1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info
*info
;
39 struct bfd_elf_version_tree
*verdefs
;
43 /* This structure is used to pass information to
44 _bfd_elf_link_find_version_dependencies. */
46 struct elf_find_verdep_info
48 /* General link information. */
49 struct bfd_link_info
*info
;
50 /* The number of dependencies. */
52 /* Whether we had a failure. */
56 static bfd_boolean _bfd_elf_fix_symbol_flags
57 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
59 /* Define a symbol in a dynamic linkage section. */
61 struct elf_link_hash_entry
*
62 _bfd_elf_define_linkage_sym (bfd
*abfd
,
63 struct bfd_link_info
*info
,
67 struct elf_link_hash_entry
*h
;
68 struct bfd_link_hash_entry
*bh
;
69 const struct elf_backend_data
*bed
;
71 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
74 /* Zap symbol defined in an as-needed lib that wasn't linked.
75 This is a symptom of a larger problem: Absolute symbols
76 defined in shared libraries can't be overridden, because we
77 lose the link to the bfd which is via the symbol section. */
78 h
->root
.type
= bfd_link_hash_new
;
82 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
84 get_elf_backend_data (abfd
)->collect
,
87 h
= (struct elf_link_hash_entry
*) bh
;
90 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
92 bed
= get_elf_backend_data (abfd
);
93 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
98 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
102 struct elf_link_hash_entry
*h
;
103 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
106 /* This function may be called more than once. */
107 s
= bfd_get_section_by_name (abfd
, ".got");
108 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
111 switch (bed
->s
->arch_size
)
122 bfd_set_error (bfd_error_bad_value
);
126 flags
= bed
->dynamic_sec_flags
;
128 s
= bfd_make_section_with_flags (abfd
, ".got", flags
);
130 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
133 if (bed
->want_got_plt
)
135 s
= bfd_make_section_with_flags (abfd
, ".got.plt", flags
);
137 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
141 if (bed
->want_got_sym
)
143 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
144 (or .got.plt) section. We don't do this in the linker script
145 because we don't want to define the symbol if we are not creating
146 a global offset table. */
147 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_GLOBAL_OFFSET_TABLE_");
148 elf_hash_table (info
)->hgot
= h
;
153 /* The first bit of the global offset table is the header. */
154 s
->size
+= bed
->got_header_size
;
159 /* Create a strtab to hold the dynamic symbol names. */
161 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
163 struct elf_link_hash_table
*hash_table
;
165 hash_table
= elf_hash_table (info
);
166 if (hash_table
->dynobj
== NULL
)
167 hash_table
->dynobj
= abfd
;
169 if (hash_table
->dynstr
== NULL
)
171 hash_table
->dynstr
= _bfd_elf_strtab_init ();
172 if (hash_table
->dynstr
== NULL
)
178 /* Create some sections which will be filled in with dynamic linking
179 information. ABFD is an input file which requires dynamic sections
180 to be created. The dynamic sections take up virtual memory space
181 when the final executable is run, so we need to create them before
182 addresses are assigned to the output sections. We work out the
183 actual contents and size of these sections later. */
186 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
189 register asection
*s
;
190 const struct elf_backend_data
*bed
;
192 if (! is_elf_hash_table (info
->hash
))
195 if (elf_hash_table (info
)->dynamic_sections_created
)
198 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
201 abfd
= elf_hash_table (info
)->dynobj
;
202 bed
= get_elf_backend_data (abfd
);
204 flags
= bed
->dynamic_sec_flags
;
206 /* A dynamically linked executable has a .interp section, but a
207 shared library does not. */
208 if (info
->executable
)
210 s
= bfd_make_section_with_flags (abfd
, ".interp",
211 flags
| SEC_READONLY
);
216 /* Create sections to hold version informations. These are removed
217 if they are not needed. */
218 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_d",
219 flags
| SEC_READONLY
);
221 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
224 s
= bfd_make_section_with_flags (abfd
, ".gnu.version",
225 flags
| SEC_READONLY
);
227 || ! bfd_set_section_alignment (abfd
, s
, 1))
230 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_r",
231 flags
| SEC_READONLY
);
233 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
236 s
= bfd_make_section_with_flags (abfd
, ".dynsym",
237 flags
| SEC_READONLY
);
239 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
242 s
= bfd_make_section_with_flags (abfd
, ".dynstr",
243 flags
| SEC_READONLY
);
247 s
= bfd_make_section_with_flags (abfd
, ".dynamic", flags
);
249 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
252 /* The special symbol _DYNAMIC is always set to the start of the
253 .dynamic section. We could set _DYNAMIC in a linker script, but we
254 only want to define it if we are, in fact, creating a .dynamic
255 section. We don't want to define it if there is no .dynamic
256 section, since on some ELF platforms the start up code examines it
257 to decide how to initialize the process. */
258 if (!_bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC"))
263 s
= bfd_make_section_with_flags (abfd
, ".hash", flags
| SEC_READONLY
);
265 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
267 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
270 if (info
->emit_gnu_hash
)
272 s
= bfd_make_section_with_flags (abfd
, ".gnu.hash",
273 flags
| SEC_READONLY
);
275 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
277 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
278 4 32-bit words followed by variable count of 64-bit words, then
279 variable count of 32-bit words. */
280 if (bed
->s
->arch_size
== 64)
281 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
283 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
286 /* Let the backend create the rest of the sections. This lets the
287 backend set the right flags. The backend will normally create
288 the .got and .plt sections. */
289 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
292 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
297 /* Create dynamic sections when linking against a dynamic object. */
300 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
302 flagword flags
, pltflags
;
303 struct elf_link_hash_entry
*h
;
305 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
307 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
308 .rel[a].bss sections. */
309 flags
= bed
->dynamic_sec_flags
;
312 if (bed
->plt_not_loaded
)
313 /* We do not clear SEC_ALLOC here because we still want the OS to
314 allocate space for the section; it's just that there's nothing
315 to read in from the object file. */
316 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
318 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
319 if (bed
->plt_readonly
)
320 pltflags
|= SEC_READONLY
;
322 s
= bfd_make_section_with_flags (abfd
, ".plt", pltflags
);
324 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
327 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
329 if (bed
->want_plt_sym
)
331 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
332 "_PROCEDURE_LINKAGE_TABLE_");
333 elf_hash_table (info
)->hplt
= h
;
338 s
= bfd_make_section_with_flags (abfd
,
339 (bed
->rela_plts_and_copies_p
340 ? ".rela.plt" : ".rel.plt"),
341 flags
| SEC_READONLY
);
343 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
346 if (! _bfd_elf_create_got_section (abfd
, info
))
349 if (bed
->want_dynbss
)
351 /* The .dynbss section is a place to put symbols which are defined
352 by dynamic objects, are referenced by regular objects, and are
353 not functions. We must allocate space for them in the process
354 image and use a R_*_COPY reloc to tell the dynamic linker to
355 initialize them at run time. The linker script puts the .dynbss
356 section into the .bss section of the final image. */
357 s
= bfd_make_section_with_flags (abfd
, ".dynbss",
359 | SEC_LINKER_CREATED
));
363 /* The .rel[a].bss section holds copy relocs. This section is not
364 normally needed. We need to create it here, though, so that the
365 linker will map it to an output section. We can't just create it
366 only if we need it, because we will not know whether we need it
367 until we have seen all the input files, and the first time the
368 main linker code calls BFD after examining all the input files
369 (size_dynamic_sections) the input sections have already been
370 mapped to the output sections. If the section turns out not to
371 be needed, we can discard it later. We will never need this
372 section when generating a shared object, since they do not use
376 s
= bfd_make_section_with_flags (abfd
,
377 (bed
->rela_plts_and_copies_p
378 ? ".rela.bss" : ".rel.bss"),
379 flags
| SEC_READONLY
);
381 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
389 /* Record a new dynamic symbol. We record the dynamic symbols as we
390 read the input files, since we need to have a list of all of them
391 before we can determine the final sizes of the output sections.
392 Note that we may actually call this function even though we are not
393 going to output any dynamic symbols; in some cases we know that a
394 symbol should be in the dynamic symbol table, but only if there is
398 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
399 struct elf_link_hash_entry
*h
)
401 if (h
->dynindx
== -1)
403 struct elf_strtab_hash
*dynstr
;
408 /* XXX: The ABI draft says the linker must turn hidden and
409 internal symbols into STB_LOCAL symbols when producing the
410 DSO. However, if ld.so honors st_other in the dynamic table,
411 this would not be necessary. */
412 switch (ELF_ST_VISIBILITY (h
->other
))
416 if (h
->root
.type
!= bfd_link_hash_undefined
417 && h
->root
.type
!= bfd_link_hash_undefweak
)
420 if (!elf_hash_table (info
)->is_relocatable_executable
)
428 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
429 ++elf_hash_table (info
)->dynsymcount
;
431 dynstr
= elf_hash_table (info
)->dynstr
;
434 /* Create a strtab to hold the dynamic symbol names. */
435 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
440 /* We don't put any version information in the dynamic string
442 name
= h
->root
.root
.string
;
443 p
= strchr (name
, ELF_VER_CHR
);
445 /* We know that the p points into writable memory. In fact,
446 there are only a few symbols that have read-only names, being
447 those like _GLOBAL_OFFSET_TABLE_ that are created specially
448 by the backends. Most symbols will have names pointing into
449 an ELF string table read from a file, or to objalloc memory. */
452 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
457 if (indx
== (bfd_size_type
) -1)
459 h
->dynstr_index
= indx
;
465 /* Mark a symbol dynamic. */
468 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
469 struct elf_link_hash_entry
*h
,
470 Elf_Internal_Sym
*sym
)
472 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
474 /* It may be called more than once on the same H. */
475 if(h
->dynamic
|| info
->relocatable
)
478 if ((info
->dynamic_data
479 && (h
->type
== STT_OBJECT
481 && ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
)))
483 && h
->root
.type
== bfd_link_hash_new
484 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
488 /* Record an assignment to a symbol made by a linker script. We need
489 this in case some dynamic object refers to this symbol. */
492 bfd_elf_record_link_assignment (bfd
*output_bfd
,
493 struct bfd_link_info
*info
,
498 struct elf_link_hash_entry
*h
, *hv
;
499 struct elf_link_hash_table
*htab
;
500 const struct elf_backend_data
*bed
;
502 if (!is_elf_hash_table (info
->hash
))
505 htab
= elf_hash_table (info
);
506 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
510 switch (h
->root
.type
)
512 case bfd_link_hash_defined
:
513 case bfd_link_hash_defweak
:
514 case bfd_link_hash_common
:
516 case bfd_link_hash_undefweak
:
517 case bfd_link_hash_undefined
:
518 /* Since we're defining the symbol, don't let it seem to have not
519 been defined. record_dynamic_symbol and size_dynamic_sections
520 may depend on this. */
521 h
->root
.type
= bfd_link_hash_new
;
522 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
523 bfd_link_repair_undef_list (&htab
->root
);
525 case bfd_link_hash_new
:
526 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
529 case bfd_link_hash_indirect
:
530 /* We had a versioned symbol in a dynamic library. We make the
531 the versioned symbol point to this one. */
532 bed
= get_elf_backend_data (output_bfd
);
534 while (hv
->root
.type
== bfd_link_hash_indirect
535 || hv
->root
.type
== bfd_link_hash_warning
)
536 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
537 /* We don't need to update h->root.u since linker will set them
539 h
->root
.type
= bfd_link_hash_undefined
;
540 hv
->root
.type
= bfd_link_hash_indirect
;
541 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
542 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
544 case bfd_link_hash_warning
:
549 /* If this symbol is being provided by the linker script, and it is
550 currently defined by a dynamic object, but not by a regular
551 object, then mark it as undefined so that the generic linker will
552 force the correct value. */
556 h
->root
.type
= bfd_link_hash_undefined
;
558 /* If this symbol is not being provided by the linker script, and it is
559 currently defined by a dynamic object, but not by a regular object,
560 then clear out any version information because the symbol will not be
561 associated with the dynamic object any more. */
565 h
->verinfo
.verdef
= NULL
;
569 if (provide
&& hidden
)
571 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
573 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
574 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
577 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
579 if (!info
->relocatable
581 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
582 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
588 || (info
->executable
&& elf_hash_table (info
)->is_relocatable_executable
))
591 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
594 /* If this is a weak defined symbol, and we know a corresponding
595 real symbol from the same dynamic object, make sure the real
596 symbol is also made into a dynamic symbol. */
597 if (h
->u
.weakdef
!= NULL
598 && h
->u
.weakdef
->dynindx
== -1)
600 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
608 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
609 success, and 2 on a failure caused by attempting to record a symbol
610 in a discarded section, eg. a discarded link-once section symbol. */
613 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
618 struct elf_link_local_dynamic_entry
*entry
;
619 struct elf_link_hash_table
*eht
;
620 struct elf_strtab_hash
*dynstr
;
621 unsigned long dynstr_index
;
623 Elf_External_Sym_Shndx eshndx
;
624 char esym
[sizeof (Elf64_External_Sym
)];
626 if (! is_elf_hash_table (info
->hash
))
629 /* See if the entry exists already. */
630 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
631 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
634 amt
= sizeof (*entry
);
635 entry
= bfd_alloc (input_bfd
, amt
);
639 /* Go find the symbol, so that we can find it's name. */
640 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
641 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
643 bfd_release (input_bfd
, entry
);
647 if (entry
->isym
.st_shndx
!= SHN_UNDEF
648 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
652 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
653 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
655 /* We can still bfd_release here as nothing has done another
656 bfd_alloc. We can't do this later in this function. */
657 bfd_release (input_bfd
, entry
);
662 name
= (bfd_elf_string_from_elf_section
663 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
664 entry
->isym
.st_name
));
666 dynstr
= elf_hash_table (info
)->dynstr
;
669 /* Create a strtab to hold the dynamic symbol names. */
670 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
675 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
676 if (dynstr_index
== (unsigned long) -1)
678 entry
->isym
.st_name
= dynstr_index
;
680 eht
= elf_hash_table (info
);
682 entry
->next
= eht
->dynlocal
;
683 eht
->dynlocal
= entry
;
684 entry
->input_bfd
= input_bfd
;
685 entry
->input_indx
= input_indx
;
688 /* Whatever binding the symbol had before, it's now local. */
690 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
692 /* The dynindx will be set at the end of size_dynamic_sections. */
697 /* Return the dynindex of a local dynamic symbol. */
700 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
704 struct elf_link_local_dynamic_entry
*e
;
706 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
707 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
712 /* This function is used to renumber the dynamic symbols, if some of
713 them are removed because they are marked as local. This is called
714 via elf_link_hash_traverse. */
717 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
720 size_t *count
= data
;
722 if (h
->root
.type
== bfd_link_hash_warning
)
723 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
728 if (h
->dynindx
!= -1)
729 h
->dynindx
= ++(*count
);
735 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
736 STB_LOCAL binding. */
739 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
742 size_t *count
= data
;
744 if (h
->root
.type
== bfd_link_hash_warning
)
745 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
747 if (!h
->forced_local
)
750 if (h
->dynindx
!= -1)
751 h
->dynindx
= ++(*count
);
756 /* Return true if the dynamic symbol for a given section should be
757 omitted when creating a shared library. */
759 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
760 struct bfd_link_info
*info
,
763 struct elf_link_hash_table
*htab
;
765 switch (elf_section_data (p
)->this_hdr
.sh_type
)
769 /* If sh_type is yet undecided, assume it could be
770 SHT_PROGBITS/SHT_NOBITS. */
772 htab
= elf_hash_table (info
);
773 if (p
== htab
->tls_sec
)
776 if (htab
->text_index_section
!= NULL
)
777 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
779 if (strcmp (p
->name
, ".got") == 0
780 || strcmp (p
->name
, ".got.plt") == 0
781 || strcmp (p
->name
, ".plt") == 0)
785 if (htab
->dynobj
!= NULL
786 && (ip
= bfd_get_section_by_name (htab
->dynobj
, p
->name
)) != NULL
787 && (ip
->flags
& SEC_LINKER_CREATED
)
788 && ip
->output_section
== p
)
793 /* There shouldn't be section relative relocations
794 against any other section. */
800 /* Assign dynsym indices. In a shared library we generate a section
801 symbol for each output section, which come first. Next come symbols
802 which have been forced to local binding. Then all of the back-end
803 allocated local dynamic syms, followed by the rest of the global
807 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
808 struct bfd_link_info
*info
,
809 unsigned long *section_sym_count
)
811 unsigned long dynsymcount
= 0;
813 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
815 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
817 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
818 if ((p
->flags
& SEC_EXCLUDE
) == 0
819 && (p
->flags
& SEC_ALLOC
) != 0
820 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
821 elf_section_data (p
)->dynindx
= ++dynsymcount
;
823 elf_section_data (p
)->dynindx
= 0;
825 *section_sym_count
= dynsymcount
;
827 elf_link_hash_traverse (elf_hash_table (info
),
828 elf_link_renumber_local_hash_table_dynsyms
,
831 if (elf_hash_table (info
)->dynlocal
)
833 struct elf_link_local_dynamic_entry
*p
;
834 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
835 p
->dynindx
= ++dynsymcount
;
838 elf_link_hash_traverse (elf_hash_table (info
),
839 elf_link_renumber_hash_table_dynsyms
,
842 /* There is an unused NULL entry at the head of the table which
843 we must account for in our count. Unless there weren't any
844 symbols, which means we'll have no table at all. */
845 if (dynsymcount
!= 0)
848 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
852 /* Merge st_other field. */
855 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
856 Elf_Internal_Sym
*isym
, bfd_boolean definition
,
859 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
861 /* If st_other has a processor-specific meaning, specific
862 code might be needed here. We never merge the visibility
863 attribute with the one from a dynamic object. */
864 if (bed
->elf_backend_merge_symbol_attribute
)
865 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
868 /* If this symbol has default visibility and the user has requested
869 we not re-export it, then mark it as hidden. */
873 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
874 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
875 isym
->st_other
= (STV_HIDDEN
876 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
878 if (!dynamic
&& ELF_ST_VISIBILITY (isym
->st_other
) != 0)
880 unsigned char hvis
, symvis
, other
, nvis
;
882 /* Only merge the visibility. Leave the remainder of the
883 st_other field to elf_backend_merge_symbol_attribute. */
884 other
= h
->other
& ~ELF_ST_VISIBILITY (-1);
886 /* Combine visibilities, using the most constraining one. */
887 hvis
= ELF_ST_VISIBILITY (h
->other
);
888 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
894 nvis
= hvis
< symvis
? hvis
: symvis
;
896 h
->other
= other
| nvis
;
900 /* This function is called when we want to define a new symbol. It
901 handles the various cases which arise when we find a definition in
902 a dynamic object, or when there is already a definition in a
903 dynamic object. The new symbol is described by NAME, SYM, PSEC,
904 and PVALUE. We set SYM_HASH to the hash table entry. We set
905 OVERRIDE if the old symbol is overriding a new definition. We set
906 TYPE_CHANGE_OK if it is OK for the type to change. We set
907 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
908 change, we mean that we shouldn't warn if the type or size does
909 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
910 object is overridden by a regular object. */
913 _bfd_elf_merge_symbol (bfd
*abfd
,
914 struct bfd_link_info
*info
,
916 Elf_Internal_Sym
*sym
,
919 unsigned int *pold_alignment
,
920 struct elf_link_hash_entry
**sym_hash
,
922 bfd_boolean
*override
,
923 bfd_boolean
*type_change_ok
,
924 bfd_boolean
*size_change_ok
)
926 asection
*sec
, *oldsec
;
927 struct elf_link_hash_entry
*h
;
928 struct elf_link_hash_entry
*flip
;
931 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
932 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
933 const struct elf_backend_data
*bed
;
939 bind
= ELF_ST_BIND (sym
->st_info
);
941 /* Silently discard TLS symbols from --just-syms. There's no way to
942 combine a static TLS block with a new TLS block for this executable. */
943 if (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
944 && sec
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
950 if (! bfd_is_und_section (sec
))
951 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
953 h
= ((struct elf_link_hash_entry
*)
954 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
959 bed
= get_elf_backend_data (abfd
);
961 /* This code is for coping with dynamic objects, and is only useful
962 if we are doing an ELF link. */
963 if (!(*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
966 /* For merging, we only care about real symbols. */
968 while (h
->root
.type
== bfd_link_hash_indirect
969 || h
->root
.type
== bfd_link_hash_warning
)
970 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
972 /* We have to check it for every instance since the first few may be
973 refereences and not all compilers emit symbol type for undefined
975 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
977 /* If we just created the symbol, mark it as being an ELF symbol.
978 Other than that, there is nothing to do--there is no merge issue
979 with a newly defined symbol--so we just return. */
981 if (h
->root
.type
== bfd_link_hash_new
)
987 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
990 switch (h
->root
.type
)
997 case bfd_link_hash_undefined
:
998 case bfd_link_hash_undefweak
:
999 oldbfd
= h
->root
.u
.undef
.abfd
;
1003 case bfd_link_hash_defined
:
1004 case bfd_link_hash_defweak
:
1005 oldbfd
= h
->root
.u
.def
.section
->owner
;
1006 oldsec
= h
->root
.u
.def
.section
;
1009 case bfd_link_hash_common
:
1010 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1011 oldsec
= h
->root
.u
.c
.p
->section
;
1015 /* In cases involving weak versioned symbols, we may wind up trying
1016 to merge a symbol with itself. Catch that here, to avoid the
1017 confusion that results if we try to override a symbol with
1018 itself. The additional tests catch cases like
1019 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1020 dynamic object, which we do want to handle here. */
1022 && ((abfd
->flags
& DYNAMIC
) == 0
1023 || !h
->def_regular
))
1026 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1027 respectively, is from a dynamic object. */
1029 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1033 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1034 else if (oldsec
!= NULL
)
1036 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1037 indices used by MIPS ELF. */
1038 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1041 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1042 respectively, appear to be a definition rather than reference. */
1044 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1046 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1047 && h
->root
.type
!= bfd_link_hash_undefweak
1048 && h
->root
.type
!= bfd_link_hash_common
);
1050 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1051 respectively, appear to be a function. */
1053 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1054 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1056 oldfunc
= (h
->type
!= STT_NOTYPE
1057 && bed
->is_function_type (h
->type
));
1059 /* When we try to create a default indirect symbol from the dynamic
1060 definition with the default version, we skip it if its type and
1061 the type of existing regular definition mismatch. We only do it
1062 if the existing regular definition won't be dynamic. */
1063 if (pold_alignment
== NULL
1065 && !info
->export_dynamic
1070 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
1071 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1072 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1073 && h
->type
!= STT_NOTYPE
1074 && !(newfunc
&& oldfunc
))
1080 /* Check TLS symbol. We don't check undefined symbol introduced by
1082 if ((ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
)
1083 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1087 bfd_boolean ntdef
, tdef
;
1088 asection
*ntsec
, *tsec
;
1090 if (h
->type
== STT_TLS
)
1110 (*_bfd_error_handler
)
1111 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1112 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1113 else if (!tdef
&& !ntdef
)
1114 (*_bfd_error_handler
)
1115 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1116 tbfd
, ntbfd
, h
->root
.root
.string
);
1118 (*_bfd_error_handler
)
1119 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1120 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1122 (*_bfd_error_handler
)
1123 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1124 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1126 bfd_set_error (bfd_error_bad_value
);
1130 /* We need to remember if a symbol has a definition in a dynamic
1131 object or is weak in all dynamic objects. Internal and hidden
1132 visibility will make it unavailable to dynamic objects. */
1133 if (newdyn
&& !h
->dynamic_def
)
1135 if (!bfd_is_und_section (sec
))
1139 /* Check if this symbol is weak in all dynamic objects. If it
1140 is the first time we see it in a dynamic object, we mark
1141 if it is weak. Otherwise, we clear it. */
1142 if (!h
->ref_dynamic
)
1144 if (bind
== STB_WEAK
)
1145 h
->dynamic_weak
= 1;
1147 else if (bind
!= STB_WEAK
)
1148 h
->dynamic_weak
= 0;
1152 /* If the old symbol has non-default visibility, we ignore the new
1153 definition from a dynamic object. */
1155 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1156 && !bfd_is_und_section (sec
))
1159 /* Make sure this symbol is dynamic. */
1161 /* A protected symbol has external availability. Make sure it is
1162 recorded as dynamic.
1164 FIXME: Should we check type and size for protected symbol? */
1165 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1166 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1171 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1174 /* If the new symbol with non-default visibility comes from a
1175 relocatable file and the old definition comes from a dynamic
1176 object, we remove the old definition. */
1177 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1179 /* Handle the case where the old dynamic definition is
1180 default versioned. We need to copy the symbol info from
1181 the symbol with default version to the normal one if it
1182 was referenced before. */
1185 const struct elf_backend_data
*bed
1186 = get_elf_backend_data (abfd
);
1187 struct elf_link_hash_entry
*vh
= *sym_hash
;
1188 vh
->root
.type
= h
->root
.type
;
1189 h
->root
.type
= bfd_link_hash_indirect
;
1190 (*bed
->elf_backend_copy_indirect_symbol
) (info
, vh
, h
);
1191 /* Protected symbols will override the dynamic definition
1192 with default version. */
1193 if (ELF_ST_VISIBILITY (sym
->st_other
) == STV_PROTECTED
)
1195 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) vh
;
1196 vh
->dynamic_def
= 1;
1197 vh
->ref_dynamic
= 1;
1201 h
->root
.type
= vh
->root
.type
;
1202 vh
->ref_dynamic
= 0;
1203 /* We have to hide it here since it was made dynamic
1204 global with extra bits when the symbol info was
1205 copied from the old dynamic definition. */
1206 (*bed
->elf_backend_hide_symbol
) (info
, vh
, TRUE
);
1214 if ((h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1215 && bfd_is_und_section (sec
))
1217 /* If the new symbol is undefined and the old symbol was
1218 also undefined before, we need to make sure
1219 _bfd_generic_link_add_one_symbol doesn't mess
1220 up the linker hash table undefs list. Since the old
1221 definition came from a dynamic object, it is still on the
1223 h
->root
.type
= bfd_link_hash_undefined
;
1224 h
->root
.u
.undef
.abfd
= abfd
;
1228 h
->root
.type
= bfd_link_hash_new
;
1229 h
->root
.u
.undef
.abfd
= NULL
;
1238 /* FIXME: Should we check type and size for protected symbol? */
1244 /* Differentiate strong and weak symbols. */
1245 newweak
= bind
== STB_WEAK
;
1246 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1247 || h
->root
.type
== bfd_link_hash_undefweak
);
1249 /* If a new weak symbol definition comes from a regular file and the
1250 old symbol comes from a dynamic library, we treat the new one as
1251 strong. Similarly, an old weak symbol definition from a regular
1252 file is treated as strong when the new symbol comes from a dynamic
1253 library. Further, an old weak symbol from a dynamic library is
1254 treated as strong if the new symbol is from a dynamic library.
1255 This reflects the way glibc's ld.so works.
1257 Do this before setting *type_change_ok or *size_change_ok so that
1258 we warn properly when dynamic library symbols are overridden. */
1260 if (newdef
&& !newdyn
&& olddyn
)
1262 if (olddef
&& newdyn
)
1265 /* Allow changes between different types of function symbol. */
1266 if (newfunc
&& oldfunc
)
1267 *type_change_ok
= TRUE
;
1269 /* It's OK to change the type if either the existing symbol or the
1270 new symbol is weak. A type change is also OK if the old symbol
1271 is undefined and the new symbol is defined. */
1276 && h
->root
.type
== bfd_link_hash_undefined
))
1277 *type_change_ok
= TRUE
;
1279 /* It's OK to change the size if either the existing symbol or the
1280 new symbol is weak, or if the old symbol is undefined. */
1283 || h
->root
.type
== bfd_link_hash_undefined
)
1284 *size_change_ok
= TRUE
;
1286 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1287 symbol, respectively, appears to be a common symbol in a dynamic
1288 object. If a symbol appears in an uninitialized section, and is
1289 not weak, and is not a function, then it may be a common symbol
1290 which was resolved when the dynamic object was created. We want
1291 to treat such symbols specially, because they raise special
1292 considerations when setting the symbol size: if the symbol
1293 appears as a common symbol in a regular object, and the size in
1294 the regular object is larger, we must make sure that we use the
1295 larger size. This problematic case can always be avoided in C,
1296 but it must be handled correctly when using Fortran shared
1299 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1300 likewise for OLDDYNCOMMON and OLDDEF.
1302 Note that this test is just a heuristic, and that it is quite
1303 possible to have an uninitialized symbol in a shared object which
1304 is really a definition, rather than a common symbol. This could
1305 lead to some minor confusion when the symbol really is a common
1306 symbol in some regular object. However, I think it will be
1312 && (sec
->flags
& SEC_ALLOC
) != 0
1313 && (sec
->flags
& SEC_LOAD
) == 0
1316 newdyncommon
= TRUE
;
1318 newdyncommon
= FALSE
;
1322 && h
->root
.type
== bfd_link_hash_defined
1324 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1325 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1328 olddyncommon
= TRUE
;
1330 olddyncommon
= FALSE
;
1332 /* We now know everything about the old and new symbols. We ask the
1333 backend to check if we can merge them. */
1334 if (bed
->merge_symbol
1335 && !bed
->merge_symbol (info
, sym_hash
, h
, sym
, psec
, pvalue
,
1336 pold_alignment
, skip
, override
,
1337 type_change_ok
, size_change_ok
,
1338 &newdyn
, &newdef
, &newdyncommon
, &newweak
,
1340 &olddyn
, &olddef
, &olddyncommon
, &oldweak
,
1344 /* If both the old and the new symbols look like common symbols in a
1345 dynamic object, set the size of the symbol to the larger of the
1350 && sym
->st_size
!= h
->size
)
1352 /* Since we think we have two common symbols, issue a multiple
1353 common warning if desired. Note that we only warn if the
1354 size is different. If the size is the same, we simply let
1355 the old symbol override the new one as normally happens with
1356 symbols defined in dynamic objects. */
1358 if (! ((*info
->callbacks
->multiple_common
)
1359 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1360 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1363 if (sym
->st_size
> h
->size
)
1364 h
->size
= sym
->st_size
;
1366 *size_change_ok
= TRUE
;
1369 /* If we are looking at a dynamic object, and we have found a
1370 definition, we need to see if the symbol was already defined by
1371 some other object. If so, we want to use the existing
1372 definition, and we do not want to report a multiple symbol
1373 definition error; we do this by clobbering *PSEC to be
1374 bfd_und_section_ptr.
1376 We treat a common symbol as a definition if the symbol in the
1377 shared library is a function, since common symbols always
1378 represent variables; this can cause confusion in principle, but
1379 any such confusion would seem to indicate an erroneous program or
1380 shared library. We also permit a common symbol in a regular
1381 object to override a weak symbol in a shared object. */
1386 || (h
->root
.type
== bfd_link_hash_common
1387 && (newweak
|| newfunc
))))
1391 newdyncommon
= FALSE
;
1393 *psec
= sec
= bfd_und_section_ptr
;
1394 *size_change_ok
= TRUE
;
1396 /* If we get here when the old symbol is a common symbol, then
1397 we are explicitly letting it override a weak symbol or
1398 function in a dynamic object, and we don't want to warn about
1399 a type change. If the old symbol is a defined symbol, a type
1400 change warning may still be appropriate. */
1402 if (h
->root
.type
== bfd_link_hash_common
)
1403 *type_change_ok
= TRUE
;
1406 /* Handle the special case of an old common symbol merging with a
1407 new symbol which looks like a common symbol in a shared object.
1408 We change *PSEC and *PVALUE to make the new symbol look like a
1409 common symbol, and let _bfd_generic_link_add_one_symbol do the
1413 && h
->root
.type
== bfd_link_hash_common
)
1417 newdyncommon
= FALSE
;
1418 *pvalue
= sym
->st_size
;
1419 *psec
= sec
= bed
->common_section (oldsec
);
1420 *size_change_ok
= TRUE
;
1423 /* Skip weak definitions of symbols that are already defined. */
1424 if (newdef
&& olddef
&& newweak
)
1428 /* Merge st_other. If the symbol already has a dynamic index,
1429 but visibility says it should not be visible, turn it into a
1431 elf_merge_st_other (abfd
, h
, sym
, newdef
, newdyn
);
1432 if (h
->dynindx
!= -1)
1433 switch (ELF_ST_VISIBILITY (h
->other
))
1437 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1442 /* If the old symbol is from a dynamic object, and the new symbol is
1443 a definition which is not from a dynamic object, then the new
1444 symbol overrides the old symbol. Symbols from regular files
1445 always take precedence over symbols from dynamic objects, even if
1446 they are defined after the dynamic object in the link.
1448 As above, we again permit a common symbol in a regular object to
1449 override a definition in a shared object if the shared object
1450 symbol is a function or is weak. */
1455 || (bfd_is_com_section (sec
)
1456 && (oldweak
|| oldfunc
)))
1461 /* Change the hash table entry to undefined, and let
1462 _bfd_generic_link_add_one_symbol do the right thing with the
1465 h
->root
.type
= bfd_link_hash_undefined
;
1466 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1467 *size_change_ok
= TRUE
;
1470 olddyncommon
= FALSE
;
1472 /* We again permit a type change when a common symbol may be
1473 overriding a function. */
1475 if (bfd_is_com_section (sec
))
1479 /* If a common symbol overrides a function, make sure
1480 that it isn't defined dynamically nor has type
1483 h
->type
= STT_NOTYPE
;
1485 *type_change_ok
= TRUE
;
1488 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1491 /* This union may have been set to be non-NULL when this symbol
1492 was seen in a dynamic object. We must force the union to be
1493 NULL, so that it is correct for a regular symbol. */
1494 h
->verinfo
.vertree
= NULL
;
1497 /* Handle the special case of a new common symbol merging with an
1498 old symbol that looks like it might be a common symbol defined in
1499 a shared object. Note that we have already handled the case in
1500 which a new common symbol should simply override the definition
1501 in the shared library. */
1504 && bfd_is_com_section (sec
)
1507 /* It would be best if we could set the hash table entry to a
1508 common symbol, but we don't know what to use for the section
1509 or the alignment. */
1510 if (! ((*info
->callbacks
->multiple_common
)
1511 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1512 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1515 /* If the presumed common symbol in the dynamic object is
1516 larger, pretend that the new symbol has its size. */
1518 if (h
->size
> *pvalue
)
1521 /* We need to remember the alignment required by the symbol
1522 in the dynamic object. */
1523 BFD_ASSERT (pold_alignment
);
1524 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1527 olddyncommon
= FALSE
;
1529 h
->root
.type
= bfd_link_hash_undefined
;
1530 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1532 *size_change_ok
= TRUE
;
1533 *type_change_ok
= TRUE
;
1535 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1538 h
->verinfo
.vertree
= NULL
;
1543 /* Handle the case where we had a versioned symbol in a dynamic
1544 library and now find a definition in a normal object. In this
1545 case, we make the versioned symbol point to the normal one. */
1546 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1547 flip
->root
.type
= h
->root
.type
;
1548 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1549 h
->root
.type
= bfd_link_hash_indirect
;
1550 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1551 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1555 flip
->ref_dynamic
= 1;
1562 /* This function is called to create an indirect symbol from the
1563 default for the symbol with the default version if needed. The
1564 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1565 set DYNSYM if the new indirect symbol is dynamic. */
1568 _bfd_elf_add_default_symbol (bfd
*abfd
,
1569 struct bfd_link_info
*info
,
1570 struct elf_link_hash_entry
*h
,
1572 Elf_Internal_Sym
*sym
,
1575 bfd_boolean
*dynsym
,
1576 bfd_boolean override
)
1578 bfd_boolean type_change_ok
;
1579 bfd_boolean size_change_ok
;
1582 struct elf_link_hash_entry
*hi
;
1583 struct bfd_link_hash_entry
*bh
;
1584 const struct elf_backend_data
*bed
;
1585 bfd_boolean collect
;
1586 bfd_boolean dynamic
;
1588 size_t len
, shortlen
;
1591 /* If this symbol has a version, and it is the default version, we
1592 create an indirect symbol from the default name to the fully
1593 decorated name. This will cause external references which do not
1594 specify a version to be bound to this version of the symbol. */
1595 p
= strchr (name
, ELF_VER_CHR
);
1596 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1601 /* We are overridden by an old definition. We need to check if we
1602 need to create the indirect symbol from the default name. */
1603 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1605 BFD_ASSERT (hi
!= NULL
);
1608 while (hi
->root
.type
== bfd_link_hash_indirect
1609 || hi
->root
.type
== bfd_link_hash_warning
)
1611 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1617 bed
= get_elf_backend_data (abfd
);
1618 collect
= bed
->collect
;
1619 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1621 shortlen
= p
- name
;
1622 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1623 if (shortname
== NULL
)
1625 memcpy (shortname
, name
, shortlen
);
1626 shortname
[shortlen
] = '\0';
1628 /* We are going to create a new symbol. Merge it with any existing
1629 symbol with this name. For the purposes of the merge, act as
1630 though we were defining the symbol we just defined, although we
1631 actually going to define an indirect symbol. */
1632 type_change_ok
= FALSE
;
1633 size_change_ok
= FALSE
;
1635 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1636 NULL
, &hi
, &skip
, &override
,
1637 &type_change_ok
, &size_change_ok
))
1646 if (! (_bfd_generic_link_add_one_symbol
1647 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1648 0, name
, FALSE
, collect
, &bh
)))
1650 hi
= (struct elf_link_hash_entry
*) bh
;
1654 /* In this case the symbol named SHORTNAME is overriding the
1655 indirect symbol we want to add. We were planning on making
1656 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1657 is the name without a version. NAME is the fully versioned
1658 name, and it is the default version.
1660 Overriding means that we already saw a definition for the
1661 symbol SHORTNAME in a regular object, and it is overriding
1662 the symbol defined in the dynamic object.
1664 When this happens, we actually want to change NAME, the
1665 symbol we just added, to refer to SHORTNAME. This will cause
1666 references to NAME in the shared object to become references
1667 to SHORTNAME in the regular object. This is what we expect
1668 when we override a function in a shared object: that the
1669 references in the shared object will be mapped to the
1670 definition in the regular object. */
1672 while (hi
->root
.type
== bfd_link_hash_indirect
1673 || hi
->root
.type
== bfd_link_hash_warning
)
1674 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1676 h
->root
.type
= bfd_link_hash_indirect
;
1677 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1681 hi
->ref_dynamic
= 1;
1685 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1690 /* Now set HI to H, so that the following code will set the
1691 other fields correctly. */
1695 /* Check if HI is a warning symbol. */
1696 if (hi
->root
.type
== bfd_link_hash_warning
)
1697 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1699 /* If there is a duplicate definition somewhere, then HI may not
1700 point to an indirect symbol. We will have reported an error to
1701 the user in that case. */
1703 if (hi
->root
.type
== bfd_link_hash_indirect
)
1705 struct elf_link_hash_entry
*ht
;
1707 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1708 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1710 /* See if the new flags lead us to realize that the symbol must
1722 if (hi
->ref_regular
)
1728 /* We also need to define an indirection from the nondefault version
1732 len
= strlen (name
);
1733 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1734 if (shortname
== NULL
)
1736 memcpy (shortname
, name
, shortlen
);
1737 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1739 /* Once again, merge with any existing symbol. */
1740 type_change_ok
= FALSE
;
1741 size_change_ok
= FALSE
;
1743 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1744 NULL
, &hi
, &skip
, &override
,
1745 &type_change_ok
, &size_change_ok
))
1753 /* Here SHORTNAME is a versioned name, so we don't expect to see
1754 the type of override we do in the case above unless it is
1755 overridden by a versioned definition. */
1756 if (hi
->root
.type
!= bfd_link_hash_defined
1757 && hi
->root
.type
!= bfd_link_hash_defweak
)
1758 (*_bfd_error_handler
)
1759 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1765 if (! (_bfd_generic_link_add_one_symbol
1766 (info
, abfd
, shortname
, BSF_INDIRECT
,
1767 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1769 hi
= (struct elf_link_hash_entry
*) bh
;
1771 /* If there is a duplicate definition somewhere, then HI may not
1772 point to an indirect symbol. We will have reported an error
1773 to the user in that case. */
1775 if (hi
->root
.type
== bfd_link_hash_indirect
)
1777 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1779 /* See if the new flags lead us to realize that the symbol
1791 if (hi
->ref_regular
)
1801 /* This routine is used to export all defined symbols into the dynamic
1802 symbol table. It is called via elf_link_hash_traverse. */
1805 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1807 struct elf_info_failed
*eif
= data
;
1809 /* Ignore this if we won't export it. */
1810 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
1813 /* Ignore indirect symbols. These are added by the versioning code. */
1814 if (h
->root
.type
== bfd_link_hash_indirect
)
1817 if (h
->root
.type
== bfd_link_hash_warning
)
1818 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1820 if (h
->dynindx
== -1
1826 if (eif
->verdefs
== NULL
1827 || (bfd_find_version_for_sym (eif
->verdefs
, h
->root
.root
.string
, &hide
)
1830 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1841 /* Look through the symbols which are defined in other shared
1842 libraries and referenced here. Update the list of version
1843 dependencies. This will be put into the .gnu.version_r section.
1844 This function is called via elf_link_hash_traverse. */
1847 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1850 struct elf_find_verdep_info
*rinfo
= data
;
1851 Elf_Internal_Verneed
*t
;
1852 Elf_Internal_Vernaux
*a
;
1855 if (h
->root
.type
== bfd_link_hash_warning
)
1856 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1858 /* We only care about symbols defined in shared objects with version
1863 || h
->verinfo
.verdef
== NULL
)
1866 /* See if we already know about this version. */
1867 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1871 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1874 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1875 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1881 /* This is a new version. Add it to tree we are building. */
1886 t
= bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1889 rinfo
->failed
= TRUE
;
1893 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1894 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1895 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
1899 a
= bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1902 rinfo
->failed
= TRUE
;
1906 /* Note that we are copying a string pointer here, and testing it
1907 above. If bfd_elf_string_from_elf_section is ever changed to
1908 discard the string data when low in memory, this will have to be
1910 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1912 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1913 a
->vna_nextptr
= t
->vn_auxptr
;
1915 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1918 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1925 /* Figure out appropriate versions for all the symbols. We may not
1926 have the version number script until we have read all of the input
1927 files, so until that point we don't know which symbols should be
1928 local. This function is called via elf_link_hash_traverse. */
1931 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1933 struct elf_info_failed
*sinfo
;
1934 struct bfd_link_info
*info
;
1935 const struct elf_backend_data
*bed
;
1936 struct elf_info_failed eif
;
1943 if (h
->root
.type
== bfd_link_hash_warning
)
1944 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1946 /* Fix the symbol flags. */
1949 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1952 sinfo
->failed
= TRUE
;
1956 /* We only need version numbers for symbols defined in regular
1958 if (!h
->def_regular
)
1961 bed
= get_elf_backend_data (info
->output_bfd
);
1962 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1963 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1965 struct bfd_elf_version_tree
*t
;
1970 /* There are two consecutive ELF_VER_CHR characters if this is
1971 not a hidden symbol. */
1973 if (*p
== ELF_VER_CHR
)
1979 /* If there is no version string, we can just return out. */
1987 /* Look for the version. If we find it, it is no longer weak. */
1988 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1990 if (strcmp (t
->name
, p
) == 0)
1994 struct bfd_elf_version_expr
*d
;
1996 len
= p
- h
->root
.root
.string
;
1997 alc
= bfd_malloc (len
);
2000 sinfo
->failed
= TRUE
;
2003 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2004 alc
[len
- 1] = '\0';
2005 if (alc
[len
- 2] == ELF_VER_CHR
)
2006 alc
[len
- 2] = '\0';
2008 h
->verinfo
.vertree
= t
;
2012 if (t
->globals
.list
!= NULL
)
2013 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2015 /* See if there is anything to force this symbol to
2017 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2019 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2022 && ! info
->export_dynamic
)
2023 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2031 /* If we are building an application, we need to create a
2032 version node for this version. */
2033 if (t
== NULL
&& info
->executable
)
2035 struct bfd_elf_version_tree
**pp
;
2038 /* If we aren't going to export this symbol, we don't need
2039 to worry about it. */
2040 if (h
->dynindx
== -1)
2044 t
= bfd_zalloc (info
->output_bfd
, amt
);
2047 sinfo
->failed
= TRUE
;
2052 t
->name_indx
= (unsigned int) -1;
2056 /* Don't count anonymous version tag. */
2057 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
2059 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2061 t
->vernum
= version_index
;
2065 h
->verinfo
.vertree
= t
;
2069 /* We could not find the version for a symbol when
2070 generating a shared archive. Return an error. */
2071 (*_bfd_error_handler
)
2072 (_("%B: version node not found for symbol %s"),
2073 info
->output_bfd
, h
->root
.root
.string
);
2074 bfd_set_error (bfd_error_bad_value
);
2075 sinfo
->failed
= TRUE
;
2083 /* If we don't have a version for this symbol, see if we can find
2085 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2089 h
->verinfo
.vertree
= bfd_find_version_for_sym (sinfo
->verdefs
,
2090 h
->root
.root
.string
, &hide
);
2091 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2092 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2098 /* Read and swap the relocs from the section indicated by SHDR. This
2099 may be either a REL or a RELA section. The relocations are
2100 translated into RELA relocations and stored in INTERNAL_RELOCS,
2101 which should have already been allocated to contain enough space.
2102 The EXTERNAL_RELOCS are a buffer where the external form of the
2103 relocations should be stored.
2105 Returns FALSE if something goes wrong. */
2108 elf_link_read_relocs_from_section (bfd
*abfd
,
2110 Elf_Internal_Shdr
*shdr
,
2111 void *external_relocs
,
2112 Elf_Internal_Rela
*internal_relocs
)
2114 const struct elf_backend_data
*bed
;
2115 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2116 const bfd_byte
*erela
;
2117 const bfd_byte
*erelaend
;
2118 Elf_Internal_Rela
*irela
;
2119 Elf_Internal_Shdr
*symtab_hdr
;
2122 /* Position ourselves at the start of the section. */
2123 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2126 /* Read the relocations. */
2127 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2130 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2131 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2133 bed
= get_elf_backend_data (abfd
);
2135 /* Convert the external relocations to the internal format. */
2136 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2137 swap_in
= bed
->s
->swap_reloc_in
;
2138 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2139 swap_in
= bed
->s
->swap_reloca_in
;
2142 bfd_set_error (bfd_error_wrong_format
);
2146 erela
= external_relocs
;
2147 erelaend
= erela
+ shdr
->sh_size
;
2148 irela
= internal_relocs
;
2149 while (erela
< erelaend
)
2153 (*swap_in
) (abfd
, erela
, irela
);
2154 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2155 if (bed
->s
->arch_size
== 64)
2159 if ((size_t) r_symndx
>= nsyms
)
2161 (*_bfd_error_handler
)
2162 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2163 " for offset 0x%lx in section `%A'"),
2165 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2166 bfd_set_error (bfd_error_bad_value
);
2170 else if (r_symndx
!= 0)
2172 (*_bfd_error_handler
)
2173 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2174 " when the object file has no symbol table"),
2176 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2177 bfd_set_error (bfd_error_bad_value
);
2180 irela
+= bed
->s
->int_rels_per_ext_rel
;
2181 erela
+= shdr
->sh_entsize
;
2187 /* Read and swap the relocs for a section O. They may have been
2188 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2189 not NULL, they are used as buffers to read into. They are known to
2190 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2191 the return value is allocated using either malloc or bfd_alloc,
2192 according to the KEEP_MEMORY argument. If O has two relocation
2193 sections (both REL and RELA relocations), then the REL_HDR
2194 relocations will appear first in INTERNAL_RELOCS, followed by the
2195 REL_HDR2 relocations. */
2198 _bfd_elf_link_read_relocs (bfd
*abfd
,
2200 void *external_relocs
,
2201 Elf_Internal_Rela
*internal_relocs
,
2202 bfd_boolean keep_memory
)
2204 Elf_Internal_Shdr
*rel_hdr
;
2205 void *alloc1
= NULL
;
2206 Elf_Internal_Rela
*alloc2
= NULL
;
2207 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2209 if (elf_section_data (o
)->relocs
!= NULL
)
2210 return elf_section_data (o
)->relocs
;
2212 if (o
->reloc_count
== 0)
2215 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2217 if (internal_relocs
== NULL
)
2221 size
= o
->reloc_count
;
2222 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2224 internal_relocs
= alloc2
= bfd_alloc (abfd
, size
);
2226 internal_relocs
= alloc2
= bfd_malloc (size
);
2227 if (internal_relocs
== NULL
)
2231 if (external_relocs
== NULL
)
2233 bfd_size_type size
= rel_hdr
->sh_size
;
2235 if (elf_section_data (o
)->rel_hdr2
)
2236 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2237 alloc1
= bfd_malloc (size
);
2240 external_relocs
= alloc1
;
2243 if (!elf_link_read_relocs_from_section (abfd
, o
, rel_hdr
,
2247 if (elf_section_data (o
)->rel_hdr2
2248 && (!elf_link_read_relocs_from_section
2250 elf_section_data (o
)->rel_hdr2
,
2251 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2252 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2253 * bed
->s
->int_rels_per_ext_rel
))))
2256 /* Cache the results for next time, if we can. */
2258 elf_section_data (o
)->relocs
= internal_relocs
;
2263 /* Don't free alloc2, since if it was allocated we are passing it
2264 back (under the name of internal_relocs). */
2266 return internal_relocs
;
2274 bfd_release (abfd
, alloc2
);
2281 /* Compute the size of, and allocate space for, REL_HDR which is the
2282 section header for a section containing relocations for O. */
2285 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2286 Elf_Internal_Shdr
*rel_hdr
,
2289 bfd_size_type reloc_count
;
2290 bfd_size_type num_rel_hashes
;
2292 /* Figure out how many relocations there will be. */
2293 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
2294 reloc_count
= elf_section_data (o
)->rel_count
;
2296 reloc_count
= elf_section_data (o
)->rel_count2
;
2298 num_rel_hashes
= o
->reloc_count
;
2299 if (num_rel_hashes
< reloc_count
)
2300 num_rel_hashes
= reloc_count
;
2302 /* That allows us to calculate the size of the section. */
2303 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
2305 /* The contents field must last into write_object_contents, so we
2306 allocate it with bfd_alloc rather than malloc. Also since we
2307 cannot be sure that the contents will actually be filled in,
2308 we zero the allocated space. */
2309 rel_hdr
->contents
= bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2310 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2313 /* We only allocate one set of hash entries, so we only do it the
2314 first time we are called. */
2315 if (elf_section_data (o
)->rel_hashes
== NULL
2318 struct elf_link_hash_entry
**p
;
2320 p
= bfd_zmalloc (num_rel_hashes
* sizeof (struct elf_link_hash_entry
*));
2324 elf_section_data (o
)->rel_hashes
= p
;
2330 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2331 originated from the section given by INPUT_REL_HDR) to the
2335 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2336 asection
*input_section
,
2337 Elf_Internal_Shdr
*input_rel_hdr
,
2338 Elf_Internal_Rela
*internal_relocs
,
2339 struct elf_link_hash_entry
**rel_hash
2342 Elf_Internal_Rela
*irela
;
2343 Elf_Internal_Rela
*irelaend
;
2345 Elf_Internal_Shdr
*output_rel_hdr
;
2346 asection
*output_section
;
2347 unsigned int *rel_countp
= NULL
;
2348 const struct elf_backend_data
*bed
;
2349 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2351 output_section
= input_section
->output_section
;
2352 output_rel_hdr
= NULL
;
2354 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
2355 == input_rel_hdr
->sh_entsize
)
2357 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
2358 rel_countp
= &elf_section_data (output_section
)->rel_count
;
2360 else if (elf_section_data (output_section
)->rel_hdr2
2361 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
2362 == input_rel_hdr
->sh_entsize
))
2364 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
2365 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
2369 (*_bfd_error_handler
)
2370 (_("%B: relocation size mismatch in %B section %A"),
2371 output_bfd
, input_section
->owner
, input_section
);
2372 bfd_set_error (bfd_error_wrong_format
);
2376 bed
= get_elf_backend_data (output_bfd
);
2377 if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2378 swap_out
= bed
->s
->swap_reloc_out
;
2379 else if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2380 swap_out
= bed
->s
->swap_reloca_out
;
2384 erel
= output_rel_hdr
->contents
;
2385 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
2386 irela
= internal_relocs
;
2387 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2388 * bed
->s
->int_rels_per_ext_rel
);
2389 while (irela
< irelaend
)
2391 (*swap_out
) (output_bfd
, irela
, erel
);
2392 irela
+= bed
->s
->int_rels_per_ext_rel
;
2393 erel
+= input_rel_hdr
->sh_entsize
;
2396 /* Bump the counter, so that we know where to add the next set of
2398 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2403 /* Make weak undefined symbols in PIE dynamic. */
2406 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2407 struct elf_link_hash_entry
*h
)
2411 && h
->root
.type
== bfd_link_hash_undefweak
)
2412 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2417 /* Fix up the flags for a symbol. This handles various cases which
2418 can only be fixed after all the input files are seen. This is
2419 currently called by both adjust_dynamic_symbol and
2420 assign_sym_version, which is unnecessary but perhaps more robust in
2421 the face of future changes. */
2424 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2425 struct elf_info_failed
*eif
)
2427 const struct elf_backend_data
*bed
;
2429 /* If this symbol was mentioned in a non-ELF file, try to set
2430 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2431 permit a non-ELF file to correctly refer to a symbol defined in
2432 an ELF dynamic object. */
2435 while (h
->root
.type
== bfd_link_hash_indirect
)
2436 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2438 if (h
->root
.type
!= bfd_link_hash_defined
2439 && h
->root
.type
!= bfd_link_hash_defweak
)
2442 h
->ref_regular_nonweak
= 1;
2446 if (h
->root
.u
.def
.section
->owner
!= NULL
2447 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2448 == bfd_target_elf_flavour
))
2451 h
->ref_regular_nonweak
= 1;
2457 if (h
->dynindx
== -1
2461 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2470 /* Unfortunately, NON_ELF is only correct if the symbol
2471 was first seen in a non-ELF file. Fortunately, if the symbol
2472 was first seen in an ELF file, we're probably OK unless the
2473 symbol was defined in a non-ELF file. Catch that case here.
2474 FIXME: We're still in trouble if the symbol was first seen in
2475 a dynamic object, and then later in a non-ELF regular object. */
2476 if ((h
->root
.type
== bfd_link_hash_defined
2477 || h
->root
.type
== bfd_link_hash_defweak
)
2479 && (h
->root
.u
.def
.section
->owner
!= NULL
2480 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2481 != bfd_target_elf_flavour
)
2482 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2483 && !h
->def_dynamic
)))
2487 /* Backend specific symbol fixup. */
2488 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2489 if (bed
->elf_backend_fixup_symbol
2490 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2493 /* If this is a final link, and the symbol was defined as a common
2494 symbol in a regular object file, and there was no definition in
2495 any dynamic object, then the linker will have allocated space for
2496 the symbol in a common section but the DEF_REGULAR
2497 flag will not have been set. */
2498 if (h
->root
.type
== bfd_link_hash_defined
2502 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2505 /* If -Bsymbolic was used (which means to bind references to global
2506 symbols to the definition within the shared object), and this
2507 symbol was defined in a regular object, then it actually doesn't
2508 need a PLT entry. Likewise, if the symbol has non-default
2509 visibility. If the symbol has hidden or internal visibility, we
2510 will force it local. */
2512 && eif
->info
->shared
2513 && is_elf_hash_table (eif
->info
->hash
)
2514 && (SYMBOLIC_BIND (eif
->info
, h
)
2515 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2518 bfd_boolean force_local
;
2520 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2521 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2522 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2525 /* If a weak undefined symbol has non-default visibility, we also
2526 hide it from the dynamic linker. */
2527 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2528 && h
->root
.type
== bfd_link_hash_undefweak
)
2529 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2531 /* If this is a weak defined symbol in a dynamic object, and we know
2532 the real definition in the dynamic object, copy interesting flags
2533 over to the real definition. */
2534 if (h
->u
.weakdef
!= NULL
)
2536 struct elf_link_hash_entry
*weakdef
;
2538 weakdef
= h
->u
.weakdef
;
2539 if (h
->root
.type
== bfd_link_hash_indirect
)
2540 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2542 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2543 || h
->root
.type
== bfd_link_hash_defweak
);
2544 BFD_ASSERT (weakdef
->def_dynamic
);
2546 /* If the real definition is defined by a regular object file,
2547 don't do anything special. See the longer description in
2548 _bfd_elf_adjust_dynamic_symbol, below. */
2549 if (weakdef
->def_regular
)
2550 h
->u
.weakdef
= NULL
;
2553 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2554 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2555 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2562 /* Make the backend pick a good value for a dynamic symbol. This is
2563 called via elf_link_hash_traverse, and also calls itself
2567 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2569 struct elf_info_failed
*eif
= data
;
2571 const struct elf_backend_data
*bed
;
2573 if (! is_elf_hash_table (eif
->info
->hash
))
2576 if (h
->root
.type
== bfd_link_hash_warning
)
2578 h
->got
= elf_hash_table (eif
->info
)->init_got_offset
;
2579 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2581 /* When warning symbols are created, they **replace** the "real"
2582 entry in the hash table, thus we never get to see the real
2583 symbol in a hash traversal. So look at it now. */
2584 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2587 /* Ignore indirect symbols. These are added by the versioning code. */
2588 if (h
->root
.type
== bfd_link_hash_indirect
)
2591 /* Fix the symbol flags. */
2592 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2595 /* If this symbol does not require a PLT entry, and it is not
2596 defined by a dynamic object, or is not referenced by a regular
2597 object, ignore it. We do have to handle a weak defined symbol,
2598 even if no regular object refers to it, if we decided to add it
2599 to the dynamic symbol table. FIXME: Do we normally need to worry
2600 about symbols which are defined by one dynamic object and
2601 referenced by another one? */
2606 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2608 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2612 /* If we've already adjusted this symbol, don't do it again. This
2613 can happen via a recursive call. */
2614 if (h
->dynamic_adjusted
)
2617 /* Don't look at this symbol again. Note that we must set this
2618 after checking the above conditions, because we may look at a
2619 symbol once, decide not to do anything, and then get called
2620 recursively later after REF_REGULAR is set below. */
2621 h
->dynamic_adjusted
= 1;
2623 /* If this is a weak definition, and we know a real definition, and
2624 the real symbol is not itself defined by a regular object file,
2625 then get a good value for the real definition. We handle the
2626 real symbol first, for the convenience of the backend routine.
2628 Note that there is a confusing case here. If the real definition
2629 is defined by a regular object file, we don't get the real symbol
2630 from the dynamic object, but we do get the weak symbol. If the
2631 processor backend uses a COPY reloc, then if some routine in the
2632 dynamic object changes the real symbol, we will not see that
2633 change in the corresponding weak symbol. This is the way other
2634 ELF linkers work as well, and seems to be a result of the shared
2637 I will clarify this issue. Most SVR4 shared libraries define the
2638 variable _timezone and define timezone as a weak synonym. The
2639 tzset call changes _timezone. If you write
2640 extern int timezone;
2642 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2643 you might expect that, since timezone is a synonym for _timezone,
2644 the same number will print both times. However, if the processor
2645 backend uses a COPY reloc, then actually timezone will be copied
2646 into your process image, and, since you define _timezone
2647 yourself, _timezone will not. Thus timezone and _timezone will
2648 wind up at different memory locations. The tzset call will set
2649 _timezone, leaving timezone unchanged. */
2651 if (h
->u
.weakdef
!= NULL
)
2653 /* If we get to this point, we know there is an implicit
2654 reference by a regular object file via the weak symbol H.
2655 FIXME: Is this really true? What if the traversal finds
2656 H->U.WEAKDEF before it finds H? */
2657 h
->u
.weakdef
->ref_regular
= 1;
2659 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2663 /* If a symbol has no type and no size and does not require a PLT
2664 entry, then we are probably about to do the wrong thing here: we
2665 are probably going to create a COPY reloc for an empty object.
2666 This case can arise when a shared object is built with assembly
2667 code, and the assembly code fails to set the symbol type. */
2669 && h
->type
== STT_NOTYPE
2671 (*_bfd_error_handler
)
2672 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2673 h
->root
.root
.string
);
2675 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2676 bed
= get_elf_backend_data (dynobj
);
2679 if (h
->type
== STT_GNU_IFUNC
2680 && (bed
->elf_osabi
== ELFOSABI_LINUX
2681 /* GNU/Linux is still using the default value 0. */
2682 || bed
->elf_osabi
== ELFOSABI_NONE
))
2685 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2694 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2698 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry
*h
,
2701 unsigned int power_of_two
;
2703 asection
*sec
= h
->root
.u
.def
.section
;
2705 /* The section aligment of definition is the maximum alignment
2706 requirement of symbols defined in the section. Since we don't
2707 know the symbol alignment requirement, we start with the
2708 maximum alignment and check low bits of the symbol address
2709 for the minimum alignment. */
2710 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2711 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2712 while ((h
->root
.u
.def
.value
& mask
) != 0)
2718 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2721 /* Adjust the section alignment if needed. */
2722 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2727 /* We make sure that the symbol will be aligned properly. */
2728 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2730 /* Define the symbol as being at this point in DYNBSS. */
2731 h
->root
.u
.def
.section
= dynbss
;
2732 h
->root
.u
.def
.value
= dynbss
->size
;
2734 /* Increment the size of DYNBSS to make room for the symbol. */
2735 dynbss
->size
+= h
->size
;
2740 /* Adjust all external symbols pointing into SEC_MERGE sections
2741 to reflect the object merging within the sections. */
2744 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2748 if (h
->root
.type
== bfd_link_hash_warning
)
2749 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2751 if ((h
->root
.type
== bfd_link_hash_defined
2752 || h
->root
.type
== bfd_link_hash_defweak
)
2753 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2754 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2756 bfd
*output_bfd
= data
;
2758 h
->root
.u
.def
.value
=
2759 _bfd_merged_section_offset (output_bfd
,
2760 &h
->root
.u
.def
.section
,
2761 elf_section_data (sec
)->sec_info
,
2762 h
->root
.u
.def
.value
);
2768 /* Returns false if the symbol referred to by H should be considered
2769 to resolve local to the current module, and true if it should be
2770 considered to bind dynamically. */
2773 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2774 struct bfd_link_info
*info
,
2775 bfd_boolean ignore_protected
)
2777 bfd_boolean binding_stays_local_p
;
2778 const struct elf_backend_data
*bed
;
2779 struct elf_link_hash_table
*hash_table
;
2784 while (h
->root
.type
== bfd_link_hash_indirect
2785 || h
->root
.type
== bfd_link_hash_warning
)
2786 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2788 /* If it was forced local, then clearly it's not dynamic. */
2789 if (h
->dynindx
== -1)
2791 if (h
->forced_local
)
2794 /* Identify the cases where name binding rules say that a
2795 visible symbol resolves locally. */
2796 binding_stays_local_p
= info
->executable
|| SYMBOLIC_BIND (info
, h
);
2798 switch (ELF_ST_VISIBILITY (h
->other
))
2805 hash_table
= elf_hash_table (info
);
2806 if (!is_elf_hash_table (hash_table
))
2809 bed
= get_elf_backend_data (hash_table
->dynobj
);
2811 /* Proper resolution for function pointer equality may require
2812 that these symbols perhaps be resolved dynamically, even though
2813 we should be resolving them to the current module. */
2814 if (!ignore_protected
|| !bed
->is_function_type (h
->type
))
2815 binding_stays_local_p
= TRUE
;
2822 /* If it isn't defined locally, then clearly it's dynamic. */
2823 if (!h
->def_regular
)
2826 /* Otherwise, the symbol is dynamic if binding rules don't tell
2827 us that it remains local. */
2828 return !binding_stays_local_p
;
2831 /* Return true if the symbol referred to by H should be considered
2832 to resolve local to the current module, and false otherwise. Differs
2833 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2834 undefined symbols and weak symbols. */
2837 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2838 struct bfd_link_info
*info
,
2839 bfd_boolean local_protected
)
2841 const struct elf_backend_data
*bed
;
2842 struct elf_link_hash_table
*hash_table
;
2844 /* If it's a local sym, of course we resolve locally. */
2848 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2849 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
2850 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
2853 /* Common symbols that become definitions don't get the DEF_REGULAR
2854 flag set, so test it first, and don't bail out. */
2855 if (ELF_COMMON_DEF_P (h
))
2857 /* If we don't have a definition in a regular file, then we can't
2858 resolve locally. The sym is either undefined or dynamic. */
2859 else if (!h
->def_regular
)
2862 /* Forced local symbols resolve locally. */
2863 if (h
->forced_local
)
2866 /* As do non-dynamic symbols. */
2867 if (h
->dynindx
== -1)
2870 /* At this point, we know the symbol is defined and dynamic. In an
2871 executable it must resolve locally, likewise when building symbolic
2872 shared libraries. */
2873 if (info
->executable
|| SYMBOLIC_BIND (info
, h
))
2876 /* Now deal with defined dynamic symbols in shared libraries. Ones
2877 with default visibility might not resolve locally. */
2878 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2881 hash_table
= elf_hash_table (info
);
2882 if (!is_elf_hash_table (hash_table
))
2885 bed
= get_elf_backend_data (hash_table
->dynobj
);
2887 /* STV_PROTECTED non-function symbols are local. */
2888 if (!bed
->is_function_type (h
->type
))
2891 /* Function pointer equality tests may require that STV_PROTECTED
2892 symbols be treated as dynamic symbols, even when we know that the
2893 dynamic linker will resolve them locally. */
2894 return local_protected
;
2897 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2898 aligned. Returns the first TLS output section. */
2900 struct bfd_section
*
2901 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2903 struct bfd_section
*sec
, *tls
;
2904 unsigned int align
= 0;
2906 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2907 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2911 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2912 if (sec
->alignment_power
> align
)
2913 align
= sec
->alignment_power
;
2915 elf_hash_table (info
)->tls_sec
= tls
;
2917 /* Ensure the alignment of the first section is the largest alignment,
2918 so that the tls segment starts aligned. */
2920 tls
->alignment_power
= align
;
2925 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2927 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2928 Elf_Internal_Sym
*sym
)
2930 const struct elf_backend_data
*bed
;
2932 /* Local symbols do not count, but target specific ones might. */
2933 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2934 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2937 bed
= get_elf_backend_data (abfd
);
2938 /* Function symbols do not count. */
2939 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
2942 /* If the section is undefined, then so is the symbol. */
2943 if (sym
->st_shndx
== SHN_UNDEF
)
2946 /* If the symbol is defined in the common section, then
2947 it is a common definition and so does not count. */
2948 if (bed
->common_definition (sym
))
2951 /* If the symbol is in a target specific section then we
2952 must rely upon the backend to tell us what it is. */
2953 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2954 /* FIXME - this function is not coded yet:
2956 return _bfd_is_global_symbol_definition (abfd, sym);
2958 Instead for now assume that the definition is not global,
2959 Even if this is wrong, at least the linker will behave
2960 in the same way that it used to do. */
2966 /* Search the symbol table of the archive element of the archive ABFD
2967 whose archive map contains a mention of SYMDEF, and determine if
2968 the symbol is defined in this element. */
2970 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2972 Elf_Internal_Shdr
* hdr
;
2973 bfd_size_type symcount
;
2974 bfd_size_type extsymcount
;
2975 bfd_size_type extsymoff
;
2976 Elf_Internal_Sym
*isymbuf
;
2977 Elf_Internal_Sym
*isym
;
2978 Elf_Internal_Sym
*isymend
;
2981 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2985 if (! bfd_check_format (abfd
, bfd_object
))
2988 /* If we have already included the element containing this symbol in the
2989 link then we do not need to include it again. Just claim that any symbol
2990 it contains is not a definition, so that our caller will not decide to
2991 (re)include this element. */
2992 if (abfd
->archive_pass
)
2995 /* Select the appropriate symbol table. */
2996 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2997 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2999 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3001 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3003 /* The sh_info field of the symtab header tells us where the
3004 external symbols start. We don't care about the local symbols. */
3005 if (elf_bad_symtab (abfd
))
3007 extsymcount
= symcount
;
3012 extsymcount
= symcount
- hdr
->sh_info
;
3013 extsymoff
= hdr
->sh_info
;
3016 if (extsymcount
== 0)
3019 /* Read in the symbol table. */
3020 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3022 if (isymbuf
== NULL
)
3025 /* Scan the symbol table looking for SYMDEF. */
3027 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3031 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3036 if (strcmp (name
, symdef
->name
) == 0)
3038 result
= is_global_data_symbol_definition (abfd
, isym
);
3048 /* Add an entry to the .dynamic table. */
3051 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3055 struct elf_link_hash_table
*hash_table
;
3056 const struct elf_backend_data
*bed
;
3058 bfd_size_type newsize
;
3059 bfd_byte
*newcontents
;
3060 Elf_Internal_Dyn dyn
;
3062 hash_table
= elf_hash_table (info
);
3063 if (! is_elf_hash_table (hash_table
))
3066 bed
= get_elf_backend_data (hash_table
->dynobj
);
3067 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3068 BFD_ASSERT (s
!= NULL
);
3070 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3071 newcontents
= bfd_realloc (s
->contents
, newsize
);
3072 if (newcontents
== NULL
)
3076 dyn
.d_un
.d_val
= val
;
3077 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3080 s
->contents
= newcontents
;
3085 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3086 otherwise just check whether one already exists. Returns -1 on error,
3087 1 if a DT_NEEDED tag already exists, and 0 on success. */
3090 elf_add_dt_needed_tag (bfd
*abfd
,
3091 struct bfd_link_info
*info
,
3095 struct elf_link_hash_table
*hash_table
;
3096 bfd_size_type oldsize
;
3097 bfd_size_type strindex
;
3099 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3102 hash_table
= elf_hash_table (info
);
3103 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
3104 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3105 if (strindex
== (bfd_size_type
) -1)
3108 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
3111 const struct elf_backend_data
*bed
;
3114 bed
= get_elf_backend_data (hash_table
->dynobj
);
3115 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3117 for (extdyn
= sdyn
->contents
;
3118 extdyn
< sdyn
->contents
+ sdyn
->size
;
3119 extdyn
+= bed
->s
->sizeof_dyn
)
3121 Elf_Internal_Dyn dyn
;
3123 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3124 if (dyn
.d_tag
== DT_NEEDED
3125 && dyn
.d_un
.d_val
== strindex
)
3127 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3135 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3138 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3142 /* We were just checking for existence of the tag. */
3143 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3149 on_needed_list (const char *soname
, struct bfd_link_needed_list
*needed
)
3151 for (; needed
!= NULL
; needed
= needed
->next
)
3152 if (strcmp (soname
, needed
->name
) == 0)
3158 /* Sort symbol by value and section. */
3160 elf_sort_symbol (const void *arg1
, const void *arg2
)
3162 const struct elf_link_hash_entry
*h1
;
3163 const struct elf_link_hash_entry
*h2
;
3164 bfd_signed_vma vdiff
;
3166 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3167 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3168 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3170 return vdiff
> 0 ? 1 : -1;
3173 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3175 return sdiff
> 0 ? 1 : -1;
3180 /* This function is used to adjust offsets into .dynstr for
3181 dynamic symbols. This is called via elf_link_hash_traverse. */
3184 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3186 struct elf_strtab_hash
*dynstr
= data
;
3188 if (h
->root
.type
== bfd_link_hash_warning
)
3189 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3191 if (h
->dynindx
!= -1)
3192 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3196 /* Assign string offsets in .dynstr, update all structures referencing
3200 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3202 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3203 struct elf_link_local_dynamic_entry
*entry
;
3204 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3205 bfd
*dynobj
= hash_table
->dynobj
;
3208 const struct elf_backend_data
*bed
;
3211 _bfd_elf_strtab_finalize (dynstr
);
3212 size
= _bfd_elf_strtab_size (dynstr
);
3214 bed
= get_elf_backend_data (dynobj
);
3215 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3216 BFD_ASSERT (sdyn
!= NULL
);
3218 /* Update all .dynamic entries referencing .dynstr strings. */
3219 for (extdyn
= sdyn
->contents
;
3220 extdyn
< sdyn
->contents
+ sdyn
->size
;
3221 extdyn
+= bed
->s
->sizeof_dyn
)
3223 Elf_Internal_Dyn dyn
;
3225 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3229 dyn
.d_un
.d_val
= size
;
3237 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3242 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3245 /* Now update local dynamic symbols. */
3246 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3247 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3248 entry
->isym
.st_name
);
3250 /* And the rest of dynamic symbols. */
3251 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3253 /* Adjust version definitions. */
3254 if (elf_tdata (output_bfd
)->cverdefs
)
3259 Elf_Internal_Verdef def
;
3260 Elf_Internal_Verdaux defaux
;
3262 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3266 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3268 p
+= sizeof (Elf_External_Verdef
);
3269 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3271 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3273 _bfd_elf_swap_verdaux_in (output_bfd
,
3274 (Elf_External_Verdaux
*) p
, &defaux
);
3275 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3277 _bfd_elf_swap_verdaux_out (output_bfd
,
3278 &defaux
, (Elf_External_Verdaux
*) p
);
3279 p
+= sizeof (Elf_External_Verdaux
);
3282 while (def
.vd_next
);
3285 /* Adjust version references. */
3286 if (elf_tdata (output_bfd
)->verref
)
3291 Elf_Internal_Verneed need
;
3292 Elf_Internal_Vernaux needaux
;
3294 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3298 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3300 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3301 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3302 (Elf_External_Verneed
*) p
);
3303 p
+= sizeof (Elf_External_Verneed
);
3304 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3306 _bfd_elf_swap_vernaux_in (output_bfd
,
3307 (Elf_External_Vernaux
*) p
, &needaux
);
3308 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3310 _bfd_elf_swap_vernaux_out (output_bfd
,
3312 (Elf_External_Vernaux
*) p
);
3313 p
+= sizeof (Elf_External_Vernaux
);
3316 while (need
.vn_next
);
3322 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3323 The default is to only match when the INPUT and OUTPUT are exactly
3327 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3328 const bfd_target
*output
)
3330 return input
== output
;
3333 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3334 This version is used when different targets for the same architecture
3335 are virtually identical. */
3338 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3339 const bfd_target
*output
)
3341 const struct elf_backend_data
*obed
, *ibed
;
3343 if (input
== output
)
3346 ibed
= xvec_get_elf_backend_data (input
);
3347 obed
= xvec_get_elf_backend_data (output
);
3349 if (ibed
->arch
!= obed
->arch
)
3352 /* If both backends are using this function, deem them compatible. */
3353 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3356 /* Add symbols from an ELF object file to the linker hash table. */
3359 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3361 Elf_Internal_Ehdr
*ehdr
;
3362 Elf_Internal_Shdr
*hdr
;
3363 bfd_size_type symcount
;
3364 bfd_size_type extsymcount
;
3365 bfd_size_type extsymoff
;
3366 struct elf_link_hash_entry
**sym_hash
;
3367 bfd_boolean dynamic
;
3368 Elf_External_Versym
*extversym
= NULL
;
3369 Elf_External_Versym
*ever
;
3370 struct elf_link_hash_entry
*weaks
;
3371 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3372 bfd_size_type nondeflt_vers_cnt
= 0;
3373 Elf_Internal_Sym
*isymbuf
= NULL
;
3374 Elf_Internal_Sym
*isym
;
3375 Elf_Internal_Sym
*isymend
;
3376 const struct elf_backend_data
*bed
;
3377 bfd_boolean add_needed
;
3378 struct elf_link_hash_table
*htab
;
3380 void *alloc_mark
= NULL
;
3381 struct bfd_hash_entry
**old_table
= NULL
;
3382 unsigned int old_size
= 0;
3383 unsigned int old_count
= 0;
3384 void *old_tab
= NULL
;
3387 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3388 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3389 long old_dynsymcount
= 0;
3391 size_t hashsize
= 0;
3393 htab
= elf_hash_table (info
);
3394 bed
= get_elf_backend_data (abfd
);
3396 if ((abfd
->flags
& DYNAMIC
) == 0)
3402 /* You can't use -r against a dynamic object. Also, there's no
3403 hope of using a dynamic object which does not exactly match
3404 the format of the output file. */
3405 if (info
->relocatable
3406 || !is_elf_hash_table (htab
)
3407 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3409 if (info
->relocatable
)
3410 bfd_set_error (bfd_error_invalid_operation
);
3412 bfd_set_error (bfd_error_wrong_format
);
3417 ehdr
= elf_elfheader (abfd
);
3418 if (info
->warn_alternate_em
3419 && bed
->elf_machine_code
!= ehdr
->e_machine
3420 && ((bed
->elf_machine_alt1
!= 0
3421 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3422 || (bed
->elf_machine_alt2
!= 0
3423 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3424 info
->callbacks
->einfo
3425 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3426 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3428 /* As a GNU extension, any input sections which are named
3429 .gnu.warning.SYMBOL are treated as warning symbols for the given
3430 symbol. This differs from .gnu.warning sections, which generate
3431 warnings when they are included in an output file. */
3432 if (info
->executable
)
3436 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3440 name
= bfd_get_section_name (abfd
, s
);
3441 if (CONST_STRNEQ (name
, ".gnu.warning."))
3446 name
+= sizeof ".gnu.warning." - 1;
3448 /* If this is a shared object, then look up the symbol
3449 in the hash table. If it is there, and it is already
3450 been defined, then we will not be using the entry
3451 from this shared object, so we don't need to warn.
3452 FIXME: If we see the definition in a regular object
3453 later on, we will warn, but we shouldn't. The only
3454 fix is to keep track of what warnings we are supposed
3455 to emit, and then handle them all at the end of the
3459 struct elf_link_hash_entry
*h
;
3461 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3463 /* FIXME: What about bfd_link_hash_common? */
3465 && (h
->root
.type
== bfd_link_hash_defined
3466 || h
->root
.type
== bfd_link_hash_defweak
))
3468 /* We don't want to issue this warning. Clobber
3469 the section size so that the warning does not
3470 get copied into the output file. */
3477 msg
= bfd_alloc (abfd
, sz
+ 1);
3481 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3486 if (! (_bfd_generic_link_add_one_symbol
3487 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3488 FALSE
, bed
->collect
, NULL
)))
3491 if (! info
->relocatable
)
3493 /* Clobber the section size so that the warning does
3494 not get copied into the output file. */
3497 /* Also set SEC_EXCLUDE, so that symbols defined in
3498 the warning section don't get copied to the output. */
3499 s
->flags
|= SEC_EXCLUDE
;
3508 /* If we are creating a shared library, create all the dynamic
3509 sections immediately. We need to attach them to something,
3510 so we attach them to this BFD, provided it is the right
3511 format. FIXME: If there are no input BFD's of the same
3512 format as the output, we can't make a shared library. */
3514 && is_elf_hash_table (htab
)
3515 && info
->output_bfd
->xvec
== abfd
->xvec
3516 && !htab
->dynamic_sections_created
)
3518 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3522 else if (!is_elf_hash_table (htab
))
3527 const char *soname
= NULL
;
3528 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3531 /* ld --just-symbols and dynamic objects don't mix very well.
3532 ld shouldn't allow it. */
3533 if ((s
= abfd
->sections
) != NULL
3534 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3537 /* If this dynamic lib was specified on the command line with
3538 --as-needed in effect, then we don't want to add a DT_NEEDED
3539 tag unless the lib is actually used. Similary for libs brought
3540 in by another lib's DT_NEEDED. When --no-add-needed is used
3541 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3542 any dynamic library in DT_NEEDED tags in the dynamic lib at
3544 add_needed
= (elf_dyn_lib_class (abfd
)
3545 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3546 | DYN_NO_NEEDED
)) == 0;
3548 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3553 unsigned int elfsec
;
3554 unsigned long shlink
;
3556 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3557 goto error_free_dyn
;
3559 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3560 if (elfsec
== SHN_BAD
)
3561 goto error_free_dyn
;
3562 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3564 for (extdyn
= dynbuf
;
3565 extdyn
< dynbuf
+ s
->size
;
3566 extdyn
+= bed
->s
->sizeof_dyn
)
3568 Elf_Internal_Dyn dyn
;
3570 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3571 if (dyn
.d_tag
== DT_SONAME
)
3573 unsigned int tagv
= dyn
.d_un
.d_val
;
3574 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3576 goto error_free_dyn
;
3578 if (dyn
.d_tag
== DT_NEEDED
)
3580 struct bfd_link_needed_list
*n
, **pn
;
3582 unsigned int tagv
= dyn
.d_un
.d_val
;
3584 amt
= sizeof (struct bfd_link_needed_list
);
3585 n
= bfd_alloc (abfd
, amt
);
3586 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3587 if (n
== NULL
|| fnm
== NULL
)
3588 goto error_free_dyn
;
3589 amt
= strlen (fnm
) + 1;
3590 anm
= bfd_alloc (abfd
, amt
);
3592 goto error_free_dyn
;
3593 memcpy (anm
, fnm
, amt
);
3597 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3601 if (dyn
.d_tag
== DT_RUNPATH
)
3603 struct bfd_link_needed_list
*n
, **pn
;
3605 unsigned int tagv
= dyn
.d_un
.d_val
;
3607 amt
= sizeof (struct bfd_link_needed_list
);
3608 n
= bfd_alloc (abfd
, amt
);
3609 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3610 if (n
== NULL
|| fnm
== NULL
)
3611 goto error_free_dyn
;
3612 amt
= strlen (fnm
) + 1;
3613 anm
= bfd_alloc (abfd
, amt
);
3615 goto error_free_dyn
;
3616 memcpy (anm
, fnm
, amt
);
3620 for (pn
= & runpath
;
3626 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3627 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3629 struct bfd_link_needed_list
*n
, **pn
;
3631 unsigned int tagv
= dyn
.d_un
.d_val
;
3633 amt
= sizeof (struct bfd_link_needed_list
);
3634 n
= bfd_alloc (abfd
, amt
);
3635 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3636 if (n
== NULL
|| fnm
== NULL
)
3637 goto error_free_dyn
;
3638 amt
= strlen (fnm
) + 1;
3639 anm
= bfd_alloc (abfd
, amt
);
3646 memcpy (anm
, fnm
, amt
);
3661 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3662 frees all more recently bfd_alloc'd blocks as well. */
3668 struct bfd_link_needed_list
**pn
;
3669 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3674 /* We do not want to include any of the sections in a dynamic
3675 object in the output file. We hack by simply clobbering the
3676 list of sections in the BFD. This could be handled more
3677 cleanly by, say, a new section flag; the existing
3678 SEC_NEVER_LOAD flag is not the one we want, because that one
3679 still implies that the section takes up space in the output
3681 bfd_section_list_clear (abfd
);
3683 /* Find the name to use in a DT_NEEDED entry that refers to this
3684 object. If the object has a DT_SONAME entry, we use it.
3685 Otherwise, if the generic linker stuck something in
3686 elf_dt_name, we use that. Otherwise, we just use the file
3688 if (soname
== NULL
|| *soname
== '\0')
3690 soname
= elf_dt_name (abfd
);
3691 if (soname
== NULL
|| *soname
== '\0')
3692 soname
= bfd_get_filename (abfd
);
3695 /* Save the SONAME because sometimes the linker emulation code
3696 will need to know it. */
3697 elf_dt_name (abfd
) = soname
;
3699 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3703 /* If we have already included this dynamic object in the
3704 link, just ignore it. There is no reason to include a
3705 particular dynamic object more than once. */
3710 /* If this is a dynamic object, we always link against the .dynsym
3711 symbol table, not the .symtab symbol table. The dynamic linker
3712 will only see the .dynsym symbol table, so there is no reason to
3713 look at .symtab for a dynamic object. */
3715 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3716 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3718 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3720 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3722 /* The sh_info field of the symtab header tells us where the
3723 external symbols start. We don't care about the local symbols at
3725 if (elf_bad_symtab (abfd
))
3727 extsymcount
= symcount
;
3732 extsymcount
= symcount
- hdr
->sh_info
;
3733 extsymoff
= hdr
->sh_info
;
3737 if (extsymcount
!= 0)
3739 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3741 if (isymbuf
== NULL
)
3744 /* We store a pointer to the hash table entry for each external
3746 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3747 sym_hash
= bfd_alloc (abfd
, amt
);
3748 if (sym_hash
== NULL
)
3749 goto error_free_sym
;
3750 elf_sym_hashes (abfd
) = sym_hash
;
3755 /* Read in any version definitions. */
3756 if (!_bfd_elf_slurp_version_tables (abfd
,
3757 info
->default_imported_symver
))
3758 goto error_free_sym
;
3760 /* Read in the symbol versions, but don't bother to convert them
3761 to internal format. */
3762 if (elf_dynversym (abfd
) != 0)
3764 Elf_Internal_Shdr
*versymhdr
;
3766 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3767 extversym
= bfd_malloc (versymhdr
->sh_size
);
3768 if (extversym
== NULL
)
3769 goto error_free_sym
;
3770 amt
= versymhdr
->sh_size
;
3771 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3772 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3773 goto error_free_vers
;
3777 /* If we are loading an as-needed shared lib, save the symbol table
3778 state before we start adding symbols. If the lib turns out
3779 to be unneeded, restore the state. */
3780 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
3785 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
3787 struct bfd_hash_entry
*p
;
3788 struct elf_link_hash_entry
*h
;
3790 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3792 h
= (struct elf_link_hash_entry
*) p
;
3793 entsize
+= htab
->root
.table
.entsize
;
3794 if (h
->root
.type
== bfd_link_hash_warning
)
3795 entsize
+= htab
->root
.table
.entsize
;
3799 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
3800 hashsize
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3801 old_tab
= bfd_malloc (tabsize
+ entsize
+ hashsize
);
3802 if (old_tab
== NULL
)
3803 goto error_free_vers
;
3805 /* Remember the current objalloc pointer, so that all mem for
3806 symbols added can later be reclaimed. */
3807 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
3808 if (alloc_mark
== NULL
)
3809 goto error_free_vers
;
3811 /* Make a special call to the linker "notice" function to
3812 tell it that we are about to handle an as-needed lib. */
3813 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
3815 goto error_free_vers
;
3817 /* Clone the symbol table and sym hashes. Remember some
3818 pointers into the symbol table, and dynamic symbol count. */
3819 old_hash
= (char *) old_tab
+ tabsize
;
3820 old_ent
= (char *) old_hash
+ hashsize
;
3821 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
3822 memcpy (old_hash
, sym_hash
, hashsize
);
3823 old_undefs
= htab
->root
.undefs
;
3824 old_undefs_tail
= htab
->root
.undefs_tail
;
3825 old_table
= htab
->root
.table
.table
;
3826 old_size
= htab
->root
.table
.size
;
3827 old_count
= htab
->root
.table
.count
;
3828 old_dynsymcount
= htab
->dynsymcount
;
3830 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
3832 struct bfd_hash_entry
*p
;
3833 struct elf_link_hash_entry
*h
;
3835 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3837 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
3838 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3839 h
= (struct elf_link_hash_entry
*) p
;
3840 if (h
->root
.type
== bfd_link_hash_warning
)
3842 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
3843 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3850 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3851 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3853 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3857 asection
*sec
, *new_sec
;
3860 struct elf_link_hash_entry
*h
;
3861 bfd_boolean definition
;
3862 bfd_boolean size_change_ok
;
3863 bfd_boolean type_change_ok
;
3864 bfd_boolean new_weakdef
;
3865 bfd_boolean override
;
3867 unsigned int old_alignment
;
3872 flags
= BSF_NO_FLAGS
;
3874 value
= isym
->st_value
;
3876 common
= bed
->common_definition (isym
);
3878 bind
= ELF_ST_BIND (isym
->st_info
);
3879 if (bind
== STB_LOCAL
)
3881 /* This should be impossible, since ELF requires that all
3882 global symbols follow all local symbols, and that sh_info
3883 point to the first global symbol. Unfortunately, Irix 5
3887 else if (bind
== STB_GLOBAL
)
3889 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
3892 else if (bind
== STB_WEAK
)
3896 /* Leave it up to the processor backend. */
3899 if (isym
->st_shndx
== SHN_UNDEF
)
3900 sec
= bfd_und_section_ptr
;
3901 else if (isym
->st_shndx
== SHN_ABS
)
3902 sec
= bfd_abs_section_ptr
;
3903 else if (isym
->st_shndx
== SHN_COMMON
)
3905 sec
= bfd_com_section_ptr
;
3906 /* What ELF calls the size we call the value. What ELF
3907 calls the value we call the alignment. */
3908 value
= isym
->st_size
;
3912 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3914 sec
= bfd_abs_section_ptr
;
3915 else if (sec
->kept_section
)
3917 /* Symbols from discarded section are undefined. We keep
3919 sec
= bfd_und_section_ptr
;
3920 isym
->st_shndx
= SHN_UNDEF
;
3922 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3926 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3929 goto error_free_vers
;
3931 if (isym
->st_shndx
== SHN_COMMON
3932 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
3933 && !info
->relocatable
)
3935 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3939 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon",
3942 | SEC_LINKER_CREATED
3943 | SEC_THREAD_LOCAL
));
3945 goto error_free_vers
;
3949 else if (bed
->elf_add_symbol_hook
)
3951 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
3953 goto error_free_vers
;
3955 /* The hook function sets the name to NULL if this symbol
3956 should be skipped for some reason. */
3961 /* Sanity check that all possibilities were handled. */
3964 bfd_set_error (bfd_error_bad_value
);
3965 goto error_free_vers
;
3968 if (bfd_is_und_section (sec
)
3969 || bfd_is_com_section (sec
))
3974 size_change_ok
= FALSE
;
3975 type_change_ok
= bed
->type_change_ok
;
3980 if (is_elf_hash_table (htab
))
3982 Elf_Internal_Versym iver
;
3983 unsigned int vernum
= 0;
3988 if (info
->default_imported_symver
)
3989 /* Use the default symbol version created earlier. */
3990 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
3995 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
3997 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
3999 /* If this is a hidden symbol, or if it is not version
4000 1, we append the version name to the symbol name.
4001 However, we do not modify a non-hidden absolute symbol
4002 if it is not a function, because it might be the version
4003 symbol itself. FIXME: What if it isn't? */
4004 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4006 && (!bfd_is_abs_section (sec
)
4007 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4010 size_t namelen
, verlen
, newlen
;
4013 if (isym
->st_shndx
!= SHN_UNDEF
)
4015 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4017 else if (vernum
> 1)
4019 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4025 (*_bfd_error_handler
)
4026 (_("%B: %s: invalid version %u (max %d)"),
4028 elf_tdata (abfd
)->cverdefs
);
4029 bfd_set_error (bfd_error_bad_value
);
4030 goto error_free_vers
;
4035 /* We cannot simply test for the number of
4036 entries in the VERNEED section since the
4037 numbers for the needed versions do not start
4039 Elf_Internal_Verneed
*t
;
4042 for (t
= elf_tdata (abfd
)->verref
;
4046 Elf_Internal_Vernaux
*a
;
4048 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4050 if (a
->vna_other
== vernum
)
4052 verstr
= a
->vna_nodename
;
4061 (*_bfd_error_handler
)
4062 (_("%B: %s: invalid needed version %d"),
4063 abfd
, name
, vernum
);
4064 bfd_set_error (bfd_error_bad_value
);
4065 goto error_free_vers
;
4069 namelen
= strlen (name
);
4070 verlen
= strlen (verstr
);
4071 newlen
= namelen
+ verlen
+ 2;
4072 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4073 && isym
->st_shndx
!= SHN_UNDEF
)
4076 newname
= bfd_hash_allocate (&htab
->root
.table
, newlen
);
4077 if (newname
== NULL
)
4078 goto error_free_vers
;
4079 memcpy (newname
, name
, namelen
);
4080 p
= newname
+ namelen
;
4082 /* If this is a defined non-hidden version symbol,
4083 we add another @ to the name. This indicates the
4084 default version of the symbol. */
4085 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4086 && isym
->st_shndx
!= SHN_UNDEF
)
4088 memcpy (p
, verstr
, verlen
+ 1);
4093 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
,
4094 &value
, &old_alignment
,
4095 sym_hash
, &skip
, &override
,
4096 &type_change_ok
, &size_change_ok
))
4097 goto error_free_vers
;
4106 while (h
->root
.type
== bfd_link_hash_indirect
4107 || h
->root
.type
== bfd_link_hash_warning
)
4108 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4110 /* Remember the old alignment if this is a common symbol, so
4111 that we don't reduce the alignment later on. We can't
4112 check later, because _bfd_generic_link_add_one_symbol
4113 will set a default for the alignment which we want to
4114 override. We also remember the old bfd where the existing
4115 definition comes from. */
4116 switch (h
->root
.type
)
4121 case bfd_link_hash_defined
:
4122 case bfd_link_hash_defweak
:
4123 old_bfd
= h
->root
.u
.def
.section
->owner
;
4126 case bfd_link_hash_common
:
4127 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
4128 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
4132 if (elf_tdata (abfd
)->verdef
!= NULL
4136 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4139 if (! (_bfd_generic_link_add_one_symbol
4140 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4141 (struct bfd_link_hash_entry
**) sym_hash
)))
4142 goto error_free_vers
;
4145 while (h
->root
.type
== bfd_link_hash_indirect
4146 || h
->root
.type
== bfd_link_hash_warning
)
4147 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4150 new_weakdef
= FALSE
;
4153 && (flags
& BSF_WEAK
) != 0
4154 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4155 && is_elf_hash_table (htab
)
4156 && h
->u
.weakdef
== NULL
)
4158 /* Keep a list of all weak defined non function symbols from
4159 a dynamic object, using the weakdef field. Later in this
4160 function we will set the weakdef field to the correct
4161 value. We only put non-function symbols from dynamic
4162 objects on this list, because that happens to be the only
4163 time we need to know the normal symbol corresponding to a
4164 weak symbol, and the information is time consuming to
4165 figure out. If the weakdef field is not already NULL,
4166 then this symbol was already defined by some previous
4167 dynamic object, and we will be using that previous
4168 definition anyhow. */
4170 h
->u
.weakdef
= weaks
;
4175 /* Set the alignment of a common symbol. */
4176 if ((common
|| bfd_is_com_section (sec
))
4177 && h
->root
.type
== bfd_link_hash_common
)
4182 align
= bfd_log2 (isym
->st_value
);
4185 /* The new symbol is a common symbol in a shared object.
4186 We need to get the alignment from the section. */
4187 align
= new_sec
->alignment_power
;
4189 if (align
> old_alignment
4190 /* Permit an alignment power of zero if an alignment of one
4191 is specified and no other alignments have been specified. */
4192 || (isym
->st_value
== 1 && old_alignment
== 0))
4193 h
->root
.u
.c
.p
->alignment_power
= align
;
4195 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4198 if (is_elf_hash_table (htab
))
4202 /* Check the alignment when a common symbol is involved. This
4203 can change when a common symbol is overridden by a normal
4204 definition or a common symbol is ignored due to the old
4205 normal definition. We need to make sure the maximum
4206 alignment is maintained. */
4207 if ((old_alignment
|| common
)
4208 && h
->root
.type
!= bfd_link_hash_common
)
4210 unsigned int common_align
;
4211 unsigned int normal_align
;
4212 unsigned int symbol_align
;
4216 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4217 if (h
->root
.u
.def
.section
->owner
!= NULL
4218 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
4220 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4221 if (normal_align
> symbol_align
)
4222 normal_align
= symbol_align
;
4225 normal_align
= symbol_align
;
4229 common_align
= old_alignment
;
4230 common_bfd
= old_bfd
;
4235 common_align
= bfd_log2 (isym
->st_value
);
4237 normal_bfd
= old_bfd
;
4240 if (normal_align
< common_align
)
4242 /* PR binutils/2735 */
4243 if (normal_bfd
== NULL
)
4244 (*_bfd_error_handler
)
4245 (_("Warning: alignment %u of common symbol `%s' in %B"
4246 " is greater than the alignment (%u) of its section %A"),
4247 common_bfd
, h
->root
.u
.def
.section
,
4248 1 << common_align
, name
, 1 << normal_align
);
4250 (*_bfd_error_handler
)
4251 (_("Warning: alignment %u of symbol `%s' in %B"
4252 " is smaller than %u in %B"),
4253 normal_bfd
, common_bfd
,
4254 1 << normal_align
, name
, 1 << common_align
);
4258 /* Remember the symbol size if it isn't undefined. */
4259 if ((isym
->st_size
!= 0 && isym
->st_shndx
!= SHN_UNDEF
)
4260 && (definition
|| h
->size
== 0))
4263 && h
->size
!= isym
->st_size
4264 && ! size_change_ok
)
4265 (*_bfd_error_handler
)
4266 (_("Warning: size of symbol `%s' changed"
4267 " from %lu in %B to %lu in %B"),
4269 name
, (unsigned long) h
->size
,
4270 (unsigned long) isym
->st_size
);
4272 h
->size
= isym
->st_size
;
4275 /* If this is a common symbol, then we always want H->SIZE
4276 to be the size of the common symbol. The code just above
4277 won't fix the size if a common symbol becomes larger. We
4278 don't warn about a size change here, because that is
4279 covered by --warn-common. Allow changed between different
4281 if (h
->root
.type
== bfd_link_hash_common
)
4282 h
->size
= h
->root
.u
.c
.size
;
4284 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4285 && (definition
|| h
->type
== STT_NOTYPE
))
4287 if (h
->type
!= STT_NOTYPE
4288 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
4289 && ! type_change_ok
)
4290 (*_bfd_error_handler
)
4291 (_("Warning: type of symbol `%s' changed"
4292 " from %d to %d in %B"),
4293 abfd
, name
, h
->type
, ELF_ST_TYPE (isym
->st_info
));
4295 h
->type
= ELF_ST_TYPE (isym
->st_info
);
4298 /* Merge st_other field. */
4299 elf_merge_st_other (abfd
, h
, isym
, definition
, dynamic
);
4301 /* Set a flag in the hash table entry indicating the type of
4302 reference or definition we just found. Keep a count of
4303 the number of dynamic symbols we find. A dynamic symbol
4304 is one which is referenced or defined by both a regular
4305 object and a shared object. */
4312 if (bind
!= STB_WEAK
)
4313 h
->ref_regular_nonweak
= 1;
4325 if (! info
->executable
4338 || (h
->u
.weakdef
!= NULL
4340 && h
->u
.weakdef
->dynindx
!= -1))
4344 if (definition
&& (sec
->flags
& SEC_DEBUGGING
) && !info
->relocatable
)
4346 /* We don't want to make debug symbol dynamic. */
4347 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4351 /* Check to see if we need to add an indirect symbol for
4352 the default name. */
4353 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
4354 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4355 &sec
, &value
, &dynsym
,
4357 goto error_free_vers
;
4359 if (definition
&& !dynamic
)
4361 char *p
= strchr (name
, ELF_VER_CHR
);
4362 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4364 /* Queue non-default versions so that .symver x, x@FOO
4365 aliases can be checked. */
4368 amt
= ((isymend
- isym
+ 1)
4369 * sizeof (struct elf_link_hash_entry
*));
4370 nondeflt_vers
= bfd_malloc (amt
);
4372 goto error_free_vers
;
4374 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4378 if (dynsym
&& h
->dynindx
== -1)
4380 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4381 goto error_free_vers
;
4382 if (h
->u
.weakdef
!= NULL
4384 && h
->u
.weakdef
->dynindx
== -1)
4386 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4387 goto error_free_vers
;
4390 else if (dynsym
&& h
->dynindx
!= -1)
4391 /* If the symbol already has a dynamic index, but
4392 visibility says it should not be visible, turn it into
4394 switch (ELF_ST_VISIBILITY (h
->other
))
4398 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4408 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
4409 && !on_needed_list (elf_dt_name (abfd
), htab
->needed
))))
4412 const char *soname
= elf_dt_name (abfd
);
4414 /* A symbol from a library loaded via DT_NEEDED of some
4415 other library is referenced by a regular object.
4416 Add a DT_NEEDED entry for it. Issue an error if
4417 --no-add-needed is used. */
4418 if ((elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4420 (*_bfd_error_handler
)
4421 (_("%s: invalid DSO for symbol `%s' definition"),
4423 bfd_set_error (bfd_error_bad_value
);
4424 goto error_free_vers
;
4427 elf_dyn_lib_class (abfd
) &= ~DYN_AS_NEEDED
;
4430 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4432 goto error_free_vers
;
4434 BFD_ASSERT (ret
== 0);
4439 if (extversym
!= NULL
)
4445 if (isymbuf
!= NULL
)
4451 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4455 /* Restore the symbol table. */
4456 if (bed
->as_needed_cleanup
)
4457 (*bed
->as_needed_cleanup
) (abfd
, info
);
4458 old_hash
= (char *) old_tab
+ tabsize
;
4459 old_ent
= (char *) old_hash
+ hashsize
;
4460 sym_hash
= elf_sym_hashes (abfd
);
4461 htab
->root
.table
.table
= old_table
;
4462 htab
->root
.table
.size
= old_size
;
4463 htab
->root
.table
.count
= old_count
;
4464 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4465 memcpy (sym_hash
, old_hash
, hashsize
);
4466 htab
->root
.undefs
= old_undefs
;
4467 htab
->root
.undefs_tail
= old_undefs_tail
;
4468 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4470 struct bfd_hash_entry
*p
;
4471 struct elf_link_hash_entry
*h
;
4473 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4475 h
= (struct elf_link_hash_entry
*) p
;
4476 if (h
->root
.type
== bfd_link_hash_warning
)
4477 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4478 if (h
->dynindx
>= old_dynsymcount
)
4479 _bfd_elf_strtab_delref (htab
->dynstr
, h
->dynstr_index
);
4481 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4482 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4483 h
= (struct elf_link_hash_entry
*) p
;
4484 if (h
->root
.type
== bfd_link_hash_warning
)
4486 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4487 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4492 /* Make a special call to the linker "notice" function to
4493 tell it that symbols added for crefs may need to be removed. */
4494 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4496 goto error_free_vers
;
4499 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4501 if (nondeflt_vers
!= NULL
)
4502 free (nondeflt_vers
);
4506 if (old_tab
!= NULL
)
4508 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4510 goto error_free_vers
;
4515 /* Now that all the symbols from this input file are created, handle
4516 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4517 if (nondeflt_vers
!= NULL
)
4519 bfd_size_type cnt
, symidx
;
4521 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4523 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4524 char *shortname
, *p
;
4526 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4528 || (h
->root
.type
!= bfd_link_hash_defined
4529 && h
->root
.type
!= bfd_link_hash_defweak
))
4532 amt
= p
- h
->root
.root
.string
;
4533 shortname
= bfd_malloc (amt
+ 1);
4535 goto error_free_vers
;
4536 memcpy (shortname
, h
->root
.root
.string
, amt
);
4537 shortname
[amt
] = '\0';
4539 hi
= (struct elf_link_hash_entry
*)
4540 bfd_link_hash_lookup (&htab
->root
, shortname
,
4541 FALSE
, FALSE
, FALSE
);
4543 && hi
->root
.type
== h
->root
.type
4544 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4545 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4547 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4548 hi
->root
.type
= bfd_link_hash_indirect
;
4549 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4550 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4551 sym_hash
= elf_sym_hashes (abfd
);
4553 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4554 if (sym_hash
[symidx
] == hi
)
4556 sym_hash
[symidx
] = h
;
4562 free (nondeflt_vers
);
4563 nondeflt_vers
= NULL
;
4566 /* Now set the weakdefs field correctly for all the weak defined
4567 symbols we found. The only way to do this is to search all the
4568 symbols. Since we only need the information for non functions in
4569 dynamic objects, that's the only time we actually put anything on
4570 the list WEAKS. We need this information so that if a regular
4571 object refers to a symbol defined weakly in a dynamic object, the
4572 real symbol in the dynamic object is also put in the dynamic
4573 symbols; we also must arrange for both symbols to point to the
4574 same memory location. We could handle the general case of symbol
4575 aliasing, but a general symbol alias can only be generated in
4576 assembler code, handling it correctly would be very time
4577 consuming, and other ELF linkers don't handle general aliasing
4581 struct elf_link_hash_entry
**hpp
;
4582 struct elf_link_hash_entry
**hppend
;
4583 struct elf_link_hash_entry
**sorted_sym_hash
;
4584 struct elf_link_hash_entry
*h
;
4587 /* Since we have to search the whole symbol list for each weak
4588 defined symbol, search time for N weak defined symbols will be
4589 O(N^2). Binary search will cut it down to O(NlogN). */
4590 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4591 sorted_sym_hash
= bfd_malloc (amt
);
4592 if (sorted_sym_hash
== NULL
)
4594 sym_hash
= sorted_sym_hash
;
4595 hpp
= elf_sym_hashes (abfd
);
4596 hppend
= hpp
+ extsymcount
;
4598 for (; hpp
< hppend
; hpp
++)
4602 && h
->root
.type
== bfd_link_hash_defined
4603 && !bed
->is_function_type (h
->type
))
4611 qsort (sorted_sym_hash
, sym_count
,
4612 sizeof (struct elf_link_hash_entry
*),
4615 while (weaks
!= NULL
)
4617 struct elf_link_hash_entry
*hlook
;
4624 weaks
= hlook
->u
.weakdef
;
4625 hlook
->u
.weakdef
= NULL
;
4627 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4628 || hlook
->root
.type
== bfd_link_hash_defweak
4629 || hlook
->root
.type
== bfd_link_hash_common
4630 || hlook
->root
.type
== bfd_link_hash_indirect
);
4631 slook
= hlook
->root
.u
.def
.section
;
4632 vlook
= hlook
->root
.u
.def
.value
;
4639 bfd_signed_vma vdiff
;
4641 h
= sorted_sym_hash
[idx
];
4642 vdiff
= vlook
- h
->root
.u
.def
.value
;
4649 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4662 /* We didn't find a value/section match. */
4666 for (i
= ilook
; i
< sym_count
; i
++)
4668 h
= sorted_sym_hash
[i
];
4670 /* Stop if value or section doesn't match. */
4671 if (h
->root
.u
.def
.value
!= vlook
4672 || h
->root
.u
.def
.section
!= slook
)
4674 else if (h
!= hlook
)
4676 hlook
->u
.weakdef
= h
;
4678 /* If the weak definition is in the list of dynamic
4679 symbols, make sure the real definition is put
4681 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4683 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4686 free (sorted_sym_hash
);
4691 /* If the real definition is in the list of dynamic
4692 symbols, make sure the weak definition is put
4693 there as well. If we don't do this, then the
4694 dynamic loader might not merge the entries for the
4695 real definition and the weak definition. */
4696 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4698 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4699 goto err_free_sym_hash
;
4706 free (sorted_sym_hash
);
4709 if (bed
->check_directives
4710 && !(*bed
->check_directives
) (abfd
, info
))
4713 /* If this object is the same format as the output object, and it is
4714 not a shared library, then let the backend look through the
4717 This is required to build global offset table entries and to
4718 arrange for dynamic relocs. It is not required for the
4719 particular common case of linking non PIC code, even when linking
4720 against shared libraries, but unfortunately there is no way of
4721 knowing whether an object file has been compiled PIC or not.
4722 Looking through the relocs is not particularly time consuming.
4723 The problem is that we must either (1) keep the relocs in memory,
4724 which causes the linker to require additional runtime memory or
4725 (2) read the relocs twice from the input file, which wastes time.
4726 This would be a good case for using mmap.
4728 I have no idea how to handle linking PIC code into a file of a
4729 different format. It probably can't be done. */
4731 && is_elf_hash_table (htab
)
4732 && bed
->check_relocs
!= NULL
4733 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4737 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4739 Elf_Internal_Rela
*internal_relocs
;
4742 if ((o
->flags
& SEC_RELOC
) == 0
4743 || o
->reloc_count
== 0
4744 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4745 && (o
->flags
& SEC_DEBUGGING
) != 0)
4746 || bfd_is_abs_section (o
->output_section
))
4749 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4751 if (internal_relocs
== NULL
)
4754 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4756 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4757 free (internal_relocs
);
4764 /* If this is a non-traditional link, try to optimize the handling
4765 of the .stab/.stabstr sections. */
4767 && ! info
->traditional_format
4768 && is_elf_hash_table (htab
)
4769 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4773 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4774 if (stabstr
!= NULL
)
4776 bfd_size_type string_offset
= 0;
4779 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4780 if (CONST_STRNEQ (stab
->name
, ".stab")
4781 && (!stab
->name
[5] ||
4782 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4783 && (stab
->flags
& SEC_MERGE
) == 0
4784 && !bfd_is_abs_section (stab
->output_section
))
4786 struct bfd_elf_section_data
*secdata
;
4788 secdata
= elf_section_data (stab
);
4789 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
4790 stabstr
, &secdata
->sec_info
,
4793 if (secdata
->sec_info
)
4794 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4799 if (is_elf_hash_table (htab
) && add_needed
)
4801 /* Add this bfd to the loaded list. */
4802 struct elf_link_loaded_list
*n
;
4804 n
= bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4808 n
->next
= htab
->loaded
;
4815 if (old_tab
!= NULL
)
4817 if (nondeflt_vers
!= NULL
)
4818 free (nondeflt_vers
);
4819 if (extversym
!= NULL
)
4822 if (isymbuf
!= NULL
)
4828 /* Return the linker hash table entry of a symbol that might be
4829 satisfied by an archive symbol. Return -1 on error. */
4831 struct elf_link_hash_entry
*
4832 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4833 struct bfd_link_info
*info
,
4836 struct elf_link_hash_entry
*h
;
4840 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4844 /* If this is a default version (the name contains @@), look up the
4845 symbol again with only one `@' as well as without the version.
4846 The effect is that references to the symbol with and without the
4847 version will be matched by the default symbol in the archive. */
4849 p
= strchr (name
, ELF_VER_CHR
);
4850 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4853 /* First check with only one `@'. */
4854 len
= strlen (name
);
4855 copy
= bfd_alloc (abfd
, len
);
4857 return (struct elf_link_hash_entry
*) 0 - 1;
4859 first
= p
- name
+ 1;
4860 memcpy (copy
, name
, first
);
4861 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4863 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4866 /* We also need to check references to the symbol without the
4868 copy
[first
- 1] = '\0';
4869 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4870 FALSE
, FALSE
, FALSE
);
4873 bfd_release (abfd
, copy
);
4877 /* Add symbols from an ELF archive file to the linker hash table. We
4878 don't use _bfd_generic_link_add_archive_symbols because of a
4879 problem which arises on UnixWare. The UnixWare libc.so is an
4880 archive which includes an entry libc.so.1 which defines a bunch of
4881 symbols. The libc.so archive also includes a number of other
4882 object files, which also define symbols, some of which are the same
4883 as those defined in libc.so.1. Correct linking requires that we
4884 consider each object file in turn, and include it if it defines any
4885 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4886 this; it looks through the list of undefined symbols, and includes
4887 any object file which defines them. When this algorithm is used on
4888 UnixWare, it winds up pulling in libc.so.1 early and defining a
4889 bunch of symbols. This means that some of the other objects in the
4890 archive are not included in the link, which is incorrect since they
4891 precede libc.so.1 in the archive.
4893 Fortunately, ELF archive handling is simpler than that done by
4894 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4895 oddities. In ELF, if we find a symbol in the archive map, and the
4896 symbol is currently undefined, we know that we must pull in that
4899 Unfortunately, we do have to make multiple passes over the symbol
4900 table until nothing further is resolved. */
4903 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4906 bfd_boolean
*defined
= NULL
;
4907 bfd_boolean
*included
= NULL
;
4911 const struct elf_backend_data
*bed
;
4912 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4913 (bfd
*, struct bfd_link_info
*, const char *);
4915 if (! bfd_has_map (abfd
))
4917 /* An empty archive is a special case. */
4918 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4920 bfd_set_error (bfd_error_no_armap
);
4924 /* Keep track of all symbols we know to be already defined, and all
4925 files we know to be already included. This is to speed up the
4926 second and subsequent passes. */
4927 c
= bfd_ardata (abfd
)->symdef_count
;
4931 amt
*= sizeof (bfd_boolean
);
4932 defined
= bfd_zmalloc (amt
);
4933 included
= bfd_zmalloc (amt
);
4934 if (defined
== NULL
|| included
== NULL
)
4937 symdefs
= bfd_ardata (abfd
)->symdefs
;
4938 bed
= get_elf_backend_data (abfd
);
4939 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
4952 symdefend
= symdef
+ c
;
4953 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
4955 struct elf_link_hash_entry
*h
;
4957 struct bfd_link_hash_entry
*undefs_tail
;
4960 if (defined
[i
] || included
[i
])
4962 if (symdef
->file_offset
== last
)
4968 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
4969 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
4975 if (h
->root
.type
== bfd_link_hash_common
)
4977 /* We currently have a common symbol. The archive map contains
4978 a reference to this symbol, so we may want to include it. We
4979 only want to include it however, if this archive element
4980 contains a definition of the symbol, not just another common
4983 Unfortunately some archivers (including GNU ar) will put
4984 declarations of common symbols into their archive maps, as
4985 well as real definitions, so we cannot just go by the archive
4986 map alone. Instead we must read in the element's symbol
4987 table and check that to see what kind of symbol definition
4989 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
4992 else if (h
->root
.type
!= bfd_link_hash_undefined
)
4994 if (h
->root
.type
!= bfd_link_hash_undefweak
)
4999 /* We need to include this archive member. */
5000 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5001 if (element
== NULL
)
5004 if (! bfd_check_format (element
, bfd_object
))
5007 /* Doublecheck that we have not included this object
5008 already--it should be impossible, but there may be
5009 something wrong with the archive. */
5010 if (element
->archive_pass
!= 0)
5012 bfd_set_error (bfd_error_bad_value
);
5015 element
->archive_pass
= 1;
5017 undefs_tail
= info
->hash
->undefs_tail
;
5019 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
5022 if (! bfd_link_add_symbols (element
, info
))
5025 /* If there are any new undefined symbols, we need to make
5026 another pass through the archive in order to see whether
5027 they can be defined. FIXME: This isn't perfect, because
5028 common symbols wind up on undefs_tail and because an
5029 undefined symbol which is defined later on in this pass
5030 does not require another pass. This isn't a bug, but it
5031 does make the code less efficient than it could be. */
5032 if (undefs_tail
!= info
->hash
->undefs_tail
)
5035 /* Look backward to mark all symbols from this object file
5036 which we have already seen in this pass. */
5040 included
[mark
] = TRUE
;
5045 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5047 /* We mark subsequent symbols from this object file as we go
5048 on through the loop. */
5049 last
= symdef
->file_offset
;
5060 if (defined
!= NULL
)
5062 if (included
!= NULL
)
5067 /* Given an ELF BFD, add symbols to the global hash table as
5071 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5073 switch (bfd_get_format (abfd
))
5076 return elf_link_add_object_symbols (abfd
, info
);
5078 return elf_link_add_archive_symbols (abfd
, info
);
5080 bfd_set_error (bfd_error_wrong_format
);
5085 struct hash_codes_info
5087 unsigned long *hashcodes
;
5091 /* This function will be called though elf_link_hash_traverse to store
5092 all hash value of the exported symbols in an array. */
5095 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5097 struct hash_codes_info
*inf
= data
;
5103 if (h
->root
.type
== bfd_link_hash_warning
)
5104 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5106 /* Ignore indirect symbols. These are added by the versioning code. */
5107 if (h
->dynindx
== -1)
5110 name
= h
->root
.root
.string
;
5111 p
= strchr (name
, ELF_VER_CHR
);
5114 alc
= bfd_malloc (p
- name
+ 1);
5120 memcpy (alc
, name
, p
- name
);
5121 alc
[p
- name
] = '\0';
5125 /* Compute the hash value. */
5126 ha
= bfd_elf_hash (name
);
5128 /* Store the found hash value in the array given as the argument. */
5129 *(inf
->hashcodes
)++ = ha
;
5131 /* And store it in the struct so that we can put it in the hash table
5133 h
->u
.elf_hash_value
= ha
;
5141 struct collect_gnu_hash_codes
5144 const struct elf_backend_data
*bed
;
5145 unsigned long int nsyms
;
5146 unsigned long int maskbits
;
5147 unsigned long int *hashcodes
;
5148 unsigned long int *hashval
;
5149 unsigned long int *indx
;
5150 unsigned long int *counts
;
5153 long int min_dynindx
;
5154 unsigned long int bucketcount
;
5155 unsigned long int symindx
;
5156 long int local_indx
;
5157 long int shift1
, shift2
;
5158 unsigned long int mask
;
5162 /* This function will be called though elf_link_hash_traverse to store
5163 all hash value of the exported symbols in an array. */
5166 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5168 struct collect_gnu_hash_codes
*s
= data
;
5174 if (h
->root
.type
== bfd_link_hash_warning
)
5175 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5177 /* Ignore indirect symbols. These are added by the versioning code. */
5178 if (h
->dynindx
== -1)
5181 /* Ignore also local symbols and undefined symbols. */
5182 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5185 name
= h
->root
.root
.string
;
5186 p
= strchr (name
, ELF_VER_CHR
);
5189 alc
= bfd_malloc (p
- name
+ 1);
5195 memcpy (alc
, name
, p
- name
);
5196 alc
[p
- name
] = '\0';
5200 /* Compute the hash value. */
5201 ha
= bfd_elf_gnu_hash (name
);
5203 /* Store the found hash value in the array for compute_bucket_count,
5204 and also for .dynsym reordering purposes. */
5205 s
->hashcodes
[s
->nsyms
] = ha
;
5206 s
->hashval
[h
->dynindx
] = ha
;
5208 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5209 s
->min_dynindx
= h
->dynindx
;
5217 /* This function will be called though elf_link_hash_traverse to do
5218 final dynaminc symbol renumbering. */
5221 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5223 struct collect_gnu_hash_codes
*s
= data
;
5224 unsigned long int bucket
;
5225 unsigned long int val
;
5227 if (h
->root
.type
== bfd_link_hash_warning
)
5228 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5230 /* Ignore indirect symbols. */
5231 if (h
->dynindx
== -1)
5234 /* Ignore also local symbols and undefined symbols. */
5235 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5237 if (h
->dynindx
>= s
->min_dynindx
)
5238 h
->dynindx
= s
->local_indx
++;
5242 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5243 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5244 & ((s
->maskbits
>> s
->shift1
) - 1);
5245 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5247 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5248 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5249 if (s
->counts
[bucket
] == 1)
5250 /* Last element terminates the chain. */
5252 bfd_put_32 (s
->output_bfd
, val
,
5253 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5254 --s
->counts
[bucket
];
5255 h
->dynindx
= s
->indx
[bucket
]++;
5259 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5262 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5264 return !(h
->forced_local
5265 || h
->root
.type
== bfd_link_hash_undefined
5266 || h
->root
.type
== bfd_link_hash_undefweak
5267 || ((h
->root
.type
== bfd_link_hash_defined
5268 || h
->root
.type
== bfd_link_hash_defweak
)
5269 && h
->root
.u
.def
.section
->output_section
== NULL
));
5272 /* Array used to determine the number of hash table buckets to use
5273 based on the number of symbols there are. If there are fewer than
5274 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5275 fewer than 37 we use 17 buckets, and so forth. We never use more
5276 than 32771 buckets. */
5278 static const size_t elf_buckets
[] =
5280 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5284 /* Compute bucket count for hashing table. We do not use a static set
5285 of possible tables sizes anymore. Instead we determine for all
5286 possible reasonable sizes of the table the outcome (i.e., the
5287 number of collisions etc) and choose the best solution. The
5288 weighting functions are not too simple to allow the table to grow
5289 without bounds. Instead one of the weighting factors is the size.
5290 Therefore the result is always a good payoff between few collisions
5291 (= short chain lengths) and table size. */
5293 compute_bucket_count (struct bfd_link_info
*info
,
5294 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5295 unsigned long int nsyms
,
5298 size_t best_size
= 0;
5299 unsigned long int i
;
5301 /* We have a problem here. The following code to optimize the table
5302 size requires an integer type with more the 32 bits. If
5303 BFD_HOST_U_64_BIT is set we know about such a type. */
5304 #ifdef BFD_HOST_U_64_BIT
5309 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5310 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5311 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5312 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5313 unsigned long int *counts
;
5316 /* Possible optimization parameters: if we have NSYMS symbols we say
5317 that the hashing table must at least have NSYMS/4 and at most
5319 minsize
= nsyms
/ 4;
5322 best_size
= maxsize
= nsyms
* 2;
5327 if ((best_size
& 31) == 0)
5331 /* Create array where we count the collisions in. We must use bfd_malloc
5332 since the size could be large. */
5334 amt
*= sizeof (unsigned long int);
5335 counts
= bfd_malloc (amt
);
5339 /* Compute the "optimal" size for the hash table. The criteria is a
5340 minimal chain length. The minor criteria is (of course) the size
5342 for (i
= minsize
; i
< maxsize
; ++i
)
5344 /* Walk through the array of hashcodes and count the collisions. */
5345 BFD_HOST_U_64_BIT max
;
5346 unsigned long int j
;
5347 unsigned long int fact
;
5349 if (gnu_hash
&& (i
& 31) == 0)
5352 memset (counts
, '\0', i
* sizeof (unsigned long int));
5354 /* Determine how often each hash bucket is used. */
5355 for (j
= 0; j
< nsyms
; ++j
)
5356 ++counts
[hashcodes
[j
] % i
];
5358 /* For the weight function we need some information about the
5359 pagesize on the target. This is information need not be 100%
5360 accurate. Since this information is not available (so far) we
5361 define it here to a reasonable default value. If it is crucial
5362 to have a better value some day simply define this value. */
5363 # ifndef BFD_TARGET_PAGESIZE
5364 # define BFD_TARGET_PAGESIZE (4096)
5367 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5369 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5372 /* Variant 1: optimize for short chains. We add the squares
5373 of all the chain lengths (which favors many small chain
5374 over a few long chains). */
5375 for (j
= 0; j
< i
; ++j
)
5376 max
+= counts
[j
] * counts
[j
];
5378 /* This adds penalties for the overall size of the table. */
5379 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5382 /* Variant 2: Optimize a lot more for small table. Here we
5383 also add squares of the size but we also add penalties for
5384 empty slots (the +1 term). */
5385 for (j
= 0; j
< i
; ++j
)
5386 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5388 /* The overall size of the table is considered, but not as
5389 strong as in variant 1, where it is squared. */
5390 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5394 /* Compare with current best results. */
5395 if (max
< best_chlen
)
5405 #endif /* defined (BFD_HOST_U_64_BIT) */
5407 /* This is the fallback solution if no 64bit type is available or if we
5408 are not supposed to spend much time on optimizations. We select the
5409 bucket count using a fixed set of numbers. */
5410 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5412 best_size
= elf_buckets
[i
];
5413 if (nsyms
< elf_buckets
[i
+ 1])
5416 if (gnu_hash
&& best_size
< 2)
5423 /* Set up the sizes and contents of the ELF dynamic sections. This is
5424 called by the ELF linker emulation before_allocation routine. We
5425 must set the sizes of the sections before the linker sets the
5426 addresses of the various sections. */
5429 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5432 const char *filter_shlib
,
5433 const char * const *auxiliary_filters
,
5434 struct bfd_link_info
*info
,
5435 asection
**sinterpptr
,
5436 struct bfd_elf_version_tree
*verdefs
)
5438 bfd_size_type soname_indx
;
5440 const struct elf_backend_data
*bed
;
5441 struct elf_info_failed asvinfo
;
5445 soname_indx
= (bfd_size_type
) -1;
5447 if (!is_elf_hash_table (info
->hash
))
5450 bed
= get_elf_backend_data (output_bfd
);
5451 if (info
->execstack
)
5452 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
5453 else if (info
->noexecstack
)
5454 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
5458 asection
*notesec
= NULL
;
5461 for (inputobj
= info
->input_bfds
;
5463 inputobj
= inputobj
->link_next
)
5467 if (inputobj
->flags
& (DYNAMIC
| EXEC_P
| BFD_LINKER_CREATED
))
5469 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5472 if (s
->flags
& SEC_CODE
)
5476 else if (bed
->default_execstack
)
5481 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
5482 if (exec
&& info
->relocatable
5483 && notesec
->output_section
!= bfd_abs_section_ptr
)
5484 notesec
->output_section
->flags
|= SEC_CODE
;
5488 /* Any syms created from now on start with -1 in
5489 got.refcount/offset and plt.refcount/offset. */
5490 elf_hash_table (info
)->init_got_refcount
5491 = elf_hash_table (info
)->init_got_offset
;
5492 elf_hash_table (info
)->init_plt_refcount
5493 = elf_hash_table (info
)->init_plt_offset
;
5495 /* The backend may have to create some sections regardless of whether
5496 we're dynamic or not. */
5497 if (bed
->elf_backend_always_size_sections
5498 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5501 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
5504 dynobj
= elf_hash_table (info
)->dynobj
;
5506 /* If there were no dynamic objects in the link, there is nothing to
5511 if (elf_hash_table (info
)->dynamic_sections_created
)
5513 struct elf_info_failed eif
;
5514 struct elf_link_hash_entry
*h
;
5516 struct bfd_elf_version_tree
*t
;
5517 struct bfd_elf_version_expr
*d
;
5519 bfd_boolean all_defined
;
5521 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
5522 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
5526 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5528 if (soname_indx
== (bfd_size_type
) -1
5529 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5535 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5537 info
->flags
|= DF_SYMBOLIC
;
5544 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5546 if (indx
== (bfd_size_type
) -1
5547 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
5550 if (info
->new_dtags
)
5552 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
5553 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
5558 if (filter_shlib
!= NULL
)
5562 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5563 filter_shlib
, TRUE
);
5564 if (indx
== (bfd_size_type
) -1
5565 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5569 if (auxiliary_filters
!= NULL
)
5571 const char * const *p
;
5573 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5577 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5579 if (indx
== (bfd_size_type
) -1
5580 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5586 eif
.verdefs
= verdefs
;
5589 /* If we are supposed to export all symbols into the dynamic symbol
5590 table (this is not the normal case), then do so. */
5591 if (info
->export_dynamic
5592 || (info
->executable
&& info
->dynamic
))
5594 elf_link_hash_traverse (elf_hash_table (info
),
5595 _bfd_elf_export_symbol
,
5601 /* Make all global versions with definition. */
5602 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5603 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5604 if (!d
->symver
&& d
->literal
)
5606 const char *verstr
, *name
;
5607 size_t namelen
, verlen
, newlen
;
5609 struct elf_link_hash_entry
*newh
;
5612 namelen
= strlen (name
);
5614 verlen
= strlen (verstr
);
5615 newlen
= namelen
+ verlen
+ 3;
5617 newname
= bfd_malloc (newlen
);
5618 if (newname
== NULL
)
5620 memcpy (newname
, name
, namelen
);
5622 /* Check the hidden versioned definition. */
5623 p
= newname
+ namelen
;
5625 memcpy (p
, verstr
, verlen
+ 1);
5626 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5627 newname
, FALSE
, FALSE
,
5630 || (newh
->root
.type
!= bfd_link_hash_defined
5631 && newh
->root
.type
!= bfd_link_hash_defweak
))
5633 /* Check the default versioned definition. */
5635 memcpy (p
, verstr
, verlen
+ 1);
5636 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5637 newname
, FALSE
, FALSE
,
5642 /* Mark this version if there is a definition and it is
5643 not defined in a shared object. */
5645 && !newh
->def_dynamic
5646 && (newh
->root
.type
== bfd_link_hash_defined
5647 || newh
->root
.type
== bfd_link_hash_defweak
))
5651 /* Attach all the symbols to their version information. */
5652 asvinfo
.info
= info
;
5653 asvinfo
.verdefs
= verdefs
;
5654 asvinfo
.failed
= FALSE
;
5656 elf_link_hash_traverse (elf_hash_table (info
),
5657 _bfd_elf_link_assign_sym_version
,
5662 if (!info
->allow_undefined_version
)
5664 /* Check if all global versions have a definition. */
5666 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5667 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5668 if (d
->literal
&& !d
->symver
&& !d
->script
)
5670 (*_bfd_error_handler
)
5671 (_("%s: undefined version: %s"),
5672 d
->pattern
, t
->name
);
5673 all_defined
= FALSE
;
5678 bfd_set_error (bfd_error_bad_value
);
5683 /* Find all symbols which were defined in a dynamic object and make
5684 the backend pick a reasonable value for them. */
5685 elf_link_hash_traverse (elf_hash_table (info
),
5686 _bfd_elf_adjust_dynamic_symbol
,
5691 /* Add some entries to the .dynamic section. We fill in some of the
5692 values later, in bfd_elf_final_link, but we must add the entries
5693 now so that we know the final size of the .dynamic section. */
5695 /* If there are initialization and/or finalization functions to
5696 call then add the corresponding DT_INIT/DT_FINI entries. */
5697 h
= (info
->init_function
5698 ? elf_link_hash_lookup (elf_hash_table (info
),
5699 info
->init_function
, FALSE
,
5706 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5709 h
= (info
->fini_function
5710 ? elf_link_hash_lookup (elf_hash_table (info
),
5711 info
->fini_function
, FALSE
,
5718 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5722 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
5723 if (s
!= NULL
&& s
->linker_has_input
)
5725 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5726 if (! info
->executable
)
5731 for (sub
= info
->input_bfds
; sub
!= NULL
;
5732 sub
= sub
->link_next
)
5733 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
5734 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5735 if (elf_section_data (o
)->this_hdr
.sh_type
5736 == SHT_PREINIT_ARRAY
)
5738 (*_bfd_error_handler
)
5739 (_("%B: .preinit_array section is not allowed in DSO"),
5744 bfd_set_error (bfd_error_nonrepresentable_section
);
5748 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5749 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5752 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
5753 if (s
!= NULL
&& s
->linker_has_input
)
5755 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5756 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5759 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
5760 if (s
!= NULL
&& s
->linker_has_input
)
5762 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5763 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5767 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
5768 /* If .dynstr is excluded from the link, we don't want any of
5769 these tags. Strictly, we should be checking each section
5770 individually; This quick check covers for the case where
5771 someone does a /DISCARD/ : { *(*) }. */
5772 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5774 bfd_size_type strsize
;
5776 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5777 if ((info
->emit_hash
5778 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
5779 || (info
->emit_gnu_hash
5780 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
5781 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5782 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5783 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5784 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5785 bed
->s
->sizeof_sym
))
5790 /* The backend must work out the sizes of all the other dynamic
5792 if (bed
->elf_backend_size_dynamic_sections
5793 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5796 if (elf_hash_table (info
)->dynamic_sections_created
)
5798 unsigned long section_sym_count
;
5801 /* Set up the version definition section. */
5802 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5803 BFD_ASSERT (s
!= NULL
);
5805 /* We may have created additional version definitions if we are
5806 just linking a regular application. */
5807 verdefs
= asvinfo
.verdefs
;
5809 /* Skip anonymous version tag. */
5810 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5811 verdefs
= verdefs
->next
;
5813 if (verdefs
== NULL
&& !info
->create_default_symver
)
5814 s
->flags
|= SEC_EXCLUDE
;
5819 struct bfd_elf_version_tree
*t
;
5821 Elf_Internal_Verdef def
;
5822 Elf_Internal_Verdaux defaux
;
5823 struct bfd_link_hash_entry
*bh
;
5824 struct elf_link_hash_entry
*h
;
5830 /* Make space for the base version. */
5831 size
+= sizeof (Elf_External_Verdef
);
5832 size
+= sizeof (Elf_External_Verdaux
);
5835 /* Make space for the default version. */
5836 if (info
->create_default_symver
)
5838 size
+= sizeof (Elf_External_Verdef
);
5842 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5844 struct bfd_elf_version_deps
*n
;
5846 size
+= sizeof (Elf_External_Verdef
);
5847 size
+= sizeof (Elf_External_Verdaux
);
5850 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5851 size
+= sizeof (Elf_External_Verdaux
);
5855 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5856 if (s
->contents
== NULL
&& s
->size
!= 0)
5859 /* Fill in the version definition section. */
5863 def
.vd_version
= VER_DEF_CURRENT
;
5864 def
.vd_flags
= VER_FLG_BASE
;
5867 if (info
->create_default_symver
)
5869 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
5870 def
.vd_next
= sizeof (Elf_External_Verdef
);
5874 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5875 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5876 + sizeof (Elf_External_Verdaux
));
5879 if (soname_indx
!= (bfd_size_type
) -1)
5881 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5883 def
.vd_hash
= bfd_elf_hash (soname
);
5884 defaux
.vda_name
= soname_indx
;
5891 name
= lbasename (output_bfd
->filename
);
5892 def
.vd_hash
= bfd_elf_hash (name
);
5893 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5895 if (indx
== (bfd_size_type
) -1)
5897 defaux
.vda_name
= indx
;
5899 defaux
.vda_next
= 0;
5901 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5902 (Elf_External_Verdef
*) p
);
5903 p
+= sizeof (Elf_External_Verdef
);
5904 if (info
->create_default_symver
)
5906 /* Add a symbol representing this version. */
5908 if (! (_bfd_generic_link_add_one_symbol
5909 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5911 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5913 h
= (struct elf_link_hash_entry
*) bh
;
5916 h
->type
= STT_OBJECT
;
5917 h
->verinfo
.vertree
= NULL
;
5919 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5922 /* Create a duplicate of the base version with the same
5923 aux block, but different flags. */
5926 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5928 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5929 + sizeof (Elf_External_Verdaux
));
5932 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5933 (Elf_External_Verdef
*) p
);
5934 p
+= sizeof (Elf_External_Verdef
);
5936 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5937 (Elf_External_Verdaux
*) p
);
5938 p
+= sizeof (Elf_External_Verdaux
);
5940 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5943 struct bfd_elf_version_deps
*n
;
5946 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5949 /* Add a symbol representing this version. */
5951 if (! (_bfd_generic_link_add_one_symbol
5952 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5954 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5956 h
= (struct elf_link_hash_entry
*) bh
;
5959 h
->type
= STT_OBJECT
;
5960 h
->verinfo
.vertree
= t
;
5962 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5965 def
.vd_version
= VER_DEF_CURRENT
;
5967 if (t
->globals
.list
== NULL
5968 && t
->locals
.list
== NULL
5970 def
.vd_flags
|= VER_FLG_WEAK
;
5971 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
5972 def
.vd_cnt
= cdeps
+ 1;
5973 def
.vd_hash
= bfd_elf_hash (t
->name
);
5974 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5976 if (t
->next
!= NULL
)
5977 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5978 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
5980 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5981 (Elf_External_Verdef
*) p
);
5982 p
+= sizeof (Elf_External_Verdef
);
5984 defaux
.vda_name
= h
->dynstr_index
;
5985 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5987 defaux
.vda_next
= 0;
5988 if (t
->deps
!= NULL
)
5989 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5990 t
->name_indx
= defaux
.vda_name
;
5992 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5993 (Elf_External_Verdaux
*) p
);
5994 p
+= sizeof (Elf_External_Verdaux
);
5996 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5998 if (n
->version_needed
== NULL
)
6000 /* This can happen if there was an error in the
6002 defaux
.vda_name
= 0;
6006 defaux
.vda_name
= n
->version_needed
->name_indx
;
6007 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6010 if (n
->next
== NULL
)
6011 defaux
.vda_next
= 0;
6013 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6015 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6016 (Elf_External_Verdaux
*) p
);
6017 p
+= sizeof (Elf_External_Verdaux
);
6021 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
6022 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
6025 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6028 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
6030 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
6033 else if (info
->flags
& DF_BIND_NOW
)
6035 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
6041 if (info
->executable
)
6042 info
->flags_1
&= ~ (DF_1_INITFIRST
6045 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
6049 /* Work out the size of the version reference section. */
6051 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
6052 BFD_ASSERT (s
!= NULL
);
6054 struct elf_find_verdep_info sinfo
;
6057 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6058 if (sinfo
.vers
== 0)
6060 sinfo
.failed
= FALSE
;
6062 elf_link_hash_traverse (elf_hash_table (info
),
6063 _bfd_elf_link_find_version_dependencies
,
6068 if (elf_tdata (output_bfd
)->verref
== NULL
)
6069 s
->flags
|= SEC_EXCLUDE
;
6072 Elf_Internal_Verneed
*t
;
6077 /* Build the version definition section. */
6080 for (t
= elf_tdata (output_bfd
)->verref
;
6084 Elf_Internal_Vernaux
*a
;
6086 size
+= sizeof (Elf_External_Verneed
);
6088 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6089 size
+= sizeof (Elf_External_Vernaux
);
6093 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
6094 if (s
->contents
== NULL
)
6098 for (t
= elf_tdata (output_bfd
)->verref
;
6103 Elf_Internal_Vernaux
*a
;
6107 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6110 t
->vn_version
= VER_NEED_CURRENT
;
6112 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6113 elf_dt_name (t
->vn_bfd
) != NULL
6114 ? elf_dt_name (t
->vn_bfd
)
6115 : lbasename (t
->vn_bfd
->filename
),
6117 if (indx
== (bfd_size_type
) -1)
6120 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6121 if (t
->vn_nextref
== NULL
)
6124 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6125 + caux
* sizeof (Elf_External_Vernaux
));
6127 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6128 (Elf_External_Verneed
*) p
);
6129 p
+= sizeof (Elf_External_Verneed
);
6131 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6133 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6134 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6135 a
->vna_nodename
, FALSE
);
6136 if (indx
== (bfd_size_type
) -1)
6139 if (a
->vna_nextptr
== NULL
)
6142 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6144 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6145 (Elf_External_Vernaux
*) p
);
6146 p
+= sizeof (Elf_External_Vernaux
);
6150 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6151 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6154 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6158 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6159 && elf_tdata (output_bfd
)->cverdefs
== 0)
6160 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6161 §ion_sym_count
) == 0)
6163 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6164 s
->flags
|= SEC_EXCLUDE
;
6170 /* Find the first non-excluded output section. We'll use its
6171 section symbol for some emitted relocs. */
6173 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6177 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6178 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6179 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6181 elf_hash_table (info
)->text_index_section
= s
;
6186 /* Find two non-excluded output sections, one for code, one for data.
6187 We'll use their section symbols for some emitted relocs. */
6189 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6193 /* Data first, since setting text_index_section changes
6194 _bfd_elf_link_omit_section_dynsym. */
6195 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6196 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6197 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6199 elf_hash_table (info
)->data_index_section
= s
;
6203 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6204 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6205 == (SEC_ALLOC
| SEC_READONLY
))
6206 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6208 elf_hash_table (info
)->text_index_section
= s
;
6212 if (elf_hash_table (info
)->text_index_section
== NULL
)
6213 elf_hash_table (info
)->text_index_section
6214 = elf_hash_table (info
)->data_index_section
;
6218 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6220 const struct elf_backend_data
*bed
;
6222 if (!is_elf_hash_table (info
->hash
))
6225 bed
= get_elf_backend_data (output_bfd
);
6226 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6228 if (elf_hash_table (info
)->dynamic_sections_created
)
6232 bfd_size_type dynsymcount
;
6233 unsigned long section_sym_count
;
6234 unsigned int dtagcount
;
6236 dynobj
= elf_hash_table (info
)->dynobj
;
6238 /* Assign dynsym indicies. In a shared library we generate a
6239 section symbol for each output section, which come first.
6240 Next come all of the back-end allocated local dynamic syms,
6241 followed by the rest of the global symbols. */
6243 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6244 §ion_sym_count
);
6246 /* Work out the size of the symbol version section. */
6247 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6248 BFD_ASSERT (s
!= NULL
);
6249 if (dynsymcount
!= 0
6250 && (s
->flags
& SEC_EXCLUDE
) == 0)
6252 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6253 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
6254 if (s
->contents
== NULL
)
6257 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6261 /* Set the size of the .dynsym and .hash sections. We counted
6262 the number of dynamic symbols in elf_link_add_object_symbols.
6263 We will build the contents of .dynsym and .hash when we build
6264 the final symbol table, because until then we do not know the
6265 correct value to give the symbols. We built the .dynstr
6266 section as we went along in elf_link_add_object_symbols. */
6267 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
6268 BFD_ASSERT (s
!= NULL
);
6269 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6271 if (dynsymcount
!= 0)
6273 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
6274 if (s
->contents
== NULL
)
6277 /* The first entry in .dynsym is a dummy symbol.
6278 Clear all the section syms, in case we don't output them all. */
6279 ++section_sym_count
;
6280 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6283 elf_hash_table (info
)->bucketcount
= 0;
6285 /* Compute the size of the hashing table. As a side effect this
6286 computes the hash values for all the names we export. */
6287 if (info
->emit_hash
)
6289 unsigned long int *hashcodes
;
6290 struct hash_codes_info hashinf
;
6292 unsigned long int nsyms
;
6294 size_t hash_entry_size
;
6296 /* Compute the hash values for all exported symbols. At the same
6297 time store the values in an array so that we could use them for
6299 amt
= dynsymcount
* sizeof (unsigned long int);
6300 hashcodes
= bfd_malloc (amt
);
6301 if (hashcodes
== NULL
)
6303 hashinf
.hashcodes
= hashcodes
;
6304 hashinf
.error
= FALSE
;
6306 /* Put all hash values in HASHCODES. */
6307 elf_link_hash_traverse (elf_hash_table (info
),
6308 elf_collect_hash_codes
, &hashinf
);
6315 nsyms
= hashinf
.hashcodes
- hashcodes
;
6317 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6320 if (bucketcount
== 0)
6323 elf_hash_table (info
)->bucketcount
= bucketcount
;
6325 s
= bfd_get_section_by_name (dynobj
, ".hash");
6326 BFD_ASSERT (s
!= NULL
);
6327 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6328 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6329 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
6330 if (s
->contents
== NULL
)
6333 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6334 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6335 s
->contents
+ hash_entry_size
);
6338 if (info
->emit_gnu_hash
)
6341 unsigned char *contents
;
6342 struct collect_gnu_hash_codes cinfo
;
6346 memset (&cinfo
, 0, sizeof (cinfo
));
6348 /* Compute the hash values for all exported symbols. At the same
6349 time store the values in an array so that we could use them for
6351 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6352 cinfo
.hashcodes
= bfd_malloc (amt
);
6353 if (cinfo
.hashcodes
== NULL
)
6356 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6357 cinfo
.min_dynindx
= -1;
6358 cinfo
.output_bfd
= output_bfd
;
6361 /* Put all hash values in HASHCODES. */
6362 elf_link_hash_traverse (elf_hash_table (info
),
6363 elf_collect_gnu_hash_codes
, &cinfo
);
6366 free (cinfo
.hashcodes
);
6371 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6373 if (bucketcount
== 0)
6375 free (cinfo
.hashcodes
);
6379 s
= bfd_get_section_by_name (dynobj
, ".gnu.hash");
6380 BFD_ASSERT (s
!= NULL
);
6382 if (cinfo
.nsyms
== 0)
6384 /* Empty .gnu.hash section is special. */
6385 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6386 free (cinfo
.hashcodes
);
6387 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6388 contents
= bfd_zalloc (output_bfd
, s
->size
);
6389 if (contents
== NULL
)
6391 s
->contents
= contents
;
6392 /* 1 empty bucket. */
6393 bfd_put_32 (output_bfd
, 1, contents
);
6394 /* SYMIDX above the special symbol 0. */
6395 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6396 /* Just one word for bitmask. */
6397 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6398 /* Only hash fn bloom filter. */
6399 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6400 /* No hashes are valid - empty bitmask. */
6401 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6402 /* No hashes in the only bucket. */
6403 bfd_put_32 (output_bfd
, 0,
6404 contents
+ 16 + bed
->s
->arch_size
/ 8);
6408 unsigned long int maskwords
, maskbitslog2
;
6409 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6411 maskbitslog2
= bfd_log2 (cinfo
.nsyms
) + 1;
6412 if (maskbitslog2
< 3)
6414 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6415 maskbitslog2
= maskbitslog2
+ 3;
6417 maskbitslog2
= maskbitslog2
+ 2;
6418 if (bed
->s
->arch_size
== 64)
6420 if (maskbitslog2
== 5)
6426 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6427 cinfo
.shift2
= maskbitslog2
;
6428 cinfo
.maskbits
= 1 << maskbitslog2
;
6429 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6430 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6431 amt
+= maskwords
* sizeof (bfd_vma
);
6432 cinfo
.bitmask
= bfd_malloc (amt
);
6433 if (cinfo
.bitmask
== NULL
)
6435 free (cinfo
.hashcodes
);
6439 cinfo
.counts
= (void *) (cinfo
.bitmask
+ maskwords
);
6440 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6441 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6442 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6444 /* Determine how often each hash bucket is used. */
6445 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6446 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6447 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6449 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6450 if (cinfo
.counts
[i
] != 0)
6452 cinfo
.indx
[i
] = cnt
;
6453 cnt
+= cinfo
.counts
[i
];
6455 BFD_ASSERT (cnt
== dynsymcount
);
6456 cinfo
.bucketcount
= bucketcount
;
6457 cinfo
.local_indx
= cinfo
.min_dynindx
;
6459 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6460 s
->size
+= cinfo
.maskbits
/ 8;
6461 contents
= bfd_zalloc (output_bfd
, s
->size
);
6462 if (contents
== NULL
)
6464 free (cinfo
.bitmask
);
6465 free (cinfo
.hashcodes
);
6469 s
->contents
= contents
;
6470 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6471 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6472 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6473 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6474 contents
+= 16 + cinfo
.maskbits
/ 8;
6476 for (i
= 0; i
< bucketcount
; ++i
)
6478 if (cinfo
.counts
[i
] == 0)
6479 bfd_put_32 (output_bfd
, 0, contents
);
6481 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6485 cinfo
.contents
= contents
;
6487 /* Renumber dynamic symbols, populate .gnu.hash section. */
6488 elf_link_hash_traverse (elf_hash_table (info
),
6489 elf_renumber_gnu_hash_syms
, &cinfo
);
6491 contents
= s
->contents
+ 16;
6492 for (i
= 0; i
< maskwords
; ++i
)
6494 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6496 contents
+= bed
->s
->arch_size
/ 8;
6499 free (cinfo
.bitmask
);
6500 free (cinfo
.hashcodes
);
6504 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
6505 BFD_ASSERT (s
!= NULL
);
6507 elf_finalize_dynstr (output_bfd
, info
);
6509 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6511 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6512 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
6519 /* Indicate that we are only retrieving symbol values from this
6523 _bfd_elf_link_just_syms (asection
*sec
, struct bfd_link_info
*info
)
6525 if (is_elf_hash_table (info
->hash
))
6526 sec
->sec_info_type
= ELF_INFO_TYPE_JUST_SYMS
;
6527 _bfd_generic_link_just_syms (sec
, info
);
6530 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6533 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
6536 BFD_ASSERT (sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
);
6537 sec
->sec_info_type
= ELF_INFO_TYPE_NONE
;
6540 /* Finish SHF_MERGE section merging. */
6543 _bfd_elf_merge_sections (bfd
*abfd
, struct bfd_link_info
*info
)
6548 if (!is_elf_hash_table (info
->hash
))
6551 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
6552 if ((ibfd
->flags
& DYNAMIC
) == 0)
6553 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6554 if ((sec
->flags
& SEC_MERGE
) != 0
6555 && !bfd_is_abs_section (sec
->output_section
))
6557 struct bfd_elf_section_data
*secdata
;
6559 secdata
= elf_section_data (sec
);
6560 if (! _bfd_add_merge_section (abfd
,
6561 &elf_hash_table (info
)->merge_info
,
6562 sec
, &secdata
->sec_info
))
6564 else if (secdata
->sec_info
)
6565 sec
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
6568 if (elf_hash_table (info
)->merge_info
!= NULL
)
6569 _bfd_merge_sections (abfd
, info
, elf_hash_table (info
)->merge_info
,
6570 merge_sections_remove_hook
);
6574 /* Create an entry in an ELF linker hash table. */
6576 struct bfd_hash_entry
*
6577 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
6578 struct bfd_hash_table
*table
,
6581 /* Allocate the structure if it has not already been allocated by a
6585 entry
= bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
6590 /* Call the allocation method of the superclass. */
6591 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
6594 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
6595 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
6597 /* Set local fields. */
6600 ret
->got
= htab
->init_got_refcount
;
6601 ret
->plt
= htab
->init_plt_refcount
;
6602 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
6603 - offsetof (struct elf_link_hash_entry
, size
)));
6604 /* Assume that we have been called by a non-ELF symbol reader.
6605 This flag is then reset by the code which reads an ELF input
6606 file. This ensures that a symbol created by a non-ELF symbol
6607 reader will have the flag set correctly. */
6614 /* Copy data from an indirect symbol to its direct symbol, hiding the
6615 old indirect symbol. Also used for copying flags to a weakdef. */
6618 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
6619 struct elf_link_hash_entry
*dir
,
6620 struct elf_link_hash_entry
*ind
)
6622 struct elf_link_hash_table
*htab
;
6624 /* Copy down any references that we may have already seen to the
6625 symbol which just became indirect. */
6627 dir
->ref_dynamic
|= ind
->ref_dynamic
;
6628 dir
->ref_regular
|= ind
->ref_regular
;
6629 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
6630 dir
->non_got_ref
|= ind
->non_got_ref
;
6631 dir
->needs_plt
|= ind
->needs_plt
;
6632 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
6634 if (ind
->root
.type
!= bfd_link_hash_indirect
)
6637 /* Copy over the global and procedure linkage table refcount entries.
6638 These may have been already set up by a check_relocs routine. */
6639 htab
= elf_hash_table (info
);
6640 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
6642 if (dir
->got
.refcount
< 0)
6643 dir
->got
.refcount
= 0;
6644 dir
->got
.refcount
+= ind
->got
.refcount
;
6645 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
6648 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
6650 if (dir
->plt
.refcount
< 0)
6651 dir
->plt
.refcount
= 0;
6652 dir
->plt
.refcount
+= ind
->plt
.refcount
;
6653 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
6656 if (ind
->dynindx
!= -1)
6658 if (dir
->dynindx
!= -1)
6659 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
6660 dir
->dynindx
= ind
->dynindx
;
6661 dir
->dynstr_index
= ind
->dynstr_index
;
6663 ind
->dynstr_index
= 0;
6668 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
6669 struct elf_link_hash_entry
*h
,
6670 bfd_boolean force_local
)
6672 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
6676 h
->forced_local
= 1;
6677 if (h
->dynindx
!= -1)
6680 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
6686 /* Initialize an ELF linker hash table. */
6689 _bfd_elf_link_hash_table_init
6690 (struct elf_link_hash_table
*table
,
6692 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
6693 struct bfd_hash_table
*,
6695 unsigned int entsize
)
6698 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
6700 memset (table
, 0, sizeof * table
);
6701 table
->init_got_refcount
.refcount
= can_refcount
- 1;
6702 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
6703 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
6704 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
6705 /* The first dynamic symbol is a dummy. */
6706 table
->dynsymcount
= 1;
6708 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
6709 table
->root
.type
= bfd_link_elf_hash_table
;
6714 /* Create an ELF linker hash table. */
6716 struct bfd_link_hash_table
*
6717 _bfd_elf_link_hash_table_create (bfd
*abfd
)
6719 struct elf_link_hash_table
*ret
;
6720 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
6722 ret
= bfd_malloc (amt
);
6726 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
6727 sizeof (struct elf_link_hash_entry
)))
6736 /* This is a hook for the ELF emulation code in the generic linker to
6737 tell the backend linker what file name to use for the DT_NEEDED
6738 entry for a dynamic object. */
6741 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
6743 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6744 && bfd_get_format (abfd
) == bfd_object
)
6745 elf_dt_name (abfd
) = name
;
6749 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
6752 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6753 && bfd_get_format (abfd
) == bfd_object
)
6754 lib_class
= elf_dyn_lib_class (abfd
);
6761 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
6763 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6764 && bfd_get_format (abfd
) == bfd_object
)
6765 elf_dyn_lib_class (abfd
) = lib_class
;
6768 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6769 the linker ELF emulation code. */
6771 struct bfd_link_needed_list
*
6772 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6773 struct bfd_link_info
*info
)
6775 if (! is_elf_hash_table (info
->hash
))
6777 return elf_hash_table (info
)->needed
;
6780 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6781 hook for the linker ELF emulation code. */
6783 struct bfd_link_needed_list
*
6784 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6785 struct bfd_link_info
*info
)
6787 if (! is_elf_hash_table (info
->hash
))
6789 return elf_hash_table (info
)->runpath
;
6792 /* Get the name actually used for a dynamic object for a link. This
6793 is the SONAME entry if there is one. Otherwise, it is the string
6794 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6797 bfd_elf_get_dt_soname (bfd
*abfd
)
6799 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6800 && bfd_get_format (abfd
) == bfd_object
)
6801 return elf_dt_name (abfd
);
6805 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6806 the ELF linker emulation code. */
6809 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
6810 struct bfd_link_needed_list
**pneeded
)
6813 bfd_byte
*dynbuf
= NULL
;
6814 unsigned int elfsec
;
6815 unsigned long shlink
;
6816 bfd_byte
*extdyn
, *extdynend
;
6818 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
6822 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
6823 || bfd_get_format (abfd
) != bfd_object
)
6826 s
= bfd_get_section_by_name (abfd
, ".dynamic");
6827 if (s
== NULL
|| s
->size
== 0)
6830 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
6833 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
6834 if (elfsec
== SHN_BAD
)
6837 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
6839 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
6840 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
6843 extdynend
= extdyn
+ s
->size
;
6844 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
6846 Elf_Internal_Dyn dyn
;
6848 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
6850 if (dyn
.d_tag
== DT_NULL
)
6853 if (dyn
.d_tag
== DT_NEEDED
)
6856 struct bfd_link_needed_list
*l
;
6857 unsigned int tagv
= dyn
.d_un
.d_val
;
6860 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
6865 l
= bfd_alloc (abfd
, amt
);
6886 struct elf_symbuf_symbol
6888 unsigned long st_name
; /* Symbol name, index in string tbl */
6889 unsigned char st_info
; /* Type and binding attributes */
6890 unsigned char st_other
; /* Visibilty, and target specific */
6893 struct elf_symbuf_head
6895 struct elf_symbuf_symbol
*ssym
;
6896 bfd_size_type count
;
6897 unsigned int st_shndx
;
6904 Elf_Internal_Sym
*isym
;
6905 struct elf_symbuf_symbol
*ssym
;
6910 /* Sort references to symbols by ascending section number. */
6913 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
6915 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
6916 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
6918 return s1
->st_shndx
- s2
->st_shndx
;
6922 elf_sym_name_compare (const void *arg1
, const void *arg2
)
6924 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
6925 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
6926 return strcmp (s1
->name
, s2
->name
);
6929 static struct elf_symbuf_head
*
6930 elf_create_symbuf (bfd_size_type symcount
, Elf_Internal_Sym
*isymbuf
)
6932 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
6933 struct elf_symbuf_symbol
*ssym
;
6934 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
6935 bfd_size_type i
, shndx_count
, total_size
;
6937 indbuf
= bfd_malloc2 (symcount
, sizeof (*indbuf
));
6941 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
6942 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
6943 *ind
++ = &isymbuf
[i
];
6946 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
6947 elf_sort_elf_symbol
);
6950 if (indbufend
> indbuf
)
6951 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
6952 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
6955 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
6956 + (indbufend
- indbuf
) * sizeof (*ssym
));
6957 ssymbuf
= bfd_malloc (total_size
);
6958 if (ssymbuf
== NULL
)
6964 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
6965 ssymbuf
->ssym
= NULL
;
6966 ssymbuf
->count
= shndx_count
;
6967 ssymbuf
->st_shndx
= 0;
6968 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
6970 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
6973 ssymhead
->ssym
= ssym
;
6974 ssymhead
->count
= 0;
6975 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
6977 ssym
->st_name
= (*ind
)->st_name
;
6978 ssym
->st_info
= (*ind
)->st_info
;
6979 ssym
->st_other
= (*ind
)->st_other
;
6982 BFD_ASSERT ((bfd_size_type
) (ssymhead
- ssymbuf
) == shndx_count
6983 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
6990 /* Check if 2 sections define the same set of local and global
6994 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
6995 struct bfd_link_info
*info
)
6998 const struct elf_backend_data
*bed1
, *bed2
;
6999 Elf_Internal_Shdr
*hdr1
, *hdr2
;
7000 bfd_size_type symcount1
, symcount2
;
7001 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
7002 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
7003 Elf_Internal_Sym
*isym
, *isymend
;
7004 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
7005 bfd_size_type count1
, count2
, i
;
7006 unsigned int shndx1
, shndx2
;
7012 /* Both sections have to be in ELF. */
7013 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
7014 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
7017 if (elf_section_type (sec1
) != elf_section_type (sec2
))
7020 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
7021 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
7022 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
7025 bed1
= get_elf_backend_data (bfd1
);
7026 bed2
= get_elf_backend_data (bfd2
);
7027 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
7028 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
7029 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
7030 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
7032 if (symcount1
== 0 || symcount2
== 0)
7038 ssymbuf1
= elf_tdata (bfd1
)->symbuf
;
7039 ssymbuf2
= elf_tdata (bfd2
)->symbuf
;
7041 if (ssymbuf1
== NULL
)
7043 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
7045 if (isymbuf1
== NULL
)
7048 if (!info
->reduce_memory_overheads
)
7049 elf_tdata (bfd1
)->symbuf
= ssymbuf1
7050 = elf_create_symbuf (symcount1
, isymbuf1
);
7053 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
7055 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
7057 if (isymbuf2
== NULL
)
7060 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
7061 elf_tdata (bfd2
)->symbuf
= ssymbuf2
7062 = elf_create_symbuf (symcount2
, isymbuf2
);
7065 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7067 /* Optimized faster version. */
7068 bfd_size_type lo
, hi
, mid
;
7069 struct elf_symbol
*symp
;
7070 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7073 hi
= ssymbuf1
->count
;
7078 mid
= (lo
+ hi
) / 2;
7079 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7081 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7085 count1
= ssymbuf1
[mid
].count
;
7092 hi
= ssymbuf2
->count
;
7097 mid
= (lo
+ hi
) / 2;
7098 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7100 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7104 count2
= ssymbuf2
[mid
].count
;
7110 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7113 symtable1
= bfd_malloc (count1
* sizeof (struct elf_symbol
));
7114 symtable2
= bfd_malloc (count2
* sizeof (struct elf_symbol
));
7115 if (symtable1
== NULL
|| symtable2
== NULL
)
7119 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7120 ssym
< ssymend
; ssym
++, symp
++)
7122 symp
->u
.ssym
= ssym
;
7123 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7129 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7130 ssym
< ssymend
; ssym
++, symp
++)
7132 symp
->u
.ssym
= ssym
;
7133 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7138 /* Sort symbol by name. */
7139 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7140 elf_sym_name_compare
);
7141 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7142 elf_sym_name_compare
);
7144 for (i
= 0; i
< count1
; i
++)
7145 /* Two symbols must have the same binding, type and name. */
7146 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7147 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7148 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7155 symtable1
= bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7156 symtable2
= bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7157 if (symtable1
== NULL
|| symtable2
== NULL
)
7160 /* Count definitions in the section. */
7162 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7163 if (isym
->st_shndx
== shndx1
)
7164 symtable1
[count1
++].u
.isym
= isym
;
7167 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7168 if (isym
->st_shndx
== shndx2
)
7169 symtable2
[count2
++].u
.isym
= isym
;
7171 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7174 for (i
= 0; i
< count1
; i
++)
7176 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7177 symtable1
[i
].u
.isym
->st_name
);
7179 for (i
= 0; i
< count2
; i
++)
7181 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7182 symtable2
[i
].u
.isym
->st_name
);
7184 /* Sort symbol by name. */
7185 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7186 elf_sym_name_compare
);
7187 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7188 elf_sym_name_compare
);
7190 for (i
= 0; i
< count1
; i
++)
7191 /* Two symbols must have the same binding, type and name. */
7192 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7193 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7194 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7212 /* Return TRUE if 2 section types are compatible. */
7215 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7216 bfd
*bbfd
, const asection
*bsec
)
7220 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7221 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7224 return elf_section_type (asec
) == elf_section_type (bsec
);
7227 /* Final phase of ELF linker. */
7229 /* A structure we use to avoid passing large numbers of arguments. */
7231 struct elf_final_link_info
7233 /* General link information. */
7234 struct bfd_link_info
*info
;
7237 /* Symbol string table. */
7238 struct bfd_strtab_hash
*symstrtab
;
7239 /* .dynsym section. */
7240 asection
*dynsym_sec
;
7241 /* .hash section. */
7243 /* symbol version section (.gnu.version). */
7244 asection
*symver_sec
;
7245 /* Buffer large enough to hold contents of any section. */
7247 /* Buffer large enough to hold external relocs of any section. */
7248 void *external_relocs
;
7249 /* Buffer large enough to hold internal relocs of any section. */
7250 Elf_Internal_Rela
*internal_relocs
;
7251 /* Buffer large enough to hold external local symbols of any input
7253 bfd_byte
*external_syms
;
7254 /* And a buffer for symbol section indices. */
7255 Elf_External_Sym_Shndx
*locsym_shndx
;
7256 /* Buffer large enough to hold internal local symbols of any input
7258 Elf_Internal_Sym
*internal_syms
;
7259 /* Array large enough to hold a symbol index for each local symbol
7260 of any input BFD. */
7262 /* Array large enough to hold a section pointer for each local
7263 symbol of any input BFD. */
7264 asection
**sections
;
7265 /* Buffer to hold swapped out symbols. */
7267 /* And one for symbol section indices. */
7268 Elf_External_Sym_Shndx
*symshndxbuf
;
7269 /* Number of swapped out symbols in buffer. */
7270 size_t symbuf_count
;
7271 /* Number of symbols which fit in symbuf. */
7273 /* And same for symshndxbuf. */
7274 size_t shndxbuf_size
;
7277 /* This struct is used to pass information to elf_link_output_extsym. */
7279 struct elf_outext_info
7282 bfd_boolean localsyms
;
7283 struct elf_final_link_info
*finfo
;
7287 /* Support for evaluating a complex relocation.
7289 Complex relocations are generalized, self-describing relocations. The
7290 implementation of them consists of two parts: complex symbols, and the
7291 relocations themselves.
7293 The relocations are use a reserved elf-wide relocation type code (R_RELC
7294 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7295 information (start bit, end bit, word width, etc) into the addend. This
7296 information is extracted from CGEN-generated operand tables within gas.
7298 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7299 internal) representing prefix-notation expressions, including but not
7300 limited to those sorts of expressions normally encoded as addends in the
7301 addend field. The symbol mangling format is:
7304 | <unary-operator> ':' <node>
7305 | <binary-operator> ':' <node> ':' <node>
7308 <literal> := 's' <digits=N> ':' <N character symbol name>
7309 | 'S' <digits=N> ':' <N character section name>
7313 <binary-operator> := as in C
7314 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7317 set_symbol_value (bfd
*bfd_with_globals
,
7318 Elf_Internal_Sym
*isymbuf
,
7323 struct elf_link_hash_entry
**sym_hashes
;
7324 struct elf_link_hash_entry
*h
;
7325 size_t extsymoff
= locsymcount
;
7327 if (symidx
< locsymcount
)
7329 Elf_Internal_Sym
*sym
;
7331 sym
= isymbuf
+ symidx
;
7332 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7334 /* It is a local symbol: move it to the
7335 "absolute" section and give it a value. */
7336 sym
->st_shndx
= SHN_ABS
;
7337 sym
->st_value
= val
;
7340 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7344 /* It is a global symbol: set its link type
7345 to "defined" and give it a value. */
7347 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7348 h
= sym_hashes
[symidx
- extsymoff
];
7349 while (h
->root
.type
== bfd_link_hash_indirect
7350 || h
->root
.type
== bfd_link_hash_warning
)
7351 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7352 h
->root
.type
= bfd_link_hash_defined
;
7353 h
->root
.u
.def
.value
= val
;
7354 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7358 resolve_symbol (const char *name
,
7360 struct elf_final_link_info
*finfo
,
7362 Elf_Internal_Sym
*isymbuf
,
7365 Elf_Internal_Sym
*sym
;
7366 struct bfd_link_hash_entry
*global_entry
;
7367 const char *candidate
= NULL
;
7368 Elf_Internal_Shdr
*symtab_hdr
;
7371 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7373 for (i
= 0; i
< locsymcount
; ++ i
)
7377 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7380 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7381 symtab_hdr
->sh_link
,
7384 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7385 name
, candidate
, (unsigned long) sym
->st_value
);
7387 if (candidate
&& strcmp (candidate
, name
) == 0)
7389 asection
*sec
= finfo
->sections
[i
];
7391 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7392 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7394 printf ("Found symbol with value %8.8lx\n",
7395 (unsigned long) *result
);
7401 /* Hmm, haven't found it yet. perhaps it is a global. */
7402 global_entry
= bfd_link_hash_lookup (finfo
->info
->hash
, name
,
7403 FALSE
, FALSE
, TRUE
);
7407 if (global_entry
->type
== bfd_link_hash_defined
7408 || global_entry
->type
== bfd_link_hash_defweak
)
7410 *result
= (global_entry
->u
.def
.value
7411 + global_entry
->u
.def
.section
->output_section
->vma
7412 + global_entry
->u
.def
.section
->output_offset
);
7414 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7415 global_entry
->root
.string
, (unsigned long) *result
);
7424 resolve_section (const char *name
,
7431 for (curr
= sections
; curr
; curr
= curr
->next
)
7432 if (strcmp (curr
->name
, name
) == 0)
7434 *result
= curr
->vma
;
7438 /* Hmm. still haven't found it. try pseudo-section names. */
7439 for (curr
= sections
; curr
; curr
= curr
->next
)
7441 len
= strlen (curr
->name
);
7442 if (len
> strlen (name
))
7445 if (strncmp (curr
->name
, name
, len
) == 0)
7447 if (strncmp (".end", name
+ len
, 4) == 0)
7449 *result
= curr
->vma
+ curr
->size
;
7453 /* Insert more pseudo-section names here, if you like. */
7461 undefined_reference (const char *reftype
, const char *name
)
7463 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7468 eval_symbol (bfd_vma
*result
,
7471 struct elf_final_link_info
*finfo
,
7473 Elf_Internal_Sym
*isymbuf
,
7482 const char *sym
= *symp
;
7484 bfd_boolean symbol_is_section
= FALSE
;
7489 if (len
< 1 || len
> sizeof (symbuf
))
7491 bfd_set_error (bfd_error_invalid_operation
);
7504 *result
= strtoul (sym
, (char **) symp
, 16);
7508 symbol_is_section
= TRUE
;
7511 symlen
= strtol (sym
, (char **) symp
, 10);
7512 sym
= *symp
+ 1; /* Skip the trailing ':'. */
7514 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
7516 bfd_set_error (bfd_error_invalid_operation
);
7520 memcpy (symbuf
, sym
, symlen
);
7521 symbuf
[symlen
] = '\0';
7522 *symp
= sym
+ symlen
;
7524 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7525 the symbol as a section, or vice-versa. so we're pretty liberal in our
7526 interpretation here; section means "try section first", not "must be a
7527 section", and likewise with symbol. */
7529 if (symbol_is_section
)
7531 if (!resolve_section (symbuf
, finfo
->output_bfd
->sections
, result
)
7532 && !resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7533 isymbuf
, locsymcount
))
7535 undefined_reference ("section", symbuf
);
7541 if (!resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7542 isymbuf
, locsymcount
)
7543 && !resolve_section (symbuf
, finfo
->output_bfd
->sections
,
7546 undefined_reference ("symbol", symbuf
);
7553 /* All that remains are operators. */
7555 #define UNARY_OP(op) \
7556 if (strncmp (sym, #op, strlen (#op)) == 0) \
7558 sym += strlen (#op); \
7562 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7563 isymbuf, locsymcount, signed_p)) \
7566 *result = op ((bfd_signed_vma) a); \
7572 #define BINARY_OP(op) \
7573 if (strncmp (sym, #op, strlen (#op)) == 0) \
7575 sym += strlen (#op); \
7579 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7580 isymbuf, locsymcount, signed_p)) \
7583 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7584 isymbuf, locsymcount, signed_p)) \
7587 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7617 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
7618 bfd_set_error (bfd_error_invalid_operation
);
7624 put_value (bfd_vma size
,
7625 unsigned long chunksz
,
7630 location
+= (size
- chunksz
);
7632 for (; size
; size
-= chunksz
, location
-= chunksz
, x
>>= (chunksz
* 8))
7640 bfd_put_8 (input_bfd
, x
, location
);
7643 bfd_put_16 (input_bfd
, x
, location
);
7646 bfd_put_32 (input_bfd
, x
, location
);
7650 bfd_put_64 (input_bfd
, x
, location
);
7660 get_value (bfd_vma size
,
7661 unsigned long chunksz
,
7667 for (; size
; size
-= chunksz
, location
+= chunksz
)
7675 x
= (x
<< (8 * chunksz
)) | bfd_get_8 (input_bfd
, location
);
7678 x
= (x
<< (8 * chunksz
)) | bfd_get_16 (input_bfd
, location
);
7681 x
= (x
<< (8 * chunksz
)) | bfd_get_32 (input_bfd
, location
);
7685 x
= (x
<< (8 * chunksz
)) | bfd_get_64 (input_bfd
, location
);
7696 decode_complex_addend (unsigned long *start
, /* in bits */
7697 unsigned long *oplen
, /* in bits */
7698 unsigned long *len
, /* in bits */
7699 unsigned long *wordsz
, /* in bytes */
7700 unsigned long *chunksz
, /* in bytes */
7701 unsigned long *lsb0_p
,
7702 unsigned long *signed_p
,
7703 unsigned long *trunc_p
,
7704 unsigned long encoded
)
7706 * start
= encoded
& 0x3F;
7707 * len
= (encoded
>> 6) & 0x3F;
7708 * oplen
= (encoded
>> 12) & 0x3F;
7709 * wordsz
= (encoded
>> 18) & 0xF;
7710 * chunksz
= (encoded
>> 22) & 0xF;
7711 * lsb0_p
= (encoded
>> 27) & 1;
7712 * signed_p
= (encoded
>> 28) & 1;
7713 * trunc_p
= (encoded
>> 29) & 1;
7716 bfd_reloc_status_type
7717 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
7718 asection
*input_section ATTRIBUTE_UNUSED
,
7720 Elf_Internal_Rela
*rel
,
7723 bfd_vma shift
, x
, mask
;
7724 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
7725 bfd_reloc_status_type r
;
7727 /* Perform this reloc, since it is complex.
7728 (this is not to say that it necessarily refers to a complex
7729 symbol; merely that it is a self-describing CGEN based reloc.
7730 i.e. the addend has the complete reloc information (bit start, end,
7731 word size, etc) encoded within it.). */
7733 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
7734 &chunksz
, &lsb0_p
, &signed_p
,
7735 &trunc_p
, rel
->r_addend
);
7737 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
7740 shift
= (start
+ 1) - len
;
7742 shift
= (8 * wordsz
) - (start
+ len
);
7744 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ rel
->r_offset
);
7747 printf ("Doing complex reloc: "
7748 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7749 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7750 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7751 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
7752 oplen
, x
, mask
, relocation
);
7757 /* Now do an overflow check. */
7758 r
= bfd_check_overflow ((signed_p
7759 ? complain_overflow_signed
7760 : complain_overflow_unsigned
),
7761 len
, 0, (8 * wordsz
),
7765 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
7768 printf (" relocation: %8.8lx\n"
7769 " shifted mask: %8.8lx\n"
7770 " shifted/masked reloc: %8.8lx\n"
7771 " result: %8.8lx\n",
7772 relocation
, (mask
<< shift
),
7773 ((relocation
& mask
) << shift
), x
);
7775 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ rel
->r_offset
);
7779 /* When performing a relocatable link, the input relocations are
7780 preserved. But, if they reference global symbols, the indices
7781 referenced must be updated. Update all the relocations in
7782 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
7785 elf_link_adjust_relocs (bfd
*abfd
,
7786 Elf_Internal_Shdr
*rel_hdr
,
7788 struct elf_link_hash_entry
**rel_hash
)
7791 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7793 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7794 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7795 bfd_vma r_type_mask
;
7798 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
7800 swap_in
= bed
->s
->swap_reloc_in
;
7801 swap_out
= bed
->s
->swap_reloc_out
;
7803 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
7805 swap_in
= bed
->s
->swap_reloca_in
;
7806 swap_out
= bed
->s
->swap_reloca_out
;
7811 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
7814 if (bed
->s
->arch_size
== 32)
7821 r_type_mask
= 0xffffffff;
7825 erela
= rel_hdr
->contents
;
7826 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
7828 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
7831 if (*rel_hash
== NULL
)
7834 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
7836 (*swap_in
) (abfd
, erela
, irela
);
7837 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
7838 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
7839 | (irela
[j
].r_info
& r_type_mask
));
7840 (*swap_out
) (abfd
, irela
, erela
);
7844 struct elf_link_sort_rela
7850 enum elf_reloc_type_class type
;
7851 /* We use this as an array of size int_rels_per_ext_rel. */
7852 Elf_Internal_Rela rela
[1];
7856 elf_link_sort_cmp1 (const void *A
, const void *B
)
7858 const struct elf_link_sort_rela
*a
= A
;
7859 const struct elf_link_sort_rela
*b
= B
;
7860 int relativea
, relativeb
;
7862 relativea
= a
->type
== reloc_class_relative
;
7863 relativeb
= b
->type
== reloc_class_relative
;
7865 if (relativea
< relativeb
)
7867 if (relativea
> relativeb
)
7869 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
7871 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
7873 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
7875 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
7881 elf_link_sort_cmp2 (const void *A
, const void *B
)
7883 const struct elf_link_sort_rela
*a
= A
;
7884 const struct elf_link_sort_rela
*b
= B
;
7887 if (a
->u
.offset
< b
->u
.offset
)
7889 if (a
->u
.offset
> b
->u
.offset
)
7891 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
7892 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
7897 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
7899 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
7905 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
7907 asection
*dynamic_relocs
;
7910 bfd_size_type count
, size
;
7911 size_t i
, ret
, sort_elt
, ext_size
;
7912 bfd_byte
*sort
, *s_non_relative
, *p
;
7913 struct elf_link_sort_rela
*sq
;
7914 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7915 int i2e
= bed
->s
->int_rels_per_ext_rel
;
7916 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7917 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7918 struct bfd_link_order
*lo
;
7920 bfd_boolean use_rela
;
7922 /* Find a dynamic reloc section. */
7923 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
7924 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
7925 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
7926 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
7928 bfd_boolean use_rela_initialised
= FALSE
;
7930 /* This is just here to stop gcc from complaining.
7931 It's initialization checking code is not perfect. */
7934 /* Both sections are present. Examine the sizes
7935 of the indirect sections to help us choose. */
7936 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
7937 if (lo
->type
== bfd_indirect_link_order
)
7939 asection
*o
= lo
->u
.indirect
.section
;
7941 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
7943 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
7944 /* Section size is divisible by both rel and rela sizes.
7945 It is of no help to us. */
7949 /* Section size is only divisible by rela. */
7950 if (use_rela_initialised
&& (use_rela
== FALSE
))
7953 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
7954 bfd_set_error (bfd_error_invalid_operation
);
7960 use_rela_initialised
= TRUE
;
7964 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
7966 /* Section size is only divisible by rel. */
7967 if (use_rela_initialised
&& (use_rela
== TRUE
))
7970 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
7971 bfd_set_error (bfd_error_invalid_operation
);
7977 use_rela_initialised
= TRUE
;
7982 /* The section size is not divisible by either - something is wrong. */
7984 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
7985 bfd_set_error (bfd_error_invalid_operation
);
7990 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
7991 if (lo
->type
== bfd_indirect_link_order
)
7993 asection
*o
= lo
->u
.indirect
.section
;
7995 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
7997 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
7998 /* Section size is divisible by both rel and rela sizes.
7999 It is of no help to us. */
8003 /* Section size is only divisible by rela. */
8004 if (use_rela_initialised
&& (use_rela
== FALSE
))
8007 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8008 bfd_set_error (bfd_error_invalid_operation
);
8014 use_rela_initialised
= TRUE
;
8018 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8020 /* Section size is only divisible by rel. */
8021 if (use_rela_initialised
&& (use_rela
== TRUE
))
8024 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8025 bfd_set_error (bfd_error_invalid_operation
);
8031 use_rela_initialised
= TRUE
;
8036 /* The section size is not divisible by either - something is wrong. */
8038 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8039 bfd_set_error (bfd_error_invalid_operation
);
8044 if (! use_rela_initialised
)
8048 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
8050 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8057 dynamic_relocs
= rela_dyn
;
8058 ext_size
= bed
->s
->sizeof_rela
;
8059 swap_in
= bed
->s
->swap_reloca_in
;
8060 swap_out
= bed
->s
->swap_reloca_out
;
8064 dynamic_relocs
= rel_dyn
;
8065 ext_size
= bed
->s
->sizeof_rel
;
8066 swap_in
= bed
->s
->swap_reloc_in
;
8067 swap_out
= bed
->s
->swap_reloc_out
;
8071 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8072 if (lo
->type
== bfd_indirect_link_order
)
8073 size
+= lo
->u
.indirect
.section
->size
;
8075 if (size
!= dynamic_relocs
->size
)
8078 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8079 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8081 count
= dynamic_relocs
->size
/ ext_size
;
8082 sort
= bfd_zmalloc (sort_elt
* count
);
8086 (*info
->callbacks
->warning
)
8087 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8091 if (bed
->s
->arch_size
== 32)
8092 r_sym_mask
= ~(bfd_vma
) 0xff;
8094 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8096 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8097 if (lo
->type
== bfd_indirect_link_order
)
8099 bfd_byte
*erel
, *erelend
;
8100 asection
*o
= lo
->u
.indirect
.section
;
8102 if (o
->contents
== NULL
&& o
->size
!= 0)
8104 /* This is a reloc section that is being handled as a normal
8105 section. See bfd_section_from_shdr. We can't combine
8106 relocs in this case. */
8111 erelend
= o
->contents
+ o
->size
;
8112 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8114 while (erel
< erelend
)
8116 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8118 (*swap_in
) (abfd
, erel
, s
->rela
);
8119 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
8120 s
->u
.sym_mask
= r_sym_mask
;
8126 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8128 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8130 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8131 if (s
->type
!= reloc_class_relative
)
8137 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8138 for (; i
< count
; i
++, p
+= sort_elt
)
8140 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8141 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8143 sp
->u
.offset
= sq
->rela
->r_offset
;
8146 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8148 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8149 if (lo
->type
== bfd_indirect_link_order
)
8151 bfd_byte
*erel
, *erelend
;
8152 asection
*o
= lo
->u
.indirect
.section
;
8155 erelend
= o
->contents
+ o
->size
;
8156 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8157 while (erel
< erelend
)
8159 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8160 (*swap_out
) (abfd
, s
->rela
, erel
);
8167 *psec
= dynamic_relocs
;
8171 /* Flush the output symbols to the file. */
8174 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
8175 const struct elf_backend_data
*bed
)
8177 if (finfo
->symbuf_count
> 0)
8179 Elf_Internal_Shdr
*hdr
;
8183 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
8184 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
8185 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8186 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
8187 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
8190 hdr
->sh_size
+= amt
;
8191 finfo
->symbuf_count
= 0;
8197 /* Add a symbol to the output symbol table. */
8200 elf_link_output_sym (struct elf_final_link_info
*finfo
,
8202 Elf_Internal_Sym
*elfsym
,
8203 asection
*input_sec
,
8204 struct elf_link_hash_entry
*h
)
8207 Elf_External_Sym_Shndx
*destshndx
;
8208 int (*output_symbol_hook
)
8209 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8210 struct elf_link_hash_entry
*);
8211 const struct elf_backend_data
*bed
;
8213 bed
= get_elf_backend_data (finfo
->output_bfd
);
8214 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8215 if (output_symbol_hook
!= NULL
)
8217 int ret
= (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
);
8222 if (name
== NULL
|| *name
== '\0')
8223 elfsym
->st_name
= 0;
8224 else if (input_sec
->flags
& SEC_EXCLUDE
)
8225 elfsym
->st_name
= 0;
8228 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
8230 if (elfsym
->st_name
== (unsigned long) -1)
8234 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
8236 if (! elf_link_flush_output_syms (finfo
, bed
))
8240 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8241 destshndx
= finfo
->symshndxbuf
;
8242 if (destshndx
!= NULL
)
8244 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
8248 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
8249 destshndx
= bfd_realloc (destshndx
, amt
* 2);
8250 if (destshndx
== NULL
)
8252 finfo
->symshndxbuf
= destshndx
;
8253 memset ((char *) destshndx
+ amt
, 0, amt
);
8254 finfo
->shndxbuf_size
*= 2;
8256 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
8259 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
8260 finfo
->symbuf_count
+= 1;
8261 bfd_get_symcount (finfo
->output_bfd
) += 1;
8266 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8269 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
8271 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
8272 && sym
->st_shndx
< SHN_LORESERVE
)
8274 /* The gABI doesn't support dynamic symbols in output sections
8276 (*_bfd_error_handler
)
8277 (_("%B: Too many sections: %d (>= %d)"),
8278 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
8279 bfd_set_error (bfd_error_nonrepresentable_section
);
8285 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8286 allowing an unsatisfied unversioned symbol in the DSO to match a
8287 versioned symbol that would normally require an explicit version.
8288 We also handle the case that a DSO references a hidden symbol
8289 which may be satisfied by a versioned symbol in another DSO. */
8292 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
8293 const struct elf_backend_data
*bed
,
8294 struct elf_link_hash_entry
*h
)
8297 struct elf_link_loaded_list
*loaded
;
8299 if (!is_elf_hash_table (info
->hash
))
8302 switch (h
->root
.type
)
8308 case bfd_link_hash_undefined
:
8309 case bfd_link_hash_undefweak
:
8310 abfd
= h
->root
.u
.undef
.abfd
;
8311 if ((abfd
->flags
& DYNAMIC
) == 0
8312 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
8316 case bfd_link_hash_defined
:
8317 case bfd_link_hash_defweak
:
8318 abfd
= h
->root
.u
.def
.section
->owner
;
8321 case bfd_link_hash_common
:
8322 abfd
= h
->root
.u
.c
.p
->section
->owner
;
8325 BFD_ASSERT (abfd
!= NULL
);
8327 for (loaded
= elf_hash_table (info
)->loaded
;
8329 loaded
= loaded
->next
)
8332 Elf_Internal_Shdr
*hdr
;
8333 bfd_size_type symcount
;
8334 bfd_size_type extsymcount
;
8335 bfd_size_type extsymoff
;
8336 Elf_Internal_Shdr
*versymhdr
;
8337 Elf_Internal_Sym
*isym
;
8338 Elf_Internal_Sym
*isymend
;
8339 Elf_Internal_Sym
*isymbuf
;
8340 Elf_External_Versym
*ever
;
8341 Elf_External_Versym
*extversym
;
8343 input
= loaded
->abfd
;
8345 /* We check each DSO for a possible hidden versioned definition. */
8347 || (input
->flags
& DYNAMIC
) == 0
8348 || elf_dynversym (input
) == 0)
8351 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
8353 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8354 if (elf_bad_symtab (input
))
8356 extsymcount
= symcount
;
8361 extsymcount
= symcount
- hdr
->sh_info
;
8362 extsymoff
= hdr
->sh_info
;
8365 if (extsymcount
== 0)
8368 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
8370 if (isymbuf
== NULL
)
8373 /* Read in any version definitions. */
8374 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
8375 extversym
= bfd_malloc (versymhdr
->sh_size
);
8376 if (extversym
== NULL
)
8379 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
8380 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
8381 != versymhdr
->sh_size
))
8389 ever
= extversym
+ extsymoff
;
8390 isymend
= isymbuf
+ extsymcount
;
8391 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
8394 Elf_Internal_Versym iver
;
8395 unsigned short version_index
;
8397 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
8398 || isym
->st_shndx
== SHN_UNDEF
)
8401 name
= bfd_elf_string_from_elf_section (input
,
8404 if (strcmp (name
, h
->root
.root
.string
) != 0)
8407 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
8409 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
8411 /* If we have a non-hidden versioned sym, then it should
8412 have provided a definition for the undefined sym. */
8416 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
8417 if (version_index
== 1 || version_index
== 2)
8419 /* This is the base or first version. We can use it. */
8433 /* Add an external symbol to the symbol table. This is called from
8434 the hash table traversal routine. When generating a shared object,
8435 we go through the symbol table twice. The first time we output
8436 anything that might have been forced to local scope in a version
8437 script. The second time we output the symbols that are still
8441 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
8443 struct elf_outext_info
*eoinfo
= data
;
8444 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
8446 Elf_Internal_Sym sym
;
8447 asection
*input_sec
;
8448 const struct elf_backend_data
*bed
;
8452 if (h
->root
.type
== bfd_link_hash_warning
)
8454 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8455 if (h
->root
.type
== bfd_link_hash_new
)
8459 /* Decide whether to output this symbol in this pass. */
8460 if (eoinfo
->localsyms
)
8462 if (!h
->forced_local
)
8467 if (h
->forced_local
)
8471 bed
= get_elf_backend_data (finfo
->output_bfd
);
8473 if (h
->root
.type
== bfd_link_hash_undefined
)
8475 /* If we have an undefined symbol reference here then it must have
8476 come from a shared library that is being linked in. (Undefined
8477 references in regular files have already been handled). */
8478 bfd_boolean ignore_undef
= FALSE
;
8480 /* Some symbols may be special in that the fact that they're
8481 undefined can be safely ignored - let backend determine that. */
8482 if (bed
->elf_backend_ignore_undef_symbol
)
8483 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
8485 /* If we are reporting errors for this situation then do so now. */
8486 if (ignore_undef
== FALSE
8489 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
8490 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
8492 if (! (finfo
->info
->callbacks
->undefined_symbol
8493 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
8494 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
8496 eoinfo
->failed
= TRUE
;
8502 /* We should also warn if a forced local symbol is referenced from
8503 shared libraries. */
8504 if (! finfo
->info
->relocatable
8505 && (! finfo
->info
->shared
)
8510 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
8512 (*_bfd_error_handler
)
8513 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
8515 h
->root
.u
.def
.section
== bfd_abs_section_ptr
8516 ? finfo
->output_bfd
: h
->root
.u
.def
.section
->owner
,
8517 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
8519 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
8520 ? "hidden" : "local",
8521 h
->root
.root
.string
);
8522 eoinfo
->failed
= TRUE
;
8526 /* We don't want to output symbols that have never been mentioned by
8527 a regular file, or that we have been told to strip. However, if
8528 h->indx is set to -2, the symbol is used by a reloc and we must
8532 else if ((h
->def_dynamic
8534 || h
->root
.type
== bfd_link_hash_new
)
8538 else if (finfo
->info
->strip
== strip_all
)
8540 else if (finfo
->info
->strip
== strip_some
8541 && bfd_hash_lookup (finfo
->info
->keep_hash
,
8542 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
8544 else if (finfo
->info
->strip_discarded
8545 && (h
->root
.type
== bfd_link_hash_defined
8546 || h
->root
.type
== bfd_link_hash_defweak
)
8547 && elf_discarded_section (h
->root
.u
.def
.section
))
8552 /* If we're stripping it, and it's not a dynamic symbol, there's
8553 nothing else to do unless it is a forced local symbol. */
8556 && !h
->forced_local
)
8560 sym
.st_size
= h
->size
;
8561 sym
.st_other
= h
->other
;
8562 if (h
->forced_local
)
8563 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
8564 else if (h
->root
.type
== bfd_link_hash_undefweak
8565 || h
->root
.type
== bfd_link_hash_defweak
)
8566 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
8568 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
8570 switch (h
->root
.type
)
8573 case bfd_link_hash_new
:
8574 case bfd_link_hash_warning
:
8578 case bfd_link_hash_undefined
:
8579 case bfd_link_hash_undefweak
:
8580 input_sec
= bfd_und_section_ptr
;
8581 sym
.st_shndx
= SHN_UNDEF
;
8584 case bfd_link_hash_defined
:
8585 case bfd_link_hash_defweak
:
8587 input_sec
= h
->root
.u
.def
.section
;
8588 if (input_sec
->output_section
!= NULL
)
8591 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
8592 input_sec
->output_section
);
8593 if (sym
.st_shndx
== SHN_BAD
)
8595 (*_bfd_error_handler
)
8596 (_("%B: could not find output section %A for input section %A"),
8597 finfo
->output_bfd
, input_sec
->output_section
, input_sec
);
8598 eoinfo
->failed
= TRUE
;
8602 /* ELF symbols in relocatable files are section relative,
8603 but in nonrelocatable files they are virtual
8605 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
8606 if (! finfo
->info
->relocatable
)
8608 sym
.st_value
+= input_sec
->output_section
->vma
;
8609 if (h
->type
== STT_TLS
)
8611 asection
*tls_sec
= elf_hash_table (finfo
->info
)->tls_sec
;
8612 if (tls_sec
!= NULL
)
8613 sym
.st_value
-= tls_sec
->vma
;
8616 /* The TLS section may have been garbage collected. */
8617 BFD_ASSERT (finfo
->info
->gc_sections
8618 && !input_sec
->gc_mark
);
8625 BFD_ASSERT (input_sec
->owner
== NULL
8626 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
8627 sym
.st_shndx
= SHN_UNDEF
;
8628 input_sec
= bfd_und_section_ptr
;
8633 case bfd_link_hash_common
:
8634 input_sec
= h
->root
.u
.c
.p
->section
;
8635 sym
.st_shndx
= bed
->common_section_index (input_sec
);
8636 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
8639 case bfd_link_hash_indirect
:
8640 /* These symbols are created by symbol versioning. They point
8641 to the decorated version of the name. For example, if the
8642 symbol foo@@GNU_1.2 is the default, which should be used when
8643 foo is used with no version, then we add an indirect symbol
8644 foo which points to foo@@GNU_1.2. We ignore these symbols,
8645 since the indirected symbol is already in the hash table. */
8649 /* Give the processor backend a chance to tweak the symbol value,
8650 and also to finish up anything that needs to be done for this
8651 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8652 forced local syms when non-shared is due to a historical quirk. */
8653 if ((h
->dynindx
!= -1
8655 && ((finfo
->info
->shared
8656 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
8657 || h
->root
.type
!= bfd_link_hash_undefweak
))
8658 || !h
->forced_local
)
8659 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8661 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
8662 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
8664 eoinfo
->failed
= TRUE
;
8669 /* If we are marking the symbol as undefined, and there are no
8670 non-weak references to this symbol from a regular object, then
8671 mark the symbol as weak undefined; if there are non-weak
8672 references, mark the symbol as strong. We can't do this earlier,
8673 because it might not be marked as undefined until the
8674 finish_dynamic_symbol routine gets through with it. */
8675 if (sym
.st_shndx
== SHN_UNDEF
8677 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
8678 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
8682 if (h
->ref_regular_nonweak
)
8683 bindtype
= STB_GLOBAL
;
8685 bindtype
= STB_WEAK
;
8686 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
8689 /* If this is a symbol defined in a dynamic library, don't use the
8690 symbol size from the dynamic library. Relinking an executable
8691 against a new library may introduce gratuitous changes in the
8692 executable's symbols if we keep the size. */
8693 if (sym
.st_shndx
== SHN_UNDEF
8698 /* If a non-weak symbol with non-default visibility is not defined
8699 locally, it is a fatal error. */
8700 if (! finfo
->info
->relocatable
8701 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
8702 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
8703 && h
->root
.type
== bfd_link_hash_undefined
8706 (*_bfd_error_handler
)
8707 (_("%B: %s symbol `%s' isn't defined"),
8709 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
8711 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
8712 ? "internal" : "hidden",
8713 h
->root
.root
.string
);
8714 eoinfo
->failed
= TRUE
;
8718 /* If this symbol should be put in the .dynsym section, then put it
8719 there now. We already know the symbol index. We also fill in
8720 the entry in the .hash section. */
8721 if (h
->dynindx
!= -1
8722 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8726 sym
.st_name
= h
->dynstr_index
;
8727 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
8728 if (! check_dynsym (finfo
->output_bfd
, &sym
))
8730 eoinfo
->failed
= TRUE
;
8733 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
8735 if (finfo
->hash_sec
!= NULL
)
8737 size_t hash_entry_size
;
8738 bfd_byte
*bucketpos
;
8743 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
8744 bucket
= h
->u
.elf_hash_value
% bucketcount
;
8747 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
8748 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
8749 + (bucket
+ 2) * hash_entry_size
);
8750 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
8751 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
8752 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
8753 ((bfd_byte
*) finfo
->hash_sec
->contents
8754 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
8757 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
8759 Elf_Internal_Versym iversym
;
8760 Elf_External_Versym
*eversym
;
8762 if (!h
->def_regular
)
8764 if (h
->verinfo
.verdef
== NULL
)
8765 iversym
.vs_vers
= 0;
8767 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
8771 if (h
->verinfo
.vertree
== NULL
)
8772 iversym
.vs_vers
= 1;
8774 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
8775 if (finfo
->info
->create_default_symver
)
8780 iversym
.vs_vers
|= VERSYM_HIDDEN
;
8782 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
8783 eversym
+= h
->dynindx
;
8784 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
8788 /* If we're stripping it, then it was just a dynamic symbol, and
8789 there's nothing else to do. */
8790 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
8793 indx
= bfd_get_symcount (finfo
->output_bfd
);
8794 ret
= elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
);
8797 eoinfo
->failed
= TRUE
;
8802 else if (h
->indx
== -2)
8808 /* Return TRUE if special handling is done for relocs in SEC against
8809 symbols defined in discarded sections. */
8812 elf_section_ignore_discarded_relocs (asection
*sec
)
8814 const struct elf_backend_data
*bed
;
8816 switch (sec
->sec_info_type
)
8818 case ELF_INFO_TYPE_STABS
:
8819 case ELF_INFO_TYPE_EH_FRAME
:
8825 bed
= get_elf_backend_data (sec
->owner
);
8826 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8827 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
8833 /* Return a mask saying how ld should treat relocations in SEC against
8834 symbols defined in discarded sections. If this function returns
8835 COMPLAIN set, ld will issue a warning message. If this function
8836 returns PRETEND set, and the discarded section was link-once and the
8837 same size as the kept link-once section, ld will pretend that the
8838 symbol was actually defined in the kept section. Otherwise ld will
8839 zero the reloc (at least that is the intent, but some cooperation by
8840 the target dependent code is needed, particularly for REL targets). */
8843 _bfd_elf_default_action_discarded (asection
*sec
)
8845 if (sec
->flags
& SEC_DEBUGGING
)
8848 if (strcmp (".eh_frame", sec
->name
) == 0)
8851 if (strcmp (".gcc_except_table", sec
->name
) == 0)
8854 return COMPLAIN
| PRETEND
;
8857 /* Find a match between a section and a member of a section group. */
8860 match_group_member (asection
*sec
, asection
*group
,
8861 struct bfd_link_info
*info
)
8863 asection
*first
= elf_next_in_group (group
);
8864 asection
*s
= first
;
8868 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
8871 s
= elf_next_in_group (s
);
8879 /* Check if the kept section of a discarded section SEC can be used
8880 to replace it. Return the replacement if it is OK. Otherwise return
8884 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
8888 kept
= sec
->kept_section
;
8891 if ((kept
->flags
& SEC_GROUP
) != 0)
8892 kept
= match_group_member (sec
, kept
, info
);
8894 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
8895 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
8897 sec
->kept_section
= kept
;
8902 /* Link an input file into the linker output file. This function
8903 handles all the sections and relocations of the input file at once.
8904 This is so that we only have to read the local symbols once, and
8905 don't have to keep them in memory. */
8908 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
8910 int (*relocate_section
)
8911 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
8912 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
8914 Elf_Internal_Shdr
*symtab_hdr
;
8917 Elf_Internal_Sym
*isymbuf
;
8918 Elf_Internal_Sym
*isym
;
8919 Elf_Internal_Sym
*isymend
;
8921 asection
**ppsection
;
8923 const struct elf_backend_data
*bed
;
8924 struct elf_link_hash_entry
**sym_hashes
;
8926 output_bfd
= finfo
->output_bfd
;
8927 bed
= get_elf_backend_data (output_bfd
);
8928 relocate_section
= bed
->elf_backend_relocate_section
;
8930 /* If this is a dynamic object, we don't want to do anything here:
8931 we don't want the local symbols, and we don't want the section
8933 if ((input_bfd
->flags
& DYNAMIC
) != 0)
8936 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
8937 if (elf_bad_symtab (input_bfd
))
8939 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8944 locsymcount
= symtab_hdr
->sh_info
;
8945 extsymoff
= symtab_hdr
->sh_info
;
8948 /* Read the local symbols. */
8949 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8950 if (isymbuf
== NULL
&& locsymcount
!= 0)
8952 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
8953 finfo
->internal_syms
,
8954 finfo
->external_syms
,
8955 finfo
->locsym_shndx
);
8956 if (isymbuf
== NULL
)
8960 /* Find local symbol sections and adjust values of symbols in
8961 SEC_MERGE sections. Write out those local symbols we know are
8962 going into the output file. */
8963 isymend
= isymbuf
+ locsymcount
;
8964 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
8966 isym
++, pindex
++, ppsection
++)
8970 Elf_Internal_Sym osym
;
8976 if (elf_bad_symtab (input_bfd
))
8978 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
8985 if (isym
->st_shndx
== SHN_UNDEF
)
8986 isec
= bfd_und_section_ptr
;
8987 else if (isym
->st_shndx
== SHN_ABS
)
8988 isec
= bfd_abs_section_ptr
;
8989 else if (isym
->st_shndx
== SHN_COMMON
)
8990 isec
= bfd_com_section_ptr
;
8993 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
8996 /* Don't attempt to output symbols with st_shnx in the
8997 reserved range other than SHN_ABS and SHN_COMMON. */
9001 else if (isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
9002 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
9004 _bfd_merged_section_offset (output_bfd
, &isec
,
9005 elf_section_data (isec
)->sec_info
,
9011 /* Don't output the first, undefined, symbol. */
9012 if (ppsection
== finfo
->sections
)
9015 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
9017 /* We never output section symbols. Instead, we use the
9018 section symbol of the corresponding section in the output
9023 /* If we are stripping all symbols, we don't want to output this
9025 if (finfo
->info
->strip
== strip_all
)
9028 /* If we are discarding all local symbols, we don't want to
9029 output this one. If we are generating a relocatable output
9030 file, then some of the local symbols may be required by
9031 relocs; we output them below as we discover that they are
9033 if (finfo
->info
->discard
== discard_all
)
9036 /* If this symbol is defined in a section which we are
9037 discarding, we don't need to keep it. */
9038 if (isym
->st_shndx
!= SHN_UNDEF
9039 && isym
->st_shndx
< SHN_LORESERVE
9040 && bfd_section_removed_from_list (output_bfd
,
9041 isec
->output_section
))
9044 /* Get the name of the symbol. */
9045 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
9050 /* See if we are discarding symbols with this name. */
9051 if ((finfo
->info
->strip
== strip_some
9052 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
9054 || (((finfo
->info
->discard
== discard_sec_merge
9055 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
9056 || finfo
->info
->discard
== discard_l
)
9057 && bfd_is_local_label_name (input_bfd
, name
)))
9062 /* Adjust the section index for the output file. */
9063 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9064 isec
->output_section
);
9065 if (osym
.st_shndx
== SHN_BAD
)
9068 *pindex
= bfd_get_symcount (output_bfd
);
9070 /* ELF symbols in relocatable files are section relative, but
9071 in executable files they are virtual addresses. Note that
9072 this code assumes that all ELF sections have an associated
9073 BFD section with a reasonable value for output_offset; below
9074 we assume that they also have a reasonable value for
9075 output_section. Any special sections must be set up to meet
9076 these requirements. */
9077 osym
.st_value
+= isec
->output_offset
;
9078 if (! finfo
->info
->relocatable
)
9080 osym
.st_value
+= isec
->output_section
->vma
;
9081 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
9083 /* STT_TLS symbols are relative to PT_TLS segment base. */
9084 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
9085 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
9089 indx
= bfd_get_symcount (output_bfd
);
9090 ret
= elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
);
9097 /* Relocate the contents of each section. */
9098 sym_hashes
= elf_sym_hashes (input_bfd
);
9099 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
9103 if (! o
->linker_mark
)
9105 /* This section was omitted from the link. */
9109 if (finfo
->info
->relocatable
9110 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
9112 /* Deal with the group signature symbol. */
9113 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
9114 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
9115 asection
*osec
= o
->output_section
;
9117 if (symndx
>= locsymcount
9118 || (elf_bad_symtab (input_bfd
)
9119 && finfo
->sections
[symndx
] == NULL
))
9121 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
9122 while (h
->root
.type
== bfd_link_hash_indirect
9123 || h
->root
.type
== bfd_link_hash_warning
)
9124 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9125 /* Arrange for symbol to be output. */
9127 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
9129 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
9131 /* We'll use the output section target_index. */
9132 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9133 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
9137 if (finfo
->indices
[symndx
] == -1)
9139 /* Otherwise output the local symbol now. */
9140 Elf_Internal_Sym sym
= isymbuf
[symndx
];
9141 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9146 name
= bfd_elf_string_from_elf_section (input_bfd
,
9147 symtab_hdr
->sh_link
,
9152 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9154 if (sym
.st_shndx
== SHN_BAD
)
9157 sym
.st_value
+= o
->output_offset
;
9159 indx
= bfd_get_symcount (output_bfd
);
9160 ret
= elf_link_output_sym (finfo
, name
, &sym
, o
, NULL
);
9164 finfo
->indices
[symndx
] = indx
;
9168 elf_section_data (osec
)->this_hdr
.sh_info
9169 = finfo
->indices
[symndx
];
9173 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
9174 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
9177 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
9179 /* Section was created by _bfd_elf_link_create_dynamic_sections
9184 /* Get the contents of the section. They have been cached by a
9185 relaxation routine. Note that o is a section in an input
9186 file, so the contents field will not have been set by any of
9187 the routines which work on output files. */
9188 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
9189 contents
= elf_section_data (o
)->this_hdr
.contents
;
9192 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
9194 contents
= finfo
->contents
;
9195 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
9199 if ((o
->flags
& SEC_RELOC
) != 0)
9201 Elf_Internal_Rela
*internal_relocs
;
9202 Elf_Internal_Rela
*rel
, *relend
;
9203 bfd_vma r_type_mask
;
9205 int action_discarded
;
9208 /* Get the swapped relocs. */
9210 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
9211 finfo
->internal_relocs
, FALSE
);
9212 if (internal_relocs
== NULL
9213 && o
->reloc_count
> 0)
9216 if (bed
->s
->arch_size
== 32)
9223 r_type_mask
= 0xffffffff;
9227 action_discarded
= -1;
9228 if (!elf_section_ignore_discarded_relocs (o
))
9229 action_discarded
= (*bed
->action_discarded
) (o
);
9231 /* Run through the relocs evaluating complex reloc symbols and
9232 looking for relocs against symbols from discarded sections
9233 or section symbols from removed link-once sections.
9234 Complain about relocs against discarded sections. Zero
9235 relocs against removed link-once sections. */
9237 rel
= internal_relocs
;
9238 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9239 for ( ; rel
< relend
; rel
++)
9241 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
9242 unsigned int s_type
;
9243 asection
**ps
, *sec
;
9244 struct elf_link_hash_entry
*h
= NULL
;
9245 const char *sym_name
;
9247 if (r_symndx
== STN_UNDEF
)
9250 if (r_symndx
>= locsymcount
9251 || (elf_bad_symtab (input_bfd
)
9252 && finfo
->sections
[r_symndx
] == NULL
))
9254 h
= sym_hashes
[r_symndx
- extsymoff
];
9256 /* Badly formatted input files can contain relocs that
9257 reference non-existant symbols. Check here so that
9258 we do not seg fault. */
9263 sprintf_vma (buffer
, rel
->r_info
);
9264 (*_bfd_error_handler
)
9265 (_("error: %B contains a reloc (0x%s) for section %A "
9266 "that references a non-existent global symbol"),
9267 input_bfd
, o
, buffer
);
9268 bfd_set_error (bfd_error_bad_value
);
9272 while (h
->root
.type
== bfd_link_hash_indirect
9273 || h
->root
.type
== bfd_link_hash_warning
)
9274 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9279 if (h
->root
.type
== bfd_link_hash_defined
9280 || h
->root
.type
== bfd_link_hash_defweak
)
9281 ps
= &h
->root
.u
.def
.section
;
9283 sym_name
= h
->root
.root
.string
;
9287 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
9289 s_type
= ELF_ST_TYPE (sym
->st_info
);
9290 ps
= &finfo
->sections
[r_symndx
];
9291 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
9295 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
9296 && !finfo
->info
->relocatable
)
9299 bfd_vma dot
= (rel
->r_offset
9300 + o
->output_offset
+ o
->output_section
->vma
);
9302 printf ("Encountered a complex symbol!");
9303 printf (" (input_bfd %s, section %s, reloc %ld\n",
9304 input_bfd
->filename
, o
->name
, rel
- internal_relocs
);
9305 printf (" symbol: idx %8.8lx, name %s\n",
9306 r_symndx
, sym_name
);
9307 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9308 (unsigned long) rel
->r_info
,
9309 (unsigned long) rel
->r_offset
);
9311 if (!eval_symbol (&val
, &sym_name
, input_bfd
, finfo
, dot
,
9312 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
9315 /* Symbol evaluated OK. Update to absolute value. */
9316 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
9321 if (action_discarded
!= -1 && ps
!= NULL
)
9323 /* Complain if the definition comes from a
9324 discarded section. */
9325 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
9327 BFD_ASSERT (r_symndx
!= 0);
9328 if (action_discarded
& COMPLAIN
)
9329 (*finfo
->info
->callbacks
->einfo
)
9330 (_("%X`%s' referenced in section `%A' of %B: "
9331 "defined in discarded section `%A' of %B\n"),
9332 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
9334 /* Try to do the best we can to support buggy old
9335 versions of gcc. Pretend that the symbol is
9336 really defined in the kept linkonce section.
9337 FIXME: This is quite broken. Modifying the
9338 symbol here means we will be changing all later
9339 uses of the symbol, not just in this section. */
9340 if (action_discarded
& PRETEND
)
9344 kept
= _bfd_elf_check_kept_section (sec
,
9356 /* Relocate the section by invoking a back end routine.
9358 The back end routine is responsible for adjusting the
9359 section contents as necessary, and (if using Rela relocs
9360 and generating a relocatable output file) adjusting the
9361 reloc addend as necessary.
9363 The back end routine does not have to worry about setting
9364 the reloc address or the reloc symbol index.
9366 The back end routine is given a pointer to the swapped in
9367 internal symbols, and can access the hash table entries
9368 for the external symbols via elf_sym_hashes (input_bfd).
9370 When generating relocatable output, the back end routine
9371 must handle STB_LOCAL/STT_SECTION symbols specially. The
9372 output symbol is going to be a section symbol
9373 corresponding to the output section, which will require
9374 the addend to be adjusted. */
9376 ret
= (*relocate_section
) (output_bfd
, finfo
->info
,
9377 input_bfd
, o
, contents
,
9385 || finfo
->info
->relocatable
9386 || finfo
->info
->emitrelocations
)
9388 Elf_Internal_Rela
*irela
;
9389 Elf_Internal_Rela
*irelaend
;
9390 bfd_vma last_offset
;
9391 struct elf_link_hash_entry
**rel_hash
;
9392 struct elf_link_hash_entry
**rel_hash_list
;
9393 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
9394 unsigned int next_erel
;
9395 bfd_boolean rela_normal
;
9397 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
9398 rela_normal
= (bed
->rela_normal
9399 && (input_rel_hdr
->sh_entsize
9400 == bed
->s
->sizeof_rela
));
9402 /* Adjust the reloc addresses and symbol indices. */
9404 irela
= internal_relocs
;
9405 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9406 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
9407 + elf_section_data (o
->output_section
)->rel_count
9408 + elf_section_data (o
->output_section
)->rel_count2
);
9409 rel_hash_list
= rel_hash
;
9410 last_offset
= o
->output_offset
;
9411 if (!finfo
->info
->relocatable
)
9412 last_offset
+= o
->output_section
->vma
;
9413 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
9415 unsigned long r_symndx
;
9417 Elf_Internal_Sym sym
;
9419 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
9425 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
9428 if (irela
->r_offset
>= (bfd_vma
) -2)
9430 /* This is a reloc for a deleted entry or somesuch.
9431 Turn it into an R_*_NONE reloc, at the same
9432 offset as the last reloc. elf_eh_frame.c and
9433 bfd_elf_discard_info rely on reloc offsets
9435 irela
->r_offset
= last_offset
;
9437 irela
->r_addend
= 0;
9441 irela
->r_offset
+= o
->output_offset
;
9443 /* Relocs in an executable have to be virtual addresses. */
9444 if (!finfo
->info
->relocatable
)
9445 irela
->r_offset
+= o
->output_section
->vma
;
9447 last_offset
= irela
->r_offset
;
9449 r_symndx
= irela
->r_info
>> r_sym_shift
;
9450 if (r_symndx
== STN_UNDEF
)
9453 if (r_symndx
>= locsymcount
9454 || (elf_bad_symtab (input_bfd
)
9455 && finfo
->sections
[r_symndx
] == NULL
))
9457 struct elf_link_hash_entry
*rh
;
9460 /* This is a reloc against a global symbol. We
9461 have not yet output all the local symbols, so
9462 we do not know the symbol index of any global
9463 symbol. We set the rel_hash entry for this
9464 reloc to point to the global hash table entry
9465 for this symbol. The symbol index is then
9466 set at the end of bfd_elf_final_link. */
9467 indx
= r_symndx
- extsymoff
;
9468 rh
= elf_sym_hashes (input_bfd
)[indx
];
9469 while (rh
->root
.type
== bfd_link_hash_indirect
9470 || rh
->root
.type
== bfd_link_hash_warning
)
9471 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
9473 /* Setting the index to -2 tells
9474 elf_link_output_extsym that this symbol is
9476 BFD_ASSERT (rh
->indx
< 0);
9484 /* This is a reloc against a local symbol. */
9487 sym
= isymbuf
[r_symndx
];
9488 sec
= finfo
->sections
[r_symndx
];
9489 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
9491 /* I suppose the backend ought to fill in the
9492 section of any STT_SECTION symbol against a
9493 processor specific section. */
9495 if (bfd_is_abs_section (sec
))
9497 else if (sec
== NULL
|| sec
->owner
== NULL
)
9499 bfd_set_error (bfd_error_bad_value
);
9504 asection
*osec
= sec
->output_section
;
9506 /* If we have discarded a section, the output
9507 section will be the absolute section. In
9508 case of discarded SEC_MERGE sections, use
9509 the kept section. relocate_section should
9510 have already handled discarded linkonce
9512 if (bfd_is_abs_section (osec
)
9513 && sec
->kept_section
!= NULL
9514 && sec
->kept_section
->output_section
!= NULL
)
9516 osec
= sec
->kept_section
->output_section
;
9517 irela
->r_addend
-= osec
->vma
;
9520 if (!bfd_is_abs_section (osec
))
9522 r_symndx
= osec
->target_index
;
9525 struct elf_link_hash_table
*htab
;
9528 htab
= elf_hash_table (finfo
->info
);
9529 oi
= htab
->text_index_section
;
9530 if ((osec
->flags
& SEC_READONLY
) == 0
9531 && htab
->data_index_section
!= NULL
)
9532 oi
= htab
->data_index_section
;
9536 irela
->r_addend
+= osec
->vma
- oi
->vma
;
9537 r_symndx
= oi
->target_index
;
9541 BFD_ASSERT (r_symndx
!= 0);
9545 /* Adjust the addend according to where the
9546 section winds up in the output section. */
9548 irela
->r_addend
+= sec
->output_offset
;
9552 if (finfo
->indices
[r_symndx
] == -1)
9554 unsigned long shlink
;
9559 if (finfo
->info
->strip
== strip_all
)
9561 /* You can't do ld -r -s. */
9562 bfd_set_error (bfd_error_invalid_operation
);
9566 /* This symbol was skipped earlier, but
9567 since it is needed by a reloc, we
9568 must output it now. */
9569 shlink
= symtab_hdr
->sh_link
;
9570 name
= (bfd_elf_string_from_elf_section
9571 (input_bfd
, shlink
, sym
.st_name
));
9575 osec
= sec
->output_section
;
9577 _bfd_elf_section_from_bfd_section (output_bfd
,
9579 if (sym
.st_shndx
== SHN_BAD
)
9582 sym
.st_value
+= sec
->output_offset
;
9583 if (! finfo
->info
->relocatable
)
9585 sym
.st_value
+= osec
->vma
;
9586 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
9588 /* STT_TLS symbols are relative to PT_TLS
9590 BFD_ASSERT (elf_hash_table (finfo
->info
)
9592 sym
.st_value
-= (elf_hash_table (finfo
->info
)
9597 indx
= bfd_get_symcount (output_bfd
);
9598 ret
= elf_link_output_sym (finfo
, name
, &sym
, sec
,
9603 finfo
->indices
[r_symndx
] = indx
;
9608 r_symndx
= finfo
->indices
[r_symndx
];
9611 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
9612 | (irela
->r_info
& r_type_mask
));
9615 /* Swap out the relocs. */
9616 if (input_rel_hdr
->sh_size
!= 0
9617 && !bed
->elf_backend_emit_relocs (output_bfd
, o
,
9623 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
9624 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
9626 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
9627 * bed
->s
->int_rels_per_ext_rel
);
9628 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
9629 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9638 /* Write out the modified section contents. */
9639 if (bed
->elf_backend_write_section
9640 && (*bed
->elf_backend_write_section
) (output_bfd
, finfo
->info
, o
,
9643 /* Section written out. */
9645 else switch (o
->sec_info_type
)
9647 case ELF_INFO_TYPE_STABS
:
9648 if (! (_bfd_write_section_stabs
9650 &elf_hash_table (finfo
->info
)->stab_info
,
9651 o
, &elf_section_data (o
)->sec_info
, contents
)))
9654 case ELF_INFO_TYPE_MERGE
:
9655 if (! _bfd_write_merged_section (output_bfd
, o
,
9656 elf_section_data (o
)->sec_info
))
9659 case ELF_INFO_TYPE_EH_FRAME
:
9661 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
9668 if (! (o
->flags
& SEC_EXCLUDE
)
9669 && ! (o
->output_section
->flags
& SEC_NEVER_LOAD
)
9670 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
9672 (file_ptr
) o
->output_offset
,
9683 /* Generate a reloc when linking an ELF file. This is a reloc
9684 requested by the linker, and does not come from any input file. This
9685 is used to build constructor and destructor tables when linking
9689 elf_reloc_link_order (bfd
*output_bfd
,
9690 struct bfd_link_info
*info
,
9691 asection
*output_section
,
9692 struct bfd_link_order
*link_order
)
9694 reloc_howto_type
*howto
;
9698 struct elf_link_hash_entry
**rel_hash_ptr
;
9699 Elf_Internal_Shdr
*rel_hdr
;
9700 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
9701 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
9705 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
9708 bfd_set_error (bfd_error_bad_value
);
9712 addend
= link_order
->u
.reloc
.p
->addend
;
9714 /* Figure out the symbol index. */
9715 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
9716 + elf_section_data (output_section
)->rel_count
9717 + elf_section_data (output_section
)->rel_count2
);
9718 if (link_order
->type
== bfd_section_reloc_link_order
)
9720 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
9721 BFD_ASSERT (indx
!= 0);
9722 *rel_hash_ptr
= NULL
;
9726 struct elf_link_hash_entry
*h
;
9728 /* Treat a reloc against a defined symbol as though it were
9729 actually against the section. */
9730 h
= ((struct elf_link_hash_entry
*)
9731 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
9732 link_order
->u
.reloc
.p
->u
.name
,
9733 FALSE
, FALSE
, TRUE
));
9735 && (h
->root
.type
== bfd_link_hash_defined
9736 || h
->root
.type
== bfd_link_hash_defweak
))
9740 section
= h
->root
.u
.def
.section
;
9741 indx
= section
->output_section
->target_index
;
9742 *rel_hash_ptr
= NULL
;
9743 /* It seems that we ought to add the symbol value to the
9744 addend here, but in practice it has already been added
9745 because it was passed to constructor_callback. */
9746 addend
+= section
->output_section
->vma
+ section
->output_offset
;
9750 /* Setting the index to -2 tells elf_link_output_extsym that
9751 this symbol is used by a reloc. */
9758 if (! ((*info
->callbacks
->unattached_reloc
)
9759 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
9765 /* If this is an inplace reloc, we must write the addend into the
9767 if (howto
->partial_inplace
&& addend
!= 0)
9770 bfd_reloc_status_type rstat
;
9773 const char *sym_name
;
9775 size
= bfd_get_reloc_size (howto
);
9776 buf
= bfd_zmalloc (size
);
9779 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
9786 case bfd_reloc_outofrange
:
9789 case bfd_reloc_overflow
:
9790 if (link_order
->type
== bfd_section_reloc_link_order
)
9791 sym_name
= bfd_section_name (output_bfd
,
9792 link_order
->u
.reloc
.p
->u
.section
);
9794 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
9795 if (! ((*info
->callbacks
->reloc_overflow
)
9796 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
9797 NULL
, (bfd_vma
) 0)))
9804 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
9805 link_order
->offset
, size
);
9811 /* The address of a reloc is relative to the section in a
9812 relocatable file, and is a virtual address in an executable
9814 offset
= link_order
->offset
;
9815 if (! info
->relocatable
)
9816 offset
+= output_section
->vma
;
9818 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
9820 irel
[i
].r_offset
= offset
;
9822 irel
[i
].r_addend
= 0;
9824 if (bed
->s
->arch_size
== 32)
9825 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
9827 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
9829 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
9830 erel
= rel_hdr
->contents
;
9831 if (rel_hdr
->sh_type
== SHT_REL
)
9833 erel
+= (elf_section_data (output_section
)->rel_count
9834 * bed
->s
->sizeof_rel
);
9835 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
9839 irel
[0].r_addend
= addend
;
9840 erel
+= (elf_section_data (output_section
)->rel_count
9841 * bed
->s
->sizeof_rela
);
9842 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
9845 ++elf_section_data (output_section
)->rel_count
;
9851 /* Get the output vma of the section pointed to by the sh_link field. */
9854 elf_get_linked_section_vma (struct bfd_link_order
*p
)
9856 Elf_Internal_Shdr
**elf_shdrp
;
9860 s
= p
->u
.indirect
.section
;
9861 elf_shdrp
= elf_elfsections (s
->owner
);
9862 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
9863 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
9865 The Intel C compiler generates SHT_IA_64_UNWIND with
9866 SHF_LINK_ORDER. But it doesn't set the sh_link or
9867 sh_info fields. Hence we could get the situation
9868 where elfsec is 0. */
9871 const struct elf_backend_data
*bed
9872 = get_elf_backend_data (s
->owner
);
9873 if (bed
->link_order_error_handler
)
9874 bed
->link_order_error_handler
9875 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
9880 s
= elf_shdrp
[elfsec
]->bfd_section
;
9881 return s
->output_section
->vma
+ s
->output_offset
;
9886 /* Compare two sections based on the locations of the sections they are
9887 linked to. Used by elf_fixup_link_order. */
9890 compare_link_order (const void * a
, const void * b
)
9895 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
9896 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
9903 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
9904 order as their linked sections. Returns false if this could not be done
9905 because an output section includes both ordered and unordered
9906 sections. Ideally we'd do this in the linker proper. */
9909 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
9914 struct bfd_link_order
*p
;
9916 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9918 struct bfd_link_order
**sections
;
9919 asection
*s
, *other_sec
, *linkorder_sec
;
9923 linkorder_sec
= NULL
;
9926 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
9928 if (p
->type
== bfd_indirect_link_order
)
9930 s
= p
->u
.indirect
.section
;
9932 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
9933 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
9934 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
9935 && elfsec
< elf_numsections (sub
)
9936 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
9937 && elf_elfsections (sub
)[elfsec
]->sh_link
< elf_numsections (sub
))
9951 if (seen_other
&& seen_linkorder
)
9953 if (other_sec
&& linkorder_sec
)
9954 (*_bfd_error_handler
) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
9956 linkorder_sec
->owner
, other_sec
,
9959 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
9961 bfd_set_error (bfd_error_bad_value
);
9966 if (!seen_linkorder
)
9969 sections
= (struct bfd_link_order
**)
9970 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
9971 if (sections
== NULL
)
9975 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
9977 sections
[seen_linkorder
++] = p
;
9979 /* Sort the input sections in the order of their linked section. */
9980 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
9981 compare_link_order
);
9983 /* Change the offsets of the sections. */
9985 for (n
= 0; n
< seen_linkorder
; n
++)
9987 s
= sections
[n
]->u
.indirect
.section
;
9988 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
9989 s
->output_offset
= offset
;
9990 sections
[n
]->offset
= offset
;
9991 offset
+= sections
[n
]->size
;
9999 /* Do the final step of an ELF link. */
10002 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
10004 bfd_boolean dynamic
;
10005 bfd_boolean emit_relocs
;
10007 struct elf_final_link_info finfo
;
10008 register asection
*o
;
10009 register struct bfd_link_order
*p
;
10011 bfd_size_type max_contents_size
;
10012 bfd_size_type max_external_reloc_size
;
10013 bfd_size_type max_internal_reloc_count
;
10014 bfd_size_type max_sym_count
;
10015 bfd_size_type max_sym_shndx_count
;
10017 Elf_Internal_Sym elfsym
;
10019 Elf_Internal_Shdr
*symtab_hdr
;
10020 Elf_Internal_Shdr
*symtab_shndx_hdr
;
10021 Elf_Internal_Shdr
*symstrtab_hdr
;
10022 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10023 struct elf_outext_info eoinfo
;
10024 bfd_boolean merged
;
10025 size_t relativecount
= 0;
10026 asection
*reldyn
= 0;
10028 asection
*attr_section
= NULL
;
10029 bfd_vma attr_size
= 0;
10030 const char *std_attrs_section
;
10032 if (! is_elf_hash_table (info
->hash
))
10036 abfd
->flags
|= DYNAMIC
;
10038 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
10039 dynobj
= elf_hash_table (info
)->dynobj
;
10041 emit_relocs
= (info
->relocatable
10042 || info
->emitrelocations
);
10045 finfo
.output_bfd
= abfd
;
10046 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
10047 if (finfo
.symstrtab
== NULL
)
10052 finfo
.dynsym_sec
= NULL
;
10053 finfo
.hash_sec
= NULL
;
10054 finfo
.symver_sec
= NULL
;
10058 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
10059 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
10060 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
);
10061 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
10062 /* Note that it is OK if symver_sec is NULL. */
10065 finfo
.contents
= NULL
;
10066 finfo
.external_relocs
= NULL
;
10067 finfo
.internal_relocs
= NULL
;
10068 finfo
.external_syms
= NULL
;
10069 finfo
.locsym_shndx
= NULL
;
10070 finfo
.internal_syms
= NULL
;
10071 finfo
.indices
= NULL
;
10072 finfo
.sections
= NULL
;
10073 finfo
.symbuf
= NULL
;
10074 finfo
.symshndxbuf
= NULL
;
10075 finfo
.symbuf_count
= 0;
10076 finfo
.shndxbuf_size
= 0;
10078 /* The object attributes have been merged. Remove the input
10079 sections from the link, and set the contents of the output
10081 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
10082 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10084 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
10085 || strcmp (o
->name
, ".gnu.attributes") == 0)
10087 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10089 asection
*input_section
;
10091 if (p
->type
!= bfd_indirect_link_order
)
10093 input_section
= p
->u
.indirect
.section
;
10094 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10095 elf_link_input_bfd ignores this section. */
10096 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
10099 attr_size
= bfd_elf_obj_attr_size (abfd
);
10102 bfd_set_section_size (abfd
, o
, attr_size
);
10104 /* Skip this section later on. */
10105 o
->map_head
.link_order
= NULL
;
10108 o
->flags
|= SEC_EXCLUDE
;
10112 /* Count up the number of relocations we will output for each output
10113 section, so that we know the sizes of the reloc sections. We
10114 also figure out some maximum sizes. */
10115 max_contents_size
= 0;
10116 max_external_reloc_size
= 0;
10117 max_internal_reloc_count
= 0;
10119 max_sym_shndx_count
= 0;
10121 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10123 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10124 o
->reloc_count
= 0;
10126 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10128 unsigned int reloc_count
= 0;
10129 struct bfd_elf_section_data
*esdi
= NULL
;
10130 unsigned int *rel_count1
;
10132 if (p
->type
== bfd_section_reloc_link_order
10133 || p
->type
== bfd_symbol_reloc_link_order
)
10135 else if (p
->type
== bfd_indirect_link_order
)
10139 sec
= p
->u
.indirect
.section
;
10140 esdi
= elf_section_data (sec
);
10142 /* Mark all sections which are to be included in the
10143 link. This will normally be every section. We need
10144 to do this so that we can identify any sections which
10145 the linker has decided to not include. */
10146 sec
->linker_mark
= TRUE
;
10148 if (sec
->flags
& SEC_MERGE
)
10151 if (info
->relocatable
|| info
->emitrelocations
)
10152 reloc_count
= sec
->reloc_count
;
10153 else if (bed
->elf_backend_count_relocs
)
10154 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
10156 if (sec
->rawsize
> max_contents_size
)
10157 max_contents_size
= sec
->rawsize
;
10158 if (sec
->size
> max_contents_size
)
10159 max_contents_size
= sec
->size
;
10161 /* We are interested in just local symbols, not all
10163 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
10164 && (sec
->owner
->flags
& DYNAMIC
) == 0)
10168 if (elf_bad_symtab (sec
->owner
))
10169 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
10170 / bed
->s
->sizeof_sym
);
10172 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
10174 if (sym_count
> max_sym_count
)
10175 max_sym_count
= sym_count
;
10177 if (sym_count
> max_sym_shndx_count
10178 && elf_symtab_shndx (sec
->owner
) != 0)
10179 max_sym_shndx_count
= sym_count
;
10181 if ((sec
->flags
& SEC_RELOC
) != 0)
10185 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
10186 if (ext_size
> max_external_reloc_size
)
10187 max_external_reloc_size
= ext_size
;
10188 if (sec
->reloc_count
> max_internal_reloc_count
)
10189 max_internal_reloc_count
= sec
->reloc_count
;
10194 if (reloc_count
== 0)
10197 o
->reloc_count
+= reloc_count
;
10199 /* MIPS may have a mix of REL and RELA relocs on sections.
10200 To support this curious ABI we keep reloc counts in
10201 elf_section_data too. We must be careful to add the
10202 relocations from the input section to the right output
10203 count. FIXME: Get rid of one count. We have
10204 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
10205 rel_count1
= &esdo
->rel_count
;
10208 bfd_boolean same_size
;
10209 bfd_size_type entsize1
;
10211 entsize1
= esdi
->rel_hdr
.sh_entsize
;
10212 /* PR 9827: If the header size has not been set yet then
10213 assume that it will match the output section's reloc type. */
10215 entsize1
= o
->use_rela_p
? bed
->s
->sizeof_rela
: bed
->s
->sizeof_rel
;
10217 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
10218 || entsize1
== bed
->s
->sizeof_rela
);
10219 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
10222 rel_count1
= &esdo
->rel_count2
;
10224 if (esdi
->rel_hdr2
!= NULL
)
10226 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
10227 unsigned int alt_count
;
10228 unsigned int *rel_count2
;
10230 BFD_ASSERT (entsize2
!= entsize1
10231 && (entsize2
== bed
->s
->sizeof_rel
10232 || entsize2
== bed
->s
->sizeof_rela
));
10234 rel_count2
= &esdo
->rel_count2
;
10236 rel_count2
= &esdo
->rel_count
;
10238 /* The following is probably too simplistic if the
10239 backend counts output relocs unusually. */
10240 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
10241 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
10242 *rel_count2
+= alt_count
;
10243 reloc_count
-= alt_count
;
10246 *rel_count1
+= reloc_count
;
10249 if (o
->reloc_count
> 0)
10250 o
->flags
|= SEC_RELOC
;
10253 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10254 set it (this is probably a bug) and if it is set
10255 assign_section_numbers will create a reloc section. */
10256 o
->flags
&=~ SEC_RELOC
;
10259 /* If the SEC_ALLOC flag is not set, force the section VMA to
10260 zero. This is done in elf_fake_sections as well, but forcing
10261 the VMA to 0 here will ensure that relocs against these
10262 sections are handled correctly. */
10263 if ((o
->flags
& SEC_ALLOC
) == 0
10264 && ! o
->user_set_vma
)
10268 if (! info
->relocatable
&& merged
)
10269 elf_link_hash_traverse (elf_hash_table (info
),
10270 _bfd_elf_link_sec_merge_syms
, abfd
);
10272 /* Figure out the file positions for everything but the symbol table
10273 and the relocs. We set symcount to force assign_section_numbers
10274 to create a symbol table. */
10275 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
10276 BFD_ASSERT (! abfd
->output_has_begun
);
10277 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
10280 /* Set sizes, and assign file positions for reloc sections. */
10281 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10283 if ((o
->flags
& SEC_RELOC
) != 0)
10285 if (!(_bfd_elf_link_size_reloc_section
10286 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
10289 if (elf_section_data (o
)->rel_hdr2
10290 && !(_bfd_elf_link_size_reloc_section
10291 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
10295 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10296 to count upwards while actually outputting the relocations. */
10297 elf_section_data (o
)->rel_count
= 0;
10298 elf_section_data (o
)->rel_count2
= 0;
10301 _bfd_elf_assign_file_positions_for_relocs (abfd
);
10303 /* We have now assigned file positions for all the sections except
10304 .symtab and .strtab. We start the .symtab section at the current
10305 file position, and write directly to it. We build the .strtab
10306 section in memory. */
10307 bfd_get_symcount (abfd
) = 0;
10308 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10309 /* sh_name is set in prep_headers. */
10310 symtab_hdr
->sh_type
= SHT_SYMTAB
;
10311 /* sh_flags, sh_addr and sh_size all start off zero. */
10312 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
10313 /* sh_link is set in assign_section_numbers. */
10314 /* sh_info is set below. */
10315 /* sh_offset is set just below. */
10316 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
10318 off
= elf_tdata (abfd
)->next_file_pos
;
10319 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
10321 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10322 incorrect. We do not yet know the size of the .symtab section.
10323 We correct next_file_pos below, after we do know the size. */
10325 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10326 continuously seeking to the right position in the file. */
10327 if (! info
->keep_memory
|| max_sym_count
< 20)
10328 finfo
.symbuf_size
= 20;
10330 finfo
.symbuf_size
= max_sym_count
;
10331 amt
= finfo
.symbuf_size
;
10332 amt
*= bed
->s
->sizeof_sym
;
10333 finfo
.symbuf
= bfd_malloc (amt
);
10334 if (finfo
.symbuf
== NULL
)
10336 if (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF))
10338 /* Wild guess at number of output symbols. realloc'd as needed. */
10339 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
10340 finfo
.shndxbuf_size
= amt
;
10341 amt
*= sizeof (Elf_External_Sym_Shndx
);
10342 finfo
.symshndxbuf
= bfd_zmalloc (amt
);
10343 if (finfo
.symshndxbuf
== NULL
)
10347 /* Start writing out the symbol table. The first symbol is always a
10349 if (info
->strip
!= strip_all
10352 elfsym
.st_value
= 0;
10353 elfsym
.st_size
= 0;
10354 elfsym
.st_info
= 0;
10355 elfsym
.st_other
= 0;
10356 elfsym
.st_shndx
= SHN_UNDEF
;
10357 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
10362 /* Output a symbol for each section. We output these even if we are
10363 discarding local symbols, since they are used for relocs. These
10364 symbols have no names. We store the index of each one in the
10365 index field of the section, so that we can find it again when
10366 outputting relocs. */
10367 if (info
->strip
!= strip_all
10370 elfsym
.st_size
= 0;
10371 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10372 elfsym
.st_other
= 0;
10373 elfsym
.st_value
= 0;
10374 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10376 o
= bfd_section_from_elf_index (abfd
, i
);
10379 o
->target_index
= bfd_get_symcount (abfd
);
10380 elfsym
.st_shndx
= i
;
10381 if (!info
->relocatable
)
10382 elfsym
.st_value
= o
->vma
;
10383 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
) != 1)
10389 /* Allocate some memory to hold information read in from the input
10391 if (max_contents_size
!= 0)
10393 finfo
.contents
= bfd_malloc (max_contents_size
);
10394 if (finfo
.contents
== NULL
)
10398 if (max_external_reloc_size
!= 0)
10400 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
10401 if (finfo
.external_relocs
== NULL
)
10405 if (max_internal_reloc_count
!= 0)
10407 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10408 amt
*= sizeof (Elf_Internal_Rela
);
10409 finfo
.internal_relocs
= bfd_malloc (amt
);
10410 if (finfo
.internal_relocs
== NULL
)
10414 if (max_sym_count
!= 0)
10416 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
10417 finfo
.external_syms
= bfd_malloc (amt
);
10418 if (finfo
.external_syms
== NULL
)
10421 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
10422 finfo
.internal_syms
= bfd_malloc (amt
);
10423 if (finfo
.internal_syms
== NULL
)
10426 amt
= max_sym_count
* sizeof (long);
10427 finfo
.indices
= bfd_malloc (amt
);
10428 if (finfo
.indices
== NULL
)
10431 amt
= max_sym_count
* sizeof (asection
*);
10432 finfo
.sections
= bfd_malloc (amt
);
10433 if (finfo
.sections
== NULL
)
10437 if (max_sym_shndx_count
!= 0)
10439 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
10440 finfo
.locsym_shndx
= bfd_malloc (amt
);
10441 if (finfo
.locsym_shndx
== NULL
)
10445 if (elf_hash_table (info
)->tls_sec
)
10447 bfd_vma base
, end
= 0;
10450 for (sec
= elf_hash_table (info
)->tls_sec
;
10451 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
10454 bfd_size_type size
= sec
->size
;
10457 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
10459 struct bfd_link_order
*o
= sec
->map_tail
.link_order
;
10461 size
= o
->offset
+ o
->size
;
10463 end
= sec
->vma
+ size
;
10465 base
= elf_hash_table (info
)->tls_sec
->vma
;
10466 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
10467 elf_hash_table (info
)->tls_size
= end
- base
;
10470 /* Reorder SHF_LINK_ORDER sections. */
10471 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10473 if (!elf_fixup_link_order (abfd
, o
))
10477 /* Since ELF permits relocations to be against local symbols, we
10478 must have the local symbols available when we do the relocations.
10479 Since we would rather only read the local symbols once, and we
10480 would rather not keep them in memory, we handle all the
10481 relocations for a single input file at the same time.
10483 Unfortunately, there is no way to know the total number of local
10484 symbols until we have seen all of them, and the local symbol
10485 indices precede the global symbol indices. This means that when
10486 we are generating relocatable output, and we see a reloc against
10487 a global symbol, we can not know the symbol index until we have
10488 finished examining all the local symbols to see which ones we are
10489 going to output. To deal with this, we keep the relocations in
10490 memory, and don't output them until the end of the link. This is
10491 an unfortunate waste of memory, but I don't see a good way around
10492 it. Fortunately, it only happens when performing a relocatable
10493 link, which is not the common case. FIXME: If keep_memory is set
10494 we could write the relocs out and then read them again; I don't
10495 know how bad the memory loss will be. */
10497 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10498 sub
->output_has_begun
= FALSE
;
10499 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10501 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10503 if (p
->type
== bfd_indirect_link_order
10504 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
10505 == bfd_target_elf_flavour
)
10506 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
10508 if (! sub
->output_has_begun
)
10510 if (! elf_link_input_bfd (&finfo
, sub
))
10512 sub
->output_has_begun
= TRUE
;
10515 else if (p
->type
== bfd_section_reloc_link_order
10516 || p
->type
== bfd_symbol_reloc_link_order
)
10518 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
10523 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
10529 /* Free symbol buffer if needed. */
10530 if (!info
->reduce_memory_overheads
)
10532 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10533 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10534 && elf_tdata (sub
)->symbuf
)
10536 free (elf_tdata (sub
)->symbuf
);
10537 elf_tdata (sub
)->symbuf
= NULL
;
10541 /* Output any global symbols that got converted to local in a
10542 version script or due to symbol visibility. We do this in a
10543 separate step since ELF requires all local symbols to appear
10544 prior to any global symbols. FIXME: We should only do this if
10545 some global symbols were, in fact, converted to become local.
10546 FIXME: Will this work correctly with the Irix 5 linker? */
10547 eoinfo
.failed
= FALSE
;
10548 eoinfo
.finfo
= &finfo
;
10549 eoinfo
.localsyms
= TRUE
;
10550 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10555 /* If backend needs to output some local symbols not present in the hash
10556 table, do it now. */
10557 if (bed
->elf_backend_output_arch_local_syms
)
10559 typedef int (*out_sym_func
)
10560 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10561 struct elf_link_hash_entry
*);
10563 if (! ((*bed
->elf_backend_output_arch_local_syms
)
10564 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10568 /* That wrote out all the local symbols. Finish up the symbol table
10569 with the global symbols. Even if we want to strip everything we
10570 can, we still need to deal with those global symbols that got
10571 converted to local in a version script. */
10573 /* The sh_info field records the index of the first non local symbol. */
10574 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
10577 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
10579 Elf_Internal_Sym sym
;
10580 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
10581 long last_local
= 0;
10583 /* Write out the section symbols for the output sections. */
10584 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
10590 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10593 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
10599 dynindx
= elf_section_data (s
)->dynindx
;
10602 indx
= elf_section_data (s
)->this_idx
;
10603 BFD_ASSERT (indx
> 0);
10604 sym
.st_shndx
= indx
;
10605 if (! check_dynsym (abfd
, &sym
))
10607 sym
.st_value
= s
->vma
;
10608 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
10609 if (last_local
< dynindx
)
10610 last_local
= dynindx
;
10611 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10615 /* Write out the local dynsyms. */
10616 if (elf_hash_table (info
)->dynlocal
)
10618 struct elf_link_local_dynamic_entry
*e
;
10619 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
10624 sym
.st_size
= e
->isym
.st_size
;
10625 sym
.st_other
= e
->isym
.st_other
;
10627 /* Copy the internal symbol as is.
10628 Note that we saved a word of storage and overwrote
10629 the original st_name with the dynstr_index. */
10632 s
= bfd_section_from_elf_index (e
->input_bfd
,
10637 elf_section_data (s
->output_section
)->this_idx
;
10638 if (! check_dynsym (abfd
, &sym
))
10640 sym
.st_value
= (s
->output_section
->vma
10642 + e
->isym
.st_value
);
10645 if (last_local
< e
->dynindx
)
10646 last_local
= e
->dynindx
;
10648 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
10649 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10653 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
10657 /* We get the global symbols from the hash table. */
10658 eoinfo
.failed
= FALSE
;
10659 eoinfo
.localsyms
= FALSE
;
10660 eoinfo
.finfo
= &finfo
;
10661 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10666 /* If backend needs to output some symbols not present in the hash
10667 table, do it now. */
10668 if (bed
->elf_backend_output_arch_syms
)
10670 typedef int (*out_sym_func
)
10671 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10672 struct elf_link_hash_entry
*);
10674 if (! ((*bed
->elf_backend_output_arch_syms
)
10675 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10679 /* Flush all symbols to the file. */
10680 if (! elf_link_flush_output_syms (&finfo
, bed
))
10683 /* Now we know the size of the symtab section. */
10684 off
+= symtab_hdr
->sh_size
;
10686 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
10687 if (symtab_shndx_hdr
->sh_name
!= 0)
10689 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
10690 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
10691 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
10692 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
10693 symtab_shndx_hdr
->sh_size
= amt
;
10695 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
10698 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
10699 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
10704 /* Finish up and write out the symbol string table (.strtab)
10706 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
10707 /* sh_name was set in prep_headers. */
10708 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
10709 symstrtab_hdr
->sh_flags
= 0;
10710 symstrtab_hdr
->sh_addr
= 0;
10711 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
10712 symstrtab_hdr
->sh_entsize
= 0;
10713 symstrtab_hdr
->sh_link
= 0;
10714 symstrtab_hdr
->sh_info
= 0;
10715 /* sh_offset is set just below. */
10716 symstrtab_hdr
->sh_addralign
= 1;
10718 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
10719 elf_tdata (abfd
)->next_file_pos
= off
;
10721 if (bfd_get_symcount (abfd
) > 0)
10723 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
10724 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
10728 /* Adjust the relocs to have the correct symbol indices. */
10729 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10731 if ((o
->flags
& SEC_RELOC
) == 0)
10734 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
10735 elf_section_data (o
)->rel_count
,
10736 elf_section_data (o
)->rel_hashes
);
10737 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
10738 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
10739 elf_section_data (o
)->rel_count2
,
10740 (elf_section_data (o
)->rel_hashes
10741 + elf_section_data (o
)->rel_count
));
10743 /* Set the reloc_count field to 0 to prevent write_relocs from
10744 trying to swap the relocs out itself. */
10745 o
->reloc_count
= 0;
10748 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
10749 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
10751 /* If we are linking against a dynamic object, or generating a
10752 shared library, finish up the dynamic linking information. */
10755 bfd_byte
*dyncon
, *dynconend
;
10757 /* Fix up .dynamic entries. */
10758 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10759 BFD_ASSERT (o
!= NULL
);
10761 dyncon
= o
->contents
;
10762 dynconend
= o
->contents
+ o
->size
;
10763 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10765 Elf_Internal_Dyn dyn
;
10769 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10776 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
10778 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
10780 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
10781 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
10784 dyn
.d_un
.d_val
= relativecount
;
10791 name
= info
->init_function
;
10794 name
= info
->fini_function
;
10797 struct elf_link_hash_entry
*h
;
10799 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
10800 FALSE
, FALSE
, TRUE
);
10802 && (h
->root
.type
== bfd_link_hash_defined
10803 || h
->root
.type
== bfd_link_hash_defweak
))
10805 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
10806 o
= h
->root
.u
.def
.section
;
10807 if (o
->output_section
!= NULL
)
10808 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
10809 + o
->output_offset
);
10812 /* The symbol is imported from another shared
10813 library and does not apply to this one. */
10814 dyn
.d_un
.d_ptr
= 0;
10821 case DT_PREINIT_ARRAYSZ
:
10822 name
= ".preinit_array";
10824 case DT_INIT_ARRAYSZ
:
10825 name
= ".init_array";
10827 case DT_FINI_ARRAYSZ
:
10828 name
= ".fini_array";
10830 o
= bfd_get_section_by_name (abfd
, name
);
10833 (*_bfd_error_handler
)
10834 (_("%B: could not find output section %s"), abfd
, name
);
10838 (*_bfd_error_handler
)
10839 (_("warning: %s section has zero size"), name
);
10840 dyn
.d_un
.d_val
= o
->size
;
10843 case DT_PREINIT_ARRAY
:
10844 name
= ".preinit_array";
10846 case DT_INIT_ARRAY
:
10847 name
= ".init_array";
10849 case DT_FINI_ARRAY
:
10850 name
= ".fini_array";
10857 name
= ".gnu.hash";
10866 name
= ".gnu.version_d";
10869 name
= ".gnu.version_r";
10872 name
= ".gnu.version";
10874 o
= bfd_get_section_by_name (abfd
, name
);
10877 (*_bfd_error_handler
)
10878 (_("%B: could not find output section %s"), abfd
, name
);
10881 dyn
.d_un
.d_ptr
= o
->vma
;
10888 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
10892 dyn
.d_un
.d_val
= 0;
10893 dyn
.d_un
.d_ptr
= 0;
10894 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10896 Elf_Internal_Shdr
*hdr
;
10898 hdr
= elf_elfsections (abfd
)[i
];
10899 if (hdr
->sh_type
== type
10900 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
10902 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
10903 dyn
.d_un
.d_val
+= hdr
->sh_size
;
10906 if (dyn
.d_un
.d_ptr
== 0
10907 || hdr
->sh_addr
< dyn
.d_un
.d_ptr
)
10908 dyn
.d_un
.d_ptr
= hdr
->sh_addr
;
10914 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
10918 /* If we have created any dynamic sections, then output them. */
10919 if (dynobj
!= NULL
)
10921 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
10924 /* Check for DT_TEXTREL (late, in case the backend removes it). */
10925 if (info
->warn_shared_textrel
&& info
->shared
)
10927 bfd_byte
*dyncon
, *dynconend
;
10929 /* Fix up .dynamic entries. */
10930 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10931 BFD_ASSERT (o
!= NULL
);
10933 dyncon
= o
->contents
;
10934 dynconend
= o
->contents
+ o
->size
;
10935 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10937 Elf_Internal_Dyn dyn
;
10939 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10941 if (dyn
.d_tag
== DT_TEXTREL
)
10943 info
->callbacks
->einfo
10944 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
10950 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
10952 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10954 || o
->output_section
== bfd_abs_section_ptr
)
10956 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
10958 /* At this point, we are only interested in sections
10959 created by _bfd_elf_link_create_dynamic_sections. */
10962 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
10964 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
10966 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
10968 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
10970 if (! bfd_set_section_contents (abfd
, o
->output_section
,
10972 (file_ptr
) o
->output_offset
,
10978 /* The contents of the .dynstr section are actually in a
10980 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
10981 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
10982 || ! _bfd_elf_strtab_emit (abfd
,
10983 elf_hash_table (info
)->dynstr
))
10989 if (info
->relocatable
)
10991 bfd_boolean failed
= FALSE
;
10993 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
10998 /* If we have optimized stabs strings, output them. */
10999 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
11001 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
11005 if (info
->eh_frame_hdr
)
11007 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
11011 if (finfo
.symstrtab
!= NULL
)
11012 _bfd_stringtab_free (finfo
.symstrtab
);
11013 if (finfo
.contents
!= NULL
)
11014 free (finfo
.contents
);
11015 if (finfo
.external_relocs
!= NULL
)
11016 free (finfo
.external_relocs
);
11017 if (finfo
.internal_relocs
!= NULL
)
11018 free (finfo
.internal_relocs
);
11019 if (finfo
.external_syms
!= NULL
)
11020 free (finfo
.external_syms
);
11021 if (finfo
.locsym_shndx
!= NULL
)
11022 free (finfo
.locsym_shndx
);
11023 if (finfo
.internal_syms
!= NULL
)
11024 free (finfo
.internal_syms
);
11025 if (finfo
.indices
!= NULL
)
11026 free (finfo
.indices
);
11027 if (finfo
.sections
!= NULL
)
11028 free (finfo
.sections
);
11029 if (finfo
.symbuf
!= NULL
)
11030 free (finfo
.symbuf
);
11031 if (finfo
.symshndxbuf
!= NULL
)
11032 free (finfo
.symshndxbuf
);
11033 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11035 if ((o
->flags
& SEC_RELOC
) != 0
11036 && elf_section_data (o
)->rel_hashes
!= NULL
)
11037 free (elf_section_data (o
)->rel_hashes
);
11040 elf_tdata (abfd
)->linker
= TRUE
;
11044 bfd_byte
*contents
= bfd_malloc (attr_size
);
11045 if (contents
== NULL
)
11046 return FALSE
; /* Bail out and fail. */
11047 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
11048 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
11055 if (finfo
.symstrtab
!= NULL
)
11056 _bfd_stringtab_free (finfo
.symstrtab
);
11057 if (finfo
.contents
!= NULL
)
11058 free (finfo
.contents
);
11059 if (finfo
.external_relocs
!= NULL
)
11060 free (finfo
.external_relocs
);
11061 if (finfo
.internal_relocs
!= NULL
)
11062 free (finfo
.internal_relocs
);
11063 if (finfo
.external_syms
!= NULL
)
11064 free (finfo
.external_syms
);
11065 if (finfo
.locsym_shndx
!= NULL
)
11066 free (finfo
.locsym_shndx
);
11067 if (finfo
.internal_syms
!= NULL
)
11068 free (finfo
.internal_syms
);
11069 if (finfo
.indices
!= NULL
)
11070 free (finfo
.indices
);
11071 if (finfo
.sections
!= NULL
)
11072 free (finfo
.sections
);
11073 if (finfo
.symbuf
!= NULL
)
11074 free (finfo
.symbuf
);
11075 if (finfo
.symshndxbuf
!= NULL
)
11076 free (finfo
.symshndxbuf
);
11077 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11079 if ((o
->flags
& SEC_RELOC
) != 0
11080 && elf_section_data (o
)->rel_hashes
!= NULL
)
11081 free (elf_section_data (o
)->rel_hashes
);
11087 /* Initialize COOKIE for input bfd ABFD. */
11090 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
11091 struct bfd_link_info
*info
, bfd
*abfd
)
11093 Elf_Internal_Shdr
*symtab_hdr
;
11094 const struct elf_backend_data
*bed
;
11096 bed
= get_elf_backend_data (abfd
);
11097 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11099 cookie
->abfd
= abfd
;
11100 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
11101 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
11102 if (cookie
->bad_symtab
)
11104 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11105 cookie
->extsymoff
= 0;
11109 cookie
->locsymcount
= symtab_hdr
->sh_info
;
11110 cookie
->extsymoff
= symtab_hdr
->sh_info
;
11113 if (bed
->s
->arch_size
== 32)
11114 cookie
->r_sym_shift
= 8;
11116 cookie
->r_sym_shift
= 32;
11118 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11119 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
11121 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
11122 cookie
->locsymcount
, 0,
11124 if (cookie
->locsyms
== NULL
)
11126 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
11129 if (info
->keep_memory
)
11130 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
11135 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11138 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
11140 Elf_Internal_Shdr
*symtab_hdr
;
11142 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11143 if (cookie
->locsyms
!= NULL
11144 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
11145 free (cookie
->locsyms
);
11148 /* Initialize the relocation information in COOKIE for input section SEC
11149 of input bfd ABFD. */
11152 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11153 struct bfd_link_info
*info
, bfd
*abfd
,
11156 const struct elf_backend_data
*bed
;
11158 if (sec
->reloc_count
== 0)
11160 cookie
->rels
= NULL
;
11161 cookie
->relend
= NULL
;
11165 bed
= get_elf_backend_data (abfd
);
11167 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
11168 info
->keep_memory
);
11169 if (cookie
->rels
== NULL
)
11171 cookie
->rel
= cookie
->rels
;
11172 cookie
->relend
= (cookie
->rels
11173 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
11175 cookie
->rel
= cookie
->rels
;
11179 /* Free the memory allocated by init_reloc_cookie_rels,
11183 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11186 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
11187 free (cookie
->rels
);
11190 /* Initialize the whole of COOKIE for input section SEC. */
11193 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11194 struct bfd_link_info
*info
,
11197 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
11199 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
11204 fini_reloc_cookie (cookie
, sec
->owner
);
11209 /* Free the memory allocated by init_reloc_cookie_for_section,
11213 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11216 fini_reloc_cookie_rels (cookie
, sec
);
11217 fini_reloc_cookie (cookie
, sec
->owner
);
11220 /* Garbage collect unused sections. */
11222 /* Default gc_mark_hook. */
11225 _bfd_elf_gc_mark_hook (asection
*sec
,
11226 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
11227 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
11228 struct elf_link_hash_entry
*h
,
11229 Elf_Internal_Sym
*sym
)
11233 switch (h
->root
.type
)
11235 case bfd_link_hash_defined
:
11236 case bfd_link_hash_defweak
:
11237 return h
->root
.u
.def
.section
;
11239 case bfd_link_hash_common
:
11240 return h
->root
.u
.c
.p
->section
;
11247 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
11252 /* COOKIE->rel describes a relocation against section SEC, which is
11253 a section we've decided to keep. Return the section that contains
11254 the relocation symbol, or NULL if no section contains it. */
11257 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
11258 elf_gc_mark_hook_fn gc_mark_hook
,
11259 struct elf_reloc_cookie
*cookie
)
11261 unsigned long r_symndx
;
11262 struct elf_link_hash_entry
*h
;
11264 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
11268 if (r_symndx
>= cookie
->locsymcount
11269 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11271 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
11272 while (h
->root
.type
== bfd_link_hash_indirect
11273 || h
->root
.type
== bfd_link_hash_warning
)
11274 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11275 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
11278 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
11279 &cookie
->locsyms
[r_symndx
]);
11282 /* COOKIE->rel describes a relocation against section SEC, which is
11283 a section we've decided to keep. Mark the section that contains
11284 the relocation symbol. */
11287 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
11289 elf_gc_mark_hook_fn gc_mark_hook
,
11290 struct elf_reloc_cookie
*cookie
)
11294 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
);
11295 if (rsec
&& !rsec
->gc_mark
)
11297 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
11299 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
11305 /* The mark phase of garbage collection. For a given section, mark
11306 it and any sections in this section's group, and all the sections
11307 which define symbols to which it refers. */
11310 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
11312 elf_gc_mark_hook_fn gc_mark_hook
)
11315 asection
*group_sec
, *eh_frame
;
11319 /* Mark all the sections in the group. */
11320 group_sec
= elf_section_data (sec
)->next_in_group
;
11321 if (group_sec
&& !group_sec
->gc_mark
)
11322 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
11325 /* Look through the section relocs. */
11327 eh_frame
= elf_eh_frame_section (sec
->owner
);
11328 if ((sec
->flags
& SEC_RELOC
) != 0
11329 && sec
->reloc_count
> 0
11330 && sec
!= eh_frame
)
11332 struct elf_reloc_cookie cookie
;
11334 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
11338 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
11339 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
11344 fini_reloc_cookie_for_section (&cookie
, sec
);
11348 if (ret
&& eh_frame
&& elf_fde_list (sec
))
11350 struct elf_reloc_cookie cookie
;
11352 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
11356 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
11357 gc_mark_hook
, &cookie
))
11359 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
11366 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11368 struct elf_gc_sweep_symbol_info
11370 struct bfd_link_info
*info
;
11371 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
11376 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
11378 if (h
->root
.type
== bfd_link_hash_warning
)
11379 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11381 if ((h
->root
.type
== bfd_link_hash_defined
11382 || h
->root
.type
== bfd_link_hash_defweak
)
11383 && !h
->root
.u
.def
.section
->gc_mark
11384 && !(h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
))
11386 struct elf_gc_sweep_symbol_info
*inf
= data
;
11387 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
11393 /* The sweep phase of garbage collection. Remove all garbage sections. */
11395 typedef bfd_boolean (*gc_sweep_hook_fn
)
11396 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
11399 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
11402 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11403 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
11404 unsigned long section_sym_count
;
11405 struct elf_gc_sweep_symbol_info sweep_info
;
11407 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11411 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11414 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11416 /* When any section in a section group is kept, we keep all
11417 sections in the section group. If the first member of
11418 the section group is excluded, we will also exclude the
11420 if (o
->flags
& SEC_GROUP
)
11422 asection
*first
= elf_next_in_group (o
);
11423 o
->gc_mark
= first
->gc_mark
;
11425 else if ((o
->flags
& (SEC_DEBUGGING
| SEC_LINKER_CREATED
)) != 0
11426 || (o
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
11428 /* Keep debug and special sections. */
11435 /* Skip sweeping sections already excluded. */
11436 if (o
->flags
& SEC_EXCLUDE
)
11439 /* Since this is early in the link process, it is simple
11440 to remove a section from the output. */
11441 o
->flags
|= SEC_EXCLUDE
;
11443 if (info
->print_gc_sections
&& o
->size
!= 0)
11444 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
11446 /* But we also have to update some of the relocation
11447 info we collected before. */
11449 && (o
->flags
& SEC_RELOC
) != 0
11450 && o
->reloc_count
> 0
11451 && !bfd_is_abs_section (o
->output_section
))
11453 Elf_Internal_Rela
*internal_relocs
;
11457 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
11458 info
->keep_memory
);
11459 if (internal_relocs
== NULL
)
11462 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
11464 if (elf_section_data (o
)->relocs
!= internal_relocs
)
11465 free (internal_relocs
);
11473 /* Remove the symbols that were in the swept sections from the dynamic
11474 symbol table. GCFIXME: Anyone know how to get them out of the
11475 static symbol table as well? */
11476 sweep_info
.info
= info
;
11477 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
11478 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
11481 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
11485 /* Propagate collected vtable information. This is called through
11486 elf_link_hash_traverse. */
11489 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
11491 if (h
->root
.type
== bfd_link_hash_warning
)
11492 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11494 /* Those that are not vtables. */
11495 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11498 /* Those vtables that do not have parents, we cannot merge. */
11499 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
11502 /* If we've already been done, exit. */
11503 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
11506 /* Make sure the parent's table is up to date. */
11507 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
11509 if (h
->vtable
->used
== NULL
)
11511 /* None of this table's entries were referenced. Re-use the
11513 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
11514 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
11519 bfd_boolean
*cu
, *pu
;
11521 /* Or the parent's entries into ours. */
11522 cu
= h
->vtable
->used
;
11524 pu
= h
->vtable
->parent
->vtable
->used
;
11527 const struct elf_backend_data
*bed
;
11528 unsigned int log_file_align
;
11530 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
11531 log_file_align
= bed
->s
->log_file_align
;
11532 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
11547 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
11550 bfd_vma hstart
, hend
;
11551 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
11552 const struct elf_backend_data
*bed
;
11553 unsigned int log_file_align
;
11555 if (h
->root
.type
== bfd_link_hash_warning
)
11556 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11558 /* Take care of both those symbols that do not describe vtables as
11559 well as those that are not loaded. */
11560 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11563 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
11564 || h
->root
.type
== bfd_link_hash_defweak
);
11566 sec
= h
->root
.u
.def
.section
;
11567 hstart
= h
->root
.u
.def
.value
;
11568 hend
= hstart
+ h
->size
;
11570 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
11572 return *(bfd_boolean
*) okp
= FALSE
;
11573 bed
= get_elf_backend_data (sec
->owner
);
11574 log_file_align
= bed
->s
->log_file_align
;
11576 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
11578 for (rel
= relstart
; rel
< relend
; ++rel
)
11579 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
11581 /* If the entry is in use, do nothing. */
11582 if (h
->vtable
->used
11583 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
11585 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
11586 if (h
->vtable
->used
[entry
])
11589 /* Otherwise, kill it. */
11590 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
11596 /* Mark sections containing dynamically referenced symbols. When
11597 building shared libraries, we must assume that any visible symbol is
11601 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
11603 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
11605 if (h
->root
.type
== bfd_link_hash_warning
)
11606 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11608 if ((h
->root
.type
== bfd_link_hash_defined
11609 || h
->root
.type
== bfd_link_hash_defweak
)
11611 || (!info
->executable
11613 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
11614 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
)))
11615 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11620 /* Keep all sections containing symbols undefined on the command-line,
11621 and the section containing the entry symbol. */
11624 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
11626 struct bfd_sym_chain
*sym
;
11628 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
11630 struct elf_link_hash_entry
*h
;
11632 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
11633 FALSE
, FALSE
, FALSE
);
11636 && (h
->root
.type
== bfd_link_hash_defined
11637 || h
->root
.type
== bfd_link_hash_defweak
)
11638 && !bfd_is_abs_section (h
->root
.u
.def
.section
))
11639 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11643 /* Do mark and sweep of unused sections. */
11646 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
11648 bfd_boolean ok
= TRUE
;
11650 elf_gc_mark_hook_fn gc_mark_hook
;
11651 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11653 if (!bed
->can_gc_sections
11654 || !is_elf_hash_table (info
->hash
))
11656 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
11660 bed
->gc_keep (info
);
11662 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11663 at the .eh_frame section if we can mark the FDEs individually. */
11664 _bfd_elf_begin_eh_frame_parsing (info
);
11665 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11668 struct elf_reloc_cookie cookie
;
11670 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
11671 if (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
11673 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
11674 if (elf_section_data (sec
)->sec_info
)
11675 elf_eh_frame_section (sub
) = sec
;
11676 fini_reloc_cookie_for_section (&cookie
, sec
);
11679 _bfd_elf_end_eh_frame_parsing (info
);
11681 /* Apply transitive closure to the vtable entry usage info. */
11682 elf_link_hash_traverse (elf_hash_table (info
),
11683 elf_gc_propagate_vtable_entries_used
,
11688 /* Kill the vtable relocations that were not used. */
11689 elf_link_hash_traverse (elf_hash_table (info
),
11690 elf_gc_smash_unused_vtentry_relocs
,
11695 /* Mark dynamically referenced symbols. */
11696 if (elf_hash_table (info
)->dynamic_sections_created
)
11697 elf_link_hash_traverse (elf_hash_table (info
),
11698 bed
->gc_mark_dynamic_ref
,
11701 /* Grovel through relocs to find out who stays ... */
11702 gc_mark_hook
= bed
->gc_mark_hook
;
11703 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11707 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11710 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11711 if ((o
->flags
& (SEC_EXCLUDE
| SEC_KEEP
)) == SEC_KEEP
&& !o
->gc_mark
)
11712 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
11716 /* Allow the backend to mark additional target specific sections. */
11717 if (bed
->gc_mark_extra_sections
)
11718 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
11720 /* ... and mark SEC_EXCLUDE for those that go. */
11721 return elf_gc_sweep (abfd
, info
);
11724 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11727 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
11729 struct elf_link_hash_entry
*h
,
11732 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
11733 struct elf_link_hash_entry
**search
, *child
;
11734 bfd_size_type extsymcount
;
11735 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11737 /* The sh_info field of the symtab header tells us where the
11738 external symbols start. We don't care about the local symbols at
11740 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
11741 if (!elf_bad_symtab (abfd
))
11742 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
11744 sym_hashes
= elf_sym_hashes (abfd
);
11745 sym_hashes_end
= sym_hashes
+ extsymcount
;
11747 /* Hunt down the child symbol, which is in this section at the same
11748 offset as the relocation. */
11749 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
11751 if ((child
= *search
) != NULL
11752 && (child
->root
.type
== bfd_link_hash_defined
11753 || child
->root
.type
== bfd_link_hash_defweak
)
11754 && child
->root
.u
.def
.section
== sec
11755 && child
->root
.u
.def
.value
== offset
)
11759 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
11760 abfd
, sec
, (unsigned long) offset
);
11761 bfd_set_error (bfd_error_invalid_operation
);
11765 if (!child
->vtable
)
11767 child
->vtable
= bfd_zalloc (abfd
, sizeof (*child
->vtable
));
11768 if (!child
->vtable
)
11773 /* This *should* only be the absolute section. It could potentially
11774 be that someone has defined a non-global vtable though, which
11775 would be bad. It isn't worth paging in the local symbols to be
11776 sure though; that case should simply be handled by the assembler. */
11778 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
11781 child
->vtable
->parent
= h
;
11786 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
11789 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
11790 asection
*sec ATTRIBUTE_UNUSED
,
11791 struct elf_link_hash_entry
*h
,
11794 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11795 unsigned int log_file_align
= bed
->s
->log_file_align
;
11799 h
->vtable
= bfd_zalloc (abfd
, sizeof (*h
->vtable
));
11804 if (addend
>= h
->vtable
->size
)
11806 size_t size
, bytes
, file_align
;
11807 bfd_boolean
*ptr
= h
->vtable
->used
;
11809 /* While the symbol is undefined, we have to be prepared to handle
11811 file_align
= 1 << log_file_align
;
11812 if (h
->root
.type
== bfd_link_hash_undefined
)
11813 size
= addend
+ file_align
;
11817 if (addend
>= size
)
11819 /* Oops! We've got a reference past the defined end of
11820 the table. This is probably a bug -- shall we warn? */
11821 size
= addend
+ file_align
;
11824 size
= (size
+ file_align
- 1) & -file_align
;
11826 /* Allocate one extra entry for use as a "done" flag for the
11827 consolidation pass. */
11828 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
11832 ptr
= bfd_realloc (ptr
- 1, bytes
);
11838 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
11839 * sizeof (bfd_boolean
));
11840 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
11844 ptr
= bfd_zmalloc (bytes
);
11849 /* And arrange for that done flag to be at index -1. */
11850 h
->vtable
->used
= ptr
+ 1;
11851 h
->vtable
->size
= size
;
11854 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
11859 struct alloc_got_off_arg
{
11861 struct bfd_link_info
*info
;
11864 /* We need a special top-level link routine to convert got reference counts
11865 to real got offsets. */
11868 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
11870 struct alloc_got_off_arg
*gofarg
= arg
;
11871 bfd
*obfd
= gofarg
->info
->output_bfd
;
11872 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
11874 if (h
->root
.type
== bfd_link_hash_warning
)
11875 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11877 if (h
->got
.refcount
> 0)
11879 h
->got
.offset
= gofarg
->gotoff
;
11880 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
11883 h
->got
.offset
= (bfd_vma
) -1;
11888 /* And an accompanying bit to work out final got entry offsets once
11889 we're done. Should be called from final_link. */
11892 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
11893 struct bfd_link_info
*info
)
11896 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11898 struct alloc_got_off_arg gofarg
;
11900 BFD_ASSERT (abfd
== info
->output_bfd
);
11902 if (! is_elf_hash_table (info
->hash
))
11905 /* The GOT offset is relative to the .got section, but the GOT header is
11906 put into the .got.plt section, if the backend uses it. */
11907 if (bed
->want_got_plt
)
11910 gotoff
= bed
->got_header_size
;
11912 /* Do the local .got entries first. */
11913 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
11915 bfd_signed_vma
*local_got
;
11916 bfd_size_type j
, locsymcount
;
11917 Elf_Internal_Shdr
*symtab_hdr
;
11919 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
11922 local_got
= elf_local_got_refcounts (i
);
11926 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
11927 if (elf_bad_symtab (i
))
11928 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11930 locsymcount
= symtab_hdr
->sh_info
;
11932 for (j
= 0; j
< locsymcount
; ++j
)
11934 if (local_got
[j
] > 0)
11936 local_got
[j
] = gotoff
;
11937 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
11940 local_got
[j
] = (bfd_vma
) -1;
11944 /* Then the global .got entries. .plt refcounts are handled by
11945 adjust_dynamic_symbol */
11946 gofarg
.gotoff
= gotoff
;
11947 gofarg
.info
= info
;
11948 elf_link_hash_traverse (elf_hash_table (info
),
11949 elf_gc_allocate_got_offsets
,
11954 /* Many folk need no more in the way of final link than this, once
11955 got entry reference counting is enabled. */
11958 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
11960 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
11963 /* Invoke the regular ELF backend linker to do all the work. */
11964 return bfd_elf_final_link (abfd
, info
);
11968 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
11970 struct elf_reloc_cookie
*rcookie
= cookie
;
11972 if (rcookie
->bad_symtab
)
11973 rcookie
->rel
= rcookie
->rels
;
11975 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
11977 unsigned long r_symndx
;
11979 if (! rcookie
->bad_symtab
)
11980 if (rcookie
->rel
->r_offset
> offset
)
11982 if (rcookie
->rel
->r_offset
!= offset
)
11985 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
11986 if (r_symndx
== SHN_UNDEF
)
11989 if (r_symndx
>= rcookie
->locsymcount
11990 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11992 struct elf_link_hash_entry
*h
;
11994 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
11996 while (h
->root
.type
== bfd_link_hash_indirect
11997 || h
->root
.type
== bfd_link_hash_warning
)
11998 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12000 if ((h
->root
.type
== bfd_link_hash_defined
12001 || h
->root
.type
== bfd_link_hash_defweak
)
12002 && elf_discarded_section (h
->root
.u
.def
.section
))
12009 /* It's not a relocation against a global symbol,
12010 but it could be a relocation against a local
12011 symbol for a discarded section. */
12013 Elf_Internal_Sym
*isym
;
12015 /* Need to: get the symbol; get the section. */
12016 isym
= &rcookie
->locsyms
[r_symndx
];
12017 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
12018 if (isec
!= NULL
&& elf_discarded_section (isec
))
12026 /* Discard unneeded references to discarded sections.
12027 Returns TRUE if any section's size was changed. */
12028 /* This function assumes that the relocations are in sorted order,
12029 which is true for all known assemblers. */
12032 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
12034 struct elf_reloc_cookie cookie
;
12035 asection
*stab
, *eh
;
12036 const struct elf_backend_data
*bed
;
12038 bfd_boolean ret
= FALSE
;
12040 if (info
->traditional_format
12041 || !is_elf_hash_table (info
->hash
))
12044 _bfd_elf_begin_eh_frame_parsing (info
);
12045 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
12047 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
12050 bed
= get_elf_backend_data (abfd
);
12052 if ((abfd
->flags
& DYNAMIC
) != 0)
12056 if (!info
->relocatable
)
12058 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
12061 || bfd_is_abs_section (eh
->output_section
)))
12065 stab
= bfd_get_section_by_name (abfd
, ".stab");
12067 && (stab
->size
== 0
12068 || bfd_is_abs_section (stab
->output_section
)
12069 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
12074 && bed
->elf_backend_discard_info
== NULL
)
12077 if (!init_reloc_cookie (&cookie
, info
, abfd
))
12081 && stab
->reloc_count
> 0
12082 && init_reloc_cookie_rels (&cookie
, info
, abfd
, stab
))
12084 if (_bfd_discard_section_stabs (abfd
, stab
,
12085 elf_section_data (stab
)->sec_info
,
12086 bfd_elf_reloc_symbol_deleted_p
,
12089 fini_reloc_cookie_rels (&cookie
, stab
);
12093 && init_reloc_cookie_rels (&cookie
, info
, abfd
, eh
))
12095 _bfd_elf_parse_eh_frame (abfd
, info
, eh
, &cookie
);
12096 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
12097 bfd_elf_reloc_symbol_deleted_p
,
12100 fini_reloc_cookie_rels (&cookie
, eh
);
12103 if (bed
->elf_backend_discard_info
!= NULL
12104 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
12107 fini_reloc_cookie (&cookie
, abfd
);
12109 _bfd_elf_end_eh_frame_parsing (info
);
12111 if (info
->eh_frame_hdr
12112 && !info
->relocatable
12113 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
12119 /* For a SHT_GROUP section, return the group signature. For other
12120 sections, return the normal section name. */
12122 static const char *
12123 section_signature (asection
*sec
)
12125 if ((sec
->flags
& SEC_GROUP
) != 0
12126 && elf_next_in_group (sec
) != NULL
12127 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
12128 return elf_group_name (elf_next_in_group (sec
));
12133 _bfd_elf_section_already_linked (bfd
*abfd
, asection
*sec
,
12134 struct bfd_link_info
*info
)
12137 const char *name
, *p
;
12138 struct bfd_section_already_linked
*l
;
12139 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
12141 if (sec
->output_section
== bfd_abs_section_ptr
)
12144 flags
= sec
->flags
;
12146 /* Return if it isn't a linkonce section. A comdat group section
12147 also has SEC_LINK_ONCE set. */
12148 if ((flags
& SEC_LINK_ONCE
) == 0)
12151 /* Don't put group member sections on our list of already linked
12152 sections. They are handled as a group via their group section. */
12153 if (elf_sec_group (sec
) != NULL
)
12156 /* FIXME: When doing a relocatable link, we may have trouble
12157 copying relocations in other sections that refer to local symbols
12158 in the section being discarded. Those relocations will have to
12159 be converted somehow; as of this writing I'm not sure that any of
12160 the backends handle that correctly.
12162 It is tempting to instead not discard link once sections when
12163 doing a relocatable link (technically, they should be discarded
12164 whenever we are building constructors). However, that fails,
12165 because the linker winds up combining all the link once sections
12166 into a single large link once section, which defeats the purpose
12167 of having link once sections in the first place.
12169 Also, not merging link once sections in a relocatable link
12170 causes trouble for MIPS ELF, which relies on link once semantics
12171 to handle the .reginfo section correctly. */
12173 name
= section_signature (sec
);
12175 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
12176 && (p
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
12181 already_linked_list
= bfd_section_already_linked_table_lookup (p
);
12183 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12185 /* We may have 2 different types of sections on the list: group
12186 sections and linkonce sections. Match like sections. */
12187 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
12188 && strcmp (name
, section_signature (l
->sec
)) == 0
12189 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
12191 /* The section has already been linked. See if we should
12192 issue a warning. */
12193 switch (flags
& SEC_LINK_DUPLICATES
)
12198 case SEC_LINK_DUPLICATES_DISCARD
:
12201 case SEC_LINK_DUPLICATES_ONE_ONLY
:
12202 (*_bfd_error_handler
)
12203 (_("%B: ignoring duplicate section `%A'"),
12207 case SEC_LINK_DUPLICATES_SAME_SIZE
:
12208 if (sec
->size
!= l
->sec
->size
)
12209 (*_bfd_error_handler
)
12210 (_("%B: duplicate section `%A' has different size"),
12214 case SEC_LINK_DUPLICATES_SAME_CONTENTS
:
12215 if (sec
->size
!= l
->sec
->size
)
12216 (*_bfd_error_handler
)
12217 (_("%B: duplicate section `%A' has different size"),
12219 else if (sec
->size
!= 0)
12221 bfd_byte
*sec_contents
, *l_sec_contents
;
12223 if (!bfd_malloc_and_get_section (abfd
, sec
, &sec_contents
))
12224 (*_bfd_error_handler
)
12225 (_("%B: warning: could not read contents of section `%A'"),
12227 else if (!bfd_malloc_and_get_section (l
->sec
->owner
, l
->sec
,
12229 (*_bfd_error_handler
)
12230 (_("%B: warning: could not read contents of section `%A'"),
12231 l
->sec
->owner
, l
->sec
);
12232 else if (memcmp (sec_contents
, l_sec_contents
, sec
->size
) != 0)
12233 (*_bfd_error_handler
)
12234 (_("%B: warning: duplicate section `%A' has different contents"),
12238 free (sec_contents
);
12239 if (l_sec_contents
)
12240 free (l_sec_contents
);
12245 /* Set the output_section field so that lang_add_section
12246 does not create a lang_input_section structure for this
12247 section. Since there might be a symbol in the section
12248 being discarded, we must retain a pointer to the section
12249 which we are really going to use. */
12250 sec
->output_section
= bfd_abs_section_ptr
;
12251 sec
->kept_section
= l
->sec
;
12253 if (flags
& SEC_GROUP
)
12255 asection
*first
= elf_next_in_group (sec
);
12256 asection
*s
= first
;
12260 s
->output_section
= bfd_abs_section_ptr
;
12261 /* Record which group discards it. */
12262 s
->kept_section
= l
->sec
;
12263 s
= elf_next_in_group (s
);
12264 /* These lists are circular. */
12274 /* A single member comdat group section may be discarded by a
12275 linkonce section and vice versa. */
12277 if ((flags
& SEC_GROUP
) != 0)
12279 asection
*first
= elf_next_in_group (sec
);
12281 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
12282 /* Check this single member group against linkonce sections. */
12283 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12284 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12285 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
12286 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
12288 first
->output_section
= bfd_abs_section_ptr
;
12289 first
->kept_section
= l
->sec
;
12290 sec
->output_section
= bfd_abs_section_ptr
;
12295 /* Check this linkonce section against single member groups. */
12296 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12297 if (l
->sec
->flags
& SEC_GROUP
)
12299 asection
*first
= elf_next_in_group (l
->sec
);
12302 && elf_next_in_group (first
) == first
12303 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
12305 sec
->output_section
= bfd_abs_section_ptr
;
12306 sec
->kept_section
= first
;
12311 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12312 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12313 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12314 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12315 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12316 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12317 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12318 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12319 The reverse order cannot happen as there is never a bfd with only the
12320 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12321 matter as here were are looking only for cross-bfd sections. */
12323 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
12324 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12325 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12326 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
12328 if (abfd
!= l
->sec
->owner
)
12329 sec
->output_section
= bfd_abs_section_ptr
;
12333 /* This is the first section with this name. Record it. */
12334 if (! bfd_section_already_linked_table_insert (already_linked_list
, sec
))
12335 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
12339 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
12341 return sym
->st_shndx
== SHN_COMMON
;
12345 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
12351 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
12353 return bfd_com_section_ptr
;
12357 _bfd_elf_default_got_elt_size (bfd
*abfd
,
12358 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
12359 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
12360 bfd
*ibfd ATTRIBUTE_UNUSED
,
12361 unsigned long symndx ATTRIBUTE_UNUSED
)
12363 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12364 return bed
->s
->arch_size
/ 8;
12367 /* Routines to support the creation of dynamic relocs. */
12369 /* Return true if NAME is a name of a relocation
12370 section associated with section S. */
12373 is_reloc_section (bfd_boolean rela
, const char * name
, asection
* s
)
12376 return CONST_STRNEQ (name
, ".rela")
12377 && strcmp (bfd_get_section_name (NULL
, s
), name
+ 5) == 0;
12379 return CONST_STRNEQ (name
, ".rel")
12380 && strcmp (bfd_get_section_name (NULL
, s
), name
+ 4) == 0;
12383 /* Returns the name of the dynamic reloc section associated with SEC. */
12385 static const char *
12386 get_dynamic_reloc_section_name (bfd
* abfd
,
12388 bfd_boolean is_rela
)
12391 unsigned int strndx
= elf_elfheader (abfd
)->e_shstrndx
;
12392 unsigned int shnam
= elf_section_data (sec
)->rel_hdr
.sh_name
;
12394 name
= bfd_elf_string_from_elf_section (abfd
, strndx
, shnam
);
12398 if (! is_reloc_section (is_rela
, name
, sec
))
12400 static bfd_boolean complained
= FALSE
;
12404 (*_bfd_error_handler
)
12405 (_("%B: bad relocation section name `%s\'"), abfd
, name
);
12414 /* Returns the dynamic reloc section associated with SEC.
12415 If necessary compute the name of the dynamic reloc section based
12416 on SEC's name (looked up in ABFD's string table) and the setting
12420 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
12422 bfd_boolean is_rela
)
12424 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12426 if (reloc_sec
== NULL
)
12428 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12432 reloc_sec
= bfd_get_section_by_name (abfd
, name
);
12434 if (reloc_sec
!= NULL
)
12435 elf_section_data (sec
)->sreloc
= reloc_sec
;
12442 /* Returns the dynamic reloc section associated with SEC. If the
12443 section does not exist it is created and attached to the DYNOBJ
12444 bfd and stored in the SRELOC field of SEC's elf_section_data
12447 ALIGNMENT is the alignment for the newly created section and
12448 IS_RELA defines whether the name should be .rela.<SEC's name>
12449 or .rel.<SEC's name>. The section name is looked up in the
12450 string table associated with ABFD. */
12453 _bfd_elf_make_dynamic_reloc_section (asection
* sec
,
12455 unsigned int alignment
,
12457 bfd_boolean is_rela
)
12459 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12461 if (reloc_sec
== NULL
)
12463 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12468 reloc_sec
= bfd_get_section_by_name (dynobj
, name
);
12470 if (reloc_sec
== NULL
)
12474 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
12475 if ((sec
->flags
& SEC_ALLOC
) != 0)
12476 flags
|= SEC_ALLOC
| SEC_LOAD
;
12478 reloc_sec
= bfd_make_section_with_flags (dynobj
, name
, flags
);
12479 if (reloc_sec
!= NULL
)
12481 if (! bfd_set_section_alignment (dynobj
, reloc_sec
, alignment
))
12486 elf_section_data (sec
)->sreloc
= reloc_sec
;
12492 /* Returns the name of the ifunc using dynamic reloc section associated with SEC. */
12493 #define IFUNC_INFIX ".ifunc"
12495 static const char *
12496 get_ifunc_reloc_section_name (bfd
* abfd
,
12501 const char * base_name
;
12502 unsigned int strndx
= elf_elfheader (abfd
)->e_shstrndx
;
12503 unsigned int shnam
= elf_section_data (sec
)->rel_hdr
.sh_name
;
12505 base_name
= bfd_elf_string_from_elf_section (abfd
, strndx
, shnam
);
12506 if (base_name
== NULL
)
12509 dot
= strchr (base_name
+ 1, '.');
12510 name
= bfd_alloc (abfd
, strlen (base_name
) + strlen (IFUNC_INFIX
) + 1);
12511 sprintf (name
, "%.*s%s%s", (int)(dot
- base_name
), base_name
, IFUNC_INFIX
, dot
);
12516 /* Like _bfd_elf_make_dynamic_reloc_section but it creates a
12517 section for holding relocs against symbols with the STT_GNU_IFUNC
12518 type. The section is attached to the OWNER bfd but it is created
12519 with a name based on SEC from ABFD. */
12522 _bfd_elf_make_ifunc_reloc_section (bfd
* abfd
,
12525 unsigned int align
)
12527 asection
* reloc_sec
= elf_section_data (sec
)->indirect_relocs
;
12529 if (reloc_sec
== NULL
)
12531 const char * name
= get_ifunc_reloc_section_name (abfd
, sec
);
12536 reloc_sec
= bfd_get_section_by_name (owner
, name
);
12538 if (reloc_sec
== NULL
)
12542 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
12543 if ((sec
->flags
& SEC_ALLOC
) != 0)
12544 flags
|= SEC_ALLOC
| SEC_LOAD
;
12546 reloc_sec
= bfd_make_section_with_flags (owner
, name
, flags
);
12548 if (reloc_sec
!= NULL
12549 && ! bfd_set_section_alignment (owner
, reloc_sec
, align
))
12553 elf_section_data (sec
)->indirect_relocs
= reloc_sec
;