1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2021 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
30 #if BFD_SUPPORTS_PLUGINS
31 #include "plugin-api.h"
42 /* This struct is used to pass information to routines called via
43 elf_link_hash_traverse which must return failure. */
45 struct elf_info_failed
47 struct bfd_link_info
*info
;
51 /* This structure is used to pass information to
52 _bfd_elf_link_find_version_dependencies. */
54 struct elf_find_verdep_info
56 /* General link information. */
57 struct bfd_link_info
*info
;
58 /* The number of dependencies. */
60 /* Whether we had a failure. */
64 static bfd_boolean _bfd_elf_fix_symbol_flags
65 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
68 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
69 unsigned long r_symndx
,
72 if (r_symndx
>= cookie
->locsymcount
73 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
75 struct elf_link_hash_entry
*h
;
77 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
79 while (h
->root
.type
== bfd_link_hash_indirect
80 || h
->root
.type
== bfd_link_hash_warning
)
81 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
83 if ((h
->root
.type
== bfd_link_hash_defined
84 || h
->root
.type
== bfd_link_hash_defweak
)
85 && discarded_section (h
->root
.u
.def
.section
))
86 return h
->root
.u
.def
.section
;
92 /* It's not a relocation against a global symbol,
93 but it could be a relocation against a local
94 symbol for a discarded section. */
96 Elf_Internal_Sym
*isym
;
98 /* Need to: get the symbol; get the section. */
99 isym
= &cookie
->locsyms
[r_symndx
];
100 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
102 && discard
? discarded_section (isec
) : 1)
108 /* Define a symbol in a dynamic linkage section. */
110 struct elf_link_hash_entry
*
111 _bfd_elf_define_linkage_sym (bfd
*abfd
,
112 struct bfd_link_info
*info
,
116 struct elf_link_hash_entry
*h
;
117 struct bfd_link_hash_entry
*bh
;
118 const struct elf_backend_data
*bed
;
120 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
123 /* Zap symbol defined in an as-needed lib that wasn't linked.
124 This is a symptom of a larger problem: Absolute symbols
125 defined in shared libraries can't be overridden, because we
126 lose the link to the bfd which is via the symbol section. */
127 h
->root
.type
= bfd_link_hash_new
;
133 bed
= get_elf_backend_data (abfd
);
134 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
135 sec
, 0, NULL
, FALSE
, bed
->collect
,
138 h
= (struct elf_link_hash_entry
*) bh
;
139 BFD_ASSERT (h
!= NULL
);
142 h
->root
.linker_def
= 1;
143 h
->type
= STT_OBJECT
;
144 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
145 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
147 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
152 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
156 struct elf_link_hash_entry
*h
;
157 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
158 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
160 /* This function may be called more than once. */
161 if (htab
->sgot
!= NULL
)
164 flags
= bed
->dynamic_sec_flags
;
166 s
= bfd_make_section_anyway_with_flags (abfd
,
167 (bed
->rela_plts_and_copies_p
168 ? ".rela.got" : ".rel.got"),
169 (bed
->dynamic_sec_flags
172 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
176 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
178 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
182 if (bed
->want_got_plt
)
184 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
186 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
191 /* The first bit of the global offset table is the header. */
192 s
->size
+= bed
->got_header_size
;
194 if (bed
->want_got_sym
)
196 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
197 (or .got.plt) section. We don't do this in the linker script
198 because we don't want to define the symbol if we are not creating
199 a global offset table. */
200 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
201 "_GLOBAL_OFFSET_TABLE_");
202 elf_hash_table (info
)->hgot
= h
;
210 /* Create a strtab to hold the dynamic symbol names. */
212 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
214 struct elf_link_hash_table
*hash_table
;
216 hash_table
= elf_hash_table (info
);
217 if (hash_table
->dynobj
== NULL
)
219 /* We may not set dynobj, an input file holding linker created
220 dynamic sections to abfd, which may be a dynamic object with
221 its own dynamic sections. We need to find a normal input file
222 to hold linker created sections if possible. */
223 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
227 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
229 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
230 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
231 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
232 && !((s
= ibfd
->sections
) != NULL
233 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
239 hash_table
->dynobj
= abfd
;
242 if (hash_table
->dynstr
== NULL
)
244 hash_table
->dynstr
= _bfd_elf_strtab_init ();
245 if (hash_table
->dynstr
== NULL
)
251 /* Create some sections which will be filled in with dynamic linking
252 information. ABFD is an input file which requires dynamic sections
253 to be created. The dynamic sections take up virtual memory space
254 when the final executable is run, so we need to create them before
255 addresses are assigned to the output sections. We work out the
256 actual contents and size of these sections later. */
259 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
263 const struct elf_backend_data
*bed
;
264 struct elf_link_hash_entry
*h
;
266 if (! is_elf_hash_table (info
->hash
))
269 if (elf_hash_table (info
)->dynamic_sections_created
)
272 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
275 abfd
= elf_hash_table (info
)->dynobj
;
276 bed
= get_elf_backend_data (abfd
);
278 flags
= bed
->dynamic_sec_flags
;
280 /* A dynamically linked executable has a .interp section, but a
281 shared library does not. */
282 if (bfd_link_executable (info
) && !info
->nointerp
)
284 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
285 flags
| SEC_READONLY
);
290 /* Create sections to hold version informations. These are removed
291 if they are not needed. */
292 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
293 flags
| SEC_READONLY
);
295 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
298 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
299 flags
| SEC_READONLY
);
301 || !bfd_set_section_alignment (s
, 1))
304 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
305 flags
| SEC_READONLY
);
307 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
310 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
311 flags
| SEC_READONLY
);
313 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
315 elf_hash_table (info
)->dynsym
= s
;
317 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
318 flags
| SEC_READONLY
);
322 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
324 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
327 /* The special symbol _DYNAMIC is always set to the start of the
328 .dynamic section. We could set _DYNAMIC in a linker script, but we
329 only want to define it if we are, in fact, creating a .dynamic
330 section. We don't want to define it if there is no .dynamic
331 section, since on some ELF platforms the start up code examines it
332 to decide how to initialize the process. */
333 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
334 elf_hash_table (info
)->hdynamic
= h
;
340 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
341 flags
| SEC_READONLY
);
343 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
345 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
348 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
350 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
351 flags
| SEC_READONLY
);
353 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
355 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
356 4 32-bit words followed by variable count of 64-bit words, then
357 variable count of 32-bit words. */
358 if (bed
->s
->arch_size
== 64)
359 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
361 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
364 /* Let the backend create the rest of the sections. This lets the
365 backend set the right flags. The backend will normally create
366 the .got and .plt sections. */
367 if (bed
->elf_backend_create_dynamic_sections
== NULL
368 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
371 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
376 /* Create dynamic sections when linking against a dynamic object. */
379 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
381 flagword flags
, pltflags
;
382 struct elf_link_hash_entry
*h
;
384 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
385 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
387 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
388 .rel[a].bss sections. */
389 flags
= bed
->dynamic_sec_flags
;
392 if (bed
->plt_not_loaded
)
393 /* We do not clear SEC_ALLOC here because we still want the OS to
394 allocate space for the section; it's just that there's nothing
395 to read in from the object file. */
396 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
398 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
399 if (bed
->plt_readonly
)
400 pltflags
|= SEC_READONLY
;
402 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
404 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
408 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
410 if (bed
->want_plt_sym
)
412 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
413 "_PROCEDURE_LINKAGE_TABLE_");
414 elf_hash_table (info
)->hplt
= h
;
419 s
= bfd_make_section_anyway_with_flags (abfd
,
420 (bed
->rela_plts_and_copies_p
421 ? ".rela.plt" : ".rel.plt"),
422 flags
| SEC_READONLY
);
424 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
428 if (! _bfd_elf_create_got_section (abfd
, info
))
431 if (bed
->want_dynbss
)
433 /* The .dynbss section is a place to put symbols which are defined
434 by dynamic objects, are referenced by regular objects, and are
435 not functions. We must allocate space for them in the process
436 image and use a R_*_COPY reloc to tell the dynamic linker to
437 initialize them at run time. The linker script puts the .dynbss
438 section into the .bss section of the final image. */
439 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
440 SEC_ALLOC
| SEC_LINKER_CREATED
);
445 if (bed
->want_dynrelro
)
447 /* Similarly, but for symbols that were originally in read-only
448 sections. This section doesn't really need to have contents,
449 but make it like other .data.rel.ro sections. */
450 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
457 /* The .rel[a].bss section holds copy relocs. This section is not
458 normally needed. We need to create it here, though, so that the
459 linker will map it to an output section. We can't just create it
460 only if we need it, because we will not know whether we need it
461 until we have seen all the input files, and the first time the
462 main linker code calls BFD after examining all the input files
463 (size_dynamic_sections) the input sections have already been
464 mapped to the output sections. If the section turns out not to
465 be needed, we can discard it later. We will never need this
466 section when generating a shared object, since they do not use
468 if (bfd_link_executable (info
))
470 s
= bfd_make_section_anyway_with_flags (abfd
,
471 (bed
->rela_plts_and_copies_p
472 ? ".rela.bss" : ".rel.bss"),
473 flags
| SEC_READONLY
);
475 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
479 if (bed
->want_dynrelro
)
481 s
= (bfd_make_section_anyway_with_flags
482 (abfd
, (bed
->rela_plts_and_copies_p
483 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
484 flags
| SEC_READONLY
));
486 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
488 htab
->sreldynrelro
= s
;
496 /* Record a new dynamic symbol. We record the dynamic symbols as we
497 read the input files, since we need to have a list of all of them
498 before we can determine the final sizes of the output sections.
499 Note that we may actually call this function even though we are not
500 going to output any dynamic symbols; in some cases we know that a
501 symbol should be in the dynamic symbol table, but only if there is
505 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
506 struct elf_link_hash_entry
*h
)
508 if (h
->dynindx
== -1)
510 struct elf_strtab_hash
*dynstr
;
515 if (h
->root
.type
== bfd_link_hash_defined
516 || h
->root
.type
== bfd_link_hash_defweak
)
518 /* An IR symbol should not be made dynamic. */
519 if (h
->root
.u
.def
.section
!= NULL
520 && h
->root
.u
.def
.section
->owner
!= NULL
521 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
525 /* XXX: The ABI draft says the linker must turn hidden and
526 internal symbols into STB_LOCAL symbols when producing the
527 DSO. However, if ld.so honors st_other in the dynamic table,
528 this would not be necessary. */
529 switch (ELF_ST_VISIBILITY (h
->other
))
533 if (h
->root
.type
!= bfd_link_hash_undefined
534 && h
->root
.type
!= bfd_link_hash_undefweak
)
537 if (!elf_hash_table (info
)->is_relocatable_executable
538 || ((h
->root
.type
== bfd_link_hash_defined
539 || h
->root
.type
== bfd_link_hash_defweak
)
540 && h
->root
.u
.def
.section
->owner
->no_export
)
541 || (h
->root
.type
== bfd_link_hash_common
542 && h
->root
.u
.c
.p
->section
->owner
->no_export
))
550 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
551 ++elf_hash_table (info
)->dynsymcount
;
553 dynstr
= elf_hash_table (info
)->dynstr
;
556 /* Create a strtab to hold the dynamic symbol names. */
557 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
562 /* We don't put any version information in the dynamic string
564 name
= h
->root
.root
.string
;
565 p
= strchr (name
, ELF_VER_CHR
);
567 /* We know that the p points into writable memory. In fact,
568 there are only a few symbols that have read-only names, being
569 those like _GLOBAL_OFFSET_TABLE_ that are created specially
570 by the backends. Most symbols will have names pointing into
571 an ELF string table read from a file, or to objalloc memory. */
574 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
579 if (indx
== (size_t) -1)
581 h
->dynstr_index
= indx
;
587 /* Mark a symbol dynamic. */
590 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
591 struct elf_link_hash_entry
*h
,
592 Elf_Internal_Sym
*sym
)
594 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
596 /* It may be called more than once on the same H. */
597 if(h
->dynamic
|| bfd_link_relocatable (info
))
600 if ((info
->dynamic_data
601 && (h
->type
== STT_OBJECT
602 || h
->type
== STT_COMMON
604 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
605 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
608 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
611 /* NB: If a symbol is made dynamic by --dynamic-list, it has
613 h
->root
.non_ir_ref_dynamic
= 1;
617 /* Record an assignment to a symbol made by a linker script. We need
618 this in case some dynamic object refers to this symbol. */
621 bfd_elf_record_link_assignment (bfd
*output_bfd
,
622 struct bfd_link_info
*info
,
627 struct elf_link_hash_entry
*h
, *hv
;
628 struct elf_link_hash_table
*htab
;
629 const struct elf_backend_data
*bed
;
631 if (!is_elf_hash_table (info
->hash
))
634 htab
= elf_hash_table (info
);
635 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
639 if (h
->root
.type
== bfd_link_hash_warning
)
640 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
642 if (h
->versioned
== unknown
)
644 /* Set versioned if symbol version is unknown. */
645 char *version
= strrchr (name
, ELF_VER_CHR
);
648 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
649 h
->versioned
= versioned_hidden
;
651 h
->versioned
= versioned
;
655 /* Symbols defined in a linker script but not referenced anywhere
656 else will have non_elf set. */
659 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
663 switch (h
->root
.type
)
665 case bfd_link_hash_defined
:
666 case bfd_link_hash_defweak
:
667 case bfd_link_hash_common
:
669 case bfd_link_hash_undefweak
:
670 case bfd_link_hash_undefined
:
671 /* Since we're defining the symbol, don't let it seem to have not
672 been defined. record_dynamic_symbol and size_dynamic_sections
673 may depend on this. */
674 h
->root
.type
= bfd_link_hash_new
;
675 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
676 bfd_link_repair_undef_list (&htab
->root
);
678 case bfd_link_hash_new
:
680 case bfd_link_hash_indirect
:
681 /* We had a versioned symbol in a dynamic library. We make the
682 the versioned symbol point to this one. */
683 bed
= get_elf_backend_data (output_bfd
);
685 while (hv
->root
.type
== bfd_link_hash_indirect
686 || hv
->root
.type
== bfd_link_hash_warning
)
687 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
688 /* We don't need to update h->root.u since linker will set them
690 h
->root
.type
= bfd_link_hash_undefined
;
691 hv
->root
.type
= bfd_link_hash_indirect
;
692 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
693 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
700 /* If this symbol is being provided by the linker script, and it is
701 currently defined by a dynamic object, but not by a regular
702 object, then mark it as undefined so that the generic linker will
703 force the correct value. */
707 h
->root
.type
= bfd_link_hash_undefined
;
709 /* If this symbol is currently defined by a dynamic object, but not
710 by a regular object, then clear out any version information because
711 the symbol will not be associated with the dynamic object any
713 if (h
->def_dynamic
&& !h
->def_regular
)
714 h
->verinfo
.verdef
= NULL
;
716 /* Make sure this symbol is not garbage collected. */
723 bed
= get_elf_backend_data (output_bfd
);
724 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
725 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
726 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
729 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
731 if (!bfd_link_relocatable (info
)
733 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
734 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
739 || bfd_link_dll (info
)
740 || elf_hash_table (info
)->is_relocatable_executable
)
744 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
747 /* If this is a weak defined symbol, and we know a corresponding
748 real symbol from the same dynamic object, make sure the real
749 symbol is also made into a dynamic symbol. */
752 struct elf_link_hash_entry
*def
= weakdef (h
);
754 if (def
->dynindx
== -1
755 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
763 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
764 success, and 2 on a failure caused by attempting to record a symbol
765 in a discarded section, eg. a discarded link-once section symbol. */
768 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
773 struct elf_link_local_dynamic_entry
*entry
;
774 struct elf_link_hash_table
*eht
;
775 struct elf_strtab_hash
*dynstr
;
778 Elf_External_Sym_Shndx eshndx
;
779 char esym
[sizeof (Elf64_External_Sym
)];
781 if (! is_elf_hash_table (info
->hash
))
784 /* See if the entry exists already. */
785 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
786 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
789 amt
= sizeof (*entry
);
790 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
794 /* Go find the symbol, so that we can find it's name. */
795 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
796 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
798 bfd_release (input_bfd
, entry
);
802 if (entry
->isym
.st_shndx
!= SHN_UNDEF
803 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
807 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
808 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
810 /* We can still bfd_release here as nothing has done another
811 bfd_alloc. We can't do this later in this function. */
812 bfd_release (input_bfd
, entry
);
817 name
= (bfd_elf_string_from_elf_section
818 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
819 entry
->isym
.st_name
));
821 dynstr
= elf_hash_table (info
)->dynstr
;
824 /* Create a strtab to hold the dynamic symbol names. */
825 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
830 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
831 if (dynstr_index
== (size_t) -1)
833 entry
->isym
.st_name
= dynstr_index
;
835 eht
= elf_hash_table (info
);
837 entry
->next
= eht
->dynlocal
;
838 eht
->dynlocal
= entry
;
839 entry
->input_bfd
= input_bfd
;
840 entry
->input_indx
= input_indx
;
843 /* Whatever binding the symbol had before, it's now local. */
845 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
847 /* The dynindx will be set at the end of size_dynamic_sections. */
852 /* Return the dynindex of a local dynamic symbol. */
855 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
859 struct elf_link_local_dynamic_entry
*e
;
861 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
862 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
867 /* This function is used to renumber the dynamic symbols, if some of
868 them are removed because they are marked as local. This is called
869 via elf_link_hash_traverse. */
872 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
875 size_t *count
= (size_t *) data
;
880 if (h
->dynindx
!= -1)
881 h
->dynindx
= ++(*count
);
887 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
888 STB_LOCAL binding. */
891 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
894 size_t *count
= (size_t *) data
;
896 if (!h
->forced_local
)
899 if (h
->dynindx
!= -1)
900 h
->dynindx
= ++(*count
);
905 /* Return true if the dynamic symbol for a given section should be
906 omitted when creating a shared library. */
908 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
909 struct bfd_link_info
*info
,
912 struct elf_link_hash_table
*htab
;
915 switch (elf_section_data (p
)->this_hdr
.sh_type
)
919 /* If sh_type is yet undecided, assume it could be
920 SHT_PROGBITS/SHT_NOBITS. */
922 htab
= elf_hash_table (info
);
923 if (htab
->text_index_section
!= NULL
)
924 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
926 return (htab
->dynobj
!= NULL
927 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
928 && ip
->output_section
== p
);
930 /* There shouldn't be section relative relocations
931 against any other section. */
938 _bfd_elf_omit_section_dynsym_all
939 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
940 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
941 asection
*p ATTRIBUTE_UNUSED
)
946 /* Assign dynsym indices. In a shared library we generate a section
947 symbol for each output section, which come first. Next come symbols
948 which have been forced to local binding. Then all of the back-end
949 allocated local dynamic syms, followed by the rest of the global
950 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
951 (This prevents the early call before elf_backend_init_index_section
952 and strip_excluded_output_sections setting dynindx for sections
953 that are stripped.) */
956 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
957 struct bfd_link_info
*info
,
958 unsigned long *section_sym_count
)
960 unsigned long dynsymcount
= 0;
961 bfd_boolean do_sec
= section_sym_count
!= NULL
;
963 if (bfd_link_pic (info
)
964 || elf_hash_table (info
)->is_relocatable_executable
)
966 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
968 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
969 if ((p
->flags
& SEC_EXCLUDE
) == 0
970 && (p
->flags
& SEC_ALLOC
) != 0
971 && elf_hash_table (info
)->dynamic_relocs
972 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
976 elf_section_data (p
)->dynindx
= dynsymcount
;
979 elf_section_data (p
)->dynindx
= 0;
982 *section_sym_count
= dynsymcount
;
984 elf_link_hash_traverse (elf_hash_table (info
),
985 elf_link_renumber_local_hash_table_dynsyms
,
988 if (elf_hash_table (info
)->dynlocal
)
990 struct elf_link_local_dynamic_entry
*p
;
991 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
992 p
->dynindx
= ++dynsymcount
;
994 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
996 elf_link_hash_traverse (elf_hash_table (info
),
997 elf_link_renumber_hash_table_dynsyms
,
1000 /* There is an unused NULL entry at the head of the table which we
1001 must account for in our count even if the table is empty since it
1002 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
1003 .dynamic section. */
1006 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
1010 /* Merge st_other field. */
1013 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
1014 unsigned int st_other
, asection
*sec
,
1015 bfd_boolean definition
, bfd_boolean dynamic
)
1017 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1019 /* If st_other has a processor-specific meaning, specific
1020 code might be needed here. */
1021 if (bed
->elf_backend_merge_symbol_attribute
)
1022 (*bed
->elf_backend_merge_symbol_attribute
) (h
, st_other
, definition
,
1027 unsigned symvis
= ELF_ST_VISIBILITY (st_other
);
1028 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1030 /* Keep the most constraining visibility. Leave the remainder
1031 of the st_other field to elf_backend_merge_symbol_attribute. */
1032 if (symvis
- 1 < hvis
- 1)
1033 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1036 && ELF_ST_VISIBILITY (st_other
) != STV_DEFAULT
1037 && (sec
->flags
& SEC_READONLY
) == 0)
1038 h
->protected_def
= 1;
1041 /* This function is called when we want to merge a new symbol with an
1042 existing symbol. It handles the various cases which arise when we
1043 find a definition in a dynamic object, or when there is already a
1044 definition in a dynamic object. The new symbol is described by
1045 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1046 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1047 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1048 of an old common symbol. We set OVERRIDE if the old symbol is
1049 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1050 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1051 to change. By OK to change, we mean that we shouldn't warn if the
1052 type or size does change. */
1055 _bfd_elf_merge_symbol (bfd
*abfd
,
1056 struct bfd_link_info
*info
,
1058 Elf_Internal_Sym
*sym
,
1061 struct elf_link_hash_entry
**sym_hash
,
1063 bfd_boolean
*pold_weak
,
1064 unsigned int *pold_alignment
,
1067 bfd_boolean
*type_change_ok
,
1068 bfd_boolean
*size_change_ok
,
1069 bfd_boolean
*matched
)
1071 asection
*sec
, *oldsec
;
1072 struct elf_link_hash_entry
*h
;
1073 struct elf_link_hash_entry
*hi
;
1074 struct elf_link_hash_entry
*flip
;
1077 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1078 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
1079 const struct elf_backend_data
*bed
;
1081 bfd_boolean default_sym
= *matched
;
1087 bind
= ELF_ST_BIND (sym
->st_info
);
1089 if (! bfd_is_und_section (sec
))
1090 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
1092 h
= ((struct elf_link_hash_entry
*)
1093 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
1098 bed
= get_elf_backend_data (abfd
);
1100 /* NEW_VERSION is the symbol version of the new symbol. */
1101 if (h
->versioned
!= unversioned
)
1103 /* Symbol version is unknown or versioned. */
1104 new_version
= strrchr (name
, ELF_VER_CHR
);
1107 if (h
->versioned
== unknown
)
1109 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1110 h
->versioned
= versioned_hidden
;
1112 h
->versioned
= versioned
;
1115 if (new_version
[0] == '\0')
1119 h
->versioned
= unversioned
;
1124 /* For merging, we only care about real symbols. But we need to make
1125 sure that indirect symbol dynamic flags are updated. */
1127 while (h
->root
.type
== bfd_link_hash_indirect
1128 || h
->root
.type
== bfd_link_hash_warning
)
1129 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1133 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1137 /* OLD_HIDDEN is true if the existing symbol is only visible
1138 to the symbol with the same symbol version. NEW_HIDDEN is
1139 true if the new symbol is only visible to the symbol with
1140 the same symbol version. */
1141 bfd_boolean old_hidden
= h
->versioned
== versioned_hidden
;
1142 bfd_boolean new_hidden
= hi
->versioned
== versioned_hidden
;
1143 if (!old_hidden
&& !new_hidden
)
1144 /* The new symbol matches the existing symbol if both
1149 /* OLD_VERSION is the symbol version of the existing
1153 if (h
->versioned
>= versioned
)
1154 old_version
= strrchr (h
->root
.root
.string
,
1159 /* The new symbol matches the existing symbol if they
1160 have the same symbol version. */
1161 *matched
= (old_version
== new_version
1162 || (old_version
!= NULL
1163 && new_version
!= NULL
1164 && strcmp (old_version
, new_version
) == 0));
1169 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1174 switch (h
->root
.type
)
1179 case bfd_link_hash_undefined
:
1180 case bfd_link_hash_undefweak
:
1181 oldbfd
= h
->root
.u
.undef
.abfd
;
1184 case bfd_link_hash_defined
:
1185 case bfd_link_hash_defweak
:
1186 oldbfd
= h
->root
.u
.def
.section
->owner
;
1187 oldsec
= h
->root
.u
.def
.section
;
1190 case bfd_link_hash_common
:
1191 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1192 oldsec
= h
->root
.u
.c
.p
->section
;
1194 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1197 if (poldbfd
&& *poldbfd
== NULL
)
1200 /* Differentiate strong and weak symbols. */
1201 newweak
= bind
== STB_WEAK
;
1202 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1203 || h
->root
.type
== bfd_link_hash_undefweak
);
1205 *pold_weak
= oldweak
;
1207 /* We have to check it for every instance since the first few may be
1208 references and not all compilers emit symbol type for undefined
1210 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1212 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1213 respectively, is from a dynamic object. */
1215 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1217 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1218 syms and defined syms in dynamic libraries respectively.
1219 ref_dynamic on the other hand can be set for a symbol defined in
1220 a dynamic library, and def_dynamic may not be set; When the
1221 definition in a dynamic lib is overridden by a definition in the
1222 executable use of the symbol in the dynamic lib becomes a
1223 reference to the executable symbol. */
1226 if (bfd_is_und_section (sec
))
1228 if (bind
!= STB_WEAK
)
1230 h
->ref_dynamic_nonweak
= 1;
1231 hi
->ref_dynamic_nonweak
= 1;
1236 /* Update the existing symbol only if they match. */
1239 hi
->dynamic_def
= 1;
1243 /* If we just created the symbol, mark it as being an ELF symbol.
1244 Other than that, there is nothing to do--there is no merge issue
1245 with a newly defined symbol--so we just return. */
1247 if (h
->root
.type
== bfd_link_hash_new
)
1253 /* In cases involving weak versioned symbols, we may wind up trying
1254 to merge a symbol with itself. Catch that here, to avoid the
1255 confusion that results if we try to override a symbol with
1256 itself. The additional tests catch cases like
1257 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1258 dynamic object, which we do want to handle here. */
1260 && (newweak
|| oldweak
)
1261 && ((abfd
->flags
& DYNAMIC
) == 0
1262 || !h
->def_regular
))
1267 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1268 else if (oldsec
!= NULL
)
1270 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1271 indices used by MIPS ELF. */
1272 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1275 /* Handle a case where plugin_notice won't be called and thus won't
1276 set the non_ir_ref flags on the first pass over symbols. */
1278 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
)
1279 && newdyn
!= olddyn
)
1281 h
->root
.non_ir_ref_dynamic
= TRUE
;
1282 hi
->root
.non_ir_ref_dynamic
= TRUE
;
1285 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1286 respectively, appear to be a definition rather than reference. */
1288 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1290 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1291 && h
->root
.type
!= bfd_link_hash_undefweak
1292 && h
->root
.type
!= bfd_link_hash_common
);
1294 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1295 respectively, appear to be a function. */
1297 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1298 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1300 oldfunc
= (h
->type
!= STT_NOTYPE
1301 && bed
->is_function_type (h
->type
));
1303 if (!(newfunc
&& oldfunc
)
1304 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1305 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1306 && h
->type
!= STT_NOTYPE
1307 && (newdef
|| bfd_is_com_section (sec
))
1308 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1310 /* If creating a default indirect symbol ("foo" or "foo@") from
1311 a dynamic versioned definition ("foo@@") skip doing so if
1312 there is an existing regular definition with a different
1313 type. We don't want, for example, a "time" variable in the
1314 executable overriding a "time" function in a shared library. */
1322 /* When adding a symbol from a regular object file after we have
1323 created indirect symbols, undo the indirection and any
1330 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1331 h
->forced_local
= 0;
1335 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1337 h
->root
.type
= bfd_link_hash_undefined
;
1338 h
->root
.u
.undef
.abfd
= abfd
;
1342 h
->root
.type
= bfd_link_hash_new
;
1343 h
->root
.u
.undef
.abfd
= NULL
;
1349 /* Check TLS symbols. We don't check undefined symbols introduced
1350 by "ld -u" which have no type (and oldbfd NULL), and we don't
1351 check symbols from plugins because they also have no type. */
1353 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1354 && (abfd
->flags
& BFD_PLUGIN
) == 0
1355 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1356 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1359 bfd_boolean ntdef
, tdef
;
1360 asection
*ntsec
, *tsec
;
1362 if (h
->type
== STT_TLS
)
1383 /* xgettext:c-format */
1384 (_("%s: TLS definition in %pB section %pA "
1385 "mismatches non-TLS definition in %pB section %pA"),
1386 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1387 else if (!tdef
&& !ntdef
)
1389 /* xgettext:c-format */
1390 (_("%s: TLS reference in %pB "
1391 "mismatches non-TLS reference in %pB"),
1392 h
->root
.root
.string
, tbfd
, ntbfd
);
1395 /* xgettext:c-format */
1396 (_("%s: TLS definition in %pB section %pA "
1397 "mismatches non-TLS reference in %pB"),
1398 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1401 /* xgettext:c-format */
1402 (_("%s: TLS reference in %pB "
1403 "mismatches non-TLS definition in %pB section %pA"),
1404 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1406 bfd_set_error (bfd_error_bad_value
);
1410 /* If the old symbol has non-default visibility, we ignore the new
1411 definition from a dynamic object. */
1413 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1414 && !bfd_is_und_section (sec
))
1417 /* Make sure this symbol is dynamic. */
1419 hi
->ref_dynamic
= 1;
1420 /* A protected symbol has external availability. Make sure it is
1421 recorded as dynamic.
1423 FIXME: Should we check type and size for protected symbol? */
1424 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1425 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1430 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1433 /* If the new symbol with non-default visibility comes from a
1434 relocatable file and the old definition comes from a dynamic
1435 object, we remove the old definition. */
1436 if (hi
->root
.type
== bfd_link_hash_indirect
)
1438 /* Handle the case where the old dynamic definition is
1439 default versioned. We need to copy the symbol info from
1440 the symbol with default version to the normal one if it
1441 was referenced before. */
1444 hi
->root
.type
= h
->root
.type
;
1445 h
->root
.type
= bfd_link_hash_indirect
;
1446 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1448 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1449 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1451 /* If the new symbol is hidden or internal, completely undo
1452 any dynamic link state. */
1453 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1454 h
->forced_local
= 0;
1461 /* FIXME: Should we check type and size for protected symbol? */
1471 /* If the old symbol was undefined before, then it will still be
1472 on the undefs list. If the new symbol is undefined or
1473 common, we can't make it bfd_link_hash_new here, because new
1474 undefined or common symbols will be added to the undefs list
1475 by _bfd_generic_link_add_one_symbol. Symbols may not be
1476 added twice to the undefs list. Also, if the new symbol is
1477 undefweak then we don't want to lose the strong undef. */
1478 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1480 h
->root
.type
= bfd_link_hash_undefined
;
1481 h
->root
.u
.undef
.abfd
= abfd
;
1485 h
->root
.type
= bfd_link_hash_new
;
1486 h
->root
.u
.undef
.abfd
= NULL
;
1489 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1491 /* If the new symbol is hidden or internal, completely undo
1492 any dynamic link state. */
1493 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1494 h
->forced_local
= 0;
1500 /* FIXME: Should we check type and size for protected symbol? */
1506 /* If a new weak symbol definition comes from a regular file and the
1507 old symbol comes from a dynamic library, we treat the new one as
1508 strong. Similarly, an old weak symbol definition from a regular
1509 file is treated as strong when the new symbol comes from a dynamic
1510 library. Further, an old weak symbol from a dynamic library is
1511 treated as strong if the new symbol is from a dynamic library.
1512 This reflects the way glibc's ld.so works.
1514 Also allow a weak symbol to override a linker script symbol
1515 defined by an early pass over the script. This is done so the
1516 linker knows the symbol is defined in an object file, for the
1517 DEFINED script function.
1519 Do this before setting *type_change_ok or *size_change_ok so that
1520 we warn properly when dynamic library symbols are overridden. */
1522 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1524 if (olddef
&& newdyn
)
1527 /* Allow changes between different types of function symbol. */
1528 if (newfunc
&& oldfunc
)
1529 *type_change_ok
= TRUE
;
1531 /* It's OK to change the type if either the existing symbol or the
1532 new symbol is weak. A type change is also OK if the old symbol
1533 is undefined and the new symbol is defined. */
1538 && h
->root
.type
== bfd_link_hash_undefined
))
1539 *type_change_ok
= TRUE
;
1541 /* It's OK to change the size if either the existing symbol or the
1542 new symbol is weak, or if the old symbol is undefined. */
1545 || h
->root
.type
== bfd_link_hash_undefined
)
1546 *size_change_ok
= TRUE
;
1548 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1549 symbol, respectively, appears to be a common symbol in a dynamic
1550 object. If a symbol appears in an uninitialized section, and is
1551 not weak, and is not a function, then it may be a common symbol
1552 which was resolved when the dynamic object was created. We want
1553 to treat such symbols specially, because they raise special
1554 considerations when setting the symbol size: if the symbol
1555 appears as a common symbol in a regular object, and the size in
1556 the regular object is larger, we must make sure that we use the
1557 larger size. This problematic case can always be avoided in C,
1558 but it must be handled correctly when using Fortran shared
1561 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1562 likewise for OLDDYNCOMMON and OLDDEF.
1564 Note that this test is just a heuristic, and that it is quite
1565 possible to have an uninitialized symbol in a shared object which
1566 is really a definition, rather than a common symbol. This could
1567 lead to some minor confusion when the symbol really is a common
1568 symbol in some regular object. However, I think it will be
1574 && (sec
->flags
& SEC_ALLOC
) != 0
1575 && (sec
->flags
& SEC_LOAD
) == 0
1578 newdyncommon
= TRUE
;
1580 newdyncommon
= FALSE
;
1584 && h
->root
.type
== bfd_link_hash_defined
1586 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1587 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1590 olddyncommon
= TRUE
;
1592 olddyncommon
= FALSE
;
1594 /* We now know everything about the old and new symbols. We ask the
1595 backend to check if we can merge them. */
1596 if (bed
->merge_symbol
!= NULL
)
1598 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1603 /* There are multiple definitions of a normal symbol. Skip the
1604 default symbol as well as definition from an IR object. */
1605 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1606 && !default_sym
&& h
->def_regular
1608 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1609 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1611 /* Handle a multiple definition. */
1612 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1613 abfd
, sec
, *pvalue
);
1618 /* If both the old and the new symbols look like common symbols in a
1619 dynamic object, set the size of the symbol to the larger of the
1624 && sym
->st_size
!= h
->size
)
1626 /* Since we think we have two common symbols, issue a multiple
1627 common warning if desired. Note that we only warn if the
1628 size is different. If the size is the same, we simply let
1629 the old symbol override the new one as normally happens with
1630 symbols defined in dynamic objects. */
1632 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1633 bfd_link_hash_common
, sym
->st_size
);
1634 if (sym
->st_size
> h
->size
)
1635 h
->size
= sym
->st_size
;
1637 *size_change_ok
= TRUE
;
1640 /* If we are looking at a dynamic object, and we have found a
1641 definition, we need to see if the symbol was already defined by
1642 some other object. If so, we want to use the existing
1643 definition, and we do not want to report a multiple symbol
1644 definition error; we do this by clobbering *PSEC to be
1645 bfd_und_section_ptr.
1647 We treat a common symbol as a definition if the symbol in the
1648 shared library is a function, since common symbols always
1649 represent variables; this can cause confusion in principle, but
1650 any such confusion would seem to indicate an erroneous program or
1651 shared library. We also permit a common symbol in a regular
1652 object to override a weak symbol in a shared object. */
1657 || (h
->root
.type
== bfd_link_hash_common
1658 && (newweak
|| newfunc
))))
1662 newdyncommon
= FALSE
;
1664 *psec
= sec
= bfd_und_section_ptr
;
1665 *size_change_ok
= TRUE
;
1667 /* If we get here when the old symbol is a common symbol, then
1668 we are explicitly letting it override a weak symbol or
1669 function in a dynamic object, and we don't want to warn about
1670 a type change. If the old symbol is a defined symbol, a type
1671 change warning may still be appropriate. */
1673 if (h
->root
.type
== bfd_link_hash_common
)
1674 *type_change_ok
= TRUE
;
1677 /* Handle the special case of an old common symbol merging with a
1678 new symbol which looks like a common symbol in a shared object.
1679 We change *PSEC and *PVALUE to make the new symbol look like a
1680 common symbol, and let _bfd_generic_link_add_one_symbol do the
1684 && h
->root
.type
== bfd_link_hash_common
)
1688 newdyncommon
= FALSE
;
1689 *pvalue
= sym
->st_size
;
1690 *psec
= sec
= bed
->common_section (oldsec
);
1691 *size_change_ok
= TRUE
;
1694 /* Skip weak definitions of symbols that are already defined. */
1695 if (newdef
&& olddef
&& newweak
)
1697 /* Don't skip new non-IR weak syms. */
1698 if (!(oldbfd
!= NULL
1699 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1700 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1706 /* Merge st_other. If the symbol already has a dynamic index,
1707 but visibility says it should not be visible, turn it into a
1709 elf_merge_st_other (abfd
, h
, sym
->st_other
, sec
, newdef
, newdyn
);
1710 if (h
->dynindx
!= -1)
1711 switch (ELF_ST_VISIBILITY (h
->other
))
1715 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1720 /* If the old symbol is from a dynamic object, and the new symbol is
1721 a definition which is not from a dynamic object, then the new
1722 symbol overrides the old symbol. Symbols from regular files
1723 always take precedence over symbols from dynamic objects, even if
1724 they are defined after the dynamic object in the link.
1726 As above, we again permit a common symbol in a regular object to
1727 override a definition in a shared object if the shared object
1728 symbol is a function or is weak. */
1733 || (bfd_is_com_section (sec
)
1734 && (oldweak
|| oldfunc
)))
1739 /* Change the hash table entry to undefined, and let
1740 _bfd_generic_link_add_one_symbol do the right thing with the
1743 h
->root
.type
= bfd_link_hash_undefined
;
1744 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1745 *size_change_ok
= TRUE
;
1748 olddyncommon
= FALSE
;
1750 /* We again permit a type change when a common symbol may be
1751 overriding a function. */
1753 if (bfd_is_com_section (sec
))
1757 /* If a common symbol overrides a function, make sure
1758 that it isn't defined dynamically nor has type
1761 h
->type
= STT_NOTYPE
;
1763 *type_change_ok
= TRUE
;
1766 if (hi
->root
.type
== bfd_link_hash_indirect
)
1769 /* This union may have been set to be non-NULL when this symbol
1770 was seen in a dynamic object. We must force the union to be
1771 NULL, so that it is correct for a regular symbol. */
1772 h
->verinfo
.vertree
= NULL
;
1775 /* Handle the special case of a new common symbol merging with an
1776 old symbol that looks like it might be a common symbol defined in
1777 a shared object. Note that we have already handled the case in
1778 which a new common symbol should simply override the definition
1779 in the shared library. */
1782 && bfd_is_com_section (sec
)
1785 /* It would be best if we could set the hash table entry to a
1786 common symbol, but we don't know what to use for the section
1787 or the alignment. */
1788 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1789 bfd_link_hash_common
, sym
->st_size
);
1791 /* If the presumed common symbol in the dynamic object is
1792 larger, pretend that the new symbol has its size. */
1794 if (h
->size
> *pvalue
)
1797 /* We need to remember the alignment required by the symbol
1798 in the dynamic object. */
1799 BFD_ASSERT (pold_alignment
);
1800 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1803 olddyncommon
= FALSE
;
1805 h
->root
.type
= bfd_link_hash_undefined
;
1806 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1808 *size_change_ok
= TRUE
;
1809 *type_change_ok
= TRUE
;
1811 if (hi
->root
.type
== bfd_link_hash_indirect
)
1814 h
->verinfo
.vertree
= NULL
;
1819 /* Handle the case where we had a versioned symbol in a dynamic
1820 library and now find a definition in a normal object. In this
1821 case, we make the versioned symbol point to the normal one. */
1822 flip
->root
.type
= h
->root
.type
;
1823 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1824 h
->root
.type
= bfd_link_hash_indirect
;
1825 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1826 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1830 flip
->ref_dynamic
= 1;
1837 /* This function is called to create an indirect symbol from the
1838 default for the symbol with the default version if needed. The
1839 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1840 set DYNSYM if the new indirect symbol is dynamic. */
1843 _bfd_elf_add_default_symbol (bfd
*abfd
,
1844 struct bfd_link_info
*info
,
1845 struct elf_link_hash_entry
*h
,
1847 Elf_Internal_Sym
*sym
,
1851 bfd_boolean
*dynsym
)
1853 bfd_boolean type_change_ok
;
1854 bfd_boolean size_change_ok
;
1857 struct elf_link_hash_entry
*hi
;
1858 struct bfd_link_hash_entry
*bh
;
1859 const struct elf_backend_data
*bed
;
1860 bfd_boolean collect
;
1861 bfd_boolean dynamic
;
1864 size_t len
, shortlen
;
1866 bfd_boolean matched
;
1868 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1871 /* If this symbol has a version, and it is the default version, we
1872 create an indirect symbol from the default name to the fully
1873 decorated name. This will cause external references which do not
1874 specify a version to be bound to this version of the symbol. */
1875 p
= strchr (name
, ELF_VER_CHR
);
1876 if (h
->versioned
== unknown
)
1880 h
->versioned
= unversioned
;
1885 if (p
[1] != ELF_VER_CHR
)
1887 h
->versioned
= versioned_hidden
;
1891 h
->versioned
= versioned
;
1896 /* PR ld/19073: We may see an unversioned definition after the
1902 bed
= get_elf_backend_data (abfd
);
1903 collect
= bed
->collect
;
1904 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1906 shortlen
= p
- name
;
1907 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1908 if (shortname
== NULL
)
1910 memcpy (shortname
, name
, shortlen
);
1911 shortname
[shortlen
] = '\0';
1913 /* We are going to create a new symbol. Merge it with any existing
1914 symbol with this name. For the purposes of the merge, act as
1915 though we were defining the symbol we just defined, although we
1916 actually going to define an indirect symbol. */
1917 type_change_ok
= FALSE
;
1918 size_change_ok
= FALSE
;
1921 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1922 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1923 &type_change_ok
, &size_change_ok
, &matched
))
1929 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1931 /* If the undecorated symbol will have a version added by a
1932 script different to H, then don't indirect to/from the
1933 undecorated symbol. This isn't ideal because we may not yet
1934 have seen symbol versions, if given by a script on the
1935 command line rather than via --version-script. */
1936 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1941 = bfd_find_version_for_sym (info
->version_info
,
1942 hi
->root
.root
.string
, &hide
);
1943 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1945 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
1949 if (hi
->verinfo
.vertree
!= NULL
1950 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1956 /* Add the default symbol if not performing a relocatable link. */
1957 if (! bfd_link_relocatable (info
))
1960 if (bh
->type
== bfd_link_hash_defined
1961 && bh
->u
.def
.section
->owner
!= NULL
1962 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1964 /* Mark the previous definition from IR object as
1965 undefined so that the generic linker will override
1967 bh
->type
= bfd_link_hash_undefined
;
1968 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1970 if (! (_bfd_generic_link_add_one_symbol
1971 (info
, abfd
, shortname
, BSF_INDIRECT
,
1972 bfd_ind_section_ptr
,
1973 0, name
, FALSE
, collect
, &bh
)))
1975 hi
= (struct elf_link_hash_entry
*) bh
;
1980 /* In this case the symbol named SHORTNAME is overriding the
1981 indirect symbol we want to add. We were planning on making
1982 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1983 is the name without a version. NAME is the fully versioned
1984 name, and it is the default version.
1986 Overriding means that we already saw a definition for the
1987 symbol SHORTNAME in a regular object, and it is overriding
1988 the symbol defined in the dynamic object.
1990 When this happens, we actually want to change NAME, the
1991 symbol we just added, to refer to SHORTNAME. This will cause
1992 references to NAME in the shared object to become references
1993 to SHORTNAME in the regular object. This is what we expect
1994 when we override a function in a shared object: that the
1995 references in the shared object will be mapped to the
1996 definition in the regular object. */
1998 while (hi
->root
.type
== bfd_link_hash_indirect
1999 || hi
->root
.type
== bfd_link_hash_warning
)
2000 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2002 h
->root
.type
= bfd_link_hash_indirect
;
2003 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
2007 hi
->ref_dynamic
= 1;
2011 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
2016 /* Now set HI to H, so that the following code will set the
2017 other fields correctly. */
2021 /* Check if HI is a warning symbol. */
2022 if (hi
->root
.type
== bfd_link_hash_warning
)
2023 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2025 /* If there is a duplicate definition somewhere, then HI may not
2026 point to an indirect symbol. We will have reported an error to
2027 the user in that case. */
2029 if (hi
->root
.type
== bfd_link_hash_indirect
)
2031 struct elf_link_hash_entry
*ht
;
2033 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2034 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2036 /* If we first saw a reference to SHORTNAME with non-default
2037 visibility, merge that visibility to the @@VER symbol. */
2038 elf_merge_st_other (abfd
, ht
, hi
->other
, sec
, TRUE
, dynamic
);
2040 /* A reference to the SHORTNAME symbol from a dynamic library
2041 will be satisfied by the versioned symbol at runtime. In
2042 effect, we have a reference to the versioned symbol. */
2043 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2044 hi
->dynamic_def
|= ht
->dynamic_def
;
2046 /* See if the new flags lead us to realize that the symbol must
2052 if (! bfd_link_executable (info
)
2059 if (hi
->ref_regular
)
2065 /* We also need to define an indirection from the nondefault version
2069 len
= strlen (name
);
2070 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2071 if (shortname
== NULL
)
2073 memcpy (shortname
, name
, shortlen
);
2074 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2076 /* Once again, merge with any existing symbol. */
2077 type_change_ok
= FALSE
;
2078 size_change_ok
= FALSE
;
2080 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2081 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2082 &type_change_ok
, &size_change_ok
, &matched
))
2088 && h
->root
.type
== bfd_link_hash_defweak
2089 && hi
->root
.type
== bfd_link_hash_defined
)
2091 /* We are handling a weak sym@@ver and attempting to define
2092 a weak sym@ver, but _bfd_elf_merge_symbol said to skip the
2093 new weak sym@ver because there is already a strong sym@ver.
2094 However, sym@ver and sym@@ver are really the same symbol.
2095 The existing strong sym@ver ought to override sym@@ver. */
2096 h
->root
.type
= bfd_link_hash_defined
;
2097 h
->root
.u
.def
.section
= hi
->root
.u
.def
.section
;
2098 h
->root
.u
.def
.value
= hi
->root
.u
.def
.value
;
2099 hi
->root
.type
= bfd_link_hash_indirect
;
2100 hi
->root
.u
.i
.link
= &h
->root
;
2107 /* Here SHORTNAME is a versioned name, so we don't expect to see
2108 the type of override we do in the case above unless it is
2109 overridden by a versioned definition. */
2110 if (hi
->root
.type
!= bfd_link_hash_defined
2111 && hi
->root
.type
!= bfd_link_hash_defweak
)
2113 /* xgettext:c-format */
2114 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2121 if (! (_bfd_generic_link_add_one_symbol
2122 (info
, abfd
, shortname
, BSF_INDIRECT
,
2123 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
2125 hi
= (struct elf_link_hash_entry
*) bh
;
2128 /* If there is a duplicate definition somewhere, then HI may not
2129 point to an indirect symbol. We will have reported an error
2130 to the user in that case. */
2131 if (hi
->root
.type
== bfd_link_hash_indirect
)
2133 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2134 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2135 hi
->dynamic_def
|= h
->dynamic_def
;
2137 /* If we first saw a reference to @VER symbol with
2138 non-default visibility, merge that visibility to the
2140 elf_merge_st_other (abfd
, h
, hi
->other
, sec
, TRUE
, dynamic
);
2142 /* See if the new flags lead us to realize that the symbol
2148 if (! bfd_link_executable (info
)
2154 if (hi
->ref_regular
)
2163 /* This routine is used to export all defined symbols into the dynamic
2164 symbol table. It is called via elf_link_hash_traverse. */
2167 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2169 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2171 /* Ignore indirect symbols. These are added by the versioning code. */
2172 if (h
->root
.type
== bfd_link_hash_indirect
)
2175 /* Ignore this if we won't export it. */
2176 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2179 if (h
->dynindx
== -1
2180 && (h
->def_regular
|| h
->ref_regular
)
2181 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2182 h
->root
.root
.string
))
2184 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2194 /* Look through the symbols which are defined in other shared
2195 libraries and referenced here. Update the list of version
2196 dependencies. This will be put into the .gnu.version_r section.
2197 This function is called via elf_link_hash_traverse. */
2200 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2203 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2204 Elf_Internal_Verneed
*t
;
2205 Elf_Internal_Vernaux
*a
;
2208 /* We only care about symbols defined in shared objects with version
2213 || h
->verinfo
.verdef
== NULL
2214 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2215 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2218 /* See if we already know about this version. */
2219 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2223 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2226 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2227 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2233 /* This is a new version. Add it to tree we are building. */
2238 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2241 rinfo
->failed
= TRUE
;
2245 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2246 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2247 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2251 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2254 rinfo
->failed
= TRUE
;
2258 /* Note that we are copying a string pointer here, and testing it
2259 above. If bfd_elf_string_from_elf_section is ever changed to
2260 discard the string data when low in memory, this will have to be
2262 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2264 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2265 a
->vna_nextptr
= t
->vn_auxptr
;
2267 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2270 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2277 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2278 hidden. Set *T_P to NULL if there is no match. */
2281 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2282 struct elf_link_hash_entry
*h
,
2283 const char *version_p
,
2284 struct bfd_elf_version_tree
**t_p
,
2287 struct bfd_elf_version_tree
*t
;
2289 /* Look for the version. If we find it, it is no longer weak. */
2290 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2292 if (strcmp (t
->name
, version_p
) == 0)
2296 struct bfd_elf_version_expr
*d
;
2298 len
= version_p
- h
->root
.root
.string
;
2299 alc
= (char *) bfd_malloc (len
);
2302 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2303 alc
[len
- 1] = '\0';
2304 if (alc
[len
- 2] == ELF_VER_CHR
)
2305 alc
[len
- 2] = '\0';
2307 h
->verinfo
.vertree
= t
;
2311 if (t
->globals
.list
!= NULL
)
2312 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2314 /* See if there is anything to force this symbol to
2316 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2318 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2321 && ! info
->export_dynamic
)
2335 /* Return TRUE if the symbol H is hidden by version script. */
2338 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2339 struct elf_link_hash_entry
*h
)
2342 bfd_boolean hide
= FALSE
;
2343 const struct elf_backend_data
*bed
2344 = get_elf_backend_data (info
->output_bfd
);
2346 /* Version script only hides symbols defined in regular objects. */
2347 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2350 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2351 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2353 struct bfd_elf_version_tree
*t
;
2356 if (*p
== ELF_VER_CHR
)
2360 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2364 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2369 /* If we don't have a version for this symbol, see if we can find
2371 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2374 = bfd_find_version_for_sym (info
->version_info
,
2375 h
->root
.root
.string
, &hide
);
2376 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2378 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2386 /* Figure out appropriate versions for all the symbols. We may not
2387 have the version number script until we have read all of the input
2388 files, so until that point we don't know which symbols should be
2389 local. This function is called via elf_link_hash_traverse. */
2392 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2394 struct elf_info_failed
*sinfo
;
2395 struct bfd_link_info
*info
;
2396 const struct elf_backend_data
*bed
;
2397 struct elf_info_failed eif
;
2401 sinfo
= (struct elf_info_failed
*) data
;
2404 /* Fix the symbol flags. */
2407 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2410 sinfo
->failed
= TRUE
;
2414 bed
= get_elf_backend_data (info
->output_bfd
);
2416 /* We only need version numbers for symbols defined in regular
2418 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2420 /* Hide symbols defined in discarded input sections. */
2421 if ((h
->root
.type
== bfd_link_hash_defined
2422 || h
->root
.type
== bfd_link_hash_defweak
)
2423 && discarded_section (h
->root
.u
.def
.section
))
2424 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2429 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2430 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2432 struct bfd_elf_version_tree
*t
;
2435 if (*p
== ELF_VER_CHR
)
2438 /* If there is no version string, we can just return out. */
2442 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2444 sinfo
->failed
= TRUE
;
2449 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2451 /* If we are building an application, we need to create a
2452 version node for this version. */
2453 if (t
== NULL
&& bfd_link_executable (info
))
2455 struct bfd_elf_version_tree
**pp
;
2458 /* If we aren't going to export this symbol, we don't need
2459 to worry about it. */
2460 if (h
->dynindx
== -1)
2463 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2467 sinfo
->failed
= TRUE
;
2472 t
->name_indx
= (unsigned int) -1;
2476 /* Don't count anonymous version tag. */
2477 if (sinfo
->info
->version_info
!= NULL
2478 && sinfo
->info
->version_info
->vernum
== 0)
2480 for (pp
= &sinfo
->info
->version_info
;
2484 t
->vernum
= version_index
;
2488 h
->verinfo
.vertree
= t
;
2492 /* We could not find the version for a symbol when
2493 generating a shared archive. Return an error. */
2495 /* xgettext:c-format */
2496 (_("%pB: version node not found for symbol %s"),
2497 info
->output_bfd
, h
->root
.root
.string
);
2498 bfd_set_error (bfd_error_bad_value
);
2499 sinfo
->failed
= TRUE
;
2504 /* If we don't have a version for this symbol, see if we can find
2507 && h
->verinfo
.vertree
== NULL
2508 && sinfo
->info
->version_info
!= NULL
)
2511 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2512 h
->root
.root
.string
, &hide
);
2513 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2514 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2520 /* Read and swap the relocs from the section indicated by SHDR. This
2521 may be either a REL or a RELA section. The relocations are
2522 translated into RELA relocations and stored in INTERNAL_RELOCS,
2523 which should have already been allocated to contain enough space.
2524 The EXTERNAL_RELOCS are a buffer where the external form of the
2525 relocations should be stored.
2527 Returns FALSE if something goes wrong. */
2530 elf_link_read_relocs_from_section (bfd
*abfd
,
2532 Elf_Internal_Shdr
*shdr
,
2533 void *external_relocs
,
2534 Elf_Internal_Rela
*internal_relocs
)
2536 const struct elf_backend_data
*bed
;
2537 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2538 const bfd_byte
*erela
;
2539 const bfd_byte
*erelaend
;
2540 Elf_Internal_Rela
*irela
;
2541 Elf_Internal_Shdr
*symtab_hdr
;
2544 /* Position ourselves at the start of the section. */
2545 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2548 /* Read the relocations. */
2549 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2552 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2553 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2555 bed
= get_elf_backend_data (abfd
);
2557 /* Convert the external relocations to the internal format. */
2558 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2559 swap_in
= bed
->s
->swap_reloc_in
;
2560 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2561 swap_in
= bed
->s
->swap_reloca_in
;
2564 bfd_set_error (bfd_error_wrong_format
);
2568 erela
= (const bfd_byte
*) external_relocs
;
2569 /* Setting erelaend like this and comparing with <= handles case of
2570 a fuzzed object with sh_size not a multiple of sh_entsize. */
2571 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2572 irela
= internal_relocs
;
2573 while (erela
<= erelaend
)
2577 (*swap_in
) (abfd
, erela
, irela
);
2578 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2579 if (bed
->s
->arch_size
== 64)
2583 if ((size_t) r_symndx
>= nsyms
)
2586 /* xgettext:c-format */
2587 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2588 " for offset %#" PRIx64
" in section `%pA'"),
2589 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2590 (uint64_t) irela
->r_offset
, sec
);
2591 bfd_set_error (bfd_error_bad_value
);
2595 else if (r_symndx
!= STN_UNDEF
)
2598 /* xgettext:c-format */
2599 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2600 " for offset %#" PRIx64
" in section `%pA'"
2601 " when the object file has no symbol table"),
2602 abfd
, (uint64_t) r_symndx
,
2603 (uint64_t) irela
->r_offset
, sec
);
2604 bfd_set_error (bfd_error_bad_value
);
2607 irela
+= bed
->s
->int_rels_per_ext_rel
;
2608 erela
+= shdr
->sh_entsize
;
2614 /* Read and swap the relocs for a section O. They may have been
2615 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2616 not NULL, they are used as buffers to read into. They are known to
2617 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2618 the return value is allocated using either malloc or bfd_alloc,
2619 according to the KEEP_MEMORY argument. If O has two relocation
2620 sections (both REL and RELA relocations), then the REL_HDR
2621 relocations will appear first in INTERNAL_RELOCS, followed by the
2622 RELA_HDR relocations. */
2625 _bfd_elf_link_read_relocs (bfd
*abfd
,
2627 void *external_relocs
,
2628 Elf_Internal_Rela
*internal_relocs
,
2629 bfd_boolean keep_memory
)
2631 void *alloc1
= NULL
;
2632 Elf_Internal_Rela
*alloc2
= NULL
;
2633 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2634 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2635 Elf_Internal_Rela
*internal_rela_relocs
;
2637 if (esdo
->relocs
!= NULL
)
2638 return esdo
->relocs
;
2640 if (o
->reloc_count
== 0)
2643 if (internal_relocs
== NULL
)
2647 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2649 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2651 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2652 if (internal_relocs
== NULL
)
2656 if (external_relocs
== NULL
)
2658 bfd_size_type size
= 0;
2661 size
+= esdo
->rel
.hdr
->sh_size
;
2663 size
+= esdo
->rela
.hdr
->sh_size
;
2665 alloc1
= bfd_malloc (size
);
2668 external_relocs
= alloc1
;
2671 internal_rela_relocs
= internal_relocs
;
2674 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2678 external_relocs
= (((bfd_byte
*) external_relocs
)
2679 + esdo
->rel
.hdr
->sh_size
);
2680 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2681 * bed
->s
->int_rels_per_ext_rel
);
2685 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2687 internal_rela_relocs
)))
2690 /* Cache the results for next time, if we can. */
2692 esdo
->relocs
= internal_relocs
;
2696 /* Don't free alloc2, since if it was allocated we are passing it
2697 back (under the name of internal_relocs). */
2699 return internal_relocs
;
2706 bfd_release (abfd
, alloc2
);
2713 /* Compute the size of, and allocate space for, REL_HDR which is the
2714 section header for a section containing relocations for O. */
2717 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2718 struct bfd_elf_section_reloc_data
*reldata
)
2720 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2722 /* That allows us to calculate the size of the section. */
2723 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2725 /* The contents field must last into write_object_contents, so we
2726 allocate it with bfd_alloc rather than malloc. Also since we
2727 cannot be sure that the contents will actually be filled in,
2728 we zero the allocated space. */
2729 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2730 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2733 if (reldata
->hashes
== NULL
&& reldata
->count
)
2735 struct elf_link_hash_entry
**p
;
2737 p
= ((struct elf_link_hash_entry
**)
2738 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2742 reldata
->hashes
= p
;
2748 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2749 originated from the section given by INPUT_REL_HDR) to the
2753 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2754 asection
*input_section
,
2755 Elf_Internal_Shdr
*input_rel_hdr
,
2756 Elf_Internal_Rela
*internal_relocs
,
2757 struct elf_link_hash_entry
**rel_hash
2760 Elf_Internal_Rela
*irela
;
2761 Elf_Internal_Rela
*irelaend
;
2763 struct bfd_elf_section_reloc_data
*output_reldata
;
2764 asection
*output_section
;
2765 const struct elf_backend_data
*bed
;
2766 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2767 struct bfd_elf_section_data
*esdo
;
2769 output_section
= input_section
->output_section
;
2771 bed
= get_elf_backend_data (output_bfd
);
2772 esdo
= elf_section_data (output_section
);
2773 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2775 output_reldata
= &esdo
->rel
;
2776 swap_out
= bed
->s
->swap_reloc_out
;
2778 else if (esdo
->rela
.hdr
2779 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2781 output_reldata
= &esdo
->rela
;
2782 swap_out
= bed
->s
->swap_reloca_out
;
2787 /* xgettext:c-format */
2788 (_("%pB: relocation size mismatch in %pB section %pA"),
2789 output_bfd
, input_section
->owner
, input_section
);
2790 bfd_set_error (bfd_error_wrong_format
);
2794 erel
= output_reldata
->hdr
->contents
;
2795 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2796 irela
= internal_relocs
;
2797 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2798 * bed
->s
->int_rels_per_ext_rel
);
2799 while (irela
< irelaend
)
2801 (*swap_out
) (output_bfd
, irela
, erel
);
2802 irela
+= bed
->s
->int_rels_per_ext_rel
;
2803 erel
+= input_rel_hdr
->sh_entsize
;
2806 /* Bump the counter, so that we know where to add the next set of
2808 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2813 /* Make weak undefined symbols in PIE dynamic. */
2816 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2817 struct elf_link_hash_entry
*h
)
2819 if (bfd_link_pie (info
)
2821 && h
->root
.type
== bfd_link_hash_undefweak
)
2822 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2827 /* Fix up the flags for a symbol. This handles various cases which
2828 can only be fixed after all the input files are seen. This is
2829 currently called by both adjust_dynamic_symbol and
2830 assign_sym_version, which is unnecessary but perhaps more robust in
2831 the face of future changes. */
2834 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2835 struct elf_info_failed
*eif
)
2837 const struct elf_backend_data
*bed
;
2839 /* If this symbol was mentioned in a non-ELF file, try to set
2840 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2841 permit a non-ELF file to correctly refer to a symbol defined in
2842 an ELF dynamic object. */
2845 while (h
->root
.type
== bfd_link_hash_indirect
)
2846 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2848 if (h
->root
.type
!= bfd_link_hash_defined
2849 && h
->root
.type
!= bfd_link_hash_defweak
)
2852 h
->ref_regular_nonweak
= 1;
2856 if (h
->root
.u
.def
.section
->owner
!= NULL
2857 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2858 == bfd_target_elf_flavour
))
2861 h
->ref_regular_nonweak
= 1;
2867 if (h
->dynindx
== -1
2871 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2880 /* Unfortunately, NON_ELF is only correct if the symbol
2881 was first seen in a non-ELF file. Fortunately, if the symbol
2882 was first seen in an ELF file, we're probably OK unless the
2883 symbol was defined in a non-ELF file. Catch that case here.
2884 FIXME: We're still in trouble if the symbol was first seen in
2885 a dynamic object, and then later in a non-ELF regular object. */
2886 if ((h
->root
.type
== bfd_link_hash_defined
2887 || h
->root
.type
== bfd_link_hash_defweak
)
2889 && (h
->root
.u
.def
.section
->owner
!= NULL
2890 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2891 != bfd_target_elf_flavour
)
2892 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2893 && !h
->def_dynamic
)))
2897 /* Backend specific symbol fixup. */
2898 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2899 if (bed
->elf_backend_fixup_symbol
2900 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2903 /* If this is a final link, and the symbol was defined as a common
2904 symbol in a regular object file, and there was no definition in
2905 any dynamic object, then the linker will have allocated space for
2906 the symbol in a common section but the DEF_REGULAR
2907 flag will not have been set. */
2908 if (h
->root
.type
== bfd_link_hash_defined
2912 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2915 /* Symbols defined in discarded sections shouldn't be dynamic. */
2916 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2917 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2919 /* If a weak undefined symbol has non-default visibility, we also
2920 hide it from the dynamic linker. */
2921 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2922 && h
->root
.type
== bfd_link_hash_undefweak
)
2923 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2925 /* A hidden versioned symbol in executable should be forced local if
2926 it is is locally defined, not referenced by shared library and not
2928 else if (bfd_link_executable (eif
->info
)
2929 && h
->versioned
== versioned_hidden
2930 && !eif
->info
->export_dynamic
2934 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2936 /* If -Bsymbolic was used (which means to bind references to global
2937 symbols to the definition within the shared object), and this
2938 symbol was defined in a regular object, then it actually doesn't
2939 need a PLT entry. Likewise, if the symbol has non-default
2940 visibility. If the symbol has hidden or internal visibility, we
2941 will force it local. */
2942 else if (h
->needs_plt
2943 && bfd_link_pic (eif
->info
)
2944 && is_elf_hash_table (eif
->info
->hash
)
2945 && (SYMBOLIC_BIND (eif
->info
, h
)
2946 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2949 bfd_boolean force_local
;
2951 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2952 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2953 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2956 /* If this is a weak defined symbol in a dynamic object, and we know
2957 the real definition in the dynamic object, copy interesting flags
2958 over to the real definition. */
2959 if (h
->is_weakalias
)
2961 struct elf_link_hash_entry
*def
= weakdef (h
);
2963 /* If the real definition is defined by a regular object file,
2964 don't do anything special. See the longer description in
2965 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2966 bfd_link_hash_defined as it was when put on the alias list
2967 then it must have originally been a versioned symbol (for
2968 which a non-versioned indirect symbol is created) and later
2969 a definition for the non-versioned symbol is found. In that
2970 case the indirection is flipped with the versioned symbol
2971 becoming an indirect pointing at the non-versioned symbol.
2972 Thus, not an alias any more. */
2973 if (def
->def_regular
2974 || def
->root
.type
!= bfd_link_hash_defined
)
2977 while ((h
= h
->u
.alias
) != def
)
2978 h
->is_weakalias
= 0;
2982 while (h
->root
.type
== bfd_link_hash_indirect
)
2983 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2984 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2985 || h
->root
.type
== bfd_link_hash_defweak
);
2986 BFD_ASSERT (def
->def_dynamic
);
2987 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2994 /* Make the backend pick a good value for a dynamic symbol. This is
2995 called via elf_link_hash_traverse, and also calls itself
2999 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
3001 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3002 struct elf_link_hash_table
*htab
;
3003 const struct elf_backend_data
*bed
;
3005 if (! is_elf_hash_table (eif
->info
->hash
))
3008 /* Ignore indirect symbols. These are added by the versioning code. */
3009 if (h
->root
.type
== bfd_link_hash_indirect
)
3012 /* Fix the symbol flags. */
3013 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
3016 htab
= elf_hash_table (eif
->info
);
3017 bed
= get_elf_backend_data (htab
->dynobj
);
3019 if (h
->root
.type
== bfd_link_hash_undefweak
)
3021 if (eif
->info
->dynamic_undefined_weak
== 0)
3022 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
3023 else if (eif
->info
->dynamic_undefined_weak
> 0
3025 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3026 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
3027 h
->root
.root
.string
))
3029 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3037 /* If this symbol does not require a PLT entry, and it is not
3038 defined by a dynamic object, or is not referenced by a regular
3039 object, ignore it. We do have to handle a weak defined symbol,
3040 even if no regular object refers to it, if we decided to add it
3041 to the dynamic symbol table. FIXME: Do we normally need to worry
3042 about symbols which are defined by one dynamic object and
3043 referenced by another one? */
3045 && h
->type
!= STT_GNU_IFUNC
3049 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3051 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3055 /* If we've already adjusted this symbol, don't do it again. This
3056 can happen via a recursive call. */
3057 if (h
->dynamic_adjusted
)
3060 /* Don't look at this symbol again. Note that we must set this
3061 after checking the above conditions, because we may look at a
3062 symbol once, decide not to do anything, and then get called
3063 recursively later after REF_REGULAR is set below. */
3064 h
->dynamic_adjusted
= 1;
3066 /* If this is a weak definition, and we know a real definition, and
3067 the real symbol is not itself defined by a regular object file,
3068 then get a good value for the real definition. We handle the
3069 real symbol first, for the convenience of the backend routine.
3071 Note that there is a confusing case here. If the real definition
3072 is defined by a regular object file, we don't get the real symbol
3073 from the dynamic object, but we do get the weak symbol. If the
3074 processor backend uses a COPY reloc, then if some routine in the
3075 dynamic object changes the real symbol, we will not see that
3076 change in the corresponding weak symbol. This is the way other
3077 ELF linkers work as well, and seems to be a result of the shared
3080 I will clarify this issue. Most SVR4 shared libraries define the
3081 variable _timezone and define timezone as a weak synonym. The
3082 tzset call changes _timezone. If you write
3083 extern int timezone;
3085 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3086 you might expect that, since timezone is a synonym for _timezone,
3087 the same number will print both times. However, if the processor
3088 backend uses a COPY reloc, then actually timezone will be copied
3089 into your process image, and, since you define _timezone
3090 yourself, _timezone will not. Thus timezone and _timezone will
3091 wind up at different memory locations. The tzset call will set
3092 _timezone, leaving timezone unchanged. */
3094 if (h
->is_weakalias
)
3096 struct elf_link_hash_entry
*def
= weakdef (h
);
3098 /* If we get to this point, there is an implicit reference to
3099 the alias by a regular object file via the weak symbol H. */
3100 def
->ref_regular
= 1;
3102 /* Ensure that the backend adjust_dynamic_symbol function sees
3103 the strong alias before H by recursively calling ourselves. */
3104 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3108 /* If a symbol has no type and no size and does not require a PLT
3109 entry, then we are probably about to do the wrong thing here: we
3110 are probably going to create a COPY reloc for an empty object.
3111 This case can arise when a shared object is built with assembly
3112 code, and the assembly code fails to set the symbol type. */
3114 && h
->type
== STT_NOTYPE
3117 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3118 h
->root
.root
.string
);
3120 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3129 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3133 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3134 struct elf_link_hash_entry
*h
,
3137 unsigned int power_of_two
;
3139 asection
*sec
= h
->root
.u
.def
.section
;
3141 /* The section alignment of the definition is the maximum alignment
3142 requirement of symbols defined in the section. Since we don't
3143 know the symbol alignment requirement, we start with the
3144 maximum alignment and check low bits of the symbol address
3145 for the minimum alignment. */
3146 power_of_two
= bfd_section_alignment (sec
);
3147 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3148 while ((h
->root
.u
.def
.value
& mask
) != 0)
3154 if (power_of_two
> bfd_section_alignment (dynbss
))
3156 /* Adjust the section alignment if needed. */
3157 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3161 /* We make sure that the symbol will be aligned properly. */
3162 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3164 /* Define the symbol as being at this point in DYNBSS. */
3165 h
->root
.u
.def
.section
= dynbss
;
3166 h
->root
.u
.def
.value
= dynbss
->size
;
3168 /* Increment the size of DYNBSS to make room for the symbol. */
3169 dynbss
->size
+= h
->size
;
3171 /* No error if extern_protected_data is true. */
3172 if (h
->protected_def
3173 && (!info
->extern_protected_data
3174 || (info
->extern_protected_data
< 0
3175 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3176 info
->callbacks
->einfo
3177 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3178 h
->root
.root
.string
);
3183 /* Adjust all external symbols pointing into SEC_MERGE sections
3184 to reflect the object merging within the sections. */
3187 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3191 if ((h
->root
.type
== bfd_link_hash_defined
3192 || h
->root
.type
== bfd_link_hash_defweak
)
3193 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3194 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3196 bfd
*output_bfd
= (bfd
*) data
;
3198 h
->root
.u
.def
.value
=
3199 _bfd_merged_section_offset (output_bfd
,
3200 &h
->root
.u
.def
.section
,
3201 elf_section_data (sec
)->sec_info
,
3202 h
->root
.u
.def
.value
);
3208 /* Returns false if the symbol referred to by H should be considered
3209 to resolve local to the current module, and true if it should be
3210 considered to bind dynamically. */
3213 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3214 struct bfd_link_info
*info
,
3215 bfd_boolean not_local_protected
)
3217 bfd_boolean binding_stays_local_p
;
3218 const struct elf_backend_data
*bed
;
3219 struct elf_link_hash_table
*hash_table
;
3224 while (h
->root
.type
== bfd_link_hash_indirect
3225 || h
->root
.type
== bfd_link_hash_warning
)
3226 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3228 /* If it was forced local, then clearly it's not dynamic. */
3229 if (h
->dynindx
== -1)
3231 if (h
->forced_local
)
3234 /* Identify the cases where name binding rules say that a
3235 visible symbol resolves locally. */
3236 binding_stays_local_p
= (bfd_link_executable (info
)
3237 || SYMBOLIC_BIND (info
, h
));
3239 switch (ELF_ST_VISIBILITY (h
->other
))
3246 hash_table
= elf_hash_table (info
);
3247 if (!is_elf_hash_table (hash_table
))
3250 bed
= get_elf_backend_data (hash_table
->dynobj
);
3252 /* Proper resolution for function pointer equality may require
3253 that these symbols perhaps be resolved dynamically, even though
3254 we should be resolving them to the current module. */
3255 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3256 binding_stays_local_p
= TRUE
;
3263 /* If it isn't defined locally, then clearly it's dynamic. */
3264 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3267 /* Otherwise, the symbol is dynamic if binding rules don't tell
3268 us that it remains local. */
3269 return !binding_stays_local_p
;
3272 /* Return true if the symbol referred to by H should be considered
3273 to resolve local to the current module, and false otherwise. Differs
3274 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3275 undefined symbols. The two functions are virtually identical except
3276 for the place where dynindx == -1 is tested. If that test is true,
3277 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3278 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3280 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3281 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3282 treatment of undefined weak symbols. For those that do not make
3283 undefined weak symbols dynamic, both functions may return false. */
3286 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3287 struct bfd_link_info
*info
,
3288 bfd_boolean local_protected
)
3290 const struct elf_backend_data
*bed
;
3291 struct elf_link_hash_table
*hash_table
;
3293 /* If it's a local sym, of course we resolve locally. */
3297 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3298 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3299 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3302 /* Forced local symbols resolve locally. */
3303 if (h
->forced_local
)
3306 /* Common symbols that become definitions don't get the DEF_REGULAR
3307 flag set, so test it first, and don't bail out. */
3308 if (ELF_COMMON_DEF_P (h
))
3310 /* If we don't have a definition in a regular file, then we can't
3311 resolve locally. The sym is either undefined or dynamic. */
3312 else if (!h
->def_regular
)
3315 /* Non-dynamic symbols resolve locally. */
3316 if (h
->dynindx
== -1)
3319 /* At this point, we know the symbol is defined and dynamic. In an
3320 executable it must resolve locally, likewise when building symbolic
3321 shared libraries. */
3322 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3325 /* Now deal with defined dynamic symbols in shared libraries. Ones
3326 with default visibility might not resolve locally. */
3327 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3330 hash_table
= elf_hash_table (info
);
3331 if (!is_elf_hash_table (hash_table
))
3334 bed
= get_elf_backend_data (hash_table
->dynobj
);
3336 /* If extern_protected_data is false, STV_PROTECTED non-function
3337 symbols are local. */
3338 if ((!info
->extern_protected_data
3339 || (info
->extern_protected_data
< 0
3340 && !bed
->extern_protected_data
))
3341 && !bed
->is_function_type (h
->type
))
3344 /* Function pointer equality tests may require that STV_PROTECTED
3345 symbols be treated as dynamic symbols. If the address of a
3346 function not defined in an executable is set to that function's
3347 plt entry in the executable, then the address of the function in
3348 a shared library must also be the plt entry in the executable. */
3349 return local_protected
;
3352 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3353 aligned. Returns the first TLS output section. */
3355 struct bfd_section
*
3356 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3358 struct bfd_section
*sec
, *tls
;
3359 unsigned int align
= 0;
3361 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3362 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3366 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3367 if (sec
->alignment_power
> align
)
3368 align
= sec
->alignment_power
;
3370 elf_hash_table (info
)->tls_sec
= tls
;
3372 /* Ensure the alignment of the first section (usually .tdata) is the largest
3373 alignment, so that the tls segment starts aligned. */
3375 tls
->alignment_power
= align
;
3380 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3382 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3383 Elf_Internal_Sym
*sym
)
3385 const struct elf_backend_data
*bed
;
3387 /* Local symbols do not count, but target specific ones might. */
3388 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3389 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3392 bed
= get_elf_backend_data (abfd
);
3393 /* Function symbols do not count. */
3394 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3397 /* If the section is undefined, then so is the symbol. */
3398 if (sym
->st_shndx
== SHN_UNDEF
)
3401 /* If the symbol is defined in the common section, then
3402 it is a common definition and so does not count. */
3403 if (bed
->common_definition (sym
))
3406 /* If the symbol is in a target specific section then we
3407 must rely upon the backend to tell us what it is. */
3408 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3409 /* FIXME - this function is not coded yet:
3411 return _bfd_is_global_symbol_definition (abfd, sym);
3413 Instead for now assume that the definition is not global,
3414 Even if this is wrong, at least the linker will behave
3415 in the same way that it used to do. */
3421 /* Search the symbol table of the archive element of the archive ABFD
3422 whose archive map contains a mention of SYMDEF, and determine if
3423 the symbol is defined in this element. */
3425 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3427 Elf_Internal_Shdr
* hdr
;
3431 Elf_Internal_Sym
*isymbuf
;
3432 Elf_Internal_Sym
*isym
;
3433 Elf_Internal_Sym
*isymend
;
3436 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3440 if (! bfd_check_format (abfd
, bfd_object
))
3443 /* Select the appropriate symbol table. If we don't know if the
3444 object file is an IR object, give linker LTO plugin a chance to
3445 get the correct symbol table. */
3446 if (abfd
->plugin_format
== bfd_plugin_yes
3447 #if BFD_SUPPORTS_PLUGINS
3448 || (abfd
->plugin_format
== bfd_plugin_unknown
3449 && bfd_link_plugin_object_p (abfd
))
3453 /* Use the IR symbol table if the object has been claimed by
3455 abfd
= abfd
->plugin_dummy_bfd
;
3456 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3458 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3459 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3461 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3463 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3465 /* The sh_info field of the symtab header tells us where the
3466 external symbols start. We don't care about the local symbols. */
3467 if (elf_bad_symtab (abfd
))
3469 extsymcount
= symcount
;
3474 extsymcount
= symcount
- hdr
->sh_info
;
3475 extsymoff
= hdr
->sh_info
;
3478 if (extsymcount
== 0)
3481 /* Read in the symbol table. */
3482 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3484 if (isymbuf
== NULL
)
3487 /* Scan the symbol table looking for SYMDEF. */
3489 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3493 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3498 if (strcmp (name
, symdef
->name
) == 0)
3500 result
= is_global_data_symbol_definition (abfd
, isym
);
3510 /* Add an entry to the .dynamic table. */
3513 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3517 struct elf_link_hash_table
*hash_table
;
3518 const struct elf_backend_data
*bed
;
3520 bfd_size_type newsize
;
3521 bfd_byte
*newcontents
;
3522 Elf_Internal_Dyn dyn
;
3524 hash_table
= elf_hash_table (info
);
3525 if (! is_elf_hash_table (hash_table
))
3528 if (tag
== DT_RELA
|| tag
== DT_REL
)
3529 hash_table
->dynamic_relocs
= TRUE
;
3531 bed
= get_elf_backend_data (hash_table
->dynobj
);
3532 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3533 BFD_ASSERT (s
!= NULL
);
3535 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3536 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3537 if (newcontents
== NULL
)
3541 dyn
.d_un
.d_val
= val
;
3542 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3545 s
->contents
= newcontents
;
3550 /* Strip zero-sized dynamic sections. */
3553 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3555 struct elf_link_hash_table
*hash_table
;
3556 const struct elf_backend_data
*bed
;
3557 asection
*s
, *sdynamic
, **pp
;
3558 asection
*rela_dyn
, *rel_dyn
;
3559 Elf_Internal_Dyn dyn
;
3560 bfd_byte
*extdyn
, *next
;
3561 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3562 bfd_boolean strip_zero_sized
;
3563 bfd_boolean strip_zero_sized_plt
;
3565 if (bfd_link_relocatable (info
))
3568 hash_table
= elf_hash_table (info
);
3569 if (!is_elf_hash_table (hash_table
))
3572 if (!hash_table
->dynobj
)
3575 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3579 bed
= get_elf_backend_data (hash_table
->dynobj
);
3580 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3582 strip_zero_sized
= FALSE
;
3583 strip_zero_sized_plt
= FALSE
;
3585 /* Strip zero-sized dynamic sections. */
3586 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3587 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3588 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3592 || s
== hash_table
->srelplt
->output_section
3593 || s
== hash_table
->splt
->output_section
))
3596 info
->output_bfd
->section_count
--;
3597 strip_zero_sized
= TRUE
;
3602 else if (s
== hash_table
->splt
->output_section
)
3604 s
= hash_table
->splt
;
3605 strip_zero_sized_plt
= TRUE
;
3608 s
= hash_table
->srelplt
;
3609 s
->flags
|= SEC_EXCLUDE
;
3610 s
->output_section
= bfd_abs_section_ptr
;
3615 if (strip_zero_sized_plt
)
3616 for (extdyn
= sdynamic
->contents
;
3617 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3620 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3621 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3629 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3630 the procedure linkage table (the .plt section) has been
3632 memmove (extdyn
, next
,
3633 sdynamic
->size
- (next
- sdynamic
->contents
));
3638 if (strip_zero_sized
)
3640 /* Regenerate program headers. */
3641 elf_seg_map (info
->output_bfd
) = NULL
;
3642 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
);
3648 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3649 1 if a DT_NEEDED tag already exists, and 0 on success. */
3652 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3654 struct elf_link_hash_table
*hash_table
;
3658 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3661 hash_table
= elf_hash_table (info
);
3662 soname
= elf_dt_name (abfd
);
3663 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3664 if (strindex
== (size_t) -1)
3667 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3670 const struct elf_backend_data
*bed
;
3673 bed
= get_elf_backend_data (hash_table
->dynobj
);
3674 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3676 for (extdyn
= sdyn
->contents
;
3677 extdyn
< sdyn
->contents
+ sdyn
->size
;
3678 extdyn
+= bed
->s
->sizeof_dyn
)
3680 Elf_Internal_Dyn dyn
;
3682 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3683 if (dyn
.d_tag
== DT_NEEDED
3684 && dyn
.d_un
.d_val
== strindex
)
3686 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3692 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3695 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3701 /* Return true if SONAME is on the needed list between NEEDED and STOP
3702 (or the end of list if STOP is NULL), and needed by a library that
3706 on_needed_list (const char *soname
,
3707 struct bfd_link_needed_list
*needed
,
3708 struct bfd_link_needed_list
*stop
)
3710 struct bfd_link_needed_list
*look
;
3711 for (look
= needed
; look
!= stop
; look
= look
->next
)
3712 if (strcmp (soname
, look
->name
) == 0
3713 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3714 /* If needed by a library that itself is not directly
3715 needed, recursively check whether that library is
3716 indirectly needed. Since we add DT_NEEDED entries to
3717 the end of the list, library dependencies appear after
3718 the library. Therefore search prior to the current
3719 LOOK, preventing possible infinite recursion. */
3720 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3726 /* Sort symbol by value, section, size, and type. */
3728 elf_sort_symbol (const void *arg1
, const void *arg2
)
3730 const struct elf_link_hash_entry
*h1
;
3731 const struct elf_link_hash_entry
*h2
;
3732 bfd_signed_vma vdiff
;
3737 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3738 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3739 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3741 return vdiff
> 0 ? 1 : -1;
3743 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3747 /* Sort so that sized symbols are selected over zero size symbols. */
3748 vdiff
= h1
->size
- h2
->size
;
3750 return vdiff
> 0 ? 1 : -1;
3752 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3753 if (h1
->type
!= h2
->type
)
3754 return h1
->type
- h2
->type
;
3756 /* If symbols are properly sized and typed, and multiple strong
3757 aliases are not defined in a shared library by the user we
3758 shouldn't get here. Unfortunately linker script symbols like
3759 __bss_start sometimes match a user symbol defined at the start of
3760 .bss without proper size and type. We'd like to preference the
3761 user symbol over reserved system symbols. Sort on leading
3763 n1
= h1
->root
.root
.string
;
3764 n2
= h2
->root
.root
.string
;
3777 /* Final sort on name selects user symbols like '_u' over reserved
3778 system symbols like '_Z' and also will avoid qsort instability. */
3782 /* This function is used to adjust offsets into .dynstr for
3783 dynamic symbols. This is called via elf_link_hash_traverse. */
3786 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3788 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3790 if (h
->dynindx
!= -1)
3791 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3795 /* Assign string offsets in .dynstr, update all structures referencing
3799 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3801 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3802 struct elf_link_local_dynamic_entry
*entry
;
3803 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3804 bfd
*dynobj
= hash_table
->dynobj
;
3807 const struct elf_backend_data
*bed
;
3810 _bfd_elf_strtab_finalize (dynstr
);
3811 size
= _bfd_elf_strtab_size (dynstr
);
3813 /* Allow the linker to examine the dynsymtab now it's fully populated. */
3815 if (info
->callbacks
->examine_strtab
)
3816 info
->callbacks
->examine_strtab (dynstr
);
3818 bed
= get_elf_backend_data (dynobj
);
3819 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3820 BFD_ASSERT (sdyn
!= NULL
);
3822 /* Update all .dynamic entries referencing .dynstr strings. */
3823 for (extdyn
= sdyn
->contents
;
3824 extdyn
< sdyn
->contents
+ sdyn
->size
;
3825 extdyn
+= bed
->s
->sizeof_dyn
)
3827 Elf_Internal_Dyn dyn
;
3829 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3833 dyn
.d_un
.d_val
= size
;
3843 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3848 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3851 /* Now update local dynamic symbols. */
3852 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3853 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3854 entry
->isym
.st_name
);
3856 /* And the rest of dynamic symbols. */
3857 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3859 /* Adjust version definitions. */
3860 if (elf_tdata (output_bfd
)->cverdefs
)
3865 Elf_Internal_Verdef def
;
3866 Elf_Internal_Verdaux defaux
;
3868 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3872 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3874 p
+= sizeof (Elf_External_Verdef
);
3875 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3877 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3879 _bfd_elf_swap_verdaux_in (output_bfd
,
3880 (Elf_External_Verdaux
*) p
, &defaux
);
3881 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3883 _bfd_elf_swap_verdaux_out (output_bfd
,
3884 &defaux
, (Elf_External_Verdaux
*) p
);
3885 p
+= sizeof (Elf_External_Verdaux
);
3888 while (def
.vd_next
);
3891 /* Adjust version references. */
3892 if (elf_tdata (output_bfd
)->verref
)
3897 Elf_Internal_Verneed need
;
3898 Elf_Internal_Vernaux needaux
;
3900 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3904 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3906 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3907 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3908 (Elf_External_Verneed
*) p
);
3909 p
+= sizeof (Elf_External_Verneed
);
3910 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3912 _bfd_elf_swap_vernaux_in (output_bfd
,
3913 (Elf_External_Vernaux
*) p
, &needaux
);
3914 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3916 _bfd_elf_swap_vernaux_out (output_bfd
,
3918 (Elf_External_Vernaux
*) p
);
3919 p
+= sizeof (Elf_External_Vernaux
);
3922 while (need
.vn_next
);
3928 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3929 The default is to only match when the INPUT and OUTPUT are exactly
3933 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3934 const bfd_target
*output
)
3936 return input
== output
;
3939 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3940 This version is used when different targets for the same architecture
3941 are virtually identical. */
3944 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3945 const bfd_target
*output
)
3947 const struct elf_backend_data
*obed
, *ibed
;
3949 if (input
== output
)
3952 ibed
= xvec_get_elf_backend_data (input
);
3953 obed
= xvec_get_elf_backend_data (output
);
3955 if (ibed
->arch
!= obed
->arch
)
3958 /* If both backends are using this function, deem them compatible. */
3959 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3962 /* Make a special call to the linker "notice" function to tell it that
3963 we are about to handle an as-needed lib, or have finished
3964 processing the lib. */
3967 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3968 struct bfd_link_info
*info
,
3969 enum notice_asneeded_action act
)
3971 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3974 /* Check relocations an ELF object file. */
3977 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3979 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3980 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3982 /* If this object is the same format as the output object, and it is
3983 not a shared library, then let the backend look through the
3986 This is required to build global offset table entries and to
3987 arrange for dynamic relocs. It is not required for the
3988 particular common case of linking non PIC code, even when linking
3989 against shared libraries, but unfortunately there is no way of
3990 knowing whether an object file has been compiled PIC or not.
3991 Looking through the relocs is not particularly time consuming.
3992 The problem is that we must either (1) keep the relocs in memory,
3993 which causes the linker to require additional runtime memory or
3994 (2) read the relocs twice from the input file, which wastes time.
3995 This would be a good case for using mmap.
3997 I have no idea how to handle linking PIC code into a file of a
3998 different format. It probably can't be done. */
3999 if ((abfd
->flags
& DYNAMIC
) == 0
4000 && is_elf_hash_table (htab
)
4001 && bed
->check_relocs
!= NULL
4002 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4003 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4007 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4009 Elf_Internal_Rela
*internal_relocs
;
4012 /* Don't check relocations in excluded sections. Don't do
4013 anything special with non-loaded, non-alloced sections.
4014 In particular, any relocs in such sections should not
4015 affect GOT and PLT reference counting (ie. we don't
4016 allow them to create GOT or PLT entries), there's no
4017 possibility or desire to optimize TLS relocs, and
4018 there's not much point in propagating relocs to shared
4019 libs that the dynamic linker won't relocate. */
4020 if ((o
->flags
& SEC_ALLOC
) == 0
4021 || (o
->flags
& SEC_RELOC
) == 0
4022 || (o
->flags
& SEC_EXCLUDE
) != 0
4023 || o
->reloc_count
== 0
4024 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4025 && (o
->flags
& SEC_DEBUGGING
) != 0)
4026 || bfd_is_abs_section (o
->output_section
))
4029 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4031 if (internal_relocs
== NULL
)
4034 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4036 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4037 free (internal_relocs
);
4047 /* Add symbols from an ELF object file to the linker hash table. */
4050 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4052 Elf_Internal_Ehdr
*ehdr
;
4053 Elf_Internal_Shdr
*hdr
;
4057 struct elf_link_hash_entry
**sym_hash
;
4058 bfd_boolean dynamic
;
4059 Elf_External_Versym
*extversym
= NULL
;
4060 Elf_External_Versym
*extversym_end
= NULL
;
4061 Elf_External_Versym
*ever
;
4062 struct elf_link_hash_entry
*weaks
;
4063 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4064 size_t nondeflt_vers_cnt
= 0;
4065 Elf_Internal_Sym
*isymbuf
= NULL
;
4066 Elf_Internal_Sym
*isym
;
4067 Elf_Internal_Sym
*isymend
;
4068 const struct elf_backend_data
*bed
;
4069 bfd_boolean add_needed
;
4070 struct elf_link_hash_table
*htab
;
4071 void *alloc_mark
= NULL
;
4072 struct bfd_hash_entry
**old_table
= NULL
;
4073 unsigned int old_size
= 0;
4074 unsigned int old_count
= 0;
4075 void *old_tab
= NULL
;
4077 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4078 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4079 void *old_strtab
= NULL
;
4082 bfd_boolean just_syms
;
4084 htab
= elf_hash_table (info
);
4085 bed
= get_elf_backend_data (abfd
);
4087 if ((abfd
->flags
& DYNAMIC
) == 0)
4093 /* You can't use -r against a dynamic object. Also, there's no
4094 hope of using a dynamic object which does not exactly match
4095 the format of the output file. */
4096 if (bfd_link_relocatable (info
)
4097 || !is_elf_hash_table (htab
)
4098 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4100 if (bfd_link_relocatable (info
))
4101 bfd_set_error (bfd_error_invalid_operation
);
4103 bfd_set_error (bfd_error_wrong_format
);
4108 ehdr
= elf_elfheader (abfd
);
4109 if (info
->warn_alternate_em
4110 && bed
->elf_machine_code
!= ehdr
->e_machine
4111 && ((bed
->elf_machine_alt1
!= 0
4112 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4113 || (bed
->elf_machine_alt2
!= 0
4114 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4116 /* xgettext:c-format */
4117 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4118 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4120 /* As a GNU extension, any input sections which are named
4121 .gnu.warning.SYMBOL are treated as warning symbols for the given
4122 symbol. This differs from .gnu.warning sections, which generate
4123 warnings when they are included in an output file. */
4124 /* PR 12761: Also generate this warning when building shared libraries. */
4125 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4129 name
= bfd_section_name (s
);
4130 if (CONST_STRNEQ (name
, ".gnu.warning."))
4135 name
+= sizeof ".gnu.warning." - 1;
4137 /* If this is a shared object, then look up the symbol
4138 in the hash table. If it is there, and it is already
4139 been defined, then we will not be using the entry
4140 from this shared object, so we don't need to warn.
4141 FIXME: If we see the definition in a regular object
4142 later on, we will warn, but we shouldn't. The only
4143 fix is to keep track of what warnings we are supposed
4144 to emit, and then handle them all at the end of the
4148 struct elf_link_hash_entry
*h
;
4150 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
4152 /* FIXME: What about bfd_link_hash_common? */
4154 && (h
->root
.type
== bfd_link_hash_defined
4155 || h
->root
.type
== bfd_link_hash_defweak
))
4160 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4164 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4169 if (! (_bfd_generic_link_add_one_symbol
4170 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4171 FALSE
, bed
->collect
, NULL
)))
4174 if (bfd_link_executable (info
))
4176 /* Clobber the section size so that the warning does
4177 not get copied into the output file. */
4180 /* Also set SEC_EXCLUDE, so that symbols defined in
4181 the warning section don't get copied to the output. */
4182 s
->flags
|= SEC_EXCLUDE
;
4187 just_syms
= ((s
= abfd
->sections
) != NULL
4188 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4193 /* If we are creating a shared library, create all the dynamic
4194 sections immediately. We need to attach them to something,
4195 so we attach them to this BFD, provided it is the right
4196 format and is not from ld --just-symbols. Always create the
4197 dynamic sections for -E/--dynamic-list. FIXME: If there
4198 are no input BFD's of the same format as the output, we can't
4199 make a shared library. */
4201 && (bfd_link_pic (info
)
4202 || (!bfd_link_relocatable (info
)
4204 && (info
->export_dynamic
|| info
->dynamic
)))
4205 && is_elf_hash_table (htab
)
4206 && info
->output_bfd
->xvec
== abfd
->xvec
4207 && !htab
->dynamic_sections_created
)
4209 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4213 else if (!is_elf_hash_table (htab
))
4217 const char *soname
= NULL
;
4219 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4220 const Elf_Internal_Phdr
*phdr
;
4221 struct elf_link_loaded_list
*loaded_lib
;
4223 /* ld --just-symbols and dynamic objects don't mix very well.
4224 ld shouldn't allow it. */
4228 /* If this dynamic lib was specified on the command line with
4229 --as-needed in effect, then we don't want to add a DT_NEEDED
4230 tag unless the lib is actually used. Similary for libs brought
4231 in by another lib's DT_NEEDED. When --no-add-needed is used
4232 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4233 any dynamic library in DT_NEEDED tags in the dynamic lib at
4235 add_needed
= (elf_dyn_lib_class (abfd
)
4236 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4237 | DYN_NO_NEEDED
)) == 0;
4239 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4244 unsigned int elfsec
;
4245 unsigned long shlink
;
4247 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4254 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4255 if (elfsec
== SHN_BAD
)
4256 goto error_free_dyn
;
4257 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4259 for (extdyn
= dynbuf
;
4260 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4261 extdyn
+= bed
->s
->sizeof_dyn
)
4263 Elf_Internal_Dyn dyn
;
4265 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4266 if (dyn
.d_tag
== DT_SONAME
)
4268 unsigned int tagv
= dyn
.d_un
.d_val
;
4269 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4271 goto error_free_dyn
;
4273 if (dyn
.d_tag
== DT_NEEDED
)
4275 struct bfd_link_needed_list
*n
, **pn
;
4277 unsigned int tagv
= dyn
.d_un
.d_val
;
4278 size_t amt
= sizeof (struct bfd_link_needed_list
);
4280 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4281 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4282 if (n
== NULL
|| fnm
== NULL
)
4283 goto error_free_dyn
;
4284 amt
= strlen (fnm
) + 1;
4285 anm
= (char *) bfd_alloc (abfd
, amt
);
4287 goto error_free_dyn
;
4288 memcpy (anm
, fnm
, amt
);
4292 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4296 if (dyn
.d_tag
== DT_RUNPATH
)
4298 struct bfd_link_needed_list
*n
, **pn
;
4300 unsigned int tagv
= dyn
.d_un
.d_val
;
4301 size_t amt
= sizeof (struct bfd_link_needed_list
);
4303 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4304 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4305 if (n
== NULL
|| fnm
== NULL
)
4306 goto error_free_dyn
;
4307 amt
= strlen (fnm
) + 1;
4308 anm
= (char *) bfd_alloc (abfd
, amt
);
4310 goto error_free_dyn
;
4311 memcpy (anm
, fnm
, amt
);
4315 for (pn
= & runpath
;
4321 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4322 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4324 struct bfd_link_needed_list
*n
, **pn
;
4326 unsigned int tagv
= dyn
.d_un
.d_val
;
4327 size_t amt
= sizeof (struct bfd_link_needed_list
);
4329 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4330 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4331 if (n
== NULL
|| fnm
== NULL
)
4332 goto error_free_dyn
;
4333 amt
= strlen (fnm
) + 1;
4334 anm
= (char *) bfd_alloc (abfd
, amt
);
4336 goto error_free_dyn
;
4337 memcpy (anm
, fnm
, amt
);
4347 if (dyn
.d_tag
== DT_AUDIT
)
4349 unsigned int tagv
= dyn
.d_un
.d_val
;
4350 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4357 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4358 frees all more recently bfd_alloc'd blocks as well. */
4364 struct bfd_link_needed_list
**pn
;
4365 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4370 /* If we have a PT_GNU_RELRO program header, mark as read-only
4371 all sections contained fully therein. This makes relro
4372 shared library sections appear as they will at run-time. */
4373 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4374 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4375 if (phdr
->p_type
== PT_GNU_RELRO
)
4377 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4379 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4381 if ((s
->flags
& SEC_ALLOC
) != 0
4382 && s
->vma
* opb
>= phdr
->p_vaddr
4383 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4384 s
->flags
|= SEC_READONLY
;
4389 /* We do not want to include any of the sections in a dynamic
4390 object in the output file. We hack by simply clobbering the
4391 list of sections in the BFD. This could be handled more
4392 cleanly by, say, a new section flag; the existing
4393 SEC_NEVER_LOAD flag is not the one we want, because that one
4394 still implies that the section takes up space in the output
4396 bfd_section_list_clear (abfd
);
4398 /* Find the name to use in a DT_NEEDED entry that refers to this
4399 object. If the object has a DT_SONAME entry, we use it.
4400 Otherwise, if the generic linker stuck something in
4401 elf_dt_name, we use that. Otherwise, we just use the file
4403 if (soname
== NULL
|| *soname
== '\0')
4405 soname
= elf_dt_name (abfd
);
4406 if (soname
== NULL
|| *soname
== '\0')
4407 soname
= bfd_get_filename (abfd
);
4410 /* Save the SONAME because sometimes the linker emulation code
4411 will need to know it. */
4412 elf_dt_name (abfd
) = soname
;
4414 /* If we have already included this dynamic object in the
4415 link, just ignore it. There is no reason to include a
4416 particular dynamic object more than once. */
4417 for (loaded_lib
= htab
->dyn_loaded
;
4419 loaded_lib
= loaded_lib
->next
)
4421 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4425 /* Create dynamic sections for backends that require that be done
4426 before setup_gnu_properties. */
4428 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4431 /* Save the DT_AUDIT entry for the linker emulation code. */
4432 elf_dt_audit (abfd
) = audit
;
4435 /* If this is a dynamic object, we always link against the .dynsym
4436 symbol table, not the .symtab symbol table. The dynamic linker
4437 will only see the .dynsym symbol table, so there is no reason to
4438 look at .symtab for a dynamic object. */
4440 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4441 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4443 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4445 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4447 /* The sh_info field of the symtab header tells us where the
4448 external symbols start. We don't care about the local symbols at
4450 if (elf_bad_symtab (abfd
))
4452 extsymcount
= symcount
;
4457 extsymcount
= symcount
- hdr
->sh_info
;
4458 extsymoff
= hdr
->sh_info
;
4461 sym_hash
= elf_sym_hashes (abfd
);
4462 if (extsymcount
!= 0)
4464 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4466 if (isymbuf
== NULL
)
4469 if (sym_hash
== NULL
)
4471 /* We store a pointer to the hash table entry for each
4473 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4474 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4475 if (sym_hash
== NULL
)
4476 goto error_free_sym
;
4477 elf_sym_hashes (abfd
) = sym_hash
;
4483 /* Read in any version definitions. */
4484 if (!_bfd_elf_slurp_version_tables (abfd
,
4485 info
->default_imported_symver
))
4486 goto error_free_sym
;
4488 /* Read in the symbol versions, but don't bother to convert them
4489 to internal format. */
4490 if (elf_dynversym (abfd
) != 0)
4492 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4493 bfd_size_type amt
= versymhdr
->sh_size
;
4495 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4496 goto error_free_sym
;
4497 extversym
= (Elf_External_Versym
*)
4498 _bfd_malloc_and_read (abfd
, amt
, amt
);
4499 if (extversym
== NULL
)
4500 goto error_free_sym
;
4501 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4505 /* If we are loading an as-needed shared lib, save the symbol table
4506 state before we start adding symbols. If the lib turns out
4507 to be unneeded, restore the state. */
4508 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4513 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4515 struct bfd_hash_entry
*p
;
4516 struct elf_link_hash_entry
*h
;
4518 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4520 h
= (struct elf_link_hash_entry
*) p
;
4521 entsize
+= htab
->root
.table
.entsize
;
4522 if (h
->root
.type
== bfd_link_hash_warning
)
4524 entsize
+= htab
->root
.table
.entsize
;
4525 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4527 if (h
->root
.type
== bfd_link_hash_common
)
4528 entsize
+= sizeof (*h
->root
.u
.c
.p
);
4532 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4533 old_tab
= bfd_malloc (tabsize
+ entsize
);
4534 if (old_tab
== NULL
)
4535 goto error_free_vers
;
4537 /* Remember the current objalloc pointer, so that all mem for
4538 symbols added can later be reclaimed. */
4539 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4540 if (alloc_mark
== NULL
)
4541 goto error_free_vers
;
4543 /* Make a special call to the linker "notice" function to
4544 tell it that we are about to handle an as-needed lib. */
4545 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4546 goto error_free_vers
;
4548 /* Clone the symbol table. Remember some pointers into the
4549 symbol table, and dynamic symbol count. */
4550 old_ent
= (char *) old_tab
+ tabsize
;
4551 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4552 old_undefs
= htab
->root
.undefs
;
4553 old_undefs_tail
= htab
->root
.undefs_tail
;
4554 old_table
= htab
->root
.table
.table
;
4555 old_size
= htab
->root
.table
.size
;
4556 old_count
= htab
->root
.table
.count
;
4558 if (htab
->dynstr
!= NULL
)
4560 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4561 if (old_strtab
== NULL
)
4562 goto error_free_vers
;
4565 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4567 struct bfd_hash_entry
*p
;
4568 struct elf_link_hash_entry
*h
;
4570 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4572 h
= (struct elf_link_hash_entry
*) p
;
4573 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4574 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4575 if (h
->root
.type
== bfd_link_hash_warning
)
4577 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4578 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4579 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4581 if (h
->root
.type
== bfd_link_hash_common
)
4583 memcpy (old_ent
, h
->root
.u
.c
.p
, sizeof (*h
->root
.u
.c
.p
));
4584 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
4591 if (extversym
== NULL
)
4593 else if (extversym
+ extsymoff
< extversym_end
)
4594 ever
= extversym
+ extsymoff
;
4597 /* xgettext:c-format */
4598 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4599 abfd
, (long) extsymoff
,
4600 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4601 bfd_set_error (bfd_error_bad_value
);
4602 goto error_free_vers
;
4605 if (!bfd_link_relocatable (info
)
4606 && abfd
->lto_slim_object
)
4609 (_("%pB: plugin needed to handle lto object"), abfd
);
4612 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4614 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4618 asection
*sec
, *new_sec
;
4621 struct elf_link_hash_entry
*h
;
4622 struct elf_link_hash_entry
*hi
;
4623 bfd_boolean definition
;
4624 bfd_boolean size_change_ok
;
4625 bfd_boolean type_change_ok
;
4626 bfd_boolean new_weak
;
4627 bfd_boolean old_weak
;
4630 bfd_boolean discarded
;
4631 unsigned int old_alignment
;
4632 unsigned int shindex
;
4634 bfd_boolean matched
;
4638 flags
= BSF_NO_FLAGS
;
4640 value
= isym
->st_value
;
4641 common
= bed
->common_definition (isym
);
4642 if (common
&& info
->inhibit_common_definition
)
4644 /* Treat common symbol as undefined for --no-define-common. */
4645 isym
->st_shndx
= SHN_UNDEF
;
4650 bind
= ELF_ST_BIND (isym
->st_info
);
4654 /* This should be impossible, since ELF requires that all
4655 global symbols follow all local symbols, and that sh_info
4656 point to the first global symbol. Unfortunately, Irix 5
4658 if (elf_bad_symtab (abfd
))
4661 /* If we aren't prepared to handle locals within the globals
4662 then we'll likely segfault on a NULL symbol hash if the
4663 symbol is ever referenced in relocations. */
4664 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4665 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4666 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4667 " (>= sh_info of %lu)"),
4668 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4671 /* Dynamic object relocations are not processed by ld, so
4672 ld won't run into the problem mentioned above. */
4675 bfd_set_error (bfd_error_bad_value
);
4676 goto error_free_vers
;
4679 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4687 case STB_GNU_UNIQUE
:
4688 flags
= BSF_GNU_UNIQUE
;
4692 /* Leave it up to the processor backend. */
4696 if (isym
->st_shndx
== SHN_UNDEF
)
4697 sec
= bfd_und_section_ptr
;
4698 else if (isym
->st_shndx
== SHN_ABS
)
4699 sec
= bfd_abs_section_ptr
;
4700 else if (isym
->st_shndx
== SHN_COMMON
)
4702 sec
= bfd_com_section_ptr
;
4703 /* What ELF calls the size we call the value. What ELF
4704 calls the value we call the alignment. */
4705 value
= isym
->st_size
;
4709 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4711 sec
= bfd_abs_section_ptr
;
4712 else if (discarded_section (sec
))
4714 /* Symbols from discarded section are undefined. We keep
4716 sec
= bfd_und_section_ptr
;
4718 isym
->st_shndx
= SHN_UNDEF
;
4720 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4724 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4727 goto error_free_vers
;
4729 if (isym
->st_shndx
== SHN_COMMON
4730 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4732 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4736 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4738 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4740 goto error_free_vers
;
4744 else if (isym
->st_shndx
== SHN_COMMON
4745 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4746 && !bfd_link_relocatable (info
))
4748 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4752 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4753 | SEC_LINKER_CREATED
);
4754 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4756 goto error_free_vers
;
4760 else if (bed
->elf_add_symbol_hook
)
4762 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4764 goto error_free_vers
;
4766 /* The hook function sets the name to NULL if this symbol
4767 should be skipped for some reason. */
4772 /* Sanity check that all possibilities were handled. */
4776 /* Silently discard TLS symbols from --just-syms. There's
4777 no way to combine a static TLS block with a new TLS block
4778 for this executable. */
4779 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4780 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4783 if (bfd_is_und_section (sec
)
4784 || bfd_is_com_section (sec
))
4789 size_change_ok
= FALSE
;
4790 type_change_ok
= bed
->type_change_ok
;
4797 if (is_elf_hash_table (htab
))
4799 Elf_Internal_Versym iver
;
4800 unsigned int vernum
= 0;
4805 if (info
->default_imported_symver
)
4806 /* Use the default symbol version created earlier. */
4807 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4811 else if (ever
>= extversym_end
)
4813 /* xgettext:c-format */
4814 _bfd_error_handler (_("%pB: not enough version information"),
4816 bfd_set_error (bfd_error_bad_value
);
4817 goto error_free_vers
;
4820 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4822 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4824 /* If this is a hidden symbol, or if it is not version
4825 1, we append the version name to the symbol name.
4826 However, we do not modify a non-hidden absolute symbol
4827 if it is not a function, because it might be the version
4828 symbol itself. FIXME: What if it isn't? */
4829 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4831 && (!bfd_is_abs_section (sec
)
4832 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4835 size_t namelen
, verlen
, newlen
;
4838 if (isym
->st_shndx
!= SHN_UNDEF
)
4840 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4842 else if (vernum
> 1)
4844 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4851 /* xgettext:c-format */
4852 (_("%pB: %s: invalid version %u (max %d)"),
4854 elf_tdata (abfd
)->cverdefs
);
4855 bfd_set_error (bfd_error_bad_value
);
4856 goto error_free_vers
;
4861 /* We cannot simply test for the number of
4862 entries in the VERNEED section since the
4863 numbers for the needed versions do not start
4865 Elf_Internal_Verneed
*t
;
4868 for (t
= elf_tdata (abfd
)->verref
;
4872 Elf_Internal_Vernaux
*a
;
4874 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4876 if (a
->vna_other
== vernum
)
4878 verstr
= a
->vna_nodename
;
4888 /* xgettext:c-format */
4889 (_("%pB: %s: invalid needed version %d"),
4890 abfd
, name
, vernum
);
4891 bfd_set_error (bfd_error_bad_value
);
4892 goto error_free_vers
;
4896 namelen
= strlen (name
);
4897 verlen
= strlen (verstr
);
4898 newlen
= namelen
+ verlen
+ 2;
4899 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4900 && isym
->st_shndx
!= SHN_UNDEF
)
4903 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4904 if (newname
== NULL
)
4905 goto error_free_vers
;
4906 memcpy (newname
, name
, namelen
);
4907 p
= newname
+ namelen
;
4909 /* If this is a defined non-hidden version symbol,
4910 we add another @ to the name. This indicates the
4911 default version of the symbol. */
4912 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4913 && isym
->st_shndx
!= SHN_UNDEF
)
4915 memcpy (p
, verstr
, verlen
+ 1);
4920 /* If this symbol has default visibility and the user has
4921 requested we not re-export it, then mark it as hidden. */
4922 if (!bfd_is_und_section (sec
)
4925 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4926 isym
->st_other
= (STV_HIDDEN
4927 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4929 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4930 sym_hash
, &old_bfd
, &old_weak
,
4931 &old_alignment
, &skip
, &override
,
4932 &type_change_ok
, &size_change_ok
,
4934 goto error_free_vers
;
4939 /* Override a definition only if the new symbol matches the
4941 if (override
&& matched
)
4945 while (h
->root
.type
== bfd_link_hash_indirect
4946 || h
->root
.type
== bfd_link_hash_warning
)
4947 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4949 if (elf_tdata (abfd
)->verdef
!= NULL
4952 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4955 if (! (_bfd_generic_link_add_one_symbol
4956 (info
, override
? override
: abfd
, name
, flags
, sec
, value
,
4957 NULL
, FALSE
, bed
->collect
,
4958 (struct bfd_link_hash_entry
**) sym_hash
)))
4959 goto error_free_vers
;
4962 /* We need to make sure that indirect symbol dynamic flags are
4965 while (h
->root
.type
== bfd_link_hash_indirect
4966 || h
->root
.type
== bfd_link_hash_warning
)
4967 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4969 /* Setting the index to -3 tells elf_link_output_extsym that
4970 this symbol is defined in a discarded section. */
4976 new_weak
= (flags
& BSF_WEAK
) != 0;
4980 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4981 && is_elf_hash_table (htab
)
4982 && h
->u
.alias
== NULL
)
4984 /* Keep a list of all weak defined non function symbols from
4985 a dynamic object, using the alias field. Later in this
4986 function we will set the alias field to the correct
4987 value. We only put non-function symbols from dynamic
4988 objects on this list, because that happens to be the only
4989 time we need to know the normal symbol corresponding to a
4990 weak symbol, and the information is time consuming to
4991 figure out. If the alias field is not already NULL,
4992 then this symbol was already defined by some previous
4993 dynamic object, and we will be using that previous
4994 definition anyhow. */
5000 /* Set the alignment of a common symbol. */
5001 if ((common
|| bfd_is_com_section (sec
))
5002 && h
->root
.type
== bfd_link_hash_common
)
5007 align
= bfd_log2 (isym
->st_value
);
5010 /* The new symbol is a common symbol in a shared object.
5011 We need to get the alignment from the section. */
5012 align
= new_sec
->alignment_power
;
5014 if (align
> old_alignment
)
5015 h
->root
.u
.c
.p
->alignment_power
= align
;
5017 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
5020 if (is_elf_hash_table (htab
))
5022 /* Set a flag in the hash table entry indicating the type of
5023 reference or definition we just found. A dynamic symbol
5024 is one which is referenced or defined by both a regular
5025 object and a shared object. */
5026 bfd_boolean dynsym
= FALSE
;
5028 /* Plugin symbols aren't normal. Don't set def/ref flags. */
5029 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5036 if (bind
!= STB_WEAK
)
5037 h
->ref_regular_nonweak
= 1;
5054 hi
->ref_dynamic
= 1;
5059 hi
->def_dynamic
= 1;
5063 /* If an indirect symbol has been forced local, don't
5064 make the real symbol dynamic. */
5065 if (h
!= hi
&& hi
->forced_local
)
5069 if (bfd_link_dll (info
)
5079 && weakdef (h
)->dynindx
!= -1))
5083 /* Check to see if we need to add an indirect symbol for
5084 the default name. */
5086 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5088 && hi
->versioned
== versioned_hidden
))
5089 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5090 sec
, value
, &old_bfd
, &dynsym
))
5091 goto error_free_vers
;
5093 /* Check the alignment when a common symbol is involved. This
5094 can change when a common symbol is overridden by a normal
5095 definition or a common symbol is ignored due to the old
5096 normal definition. We need to make sure the maximum
5097 alignment is maintained. */
5098 if ((old_alignment
|| common
)
5099 && h
->root
.type
!= bfd_link_hash_common
)
5101 unsigned int common_align
;
5102 unsigned int normal_align
;
5103 unsigned int symbol_align
;
5107 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5108 || h
->root
.type
== bfd_link_hash_defweak
);
5110 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5111 if (h
->root
.u
.def
.section
->owner
!= NULL
5112 && (h
->root
.u
.def
.section
->owner
->flags
5113 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5115 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5116 if (normal_align
> symbol_align
)
5117 normal_align
= symbol_align
;
5120 normal_align
= symbol_align
;
5124 common_align
= old_alignment
;
5125 common_bfd
= old_bfd
;
5130 common_align
= bfd_log2 (isym
->st_value
);
5132 normal_bfd
= old_bfd
;
5135 if (normal_align
< common_align
)
5137 /* PR binutils/2735 */
5138 if (normal_bfd
== NULL
)
5140 /* xgettext:c-format */
5141 (_("warning: alignment %u of common symbol `%s' in %pB is"
5142 " greater than the alignment (%u) of its section %pA"),
5143 1 << common_align
, name
, common_bfd
,
5144 1 << normal_align
, h
->root
.u
.def
.section
);
5147 /* xgettext:c-format */
5148 (_("warning: alignment %u of symbol `%s' in %pB"
5149 " is smaller than %u in %pB"),
5150 1 << normal_align
, name
, normal_bfd
,
5151 1 << common_align
, common_bfd
);
5155 /* Remember the symbol size if it isn't undefined. */
5156 if (isym
->st_size
!= 0
5157 && isym
->st_shndx
!= SHN_UNDEF
5158 && (definition
|| h
->size
== 0))
5161 && h
->size
!= isym
->st_size
5162 && ! size_change_ok
)
5164 /* xgettext:c-format */
5165 (_("warning: size of symbol `%s' changed"
5166 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5167 name
, (uint64_t) h
->size
, old_bfd
,
5168 (uint64_t) isym
->st_size
, abfd
);
5170 h
->size
= isym
->st_size
;
5173 /* If this is a common symbol, then we always want H->SIZE
5174 to be the size of the common symbol. The code just above
5175 won't fix the size if a common symbol becomes larger. We
5176 don't warn about a size change here, because that is
5177 covered by --warn-common. Allow changes between different
5179 if (h
->root
.type
== bfd_link_hash_common
)
5180 h
->size
= h
->root
.u
.c
.size
;
5182 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5183 && ((definition
&& !new_weak
)
5184 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5185 || h
->type
== STT_NOTYPE
))
5187 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5189 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5191 if (type
== STT_GNU_IFUNC
5192 && (abfd
->flags
& DYNAMIC
) != 0)
5195 if (h
->type
!= type
)
5197 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5198 /* xgettext:c-format */
5200 (_("warning: type of symbol `%s' changed"
5201 " from %d to %d in %pB"),
5202 name
, h
->type
, type
, abfd
);
5208 /* Merge st_other field. */
5209 elf_merge_st_other (abfd
, h
, isym
->st_other
, sec
,
5210 definition
, dynamic
);
5212 /* We don't want to make debug symbol dynamic. */
5214 && (sec
->flags
& SEC_DEBUGGING
)
5215 && !bfd_link_relocatable (info
))
5218 /* Nor should we make plugin symbols dynamic. */
5219 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5224 h
->target_internal
= isym
->st_target_internal
;
5225 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5228 if (definition
&& !dynamic
)
5230 char *p
= strchr (name
, ELF_VER_CHR
);
5231 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5233 /* Queue non-default versions so that .symver x, x@FOO
5234 aliases can be checked. */
5237 size_t amt
= ((isymend
- isym
+ 1)
5238 * sizeof (struct elf_link_hash_entry
*));
5240 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5242 goto error_free_vers
;
5244 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5248 if (dynsym
&& h
->dynindx
== -1)
5250 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5251 goto error_free_vers
;
5253 && weakdef (h
)->dynindx
== -1)
5255 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5256 goto error_free_vers
;
5259 else if (h
->dynindx
!= -1)
5260 /* If the symbol already has a dynamic index, but
5261 visibility says it should not be visible, turn it into
5263 switch (ELF_ST_VISIBILITY (h
->other
))
5267 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
5276 && h
->ref_regular_nonweak
)
5278 && (old_bfd
->flags
& BFD_PLUGIN
) != 0
5279 && bind
!= STB_WEAK
)
5280 || (h
->ref_dynamic_nonweak
5281 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5282 && !on_needed_list (elf_dt_name (abfd
),
5283 htab
->needed
, NULL
))))
5285 const char *soname
= elf_dt_name (abfd
);
5287 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5288 h
->root
.root
.string
);
5290 /* A symbol from a library loaded via DT_NEEDED of some
5291 other library is referenced by a regular object.
5292 Add a DT_NEEDED entry for it. Issue an error if
5293 --no-add-needed is used and the reference was not
5296 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5299 /* xgettext:c-format */
5300 (_("%pB: undefined reference to symbol '%s'"),
5302 bfd_set_error (bfd_error_missing_dso
);
5303 goto error_free_vers
;
5306 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5307 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5309 /* Create dynamic sections for backends that require
5310 that be done before setup_gnu_properties. */
5311 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5318 if (info
->lto_plugin_active
5319 && !bfd_link_relocatable (info
)
5320 && (abfd
->flags
& BFD_PLUGIN
) == 0
5326 if (bed
->s
->arch_size
== 32)
5331 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5332 referenced in regular objects so that linker plugin will get
5333 the correct symbol resolution. */
5335 sym_hash
= elf_sym_hashes (abfd
);
5336 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5338 Elf_Internal_Rela
*internal_relocs
;
5339 Elf_Internal_Rela
*rel
, *relend
;
5341 /* Don't check relocations in excluded sections. */
5342 if ((s
->flags
& SEC_RELOC
) == 0
5343 || s
->reloc_count
== 0
5344 || (s
->flags
& SEC_EXCLUDE
) != 0
5345 || ((info
->strip
== strip_all
5346 || info
->strip
== strip_debugger
)
5347 && (s
->flags
& SEC_DEBUGGING
) != 0))
5350 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5353 if (internal_relocs
== NULL
)
5354 goto error_free_vers
;
5356 rel
= internal_relocs
;
5357 relend
= rel
+ s
->reloc_count
;
5358 for ( ; rel
< relend
; rel
++)
5360 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5361 struct elf_link_hash_entry
*h
;
5363 /* Skip local symbols. */
5364 if (r_symndx
< extsymoff
)
5367 h
= sym_hash
[r_symndx
- extsymoff
];
5369 h
->root
.non_ir_ref_regular
= 1;
5372 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5373 free (internal_relocs
);
5382 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5386 /* Restore the symbol table. */
5387 old_ent
= (char *) old_tab
+ tabsize
;
5388 memset (elf_sym_hashes (abfd
), 0,
5389 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5390 htab
->root
.table
.table
= old_table
;
5391 htab
->root
.table
.size
= old_size
;
5392 htab
->root
.table
.count
= old_count
;
5393 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5394 htab
->root
.undefs
= old_undefs
;
5395 htab
->root
.undefs_tail
= old_undefs_tail
;
5396 if (htab
->dynstr
!= NULL
)
5397 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5400 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5402 struct bfd_hash_entry
*p
;
5403 struct elf_link_hash_entry
*h
;
5404 unsigned int non_ir_ref_dynamic
;
5406 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5408 /* Preserve non_ir_ref_dynamic so that this symbol
5409 will be exported when the dynamic lib becomes needed
5410 in the second pass. */
5411 h
= (struct elf_link_hash_entry
*) p
;
5412 if (h
->root
.type
== bfd_link_hash_warning
)
5413 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5414 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5416 h
= (struct elf_link_hash_entry
*) p
;
5417 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5418 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5419 if (h
->root
.type
== bfd_link_hash_warning
)
5421 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5422 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5423 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5425 if (h
->root
.type
== bfd_link_hash_common
)
5427 memcpy (h
->root
.u
.c
.p
, old_ent
, sizeof (*h
->root
.u
.c
.p
));
5428 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
5430 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5434 /* Make a special call to the linker "notice" function to
5435 tell it that symbols added for crefs may need to be removed. */
5436 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5437 goto error_free_vers
;
5440 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5442 free (nondeflt_vers
);
5446 if (old_tab
!= NULL
)
5448 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5449 goto error_free_vers
;
5454 /* Now that all the symbols from this input file are created, if
5455 not performing a relocatable link, handle .symver foo, foo@BAR
5456 such that any relocs against foo become foo@BAR. */
5457 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5461 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5463 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5464 char *shortname
, *p
;
5467 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5469 || (h
->root
.type
!= bfd_link_hash_defined
5470 && h
->root
.type
!= bfd_link_hash_defweak
))
5473 amt
= p
- h
->root
.root
.string
;
5474 shortname
= (char *) bfd_malloc (amt
+ 1);
5476 goto error_free_vers
;
5477 memcpy (shortname
, h
->root
.root
.string
, amt
);
5478 shortname
[amt
] = '\0';
5480 hi
= (struct elf_link_hash_entry
*)
5481 bfd_link_hash_lookup (&htab
->root
, shortname
,
5482 FALSE
, FALSE
, FALSE
);
5484 && hi
->root
.type
== h
->root
.type
5485 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5486 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5488 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
5489 hi
->root
.type
= bfd_link_hash_indirect
;
5490 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5491 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5492 sym_hash
= elf_sym_hashes (abfd
);
5494 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5495 if (sym_hash
[symidx
] == hi
)
5497 sym_hash
[symidx
] = h
;
5503 free (nondeflt_vers
);
5504 nondeflt_vers
= NULL
;
5507 /* Now set the alias field correctly for all the weak defined
5508 symbols we found. The only way to do this is to search all the
5509 symbols. Since we only need the information for non functions in
5510 dynamic objects, that's the only time we actually put anything on
5511 the list WEAKS. We need this information so that if a regular
5512 object refers to a symbol defined weakly in a dynamic object, the
5513 real symbol in the dynamic object is also put in the dynamic
5514 symbols; we also must arrange for both symbols to point to the
5515 same memory location. We could handle the general case of symbol
5516 aliasing, but a general symbol alias can only be generated in
5517 assembler code, handling it correctly would be very time
5518 consuming, and other ELF linkers don't handle general aliasing
5522 struct elf_link_hash_entry
**hpp
;
5523 struct elf_link_hash_entry
**hppend
;
5524 struct elf_link_hash_entry
**sorted_sym_hash
;
5525 struct elf_link_hash_entry
*h
;
5526 size_t sym_count
, amt
;
5528 /* Since we have to search the whole symbol list for each weak
5529 defined symbol, search time for N weak defined symbols will be
5530 O(N^2). Binary search will cut it down to O(NlogN). */
5531 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5532 sorted_sym_hash
= bfd_malloc (amt
);
5533 if (sorted_sym_hash
== NULL
)
5535 sym_hash
= sorted_sym_hash
;
5536 hpp
= elf_sym_hashes (abfd
);
5537 hppend
= hpp
+ extsymcount
;
5539 for (; hpp
< hppend
; hpp
++)
5543 && h
->root
.type
== bfd_link_hash_defined
5544 && !bed
->is_function_type (h
->type
))
5552 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5555 while (weaks
!= NULL
)
5557 struct elf_link_hash_entry
*hlook
;
5560 size_t i
, j
, idx
= 0;
5563 weaks
= hlook
->u
.alias
;
5564 hlook
->u
.alias
= NULL
;
5566 if (hlook
->root
.type
!= bfd_link_hash_defined
5567 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5570 slook
= hlook
->root
.u
.def
.section
;
5571 vlook
= hlook
->root
.u
.def
.value
;
5577 bfd_signed_vma vdiff
;
5579 h
= sorted_sym_hash
[idx
];
5580 vdiff
= vlook
- h
->root
.u
.def
.value
;
5587 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5597 /* We didn't find a value/section match. */
5601 /* With multiple aliases, or when the weak symbol is already
5602 strongly defined, we have multiple matching symbols and
5603 the binary search above may land on any of them. Step
5604 one past the matching symbol(s). */
5607 h
= sorted_sym_hash
[idx
];
5608 if (h
->root
.u
.def
.section
!= slook
5609 || h
->root
.u
.def
.value
!= vlook
)
5613 /* Now look back over the aliases. Since we sorted by size
5614 as well as value and section, we'll choose the one with
5615 the largest size. */
5618 h
= sorted_sym_hash
[idx
];
5620 /* Stop if value or section doesn't match. */
5621 if (h
->root
.u
.def
.section
!= slook
5622 || h
->root
.u
.def
.value
!= vlook
)
5624 else if (h
!= hlook
)
5626 struct elf_link_hash_entry
*t
;
5629 hlook
->is_weakalias
= 1;
5631 if (t
->u
.alias
!= NULL
)
5632 while (t
->u
.alias
!= h
)
5636 /* If the weak definition is in the list of dynamic
5637 symbols, make sure the real definition is put
5639 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5641 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5644 free (sorted_sym_hash
);
5649 /* If the real definition is in the list of dynamic
5650 symbols, make sure the weak definition is put
5651 there as well. If we don't do this, then the
5652 dynamic loader might not merge the entries for the
5653 real definition and the weak definition. */
5654 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5656 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5657 goto err_free_sym_hash
;
5664 free (sorted_sym_hash
);
5667 if (bed
->check_directives
5668 && !(*bed
->check_directives
) (abfd
, info
))
5671 /* If this is a non-traditional link, try to optimize the handling
5672 of the .stab/.stabstr sections. */
5674 && ! info
->traditional_format
5675 && is_elf_hash_table (htab
)
5676 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5680 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5681 if (stabstr
!= NULL
)
5683 bfd_size_type string_offset
= 0;
5686 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5687 if (CONST_STRNEQ (stab
->name
, ".stab")
5688 && (!stab
->name
[5] ||
5689 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5690 && (stab
->flags
& SEC_MERGE
) == 0
5691 && !bfd_is_abs_section (stab
->output_section
))
5693 struct bfd_elf_section_data
*secdata
;
5695 secdata
= elf_section_data (stab
);
5696 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5697 stabstr
, &secdata
->sec_info
,
5700 if (secdata
->sec_info
)
5701 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5706 if (dynamic
&& add_needed
)
5708 /* Add this bfd to the loaded list. */
5709 struct elf_link_loaded_list
*n
;
5711 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5715 n
->next
= htab
->dyn_loaded
;
5716 htab
->dyn_loaded
= n
;
5718 if (dynamic
&& !add_needed
5719 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5720 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5727 free (nondeflt_vers
);
5735 /* Return the linker hash table entry of a symbol that might be
5736 satisfied by an archive symbol. Return -1 on error. */
5738 struct elf_link_hash_entry
*
5739 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5740 struct bfd_link_info
*info
,
5743 struct elf_link_hash_entry
*h
;
5747 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
5751 /* If this is a default version (the name contains @@), look up the
5752 symbol again with only one `@' as well as without the version.
5753 The effect is that references to the symbol with and without the
5754 version will be matched by the default symbol in the archive. */
5756 p
= strchr (name
, ELF_VER_CHR
);
5757 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5760 /* First check with only one `@'. */
5761 len
= strlen (name
);
5762 copy
= (char *) bfd_alloc (abfd
, len
);
5764 return (struct elf_link_hash_entry
*) -1;
5766 first
= p
- name
+ 1;
5767 memcpy (copy
, name
, first
);
5768 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5770 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
5773 /* We also need to check references to the symbol without the
5775 copy
[first
- 1] = '\0';
5776 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5777 FALSE
, FALSE
, TRUE
);
5780 bfd_release (abfd
, copy
);
5784 /* Add symbols from an ELF archive file to the linker hash table. We
5785 don't use _bfd_generic_link_add_archive_symbols because we need to
5786 handle versioned symbols.
5788 Fortunately, ELF archive handling is simpler than that done by
5789 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5790 oddities. In ELF, if we find a symbol in the archive map, and the
5791 symbol is currently undefined, we know that we must pull in that
5794 Unfortunately, we do have to make multiple passes over the symbol
5795 table until nothing further is resolved. */
5798 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5801 unsigned char *included
= NULL
;
5805 const struct elf_backend_data
*bed
;
5806 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5807 (bfd
*, struct bfd_link_info
*, const char *);
5809 if (! bfd_has_map (abfd
))
5811 /* An empty archive is a special case. */
5812 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5814 bfd_set_error (bfd_error_no_armap
);
5818 /* Keep track of all symbols we know to be already defined, and all
5819 files we know to be already included. This is to speed up the
5820 second and subsequent passes. */
5821 c
= bfd_ardata (abfd
)->symdef_count
;
5824 amt
= c
* sizeof (*included
);
5825 included
= (unsigned char *) bfd_zmalloc (amt
);
5826 if (included
== NULL
)
5829 symdefs
= bfd_ardata (abfd
)->symdefs
;
5830 bed
= get_elf_backend_data (abfd
);
5831 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5844 symdefend
= symdef
+ c
;
5845 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5847 struct elf_link_hash_entry
*h
;
5849 struct bfd_link_hash_entry
*undefs_tail
;
5854 if (symdef
->file_offset
== last
)
5860 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5861 if (h
== (struct elf_link_hash_entry
*) -1)
5867 if (h
->root
.type
== bfd_link_hash_undefined
)
5869 /* If the archive element has already been loaded then one
5870 of the symbols defined by that element might have been
5871 made undefined due to being in a discarded section. */
5875 else if (h
->root
.type
== bfd_link_hash_common
)
5877 /* We currently have a common symbol. The archive map contains
5878 a reference to this symbol, so we may want to include it. We
5879 only want to include it however, if this archive element
5880 contains a definition of the symbol, not just another common
5883 Unfortunately some archivers (including GNU ar) will put
5884 declarations of common symbols into their archive maps, as
5885 well as real definitions, so we cannot just go by the archive
5886 map alone. Instead we must read in the element's symbol
5887 table and check that to see what kind of symbol definition
5889 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5894 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5895 /* Symbol must be defined. Don't check it again. */
5900 /* We need to include this archive member. */
5901 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5902 if (element
== NULL
)
5905 if (! bfd_check_format (element
, bfd_object
))
5908 undefs_tail
= info
->hash
->undefs_tail
;
5910 if (!(*info
->callbacks
5911 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5913 if (!bfd_link_add_symbols (element
, info
))
5916 /* If there are any new undefined symbols, we need to make
5917 another pass through the archive in order to see whether
5918 they can be defined. FIXME: This isn't perfect, because
5919 common symbols wind up on undefs_tail and because an
5920 undefined symbol which is defined later on in this pass
5921 does not require another pass. This isn't a bug, but it
5922 does make the code less efficient than it could be. */
5923 if (undefs_tail
!= info
->hash
->undefs_tail
)
5926 /* Look backward to mark all symbols from this object file
5927 which we have already seen in this pass. */
5931 included
[mark
] = TRUE
;
5936 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5938 /* We mark subsequent symbols from this object file as we go
5939 on through the loop. */
5940 last
= symdef
->file_offset
;
5953 /* Given an ELF BFD, add symbols to the global hash table as
5957 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5959 switch (bfd_get_format (abfd
))
5962 return elf_link_add_object_symbols (abfd
, info
);
5964 return elf_link_add_archive_symbols (abfd
, info
);
5966 bfd_set_error (bfd_error_wrong_format
);
5971 struct hash_codes_info
5973 unsigned long *hashcodes
;
5977 /* This function will be called though elf_link_hash_traverse to store
5978 all hash value of the exported symbols in an array. */
5981 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5983 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5988 /* Ignore indirect symbols. These are added by the versioning code. */
5989 if (h
->dynindx
== -1)
5992 name
= h
->root
.root
.string
;
5993 if (h
->versioned
>= versioned
)
5995 char *p
= strchr (name
, ELF_VER_CHR
);
5998 alc
= (char *) bfd_malloc (p
- name
+ 1);
6004 memcpy (alc
, name
, p
- name
);
6005 alc
[p
- name
] = '\0';
6010 /* Compute the hash value. */
6011 ha
= bfd_elf_hash (name
);
6013 /* Store the found hash value in the array given as the argument. */
6014 *(inf
->hashcodes
)++ = ha
;
6016 /* And store it in the struct so that we can put it in the hash table
6018 h
->u
.elf_hash_value
= ha
;
6024 struct collect_gnu_hash_codes
6027 const struct elf_backend_data
*bed
;
6028 unsigned long int nsyms
;
6029 unsigned long int maskbits
;
6030 unsigned long int *hashcodes
;
6031 unsigned long int *hashval
;
6032 unsigned long int *indx
;
6033 unsigned long int *counts
;
6037 long int min_dynindx
;
6038 unsigned long int bucketcount
;
6039 unsigned long int symindx
;
6040 long int local_indx
;
6041 long int shift1
, shift2
;
6042 unsigned long int mask
;
6046 /* This function will be called though elf_link_hash_traverse to store
6047 all hash value of the exported symbols in an array. */
6050 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6052 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6057 /* Ignore indirect symbols. These are added by the versioning code. */
6058 if (h
->dynindx
== -1)
6061 /* Ignore also local symbols and undefined symbols. */
6062 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6065 name
= h
->root
.root
.string
;
6066 if (h
->versioned
>= versioned
)
6068 char *p
= strchr (name
, ELF_VER_CHR
);
6071 alc
= (char *) bfd_malloc (p
- name
+ 1);
6077 memcpy (alc
, name
, p
- name
);
6078 alc
[p
- name
] = '\0';
6083 /* Compute the hash value. */
6084 ha
= bfd_elf_gnu_hash (name
);
6086 /* Store the found hash value in the array for compute_bucket_count,
6087 and also for .dynsym reordering purposes. */
6088 s
->hashcodes
[s
->nsyms
] = ha
;
6089 s
->hashval
[h
->dynindx
] = ha
;
6091 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6092 s
->min_dynindx
= h
->dynindx
;
6098 /* This function will be called though elf_link_hash_traverse to do
6099 final dynamic symbol renumbering in case of .gnu.hash.
6100 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6101 to the translation table. */
6104 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6106 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6107 unsigned long int bucket
;
6108 unsigned long int val
;
6110 /* Ignore indirect symbols. */
6111 if (h
->dynindx
== -1)
6114 /* Ignore also local symbols and undefined symbols. */
6115 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6117 if (h
->dynindx
>= s
->min_dynindx
)
6119 if (s
->bed
->record_xhash_symbol
!= NULL
)
6121 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6125 h
->dynindx
= s
->local_indx
++;
6130 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6131 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6132 & ((s
->maskbits
>> s
->shift1
) - 1);
6133 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6135 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6136 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6137 if (s
->counts
[bucket
] == 1)
6138 /* Last element terminates the chain. */
6140 bfd_put_32 (s
->output_bfd
, val
,
6141 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6142 --s
->counts
[bucket
];
6143 if (s
->bed
->record_xhash_symbol
!= NULL
)
6145 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6147 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6150 h
->dynindx
= s
->indx
[bucket
]++;
6154 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6157 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6159 return !(h
->forced_local
6160 || h
->root
.type
== bfd_link_hash_undefined
6161 || h
->root
.type
== bfd_link_hash_undefweak
6162 || ((h
->root
.type
== bfd_link_hash_defined
6163 || h
->root
.type
== bfd_link_hash_defweak
)
6164 && h
->root
.u
.def
.section
->output_section
== NULL
));
6167 /* Array used to determine the number of hash table buckets to use
6168 based on the number of symbols there are. If there are fewer than
6169 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6170 fewer than 37 we use 17 buckets, and so forth. We never use more
6171 than 32771 buckets. */
6173 static const size_t elf_buckets
[] =
6175 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6179 /* Compute bucket count for hashing table. We do not use a static set
6180 of possible tables sizes anymore. Instead we determine for all
6181 possible reasonable sizes of the table the outcome (i.e., the
6182 number of collisions etc) and choose the best solution. The
6183 weighting functions are not too simple to allow the table to grow
6184 without bounds. Instead one of the weighting factors is the size.
6185 Therefore the result is always a good payoff between few collisions
6186 (= short chain lengths) and table size. */
6188 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6189 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6190 unsigned long int nsyms
,
6193 size_t best_size
= 0;
6194 unsigned long int i
;
6196 /* We have a problem here. The following code to optimize the table
6197 size requires an integer type with more the 32 bits. If
6198 BFD_HOST_U_64_BIT is set we know about such a type. */
6199 #ifdef BFD_HOST_U_64_BIT
6204 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6205 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6206 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6207 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6208 unsigned long int *counts
;
6210 unsigned int no_improvement_count
= 0;
6212 /* Possible optimization parameters: if we have NSYMS symbols we say
6213 that the hashing table must at least have NSYMS/4 and at most
6215 minsize
= nsyms
/ 4;
6218 best_size
= maxsize
= nsyms
* 2;
6223 if ((best_size
& 31) == 0)
6227 /* Create array where we count the collisions in. We must use bfd_malloc
6228 since the size could be large. */
6230 amt
*= sizeof (unsigned long int);
6231 counts
= (unsigned long int *) bfd_malloc (amt
);
6235 /* Compute the "optimal" size for the hash table. The criteria is a
6236 minimal chain length. The minor criteria is (of course) the size
6238 for (i
= minsize
; i
< maxsize
; ++i
)
6240 /* Walk through the array of hashcodes and count the collisions. */
6241 BFD_HOST_U_64_BIT max
;
6242 unsigned long int j
;
6243 unsigned long int fact
;
6245 if (gnu_hash
&& (i
& 31) == 0)
6248 memset (counts
, '\0', i
* sizeof (unsigned long int));
6250 /* Determine how often each hash bucket is used. */
6251 for (j
= 0; j
< nsyms
; ++j
)
6252 ++counts
[hashcodes
[j
] % i
];
6254 /* For the weight function we need some information about the
6255 pagesize on the target. This is information need not be 100%
6256 accurate. Since this information is not available (so far) we
6257 define it here to a reasonable default value. If it is crucial
6258 to have a better value some day simply define this value. */
6259 # ifndef BFD_TARGET_PAGESIZE
6260 # define BFD_TARGET_PAGESIZE (4096)
6263 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6265 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6268 /* Variant 1: optimize for short chains. We add the squares
6269 of all the chain lengths (which favors many small chain
6270 over a few long chains). */
6271 for (j
= 0; j
< i
; ++j
)
6272 max
+= counts
[j
] * counts
[j
];
6274 /* This adds penalties for the overall size of the table. */
6275 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6278 /* Variant 2: Optimize a lot more for small table. Here we
6279 also add squares of the size but we also add penalties for
6280 empty slots (the +1 term). */
6281 for (j
= 0; j
< i
; ++j
)
6282 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6284 /* The overall size of the table is considered, but not as
6285 strong as in variant 1, where it is squared. */
6286 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6290 /* Compare with current best results. */
6291 if (max
< best_chlen
)
6295 no_improvement_count
= 0;
6297 /* PR 11843: Avoid futile long searches for the best bucket size
6298 when there are a large number of symbols. */
6299 else if (++no_improvement_count
== 100)
6306 #endif /* defined (BFD_HOST_U_64_BIT) */
6308 /* This is the fallback solution if no 64bit type is available or if we
6309 are not supposed to spend much time on optimizations. We select the
6310 bucket count using a fixed set of numbers. */
6311 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6313 best_size
= elf_buckets
[i
];
6314 if (nsyms
< elf_buckets
[i
+ 1])
6317 if (gnu_hash
&& best_size
< 2)
6324 /* Size any SHT_GROUP section for ld -r. */
6327 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6332 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6333 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6334 && (s
= ibfd
->sections
) != NULL
6335 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6336 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6341 /* Set a default stack segment size. The value in INFO wins. If it
6342 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6343 undefined it is initialized. */
6346 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6347 struct bfd_link_info
*info
,
6348 const char *legacy_symbol
,
6349 bfd_vma default_size
)
6351 struct elf_link_hash_entry
*h
= NULL
;
6353 /* Look for legacy symbol. */
6355 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6356 FALSE
, FALSE
, FALSE
);
6357 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6358 || h
->root
.type
== bfd_link_hash_defweak
)
6360 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6362 /* The symbol has no type if specified on the command line. */
6363 h
->type
= STT_OBJECT
;
6364 if (info
->stacksize
)
6365 /* xgettext:c-format */
6366 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6367 output_bfd
, legacy_symbol
);
6368 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6369 /* xgettext:c-format */
6370 _bfd_error_handler (_("%pB: %s not absolute"),
6371 output_bfd
, legacy_symbol
);
6373 info
->stacksize
= h
->root
.u
.def
.value
;
6376 if (!info
->stacksize
)
6377 /* If the user didn't set a size, or explicitly inhibit the
6378 size, set it now. */
6379 info
->stacksize
= default_size
;
6381 /* Provide the legacy symbol, if it is referenced. */
6382 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6383 || h
->root
.type
== bfd_link_hash_undefweak
))
6385 struct bfd_link_hash_entry
*bh
= NULL
;
6387 if (!(_bfd_generic_link_add_one_symbol
6388 (info
, output_bfd
, legacy_symbol
,
6389 BSF_GLOBAL
, bfd_abs_section_ptr
,
6390 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6391 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6394 h
= (struct elf_link_hash_entry
*) bh
;
6396 h
->type
= STT_OBJECT
;
6402 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6404 struct elf_gc_sweep_symbol_info
6406 struct bfd_link_info
*info
;
6407 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6412 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6415 && (((h
->root
.type
== bfd_link_hash_defined
6416 || h
->root
.type
== bfd_link_hash_defweak
)
6417 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6418 && h
->root
.u
.def
.section
->gc_mark
))
6419 || h
->root
.type
== bfd_link_hash_undefined
6420 || h
->root
.type
== bfd_link_hash_undefweak
))
6422 struct elf_gc_sweep_symbol_info
*inf
;
6424 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6425 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
6428 h
->ref_regular_nonweak
= 0;
6434 /* Set up the sizes and contents of the ELF dynamic sections. This is
6435 called by the ELF linker emulation before_allocation routine. We
6436 must set the sizes of the sections before the linker sets the
6437 addresses of the various sections. */
6440 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6443 const char *filter_shlib
,
6445 const char *depaudit
,
6446 const char * const *auxiliary_filters
,
6447 struct bfd_link_info
*info
,
6448 asection
**sinterpptr
)
6451 const struct elf_backend_data
*bed
;
6455 if (!is_elf_hash_table (info
->hash
))
6458 dynobj
= elf_hash_table (info
)->dynobj
;
6460 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6462 struct bfd_elf_version_tree
*verdefs
;
6463 struct elf_info_failed asvinfo
;
6464 struct bfd_elf_version_tree
*t
;
6465 struct bfd_elf_version_expr
*d
;
6469 /* If we are supposed to export all symbols into the dynamic symbol
6470 table (this is not the normal case), then do so. */
6471 if (info
->export_dynamic
6472 || (bfd_link_executable (info
) && info
->dynamic
))
6474 struct elf_info_failed eif
;
6478 elf_link_hash_traverse (elf_hash_table (info
),
6479 _bfd_elf_export_symbol
,
6487 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6489 if (soname_indx
== (size_t) -1
6490 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6494 soname_indx
= (size_t) -1;
6496 /* Make all global versions with definition. */
6497 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6498 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6499 if (!d
->symver
&& d
->literal
)
6501 const char *verstr
, *name
;
6502 size_t namelen
, verlen
, newlen
;
6503 char *newname
, *p
, leading_char
;
6504 struct elf_link_hash_entry
*newh
;
6506 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6508 namelen
= strlen (name
) + (leading_char
!= '\0');
6510 verlen
= strlen (verstr
);
6511 newlen
= namelen
+ verlen
+ 3;
6513 newname
= (char *) bfd_malloc (newlen
);
6514 if (newname
== NULL
)
6516 newname
[0] = leading_char
;
6517 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6519 /* Check the hidden versioned definition. */
6520 p
= newname
+ namelen
;
6522 memcpy (p
, verstr
, verlen
+ 1);
6523 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6524 newname
, FALSE
, FALSE
,
6527 || (newh
->root
.type
!= bfd_link_hash_defined
6528 && newh
->root
.type
!= bfd_link_hash_defweak
))
6530 /* Check the default versioned definition. */
6532 memcpy (p
, verstr
, verlen
+ 1);
6533 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6534 newname
, FALSE
, FALSE
,
6539 /* Mark this version if there is a definition and it is
6540 not defined in a shared object. */
6542 && !newh
->def_dynamic
6543 && (newh
->root
.type
== bfd_link_hash_defined
6544 || newh
->root
.type
== bfd_link_hash_defweak
))
6548 /* Attach all the symbols to their version information. */
6549 asvinfo
.info
= info
;
6550 asvinfo
.failed
= FALSE
;
6552 elf_link_hash_traverse (elf_hash_table (info
),
6553 _bfd_elf_link_assign_sym_version
,
6558 if (!info
->allow_undefined_version
)
6560 /* Check if all global versions have a definition. */
6561 bfd_boolean all_defined
= TRUE
;
6562 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6563 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6564 if (d
->literal
&& !d
->symver
&& !d
->script
)
6567 (_("%s: undefined version: %s"),
6568 d
->pattern
, t
->name
);
6569 all_defined
= FALSE
;
6574 bfd_set_error (bfd_error_bad_value
);
6579 /* Set up the version definition section. */
6580 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6581 BFD_ASSERT (s
!= NULL
);
6583 /* We may have created additional version definitions if we are
6584 just linking a regular application. */
6585 verdefs
= info
->version_info
;
6587 /* Skip anonymous version tag. */
6588 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6589 verdefs
= verdefs
->next
;
6591 if (verdefs
== NULL
&& !info
->create_default_symver
)
6592 s
->flags
|= SEC_EXCLUDE
;
6598 Elf_Internal_Verdef def
;
6599 Elf_Internal_Verdaux defaux
;
6600 struct bfd_link_hash_entry
*bh
;
6601 struct elf_link_hash_entry
*h
;
6607 /* Make space for the base version. */
6608 size
+= sizeof (Elf_External_Verdef
);
6609 size
+= sizeof (Elf_External_Verdaux
);
6612 /* Make space for the default version. */
6613 if (info
->create_default_symver
)
6615 size
+= sizeof (Elf_External_Verdef
);
6619 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6621 struct bfd_elf_version_deps
*n
;
6623 /* Don't emit base version twice. */
6627 size
+= sizeof (Elf_External_Verdef
);
6628 size
+= sizeof (Elf_External_Verdaux
);
6631 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6632 size
+= sizeof (Elf_External_Verdaux
);
6636 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6637 if (s
->contents
== NULL
&& s
->size
!= 0)
6640 /* Fill in the version definition section. */
6644 def
.vd_version
= VER_DEF_CURRENT
;
6645 def
.vd_flags
= VER_FLG_BASE
;
6648 if (info
->create_default_symver
)
6650 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6651 def
.vd_next
= sizeof (Elf_External_Verdef
);
6655 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6656 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6657 + sizeof (Elf_External_Verdaux
));
6660 if (soname_indx
!= (size_t) -1)
6662 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6664 def
.vd_hash
= bfd_elf_hash (soname
);
6665 defaux
.vda_name
= soname_indx
;
6672 name
= lbasename (bfd_get_filename (output_bfd
));
6673 def
.vd_hash
= bfd_elf_hash (name
);
6674 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6676 if (indx
== (size_t) -1)
6678 defaux
.vda_name
= indx
;
6680 defaux
.vda_next
= 0;
6682 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6683 (Elf_External_Verdef
*) p
);
6684 p
+= sizeof (Elf_External_Verdef
);
6685 if (info
->create_default_symver
)
6687 /* Add a symbol representing this version. */
6689 if (! (_bfd_generic_link_add_one_symbol
6690 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6692 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6694 h
= (struct elf_link_hash_entry
*) bh
;
6697 h
->type
= STT_OBJECT
;
6698 h
->verinfo
.vertree
= NULL
;
6700 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6703 /* Create a duplicate of the base version with the same
6704 aux block, but different flags. */
6707 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6709 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6710 + sizeof (Elf_External_Verdaux
));
6713 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6714 (Elf_External_Verdef
*) p
);
6715 p
+= sizeof (Elf_External_Verdef
);
6717 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6718 (Elf_External_Verdaux
*) p
);
6719 p
+= sizeof (Elf_External_Verdaux
);
6721 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6724 struct bfd_elf_version_deps
*n
;
6726 /* Don't emit the base version twice. */
6731 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6734 /* Add a symbol representing this version. */
6736 if (! (_bfd_generic_link_add_one_symbol
6737 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6739 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6741 h
= (struct elf_link_hash_entry
*) bh
;
6744 h
->type
= STT_OBJECT
;
6745 h
->verinfo
.vertree
= t
;
6747 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6750 def
.vd_version
= VER_DEF_CURRENT
;
6752 if (t
->globals
.list
== NULL
6753 && t
->locals
.list
== NULL
6755 def
.vd_flags
|= VER_FLG_WEAK
;
6756 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6757 def
.vd_cnt
= cdeps
+ 1;
6758 def
.vd_hash
= bfd_elf_hash (t
->name
);
6759 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6762 /* If a basever node is next, it *must* be the last node in
6763 the chain, otherwise Verdef construction breaks. */
6764 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6765 BFD_ASSERT (t
->next
->next
== NULL
);
6767 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6768 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6769 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6771 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6772 (Elf_External_Verdef
*) p
);
6773 p
+= sizeof (Elf_External_Verdef
);
6775 defaux
.vda_name
= h
->dynstr_index
;
6776 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6778 defaux
.vda_next
= 0;
6779 if (t
->deps
!= NULL
)
6780 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6781 t
->name_indx
= defaux
.vda_name
;
6783 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6784 (Elf_External_Verdaux
*) p
);
6785 p
+= sizeof (Elf_External_Verdaux
);
6787 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6789 if (n
->version_needed
== NULL
)
6791 /* This can happen if there was an error in the
6793 defaux
.vda_name
= 0;
6797 defaux
.vda_name
= n
->version_needed
->name_indx
;
6798 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6801 if (n
->next
== NULL
)
6802 defaux
.vda_next
= 0;
6804 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6806 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6807 (Elf_External_Verdaux
*) p
);
6808 p
+= sizeof (Elf_External_Verdaux
);
6812 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6816 bed
= get_elf_backend_data (output_bfd
);
6818 if (info
->gc_sections
&& bed
->can_gc_sections
)
6820 struct elf_gc_sweep_symbol_info sweep_info
;
6822 /* Remove the symbols that were in the swept sections from the
6823 dynamic symbol table. */
6824 sweep_info
.info
= info
;
6825 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6826 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6830 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6833 struct elf_find_verdep_info sinfo
;
6835 /* Work out the size of the version reference section. */
6837 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6838 BFD_ASSERT (s
!= NULL
);
6841 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6842 if (sinfo
.vers
== 0)
6844 sinfo
.failed
= FALSE
;
6846 elf_link_hash_traverse (elf_hash_table (info
),
6847 _bfd_elf_link_find_version_dependencies
,
6852 if (elf_tdata (output_bfd
)->verref
== NULL
)
6853 s
->flags
|= SEC_EXCLUDE
;
6856 Elf_Internal_Verneed
*vn
;
6861 /* Build the version dependency section. */
6864 for (vn
= elf_tdata (output_bfd
)->verref
;
6866 vn
= vn
->vn_nextref
)
6868 Elf_Internal_Vernaux
*a
;
6870 size
+= sizeof (Elf_External_Verneed
);
6872 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6873 size
+= sizeof (Elf_External_Vernaux
);
6877 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6878 if (s
->contents
== NULL
)
6882 for (vn
= elf_tdata (output_bfd
)->verref
;
6884 vn
= vn
->vn_nextref
)
6887 Elf_Internal_Vernaux
*a
;
6891 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6894 vn
->vn_version
= VER_NEED_CURRENT
;
6896 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6897 elf_dt_name (vn
->vn_bfd
) != NULL
6898 ? elf_dt_name (vn
->vn_bfd
)
6899 : lbasename (bfd_get_filename
6902 if (indx
== (size_t) -1)
6905 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6906 if (vn
->vn_nextref
== NULL
)
6909 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6910 + caux
* sizeof (Elf_External_Vernaux
));
6912 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6913 (Elf_External_Verneed
*) p
);
6914 p
+= sizeof (Elf_External_Verneed
);
6916 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6918 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6919 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6920 a
->vna_nodename
, FALSE
);
6921 if (indx
== (size_t) -1)
6924 if (a
->vna_nextptr
== NULL
)
6927 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6929 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6930 (Elf_External_Vernaux
*) p
);
6931 p
+= sizeof (Elf_External_Vernaux
);
6935 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6939 /* Any syms created from now on start with -1 in
6940 got.refcount/offset and plt.refcount/offset. */
6941 elf_hash_table (info
)->init_got_refcount
6942 = elf_hash_table (info
)->init_got_offset
;
6943 elf_hash_table (info
)->init_plt_refcount
6944 = elf_hash_table (info
)->init_plt_offset
;
6946 if (bfd_link_relocatable (info
)
6947 && !_bfd_elf_size_group_sections (info
))
6950 /* The backend may have to create some sections regardless of whether
6951 we're dynamic or not. */
6952 if (bed
->elf_backend_always_size_sections
6953 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6956 /* Determine any GNU_STACK segment requirements, after the backend
6957 has had a chance to set a default segment size. */
6958 if (info
->execstack
)
6959 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6960 else if (info
->noexecstack
)
6961 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6965 asection
*notesec
= NULL
;
6968 for (inputobj
= info
->input_bfds
;
6970 inputobj
= inputobj
->link
.next
)
6975 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6977 s
= inputobj
->sections
;
6978 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6981 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6984 if (s
->flags
& SEC_CODE
)
6988 else if (bed
->default_execstack
)
6991 if (notesec
|| info
->stacksize
> 0)
6992 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
6993 if (notesec
&& exec
&& bfd_link_relocatable (info
)
6994 && notesec
->output_section
!= bfd_abs_section_ptr
)
6995 notesec
->output_section
->flags
|= SEC_CODE
;
6998 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7000 struct elf_info_failed eif
;
7001 struct elf_link_hash_entry
*h
;
7005 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
7006 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
7010 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
7012 info
->flags
|= DF_SYMBOLIC
;
7020 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
7022 if (indx
== (size_t) -1)
7025 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
7026 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
7030 if (filter_shlib
!= NULL
)
7034 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7035 filter_shlib
, TRUE
);
7036 if (indx
== (size_t) -1
7037 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
7041 if (auxiliary_filters
!= NULL
)
7043 const char * const *p
;
7045 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
7049 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7051 if (indx
== (size_t) -1
7052 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7061 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7063 if (indx
== (size_t) -1
7064 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7068 if (depaudit
!= NULL
)
7072 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7074 if (indx
== (size_t) -1
7075 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7082 /* Find all symbols which were defined in a dynamic object and make
7083 the backend pick a reasonable value for them. */
7084 elf_link_hash_traverse (elf_hash_table (info
),
7085 _bfd_elf_adjust_dynamic_symbol
,
7090 /* Add some entries to the .dynamic section. We fill in some of the
7091 values later, in bfd_elf_final_link, but we must add the entries
7092 now so that we know the final size of the .dynamic section. */
7094 /* If there are initialization and/or finalization functions to
7095 call then add the corresponding DT_INIT/DT_FINI entries. */
7096 h
= (info
->init_function
7097 ? elf_link_hash_lookup (elf_hash_table (info
),
7098 info
->init_function
, FALSE
,
7105 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7108 h
= (info
->fini_function
7109 ? elf_link_hash_lookup (elf_hash_table (info
),
7110 info
->fini_function
, FALSE
,
7117 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7121 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7122 if (s
!= NULL
&& s
->linker_has_input
)
7124 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7125 if (! bfd_link_executable (info
))
7130 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7131 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7132 && (o
= sub
->sections
) != NULL
7133 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7134 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7135 if (elf_section_data (o
)->this_hdr
.sh_type
7136 == SHT_PREINIT_ARRAY
)
7139 (_("%pB: .preinit_array section is not allowed in DSO"),
7144 bfd_set_error (bfd_error_nonrepresentable_section
);
7148 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7149 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7152 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7153 if (s
!= NULL
&& s
->linker_has_input
)
7155 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7156 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7159 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7160 if (s
!= NULL
&& s
->linker_has_input
)
7162 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7163 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7167 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7168 /* If .dynstr is excluded from the link, we don't want any of
7169 these tags. Strictly, we should be checking each section
7170 individually; This quick check covers for the case where
7171 someone does a /DISCARD/ : { *(*) }. */
7172 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7174 bfd_size_type strsize
;
7176 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7177 if ((info
->emit_hash
7178 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7179 || (info
->emit_gnu_hash
7180 && (bed
->record_xhash_symbol
== NULL
7181 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7182 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7183 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7184 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7185 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7187 || (info
->gnu_flags_1
7188 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_FLAGS_1
,
7189 info
->gnu_flags_1
)))
7194 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7197 /* The backend must work out the sizes of all the other dynamic
7200 && bed
->elf_backend_size_dynamic_sections
!= NULL
7201 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7204 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7206 if (elf_tdata (output_bfd
)->cverdefs
)
7208 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7210 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7211 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7215 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7217 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7220 else if (info
->flags
& DF_BIND_NOW
)
7222 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7228 if (bfd_link_executable (info
))
7229 info
->flags_1
&= ~ (DF_1_INITFIRST
7232 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7236 if (elf_tdata (output_bfd
)->cverrefs
)
7238 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7240 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7241 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7245 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7246 && elf_tdata (output_bfd
)->cverdefs
== 0)
7247 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7251 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7252 s
->flags
|= SEC_EXCLUDE
;
7258 /* Find the first non-excluded output section. We'll use its
7259 section symbol for some emitted relocs. */
7261 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7264 asection
*found
= NULL
;
7266 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7267 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7268 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7271 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7274 elf_hash_table (info
)->text_index_section
= found
;
7277 /* Find two non-excluded output sections, one for code, one for data.
7278 We'll use their section symbols for some emitted relocs. */
7280 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7283 asection
*found
= NULL
;
7285 /* Data first, since setting text_index_section changes
7286 _bfd_elf_omit_section_dynsym_default. */
7287 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7288 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7289 && !(s
->flags
& SEC_READONLY
)
7290 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7293 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7296 elf_hash_table (info
)->data_index_section
= found
;
7298 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7299 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7300 && (s
->flags
& SEC_READONLY
)
7301 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7306 elf_hash_table (info
)->text_index_section
= found
;
7309 #define GNU_HASH_SECTION_NAME(bed) \
7310 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7313 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7315 const struct elf_backend_data
*bed
;
7316 unsigned long section_sym_count
;
7317 bfd_size_type dynsymcount
= 0;
7319 if (!is_elf_hash_table (info
->hash
))
7322 bed
= get_elf_backend_data (output_bfd
);
7323 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7325 /* Assign dynsym indices. In a shared library we generate a section
7326 symbol for each output section, which come first. Next come all
7327 of the back-end allocated local dynamic syms, followed by the rest
7328 of the global symbols.
7330 This is usually not needed for static binaries, however backends
7331 can request to always do it, e.g. the MIPS backend uses dynamic
7332 symbol counts to lay out GOT, which will be produced in the
7333 presence of GOT relocations even in static binaries (holding fixed
7334 data in that case, to satisfy those relocations). */
7336 if (elf_hash_table (info
)->dynamic_sections_created
7337 || bed
->always_renumber_dynsyms
)
7338 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7339 §ion_sym_count
);
7341 if (elf_hash_table (info
)->dynamic_sections_created
)
7345 unsigned int dtagcount
;
7347 dynobj
= elf_hash_table (info
)->dynobj
;
7349 /* Work out the size of the symbol version section. */
7350 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7351 BFD_ASSERT (s
!= NULL
);
7352 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7354 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7355 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7356 if (s
->contents
== NULL
)
7359 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7363 /* Set the size of the .dynsym and .hash sections. We counted
7364 the number of dynamic symbols in elf_link_add_object_symbols.
7365 We will build the contents of .dynsym and .hash when we build
7366 the final symbol table, because until then we do not know the
7367 correct value to give the symbols. We built the .dynstr
7368 section as we went along in elf_link_add_object_symbols. */
7369 s
= elf_hash_table (info
)->dynsym
;
7370 BFD_ASSERT (s
!= NULL
);
7371 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7373 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7374 if (s
->contents
== NULL
)
7377 /* The first entry in .dynsym is a dummy symbol. Clear all the
7378 section syms, in case we don't output them all. */
7379 ++section_sym_count
;
7380 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7382 elf_hash_table (info
)->bucketcount
= 0;
7384 /* Compute the size of the hashing table. As a side effect this
7385 computes the hash values for all the names we export. */
7386 if (info
->emit_hash
)
7388 unsigned long int *hashcodes
;
7389 struct hash_codes_info hashinf
;
7391 unsigned long int nsyms
;
7393 size_t hash_entry_size
;
7395 /* Compute the hash values for all exported symbols. At the same
7396 time store the values in an array so that we could use them for
7398 amt
= dynsymcount
* sizeof (unsigned long int);
7399 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7400 if (hashcodes
== NULL
)
7402 hashinf
.hashcodes
= hashcodes
;
7403 hashinf
.error
= FALSE
;
7405 /* Put all hash values in HASHCODES. */
7406 elf_link_hash_traverse (elf_hash_table (info
),
7407 elf_collect_hash_codes
, &hashinf
);
7414 nsyms
= hashinf
.hashcodes
- hashcodes
;
7416 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7419 if (bucketcount
== 0 && nsyms
> 0)
7422 elf_hash_table (info
)->bucketcount
= bucketcount
;
7424 s
= bfd_get_linker_section (dynobj
, ".hash");
7425 BFD_ASSERT (s
!= NULL
);
7426 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7427 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7428 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7429 if (s
->contents
== NULL
)
7432 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7433 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7434 s
->contents
+ hash_entry_size
);
7437 if (info
->emit_gnu_hash
)
7440 unsigned char *contents
;
7441 struct collect_gnu_hash_codes cinfo
;
7445 memset (&cinfo
, 0, sizeof (cinfo
));
7447 /* Compute the hash values for all exported symbols. At the same
7448 time store the values in an array so that we could use them for
7450 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7451 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7452 if (cinfo
.hashcodes
== NULL
)
7455 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7456 cinfo
.min_dynindx
= -1;
7457 cinfo
.output_bfd
= output_bfd
;
7460 /* Put all hash values in HASHCODES. */
7461 elf_link_hash_traverse (elf_hash_table (info
),
7462 elf_collect_gnu_hash_codes
, &cinfo
);
7465 free (cinfo
.hashcodes
);
7470 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7472 if (bucketcount
== 0)
7474 free (cinfo
.hashcodes
);
7478 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7479 BFD_ASSERT (s
!= NULL
);
7481 if (cinfo
.nsyms
== 0)
7483 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7484 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7485 free (cinfo
.hashcodes
);
7486 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7487 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7488 if (contents
== NULL
)
7490 s
->contents
= contents
;
7491 /* 1 empty bucket. */
7492 bfd_put_32 (output_bfd
, 1, contents
);
7493 /* SYMIDX above the special symbol 0. */
7494 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7495 /* Just one word for bitmask. */
7496 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7497 /* Only hash fn bloom filter. */
7498 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7499 /* No hashes are valid - empty bitmask. */
7500 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7501 /* No hashes in the only bucket. */
7502 bfd_put_32 (output_bfd
, 0,
7503 contents
+ 16 + bed
->s
->arch_size
/ 8);
7507 unsigned long int maskwords
, maskbitslog2
, x
;
7508 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7512 while ((x
>>= 1) != 0)
7514 if (maskbitslog2
< 3)
7516 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7517 maskbitslog2
= maskbitslog2
+ 3;
7519 maskbitslog2
= maskbitslog2
+ 2;
7520 if (bed
->s
->arch_size
== 64)
7522 if (maskbitslog2
== 5)
7528 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7529 cinfo
.shift2
= maskbitslog2
;
7530 cinfo
.maskbits
= 1 << maskbitslog2
;
7531 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7532 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7533 amt
+= maskwords
* sizeof (bfd_vma
);
7534 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7535 if (cinfo
.bitmask
== NULL
)
7537 free (cinfo
.hashcodes
);
7541 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7542 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7543 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7544 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7546 /* Determine how often each hash bucket is used. */
7547 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7548 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7549 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7551 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7552 if (cinfo
.counts
[i
] != 0)
7554 cinfo
.indx
[i
] = cnt
;
7555 cnt
+= cinfo
.counts
[i
];
7557 BFD_ASSERT (cnt
== dynsymcount
);
7558 cinfo
.bucketcount
= bucketcount
;
7559 cinfo
.local_indx
= cinfo
.min_dynindx
;
7561 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7562 s
->size
+= cinfo
.maskbits
/ 8;
7563 if (bed
->record_xhash_symbol
!= NULL
)
7564 s
->size
+= cinfo
.nsyms
* 4;
7565 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7566 if (contents
== NULL
)
7568 free (cinfo
.bitmask
);
7569 free (cinfo
.hashcodes
);
7573 s
->contents
= contents
;
7574 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7575 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7576 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7577 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7578 contents
+= 16 + cinfo
.maskbits
/ 8;
7580 for (i
= 0; i
< bucketcount
; ++i
)
7582 if (cinfo
.counts
[i
] == 0)
7583 bfd_put_32 (output_bfd
, 0, contents
);
7585 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7589 cinfo
.contents
= contents
;
7591 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7592 /* Renumber dynamic symbols, if populating .gnu.hash section.
7593 If using .MIPS.xhash, populate the translation table. */
7594 elf_link_hash_traverse (elf_hash_table (info
),
7595 elf_gnu_hash_process_symidx
, &cinfo
);
7597 contents
= s
->contents
+ 16;
7598 for (i
= 0; i
< maskwords
; ++i
)
7600 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7602 contents
+= bed
->s
->arch_size
/ 8;
7605 free (cinfo
.bitmask
);
7606 free (cinfo
.hashcodes
);
7610 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7611 BFD_ASSERT (s
!= NULL
);
7613 elf_finalize_dynstr (output_bfd
, info
);
7615 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7617 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7618 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7625 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7628 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7631 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7632 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7635 /* Finish SHF_MERGE section merging. */
7638 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7643 if (!is_elf_hash_table (info
->hash
))
7646 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7647 if ((ibfd
->flags
& DYNAMIC
) == 0
7648 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7649 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7650 == get_elf_backend_data (obfd
)->s
->elfclass
))
7651 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7652 if ((sec
->flags
& SEC_MERGE
) != 0
7653 && !bfd_is_abs_section (sec
->output_section
))
7655 struct bfd_elf_section_data
*secdata
;
7657 secdata
= elf_section_data (sec
);
7658 if (! _bfd_add_merge_section (obfd
,
7659 &elf_hash_table (info
)->merge_info
,
7660 sec
, &secdata
->sec_info
))
7662 else if (secdata
->sec_info
)
7663 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7666 if (elf_hash_table (info
)->merge_info
!= NULL
)
7667 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7668 merge_sections_remove_hook
);
7672 /* Create an entry in an ELF linker hash table. */
7674 struct bfd_hash_entry
*
7675 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7676 struct bfd_hash_table
*table
,
7679 /* Allocate the structure if it has not already been allocated by a
7683 entry
= (struct bfd_hash_entry
*)
7684 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7689 /* Call the allocation method of the superclass. */
7690 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7693 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7694 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7696 /* Set local fields. */
7699 ret
->got
= htab
->init_got_refcount
;
7700 ret
->plt
= htab
->init_plt_refcount
;
7701 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7702 - offsetof (struct elf_link_hash_entry
, size
)));
7703 /* Assume that we have been called by a non-ELF symbol reader.
7704 This flag is then reset by the code which reads an ELF input
7705 file. This ensures that a symbol created by a non-ELF symbol
7706 reader will have the flag set correctly. */
7713 /* Copy data from an indirect symbol to its direct symbol, hiding the
7714 old indirect symbol. Also used for copying flags to a weakdef. */
7717 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7718 struct elf_link_hash_entry
*dir
,
7719 struct elf_link_hash_entry
*ind
)
7721 struct elf_link_hash_table
*htab
;
7723 if (ind
->dyn_relocs
!= NULL
)
7725 if (dir
->dyn_relocs
!= NULL
)
7727 struct elf_dyn_relocs
**pp
;
7728 struct elf_dyn_relocs
*p
;
7730 /* Add reloc counts against the indirect sym to the direct sym
7731 list. Merge any entries against the same section. */
7732 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7734 struct elf_dyn_relocs
*q
;
7736 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7737 if (q
->sec
== p
->sec
)
7739 q
->pc_count
+= p
->pc_count
;
7740 q
->count
+= p
->count
;
7747 *pp
= dir
->dyn_relocs
;
7750 dir
->dyn_relocs
= ind
->dyn_relocs
;
7751 ind
->dyn_relocs
= NULL
;
7754 /* Copy down any references that we may have already seen to the
7755 symbol which just became indirect. */
7757 if (dir
->versioned
!= versioned_hidden
)
7758 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7759 dir
->ref_regular
|= ind
->ref_regular
;
7760 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7761 dir
->non_got_ref
|= ind
->non_got_ref
;
7762 dir
->needs_plt
|= ind
->needs_plt
;
7763 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7765 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7768 /* Copy over the global and procedure linkage table refcount entries.
7769 These may have been already set up by a check_relocs routine. */
7770 htab
= elf_hash_table (info
);
7771 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7773 if (dir
->got
.refcount
< 0)
7774 dir
->got
.refcount
= 0;
7775 dir
->got
.refcount
+= ind
->got
.refcount
;
7776 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7779 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7781 if (dir
->plt
.refcount
< 0)
7782 dir
->plt
.refcount
= 0;
7783 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7784 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7787 if (ind
->dynindx
!= -1)
7789 if (dir
->dynindx
!= -1)
7790 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7791 dir
->dynindx
= ind
->dynindx
;
7792 dir
->dynstr_index
= ind
->dynstr_index
;
7794 ind
->dynstr_index
= 0;
7799 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7800 struct elf_link_hash_entry
*h
,
7801 bfd_boolean force_local
)
7803 /* STT_GNU_IFUNC symbol must go through PLT. */
7804 if (h
->type
!= STT_GNU_IFUNC
)
7806 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7811 h
->forced_local
= 1;
7812 if (h
->dynindx
!= -1)
7814 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7817 h
->dynstr_index
= 0;
7822 /* Hide a symbol. */
7825 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7826 struct bfd_link_info
*info
,
7827 struct bfd_link_hash_entry
*h
)
7829 if (is_elf_hash_table (info
->hash
))
7831 const struct elf_backend_data
*bed
7832 = get_elf_backend_data (output_bfd
);
7833 struct elf_link_hash_entry
*eh
7834 = (struct elf_link_hash_entry
*) h
;
7835 bed
->elf_backend_hide_symbol (info
, eh
, TRUE
);
7836 eh
->def_dynamic
= 0;
7837 eh
->ref_dynamic
= 0;
7838 eh
->dynamic_def
= 0;
7842 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7846 _bfd_elf_link_hash_table_init
7847 (struct elf_link_hash_table
*table
,
7849 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7850 struct bfd_hash_table
*,
7852 unsigned int entsize
,
7853 enum elf_target_id target_id
)
7856 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7858 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7859 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7860 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7861 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7862 /* The first dynamic symbol is a dummy. */
7863 table
->dynsymcount
= 1;
7865 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7867 table
->root
.type
= bfd_link_elf_hash_table
;
7868 table
->hash_table_id
= target_id
;
7869 table
->target_os
= get_elf_backend_data (abfd
)->target_os
;
7874 /* Create an ELF linker hash table. */
7876 struct bfd_link_hash_table
*
7877 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7879 struct elf_link_hash_table
*ret
;
7880 size_t amt
= sizeof (struct elf_link_hash_table
);
7882 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7886 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7887 sizeof (struct elf_link_hash_entry
),
7893 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7898 /* Destroy an ELF linker hash table. */
7901 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7903 struct elf_link_hash_table
*htab
;
7905 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7906 if (htab
->dynstr
!= NULL
)
7907 _bfd_elf_strtab_free (htab
->dynstr
);
7908 _bfd_merge_sections_free (htab
->merge_info
);
7909 _bfd_generic_link_hash_table_free (obfd
);
7912 /* This is a hook for the ELF emulation code in the generic linker to
7913 tell the backend linker what file name to use for the DT_NEEDED
7914 entry for a dynamic object. */
7917 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7919 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7920 && bfd_get_format (abfd
) == bfd_object
)
7921 elf_dt_name (abfd
) = name
;
7925 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7928 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7929 && bfd_get_format (abfd
) == bfd_object
)
7930 lib_class
= elf_dyn_lib_class (abfd
);
7937 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7939 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7940 && bfd_get_format (abfd
) == bfd_object
)
7941 elf_dyn_lib_class (abfd
) = lib_class
;
7944 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7945 the linker ELF emulation code. */
7947 struct bfd_link_needed_list
*
7948 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7949 struct bfd_link_info
*info
)
7951 if (! is_elf_hash_table (info
->hash
))
7953 return elf_hash_table (info
)->needed
;
7956 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7957 hook for the linker ELF emulation code. */
7959 struct bfd_link_needed_list
*
7960 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7961 struct bfd_link_info
*info
)
7963 if (! is_elf_hash_table (info
->hash
))
7965 return elf_hash_table (info
)->runpath
;
7968 /* Get the name actually used for a dynamic object for a link. This
7969 is the SONAME entry if there is one. Otherwise, it is the string
7970 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7973 bfd_elf_get_dt_soname (bfd
*abfd
)
7975 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7976 && bfd_get_format (abfd
) == bfd_object
)
7977 return elf_dt_name (abfd
);
7981 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7982 the ELF linker emulation code. */
7985 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7986 struct bfd_link_needed_list
**pneeded
)
7989 bfd_byte
*dynbuf
= NULL
;
7990 unsigned int elfsec
;
7991 unsigned long shlink
;
7992 bfd_byte
*extdyn
, *extdynend
;
7994 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
7998 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
7999 || bfd_get_format (abfd
) != bfd_object
)
8002 s
= bfd_get_section_by_name (abfd
, ".dynamic");
8003 if (s
== NULL
|| s
->size
== 0)
8006 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
8009 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
8010 if (elfsec
== SHN_BAD
)
8013 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
8015 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
8016 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
8019 extdynend
= extdyn
+ s
->size
;
8020 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
8022 Elf_Internal_Dyn dyn
;
8024 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
8026 if (dyn
.d_tag
== DT_NULL
)
8029 if (dyn
.d_tag
== DT_NEEDED
)
8032 struct bfd_link_needed_list
*l
;
8033 unsigned int tagv
= dyn
.d_un
.d_val
;
8036 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
8041 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
8061 struct elf_symbuf_symbol
8063 unsigned long st_name
; /* Symbol name, index in string tbl */
8064 unsigned char st_info
; /* Type and binding attributes */
8065 unsigned char st_other
; /* Visibilty, and target specific */
8068 struct elf_symbuf_head
8070 struct elf_symbuf_symbol
*ssym
;
8072 unsigned int st_shndx
;
8079 Elf_Internal_Sym
*isym
;
8080 struct elf_symbuf_symbol
*ssym
;
8086 /* Sort references to symbols by ascending section number. */
8089 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8091 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8092 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8094 if (s1
->st_shndx
!= s2
->st_shndx
)
8095 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8096 /* Final sort by the address of the sym in the symbuf ensures
8099 return s1
> s2
? 1 : -1;
8104 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8106 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8107 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8108 int ret
= strcmp (s1
->name
, s2
->name
);
8111 if (s1
->u
.p
!= s2
->u
.p
)
8112 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8116 static struct elf_symbuf_head
*
8117 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8119 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8120 struct elf_symbuf_symbol
*ssym
;
8121 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8122 size_t i
, shndx_count
, total_size
, amt
;
8124 amt
= symcount
* sizeof (*indbuf
);
8125 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8129 /* NB: When checking if 2 sections define the same set of local and
8130 global symbols, ignore both undefined and section symbols in the
8132 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8133 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
8134 && ELF_ST_TYPE (isymbuf
[i
].st_info
) != STT_SECTION
)
8135 *ind
++ = &isymbuf
[i
];
8138 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8139 elf_sort_elf_symbol
);
8142 if (indbufend
> indbuf
)
8143 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8144 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8147 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8148 + (indbufend
- indbuf
) * sizeof (*ssym
));
8149 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8150 if (ssymbuf
== NULL
)
8156 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8157 ssymbuf
->ssym
= NULL
;
8158 ssymbuf
->count
= shndx_count
;
8159 ssymbuf
->st_shndx
= 0;
8160 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8162 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8165 ssymhead
->ssym
= ssym
;
8166 ssymhead
->count
= 0;
8167 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8169 ssym
->st_name
= (*ind
)->st_name
;
8170 ssym
->st_info
= (*ind
)->st_info
;
8171 ssym
->st_other
= (*ind
)->st_other
;
8174 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8175 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
8182 /* Check if 2 sections define the same set of local and global
8186 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8187 struct bfd_link_info
*info
)
8190 const struct elf_backend_data
*bed1
, *bed2
;
8191 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8192 size_t symcount1
, symcount2
;
8193 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8194 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8195 Elf_Internal_Sym
*isym
, *isymend
;
8196 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8197 size_t count1
, count2
, i
;
8198 unsigned int shndx1
, shndx2
;
8204 /* Both sections have to be in ELF. */
8205 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8206 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8209 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8212 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8213 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8214 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8217 bed1
= get_elf_backend_data (bfd1
);
8218 bed2
= get_elf_backend_data (bfd2
);
8219 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8220 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8221 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8222 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8224 if (symcount1
== 0 || symcount2
== 0)
8230 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8231 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8233 if (ssymbuf1
== NULL
)
8235 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8237 if (isymbuf1
== NULL
)
8240 if (info
!= NULL
&& !info
->reduce_memory_overheads
)
8242 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8243 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8247 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8249 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8251 if (isymbuf2
== NULL
)
8254 if (ssymbuf1
!= NULL
&& info
!= NULL
&& !info
->reduce_memory_overheads
)
8256 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8257 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8261 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8263 /* Optimized faster version. */
8265 struct elf_symbol
*symp
;
8266 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8269 hi
= ssymbuf1
->count
;
8274 mid
= (lo
+ hi
) / 2;
8275 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8277 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8281 count1
= ssymbuf1
[mid
].count
;
8288 hi
= ssymbuf2
->count
;
8293 mid
= (lo
+ hi
) / 2;
8294 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8296 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8300 count2
= ssymbuf2
[mid
].count
;
8306 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8310 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8312 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8313 if (symtable1
== NULL
|| symtable2
== NULL
)
8317 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
8318 ssym
< ssymend
; ssym
++, symp
++)
8320 symp
->u
.ssym
= ssym
;
8321 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8327 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
8328 ssym
< ssymend
; ssym
++, symp
++)
8330 symp
->u
.ssym
= ssym
;
8331 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8336 /* Sort symbol by name. */
8337 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8338 elf_sym_name_compare
);
8339 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8340 elf_sym_name_compare
);
8342 for (i
= 0; i
< count1
; i
++)
8343 /* Two symbols must have the same binding, type and name. */
8344 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8345 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8346 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8353 symtable1
= (struct elf_symbol
*)
8354 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8355 symtable2
= (struct elf_symbol
*)
8356 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8357 if (symtable1
== NULL
|| symtable2
== NULL
)
8360 /* Count definitions in the section. */
8362 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8363 if (isym
->st_shndx
== shndx1
)
8364 symtable1
[count1
++].u
.isym
= isym
;
8367 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8368 if (isym
->st_shndx
== shndx2
)
8369 symtable2
[count2
++].u
.isym
= isym
;
8371 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8374 for (i
= 0; i
< count1
; i
++)
8376 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8377 symtable1
[i
].u
.isym
->st_name
);
8379 for (i
= 0; i
< count2
; i
++)
8381 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8382 symtable2
[i
].u
.isym
->st_name
);
8384 /* Sort symbol by name. */
8385 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8386 elf_sym_name_compare
);
8387 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8388 elf_sym_name_compare
);
8390 for (i
= 0; i
< count1
; i
++)
8391 /* Two symbols must have the same binding, type and name. */
8392 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8393 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8394 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8408 /* Return TRUE if 2 section types are compatible. */
8411 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8412 bfd
*bbfd
, const asection
*bsec
)
8416 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8417 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8420 return elf_section_type (asec
) == elf_section_type (bsec
);
8423 /* Final phase of ELF linker. */
8425 /* A structure we use to avoid passing large numbers of arguments. */
8427 struct elf_final_link_info
8429 /* General link information. */
8430 struct bfd_link_info
*info
;
8433 /* Symbol string table. */
8434 struct elf_strtab_hash
*symstrtab
;
8435 /* .hash section. */
8437 /* symbol version section (.gnu.version). */
8438 asection
*symver_sec
;
8439 /* Buffer large enough to hold contents of any section. */
8441 /* Buffer large enough to hold external relocs of any section. */
8442 void *external_relocs
;
8443 /* Buffer large enough to hold internal relocs of any section. */
8444 Elf_Internal_Rela
*internal_relocs
;
8445 /* Buffer large enough to hold external local symbols of any input
8447 bfd_byte
*external_syms
;
8448 /* And a buffer for symbol section indices. */
8449 Elf_External_Sym_Shndx
*locsym_shndx
;
8450 /* Buffer large enough to hold internal local symbols of any input
8452 Elf_Internal_Sym
*internal_syms
;
8453 /* Array large enough to hold a symbol index for each local symbol
8454 of any input BFD. */
8456 /* Array large enough to hold a section pointer for each local
8457 symbol of any input BFD. */
8458 asection
**sections
;
8459 /* Buffer for SHT_SYMTAB_SHNDX section. */
8460 Elf_External_Sym_Shndx
*symshndxbuf
;
8461 /* Number of STT_FILE syms seen. */
8462 size_t filesym_count
;
8463 /* Local symbol hash table. */
8464 struct bfd_hash_table local_hash_table
;
8467 struct local_hash_entry
8469 /* Base hash table entry structure. */
8470 struct bfd_hash_entry root
;
8471 /* Size of the local symbol name. */
8473 /* Number of the duplicated local symbol names. */
8477 /* Create an entry in the local symbol hash table. */
8479 static struct bfd_hash_entry
*
8480 local_hash_newfunc (struct bfd_hash_entry
*entry
,
8481 struct bfd_hash_table
*table
,
8485 /* Allocate the structure if it has not already been allocated by a
8489 entry
= bfd_hash_allocate (table
,
8490 sizeof (struct local_hash_entry
));
8495 /* Call the allocation method of the superclass. */
8496 entry
= bfd_hash_newfunc (entry
, table
, string
);
8499 ((struct local_hash_entry
*) entry
)->count
= 0;
8500 ((struct local_hash_entry
*) entry
)->size
= 0;
8506 /* This struct is used to pass information to elf_link_output_extsym. */
8508 struct elf_outext_info
8511 bfd_boolean localsyms
;
8512 bfd_boolean file_sym_done
;
8513 struct elf_final_link_info
*flinfo
;
8517 /* Support for evaluating a complex relocation.
8519 Complex relocations are generalized, self-describing relocations. The
8520 implementation of them consists of two parts: complex symbols, and the
8521 relocations themselves.
8523 The relocations use a reserved elf-wide relocation type code (R_RELC
8524 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8525 information (start bit, end bit, word width, etc) into the addend. This
8526 information is extracted from CGEN-generated operand tables within gas.
8528 Complex symbols are mangled symbols (STT_RELC external / BSF_RELC
8529 internal) representing prefix-notation expressions, including but not
8530 limited to those sorts of expressions normally encoded as addends in the
8531 addend field. The symbol mangling format is:
8534 | <unary-operator> ':' <node>
8535 | <binary-operator> ':' <node> ':' <node>
8538 <literal> := 's' <digits=N> ':' <N character symbol name>
8539 | 'S' <digits=N> ':' <N character section name>
8543 <binary-operator> := as in C
8544 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8547 set_symbol_value (bfd
*bfd_with_globals
,
8548 Elf_Internal_Sym
*isymbuf
,
8553 struct elf_link_hash_entry
**sym_hashes
;
8554 struct elf_link_hash_entry
*h
;
8555 size_t extsymoff
= locsymcount
;
8557 if (symidx
< locsymcount
)
8559 Elf_Internal_Sym
*sym
;
8561 sym
= isymbuf
+ symidx
;
8562 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8564 /* It is a local symbol: move it to the
8565 "absolute" section and give it a value. */
8566 sym
->st_shndx
= SHN_ABS
;
8567 sym
->st_value
= val
;
8570 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8574 /* It is a global symbol: set its link type
8575 to "defined" and give it a value. */
8577 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8578 h
= sym_hashes
[symidx
- extsymoff
];
8579 while (h
->root
.type
== bfd_link_hash_indirect
8580 || h
->root
.type
== bfd_link_hash_warning
)
8581 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8582 h
->root
.type
= bfd_link_hash_defined
;
8583 h
->root
.u
.def
.value
= val
;
8584 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8588 resolve_symbol (const char *name
,
8590 struct elf_final_link_info
*flinfo
,
8592 Elf_Internal_Sym
*isymbuf
,
8595 Elf_Internal_Sym
*sym
;
8596 struct bfd_link_hash_entry
*global_entry
;
8597 const char *candidate
= NULL
;
8598 Elf_Internal_Shdr
*symtab_hdr
;
8601 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8603 for (i
= 0; i
< locsymcount
; ++ i
)
8607 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8610 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8611 symtab_hdr
->sh_link
,
8614 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8615 name
, candidate
, (unsigned long) sym
->st_value
);
8617 if (candidate
&& strcmp (candidate
, name
) == 0)
8619 asection
*sec
= flinfo
->sections
[i
];
8621 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8622 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8624 printf ("Found symbol with value %8.8lx\n",
8625 (unsigned long) *result
);
8631 /* Hmm, haven't found it yet. perhaps it is a global. */
8632 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8633 FALSE
, FALSE
, TRUE
);
8637 if (global_entry
->type
== bfd_link_hash_defined
8638 || global_entry
->type
== bfd_link_hash_defweak
)
8640 *result
= (global_entry
->u
.def
.value
8641 + global_entry
->u
.def
.section
->output_section
->vma
8642 + global_entry
->u
.def
.section
->output_offset
);
8644 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8645 global_entry
->root
.string
, (unsigned long) *result
);
8653 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8654 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8655 names like "foo.end" which is the end address of section "foo". */
8658 resolve_section (const char *name
,
8666 for (curr
= sections
; curr
; curr
= curr
->next
)
8667 if (strcmp (curr
->name
, name
) == 0)
8669 *result
= curr
->vma
;
8673 /* Hmm. still haven't found it. try pseudo-section names. */
8674 /* FIXME: This could be coded more efficiently... */
8675 for (curr
= sections
; curr
; curr
= curr
->next
)
8677 len
= strlen (curr
->name
);
8678 if (len
> strlen (name
))
8681 if (strncmp (curr
->name
, name
, len
) == 0)
8683 if (strncmp (".end", name
+ len
, 4) == 0)
8685 *result
= (curr
->vma
8686 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8690 /* Insert more pseudo-section names here, if you like. */
8698 undefined_reference (const char *reftype
, const char *name
)
8700 /* xgettext:c-format */
8701 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8703 bfd_set_error (bfd_error_bad_value
);
8707 eval_symbol (bfd_vma
*result
,
8710 struct elf_final_link_info
*flinfo
,
8712 Elf_Internal_Sym
*isymbuf
,
8721 const char *sym
= *symp
;
8723 bfd_boolean symbol_is_section
= FALSE
;
8728 if (len
< 1 || len
> sizeof (symbuf
))
8730 bfd_set_error (bfd_error_invalid_operation
);
8743 *result
= strtoul (sym
, (char **) symp
, 16);
8747 symbol_is_section
= TRUE
;
8751 symlen
= strtol (sym
, (char **) symp
, 10);
8752 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8754 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8756 bfd_set_error (bfd_error_invalid_operation
);
8760 memcpy (symbuf
, sym
, symlen
);
8761 symbuf
[symlen
] = '\0';
8762 *symp
= sym
+ symlen
;
8764 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8765 the symbol as a section, or vice-versa. so we're pretty liberal in our
8766 interpretation here; section means "try section first", not "must be a
8767 section", and likewise with symbol. */
8769 if (symbol_is_section
)
8771 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8772 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8773 isymbuf
, locsymcount
))
8775 undefined_reference ("section", symbuf
);
8781 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8782 isymbuf
, locsymcount
)
8783 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8786 undefined_reference ("symbol", symbuf
);
8793 /* All that remains are operators. */
8795 #define UNARY_OP(op) \
8796 if (strncmp (sym, #op, strlen (#op)) == 0) \
8798 sym += strlen (#op); \
8802 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8803 isymbuf, locsymcount, signed_p)) \
8806 *result = op ((bfd_signed_vma) a); \
8812 #define BINARY_OP_HEAD(op) \
8813 if (strncmp (sym, #op, strlen (#op)) == 0) \
8815 sym += strlen (#op); \
8819 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8820 isymbuf, locsymcount, signed_p)) \
8823 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8824 isymbuf, locsymcount, signed_p)) \
8826 #define BINARY_OP_TAIL(op) \
8828 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8833 #define BINARY_OP(op) BINARY_OP_HEAD(op) BINARY_OP_TAIL(op)
8837 BINARY_OP_HEAD (<<);
8838 if (b
>= sizeof (a
) * CHAR_BIT
)
8844 BINARY_OP_TAIL (<<);
8845 BINARY_OP_HEAD (>>);
8846 if (b
>= sizeof (a
) * CHAR_BIT
)
8848 *result
= signed_p
&& (bfd_signed_vma
) a
< 0 ? -1 : 0;
8851 BINARY_OP_TAIL (>>);
8864 _bfd_error_handler (_("division by zero"));
8865 bfd_set_error (bfd_error_bad_value
);
8872 _bfd_error_handler (_("division by zero"));
8873 bfd_set_error (bfd_error_bad_value
);
8886 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8887 bfd_set_error (bfd_error_invalid_operation
);
8893 put_value (bfd_vma size
,
8894 unsigned long chunksz
,
8899 location
+= (size
- chunksz
);
8901 for (; size
; size
-= chunksz
, location
-= chunksz
)
8906 bfd_put_8 (input_bfd
, x
, location
);
8910 bfd_put_16 (input_bfd
, x
, location
);
8914 bfd_put_32 (input_bfd
, x
, location
);
8915 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8921 bfd_put_64 (input_bfd
, x
, location
);
8922 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8935 get_value (bfd_vma size
,
8936 unsigned long chunksz
,
8943 /* Sanity checks. */
8944 BFD_ASSERT (chunksz
<= sizeof (x
)
8947 && (size
% chunksz
) == 0
8948 && input_bfd
!= NULL
8949 && location
!= NULL
);
8951 if (chunksz
== sizeof (x
))
8953 BFD_ASSERT (size
== chunksz
);
8955 /* Make sure that we do not perform an undefined shift operation.
8956 We know that size == chunksz so there will only be one iteration
8957 of the loop below. */
8961 shift
= 8 * chunksz
;
8963 for (; size
; size
-= chunksz
, location
+= chunksz
)
8968 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
8971 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
8974 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
8978 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
8989 decode_complex_addend (unsigned long *start
, /* in bits */
8990 unsigned long *oplen
, /* in bits */
8991 unsigned long *len
, /* in bits */
8992 unsigned long *wordsz
, /* in bytes */
8993 unsigned long *chunksz
, /* in bytes */
8994 unsigned long *lsb0_p
,
8995 unsigned long *signed_p
,
8996 unsigned long *trunc_p
,
8997 unsigned long encoded
)
8999 * start
= encoded
& 0x3F;
9000 * len
= (encoded
>> 6) & 0x3F;
9001 * oplen
= (encoded
>> 12) & 0x3F;
9002 * wordsz
= (encoded
>> 18) & 0xF;
9003 * chunksz
= (encoded
>> 22) & 0xF;
9004 * lsb0_p
= (encoded
>> 27) & 1;
9005 * signed_p
= (encoded
>> 28) & 1;
9006 * trunc_p
= (encoded
>> 29) & 1;
9009 bfd_reloc_status_type
9010 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
9011 asection
*input_section
,
9013 Elf_Internal_Rela
*rel
,
9016 bfd_vma shift
, x
, mask
;
9017 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
9018 bfd_reloc_status_type r
;
9019 bfd_size_type octets
;
9021 /* Perform this reloc, since it is complex.
9022 (this is not to say that it necessarily refers to a complex
9023 symbol; merely that it is a self-describing CGEN based reloc.
9024 i.e. the addend has the complete reloc information (bit start, end,
9025 word size, etc) encoded within it.). */
9027 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
9028 &chunksz
, &lsb0_p
, &signed_p
,
9029 &trunc_p
, rel
->r_addend
);
9031 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
9034 shift
= (start
+ 1) - len
;
9036 shift
= (8 * wordsz
) - (start
+ len
);
9038 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
9039 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
9042 printf ("Doing complex reloc: "
9043 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
9044 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
9045 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
9046 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
9047 oplen
, (unsigned long) x
, (unsigned long) mask
,
9048 (unsigned long) relocation
);
9053 /* Now do an overflow check. */
9054 r
= bfd_check_overflow ((signed_p
9055 ? complain_overflow_signed
9056 : complain_overflow_unsigned
),
9057 len
, 0, (8 * wordsz
),
9061 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
9064 printf (" relocation: %8.8lx\n"
9065 " shifted mask: %8.8lx\n"
9066 " shifted/masked reloc: %8.8lx\n"
9067 " result: %8.8lx\n",
9068 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
9069 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
9071 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
9075 /* Functions to read r_offset from external (target order) reloc
9076 entry. Faster than bfd_getl32 et al, because we let the compiler
9077 know the value is aligned. */
9080 ext32l_r_offset (const void *p
)
9087 const union aligned32
*a
9088 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9090 uint32_t aval
= ( (uint32_t) a
->c
[0]
9091 | (uint32_t) a
->c
[1] << 8
9092 | (uint32_t) a
->c
[2] << 16
9093 | (uint32_t) a
->c
[3] << 24);
9098 ext32b_r_offset (const void *p
)
9105 const union aligned32
*a
9106 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9108 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
9109 | (uint32_t) a
->c
[1] << 16
9110 | (uint32_t) a
->c
[2] << 8
9111 | (uint32_t) a
->c
[3]);
9115 #ifdef BFD_HOST_64_BIT
9117 ext64l_r_offset (const void *p
)
9124 const union aligned64
*a
9125 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9127 uint64_t aval
= ( (uint64_t) a
->c
[0]
9128 | (uint64_t) a
->c
[1] << 8
9129 | (uint64_t) a
->c
[2] << 16
9130 | (uint64_t) a
->c
[3] << 24
9131 | (uint64_t) a
->c
[4] << 32
9132 | (uint64_t) a
->c
[5] << 40
9133 | (uint64_t) a
->c
[6] << 48
9134 | (uint64_t) a
->c
[7] << 56);
9139 ext64b_r_offset (const void *p
)
9146 const union aligned64
*a
9147 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9149 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9150 | (uint64_t) a
->c
[1] << 48
9151 | (uint64_t) a
->c
[2] << 40
9152 | (uint64_t) a
->c
[3] << 32
9153 | (uint64_t) a
->c
[4] << 24
9154 | (uint64_t) a
->c
[5] << 16
9155 | (uint64_t) a
->c
[6] << 8
9156 | (uint64_t) a
->c
[7]);
9161 /* When performing a relocatable link, the input relocations are
9162 preserved. But, if they reference global symbols, the indices
9163 referenced must be updated. Update all the relocations found in
9167 elf_link_adjust_relocs (bfd
*abfd
,
9169 struct bfd_elf_section_reloc_data
*reldata
,
9171 struct bfd_link_info
*info
)
9174 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9176 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9177 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9178 bfd_vma r_type_mask
;
9180 unsigned int count
= reldata
->count
;
9181 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9183 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9185 swap_in
= bed
->s
->swap_reloc_in
;
9186 swap_out
= bed
->s
->swap_reloc_out
;
9188 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9190 swap_in
= bed
->s
->swap_reloca_in
;
9191 swap_out
= bed
->s
->swap_reloca_out
;
9196 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9199 if (bed
->s
->arch_size
== 32)
9206 r_type_mask
= 0xffffffff;
9210 erela
= reldata
->hdr
->contents
;
9211 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9213 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9216 if (*rel_hash
== NULL
)
9219 if ((*rel_hash
)->indx
== -2
9220 && info
->gc_sections
9221 && ! info
->gc_keep_exported
)
9223 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9224 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9226 (*rel_hash
)->root
.root
.string
);
9227 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9229 bfd_set_error (bfd_error_invalid_operation
);
9232 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9234 (*swap_in
) (abfd
, erela
, irela
);
9235 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9236 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9237 | (irela
[j
].r_info
& r_type_mask
));
9238 (*swap_out
) (abfd
, irela
, erela
);
9241 if (bed
->elf_backend_update_relocs
)
9242 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9244 if (sort
&& count
!= 0)
9246 bfd_vma (*ext_r_off
) (const void *);
9249 bfd_byte
*base
, *end
, *p
, *loc
;
9250 bfd_byte
*buf
= NULL
;
9252 if (bed
->s
->arch_size
== 32)
9254 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9255 ext_r_off
= ext32l_r_offset
;
9256 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9257 ext_r_off
= ext32b_r_offset
;
9263 #ifdef BFD_HOST_64_BIT
9264 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9265 ext_r_off
= ext64l_r_offset
;
9266 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9267 ext_r_off
= ext64b_r_offset
;
9273 /* Must use a stable sort here. A modified insertion sort,
9274 since the relocs are mostly sorted already. */
9275 elt_size
= reldata
->hdr
->sh_entsize
;
9276 base
= reldata
->hdr
->contents
;
9277 end
= base
+ count
* elt_size
;
9278 if (elt_size
> sizeof (Elf64_External_Rela
))
9281 /* Ensure the first element is lowest. This acts as a sentinel,
9282 speeding the main loop below. */
9283 r_off
= (*ext_r_off
) (base
);
9284 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9286 bfd_vma r_off2
= (*ext_r_off
) (p
);
9295 /* Don't just swap *base and *loc as that changes the order
9296 of the original base[0] and base[1] if they happen to
9297 have the same r_offset. */
9298 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9299 memcpy (onebuf
, loc
, elt_size
);
9300 memmove (base
+ elt_size
, base
, loc
- base
);
9301 memcpy (base
, onebuf
, elt_size
);
9304 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9306 /* base to p is sorted, *p is next to insert. */
9307 r_off
= (*ext_r_off
) (p
);
9308 /* Search the sorted region for location to insert. */
9310 while (r_off
< (*ext_r_off
) (loc
))
9315 /* Chances are there is a run of relocs to insert here,
9316 from one of more input files. Files are not always
9317 linked in order due to the way elf_link_input_bfd is
9318 called. See pr17666. */
9319 size_t sortlen
= p
- loc
;
9320 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9321 size_t runlen
= elt_size
;
9322 size_t buf_size
= 96 * 1024;
9323 while (p
+ runlen
< end
9324 && (sortlen
<= buf_size
9325 || runlen
+ elt_size
<= buf_size
)
9326 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9330 buf
= bfd_malloc (buf_size
);
9334 if (runlen
< sortlen
)
9336 memcpy (buf
, p
, runlen
);
9337 memmove (loc
+ runlen
, loc
, sortlen
);
9338 memcpy (loc
, buf
, runlen
);
9342 memcpy (buf
, loc
, sortlen
);
9343 memmove (loc
, p
, runlen
);
9344 memcpy (loc
+ runlen
, buf
, sortlen
);
9346 p
+= runlen
- elt_size
;
9349 /* Hashes are no longer valid. */
9350 free (reldata
->hashes
);
9351 reldata
->hashes
= NULL
;
9357 struct elf_link_sort_rela
9363 enum elf_reloc_type_class type
;
9364 /* We use this as an array of size int_rels_per_ext_rel. */
9365 Elf_Internal_Rela rela
[1];
9368 /* qsort stability here and for cmp2 is only an issue if multiple
9369 dynamic relocations are emitted at the same address. But targets
9370 that apply a series of dynamic relocations each operating on the
9371 result of the prior relocation can't use -z combreloc as
9372 implemented anyway. Such schemes tend to be broken by sorting on
9373 symbol index. That leaves dynamic NONE relocs as the only other
9374 case where ld might emit multiple relocs at the same address, and
9375 those are only emitted due to target bugs. */
9378 elf_link_sort_cmp1 (const void *A
, const void *B
)
9380 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9381 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9382 int relativea
, relativeb
;
9384 relativea
= a
->type
== reloc_class_relative
;
9385 relativeb
= b
->type
== reloc_class_relative
;
9387 if (relativea
< relativeb
)
9389 if (relativea
> relativeb
)
9391 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9393 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9395 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9397 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9403 elf_link_sort_cmp2 (const void *A
, const void *B
)
9405 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9406 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9408 if (a
->type
< b
->type
)
9410 if (a
->type
> b
->type
)
9412 if (a
->u
.offset
< b
->u
.offset
)
9414 if (a
->u
.offset
> b
->u
.offset
)
9416 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9418 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9424 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9426 asection
*dynamic_relocs
;
9429 bfd_size_type count
, size
;
9430 size_t i
, ret
, sort_elt
, ext_size
;
9431 bfd_byte
*sort
, *s_non_relative
, *p
;
9432 struct elf_link_sort_rela
*sq
;
9433 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9434 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9435 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9436 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9437 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9438 struct bfd_link_order
*lo
;
9440 bfd_boolean use_rela
;
9442 /* Find a dynamic reloc section. */
9443 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9444 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9445 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9446 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9448 bfd_boolean use_rela_initialised
= FALSE
;
9450 /* This is just here to stop gcc from complaining.
9451 Its initialization checking code is not perfect. */
9454 /* Both sections are present. Examine the sizes
9455 of the indirect sections to help us choose. */
9456 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9457 if (lo
->type
== bfd_indirect_link_order
)
9459 asection
*o
= lo
->u
.indirect
.section
;
9461 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9463 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9464 /* Section size is divisible by both rel and rela sizes.
9465 It is of no help to us. */
9469 /* Section size is only divisible by rela. */
9470 if (use_rela_initialised
&& !use_rela
)
9472 _bfd_error_handler (_("%pB: unable to sort relocs - "
9473 "they are in more than one size"),
9475 bfd_set_error (bfd_error_invalid_operation
);
9481 use_rela_initialised
= TRUE
;
9485 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9487 /* Section size is only divisible by rel. */
9488 if (use_rela_initialised
&& use_rela
)
9490 _bfd_error_handler (_("%pB: unable to sort relocs - "
9491 "they are in more than one size"),
9493 bfd_set_error (bfd_error_invalid_operation
);
9499 use_rela_initialised
= TRUE
;
9504 /* The section size is not divisible by either -
9505 something is wrong. */
9506 _bfd_error_handler (_("%pB: unable to sort relocs - "
9507 "they are of an unknown size"), abfd
);
9508 bfd_set_error (bfd_error_invalid_operation
);
9513 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9514 if (lo
->type
== bfd_indirect_link_order
)
9516 asection
*o
= lo
->u
.indirect
.section
;
9518 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9520 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9521 /* Section size is divisible by both rel and rela sizes.
9522 It is of no help to us. */
9526 /* Section size is only divisible by rela. */
9527 if (use_rela_initialised
&& !use_rela
)
9529 _bfd_error_handler (_("%pB: unable to sort relocs - "
9530 "they are in more than one size"),
9532 bfd_set_error (bfd_error_invalid_operation
);
9538 use_rela_initialised
= TRUE
;
9542 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9544 /* Section size is only divisible by rel. */
9545 if (use_rela_initialised
&& use_rela
)
9547 _bfd_error_handler (_("%pB: unable to sort relocs - "
9548 "they are in more than one size"),
9550 bfd_set_error (bfd_error_invalid_operation
);
9556 use_rela_initialised
= TRUE
;
9561 /* The section size is not divisible by either -
9562 something is wrong. */
9563 _bfd_error_handler (_("%pB: unable to sort relocs - "
9564 "they are of an unknown size"), abfd
);
9565 bfd_set_error (bfd_error_invalid_operation
);
9570 if (! use_rela_initialised
)
9574 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9576 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9583 dynamic_relocs
= rela_dyn
;
9584 ext_size
= bed
->s
->sizeof_rela
;
9585 swap_in
= bed
->s
->swap_reloca_in
;
9586 swap_out
= bed
->s
->swap_reloca_out
;
9590 dynamic_relocs
= rel_dyn
;
9591 ext_size
= bed
->s
->sizeof_rel
;
9592 swap_in
= bed
->s
->swap_reloc_in
;
9593 swap_out
= bed
->s
->swap_reloc_out
;
9597 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9598 if (lo
->type
== bfd_indirect_link_order
)
9599 size
+= lo
->u
.indirect
.section
->size
;
9601 if (size
!= dynamic_relocs
->size
)
9604 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9605 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9607 count
= dynamic_relocs
->size
/ ext_size
;
9610 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9614 (*info
->callbacks
->warning
)
9615 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9619 if (bed
->s
->arch_size
== 32)
9620 r_sym_mask
= ~(bfd_vma
) 0xff;
9622 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9624 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9625 if (lo
->type
== bfd_indirect_link_order
)
9627 bfd_byte
*erel
, *erelend
;
9628 asection
*o
= lo
->u
.indirect
.section
;
9630 if (o
->contents
== NULL
&& o
->size
!= 0)
9632 /* This is a reloc section that is being handled as a normal
9633 section. See bfd_section_from_shdr. We can't combine
9634 relocs in this case. */
9639 erelend
= o
->contents
+ o
->size
;
9640 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9642 while (erel
< erelend
)
9644 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9646 (*swap_in
) (abfd
, erel
, s
->rela
);
9647 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9648 s
->u
.sym_mask
= r_sym_mask
;
9654 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9656 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9658 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9659 if (s
->type
!= reloc_class_relative
)
9665 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9666 for (; i
< count
; i
++, p
+= sort_elt
)
9668 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9669 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9671 sp
->u
.offset
= sq
->rela
->r_offset
;
9674 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9676 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9677 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9679 /* We have plt relocs in .rela.dyn. */
9680 sq
= (struct elf_link_sort_rela
*) sort
;
9681 for (i
= 0; i
< count
; i
++)
9682 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9684 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9686 struct bfd_link_order
**plo
;
9687 /* Put srelplt link_order last. This is so the output_offset
9688 set in the next loop is correct for DT_JMPREL. */
9689 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9690 if ((*plo
)->type
== bfd_indirect_link_order
9691 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9697 plo
= &(*plo
)->next
;
9700 dynamic_relocs
->map_tail
.link_order
= lo
;
9705 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9706 if (lo
->type
== bfd_indirect_link_order
)
9708 bfd_byte
*erel
, *erelend
;
9709 asection
*o
= lo
->u
.indirect
.section
;
9712 erelend
= o
->contents
+ o
->size
;
9713 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9714 while (erel
< erelend
)
9716 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9717 (*swap_out
) (abfd
, s
->rela
, erel
);
9724 *psec
= dynamic_relocs
;
9728 /* Add a symbol to the output symbol string table. */
9731 elf_link_output_symstrtab (struct elf_final_link_info
*flinfo
,
9733 Elf_Internal_Sym
*elfsym
,
9734 asection
*input_sec
,
9735 struct elf_link_hash_entry
*h
)
9737 int (*output_symbol_hook
)
9738 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9739 struct elf_link_hash_entry
*);
9740 struct elf_link_hash_table
*hash_table
;
9741 const struct elf_backend_data
*bed
;
9742 bfd_size_type strtabsize
;
9744 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9746 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9747 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9748 if (output_symbol_hook
!= NULL
)
9750 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9755 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9756 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9757 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9758 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9762 || (input_sec
->flags
& SEC_EXCLUDE
))
9763 elfsym
->st_name
= (unsigned long) -1;
9766 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9767 to get the final offset for st_name. */
9768 char *versioned_name
= (char *) name
;
9771 if (h
->versioned
== versioned
&& h
->def_dynamic
)
9773 /* Keep only one '@' for versioned symbols defined in
9775 char *version
= strrchr (name
, ELF_VER_CHR
);
9776 char *base_end
= strchr (name
, ELF_VER_CHR
);
9777 if (version
!= base_end
)
9780 size_t len
= strlen (name
);
9781 versioned_name
= bfd_alloc (flinfo
->output_bfd
, len
);
9782 if (versioned_name
== NULL
)
9784 base_len
= base_end
- name
;
9785 memcpy (versioned_name
, name
, base_len
);
9786 memcpy (versioned_name
+ base_len
, version
,
9791 else if (flinfo
->info
->unique_symbol
9792 && ELF_ST_BIND (elfsym
->st_info
) == STB_LOCAL
)
9794 struct local_hash_entry
*lh
;
9795 switch (ELF_ST_TYPE (elfsym
->st_info
))
9801 lh
= (struct local_hash_entry
*) bfd_hash_lookup
9802 (&flinfo
->local_hash_table
, name
, TRUE
, FALSE
);
9807 /* Append ".COUNT" to duplicated local symbols. */
9809 size_t base_len
= lh
->size
;
9811 sprintf (buf
, "%lx", lh
->count
);
9814 base_len
= strlen (name
);
9815 lh
->size
= base_len
;
9817 count_len
= strlen (buf
);
9818 versioned_name
= bfd_alloc (flinfo
->output_bfd
,
9819 base_len
+ count_len
+ 2);
9820 if (versioned_name
== NULL
)
9822 memcpy (versioned_name
, name
, base_len
);
9823 versioned_name
[base_len
] = '.';
9824 memcpy (versioned_name
+ base_len
+ 1, buf
,
9832 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9833 versioned_name
, FALSE
);
9834 if (elfsym
->st_name
== (unsigned long) -1)
9838 hash_table
= elf_hash_table (flinfo
->info
);
9839 strtabsize
= hash_table
->strtabsize
;
9840 if (strtabsize
<= hash_table
->strtabcount
)
9842 strtabsize
+= strtabsize
;
9843 hash_table
->strtabsize
= strtabsize
;
9844 strtabsize
*= sizeof (*hash_table
->strtab
);
9846 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9848 if (hash_table
->strtab
== NULL
)
9851 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9852 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9853 = hash_table
->strtabcount
;
9854 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9855 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9857 flinfo
->output_bfd
->symcount
+= 1;
9858 hash_table
->strtabcount
+= 1;
9863 /* Swap symbols out to the symbol table and flush the output symbols to
9867 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9869 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9872 const struct elf_backend_data
*bed
;
9874 Elf_Internal_Shdr
*hdr
;
9878 if (!hash_table
->strtabcount
)
9881 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9883 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9885 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9886 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9890 if (flinfo
->symshndxbuf
)
9892 amt
= sizeof (Elf_External_Sym_Shndx
);
9893 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9894 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9895 if (flinfo
->symshndxbuf
== NULL
)
9902 /* Now swap out the symbols. */
9903 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9905 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9906 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9907 elfsym
->sym
.st_name
= 0;
9910 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9911 elfsym
->sym
.st_name
);
9913 /* Inform the linker of the addition of this symbol. */
9915 if (flinfo
->info
->callbacks
->ctf_new_symbol
)
9916 flinfo
->info
->callbacks
->ctf_new_symbol (elfsym
->dest_index
,
9919 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9920 ((bfd_byte
*) symbuf
9921 + (elfsym
->dest_index
9922 * bed
->s
->sizeof_sym
)),
9923 (flinfo
->symshndxbuf
9924 + elfsym
->destshndx_index
));
9927 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9928 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9929 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9930 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9931 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9933 hdr
->sh_size
+= amt
;
9941 free (hash_table
->strtab
);
9942 hash_table
->strtab
= NULL
;
9947 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9950 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9952 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9953 && sym
->st_shndx
< SHN_LORESERVE
)
9955 /* The gABI doesn't support dynamic symbols in output sections
9958 /* xgettext:c-format */
9959 (_("%pB: too many sections: %d (>= %d)"),
9960 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9961 bfd_set_error (bfd_error_nonrepresentable_section
);
9967 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9968 allowing an unsatisfied unversioned symbol in the DSO to match a
9969 versioned symbol that would normally require an explicit version.
9970 We also handle the case that a DSO references a hidden symbol
9971 which may be satisfied by a versioned symbol in another DSO. */
9974 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
9975 const struct elf_backend_data
*bed
,
9976 struct elf_link_hash_entry
*h
)
9979 struct elf_link_loaded_list
*loaded
;
9981 if (!is_elf_hash_table (info
->hash
))
9984 /* Check indirect symbol. */
9985 while (h
->root
.type
== bfd_link_hash_indirect
)
9986 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9988 switch (h
->root
.type
)
9994 case bfd_link_hash_undefined
:
9995 case bfd_link_hash_undefweak
:
9996 abfd
= h
->root
.u
.undef
.abfd
;
9998 || (abfd
->flags
& DYNAMIC
) == 0
9999 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
10003 case bfd_link_hash_defined
:
10004 case bfd_link_hash_defweak
:
10005 abfd
= h
->root
.u
.def
.section
->owner
;
10008 case bfd_link_hash_common
:
10009 abfd
= h
->root
.u
.c
.p
->section
->owner
;
10012 BFD_ASSERT (abfd
!= NULL
);
10014 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
10016 loaded
= loaded
->next
)
10019 Elf_Internal_Shdr
*hdr
;
10021 size_t extsymcount
;
10023 Elf_Internal_Shdr
*versymhdr
;
10024 Elf_Internal_Sym
*isym
;
10025 Elf_Internal_Sym
*isymend
;
10026 Elf_Internal_Sym
*isymbuf
;
10027 Elf_External_Versym
*ever
;
10028 Elf_External_Versym
*extversym
;
10030 input
= loaded
->abfd
;
10032 /* We check each DSO for a possible hidden versioned definition. */
10034 || elf_dynversym (input
) == 0)
10037 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
10039 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10040 if (elf_bad_symtab (input
))
10042 extsymcount
= symcount
;
10047 extsymcount
= symcount
- hdr
->sh_info
;
10048 extsymoff
= hdr
->sh_info
;
10051 if (extsymcount
== 0)
10054 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
10056 if (isymbuf
== NULL
)
10059 /* Read in any version definitions. */
10060 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
10061 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
10062 || (extversym
= (Elf_External_Versym
*)
10063 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
10064 versymhdr
->sh_size
)) == NULL
)
10070 ever
= extversym
+ extsymoff
;
10071 isymend
= isymbuf
+ extsymcount
;
10072 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
10075 Elf_Internal_Versym iver
;
10076 unsigned short version_index
;
10078 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
10079 || isym
->st_shndx
== SHN_UNDEF
)
10082 name
= bfd_elf_string_from_elf_section (input
,
10085 if (strcmp (name
, h
->root
.root
.string
) != 0)
10088 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
10090 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
10091 && !(h
->def_regular
10092 && h
->forced_local
))
10094 /* If we have a non-hidden versioned sym, then it should
10095 have provided a definition for the undefined sym unless
10096 it is defined in a non-shared object and forced local.
10101 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
10102 if (version_index
== 1 || version_index
== 2)
10104 /* This is the base or first version. We can use it. */
10118 /* Convert ELF common symbol TYPE. */
10121 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
10123 /* Commom symbol can only appear in relocatable link. */
10124 if (!bfd_link_relocatable (info
))
10126 switch (info
->elf_stt_common
)
10130 case elf_stt_common
:
10133 case no_elf_stt_common
:
10140 /* Add an external symbol to the symbol table. This is called from
10141 the hash table traversal routine. When generating a shared object,
10142 we go through the symbol table twice. The first time we output
10143 anything that might have been forced to local scope in a version
10144 script. The second time we output the symbols that are still
10148 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
10150 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
10151 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
10152 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
10154 Elf_Internal_Sym sym
;
10155 asection
*input_sec
;
10156 const struct elf_backend_data
*bed
;
10161 if (h
->root
.type
== bfd_link_hash_warning
)
10163 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10164 if (h
->root
.type
== bfd_link_hash_new
)
10168 /* Decide whether to output this symbol in this pass. */
10169 if (eoinfo
->localsyms
)
10171 if (!h
->forced_local
)
10176 if (h
->forced_local
)
10180 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10182 if (h
->root
.type
== bfd_link_hash_undefined
)
10184 /* If we have an undefined symbol reference here then it must have
10185 come from a shared library that is being linked in. (Undefined
10186 references in regular files have already been handled unless
10187 they are in unreferenced sections which are removed by garbage
10189 bfd_boolean ignore_undef
= FALSE
;
10191 /* Some symbols may be special in that the fact that they're
10192 undefined can be safely ignored - let backend determine that. */
10193 if (bed
->elf_backend_ignore_undef_symbol
)
10194 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
10196 /* If we are reporting errors for this situation then do so now. */
10198 && h
->ref_dynamic_nonweak
10199 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
10200 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10201 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10203 flinfo
->info
->callbacks
->undefined_symbol
10204 (flinfo
->info
, h
->root
.root
.string
,
10205 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10206 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10207 && !flinfo
->info
->warn_unresolved_syms
);
10210 /* Strip a global symbol defined in a discarded section. */
10215 /* We should also warn if a forced local symbol is referenced from
10216 shared libraries. */
10217 if (bfd_link_executable (flinfo
->info
)
10222 && h
->ref_dynamic_nonweak
10223 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10227 struct elf_link_hash_entry
*hi
= h
;
10229 /* Check indirect symbol. */
10230 while (hi
->root
.type
== bfd_link_hash_indirect
)
10231 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10233 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10234 /* xgettext:c-format */
10235 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10236 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10237 /* xgettext:c-format */
10238 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10240 /* xgettext:c-format */
10241 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10242 def_bfd
= flinfo
->output_bfd
;
10243 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10244 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10245 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10246 h
->root
.root
.string
, def_bfd
);
10247 bfd_set_error (bfd_error_bad_value
);
10248 eoinfo
->failed
= TRUE
;
10252 /* We don't want to output symbols that have never been mentioned by
10253 a regular file, or that we have been told to strip. However, if
10254 h->indx is set to -2, the symbol is used by a reloc and we must
10259 else if ((h
->def_dynamic
10261 || h
->root
.type
== bfd_link_hash_new
)
10263 && !h
->ref_regular
)
10265 else if (flinfo
->info
->strip
== strip_all
)
10267 else if (flinfo
->info
->strip
== strip_some
10268 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10269 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
10271 else if ((h
->root
.type
== bfd_link_hash_defined
10272 || h
->root
.type
== bfd_link_hash_defweak
)
10273 && ((flinfo
->info
->strip_discarded
10274 && discarded_section (h
->root
.u
.def
.section
))
10275 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10276 && h
->root
.u
.def
.section
->owner
!= NULL
10277 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10279 else if ((h
->root
.type
== bfd_link_hash_undefined
10280 || h
->root
.type
== bfd_link_hash_undefweak
)
10281 && h
->root
.u
.undef
.abfd
!= NULL
10282 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10287 /* If we're stripping it, and it's not a dynamic symbol, there's
10288 nothing else to do. However, if it is a forced local symbol or
10289 an ifunc symbol we need to give the backend finish_dynamic_symbol
10290 function a chance to make it dynamic. */
10292 && h
->dynindx
== -1
10293 && type
!= STT_GNU_IFUNC
10294 && !h
->forced_local
)
10298 sym
.st_size
= h
->size
;
10299 sym
.st_other
= h
->other
;
10300 switch (h
->root
.type
)
10303 case bfd_link_hash_new
:
10304 case bfd_link_hash_warning
:
10308 case bfd_link_hash_undefined
:
10309 case bfd_link_hash_undefweak
:
10310 input_sec
= bfd_und_section_ptr
;
10311 sym
.st_shndx
= SHN_UNDEF
;
10314 case bfd_link_hash_defined
:
10315 case bfd_link_hash_defweak
:
10317 input_sec
= h
->root
.u
.def
.section
;
10318 if (input_sec
->output_section
!= NULL
)
10321 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10322 input_sec
->output_section
);
10323 if (sym
.st_shndx
== SHN_BAD
)
10326 /* xgettext:c-format */
10327 (_("%pB: could not find output section %pA for input section %pA"),
10328 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10329 bfd_set_error (bfd_error_nonrepresentable_section
);
10330 eoinfo
->failed
= TRUE
;
10334 /* ELF symbols in relocatable files are section relative,
10335 but in nonrelocatable files they are virtual
10337 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10338 if (!bfd_link_relocatable (flinfo
->info
))
10340 sym
.st_value
+= input_sec
->output_section
->vma
;
10341 if (h
->type
== STT_TLS
)
10343 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10344 if (tls_sec
!= NULL
)
10345 sym
.st_value
-= tls_sec
->vma
;
10351 BFD_ASSERT (input_sec
->owner
== NULL
10352 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10353 sym
.st_shndx
= SHN_UNDEF
;
10354 input_sec
= bfd_und_section_ptr
;
10359 case bfd_link_hash_common
:
10360 input_sec
= h
->root
.u
.c
.p
->section
;
10361 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10362 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10365 case bfd_link_hash_indirect
:
10366 /* These symbols are created by symbol versioning. They point
10367 to the decorated version of the name. For example, if the
10368 symbol foo@@GNU_1.2 is the default, which should be used when
10369 foo is used with no version, then we add an indirect symbol
10370 foo which points to foo@@GNU_1.2. We ignore these symbols,
10371 since the indirected symbol is already in the hash table. */
10375 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10376 switch (h
->root
.type
)
10378 case bfd_link_hash_common
:
10379 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10381 case bfd_link_hash_defined
:
10382 case bfd_link_hash_defweak
:
10383 if (bed
->common_definition (&sym
))
10384 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10388 case bfd_link_hash_undefined
:
10389 case bfd_link_hash_undefweak
:
10395 if (h
->forced_local
)
10397 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10398 /* Turn off visibility on local symbol. */
10399 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10401 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10402 else if (h
->unique_global
&& h
->def_regular
)
10403 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10404 else if (h
->root
.type
== bfd_link_hash_undefweak
10405 || h
->root
.type
== bfd_link_hash_defweak
)
10406 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10408 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10409 sym
.st_target_internal
= h
->target_internal
;
10411 /* Give the processor backend a chance to tweak the symbol value,
10412 and also to finish up anything that needs to be done for this
10413 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10414 forced local syms when non-shared is due to a historical quirk.
10415 STT_GNU_IFUNC symbol must go through PLT. */
10416 if ((h
->type
== STT_GNU_IFUNC
10418 && !bfd_link_relocatable (flinfo
->info
))
10419 || ((h
->dynindx
!= -1
10420 || h
->forced_local
)
10421 && ((bfd_link_pic (flinfo
->info
)
10422 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10423 || h
->root
.type
!= bfd_link_hash_undefweak
))
10424 || !h
->forced_local
)
10425 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10427 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10428 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10430 eoinfo
->failed
= TRUE
;
10435 /* If we are marking the symbol as undefined, and there are no
10436 non-weak references to this symbol from a regular object, then
10437 mark the symbol as weak undefined; if there are non-weak
10438 references, mark the symbol as strong. We can't do this earlier,
10439 because it might not be marked as undefined until the
10440 finish_dynamic_symbol routine gets through with it. */
10441 if (sym
.st_shndx
== SHN_UNDEF
10443 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10444 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10447 type
= ELF_ST_TYPE (sym
.st_info
);
10449 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10450 if (type
== STT_GNU_IFUNC
)
10453 if (h
->ref_regular_nonweak
)
10454 bindtype
= STB_GLOBAL
;
10456 bindtype
= STB_WEAK
;
10457 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10460 /* If this is a symbol defined in a dynamic library, don't use the
10461 symbol size from the dynamic library. Relinking an executable
10462 against a new library may introduce gratuitous changes in the
10463 executable's symbols if we keep the size. */
10464 if (sym
.st_shndx
== SHN_UNDEF
10469 /* If a non-weak symbol with non-default visibility is not defined
10470 locally, it is a fatal error. */
10471 if (!bfd_link_relocatable (flinfo
->info
)
10472 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10473 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10474 && h
->root
.type
== bfd_link_hash_undefined
10475 && !h
->def_regular
)
10479 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10480 /* xgettext:c-format */
10481 msg
= _("%pB: protected symbol `%s' isn't defined");
10482 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10483 /* xgettext:c-format */
10484 msg
= _("%pB: internal symbol `%s' isn't defined");
10486 /* xgettext:c-format */
10487 msg
= _("%pB: hidden symbol `%s' isn't defined");
10488 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10489 bfd_set_error (bfd_error_bad_value
);
10490 eoinfo
->failed
= TRUE
;
10494 /* If this symbol should be put in the .dynsym section, then put it
10495 there now. We already know the symbol index. We also fill in
10496 the entry in the .hash section. */
10497 if (h
->dynindx
!= -1
10498 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10499 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10500 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10504 /* Since there is no version information in the dynamic string,
10505 if there is no version info in symbol version section, we will
10506 have a run-time problem if not linking executable, referenced
10507 by shared library, or not bound locally. */
10508 if (h
->verinfo
.verdef
== NULL
10509 && (!bfd_link_executable (flinfo
->info
)
10511 || !h
->def_regular
))
10513 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10515 if (p
&& p
[1] != '\0')
10518 /* xgettext:c-format */
10519 (_("%pB: no symbol version section for versioned symbol `%s'"),
10520 flinfo
->output_bfd
, h
->root
.root
.string
);
10521 eoinfo
->failed
= TRUE
;
10526 sym
.st_name
= h
->dynstr_index
;
10527 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10528 + h
->dynindx
* bed
->s
->sizeof_sym
);
10529 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10531 eoinfo
->failed
= TRUE
;
10535 /* Inform the linker of the addition of this symbol. */
10537 if (flinfo
->info
->callbacks
->ctf_new_dynsym
)
10538 flinfo
->info
->callbacks
->ctf_new_dynsym (h
->dynindx
, &sym
);
10540 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10542 if (flinfo
->hash_sec
!= NULL
)
10544 size_t hash_entry_size
;
10545 bfd_byte
*bucketpos
;
10547 size_t bucketcount
;
10550 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10551 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10554 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10555 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10556 + (bucket
+ 2) * hash_entry_size
);
10557 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10558 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10560 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10561 ((bfd_byte
*) flinfo
->hash_sec
->contents
10562 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10565 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10567 Elf_Internal_Versym iversym
;
10568 Elf_External_Versym
*eversym
;
10570 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10572 if (h
->verinfo
.verdef
== NULL
10573 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10574 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10575 iversym
.vs_vers
= 1;
10577 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10581 if (h
->verinfo
.vertree
== NULL
)
10582 iversym
.vs_vers
= 1;
10584 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10585 if (flinfo
->info
->create_default_symver
)
10589 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10590 defined locally. */
10591 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10592 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10594 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10595 eversym
+= h
->dynindx
;
10596 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10600 /* If the symbol is undefined, and we didn't output it to .dynsym,
10601 strip it from .symtab too. Obviously we can't do this for
10602 relocatable output or when needed for --emit-relocs. */
10603 else if (input_sec
== bfd_und_section_ptr
10605 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10606 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10607 && !bfd_link_relocatable (flinfo
->info
))
10610 /* Also strip others that we couldn't earlier due to dynamic symbol
10614 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10617 /* Output a FILE symbol so that following locals are not associated
10618 with the wrong input file. We need one for forced local symbols
10619 if we've seen more than one FILE symbol or when we have exactly
10620 one FILE symbol but global symbols are present in a file other
10621 than the one with the FILE symbol. We also need one if linker
10622 defined symbols are present. In practice these conditions are
10623 always met, so just emit the FILE symbol unconditionally. */
10624 if (eoinfo
->localsyms
10625 && !eoinfo
->file_sym_done
10626 && eoinfo
->flinfo
->filesym_count
!= 0)
10628 Elf_Internal_Sym fsym
;
10630 memset (&fsym
, 0, sizeof (fsym
));
10631 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10632 fsym
.st_shndx
= SHN_ABS
;
10633 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10634 bfd_und_section_ptr
, NULL
))
10637 eoinfo
->file_sym_done
= TRUE
;
10640 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10641 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10645 eoinfo
->failed
= TRUE
;
10650 else if (h
->indx
== -2)
10656 /* Return TRUE if special handling is done for relocs in SEC against
10657 symbols defined in discarded sections. */
10660 elf_section_ignore_discarded_relocs (asection
*sec
)
10662 const struct elf_backend_data
*bed
;
10664 switch (sec
->sec_info_type
)
10666 case SEC_INFO_TYPE_STABS
:
10667 case SEC_INFO_TYPE_EH_FRAME
:
10668 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10674 bed
= get_elf_backend_data (sec
->owner
);
10675 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10676 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10682 /* Return a mask saying how ld should treat relocations in SEC against
10683 symbols defined in discarded sections. If this function returns
10684 COMPLAIN set, ld will issue a warning message. If this function
10685 returns PRETEND set, and the discarded section was link-once and the
10686 same size as the kept link-once section, ld will pretend that the
10687 symbol was actually defined in the kept section. Otherwise ld will
10688 zero the reloc (at least that is the intent, but some cooperation by
10689 the target dependent code is needed, particularly for REL targets). */
10692 _bfd_elf_default_action_discarded (asection
*sec
)
10694 if (sec
->flags
& SEC_DEBUGGING
)
10697 if (strcmp (".eh_frame", sec
->name
) == 0)
10700 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10703 return COMPLAIN
| PRETEND
;
10706 /* Find a match between a section and a member of a section group. */
10709 match_group_member (asection
*sec
, asection
*group
,
10710 struct bfd_link_info
*info
)
10712 asection
*first
= elf_next_in_group (group
);
10713 asection
*s
= first
;
10717 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10720 s
= elf_next_in_group (s
);
10728 /* Check if the kept section of a discarded section SEC can be used
10729 to replace it. Return the replacement if it is OK. Otherwise return
10733 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10737 kept
= sec
->kept_section
;
10740 if ((kept
->flags
& SEC_GROUP
) != 0)
10741 kept
= match_group_member (sec
, kept
, info
);
10744 if ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10745 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
))
10749 /* Get the real kept section. */
10751 for (next
= kept
->kept_section
;
10753 next
= next
->kept_section
)
10757 sec
->kept_section
= kept
;
10762 /* Link an input file into the linker output file. This function
10763 handles all the sections and relocations of the input file at once.
10764 This is so that we only have to read the local symbols once, and
10765 don't have to keep them in memory. */
10768 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10770 int (*relocate_section
)
10771 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10772 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10774 Elf_Internal_Shdr
*symtab_hdr
;
10775 size_t locsymcount
;
10777 Elf_Internal_Sym
*isymbuf
;
10778 Elf_Internal_Sym
*isym
;
10779 Elf_Internal_Sym
*isymend
;
10781 asection
**ppsection
;
10783 const struct elf_backend_data
*bed
;
10784 struct elf_link_hash_entry
**sym_hashes
;
10785 bfd_size_type address_size
;
10786 bfd_vma r_type_mask
;
10788 bfd_boolean have_file_sym
= FALSE
;
10790 output_bfd
= flinfo
->output_bfd
;
10791 bed
= get_elf_backend_data (output_bfd
);
10792 relocate_section
= bed
->elf_backend_relocate_section
;
10794 /* If this is a dynamic object, we don't want to do anything here:
10795 we don't want the local symbols, and we don't want the section
10797 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10800 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10801 if (elf_bad_symtab (input_bfd
))
10803 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10808 locsymcount
= symtab_hdr
->sh_info
;
10809 extsymoff
= symtab_hdr
->sh_info
;
10812 /* Enable GNU OSABI features in the output BFD that are used in the input
10814 if (bed
->elf_osabi
== ELFOSABI_NONE
10815 || bed
->elf_osabi
== ELFOSABI_GNU
10816 || bed
->elf_osabi
== ELFOSABI_FREEBSD
)
10817 elf_tdata (output_bfd
)->has_gnu_osabi
10818 |= (elf_tdata (input_bfd
)->has_gnu_osabi
10819 & (bfd_link_relocatable (flinfo
->info
)
10820 ? -1 : ~elf_gnu_osabi_retain
));
10822 /* Read the local symbols. */
10823 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10824 if (isymbuf
== NULL
&& locsymcount
!= 0)
10826 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10827 flinfo
->internal_syms
,
10828 flinfo
->external_syms
,
10829 flinfo
->locsym_shndx
);
10830 if (isymbuf
== NULL
)
10834 /* Find local symbol sections and adjust values of symbols in
10835 SEC_MERGE sections. Write out those local symbols we know are
10836 going into the output file. */
10837 isymend
= isymbuf
+ locsymcount
;
10838 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10840 isym
++, pindex
++, ppsection
++)
10844 Elf_Internal_Sym osym
;
10850 if (elf_bad_symtab (input_bfd
))
10852 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10859 if (isym
->st_shndx
== SHN_UNDEF
)
10860 isec
= bfd_und_section_ptr
;
10861 else if (isym
->st_shndx
== SHN_ABS
)
10862 isec
= bfd_abs_section_ptr
;
10863 else if (isym
->st_shndx
== SHN_COMMON
)
10864 isec
= bfd_com_section_ptr
;
10867 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10870 /* Don't attempt to output symbols with st_shnx in the
10871 reserved range other than SHN_ABS and SHN_COMMON. */
10872 isec
= bfd_und_section_ptr
;
10874 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10875 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10877 _bfd_merged_section_offset (output_bfd
, &isec
,
10878 elf_section_data (isec
)->sec_info
,
10884 /* Don't output the first, undefined, symbol. In fact, don't
10885 output any undefined local symbol. */
10886 if (isec
== bfd_und_section_ptr
)
10889 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10891 /* We never output section symbols. Instead, we use the
10892 section symbol of the corresponding section in the output
10897 /* If we are stripping all symbols, we don't want to output this
10899 if (flinfo
->info
->strip
== strip_all
)
10902 /* If we are discarding all local symbols, we don't want to
10903 output this one. If we are generating a relocatable output
10904 file, then some of the local symbols may be required by
10905 relocs; we output them below as we discover that they are
10907 if (flinfo
->info
->discard
== discard_all
)
10910 /* If this symbol is defined in a section which we are
10911 discarding, we don't need to keep it. */
10912 if (isym
->st_shndx
!= SHN_UNDEF
10913 && isym
->st_shndx
< SHN_LORESERVE
10914 && isec
->output_section
== NULL
10915 && flinfo
->info
->non_contiguous_regions
10916 && flinfo
->info
->non_contiguous_regions_warnings
)
10918 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10919 "discards section `%s' from '%s'\n"),
10920 isec
->name
, bfd_get_filename (isec
->owner
));
10924 if (isym
->st_shndx
!= SHN_UNDEF
10925 && isym
->st_shndx
< SHN_LORESERVE
10926 && bfd_section_removed_from_list (output_bfd
,
10927 isec
->output_section
))
10930 /* Get the name of the symbol. */
10931 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10936 /* See if we are discarding symbols with this name. */
10937 if ((flinfo
->info
->strip
== strip_some
10938 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
10940 || (((flinfo
->info
->discard
== discard_sec_merge
10941 && (isec
->flags
& SEC_MERGE
)
10942 && !bfd_link_relocatable (flinfo
->info
))
10943 || flinfo
->info
->discard
== discard_l
)
10944 && bfd_is_local_label_name (input_bfd
, name
)))
10947 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10949 if (input_bfd
->lto_output
)
10950 /* -flto puts a temp file name here. This means builds
10951 are not reproducible. Discard the symbol. */
10953 have_file_sym
= TRUE
;
10954 flinfo
->filesym_count
+= 1;
10956 if (!have_file_sym
)
10958 /* In the absence of debug info, bfd_find_nearest_line uses
10959 FILE symbols to determine the source file for local
10960 function symbols. Provide a FILE symbol here if input
10961 files lack such, so that their symbols won't be
10962 associated with a previous input file. It's not the
10963 source file, but the best we can do. */
10964 const char *filename
;
10965 have_file_sym
= TRUE
;
10966 flinfo
->filesym_count
+= 1;
10967 memset (&osym
, 0, sizeof (osym
));
10968 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10969 osym
.st_shndx
= SHN_ABS
;
10970 if (input_bfd
->lto_output
)
10973 filename
= lbasename (bfd_get_filename (input_bfd
));
10974 if (!elf_link_output_symstrtab (flinfo
, filename
, &osym
,
10975 bfd_abs_section_ptr
, NULL
))
10981 /* Adjust the section index for the output file. */
10982 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10983 isec
->output_section
);
10984 if (osym
.st_shndx
== SHN_BAD
)
10987 /* ELF symbols in relocatable files are section relative, but
10988 in executable files they are virtual addresses. Note that
10989 this code assumes that all ELF sections have an associated
10990 BFD section with a reasonable value for output_offset; below
10991 we assume that they also have a reasonable value for
10992 output_section. Any special sections must be set up to meet
10993 these requirements. */
10994 osym
.st_value
+= isec
->output_offset
;
10995 if (!bfd_link_relocatable (flinfo
->info
))
10997 osym
.st_value
+= isec
->output_section
->vma
;
10998 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
11000 /* STT_TLS symbols are relative to PT_TLS segment base. */
11001 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
11002 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
11004 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
11009 indx
= bfd_get_symcount (output_bfd
);
11010 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
11017 if (bed
->s
->arch_size
== 32)
11019 r_type_mask
= 0xff;
11025 r_type_mask
= 0xffffffff;
11030 /* Relocate the contents of each section. */
11031 sym_hashes
= elf_sym_hashes (input_bfd
);
11032 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
11034 bfd_byte
*contents
;
11036 if (! o
->linker_mark
)
11038 /* This section was omitted from the link. */
11042 if (!flinfo
->info
->resolve_section_groups
11043 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
11045 /* Deal with the group signature symbol. */
11046 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
11047 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
11048 asection
*osec
= o
->output_section
;
11050 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
11051 if (symndx
>= locsymcount
11052 || (elf_bad_symtab (input_bfd
)
11053 && flinfo
->sections
[symndx
] == NULL
))
11055 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
11056 while (h
->root
.type
== bfd_link_hash_indirect
11057 || h
->root
.type
== bfd_link_hash_warning
)
11058 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11059 /* Arrange for symbol to be output. */
11061 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
11063 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
11065 /* We'll use the output section target_index. */
11066 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11067 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
11071 if (flinfo
->indices
[symndx
] == -1)
11073 /* Otherwise output the local symbol now. */
11074 Elf_Internal_Sym sym
= isymbuf
[symndx
];
11075 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11080 name
= bfd_elf_string_from_elf_section (input_bfd
,
11081 symtab_hdr
->sh_link
,
11086 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11088 if (sym
.st_shndx
== SHN_BAD
)
11091 sym
.st_value
+= o
->output_offset
;
11093 indx
= bfd_get_symcount (output_bfd
);
11094 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
11099 flinfo
->indices
[symndx
] = indx
;
11103 elf_section_data (osec
)->this_hdr
.sh_info
11104 = flinfo
->indices
[symndx
];
11108 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11109 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
11112 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
11114 /* Section was created by _bfd_elf_link_create_dynamic_sections
11119 /* Get the contents of the section. They have been cached by a
11120 relaxation routine. Note that o is a section in an input
11121 file, so the contents field will not have been set by any of
11122 the routines which work on output files. */
11123 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
11125 contents
= elf_section_data (o
)->this_hdr
.contents
;
11126 if (bed
->caches_rawsize
11128 && o
->rawsize
< o
->size
)
11130 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
11131 contents
= flinfo
->contents
;
11136 contents
= flinfo
->contents
;
11137 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
11141 if ((o
->flags
& SEC_RELOC
) != 0)
11143 Elf_Internal_Rela
*internal_relocs
;
11144 Elf_Internal_Rela
*rel
, *relend
;
11145 int action_discarded
;
11148 /* Get the swapped relocs. */
11150 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
11151 flinfo
->internal_relocs
, FALSE
);
11152 if (internal_relocs
== NULL
11153 && o
->reloc_count
> 0)
11156 /* We need to reverse-copy input .ctors/.dtors sections if
11157 they are placed in .init_array/.finit_array for output. */
11158 if (o
->size
> address_size
11159 && ((strncmp (o
->name
, ".ctors", 6) == 0
11160 && strcmp (o
->output_section
->name
,
11161 ".init_array") == 0)
11162 || (strncmp (o
->name
, ".dtors", 6) == 0
11163 && strcmp (o
->output_section
->name
,
11164 ".fini_array") == 0))
11165 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
11167 if (o
->size
* bed
->s
->int_rels_per_ext_rel
11168 != o
->reloc_count
* address_size
)
11171 /* xgettext:c-format */
11172 (_("error: %pB: size of section %pA is not "
11173 "multiple of address size"),
11175 bfd_set_error (bfd_error_bad_value
);
11178 o
->flags
|= SEC_ELF_REVERSE_COPY
;
11181 action_discarded
= -1;
11182 if (!elf_section_ignore_discarded_relocs (o
))
11183 action_discarded
= (*bed
->action_discarded
) (o
);
11185 /* Run through the relocs evaluating complex reloc symbols and
11186 looking for relocs against symbols from discarded sections
11187 or section symbols from removed link-once sections.
11188 Complain about relocs against discarded sections. Zero
11189 relocs against removed link-once sections. */
11191 rel
= internal_relocs
;
11192 relend
= rel
+ o
->reloc_count
;
11193 for ( ; rel
< relend
; rel
++)
11195 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
11196 unsigned int s_type
;
11197 asection
**ps
, *sec
;
11198 struct elf_link_hash_entry
*h
= NULL
;
11199 const char *sym_name
;
11201 if (r_symndx
== STN_UNDEF
)
11204 if (r_symndx
>= locsymcount
11205 || (elf_bad_symtab (input_bfd
)
11206 && flinfo
->sections
[r_symndx
] == NULL
))
11208 h
= sym_hashes
[r_symndx
- extsymoff
];
11210 /* Badly formatted input files can contain relocs that
11211 reference non-existant symbols. Check here so that
11212 we do not seg fault. */
11216 /* xgettext:c-format */
11217 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
11218 "that references a non-existent global symbol"),
11219 input_bfd
, (uint64_t) rel
->r_info
, o
);
11220 bfd_set_error (bfd_error_bad_value
);
11224 while (h
->root
.type
== bfd_link_hash_indirect
11225 || h
->root
.type
== bfd_link_hash_warning
)
11226 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11230 /* If a plugin symbol is referenced from a non-IR file,
11231 mark the symbol as undefined. Note that the
11232 linker may attach linker created dynamic sections
11233 to the plugin bfd. Symbols defined in linker
11234 created sections are not plugin symbols. */
11235 if ((h
->root
.non_ir_ref_regular
11236 || h
->root
.non_ir_ref_dynamic
)
11237 && (h
->root
.type
== bfd_link_hash_defined
11238 || h
->root
.type
== bfd_link_hash_defweak
)
11239 && (h
->root
.u
.def
.section
->flags
11240 & SEC_LINKER_CREATED
) == 0
11241 && h
->root
.u
.def
.section
->owner
!= NULL
11242 && (h
->root
.u
.def
.section
->owner
->flags
11243 & BFD_PLUGIN
) != 0)
11245 h
->root
.type
= bfd_link_hash_undefined
;
11246 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11250 if (h
->root
.type
== bfd_link_hash_defined
11251 || h
->root
.type
== bfd_link_hash_defweak
)
11252 ps
= &h
->root
.u
.def
.section
;
11254 sym_name
= h
->root
.root
.string
;
11258 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11260 s_type
= ELF_ST_TYPE (sym
->st_info
);
11261 ps
= &flinfo
->sections
[r_symndx
];
11262 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11266 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11267 && !bfd_link_relocatable (flinfo
->info
))
11270 bfd_vma dot
= (rel
->r_offset
11271 + o
->output_offset
+ o
->output_section
->vma
);
11273 printf ("Encountered a complex symbol!");
11274 printf (" (input_bfd %s, section %s, reloc %ld\n",
11275 bfd_get_filename (input_bfd
), o
->name
,
11276 (long) (rel
- internal_relocs
));
11277 printf (" symbol: idx %8.8lx, name %s\n",
11278 r_symndx
, sym_name
);
11279 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11280 (unsigned long) rel
->r_info
,
11281 (unsigned long) rel
->r_offset
);
11283 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11284 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11287 /* Symbol evaluated OK. Update to absolute value. */
11288 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11293 if (action_discarded
!= -1 && ps
!= NULL
)
11295 /* Complain if the definition comes from a
11296 discarded section. */
11297 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11299 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11300 if (action_discarded
& COMPLAIN
)
11301 (*flinfo
->info
->callbacks
->einfo
)
11302 /* xgettext:c-format */
11303 (_("%X`%s' referenced in section `%pA' of %pB: "
11304 "defined in discarded section `%pA' of %pB\n"),
11305 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11307 /* Try to do the best we can to support buggy old
11308 versions of gcc. Pretend that the symbol is
11309 really defined in the kept linkonce section.
11310 FIXME: This is quite broken. Modifying the
11311 symbol here means we will be changing all later
11312 uses of the symbol, not just in this section. */
11313 if (action_discarded
& PRETEND
)
11317 kept
= _bfd_elf_check_kept_section (sec
,
11329 /* Relocate the section by invoking a back end routine.
11331 The back end routine is responsible for adjusting the
11332 section contents as necessary, and (if using Rela relocs
11333 and generating a relocatable output file) adjusting the
11334 reloc addend as necessary.
11336 The back end routine does not have to worry about setting
11337 the reloc address or the reloc symbol index.
11339 The back end routine is given a pointer to the swapped in
11340 internal symbols, and can access the hash table entries
11341 for the external symbols via elf_sym_hashes (input_bfd).
11343 When generating relocatable output, the back end routine
11344 must handle STB_LOCAL/STT_SECTION symbols specially. The
11345 output symbol is going to be a section symbol
11346 corresponding to the output section, which will require
11347 the addend to be adjusted. */
11349 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11350 input_bfd
, o
, contents
,
11358 || bfd_link_relocatable (flinfo
->info
)
11359 || flinfo
->info
->emitrelocations
)
11361 Elf_Internal_Rela
*irela
;
11362 Elf_Internal_Rela
*irelaend
, *irelamid
;
11363 bfd_vma last_offset
;
11364 struct elf_link_hash_entry
**rel_hash
;
11365 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11366 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11367 unsigned int next_erel
;
11368 bfd_boolean rela_normal
;
11369 struct bfd_elf_section_data
*esdi
, *esdo
;
11371 esdi
= elf_section_data (o
);
11372 esdo
= elf_section_data (o
->output_section
);
11373 rela_normal
= FALSE
;
11375 /* Adjust the reloc addresses and symbol indices. */
11377 irela
= internal_relocs
;
11378 irelaend
= irela
+ o
->reloc_count
;
11379 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11380 /* We start processing the REL relocs, if any. When we reach
11381 IRELAMID in the loop, we switch to the RELA relocs. */
11383 if (esdi
->rel
.hdr
!= NULL
)
11384 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11385 * bed
->s
->int_rels_per_ext_rel
);
11386 rel_hash_list
= rel_hash
;
11387 rela_hash_list
= NULL
;
11388 last_offset
= o
->output_offset
;
11389 if (!bfd_link_relocatable (flinfo
->info
))
11390 last_offset
+= o
->output_section
->vma
;
11391 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11393 unsigned long r_symndx
;
11395 Elf_Internal_Sym sym
;
11397 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11403 if (irela
== irelamid
)
11405 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11406 rela_hash_list
= rel_hash
;
11407 rela_normal
= bed
->rela_normal
;
11410 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11413 if (irela
->r_offset
>= (bfd_vma
) -2)
11415 /* This is a reloc for a deleted entry or somesuch.
11416 Turn it into an R_*_NONE reloc, at the same
11417 offset as the last reloc. elf_eh_frame.c and
11418 bfd_elf_discard_info rely on reloc offsets
11420 irela
->r_offset
= last_offset
;
11422 irela
->r_addend
= 0;
11426 irela
->r_offset
+= o
->output_offset
;
11428 /* Relocs in an executable have to be virtual addresses. */
11429 if (!bfd_link_relocatable (flinfo
->info
))
11430 irela
->r_offset
+= o
->output_section
->vma
;
11432 last_offset
= irela
->r_offset
;
11434 r_symndx
= irela
->r_info
>> r_sym_shift
;
11435 if (r_symndx
== STN_UNDEF
)
11438 if (r_symndx
>= locsymcount
11439 || (elf_bad_symtab (input_bfd
)
11440 && flinfo
->sections
[r_symndx
] == NULL
))
11442 struct elf_link_hash_entry
*rh
;
11443 unsigned long indx
;
11445 /* This is a reloc against a global symbol. We
11446 have not yet output all the local symbols, so
11447 we do not know the symbol index of any global
11448 symbol. We set the rel_hash entry for this
11449 reloc to point to the global hash table entry
11450 for this symbol. The symbol index is then
11451 set at the end of bfd_elf_final_link. */
11452 indx
= r_symndx
- extsymoff
;
11453 rh
= elf_sym_hashes (input_bfd
)[indx
];
11454 while (rh
->root
.type
== bfd_link_hash_indirect
11455 || rh
->root
.type
== bfd_link_hash_warning
)
11456 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11458 /* Setting the index to -2 tells
11459 elf_link_output_extsym that this symbol is
11460 used by a reloc. */
11461 BFD_ASSERT (rh
->indx
< 0);
11468 /* This is a reloc against a local symbol. */
11471 sym
= isymbuf
[r_symndx
];
11472 sec
= flinfo
->sections
[r_symndx
];
11473 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11475 /* I suppose the backend ought to fill in the
11476 section of any STT_SECTION symbol against a
11477 processor specific section. */
11478 r_symndx
= STN_UNDEF
;
11479 if (bfd_is_abs_section (sec
))
11481 else if (sec
== NULL
|| sec
->owner
== NULL
)
11483 bfd_set_error (bfd_error_bad_value
);
11488 asection
*osec
= sec
->output_section
;
11490 /* If we have discarded a section, the output
11491 section will be the absolute section. In
11492 case of discarded SEC_MERGE sections, use
11493 the kept section. relocate_section should
11494 have already handled discarded linkonce
11496 if (bfd_is_abs_section (osec
)
11497 && sec
->kept_section
!= NULL
11498 && sec
->kept_section
->output_section
!= NULL
)
11500 osec
= sec
->kept_section
->output_section
;
11501 irela
->r_addend
-= osec
->vma
;
11504 if (!bfd_is_abs_section (osec
))
11506 r_symndx
= osec
->target_index
;
11507 if (r_symndx
== STN_UNDEF
)
11509 irela
->r_addend
+= osec
->vma
;
11510 osec
= _bfd_nearby_section (output_bfd
, osec
,
11512 irela
->r_addend
-= osec
->vma
;
11513 r_symndx
= osec
->target_index
;
11518 /* Adjust the addend according to where the
11519 section winds up in the output section. */
11521 irela
->r_addend
+= sec
->output_offset
;
11525 if (flinfo
->indices
[r_symndx
] == -1)
11527 unsigned long shlink
;
11532 if (flinfo
->info
->strip
== strip_all
)
11534 /* You can't do ld -r -s. */
11535 bfd_set_error (bfd_error_invalid_operation
);
11539 /* This symbol was skipped earlier, but
11540 since it is needed by a reloc, we
11541 must output it now. */
11542 shlink
= symtab_hdr
->sh_link
;
11543 name
= (bfd_elf_string_from_elf_section
11544 (input_bfd
, shlink
, sym
.st_name
));
11548 osec
= sec
->output_section
;
11550 _bfd_elf_section_from_bfd_section (output_bfd
,
11552 if (sym
.st_shndx
== SHN_BAD
)
11555 sym
.st_value
+= sec
->output_offset
;
11556 if (!bfd_link_relocatable (flinfo
->info
))
11558 sym
.st_value
+= osec
->vma
;
11559 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11561 struct elf_link_hash_table
*htab
11562 = elf_hash_table (flinfo
->info
);
11564 /* STT_TLS symbols are relative to PT_TLS
11566 if (htab
->tls_sec
!= NULL
)
11567 sym
.st_value
-= htab
->tls_sec
->vma
;
11570 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11575 indx
= bfd_get_symcount (output_bfd
);
11576 ret
= elf_link_output_symstrtab (flinfo
, name
,
11582 flinfo
->indices
[r_symndx
] = indx
;
11587 r_symndx
= flinfo
->indices
[r_symndx
];
11590 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11591 | (irela
->r_info
& r_type_mask
));
11594 /* Swap out the relocs. */
11595 input_rel_hdr
= esdi
->rel
.hdr
;
11596 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11598 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11603 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11604 * bed
->s
->int_rels_per_ext_rel
);
11605 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11608 input_rela_hdr
= esdi
->rela
.hdr
;
11609 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11611 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11620 /* Write out the modified section contents. */
11621 if (bed
->elf_backend_write_section
11622 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11625 /* Section written out. */
11627 else switch (o
->sec_info_type
)
11629 case SEC_INFO_TYPE_STABS
:
11630 if (! (_bfd_write_section_stabs
11632 &elf_hash_table (flinfo
->info
)->stab_info
,
11633 o
, &elf_section_data (o
)->sec_info
, contents
)))
11636 case SEC_INFO_TYPE_MERGE
:
11637 if (! _bfd_write_merged_section (output_bfd
, o
,
11638 elf_section_data (o
)->sec_info
))
11641 case SEC_INFO_TYPE_EH_FRAME
:
11643 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11648 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11650 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11658 if (! (o
->flags
& SEC_EXCLUDE
))
11660 file_ptr offset
= (file_ptr
) o
->output_offset
;
11661 bfd_size_type todo
= o
->size
;
11663 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11665 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11667 /* Reverse-copy input section to output. */
11670 todo
-= address_size
;
11671 if (! bfd_set_section_contents (output_bfd
,
11679 offset
+= address_size
;
11683 else if (! bfd_set_section_contents (output_bfd
,
11697 /* Generate a reloc when linking an ELF file. This is a reloc
11698 requested by the linker, and does not come from any input file. This
11699 is used to build constructor and destructor tables when linking
11703 elf_reloc_link_order (bfd
*output_bfd
,
11704 struct bfd_link_info
*info
,
11705 asection
*output_section
,
11706 struct bfd_link_order
*link_order
)
11708 reloc_howto_type
*howto
;
11712 struct bfd_elf_section_reloc_data
*reldata
;
11713 struct elf_link_hash_entry
**rel_hash_ptr
;
11714 Elf_Internal_Shdr
*rel_hdr
;
11715 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11716 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11719 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11721 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11724 bfd_set_error (bfd_error_bad_value
);
11728 addend
= link_order
->u
.reloc
.p
->addend
;
11731 reldata
= &esdo
->rel
;
11732 else if (esdo
->rela
.hdr
)
11733 reldata
= &esdo
->rela
;
11740 /* Figure out the symbol index. */
11741 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11742 if (link_order
->type
== bfd_section_reloc_link_order
)
11744 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11745 BFD_ASSERT (indx
!= 0);
11746 *rel_hash_ptr
= NULL
;
11750 struct elf_link_hash_entry
*h
;
11752 /* Treat a reloc against a defined symbol as though it were
11753 actually against the section. */
11754 h
= ((struct elf_link_hash_entry
*)
11755 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11756 link_order
->u
.reloc
.p
->u
.name
,
11757 FALSE
, FALSE
, TRUE
));
11759 && (h
->root
.type
== bfd_link_hash_defined
11760 || h
->root
.type
== bfd_link_hash_defweak
))
11764 section
= h
->root
.u
.def
.section
;
11765 indx
= section
->output_section
->target_index
;
11766 *rel_hash_ptr
= NULL
;
11767 /* It seems that we ought to add the symbol value to the
11768 addend here, but in practice it has already been added
11769 because it was passed to constructor_callback. */
11770 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11772 else if (h
!= NULL
)
11774 /* Setting the index to -2 tells elf_link_output_extsym that
11775 this symbol is used by a reloc. */
11782 (*info
->callbacks
->unattached_reloc
)
11783 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11788 /* If this is an inplace reloc, we must write the addend into the
11790 if (howto
->partial_inplace
&& addend
!= 0)
11792 bfd_size_type size
;
11793 bfd_reloc_status_type rstat
;
11796 const char *sym_name
;
11797 bfd_size_type octets
;
11799 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11800 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11801 if (buf
== NULL
&& size
!= 0)
11803 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11810 case bfd_reloc_outofrange
:
11813 case bfd_reloc_overflow
:
11814 if (link_order
->type
== bfd_section_reloc_link_order
)
11815 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11817 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11818 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11819 howto
->name
, addend
, NULL
, NULL
,
11824 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11826 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11833 /* The address of a reloc is relative to the section in a
11834 relocatable file, and is a virtual address in an executable
11836 offset
= link_order
->offset
;
11837 if (! bfd_link_relocatable (info
))
11838 offset
+= output_section
->vma
;
11840 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11842 irel
[i
].r_offset
= offset
;
11843 irel
[i
].r_info
= 0;
11844 irel
[i
].r_addend
= 0;
11846 if (bed
->s
->arch_size
== 32)
11847 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11849 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11851 rel_hdr
= reldata
->hdr
;
11852 erel
= rel_hdr
->contents
;
11853 if (rel_hdr
->sh_type
== SHT_REL
)
11855 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11856 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11860 irel
[0].r_addend
= addend
;
11861 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11862 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11870 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11871 Returns TRUE upon success, FALSE otherwise. */
11874 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11876 bfd_boolean ret
= FALSE
;
11878 const struct elf_backend_data
*bed
;
11880 enum bfd_architecture arch
;
11882 asymbol
**sympp
= NULL
;
11886 elf_symbol_type
*osymbuf
;
11889 implib_bfd
= info
->out_implib_bfd
;
11890 bed
= get_elf_backend_data (abfd
);
11892 if (!bfd_set_format (implib_bfd
, bfd_object
))
11895 /* Use flag from executable but make it a relocatable object. */
11896 flags
= bfd_get_file_flags (abfd
);
11897 flags
&= ~HAS_RELOC
;
11898 if (!bfd_set_start_address (implib_bfd
, 0)
11899 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11902 /* Copy architecture of output file to import library file. */
11903 arch
= bfd_get_arch (abfd
);
11904 mach
= bfd_get_mach (abfd
);
11905 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11906 && (abfd
->target_defaulted
11907 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11910 /* Get symbol table size. */
11911 symsize
= bfd_get_symtab_upper_bound (abfd
);
11915 /* Read in the symbol table. */
11916 sympp
= (asymbol
**) bfd_malloc (symsize
);
11920 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11924 /* Allow the BFD backend to copy any private header data it
11925 understands from the output BFD to the import library BFD. */
11926 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11929 /* Filter symbols to appear in the import library. */
11930 if (bed
->elf_backend_filter_implib_symbols
)
11931 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11934 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11937 bfd_set_error (bfd_error_no_symbols
);
11938 _bfd_error_handler (_("%pB: no symbol found for import library"),
11944 /* Make symbols absolute. */
11945 amt
= symcount
* sizeof (*osymbuf
);
11946 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11947 if (osymbuf
== NULL
)
11950 for (src_count
= 0; src_count
< symcount
; src_count
++)
11952 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11953 sizeof (*osymbuf
));
11954 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11955 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11956 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11957 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11958 osymbuf
[src_count
].symbol
.value
;
11959 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11962 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
11964 /* Allow the BFD backend to copy any private data it understands
11965 from the output BFD to the import library BFD. This is done last
11966 to permit the routine to look at the filtered symbol table. */
11967 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
11970 if (!bfd_close (implib_bfd
))
11981 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
11985 if (flinfo
->symstrtab
!= NULL
)
11986 _bfd_elf_strtab_free (flinfo
->symstrtab
);
11987 free (flinfo
->contents
);
11988 free (flinfo
->external_relocs
);
11989 free (flinfo
->internal_relocs
);
11990 free (flinfo
->external_syms
);
11991 free (flinfo
->locsym_shndx
);
11992 free (flinfo
->internal_syms
);
11993 free (flinfo
->indices
);
11994 free (flinfo
->sections
);
11995 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
11996 free (flinfo
->symshndxbuf
);
11997 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
11999 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12000 free (esdo
->rel
.hashes
);
12001 free (esdo
->rela
.hashes
);
12005 /* Do the final step of an ELF link. */
12008 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12010 bfd_boolean dynamic
;
12011 bfd_boolean emit_relocs
;
12013 struct elf_final_link_info flinfo
;
12015 struct bfd_link_order
*p
;
12017 bfd_size_type max_contents_size
;
12018 bfd_size_type max_external_reloc_size
;
12019 bfd_size_type max_internal_reloc_count
;
12020 bfd_size_type max_sym_count
;
12021 bfd_size_type max_sym_shndx_count
;
12022 Elf_Internal_Sym elfsym
;
12024 Elf_Internal_Shdr
*symtab_hdr
;
12025 Elf_Internal_Shdr
*symtab_shndx_hdr
;
12026 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12027 struct elf_outext_info eoinfo
;
12028 bfd_boolean merged
;
12029 size_t relativecount
= 0;
12030 asection
*reldyn
= 0;
12032 asection
*attr_section
= NULL
;
12033 bfd_vma attr_size
= 0;
12034 const char *std_attrs_section
;
12035 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
12036 bfd_boolean sections_removed
;
12039 if (!is_elf_hash_table (htab
))
12042 if (bfd_link_pic (info
))
12043 abfd
->flags
|= DYNAMIC
;
12045 dynamic
= htab
->dynamic_sections_created
;
12046 dynobj
= htab
->dynobj
;
12048 emit_relocs
= (bfd_link_relocatable (info
)
12049 || info
->emitrelocations
);
12051 memset (&flinfo
, 0, sizeof (flinfo
));
12052 flinfo
.info
= info
;
12053 flinfo
.output_bfd
= abfd
;
12054 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
12055 if (flinfo
.symstrtab
== NULL
)
12060 flinfo
.hash_sec
= NULL
;
12061 flinfo
.symver_sec
= NULL
;
12065 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
12066 /* Note that dynsym_sec can be NULL (on VMS). */
12067 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
12068 /* Note that it is OK if symver_sec is NULL. */
12071 if (info
->unique_symbol
12072 && !bfd_hash_table_init (&flinfo
.local_hash_table
,
12073 local_hash_newfunc
,
12074 sizeof (struct local_hash_entry
)))
12077 /* The object attributes have been merged. Remove the input
12078 sections from the link, and set the contents of the output
12080 sections_removed
= FALSE
;
12081 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
12082 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12084 bfd_boolean remove_section
= FALSE
;
12086 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
12087 || strcmp (o
->name
, ".gnu.attributes") == 0)
12089 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12091 asection
*input_section
;
12093 if (p
->type
!= bfd_indirect_link_order
)
12095 input_section
= p
->u
.indirect
.section
;
12096 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12097 elf_link_input_bfd ignores this section. */
12098 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12101 attr_size
= bfd_elf_obj_attr_size (abfd
);
12102 bfd_set_section_size (o
, attr_size
);
12103 /* Skip this section later on. */
12104 o
->map_head
.link_order
= NULL
;
12108 remove_section
= TRUE
;
12110 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12112 /* Remove empty group section from linker output. */
12113 remove_section
= TRUE
;
12115 if (remove_section
)
12117 o
->flags
|= SEC_EXCLUDE
;
12118 bfd_section_list_remove (abfd
, o
);
12119 abfd
->section_count
--;
12120 sections_removed
= TRUE
;
12123 if (sections_removed
)
12124 _bfd_fix_excluded_sec_syms (abfd
, info
);
12126 /* Count up the number of relocations we will output for each output
12127 section, so that we know the sizes of the reloc sections. We
12128 also figure out some maximum sizes. */
12129 max_contents_size
= 0;
12130 max_external_reloc_size
= 0;
12131 max_internal_reloc_count
= 0;
12133 max_sym_shndx_count
= 0;
12135 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12137 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12138 o
->reloc_count
= 0;
12140 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12142 unsigned int reloc_count
= 0;
12143 unsigned int additional_reloc_count
= 0;
12144 struct bfd_elf_section_data
*esdi
= NULL
;
12146 if (p
->type
== bfd_section_reloc_link_order
12147 || p
->type
== bfd_symbol_reloc_link_order
)
12149 else if (p
->type
== bfd_indirect_link_order
)
12153 sec
= p
->u
.indirect
.section
;
12155 /* Mark all sections which are to be included in the
12156 link. This will normally be every section. We need
12157 to do this so that we can identify any sections which
12158 the linker has decided to not include. */
12159 sec
->linker_mark
= TRUE
;
12161 if (sec
->flags
& SEC_MERGE
)
12164 if (sec
->rawsize
> max_contents_size
)
12165 max_contents_size
= sec
->rawsize
;
12166 if (sec
->size
> max_contents_size
)
12167 max_contents_size
= sec
->size
;
12169 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12170 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12174 /* We are interested in just local symbols, not all
12176 if (elf_bad_symtab (sec
->owner
))
12177 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12178 / bed
->s
->sizeof_sym
);
12180 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12182 if (sym_count
> max_sym_count
)
12183 max_sym_count
= sym_count
;
12185 if (sym_count
> max_sym_shndx_count
12186 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12187 max_sym_shndx_count
= sym_count
;
12189 if (esdo
->this_hdr
.sh_type
== SHT_REL
12190 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12191 /* Some backends use reloc_count in relocation sections
12192 to count particular types of relocs. Of course,
12193 reloc sections themselves can't have relocations. */
12195 else if (emit_relocs
)
12197 reloc_count
= sec
->reloc_count
;
12198 if (bed
->elf_backend_count_additional_relocs
)
12201 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12202 additional_reloc_count
+= c
;
12205 else if (bed
->elf_backend_count_relocs
)
12206 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12208 esdi
= elf_section_data (sec
);
12210 if ((sec
->flags
& SEC_RELOC
) != 0)
12212 size_t ext_size
= 0;
12214 if (esdi
->rel
.hdr
!= NULL
)
12215 ext_size
= esdi
->rel
.hdr
->sh_size
;
12216 if (esdi
->rela
.hdr
!= NULL
)
12217 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12219 if (ext_size
> max_external_reloc_size
)
12220 max_external_reloc_size
= ext_size
;
12221 if (sec
->reloc_count
> max_internal_reloc_count
)
12222 max_internal_reloc_count
= sec
->reloc_count
;
12227 if (reloc_count
== 0)
12230 reloc_count
+= additional_reloc_count
;
12231 o
->reloc_count
+= reloc_count
;
12233 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12237 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12238 esdo
->rel
.count
+= additional_reloc_count
;
12240 if (esdi
->rela
.hdr
)
12242 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12243 esdo
->rela
.count
+= additional_reloc_count
;
12249 esdo
->rela
.count
+= reloc_count
;
12251 esdo
->rel
.count
+= reloc_count
;
12255 if (o
->reloc_count
> 0)
12256 o
->flags
|= SEC_RELOC
;
12259 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12260 set it (this is probably a bug) and if it is set
12261 assign_section_numbers will create a reloc section. */
12262 o
->flags
&=~ SEC_RELOC
;
12265 /* If the SEC_ALLOC flag is not set, force the section VMA to
12266 zero. This is done in elf_fake_sections as well, but forcing
12267 the VMA to 0 here will ensure that relocs against these
12268 sections are handled correctly. */
12269 if ((o
->flags
& SEC_ALLOC
) == 0
12270 && ! o
->user_set_vma
)
12274 if (! bfd_link_relocatable (info
) && merged
)
12275 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12277 /* Figure out the file positions for everything but the symbol table
12278 and the relocs. We set symcount to force assign_section_numbers
12279 to create a symbol table. */
12280 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12281 BFD_ASSERT (! abfd
->output_has_begun
);
12282 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12285 /* Set sizes, and assign file positions for reloc sections. */
12286 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12288 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12289 if ((o
->flags
& SEC_RELOC
) != 0)
12292 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12296 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12300 /* _bfd_elf_compute_section_file_positions makes temporary use
12301 of target_index. Reset it. */
12302 o
->target_index
= 0;
12304 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12305 to count upwards while actually outputting the relocations. */
12306 esdo
->rel
.count
= 0;
12307 esdo
->rela
.count
= 0;
12309 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12310 && !bfd_section_is_ctf (o
))
12312 /* Cache the section contents so that they can be compressed
12313 later. Use bfd_malloc since it will be freed by
12314 bfd_compress_section_contents. */
12315 unsigned char *contents
= esdo
->this_hdr
.contents
;
12316 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12319 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12320 if (contents
== NULL
)
12322 esdo
->this_hdr
.contents
= contents
;
12326 /* We have now assigned file positions for all the sections except .symtab,
12327 .strtab, and non-loaded reloc and compressed debugging sections. We start
12328 the .symtab section at the current file position, and write directly to it.
12329 We build the .strtab section in memory. */
12330 abfd
->symcount
= 0;
12331 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12332 /* sh_name is set in prep_headers. */
12333 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12334 /* sh_flags, sh_addr and sh_size all start off zero. */
12335 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12336 /* sh_link is set in assign_section_numbers. */
12337 /* sh_info is set below. */
12338 /* sh_offset is set just below. */
12339 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12341 if (max_sym_count
< 20)
12342 max_sym_count
= 20;
12343 htab
->strtabsize
= max_sym_count
;
12344 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12345 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12346 if (htab
->strtab
== NULL
)
12348 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12350 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12351 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12353 if (info
->strip
!= strip_all
|| emit_relocs
)
12355 file_ptr off
= elf_next_file_pos (abfd
);
12357 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
12359 /* Note that at this point elf_next_file_pos (abfd) is
12360 incorrect. We do not yet know the size of the .symtab section.
12361 We correct next_file_pos below, after we do know the size. */
12363 /* Start writing out the symbol table. The first symbol is always a
12365 elfsym
.st_value
= 0;
12366 elfsym
.st_size
= 0;
12367 elfsym
.st_info
= 0;
12368 elfsym
.st_other
= 0;
12369 elfsym
.st_shndx
= SHN_UNDEF
;
12370 elfsym
.st_target_internal
= 0;
12371 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12372 bfd_und_section_ptr
, NULL
) != 1)
12375 /* Output a symbol for each section if asked or they are used for
12376 relocs. These symbols usually have no names. We store the
12377 index of each one in the index field of the section, so that
12378 we can find it again when outputting relocs. */
12380 if (bfd_keep_unused_section_symbols (abfd
) || emit_relocs
)
12382 bfd_boolean name_local_sections
12383 = (bed
->elf_backend_name_local_section_symbols
12384 && bed
->elf_backend_name_local_section_symbols (abfd
));
12385 const char *name
= NULL
;
12387 elfsym
.st_size
= 0;
12388 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12389 elfsym
.st_other
= 0;
12390 elfsym
.st_value
= 0;
12391 elfsym
.st_target_internal
= 0;
12392 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12394 o
= bfd_section_from_elf_index (abfd
, i
);
12397 o
->target_index
= bfd_get_symcount (abfd
);
12398 elfsym
.st_shndx
= i
;
12399 if (!bfd_link_relocatable (info
))
12400 elfsym
.st_value
= o
->vma
;
12401 if (name_local_sections
)
12403 if (elf_link_output_symstrtab (&flinfo
, name
, &elfsym
, o
,
12411 /* On some targets like Irix 5 the symbol split between local and global
12412 ones recorded in the sh_info field needs to be done between section
12413 and all other symbols. */
12414 if (bed
->elf_backend_elfsym_local_is_section
12415 && bed
->elf_backend_elfsym_local_is_section (abfd
))
12416 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12418 /* Allocate some memory to hold information read in from the input
12420 if (max_contents_size
!= 0)
12422 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12423 if (flinfo
.contents
== NULL
)
12427 if (max_external_reloc_size
!= 0)
12429 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12430 if (flinfo
.external_relocs
== NULL
)
12434 if (max_internal_reloc_count
!= 0)
12436 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12437 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12438 if (flinfo
.internal_relocs
== NULL
)
12442 if (max_sym_count
!= 0)
12444 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12445 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12446 if (flinfo
.external_syms
== NULL
)
12449 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12450 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12451 if (flinfo
.internal_syms
== NULL
)
12454 amt
= max_sym_count
* sizeof (long);
12455 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12456 if (flinfo
.indices
== NULL
)
12459 amt
= max_sym_count
* sizeof (asection
*);
12460 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12461 if (flinfo
.sections
== NULL
)
12465 if (max_sym_shndx_count
!= 0)
12467 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12468 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12469 if (flinfo
.locsym_shndx
== NULL
)
12475 bfd_vma base
, end
= 0; /* Both bytes. */
12478 for (sec
= htab
->tls_sec
;
12479 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12482 bfd_size_type size
= sec
->size
;
12483 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12486 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12488 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12491 size
= ord
->offset
* opb
+ ord
->size
;
12493 end
= sec
->vma
+ size
/ opb
;
12495 base
= htab
->tls_sec
->vma
;
12496 /* Only align end of TLS section if static TLS doesn't have special
12497 alignment requirements. */
12498 if (bed
->static_tls_alignment
== 1)
12499 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12500 htab
->tls_size
= end
- base
;
12503 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12506 /* Since ELF permits relocations to be against local symbols, we
12507 must have the local symbols available when we do the relocations.
12508 Since we would rather only read the local symbols once, and we
12509 would rather not keep them in memory, we handle all the
12510 relocations for a single input file at the same time.
12512 Unfortunately, there is no way to know the total number of local
12513 symbols until we have seen all of them, and the local symbol
12514 indices precede the global symbol indices. This means that when
12515 we are generating relocatable output, and we see a reloc against
12516 a global symbol, we can not know the symbol index until we have
12517 finished examining all the local symbols to see which ones we are
12518 going to output. To deal with this, we keep the relocations in
12519 memory, and don't output them until the end of the link. This is
12520 an unfortunate waste of memory, but I don't see a good way around
12521 it. Fortunately, it only happens when performing a relocatable
12522 link, which is not the common case. FIXME: If keep_memory is set
12523 we could write the relocs out and then read them again; I don't
12524 know how bad the memory loss will be. */
12526 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12527 sub
->output_has_begun
= FALSE
;
12528 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12530 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12532 if (p
->type
== bfd_indirect_link_order
12533 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12534 == bfd_target_elf_flavour
)
12535 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12537 if (! sub
->output_has_begun
)
12539 if (! elf_link_input_bfd (&flinfo
, sub
))
12541 sub
->output_has_begun
= TRUE
;
12544 else if (p
->type
== bfd_section_reloc_link_order
12545 || p
->type
== bfd_symbol_reloc_link_order
)
12547 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12552 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12554 if (p
->type
== bfd_indirect_link_order
12555 && (bfd_get_flavour (sub
)
12556 == bfd_target_elf_flavour
)
12557 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12558 != bed
->s
->elfclass
))
12560 const char *iclass
, *oclass
;
12562 switch (bed
->s
->elfclass
)
12564 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12565 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12566 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12570 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12572 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12573 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12574 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12578 bfd_set_error (bfd_error_wrong_format
);
12580 /* xgettext:c-format */
12581 (_("%pB: file class %s incompatible with %s"),
12582 sub
, iclass
, oclass
);
12591 /* Free symbol buffer if needed. */
12592 if (!info
->reduce_memory_overheads
)
12594 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12595 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12597 free (elf_tdata (sub
)->symbuf
);
12598 elf_tdata (sub
)->symbuf
= NULL
;
12604 /* Output any global symbols that got converted to local in a
12605 version script or due to symbol visibility. We do this in a
12606 separate step since ELF requires all local symbols to appear
12607 prior to any global symbols. FIXME: We should only do this if
12608 some global symbols were, in fact, converted to become local.
12609 FIXME: Will this work correctly with the Irix 5 linker? */
12610 eoinfo
.failed
= FALSE
;
12611 eoinfo
.flinfo
= &flinfo
;
12612 eoinfo
.localsyms
= TRUE
;
12613 eoinfo
.file_sym_done
= FALSE
;
12614 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12618 goto return_local_hash_table
;
12621 /* If backend needs to output some local symbols not present in the hash
12622 table, do it now. */
12623 if (bed
->elf_backend_output_arch_local_syms
12624 && (info
->strip
!= strip_all
|| emit_relocs
))
12626 typedef int (*out_sym_func
)
12627 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12628 struct elf_link_hash_entry
*);
12630 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12631 (abfd
, info
, &flinfo
,
12632 (out_sym_func
) elf_link_output_symstrtab
)))
12635 goto return_local_hash_table
;
12639 /* That wrote out all the local symbols. Finish up the symbol table
12640 with the global symbols. Even if we want to strip everything we
12641 can, we still need to deal with those global symbols that got
12642 converted to local in a version script. */
12644 /* The sh_info field records the index of the first non local symbol. */
12645 if (!symtab_hdr
->sh_info
)
12646 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12649 && htab
->dynsym
!= NULL
12650 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12652 Elf_Internal_Sym sym
;
12653 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12655 o
= htab
->dynsym
->output_section
;
12656 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12658 /* Write out the section symbols for the output sections. */
12659 if (bfd_link_pic (info
)
12660 || htab
->is_relocatable_executable
)
12666 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12668 sym
.st_target_internal
= 0;
12670 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12676 dynindx
= elf_section_data (s
)->dynindx
;
12679 indx
= elf_section_data (s
)->this_idx
;
12680 BFD_ASSERT (indx
> 0);
12681 sym
.st_shndx
= indx
;
12682 if (! check_dynsym (abfd
, &sym
))
12685 goto return_local_hash_table
;
12687 sym
.st_value
= s
->vma
;
12688 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12690 /* Inform the linker of the addition of this symbol. */
12692 if (info
->callbacks
->ctf_new_dynsym
)
12693 info
->callbacks
->ctf_new_dynsym (dynindx
, &sym
);
12695 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12699 /* Write out the local dynsyms. */
12700 if (htab
->dynlocal
)
12702 struct elf_link_local_dynamic_entry
*e
;
12703 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12708 /* Copy the internal symbol and turn off visibility.
12709 Note that we saved a word of storage and overwrote
12710 the original st_name with the dynstr_index. */
12712 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12713 sym
.st_shndx
= SHN_UNDEF
;
12715 s
= bfd_section_from_elf_index (e
->input_bfd
,
12718 && s
->output_section
!= NULL
12719 && elf_section_data (s
->output_section
) != NULL
)
12722 elf_section_data (s
->output_section
)->this_idx
;
12723 if (! check_dynsym (abfd
, &sym
))
12726 goto return_local_hash_table
;
12728 sym
.st_value
= (s
->output_section
->vma
12730 + e
->isym
.st_value
);
12733 /* Inform the linker of the addition of this symbol. */
12735 if (info
->callbacks
->ctf_new_dynsym
)
12736 info
->callbacks
->ctf_new_dynsym (e
->dynindx
, &sym
);
12738 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12739 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12744 /* We get the global symbols from the hash table. */
12745 eoinfo
.failed
= FALSE
;
12746 eoinfo
.localsyms
= FALSE
;
12747 eoinfo
.flinfo
= &flinfo
;
12748 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12752 goto return_local_hash_table
;
12755 /* If backend needs to output some symbols not present in the hash
12756 table, do it now. */
12757 if (bed
->elf_backend_output_arch_syms
12758 && (info
->strip
!= strip_all
|| emit_relocs
))
12760 typedef int (*out_sym_func
)
12761 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12762 struct elf_link_hash_entry
*);
12764 if (! ((*bed
->elf_backend_output_arch_syms
)
12765 (abfd
, info
, &flinfo
,
12766 (out_sym_func
) elf_link_output_symstrtab
)))
12769 goto return_local_hash_table
;
12773 /* Finalize the .strtab section. */
12774 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12776 /* Swap out the .strtab section. */
12777 if (!elf_link_swap_symbols_out (&flinfo
))
12780 goto return_local_hash_table
;
12783 /* Now we know the size of the symtab section. */
12784 if (bfd_get_symcount (abfd
) > 0)
12786 /* Finish up and write out the symbol string table (.strtab)
12788 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12789 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12791 if (elf_symtab_shndx_list (abfd
))
12793 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12795 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12797 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12798 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12799 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12800 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12801 symtab_shndx_hdr
->sh_size
= amt
;
12803 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12806 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12807 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12810 goto return_local_hash_table
;
12815 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12816 /* sh_name was set in prep_headers. */
12817 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12818 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12819 symstrtab_hdr
->sh_addr
= 0;
12820 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12821 symstrtab_hdr
->sh_entsize
= 0;
12822 symstrtab_hdr
->sh_link
= 0;
12823 symstrtab_hdr
->sh_info
= 0;
12824 /* sh_offset is set just below. */
12825 symstrtab_hdr
->sh_addralign
= 1;
12827 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12829 elf_next_file_pos (abfd
) = off
;
12831 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12832 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12835 goto return_local_hash_table
;
12839 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12841 _bfd_error_handler (_("%pB: failed to generate import library"),
12842 info
->out_implib_bfd
);
12844 goto return_local_hash_table
;
12847 /* Adjust the relocs to have the correct symbol indices. */
12848 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12850 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12853 if ((o
->flags
& SEC_RELOC
) == 0)
12856 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12857 if (esdo
->rel
.hdr
!= NULL
12858 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12861 goto return_local_hash_table
;
12863 if (esdo
->rela
.hdr
!= NULL
12864 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12867 goto return_local_hash_table
;
12870 /* Set the reloc_count field to 0 to prevent write_relocs from
12871 trying to swap the relocs out itself. */
12872 o
->reloc_count
= 0;
12875 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12876 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12878 /* If we are linking against a dynamic object, or generating a
12879 shared library, finish up the dynamic linking information. */
12882 bfd_byte
*dyncon
, *dynconend
;
12884 /* Fix up .dynamic entries. */
12885 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12886 BFD_ASSERT (o
!= NULL
);
12888 dyncon
= o
->contents
;
12889 dynconend
= o
->contents
+ o
->size
;
12890 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12892 Elf_Internal_Dyn dyn
;
12895 bfd_size_type sh_size
;
12898 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12905 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12907 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12909 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12910 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12913 dyn
.d_un
.d_val
= relativecount
;
12920 name
= info
->init_function
;
12923 name
= info
->fini_function
;
12926 struct elf_link_hash_entry
*h
;
12928 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
12930 && (h
->root
.type
== bfd_link_hash_defined
12931 || h
->root
.type
== bfd_link_hash_defweak
))
12933 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12934 o
= h
->root
.u
.def
.section
;
12935 if (o
->output_section
!= NULL
)
12936 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12937 + o
->output_offset
);
12940 /* The symbol is imported from another shared
12941 library and does not apply to this one. */
12942 dyn
.d_un
.d_ptr
= 0;
12949 case DT_PREINIT_ARRAYSZ
:
12950 name
= ".preinit_array";
12952 case DT_INIT_ARRAYSZ
:
12953 name
= ".init_array";
12955 case DT_FINI_ARRAYSZ
:
12956 name
= ".fini_array";
12958 o
= bfd_get_section_by_name (abfd
, name
);
12962 (_("could not find section %s"), name
);
12967 (_("warning: %s section has zero size"), name
);
12968 dyn
.d_un
.d_val
= o
->size
;
12971 case DT_PREINIT_ARRAY
:
12972 name
= ".preinit_array";
12974 case DT_INIT_ARRAY
:
12975 name
= ".init_array";
12977 case DT_FINI_ARRAY
:
12978 name
= ".fini_array";
12980 o
= bfd_get_section_by_name (abfd
, name
);
12987 name
= ".gnu.hash";
12996 name
= ".gnu.version_d";
12999 name
= ".gnu.version_r";
13002 name
= ".gnu.version";
13004 o
= bfd_get_linker_section (dynobj
, name
);
13006 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
13009 (_("could not find section %s"), name
);
13012 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
13015 (_("warning: section '%s' is being made into a note"), name
);
13016 bfd_set_error (bfd_error_nonrepresentable_section
);
13019 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
13026 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
13032 for (i
= 1; i
< elf_numsections (abfd
); i
++)
13034 Elf_Internal_Shdr
*hdr
;
13036 hdr
= elf_elfsections (abfd
)[i
];
13037 if (hdr
->sh_type
== type
13038 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
13040 sh_size
+= hdr
->sh_size
;
13042 || sh_addr
> hdr
->sh_addr
)
13043 sh_addr
= hdr
->sh_addr
;
13047 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
13049 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
13051 /* Don't count procedure linkage table relocs in the
13052 overall reloc count. */
13053 sh_size
-= htab
->srelplt
->size
;
13055 /* If the size is zero, make the address zero too.
13056 This is to avoid a glibc bug. If the backend
13057 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
13058 zero, then we'll put DT_RELA at the end of
13059 DT_JMPREL. glibc will interpret the end of
13060 DT_RELA matching the end of DT_JMPREL as the
13061 case where DT_RELA includes DT_JMPREL, and for
13062 LD_BIND_NOW will decide that processing DT_RELA
13063 will process the PLT relocs too. Net result:
13064 No PLT relocs applied. */
13067 /* If .rela.plt is the first .rela section, exclude
13068 it from DT_RELA. */
13069 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
13070 + htab
->srelplt
->output_offset
) * opb
)
13071 sh_addr
+= htab
->srelplt
->size
;
13074 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
13075 dyn
.d_un
.d_val
= sh_size
;
13077 dyn
.d_un
.d_ptr
= sh_addr
;
13080 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13084 /* If we have created any dynamic sections, then output them. */
13085 if (dynobj
!= NULL
)
13087 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
13090 /* Check for DT_TEXTREL (late, in case the backend removes it). */
13091 if (bfd_link_textrel_check (info
)
13092 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
13094 bfd_byte
*dyncon
, *dynconend
;
13096 dyncon
= o
->contents
;
13097 dynconend
= o
->contents
+ o
->size
;
13098 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13100 Elf_Internal_Dyn dyn
;
13102 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13104 if (dyn
.d_tag
== DT_TEXTREL
)
13106 if (info
->textrel_check
== textrel_check_error
)
13107 info
->callbacks
->einfo
13108 (_("%P%X: read-only segment has dynamic relocations\n"));
13109 else if (bfd_link_dll (info
))
13110 info
->callbacks
->einfo
13111 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
13113 info
->callbacks
->einfo
13114 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
13120 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
13122 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
13124 || o
->output_section
== bfd_abs_section_ptr
)
13126 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
13128 /* At this point, we are only interested in sections
13129 created by _bfd_elf_link_create_dynamic_sections. */
13132 if (htab
->stab_info
.stabstr
== o
)
13134 if (htab
->eh_info
.hdr_sec
== o
)
13136 if (strcmp (o
->name
, ".dynstr") != 0)
13138 bfd_size_type octets
= ((file_ptr
) o
->output_offset
13139 * bfd_octets_per_byte (abfd
, o
));
13140 if (!bfd_set_section_contents (abfd
, o
->output_section
,
13141 o
->contents
, octets
, o
->size
))
13146 /* The contents of the .dynstr section are actually in a
13150 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
13151 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
13152 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13158 if (!info
->resolve_section_groups
)
13160 bfd_boolean failed
= FALSE
;
13162 BFD_ASSERT (bfd_link_relocatable (info
));
13163 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13168 /* If we have optimized stabs strings, output them. */
13169 if (htab
->stab_info
.stabstr
!= NULL
)
13171 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13175 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13178 if (info
->callbacks
->emit_ctf
)
13179 info
->callbacks
->emit_ctf ();
13181 elf_final_link_free (abfd
, &flinfo
);
13185 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13186 if (contents
== NULL
)
13188 /* Bail out and fail. */
13190 goto return_local_hash_table
;
13192 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13193 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13197 return_local_hash_table
:
13198 if (info
->unique_symbol
)
13199 bfd_hash_table_free (&flinfo
.local_hash_table
);
13203 elf_final_link_free (abfd
, &flinfo
);
13205 goto return_local_hash_table
;
13208 /* Initialize COOKIE for input bfd ABFD. */
13211 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13212 struct bfd_link_info
*info
, bfd
*abfd
)
13214 Elf_Internal_Shdr
*symtab_hdr
;
13215 const struct elf_backend_data
*bed
;
13217 bed
= get_elf_backend_data (abfd
);
13218 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13220 cookie
->abfd
= abfd
;
13221 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13222 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13223 if (cookie
->bad_symtab
)
13225 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13226 cookie
->extsymoff
= 0;
13230 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13231 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13234 if (bed
->s
->arch_size
== 32)
13235 cookie
->r_sym_shift
= 8;
13237 cookie
->r_sym_shift
= 32;
13239 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13240 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13242 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13243 cookie
->locsymcount
, 0,
13245 if (cookie
->locsyms
== NULL
)
13247 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13250 if (info
->keep_memory
)
13251 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13256 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13259 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13261 Elf_Internal_Shdr
*symtab_hdr
;
13263 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13264 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13265 free (cookie
->locsyms
);
13268 /* Initialize the relocation information in COOKIE for input section SEC
13269 of input bfd ABFD. */
13272 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13273 struct bfd_link_info
*info
, bfd
*abfd
,
13276 if (sec
->reloc_count
== 0)
13278 cookie
->rels
= NULL
;
13279 cookie
->relend
= NULL
;
13283 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13284 info
->keep_memory
);
13285 if (cookie
->rels
== NULL
)
13287 cookie
->rel
= cookie
->rels
;
13288 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13290 cookie
->rel
= cookie
->rels
;
13294 /* Free the memory allocated by init_reloc_cookie_rels,
13298 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13301 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13302 free (cookie
->rels
);
13305 /* Initialize the whole of COOKIE for input section SEC. */
13308 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13309 struct bfd_link_info
*info
,
13312 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13314 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13319 fini_reloc_cookie (cookie
, sec
->owner
);
13324 /* Free the memory allocated by init_reloc_cookie_for_section,
13328 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13331 fini_reloc_cookie_rels (cookie
, sec
);
13332 fini_reloc_cookie (cookie
, sec
->owner
);
13335 /* Garbage collect unused sections. */
13337 /* Default gc_mark_hook. */
13340 _bfd_elf_gc_mark_hook (asection
*sec
,
13341 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13342 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13343 struct elf_link_hash_entry
*h
,
13344 Elf_Internal_Sym
*sym
)
13348 switch (h
->root
.type
)
13350 case bfd_link_hash_defined
:
13351 case bfd_link_hash_defweak
:
13352 return h
->root
.u
.def
.section
;
13354 case bfd_link_hash_common
:
13355 return h
->root
.u
.c
.p
->section
;
13362 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13367 /* Return the debug definition section. */
13370 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13371 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13372 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13373 struct elf_link_hash_entry
*h
,
13374 Elf_Internal_Sym
*sym
)
13378 /* Return the global debug definition section. */
13379 if ((h
->root
.type
== bfd_link_hash_defined
13380 || h
->root
.type
== bfd_link_hash_defweak
)
13381 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13382 return h
->root
.u
.def
.section
;
13386 /* Return the local debug definition section. */
13387 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13389 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13396 /* COOKIE->rel describes a relocation against section SEC, which is
13397 a section we've decided to keep. Return the section that contains
13398 the relocation symbol, or NULL if no section contains it. */
13401 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13402 elf_gc_mark_hook_fn gc_mark_hook
,
13403 struct elf_reloc_cookie
*cookie
,
13404 bfd_boolean
*start_stop
)
13406 unsigned long r_symndx
;
13407 struct elf_link_hash_entry
*h
, *hw
;
13409 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13410 if (r_symndx
== STN_UNDEF
)
13413 if (r_symndx
>= cookie
->locsymcount
13414 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13416 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13419 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13423 while (h
->root
.type
== bfd_link_hash_indirect
13424 || h
->root
.type
== bfd_link_hash_warning
)
13425 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13427 /* Keep all aliases of the symbol too. If an object symbol
13428 needs to be copied into .dynbss then all of its aliases
13429 should be present as dynamic symbols, not just the one used
13430 on the copy relocation. */
13432 while (hw
->is_weakalias
)
13438 if (start_stop
!= NULL
)
13440 /* To work around a glibc bug, mark XXX input sections
13441 when there is a reference to __start_XXX or __stop_XXX
13445 asection
*s
= h
->u2
.start_stop_section
;
13446 *start_stop
= !s
->gc_mark
;
13451 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13454 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13455 &cookie
->locsyms
[r_symndx
]);
13458 /* COOKIE->rel describes a relocation against section SEC, which is
13459 a section we've decided to keep. Mark the section that contains
13460 the relocation symbol. */
13463 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13465 elf_gc_mark_hook_fn gc_mark_hook
,
13466 struct elf_reloc_cookie
*cookie
)
13469 bfd_boolean start_stop
= FALSE
;
13471 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13472 while (rsec
!= NULL
)
13474 if (!rsec
->gc_mark
)
13476 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13477 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13479 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13484 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13489 /* The mark phase of garbage collection. For a given section, mark
13490 it and any sections in this section's group, and all the sections
13491 which define symbols to which it refers. */
13494 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13496 elf_gc_mark_hook_fn gc_mark_hook
)
13499 asection
*group_sec
, *eh_frame
;
13503 /* Mark all the sections in the group. */
13504 group_sec
= elf_section_data (sec
)->next_in_group
;
13505 if (group_sec
&& !group_sec
->gc_mark
)
13506 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13509 /* Look through the section relocs. */
13511 eh_frame
= elf_eh_frame_section (sec
->owner
);
13512 if ((sec
->flags
& SEC_RELOC
) != 0
13513 && sec
->reloc_count
> 0
13514 && sec
!= eh_frame
)
13516 struct elf_reloc_cookie cookie
;
13518 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13522 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13523 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13528 fini_reloc_cookie_for_section (&cookie
, sec
);
13532 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13534 struct elf_reloc_cookie cookie
;
13536 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13540 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13541 gc_mark_hook
, &cookie
))
13543 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13547 eh_frame
= elf_section_eh_frame_entry (sec
);
13548 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13549 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13555 /* Scan and mark sections in a special or debug section group. */
13558 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13560 /* Point to first section of section group. */
13562 /* Used to iterate the section group. */
13565 bfd_boolean is_special_grp
= TRUE
;
13566 bfd_boolean is_debug_grp
= TRUE
;
13568 /* First scan to see if group contains any section other than debug
13569 and special section. */
13570 ssec
= msec
= elf_next_in_group (grp
);
13573 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13574 is_debug_grp
= FALSE
;
13576 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13577 is_special_grp
= FALSE
;
13579 msec
= elf_next_in_group (msec
);
13581 while (msec
!= ssec
);
13583 /* If this is a pure debug section group or pure special section group,
13584 keep all sections in this group. */
13585 if (is_debug_grp
|| is_special_grp
)
13590 msec
= elf_next_in_group (msec
);
13592 while (msec
!= ssec
);
13596 /* Keep debug and special sections. */
13599 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13600 elf_gc_mark_hook_fn mark_hook
)
13604 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13607 bfd_boolean some_kept
;
13608 bfd_boolean debug_frag_seen
;
13609 bfd_boolean has_kept_debug_info
;
13611 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13613 isec
= ibfd
->sections
;
13614 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13617 /* Ensure all linker created sections are kept,
13618 see if any other section is already marked,
13619 and note if we have any fragmented debug sections. */
13620 debug_frag_seen
= some_kept
= has_kept_debug_info
= FALSE
;
13621 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13623 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13625 else if (isec
->gc_mark
13626 && (isec
->flags
& SEC_ALLOC
) != 0
13627 && elf_section_type (isec
) != SHT_NOTE
)
13631 /* Since all sections, except for backend specific ones,
13632 have been garbage collected, call mark_hook on this
13633 section if any of its linked-to sections is marked. */
13634 asection
*linked_to_sec
= elf_linked_to_section (isec
);
13635 for (; linked_to_sec
!= NULL
;
13636 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13637 if (linked_to_sec
->gc_mark
)
13639 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13645 if (!debug_frag_seen
13646 && (isec
->flags
& SEC_DEBUGGING
)
13647 && CONST_STRNEQ (isec
->name
, ".debug_line."))
13648 debug_frag_seen
= TRUE
;
13649 else if (strcmp (bfd_section_name (isec
),
13650 "__patchable_function_entries") == 0
13651 && elf_linked_to_section (isec
) == NULL
)
13652 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13653 "need linked-to section "
13654 "for --gc-sections\n"),
13655 isec
->owner
, isec
);
13658 /* If no non-note alloc section in this file will be kept, then
13659 we can toss out the debug and special sections. */
13663 /* Keep debug and special sections like .comment when they are
13664 not part of a group. Also keep section groups that contain
13665 just debug sections or special sections. NB: Sections with
13666 linked-to section has been handled above. */
13667 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13669 if ((isec
->flags
& SEC_GROUP
) != 0)
13670 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13671 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13672 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13673 && elf_next_in_group (isec
) == NULL
13674 && elf_linked_to_section (isec
) == NULL
)
13676 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13677 has_kept_debug_info
= TRUE
;
13680 /* Look for CODE sections which are going to be discarded,
13681 and find and discard any fragmented debug sections which
13682 are associated with that code section. */
13683 if (debug_frag_seen
)
13684 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13685 if ((isec
->flags
& SEC_CODE
) != 0
13686 && isec
->gc_mark
== 0)
13691 ilen
= strlen (isec
->name
);
13693 /* Association is determined by the name of the debug
13694 section containing the name of the code section as
13695 a suffix. For example .debug_line.text.foo is a
13696 debug section associated with .text.foo. */
13697 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13701 if (dsec
->gc_mark
== 0
13702 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13705 dlen
= strlen (dsec
->name
);
13708 && strncmp (dsec
->name
+ (dlen
- ilen
),
13709 isec
->name
, ilen
) == 0)
13714 /* Mark debug sections referenced by kept debug sections. */
13715 if (has_kept_debug_info
)
13716 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13718 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13719 if (!_bfd_elf_gc_mark (info
, isec
,
13720 elf_gc_mark_debug_section
))
13727 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13730 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13732 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13736 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13737 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13738 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13741 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13744 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13746 /* When any section in a section group is kept, we keep all
13747 sections in the section group. If the first member of
13748 the section group is excluded, we will also exclude the
13750 if (o
->flags
& SEC_GROUP
)
13752 asection
*first
= elf_next_in_group (o
);
13753 o
->gc_mark
= first
->gc_mark
;
13759 /* Skip sweeping sections already excluded. */
13760 if (o
->flags
& SEC_EXCLUDE
)
13763 /* Since this is early in the link process, it is simple
13764 to remove a section from the output. */
13765 o
->flags
|= SEC_EXCLUDE
;
13767 if (info
->print_gc_sections
&& o
->size
!= 0)
13768 /* xgettext:c-format */
13769 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13777 /* Propagate collected vtable information. This is called through
13778 elf_link_hash_traverse. */
13781 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13783 /* Those that are not vtables. */
13785 || h
->u2
.vtable
== NULL
13786 || h
->u2
.vtable
->parent
== NULL
)
13789 /* Those vtables that do not have parents, we cannot merge. */
13790 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13793 /* If we've already been done, exit. */
13794 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13797 /* Make sure the parent's table is up to date. */
13798 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13800 if (h
->u2
.vtable
->used
== NULL
)
13802 /* None of this table's entries were referenced. Re-use the
13804 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13805 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13810 bfd_boolean
*cu
, *pu
;
13812 /* Or the parent's entries into ours. */
13813 cu
= h
->u2
.vtable
->used
;
13815 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13818 const struct elf_backend_data
*bed
;
13819 unsigned int log_file_align
;
13821 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13822 log_file_align
= bed
->s
->log_file_align
;
13823 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13838 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13841 bfd_vma hstart
, hend
;
13842 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13843 const struct elf_backend_data
*bed
;
13844 unsigned int log_file_align
;
13846 /* Take care of both those symbols that do not describe vtables as
13847 well as those that are not loaded. */
13849 || h
->u2
.vtable
== NULL
13850 || h
->u2
.vtable
->parent
== NULL
)
13853 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13854 || h
->root
.type
== bfd_link_hash_defweak
);
13856 sec
= h
->root
.u
.def
.section
;
13857 hstart
= h
->root
.u
.def
.value
;
13858 hend
= hstart
+ h
->size
;
13860 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
13862 return *(bfd_boolean
*) okp
= FALSE
;
13863 bed
= get_elf_backend_data (sec
->owner
);
13864 log_file_align
= bed
->s
->log_file_align
;
13866 relend
= relstart
+ sec
->reloc_count
;
13868 for (rel
= relstart
; rel
< relend
; ++rel
)
13869 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13871 /* If the entry is in use, do nothing. */
13872 if (h
->u2
.vtable
->used
13873 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13875 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13876 if (h
->u2
.vtable
->used
[entry
])
13879 /* Otherwise, kill it. */
13880 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13886 /* Mark sections containing dynamically referenced symbols. When
13887 building shared libraries, we must assume that any visible symbol is
13891 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13893 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13894 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13896 if ((h
->root
.type
== bfd_link_hash_defined
13897 || h
->root
.type
== bfd_link_hash_defweak
)
13898 && ((h
->ref_dynamic
&& !h
->forced_local
)
13899 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13900 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13901 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13902 && (!bfd_link_executable (info
)
13903 || info
->gc_keep_exported
13904 || info
->export_dynamic
13907 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13908 && (h
->versioned
>= versioned
13909 || !bfd_hide_sym_by_version (info
->version_info
,
13910 h
->root
.root
.string
)))))
13911 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13916 /* Keep all sections containing symbols undefined on the command-line,
13917 and the section containing the entry symbol. */
13920 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13922 struct bfd_sym_chain
*sym
;
13924 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13926 struct elf_link_hash_entry
*h
;
13928 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13929 FALSE
, FALSE
, FALSE
);
13932 && (h
->root
.type
== bfd_link_hash_defined
13933 || h
->root
.type
== bfd_link_hash_defweak
)
13934 && !bfd_is_const_section (h
->root
.u
.def
.section
))
13935 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13940 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13941 struct bfd_link_info
*info
)
13943 bfd
*ibfd
= info
->input_bfds
;
13945 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13948 struct elf_reloc_cookie cookie
;
13950 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13952 sec
= ibfd
->sections
;
13953 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13956 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
13959 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
13961 if (CONST_STRNEQ (bfd_section_name (sec
), ".eh_frame_entry")
13962 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
13964 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
13965 fini_reloc_cookie_rels (&cookie
, sec
);
13972 /* Do mark and sweep of unused sections. */
13975 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
13977 bfd_boolean ok
= TRUE
;
13979 elf_gc_mark_hook_fn gc_mark_hook
;
13980 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13981 struct elf_link_hash_table
*htab
;
13983 if (!bed
->can_gc_sections
13984 || !is_elf_hash_table (info
->hash
))
13986 _bfd_error_handler(_("warning: gc-sections option ignored"));
13990 bed
->gc_keep (info
);
13991 htab
= elf_hash_table (info
);
13993 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
13994 at the .eh_frame section if we can mark the FDEs individually. */
13995 for (sub
= info
->input_bfds
;
13996 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
13997 sub
= sub
->link
.next
)
14000 struct elf_reloc_cookie cookie
;
14002 sec
= sub
->sections
;
14003 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14005 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
14006 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
14008 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
14009 if (elf_section_data (sec
)->sec_info
14010 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
14011 elf_eh_frame_section (sub
) = sec
;
14012 fini_reloc_cookie_for_section (&cookie
, sec
);
14013 sec
= bfd_get_next_section_by_name (NULL
, sec
);
14017 /* Apply transitive closure to the vtable entry usage info. */
14018 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
14022 /* Kill the vtable relocations that were not used. */
14023 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
14027 /* Mark dynamically referenced symbols. */
14028 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
14029 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
14031 /* Grovel through relocs to find out who stays ... */
14032 gc_mark_hook
= bed
->gc_mark_hook
;
14033 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14037 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14038 || elf_object_id (sub
) != elf_hash_table_id (htab
)
14039 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14043 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14046 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
14047 Also treat note sections as a root, if the section is not part
14048 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
14049 well as FINI_ARRAY sections for ld -r. */
14050 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14052 && (o
->flags
& SEC_EXCLUDE
) == 0
14053 && ((o
->flags
& SEC_KEEP
) != 0
14054 || (bfd_link_relocatable (info
)
14055 && ((elf_section_data (o
)->this_hdr
.sh_type
14056 == SHT_PREINIT_ARRAY
)
14057 || (elf_section_data (o
)->this_hdr
.sh_type
14059 || (elf_section_data (o
)->this_hdr
.sh_type
14060 == SHT_FINI_ARRAY
)))
14061 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
14062 && elf_next_in_group (o
) == NULL
14063 && elf_linked_to_section (o
) == NULL
)
14064 || ((elf_tdata (sub
)->has_gnu_osabi
& elf_gnu_osabi_retain
)
14065 && (elf_section_flags (o
) & SHF_GNU_RETAIN
))))
14067 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
14072 /* Allow the backend to mark additional target specific sections. */
14073 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
14075 /* ... and mark SEC_EXCLUDE for those that go. */
14076 return elf_gc_sweep (abfd
, info
);
14079 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
14082 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
14084 struct elf_link_hash_entry
*h
,
14087 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
14088 struct elf_link_hash_entry
**search
, *child
;
14089 size_t extsymcount
;
14090 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14092 /* The sh_info field of the symtab header tells us where the
14093 external symbols start. We don't care about the local symbols at
14095 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
14096 if (!elf_bad_symtab (abfd
))
14097 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
14099 sym_hashes
= elf_sym_hashes (abfd
);
14100 sym_hashes_end
= sym_hashes
+ extsymcount
;
14102 /* Hunt down the child symbol, which is in this section at the same
14103 offset as the relocation. */
14104 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
14106 if ((child
= *search
) != NULL
14107 && (child
->root
.type
== bfd_link_hash_defined
14108 || child
->root
.type
== bfd_link_hash_defweak
)
14109 && child
->root
.u
.def
.section
== sec
14110 && child
->root
.u
.def
.value
== offset
)
14114 /* xgettext:c-format */
14115 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
14116 abfd
, sec
, (uint64_t) offset
);
14117 bfd_set_error (bfd_error_invalid_operation
);
14121 if (!child
->u2
.vtable
)
14123 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14124 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
14125 if (!child
->u2
.vtable
)
14130 /* This *should* only be the absolute section. It could potentially
14131 be that someone has defined a non-global vtable though, which
14132 would be bad. It isn't worth paging in the local symbols to be
14133 sure though; that case should simply be handled by the assembler. */
14135 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
14138 child
->u2
.vtable
->parent
= h
;
14143 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
14146 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
14147 struct elf_link_hash_entry
*h
,
14150 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14151 unsigned int log_file_align
= bed
->s
->log_file_align
;
14155 /* xgettext:c-format */
14156 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
14158 bfd_set_error (bfd_error_bad_value
);
14164 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14165 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14170 if (addend
>= h
->u2
.vtable
->size
)
14172 size_t size
, bytes
, file_align
;
14173 bfd_boolean
*ptr
= h
->u2
.vtable
->used
;
14175 /* While the symbol is undefined, we have to be prepared to handle
14177 file_align
= 1 << log_file_align
;
14178 if (h
->root
.type
== bfd_link_hash_undefined
)
14179 size
= addend
+ file_align
;
14183 if (addend
>= size
)
14185 /* Oops! We've got a reference past the defined end of
14186 the table. This is probably a bug -- shall we warn? */
14187 size
= addend
+ file_align
;
14190 size
= (size
+ file_align
- 1) & -file_align
;
14192 /* Allocate one extra entry for use as a "done" flag for the
14193 consolidation pass. */
14194 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
14198 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
14204 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14205 * sizeof (bfd_boolean
));
14206 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14210 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
14215 /* And arrange for that done flag to be at index -1. */
14216 h
->u2
.vtable
->used
= ptr
+ 1;
14217 h
->u2
.vtable
->size
= size
;
14220 h
->u2
.vtable
->used
[addend
>> log_file_align
] = TRUE
;
14225 /* Map an ELF section header flag to its corresponding string. */
14229 flagword flag_value
;
14230 } elf_flags_to_name_table
;
14232 static const elf_flags_to_name_table elf_flags_to_names
[] =
14234 { "SHF_WRITE", SHF_WRITE
},
14235 { "SHF_ALLOC", SHF_ALLOC
},
14236 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14237 { "SHF_MERGE", SHF_MERGE
},
14238 { "SHF_STRINGS", SHF_STRINGS
},
14239 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14240 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14241 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14242 { "SHF_GROUP", SHF_GROUP
},
14243 { "SHF_TLS", SHF_TLS
},
14244 { "SHF_MASKOS", SHF_MASKOS
},
14245 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14248 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14250 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14251 struct flag_info
*flaginfo
,
14254 const bfd_vma sh_flags
= elf_section_flags (section
);
14256 if (!flaginfo
->flags_initialized
)
14258 bfd
*obfd
= info
->output_bfd
;
14259 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14260 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14262 int without_hex
= 0;
14264 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14267 flagword (*lookup
) (char *);
14269 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14270 if (lookup
!= NULL
)
14272 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14276 if (tf
->with
== with_flags
)
14277 with_hex
|= hexval
;
14278 else if (tf
->with
== without_flags
)
14279 without_hex
|= hexval
;
14284 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14286 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14288 if (tf
->with
== with_flags
)
14289 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14290 else if (tf
->with
== without_flags
)
14291 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14298 info
->callbacks
->einfo
14299 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14303 flaginfo
->flags_initialized
= TRUE
;
14304 flaginfo
->only_with_flags
|= with_hex
;
14305 flaginfo
->not_with_flags
|= without_hex
;
14308 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14311 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14317 struct alloc_got_off_arg
{
14319 struct bfd_link_info
*info
;
14322 /* We need a special top-level link routine to convert got reference counts
14323 to real got offsets. */
14326 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14328 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14329 bfd
*obfd
= gofarg
->info
->output_bfd
;
14330 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14332 if (h
->got
.refcount
> 0)
14334 h
->got
.offset
= gofarg
->gotoff
;
14335 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14338 h
->got
.offset
= (bfd_vma
) -1;
14343 /* And an accompanying bit to work out final got entry offsets once
14344 we're done. Should be called from final_link. */
14347 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14348 struct bfd_link_info
*info
)
14351 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14353 struct alloc_got_off_arg gofarg
;
14355 BFD_ASSERT (abfd
== info
->output_bfd
);
14357 if (! is_elf_hash_table (info
->hash
))
14360 /* The GOT offset is relative to the .got section, but the GOT header is
14361 put into the .got.plt section, if the backend uses it. */
14362 if (bed
->want_got_plt
)
14365 gotoff
= bed
->got_header_size
;
14367 /* Do the local .got entries first. */
14368 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14370 bfd_signed_vma
*local_got
;
14371 size_t j
, locsymcount
;
14372 Elf_Internal_Shdr
*symtab_hdr
;
14374 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14377 local_got
= elf_local_got_refcounts (i
);
14381 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14382 if (elf_bad_symtab (i
))
14383 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14385 locsymcount
= symtab_hdr
->sh_info
;
14387 for (j
= 0; j
< locsymcount
; ++j
)
14389 if (local_got
[j
] > 0)
14391 local_got
[j
] = gotoff
;
14392 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14395 local_got
[j
] = (bfd_vma
) -1;
14399 /* Then the global .got entries. .plt refcounts are handled by
14400 adjust_dynamic_symbol */
14401 gofarg
.gotoff
= gotoff
;
14402 gofarg
.info
= info
;
14403 elf_link_hash_traverse (elf_hash_table (info
),
14404 elf_gc_allocate_got_offsets
,
14409 /* Many folk need no more in the way of final link than this, once
14410 got entry reference counting is enabled. */
14413 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14415 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14418 /* Invoke the regular ELF backend linker to do all the work. */
14419 return bfd_elf_final_link (abfd
, info
);
14423 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14425 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14427 if (rcookie
->bad_symtab
)
14428 rcookie
->rel
= rcookie
->rels
;
14430 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14432 unsigned long r_symndx
;
14434 if (! rcookie
->bad_symtab
)
14435 if (rcookie
->rel
->r_offset
> offset
)
14437 if (rcookie
->rel
->r_offset
!= offset
)
14440 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14441 if (r_symndx
== STN_UNDEF
)
14444 if (r_symndx
>= rcookie
->locsymcount
14445 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14447 struct elf_link_hash_entry
*h
;
14449 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14451 while (h
->root
.type
== bfd_link_hash_indirect
14452 || h
->root
.type
== bfd_link_hash_warning
)
14453 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14455 if ((h
->root
.type
== bfd_link_hash_defined
14456 || h
->root
.type
== bfd_link_hash_defweak
)
14457 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14458 || h
->root
.u
.def
.section
->kept_section
!= NULL
14459 || discarded_section (h
->root
.u
.def
.section
)))
14464 /* It's not a relocation against a global symbol,
14465 but it could be a relocation against a local
14466 symbol for a discarded section. */
14468 Elf_Internal_Sym
*isym
;
14470 /* Need to: get the symbol; get the section. */
14471 isym
= &rcookie
->locsyms
[r_symndx
];
14472 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14474 && (isec
->kept_section
!= NULL
14475 || discarded_section (isec
)))
14483 /* Discard unneeded references to discarded sections.
14484 Returns -1 on error, 1 if any section's size was changed, 0 if
14485 nothing changed. This function assumes that the relocations are in
14486 sorted order, which is true for all known assemblers. */
14489 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14491 struct elf_reloc_cookie cookie
;
14496 if (info
->traditional_format
14497 || !is_elf_hash_table (info
->hash
))
14500 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14505 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14508 || i
->reloc_count
== 0
14509 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14513 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14516 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14519 if (_bfd_discard_section_stabs (abfd
, i
,
14520 elf_section_data (i
)->sec_info
,
14521 bfd_elf_reloc_symbol_deleted_p
,
14525 fini_reloc_cookie_for_section (&cookie
, i
);
14530 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14531 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14535 int eh_changed
= 0;
14536 unsigned int eh_alignment
; /* Octets. */
14538 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14544 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14547 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14550 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14551 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14552 bfd_elf_reloc_symbol_deleted_p
,
14556 if (i
->size
!= i
->rawsize
)
14560 fini_reloc_cookie_for_section (&cookie
, i
);
14563 eh_alignment
= ((1 << o
->alignment_power
)
14564 * bfd_octets_per_byte (output_bfd
, o
));
14565 /* Skip over zero terminator, and prevent empty sections from
14566 adding alignment padding at the end. */
14567 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14569 i
->flags
|= SEC_EXCLUDE
;
14570 else if (i
->size
> 4)
14572 /* The last non-empty eh_frame section doesn't need padding. */
14575 /* Any prior sections must pad the last FDE out to the output
14576 section alignment. Otherwise we might have zero padding
14577 between sections, which would be seen as a terminator. */
14578 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14580 /* All but the last zero terminator should have been removed. */
14585 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14586 if (i
->size
!= size
)
14594 elf_link_hash_traverse (elf_hash_table (info
),
14595 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14598 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14600 const struct elf_backend_data
*bed
;
14603 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14605 s
= abfd
->sections
;
14606 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14609 bed
= get_elf_backend_data (abfd
);
14611 if (bed
->elf_backend_discard_info
!= NULL
)
14613 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14616 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14619 fini_reloc_cookie (&cookie
, abfd
);
14623 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14624 _bfd_elf_end_eh_frame_parsing (info
);
14626 if (info
->eh_frame_hdr_type
14627 && !bfd_link_relocatable (info
)
14628 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14635 _bfd_elf_section_already_linked (bfd
*abfd
,
14637 struct bfd_link_info
*info
)
14640 const char *name
, *key
;
14641 struct bfd_section_already_linked
*l
;
14642 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14644 if (sec
->output_section
== bfd_abs_section_ptr
)
14647 flags
= sec
->flags
;
14649 /* Return if it isn't a linkonce section. A comdat group section
14650 also has SEC_LINK_ONCE set. */
14651 if ((flags
& SEC_LINK_ONCE
) == 0)
14654 /* Don't put group member sections on our list of already linked
14655 sections. They are handled as a group via their group section. */
14656 if (elf_sec_group (sec
) != NULL
)
14659 /* For a SHT_GROUP section, use the group signature as the key. */
14661 if ((flags
& SEC_GROUP
) != 0
14662 && elf_next_in_group (sec
) != NULL
14663 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14664 key
= elf_group_name (elf_next_in_group (sec
));
14667 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14668 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
14669 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14672 /* Must be a user linkonce section that doesn't follow gcc's
14673 naming convention. In this case we won't be matching
14674 single member groups. */
14678 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14680 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14682 /* We may have 2 different types of sections on the list: group
14683 sections with a signature of <key> (<key> is some string),
14684 and linkonce sections named .gnu.linkonce.<type>.<key>.
14685 Match like sections. LTO plugin sections are an exception.
14686 They are always named .gnu.linkonce.t.<key> and match either
14687 type of section. */
14688 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14689 && ((flags
& SEC_GROUP
) != 0
14690 || strcmp (name
, l
->sec
->name
) == 0))
14691 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0
14692 || (sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14694 /* The section has already been linked. See if we should
14695 issue a warning. */
14696 if (!_bfd_handle_already_linked (sec
, l
, info
))
14699 if (flags
& SEC_GROUP
)
14701 asection
*first
= elf_next_in_group (sec
);
14702 asection
*s
= first
;
14706 s
->output_section
= bfd_abs_section_ptr
;
14707 /* Record which group discards it. */
14708 s
->kept_section
= l
->sec
;
14709 s
= elf_next_in_group (s
);
14710 /* These lists are circular. */
14720 /* A single member comdat group section may be discarded by a
14721 linkonce section and vice versa. */
14722 if ((flags
& SEC_GROUP
) != 0)
14724 asection
*first
= elf_next_in_group (sec
);
14726 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14727 /* Check this single member group against linkonce sections. */
14728 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14729 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14730 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14732 first
->output_section
= bfd_abs_section_ptr
;
14733 first
->kept_section
= l
->sec
;
14734 sec
->output_section
= bfd_abs_section_ptr
;
14739 /* Check this linkonce section against single member groups. */
14740 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14741 if (l
->sec
->flags
& SEC_GROUP
)
14743 asection
*first
= elf_next_in_group (l
->sec
);
14746 && elf_next_in_group (first
) == first
14747 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14749 sec
->output_section
= bfd_abs_section_ptr
;
14750 sec
->kept_section
= first
;
14755 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14756 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14757 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14758 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14759 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14760 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14761 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14762 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14763 The reverse order cannot happen as there is never a bfd with only the
14764 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14765 matter as here were are looking only for cross-bfd sections. */
14767 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
14768 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14769 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14770 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
14772 if (abfd
!= l
->sec
->owner
)
14773 sec
->output_section
= bfd_abs_section_ptr
;
14777 /* This is the first section with this name. Record it. */
14778 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14779 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14780 return sec
->output_section
== bfd_abs_section_ptr
;
14784 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14786 return sym
->st_shndx
== SHN_COMMON
;
14790 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14796 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14798 return bfd_com_section_ptr
;
14802 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14803 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14804 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14805 bfd
*ibfd ATTRIBUTE_UNUSED
,
14806 unsigned long symndx ATTRIBUTE_UNUSED
)
14808 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14809 return bed
->s
->arch_size
/ 8;
14812 /* Routines to support the creation of dynamic relocs. */
14814 /* Returns the name of the dynamic reloc section associated with SEC. */
14816 static const char *
14817 get_dynamic_reloc_section_name (bfd
* abfd
,
14819 bfd_boolean is_rela
)
14822 const char *old_name
= bfd_section_name (sec
);
14823 const char *prefix
= is_rela
? ".rela" : ".rel";
14825 if (old_name
== NULL
)
14828 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14829 sprintf (name
, "%s%s", prefix
, old_name
);
14834 /* Returns the dynamic reloc section associated with SEC.
14835 If necessary compute the name of the dynamic reloc section based
14836 on SEC's name (looked up in ABFD's string table) and the setting
14840 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
14842 bfd_boolean is_rela
)
14844 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14846 if (reloc_sec
== NULL
)
14848 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14852 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14854 if (reloc_sec
!= NULL
)
14855 elf_section_data (sec
)->sreloc
= reloc_sec
;
14862 /* Returns the dynamic reloc section associated with SEC. If the
14863 section does not exist it is created and attached to the DYNOBJ
14864 bfd and stored in the SRELOC field of SEC's elf_section_data
14867 ALIGNMENT is the alignment for the newly created section and
14868 IS_RELA defines whether the name should be .rela.<SEC's name>
14869 or .rel.<SEC's name>. The section name is looked up in the
14870 string table associated with ABFD. */
14873 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14875 unsigned int alignment
,
14877 bfd_boolean is_rela
)
14879 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14881 if (reloc_sec
== NULL
)
14883 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14888 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14890 if (reloc_sec
== NULL
)
14892 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14893 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14894 if ((sec
->flags
& SEC_ALLOC
) != 0)
14895 flags
|= SEC_ALLOC
| SEC_LOAD
;
14897 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14898 if (reloc_sec
!= NULL
)
14900 /* _bfd_elf_get_sec_type_attr chooses a section type by
14901 name. Override as it may be wrong, eg. for a user
14902 section named "auto" we'll get ".relauto" which is
14903 seen to be a .rela section. */
14904 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14905 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14910 elf_section_data (sec
)->sreloc
= reloc_sec
;
14916 /* Copy the ELF symbol type and other attributes for a linker script
14917 assignment from HSRC to HDEST. Generally this should be treated as
14918 if we found a strong non-dynamic definition for HDEST (except that
14919 ld ignores multiple definition errors). */
14921 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14922 struct bfd_link_hash_entry
*hdest
,
14923 struct bfd_link_hash_entry
*hsrc
)
14925 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14926 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14927 Elf_Internal_Sym isym
;
14929 ehdest
->type
= ehsrc
->type
;
14930 ehdest
->target_internal
= ehsrc
->target_internal
;
14932 isym
.st_other
= ehsrc
->other
;
14933 elf_merge_st_other (abfd
, ehdest
, isym
.st_other
, NULL
, TRUE
, FALSE
);
14936 /* Append a RELA relocation REL to section S in BFD. */
14939 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14941 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14942 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14943 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14944 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14947 /* Append a REL relocation REL to section S in BFD. */
14950 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14952 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14953 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14954 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
14955 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
14958 /* Define __start, __stop, .startof. or .sizeof. symbol. */
14960 struct bfd_link_hash_entry
*
14961 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
14962 const char *symbol
, asection
*sec
)
14964 struct elf_link_hash_entry
*h
;
14966 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
14967 FALSE
, FALSE
, TRUE
);
14968 /* NB: Common symbols will be turned into definition later. */
14970 && (h
->root
.type
== bfd_link_hash_undefined
14971 || h
->root
.type
== bfd_link_hash_undefweak
14972 || ((h
->ref_regular
|| h
->def_dynamic
)
14974 && h
->root
.type
!= bfd_link_hash_common
)))
14976 bfd_boolean was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
14977 h
->verinfo
.verdef
= NULL
;
14978 h
->root
.type
= bfd_link_hash_defined
;
14979 h
->root
.u
.def
.section
= sec
;
14980 h
->root
.u
.def
.value
= 0;
14981 h
->def_regular
= 1;
14982 h
->def_dynamic
= 0;
14984 h
->u2
.start_stop_section
= sec
;
14985 if (symbol
[0] == '.')
14987 /* .startof. and .sizeof. symbols are local. */
14988 const struct elf_backend_data
*bed
;
14989 bed
= get_elf_backend_data (info
->output_bfd
);
14990 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
14994 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
14995 h
->other
= ((h
->other
& ~ELF_ST_VISIBILITY (-1))
14996 | info
->start_stop_visibility
);
14998 bfd_elf_link_record_dynamic_symbol (info
, h
);
15005 /* Find dynamic relocs for H that apply to read-only sections. */
15008 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
15010 struct elf_dyn_relocs
*p
;
15012 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
15014 asection
*s
= p
->sec
->output_section
;
15016 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
15022 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
15023 read-only sections. */
15026 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
15030 if (h
->root
.type
== bfd_link_hash_indirect
)
15033 sec
= _bfd_elf_readonly_dynrelocs (h
);
15036 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
15038 info
->flags
|= DF_TEXTREL
;
15039 /* xgettext:c-format */
15040 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
15041 "in read-only section `%pA'\n"),
15042 sec
->owner
, h
->root
.root
.string
, sec
);
15044 if (bfd_link_textrel_check (info
))
15045 /* xgettext:c-format */
15046 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
15047 "in read-only section `%pA'\n"),
15048 sec
->owner
, h
->root
.root
.string
, sec
);
15050 /* Not an error, just cut short the traversal. */
15056 /* Add dynamic tags. */
15059 _bfd_elf_add_dynamic_tags (bfd
*output_bfd
, struct bfd_link_info
*info
,
15060 bfd_boolean need_dynamic_reloc
)
15062 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
15064 if (htab
->dynamic_sections_created
)
15066 /* Add some entries to the .dynamic section. We fill in the
15067 values later, in finish_dynamic_sections, but we must add
15068 the entries now so that we get the correct size for the
15069 .dynamic section. The DT_DEBUG entry is filled in by the
15070 dynamic linker and used by the debugger. */
15071 #define add_dynamic_entry(TAG, VAL) \
15072 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
15074 const struct elf_backend_data
*bed
15075 = get_elf_backend_data (output_bfd
);
15077 if (bfd_link_executable (info
))
15079 if (!add_dynamic_entry (DT_DEBUG
, 0))
15083 if (htab
->dt_pltgot_required
|| htab
->splt
->size
!= 0)
15085 /* DT_PLTGOT is used by prelink even if there is no PLT
15087 if (!add_dynamic_entry (DT_PLTGOT
, 0))
15091 if (htab
->dt_jmprel_required
|| htab
->srelplt
->size
!= 0)
15093 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
15094 || !add_dynamic_entry (DT_PLTREL
,
15095 (bed
->rela_plts_and_copies_p
15096 ? DT_RELA
: DT_REL
))
15097 || !add_dynamic_entry (DT_JMPREL
, 0))
15101 if (htab
->tlsdesc_plt
15102 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
15103 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
15106 if (need_dynamic_reloc
)
15108 if (bed
->rela_plts_and_copies_p
)
15110 if (!add_dynamic_entry (DT_RELA
, 0)
15111 || !add_dynamic_entry (DT_RELASZ
, 0)
15112 || !add_dynamic_entry (DT_RELAENT
,
15113 bed
->s
->sizeof_rela
))
15118 if (!add_dynamic_entry (DT_REL
, 0)
15119 || !add_dynamic_entry (DT_RELSZ
, 0)
15120 || !add_dynamic_entry (DT_RELENT
,
15121 bed
->s
->sizeof_rel
))
15125 /* If any dynamic relocs apply to a read-only section,
15126 then we need a DT_TEXTREL entry. */
15127 if ((info
->flags
& DF_TEXTREL
) == 0)
15128 elf_link_hash_traverse (htab
, _bfd_elf_maybe_set_textrel
,
15131 if ((info
->flags
& DF_TEXTREL
) != 0)
15133 if (htab
->ifunc_resolvers
)
15134 info
->callbacks
->einfo
15135 (_("%P: warning: GNU indirect functions with DT_TEXTREL "
15136 "may result in a segfault at runtime; recompile with %s\n"),
15137 bfd_link_dll (info
) ? "-fPIC" : "-fPIE");
15139 if (!add_dynamic_entry (DT_TEXTREL
, 0))
15144 #undef add_dynamic_entry