1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2016 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. */
23 #include "bfd_stdint.h"
28 #include "safe-ctype.h"
29 #include "libiberty.h"
31 #if BFD_SUPPORTS_PLUGINS
32 #include "plugin-api.h"
36 /* This struct is used to pass information to routines called via
37 elf_link_hash_traverse which must return failure. */
39 struct elf_info_failed
41 struct bfd_link_info
*info
;
45 /* This structure is used to pass information to
46 _bfd_elf_link_find_version_dependencies. */
48 struct elf_find_verdep_info
50 /* General link information. */
51 struct bfd_link_info
*info
;
52 /* The number of dependencies. */
54 /* Whether we had a failure. */
58 static bfd_boolean _bfd_elf_fix_symbol_flags
59 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
62 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
63 unsigned long r_symndx
,
66 if (r_symndx
>= cookie
->locsymcount
67 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
69 struct elf_link_hash_entry
*h
;
71 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
73 while (h
->root
.type
== bfd_link_hash_indirect
74 || h
->root
.type
== bfd_link_hash_warning
)
75 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
77 if ((h
->root
.type
== bfd_link_hash_defined
78 || h
->root
.type
== bfd_link_hash_defweak
)
79 && discarded_section (h
->root
.u
.def
.section
))
80 return h
->root
.u
.def
.section
;
86 /* It's not a relocation against a global symbol,
87 but it could be a relocation against a local
88 symbol for a discarded section. */
90 Elf_Internal_Sym
*isym
;
92 /* Need to: get the symbol; get the section. */
93 isym
= &cookie
->locsyms
[r_symndx
];
94 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
96 && discard
? discarded_section (isec
) : 1)
102 /* Define a symbol in a dynamic linkage section. */
104 struct elf_link_hash_entry
*
105 _bfd_elf_define_linkage_sym (bfd
*abfd
,
106 struct bfd_link_info
*info
,
110 struct elf_link_hash_entry
*h
;
111 struct bfd_link_hash_entry
*bh
;
112 const struct elf_backend_data
*bed
;
114 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
117 /* Zap symbol defined in an as-needed lib that wasn't linked.
118 This is a symptom of a larger problem: Absolute symbols
119 defined in shared libraries can't be overridden, because we
120 lose the link to the bfd which is via the symbol section. */
121 h
->root
.type
= bfd_link_hash_new
;
125 bed
= get_elf_backend_data (abfd
);
126 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
127 sec
, 0, NULL
, FALSE
, bed
->collect
,
130 h
= (struct elf_link_hash_entry
*) bh
;
133 h
->root
.linker_def
= 1;
134 h
->type
= STT_OBJECT
;
135 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
136 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
138 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
143 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
147 struct elf_link_hash_entry
*h
;
148 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
149 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
151 /* This function may be called more than once. */
152 if (htab
->sgot
!= NULL
)
155 flags
= bed
->dynamic_sec_flags
;
157 s
= bfd_make_section_anyway_with_flags (abfd
,
158 (bed
->rela_plts_and_copies_p
159 ? ".rela.got" : ".rel.got"),
160 (bed
->dynamic_sec_flags
163 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
167 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
169 || !bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
173 if (bed
->want_got_plt
)
175 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
177 || !bfd_set_section_alignment (abfd
, s
,
178 bed
->s
->log_file_align
))
183 /* The first bit of the global offset table is the header. */
184 s
->size
+= bed
->got_header_size
;
186 if (bed
->want_got_sym
)
188 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
189 (or .got.plt) section. We don't do this in the linker script
190 because we don't want to define the symbol if we are not creating
191 a global offset table. */
192 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
193 "_GLOBAL_OFFSET_TABLE_");
194 elf_hash_table (info
)->hgot
= h
;
202 /* Create a strtab to hold the dynamic symbol names. */
204 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
206 struct elf_link_hash_table
*hash_table
;
208 hash_table
= elf_hash_table (info
);
209 if (hash_table
->dynobj
== NULL
)
211 /* We may not set dynobj, an input file holding linker created
212 dynamic sections to abfd, which may be a dynamic object with
213 its own dynamic sections. We need to find a normal input file
214 to hold linker created sections if possible. */
215 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
218 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
220 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0)
226 hash_table
->dynobj
= abfd
;
229 if (hash_table
->dynstr
== NULL
)
231 hash_table
->dynstr
= _bfd_elf_strtab_init ();
232 if (hash_table
->dynstr
== NULL
)
238 /* Create some sections which will be filled in with dynamic linking
239 information. ABFD is an input file which requires dynamic sections
240 to be created. The dynamic sections take up virtual memory space
241 when the final executable is run, so we need to create them before
242 addresses are assigned to the output sections. We work out the
243 actual contents and size of these sections later. */
246 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
250 const struct elf_backend_data
*bed
;
251 struct elf_link_hash_entry
*h
;
253 if (! is_elf_hash_table (info
->hash
))
256 if (elf_hash_table (info
)->dynamic_sections_created
)
259 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
262 abfd
= elf_hash_table (info
)->dynobj
;
263 bed
= get_elf_backend_data (abfd
);
265 flags
= bed
->dynamic_sec_flags
;
267 /* A dynamically linked executable has a .interp section, but a
268 shared library does not. */
269 if (bfd_link_executable (info
) && !info
->nointerp
)
271 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
272 flags
| SEC_READONLY
);
277 /* Create sections to hold version informations. These are removed
278 if they are not needed. */
279 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
280 flags
| SEC_READONLY
);
282 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
285 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
286 flags
| SEC_READONLY
);
288 || ! bfd_set_section_alignment (abfd
, s
, 1))
291 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
292 flags
| SEC_READONLY
);
294 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
297 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
298 flags
| SEC_READONLY
);
300 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
302 elf_hash_table (info
)->dynsym
= s
;
304 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
305 flags
| SEC_READONLY
);
309 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
311 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
314 /* The special symbol _DYNAMIC is always set to the start of the
315 .dynamic section. We could set _DYNAMIC in a linker script, but we
316 only want to define it if we are, in fact, creating a .dynamic
317 section. We don't want to define it if there is no .dynamic
318 section, since on some ELF platforms the start up code examines it
319 to decide how to initialize the process. */
320 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
321 elf_hash_table (info
)->hdynamic
= h
;
327 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
328 flags
| SEC_READONLY
);
330 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
332 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
335 if (info
->emit_gnu_hash
)
337 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
338 flags
| SEC_READONLY
);
340 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
342 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
343 4 32-bit words followed by variable count of 64-bit words, then
344 variable count of 32-bit words. */
345 if (bed
->s
->arch_size
== 64)
346 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
348 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
351 /* Let the backend create the rest of the sections. This lets the
352 backend set the right flags. The backend will normally create
353 the .got and .plt sections. */
354 if (bed
->elf_backend_create_dynamic_sections
== NULL
355 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
358 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
363 /* Create dynamic sections when linking against a dynamic object. */
366 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
368 flagword flags
, pltflags
;
369 struct elf_link_hash_entry
*h
;
371 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
372 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
374 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
375 .rel[a].bss sections. */
376 flags
= bed
->dynamic_sec_flags
;
379 if (bed
->plt_not_loaded
)
380 /* We do not clear SEC_ALLOC here because we still want the OS to
381 allocate space for the section; it's just that there's nothing
382 to read in from the object file. */
383 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
385 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
386 if (bed
->plt_readonly
)
387 pltflags
|= SEC_READONLY
;
389 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
391 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
395 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
397 if (bed
->want_plt_sym
)
399 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
400 "_PROCEDURE_LINKAGE_TABLE_");
401 elf_hash_table (info
)->hplt
= h
;
406 s
= bfd_make_section_anyway_with_flags (abfd
,
407 (bed
->rela_plts_and_copies_p
408 ? ".rela.plt" : ".rel.plt"),
409 flags
| SEC_READONLY
);
411 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
415 if (! _bfd_elf_create_got_section (abfd
, info
))
418 if (bed
->want_dynbss
)
420 /* The .dynbss section is a place to put symbols which are defined
421 by dynamic objects, are referenced by regular objects, and are
422 not functions. We must allocate space for them in the process
423 image and use a R_*_COPY reloc to tell the dynamic linker to
424 initialize them at run time. The linker script puts the .dynbss
425 section into the .bss section of the final image. */
426 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
427 (SEC_ALLOC
| SEC_LINKER_CREATED
));
432 if (bed
->want_dynrelro
)
434 /* Similarly, but for symbols that were originally in read-only
436 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
437 (SEC_ALLOC
| SEC_READONLY
439 | SEC_LINKER_CREATED
));
445 /* The .rel[a].bss section holds copy relocs. This section is not
446 normally needed. We need to create it here, though, so that the
447 linker will map it to an output section. We can't just create it
448 only if we need it, because we will not know whether we need it
449 until we have seen all the input files, and the first time the
450 main linker code calls BFD after examining all the input files
451 (size_dynamic_sections) the input sections have already been
452 mapped to the output sections. If the section turns out not to
453 be needed, we can discard it later. We will never need this
454 section when generating a shared object, since they do not use
456 if (bfd_link_executable (info
))
458 s
= bfd_make_section_anyway_with_flags (abfd
,
459 (bed
->rela_plts_and_copies_p
460 ? ".rela.bss" : ".rel.bss"),
461 flags
| SEC_READONLY
);
463 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
467 if (bed
->want_dynrelro
)
469 s
= (bfd_make_section_anyway_with_flags
470 (abfd
, (bed
->rela_plts_and_copies_p
471 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
472 flags
| SEC_READONLY
));
474 || ! bfd_set_section_alignment (abfd
, s
,
475 bed
->s
->log_file_align
))
477 htab
->sreldynrelro
= s
;
485 /* Record a new dynamic symbol. We record the dynamic symbols as we
486 read the input files, since we need to have a list of all of them
487 before we can determine the final sizes of the output sections.
488 Note that we may actually call this function even though we are not
489 going to output any dynamic symbols; in some cases we know that a
490 symbol should be in the dynamic symbol table, but only if there is
494 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
495 struct elf_link_hash_entry
*h
)
497 if (h
->dynindx
== -1)
499 struct elf_strtab_hash
*dynstr
;
504 /* XXX: The ABI draft says the linker must turn hidden and
505 internal symbols into STB_LOCAL symbols when producing the
506 DSO. However, if ld.so honors st_other in the dynamic table,
507 this would not be necessary. */
508 switch (ELF_ST_VISIBILITY (h
->other
))
512 if (h
->root
.type
!= bfd_link_hash_undefined
513 && h
->root
.type
!= bfd_link_hash_undefweak
)
516 if (!elf_hash_table (info
)->is_relocatable_executable
)
524 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
525 ++elf_hash_table (info
)->dynsymcount
;
527 dynstr
= elf_hash_table (info
)->dynstr
;
530 /* Create a strtab to hold the dynamic symbol names. */
531 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
536 /* We don't put any version information in the dynamic string
538 name
= h
->root
.root
.string
;
539 p
= strchr (name
, ELF_VER_CHR
);
541 /* We know that the p points into writable memory. In fact,
542 there are only a few symbols that have read-only names, being
543 those like _GLOBAL_OFFSET_TABLE_ that are created specially
544 by the backends. Most symbols will have names pointing into
545 an ELF string table read from a file, or to objalloc memory. */
548 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
553 if (indx
== (size_t) -1)
555 h
->dynstr_index
= indx
;
561 /* Mark a symbol dynamic. */
564 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
565 struct elf_link_hash_entry
*h
,
566 Elf_Internal_Sym
*sym
)
568 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
570 /* It may be called more than once on the same H. */
571 if(h
->dynamic
|| bfd_link_relocatable (info
))
574 if ((info
->dynamic_data
575 && (h
->type
== STT_OBJECT
576 || h
->type
== STT_COMMON
578 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
579 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
581 && h
->root
.type
== bfd_link_hash_new
582 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
586 /* Record an assignment to a symbol made by a linker script. We need
587 this in case some dynamic object refers to this symbol. */
590 bfd_elf_record_link_assignment (bfd
*output_bfd
,
591 struct bfd_link_info
*info
,
596 struct elf_link_hash_entry
*h
, *hv
;
597 struct elf_link_hash_table
*htab
;
598 const struct elf_backend_data
*bed
;
600 if (!is_elf_hash_table (info
->hash
))
603 htab
= elf_hash_table (info
);
604 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
608 if (h
->root
.type
== bfd_link_hash_warning
)
609 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
611 if (h
->versioned
== unknown
)
613 /* Set versioned if symbol version is unknown. */
614 char *version
= strrchr (name
, ELF_VER_CHR
);
617 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
618 h
->versioned
= versioned_hidden
;
620 h
->versioned
= versioned
;
624 switch (h
->root
.type
)
626 case bfd_link_hash_defined
:
627 case bfd_link_hash_defweak
:
628 case bfd_link_hash_common
:
630 case bfd_link_hash_undefweak
:
631 case bfd_link_hash_undefined
:
632 /* Since we're defining the symbol, don't let it seem to have not
633 been defined. record_dynamic_symbol and size_dynamic_sections
634 may depend on this. */
635 h
->root
.type
= bfd_link_hash_new
;
636 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
637 bfd_link_repair_undef_list (&htab
->root
);
639 case bfd_link_hash_new
:
640 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
643 case bfd_link_hash_indirect
:
644 /* We had a versioned symbol in a dynamic library. We make the
645 the versioned symbol point to this one. */
646 bed
= get_elf_backend_data (output_bfd
);
648 while (hv
->root
.type
== bfd_link_hash_indirect
649 || hv
->root
.type
== bfd_link_hash_warning
)
650 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
651 /* We don't need to update h->root.u since linker will set them
653 h
->root
.type
= bfd_link_hash_undefined
;
654 hv
->root
.type
= bfd_link_hash_indirect
;
655 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
656 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
663 /* If this symbol is being provided by the linker script, and it is
664 currently defined by a dynamic object, but not by a regular
665 object, then mark it as undefined so that the generic linker will
666 force the correct value. */
670 h
->root
.type
= bfd_link_hash_undefined
;
672 /* If this symbol is not being provided by the linker script, and it is
673 currently defined by a dynamic object, but not by a regular object,
674 then clear out any version information because the symbol will not be
675 associated with the dynamic object any more. */
679 h
->verinfo
.verdef
= NULL
;
685 bed
= get_elf_backend_data (output_bfd
);
686 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
687 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
688 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
691 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
693 if (!bfd_link_relocatable (info
)
695 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
696 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
701 || bfd_link_dll (info
)
702 || elf_hash_table (info
)->is_relocatable_executable
)
705 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
708 /* If this is a weak defined symbol, and we know a corresponding
709 real symbol from the same dynamic object, make sure the real
710 symbol is also made into a dynamic symbol. */
711 if (h
->u
.weakdef
!= NULL
712 && h
->u
.weakdef
->dynindx
== -1)
714 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
722 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
723 success, and 2 on a failure caused by attempting to record a symbol
724 in a discarded section, eg. a discarded link-once section symbol. */
727 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
732 struct elf_link_local_dynamic_entry
*entry
;
733 struct elf_link_hash_table
*eht
;
734 struct elf_strtab_hash
*dynstr
;
737 Elf_External_Sym_Shndx eshndx
;
738 char esym
[sizeof (Elf64_External_Sym
)];
740 if (! is_elf_hash_table (info
->hash
))
743 /* See if the entry exists already. */
744 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
745 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
748 amt
= sizeof (*entry
);
749 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
753 /* Go find the symbol, so that we can find it's name. */
754 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
755 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
757 bfd_release (input_bfd
, entry
);
761 if (entry
->isym
.st_shndx
!= SHN_UNDEF
762 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
766 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
767 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
769 /* We can still bfd_release here as nothing has done another
770 bfd_alloc. We can't do this later in this function. */
771 bfd_release (input_bfd
, entry
);
776 name
= (bfd_elf_string_from_elf_section
777 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
778 entry
->isym
.st_name
));
780 dynstr
= elf_hash_table (info
)->dynstr
;
783 /* Create a strtab to hold the dynamic symbol names. */
784 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
789 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
790 if (dynstr_index
== (size_t) -1)
792 entry
->isym
.st_name
= dynstr_index
;
794 eht
= elf_hash_table (info
);
796 entry
->next
= eht
->dynlocal
;
797 eht
->dynlocal
= entry
;
798 entry
->input_bfd
= input_bfd
;
799 entry
->input_indx
= input_indx
;
802 /* Whatever binding the symbol had before, it's now local. */
804 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
806 /* The dynindx will be set at the end of size_dynamic_sections. */
811 /* Return the dynindex of a local dynamic symbol. */
814 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
818 struct elf_link_local_dynamic_entry
*e
;
820 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
821 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
826 /* This function is used to renumber the dynamic symbols, if some of
827 them are removed because they are marked as local. This is called
828 via elf_link_hash_traverse. */
831 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
834 size_t *count
= (size_t *) data
;
839 if (h
->dynindx
!= -1)
840 h
->dynindx
= ++(*count
);
846 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
847 STB_LOCAL binding. */
850 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
853 size_t *count
= (size_t *) data
;
855 if (!h
->forced_local
)
858 if (h
->dynindx
!= -1)
859 h
->dynindx
= ++(*count
);
864 /* Return true if the dynamic symbol for a given section should be
865 omitted when creating a shared library. */
867 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
868 struct bfd_link_info
*info
,
871 struct elf_link_hash_table
*htab
;
874 switch (elf_section_data (p
)->this_hdr
.sh_type
)
878 /* If sh_type is yet undecided, assume it could be
879 SHT_PROGBITS/SHT_NOBITS. */
881 htab
= elf_hash_table (info
);
882 if (p
== htab
->tls_sec
)
885 if (htab
->text_index_section
!= NULL
)
886 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
888 return (htab
->dynobj
!= NULL
889 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
890 && ip
->output_section
== p
);
892 /* There shouldn't be section relative relocations
893 against any other section. */
899 /* Assign dynsym indices. In a shared library we generate a section
900 symbol for each output section, which come first. Next come symbols
901 which have been forced to local binding. Then all of the back-end
902 allocated local dynamic syms, followed by the rest of the global
906 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
907 struct bfd_link_info
*info
,
908 unsigned long *section_sym_count
)
910 unsigned long dynsymcount
= 0;
912 if (bfd_link_pic (info
)
913 || elf_hash_table (info
)->is_relocatable_executable
)
915 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
917 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
918 if ((p
->flags
& SEC_EXCLUDE
) == 0
919 && (p
->flags
& SEC_ALLOC
) != 0
920 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
921 elf_section_data (p
)->dynindx
= ++dynsymcount
;
923 elf_section_data (p
)->dynindx
= 0;
925 *section_sym_count
= dynsymcount
;
927 elf_link_hash_traverse (elf_hash_table (info
),
928 elf_link_renumber_local_hash_table_dynsyms
,
931 if (elf_hash_table (info
)->dynlocal
)
933 struct elf_link_local_dynamic_entry
*p
;
934 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
935 p
->dynindx
= ++dynsymcount
;
937 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
939 elf_link_hash_traverse (elf_hash_table (info
),
940 elf_link_renumber_hash_table_dynsyms
,
943 /* There is an unused NULL entry at the head of the table which we
944 must account for in our count even if the table is empty since it
945 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
949 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
953 /* Merge st_other field. */
956 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
957 const Elf_Internal_Sym
*isym
, asection
*sec
,
958 bfd_boolean definition
, bfd_boolean dynamic
)
960 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
962 /* If st_other has a processor-specific meaning, specific
963 code might be needed here. */
964 if (bed
->elf_backend_merge_symbol_attribute
)
965 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
970 unsigned symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
971 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
973 /* Keep the most constraining visibility. Leave the remainder
974 of the st_other field to elf_backend_merge_symbol_attribute. */
975 if (symvis
- 1 < hvis
- 1)
976 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
979 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_DEFAULT
980 && (sec
->flags
& SEC_READONLY
) == 0)
981 h
->protected_def
= 1;
984 /* This function is called when we want to merge a new symbol with an
985 existing symbol. It handles the various cases which arise when we
986 find a definition in a dynamic object, or when there is already a
987 definition in a dynamic object. The new symbol is described by
988 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
989 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
990 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
991 of an old common symbol. We set OVERRIDE if the old symbol is
992 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
993 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
994 to change. By OK to change, we mean that we shouldn't warn if the
995 type or size does change. */
998 _bfd_elf_merge_symbol (bfd
*abfd
,
999 struct bfd_link_info
*info
,
1001 Elf_Internal_Sym
*sym
,
1004 struct elf_link_hash_entry
**sym_hash
,
1006 bfd_boolean
*pold_weak
,
1007 unsigned int *pold_alignment
,
1009 bfd_boolean
*override
,
1010 bfd_boolean
*type_change_ok
,
1011 bfd_boolean
*size_change_ok
,
1012 bfd_boolean
*matched
)
1014 asection
*sec
, *oldsec
;
1015 struct elf_link_hash_entry
*h
;
1016 struct elf_link_hash_entry
*hi
;
1017 struct elf_link_hash_entry
*flip
;
1020 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1021 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
1022 const struct elf_backend_data
*bed
;
1029 bind
= ELF_ST_BIND (sym
->st_info
);
1031 if (! bfd_is_und_section (sec
))
1032 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
1034 h
= ((struct elf_link_hash_entry
*)
1035 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
1040 bed
= get_elf_backend_data (abfd
);
1042 /* NEW_VERSION is the symbol version of the new symbol. */
1043 if (h
->versioned
!= unversioned
)
1045 /* Symbol version is unknown or versioned. */
1046 new_version
= strrchr (name
, ELF_VER_CHR
);
1049 if (h
->versioned
== unknown
)
1051 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1052 h
->versioned
= versioned_hidden
;
1054 h
->versioned
= versioned
;
1057 if (new_version
[0] == '\0')
1061 h
->versioned
= unversioned
;
1066 /* For merging, we only care about real symbols. But we need to make
1067 sure that indirect symbol dynamic flags are updated. */
1069 while (h
->root
.type
== bfd_link_hash_indirect
1070 || h
->root
.type
== bfd_link_hash_warning
)
1071 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1075 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1079 /* OLD_HIDDEN is true if the existing symbol is only visible
1080 to the symbol with the same symbol version. NEW_HIDDEN is
1081 true if the new symbol is only visible to the symbol with
1082 the same symbol version. */
1083 bfd_boolean old_hidden
= h
->versioned
== versioned_hidden
;
1084 bfd_boolean new_hidden
= hi
->versioned
== versioned_hidden
;
1085 if (!old_hidden
&& !new_hidden
)
1086 /* The new symbol matches the existing symbol if both
1091 /* OLD_VERSION is the symbol version of the existing
1095 if (h
->versioned
>= versioned
)
1096 old_version
= strrchr (h
->root
.root
.string
,
1101 /* The new symbol matches the existing symbol if they
1102 have the same symbol version. */
1103 *matched
= (old_version
== new_version
1104 || (old_version
!= NULL
1105 && new_version
!= NULL
1106 && strcmp (old_version
, new_version
) == 0));
1111 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1116 switch (h
->root
.type
)
1121 case bfd_link_hash_undefined
:
1122 case bfd_link_hash_undefweak
:
1123 oldbfd
= h
->root
.u
.undef
.abfd
;
1126 case bfd_link_hash_defined
:
1127 case bfd_link_hash_defweak
:
1128 oldbfd
= h
->root
.u
.def
.section
->owner
;
1129 oldsec
= h
->root
.u
.def
.section
;
1132 case bfd_link_hash_common
:
1133 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1134 oldsec
= h
->root
.u
.c
.p
->section
;
1136 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1139 if (poldbfd
&& *poldbfd
== NULL
)
1142 /* Differentiate strong and weak symbols. */
1143 newweak
= bind
== STB_WEAK
;
1144 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1145 || h
->root
.type
== bfd_link_hash_undefweak
);
1147 *pold_weak
= oldweak
;
1149 /* This code is for coping with dynamic objects, and is only useful
1150 if we are doing an ELF link. */
1151 if (!(*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
1154 /* We have to check it for every instance since the first few may be
1155 references and not all compilers emit symbol type for undefined
1157 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1159 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1160 respectively, is from a dynamic object. */
1162 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1164 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1165 syms and defined syms in dynamic libraries respectively.
1166 ref_dynamic on the other hand can be set for a symbol defined in
1167 a dynamic library, and def_dynamic may not be set; When the
1168 definition in a dynamic lib is overridden by a definition in the
1169 executable use of the symbol in the dynamic lib becomes a
1170 reference to the executable symbol. */
1173 if (bfd_is_und_section (sec
))
1175 if (bind
!= STB_WEAK
)
1177 h
->ref_dynamic_nonweak
= 1;
1178 hi
->ref_dynamic_nonweak
= 1;
1183 /* Update the existing symbol only if they match. */
1186 hi
->dynamic_def
= 1;
1190 /* If we just created the symbol, mark it as being an ELF symbol.
1191 Other than that, there is nothing to do--there is no merge issue
1192 with a newly defined symbol--so we just return. */
1194 if (h
->root
.type
== bfd_link_hash_new
)
1200 /* In cases involving weak versioned symbols, we may wind up trying
1201 to merge a symbol with itself. Catch that here, to avoid the
1202 confusion that results if we try to override a symbol with
1203 itself. The additional tests catch cases like
1204 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1205 dynamic object, which we do want to handle here. */
1207 && (newweak
|| oldweak
)
1208 && ((abfd
->flags
& DYNAMIC
) == 0
1209 || !h
->def_regular
))
1214 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1215 else if (oldsec
!= NULL
)
1217 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1218 indices used by MIPS ELF. */
1219 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1222 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1223 respectively, appear to be a definition rather than reference. */
1225 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1227 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1228 && h
->root
.type
!= bfd_link_hash_undefweak
1229 && h
->root
.type
!= bfd_link_hash_common
);
1231 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1232 respectively, appear to be a function. */
1234 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1235 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1237 oldfunc
= (h
->type
!= STT_NOTYPE
1238 && bed
->is_function_type (h
->type
));
1240 /* If creating a default indirect symbol ("foo" or "foo@") from a
1241 dynamic versioned definition ("foo@@") skip doing so if there is
1242 an existing regular definition with a different type. We don't
1243 want, for example, a "time" variable in the executable overriding
1244 a "time" function in a shared library. */
1245 if (pold_alignment
== NULL
1249 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
1250 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1251 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1252 && h
->type
!= STT_NOTYPE
1253 && !(newfunc
&& oldfunc
))
1259 /* Check TLS symbols. We don't check undefined symbols introduced
1260 by "ld -u" which have no type (and oldbfd NULL), and we don't
1261 check symbols from plugins because they also have no type. */
1263 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1264 && (abfd
->flags
& BFD_PLUGIN
) == 0
1265 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1266 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1269 bfd_boolean ntdef
, tdef
;
1270 asection
*ntsec
, *tsec
;
1272 if (h
->type
== STT_TLS
)
1293 /* xgettext:c-format */
1294 (_("%s: TLS definition in %B section %A "
1295 "mismatches non-TLS definition in %B section %A"),
1296 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1297 else if (!tdef
&& !ntdef
)
1299 /* xgettext:c-format */
1300 (_("%s: TLS reference in %B "
1301 "mismatches non-TLS reference in %B"),
1302 tbfd
, ntbfd
, h
->root
.root
.string
);
1305 /* xgettext:c-format */
1306 (_("%s: TLS definition in %B section %A "
1307 "mismatches non-TLS reference in %B"),
1308 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1311 /* xgettext:c-format */
1312 (_("%s: TLS reference in %B "
1313 "mismatches non-TLS definition in %B section %A"),
1314 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1316 bfd_set_error (bfd_error_bad_value
);
1320 /* If the old symbol has non-default visibility, we ignore the new
1321 definition from a dynamic object. */
1323 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1324 && !bfd_is_und_section (sec
))
1327 /* Make sure this symbol is dynamic. */
1329 hi
->ref_dynamic
= 1;
1330 /* A protected symbol has external availability. Make sure it is
1331 recorded as dynamic.
1333 FIXME: Should we check type and size for protected symbol? */
1334 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1335 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1340 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1343 /* If the new symbol with non-default visibility comes from a
1344 relocatable file and the old definition comes from a dynamic
1345 object, we remove the old definition. */
1346 if (hi
->root
.type
== bfd_link_hash_indirect
)
1348 /* Handle the case where the old dynamic definition is
1349 default versioned. We need to copy the symbol info from
1350 the symbol with default version to the normal one if it
1351 was referenced before. */
1354 hi
->root
.type
= h
->root
.type
;
1355 h
->root
.type
= bfd_link_hash_indirect
;
1356 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1358 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1359 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1361 /* If the new symbol is hidden or internal, completely undo
1362 any dynamic link state. */
1363 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1364 h
->forced_local
= 0;
1371 /* FIXME: Should we check type and size for protected symbol? */
1381 /* If the old symbol was undefined before, then it will still be
1382 on the undefs list. If the new symbol is undefined or
1383 common, we can't make it bfd_link_hash_new here, because new
1384 undefined or common symbols will be added to the undefs list
1385 by _bfd_generic_link_add_one_symbol. Symbols may not be
1386 added twice to the undefs list. Also, if the new symbol is
1387 undefweak then we don't want to lose the strong undef. */
1388 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1390 h
->root
.type
= bfd_link_hash_undefined
;
1391 h
->root
.u
.undef
.abfd
= abfd
;
1395 h
->root
.type
= bfd_link_hash_new
;
1396 h
->root
.u
.undef
.abfd
= NULL
;
1399 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1401 /* If the new symbol is hidden or internal, completely undo
1402 any dynamic link state. */
1403 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1404 h
->forced_local
= 0;
1410 /* FIXME: Should we check type and size for protected symbol? */
1416 /* If a new weak symbol definition comes from a regular file and the
1417 old symbol comes from a dynamic library, we treat the new one as
1418 strong. Similarly, an old weak symbol definition from a regular
1419 file is treated as strong when the new symbol comes from a dynamic
1420 library. Further, an old weak symbol from a dynamic library is
1421 treated as strong if the new symbol is from a dynamic library.
1422 This reflects the way glibc's ld.so works.
1424 Do this before setting *type_change_ok or *size_change_ok so that
1425 we warn properly when dynamic library symbols are overridden. */
1427 if (newdef
&& !newdyn
&& olddyn
)
1429 if (olddef
&& newdyn
)
1432 /* Allow changes between different types of function symbol. */
1433 if (newfunc
&& oldfunc
)
1434 *type_change_ok
= TRUE
;
1436 /* It's OK to change the type if either the existing symbol or the
1437 new symbol is weak. A type change is also OK if the old symbol
1438 is undefined and the new symbol is defined. */
1443 && h
->root
.type
== bfd_link_hash_undefined
))
1444 *type_change_ok
= TRUE
;
1446 /* It's OK to change the size if either the existing symbol or the
1447 new symbol is weak, or if the old symbol is undefined. */
1450 || h
->root
.type
== bfd_link_hash_undefined
)
1451 *size_change_ok
= TRUE
;
1453 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1454 symbol, respectively, appears to be a common symbol in a dynamic
1455 object. If a symbol appears in an uninitialized section, and is
1456 not weak, and is not a function, then it may be a common symbol
1457 which was resolved when the dynamic object was created. We want
1458 to treat such symbols specially, because they raise special
1459 considerations when setting the symbol size: if the symbol
1460 appears as a common symbol in a regular object, and the size in
1461 the regular object is larger, we must make sure that we use the
1462 larger size. This problematic case can always be avoided in C,
1463 but it must be handled correctly when using Fortran shared
1466 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1467 likewise for OLDDYNCOMMON and OLDDEF.
1469 Note that this test is just a heuristic, and that it is quite
1470 possible to have an uninitialized symbol in a shared object which
1471 is really a definition, rather than a common symbol. This could
1472 lead to some minor confusion when the symbol really is a common
1473 symbol in some regular object. However, I think it will be
1479 && (sec
->flags
& SEC_ALLOC
) != 0
1480 && (sec
->flags
& SEC_LOAD
) == 0
1483 newdyncommon
= TRUE
;
1485 newdyncommon
= FALSE
;
1489 && h
->root
.type
== bfd_link_hash_defined
1491 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1492 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1495 olddyncommon
= TRUE
;
1497 olddyncommon
= FALSE
;
1499 /* We now know everything about the old and new symbols. We ask the
1500 backend to check if we can merge them. */
1501 if (bed
->merge_symbol
!= NULL
)
1503 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1508 /* If both the old and the new symbols look like common symbols in a
1509 dynamic object, set the size of the symbol to the larger of the
1514 && sym
->st_size
!= h
->size
)
1516 /* Since we think we have two common symbols, issue a multiple
1517 common warning if desired. Note that we only warn if the
1518 size is different. If the size is the same, we simply let
1519 the old symbol override the new one as normally happens with
1520 symbols defined in dynamic objects. */
1522 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1523 bfd_link_hash_common
, sym
->st_size
);
1524 if (sym
->st_size
> h
->size
)
1525 h
->size
= sym
->st_size
;
1527 *size_change_ok
= TRUE
;
1530 /* If we are looking at a dynamic object, and we have found a
1531 definition, we need to see if the symbol was already defined by
1532 some other object. If so, we want to use the existing
1533 definition, and we do not want to report a multiple symbol
1534 definition error; we do this by clobbering *PSEC to be
1535 bfd_und_section_ptr.
1537 We treat a common symbol as a definition if the symbol in the
1538 shared library is a function, since common symbols always
1539 represent variables; this can cause confusion in principle, but
1540 any such confusion would seem to indicate an erroneous program or
1541 shared library. We also permit a common symbol in a regular
1542 object to override a weak symbol in a shared object. A common
1543 symbol in executable also overrides a symbol in a shared object. */
1548 || (h
->root
.type
== bfd_link_hash_common
1551 || (!olddyn
&& bfd_link_executable (info
))))))
1555 newdyncommon
= FALSE
;
1557 *psec
= sec
= bfd_und_section_ptr
;
1558 *size_change_ok
= TRUE
;
1560 /* If we get here when the old symbol is a common symbol, then
1561 we are explicitly letting it override a weak symbol or
1562 function in a dynamic object, and we don't want to warn about
1563 a type change. If the old symbol is a defined symbol, a type
1564 change warning may still be appropriate. */
1566 if (h
->root
.type
== bfd_link_hash_common
)
1567 *type_change_ok
= TRUE
;
1570 /* Handle the special case of an old common symbol merging with a
1571 new symbol which looks like a common symbol in a shared object.
1572 We change *PSEC and *PVALUE to make the new symbol look like a
1573 common symbol, and let _bfd_generic_link_add_one_symbol do the
1577 && h
->root
.type
== bfd_link_hash_common
)
1581 newdyncommon
= FALSE
;
1582 *pvalue
= sym
->st_size
;
1583 *psec
= sec
= bed
->common_section (oldsec
);
1584 *size_change_ok
= TRUE
;
1587 /* Skip weak definitions of symbols that are already defined. */
1588 if (newdef
&& olddef
&& newweak
)
1590 /* Don't skip new non-IR weak syms. */
1591 if (!(oldbfd
!= NULL
1592 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1593 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1599 /* Merge st_other. If the symbol already has a dynamic index,
1600 but visibility says it should not be visible, turn it into a
1602 elf_merge_st_other (abfd
, h
, sym
, sec
, newdef
, newdyn
);
1603 if (h
->dynindx
!= -1)
1604 switch (ELF_ST_VISIBILITY (h
->other
))
1608 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1613 /* If the old symbol is from a dynamic object, and the new symbol is
1614 a definition which is not from a dynamic object, then the new
1615 symbol overrides the old symbol. Symbols from regular files
1616 always take precedence over symbols from dynamic objects, even if
1617 they are defined after the dynamic object in the link.
1619 As above, we again permit a common symbol in a regular object to
1620 override a definition in a shared object if the shared object
1621 symbol is a function or is weak. */
1626 || (bfd_is_com_section (sec
)
1627 && (oldweak
|| oldfunc
)))
1632 /* Change the hash table entry to undefined, and let
1633 _bfd_generic_link_add_one_symbol do the right thing with the
1636 h
->root
.type
= bfd_link_hash_undefined
;
1637 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1638 *size_change_ok
= TRUE
;
1641 olddyncommon
= FALSE
;
1643 /* We again permit a type change when a common symbol may be
1644 overriding a function. */
1646 if (bfd_is_com_section (sec
))
1650 /* If a common symbol overrides a function, make sure
1651 that it isn't defined dynamically nor has type
1654 h
->type
= STT_NOTYPE
;
1656 *type_change_ok
= TRUE
;
1659 if (hi
->root
.type
== bfd_link_hash_indirect
)
1662 /* This union may have been set to be non-NULL when this symbol
1663 was seen in a dynamic object. We must force the union to be
1664 NULL, so that it is correct for a regular symbol. */
1665 h
->verinfo
.vertree
= NULL
;
1668 /* Handle the special case of a new common symbol merging with an
1669 old symbol that looks like it might be a common symbol defined in
1670 a shared object. Note that we have already handled the case in
1671 which a new common symbol should simply override the definition
1672 in the shared library. */
1675 && bfd_is_com_section (sec
)
1678 /* It would be best if we could set the hash table entry to a
1679 common symbol, but we don't know what to use for the section
1680 or the alignment. */
1681 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1682 bfd_link_hash_common
, sym
->st_size
);
1684 /* If the presumed common symbol in the dynamic object is
1685 larger, pretend that the new symbol has its size. */
1687 if (h
->size
> *pvalue
)
1690 /* We need to remember the alignment required by the symbol
1691 in the dynamic object. */
1692 BFD_ASSERT (pold_alignment
);
1693 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1696 olddyncommon
= FALSE
;
1698 h
->root
.type
= bfd_link_hash_undefined
;
1699 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1701 *size_change_ok
= TRUE
;
1702 *type_change_ok
= TRUE
;
1704 if (hi
->root
.type
== bfd_link_hash_indirect
)
1707 h
->verinfo
.vertree
= NULL
;
1712 /* Handle the case where we had a versioned symbol in a dynamic
1713 library and now find a definition in a normal object. In this
1714 case, we make the versioned symbol point to the normal one. */
1715 flip
->root
.type
= h
->root
.type
;
1716 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1717 h
->root
.type
= bfd_link_hash_indirect
;
1718 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1719 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1723 flip
->ref_dynamic
= 1;
1730 /* This function is called to create an indirect symbol from the
1731 default for the symbol with the default version if needed. The
1732 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1733 set DYNSYM if the new indirect symbol is dynamic. */
1736 _bfd_elf_add_default_symbol (bfd
*abfd
,
1737 struct bfd_link_info
*info
,
1738 struct elf_link_hash_entry
*h
,
1740 Elf_Internal_Sym
*sym
,
1744 bfd_boolean
*dynsym
)
1746 bfd_boolean type_change_ok
;
1747 bfd_boolean size_change_ok
;
1750 struct elf_link_hash_entry
*hi
;
1751 struct bfd_link_hash_entry
*bh
;
1752 const struct elf_backend_data
*bed
;
1753 bfd_boolean collect
;
1754 bfd_boolean dynamic
;
1755 bfd_boolean override
;
1757 size_t len
, shortlen
;
1759 bfd_boolean matched
;
1761 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1764 /* If this symbol has a version, and it is the default version, we
1765 create an indirect symbol from the default name to the fully
1766 decorated name. This will cause external references which do not
1767 specify a version to be bound to this version of the symbol. */
1768 p
= strchr (name
, ELF_VER_CHR
);
1769 if (h
->versioned
== unknown
)
1773 h
->versioned
= unversioned
;
1778 if (p
[1] != ELF_VER_CHR
)
1780 h
->versioned
= versioned_hidden
;
1784 h
->versioned
= versioned
;
1789 /* PR ld/19073: We may see an unversioned definition after the
1795 bed
= get_elf_backend_data (abfd
);
1796 collect
= bed
->collect
;
1797 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1799 shortlen
= p
- name
;
1800 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1801 if (shortname
== NULL
)
1803 memcpy (shortname
, name
, shortlen
);
1804 shortname
[shortlen
] = '\0';
1806 /* We are going to create a new symbol. Merge it with any existing
1807 symbol with this name. For the purposes of the merge, act as
1808 though we were defining the symbol we just defined, although we
1809 actually going to define an indirect symbol. */
1810 type_change_ok
= FALSE
;
1811 size_change_ok
= FALSE
;
1814 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1815 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1816 &type_change_ok
, &size_change_ok
, &matched
))
1822 if (hi
->def_regular
)
1824 /* If the undecorated symbol will have a version added by a
1825 script different to H, then don't indirect to/from the
1826 undecorated symbol. This isn't ideal because we may not yet
1827 have seen symbol versions, if given by a script on the
1828 command line rather than via --version-script. */
1829 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1834 = bfd_find_version_for_sym (info
->version_info
,
1835 hi
->root
.root
.string
, &hide
);
1836 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1838 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
1842 if (hi
->verinfo
.vertree
!= NULL
1843 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1849 /* Add the default symbol if not performing a relocatable link. */
1850 if (! bfd_link_relocatable (info
))
1853 if (! (_bfd_generic_link_add_one_symbol
1854 (info
, abfd
, shortname
, BSF_INDIRECT
,
1855 bfd_ind_section_ptr
,
1856 0, name
, FALSE
, collect
, &bh
)))
1858 hi
= (struct elf_link_hash_entry
*) bh
;
1863 /* In this case the symbol named SHORTNAME is overriding the
1864 indirect symbol we want to add. We were planning on making
1865 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1866 is the name without a version. NAME is the fully versioned
1867 name, and it is the default version.
1869 Overriding means that we already saw a definition for the
1870 symbol SHORTNAME in a regular object, and it is overriding
1871 the symbol defined in the dynamic object.
1873 When this happens, we actually want to change NAME, the
1874 symbol we just added, to refer to SHORTNAME. This will cause
1875 references to NAME in the shared object to become references
1876 to SHORTNAME in the regular object. This is what we expect
1877 when we override a function in a shared object: that the
1878 references in the shared object will be mapped to the
1879 definition in the regular object. */
1881 while (hi
->root
.type
== bfd_link_hash_indirect
1882 || hi
->root
.type
== bfd_link_hash_warning
)
1883 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1885 h
->root
.type
= bfd_link_hash_indirect
;
1886 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1890 hi
->ref_dynamic
= 1;
1894 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1899 /* Now set HI to H, so that the following code will set the
1900 other fields correctly. */
1904 /* Check if HI is a warning symbol. */
1905 if (hi
->root
.type
== bfd_link_hash_warning
)
1906 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1908 /* If there is a duplicate definition somewhere, then HI may not
1909 point to an indirect symbol. We will have reported an error to
1910 the user in that case. */
1912 if (hi
->root
.type
== bfd_link_hash_indirect
)
1914 struct elf_link_hash_entry
*ht
;
1916 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1917 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1919 /* A reference to the SHORTNAME symbol from a dynamic library
1920 will be satisfied by the versioned symbol at runtime. In
1921 effect, we have a reference to the versioned symbol. */
1922 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
1923 hi
->dynamic_def
|= ht
->dynamic_def
;
1925 /* See if the new flags lead us to realize that the symbol must
1931 if (! bfd_link_executable (info
)
1938 if (hi
->ref_regular
)
1944 /* We also need to define an indirection from the nondefault version
1948 len
= strlen (name
);
1949 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
1950 if (shortname
== NULL
)
1952 memcpy (shortname
, name
, shortlen
);
1953 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1955 /* Once again, merge with any existing symbol. */
1956 type_change_ok
= FALSE
;
1957 size_change_ok
= FALSE
;
1959 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1960 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1961 &type_change_ok
, &size_change_ok
, &matched
))
1969 /* Here SHORTNAME is a versioned name, so we don't expect to see
1970 the type of override we do in the case above unless it is
1971 overridden by a versioned definition. */
1972 if (hi
->root
.type
!= bfd_link_hash_defined
1973 && hi
->root
.type
!= bfd_link_hash_defweak
)
1975 /* xgettext:c-format */
1976 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1982 if (! (_bfd_generic_link_add_one_symbol
1983 (info
, abfd
, shortname
, BSF_INDIRECT
,
1984 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1986 hi
= (struct elf_link_hash_entry
*) bh
;
1988 /* If there is a duplicate definition somewhere, then HI may not
1989 point to an indirect symbol. We will have reported an error
1990 to the user in that case. */
1992 if (hi
->root
.type
== bfd_link_hash_indirect
)
1994 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1995 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
1996 hi
->dynamic_def
|= h
->dynamic_def
;
1998 /* See if the new flags lead us to realize that the symbol
2004 if (! bfd_link_executable (info
)
2010 if (hi
->ref_regular
)
2020 /* This routine is used to export all defined symbols into the dynamic
2021 symbol table. It is called via elf_link_hash_traverse. */
2024 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2026 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2028 /* Ignore indirect symbols. These are added by the versioning code. */
2029 if (h
->root
.type
== bfd_link_hash_indirect
)
2032 /* Ignore this if we won't export it. */
2033 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2036 if (h
->dynindx
== -1
2037 && (h
->def_regular
|| h
->ref_regular
)
2038 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2039 h
->root
.root
.string
))
2041 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2051 /* Look through the symbols which are defined in other shared
2052 libraries and referenced here. Update the list of version
2053 dependencies. This will be put into the .gnu.version_r section.
2054 This function is called via elf_link_hash_traverse. */
2057 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2060 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2061 Elf_Internal_Verneed
*t
;
2062 Elf_Internal_Vernaux
*a
;
2065 /* We only care about symbols defined in shared objects with version
2070 || h
->verinfo
.verdef
== NULL
2071 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2072 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2075 /* See if we already know about this version. */
2076 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2080 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2083 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2084 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2090 /* This is a new version. Add it to tree we are building. */
2095 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2098 rinfo
->failed
= TRUE
;
2102 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2103 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2104 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2108 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2111 rinfo
->failed
= TRUE
;
2115 /* Note that we are copying a string pointer here, and testing it
2116 above. If bfd_elf_string_from_elf_section is ever changed to
2117 discard the string data when low in memory, this will have to be
2119 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2121 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2122 a
->vna_nextptr
= t
->vn_auxptr
;
2124 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2127 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2134 /* Figure out appropriate versions for all the symbols. We may not
2135 have the version number script until we have read all of the input
2136 files, so until that point we don't know which symbols should be
2137 local. This function is called via elf_link_hash_traverse. */
2140 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2142 struct elf_info_failed
*sinfo
;
2143 struct bfd_link_info
*info
;
2144 const struct elf_backend_data
*bed
;
2145 struct elf_info_failed eif
;
2148 sinfo
= (struct elf_info_failed
*) data
;
2151 /* Fix the symbol flags. */
2154 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2157 sinfo
->failed
= TRUE
;
2161 /* We only need version numbers for symbols defined in regular
2163 if (!h
->def_regular
)
2166 bed
= get_elf_backend_data (info
->output_bfd
);
2167 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2168 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2170 struct bfd_elf_version_tree
*t
;
2173 if (*p
== ELF_VER_CHR
)
2176 /* If there is no version string, we can just return out. */
2180 /* Look for the version. If we find it, it is no longer weak. */
2181 for (t
= sinfo
->info
->version_info
; t
!= NULL
; t
= t
->next
)
2183 if (strcmp (t
->name
, p
) == 0)
2187 struct bfd_elf_version_expr
*d
;
2189 len
= p
- h
->root
.root
.string
;
2190 alc
= (char *) bfd_malloc (len
);
2193 sinfo
->failed
= TRUE
;
2196 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2197 alc
[len
- 1] = '\0';
2198 if (alc
[len
- 2] == ELF_VER_CHR
)
2199 alc
[len
- 2] = '\0';
2201 h
->verinfo
.vertree
= t
;
2205 if (t
->globals
.list
!= NULL
)
2206 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2208 /* See if there is anything to force this symbol to
2210 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2212 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2215 && ! info
->export_dynamic
)
2216 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2224 /* If we are building an application, we need to create a
2225 version node for this version. */
2226 if (t
== NULL
&& bfd_link_executable (info
))
2228 struct bfd_elf_version_tree
**pp
;
2231 /* If we aren't going to export this symbol, we don't need
2232 to worry about it. */
2233 if (h
->dynindx
== -1)
2236 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2240 sinfo
->failed
= TRUE
;
2245 t
->name_indx
= (unsigned int) -1;
2249 /* Don't count anonymous version tag. */
2250 if (sinfo
->info
->version_info
!= NULL
2251 && sinfo
->info
->version_info
->vernum
== 0)
2253 for (pp
= &sinfo
->info
->version_info
;
2257 t
->vernum
= version_index
;
2261 h
->verinfo
.vertree
= t
;
2265 /* We could not find the version for a symbol when
2266 generating a shared archive. Return an error. */
2268 /* xgettext:c-format */
2269 (_("%B: version node not found for symbol %s"),
2270 info
->output_bfd
, h
->root
.root
.string
);
2271 bfd_set_error (bfd_error_bad_value
);
2272 sinfo
->failed
= TRUE
;
2277 /* If we don't have a version for this symbol, see if we can find
2279 if (h
->verinfo
.vertree
== NULL
&& sinfo
->info
->version_info
!= NULL
)
2284 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2285 h
->root
.root
.string
, &hide
);
2286 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2287 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2293 /* Read and swap the relocs from the section indicated by SHDR. This
2294 may be either a REL or a RELA section. The relocations are
2295 translated into RELA relocations and stored in INTERNAL_RELOCS,
2296 which should have already been allocated to contain enough space.
2297 The EXTERNAL_RELOCS are a buffer where the external form of the
2298 relocations should be stored.
2300 Returns FALSE if something goes wrong. */
2303 elf_link_read_relocs_from_section (bfd
*abfd
,
2305 Elf_Internal_Shdr
*shdr
,
2306 void *external_relocs
,
2307 Elf_Internal_Rela
*internal_relocs
)
2309 const struct elf_backend_data
*bed
;
2310 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2311 const bfd_byte
*erela
;
2312 const bfd_byte
*erelaend
;
2313 Elf_Internal_Rela
*irela
;
2314 Elf_Internal_Shdr
*symtab_hdr
;
2317 /* Position ourselves at the start of the section. */
2318 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2321 /* Read the relocations. */
2322 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2325 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2326 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2328 bed
= get_elf_backend_data (abfd
);
2330 /* Convert the external relocations to the internal format. */
2331 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2332 swap_in
= bed
->s
->swap_reloc_in
;
2333 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2334 swap_in
= bed
->s
->swap_reloca_in
;
2337 bfd_set_error (bfd_error_wrong_format
);
2341 erela
= (const bfd_byte
*) external_relocs
;
2342 erelaend
= erela
+ shdr
->sh_size
;
2343 irela
= internal_relocs
;
2344 while (erela
< erelaend
)
2348 (*swap_in
) (abfd
, erela
, irela
);
2349 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2350 if (bed
->s
->arch_size
== 64)
2354 if ((size_t) r_symndx
>= nsyms
)
2357 /* xgettext:c-format */
2358 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2359 " for offset 0x%lx in section `%A'"),
2361 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2362 bfd_set_error (bfd_error_bad_value
);
2366 else if (r_symndx
!= STN_UNDEF
)
2369 /* xgettext:c-format */
2370 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2371 " when the object file has no symbol table"),
2373 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2374 bfd_set_error (bfd_error_bad_value
);
2377 irela
+= bed
->s
->int_rels_per_ext_rel
;
2378 erela
+= shdr
->sh_entsize
;
2384 /* Read and swap the relocs for a section O. They may have been
2385 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2386 not NULL, they are used as buffers to read into. They are known to
2387 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2388 the return value is allocated using either malloc or bfd_alloc,
2389 according to the KEEP_MEMORY argument. If O has two relocation
2390 sections (both REL and RELA relocations), then the REL_HDR
2391 relocations will appear first in INTERNAL_RELOCS, followed by the
2392 RELA_HDR relocations. */
2395 _bfd_elf_link_read_relocs (bfd
*abfd
,
2397 void *external_relocs
,
2398 Elf_Internal_Rela
*internal_relocs
,
2399 bfd_boolean keep_memory
)
2401 void *alloc1
= NULL
;
2402 Elf_Internal_Rela
*alloc2
= NULL
;
2403 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2404 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2405 Elf_Internal_Rela
*internal_rela_relocs
;
2407 if (esdo
->relocs
!= NULL
)
2408 return esdo
->relocs
;
2410 if (o
->reloc_count
== 0)
2413 if (internal_relocs
== NULL
)
2417 size
= o
->reloc_count
;
2418 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2420 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2422 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2423 if (internal_relocs
== NULL
)
2427 if (external_relocs
== NULL
)
2429 bfd_size_type size
= 0;
2432 size
+= esdo
->rel
.hdr
->sh_size
;
2434 size
+= esdo
->rela
.hdr
->sh_size
;
2436 alloc1
= bfd_malloc (size
);
2439 external_relocs
= alloc1
;
2442 internal_rela_relocs
= internal_relocs
;
2445 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2449 external_relocs
= (((bfd_byte
*) external_relocs
)
2450 + esdo
->rel
.hdr
->sh_size
);
2451 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2452 * bed
->s
->int_rels_per_ext_rel
);
2456 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2458 internal_rela_relocs
)))
2461 /* Cache the results for next time, if we can. */
2463 esdo
->relocs
= internal_relocs
;
2468 /* Don't free alloc2, since if it was allocated we are passing it
2469 back (under the name of internal_relocs). */
2471 return internal_relocs
;
2479 bfd_release (abfd
, alloc2
);
2486 /* Compute the size of, and allocate space for, REL_HDR which is the
2487 section header for a section containing relocations for O. */
2490 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2491 struct bfd_elf_section_reloc_data
*reldata
)
2493 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2495 /* That allows us to calculate the size of the section. */
2496 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2498 /* The contents field must last into write_object_contents, so we
2499 allocate it with bfd_alloc rather than malloc. Also since we
2500 cannot be sure that the contents will actually be filled in,
2501 we zero the allocated space. */
2502 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2503 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2506 if (reldata
->hashes
== NULL
&& reldata
->count
)
2508 struct elf_link_hash_entry
**p
;
2510 p
= ((struct elf_link_hash_entry
**)
2511 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2515 reldata
->hashes
= p
;
2521 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2522 originated from the section given by INPUT_REL_HDR) to the
2526 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2527 asection
*input_section
,
2528 Elf_Internal_Shdr
*input_rel_hdr
,
2529 Elf_Internal_Rela
*internal_relocs
,
2530 struct elf_link_hash_entry
**rel_hash
2533 Elf_Internal_Rela
*irela
;
2534 Elf_Internal_Rela
*irelaend
;
2536 struct bfd_elf_section_reloc_data
*output_reldata
;
2537 asection
*output_section
;
2538 const struct elf_backend_data
*bed
;
2539 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2540 struct bfd_elf_section_data
*esdo
;
2542 output_section
= input_section
->output_section
;
2544 bed
= get_elf_backend_data (output_bfd
);
2545 esdo
= elf_section_data (output_section
);
2546 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2548 output_reldata
= &esdo
->rel
;
2549 swap_out
= bed
->s
->swap_reloc_out
;
2551 else if (esdo
->rela
.hdr
2552 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2554 output_reldata
= &esdo
->rela
;
2555 swap_out
= bed
->s
->swap_reloca_out
;
2560 /* xgettext:c-format */
2561 (_("%B: relocation size mismatch in %B section %A"),
2562 output_bfd
, input_section
->owner
, input_section
);
2563 bfd_set_error (bfd_error_wrong_format
);
2567 erel
= output_reldata
->hdr
->contents
;
2568 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2569 irela
= internal_relocs
;
2570 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2571 * bed
->s
->int_rels_per_ext_rel
);
2572 while (irela
< irelaend
)
2574 (*swap_out
) (output_bfd
, irela
, erel
);
2575 irela
+= bed
->s
->int_rels_per_ext_rel
;
2576 erel
+= input_rel_hdr
->sh_entsize
;
2579 /* Bump the counter, so that we know where to add the next set of
2581 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2586 /* Make weak undefined symbols in PIE dynamic. */
2589 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2590 struct elf_link_hash_entry
*h
)
2592 if (bfd_link_pie (info
)
2594 && h
->root
.type
== bfd_link_hash_undefweak
)
2595 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2600 /* Fix up the flags for a symbol. This handles various cases which
2601 can only be fixed after all the input files are seen. This is
2602 currently called by both adjust_dynamic_symbol and
2603 assign_sym_version, which is unnecessary but perhaps more robust in
2604 the face of future changes. */
2607 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2608 struct elf_info_failed
*eif
)
2610 const struct elf_backend_data
*bed
;
2612 /* If this symbol was mentioned in a non-ELF file, try to set
2613 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2614 permit a non-ELF file to correctly refer to a symbol defined in
2615 an ELF dynamic object. */
2618 while (h
->root
.type
== bfd_link_hash_indirect
)
2619 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2621 if (h
->root
.type
!= bfd_link_hash_defined
2622 && h
->root
.type
!= bfd_link_hash_defweak
)
2625 h
->ref_regular_nonweak
= 1;
2629 if (h
->root
.u
.def
.section
->owner
!= NULL
2630 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2631 == bfd_target_elf_flavour
))
2634 h
->ref_regular_nonweak
= 1;
2640 if (h
->dynindx
== -1
2644 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2653 /* Unfortunately, NON_ELF is only correct if the symbol
2654 was first seen in a non-ELF file. Fortunately, if the symbol
2655 was first seen in an ELF file, we're probably OK unless the
2656 symbol was defined in a non-ELF file. Catch that case here.
2657 FIXME: We're still in trouble if the symbol was first seen in
2658 a dynamic object, and then later in a non-ELF regular object. */
2659 if ((h
->root
.type
== bfd_link_hash_defined
2660 || h
->root
.type
== bfd_link_hash_defweak
)
2662 && (h
->root
.u
.def
.section
->owner
!= NULL
2663 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2664 != bfd_target_elf_flavour
)
2665 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2666 && !h
->def_dynamic
)))
2670 /* Backend specific symbol fixup. */
2671 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2672 if (bed
->elf_backend_fixup_symbol
2673 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2676 /* If this is a final link, and the symbol was defined as a common
2677 symbol in a regular object file, and there was no definition in
2678 any dynamic object, then the linker will have allocated space for
2679 the symbol in a common section but the DEF_REGULAR
2680 flag will not have been set. */
2681 if (h
->root
.type
== bfd_link_hash_defined
2685 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2688 /* If a weak undefined symbol has non-default visibility, we also
2689 hide it from the dynamic linker. */
2690 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2691 && h
->root
.type
== bfd_link_hash_undefweak
)
2692 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2694 /* A hidden versioned symbol in executable should be forced local if
2695 it is is locally defined, not referenced by shared library and not
2697 else if (bfd_link_executable (eif
->info
)
2698 && h
->versioned
== versioned_hidden
2699 && !eif
->info
->export_dynamic
2703 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2705 /* If -Bsymbolic was used (which means to bind references to global
2706 symbols to the definition within the shared object), and this
2707 symbol was defined in a regular object, then it actually doesn't
2708 need a PLT entry. Likewise, if the symbol has non-default
2709 visibility. If the symbol has hidden or internal visibility, we
2710 will force it local. */
2711 else if (h
->needs_plt
2712 && bfd_link_pic (eif
->info
)
2713 && is_elf_hash_table (eif
->info
->hash
)
2714 && (SYMBOLIC_BIND (eif
->info
, h
)
2715 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2718 bfd_boolean force_local
;
2720 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2721 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2722 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2725 /* If this is a weak defined symbol in a dynamic object, and we know
2726 the real definition in the dynamic object, copy interesting flags
2727 over to the real definition. */
2728 if (h
->u
.weakdef
!= NULL
)
2730 /* If the real definition is defined by a regular object file,
2731 don't do anything special. See the longer description in
2732 _bfd_elf_adjust_dynamic_symbol, below. */
2733 if (h
->u
.weakdef
->def_regular
)
2734 h
->u
.weakdef
= NULL
;
2737 struct elf_link_hash_entry
*weakdef
= h
->u
.weakdef
;
2739 while (h
->root
.type
== bfd_link_hash_indirect
)
2740 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2742 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2743 || h
->root
.type
== bfd_link_hash_defweak
);
2744 BFD_ASSERT (weakdef
->def_dynamic
);
2745 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2746 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2747 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2754 /* Make the backend pick a good value for a dynamic symbol. This is
2755 called via elf_link_hash_traverse, and also calls itself
2759 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2761 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2763 const struct elf_backend_data
*bed
;
2765 if (! is_elf_hash_table (eif
->info
->hash
))
2768 /* Ignore indirect symbols. These are added by the versioning code. */
2769 if (h
->root
.type
== bfd_link_hash_indirect
)
2772 /* Fix the symbol flags. */
2773 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2776 /* If this symbol does not require a PLT entry, and it is not
2777 defined by a dynamic object, or is not referenced by a regular
2778 object, ignore it. We do have to handle a weak defined symbol,
2779 even if no regular object refers to it, if we decided to add it
2780 to the dynamic symbol table. FIXME: Do we normally need to worry
2781 about symbols which are defined by one dynamic object and
2782 referenced by another one? */
2784 && h
->type
!= STT_GNU_IFUNC
2788 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2790 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2794 /* If we've already adjusted this symbol, don't do it again. This
2795 can happen via a recursive call. */
2796 if (h
->dynamic_adjusted
)
2799 /* Don't look at this symbol again. Note that we must set this
2800 after checking the above conditions, because we may look at a
2801 symbol once, decide not to do anything, and then get called
2802 recursively later after REF_REGULAR is set below. */
2803 h
->dynamic_adjusted
= 1;
2805 /* If this is a weak definition, and we know a real definition, and
2806 the real symbol is not itself defined by a regular object file,
2807 then get a good value for the real definition. We handle the
2808 real symbol first, for the convenience of the backend routine.
2810 Note that there is a confusing case here. If the real definition
2811 is defined by a regular object file, we don't get the real symbol
2812 from the dynamic object, but we do get the weak symbol. If the
2813 processor backend uses a COPY reloc, then if some routine in the
2814 dynamic object changes the real symbol, we will not see that
2815 change in the corresponding weak symbol. This is the way other
2816 ELF linkers work as well, and seems to be a result of the shared
2819 I will clarify this issue. Most SVR4 shared libraries define the
2820 variable _timezone and define timezone as a weak synonym. The
2821 tzset call changes _timezone. If you write
2822 extern int timezone;
2824 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2825 you might expect that, since timezone is a synonym for _timezone,
2826 the same number will print both times. However, if the processor
2827 backend uses a COPY reloc, then actually timezone will be copied
2828 into your process image, and, since you define _timezone
2829 yourself, _timezone will not. Thus timezone and _timezone will
2830 wind up at different memory locations. The tzset call will set
2831 _timezone, leaving timezone unchanged. */
2833 if (h
->u
.weakdef
!= NULL
)
2835 /* If we get to this point, there is an implicit reference to
2836 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2837 h
->u
.weakdef
->ref_regular
= 1;
2839 /* Ensure that the backend adjust_dynamic_symbol function sees
2840 H->U.WEAKDEF before H by recursively calling ourselves. */
2841 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2845 /* If a symbol has no type and no size and does not require a PLT
2846 entry, then we are probably about to do the wrong thing here: we
2847 are probably going to create a COPY reloc for an empty object.
2848 This case can arise when a shared object is built with assembly
2849 code, and the assembly code fails to set the symbol type. */
2851 && h
->type
== STT_NOTYPE
2854 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2855 h
->root
.root
.string
);
2857 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2858 bed
= get_elf_backend_data (dynobj
);
2860 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2869 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2873 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
2874 struct elf_link_hash_entry
*h
,
2877 unsigned int power_of_two
;
2879 asection
*sec
= h
->root
.u
.def
.section
;
2881 /* The section aligment of definition is the maximum alignment
2882 requirement of symbols defined in the section. Since we don't
2883 know the symbol alignment requirement, we start with the
2884 maximum alignment and check low bits of the symbol address
2885 for the minimum alignment. */
2886 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2887 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2888 while ((h
->root
.u
.def
.value
& mask
) != 0)
2894 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2897 /* Adjust the section alignment if needed. */
2898 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2903 /* We make sure that the symbol will be aligned properly. */
2904 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2906 /* Define the symbol as being at this point in DYNBSS. */
2907 h
->root
.u
.def
.section
= dynbss
;
2908 h
->root
.u
.def
.value
= dynbss
->size
;
2910 /* Increment the size of DYNBSS to make room for the symbol. */
2911 dynbss
->size
+= h
->size
;
2913 /* No error if extern_protected_data is true. */
2914 if (h
->protected_def
2915 && (!info
->extern_protected_data
2916 || (info
->extern_protected_data
< 0
2917 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
2918 info
->callbacks
->einfo
2919 (_("%P: copy reloc against protected `%T' is dangerous\n"),
2920 h
->root
.root
.string
);
2925 /* Adjust all external symbols pointing into SEC_MERGE sections
2926 to reflect the object merging within the sections. */
2929 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2933 if ((h
->root
.type
== bfd_link_hash_defined
2934 || h
->root
.type
== bfd_link_hash_defweak
)
2935 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2936 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
2938 bfd
*output_bfd
= (bfd
*) data
;
2940 h
->root
.u
.def
.value
=
2941 _bfd_merged_section_offset (output_bfd
,
2942 &h
->root
.u
.def
.section
,
2943 elf_section_data (sec
)->sec_info
,
2944 h
->root
.u
.def
.value
);
2950 /* Returns false if the symbol referred to by H should be considered
2951 to resolve local to the current module, and true if it should be
2952 considered to bind dynamically. */
2955 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2956 struct bfd_link_info
*info
,
2957 bfd_boolean not_local_protected
)
2959 bfd_boolean binding_stays_local_p
;
2960 const struct elf_backend_data
*bed
;
2961 struct elf_link_hash_table
*hash_table
;
2966 while (h
->root
.type
== bfd_link_hash_indirect
2967 || h
->root
.type
== bfd_link_hash_warning
)
2968 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2970 /* If it was forced local, then clearly it's not dynamic. */
2971 if (h
->dynindx
== -1)
2973 if (h
->forced_local
)
2976 /* Identify the cases where name binding rules say that a
2977 visible symbol resolves locally. */
2978 binding_stays_local_p
= (bfd_link_executable (info
)
2979 || SYMBOLIC_BIND (info
, h
));
2981 switch (ELF_ST_VISIBILITY (h
->other
))
2988 hash_table
= elf_hash_table (info
);
2989 if (!is_elf_hash_table (hash_table
))
2992 bed
= get_elf_backend_data (hash_table
->dynobj
);
2994 /* Proper resolution for function pointer equality may require
2995 that these symbols perhaps be resolved dynamically, even though
2996 we should be resolving them to the current module. */
2997 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
2998 binding_stays_local_p
= TRUE
;
3005 /* If it isn't defined locally, then clearly it's dynamic. */
3006 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3009 /* Otherwise, the symbol is dynamic if binding rules don't tell
3010 us that it remains local. */
3011 return !binding_stays_local_p
;
3014 /* Return true if the symbol referred to by H should be considered
3015 to resolve local to the current module, and false otherwise. Differs
3016 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3017 undefined symbols. The two functions are virtually identical except
3018 for the place where forced_local and dynindx == -1 are tested. If
3019 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
3020 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
3021 the symbol is local only for defined symbols.
3022 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3023 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3024 treatment of undefined weak symbols. For those that do not make
3025 undefined weak symbols dynamic, both functions may return false. */
3028 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3029 struct bfd_link_info
*info
,
3030 bfd_boolean local_protected
)
3032 const struct elf_backend_data
*bed
;
3033 struct elf_link_hash_table
*hash_table
;
3035 /* If it's a local sym, of course we resolve locally. */
3039 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3040 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3041 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3044 /* Common symbols that become definitions don't get the DEF_REGULAR
3045 flag set, so test it first, and don't bail out. */
3046 if (ELF_COMMON_DEF_P (h
))
3048 /* If we don't have a definition in a regular file, then we can't
3049 resolve locally. The sym is either undefined or dynamic. */
3050 else if (!h
->def_regular
)
3053 /* Forced local symbols resolve locally. */
3054 if (h
->forced_local
)
3057 /* As do non-dynamic symbols. */
3058 if (h
->dynindx
== -1)
3061 /* At this point, we know the symbol is defined and dynamic. In an
3062 executable it must resolve locally, likewise when building symbolic
3063 shared libraries. */
3064 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3067 /* Now deal with defined dynamic symbols in shared libraries. Ones
3068 with default visibility might not resolve locally. */
3069 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3072 hash_table
= elf_hash_table (info
);
3073 if (!is_elf_hash_table (hash_table
))
3076 bed
= get_elf_backend_data (hash_table
->dynobj
);
3078 /* If extern_protected_data is false, STV_PROTECTED non-function
3079 symbols are local. */
3080 if ((!info
->extern_protected_data
3081 || (info
->extern_protected_data
< 0
3082 && !bed
->extern_protected_data
))
3083 && !bed
->is_function_type (h
->type
))
3086 /* Function pointer equality tests may require that STV_PROTECTED
3087 symbols be treated as dynamic symbols. If the address of a
3088 function not defined in an executable is set to that function's
3089 plt entry in the executable, then the address of the function in
3090 a shared library must also be the plt entry in the executable. */
3091 return local_protected
;
3094 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3095 aligned. Returns the first TLS output section. */
3097 struct bfd_section
*
3098 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3100 struct bfd_section
*sec
, *tls
;
3101 unsigned int align
= 0;
3103 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3104 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3108 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3109 if (sec
->alignment_power
> align
)
3110 align
= sec
->alignment_power
;
3112 elf_hash_table (info
)->tls_sec
= tls
;
3114 /* Ensure the alignment of the first section is the largest alignment,
3115 so that the tls segment starts aligned. */
3117 tls
->alignment_power
= align
;
3122 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3124 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3125 Elf_Internal_Sym
*sym
)
3127 const struct elf_backend_data
*bed
;
3129 /* Local symbols do not count, but target specific ones might. */
3130 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3131 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3134 bed
= get_elf_backend_data (abfd
);
3135 /* Function symbols do not count. */
3136 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3139 /* If the section is undefined, then so is the symbol. */
3140 if (sym
->st_shndx
== SHN_UNDEF
)
3143 /* If the symbol is defined in the common section, then
3144 it is a common definition and so does not count. */
3145 if (bed
->common_definition (sym
))
3148 /* If the symbol is in a target specific section then we
3149 must rely upon the backend to tell us what it is. */
3150 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3151 /* FIXME - this function is not coded yet:
3153 return _bfd_is_global_symbol_definition (abfd, sym);
3155 Instead for now assume that the definition is not global,
3156 Even if this is wrong, at least the linker will behave
3157 in the same way that it used to do. */
3163 /* Search the symbol table of the archive element of the archive ABFD
3164 whose archive map contains a mention of SYMDEF, and determine if
3165 the symbol is defined in this element. */
3167 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3169 Elf_Internal_Shdr
* hdr
;
3173 Elf_Internal_Sym
*isymbuf
;
3174 Elf_Internal_Sym
*isym
;
3175 Elf_Internal_Sym
*isymend
;
3178 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3182 if (! bfd_check_format (abfd
, bfd_object
))
3185 /* Select the appropriate symbol table. If we don't know if the
3186 object file is an IR object, give linker LTO plugin a chance to
3187 get the correct symbol table. */
3188 if (abfd
->plugin_format
== bfd_plugin_yes
3189 #if BFD_SUPPORTS_PLUGINS
3190 || (abfd
->plugin_format
== bfd_plugin_unknown
3191 && bfd_link_plugin_object_p (abfd
))
3195 /* Use the IR symbol table if the object has been claimed by
3197 abfd
= abfd
->plugin_dummy_bfd
;
3198 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3200 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3201 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3203 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3205 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3207 /* The sh_info field of the symtab header tells us where the
3208 external symbols start. We don't care about the local symbols. */
3209 if (elf_bad_symtab (abfd
))
3211 extsymcount
= symcount
;
3216 extsymcount
= symcount
- hdr
->sh_info
;
3217 extsymoff
= hdr
->sh_info
;
3220 if (extsymcount
== 0)
3223 /* Read in the symbol table. */
3224 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3226 if (isymbuf
== NULL
)
3229 /* Scan the symbol table looking for SYMDEF. */
3231 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3235 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3240 if (strcmp (name
, symdef
->name
) == 0)
3242 result
= is_global_data_symbol_definition (abfd
, isym
);
3252 /* Add an entry to the .dynamic table. */
3255 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3259 struct elf_link_hash_table
*hash_table
;
3260 const struct elf_backend_data
*bed
;
3262 bfd_size_type newsize
;
3263 bfd_byte
*newcontents
;
3264 Elf_Internal_Dyn dyn
;
3266 hash_table
= elf_hash_table (info
);
3267 if (! is_elf_hash_table (hash_table
))
3270 bed
= get_elf_backend_data (hash_table
->dynobj
);
3271 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3272 BFD_ASSERT (s
!= NULL
);
3274 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3275 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3276 if (newcontents
== NULL
)
3280 dyn
.d_un
.d_val
= val
;
3281 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3284 s
->contents
= newcontents
;
3289 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3290 otherwise just check whether one already exists. Returns -1 on error,
3291 1 if a DT_NEEDED tag already exists, and 0 on success. */
3294 elf_add_dt_needed_tag (bfd
*abfd
,
3295 struct bfd_link_info
*info
,
3299 struct elf_link_hash_table
*hash_table
;
3302 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3305 hash_table
= elf_hash_table (info
);
3306 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3307 if (strindex
== (size_t) -1)
3310 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3313 const struct elf_backend_data
*bed
;
3316 bed
= get_elf_backend_data (hash_table
->dynobj
);
3317 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3319 for (extdyn
= sdyn
->contents
;
3320 extdyn
< sdyn
->contents
+ sdyn
->size
;
3321 extdyn
+= bed
->s
->sizeof_dyn
)
3323 Elf_Internal_Dyn dyn
;
3325 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3326 if (dyn
.d_tag
== DT_NEEDED
3327 && dyn
.d_un
.d_val
== strindex
)
3329 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3337 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3340 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3344 /* We were just checking for existence of the tag. */
3345 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3350 /* Return true if SONAME is on the needed list between NEEDED and STOP
3351 (or the end of list if STOP is NULL), and needed by a library that
3355 on_needed_list (const char *soname
,
3356 struct bfd_link_needed_list
*needed
,
3357 struct bfd_link_needed_list
*stop
)
3359 struct bfd_link_needed_list
*look
;
3360 for (look
= needed
; look
!= stop
; look
= look
->next
)
3361 if (strcmp (soname
, look
->name
) == 0
3362 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3363 /* If needed by a library that itself is not directly
3364 needed, recursively check whether that library is
3365 indirectly needed. Since we add DT_NEEDED entries to
3366 the end of the list, library dependencies appear after
3367 the library. Therefore search prior to the current
3368 LOOK, preventing possible infinite recursion. */
3369 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3375 /* Sort symbol by value, section, and size. */
3377 elf_sort_symbol (const void *arg1
, const void *arg2
)
3379 const struct elf_link_hash_entry
*h1
;
3380 const struct elf_link_hash_entry
*h2
;
3381 bfd_signed_vma vdiff
;
3383 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3384 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3385 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3387 return vdiff
> 0 ? 1 : -1;
3390 int sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3392 return sdiff
> 0 ? 1 : -1;
3394 vdiff
= h1
->size
- h2
->size
;
3395 return vdiff
== 0 ? 0 : vdiff
> 0 ? 1 : -1;
3398 /* This function is used to adjust offsets into .dynstr for
3399 dynamic symbols. This is called via elf_link_hash_traverse. */
3402 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3404 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3406 if (h
->dynindx
!= -1)
3407 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3411 /* Assign string offsets in .dynstr, update all structures referencing
3415 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3417 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3418 struct elf_link_local_dynamic_entry
*entry
;
3419 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3420 bfd
*dynobj
= hash_table
->dynobj
;
3423 const struct elf_backend_data
*bed
;
3426 _bfd_elf_strtab_finalize (dynstr
);
3427 size
= _bfd_elf_strtab_size (dynstr
);
3429 bed
= get_elf_backend_data (dynobj
);
3430 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3431 BFD_ASSERT (sdyn
!= NULL
);
3433 /* Update all .dynamic entries referencing .dynstr strings. */
3434 for (extdyn
= sdyn
->contents
;
3435 extdyn
< sdyn
->contents
+ sdyn
->size
;
3436 extdyn
+= bed
->s
->sizeof_dyn
)
3438 Elf_Internal_Dyn dyn
;
3440 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3444 dyn
.d_un
.d_val
= size
;
3454 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3459 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3462 /* Now update local dynamic symbols. */
3463 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3464 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3465 entry
->isym
.st_name
);
3467 /* And the rest of dynamic symbols. */
3468 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3470 /* Adjust version definitions. */
3471 if (elf_tdata (output_bfd
)->cverdefs
)
3476 Elf_Internal_Verdef def
;
3477 Elf_Internal_Verdaux defaux
;
3479 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3483 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3485 p
+= sizeof (Elf_External_Verdef
);
3486 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3488 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3490 _bfd_elf_swap_verdaux_in (output_bfd
,
3491 (Elf_External_Verdaux
*) p
, &defaux
);
3492 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3494 _bfd_elf_swap_verdaux_out (output_bfd
,
3495 &defaux
, (Elf_External_Verdaux
*) p
);
3496 p
+= sizeof (Elf_External_Verdaux
);
3499 while (def
.vd_next
);
3502 /* Adjust version references. */
3503 if (elf_tdata (output_bfd
)->verref
)
3508 Elf_Internal_Verneed need
;
3509 Elf_Internal_Vernaux needaux
;
3511 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3515 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3517 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3518 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3519 (Elf_External_Verneed
*) p
);
3520 p
+= sizeof (Elf_External_Verneed
);
3521 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3523 _bfd_elf_swap_vernaux_in (output_bfd
,
3524 (Elf_External_Vernaux
*) p
, &needaux
);
3525 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3527 _bfd_elf_swap_vernaux_out (output_bfd
,
3529 (Elf_External_Vernaux
*) p
);
3530 p
+= sizeof (Elf_External_Vernaux
);
3533 while (need
.vn_next
);
3539 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3540 The default is to only match when the INPUT and OUTPUT are exactly
3544 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3545 const bfd_target
*output
)
3547 return input
== output
;
3550 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3551 This version is used when different targets for the same architecture
3552 are virtually identical. */
3555 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3556 const bfd_target
*output
)
3558 const struct elf_backend_data
*obed
, *ibed
;
3560 if (input
== output
)
3563 ibed
= xvec_get_elf_backend_data (input
);
3564 obed
= xvec_get_elf_backend_data (output
);
3566 if (ibed
->arch
!= obed
->arch
)
3569 /* If both backends are using this function, deem them compatible. */
3570 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3573 /* Make a special call to the linker "notice" function to tell it that
3574 we are about to handle an as-needed lib, or have finished
3575 processing the lib. */
3578 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3579 struct bfd_link_info
*info
,
3580 enum notice_asneeded_action act
)
3582 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3585 /* Check relocations an ELF object file. */
3588 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3590 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3591 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3593 /* If this object is the same format as the output object, and it is
3594 not a shared library, then let the backend look through the
3597 This is required to build global offset table entries and to
3598 arrange for dynamic relocs. It is not required for the
3599 particular common case of linking non PIC code, even when linking
3600 against shared libraries, but unfortunately there is no way of
3601 knowing whether an object file has been compiled PIC or not.
3602 Looking through the relocs is not particularly time consuming.
3603 The problem is that we must either (1) keep the relocs in memory,
3604 which causes the linker to require additional runtime memory or
3605 (2) read the relocs twice from the input file, which wastes time.
3606 This would be a good case for using mmap.
3608 I have no idea how to handle linking PIC code into a file of a
3609 different format. It probably can't be done. */
3610 if ((abfd
->flags
& DYNAMIC
) == 0
3611 && is_elf_hash_table (htab
)
3612 && bed
->check_relocs
!= NULL
3613 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
3614 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
3618 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3620 Elf_Internal_Rela
*internal_relocs
;
3623 /* Don't check relocations in excluded sections. */
3624 if ((o
->flags
& SEC_RELOC
) == 0
3625 || (o
->flags
& SEC_EXCLUDE
) != 0
3626 || o
->reloc_count
== 0
3627 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
3628 && (o
->flags
& SEC_DEBUGGING
) != 0)
3629 || bfd_is_abs_section (o
->output_section
))
3632 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
3634 if (internal_relocs
== NULL
)
3637 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
3639 if (elf_section_data (o
)->relocs
!= internal_relocs
)
3640 free (internal_relocs
);
3650 /* Add symbols from an ELF object file to the linker hash table. */
3653 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3655 Elf_Internal_Ehdr
*ehdr
;
3656 Elf_Internal_Shdr
*hdr
;
3660 struct elf_link_hash_entry
**sym_hash
;
3661 bfd_boolean dynamic
;
3662 Elf_External_Versym
*extversym
= NULL
;
3663 Elf_External_Versym
*ever
;
3664 struct elf_link_hash_entry
*weaks
;
3665 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3666 size_t nondeflt_vers_cnt
= 0;
3667 Elf_Internal_Sym
*isymbuf
= NULL
;
3668 Elf_Internal_Sym
*isym
;
3669 Elf_Internal_Sym
*isymend
;
3670 const struct elf_backend_data
*bed
;
3671 bfd_boolean add_needed
;
3672 struct elf_link_hash_table
*htab
;
3674 void *alloc_mark
= NULL
;
3675 struct bfd_hash_entry
**old_table
= NULL
;
3676 unsigned int old_size
= 0;
3677 unsigned int old_count
= 0;
3678 void *old_tab
= NULL
;
3680 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3681 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3682 void *old_strtab
= NULL
;
3685 bfd_boolean just_syms
;
3687 htab
= elf_hash_table (info
);
3688 bed
= get_elf_backend_data (abfd
);
3690 if ((abfd
->flags
& DYNAMIC
) == 0)
3696 /* You can't use -r against a dynamic object. Also, there's no
3697 hope of using a dynamic object which does not exactly match
3698 the format of the output file. */
3699 if (bfd_link_relocatable (info
)
3700 || !is_elf_hash_table (htab
)
3701 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3703 if (bfd_link_relocatable (info
))
3704 bfd_set_error (bfd_error_invalid_operation
);
3706 bfd_set_error (bfd_error_wrong_format
);
3711 ehdr
= elf_elfheader (abfd
);
3712 if (info
->warn_alternate_em
3713 && bed
->elf_machine_code
!= ehdr
->e_machine
3714 && ((bed
->elf_machine_alt1
!= 0
3715 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3716 || (bed
->elf_machine_alt2
!= 0
3717 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3718 info
->callbacks
->einfo
3719 /* xgettext:c-format */
3720 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3721 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3723 /* As a GNU extension, any input sections which are named
3724 .gnu.warning.SYMBOL are treated as warning symbols for the given
3725 symbol. This differs from .gnu.warning sections, which generate
3726 warnings when they are included in an output file. */
3727 /* PR 12761: Also generate this warning when building shared libraries. */
3728 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3732 name
= bfd_get_section_name (abfd
, s
);
3733 if (CONST_STRNEQ (name
, ".gnu.warning."))
3738 name
+= sizeof ".gnu.warning." - 1;
3740 /* If this is a shared object, then look up the symbol
3741 in the hash table. If it is there, and it is already
3742 been defined, then we will not be using the entry
3743 from this shared object, so we don't need to warn.
3744 FIXME: If we see the definition in a regular object
3745 later on, we will warn, but we shouldn't. The only
3746 fix is to keep track of what warnings we are supposed
3747 to emit, and then handle them all at the end of the
3751 struct elf_link_hash_entry
*h
;
3753 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3755 /* FIXME: What about bfd_link_hash_common? */
3757 && (h
->root
.type
== bfd_link_hash_defined
3758 || h
->root
.type
== bfd_link_hash_defweak
))
3763 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
3767 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3772 if (! (_bfd_generic_link_add_one_symbol
3773 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3774 FALSE
, bed
->collect
, NULL
)))
3777 if (bfd_link_executable (info
))
3779 /* Clobber the section size so that the warning does
3780 not get copied into the output file. */
3783 /* Also set SEC_EXCLUDE, so that symbols defined in
3784 the warning section don't get copied to the output. */
3785 s
->flags
|= SEC_EXCLUDE
;
3790 just_syms
= ((s
= abfd
->sections
) != NULL
3791 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
3796 /* If we are creating a shared library, create all the dynamic
3797 sections immediately. We need to attach them to something,
3798 so we attach them to this BFD, provided it is the right
3799 format and is not from ld --just-symbols. Always create the
3800 dynamic sections for -E/--dynamic-list. FIXME: If there
3801 are no input BFD's of the same format as the output, we can't
3802 make a shared library. */
3804 && (bfd_link_pic (info
)
3805 || (!bfd_link_relocatable (info
)
3806 && (info
->export_dynamic
|| info
->dynamic
)))
3807 && is_elf_hash_table (htab
)
3808 && info
->output_bfd
->xvec
== abfd
->xvec
3809 && !htab
->dynamic_sections_created
)
3811 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3815 else if (!is_elf_hash_table (htab
))
3819 const char *soname
= NULL
;
3821 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3822 const Elf_Internal_Phdr
*phdr
;
3825 /* ld --just-symbols and dynamic objects don't mix very well.
3826 ld shouldn't allow it. */
3830 /* If this dynamic lib was specified on the command line with
3831 --as-needed in effect, then we don't want to add a DT_NEEDED
3832 tag unless the lib is actually used. Similary for libs brought
3833 in by another lib's DT_NEEDED. When --no-add-needed is used
3834 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3835 any dynamic library in DT_NEEDED tags in the dynamic lib at
3837 add_needed
= (elf_dyn_lib_class (abfd
)
3838 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3839 | DYN_NO_NEEDED
)) == 0;
3841 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3846 unsigned int elfsec
;
3847 unsigned long shlink
;
3849 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3856 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3857 if (elfsec
== SHN_BAD
)
3858 goto error_free_dyn
;
3859 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3861 for (extdyn
= dynbuf
;
3862 extdyn
< dynbuf
+ s
->size
;
3863 extdyn
+= bed
->s
->sizeof_dyn
)
3865 Elf_Internal_Dyn dyn
;
3867 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3868 if (dyn
.d_tag
== DT_SONAME
)
3870 unsigned int tagv
= dyn
.d_un
.d_val
;
3871 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3873 goto error_free_dyn
;
3875 if (dyn
.d_tag
== DT_NEEDED
)
3877 struct bfd_link_needed_list
*n
, **pn
;
3879 unsigned int tagv
= dyn
.d_un
.d_val
;
3881 amt
= sizeof (struct bfd_link_needed_list
);
3882 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3883 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3884 if (n
== NULL
|| fnm
== NULL
)
3885 goto error_free_dyn
;
3886 amt
= strlen (fnm
) + 1;
3887 anm
= (char *) bfd_alloc (abfd
, amt
);
3889 goto error_free_dyn
;
3890 memcpy (anm
, fnm
, amt
);
3894 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3898 if (dyn
.d_tag
== DT_RUNPATH
)
3900 struct bfd_link_needed_list
*n
, **pn
;
3902 unsigned int tagv
= dyn
.d_un
.d_val
;
3904 amt
= sizeof (struct bfd_link_needed_list
);
3905 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3906 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3907 if (n
== NULL
|| fnm
== NULL
)
3908 goto error_free_dyn
;
3909 amt
= strlen (fnm
) + 1;
3910 anm
= (char *) bfd_alloc (abfd
, amt
);
3912 goto error_free_dyn
;
3913 memcpy (anm
, fnm
, amt
);
3917 for (pn
= & runpath
;
3923 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3924 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3926 struct bfd_link_needed_list
*n
, **pn
;
3928 unsigned int tagv
= dyn
.d_un
.d_val
;
3930 amt
= sizeof (struct bfd_link_needed_list
);
3931 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3932 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3933 if (n
== NULL
|| fnm
== NULL
)
3934 goto error_free_dyn
;
3935 amt
= strlen (fnm
) + 1;
3936 anm
= (char *) bfd_alloc (abfd
, amt
);
3938 goto error_free_dyn
;
3939 memcpy (anm
, fnm
, amt
);
3949 if (dyn
.d_tag
== DT_AUDIT
)
3951 unsigned int tagv
= dyn
.d_un
.d_val
;
3952 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3959 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3960 frees all more recently bfd_alloc'd blocks as well. */
3966 struct bfd_link_needed_list
**pn
;
3967 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3972 /* If we have a PT_GNU_RELRO program header, mark as read-only
3973 all sections contained fully therein. This makes relro
3974 shared library sections appear as they will at run-time. */
3975 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
3976 while (--phdr
>= elf_tdata (abfd
)->phdr
)
3977 if (phdr
->p_type
== PT_GNU_RELRO
)
3979 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3980 if ((s
->flags
& SEC_ALLOC
) != 0
3981 && s
->vma
>= phdr
->p_vaddr
3982 && s
->vma
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
3983 s
->flags
|= SEC_READONLY
;
3987 /* We do not want to include any of the sections in a dynamic
3988 object in the output file. We hack by simply clobbering the
3989 list of sections in the BFD. This could be handled more
3990 cleanly by, say, a new section flag; the existing
3991 SEC_NEVER_LOAD flag is not the one we want, because that one
3992 still implies that the section takes up space in the output
3994 bfd_section_list_clear (abfd
);
3996 /* Find the name to use in a DT_NEEDED entry that refers to this
3997 object. If the object has a DT_SONAME entry, we use it.
3998 Otherwise, if the generic linker stuck something in
3999 elf_dt_name, we use that. Otherwise, we just use the file
4001 if (soname
== NULL
|| *soname
== '\0')
4003 soname
= elf_dt_name (abfd
);
4004 if (soname
== NULL
|| *soname
== '\0')
4005 soname
= bfd_get_filename (abfd
);
4008 /* Save the SONAME because sometimes the linker emulation code
4009 will need to know it. */
4010 elf_dt_name (abfd
) = soname
;
4012 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4016 /* If we have already included this dynamic object in the
4017 link, just ignore it. There is no reason to include a
4018 particular dynamic object more than once. */
4022 /* Save the DT_AUDIT entry for the linker emulation code. */
4023 elf_dt_audit (abfd
) = audit
;
4026 /* If this is a dynamic object, we always link against the .dynsym
4027 symbol table, not the .symtab symbol table. The dynamic linker
4028 will only see the .dynsym symbol table, so there is no reason to
4029 look at .symtab for a dynamic object. */
4031 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4032 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4034 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4036 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4038 /* The sh_info field of the symtab header tells us where the
4039 external symbols start. We don't care about the local symbols at
4041 if (elf_bad_symtab (abfd
))
4043 extsymcount
= symcount
;
4048 extsymcount
= symcount
- hdr
->sh_info
;
4049 extsymoff
= hdr
->sh_info
;
4052 sym_hash
= elf_sym_hashes (abfd
);
4053 if (extsymcount
!= 0)
4055 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4057 if (isymbuf
== NULL
)
4060 if (sym_hash
== NULL
)
4062 /* We store a pointer to the hash table entry for each
4065 amt
*= sizeof (struct elf_link_hash_entry
*);
4066 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4067 if (sym_hash
== NULL
)
4068 goto error_free_sym
;
4069 elf_sym_hashes (abfd
) = sym_hash
;
4075 /* Read in any version definitions. */
4076 if (!_bfd_elf_slurp_version_tables (abfd
,
4077 info
->default_imported_symver
))
4078 goto error_free_sym
;
4080 /* Read in the symbol versions, but don't bother to convert them
4081 to internal format. */
4082 if (elf_dynversym (abfd
) != 0)
4084 Elf_Internal_Shdr
*versymhdr
;
4086 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4087 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
4088 if (extversym
== NULL
)
4089 goto error_free_sym
;
4090 amt
= versymhdr
->sh_size
;
4091 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
4092 || bfd_bread (extversym
, amt
, abfd
) != amt
)
4093 goto error_free_vers
;
4097 /* If we are loading an as-needed shared lib, save the symbol table
4098 state before we start adding symbols. If the lib turns out
4099 to be unneeded, restore the state. */
4100 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4105 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4107 struct bfd_hash_entry
*p
;
4108 struct elf_link_hash_entry
*h
;
4110 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4112 h
= (struct elf_link_hash_entry
*) p
;
4113 entsize
+= htab
->root
.table
.entsize
;
4114 if (h
->root
.type
== bfd_link_hash_warning
)
4115 entsize
+= htab
->root
.table
.entsize
;
4119 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4120 old_tab
= bfd_malloc (tabsize
+ entsize
);
4121 if (old_tab
== NULL
)
4122 goto error_free_vers
;
4124 /* Remember the current objalloc pointer, so that all mem for
4125 symbols added can later be reclaimed. */
4126 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4127 if (alloc_mark
== NULL
)
4128 goto error_free_vers
;
4130 /* Make a special call to the linker "notice" function to
4131 tell it that we are about to handle an as-needed lib. */
4132 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4133 goto error_free_vers
;
4135 /* Clone the symbol table. Remember some pointers into the
4136 symbol table, and dynamic symbol count. */
4137 old_ent
= (char *) old_tab
+ tabsize
;
4138 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4139 old_undefs
= htab
->root
.undefs
;
4140 old_undefs_tail
= htab
->root
.undefs_tail
;
4141 old_table
= htab
->root
.table
.table
;
4142 old_size
= htab
->root
.table
.size
;
4143 old_count
= htab
->root
.table
.count
;
4144 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4145 if (old_strtab
== NULL
)
4146 goto error_free_vers
;
4148 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4150 struct bfd_hash_entry
*p
;
4151 struct elf_link_hash_entry
*h
;
4153 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4155 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
4156 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4157 h
= (struct elf_link_hash_entry
*) p
;
4158 if (h
->root
.type
== bfd_link_hash_warning
)
4160 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
4161 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4168 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
4169 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4171 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4175 asection
*sec
, *new_sec
;
4178 struct elf_link_hash_entry
*h
;
4179 struct elf_link_hash_entry
*hi
;
4180 bfd_boolean definition
;
4181 bfd_boolean size_change_ok
;
4182 bfd_boolean type_change_ok
;
4183 bfd_boolean new_weakdef
;
4184 bfd_boolean new_weak
;
4185 bfd_boolean old_weak
;
4186 bfd_boolean override
;
4188 bfd_boolean discarded
;
4189 unsigned int old_alignment
;
4191 bfd_boolean matched
;
4195 flags
= BSF_NO_FLAGS
;
4197 value
= isym
->st_value
;
4198 common
= bed
->common_definition (isym
);
4201 bind
= ELF_ST_BIND (isym
->st_info
);
4205 /* This should be impossible, since ELF requires that all
4206 global symbols follow all local symbols, and that sh_info
4207 point to the first global symbol. Unfortunately, Irix 5
4212 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4220 case STB_GNU_UNIQUE
:
4221 flags
= BSF_GNU_UNIQUE
;
4225 /* Leave it up to the processor backend. */
4229 if (isym
->st_shndx
== SHN_UNDEF
)
4230 sec
= bfd_und_section_ptr
;
4231 else if (isym
->st_shndx
== SHN_ABS
)
4232 sec
= bfd_abs_section_ptr
;
4233 else if (isym
->st_shndx
== SHN_COMMON
)
4235 sec
= bfd_com_section_ptr
;
4236 /* What ELF calls the size we call the value. What ELF
4237 calls the value we call the alignment. */
4238 value
= isym
->st_size
;
4242 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4244 sec
= bfd_abs_section_ptr
;
4245 else if (discarded_section (sec
))
4247 /* Symbols from discarded section are undefined. We keep
4249 sec
= bfd_und_section_ptr
;
4251 isym
->st_shndx
= SHN_UNDEF
;
4253 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4257 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4260 goto error_free_vers
;
4262 if (isym
->st_shndx
== SHN_COMMON
4263 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4265 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4269 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4271 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4273 goto error_free_vers
;
4277 else if (isym
->st_shndx
== SHN_COMMON
4278 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4279 && !bfd_link_relocatable (info
))
4281 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4285 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4286 | SEC_LINKER_CREATED
);
4287 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4289 goto error_free_vers
;
4293 else if (bed
->elf_add_symbol_hook
)
4295 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4297 goto error_free_vers
;
4299 /* The hook function sets the name to NULL if this symbol
4300 should be skipped for some reason. */
4305 /* Sanity check that all possibilities were handled. */
4308 bfd_set_error (bfd_error_bad_value
);
4309 goto error_free_vers
;
4312 /* Silently discard TLS symbols from --just-syms. There's
4313 no way to combine a static TLS block with a new TLS block
4314 for this executable. */
4315 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4316 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4319 if (bfd_is_und_section (sec
)
4320 || bfd_is_com_section (sec
))
4325 size_change_ok
= FALSE
;
4326 type_change_ok
= bed
->type_change_ok
;
4333 if (is_elf_hash_table (htab
))
4335 Elf_Internal_Versym iver
;
4336 unsigned int vernum
= 0;
4341 if (info
->default_imported_symver
)
4342 /* Use the default symbol version created earlier. */
4343 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4348 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4350 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4352 /* If this is a hidden symbol, or if it is not version
4353 1, we append the version name to the symbol name.
4354 However, we do not modify a non-hidden absolute symbol
4355 if it is not a function, because it might be the version
4356 symbol itself. FIXME: What if it isn't? */
4357 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4359 && (!bfd_is_abs_section (sec
)
4360 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4363 size_t namelen
, verlen
, newlen
;
4366 if (isym
->st_shndx
!= SHN_UNDEF
)
4368 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4370 else if (vernum
> 1)
4372 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4379 /* xgettext:c-format */
4380 (_("%B: %s: invalid version %u (max %d)"),
4382 elf_tdata (abfd
)->cverdefs
);
4383 bfd_set_error (bfd_error_bad_value
);
4384 goto error_free_vers
;
4389 /* We cannot simply test for the number of
4390 entries in the VERNEED section since the
4391 numbers for the needed versions do not start
4393 Elf_Internal_Verneed
*t
;
4396 for (t
= elf_tdata (abfd
)->verref
;
4400 Elf_Internal_Vernaux
*a
;
4402 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4404 if (a
->vna_other
== vernum
)
4406 verstr
= a
->vna_nodename
;
4416 /* xgettext:c-format */
4417 (_("%B: %s: invalid needed version %d"),
4418 abfd
, name
, vernum
);
4419 bfd_set_error (bfd_error_bad_value
);
4420 goto error_free_vers
;
4424 namelen
= strlen (name
);
4425 verlen
= strlen (verstr
);
4426 newlen
= namelen
+ verlen
+ 2;
4427 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4428 && isym
->st_shndx
!= SHN_UNDEF
)
4431 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4432 if (newname
== NULL
)
4433 goto error_free_vers
;
4434 memcpy (newname
, name
, namelen
);
4435 p
= newname
+ namelen
;
4437 /* If this is a defined non-hidden version symbol,
4438 we add another @ to the name. This indicates the
4439 default version of the symbol. */
4440 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4441 && isym
->st_shndx
!= SHN_UNDEF
)
4443 memcpy (p
, verstr
, verlen
+ 1);
4448 /* If this symbol has default visibility and the user has
4449 requested we not re-export it, then mark it as hidden. */
4450 if (!bfd_is_und_section (sec
)
4453 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4454 isym
->st_other
= (STV_HIDDEN
4455 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4457 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4458 sym_hash
, &old_bfd
, &old_weak
,
4459 &old_alignment
, &skip
, &override
,
4460 &type_change_ok
, &size_change_ok
,
4462 goto error_free_vers
;
4467 /* Override a definition only if the new symbol matches the
4469 if (override
&& matched
)
4473 while (h
->root
.type
== bfd_link_hash_indirect
4474 || h
->root
.type
== bfd_link_hash_warning
)
4475 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4477 if (elf_tdata (abfd
)->verdef
!= NULL
4480 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4483 if (! (_bfd_generic_link_add_one_symbol
4484 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4485 (struct bfd_link_hash_entry
**) sym_hash
)))
4486 goto error_free_vers
;
4488 if ((flags
& BSF_GNU_UNIQUE
)
4489 && (abfd
->flags
& DYNAMIC
) == 0
4490 && bfd_get_flavour (info
->output_bfd
) == bfd_target_elf_flavour
)
4491 elf_tdata (info
->output_bfd
)->has_gnu_symbols
|= elf_gnu_symbol_unique
;
4494 /* We need to make sure that indirect symbol dynamic flags are
4497 while (h
->root
.type
== bfd_link_hash_indirect
4498 || h
->root
.type
== bfd_link_hash_warning
)
4499 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4501 /* Setting the index to -3 tells elf_link_output_extsym that
4502 this symbol is defined in a discarded section. */
4508 new_weak
= (flags
& BSF_WEAK
) != 0;
4509 new_weakdef
= FALSE
;
4513 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4514 && is_elf_hash_table (htab
)
4515 && h
->u
.weakdef
== NULL
)
4517 /* Keep a list of all weak defined non function symbols from
4518 a dynamic object, using the weakdef field. Later in this
4519 function we will set the weakdef field to the correct
4520 value. We only put non-function symbols from dynamic
4521 objects on this list, because that happens to be the only
4522 time we need to know the normal symbol corresponding to a
4523 weak symbol, and the information is time consuming to
4524 figure out. If the weakdef field is not already NULL,
4525 then this symbol was already defined by some previous
4526 dynamic object, and we will be using that previous
4527 definition anyhow. */
4529 h
->u
.weakdef
= weaks
;
4534 /* Set the alignment of a common symbol. */
4535 if ((common
|| bfd_is_com_section (sec
))
4536 && h
->root
.type
== bfd_link_hash_common
)
4541 align
= bfd_log2 (isym
->st_value
);
4544 /* The new symbol is a common symbol in a shared object.
4545 We need to get the alignment from the section. */
4546 align
= new_sec
->alignment_power
;
4548 if (align
> old_alignment
)
4549 h
->root
.u
.c
.p
->alignment_power
= align
;
4551 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4554 if (is_elf_hash_table (htab
))
4556 /* Set a flag in the hash table entry indicating the type of
4557 reference or definition we just found. A dynamic symbol
4558 is one which is referenced or defined by both a regular
4559 object and a shared object. */
4560 bfd_boolean dynsym
= FALSE
;
4562 /* Plugin symbols aren't normal. Don't set def_regular or
4563 ref_regular for them, or make them dynamic. */
4564 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4571 if (bind
!= STB_WEAK
)
4572 h
->ref_regular_nonweak
= 1;
4584 /* If the indirect symbol has been forced local, don't
4585 make the real symbol dynamic. */
4586 if ((h
== hi
|| !hi
->forced_local
)
4587 && (bfd_link_dll (info
)
4597 hi
->ref_dynamic
= 1;
4602 hi
->def_dynamic
= 1;
4605 /* If the indirect symbol has been forced local, don't
4606 make the real symbol dynamic. */
4607 if ((h
== hi
|| !hi
->forced_local
)
4610 || (h
->u
.weakdef
!= NULL
4612 && h
->u
.weakdef
->dynindx
!= -1)))
4616 /* Check to see if we need to add an indirect symbol for
4617 the default name. */
4619 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
4620 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4621 sec
, value
, &old_bfd
, &dynsym
))
4622 goto error_free_vers
;
4624 /* Check the alignment when a common symbol is involved. This
4625 can change when a common symbol is overridden by a normal
4626 definition or a common symbol is ignored due to the old
4627 normal definition. We need to make sure the maximum
4628 alignment is maintained. */
4629 if ((old_alignment
|| common
)
4630 && h
->root
.type
!= bfd_link_hash_common
)
4632 unsigned int common_align
;
4633 unsigned int normal_align
;
4634 unsigned int symbol_align
;
4638 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
4639 || h
->root
.type
== bfd_link_hash_defweak
);
4641 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4642 if (h
->root
.u
.def
.section
->owner
!= NULL
4643 && (h
->root
.u
.def
.section
->owner
->flags
4644 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
4646 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4647 if (normal_align
> symbol_align
)
4648 normal_align
= symbol_align
;
4651 normal_align
= symbol_align
;
4655 common_align
= old_alignment
;
4656 common_bfd
= old_bfd
;
4661 common_align
= bfd_log2 (isym
->st_value
);
4663 normal_bfd
= old_bfd
;
4666 if (normal_align
< common_align
)
4668 /* PR binutils/2735 */
4669 if (normal_bfd
== NULL
)
4671 /* xgettext:c-format */
4672 (_("Warning: alignment %u of common symbol `%s' in %B is"
4673 " greater than the alignment (%u) of its section %A"),
4674 common_bfd
, h
->root
.u
.def
.section
,
4675 1 << common_align
, name
, 1 << normal_align
);
4678 /* xgettext:c-format */
4679 (_("Warning: alignment %u of symbol `%s' in %B"
4680 " is smaller than %u in %B"),
4681 normal_bfd
, common_bfd
,
4682 1 << normal_align
, name
, 1 << common_align
);
4686 /* Remember the symbol size if it isn't undefined. */
4687 if (isym
->st_size
!= 0
4688 && isym
->st_shndx
!= SHN_UNDEF
4689 && (definition
|| h
->size
== 0))
4692 && h
->size
!= isym
->st_size
4693 && ! size_change_ok
)
4695 /* xgettext:c-format */
4696 (_("Warning: size of symbol `%s' changed"
4697 " from %lu in %B to %lu in %B"),
4699 name
, (unsigned long) h
->size
,
4700 (unsigned long) isym
->st_size
);
4702 h
->size
= isym
->st_size
;
4705 /* If this is a common symbol, then we always want H->SIZE
4706 to be the size of the common symbol. The code just above
4707 won't fix the size if a common symbol becomes larger. We
4708 don't warn about a size change here, because that is
4709 covered by --warn-common. Allow changes between different
4711 if (h
->root
.type
== bfd_link_hash_common
)
4712 h
->size
= h
->root
.u
.c
.size
;
4714 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4715 && ((definition
&& !new_weak
)
4716 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
4717 || h
->type
== STT_NOTYPE
))
4719 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
4721 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4723 if (type
== STT_GNU_IFUNC
4724 && (abfd
->flags
& DYNAMIC
) != 0)
4727 if (h
->type
!= type
)
4729 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
4730 /* xgettext:c-format */
4732 (_("Warning: type of symbol `%s' changed"
4733 " from %d to %d in %B"),
4734 abfd
, name
, h
->type
, type
);
4740 /* Merge st_other field. */
4741 elf_merge_st_other (abfd
, h
, isym
, sec
, definition
, dynamic
);
4743 /* We don't want to make debug symbol dynamic. */
4745 && (sec
->flags
& SEC_DEBUGGING
)
4746 && !bfd_link_relocatable (info
))
4749 /* Nor should we make plugin symbols dynamic. */
4750 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4755 h
->target_internal
= isym
->st_target_internal
;
4756 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
4759 if (definition
&& !dynamic
)
4761 char *p
= strchr (name
, ELF_VER_CHR
);
4762 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4764 /* Queue non-default versions so that .symver x, x@FOO
4765 aliases can be checked. */
4768 amt
= ((isymend
- isym
+ 1)
4769 * sizeof (struct elf_link_hash_entry
*));
4771 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4773 goto error_free_vers
;
4775 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4779 if (dynsym
&& h
->dynindx
== -1)
4781 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4782 goto error_free_vers
;
4783 if (h
->u
.weakdef
!= NULL
4785 && h
->u
.weakdef
->dynindx
== -1)
4787 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4788 goto error_free_vers
;
4791 else if (h
->dynindx
!= -1)
4792 /* If the symbol already has a dynamic index, but
4793 visibility says it should not be visible, turn it into
4795 switch (ELF_ST_VISIBILITY (h
->other
))
4799 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4804 /* Don't add DT_NEEDED for references from the dummy bfd nor
4805 for unmatched symbol. */
4810 && h
->ref_regular_nonweak
4812 || (old_bfd
->flags
& BFD_PLUGIN
) == 0))
4813 || (h
->ref_dynamic_nonweak
4814 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
4815 && !on_needed_list (elf_dt_name (abfd
),
4816 htab
->needed
, NULL
))))
4819 const char *soname
= elf_dt_name (abfd
);
4821 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
4822 h
->root
.root
.string
);
4824 /* A symbol from a library loaded via DT_NEEDED of some
4825 other library is referenced by a regular object.
4826 Add a DT_NEEDED entry for it. Issue an error if
4827 --no-add-needed is used and the reference was not
4830 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4833 /* xgettext:c-format */
4834 (_("%B: undefined reference to symbol '%s'"),
4836 bfd_set_error (bfd_error_missing_dso
);
4837 goto error_free_vers
;
4840 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
4841 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
4844 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4846 goto error_free_vers
;
4848 BFD_ASSERT (ret
== 0);
4853 if (extversym
!= NULL
)
4859 if (isymbuf
!= NULL
)
4865 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4869 /* Restore the symbol table. */
4870 old_ent
= (char *) old_tab
+ tabsize
;
4871 memset (elf_sym_hashes (abfd
), 0,
4872 extsymcount
* sizeof (struct elf_link_hash_entry
*));
4873 htab
->root
.table
.table
= old_table
;
4874 htab
->root
.table
.size
= old_size
;
4875 htab
->root
.table
.count
= old_count
;
4876 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4877 htab
->root
.undefs
= old_undefs
;
4878 htab
->root
.undefs_tail
= old_undefs_tail
;
4879 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
4882 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4884 struct bfd_hash_entry
*p
;
4885 struct elf_link_hash_entry
*h
;
4887 unsigned int alignment_power
;
4889 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4891 h
= (struct elf_link_hash_entry
*) p
;
4892 if (h
->root
.type
== bfd_link_hash_warning
)
4893 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4895 /* Preserve the maximum alignment and size for common
4896 symbols even if this dynamic lib isn't on DT_NEEDED
4897 since it can still be loaded at run time by another
4899 if (h
->root
.type
== bfd_link_hash_common
)
4901 size
= h
->root
.u
.c
.size
;
4902 alignment_power
= h
->root
.u
.c
.p
->alignment_power
;
4907 alignment_power
= 0;
4909 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4910 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4911 h
= (struct elf_link_hash_entry
*) p
;
4912 if (h
->root
.type
== bfd_link_hash_warning
)
4914 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4915 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4916 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4918 if (h
->root
.type
== bfd_link_hash_common
)
4920 if (size
> h
->root
.u
.c
.size
)
4921 h
->root
.u
.c
.size
= size
;
4922 if (alignment_power
> h
->root
.u
.c
.p
->alignment_power
)
4923 h
->root
.u
.c
.p
->alignment_power
= alignment_power
;
4928 /* Make a special call to the linker "notice" function to
4929 tell it that symbols added for crefs may need to be removed. */
4930 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
4931 goto error_free_vers
;
4934 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4936 if (nondeflt_vers
!= NULL
)
4937 free (nondeflt_vers
);
4941 if (old_tab
!= NULL
)
4943 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
4944 goto error_free_vers
;
4949 /* Now that all the symbols from this input file are created, if
4950 not performing a relocatable link, handle .symver foo, foo@BAR
4951 such that any relocs against foo become foo@BAR. */
4952 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
4956 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4958 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4959 char *shortname
, *p
;
4961 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4963 || (h
->root
.type
!= bfd_link_hash_defined
4964 && h
->root
.type
!= bfd_link_hash_defweak
))
4967 amt
= p
- h
->root
.root
.string
;
4968 shortname
= (char *) bfd_malloc (amt
+ 1);
4970 goto error_free_vers
;
4971 memcpy (shortname
, h
->root
.root
.string
, amt
);
4972 shortname
[amt
] = '\0';
4974 hi
= (struct elf_link_hash_entry
*)
4975 bfd_link_hash_lookup (&htab
->root
, shortname
,
4976 FALSE
, FALSE
, FALSE
);
4978 && hi
->root
.type
== h
->root
.type
4979 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4980 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4982 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4983 hi
->root
.type
= bfd_link_hash_indirect
;
4984 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4985 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4986 sym_hash
= elf_sym_hashes (abfd
);
4988 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4989 if (sym_hash
[symidx
] == hi
)
4991 sym_hash
[symidx
] = h
;
4997 free (nondeflt_vers
);
4998 nondeflt_vers
= NULL
;
5001 /* Now set the weakdefs field correctly for all the weak defined
5002 symbols we found. The only way to do this is to search all the
5003 symbols. Since we only need the information for non functions in
5004 dynamic objects, that's the only time we actually put anything on
5005 the list WEAKS. We need this information so that if a regular
5006 object refers to a symbol defined weakly in a dynamic object, the
5007 real symbol in the dynamic object is also put in the dynamic
5008 symbols; we also must arrange for both symbols to point to the
5009 same memory location. We could handle the general case of symbol
5010 aliasing, but a general symbol alias can only be generated in
5011 assembler code, handling it correctly would be very time
5012 consuming, and other ELF linkers don't handle general aliasing
5016 struct elf_link_hash_entry
**hpp
;
5017 struct elf_link_hash_entry
**hppend
;
5018 struct elf_link_hash_entry
**sorted_sym_hash
;
5019 struct elf_link_hash_entry
*h
;
5022 /* Since we have to search the whole symbol list for each weak
5023 defined symbol, search time for N weak defined symbols will be
5024 O(N^2). Binary search will cut it down to O(NlogN). */
5026 amt
*= sizeof (struct elf_link_hash_entry
*);
5027 sorted_sym_hash
= (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5028 if (sorted_sym_hash
== NULL
)
5030 sym_hash
= sorted_sym_hash
;
5031 hpp
= elf_sym_hashes (abfd
);
5032 hppend
= hpp
+ extsymcount
;
5034 for (; hpp
< hppend
; hpp
++)
5038 && h
->root
.type
== bfd_link_hash_defined
5039 && !bed
->is_function_type (h
->type
))
5047 qsort (sorted_sym_hash
, sym_count
,
5048 sizeof (struct elf_link_hash_entry
*),
5051 while (weaks
!= NULL
)
5053 struct elf_link_hash_entry
*hlook
;
5056 size_t i
, j
, idx
= 0;
5059 weaks
= hlook
->u
.weakdef
;
5060 hlook
->u
.weakdef
= NULL
;
5062 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
5063 || hlook
->root
.type
== bfd_link_hash_defweak
5064 || hlook
->root
.type
== bfd_link_hash_common
5065 || hlook
->root
.type
== bfd_link_hash_indirect
);
5066 slook
= hlook
->root
.u
.def
.section
;
5067 vlook
= hlook
->root
.u
.def
.value
;
5073 bfd_signed_vma vdiff
;
5075 h
= sorted_sym_hash
[idx
];
5076 vdiff
= vlook
- h
->root
.u
.def
.value
;
5083 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5093 /* We didn't find a value/section match. */
5097 /* With multiple aliases, or when the weak symbol is already
5098 strongly defined, we have multiple matching symbols and
5099 the binary search above may land on any of them. Step
5100 one past the matching symbol(s). */
5103 h
= sorted_sym_hash
[idx
];
5104 if (h
->root
.u
.def
.section
!= slook
5105 || h
->root
.u
.def
.value
!= vlook
)
5109 /* Now look back over the aliases. Since we sorted by size
5110 as well as value and section, we'll choose the one with
5111 the largest size. */
5114 h
= sorted_sym_hash
[idx
];
5116 /* Stop if value or section doesn't match. */
5117 if (h
->root
.u
.def
.section
!= slook
5118 || h
->root
.u
.def
.value
!= vlook
)
5120 else if (h
!= hlook
)
5122 hlook
->u
.weakdef
= h
;
5124 /* If the weak definition is in the list of dynamic
5125 symbols, make sure the real definition is put
5127 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5129 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5132 free (sorted_sym_hash
);
5137 /* If the real definition is in the list of dynamic
5138 symbols, make sure the weak definition is put
5139 there as well. If we don't do this, then the
5140 dynamic loader might not merge the entries for the
5141 real definition and the weak definition. */
5142 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5144 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5145 goto err_free_sym_hash
;
5152 free (sorted_sym_hash
);
5155 if (bed
->check_directives
5156 && !(*bed
->check_directives
) (abfd
, info
))
5159 if (!info
->check_relocs_after_open_input
5160 && !_bfd_elf_link_check_relocs (abfd
, info
))
5163 /* If this is a non-traditional link, try to optimize the handling
5164 of the .stab/.stabstr sections. */
5166 && ! info
->traditional_format
5167 && is_elf_hash_table (htab
)
5168 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5172 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5173 if (stabstr
!= NULL
)
5175 bfd_size_type string_offset
= 0;
5178 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5179 if (CONST_STRNEQ (stab
->name
, ".stab")
5180 && (!stab
->name
[5] ||
5181 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5182 && (stab
->flags
& SEC_MERGE
) == 0
5183 && !bfd_is_abs_section (stab
->output_section
))
5185 struct bfd_elf_section_data
*secdata
;
5187 secdata
= elf_section_data (stab
);
5188 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5189 stabstr
, &secdata
->sec_info
,
5192 if (secdata
->sec_info
)
5193 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5198 if (is_elf_hash_table (htab
) && add_needed
)
5200 /* Add this bfd to the loaded list. */
5201 struct elf_link_loaded_list
*n
;
5203 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5207 n
->next
= htab
->loaded
;
5214 if (old_tab
!= NULL
)
5216 if (old_strtab
!= NULL
)
5218 if (nondeflt_vers
!= NULL
)
5219 free (nondeflt_vers
);
5220 if (extversym
!= NULL
)
5223 if (isymbuf
!= NULL
)
5229 /* Return the linker hash table entry of a symbol that might be
5230 satisfied by an archive symbol. Return -1 on error. */
5232 struct elf_link_hash_entry
*
5233 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5234 struct bfd_link_info
*info
,
5237 struct elf_link_hash_entry
*h
;
5241 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
5245 /* If this is a default version (the name contains @@), look up the
5246 symbol again with only one `@' as well as without the version.
5247 The effect is that references to the symbol with and without the
5248 version will be matched by the default symbol in the archive. */
5250 p
= strchr (name
, ELF_VER_CHR
);
5251 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5254 /* First check with only one `@'. */
5255 len
= strlen (name
);
5256 copy
= (char *) bfd_alloc (abfd
, len
);
5258 return (struct elf_link_hash_entry
*) 0 - 1;
5260 first
= p
- name
+ 1;
5261 memcpy (copy
, name
, first
);
5262 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5264 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
5267 /* We also need to check references to the symbol without the
5269 copy
[first
- 1] = '\0';
5270 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5271 FALSE
, FALSE
, TRUE
);
5274 bfd_release (abfd
, copy
);
5278 /* Add symbols from an ELF archive file to the linker hash table. We
5279 don't use _bfd_generic_link_add_archive_symbols because we need to
5280 handle versioned symbols.
5282 Fortunately, ELF archive handling is simpler than that done by
5283 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5284 oddities. In ELF, if we find a symbol in the archive map, and the
5285 symbol is currently undefined, we know that we must pull in that
5288 Unfortunately, we do have to make multiple passes over the symbol
5289 table until nothing further is resolved. */
5292 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5295 unsigned char *included
= NULL
;
5299 const struct elf_backend_data
*bed
;
5300 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5301 (bfd
*, struct bfd_link_info
*, const char *);
5303 if (! bfd_has_map (abfd
))
5305 /* An empty archive is a special case. */
5306 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5308 bfd_set_error (bfd_error_no_armap
);
5312 /* Keep track of all symbols we know to be already defined, and all
5313 files we know to be already included. This is to speed up the
5314 second and subsequent passes. */
5315 c
= bfd_ardata (abfd
)->symdef_count
;
5319 amt
*= sizeof (*included
);
5320 included
= (unsigned char *) bfd_zmalloc (amt
);
5321 if (included
== NULL
)
5324 symdefs
= bfd_ardata (abfd
)->symdefs
;
5325 bed
= get_elf_backend_data (abfd
);
5326 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5339 symdefend
= symdef
+ c
;
5340 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5342 struct elf_link_hash_entry
*h
;
5344 struct bfd_link_hash_entry
*undefs_tail
;
5349 if (symdef
->file_offset
== last
)
5355 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5356 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
5362 if (h
->root
.type
== bfd_link_hash_common
)
5364 /* We currently have a common symbol. The archive map contains
5365 a reference to this symbol, so we may want to include it. We
5366 only want to include it however, if this archive element
5367 contains a definition of the symbol, not just another common
5370 Unfortunately some archivers (including GNU ar) will put
5371 declarations of common symbols into their archive maps, as
5372 well as real definitions, so we cannot just go by the archive
5373 map alone. Instead we must read in the element's symbol
5374 table and check that to see what kind of symbol definition
5376 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5379 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5381 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5382 /* Symbol must be defined. Don't check it again. */
5387 /* We need to include this archive member. */
5388 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5389 if (element
== NULL
)
5392 if (! bfd_check_format (element
, bfd_object
))
5395 undefs_tail
= info
->hash
->undefs_tail
;
5397 if (!(*info
->callbacks
5398 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5400 if (!bfd_link_add_symbols (element
, info
))
5403 /* If there are any new undefined symbols, we need to make
5404 another pass through the archive in order to see whether
5405 they can be defined. FIXME: This isn't perfect, because
5406 common symbols wind up on undefs_tail and because an
5407 undefined symbol which is defined later on in this pass
5408 does not require another pass. This isn't a bug, but it
5409 does make the code less efficient than it could be. */
5410 if (undefs_tail
!= info
->hash
->undefs_tail
)
5413 /* Look backward to mark all symbols from this object file
5414 which we have already seen in this pass. */
5418 included
[mark
] = TRUE
;
5423 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5425 /* We mark subsequent symbols from this object file as we go
5426 on through the loop. */
5427 last
= symdef
->file_offset
;
5437 if (included
!= NULL
)
5442 /* Given an ELF BFD, add symbols to the global hash table as
5446 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5448 switch (bfd_get_format (abfd
))
5451 return elf_link_add_object_symbols (abfd
, info
);
5453 return elf_link_add_archive_symbols (abfd
, info
);
5455 bfd_set_error (bfd_error_wrong_format
);
5460 struct hash_codes_info
5462 unsigned long *hashcodes
;
5466 /* This function will be called though elf_link_hash_traverse to store
5467 all hash value of the exported symbols in an array. */
5470 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5472 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5477 /* Ignore indirect symbols. These are added by the versioning code. */
5478 if (h
->dynindx
== -1)
5481 name
= h
->root
.root
.string
;
5482 if (h
->versioned
>= versioned
)
5484 char *p
= strchr (name
, ELF_VER_CHR
);
5487 alc
= (char *) bfd_malloc (p
- name
+ 1);
5493 memcpy (alc
, name
, p
- name
);
5494 alc
[p
- name
] = '\0';
5499 /* Compute the hash value. */
5500 ha
= bfd_elf_hash (name
);
5502 /* Store the found hash value in the array given as the argument. */
5503 *(inf
->hashcodes
)++ = ha
;
5505 /* And store it in the struct so that we can put it in the hash table
5507 h
->u
.elf_hash_value
= ha
;
5515 struct collect_gnu_hash_codes
5518 const struct elf_backend_data
*bed
;
5519 unsigned long int nsyms
;
5520 unsigned long int maskbits
;
5521 unsigned long int *hashcodes
;
5522 unsigned long int *hashval
;
5523 unsigned long int *indx
;
5524 unsigned long int *counts
;
5527 long int min_dynindx
;
5528 unsigned long int bucketcount
;
5529 unsigned long int symindx
;
5530 long int local_indx
;
5531 long int shift1
, shift2
;
5532 unsigned long int mask
;
5536 /* This function will be called though elf_link_hash_traverse to store
5537 all hash value of the exported symbols in an array. */
5540 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5542 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5547 /* Ignore indirect symbols. These are added by the versioning code. */
5548 if (h
->dynindx
== -1)
5551 /* Ignore also local symbols and undefined symbols. */
5552 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5555 name
= h
->root
.root
.string
;
5556 if (h
->versioned
>= versioned
)
5558 char *p
= strchr (name
, ELF_VER_CHR
);
5561 alc
= (char *) bfd_malloc (p
- name
+ 1);
5567 memcpy (alc
, name
, p
- name
);
5568 alc
[p
- name
] = '\0';
5573 /* Compute the hash value. */
5574 ha
= bfd_elf_gnu_hash (name
);
5576 /* Store the found hash value in the array for compute_bucket_count,
5577 and also for .dynsym reordering purposes. */
5578 s
->hashcodes
[s
->nsyms
] = ha
;
5579 s
->hashval
[h
->dynindx
] = ha
;
5581 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5582 s
->min_dynindx
= h
->dynindx
;
5590 /* This function will be called though elf_link_hash_traverse to do
5591 final dynaminc symbol renumbering. */
5594 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5596 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5597 unsigned long int bucket
;
5598 unsigned long int val
;
5600 /* Ignore indirect symbols. */
5601 if (h
->dynindx
== -1)
5604 /* Ignore also local symbols and undefined symbols. */
5605 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5607 if (h
->dynindx
>= s
->min_dynindx
)
5608 h
->dynindx
= s
->local_indx
++;
5612 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5613 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5614 & ((s
->maskbits
>> s
->shift1
) - 1);
5615 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5617 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5618 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5619 if (s
->counts
[bucket
] == 1)
5620 /* Last element terminates the chain. */
5622 bfd_put_32 (s
->output_bfd
, val
,
5623 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5624 --s
->counts
[bucket
];
5625 h
->dynindx
= s
->indx
[bucket
]++;
5629 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5632 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5634 return !(h
->forced_local
5635 || h
->root
.type
== bfd_link_hash_undefined
5636 || h
->root
.type
== bfd_link_hash_undefweak
5637 || ((h
->root
.type
== bfd_link_hash_defined
5638 || h
->root
.type
== bfd_link_hash_defweak
)
5639 && h
->root
.u
.def
.section
->output_section
== NULL
));
5642 /* Array used to determine the number of hash table buckets to use
5643 based on the number of symbols there are. If there are fewer than
5644 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5645 fewer than 37 we use 17 buckets, and so forth. We never use more
5646 than 32771 buckets. */
5648 static const size_t elf_buckets
[] =
5650 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5654 /* Compute bucket count for hashing table. We do not use a static set
5655 of possible tables sizes anymore. Instead we determine for all
5656 possible reasonable sizes of the table the outcome (i.e., the
5657 number of collisions etc) and choose the best solution. The
5658 weighting functions are not too simple to allow the table to grow
5659 without bounds. Instead one of the weighting factors is the size.
5660 Therefore the result is always a good payoff between few collisions
5661 (= short chain lengths) and table size. */
5663 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5664 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5665 unsigned long int nsyms
,
5668 size_t best_size
= 0;
5669 unsigned long int i
;
5671 /* We have a problem here. The following code to optimize the table
5672 size requires an integer type with more the 32 bits. If
5673 BFD_HOST_U_64_BIT is set we know about such a type. */
5674 #ifdef BFD_HOST_U_64_BIT
5679 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5680 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5681 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5682 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5683 unsigned long int *counts
;
5685 unsigned int no_improvement_count
= 0;
5687 /* Possible optimization parameters: if we have NSYMS symbols we say
5688 that the hashing table must at least have NSYMS/4 and at most
5690 minsize
= nsyms
/ 4;
5693 best_size
= maxsize
= nsyms
* 2;
5698 if ((best_size
& 31) == 0)
5702 /* Create array where we count the collisions in. We must use bfd_malloc
5703 since the size could be large. */
5705 amt
*= sizeof (unsigned long int);
5706 counts
= (unsigned long int *) bfd_malloc (amt
);
5710 /* Compute the "optimal" size for the hash table. The criteria is a
5711 minimal chain length. The minor criteria is (of course) the size
5713 for (i
= minsize
; i
< maxsize
; ++i
)
5715 /* Walk through the array of hashcodes and count the collisions. */
5716 BFD_HOST_U_64_BIT max
;
5717 unsigned long int j
;
5718 unsigned long int fact
;
5720 if (gnu_hash
&& (i
& 31) == 0)
5723 memset (counts
, '\0', i
* sizeof (unsigned long int));
5725 /* Determine how often each hash bucket is used. */
5726 for (j
= 0; j
< nsyms
; ++j
)
5727 ++counts
[hashcodes
[j
] % i
];
5729 /* For the weight function we need some information about the
5730 pagesize on the target. This is information need not be 100%
5731 accurate. Since this information is not available (so far) we
5732 define it here to a reasonable default value. If it is crucial
5733 to have a better value some day simply define this value. */
5734 # ifndef BFD_TARGET_PAGESIZE
5735 # define BFD_TARGET_PAGESIZE (4096)
5738 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5740 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5743 /* Variant 1: optimize for short chains. We add the squares
5744 of all the chain lengths (which favors many small chain
5745 over a few long chains). */
5746 for (j
= 0; j
< i
; ++j
)
5747 max
+= counts
[j
] * counts
[j
];
5749 /* This adds penalties for the overall size of the table. */
5750 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5753 /* Variant 2: Optimize a lot more for small table. Here we
5754 also add squares of the size but we also add penalties for
5755 empty slots (the +1 term). */
5756 for (j
= 0; j
< i
; ++j
)
5757 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5759 /* The overall size of the table is considered, but not as
5760 strong as in variant 1, where it is squared. */
5761 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5765 /* Compare with current best results. */
5766 if (max
< best_chlen
)
5770 no_improvement_count
= 0;
5772 /* PR 11843: Avoid futile long searches for the best bucket size
5773 when there are a large number of symbols. */
5774 else if (++no_improvement_count
== 100)
5781 #endif /* defined (BFD_HOST_U_64_BIT) */
5783 /* This is the fallback solution if no 64bit type is available or if we
5784 are not supposed to spend much time on optimizations. We select the
5785 bucket count using a fixed set of numbers. */
5786 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5788 best_size
= elf_buckets
[i
];
5789 if (nsyms
< elf_buckets
[i
+ 1])
5792 if (gnu_hash
&& best_size
< 2)
5799 /* Size any SHT_GROUP section for ld -r. */
5802 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
5806 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
5807 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
5808 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
5813 /* Set a default stack segment size. The value in INFO wins. If it
5814 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5815 undefined it is initialized. */
5818 bfd_elf_stack_segment_size (bfd
*output_bfd
,
5819 struct bfd_link_info
*info
,
5820 const char *legacy_symbol
,
5821 bfd_vma default_size
)
5823 struct elf_link_hash_entry
*h
= NULL
;
5825 /* Look for legacy symbol. */
5827 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
5828 FALSE
, FALSE
, FALSE
);
5829 if (h
&& (h
->root
.type
== bfd_link_hash_defined
5830 || h
->root
.type
== bfd_link_hash_defweak
)
5832 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
5834 /* The symbol has no type if specified on the command line. */
5835 h
->type
= STT_OBJECT
;
5836 if (info
->stacksize
)
5837 /* xgettext:c-format */
5838 _bfd_error_handler (_("%B: stack size specified and %s set"),
5839 output_bfd
, legacy_symbol
);
5840 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
5841 /* xgettext:c-format */
5842 _bfd_error_handler (_("%B: %s not absolute"),
5843 output_bfd
, legacy_symbol
);
5845 info
->stacksize
= h
->root
.u
.def
.value
;
5848 if (!info
->stacksize
)
5849 /* If the user didn't set a size, or explicitly inhibit the
5850 size, set it now. */
5851 info
->stacksize
= default_size
;
5853 /* Provide the legacy symbol, if it is referenced. */
5854 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
5855 || h
->root
.type
== bfd_link_hash_undefweak
))
5857 struct bfd_link_hash_entry
*bh
= NULL
;
5859 if (!(_bfd_generic_link_add_one_symbol
5860 (info
, output_bfd
, legacy_symbol
,
5861 BSF_GLOBAL
, bfd_abs_section_ptr
,
5862 info
->stacksize
>= 0 ? info
->stacksize
: 0,
5863 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
5866 h
= (struct elf_link_hash_entry
*) bh
;
5868 h
->type
= STT_OBJECT
;
5874 /* Set up the sizes and contents of the ELF dynamic sections. This is
5875 called by the ELF linker emulation before_allocation routine. We
5876 must set the sizes of the sections before the linker sets the
5877 addresses of the various sections. */
5880 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5883 const char *filter_shlib
,
5885 const char *depaudit
,
5886 const char * const *auxiliary_filters
,
5887 struct bfd_link_info
*info
,
5888 asection
**sinterpptr
)
5892 const struct elf_backend_data
*bed
;
5893 struct elf_info_failed asvinfo
;
5897 soname_indx
= (size_t) -1;
5899 if (!is_elf_hash_table (info
->hash
))
5902 bed
= get_elf_backend_data (output_bfd
);
5904 /* Any syms created from now on start with -1 in
5905 got.refcount/offset and plt.refcount/offset. */
5906 elf_hash_table (info
)->init_got_refcount
5907 = elf_hash_table (info
)->init_got_offset
;
5908 elf_hash_table (info
)->init_plt_refcount
5909 = elf_hash_table (info
)->init_plt_offset
;
5911 if (bfd_link_relocatable (info
)
5912 && !_bfd_elf_size_group_sections (info
))
5915 /* The backend may have to create some sections regardless of whether
5916 we're dynamic or not. */
5917 if (bed
->elf_backend_always_size_sections
5918 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5921 /* Determine any GNU_STACK segment requirements, after the backend
5922 has had a chance to set a default segment size. */
5923 if (info
->execstack
)
5924 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
5925 else if (info
->noexecstack
)
5926 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
5930 asection
*notesec
= NULL
;
5933 for (inputobj
= info
->input_bfds
;
5935 inputobj
= inputobj
->link
.next
)
5940 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
5942 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5945 if (s
->flags
& SEC_CODE
)
5949 else if (bed
->default_execstack
)
5952 if (notesec
|| info
->stacksize
> 0)
5953 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
5954 if (notesec
&& exec
&& bfd_link_relocatable (info
)
5955 && notesec
->output_section
!= bfd_abs_section_ptr
)
5956 notesec
->output_section
->flags
|= SEC_CODE
;
5959 dynobj
= elf_hash_table (info
)->dynobj
;
5961 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
5963 struct elf_info_failed eif
;
5964 struct elf_link_hash_entry
*h
;
5966 struct bfd_elf_version_tree
*t
;
5967 struct bfd_elf_version_expr
*d
;
5969 bfd_boolean all_defined
;
5971 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
5972 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
5976 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5978 if (soname_indx
== (size_t) -1
5979 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5985 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5987 info
->flags
|= DF_SYMBOLIC
;
5995 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5997 if (indx
== (size_t) -1)
6000 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
6001 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
6005 if (filter_shlib
!= NULL
)
6009 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6010 filter_shlib
, TRUE
);
6011 if (indx
== (size_t) -1
6012 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
6016 if (auxiliary_filters
!= NULL
)
6018 const char * const *p
;
6020 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
6024 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6026 if (indx
== (size_t) -1
6027 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
6036 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
6038 if (indx
== (size_t) -1
6039 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
6043 if (depaudit
!= NULL
)
6047 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
6049 if (indx
== (size_t) -1
6050 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
6057 /* If we are supposed to export all symbols into the dynamic symbol
6058 table (this is not the normal case), then do so. */
6059 if (info
->export_dynamic
6060 || (bfd_link_executable (info
) && info
->dynamic
))
6062 elf_link_hash_traverse (elf_hash_table (info
),
6063 _bfd_elf_export_symbol
,
6069 /* Make all global versions with definition. */
6070 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6071 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6072 if (!d
->symver
&& d
->literal
)
6074 const char *verstr
, *name
;
6075 size_t namelen
, verlen
, newlen
;
6076 char *newname
, *p
, leading_char
;
6077 struct elf_link_hash_entry
*newh
;
6079 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6081 namelen
= strlen (name
) + (leading_char
!= '\0');
6083 verlen
= strlen (verstr
);
6084 newlen
= namelen
+ verlen
+ 3;
6086 newname
= (char *) bfd_malloc (newlen
);
6087 if (newname
== NULL
)
6089 newname
[0] = leading_char
;
6090 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6092 /* Check the hidden versioned definition. */
6093 p
= newname
+ namelen
;
6095 memcpy (p
, verstr
, verlen
+ 1);
6096 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6097 newname
, FALSE
, FALSE
,
6100 || (newh
->root
.type
!= bfd_link_hash_defined
6101 && newh
->root
.type
!= bfd_link_hash_defweak
))
6103 /* Check the default versioned definition. */
6105 memcpy (p
, verstr
, verlen
+ 1);
6106 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6107 newname
, FALSE
, FALSE
,
6112 /* Mark this version if there is a definition and it is
6113 not defined in a shared object. */
6115 && !newh
->def_dynamic
6116 && (newh
->root
.type
== bfd_link_hash_defined
6117 || newh
->root
.type
== bfd_link_hash_defweak
))
6121 /* Attach all the symbols to their version information. */
6122 asvinfo
.info
= info
;
6123 asvinfo
.failed
= FALSE
;
6125 elf_link_hash_traverse (elf_hash_table (info
),
6126 _bfd_elf_link_assign_sym_version
,
6131 if (!info
->allow_undefined_version
)
6133 /* Check if all global versions have a definition. */
6135 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6136 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6137 if (d
->literal
&& !d
->symver
&& !d
->script
)
6140 (_("%s: undefined version: %s"),
6141 d
->pattern
, t
->name
);
6142 all_defined
= FALSE
;
6147 bfd_set_error (bfd_error_bad_value
);
6152 /* Find all symbols which were defined in a dynamic object and make
6153 the backend pick a reasonable value for them. */
6154 elf_link_hash_traverse (elf_hash_table (info
),
6155 _bfd_elf_adjust_dynamic_symbol
,
6160 /* Add some entries to the .dynamic section. We fill in some of the
6161 values later, in bfd_elf_final_link, but we must add the entries
6162 now so that we know the final size of the .dynamic section. */
6164 /* If there are initialization and/or finalization functions to
6165 call then add the corresponding DT_INIT/DT_FINI entries. */
6166 h
= (info
->init_function
6167 ? elf_link_hash_lookup (elf_hash_table (info
),
6168 info
->init_function
, FALSE
,
6175 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
6178 h
= (info
->fini_function
6179 ? elf_link_hash_lookup (elf_hash_table (info
),
6180 info
->fini_function
, FALSE
,
6187 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
6191 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
6192 if (s
!= NULL
&& s
->linker_has_input
)
6194 /* DT_PREINIT_ARRAY is not allowed in shared library. */
6195 if (! bfd_link_executable (info
))
6200 for (sub
= info
->input_bfds
; sub
!= NULL
;
6201 sub
= sub
->link
.next
)
6202 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
6203 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6204 if (elf_section_data (o
)->this_hdr
.sh_type
6205 == SHT_PREINIT_ARRAY
)
6208 (_("%B: .preinit_array section is not allowed in DSO"),
6213 bfd_set_error (bfd_error_nonrepresentable_section
);
6217 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
6218 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
6221 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
6222 if (s
!= NULL
&& s
->linker_has_input
)
6224 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
6225 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
6228 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
6229 if (s
!= NULL
&& s
->linker_has_input
)
6231 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
6232 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
6236 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
6237 /* If .dynstr is excluded from the link, we don't want any of
6238 these tags. Strictly, we should be checking each section
6239 individually; This quick check covers for the case where
6240 someone does a /DISCARD/ : { *(*) }. */
6241 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
6243 bfd_size_type strsize
;
6245 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6246 if ((info
->emit_hash
6247 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
6248 || (info
->emit_gnu_hash
6249 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
6250 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
6251 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
6252 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
6253 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
6254 bed
->s
->sizeof_sym
))
6259 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
6262 /* The backend must work out the sizes of all the other dynamic
6265 && bed
->elf_backend_size_dynamic_sections
!= NULL
6266 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
6269 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6271 unsigned long section_sym_count
;
6272 struct bfd_elf_version_tree
*verdefs
;
6275 /* Set up the version definition section. */
6276 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6277 BFD_ASSERT (s
!= NULL
);
6279 /* We may have created additional version definitions if we are
6280 just linking a regular application. */
6281 verdefs
= info
->version_info
;
6283 /* Skip anonymous version tag. */
6284 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6285 verdefs
= verdefs
->next
;
6287 if (verdefs
== NULL
&& !info
->create_default_symver
)
6288 s
->flags
|= SEC_EXCLUDE
;
6293 struct bfd_elf_version_tree
*t
;
6295 Elf_Internal_Verdef def
;
6296 Elf_Internal_Verdaux defaux
;
6297 struct bfd_link_hash_entry
*bh
;
6298 struct elf_link_hash_entry
*h
;
6304 /* Make space for the base version. */
6305 size
+= sizeof (Elf_External_Verdef
);
6306 size
+= sizeof (Elf_External_Verdaux
);
6309 /* Make space for the default version. */
6310 if (info
->create_default_symver
)
6312 size
+= sizeof (Elf_External_Verdef
);
6316 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6318 struct bfd_elf_version_deps
*n
;
6320 /* Don't emit base version twice. */
6324 size
+= sizeof (Elf_External_Verdef
);
6325 size
+= sizeof (Elf_External_Verdaux
);
6328 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6329 size
+= sizeof (Elf_External_Verdaux
);
6333 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6334 if (s
->contents
== NULL
&& s
->size
!= 0)
6337 /* Fill in the version definition section. */
6341 def
.vd_version
= VER_DEF_CURRENT
;
6342 def
.vd_flags
= VER_FLG_BASE
;
6345 if (info
->create_default_symver
)
6347 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6348 def
.vd_next
= sizeof (Elf_External_Verdef
);
6352 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6353 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6354 + sizeof (Elf_External_Verdaux
));
6357 if (soname_indx
!= (size_t) -1)
6359 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6361 def
.vd_hash
= bfd_elf_hash (soname
);
6362 defaux
.vda_name
= soname_indx
;
6369 name
= lbasename (output_bfd
->filename
);
6370 def
.vd_hash
= bfd_elf_hash (name
);
6371 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6373 if (indx
== (size_t) -1)
6375 defaux
.vda_name
= indx
;
6377 defaux
.vda_next
= 0;
6379 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6380 (Elf_External_Verdef
*) p
);
6381 p
+= sizeof (Elf_External_Verdef
);
6382 if (info
->create_default_symver
)
6384 /* Add a symbol representing this version. */
6386 if (! (_bfd_generic_link_add_one_symbol
6387 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6389 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6391 h
= (struct elf_link_hash_entry
*) bh
;
6394 h
->type
= STT_OBJECT
;
6395 h
->verinfo
.vertree
= NULL
;
6397 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6400 /* Create a duplicate of the base version with the same
6401 aux block, but different flags. */
6404 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6406 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6407 + sizeof (Elf_External_Verdaux
));
6410 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6411 (Elf_External_Verdef
*) p
);
6412 p
+= sizeof (Elf_External_Verdef
);
6414 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6415 (Elf_External_Verdaux
*) p
);
6416 p
+= sizeof (Elf_External_Verdaux
);
6418 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6421 struct bfd_elf_version_deps
*n
;
6423 /* Don't emit the base version twice. */
6428 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6431 /* Add a symbol representing this version. */
6433 if (! (_bfd_generic_link_add_one_symbol
6434 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6436 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6438 h
= (struct elf_link_hash_entry
*) bh
;
6441 h
->type
= STT_OBJECT
;
6442 h
->verinfo
.vertree
= t
;
6444 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6447 def
.vd_version
= VER_DEF_CURRENT
;
6449 if (t
->globals
.list
== NULL
6450 && t
->locals
.list
== NULL
6452 def
.vd_flags
|= VER_FLG_WEAK
;
6453 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6454 def
.vd_cnt
= cdeps
+ 1;
6455 def
.vd_hash
= bfd_elf_hash (t
->name
);
6456 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6459 /* If a basever node is next, it *must* be the last node in
6460 the chain, otherwise Verdef construction breaks. */
6461 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6462 BFD_ASSERT (t
->next
->next
== NULL
);
6464 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6465 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6466 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6468 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6469 (Elf_External_Verdef
*) p
);
6470 p
+= sizeof (Elf_External_Verdef
);
6472 defaux
.vda_name
= h
->dynstr_index
;
6473 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6475 defaux
.vda_next
= 0;
6476 if (t
->deps
!= NULL
)
6477 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6478 t
->name_indx
= defaux
.vda_name
;
6480 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6481 (Elf_External_Verdaux
*) p
);
6482 p
+= sizeof (Elf_External_Verdaux
);
6484 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6486 if (n
->version_needed
== NULL
)
6488 /* This can happen if there was an error in the
6490 defaux
.vda_name
= 0;
6494 defaux
.vda_name
= n
->version_needed
->name_indx
;
6495 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6498 if (n
->next
== NULL
)
6499 defaux
.vda_next
= 0;
6501 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6503 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6504 (Elf_External_Verdaux
*) p
);
6505 p
+= sizeof (Elf_External_Verdaux
);
6509 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
6510 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
6513 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6516 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
6518 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
6521 else if (info
->flags
& DF_BIND_NOW
)
6523 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
6529 if (bfd_link_executable (info
))
6530 info
->flags_1
&= ~ (DF_1_INITFIRST
6533 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
6537 /* Work out the size of the version reference section. */
6539 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6540 BFD_ASSERT (s
!= NULL
);
6542 struct elf_find_verdep_info sinfo
;
6545 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6546 if (sinfo
.vers
== 0)
6548 sinfo
.failed
= FALSE
;
6550 elf_link_hash_traverse (elf_hash_table (info
),
6551 _bfd_elf_link_find_version_dependencies
,
6556 if (elf_tdata (output_bfd
)->verref
== NULL
)
6557 s
->flags
|= SEC_EXCLUDE
;
6560 Elf_Internal_Verneed
*t
;
6565 /* Build the version dependency section. */
6568 for (t
= elf_tdata (output_bfd
)->verref
;
6572 Elf_Internal_Vernaux
*a
;
6574 size
+= sizeof (Elf_External_Verneed
);
6576 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6577 size
+= sizeof (Elf_External_Vernaux
);
6581 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6582 if (s
->contents
== NULL
)
6586 for (t
= elf_tdata (output_bfd
)->verref
;
6591 Elf_Internal_Vernaux
*a
;
6595 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6598 t
->vn_version
= VER_NEED_CURRENT
;
6600 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6601 elf_dt_name (t
->vn_bfd
) != NULL
6602 ? elf_dt_name (t
->vn_bfd
)
6603 : lbasename (t
->vn_bfd
->filename
),
6605 if (indx
== (size_t) -1)
6608 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6609 if (t
->vn_nextref
== NULL
)
6612 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6613 + caux
* sizeof (Elf_External_Vernaux
));
6615 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6616 (Elf_External_Verneed
*) p
);
6617 p
+= sizeof (Elf_External_Verneed
);
6619 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6621 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6622 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6623 a
->vna_nodename
, FALSE
);
6624 if (indx
== (size_t) -1)
6627 if (a
->vna_nextptr
== NULL
)
6630 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6632 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6633 (Elf_External_Vernaux
*) p
);
6634 p
+= sizeof (Elf_External_Vernaux
);
6638 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6639 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6642 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6646 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6647 && elf_tdata (output_bfd
)->cverdefs
== 0)
6648 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6649 §ion_sym_count
) == 0)
6651 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
6652 s
->flags
|= SEC_EXCLUDE
;
6658 /* Find the first non-excluded output section. We'll use its
6659 section symbol for some emitted relocs. */
6661 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6665 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6666 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6667 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6669 elf_hash_table (info
)->text_index_section
= s
;
6674 /* Find two non-excluded output sections, one for code, one for data.
6675 We'll use their section symbols for some emitted relocs. */
6677 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6681 /* Data first, since setting text_index_section changes
6682 _bfd_elf_link_omit_section_dynsym. */
6683 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6684 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6685 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6687 elf_hash_table (info
)->data_index_section
= s
;
6691 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6692 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6693 == (SEC_ALLOC
| SEC_READONLY
))
6694 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6696 elf_hash_table (info
)->text_index_section
= s
;
6700 if (elf_hash_table (info
)->text_index_section
== NULL
)
6701 elf_hash_table (info
)->text_index_section
6702 = elf_hash_table (info
)->data_index_section
;
6706 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6708 const struct elf_backend_data
*bed
;
6710 if (!is_elf_hash_table (info
->hash
))
6713 bed
= get_elf_backend_data (output_bfd
);
6714 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6716 if (elf_hash_table (info
)->dynamic_sections_created
)
6720 bfd_size_type dynsymcount
;
6721 unsigned long section_sym_count
;
6722 unsigned int dtagcount
;
6724 dynobj
= elf_hash_table (info
)->dynobj
;
6726 /* Assign dynsym indicies. In a shared library we generate a
6727 section symbol for each output section, which come first.
6728 Next come all of the back-end allocated local dynamic syms,
6729 followed by the rest of the global symbols. */
6731 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6732 §ion_sym_count
);
6734 /* Work out the size of the symbol version section. */
6735 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
6736 BFD_ASSERT (s
!= NULL
);
6737 if ((s
->flags
& SEC_EXCLUDE
) == 0)
6739 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6740 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6741 if (s
->contents
== NULL
)
6744 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6748 /* Set the size of the .dynsym and .hash sections. We counted
6749 the number of dynamic symbols in elf_link_add_object_symbols.
6750 We will build the contents of .dynsym and .hash when we build
6751 the final symbol table, because until then we do not know the
6752 correct value to give the symbols. We built the .dynstr
6753 section as we went along in elf_link_add_object_symbols. */
6754 s
= elf_hash_table (info
)->dynsym
;
6755 BFD_ASSERT (s
!= NULL
);
6756 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6758 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6759 if (s
->contents
== NULL
)
6762 /* The first entry in .dynsym is a dummy symbol. Clear all the
6763 section syms, in case we don't output them all. */
6764 ++section_sym_count
;
6765 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6767 elf_hash_table (info
)->bucketcount
= 0;
6769 /* Compute the size of the hashing table. As a side effect this
6770 computes the hash values for all the names we export. */
6771 if (info
->emit_hash
)
6773 unsigned long int *hashcodes
;
6774 struct hash_codes_info hashinf
;
6776 unsigned long int nsyms
;
6778 size_t hash_entry_size
;
6780 /* Compute the hash values for all exported symbols. At the same
6781 time store the values in an array so that we could use them for
6783 amt
= dynsymcount
* sizeof (unsigned long int);
6784 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
6785 if (hashcodes
== NULL
)
6787 hashinf
.hashcodes
= hashcodes
;
6788 hashinf
.error
= FALSE
;
6790 /* Put all hash values in HASHCODES. */
6791 elf_link_hash_traverse (elf_hash_table (info
),
6792 elf_collect_hash_codes
, &hashinf
);
6799 nsyms
= hashinf
.hashcodes
- hashcodes
;
6801 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6804 if (bucketcount
== 0)
6807 elf_hash_table (info
)->bucketcount
= bucketcount
;
6809 s
= bfd_get_linker_section (dynobj
, ".hash");
6810 BFD_ASSERT (s
!= NULL
);
6811 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6812 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6813 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6814 if (s
->contents
== NULL
)
6817 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6818 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6819 s
->contents
+ hash_entry_size
);
6822 if (info
->emit_gnu_hash
)
6825 unsigned char *contents
;
6826 struct collect_gnu_hash_codes cinfo
;
6830 memset (&cinfo
, 0, sizeof (cinfo
));
6832 /* Compute the hash values for all exported symbols. At the same
6833 time store the values in an array so that we could use them for
6835 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6836 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
6837 if (cinfo
.hashcodes
== NULL
)
6840 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6841 cinfo
.min_dynindx
= -1;
6842 cinfo
.output_bfd
= output_bfd
;
6845 /* Put all hash values in HASHCODES. */
6846 elf_link_hash_traverse (elf_hash_table (info
),
6847 elf_collect_gnu_hash_codes
, &cinfo
);
6850 free (cinfo
.hashcodes
);
6855 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6857 if (bucketcount
== 0)
6859 free (cinfo
.hashcodes
);
6863 s
= bfd_get_linker_section (dynobj
, ".gnu.hash");
6864 BFD_ASSERT (s
!= NULL
);
6866 if (cinfo
.nsyms
== 0)
6868 /* Empty .gnu.hash section is special. */
6869 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6870 free (cinfo
.hashcodes
);
6871 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6872 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6873 if (contents
== NULL
)
6875 s
->contents
= contents
;
6876 /* 1 empty bucket. */
6877 bfd_put_32 (output_bfd
, 1, contents
);
6878 /* SYMIDX above the special symbol 0. */
6879 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6880 /* Just one word for bitmask. */
6881 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6882 /* Only hash fn bloom filter. */
6883 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6884 /* No hashes are valid - empty bitmask. */
6885 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6886 /* No hashes in the only bucket. */
6887 bfd_put_32 (output_bfd
, 0,
6888 contents
+ 16 + bed
->s
->arch_size
/ 8);
6892 unsigned long int maskwords
, maskbitslog2
, x
;
6893 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6897 while ((x
>>= 1) != 0)
6899 if (maskbitslog2
< 3)
6901 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6902 maskbitslog2
= maskbitslog2
+ 3;
6904 maskbitslog2
= maskbitslog2
+ 2;
6905 if (bed
->s
->arch_size
== 64)
6907 if (maskbitslog2
== 5)
6913 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6914 cinfo
.shift2
= maskbitslog2
;
6915 cinfo
.maskbits
= 1 << maskbitslog2
;
6916 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6917 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6918 amt
+= maskwords
* sizeof (bfd_vma
);
6919 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
6920 if (cinfo
.bitmask
== NULL
)
6922 free (cinfo
.hashcodes
);
6926 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
6927 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6928 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6929 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6931 /* Determine how often each hash bucket is used. */
6932 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6933 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6934 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6936 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6937 if (cinfo
.counts
[i
] != 0)
6939 cinfo
.indx
[i
] = cnt
;
6940 cnt
+= cinfo
.counts
[i
];
6942 BFD_ASSERT (cnt
== dynsymcount
);
6943 cinfo
.bucketcount
= bucketcount
;
6944 cinfo
.local_indx
= cinfo
.min_dynindx
;
6946 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6947 s
->size
+= cinfo
.maskbits
/ 8;
6948 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6949 if (contents
== NULL
)
6951 free (cinfo
.bitmask
);
6952 free (cinfo
.hashcodes
);
6956 s
->contents
= contents
;
6957 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6958 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6959 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6960 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6961 contents
+= 16 + cinfo
.maskbits
/ 8;
6963 for (i
= 0; i
< bucketcount
; ++i
)
6965 if (cinfo
.counts
[i
] == 0)
6966 bfd_put_32 (output_bfd
, 0, contents
);
6968 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6972 cinfo
.contents
= contents
;
6974 /* Renumber dynamic symbols, populate .gnu.hash section. */
6975 elf_link_hash_traverse (elf_hash_table (info
),
6976 elf_renumber_gnu_hash_syms
, &cinfo
);
6978 contents
= s
->contents
+ 16;
6979 for (i
= 0; i
< maskwords
; ++i
)
6981 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6983 contents
+= bed
->s
->arch_size
/ 8;
6986 free (cinfo
.bitmask
);
6987 free (cinfo
.hashcodes
);
6991 s
= bfd_get_linker_section (dynobj
, ".dynstr");
6992 BFD_ASSERT (s
!= NULL
);
6994 elf_finalize_dynstr (output_bfd
, info
);
6996 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6998 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6999 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7006 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7009 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7012 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7013 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7016 /* Finish SHF_MERGE section merging. */
7019 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7024 if (!is_elf_hash_table (info
->hash
))
7027 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7028 if ((ibfd
->flags
& DYNAMIC
) == 0
7029 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7030 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7031 == get_elf_backend_data (obfd
)->s
->elfclass
))
7032 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7033 if ((sec
->flags
& SEC_MERGE
) != 0
7034 && !bfd_is_abs_section (sec
->output_section
))
7036 struct bfd_elf_section_data
*secdata
;
7038 secdata
= elf_section_data (sec
);
7039 if (! _bfd_add_merge_section (obfd
,
7040 &elf_hash_table (info
)->merge_info
,
7041 sec
, &secdata
->sec_info
))
7043 else if (secdata
->sec_info
)
7044 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7047 if (elf_hash_table (info
)->merge_info
!= NULL
)
7048 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7049 merge_sections_remove_hook
);
7053 /* Create an entry in an ELF linker hash table. */
7055 struct bfd_hash_entry
*
7056 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7057 struct bfd_hash_table
*table
,
7060 /* Allocate the structure if it has not already been allocated by a
7064 entry
= (struct bfd_hash_entry
*)
7065 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7070 /* Call the allocation method of the superclass. */
7071 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7074 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7075 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7077 /* Set local fields. */
7080 ret
->got
= htab
->init_got_refcount
;
7081 ret
->plt
= htab
->init_plt_refcount
;
7082 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7083 - offsetof (struct elf_link_hash_entry
, size
)));
7084 /* Assume that we have been called by a non-ELF symbol reader.
7085 This flag is then reset by the code which reads an ELF input
7086 file. This ensures that a symbol created by a non-ELF symbol
7087 reader will have the flag set correctly. */
7094 /* Copy data from an indirect symbol to its direct symbol, hiding the
7095 old indirect symbol. Also used for copying flags to a weakdef. */
7098 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7099 struct elf_link_hash_entry
*dir
,
7100 struct elf_link_hash_entry
*ind
)
7102 struct elf_link_hash_table
*htab
;
7104 /* Copy down any references that we may have already seen to the
7105 symbol which just became indirect if DIR isn't a hidden versioned
7108 if (dir
->versioned
!= versioned_hidden
)
7110 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7111 dir
->ref_regular
|= ind
->ref_regular
;
7112 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7113 dir
->non_got_ref
|= ind
->non_got_ref
;
7114 dir
->needs_plt
|= ind
->needs_plt
;
7115 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7118 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7121 /* Copy over the global and procedure linkage table refcount entries.
7122 These may have been already set up by a check_relocs routine. */
7123 htab
= elf_hash_table (info
);
7124 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7126 if (dir
->got
.refcount
< 0)
7127 dir
->got
.refcount
= 0;
7128 dir
->got
.refcount
+= ind
->got
.refcount
;
7129 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7132 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7134 if (dir
->plt
.refcount
< 0)
7135 dir
->plt
.refcount
= 0;
7136 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7137 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7140 if (ind
->dynindx
!= -1)
7142 if (dir
->dynindx
!= -1)
7143 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7144 dir
->dynindx
= ind
->dynindx
;
7145 dir
->dynstr_index
= ind
->dynstr_index
;
7147 ind
->dynstr_index
= 0;
7152 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7153 struct elf_link_hash_entry
*h
,
7154 bfd_boolean force_local
)
7156 /* STT_GNU_IFUNC symbol must go through PLT. */
7157 if (h
->type
!= STT_GNU_IFUNC
)
7159 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7164 h
->forced_local
= 1;
7165 if (h
->dynindx
!= -1)
7168 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7174 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7178 _bfd_elf_link_hash_table_init
7179 (struct elf_link_hash_table
*table
,
7181 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7182 struct bfd_hash_table
*,
7184 unsigned int entsize
,
7185 enum elf_target_id target_id
)
7188 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7190 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7191 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7192 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7193 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7194 /* The first dynamic symbol is a dummy. */
7195 table
->dynsymcount
= 1;
7197 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7199 table
->root
.type
= bfd_link_elf_hash_table
;
7200 table
->hash_table_id
= target_id
;
7205 /* Create an ELF linker hash table. */
7207 struct bfd_link_hash_table
*
7208 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7210 struct elf_link_hash_table
*ret
;
7211 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
7213 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7217 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7218 sizeof (struct elf_link_hash_entry
),
7224 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7229 /* Destroy an ELF linker hash table. */
7232 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7234 struct elf_link_hash_table
*htab
;
7236 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7237 if (htab
->dynstr
!= NULL
)
7238 _bfd_elf_strtab_free (htab
->dynstr
);
7239 _bfd_merge_sections_free (htab
->merge_info
);
7240 _bfd_generic_link_hash_table_free (obfd
);
7243 /* This is a hook for the ELF emulation code in the generic linker to
7244 tell the backend linker what file name to use for the DT_NEEDED
7245 entry for a dynamic object. */
7248 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7250 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7251 && bfd_get_format (abfd
) == bfd_object
)
7252 elf_dt_name (abfd
) = name
;
7256 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7259 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7260 && bfd_get_format (abfd
) == bfd_object
)
7261 lib_class
= elf_dyn_lib_class (abfd
);
7268 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7270 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7271 && bfd_get_format (abfd
) == bfd_object
)
7272 elf_dyn_lib_class (abfd
) = lib_class
;
7275 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7276 the linker ELF emulation code. */
7278 struct bfd_link_needed_list
*
7279 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7280 struct bfd_link_info
*info
)
7282 if (! is_elf_hash_table (info
->hash
))
7284 return elf_hash_table (info
)->needed
;
7287 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7288 hook for the linker ELF emulation code. */
7290 struct bfd_link_needed_list
*
7291 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7292 struct bfd_link_info
*info
)
7294 if (! is_elf_hash_table (info
->hash
))
7296 return elf_hash_table (info
)->runpath
;
7299 /* Get the name actually used for a dynamic object for a link. This
7300 is the SONAME entry if there is one. Otherwise, it is the string
7301 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7304 bfd_elf_get_dt_soname (bfd
*abfd
)
7306 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7307 && bfd_get_format (abfd
) == bfd_object
)
7308 return elf_dt_name (abfd
);
7312 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7313 the ELF linker emulation code. */
7316 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7317 struct bfd_link_needed_list
**pneeded
)
7320 bfd_byte
*dynbuf
= NULL
;
7321 unsigned int elfsec
;
7322 unsigned long shlink
;
7323 bfd_byte
*extdyn
, *extdynend
;
7325 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
7329 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
7330 || bfd_get_format (abfd
) != bfd_object
)
7333 s
= bfd_get_section_by_name (abfd
, ".dynamic");
7334 if (s
== NULL
|| s
->size
== 0)
7337 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
7340 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
7341 if (elfsec
== SHN_BAD
)
7344 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
7346 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
7347 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
7350 extdynend
= extdyn
+ s
->size
;
7351 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
7353 Elf_Internal_Dyn dyn
;
7355 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
7357 if (dyn
.d_tag
== DT_NULL
)
7360 if (dyn
.d_tag
== DT_NEEDED
)
7363 struct bfd_link_needed_list
*l
;
7364 unsigned int tagv
= dyn
.d_un
.d_val
;
7367 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
7372 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7393 struct elf_symbuf_symbol
7395 unsigned long st_name
; /* Symbol name, index in string tbl */
7396 unsigned char st_info
; /* Type and binding attributes */
7397 unsigned char st_other
; /* Visibilty, and target specific */
7400 struct elf_symbuf_head
7402 struct elf_symbuf_symbol
*ssym
;
7404 unsigned int st_shndx
;
7411 Elf_Internal_Sym
*isym
;
7412 struct elf_symbuf_symbol
*ssym
;
7417 /* Sort references to symbols by ascending section number. */
7420 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
7422 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
7423 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
7425 return s1
->st_shndx
- s2
->st_shndx
;
7429 elf_sym_name_compare (const void *arg1
, const void *arg2
)
7431 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
7432 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
7433 return strcmp (s1
->name
, s2
->name
);
7436 static struct elf_symbuf_head
*
7437 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
7439 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
7440 struct elf_symbuf_symbol
*ssym
;
7441 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
7442 size_t i
, shndx_count
, total_size
;
7444 indbuf
= (Elf_Internal_Sym
**) bfd_malloc2 (symcount
, sizeof (*indbuf
));
7448 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
7449 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
7450 *ind
++ = &isymbuf
[i
];
7453 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
7454 elf_sort_elf_symbol
);
7457 if (indbufend
> indbuf
)
7458 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
7459 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
7462 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
7463 + (indbufend
- indbuf
) * sizeof (*ssym
));
7464 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
7465 if (ssymbuf
== NULL
)
7471 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
7472 ssymbuf
->ssym
= NULL
;
7473 ssymbuf
->count
= shndx_count
;
7474 ssymbuf
->st_shndx
= 0;
7475 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
7477 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
7480 ssymhead
->ssym
= ssym
;
7481 ssymhead
->count
= 0;
7482 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
7484 ssym
->st_name
= (*ind
)->st_name
;
7485 ssym
->st_info
= (*ind
)->st_info
;
7486 ssym
->st_other
= (*ind
)->st_other
;
7489 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
7490 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
7497 /* Check if 2 sections define the same set of local and global
7501 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
7502 struct bfd_link_info
*info
)
7505 const struct elf_backend_data
*bed1
, *bed2
;
7506 Elf_Internal_Shdr
*hdr1
, *hdr2
;
7507 size_t symcount1
, symcount2
;
7508 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
7509 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
7510 Elf_Internal_Sym
*isym
, *isymend
;
7511 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
7512 size_t count1
, count2
, i
;
7513 unsigned int shndx1
, shndx2
;
7519 /* Both sections have to be in ELF. */
7520 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
7521 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
7524 if (elf_section_type (sec1
) != elf_section_type (sec2
))
7527 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
7528 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
7529 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
7532 bed1
= get_elf_backend_data (bfd1
);
7533 bed2
= get_elf_backend_data (bfd2
);
7534 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
7535 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
7536 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
7537 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
7539 if (symcount1
== 0 || symcount2
== 0)
7545 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
7546 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
7548 if (ssymbuf1
== NULL
)
7550 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
7552 if (isymbuf1
== NULL
)
7555 if (!info
->reduce_memory_overheads
)
7556 elf_tdata (bfd1
)->symbuf
= ssymbuf1
7557 = elf_create_symbuf (symcount1
, isymbuf1
);
7560 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
7562 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
7564 if (isymbuf2
== NULL
)
7567 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
7568 elf_tdata (bfd2
)->symbuf
= ssymbuf2
7569 = elf_create_symbuf (symcount2
, isymbuf2
);
7572 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7574 /* Optimized faster version. */
7576 struct elf_symbol
*symp
;
7577 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7580 hi
= ssymbuf1
->count
;
7585 mid
= (lo
+ hi
) / 2;
7586 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7588 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7592 count1
= ssymbuf1
[mid
].count
;
7599 hi
= ssymbuf2
->count
;
7604 mid
= (lo
+ hi
) / 2;
7605 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7607 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7611 count2
= ssymbuf2
[mid
].count
;
7617 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7621 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
7623 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
7624 if (symtable1
== NULL
|| symtable2
== NULL
)
7628 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7629 ssym
< ssymend
; ssym
++, symp
++)
7631 symp
->u
.ssym
= ssym
;
7632 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7638 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7639 ssym
< ssymend
; ssym
++, symp
++)
7641 symp
->u
.ssym
= ssym
;
7642 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7647 /* Sort symbol by name. */
7648 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7649 elf_sym_name_compare
);
7650 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7651 elf_sym_name_compare
);
7653 for (i
= 0; i
< count1
; i
++)
7654 /* Two symbols must have the same binding, type and name. */
7655 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7656 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7657 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7664 symtable1
= (struct elf_symbol
*)
7665 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7666 symtable2
= (struct elf_symbol
*)
7667 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7668 if (symtable1
== NULL
|| symtable2
== NULL
)
7671 /* Count definitions in the section. */
7673 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7674 if (isym
->st_shndx
== shndx1
)
7675 symtable1
[count1
++].u
.isym
= isym
;
7678 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7679 if (isym
->st_shndx
== shndx2
)
7680 symtable2
[count2
++].u
.isym
= isym
;
7682 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7685 for (i
= 0; i
< count1
; i
++)
7687 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7688 symtable1
[i
].u
.isym
->st_name
);
7690 for (i
= 0; i
< count2
; i
++)
7692 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7693 symtable2
[i
].u
.isym
->st_name
);
7695 /* Sort symbol by name. */
7696 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7697 elf_sym_name_compare
);
7698 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7699 elf_sym_name_compare
);
7701 for (i
= 0; i
< count1
; i
++)
7702 /* Two symbols must have the same binding, type and name. */
7703 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7704 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7705 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7723 /* Return TRUE if 2 section types are compatible. */
7726 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7727 bfd
*bbfd
, const asection
*bsec
)
7731 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7732 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7735 return elf_section_type (asec
) == elf_section_type (bsec
);
7738 /* Final phase of ELF linker. */
7740 /* A structure we use to avoid passing large numbers of arguments. */
7742 struct elf_final_link_info
7744 /* General link information. */
7745 struct bfd_link_info
*info
;
7748 /* Symbol string table. */
7749 struct elf_strtab_hash
*symstrtab
;
7750 /* .hash section. */
7752 /* symbol version section (.gnu.version). */
7753 asection
*symver_sec
;
7754 /* Buffer large enough to hold contents of any section. */
7756 /* Buffer large enough to hold external relocs of any section. */
7757 void *external_relocs
;
7758 /* Buffer large enough to hold internal relocs of any section. */
7759 Elf_Internal_Rela
*internal_relocs
;
7760 /* Buffer large enough to hold external local symbols of any input
7762 bfd_byte
*external_syms
;
7763 /* And a buffer for symbol section indices. */
7764 Elf_External_Sym_Shndx
*locsym_shndx
;
7765 /* Buffer large enough to hold internal local symbols of any input
7767 Elf_Internal_Sym
*internal_syms
;
7768 /* Array large enough to hold a symbol index for each local symbol
7769 of any input BFD. */
7771 /* Array large enough to hold a section pointer for each local
7772 symbol of any input BFD. */
7773 asection
**sections
;
7774 /* Buffer for SHT_SYMTAB_SHNDX section. */
7775 Elf_External_Sym_Shndx
*symshndxbuf
;
7776 /* Number of STT_FILE syms seen. */
7777 size_t filesym_count
;
7780 /* This struct is used to pass information to elf_link_output_extsym. */
7782 struct elf_outext_info
7785 bfd_boolean localsyms
;
7786 bfd_boolean file_sym_done
;
7787 struct elf_final_link_info
*flinfo
;
7791 /* Support for evaluating a complex relocation.
7793 Complex relocations are generalized, self-describing relocations. The
7794 implementation of them consists of two parts: complex symbols, and the
7795 relocations themselves.
7797 The relocations are use a reserved elf-wide relocation type code (R_RELC
7798 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7799 information (start bit, end bit, word width, etc) into the addend. This
7800 information is extracted from CGEN-generated operand tables within gas.
7802 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7803 internal) representing prefix-notation expressions, including but not
7804 limited to those sorts of expressions normally encoded as addends in the
7805 addend field. The symbol mangling format is:
7808 | <unary-operator> ':' <node>
7809 | <binary-operator> ':' <node> ':' <node>
7812 <literal> := 's' <digits=N> ':' <N character symbol name>
7813 | 'S' <digits=N> ':' <N character section name>
7817 <binary-operator> := as in C
7818 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7821 set_symbol_value (bfd
*bfd_with_globals
,
7822 Elf_Internal_Sym
*isymbuf
,
7827 struct elf_link_hash_entry
**sym_hashes
;
7828 struct elf_link_hash_entry
*h
;
7829 size_t extsymoff
= locsymcount
;
7831 if (symidx
< locsymcount
)
7833 Elf_Internal_Sym
*sym
;
7835 sym
= isymbuf
+ symidx
;
7836 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7838 /* It is a local symbol: move it to the
7839 "absolute" section and give it a value. */
7840 sym
->st_shndx
= SHN_ABS
;
7841 sym
->st_value
= val
;
7844 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7848 /* It is a global symbol: set its link type
7849 to "defined" and give it a value. */
7851 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7852 h
= sym_hashes
[symidx
- extsymoff
];
7853 while (h
->root
.type
== bfd_link_hash_indirect
7854 || h
->root
.type
== bfd_link_hash_warning
)
7855 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7856 h
->root
.type
= bfd_link_hash_defined
;
7857 h
->root
.u
.def
.value
= val
;
7858 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7862 resolve_symbol (const char *name
,
7864 struct elf_final_link_info
*flinfo
,
7866 Elf_Internal_Sym
*isymbuf
,
7869 Elf_Internal_Sym
*sym
;
7870 struct bfd_link_hash_entry
*global_entry
;
7871 const char *candidate
= NULL
;
7872 Elf_Internal_Shdr
*symtab_hdr
;
7875 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7877 for (i
= 0; i
< locsymcount
; ++ i
)
7881 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7884 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7885 symtab_hdr
->sh_link
,
7888 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7889 name
, candidate
, (unsigned long) sym
->st_value
);
7891 if (candidate
&& strcmp (candidate
, name
) == 0)
7893 asection
*sec
= flinfo
->sections
[i
];
7895 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7896 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7898 printf ("Found symbol with value %8.8lx\n",
7899 (unsigned long) *result
);
7905 /* Hmm, haven't found it yet. perhaps it is a global. */
7906 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
7907 FALSE
, FALSE
, TRUE
);
7911 if (global_entry
->type
== bfd_link_hash_defined
7912 || global_entry
->type
== bfd_link_hash_defweak
)
7914 *result
= (global_entry
->u
.def
.value
7915 + global_entry
->u
.def
.section
->output_section
->vma
7916 + global_entry
->u
.def
.section
->output_offset
);
7918 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7919 global_entry
->root
.string
, (unsigned long) *result
);
7927 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
7928 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
7929 names like "foo.end" which is the end address of section "foo". */
7932 resolve_section (const char *name
,
7940 for (curr
= sections
; curr
; curr
= curr
->next
)
7941 if (strcmp (curr
->name
, name
) == 0)
7943 *result
= curr
->vma
;
7947 /* Hmm. still haven't found it. try pseudo-section names. */
7948 /* FIXME: This could be coded more efficiently... */
7949 for (curr
= sections
; curr
; curr
= curr
->next
)
7951 len
= strlen (curr
->name
);
7952 if (len
> strlen (name
))
7955 if (strncmp (curr
->name
, name
, len
) == 0)
7957 if (strncmp (".end", name
+ len
, 4) == 0)
7959 *result
= curr
->vma
+ curr
->size
/ bfd_octets_per_byte (abfd
);
7963 /* Insert more pseudo-section names here, if you like. */
7971 undefined_reference (const char *reftype
, const char *name
)
7973 /* xgettext:c-format */
7974 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7979 eval_symbol (bfd_vma
*result
,
7982 struct elf_final_link_info
*flinfo
,
7984 Elf_Internal_Sym
*isymbuf
,
7993 const char *sym
= *symp
;
7995 bfd_boolean symbol_is_section
= FALSE
;
8000 if (len
< 1 || len
> sizeof (symbuf
))
8002 bfd_set_error (bfd_error_invalid_operation
);
8015 *result
= strtoul (sym
, (char **) symp
, 16);
8019 symbol_is_section
= TRUE
;
8023 symlen
= strtol (sym
, (char **) symp
, 10);
8024 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8026 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8028 bfd_set_error (bfd_error_invalid_operation
);
8032 memcpy (symbuf
, sym
, symlen
);
8033 symbuf
[symlen
] = '\0';
8034 *symp
= sym
+ symlen
;
8036 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8037 the symbol as a section, or vice-versa. so we're pretty liberal in our
8038 interpretation here; section means "try section first", not "must be a
8039 section", and likewise with symbol. */
8041 if (symbol_is_section
)
8043 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8044 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8045 isymbuf
, locsymcount
))
8047 undefined_reference ("section", symbuf
);
8053 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8054 isymbuf
, locsymcount
)
8055 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8058 undefined_reference ("symbol", symbuf
);
8065 /* All that remains are operators. */
8067 #define UNARY_OP(op) \
8068 if (strncmp (sym, #op, strlen (#op)) == 0) \
8070 sym += strlen (#op); \
8074 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8075 isymbuf, locsymcount, signed_p)) \
8078 *result = op ((bfd_signed_vma) a); \
8084 #define BINARY_OP(op) \
8085 if (strncmp (sym, #op, strlen (#op)) == 0) \
8087 sym += strlen (#op); \
8091 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8092 isymbuf, locsymcount, signed_p)) \
8095 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8096 isymbuf, locsymcount, signed_p)) \
8099 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8129 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8130 bfd_set_error (bfd_error_invalid_operation
);
8136 put_value (bfd_vma size
,
8137 unsigned long chunksz
,
8142 location
+= (size
- chunksz
);
8144 for (; size
; size
-= chunksz
, location
-= chunksz
)
8149 bfd_put_8 (input_bfd
, x
, location
);
8153 bfd_put_16 (input_bfd
, x
, location
);
8157 bfd_put_32 (input_bfd
, x
, location
);
8158 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8164 bfd_put_64 (input_bfd
, x
, location
);
8165 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8178 get_value (bfd_vma size
,
8179 unsigned long chunksz
,
8186 /* Sanity checks. */
8187 BFD_ASSERT (chunksz
<= sizeof (x
)
8190 && (size
% chunksz
) == 0
8191 && input_bfd
!= NULL
8192 && location
!= NULL
);
8194 if (chunksz
== sizeof (x
))
8196 BFD_ASSERT (size
== chunksz
);
8198 /* Make sure that we do not perform an undefined shift operation.
8199 We know that size == chunksz so there will only be one iteration
8200 of the loop below. */
8204 shift
= 8 * chunksz
;
8206 for (; size
; size
-= chunksz
, location
+= chunksz
)
8211 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
8214 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
8217 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
8221 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
8232 decode_complex_addend (unsigned long *start
, /* in bits */
8233 unsigned long *oplen
, /* in bits */
8234 unsigned long *len
, /* in bits */
8235 unsigned long *wordsz
, /* in bytes */
8236 unsigned long *chunksz
, /* in bytes */
8237 unsigned long *lsb0_p
,
8238 unsigned long *signed_p
,
8239 unsigned long *trunc_p
,
8240 unsigned long encoded
)
8242 * start
= encoded
& 0x3F;
8243 * len
= (encoded
>> 6) & 0x3F;
8244 * oplen
= (encoded
>> 12) & 0x3F;
8245 * wordsz
= (encoded
>> 18) & 0xF;
8246 * chunksz
= (encoded
>> 22) & 0xF;
8247 * lsb0_p
= (encoded
>> 27) & 1;
8248 * signed_p
= (encoded
>> 28) & 1;
8249 * trunc_p
= (encoded
>> 29) & 1;
8252 bfd_reloc_status_type
8253 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
8254 asection
*input_section ATTRIBUTE_UNUSED
,
8256 Elf_Internal_Rela
*rel
,
8259 bfd_vma shift
, x
, mask
;
8260 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
8261 bfd_reloc_status_type r
;
8263 /* Perform this reloc, since it is complex.
8264 (this is not to say that it necessarily refers to a complex
8265 symbol; merely that it is a self-describing CGEN based reloc.
8266 i.e. the addend has the complete reloc information (bit start, end,
8267 word size, etc) encoded within it.). */
8269 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
8270 &chunksz
, &lsb0_p
, &signed_p
,
8271 &trunc_p
, rel
->r_addend
);
8273 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
8276 shift
= (start
+ 1) - len
;
8278 shift
= (8 * wordsz
) - (start
+ len
);
8280 x
= get_value (wordsz
, chunksz
, input_bfd
,
8281 contents
+ rel
->r_offset
* bfd_octets_per_byte (input_bfd
));
8284 printf ("Doing complex reloc: "
8285 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8286 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8287 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8288 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
8289 oplen
, (unsigned long) x
, (unsigned long) mask
,
8290 (unsigned long) relocation
);
8295 /* Now do an overflow check. */
8296 r
= bfd_check_overflow ((signed_p
8297 ? complain_overflow_signed
8298 : complain_overflow_unsigned
),
8299 len
, 0, (8 * wordsz
),
8303 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
8306 printf (" relocation: %8.8lx\n"
8307 " shifted mask: %8.8lx\n"
8308 " shifted/masked reloc: %8.8lx\n"
8309 " result: %8.8lx\n",
8310 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
8311 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
8313 put_value (wordsz
, chunksz
, input_bfd
, x
,
8314 contents
+ rel
->r_offset
* bfd_octets_per_byte (input_bfd
));
8318 /* Functions to read r_offset from external (target order) reloc
8319 entry. Faster than bfd_getl32 et al, because we let the compiler
8320 know the value is aligned. */
8323 ext32l_r_offset (const void *p
)
8330 const union aligned32
*a
8331 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8333 uint32_t aval
= ( (uint32_t) a
->c
[0]
8334 | (uint32_t) a
->c
[1] << 8
8335 | (uint32_t) a
->c
[2] << 16
8336 | (uint32_t) a
->c
[3] << 24);
8341 ext32b_r_offset (const void *p
)
8348 const union aligned32
*a
8349 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8351 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
8352 | (uint32_t) a
->c
[1] << 16
8353 | (uint32_t) a
->c
[2] << 8
8354 | (uint32_t) a
->c
[3]);
8358 #ifdef BFD_HOST_64_BIT
8360 ext64l_r_offset (const void *p
)
8367 const union aligned64
*a
8368 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8370 uint64_t aval
= ( (uint64_t) a
->c
[0]
8371 | (uint64_t) a
->c
[1] << 8
8372 | (uint64_t) a
->c
[2] << 16
8373 | (uint64_t) a
->c
[3] << 24
8374 | (uint64_t) a
->c
[4] << 32
8375 | (uint64_t) a
->c
[5] << 40
8376 | (uint64_t) a
->c
[6] << 48
8377 | (uint64_t) a
->c
[7] << 56);
8382 ext64b_r_offset (const void *p
)
8389 const union aligned64
*a
8390 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8392 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
8393 | (uint64_t) a
->c
[1] << 48
8394 | (uint64_t) a
->c
[2] << 40
8395 | (uint64_t) a
->c
[3] << 32
8396 | (uint64_t) a
->c
[4] << 24
8397 | (uint64_t) a
->c
[5] << 16
8398 | (uint64_t) a
->c
[6] << 8
8399 | (uint64_t) a
->c
[7]);
8404 /* When performing a relocatable link, the input relocations are
8405 preserved. But, if they reference global symbols, the indices
8406 referenced must be updated. Update all the relocations found in
8410 elf_link_adjust_relocs (bfd
*abfd
,
8412 struct bfd_elf_section_reloc_data
*reldata
,
8416 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8418 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8419 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8420 bfd_vma r_type_mask
;
8422 unsigned int count
= reldata
->count
;
8423 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
8425 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
8427 swap_in
= bed
->s
->swap_reloc_in
;
8428 swap_out
= bed
->s
->swap_reloc_out
;
8430 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
8432 swap_in
= bed
->s
->swap_reloca_in
;
8433 swap_out
= bed
->s
->swap_reloca_out
;
8438 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
8441 if (bed
->s
->arch_size
== 32)
8448 r_type_mask
= 0xffffffff;
8452 erela
= reldata
->hdr
->contents
;
8453 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
8455 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
8458 if (*rel_hash
== NULL
)
8461 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
8463 (*swap_in
) (abfd
, erela
, irela
);
8464 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
8465 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
8466 | (irela
[j
].r_info
& r_type_mask
));
8467 (*swap_out
) (abfd
, irela
, erela
);
8470 if (bed
->elf_backend_update_relocs
)
8471 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
8473 if (sort
&& count
!= 0)
8475 bfd_vma (*ext_r_off
) (const void *);
8478 bfd_byte
*base
, *end
, *p
, *loc
;
8479 bfd_byte
*buf
= NULL
;
8481 if (bed
->s
->arch_size
== 32)
8483 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
8484 ext_r_off
= ext32l_r_offset
;
8485 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
8486 ext_r_off
= ext32b_r_offset
;
8492 #ifdef BFD_HOST_64_BIT
8493 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
8494 ext_r_off
= ext64l_r_offset
;
8495 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
8496 ext_r_off
= ext64b_r_offset
;
8502 /* Must use a stable sort here. A modified insertion sort,
8503 since the relocs are mostly sorted already. */
8504 elt_size
= reldata
->hdr
->sh_entsize
;
8505 base
= reldata
->hdr
->contents
;
8506 end
= base
+ count
* elt_size
;
8507 if (elt_size
> sizeof (Elf64_External_Rela
))
8510 /* Ensure the first element is lowest. This acts as a sentinel,
8511 speeding the main loop below. */
8512 r_off
= (*ext_r_off
) (base
);
8513 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
8515 bfd_vma r_off2
= (*ext_r_off
) (p
);
8524 /* Don't just swap *base and *loc as that changes the order
8525 of the original base[0] and base[1] if they happen to
8526 have the same r_offset. */
8527 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
8528 memcpy (onebuf
, loc
, elt_size
);
8529 memmove (base
+ elt_size
, base
, loc
- base
);
8530 memcpy (base
, onebuf
, elt_size
);
8533 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
8535 /* base to p is sorted, *p is next to insert. */
8536 r_off
= (*ext_r_off
) (p
);
8537 /* Search the sorted region for location to insert. */
8539 while (r_off
< (*ext_r_off
) (loc
))
8544 /* Chances are there is a run of relocs to insert here,
8545 from one of more input files. Files are not always
8546 linked in order due to the way elf_link_input_bfd is
8547 called. See pr17666. */
8548 size_t sortlen
= p
- loc
;
8549 bfd_vma r_off2
= (*ext_r_off
) (loc
);
8550 size_t runlen
= elt_size
;
8551 size_t buf_size
= 96 * 1024;
8552 while (p
+ runlen
< end
8553 && (sortlen
<= buf_size
8554 || runlen
+ elt_size
<= buf_size
)
8555 && r_off2
> (*ext_r_off
) (p
+ runlen
))
8559 buf
= bfd_malloc (buf_size
);
8563 if (runlen
< sortlen
)
8565 memcpy (buf
, p
, runlen
);
8566 memmove (loc
+ runlen
, loc
, sortlen
);
8567 memcpy (loc
, buf
, runlen
);
8571 memcpy (buf
, loc
, sortlen
);
8572 memmove (loc
, p
, runlen
);
8573 memcpy (loc
+ runlen
, buf
, sortlen
);
8575 p
+= runlen
- elt_size
;
8578 /* Hashes are no longer valid. */
8579 free (reldata
->hashes
);
8580 reldata
->hashes
= NULL
;
8586 struct elf_link_sort_rela
8592 enum elf_reloc_type_class type
;
8593 /* We use this as an array of size int_rels_per_ext_rel. */
8594 Elf_Internal_Rela rela
[1];
8598 elf_link_sort_cmp1 (const void *A
, const void *B
)
8600 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
8601 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8602 int relativea
, relativeb
;
8604 relativea
= a
->type
== reloc_class_relative
;
8605 relativeb
= b
->type
== reloc_class_relative
;
8607 if (relativea
< relativeb
)
8609 if (relativea
> relativeb
)
8611 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
8613 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
8615 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8617 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8623 elf_link_sort_cmp2 (const void *A
, const void *B
)
8625 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
8626 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8628 if (a
->type
< b
->type
)
8630 if (a
->type
> b
->type
)
8632 if (a
->u
.offset
< b
->u
.offset
)
8634 if (a
->u
.offset
> b
->u
.offset
)
8636 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8638 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8644 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
8646 asection
*dynamic_relocs
;
8649 bfd_size_type count
, size
;
8650 size_t i
, ret
, sort_elt
, ext_size
;
8651 bfd_byte
*sort
, *s_non_relative
, *p
;
8652 struct elf_link_sort_rela
*sq
;
8653 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8654 int i2e
= bed
->s
->int_rels_per_ext_rel
;
8655 unsigned int opb
= bfd_octets_per_byte (abfd
);
8656 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8657 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8658 struct bfd_link_order
*lo
;
8660 bfd_boolean use_rela
;
8662 /* Find a dynamic reloc section. */
8663 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
8664 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
8665 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
8666 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8668 bfd_boolean use_rela_initialised
= FALSE
;
8670 /* This is just here to stop gcc from complaining.
8671 Its initialization checking code is not perfect. */
8674 /* Both sections are present. Examine the sizes
8675 of the indirect sections to help us choose. */
8676 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8677 if (lo
->type
== bfd_indirect_link_order
)
8679 asection
*o
= lo
->u
.indirect
.section
;
8681 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8683 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8684 /* Section size is divisible by both rel and rela sizes.
8685 It is of no help to us. */
8689 /* Section size is only divisible by rela. */
8690 if (use_rela_initialised
&& (use_rela
== FALSE
))
8692 _bfd_error_handler (_("%B: Unable to sort relocs - "
8693 "they are in more than one size"),
8695 bfd_set_error (bfd_error_invalid_operation
);
8701 use_rela_initialised
= TRUE
;
8705 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8707 /* Section size is only divisible by rel. */
8708 if (use_rela_initialised
&& (use_rela
== TRUE
))
8710 _bfd_error_handler (_("%B: Unable to sort relocs - "
8711 "they are in more than one size"),
8713 bfd_set_error (bfd_error_invalid_operation
);
8719 use_rela_initialised
= TRUE
;
8724 /* The section size is not divisible by either -
8725 something is wrong. */
8726 _bfd_error_handler (_("%B: Unable to sort relocs - "
8727 "they are of an unknown size"), abfd
);
8728 bfd_set_error (bfd_error_invalid_operation
);
8733 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8734 if (lo
->type
== bfd_indirect_link_order
)
8736 asection
*o
= lo
->u
.indirect
.section
;
8738 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8740 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8741 /* Section size is divisible by both rel and rela sizes.
8742 It is of no help to us. */
8746 /* Section size is only divisible by rela. */
8747 if (use_rela_initialised
&& (use_rela
== FALSE
))
8749 _bfd_error_handler (_("%B: Unable to sort relocs - "
8750 "they are in more than one size"),
8752 bfd_set_error (bfd_error_invalid_operation
);
8758 use_rela_initialised
= TRUE
;
8762 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8764 /* Section size is only divisible by rel. */
8765 if (use_rela_initialised
&& (use_rela
== TRUE
))
8767 _bfd_error_handler (_("%B: Unable to sort relocs - "
8768 "they are in more than one size"),
8770 bfd_set_error (bfd_error_invalid_operation
);
8776 use_rela_initialised
= TRUE
;
8781 /* The section size is not divisible by either -
8782 something is wrong. */
8783 _bfd_error_handler (_("%B: Unable to sort relocs - "
8784 "they are of an unknown size"), abfd
);
8785 bfd_set_error (bfd_error_invalid_operation
);
8790 if (! use_rela_initialised
)
8794 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
8796 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8803 dynamic_relocs
= rela_dyn
;
8804 ext_size
= bed
->s
->sizeof_rela
;
8805 swap_in
= bed
->s
->swap_reloca_in
;
8806 swap_out
= bed
->s
->swap_reloca_out
;
8810 dynamic_relocs
= rel_dyn
;
8811 ext_size
= bed
->s
->sizeof_rel
;
8812 swap_in
= bed
->s
->swap_reloc_in
;
8813 swap_out
= bed
->s
->swap_reloc_out
;
8817 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8818 if (lo
->type
== bfd_indirect_link_order
)
8819 size
+= lo
->u
.indirect
.section
->size
;
8821 if (size
!= dynamic_relocs
->size
)
8824 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8825 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8827 count
= dynamic_relocs
->size
/ ext_size
;
8830 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
8834 (*info
->callbacks
->warning
)
8835 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8839 if (bed
->s
->arch_size
== 32)
8840 r_sym_mask
= ~(bfd_vma
) 0xff;
8842 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8844 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8845 if (lo
->type
== bfd_indirect_link_order
)
8847 bfd_byte
*erel
, *erelend
;
8848 asection
*o
= lo
->u
.indirect
.section
;
8850 if (o
->contents
== NULL
&& o
->size
!= 0)
8852 /* This is a reloc section that is being handled as a normal
8853 section. See bfd_section_from_shdr. We can't combine
8854 relocs in this case. */
8859 erelend
= o
->contents
+ o
->size
;
8860 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
8862 while (erel
< erelend
)
8864 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8866 (*swap_in
) (abfd
, erel
, s
->rela
);
8867 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
8868 s
->u
.sym_mask
= r_sym_mask
;
8874 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8876 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8878 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8879 if (s
->type
!= reloc_class_relative
)
8885 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8886 for (; i
< count
; i
++, p
+= sort_elt
)
8888 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8889 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8891 sp
->u
.offset
= sq
->rela
->r_offset
;
8894 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8896 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
8897 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
8899 /* We have plt relocs in .rela.dyn. */
8900 sq
= (struct elf_link_sort_rela
*) sort
;
8901 for (i
= 0; i
< count
; i
++)
8902 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
8904 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
8906 struct bfd_link_order
**plo
;
8907 /* Put srelplt link_order last. This is so the output_offset
8908 set in the next loop is correct for DT_JMPREL. */
8909 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
8910 if ((*plo
)->type
== bfd_indirect_link_order
8911 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
8917 plo
= &(*plo
)->next
;
8920 dynamic_relocs
->map_tail
.link_order
= lo
;
8925 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8926 if (lo
->type
== bfd_indirect_link_order
)
8928 bfd_byte
*erel
, *erelend
;
8929 asection
*o
= lo
->u
.indirect
.section
;
8932 erelend
= o
->contents
+ o
->size
;
8933 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
8934 while (erel
< erelend
)
8936 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8937 (*swap_out
) (abfd
, s
->rela
, erel
);
8944 *psec
= dynamic_relocs
;
8948 /* Add a symbol to the output symbol string table. */
8951 elf_link_output_symstrtab (struct elf_final_link_info
*flinfo
,
8953 Elf_Internal_Sym
*elfsym
,
8954 asection
*input_sec
,
8955 struct elf_link_hash_entry
*h
)
8957 int (*output_symbol_hook
)
8958 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8959 struct elf_link_hash_entry
*);
8960 struct elf_link_hash_table
*hash_table
;
8961 const struct elf_backend_data
*bed
;
8962 bfd_size_type strtabsize
;
8964 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
8966 bed
= get_elf_backend_data (flinfo
->output_bfd
);
8967 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8968 if (output_symbol_hook
!= NULL
)
8970 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
8977 || (input_sec
->flags
& SEC_EXCLUDE
))
8978 elfsym
->st_name
= (unsigned long) -1;
8981 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
8982 to get the final offset for st_name. */
8984 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
8986 if (elfsym
->st_name
== (unsigned long) -1)
8990 hash_table
= elf_hash_table (flinfo
->info
);
8991 strtabsize
= hash_table
->strtabsize
;
8992 if (strtabsize
<= hash_table
->strtabcount
)
8994 strtabsize
+= strtabsize
;
8995 hash_table
->strtabsize
= strtabsize
;
8996 strtabsize
*= sizeof (*hash_table
->strtab
);
8998 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9000 if (hash_table
->strtab
== NULL
)
9003 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9004 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9005 = hash_table
->strtabcount
;
9006 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9007 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9009 bfd_get_symcount (flinfo
->output_bfd
) += 1;
9010 hash_table
->strtabcount
+= 1;
9015 /* Swap symbols out to the symbol table and flush the output symbols to
9019 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9021 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9024 const struct elf_backend_data
*bed
;
9026 Elf_Internal_Shdr
*hdr
;
9030 if (!hash_table
->strtabcount
)
9033 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9035 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9037 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9038 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9042 if (flinfo
->symshndxbuf
)
9044 amt
= sizeof (Elf_External_Sym_Shndx
);
9045 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9046 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9047 if (flinfo
->symshndxbuf
== NULL
)
9054 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9056 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9057 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9058 elfsym
->sym
.st_name
= 0;
9061 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9062 elfsym
->sym
.st_name
);
9063 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9064 ((bfd_byte
*) symbuf
9065 + (elfsym
->dest_index
9066 * bed
->s
->sizeof_sym
)),
9067 (flinfo
->symshndxbuf
9068 + elfsym
->destshndx_index
));
9071 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9072 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9073 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9074 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9075 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9077 hdr
->sh_size
+= amt
;
9085 free (hash_table
->strtab
);
9086 hash_table
->strtab
= NULL
;
9091 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9094 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9096 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9097 && sym
->st_shndx
< SHN_LORESERVE
)
9099 /* The gABI doesn't support dynamic symbols in output sections
9102 /* xgettext:c-format */
9103 (_("%B: Too many sections: %d (>= %d)"),
9104 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9105 bfd_set_error (bfd_error_nonrepresentable_section
);
9111 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9112 allowing an unsatisfied unversioned symbol in the DSO to match a
9113 versioned symbol that would normally require an explicit version.
9114 We also handle the case that a DSO references a hidden symbol
9115 which may be satisfied by a versioned symbol in another DSO. */
9118 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
9119 const struct elf_backend_data
*bed
,
9120 struct elf_link_hash_entry
*h
)
9123 struct elf_link_loaded_list
*loaded
;
9125 if (!is_elf_hash_table (info
->hash
))
9128 /* Check indirect symbol. */
9129 while (h
->root
.type
== bfd_link_hash_indirect
)
9130 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9132 switch (h
->root
.type
)
9138 case bfd_link_hash_undefined
:
9139 case bfd_link_hash_undefweak
:
9140 abfd
= h
->root
.u
.undef
.abfd
;
9142 || (abfd
->flags
& DYNAMIC
) == 0
9143 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
9147 case bfd_link_hash_defined
:
9148 case bfd_link_hash_defweak
:
9149 abfd
= h
->root
.u
.def
.section
->owner
;
9152 case bfd_link_hash_common
:
9153 abfd
= h
->root
.u
.c
.p
->section
->owner
;
9156 BFD_ASSERT (abfd
!= NULL
);
9158 for (loaded
= elf_hash_table (info
)->loaded
;
9160 loaded
= loaded
->next
)
9163 Elf_Internal_Shdr
*hdr
;
9167 Elf_Internal_Shdr
*versymhdr
;
9168 Elf_Internal_Sym
*isym
;
9169 Elf_Internal_Sym
*isymend
;
9170 Elf_Internal_Sym
*isymbuf
;
9171 Elf_External_Versym
*ever
;
9172 Elf_External_Versym
*extversym
;
9174 input
= loaded
->abfd
;
9176 /* We check each DSO for a possible hidden versioned definition. */
9178 || (input
->flags
& DYNAMIC
) == 0
9179 || elf_dynversym (input
) == 0)
9182 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
9184 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9185 if (elf_bad_symtab (input
))
9187 extsymcount
= symcount
;
9192 extsymcount
= symcount
- hdr
->sh_info
;
9193 extsymoff
= hdr
->sh_info
;
9196 if (extsymcount
== 0)
9199 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
9201 if (isymbuf
== NULL
)
9204 /* Read in any version definitions. */
9205 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
9206 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
9207 if (extversym
== NULL
)
9210 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
9211 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
9212 != versymhdr
->sh_size
))
9220 ever
= extversym
+ extsymoff
;
9221 isymend
= isymbuf
+ extsymcount
;
9222 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
9225 Elf_Internal_Versym iver
;
9226 unsigned short version_index
;
9228 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
9229 || isym
->st_shndx
== SHN_UNDEF
)
9232 name
= bfd_elf_string_from_elf_section (input
,
9235 if (strcmp (name
, h
->root
.root
.string
) != 0)
9238 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
9240 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
9242 && h
->forced_local
))
9244 /* If we have a non-hidden versioned sym, then it should
9245 have provided a definition for the undefined sym unless
9246 it is defined in a non-shared object and forced local.
9251 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
9252 if (version_index
== 1 || version_index
== 2)
9254 /* This is the base or first version. We can use it. */
9268 /* Convert ELF common symbol TYPE. */
9271 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
9273 /* Commom symbol can only appear in relocatable link. */
9274 if (!bfd_link_relocatable (info
))
9276 switch (info
->elf_stt_common
)
9280 case elf_stt_common
:
9283 case no_elf_stt_common
:
9290 /* Add an external symbol to the symbol table. This is called from
9291 the hash table traversal routine. When generating a shared object,
9292 we go through the symbol table twice. The first time we output
9293 anything that might have been forced to local scope in a version
9294 script. The second time we output the symbols that are still
9298 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
9300 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
9301 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
9302 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
9304 Elf_Internal_Sym sym
;
9305 asection
*input_sec
;
9306 const struct elf_backend_data
*bed
;
9311 if (h
->root
.type
== bfd_link_hash_warning
)
9313 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9314 if (h
->root
.type
== bfd_link_hash_new
)
9318 /* Decide whether to output this symbol in this pass. */
9319 if (eoinfo
->localsyms
)
9321 if (!h
->forced_local
)
9326 if (h
->forced_local
)
9330 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9332 if (h
->root
.type
== bfd_link_hash_undefined
)
9334 /* If we have an undefined symbol reference here then it must have
9335 come from a shared library that is being linked in. (Undefined
9336 references in regular files have already been handled unless
9337 they are in unreferenced sections which are removed by garbage
9339 bfd_boolean ignore_undef
= FALSE
;
9341 /* Some symbols may be special in that the fact that they're
9342 undefined can be safely ignored - let backend determine that. */
9343 if (bed
->elf_backend_ignore_undef_symbol
)
9344 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
9346 /* If we are reporting errors for this situation then do so now. */
9349 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
9350 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
9351 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
9352 (*flinfo
->info
->callbacks
->undefined_symbol
)
9353 (flinfo
->info
, h
->root
.root
.string
,
9354 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
,
9356 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
);
9358 /* Strip a global symbol defined in a discarded section. */
9363 /* We should also warn if a forced local symbol is referenced from
9364 shared libraries. */
9365 if (bfd_link_executable (flinfo
->info
)
9370 && h
->ref_dynamic_nonweak
9371 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
9375 struct elf_link_hash_entry
*hi
= h
;
9377 /* Check indirect symbol. */
9378 while (hi
->root
.type
== bfd_link_hash_indirect
)
9379 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
9381 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
9382 /* xgettext:c-format */
9383 msg
= _("%B: internal symbol `%s' in %B is referenced by DSO");
9384 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
9385 /* xgettext:c-format */
9386 msg
= _("%B: hidden symbol `%s' in %B is referenced by DSO");
9388 /* xgettext:c-format */
9389 msg
= _("%B: local symbol `%s' in %B is referenced by DSO");
9390 def_bfd
= flinfo
->output_bfd
;
9391 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
9392 def_bfd
= hi
->root
.u
.def
.section
->owner
;
9393 _bfd_error_handler (msg
, flinfo
->output_bfd
, def_bfd
,
9394 h
->root
.root
.string
);
9395 bfd_set_error (bfd_error_bad_value
);
9396 eoinfo
->failed
= TRUE
;
9400 /* We don't want to output symbols that have never been mentioned by
9401 a regular file, or that we have been told to strip. However, if
9402 h->indx is set to -2, the symbol is used by a reloc and we must
9407 else if ((h
->def_dynamic
9409 || h
->root
.type
== bfd_link_hash_new
)
9413 else if (flinfo
->info
->strip
== strip_all
)
9415 else if (flinfo
->info
->strip
== strip_some
9416 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
9417 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
9419 else if ((h
->root
.type
== bfd_link_hash_defined
9420 || h
->root
.type
== bfd_link_hash_defweak
)
9421 && ((flinfo
->info
->strip_discarded
9422 && discarded_section (h
->root
.u
.def
.section
))
9423 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
9424 && h
->root
.u
.def
.section
->owner
!= NULL
9425 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
9427 else if ((h
->root
.type
== bfd_link_hash_undefined
9428 || h
->root
.type
== bfd_link_hash_undefweak
)
9429 && h
->root
.u
.undef
.abfd
!= NULL
9430 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
9435 /* If we're stripping it, and it's not a dynamic symbol, there's
9436 nothing else to do. However, if it is a forced local symbol or
9437 an ifunc symbol we need to give the backend finish_dynamic_symbol
9438 function a chance to make it dynamic. */
9441 && type
!= STT_GNU_IFUNC
9442 && !h
->forced_local
)
9446 sym
.st_size
= h
->size
;
9447 sym
.st_other
= h
->other
;
9448 switch (h
->root
.type
)
9451 case bfd_link_hash_new
:
9452 case bfd_link_hash_warning
:
9456 case bfd_link_hash_undefined
:
9457 case bfd_link_hash_undefweak
:
9458 input_sec
= bfd_und_section_ptr
;
9459 sym
.st_shndx
= SHN_UNDEF
;
9462 case bfd_link_hash_defined
:
9463 case bfd_link_hash_defweak
:
9465 input_sec
= h
->root
.u
.def
.section
;
9466 if (input_sec
->output_section
!= NULL
)
9469 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
9470 input_sec
->output_section
);
9471 if (sym
.st_shndx
== SHN_BAD
)
9474 /* xgettext:c-format */
9475 (_("%B: could not find output section %A for input section %A"),
9476 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
9477 bfd_set_error (bfd_error_nonrepresentable_section
);
9478 eoinfo
->failed
= TRUE
;
9482 /* ELF symbols in relocatable files are section relative,
9483 but in nonrelocatable files they are virtual
9485 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
9486 if (!bfd_link_relocatable (flinfo
->info
))
9488 sym
.st_value
+= input_sec
->output_section
->vma
;
9489 if (h
->type
== STT_TLS
)
9491 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
9492 if (tls_sec
!= NULL
)
9493 sym
.st_value
-= tls_sec
->vma
;
9499 BFD_ASSERT (input_sec
->owner
== NULL
9500 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
9501 sym
.st_shndx
= SHN_UNDEF
;
9502 input_sec
= bfd_und_section_ptr
;
9507 case bfd_link_hash_common
:
9508 input_sec
= h
->root
.u
.c
.p
->section
;
9509 sym
.st_shndx
= bed
->common_section_index (input_sec
);
9510 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
9513 case bfd_link_hash_indirect
:
9514 /* These symbols are created by symbol versioning. They point
9515 to the decorated version of the name. For example, if the
9516 symbol foo@@GNU_1.2 is the default, which should be used when
9517 foo is used with no version, then we add an indirect symbol
9518 foo which points to foo@@GNU_1.2. We ignore these symbols,
9519 since the indirected symbol is already in the hash table. */
9523 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
9524 switch (h
->root
.type
)
9526 case bfd_link_hash_common
:
9527 type
= elf_link_convert_common_type (flinfo
->info
, type
);
9529 case bfd_link_hash_defined
:
9530 case bfd_link_hash_defweak
:
9531 if (bed
->common_definition (&sym
))
9532 type
= elf_link_convert_common_type (flinfo
->info
, type
);
9536 case bfd_link_hash_undefined
:
9537 case bfd_link_hash_undefweak
:
9543 if (h
->forced_local
)
9545 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
9546 /* Turn off visibility on local symbol. */
9547 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
9549 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
9550 else if (h
->unique_global
&& h
->def_regular
)
9551 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
9552 else if (h
->root
.type
== bfd_link_hash_undefweak
9553 || h
->root
.type
== bfd_link_hash_defweak
)
9554 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
9556 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
9557 sym
.st_target_internal
= h
->target_internal
;
9559 /* Give the processor backend a chance to tweak the symbol value,
9560 and also to finish up anything that needs to be done for this
9561 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9562 forced local syms when non-shared is due to a historical quirk.
9563 STT_GNU_IFUNC symbol must go through PLT. */
9564 if ((h
->type
== STT_GNU_IFUNC
9566 && !bfd_link_relocatable (flinfo
->info
))
9567 || ((h
->dynindx
!= -1
9569 && ((bfd_link_pic (flinfo
->info
)
9570 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
9571 || h
->root
.type
!= bfd_link_hash_undefweak
))
9572 || !h
->forced_local
)
9573 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
9575 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
9576 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
9578 eoinfo
->failed
= TRUE
;
9583 /* If we are marking the symbol as undefined, and there are no
9584 non-weak references to this symbol from a regular object, then
9585 mark the symbol as weak undefined; if there are non-weak
9586 references, mark the symbol as strong. We can't do this earlier,
9587 because it might not be marked as undefined until the
9588 finish_dynamic_symbol routine gets through with it. */
9589 if (sym
.st_shndx
== SHN_UNDEF
9591 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
9592 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
9595 type
= ELF_ST_TYPE (sym
.st_info
);
9597 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9598 if (type
== STT_GNU_IFUNC
)
9601 if (h
->ref_regular_nonweak
)
9602 bindtype
= STB_GLOBAL
;
9604 bindtype
= STB_WEAK
;
9605 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
9608 /* If this is a symbol defined in a dynamic library, don't use the
9609 symbol size from the dynamic library. Relinking an executable
9610 against a new library may introduce gratuitous changes in the
9611 executable's symbols if we keep the size. */
9612 if (sym
.st_shndx
== SHN_UNDEF
9617 /* If a non-weak symbol with non-default visibility is not defined
9618 locally, it is a fatal error. */
9619 if (!bfd_link_relocatable (flinfo
->info
)
9620 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
9621 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
9622 && h
->root
.type
== bfd_link_hash_undefined
9627 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
9628 /* xgettext:c-format */
9629 msg
= _("%B: protected symbol `%s' isn't defined");
9630 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
9631 /* xgettext:c-format */
9632 msg
= _("%B: internal symbol `%s' isn't defined");
9634 /* xgettext:c-format */
9635 msg
= _("%B: hidden symbol `%s' isn't defined");
9636 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
9637 bfd_set_error (bfd_error_bad_value
);
9638 eoinfo
->failed
= TRUE
;
9642 /* If this symbol should be put in the .dynsym section, then put it
9643 there now. We already know the symbol index. We also fill in
9644 the entry in the .hash section. */
9645 if (elf_hash_table (flinfo
->info
)->dynsym
!= NULL
9647 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
)
9651 /* Since there is no version information in the dynamic string,
9652 if there is no version info in symbol version section, we will
9653 have a run-time problem if not linking executable, referenced
9654 by shared library, or not bound locally. */
9655 if (h
->verinfo
.verdef
== NULL
9656 && (!bfd_link_executable (flinfo
->info
)
9658 || !h
->def_regular
))
9660 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
9662 if (p
&& p
[1] != '\0')
9665 /* xgettext:c-format */
9666 (_("%B: No symbol version section for versioned symbol `%s'"),
9667 flinfo
->output_bfd
, h
->root
.root
.string
);
9668 eoinfo
->failed
= TRUE
;
9673 sym
.st_name
= h
->dynstr_index
;
9674 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
9675 + h
->dynindx
* bed
->s
->sizeof_sym
);
9676 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
9678 eoinfo
->failed
= TRUE
;
9681 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
9683 if (flinfo
->hash_sec
!= NULL
)
9685 size_t hash_entry_size
;
9686 bfd_byte
*bucketpos
;
9691 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
9692 bucket
= h
->u
.elf_hash_value
% bucketcount
;
9695 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
9696 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
9697 + (bucket
+ 2) * hash_entry_size
);
9698 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
9699 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
9701 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
9702 ((bfd_byte
*) flinfo
->hash_sec
->contents
9703 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
9706 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
9708 Elf_Internal_Versym iversym
;
9709 Elf_External_Versym
*eversym
;
9711 if (!h
->def_regular
)
9713 if (h
->verinfo
.verdef
== NULL
9714 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
9715 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
9716 iversym
.vs_vers
= 0;
9718 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
9722 if (h
->verinfo
.vertree
== NULL
)
9723 iversym
.vs_vers
= 1;
9725 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
9726 if (flinfo
->info
->create_default_symver
)
9730 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
9732 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
9733 iversym
.vs_vers
|= VERSYM_HIDDEN
;
9735 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
9736 eversym
+= h
->dynindx
;
9737 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
9741 /* If the symbol is undefined, and we didn't output it to .dynsym,
9742 strip it from .symtab too. Obviously we can't do this for
9743 relocatable output or when needed for --emit-relocs. */
9744 else if (input_sec
== bfd_und_section_ptr
9746 && !bfd_link_relocatable (flinfo
->info
))
9748 /* Also strip others that we couldn't earlier due to dynamic symbol
9752 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
9755 /* Output a FILE symbol so that following locals are not associated
9756 with the wrong input file. We need one for forced local symbols
9757 if we've seen more than one FILE symbol or when we have exactly
9758 one FILE symbol but global symbols are present in a file other
9759 than the one with the FILE symbol. We also need one if linker
9760 defined symbols are present. In practice these conditions are
9761 always met, so just emit the FILE symbol unconditionally. */
9762 if (eoinfo
->localsyms
9763 && !eoinfo
->file_sym_done
9764 && eoinfo
->flinfo
->filesym_count
!= 0)
9766 Elf_Internal_Sym fsym
;
9768 memset (&fsym
, 0, sizeof (fsym
));
9769 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
9770 fsym
.st_shndx
= SHN_ABS
;
9771 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
9772 bfd_und_section_ptr
, NULL
))
9775 eoinfo
->file_sym_done
= TRUE
;
9778 indx
= bfd_get_symcount (flinfo
->output_bfd
);
9779 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
9783 eoinfo
->failed
= TRUE
;
9788 else if (h
->indx
== -2)
9794 /* Return TRUE if special handling is done for relocs in SEC against
9795 symbols defined in discarded sections. */
9798 elf_section_ignore_discarded_relocs (asection
*sec
)
9800 const struct elf_backend_data
*bed
;
9802 switch (sec
->sec_info_type
)
9804 case SEC_INFO_TYPE_STABS
:
9805 case SEC_INFO_TYPE_EH_FRAME
:
9806 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
9812 bed
= get_elf_backend_data (sec
->owner
);
9813 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
9814 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
9820 /* Return a mask saying how ld should treat relocations in SEC against
9821 symbols defined in discarded sections. If this function returns
9822 COMPLAIN set, ld will issue a warning message. If this function
9823 returns PRETEND set, and the discarded section was link-once and the
9824 same size as the kept link-once section, ld will pretend that the
9825 symbol was actually defined in the kept section. Otherwise ld will
9826 zero the reloc (at least that is the intent, but some cooperation by
9827 the target dependent code is needed, particularly for REL targets). */
9830 _bfd_elf_default_action_discarded (asection
*sec
)
9832 if (sec
->flags
& SEC_DEBUGGING
)
9835 if (strcmp (".eh_frame", sec
->name
) == 0)
9838 if (strcmp (".gcc_except_table", sec
->name
) == 0)
9841 return COMPLAIN
| PRETEND
;
9844 /* Find a match between a section and a member of a section group. */
9847 match_group_member (asection
*sec
, asection
*group
,
9848 struct bfd_link_info
*info
)
9850 asection
*first
= elf_next_in_group (group
);
9851 asection
*s
= first
;
9855 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
9858 s
= elf_next_in_group (s
);
9866 /* Check if the kept section of a discarded section SEC can be used
9867 to replace it. Return the replacement if it is OK. Otherwise return
9871 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
9875 kept
= sec
->kept_section
;
9878 if ((kept
->flags
& SEC_GROUP
) != 0)
9879 kept
= match_group_member (sec
, kept
, info
);
9881 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
9882 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
9884 sec
->kept_section
= kept
;
9889 /* Link an input file into the linker output file. This function
9890 handles all the sections and relocations of the input file at once.
9891 This is so that we only have to read the local symbols once, and
9892 don't have to keep them in memory. */
9895 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
9897 int (*relocate_section
)
9898 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
9899 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
9901 Elf_Internal_Shdr
*symtab_hdr
;
9904 Elf_Internal_Sym
*isymbuf
;
9905 Elf_Internal_Sym
*isym
;
9906 Elf_Internal_Sym
*isymend
;
9908 asection
**ppsection
;
9910 const struct elf_backend_data
*bed
;
9911 struct elf_link_hash_entry
**sym_hashes
;
9912 bfd_size_type address_size
;
9913 bfd_vma r_type_mask
;
9915 bfd_boolean have_file_sym
= FALSE
;
9917 output_bfd
= flinfo
->output_bfd
;
9918 bed
= get_elf_backend_data (output_bfd
);
9919 relocate_section
= bed
->elf_backend_relocate_section
;
9921 /* If this is a dynamic object, we don't want to do anything here:
9922 we don't want the local symbols, and we don't want the section
9924 if ((input_bfd
->flags
& DYNAMIC
) != 0)
9927 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
9928 if (elf_bad_symtab (input_bfd
))
9930 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9935 locsymcount
= symtab_hdr
->sh_info
;
9936 extsymoff
= symtab_hdr
->sh_info
;
9939 /* Read the local symbols. */
9940 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9941 if (isymbuf
== NULL
&& locsymcount
!= 0)
9943 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
9944 flinfo
->internal_syms
,
9945 flinfo
->external_syms
,
9946 flinfo
->locsym_shndx
);
9947 if (isymbuf
== NULL
)
9951 /* Find local symbol sections and adjust values of symbols in
9952 SEC_MERGE sections. Write out those local symbols we know are
9953 going into the output file. */
9954 isymend
= isymbuf
+ locsymcount
;
9955 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
9957 isym
++, pindex
++, ppsection
++)
9961 Elf_Internal_Sym osym
;
9967 if (elf_bad_symtab (input_bfd
))
9969 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
9976 if (isym
->st_shndx
== SHN_UNDEF
)
9977 isec
= bfd_und_section_ptr
;
9978 else if (isym
->st_shndx
== SHN_ABS
)
9979 isec
= bfd_abs_section_ptr
;
9980 else if (isym
->st_shndx
== SHN_COMMON
)
9981 isec
= bfd_com_section_ptr
;
9984 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
9987 /* Don't attempt to output symbols with st_shnx in the
9988 reserved range other than SHN_ABS and SHN_COMMON. */
9992 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
9993 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
9995 _bfd_merged_section_offset (output_bfd
, &isec
,
9996 elf_section_data (isec
)->sec_info
,
10002 /* Don't output the first, undefined, symbol. In fact, don't
10003 output any undefined local symbol. */
10004 if (isec
== bfd_und_section_ptr
)
10007 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10009 /* We never output section symbols. Instead, we use the
10010 section symbol of the corresponding section in the output
10015 /* If we are stripping all symbols, we don't want to output this
10017 if (flinfo
->info
->strip
== strip_all
)
10020 /* If we are discarding all local symbols, we don't want to
10021 output this one. If we are generating a relocatable output
10022 file, then some of the local symbols may be required by
10023 relocs; we output them below as we discover that they are
10025 if (flinfo
->info
->discard
== discard_all
)
10028 /* If this symbol is defined in a section which we are
10029 discarding, we don't need to keep it. */
10030 if (isym
->st_shndx
!= SHN_UNDEF
10031 && isym
->st_shndx
< SHN_LORESERVE
10032 && bfd_section_removed_from_list (output_bfd
,
10033 isec
->output_section
))
10036 /* Get the name of the symbol. */
10037 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10042 /* See if we are discarding symbols with this name. */
10043 if ((flinfo
->info
->strip
== strip_some
10044 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
10046 || (((flinfo
->info
->discard
== discard_sec_merge
10047 && (isec
->flags
& SEC_MERGE
)
10048 && !bfd_link_relocatable (flinfo
->info
))
10049 || flinfo
->info
->discard
== discard_l
)
10050 && bfd_is_local_label_name (input_bfd
, name
)))
10053 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10055 if (input_bfd
->lto_output
)
10056 /* -flto puts a temp file name here. This means builds
10057 are not reproducible. Discard the symbol. */
10059 have_file_sym
= TRUE
;
10060 flinfo
->filesym_count
+= 1;
10062 if (!have_file_sym
)
10064 /* In the absence of debug info, bfd_find_nearest_line uses
10065 FILE symbols to determine the source file for local
10066 function symbols. Provide a FILE symbol here if input
10067 files lack such, so that their symbols won't be
10068 associated with a previous input file. It's not the
10069 source file, but the best we can do. */
10070 have_file_sym
= TRUE
;
10071 flinfo
->filesym_count
+= 1;
10072 memset (&osym
, 0, sizeof (osym
));
10073 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10074 osym
.st_shndx
= SHN_ABS
;
10075 if (!elf_link_output_symstrtab (flinfo
,
10076 (input_bfd
->lto_output
? NULL
10077 : input_bfd
->filename
),
10078 &osym
, bfd_abs_section_ptr
,
10085 /* Adjust the section index for the output file. */
10086 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10087 isec
->output_section
);
10088 if (osym
.st_shndx
== SHN_BAD
)
10091 /* ELF symbols in relocatable files are section relative, but
10092 in executable files they are virtual addresses. Note that
10093 this code assumes that all ELF sections have an associated
10094 BFD section with a reasonable value for output_offset; below
10095 we assume that they also have a reasonable value for
10096 output_section. Any special sections must be set up to meet
10097 these requirements. */
10098 osym
.st_value
+= isec
->output_offset
;
10099 if (!bfd_link_relocatable (flinfo
->info
))
10101 osym
.st_value
+= isec
->output_section
->vma
;
10102 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
10104 /* STT_TLS symbols are relative to PT_TLS segment base. */
10105 BFD_ASSERT (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
);
10106 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
10110 indx
= bfd_get_symcount (output_bfd
);
10111 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
10118 if (bed
->s
->arch_size
== 32)
10120 r_type_mask
= 0xff;
10126 r_type_mask
= 0xffffffff;
10131 /* Relocate the contents of each section. */
10132 sym_hashes
= elf_sym_hashes (input_bfd
);
10133 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
10135 bfd_byte
*contents
;
10137 if (! o
->linker_mark
)
10139 /* This section was omitted from the link. */
10143 if (bfd_link_relocatable (flinfo
->info
)
10144 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
10146 /* Deal with the group signature symbol. */
10147 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
10148 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
10149 asection
*osec
= o
->output_section
;
10151 if (symndx
>= locsymcount
10152 || (elf_bad_symtab (input_bfd
)
10153 && flinfo
->sections
[symndx
] == NULL
))
10155 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
10156 while (h
->root
.type
== bfd_link_hash_indirect
10157 || h
->root
.type
== bfd_link_hash_warning
)
10158 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10159 /* Arrange for symbol to be output. */
10161 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
10163 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
10165 /* We'll use the output section target_index. */
10166 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10167 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
10171 if (flinfo
->indices
[symndx
] == -1)
10173 /* Otherwise output the local symbol now. */
10174 Elf_Internal_Sym sym
= isymbuf
[symndx
];
10175 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10180 name
= bfd_elf_string_from_elf_section (input_bfd
,
10181 symtab_hdr
->sh_link
,
10186 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10188 if (sym
.st_shndx
== SHN_BAD
)
10191 sym
.st_value
+= o
->output_offset
;
10193 indx
= bfd_get_symcount (output_bfd
);
10194 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
10199 flinfo
->indices
[symndx
] = indx
;
10203 elf_section_data (osec
)->this_hdr
.sh_info
10204 = flinfo
->indices
[symndx
];
10208 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10209 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
10212 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
10214 /* Section was created by _bfd_elf_link_create_dynamic_sections
10219 /* Get the contents of the section. They have been cached by a
10220 relaxation routine. Note that o is a section in an input
10221 file, so the contents field will not have been set by any of
10222 the routines which work on output files. */
10223 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
10225 contents
= elf_section_data (o
)->this_hdr
.contents
;
10226 if (bed
->caches_rawsize
10228 && o
->rawsize
< o
->size
)
10230 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
10231 contents
= flinfo
->contents
;
10236 contents
= flinfo
->contents
;
10237 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
10241 if ((o
->flags
& SEC_RELOC
) != 0)
10243 Elf_Internal_Rela
*internal_relocs
;
10244 Elf_Internal_Rela
*rel
, *relend
;
10245 int action_discarded
;
10248 /* Get the swapped relocs. */
10250 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
10251 flinfo
->internal_relocs
, FALSE
);
10252 if (internal_relocs
== NULL
10253 && o
->reloc_count
> 0)
10256 /* We need to reverse-copy input .ctors/.dtors sections if
10257 they are placed in .init_array/.finit_array for output. */
10258 if (o
->size
> address_size
10259 && ((strncmp (o
->name
, ".ctors", 6) == 0
10260 && strcmp (o
->output_section
->name
,
10261 ".init_array") == 0)
10262 || (strncmp (o
->name
, ".dtors", 6) == 0
10263 && strcmp (o
->output_section
->name
,
10264 ".fini_array") == 0))
10265 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
10267 if (o
->size
!= o
->reloc_count
* address_size
)
10270 /* xgettext:c-format */
10271 (_("error: %B: size of section %A is not "
10272 "multiple of address size"),
10274 bfd_set_error (bfd_error_on_input
);
10277 o
->flags
|= SEC_ELF_REVERSE_COPY
;
10280 action_discarded
= -1;
10281 if (!elf_section_ignore_discarded_relocs (o
))
10282 action_discarded
= (*bed
->action_discarded
) (o
);
10284 /* Run through the relocs evaluating complex reloc symbols and
10285 looking for relocs against symbols from discarded sections
10286 or section symbols from removed link-once sections.
10287 Complain about relocs against discarded sections. Zero
10288 relocs against removed link-once sections. */
10290 rel
= internal_relocs
;
10291 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10292 for ( ; rel
< relend
; rel
++)
10294 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
10295 unsigned int s_type
;
10296 asection
**ps
, *sec
;
10297 struct elf_link_hash_entry
*h
= NULL
;
10298 const char *sym_name
;
10300 if (r_symndx
== STN_UNDEF
)
10303 if (r_symndx
>= locsymcount
10304 || (elf_bad_symtab (input_bfd
)
10305 && flinfo
->sections
[r_symndx
] == NULL
))
10307 h
= sym_hashes
[r_symndx
- extsymoff
];
10309 /* Badly formatted input files can contain relocs that
10310 reference non-existant symbols. Check here so that
10311 we do not seg fault. */
10316 sprintf_vma (buffer
, rel
->r_info
);
10318 /* xgettext:c-format */
10319 (_("error: %B contains a reloc (0x%s) for section %A "
10320 "that references a non-existent global symbol"),
10321 input_bfd
, o
, buffer
);
10322 bfd_set_error (bfd_error_bad_value
);
10326 while (h
->root
.type
== bfd_link_hash_indirect
10327 || h
->root
.type
== bfd_link_hash_warning
)
10328 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10332 /* If a plugin symbol is referenced from a non-IR file,
10333 mark the symbol as undefined. Note that the
10334 linker may attach linker created dynamic sections
10335 to the plugin bfd. Symbols defined in linker
10336 created sections are not plugin symbols. */
10337 if (h
->root
.non_ir_ref
10338 && (h
->root
.type
== bfd_link_hash_defined
10339 || h
->root
.type
== bfd_link_hash_defweak
)
10340 && (h
->root
.u
.def
.section
->flags
10341 & SEC_LINKER_CREATED
) == 0
10342 && h
->root
.u
.def
.section
->owner
!= NULL
10343 && (h
->root
.u
.def
.section
->owner
->flags
10344 & BFD_PLUGIN
) != 0)
10346 h
->root
.type
= bfd_link_hash_undefined
;
10347 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
10351 if (h
->root
.type
== bfd_link_hash_defined
10352 || h
->root
.type
== bfd_link_hash_defweak
)
10353 ps
= &h
->root
.u
.def
.section
;
10355 sym_name
= h
->root
.root
.string
;
10359 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
10361 s_type
= ELF_ST_TYPE (sym
->st_info
);
10362 ps
= &flinfo
->sections
[r_symndx
];
10363 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
10367 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
10368 && !bfd_link_relocatable (flinfo
->info
))
10371 bfd_vma dot
= (rel
->r_offset
10372 + o
->output_offset
+ o
->output_section
->vma
);
10374 printf ("Encountered a complex symbol!");
10375 printf (" (input_bfd %s, section %s, reloc %ld\n",
10376 input_bfd
->filename
, o
->name
,
10377 (long) (rel
- internal_relocs
));
10378 printf (" symbol: idx %8.8lx, name %s\n",
10379 r_symndx
, sym_name
);
10380 printf (" reloc : info %8.8lx, addr %8.8lx\n",
10381 (unsigned long) rel
->r_info
,
10382 (unsigned long) rel
->r_offset
);
10384 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
10385 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
10388 /* Symbol evaluated OK. Update to absolute value. */
10389 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
10394 if (action_discarded
!= -1 && ps
!= NULL
)
10396 /* Complain if the definition comes from a
10397 discarded section. */
10398 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
10400 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
10401 if (action_discarded
& COMPLAIN
)
10402 (*flinfo
->info
->callbacks
->einfo
)
10403 /* xgettext:c-format */
10404 (_("%X`%s' referenced in section `%A' of %B: "
10405 "defined in discarded section `%A' of %B\n"),
10406 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
10408 /* Try to do the best we can to support buggy old
10409 versions of gcc. Pretend that the symbol is
10410 really defined in the kept linkonce section.
10411 FIXME: This is quite broken. Modifying the
10412 symbol here means we will be changing all later
10413 uses of the symbol, not just in this section. */
10414 if (action_discarded
& PRETEND
)
10418 kept
= _bfd_elf_check_kept_section (sec
,
10430 /* Relocate the section by invoking a back end routine.
10432 The back end routine is responsible for adjusting the
10433 section contents as necessary, and (if using Rela relocs
10434 and generating a relocatable output file) adjusting the
10435 reloc addend as necessary.
10437 The back end routine does not have to worry about setting
10438 the reloc address or the reloc symbol index.
10440 The back end routine is given a pointer to the swapped in
10441 internal symbols, and can access the hash table entries
10442 for the external symbols via elf_sym_hashes (input_bfd).
10444 When generating relocatable output, the back end routine
10445 must handle STB_LOCAL/STT_SECTION symbols specially. The
10446 output symbol is going to be a section symbol
10447 corresponding to the output section, which will require
10448 the addend to be adjusted. */
10450 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
10451 input_bfd
, o
, contents
,
10459 || bfd_link_relocatable (flinfo
->info
)
10460 || flinfo
->info
->emitrelocations
)
10462 Elf_Internal_Rela
*irela
;
10463 Elf_Internal_Rela
*irelaend
, *irelamid
;
10464 bfd_vma last_offset
;
10465 struct elf_link_hash_entry
**rel_hash
;
10466 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
10467 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
10468 unsigned int next_erel
;
10469 bfd_boolean rela_normal
;
10470 struct bfd_elf_section_data
*esdi
, *esdo
;
10472 esdi
= elf_section_data (o
);
10473 esdo
= elf_section_data (o
->output_section
);
10474 rela_normal
= FALSE
;
10476 /* Adjust the reloc addresses and symbol indices. */
10478 irela
= internal_relocs
;
10479 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10480 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
10481 /* We start processing the REL relocs, if any. When we reach
10482 IRELAMID in the loop, we switch to the RELA relocs. */
10484 if (esdi
->rel
.hdr
!= NULL
)
10485 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
10486 * bed
->s
->int_rels_per_ext_rel
);
10487 rel_hash_list
= rel_hash
;
10488 rela_hash_list
= NULL
;
10489 last_offset
= o
->output_offset
;
10490 if (!bfd_link_relocatable (flinfo
->info
))
10491 last_offset
+= o
->output_section
->vma
;
10492 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
10494 unsigned long r_symndx
;
10496 Elf_Internal_Sym sym
;
10498 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
10504 if (irela
== irelamid
)
10506 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
10507 rela_hash_list
= rel_hash
;
10508 rela_normal
= bed
->rela_normal
;
10511 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
10514 if (irela
->r_offset
>= (bfd_vma
) -2)
10516 /* This is a reloc for a deleted entry or somesuch.
10517 Turn it into an R_*_NONE reloc, at the same
10518 offset as the last reloc. elf_eh_frame.c and
10519 bfd_elf_discard_info rely on reloc offsets
10521 irela
->r_offset
= last_offset
;
10523 irela
->r_addend
= 0;
10527 irela
->r_offset
+= o
->output_offset
;
10529 /* Relocs in an executable have to be virtual addresses. */
10530 if (!bfd_link_relocatable (flinfo
->info
))
10531 irela
->r_offset
+= o
->output_section
->vma
;
10533 last_offset
= irela
->r_offset
;
10535 r_symndx
= irela
->r_info
>> r_sym_shift
;
10536 if (r_symndx
== STN_UNDEF
)
10539 if (r_symndx
>= locsymcount
10540 || (elf_bad_symtab (input_bfd
)
10541 && flinfo
->sections
[r_symndx
] == NULL
))
10543 struct elf_link_hash_entry
*rh
;
10544 unsigned long indx
;
10546 /* This is a reloc against a global symbol. We
10547 have not yet output all the local symbols, so
10548 we do not know the symbol index of any global
10549 symbol. We set the rel_hash entry for this
10550 reloc to point to the global hash table entry
10551 for this symbol. The symbol index is then
10552 set at the end of bfd_elf_final_link. */
10553 indx
= r_symndx
- extsymoff
;
10554 rh
= elf_sym_hashes (input_bfd
)[indx
];
10555 while (rh
->root
.type
== bfd_link_hash_indirect
10556 || rh
->root
.type
== bfd_link_hash_warning
)
10557 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
10559 /* Setting the index to -2 tells
10560 elf_link_output_extsym that this symbol is
10561 used by a reloc. */
10562 BFD_ASSERT (rh
->indx
< 0);
10570 /* This is a reloc against a local symbol. */
10573 sym
= isymbuf
[r_symndx
];
10574 sec
= flinfo
->sections
[r_symndx
];
10575 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
10577 /* I suppose the backend ought to fill in the
10578 section of any STT_SECTION symbol against a
10579 processor specific section. */
10580 r_symndx
= STN_UNDEF
;
10581 if (bfd_is_abs_section (sec
))
10583 else if (sec
== NULL
|| sec
->owner
== NULL
)
10585 bfd_set_error (bfd_error_bad_value
);
10590 asection
*osec
= sec
->output_section
;
10592 /* If we have discarded a section, the output
10593 section will be the absolute section. In
10594 case of discarded SEC_MERGE sections, use
10595 the kept section. relocate_section should
10596 have already handled discarded linkonce
10598 if (bfd_is_abs_section (osec
)
10599 && sec
->kept_section
!= NULL
10600 && sec
->kept_section
->output_section
!= NULL
)
10602 osec
= sec
->kept_section
->output_section
;
10603 irela
->r_addend
-= osec
->vma
;
10606 if (!bfd_is_abs_section (osec
))
10608 r_symndx
= osec
->target_index
;
10609 if (r_symndx
== STN_UNDEF
)
10611 irela
->r_addend
+= osec
->vma
;
10612 osec
= _bfd_nearby_section (output_bfd
, osec
,
10614 irela
->r_addend
-= osec
->vma
;
10615 r_symndx
= osec
->target_index
;
10620 /* Adjust the addend according to where the
10621 section winds up in the output section. */
10623 irela
->r_addend
+= sec
->output_offset
;
10627 if (flinfo
->indices
[r_symndx
] == -1)
10629 unsigned long shlink
;
10634 if (flinfo
->info
->strip
== strip_all
)
10636 /* You can't do ld -r -s. */
10637 bfd_set_error (bfd_error_invalid_operation
);
10641 /* This symbol was skipped earlier, but
10642 since it is needed by a reloc, we
10643 must output it now. */
10644 shlink
= symtab_hdr
->sh_link
;
10645 name
= (bfd_elf_string_from_elf_section
10646 (input_bfd
, shlink
, sym
.st_name
));
10650 osec
= sec
->output_section
;
10652 _bfd_elf_section_from_bfd_section (output_bfd
,
10654 if (sym
.st_shndx
== SHN_BAD
)
10657 sym
.st_value
+= sec
->output_offset
;
10658 if (!bfd_link_relocatable (flinfo
->info
))
10660 sym
.st_value
+= osec
->vma
;
10661 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
10663 /* STT_TLS symbols are relative to PT_TLS
10665 BFD_ASSERT (elf_hash_table (flinfo
->info
)
10666 ->tls_sec
!= NULL
);
10667 sym
.st_value
-= (elf_hash_table (flinfo
->info
)
10672 indx
= bfd_get_symcount (output_bfd
);
10673 ret
= elf_link_output_symstrtab (flinfo
, name
,
10679 flinfo
->indices
[r_symndx
] = indx
;
10684 r_symndx
= flinfo
->indices
[r_symndx
];
10687 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
10688 | (irela
->r_info
& r_type_mask
));
10691 /* Swap out the relocs. */
10692 input_rel_hdr
= esdi
->rel
.hdr
;
10693 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
10695 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
10700 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
10701 * bed
->s
->int_rels_per_ext_rel
);
10702 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
10705 input_rela_hdr
= esdi
->rela
.hdr
;
10706 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
10708 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
10717 /* Write out the modified section contents. */
10718 if (bed
->elf_backend_write_section
10719 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
10722 /* Section written out. */
10724 else switch (o
->sec_info_type
)
10726 case SEC_INFO_TYPE_STABS
:
10727 if (! (_bfd_write_section_stabs
10729 &elf_hash_table (flinfo
->info
)->stab_info
,
10730 o
, &elf_section_data (o
)->sec_info
, contents
)))
10733 case SEC_INFO_TYPE_MERGE
:
10734 if (! _bfd_write_merged_section (output_bfd
, o
,
10735 elf_section_data (o
)->sec_info
))
10738 case SEC_INFO_TYPE_EH_FRAME
:
10740 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
10745 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10747 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
10755 if (! (o
->flags
& SEC_EXCLUDE
))
10757 file_ptr offset
= (file_ptr
) o
->output_offset
;
10758 bfd_size_type todo
= o
->size
;
10760 offset
*= bfd_octets_per_byte (output_bfd
);
10762 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
10764 /* Reverse-copy input section to output. */
10767 todo
-= address_size
;
10768 if (! bfd_set_section_contents (output_bfd
,
10776 offset
+= address_size
;
10780 else if (! bfd_set_section_contents (output_bfd
,
10794 /* Generate a reloc when linking an ELF file. This is a reloc
10795 requested by the linker, and does not come from any input file. This
10796 is used to build constructor and destructor tables when linking
10800 elf_reloc_link_order (bfd
*output_bfd
,
10801 struct bfd_link_info
*info
,
10802 asection
*output_section
,
10803 struct bfd_link_order
*link_order
)
10805 reloc_howto_type
*howto
;
10809 struct bfd_elf_section_reloc_data
*reldata
;
10810 struct elf_link_hash_entry
**rel_hash_ptr
;
10811 Elf_Internal_Shdr
*rel_hdr
;
10812 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
10813 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
10816 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
10818 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
10821 bfd_set_error (bfd_error_bad_value
);
10825 addend
= link_order
->u
.reloc
.p
->addend
;
10828 reldata
= &esdo
->rel
;
10829 else if (esdo
->rela
.hdr
)
10830 reldata
= &esdo
->rela
;
10837 /* Figure out the symbol index. */
10838 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
10839 if (link_order
->type
== bfd_section_reloc_link_order
)
10841 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
10842 BFD_ASSERT (indx
!= 0);
10843 *rel_hash_ptr
= NULL
;
10847 struct elf_link_hash_entry
*h
;
10849 /* Treat a reloc against a defined symbol as though it were
10850 actually against the section. */
10851 h
= ((struct elf_link_hash_entry
*)
10852 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
10853 link_order
->u
.reloc
.p
->u
.name
,
10854 FALSE
, FALSE
, TRUE
));
10856 && (h
->root
.type
== bfd_link_hash_defined
10857 || h
->root
.type
== bfd_link_hash_defweak
))
10861 section
= h
->root
.u
.def
.section
;
10862 indx
= section
->output_section
->target_index
;
10863 *rel_hash_ptr
= NULL
;
10864 /* It seems that we ought to add the symbol value to the
10865 addend here, but in practice it has already been added
10866 because it was passed to constructor_callback. */
10867 addend
+= section
->output_section
->vma
+ section
->output_offset
;
10869 else if (h
!= NULL
)
10871 /* Setting the index to -2 tells elf_link_output_extsym that
10872 this symbol is used by a reloc. */
10879 (*info
->callbacks
->unattached_reloc
)
10880 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
10885 /* If this is an inplace reloc, we must write the addend into the
10887 if (howto
->partial_inplace
&& addend
!= 0)
10889 bfd_size_type size
;
10890 bfd_reloc_status_type rstat
;
10893 const char *sym_name
;
10895 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
10896 buf
= (bfd_byte
*) bfd_zmalloc (size
);
10897 if (buf
== NULL
&& size
!= 0)
10899 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
10906 case bfd_reloc_outofrange
:
10909 case bfd_reloc_overflow
:
10910 if (link_order
->type
== bfd_section_reloc_link_order
)
10911 sym_name
= bfd_section_name (output_bfd
,
10912 link_order
->u
.reloc
.p
->u
.section
);
10914 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
10915 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
10916 howto
->name
, addend
, NULL
, NULL
,
10921 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
10923 * bfd_octets_per_byte (output_bfd
),
10930 /* The address of a reloc is relative to the section in a
10931 relocatable file, and is a virtual address in an executable
10933 offset
= link_order
->offset
;
10934 if (! bfd_link_relocatable (info
))
10935 offset
+= output_section
->vma
;
10937 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
10939 irel
[i
].r_offset
= offset
;
10940 irel
[i
].r_info
= 0;
10941 irel
[i
].r_addend
= 0;
10943 if (bed
->s
->arch_size
== 32)
10944 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
10946 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
10948 rel_hdr
= reldata
->hdr
;
10949 erel
= rel_hdr
->contents
;
10950 if (rel_hdr
->sh_type
== SHT_REL
)
10952 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
10953 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
10957 irel
[0].r_addend
= addend
;
10958 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
10959 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
10968 /* Get the output vma of the section pointed to by the sh_link field. */
10971 elf_get_linked_section_vma (struct bfd_link_order
*p
)
10973 Elf_Internal_Shdr
**elf_shdrp
;
10977 s
= p
->u
.indirect
.section
;
10978 elf_shdrp
= elf_elfsections (s
->owner
);
10979 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
10980 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
10982 The Intel C compiler generates SHT_IA_64_UNWIND with
10983 SHF_LINK_ORDER. But it doesn't set the sh_link or
10984 sh_info fields. Hence we could get the situation
10985 where elfsec is 0. */
10988 const struct elf_backend_data
*bed
10989 = get_elf_backend_data (s
->owner
);
10990 if (bed
->link_order_error_handler
)
10991 bed
->link_order_error_handler
10992 /* xgettext:c-format */
10993 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
10998 s
= elf_shdrp
[elfsec
]->bfd_section
;
10999 return s
->output_section
->vma
+ s
->output_offset
;
11004 /* Compare two sections based on the locations of the sections they are
11005 linked to. Used by elf_fixup_link_order. */
11008 compare_link_order (const void * a
, const void * b
)
11013 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
11014 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
11017 return apos
> bpos
;
11021 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
11022 order as their linked sections. Returns false if this could not be done
11023 because an output section includes both ordered and unordered
11024 sections. Ideally we'd do this in the linker proper. */
11027 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
11029 int seen_linkorder
;
11032 struct bfd_link_order
*p
;
11034 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11036 struct bfd_link_order
**sections
;
11037 asection
*s
, *other_sec
, *linkorder_sec
;
11041 linkorder_sec
= NULL
;
11043 seen_linkorder
= 0;
11044 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11046 if (p
->type
== bfd_indirect_link_order
)
11048 s
= p
->u
.indirect
.section
;
11050 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
11051 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
11052 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
11053 && elfsec
< elf_numsections (sub
)
11054 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
11055 && elf_elfsections (sub
)[elfsec
]->sh_link
< elf_numsections (sub
))
11069 if (seen_other
&& seen_linkorder
)
11071 if (other_sec
&& linkorder_sec
)
11073 /* xgettext:c-format */
11074 (_("%A has both ordered [`%A' in %B] "
11075 "and unordered [`%A' in %B] sections"),
11077 linkorder_sec
->owner
, other_sec
,
11081 (_("%A has both ordered and unordered sections"), o
);
11082 bfd_set_error (bfd_error_bad_value
);
11087 if (!seen_linkorder
)
11090 sections
= (struct bfd_link_order
**)
11091 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
11092 if (sections
== NULL
)
11094 seen_linkorder
= 0;
11096 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11098 sections
[seen_linkorder
++] = p
;
11100 /* Sort the input sections in the order of their linked section. */
11101 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
11102 compare_link_order
);
11104 /* Change the offsets of the sections. */
11106 for (n
= 0; n
< seen_linkorder
; n
++)
11108 s
= sections
[n
]->u
.indirect
.section
;
11109 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
11110 s
->output_offset
= offset
/ bfd_octets_per_byte (abfd
);
11111 sections
[n
]->offset
= offset
;
11112 offset
+= sections
[n
]->size
;
11119 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11120 Returns TRUE upon success, FALSE otherwise. */
11123 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11125 bfd_boolean ret
= FALSE
;
11127 const struct elf_backend_data
*bed
;
11129 enum bfd_architecture arch
;
11131 asymbol
**sympp
= NULL
;
11135 elf_symbol_type
*osymbuf
;
11137 implib_bfd
= info
->out_implib_bfd
;
11138 bed
= get_elf_backend_data (abfd
);
11140 if (!bfd_set_format (implib_bfd
, bfd_object
))
11143 flags
= bfd_get_file_flags (abfd
);
11144 flags
&= ~HAS_RELOC
;
11145 if (!bfd_set_start_address (implib_bfd
, 0)
11146 || !bfd_set_file_flags (implib_bfd
, flags
))
11149 /* Copy architecture of output file to import library file. */
11150 arch
= bfd_get_arch (abfd
);
11151 mach
= bfd_get_mach (abfd
);
11152 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11153 && (abfd
->target_defaulted
11154 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11157 /* Get symbol table size. */
11158 symsize
= bfd_get_symtab_upper_bound (abfd
);
11162 /* Read in the symbol table. */
11163 sympp
= (asymbol
**) xmalloc (symsize
);
11164 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11168 /* Allow the BFD backend to copy any private header data it
11169 understands from the output BFD to the import library BFD. */
11170 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11173 /* Filter symbols to appear in the import library. */
11174 if (bed
->elf_backend_filter_implib_symbols
)
11175 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11178 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11181 bfd_set_error (bfd_error_no_symbols
);
11182 _bfd_error_handler (_("%B: no symbol found for import library"),
11188 /* Make symbols absolute. */
11189 osymbuf
= (elf_symbol_type
*) bfd_alloc2 (implib_bfd
, symcount
,
11190 sizeof (*osymbuf
));
11191 for (src_count
= 0; src_count
< symcount
; src_count
++)
11193 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11194 sizeof (*osymbuf
));
11195 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11196 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11197 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11198 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11199 osymbuf
[src_count
].symbol
.value
;
11200 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11203 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
11205 /* Allow the BFD backend to copy any private data it understands
11206 from the output BFD to the import library BFD. This is done last
11207 to permit the routine to look at the filtered symbol table. */
11208 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
11211 if (!bfd_close (implib_bfd
))
11222 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
11226 if (flinfo
->symstrtab
!= NULL
)
11227 _bfd_elf_strtab_free (flinfo
->symstrtab
);
11228 if (flinfo
->contents
!= NULL
)
11229 free (flinfo
->contents
);
11230 if (flinfo
->external_relocs
!= NULL
)
11231 free (flinfo
->external_relocs
);
11232 if (flinfo
->internal_relocs
!= NULL
)
11233 free (flinfo
->internal_relocs
);
11234 if (flinfo
->external_syms
!= NULL
)
11235 free (flinfo
->external_syms
);
11236 if (flinfo
->locsym_shndx
!= NULL
)
11237 free (flinfo
->locsym_shndx
);
11238 if (flinfo
->internal_syms
!= NULL
)
11239 free (flinfo
->internal_syms
);
11240 if (flinfo
->indices
!= NULL
)
11241 free (flinfo
->indices
);
11242 if (flinfo
->sections
!= NULL
)
11243 free (flinfo
->sections
);
11244 if (flinfo
->symshndxbuf
!= NULL
)
11245 free (flinfo
->symshndxbuf
);
11246 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
11248 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11249 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11250 free (esdo
->rel
.hashes
);
11251 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11252 free (esdo
->rela
.hashes
);
11256 /* Do the final step of an ELF link. */
11259 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
11261 bfd_boolean dynamic
;
11262 bfd_boolean emit_relocs
;
11264 struct elf_final_link_info flinfo
;
11266 struct bfd_link_order
*p
;
11268 bfd_size_type max_contents_size
;
11269 bfd_size_type max_external_reloc_size
;
11270 bfd_size_type max_internal_reloc_count
;
11271 bfd_size_type max_sym_count
;
11272 bfd_size_type max_sym_shndx_count
;
11273 Elf_Internal_Sym elfsym
;
11275 Elf_Internal_Shdr
*symtab_hdr
;
11276 Elf_Internal_Shdr
*symtab_shndx_hdr
;
11277 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11278 struct elf_outext_info eoinfo
;
11279 bfd_boolean merged
;
11280 size_t relativecount
= 0;
11281 asection
*reldyn
= 0;
11283 asection
*attr_section
= NULL
;
11284 bfd_vma attr_size
= 0;
11285 const char *std_attrs_section
;
11286 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
11288 if (!is_elf_hash_table (htab
))
11291 if (bfd_link_pic (info
))
11292 abfd
->flags
|= DYNAMIC
;
11294 dynamic
= htab
->dynamic_sections_created
;
11295 dynobj
= htab
->dynobj
;
11297 emit_relocs
= (bfd_link_relocatable (info
)
11298 || info
->emitrelocations
);
11300 flinfo
.info
= info
;
11301 flinfo
.output_bfd
= abfd
;
11302 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
11303 if (flinfo
.symstrtab
== NULL
)
11308 flinfo
.hash_sec
= NULL
;
11309 flinfo
.symver_sec
= NULL
;
11313 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
11314 /* Note that dynsym_sec can be NULL (on VMS). */
11315 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
11316 /* Note that it is OK if symver_sec is NULL. */
11319 flinfo
.contents
= NULL
;
11320 flinfo
.external_relocs
= NULL
;
11321 flinfo
.internal_relocs
= NULL
;
11322 flinfo
.external_syms
= NULL
;
11323 flinfo
.locsym_shndx
= NULL
;
11324 flinfo
.internal_syms
= NULL
;
11325 flinfo
.indices
= NULL
;
11326 flinfo
.sections
= NULL
;
11327 flinfo
.symshndxbuf
= NULL
;
11328 flinfo
.filesym_count
= 0;
11330 /* The object attributes have been merged. Remove the input
11331 sections from the link, and set the contents of the output
11333 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
11334 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11336 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
11337 || strcmp (o
->name
, ".gnu.attributes") == 0)
11339 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11341 asection
*input_section
;
11343 if (p
->type
!= bfd_indirect_link_order
)
11345 input_section
= p
->u
.indirect
.section
;
11346 /* Hack: reset the SEC_HAS_CONTENTS flag so that
11347 elf_link_input_bfd ignores this section. */
11348 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
11351 attr_size
= bfd_elf_obj_attr_size (abfd
);
11354 bfd_set_section_size (abfd
, o
, attr_size
);
11356 /* Skip this section later on. */
11357 o
->map_head
.link_order
= NULL
;
11360 o
->flags
|= SEC_EXCLUDE
;
11364 /* Count up the number of relocations we will output for each output
11365 section, so that we know the sizes of the reloc sections. We
11366 also figure out some maximum sizes. */
11367 max_contents_size
= 0;
11368 max_external_reloc_size
= 0;
11369 max_internal_reloc_count
= 0;
11371 max_sym_shndx_count
= 0;
11373 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11375 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11376 o
->reloc_count
= 0;
11378 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11380 unsigned int reloc_count
= 0;
11381 unsigned int additional_reloc_count
= 0;
11382 struct bfd_elf_section_data
*esdi
= NULL
;
11384 if (p
->type
== bfd_section_reloc_link_order
11385 || p
->type
== bfd_symbol_reloc_link_order
)
11387 else if (p
->type
== bfd_indirect_link_order
)
11391 sec
= p
->u
.indirect
.section
;
11393 /* Mark all sections which are to be included in the
11394 link. This will normally be every section. We need
11395 to do this so that we can identify any sections which
11396 the linker has decided to not include. */
11397 sec
->linker_mark
= TRUE
;
11399 if (sec
->flags
& SEC_MERGE
)
11402 if (sec
->rawsize
> max_contents_size
)
11403 max_contents_size
= sec
->rawsize
;
11404 if (sec
->size
> max_contents_size
)
11405 max_contents_size
= sec
->size
;
11407 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
11408 && (sec
->owner
->flags
& DYNAMIC
) == 0)
11412 /* We are interested in just local symbols, not all
11414 if (elf_bad_symtab (sec
->owner
))
11415 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
11416 / bed
->s
->sizeof_sym
);
11418 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
11420 if (sym_count
> max_sym_count
)
11421 max_sym_count
= sym_count
;
11423 if (sym_count
> max_sym_shndx_count
11424 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
11425 max_sym_shndx_count
= sym_count
;
11427 if (esdo
->this_hdr
.sh_type
== SHT_REL
11428 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
11429 /* Some backends use reloc_count in relocation sections
11430 to count particular types of relocs. Of course,
11431 reloc sections themselves can't have relocations. */
11433 else if (emit_relocs
)
11435 reloc_count
= sec
->reloc_count
;
11436 if (bed
->elf_backend_count_additional_relocs
)
11439 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
11440 additional_reloc_count
+= c
;
11443 else if (bed
->elf_backend_count_relocs
)
11444 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
11446 esdi
= elf_section_data (sec
);
11448 if ((sec
->flags
& SEC_RELOC
) != 0)
11450 size_t ext_size
= 0;
11452 if (esdi
->rel
.hdr
!= NULL
)
11453 ext_size
= esdi
->rel
.hdr
->sh_size
;
11454 if (esdi
->rela
.hdr
!= NULL
)
11455 ext_size
+= esdi
->rela
.hdr
->sh_size
;
11457 if (ext_size
> max_external_reloc_size
)
11458 max_external_reloc_size
= ext_size
;
11459 if (sec
->reloc_count
> max_internal_reloc_count
)
11460 max_internal_reloc_count
= sec
->reloc_count
;
11465 if (reloc_count
== 0)
11468 reloc_count
+= additional_reloc_count
;
11469 o
->reloc_count
+= reloc_count
;
11471 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
11475 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
11476 esdo
->rel
.count
+= additional_reloc_count
;
11478 if (esdi
->rela
.hdr
)
11480 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
11481 esdo
->rela
.count
+= additional_reloc_count
;
11487 esdo
->rela
.count
+= reloc_count
;
11489 esdo
->rel
.count
+= reloc_count
;
11493 if (o
->reloc_count
> 0)
11494 o
->flags
|= SEC_RELOC
;
11497 /* Explicitly clear the SEC_RELOC flag. The linker tends to
11498 set it (this is probably a bug) and if it is set
11499 assign_section_numbers will create a reloc section. */
11500 o
->flags
&=~ SEC_RELOC
;
11503 /* If the SEC_ALLOC flag is not set, force the section VMA to
11504 zero. This is done in elf_fake_sections as well, but forcing
11505 the VMA to 0 here will ensure that relocs against these
11506 sections are handled correctly. */
11507 if ((o
->flags
& SEC_ALLOC
) == 0
11508 && ! o
->user_set_vma
)
11512 if (! bfd_link_relocatable (info
) && merged
)
11513 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
11515 /* Figure out the file positions for everything but the symbol table
11516 and the relocs. We set symcount to force assign_section_numbers
11517 to create a symbol table. */
11518 bfd_get_symcount (abfd
) = info
->strip
!= strip_all
|| emit_relocs
;
11519 BFD_ASSERT (! abfd
->output_has_begun
);
11520 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
11523 /* Set sizes, and assign file positions for reloc sections. */
11524 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11526 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11527 if ((o
->flags
& SEC_RELOC
) != 0)
11530 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
11534 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
11538 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
11539 to count upwards while actually outputting the relocations. */
11540 esdo
->rel
.count
= 0;
11541 esdo
->rela
.count
= 0;
11543 if (esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
11545 /* Cache the section contents so that they can be compressed
11546 later. Use bfd_malloc since it will be freed by
11547 bfd_compress_section_contents. */
11548 unsigned char *contents
= esdo
->this_hdr
.contents
;
11549 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
11552 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
11553 if (contents
== NULL
)
11555 esdo
->this_hdr
.contents
= contents
;
11559 /* We have now assigned file positions for all the sections except
11560 .symtab, .strtab, and non-loaded reloc sections. We start the
11561 .symtab section at the current file position, and write directly
11562 to it. We build the .strtab section in memory. */
11563 bfd_get_symcount (abfd
) = 0;
11564 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11565 /* sh_name is set in prep_headers. */
11566 symtab_hdr
->sh_type
= SHT_SYMTAB
;
11567 /* sh_flags, sh_addr and sh_size all start off zero. */
11568 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
11569 /* sh_link is set in assign_section_numbers. */
11570 /* sh_info is set below. */
11571 /* sh_offset is set just below. */
11572 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
11574 if (max_sym_count
< 20)
11575 max_sym_count
= 20;
11576 htab
->strtabsize
= max_sym_count
;
11577 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
11578 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
11579 if (htab
->strtab
== NULL
)
11581 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
11583 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
11584 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
11586 if (info
->strip
!= strip_all
|| emit_relocs
)
11588 file_ptr off
= elf_next_file_pos (abfd
);
11590 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
11592 /* Note that at this point elf_next_file_pos (abfd) is
11593 incorrect. We do not yet know the size of the .symtab section.
11594 We correct next_file_pos below, after we do know the size. */
11596 /* Start writing out the symbol table. The first symbol is always a
11598 elfsym
.st_value
= 0;
11599 elfsym
.st_size
= 0;
11600 elfsym
.st_info
= 0;
11601 elfsym
.st_other
= 0;
11602 elfsym
.st_shndx
= SHN_UNDEF
;
11603 elfsym
.st_target_internal
= 0;
11604 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
11605 bfd_und_section_ptr
, NULL
) != 1)
11608 /* Output a symbol for each section. We output these even if we are
11609 discarding local symbols, since they are used for relocs. These
11610 symbols have no names. We store the index of each one in the
11611 index field of the section, so that we can find it again when
11612 outputting relocs. */
11614 elfsym
.st_size
= 0;
11615 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
11616 elfsym
.st_other
= 0;
11617 elfsym
.st_value
= 0;
11618 elfsym
.st_target_internal
= 0;
11619 for (i
= 1; i
< elf_numsections (abfd
); i
++)
11621 o
= bfd_section_from_elf_index (abfd
, i
);
11624 o
->target_index
= bfd_get_symcount (abfd
);
11625 elfsym
.st_shndx
= i
;
11626 if (!bfd_link_relocatable (info
))
11627 elfsym
.st_value
= o
->vma
;
11628 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
, o
,
11635 /* Allocate some memory to hold information read in from the input
11637 if (max_contents_size
!= 0)
11639 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
11640 if (flinfo
.contents
== NULL
)
11644 if (max_external_reloc_size
!= 0)
11646 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
11647 if (flinfo
.external_relocs
== NULL
)
11651 if (max_internal_reloc_count
!= 0)
11653 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
11654 amt
*= sizeof (Elf_Internal_Rela
);
11655 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
11656 if (flinfo
.internal_relocs
== NULL
)
11660 if (max_sym_count
!= 0)
11662 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
11663 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
11664 if (flinfo
.external_syms
== NULL
)
11667 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
11668 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
11669 if (flinfo
.internal_syms
== NULL
)
11672 amt
= max_sym_count
* sizeof (long);
11673 flinfo
.indices
= (long int *) bfd_malloc (amt
);
11674 if (flinfo
.indices
== NULL
)
11677 amt
= max_sym_count
* sizeof (asection
*);
11678 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
11679 if (flinfo
.sections
== NULL
)
11683 if (max_sym_shndx_count
!= 0)
11685 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
11686 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
11687 if (flinfo
.locsym_shndx
== NULL
)
11693 bfd_vma base
, end
= 0;
11696 for (sec
= htab
->tls_sec
;
11697 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
11700 bfd_size_type size
= sec
->size
;
11703 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
11705 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
11708 size
= ord
->offset
+ ord
->size
;
11710 end
= sec
->vma
+ size
;
11712 base
= htab
->tls_sec
->vma
;
11713 /* Only align end of TLS section if static TLS doesn't have special
11714 alignment requirements. */
11715 if (bed
->static_tls_alignment
== 1)
11716 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
11717 htab
->tls_size
= end
- base
;
11720 /* Reorder SHF_LINK_ORDER sections. */
11721 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11723 if (!elf_fixup_link_order (abfd
, o
))
11727 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
11730 /* Since ELF permits relocations to be against local symbols, we
11731 must have the local symbols available when we do the relocations.
11732 Since we would rather only read the local symbols once, and we
11733 would rather not keep them in memory, we handle all the
11734 relocations for a single input file at the same time.
11736 Unfortunately, there is no way to know the total number of local
11737 symbols until we have seen all of them, and the local symbol
11738 indices precede the global symbol indices. This means that when
11739 we are generating relocatable output, and we see a reloc against
11740 a global symbol, we can not know the symbol index until we have
11741 finished examining all the local symbols to see which ones we are
11742 going to output. To deal with this, we keep the relocations in
11743 memory, and don't output them until the end of the link. This is
11744 an unfortunate waste of memory, but I don't see a good way around
11745 it. Fortunately, it only happens when performing a relocatable
11746 link, which is not the common case. FIXME: If keep_memory is set
11747 we could write the relocs out and then read them again; I don't
11748 know how bad the memory loss will be. */
11750 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
11751 sub
->output_has_begun
= FALSE
;
11752 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11754 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11756 if (p
->type
== bfd_indirect_link_order
11757 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
11758 == bfd_target_elf_flavour
)
11759 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
11761 if (! sub
->output_has_begun
)
11763 if (! elf_link_input_bfd (&flinfo
, sub
))
11765 sub
->output_has_begun
= TRUE
;
11768 else if (p
->type
== bfd_section_reloc_link_order
11769 || p
->type
== bfd_symbol_reloc_link_order
)
11771 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
11776 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
11778 if (p
->type
== bfd_indirect_link_order
11779 && (bfd_get_flavour (sub
)
11780 == bfd_target_elf_flavour
)
11781 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
11782 != bed
->s
->elfclass
))
11784 const char *iclass
, *oclass
;
11786 switch (bed
->s
->elfclass
)
11788 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
11789 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
11790 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
11794 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
11796 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
11797 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
11798 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
11802 bfd_set_error (bfd_error_wrong_format
);
11804 /* xgettext:c-format */
11805 (_("%B: file class %s incompatible with %s"),
11806 sub
, iclass
, oclass
);
11815 /* Free symbol buffer if needed. */
11816 if (!info
->reduce_memory_overheads
)
11818 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
11819 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
11820 && elf_tdata (sub
)->symbuf
)
11822 free (elf_tdata (sub
)->symbuf
);
11823 elf_tdata (sub
)->symbuf
= NULL
;
11827 /* Output any global symbols that got converted to local in a
11828 version script or due to symbol visibility. We do this in a
11829 separate step since ELF requires all local symbols to appear
11830 prior to any global symbols. FIXME: We should only do this if
11831 some global symbols were, in fact, converted to become local.
11832 FIXME: Will this work correctly with the Irix 5 linker? */
11833 eoinfo
.failed
= FALSE
;
11834 eoinfo
.flinfo
= &flinfo
;
11835 eoinfo
.localsyms
= TRUE
;
11836 eoinfo
.file_sym_done
= FALSE
;
11837 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
11841 /* If backend needs to output some local symbols not present in the hash
11842 table, do it now. */
11843 if (bed
->elf_backend_output_arch_local_syms
11844 && (info
->strip
!= strip_all
|| emit_relocs
))
11846 typedef int (*out_sym_func
)
11847 (void *, const char *, Elf_Internal_Sym
*, asection
*,
11848 struct elf_link_hash_entry
*);
11850 if (! ((*bed
->elf_backend_output_arch_local_syms
)
11851 (abfd
, info
, &flinfo
,
11852 (out_sym_func
) elf_link_output_symstrtab
)))
11856 /* That wrote out all the local symbols. Finish up the symbol table
11857 with the global symbols. Even if we want to strip everything we
11858 can, we still need to deal with those global symbols that got
11859 converted to local in a version script. */
11861 /* The sh_info field records the index of the first non local symbol. */
11862 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
11865 && htab
->dynsym
!= NULL
11866 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
11868 Elf_Internal_Sym sym
;
11869 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
11871 o
= htab
->dynsym
->output_section
;
11872 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
11874 /* Write out the section symbols for the output sections. */
11875 if (bfd_link_pic (info
)
11876 || htab
->is_relocatable_executable
)
11882 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
11884 sym
.st_target_internal
= 0;
11886 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
11892 dynindx
= elf_section_data (s
)->dynindx
;
11895 indx
= elf_section_data (s
)->this_idx
;
11896 BFD_ASSERT (indx
> 0);
11897 sym
.st_shndx
= indx
;
11898 if (! check_dynsym (abfd
, &sym
))
11900 sym
.st_value
= s
->vma
;
11901 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
11902 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
11906 /* Write out the local dynsyms. */
11907 if (htab
->dynlocal
)
11909 struct elf_link_local_dynamic_entry
*e
;
11910 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
11915 /* Copy the internal symbol and turn off visibility.
11916 Note that we saved a word of storage and overwrote
11917 the original st_name with the dynstr_index. */
11919 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
11921 s
= bfd_section_from_elf_index (e
->input_bfd
,
11926 elf_section_data (s
->output_section
)->this_idx
;
11927 if (! check_dynsym (abfd
, &sym
))
11929 sym
.st_value
= (s
->output_section
->vma
11931 + e
->isym
.st_value
);
11934 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
11935 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
11940 /* We get the global symbols from the hash table. */
11941 eoinfo
.failed
= FALSE
;
11942 eoinfo
.localsyms
= FALSE
;
11943 eoinfo
.flinfo
= &flinfo
;
11944 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
11948 /* If backend needs to output some symbols not present in the hash
11949 table, do it now. */
11950 if (bed
->elf_backend_output_arch_syms
11951 && (info
->strip
!= strip_all
|| emit_relocs
))
11953 typedef int (*out_sym_func
)
11954 (void *, const char *, Elf_Internal_Sym
*, asection
*,
11955 struct elf_link_hash_entry
*);
11957 if (! ((*bed
->elf_backend_output_arch_syms
)
11958 (abfd
, info
, &flinfo
,
11959 (out_sym_func
) elf_link_output_symstrtab
)))
11963 /* Finalize the .strtab section. */
11964 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
11966 /* Swap out the .strtab section. */
11967 if (!elf_link_swap_symbols_out (&flinfo
))
11970 /* Now we know the size of the symtab section. */
11971 if (bfd_get_symcount (abfd
) > 0)
11973 /* Finish up and write out the symbol string table (.strtab)
11975 Elf_Internal_Shdr
*symstrtab_hdr
;
11976 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
11978 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
11979 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
11981 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
11982 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
11983 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
11984 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
11985 symtab_shndx_hdr
->sh_size
= amt
;
11987 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
11990 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
11991 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
11995 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
11996 /* sh_name was set in prep_headers. */
11997 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
11998 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
11999 symstrtab_hdr
->sh_addr
= 0;
12000 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12001 symstrtab_hdr
->sh_entsize
= 0;
12002 symstrtab_hdr
->sh_link
= 0;
12003 symstrtab_hdr
->sh_info
= 0;
12004 /* sh_offset is set just below. */
12005 symstrtab_hdr
->sh_addralign
= 1;
12007 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12009 elf_next_file_pos (abfd
) = off
;
12011 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12012 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12016 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12018 _bfd_error_handler (_("%B: failed to generate import library"),
12019 info
->out_implib_bfd
);
12023 /* Adjust the relocs to have the correct symbol indices. */
12024 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12026 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12028 if ((o
->flags
& SEC_RELOC
) == 0)
12031 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12032 if (esdo
->rel
.hdr
!= NULL
12033 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
))
12035 if (esdo
->rela
.hdr
!= NULL
12036 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
))
12039 /* Set the reloc_count field to 0 to prevent write_relocs from
12040 trying to swap the relocs out itself. */
12041 o
->reloc_count
= 0;
12044 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12045 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12047 /* If we are linking against a dynamic object, or generating a
12048 shared library, finish up the dynamic linking information. */
12051 bfd_byte
*dyncon
, *dynconend
;
12053 /* Fix up .dynamic entries. */
12054 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12055 BFD_ASSERT (o
!= NULL
);
12057 dyncon
= o
->contents
;
12058 dynconend
= o
->contents
+ o
->size
;
12059 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12061 Elf_Internal_Dyn dyn
;
12065 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12072 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12074 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12076 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12077 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12080 dyn
.d_un
.d_val
= relativecount
;
12087 name
= info
->init_function
;
12090 name
= info
->fini_function
;
12093 struct elf_link_hash_entry
*h
;
12095 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
12097 && (h
->root
.type
== bfd_link_hash_defined
12098 || h
->root
.type
== bfd_link_hash_defweak
))
12100 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12101 o
= h
->root
.u
.def
.section
;
12102 if (o
->output_section
!= NULL
)
12103 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12104 + o
->output_offset
);
12107 /* The symbol is imported from another shared
12108 library and does not apply to this one. */
12109 dyn
.d_un
.d_ptr
= 0;
12116 case DT_PREINIT_ARRAYSZ
:
12117 name
= ".preinit_array";
12119 case DT_INIT_ARRAYSZ
:
12120 name
= ".init_array";
12122 case DT_FINI_ARRAYSZ
:
12123 name
= ".fini_array";
12125 o
= bfd_get_section_by_name (abfd
, name
);
12129 (_("could not find section %s"), name
);
12134 (_("warning: %s section has zero size"), name
);
12135 dyn
.d_un
.d_val
= o
->size
;
12138 case DT_PREINIT_ARRAY
:
12139 name
= ".preinit_array";
12141 case DT_INIT_ARRAY
:
12142 name
= ".init_array";
12144 case DT_FINI_ARRAY
:
12145 name
= ".fini_array";
12147 o
= bfd_get_section_by_name (abfd
, name
);
12154 name
= ".gnu.hash";
12163 name
= ".gnu.version_d";
12166 name
= ".gnu.version_r";
12169 name
= ".gnu.version";
12171 o
= bfd_get_linker_section (dynobj
, name
);
12176 (_("could not find section %s"), name
);
12179 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
12182 (_("warning: section '%s' is being made into a note"), name
);
12183 bfd_set_error (bfd_error_nonrepresentable_section
);
12186 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
12193 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
12197 dyn
.d_un
.d_val
= 0;
12198 dyn
.d_un
.d_ptr
= 0;
12199 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12201 Elf_Internal_Shdr
*hdr
;
12203 hdr
= elf_elfsections (abfd
)[i
];
12204 if (hdr
->sh_type
== type
12205 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
12207 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
12208 dyn
.d_un
.d_val
+= hdr
->sh_size
;
12211 if (dyn
.d_un
.d_ptr
== 0
12212 || hdr
->sh_addr
< dyn
.d_un
.d_ptr
)
12213 dyn
.d_un
.d_ptr
= hdr
->sh_addr
;
12217 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
12219 /* Don't count procedure linkage table relocs in the
12220 overall reloc count. */
12221 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
12222 dyn
.d_un
.d_val
-= htab
->srelplt
->size
;
12223 /* If .rela.plt is the first .rela section, exclude
12224 it from DT_RELA. */
12225 else if (dyn
.d_un
.d_ptr
== (htab
->srelplt
->output_section
->vma
12226 + htab
->srelplt
->output_offset
))
12227 dyn
.d_un
.d_ptr
+= htab
->srelplt
->size
;
12231 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
12235 /* If we have created any dynamic sections, then output them. */
12236 if (dynobj
!= NULL
)
12238 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
12241 /* Check for DT_TEXTREL (late, in case the backend removes it). */
12242 if (((info
->warn_shared_textrel
&& bfd_link_pic (info
))
12243 || info
->error_textrel
)
12244 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
12246 bfd_byte
*dyncon
, *dynconend
;
12248 dyncon
= o
->contents
;
12249 dynconend
= o
->contents
+ o
->size
;
12250 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12252 Elf_Internal_Dyn dyn
;
12254 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12256 if (dyn
.d_tag
== DT_TEXTREL
)
12258 if (info
->error_textrel
)
12259 info
->callbacks
->einfo
12260 (_("%P%X: read-only segment has dynamic relocations.\n"));
12262 info
->callbacks
->einfo
12263 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
12269 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
12271 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
12273 || o
->output_section
== bfd_abs_section_ptr
)
12275 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
12277 /* At this point, we are only interested in sections
12278 created by _bfd_elf_link_create_dynamic_sections. */
12281 if (htab
->stab_info
.stabstr
== o
)
12283 if (htab
->eh_info
.hdr_sec
== o
)
12285 if (strcmp (o
->name
, ".dynstr") != 0)
12287 if (! bfd_set_section_contents (abfd
, o
->output_section
,
12289 (file_ptr
) o
->output_offset
12290 * bfd_octets_per_byte (abfd
),
12296 /* The contents of the .dynstr section are actually in a
12300 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
12301 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
12302 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
12308 if (bfd_link_relocatable (info
))
12310 bfd_boolean failed
= FALSE
;
12312 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
12317 /* If we have optimized stabs strings, output them. */
12318 if (htab
->stab_info
.stabstr
!= NULL
)
12320 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
12324 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
12327 elf_final_link_free (abfd
, &flinfo
);
12329 elf_linker (abfd
) = TRUE
;
12333 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
12334 if (contents
== NULL
)
12335 return FALSE
; /* Bail out and fail. */
12336 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
12337 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
12344 elf_final_link_free (abfd
, &flinfo
);
12348 /* Initialize COOKIE for input bfd ABFD. */
12351 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
12352 struct bfd_link_info
*info
, bfd
*abfd
)
12354 Elf_Internal_Shdr
*symtab_hdr
;
12355 const struct elf_backend_data
*bed
;
12357 bed
= get_elf_backend_data (abfd
);
12358 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12360 cookie
->abfd
= abfd
;
12361 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
12362 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
12363 if (cookie
->bad_symtab
)
12365 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
12366 cookie
->extsymoff
= 0;
12370 cookie
->locsymcount
= symtab_hdr
->sh_info
;
12371 cookie
->extsymoff
= symtab_hdr
->sh_info
;
12374 if (bed
->s
->arch_size
== 32)
12375 cookie
->r_sym_shift
= 8;
12377 cookie
->r_sym_shift
= 32;
12379 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
12380 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
12382 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
12383 cookie
->locsymcount
, 0,
12385 if (cookie
->locsyms
== NULL
)
12387 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
12390 if (info
->keep_memory
)
12391 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
12396 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
12399 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
12401 Elf_Internal_Shdr
*symtab_hdr
;
12403 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12404 if (cookie
->locsyms
!= NULL
12405 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
12406 free (cookie
->locsyms
);
12409 /* Initialize the relocation information in COOKIE for input section SEC
12410 of input bfd ABFD. */
12413 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
12414 struct bfd_link_info
*info
, bfd
*abfd
,
12417 const struct elf_backend_data
*bed
;
12419 if (sec
->reloc_count
== 0)
12421 cookie
->rels
= NULL
;
12422 cookie
->relend
= NULL
;
12426 bed
= get_elf_backend_data (abfd
);
12428 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
12429 info
->keep_memory
);
12430 if (cookie
->rels
== NULL
)
12432 cookie
->rel
= cookie
->rels
;
12433 cookie
->relend
= (cookie
->rels
12434 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
12436 cookie
->rel
= cookie
->rels
;
12440 /* Free the memory allocated by init_reloc_cookie_rels,
12444 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
12447 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
12448 free (cookie
->rels
);
12451 /* Initialize the whole of COOKIE for input section SEC. */
12454 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
12455 struct bfd_link_info
*info
,
12458 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
12460 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
12465 fini_reloc_cookie (cookie
, sec
->owner
);
12470 /* Free the memory allocated by init_reloc_cookie_for_section,
12474 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
12477 fini_reloc_cookie_rels (cookie
, sec
);
12478 fini_reloc_cookie (cookie
, sec
->owner
);
12481 /* Garbage collect unused sections. */
12483 /* Default gc_mark_hook. */
12486 _bfd_elf_gc_mark_hook (asection
*sec
,
12487 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
12488 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
12489 struct elf_link_hash_entry
*h
,
12490 Elf_Internal_Sym
*sym
)
12494 switch (h
->root
.type
)
12496 case bfd_link_hash_defined
:
12497 case bfd_link_hash_defweak
:
12498 return h
->root
.u
.def
.section
;
12500 case bfd_link_hash_common
:
12501 return h
->root
.u
.c
.p
->section
;
12508 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
12513 /* For undefined __start_<name> and __stop_<name> symbols, return the
12514 first input section matching <name>. Return NULL otherwise. */
12517 _bfd_elf_is_start_stop (const struct bfd_link_info
*info
,
12518 struct elf_link_hash_entry
*h
)
12521 const char *sec_name
;
12523 if (h
->root
.type
!= bfd_link_hash_undefined
12524 && h
->root
.type
!= bfd_link_hash_undefweak
)
12527 s
= h
->root
.u
.undef
.section
;
12530 if (s
== (asection
*) 0 - 1)
12536 if (strncmp (h
->root
.root
.string
, "__start_", 8) == 0)
12537 sec_name
= h
->root
.root
.string
+ 8;
12538 else if (strncmp (h
->root
.root
.string
, "__stop_", 7) == 0)
12539 sec_name
= h
->root
.root
.string
+ 7;
12541 if (sec_name
!= NULL
&& *sec_name
!= '\0')
12545 for (i
= info
->input_bfds
; i
!= NULL
; i
= i
->link
.next
)
12547 s
= bfd_get_section_by_name (i
, sec_name
);
12550 h
->root
.u
.undef
.section
= s
;
12557 h
->root
.u
.undef
.section
= (asection
*) 0 - 1;
12562 /* COOKIE->rel describes a relocation against section SEC, which is
12563 a section we've decided to keep. Return the section that contains
12564 the relocation symbol, or NULL if no section contains it. */
12567 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
12568 elf_gc_mark_hook_fn gc_mark_hook
,
12569 struct elf_reloc_cookie
*cookie
,
12570 bfd_boolean
*start_stop
)
12572 unsigned long r_symndx
;
12573 struct elf_link_hash_entry
*h
;
12575 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
12576 if (r_symndx
== STN_UNDEF
)
12579 if (r_symndx
>= cookie
->locsymcount
12580 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
12582 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
12585 info
->callbacks
->einfo (_("%F%P: corrupt input: %B\n"),
12589 while (h
->root
.type
== bfd_link_hash_indirect
12590 || h
->root
.type
== bfd_link_hash_warning
)
12591 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12593 /* If this symbol is weak and there is a non-weak definition, we
12594 keep the non-weak definition because many backends put
12595 dynamic reloc info on the non-weak definition for code
12596 handling copy relocs. */
12597 if (h
->u
.weakdef
!= NULL
)
12598 h
->u
.weakdef
->mark
= 1;
12600 if (start_stop
!= NULL
)
12602 /* To work around a glibc bug, mark all XXX input sections
12603 when there is an as yet undefined reference to __start_XXX
12604 or __stop_XXX symbols. The linker will later define such
12605 symbols for orphan input sections that have a name
12606 representable as a C identifier. */
12607 asection
*s
= _bfd_elf_is_start_stop (info
, h
);
12611 *start_stop
= !s
->gc_mark
;
12616 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
12619 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
12620 &cookie
->locsyms
[r_symndx
]);
12623 /* COOKIE->rel describes a relocation against section SEC, which is
12624 a section we've decided to keep. Mark the section that contains
12625 the relocation symbol. */
12628 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
12630 elf_gc_mark_hook_fn gc_mark_hook
,
12631 struct elf_reloc_cookie
*cookie
)
12634 bfd_boolean start_stop
= FALSE
;
12636 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
12637 while (rsec
!= NULL
)
12639 if (!rsec
->gc_mark
)
12641 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
12642 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
12644 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
12649 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
12654 /* The mark phase of garbage collection. For a given section, mark
12655 it and any sections in this section's group, and all the sections
12656 which define symbols to which it refers. */
12659 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
12661 elf_gc_mark_hook_fn gc_mark_hook
)
12664 asection
*group_sec
, *eh_frame
;
12668 /* Mark all the sections in the group. */
12669 group_sec
= elf_section_data (sec
)->next_in_group
;
12670 if (group_sec
&& !group_sec
->gc_mark
)
12671 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
12674 /* Look through the section relocs. */
12676 eh_frame
= elf_eh_frame_section (sec
->owner
);
12677 if ((sec
->flags
& SEC_RELOC
) != 0
12678 && sec
->reloc_count
> 0
12679 && sec
!= eh_frame
)
12681 struct elf_reloc_cookie cookie
;
12683 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
12687 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
12688 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
12693 fini_reloc_cookie_for_section (&cookie
, sec
);
12697 if (ret
&& eh_frame
&& elf_fde_list (sec
))
12699 struct elf_reloc_cookie cookie
;
12701 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
12705 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
12706 gc_mark_hook
, &cookie
))
12708 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
12712 eh_frame
= elf_section_eh_frame_entry (sec
);
12713 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
12714 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
12720 /* Scan and mark sections in a special or debug section group. */
12723 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
12725 /* Point to first section of section group. */
12727 /* Used to iterate the section group. */
12730 bfd_boolean is_special_grp
= TRUE
;
12731 bfd_boolean is_debug_grp
= TRUE
;
12733 /* First scan to see if group contains any section other than debug
12734 and special section. */
12735 ssec
= msec
= elf_next_in_group (grp
);
12738 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
12739 is_debug_grp
= FALSE
;
12741 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
12742 is_special_grp
= FALSE
;
12744 msec
= elf_next_in_group (msec
);
12746 while (msec
!= ssec
);
12748 /* If this is a pure debug section group or pure special section group,
12749 keep all sections in this group. */
12750 if (is_debug_grp
|| is_special_grp
)
12755 msec
= elf_next_in_group (msec
);
12757 while (msec
!= ssec
);
12761 /* Keep debug and special sections. */
12764 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
12765 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED
)
12769 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
12772 bfd_boolean some_kept
;
12773 bfd_boolean debug_frag_seen
;
12775 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
12778 /* Ensure all linker created sections are kept,
12779 see if any other section is already marked,
12780 and note if we have any fragmented debug sections. */
12781 debug_frag_seen
= some_kept
= FALSE
;
12782 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
12784 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
12786 else if (isec
->gc_mark
)
12789 if (debug_frag_seen
== FALSE
12790 && (isec
->flags
& SEC_DEBUGGING
)
12791 && CONST_STRNEQ (isec
->name
, ".debug_line."))
12792 debug_frag_seen
= TRUE
;
12795 /* If no section in this file will be kept, then we can
12796 toss out the debug and special sections. */
12800 /* Keep debug and special sections like .comment when they are
12801 not part of a group. Also keep section groups that contain
12802 just debug sections or special sections. */
12803 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
12805 if ((isec
->flags
& SEC_GROUP
) != 0)
12806 _bfd_elf_gc_mark_debug_special_section_group (isec
);
12807 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
12808 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
12809 && elf_next_in_group (isec
) == NULL
)
12813 if (! debug_frag_seen
)
12816 /* Look for CODE sections which are going to be discarded,
12817 and find and discard any fragmented debug sections which
12818 are associated with that code section. */
12819 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
12820 if ((isec
->flags
& SEC_CODE
) != 0
12821 && isec
->gc_mark
== 0)
12826 ilen
= strlen (isec
->name
);
12828 /* Association is determined by the name of the debug section
12829 containing the name of the code section as a suffix. For
12830 example .debug_line.text.foo is a debug section associated
12832 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
12836 if (dsec
->gc_mark
== 0
12837 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
12840 dlen
= strlen (dsec
->name
);
12843 && strncmp (dsec
->name
+ (dlen
- ilen
),
12844 isec
->name
, ilen
) == 0)
12854 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12856 struct elf_gc_sweep_symbol_info
12858 struct bfd_link_info
*info
;
12859 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
12864 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
12867 && (((h
->root
.type
== bfd_link_hash_defined
12868 || h
->root
.type
== bfd_link_hash_defweak
)
12869 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
12870 && h
->root
.u
.def
.section
->gc_mark
))
12871 || h
->root
.type
== bfd_link_hash_undefined
12872 || h
->root
.type
== bfd_link_hash_undefweak
))
12874 struct elf_gc_sweep_symbol_info
*inf
;
12876 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
12877 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
12878 h
->def_regular
= 0;
12879 h
->ref_regular
= 0;
12880 h
->ref_regular_nonweak
= 0;
12886 /* The sweep phase of garbage collection. Remove all garbage sections. */
12888 typedef bfd_boolean (*gc_sweep_hook_fn
)
12889 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
12892 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
12895 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12896 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
12897 unsigned long section_sym_count
;
12898 struct elf_gc_sweep_symbol_info sweep_info
;
12900 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12904 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
12905 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
12908 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
12910 /* When any section in a section group is kept, we keep all
12911 sections in the section group. If the first member of
12912 the section group is excluded, we will also exclude the
12914 if (o
->flags
& SEC_GROUP
)
12916 asection
*first
= elf_next_in_group (o
);
12917 o
->gc_mark
= first
->gc_mark
;
12923 /* Skip sweeping sections already excluded. */
12924 if (o
->flags
& SEC_EXCLUDE
)
12927 /* Since this is early in the link process, it is simple
12928 to remove a section from the output. */
12929 o
->flags
|= SEC_EXCLUDE
;
12931 if (info
->print_gc_sections
&& o
->size
!= 0)
12932 /* xgettext:c-format */
12933 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
12935 /* But we also have to update some of the relocation
12936 info we collected before. */
12938 && (o
->flags
& SEC_RELOC
) != 0
12939 && o
->reloc_count
!= 0
12940 && !((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
12941 && (o
->flags
& SEC_DEBUGGING
) != 0)
12942 && !bfd_is_abs_section (o
->output_section
))
12944 Elf_Internal_Rela
*internal_relocs
;
12948 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
12949 info
->keep_memory
);
12950 if (internal_relocs
== NULL
)
12953 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
12955 if (elf_section_data (o
)->relocs
!= internal_relocs
)
12956 free (internal_relocs
);
12964 /* Remove the symbols that were in the swept sections from the dynamic
12965 symbol table. GCFIXME: Anyone know how to get them out of the
12966 static symbol table as well? */
12967 sweep_info
.info
= info
;
12968 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
12969 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
12972 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
12976 /* Propagate collected vtable information. This is called through
12977 elf_link_hash_traverse. */
12980 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
12982 /* Those that are not vtables. */
12983 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
12986 /* Those vtables that do not have parents, we cannot merge. */
12987 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
12990 /* If we've already been done, exit. */
12991 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
12994 /* Make sure the parent's table is up to date. */
12995 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
12997 if (h
->vtable
->used
== NULL
)
12999 /* None of this table's entries were referenced. Re-use the
13001 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
13002 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
13007 bfd_boolean
*cu
, *pu
;
13009 /* Or the parent's entries into ours. */
13010 cu
= h
->vtable
->used
;
13012 pu
= h
->vtable
->parent
->vtable
->used
;
13015 const struct elf_backend_data
*bed
;
13016 unsigned int log_file_align
;
13018 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13019 log_file_align
= bed
->s
->log_file_align
;
13020 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
13035 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13038 bfd_vma hstart
, hend
;
13039 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13040 const struct elf_backend_data
*bed
;
13041 unsigned int log_file_align
;
13043 /* Take care of both those symbols that do not describe vtables as
13044 well as those that are not loaded. */
13045 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
13048 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13049 || h
->root
.type
== bfd_link_hash_defweak
);
13051 sec
= h
->root
.u
.def
.section
;
13052 hstart
= h
->root
.u
.def
.value
;
13053 hend
= hstart
+ h
->size
;
13055 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
13057 return *(bfd_boolean
*) okp
= FALSE
;
13058 bed
= get_elf_backend_data (sec
->owner
);
13059 log_file_align
= bed
->s
->log_file_align
;
13061 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
13063 for (rel
= relstart
; rel
< relend
; ++rel
)
13064 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13066 /* If the entry is in use, do nothing. */
13067 if (h
->vtable
->used
13068 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
13070 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13071 if (h
->vtable
->used
[entry
])
13074 /* Otherwise, kill it. */
13075 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13081 /* Mark sections containing dynamically referenced symbols. When
13082 building shared libraries, we must assume that any visible symbol is
13086 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13088 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13089 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13091 if ((h
->root
.type
== bfd_link_hash_defined
13092 || h
->root
.type
== bfd_link_hash_defweak
)
13094 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13095 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13096 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13097 && (!bfd_link_executable (info
)
13098 || info
->gc_keep_exported
13099 || info
->export_dynamic
13102 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13103 && (h
->versioned
>= versioned
13104 || !bfd_hide_sym_by_version (info
->version_info
,
13105 h
->root
.root
.string
)))))
13106 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13111 /* Keep all sections containing symbols undefined on the command-line,
13112 and the section containing the entry symbol. */
13115 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13117 struct bfd_sym_chain
*sym
;
13119 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13121 struct elf_link_hash_entry
*h
;
13123 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13124 FALSE
, FALSE
, FALSE
);
13127 && (h
->root
.type
== bfd_link_hash_defined
13128 || h
->root
.type
== bfd_link_hash_defweak
)
13129 && !bfd_is_abs_section (h
->root
.u
.def
.section
)
13130 && !bfd_is_und_section (h
->root
.u
.def
.section
))
13131 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13136 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13137 struct bfd_link_info
*info
)
13139 bfd
*ibfd
= info
->input_bfds
;
13141 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13144 struct elf_reloc_cookie cookie
;
13146 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13149 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
13152 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
13154 if (CONST_STRNEQ (bfd_section_name (ibfd
, sec
), ".eh_frame_entry")
13155 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
13157 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
13158 fini_reloc_cookie_rels (&cookie
, sec
);
13165 /* Do mark and sweep of unused sections. */
13168 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
13170 bfd_boolean ok
= TRUE
;
13172 elf_gc_mark_hook_fn gc_mark_hook
;
13173 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13174 struct elf_link_hash_table
*htab
;
13176 if (!bed
->can_gc_sections
13177 || !is_elf_hash_table (info
->hash
))
13179 _bfd_error_handler(_("Warning: gc-sections option ignored"));
13183 bed
->gc_keep (info
);
13184 htab
= elf_hash_table (info
);
13186 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
13187 at the .eh_frame section if we can mark the FDEs individually. */
13188 for (sub
= info
->input_bfds
;
13189 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
13190 sub
= sub
->link
.next
)
13193 struct elf_reloc_cookie cookie
;
13195 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
13196 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
13198 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
13199 if (elf_section_data (sec
)->sec_info
13200 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
13201 elf_eh_frame_section (sub
) = sec
;
13202 fini_reloc_cookie_for_section (&cookie
, sec
);
13203 sec
= bfd_get_next_section_by_name (NULL
, sec
);
13207 /* Apply transitive closure to the vtable entry usage info. */
13208 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
13212 /* Kill the vtable relocations that were not used. */
13213 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
13217 /* Mark dynamically referenced symbols. */
13218 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
13219 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
13221 /* Grovel through relocs to find out who stays ... */
13222 gc_mark_hook
= bed
->gc_mark_hook
;
13223 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13227 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13228 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13231 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
13232 Also treat note sections as a root, if the section is not part
13234 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13236 && (o
->flags
& SEC_EXCLUDE
) == 0
13237 && ((o
->flags
& SEC_KEEP
) != 0
13238 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
13239 && elf_next_in_group (o
) == NULL
)))
13241 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
13246 /* Allow the backend to mark additional target specific sections. */
13247 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
13249 /* ... and mark SEC_EXCLUDE for those that go. */
13250 return elf_gc_sweep (abfd
, info
);
13253 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
13256 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
13258 struct elf_link_hash_entry
*h
,
13261 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
13262 struct elf_link_hash_entry
**search
, *child
;
13263 size_t extsymcount
;
13264 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13266 /* The sh_info field of the symtab header tells us where the
13267 external symbols start. We don't care about the local symbols at
13269 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
13270 if (!elf_bad_symtab (abfd
))
13271 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
13273 sym_hashes
= elf_sym_hashes (abfd
);
13274 sym_hashes_end
= sym_hashes
+ extsymcount
;
13276 /* Hunt down the child symbol, which is in this section at the same
13277 offset as the relocation. */
13278 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
13280 if ((child
= *search
) != NULL
13281 && (child
->root
.type
== bfd_link_hash_defined
13282 || child
->root
.type
== bfd_link_hash_defweak
)
13283 && child
->root
.u
.def
.section
== sec
13284 && child
->root
.u
.def
.value
== offset
)
13288 /* xgettext:c-format */
13289 _bfd_error_handler (_("%B: %A+%lu: No symbol found for INHERIT"),
13290 abfd
, sec
, (unsigned long) offset
);
13291 bfd_set_error (bfd_error_invalid_operation
);
13295 if (!child
->vtable
)
13297 child
->vtable
= ((struct elf_link_virtual_table_entry
*)
13298 bfd_zalloc (abfd
, sizeof (*child
->vtable
)));
13299 if (!child
->vtable
)
13304 /* This *should* only be the absolute section. It could potentially
13305 be that someone has defined a non-global vtable though, which
13306 would be bad. It isn't worth paging in the local symbols to be
13307 sure though; that case should simply be handled by the assembler. */
13309 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
13312 child
->vtable
->parent
= h
;
13317 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13320 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
13321 asection
*sec ATTRIBUTE_UNUSED
,
13322 struct elf_link_hash_entry
*h
,
13325 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13326 unsigned int log_file_align
= bed
->s
->log_file_align
;
13330 h
->vtable
= ((struct elf_link_virtual_table_entry
*)
13331 bfd_zalloc (abfd
, sizeof (*h
->vtable
)));
13336 if (addend
>= h
->vtable
->size
)
13338 size_t size
, bytes
, file_align
;
13339 bfd_boolean
*ptr
= h
->vtable
->used
;
13341 /* While the symbol is undefined, we have to be prepared to handle
13343 file_align
= 1 << log_file_align
;
13344 if (h
->root
.type
== bfd_link_hash_undefined
)
13345 size
= addend
+ file_align
;
13349 if (addend
>= size
)
13351 /* Oops! We've got a reference past the defined end of
13352 the table. This is probably a bug -- shall we warn? */
13353 size
= addend
+ file_align
;
13356 size
= (size
+ file_align
- 1) & -file_align
;
13358 /* Allocate one extra entry for use as a "done" flag for the
13359 consolidation pass. */
13360 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
13364 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
13370 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
13371 * sizeof (bfd_boolean
));
13372 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
13376 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
13381 /* And arrange for that done flag to be at index -1. */
13382 h
->vtable
->used
= ptr
+ 1;
13383 h
->vtable
->size
= size
;
13386 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
13391 /* Map an ELF section header flag to its corresponding string. */
13395 flagword flag_value
;
13396 } elf_flags_to_name_table
;
13398 static elf_flags_to_name_table elf_flags_to_names
[] =
13400 { "SHF_WRITE", SHF_WRITE
},
13401 { "SHF_ALLOC", SHF_ALLOC
},
13402 { "SHF_EXECINSTR", SHF_EXECINSTR
},
13403 { "SHF_MERGE", SHF_MERGE
},
13404 { "SHF_STRINGS", SHF_STRINGS
},
13405 { "SHF_INFO_LINK", SHF_INFO_LINK
},
13406 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
13407 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
13408 { "SHF_GROUP", SHF_GROUP
},
13409 { "SHF_TLS", SHF_TLS
},
13410 { "SHF_MASKOS", SHF_MASKOS
},
13411 { "SHF_EXCLUDE", SHF_EXCLUDE
},
13414 /* Returns TRUE if the section is to be included, otherwise FALSE. */
13416 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
13417 struct flag_info
*flaginfo
,
13420 const bfd_vma sh_flags
= elf_section_flags (section
);
13422 if (!flaginfo
->flags_initialized
)
13424 bfd
*obfd
= info
->output_bfd
;
13425 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
13426 struct flag_info_list
*tf
= flaginfo
->flag_list
;
13428 int without_hex
= 0;
13430 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
13433 flagword (*lookup
) (char *);
13435 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
13436 if (lookup
!= NULL
)
13438 flagword hexval
= (*lookup
) ((char *) tf
->name
);
13442 if (tf
->with
== with_flags
)
13443 with_hex
|= hexval
;
13444 else if (tf
->with
== without_flags
)
13445 without_hex
|= hexval
;
13450 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
13452 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
13454 if (tf
->with
== with_flags
)
13455 with_hex
|= elf_flags_to_names
[i
].flag_value
;
13456 else if (tf
->with
== without_flags
)
13457 without_hex
|= elf_flags_to_names
[i
].flag_value
;
13464 info
->callbacks
->einfo
13465 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
13469 flaginfo
->flags_initialized
= TRUE
;
13470 flaginfo
->only_with_flags
|= with_hex
;
13471 flaginfo
->not_with_flags
|= without_hex
;
13474 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
13477 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
13483 struct alloc_got_off_arg
{
13485 struct bfd_link_info
*info
;
13488 /* We need a special top-level link routine to convert got reference counts
13489 to real got offsets. */
13492 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
13494 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
13495 bfd
*obfd
= gofarg
->info
->output_bfd
;
13496 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
13498 if (h
->got
.refcount
> 0)
13500 h
->got
.offset
= gofarg
->gotoff
;
13501 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
13504 h
->got
.offset
= (bfd_vma
) -1;
13509 /* And an accompanying bit to work out final got entry offsets once
13510 we're done. Should be called from final_link. */
13513 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
13514 struct bfd_link_info
*info
)
13517 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13519 struct alloc_got_off_arg gofarg
;
13521 BFD_ASSERT (abfd
== info
->output_bfd
);
13523 if (! is_elf_hash_table (info
->hash
))
13526 /* The GOT offset is relative to the .got section, but the GOT header is
13527 put into the .got.plt section, if the backend uses it. */
13528 if (bed
->want_got_plt
)
13531 gotoff
= bed
->got_header_size
;
13533 /* Do the local .got entries first. */
13534 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
13536 bfd_signed_vma
*local_got
;
13537 size_t j
, locsymcount
;
13538 Elf_Internal_Shdr
*symtab_hdr
;
13540 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
13543 local_got
= elf_local_got_refcounts (i
);
13547 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
13548 if (elf_bad_symtab (i
))
13549 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13551 locsymcount
= symtab_hdr
->sh_info
;
13553 for (j
= 0; j
< locsymcount
; ++j
)
13555 if (local_got
[j
] > 0)
13557 local_got
[j
] = gotoff
;
13558 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
13561 local_got
[j
] = (bfd_vma
) -1;
13565 /* Then the global .got entries. .plt refcounts are handled by
13566 adjust_dynamic_symbol */
13567 gofarg
.gotoff
= gotoff
;
13568 gofarg
.info
= info
;
13569 elf_link_hash_traverse (elf_hash_table (info
),
13570 elf_gc_allocate_got_offsets
,
13575 /* Many folk need no more in the way of final link than this, once
13576 got entry reference counting is enabled. */
13579 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
13581 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
13584 /* Invoke the regular ELF backend linker to do all the work. */
13585 return bfd_elf_final_link (abfd
, info
);
13589 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
13591 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
13593 if (rcookie
->bad_symtab
)
13594 rcookie
->rel
= rcookie
->rels
;
13596 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
13598 unsigned long r_symndx
;
13600 if (! rcookie
->bad_symtab
)
13601 if (rcookie
->rel
->r_offset
> offset
)
13603 if (rcookie
->rel
->r_offset
!= offset
)
13606 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
13607 if (r_symndx
== STN_UNDEF
)
13610 if (r_symndx
>= rcookie
->locsymcount
13611 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13613 struct elf_link_hash_entry
*h
;
13615 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
13617 while (h
->root
.type
== bfd_link_hash_indirect
13618 || h
->root
.type
== bfd_link_hash_warning
)
13619 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13621 if ((h
->root
.type
== bfd_link_hash_defined
13622 || h
->root
.type
== bfd_link_hash_defweak
)
13623 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
13624 || h
->root
.u
.def
.section
->kept_section
!= NULL
13625 || discarded_section (h
->root
.u
.def
.section
)))
13630 /* It's not a relocation against a global symbol,
13631 but it could be a relocation against a local
13632 symbol for a discarded section. */
13634 Elf_Internal_Sym
*isym
;
13636 /* Need to: get the symbol; get the section. */
13637 isym
= &rcookie
->locsyms
[r_symndx
];
13638 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
13640 && (isec
->kept_section
!= NULL
13641 || discarded_section (isec
)))
13649 /* Discard unneeded references to discarded sections.
13650 Returns -1 on error, 1 if any section's size was changed, 0 if
13651 nothing changed. This function assumes that the relocations are in
13652 sorted order, which is true for all known assemblers. */
13655 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
13657 struct elf_reloc_cookie cookie
;
13662 if (info
->traditional_format
13663 || !is_elf_hash_table (info
->hash
))
13666 o
= bfd_get_section_by_name (output_bfd
, ".stab");
13671 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
13674 || i
->reloc_count
== 0
13675 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
13679 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
13682 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
13685 if (_bfd_discard_section_stabs (abfd
, i
,
13686 elf_section_data (i
)->sec_info
,
13687 bfd_elf_reloc_symbol_deleted_p
,
13691 fini_reloc_cookie_for_section (&cookie
, i
);
13696 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
13697 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
13702 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
13708 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
13711 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
13714 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
13715 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
13716 bfd_elf_reloc_symbol_deleted_p
,
13720 fini_reloc_cookie_for_section (&cookie
, i
);
13724 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
13726 const struct elf_backend_data
*bed
;
13728 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
13731 bed
= get_elf_backend_data (abfd
);
13733 if (bed
->elf_backend_discard_info
!= NULL
)
13735 if (!init_reloc_cookie (&cookie
, info
, abfd
))
13738 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
13741 fini_reloc_cookie (&cookie
, abfd
);
13745 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
13746 _bfd_elf_end_eh_frame_parsing (info
);
13748 if (info
->eh_frame_hdr_type
13749 && !bfd_link_relocatable (info
)
13750 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
13757 _bfd_elf_section_already_linked (bfd
*abfd
,
13759 struct bfd_link_info
*info
)
13762 const char *name
, *key
;
13763 struct bfd_section_already_linked
*l
;
13764 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
13766 if (sec
->output_section
== bfd_abs_section_ptr
)
13769 flags
= sec
->flags
;
13771 /* Return if it isn't a linkonce section. A comdat group section
13772 also has SEC_LINK_ONCE set. */
13773 if ((flags
& SEC_LINK_ONCE
) == 0)
13776 /* Don't put group member sections on our list of already linked
13777 sections. They are handled as a group via their group section. */
13778 if (elf_sec_group (sec
) != NULL
)
13781 /* For a SHT_GROUP section, use the group signature as the key. */
13783 if ((flags
& SEC_GROUP
) != 0
13784 && elf_next_in_group (sec
) != NULL
13785 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
13786 key
= elf_group_name (elf_next_in_group (sec
));
13789 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13790 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
13791 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
13794 /* Must be a user linkonce section that doesn't follow gcc's
13795 naming convention. In this case we won't be matching
13796 single member groups. */
13800 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
13802 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
13804 /* We may have 2 different types of sections on the list: group
13805 sections with a signature of <key> (<key> is some string),
13806 and linkonce sections named .gnu.linkonce.<type>.<key>.
13807 Match like sections. LTO plugin sections are an exception.
13808 They are always named .gnu.linkonce.t.<key> and match either
13809 type of section. */
13810 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
13811 && ((flags
& SEC_GROUP
) != 0
13812 || strcmp (name
, l
->sec
->name
) == 0))
13813 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0)
13815 /* The section has already been linked. See if we should
13816 issue a warning. */
13817 if (!_bfd_handle_already_linked (sec
, l
, info
))
13820 if (flags
& SEC_GROUP
)
13822 asection
*first
= elf_next_in_group (sec
);
13823 asection
*s
= first
;
13827 s
->output_section
= bfd_abs_section_ptr
;
13828 /* Record which group discards it. */
13829 s
->kept_section
= l
->sec
;
13830 s
= elf_next_in_group (s
);
13831 /* These lists are circular. */
13841 /* A single member comdat group section may be discarded by a
13842 linkonce section and vice versa. */
13843 if ((flags
& SEC_GROUP
) != 0)
13845 asection
*first
= elf_next_in_group (sec
);
13847 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
13848 /* Check this single member group against linkonce sections. */
13849 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
13850 if ((l
->sec
->flags
& SEC_GROUP
) == 0
13851 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
13853 first
->output_section
= bfd_abs_section_ptr
;
13854 first
->kept_section
= l
->sec
;
13855 sec
->output_section
= bfd_abs_section_ptr
;
13860 /* Check this linkonce section against single member groups. */
13861 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
13862 if (l
->sec
->flags
& SEC_GROUP
)
13864 asection
*first
= elf_next_in_group (l
->sec
);
13867 && elf_next_in_group (first
) == first
13868 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
13870 sec
->output_section
= bfd_abs_section_ptr
;
13871 sec
->kept_section
= first
;
13876 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13877 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13878 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13879 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13880 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13881 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13882 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13883 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13884 The reverse order cannot happen as there is never a bfd with only the
13885 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13886 matter as here were are looking only for cross-bfd sections. */
13888 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
13889 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
13890 if ((l
->sec
->flags
& SEC_GROUP
) == 0
13891 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
13893 if (abfd
!= l
->sec
->owner
)
13894 sec
->output_section
= bfd_abs_section_ptr
;
13898 /* This is the first section with this name. Record it. */
13899 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
13900 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
13901 return sec
->output_section
== bfd_abs_section_ptr
;
13905 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
13907 return sym
->st_shndx
== SHN_COMMON
;
13911 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
13917 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
13919 return bfd_com_section_ptr
;
13923 _bfd_elf_default_got_elt_size (bfd
*abfd
,
13924 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13925 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
13926 bfd
*ibfd ATTRIBUTE_UNUSED
,
13927 unsigned long symndx ATTRIBUTE_UNUSED
)
13929 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13930 return bed
->s
->arch_size
/ 8;
13933 /* Routines to support the creation of dynamic relocs. */
13935 /* Returns the name of the dynamic reloc section associated with SEC. */
13937 static const char *
13938 get_dynamic_reloc_section_name (bfd
* abfd
,
13940 bfd_boolean is_rela
)
13943 const char *old_name
= bfd_get_section_name (NULL
, sec
);
13944 const char *prefix
= is_rela
? ".rela" : ".rel";
13946 if (old_name
== NULL
)
13949 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
13950 sprintf (name
, "%s%s", prefix
, old_name
);
13955 /* Returns the dynamic reloc section associated with SEC.
13956 If necessary compute the name of the dynamic reloc section based
13957 on SEC's name (looked up in ABFD's string table) and the setting
13961 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
13963 bfd_boolean is_rela
)
13965 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
13967 if (reloc_sec
== NULL
)
13969 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
13973 reloc_sec
= bfd_get_linker_section (abfd
, name
);
13975 if (reloc_sec
!= NULL
)
13976 elf_section_data (sec
)->sreloc
= reloc_sec
;
13983 /* Returns the dynamic reloc section associated with SEC. If the
13984 section does not exist it is created and attached to the DYNOBJ
13985 bfd and stored in the SRELOC field of SEC's elf_section_data
13988 ALIGNMENT is the alignment for the newly created section and
13989 IS_RELA defines whether the name should be .rela.<SEC's name>
13990 or .rel.<SEC's name>. The section name is looked up in the
13991 string table associated with ABFD. */
13994 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
13996 unsigned int alignment
,
13998 bfd_boolean is_rela
)
14000 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14002 if (reloc_sec
== NULL
)
14004 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14009 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14011 if (reloc_sec
== NULL
)
14013 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14014 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14015 if ((sec
->flags
& SEC_ALLOC
) != 0)
14016 flags
|= SEC_ALLOC
| SEC_LOAD
;
14018 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14019 if (reloc_sec
!= NULL
)
14021 /* _bfd_elf_get_sec_type_attr chooses a section type by
14022 name. Override as it may be wrong, eg. for a user
14023 section named "auto" we'll get ".relauto" which is
14024 seen to be a .rela section. */
14025 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14026 if (! bfd_set_section_alignment (dynobj
, reloc_sec
, alignment
))
14031 elf_section_data (sec
)->sreloc
= reloc_sec
;
14037 /* Copy the ELF symbol type and other attributes for a linker script
14038 assignment from HSRC to HDEST. Generally this should be treated as
14039 if we found a strong non-dynamic definition for HDEST (except that
14040 ld ignores multiple definition errors). */
14042 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14043 struct bfd_link_hash_entry
*hdest
,
14044 struct bfd_link_hash_entry
*hsrc
)
14046 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14047 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14048 Elf_Internal_Sym isym
;
14050 ehdest
->type
= ehsrc
->type
;
14051 ehdest
->target_internal
= ehsrc
->target_internal
;
14053 isym
.st_other
= ehsrc
->other
;
14054 elf_merge_st_other (abfd
, ehdest
, &isym
, NULL
, TRUE
, FALSE
);
14057 /* Append a RELA relocation REL to section S in BFD. */
14060 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14062 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14063 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14064 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14065 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14068 /* Append a REL relocation REL to section S in BFD. */
14071 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14073 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14074 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14075 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
14076 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);