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
;
2649 /* Don't free alloc2, since if it was allocated we are passing it
2650 back (under the name of internal_relocs). */
2652 return internal_relocs
;
2660 bfd_release (abfd
, alloc2
);
2667 /* Compute the size of, and allocate space for, REL_HDR which is the
2668 section header for a section containing relocations for O. */
2671 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2672 struct bfd_elf_section_reloc_data
*reldata
)
2674 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2676 /* That allows us to calculate the size of the section. */
2677 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2679 /* The contents field must last into write_object_contents, so we
2680 allocate it with bfd_alloc rather than malloc. Also since we
2681 cannot be sure that the contents will actually be filled in,
2682 we zero the allocated space. */
2683 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2684 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2687 if (reldata
->hashes
== NULL
&& reldata
->count
)
2689 struct elf_link_hash_entry
**p
;
2691 p
= ((struct elf_link_hash_entry
**)
2692 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2696 reldata
->hashes
= p
;
2702 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2703 originated from the section given by INPUT_REL_HDR) to the
2707 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2708 asection
*input_section
,
2709 Elf_Internal_Shdr
*input_rel_hdr
,
2710 Elf_Internal_Rela
*internal_relocs
,
2711 struct elf_link_hash_entry
**rel_hash
2714 Elf_Internal_Rela
*irela
;
2715 Elf_Internal_Rela
*irelaend
;
2717 struct bfd_elf_section_reloc_data
*output_reldata
;
2718 asection
*output_section
;
2719 const struct elf_backend_data
*bed
;
2720 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2721 struct bfd_elf_section_data
*esdo
;
2723 output_section
= input_section
->output_section
;
2725 bed
= get_elf_backend_data (output_bfd
);
2726 esdo
= elf_section_data (output_section
);
2727 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2729 output_reldata
= &esdo
->rel
;
2730 swap_out
= bed
->s
->swap_reloc_out
;
2732 else if (esdo
->rela
.hdr
2733 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2735 output_reldata
= &esdo
->rela
;
2736 swap_out
= bed
->s
->swap_reloca_out
;
2741 /* xgettext:c-format */
2742 (_("%pB: relocation size mismatch in %pB section %pA"),
2743 output_bfd
, input_section
->owner
, input_section
);
2744 bfd_set_error (bfd_error_wrong_format
);
2748 erel
= output_reldata
->hdr
->contents
;
2749 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2750 irela
= internal_relocs
;
2751 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2752 * bed
->s
->int_rels_per_ext_rel
);
2753 while (irela
< irelaend
)
2755 (*swap_out
) (output_bfd
, irela
, erel
);
2756 irela
+= bed
->s
->int_rels_per_ext_rel
;
2757 erel
+= input_rel_hdr
->sh_entsize
;
2760 /* Bump the counter, so that we know where to add the next set of
2762 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2767 /* Make weak undefined symbols in PIE dynamic. */
2770 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2771 struct elf_link_hash_entry
*h
)
2773 if (bfd_link_pie (info
)
2775 && h
->root
.type
== bfd_link_hash_undefweak
)
2776 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2781 /* Fix up the flags for a symbol. This handles various cases which
2782 can only be fixed after all the input files are seen. This is
2783 currently called by both adjust_dynamic_symbol and
2784 assign_sym_version, which is unnecessary but perhaps more robust in
2785 the face of future changes. */
2788 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2789 struct elf_info_failed
*eif
)
2791 const struct elf_backend_data
*bed
;
2793 /* If this symbol was mentioned in a non-ELF file, try to set
2794 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2795 permit a non-ELF file to correctly refer to a symbol defined in
2796 an ELF dynamic object. */
2799 while (h
->root
.type
== bfd_link_hash_indirect
)
2800 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2802 if (h
->root
.type
!= bfd_link_hash_defined
2803 && h
->root
.type
!= bfd_link_hash_defweak
)
2806 h
->ref_regular_nonweak
= 1;
2810 if (h
->root
.u
.def
.section
->owner
!= NULL
2811 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2812 == bfd_target_elf_flavour
))
2815 h
->ref_regular_nonweak
= 1;
2821 if (h
->dynindx
== -1
2825 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2834 /* Unfortunately, NON_ELF is only correct if the symbol
2835 was first seen in a non-ELF file. Fortunately, if the symbol
2836 was first seen in an ELF file, we're probably OK unless the
2837 symbol was defined in a non-ELF file. Catch that case here.
2838 FIXME: We're still in trouble if the symbol was first seen in
2839 a dynamic object, and then later in a non-ELF regular object. */
2840 if ((h
->root
.type
== bfd_link_hash_defined
2841 || h
->root
.type
== bfd_link_hash_defweak
)
2843 && (h
->root
.u
.def
.section
->owner
!= NULL
2844 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2845 != bfd_target_elf_flavour
)
2846 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2847 && !h
->def_dynamic
)))
2851 /* Backend specific symbol fixup. */
2852 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2853 if (bed
->elf_backend_fixup_symbol
2854 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2857 /* If this is a final link, and the symbol was defined as a common
2858 symbol in a regular object file, and there was no definition in
2859 any dynamic object, then the linker will have allocated space for
2860 the symbol in a common section but the DEF_REGULAR
2861 flag will not have been set. */
2862 if (h
->root
.type
== bfd_link_hash_defined
2866 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2869 /* Symbols defined in discarded sections shouldn't be dynamic. */
2870 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2871 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2873 /* If a weak undefined symbol has non-default visibility, we also
2874 hide it from the dynamic linker. */
2875 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2876 && h
->root
.type
== bfd_link_hash_undefweak
)
2877 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2879 /* A hidden versioned symbol in executable should be forced local if
2880 it is is locally defined, not referenced by shared library and not
2882 else if (bfd_link_executable (eif
->info
)
2883 && h
->versioned
== versioned_hidden
2884 && !eif
->info
->export_dynamic
2888 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2890 /* If -Bsymbolic was used (which means to bind references to global
2891 symbols to the definition within the shared object), and this
2892 symbol was defined in a regular object, then it actually doesn't
2893 need a PLT entry. Likewise, if the symbol has non-default
2894 visibility. If the symbol has hidden or internal visibility, we
2895 will force it local. */
2896 else if (h
->needs_plt
2897 && bfd_link_pic (eif
->info
)
2898 && is_elf_hash_table (eif
->info
->hash
)
2899 && (SYMBOLIC_BIND (eif
->info
, h
)
2900 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2903 bfd_boolean force_local
;
2905 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2906 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2907 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2910 /* If this is a weak defined symbol in a dynamic object, and we know
2911 the real definition in the dynamic object, copy interesting flags
2912 over to the real definition. */
2913 if (h
->is_weakalias
)
2915 struct elf_link_hash_entry
*def
= weakdef (h
);
2917 /* If the real definition is defined by a regular object file,
2918 don't do anything special. See the longer description in
2919 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2920 bfd_link_hash_defined as it was when put on the alias list
2921 then it must have originally been a versioned symbol (for
2922 which a non-versioned indirect symbol is created) and later
2923 a definition for the non-versioned symbol is found. In that
2924 case the indirection is flipped with the versioned symbol
2925 becoming an indirect pointing at the non-versioned symbol.
2926 Thus, not an alias any more. */
2927 if (def
->def_regular
2928 || def
->root
.type
!= bfd_link_hash_defined
)
2931 while ((h
= h
->u
.alias
) != def
)
2932 h
->is_weakalias
= 0;
2936 while (h
->root
.type
== bfd_link_hash_indirect
)
2937 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2938 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2939 || h
->root
.type
== bfd_link_hash_defweak
);
2940 BFD_ASSERT (def
->def_dynamic
);
2941 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2948 /* Make the backend pick a good value for a dynamic symbol. This is
2949 called via elf_link_hash_traverse, and also calls itself
2953 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2955 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2956 struct elf_link_hash_table
*htab
;
2957 const struct elf_backend_data
*bed
;
2959 if (! is_elf_hash_table (eif
->info
->hash
))
2962 /* Ignore indirect symbols. These are added by the versioning code. */
2963 if (h
->root
.type
== bfd_link_hash_indirect
)
2966 /* Fix the symbol flags. */
2967 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2970 htab
= elf_hash_table (eif
->info
);
2971 bed
= get_elf_backend_data (htab
->dynobj
);
2973 if (h
->root
.type
== bfd_link_hash_undefweak
)
2975 if (eif
->info
->dynamic_undefined_weak
== 0)
2976 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2977 else if (eif
->info
->dynamic_undefined_weak
> 0
2979 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2980 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
2981 h
->root
.root
.string
))
2983 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2991 /* If this symbol does not require a PLT entry, and it is not
2992 defined by a dynamic object, or is not referenced by a regular
2993 object, ignore it. We do have to handle a weak defined symbol,
2994 even if no regular object refers to it, if we decided to add it
2995 to the dynamic symbol table. FIXME: Do we normally need to worry
2996 about symbols which are defined by one dynamic object and
2997 referenced by another one? */
2999 && h
->type
!= STT_GNU_IFUNC
3003 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3005 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3009 /* If we've already adjusted this symbol, don't do it again. This
3010 can happen via a recursive call. */
3011 if (h
->dynamic_adjusted
)
3014 /* Don't look at this symbol again. Note that we must set this
3015 after checking the above conditions, because we may look at a
3016 symbol once, decide not to do anything, and then get called
3017 recursively later after REF_REGULAR is set below. */
3018 h
->dynamic_adjusted
= 1;
3020 /* If this is a weak definition, and we know a real definition, and
3021 the real symbol is not itself defined by a regular object file,
3022 then get a good value for the real definition. We handle the
3023 real symbol first, for the convenience of the backend routine.
3025 Note that there is a confusing case here. If the real definition
3026 is defined by a regular object file, we don't get the real symbol
3027 from the dynamic object, but we do get the weak symbol. If the
3028 processor backend uses a COPY reloc, then if some routine in the
3029 dynamic object changes the real symbol, we will not see that
3030 change in the corresponding weak symbol. This is the way other
3031 ELF linkers work as well, and seems to be a result of the shared
3034 I will clarify this issue. Most SVR4 shared libraries define the
3035 variable _timezone and define timezone as a weak synonym. The
3036 tzset call changes _timezone. If you write
3037 extern int timezone;
3039 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3040 you might expect that, since timezone is a synonym for _timezone,
3041 the same number will print both times. However, if the processor
3042 backend uses a COPY reloc, then actually timezone will be copied
3043 into your process image, and, since you define _timezone
3044 yourself, _timezone will not. Thus timezone and _timezone will
3045 wind up at different memory locations. The tzset call will set
3046 _timezone, leaving timezone unchanged. */
3048 if (h
->is_weakalias
)
3050 struct elf_link_hash_entry
*def
= weakdef (h
);
3052 /* If we get to this point, there is an implicit reference to
3053 the alias by a regular object file via the weak symbol H. */
3054 def
->ref_regular
= 1;
3056 /* Ensure that the backend adjust_dynamic_symbol function sees
3057 the strong alias before H by recursively calling ourselves. */
3058 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3062 /* If a symbol has no type and no size and does not require a PLT
3063 entry, then we are probably about to do the wrong thing here: we
3064 are probably going to create a COPY reloc for an empty object.
3065 This case can arise when a shared object is built with assembly
3066 code, and the assembly code fails to set the symbol type. */
3068 && h
->type
== STT_NOTYPE
3071 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3072 h
->root
.root
.string
);
3074 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3083 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3087 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3088 struct elf_link_hash_entry
*h
,
3091 unsigned int power_of_two
;
3093 asection
*sec
= h
->root
.u
.def
.section
;
3095 /* The section alignment of the definition is the maximum alignment
3096 requirement of symbols defined in the section. Since we don't
3097 know the symbol alignment requirement, we start with the
3098 maximum alignment and check low bits of the symbol address
3099 for the minimum alignment. */
3100 power_of_two
= bfd_section_alignment (sec
);
3101 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3102 while ((h
->root
.u
.def
.value
& mask
) != 0)
3108 if (power_of_two
> bfd_section_alignment (dynbss
))
3110 /* Adjust the section alignment if needed. */
3111 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3115 /* We make sure that the symbol will be aligned properly. */
3116 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3118 /* Define the symbol as being at this point in DYNBSS. */
3119 h
->root
.u
.def
.section
= dynbss
;
3120 h
->root
.u
.def
.value
= dynbss
->size
;
3122 /* Increment the size of DYNBSS to make room for the symbol. */
3123 dynbss
->size
+= h
->size
;
3125 /* No error if extern_protected_data is true. */
3126 if (h
->protected_def
3127 && (!info
->extern_protected_data
3128 || (info
->extern_protected_data
< 0
3129 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3130 info
->callbacks
->einfo
3131 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3132 h
->root
.root
.string
);
3137 /* Adjust all external symbols pointing into SEC_MERGE sections
3138 to reflect the object merging within the sections. */
3141 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3145 if ((h
->root
.type
== bfd_link_hash_defined
3146 || h
->root
.type
== bfd_link_hash_defweak
)
3147 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3148 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3150 bfd
*output_bfd
= (bfd
*) data
;
3152 h
->root
.u
.def
.value
=
3153 _bfd_merged_section_offset (output_bfd
,
3154 &h
->root
.u
.def
.section
,
3155 elf_section_data (sec
)->sec_info
,
3156 h
->root
.u
.def
.value
);
3162 /* Returns false if the symbol referred to by H should be considered
3163 to resolve local to the current module, and true if it should be
3164 considered to bind dynamically. */
3167 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3168 struct bfd_link_info
*info
,
3169 bfd_boolean not_local_protected
)
3171 bfd_boolean binding_stays_local_p
;
3172 const struct elf_backend_data
*bed
;
3173 struct elf_link_hash_table
*hash_table
;
3178 while (h
->root
.type
== bfd_link_hash_indirect
3179 || h
->root
.type
== bfd_link_hash_warning
)
3180 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3182 /* If it was forced local, then clearly it's not dynamic. */
3183 if (h
->dynindx
== -1)
3185 if (h
->forced_local
)
3188 /* Identify the cases where name binding rules say that a
3189 visible symbol resolves locally. */
3190 binding_stays_local_p
= (bfd_link_executable (info
)
3191 || SYMBOLIC_BIND (info
, h
));
3193 switch (ELF_ST_VISIBILITY (h
->other
))
3200 hash_table
= elf_hash_table (info
);
3201 if (!is_elf_hash_table (hash_table
))
3204 bed
= get_elf_backend_data (hash_table
->dynobj
);
3206 /* Proper resolution for function pointer equality may require
3207 that these symbols perhaps be resolved dynamically, even though
3208 we should be resolving them to the current module. */
3209 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3210 binding_stays_local_p
= TRUE
;
3217 /* If it isn't defined locally, then clearly it's dynamic. */
3218 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3221 /* Otherwise, the symbol is dynamic if binding rules don't tell
3222 us that it remains local. */
3223 return !binding_stays_local_p
;
3226 /* Return true if the symbol referred to by H should be considered
3227 to resolve local to the current module, and false otherwise. Differs
3228 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3229 undefined symbols. The two functions are virtually identical except
3230 for the place where dynindx == -1 is tested. If that test is true,
3231 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3232 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3234 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3235 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3236 treatment of undefined weak symbols. For those that do not make
3237 undefined weak symbols dynamic, both functions may return false. */
3240 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3241 struct bfd_link_info
*info
,
3242 bfd_boolean local_protected
)
3244 const struct elf_backend_data
*bed
;
3245 struct elf_link_hash_table
*hash_table
;
3247 /* If it's a local sym, of course we resolve locally. */
3251 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3252 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3253 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3256 /* Forced local symbols resolve locally. */
3257 if (h
->forced_local
)
3260 /* Common symbols that become definitions don't get the DEF_REGULAR
3261 flag set, so test it first, and don't bail out. */
3262 if (ELF_COMMON_DEF_P (h
))
3264 /* If we don't have a definition in a regular file, then we can't
3265 resolve locally. The sym is either undefined or dynamic. */
3266 else if (!h
->def_regular
)
3269 /* Non-dynamic symbols resolve locally. */
3270 if (h
->dynindx
== -1)
3273 /* At this point, we know the symbol is defined and dynamic. In an
3274 executable it must resolve locally, likewise when building symbolic
3275 shared libraries. */
3276 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3279 /* Now deal with defined dynamic symbols in shared libraries. Ones
3280 with default visibility might not resolve locally. */
3281 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3284 hash_table
= elf_hash_table (info
);
3285 if (!is_elf_hash_table (hash_table
))
3288 bed
= get_elf_backend_data (hash_table
->dynobj
);
3290 /* If extern_protected_data is false, STV_PROTECTED non-function
3291 symbols are local. */
3292 if ((!info
->extern_protected_data
3293 || (info
->extern_protected_data
< 0
3294 && !bed
->extern_protected_data
))
3295 && !bed
->is_function_type (h
->type
))
3298 /* Function pointer equality tests may require that STV_PROTECTED
3299 symbols be treated as dynamic symbols. If the address of a
3300 function not defined in an executable is set to that function's
3301 plt entry in the executable, then the address of the function in
3302 a shared library must also be the plt entry in the executable. */
3303 return local_protected
;
3306 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3307 aligned. Returns the first TLS output section. */
3309 struct bfd_section
*
3310 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3312 struct bfd_section
*sec
, *tls
;
3313 unsigned int align
= 0;
3315 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3316 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3320 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3321 if (sec
->alignment_power
> align
)
3322 align
= sec
->alignment_power
;
3324 elf_hash_table (info
)->tls_sec
= tls
;
3326 /* Ensure the alignment of the first section (usually .tdata) is the largest
3327 alignment, so that the tls segment starts aligned. */
3329 tls
->alignment_power
= align
;
3334 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3336 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3337 Elf_Internal_Sym
*sym
)
3339 const struct elf_backend_data
*bed
;
3341 /* Local symbols do not count, but target specific ones might. */
3342 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3343 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3346 bed
= get_elf_backend_data (abfd
);
3347 /* Function symbols do not count. */
3348 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3351 /* If the section is undefined, then so is the symbol. */
3352 if (sym
->st_shndx
== SHN_UNDEF
)
3355 /* If the symbol is defined in the common section, then
3356 it is a common definition and so does not count. */
3357 if (bed
->common_definition (sym
))
3360 /* If the symbol is in a target specific section then we
3361 must rely upon the backend to tell us what it is. */
3362 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3363 /* FIXME - this function is not coded yet:
3365 return _bfd_is_global_symbol_definition (abfd, sym);
3367 Instead for now assume that the definition is not global,
3368 Even if this is wrong, at least the linker will behave
3369 in the same way that it used to do. */
3375 /* Search the symbol table of the archive element of the archive ABFD
3376 whose archive map contains a mention of SYMDEF, and determine if
3377 the symbol is defined in this element. */
3379 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3381 Elf_Internal_Shdr
* hdr
;
3385 Elf_Internal_Sym
*isymbuf
;
3386 Elf_Internal_Sym
*isym
;
3387 Elf_Internal_Sym
*isymend
;
3390 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3394 if (! bfd_check_format (abfd
, bfd_object
))
3397 /* Select the appropriate symbol table. If we don't know if the
3398 object file is an IR object, give linker LTO plugin a chance to
3399 get the correct symbol table. */
3400 if (abfd
->plugin_format
== bfd_plugin_yes
3401 #if BFD_SUPPORTS_PLUGINS
3402 || (abfd
->plugin_format
== bfd_plugin_unknown
3403 && bfd_link_plugin_object_p (abfd
))
3407 /* Use the IR symbol table if the object has been claimed by
3409 abfd
= abfd
->plugin_dummy_bfd
;
3410 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3412 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3413 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3415 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3417 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3419 /* The sh_info field of the symtab header tells us where the
3420 external symbols start. We don't care about the local symbols. */
3421 if (elf_bad_symtab (abfd
))
3423 extsymcount
= symcount
;
3428 extsymcount
= symcount
- hdr
->sh_info
;
3429 extsymoff
= hdr
->sh_info
;
3432 if (extsymcount
== 0)
3435 /* Read in the symbol table. */
3436 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3438 if (isymbuf
== NULL
)
3441 /* Scan the symbol table looking for SYMDEF. */
3443 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3447 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3452 if (strcmp (name
, symdef
->name
) == 0)
3454 result
= is_global_data_symbol_definition (abfd
, isym
);
3464 /* Add an entry to the .dynamic table. */
3467 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3471 struct elf_link_hash_table
*hash_table
;
3472 const struct elf_backend_data
*bed
;
3474 bfd_size_type newsize
;
3475 bfd_byte
*newcontents
;
3476 Elf_Internal_Dyn dyn
;
3478 hash_table
= elf_hash_table (info
);
3479 if (! is_elf_hash_table (hash_table
))
3482 if (tag
== DT_RELA
|| tag
== DT_REL
)
3483 hash_table
->dynamic_relocs
= TRUE
;
3485 bed
= get_elf_backend_data (hash_table
->dynobj
);
3486 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3487 BFD_ASSERT (s
!= NULL
);
3489 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3490 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3491 if (newcontents
== NULL
)
3495 dyn
.d_un
.d_val
= val
;
3496 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3499 s
->contents
= newcontents
;
3504 /* Strip zero-sized dynamic sections. */
3507 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3509 struct elf_link_hash_table
*hash_table
;
3510 const struct elf_backend_data
*bed
;
3511 asection
*s
, *sdynamic
, **pp
;
3512 asection
*rela_dyn
, *rel_dyn
;
3513 Elf_Internal_Dyn dyn
;
3514 bfd_byte
*extdyn
, *next
;
3515 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3516 bfd_boolean strip_zero_sized
;
3517 bfd_boolean strip_zero_sized_plt
;
3519 if (bfd_link_relocatable (info
))
3522 hash_table
= elf_hash_table (info
);
3523 if (!is_elf_hash_table (hash_table
))
3526 if (!hash_table
->dynobj
)
3529 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3533 bed
= get_elf_backend_data (hash_table
->dynobj
);
3534 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3536 strip_zero_sized
= FALSE
;
3537 strip_zero_sized_plt
= FALSE
;
3539 /* Strip zero-sized dynamic sections. */
3540 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3541 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3542 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3546 || s
== hash_table
->srelplt
->output_section
3547 || s
== hash_table
->splt
->output_section
))
3550 info
->output_bfd
->section_count
--;
3551 strip_zero_sized
= TRUE
;
3556 else if (s
== hash_table
->splt
->output_section
)
3558 s
= hash_table
->splt
;
3559 strip_zero_sized_plt
= TRUE
;
3562 s
= hash_table
->srelplt
;
3563 s
->flags
|= SEC_EXCLUDE
;
3564 s
->output_section
= bfd_abs_section_ptr
;
3569 if (strip_zero_sized_plt
)
3570 for (extdyn
= sdynamic
->contents
;
3571 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3574 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3575 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3583 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3584 the procedure linkage table (the .plt section) has been
3586 memmove (extdyn
, next
,
3587 sdynamic
->size
- (next
- sdynamic
->contents
));
3592 if (strip_zero_sized
)
3594 /* Regenerate program headers. */
3595 elf_seg_map (info
->output_bfd
) = NULL
;
3596 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
);
3602 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3603 1 if a DT_NEEDED tag already exists, and 0 on success. */
3606 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3608 struct elf_link_hash_table
*hash_table
;
3612 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3615 hash_table
= elf_hash_table (info
);
3616 soname
= elf_dt_name (abfd
);
3617 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3618 if (strindex
== (size_t) -1)
3621 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3624 const struct elf_backend_data
*bed
;
3627 bed
= get_elf_backend_data (hash_table
->dynobj
);
3628 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3630 for (extdyn
= sdyn
->contents
;
3631 extdyn
< sdyn
->contents
+ sdyn
->size
;
3632 extdyn
+= bed
->s
->sizeof_dyn
)
3634 Elf_Internal_Dyn dyn
;
3636 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3637 if (dyn
.d_tag
== DT_NEEDED
3638 && dyn
.d_un
.d_val
== strindex
)
3640 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3646 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3649 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3655 /* Return true if SONAME is on the needed list between NEEDED and STOP
3656 (or the end of list if STOP is NULL), and needed by a library that
3660 on_needed_list (const char *soname
,
3661 struct bfd_link_needed_list
*needed
,
3662 struct bfd_link_needed_list
*stop
)
3664 struct bfd_link_needed_list
*look
;
3665 for (look
= needed
; look
!= stop
; look
= look
->next
)
3666 if (strcmp (soname
, look
->name
) == 0
3667 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3668 /* If needed by a library that itself is not directly
3669 needed, recursively check whether that library is
3670 indirectly needed. Since we add DT_NEEDED entries to
3671 the end of the list, library dependencies appear after
3672 the library. Therefore search prior to the current
3673 LOOK, preventing possible infinite recursion. */
3674 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3680 /* Sort symbol by value, section, size, and type. */
3682 elf_sort_symbol (const void *arg1
, const void *arg2
)
3684 const struct elf_link_hash_entry
*h1
;
3685 const struct elf_link_hash_entry
*h2
;
3686 bfd_signed_vma vdiff
;
3691 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3692 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3693 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3695 return vdiff
> 0 ? 1 : -1;
3697 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3701 /* Sort so that sized symbols are selected over zero size symbols. */
3702 vdiff
= h1
->size
- h2
->size
;
3704 return vdiff
> 0 ? 1 : -1;
3706 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3707 if (h1
->type
!= h2
->type
)
3708 return h1
->type
- h2
->type
;
3710 /* If symbols are properly sized and typed, and multiple strong
3711 aliases are not defined in a shared library by the user we
3712 shouldn't get here. Unfortunately linker script symbols like
3713 __bss_start sometimes match a user symbol defined at the start of
3714 .bss without proper size and type. We'd like to preference the
3715 user symbol over reserved system symbols. Sort on leading
3717 n1
= h1
->root
.root
.string
;
3718 n2
= h2
->root
.root
.string
;
3731 /* Final sort on name selects user symbols like '_u' over reserved
3732 system symbols like '_Z' and also will avoid qsort instability. */
3736 /* This function is used to adjust offsets into .dynstr for
3737 dynamic symbols. This is called via elf_link_hash_traverse. */
3740 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3742 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3744 if (h
->dynindx
!= -1)
3745 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3749 /* Assign string offsets in .dynstr, update all structures referencing
3753 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3755 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3756 struct elf_link_local_dynamic_entry
*entry
;
3757 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3758 bfd
*dynobj
= hash_table
->dynobj
;
3761 const struct elf_backend_data
*bed
;
3764 _bfd_elf_strtab_finalize (dynstr
);
3765 size
= _bfd_elf_strtab_size (dynstr
);
3767 bed
= get_elf_backend_data (dynobj
);
3768 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3769 BFD_ASSERT (sdyn
!= NULL
);
3771 /* Update all .dynamic entries referencing .dynstr strings. */
3772 for (extdyn
= sdyn
->contents
;
3773 extdyn
< sdyn
->contents
+ sdyn
->size
;
3774 extdyn
+= bed
->s
->sizeof_dyn
)
3776 Elf_Internal_Dyn dyn
;
3778 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3782 dyn
.d_un
.d_val
= size
;
3792 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3797 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3800 /* Now update local dynamic symbols. */
3801 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3802 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3803 entry
->isym
.st_name
);
3805 /* And the rest of dynamic symbols. */
3806 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3808 /* Adjust version definitions. */
3809 if (elf_tdata (output_bfd
)->cverdefs
)
3814 Elf_Internal_Verdef def
;
3815 Elf_Internal_Verdaux defaux
;
3817 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3821 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3823 p
+= sizeof (Elf_External_Verdef
);
3824 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3826 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3828 _bfd_elf_swap_verdaux_in (output_bfd
,
3829 (Elf_External_Verdaux
*) p
, &defaux
);
3830 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3832 _bfd_elf_swap_verdaux_out (output_bfd
,
3833 &defaux
, (Elf_External_Verdaux
*) p
);
3834 p
+= sizeof (Elf_External_Verdaux
);
3837 while (def
.vd_next
);
3840 /* Adjust version references. */
3841 if (elf_tdata (output_bfd
)->verref
)
3846 Elf_Internal_Verneed need
;
3847 Elf_Internal_Vernaux needaux
;
3849 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3853 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3855 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3856 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3857 (Elf_External_Verneed
*) p
);
3858 p
+= sizeof (Elf_External_Verneed
);
3859 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3861 _bfd_elf_swap_vernaux_in (output_bfd
,
3862 (Elf_External_Vernaux
*) p
, &needaux
);
3863 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3865 _bfd_elf_swap_vernaux_out (output_bfd
,
3867 (Elf_External_Vernaux
*) p
);
3868 p
+= sizeof (Elf_External_Vernaux
);
3871 while (need
.vn_next
);
3877 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3878 The default is to only match when the INPUT and OUTPUT are exactly
3882 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3883 const bfd_target
*output
)
3885 return input
== output
;
3888 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3889 This version is used when different targets for the same architecture
3890 are virtually identical. */
3893 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3894 const bfd_target
*output
)
3896 const struct elf_backend_data
*obed
, *ibed
;
3898 if (input
== output
)
3901 ibed
= xvec_get_elf_backend_data (input
);
3902 obed
= xvec_get_elf_backend_data (output
);
3904 if (ibed
->arch
!= obed
->arch
)
3907 /* If both backends are using this function, deem them compatible. */
3908 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3911 /* Make a special call to the linker "notice" function to tell it that
3912 we are about to handle an as-needed lib, or have finished
3913 processing the lib. */
3916 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3917 struct bfd_link_info
*info
,
3918 enum notice_asneeded_action act
)
3920 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3923 /* Check relocations an ELF object file. */
3926 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3928 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3929 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3931 /* If this object is the same format as the output object, and it is
3932 not a shared library, then let the backend look through the
3935 This is required to build global offset table entries and to
3936 arrange for dynamic relocs. It is not required for the
3937 particular common case of linking non PIC code, even when linking
3938 against shared libraries, but unfortunately there is no way of
3939 knowing whether an object file has been compiled PIC or not.
3940 Looking through the relocs is not particularly time consuming.
3941 The problem is that we must either (1) keep the relocs in memory,
3942 which causes the linker to require additional runtime memory or
3943 (2) read the relocs twice from the input file, which wastes time.
3944 This would be a good case for using mmap.
3946 I have no idea how to handle linking PIC code into a file of a
3947 different format. It probably can't be done. */
3948 if ((abfd
->flags
& DYNAMIC
) == 0
3949 && is_elf_hash_table (htab
)
3950 && bed
->check_relocs
!= NULL
3951 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
3952 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
3956 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3958 Elf_Internal_Rela
*internal_relocs
;
3961 /* Don't check relocations in excluded sections. */
3962 if ((o
->flags
& SEC_RELOC
) == 0
3963 || (o
->flags
& SEC_EXCLUDE
) != 0
3964 || o
->reloc_count
== 0
3965 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
3966 && (o
->flags
& SEC_DEBUGGING
) != 0)
3967 || bfd_is_abs_section (o
->output_section
))
3970 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
3972 if (internal_relocs
== NULL
)
3975 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
3977 if (elf_section_data (o
)->relocs
!= internal_relocs
)
3978 free (internal_relocs
);
3988 /* Add symbols from an ELF object file to the linker hash table. */
3991 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3993 Elf_Internal_Ehdr
*ehdr
;
3994 Elf_Internal_Shdr
*hdr
;
3998 struct elf_link_hash_entry
**sym_hash
;
3999 bfd_boolean dynamic
;
4000 Elf_External_Versym
*extversym
= NULL
;
4001 Elf_External_Versym
*extversym_end
= NULL
;
4002 Elf_External_Versym
*ever
;
4003 struct elf_link_hash_entry
*weaks
;
4004 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4005 size_t nondeflt_vers_cnt
= 0;
4006 Elf_Internal_Sym
*isymbuf
= NULL
;
4007 Elf_Internal_Sym
*isym
;
4008 Elf_Internal_Sym
*isymend
;
4009 const struct elf_backend_data
*bed
;
4010 bfd_boolean add_needed
;
4011 struct elf_link_hash_table
*htab
;
4012 void *alloc_mark
= NULL
;
4013 struct bfd_hash_entry
**old_table
= NULL
;
4014 unsigned int old_size
= 0;
4015 unsigned int old_count
= 0;
4016 void *old_tab
= NULL
;
4018 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4019 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4020 void *old_strtab
= NULL
;
4023 bfd_boolean just_syms
;
4025 htab
= elf_hash_table (info
);
4026 bed
= get_elf_backend_data (abfd
);
4028 if ((abfd
->flags
& DYNAMIC
) == 0)
4034 /* You can't use -r against a dynamic object. Also, there's no
4035 hope of using a dynamic object which does not exactly match
4036 the format of the output file. */
4037 if (bfd_link_relocatable (info
)
4038 || !is_elf_hash_table (htab
)
4039 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4041 if (bfd_link_relocatable (info
))
4042 bfd_set_error (bfd_error_invalid_operation
);
4044 bfd_set_error (bfd_error_wrong_format
);
4049 ehdr
= elf_elfheader (abfd
);
4050 if (info
->warn_alternate_em
4051 && bed
->elf_machine_code
!= ehdr
->e_machine
4052 && ((bed
->elf_machine_alt1
!= 0
4053 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4054 || (bed
->elf_machine_alt2
!= 0
4055 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4057 /* xgettext:c-format */
4058 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4059 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4061 /* As a GNU extension, any input sections which are named
4062 .gnu.warning.SYMBOL are treated as warning symbols for the given
4063 symbol. This differs from .gnu.warning sections, which generate
4064 warnings when they are included in an output file. */
4065 /* PR 12761: Also generate this warning when building shared libraries. */
4066 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4070 name
= bfd_section_name (s
);
4071 if (CONST_STRNEQ (name
, ".gnu.warning."))
4076 name
+= sizeof ".gnu.warning." - 1;
4078 /* If this is a shared object, then look up the symbol
4079 in the hash table. If it is there, and it is already
4080 been defined, then we will not be using the entry
4081 from this shared object, so we don't need to warn.
4082 FIXME: If we see the definition in a regular object
4083 later on, we will warn, but we shouldn't. The only
4084 fix is to keep track of what warnings we are supposed
4085 to emit, and then handle them all at the end of the
4089 struct elf_link_hash_entry
*h
;
4091 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
4093 /* FIXME: What about bfd_link_hash_common? */
4095 && (h
->root
.type
== bfd_link_hash_defined
4096 || h
->root
.type
== bfd_link_hash_defweak
))
4101 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4105 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4110 if (! (_bfd_generic_link_add_one_symbol
4111 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4112 FALSE
, bed
->collect
, NULL
)))
4115 if (bfd_link_executable (info
))
4117 /* Clobber the section size so that the warning does
4118 not get copied into the output file. */
4121 /* Also set SEC_EXCLUDE, so that symbols defined in
4122 the warning section don't get copied to the output. */
4123 s
->flags
|= SEC_EXCLUDE
;
4128 just_syms
= ((s
= abfd
->sections
) != NULL
4129 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4134 /* If we are creating a shared library, create all the dynamic
4135 sections immediately. We need to attach them to something,
4136 so we attach them to this BFD, provided it is the right
4137 format and is not from ld --just-symbols. Always create the
4138 dynamic sections for -E/--dynamic-list. FIXME: If there
4139 are no input BFD's of the same format as the output, we can't
4140 make a shared library. */
4142 && (bfd_link_pic (info
)
4143 || (!bfd_link_relocatable (info
)
4145 && (info
->export_dynamic
|| info
->dynamic
)))
4146 && is_elf_hash_table (htab
)
4147 && info
->output_bfd
->xvec
== abfd
->xvec
4148 && !htab
->dynamic_sections_created
)
4150 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4154 else if (!is_elf_hash_table (htab
))
4158 const char *soname
= NULL
;
4160 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4161 const Elf_Internal_Phdr
*phdr
;
4162 struct elf_link_loaded_list
*loaded_lib
;
4164 /* ld --just-symbols and dynamic objects don't mix very well.
4165 ld shouldn't allow it. */
4169 /* If this dynamic lib was specified on the command line with
4170 --as-needed in effect, then we don't want to add a DT_NEEDED
4171 tag unless the lib is actually used. Similary for libs brought
4172 in by another lib's DT_NEEDED. When --no-add-needed is used
4173 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4174 any dynamic library in DT_NEEDED tags in the dynamic lib at
4176 add_needed
= (elf_dyn_lib_class (abfd
)
4177 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4178 | DYN_NO_NEEDED
)) == 0;
4180 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4185 unsigned int elfsec
;
4186 unsigned long shlink
;
4188 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4195 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4196 if (elfsec
== SHN_BAD
)
4197 goto error_free_dyn
;
4198 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4200 for (extdyn
= dynbuf
;
4201 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4202 extdyn
+= bed
->s
->sizeof_dyn
)
4204 Elf_Internal_Dyn dyn
;
4206 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4207 if (dyn
.d_tag
== DT_SONAME
)
4209 unsigned int tagv
= dyn
.d_un
.d_val
;
4210 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4212 goto error_free_dyn
;
4214 if (dyn
.d_tag
== DT_NEEDED
)
4216 struct bfd_link_needed_list
*n
, **pn
;
4218 unsigned int tagv
= dyn
.d_un
.d_val
;
4219 size_t amt
= sizeof (struct bfd_link_needed_list
);
4221 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4222 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4223 if (n
== NULL
|| fnm
== NULL
)
4224 goto error_free_dyn
;
4225 amt
= strlen (fnm
) + 1;
4226 anm
= (char *) bfd_alloc (abfd
, amt
);
4228 goto error_free_dyn
;
4229 memcpy (anm
, fnm
, amt
);
4233 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4237 if (dyn
.d_tag
== DT_RUNPATH
)
4239 struct bfd_link_needed_list
*n
, **pn
;
4241 unsigned int tagv
= dyn
.d_un
.d_val
;
4242 size_t amt
= sizeof (struct bfd_link_needed_list
);
4244 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4245 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4246 if (n
== NULL
|| fnm
== NULL
)
4247 goto error_free_dyn
;
4248 amt
= strlen (fnm
) + 1;
4249 anm
= (char *) bfd_alloc (abfd
, amt
);
4251 goto error_free_dyn
;
4252 memcpy (anm
, fnm
, amt
);
4256 for (pn
= & runpath
;
4262 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4263 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4265 struct bfd_link_needed_list
*n
, **pn
;
4267 unsigned int tagv
= dyn
.d_un
.d_val
;
4268 size_t amt
= sizeof (struct bfd_link_needed_list
);
4270 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4271 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4272 if (n
== NULL
|| fnm
== NULL
)
4273 goto error_free_dyn
;
4274 amt
= strlen (fnm
) + 1;
4275 anm
= (char *) bfd_alloc (abfd
, amt
);
4277 goto error_free_dyn
;
4278 memcpy (anm
, fnm
, amt
);
4288 if (dyn
.d_tag
== DT_AUDIT
)
4290 unsigned int tagv
= dyn
.d_un
.d_val
;
4291 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4298 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4299 frees all more recently bfd_alloc'd blocks as well. */
4305 struct bfd_link_needed_list
**pn
;
4306 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4311 /* If we have a PT_GNU_RELRO program header, mark as read-only
4312 all sections contained fully therein. This makes relro
4313 shared library sections appear as they will at run-time. */
4314 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4315 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4316 if (phdr
->p_type
== PT_GNU_RELRO
)
4318 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4320 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4322 if ((s
->flags
& SEC_ALLOC
) != 0
4323 && s
->vma
* opb
>= phdr
->p_vaddr
4324 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4325 s
->flags
|= SEC_READONLY
;
4330 /* We do not want to include any of the sections in a dynamic
4331 object in the output file. We hack by simply clobbering the
4332 list of sections in the BFD. This could be handled more
4333 cleanly by, say, a new section flag; the existing
4334 SEC_NEVER_LOAD flag is not the one we want, because that one
4335 still implies that the section takes up space in the output
4337 bfd_section_list_clear (abfd
);
4339 /* Find the name to use in a DT_NEEDED entry that refers to this
4340 object. If the object has a DT_SONAME entry, we use it.
4341 Otherwise, if the generic linker stuck something in
4342 elf_dt_name, we use that. Otherwise, we just use the file
4344 if (soname
== NULL
|| *soname
== '\0')
4346 soname
= elf_dt_name (abfd
);
4347 if (soname
== NULL
|| *soname
== '\0')
4348 soname
= bfd_get_filename (abfd
);
4351 /* Save the SONAME because sometimes the linker emulation code
4352 will need to know it. */
4353 elf_dt_name (abfd
) = soname
;
4355 /* If we have already included this dynamic object in the
4356 link, just ignore it. There is no reason to include a
4357 particular dynamic object more than once. */
4358 for (loaded_lib
= htab
->dyn_loaded
;
4360 loaded_lib
= loaded_lib
->next
)
4362 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4366 /* Create dynamic sections for backends that require that be done
4367 before setup_gnu_properties. */
4369 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4372 /* Save the DT_AUDIT entry for the linker emulation code. */
4373 elf_dt_audit (abfd
) = audit
;
4376 /* If this is a dynamic object, we always link against the .dynsym
4377 symbol table, not the .symtab symbol table. The dynamic linker
4378 will only see the .dynsym symbol table, so there is no reason to
4379 look at .symtab for a dynamic object. */
4381 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4382 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4384 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4386 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4388 /* The sh_info field of the symtab header tells us where the
4389 external symbols start. We don't care about the local symbols at
4391 if (elf_bad_symtab (abfd
))
4393 extsymcount
= symcount
;
4398 extsymcount
= symcount
- hdr
->sh_info
;
4399 extsymoff
= hdr
->sh_info
;
4402 sym_hash
= elf_sym_hashes (abfd
);
4403 if (extsymcount
!= 0)
4405 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4407 if (isymbuf
== NULL
)
4410 if (sym_hash
== NULL
)
4412 /* We store a pointer to the hash table entry for each
4414 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4415 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4416 if (sym_hash
== NULL
)
4417 goto error_free_sym
;
4418 elf_sym_hashes (abfd
) = sym_hash
;
4424 /* Read in any version definitions. */
4425 if (!_bfd_elf_slurp_version_tables (abfd
,
4426 info
->default_imported_symver
))
4427 goto error_free_sym
;
4429 /* Read in the symbol versions, but don't bother to convert them
4430 to internal format. */
4431 if (elf_dynversym (abfd
) != 0)
4433 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4434 bfd_size_type amt
= versymhdr
->sh_size
;
4436 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4437 goto error_free_sym
;
4438 extversym
= (Elf_External_Versym
*)
4439 _bfd_malloc_and_read (abfd
, amt
, amt
);
4440 if (extversym
== NULL
)
4441 goto error_free_sym
;
4442 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4446 /* If we are loading an as-needed shared lib, save the symbol table
4447 state before we start adding symbols. If the lib turns out
4448 to be unneeded, restore the state. */
4449 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4454 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4456 struct bfd_hash_entry
*p
;
4457 struct elf_link_hash_entry
*h
;
4459 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4461 h
= (struct elf_link_hash_entry
*) p
;
4462 entsize
+= htab
->root
.table
.entsize
;
4463 if (h
->root
.type
== bfd_link_hash_warning
)
4464 entsize
+= htab
->root
.table
.entsize
;
4468 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4469 old_tab
= bfd_malloc (tabsize
+ entsize
);
4470 if (old_tab
== NULL
)
4471 goto error_free_vers
;
4473 /* Remember the current objalloc pointer, so that all mem for
4474 symbols added can later be reclaimed. */
4475 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4476 if (alloc_mark
== NULL
)
4477 goto error_free_vers
;
4479 /* Make a special call to the linker "notice" function to
4480 tell it that we are about to handle an as-needed lib. */
4481 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4482 goto error_free_vers
;
4484 /* Clone the symbol table. Remember some pointers into the
4485 symbol table, and dynamic symbol count. */
4486 old_ent
= (char *) old_tab
+ tabsize
;
4487 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4488 old_undefs
= htab
->root
.undefs
;
4489 old_undefs_tail
= htab
->root
.undefs_tail
;
4490 old_table
= htab
->root
.table
.table
;
4491 old_size
= htab
->root
.table
.size
;
4492 old_count
= htab
->root
.table
.count
;
4494 if (htab
->dynstr
!= NULL
)
4496 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4497 if (old_strtab
== NULL
)
4498 goto error_free_vers
;
4501 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4503 struct bfd_hash_entry
*p
;
4504 struct elf_link_hash_entry
*h
;
4506 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4508 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
4509 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4510 h
= (struct elf_link_hash_entry
*) p
;
4511 if (h
->root
.type
== bfd_link_hash_warning
)
4513 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
4514 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4521 if (extversym
== NULL
)
4523 else if (extversym
+ extsymoff
< extversym_end
)
4524 ever
= extversym
+ extsymoff
;
4527 /* xgettext:c-format */
4528 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4529 abfd
, (long) extsymoff
,
4530 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4531 bfd_set_error (bfd_error_bad_value
);
4532 goto error_free_vers
;
4535 if (!bfd_link_relocatable (info
)
4536 && abfd
->lto_slim_object
)
4539 (_("%pB: plugin needed to handle lto object"), abfd
);
4542 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4544 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4548 asection
*sec
, *new_sec
;
4551 struct elf_link_hash_entry
*h
;
4552 struct elf_link_hash_entry
*hi
;
4553 bfd_boolean definition
;
4554 bfd_boolean size_change_ok
;
4555 bfd_boolean type_change_ok
;
4556 bfd_boolean new_weak
;
4557 bfd_boolean old_weak
;
4558 bfd_boolean override
;
4560 bfd_boolean discarded
;
4561 unsigned int old_alignment
;
4562 unsigned int shindex
;
4564 bfd_boolean matched
;
4568 flags
= BSF_NO_FLAGS
;
4570 value
= isym
->st_value
;
4571 common
= bed
->common_definition (isym
);
4572 if (common
&& info
->inhibit_common_definition
)
4574 /* Treat common symbol as undefined for --no-define-common. */
4575 isym
->st_shndx
= SHN_UNDEF
;
4580 bind
= ELF_ST_BIND (isym
->st_info
);
4584 /* This should be impossible, since ELF requires that all
4585 global symbols follow all local symbols, and that sh_info
4586 point to the first global symbol. Unfortunately, Irix 5
4588 if (elf_bad_symtab (abfd
))
4591 /* If we aren't prepared to handle locals within the globals
4592 then we'll likely segfault on a NULL symbol hash if the
4593 symbol is ever referenced in relocations. */
4594 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4595 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4596 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4597 " (>= sh_info of %lu)"),
4598 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4601 /* Dynamic object relocations are not processed by ld, so
4602 ld won't run into the problem mentioned above. */
4605 bfd_set_error (bfd_error_bad_value
);
4606 goto error_free_vers
;
4609 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4617 case STB_GNU_UNIQUE
:
4618 flags
= BSF_GNU_UNIQUE
;
4622 /* Leave it up to the processor backend. */
4626 if (isym
->st_shndx
== SHN_UNDEF
)
4627 sec
= bfd_und_section_ptr
;
4628 else if (isym
->st_shndx
== SHN_ABS
)
4629 sec
= bfd_abs_section_ptr
;
4630 else if (isym
->st_shndx
== SHN_COMMON
)
4632 sec
= bfd_com_section_ptr
;
4633 /* What ELF calls the size we call the value. What ELF
4634 calls the value we call the alignment. */
4635 value
= isym
->st_size
;
4639 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4641 sec
= bfd_abs_section_ptr
;
4642 else if (discarded_section (sec
))
4644 /* Symbols from discarded section are undefined. We keep
4646 sec
= bfd_und_section_ptr
;
4648 isym
->st_shndx
= SHN_UNDEF
;
4650 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4654 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4657 goto error_free_vers
;
4659 if (isym
->st_shndx
== SHN_COMMON
4660 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4662 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4666 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4668 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4670 goto error_free_vers
;
4674 else if (isym
->st_shndx
== SHN_COMMON
4675 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4676 && !bfd_link_relocatable (info
))
4678 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4682 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4683 | SEC_LINKER_CREATED
);
4684 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4686 goto error_free_vers
;
4690 else if (bed
->elf_add_symbol_hook
)
4692 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4694 goto error_free_vers
;
4696 /* The hook function sets the name to NULL if this symbol
4697 should be skipped for some reason. */
4702 /* Sanity check that all possibilities were handled. */
4706 /* Silently discard TLS symbols from --just-syms. There's
4707 no way to combine a static TLS block with a new TLS block
4708 for this executable. */
4709 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4710 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4713 if (bfd_is_und_section (sec
)
4714 || bfd_is_com_section (sec
))
4719 size_change_ok
= FALSE
;
4720 type_change_ok
= bed
->type_change_ok
;
4727 if (is_elf_hash_table (htab
))
4729 Elf_Internal_Versym iver
;
4730 unsigned int vernum
= 0;
4735 if (info
->default_imported_symver
)
4736 /* Use the default symbol version created earlier. */
4737 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4741 else if (ever
>= extversym_end
)
4743 /* xgettext:c-format */
4744 _bfd_error_handler (_("%pB: not enough version information"),
4746 bfd_set_error (bfd_error_bad_value
);
4747 goto error_free_vers
;
4750 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4752 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4754 /* If this is a hidden symbol, or if it is not version
4755 1, we append the version name to the symbol name.
4756 However, we do not modify a non-hidden absolute symbol
4757 if it is not a function, because it might be the version
4758 symbol itself. FIXME: What if it isn't? */
4759 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4761 && (!bfd_is_abs_section (sec
)
4762 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4765 size_t namelen
, verlen
, newlen
;
4768 if (isym
->st_shndx
!= SHN_UNDEF
)
4770 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4772 else if (vernum
> 1)
4774 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4781 /* xgettext:c-format */
4782 (_("%pB: %s: invalid version %u (max %d)"),
4784 elf_tdata (abfd
)->cverdefs
);
4785 bfd_set_error (bfd_error_bad_value
);
4786 goto error_free_vers
;
4791 /* We cannot simply test for the number of
4792 entries in the VERNEED section since the
4793 numbers for the needed versions do not start
4795 Elf_Internal_Verneed
*t
;
4798 for (t
= elf_tdata (abfd
)->verref
;
4802 Elf_Internal_Vernaux
*a
;
4804 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4806 if (a
->vna_other
== vernum
)
4808 verstr
= a
->vna_nodename
;
4818 /* xgettext:c-format */
4819 (_("%pB: %s: invalid needed version %d"),
4820 abfd
, name
, vernum
);
4821 bfd_set_error (bfd_error_bad_value
);
4822 goto error_free_vers
;
4826 namelen
= strlen (name
);
4827 verlen
= strlen (verstr
);
4828 newlen
= namelen
+ verlen
+ 2;
4829 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4830 && isym
->st_shndx
!= SHN_UNDEF
)
4833 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4834 if (newname
== NULL
)
4835 goto error_free_vers
;
4836 memcpy (newname
, name
, namelen
);
4837 p
= newname
+ namelen
;
4839 /* If this is a defined non-hidden version symbol,
4840 we add another @ to the name. This indicates the
4841 default version of the symbol. */
4842 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4843 && isym
->st_shndx
!= SHN_UNDEF
)
4845 memcpy (p
, verstr
, verlen
+ 1);
4850 /* If this symbol has default visibility and the user has
4851 requested we not re-export it, then mark it as hidden. */
4852 if (!bfd_is_und_section (sec
)
4855 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4856 isym
->st_other
= (STV_HIDDEN
4857 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4859 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4860 sym_hash
, &old_bfd
, &old_weak
,
4861 &old_alignment
, &skip
, &override
,
4862 &type_change_ok
, &size_change_ok
,
4864 goto error_free_vers
;
4869 /* Override a definition only if the new symbol matches the
4871 if (override
&& matched
)
4875 while (h
->root
.type
== bfd_link_hash_indirect
4876 || h
->root
.type
== bfd_link_hash_warning
)
4877 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4879 if (elf_tdata (abfd
)->verdef
!= NULL
4882 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4885 if (! (_bfd_generic_link_add_one_symbol
4886 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4887 (struct bfd_link_hash_entry
**) sym_hash
)))
4888 goto error_free_vers
;
4891 /* We need to make sure that indirect symbol dynamic flags are
4894 while (h
->root
.type
== bfd_link_hash_indirect
4895 || h
->root
.type
== bfd_link_hash_warning
)
4896 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4898 /* Setting the index to -3 tells elf_link_output_extsym that
4899 this symbol is defined in a discarded section. */
4905 new_weak
= (flags
& BSF_WEAK
) != 0;
4909 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4910 && is_elf_hash_table (htab
)
4911 && h
->u
.alias
== NULL
)
4913 /* Keep a list of all weak defined non function symbols from
4914 a dynamic object, using the alias field. Later in this
4915 function we will set the alias field to the correct
4916 value. We only put non-function symbols from dynamic
4917 objects on this list, because that happens to be the only
4918 time we need to know the normal symbol corresponding to a
4919 weak symbol, and the information is time consuming to
4920 figure out. If the alias field is not already NULL,
4921 then this symbol was already defined by some previous
4922 dynamic object, and we will be using that previous
4923 definition anyhow. */
4929 /* Set the alignment of a common symbol. */
4930 if ((common
|| bfd_is_com_section (sec
))
4931 && h
->root
.type
== bfd_link_hash_common
)
4936 align
= bfd_log2 (isym
->st_value
);
4939 /* The new symbol is a common symbol in a shared object.
4940 We need to get the alignment from the section. */
4941 align
= new_sec
->alignment_power
;
4943 if (align
> old_alignment
)
4944 h
->root
.u
.c
.p
->alignment_power
= align
;
4946 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4949 if (is_elf_hash_table (htab
))
4951 /* Set a flag in the hash table entry indicating the type of
4952 reference or definition we just found. A dynamic symbol
4953 is one which is referenced or defined by both a regular
4954 object and a shared object. */
4955 bfd_boolean dynsym
= FALSE
;
4957 /* Plugin symbols aren't normal. Don't set def_regular or
4958 ref_regular for them, or make them dynamic. */
4959 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4966 if (bind
!= STB_WEAK
)
4967 h
->ref_regular_nonweak
= 1;
4979 /* If the indirect symbol has been forced local, don't
4980 make the real symbol dynamic. */
4981 if ((h
== hi
|| !hi
->forced_local
)
4982 && (bfd_link_dll (info
)
4992 hi
->ref_dynamic
= 1;
4997 hi
->def_dynamic
= 1;
5000 /* If the indirect symbol has been forced local, don't
5001 make the real symbol dynamic. */
5002 if ((h
== hi
|| !hi
->forced_local
)
5006 && weakdef (h
)->dynindx
!= -1)))
5010 /* Check to see if we need to add an indirect symbol for
5011 the default name. */
5013 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5014 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5015 sec
, value
, &old_bfd
, &dynsym
))
5016 goto error_free_vers
;
5018 /* Check the alignment when a common symbol is involved. This
5019 can change when a common symbol is overridden by a normal
5020 definition or a common symbol is ignored due to the old
5021 normal definition. We need to make sure the maximum
5022 alignment is maintained. */
5023 if ((old_alignment
|| common
)
5024 && h
->root
.type
!= bfd_link_hash_common
)
5026 unsigned int common_align
;
5027 unsigned int normal_align
;
5028 unsigned int symbol_align
;
5032 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5033 || h
->root
.type
== bfd_link_hash_defweak
);
5035 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5036 if (h
->root
.u
.def
.section
->owner
!= NULL
5037 && (h
->root
.u
.def
.section
->owner
->flags
5038 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5040 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5041 if (normal_align
> symbol_align
)
5042 normal_align
= symbol_align
;
5045 normal_align
= symbol_align
;
5049 common_align
= old_alignment
;
5050 common_bfd
= old_bfd
;
5055 common_align
= bfd_log2 (isym
->st_value
);
5057 normal_bfd
= old_bfd
;
5060 if (normal_align
< common_align
)
5062 /* PR binutils/2735 */
5063 if (normal_bfd
== NULL
)
5065 /* xgettext:c-format */
5066 (_("warning: alignment %u of common symbol `%s' in %pB is"
5067 " greater than the alignment (%u) of its section %pA"),
5068 1 << common_align
, name
, common_bfd
,
5069 1 << normal_align
, h
->root
.u
.def
.section
);
5072 /* xgettext:c-format */
5073 (_("warning: alignment %u of symbol `%s' in %pB"
5074 " is smaller than %u in %pB"),
5075 1 << normal_align
, name
, normal_bfd
,
5076 1 << common_align
, common_bfd
);
5080 /* Remember the symbol size if it isn't undefined. */
5081 if (isym
->st_size
!= 0
5082 && isym
->st_shndx
!= SHN_UNDEF
5083 && (definition
|| h
->size
== 0))
5086 && h
->size
!= isym
->st_size
5087 && ! size_change_ok
)
5089 /* xgettext:c-format */
5090 (_("warning: size of symbol `%s' changed"
5091 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5092 name
, (uint64_t) h
->size
, old_bfd
,
5093 (uint64_t) isym
->st_size
, abfd
);
5095 h
->size
= isym
->st_size
;
5098 /* If this is a common symbol, then we always want H->SIZE
5099 to be the size of the common symbol. The code just above
5100 won't fix the size if a common symbol becomes larger. We
5101 don't warn about a size change here, because that is
5102 covered by --warn-common. Allow changes between different
5104 if (h
->root
.type
== bfd_link_hash_common
)
5105 h
->size
= h
->root
.u
.c
.size
;
5107 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5108 && ((definition
&& !new_weak
)
5109 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5110 || h
->type
== STT_NOTYPE
))
5112 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5114 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5116 if (type
== STT_GNU_IFUNC
5117 && (abfd
->flags
& DYNAMIC
) != 0)
5120 if (h
->type
!= type
)
5122 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5123 /* xgettext:c-format */
5125 (_("warning: type of symbol `%s' changed"
5126 " from %d to %d in %pB"),
5127 name
, h
->type
, type
, abfd
);
5133 /* Merge st_other field. */
5134 elf_merge_st_other (abfd
, h
, isym
, sec
, definition
, dynamic
);
5136 /* We don't want to make debug symbol dynamic. */
5138 && (sec
->flags
& SEC_DEBUGGING
)
5139 && !bfd_link_relocatable (info
))
5142 /* Nor should we make plugin symbols dynamic. */
5143 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5148 h
->target_internal
= isym
->st_target_internal
;
5149 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5152 if (definition
&& !dynamic
)
5154 char *p
= strchr (name
, ELF_VER_CHR
);
5155 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5157 /* Queue non-default versions so that .symver x, x@FOO
5158 aliases can be checked. */
5161 size_t amt
= ((isymend
- isym
+ 1)
5162 * sizeof (struct elf_link_hash_entry
*));
5164 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5166 goto error_free_vers
;
5168 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5172 if (dynsym
&& h
->dynindx
== -1)
5174 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5175 goto error_free_vers
;
5177 && weakdef (h
)->dynindx
== -1)
5179 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5180 goto error_free_vers
;
5183 else if (h
->dynindx
!= -1)
5184 /* If the symbol already has a dynamic index, but
5185 visibility says it should not be visible, turn it into
5187 switch (ELF_ST_VISIBILITY (h
->other
))
5191 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
5196 /* Don't add DT_NEEDED for references from the dummy bfd nor
5197 for unmatched symbol. */
5202 && h
->ref_regular_nonweak
5204 || (old_bfd
->flags
& BFD_PLUGIN
) == 0))
5205 || (h
->ref_dynamic_nonweak
5206 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5207 && !on_needed_list (elf_dt_name (abfd
),
5208 htab
->needed
, NULL
))))
5210 const char *soname
= elf_dt_name (abfd
);
5212 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5213 h
->root
.root
.string
);
5215 /* A symbol from a library loaded via DT_NEEDED of some
5216 other library is referenced by a regular object.
5217 Add a DT_NEEDED entry for it. Issue an error if
5218 --no-add-needed is used and the reference was not
5221 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5224 /* xgettext:c-format */
5225 (_("%pB: undefined reference to symbol '%s'"),
5227 bfd_set_error (bfd_error_missing_dso
);
5228 goto error_free_vers
;
5231 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5232 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5234 /* Create dynamic sections for backends that require
5235 that be done before setup_gnu_properties. */
5236 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5243 if (info
->lto_plugin_active
5244 && !bfd_link_relocatable (info
)
5245 && (abfd
->flags
& BFD_PLUGIN
) == 0
5251 if (bed
->s
->arch_size
== 32)
5256 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5257 referenced in regular objects so that linker plugin will get
5258 the correct symbol resolution. */
5260 sym_hash
= elf_sym_hashes (abfd
);
5261 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5263 Elf_Internal_Rela
*internal_relocs
;
5264 Elf_Internal_Rela
*rel
, *relend
;
5266 /* Don't check relocations in excluded sections. */
5267 if ((s
->flags
& SEC_RELOC
) == 0
5268 || s
->reloc_count
== 0
5269 || (s
->flags
& SEC_EXCLUDE
) != 0
5270 || ((info
->strip
== strip_all
5271 || info
->strip
== strip_debugger
)
5272 && (s
->flags
& SEC_DEBUGGING
) != 0))
5275 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5278 if (internal_relocs
== NULL
)
5279 goto error_free_vers
;
5281 rel
= internal_relocs
;
5282 relend
= rel
+ s
->reloc_count
;
5283 for ( ; rel
< relend
; rel
++)
5285 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5286 struct elf_link_hash_entry
*h
;
5288 /* Skip local symbols. */
5289 if (r_symndx
< extsymoff
)
5292 h
= sym_hash
[r_symndx
- extsymoff
];
5294 h
->root
.non_ir_ref_regular
= 1;
5297 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5298 free (internal_relocs
);
5302 if (extversym
!= NULL
)
5308 if (isymbuf
!= NULL
)
5314 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5318 /* Restore the symbol table. */
5319 old_ent
= (char *) old_tab
+ tabsize
;
5320 memset (elf_sym_hashes (abfd
), 0,
5321 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5322 htab
->root
.table
.table
= old_table
;
5323 htab
->root
.table
.size
= old_size
;
5324 htab
->root
.table
.count
= old_count
;
5325 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5326 htab
->root
.undefs
= old_undefs
;
5327 htab
->root
.undefs_tail
= old_undefs_tail
;
5328 if (htab
->dynstr
!= NULL
)
5329 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5332 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5334 struct bfd_hash_entry
*p
;
5335 struct elf_link_hash_entry
*h
;
5337 unsigned int alignment_power
;
5338 unsigned int non_ir_ref_dynamic
;
5340 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5342 h
= (struct elf_link_hash_entry
*) p
;
5343 if (h
->root
.type
== bfd_link_hash_warning
)
5344 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5346 /* Preserve the maximum alignment and size for common
5347 symbols even if this dynamic lib isn't on DT_NEEDED
5348 since it can still be loaded at run time by another
5350 if (h
->root
.type
== bfd_link_hash_common
)
5352 size
= h
->root
.u
.c
.size
;
5353 alignment_power
= h
->root
.u
.c
.p
->alignment_power
;
5358 alignment_power
= 0;
5360 /* Preserve non_ir_ref_dynamic so that this symbol
5361 will be exported when the dynamic lib becomes needed
5362 in the second pass. */
5363 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5364 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
5365 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5366 h
= (struct elf_link_hash_entry
*) p
;
5367 if (h
->root
.type
== bfd_link_hash_warning
)
5369 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
5370 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5371 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5373 if (h
->root
.type
== bfd_link_hash_common
)
5375 if (size
> h
->root
.u
.c
.size
)
5376 h
->root
.u
.c
.size
= size
;
5377 if (alignment_power
> h
->root
.u
.c
.p
->alignment_power
)
5378 h
->root
.u
.c
.p
->alignment_power
= alignment_power
;
5380 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5384 /* Make a special call to the linker "notice" function to
5385 tell it that symbols added for crefs may need to be removed. */
5386 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5387 goto error_free_vers
;
5390 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5392 if (nondeflt_vers
!= NULL
)
5393 free (nondeflt_vers
);
5397 if (old_tab
!= NULL
)
5399 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5400 goto error_free_vers
;
5405 /* Now that all the symbols from this input file are created, if
5406 not performing a relocatable link, handle .symver foo, foo@BAR
5407 such that any relocs against foo become foo@BAR. */
5408 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5412 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5414 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5415 char *shortname
, *p
;
5418 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5420 || (h
->root
.type
!= bfd_link_hash_defined
5421 && h
->root
.type
!= bfd_link_hash_defweak
))
5424 amt
= p
- h
->root
.root
.string
;
5425 shortname
= (char *) bfd_malloc (amt
+ 1);
5427 goto error_free_vers
;
5428 memcpy (shortname
, h
->root
.root
.string
, amt
);
5429 shortname
[amt
] = '\0';
5431 hi
= (struct elf_link_hash_entry
*)
5432 bfd_link_hash_lookup (&htab
->root
, shortname
,
5433 FALSE
, FALSE
, FALSE
);
5435 && hi
->root
.type
== h
->root
.type
5436 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5437 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5439 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
5440 hi
->root
.type
= bfd_link_hash_indirect
;
5441 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5442 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5443 sym_hash
= elf_sym_hashes (abfd
);
5445 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5446 if (sym_hash
[symidx
] == hi
)
5448 sym_hash
[symidx
] = h
;
5454 free (nondeflt_vers
);
5455 nondeflt_vers
= NULL
;
5458 /* Now set the alias field correctly for all the weak defined
5459 symbols we found. The only way to do this is to search all the
5460 symbols. Since we only need the information for non functions in
5461 dynamic objects, that's the only time we actually put anything on
5462 the list WEAKS. We need this information so that if a regular
5463 object refers to a symbol defined weakly in a dynamic object, the
5464 real symbol in the dynamic object is also put in the dynamic
5465 symbols; we also must arrange for both symbols to point to the
5466 same memory location. We could handle the general case of symbol
5467 aliasing, but a general symbol alias can only be generated in
5468 assembler code, handling it correctly would be very time
5469 consuming, and other ELF linkers don't handle general aliasing
5473 struct elf_link_hash_entry
**hpp
;
5474 struct elf_link_hash_entry
**hppend
;
5475 struct elf_link_hash_entry
**sorted_sym_hash
;
5476 struct elf_link_hash_entry
*h
;
5477 size_t sym_count
, amt
;
5479 /* Since we have to search the whole symbol list for each weak
5480 defined symbol, search time for N weak defined symbols will be
5481 O(N^2). Binary search will cut it down to O(NlogN). */
5482 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5483 sorted_sym_hash
= bfd_malloc (amt
);
5484 if (sorted_sym_hash
== NULL
)
5486 sym_hash
= sorted_sym_hash
;
5487 hpp
= elf_sym_hashes (abfd
);
5488 hppend
= hpp
+ extsymcount
;
5490 for (; hpp
< hppend
; hpp
++)
5494 && h
->root
.type
== bfd_link_hash_defined
5495 && !bed
->is_function_type (h
->type
))
5503 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5506 while (weaks
!= NULL
)
5508 struct elf_link_hash_entry
*hlook
;
5511 size_t i
, j
, idx
= 0;
5514 weaks
= hlook
->u
.alias
;
5515 hlook
->u
.alias
= NULL
;
5517 if (hlook
->root
.type
!= bfd_link_hash_defined
5518 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5521 slook
= hlook
->root
.u
.def
.section
;
5522 vlook
= hlook
->root
.u
.def
.value
;
5528 bfd_signed_vma vdiff
;
5530 h
= sorted_sym_hash
[idx
];
5531 vdiff
= vlook
- h
->root
.u
.def
.value
;
5538 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5548 /* We didn't find a value/section match. */
5552 /* With multiple aliases, or when the weak symbol is already
5553 strongly defined, we have multiple matching symbols and
5554 the binary search above may land on any of them. Step
5555 one past the matching symbol(s). */
5558 h
= sorted_sym_hash
[idx
];
5559 if (h
->root
.u
.def
.section
!= slook
5560 || h
->root
.u
.def
.value
!= vlook
)
5564 /* Now look back over the aliases. Since we sorted by size
5565 as well as value and section, we'll choose the one with
5566 the largest size. */
5569 h
= sorted_sym_hash
[idx
];
5571 /* Stop if value or section doesn't match. */
5572 if (h
->root
.u
.def
.section
!= slook
5573 || h
->root
.u
.def
.value
!= vlook
)
5575 else if (h
!= hlook
)
5577 struct elf_link_hash_entry
*t
;
5580 hlook
->is_weakalias
= 1;
5582 if (t
->u
.alias
!= NULL
)
5583 while (t
->u
.alias
!= h
)
5587 /* If the weak definition is in the list of dynamic
5588 symbols, make sure the real definition is put
5590 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5592 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5595 free (sorted_sym_hash
);
5600 /* If the real definition is in the list of dynamic
5601 symbols, make sure the weak definition is put
5602 there as well. If we don't do this, then the
5603 dynamic loader might not merge the entries for the
5604 real definition and the weak definition. */
5605 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5607 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5608 goto err_free_sym_hash
;
5615 free (sorted_sym_hash
);
5618 if (bed
->check_directives
5619 && !(*bed
->check_directives
) (abfd
, info
))
5622 /* If this is a non-traditional link, try to optimize the handling
5623 of the .stab/.stabstr sections. */
5625 && ! info
->traditional_format
5626 && is_elf_hash_table (htab
)
5627 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5631 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5632 if (stabstr
!= NULL
)
5634 bfd_size_type string_offset
= 0;
5637 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5638 if (CONST_STRNEQ (stab
->name
, ".stab")
5639 && (!stab
->name
[5] ||
5640 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5641 && (stab
->flags
& SEC_MERGE
) == 0
5642 && !bfd_is_abs_section (stab
->output_section
))
5644 struct bfd_elf_section_data
*secdata
;
5646 secdata
= elf_section_data (stab
);
5647 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5648 stabstr
, &secdata
->sec_info
,
5651 if (secdata
->sec_info
)
5652 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5657 if (dynamic
&& add_needed
)
5659 /* Add this bfd to the loaded list. */
5660 struct elf_link_loaded_list
*n
;
5662 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5666 n
->next
= htab
->dyn_loaded
;
5667 htab
->dyn_loaded
= n
;
5669 if (dynamic
&& !add_needed
5670 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5671 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5676 if (old_tab
!= NULL
)
5678 if (old_strtab
!= NULL
)
5680 if (nondeflt_vers
!= NULL
)
5681 free (nondeflt_vers
);
5682 if (extversym
!= NULL
)
5685 if (isymbuf
!= NULL
)
5691 /* Return the linker hash table entry of a symbol that might be
5692 satisfied by an archive symbol. Return -1 on error. */
5694 struct elf_link_hash_entry
*
5695 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5696 struct bfd_link_info
*info
,
5699 struct elf_link_hash_entry
*h
;
5703 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
5707 /* If this is a default version (the name contains @@), look up the
5708 symbol again with only one `@' as well as without the version.
5709 The effect is that references to the symbol with and without the
5710 version will be matched by the default symbol in the archive. */
5712 p
= strchr (name
, ELF_VER_CHR
);
5713 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5716 /* First check with only one `@'. */
5717 len
= strlen (name
);
5718 copy
= (char *) bfd_alloc (abfd
, len
);
5720 return (struct elf_link_hash_entry
*) -1;
5722 first
= p
- name
+ 1;
5723 memcpy (copy
, name
, first
);
5724 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5726 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
5729 /* We also need to check references to the symbol without the
5731 copy
[first
- 1] = '\0';
5732 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5733 FALSE
, FALSE
, TRUE
);
5736 bfd_release (abfd
, copy
);
5740 /* Add symbols from an ELF archive file to the linker hash table. We
5741 don't use _bfd_generic_link_add_archive_symbols because we need to
5742 handle versioned symbols.
5744 Fortunately, ELF archive handling is simpler than that done by
5745 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5746 oddities. In ELF, if we find a symbol in the archive map, and the
5747 symbol is currently undefined, we know that we must pull in that
5750 Unfortunately, we do have to make multiple passes over the symbol
5751 table until nothing further is resolved. */
5754 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5757 unsigned char *included
= NULL
;
5761 const struct elf_backend_data
*bed
;
5762 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5763 (bfd
*, struct bfd_link_info
*, const char *);
5765 if (! bfd_has_map (abfd
))
5767 /* An empty archive is a special case. */
5768 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5770 bfd_set_error (bfd_error_no_armap
);
5774 /* Keep track of all symbols we know to be already defined, and all
5775 files we know to be already included. This is to speed up the
5776 second and subsequent passes. */
5777 c
= bfd_ardata (abfd
)->symdef_count
;
5780 amt
= c
* sizeof (*included
);
5781 included
= (unsigned char *) bfd_zmalloc (amt
);
5782 if (included
== NULL
)
5785 symdefs
= bfd_ardata (abfd
)->symdefs
;
5786 bed
= get_elf_backend_data (abfd
);
5787 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5800 symdefend
= symdef
+ c
;
5801 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5803 struct elf_link_hash_entry
*h
;
5805 struct bfd_link_hash_entry
*undefs_tail
;
5810 if (symdef
->file_offset
== last
)
5816 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5817 if (h
== (struct elf_link_hash_entry
*) -1)
5823 if (h
->root
.type
== bfd_link_hash_common
)
5825 /* We currently have a common symbol. The archive map contains
5826 a reference to this symbol, so we may want to include it. We
5827 only want to include it however, if this archive element
5828 contains a definition of the symbol, not just another common
5831 Unfortunately some archivers (including GNU ar) will put
5832 declarations of common symbols into their archive maps, as
5833 well as real definitions, so we cannot just go by the archive
5834 map alone. Instead we must read in the element's symbol
5835 table and check that to see what kind of symbol definition
5837 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5840 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5842 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5843 /* Symbol must be defined. Don't check it again. */
5848 /* We need to include this archive member. */
5849 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5850 if (element
== NULL
)
5853 if (! bfd_check_format (element
, bfd_object
))
5856 undefs_tail
= info
->hash
->undefs_tail
;
5858 if (!(*info
->callbacks
5859 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5861 if (!bfd_link_add_symbols (element
, info
))
5864 /* If there are any new undefined symbols, we need to make
5865 another pass through the archive in order to see whether
5866 they can be defined. FIXME: This isn't perfect, because
5867 common symbols wind up on undefs_tail and because an
5868 undefined symbol which is defined later on in this pass
5869 does not require another pass. This isn't a bug, but it
5870 does make the code less efficient than it could be. */
5871 if (undefs_tail
!= info
->hash
->undefs_tail
)
5874 /* Look backward to mark all symbols from this object file
5875 which we have already seen in this pass. */
5879 included
[mark
] = TRUE
;
5884 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5886 /* We mark subsequent symbols from this object file as we go
5887 on through the loop. */
5888 last
= symdef
->file_offset
;
5898 if (included
!= NULL
)
5903 /* Given an ELF BFD, add symbols to the global hash table as
5907 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5909 switch (bfd_get_format (abfd
))
5912 return elf_link_add_object_symbols (abfd
, info
);
5914 return elf_link_add_archive_symbols (abfd
, info
);
5916 bfd_set_error (bfd_error_wrong_format
);
5921 struct hash_codes_info
5923 unsigned long *hashcodes
;
5927 /* This function will be called though elf_link_hash_traverse to store
5928 all hash value of the exported symbols in an array. */
5931 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5933 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5938 /* Ignore indirect symbols. These are added by the versioning code. */
5939 if (h
->dynindx
== -1)
5942 name
= h
->root
.root
.string
;
5943 if (h
->versioned
>= versioned
)
5945 char *p
= strchr (name
, ELF_VER_CHR
);
5948 alc
= (char *) bfd_malloc (p
- name
+ 1);
5954 memcpy (alc
, name
, p
- name
);
5955 alc
[p
- name
] = '\0';
5960 /* Compute the hash value. */
5961 ha
= bfd_elf_hash (name
);
5963 /* Store the found hash value in the array given as the argument. */
5964 *(inf
->hashcodes
)++ = ha
;
5966 /* And store it in the struct so that we can put it in the hash table
5968 h
->u
.elf_hash_value
= ha
;
5976 struct collect_gnu_hash_codes
5979 const struct elf_backend_data
*bed
;
5980 unsigned long int nsyms
;
5981 unsigned long int maskbits
;
5982 unsigned long int *hashcodes
;
5983 unsigned long int *hashval
;
5984 unsigned long int *indx
;
5985 unsigned long int *counts
;
5989 long int min_dynindx
;
5990 unsigned long int bucketcount
;
5991 unsigned long int symindx
;
5992 long int local_indx
;
5993 long int shift1
, shift2
;
5994 unsigned long int mask
;
5998 /* This function will be called though elf_link_hash_traverse to store
5999 all hash value of the exported symbols in an array. */
6002 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6004 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6009 /* Ignore indirect symbols. These are added by the versioning code. */
6010 if (h
->dynindx
== -1)
6013 /* Ignore also local symbols and undefined symbols. */
6014 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6017 name
= h
->root
.root
.string
;
6018 if (h
->versioned
>= versioned
)
6020 char *p
= strchr (name
, ELF_VER_CHR
);
6023 alc
= (char *) bfd_malloc (p
- name
+ 1);
6029 memcpy (alc
, name
, p
- name
);
6030 alc
[p
- name
] = '\0';
6035 /* Compute the hash value. */
6036 ha
= bfd_elf_gnu_hash (name
);
6038 /* Store the found hash value in the array for compute_bucket_count,
6039 and also for .dynsym reordering purposes. */
6040 s
->hashcodes
[s
->nsyms
] = ha
;
6041 s
->hashval
[h
->dynindx
] = ha
;
6043 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6044 s
->min_dynindx
= h
->dynindx
;
6052 /* This function will be called though elf_link_hash_traverse to do
6053 final dynamic symbol renumbering in case of .gnu.hash.
6054 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6055 to the translation table. */
6058 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6060 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6061 unsigned long int bucket
;
6062 unsigned long int val
;
6064 /* Ignore indirect symbols. */
6065 if (h
->dynindx
== -1)
6068 /* Ignore also local symbols and undefined symbols. */
6069 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6071 if (h
->dynindx
>= s
->min_dynindx
)
6073 if (s
->bed
->record_xhash_symbol
!= NULL
)
6075 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6079 h
->dynindx
= s
->local_indx
++;
6084 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6085 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6086 & ((s
->maskbits
>> s
->shift1
) - 1);
6087 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6089 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6090 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6091 if (s
->counts
[bucket
] == 1)
6092 /* Last element terminates the chain. */
6094 bfd_put_32 (s
->output_bfd
, val
,
6095 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6096 --s
->counts
[bucket
];
6097 if (s
->bed
->record_xhash_symbol
!= NULL
)
6099 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6101 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6104 h
->dynindx
= s
->indx
[bucket
]++;
6108 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6111 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6113 return !(h
->forced_local
6114 || h
->root
.type
== bfd_link_hash_undefined
6115 || h
->root
.type
== bfd_link_hash_undefweak
6116 || ((h
->root
.type
== bfd_link_hash_defined
6117 || h
->root
.type
== bfd_link_hash_defweak
)
6118 && h
->root
.u
.def
.section
->output_section
== NULL
));
6121 /* Array used to determine the number of hash table buckets to use
6122 based on the number of symbols there are. If there are fewer than
6123 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6124 fewer than 37 we use 17 buckets, and so forth. We never use more
6125 than 32771 buckets. */
6127 static const size_t elf_buckets
[] =
6129 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6133 /* Compute bucket count for hashing table. We do not use a static set
6134 of possible tables sizes anymore. Instead we determine for all
6135 possible reasonable sizes of the table the outcome (i.e., the
6136 number of collisions etc) and choose the best solution. The
6137 weighting functions are not too simple to allow the table to grow
6138 without bounds. Instead one of the weighting factors is the size.
6139 Therefore the result is always a good payoff between few collisions
6140 (= short chain lengths) and table size. */
6142 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6143 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6144 unsigned long int nsyms
,
6147 size_t best_size
= 0;
6148 unsigned long int i
;
6150 /* We have a problem here. The following code to optimize the table
6151 size requires an integer type with more the 32 bits. If
6152 BFD_HOST_U_64_BIT is set we know about such a type. */
6153 #ifdef BFD_HOST_U_64_BIT
6158 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6159 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6160 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6161 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6162 unsigned long int *counts
;
6164 unsigned int no_improvement_count
= 0;
6166 /* Possible optimization parameters: if we have NSYMS symbols we say
6167 that the hashing table must at least have NSYMS/4 and at most
6169 minsize
= nsyms
/ 4;
6172 best_size
= maxsize
= nsyms
* 2;
6177 if ((best_size
& 31) == 0)
6181 /* Create array where we count the collisions in. We must use bfd_malloc
6182 since the size could be large. */
6184 amt
*= sizeof (unsigned long int);
6185 counts
= (unsigned long int *) bfd_malloc (amt
);
6189 /* Compute the "optimal" size for the hash table. The criteria is a
6190 minimal chain length. The minor criteria is (of course) the size
6192 for (i
= minsize
; i
< maxsize
; ++i
)
6194 /* Walk through the array of hashcodes and count the collisions. */
6195 BFD_HOST_U_64_BIT max
;
6196 unsigned long int j
;
6197 unsigned long int fact
;
6199 if (gnu_hash
&& (i
& 31) == 0)
6202 memset (counts
, '\0', i
* sizeof (unsigned long int));
6204 /* Determine how often each hash bucket is used. */
6205 for (j
= 0; j
< nsyms
; ++j
)
6206 ++counts
[hashcodes
[j
] % i
];
6208 /* For the weight function we need some information about the
6209 pagesize on the target. This is information need not be 100%
6210 accurate. Since this information is not available (so far) we
6211 define it here to a reasonable default value. If it is crucial
6212 to have a better value some day simply define this value. */
6213 # ifndef BFD_TARGET_PAGESIZE
6214 # define BFD_TARGET_PAGESIZE (4096)
6217 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6219 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6222 /* Variant 1: optimize for short chains. We add the squares
6223 of all the chain lengths (which favors many small chain
6224 over a few long chains). */
6225 for (j
= 0; j
< i
; ++j
)
6226 max
+= counts
[j
] * counts
[j
];
6228 /* This adds penalties for the overall size of the table. */
6229 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6232 /* Variant 2: Optimize a lot more for small table. Here we
6233 also add squares of the size but we also add penalties for
6234 empty slots (the +1 term). */
6235 for (j
= 0; j
< i
; ++j
)
6236 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6238 /* The overall size of the table is considered, but not as
6239 strong as in variant 1, where it is squared. */
6240 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6244 /* Compare with current best results. */
6245 if (max
< best_chlen
)
6249 no_improvement_count
= 0;
6251 /* PR 11843: Avoid futile long searches for the best bucket size
6252 when there are a large number of symbols. */
6253 else if (++no_improvement_count
== 100)
6260 #endif /* defined (BFD_HOST_U_64_BIT) */
6262 /* This is the fallback solution if no 64bit type is available or if we
6263 are not supposed to spend much time on optimizations. We select the
6264 bucket count using a fixed set of numbers. */
6265 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6267 best_size
= elf_buckets
[i
];
6268 if (nsyms
< elf_buckets
[i
+ 1])
6271 if (gnu_hash
&& best_size
< 2)
6278 /* Size any SHT_GROUP section for ld -r. */
6281 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6286 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6287 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6288 && (s
= ibfd
->sections
) != NULL
6289 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6290 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6295 /* Set a default stack segment size. The value in INFO wins. If it
6296 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6297 undefined it is initialized. */
6300 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6301 struct bfd_link_info
*info
,
6302 const char *legacy_symbol
,
6303 bfd_vma default_size
)
6305 struct elf_link_hash_entry
*h
= NULL
;
6307 /* Look for legacy symbol. */
6309 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6310 FALSE
, FALSE
, FALSE
);
6311 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6312 || h
->root
.type
== bfd_link_hash_defweak
)
6314 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6316 /* The symbol has no type if specified on the command line. */
6317 h
->type
= STT_OBJECT
;
6318 if (info
->stacksize
)
6319 /* xgettext:c-format */
6320 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6321 output_bfd
, legacy_symbol
);
6322 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6323 /* xgettext:c-format */
6324 _bfd_error_handler (_("%pB: %s not absolute"),
6325 output_bfd
, legacy_symbol
);
6327 info
->stacksize
= h
->root
.u
.def
.value
;
6330 if (!info
->stacksize
)
6331 /* If the user didn't set a size, or explicitly inhibit the
6332 size, set it now. */
6333 info
->stacksize
= default_size
;
6335 /* Provide the legacy symbol, if it is referenced. */
6336 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6337 || h
->root
.type
== bfd_link_hash_undefweak
))
6339 struct bfd_link_hash_entry
*bh
= NULL
;
6341 if (!(_bfd_generic_link_add_one_symbol
6342 (info
, output_bfd
, legacy_symbol
,
6343 BSF_GLOBAL
, bfd_abs_section_ptr
,
6344 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6345 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6348 h
= (struct elf_link_hash_entry
*) bh
;
6350 h
->type
= STT_OBJECT
;
6356 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6358 struct elf_gc_sweep_symbol_info
6360 struct bfd_link_info
*info
;
6361 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6366 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6369 && (((h
->root
.type
== bfd_link_hash_defined
6370 || h
->root
.type
== bfd_link_hash_defweak
)
6371 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6372 && h
->root
.u
.def
.section
->gc_mark
))
6373 || h
->root
.type
== bfd_link_hash_undefined
6374 || h
->root
.type
== bfd_link_hash_undefweak
))
6376 struct elf_gc_sweep_symbol_info
*inf
;
6378 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6379 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
6382 h
->ref_regular_nonweak
= 0;
6388 /* Set up the sizes and contents of the ELF dynamic sections. This is
6389 called by the ELF linker emulation before_allocation routine. We
6390 must set the sizes of the sections before the linker sets the
6391 addresses of the various sections. */
6394 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6397 const char *filter_shlib
,
6399 const char *depaudit
,
6400 const char * const *auxiliary_filters
,
6401 struct bfd_link_info
*info
,
6402 asection
**sinterpptr
)
6405 const struct elf_backend_data
*bed
;
6409 if (!is_elf_hash_table (info
->hash
))
6412 dynobj
= elf_hash_table (info
)->dynobj
;
6414 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6416 struct bfd_elf_version_tree
*verdefs
;
6417 struct elf_info_failed asvinfo
;
6418 struct bfd_elf_version_tree
*t
;
6419 struct bfd_elf_version_expr
*d
;
6423 /* If we are supposed to export all symbols into the dynamic symbol
6424 table (this is not the normal case), then do so. */
6425 if (info
->export_dynamic
6426 || (bfd_link_executable (info
) && info
->dynamic
))
6428 struct elf_info_failed eif
;
6432 elf_link_hash_traverse (elf_hash_table (info
),
6433 _bfd_elf_export_symbol
,
6441 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6443 if (soname_indx
== (size_t) -1
6444 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6448 soname_indx
= (size_t) -1;
6450 /* Make all global versions with definition. */
6451 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6452 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6453 if (!d
->symver
&& d
->literal
)
6455 const char *verstr
, *name
;
6456 size_t namelen
, verlen
, newlen
;
6457 char *newname
, *p
, leading_char
;
6458 struct elf_link_hash_entry
*newh
;
6460 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6462 namelen
= strlen (name
) + (leading_char
!= '\0');
6464 verlen
= strlen (verstr
);
6465 newlen
= namelen
+ verlen
+ 3;
6467 newname
= (char *) bfd_malloc (newlen
);
6468 if (newname
== NULL
)
6470 newname
[0] = leading_char
;
6471 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6473 /* Check the hidden versioned definition. */
6474 p
= newname
+ namelen
;
6476 memcpy (p
, verstr
, verlen
+ 1);
6477 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6478 newname
, FALSE
, FALSE
,
6481 || (newh
->root
.type
!= bfd_link_hash_defined
6482 && newh
->root
.type
!= bfd_link_hash_defweak
))
6484 /* Check the default versioned definition. */
6486 memcpy (p
, verstr
, verlen
+ 1);
6487 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6488 newname
, FALSE
, FALSE
,
6493 /* Mark this version if there is a definition and it is
6494 not defined in a shared object. */
6496 && !newh
->def_dynamic
6497 && (newh
->root
.type
== bfd_link_hash_defined
6498 || newh
->root
.type
== bfd_link_hash_defweak
))
6502 /* Attach all the symbols to their version information. */
6503 asvinfo
.info
= info
;
6504 asvinfo
.failed
= FALSE
;
6506 elf_link_hash_traverse (elf_hash_table (info
),
6507 _bfd_elf_link_assign_sym_version
,
6512 if (!info
->allow_undefined_version
)
6514 /* Check if all global versions have a definition. */
6515 bfd_boolean all_defined
= TRUE
;
6516 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6517 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6518 if (d
->literal
&& !d
->symver
&& !d
->script
)
6521 (_("%s: undefined version: %s"),
6522 d
->pattern
, t
->name
);
6523 all_defined
= FALSE
;
6528 bfd_set_error (bfd_error_bad_value
);
6533 /* Set up the version definition section. */
6534 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6535 BFD_ASSERT (s
!= NULL
);
6537 /* We may have created additional version definitions if we are
6538 just linking a regular application. */
6539 verdefs
= info
->version_info
;
6541 /* Skip anonymous version tag. */
6542 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6543 verdefs
= verdefs
->next
;
6545 if (verdefs
== NULL
&& !info
->create_default_symver
)
6546 s
->flags
|= SEC_EXCLUDE
;
6552 Elf_Internal_Verdef def
;
6553 Elf_Internal_Verdaux defaux
;
6554 struct bfd_link_hash_entry
*bh
;
6555 struct elf_link_hash_entry
*h
;
6561 /* Make space for the base version. */
6562 size
+= sizeof (Elf_External_Verdef
);
6563 size
+= sizeof (Elf_External_Verdaux
);
6566 /* Make space for the default version. */
6567 if (info
->create_default_symver
)
6569 size
+= sizeof (Elf_External_Verdef
);
6573 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6575 struct bfd_elf_version_deps
*n
;
6577 /* Don't emit base version twice. */
6581 size
+= sizeof (Elf_External_Verdef
);
6582 size
+= sizeof (Elf_External_Verdaux
);
6585 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6586 size
+= sizeof (Elf_External_Verdaux
);
6590 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6591 if (s
->contents
== NULL
&& s
->size
!= 0)
6594 /* Fill in the version definition section. */
6598 def
.vd_version
= VER_DEF_CURRENT
;
6599 def
.vd_flags
= VER_FLG_BASE
;
6602 if (info
->create_default_symver
)
6604 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6605 def
.vd_next
= sizeof (Elf_External_Verdef
);
6609 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6610 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6611 + sizeof (Elf_External_Verdaux
));
6614 if (soname_indx
!= (size_t) -1)
6616 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6618 def
.vd_hash
= bfd_elf_hash (soname
);
6619 defaux
.vda_name
= soname_indx
;
6626 name
= lbasename (bfd_get_filename (output_bfd
));
6627 def
.vd_hash
= bfd_elf_hash (name
);
6628 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6630 if (indx
== (size_t) -1)
6632 defaux
.vda_name
= indx
;
6634 defaux
.vda_next
= 0;
6636 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6637 (Elf_External_Verdef
*) p
);
6638 p
+= sizeof (Elf_External_Verdef
);
6639 if (info
->create_default_symver
)
6641 /* Add a symbol representing this version. */
6643 if (! (_bfd_generic_link_add_one_symbol
6644 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6646 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6648 h
= (struct elf_link_hash_entry
*) bh
;
6651 h
->type
= STT_OBJECT
;
6652 h
->verinfo
.vertree
= NULL
;
6654 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6657 /* Create a duplicate of the base version with the same
6658 aux block, but different flags. */
6661 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6663 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6664 + sizeof (Elf_External_Verdaux
));
6667 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6668 (Elf_External_Verdef
*) p
);
6669 p
+= sizeof (Elf_External_Verdef
);
6671 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6672 (Elf_External_Verdaux
*) p
);
6673 p
+= sizeof (Elf_External_Verdaux
);
6675 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6678 struct bfd_elf_version_deps
*n
;
6680 /* Don't emit the base version twice. */
6685 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6688 /* Add a symbol representing this version. */
6690 if (! (_bfd_generic_link_add_one_symbol
6691 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6693 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6695 h
= (struct elf_link_hash_entry
*) bh
;
6698 h
->type
= STT_OBJECT
;
6699 h
->verinfo
.vertree
= t
;
6701 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6704 def
.vd_version
= VER_DEF_CURRENT
;
6706 if (t
->globals
.list
== NULL
6707 && t
->locals
.list
== NULL
6709 def
.vd_flags
|= VER_FLG_WEAK
;
6710 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6711 def
.vd_cnt
= cdeps
+ 1;
6712 def
.vd_hash
= bfd_elf_hash (t
->name
);
6713 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6716 /* If a basever node is next, it *must* be the last node in
6717 the chain, otherwise Verdef construction breaks. */
6718 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6719 BFD_ASSERT (t
->next
->next
== NULL
);
6721 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6722 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6723 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6725 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6726 (Elf_External_Verdef
*) p
);
6727 p
+= sizeof (Elf_External_Verdef
);
6729 defaux
.vda_name
= h
->dynstr_index
;
6730 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6732 defaux
.vda_next
= 0;
6733 if (t
->deps
!= NULL
)
6734 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6735 t
->name_indx
= defaux
.vda_name
;
6737 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6738 (Elf_External_Verdaux
*) p
);
6739 p
+= sizeof (Elf_External_Verdaux
);
6741 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6743 if (n
->version_needed
== NULL
)
6745 /* This can happen if there was an error in the
6747 defaux
.vda_name
= 0;
6751 defaux
.vda_name
= n
->version_needed
->name_indx
;
6752 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6755 if (n
->next
== NULL
)
6756 defaux
.vda_next
= 0;
6758 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6760 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6761 (Elf_External_Verdaux
*) p
);
6762 p
+= sizeof (Elf_External_Verdaux
);
6766 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6770 bed
= get_elf_backend_data (output_bfd
);
6772 if (info
->gc_sections
&& bed
->can_gc_sections
)
6774 struct elf_gc_sweep_symbol_info sweep_info
;
6776 /* Remove the symbols that were in the swept sections from the
6777 dynamic symbol table. */
6778 sweep_info
.info
= info
;
6779 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6780 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6784 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6787 struct elf_find_verdep_info sinfo
;
6789 /* Work out the size of the version reference section. */
6791 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6792 BFD_ASSERT (s
!= NULL
);
6795 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6796 if (sinfo
.vers
== 0)
6798 sinfo
.failed
= FALSE
;
6800 elf_link_hash_traverse (elf_hash_table (info
),
6801 _bfd_elf_link_find_version_dependencies
,
6806 if (elf_tdata (output_bfd
)->verref
== NULL
)
6807 s
->flags
|= SEC_EXCLUDE
;
6810 Elf_Internal_Verneed
*vn
;
6815 /* Build the version dependency section. */
6818 for (vn
= elf_tdata (output_bfd
)->verref
;
6820 vn
= vn
->vn_nextref
)
6822 Elf_Internal_Vernaux
*a
;
6824 size
+= sizeof (Elf_External_Verneed
);
6826 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6827 size
+= sizeof (Elf_External_Vernaux
);
6831 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6832 if (s
->contents
== NULL
)
6836 for (vn
= elf_tdata (output_bfd
)->verref
;
6838 vn
= vn
->vn_nextref
)
6841 Elf_Internal_Vernaux
*a
;
6845 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6848 vn
->vn_version
= VER_NEED_CURRENT
;
6850 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6851 elf_dt_name (vn
->vn_bfd
) != NULL
6852 ? elf_dt_name (vn
->vn_bfd
)
6853 : lbasename (bfd_get_filename
6856 if (indx
== (size_t) -1)
6859 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6860 if (vn
->vn_nextref
== NULL
)
6863 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6864 + caux
* sizeof (Elf_External_Vernaux
));
6866 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6867 (Elf_External_Verneed
*) p
);
6868 p
+= sizeof (Elf_External_Verneed
);
6870 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6872 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6873 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6874 a
->vna_nodename
, FALSE
);
6875 if (indx
== (size_t) -1)
6878 if (a
->vna_nextptr
== NULL
)
6881 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6883 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6884 (Elf_External_Vernaux
*) p
);
6885 p
+= sizeof (Elf_External_Vernaux
);
6889 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6893 /* Any syms created from now on start with -1 in
6894 got.refcount/offset and plt.refcount/offset. */
6895 elf_hash_table (info
)->init_got_refcount
6896 = elf_hash_table (info
)->init_got_offset
;
6897 elf_hash_table (info
)->init_plt_refcount
6898 = elf_hash_table (info
)->init_plt_offset
;
6900 if (bfd_link_relocatable (info
)
6901 && !_bfd_elf_size_group_sections (info
))
6904 /* The backend may have to create some sections regardless of whether
6905 we're dynamic or not. */
6906 if (bed
->elf_backend_always_size_sections
6907 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6910 /* Determine any GNU_STACK segment requirements, after the backend
6911 has had a chance to set a default segment size. */
6912 if (info
->execstack
)
6913 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6914 else if (info
->noexecstack
)
6915 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6919 asection
*notesec
= NULL
;
6922 for (inputobj
= info
->input_bfds
;
6924 inputobj
= inputobj
->link
.next
)
6929 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6931 s
= inputobj
->sections
;
6932 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6935 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6938 if (s
->flags
& SEC_CODE
)
6942 else if (bed
->default_execstack
)
6945 if (notesec
|| info
->stacksize
> 0)
6946 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
6947 if (notesec
&& exec
&& bfd_link_relocatable (info
)
6948 && notesec
->output_section
!= bfd_abs_section_ptr
)
6949 notesec
->output_section
->flags
|= SEC_CODE
;
6952 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6954 struct elf_info_failed eif
;
6955 struct elf_link_hash_entry
*h
;
6959 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
6960 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
6964 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
6966 info
->flags
|= DF_SYMBOLIC
;
6974 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
6976 if (indx
== (size_t) -1)
6979 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
6980 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
6984 if (filter_shlib
!= NULL
)
6988 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6989 filter_shlib
, TRUE
);
6990 if (indx
== (size_t) -1
6991 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
6995 if (auxiliary_filters
!= NULL
)
6997 const char * const *p
;
6999 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
7003 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7005 if (indx
== (size_t) -1
7006 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7015 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7017 if (indx
== (size_t) -1
7018 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7022 if (depaudit
!= NULL
)
7026 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7028 if (indx
== (size_t) -1
7029 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7036 /* Find all symbols which were defined in a dynamic object and make
7037 the backend pick a reasonable value for them. */
7038 elf_link_hash_traverse (elf_hash_table (info
),
7039 _bfd_elf_adjust_dynamic_symbol
,
7044 /* Add some entries to the .dynamic section. We fill in some of the
7045 values later, in bfd_elf_final_link, but we must add the entries
7046 now so that we know the final size of the .dynamic section. */
7048 /* If there are initialization and/or finalization functions to
7049 call then add the corresponding DT_INIT/DT_FINI entries. */
7050 h
= (info
->init_function
7051 ? elf_link_hash_lookup (elf_hash_table (info
),
7052 info
->init_function
, FALSE
,
7059 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7062 h
= (info
->fini_function
7063 ? elf_link_hash_lookup (elf_hash_table (info
),
7064 info
->fini_function
, FALSE
,
7071 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7075 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7076 if (s
!= NULL
&& s
->linker_has_input
)
7078 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7079 if (! bfd_link_executable (info
))
7084 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7085 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7086 && (o
= sub
->sections
) != NULL
7087 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7088 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7089 if (elf_section_data (o
)->this_hdr
.sh_type
7090 == SHT_PREINIT_ARRAY
)
7093 (_("%pB: .preinit_array section is not allowed in DSO"),
7098 bfd_set_error (bfd_error_nonrepresentable_section
);
7102 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7103 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7106 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7107 if (s
!= NULL
&& s
->linker_has_input
)
7109 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7110 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7113 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7114 if (s
!= NULL
&& s
->linker_has_input
)
7116 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7117 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7121 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7122 /* If .dynstr is excluded from the link, we don't want any of
7123 these tags. Strictly, we should be checking each section
7124 individually; This quick check covers for the case where
7125 someone does a /DISCARD/ : { *(*) }. */
7126 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7128 bfd_size_type strsize
;
7130 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7131 if ((info
->emit_hash
7132 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7133 || (info
->emit_gnu_hash
7134 && (bed
->record_xhash_symbol
== NULL
7135 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7136 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7137 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7138 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7139 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7140 bed
->s
->sizeof_sym
))
7145 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7148 /* The backend must work out the sizes of all the other dynamic
7151 && bed
->elf_backend_size_dynamic_sections
!= NULL
7152 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7155 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7157 if (elf_tdata (output_bfd
)->cverdefs
)
7159 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7161 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7162 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7166 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7168 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7171 else if (info
->flags
& DF_BIND_NOW
)
7173 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7179 if (bfd_link_executable (info
))
7180 info
->flags_1
&= ~ (DF_1_INITFIRST
7183 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7187 if (elf_tdata (output_bfd
)->cverrefs
)
7189 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7191 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7192 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7196 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7197 && elf_tdata (output_bfd
)->cverdefs
== 0)
7198 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7202 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7203 s
->flags
|= SEC_EXCLUDE
;
7209 /* Find the first non-excluded output section. We'll use its
7210 section symbol for some emitted relocs. */
7212 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7215 asection
*found
= NULL
;
7217 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7218 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7219 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7222 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7225 elf_hash_table (info
)->text_index_section
= found
;
7228 /* Find two non-excluded output sections, one for code, one for data.
7229 We'll use their section symbols for some emitted relocs. */
7231 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7234 asection
*found
= NULL
;
7236 /* Data first, since setting text_index_section changes
7237 _bfd_elf_omit_section_dynsym_default. */
7238 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7239 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7240 && !(s
->flags
& SEC_READONLY
)
7241 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7244 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7247 elf_hash_table (info
)->data_index_section
= found
;
7249 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7250 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7251 && (s
->flags
& SEC_READONLY
)
7252 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7257 elf_hash_table (info
)->text_index_section
= found
;
7260 #define GNU_HASH_SECTION_NAME(bed) \
7261 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7264 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7266 const struct elf_backend_data
*bed
;
7267 unsigned long section_sym_count
;
7268 bfd_size_type dynsymcount
= 0;
7270 if (!is_elf_hash_table (info
->hash
))
7273 bed
= get_elf_backend_data (output_bfd
);
7274 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7276 /* Assign dynsym indices. In a shared library we generate a section
7277 symbol for each output section, which come first. Next come all
7278 of the back-end allocated local dynamic syms, followed by the rest
7279 of the global symbols.
7281 This is usually not needed for static binaries, however backends
7282 can request to always do it, e.g. the MIPS backend uses dynamic
7283 symbol counts to lay out GOT, which will be produced in the
7284 presence of GOT relocations even in static binaries (holding fixed
7285 data in that case, to satisfy those relocations). */
7287 if (elf_hash_table (info
)->dynamic_sections_created
7288 || bed
->always_renumber_dynsyms
)
7289 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7290 §ion_sym_count
);
7292 if (elf_hash_table (info
)->dynamic_sections_created
)
7296 unsigned int dtagcount
;
7298 dynobj
= elf_hash_table (info
)->dynobj
;
7300 /* Work out the size of the symbol version section. */
7301 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7302 BFD_ASSERT (s
!= NULL
);
7303 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7305 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7306 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7307 if (s
->contents
== NULL
)
7310 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7314 /* Set the size of the .dynsym and .hash sections. We counted
7315 the number of dynamic symbols in elf_link_add_object_symbols.
7316 We will build the contents of .dynsym and .hash when we build
7317 the final symbol table, because until then we do not know the
7318 correct value to give the symbols. We built the .dynstr
7319 section as we went along in elf_link_add_object_symbols. */
7320 s
= elf_hash_table (info
)->dynsym
;
7321 BFD_ASSERT (s
!= NULL
);
7322 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7324 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7325 if (s
->contents
== NULL
)
7328 /* The first entry in .dynsym is a dummy symbol. Clear all the
7329 section syms, in case we don't output them all. */
7330 ++section_sym_count
;
7331 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7333 elf_hash_table (info
)->bucketcount
= 0;
7335 /* Compute the size of the hashing table. As a side effect this
7336 computes the hash values for all the names we export. */
7337 if (info
->emit_hash
)
7339 unsigned long int *hashcodes
;
7340 struct hash_codes_info hashinf
;
7342 unsigned long int nsyms
;
7344 size_t hash_entry_size
;
7346 /* Compute the hash values for all exported symbols. At the same
7347 time store the values in an array so that we could use them for
7349 amt
= dynsymcount
* sizeof (unsigned long int);
7350 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7351 if (hashcodes
== NULL
)
7353 hashinf
.hashcodes
= hashcodes
;
7354 hashinf
.error
= FALSE
;
7356 /* Put all hash values in HASHCODES. */
7357 elf_link_hash_traverse (elf_hash_table (info
),
7358 elf_collect_hash_codes
, &hashinf
);
7365 nsyms
= hashinf
.hashcodes
- hashcodes
;
7367 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7370 if (bucketcount
== 0 && nsyms
> 0)
7373 elf_hash_table (info
)->bucketcount
= bucketcount
;
7375 s
= bfd_get_linker_section (dynobj
, ".hash");
7376 BFD_ASSERT (s
!= NULL
);
7377 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7378 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7379 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7380 if (s
->contents
== NULL
)
7383 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7384 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7385 s
->contents
+ hash_entry_size
);
7388 if (info
->emit_gnu_hash
)
7391 unsigned char *contents
;
7392 struct collect_gnu_hash_codes cinfo
;
7396 memset (&cinfo
, 0, sizeof (cinfo
));
7398 /* Compute the hash values for all exported symbols. At the same
7399 time store the values in an array so that we could use them for
7401 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7402 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7403 if (cinfo
.hashcodes
== NULL
)
7406 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7407 cinfo
.min_dynindx
= -1;
7408 cinfo
.output_bfd
= output_bfd
;
7411 /* Put all hash values in HASHCODES. */
7412 elf_link_hash_traverse (elf_hash_table (info
),
7413 elf_collect_gnu_hash_codes
, &cinfo
);
7416 free (cinfo
.hashcodes
);
7421 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7423 if (bucketcount
== 0)
7425 free (cinfo
.hashcodes
);
7429 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7430 BFD_ASSERT (s
!= NULL
);
7432 if (cinfo
.nsyms
== 0)
7434 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7435 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7436 free (cinfo
.hashcodes
);
7437 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7438 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7439 if (contents
== NULL
)
7441 s
->contents
= contents
;
7442 /* 1 empty bucket. */
7443 bfd_put_32 (output_bfd
, 1, contents
);
7444 /* SYMIDX above the special symbol 0. */
7445 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7446 /* Just one word for bitmask. */
7447 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7448 /* Only hash fn bloom filter. */
7449 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7450 /* No hashes are valid - empty bitmask. */
7451 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7452 /* No hashes in the only bucket. */
7453 bfd_put_32 (output_bfd
, 0,
7454 contents
+ 16 + bed
->s
->arch_size
/ 8);
7458 unsigned long int maskwords
, maskbitslog2
, x
;
7459 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7463 while ((x
>>= 1) != 0)
7465 if (maskbitslog2
< 3)
7467 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7468 maskbitslog2
= maskbitslog2
+ 3;
7470 maskbitslog2
= maskbitslog2
+ 2;
7471 if (bed
->s
->arch_size
== 64)
7473 if (maskbitslog2
== 5)
7479 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7480 cinfo
.shift2
= maskbitslog2
;
7481 cinfo
.maskbits
= 1 << maskbitslog2
;
7482 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7483 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7484 amt
+= maskwords
* sizeof (bfd_vma
);
7485 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7486 if (cinfo
.bitmask
== NULL
)
7488 free (cinfo
.hashcodes
);
7492 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7493 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7494 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7495 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7497 /* Determine how often each hash bucket is used. */
7498 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7499 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7500 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7502 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7503 if (cinfo
.counts
[i
] != 0)
7505 cinfo
.indx
[i
] = cnt
;
7506 cnt
+= cinfo
.counts
[i
];
7508 BFD_ASSERT (cnt
== dynsymcount
);
7509 cinfo
.bucketcount
= bucketcount
;
7510 cinfo
.local_indx
= cinfo
.min_dynindx
;
7512 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7513 s
->size
+= cinfo
.maskbits
/ 8;
7514 if (bed
->record_xhash_symbol
!= NULL
)
7515 s
->size
+= cinfo
.nsyms
* 4;
7516 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7517 if (contents
== NULL
)
7519 free (cinfo
.bitmask
);
7520 free (cinfo
.hashcodes
);
7524 s
->contents
= contents
;
7525 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7526 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7527 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7528 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7529 contents
+= 16 + cinfo
.maskbits
/ 8;
7531 for (i
= 0; i
< bucketcount
; ++i
)
7533 if (cinfo
.counts
[i
] == 0)
7534 bfd_put_32 (output_bfd
, 0, contents
);
7536 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7540 cinfo
.contents
= contents
;
7542 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7543 /* Renumber dynamic symbols, if populating .gnu.hash section.
7544 If using .MIPS.xhash, populate the translation table. */
7545 elf_link_hash_traverse (elf_hash_table (info
),
7546 elf_gnu_hash_process_symidx
, &cinfo
);
7548 contents
= s
->contents
+ 16;
7549 for (i
= 0; i
< maskwords
; ++i
)
7551 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7553 contents
+= bed
->s
->arch_size
/ 8;
7556 free (cinfo
.bitmask
);
7557 free (cinfo
.hashcodes
);
7561 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7562 BFD_ASSERT (s
!= NULL
);
7564 elf_finalize_dynstr (output_bfd
, info
);
7566 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7568 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7569 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7576 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7579 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7582 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7583 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7586 /* Finish SHF_MERGE section merging. */
7589 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7594 if (!is_elf_hash_table (info
->hash
))
7597 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7598 if ((ibfd
->flags
& DYNAMIC
) == 0
7599 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7600 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7601 == get_elf_backend_data (obfd
)->s
->elfclass
))
7602 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7603 if ((sec
->flags
& SEC_MERGE
) != 0
7604 && !bfd_is_abs_section (sec
->output_section
))
7606 struct bfd_elf_section_data
*secdata
;
7608 secdata
= elf_section_data (sec
);
7609 if (! _bfd_add_merge_section (obfd
,
7610 &elf_hash_table (info
)->merge_info
,
7611 sec
, &secdata
->sec_info
))
7613 else if (secdata
->sec_info
)
7614 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7617 if (elf_hash_table (info
)->merge_info
!= NULL
)
7618 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7619 merge_sections_remove_hook
);
7623 /* Create an entry in an ELF linker hash table. */
7625 struct bfd_hash_entry
*
7626 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7627 struct bfd_hash_table
*table
,
7630 /* Allocate the structure if it has not already been allocated by a
7634 entry
= (struct bfd_hash_entry
*)
7635 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7640 /* Call the allocation method of the superclass. */
7641 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7644 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7645 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7647 /* Set local fields. */
7650 ret
->got
= htab
->init_got_refcount
;
7651 ret
->plt
= htab
->init_plt_refcount
;
7652 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7653 - offsetof (struct elf_link_hash_entry
, size
)));
7654 /* Assume that we have been called by a non-ELF symbol reader.
7655 This flag is then reset by the code which reads an ELF input
7656 file. This ensures that a symbol created by a non-ELF symbol
7657 reader will have the flag set correctly. */
7664 /* Copy data from an indirect symbol to its direct symbol, hiding the
7665 old indirect symbol. Also used for copying flags to a weakdef. */
7668 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7669 struct elf_link_hash_entry
*dir
,
7670 struct elf_link_hash_entry
*ind
)
7672 struct elf_link_hash_table
*htab
;
7674 /* Copy down any references that we may have already seen to the
7675 symbol which just became indirect. */
7677 if (dir
->versioned
!= versioned_hidden
)
7678 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7679 dir
->ref_regular
|= ind
->ref_regular
;
7680 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7681 dir
->non_got_ref
|= ind
->non_got_ref
;
7682 dir
->needs_plt
|= ind
->needs_plt
;
7683 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7685 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7688 /* Copy over the global and procedure linkage table refcount entries.
7689 These may have been already set up by a check_relocs routine. */
7690 htab
= elf_hash_table (info
);
7691 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7693 if (dir
->got
.refcount
< 0)
7694 dir
->got
.refcount
= 0;
7695 dir
->got
.refcount
+= ind
->got
.refcount
;
7696 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7699 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7701 if (dir
->plt
.refcount
< 0)
7702 dir
->plt
.refcount
= 0;
7703 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7704 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7707 if (ind
->dynindx
!= -1)
7709 if (dir
->dynindx
!= -1)
7710 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7711 dir
->dynindx
= ind
->dynindx
;
7712 dir
->dynstr_index
= ind
->dynstr_index
;
7714 ind
->dynstr_index
= 0;
7719 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7720 struct elf_link_hash_entry
*h
,
7721 bfd_boolean force_local
)
7723 /* STT_GNU_IFUNC symbol must go through PLT. */
7724 if (h
->type
!= STT_GNU_IFUNC
)
7726 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7731 h
->forced_local
= 1;
7732 if (h
->dynindx
!= -1)
7734 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7737 h
->dynstr_index
= 0;
7742 /* Hide a symbol. */
7745 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7746 struct bfd_link_info
*info
,
7747 struct bfd_link_hash_entry
*h
)
7749 if (is_elf_hash_table (info
->hash
))
7751 const struct elf_backend_data
*bed
7752 = get_elf_backend_data (output_bfd
);
7753 struct elf_link_hash_entry
*eh
7754 = (struct elf_link_hash_entry
*) h
;
7755 bed
->elf_backend_hide_symbol (info
, eh
, TRUE
);
7756 eh
->def_dynamic
= 0;
7757 eh
->ref_dynamic
= 0;
7758 eh
->dynamic_def
= 0;
7762 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7766 _bfd_elf_link_hash_table_init
7767 (struct elf_link_hash_table
*table
,
7769 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7770 struct bfd_hash_table
*,
7772 unsigned int entsize
,
7773 enum elf_target_id target_id
)
7776 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7778 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7779 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7780 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7781 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7782 /* The first dynamic symbol is a dummy. */
7783 table
->dynsymcount
= 1;
7785 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7787 table
->root
.type
= bfd_link_elf_hash_table
;
7788 table
->hash_table_id
= target_id
;
7793 /* Create an ELF linker hash table. */
7795 struct bfd_link_hash_table
*
7796 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7798 struct elf_link_hash_table
*ret
;
7799 size_t amt
= sizeof (struct elf_link_hash_table
);
7801 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7805 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7806 sizeof (struct elf_link_hash_entry
),
7812 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7817 /* Destroy an ELF linker hash table. */
7820 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7822 struct elf_link_hash_table
*htab
;
7824 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7825 if (htab
->dynstr
!= NULL
)
7826 _bfd_elf_strtab_free (htab
->dynstr
);
7827 _bfd_merge_sections_free (htab
->merge_info
);
7828 _bfd_generic_link_hash_table_free (obfd
);
7831 /* This is a hook for the ELF emulation code in the generic linker to
7832 tell the backend linker what file name to use for the DT_NEEDED
7833 entry for a dynamic object. */
7836 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7838 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7839 && bfd_get_format (abfd
) == bfd_object
)
7840 elf_dt_name (abfd
) = name
;
7844 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7847 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7848 && bfd_get_format (abfd
) == bfd_object
)
7849 lib_class
= elf_dyn_lib_class (abfd
);
7856 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7858 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7859 && bfd_get_format (abfd
) == bfd_object
)
7860 elf_dyn_lib_class (abfd
) = lib_class
;
7863 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7864 the linker ELF emulation code. */
7866 struct bfd_link_needed_list
*
7867 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7868 struct bfd_link_info
*info
)
7870 if (! is_elf_hash_table (info
->hash
))
7872 return elf_hash_table (info
)->needed
;
7875 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7876 hook for the linker ELF emulation code. */
7878 struct bfd_link_needed_list
*
7879 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7880 struct bfd_link_info
*info
)
7882 if (! is_elf_hash_table (info
->hash
))
7884 return elf_hash_table (info
)->runpath
;
7887 /* Get the name actually used for a dynamic object for a link. This
7888 is the SONAME entry if there is one. Otherwise, it is the string
7889 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7892 bfd_elf_get_dt_soname (bfd
*abfd
)
7894 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7895 && bfd_get_format (abfd
) == bfd_object
)
7896 return elf_dt_name (abfd
);
7900 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7901 the ELF linker emulation code. */
7904 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7905 struct bfd_link_needed_list
**pneeded
)
7908 bfd_byte
*dynbuf
= NULL
;
7909 unsigned int elfsec
;
7910 unsigned long shlink
;
7911 bfd_byte
*extdyn
, *extdynend
;
7913 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
7917 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
7918 || bfd_get_format (abfd
) != bfd_object
)
7921 s
= bfd_get_section_by_name (abfd
, ".dynamic");
7922 if (s
== NULL
|| s
->size
== 0)
7925 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
7928 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
7929 if (elfsec
== SHN_BAD
)
7932 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
7934 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
7935 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
7938 extdynend
= extdyn
+ s
->size
;
7939 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
7941 Elf_Internal_Dyn dyn
;
7943 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
7945 if (dyn
.d_tag
== DT_NULL
)
7948 if (dyn
.d_tag
== DT_NEEDED
)
7951 struct bfd_link_needed_list
*l
;
7952 unsigned int tagv
= dyn
.d_un
.d_val
;
7955 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
7960 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7981 struct elf_symbuf_symbol
7983 unsigned long st_name
; /* Symbol name, index in string tbl */
7984 unsigned char st_info
; /* Type and binding attributes */
7985 unsigned char st_other
; /* Visibilty, and target specific */
7988 struct elf_symbuf_head
7990 struct elf_symbuf_symbol
*ssym
;
7992 unsigned int st_shndx
;
7999 Elf_Internal_Sym
*isym
;
8000 struct elf_symbuf_symbol
*ssym
;
8006 /* Sort references to symbols by ascending section number. */
8009 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8011 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8012 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8014 if (s1
->st_shndx
!= s2
->st_shndx
)
8015 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8016 /* Final sort by the address of the sym in the symbuf ensures
8019 return s1
> s2
? 1 : -1;
8024 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8026 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8027 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8028 int ret
= strcmp (s1
->name
, s2
->name
);
8031 if (s1
->u
.p
!= s2
->u
.p
)
8032 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8036 static struct elf_symbuf_head
*
8037 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8039 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8040 struct elf_symbuf_symbol
*ssym
;
8041 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8042 size_t i
, shndx_count
, total_size
, amt
;
8044 amt
= symcount
* sizeof (*indbuf
);
8045 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8049 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8050 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
8051 *ind
++ = &isymbuf
[i
];
8054 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8055 elf_sort_elf_symbol
);
8058 if (indbufend
> indbuf
)
8059 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8060 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8063 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8064 + (indbufend
- indbuf
) * sizeof (*ssym
));
8065 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8066 if (ssymbuf
== NULL
)
8072 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8073 ssymbuf
->ssym
= NULL
;
8074 ssymbuf
->count
= shndx_count
;
8075 ssymbuf
->st_shndx
= 0;
8076 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8078 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8081 ssymhead
->ssym
= ssym
;
8082 ssymhead
->count
= 0;
8083 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8085 ssym
->st_name
= (*ind
)->st_name
;
8086 ssym
->st_info
= (*ind
)->st_info
;
8087 ssym
->st_other
= (*ind
)->st_other
;
8090 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8091 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
8098 /* Check if 2 sections define the same set of local and global
8102 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8103 struct bfd_link_info
*info
)
8106 const struct elf_backend_data
*bed1
, *bed2
;
8107 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8108 size_t symcount1
, symcount2
;
8109 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8110 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8111 Elf_Internal_Sym
*isym
, *isymend
;
8112 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8113 size_t count1
, count2
, i
;
8114 unsigned int shndx1
, shndx2
;
8120 /* Both sections have to be in ELF. */
8121 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8122 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8125 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8128 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8129 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8130 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8133 bed1
= get_elf_backend_data (bfd1
);
8134 bed2
= get_elf_backend_data (bfd2
);
8135 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8136 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8137 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8138 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8140 if (symcount1
== 0 || symcount2
== 0)
8146 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8147 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8149 if (ssymbuf1
== NULL
)
8151 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8153 if (isymbuf1
== NULL
)
8156 if (!info
->reduce_memory_overheads
)
8158 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8159 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8163 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8165 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8167 if (isymbuf2
== NULL
)
8170 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
8172 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8173 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8177 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8179 /* Optimized faster version. */
8181 struct elf_symbol
*symp
;
8182 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8185 hi
= ssymbuf1
->count
;
8190 mid
= (lo
+ hi
) / 2;
8191 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8193 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8197 count1
= ssymbuf1
[mid
].count
;
8204 hi
= ssymbuf2
->count
;
8209 mid
= (lo
+ hi
) / 2;
8210 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8212 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8216 count2
= ssymbuf2
[mid
].count
;
8222 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8226 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8228 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8229 if (symtable1
== NULL
|| symtable2
== NULL
)
8233 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
8234 ssym
< ssymend
; ssym
++, symp
++)
8236 symp
->u
.ssym
= ssym
;
8237 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8243 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
8244 ssym
< ssymend
; ssym
++, symp
++)
8246 symp
->u
.ssym
= ssym
;
8247 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8252 /* Sort symbol by name. */
8253 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8254 elf_sym_name_compare
);
8255 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8256 elf_sym_name_compare
);
8258 for (i
= 0; i
< count1
; i
++)
8259 /* Two symbols must have the same binding, type and name. */
8260 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8261 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8262 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8269 symtable1
= (struct elf_symbol
*)
8270 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8271 symtable2
= (struct elf_symbol
*)
8272 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8273 if (symtable1
== NULL
|| symtable2
== NULL
)
8276 /* Count definitions in the section. */
8278 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8279 if (isym
->st_shndx
== shndx1
)
8280 symtable1
[count1
++].u
.isym
= isym
;
8283 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8284 if (isym
->st_shndx
== shndx2
)
8285 symtable2
[count2
++].u
.isym
= isym
;
8287 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8290 for (i
= 0; i
< count1
; i
++)
8292 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8293 symtable1
[i
].u
.isym
->st_name
);
8295 for (i
= 0; i
< count2
; i
++)
8297 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8298 symtable2
[i
].u
.isym
->st_name
);
8300 /* Sort symbol by name. */
8301 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8302 elf_sym_name_compare
);
8303 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8304 elf_sym_name_compare
);
8306 for (i
= 0; i
< count1
; i
++)
8307 /* Two symbols must have the same binding, type and name. */
8308 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8309 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8310 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8328 /* Return TRUE if 2 section types are compatible. */
8331 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8332 bfd
*bbfd
, const asection
*bsec
)
8336 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8337 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8340 return elf_section_type (asec
) == elf_section_type (bsec
);
8343 /* Final phase of ELF linker. */
8345 /* A structure we use to avoid passing large numbers of arguments. */
8347 struct elf_final_link_info
8349 /* General link information. */
8350 struct bfd_link_info
*info
;
8353 /* Symbol string table. */
8354 struct elf_strtab_hash
*symstrtab
;
8355 /* .hash section. */
8357 /* symbol version section (.gnu.version). */
8358 asection
*symver_sec
;
8359 /* Buffer large enough to hold contents of any section. */
8361 /* Buffer large enough to hold external relocs of any section. */
8362 void *external_relocs
;
8363 /* Buffer large enough to hold internal relocs of any section. */
8364 Elf_Internal_Rela
*internal_relocs
;
8365 /* Buffer large enough to hold external local symbols of any input
8367 bfd_byte
*external_syms
;
8368 /* And a buffer for symbol section indices. */
8369 Elf_External_Sym_Shndx
*locsym_shndx
;
8370 /* Buffer large enough to hold internal local symbols of any input
8372 Elf_Internal_Sym
*internal_syms
;
8373 /* Array large enough to hold a symbol index for each local symbol
8374 of any input BFD. */
8376 /* Array large enough to hold a section pointer for each local
8377 symbol of any input BFD. */
8378 asection
**sections
;
8379 /* Buffer for SHT_SYMTAB_SHNDX section. */
8380 Elf_External_Sym_Shndx
*symshndxbuf
;
8381 /* Number of STT_FILE syms seen. */
8382 size_t filesym_count
;
8385 /* This struct is used to pass information to elf_link_output_extsym. */
8387 struct elf_outext_info
8390 bfd_boolean localsyms
;
8391 bfd_boolean file_sym_done
;
8392 struct elf_final_link_info
*flinfo
;
8396 /* Support for evaluating a complex relocation.
8398 Complex relocations are generalized, self-describing relocations. The
8399 implementation of them consists of two parts: complex symbols, and the
8400 relocations themselves.
8402 The relocations are use a reserved elf-wide relocation type code (R_RELC
8403 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8404 information (start bit, end bit, word width, etc) into the addend. This
8405 information is extracted from CGEN-generated operand tables within gas.
8407 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
8408 internal) representing prefix-notation expressions, including but not
8409 limited to those sorts of expressions normally encoded as addends in the
8410 addend field. The symbol mangling format is:
8413 | <unary-operator> ':' <node>
8414 | <binary-operator> ':' <node> ':' <node>
8417 <literal> := 's' <digits=N> ':' <N character symbol name>
8418 | 'S' <digits=N> ':' <N character section name>
8422 <binary-operator> := as in C
8423 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8426 set_symbol_value (bfd
*bfd_with_globals
,
8427 Elf_Internal_Sym
*isymbuf
,
8432 struct elf_link_hash_entry
**sym_hashes
;
8433 struct elf_link_hash_entry
*h
;
8434 size_t extsymoff
= locsymcount
;
8436 if (symidx
< locsymcount
)
8438 Elf_Internal_Sym
*sym
;
8440 sym
= isymbuf
+ symidx
;
8441 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8443 /* It is a local symbol: move it to the
8444 "absolute" section and give it a value. */
8445 sym
->st_shndx
= SHN_ABS
;
8446 sym
->st_value
= val
;
8449 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8453 /* It is a global symbol: set its link type
8454 to "defined" and give it a value. */
8456 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8457 h
= sym_hashes
[symidx
- extsymoff
];
8458 while (h
->root
.type
== bfd_link_hash_indirect
8459 || h
->root
.type
== bfd_link_hash_warning
)
8460 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8461 h
->root
.type
= bfd_link_hash_defined
;
8462 h
->root
.u
.def
.value
= val
;
8463 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8467 resolve_symbol (const char *name
,
8469 struct elf_final_link_info
*flinfo
,
8471 Elf_Internal_Sym
*isymbuf
,
8474 Elf_Internal_Sym
*sym
;
8475 struct bfd_link_hash_entry
*global_entry
;
8476 const char *candidate
= NULL
;
8477 Elf_Internal_Shdr
*symtab_hdr
;
8480 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8482 for (i
= 0; i
< locsymcount
; ++ i
)
8486 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8489 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8490 symtab_hdr
->sh_link
,
8493 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8494 name
, candidate
, (unsigned long) sym
->st_value
);
8496 if (candidate
&& strcmp (candidate
, name
) == 0)
8498 asection
*sec
= flinfo
->sections
[i
];
8500 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8501 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8503 printf ("Found symbol with value %8.8lx\n",
8504 (unsigned long) *result
);
8510 /* Hmm, haven't found it yet. perhaps it is a global. */
8511 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8512 FALSE
, FALSE
, TRUE
);
8516 if (global_entry
->type
== bfd_link_hash_defined
8517 || global_entry
->type
== bfd_link_hash_defweak
)
8519 *result
= (global_entry
->u
.def
.value
8520 + global_entry
->u
.def
.section
->output_section
->vma
8521 + global_entry
->u
.def
.section
->output_offset
);
8523 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8524 global_entry
->root
.string
, (unsigned long) *result
);
8532 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8533 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8534 names like "foo.end" which is the end address of section "foo". */
8537 resolve_section (const char *name
,
8545 for (curr
= sections
; curr
; curr
= curr
->next
)
8546 if (strcmp (curr
->name
, name
) == 0)
8548 *result
= curr
->vma
;
8552 /* Hmm. still haven't found it. try pseudo-section names. */
8553 /* FIXME: This could be coded more efficiently... */
8554 for (curr
= sections
; curr
; curr
= curr
->next
)
8556 len
= strlen (curr
->name
);
8557 if (len
> strlen (name
))
8560 if (strncmp (curr
->name
, name
, len
) == 0)
8562 if (strncmp (".end", name
+ len
, 4) == 0)
8564 *result
= (curr
->vma
8565 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8569 /* Insert more pseudo-section names here, if you like. */
8577 undefined_reference (const char *reftype
, const char *name
)
8579 /* xgettext:c-format */
8580 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8585 eval_symbol (bfd_vma
*result
,
8588 struct elf_final_link_info
*flinfo
,
8590 Elf_Internal_Sym
*isymbuf
,
8599 const char *sym
= *symp
;
8601 bfd_boolean symbol_is_section
= FALSE
;
8606 if (len
< 1 || len
> sizeof (symbuf
))
8608 bfd_set_error (bfd_error_invalid_operation
);
8621 *result
= strtoul (sym
, (char **) symp
, 16);
8625 symbol_is_section
= TRUE
;
8629 symlen
= strtol (sym
, (char **) symp
, 10);
8630 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8632 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8634 bfd_set_error (bfd_error_invalid_operation
);
8638 memcpy (symbuf
, sym
, symlen
);
8639 symbuf
[symlen
] = '\0';
8640 *symp
= sym
+ symlen
;
8642 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8643 the symbol as a section, or vice-versa. so we're pretty liberal in our
8644 interpretation here; section means "try section first", not "must be a
8645 section", and likewise with symbol. */
8647 if (symbol_is_section
)
8649 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8650 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8651 isymbuf
, locsymcount
))
8653 undefined_reference ("section", symbuf
);
8659 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8660 isymbuf
, locsymcount
)
8661 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8664 undefined_reference ("symbol", symbuf
);
8671 /* All that remains are operators. */
8673 #define UNARY_OP(op) \
8674 if (strncmp (sym, #op, strlen (#op)) == 0) \
8676 sym += strlen (#op); \
8680 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8681 isymbuf, locsymcount, signed_p)) \
8684 *result = op ((bfd_signed_vma) a); \
8690 #define BINARY_OP(op) \
8691 if (strncmp (sym, #op, strlen (#op)) == 0) \
8693 sym += strlen (#op); \
8697 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8698 isymbuf, locsymcount, signed_p)) \
8701 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8702 isymbuf, locsymcount, signed_p)) \
8705 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8735 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8736 bfd_set_error (bfd_error_invalid_operation
);
8742 put_value (bfd_vma size
,
8743 unsigned long chunksz
,
8748 location
+= (size
- chunksz
);
8750 for (; size
; size
-= chunksz
, location
-= chunksz
)
8755 bfd_put_8 (input_bfd
, x
, location
);
8759 bfd_put_16 (input_bfd
, x
, location
);
8763 bfd_put_32 (input_bfd
, x
, location
);
8764 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8770 bfd_put_64 (input_bfd
, x
, location
);
8771 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8784 get_value (bfd_vma size
,
8785 unsigned long chunksz
,
8792 /* Sanity checks. */
8793 BFD_ASSERT (chunksz
<= sizeof (x
)
8796 && (size
% chunksz
) == 0
8797 && input_bfd
!= NULL
8798 && location
!= NULL
);
8800 if (chunksz
== sizeof (x
))
8802 BFD_ASSERT (size
== chunksz
);
8804 /* Make sure that we do not perform an undefined shift operation.
8805 We know that size == chunksz so there will only be one iteration
8806 of the loop below. */
8810 shift
= 8 * chunksz
;
8812 for (; size
; size
-= chunksz
, location
+= chunksz
)
8817 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
8820 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
8823 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
8827 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
8838 decode_complex_addend (unsigned long *start
, /* in bits */
8839 unsigned long *oplen
, /* in bits */
8840 unsigned long *len
, /* in bits */
8841 unsigned long *wordsz
, /* in bytes */
8842 unsigned long *chunksz
, /* in bytes */
8843 unsigned long *lsb0_p
,
8844 unsigned long *signed_p
,
8845 unsigned long *trunc_p
,
8846 unsigned long encoded
)
8848 * start
= encoded
& 0x3F;
8849 * len
= (encoded
>> 6) & 0x3F;
8850 * oplen
= (encoded
>> 12) & 0x3F;
8851 * wordsz
= (encoded
>> 18) & 0xF;
8852 * chunksz
= (encoded
>> 22) & 0xF;
8853 * lsb0_p
= (encoded
>> 27) & 1;
8854 * signed_p
= (encoded
>> 28) & 1;
8855 * trunc_p
= (encoded
>> 29) & 1;
8858 bfd_reloc_status_type
8859 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
8860 asection
*input_section
,
8862 Elf_Internal_Rela
*rel
,
8865 bfd_vma shift
, x
, mask
;
8866 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
8867 bfd_reloc_status_type r
;
8868 bfd_size_type octets
;
8870 /* Perform this reloc, since it is complex.
8871 (this is not to say that it necessarily refers to a complex
8872 symbol; merely that it is a self-describing CGEN based reloc.
8873 i.e. the addend has the complete reloc information (bit start, end,
8874 word size, etc) encoded within it.). */
8876 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
8877 &chunksz
, &lsb0_p
, &signed_p
,
8878 &trunc_p
, rel
->r_addend
);
8880 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
8883 shift
= (start
+ 1) - len
;
8885 shift
= (8 * wordsz
) - (start
+ len
);
8887 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
8888 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
8891 printf ("Doing complex reloc: "
8892 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8893 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8894 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8895 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
8896 oplen
, (unsigned long) x
, (unsigned long) mask
,
8897 (unsigned long) relocation
);
8902 /* Now do an overflow check. */
8903 r
= bfd_check_overflow ((signed_p
8904 ? complain_overflow_signed
8905 : complain_overflow_unsigned
),
8906 len
, 0, (8 * wordsz
),
8910 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
8913 printf (" relocation: %8.8lx\n"
8914 " shifted mask: %8.8lx\n"
8915 " shifted/masked reloc: %8.8lx\n"
8916 " result: %8.8lx\n",
8917 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
8918 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
8920 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
8924 /* Functions to read r_offset from external (target order) reloc
8925 entry. Faster than bfd_getl32 et al, because we let the compiler
8926 know the value is aligned. */
8929 ext32l_r_offset (const void *p
)
8936 const union aligned32
*a
8937 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8939 uint32_t aval
= ( (uint32_t) a
->c
[0]
8940 | (uint32_t) a
->c
[1] << 8
8941 | (uint32_t) a
->c
[2] << 16
8942 | (uint32_t) a
->c
[3] << 24);
8947 ext32b_r_offset (const void *p
)
8954 const union aligned32
*a
8955 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8957 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
8958 | (uint32_t) a
->c
[1] << 16
8959 | (uint32_t) a
->c
[2] << 8
8960 | (uint32_t) a
->c
[3]);
8964 #ifdef BFD_HOST_64_BIT
8966 ext64l_r_offset (const void *p
)
8973 const union aligned64
*a
8974 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8976 uint64_t aval
= ( (uint64_t) a
->c
[0]
8977 | (uint64_t) a
->c
[1] << 8
8978 | (uint64_t) a
->c
[2] << 16
8979 | (uint64_t) a
->c
[3] << 24
8980 | (uint64_t) a
->c
[4] << 32
8981 | (uint64_t) a
->c
[5] << 40
8982 | (uint64_t) a
->c
[6] << 48
8983 | (uint64_t) a
->c
[7] << 56);
8988 ext64b_r_offset (const void *p
)
8995 const union aligned64
*a
8996 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8998 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
8999 | (uint64_t) a
->c
[1] << 48
9000 | (uint64_t) a
->c
[2] << 40
9001 | (uint64_t) a
->c
[3] << 32
9002 | (uint64_t) a
->c
[4] << 24
9003 | (uint64_t) a
->c
[5] << 16
9004 | (uint64_t) a
->c
[6] << 8
9005 | (uint64_t) a
->c
[7]);
9010 /* When performing a relocatable link, the input relocations are
9011 preserved. But, if they reference global symbols, the indices
9012 referenced must be updated. Update all the relocations found in
9016 elf_link_adjust_relocs (bfd
*abfd
,
9018 struct bfd_elf_section_reloc_data
*reldata
,
9020 struct bfd_link_info
*info
)
9023 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9025 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9026 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9027 bfd_vma r_type_mask
;
9029 unsigned int count
= reldata
->count
;
9030 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9032 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9034 swap_in
= bed
->s
->swap_reloc_in
;
9035 swap_out
= bed
->s
->swap_reloc_out
;
9037 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9039 swap_in
= bed
->s
->swap_reloca_in
;
9040 swap_out
= bed
->s
->swap_reloca_out
;
9045 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9048 if (bed
->s
->arch_size
== 32)
9055 r_type_mask
= 0xffffffff;
9059 erela
= reldata
->hdr
->contents
;
9060 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9062 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9065 if (*rel_hash
== NULL
)
9068 if ((*rel_hash
)->indx
== -2
9069 && info
->gc_sections
9070 && ! info
->gc_keep_exported
)
9072 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9073 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9075 (*rel_hash
)->root
.root
.string
);
9076 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9078 bfd_set_error (bfd_error_invalid_operation
);
9081 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9083 (*swap_in
) (abfd
, erela
, irela
);
9084 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9085 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9086 | (irela
[j
].r_info
& r_type_mask
));
9087 (*swap_out
) (abfd
, irela
, erela
);
9090 if (bed
->elf_backend_update_relocs
)
9091 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9093 if (sort
&& count
!= 0)
9095 bfd_vma (*ext_r_off
) (const void *);
9098 bfd_byte
*base
, *end
, *p
, *loc
;
9099 bfd_byte
*buf
= NULL
;
9101 if (bed
->s
->arch_size
== 32)
9103 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9104 ext_r_off
= ext32l_r_offset
;
9105 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9106 ext_r_off
= ext32b_r_offset
;
9112 #ifdef BFD_HOST_64_BIT
9113 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9114 ext_r_off
= ext64l_r_offset
;
9115 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9116 ext_r_off
= ext64b_r_offset
;
9122 /* Must use a stable sort here. A modified insertion sort,
9123 since the relocs are mostly sorted already. */
9124 elt_size
= reldata
->hdr
->sh_entsize
;
9125 base
= reldata
->hdr
->contents
;
9126 end
= base
+ count
* elt_size
;
9127 if (elt_size
> sizeof (Elf64_External_Rela
))
9130 /* Ensure the first element is lowest. This acts as a sentinel,
9131 speeding the main loop below. */
9132 r_off
= (*ext_r_off
) (base
);
9133 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9135 bfd_vma r_off2
= (*ext_r_off
) (p
);
9144 /* Don't just swap *base and *loc as that changes the order
9145 of the original base[0] and base[1] if they happen to
9146 have the same r_offset. */
9147 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9148 memcpy (onebuf
, loc
, elt_size
);
9149 memmove (base
+ elt_size
, base
, loc
- base
);
9150 memcpy (base
, onebuf
, elt_size
);
9153 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9155 /* base to p is sorted, *p is next to insert. */
9156 r_off
= (*ext_r_off
) (p
);
9157 /* Search the sorted region for location to insert. */
9159 while (r_off
< (*ext_r_off
) (loc
))
9164 /* Chances are there is a run of relocs to insert here,
9165 from one of more input files. Files are not always
9166 linked in order due to the way elf_link_input_bfd is
9167 called. See pr17666. */
9168 size_t sortlen
= p
- loc
;
9169 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9170 size_t runlen
= elt_size
;
9171 size_t buf_size
= 96 * 1024;
9172 while (p
+ runlen
< end
9173 && (sortlen
<= buf_size
9174 || runlen
+ elt_size
<= buf_size
)
9175 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9179 buf
= bfd_malloc (buf_size
);
9183 if (runlen
< sortlen
)
9185 memcpy (buf
, p
, runlen
);
9186 memmove (loc
+ runlen
, loc
, sortlen
);
9187 memcpy (loc
, buf
, runlen
);
9191 memcpy (buf
, loc
, sortlen
);
9192 memmove (loc
, p
, runlen
);
9193 memcpy (loc
+ runlen
, buf
, sortlen
);
9195 p
+= runlen
- elt_size
;
9198 /* Hashes are no longer valid. */
9199 free (reldata
->hashes
);
9200 reldata
->hashes
= NULL
;
9206 struct elf_link_sort_rela
9212 enum elf_reloc_type_class type
;
9213 /* We use this as an array of size int_rels_per_ext_rel. */
9214 Elf_Internal_Rela rela
[1];
9217 /* qsort stability here and for cmp2 is only an issue if multiple
9218 dynamic relocations are emitted at the same address. But targets
9219 that apply a series of dynamic relocations each operating on the
9220 result of the prior relocation can't use -z combreloc as
9221 implemented anyway. Such schemes tend to be broken by sorting on
9222 symbol index. That leaves dynamic NONE relocs as the only other
9223 case where ld might emit multiple relocs at the same address, and
9224 those are only emitted due to target bugs. */
9227 elf_link_sort_cmp1 (const void *A
, const void *B
)
9229 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9230 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9231 int relativea
, relativeb
;
9233 relativea
= a
->type
== reloc_class_relative
;
9234 relativeb
= b
->type
== reloc_class_relative
;
9236 if (relativea
< relativeb
)
9238 if (relativea
> relativeb
)
9240 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9242 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9244 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9246 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9252 elf_link_sort_cmp2 (const void *A
, const void *B
)
9254 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9255 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9257 if (a
->type
< b
->type
)
9259 if (a
->type
> b
->type
)
9261 if (a
->u
.offset
< b
->u
.offset
)
9263 if (a
->u
.offset
> b
->u
.offset
)
9265 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9267 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9273 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9275 asection
*dynamic_relocs
;
9278 bfd_size_type count
, size
;
9279 size_t i
, ret
, sort_elt
, ext_size
;
9280 bfd_byte
*sort
, *s_non_relative
, *p
;
9281 struct elf_link_sort_rela
*sq
;
9282 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9283 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9284 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9285 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9286 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9287 struct bfd_link_order
*lo
;
9289 bfd_boolean use_rela
;
9291 /* Find a dynamic reloc section. */
9292 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9293 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9294 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9295 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9297 bfd_boolean use_rela_initialised
= FALSE
;
9299 /* This is just here to stop gcc from complaining.
9300 Its initialization checking code is not perfect. */
9303 /* Both sections are present. Examine the sizes
9304 of the indirect sections to help us choose. */
9305 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9306 if (lo
->type
== bfd_indirect_link_order
)
9308 asection
*o
= lo
->u
.indirect
.section
;
9310 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9312 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9313 /* Section size is divisible by both rel and rela sizes.
9314 It is of no help to us. */
9318 /* Section size is only divisible by rela. */
9319 if (use_rela_initialised
&& !use_rela
)
9321 _bfd_error_handler (_("%pB: unable to sort relocs - "
9322 "they are in more than one size"),
9324 bfd_set_error (bfd_error_invalid_operation
);
9330 use_rela_initialised
= TRUE
;
9334 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9336 /* Section size is only divisible by rel. */
9337 if (use_rela_initialised
&& use_rela
)
9339 _bfd_error_handler (_("%pB: unable to sort relocs - "
9340 "they are in more than one size"),
9342 bfd_set_error (bfd_error_invalid_operation
);
9348 use_rela_initialised
= TRUE
;
9353 /* The section size is not divisible by either -
9354 something is wrong. */
9355 _bfd_error_handler (_("%pB: unable to sort relocs - "
9356 "they are of an unknown size"), abfd
);
9357 bfd_set_error (bfd_error_invalid_operation
);
9362 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9363 if (lo
->type
== bfd_indirect_link_order
)
9365 asection
*o
= lo
->u
.indirect
.section
;
9367 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9369 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9370 /* Section size is divisible by both rel and rela sizes.
9371 It is of no help to us. */
9375 /* Section size is only divisible by rela. */
9376 if (use_rela_initialised
&& !use_rela
)
9378 _bfd_error_handler (_("%pB: unable to sort relocs - "
9379 "they are in more than one size"),
9381 bfd_set_error (bfd_error_invalid_operation
);
9387 use_rela_initialised
= TRUE
;
9391 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9393 /* Section size is only divisible by rel. */
9394 if (use_rela_initialised
&& use_rela
)
9396 _bfd_error_handler (_("%pB: unable to sort relocs - "
9397 "they are in more than one size"),
9399 bfd_set_error (bfd_error_invalid_operation
);
9405 use_rela_initialised
= TRUE
;
9410 /* The section size is not divisible by either -
9411 something is wrong. */
9412 _bfd_error_handler (_("%pB: unable to sort relocs - "
9413 "they are of an unknown size"), abfd
);
9414 bfd_set_error (bfd_error_invalid_operation
);
9419 if (! use_rela_initialised
)
9423 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9425 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9432 dynamic_relocs
= rela_dyn
;
9433 ext_size
= bed
->s
->sizeof_rela
;
9434 swap_in
= bed
->s
->swap_reloca_in
;
9435 swap_out
= bed
->s
->swap_reloca_out
;
9439 dynamic_relocs
= rel_dyn
;
9440 ext_size
= bed
->s
->sizeof_rel
;
9441 swap_in
= bed
->s
->swap_reloc_in
;
9442 swap_out
= bed
->s
->swap_reloc_out
;
9446 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9447 if (lo
->type
== bfd_indirect_link_order
)
9448 size
+= lo
->u
.indirect
.section
->size
;
9450 if (size
!= dynamic_relocs
->size
)
9453 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9454 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9456 count
= dynamic_relocs
->size
/ ext_size
;
9459 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9463 (*info
->callbacks
->warning
)
9464 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9468 if (bed
->s
->arch_size
== 32)
9469 r_sym_mask
= ~(bfd_vma
) 0xff;
9471 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9473 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9474 if (lo
->type
== bfd_indirect_link_order
)
9476 bfd_byte
*erel
, *erelend
;
9477 asection
*o
= lo
->u
.indirect
.section
;
9479 if (o
->contents
== NULL
&& o
->size
!= 0)
9481 /* This is a reloc section that is being handled as a normal
9482 section. See bfd_section_from_shdr. We can't combine
9483 relocs in this case. */
9488 erelend
= o
->contents
+ o
->size
;
9489 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9491 while (erel
< erelend
)
9493 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9495 (*swap_in
) (abfd
, erel
, s
->rela
);
9496 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9497 s
->u
.sym_mask
= r_sym_mask
;
9503 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9505 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9507 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9508 if (s
->type
!= reloc_class_relative
)
9514 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9515 for (; i
< count
; i
++, p
+= sort_elt
)
9517 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9518 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9520 sp
->u
.offset
= sq
->rela
->r_offset
;
9523 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9525 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9526 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9528 /* We have plt relocs in .rela.dyn. */
9529 sq
= (struct elf_link_sort_rela
*) sort
;
9530 for (i
= 0; i
< count
; i
++)
9531 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9533 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9535 struct bfd_link_order
**plo
;
9536 /* Put srelplt link_order last. This is so the output_offset
9537 set in the next loop is correct for DT_JMPREL. */
9538 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9539 if ((*plo
)->type
== bfd_indirect_link_order
9540 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9546 plo
= &(*plo
)->next
;
9549 dynamic_relocs
->map_tail
.link_order
= lo
;
9554 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9555 if (lo
->type
== bfd_indirect_link_order
)
9557 bfd_byte
*erel
, *erelend
;
9558 asection
*o
= lo
->u
.indirect
.section
;
9561 erelend
= o
->contents
+ o
->size
;
9562 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9563 while (erel
< erelend
)
9565 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9566 (*swap_out
) (abfd
, s
->rela
, erel
);
9573 *psec
= dynamic_relocs
;
9577 /* Add a symbol to the output symbol string table. */
9580 elf_link_output_symstrtab (struct elf_final_link_info
*flinfo
,
9582 Elf_Internal_Sym
*elfsym
,
9583 asection
*input_sec
,
9584 struct elf_link_hash_entry
*h
)
9586 int (*output_symbol_hook
)
9587 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9588 struct elf_link_hash_entry
*);
9589 struct elf_link_hash_table
*hash_table
;
9590 const struct elf_backend_data
*bed
;
9591 bfd_size_type strtabsize
;
9593 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9595 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9596 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9597 if (output_symbol_hook
!= NULL
)
9599 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9604 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9605 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9606 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9607 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9611 || (input_sec
->flags
& SEC_EXCLUDE
))
9612 elfsym
->st_name
= (unsigned long) -1;
9615 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9616 to get the final offset for st_name. */
9618 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9620 if (elfsym
->st_name
== (unsigned long) -1)
9624 hash_table
= elf_hash_table (flinfo
->info
);
9625 strtabsize
= hash_table
->strtabsize
;
9626 if (strtabsize
<= hash_table
->strtabcount
)
9628 strtabsize
+= strtabsize
;
9629 hash_table
->strtabsize
= strtabsize
;
9630 strtabsize
*= sizeof (*hash_table
->strtab
);
9632 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9634 if (hash_table
->strtab
== NULL
)
9637 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9638 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9639 = hash_table
->strtabcount
;
9640 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9641 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9643 flinfo
->output_bfd
->symcount
+= 1;
9644 hash_table
->strtabcount
+= 1;
9649 /* Swap symbols out to the symbol table and flush the output symbols to
9653 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9655 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9658 const struct elf_backend_data
*bed
;
9660 Elf_Internal_Shdr
*hdr
;
9664 if (!hash_table
->strtabcount
)
9667 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9669 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9671 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9672 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9676 if (flinfo
->symshndxbuf
)
9678 amt
= sizeof (Elf_External_Sym_Shndx
);
9679 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9680 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9681 if (flinfo
->symshndxbuf
== NULL
)
9688 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9690 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9691 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9692 elfsym
->sym
.st_name
= 0;
9695 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9696 elfsym
->sym
.st_name
);
9697 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9698 ((bfd_byte
*) symbuf
9699 + (elfsym
->dest_index
9700 * bed
->s
->sizeof_sym
)),
9701 (flinfo
->symshndxbuf
9702 + elfsym
->destshndx_index
));
9705 /* Allow the linker to examine the strtab and symtab now they are
9708 if (flinfo
->info
->callbacks
->examine_strtab
)
9709 flinfo
->info
->callbacks
->examine_strtab (hash_table
->strtab
,
9710 hash_table
->strtabcount
,
9713 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9714 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9715 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9716 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9717 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9719 hdr
->sh_size
+= amt
;
9727 free (hash_table
->strtab
);
9728 hash_table
->strtab
= NULL
;
9733 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9736 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9738 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9739 && sym
->st_shndx
< SHN_LORESERVE
)
9741 /* The gABI doesn't support dynamic symbols in output sections
9744 /* xgettext:c-format */
9745 (_("%pB: too many sections: %d (>= %d)"),
9746 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9747 bfd_set_error (bfd_error_nonrepresentable_section
);
9753 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9754 allowing an unsatisfied unversioned symbol in the DSO to match a
9755 versioned symbol that would normally require an explicit version.
9756 We also handle the case that a DSO references a hidden symbol
9757 which may be satisfied by a versioned symbol in another DSO. */
9760 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
9761 const struct elf_backend_data
*bed
,
9762 struct elf_link_hash_entry
*h
)
9765 struct elf_link_loaded_list
*loaded
;
9767 if (!is_elf_hash_table (info
->hash
))
9770 /* Check indirect symbol. */
9771 while (h
->root
.type
== bfd_link_hash_indirect
)
9772 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9774 switch (h
->root
.type
)
9780 case bfd_link_hash_undefined
:
9781 case bfd_link_hash_undefweak
:
9782 abfd
= h
->root
.u
.undef
.abfd
;
9784 || (abfd
->flags
& DYNAMIC
) == 0
9785 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
9789 case bfd_link_hash_defined
:
9790 case bfd_link_hash_defweak
:
9791 abfd
= h
->root
.u
.def
.section
->owner
;
9794 case bfd_link_hash_common
:
9795 abfd
= h
->root
.u
.c
.p
->section
->owner
;
9798 BFD_ASSERT (abfd
!= NULL
);
9800 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
9802 loaded
= loaded
->next
)
9805 Elf_Internal_Shdr
*hdr
;
9809 Elf_Internal_Shdr
*versymhdr
;
9810 Elf_Internal_Sym
*isym
;
9811 Elf_Internal_Sym
*isymend
;
9812 Elf_Internal_Sym
*isymbuf
;
9813 Elf_External_Versym
*ever
;
9814 Elf_External_Versym
*extversym
;
9816 input
= loaded
->abfd
;
9818 /* We check each DSO for a possible hidden versioned definition. */
9820 || elf_dynversym (input
) == 0)
9823 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
9825 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9826 if (elf_bad_symtab (input
))
9828 extsymcount
= symcount
;
9833 extsymcount
= symcount
- hdr
->sh_info
;
9834 extsymoff
= hdr
->sh_info
;
9837 if (extsymcount
== 0)
9840 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
9842 if (isymbuf
== NULL
)
9845 /* Read in any version definitions. */
9846 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
9847 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
9848 || (extversym
= (Elf_External_Versym
*)
9849 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
9850 versymhdr
->sh_size
)) == NULL
)
9856 ever
= extversym
+ extsymoff
;
9857 isymend
= isymbuf
+ extsymcount
;
9858 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
9861 Elf_Internal_Versym iver
;
9862 unsigned short version_index
;
9864 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
9865 || isym
->st_shndx
== SHN_UNDEF
)
9868 name
= bfd_elf_string_from_elf_section (input
,
9871 if (strcmp (name
, h
->root
.root
.string
) != 0)
9874 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
9876 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
9878 && h
->forced_local
))
9880 /* If we have a non-hidden versioned sym, then it should
9881 have provided a definition for the undefined sym unless
9882 it is defined in a non-shared object and forced local.
9887 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
9888 if (version_index
== 1 || version_index
== 2)
9890 /* This is the base or first version. We can use it. */
9904 /* Convert ELF common symbol TYPE. */
9907 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
9909 /* Commom symbol can only appear in relocatable link. */
9910 if (!bfd_link_relocatable (info
))
9912 switch (info
->elf_stt_common
)
9916 case elf_stt_common
:
9919 case no_elf_stt_common
:
9926 /* Add an external symbol to the symbol table. This is called from
9927 the hash table traversal routine. When generating a shared object,
9928 we go through the symbol table twice. The first time we output
9929 anything that might have been forced to local scope in a version
9930 script. The second time we output the symbols that are still
9934 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
9936 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
9937 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
9938 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
9940 Elf_Internal_Sym sym
;
9941 asection
*input_sec
;
9942 const struct elf_backend_data
*bed
;
9947 if (h
->root
.type
== bfd_link_hash_warning
)
9949 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9950 if (h
->root
.type
== bfd_link_hash_new
)
9954 /* Decide whether to output this symbol in this pass. */
9955 if (eoinfo
->localsyms
)
9957 if (!h
->forced_local
)
9962 if (h
->forced_local
)
9966 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9968 if (h
->root
.type
== bfd_link_hash_undefined
)
9970 /* If we have an undefined symbol reference here then it must have
9971 come from a shared library that is being linked in. (Undefined
9972 references in regular files have already been handled unless
9973 they are in unreferenced sections which are removed by garbage
9975 bfd_boolean ignore_undef
= FALSE
;
9977 /* Some symbols may be special in that the fact that they're
9978 undefined can be safely ignored - let backend determine that. */
9979 if (bed
->elf_backend_ignore_undef_symbol
)
9980 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
9982 /* If we are reporting errors for this situation then do so now. */
9984 && h
->ref_dynamic_nonweak
9985 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
9986 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
9987 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
9989 flinfo
->info
->callbacks
->undefined_symbol
9990 (flinfo
->info
, h
->root
.root
.string
,
9991 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
9992 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
9993 && !flinfo
->info
->warn_unresolved_syms
);
9996 /* Strip a global symbol defined in a discarded section. */
10001 /* We should also warn if a forced local symbol is referenced from
10002 shared libraries. */
10003 if (bfd_link_executable (flinfo
->info
)
10008 && h
->ref_dynamic_nonweak
10009 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10013 struct elf_link_hash_entry
*hi
= h
;
10015 /* Check indirect symbol. */
10016 while (hi
->root
.type
== bfd_link_hash_indirect
)
10017 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10019 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10020 /* xgettext:c-format */
10021 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10022 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10023 /* xgettext:c-format */
10024 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10026 /* xgettext:c-format */
10027 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10028 def_bfd
= flinfo
->output_bfd
;
10029 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10030 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10031 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10032 h
->root
.root
.string
, def_bfd
);
10033 bfd_set_error (bfd_error_bad_value
);
10034 eoinfo
->failed
= TRUE
;
10038 /* We don't want to output symbols that have never been mentioned by
10039 a regular file, or that we have been told to strip. However, if
10040 h->indx is set to -2, the symbol is used by a reloc and we must
10045 else if ((h
->def_dynamic
10047 || h
->root
.type
== bfd_link_hash_new
)
10049 && !h
->ref_regular
)
10051 else if (flinfo
->info
->strip
== strip_all
)
10053 else if (flinfo
->info
->strip
== strip_some
10054 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10055 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
10057 else if ((h
->root
.type
== bfd_link_hash_defined
10058 || h
->root
.type
== bfd_link_hash_defweak
)
10059 && ((flinfo
->info
->strip_discarded
10060 && discarded_section (h
->root
.u
.def
.section
))
10061 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10062 && h
->root
.u
.def
.section
->owner
!= NULL
10063 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10065 else if ((h
->root
.type
== bfd_link_hash_undefined
10066 || h
->root
.type
== bfd_link_hash_undefweak
)
10067 && h
->root
.u
.undef
.abfd
!= NULL
10068 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10073 /* If we're stripping it, and it's not a dynamic symbol, there's
10074 nothing else to do. However, if it is a forced local symbol or
10075 an ifunc symbol we need to give the backend finish_dynamic_symbol
10076 function a chance to make it dynamic. */
10078 && h
->dynindx
== -1
10079 && type
!= STT_GNU_IFUNC
10080 && !h
->forced_local
)
10084 sym
.st_size
= h
->size
;
10085 sym
.st_other
= h
->other
;
10086 switch (h
->root
.type
)
10089 case bfd_link_hash_new
:
10090 case bfd_link_hash_warning
:
10094 case bfd_link_hash_undefined
:
10095 case bfd_link_hash_undefweak
:
10096 input_sec
= bfd_und_section_ptr
;
10097 sym
.st_shndx
= SHN_UNDEF
;
10100 case bfd_link_hash_defined
:
10101 case bfd_link_hash_defweak
:
10103 input_sec
= h
->root
.u
.def
.section
;
10104 if (input_sec
->output_section
!= NULL
)
10107 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10108 input_sec
->output_section
);
10109 if (sym
.st_shndx
== SHN_BAD
)
10112 /* xgettext:c-format */
10113 (_("%pB: could not find output section %pA for input section %pA"),
10114 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10115 bfd_set_error (bfd_error_nonrepresentable_section
);
10116 eoinfo
->failed
= TRUE
;
10120 /* ELF symbols in relocatable files are section relative,
10121 but in nonrelocatable files they are virtual
10123 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10124 if (!bfd_link_relocatable (flinfo
->info
))
10126 sym
.st_value
+= input_sec
->output_section
->vma
;
10127 if (h
->type
== STT_TLS
)
10129 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10130 if (tls_sec
!= NULL
)
10131 sym
.st_value
-= tls_sec
->vma
;
10137 BFD_ASSERT (input_sec
->owner
== NULL
10138 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10139 sym
.st_shndx
= SHN_UNDEF
;
10140 input_sec
= bfd_und_section_ptr
;
10145 case bfd_link_hash_common
:
10146 input_sec
= h
->root
.u
.c
.p
->section
;
10147 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10148 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10151 case bfd_link_hash_indirect
:
10152 /* These symbols are created by symbol versioning. They point
10153 to the decorated version of the name. For example, if the
10154 symbol foo@@GNU_1.2 is the default, which should be used when
10155 foo is used with no version, then we add an indirect symbol
10156 foo which points to foo@@GNU_1.2. We ignore these symbols,
10157 since the indirected symbol is already in the hash table. */
10161 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10162 switch (h
->root
.type
)
10164 case bfd_link_hash_common
:
10165 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10167 case bfd_link_hash_defined
:
10168 case bfd_link_hash_defweak
:
10169 if (bed
->common_definition (&sym
))
10170 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10174 case bfd_link_hash_undefined
:
10175 case bfd_link_hash_undefweak
:
10181 if (h
->forced_local
)
10183 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10184 /* Turn off visibility on local symbol. */
10185 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10187 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10188 else if (h
->unique_global
&& h
->def_regular
)
10189 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10190 else if (h
->root
.type
== bfd_link_hash_undefweak
10191 || h
->root
.type
== bfd_link_hash_defweak
)
10192 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10194 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10195 sym
.st_target_internal
= h
->target_internal
;
10197 /* Give the processor backend a chance to tweak the symbol value,
10198 and also to finish up anything that needs to be done for this
10199 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10200 forced local syms when non-shared is due to a historical quirk.
10201 STT_GNU_IFUNC symbol must go through PLT. */
10202 if ((h
->type
== STT_GNU_IFUNC
10204 && !bfd_link_relocatable (flinfo
->info
))
10205 || ((h
->dynindx
!= -1
10206 || h
->forced_local
)
10207 && ((bfd_link_pic (flinfo
->info
)
10208 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10209 || h
->root
.type
!= bfd_link_hash_undefweak
))
10210 || !h
->forced_local
)
10211 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10213 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10214 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10216 eoinfo
->failed
= TRUE
;
10221 /* If we are marking the symbol as undefined, and there are no
10222 non-weak references to this symbol from a regular object, then
10223 mark the symbol as weak undefined; if there are non-weak
10224 references, mark the symbol as strong. We can't do this earlier,
10225 because it might not be marked as undefined until the
10226 finish_dynamic_symbol routine gets through with it. */
10227 if (sym
.st_shndx
== SHN_UNDEF
10229 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10230 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10233 type
= ELF_ST_TYPE (sym
.st_info
);
10235 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10236 if (type
== STT_GNU_IFUNC
)
10239 if (h
->ref_regular_nonweak
)
10240 bindtype
= STB_GLOBAL
;
10242 bindtype
= STB_WEAK
;
10243 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10246 /* If this is a symbol defined in a dynamic library, don't use the
10247 symbol size from the dynamic library. Relinking an executable
10248 against a new library may introduce gratuitous changes in the
10249 executable's symbols if we keep the size. */
10250 if (sym
.st_shndx
== SHN_UNDEF
10255 /* If a non-weak symbol with non-default visibility is not defined
10256 locally, it is a fatal error. */
10257 if (!bfd_link_relocatable (flinfo
->info
)
10258 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10259 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10260 && h
->root
.type
== bfd_link_hash_undefined
10261 && !h
->def_regular
)
10265 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10266 /* xgettext:c-format */
10267 msg
= _("%pB: protected symbol `%s' isn't defined");
10268 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10269 /* xgettext:c-format */
10270 msg
= _("%pB: internal symbol `%s' isn't defined");
10272 /* xgettext:c-format */
10273 msg
= _("%pB: hidden symbol `%s' isn't defined");
10274 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10275 bfd_set_error (bfd_error_bad_value
);
10276 eoinfo
->failed
= TRUE
;
10280 /* If this symbol should be put in the .dynsym section, then put it
10281 there now. We already know the symbol index. We also fill in
10282 the entry in the .hash section. */
10283 if (h
->dynindx
!= -1
10284 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10285 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10286 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10290 /* Since there is no version information in the dynamic string,
10291 if there is no version info in symbol version section, we will
10292 have a run-time problem if not linking executable, referenced
10293 by shared library, or not bound locally. */
10294 if (h
->verinfo
.verdef
== NULL
10295 && (!bfd_link_executable (flinfo
->info
)
10297 || !h
->def_regular
))
10299 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10301 if (p
&& p
[1] != '\0')
10304 /* xgettext:c-format */
10305 (_("%pB: no symbol version section for versioned symbol `%s'"),
10306 flinfo
->output_bfd
, h
->root
.root
.string
);
10307 eoinfo
->failed
= TRUE
;
10312 sym
.st_name
= h
->dynstr_index
;
10313 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10314 + h
->dynindx
* bed
->s
->sizeof_sym
);
10315 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10317 eoinfo
->failed
= TRUE
;
10320 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10322 if (flinfo
->hash_sec
!= NULL
)
10324 size_t hash_entry_size
;
10325 bfd_byte
*bucketpos
;
10327 size_t bucketcount
;
10330 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10331 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10334 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10335 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10336 + (bucket
+ 2) * hash_entry_size
);
10337 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10338 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10340 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10341 ((bfd_byte
*) flinfo
->hash_sec
->contents
10342 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10345 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10347 Elf_Internal_Versym iversym
;
10348 Elf_External_Versym
*eversym
;
10350 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10352 if (h
->verinfo
.verdef
== NULL
10353 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10354 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10355 iversym
.vs_vers
= 0;
10357 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10361 if (h
->verinfo
.vertree
== NULL
)
10362 iversym
.vs_vers
= 1;
10364 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10365 if (flinfo
->info
->create_default_symver
)
10369 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10370 defined locally. */
10371 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10372 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10374 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10375 eversym
+= h
->dynindx
;
10376 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10380 /* If the symbol is undefined, and we didn't output it to .dynsym,
10381 strip it from .symtab too. Obviously we can't do this for
10382 relocatable output or when needed for --emit-relocs. */
10383 else if (input_sec
== bfd_und_section_ptr
10385 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10386 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10387 && !bfd_link_relocatable (flinfo
->info
))
10390 /* Also strip others that we couldn't earlier due to dynamic symbol
10394 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10397 /* Output a FILE symbol so that following locals are not associated
10398 with the wrong input file. We need one for forced local symbols
10399 if we've seen more than one FILE symbol or when we have exactly
10400 one FILE symbol but global symbols are present in a file other
10401 than the one with the FILE symbol. We also need one if linker
10402 defined symbols are present. In practice these conditions are
10403 always met, so just emit the FILE symbol unconditionally. */
10404 if (eoinfo
->localsyms
10405 && !eoinfo
->file_sym_done
10406 && eoinfo
->flinfo
->filesym_count
!= 0)
10408 Elf_Internal_Sym fsym
;
10410 memset (&fsym
, 0, sizeof (fsym
));
10411 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10412 fsym
.st_shndx
= SHN_ABS
;
10413 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10414 bfd_und_section_ptr
, NULL
))
10417 eoinfo
->file_sym_done
= TRUE
;
10420 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10421 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10425 eoinfo
->failed
= TRUE
;
10430 else if (h
->indx
== -2)
10436 /* Return TRUE if special handling is done for relocs in SEC against
10437 symbols defined in discarded sections. */
10440 elf_section_ignore_discarded_relocs (asection
*sec
)
10442 const struct elf_backend_data
*bed
;
10444 switch (sec
->sec_info_type
)
10446 case SEC_INFO_TYPE_STABS
:
10447 case SEC_INFO_TYPE_EH_FRAME
:
10448 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10454 bed
= get_elf_backend_data (sec
->owner
);
10455 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10456 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10462 /* Return a mask saying how ld should treat relocations in SEC against
10463 symbols defined in discarded sections. If this function returns
10464 COMPLAIN set, ld will issue a warning message. If this function
10465 returns PRETEND set, and the discarded section was link-once and the
10466 same size as the kept link-once section, ld will pretend that the
10467 symbol was actually defined in the kept section. Otherwise ld will
10468 zero the reloc (at least that is the intent, but some cooperation by
10469 the target dependent code is needed, particularly for REL targets). */
10472 _bfd_elf_default_action_discarded (asection
*sec
)
10474 if (sec
->flags
& SEC_DEBUGGING
)
10477 if (strcmp (".eh_frame", sec
->name
) == 0)
10480 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10483 return COMPLAIN
| PRETEND
;
10486 /* Find a match between a section and a member of a section group. */
10489 match_group_member (asection
*sec
, asection
*group
,
10490 struct bfd_link_info
*info
)
10492 asection
*first
= elf_next_in_group (group
);
10493 asection
*s
= first
;
10497 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10500 s
= elf_next_in_group (s
);
10508 /* Check if the kept section of a discarded section SEC can be used
10509 to replace it. Return the replacement if it is OK. Otherwise return
10513 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10517 kept
= sec
->kept_section
;
10520 if ((kept
->flags
& SEC_GROUP
) != 0)
10521 kept
= match_group_member (sec
, kept
, info
);
10523 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10524 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
10526 sec
->kept_section
= kept
;
10531 /* Link an input file into the linker output file. This function
10532 handles all the sections and relocations of the input file at once.
10533 This is so that we only have to read the local symbols once, and
10534 don't have to keep them in memory. */
10537 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10539 int (*relocate_section
)
10540 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10541 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10543 Elf_Internal_Shdr
*symtab_hdr
;
10544 size_t locsymcount
;
10546 Elf_Internal_Sym
*isymbuf
;
10547 Elf_Internal_Sym
*isym
;
10548 Elf_Internal_Sym
*isymend
;
10550 asection
**ppsection
;
10552 const struct elf_backend_data
*bed
;
10553 struct elf_link_hash_entry
**sym_hashes
;
10554 bfd_size_type address_size
;
10555 bfd_vma r_type_mask
;
10557 bfd_boolean have_file_sym
= FALSE
;
10559 output_bfd
= flinfo
->output_bfd
;
10560 bed
= get_elf_backend_data (output_bfd
);
10561 relocate_section
= bed
->elf_backend_relocate_section
;
10563 /* If this is a dynamic object, we don't want to do anything here:
10564 we don't want the local symbols, and we don't want the section
10566 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10569 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10570 if (elf_bad_symtab (input_bfd
))
10572 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10577 locsymcount
= symtab_hdr
->sh_info
;
10578 extsymoff
= symtab_hdr
->sh_info
;
10581 /* Read the local symbols. */
10582 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10583 if (isymbuf
== NULL
&& locsymcount
!= 0)
10585 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10586 flinfo
->internal_syms
,
10587 flinfo
->external_syms
,
10588 flinfo
->locsym_shndx
);
10589 if (isymbuf
== NULL
)
10593 /* Find local symbol sections and adjust values of symbols in
10594 SEC_MERGE sections. Write out those local symbols we know are
10595 going into the output file. */
10596 isymend
= isymbuf
+ locsymcount
;
10597 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10599 isym
++, pindex
++, ppsection
++)
10603 Elf_Internal_Sym osym
;
10609 if (elf_bad_symtab (input_bfd
))
10611 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10618 if (isym
->st_shndx
== SHN_UNDEF
)
10619 isec
= bfd_und_section_ptr
;
10620 else if (isym
->st_shndx
== SHN_ABS
)
10621 isec
= bfd_abs_section_ptr
;
10622 else if (isym
->st_shndx
== SHN_COMMON
)
10623 isec
= bfd_com_section_ptr
;
10626 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10629 /* Don't attempt to output symbols with st_shnx in the
10630 reserved range other than SHN_ABS and SHN_COMMON. */
10631 isec
= bfd_und_section_ptr
;
10633 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10634 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10636 _bfd_merged_section_offset (output_bfd
, &isec
,
10637 elf_section_data (isec
)->sec_info
,
10643 /* Don't output the first, undefined, symbol. In fact, don't
10644 output any undefined local symbol. */
10645 if (isec
== bfd_und_section_ptr
)
10648 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10650 /* We never output section symbols. Instead, we use the
10651 section symbol of the corresponding section in the output
10656 /* If we are stripping all symbols, we don't want to output this
10658 if (flinfo
->info
->strip
== strip_all
)
10661 /* If we are discarding all local symbols, we don't want to
10662 output this one. If we are generating a relocatable output
10663 file, then some of the local symbols may be required by
10664 relocs; we output them below as we discover that they are
10666 if (flinfo
->info
->discard
== discard_all
)
10669 /* If this symbol is defined in a section which we are
10670 discarding, we don't need to keep it. */
10671 if (isym
->st_shndx
!= SHN_UNDEF
10672 && isym
->st_shndx
< SHN_LORESERVE
10673 && isec
->output_section
== NULL
10674 && flinfo
->info
->non_contiguous_regions
10675 && flinfo
->info
->non_contiguous_regions_warnings
)
10677 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10678 "discards section `%s' from '%s'\n"),
10679 isec
->name
, bfd_get_filename (isec
->owner
));
10683 if (isym
->st_shndx
!= SHN_UNDEF
10684 && isym
->st_shndx
< SHN_LORESERVE
10685 && bfd_section_removed_from_list (output_bfd
,
10686 isec
->output_section
))
10689 /* Get the name of the symbol. */
10690 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10695 /* See if we are discarding symbols with this name. */
10696 if ((flinfo
->info
->strip
== strip_some
10697 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
10699 || (((flinfo
->info
->discard
== discard_sec_merge
10700 && (isec
->flags
& SEC_MERGE
)
10701 && !bfd_link_relocatable (flinfo
->info
))
10702 || flinfo
->info
->discard
== discard_l
)
10703 && bfd_is_local_label_name (input_bfd
, name
)))
10706 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10708 if (input_bfd
->lto_output
)
10709 /* -flto puts a temp file name here. This means builds
10710 are not reproducible. Discard the symbol. */
10712 have_file_sym
= TRUE
;
10713 flinfo
->filesym_count
+= 1;
10715 if (!have_file_sym
)
10717 /* In the absence of debug info, bfd_find_nearest_line uses
10718 FILE symbols to determine the source file for local
10719 function symbols. Provide a FILE symbol here if input
10720 files lack such, so that their symbols won't be
10721 associated with a previous input file. It's not the
10722 source file, but the best we can do. */
10723 have_file_sym
= TRUE
;
10724 flinfo
->filesym_count
+= 1;
10725 memset (&osym
, 0, sizeof (osym
));
10726 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10727 osym
.st_shndx
= SHN_ABS
;
10728 if (!elf_link_output_symstrtab (flinfo
,
10729 (input_bfd
->lto_output
? NULL
10730 : bfd_get_filename (input_bfd
)),
10731 &osym
, bfd_abs_section_ptr
,
10738 /* Adjust the section index for the output file. */
10739 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10740 isec
->output_section
);
10741 if (osym
.st_shndx
== SHN_BAD
)
10744 /* ELF symbols in relocatable files are section relative, but
10745 in executable files they are virtual addresses. Note that
10746 this code assumes that all ELF sections have an associated
10747 BFD section with a reasonable value for output_offset; below
10748 we assume that they also have a reasonable value for
10749 output_section. Any special sections must be set up to meet
10750 these requirements. */
10751 osym
.st_value
+= isec
->output_offset
;
10752 if (!bfd_link_relocatable (flinfo
->info
))
10754 osym
.st_value
+= isec
->output_section
->vma
;
10755 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
10757 /* STT_TLS symbols are relative to PT_TLS segment base. */
10758 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
10759 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
10761 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
10766 indx
= bfd_get_symcount (output_bfd
);
10767 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
10774 if (bed
->s
->arch_size
== 32)
10776 r_type_mask
= 0xff;
10782 r_type_mask
= 0xffffffff;
10787 /* Relocate the contents of each section. */
10788 sym_hashes
= elf_sym_hashes (input_bfd
);
10789 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
10791 bfd_byte
*contents
;
10793 if (! o
->linker_mark
)
10795 /* This section was omitted from the link. */
10799 if (!flinfo
->info
->resolve_section_groups
10800 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
10802 /* Deal with the group signature symbol. */
10803 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
10804 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
10805 asection
*osec
= o
->output_section
;
10807 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
10808 if (symndx
>= locsymcount
10809 || (elf_bad_symtab (input_bfd
)
10810 && flinfo
->sections
[symndx
] == NULL
))
10812 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
10813 while (h
->root
.type
== bfd_link_hash_indirect
10814 || h
->root
.type
== bfd_link_hash_warning
)
10815 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10816 /* Arrange for symbol to be output. */
10818 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
10820 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
10822 /* We'll use the output section target_index. */
10823 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10824 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
10828 if (flinfo
->indices
[symndx
] == -1)
10830 /* Otherwise output the local symbol now. */
10831 Elf_Internal_Sym sym
= isymbuf
[symndx
];
10832 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10837 name
= bfd_elf_string_from_elf_section (input_bfd
,
10838 symtab_hdr
->sh_link
,
10843 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10845 if (sym
.st_shndx
== SHN_BAD
)
10848 sym
.st_value
+= o
->output_offset
;
10850 indx
= bfd_get_symcount (output_bfd
);
10851 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
10856 flinfo
->indices
[symndx
] = indx
;
10860 elf_section_data (osec
)->this_hdr
.sh_info
10861 = flinfo
->indices
[symndx
];
10865 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10866 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
10869 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
10871 /* Section was created by _bfd_elf_link_create_dynamic_sections
10876 /* Get the contents of the section. They have been cached by a
10877 relaxation routine. Note that o is a section in an input
10878 file, so the contents field will not have been set by any of
10879 the routines which work on output files. */
10880 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
10882 contents
= elf_section_data (o
)->this_hdr
.contents
;
10883 if (bed
->caches_rawsize
10885 && o
->rawsize
< o
->size
)
10887 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
10888 contents
= flinfo
->contents
;
10893 contents
= flinfo
->contents
;
10894 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
10898 if ((o
->flags
& SEC_RELOC
) != 0)
10900 Elf_Internal_Rela
*internal_relocs
;
10901 Elf_Internal_Rela
*rel
, *relend
;
10902 int action_discarded
;
10905 /* Get the swapped relocs. */
10907 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
10908 flinfo
->internal_relocs
, FALSE
);
10909 if (internal_relocs
== NULL
10910 && o
->reloc_count
> 0)
10913 /* We need to reverse-copy input .ctors/.dtors sections if
10914 they are placed in .init_array/.finit_array for output. */
10915 if (o
->size
> address_size
10916 && ((strncmp (o
->name
, ".ctors", 6) == 0
10917 && strcmp (o
->output_section
->name
,
10918 ".init_array") == 0)
10919 || (strncmp (o
->name
, ".dtors", 6) == 0
10920 && strcmp (o
->output_section
->name
,
10921 ".fini_array") == 0))
10922 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
10924 if (o
->size
* bed
->s
->int_rels_per_ext_rel
10925 != o
->reloc_count
* address_size
)
10928 /* xgettext:c-format */
10929 (_("error: %pB: size of section %pA is not "
10930 "multiple of address size"),
10932 bfd_set_error (bfd_error_bad_value
);
10935 o
->flags
|= SEC_ELF_REVERSE_COPY
;
10938 action_discarded
= -1;
10939 if (!elf_section_ignore_discarded_relocs (o
))
10940 action_discarded
= (*bed
->action_discarded
) (o
);
10942 /* Run through the relocs evaluating complex reloc symbols and
10943 looking for relocs against symbols from discarded sections
10944 or section symbols from removed link-once sections.
10945 Complain about relocs against discarded sections. Zero
10946 relocs against removed link-once sections. */
10948 rel
= internal_relocs
;
10949 relend
= rel
+ o
->reloc_count
;
10950 for ( ; rel
< relend
; rel
++)
10952 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
10953 unsigned int s_type
;
10954 asection
**ps
, *sec
;
10955 struct elf_link_hash_entry
*h
= NULL
;
10956 const char *sym_name
;
10958 if (r_symndx
== STN_UNDEF
)
10961 if (r_symndx
>= locsymcount
10962 || (elf_bad_symtab (input_bfd
)
10963 && flinfo
->sections
[r_symndx
] == NULL
))
10965 h
= sym_hashes
[r_symndx
- extsymoff
];
10967 /* Badly formatted input files can contain relocs that
10968 reference non-existant symbols. Check here so that
10969 we do not seg fault. */
10973 /* xgettext:c-format */
10974 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
10975 "that references a non-existent global symbol"),
10976 input_bfd
, (uint64_t) rel
->r_info
, o
);
10977 bfd_set_error (bfd_error_bad_value
);
10981 while (h
->root
.type
== bfd_link_hash_indirect
10982 || h
->root
.type
== bfd_link_hash_warning
)
10983 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10987 /* If a plugin symbol is referenced from a non-IR file,
10988 mark the symbol as undefined. Note that the
10989 linker may attach linker created dynamic sections
10990 to the plugin bfd. Symbols defined in linker
10991 created sections are not plugin symbols. */
10992 if ((h
->root
.non_ir_ref_regular
10993 || h
->root
.non_ir_ref_dynamic
)
10994 && (h
->root
.type
== bfd_link_hash_defined
10995 || h
->root
.type
== bfd_link_hash_defweak
)
10996 && (h
->root
.u
.def
.section
->flags
10997 & SEC_LINKER_CREATED
) == 0
10998 && h
->root
.u
.def
.section
->owner
!= NULL
10999 && (h
->root
.u
.def
.section
->owner
->flags
11000 & BFD_PLUGIN
) != 0)
11002 h
->root
.type
= bfd_link_hash_undefined
;
11003 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11007 if (h
->root
.type
== bfd_link_hash_defined
11008 || h
->root
.type
== bfd_link_hash_defweak
)
11009 ps
= &h
->root
.u
.def
.section
;
11011 sym_name
= h
->root
.root
.string
;
11015 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11017 s_type
= ELF_ST_TYPE (sym
->st_info
);
11018 ps
= &flinfo
->sections
[r_symndx
];
11019 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11023 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11024 && !bfd_link_relocatable (flinfo
->info
))
11027 bfd_vma dot
= (rel
->r_offset
11028 + o
->output_offset
+ o
->output_section
->vma
);
11030 printf ("Encountered a complex symbol!");
11031 printf (" (input_bfd %s, section %s, reloc %ld\n",
11032 bfd_get_filename (input_bfd
), o
->name
,
11033 (long) (rel
- internal_relocs
));
11034 printf (" symbol: idx %8.8lx, name %s\n",
11035 r_symndx
, sym_name
);
11036 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11037 (unsigned long) rel
->r_info
,
11038 (unsigned long) rel
->r_offset
);
11040 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11041 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11044 /* Symbol evaluated OK. Update to absolute value. */
11045 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11050 if (action_discarded
!= -1 && ps
!= NULL
)
11052 /* Complain if the definition comes from a
11053 discarded section. */
11054 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11056 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11057 if (action_discarded
& COMPLAIN
)
11058 (*flinfo
->info
->callbacks
->einfo
)
11059 /* xgettext:c-format */
11060 (_("%X`%s' referenced in section `%pA' of %pB: "
11061 "defined in discarded section `%pA' of %pB\n"),
11062 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11064 /* Try to do the best we can to support buggy old
11065 versions of gcc. Pretend that the symbol is
11066 really defined in the kept linkonce section.
11067 FIXME: This is quite broken. Modifying the
11068 symbol here means we will be changing all later
11069 uses of the symbol, not just in this section. */
11070 if (action_discarded
& PRETEND
)
11074 kept
= _bfd_elf_check_kept_section (sec
,
11086 /* Relocate the section by invoking a back end routine.
11088 The back end routine is responsible for adjusting the
11089 section contents as necessary, and (if using Rela relocs
11090 and generating a relocatable output file) adjusting the
11091 reloc addend as necessary.
11093 The back end routine does not have to worry about setting
11094 the reloc address or the reloc symbol index.
11096 The back end routine is given a pointer to the swapped in
11097 internal symbols, and can access the hash table entries
11098 for the external symbols via elf_sym_hashes (input_bfd).
11100 When generating relocatable output, the back end routine
11101 must handle STB_LOCAL/STT_SECTION symbols specially. The
11102 output symbol is going to be a section symbol
11103 corresponding to the output section, which will require
11104 the addend to be adjusted. */
11106 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11107 input_bfd
, o
, contents
,
11115 || bfd_link_relocatable (flinfo
->info
)
11116 || flinfo
->info
->emitrelocations
)
11118 Elf_Internal_Rela
*irela
;
11119 Elf_Internal_Rela
*irelaend
, *irelamid
;
11120 bfd_vma last_offset
;
11121 struct elf_link_hash_entry
**rel_hash
;
11122 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11123 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11124 unsigned int next_erel
;
11125 bfd_boolean rela_normal
;
11126 struct bfd_elf_section_data
*esdi
, *esdo
;
11128 esdi
= elf_section_data (o
);
11129 esdo
= elf_section_data (o
->output_section
);
11130 rela_normal
= FALSE
;
11132 /* Adjust the reloc addresses and symbol indices. */
11134 irela
= internal_relocs
;
11135 irelaend
= irela
+ o
->reloc_count
;
11136 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11137 /* We start processing the REL relocs, if any. When we reach
11138 IRELAMID in the loop, we switch to the RELA relocs. */
11140 if (esdi
->rel
.hdr
!= NULL
)
11141 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11142 * bed
->s
->int_rels_per_ext_rel
);
11143 rel_hash_list
= rel_hash
;
11144 rela_hash_list
= NULL
;
11145 last_offset
= o
->output_offset
;
11146 if (!bfd_link_relocatable (flinfo
->info
))
11147 last_offset
+= o
->output_section
->vma
;
11148 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11150 unsigned long r_symndx
;
11152 Elf_Internal_Sym sym
;
11154 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11160 if (irela
== irelamid
)
11162 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11163 rela_hash_list
= rel_hash
;
11164 rela_normal
= bed
->rela_normal
;
11167 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11170 if (irela
->r_offset
>= (bfd_vma
) -2)
11172 /* This is a reloc for a deleted entry or somesuch.
11173 Turn it into an R_*_NONE reloc, at the same
11174 offset as the last reloc. elf_eh_frame.c and
11175 bfd_elf_discard_info rely on reloc offsets
11177 irela
->r_offset
= last_offset
;
11179 irela
->r_addend
= 0;
11183 irela
->r_offset
+= o
->output_offset
;
11185 /* Relocs in an executable have to be virtual addresses. */
11186 if (!bfd_link_relocatable (flinfo
->info
))
11187 irela
->r_offset
+= o
->output_section
->vma
;
11189 last_offset
= irela
->r_offset
;
11191 r_symndx
= irela
->r_info
>> r_sym_shift
;
11192 if (r_symndx
== STN_UNDEF
)
11195 if (r_symndx
>= locsymcount
11196 || (elf_bad_symtab (input_bfd
)
11197 && flinfo
->sections
[r_symndx
] == NULL
))
11199 struct elf_link_hash_entry
*rh
;
11200 unsigned long indx
;
11202 /* This is a reloc against a global symbol. We
11203 have not yet output all the local symbols, so
11204 we do not know the symbol index of any global
11205 symbol. We set the rel_hash entry for this
11206 reloc to point to the global hash table entry
11207 for this symbol. The symbol index is then
11208 set at the end of bfd_elf_final_link. */
11209 indx
= r_symndx
- extsymoff
;
11210 rh
= elf_sym_hashes (input_bfd
)[indx
];
11211 while (rh
->root
.type
== bfd_link_hash_indirect
11212 || rh
->root
.type
== bfd_link_hash_warning
)
11213 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11215 /* Setting the index to -2 tells
11216 elf_link_output_extsym that this symbol is
11217 used by a reloc. */
11218 BFD_ASSERT (rh
->indx
< 0);
11225 /* This is a reloc against a local symbol. */
11228 sym
= isymbuf
[r_symndx
];
11229 sec
= flinfo
->sections
[r_symndx
];
11230 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11232 /* I suppose the backend ought to fill in the
11233 section of any STT_SECTION symbol against a
11234 processor specific section. */
11235 r_symndx
= STN_UNDEF
;
11236 if (bfd_is_abs_section (sec
))
11238 else if (sec
== NULL
|| sec
->owner
== NULL
)
11240 bfd_set_error (bfd_error_bad_value
);
11245 asection
*osec
= sec
->output_section
;
11247 /* If we have discarded a section, the output
11248 section will be the absolute section. In
11249 case of discarded SEC_MERGE sections, use
11250 the kept section. relocate_section should
11251 have already handled discarded linkonce
11253 if (bfd_is_abs_section (osec
)
11254 && sec
->kept_section
!= NULL
11255 && sec
->kept_section
->output_section
!= NULL
)
11257 osec
= sec
->kept_section
->output_section
;
11258 irela
->r_addend
-= osec
->vma
;
11261 if (!bfd_is_abs_section (osec
))
11263 r_symndx
= osec
->target_index
;
11264 if (r_symndx
== STN_UNDEF
)
11266 irela
->r_addend
+= osec
->vma
;
11267 osec
= _bfd_nearby_section (output_bfd
, osec
,
11269 irela
->r_addend
-= osec
->vma
;
11270 r_symndx
= osec
->target_index
;
11275 /* Adjust the addend according to where the
11276 section winds up in the output section. */
11278 irela
->r_addend
+= sec
->output_offset
;
11282 if (flinfo
->indices
[r_symndx
] == -1)
11284 unsigned long shlink
;
11289 if (flinfo
->info
->strip
== strip_all
)
11291 /* You can't do ld -r -s. */
11292 bfd_set_error (bfd_error_invalid_operation
);
11296 /* This symbol was skipped earlier, but
11297 since it is needed by a reloc, we
11298 must output it now. */
11299 shlink
= symtab_hdr
->sh_link
;
11300 name
= (bfd_elf_string_from_elf_section
11301 (input_bfd
, shlink
, sym
.st_name
));
11305 osec
= sec
->output_section
;
11307 _bfd_elf_section_from_bfd_section (output_bfd
,
11309 if (sym
.st_shndx
== SHN_BAD
)
11312 sym
.st_value
+= sec
->output_offset
;
11313 if (!bfd_link_relocatable (flinfo
->info
))
11315 sym
.st_value
+= osec
->vma
;
11316 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11318 struct elf_link_hash_table
*htab
11319 = elf_hash_table (flinfo
->info
);
11321 /* STT_TLS symbols are relative to PT_TLS
11323 if (htab
->tls_sec
!= NULL
)
11324 sym
.st_value
-= htab
->tls_sec
->vma
;
11327 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11332 indx
= bfd_get_symcount (output_bfd
);
11333 ret
= elf_link_output_symstrtab (flinfo
, name
,
11339 flinfo
->indices
[r_symndx
] = indx
;
11344 r_symndx
= flinfo
->indices
[r_symndx
];
11347 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11348 | (irela
->r_info
& r_type_mask
));
11351 /* Swap out the relocs. */
11352 input_rel_hdr
= esdi
->rel
.hdr
;
11353 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11355 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11360 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11361 * bed
->s
->int_rels_per_ext_rel
);
11362 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11365 input_rela_hdr
= esdi
->rela
.hdr
;
11366 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11368 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11377 /* Write out the modified section contents. */
11378 if (bed
->elf_backend_write_section
11379 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11382 /* Section written out. */
11384 else switch (o
->sec_info_type
)
11386 case SEC_INFO_TYPE_STABS
:
11387 if (! (_bfd_write_section_stabs
11389 &elf_hash_table (flinfo
->info
)->stab_info
,
11390 o
, &elf_section_data (o
)->sec_info
, contents
)))
11393 case SEC_INFO_TYPE_MERGE
:
11394 if (! _bfd_write_merged_section (output_bfd
, o
,
11395 elf_section_data (o
)->sec_info
))
11398 case SEC_INFO_TYPE_EH_FRAME
:
11400 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11405 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11407 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11415 if (! (o
->flags
& SEC_EXCLUDE
))
11417 file_ptr offset
= (file_ptr
) o
->output_offset
;
11418 bfd_size_type todo
= o
->size
;
11420 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11422 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11424 /* Reverse-copy input section to output. */
11427 todo
-= address_size
;
11428 if (! bfd_set_section_contents (output_bfd
,
11436 offset
+= address_size
;
11440 else if (! bfd_set_section_contents (output_bfd
,
11454 /* Generate a reloc when linking an ELF file. This is a reloc
11455 requested by the linker, and does not come from any input file. This
11456 is used to build constructor and destructor tables when linking
11460 elf_reloc_link_order (bfd
*output_bfd
,
11461 struct bfd_link_info
*info
,
11462 asection
*output_section
,
11463 struct bfd_link_order
*link_order
)
11465 reloc_howto_type
*howto
;
11469 struct bfd_elf_section_reloc_data
*reldata
;
11470 struct elf_link_hash_entry
**rel_hash_ptr
;
11471 Elf_Internal_Shdr
*rel_hdr
;
11472 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11473 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11476 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11478 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11481 bfd_set_error (bfd_error_bad_value
);
11485 addend
= link_order
->u
.reloc
.p
->addend
;
11488 reldata
= &esdo
->rel
;
11489 else if (esdo
->rela
.hdr
)
11490 reldata
= &esdo
->rela
;
11497 /* Figure out the symbol index. */
11498 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11499 if (link_order
->type
== bfd_section_reloc_link_order
)
11501 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11502 BFD_ASSERT (indx
!= 0);
11503 *rel_hash_ptr
= NULL
;
11507 struct elf_link_hash_entry
*h
;
11509 /* Treat a reloc against a defined symbol as though it were
11510 actually against the section. */
11511 h
= ((struct elf_link_hash_entry
*)
11512 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11513 link_order
->u
.reloc
.p
->u
.name
,
11514 FALSE
, FALSE
, TRUE
));
11516 && (h
->root
.type
== bfd_link_hash_defined
11517 || h
->root
.type
== bfd_link_hash_defweak
))
11521 section
= h
->root
.u
.def
.section
;
11522 indx
= section
->output_section
->target_index
;
11523 *rel_hash_ptr
= NULL
;
11524 /* It seems that we ought to add the symbol value to the
11525 addend here, but in practice it has already been added
11526 because it was passed to constructor_callback. */
11527 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11529 else if (h
!= NULL
)
11531 /* Setting the index to -2 tells elf_link_output_extsym that
11532 this symbol is used by a reloc. */
11539 (*info
->callbacks
->unattached_reloc
)
11540 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11545 /* If this is an inplace reloc, we must write the addend into the
11547 if (howto
->partial_inplace
&& addend
!= 0)
11549 bfd_size_type size
;
11550 bfd_reloc_status_type rstat
;
11553 const char *sym_name
;
11554 bfd_size_type octets
;
11556 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11557 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11558 if (buf
== NULL
&& size
!= 0)
11560 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11567 case bfd_reloc_outofrange
:
11570 case bfd_reloc_overflow
:
11571 if (link_order
->type
== bfd_section_reloc_link_order
)
11572 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11574 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11575 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11576 howto
->name
, addend
, NULL
, NULL
,
11581 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11583 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11590 /* The address of a reloc is relative to the section in a
11591 relocatable file, and is a virtual address in an executable
11593 offset
= link_order
->offset
;
11594 if (! bfd_link_relocatable (info
))
11595 offset
+= output_section
->vma
;
11597 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11599 irel
[i
].r_offset
= offset
;
11600 irel
[i
].r_info
= 0;
11601 irel
[i
].r_addend
= 0;
11603 if (bed
->s
->arch_size
== 32)
11604 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11606 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11608 rel_hdr
= reldata
->hdr
;
11609 erel
= rel_hdr
->contents
;
11610 if (rel_hdr
->sh_type
== SHT_REL
)
11612 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11613 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11617 irel
[0].r_addend
= addend
;
11618 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11619 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11628 /* Compare two sections based on the locations of the sections they are
11629 linked to. Used by elf_fixup_link_order. */
11632 compare_link_order (const void *a
, const void *b
)
11634 const struct bfd_link_order
*alo
= *(const struct bfd_link_order
**) a
;
11635 const struct bfd_link_order
*blo
= *(const struct bfd_link_order
**) b
;
11636 asection
*asec
= elf_linked_to_section (alo
->u
.indirect
.section
);
11637 asection
*bsec
= elf_linked_to_section (blo
->u
.indirect
.section
);
11638 bfd_vma apos
= asec
->output_section
->lma
+ asec
->output_offset
;
11639 bfd_vma bpos
= bsec
->output_section
->lma
+ bsec
->output_offset
;
11646 /* The only way we should get matching LMAs is when the first of two
11647 sections has zero size. */
11648 if (asec
->size
< bsec
->size
)
11650 if (asec
->size
> bsec
->size
)
11653 /* If they are both zero size then they almost certainly have the same
11654 VMA and thus are not ordered with respect to each other. Test VMA
11655 anyway, and fall back to id to make the result reproducible across
11656 qsort implementations. */
11657 apos
= asec
->output_section
->vma
+ asec
->output_offset
;
11658 bpos
= bsec
->output_section
->vma
+ bsec
->output_offset
;
11664 return asec
->id
- bsec
->id
;
11668 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
11669 order as their linked sections. Returns false if this could not be done
11670 because an output section includes both ordered and unordered
11671 sections. Ideally we'd do this in the linker proper. */
11674 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
11676 size_t seen_linkorder
;
11679 struct bfd_link_order
*p
;
11681 struct bfd_link_order
**sections
;
11682 asection
*other_sec
, *linkorder_sec
;
11683 bfd_vma offset
; /* Octets. */
11686 linkorder_sec
= NULL
;
11688 seen_linkorder
= 0;
11689 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11691 if (p
->type
== bfd_indirect_link_order
)
11693 asection
*s
= p
->u
.indirect
.section
;
11695 if ((s
->flags
& SEC_LINKER_CREATED
) == 0
11696 && bfd_get_flavour (sub
) == bfd_target_elf_flavour
11697 && elf_section_data (s
) != NULL
11698 && elf_linked_to_section (s
) != NULL
)
11712 if (seen_other
&& seen_linkorder
)
11714 if (other_sec
&& linkorder_sec
)
11716 /* xgettext:c-format */
11717 (_("%pA has both ordered [`%pA' in %pB] "
11718 "and unordered [`%pA' in %pB] sections"),
11719 o
, linkorder_sec
, linkorder_sec
->owner
,
11720 other_sec
, other_sec
->owner
);
11723 (_("%pA has both ordered and unordered sections"), o
);
11724 bfd_set_error (bfd_error_bad_value
);
11729 if (!seen_linkorder
)
11732 sections
= bfd_malloc (seen_linkorder
* sizeof (*sections
));
11733 if (sections
== NULL
)
11736 seen_linkorder
= 0;
11737 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11738 sections
[seen_linkorder
++] = p
;
11740 /* Sort the input sections in the order of their linked section. */
11741 qsort (sections
, seen_linkorder
, sizeof (*sections
), compare_link_order
);
11743 /* Change the offsets of the sections. */
11745 for (n
= 0; n
< seen_linkorder
; n
++)
11748 asection
*s
= sections
[n
]->u
.indirect
.section
;
11749 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
11751 mask
= ~(bfd_vma
) 0 << s
->alignment_power
* opb
;
11752 offset
= (offset
+ ~mask
) & mask
;
11753 sections
[n
]->offset
= s
->output_offset
= offset
/ opb
;
11754 offset
+= sections
[n
]->size
;
11761 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11762 Returns TRUE upon success, FALSE otherwise. */
11765 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11767 bfd_boolean ret
= FALSE
;
11769 const struct elf_backend_data
*bed
;
11771 enum bfd_architecture arch
;
11773 asymbol
**sympp
= NULL
;
11777 elf_symbol_type
*osymbuf
;
11780 implib_bfd
= info
->out_implib_bfd
;
11781 bed
= get_elf_backend_data (abfd
);
11783 if (!bfd_set_format (implib_bfd
, bfd_object
))
11786 /* Use flag from executable but make it a relocatable object. */
11787 flags
= bfd_get_file_flags (abfd
);
11788 flags
&= ~HAS_RELOC
;
11789 if (!bfd_set_start_address (implib_bfd
, 0)
11790 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11793 /* Copy architecture of output file to import library file. */
11794 arch
= bfd_get_arch (abfd
);
11795 mach
= bfd_get_mach (abfd
);
11796 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11797 && (abfd
->target_defaulted
11798 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11801 /* Get symbol table size. */
11802 symsize
= bfd_get_symtab_upper_bound (abfd
);
11806 /* Read in the symbol table. */
11807 sympp
= (asymbol
**) bfd_malloc (symsize
);
11811 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11815 /* Allow the BFD backend to copy any private header data it
11816 understands from the output BFD to the import library BFD. */
11817 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11820 /* Filter symbols to appear in the import library. */
11821 if (bed
->elf_backend_filter_implib_symbols
)
11822 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11825 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11828 bfd_set_error (bfd_error_no_symbols
);
11829 _bfd_error_handler (_("%pB: no symbol found for import library"),
11835 /* Make symbols absolute. */
11836 amt
= symcount
* sizeof (*osymbuf
);
11837 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11838 if (osymbuf
== NULL
)
11841 for (src_count
= 0; src_count
< symcount
; src_count
++)
11843 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11844 sizeof (*osymbuf
));
11845 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11846 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11847 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11848 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11849 osymbuf
[src_count
].symbol
.value
;
11850 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11853 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
11855 /* Allow the BFD backend to copy any private data it understands
11856 from the output BFD to the import library BFD. This is done last
11857 to permit the routine to look at the filtered symbol table. */
11858 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
11861 if (!bfd_close (implib_bfd
))
11872 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
11876 if (flinfo
->symstrtab
!= NULL
)
11877 _bfd_elf_strtab_free (flinfo
->symstrtab
);
11878 if (flinfo
->contents
!= NULL
)
11879 free (flinfo
->contents
);
11880 if (flinfo
->external_relocs
!= NULL
)
11881 free (flinfo
->external_relocs
);
11882 if (flinfo
->internal_relocs
!= NULL
)
11883 free (flinfo
->internal_relocs
);
11884 if (flinfo
->external_syms
!= NULL
)
11885 free (flinfo
->external_syms
);
11886 if (flinfo
->locsym_shndx
!= NULL
)
11887 free (flinfo
->locsym_shndx
);
11888 if (flinfo
->internal_syms
!= NULL
)
11889 free (flinfo
->internal_syms
);
11890 if (flinfo
->indices
!= NULL
)
11891 free (flinfo
->indices
);
11892 if (flinfo
->sections
!= NULL
)
11893 free (flinfo
->sections
);
11894 if (flinfo
->symshndxbuf
!= NULL
11895 && flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
11896 free (flinfo
->symshndxbuf
);
11897 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
11899 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11900 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11901 free (esdo
->rel
.hashes
);
11902 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11903 free (esdo
->rela
.hashes
);
11907 /* Do the final step of an ELF link. */
11910 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
11912 bfd_boolean dynamic
;
11913 bfd_boolean emit_relocs
;
11915 struct elf_final_link_info flinfo
;
11917 struct bfd_link_order
*p
;
11919 bfd_size_type max_contents_size
;
11920 bfd_size_type max_external_reloc_size
;
11921 bfd_size_type max_internal_reloc_count
;
11922 bfd_size_type max_sym_count
;
11923 bfd_size_type max_sym_shndx_count
;
11924 Elf_Internal_Sym elfsym
;
11926 Elf_Internal_Shdr
*symtab_hdr
;
11927 Elf_Internal_Shdr
*symtab_shndx_hdr
;
11928 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11929 struct elf_outext_info eoinfo
;
11930 bfd_boolean merged
;
11931 size_t relativecount
= 0;
11932 asection
*reldyn
= 0;
11934 asection
*attr_section
= NULL
;
11935 bfd_vma attr_size
= 0;
11936 const char *std_attrs_section
;
11937 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
11938 bfd_boolean sections_removed
;
11940 if (!is_elf_hash_table (htab
))
11943 if (bfd_link_pic (info
))
11944 abfd
->flags
|= DYNAMIC
;
11946 dynamic
= htab
->dynamic_sections_created
;
11947 dynobj
= htab
->dynobj
;
11949 emit_relocs
= (bfd_link_relocatable (info
)
11950 || info
->emitrelocations
);
11952 flinfo
.info
= info
;
11953 flinfo
.output_bfd
= abfd
;
11954 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
11955 if (flinfo
.symstrtab
== NULL
)
11960 flinfo
.hash_sec
= NULL
;
11961 flinfo
.symver_sec
= NULL
;
11965 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
11966 /* Note that dynsym_sec can be NULL (on VMS). */
11967 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
11968 /* Note that it is OK if symver_sec is NULL. */
11971 flinfo
.contents
= NULL
;
11972 flinfo
.external_relocs
= NULL
;
11973 flinfo
.internal_relocs
= NULL
;
11974 flinfo
.external_syms
= NULL
;
11975 flinfo
.locsym_shndx
= NULL
;
11976 flinfo
.internal_syms
= NULL
;
11977 flinfo
.indices
= NULL
;
11978 flinfo
.sections
= NULL
;
11979 flinfo
.symshndxbuf
= NULL
;
11980 flinfo
.filesym_count
= 0;
11982 /* The object attributes have been merged. Remove the input
11983 sections from the link, and set the contents of the output
11985 sections_removed
= FALSE
;
11986 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
11987 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11989 bfd_boolean remove_section
= FALSE
;
11991 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
11992 || strcmp (o
->name
, ".gnu.attributes") == 0)
11994 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11996 asection
*input_section
;
11998 if (p
->type
!= bfd_indirect_link_order
)
12000 input_section
= p
->u
.indirect
.section
;
12001 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12002 elf_link_input_bfd ignores this section. */
12003 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12006 attr_size
= bfd_elf_obj_attr_size (abfd
);
12007 bfd_set_section_size (o
, attr_size
);
12008 /* Skip this section later on. */
12009 o
->map_head
.link_order
= NULL
;
12013 remove_section
= TRUE
;
12015 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12017 /* Remove empty group section from linker output. */
12018 remove_section
= TRUE
;
12020 if (remove_section
)
12022 o
->flags
|= SEC_EXCLUDE
;
12023 bfd_section_list_remove (abfd
, o
);
12024 abfd
->section_count
--;
12025 sections_removed
= TRUE
;
12028 if (sections_removed
)
12029 _bfd_fix_excluded_sec_syms (abfd
, info
);
12031 /* Count up the number of relocations we will output for each output
12032 section, so that we know the sizes of the reloc sections. We
12033 also figure out some maximum sizes. */
12034 max_contents_size
= 0;
12035 max_external_reloc_size
= 0;
12036 max_internal_reloc_count
= 0;
12038 max_sym_shndx_count
= 0;
12040 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12042 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12043 o
->reloc_count
= 0;
12045 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12047 unsigned int reloc_count
= 0;
12048 unsigned int additional_reloc_count
= 0;
12049 struct bfd_elf_section_data
*esdi
= NULL
;
12051 if (p
->type
== bfd_section_reloc_link_order
12052 || p
->type
== bfd_symbol_reloc_link_order
)
12054 else if (p
->type
== bfd_indirect_link_order
)
12058 sec
= p
->u
.indirect
.section
;
12060 /* Mark all sections which are to be included in the
12061 link. This will normally be every section. We need
12062 to do this so that we can identify any sections which
12063 the linker has decided to not include. */
12064 sec
->linker_mark
= TRUE
;
12066 if (sec
->flags
& SEC_MERGE
)
12069 if (sec
->rawsize
> max_contents_size
)
12070 max_contents_size
= sec
->rawsize
;
12071 if (sec
->size
> max_contents_size
)
12072 max_contents_size
= sec
->size
;
12074 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12075 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12079 /* We are interested in just local symbols, not all
12081 if (elf_bad_symtab (sec
->owner
))
12082 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12083 / bed
->s
->sizeof_sym
);
12085 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12087 if (sym_count
> max_sym_count
)
12088 max_sym_count
= sym_count
;
12090 if (sym_count
> max_sym_shndx_count
12091 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12092 max_sym_shndx_count
= sym_count
;
12094 if (esdo
->this_hdr
.sh_type
== SHT_REL
12095 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12096 /* Some backends use reloc_count in relocation sections
12097 to count particular types of relocs. Of course,
12098 reloc sections themselves can't have relocations. */
12100 else if (emit_relocs
)
12102 reloc_count
= sec
->reloc_count
;
12103 if (bed
->elf_backend_count_additional_relocs
)
12106 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12107 additional_reloc_count
+= c
;
12110 else if (bed
->elf_backend_count_relocs
)
12111 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12113 esdi
= elf_section_data (sec
);
12115 if ((sec
->flags
& SEC_RELOC
) != 0)
12117 size_t ext_size
= 0;
12119 if (esdi
->rel
.hdr
!= NULL
)
12120 ext_size
= esdi
->rel
.hdr
->sh_size
;
12121 if (esdi
->rela
.hdr
!= NULL
)
12122 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12124 if (ext_size
> max_external_reloc_size
)
12125 max_external_reloc_size
= ext_size
;
12126 if (sec
->reloc_count
> max_internal_reloc_count
)
12127 max_internal_reloc_count
= sec
->reloc_count
;
12132 if (reloc_count
== 0)
12135 reloc_count
+= additional_reloc_count
;
12136 o
->reloc_count
+= reloc_count
;
12138 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12142 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12143 esdo
->rel
.count
+= additional_reloc_count
;
12145 if (esdi
->rela
.hdr
)
12147 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12148 esdo
->rela
.count
+= additional_reloc_count
;
12154 esdo
->rela
.count
+= reloc_count
;
12156 esdo
->rel
.count
+= reloc_count
;
12160 if (o
->reloc_count
> 0)
12161 o
->flags
|= SEC_RELOC
;
12164 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12165 set it (this is probably a bug) and if it is set
12166 assign_section_numbers will create a reloc section. */
12167 o
->flags
&=~ SEC_RELOC
;
12170 /* If the SEC_ALLOC flag is not set, force the section VMA to
12171 zero. This is done in elf_fake_sections as well, but forcing
12172 the VMA to 0 here will ensure that relocs against these
12173 sections are handled correctly. */
12174 if ((o
->flags
& SEC_ALLOC
) == 0
12175 && ! o
->user_set_vma
)
12179 if (! bfd_link_relocatable (info
) && merged
)
12180 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12182 /* Figure out the file positions for everything but the symbol table
12183 and the relocs. We set symcount to force assign_section_numbers
12184 to create a symbol table. */
12185 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12186 BFD_ASSERT (! abfd
->output_has_begun
);
12187 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12190 /* Set sizes, and assign file positions for reloc sections. */
12191 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12193 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12194 if ((o
->flags
& SEC_RELOC
) != 0)
12197 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12201 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12205 /* _bfd_elf_compute_section_file_positions makes temporary use
12206 of target_index. Reset it. */
12207 o
->target_index
= 0;
12209 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12210 to count upwards while actually outputting the relocations. */
12211 esdo
->rel
.count
= 0;
12212 esdo
->rela
.count
= 0;
12214 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12215 && !bfd_section_is_ctf (o
))
12217 /* Cache the section contents so that they can be compressed
12218 later. Use bfd_malloc since it will be freed by
12219 bfd_compress_section_contents. */
12220 unsigned char *contents
= esdo
->this_hdr
.contents
;
12221 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12224 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12225 if (contents
== NULL
)
12227 esdo
->this_hdr
.contents
= contents
;
12231 /* We have now assigned file positions for all the sections except .symtab,
12232 .strtab, and non-loaded reloc and compressed debugging sections. We start
12233 the .symtab section at the current file position, and write directly to it.
12234 We build the .strtab section in memory. */
12235 abfd
->symcount
= 0;
12236 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12237 /* sh_name is set in prep_headers. */
12238 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12239 /* sh_flags, sh_addr and sh_size all start off zero. */
12240 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12241 /* sh_link is set in assign_section_numbers. */
12242 /* sh_info is set below. */
12243 /* sh_offset is set just below. */
12244 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12246 if (max_sym_count
< 20)
12247 max_sym_count
= 20;
12248 htab
->strtabsize
= max_sym_count
;
12249 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12250 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12251 if (htab
->strtab
== NULL
)
12253 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12255 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12256 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12258 if (info
->strip
!= strip_all
|| emit_relocs
)
12260 file_ptr off
= elf_next_file_pos (abfd
);
12262 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
12264 /* Note that at this point elf_next_file_pos (abfd) is
12265 incorrect. We do not yet know the size of the .symtab section.
12266 We correct next_file_pos below, after we do know the size. */
12268 /* Start writing out the symbol table. The first symbol is always a
12270 elfsym
.st_value
= 0;
12271 elfsym
.st_size
= 0;
12272 elfsym
.st_info
= 0;
12273 elfsym
.st_other
= 0;
12274 elfsym
.st_shndx
= SHN_UNDEF
;
12275 elfsym
.st_target_internal
= 0;
12276 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12277 bfd_und_section_ptr
, NULL
) != 1)
12280 /* Output a symbol for each section. We output these even if we are
12281 discarding local symbols, since they are used for relocs. These
12282 symbols have no names. We store the index of each one in the
12283 index field of the section, so that we can find it again when
12284 outputting relocs. */
12286 elfsym
.st_size
= 0;
12287 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12288 elfsym
.st_other
= 0;
12289 elfsym
.st_value
= 0;
12290 elfsym
.st_target_internal
= 0;
12291 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12293 o
= bfd_section_from_elf_index (abfd
, i
);
12296 o
->target_index
= bfd_get_symcount (abfd
);
12297 elfsym
.st_shndx
= i
;
12298 if (!bfd_link_relocatable (info
))
12299 elfsym
.st_value
= o
->vma
;
12300 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
, o
,
12307 /* Allocate some memory to hold information read in from the input
12309 if (max_contents_size
!= 0)
12311 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12312 if (flinfo
.contents
== NULL
)
12316 if (max_external_reloc_size
!= 0)
12318 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12319 if (flinfo
.external_relocs
== NULL
)
12323 if (max_internal_reloc_count
!= 0)
12325 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12326 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12327 if (flinfo
.internal_relocs
== NULL
)
12331 if (max_sym_count
!= 0)
12333 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12334 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12335 if (flinfo
.external_syms
== NULL
)
12338 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12339 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12340 if (flinfo
.internal_syms
== NULL
)
12343 amt
= max_sym_count
* sizeof (long);
12344 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12345 if (flinfo
.indices
== NULL
)
12348 amt
= max_sym_count
* sizeof (asection
*);
12349 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12350 if (flinfo
.sections
== NULL
)
12354 if (max_sym_shndx_count
!= 0)
12356 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12357 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12358 if (flinfo
.locsym_shndx
== NULL
)
12364 bfd_vma base
, end
= 0; /* Both bytes. */
12367 for (sec
= htab
->tls_sec
;
12368 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12371 bfd_size_type size
= sec
->size
;
12372 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12375 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12377 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12380 size
= ord
->offset
* opb
+ ord
->size
;
12382 end
= sec
->vma
+ size
/ opb
;
12384 base
= htab
->tls_sec
->vma
;
12385 /* Only align end of TLS section if static TLS doesn't have special
12386 alignment requirements. */
12387 if (bed
->static_tls_alignment
== 1)
12388 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12389 htab
->tls_size
= end
- base
;
12392 /* Reorder SHF_LINK_ORDER sections. */
12393 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12395 if (!elf_fixup_link_order (abfd
, o
))
12399 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12402 /* Since ELF permits relocations to be against local symbols, we
12403 must have the local symbols available when we do the relocations.
12404 Since we would rather only read the local symbols once, and we
12405 would rather not keep them in memory, we handle all the
12406 relocations for a single input file at the same time.
12408 Unfortunately, there is no way to know the total number of local
12409 symbols until we have seen all of them, and the local symbol
12410 indices precede the global symbol indices. This means that when
12411 we are generating relocatable output, and we see a reloc against
12412 a global symbol, we can not know the symbol index until we have
12413 finished examining all the local symbols to see which ones we are
12414 going to output. To deal with this, we keep the relocations in
12415 memory, and don't output them until the end of the link. This is
12416 an unfortunate waste of memory, but I don't see a good way around
12417 it. Fortunately, it only happens when performing a relocatable
12418 link, which is not the common case. FIXME: If keep_memory is set
12419 we could write the relocs out and then read them again; I don't
12420 know how bad the memory loss will be. */
12422 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12423 sub
->output_has_begun
= FALSE
;
12424 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12426 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12428 if (p
->type
== bfd_indirect_link_order
12429 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12430 == bfd_target_elf_flavour
)
12431 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12433 if (! sub
->output_has_begun
)
12435 if (! elf_link_input_bfd (&flinfo
, sub
))
12437 sub
->output_has_begun
= TRUE
;
12440 else if (p
->type
== bfd_section_reloc_link_order
12441 || p
->type
== bfd_symbol_reloc_link_order
)
12443 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12448 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12450 if (p
->type
== bfd_indirect_link_order
12451 && (bfd_get_flavour (sub
)
12452 == bfd_target_elf_flavour
)
12453 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12454 != bed
->s
->elfclass
))
12456 const char *iclass
, *oclass
;
12458 switch (bed
->s
->elfclass
)
12460 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12461 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12462 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12466 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12468 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12469 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12470 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12474 bfd_set_error (bfd_error_wrong_format
);
12476 /* xgettext:c-format */
12477 (_("%pB: file class %s incompatible with %s"),
12478 sub
, iclass
, oclass
);
12487 /* Free symbol buffer if needed. */
12488 if (!info
->reduce_memory_overheads
)
12490 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12491 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
12492 && elf_tdata (sub
)->symbuf
)
12494 free (elf_tdata (sub
)->symbuf
);
12495 elf_tdata (sub
)->symbuf
= NULL
;
12499 /* Output any global symbols that got converted to local in a
12500 version script or due to symbol visibility. We do this in a
12501 separate step since ELF requires all local symbols to appear
12502 prior to any global symbols. FIXME: We should only do this if
12503 some global symbols were, in fact, converted to become local.
12504 FIXME: Will this work correctly with the Irix 5 linker? */
12505 eoinfo
.failed
= FALSE
;
12506 eoinfo
.flinfo
= &flinfo
;
12507 eoinfo
.localsyms
= TRUE
;
12508 eoinfo
.file_sym_done
= FALSE
;
12509 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12513 /* If backend needs to output some local symbols not present in the hash
12514 table, do it now. */
12515 if (bed
->elf_backend_output_arch_local_syms
12516 && (info
->strip
!= strip_all
|| emit_relocs
))
12518 typedef int (*out_sym_func
)
12519 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12520 struct elf_link_hash_entry
*);
12522 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12523 (abfd
, info
, &flinfo
,
12524 (out_sym_func
) elf_link_output_symstrtab
)))
12528 /* That wrote out all the local symbols. Finish up the symbol table
12529 with the global symbols. Even if we want to strip everything we
12530 can, we still need to deal with those global symbols that got
12531 converted to local in a version script. */
12533 /* The sh_info field records the index of the first non local symbol. */
12534 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12537 && htab
->dynsym
!= NULL
12538 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12540 Elf_Internal_Sym sym
;
12541 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12543 o
= htab
->dynsym
->output_section
;
12544 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12546 /* Write out the section symbols for the output sections. */
12547 if (bfd_link_pic (info
)
12548 || htab
->is_relocatable_executable
)
12554 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12556 sym
.st_target_internal
= 0;
12558 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12564 dynindx
= elf_section_data (s
)->dynindx
;
12567 indx
= elf_section_data (s
)->this_idx
;
12568 BFD_ASSERT (indx
> 0);
12569 sym
.st_shndx
= indx
;
12570 if (! check_dynsym (abfd
, &sym
))
12572 sym
.st_value
= s
->vma
;
12573 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12574 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12578 /* Write out the local dynsyms. */
12579 if (htab
->dynlocal
)
12581 struct elf_link_local_dynamic_entry
*e
;
12582 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12587 /* Copy the internal symbol and turn off visibility.
12588 Note that we saved a word of storage and overwrote
12589 the original st_name with the dynstr_index. */
12591 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12593 s
= bfd_section_from_elf_index (e
->input_bfd
,
12598 elf_section_data (s
->output_section
)->this_idx
;
12599 if (! check_dynsym (abfd
, &sym
))
12601 sym
.st_value
= (s
->output_section
->vma
12603 + e
->isym
.st_value
);
12606 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12607 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12612 /* We get the global symbols from the hash table. */
12613 eoinfo
.failed
= FALSE
;
12614 eoinfo
.localsyms
= FALSE
;
12615 eoinfo
.flinfo
= &flinfo
;
12616 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12620 /* If backend needs to output some symbols not present in the hash
12621 table, do it now. */
12622 if (bed
->elf_backend_output_arch_syms
12623 && (info
->strip
!= strip_all
|| emit_relocs
))
12625 typedef int (*out_sym_func
)
12626 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12627 struct elf_link_hash_entry
*);
12629 if (! ((*bed
->elf_backend_output_arch_syms
)
12630 (abfd
, info
, &flinfo
,
12631 (out_sym_func
) elf_link_output_symstrtab
)))
12635 /* Finalize the .strtab section. */
12636 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12638 /* Swap out the .strtab section. */
12639 if (!elf_link_swap_symbols_out (&flinfo
))
12642 /* Now we know the size of the symtab section. */
12643 if (bfd_get_symcount (abfd
) > 0)
12645 /* Finish up and write out the symbol string table (.strtab)
12647 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12648 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12650 if (elf_symtab_shndx_list (abfd
))
12652 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12654 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12656 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12657 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12658 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12659 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12660 symtab_shndx_hdr
->sh_size
= amt
;
12662 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12665 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12666 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12671 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12672 /* sh_name was set in prep_headers. */
12673 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12674 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12675 symstrtab_hdr
->sh_addr
= 0;
12676 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12677 symstrtab_hdr
->sh_entsize
= 0;
12678 symstrtab_hdr
->sh_link
= 0;
12679 symstrtab_hdr
->sh_info
= 0;
12680 /* sh_offset is set just below. */
12681 symstrtab_hdr
->sh_addralign
= 1;
12683 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12685 elf_next_file_pos (abfd
) = off
;
12687 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12688 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12692 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12694 _bfd_error_handler (_("%pB: failed to generate import library"),
12695 info
->out_implib_bfd
);
12699 /* Adjust the relocs to have the correct symbol indices. */
12700 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12702 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12705 if ((o
->flags
& SEC_RELOC
) == 0)
12708 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12709 if (esdo
->rel
.hdr
!= NULL
12710 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12712 if (esdo
->rela
.hdr
!= NULL
12713 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12716 /* Set the reloc_count field to 0 to prevent write_relocs from
12717 trying to swap the relocs out itself. */
12718 o
->reloc_count
= 0;
12721 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12722 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12724 /* If we are linking against a dynamic object, or generating a
12725 shared library, finish up the dynamic linking information. */
12728 bfd_byte
*dyncon
, *dynconend
;
12730 /* Fix up .dynamic entries. */
12731 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12732 BFD_ASSERT (o
!= NULL
);
12734 dyncon
= o
->contents
;
12735 dynconend
= o
->contents
+ o
->size
;
12736 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12738 Elf_Internal_Dyn dyn
;
12741 bfd_size_type sh_size
;
12744 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12751 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12753 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12755 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12756 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12759 dyn
.d_un
.d_val
= relativecount
;
12766 name
= info
->init_function
;
12769 name
= info
->fini_function
;
12772 struct elf_link_hash_entry
*h
;
12774 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
12776 && (h
->root
.type
== bfd_link_hash_defined
12777 || h
->root
.type
== bfd_link_hash_defweak
))
12779 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12780 o
= h
->root
.u
.def
.section
;
12781 if (o
->output_section
!= NULL
)
12782 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12783 + o
->output_offset
);
12786 /* The symbol is imported from another shared
12787 library and does not apply to this one. */
12788 dyn
.d_un
.d_ptr
= 0;
12795 case DT_PREINIT_ARRAYSZ
:
12796 name
= ".preinit_array";
12798 case DT_INIT_ARRAYSZ
:
12799 name
= ".init_array";
12801 case DT_FINI_ARRAYSZ
:
12802 name
= ".fini_array";
12804 o
= bfd_get_section_by_name (abfd
, name
);
12808 (_("could not find section %s"), name
);
12813 (_("warning: %s section has zero size"), name
);
12814 dyn
.d_un
.d_val
= o
->size
;
12817 case DT_PREINIT_ARRAY
:
12818 name
= ".preinit_array";
12820 case DT_INIT_ARRAY
:
12821 name
= ".init_array";
12823 case DT_FINI_ARRAY
:
12824 name
= ".fini_array";
12826 o
= bfd_get_section_by_name (abfd
, name
);
12833 name
= ".gnu.hash";
12842 name
= ".gnu.version_d";
12845 name
= ".gnu.version_r";
12848 name
= ".gnu.version";
12850 o
= bfd_get_linker_section (dynobj
, name
);
12852 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
12855 (_("could not find section %s"), name
);
12858 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
12861 (_("warning: section '%s' is being made into a note"), name
);
12862 bfd_set_error (bfd_error_nonrepresentable_section
);
12865 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
12872 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
12878 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12880 Elf_Internal_Shdr
*hdr
;
12882 hdr
= elf_elfsections (abfd
)[i
];
12883 if (hdr
->sh_type
== type
12884 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
12886 sh_size
+= hdr
->sh_size
;
12888 || sh_addr
> hdr
->sh_addr
)
12889 sh_addr
= hdr
->sh_addr
;
12893 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
12895 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
12897 /* Don't count procedure linkage table relocs in the
12898 overall reloc count. */
12899 sh_size
-= htab
->srelplt
->size
;
12901 /* If the size is zero, make the address zero too.
12902 This is to avoid a glibc bug. If the backend
12903 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
12904 zero, then we'll put DT_RELA at the end of
12905 DT_JMPREL. glibc will interpret the end of
12906 DT_RELA matching the end of DT_JMPREL as the
12907 case where DT_RELA includes DT_JMPREL, and for
12908 LD_BIND_NOW will decide that processing DT_RELA
12909 will process the PLT relocs too. Net result:
12910 No PLT relocs applied. */
12913 /* If .rela.plt is the first .rela section, exclude
12914 it from DT_RELA. */
12915 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
12916 + htab
->srelplt
->output_offset
) * opb
)
12917 sh_addr
+= htab
->srelplt
->size
;
12920 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
12921 dyn
.d_un
.d_val
= sh_size
;
12923 dyn
.d_un
.d_ptr
= sh_addr
;
12926 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
12930 /* If we have created any dynamic sections, then output them. */
12931 if (dynobj
!= NULL
)
12933 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
12936 /* Check for DT_TEXTREL (late, in case the backend removes it). */
12937 if (((info
->warn_shared_textrel
&& bfd_link_pic (info
))
12938 || info
->error_textrel
)
12939 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
12941 bfd_byte
*dyncon
, *dynconend
;
12943 dyncon
= o
->contents
;
12944 dynconend
= o
->contents
+ o
->size
;
12945 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12947 Elf_Internal_Dyn dyn
;
12949 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12951 if (dyn
.d_tag
== DT_TEXTREL
)
12953 if (info
->error_textrel
)
12954 info
->callbacks
->einfo
12955 (_("%P%X: read-only segment has dynamic relocations\n"));
12957 info
->callbacks
->einfo
12958 (_("%P: warning: creating a DT_TEXTREL in a shared object\n"));
12964 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
12966 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
12968 || o
->output_section
== bfd_abs_section_ptr
)
12970 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
12972 /* At this point, we are only interested in sections
12973 created by _bfd_elf_link_create_dynamic_sections. */
12976 if (htab
->stab_info
.stabstr
== o
)
12978 if (htab
->eh_info
.hdr_sec
== o
)
12980 if (strcmp (o
->name
, ".dynstr") != 0)
12982 bfd_size_type octets
= ((file_ptr
) o
->output_offset
12983 * bfd_octets_per_byte (abfd
, o
));
12984 if (!bfd_set_section_contents (abfd
, o
->output_section
,
12985 o
->contents
, octets
, o
->size
))
12990 /* The contents of the .dynstr section are actually in a
12994 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
12995 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
12996 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13002 if (!info
->resolve_section_groups
)
13004 bfd_boolean failed
= FALSE
;
13006 BFD_ASSERT (bfd_link_relocatable (info
));
13007 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13012 /* If we have optimized stabs strings, output them. */
13013 if (htab
->stab_info
.stabstr
!= NULL
)
13015 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13019 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13022 if (info
->callbacks
->emit_ctf
)
13023 info
->callbacks
->emit_ctf ();
13025 elf_final_link_free (abfd
, &flinfo
);
13029 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13030 if (contents
== NULL
)
13031 return FALSE
; /* Bail out and fail. */
13032 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13033 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13040 elf_final_link_free (abfd
, &flinfo
);
13044 /* Initialize COOKIE for input bfd ABFD. */
13047 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13048 struct bfd_link_info
*info
, bfd
*abfd
)
13050 Elf_Internal_Shdr
*symtab_hdr
;
13051 const struct elf_backend_data
*bed
;
13053 bed
= get_elf_backend_data (abfd
);
13054 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13056 cookie
->abfd
= abfd
;
13057 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13058 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13059 if (cookie
->bad_symtab
)
13061 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13062 cookie
->extsymoff
= 0;
13066 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13067 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13070 if (bed
->s
->arch_size
== 32)
13071 cookie
->r_sym_shift
= 8;
13073 cookie
->r_sym_shift
= 32;
13075 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13076 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13078 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13079 cookie
->locsymcount
, 0,
13081 if (cookie
->locsyms
== NULL
)
13083 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13086 if (info
->keep_memory
)
13087 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13092 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13095 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13097 Elf_Internal_Shdr
*symtab_hdr
;
13099 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13100 if (cookie
->locsyms
!= NULL
13101 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13102 free (cookie
->locsyms
);
13105 /* Initialize the relocation information in COOKIE for input section SEC
13106 of input bfd ABFD. */
13109 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13110 struct bfd_link_info
*info
, bfd
*abfd
,
13113 if (sec
->reloc_count
== 0)
13115 cookie
->rels
= NULL
;
13116 cookie
->relend
= NULL
;
13120 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13121 info
->keep_memory
);
13122 if (cookie
->rels
== NULL
)
13124 cookie
->rel
= cookie
->rels
;
13125 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13127 cookie
->rel
= cookie
->rels
;
13131 /* Free the memory allocated by init_reloc_cookie_rels,
13135 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13138 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
13139 free (cookie
->rels
);
13142 /* Initialize the whole of COOKIE for input section SEC. */
13145 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13146 struct bfd_link_info
*info
,
13149 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13151 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13156 fini_reloc_cookie (cookie
, sec
->owner
);
13161 /* Free the memory allocated by init_reloc_cookie_for_section,
13165 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13168 fini_reloc_cookie_rels (cookie
, sec
);
13169 fini_reloc_cookie (cookie
, sec
->owner
);
13172 /* Garbage collect unused sections. */
13174 /* Default gc_mark_hook. */
13177 _bfd_elf_gc_mark_hook (asection
*sec
,
13178 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13179 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13180 struct elf_link_hash_entry
*h
,
13181 Elf_Internal_Sym
*sym
)
13185 switch (h
->root
.type
)
13187 case bfd_link_hash_defined
:
13188 case bfd_link_hash_defweak
:
13189 return h
->root
.u
.def
.section
;
13191 case bfd_link_hash_common
:
13192 return h
->root
.u
.c
.p
->section
;
13199 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13204 /* Return the debug definition section. */
13207 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13208 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13209 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13210 struct elf_link_hash_entry
*h
,
13211 Elf_Internal_Sym
*sym
)
13215 /* Return the global debug definition section. */
13216 if ((h
->root
.type
== bfd_link_hash_defined
13217 || h
->root
.type
== bfd_link_hash_defweak
)
13218 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13219 return h
->root
.u
.def
.section
;
13223 /* Return the local debug definition section. */
13224 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13226 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13233 /* COOKIE->rel describes a relocation against section SEC, which is
13234 a section we've decided to keep. Return the section that contains
13235 the relocation symbol, or NULL if no section contains it. */
13238 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13239 elf_gc_mark_hook_fn gc_mark_hook
,
13240 struct elf_reloc_cookie
*cookie
,
13241 bfd_boolean
*start_stop
)
13243 unsigned long r_symndx
;
13244 struct elf_link_hash_entry
*h
, *hw
;
13246 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13247 if (r_symndx
== STN_UNDEF
)
13250 if (r_symndx
>= cookie
->locsymcount
13251 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13253 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13256 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13260 while (h
->root
.type
== bfd_link_hash_indirect
13261 || h
->root
.type
== bfd_link_hash_warning
)
13262 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13264 /* Keep all aliases of the symbol too. If an object symbol
13265 needs to be copied into .dynbss then all of its aliases
13266 should be present as dynamic symbols, not just the one used
13267 on the copy relocation. */
13269 while (hw
->is_weakalias
)
13275 if (start_stop
!= NULL
)
13277 /* To work around a glibc bug, mark XXX input sections
13278 when there is a reference to __start_XXX or __stop_XXX
13282 asection
*s
= h
->u2
.start_stop_section
;
13283 *start_stop
= !s
->gc_mark
;
13288 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13291 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13292 &cookie
->locsyms
[r_symndx
]);
13295 /* COOKIE->rel describes a relocation against section SEC, which is
13296 a section we've decided to keep. Mark the section that contains
13297 the relocation symbol. */
13300 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13302 elf_gc_mark_hook_fn gc_mark_hook
,
13303 struct elf_reloc_cookie
*cookie
)
13306 bfd_boolean start_stop
= FALSE
;
13308 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13309 while (rsec
!= NULL
)
13311 if (!rsec
->gc_mark
)
13313 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13314 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13316 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13321 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13326 /* The mark phase of garbage collection. For a given section, mark
13327 it and any sections in this section's group, and all the sections
13328 which define symbols to which it refers. */
13331 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13333 elf_gc_mark_hook_fn gc_mark_hook
)
13336 asection
*group_sec
, *eh_frame
;
13340 /* Mark all the sections in the group. */
13341 group_sec
= elf_section_data (sec
)->next_in_group
;
13342 if (group_sec
&& !group_sec
->gc_mark
)
13343 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13346 /* Look through the section relocs. */
13348 eh_frame
= elf_eh_frame_section (sec
->owner
);
13349 if ((sec
->flags
& SEC_RELOC
) != 0
13350 && sec
->reloc_count
> 0
13351 && sec
!= eh_frame
)
13353 struct elf_reloc_cookie cookie
;
13355 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13359 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13360 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13365 fini_reloc_cookie_for_section (&cookie
, sec
);
13369 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13371 struct elf_reloc_cookie cookie
;
13373 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13377 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13378 gc_mark_hook
, &cookie
))
13380 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13384 eh_frame
= elf_section_eh_frame_entry (sec
);
13385 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13386 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13392 /* Scan and mark sections in a special or debug section group. */
13395 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13397 /* Point to first section of section group. */
13399 /* Used to iterate the section group. */
13402 bfd_boolean is_special_grp
= TRUE
;
13403 bfd_boolean is_debug_grp
= TRUE
;
13405 /* First scan to see if group contains any section other than debug
13406 and special section. */
13407 ssec
= msec
= elf_next_in_group (grp
);
13410 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13411 is_debug_grp
= FALSE
;
13413 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13414 is_special_grp
= FALSE
;
13416 msec
= elf_next_in_group (msec
);
13418 while (msec
!= ssec
);
13420 /* If this is a pure debug section group or pure special section group,
13421 keep all sections in this group. */
13422 if (is_debug_grp
|| is_special_grp
)
13427 msec
= elf_next_in_group (msec
);
13429 while (msec
!= ssec
);
13433 /* Keep debug and special sections. */
13436 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13437 elf_gc_mark_hook_fn mark_hook
)
13441 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13444 bfd_boolean some_kept
;
13445 bfd_boolean debug_frag_seen
;
13446 bfd_boolean has_kept_debug_info
;
13448 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13450 isec
= ibfd
->sections
;
13451 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13454 /* Ensure all linker created sections are kept,
13455 see if any other section is already marked,
13456 and note if we have any fragmented debug sections. */
13457 debug_frag_seen
= some_kept
= has_kept_debug_info
= FALSE
;
13458 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13460 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13462 else if (isec
->gc_mark
13463 && (isec
->flags
& SEC_ALLOC
) != 0
13464 && elf_section_type (isec
) != SHT_NOTE
)
13468 /* Since all sections, except for backend specific ones,
13469 have been garbage collected, call mark_hook on this
13470 section if any of its linked-to sections is marked. */
13471 asection
*linked_to_sec
= elf_linked_to_section (isec
);
13472 for (; linked_to_sec
!= NULL
;
13473 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13474 if (linked_to_sec
->gc_mark
)
13476 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13482 if (!debug_frag_seen
13483 && (isec
->flags
& SEC_DEBUGGING
)
13484 && CONST_STRNEQ (isec
->name
, ".debug_line."))
13485 debug_frag_seen
= TRUE
;
13486 else if (strcmp (bfd_section_name (isec
),
13487 "__patchable_function_entries") == 0
13488 && elf_linked_to_section (isec
) == NULL
)
13489 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13490 "need linked-to section "
13491 "for --gc-sections\n"),
13492 isec
->owner
, isec
);
13495 /* If no non-note alloc section in this file will be kept, then
13496 we can toss out the debug and special sections. */
13500 /* Keep debug and special sections like .comment when they are
13501 not part of a group. Also keep section groups that contain
13502 just debug sections or special sections. NB: Sections with
13503 linked-to section has been handled above. */
13504 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13506 if ((isec
->flags
& SEC_GROUP
) != 0)
13507 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13508 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13509 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13510 && elf_next_in_group (isec
) == NULL
13511 && elf_linked_to_section (isec
) == NULL
)
13513 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13514 has_kept_debug_info
= TRUE
;
13517 /* Look for CODE sections which are going to be discarded,
13518 and find and discard any fragmented debug sections which
13519 are associated with that code section. */
13520 if (debug_frag_seen
)
13521 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13522 if ((isec
->flags
& SEC_CODE
) != 0
13523 && isec
->gc_mark
== 0)
13528 ilen
= strlen (isec
->name
);
13530 /* Association is determined by the name of the debug
13531 section containing the name of the code section as
13532 a suffix. For example .debug_line.text.foo is a
13533 debug section associated with .text.foo. */
13534 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13538 if (dsec
->gc_mark
== 0
13539 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13542 dlen
= strlen (dsec
->name
);
13545 && strncmp (dsec
->name
+ (dlen
- ilen
),
13546 isec
->name
, ilen
) == 0)
13551 /* Mark debug sections referenced by kept debug sections. */
13552 if (has_kept_debug_info
)
13553 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13555 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13556 if (!_bfd_elf_gc_mark (info
, isec
,
13557 elf_gc_mark_debug_section
))
13564 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13567 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13569 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13573 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13574 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13575 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13578 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13581 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13583 /* When any section in a section group is kept, we keep all
13584 sections in the section group. If the first member of
13585 the section group is excluded, we will also exclude the
13587 if (o
->flags
& SEC_GROUP
)
13589 asection
*first
= elf_next_in_group (o
);
13590 o
->gc_mark
= first
->gc_mark
;
13596 /* Skip sweeping sections already excluded. */
13597 if (o
->flags
& SEC_EXCLUDE
)
13600 /* Since this is early in the link process, it is simple
13601 to remove a section from the output. */
13602 o
->flags
|= SEC_EXCLUDE
;
13604 if (info
->print_gc_sections
&& o
->size
!= 0)
13605 /* xgettext:c-format */
13606 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13614 /* Propagate collected vtable information. This is called through
13615 elf_link_hash_traverse. */
13618 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13620 /* Those that are not vtables. */
13622 || h
->u2
.vtable
== NULL
13623 || h
->u2
.vtable
->parent
== NULL
)
13626 /* Those vtables that do not have parents, we cannot merge. */
13627 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13630 /* If we've already been done, exit. */
13631 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13634 /* Make sure the parent's table is up to date. */
13635 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13637 if (h
->u2
.vtable
->used
== NULL
)
13639 /* None of this table's entries were referenced. Re-use the
13641 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13642 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13647 bfd_boolean
*cu
, *pu
;
13649 /* Or the parent's entries into ours. */
13650 cu
= h
->u2
.vtable
->used
;
13652 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13655 const struct elf_backend_data
*bed
;
13656 unsigned int log_file_align
;
13658 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13659 log_file_align
= bed
->s
->log_file_align
;
13660 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13675 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13678 bfd_vma hstart
, hend
;
13679 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13680 const struct elf_backend_data
*bed
;
13681 unsigned int log_file_align
;
13683 /* Take care of both those symbols that do not describe vtables as
13684 well as those that are not loaded. */
13686 || h
->u2
.vtable
== NULL
13687 || h
->u2
.vtable
->parent
== NULL
)
13690 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13691 || h
->root
.type
== bfd_link_hash_defweak
);
13693 sec
= h
->root
.u
.def
.section
;
13694 hstart
= h
->root
.u
.def
.value
;
13695 hend
= hstart
+ h
->size
;
13697 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
13699 return *(bfd_boolean
*) okp
= FALSE
;
13700 bed
= get_elf_backend_data (sec
->owner
);
13701 log_file_align
= bed
->s
->log_file_align
;
13703 relend
= relstart
+ sec
->reloc_count
;
13705 for (rel
= relstart
; rel
< relend
; ++rel
)
13706 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13708 /* If the entry is in use, do nothing. */
13709 if (h
->u2
.vtable
->used
13710 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13712 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13713 if (h
->u2
.vtable
->used
[entry
])
13716 /* Otherwise, kill it. */
13717 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13723 /* Mark sections containing dynamically referenced symbols. When
13724 building shared libraries, we must assume that any visible symbol is
13728 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13730 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13731 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13733 if ((h
->root
.type
== bfd_link_hash_defined
13734 || h
->root
.type
== bfd_link_hash_defweak
)
13735 && ((h
->ref_dynamic
&& !h
->forced_local
)
13736 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13737 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13738 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13739 && (!bfd_link_executable (info
)
13740 || info
->gc_keep_exported
13741 || info
->export_dynamic
13744 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13745 && (h
->versioned
>= versioned
13746 || !bfd_hide_sym_by_version (info
->version_info
,
13747 h
->root
.root
.string
)))))
13748 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13753 /* Keep all sections containing symbols undefined on the command-line,
13754 and the section containing the entry symbol. */
13757 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13759 struct bfd_sym_chain
*sym
;
13761 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13763 struct elf_link_hash_entry
*h
;
13765 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13766 FALSE
, FALSE
, FALSE
);
13769 && (h
->root
.type
== bfd_link_hash_defined
13770 || h
->root
.type
== bfd_link_hash_defweak
)
13771 && !bfd_is_abs_section (h
->root
.u
.def
.section
)
13772 && !bfd_is_und_section (h
->root
.u
.def
.section
))
13773 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13778 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13779 struct bfd_link_info
*info
)
13781 bfd
*ibfd
= info
->input_bfds
;
13783 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13786 struct elf_reloc_cookie cookie
;
13788 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13790 sec
= ibfd
->sections
;
13791 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13794 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
13797 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
13799 if (CONST_STRNEQ (bfd_section_name (sec
), ".eh_frame_entry")
13800 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
13802 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
13803 fini_reloc_cookie_rels (&cookie
, sec
);
13810 /* Do mark and sweep of unused sections. */
13813 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
13815 bfd_boolean ok
= TRUE
;
13817 elf_gc_mark_hook_fn gc_mark_hook
;
13818 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13819 struct elf_link_hash_table
*htab
;
13821 if (!bed
->can_gc_sections
13822 || !is_elf_hash_table (info
->hash
))
13824 _bfd_error_handler(_("warning: gc-sections option ignored"));
13828 bed
->gc_keep (info
);
13829 htab
= elf_hash_table (info
);
13831 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
13832 at the .eh_frame section if we can mark the FDEs individually. */
13833 for (sub
= info
->input_bfds
;
13834 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
13835 sub
= sub
->link
.next
)
13838 struct elf_reloc_cookie cookie
;
13840 sec
= sub
->sections
;
13841 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13843 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
13844 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
13846 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
13847 if (elf_section_data (sec
)->sec_info
13848 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
13849 elf_eh_frame_section (sub
) = sec
;
13850 fini_reloc_cookie_for_section (&cookie
, sec
);
13851 sec
= bfd_get_next_section_by_name (NULL
, sec
);
13855 /* Apply transitive closure to the vtable entry usage info. */
13856 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
13860 /* Kill the vtable relocations that were not used. */
13861 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
13865 /* Mark dynamically referenced symbols. */
13866 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
13867 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
13869 /* Grovel through relocs to find out who stays ... */
13870 gc_mark_hook
= bed
->gc_mark_hook
;
13871 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13875 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13876 || elf_object_id (sub
) != elf_hash_table_id (htab
)
13877 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13881 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13884 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
13885 Also treat note sections as a root, if the section is not part
13886 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
13887 well as FINI_ARRAY sections for ld -r. */
13888 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13890 && (o
->flags
& SEC_EXCLUDE
) == 0
13891 && ((o
->flags
& SEC_KEEP
) != 0
13892 || (bfd_link_relocatable (info
)
13893 && ((elf_section_data (o
)->this_hdr
.sh_type
13894 == SHT_PREINIT_ARRAY
)
13895 || (elf_section_data (o
)->this_hdr
.sh_type
13897 || (elf_section_data (o
)->this_hdr
.sh_type
13898 == SHT_FINI_ARRAY
)))
13899 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
13900 && elf_next_in_group (o
) == NULL
)))
13902 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
13907 /* Allow the backend to mark additional target specific sections. */
13908 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
13910 /* ... and mark SEC_EXCLUDE for those that go. */
13911 return elf_gc_sweep (abfd
, info
);
13914 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
13917 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
13919 struct elf_link_hash_entry
*h
,
13922 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
13923 struct elf_link_hash_entry
**search
, *child
;
13924 size_t extsymcount
;
13925 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13927 /* The sh_info field of the symtab header tells us where the
13928 external symbols start. We don't care about the local symbols at
13930 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
13931 if (!elf_bad_symtab (abfd
))
13932 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
13934 sym_hashes
= elf_sym_hashes (abfd
);
13935 sym_hashes_end
= sym_hashes
+ extsymcount
;
13937 /* Hunt down the child symbol, which is in this section at the same
13938 offset as the relocation. */
13939 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
13941 if ((child
= *search
) != NULL
13942 && (child
->root
.type
== bfd_link_hash_defined
13943 || child
->root
.type
== bfd_link_hash_defweak
)
13944 && child
->root
.u
.def
.section
== sec
13945 && child
->root
.u
.def
.value
== offset
)
13949 /* xgettext:c-format */
13950 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
13951 abfd
, sec
, (uint64_t) offset
);
13952 bfd_set_error (bfd_error_invalid_operation
);
13956 if (!child
->u2
.vtable
)
13958 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
13959 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
13960 if (!child
->u2
.vtable
)
13965 /* This *should* only be the absolute section. It could potentially
13966 be that someone has defined a non-global vtable though, which
13967 would be bad. It isn't worth paging in the local symbols to be
13968 sure though; that case should simply be handled by the assembler. */
13970 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
13973 child
->u2
.vtable
->parent
= h
;
13978 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13981 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
13982 struct elf_link_hash_entry
*h
,
13985 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13986 unsigned int log_file_align
= bed
->s
->log_file_align
;
13990 /* xgettext:c-format */
13991 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
13993 bfd_set_error (bfd_error_bad_value
);
13999 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14000 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14005 if (addend
>= h
->u2
.vtable
->size
)
14007 size_t size
, bytes
, file_align
;
14008 bfd_boolean
*ptr
= h
->u2
.vtable
->used
;
14010 /* While the symbol is undefined, we have to be prepared to handle
14012 file_align
= 1 << log_file_align
;
14013 if (h
->root
.type
== bfd_link_hash_undefined
)
14014 size
= addend
+ file_align
;
14018 if (addend
>= size
)
14020 /* Oops! We've got a reference past the defined end of
14021 the table. This is probably a bug -- shall we warn? */
14022 size
= addend
+ file_align
;
14025 size
= (size
+ file_align
- 1) & -file_align
;
14027 /* Allocate one extra entry for use as a "done" flag for the
14028 consolidation pass. */
14029 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
14033 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
14039 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14040 * sizeof (bfd_boolean
));
14041 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14045 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
14050 /* And arrange for that done flag to be at index -1. */
14051 h
->u2
.vtable
->used
= ptr
+ 1;
14052 h
->u2
.vtable
->size
= size
;
14055 h
->u2
.vtable
->used
[addend
>> log_file_align
] = TRUE
;
14060 /* Map an ELF section header flag to its corresponding string. */
14064 flagword flag_value
;
14065 } elf_flags_to_name_table
;
14067 static elf_flags_to_name_table elf_flags_to_names
[] =
14069 { "SHF_WRITE", SHF_WRITE
},
14070 { "SHF_ALLOC", SHF_ALLOC
},
14071 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14072 { "SHF_MERGE", SHF_MERGE
},
14073 { "SHF_STRINGS", SHF_STRINGS
},
14074 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14075 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14076 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14077 { "SHF_GROUP", SHF_GROUP
},
14078 { "SHF_TLS", SHF_TLS
},
14079 { "SHF_MASKOS", SHF_MASKOS
},
14080 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14083 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14085 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14086 struct flag_info
*flaginfo
,
14089 const bfd_vma sh_flags
= elf_section_flags (section
);
14091 if (!flaginfo
->flags_initialized
)
14093 bfd
*obfd
= info
->output_bfd
;
14094 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14095 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14097 int without_hex
= 0;
14099 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14102 flagword (*lookup
) (char *);
14104 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14105 if (lookup
!= NULL
)
14107 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14111 if (tf
->with
== with_flags
)
14112 with_hex
|= hexval
;
14113 else if (tf
->with
== without_flags
)
14114 without_hex
|= hexval
;
14119 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14121 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14123 if (tf
->with
== with_flags
)
14124 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14125 else if (tf
->with
== without_flags
)
14126 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14133 info
->callbacks
->einfo
14134 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14138 flaginfo
->flags_initialized
= TRUE
;
14139 flaginfo
->only_with_flags
|= with_hex
;
14140 flaginfo
->not_with_flags
|= without_hex
;
14143 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14146 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14152 struct alloc_got_off_arg
{
14154 struct bfd_link_info
*info
;
14157 /* We need a special top-level link routine to convert got reference counts
14158 to real got offsets. */
14161 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14163 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14164 bfd
*obfd
= gofarg
->info
->output_bfd
;
14165 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14167 if (h
->got
.refcount
> 0)
14169 h
->got
.offset
= gofarg
->gotoff
;
14170 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14173 h
->got
.offset
= (bfd_vma
) -1;
14178 /* And an accompanying bit to work out final got entry offsets once
14179 we're done. Should be called from final_link. */
14182 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14183 struct bfd_link_info
*info
)
14186 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14188 struct alloc_got_off_arg gofarg
;
14190 BFD_ASSERT (abfd
== info
->output_bfd
);
14192 if (! is_elf_hash_table (info
->hash
))
14195 /* The GOT offset is relative to the .got section, but the GOT header is
14196 put into the .got.plt section, if the backend uses it. */
14197 if (bed
->want_got_plt
)
14200 gotoff
= bed
->got_header_size
;
14202 /* Do the local .got entries first. */
14203 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14205 bfd_signed_vma
*local_got
;
14206 size_t j
, locsymcount
;
14207 Elf_Internal_Shdr
*symtab_hdr
;
14209 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14212 local_got
= elf_local_got_refcounts (i
);
14216 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14217 if (elf_bad_symtab (i
))
14218 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14220 locsymcount
= symtab_hdr
->sh_info
;
14222 for (j
= 0; j
< locsymcount
; ++j
)
14224 if (local_got
[j
] > 0)
14226 local_got
[j
] = gotoff
;
14227 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14230 local_got
[j
] = (bfd_vma
) -1;
14234 /* Then the global .got entries. .plt refcounts are handled by
14235 adjust_dynamic_symbol */
14236 gofarg
.gotoff
= gotoff
;
14237 gofarg
.info
= info
;
14238 elf_link_hash_traverse (elf_hash_table (info
),
14239 elf_gc_allocate_got_offsets
,
14244 /* Many folk need no more in the way of final link than this, once
14245 got entry reference counting is enabled. */
14248 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14250 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14253 /* Invoke the regular ELF backend linker to do all the work. */
14254 return bfd_elf_final_link (abfd
, info
);
14258 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14260 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14262 if (rcookie
->bad_symtab
)
14263 rcookie
->rel
= rcookie
->rels
;
14265 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14267 unsigned long r_symndx
;
14269 if (! rcookie
->bad_symtab
)
14270 if (rcookie
->rel
->r_offset
> offset
)
14272 if (rcookie
->rel
->r_offset
!= offset
)
14275 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14276 if (r_symndx
== STN_UNDEF
)
14279 if (r_symndx
>= rcookie
->locsymcount
14280 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14282 struct elf_link_hash_entry
*h
;
14284 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14286 while (h
->root
.type
== bfd_link_hash_indirect
14287 || h
->root
.type
== bfd_link_hash_warning
)
14288 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14290 if ((h
->root
.type
== bfd_link_hash_defined
14291 || h
->root
.type
== bfd_link_hash_defweak
)
14292 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14293 || h
->root
.u
.def
.section
->kept_section
!= NULL
14294 || discarded_section (h
->root
.u
.def
.section
)))
14299 /* It's not a relocation against a global symbol,
14300 but it could be a relocation against a local
14301 symbol for a discarded section. */
14303 Elf_Internal_Sym
*isym
;
14305 /* Need to: get the symbol; get the section. */
14306 isym
= &rcookie
->locsyms
[r_symndx
];
14307 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14309 && (isec
->kept_section
!= NULL
14310 || discarded_section (isec
)))
14318 /* Discard unneeded references to discarded sections.
14319 Returns -1 on error, 1 if any section's size was changed, 0 if
14320 nothing changed. This function assumes that the relocations are in
14321 sorted order, which is true for all known assemblers. */
14324 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14326 struct elf_reloc_cookie cookie
;
14331 if (info
->traditional_format
14332 || !is_elf_hash_table (info
->hash
))
14335 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14340 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14343 || i
->reloc_count
== 0
14344 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14348 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14351 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14354 if (_bfd_discard_section_stabs (abfd
, i
,
14355 elf_section_data (i
)->sec_info
,
14356 bfd_elf_reloc_symbol_deleted_p
,
14360 fini_reloc_cookie_for_section (&cookie
, i
);
14365 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14366 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14370 int eh_changed
= 0;
14371 unsigned int eh_alignment
; /* Octets. */
14373 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14379 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14382 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14385 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14386 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14387 bfd_elf_reloc_symbol_deleted_p
,
14391 if (i
->size
!= i
->rawsize
)
14395 fini_reloc_cookie_for_section (&cookie
, i
);
14398 eh_alignment
= ((1 << o
->alignment_power
)
14399 * bfd_octets_per_byte (output_bfd
, o
));
14400 /* Skip over zero terminator, and prevent empty sections from
14401 adding alignment padding at the end. */
14402 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14404 i
->flags
|= SEC_EXCLUDE
;
14405 else if (i
->size
> 4)
14407 /* The last non-empty eh_frame section doesn't need padding. */
14410 /* Any prior sections must pad the last FDE out to the output
14411 section alignment. Otherwise we might have zero padding
14412 between sections, which would be seen as a terminator. */
14413 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14415 /* All but the last zero terminator should have been removed. */
14420 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14421 if (i
->size
!= size
)
14429 elf_link_hash_traverse (elf_hash_table (info
),
14430 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14433 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14435 const struct elf_backend_data
*bed
;
14438 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14440 s
= abfd
->sections
;
14441 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14444 bed
= get_elf_backend_data (abfd
);
14446 if (bed
->elf_backend_discard_info
!= NULL
)
14448 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14451 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14454 fini_reloc_cookie (&cookie
, abfd
);
14458 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14459 _bfd_elf_end_eh_frame_parsing (info
);
14461 if (info
->eh_frame_hdr_type
14462 && !bfd_link_relocatable (info
)
14463 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14470 _bfd_elf_section_already_linked (bfd
*abfd
,
14472 struct bfd_link_info
*info
)
14475 const char *name
, *key
;
14476 struct bfd_section_already_linked
*l
;
14477 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14479 if (sec
->output_section
== bfd_abs_section_ptr
)
14482 flags
= sec
->flags
;
14484 /* Return if it isn't a linkonce section. A comdat group section
14485 also has SEC_LINK_ONCE set. */
14486 if ((flags
& SEC_LINK_ONCE
) == 0)
14489 /* Don't put group member sections on our list of already linked
14490 sections. They are handled as a group via their group section. */
14491 if (elf_sec_group (sec
) != NULL
)
14494 /* For a SHT_GROUP section, use the group signature as the key. */
14496 if ((flags
& SEC_GROUP
) != 0
14497 && elf_next_in_group (sec
) != NULL
14498 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14499 key
= elf_group_name (elf_next_in_group (sec
));
14502 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14503 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
14504 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14507 /* Must be a user linkonce section that doesn't follow gcc's
14508 naming convention. In this case we won't be matching
14509 single member groups. */
14513 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14515 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14517 /* We may have 2 different types of sections on the list: group
14518 sections with a signature of <key> (<key> is some string),
14519 and linkonce sections named .gnu.linkonce.<type>.<key>.
14520 Match like sections. LTO plugin sections are an exception.
14521 They are always named .gnu.linkonce.t.<key> and match either
14522 type of section. */
14523 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14524 && ((flags
& SEC_GROUP
) != 0
14525 || strcmp (name
, l
->sec
->name
) == 0))
14526 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14528 /* The section has already been linked. See if we should
14529 issue a warning. */
14530 if (!_bfd_handle_already_linked (sec
, l
, info
))
14533 if (flags
& SEC_GROUP
)
14535 asection
*first
= elf_next_in_group (sec
);
14536 asection
*s
= first
;
14540 s
->output_section
= bfd_abs_section_ptr
;
14541 /* Record which group discards it. */
14542 s
->kept_section
= l
->sec
;
14543 s
= elf_next_in_group (s
);
14544 /* These lists are circular. */
14554 /* A single member comdat group section may be discarded by a
14555 linkonce section and vice versa. */
14556 if ((flags
& SEC_GROUP
) != 0)
14558 asection
*first
= elf_next_in_group (sec
);
14560 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14561 /* Check this single member group against linkonce sections. */
14562 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14563 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14564 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14566 first
->output_section
= bfd_abs_section_ptr
;
14567 first
->kept_section
= l
->sec
;
14568 sec
->output_section
= bfd_abs_section_ptr
;
14573 /* Check this linkonce section against single member groups. */
14574 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14575 if (l
->sec
->flags
& SEC_GROUP
)
14577 asection
*first
= elf_next_in_group (l
->sec
);
14580 && elf_next_in_group (first
) == first
14581 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14583 sec
->output_section
= bfd_abs_section_ptr
;
14584 sec
->kept_section
= first
;
14589 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14590 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14591 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14592 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14593 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14594 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14595 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14596 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14597 The reverse order cannot happen as there is never a bfd with only the
14598 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14599 matter as here were are looking only for cross-bfd sections. */
14601 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
14602 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14603 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14604 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
14606 if (abfd
!= l
->sec
->owner
)
14607 sec
->output_section
= bfd_abs_section_ptr
;
14611 /* This is the first section with this name. Record it. */
14612 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14613 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14614 return sec
->output_section
== bfd_abs_section_ptr
;
14618 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14620 return sym
->st_shndx
== SHN_COMMON
;
14624 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14630 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14632 return bfd_com_section_ptr
;
14636 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14637 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14638 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14639 bfd
*ibfd ATTRIBUTE_UNUSED
,
14640 unsigned long symndx ATTRIBUTE_UNUSED
)
14642 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14643 return bed
->s
->arch_size
/ 8;
14646 /* Routines to support the creation of dynamic relocs. */
14648 /* Returns the name of the dynamic reloc section associated with SEC. */
14650 static const char *
14651 get_dynamic_reloc_section_name (bfd
* abfd
,
14653 bfd_boolean is_rela
)
14656 const char *old_name
= bfd_section_name (sec
);
14657 const char *prefix
= is_rela
? ".rela" : ".rel";
14659 if (old_name
== NULL
)
14662 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14663 sprintf (name
, "%s%s", prefix
, old_name
);
14668 /* Returns the dynamic reloc section associated with SEC.
14669 If necessary compute the name of the dynamic reloc section based
14670 on SEC's name (looked up in ABFD's string table) and the setting
14674 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
14676 bfd_boolean is_rela
)
14678 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14680 if (reloc_sec
== NULL
)
14682 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14686 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14688 if (reloc_sec
!= NULL
)
14689 elf_section_data (sec
)->sreloc
= reloc_sec
;
14696 /* Returns the dynamic reloc section associated with SEC. If the
14697 section does not exist it is created and attached to the DYNOBJ
14698 bfd and stored in the SRELOC field of SEC's elf_section_data
14701 ALIGNMENT is the alignment for the newly created section and
14702 IS_RELA defines whether the name should be .rela.<SEC's name>
14703 or .rel.<SEC's name>. The section name is looked up in the
14704 string table associated with ABFD. */
14707 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14709 unsigned int alignment
,
14711 bfd_boolean is_rela
)
14713 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14715 if (reloc_sec
== NULL
)
14717 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14722 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14724 if (reloc_sec
== NULL
)
14726 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14727 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14728 if ((sec
->flags
& SEC_ALLOC
) != 0)
14729 flags
|= SEC_ALLOC
| SEC_LOAD
;
14731 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14732 if (reloc_sec
!= NULL
)
14734 /* _bfd_elf_get_sec_type_attr chooses a section type by
14735 name. Override as it may be wrong, eg. for a user
14736 section named "auto" we'll get ".relauto" which is
14737 seen to be a .rela section. */
14738 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14739 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14744 elf_section_data (sec
)->sreloc
= reloc_sec
;
14750 /* Copy the ELF symbol type and other attributes for a linker script
14751 assignment from HSRC to HDEST. Generally this should be treated as
14752 if we found a strong non-dynamic definition for HDEST (except that
14753 ld ignores multiple definition errors). */
14755 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14756 struct bfd_link_hash_entry
*hdest
,
14757 struct bfd_link_hash_entry
*hsrc
)
14759 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14760 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14761 Elf_Internal_Sym isym
;
14763 ehdest
->type
= ehsrc
->type
;
14764 ehdest
->target_internal
= ehsrc
->target_internal
;
14766 isym
.st_other
= ehsrc
->other
;
14767 elf_merge_st_other (abfd
, ehdest
, &isym
, NULL
, TRUE
, FALSE
);
14770 /* Append a RELA relocation REL to section S in BFD. */
14773 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14775 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14776 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14777 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14778 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14781 /* Append a REL relocation REL to section S in BFD. */
14784 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14786 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14787 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14788 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
14789 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
14792 /* Define __start, __stop, .startof. or .sizeof. symbol. */
14794 struct bfd_link_hash_entry
*
14795 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
14796 const char *symbol
, asection
*sec
)
14798 struct elf_link_hash_entry
*h
;
14800 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
14801 FALSE
, FALSE
, TRUE
);
14803 && (h
->root
.type
== bfd_link_hash_undefined
14804 || h
->root
.type
== bfd_link_hash_undefweak
14805 || ((h
->ref_regular
|| h
->def_dynamic
) && !h
->def_regular
)))
14807 bfd_boolean was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
14808 h
->root
.type
= bfd_link_hash_defined
;
14809 h
->root
.u
.def
.section
= sec
;
14810 h
->root
.u
.def
.value
= 0;
14811 h
->def_regular
= 1;
14812 h
->def_dynamic
= 0;
14814 h
->u2
.start_stop_section
= sec
;
14815 if (symbol
[0] == '.')
14817 /* .startof. and .sizeof. symbols are local. */
14818 const struct elf_backend_data
*bed
;
14819 bed
= get_elf_backend_data (info
->output_bfd
);
14820 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
14824 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
14825 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_PROTECTED
;
14827 bfd_elf_link_record_dynamic_symbol (info
, h
);