
.u
.def
.section
!= slook
5558 || h
->root
.u
.def
.value
!= vlook
)
5562 /* Now look back over the aliases. Since we sorted by size
5563 as well as value and section, we'll choose the one with
5564 the largest size. */
5567 h
= sorted_sym_hash
[idx
];
5569 /* Stop if value or section doesn't match. */
5570 if (h
->root
.u
.def
.section
!= slook
5571 || h
->root
.u
.def
.value
!= vlook
)
5573 else if (h
!= hlook
)
5575 struct elf_link_hash_entry
*t
;
5578 hlook
->is_weakalias
= 1;
5580 if (t
->u
.alias
!= NULL
)
5581 while (t
->u
.alias
!= h
)
5585 /* If the weak definition is in the list of dynamic
5586 symbols, make sure the real definition is put
5588 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5590 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5593 free (sorted_sym_hash
);
5598 /* If the real definition is in the list of dynamic
5599 symbols, make sure the weak definition is put
5600 there as well. If we don't do this, then the
5601 dynamic loader might not merge the entries for the
5602 real definition and the weak definition. */
5603 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5605 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5606 goto err_free_sym_hash
;
5613 free (sorted_sym_hash
);
5616 if (bed
->check_directives
5617 && !(*bed
->check_directives
) (abfd
, info
))
5620 /* If this is a non-traditional link, try to optimize the handling
5621 of the .stab/.stabstr sections. */
5623 && ! info
->traditional_format
5624 && is_elf_hash_table (htab
)
5625 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5629 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5630 if (stabstr
!= NULL
)
5632 bfd_size_type string_offset
= 0;
5635 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5636 if (CONST_STRNEQ (stab
->name
, ".stab")
5637 && (!stab
->name
[5] ||
5638 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5639 && (stab
->flags
& SEC_MERGE
) == 0
5640 && !bfd_is_abs_section (stab
->output_section
))
5642 struct bfd_elf_section_data
*secdata
;
5644 secdata
= elf_section_data (stab
);
5645 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5646 stabstr
, &secdata
->sec_info
,
5649 if (secdata
->sec_info
)
5650 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5655 if (dynamic
&& add_needed
)
5657 /* Add this bfd to the loaded list. */
5658 struct elf_link_loaded_list
*n
;
5660 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5664 n
->next
= htab
->dyn_loaded
;
5665 htab
->dyn_loaded
= n
;
5667 if (dynamic
&& !add_needed
5668 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5669 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5676 free (nondeflt_vers
);
5684 /* Return the linker hash table entry of a symbol that might be
5685 satisfied by an archive symbol. Return -1 on error. */
5687 struct elf_link_hash_entry
*
5688 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5689 struct bfd_link_info
*info
,
5692 struct elf_link_hash_entry
*h
;
5696 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
5700 /* If this is a default version (the name contains @@), look up the
5701 symbol again with only one `@' as well as without the version.
5702 The effect is that references to the symbol with and without the
5703 version will be matched by the default symbol in the archive. */
5705 p
= strchr (name
, ELF_VER_CHR
);
5706 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5709 /* First check with only one `@'. */
5710 len
= strlen (name
);
5711 copy
= (char *) bfd_alloc (abfd
, len
);
5713 return (struct elf_link_hash_entry
*) -1;
5715 first
= p
- name
+ 1;
5716 memcpy (copy
, name
, first
);
5717 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5719 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
5722 /* We also need to check references to the symbol without the
5724 copy
[first
- 1] = '\0';
5725 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5726 FALSE
, FALSE
, TRUE
);
5729 bfd_release (abfd
, copy
);
5733 /* Add symbols from an ELF archive file to the linker hash table. We
5734 don't use _bfd_generic_link_add_archive_symbols because we need to
5735 handle versioned symbols.
5737 Fortunately, ELF archive handling is simpler than that done by
5738 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5739 oddities. In ELF, if we find a symbol in the archive map, and the
5740 symbol is currently undefined, we know that we must pull in that
5743 Unfortunately, we do have to make multiple passes over the symbol
5744 table until nothing further is resolved. */
5747 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5750 unsigned char *included
= NULL
;
5754 const struct elf_backend_data
*bed
;
5755 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5756 (bfd
*, struct bfd_link_info
*, const char *);
5758 if (! bfd_has_map (abfd
))
5760 /* An empty archive is a special case. */
5761 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5763 bfd_set_error (bfd_error_no_armap
);
5767 /* Keep track of all symbols we know to be already defined, and all
5768 files we know to be already included. This is to speed up the
5769 second and subsequent passes. */
5770 c
= bfd_ardata (abfd
)->symdef_count
;
5773 amt
= c
* sizeof (*included
);
5774 included
= (unsigned char *) bfd_zmalloc (amt
);
5775 if (included
== NULL
)
5778 symdefs
= bfd_ardata (abfd
)->symdefs
;
5779 bed
= get_elf_backend_data (abfd
);
5780 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5793 symdefend
= symdef
+ c
;
5794 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5796 struct elf_link_hash_entry
*h
;
5798 struct bfd_link_hash_entry
*undefs_tail
;
5803 if (symdef
->file_offset
== last
)
5809 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5810 if (h
== (struct elf_link_hash_entry
*) -1)
5816 if (h
->root
.type
== bfd_link_hash_common
)
5818 /* We currently have a common symbol. The archive map contains
5819 a reference to this symbol, so we may want to include it. We
5820 only want to include it however, if this archive element
5821 contains a definition of the symbol, not just another common
5824 Unfortunately some archivers (including GNU ar) will put
5825 declarations of common symbols into their archive maps, as
5826 well as real definitions, so we cannot just go by the archive
5827 map alone. Instead we must read in the element's symbol
5828 table and check that to see what kind of symbol definition
5830 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5833 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5835 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5836 /* Symbol must be defined. Don't check it again. */
5841 /* We need to include this archive member. */
5842 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5843 if (element
== NULL
)
5846 if (! bfd_check_format (element
, bfd_object
))
5849 undefs_tail
= info
->hash
->undefs_tail
;
5851 if (!(*info
->callbacks
5852 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5854 if (!bfd_link_add_symbols (element
, info
))
5857 /* If there are any new undefined symbols, we need to make
5858 another pass through the archive in order to see whether
5859 they can be defined. FIXME: This isn't perfect, because
5860 common symbols wind up on undefs_tail and because an
5861 undefined symbol which is defined later on in this pass
5862 does not require another pass. This isn't a bug, but it
5863 does make the code less efficient than it could be. */
5864 if (undefs_tail
!= info
->hash
->undefs_tail
)
5867 /* Look backward to mark all symbols from this object file
5868 which we have already seen in this pass. */
5872 included
[mark
] = TRUE
;
5877 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5879 /* We mark subsequent symbols from this object file as we go
5880 on through the loop. */
5881 last
= symdef
->file_offset
;
5894 /* Given an ELF BFD, add symbols to the global hash table as
5898 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5900 switch (bfd_get_format (abfd
))
5903 return elf_link_add_object_symbols (abfd
, info
);
5905 return elf_link_add_archive_symbols (abfd
, info
);
5907 bfd_set_error (bfd_error_wrong_format
);
5912 struct hash_codes_info
5914 unsigned long *hashcodes
;
5918 /* This function will be called though elf_link_hash_traverse to store
5919 all hash value of the exported symbols in an array. */
5922 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5924 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5929 /* Ignore indirect symbols. These are added by the versioning code. */
5930 if (h
->dynindx
== -1)
5933 name
= h
->root
.root
.string
;
5934 if (h
->versioned
>= versioned
)
5936 char *p
= strchr (name
, ELF_VER_CHR
);
5939 alc
= (char *) bfd_malloc (p
- name
+ 1);
5945 memcpy (alc
, name
, p
- name
);
5946 alc
[p
- name
] = '\0';
5951 /* Compute the hash value. */
5952 ha
= bfd_elf_hash (name
);
5954 /* Store the found hash value in the array given as the argument. */
5955 *(inf
->hashcodes
)++ = ha
;
5957 /* And store it in the struct so that we can put it in the hash table
5959 h
->u
.elf_hash_value
= ha
;
5965 struct collect_gnu_hash_codes
5968 const struct elf_backend_data
*bed
;
5969 unsigned long int nsyms
;
5970 unsigned long int maskbits
;
5971 unsigned long int *hashcodes
;
5972 unsigned long int *hashval
;
5973 unsigned long int *indx
;
5974 unsigned long int *counts
;
5978 long int min_dynindx
;
5979 unsigned long int bucketcount
;
5980 unsigned long int symindx
;
5981 long int local_indx
;
5982 long int shift1
, shift2
;
5983 unsigned long int mask
;
5987 /* This function will be called though elf_link_hash_traverse to store
5988 all hash value of the exported symbols in an array. */
5991 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5993 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5998 /* Ignore indirect symbols. These are added by the versioning code. */
5999 if (h
->dynindx
== -1)
6002 /* Ignore also local symbols and undefined symbols. */
6003 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6006 name
= h
->root
.root
.string
;
6007 if (h
->versioned
>= versioned
)
6009 char *p
= strchr (name
, ELF_VER_CHR
);
6012 alc
= (char *) bfd_malloc (p
- name
+ 1);
6018 memcpy (alc
, name
, p
- name
);
6019 alc
[p
- name
] = '\0';
6024 /* Compute the hash value. */
6025 ha
= bfd_elf_gnu_hash (name
);
6027 /* Store the found hash value in the array for compute_bucket_count,
6028 and also for .dynsym reordering purposes. */
6029 s
->hashcodes
[s
->nsyms
] = ha
;
6030 s
->hashval
[h
->dynindx
] = ha
;
6032 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6033 s
->min_dynindx
= h
->dynindx
;
6039 /* This function will be called though elf_link_hash_traverse to do
6040 final dynamic symbol renumbering in case of .gnu.hash.
6041 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6042 to the translation table. */
6045 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6047 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6048 unsigned long int bucket
;
6049 unsigned long int val
;
6051 /* Ignore indirect symbols. */
6052 if (h
->dynindx
== -1)
6055 /* Ignore also local symbols and undefined symbols. */
6056 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6058 if (h
->dynindx
>= s
->min_dynindx
)
6060 if (s
->bed
->record_xhash_symbol
!= NULL
)
6062 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6066 h
->dynindx
= s
->local_indx
++;
6071 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6072 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6073 & ((s
->maskbits
>> s
->shift1
) - 1);
6074 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6076 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6077 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6078 if (s
->counts
[bucket
] == 1)
6079 /* Last element terminates the chain. */
6081 bfd_put_32 (s
->output_bfd
, val
,
6082 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6083 --s
->counts
[bucket
];
6084 if (s
->bed
->record_xhash_symbol
!= NULL
)
6086 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6088 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6091 h
->dynindx
= s
->indx
[bucket
]++;
6095 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6098 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6100 return !(h
->forced_local
6101 || h
->root
.type
== bfd_link_hash_undefined
6102 || h
->root
.type
== bfd_link_hash_undefweak
6103 || ((h
->root
.type
== bfd_link_hash_defined
6104 || h
->root
.type
== bfd_link_hash_defweak
)
6105 && h
->root
.u
.def
.section
->output_section
== NULL
));
6108 /* Array used to determine the number of hash table buckets to use
6109 based on the number of symbols there are. If there are fewer than
6110 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6111 fewer than 37 we use 17 buckets, and so forth. We never use more
6112 than 32771 buckets. */
6114 static const size_t elf_buckets
[] =
6116 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6120 /* Compute bucket count for hashing table. We do not use a static set
6121 of possible tables sizes anymore. Instead we determine for all
6122 possible reasonable sizes of the table the outcome (i.e., the
6123 number of collisions etc) and choose the best solution. The
6124 weighting functions are not too simple to allow the table to grow
6125 without bounds. Instead one of the weighting factors is the size.
6126 Therefore the result is always a good payoff between few collisions
6127 (= short chain lengths) and table size. */
6129 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6130 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6131 unsigned long int nsyms
,
6134 size_t best_size
= 0;
6135 unsigned long int i
;
6137 /* We have a problem here. The following code to optimize the table
6138 size requires an integer type with more the 32 bits. If
6139 BFD_HOST_U_64_BIT is set we know about such a type. */
6140 #ifdef BFD_HOST_U_64_BIT
6145 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6146 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6147 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6148 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6149 unsigned long int *counts
;
6151 unsigned int no_improvement_count
= 0;
6153 /* Possible optimization parameters: if we have NSYMS symbols we say
6154 that the hashing table must at least have NSYMS/4 and at most
6156 minsize
= nsyms
/ 4;
6159 best_size
= maxsize
= nsyms
* 2;
6164 if ((best_size
& 31) == 0)
6168 /* Create array where we count the collisions in. We must use bfd_malloc
6169 since the size could be large. */
6171 amt
*= sizeof (unsigned long int);
6172 counts
= (unsigned long int *) bfd_malloc (amt
);
6176 /* Compute the "optimal" size for the hash table. The criteria is a
6177 minimal chain length. The minor criteria is (of course) the size
6179 for (i
= minsize
; i
< maxsize
; ++i
)
6181 /* Walk through the array of hashcodes and count the collisions. */
6182 BFD_HOST_U_64_BIT max
;
6183 unsigned long int j
;
6184 unsigned long int fact
;
6186 if (gnu_hash
&& (i
& 31) == 0)
6189 memset (counts
, '\0', i
* sizeof (unsigned long int));
6191 /* Determine how often each hash bucket is used. */
6192 for (j
= 0; j
< nsyms
; ++j
)
6193 ++counts
[hashcodes
[j
] % i
];
6195 /* For the weight function we need some information about the
6196 pagesize on the target. This is information need not be 100%
6197 accurate. Since this information is not available (so far) we
6198 define it here to a reasonable default value. If it is crucial
6199 to have a better value some day simply define this value. */
6200 # ifndef BFD_TARGET_PAGESIZE
6201 # define BFD_TARGET_PAGESIZE (4096)
6204 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6206 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6209 /* Variant 1: optimize for short chains. We add the squares
6210 of all the chain lengths (which favors many small chain
6211 over a few long chains). */
6212 for (j
= 0; j
< i
; ++j
)
6213 max
+= counts
[j
] * counts
[j
];
6215 /* This adds penalties for the overall size of the table. */
6216 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6219 /* Variant 2: Optimize a lot more for small table. Here we
6220 also add squares of the size but we also add penalties for
6221 empty slots (the +1 term). */
6222 for (j
= 0; j
< i
; ++j
)
6223 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6225 /* The overall size of the table is considered, but not as
6226 strong as in variant 1, where it is squared. */
6227 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6231 /* Compare with current best results. */
6232 if (max
< best_chlen
)
6236 no_improvement_count
= 0;
6238 /* PR 11843: Avoid futile long searches for the best bucket size
6239 when there are a large number of symbols. */
6240 else if (++no_improvement_count
== 100)
6247 #endif /* defined (BFD_HOST_U_64_BIT) */
6249 /* This is the fallback solution if no 64bit type is available or if we
6250 are not supposed to spend much time on optimizations. We select the
6251 bucket count using a fixed set of numbers. */
6252 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6254 best_size
= elf_buckets
[i
];
6255 if (nsyms
< elf_buckets
[i
+ 1])
6258 if (gnu_hash
&& best_size
< 2)
6265 /* Size any SHT_GROUP section for ld -r. */
6268 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6273 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6274 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6275 && (s
= ibfd
->sections
) != NULL
6276 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6277 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6282 /* Set a default stack segment size. The value in INFO wins. If it
6283 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6284 undefined it is initialized. */
6287 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6288 struct bfd_link_info
*info
,
6289 const char *legacy_symbol
,
6290 bfd_vma default_size
)
6292 struct elf_link_hash_entry
*h
= NULL
;
6294 /* Look for legacy symbol. */
6296 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6297 FALSE
, FALSE
, FALSE
);
6298 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6299 || h
->root
.type
== bfd_link_hash_defweak
)
6301 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6303 /* The symbol has no type if specified on the command line. */
6304 h
->type
= STT_OBJECT
;
6305 if (info
->stacksize
)
6306 /* xgettext:c-format */
6307 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6308 output_bfd
, legacy_symbol
);
6309 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6310 /* xgettext:c-format */
6311 _bfd_error_handler (_("%pB: %s not absolute"),
6312 output_bfd
, legacy_symbol
);
6314 info
->stacksize
= h
->root
.u
.def
.value
;
6317 if (!info
->stacksize
)
6318 /* If the user didn't set a size, or explicitly inhibit the
6319 size, set it now. */
6320 info
->stacksize
= default_size
;
6322 /* Provide the legacy symbol, if it is referenced. */
6323 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6324 || h
->root
.type
== bfd_link_hash_undefweak
))
6326 struct bfd_link_hash_entry
*bh
= NULL
;
6328 if (!(_bfd_generic_link_add_one_symbol
6329 (info
, output_bfd
, legacy_symbol
,
6330 BSF_GLOBAL
, bfd_abs_section_ptr
,
6331 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6332 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6335 h
= (struct elf_link_hash_entry
*) bh
;
6337 h
->type
= STT_OBJECT
;
6343 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6345 struct elf_gc_sweep_symbol_info
6347 struct bfd_link_info
*info
;
6348 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6353 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6356 && (((h
->root
.type
== bfd_link_hash_defined
6357 || h
->root
.type
== bfd_link_hash_defweak
)
6358 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6359 && h
->root
.u
.def
.section
->gc_mark
))
6360 || h
->root
.type
== bfd_link_hash_undefined
6361 || h
->root
.type
== bfd_link_hash_undefweak
))
6363 struct elf_gc_sweep_symbol_info
*inf
;
6365 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6366 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
6369 h
->ref_regular_nonweak
= 0;
6375 /* Set up the sizes and contents of the ELF dynamic sections. This is
6376 called by the ELF linker emulation before_allocation routine. We
6377 must set the sizes of the sections before the linker sets the
6378 addresses of the various sections. */
6381 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6384 const char *filter_shlib
,
6386 const char *depaudit
,
6387 const char * const *auxiliary_filters
,
6388 struct bfd_link_info
*info
,
6389 asection
**sinterpptr
)
6392 const struct elf_backend_data
*bed
;
6396 if (!is_elf_hash_table (info
->hash
))
6399 dynobj
= elf_hash_table (info
)->dynobj
;
6401 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6403 struct bfd_elf_version_tree
*verdefs
;
6404 struct elf_info_failed asvinfo
;
6405 struct bfd_elf_version_tree
*t
;
6406 struct bfd_elf_version_expr
*d
;
6410 /* If we are supposed to export all symbols into the dynamic symbol
6411 table (this is not the normal case), then do so. */
6412 if (info
->export_dynamic
6413 || (bfd_link_executable (info
) && info
->dynamic
))
6415 struct elf_info_failed eif
;
6419 elf_link_hash_traverse (elf_hash_table (info
),
6420 _bfd_elf_export_symbol
,
6428 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6430 if (soname_indx
== (size_t) -1
6431 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6435 soname_indx
= (size_t) -1;
6437 /* Make all global versions with definition. */
6438 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6439 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6440 if (!d
->symver
&& d
->literal
)
6442 const char *verstr
, *name
;
6443 size_t namelen
, verlen
, newlen
;
6444 char *newname
, *p
, leading_char
;
6445 struct elf_link_hash_entry
*newh
;
6447 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6449 namelen
= strlen (name
) + (leading_char
!= '\0');
6451 verlen
= strlen (verstr
);
6452 newlen
= namelen
+ verlen
+ 3;
6454 newname
= (char *) bfd_malloc (newlen
);
6455 if (newname
== NULL
)
6457 newname
[0] = leading_char
;
6458 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6460 /* Check the hidden versioned definition. */
6461 p
= newname
+ namelen
;
6463 memcpy (p
, verstr
, verlen
+ 1);
6464 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6465 newname
, FALSE
, FALSE
,
6468 || (newh
->root
.type
!= bfd_link_hash_defined
6469 && newh
->root
.type
!= bfd_link_hash_defweak
))
6471 /* Check the default versioned definition. */
6473 memcpy (p
, verstr
, verlen
+ 1);
6474 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6475 newname
, FALSE
, FALSE
,
6480 /* Mark this version if there is a definition and it is
6481 not defined in a shared object. */
6483 && !newh
->def_dynamic
6484 && (newh
->root
.type
== bfd_link_hash_defined
6485 || newh
->root
.type
== bfd_link_hash_defweak
))
6489 /* Attach all the symbols to their version information. */
6490 asvinfo
.info
= info
;
6491 asvinfo
.failed
= FALSE
;
6493 elf_link_hash_traverse (elf_hash_table (info
),
6494 _bfd_elf_link_assign_sym_version
,
6499 if (!info
->allow_undefined_version
)
6501 /* Check if all global versions have a definition. */
6502 bfd_boolean all_defined
= TRUE
;
6503 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6504 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6505 if (d
->literal
&& !d
->symver
&& !d
->script
)
6508 (_("%s: undefined version: %s"),
6509 d
->pattern
, t
->name
);
6510 all_defined
= FALSE
;
6515 bfd_set_error (bfd_error_bad_value
);
6520 /* Set up the version definition section. */
6521 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6522 BFD_ASSERT (s
!= NULL
);
6524 /* We may have created additional version definitions if we are
6525 just linking a regular application. */
6526 verdefs
= info
->version_info
;
6528 /* Skip anonymous version tag. */
6529 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6530 verdefs
= verdefs
->next
;
6532 if (verdefs
== NULL
&& !info
->create_default_symver
)
6533 s
->flags
|= SEC_EXCLUDE
;
6539 Elf_Internal_Verdef def
;
6540 Elf_Internal_Verdaux defaux
;
6541 struct bfd_link_hash_entry
*bh
;
6542 struct elf_link_hash_entry
*h
;
6548 /* Make space for the base version. */
6549 size
+= sizeof (Elf_External_Verdef
);
6550 size
+= sizeof (Elf_External_Verdaux
);
6553 /* Make space for the default version. */
6554 if (info
->create_default_symver
)
6556 size
+= sizeof (Elf_External_Verdef
);
6560 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6562 struct bfd_elf_version_deps
*n
;
6564 /* Don't emit base version twice. */
6568 size
+= sizeof (Elf_External_Verdef
);
6569 size
+= sizeof (Elf_External_Verdaux
);
6572 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6573 size
+= sizeof (Elf_External_Verdaux
);
6577 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6578 if (s
->contents
== NULL
&& s
->size
!= 0)
6581 /* Fill in the version definition section. */
6585 def
.vd_version
= VER_DEF_CURRENT
;
6586 def
.vd_flags
= VER_FLG_BASE
;
6589 if (info
->create_default_symver
)
6591 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6592 def
.vd_next
= sizeof (Elf_External_Verdef
);
6596 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6597 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6598 + sizeof (Elf_External_Verdaux
));
6601 if (soname_indx
!= (size_t) -1)
6603 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6605 def
.vd_hash
= bfd_elf_hash (soname
);
6606 defaux
.vda_name
= soname_indx
;
6613 name
= lbasename (bfd_get_filename (output_bfd
));
6614 def
.vd_hash
= bfd_elf_hash (name
);
6615 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6617 if (indx
== (size_t) -1)
6619 defaux
.vda_name
= indx
;
6621 defaux
.vda_next
= 0;
6623 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6624 (Elf_External_Verdef
*) p
);
6625 p
+= sizeof (Elf_External_Verdef
);
6626 if (info
->create_default_symver
)
6628 /* Add a symbol representing this version. */
6630 if (! (_bfd_generic_link_add_one_symbol
6631 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6633 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6635 h
= (struct elf_link_hash_entry
*) bh
;
6638 h
->type
= STT_OBJECT
;
6639 h
->verinfo
.vertree
= NULL
;
6641 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6644 /* Create a duplicate of the base version with the same
6645 aux block, but different flags. */
6648 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6650 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6651 + sizeof (Elf_External_Verdaux
));
6654 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6655 (Elf_External_Verdef
*) p
);
6656 p
+= sizeof (Elf_External_Verdef
);
6658 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6659 (Elf_External_Verdaux
*) p
);
6660 p
+= sizeof (Elf_External_Verdaux
);
6662 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6665 struct bfd_elf_version_deps
*n
;
6667 /* Don't emit the base version twice. */
6672 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6675 /* Add a symbol representing this version. */
6677 if (! (_bfd_generic_link_add_one_symbol
6678 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6680 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6682 h
= (struct elf_link_hash_entry
*) bh
;
6685 h
->type
= STT_OBJECT
;
6686 h
->verinfo
.vertree
= t
;
6688 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6691 def
.vd_version
= VER_DEF_CURRENT
;
6693 if (t
->globals
.list
== NULL
6694 && t
->locals
.list
== NULL
6696 def
.vd_flags
|= VER_FLG_WEAK
;
6697 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6698 def
.vd_cnt
= cdeps
+ 1;
6699 def
.vd_hash
= bfd_elf_hash (t
->name
);
6700 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6703 /* If a basever node is next, it *must* be the last node in
6704 the chain, otherwise Verdef construction breaks. */
6705 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6706 BFD_ASSERT (t
->next
->next
== NULL
);
6708 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6709 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6710 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6712 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6713 (Elf_External_Verdef
*) p
);
6714 p
+= sizeof (Elf_External_Verdef
);
6716 defaux
.vda_name
= h
->dynstr_index
;
6717 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6719 defaux
.vda_next
= 0;
6720 if (t
->deps
!= NULL
)
6721 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6722 t
->name_indx
= defaux
.vda_name
;
6724 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6725 (Elf_External_Verdaux
*) p
);
6726 p
+= sizeof (Elf_External_Verdaux
);
6728 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6730 if (n
->version_needed
== NULL
)
6732 /* This can happen if there was an error in the
6734 defaux
.vda_name
= 0;
6738 defaux
.vda_name
= n
->version_needed
->name_indx
;
6739 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6742 if (n
->next
== NULL
)
6743 defaux
.vda_next
= 0;
6745 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6747 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6748 (Elf_External_Verdaux
*) p
);
6749 p
+= sizeof (Elf_External_Verdaux
);
6753 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6757 bed
= get_elf_backend_data (output_bfd
);
6759 if (info
->gc_sections
&& bed
->can_gc_sections
)
6761 struct elf_gc_sweep_symbol_info sweep_info
;
6763 /* Remove the symbols that were in the swept sections from the
6764 dynamic symbol table. */
6765 sweep_info
.info
= info
;
6766 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6767 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6771 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6774 struct elf_find_verdep_info sinfo
;
6776 /* Work out the size of the version reference section. */
6778 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6779 BFD_ASSERT (s
!= NULL
);
6782 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6783 if (sinfo
.vers
== 0)
6785 sinfo
.failed
= FALSE
;
6787 elf_link_hash_traverse (elf_hash_table (info
),
6788 _bfd_elf_link_find_version_dependencies
,
6793 if (elf_tdata (output_bfd
)->verref
== NULL
)
6794 s
->flags
|= SEC_EXCLUDE
;
6797 Elf_Internal_Verneed
*vn
;
6802 /* Build the version dependency section. */
6805 for (vn
= elf_tdata (output_bfd
)->verref
;
6807 vn
= vn
->vn_nextref
)
6809 Elf_Internal_Vernaux
*a
;
6811 size
+= sizeof (Elf_External_Verneed
);
6813 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6814 size
+= sizeof (Elf_External_Vernaux
);
6818 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6819 if (s
->contents
== NULL
)
6823 for (vn
= elf_tdata (output_bfd
)->verref
;
6825 vn
= vn
->vn_nextref
)
6828 Elf_Internal_Vernaux
*a
;
6832 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6835 vn
->vn_version
= VER_NEED_CURRENT
;
6837 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6838 elf_dt_name (vn
->vn_bfd
) != NULL
6839 ? elf_dt_name (vn
->vn_bfd
)
6840 : lbasename (bfd_get_filename
6843 if (indx
== (size_t) -1)
6846 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6847 if (vn
->vn_nextref
== NULL
)
6850 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6851 + caux
* sizeof (Elf_External_Vernaux
));
6853 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6854 (Elf_External_Verneed
*) p
);
6855 p
+= sizeof (Elf_External_Verneed
);
6857 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6859 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6860 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6861 a
->vna_nodename
, FALSE
);
6862 if (indx
== (size_t) -1)
6865 if (a
->vna_nextptr
== NULL
)
6868 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6870 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6871 (Elf_External_Vernaux
*) p
);
6872 p
+= sizeof (Elf_External_Vernaux
);
6876 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6880 /* Any syms created from now on start with -1 in
6881 got.refcount/offset and plt.refcount/offset. */
6882 elf_hash_table (info
)->init_got_refcount
6883 = elf_hash_table (info
)->init_got_offset
;
6884 elf_hash_table (info
)->init_plt_refcount
6885 = elf_hash_table (info
)->init_plt_offset
;
6887 if (bfd_link_relocatable (info
)
6888 && !_bfd_elf_size_group_sections (info
))
6891 /* The backend may have to create some sections regardless of whether
6892 we're dynamic or not. */
6893 if (bed
->elf_backend_always_size_sections
6894 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6897 /* Determine any GNU_STACK segment requirements, after the backend
6898 has had a chance to set a default segment size. */
6899 if (info
->execstack
)
6900 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6901 else if (info
->noexecstack
)
6902 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6906 asection
*notesec
= NULL
;
6909 for (inputobj
= info
->input_bfds
;
6911 inputobj
= inputobj
->link
.next
)
6916 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6918 s
= inputobj
->sections
;
6919 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6922 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6925 if (s
->flags
& SEC_CODE
)
6929 else if (bed
->default_execstack
)
6932 if (notesec
|| info
->stacksize
> 0)
6933 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
6934 if (notesec
&& exec
&& bfd_link_relocatable (info
)
6935 && notesec
->output_section
!= bfd_abs_section_ptr
)
6936 notesec
->output_section
->flags
|= SEC_CODE
;
6939 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6941 struct elf_info_failed eif
;
6942 struct elf_link_hash_entry
*h
;
6946 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
6947 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
6951 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
6953 info
->flags
|= DF_SYMBOLIC
;
6961 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
6963 if (indx
== (size_t) -1)
6966 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
6967 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
6971 if (filter_shlib
!= NULL
)
6975 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6976 filter_shlib
, TRUE
);
6977 if (indx
== (size_t) -1
6978 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
6982 if (auxiliary_filters
!= NULL
)
6984 const char * const *p
;
6986 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
6990 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6992 if (indx
== (size_t) -1
6993 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7002 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7004 if (indx
== (size_t) -1
7005 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7009 if (depaudit
!= NULL
)
7013 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7015 if (indx
== (size_t) -1
7016 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7023 /* Find all symbols which were defined in a dynamic object and make
7024 the backend pick a reasonable value for them. */
7025 elf_link_hash_traverse (elf_hash_table (info
),
7026 _bfd_elf_adjust_dynamic_symbol
,
7031 /* Add some entries to the .dynamic section. We fill in some of the
7032 values later, in bfd_elf_final_link, but we must add the entries
7033 now so that we know the final size of the .dynamic section. */
7035 /* If there are initialization and/or finalization functions to
7036 call then add the corresponding DT_INIT/DT_FINI entries. */
7037 h
= (info
->init_function
7038 ? elf_link_hash_lookup (elf_hash_table (info
),
7039 info
->init_function
, FALSE
,
7046 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7049 h
= (info
->fini_function
7050 ? elf_link_hash_lookup (elf_hash_table (info
),
7051 info
->fini_function
, FALSE
,
7058 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7062 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7063 if (s
!= NULL
&& s
->linker_has_input
)
7065 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7066 if (! bfd_link_executable (info
))
7071 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7072 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7073 && (o
= sub
->sections
) != NULL
7074 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7075 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7076 if (elf_section_data (o
)->this_hdr
.sh_type
7077 == SHT_PREINIT_ARRAY
)
7080 (_("%pB: .preinit_array section is not allowed in DSO"),
7085 bfd_set_error (bfd_error_nonrepresentable_section
);
7089 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7090 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7093 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7094 if (s
!= NULL
&& s
->linker_has_input
)
7096 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7097 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7100 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7101 if (s
!= NULL
&& s
->linker_has_input
)
7103 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7104 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7108 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7109 /* If .dynstr is excluded from the link, we don't want any of
7110 these tags. Strictly, we should be checking each section
7111 individually; This quick check covers for the case where
7112 someone does a /DISCARD/ : { *(*) }. */
7113 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7115 bfd_size_type strsize
;
7117 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7118 if ((info
->emit_hash
7119 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7120 || (info
->emit_gnu_hash
7121 && (bed
->record_xhash_symbol
== NULL
7122 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7123 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7124 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7125 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7126 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7127 bed
->s
->sizeof_sym
))
7132 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7135 /* The backend must work out the sizes of all the other dynamic
7138 && bed
->elf_backend_size_dynamic_sections
!= NULL
7139 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7142 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7144 if (elf_tdata (output_bfd
)->cverdefs
)
7146 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7148 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7149 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7153 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7155 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7158 else if (info
->flags
& DF_BIND_NOW
)
7160 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7166 if (bfd_link_executable (info
))
7167 info
->flags_1
&= ~ (DF_1_INITFIRST
7170 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7174 if (elf_tdata (output_bfd
)->cverrefs
)
7176 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7178 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7179 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7183 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7184 && elf_tdata (output_bfd
)->cverdefs
== 0)
7185 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7189 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7190 s
->flags
|= SEC_EXCLUDE
;
7196 /* Find the first non-excluded output section. We'll use its
7197 section symbol for some emitted relocs. */
7199 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7202 asection
*found
= NULL
;
7204 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7205 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7206 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7209 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7212 elf_hash_table (info
)->text_index_section
= found
;
7215 /* Find two non-excluded output sections, one for code, one for data.
7216 We'll use their section symbols for some emitted relocs. */
7218 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7221 asection
*found
= NULL
;
7223 /* Data first, since setting text_index_section changes
7224 _bfd_elf_omit_section_dynsym_default. */
7225 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7226 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7227 && !(s
->flags
& SEC_READONLY
)
7228 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7231 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7234 elf_hash_table (info
)->data_index_section
= found
;
7236 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7237 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7238 && (s
->flags
& SEC_READONLY
)
7239 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7244 elf_hash_table (info
)->text_index_section
= found
;
7247 #define GNU_HASH_SECTION_NAME(bed) \
7248 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7251 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7253 const struct elf_backend_data
*bed
;
7254 unsigned long section_sym_count
;
7255 bfd_size_type dynsymcount
= 0;
7257 if (!is_elf_hash_table (info
->hash
))
7260 bed
= get_elf_backend_data (output_bfd
);
7261 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7263 /* Assign dynsym indices. In a shared library we generate a section
7264 symbol for each output section, which come first. Next come all
7265 of the back-end allocated local dynamic syms, followed by the rest
7266 of the global symbols.
7268 This is usually not needed for static binaries, however backends
7269 can request to always do it, e.g. the MIPS backend uses dynamic
7270 symbol counts to lay out GOT, which will be produced in the
7271 presence of GOT relocations even in static binaries (holding fixed
7272 data in that case, to satisfy those relocations). */
7274 if (elf_hash_table (info
)->dynamic_sections_created
7275 || bed
->always_renumber_dynsyms
)
7276 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7277 §ion_sym_count
);
7279 if (elf_hash_table (info
)->dynamic_sections_created
)
7283 unsigned int dtagcount
;
7285 dynobj
= elf_hash_table (info
)->dynobj
;
7287 /* Work out the size of the symbol version section. */
7288 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7289 BFD_ASSERT (s
!= NULL
);
7290 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7292 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7293 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7294 if (s
->contents
== NULL
)
7297 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7301 /* Set the size of the .dynsym and .hash sections. We counted
7302 the number of dynamic symbols in elf_link_add_object_symbols.
7303 We will build the contents of .dynsym and .hash when we build
7304 the final symbol table, because until then we do not know the
7305 correct value to give the symbols. We built the .dynstr
7306 section as we went along in elf_link_add_object_symbols. */
7307 s
= elf_hash_table (info
)->dynsym
;
7308 BFD_ASSERT (s
!= NULL
);
7309 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7311 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7312 if (s
->contents
== NULL
)
7315 /* The first entry in .dynsym is a dummy symbol. Clear all the
7316 section syms, in case we don't output them all. */
7317 ++section_sym_count
;
7318 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7320 elf_hash_table (info
)->bucketcount
= 0;
7322 /* Compute the size of the hashing table. As a side effect this
7323 computes the hash values for all the names we export. */
7324 if (info
->emit_hash
)
7326 unsigned long int *hashcodes
;
7327 struct hash_codes_info hashinf
;
7329 unsigned long int nsyms
;
7331 size_t hash_entry_size
;
7333 /* Compute the hash values for all exported symbols. At the same
7334 time store the values in an array so that we could use them for
7336 amt
= dynsymcount
* sizeof (unsigned long int);
7337 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7338 if (hashcodes
== NULL
)
7340 hashinf
.hashcodes
= hashcodes
;
7341 hashinf
.error
= FALSE
;
7343 /* Put all hash values in HASHCODES. */
7344 elf_link_hash_traverse (elf_hash_table (info
),
7345 elf_collect_hash_codes
, &hashinf
);
7352 nsyms
= hashinf
.hashcodes
- hashcodes
;
7354 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7357 if (bucketcount
== 0 && nsyms
> 0)
7360 elf_hash_table (info
)->bucketcount
= bucketcount
;
7362 s
= bfd_get_linker_section (dynobj
, ".hash");
7363 BFD_ASSERT (s
!= NULL
);
7364 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7365 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7366 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7367 if (s
->contents
== NULL
)
7370 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7371 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7372 s
->contents
+ hash_entry_size
);
7375 if (info
->emit_gnu_hash
)
7378 unsigned char *contents
;
7379 struct collect_gnu_hash_codes cinfo
;
7383 memset (&cinfo
, 0, sizeof (cinfo
));
7385 /* Compute the hash values for all exported symbols. At the same
7386 time store the values in an array so that we could use them for
7388 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7389 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7390 if (cinfo
.hashcodes
== NULL
)
7393 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7394 cinfo
.min_dynindx
= -1;
7395 cinfo
.output_bfd
= output_bfd
;
7398 /* Put all hash values in HASHCODES. */
7399 elf_link_hash_traverse (elf_hash_table (info
),
7400 elf_collect_gnu_hash_codes
, &cinfo
);
7403 free (cinfo
.hashcodes
);
7408 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7410 if (bucketcount
== 0)
7412 free (cinfo
.hashcodes
);
7416 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7417 BFD_ASSERT (s
!= NULL
);
7419 if (cinfo
.nsyms
== 0)
7421 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7422 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7423 free (cinfo
.hashcodes
);
7424 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7425 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7426 if (contents
== NULL
)
7428 s
->contents
= contents
;
7429 /* 1 empty bucket. */
7430 bfd_put_32 (output_bfd
, 1, contents
);
7431 /* SYMIDX above the special symbol 0. */
7432 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7433 /* Just one word for bitmask. */
7434 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7435 /* Only hash fn bloom filter. */
7436 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7437 /* No hashes are valid - empty bitmask. */
7438 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7439 /* No hashes in the only bucket. */
7440 bfd_put_32 (output_bfd
, 0,
7441 contents
+ 16 + bed
->s
->arch_size
/ 8);
7445 unsigned long int maskwords
, maskbitslog2
, x
;
7446 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7450 while ((x
>>= 1) != 0)
7452 if (maskbitslog2
< 3)
7454 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7455 maskbitslog2
= maskbitslog2
+ 3;
7457 maskbitslog2
= maskbitslog2
+ 2;
7458 if (bed
->s
->arch_size
== 64)
7460 if (maskbitslog2
== 5)
7466 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7467 cinfo
.shift2
= maskbitslog2
;
7468 cinfo
.maskbits
= 1 << maskbitslog2
;
7469 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7470 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7471 amt
+= maskwords
* sizeof (bfd_vma
);
7472 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7473 if (cinfo
.bitmask
== NULL
)
7475 free (cinfo
.hashcodes
);
7479 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7480 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7481 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7482 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7484 /* Determine how often each hash bucket is used. */
7485 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7486 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7487 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7489 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7490 if (cinfo
.counts
[i
] != 0)
7492 cinfo
.indx
[i
] = cnt
;
7493 cnt
+= cinfo
.counts
[i
];
7495 BFD_ASSERT (cnt
== dynsymcount
);
7496 cinfo
.bucketcount
= bucketcount
;
7497 cinfo
.local_indx
= cinfo
.min_dynindx
;
7499 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7500 s
->size
+= cinfo
.maskbits
/ 8;
7501 if (bed
->record_xhash_symbol
!= NULL
)
7502 s
->size
+= cinfo
.nsyms
* 4;
7503 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7504 if (contents
== NULL
)
7506 free (cinfo
.bitmask
);
7507 free (cinfo
.hashcodes
);
7511 s
->contents
= contents
;
7512 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7513 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7514 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7515 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7516 contents
+= 16 + cinfo
.maskbits
/ 8;
7518 for (i
= 0; i
< bucketcount
; ++i
)
7520 if (cinfo
.counts
[i
] == 0)
7521 bfd_put_32 (output_bfd
, 0, contents
);
7523 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7527 cinfo
.contents
= contents
;
7529 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7530 /* Renumber dynamic symbols, if populating .gnu.hash section.
7531 If using .MIPS.xhash, populate the translation table. */
7532 elf_link_hash_traverse (elf_hash_table (info
),
7533 elf_gnu_hash_process_symidx
, &cinfo
);
7535 contents
= s
->contents
+ 16;
7536 for (i
= 0; i
< maskwords
; ++i
)
7538 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7540 contents
+= bed
->s
->arch_size
/ 8;
7543 free (cinfo
.bitmask
);
7544 free (cinfo
.hashcodes
);
7548 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7549 BFD_ASSERT (s
!= NULL
);
7551 elf_finalize_dynstr (output_bfd
, info
);
7553 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7555 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7556 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7563 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7566 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7569 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7570 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7573 /* Finish SHF_MERGE section merging. */
7576 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7581 if (!is_elf_hash_table (info
->hash
))
7584 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7585 if ((ibfd
->flags
& DYNAMIC
) == 0
7586 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7587 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7588 == get_elf_backend_data (obfd
)->s
->elfclass
))
7589 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7590 if ((sec
->flags
& SEC_MERGE
) != 0
7591 && !bfd_is_abs_section (sec
->output_section
))
7593 struct bfd_elf_section_data
*secdata
;
7595 secdata
= elf_section_data (sec
);
7596 if (! _bfd_add_merge_section (obfd
,
7597 &elf_hash_table (info
)->merge_info
,
7598 sec
, &secdata
->sec_info
))
7600 else if (secdata
->sec_info
)
7601 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7604 if (elf_hash_table (info
)->merge_info
!= NULL
)
7605 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7606 merge_sections_remove_hook
);
7610 /* Create an entry in an ELF linker hash table. */
7612 struct bfd_hash_entry
*
7613 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7614 struct bfd_hash_table
*table
,
7617 /* Allocate the structure if it has not already been allocated by a
7621 entry
= (struct bfd_hash_entry
*)
7622 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7627 /* Call the allocation method of the superclass. */
7628 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7631 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7632 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7634 /* Set local fields. */
7637 ret
->got
= htab
->init_got_refcount
;
7638 ret
->plt
= htab
->init_plt_refcount
;
7639 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7640 - offsetof (struct elf_link_hash_entry
, size
)));
7641 /* Assume that we have been called by a non-ELF symbol reader.
7642 This flag is then reset by the code which reads an ELF input
7643 file. This ensures that a symbol created by a non-ELF symbol
7644 reader will have the flag set correctly. */
7651 /* Copy data from an indirect symbol to its direct symbol, hiding the
7652 old indirect symbol. Also used for copying flags to a weakdef. */
7655 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7656 struct elf_link_hash_entry
*dir
,
7657 struct elf_link_hash_entry
*ind
)
7659 struct elf_link_hash_table
*htab
;
7661 if (ind
->dyn_relocs
!= NULL
)
7663 if (dir
->dyn_relocs
!= NULL
)
7665 struct elf_dyn_relocs
**pp
;
7666 struct elf_dyn_relocs
*p
;
7668 /* Add reloc counts against the indirect sym to the direct sym
7669 list. Merge any entries against the same section. */
7670 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7672 struct elf_dyn_relocs
*q
;
7674 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7675 if (q
->sec
== p
->sec
)
7677 q
->pc_count
+= p
->pc_count
;
7678 q
->count
+= p
->count
;
7685 *pp
= dir
->dyn_relocs
;
7688 dir
->dyn_relocs
= ind
->dyn_relocs
;
7689 ind
->dyn_relocs
= NULL
;
7692 /* Copy down any references that we may have already seen to the
7693 symbol which just became indirect. */
7695 if (dir
->versioned
!= versioned_hidden
)
7696 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7697 dir
->ref_regular
|= ind
->ref_regular
;
7698 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7699 dir
->non_got_ref
|= ind
->non_got_ref
;
7700 dir
->needs_plt
|= ind
->needs_plt
;
7701 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7703 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7706 /* Copy over the global and procedure linkage table refcount entries.
7707 These may have been already set up by a check_relocs routine. */
7708 htab
= elf_hash_table (info
);
7709 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7711 if (dir
->got
.refcount
< 0)
7712 dir
->got
.refcount
= 0;
7713 dir
->got
.refcount
+= ind
->got
.refcount
;
7714 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7717 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7719 if (dir
->plt
.refcount
< 0)
7720 dir
->plt
.refcount
= 0;
7721 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7722 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7725 if (ind
->dynindx
!= -1)
7727 if (dir
->dynindx
!= -1)
7728 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7729 dir
->dynindx
= ind
->dynindx
;
7730 dir
->dynstr_index
= ind
->dynstr_index
;
7732 ind
->dynstr_index
= 0;
7737 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7738 struct elf_link_hash_entry
*h
,
7739 bfd_boolean force_local
)
7741 /* STT_GNU_IFUNC symbol must go through PLT. */
7742 if (h
->type
!= STT_GNU_IFUNC
)
7744 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7749 h
->forced_local
= 1;
7750 if (h
->dynindx
!= -1)
7752 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7755 h
->dynstr_index
= 0;
7760 /* Hide a symbol. */
7763 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7764 struct bfd_link_info
*info
,
7765 struct bfd_link_hash_entry
*h
)
7767 if (is_elf_hash_table (info
->hash
))
7769 const struct elf_backend_data
*bed
7770 = get_elf_backend_data (output_bfd
);
7771 struct elf_link_hash_entry
*eh
7772 = (struct elf_link_hash_entry
*) h
;
7773 bed
->elf_backend_hide_symbol (info
, eh
, TRUE
);
7774 eh
->def_dynamic
= 0;
7775 eh
->ref_dynamic
= 0;
7776 eh
->dynamic_def
= 0;
7780 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7784 _bfd_elf_link_hash_table_init
7785 (struct elf_link_hash_table
*table
,
7787 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7788 struct bfd_hash_table
*,
7790 unsigned int entsize
,
7791 enum elf_target_id target_id
)
7794 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7796 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7797 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7798 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7799 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7800 /* The first dynamic symbol is a dummy. */
7801 table
->dynsymcount
= 1;
7803 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7805 table
->root
.type
= bfd_link_elf_hash_table
;
7806 table
->hash_table_id
= target_id
;
7807 table
->target_os
= get_elf_backend_data (abfd
)->target_os
;
7812 /* Create an ELF linker hash table. */
7814 struct bfd_link_hash_table
*
7815 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7817 struct elf_link_hash_table
*ret
;
7818 size_t amt
= sizeof (struct elf_link_hash_table
);
7820 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7824 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7825 sizeof (struct elf_link_hash_entry
),
7831 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7836 /* Destroy an ELF linker hash table. */
7839 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7841 struct elf_link_hash_table
*htab
;
7843 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7844 if (htab
->dynstr
!= NULL
)
7845 _bfd_elf_strtab_free (htab
->dynstr
);
7846 _bfd_merge_sections_free (htab
->merge_info
);
7847 _bfd_generic_link_hash_table_free (obfd
);
7850 /* This is a hook for the ELF emulation code in the generic linker to
7851 tell the backend linker what file name to use for the DT_NEEDED
7852 entry for a dynamic object. */
7855 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7857 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7858 && bfd_get_format (abfd
) == bfd_object
)
7859 elf_dt_name (abfd
) = name
;
7863 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7866 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7867 && bfd_get_format (abfd
) == bfd_object
)
7868 lib_class
= elf_dyn_lib_class (abfd
);
7875 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7877 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7878 && bfd_get_format (abfd
) == bfd_object
)
7879 elf_dyn_lib_class (abfd
) = lib_class
;
7882 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7883 the linker ELF emulation code. */
7885 struct bfd_link_needed_list
*
7886 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7887 struct bfd_link_info
*info
)
7889 if (! is_elf_hash_table (info
->hash
))
7891 return elf_hash_table (info
)->needed
;
7894 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7895 hook for the linker ELF emulation code. */
7897 struct bfd_link_needed_list
*
7898 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7899 struct bfd_link_info
*info
)
7901 if (! is_elf_hash_table (info
->hash
))
7903 return elf_hash_table (info
)->runpath
;
7906 /* Get the name actually used for a dynamic object for a link. This
7907 is the SONAME entry if there is one. Otherwise, it is the string
7908 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7911 bfd_elf_get_dt_soname (bfd
*abfd
)
7913 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7914 && bfd_get_format (abfd
) == bfd_object
)
7915 return elf_dt_name (abfd
);
7919 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7920 the ELF linker emulation code. */
7923 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7924 struct bfd_link_needed_list
**pneeded
)
7927 bfd_byte
*dynbuf
= NULL
;
7928 unsigned int elfsec
;
7929 unsigned long shlink
;
7930 bfd_byte
*extdyn
, *extdynend
;
7932 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
7936 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
7937 || bfd_get_format (abfd
) != bfd_object
)
7940 s
= bfd_get_section_by_name (abfd
, ".dynamic");
7941 if (s
== NULL
|| s
->size
== 0)
7944 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
7947 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
7948 if (elfsec
== SHN_BAD
)
7951 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
7953 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
7954 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
7957 extdynend
= extdyn
+ s
->size
;
7958 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
7960 Elf_Internal_Dyn dyn
;
7962 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
7964 if (dyn
.d_tag
== DT_NULL
)
7967 if (dyn
.d_tag
== DT_NEEDED
)
7970 struct bfd_link_needed_list
*l
;
7971 unsigned int tagv
= dyn
.d_un
.d_val
;
7974 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
7979 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7999 struct elf_symbuf_symbol
8001 unsigned long st_name
; /* Symbol name, index in string tbl */
8002 unsigned char st_info
; /* Type and binding attributes */
8003 unsigned char st_other
; /* Visibilty, and target specific */
8006 struct elf_symbuf_head
8008 struct elf_symbuf_symbol
*ssym
;
8010 unsigned int st_shndx
;
8017 Elf_Internal_Sym
*isym
;
8018 struct elf_symbuf_symbol
*ssym
;
8024 /* Sort references to symbols by ascending section number. */
8027 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8029 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8030 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8032 if (s1
->st_shndx
!= s2
->st_shndx
)
8033 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8034 /* Final sort by the address of the sym in the symbuf ensures
8037 return s1
> s2
? 1 : -1;
8042 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8044 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8045 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8046 int ret
= strcmp (s1
->name
, s2
->name
);
8049 if (s1
->u
.p
!= s2
->u
.p
)
8050 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8054 static struct elf_symbuf_head
*
8055 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8057 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8058 struct elf_symbuf_symbol
*ssym
;
8059 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8060 size_t i
, shndx_count
, total_size
, amt
;
8062 amt
= symcount
* sizeof (*indbuf
);
8063 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8067 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8068 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
8069 *ind
++ = &isymbuf
[i
];
8072 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8073 elf_sort_elf_symbol
);
8076 if (indbufend
> indbuf
)
8077 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8078 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8081 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8082 + (indbufend
- indbuf
) * sizeof (*ssym
));
8083 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8084 if (ssymbuf
== NULL
)
8090 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8091 ssymbuf
->ssym
= NULL
;
8092 ssymbuf
->count
= shndx_count
;
8093 ssymbuf
->st_shndx
= 0;
8094 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8096 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8099 ssymhead
->ssym
= ssym
;
8100 ssymhead
->count
= 0;
8101 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8103 ssym
->st_name
= (*ind
)->st_name
;
8104 ssym
->st_info
= (*ind
)->st_info
;
8105 ssym
->st_other
= (*ind
)->st_other
;
8108 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8109 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
8116 /* Check if 2 sections define the same set of local and global
8120 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8121 struct bfd_link_info
*info
)
8124 const struct elf_backend_data
*bed1
, *bed2
;
8125 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8126 size_t symcount1
, symcount2
;
8127 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8128 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8129 Elf_Internal_Sym
*isym
, *isymend
;
8130 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8131 size_t count1
, count2
, i
;
8132 unsigned int shndx1
, shndx2
;
8138 /* Both sections have to be in ELF. */
8139 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8140 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8143 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8146 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8147 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8148 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8151 bed1
= get_elf_backend_data (bfd1
);
8152 bed2
= get_elf_backend_data (bfd2
);
8153 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8154 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8155 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8156 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8158 if (symcount1
== 0 || symcount2
== 0)
8164 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8165 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8167 if (ssymbuf1
== NULL
)
8169 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8171 if (isymbuf1
== NULL
)
8174 if (!info
->reduce_memory_overheads
)
8176 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8177 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8181 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8183 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8185 if (isymbuf2
== NULL
)
8188 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
8190 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8191 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8195 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8197 /* Optimized faster version. */
8199 struct elf_symbol
*symp
;
8200 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8203 hi
= ssymbuf1
->count
;
8208 mid
= (lo
+ hi
) / 2;
8209 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8211 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8215 count1
= ssymbuf1
[mid
].count
;
8222 hi
= ssymbuf2
->count
;
8227 mid
= (lo
+ hi
) / 2;
8228 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8230 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8234 count2
= ssymbuf2
[mid
].count
;
8240 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8244 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8246 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8247 if (symtable1
== NULL
|| symtable2
== NULL
)
8251 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
8252 ssym
< ssymend
; ssym
++, symp
++)
8254 symp
->u
.ssym
= ssym
;
8255 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8261 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
8262 ssym
< ssymend
; ssym
++, symp
++)
8264 symp
->u
.ssym
= ssym
;
8265 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8270 /* Sort symbol by name. */
8271 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8272 elf_sym_name_compare
);
8273 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8274 elf_sym_name_compare
);
8276 for (i
= 0; i
< count1
; i
++)
8277 /* Two symbols must have the same binding, type and name. */
8278 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8279 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8280 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8287 symtable1
= (struct elf_symbol
*)
8288 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8289 symtable2
= (struct elf_symbol
*)
8290 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8291 if (symtable1
== NULL
|| symtable2
== NULL
)
8294 /* Count definitions in the section. */
8296 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8297 if (isym
->st_shndx
== shndx1
)
8298 symtable1
[count1
++].u
.isym
= isym
;
8301 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8302 if (isym
->st_shndx
== shndx2
)
8303 symtable2
[count2
++].u
.isym
= isym
;
8305 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8308 for (i
= 0; i
< count1
; i
++)
8310 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8311 symtable1
[i
].u
.isym
->st_name
);
8313 for (i
= 0; i
< count2
; i
++)
8315 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8316 symtable2
[i
].u
.isym
->st_name
);
8318 /* Sort symbol by name. */
8319 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8320 elf_sym_name_compare
);
8321 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8322 elf_sym_name_compare
);
8324 for (i
= 0; i
< count1
; i
++)
8325 /* Two symbols must have the same binding, type and name. */
8326 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8327 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8328 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8342 /* Return TRUE if 2 section types are compatible. */
8345 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8346 bfd
*bbfd
, const asection
*bsec
)
8350 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8351 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8354 return elf_section_type (asec
) == elf_section_type (bsec
);
8357 /* Final phase of ELF linker. */
8359 /* A structure we use to avoid passing large numbers of arguments. */
8361 struct elf_final_link_info
8363 /* General link information. */
8364 struct bfd_link_info
*info
;
8367 /* Symbol string table. */
8368 struct elf_strtab_hash
*symstrtab
;
8369 /* .hash section. */
8371 /* symbol version section (.gnu.version). */
8372 asection
*symver_sec
;
8373 /* Buffer large enough to hold contents of any section. */
8375 /* Buffer large enough to hold external relocs of any section. */
8376 void *external_relocs
;
8377 /* Buffer large enough to hold internal relocs of any section. */
8378 Elf_Internal_Rela
*internal_relocs
;
8379 /* Buffer large enough to hold external local symbols of any input
8381 bfd_byte
*external_syms
;
8382 /* And a buffer for symbol section indices. */
8383 Elf_External_Sym_Shndx
*locsym_shndx
;
8384 /* Buffer large enough to hold internal local symbols of any input
8386 Elf_Internal_Sym
*internal_syms
;
8387 /* Array large enough to hold a symbol index for each local symbol
8388 of any input BFD. */
8390 /* Array large enough to hold a section pointer for each local
8391 symbol of any input BFD. */
8392 asection
**sections
;
8393 /* Buffer for SHT_SYMTAB_SHNDX section. */
8394 Elf_External_Sym_Shndx
*symshndxbuf
;
8395 /* Number of STT_FILE syms seen. */
8396 size_t filesym_count
;
8399 /* This struct is used to pass information to elf_link_output_extsym. */
8401 struct elf_outext_info
8404 bfd_boolean localsyms
;
8405 bfd_boolean file_sym_done
;
8406 struct elf_final_link_info
*flinfo
;
8410 /* Support for evaluating a complex relocation.
8412 Complex relocations are generalized, self-describing relocations. The
8413 implementation of them consists of two parts: complex symbols, and the
8414 relocations themselves.
8416 The relocations are use a reserved elf-wide relocation type code (R_RELC
8417 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8418 information (start bit, end bit, word width, etc) into the addend. This
8419 information is extracted from CGEN-generated operand tables within gas.
8421 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
8422 internal) representing prefix-notation expressions, including but not
8423 limited to those sorts of expressions normally encoded as addends in the
8424 addend field. The symbol mangling format is:
8427 | <unary-operator> ':' <node>
8428 | <binary-operator> ':' <node> ':' <node>
8431 <literal> := 's' <digits=N> ':' <N character symbol name>
8432 | 'S' <digits=N> ':' <N character section name>
8436 <binary-operator> := as in C
8437 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8440 set_symbol_value (bfd
*bfd_with_globals
,
8441 Elf_Internal_Sym
*isymbuf
,
8446 struct elf_link_hash_entry
**sym_hashes
;
8447 struct elf_link_hash_entry
*h
;
8448 size_t extsymoff
= locsymcount
;
8450 if (symidx
< locsymcount
)
8452 Elf_Internal_Sym
*sym
;
8454 sym
= isymbuf
+ symidx
;
8455 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8457 /* It is a local symbol: move it to the
8458 "absolute" section and give it a value. */
8459 sym
->st_shndx
= SHN_ABS
;
8460 sym
->st_value
= val
;
8463 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8467 /* It is a global symbol: set its link type
8468 to "defined" and give it a value. */
8470 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8471 h
= sym_hashes
[symidx
- extsymoff
];
8472 while (h
->root
.type
== bfd_link_hash_indirect
8473 || h
->root
.type
== bfd_link_hash_warning
)
8474 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8475 h
->root
.type
= bfd_link_hash_defined
;
8476 h
->root
.u
.def
.value
= val
;
8477 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8481 resolve_symbol (const char *name
,
8483 struct elf_final_link_info
*flinfo
,
8485 Elf_Internal_Sym
*isymbuf
,
8488 Elf_Internal_Sym
*sym
;
8489 struct bfd_link_hash_entry
*global_entry
;
8490 const char *candidate
= NULL
;
8491 Elf_Internal_Shdr
*symtab_hdr
;
8494 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8496 for (i
= 0; i
< locsymcount
; ++ i
)
8500 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8503 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8504 symtab_hdr
->sh_link
,
8507 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8508 name
, candidate
, (unsigned long) sym
->st_value
);
8510 if (candidate
&& strcmp (candidate
, name
) == 0)
8512 asection
*sec
= flinfo
->sections
[i
];
8514 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8515 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8517 printf ("Found symbol with value %8.8lx\n",
8518 (unsigned long) *result
);
8524 /* Hmm, haven't found it yet. perhaps it is a global. */
8525 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8526 FALSE
, FALSE
, TRUE
);
8530 if (global_entry
->type
== bfd_link_hash_defined
8531 || global_entry
->type
== bfd_link_hash_defweak
)
8533 *result
= (global_entry
->u
.def
.value
8534 + global_entry
->u
.def
.section
->output_section
->vma
8535 + global_entry
->u
.def
.section
->output_offset
);
8537 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8538 global_entry
->root
.string
, (unsigned long) *result
);
8546 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8547 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8548 names like "foo.end" which is the end address of section "foo". */
8551 resolve_section (const char *name
,
8559 for (curr
= sections
; curr
; curr
= curr
->next
)
8560 if (strcmp (curr
->name
, name
) == 0)
8562 *result
= curr
->vma
;
8566 /* Hmm. still haven't found it. try pseudo-section names. */
8567 /* FIXME: This could be coded more efficiently... */
8568 for (curr
= sections
; curr
; curr
= curr
->next
)
8570 len
= strlen (curr
->name
);
8571 if (len
> strlen (name
))
8574 if (strncmp (curr
->name
, name
, len
) == 0)
8576 if (strncmp (".end", name
+ len
, 4) == 0)
8578 *result
= (curr
->vma
8579 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8583 /* Insert more pseudo-section names here, if you like. */
8591 undefined_reference (const char *reftype
, const char *name
)
8593 /* xgettext:c-format */
8594 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8599 eval_symbol (bfd_vma
*result
,
8602 struct elf_final_link_info
*flinfo
,
8604 Elf_Internal_Sym
*isymbuf
,
8613 const char *sym
= *symp
;
8615 bfd_boolean symbol_is_section
= FALSE
;
8620 if (len
< 1 || len
> sizeof (symbuf
))
8622 bfd_set_error (bfd_error_invalid_operation
);
8635 *result
= strtoul (sym
, (char **) symp
, 16);
8639 symbol_is_section
= TRUE
;
8643 symlen
= strtol (sym
, (char **) symp
, 10);
8644 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8646 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8648 bfd_set_error (bfd_error_invalid_operation
);
8652 memcpy (symbuf
, sym
, symlen
);
8653 symbuf
[symlen
] = '\0';
8654 *symp
= sym
+ symlen
;
8656 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8657 the symbol as a section, or vice-versa. so we're pretty liberal in our
8658 interpretation here; section means "try section first", not "must be a
8659 section", and likewise with symbol. */
8661 if (symbol_is_section
)
8663 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8664 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8665 isymbuf
, locsymcount
))
8667 undefined_reference ("section", symbuf
);
8673 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8674 isymbuf
, locsymcount
)
8675 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8678 undefined_reference ("symbol", symbuf
);
8685 /* All that remains are operators. */
8687 #define UNARY_OP(op) \
8688 if (strncmp (sym, #op, strlen (#op)) == 0) \
8690 sym += strlen (#op); \
8694 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8695 isymbuf, locsymcount, signed_p)) \
8698 *result = op ((bfd_signed_vma) a); \
8704 #define BINARY_OP(op) \
8705 if (strncmp (sym, #op, strlen (#op)) == 0) \
8707 sym += strlen (#op); \
8711 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8712 isymbuf, locsymcount, signed_p)) \
8715 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8716 isymbuf, locsymcount, signed_p)) \
8719 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8749 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8750 bfd_set_error (bfd_error_invalid_operation
);
8756 put_value (bfd_vma size
,
8757 unsigned long chunksz
,
8762 location
+= (size
- chunksz
);
8764 for (; size
; size
-= chunksz
, location
-= chunksz
)
8769 bfd_put_8 (input_bfd
, x
, location
);
8773 bfd_put_16 (input_bfd
, x
, location
);
8777 bfd_put_32 (input_bfd
, x
, location
);
8778 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8784 bfd_put_64 (input_bfd
, x
, location
);
8785 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8798 get_value (bfd_vma size
,
8799 unsigned long chunksz
,
8806 /* Sanity checks. */
8807 BFD_ASSERT (chunksz
<= sizeof (x
)
8810 && (size
% chunksz
) == 0
8811 && input_bfd
!= NULL
8812 && location
!= NULL
);
8814 if (chunksz
== sizeof (x
))
8816 BFD_ASSERT (size
== chunksz
);
8818 /* Make sure that we do not perform an undefined shift operation.
8819 We know that size == chunksz so there will only be one iteration
8820 of the loop below. */
8824 shift
= 8 * chunksz
;
8826 for (; size
; size
-= chunksz
, location
+= chunksz
)
8831 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
8834 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
8837 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
8841 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
8852 decode_complex_addend (unsigned long *start
, /* in bits */
8853 unsigned long *oplen
, /* in bits */
8854 unsigned long *len
, /* in bits */
8855 unsigned long *wordsz
, /* in bytes */
8856 unsigned long *chunksz
, /* in bytes */
8857 unsigned long *lsb0_p
,
8858 unsigned long *signed_p
,
8859 unsigned long *trunc_p
,
8860 unsigned long encoded
)
8862 * start
= encoded
& 0x3F;
8863 * len
= (encoded
>> 6) & 0x3F;
8864 * oplen
= (encoded
>> 12) & 0x3F;
8865 * wordsz
= (encoded
>> 18) & 0xF;
8866 * chunksz
= (encoded
>> 22) & 0xF;
8867 * lsb0_p
= (encoded
>> 27) & 1;
8868 * signed_p
= (encoded
>> 28) & 1;
8869 * trunc_p
= (encoded
>> 29) & 1;
8872 bfd_reloc_status_type
8873 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
8874 asection
*input_section
,
8876 Elf_Internal_Rela
*rel
,
8879 bfd_vma shift
, x
, mask
;
8880 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
8881 bfd_reloc_status_type r
;
8882 bfd_size_type octets
;
8884 /* Perform this reloc, since it is complex.
8885 (this is not to say that it necessarily refers to a complex
8886 symbol; merely that it is a self-describing CGEN based reloc.
8887 i.e. the addend has the complete reloc information (bit start, end,
8888 word size, etc) encoded within it.). */
8890 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
8891 &chunksz
, &lsb0_p
, &signed_p
,
8892 &trunc_p
, rel
->r_addend
);
8894 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
8897 shift
= (start
+ 1) - len
;
8899 shift
= (8 * wordsz
) - (start
+ len
);
8901 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
8902 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
8905 printf ("Doing complex reloc: "
8906 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8907 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8908 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8909 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
8910 oplen
, (unsigned long) x
, (unsigned long) mask
,
8911 (unsigned long) relocation
);
8916 /* Now do an overflow check. */
8917 r
= bfd_check_overflow ((signed_p
8918 ? complain_overflow_signed
8919 : complain_overflow_unsigned
),
8920 len
, 0, (8 * wordsz
),
8924 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
8927 printf (" relocation: %8.8lx\n"
8928 " shifted mask: %8.8lx\n"
8929 " shifted/masked reloc: %8.8lx\n"
8930 " result: %8.8lx\n",
8931 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
8932 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
8934 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
8938 /* Functions to read r_offset from external (target order) reloc
8939 entry. Faster than bfd_getl32 et al, because we let the compiler
8940 know the value is aligned. */
8943 ext32l_r_offset (const void *p
)
8950 const union aligned32
*a
8951 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8953 uint32_t aval
= ( (uint32_t) a
->c
[0]
8954 | (uint32_t) a
->c
[1] << 8
8955 | (uint32_t) a
->c
[2] << 16
8956 | (uint32_t) a
->c
[3] << 24);
8961 ext32b_r_offset (const void *p
)
8968 const union aligned32
*a
8969 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8971 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
8972 | (uint32_t) a
->c
[1] << 16
8973 | (uint32_t) a
->c
[2] << 8
8974 | (uint32_t) a
->c
[3]);
8978 #ifdef BFD_HOST_64_BIT
8980 ext64l_r_offset (const void *p
)
8987 const union aligned64
*a
8988 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8990 uint64_t aval
= ( (uint64_t) a
->c
[0]
8991 | (uint64_t) a
->c
[1] << 8
8992 | (uint64_t) a
->c
[2] << 16
8993 | (uint64_t) a
->c
[3] << 24
8994 | (uint64_t) a
->c
[4] << 32
8995 | (uint64_t) a
->c
[5] << 40
8996 | (uint64_t) a
->c
[6] << 48
8997 | (uint64_t) a
->c
[7] << 56);
9002 ext64b_r_offset (const void *p
)
9009 const union aligned64
*a
9010 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9012 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9013 | (uint64_t) a
->c
[1] << 48
9014 | (uint64_t) a
->c
[2] << 40
9015 | (uint64_t) a
->c
[3] << 32
9016 | (uint64_t) a
->c
[4] << 24
9017 | (uint64_t) a
->c
[5] << 16
9018 | (uint64_t) a
->c
[6] << 8
9019 | (uint64_t) a
->c
[7]);
9024 /* When performing a relocatable link, the input relocations are
9025 preserved. But, if they reference global symbols, the indices
9026 referenced must be updated. Update all the relocations found in
9030 elf_link_adjust_relocs (bfd
*abfd
,
9032 struct bfd_elf_section_reloc_data
*reldata
,
9034 struct bfd_link_info
*info
)
9037 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9039 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9040 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9041 bfd_vma r_type_mask
;
9043 unsigned int count
= reldata
->count
;
9044 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9046 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9048 swap_in
= bed
->s
->swap_reloc_in
;
9049 swap_out
= bed
->s
->swap_reloc_out
;
9051 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9053 swap_in
= bed
->s
->swap_reloca_in
;
9054 swap_out
= bed
->s
->swap_reloca_out
;
9059 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9062 if (bed
->s
->arch_size
== 32)
9069 r_type_mask
= 0xffffffff;
9073 erela
= reldata
->hdr
->contents
;
9074 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9076 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9079 if (*rel_hash
== NULL
)
9082 if ((*rel_hash
)->indx
== -2
9083 && info
->gc_sections
9084 && ! info
->gc_keep_exported
)
9086 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9087 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9089 (*rel_hash
)->root
.root
.string
);
9090 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9092 bfd_set_error (bfd_error_invalid_operation
);
9095 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9097 (*swap_in
) (abfd
, erela
, irela
);
9098 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9099 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9100 | (irela
[j
].r_info
& r_type_mask
));
9101 (*swap_out
) (abfd
, irela
, erela
);
9104 if (bed
->elf_backend_update_relocs
)
9105 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9107 if (sort
&& count
!= 0)
9109 bfd_vma (*ext_r_off
) (const void *);
9112 bfd_byte
*base
, *end
, *p
, *loc
;
9113 bfd_byte
*buf
= NULL
;
9115 if (bed
->s
->arch_size
== 32)
9117 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9118 ext_r_off
= ext32l_r_offset
;
9119 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9120 ext_r_off
= ext32b_r_offset
;
9126 #ifdef BFD_HOST_64_BIT
9127 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9128 ext_r_off
= ext64l_r_offset
;
9129 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9130 ext_r_off
= ext64b_r_offset
;
9136 /* Must use a stable sort here. A modified insertion sort,
9137 since the relocs are mostly sorted already. */
9138 elt_size
= reldata
->hdr
->sh_entsize
;
9139 base
= reldata
->hdr
->contents
;
9140 end
= base
+ count
* elt_size
;
9141 if (elt_size
> sizeof (Elf64_External_Rela
))
9144 /* Ensure the first element is lowest. This acts as a sentinel,
9145 speeding the main loop below. */
9146 r_off
= (*ext_r_off
) (base
);
9147 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9149 bfd_vma r_off2
= (*ext_r_off
) (p
);
9158 /* Don't just swap *base and *loc as that changes the order
9159 of the original base[0] and base[1] if they happen to
9160 have the same r_offset. */
9161 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9162 memcpy (onebuf
, loc
, elt_size
);
9163 memmove (base
+ elt_size
, base
, loc
- base
);
9164 memcpy (base
, onebuf
, elt_size
);
9167 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9169 /* base to p is sorted, *p is next to insert. */
9170 r_off
= (*ext_r_off
) (p
);
9171 /* Search the sorted region for location to insert. */
9173 while (r_off
< (*ext_r_off
) (loc
))
9178 /* Chances are there is a run of relocs to insert here,
9179 from one of more input files. Files are not always
9180 linked in order due to the way elf_link_input_bfd is
9181 called. See pr17666. */
9182 size_t sortlen
= p
- loc
;
9183 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9184 size_t runlen
= elt_size
;
9185 size_t buf_size
= 96 * 1024;
9186 while (p
+ runlen
< end
9187 && (sortlen
<= buf_size
9188 || runlen
+ elt_size
<= buf_size
)
9189 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9193 buf
= bfd_malloc (buf_size
);
9197 if (runlen
< sortlen
)
9199 memcpy (buf
, p
, runlen
);
9200 memmove (loc
+ runlen
, loc
, sortlen
);
9201 memcpy (loc
, buf
, runlen
);
9205 memcpy (buf
, loc
, sortlen
);
9206 memmove (loc
, p
, runlen
);
9207 memcpy (loc
+ runlen
, buf
, sortlen
);
9209 p
+= runlen
- elt_size
;
9212 /* Hashes are no longer valid. */
9213 free (reldata
->hashes
);
9214 reldata
->hashes
= NULL
;
9220 struct elf_link_sort_rela
9226 enum elf_reloc_type_class type
;
9227 /* We use this as an array of size int_rels_per_ext_rel. */
9228 Elf_Internal_Rela rela
[1];
9231 /* qsort stability here and for cmp2 is only an issue if multiple
9232 dynamic relocations are emitted at the same address. But targets
9233 that apply a series of dynamic relocations each operating on the
9234 result of the prior relocation can't use -z combreloc as
9235 implemented anyway. Such schemes tend to be broken by sorting on
9236 symbol index. That leaves dynamic NONE relocs as the only other
9237 case where ld might emit multiple relocs at the same address, and
9238 those are only emitted due to target bugs. */
9241 elf_link_sort_cmp1 (const void *A
, const void *B
)
9243 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9244 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9245 int relativea
, relativeb
;
9247 relativea
= a
->type
== reloc_class_relative
;
9248 relativeb
= b
->type
== reloc_class_relative
;
9250 if (relativea
< relativeb
)
9252 if (relativea
> relativeb
)
9254 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9256 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9258 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9260 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9266 elf_link_sort_cmp2 (const void *A
, const void *B
)
9268 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9269 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9271 if (a
->type
< b
->type
)
9273 if (a
->type
> b
->type
)
9275 if (a
->u
.offset
< b
->u
.offset
)
9277 if (a
->u
.offset
> b
->u
.offset
)
9279 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9281 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9287 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9289 asection
*dynamic_relocs
;
9292 bfd_size_type count
, size
;
9293 size_t i
, ret
, sort_elt
, ext_size
;
9294 bfd_byte
*sort
, *s_non_relative
, *p
;
9295 struct elf_link_sort_rela
*sq
;
9296 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9297 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9298 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9299 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9300 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9301 struct bfd_link_order
*lo
;
9303 bfd_boolean use_rela
;
9305 /* Find a dynamic reloc section. */
9306 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9307 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9308 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9309 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9311 bfd_boolean use_rela_initialised
= FALSE
;
9313 /* This is just here to stop gcc from complaining.
9314 Its initialization checking code is not perfect. */
9317 /* Both sections are present. Examine the sizes
9318 of the indirect sections to help us choose. */
9319 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9320 if (lo
->type
== bfd_indirect_link_order
)
9322 asection
*o
= lo
->u
.indirect
.section
;
9324 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9326 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9327 /* Section size is divisible by both rel and rela sizes.
9328 It is of no help to us. */
9332 /* Section size is only divisible by rela. */
9333 if (use_rela_initialised
&& !use_rela
)
9335 _bfd_error_handler (_("%pB: unable to sort relocs - "
9336 "they are in more than one size"),
9338 bfd_set_error (bfd_error_invalid_operation
);
9344 use_rela_initialised
= TRUE
;
9348 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9350 /* Section size is only divisible by rel. */
9351 if (use_rela_initialised
&& use_rela
)
9353 _bfd_error_handler (_("%pB: unable to sort relocs - "
9354 "they are in more than one size"),
9356 bfd_set_error (bfd_error_invalid_operation
);
9362 use_rela_initialised
= TRUE
;
9367 /* The section size is not divisible by either -
9368 something is wrong. */
9369 _bfd_error_handler (_("%pB: unable to sort relocs - "
9370 "they are of an unknown size"), abfd
);
9371 bfd_set_error (bfd_error_invalid_operation
);
9376 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9377 if (lo
->type
== bfd_indirect_link_order
)
9379 asection
*o
= lo
->u
.indirect
.section
;
9381 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9383 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9384 /* Section size is divisible by both rel and rela sizes.
9385 It is of no help to us. */
9389 /* Section size is only divisible by rela. */
9390 if (use_rela_initialised
&& !use_rela
)
9392 _bfd_error_handler (_("%pB: unable to sort relocs - "
9393 "they are in more than one size"),
9395 bfd_set_error (bfd_error_invalid_operation
);
9401 use_rela_initialised
= TRUE
;
9405 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9407 /* Section size is only divisible by rel. */
9408 if (use_rela_initialised
&& use_rela
)
9410 _bfd_error_handler (_("%pB: unable to sort relocs - "
9411 "they are in more than one size"),
9413 bfd_set_error (bfd_error_invalid_operation
);
9419 use_rela_initialised
= TRUE
;
9424 /* The section size is not divisible by either -
9425 something is wrong. */
9426 _bfd_error_handler (_("%pB: unable to sort relocs - "
9427 "they are of an unknown size"), abfd
);
9428 bfd_set_error (bfd_error_invalid_operation
);
9433 if (! use_rela_initialised
)
9437 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9439 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9446 dynamic_relocs
= rela_dyn
;
9447 ext_size
= bed
->s
->sizeof_rela
;
9448 swap_in
= bed
->s
->swap_reloca_in
;
9449 swap_out
= bed
->s
->swap_reloca_out
;
9453 dynamic_relocs
= rel_dyn
;
9454 ext_size
= bed
->s
->sizeof_rel
;
9455 swap_in
= bed
->s
->swap_reloc_in
;
9456 swap_out
= bed
->s
->swap_reloc_out
;
9460 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9461 if (lo
->type
== bfd_indirect_link_order
)
9462 size
+= lo
->u
.indirect
.section
->size
;
9464 if (size
!= dynamic_relocs
->size
)
9467 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9468 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9470 count
= dynamic_relocs
->size
/ ext_size
;
9473 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9477 (*info
->callbacks
->warning
)
9478 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9482 if (bed
->s
->arch_size
== 32)
9483 r_sym_mask
= ~(bfd_vma
) 0xff;
9485 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9487 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9488 if (lo
->type
== bfd_indirect_link_order
)
9490 bfd_byte
*erel
, *erelend
;
9491 asection
*o
= lo
->u
.indirect
.section
;
9493 if (o
->contents
== NULL
&& o
->size
!= 0)
9495 /* This is a reloc section that is being handled as a normal
9496 section. See bfd_section_from_shdr. We can't combine
9497 relocs in this case. */
9502 erelend
= o
->contents
+ o
->size
;
9503 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9505 while (erel
< erelend
)
9507 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9509 (*swap_in
) (abfd
, erel
, s
->rela
);
9510 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9511 s
->u
.sym_mask
= r_sym_mask
;
9517 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9519 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9521 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9522 if (s
->type
!= reloc_class_relative
)
9528 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9529 for (; i
< count
; i
++, p
+= sort_elt
)
9531 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9532 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9534 sp
->u
.offset
= sq
->rela
->r_offset
;
9537 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9539 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9540 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9542 /* We have plt relocs in .rela.dyn. */
9543 sq
= (struct elf_link_sort_rela
*) sort
;
9544 for (i
= 0; i
< count
; i
++)
9545 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9547 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9549 struct bfd_link_order
**plo
;
9550 /* Put srelplt link_order last. This is so the output_offset
9551 set in the next loop is correct for DT_JMPREL. */
9552 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9553 if ((*plo
)->type
== bfd_indirect_link_order
9554 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9560 plo
= &(*plo
)->next
;
9563 dynamic_relocs
->map_tail
.link_order
= lo
;
9568 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9569 if (lo
->type
== bfd_indirect_link_order
)
9571 bfd_byte
*erel
, *erelend
;
9572 asection
*o
= lo
->u
.indirect
.section
;
9575 erelend
= o
->contents
+ o
->size
;
9576 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9577 while (erel
< erelend
)
9579 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9580 (*swap_out
) (abfd
, s
->rela
, erel
);
9587 *psec
= dynamic_relocs
;
9591 /* Add a symbol to the output symbol string table. */
9594 elf_link_output_symstrtab (struct elf_final_link_info
*flinfo
,
9596 Elf_Internal_Sym
*elfsym
,
9597 asection
*input_sec
,
9598 struct elf_link_hash_entry
*h
)
9600 int (*output_symbol_hook
)
9601 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9602 struct elf_link_hash_entry
*);
9603 struct elf_link_hash_table
*hash_table
;
9604 const struct elf_backend_data
*bed
;
9605 bfd_size_type strtabsize
;
9607 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9609 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9610 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9611 if (output_symbol_hook
!= NULL
)
9613 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9618 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9619 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9620 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9621 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9625 || (input_sec
->flags
& SEC_EXCLUDE
))
9626 elfsym
->st_name
= (unsigned long) -1;
9629 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9630 to get the final offset for st_name. */
9632 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9634 if (elfsym
->st_name
== (unsigned long) -1)
9638 hash_table
= elf_hash_table (flinfo
->info
);
9639 strtabsize
= hash_table
->strtabsize
;
9640 if (strtabsize
<= hash_table
->strtabcount
)
9642 strtabsize
+= strtabsize
;
9643 hash_table
->strtabsize
= strtabsize
;
9644 strtabsize
*= sizeof (*hash_table
->strtab
);
9646 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9648 if (hash_table
->strtab
== NULL
)
9651 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9652 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9653 = hash_table
->strtabcount
;
9654 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9655 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9657 flinfo
->output_bfd
->symcount
+= 1;
9658 hash_table
->strtabcount
+= 1;
9663 /* Swap symbols out to the symbol table and flush the output symbols to
9667 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9669 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9672 const struct elf_backend_data
*bed
;
9674 Elf_Internal_Shdr
*hdr
;
9678 if (!hash_table
->strtabcount
)
9681 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9683 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9685 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9686 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9690 if (flinfo
->symshndxbuf
)
9692 amt
= sizeof (Elf_External_Sym_Shndx
);
9693 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9694 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9695 if (flinfo
->symshndxbuf
== NULL
)
9702 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9704 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9705 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9706 elfsym
->sym
.st_name
= 0;
9709 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9710 elfsym
->sym
.st_name
);
9711 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9712 ((bfd_byte
*) symbuf
9713 + (elfsym
->dest_index
9714 * bed
->s
->sizeof_sym
)),
9715 (flinfo
->symshndxbuf
9716 + elfsym
->destshndx_index
));
9719 /* Allow the linker to examine the strtab and symtab now they are
9722 if (flinfo
->info
->callbacks
->examine_strtab
)
9723 flinfo
->info
->callbacks
->examine_strtab (hash_table
->strtab
,
9724 hash_table
->strtabcount
,
9727 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9728 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9729 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9730 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9731 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9733 hdr
->sh_size
+= amt
;
9741 free (hash_table
->strtab
);
9742 hash_table
->strtab
= NULL
;
9747 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9750 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9752 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9753 && sym
->st_shndx
< SHN_LORESERVE
)
9755 /* The gABI doesn't support dynamic symbols in output sections
9758 /* xgettext:c-format */
9759 (_("%pB: too many sections: %d (>= %d)"),
9760 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9761 bfd_set_error (bfd_error_nonrepresentable_section
);
9767 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9768 allowing an unsatisfied unversioned symbol in the DSO to match a
9769 versioned symbol that would normally require an explicit version.
9770 We also handle the case that a DSO references a hidden symbol
9771 which may be satisfied by a versioned symbol in another DSO. */
9774 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
9775 const struct elf_backend_data
*bed
,
9776 struct elf_link_hash_entry
*h
)
9779 struct elf_link_loaded_list
*loaded
;
9781 if (!is_elf_hash_table (info
->hash
))
9784 /* Check indirect symbol. */
9785 while (h
->root
.type
== bfd_link_hash_indirect
)
9786 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9788 switch (h
->root
.type
)
9794 case bfd_link_hash_undefined
:
9795 case bfd_link_hash_undefweak
:
9796 abfd
= h
->root
.u
.undef
.abfd
;
9798 || (abfd
->flags
& DYNAMIC
) == 0
9799 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
9803 case bfd_link_hash_defined
:
9804 case bfd_link_hash_defweak
:
9805 abfd
= h
->root
.u
.def
.section
->owner
;
9808 case bfd_link_hash_common
:
9809 abfd
= h
->root
.u
.c
.p
->section
->owner
;
9812 BFD_ASSERT (abfd
!= NULL
);
9814 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
9816 loaded
= loaded
->next
)
9819 Elf_Internal_Shdr
*hdr
;
9823 Elf_Internal_Shdr
*versymhdr
;
9824 Elf_Internal_Sym
*isym
;
9825 Elf_Internal_Sym
*isymend
;
9826 Elf_Internal_Sym
*isymbuf
;
9827 Elf_External_Versym
*ever
;
9828 Elf_External_Versym
*extversym
;
9830 input
= loaded
->abfd
;
9832 /* We check each DSO for a possible hidden versioned definition. */
9834 || elf_dynversym (input
) == 0)
9837 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
9839 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9840 if (elf_bad_symtab (input
))
9842 extsymcount
= symcount
;
9847 extsymcount
= symcount
- hdr
->sh_info
;
9848 extsymoff
= hdr
->sh_info
;
9851 if (extsymcount
== 0)
9854 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
9856 if (isymbuf
== NULL
)
9859 /* Read in any version definitions. */
9860 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
9861 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
9862 || (extversym
= (Elf_External_Versym
*)
9863 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
9864 versymhdr
->sh_size
)) == NULL
)
9870 ever
= extversym
+ extsymoff
;
9871 isymend
= isymbuf
+ extsymcount
;
9872 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
9875 Elf_Internal_Versym iver
;
9876 unsigned short version_index
;
9878 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
9879 || isym
->st_shndx
== SHN_UNDEF
)
9882 name
= bfd_elf_string_from_elf_section (input
,
9885 if (strcmp (name
, h
->root
.root
.string
) != 0)
9888 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
9890 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
9892 && h
->forced_local
))
9894 /* If we have a non-hidden versioned sym, then it should
9895 have provided a definition for the undefined sym unless
9896 it is defined in a non-shared object and forced local.
9901 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
9902 if (version_index
== 1 || version_index
== 2)
9904 /* This is the base or first version. We can use it. */
9918 /* Convert ELF common symbol TYPE. */
9921 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
9923 /* Commom symbol can only appear in relocatable link. */
9924 if (!bfd_link_relocatable (info
))
9926 switch (info
->elf_stt_common
)
9930 case elf_stt_common
:
9933 case no_elf_stt_common
:
9940 /* Add an external symbol to the symbol table. This is called from
9941 the hash table traversal routine. When generating a shared object,
9942 we go through the symbol table twice. The first time we output
9943 anything that might have been forced to local scope in a version
9944 script. The second time we output the symbols that are still
9948 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
9950 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
9951 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
9952 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
9954 Elf_Internal_Sym sym
;
9955 asection
*input_sec
;
9956 const struct elf_backend_data
*bed
;
9961 if (h
->root
.type
== bfd_link_hash_warning
)
9963 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9964 if (h
->root
.type
== bfd_link_hash_new
)
9968 /* Decide whether to output this symbol in this pass. */
9969 if (eoinfo
->localsyms
)
9971 if (!h
->forced_local
)
9976 if (h
->forced_local
)
9980 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9982 if (h
->root
.type
== bfd_link_hash_undefined
)
9984 /* If we have an undefined symbol reference here then it must have
9985 come from a shared library that is being linked in. (Undefined
9986 references in regular files have already been handled unless
9987 they are in unreferenced sections which are removed by garbage
9989 bfd_boolean ignore_undef
= FALSE
;
9991 /* Some symbols may be special in that the fact that they're
9992 undefined can be safely ignored - let backend determine that. */
9993 if (bed
->elf_backend_ignore_undef_symbol
)
9994 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
9996 /* If we are reporting errors for this situation then do so now. */
9998 && h
->ref_dynamic_nonweak
9999 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
10000 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10001 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10003 flinfo
->info
->callbacks
->undefined_symbol
10004 (flinfo
->info
, h
->root
.root
.string
,
10005 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10006 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10007 && !flinfo
->info
->warn_unresolved_syms
);
10010 /* Strip a global symbol defined in a discarded section. */
10015 /* We should also warn if a forced local symbol is referenced from
10016 shared libraries. */
10017 if (bfd_link_executable (flinfo
->info
)
10022 && h
->ref_dynamic_nonweak
10023 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10027 struct elf_link_hash_entry
*hi
= h
;
10029 /* Check indirect symbol. */
10030 while (hi
->root
.type
== bfd_link_hash_indirect
)
10031 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10033 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10034 /* xgettext:c-format */
10035 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10036 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10037 /* xgettext:c-format */
10038 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10040 /* xgettext:c-format */
10041 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10042 def_bfd
= flinfo
->output_bfd
;
10043 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10044 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10045 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10046 h
->root
.root
.string
, def_bfd
);
10047 bfd_set_error (bfd_error_bad_value
);
10048 eoinfo
->failed
= TRUE
;
10052 /* We don't want to output symbols that have never been mentioned by
10053 a regular file, or that we have been told to strip. However, if
10054 h->indx is set to -2, the symbol is used by a reloc and we must
10059 else if ((h
->def_dynamic
10061 || h
->root
.type
== bfd_link_hash_new
)
10063 && !h
->ref_regular
)
10065 else if (flinfo
->info
->strip
== strip_all
)
10067 else if (flinfo
->info
->strip
== strip_some
10068 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10069 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
10071 else if ((h
->root
.type
== bfd_link_hash_defined
10072 || h
->root
.type
== bfd_link_hash_defweak
)
10073 && ((flinfo
->info
->strip_discarded
10074 && discarded_section (h
->root
.u
.def
.section
))
10075 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10076 && h
->root
.u
.def
.section
->owner
!= NULL
10077 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10079 else if ((h
->root
.type
== bfd_link_hash_undefined
10080 || h
->root
.type
== bfd_link_hash_undefweak
)
10081 && h
->root
.u
.undef
.abfd
!= NULL
10082 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10087 /* If we're stripping it, and it's not a dynamic symbol, there's
10088 nothing else to do. However, if it is a forced local symbol or
10089 an ifunc symbol we need to give the backend finish_dynamic_symbol
10090 function a chance to make it dynamic. */
10092 && h
->dynindx
== -1
10093 && type
!= STT_GNU_IFUNC
10094 && !h
->forced_local
)
10098 sym
.st_size
= h
->size
;
10099 sym
.st_other
= h
->other
;
10100 switch (h
->root
.type
)
10103 case bfd_link_hash_new
:
10104 case bfd_link_hash_warning
:
10108 case bfd_link_hash_undefined
:
10109 case bfd_link_hash_undefweak
:
10110 input_sec
= bfd_und_section_ptr
;
10111 sym
.st_shndx
= SHN_UNDEF
;
10114 case bfd_link_hash_defined
:
10115 case bfd_link_hash_defweak
:
10117 input_sec
= h
->root
.u
.def
.section
;
10118 if (input_sec
->output_section
!= NULL
)
10121 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10122 input_sec
->output_section
);
10123 if (sym
.st_shndx
== SHN_BAD
)
10126 /* xgettext:c-format */
10127 (_("%pB: could not find output section %pA for input section %pA"),
10128 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10129 bfd_set_error (bfd_error_nonrepresentable_section
);
10130 eoinfo
->failed
= TRUE
;
10134 /* ELF symbols in relocatable files are section relative,
10135 but in nonrelocatable files they are virtual
10137 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10138 if (!bfd_link_relocatable (flinfo
->info
))
10140 sym
.st_value
+= input_sec
->output_section
->vma
;
10141 if (h
->type
== STT_TLS
)
10143 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10144 if (tls_sec
!= NULL
)
10145 sym
.st_value
-= tls_sec
->vma
;
10151 BFD_ASSERT (input_sec
->owner
== NULL
10152 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10153 sym
.st_shndx
= SHN_UNDEF
;
10154 input_sec
= bfd_und_section_ptr
;
10159 case bfd_link_hash_common
:
10160 input_sec
= h
->root
.u
.c
.p
->section
;
10161 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10162 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10165 case bfd_link_hash_indirect
:
10166 /* These symbols are created by symbol versioning. They point
10167 to the decorated version of the name. For example, if the
10168 symbol foo@@GNU_1.2 is the default, which should be used when
10169 foo is used with no version, then we add an indirect symbol
10170 foo which points to foo@@GNU_1.2. We ignore these symbols,
10171 since the indirected symbol is already in the hash table. */
10175 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10176 switch (h
->root
.type
)
10178 case bfd_link_hash_common
:
10179 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10181 case bfd_link_hash_defined
:
10182 case bfd_link_hash_defweak
:
10183 if (bed
->common_definition (&sym
))
10184 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10188 case bfd_link_hash_undefined
:
10189 case bfd_link_hash_undefweak
:
10195 if (h
->forced_local
)
10197 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10198 /* Turn off visibility on local symbol. */
10199 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10201 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10202 else if (h
->unique_global
&& h
->def_regular
)
10203 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10204 else if (h
->root
.type
== bfd_link_hash_undefweak
10205 || h
->root
.type
== bfd_link_hash_defweak
)
10206 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10208 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10209 sym
.st_target_internal
= h
->target_internal
;
10211 /* Give the processor backend a chance to tweak the symbol value,
10212 and also to finish up anything that needs to be done for this
10213 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10214 forced local syms when non-shared is due to a historical quirk.
10215 STT_GNU_IFUNC symbol must go through PLT. */
10216 if ((h
->type
== STT_GNU_IFUNC
10218 && !bfd_link_relocatable (flinfo
->info
))
10219 || ((h
->dynindx
!= -1
10220 || h
->forced_local
)
10221 && ((bfd_link_pic (flinfo
->info
)
10222 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10223 || h
->root
.type
!= bfd_link_hash_undefweak
))
10224 || !h
->forced_local
)
10225 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10227 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10228 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10230 eoinfo
->failed
= TRUE
;
10235 /* If we are marking the symbol as undefined, and there are no
10236 non-weak references to this symbol from a regular object, then
10237 mark the symbol as weak undefined; if there are non-weak
10238 references, mark the symbol as strong. We can't do this earlier,
10239 because it might not be marked as undefined until the
10240 finish_dynamic_symbol routine gets through with it. */
10241 if (sym
.st_shndx
== SHN_UNDEF
10243 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10244 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10247 type
= ELF_ST_TYPE (sym
.st_info
);
10249 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10250 if (type
== STT_GNU_IFUNC
)
10253 if (h
->ref_regular_nonweak
)
10254 bindtype
= STB_GLOBAL
;
10256 bindtype
= STB_WEAK
;
10257 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10260 /* If this is a symbol defined in a dynamic library, don't use the
10261 symbol size from the dynamic library. Relinking an executable
10262 against a new library may introduce gratuitous changes in the
10263 executable's symbols if we keep the size. */
10264 if (sym
.st_shndx
== SHN_UNDEF
10269 /* If a non-weak symbol with non-default visibility is not defined
10270 locally, it is a fatal error. */
10271 if (!bfd_link_relocatable (flinfo
->info
)
10272 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10273 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10274 && h
->root
.type
== bfd_link_hash_undefined
10275 && !h
->def_regular
)
10279 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10280 /* xgettext:c-format */
10281 msg
= _("%pB: protected symbol `%s' isn't defined");
10282 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10283 /* xgettext:c-format */
10284 msg
= _("%pB: internal symbol `%s' isn't defined");
10286 /* xgettext:c-format */
10287 msg
= _("%pB: hidden symbol `%s' isn't defined");
10288 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10289 bfd_set_error (bfd_error_bad_value
);
10290 eoinfo
->failed
= TRUE
;
10294 /* If this symbol should be put in the .dynsym section, then put it
10295 there now. We already know the symbol index. We also fill in
10296 the entry in the .hash section. */
10297 if (h
->dynindx
!= -1
10298 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10299 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10300 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10304 /* Since there is no version information in the dynamic string,
10305 if there is no version info in symbol version section, we will
10306 have a run-time problem if not linking executable, referenced
10307 by shared library, or not bound locally. */
10308 if (h
->verinfo
.verdef
== NULL
10309 && (!bfd_link_executable (flinfo
->info
)
10311 || !h
->def_regular
))
10313 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10315 if (p
&& p
[1] != '\0')
10318 /* xgettext:c-format */
10319 (_("%pB: no symbol version section for versioned symbol `%s'"),
10320 flinfo
->output_bfd
, h
->root
.root
.string
);
10321 eoinfo
->failed
= TRUE
;
10326 sym
.st_name
= h
->dynstr_index
;
10327 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10328 + h
->dynindx
* bed
->s
->sizeof_sym
);
10329 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10331 eoinfo
->failed
= TRUE
;
10334 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10336 if (flinfo
->hash_sec
!= NULL
)
10338 size_t hash_entry_size
;
10339 bfd_byte
*bucketpos
;
10341 size_t bucketcount
;
10344 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10345 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10348 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10349 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10350 + (bucket
+ 2) * hash_entry_size
);
10351 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10352 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10354 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10355 ((bfd_byte
*) flinfo
->hash_sec
->contents
10356 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10359 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10361 Elf_Internal_Versym iversym
;
10362 Elf_External_Versym
*eversym
;
10364 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10366 if (h
->verinfo
.verdef
== NULL
10367 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10368 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10369 iversym
.vs_vers
= 0;
10371 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10375 if (h
->verinfo
.vertree
== NULL
)
10376 iversym
.vs_vers
= 1;
10378 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10379 if (flinfo
->info
->create_default_symver
)
10383 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10384 defined locally. */
10385 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10386 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10388 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10389 eversym
+= h
->dynindx
;
10390 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10394 /* If the symbol is undefined, and we didn't output it to .dynsym,
10395 strip it from .symtab too. Obviously we can't do this for
10396 relocatable output or when needed for --emit-relocs. */
10397 else if (input_sec
== bfd_und_section_ptr
10399 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10400 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10401 && !bfd_link_relocatable (flinfo
->info
))
10404 /* Also strip others that we couldn't earlier due to dynamic symbol
10408 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10411 /* Output a FILE symbol so that following locals are not associated
10412 with the wrong input file. We need one for forced local symbols
10413 if we've seen more than one FILE symbol or when we have exactly
10414 one FILE symbol but global symbols are present in a file other
10415 than the one with the FILE symbol. We also need one if linker
10416 defined symbols are present. In practice these conditions are
10417 always met, so just emit the FILE symbol unconditionally. */
10418 if (eoinfo
->localsyms
10419 && !eoinfo
->file_sym_done
10420 && eoinfo
->flinfo
->filesym_count
!= 0)
10422 Elf_Internal_Sym fsym
;
10424 memset (&fsym
, 0, sizeof (fsym
));
10425 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10426 fsym
.st_shndx
= SHN_ABS
;
10427 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10428 bfd_und_section_ptr
, NULL
))
10431 eoinfo
->file_sym_done
= TRUE
;
10434 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10435 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10439 eoinfo
->failed
= TRUE
;
10444 else if (h
->indx
== -2)
10450 /* Return TRUE if special handling is done for relocs in SEC against
10451 symbols defined in discarded sections. */
10454 elf_section_ignore_discarded_relocs (asection
*sec
)
10456 const struct elf_backend_data
*bed
;
10458 switch (sec
->sec_info_type
)
10460 case SEC_INFO_TYPE_STABS
:
10461 case SEC_INFO_TYPE_EH_FRAME
:
10462 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10468 bed
= get_elf_backend_data (sec
->owner
);
10469 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10470 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10476 /* Return a mask saying how ld should treat relocations in SEC against
10477 symbols defined in discarded sections. If this function returns
10478 COMPLAIN set, ld will issue a warning message. If this function
10479 returns PRETEND set, and the discarded section was link-once and the
10480 same size as the kept link-once section, ld will pretend that the
10481 symbol was actually defined in the kept section. Otherwise ld will
10482 zero the reloc (at least that is the intent, but some cooperation by
10483 the target dependent code is needed, particularly for REL targets). */
10486 _bfd_elf_default_action_discarded (asection
*sec
)
10488 if (sec
->flags
& SEC_DEBUGGING
)
10491 if (strcmp (".eh_frame", sec
->name
) == 0)
10494 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10497 return COMPLAIN
| PRETEND
;
10500 /* Find a match between a section and a member of a section group. */
10503 match_group_member (asection
*sec
, asection
*group
,
10504 struct bfd_link_info
*info
)
10506 asection
*first
= elf_next_in_group (group
);
10507 asection
*s
= first
;
10511 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10514 s
= elf_next_in_group (s
);
10522 /* Check if the kept section of a discarded section SEC can be used
10523 to replace it. Return the replacement if it is OK. Otherwise return
10527 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10531 kept
= sec
->kept_section
;
10534 if ((kept
->flags
& SEC_GROUP
) != 0)
10535 kept
= match_group_member (sec
, kept
, info
);
10537 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10538 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
10540 sec
->kept_section
= kept
;
10545 /* Link an input file into the linker output file. This function
10546 handles all the sections and relocations of the input file at once.
10547 This is so that we only have to read the local symbols once, and
10548 don't have to keep them in memory. */
10551 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10553 int (*relocate_section
)
10554 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10555 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10557 Elf_Internal_Shdr
*symtab_hdr
;
10558 size_t locsymcount
;
10560 Elf_Internal_Sym
*isymbuf
;
10561 Elf_Internal_Sym
*isym
;
10562 Elf_Internal_Sym
*isymend
;
10564 asection
**ppsection
;
10566 const struct elf_backend_data
*bed
;
10567 struct elf_link_hash_entry
**sym_hashes
;
10568 bfd_size_type address_size
;
10569 bfd_vma r_type_mask
;
10571 bfd_boolean have_file_sym
= FALSE
;
10573 output_bfd
= flinfo
->output_bfd
;
10574 bed
= get_elf_backend_data (output_bfd
);
10575 relocate_section
= bed
->elf_backend_relocate_section
;
10577 /* If this is a dynamic object, we don't want to do anything here:
10578 we don't want the local symbols, and we don't want the section
10580 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10583 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10584 if (elf_bad_symtab (input_bfd
))
10586 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10591 locsymcount
= symtab_hdr
->sh_info
;
10592 extsymoff
= symtab_hdr
->sh_info
;
10595 /* Read the local symbols. */
10596 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10597 if (isymbuf
== NULL
&& locsymcount
!= 0)
10599 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10600 flinfo
->internal_syms
,
10601 flinfo
->external_syms
,
10602 flinfo
->locsym_shndx
);
10603 if (isymbuf
== NULL
)
10607 /* Find local symbol sections and adjust values of symbols in
10608 SEC_MERGE sections. Write out those local symbols we know are
10609 going into the output file. */
10610 isymend
= isymbuf
+ locsymcount
;
10611 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10613 isym
++, pindex
++, ppsection
++)
10617 Elf_Internal_Sym osym
;
10623 if (elf_bad_symtab (input_bfd
))
10625 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10632 if (isym
->st_shndx
== SHN_UNDEF
)
10633 isec
= bfd_und_section_ptr
;
10634 else if (isym
->st_shndx
== SHN_ABS
)
10635 isec
= bfd_abs_section_ptr
;
10636 else if (isym
->st_shndx
== SHN_COMMON
)
10637 isec
= bfd_com_section_ptr
;
10640 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10643 /* Don't attempt to output symbols with st_shnx in the
10644 reserved range other than SHN_ABS and SHN_COMMON. */
10645 isec
= bfd_und_section_ptr
;
10647 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10648 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10650 _bfd_merged_section_offset (output_bfd
, &isec
,
10651 elf_section_data (isec
)->sec_info
,
10657 /* Don't output the first, undefined, symbol. In fact, don't
10658 output any undefined local symbol. */
10659 if (isec
== bfd_und_section_ptr
)
10662 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10664 /* We never output section symbols. Instead, we use the
10665 section symbol of the corresponding section in the output
10670 /* If we are stripping all symbols, we don't want to output this
10672 if (flinfo
->info
->strip
== strip_all
)
10675 /* If we are discarding all local symbols, we don't want to
10676 output this one. If we are generating a relocatable output
10677 file, then some of the local symbols may be required by
10678 relocs; we output them below as we discover that they are
10680 if (flinfo
->info
->discard
== discard_all
)
10683 /* If this symbol is defined in a section which we are
10684 discarding, we don't need to keep it. */
10685 if (isym
->st_shndx
!= SHN_UNDEF
10686 && isym
->st_shndx
< SHN_LORESERVE
10687 && isec
->output_section
== NULL
10688 && flinfo
->info
->non_contiguous_regions
10689 && flinfo
->info
->non_contiguous_regions_warnings
)
10691 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10692 "discards section `%s' from '%s'\n"),
10693 isec
->name
, bfd_get_filename (isec
->owner
));
10697 if (isym
->st_shndx
!= SHN_UNDEF
10698 && isym
->st_shndx
< SHN_LORESERVE
10699 && bfd_section_removed_from_list (output_bfd
,
10700 isec
->output_section
))
10703 /* Get the name of the symbol. */
10704 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10709 /* See if we are discarding symbols with this name. */
10710 if ((flinfo
->info
->strip
== strip_some
10711 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
10713 || (((flinfo
->info
->discard
== discard_sec_merge
10714 && (isec
->flags
& SEC_MERGE
)
10715 && !bfd_link_relocatable (flinfo
->info
))
10716 || flinfo
->info
->discard
== discard_l
)
10717 && bfd_is_local_label_name (input_bfd
, name
)))
10720 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10722 if (input_bfd
->lto_output
)
10723 /* -flto puts a temp file name here. This means builds
10724 are not reproducible. Discard the symbol. */
10726 have_file_sym
= TRUE
;
10727 flinfo
->filesym_count
+= 1;
10729 if (!have_file_sym
)
10731 /* In the absence of debug info, bfd_find_nearest_line uses
10732 FILE symbols to determine the source file for local
10733 function symbols. Provide a FILE symbol here if input
10734 files lack such, so that their symbols won't be
10735 associated with a previous input file. It's not the
10736 source file, but the best we can do. */
10737 have_file_sym
= TRUE
;
10738 flinfo
->filesym_count
+= 1;
10739 memset (&osym
, 0, sizeof (osym
));
10740 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10741 osym
.st_shndx
= SHN_ABS
;
10742 if (!elf_link_output_symstrtab (flinfo
,
10743 (input_bfd
->lto_output
? NULL
10744 : bfd_get_filename (input_bfd
)),
10745 &osym
, bfd_abs_section_ptr
,
10752 /* Adjust the section index for the output file. */
10753 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10754 isec
->output_section
);
10755 if (osym
.st_shndx
== SHN_BAD
)
10758 /* ELF symbols in relocatable files are section relative, but
10759 in executable files they are virtual addresses. Note that
10760 this code assumes that all ELF sections have an associated
10761 BFD section with a reasonable value for output_offset; below
10762 we assume that they also have a reasonable value for
10763 output_section. Any special sections must be set up to meet
10764 these requirements. */
10765 osym
.st_value
+= isec
->output_offset
;
10766 if (!bfd_link_relocatable (flinfo
->info
))
10768 osym
.st_value
+= isec
->output_section
->vma
;
10769 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
10771 /* STT_TLS symbols are relative to PT_TLS segment base. */
10772 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
10773 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
10775 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
10780 indx
= bfd_get_symcount (output_bfd
);
10781 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
10788 if (bed
->s
->arch_size
== 32)
10790 r_type_mask
= 0xff;
10796 r_type_mask
= 0xffffffff;
10801 /* Relocate the contents of each section. */
10802 sym_hashes
= elf_sym_hashes (input_bfd
);
10803 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
10805 bfd_byte
*contents
;
10807 if (! o
->linker_mark
)
10809 /* This section was omitted from the link. */
10813 if (!flinfo
->info
->resolve_section_groups
10814 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
10816 /* Deal with the group signature symbol. */
10817 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
10818 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
10819 asection
*osec
= o
->output_section
;
10821 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
10822 if (symndx
>= locsymcount
10823 || (elf_bad_symtab (input_bfd
)
10824 && flinfo
->sections
[symndx
] == NULL
))
10826 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
10827 while (h
->root
.type
== bfd_link_hash_indirect
10828 || h
->root
.type
== bfd_link_hash_warning
)
10829 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10830 /* Arrange for symbol to be output. */
10832 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
10834 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
10836 /* We'll use the output section target_index. */
10837 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10838 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
10842 if (flinfo
->indices
[symndx
] == -1)
10844 /* Otherwise output the local symbol now. */
10845 Elf_Internal_Sym sym
= isymbuf
[symndx
];
10846 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10851 name
= bfd_elf_string_from_elf_section (input_bfd
,
10852 symtab_hdr
->sh_link
,
10857 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10859 if (sym
.st_shndx
== SHN_BAD
)
10862 sym
.st_value
+= o
->output_offset
;
10864 indx
= bfd_get_symcount (output_bfd
);
10865 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
10870 flinfo
->indices
[symndx
] = indx
;
10874 elf_section_data (osec
)->this_hdr
.sh_info
10875 = flinfo
->indices
[symndx
];
10879 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10880 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
10883 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
10885 /* Section was created by _bfd_elf_link_create_dynamic_sections
10890 /* Get the contents of the section. They have been cached by a
10891 relaxation routine. Note that o is a section in an input
10892 file, so the contents field will not have been set by any of
10893 the routines which work on output files. */
10894 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
10896 contents
= elf_section_data (o
)->this_hdr
.contents
;
10897 if (bed
->caches_rawsize
10899 && o
->rawsize
< o
->size
)
10901 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
10902 contents
= flinfo
->contents
;
10907 contents
= flinfo
->contents
;
10908 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
10912 if ((o
->flags
& SEC_RELOC
) != 0)
10914 Elf_Internal_Rela
*internal_relocs
;
10915 Elf_Internal_Rela
*rel
, *relend
;
10916 int action_discarded
;
10919 /* Get the swapped relocs. */
10921 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
10922 flinfo
->internal_relocs
, FALSE
);
10923 if (internal_relocs
== NULL
10924 && o
->reloc_count
> 0)
10927 /* We need to reverse-copy input .ctors/.dtors sections if
10928 they are placed in .init_array/.finit_array for output. */
10929 if (o
->size
> address_size
10930 && ((strncmp (o
->name
, ".ctors", 6) == 0
10931 && strcmp (o
->output_section
->name
,
10932 ".init_array") == 0)
10933 || (strncmp (o
->name
, ".dtors", 6) == 0
10934 && strcmp (o
->output_section
->name
,
10935 ".fini_array") == 0))
10936 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
10938 if (o
->size
* bed
->s
->int_rels_per_ext_rel
10939 != o
->reloc_count
* address_size
)
10942 /* xgettext:c-format */
10943 (_("error: %pB: size of section %pA is not "
10944 "multiple of address size"),
10946 bfd_set_error (bfd_error_bad_value
);
10949 o
->flags
|= SEC_ELF_REVERSE_COPY
;
10952 action_discarded
= -1;
10953 if (!elf_section_ignore_discarded_relocs (o
))
10954 action_discarded
= (*bed
->action_discarded
) (o
);
10956 /* Run through the relocs evaluating complex reloc symbols and
10957 looking for relocs against symbols from discarded sections
10958 or section symbols from removed link-once sections.
10959 Complain about relocs against discarded sections. Zero
10960 relocs against removed link-once sections. */
10962 rel
= internal_relocs
;
10963 relend
= rel
+ o
->reloc_count
;
10964 for ( ; rel
< relend
; rel
++)
10966 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
10967 unsigned int s_type
;
10968 asection
**ps
, *sec
;
10969 struct elf_link_hash_entry
*h
= NULL
;
10970 const char *sym_name
;
10972 if (r_symndx
== STN_UNDEF
)
10975 if (r_symndx
>= locsymcount
10976 || (elf_bad_symtab (input_bfd
)
10977 && flinfo
->sections
[r_symndx
] == NULL
))
10979 h
= sym_hashes
[r_symndx
- extsymoff
];
10981 /* Badly formatted input files can contain relocs that
10982 reference non-existant symbols. Check here so that
10983 we do not seg fault. */
10987 /* xgettext:c-format */
10988 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
10989 "that references a non-existent global symbol"),
10990 input_bfd
, (uint64_t) rel
->r_info
, o
);
10991 bfd_set_error (bfd_error_bad_value
);
10995 while (h
->root
.type
== bfd_link_hash_indirect
10996 || h
->root
.type
== bfd_link_hash_warning
)
10997 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11001 /* If a plugin symbol is referenced from a non-IR file,
11002 mark the symbol as undefined. Note that the
11003 linker may attach linker created dynamic sections
11004 to the plugin bfd. Symbols defined in linker
11005 created sections are not plugin symbols. */
11006 if ((h
->root
.non_ir_ref_regular
11007 || h
->root
.non_ir_ref_dynamic
)
11008 && (h
->root
.type
== bfd_link_hash_defined
11009 || h
->root
.type
== bfd_link_hash_defweak
)
11010 && (h
->root
.u
.def
.section
->flags
11011 & SEC_LINKER_CREATED
) == 0
11012 && h
->root
.u
.def
.section
->owner
!= NULL
11013 && (h
->root
.u
.def
.section
->owner
->flags
11014 & BFD_PLUGIN
) != 0)
11016 h
->root
.type
= bfd_link_hash_undefined
;
11017 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11021 if (h
->root
.type
== bfd_link_hash_defined
11022 || h
->root
.type
== bfd_link_hash_defweak
)
11023 ps
= &h
->root
.u
.def
.section
;
11025 sym_name
= h
->root
.root
.string
;
11029 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11031 s_type
= ELF_ST_TYPE (sym
->st_info
);
11032 ps
= &flinfo
->sections
[r_symndx
];
11033 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11037 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11038 && !bfd_link_relocatable (flinfo
->info
))
11041 bfd_vma dot
= (rel
->r_offset
11042 + o
->output_offset
+ o
->output_section
->vma
);
11044 printf ("Encountered a complex symbol!");
11045 printf (" (input_bfd %s, section %s, reloc %ld\n",
11046 bfd_get_filename (input_bfd
), o
->name
,
11047 (long) (rel
- internal_relocs
));
11048 printf (" symbol: idx %8.8lx, name %s\n",
11049 r_symndx
, sym_name
);
11050 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11051 (unsigned long) rel
->r_info
,
11052 (unsigned long) rel
->r_offset
);
11054 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11055 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11058 /* Symbol evaluated OK. Update to absolute value. */
11059 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11064 if (action_discarded
!= -1 && ps
!= NULL
)
11066 /* Complain if the definition comes from a
11067 discarded section. */
11068 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11070 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11071 if (action_discarded
& COMPLAIN
)
11072 (*flinfo
->info
->callbacks
->einfo
)
11073 /* xgettext:c-format */
11074 (_("%X`%s' referenced in section `%pA' of %pB: "
11075 "defined in discarded section `%pA' of %pB\n"),
11076 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11078 /* Try to do the best we can to support buggy old
11079 versions of gcc. Pretend that the symbol is
11080 really defined in the kept linkonce section.
11081 FIXME: This is quite broken. Modifying the
11082 symbol here means we will be changing all later
11083 uses of the symbol, not just in this section. */
11084 if (action_discarded
& PRETEND
)
11088 kept
= _bfd_elf_check_kept_section (sec
,
11100 /* Relocate the section by invoking a back end routine.
11102 The back end routine is responsible for adjusting the
11103 section contents as necessary, and (if using Rela relocs
11104 and generating a relocatable output file) adjusting the
11105 reloc addend as necessary.
11107 The back end routine does not have to worry about setting
11108 the reloc address or the reloc symbol index.
11110 The back end routine is given a pointer to the swapped in
11111 internal symbols, and can access the hash table entries
11112 for the external symbols via elf_sym_hashes (input_bfd).
11114 When generating relocatable output, the back end routine
11115 must handle STB_LOCAL/STT_SECTION symbols specially. The
11116 output symbol is going to be a section symbol
11117 corresponding to the output section, which will require
11118 the addend to be adjusted. */
11120 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11121 input_bfd
, o
, contents
,
11129 || bfd_link_relocatable (flinfo
->info
)
11130 || flinfo
->info
->emitrelocations
)
11132 Elf_Internal_Rela
*irela
;
11133 Elf_Internal_Rela
*irelaend
, *irelamid
;
11134 bfd_vma last_offset
;
11135 struct elf_link_hash_entry
**rel_hash
;
11136 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11137 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11138 unsigned int next_erel
;
11139 bfd_boolean rela_normal
;
11140 struct bfd_elf_section_data
*esdi
, *esdo
;
11142 esdi
= elf_section_data (o
);
11143 esdo
= elf_section_data (o
->output_section
);
11144 rela_normal
= FALSE
;
11146 /* Adjust the reloc addresses and symbol indices. */
11148 irela
= internal_relocs
;
11149 irelaend
= irela
+ o
->reloc_count
;
11150 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11151 /* We start processing the REL relocs, if any. When we reach
11152 IRELAMID in the loop, we switch to the RELA relocs. */
11154 if (esdi
->rel
.hdr
!= NULL
)
11155 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11156 * bed
->s
->int_rels_per_ext_rel
);
11157 rel_hash_list
= rel_hash
;
11158 rela_hash_list
= NULL
;
11159 last_offset
= o
->output_offset
;
11160 if (!bfd_link_relocatable (flinfo
->info
))
11161 last_offset
+= o
->output_section
->vma
;
11162 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11164 unsigned long r_symndx
;
11166 Elf_Internal_Sym sym
;
11168 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11174 if (irela
== irelamid
)
11176 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11177 rela_hash_list
= rel_hash
;
11178 rela_normal
= bed
->rela_normal
;
11181 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11184 if (irela
->r_offset
>= (bfd_vma
) -2)
11186 /* This is a reloc for a deleted entry or somesuch.
11187 Turn it into an R_*_NONE reloc, at the same
11188 offset as the last reloc. elf_eh_frame.c and
11189 bfd_elf_discard_info rely on reloc offsets
11191 irela
->r_offset
= last_offset
;
11193 irela
->r_addend
= 0;
11197 irela
->r_offset
+= o
->output_offset
;
11199 /* Relocs in an executable have to be virtual addresses. */
11200 if (!bfd_link_relocatable (flinfo
->info
))
11201 irela
->r_offset
+= o
->output_section
->vma
;
11203 last_offset
= irela
->r_offset
;
11205 r_symndx
= irela
->r_info
>> r_sym_shift
;
11206 if (r_symndx
== STN_UNDEF
)
11209 if (r_symndx
>= locsymcount
11210 || (elf_bad_symtab (input_bfd
)
11211 && flinfo
->sections
[r_symndx
] == NULL
))
11213 struct elf_link_hash_entry
*rh
;
11214 unsigned long indx
;
11216 /* This is a reloc against a global symbol. We
11217 have not yet output all the local symbols, so
11218 we do not know the symbol index of any global
11219 symbol. We set the rel_hash entry for this
11220 reloc to point to the global hash table entry
11221 for this symbol. The symbol index is then
11222 set at the end of bfd_elf_final_link. */
11223 indx
= r_symndx
- extsymoff
;
11224 rh
= elf_sym_hashes (input_bfd
)[indx
];
11225 while (rh
->root
.type
== bfd_link_hash_indirect
11226 || rh
->root
.type
== bfd_link_hash_warning
)
11227 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11229 /* Setting the index to -2 tells
11230 elf_link_output_extsym that this symbol is
11231 used by a reloc. */
11232 BFD_ASSERT (rh
->indx
< 0);
11239 /* This is a reloc against a local symbol. */
11242 sym
= isymbuf
[r_symndx
];
11243 sec
= flinfo
->sections
[r_symndx
];
11244 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11246 /* I suppose the backend ought to fill in the
11247 section of any STT_SECTION symbol against a
11248 processor specific section. */
11249 r_symndx
= STN_UNDEF
;
11250 if (bfd_is_abs_section (sec
))
11252 else if (sec
== NULL
|| sec
->owner
== NULL
)
11254 bfd_set_error (bfd_error_bad_value
);
11259 asection
*osec
= sec
->output_section
;
11261 /* If we have discarded a section, the output
11262 section will be the absolute section. In
11263 case of discarded SEC_MERGE sections, use
11264 the kept section. relocate_section should
11265 have already handled discarded linkonce
11267 if (bfd_is_abs_section (osec
)
11268 && sec
->kept_section
!= NULL
11269 && sec
->kept_section
->output_section
!= NULL
)
11271 osec
= sec
->kept_section
->output_section
;
11272 irela
->r_addend
-= osec
->vma
;
11275 if (!bfd_is_abs_section (osec
))
11277 r_symndx
= osec
->target_index
;
11278 if (r_symndx
== STN_UNDEF
)
11280 irela
->r_addend
+= osec
->vma
;
11281 osec
= _bfd_nearby_section (output_bfd
, osec
,
11283 irela
->r_addend
-= osec
->vma
;
11284 r_symndx
= osec
->target_index
;
11289 /* Adjust the addend according to where the
11290 section winds up in the output section. */
11292 irela
->r_addend
+= sec
->output_offset
;
11296 if (flinfo
->indices
[r_symndx
] == -1)
11298 unsigned long shlink
;
11303 if (flinfo
->info
->strip
== strip_all
)
11305 /* You can't do ld -r -s. */
11306 bfd_set_error (bfd_error_invalid_operation
);
11310 /* This symbol was skipped earlier, but
11311 since it is needed by a reloc, we
11312 must output it now. */
11313 shlink
= symtab_hdr
->sh_link
;
11314 name
= (bfd_elf_string_from_elf_section
11315 (input_bfd
, shlink
, sym
.st_name
));
11319 osec
= sec
->output_section
;
11321 _bfd_elf_section_from_bfd_section (output_bfd
,
11323 if (sym
.st_shndx
== SHN_BAD
)
11326 sym
.st_value
+= sec
->output_offset
;
11327 if (!bfd_link_relocatable (flinfo
->info
))
11329 sym
.st_value
+= osec
->vma
;
11330 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11332 struct elf_link_hash_table
*htab
11333 = elf_hash_table (flinfo
->info
);
11335 /* STT_TLS symbols are relative to PT_TLS
11337 if (htab
->tls_sec
!= NULL
)
11338 sym
.st_value
-= htab
->tls_sec
->vma
;
11341 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11346 indx
= bfd_get_symcount (output_bfd
);
11347 ret
= elf_link_output_symstrtab (flinfo
, name
,
11353 flinfo
->indices
[r_symndx
] = indx
;
11358 r_symndx
= flinfo
->indices
[r_symndx
];
11361 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11362 | (irela
->r_info
& r_type_mask
));
11365 /* Swap out the relocs. */
11366 input_rel_hdr
= esdi
->rel
.hdr
;
11367 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11369 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11374 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11375 * bed
->s
->int_rels_per_ext_rel
);
11376 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11379 input_rela_hdr
= esdi
->rela
.hdr
;
11380 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11382 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11391 /* Write out the modified section contents. */
11392 if (bed
->elf_backend_write_section
11393 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11396 /* Section written out. */
11398 else switch (o
->sec_info_type
)
11400 case SEC_INFO_TYPE_STABS
:
11401 if (! (_bfd_write_section_stabs
11403 &elf_hash_table (flinfo
->info
)->stab_info
,
11404 o
, &elf_section_data (o
)->sec_info
, contents
)))
11407 case SEC_INFO_TYPE_MERGE
:
11408 if (! _bfd_write_merged_section (output_bfd
, o
,
11409 elf_section_data (o
)->sec_info
))
11412 case SEC_INFO_TYPE_EH_FRAME
:
11414 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11419 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11421 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11429 if (! (o
->flags
& SEC_EXCLUDE
))
11431 file_ptr offset
= (file_ptr
) o
->output_offset
;
11432 bfd_size_type todo
= o
->size
;
11434 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11436 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11438 /* Reverse-copy input section to output. */
11441 todo
-= address_size
;
11442 if (! bfd_set_section_contents (output_bfd
,
11450 offset
+= address_size
;
11454 else if (! bfd_set_section_contents (output_bfd
,
11468 /* Generate a reloc when linking an ELF file. This is a reloc
11469 requested by the linker, and does not come from any input file. This
11470 is used to build constructor and destructor tables when linking
11474 elf_reloc_link_order (bfd
*output_bfd
,
11475 struct bfd_link_info
*info
,
11476 asection
*output_section
,
11477 struct bfd_link_order
*link_order
)
11479 reloc_howto_type
*howto
;
11483 struct bfd_elf_section_reloc_data
*reldata
;
11484 struct elf_link_hash_entry
**rel_hash_ptr
;
11485 Elf_Internal_Shdr
*rel_hdr
;
11486 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11487 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11490 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11492 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11495 bfd_set_error (bfd_error_bad_value
);
11499 addend
= link_order
->u
.reloc
.p
->addend
;
11502 reldata
= &esdo
->rel
;
11503 else if (esdo
->rela
.hdr
)
11504 reldata
= &esdo
->rela
;
11511 /* Figure out the symbol index. */
11512 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11513 if (link_order
->type
== bfd_section_reloc_link_order
)
11515 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11516 BFD_ASSERT (indx
!= 0);
11517 *rel_hash_ptr
= NULL
;
11521 struct elf_link_hash_entry
*h
;
11523 /* Treat a reloc against a defined symbol as though it were
11524 actually against the section. */
11525 h
= ((struct elf_link_hash_entry
*)
11526 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11527 link_order
->u
.reloc
.p
->u
.name
,
11528 FALSE
, FALSE
, TRUE
));
11530 && (h
->root
.type
== bfd_link_hash_defined
11531 || h
->root
.type
== bfd_link_hash_defweak
))
11535 section
= h
->root
.u
.def
.section
;
11536 indx
= section
->output_section
->target_index
;
11537 *rel_hash_ptr
= NULL
;
11538 /* It seems that we ought to add the symbol value to the
11539 addend here, but in practice it has already been added
11540 because it was passed to constructor_callback. */
11541 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11543 else if (h
!= NULL
)
11545 /* Setting the index to -2 tells elf_link_output_extsym that
11546 this symbol is used by a reloc. */
11553 (*info
->callbacks
->unattached_reloc
)
11554 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11559 /* If this is an inplace reloc, we must write the addend into the
11561 if (howto
->partial_inplace
&& addend
!= 0)
11563 bfd_size_type size
;
11564 bfd_reloc_status_type rstat
;
11567 const char *sym_name
;
11568 bfd_size_type octets
;
11570 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11571 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11572 if (buf
== NULL
&& size
!= 0)
11574 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11581 case bfd_reloc_outofrange
:
11584 case bfd_reloc_overflow
:
11585 if (link_order
->type
== bfd_section_reloc_link_order
)
11586 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11588 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11589 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11590 howto
->name
, addend
, NULL
, NULL
,
11595 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11597 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11604 /* The address of a reloc is relative to the section in a
11605 relocatable file, and is a virtual address in an executable
11607 offset
= link_order
->offset
;
11608 if (! bfd_link_relocatable (info
))
11609 offset
+= output_section
->vma
;
11611 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11613 irel
[i
].r_offset
= offset
;
11614 irel
[i
].r_info
= 0;
11615 irel
[i
].r_addend
= 0;
11617 if (bed
->s
->arch_size
== 32)
11618 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11620 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11622 rel_hdr
= reldata
->hdr
;
11623 erel
= rel_hdr
->contents
;
11624 if (rel_hdr
->sh_type
== SHT_REL
)
11626 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11627 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11631 irel
[0].r_addend
= addend
;
11632 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11633 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11642 /* Compare two sections based on the locations of the sections they are
11643 linked to. Used by elf_fixup_link_order. */
11646 compare_link_order (const void *a
, const void *b
)
11648 const struct bfd_link_order
*alo
= *(const struct bfd_link_order
**) a
;
11649 const struct bfd_link_order
*blo
= *(const struct bfd_link_order
**) b
;
11650 asection
*asec
= elf_linked_to_section (alo
->u
.indirect
.section
);
11651 asection
*bsec
= elf_linked_to_section (blo
->u
.indirect
.section
);
11652 bfd_vma apos
= asec
->output_section
->lma
+ asec
->output_offset
;
11653 bfd_vma bpos
= bsec
->output_section
->lma
+ bsec
->output_offset
;
11660 /* The only way we should get matching LMAs is when the first of two
11661 sections has zero size. */
11662 if (asec
->size
< bsec
->size
)
11664 if (asec
->size
> bsec
->size
)
11667 /* If they are both zero size then they almost certainly have the same
11668 VMA and thus are not ordered with respect to each other. Test VMA
11669 anyway, and fall back to id to make the result reproducible across
11670 qsort implementations. */
11671 apos
= asec
->output_section
->vma
+ asec
->output_offset
;
11672 bpos
= bsec
->output_section
->vma
+ bsec
->output_offset
;
11678 return asec
->id
- bsec
->id
;
11682 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
11683 order as their linked sections. Returns false if this could not be done
11684 because an output section includes both ordered and unordered
11685 sections. Ideally we'd do this in the linker proper. */
11688 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
11690 size_t seen_linkorder
;
11693 struct bfd_link_order
*p
;
11695 struct bfd_link_order
**sections
;
11696 asection
*other_sec
, *linkorder_sec
;
11697 bfd_vma offset
; /* Octets. */
11700 linkorder_sec
= NULL
;
11702 seen_linkorder
= 0;
11703 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11705 if (p
->type
== bfd_indirect_link_order
)
11707 asection
*s
= p
->u
.indirect
.section
;
11709 if ((s
->flags
& SEC_LINKER_CREATED
) == 0
11710 && bfd_get_flavour (sub
) == bfd_target_elf_flavour
11711 && elf_section_data (s
) != NULL
11712 && elf_linked_to_section (s
) != NULL
)
11726 if (seen_other
&& seen_linkorder
)
11728 if (other_sec
&& linkorder_sec
)
11730 /* xgettext:c-format */
11731 (_("%pA has both ordered [`%pA' in %pB] "
11732 "and unordered [`%pA' in %pB] sections"),
11733 o
, linkorder_sec
, linkorder_sec
->owner
,
11734 other_sec
, other_sec
->owner
);
11737 (_("%pA has both ordered and unordered sections"), o
);
11738 bfd_set_error (bfd_error_bad_value
);
11743 if (!seen_linkorder
)
11746 sections
= bfd_malloc (seen_linkorder
* sizeof (*sections
));
11747 if (sections
== NULL
)
11750 seen_linkorder
= 0;
11751 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11752 sections
[seen_linkorder
++] = p
;
11754 /* Sort the input sections in the order of their linked section. */
11755 qsort (sections
, seen_linkorder
, sizeof (*sections
), compare_link_order
);
11757 /* Change the offsets of the sections. */
11759 for (n
= 0; n
< seen_linkorder
; n
++)
11762 asection
*s
= sections
[n
]->u
.indirect
.section
;
11763 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
11765 mask
= ~(bfd_vma
) 0 << s
->alignment_power
* opb
;
11766 offset
= (offset
+ ~mask
) & mask
;
11767 sections
[n
]->offset
= s
->output_offset
= offset
/ opb
;
11768 offset
+= sections
[n
]->size
;
11775 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11776 Returns TRUE upon success, FALSE otherwise. */
11779 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11781 bfd_boolean ret
= FALSE
;
11783 const struct elf_backend_data
*bed
;
11785 enum bfd_architecture arch
;
11787 asymbol
**sympp
= NULL
;
11791 elf_symbol_type
*osymbuf
;
11794 implib_bfd
= info
->out_implib_bfd
;
11795 bed
= get_elf_backend_data (abfd
);
11797 if (!bfd_set_format (implib_bfd
, bfd_object
))
11800 /* Use flag from executable but make it a relocatable object. */
11801 flags
= bfd_get_file_flags (abfd
);
11802 flags
&= ~HAS_RELOC
;
11803 if (!bfd_set_start_address (implib_bfd
, 0)
11804 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11807 /* Copy architecture of output file to import library file. */
11808 arch
= bfd_get_arch (abfd
);
11809 mach
= bfd_get_mach (abfd
);
11810 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11811 && (abfd
->target_defaulted
11812 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11815 /* Get symbol table size. */
11816 symsize
= bfd_get_symtab_upper_bound (abfd
);
11820 /* Read in the symbol table. */
11821 sympp
= (asymbol
**) bfd_malloc (symsize
);
11825 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11829 /* Allow the BFD backend to copy any private header data it
11830 understands from the output BFD to the import library BFD. */
11831 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11834 /* Filter symbols to appear in the import library. */
11835 if (bed
->elf_backend_filter_implib_symbols
)
11836 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11839 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11842 bfd_set_error (bfd_error_no_symbols
);
11843 _bfd_error_handler (_("%pB: no symbol found for import library"),
11849 /* Make symbols absolute. */
11850 amt
= symcount
* sizeof (*osymbuf
);
11851 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11852 if (osymbuf
== NULL
)
11855 for (src_count
= 0; src_count
< symcount
; src_count
++)
11857 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11858 sizeof (*osymbuf
));
11859 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11860 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11861 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11862 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11863 osymbuf
[src_count
].symbol
.value
;
11864 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11867 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
11869 /* Allow the BFD backend to copy any private data it understands
11870 from the output BFD to the import library BFD. This is done last
11871 to permit the routine to look at the filtered symbol table. */
11872 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
11875 if (!bfd_close (implib_bfd
))
11886 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
11890 if (flinfo
->symstrtab
!= NULL
)
11891 _bfd_elf_strtab_free (flinfo
->symstrtab
);
11892 free (flinfo
->contents
);
11893 free (flinfo
->external_relocs
);
11894 free (flinfo
->internal_relocs
);
11895 free (flinfo
->external_syms
);
11896 free (flinfo
->locsym_shndx
);
11897 free (flinfo
->internal_syms
);
11898 free (flinfo
->indices
);
11899 free (flinfo
->sections
);
11900 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
11901 free (flinfo
->symshndxbuf
);
11902 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
11904 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11905 free (esdo
->rel
.hashes
);
11906 free (esdo
->rela
.hashes
);
11910 /* Do the final step of an ELF link. */
11913 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
11915 bfd_boolean dynamic
;
11916 bfd_boolean emit_relocs
;
11918 struct elf_final_link_info flinfo
;
11920 struct bfd_link_order
*p
;
11922 bfd_size_type max_contents_size
;
11923 bfd_size_type max_external_reloc_size
;
11924 bfd_size_type max_internal_reloc_count
;
11925 bfd_size_type max_sym_count
;
11926 bfd_size_type max_sym_shndx_count
;
11927 Elf_Internal_Sym elfsym
;
11929 Elf_Internal_Shdr
*symtab_hdr
;
11930 Elf_Internal_Shdr
*symtab_shndx_hdr
;
11931 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11932 struct elf_outext_info eoinfo
;
11933 bfd_boolean merged
;
11934 size_t relativecount
= 0;
11935 asection
*reldyn
= 0;
11937 asection
*attr_section
= NULL
;
11938 bfd_vma attr_size
= 0;
11939 const char *std_attrs_section
;
11940 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
11941 bfd_boolean sections_removed
;
11943 if (!is_elf_hash_table (htab
))
11946 if (bfd_link_pic (info
))
11947 abfd
->flags
|= DYNAMIC
;
11949 dynamic
= htab
->dynamic_sections_created
;
11950 dynobj
= htab
->dynobj
;
11952 emit_relocs
= (bfd_link_relocatable (info
)
11953 || info
->emitrelocations
);
11955 flinfo
.info
= info
;
11956 flinfo
.output_bfd
= abfd
;
11957 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
11958 if (flinfo
.symstrtab
== NULL
)
11963 flinfo
.hash_sec
= NULL
;
11964 flinfo
.symver_sec
= NULL
;
11968 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
11969 /* Note that dynsym_sec can be NULL (on VMS). */
11970 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
11971 /* Note that it is OK if symver_sec is NULL. */
11974 flinfo
.contents
= NULL
;
11975 flinfo
.external_relocs
= NULL
;
11976 flinfo
.internal_relocs
= NULL
;
11977 flinfo
.external_syms
= NULL
;
11978 flinfo
.locsym_shndx
= NULL
;
11979 flinfo
.internal_syms
= NULL
;
11980 flinfo
.indices
= NULL
;
11981 flinfo
.sections
= NULL
;
11982 flinfo
.symshndxbuf
= NULL
;
11983 flinfo
.filesym_count
= 0;
11985 /* The object attributes have been merged. Remove the input
11986 sections from the link, and set the contents of the output
11988 sections_removed
= FALSE
;
11989 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
11990 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11992 bfd_boolean remove_section
= FALSE
;
11994 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
11995 || strcmp (o
->name
, ".gnu.attributes") == 0)
11997 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11999 asection
*input_section
;
12001 if (p
->type
!= bfd_indirect_link_order
)
12003 input_section
= p
->u
.indirect
.section
;
12004 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12005 elf_link_input_bfd ignores this section. */
12006 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12009 attr_size
= bfd_elf_obj_attr_size (abfd
);
12010 bfd_set_section_size (o
, attr_size
);
12011 /* Skip this section later on. */
12012 o
->map_head
.link_order
= NULL
;
12016 remove_section
= TRUE
;
12018 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12020 /* Remove empty group section from linker output. */
12021 remove_section
= TRUE
;
12023 if (remove_section
)
12025 o
->flags
|= SEC_EXCLUDE
;
12026 bfd_section_list_remove (abfd
, o
);
12027 abfd
->section_count
--;
12028 sections_removed
= TRUE
;
12031 if (sections_removed
)
12032 _bfd_fix_excluded_sec_syms (abfd
, info
);
12034 /* Count up the number of relocations we will output for each output
12035 section, so that we know the sizes of the reloc sections. We
12036 also figure out some maximum sizes. */
12037 max_contents_size
= 0;
12038 max_external_reloc_size
= 0;
12039 max_internal_reloc_count
= 0;
12041 max_sym_shndx_count
= 0;
12043 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12045 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12046 o
->reloc_count
= 0;
12048 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12050 unsigned int reloc_count
= 0;
12051 unsigned int additional_reloc_count
= 0;
12052 struct bfd_elf_section_data
*esdi
= NULL
;
12054 if (p
->type
== bfd_section_reloc_link_order
12055 || p
->type
== bfd_symbol_reloc_link_order
)
12057 else if (p
->type
== bfd_indirect_link_order
)
12061 sec
= p
->u
.indirect
.section
;
12063 /* Mark all sections which are to be included in the
12064 link. This will normally be every section. We need
12065 to do this so that we can identify any sections which
12066 the linker has decided to not include. */
12067 sec
->linker_mark
= TRUE
;
12069 if (sec
->flags
& SEC_MERGE
)
12072 if (sec
->rawsize
> max_contents_size
)
12073 max_contents_size
= sec
->rawsize
;
12074 if (sec
->size
> max_contents_size
)
12075 max_contents_size
= sec
->size
;
12077 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12078 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12082 /* We are interested in just local symbols, not all
12084 if (elf_bad_symtab (sec
->owner
))
12085 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12086 / bed
->s
->sizeof_sym
);
12088 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12090 if (sym_count
> max_sym_count
)
12091 max_sym_count
= sym_count
;
12093 if (sym_count
> max_sym_shndx_count
12094 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12095 max_sym_shndx_count
= sym_count
;
12097 if (esdo
->this_hdr
.sh_type
== SHT_REL
12098 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12099 /* Some backends use reloc_count in relocation sections
12100 to count particular types of relocs. Of course,
12101 reloc sections themselves can't have relocations. */
12103 else if (emit_relocs
)
12105 reloc_count
= sec
->reloc_count
;
12106 if (bed
->elf_backend_count_additional_relocs
)
12109 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12110 additional_reloc_count
+= c
;
12113 else if (bed
->elf_backend_count_relocs
)
12114 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12116 esdi
= elf_section_data (sec
);
12118 if ((sec
->flags
& SEC_RELOC
) != 0)
12120 size_t ext_size
= 0;
12122 if (esdi
->rel
.hdr
!= NULL
)
12123 ext_size
= esdi
->rel
.hdr
->sh_size
;
12124 if (esdi
->rela
.hdr
!= NULL
)
12125 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12127 if (ext_size
> max_external_reloc_size
)
12128 max_external_reloc_size
= ext_size
;
12129 if (sec
->reloc_count
> max_internal_reloc_count
)
12130 max_internal_reloc_count
= sec
->reloc_count
;
12135 if (reloc_count
== 0)
12138 reloc_count
+= additional_reloc_count
;
12139 o
->reloc_count
+= reloc_count
;
12141 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12145 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12146 esdo
->rel
.count
+= additional_reloc_count
;
12148 if (esdi
->rela
.hdr
)
12150 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12151 esdo
->rela
.count
+= additional_reloc_count
;
12157 esdo
->rela
.count
+= reloc_count
;
12159 esdo
->rel
.count
+= reloc_count
;
12163 if (o
->reloc_count
> 0)
12164 o
->flags
|= SEC_RELOC
;
12167 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12168 set it (this is probably a bug) and if it is set
12169 assign_section_numbers will create a reloc section. */
12170 o
->flags
&=~ SEC_RELOC
;
12173 /* If the SEC_ALLOC flag is not set, force the section VMA to
12174 zero. This is done in elf_fake_sections as well, but forcing
12175 the VMA to 0 here will ensure that relocs against these
12176 sections are handled correctly. */
12177 if ((o
->flags
& SEC_ALLOC
) == 0
12178 && ! o
->user_set_vma
)
12182 if (! bfd_link_relocatable (info
) && merged
)
12183 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12185 /* Figure out the file positions for everything but the symbol table
12186 and the relocs. We set symcount to force assign_section_numbers
12187 to create a symbol table. */
12188 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12189 BFD_ASSERT (! abfd
->output_has_begun
);
12190 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12193 /* Set sizes, and assign file positions for reloc sections. */
12194 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12196 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12197 if ((o
->flags
& SEC_RELOC
) != 0)
12200 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12204 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12208 /* _bfd_elf_compute_section_file_positions makes temporary use
12209 of target_index. Reset it. */
12210 o
->target_index
= 0;
12212 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12213 to count upwards while actually outputting the relocations. */
12214 esdo
->rel
.count
= 0;
12215 esdo
->rela
.count
= 0;
12217 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12218 && !bfd_section_is_ctf (o
))
12220 /* Cache the section contents so that they can be compressed
12221 later. Use bfd_malloc since it will be freed by
12222 bfd_compress_section_contents. */
12223 unsigned char *contents
= esdo
->this_hdr
.contents
;
12224 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12227 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12228 if (contents
== NULL
)
12230 esdo
->this_hdr
.contents
= contents
;
12234 /* We have now assigned file positions for all the sections except .symtab,
12235 .strtab, and non-loaded reloc and compressed debugging sections. We start
12236 the .symtab section at the current file position, and write directly to it.
12237 We build the .strtab section in memory. */
12238 abfd
->symcount
= 0;
12239 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12240 /* sh_name is set in prep_headers. */
12241 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12242 /* sh_flags, sh_addr and sh_size all start off zero. */
12243 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12244 /* sh_link is set in assign_section_numbers. */
12245 /* sh_info is set below. */
12246 /* sh_offset is set just below. */
12247 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12249 if (max_sym_count
< 20)
12250 max_sym_count
= 20;
12251 htab
->strtabsize
= max_sym_count
;
12252 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12253 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12254 if (htab
->strtab
== NULL
)
12256 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12258 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12259 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12261 if (info
->strip
!= strip_all
|| emit_relocs
)
12263 file_ptr off
= elf_next_file_pos (abfd
);
12265 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
12267 /* Note that at this point elf_next_file_pos (abfd) is
12268 incorrect. We do not yet know the size of the .symtab section.
12269 We correct next_file_pos below, after we do know the size. */
12271 /* Start writing out the symbol table. The first symbol is always a
12273 elfsym
.st_value
= 0;
12274 elfsym
.st_size
= 0;
12275 elfsym
.st_info
= 0;
12276 elfsym
.st_other
= 0;
12277 elfsym
.st_shndx
= SHN_UNDEF
;
12278 elfsym
.st_target_internal
= 0;
12279 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12280 bfd_und_section_ptr
, NULL
) != 1)
12283 /* Output a symbol for each section. We output these even if we are
12284 discarding local symbols, since they are used for relocs. These
12285 symbols have no names. We store the index of each one in the
12286 index field of the section, so that we can find it again when
12287 outputting relocs. */
12289 elfsym
.st_size
= 0;
12290 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12291 elfsym
.st_other
= 0;
12292 elfsym
.st_value
= 0;
12293 elfsym
.st_target_internal
= 0;
12294 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12296 o
= bfd_section_from_elf_index (abfd
, i
);
12299 o
->target_index
= bfd_get_symcount (abfd
);
12300 elfsym
.st_shndx
= i
;
12301 if (!bfd_link_relocatable (info
))
12302 elfsym
.st_value
= o
->vma
;
12303 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
, o
,
12310 /* Allocate some memory to hold information read in from the input
12312 if (max_contents_size
!= 0)
12314 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12315 if (flinfo
.contents
== NULL
)
12319 if (max_external_reloc_size
!= 0)
12321 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12322 if (flinfo
.external_relocs
== NULL
)
12326 if (max_internal_reloc_count
!= 0)
12328 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12329 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12330 if (flinfo
.internal_relocs
== NULL
)
12334 if (max_sym_count
!= 0)
12336 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12337 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12338 if (flinfo
.external_syms
== NULL
)
12341 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12342 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12343 if (flinfo
.internal_syms
== NULL
)
12346 amt
= max_sym_count
* sizeof (long);
12347 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12348 if (flinfo
.indices
== NULL
)
12351 amt
= max_sym_count
* sizeof (asection
*);
12352 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12353 if (flinfo
.sections
== NULL
)
12357 if (max_sym_shndx_count
!= 0)
12359 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12360 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12361 if (flinfo
.locsym_shndx
== NULL
)
12367 bfd_vma base
, end
= 0; /* Both bytes. */
12370 for (sec
= htab
->tls_sec
;
12371 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12374 bfd_size_type size
= sec
->size
;
12375 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12378 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12380 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12383 size
= ord
->offset
* opb
+ ord
->size
;
12385 end
= sec
->vma
+ size
/ opb
;
12387 base
= htab
->tls_sec
->vma
;
12388 /* Only align end of TLS section if static TLS doesn't have special
12389 alignment requirements. */
12390 if (bed
->static_tls_alignment
== 1)
12391 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12392 htab
->tls_size
= end
- base
;
12395 /* Reorder SHF_LINK_ORDER sections. */
12396 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12398 if (!elf_fixup_link_order (abfd
, o
))
12402 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12405 /* Since ELF permits relocations to be against local symbols, we
12406 must have the local symbols available when we do the relocations.
12407 Since we would rather only read the local symbols once, and we
12408 would rather not keep them in memory, we handle all the
12409 relocations for a single input file at the same time.
12411 Unfortunately, there is no way to know the total number of local
12412 symbols until we have seen all of them, and the local symbol
12413 indices precede the global symbol indices. This means that when
12414 we are generating relocatable output, and we see a reloc against
12415 a global symbol, we can not know the symbol index until we have
12416 finished examining all the local symbols to see which ones we are
12417 going to output. To deal with this, we keep the relocations in
12418 memory, and don't output them until the end of the link. This is
12419 an unfortunate waste of memory, but I don't see a good way around
12420 it. Fortunately, it only happens when performing a relocatable
12421 link, which is not the common case. FIXME: If keep_memory is set
12422 we could write the relocs out and then read them again; I don't
12423 know how bad the memory loss will be. */
12425 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12426 sub
->output_has_begun
= FALSE
;
12427 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12429 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12431 if (p
->type
== bfd_indirect_link_order
12432 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12433 == bfd_target_elf_flavour
)
12434 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12436 if (! sub
->output_has_begun
)
12438 if (! elf_link_input_bfd (&flinfo
, sub
))
12440 sub
->output_has_begun
= TRUE
;
12443 else if (p
->type
== bfd_section_reloc_link_order
12444 || p
->type
== bfd_symbol_reloc_link_order
)
12446 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12451 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12453 if (p
->type
== bfd_indirect_link_order
12454 && (bfd_get_flavour (sub
)
12455 == bfd_target_elf_flavour
)
12456 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12457 != bed
->s
->elfclass
))
12459 const char *iclass
, *oclass
;
12461 switch (bed
->s
->elfclass
)
12463 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12464 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12465 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12469 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12471 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12472 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12473 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12477 bfd_set_error (bfd_error_wrong_format
);
12479 /* xgettext:c-format */
12480 (_("%pB: file class %s incompatible with %s"),
12481 sub
, iclass
, oclass
);
12490 /* Free symbol buffer if needed. */
12491 if (!info
->reduce_memory_overheads
)
12493 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12494 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12496 free (elf_tdata (sub
)->symbuf
);
12497 elf_tdata (sub
)->symbuf
= NULL
;
12501 /* Output any global symbols that got converted to local in a
12502 version script or due to symbol visibility. We do this in a
12503 separate step since ELF requires all local symbols to appear
12504 prior to any global symbols. FIXME: We should only do this if
12505 some global symbols were, in fact, converted to become local.
12506 FIXME: Will this work correctly with the Irix 5 linker? */
12507 eoinfo
.failed
= FALSE
;
12508 eoinfo
.flinfo
= &flinfo
;
12509 eoinfo
.localsyms
= TRUE
;
12510 eoinfo
.file_sym_done
= FALSE
;
12511 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12515 /* If backend needs to output some local symbols not present in the hash
12516 table, do it now. */
12517 if (bed
->elf_backend_output_arch_local_syms
12518 && (info
->strip
!= strip_all
|| emit_relocs
))
12520 typedef int (*out_sym_func
)
12521 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12522 struct elf_link_hash_entry
*);
12524 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12525 (abfd
, info
, &flinfo
,
12526 (out_sym_func
) elf_link_output_symstrtab
)))
12530 /* That wrote out all the local symbols. Finish up the symbol table
12531 with the global symbols. Even if we want to strip everything we
12532 can, we still need to deal with those global symbols that got
12533 converted to local in a version script. */
12535 /* The sh_info field records the index of the first non local symbol. */
12536 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12539 && htab
->dynsym
!= NULL
12540 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12542 Elf_Internal_Sym sym
;
12543 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12545 o
= htab
->dynsym
->output_section
;
12546 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12548 /* Write out the section symbols for the output sections. */
12549 if (bfd_link_pic (info
)
12550 || htab
->is_relocatable_executable
)
12556 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12558 sym
.st_target_internal
= 0;
12560 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12566 dynindx
= elf_section_data (s
)->dynindx
;
12569 indx
= elf_section_data (s
)->this_idx
;
12570 BFD_ASSERT (indx
> 0);
12571 sym
.st_shndx
= indx
;
12572 if (! check_dynsym (abfd
, &sym
))
12574 sym
.st_value
= s
->vma
;
12575 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12576 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12580 /* Write out the local dynsyms. */
12581 if (htab
->dynlocal
)
12583 struct elf_link_local_dynamic_entry
*e
;
12584 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12589 /* Copy the internal symbol and turn off visibility.
12590 Note that we saved a word of storage and overwrote
12591 the original st_name with the dynstr_index. */
12593 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12595 s
= bfd_section_from_elf_index (e
->input_bfd
,
12600 elf_section_data (s
->output_section
)->this_idx
;
12601 if (! check_dynsym (abfd
, &sym
))
12603 sym
.st_value
= (s
->output_section
->vma
12605 + e
->isym
.st_value
);
12608 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12609 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12614 /* We get the global symbols from the hash table. */
12615 eoinfo
.failed
= FALSE
;
12616 eoinfo
.localsyms
= FALSE
;
12617 eoinfo
.flinfo
= &flinfo
;
12618 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12622 /* If backend needs to output some symbols not present in the hash
12623 table, do it now. */
12624 if (bed
->elf_backend_output_arch_syms
12625 && (info
->strip
!= strip_all
|| emit_relocs
))
12627 typedef int (*out_sym_func
)
12628 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12629 struct elf_link_hash_entry
*);
12631 if (! ((*bed
->elf_backend_output_arch_syms
)
12632 (abfd
, info
, &flinfo
,
12633 (out_sym_func
) elf_link_output_symstrtab
)))
12637 /* Finalize the .strtab section. */
12638 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12640 /* Swap out the .strtab section. */
12641 if (!elf_link_swap_symbols_out (&flinfo
))
12644 /* Now we know the size of the symtab section. */
12645 if (bfd_get_symcount (abfd
) > 0)
12647 /* Finish up and write out the symbol string table (.strtab)
12649 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12650 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12652 if (elf_symtab_shndx_list (abfd
))
12654 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12656 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12658 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12659 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12660 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12661 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12662 symtab_shndx_hdr
->sh_size
= amt
;
12664 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12667 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12668 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12673 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12674 /* sh_name was set in prep_headers. */
12675 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12676 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12677 symstrtab_hdr
->sh_addr
= 0;
12678 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12679 symstrtab_hdr
->sh_entsize
= 0;
12680 symstrtab_hdr
->sh_link
= 0;
12681 symstrtab_hdr
->sh_info
= 0;
12682 /* sh_offset is set just below. */
12683 symstrtab_hdr
->sh_addralign
= 1;
12685 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12687 elf_next_file_pos (abfd
) = off
;
12689 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12690 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12694 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12696 _bfd_error_handler (_("%pB: failed to generate import library"),
12697 info
->out_implib_bfd
);
12701 /* Adjust the relocs to have the correct symbol indices. */
12702 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12704 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12707 if ((o
->flags
& SEC_RELOC
) == 0)
12710 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12711 if (esdo
->rel
.hdr
!= NULL
12712 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12714 if (esdo
->rela
.hdr
!= NULL
12715 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12718 /* Set the reloc_count field to 0 to prevent write_relocs from
12719 trying to swap the relocs out itself. */
12720 o
->reloc_count
= 0;
12723 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12724 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12726 /* If we are linking against a dynamic object, or generating a
12727 shared library, finish up the dynamic linking information. */
12730 bfd_byte
*dyncon
, *dynconend
;
12732 /* Fix up .dynamic entries. */
12733 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12734 BFD_ASSERT (o
!= NULL
);
12736 dyncon
= o
->contents
;
12737 dynconend
= o
->contents
+ o
->size
;
12738 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12740 Elf_Internal_Dyn dyn
;
12743 bfd_size_type sh_size
;
12746 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12753 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12755 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12757 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12758 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12761 dyn
.d_un
.d_val
= relativecount
;
12768 name
= info
->init_function
;
12771 name
= info
->fini_function
;
12774 struct elf_link_hash_entry
*h
;
12776 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
12778 && (h
->root
.type
== bfd_link_hash_defined
12779 || h
->root
.type
== bfd_link_hash_defweak
))
12781 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12782 o
= h
->root
.u
.def
.section
;
12783 if (o
->output_section
!= NULL
)
12784 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12785 + o
->output_offset
);
12788 /* The symbol is imported from another shared
12789 library and does not apply to this one. */
12790 dyn
.d_un
.d_ptr
= 0;
12797 case DT_PREINIT_ARRAYSZ
:
12798 name
= ".preinit_array";
12800 case DT_INIT_ARRAYSZ
:
12801 name
= ".init_array";
12803 case DT_FINI_ARRAYSZ
:
12804 name
= ".fini_array";
12806 o
= bfd_get_section_by_name (abfd
, name
);
12810 (_("could not find section %s"), name
);
12815 (_("warning: %s section has zero size"), name
);
12816 dyn
.d_un
.d_val
= o
->size
;
12819 case DT_PREINIT_ARRAY
:
12820 name
= ".preinit_array";
12822 case DT_INIT_ARRAY
:
12823 name
= ".init_array";
12825 case DT_FINI_ARRAY
:
12826 name
= ".fini_array";
12828 o
= bfd_get_section_by_name (abfd
, name
);
12835 name
= ".gnu.hash";
12844 name
= ".gnu.version_d";
12847 name
= ".gnu.version_r";
12850 name
= ".gnu.version";
12852 o
= bfd_get_linker_section (dynobj
, name
);
12854 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
12857 (_("could not find section %s"), name
);
12860 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
12863 (_("warning: section '%s' is being made into a note"), name
);
12864 bfd_set_error (bfd_error_nonrepresentable_section
);
12867 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
12874 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
12880 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12882 Elf_Internal_Shdr
*hdr
;
12884 hdr
= elf_elfsections (abfd
)[i
];
12885 if (hdr
->sh_type
== type
12886 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
12888 sh_size
+= hdr
->sh_size
;
12890 || sh_addr
> hdr
->sh_addr
)
12891 sh_addr
= hdr
->sh_addr
;
12895 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
12897 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
12899 /* Don't count procedure linkage table relocs in the
12900 overall reloc count. */
12901 sh_size
-= htab
->srelplt
->size
;
12903 /* If the size is zero, make the address zero too.
12904 This is to avoid a glibc bug. If the backend
12905 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
12906 zero, then we'll put DT_RELA at the end of
12907 DT_JMPREL. glibc will interpret the end of
12908 DT_RELA matching the end of DT_JMPREL as the
12909 case where DT_RELA includes DT_JMPREL, and for
12910 LD_BIND_NOW will decide that processing DT_RELA
12911 will process the PLT relocs too. Net result:
12912 No PLT relocs applied. */
12915 /* If .rela.plt is the first .rela section, exclude
12916 it from DT_RELA. */
12917 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
12918 + htab
->srelplt
->output_offset
) * opb
)
12919 sh_addr
+= htab
->srelplt
->size
;
12922 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
12923 dyn
.d_un
.d_val
= sh_size
;
12925 dyn
.d_un
.d_ptr
= sh_addr
;
12928 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
12932 /* If we have created any dynamic sections, then output them. */
12933 if (dynobj
!= NULL
)
12935 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
12938 /* Check for DT_TEXTREL (late, in case the backend removes it). */
12939 if (bfd_link_textrel_check (info
)
12940 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
12942 bfd_byte
*dyncon
, *dynconend
;
12944 dyncon
= o
->contents
;
12945 dynconend
= o
->contents
+ o
->size
;
12946 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12948 Elf_Internal_Dyn dyn
;
12950 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12952 if (dyn
.d_tag
== DT_TEXTREL
)
12954 if (info
->textrel_check
== textrel_check_error
)
12955 info
->callbacks
->einfo
12956 (_("%P%X: read-only segment has dynamic relocations\n"));
12957 else if (bfd_link_dll (info
))
12958 info
->callbacks
->einfo
12959 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
12961 info
->callbacks
->einfo
12962 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
12968 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
12970 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
12972 || o
->output_section
== bfd_abs_section_ptr
)
12974 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
12976 /* At this point, we are only interested in sections
12977 created by _bfd_elf_link_create_dynamic_sections. */
12980 if (htab
->stab_info
.stabstr
== o
)
12982 if (htab
->eh_info
.hdr_sec
== o
)
12984 if (strcmp (o
->name
, ".dynstr") != 0)
12986 bfd_size_type octets
= ((file_ptr
) o
->output_offset
12987 * bfd_octets_per_byte (abfd
, o
));
12988 if (!bfd_set_section_contents (abfd
, o
->output_section
,
12989 o
->contents
, octets
, o
->size
))
12994 /* The contents of the .dynstr section are actually in a
12998 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
12999 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
13000 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13006 if (!info
->resolve_section_groups
)
13008 bfd_boolean failed
= FALSE
;
13010 BFD_ASSERT (bfd_link_relocatable (info
));
13011 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13016 /* If we have optimized stabs strings, output them. */
13017 if (htab
->stab_info
.stabstr
!= NULL
)
13019 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13023 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13026 if (info
->callbacks
->emit_ctf
)
13027 info
->callbacks
->emit_ctf ();
13029 elf_final_link_free (abfd
, &flinfo
);
13033 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13034 if (contents
== NULL
)
13035 return FALSE
; /* Bail out and fail. */
13036 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13037 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13044 elf_final_link_free (abfd
, &flinfo
);
13048 /* Initialize COOKIE for input bfd ABFD. */
13051 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13052 struct bfd_link_info
*info
, bfd
*abfd
)
13054 Elf_Internal_Shdr
*symtab_hdr
;
13055 const struct elf_backend_data
*bed
;
13057 bed
= get_elf_backend_data (abfd
);
13058 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13060 cookie
->abfd
= abfd
;
13061 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13062 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13063 if (cookie
->bad_symtab
)
13065 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13066 cookie
->extsymoff
= 0;
13070 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13071 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13074 if (bed
->s
->arch_size
== 32)
13075 cookie
->r_sym_shift
= 8;
13077 cookie
->r_sym_shift
= 32;
13079 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13080 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13082 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13083 cookie
->locsymcount
, 0,
13085 if (cookie
->locsyms
== NULL
)
13087 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13090 if (info
->keep_memory
)
13091 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13096 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13099 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13101 Elf_Internal_Shdr
*symtab_hdr
;
13103 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13104 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13105 free (cookie
->locsyms
);
13108 /* Initialize the relocation information in COOKIE for input section SEC
13109 of input bfd ABFD. */
13112 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13113 struct bfd_link_info
*info
, bfd
*abfd
,
13116 if (sec
->reloc_count
== 0)
13118 cookie
->rels
= NULL
;
13119 cookie
->relend
= NULL
;
13123 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13124 info
->keep_memory
);
13125 if (cookie
->rels
== NULL
)
13127 cookie
->rel
= cookie
->rels
;
13128 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13130 cookie
->rel
= cookie
->rels
;
13134 /* Free the memory allocated by init_reloc_cookie_rels,
13138 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13141 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13142 free (cookie
->rels
);
13145 /* Initialize the whole of COOKIE for input section SEC. */
13148 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13149 struct bfd_link_info
*info
,
13152 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13154 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13159 fini_reloc_cookie (cookie
, sec
->owner
);
13164 /* Free the memory allocated by init_reloc_cookie_for_section,
13168 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13171 fini_reloc_cookie_rels (cookie
, sec
);
13172 fini_reloc_cookie (cookie
, sec
->owner
);
13175 /* Garbage collect unused sections. */
13177 /* Default gc_mark_hook. */
13180 _bfd_elf_gc_mark_hook (asection
*sec
,
13181 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13182 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13183 struct elf_link_hash_entry
*h
,
13184 Elf_Internal_Sym
*sym
)
13188 switch (h
->root
.type
)
13190 case bfd_link_hash_defined
:
13191 case bfd_link_hash_defweak
:
13192 return h
->root
.u
.def
.section
;
13194 case bfd_link_hash_common
:
13195 return h
->root
.u
.c
.p
->section
;
13202 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13207 /* Return the debug definition section. */
13210 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13211 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13212 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13213 struct elf_link_hash_entry
*h
,
13214 Elf_Internal_Sym
*sym
)
13218 /* Return the global debug definition section. */
13219 if ((h
->root
.type
== bfd_link_hash_defined
13220 || h
->root
.type
== bfd_link_hash_defweak
)
13221 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13222 return h
->root
.u
.def
.section
;
13226 /* Return the local debug definition section. */
13227 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13229 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13236 /* COOKIE->rel describes a relocation against section SEC, which is
13237 a section we've decided to keep. Return the section that contains
13238 the relocation symbol, or NULL if no section contains it. */
13241 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13242 elf_gc_mark_hook_fn gc_mark_hook
,
13243 struct elf_reloc_cookie
*cookie
,
13244 bfd_boolean
*start_stop
)
13246 unsigned long r_symndx
;
13247 struct elf_link_hash_entry
*h
, *hw
;
13249 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13250 if (r_symndx
== STN_UNDEF
)
13253 if (r_symndx
>= cookie
->locsymcount
13254 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13256 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13259 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13263 while (h
->root
.type
== bfd_link_hash_indirect
13264 || h
->root
.type
== bfd_link_hash_warning
)
13265 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13267 /* Keep all aliases of the symbol too. If an object symbol
13268 needs to be copied into .dynbss then all of its aliases
13269 should be present as dynamic symbols, not just the one used
13270 on the copy relocation. */
13272 while (hw
->is_weakalias
)
13278 if (start_stop
!= NULL
)
13280 /* To work around a glibc bug, mark XXX input sections
13281 when there is a reference to __start_XXX or __stop_XXX
13285 asection
*s
= h
->u2
.start_stop_section
;
13286 *start_stop
= !s
->gc_mark
;
13291 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13294 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13295 &cookie
->locsyms
[r_symndx
]);
13298 /* COOKIE->rel describes a relocation against section SEC, which is
13299 a section we've decided to keep. Mark the section that contains
13300 the relocation symbol. */
13303 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13305 elf_gc_mark_hook_fn gc_mark_hook
,
13306 struct elf_reloc_cookie
*cookie
)
13309 bfd_boolean start_stop
= FALSE
;
13311 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13312 while (rsec
!= NULL
)
13314 if (!rsec
->gc_mark
)
13316 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13317 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13319 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13324 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13329 /* The mark phase of garbage collection. For a given section, mark
13330 it and any sections in this section's group, and all the sections
13331 which define symbols to which it refers. */
13334 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13336 elf_gc_mark_hook_fn gc_mark_hook
)
13339 asection
*group_sec
, *eh_frame
;
13343 /* Mark all the sections in the group. */
13344 group_sec
= elf_section_data (sec
)->next_in_group
;
13345 if (group_sec
&& !group_sec
->gc_mark
)
13346 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13349 /* Look through the section relocs. */
13351 eh_frame
= elf_eh_frame_section (sec
->owner
);
13352 if ((sec
->flags
& SEC_RELOC
) != 0
13353 && sec
->reloc_count
> 0
13354 && sec
!= eh_frame
)
13356 struct elf_reloc_cookie cookie
;
13358 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13362 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13363 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13368 fini_reloc_cookie_for_section (&cookie
, sec
);
13372 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13374 struct elf_reloc_cookie cookie
;
13376 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13380 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13381 gc_mark_hook
, &cookie
))
13383 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13387 eh_frame
= elf_section_eh_frame_entry (sec
);
13388 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13389 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13395 /* Scan and mark sections in a special or debug section group. */
13398 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13400 /* Point to first section of section group. */
13402 /* Used to iterate the section group. */
13405 bfd_boolean is_special_grp
= TRUE
;
13406 bfd_boolean is_debug_grp
= TRUE
;
13408 /* First scan to see if group contains any section other than debug
13409 and special section. */
13410 ssec
= msec
= elf_next_in_group (grp
);
13413 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13414 is_debug_grp
= FALSE
;
13416 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13417 is_special_grp
= FALSE
;
13419 msec
= elf_next_in_group (msec
);
13421 while (msec
!= ssec
);
13423 /* If this is a pure debug section group or pure special section group,
13424 keep all sections in this group. */
13425 if (is_debug_grp
|| is_special_grp
)
13430 msec
= elf_next_in_group (msec
);
13432 while (msec
!= ssec
);
13436 /* Keep debug and special sections. */
13439 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13440 elf_gc_mark_hook_fn mark_hook
)
13444 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13447 bfd_boolean some_kept
;
13448 bfd_boolean debug_frag_seen
;
13449 bfd_boolean has_kept_debug_info
;
13451 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13453 isec
= ibfd
->sections
;
13454 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13457 /* Ensure all linker created sections are kept,
13458 see if any other section is already marked,
13459 and note if we have any fragmented debug sections. */
13460 debug_frag_seen
= some_kept
= has_kept_debug_info
= FALSE
;
13461 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13463 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13465 else if (isec
->gc_mark
13466 && (isec
->flags
& SEC_ALLOC
) != 0
13467 && elf_section_type (isec
) != SHT_NOTE
)
13471 /* Since all sections, except for backend specific ones,
13472 have been garbage collected, call mark_hook on this
13473 section if any of its linked-to sections is marked. */
13474 asection
*linked_to_sec
= elf_linked_to_section (isec
);
13475 for (; linked_to_sec
!= NULL
;
13476 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13477 if (linked_to_sec
->gc_mark
)
13479 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13485 if (!debug_frag_seen
13486 && (isec
->flags
& SEC_DEBUGGING
)
13487 && CONST_STRNEQ (isec
->name
, ".debug_line."))
13488 debug_frag_seen
= TRUE
;
13489 else if (strcmp (bfd_section_name (isec
),
13490 "__patchable_function_entries") == 0
13491 && elf_linked_to_section (isec
) == NULL
)
13492 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13493 "need linked-to section "
13494 "for --gc-sections\n"),
13495 isec
->owner
, isec
);
13498 /* If no non-note alloc section in this file will be kept, then
13499 we can toss out the debug and special sections. */
13503 /* Keep debug and special sections like .comment when they are
13504 not part of a group. Also keep section groups that contain
13505 just debug sections or special sections. NB: Sections with
13506 linked-to section has been handled above. */
13507 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13509 if ((isec
->flags
& SEC_GROUP
) != 0)
13510 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13511 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13512 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13513 && elf_next_in_group (isec
) == NULL
13514 && elf_linked_to_section (isec
) == NULL
)
13516 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13517 has_kept_debug_info
= TRUE
;
13520 /* Look for CODE sections which are going to be discarded,
13521 and find and discard any fragmented debug sections which
13522 are associated with that code section. */
13523 if (debug_frag_seen
)
13524 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13525 if ((isec
->flags
& SEC_CODE
) != 0
13526 && isec
->gc_mark
== 0)
13531 ilen
= strlen (isec
->name
);
13533 /* Association is determined by the name of the debug
13534 section containing the name of the code section as
13535 a suffix. For example .debug_line.text.foo is a
13536 debug section associated with .text.foo. */
13537 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13541 if (dsec
->gc_mark
== 0
13542 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13545 dlen
= strlen (dsec
->name
);
13548 && strncmp (dsec
->name
+ (dlen
- ilen
),
13549 isec
->name
, ilen
) == 0)
13554 /* Mark debug sections referenced by kept debug sections. */
13555 if (has_kept_debug_info
)
13556 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13558 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13559 if (!_bfd_elf_gc_mark (info
, isec
,
13560 elf_gc_mark_debug_section
))
13567 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13570 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13572 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13576 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13577 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13578 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13581 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13584 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13586 /* When any section in a section group is kept, we keep all
13587 sections in the section group. If the first member of
13588 the section group is excluded, we will also exclude the
13590 if (o
->flags
& SEC_GROUP
)
13592 asection
*first
= elf_next_in_group (o
);
13593 o
->gc_mark
= first
->gc_mark
;
13599 /* Skip sweeping sections already excluded. */
13600 if (o
->flags
& SEC_EXCLUDE
)
13603 /* Since this is early in the link process, it is simple
13604 to remove a section from the output. */
13605 o
->flags
|= SEC_EXCLUDE
;
13607 if (info
->print_gc_sections
&& o
->size
!= 0)
13608 /* xgettext:c-format */
13609 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13617 /* Propagate collected vtable information. This is called through
13618 elf_link_hash_traverse. */
13621 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13623 /* Those that are not vtables. */
13625 || h
->u2
.vtable
== NULL
13626 || h
->u2
.vtable
->parent
== NULL
)
13629 /* Those vtables that do not have parents, we cannot merge. */
13630 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13633 /* If we've already been done, exit. */
13634 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13637 /* Make sure the parent's table is up to date. */
13638 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13640 if (h
->u2
.vtable
->used
== NULL
)
13642 /* None of this table's entries were referenced. Re-use the
13644 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13645 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13650 bfd_boolean
*cu
, *pu
;
13652 /* Or the parent's entries into ours. */
13653 cu
= h
->u2
.vtable
->used
;
13655 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13658 const struct elf_backend_data
*bed
;
13659 unsigned int log_file_align
;
13661 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13662 log_file_align
= bed
->s
->log_file_align
;
13663 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13678 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13681 bfd_vma hstart
, hend
;
13682 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13683 const struct elf_backend_data
*bed
;
13684 unsigned int log_file_align
;
13686 /* Take care of both those symbols that do not describe vtables as
13687 well as those that are not loaded. */
13689 || h
->u2
.vtable
== NULL
13690 || h
->u2
.vtable
->parent
== NULL
)
13693 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13694 || h
->root
.type
== bfd_link_hash_defweak
);
13696 sec
= h
->root
.u
.def
.section
;
13697 hstart
= h
->root
.u
.def
.value
;
13698 hend
= hstart
+ h
->size
;
13700 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
13702 return *(bfd_boolean
*) okp
= FALSE
;
13703 bed
= get_elf_backend_data (sec
->owner
);
13704 log_file_align
= bed
->s
->log_file_align
;
13706 relend
= relstart
+ sec
->reloc_count
;
13708 for (rel
= relstart
; rel
< relend
; ++rel
)
13709 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13711 /* If the entry is in use, do nothing. */
13712 if (h
->u2
.vtable
->used
13713 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13715 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13716 if (h
->u2
.vtable
->used
[entry
])
13719 /* Otherwise, kill it. */
13720 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13726 /* Mark sections containing dynamically referenced symbols. When
13727 building shared libraries, we must assume that any visible symbol is
13731 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13733 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13734 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13736 if ((h
->root
.type
== bfd_link_hash_defined
13737 || h
->root
.type
== bfd_link_hash_defweak
)
13738 && ((h
->ref_dynamic
&& !h
->forced_local
)
13739 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13740 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13741 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13742 && (!bfd_link_executable (info
)
13743 || info
->gc_keep_exported
13744 || info
->export_dynamic
13747 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13748 && (h
->versioned
>= versioned
13749 || !bfd_hide_sym_by_version (info
->version_info
,
13750 h
->root
.root
.string
)))))
13751 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13756 /* Keep all sections containing symbols undefined on the command-line,
13757 and the section containing the entry symbol. */
13760 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13762 struct bfd_sym_chain
*sym
;
13764 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13766 struct elf_link_hash_entry
*h
;
13768 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13769 FALSE
, FALSE
, FALSE
);
13772 && (h
->root
.type
== bfd_link_hash_defined
13773 || h
->root
.type
== bfd_link_hash_defweak
)
13774 && !bfd_is_abs_section (h
->root
.u
.def
.section
)
13775 && !bfd_is_und_section (h
->root
.u
.def
.section
))
13776 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13781 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13782 struct bfd_link_info
*info
)
13784 bfd
*ibfd
= info
->input_bfds
;
13786 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13789 struct elf_reloc_cookie cookie
;
13791 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13793 sec
= ibfd
->sections
;
13794 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13797 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
13800 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
13802 if (CONST_STRNEQ (bfd_section_name (sec
), ".eh_frame_entry")
13803 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
13805 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
13806 fini_reloc_cookie_rels (&cookie
, sec
);
13813 /* Do mark and sweep of unused sections. */
13816 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
13818 bfd_boolean ok
= TRUE
;
13820 elf_gc_mark_hook_fn gc_mark_hook
;
13821 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13822 struct elf_link_hash_table
*htab
;
13824 if (!bed
->can_gc_sections
13825 || !is_elf_hash_table (info
->hash
))
13827 _bfd_error_handler(_("warning: gc-sections option ignored"));
13831 bed
->gc_keep (info
);
13832 htab
= elf_hash_table (info
);
13834 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
13835 at the .eh_frame section if we can mark the FDEs individually. */
13836 for (sub
= info
->input_bfds
;
13837 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
13838 sub
= sub
->link
.next
)
13841 struct elf_reloc_cookie cookie
;
13843 sec
= sub
->sections
;
13844 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13846 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
13847 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
13849 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
13850 if (elf_section_data (sec
)->sec_info
13851 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
13852 elf_eh_frame_section (sub
) = sec
;
13853 fini_reloc_cookie_for_section (&cookie
, sec
);
13854 sec
= bfd_get_next_section_by_name (NULL
, sec
);
13858 /* Apply transitive closure to the vtable entry usage info. */
13859 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
13863 /* Kill the vtable relocations that were not used. */
13864 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
13868 /* Mark dynamically referenced symbols. */
13869 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
13870 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
13872 /* Grovel through relocs to find out who stays ... */
13873 gc_mark_hook
= bed
->gc_mark_hook
;
13874 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13878 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13879 || elf_object_id (sub
) != elf_hash_table_id (htab
)
13880 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13884 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13887 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
13888 Also treat note sections as a root, if the section is not part
13889 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
13890 well as FINI_ARRAY sections for ld -r. */
13891 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13893 && (o
->flags
& SEC_EXCLUDE
) == 0
13894 && ((o
->flags
& SEC_KEEP
) != 0
13895 || (bfd_link_relocatable (info
)
13896 && ((elf_section_data (o
)->this_hdr
.sh_type
13897 == SHT_PREINIT_ARRAY
)
13898 || (elf_section_data (o
)->this_hdr
.sh_type
13900 || (elf_section_data (o
)->this_hdr
.sh_type
13901 == SHT_FINI_ARRAY
)))
13902 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
13903 && elf_next_in_group (o
) == NULL
)))
13905 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
13910 /* Allow the backend to mark additional target specific sections. */
13911 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
13913 /* ... and mark SEC_EXCLUDE for those that go. */
13914 return elf_gc_sweep (abfd
, info
);
13917 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
13920 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
13922 struct elf_link_hash_entry
*h
,
13925 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
13926 struct elf_link_hash_entry
**search
, *child
;
13927 size_t extsymcount
;
13928 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13930 /* The sh_info field of the symtab header tells us where the
13931 external symbols start. We don't care about the local symbols at
13933 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
13934 if (!elf_bad_symtab (abfd
))
13935 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
13937 sym_hashes
= elf_sym_hashes (abfd
);
13938 sym_hashes_end
= sym_hashes
+ extsymcount
;
13940 /* Hunt down the child symbol, which is in this section at the same
13941 offset as the relocation. */
13942 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
13944 if ((child
= *search
) != NULL
13945 && (child
->root
.type
== bfd_link_hash_defined
13946 || child
->root
.type
== bfd_link_hash_defweak
)
13947 && child
->root
.u
.def
.section
== sec
13948 && child
->root
.u
.def
.value
== offset
)
13952 /* xgettext:c-format */
13953 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
13954 abfd
, sec
, (uint64_t) offset
);
13955 bfd_set_error (bfd_error_invalid_operation
);
13959 if (!child
->u2
.vtable
)
13961 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
13962 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
13963 if (!child
->u2
.vtable
)
13968 /* This *should* only be the absolute section. It could potentially
13969 be that someone has defined a non-global vtable though, which
13970 would be bad. It isn't worth paging in the local symbols to be
13971 sure though; that case should simply be handled by the assembler. */
13973 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
13976 child
->u2
.vtable
->parent
= h
;
13981 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13984 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
13985 struct elf_link_hash_entry
*h
,
13988 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13989 unsigned int log_file_align
= bed
->s
->log_file_align
;
13993 /* xgettext:c-format */
13994 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
13996 bfd_set_error (bfd_error_bad_value
);
14002 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14003 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14008 if (addend
>= h
->u2
.vtable
->size
)
14010 size_t size
, bytes
, file_align
;
14011 bfd_boolean
*ptr
= h
->u2
.vtable
->used
;
14013 /* While the symbol is undefined, we have to be prepared to handle
14015 file_align
= 1 << log_file_align
;
14016 if (h
->root
.type
== bfd_link_hash_undefined
)
14017 size
= addend
+ file_align
;
14021 if (addend
>= size
)
14023 /* Oops! We've got a reference past the defined end of
14024 the table. This is probably a bug -- shall we warn? */
14025 size
= addend
+ file_align
;
14028 size
= (size
+ file_align
- 1) & -file_align
;
14030 /* Allocate one extra entry for use as a "done" flag for the
14031 consolidation pass. */
14032 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
14036 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
14042 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14043 * sizeof (bfd_boolean
));
14044 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14048 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
14053 /* And arrange for that done flag to be at index -1. */
14054 h
->u2
.vtable
->used
= ptr
+ 1;
14055 h
->u2
.vtable
->size
= size
;
14058 h
->u2
.vtable
->used
[addend
>> log_file_align
] = TRUE
;
14063 /* Map an ELF section header flag to its corresponding string. */
14067 flagword flag_value
;
14068 } elf_flags_to_name_table
;
14070 static elf_flags_to_name_table elf_flags_to_names
[] =
14072 { "SHF_WRITE", SHF_WRITE
},
14073 { "SHF_ALLOC", SHF_ALLOC
},
14074 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14075 { "SHF_MERGE", SHF_MERGE
},
14076 { "SHF_STRINGS", SHF_STRINGS
},
14077 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14078 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14079 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14080 { "SHF_GROUP", SHF_GROUP
},
14081 { "SHF_TLS", SHF_TLS
},
14082 { "SHF_MASKOS", SHF_MASKOS
},
14083 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14086 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14088 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14089 struct flag_info
*flaginfo
,
14092 const bfd_vma sh_flags
= elf_section_flags (section
);
14094 if (!flaginfo
->flags_initialized
)
14096 bfd
*obfd
= info
->output_bfd
;
14097 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14098 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14100 int without_hex
= 0;
14102 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14105 flagword (*lookup
) (char *);
14107 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14108 if (lookup
!= NULL
)
14110 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14114 if (tf
->with
== with_flags
)
14115 with_hex
|= hexval
;
14116 else if (tf
->with
== without_flags
)
14117 without_hex
|= hexval
;
14122 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14124 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14126 if (tf
->with
== with_flags
)
14127 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14128 else if (tf
->with
== without_flags
)
14129 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14136 info
->callbacks
->einfo
14137 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14141 flaginfo
->flags_initialized
= TRUE
;
14142 flaginfo
->only_with_flags
|= with_hex
;
14143 flaginfo
->not_with_flags
|= without_hex
;
14146 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14149 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14155 struct alloc_got_off_arg
{
14157 struct bfd_link_info
*info
;
14160 /* We need a special top-level link routine to convert got reference counts
14161 to real got offsets. */
14164 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14166 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14167 bfd
*obfd
= gofarg
->info
->output_bfd
;
14168 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14170 if (h
->got
.refcount
> 0)
14172 h
->got
.offset
= gofarg
->gotoff
;
14173 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14176 h
->got
.offset
= (bfd_vma
) -1;
14181 /* And an accompanying bit to work out final got entry offsets once
14182 we're done. Should be called from final_link. */
14185 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14186 struct bfd_link_info
*info
)
14189 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14191 struct alloc_got_off_arg gofarg
;
14193 BFD_ASSERT (abfd
== info
->output_bfd
);
14195 if (! is_elf_hash_table (info
->hash
))
14198 /* The GOT offset is relative to the .got section, but the GOT header is
14199 put into the .got.plt section, if the backend uses it. */
14200 if (bed
->want_got_plt
)
14203 gotoff
= bed
->got_header_size
;
14205 /* Do the local .got entries first. */
14206 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14208 bfd_signed_vma
*local_got
;
14209 size_t j
, locsymcount
;
14210 Elf_Internal_Shdr
*symtab_hdr
;
14212 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14215 local_got
= elf_local_got_refcounts (i
);
14219 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14220 if (elf_bad_symtab (i
))
14221 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14223 locsymcount
= symtab_hdr
->sh_info
;
14225 for (j
= 0; j
< locsymcount
; ++j
)
14227 if (local_got
[j
] > 0)
14229 local_got
[j
] = gotoff
;
14230 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14233 local_got
[j
] = (bfd_vma
) -1;
14237 /* Then the global .got entries. .plt refcounts are handled by
14238 adjust_dynamic_symbol */
14239 gofarg
.gotoff
= gotoff
;
14240 gofarg
.info
= info
;
14241 elf_link_hash_traverse (elf_hash_table (info
),
14242 elf_gc_allocate_got_offsets
,
14247 /* Many folk need no more in the way of final link than this, once
14248 got entry reference counting is enabled. */
14251 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14253 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14256 /* Invoke the regular ELF backend linker to do all the work. */
14257 return bfd_elf_final_link (abfd
, info
);
14261 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14263 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14265 if (rcookie
->bad_symtab
)
14266 rcookie
->rel
= rcookie
->rels
;
14268 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14270 unsigned long r_symndx
;
14272 if (! rcookie
->bad_symtab
)
14273 if (rcookie
->rel
->r_offset
> offset
)
14275 if (rcookie
->rel
->r_offset
!= offset
)
14278 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14279 if (r_symndx
== STN_UNDEF
)
14282 if (r_symndx
>= rcookie
->locsymcount
14283 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14285 struct elf_link_hash_entry
*h
;
14287 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14289 while (h
->root
.type
== bfd_link_hash_indirect
14290 || h
->root
.type
== bfd_link_hash_warning
)
14291 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14293 if ((h
->root
.type
== bfd_link_hash_defined
14294 || h
->root
.type
== bfd_link_hash_defweak
)
14295 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14296 || h
->root
.u
.def
.section
->kept_section
!= NULL
14297 || discarded_section (h
->root
.u
.def
.section
)))
14302 /* It's not a relocation against a global symbol,
14303 but it could be a relocation against a local
14304 symbol for a discarded section. */
14306 Elf_Internal_Sym
*isym
;
14308 /* Need to: get the symbol; get the section. */
14309 isym
= &rcookie
->locsyms
[r_symndx
];
14310 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14312 && (isec
->kept_section
!= NULL
14313 || discarded_section (isec
)))
14321 /* Discard unneeded references to discarded sections.
14322 Returns -1 on error, 1 if any section's size was changed, 0 if
14323 nothing changed. This function assumes that the relocations are in
14324 sorted order, which is true for all known assemblers. */
14327 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14329 struct elf_reloc_cookie cookie
;
14334 if (info
->traditional_format
14335 || !is_elf_hash_table (info
->hash
))
14338 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14343 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14346 || i
->reloc_count
== 0
14347 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14351 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14354 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14357 if (_bfd_discard_section_stabs (abfd
, i
,
14358 elf_section_data (i
)->sec_info
,
14359 bfd_elf_reloc_symbol_deleted_p
,
14363 fini_reloc_cookie_for_section (&cookie
, i
);
14368 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14369 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14373 int eh_changed
= 0;
14374 unsigned int eh_alignment
; /* Octets. */
14376 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14382 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14385 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14388 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14389 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14390 bfd_elf_reloc_symbol_deleted_p
,
14394 if (i
->size
!= i
->rawsize
)
14398 fini_reloc_cookie_for_section (&cookie
, i
);
14401 eh_alignment
= ((1 << o
->alignment_power
)
14402 * bfd_octets_per_byte (output_bfd
, o
));
14403 /* Skip over zero terminator, and prevent empty sections from
14404 adding alignment padding at the end. */
14405 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14407 i
->flags
|= SEC_EXCLUDE
;
14408 else if (i
->size
> 4)
14410 /* The last non-empty eh_frame section doesn't need padding. */
14413 /* Any prior sections must pad the last FDE out to the output
14414 section alignment. Otherwise we might have zero padding
14415 between sections, which would be seen as a terminator. */
14416 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14418 /* All but the last zero terminator should have been removed. */
14423 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14424 if (i
->size
!= size
)
14432 elf_link_hash_traverse (elf_hash_table (info
),
14433 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14436 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14438 const struct elf_backend_data
*bed
;
14441 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14443 s
= abfd
->sections
;
14444 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14447 bed
= get_elf_backend_data (abfd
);
14449 if (bed
->elf_backend_discard_info
!= NULL
)
14451 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14454 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14457 fini_reloc_cookie (&cookie
, abfd
);
14461 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14462 _bfd_elf_end_eh_frame_parsing (info
);
14464 if (info
->eh_frame_hdr_type
14465 && !bfd_link_relocatable (info
)
14466 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14473 _bfd_elf_section_already_linked (bfd
*abfd
,
14475 struct bfd_link_info
*info
)
14478 const char *name
, *key
;
14479 struct bfd_section_already_linked
*l
;
14480 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14482 if (sec
->output_section
== bfd_abs_section_ptr
)
14485 flags
= sec
->flags
;
14487 /* Return if it isn't a linkonce section. A comdat group section
14488 also has SEC_LINK_ONCE set. */
14489 if ((flags
& SEC_LINK_ONCE
) == 0)
14492 /* Don't put group member sections on our list of already linked
14493 sections. They are handled as a group via their group section. */
14494 if (elf_sec_group (sec
) != NULL
)
14497 /* For a SHT_GROUP section, use the group signature as the key. */
14499 if ((flags
& SEC_GROUP
) != 0
14500 && elf_next_in_group (sec
) != NULL
14501 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14502 key
= elf_group_name (elf_next_in_group (sec
));
14505 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14506 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
14507 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14510 /* Must be a user linkonce section that doesn't follow gcc's
14511 naming convention. In this case we won't be matching
14512 single member groups. */
14516 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14518 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14520 /* We may have 2 different types of sections on the list: group
14521 sections with a signature of <key> (<key> is some string),
14522 and linkonce sections named .gnu.linkonce.<type>.<key>.
14523 Match like sections. LTO plugin sections are an exception.
14524 They are always named .gnu.linkonce.t.<key> and match either
14525 type of section. */
14526 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14527 && ((flags
& SEC_GROUP
) != 0
14528 || strcmp (name
, l
->sec
->name
) == 0))
14529 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14531 /* The section has already been linked. See if we should
14532 issue a warning. */
14533 if (!_bfd_handle_already_linked (sec
, l
, info
))
14536 if (flags
& SEC_GROUP
)
14538 asection
*first
= elf_next_in_group (sec
);
14539 asection
*s
= first
;
14543 s
->output_section
= bfd_abs_section_ptr
;
14544 /* Record which group discards it. */
14545 s
->kept_section
= l
->sec
;
14546 s
= elf_next_in_group (s
);
14547 /* These lists are circular. */
14557 /* A single member comdat group section may be discarded by a
14558 linkonce section and vice versa. */
14559 if ((flags
& SEC_GROUP
) != 0)
14561 asection
*first
= elf_next_in_group (sec
);
14563 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14564 /* Check this single member group against linkonce sections. */
14565 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14566 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14567 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14569 first
->output_section
= bfd_abs_section_ptr
;
14570 first
->kept_section
= l
->sec
;
14571 sec
->output_section
= bfd_abs_section_ptr
;
14576 /* Check this linkonce section against single member groups. */
14577 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14578 if (l
->sec
->flags
& SEC_GROUP
)
14580 asection
*first
= elf_next_in_group (l
->sec
);
14583 && elf_next_in_group (first
) == first
14584 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14586 sec
->output_section
= bfd_abs_section_ptr
;
14587 sec
->kept_section
= first
;
14592 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14593 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14594 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14595 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14596 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14597 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14598 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14599 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14600 The reverse order cannot happen as there is never a bfd with only the
14601 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14602 matter as here were are looking only for cross-bfd sections. */
14604 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
14605 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14606 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14607 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
14609 if (abfd
!= l
->sec
->owner
)
14610 sec
->output_section
= bfd_abs_section_ptr
;
14614 /* This is the first section with this name. Record it. */
14615 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14616 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14617 return sec
->output_section
== bfd_abs_section_ptr
;
14621 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14623 return sym
->st_shndx
== SHN_COMMON
;
14627 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14633 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14635 return bfd_com_section_ptr
;
14639 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14640 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14641 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14642 bfd
*ibfd ATTRIBUTE_UNUSED
,
14643 unsigned long symndx ATTRIBUTE_UNUSED
)
14645 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14646 return bed
->s
->arch_size
/ 8;
14649 /* Routines to support the creation of dynamic relocs. */
14651 /* Returns the name of the dynamic reloc section associated with SEC. */
14653 static const char *
14654 get_dynamic_reloc_section_name (bfd
* abfd
,
14656 bfd_boolean is_rela
)
14659 const char *old_name
= bfd_section_name (sec
);
14660 const char *prefix
= is_rela
? ".rela" : ".rel";
14662 if (old_name
== NULL
)
14665 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14666 sprintf (name
, "%s%s", prefix
, old_name
);
14671 /* Returns the dynamic reloc section associated with SEC.
14672 If necessary compute the name of the dynamic reloc section based
14673 on SEC's name (looked up in ABFD's string table) and the setting
14677 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
14679 bfd_boolean is_rela
)
14681 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14683 if (reloc_sec
== NULL
)
14685 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14689 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14691 if (reloc_sec
!= NULL
)
14692 elf_section_data (sec
)->sreloc
= reloc_sec
;
14699 /* Returns the dynamic reloc section associated with SEC. If the
14700 section does not exist it is created and attached to the DYNOBJ
14701 bfd and stored in the SRELOC field of SEC's elf_section_data
14704 ALIGNMENT is the alignment for the newly created section and
14705 IS_RELA defines whether the name should be .rela.<SEC's name>
14706 or .rel.<SEC's name>. The section name is looked up in the
14707 string table associated with ABFD. */
14710 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14712 unsigned int alignment
,
14714 bfd_boolean is_rela
)
14716 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14718 if (reloc_sec
== NULL
)
14720 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14725 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14727 if (reloc_sec
== NULL
)
14729 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14730 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14731 if ((sec
->flags
& SEC_ALLOC
) != 0)
14732 flags
|= SEC_ALLOC
| SEC_LOAD
;
14734 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14735 if (reloc_sec
!= NULL
)
14737 /* _bfd_elf_get_sec_type_attr chooses a section type by
14738 name. Override as it may be wrong, eg. for a user
14739 section named "auto" we'll get ".relauto" which is
14740 seen to be a .rela section. */
14741 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14742 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14747 elf_section_data (sec
)->sreloc
= reloc_sec
;
14753 /* Copy the ELF symbol type and other attributes for a linker script
14754 assignment from HSRC to HDEST. Generally this should be treated as
14755 if we found a strong non-dynamic definition for HDEST (except that
14756 ld ignores multiple definition errors). */
14758 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14759 struct bfd_link_hash_entry
*hdest
,
14760 struct bfd_link_hash_entry
*hsrc
)
14762 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14763 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14764 Elf_Internal_Sym isym
;
14766 ehdest
->type
= ehsrc
->type
;
14767 ehdest
->target_internal
= ehsrc
->target_internal
;
14769 isym
.st_other
= ehsrc
->other
;
14770 elf_merge_st_other (abfd
, ehdest
, &isym
, NULL
, TRUE
, FALSE
);
14773 /* Append a RELA relocation REL to section S in BFD. */
14776 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14778 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14779 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14780 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14781 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14784 /* Append a REL relocation REL to section S in BFD. */
14787 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14789 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14790 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14791 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
14792 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
14795 /* Define __start, __stop, .startof. or .sizeof. symbol. */
14797 struct bfd_link_hash_entry
*
14798 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
14799 const char *symbol
, asection
*sec
)
14801 struct elf_link_hash_entry
*h
;
14803 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
14804 FALSE
, FALSE
, TRUE
);
14806 && (h
->root
.type
== bfd_link_hash_undefined
14807 || h
->root
.type
== bfd_link_hash_undefweak
14808 || ((h
->ref_regular
|| h
->def_dynamic
) && !h
->def_regular
)))
14810 bfd_boolean was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
14811 h
->root
.type
= bfd_link_hash_defined
;
14812 h
->root
.u
.def
.section
= sec
;
14813 h
->root
.u
.def
.value
= 0;
14814 h
->def_regular
= 1;
14815 h
->def_dynamic
= 0;
14817 h
->u2
.start_stop_section
= sec
;
14818 if (symbol
[0] == '.')
14820 /* .startof. and .sizeof. symbols are local. */
14821 const struct elf_backend_data
*bed
;
14822 bed
= get_elf_backend_data (info
->output_bfd
);
14823 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
14827 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
14828 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_PROTECTED
;
14830 bfd_elf_link_record_dynamic_symbol (info
, h
);
14837 /* Find dynamic relocs for H that apply to read-only sections. */
14840 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
14842 struct elf_dyn_relocs
*p
;
14844 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
14846 asection
*s
= p
->sec
->output_section
;
14848 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
14854 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
14855 read-only sections. */
14858 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
14862 if (h
->root
.type
== bfd_link_hash_indirect
)
14865 sec
= _bfd_elf_readonly_dynrelocs (h
);
14868 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
14870 info
->flags
|= DF_TEXTREL
;
14871 /* xgettext:c-format */
14872 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
14873 "in read-only section `%pA'\n"),
14874 sec
->owner
, h
->root
.root
.string
, sec
);
14876 if (bfd_link_textrel_check (info
))
14877 /* xgettext:c-format */
14878 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
14879 "in read-only section `%pA'\n"),
14880 sec
->owner
, h
->root
.root
.string
, sec
);
14882 /* Not an error, just cut short the traversal. */