1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010
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
);
104 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
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 flags
= bed
->dynamic_sec_flags
;
113 s
= bfd_make_section_with_flags (abfd
,
114 (bed
->rela_plts_and_copies_p
115 ? ".rela.got" : ".rel.got"),
116 (bed
->dynamic_sec_flags
119 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
123 s
= bfd_make_section_with_flags (abfd
, ".got", flags
);
125 || !bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
129 if (bed
->want_got_plt
)
131 s
= bfd_make_section_with_flags (abfd
, ".got.plt", flags
);
133 || !bfd_set_section_alignment (abfd
, s
,
134 bed
->s
->log_file_align
))
139 /* The first bit of the global offset table is the header. */
140 s
->size
+= bed
->got_header_size
;
142 if (bed
->want_got_sym
)
144 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
145 (or .got.plt) section. We don't do this in the linker script
146 because we don't want to define the symbol if we are not creating
147 a global offset table. */
148 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
149 "_GLOBAL_OFFSET_TABLE_");
150 elf_hash_table (info
)->hgot
= h
;
158 /* Create a strtab to hold the dynamic symbol names. */
160 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
162 struct elf_link_hash_table
*hash_table
;
164 hash_table
= elf_hash_table (info
);
165 if (hash_table
->dynobj
== NULL
)
166 hash_table
->dynobj
= abfd
;
168 if (hash_table
->dynstr
== NULL
)
170 hash_table
->dynstr
= _bfd_elf_strtab_init ();
171 if (hash_table
->dynstr
== NULL
)
177 /* Create some sections which will be filled in with dynamic linking
178 information. ABFD is an input file which requires dynamic sections
179 to be created. The dynamic sections take up virtual memory space
180 when the final executable is run, so we need to create them before
181 addresses are assigned to the output sections. We work out the
182 actual contents and size of these sections later. */
185 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
189 const struct elf_backend_data
*bed
;
191 if (! is_elf_hash_table (info
->hash
))
194 if (elf_hash_table (info
)->dynamic_sections_created
)
197 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
200 abfd
= elf_hash_table (info
)->dynobj
;
201 bed
= get_elf_backend_data (abfd
);
203 flags
= bed
->dynamic_sec_flags
;
205 /* A dynamically linked executable has a .interp section, but a
206 shared library does not. */
207 if (info
->executable
)
209 s
= bfd_make_section_with_flags (abfd
, ".interp",
210 flags
| SEC_READONLY
);
215 /* Create sections to hold version informations. These are removed
216 if they are not needed. */
217 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_d",
218 flags
| SEC_READONLY
);
220 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
223 s
= bfd_make_section_with_flags (abfd
, ".gnu.version",
224 flags
| SEC_READONLY
);
226 || ! bfd_set_section_alignment (abfd
, s
, 1))
229 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_r",
230 flags
| SEC_READONLY
);
232 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
235 s
= bfd_make_section_with_flags (abfd
, ".dynsym",
236 flags
| SEC_READONLY
);
238 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
241 s
= bfd_make_section_with_flags (abfd
, ".dynstr",
242 flags
| SEC_READONLY
);
246 s
= bfd_make_section_with_flags (abfd
, ".dynamic", flags
);
248 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
251 /* The special symbol _DYNAMIC is always set to the start of the
252 .dynamic section. We could set _DYNAMIC in a linker script, but we
253 only want to define it if we are, in fact, creating a .dynamic
254 section. We don't want to define it if there is no .dynamic
255 section, since on some ELF platforms the start up code examines it
256 to decide how to initialize the process. */
257 if (!_bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC"))
262 s
= bfd_make_section_with_flags (abfd
, ".hash", flags
| SEC_READONLY
);
264 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
266 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
269 if (info
->emit_gnu_hash
)
271 s
= bfd_make_section_with_flags (abfd
, ".gnu.hash",
272 flags
| SEC_READONLY
);
274 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
276 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
277 4 32-bit words followed by variable count of 64-bit words, then
278 variable count of 32-bit words. */
279 if (bed
->s
->arch_size
== 64)
280 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
282 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
285 /* Let the backend create the rest of the sections. This lets the
286 backend set the right flags. The backend will normally create
287 the .got and .plt sections. */
288 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
291 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
296 /* Create dynamic sections when linking against a dynamic object. */
299 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
301 flagword flags
, pltflags
;
302 struct elf_link_hash_entry
*h
;
304 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
305 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
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
))
328 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
330 if (bed
->want_plt_sym
)
332 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
333 "_PROCEDURE_LINKAGE_TABLE_");
334 elf_hash_table (info
)->hplt
= h
;
339 s
= bfd_make_section_with_flags (abfd
,
340 (bed
->rela_plts_and_copies_p
341 ? ".rela.plt" : ".rel.plt"),
342 flags
| SEC_READONLY
);
344 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
348 if (! _bfd_elf_create_got_section (abfd
, info
))
351 if (bed
->want_dynbss
)
353 /* The .dynbss section is a place to put symbols which are defined
354 by dynamic objects, are referenced by regular objects, and are
355 not functions. We must allocate space for them in the process
356 image and use a R_*_COPY reloc to tell the dynamic linker to
357 initialize them at run time. The linker script puts the .dynbss
358 section into the .bss section of the final image. */
359 s
= bfd_make_section_with_flags (abfd
, ".dynbss",
361 | SEC_LINKER_CREATED
));
365 /* The .rel[a].bss section holds copy relocs. This section is not
366 normally needed. We need to create it here, though, so that the
367 linker will map it to an output section. We can't just create it
368 only if we need it, because we will not know whether we need it
369 until we have seen all the input files, and the first time the
370 main linker code calls BFD after examining all the input files
371 (size_dynamic_sections) the input sections have already been
372 mapped to the output sections. If the section turns out not to
373 be needed, we can discard it later. We will never need this
374 section when generating a shared object, since they do not use
378 s
= bfd_make_section_with_flags (abfd
,
379 (bed
->rela_plts_and_copies_p
380 ? ".rela.bss" : ".rel.bss"),
381 flags
| SEC_READONLY
);
383 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
391 /* Record a new dynamic symbol. We record the dynamic symbols as we
392 read the input files, since we need to have a list of all of them
393 before we can determine the final sizes of the output sections.
394 Note that we may actually call this function even though we are not
395 going to output any dynamic symbols; in some cases we know that a
396 symbol should be in the dynamic symbol table, but only if there is
400 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
401 struct elf_link_hash_entry
*h
)
403 if (h
->dynindx
== -1)
405 struct elf_strtab_hash
*dynstr
;
410 /* XXX: The ABI draft says the linker must turn hidden and
411 internal symbols into STB_LOCAL symbols when producing the
412 DSO. However, if ld.so honors st_other in the dynamic table,
413 this would not be necessary. */
414 switch (ELF_ST_VISIBILITY (h
->other
))
418 if (h
->root
.type
!= bfd_link_hash_undefined
419 && h
->root
.type
!= bfd_link_hash_undefweak
)
422 if (!elf_hash_table (info
)->is_relocatable_executable
)
430 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
431 ++elf_hash_table (info
)->dynsymcount
;
433 dynstr
= elf_hash_table (info
)->dynstr
;
436 /* Create a strtab to hold the dynamic symbol names. */
437 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
442 /* We don't put any version information in the dynamic string
444 name
= h
->root
.root
.string
;
445 p
= strchr (name
, ELF_VER_CHR
);
447 /* We know that the p points into writable memory. In fact,
448 there are only a few symbols that have read-only names, being
449 those like _GLOBAL_OFFSET_TABLE_ that are created specially
450 by the backends. Most symbols will have names pointing into
451 an ELF string table read from a file, or to objalloc memory. */
454 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
459 if (indx
== (bfd_size_type
) -1)
461 h
->dynstr_index
= indx
;
467 /* Mark a symbol dynamic. */
470 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
471 struct elf_link_hash_entry
*h
,
472 Elf_Internal_Sym
*sym
)
474 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
476 /* It may be called more than once on the same H. */
477 if(h
->dynamic
|| info
->relocatable
)
480 if ((info
->dynamic_data
481 && (h
->type
== STT_OBJECT
483 && ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
)))
485 && h
->root
.type
== bfd_link_hash_new
486 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
490 /* Record an assignment to a symbol made by a linker script. We need
491 this in case some dynamic object refers to this symbol. */
494 bfd_elf_record_link_assignment (bfd
*output_bfd
,
495 struct bfd_link_info
*info
,
500 struct elf_link_hash_entry
*h
, *hv
;
501 struct elf_link_hash_table
*htab
;
502 const struct elf_backend_data
*bed
;
504 if (!is_elf_hash_table (info
->hash
))
507 htab
= elf_hash_table (info
);
508 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
512 switch (h
->root
.type
)
514 case bfd_link_hash_defined
:
515 case bfd_link_hash_defweak
:
516 case bfd_link_hash_common
:
518 case bfd_link_hash_undefweak
:
519 case bfd_link_hash_undefined
:
520 /* Since we're defining the symbol, don't let it seem to have not
521 been defined. record_dynamic_symbol and size_dynamic_sections
522 may depend on this. */
523 h
->root
.type
= bfd_link_hash_new
;
524 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
525 bfd_link_repair_undef_list (&htab
->root
);
527 case bfd_link_hash_new
:
528 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
531 case bfd_link_hash_indirect
:
532 /* We had a versioned symbol in a dynamic library. We make the
533 the versioned symbol point to this one. */
534 bed
= get_elf_backend_data (output_bfd
);
536 while (hv
->root
.type
== bfd_link_hash_indirect
537 || hv
->root
.type
== bfd_link_hash_warning
)
538 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
539 /* We don't need to update h->root.u since linker will set them
541 h
->root
.type
= bfd_link_hash_undefined
;
542 hv
->root
.type
= bfd_link_hash_indirect
;
543 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
544 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
546 case bfd_link_hash_warning
:
551 /* If this symbol is being provided by the linker script, and it is
552 currently defined by a dynamic object, but not by a regular
553 object, then mark it as undefined so that the generic linker will
554 force the correct value. */
558 h
->root
.type
= bfd_link_hash_undefined
;
560 /* If this symbol is not being provided by the linker script, and it is
561 currently defined by a dynamic object, but not by a regular object,
562 then clear out any version information because the symbol will not be
563 associated with the dynamic object any more. */
567 h
->verinfo
.verdef
= NULL
;
571 if (provide
&& hidden
)
573 bed
= get_elf_backend_data (output_bfd
);
574 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
575 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
578 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
580 if (!info
->relocatable
582 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
583 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
589 || (info
->executable
&& elf_hash_table (info
)->is_relocatable_executable
))
592 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
595 /* If this is a weak defined symbol, and we know a corresponding
596 real symbol from the same dynamic object, make sure the real
597 symbol is also made into a dynamic symbol. */
598 if (h
->u
.weakdef
!= NULL
599 && h
->u
.weakdef
->dynindx
== -1)
601 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
609 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
610 success, and 2 on a failure caused by attempting to record a symbol
611 in a discarded section, eg. a discarded link-once section symbol. */
614 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
619 struct elf_link_local_dynamic_entry
*entry
;
620 struct elf_link_hash_table
*eht
;
621 struct elf_strtab_hash
*dynstr
;
622 unsigned long dynstr_index
;
624 Elf_External_Sym_Shndx eshndx
;
625 char esym
[sizeof (Elf64_External_Sym
)];
627 if (! is_elf_hash_table (info
->hash
))
630 /* See if the entry exists already. */
631 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
632 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
635 amt
= sizeof (*entry
);
636 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
640 /* Go find the symbol, so that we can find it's name. */
641 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
642 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
644 bfd_release (input_bfd
, entry
);
648 if (entry
->isym
.st_shndx
!= SHN_UNDEF
649 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
653 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
654 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
656 /* We can still bfd_release here as nothing has done another
657 bfd_alloc. We can't do this later in this function. */
658 bfd_release (input_bfd
, entry
);
663 name
= (bfd_elf_string_from_elf_section
664 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
665 entry
->isym
.st_name
));
667 dynstr
= elf_hash_table (info
)->dynstr
;
670 /* Create a strtab to hold the dynamic symbol names. */
671 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
676 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
677 if (dynstr_index
== (unsigned long) -1)
679 entry
->isym
.st_name
= dynstr_index
;
681 eht
= elf_hash_table (info
);
683 entry
->next
= eht
->dynlocal
;
684 eht
->dynlocal
= entry
;
685 entry
->input_bfd
= input_bfd
;
686 entry
->input_indx
= input_indx
;
689 /* Whatever binding the symbol had before, it's now local. */
691 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
693 /* The dynindx will be set at the end of size_dynamic_sections. */
698 /* Return the dynindex of a local dynamic symbol. */
701 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
705 struct elf_link_local_dynamic_entry
*e
;
707 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
708 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
713 /* This function is used to renumber the dynamic symbols, if some of
714 them are removed because they are marked as local. This is called
715 via elf_link_hash_traverse. */
718 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
721 size_t *count
= (size_t *) data
;
723 if (h
->root
.type
== bfd_link_hash_warning
)
724 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
729 if (h
->dynindx
!= -1)
730 h
->dynindx
= ++(*count
);
736 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
737 STB_LOCAL binding. */
740 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
743 size_t *count
= (size_t *) data
;
745 if (h
->root
.type
== bfd_link_hash_warning
)
746 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
748 if (!h
->forced_local
)
751 if (h
->dynindx
!= -1)
752 h
->dynindx
= ++(*count
);
757 /* Return true if the dynamic symbol for a given section should be
758 omitted when creating a shared library. */
760 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
761 struct bfd_link_info
*info
,
764 struct elf_link_hash_table
*htab
;
766 switch (elf_section_data (p
)->this_hdr
.sh_type
)
770 /* If sh_type is yet undecided, assume it could be
771 SHT_PROGBITS/SHT_NOBITS. */
773 htab
= elf_hash_table (info
);
774 if (p
== htab
->tls_sec
)
777 if (htab
->text_index_section
!= NULL
)
778 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
780 if (strcmp (p
->name
, ".got") == 0
781 || strcmp (p
->name
, ".got.plt") == 0
782 || strcmp (p
->name
, ".plt") == 0)
786 if (htab
->dynobj
!= NULL
787 && (ip
= bfd_get_section_by_name (htab
->dynobj
, p
->name
)) != NULL
788 && (ip
->flags
& SEC_LINKER_CREATED
)
789 && ip
->output_section
== p
)
794 /* There shouldn't be section relative relocations
795 against any other section. */
801 /* Assign dynsym indices. In a shared library we generate a section
802 symbol for each output section, which come first. Next come symbols
803 which have been forced to local binding. Then all of the back-end
804 allocated local dynamic syms, followed by the rest of the global
808 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
809 struct bfd_link_info
*info
,
810 unsigned long *section_sym_count
)
812 unsigned long dynsymcount
= 0;
814 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
816 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
818 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
819 if ((p
->flags
& SEC_EXCLUDE
) == 0
820 && (p
->flags
& SEC_ALLOC
) != 0
821 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
822 elf_section_data (p
)->dynindx
= ++dynsymcount
;
824 elf_section_data (p
)->dynindx
= 0;
826 *section_sym_count
= dynsymcount
;
828 elf_link_hash_traverse (elf_hash_table (info
),
829 elf_link_renumber_local_hash_table_dynsyms
,
832 if (elf_hash_table (info
)->dynlocal
)
834 struct elf_link_local_dynamic_entry
*p
;
835 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
836 p
->dynindx
= ++dynsymcount
;
839 elf_link_hash_traverse (elf_hash_table (info
),
840 elf_link_renumber_hash_table_dynsyms
,
843 /* There is an unused NULL entry at the head of the table which
844 we must account for in our count. Unless there weren't any
845 symbols, which means we'll have no table at all. */
846 if (dynsymcount
!= 0)
849 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
853 /* Merge st_other field. */
856 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
857 Elf_Internal_Sym
*isym
, bfd_boolean definition
,
860 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
862 /* If st_other has a processor-specific meaning, specific
863 code might be needed here. We never merge the visibility
864 attribute with the one from a dynamic object. */
865 if (bed
->elf_backend_merge_symbol_attribute
)
866 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
869 /* If this symbol has default visibility and the user has requested
870 we not re-export it, then mark it as hidden. */
874 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
875 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
876 isym
->st_other
= (STV_HIDDEN
877 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
879 if (!dynamic
&& ELF_ST_VISIBILITY (isym
->st_other
) != 0)
881 unsigned char hvis
, symvis
, other
, nvis
;
883 /* Only merge the visibility. Leave the remainder of the
884 st_other field to elf_backend_merge_symbol_attribute. */
885 other
= h
->other
& ~ELF_ST_VISIBILITY (-1);
887 /* Combine visibilities, using the most constraining one. */
888 hvis
= ELF_ST_VISIBILITY (h
->other
);
889 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
895 nvis
= hvis
< symvis
? hvis
: symvis
;
897 h
->other
= other
| nvis
;
901 /* This function is called when we want to define a new symbol. It
902 handles the various cases which arise when we find a definition in
903 a dynamic object, or when there is already a definition in a
904 dynamic object. The new symbol is described by NAME, SYM, PSEC,
905 and PVALUE. We set SYM_HASH to the hash table entry. We set
906 OVERRIDE if the old symbol is overriding a new definition. We set
907 TYPE_CHANGE_OK if it is OK for the type to change. We set
908 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
909 change, we mean that we shouldn't warn if the type or size does
910 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
911 object is overridden by a regular object. */
914 _bfd_elf_merge_symbol (bfd
*abfd
,
915 struct bfd_link_info
*info
,
917 Elf_Internal_Sym
*sym
,
920 unsigned int *pold_alignment
,
921 struct elf_link_hash_entry
**sym_hash
,
923 bfd_boolean
*override
,
924 bfd_boolean
*type_change_ok
,
925 bfd_boolean
*size_change_ok
)
927 asection
*sec
, *oldsec
;
928 struct elf_link_hash_entry
*h
;
929 struct elf_link_hash_entry
*flip
;
932 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
933 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
934 const struct elf_backend_data
*bed
;
940 bind
= ELF_ST_BIND (sym
->st_info
);
942 /* Silently discard TLS symbols from --just-syms. There's no way to
943 combine a static TLS block with a new TLS block for this executable. */
944 if (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
945 && sec
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
951 if (! bfd_is_und_section (sec
))
952 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
954 h
= ((struct elf_link_hash_entry
*)
955 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
960 bed
= get_elf_backend_data (abfd
);
962 /* This code is for coping with dynamic objects, and is only useful
963 if we are doing an ELF link. */
964 if (!(*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
967 /* For merging, we only care about real symbols. */
969 while (h
->root
.type
== bfd_link_hash_indirect
970 || h
->root
.type
== bfd_link_hash_warning
)
971 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
973 /* We have to check it for every instance since the first few may be
974 refereences and not all compilers emit symbol type for undefined
976 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
978 /* If we just created the symbol, mark it as being an ELF symbol.
979 Other than that, there is nothing to do--there is no merge issue
980 with a newly defined symbol--so we just return. */
982 if (h
->root
.type
== bfd_link_hash_new
)
988 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
991 switch (h
->root
.type
)
998 case bfd_link_hash_undefined
:
999 case bfd_link_hash_undefweak
:
1000 oldbfd
= h
->root
.u
.undef
.abfd
;
1004 case bfd_link_hash_defined
:
1005 case bfd_link_hash_defweak
:
1006 oldbfd
= h
->root
.u
.def
.section
->owner
;
1007 oldsec
= h
->root
.u
.def
.section
;
1010 case bfd_link_hash_common
:
1011 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1012 oldsec
= h
->root
.u
.c
.p
->section
;
1016 /* In cases involving weak versioned symbols, we may wind up trying
1017 to merge a symbol with itself. Catch that here, to avoid the
1018 confusion that results if we try to override a symbol with
1019 itself. The additional tests catch cases like
1020 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1021 dynamic object, which we do want to handle here. */
1023 && ((abfd
->flags
& DYNAMIC
) == 0
1024 || !h
->def_regular
))
1027 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1028 respectively, is from a dynamic object. */
1030 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1034 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1035 else if (oldsec
!= NULL
)
1037 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1038 indices used by MIPS ELF. */
1039 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1042 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1043 respectively, appear to be a definition rather than reference. */
1045 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1047 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1048 && h
->root
.type
!= bfd_link_hash_undefweak
1049 && h
->root
.type
!= bfd_link_hash_common
);
1051 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1052 respectively, appear to be a function. */
1054 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1055 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1057 oldfunc
= (h
->type
!= STT_NOTYPE
1058 && bed
->is_function_type (h
->type
));
1060 /* When we try to create a default indirect symbol from the dynamic
1061 definition with the default version, we skip it if its type and
1062 the type of existing regular definition mismatch. We only do it
1063 if the existing regular definition won't be dynamic. */
1064 if (pold_alignment
== NULL
1066 && !info
->export_dynamic
1071 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
1072 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1073 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1074 && h
->type
!= STT_NOTYPE
1075 && !(newfunc
&& oldfunc
))
1081 /* Check TLS symbol. We don't check undefined symbol introduced by
1083 if ((ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
)
1084 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1088 bfd_boolean ntdef
, tdef
;
1089 asection
*ntsec
, *tsec
;
1091 if (h
->type
== STT_TLS
)
1111 (*_bfd_error_handler
)
1112 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1113 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1114 else if (!tdef
&& !ntdef
)
1115 (*_bfd_error_handler
)
1116 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1117 tbfd
, ntbfd
, h
->root
.root
.string
);
1119 (*_bfd_error_handler
)
1120 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1121 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1123 (*_bfd_error_handler
)
1124 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1125 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1127 bfd_set_error (bfd_error_bad_value
);
1131 /* We need to remember if a symbol has a definition in a dynamic
1132 object or is weak in all dynamic objects. Internal and hidden
1133 visibility will make it unavailable to dynamic objects. */
1134 if (newdyn
&& !h
->dynamic_def
)
1136 if (!bfd_is_und_section (sec
))
1140 /* Check if this symbol is weak in all dynamic objects. If it
1141 is the first time we see it in a dynamic object, we mark
1142 if it is weak. Otherwise, we clear it. */
1143 if (!h
->ref_dynamic
)
1145 if (bind
== STB_WEAK
)
1146 h
->dynamic_weak
= 1;
1148 else if (bind
!= STB_WEAK
)
1149 h
->dynamic_weak
= 0;
1153 /* If the old symbol has non-default visibility, we ignore the new
1154 definition from a dynamic object. */
1156 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1157 && !bfd_is_und_section (sec
))
1160 /* Make sure this symbol is dynamic. */
1162 /* A protected symbol has external availability. Make sure it is
1163 recorded as dynamic.
1165 FIXME: Should we check type and size for protected symbol? */
1166 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1167 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1172 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1175 /* If the new symbol with non-default visibility comes from a
1176 relocatable file and the old definition comes from a dynamic
1177 object, we remove the old definition. */
1178 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1180 /* Handle the case where the old dynamic definition is
1181 default versioned. We need to copy the symbol info from
1182 the symbol with default version to the normal one if it
1183 was referenced before. */
1186 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 (bind
== STB_GNU_UNIQUE
)
1250 h
->unique_global
= 1;
1252 /* If a new weak symbol definition comes from a regular file and the
1253 old symbol comes from a dynamic library, we treat the new one as
1254 strong. Similarly, an old weak symbol definition from a regular
1255 file is treated as strong when the new symbol comes from a dynamic
1256 library. Further, an old weak symbol from a dynamic library is
1257 treated as strong if the new symbol is from a dynamic library.
1258 This reflects the way glibc's ld.so works.
1260 Do this before setting *type_change_ok or *size_change_ok so that
1261 we warn properly when dynamic library symbols are overridden. */
1263 if (newdef
&& !newdyn
&& olddyn
)
1265 if (olddef
&& newdyn
)
1268 /* Allow changes between different types of function symbol. */
1269 if (newfunc
&& oldfunc
)
1270 *type_change_ok
= TRUE
;
1272 /* It's OK to change the type if either the existing symbol or the
1273 new symbol is weak. A type change is also OK if the old symbol
1274 is undefined and the new symbol is defined. */
1279 && h
->root
.type
== bfd_link_hash_undefined
))
1280 *type_change_ok
= TRUE
;
1282 /* It's OK to change the size if either the existing symbol or the
1283 new symbol is weak, or if the old symbol is undefined. */
1286 || h
->root
.type
== bfd_link_hash_undefined
)
1287 *size_change_ok
= TRUE
;
1289 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1290 symbol, respectively, appears to be a common symbol in a dynamic
1291 object. If a symbol appears in an uninitialized section, and is
1292 not weak, and is not a function, then it may be a common symbol
1293 which was resolved when the dynamic object was created. We want
1294 to treat such symbols specially, because they raise special
1295 considerations when setting the symbol size: if the symbol
1296 appears as a common symbol in a regular object, and the size in
1297 the regular object is larger, we must make sure that we use the
1298 larger size. This problematic case can always be avoided in C,
1299 but it must be handled correctly when using Fortran shared
1302 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1303 likewise for OLDDYNCOMMON and OLDDEF.
1305 Note that this test is just a heuristic, and that it is quite
1306 possible to have an uninitialized symbol in a shared object which
1307 is really a definition, rather than a common symbol. This could
1308 lead to some minor confusion when the symbol really is a common
1309 symbol in some regular object. However, I think it will be
1315 && (sec
->flags
& SEC_ALLOC
) != 0
1316 && (sec
->flags
& SEC_LOAD
) == 0
1319 newdyncommon
= TRUE
;
1321 newdyncommon
= FALSE
;
1325 && h
->root
.type
== bfd_link_hash_defined
1327 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1328 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1331 olddyncommon
= TRUE
;
1333 olddyncommon
= FALSE
;
1335 /* We now know everything about the old and new symbols. We ask the
1336 backend to check if we can merge them. */
1337 if (bed
->merge_symbol
1338 && !bed
->merge_symbol (info
, sym_hash
, h
, sym
, psec
, pvalue
,
1339 pold_alignment
, skip
, override
,
1340 type_change_ok
, size_change_ok
,
1341 &newdyn
, &newdef
, &newdyncommon
, &newweak
,
1343 &olddyn
, &olddef
, &olddyncommon
, &oldweak
,
1347 /* If both the old and the new symbols look like common symbols in a
1348 dynamic object, set the size of the symbol to the larger of the
1353 && sym
->st_size
!= h
->size
)
1355 /* Since we think we have two common symbols, issue a multiple
1356 common warning if desired. Note that we only warn if the
1357 size is different. If the size is the same, we simply let
1358 the old symbol override the new one as normally happens with
1359 symbols defined in dynamic objects. */
1361 if (! ((*info
->callbacks
->multiple_common
)
1362 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1363 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1366 if (sym
->st_size
> h
->size
)
1367 h
->size
= sym
->st_size
;
1369 *size_change_ok
= TRUE
;
1372 /* If we are looking at a dynamic object, and we have found a
1373 definition, we need to see if the symbol was already defined by
1374 some other object. If so, we want to use the existing
1375 definition, and we do not want to report a multiple symbol
1376 definition error; we do this by clobbering *PSEC to be
1377 bfd_und_section_ptr.
1379 We treat a common symbol as a definition if the symbol in the
1380 shared library is a function, since common symbols always
1381 represent variables; this can cause confusion in principle, but
1382 any such confusion would seem to indicate an erroneous program or
1383 shared library. We also permit a common symbol in a regular
1384 object to override a weak symbol in a shared object. */
1389 || (h
->root
.type
== bfd_link_hash_common
1390 && (newweak
|| newfunc
))))
1394 newdyncommon
= FALSE
;
1396 *psec
= sec
= bfd_und_section_ptr
;
1397 *size_change_ok
= TRUE
;
1399 /* If we get here when the old symbol is a common symbol, then
1400 we are explicitly letting it override a weak symbol or
1401 function in a dynamic object, and we don't want to warn about
1402 a type change. If the old symbol is a defined symbol, a type
1403 change warning may still be appropriate. */
1405 if (h
->root
.type
== bfd_link_hash_common
)
1406 *type_change_ok
= TRUE
;
1409 /* Handle the special case of an old common symbol merging with a
1410 new symbol which looks like a common symbol in a shared object.
1411 We change *PSEC and *PVALUE to make the new symbol look like a
1412 common symbol, and let _bfd_generic_link_add_one_symbol do the
1416 && h
->root
.type
== bfd_link_hash_common
)
1420 newdyncommon
= FALSE
;
1421 *pvalue
= sym
->st_size
;
1422 *psec
= sec
= bed
->common_section (oldsec
);
1423 *size_change_ok
= TRUE
;
1426 /* Skip weak definitions of symbols that are already defined. */
1427 if (newdef
&& olddef
&& newweak
)
1431 /* Merge st_other. If the symbol already has a dynamic index,
1432 but visibility says it should not be visible, turn it into a
1434 elf_merge_st_other (abfd
, h
, sym
, newdef
, newdyn
);
1435 if (h
->dynindx
!= -1)
1436 switch (ELF_ST_VISIBILITY (h
->other
))
1440 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1445 /* If the old symbol is from a dynamic object, and the new symbol is
1446 a definition which is not from a dynamic object, then the new
1447 symbol overrides the old symbol. Symbols from regular files
1448 always take precedence over symbols from dynamic objects, even if
1449 they are defined after the dynamic object in the link.
1451 As above, we again permit a common symbol in a regular object to
1452 override a definition in a shared object if the shared object
1453 symbol is a function or is weak. */
1458 || (bfd_is_com_section (sec
)
1459 && (oldweak
|| oldfunc
)))
1464 /* Change the hash table entry to undefined, and let
1465 _bfd_generic_link_add_one_symbol do the right thing with the
1468 h
->root
.type
= bfd_link_hash_undefined
;
1469 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1470 *size_change_ok
= TRUE
;
1473 olddyncommon
= FALSE
;
1475 /* We again permit a type change when a common symbol may be
1476 overriding a function. */
1478 if (bfd_is_com_section (sec
))
1482 /* If a common symbol overrides a function, make sure
1483 that it isn't defined dynamically nor has type
1486 h
->type
= STT_NOTYPE
;
1488 *type_change_ok
= TRUE
;
1491 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1494 /* This union may have been set to be non-NULL when this symbol
1495 was seen in a dynamic object. We must force the union to be
1496 NULL, so that it is correct for a regular symbol. */
1497 h
->verinfo
.vertree
= NULL
;
1500 /* Handle the special case of a new common symbol merging with an
1501 old symbol that looks like it might be a common symbol defined in
1502 a shared object. Note that we have already handled the case in
1503 which a new common symbol should simply override the definition
1504 in the shared library. */
1507 && bfd_is_com_section (sec
)
1510 /* It would be best if we could set the hash table entry to a
1511 common symbol, but we don't know what to use for the section
1512 or the alignment. */
1513 if (! ((*info
->callbacks
->multiple_common
)
1514 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1515 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1518 /* If the presumed common symbol in the dynamic object is
1519 larger, pretend that the new symbol has its size. */
1521 if (h
->size
> *pvalue
)
1524 /* We need to remember the alignment required by the symbol
1525 in the dynamic object. */
1526 BFD_ASSERT (pold_alignment
);
1527 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1530 olddyncommon
= FALSE
;
1532 h
->root
.type
= bfd_link_hash_undefined
;
1533 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1535 *size_change_ok
= TRUE
;
1536 *type_change_ok
= TRUE
;
1538 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1541 h
->verinfo
.vertree
= NULL
;
1546 /* Handle the case where we had a versioned symbol in a dynamic
1547 library and now find a definition in a normal object. In this
1548 case, we make the versioned symbol point to the normal one. */
1549 flip
->root
.type
= h
->root
.type
;
1550 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1551 h
->root
.type
= bfd_link_hash_indirect
;
1552 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1553 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1557 flip
->ref_dynamic
= 1;
1564 /* This function is called to create an indirect symbol from the
1565 default for the symbol with the default version if needed. The
1566 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1567 set DYNSYM if the new indirect symbol is dynamic. */
1570 _bfd_elf_add_default_symbol (bfd
*abfd
,
1571 struct bfd_link_info
*info
,
1572 struct elf_link_hash_entry
*h
,
1574 Elf_Internal_Sym
*sym
,
1577 bfd_boolean
*dynsym
,
1578 bfd_boolean override
)
1580 bfd_boolean type_change_ok
;
1581 bfd_boolean size_change_ok
;
1584 struct elf_link_hash_entry
*hi
;
1585 struct bfd_link_hash_entry
*bh
;
1586 const struct elf_backend_data
*bed
;
1587 bfd_boolean collect
;
1588 bfd_boolean dynamic
;
1590 size_t len
, shortlen
;
1593 /* If this symbol has a version, and it is the default version, we
1594 create an indirect symbol from the default name to the fully
1595 decorated name. This will cause external references which do not
1596 specify a version to be bound to this version of the symbol. */
1597 p
= strchr (name
, ELF_VER_CHR
);
1598 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1603 /* We are overridden by an old definition. We need to check if we
1604 need to create the indirect symbol from the default name. */
1605 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1607 BFD_ASSERT (hi
!= NULL
);
1610 while (hi
->root
.type
== bfd_link_hash_indirect
1611 || hi
->root
.type
== bfd_link_hash_warning
)
1613 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1619 bed
= get_elf_backend_data (abfd
);
1620 collect
= bed
->collect
;
1621 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1623 shortlen
= p
- name
;
1624 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1625 if (shortname
== NULL
)
1627 memcpy (shortname
, name
, shortlen
);
1628 shortname
[shortlen
] = '\0';
1630 /* We are going to create a new symbol. Merge it with any existing
1631 symbol with this name. For the purposes of the merge, act as
1632 though we were defining the symbol we just defined, although we
1633 actually going to define an indirect symbol. */
1634 type_change_ok
= FALSE
;
1635 size_change_ok
= FALSE
;
1637 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1638 NULL
, &hi
, &skip
, &override
,
1639 &type_change_ok
, &size_change_ok
))
1648 if (! (_bfd_generic_link_add_one_symbol
1649 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1650 0, name
, FALSE
, collect
, &bh
)))
1652 hi
= (struct elf_link_hash_entry
*) bh
;
1656 /* In this case the symbol named SHORTNAME is overriding the
1657 indirect symbol we want to add. We were planning on making
1658 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1659 is the name without a version. NAME is the fully versioned
1660 name, and it is the default version.
1662 Overriding means that we already saw a definition for the
1663 symbol SHORTNAME in a regular object, and it is overriding
1664 the symbol defined in the dynamic object.
1666 When this happens, we actually want to change NAME, the
1667 symbol we just added, to refer to SHORTNAME. This will cause
1668 references to NAME in the shared object to become references
1669 to SHORTNAME in the regular object. This is what we expect
1670 when we override a function in a shared object: that the
1671 references in the shared object will be mapped to the
1672 definition in the regular object. */
1674 while (hi
->root
.type
== bfd_link_hash_indirect
1675 || hi
->root
.type
== bfd_link_hash_warning
)
1676 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1678 h
->root
.type
= bfd_link_hash_indirect
;
1679 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1683 hi
->ref_dynamic
= 1;
1687 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1692 /* Now set HI to H, so that the following code will set the
1693 other fields correctly. */
1697 /* Check if HI is a warning symbol. */
1698 if (hi
->root
.type
== bfd_link_hash_warning
)
1699 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1701 /* If there is a duplicate definition somewhere, then HI may not
1702 point to an indirect symbol. We will have reported an error to
1703 the user in that case. */
1705 if (hi
->root
.type
== bfd_link_hash_indirect
)
1707 struct elf_link_hash_entry
*ht
;
1709 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1710 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1712 /* See if the new flags lead us to realize that the symbol must
1724 if (hi
->ref_regular
)
1730 /* We also need to define an indirection from the nondefault version
1734 len
= strlen (name
);
1735 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
1736 if (shortname
== NULL
)
1738 memcpy (shortname
, name
, shortlen
);
1739 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1741 /* Once again, merge with any existing symbol. */
1742 type_change_ok
= FALSE
;
1743 size_change_ok
= FALSE
;
1745 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1746 NULL
, &hi
, &skip
, &override
,
1747 &type_change_ok
, &size_change_ok
))
1755 /* Here SHORTNAME is a versioned name, so we don't expect to see
1756 the type of override we do in the case above unless it is
1757 overridden by a versioned definition. */
1758 if (hi
->root
.type
!= bfd_link_hash_defined
1759 && hi
->root
.type
!= bfd_link_hash_defweak
)
1760 (*_bfd_error_handler
)
1761 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1767 if (! (_bfd_generic_link_add_one_symbol
1768 (info
, abfd
, shortname
, BSF_INDIRECT
,
1769 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1771 hi
= (struct elf_link_hash_entry
*) bh
;
1773 /* If there is a duplicate definition somewhere, then HI may not
1774 point to an indirect symbol. We will have reported an error
1775 to the user in that case. */
1777 if (hi
->root
.type
== bfd_link_hash_indirect
)
1779 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1781 /* See if the new flags lead us to realize that the symbol
1793 if (hi
->ref_regular
)
1803 /* This routine is used to export all defined symbols into the dynamic
1804 symbol table. It is called via elf_link_hash_traverse. */
1807 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1809 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1811 /* Ignore this if we won't export it. */
1812 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
1815 /* Ignore indirect symbols. These are added by the versioning code. */
1816 if (h
->root
.type
== bfd_link_hash_indirect
)
1819 if (h
->root
.type
== bfd_link_hash_warning
)
1820 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1822 if (h
->dynindx
== -1
1828 if (eif
->verdefs
== NULL
1829 || (bfd_find_version_for_sym (eif
->verdefs
, h
->root
.root
.string
, &hide
)
1832 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1843 /* Look through the symbols which are defined in other shared
1844 libraries and referenced here. Update the list of version
1845 dependencies. This will be put into the .gnu.version_r section.
1846 This function is called via elf_link_hash_traverse. */
1849 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1852 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
1853 Elf_Internal_Verneed
*t
;
1854 Elf_Internal_Vernaux
*a
;
1857 if (h
->root
.type
== bfd_link_hash_warning
)
1858 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1860 /* We only care about symbols defined in shared objects with version
1865 || h
->verinfo
.verdef
== NULL
)
1868 /* See if we already know about this version. */
1869 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1873 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1876 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1877 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1883 /* This is a new version. Add it to tree we are building. */
1888 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1891 rinfo
->failed
= TRUE
;
1895 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1896 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1897 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
1901 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1904 rinfo
->failed
= TRUE
;
1908 /* Note that we are copying a string pointer here, and testing it
1909 above. If bfd_elf_string_from_elf_section is ever changed to
1910 discard the string data when low in memory, this will have to be
1912 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1914 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1915 a
->vna_nextptr
= t
->vn_auxptr
;
1917 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1920 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1927 /* Figure out appropriate versions for all the symbols. We may not
1928 have the version number script until we have read all of the input
1929 files, so until that point we don't know which symbols should be
1930 local. This function is called via elf_link_hash_traverse. */
1933 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1935 struct elf_info_failed
*sinfo
;
1936 struct bfd_link_info
*info
;
1937 const struct elf_backend_data
*bed
;
1938 struct elf_info_failed eif
;
1942 sinfo
= (struct elf_info_failed
*) data
;
1945 if (h
->root
.type
== bfd_link_hash_warning
)
1946 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1948 /* Fix the symbol flags. */
1951 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1954 sinfo
->failed
= TRUE
;
1958 /* We only need version numbers for symbols defined in regular
1960 if (!h
->def_regular
)
1963 bed
= get_elf_backend_data (info
->output_bfd
);
1964 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1965 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1967 struct bfd_elf_version_tree
*t
;
1972 /* There are two consecutive ELF_VER_CHR characters if this is
1973 not a hidden symbol. */
1975 if (*p
== ELF_VER_CHR
)
1981 /* If there is no version string, we can just return out. */
1989 /* Look for the version. If we find it, it is no longer weak. */
1990 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1992 if (strcmp (t
->name
, p
) == 0)
1996 struct bfd_elf_version_expr
*d
;
1998 len
= p
- h
->root
.root
.string
;
1999 alc
= (char *) bfd_malloc (len
);
2002 sinfo
->failed
= TRUE
;
2005 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2006 alc
[len
- 1] = '\0';
2007 if (alc
[len
- 2] == ELF_VER_CHR
)
2008 alc
[len
- 2] = '\0';
2010 h
->verinfo
.vertree
= t
;
2014 if (t
->globals
.list
!= NULL
)
2015 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2017 /* See if there is anything to force this symbol to
2019 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2021 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2024 && ! info
->export_dynamic
)
2025 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2033 /* If we are building an application, we need to create a
2034 version node for this version. */
2035 if (t
== NULL
&& info
->executable
)
2037 struct bfd_elf_version_tree
**pp
;
2040 /* If we aren't going to export this symbol, we don't need
2041 to worry about it. */
2042 if (h
->dynindx
== -1)
2046 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
, amt
);
2049 sinfo
->failed
= TRUE
;
2054 t
->name_indx
= (unsigned int) -1;
2058 /* Don't count anonymous version tag. */
2059 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
2061 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2063 t
->vernum
= version_index
;
2067 h
->verinfo
.vertree
= t
;
2071 /* We could not find the version for a symbol when
2072 generating a shared archive. Return an error. */
2073 (*_bfd_error_handler
)
2074 (_("%B: version node not found for symbol %s"),
2075 info
->output_bfd
, h
->root
.root
.string
);
2076 bfd_set_error (bfd_error_bad_value
);
2077 sinfo
->failed
= TRUE
;
2085 /* If we don't have a version for this symbol, see if we can find
2087 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2091 h
->verinfo
.vertree
= bfd_find_version_for_sym (sinfo
->verdefs
,
2092 h
->root
.root
.string
, &hide
);
2093 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2094 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2100 /* Read and swap the relocs from the section indicated by SHDR. This
2101 may be either a REL or a RELA section. The relocations are
2102 translated into RELA relocations and stored in INTERNAL_RELOCS,
2103 which should have already been allocated to contain enough space.
2104 The EXTERNAL_RELOCS are a buffer where the external form of the
2105 relocations should be stored.
2107 Returns FALSE if something goes wrong. */
2110 elf_link_read_relocs_from_section (bfd
*abfd
,
2112 Elf_Internal_Shdr
*shdr
,
2113 void *external_relocs
,
2114 Elf_Internal_Rela
*internal_relocs
)
2116 const struct elf_backend_data
*bed
;
2117 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2118 const bfd_byte
*erela
;
2119 const bfd_byte
*erelaend
;
2120 Elf_Internal_Rela
*irela
;
2121 Elf_Internal_Shdr
*symtab_hdr
;
2124 /* Position ourselves at the start of the section. */
2125 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2128 /* Read the relocations. */
2129 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2132 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2133 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2135 bed
= get_elf_backend_data (abfd
);
2137 /* Convert the external relocations to the internal format. */
2138 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2139 swap_in
= bed
->s
->swap_reloc_in
;
2140 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2141 swap_in
= bed
->s
->swap_reloca_in
;
2144 bfd_set_error (bfd_error_wrong_format
);
2148 erela
= (const bfd_byte
*) external_relocs
;
2149 erelaend
= erela
+ shdr
->sh_size
;
2150 irela
= internal_relocs
;
2151 while (erela
< erelaend
)
2155 (*swap_in
) (abfd
, erela
, irela
);
2156 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2157 if (bed
->s
->arch_size
== 64)
2161 if ((size_t) r_symndx
>= nsyms
)
2163 (*_bfd_error_handler
)
2164 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2165 " for offset 0x%lx in section `%A'"),
2167 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2168 bfd_set_error (bfd_error_bad_value
);
2172 else if (r_symndx
!= 0)
2174 (*_bfd_error_handler
)
2175 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2176 " when the object file has no symbol table"),
2178 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2179 bfd_set_error (bfd_error_bad_value
);
2182 irela
+= bed
->s
->int_rels_per_ext_rel
;
2183 erela
+= shdr
->sh_entsize
;
2189 /* Read and swap the relocs for a section O. They may have been
2190 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2191 not NULL, they are used as buffers to read into. They are known to
2192 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2193 the return value is allocated using either malloc or bfd_alloc,
2194 according to the KEEP_MEMORY argument. If O has two relocation
2195 sections (both REL and RELA relocations), then the REL_HDR
2196 relocations will appear first in INTERNAL_RELOCS, followed by the
2197 REL_HDR2 relocations. */
2200 _bfd_elf_link_read_relocs (bfd
*abfd
,
2202 void *external_relocs
,
2203 Elf_Internal_Rela
*internal_relocs
,
2204 bfd_boolean keep_memory
)
2206 Elf_Internal_Shdr
*rel_hdr
;
2207 void *alloc1
= NULL
;
2208 Elf_Internal_Rela
*alloc2
= NULL
;
2209 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2211 if (elf_section_data (o
)->relocs
!= NULL
)
2212 return elf_section_data (o
)->relocs
;
2214 if (o
->reloc_count
== 0)
2217 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2219 if (internal_relocs
== NULL
)
2223 size
= o
->reloc_count
;
2224 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2226 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2228 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2229 if (internal_relocs
== NULL
)
2233 if (external_relocs
== NULL
)
2235 bfd_size_type size
= rel_hdr
->sh_size
;
2237 if (elf_section_data (o
)->rel_hdr2
)
2238 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2239 alloc1
= bfd_malloc (size
);
2242 external_relocs
= alloc1
;
2245 if (!elf_link_read_relocs_from_section (abfd
, o
, rel_hdr
,
2249 if (elf_section_data (o
)->rel_hdr2
2250 && (!elf_link_read_relocs_from_section
2252 elf_section_data (o
)->rel_hdr2
,
2253 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2254 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2255 * bed
->s
->int_rels_per_ext_rel
))))
2258 /* Cache the results for next time, if we can. */
2260 elf_section_data (o
)->relocs
= internal_relocs
;
2265 /* Don't free alloc2, since if it was allocated we are passing it
2266 back (under the name of internal_relocs). */
2268 return internal_relocs
;
2276 bfd_release (abfd
, alloc2
);
2283 /* Compute the size of, and allocate space for, REL_HDR which is the
2284 section header for a section containing relocations for O. */
2287 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2288 Elf_Internal_Shdr
*rel_hdr
,
2291 bfd_size_type reloc_count
;
2292 bfd_size_type num_rel_hashes
;
2294 /* Figure out how many relocations there will be. */
2295 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
2296 reloc_count
= elf_section_data (o
)->rel_count
;
2298 reloc_count
= elf_section_data (o
)->rel_count2
;
2300 num_rel_hashes
= o
->reloc_count
;
2301 if (num_rel_hashes
< reloc_count
)
2302 num_rel_hashes
= reloc_count
;
2304 /* That allows us to calculate the size of the section. */
2305 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
2307 /* The contents field must last into write_object_contents, so we
2308 allocate it with bfd_alloc rather than malloc. Also since we
2309 cannot be sure that the contents will actually be filled in,
2310 we zero the allocated space. */
2311 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2312 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2315 /* We only allocate one set of hash entries, so we only do it the
2316 first time we are called. */
2317 if (elf_section_data (o
)->rel_hashes
== NULL
2320 struct elf_link_hash_entry
**p
;
2322 p
= (struct elf_link_hash_entry
**)
2323 bfd_zmalloc (num_rel_hashes
* sizeof (struct elf_link_hash_entry
*));
2327 elf_section_data (o
)->rel_hashes
= p
;
2333 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2334 originated from the section given by INPUT_REL_HDR) to the
2338 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2339 asection
*input_section
,
2340 Elf_Internal_Shdr
*input_rel_hdr
,
2341 Elf_Internal_Rela
*internal_relocs
,
2342 struct elf_link_hash_entry
**rel_hash
2345 Elf_Internal_Rela
*irela
;
2346 Elf_Internal_Rela
*irelaend
;
2348 Elf_Internal_Shdr
*output_rel_hdr
;
2349 asection
*output_section
;
2350 unsigned int *rel_countp
= NULL
;
2351 const struct elf_backend_data
*bed
;
2352 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2354 output_section
= input_section
->output_section
;
2355 output_rel_hdr
= NULL
;
2357 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
2358 == input_rel_hdr
->sh_entsize
)
2360 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
2361 rel_countp
= &elf_section_data (output_section
)->rel_count
;
2363 else if (elf_section_data (output_section
)->rel_hdr2
2364 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
2365 == input_rel_hdr
->sh_entsize
))
2367 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
2368 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
2372 (*_bfd_error_handler
)
2373 (_("%B: relocation size mismatch in %B section %A"),
2374 output_bfd
, input_section
->owner
, input_section
);
2375 bfd_set_error (bfd_error_wrong_format
);
2379 bed
= get_elf_backend_data (output_bfd
);
2380 if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2381 swap_out
= bed
->s
->swap_reloc_out
;
2382 else if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2383 swap_out
= bed
->s
->swap_reloca_out
;
2387 erel
= output_rel_hdr
->contents
;
2388 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
2389 irela
= internal_relocs
;
2390 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2391 * bed
->s
->int_rels_per_ext_rel
);
2392 while (irela
< irelaend
)
2394 (*swap_out
) (output_bfd
, irela
, erel
);
2395 irela
+= bed
->s
->int_rels_per_ext_rel
;
2396 erel
+= input_rel_hdr
->sh_entsize
;
2399 /* Bump the counter, so that we know where to add the next set of
2401 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2406 /* Make weak undefined symbols in PIE dynamic. */
2409 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2410 struct elf_link_hash_entry
*h
)
2414 && h
->root
.type
== bfd_link_hash_undefweak
)
2415 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2420 /* Fix up the flags for a symbol. This handles various cases which
2421 can only be fixed after all the input files are seen. This is
2422 currently called by both adjust_dynamic_symbol and
2423 assign_sym_version, which is unnecessary but perhaps more robust in
2424 the face of future changes. */
2427 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2428 struct elf_info_failed
*eif
)
2430 const struct elf_backend_data
*bed
;
2432 /* If this symbol was mentioned in a non-ELF file, try to set
2433 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2434 permit a non-ELF file to correctly refer to a symbol defined in
2435 an ELF dynamic object. */
2438 while (h
->root
.type
== bfd_link_hash_indirect
)
2439 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2441 if (h
->root
.type
!= bfd_link_hash_defined
2442 && h
->root
.type
!= bfd_link_hash_defweak
)
2445 h
->ref_regular_nonweak
= 1;
2449 if (h
->root
.u
.def
.section
->owner
!= NULL
2450 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2451 == bfd_target_elf_flavour
))
2454 h
->ref_regular_nonweak
= 1;
2460 if (h
->dynindx
== -1
2464 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2473 /* Unfortunately, NON_ELF is only correct if the symbol
2474 was first seen in a non-ELF file. Fortunately, if the symbol
2475 was first seen in an ELF file, we're probably OK unless the
2476 symbol was defined in a non-ELF file. Catch that case here.
2477 FIXME: We're still in trouble if the symbol was first seen in
2478 a dynamic object, and then later in a non-ELF regular object. */
2479 if ((h
->root
.type
== bfd_link_hash_defined
2480 || h
->root
.type
== bfd_link_hash_defweak
)
2482 && (h
->root
.u
.def
.section
->owner
!= NULL
2483 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2484 != bfd_target_elf_flavour
)
2485 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2486 && !h
->def_dynamic
)))
2490 /* Backend specific symbol fixup. */
2491 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2492 if (bed
->elf_backend_fixup_symbol
2493 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2496 /* If this is a final link, and the symbol was defined as a common
2497 symbol in a regular object file, and there was no definition in
2498 any dynamic object, then the linker will have allocated space for
2499 the symbol in a common section but the DEF_REGULAR
2500 flag will not have been set. */
2501 if (h
->root
.type
== bfd_link_hash_defined
2505 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2508 /* If -Bsymbolic was used (which means to bind references to global
2509 symbols to the definition within the shared object), and this
2510 symbol was defined in a regular object, then it actually doesn't
2511 need a PLT entry. Likewise, if the symbol has non-default
2512 visibility. If the symbol has hidden or internal visibility, we
2513 will force it local. */
2515 && eif
->info
->shared
2516 && is_elf_hash_table (eif
->info
->hash
)
2517 && (SYMBOLIC_BIND (eif
->info
, h
)
2518 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2521 bfd_boolean force_local
;
2523 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2524 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2525 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2528 /* If a weak undefined symbol has non-default visibility, we also
2529 hide it from the dynamic linker. */
2530 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2531 && h
->root
.type
== bfd_link_hash_undefweak
)
2532 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2534 /* If this is a weak defined symbol in a dynamic object, and we know
2535 the real definition in the dynamic object, copy interesting flags
2536 over to the real definition. */
2537 if (h
->u
.weakdef
!= NULL
)
2539 struct elf_link_hash_entry
*weakdef
;
2541 weakdef
= h
->u
.weakdef
;
2542 if (h
->root
.type
== bfd_link_hash_indirect
)
2543 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2545 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2546 || h
->root
.type
== bfd_link_hash_defweak
);
2547 BFD_ASSERT (weakdef
->def_dynamic
);
2549 /* If the real definition is defined by a regular object file,
2550 don't do anything special. See the longer description in
2551 _bfd_elf_adjust_dynamic_symbol, below. */
2552 if (weakdef
->def_regular
)
2553 h
->u
.weakdef
= NULL
;
2556 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2557 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2558 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2565 /* Make the backend pick a good value for a dynamic symbol. This is
2566 called via elf_link_hash_traverse, and also calls itself
2570 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2572 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2574 const struct elf_backend_data
*bed
;
2576 if (! is_elf_hash_table (eif
->info
->hash
))
2579 if (h
->root
.type
== bfd_link_hash_warning
)
2581 h
->got
= elf_hash_table (eif
->info
)->init_got_offset
;
2582 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2584 /* When warning symbols are created, they **replace** the "real"
2585 entry in the hash table, thus we never get to see the real
2586 symbol in a hash traversal. So look at it now. */
2587 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2590 /* Ignore indirect symbols. These are added by the versioning code. */
2591 if (h
->root
.type
== bfd_link_hash_indirect
)
2594 /* Fix the symbol flags. */
2595 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2598 /* If this symbol does not require a PLT entry, and it is not
2599 defined by a dynamic object, or is not referenced by a regular
2600 object, ignore it. We do have to handle a weak defined symbol,
2601 even if no regular object refers to it, if we decided to add it
2602 to the dynamic symbol table. FIXME: Do we normally need to worry
2603 about symbols which are defined by one dynamic object and
2604 referenced by another one? */
2606 && h
->type
!= STT_GNU_IFUNC
2610 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2612 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2616 /* If we've already adjusted this symbol, don't do it again. This
2617 can happen via a recursive call. */
2618 if (h
->dynamic_adjusted
)
2621 /* Don't look at this symbol again. Note that we must set this
2622 after checking the above conditions, because we may look at a
2623 symbol once, decide not to do anything, and then get called
2624 recursively later after REF_REGULAR is set below. */
2625 h
->dynamic_adjusted
= 1;
2627 /* If this is a weak definition, and we know a real definition, and
2628 the real symbol is not itself defined by a regular object file,
2629 then get a good value for the real definition. We handle the
2630 real symbol first, for the convenience of the backend routine.
2632 Note that there is a confusing case here. If the real definition
2633 is defined by a regular object file, we don't get the real symbol
2634 from the dynamic object, but we do get the weak symbol. If the
2635 processor backend uses a COPY reloc, then if some routine in the
2636 dynamic object changes the real symbol, we will not see that
2637 change in the corresponding weak symbol. This is the way other
2638 ELF linkers work as well, and seems to be a result of the shared
2641 I will clarify this issue. Most SVR4 shared libraries define the
2642 variable _timezone and define timezone as a weak synonym. The
2643 tzset call changes _timezone. If you write
2644 extern int timezone;
2646 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2647 you might expect that, since timezone is a synonym for _timezone,
2648 the same number will print both times. However, if the processor
2649 backend uses a COPY reloc, then actually timezone will be copied
2650 into your process image, and, since you define _timezone
2651 yourself, _timezone will not. Thus timezone and _timezone will
2652 wind up at different memory locations. The tzset call will set
2653 _timezone, leaving timezone unchanged. */
2655 if (h
->u
.weakdef
!= NULL
)
2657 /* If we get to this point, we know there is an implicit
2658 reference by a regular object file via the weak symbol H.
2659 FIXME: Is this really true? What if the traversal finds
2660 H->U.WEAKDEF before it finds H? */
2661 h
->u
.weakdef
->ref_regular
= 1;
2663 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2667 /* If a symbol has no type and no size and does not require a PLT
2668 entry, then we are probably about to do the wrong thing here: we
2669 are probably going to create a COPY reloc for an empty object.
2670 This case can arise when a shared object is built with assembly
2671 code, and the assembly code fails to set the symbol type. */
2673 && h
->type
== STT_NOTYPE
2675 (*_bfd_error_handler
)
2676 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2677 h
->root
.root
.string
);
2679 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2680 bed
= get_elf_backend_data (dynobj
);
2682 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2691 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2695 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry
*h
,
2698 unsigned int power_of_two
;
2700 asection
*sec
= h
->root
.u
.def
.section
;
2702 /* The section aligment of definition is the maximum alignment
2703 requirement of symbols defined in the section. Since we don't
2704 know the symbol alignment requirement, we start with the
2705 maximum alignment and check low bits of the symbol address
2706 for the minimum alignment. */
2707 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2708 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2709 while ((h
->root
.u
.def
.value
& mask
) != 0)
2715 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2718 /* Adjust the section alignment if needed. */
2719 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2724 /* We make sure that the symbol will be aligned properly. */
2725 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2727 /* Define the symbol as being at this point in DYNBSS. */
2728 h
->root
.u
.def
.section
= dynbss
;
2729 h
->root
.u
.def
.value
= dynbss
->size
;
2731 /* Increment the size of DYNBSS to make room for the symbol. */
2732 dynbss
->size
+= h
->size
;
2737 /* Adjust all external symbols pointing into SEC_MERGE sections
2738 to reflect the object merging within the sections. */
2741 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2745 if (h
->root
.type
== bfd_link_hash_warning
)
2746 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2748 if ((h
->root
.type
== bfd_link_hash_defined
2749 || h
->root
.type
== bfd_link_hash_defweak
)
2750 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2751 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2753 bfd
*output_bfd
= (bfd
*) data
;
2755 h
->root
.u
.def
.value
=
2756 _bfd_merged_section_offset (output_bfd
,
2757 &h
->root
.u
.def
.section
,
2758 elf_section_data (sec
)->sec_info
,
2759 h
->root
.u
.def
.value
);
2765 /* Returns false if the symbol referred to by H should be considered
2766 to resolve local to the current module, and true if it should be
2767 considered to bind dynamically. */
2770 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2771 struct bfd_link_info
*info
,
2772 bfd_boolean ignore_protected
)
2774 bfd_boolean binding_stays_local_p
;
2775 const struct elf_backend_data
*bed
;
2776 struct elf_link_hash_table
*hash_table
;
2781 while (h
->root
.type
== bfd_link_hash_indirect
2782 || h
->root
.type
== bfd_link_hash_warning
)
2783 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2785 /* If it was forced local, then clearly it's not dynamic. */
2786 if (h
->dynindx
== -1)
2788 if (h
->forced_local
)
2791 /* Identify the cases where name binding rules say that a
2792 visible symbol resolves locally. */
2793 binding_stays_local_p
= info
->executable
|| SYMBOLIC_BIND (info
, h
);
2795 switch (ELF_ST_VISIBILITY (h
->other
))
2802 hash_table
= elf_hash_table (info
);
2803 if (!is_elf_hash_table (hash_table
))
2806 bed
= get_elf_backend_data (hash_table
->dynobj
);
2808 /* Proper resolution for function pointer equality may require
2809 that these symbols perhaps be resolved dynamically, even though
2810 we should be resolving them to the current module. */
2811 if (!ignore_protected
|| !bed
->is_function_type (h
->type
))
2812 binding_stays_local_p
= TRUE
;
2819 /* If it isn't defined locally, then clearly it's dynamic. */
2820 if (!h
->def_regular
)
2823 /* Otherwise, the symbol is dynamic if binding rules don't tell
2824 us that it remains local. */
2825 return !binding_stays_local_p
;
2828 /* Return true if the symbol referred to by H should be considered
2829 to resolve local to the current module, and false otherwise. Differs
2830 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2831 undefined symbols and weak symbols. */
2834 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2835 struct bfd_link_info
*info
,
2836 bfd_boolean local_protected
)
2838 const struct elf_backend_data
*bed
;
2839 struct elf_link_hash_table
*hash_table
;
2841 /* If it's a local sym, of course we resolve locally. */
2845 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2846 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
2847 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
2850 /* Common symbols that become definitions don't get the DEF_REGULAR
2851 flag set, so test it first, and don't bail out. */
2852 if (ELF_COMMON_DEF_P (h
))
2854 /* If we don't have a definition in a regular file, then we can't
2855 resolve locally. The sym is either undefined or dynamic. */
2856 else if (!h
->def_regular
)
2859 /* Forced local symbols resolve locally. */
2860 if (h
->forced_local
)
2863 /* As do non-dynamic symbols. */
2864 if (h
->dynindx
== -1)
2867 /* At this point, we know the symbol is defined and dynamic. In an
2868 executable it must resolve locally, likewise when building symbolic
2869 shared libraries. */
2870 if (info
->executable
|| SYMBOLIC_BIND (info
, h
))
2873 /* Now deal with defined dynamic symbols in shared libraries. Ones
2874 with default visibility might not resolve locally. */
2875 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2878 hash_table
= elf_hash_table (info
);
2879 if (!is_elf_hash_table (hash_table
))
2882 bed
= get_elf_backend_data (hash_table
->dynobj
);
2884 /* STV_PROTECTED non-function symbols are local. */
2885 if (!bed
->is_function_type (h
->type
))
2888 /* Function pointer equality tests may require that STV_PROTECTED
2889 symbols be treated as dynamic symbols, even when we know that the
2890 dynamic linker will resolve them locally. */
2891 return local_protected
;
2894 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2895 aligned. Returns the first TLS output section. */
2897 struct bfd_section
*
2898 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2900 struct bfd_section
*sec
, *tls
;
2901 unsigned int align
= 0;
2903 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2904 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2908 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2909 if (sec
->alignment_power
> align
)
2910 align
= sec
->alignment_power
;
2912 elf_hash_table (info
)->tls_sec
= tls
;
2914 /* Ensure the alignment of the first section is the largest alignment,
2915 so that the tls segment starts aligned. */
2917 tls
->alignment_power
= align
;
2922 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2924 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2925 Elf_Internal_Sym
*sym
)
2927 const struct elf_backend_data
*bed
;
2929 /* Local symbols do not count, but target specific ones might. */
2930 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2931 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2934 bed
= get_elf_backend_data (abfd
);
2935 /* Function symbols do not count. */
2936 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
2939 /* If the section is undefined, then so is the symbol. */
2940 if (sym
->st_shndx
== SHN_UNDEF
)
2943 /* If the symbol is defined in the common section, then
2944 it is a common definition and so does not count. */
2945 if (bed
->common_definition (sym
))
2948 /* If the symbol is in a target specific section then we
2949 must rely upon the backend to tell us what it is. */
2950 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2951 /* FIXME - this function is not coded yet:
2953 return _bfd_is_global_symbol_definition (abfd, sym);
2955 Instead for now assume that the definition is not global,
2956 Even if this is wrong, at least the linker will behave
2957 in the same way that it used to do. */
2963 /* Search the symbol table of the archive element of the archive ABFD
2964 whose archive map contains a mention of SYMDEF, and determine if
2965 the symbol is defined in this element. */
2967 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2969 Elf_Internal_Shdr
* hdr
;
2970 bfd_size_type symcount
;
2971 bfd_size_type extsymcount
;
2972 bfd_size_type extsymoff
;
2973 Elf_Internal_Sym
*isymbuf
;
2974 Elf_Internal_Sym
*isym
;
2975 Elf_Internal_Sym
*isymend
;
2978 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2982 if (! bfd_check_format (abfd
, bfd_object
))
2985 /* If we have already included the element containing this symbol in the
2986 link then we do not need to include it again. Just claim that any symbol
2987 it contains is not a definition, so that our caller will not decide to
2988 (re)include this element. */
2989 if (abfd
->archive_pass
)
2992 /* Select the appropriate symbol table. */
2993 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2994 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2996 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2998 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3000 /* The sh_info field of the symtab header tells us where the
3001 external symbols start. We don't care about the local symbols. */
3002 if (elf_bad_symtab (abfd
))
3004 extsymcount
= symcount
;
3009 extsymcount
= symcount
- hdr
->sh_info
;
3010 extsymoff
= hdr
->sh_info
;
3013 if (extsymcount
== 0)
3016 /* Read in the symbol table. */
3017 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3019 if (isymbuf
== NULL
)
3022 /* Scan the symbol table looking for SYMDEF. */
3024 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3028 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3033 if (strcmp (name
, symdef
->name
) == 0)
3035 result
= is_global_data_symbol_definition (abfd
, isym
);
3045 /* Add an entry to the .dynamic table. */
3048 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3052 struct elf_link_hash_table
*hash_table
;
3053 const struct elf_backend_data
*bed
;
3055 bfd_size_type newsize
;
3056 bfd_byte
*newcontents
;
3057 Elf_Internal_Dyn dyn
;
3059 hash_table
= elf_hash_table (info
);
3060 if (! is_elf_hash_table (hash_table
))
3063 bed
= get_elf_backend_data (hash_table
->dynobj
);
3064 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3065 BFD_ASSERT (s
!= NULL
);
3067 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3068 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3069 if (newcontents
== NULL
)
3073 dyn
.d_un
.d_val
= val
;
3074 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3077 s
->contents
= newcontents
;
3082 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3083 otherwise just check whether one already exists. Returns -1 on error,
3084 1 if a DT_NEEDED tag already exists, and 0 on success. */
3087 elf_add_dt_needed_tag (bfd
*abfd
,
3088 struct bfd_link_info
*info
,
3092 struct elf_link_hash_table
*hash_table
;
3093 bfd_size_type oldsize
;
3094 bfd_size_type strindex
;
3096 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3099 hash_table
= elf_hash_table (info
);
3100 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
3101 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3102 if (strindex
== (bfd_size_type
) -1)
3105 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
3108 const struct elf_backend_data
*bed
;
3111 bed
= get_elf_backend_data (hash_table
->dynobj
);
3112 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3114 for (extdyn
= sdyn
->contents
;
3115 extdyn
< sdyn
->contents
+ sdyn
->size
;
3116 extdyn
+= bed
->s
->sizeof_dyn
)
3118 Elf_Internal_Dyn dyn
;
3120 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3121 if (dyn
.d_tag
== DT_NEEDED
3122 && dyn
.d_un
.d_val
== strindex
)
3124 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3132 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3135 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3139 /* We were just checking for existence of the tag. */
3140 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3146 on_needed_list (const char *soname
, struct bfd_link_needed_list
*needed
)
3148 for (; needed
!= NULL
; needed
= needed
->next
)
3149 if (strcmp (soname
, needed
->name
) == 0)
3155 /* Sort symbol by value and section. */
3157 elf_sort_symbol (const void *arg1
, const void *arg2
)
3159 const struct elf_link_hash_entry
*h1
;
3160 const struct elf_link_hash_entry
*h2
;
3161 bfd_signed_vma vdiff
;
3163 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3164 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3165 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3167 return vdiff
> 0 ? 1 : -1;
3170 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3172 return sdiff
> 0 ? 1 : -1;
3177 /* This function is used to adjust offsets into .dynstr for
3178 dynamic symbols. This is called via elf_link_hash_traverse. */
3181 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3183 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3185 if (h
->root
.type
== bfd_link_hash_warning
)
3186 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3188 if (h
->dynindx
!= -1)
3189 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3193 /* Assign string offsets in .dynstr, update all structures referencing
3197 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3199 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3200 struct elf_link_local_dynamic_entry
*entry
;
3201 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3202 bfd
*dynobj
= hash_table
->dynobj
;
3205 const struct elf_backend_data
*bed
;
3208 _bfd_elf_strtab_finalize (dynstr
);
3209 size
= _bfd_elf_strtab_size (dynstr
);
3211 bed
= get_elf_backend_data (dynobj
);
3212 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3213 BFD_ASSERT (sdyn
!= NULL
);
3215 /* Update all .dynamic entries referencing .dynstr strings. */
3216 for (extdyn
= sdyn
->contents
;
3217 extdyn
< sdyn
->contents
+ sdyn
->size
;
3218 extdyn
+= bed
->s
->sizeof_dyn
)
3220 Elf_Internal_Dyn dyn
;
3222 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3226 dyn
.d_un
.d_val
= size
;
3236 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3241 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3244 /* Now update local dynamic symbols. */
3245 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3246 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3247 entry
->isym
.st_name
);
3249 /* And the rest of dynamic symbols. */
3250 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3252 /* Adjust version definitions. */
3253 if (elf_tdata (output_bfd
)->cverdefs
)
3258 Elf_Internal_Verdef def
;
3259 Elf_Internal_Verdaux defaux
;
3261 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3265 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3267 p
+= sizeof (Elf_External_Verdef
);
3268 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3270 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3272 _bfd_elf_swap_verdaux_in (output_bfd
,
3273 (Elf_External_Verdaux
*) p
, &defaux
);
3274 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3276 _bfd_elf_swap_verdaux_out (output_bfd
,
3277 &defaux
, (Elf_External_Verdaux
*) p
);
3278 p
+= sizeof (Elf_External_Verdaux
);
3281 while (def
.vd_next
);
3284 /* Adjust version references. */
3285 if (elf_tdata (output_bfd
)->verref
)
3290 Elf_Internal_Verneed need
;
3291 Elf_Internal_Vernaux needaux
;
3293 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3297 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3299 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3300 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3301 (Elf_External_Verneed
*) p
);
3302 p
+= sizeof (Elf_External_Verneed
);
3303 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3305 _bfd_elf_swap_vernaux_in (output_bfd
,
3306 (Elf_External_Vernaux
*) p
, &needaux
);
3307 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3309 _bfd_elf_swap_vernaux_out (output_bfd
,
3311 (Elf_External_Vernaux
*) p
);
3312 p
+= sizeof (Elf_External_Vernaux
);
3315 while (need
.vn_next
);
3321 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3322 The default is to only match when the INPUT and OUTPUT are exactly
3326 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3327 const bfd_target
*output
)
3329 return input
== output
;
3332 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3333 This version is used when different targets for the same architecture
3334 are virtually identical. */
3337 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3338 const bfd_target
*output
)
3340 const struct elf_backend_data
*obed
, *ibed
;
3342 if (input
== output
)
3345 ibed
= xvec_get_elf_backend_data (input
);
3346 obed
= xvec_get_elf_backend_data (output
);
3348 if (ibed
->arch
!= obed
->arch
)
3351 /* If both backends are using this function, deem them compatible. */
3352 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3355 /* Add symbols from an ELF object file to the linker hash table. */
3358 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3360 Elf_Internal_Ehdr
*ehdr
;
3361 Elf_Internal_Shdr
*hdr
;
3362 bfd_size_type symcount
;
3363 bfd_size_type extsymcount
;
3364 bfd_size_type extsymoff
;
3365 struct elf_link_hash_entry
**sym_hash
;
3366 bfd_boolean dynamic
;
3367 Elf_External_Versym
*extversym
= NULL
;
3368 Elf_External_Versym
*ever
;
3369 struct elf_link_hash_entry
*weaks
;
3370 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3371 bfd_size_type nondeflt_vers_cnt
= 0;
3372 Elf_Internal_Sym
*isymbuf
= NULL
;
3373 Elf_Internal_Sym
*isym
;
3374 Elf_Internal_Sym
*isymend
;
3375 const struct elf_backend_data
*bed
;
3376 bfd_boolean add_needed
;
3377 struct elf_link_hash_table
*htab
;
3379 void *alloc_mark
= NULL
;
3380 struct bfd_hash_entry
**old_table
= NULL
;
3381 unsigned int old_size
= 0;
3382 unsigned int old_count
= 0;
3383 void *old_tab
= NULL
;
3386 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3387 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3388 long old_dynsymcount
= 0;
3390 size_t hashsize
= 0;
3392 htab
= elf_hash_table (info
);
3393 bed
= get_elf_backend_data (abfd
);
3395 if ((abfd
->flags
& DYNAMIC
) == 0)
3401 /* You can't use -r against a dynamic object. Also, there's no
3402 hope of using a dynamic object which does not exactly match
3403 the format of the output file. */
3404 if (info
->relocatable
3405 || !is_elf_hash_table (htab
)
3406 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3408 if (info
->relocatable
)
3409 bfd_set_error (bfd_error_invalid_operation
);
3411 bfd_set_error (bfd_error_wrong_format
);
3416 ehdr
= elf_elfheader (abfd
);
3417 if (info
->warn_alternate_em
3418 && bed
->elf_machine_code
!= ehdr
->e_machine
3419 && ((bed
->elf_machine_alt1
!= 0
3420 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3421 || (bed
->elf_machine_alt2
!= 0
3422 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3423 info
->callbacks
->einfo
3424 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3425 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3427 /* As a GNU extension, any input sections which are named
3428 .gnu.warning.SYMBOL are treated as warning symbols for the given
3429 symbol. This differs from .gnu.warning sections, which generate
3430 warnings when they are included in an output file. */
3431 if (info
->executable
)
3435 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3439 name
= bfd_get_section_name (abfd
, s
);
3440 if (CONST_STRNEQ (name
, ".gnu.warning."))
3445 name
+= sizeof ".gnu.warning." - 1;
3447 /* If this is a shared object, then look up the symbol
3448 in the hash table. If it is there, and it is already
3449 been defined, then we will not be using the entry
3450 from this shared object, so we don't need to warn.
3451 FIXME: If we see the definition in a regular object
3452 later on, we will warn, but we shouldn't. The only
3453 fix is to keep track of what warnings we are supposed
3454 to emit, and then handle them all at the end of the
3458 struct elf_link_hash_entry
*h
;
3460 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3462 /* FIXME: What about bfd_link_hash_common? */
3464 && (h
->root
.type
== bfd_link_hash_defined
3465 || h
->root
.type
== bfd_link_hash_defweak
))
3467 /* We don't want to issue this warning. Clobber
3468 the section size so that the warning does not
3469 get copied into the output file. */
3476 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
3480 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3485 if (! (_bfd_generic_link_add_one_symbol
3486 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3487 FALSE
, bed
->collect
, NULL
)))
3490 if (! info
->relocatable
)
3492 /* Clobber the section size so that the warning does
3493 not get copied into the output file. */
3496 /* Also set SEC_EXCLUDE, so that symbols defined in
3497 the warning section don't get copied to the output. */
3498 s
->flags
|= SEC_EXCLUDE
;
3507 /* If we are creating a shared library, create all the dynamic
3508 sections immediately. We need to attach them to something,
3509 so we attach them to this BFD, provided it is the right
3510 format. FIXME: If there are no input BFD's of the same
3511 format as the output, we can't make a shared library. */
3513 && is_elf_hash_table (htab
)
3514 && info
->output_bfd
->xvec
== abfd
->xvec
3515 && !htab
->dynamic_sections_created
)
3517 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3521 else if (!is_elf_hash_table (htab
))
3526 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
))
3563 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3564 if (elfsec
== SHN_BAD
)
3565 goto error_free_dyn
;
3566 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3568 for (extdyn
= dynbuf
;
3569 extdyn
< dynbuf
+ s
->size
;
3570 extdyn
+= bed
->s
->sizeof_dyn
)
3572 Elf_Internal_Dyn dyn
;
3574 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3575 if (dyn
.d_tag
== DT_SONAME
)
3577 unsigned int tagv
= dyn
.d_un
.d_val
;
3578 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3580 goto error_free_dyn
;
3582 if (dyn
.d_tag
== DT_NEEDED
)
3584 struct bfd_link_needed_list
*n
, **pn
;
3586 unsigned int tagv
= dyn
.d_un
.d_val
;
3588 amt
= sizeof (struct bfd_link_needed_list
);
3589 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3590 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3591 if (n
== NULL
|| fnm
== NULL
)
3592 goto error_free_dyn
;
3593 amt
= strlen (fnm
) + 1;
3594 anm
= (char *) bfd_alloc (abfd
, amt
);
3596 goto error_free_dyn
;
3597 memcpy (anm
, fnm
, amt
);
3601 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3605 if (dyn
.d_tag
== DT_RUNPATH
)
3607 struct bfd_link_needed_list
*n
, **pn
;
3609 unsigned int tagv
= dyn
.d_un
.d_val
;
3611 amt
= sizeof (struct bfd_link_needed_list
);
3612 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3613 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3614 if (n
== NULL
|| fnm
== NULL
)
3615 goto error_free_dyn
;
3616 amt
= strlen (fnm
) + 1;
3617 anm
= (char *) bfd_alloc (abfd
, amt
);
3619 goto error_free_dyn
;
3620 memcpy (anm
, fnm
, amt
);
3624 for (pn
= & runpath
;
3630 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3631 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3633 struct bfd_link_needed_list
*n
, **pn
;
3635 unsigned int tagv
= dyn
.d_un
.d_val
;
3637 amt
= sizeof (struct bfd_link_needed_list
);
3638 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3639 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3640 if (n
== NULL
|| fnm
== NULL
)
3641 goto error_free_dyn
;
3642 amt
= strlen (fnm
) + 1;
3643 anm
= (char *) bfd_alloc (abfd
, amt
);
3645 goto error_free_dyn
;
3646 memcpy (anm
, fnm
, amt
);
3656 if (dyn
.d_tag
== DT_AUDIT
)
3658 unsigned int tagv
= dyn
.d_un
.d_val
;
3659 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3666 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3667 frees all more recently bfd_alloc'd blocks as well. */
3673 struct bfd_link_needed_list
**pn
;
3674 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3679 /* We do not want to include any of the sections in a dynamic
3680 object in the output file. We hack by simply clobbering the
3681 list of sections in the BFD. This could be handled more
3682 cleanly by, say, a new section flag; the existing
3683 SEC_NEVER_LOAD flag is not the one we want, because that one
3684 still implies that the section takes up space in the output
3686 bfd_section_list_clear (abfd
);
3688 /* Find the name to use in a DT_NEEDED entry that refers to this
3689 object. If the object has a DT_SONAME entry, we use it.
3690 Otherwise, if the generic linker stuck something in
3691 elf_dt_name, we use that. Otherwise, we just use the file
3693 if (soname
== NULL
|| *soname
== '\0')
3695 soname
= elf_dt_name (abfd
);
3696 if (soname
== NULL
|| *soname
== '\0')
3697 soname
= bfd_get_filename (abfd
);
3700 /* Save the SONAME because sometimes the linker emulation code
3701 will need to know it. */
3702 elf_dt_name (abfd
) = soname
;
3704 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3708 /* If we have already included this dynamic object in the
3709 link, just ignore it. There is no reason to include a
3710 particular dynamic object more than once. */
3714 /* Save the DT_AUDIT entry for the linker emulation code. */
3715 elf_dt_audit (abfd
) = audit
;
3718 /* If this is a dynamic object, we always link against the .dynsym
3719 symbol table, not the .symtab symbol table. The dynamic linker
3720 will only see the .dynsym symbol table, so there is no reason to
3721 look at .symtab for a dynamic object. */
3723 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3724 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3726 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3728 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3730 /* The sh_info field of the symtab header tells us where the
3731 external symbols start. We don't care about the local symbols at
3733 if (elf_bad_symtab (abfd
))
3735 extsymcount
= symcount
;
3740 extsymcount
= symcount
- hdr
->sh_info
;
3741 extsymoff
= hdr
->sh_info
;
3745 if (extsymcount
!= 0)
3747 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3749 if (isymbuf
== NULL
)
3752 /* We store a pointer to the hash table entry for each external
3754 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3755 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
3756 if (sym_hash
== NULL
)
3757 goto error_free_sym
;
3758 elf_sym_hashes (abfd
) = sym_hash
;
3763 /* Read in any version definitions. */
3764 if (!_bfd_elf_slurp_version_tables (abfd
,
3765 info
->default_imported_symver
))
3766 goto error_free_sym
;
3768 /* Read in the symbol versions, but don't bother to convert them
3769 to internal format. */
3770 if (elf_dynversym (abfd
) != 0)
3772 Elf_Internal_Shdr
*versymhdr
;
3774 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3775 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
3776 if (extversym
== NULL
)
3777 goto error_free_sym
;
3778 amt
= versymhdr
->sh_size
;
3779 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3780 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3781 goto error_free_vers
;
3785 /* If we are loading an as-needed shared lib, save the symbol table
3786 state before we start adding symbols. If the lib turns out
3787 to be unneeded, restore the state. */
3788 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
3793 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
3795 struct bfd_hash_entry
*p
;
3796 struct elf_link_hash_entry
*h
;
3798 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3800 h
= (struct elf_link_hash_entry
*) p
;
3801 entsize
+= htab
->root
.table
.entsize
;
3802 if (h
->root
.type
== bfd_link_hash_warning
)
3803 entsize
+= htab
->root
.table
.entsize
;
3807 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
3808 hashsize
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3809 old_tab
= bfd_malloc (tabsize
+ entsize
+ hashsize
);
3810 if (old_tab
== NULL
)
3811 goto error_free_vers
;
3813 /* Remember the current objalloc pointer, so that all mem for
3814 symbols added can later be reclaimed. */
3815 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
3816 if (alloc_mark
== NULL
)
3817 goto error_free_vers
;
3819 /* Make a special call to the linker "notice" function to
3820 tell it that we are about to handle an as-needed lib. */
3821 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
3823 goto error_free_vers
;
3825 /* Clone the symbol table and sym hashes. Remember some
3826 pointers into the symbol table, and dynamic symbol count. */
3827 old_hash
= (char *) old_tab
+ tabsize
;
3828 old_ent
= (char *) old_hash
+ hashsize
;
3829 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
3830 memcpy (old_hash
, sym_hash
, hashsize
);
3831 old_undefs
= htab
->root
.undefs
;
3832 old_undefs_tail
= htab
->root
.undefs_tail
;
3833 old_table
= htab
->root
.table
.table
;
3834 old_size
= htab
->root
.table
.size
;
3835 old_count
= htab
->root
.table
.count
;
3836 old_dynsymcount
= htab
->dynsymcount
;
3838 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
3840 struct bfd_hash_entry
*p
;
3841 struct elf_link_hash_entry
*h
;
3843 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3845 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
3846 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3847 h
= (struct elf_link_hash_entry
*) p
;
3848 if (h
->root
.type
== bfd_link_hash_warning
)
3850 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
3851 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3858 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3859 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3861 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3865 asection
*sec
, *new_sec
;
3868 struct elf_link_hash_entry
*h
;
3869 bfd_boolean definition
;
3870 bfd_boolean size_change_ok
;
3871 bfd_boolean type_change_ok
;
3872 bfd_boolean new_weakdef
;
3873 bfd_boolean override
;
3875 unsigned int old_alignment
;
3877 bfd
* undef_bfd
= NULL
;
3881 flags
= BSF_NO_FLAGS
;
3883 value
= isym
->st_value
;
3885 common
= bed
->common_definition (isym
);
3887 bind
= ELF_ST_BIND (isym
->st_info
);
3891 /* This should be impossible, since ELF requires that all
3892 global symbols follow all local symbols, and that sh_info
3893 point to the first global symbol. Unfortunately, Irix 5
3898 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
3906 case STB_GNU_UNIQUE
:
3907 flags
= BSF_GNU_UNIQUE
;
3911 /* Leave it up to the processor backend. */
3915 if (isym
->st_shndx
== SHN_UNDEF
)
3916 sec
= bfd_und_section_ptr
;
3917 else if (isym
->st_shndx
== SHN_ABS
)
3918 sec
= bfd_abs_section_ptr
;
3919 else if (isym
->st_shndx
== SHN_COMMON
)
3921 sec
= bfd_com_section_ptr
;
3922 /* What ELF calls the size we call the value. What ELF
3923 calls the value we call the alignment. */
3924 value
= isym
->st_size
;
3928 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3930 sec
= bfd_abs_section_ptr
;
3931 else if (sec
->kept_section
)
3933 /* Symbols from discarded section are undefined. We keep
3935 sec
= bfd_und_section_ptr
;
3936 isym
->st_shndx
= SHN_UNDEF
;
3938 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3942 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3945 goto error_free_vers
;
3947 if (isym
->st_shndx
== SHN_COMMON
3948 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
3949 && !info
->relocatable
)
3951 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3955 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon",
3958 | SEC_LINKER_CREATED
3959 | SEC_THREAD_LOCAL
));
3961 goto error_free_vers
;
3965 else if (bed
->elf_add_symbol_hook
)
3967 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
3969 goto error_free_vers
;
3971 /* The hook function sets the name to NULL if this symbol
3972 should be skipped for some reason. */
3977 /* Sanity check that all possibilities were handled. */
3980 bfd_set_error (bfd_error_bad_value
);
3981 goto error_free_vers
;
3984 if (bfd_is_und_section (sec
)
3985 || bfd_is_com_section (sec
))
3990 size_change_ok
= FALSE
;
3991 type_change_ok
= bed
->type_change_ok
;
3996 if (is_elf_hash_table (htab
))
3998 Elf_Internal_Versym iver
;
3999 unsigned int vernum
= 0;
4002 /* If this is a definition of a symbol which was previously
4003 referenced in a non-weak manner then make a note of the bfd
4004 that contained the reference. This is used if we need to
4005 refer to the source of the reference later on. */
4006 if (! bfd_is_und_section (sec
))
4008 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4011 && h
->root
.type
== bfd_link_hash_undefined
4012 && h
->root
.u
.undef
.abfd
)
4013 undef_bfd
= h
->root
.u
.undef
.abfd
;
4018 if (info
->default_imported_symver
)
4019 /* Use the default symbol version created earlier. */
4020 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4025 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4027 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4029 /* If this is a hidden symbol, or if it is not version
4030 1, we append the version name to the symbol name.
4031 However, we do not modify a non-hidden absolute symbol
4032 if it is not a function, because it might be the version
4033 symbol itself. FIXME: What if it isn't? */
4034 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4036 && (!bfd_is_abs_section (sec
)
4037 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4040 size_t namelen
, verlen
, newlen
;
4043 if (isym
->st_shndx
!= SHN_UNDEF
)
4045 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4047 else if (vernum
> 1)
4049 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4055 (*_bfd_error_handler
)
4056 (_("%B: %s: invalid version %u (max %d)"),
4058 elf_tdata (abfd
)->cverdefs
);
4059 bfd_set_error (bfd_error_bad_value
);
4060 goto error_free_vers
;
4065 /* We cannot simply test for the number of
4066 entries in the VERNEED section since the
4067 numbers for the needed versions do not start
4069 Elf_Internal_Verneed
*t
;
4072 for (t
= elf_tdata (abfd
)->verref
;
4076 Elf_Internal_Vernaux
*a
;
4078 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4080 if (a
->vna_other
== vernum
)
4082 verstr
= a
->vna_nodename
;
4091 (*_bfd_error_handler
)
4092 (_("%B: %s: invalid needed version %d"),
4093 abfd
, name
, vernum
);
4094 bfd_set_error (bfd_error_bad_value
);
4095 goto error_free_vers
;
4099 namelen
= strlen (name
);
4100 verlen
= strlen (verstr
);
4101 newlen
= namelen
+ verlen
+ 2;
4102 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4103 && isym
->st_shndx
!= SHN_UNDEF
)
4106 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4107 if (newname
== NULL
)
4108 goto error_free_vers
;
4109 memcpy (newname
, name
, namelen
);
4110 p
= newname
+ namelen
;
4112 /* If this is a defined non-hidden version symbol,
4113 we add another @ to the name. This indicates the
4114 default version of the symbol. */
4115 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4116 && isym
->st_shndx
!= SHN_UNDEF
)
4118 memcpy (p
, verstr
, verlen
+ 1);
4123 /* If necessary, make a second attempt to locate the bfd
4124 containing an unresolved, non-weak reference to the
4126 if (! bfd_is_und_section (sec
) && undef_bfd
== NULL
)
4128 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4131 && h
->root
.type
== bfd_link_hash_undefined
4132 && h
->root
.u
.undef
.abfd
)
4133 undef_bfd
= h
->root
.u
.undef
.abfd
;
4136 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
,
4137 &value
, &old_alignment
,
4138 sym_hash
, &skip
, &override
,
4139 &type_change_ok
, &size_change_ok
))
4140 goto error_free_vers
;
4149 while (h
->root
.type
== bfd_link_hash_indirect
4150 || h
->root
.type
== bfd_link_hash_warning
)
4151 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4153 /* Remember the old alignment if this is a common symbol, so
4154 that we don't reduce the alignment later on. We can't
4155 check later, because _bfd_generic_link_add_one_symbol
4156 will set a default for the alignment which we want to
4157 override. We also remember the old bfd where the existing
4158 definition comes from. */
4159 switch (h
->root
.type
)
4164 case bfd_link_hash_defined
:
4165 case bfd_link_hash_defweak
:
4166 old_bfd
= h
->root
.u
.def
.section
->owner
;
4169 case bfd_link_hash_common
:
4170 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
4171 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
4175 if (elf_tdata (abfd
)->verdef
!= NULL
4179 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4182 if (! (_bfd_generic_link_add_one_symbol
4183 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4184 (struct bfd_link_hash_entry
**) sym_hash
)))
4185 goto error_free_vers
;
4188 while (h
->root
.type
== bfd_link_hash_indirect
4189 || h
->root
.type
== bfd_link_hash_warning
)
4190 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4193 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
4195 new_weakdef
= FALSE
;
4198 && (flags
& BSF_WEAK
) != 0
4199 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4200 && is_elf_hash_table (htab
)
4201 && h
->u
.weakdef
== NULL
)
4203 /* Keep a list of all weak defined non function symbols from
4204 a dynamic object, using the weakdef field. Later in this
4205 function we will set the weakdef field to the correct
4206 value. We only put non-function symbols from dynamic
4207 objects on this list, because that happens to be the only
4208 time we need to know the normal symbol corresponding to a
4209 weak symbol, and the information is time consuming to
4210 figure out. If the weakdef field is not already NULL,
4211 then this symbol was already defined by some previous
4212 dynamic object, and we will be using that previous
4213 definition anyhow. */
4215 h
->u
.weakdef
= weaks
;
4220 /* Set the alignment of a common symbol. */
4221 if ((common
|| bfd_is_com_section (sec
))
4222 && h
->root
.type
== bfd_link_hash_common
)
4227 align
= bfd_log2 (isym
->st_value
);
4230 /* The new symbol is a common symbol in a shared object.
4231 We need to get the alignment from the section. */
4232 align
= new_sec
->alignment_power
;
4234 if (align
> old_alignment
4235 /* Permit an alignment power of zero if an alignment of one
4236 is specified and no other alignments have been specified. */
4237 || (isym
->st_value
== 1 && old_alignment
== 0))
4238 h
->root
.u
.c
.p
->alignment_power
= align
;
4240 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4243 if (is_elf_hash_table (htab
))
4247 /* Check the alignment when a common symbol is involved. This
4248 can change when a common symbol is overridden by a normal
4249 definition or a common symbol is ignored due to the old
4250 normal definition. We need to make sure the maximum
4251 alignment is maintained. */
4252 if ((old_alignment
|| common
)
4253 && h
->root
.type
!= bfd_link_hash_common
)
4255 unsigned int common_align
;
4256 unsigned int normal_align
;
4257 unsigned int symbol_align
;
4261 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4262 if (h
->root
.u
.def
.section
->owner
!= NULL
4263 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
4265 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4266 if (normal_align
> symbol_align
)
4267 normal_align
= symbol_align
;
4270 normal_align
= symbol_align
;
4274 common_align
= old_alignment
;
4275 common_bfd
= old_bfd
;
4280 common_align
= bfd_log2 (isym
->st_value
);
4282 normal_bfd
= old_bfd
;
4285 if (normal_align
< common_align
)
4287 /* PR binutils/2735 */
4288 if (normal_bfd
== NULL
)
4289 (*_bfd_error_handler
)
4290 (_("Warning: alignment %u of common symbol `%s' in %B"
4291 " is greater than the alignment (%u) of its section %A"),
4292 common_bfd
, h
->root
.u
.def
.section
,
4293 1 << common_align
, name
, 1 << normal_align
);
4295 (*_bfd_error_handler
)
4296 (_("Warning: alignment %u of symbol `%s' in %B"
4297 " is smaller than %u in %B"),
4298 normal_bfd
, common_bfd
,
4299 1 << normal_align
, name
, 1 << common_align
);
4303 /* Remember the symbol size if it isn't undefined. */
4304 if ((isym
->st_size
!= 0 && isym
->st_shndx
!= SHN_UNDEF
)
4305 && (definition
|| h
->size
== 0))
4308 && h
->size
!= isym
->st_size
4309 && ! size_change_ok
)
4310 (*_bfd_error_handler
)
4311 (_("Warning: size of symbol `%s' changed"
4312 " from %lu in %B to %lu in %B"),
4314 name
, (unsigned long) h
->size
,
4315 (unsigned long) isym
->st_size
);
4317 h
->size
= isym
->st_size
;
4320 /* If this is a common symbol, then we always want H->SIZE
4321 to be the size of the common symbol. The code just above
4322 won't fix the size if a common symbol becomes larger. We
4323 don't warn about a size change here, because that is
4324 covered by --warn-common. Allow changed between different
4326 if (h
->root
.type
== bfd_link_hash_common
)
4327 h
->size
= h
->root
.u
.c
.size
;
4329 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4330 && (definition
|| h
->type
== STT_NOTYPE
))
4332 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
4334 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4336 if (type
== STT_GNU_IFUNC
4337 && (abfd
->flags
& DYNAMIC
) != 0)
4340 if (h
->type
!= type
)
4342 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
4343 (*_bfd_error_handler
)
4344 (_("Warning: type of symbol `%s' changed"
4345 " from %d to %d in %B"),
4346 abfd
, name
, h
->type
, type
);
4352 /* Merge st_other field. */
4353 elf_merge_st_other (abfd
, h
, isym
, definition
, dynamic
);
4355 /* Set a flag in the hash table entry indicating the type of
4356 reference or definition we just found. Keep a count of
4357 the number of dynamic symbols we find. A dynamic symbol
4358 is one which is referenced or defined by both a regular
4359 object and a shared object. */
4366 if (bind
!= STB_WEAK
)
4367 h
->ref_regular_nonweak
= 1;
4379 if (! info
->executable
4392 || (h
->u
.weakdef
!= NULL
4394 && h
->u
.weakdef
->dynindx
!= -1))
4398 if (definition
&& (sec
->flags
& SEC_DEBUGGING
) && !info
->relocatable
)
4400 /* We don't want to make debug symbol dynamic. */
4404 /* Check to see if we need to add an indirect symbol for
4405 the default name. */
4406 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
4407 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4408 &sec
, &value
, &dynsym
,
4410 goto error_free_vers
;
4412 if (definition
&& !dynamic
)
4414 char *p
= strchr (name
, ELF_VER_CHR
);
4415 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4417 /* Queue non-default versions so that .symver x, x@FOO
4418 aliases can be checked. */
4421 amt
= ((isymend
- isym
+ 1)
4422 * sizeof (struct elf_link_hash_entry
*));
4424 (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4426 goto error_free_vers
;
4428 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4432 if (dynsym
&& h
->dynindx
== -1)
4434 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4435 goto error_free_vers
;
4436 if (h
->u
.weakdef
!= NULL
4438 && h
->u
.weakdef
->dynindx
== -1)
4440 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4441 goto error_free_vers
;
4444 else if (dynsym
&& h
->dynindx
!= -1)
4445 /* If the symbol already has a dynamic index, but
4446 visibility says it should not be visible, turn it into
4448 switch (ELF_ST_VISIBILITY (h
->other
))
4452 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4462 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
4463 && !on_needed_list (elf_dt_name (abfd
), htab
->needed
))))
4466 const char *soname
= elf_dt_name (abfd
);
4468 /* A symbol from a library loaded via DT_NEEDED of some
4469 other library is referenced by a regular object.
4470 Add a DT_NEEDED entry for it. Issue an error if
4471 --no-add-needed is used and the reference was not
4473 if (undef_bfd
!= NULL
4474 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4476 (*_bfd_error_handler
)
4477 (_("%B: undefined reference to symbol '%s'"),
4479 (*_bfd_error_handler
)
4480 (_("note: '%s' is defined in DSO %B so try adding it to the linker command line"),
4482 bfd_set_error (bfd_error_invalid_operation
);
4483 goto error_free_vers
;
4486 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
4487 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
4490 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4492 goto error_free_vers
;
4494 BFD_ASSERT (ret
== 0);
4499 if (extversym
!= NULL
)
4505 if (isymbuf
!= NULL
)
4511 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4515 /* Restore the symbol table. */
4516 if (bed
->as_needed_cleanup
)
4517 (*bed
->as_needed_cleanup
) (abfd
, info
);
4518 old_hash
= (char *) old_tab
+ tabsize
;
4519 old_ent
= (char *) old_hash
+ hashsize
;
4520 sym_hash
= elf_sym_hashes (abfd
);
4521 htab
->root
.table
.table
= old_table
;
4522 htab
->root
.table
.size
= old_size
;
4523 htab
->root
.table
.count
= old_count
;
4524 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4525 memcpy (sym_hash
, old_hash
, hashsize
);
4526 htab
->root
.undefs
= old_undefs
;
4527 htab
->root
.undefs_tail
= old_undefs_tail
;
4528 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4530 struct bfd_hash_entry
*p
;
4531 struct elf_link_hash_entry
*h
;
4533 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4535 h
= (struct elf_link_hash_entry
*) p
;
4536 if (h
->root
.type
== bfd_link_hash_warning
)
4537 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4538 if (h
->dynindx
>= old_dynsymcount
)
4539 _bfd_elf_strtab_delref (htab
->dynstr
, h
->dynstr_index
);
4541 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4542 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4543 h
= (struct elf_link_hash_entry
*) p
;
4544 if (h
->root
.type
== bfd_link_hash_warning
)
4546 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4547 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4552 /* Make a special call to the linker "notice" function to
4553 tell it that symbols added for crefs may need to be removed. */
4554 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4556 goto error_free_vers
;
4559 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4561 if (nondeflt_vers
!= NULL
)
4562 free (nondeflt_vers
);
4566 if (old_tab
!= NULL
)
4568 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4570 goto error_free_vers
;
4575 /* Now that all the symbols from this input file are created, handle
4576 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4577 if (nondeflt_vers
!= NULL
)
4579 bfd_size_type cnt
, symidx
;
4581 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4583 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4584 char *shortname
, *p
;
4586 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4588 || (h
->root
.type
!= bfd_link_hash_defined
4589 && h
->root
.type
!= bfd_link_hash_defweak
))
4592 amt
= p
- h
->root
.root
.string
;
4593 shortname
= (char *) bfd_malloc (amt
+ 1);
4595 goto error_free_vers
;
4596 memcpy (shortname
, h
->root
.root
.string
, amt
);
4597 shortname
[amt
] = '\0';
4599 hi
= (struct elf_link_hash_entry
*)
4600 bfd_link_hash_lookup (&htab
->root
, shortname
,
4601 FALSE
, FALSE
, FALSE
);
4603 && hi
->root
.type
== h
->root
.type
4604 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4605 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4607 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4608 hi
->root
.type
= bfd_link_hash_indirect
;
4609 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4610 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4611 sym_hash
= elf_sym_hashes (abfd
);
4613 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4614 if (sym_hash
[symidx
] == hi
)
4616 sym_hash
[symidx
] = h
;
4622 free (nondeflt_vers
);
4623 nondeflt_vers
= NULL
;
4626 /* Now set the weakdefs field correctly for all the weak defined
4627 symbols we found. The only way to do this is to search all the
4628 symbols. Since we only need the information for non functions in
4629 dynamic objects, that's the only time we actually put anything on
4630 the list WEAKS. We need this information so that if a regular
4631 object refers to a symbol defined weakly in a dynamic object, the
4632 real symbol in the dynamic object is also put in the dynamic
4633 symbols; we also must arrange for both symbols to point to the
4634 same memory location. We could handle the general case of symbol
4635 aliasing, but a general symbol alias can only be generated in
4636 assembler code, handling it correctly would be very time
4637 consuming, and other ELF linkers don't handle general aliasing
4641 struct elf_link_hash_entry
**hpp
;
4642 struct elf_link_hash_entry
**hppend
;
4643 struct elf_link_hash_entry
**sorted_sym_hash
;
4644 struct elf_link_hash_entry
*h
;
4647 /* Since we have to search the whole symbol list for each weak
4648 defined symbol, search time for N weak defined symbols will be
4649 O(N^2). Binary search will cut it down to O(NlogN). */
4650 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4651 sorted_sym_hash
= (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4652 if (sorted_sym_hash
== NULL
)
4654 sym_hash
= sorted_sym_hash
;
4655 hpp
= elf_sym_hashes (abfd
);
4656 hppend
= hpp
+ extsymcount
;
4658 for (; hpp
< hppend
; hpp
++)
4662 && h
->root
.type
== bfd_link_hash_defined
4663 && !bed
->is_function_type (h
->type
))
4671 qsort (sorted_sym_hash
, sym_count
,
4672 sizeof (struct elf_link_hash_entry
*),
4675 while (weaks
!= NULL
)
4677 struct elf_link_hash_entry
*hlook
;
4684 weaks
= hlook
->u
.weakdef
;
4685 hlook
->u
.weakdef
= NULL
;
4687 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4688 || hlook
->root
.type
== bfd_link_hash_defweak
4689 || hlook
->root
.type
== bfd_link_hash_common
4690 || hlook
->root
.type
== bfd_link_hash_indirect
);
4691 slook
= hlook
->root
.u
.def
.section
;
4692 vlook
= hlook
->root
.u
.def
.value
;
4699 bfd_signed_vma vdiff
;
4701 h
= sorted_sym_hash
[idx
];
4702 vdiff
= vlook
- h
->root
.u
.def
.value
;
4709 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4722 /* We didn't find a value/section match. */
4726 for (i
= ilook
; i
< sym_count
; i
++)
4728 h
= sorted_sym_hash
[i
];
4730 /* Stop if value or section doesn't match. */
4731 if (h
->root
.u
.def
.value
!= vlook
4732 || h
->root
.u
.def
.section
!= slook
)
4734 else if (h
!= hlook
)
4736 hlook
->u
.weakdef
= h
;
4738 /* If the weak definition is in the list of dynamic
4739 symbols, make sure the real definition is put
4741 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4743 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4746 free (sorted_sym_hash
);
4751 /* If the real definition is in the list of dynamic
4752 symbols, make sure the weak definition is put
4753 there as well. If we don't do this, then the
4754 dynamic loader might not merge the entries for the
4755 real definition and the weak definition. */
4756 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4758 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4759 goto err_free_sym_hash
;
4766 free (sorted_sym_hash
);
4769 if (bed
->check_directives
4770 && !(*bed
->check_directives
) (abfd
, info
))
4773 /* If this object is the same format as the output object, and it is
4774 not a shared library, then let the backend look through the
4777 This is required to build global offset table entries and to
4778 arrange for dynamic relocs. It is not required for the
4779 particular common case of linking non PIC code, even when linking
4780 against shared libraries, but unfortunately there is no way of
4781 knowing whether an object file has been compiled PIC or not.
4782 Looking through the relocs is not particularly time consuming.
4783 The problem is that we must either (1) keep the relocs in memory,
4784 which causes the linker to require additional runtime memory or
4785 (2) read the relocs twice from the input file, which wastes time.
4786 This would be a good case for using mmap.
4788 I have no idea how to handle linking PIC code into a file of a
4789 different format. It probably can't be done. */
4791 && is_elf_hash_table (htab
)
4792 && bed
->check_relocs
!= NULL
4793 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4797 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4799 Elf_Internal_Rela
*internal_relocs
;
4802 if ((o
->flags
& SEC_RELOC
) == 0
4803 || o
->reloc_count
== 0
4804 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4805 && (o
->flags
& SEC_DEBUGGING
) != 0)
4806 || bfd_is_abs_section (o
->output_section
))
4809 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4811 if (internal_relocs
== NULL
)
4814 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4816 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4817 free (internal_relocs
);
4824 /* If this is a non-traditional link, try to optimize the handling
4825 of the .stab/.stabstr sections. */
4827 && ! info
->traditional_format
4828 && is_elf_hash_table (htab
)
4829 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4833 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4834 if (stabstr
!= NULL
)
4836 bfd_size_type string_offset
= 0;
4839 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4840 if (CONST_STRNEQ (stab
->name
, ".stab")
4841 && (!stab
->name
[5] ||
4842 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4843 && (stab
->flags
& SEC_MERGE
) == 0
4844 && !bfd_is_abs_section (stab
->output_section
))
4846 struct bfd_elf_section_data
*secdata
;
4848 secdata
= elf_section_data (stab
);
4849 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
4850 stabstr
, &secdata
->sec_info
,
4853 if (secdata
->sec_info
)
4854 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4859 if (is_elf_hash_table (htab
) && add_needed
)
4861 /* Add this bfd to the loaded list. */
4862 struct elf_link_loaded_list
*n
;
4864 n
= (struct elf_link_loaded_list
*)
4865 bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4869 n
->next
= htab
->loaded
;
4876 if (old_tab
!= NULL
)
4878 if (nondeflt_vers
!= NULL
)
4879 free (nondeflt_vers
);
4880 if (extversym
!= NULL
)
4883 if (isymbuf
!= NULL
)
4889 /* Return the linker hash table entry of a symbol that might be
4890 satisfied by an archive symbol. Return -1 on error. */
4892 struct elf_link_hash_entry
*
4893 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4894 struct bfd_link_info
*info
,
4897 struct elf_link_hash_entry
*h
;
4901 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4905 /* If this is a default version (the name contains @@), look up the
4906 symbol again with only one `@' as well as without the version.
4907 The effect is that references to the symbol with and without the
4908 version will be matched by the default symbol in the archive. */
4910 p
= strchr (name
, ELF_VER_CHR
);
4911 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4914 /* First check with only one `@'. */
4915 len
= strlen (name
);
4916 copy
= (char *) bfd_alloc (abfd
, len
);
4918 return (struct elf_link_hash_entry
*) 0 - 1;
4920 first
= p
- name
+ 1;
4921 memcpy (copy
, name
, first
);
4922 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4924 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4927 /* We also need to check references to the symbol without the
4929 copy
[first
- 1] = '\0';
4930 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4931 FALSE
, FALSE
, FALSE
);
4934 bfd_release (abfd
, copy
);
4938 /* Add symbols from an ELF archive file to the linker hash table. We
4939 don't use _bfd_generic_link_add_archive_symbols because of a
4940 problem which arises on UnixWare. The UnixWare libc.so is an
4941 archive which includes an entry libc.so.1 which defines a bunch of
4942 symbols. The libc.so archive also includes a number of other
4943 object files, which also define symbols, some of which are the same
4944 as those defined in libc.so.1. Correct linking requires that we
4945 consider each object file in turn, and include it if it defines any
4946 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4947 this; it looks through the list of undefined symbols, and includes
4948 any object file which defines them. When this algorithm is used on
4949 UnixWare, it winds up pulling in libc.so.1 early and defining a
4950 bunch of symbols. This means that some of the other objects in the
4951 archive are not included in the link, which is incorrect since they
4952 precede libc.so.1 in the archive.
4954 Fortunately, ELF archive handling is simpler than that done by
4955 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4956 oddities. In ELF, if we find a symbol in the archive map, and the
4957 symbol is currently undefined, we know that we must pull in that
4960 Unfortunately, we do have to make multiple passes over the symbol
4961 table until nothing further is resolved. */
4964 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4967 bfd_boolean
*defined
= NULL
;
4968 bfd_boolean
*included
= NULL
;
4972 const struct elf_backend_data
*bed
;
4973 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4974 (bfd
*, struct bfd_link_info
*, const char *);
4976 if (! bfd_has_map (abfd
))
4978 /* An empty archive is a special case. */
4979 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4981 bfd_set_error (bfd_error_no_armap
);
4985 /* Keep track of all symbols we know to be already defined, and all
4986 files we know to be already included. This is to speed up the
4987 second and subsequent passes. */
4988 c
= bfd_ardata (abfd
)->symdef_count
;
4992 amt
*= sizeof (bfd_boolean
);
4993 defined
= (bfd_boolean
*) bfd_zmalloc (amt
);
4994 included
= (bfd_boolean
*) bfd_zmalloc (amt
);
4995 if (defined
== NULL
|| included
== NULL
)
4998 symdefs
= bfd_ardata (abfd
)->symdefs
;
4999 bed
= get_elf_backend_data (abfd
);
5000 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5013 symdefend
= symdef
+ c
;
5014 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5016 struct elf_link_hash_entry
*h
;
5018 struct bfd_link_hash_entry
*undefs_tail
;
5021 if (defined
[i
] || included
[i
])
5023 if (symdef
->file_offset
== last
)
5029 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5030 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
5036 if (h
->root
.type
== bfd_link_hash_common
)
5038 /* We currently have a common symbol. The archive map contains
5039 a reference to this symbol, so we may want to include it. We
5040 only want to include it however, if this archive element
5041 contains a definition of the symbol, not just another common
5044 Unfortunately some archivers (including GNU ar) will put
5045 declarations of common symbols into their archive maps, as
5046 well as real definitions, so we cannot just go by the archive
5047 map alone. Instead we must read in the element's symbol
5048 table and check that to see what kind of symbol definition
5050 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5053 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5055 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5060 /* We need to include this archive member. */
5061 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5062 if (element
== NULL
)
5065 if (! bfd_check_format (element
, bfd_object
))
5068 /* Doublecheck that we have not included this object
5069 already--it should be impossible, but there may be
5070 something wrong with the archive. */
5071 if (element
->archive_pass
!= 0)
5073 bfd_set_error (bfd_error_bad_value
);
5076 element
->archive_pass
= 1;
5078 undefs_tail
= info
->hash
->undefs_tail
;
5080 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
5083 if (! bfd_link_add_symbols (element
, info
))
5086 /* If there are any new undefined symbols, we need to make
5087 another pass through the archive in order to see whether
5088 they can be defined. FIXME: This isn't perfect, because
5089 common symbols wind up on undefs_tail and because an
5090 undefined symbol which is defined later on in this pass
5091 does not require another pass. This isn't a bug, but it
5092 does make the code less efficient than it could be. */
5093 if (undefs_tail
!= info
->hash
->undefs_tail
)
5096 /* Look backward to mark all symbols from this object file
5097 which we have already seen in this pass. */
5101 included
[mark
] = TRUE
;
5106 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5108 /* We mark subsequent symbols from this object file as we go
5109 on through the loop. */
5110 last
= symdef
->file_offset
;
5121 if (defined
!= NULL
)
5123 if (included
!= NULL
)
5128 /* Given an ELF BFD, add symbols to the global hash table as
5132 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5134 switch (bfd_get_format (abfd
))
5137 return elf_link_add_object_symbols (abfd
, info
);
5139 return elf_link_add_archive_symbols (abfd
, info
);
5141 bfd_set_error (bfd_error_wrong_format
);
5146 struct hash_codes_info
5148 unsigned long *hashcodes
;
5152 /* This function will be called though elf_link_hash_traverse to store
5153 all hash value of the exported symbols in an array. */
5156 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5158 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5164 if (h
->root
.type
== bfd_link_hash_warning
)
5165 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5167 /* Ignore indirect symbols. These are added by the versioning code. */
5168 if (h
->dynindx
== -1)
5171 name
= h
->root
.root
.string
;
5172 p
= strchr (name
, ELF_VER_CHR
);
5175 alc
= (char *) bfd_malloc (p
- name
+ 1);
5181 memcpy (alc
, name
, p
- name
);
5182 alc
[p
- name
] = '\0';
5186 /* Compute the hash value. */
5187 ha
= bfd_elf_hash (name
);
5189 /* Store the found hash value in the array given as the argument. */
5190 *(inf
->hashcodes
)++ = ha
;
5192 /* And store it in the struct so that we can put it in the hash table
5194 h
->u
.elf_hash_value
= ha
;
5202 struct collect_gnu_hash_codes
5205 const struct elf_backend_data
*bed
;
5206 unsigned long int nsyms
;
5207 unsigned long int maskbits
;
5208 unsigned long int *hashcodes
;
5209 unsigned long int *hashval
;
5210 unsigned long int *indx
;
5211 unsigned long int *counts
;
5214 long int min_dynindx
;
5215 unsigned long int bucketcount
;
5216 unsigned long int symindx
;
5217 long int local_indx
;
5218 long int shift1
, shift2
;
5219 unsigned long int mask
;
5223 /* This function will be called though elf_link_hash_traverse to store
5224 all hash value of the exported symbols in an array. */
5227 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5229 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5235 if (h
->root
.type
== bfd_link_hash_warning
)
5236 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5238 /* Ignore indirect symbols. These are added by the versioning code. */
5239 if (h
->dynindx
== -1)
5242 /* Ignore also local symbols and undefined symbols. */
5243 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5246 name
= h
->root
.root
.string
;
5247 p
= strchr (name
, ELF_VER_CHR
);
5250 alc
= (char *) bfd_malloc (p
- name
+ 1);
5256 memcpy (alc
, name
, p
- name
);
5257 alc
[p
- name
] = '\0';
5261 /* Compute the hash value. */
5262 ha
= bfd_elf_gnu_hash (name
);
5264 /* Store the found hash value in the array for compute_bucket_count,
5265 and also for .dynsym reordering purposes. */
5266 s
->hashcodes
[s
->nsyms
] = ha
;
5267 s
->hashval
[h
->dynindx
] = ha
;
5269 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5270 s
->min_dynindx
= h
->dynindx
;
5278 /* This function will be called though elf_link_hash_traverse to do
5279 final dynaminc symbol renumbering. */
5282 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5284 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5285 unsigned long int bucket
;
5286 unsigned long int val
;
5288 if (h
->root
.type
== bfd_link_hash_warning
)
5289 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5291 /* Ignore indirect symbols. */
5292 if (h
->dynindx
== -1)
5295 /* Ignore also local symbols and undefined symbols. */
5296 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5298 if (h
->dynindx
>= s
->min_dynindx
)
5299 h
->dynindx
= s
->local_indx
++;
5303 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5304 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5305 & ((s
->maskbits
>> s
->shift1
) - 1);
5306 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5308 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5309 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5310 if (s
->counts
[bucket
] == 1)
5311 /* Last element terminates the chain. */
5313 bfd_put_32 (s
->output_bfd
, val
,
5314 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5315 --s
->counts
[bucket
];
5316 h
->dynindx
= s
->indx
[bucket
]++;
5320 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5323 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5325 return !(h
->forced_local
5326 || h
->root
.type
== bfd_link_hash_undefined
5327 || h
->root
.type
== bfd_link_hash_undefweak
5328 || ((h
->root
.type
== bfd_link_hash_defined
5329 || h
->root
.type
== bfd_link_hash_defweak
)
5330 && h
->root
.u
.def
.section
->output_section
== NULL
));
5333 /* Array used to determine the number of hash table buckets to use
5334 based on the number of symbols there are. If there are fewer than
5335 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5336 fewer than 37 we use 17 buckets, and so forth. We never use more
5337 than 32771 buckets. */
5339 static const size_t elf_buckets
[] =
5341 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5345 /* Compute bucket count for hashing table. We do not use a static set
5346 of possible tables sizes anymore. Instead we determine for all
5347 possible reasonable sizes of the table the outcome (i.e., the
5348 number of collisions etc) and choose the best solution. The
5349 weighting functions are not too simple to allow the table to grow
5350 without bounds. Instead one of the weighting factors is the size.
5351 Therefore the result is always a good payoff between few collisions
5352 (= short chain lengths) and table size. */
5354 compute_bucket_count (struct bfd_link_info
*info
,
5355 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5356 unsigned long int nsyms
,
5359 size_t best_size
= 0;
5360 unsigned long int i
;
5362 /* We have a problem here. The following code to optimize the table
5363 size requires an integer type with more the 32 bits. If
5364 BFD_HOST_U_64_BIT is set we know about such a type. */
5365 #ifdef BFD_HOST_U_64_BIT
5370 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5371 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5372 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5373 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5374 unsigned long int *counts
;
5377 /* Possible optimization parameters: if we have NSYMS symbols we say
5378 that the hashing table must at least have NSYMS/4 and at most
5380 minsize
= nsyms
/ 4;
5383 best_size
= maxsize
= nsyms
* 2;
5388 if ((best_size
& 31) == 0)
5392 /* Create array where we count the collisions in. We must use bfd_malloc
5393 since the size could be large. */
5395 amt
*= sizeof (unsigned long int);
5396 counts
= (unsigned long int *) bfd_malloc (amt
);
5400 /* Compute the "optimal" size for the hash table. The criteria is a
5401 minimal chain length. The minor criteria is (of course) the size
5403 for (i
= minsize
; i
< maxsize
; ++i
)
5405 /* Walk through the array of hashcodes and count the collisions. */
5406 BFD_HOST_U_64_BIT max
;
5407 unsigned long int j
;
5408 unsigned long int fact
;
5410 if (gnu_hash
&& (i
& 31) == 0)
5413 memset (counts
, '\0', i
* sizeof (unsigned long int));
5415 /* Determine how often each hash bucket is used. */
5416 for (j
= 0; j
< nsyms
; ++j
)
5417 ++counts
[hashcodes
[j
] % i
];
5419 /* For the weight function we need some information about the
5420 pagesize on the target. This is information need not be 100%
5421 accurate. Since this information is not available (so far) we
5422 define it here to a reasonable default value. If it is crucial
5423 to have a better value some day simply define this value. */
5424 # ifndef BFD_TARGET_PAGESIZE
5425 # define BFD_TARGET_PAGESIZE (4096)
5428 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5430 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5433 /* Variant 1: optimize for short chains. We add the squares
5434 of all the chain lengths (which favors many small chain
5435 over a few long chains). */
5436 for (j
= 0; j
< i
; ++j
)
5437 max
+= counts
[j
] * counts
[j
];
5439 /* This adds penalties for the overall size of the table. */
5440 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5443 /* Variant 2: Optimize a lot more for small table. Here we
5444 also add squares of the size but we also add penalties for
5445 empty slots (the +1 term). */
5446 for (j
= 0; j
< i
; ++j
)
5447 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5449 /* The overall size of the table is considered, but not as
5450 strong as in variant 1, where it is squared. */
5451 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5455 /* Compare with current best results. */
5456 if (max
< best_chlen
)
5466 #endif /* defined (BFD_HOST_U_64_BIT) */
5468 /* This is the fallback solution if no 64bit type is available or if we
5469 are not supposed to spend much time on optimizations. We select the
5470 bucket count using a fixed set of numbers. */
5471 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5473 best_size
= elf_buckets
[i
];
5474 if (nsyms
< elf_buckets
[i
+ 1])
5477 if (gnu_hash
&& best_size
< 2)
5484 /* Set up the sizes and contents of the ELF dynamic sections. This is
5485 called by the ELF linker emulation before_allocation routine. We
5486 must set the sizes of the sections before the linker sets the
5487 addresses of the various sections. */
5490 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5493 const char *filter_shlib
,
5495 const char *depaudit
,
5496 const char * const *auxiliary_filters
,
5497 struct bfd_link_info
*info
,
5498 asection
**sinterpptr
,
5499 struct bfd_elf_version_tree
*verdefs
)
5501 bfd_size_type soname_indx
;
5503 const struct elf_backend_data
*bed
;
5504 struct elf_info_failed asvinfo
;
5508 soname_indx
= (bfd_size_type
) -1;
5510 if (!is_elf_hash_table (info
->hash
))
5513 bed
= get_elf_backend_data (output_bfd
);
5514 if (info
->execstack
)
5515 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
5516 else if (info
->noexecstack
)
5517 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
5521 asection
*notesec
= NULL
;
5524 for (inputobj
= info
->input_bfds
;
5526 inputobj
= inputobj
->link_next
)
5530 if (inputobj
->flags
& (DYNAMIC
| EXEC_P
| BFD_LINKER_CREATED
))
5532 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5535 if (s
->flags
& SEC_CODE
)
5539 else if (bed
->default_execstack
)
5544 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
5545 if (exec
&& info
->relocatable
5546 && notesec
->output_section
!= bfd_abs_section_ptr
)
5547 notesec
->output_section
->flags
|= SEC_CODE
;
5551 /* Any syms created from now on start with -1 in
5552 got.refcount/offset and plt.refcount/offset. */
5553 elf_hash_table (info
)->init_got_refcount
5554 = elf_hash_table (info
)->init_got_offset
;
5555 elf_hash_table (info
)->init_plt_refcount
5556 = elf_hash_table (info
)->init_plt_offset
;
5558 /* The backend may have to create some sections regardless of whether
5559 we're dynamic or not. */
5560 if (bed
->elf_backend_always_size_sections
5561 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5564 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
5567 dynobj
= elf_hash_table (info
)->dynobj
;
5569 /* If there were no dynamic objects in the link, there is nothing to
5574 if (elf_hash_table (info
)->dynamic_sections_created
)
5576 struct elf_info_failed eif
;
5577 struct elf_link_hash_entry
*h
;
5579 struct bfd_elf_version_tree
*t
;
5580 struct bfd_elf_version_expr
*d
;
5582 bfd_boolean all_defined
;
5584 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
5585 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
5589 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5591 if (soname_indx
== (bfd_size_type
) -1
5592 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5598 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5600 info
->flags
|= DF_SYMBOLIC
;
5607 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5609 if (indx
== (bfd_size_type
) -1
5610 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
5613 if (info
->new_dtags
)
5615 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
5616 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
5621 if (filter_shlib
!= NULL
)
5625 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5626 filter_shlib
, TRUE
);
5627 if (indx
== (bfd_size_type
) -1
5628 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5632 if (auxiliary_filters
!= NULL
)
5634 const char * const *p
;
5636 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5640 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5642 if (indx
== (bfd_size_type
) -1
5643 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5652 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
5654 if (indx
== (bfd_size_type
) -1
5655 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
5659 if (depaudit
!= NULL
)
5663 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
5665 if (indx
== (bfd_size_type
) -1
5666 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
5671 eif
.verdefs
= verdefs
;
5674 /* If we are supposed to export all symbols into the dynamic symbol
5675 table (this is not the normal case), then do so. */
5676 if (info
->export_dynamic
5677 || (info
->executable
&& info
->dynamic
))
5679 elf_link_hash_traverse (elf_hash_table (info
),
5680 _bfd_elf_export_symbol
,
5686 /* Make all global versions with definition. */
5687 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5688 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5689 if (!d
->symver
&& d
->literal
)
5691 const char *verstr
, *name
;
5692 size_t namelen
, verlen
, newlen
;
5694 struct elf_link_hash_entry
*newh
;
5697 namelen
= strlen (name
);
5699 verlen
= strlen (verstr
);
5700 newlen
= namelen
+ verlen
+ 3;
5702 newname
= (char *) bfd_malloc (newlen
);
5703 if (newname
== NULL
)
5705 memcpy (newname
, name
, namelen
);
5707 /* Check the hidden versioned definition. */
5708 p
= newname
+ namelen
;
5710 memcpy (p
, verstr
, verlen
+ 1);
5711 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5712 newname
, FALSE
, FALSE
,
5715 || (newh
->root
.type
!= bfd_link_hash_defined
5716 && newh
->root
.type
!= bfd_link_hash_defweak
))
5718 /* Check the default versioned definition. */
5720 memcpy (p
, verstr
, verlen
+ 1);
5721 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5722 newname
, FALSE
, FALSE
,
5727 /* Mark this version if there is a definition and it is
5728 not defined in a shared object. */
5730 && !newh
->def_dynamic
5731 && (newh
->root
.type
== bfd_link_hash_defined
5732 || newh
->root
.type
== bfd_link_hash_defweak
))
5736 /* Attach all the symbols to their version information. */
5737 asvinfo
.info
= info
;
5738 asvinfo
.verdefs
= verdefs
;
5739 asvinfo
.failed
= FALSE
;
5741 elf_link_hash_traverse (elf_hash_table (info
),
5742 _bfd_elf_link_assign_sym_version
,
5747 if (!info
->allow_undefined_version
)
5749 /* Check if all global versions have a definition. */
5751 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5752 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5753 if (d
->literal
&& !d
->symver
&& !d
->script
)
5755 (*_bfd_error_handler
)
5756 (_("%s: undefined version: %s"),
5757 d
->pattern
, t
->name
);
5758 all_defined
= FALSE
;
5763 bfd_set_error (bfd_error_bad_value
);
5768 /* Find all symbols which were defined in a dynamic object and make
5769 the backend pick a reasonable value for them. */
5770 elf_link_hash_traverse (elf_hash_table (info
),
5771 _bfd_elf_adjust_dynamic_symbol
,
5776 /* Add some entries to the .dynamic section. We fill in some of the
5777 values later, in bfd_elf_final_link, but we must add the entries
5778 now so that we know the final size of the .dynamic section. */
5780 /* If there are initialization and/or finalization functions to
5781 call then add the corresponding DT_INIT/DT_FINI entries. */
5782 h
= (info
->init_function
5783 ? elf_link_hash_lookup (elf_hash_table (info
),
5784 info
->init_function
, FALSE
,
5791 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5794 h
= (info
->fini_function
5795 ? elf_link_hash_lookup (elf_hash_table (info
),
5796 info
->fini_function
, FALSE
,
5803 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5807 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
5808 if (s
!= NULL
&& s
->linker_has_input
)
5810 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5811 if (! info
->executable
)
5816 for (sub
= info
->input_bfds
; sub
!= NULL
;
5817 sub
= sub
->link_next
)
5818 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
5819 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5820 if (elf_section_data (o
)->this_hdr
.sh_type
5821 == SHT_PREINIT_ARRAY
)
5823 (*_bfd_error_handler
)
5824 (_("%B: .preinit_array section is not allowed in DSO"),
5829 bfd_set_error (bfd_error_nonrepresentable_section
);
5833 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5834 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5837 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
5838 if (s
!= NULL
&& s
->linker_has_input
)
5840 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5841 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5844 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
5845 if (s
!= NULL
&& s
->linker_has_input
)
5847 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5848 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5852 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
5853 /* If .dynstr is excluded from the link, we don't want any of
5854 these tags. Strictly, we should be checking each section
5855 individually; This quick check covers for the case where
5856 someone does a /DISCARD/ : { *(*) }. */
5857 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5859 bfd_size_type strsize
;
5861 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5862 if ((info
->emit_hash
5863 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
5864 || (info
->emit_gnu_hash
5865 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
5866 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5867 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5868 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5869 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5870 bed
->s
->sizeof_sym
))
5875 /* The backend must work out the sizes of all the other dynamic
5877 if (bed
->elf_backend_size_dynamic_sections
5878 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5881 if (elf_hash_table (info
)->dynamic_sections_created
)
5883 unsigned long section_sym_count
;
5886 /* Set up the version definition section. */
5887 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5888 BFD_ASSERT (s
!= NULL
);
5890 /* We may have created additional version definitions if we are
5891 just linking a regular application. */
5892 verdefs
= asvinfo
.verdefs
;
5894 /* Skip anonymous version tag. */
5895 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5896 verdefs
= verdefs
->next
;
5898 if (verdefs
== NULL
&& !info
->create_default_symver
)
5899 s
->flags
|= SEC_EXCLUDE
;
5904 struct bfd_elf_version_tree
*t
;
5906 Elf_Internal_Verdef def
;
5907 Elf_Internal_Verdaux defaux
;
5908 struct bfd_link_hash_entry
*bh
;
5909 struct elf_link_hash_entry
*h
;
5915 /* Make space for the base version. */
5916 size
+= sizeof (Elf_External_Verdef
);
5917 size
+= sizeof (Elf_External_Verdaux
);
5920 /* Make space for the default version. */
5921 if (info
->create_default_symver
)
5923 size
+= sizeof (Elf_External_Verdef
);
5927 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5929 struct bfd_elf_version_deps
*n
;
5931 size
+= sizeof (Elf_External_Verdef
);
5932 size
+= sizeof (Elf_External_Verdaux
);
5935 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5936 size
+= sizeof (Elf_External_Verdaux
);
5940 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
5941 if (s
->contents
== NULL
&& s
->size
!= 0)
5944 /* Fill in the version definition section. */
5948 def
.vd_version
= VER_DEF_CURRENT
;
5949 def
.vd_flags
= VER_FLG_BASE
;
5952 if (info
->create_default_symver
)
5954 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
5955 def
.vd_next
= sizeof (Elf_External_Verdef
);
5959 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5960 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5961 + sizeof (Elf_External_Verdaux
));
5964 if (soname_indx
!= (bfd_size_type
) -1)
5966 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5968 def
.vd_hash
= bfd_elf_hash (soname
);
5969 defaux
.vda_name
= soname_indx
;
5976 name
= lbasename (output_bfd
->filename
);
5977 def
.vd_hash
= bfd_elf_hash (name
);
5978 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5980 if (indx
== (bfd_size_type
) -1)
5982 defaux
.vda_name
= indx
;
5984 defaux
.vda_next
= 0;
5986 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5987 (Elf_External_Verdef
*) p
);
5988 p
+= sizeof (Elf_External_Verdef
);
5989 if (info
->create_default_symver
)
5991 /* Add a symbol representing this version. */
5993 if (! (_bfd_generic_link_add_one_symbol
5994 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5996 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5998 h
= (struct elf_link_hash_entry
*) bh
;
6001 h
->type
= STT_OBJECT
;
6002 h
->verinfo
.vertree
= NULL
;
6004 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6007 /* Create a duplicate of the base version with the same
6008 aux block, but different flags. */
6011 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6013 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6014 + sizeof (Elf_External_Verdaux
));
6017 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6018 (Elf_External_Verdef
*) p
);
6019 p
+= sizeof (Elf_External_Verdef
);
6021 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6022 (Elf_External_Verdaux
*) p
);
6023 p
+= sizeof (Elf_External_Verdaux
);
6025 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6028 struct bfd_elf_version_deps
*n
;
6031 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6034 /* Add a symbol representing this version. */
6036 if (! (_bfd_generic_link_add_one_symbol
6037 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6039 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6041 h
= (struct elf_link_hash_entry
*) bh
;
6044 h
->type
= STT_OBJECT
;
6045 h
->verinfo
.vertree
= t
;
6047 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6050 def
.vd_version
= VER_DEF_CURRENT
;
6052 if (t
->globals
.list
== NULL
6053 && t
->locals
.list
== NULL
6055 def
.vd_flags
|= VER_FLG_WEAK
;
6056 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6057 def
.vd_cnt
= cdeps
+ 1;
6058 def
.vd_hash
= bfd_elf_hash (t
->name
);
6059 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6061 if (t
->next
!= NULL
)
6062 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6063 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6065 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6066 (Elf_External_Verdef
*) p
);
6067 p
+= sizeof (Elf_External_Verdef
);
6069 defaux
.vda_name
= h
->dynstr_index
;
6070 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6072 defaux
.vda_next
= 0;
6073 if (t
->deps
!= NULL
)
6074 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6075 t
->name_indx
= defaux
.vda_name
;
6077 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6078 (Elf_External_Verdaux
*) p
);
6079 p
+= sizeof (Elf_External_Verdaux
);
6081 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6083 if (n
->version_needed
== NULL
)
6085 /* This can happen if there was an error in the
6087 defaux
.vda_name
= 0;
6091 defaux
.vda_name
= n
->version_needed
->name_indx
;
6092 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6095 if (n
->next
== NULL
)
6096 defaux
.vda_next
= 0;
6098 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6100 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6101 (Elf_External_Verdaux
*) p
);
6102 p
+= sizeof (Elf_External_Verdaux
);
6106 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
6107 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
6110 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6113 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
6115 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
6118 else if (info
->flags
& DF_BIND_NOW
)
6120 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
6126 if (info
->executable
)
6127 info
->flags_1
&= ~ (DF_1_INITFIRST
6130 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
6134 /* Work out the size of the version reference section. */
6136 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
6137 BFD_ASSERT (s
!= NULL
);
6139 struct elf_find_verdep_info sinfo
;
6142 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6143 if (sinfo
.vers
== 0)
6145 sinfo
.failed
= FALSE
;
6147 elf_link_hash_traverse (elf_hash_table (info
),
6148 _bfd_elf_link_find_version_dependencies
,
6153 if (elf_tdata (output_bfd
)->verref
== NULL
)
6154 s
->flags
|= SEC_EXCLUDE
;
6157 Elf_Internal_Verneed
*t
;
6162 /* Build the version definition section. */
6165 for (t
= elf_tdata (output_bfd
)->verref
;
6169 Elf_Internal_Vernaux
*a
;
6171 size
+= sizeof (Elf_External_Verneed
);
6173 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6174 size
+= sizeof (Elf_External_Vernaux
);
6178 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6179 if (s
->contents
== NULL
)
6183 for (t
= elf_tdata (output_bfd
)->verref
;
6188 Elf_Internal_Vernaux
*a
;
6192 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6195 t
->vn_version
= VER_NEED_CURRENT
;
6197 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6198 elf_dt_name (t
->vn_bfd
) != NULL
6199 ? elf_dt_name (t
->vn_bfd
)
6200 : lbasename (t
->vn_bfd
->filename
),
6202 if (indx
== (bfd_size_type
) -1)
6205 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6206 if (t
->vn_nextref
== NULL
)
6209 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6210 + caux
* sizeof (Elf_External_Vernaux
));
6212 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6213 (Elf_External_Verneed
*) p
);
6214 p
+= sizeof (Elf_External_Verneed
);
6216 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6218 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6219 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6220 a
->vna_nodename
, FALSE
);
6221 if (indx
== (bfd_size_type
) -1)
6224 if (a
->vna_nextptr
== NULL
)
6227 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6229 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6230 (Elf_External_Vernaux
*) p
);
6231 p
+= sizeof (Elf_External_Vernaux
);
6235 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6236 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6239 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6243 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6244 && elf_tdata (output_bfd
)->cverdefs
== 0)
6245 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6246 §ion_sym_count
) == 0)
6248 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6249 s
->flags
|= SEC_EXCLUDE
;
6255 /* Find the first non-excluded output section. We'll use its
6256 section symbol for some emitted relocs. */
6258 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6262 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6263 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6264 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6266 elf_hash_table (info
)->text_index_section
= s
;
6271 /* Find two non-excluded output sections, one for code, one for data.
6272 We'll use their section symbols for some emitted relocs. */
6274 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6278 /* Data first, since setting text_index_section changes
6279 _bfd_elf_link_omit_section_dynsym. */
6280 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6281 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6282 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6284 elf_hash_table (info
)->data_index_section
= s
;
6288 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6289 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6290 == (SEC_ALLOC
| SEC_READONLY
))
6291 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6293 elf_hash_table (info
)->text_index_section
= s
;
6297 if (elf_hash_table (info
)->text_index_section
== NULL
)
6298 elf_hash_table (info
)->text_index_section
6299 = elf_hash_table (info
)->data_index_section
;
6303 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6305 const struct elf_backend_data
*bed
;
6307 if (!is_elf_hash_table (info
->hash
))
6310 bed
= get_elf_backend_data (output_bfd
);
6311 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6313 if (elf_hash_table (info
)->dynamic_sections_created
)
6317 bfd_size_type dynsymcount
;
6318 unsigned long section_sym_count
;
6319 unsigned int dtagcount
;
6321 dynobj
= elf_hash_table (info
)->dynobj
;
6323 /* Assign dynsym indicies. In a shared library we generate a
6324 section symbol for each output section, which come first.
6325 Next come all of the back-end allocated local dynamic syms,
6326 followed by the rest of the global symbols. */
6328 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6329 §ion_sym_count
);
6331 /* Work out the size of the symbol version section. */
6332 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6333 BFD_ASSERT (s
!= NULL
);
6334 if (dynsymcount
!= 0
6335 && (s
->flags
& SEC_EXCLUDE
) == 0)
6337 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6338 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6339 if (s
->contents
== NULL
)
6342 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6346 /* Set the size of the .dynsym and .hash sections. We counted
6347 the number of dynamic symbols in elf_link_add_object_symbols.
6348 We will build the contents of .dynsym and .hash when we build
6349 the final symbol table, because until then we do not know the
6350 correct value to give the symbols. We built the .dynstr
6351 section as we went along in elf_link_add_object_symbols. */
6352 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
6353 BFD_ASSERT (s
!= NULL
);
6354 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6356 if (dynsymcount
!= 0)
6358 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6359 if (s
->contents
== NULL
)
6362 /* The first entry in .dynsym is a dummy symbol.
6363 Clear all the section syms, in case we don't output them all. */
6364 ++section_sym_count
;
6365 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6368 elf_hash_table (info
)->bucketcount
= 0;
6370 /* Compute the size of the hashing table. As a side effect this
6371 computes the hash values for all the names we export. */
6372 if (info
->emit_hash
)
6374 unsigned long int *hashcodes
;
6375 struct hash_codes_info hashinf
;
6377 unsigned long int nsyms
;
6379 size_t hash_entry_size
;
6381 /* Compute the hash values for all exported symbols. At the same
6382 time store the values in an array so that we could use them for
6384 amt
= dynsymcount
* sizeof (unsigned long int);
6385 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
6386 if (hashcodes
== NULL
)
6388 hashinf
.hashcodes
= hashcodes
;
6389 hashinf
.error
= FALSE
;
6391 /* Put all hash values in HASHCODES. */
6392 elf_link_hash_traverse (elf_hash_table (info
),
6393 elf_collect_hash_codes
, &hashinf
);
6400 nsyms
= hashinf
.hashcodes
- hashcodes
;
6402 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6405 if (bucketcount
== 0)
6408 elf_hash_table (info
)->bucketcount
= bucketcount
;
6410 s
= bfd_get_section_by_name (dynobj
, ".hash");
6411 BFD_ASSERT (s
!= NULL
);
6412 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6413 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6414 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6415 if (s
->contents
== NULL
)
6418 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6419 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6420 s
->contents
+ hash_entry_size
);
6423 if (info
->emit_gnu_hash
)
6426 unsigned char *contents
;
6427 struct collect_gnu_hash_codes cinfo
;
6431 memset (&cinfo
, 0, sizeof (cinfo
));
6433 /* Compute the hash values for all exported symbols. At the same
6434 time store the values in an array so that we could use them for
6436 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6437 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
6438 if (cinfo
.hashcodes
== NULL
)
6441 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6442 cinfo
.min_dynindx
= -1;
6443 cinfo
.output_bfd
= output_bfd
;
6446 /* Put all hash values in HASHCODES. */
6447 elf_link_hash_traverse (elf_hash_table (info
),
6448 elf_collect_gnu_hash_codes
, &cinfo
);
6451 free (cinfo
.hashcodes
);
6456 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6458 if (bucketcount
== 0)
6460 free (cinfo
.hashcodes
);
6464 s
= bfd_get_section_by_name (dynobj
, ".gnu.hash");
6465 BFD_ASSERT (s
!= NULL
);
6467 if (cinfo
.nsyms
== 0)
6469 /* Empty .gnu.hash section is special. */
6470 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6471 free (cinfo
.hashcodes
);
6472 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6473 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6474 if (contents
== NULL
)
6476 s
->contents
= contents
;
6477 /* 1 empty bucket. */
6478 bfd_put_32 (output_bfd
, 1, contents
);
6479 /* SYMIDX above the special symbol 0. */
6480 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6481 /* Just one word for bitmask. */
6482 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6483 /* Only hash fn bloom filter. */
6484 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6485 /* No hashes are valid - empty bitmask. */
6486 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6487 /* No hashes in the only bucket. */
6488 bfd_put_32 (output_bfd
, 0,
6489 contents
+ 16 + bed
->s
->arch_size
/ 8);
6493 unsigned long int maskwords
, maskbitslog2
;
6494 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6496 maskbitslog2
= bfd_log2 (cinfo
.nsyms
) + 1;
6497 if (maskbitslog2
< 3)
6499 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6500 maskbitslog2
= maskbitslog2
+ 3;
6502 maskbitslog2
= maskbitslog2
+ 2;
6503 if (bed
->s
->arch_size
== 64)
6505 if (maskbitslog2
== 5)
6511 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6512 cinfo
.shift2
= maskbitslog2
;
6513 cinfo
.maskbits
= 1 << maskbitslog2
;
6514 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6515 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6516 amt
+= maskwords
* sizeof (bfd_vma
);
6517 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
6518 if (cinfo
.bitmask
== NULL
)
6520 free (cinfo
.hashcodes
);
6524 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
6525 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6526 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6527 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6529 /* Determine how often each hash bucket is used. */
6530 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6531 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6532 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6534 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6535 if (cinfo
.counts
[i
] != 0)
6537 cinfo
.indx
[i
] = cnt
;
6538 cnt
+= cinfo
.counts
[i
];
6540 BFD_ASSERT (cnt
== dynsymcount
);
6541 cinfo
.bucketcount
= bucketcount
;
6542 cinfo
.local_indx
= cinfo
.min_dynindx
;
6544 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6545 s
->size
+= cinfo
.maskbits
/ 8;
6546 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6547 if (contents
== NULL
)
6549 free (cinfo
.bitmask
);
6550 free (cinfo
.hashcodes
);
6554 s
->contents
= contents
;
6555 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6556 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6557 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6558 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6559 contents
+= 16 + cinfo
.maskbits
/ 8;
6561 for (i
= 0; i
< bucketcount
; ++i
)
6563 if (cinfo
.counts
[i
] == 0)
6564 bfd_put_32 (output_bfd
, 0, contents
);
6566 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6570 cinfo
.contents
= contents
;
6572 /* Renumber dynamic symbols, populate .gnu.hash section. */
6573 elf_link_hash_traverse (elf_hash_table (info
),
6574 elf_renumber_gnu_hash_syms
, &cinfo
);
6576 contents
= s
->contents
+ 16;
6577 for (i
= 0; i
< maskwords
; ++i
)
6579 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6581 contents
+= bed
->s
->arch_size
/ 8;
6584 free (cinfo
.bitmask
);
6585 free (cinfo
.hashcodes
);
6589 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
6590 BFD_ASSERT (s
!= NULL
);
6592 elf_finalize_dynstr (output_bfd
, info
);
6594 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6596 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6597 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
6604 /* Indicate that we are only retrieving symbol values from this
6608 _bfd_elf_link_just_syms (asection
*sec
, struct bfd_link_info
*info
)
6610 if (is_elf_hash_table (info
->hash
))
6611 sec
->sec_info_type
= ELF_INFO_TYPE_JUST_SYMS
;
6612 _bfd_generic_link_just_syms (sec
, info
);
6615 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6618 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
6621 BFD_ASSERT (sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
);
6622 sec
->sec_info_type
= ELF_INFO_TYPE_NONE
;
6625 /* Finish SHF_MERGE section merging. */
6628 _bfd_elf_merge_sections (bfd
*abfd
, struct bfd_link_info
*info
)
6633 if (!is_elf_hash_table (info
->hash
))
6636 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
6637 if ((ibfd
->flags
& DYNAMIC
) == 0)
6638 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6639 if ((sec
->flags
& SEC_MERGE
) != 0
6640 && !bfd_is_abs_section (sec
->output_section
))
6642 struct bfd_elf_section_data
*secdata
;
6644 secdata
= elf_section_data (sec
);
6645 if (! _bfd_add_merge_section (abfd
,
6646 &elf_hash_table (info
)->merge_info
,
6647 sec
, &secdata
->sec_info
))
6649 else if (secdata
->sec_info
)
6650 sec
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
6653 if (elf_hash_table (info
)->merge_info
!= NULL
)
6654 _bfd_merge_sections (abfd
, info
, elf_hash_table (info
)->merge_info
,
6655 merge_sections_remove_hook
);
6659 /* Create an entry in an ELF linker hash table. */
6661 struct bfd_hash_entry
*
6662 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
6663 struct bfd_hash_table
*table
,
6666 /* Allocate the structure if it has not already been allocated by a
6670 entry
= (struct bfd_hash_entry
*)
6671 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
6676 /* Call the allocation method of the superclass. */
6677 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
6680 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
6681 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
6683 /* Set local fields. */
6686 ret
->got
= htab
->init_got_refcount
;
6687 ret
->plt
= htab
->init_plt_refcount
;
6688 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
6689 - offsetof (struct elf_link_hash_entry
, size
)));
6690 /* Assume that we have been called by a non-ELF symbol reader.
6691 This flag is then reset by the code which reads an ELF input
6692 file. This ensures that a symbol created by a non-ELF symbol
6693 reader will have the flag set correctly. */
6700 /* Copy data from an indirect symbol to its direct symbol, hiding the
6701 old indirect symbol. Also used for copying flags to a weakdef. */
6704 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
6705 struct elf_link_hash_entry
*dir
,
6706 struct elf_link_hash_entry
*ind
)
6708 struct elf_link_hash_table
*htab
;
6710 /* Copy down any references that we may have already seen to the
6711 symbol which just became indirect. */
6713 dir
->ref_dynamic
|= ind
->ref_dynamic
;
6714 dir
->ref_regular
|= ind
->ref_regular
;
6715 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
6716 dir
->non_got_ref
|= ind
->non_got_ref
;
6717 dir
->needs_plt
|= ind
->needs_plt
;
6718 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
6720 if (ind
->root
.type
!= bfd_link_hash_indirect
)
6723 /* Copy over the global and procedure linkage table refcount entries.
6724 These may have been already set up by a check_relocs routine. */
6725 htab
= elf_hash_table (info
);
6726 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
6728 if (dir
->got
.refcount
< 0)
6729 dir
->got
.refcount
= 0;
6730 dir
->got
.refcount
+= ind
->got
.refcount
;
6731 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
6734 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
6736 if (dir
->plt
.refcount
< 0)
6737 dir
->plt
.refcount
= 0;
6738 dir
->plt
.refcount
+= ind
->plt
.refcount
;
6739 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
6742 if (ind
->dynindx
!= -1)
6744 if (dir
->dynindx
!= -1)
6745 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
6746 dir
->dynindx
= ind
->dynindx
;
6747 dir
->dynstr_index
= ind
->dynstr_index
;
6749 ind
->dynstr_index
= 0;
6754 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
6755 struct elf_link_hash_entry
*h
,
6756 bfd_boolean force_local
)
6758 /* STT_GNU_IFUNC symbol must go through PLT. */
6759 if (h
->type
!= STT_GNU_IFUNC
)
6761 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
6766 h
->forced_local
= 1;
6767 if (h
->dynindx
!= -1)
6770 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
6776 /* Initialize an ELF linker hash table. */
6779 _bfd_elf_link_hash_table_init
6780 (struct elf_link_hash_table
*table
,
6782 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
6783 struct bfd_hash_table
*,
6785 unsigned int entsize
)
6788 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
6790 memset (table
, 0, sizeof * table
);
6791 table
->init_got_refcount
.refcount
= can_refcount
- 1;
6792 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
6793 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
6794 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
6795 /* The first dynamic symbol is a dummy. */
6796 table
->dynsymcount
= 1;
6798 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
6799 table
->root
.type
= bfd_link_elf_hash_table
;
6804 /* Create an ELF linker hash table. */
6806 struct bfd_link_hash_table
*
6807 _bfd_elf_link_hash_table_create (bfd
*abfd
)
6809 struct elf_link_hash_table
*ret
;
6810 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
6812 ret
= (struct elf_link_hash_table
*) bfd_malloc (amt
);
6816 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
6817 sizeof (struct elf_link_hash_entry
)))
6826 /* This is a hook for the ELF emulation code in the generic linker to
6827 tell the backend linker what file name to use for the DT_NEEDED
6828 entry for a dynamic object. */
6831 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
6833 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6834 && bfd_get_format (abfd
) == bfd_object
)
6835 elf_dt_name (abfd
) = name
;
6839 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
6842 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6843 && bfd_get_format (abfd
) == bfd_object
)
6844 lib_class
= elf_dyn_lib_class (abfd
);
6851 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
6853 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6854 && bfd_get_format (abfd
) == bfd_object
)
6855 elf_dyn_lib_class (abfd
) = lib_class
;
6858 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6859 the linker ELF emulation code. */
6861 struct bfd_link_needed_list
*
6862 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6863 struct bfd_link_info
*info
)
6865 if (! is_elf_hash_table (info
->hash
))
6867 return elf_hash_table (info
)->needed
;
6870 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6871 hook for the linker ELF emulation code. */
6873 struct bfd_link_needed_list
*
6874 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6875 struct bfd_link_info
*info
)
6877 if (! is_elf_hash_table (info
->hash
))
6879 return elf_hash_table (info
)->runpath
;
6882 /* Get the name actually used for a dynamic object for a link. This
6883 is the SONAME entry if there is one. Otherwise, it is the string
6884 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6887 bfd_elf_get_dt_soname (bfd
*abfd
)
6889 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6890 && bfd_get_format (abfd
) == bfd_object
)
6891 return elf_dt_name (abfd
);
6895 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6896 the ELF linker emulation code. */
6899 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
6900 struct bfd_link_needed_list
**pneeded
)
6903 bfd_byte
*dynbuf
= NULL
;
6904 unsigned int elfsec
;
6905 unsigned long shlink
;
6906 bfd_byte
*extdyn
, *extdynend
;
6908 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
6912 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
6913 || bfd_get_format (abfd
) != bfd_object
)
6916 s
= bfd_get_section_by_name (abfd
, ".dynamic");
6917 if (s
== NULL
|| s
->size
== 0)
6920 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
6923 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
6924 if (elfsec
== SHN_BAD
)
6927 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
6929 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
6930 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
6933 extdynend
= extdyn
+ s
->size
;
6934 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
6936 Elf_Internal_Dyn dyn
;
6938 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
6940 if (dyn
.d_tag
== DT_NULL
)
6943 if (dyn
.d_tag
== DT_NEEDED
)
6946 struct bfd_link_needed_list
*l
;
6947 unsigned int tagv
= dyn
.d_un
.d_val
;
6950 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
6955 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
6976 struct elf_symbuf_symbol
6978 unsigned long st_name
; /* Symbol name, index in string tbl */
6979 unsigned char st_info
; /* Type and binding attributes */
6980 unsigned char st_other
; /* Visibilty, and target specific */
6983 struct elf_symbuf_head
6985 struct elf_symbuf_symbol
*ssym
;
6986 bfd_size_type count
;
6987 unsigned int st_shndx
;
6994 Elf_Internal_Sym
*isym
;
6995 struct elf_symbuf_symbol
*ssym
;
7000 /* Sort references to symbols by ascending section number. */
7003 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
7005 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
7006 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
7008 return s1
->st_shndx
- s2
->st_shndx
;
7012 elf_sym_name_compare (const void *arg1
, const void *arg2
)
7014 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
7015 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
7016 return strcmp (s1
->name
, s2
->name
);
7019 static struct elf_symbuf_head
*
7020 elf_create_symbuf (bfd_size_type symcount
, Elf_Internal_Sym
*isymbuf
)
7022 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
7023 struct elf_symbuf_symbol
*ssym
;
7024 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
7025 bfd_size_type i
, shndx_count
, total_size
;
7027 indbuf
= (Elf_Internal_Sym
**) bfd_malloc2 (symcount
, sizeof (*indbuf
));
7031 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
7032 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
7033 *ind
++ = &isymbuf
[i
];
7036 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
7037 elf_sort_elf_symbol
);
7040 if (indbufend
> indbuf
)
7041 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
7042 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
7045 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
7046 + (indbufend
- indbuf
) * sizeof (*ssym
));
7047 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
7048 if (ssymbuf
== NULL
)
7054 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
7055 ssymbuf
->ssym
= NULL
;
7056 ssymbuf
->count
= shndx_count
;
7057 ssymbuf
->st_shndx
= 0;
7058 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
7060 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
7063 ssymhead
->ssym
= ssym
;
7064 ssymhead
->count
= 0;
7065 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
7067 ssym
->st_name
= (*ind
)->st_name
;
7068 ssym
->st_info
= (*ind
)->st_info
;
7069 ssym
->st_other
= (*ind
)->st_other
;
7072 BFD_ASSERT ((bfd_size_type
) (ssymhead
- ssymbuf
) == shndx_count
7073 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
7080 /* Check if 2 sections define the same set of local and global
7084 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
7085 struct bfd_link_info
*info
)
7088 const struct elf_backend_data
*bed1
, *bed2
;
7089 Elf_Internal_Shdr
*hdr1
, *hdr2
;
7090 bfd_size_type symcount1
, symcount2
;
7091 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
7092 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
7093 Elf_Internal_Sym
*isym
, *isymend
;
7094 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
7095 bfd_size_type count1
, count2
, i
;
7096 unsigned int shndx1
, shndx2
;
7102 /* Both sections have to be in ELF. */
7103 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
7104 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
7107 if (elf_section_type (sec1
) != elf_section_type (sec2
))
7110 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
7111 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
7112 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
7115 bed1
= get_elf_backend_data (bfd1
);
7116 bed2
= get_elf_backend_data (bfd2
);
7117 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
7118 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
7119 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
7120 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
7122 if (symcount1
== 0 || symcount2
== 0)
7128 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
7129 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
7131 if (ssymbuf1
== NULL
)
7133 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
7135 if (isymbuf1
== NULL
)
7138 if (!info
->reduce_memory_overheads
)
7139 elf_tdata (bfd1
)->symbuf
= ssymbuf1
7140 = elf_create_symbuf (symcount1
, isymbuf1
);
7143 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
7145 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
7147 if (isymbuf2
== NULL
)
7150 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
7151 elf_tdata (bfd2
)->symbuf
= ssymbuf2
7152 = elf_create_symbuf (symcount2
, isymbuf2
);
7155 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7157 /* Optimized faster version. */
7158 bfd_size_type lo
, hi
, mid
;
7159 struct elf_symbol
*symp
;
7160 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7163 hi
= ssymbuf1
->count
;
7168 mid
= (lo
+ hi
) / 2;
7169 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7171 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7175 count1
= ssymbuf1
[mid
].count
;
7182 hi
= ssymbuf2
->count
;
7187 mid
= (lo
+ hi
) / 2;
7188 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7190 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7194 count2
= ssymbuf2
[mid
].count
;
7200 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7203 symtable1
= (struct elf_symbol
*)
7204 bfd_malloc (count1
* sizeof (struct elf_symbol
));
7205 symtable2
= (struct elf_symbol
*)
7206 bfd_malloc (count2
* sizeof (struct elf_symbol
));
7207 if (symtable1
== NULL
|| symtable2
== NULL
)
7211 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7212 ssym
< ssymend
; ssym
++, symp
++)
7214 symp
->u
.ssym
= ssym
;
7215 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7221 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7222 ssym
< ssymend
; ssym
++, symp
++)
7224 symp
->u
.ssym
= ssym
;
7225 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7230 /* Sort symbol by name. */
7231 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7232 elf_sym_name_compare
);
7233 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7234 elf_sym_name_compare
);
7236 for (i
= 0; i
< count1
; i
++)
7237 /* Two symbols must have the same binding, type and name. */
7238 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7239 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7240 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7247 symtable1
= (struct elf_symbol
*)
7248 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7249 symtable2
= (struct elf_symbol
*)
7250 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7251 if (symtable1
== NULL
|| symtable2
== NULL
)
7254 /* Count definitions in the section. */
7256 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7257 if (isym
->st_shndx
== shndx1
)
7258 symtable1
[count1
++].u
.isym
= isym
;
7261 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7262 if (isym
->st_shndx
== shndx2
)
7263 symtable2
[count2
++].u
.isym
= isym
;
7265 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7268 for (i
= 0; i
< count1
; i
++)
7270 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7271 symtable1
[i
].u
.isym
->st_name
);
7273 for (i
= 0; i
< count2
; i
++)
7275 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7276 symtable2
[i
].u
.isym
->st_name
);
7278 /* Sort symbol by name. */
7279 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7280 elf_sym_name_compare
);
7281 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7282 elf_sym_name_compare
);
7284 for (i
= 0; i
< count1
; i
++)
7285 /* Two symbols must have the same binding, type and name. */
7286 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7287 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7288 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7306 /* Return TRUE if 2 section types are compatible. */
7309 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7310 bfd
*bbfd
, const asection
*bsec
)
7314 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7315 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7318 return elf_section_type (asec
) == elf_section_type (bsec
);
7321 /* Final phase of ELF linker. */
7323 /* A structure we use to avoid passing large numbers of arguments. */
7325 struct elf_final_link_info
7327 /* General link information. */
7328 struct bfd_link_info
*info
;
7331 /* Symbol string table. */
7332 struct bfd_strtab_hash
*symstrtab
;
7333 /* .dynsym section. */
7334 asection
*dynsym_sec
;
7335 /* .hash section. */
7337 /* symbol version section (.gnu.version). */
7338 asection
*symver_sec
;
7339 /* Buffer large enough to hold contents of any section. */
7341 /* Buffer large enough to hold external relocs of any section. */
7342 void *external_relocs
;
7343 /* Buffer large enough to hold internal relocs of any section. */
7344 Elf_Internal_Rela
*internal_relocs
;
7345 /* Buffer large enough to hold external local symbols of any input
7347 bfd_byte
*external_syms
;
7348 /* And a buffer for symbol section indices. */
7349 Elf_External_Sym_Shndx
*locsym_shndx
;
7350 /* Buffer large enough to hold internal local symbols of any input
7352 Elf_Internal_Sym
*internal_syms
;
7353 /* Array large enough to hold a symbol index for each local symbol
7354 of any input BFD. */
7356 /* Array large enough to hold a section pointer for each local
7357 symbol of any input BFD. */
7358 asection
**sections
;
7359 /* Buffer to hold swapped out symbols. */
7361 /* And one for symbol section indices. */
7362 Elf_External_Sym_Shndx
*symshndxbuf
;
7363 /* Number of swapped out symbols in buffer. */
7364 size_t symbuf_count
;
7365 /* Number of symbols which fit in symbuf. */
7367 /* And same for symshndxbuf. */
7368 size_t shndxbuf_size
;
7371 /* This struct is used to pass information to elf_link_output_extsym. */
7373 struct elf_outext_info
7376 bfd_boolean localsyms
;
7377 struct elf_final_link_info
*finfo
;
7381 /* Support for evaluating a complex relocation.
7383 Complex relocations are generalized, self-describing relocations. The
7384 implementation of them consists of two parts: complex symbols, and the
7385 relocations themselves.
7387 The relocations are use a reserved elf-wide relocation type code (R_RELC
7388 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7389 information (start bit, end bit, word width, etc) into the addend. This
7390 information is extracted from CGEN-generated operand tables within gas.
7392 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7393 internal) representing prefix-notation expressions, including but not
7394 limited to those sorts of expressions normally encoded as addends in the
7395 addend field. The symbol mangling format is:
7398 | <unary-operator> ':' <node>
7399 | <binary-operator> ':' <node> ':' <node>
7402 <literal> := 's' <digits=N> ':' <N character symbol name>
7403 | 'S' <digits=N> ':' <N character section name>
7407 <binary-operator> := as in C
7408 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7411 set_symbol_value (bfd
*bfd_with_globals
,
7412 Elf_Internal_Sym
*isymbuf
,
7417 struct elf_link_hash_entry
**sym_hashes
;
7418 struct elf_link_hash_entry
*h
;
7419 size_t extsymoff
= locsymcount
;
7421 if (symidx
< locsymcount
)
7423 Elf_Internal_Sym
*sym
;
7425 sym
= isymbuf
+ symidx
;
7426 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7428 /* It is a local symbol: move it to the
7429 "absolute" section and give it a value. */
7430 sym
->st_shndx
= SHN_ABS
;
7431 sym
->st_value
= val
;
7434 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7438 /* It is a global symbol: set its link type
7439 to "defined" and give it a value. */
7441 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7442 h
= sym_hashes
[symidx
- extsymoff
];
7443 while (h
->root
.type
== bfd_link_hash_indirect
7444 || h
->root
.type
== bfd_link_hash_warning
)
7445 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7446 h
->root
.type
= bfd_link_hash_defined
;
7447 h
->root
.u
.def
.value
= val
;
7448 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7452 resolve_symbol (const char *name
,
7454 struct elf_final_link_info
*finfo
,
7456 Elf_Internal_Sym
*isymbuf
,
7459 Elf_Internal_Sym
*sym
;
7460 struct bfd_link_hash_entry
*global_entry
;
7461 const char *candidate
= NULL
;
7462 Elf_Internal_Shdr
*symtab_hdr
;
7465 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7467 for (i
= 0; i
< locsymcount
; ++ i
)
7471 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7474 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7475 symtab_hdr
->sh_link
,
7478 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7479 name
, candidate
, (unsigned long) sym
->st_value
);
7481 if (candidate
&& strcmp (candidate
, name
) == 0)
7483 asection
*sec
= finfo
->sections
[i
];
7485 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7486 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7488 printf ("Found symbol with value %8.8lx\n",
7489 (unsigned long) *result
);
7495 /* Hmm, haven't found it yet. perhaps it is a global. */
7496 global_entry
= bfd_link_hash_lookup (finfo
->info
->hash
, name
,
7497 FALSE
, FALSE
, TRUE
);
7501 if (global_entry
->type
== bfd_link_hash_defined
7502 || global_entry
->type
== bfd_link_hash_defweak
)
7504 *result
= (global_entry
->u
.def
.value
7505 + global_entry
->u
.def
.section
->output_section
->vma
7506 + global_entry
->u
.def
.section
->output_offset
);
7508 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7509 global_entry
->root
.string
, (unsigned long) *result
);
7518 resolve_section (const char *name
,
7525 for (curr
= sections
; curr
; curr
= curr
->next
)
7526 if (strcmp (curr
->name
, name
) == 0)
7528 *result
= curr
->vma
;
7532 /* Hmm. still haven't found it. try pseudo-section names. */
7533 for (curr
= sections
; curr
; curr
= curr
->next
)
7535 len
= strlen (curr
->name
);
7536 if (len
> strlen (name
))
7539 if (strncmp (curr
->name
, name
, len
) == 0)
7541 if (strncmp (".end", name
+ len
, 4) == 0)
7543 *result
= curr
->vma
+ curr
->size
;
7547 /* Insert more pseudo-section names here, if you like. */
7555 undefined_reference (const char *reftype
, const char *name
)
7557 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7562 eval_symbol (bfd_vma
*result
,
7565 struct elf_final_link_info
*finfo
,
7567 Elf_Internal_Sym
*isymbuf
,
7576 const char *sym
= *symp
;
7578 bfd_boolean symbol_is_section
= FALSE
;
7583 if (len
< 1 || len
> sizeof (symbuf
))
7585 bfd_set_error (bfd_error_invalid_operation
);
7598 *result
= strtoul (sym
, (char **) symp
, 16);
7602 symbol_is_section
= TRUE
;
7605 symlen
= strtol (sym
, (char **) symp
, 10);
7606 sym
= *symp
+ 1; /* Skip the trailing ':'. */
7608 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
7610 bfd_set_error (bfd_error_invalid_operation
);
7614 memcpy (symbuf
, sym
, symlen
);
7615 symbuf
[symlen
] = '\0';
7616 *symp
= sym
+ symlen
;
7618 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7619 the symbol as a section, or vice-versa. so we're pretty liberal in our
7620 interpretation here; section means "try section first", not "must be a
7621 section", and likewise with symbol. */
7623 if (symbol_is_section
)
7625 if (!resolve_section (symbuf
, finfo
->output_bfd
->sections
, result
)
7626 && !resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7627 isymbuf
, locsymcount
))
7629 undefined_reference ("section", symbuf
);
7635 if (!resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7636 isymbuf
, locsymcount
)
7637 && !resolve_section (symbuf
, finfo
->output_bfd
->sections
,
7640 undefined_reference ("symbol", symbuf
);
7647 /* All that remains are operators. */
7649 #define UNARY_OP(op) \
7650 if (strncmp (sym, #op, strlen (#op)) == 0) \
7652 sym += strlen (#op); \
7656 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7657 isymbuf, locsymcount, signed_p)) \
7660 *result = op ((bfd_signed_vma) a); \
7666 #define BINARY_OP(op) \
7667 if (strncmp (sym, #op, strlen (#op)) == 0) \
7669 sym += strlen (#op); \
7673 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7674 isymbuf, locsymcount, signed_p)) \
7677 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7678 isymbuf, locsymcount, signed_p)) \
7681 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7711 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
7712 bfd_set_error (bfd_error_invalid_operation
);
7718 put_value (bfd_vma size
,
7719 unsigned long chunksz
,
7724 location
+= (size
- chunksz
);
7726 for (; size
; size
-= chunksz
, location
-= chunksz
, x
>>= (chunksz
* 8))
7734 bfd_put_8 (input_bfd
, x
, location
);
7737 bfd_put_16 (input_bfd
, x
, location
);
7740 bfd_put_32 (input_bfd
, x
, location
);
7744 bfd_put_64 (input_bfd
, x
, location
);
7754 get_value (bfd_vma size
,
7755 unsigned long chunksz
,
7761 for (; size
; size
-= chunksz
, location
+= chunksz
)
7769 x
= (x
<< (8 * chunksz
)) | bfd_get_8 (input_bfd
, location
);
7772 x
= (x
<< (8 * chunksz
)) | bfd_get_16 (input_bfd
, location
);
7775 x
= (x
<< (8 * chunksz
)) | bfd_get_32 (input_bfd
, location
);
7779 x
= (x
<< (8 * chunksz
)) | bfd_get_64 (input_bfd
, location
);
7790 decode_complex_addend (unsigned long *start
, /* in bits */
7791 unsigned long *oplen
, /* in bits */
7792 unsigned long *len
, /* in bits */
7793 unsigned long *wordsz
, /* in bytes */
7794 unsigned long *chunksz
, /* in bytes */
7795 unsigned long *lsb0_p
,
7796 unsigned long *signed_p
,
7797 unsigned long *trunc_p
,
7798 unsigned long encoded
)
7800 * start
= encoded
& 0x3F;
7801 * len
= (encoded
>> 6) & 0x3F;
7802 * oplen
= (encoded
>> 12) & 0x3F;
7803 * wordsz
= (encoded
>> 18) & 0xF;
7804 * chunksz
= (encoded
>> 22) & 0xF;
7805 * lsb0_p
= (encoded
>> 27) & 1;
7806 * signed_p
= (encoded
>> 28) & 1;
7807 * trunc_p
= (encoded
>> 29) & 1;
7810 bfd_reloc_status_type
7811 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
7812 asection
*input_section ATTRIBUTE_UNUSED
,
7814 Elf_Internal_Rela
*rel
,
7817 bfd_vma shift
, x
, mask
;
7818 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
7819 bfd_reloc_status_type r
;
7821 /* Perform this reloc, since it is complex.
7822 (this is not to say that it necessarily refers to a complex
7823 symbol; merely that it is a self-describing CGEN based reloc.
7824 i.e. the addend has the complete reloc information (bit start, end,
7825 word size, etc) encoded within it.). */
7827 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
7828 &chunksz
, &lsb0_p
, &signed_p
,
7829 &trunc_p
, rel
->r_addend
);
7831 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
7834 shift
= (start
+ 1) - len
;
7836 shift
= (8 * wordsz
) - (start
+ len
);
7838 /* FIXME: octets_per_byte. */
7839 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ rel
->r_offset
);
7842 printf ("Doing complex reloc: "
7843 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7844 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7845 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7846 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
7847 oplen
, x
, mask
, relocation
);
7852 /* Now do an overflow check. */
7853 r
= bfd_check_overflow ((signed_p
7854 ? complain_overflow_signed
7855 : complain_overflow_unsigned
),
7856 len
, 0, (8 * wordsz
),
7860 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
7863 printf (" relocation: %8.8lx\n"
7864 " shifted mask: %8.8lx\n"
7865 " shifted/masked reloc: %8.8lx\n"
7866 " result: %8.8lx\n",
7867 relocation
, (mask
<< shift
),
7868 ((relocation
& mask
) << shift
), x
);
7870 /* FIXME: octets_per_byte. */
7871 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ rel
->r_offset
);
7875 /* When performing a relocatable link, the input relocations are
7876 preserved. But, if they reference global symbols, the indices
7877 referenced must be updated. Update all the relocations in
7878 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
7881 elf_link_adjust_relocs (bfd
*abfd
,
7882 Elf_Internal_Shdr
*rel_hdr
,
7884 struct elf_link_hash_entry
**rel_hash
)
7887 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7889 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7890 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7891 bfd_vma r_type_mask
;
7894 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
7896 swap_in
= bed
->s
->swap_reloc_in
;
7897 swap_out
= bed
->s
->swap_reloc_out
;
7899 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
7901 swap_in
= bed
->s
->swap_reloca_in
;
7902 swap_out
= bed
->s
->swap_reloca_out
;
7907 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
7910 if (bed
->s
->arch_size
== 32)
7917 r_type_mask
= 0xffffffff;
7921 erela
= rel_hdr
->contents
;
7922 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
7924 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
7927 if (*rel_hash
== NULL
)
7930 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
7932 (*swap_in
) (abfd
, erela
, irela
);
7933 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
7934 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
7935 | (irela
[j
].r_info
& r_type_mask
));
7936 (*swap_out
) (abfd
, irela
, erela
);
7940 struct elf_link_sort_rela
7946 enum elf_reloc_type_class type
;
7947 /* We use this as an array of size int_rels_per_ext_rel. */
7948 Elf_Internal_Rela rela
[1];
7952 elf_link_sort_cmp1 (const void *A
, const void *B
)
7954 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
7955 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
7956 int relativea
, relativeb
;
7958 relativea
= a
->type
== reloc_class_relative
;
7959 relativeb
= b
->type
== reloc_class_relative
;
7961 if (relativea
< relativeb
)
7963 if (relativea
> relativeb
)
7965 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
7967 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
7969 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
7971 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
7977 elf_link_sort_cmp2 (const void *A
, const void *B
)
7979 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
7980 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
7983 if (a
->u
.offset
< b
->u
.offset
)
7985 if (a
->u
.offset
> b
->u
.offset
)
7987 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
7988 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
7993 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
7995 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8001 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
8003 asection
*dynamic_relocs
;
8006 bfd_size_type count
, size
;
8007 size_t i
, ret
, sort_elt
, ext_size
;
8008 bfd_byte
*sort
, *s_non_relative
, *p
;
8009 struct elf_link_sort_rela
*sq
;
8010 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8011 int i2e
= bed
->s
->int_rels_per_ext_rel
;
8012 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8013 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8014 struct bfd_link_order
*lo
;
8016 bfd_boolean use_rela
;
8018 /* Find a dynamic reloc section. */
8019 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
8020 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
8021 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
8022 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8024 bfd_boolean use_rela_initialised
= FALSE
;
8026 /* This is just here to stop gcc from complaining.
8027 It's initialization checking code is not perfect. */
8030 /* Both sections are present. Examine the sizes
8031 of the indirect sections to help us choose. */
8032 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8033 if (lo
->type
== bfd_indirect_link_order
)
8035 asection
*o
= lo
->u
.indirect
.section
;
8037 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8039 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8040 /* Section size is divisible by both rel and rela sizes.
8041 It is of no help to us. */
8045 /* Section size is only divisible by rela. */
8046 if (use_rela_initialised
&& (use_rela
== FALSE
))
8049 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8050 bfd_set_error (bfd_error_invalid_operation
);
8056 use_rela_initialised
= TRUE
;
8060 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8062 /* Section size is only divisible by rel. */
8063 if (use_rela_initialised
&& (use_rela
== TRUE
))
8066 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8067 bfd_set_error (bfd_error_invalid_operation
);
8073 use_rela_initialised
= TRUE
;
8078 /* The section size is not divisible by either - something is wrong. */
8080 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8081 bfd_set_error (bfd_error_invalid_operation
);
8086 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8087 if (lo
->type
== bfd_indirect_link_order
)
8089 asection
*o
= lo
->u
.indirect
.section
;
8091 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8093 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8094 /* Section size is divisible by both rel and rela sizes.
8095 It is of no help to us. */
8099 /* Section size is only divisible by rela. */
8100 if (use_rela_initialised
&& (use_rela
== FALSE
))
8103 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8104 bfd_set_error (bfd_error_invalid_operation
);
8110 use_rela_initialised
= TRUE
;
8114 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8116 /* Section size is only divisible by rel. */
8117 if (use_rela_initialised
&& (use_rela
== TRUE
))
8120 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8121 bfd_set_error (bfd_error_invalid_operation
);
8127 use_rela_initialised
= TRUE
;
8132 /* The section size is not divisible by either - something is wrong. */
8134 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8135 bfd_set_error (bfd_error_invalid_operation
);
8140 if (! use_rela_initialised
)
8144 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
8146 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8153 dynamic_relocs
= rela_dyn
;
8154 ext_size
= bed
->s
->sizeof_rela
;
8155 swap_in
= bed
->s
->swap_reloca_in
;
8156 swap_out
= bed
->s
->swap_reloca_out
;
8160 dynamic_relocs
= rel_dyn
;
8161 ext_size
= bed
->s
->sizeof_rel
;
8162 swap_in
= bed
->s
->swap_reloc_in
;
8163 swap_out
= bed
->s
->swap_reloc_out
;
8167 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8168 if (lo
->type
== bfd_indirect_link_order
)
8169 size
+= lo
->u
.indirect
.section
->size
;
8171 if (size
!= dynamic_relocs
->size
)
8174 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8175 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8177 count
= dynamic_relocs
->size
/ ext_size
;
8180 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
8184 (*info
->callbacks
->warning
)
8185 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8189 if (bed
->s
->arch_size
== 32)
8190 r_sym_mask
= ~(bfd_vma
) 0xff;
8192 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8194 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8195 if (lo
->type
== bfd_indirect_link_order
)
8197 bfd_byte
*erel
, *erelend
;
8198 asection
*o
= lo
->u
.indirect
.section
;
8200 if (o
->contents
== NULL
&& o
->size
!= 0)
8202 /* This is a reloc section that is being handled as a normal
8203 section. See bfd_section_from_shdr. We can't combine
8204 relocs in this case. */
8209 erelend
= o
->contents
+ o
->size
;
8210 /* FIXME: octets_per_byte. */
8211 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8213 while (erel
< erelend
)
8215 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8217 (*swap_in
) (abfd
, erel
, s
->rela
);
8218 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
8219 s
->u
.sym_mask
= r_sym_mask
;
8225 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8227 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8229 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8230 if (s
->type
!= reloc_class_relative
)
8236 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8237 for (; i
< count
; i
++, p
+= sort_elt
)
8239 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8240 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8242 sp
->u
.offset
= sq
->rela
->r_offset
;
8245 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8247 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8248 if (lo
->type
== bfd_indirect_link_order
)
8250 bfd_byte
*erel
, *erelend
;
8251 asection
*o
= lo
->u
.indirect
.section
;
8254 erelend
= o
->contents
+ o
->size
;
8255 /* FIXME: octets_per_byte. */
8256 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8257 while (erel
< erelend
)
8259 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8260 (*swap_out
) (abfd
, s
->rela
, erel
);
8267 *psec
= dynamic_relocs
;
8271 /* Flush the output symbols to the file. */
8274 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
8275 const struct elf_backend_data
*bed
)
8277 if (finfo
->symbuf_count
> 0)
8279 Elf_Internal_Shdr
*hdr
;
8283 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
8284 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
8285 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8286 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
8287 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
8290 hdr
->sh_size
+= amt
;
8291 finfo
->symbuf_count
= 0;
8297 /* Add a symbol to the output symbol table. */
8300 elf_link_output_sym (struct elf_final_link_info
*finfo
,
8302 Elf_Internal_Sym
*elfsym
,
8303 asection
*input_sec
,
8304 struct elf_link_hash_entry
*h
)
8307 Elf_External_Sym_Shndx
*destshndx
;
8308 int (*output_symbol_hook
)
8309 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8310 struct elf_link_hash_entry
*);
8311 const struct elf_backend_data
*bed
;
8313 bed
= get_elf_backend_data (finfo
->output_bfd
);
8314 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8315 if (output_symbol_hook
!= NULL
)
8317 int ret
= (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
);
8322 if (name
== NULL
|| *name
== '\0')
8323 elfsym
->st_name
= 0;
8324 else if (input_sec
->flags
& SEC_EXCLUDE
)
8325 elfsym
->st_name
= 0;
8328 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
8330 if (elfsym
->st_name
== (unsigned long) -1)
8334 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
8336 if (! elf_link_flush_output_syms (finfo
, bed
))
8340 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8341 destshndx
= finfo
->symshndxbuf
;
8342 if (destshndx
!= NULL
)
8344 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
8348 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
8349 destshndx
= (Elf_External_Sym_Shndx
*) bfd_realloc (destshndx
,
8351 if (destshndx
== NULL
)
8353 finfo
->symshndxbuf
= destshndx
;
8354 memset ((char *) destshndx
+ amt
, 0, amt
);
8355 finfo
->shndxbuf_size
*= 2;
8357 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
8360 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
8361 finfo
->symbuf_count
+= 1;
8362 bfd_get_symcount (finfo
->output_bfd
) += 1;
8367 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8370 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
8372 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
8373 && sym
->st_shndx
< SHN_LORESERVE
)
8375 /* The gABI doesn't support dynamic symbols in output sections
8377 (*_bfd_error_handler
)
8378 (_("%B: Too many sections: %d (>= %d)"),
8379 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
8380 bfd_set_error (bfd_error_nonrepresentable_section
);
8386 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8387 allowing an unsatisfied unversioned symbol in the DSO to match a
8388 versioned symbol that would normally require an explicit version.
8389 We also handle the case that a DSO references a hidden symbol
8390 which may be satisfied by a versioned symbol in another DSO. */
8393 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
8394 const struct elf_backend_data
*bed
,
8395 struct elf_link_hash_entry
*h
)
8398 struct elf_link_loaded_list
*loaded
;
8400 if (!is_elf_hash_table (info
->hash
))
8403 switch (h
->root
.type
)
8409 case bfd_link_hash_undefined
:
8410 case bfd_link_hash_undefweak
:
8411 abfd
= h
->root
.u
.undef
.abfd
;
8412 if ((abfd
->flags
& DYNAMIC
) == 0
8413 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
8417 case bfd_link_hash_defined
:
8418 case bfd_link_hash_defweak
:
8419 abfd
= h
->root
.u
.def
.section
->owner
;
8422 case bfd_link_hash_common
:
8423 abfd
= h
->root
.u
.c
.p
->section
->owner
;
8426 BFD_ASSERT (abfd
!= NULL
);
8428 for (loaded
= elf_hash_table (info
)->loaded
;
8430 loaded
= loaded
->next
)
8433 Elf_Internal_Shdr
*hdr
;
8434 bfd_size_type symcount
;
8435 bfd_size_type extsymcount
;
8436 bfd_size_type extsymoff
;
8437 Elf_Internal_Shdr
*versymhdr
;
8438 Elf_Internal_Sym
*isym
;
8439 Elf_Internal_Sym
*isymend
;
8440 Elf_Internal_Sym
*isymbuf
;
8441 Elf_External_Versym
*ever
;
8442 Elf_External_Versym
*extversym
;
8444 input
= loaded
->abfd
;
8446 /* We check each DSO for a possible hidden versioned definition. */
8448 || (input
->flags
& DYNAMIC
) == 0
8449 || elf_dynversym (input
) == 0)
8452 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
8454 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8455 if (elf_bad_symtab (input
))
8457 extsymcount
= symcount
;
8462 extsymcount
= symcount
- hdr
->sh_info
;
8463 extsymoff
= hdr
->sh_info
;
8466 if (extsymcount
== 0)
8469 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
8471 if (isymbuf
== NULL
)
8474 /* Read in any version definitions. */
8475 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
8476 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
8477 if (extversym
== NULL
)
8480 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
8481 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
8482 != versymhdr
->sh_size
))
8490 ever
= extversym
+ extsymoff
;
8491 isymend
= isymbuf
+ extsymcount
;
8492 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
8495 Elf_Internal_Versym iver
;
8496 unsigned short version_index
;
8498 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
8499 || isym
->st_shndx
== SHN_UNDEF
)
8502 name
= bfd_elf_string_from_elf_section (input
,
8505 if (strcmp (name
, h
->root
.root
.string
) != 0)
8508 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
8510 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
8512 && h
->forced_local
))
8514 /* If we have a non-hidden versioned sym, then it should
8515 have provided a definition for the undefined sym unless
8516 it is defined in a non-shared object and forced local.
8521 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
8522 if (version_index
== 1 || version_index
== 2)
8524 /* This is the base or first version. We can use it. */
8538 /* Add an external symbol to the symbol table. This is called from
8539 the hash table traversal routine. When generating a shared object,
8540 we go through the symbol table twice. The first time we output
8541 anything that might have been forced to local scope in a version
8542 script. The second time we output the symbols that are still
8546 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
8548 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
8549 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
8551 Elf_Internal_Sym sym
;
8552 asection
*input_sec
;
8553 const struct elf_backend_data
*bed
;
8557 if (h
->root
.type
== bfd_link_hash_warning
)
8559 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8560 if (h
->root
.type
== bfd_link_hash_new
)
8564 /* Decide whether to output this symbol in this pass. */
8565 if (eoinfo
->localsyms
)
8567 if (!h
->forced_local
)
8572 if (h
->forced_local
)
8576 bed
= get_elf_backend_data (finfo
->output_bfd
);
8578 if (h
->root
.type
== bfd_link_hash_undefined
)
8580 /* If we have an undefined symbol reference here then it must have
8581 come from a shared library that is being linked in. (Undefined
8582 references in regular files have already been handled). */
8583 bfd_boolean ignore_undef
= FALSE
;
8585 /* Some symbols may be special in that the fact that they're
8586 undefined can be safely ignored - let backend determine that. */
8587 if (bed
->elf_backend_ignore_undef_symbol
)
8588 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
8590 /* If we are reporting errors for this situation then do so now. */
8591 if (ignore_undef
== FALSE
8594 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
8595 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
8597 if (! (finfo
->info
->callbacks
->undefined_symbol
8598 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
8599 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
8601 eoinfo
->failed
= TRUE
;
8607 /* We should also warn if a forced local symbol is referenced from
8608 shared libraries. */
8609 if (! finfo
->info
->relocatable
8610 && (! finfo
->info
->shared
)
8615 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
8617 (*_bfd_error_handler
)
8618 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
8620 h
->root
.u
.def
.section
== bfd_abs_section_ptr
8621 ? finfo
->output_bfd
: h
->root
.u
.def
.section
->owner
,
8622 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
8624 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
8625 ? "hidden" : "local",
8626 h
->root
.root
.string
);
8627 eoinfo
->failed
= TRUE
;
8631 /* We don't want to output symbols that have never been mentioned by
8632 a regular file, or that we have been told to strip. However, if
8633 h->indx is set to -2, the symbol is used by a reloc and we must
8637 else if ((h
->def_dynamic
8639 || h
->root
.type
== bfd_link_hash_new
)
8643 else if (finfo
->info
->strip
== strip_all
)
8645 else if (finfo
->info
->strip
== strip_some
8646 && bfd_hash_lookup (finfo
->info
->keep_hash
,
8647 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
8649 else if (finfo
->info
->strip_discarded
8650 && (h
->root
.type
== bfd_link_hash_defined
8651 || h
->root
.type
== bfd_link_hash_defweak
)
8652 && elf_discarded_section (h
->root
.u
.def
.section
))
8657 /* If we're stripping it, and it's not a dynamic symbol, there's
8658 nothing else to do unless it is a forced local symbol or a
8659 STT_GNU_IFUNC symbol. */
8662 && h
->type
!= STT_GNU_IFUNC
8663 && !h
->forced_local
)
8667 sym
.st_size
= h
->size
;
8668 sym
.st_other
= h
->other
;
8669 if (h
->forced_local
)
8671 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
8672 /* Turn off visibility on local symbol. */
8673 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
8675 else if (h
->unique_global
)
8676 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, h
->type
);
8677 else if (h
->root
.type
== bfd_link_hash_undefweak
8678 || h
->root
.type
== bfd_link_hash_defweak
)
8679 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
8681 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
8683 switch (h
->root
.type
)
8686 case bfd_link_hash_new
:
8687 case bfd_link_hash_warning
:
8691 case bfd_link_hash_undefined
:
8692 case bfd_link_hash_undefweak
:
8693 input_sec
= bfd_und_section_ptr
;
8694 sym
.st_shndx
= SHN_UNDEF
;
8697 case bfd_link_hash_defined
:
8698 case bfd_link_hash_defweak
:
8700 input_sec
= h
->root
.u
.def
.section
;
8701 if (input_sec
->output_section
!= NULL
)
8704 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
8705 input_sec
->output_section
);
8706 if (sym
.st_shndx
== SHN_BAD
)
8708 (*_bfd_error_handler
)
8709 (_("%B: could not find output section %A for input section %A"),
8710 finfo
->output_bfd
, input_sec
->output_section
, input_sec
);
8711 eoinfo
->failed
= TRUE
;
8715 /* ELF symbols in relocatable files are section relative,
8716 but in nonrelocatable files they are virtual
8718 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
8719 if (! finfo
->info
->relocatable
)
8721 sym
.st_value
+= input_sec
->output_section
->vma
;
8722 if (h
->type
== STT_TLS
)
8724 asection
*tls_sec
= elf_hash_table (finfo
->info
)->tls_sec
;
8725 if (tls_sec
!= NULL
)
8726 sym
.st_value
-= tls_sec
->vma
;
8729 /* The TLS section may have been garbage collected. */
8730 BFD_ASSERT (finfo
->info
->gc_sections
8731 && !input_sec
->gc_mark
);
8738 BFD_ASSERT (input_sec
->owner
== NULL
8739 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
8740 sym
.st_shndx
= SHN_UNDEF
;
8741 input_sec
= bfd_und_section_ptr
;
8746 case bfd_link_hash_common
:
8747 input_sec
= h
->root
.u
.c
.p
->section
;
8748 sym
.st_shndx
= bed
->common_section_index (input_sec
);
8749 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
8752 case bfd_link_hash_indirect
:
8753 /* These symbols are created by symbol versioning. They point
8754 to the decorated version of the name. For example, if the
8755 symbol foo@@GNU_1.2 is the default, which should be used when
8756 foo is used with no version, then we add an indirect symbol
8757 foo which points to foo@@GNU_1.2. We ignore these symbols,
8758 since the indirected symbol is already in the hash table. */
8762 /* Give the processor backend a chance to tweak the symbol value,
8763 and also to finish up anything that needs to be done for this
8764 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8765 forced local syms when non-shared is due to a historical quirk.
8766 STT_GNU_IFUNC symbol must go through PLT. */
8767 if ((h
->type
== STT_GNU_IFUNC
8769 && !finfo
->info
->relocatable
)
8770 || ((h
->dynindx
!= -1
8772 && ((finfo
->info
->shared
8773 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
8774 || h
->root
.type
!= bfd_link_hash_undefweak
))
8775 || !h
->forced_local
)
8776 && elf_hash_table (finfo
->info
)->dynamic_sections_created
))
8778 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
8779 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
8781 eoinfo
->failed
= TRUE
;
8786 /* If we are marking the symbol as undefined, and there are no
8787 non-weak references to this symbol from a regular object, then
8788 mark the symbol as weak undefined; if there are non-weak
8789 references, mark the symbol as strong. We can't do this earlier,
8790 because it might not be marked as undefined until the
8791 finish_dynamic_symbol routine gets through with it. */
8792 if (sym
.st_shndx
== SHN_UNDEF
8794 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
8795 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
8798 unsigned int type
= ELF_ST_TYPE (sym
.st_info
);
8800 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8801 if (type
== STT_GNU_IFUNC
)
8804 if (h
->ref_regular_nonweak
)
8805 bindtype
= STB_GLOBAL
;
8807 bindtype
= STB_WEAK
;
8808 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
8811 /* If this is a symbol defined in a dynamic library, don't use the
8812 symbol size from the dynamic library. Relinking an executable
8813 against a new library may introduce gratuitous changes in the
8814 executable's symbols if we keep the size. */
8815 if (sym
.st_shndx
== SHN_UNDEF
8820 /* If a non-weak symbol with non-default visibility is not defined
8821 locally, it is a fatal error. */
8822 if (! finfo
->info
->relocatable
8823 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
8824 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
8825 && h
->root
.type
== bfd_link_hash_undefined
8828 (*_bfd_error_handler
)
8829 (_("%B: %s symbol `%s' isn't defined"),
8831 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
8833 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
8834 ? "internal" : "hidden",
8835 h
->root
.root
.string
);
8836 eoinfo
->failed
= TRUE
;
8840 /* If this symbol should be put in the .dynsym section, then put it
8841 there now. We already know the symbol index. We also fill in
8842 the entry in the .hash section. */
8843 if (h
->dynindx
!= -1
8844 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8848 sym
.st_name
= h
->dynstr_index
;
8849 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
8850 if (! check_dynsym (finfo
->output_bfd
, &sym
))
8852 eoinfo
->failed
= TRUE
;
8855 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
8857 if (finfo
->hash_sec
!= NULL
)
8859 size_t hash_entry_size
;
8860 bfd_byte
*bucketpos
;
8865 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
8866 bucket
= h
->u
.elf_hash_value
% bucketcount
;
8869 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
8870 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
8871 + (bucket
+ 2) * hash_entry_size
);
8872 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
8873 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
8874 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
8875 ((bfd_byte
*) finfo
->hash_sec
->contents
8876 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
8879 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
8881 Elf_Internal_Versym iversym
;
8882 Elf_External_Versym
*eversym
;
8884 if (!h
->def_regular
)
8886 if (h
->verinfo
.verdef
== NULL
)
8887 iversym
.vs_vers
= 0;
8889 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
8893 if (h
->verinfo
.vertree
== NULL
)
8894 iversym
.vs_vers
= 1;
8896 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
8897 if (finfo
->info
->create_default_symver
)
8902 iversym
.vs_vers
|= VERSYM_HIDDEN
;
8904 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
8905 eversym
+= h
->dynindx
;
8906 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
8910 /* If we're stripping it, then it was just a dynamic symbol, and
8911 there's nothing else to do. */
8912 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
8915 indx
= bfd_get_symcount (finfo
->output_bfd
);
8916 ret
= elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
);
8919 eoinfo
->failed
= TRUE
;
8924 else if (h
->indx
== -2)
8930 /* Return TRUE if special handling is done for relocs in SEC against
8931 symbols defined in discarded sections. */
8934 elf_section_ignore_discarded_relocs (asection
*sec
)
8936 const struct elf_backend_data
*bed
;
8938 switch (sec
->sec_info_type
)
8940 case ELF_INFO_TYPE_STABS
:
8941 case ELF_INFO_TYPE_EH_FRAME
:
8947 bed
= get_elf_backend_data (sec
->owner
);
8948 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8949 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
8955 /* Return a mask saying how ld should treat relocations in SEC against
8956 symbols defined in discarded sections. If this function returns
8957 COMPLAIN set, ld will issue a warning message. If this function
8958 returns PRETEND set, and the discarded section was link-once and the
8959 same size as the kept link-once section, ld will pretend that the
8960 symbol was actually defined in the kept section. Otherwise ld will
8961 zero the reloc (at least that is the intent, but some cooperation by
8962 the target dependent code is needed, particularly for REL targets). */
8965 _bfd_elf_default_action_discarded (asection
*sec
)
8967 if (sec
->flags
& SEC_DEBUGGING
)
8970 if (strcmp (".eh_frame", sec
->name
) == 0)
8973 if (strcmp (".gcc_except_table", sec
->name
) == 0)
8976 return COMPLAIN
| PRETEND
;
8979 /* Find a match between a section and a member of a section group. */
8982 match_group_member (asection
*sec
, asection
*group
,
8983 struct bfd_link_info
*info
)
8985 asection
*first
= elf_next_in_group (group
);
8986 asection
*s
= first
;
8990 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
8993 s
= elf_next_in_group (s
);
9001 /* Check if the kept section of a discarded section SEC can be used
9002 to replace it. Return the replacement if it is OK. Otherwise return
9006 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
9010 kept
= sec
->kept_section
;
9013 if ((kept
->flags
& SEC_GROUP
) != 0)
9014 kept
= match_group_member (sec
, kept
, info
);
9016 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
9017 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
9019 sec
->kept_section
= kept
;
9024 /* Link an input file into the linker output file. This function
9025 handles all the sections and relocations of the input file at once.
9026 This is so that we only have to read the local symbols once, and
9027 don't have to keep them in memory. */
9030 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
9032 int (*relocate_section
)
9033 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
9034 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
9036 Elf_Internal_Shdr
*symtab_hdr
;
9039 Elf_Internal_Sym
*isymbuf
;
9040 Elf_Internal_Sym
*isym
;
9041 Elf_Internal_Sym
*isymend
;
9043 asection
**ppsection
;
9045 const struct elf_backend_data
*bed
;
9046 struct elf_link_hash_entry
**sym_hashes
;
9048 output_bfd
= finfo
->output_bfd
;
9049 bed
= get_elf_backend_data (output_bfd
);
9050 relocate_section
= bed
->elf_backend_relocate_section
;
9052 /* If this is a dynamic object, we don't want to do anything here:
9053 we don't want the local symbols, and we don't want the section
9055 if ((input_bfd
->flags
& DYNAMIC
) != 0)
9058 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
9059 if (elf_bad_symtab (input_bfd
))
9061 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9066 locsymcount
= symtab_hdr
->sh_info
;
9067 extsymoff
= symtab_hdr
->sh_info
;
9070 /* Read the local symbols. */
9071 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9072 if (isymbuf
== NULL
&& locsymcount
!= 0)
9074 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
9075 finfo
->internal_syms
,
9076 finfo
->external_syms
,
9077 finfo
->locsym_shndx
);
9078 if (isymbuf
== NULL
)
9082 /* Find local symbol sections and adjust values of symbols in
9083 SEC_MERGE sections. Write out those local symbols we know are
9084 going into the output file. */
9085 isymend
= isymbuf
+ locsymcount
;
9086 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
9088 isym
++, pindex
++, ppsection
++)
9092 Elf_Internal_Sym osym
;
9098 if (elf_bad_symtab (input_bfd
))
9100 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
9107 if (isym
->st_shndx
== SHN_UNDEF
)
9108 isec
= bfd_und_section_ptr
;
9109 else if (isym
->st_shndx
== SHN_ABS
)
9110 isec
= bfd_abs_section_ptr
;
9111 else if (isym
->st_shndx
== SHN_COMMON
)
9112 isec
= bfd_com_section_ptr
;
9115 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
9118 /* Don't attempt to output symbols with st_shnx in the
9119 reserved range other than SHN_ABS and SHN_COMMON. */
9123 else if (isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
9124 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
9126 _bfd_merged_section_offset (output_bfd
, &isec
,
9127 elf_section_data (isec
)->sec_info
,
9133 /* Don't output the first, undefined, symbol. */
9134 if (ppsection
== finfo
->sections
)
9137 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
9139 /* We never output section symbols. Instead, we use the
9140 section symbol of the corresponding section in the output
9145 /* If we are stripping all symbols, we don't want to output this
9147 if (finfo
->info
->strip
== strip_all
)
9150 /* If we are discarding all local symbols, we don't want to
9151 output this one. If we are generating a relocatable output
9152 file, then some of the local symbols may be required by
9153 relocs; we output them below as we discover that they are
9155 if (finfo
->info
->discard
== discard_all
)
9158 /* If this symbol is defined in a section which we are
9159 discarding, we don't need to keep it. */
9160 if (isym
->st_shndx
!= SHN_UNDEF
9161 && isym
->st_shndx
< SHN_LORESERVE
9162 && bfd_section_removed_from_list (output_bfd
,
9163 isec
->output_section
))
9166 /* Get the name of the symbol. */
9167 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
9172 /* See if we are discarding symbols with this name. */
9173 if ((finfo
->info
->strip
== strip_some
9174 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
9176 || (((finfo
->info
->discard
== discard_sec_merge
9177 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
9178 || finfo
->info
->discard
== discard_l
)
9179 && bfd_is_local_label_name (input_bfd
, name
)))
9184 /* Adjust the section index for the output file. */
9185 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9186 isec
->output_section
);
9187 if (osym
.st_shndx
== SHN_BAD
)
9190 /* ELF symbols in relocatable files are section relative, but
9191 in executable files they are virtual addresses. Note that
9192 this code assumes that all ELF sections have an associated
9193 BFD section with a reasonable value for output_offset; below
9194 we assume that they also have a reasonable value for
9195 output_section. Any special sections must be set up to meet
9196 these requirements. */
9197 osym
.st_value
+= isec
->output_offset
;
9198 if (! finfo
->info
->relocatable
)
9200 osym
.st_value
+= isec
->output_section
->vma
;
9201 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
9203 /* STT_TLS symbols are relative to PT_TLS segment base. */
9204 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
9205 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
9209 indx
= bfd_get_symcount (output_bfd
);
9210 ret
= elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
);
9217 /* Relocate the contents of each section. */
9218 sym_hashes
= elf_sym_hashes (input_bfd
);
9219 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
9223 if (! o
->linker_mark
)
9225 /* This section was omitted from the link. */
9229 if (finfo
->info
->relocatable
9230 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
9232 /* Deal with the group signature symbol. */
9233 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
9234 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
9235 asection
*osec
= o
->output_section
;
9237 if (symndx
>= locsymcount
9238 || (elf_bad_symtab (input_bfd
)
9239 && finfo
->sections
[symndx
] == NULL
))
9241 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
9242 while (h
->root
.type
== bfd_link_hash_indirect
9243 || h
->root
.type
== bfd_link_hash_warning
)
9244 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9245 /* Arrange for symbol to be output. */
9247 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
9249 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
9251 /* We'll use the output section target_index. */
9252 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9253 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
9257 if (finfo
->indices
[symndx
] == -1)
9259 /* Otherwise output the local symbol now. */
9260 Elf_Internal_Sym sym
= isymbuf
[symndx
];
9261 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9266 name
= bfd_elf_string_from_elf_section (input_bfd
,
9267 symtab_hdr
->sh_link
,
9272 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9274 if (sym
.st_shndx
== SHN_BAD
)
9277 sym
.st_value
+= o
->output_offset
;
9279 indx
= bfd_get_symcount (output_bfd
);
9280 ret
= elf_link_output_sym (finfo
, name
, &sym
, o
, NULL
);
9284 finfo
->indices
[symndx
] = indx
;
9288 elf_section_data (osec
)->this_hdr
.sh_info
9289 = finfo
->indices
[symndx
];
9293 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
9294 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
9297 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
9299 /* Section was created by _bfd_elf_link_create_dynamic_sections
9304 /* Get the contents of the section. They have been cached by a
9305 relaxation routine. Note that o is a section in an input
9306 file, so the contents field will not have been set by any of
9307 the routines which work on output files. */
9308 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
9309 contents
= elf_section_data (o
)->this_hdr
.contents
;
9312 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
9314 contents
= finfo
->contents
;
9315 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
9319 if ((o
->flags
& SEC_RELOC
) != 0)
9321 Elf_Internal_Rela
*internal_relocs
;
9322 Elf_Internal_Rela
*rel
, *relend
;
9323 bfd_vma r_type_mask
;
9325 int action_discarded
;
9328 /* Get the swapped relocs. */
9330 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
9331 finfo
->internal_relocs
, FALSE
);
9332 if (internal_relocs
== NULL
9333 && o
->reloc_count
> 0)
9336 if (bed
->s
->arch_size
== 32)
9343 r_type_mask
= 0xffffffff;
9347 action_discarded
= -1;
9348 if (!elf_section_ignore_discarded_relocs (o
))
9349 action_discarded
= (*bed
->action_discarded
) (o
);
9351 /* Run through the relocs evaluating complex reloc symbols and
9352 looking for relocs against symbols from discarded sections
9353 or section symbols from removed link-once sections.
9354 Complain about relocs against discarded sections. Zero
9355 relocs against removed link-once sections. */
9357 rel
= internal_relocs
;
9358 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9359 for ( ; rel
< relend
; rel
++)
9361 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
9362 unsigned int s_type
;
9363 asection
**ps
, *sec
;
9364 struct elf_link_hash_entry
*h
= NULL
;
9365 const char *sym_name
;
9367 if (r_symndx
== STN_UNDEF
)
9370 if (r_symndx
>= locsymcount
9371 || (elf_bad_symtab (input_bfd
)
9372 && finfo
->sections
[r_symndx
] == NULL
))
9374 h
= sym_hashes
[r_symndx
- extsymoff
];
9376 /* Badly formatted input files can contain relocs that
9377 reference non-existant symbols. Check here so that
9378 we do not seg fault. */
9383 sprintf_vma (buffer
, rel
->r_info
);
9384 (*_bfd_error_handler
)
9385 (_("error: %B contains a reloc (0x%s) for section %A "
9386 "that references a non-existent global symbol"),
9387 input_bfd
, o
, buffer
);
9388 bfd_set_error (bfd_error_bad_value
);
9392 while (h
->root
.type
== bfd_link_hash_indirect
9393 || h
->root
.type
== bfd_link_hash_warning
)
9394 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9399 if (h
->root
.type
== bfd_link_hash_defined
9400 || h
->root
.type
== bfd_link_hash_defweak
)
9401 ps
= &h
->root
.u
.def
.section
;
9403 sym_name
= h
->root
.root
.string
;
9407 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
9409 s_type
= ELF_ST_TYPE (sym
->st_info
);
9410 ps
= &finfo
->sections
[r_symndx
];
9411 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
9415 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
9416 && !finfo
->info
->relocatable
)
9419 bfd_vma dot
= (rel
->r_offset
9420 + o
->output_offset
+ o
->output_section
->vma
);
9422 printf ("Encountered a complex symbol!");
9423 printf (" (input_bfd %s, section %s, reloc %ld\n",
9424 input_bfd
->filename
, o
->name
, rel
- internal_relocs
);
9425 printf (" symbol: idx %8.8lx, name %s\n",
9426 r_symndx
, sym_name
);
9427 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9428 (unsigned long) rel
->r_info
,
9429 (unsigned long) rel
->r_offset
);
9431 if (!eval_symbol (&val
, &sym_name
, input_bfd
, finfo
, dot
,
9432 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
9435 /* Symbol evaluated OK. Update to absolute value. */
9436 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
9441 if (action_discarded
!= -1 && ps
!= NULL
)
9443 /* Complain if the definition comes from a
9444 discarded section. */
9445 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
9447 BFD_ASSERT (r_symndx
!= 0);
9448 if (action_discarded
& COMPLAIN
)
9449 (*finfo
->info
->callbacks
->einfo
)
9450 (_("%X`%s' referenced in section `%A' of %B: "
9451 "defined in discarded section `%A' of %B\n"),
9452 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
9454 /* Try to do the best we can to support buggy old
9455 versions of gcc. Pretend that the symbol is
9456 really defined in the kept linkonce section.
9457 FIXME: This is quite broken. Modifying the
9458 symbol here means we will be changing all later
9459 uses of the symbol, not just in this section. */
9460 if (action_discarded
& PRETEND
)
9464 kept
= _bfd_elf_check_kept_section (sec
,
9476 /* Relocate the section by invoking a back end routine.
9478 The back end routine is responsible for adjusting the
9479 section contents as necessary, and (if using Rela relocs
9480 and generating a relocatable output file) adjusting the
9481 reloc addend as necessary.
9483 The back end routine does not have to worry about setting
9484 the reloc address or the reloc symbol index.
9486 The back end routine is given a pointer to the swapped in
9487 internal symbols, and can access the hash table entries
9488 for the external symbols via elf_sym_hashes (input_bfd).
9490 When generating relocatable output, the back end routine
9491 must handle STB_LOCAL/STT_SECTION symbols specially. The
9492 output symbol is going to be a section symbol
9493 corresponding to the output section, which will require
9494 the addend to be adjusted. */
9496 ret
= (*relocate_section
) (output_bfd
, finfo
->info
,
9497 input_bfd
, o
, contents
,
9505 || finfo
->info
->relocatable
9506 || finfo
->info
->emitrelocations
)
9508 Elf_Internal_Rela
*irela
;
9509 Elf_Internal_Rela
*irelaend
;
9510 bfd_vma last_offset
;
9511 struct elf_link_hash_entry
**rel_hash
;
9512 struct elf_link_hash_entry
**rel_hash_list
;
9513 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
9514 unsigned int next_erel
;
9515 bfd_boolean rela_normal
;
9517 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
9518 rela_normal
= (bed
->rela_normal
9519 && (input_rel_hdr
->sh_entsize
9520 == bed
->s
->sizeof_rela
));
9522 /* Adjust the reloc addresses and symbol indices. */
9524 irela
= internal_relocs
;
9525 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9526 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
9527 + elf_section_data (o
->output_section
)->rel_count
9528 + elf_section_data (o
->output_section
)->rel_count2
);
9529 rel_hash_list
= rel_hash
;
9530 last_offset
= o
->output_offset
;
9531 if (!finfo
->info
->relocatable
)
9532 last_offset
+= o
->output_section
->vma
;
9533 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
9535 unsigned long r_symndx
;
9537 Elf_Internal_Sym sym
;
9539 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
9545 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
9548 if (irela
->r_offset
>= (bfd_vma
) -2)
9550 /* This is a reloc for a deleted entry or somesuch.
9551 Turn it into an R_*_NONE reloc, at the same
9552 offset as the last reloc. elf_eh_frame.c and
9553 bfd_elf_discard_info rely on reloc offsets
9555 irela
->r_offset
= last_offset
;
9557 irela
->r_addend
= 0;
9561 irela
->r_offset
+= o
->output_offset
;
9563 /* Relocs in an executable have to be virtual addresses. */
9564 if (!finfo
->info
->relocatable
)
9565 irela
->r_offset
+= o
->output_section
->vma
;
9567 last_offset
= irela
->r_offset
;
9569 r_symndx
= irela
->r_info
>> r_sym_shift
;
9570 if (r_symndx
== STN_UNDEF
)
9573 if (r_symndx
>= locsymcount
9574 || (elf_bad_symtab (input_bfd
)
9575 && finfo
->sections
[r_symndx
] == NULL
))
9577 struct elf_link_hash_entry
*rh
;
9580 /* This is a reloc against a global symbol. We
9581 have not yet output all the local symbols, so
9582 we do not know the symbol index of any global
9583 symbol. We set the rel_hash entry for this
9584 reloc to point to the global hash table entry
9585 for this symbol. The symbol index is then
9586 set at the end of bfd_elf_final_link. */
9587 indx
= r_symndx
- extsymoff
;
9588 rh
= elf_sym_hashes (input_bfd
)[indx
];
9589 while (rh
->root
.type
== bfd_link_hash_indirect
9590 || rh
->root
.type
== bfd_link_hash_warning
)
9591 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
9593 /* Setting the index to -2 tells
9594 elf_link_output_extsym that this symbol is
9596 BFD_ASSERT (rh
->indx
< 0);
9604 /* This is a reloc against a local symbol. */
9607 sym
= isymbuf
[r_symndx
];
9608 sec
= finfo
->sections
[r_symndx
];
9609 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
9611 /* I suppose the backend ought to fill in the
9612 section of any STT_SECTION symbol against a
9613 processor specific section. */
9615 if (bfd_is_abs_section (sec
))
9617 else if (sec
== NULL
|| sec
->owner
== NULL
)
9619 bfd_set_error (bfd_error_bad_value
);
9624 asection
*osec
= sec
->output_section
;
9626 /* If we have discarded a section, the output
9627 section will be the absolute section. In
9628 case of discarded SEC_MERGE sections, use
9629 the kept section. relocate_section should
9630 have already handled discarded linkonce
9632 if (bfd_is_abs_section (osec
)
9633 && sec
->kept_section
!= NULL
9634 && sec
->kept_section
->output_section
!= NULL
)
9636 osec
= sec
->kept_section
->output_section
;
9637 irela
->r_addend
-= osec
->vma
;
9640 if (!bfd_is_abs_section (osec
))
9642 r_symndx
= osec
->target_index
;
9645 struct elf_link_hash_table
*htab
;
9648 htab
= elf_hash_table (finfo
->info
);
9649 oi
= htab
->text_index_section
;
9650 if ((osec
->flags
& SEC_READONLY
) == 0
9651 && htab
->data_index_section
!= NULL
)
9652 oi
= htab
->data_index_section
;
9656 irela
->r_addend
+= osec
->vma
- oi
->vma
;
9657 r_symndx
= oi
->target_index
;
9661 BFD_ASSERT (r_symndx
!= 0);
9665 /* Adjust the addend according to where the
9666 section winds up in the output section. */
9668 irela
->r_addend
+= sec
->output_offset
;
9672 if (finfo
->indices
[r_symndx
] == -1)
9674 unsigned long shlink
;
9679 if (finfo
->info
->strip
== strip_all
)
9681 /* You can't do ld -r -s. */
9682 bfd_set_error (bfd_error_invalid_operation
);
9686 /* This symbol was skipped earlier, but
9687 since it is needed by a reloc, we
9688 must output it now. */
9689 shlink
= symtab_hdr
->sh_link
;
9690 name
= (bfd_elf_string_from_elf_section
9691 (input_bfd
, shlink
, sym
.st_name
));
9695 osec
= sec
->output_section
;
9697 _bfd_elf_section_from_bfd_section (output_bfd
,
9699 if (sym
.st_shndx
== SHN_BAD
)
9702 sym
.st_value
+= sec
->output_offset
;
9703 if (! finfo
->info
->relocatable
)
9705 sym
.st_value
+= osec
->vma
;
9706 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
9708 /* STT_TLS symbols are relative to PT_TLS
9710 BFD_ASSERT (elf_hash_table (finfo
->info
)
9712 sym
.st_value
-= (elf_hash_table (finfo
->info
)
9717 indx
= bfd_get_symcount (output_bfd
);
9718 ret
= elf_link_output_sym (finfo
, name
, &sym
, sec
,
9723 finfo
->indices
[r_symndx
] = indx
;
9728 r_symndx
= finfo
->indices
[r_symndx
];
9731 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
9732 | (irela
->r_info
& r_type_mask
));
9735 /* Swap out the relocs. */
9736 if (input_rel_hdr
->sh_size
!= 0
9737 && !bed
->elf_backend_emit_relocs (output_bfd
, o
,
9743 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
9744 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
9746 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
9747 * bed
->s
->int_rels_per_ext_rel
);
9748 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
9749 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9758 /* Write out the modified section contents. */
9759 if (bed
->elf_backend_write_section
9760 && (*bed
->elf_backend_write_section
) (output_bfd
, finfo
->info
, o
,
9763 /* Section written out. */
9765 else switch (o
->sec_info_type
)
9767 case ELF_INFO_TYPE_STABS
:
9768 if (! (_bfd_write_section_stabs
9770 &elf_hash_table (finfo
->info
)->stab_info
,
9771 o
, &elf_section_data (o
)->sec_info
, contents
)))
9774 case ELF_INFO_TYPE_MERGE
:
9775 if (! _bfd_write_merged_section (output_bfd
, o
,
9776 elf_section_data (o
)->sec_info
))
9779 case ELF_INFO_TYPE_EH_FRAME
:
9781 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
9788 /* FIXME: octets_per_byte. */
9789 if (! (o
->flags
& SEC_EXCLUDE
)
9790 && ! (o
->output_section
->flags
& SEC_NEVER_LOAD
)
9791 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
9793 (file_ptr
) o
->output_offset
,
9804 /* Generate a reloc when linking an ELF file. This is a reloc
9805 requested by the linker, and does not come from any input file. This
9806 is used to build constructor and destructor tables when linking
9810 elf_reloc_link_order (bfd
*output_bfd
,
9811 struct bfd_link_info
*info
,
9812 asection
*output_section
,
9813 struct bfd_link_order
*link_order
)
9815 reloc_howto_type
*howto
;
9819 struct elf_link_hash_entry
**rel_hash_ptr
;
9820 Elf_Internal_Shdr
*rel_hdr
;
9821 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
9822 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
9826 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
9829 bfd_set_error (bfd_error_bad_value
);
9833 addend
= link_order
->u
.reloc
.p
->addend
;
9835 /* Figure out the symbol index. */
9836 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
9837 + elf_section_data (output_section
)->rel_count
9838 + elf_section_data (output_section
)->rel_count2
);
9839 if (link_order
->type
== bfd_section_reloc_link_order
)
9841 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
9842 BFD_ASSERT (indx
!= 0);
9843 *rel_hash_ptr
= NULL
;
9847 struct elf_link_hash_entry
*h
;
9849 /* Treat a reloc against a defined symbol as though it were
9850 actually against the section. */
9851 h
= ((struct elf_link_hash_entry
*)
9852 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
9853 link_order
->u
.reloc
.p
->u
.name
,
9854 FALSE
, FALSE
, TRUE
));
9856 && (h
->root
.type
== bfd_link_hash_defined
9857 || h
->root
.type
== bfd_link_hash_defweak
))
9861 section
= h
->root
.u
.def
.section
;
9862 indx
= section
->output_section
->target_index
;
9863 *rel_hash_ptr
= NULL
;
9864 /* It seems that we ought to add the symbol value to the
9865 addend here, but in practice it has already been added
9866 because it was passed to constructor_callback. */
9867 addend
+= section
->output_section
->vma
+ section
->output_offset
;
9871 /* Setting the index to -2 tells elf_link_output_extsym that
9872 this symbol is used by a reloc. */
9879 if (! ((*info
->callbacks
->unattached_reloc
)
9880 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
9886 /* If this is an inplace reloc, we must write the addend into the
9888 if (howto
->partial_inplace
&& addend
!= 0)
9891 bfd_reloc_status_type rstat
;
9894 const char *sym_name
;
9896 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
9897 buf
= (bfd_byte
*) bfd_zmalloc (size
);
9900 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
9907 case bfd_reloc_outofrange
:
9910 case bfd_reloc_overflow
:
9911 if (link_order
->type
== bfd_section_reloc_link_order
)
9912 sym_name
= bfd_section_name (output_bfd
,
9913 link_order
->u
.reloc
.p
->u
.section
);
9915 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
9916 if (! ((*info
->callbacks
->reloc_overflow
)
9917 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
9918 NULL
, (bfd_vma
) 0)))
9925 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
9926 link_order
->offset
, size
);
9932 /* The address of a reloc is relative to the section in a
9933 relocatable file, and is a virtual address in an executable
9935 offset
= link_order
->offset
;
9936 if (! info
->relocatable
)
9937 offset
+= output_section
->vma
;
9939 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
9941 irel
[i
].r_offset
= offset
;
9943 irel
[i
].r_addend
= 0;
9945 if (bed
->s
->arch_size
== 32)
9946 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
9948 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
9950 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
9951 erel
= rel_hdr
->contents
;
9952 if (rel_hdr
->sh_type
== SHT_REL
)
9954 erel
+= (elf_section_data (output_section
)->rel_count
9955 * bed
->s
->sizeof_rel
);
9956 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
9960 irel
[0].r_addend
= addend
;
9961 erel
+= (elf_section_data (output_section
)->rel_count
9962 * bed
->s
->sizeof_rela
);
9963 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
9966 ++elf_section_data (output_section
)->rel_count
;
9972 /* Get the output vma of the section pointed to by the sh_link field. */
9975 elf_get_linked_section_vma (struct bfd_link_order
*p
)
9977 Elf_Internal_Shdr
**elf_shdrp
;
9981 s
= p
->u
.indirect
.section
;
9982 elf_shdrp
= elf_elfsections (s
->owner
);
9983 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
9984 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
9986 The Intel C compiler generates SHT_IA_64_UNWIND with
9987 SHF_LINK_ORDER. But it doesn't set the sh_link or
9988 sh_info fields. Hence we could get the situation
9989 where elfsec is 0. */
9992 const struct elf_backend_data
*bed
9993 = get_elf_backend_data (s
->owner
);
9994 if (bed
->link_order_error_handler
)
9995 bed
->link_order_error_handler
9996 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
10001 s
= elf_shdrp
[elfsec
]->bfd_section
;
10002 return s
->output_section
->vma
+ s
->output_offset
;
10007 /* Compare two sections based on the locations of the sections they are
10008 linked to. Used by elf_fixup_link_order. */
10011 compare_link_order (const void * a
, const void * b
)
10016 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
10017 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
10020 return apos
> bpos
;
10024 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10025 order as their linked sections. Returns false if this could not be done
10026 because an output section includes both ordered and unordered
10027 sections. Ideally we'd do this in the linker proper. */
10030 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
10032 int seen_linkorder
;
10035 struct bfd_link_order
*p
;
10037 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10039 struct bfd_link_order
**sections
;
10040 asection
*s
, *other_sec
, *linkorder_sec
;
10044 linkorder_sec
= NULL
;
10046 seen_linkorder
= 0;
10047 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10049 if (p
->type
== bfd_indirect_link_order
)
10051 s
= p
->u
.indirect
.section
;
10053 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10054 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
10055 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
10056 && elfsec
< elf_numsections (sub
)
10057 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
10058 && elf_elfsections (sub
)[elfsec
]->sh_link
< elf_numsections (sub
))
10072 if (seen_other
&& seen_linkorder
)
10074 if (other_sec
&& linkorder_sec
)
10075 (*_bfd_error_handler
) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10077 linkorder_sec
->owner
, other_sec
,
10080 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
10082 bfd_set_error (bfd_error_bad_value
);
10087 if (!seen_linkorder
)
10090 sections
= (struct bfd_link_order
**)
10091 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
10092 if (sections
== NULL
)
10094 seen_linkorder
= 0;
10096 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10098 sections
[seen_linkorder
++] = p
;
10100 /* Sort the input sections in the order of their linked section. */
10101 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
10102 compare_link_order
);
10104 /* Change the offsets of the sections. */
10106 for (n
= 0; n
< seen_linkorder
; n
++)
10108 s
= sections
[n
]->u
.indirect
.section
;
10109 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
10110 s
->output_offset
= offset
;
10111 sections
[n
]->offset
= offset
;
10112 /* FIXME: octets_per_byte. */
10113 offset
+= sections
[n
]->size
;
10121 /* Do the final step of an ELF link. */
10124 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
10126 bfd_boolean dynamic
;
10127 bfd_boolean emit_relocs
;
10129 struct elf_final_link_info finfo
;
10131 struct bfd_link_order
*p
;
10133 bfd_size_type max_contents_size
;
10134 bfd_size_type max_external_reloc_size
;
10135 bfd_size_type max_internal_reloc_count
;
10136 bfd_size_type max_sym_count
;
10137 bfd_size_type max_sym_shndx_count
;
10139 Elf_Internal_Sym elfsym
;
10141 Elf_Internal_Shdr
*symtab_hdr
;
10142 Elf_Internal_Shdr
*symtab_shndx_hdr
;
10143 Elf_Internal_Shdr
*symstrtab_hdr
;
10144 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10145 struct elf_outext_info eoinfo
;
10146 bfd_boolean merged
;
10147 size_t relativecount
= 0;
10148 asection
*reldyn
= 0;
10150 asection
*attr_section
= NULL
;
10151 bfd_vma attr_size
= 0;
10152 const char *std_attrs_section
;
10154 if (! is_elf_hash_table (info
->hash
))
10158 abfd
->flags
|= DYNAMIC
;
10160 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
10161 dynobj
= elf_hash_table (info
)->dynobj
;
10163 emit_relocs
= (info
->relocatable
10164 || info
->emitrelocations
);
10167 finfo
.output_bfd
= abfd
;
10168 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
10169 if (finfo
.symstrtab
== NULL
)
10174 finfo
.dynsym_sec
= NULL
;
10175 finfo
.hash_sec
= NULL
;
10176 finfo
.symver_sec
= NULL
;
10180 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
10181 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
10182 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
);
10183 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
10184 /* Note that it is OK if symver_sec is NULL. */
10187 finfo
.contents
= NULL
;
10188 finfo
.external_relocs
= NULL
;
10189 finfo
.internal_relocs
= NULL
;
10190 finfo
.external_syms
= NULL
;
10191 finfo
.locsym_shndx
= NULL
;
10192 finfo
.internal_syms
= NULL
;
10193 finfo
.indices
= NULL
;
10194 finfo
.sections
= NULL
;
10195 finfo
.symbuf
= NULL
;
10196 finfo
.symshndxbuf
= NULL
;
10197 finfo
.symbuf_count
= 0;
10198 finfo
.shndxbuf_size
= 0;
10200 /* The object attributes have been merged. Remove the input
10201 sections from the link, and set the contents of the output
10203 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
10204 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10206 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
10207 || strcmp (o
->name
, ".gnu.attributes") == 0)
10209 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10211 asection
*input_section
;
10213 if (p
->type
!= bfd_indirect_link_order
)
10215 input_section
= p
->u
.indirect
.section
;
10216 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10217 elf_link_input_bfd ignores this section. */
10218 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
10221 attr_size
= bfd_elf_obj_attr_size (abfd
);
10224 bfd_set_section_size (abfd
, o
, attr_size
);
10226 /* Skip this section later on. */
10227 o
->map_head
.link_order
= NULL
;
10230 o
->flags
|= SEC_EXCLUDE
;
10234 /* Count up the number of relocations we will output for each output
10235 section, so that we know the sizes of the reloc sections. We
10236 also figure out some maximum sizes. */
10237 max_contents_size
= 0;
10238 max_external_reloc_size
= 0;
10239 max_internal_reloc_count
= 0;
10241 max_sym_shndx_count
= 0;
10243 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10245 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10246 o
->reloc_count
= 0;
10248 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10250 unsigned int reloc_count
= 0;
10251 struct bfd_elf_section_data
*esdi
= NULL
;
10252 unsigned int *rel_count1
;
10254 if (p
->type
== bfd_section_reloc_link_order
10255 || p
->type
== bfd_symbol_reloc_link_order
)
10257 else if (p
->type
== bfd_indirect_link_order
)
10261 sec
= p
->u
.indirect
.section
;
10262 esdi
= elf_section_data (sec
);
10264 /* Mark all sections which are to be included in the
10265 link. This will normally be every section. We need
10266 to do this so that we can identify any sections which
10267 the linker has decided to not include. */
10268 sec
->linker_mark
= TRUE
;
10270 if (sec
->flags
& SEC_MERGE
)
10273 if (info
->relocatable
|| info
->emitrelocations
)
10274 reloc_count
= sec
->reloc_count
;
10275 else if (bed
->elf_backend_count_relocs
)
10276 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
10278 if (sec
->rawsize
> max_contents_size
)
10279 max_contents_size
= sec
->rawsize
;
10280 if (sec
->size
> max_contents_size
)
10281 max_contents_size
= sec
->size
;
10283 /* We are interested in just local symbols, not all
10285 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
10286 && (sec
->owner
->flags
& DYNAMIC
) == 0)
10290 if (elf_bad_symtab (sec
->owner
))
10291 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
10292 / bed
->s
->sizeof_sym
);
10294 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
10296 if (sym_count
> max_sym_count
)
10297 max_sym_count
= sym_count
;
10299 if (sym_count
> max_sym_shndx_count
10300 && elf_symtab_shndx (sec
->owner
) != 0)
10301 max_sym_shndx_count
= sym_count
;
10303 if ((sec
->flags
& SEC_RELOC
) != 0)
10307 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
10308 if (ext_size
> max_external_reloc_size
)
10309 max_external_reloc_size
= ext_size
;
10310 if (sec
->reloc_count
> max_internal_reloc_count
)
10311 max_internal_reloc_count
= sec
->reloc_count
;
10316 if (reloc_count
== 0)
10319 o
->reloc_count
+= reloc_count
;
10321 /* MIPS may have a mix of REL and RELA relocs on sections.
10322 To support this curious ABI we keep reloc counts in
10323 elf_section_data too. We must be careful to add the
10324 relocations from the input section to the right output
10325 count. FIXME: Get rid of one count. We have
10326 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
10327 rel_count1
= &esdo
->rel_count
;
10330 bfd_boolean same_size
;
10331 bfd_size_type entsize1
;
10333 entsize1
= esdi
->rel_hdr
.sh_entsize
;
10334 /* PR 9827: If the header size has not been set yet then
10335 assume that it will match the output section's reloc type. */
10337 entsize1
= o
->use_rela_p
? bed
->s
->sizeof_rela
: bed
->s
->sizeof_rel
;
10339 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
10340 || entsize1
== bed
->s
->sizeof_rela
);
10341 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
10344 rel_count1
= &esdo
->rel_count2
;
10346 if (esdi
->rel_hdr2
!= NULL
)
10348 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
10349 unsigned int alt_count
;
10350 unsigned int *rel_count2
;
10352 BFD_ASSERT (entsize2
!= entsize1
10353 && (entsize2
== bed
->s
->sizeof_rel
10354 || entsize2
== bed
->s
->sizeof_rela
));
10356 rel_count2
= &esdo
->rel_count2
;
10358 rel_count2
= &esdo
->rel_count
;
10360 /* The following is probably too simplistic if the
10361 backend counts output relocs unusually. */
10362 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
10363 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
10364 *rel_count2
+= alt_count
;
10365 reloc_count
-= alt_count
;
10368 *rel_count1
+= reloc_count
;
10371 if (o
->reloc_count
> 0)
10372 o
->flags
|= SEC_RELOC
;
10375 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10376 set it (this is probably a bug) and if it is set
10377 assign_section_numbers will create a reloc section. */
10378 o
->flags
&=~ SEC_RELOC
;
10381 /* If the SEC_ALLOC flag is not set, force the section VMA to
10382 zero. This is done in elf_fake_sections as well, but forcing
10383 the VMA to 0 here will ensure that relocs against these
10384 sections are handled correctly. */
10385 if ((o
->flags
& SEC_ALLOC
) == 0
10386 && ! o
->user_set_vma
)
10390 if (! info
->relocatable
&& merged
)
10391 elf_link_hash_traverse (elf_hash_table (info
),
10392 _bfd_elf_link_sec_merge_syms
, abfd
);
10394 /* Figure out the file positions for everything but the symbol table
10395 and the relocs. We set symcount to force assign_section_numbers
10396 to create a symbol table. */
10397 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
10398 BFD_ASSERT (! abfd
->output_has_begun
);
10399 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
10402 /* Set sizes, and assign file positions for reloc sections. */
10403 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10405 if ((o
->flags
& SEC_RELOC
) != 0)
10407 if (!(_bfd_elf_link_size_reloc_section
10408 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
10411 if (elf_section_data (o
)->rel_hdr2
10412 && !(_bfd_elf_link_size_reloc_section
10413 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
10417 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10418 to count upwards while actually outputting the relocations. */
10419 elf_section_data (o
)->rel_count
= 0;
10420 elf_section_data (o
)->rel_count2
= 0;
10423 _bfd_elf_assign_file_positions_for_relocs (abfd
);
10425 /* We have now assigned file positions for all the sections except
10426 .symtab and .strtab. We start the .symtab section at the current
10427 file position, and write directly to it. We build the .strtab
10428 section in memory. */
10429 bfd_get_symcount (abfd
) = 0;
10430 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10431 /* sh_name is set in prep_headers. */
10432 symtab_hdr
->sh_type
= SHT_SYMTAB
;
10433 /* sh_flags, sh_addr and sh_size all start off zero. */
10434 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
10435 /* sh_link is set in assign_section_numbers. */
10436 /* sh_info is set below. */
10437 /* sh_offset is set just below. */
10438 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
10440 off
= elf_tdata (abfd
)->next_file_pos
;
10441 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
10443 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10444 incorrect. We do not yet know the size of the .symtab section.
10445 We correct next_file_pos below, after we do know the size. */
10447 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10448 continuously seeking to the right position in the file. */
10449 if (! info
->keep_memory
|| max_sym_count
< 20)
10450 finfo
.symbuf_size
= 20;
10452 finfo
.symbuf_size
= max_sym_count
;
10453 amt
= finfo
.symbuf_size
;
10454 amt
*= bed
->s
->sizeof_sym
;
10455 finfo
.symbuf
= (bfd_byte
*) bfd_malloc (amt
);
10456 if (finfo
.symbuf
== NULL
)
10458 if (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF))
10460 /* Wild guess at number of output symbols. realloc'd as needed. */
10461 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
10462 finfo
.shndxbuf_size
= amt
;
10463 amt
*= sizeof (Elf_External_Sym_Shndx
);
10464 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
10465 if (finfo
.symshndxbuf
== NULL
)
10469 /* Start writing out the symbol table. The first symbol is always a
10471 if (info
->strip
!= strip_all
10474 elfsym
.st_value
= 0;
10475 elfsym
.st_size
= 0;
10476 elfsym
.st_info
= 0;
10477 elfsym
.st_other
= 0;
10478 elfsym
.st_shndx
= SHN_UNDEF
;
10479 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
10484 /* Output a symbol for each section. We output these even if we are
10485 discarding local symbols, since they are used for relocs. These
10486 symbols have no names. We store the index of each one in the
10487 index field of the section, so that we can find it again when
10488 outputting relocs. */
10489 if (info
->strip
!= strip_all
10492 elfsym
.st_size
= 0;
10493 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10494 elfsym
.st_other
= 0;
10495 elfsym
.st_value
= 0;
10496 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10498 o
= bfd_section_from_elf_index (abfd
, i
);
10501 o
->target_index
= bfd_get_symcount (abfd
);
10502 elfsym
.st_shndx
= i
;
10503 if (!info
->relocatable
)
10504 elfsym
.st_value
= o
->vma
;
10505 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
) != 1)
10511 /* Allocate some memory to hold information read in from the input
10513 if (max_contents_size
!= 0)
10515 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
10516 if (finfo
.contents
== NULL
)
10520 if (max_external_reloc_size
!= 0)
10522 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
10523 if (finfo
.external_relocs
== NULL
)
10527 if (max_internal_reloc_count
!= 0)
10529 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10530 amt
*= sizeof (Elf_Internal_Rela
);
10531 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
10532 if (finfo
.internal_relocs
== NULL
)
10536 if (max_sym_count
!= 0)
10538 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
10539 finfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
10540 if (finfo
.external_syms
== NULL
)
10543 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
10544 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
10545 if (finfo
.internal_syms
== NULL
)
10548 amt
= max_sym_count
* sizeof (long);
10549 finfo
.indices
= (long int *) bfd_malloc (amt
);
10550 if (finfo
.indices
== NULL
)
10553 amt
= max_sym_count
* sizeof (asection
*);
10554 finfo
.sections
= (asection
**) bfd_malloc (amt
);
10555 if (finfo
.sections
== NULL
)
10559 if (max_sym_shndx_count
!= 0)
10561 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
10562 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
10563 if (finfo
.locsym_shndx
== NULL
)
10567 if (elf_hash_table (info
)->tls_sec
)
10569 bfd_vma base
, end
= 0;
10572 for (sec
= elf_hash_table (info
)->tls_sec
;
10573 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
10576 bfd_size_type size
= sec
->size
;
10579 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
10581 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
10584 size
= ord
->offset
+ ord
->size
;
10586 end
= sec
->vma
+ size
;
10588 base
= elf_hash_table (info
)->tls_sec
->vma
;
10589 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
10590 elf_hash_table (info
)->tls_size
= end
- base
;
10593 /* Reorder SHF_LINK_ORDER sections. */
10594 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10596 if (!elf_fixup_link_order (abfd
, o
))
10600 /* Since ELF permits relocations to be against local symbols, we
10601 must have the local symbols available when we do the relocations.
10602 Since we would rather only read the local symbols once, and we
10603 would rather not keep them in memory, we handle all the
10604 relocations for a single input file at the same time.
10606 Unfortunately, there is no way to know the total number of local
10607 symbols until we have seen all of them, and the local symbol
10608 indices precede the global symbol indices. This means that when
10609 we are generating relocatable output, and we see a reloc against
10610 a global symbol, we can not know the symbol index until we have
10611 finished examining all the local symbols to see which ones we are
10612 going to output. To deal with this, we keep the relocations in
10613 memory, and don't output them until the end of the link. This is
10614 an unfortunate waste of memory, but I don't see a good way around
10615 it. Fortunately, it only happens when performing a relocatable
10616 link, which is not the common case. FIXME: If keep_memory is set
10617 we could write the relocs out and then read them again; I don't
10618 know how bad the memory loss will be. */
10620 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10621 sub
->output_has_begun
= FALSE
;
10622 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10624 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10626 if (p
->type
== bfd_indirect_link_order
10627 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
10628 == bfd_target_elf_flavour
)
10629 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
10631 if (! sub
->output_has_begun
)
10633 if (! elf_link_input_bfd (&finfo
, sub
))
10635 sub
->output_has_begun
= TRUE
;
10638 else if (p
->type
== bfd_section_reloc_link_order
10639 || p
->type
== bfd_symbol_reloc_link_order
)
10641 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
10646 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
10652 /* Free symbol buffer if needed. */
10653 if (!info
->reduce_memory_overheads
)
10655 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10656 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10657 && elf_tdata (sub
)->symbuf
)
10659 free (elf_tdata (sub
)->symbuf
);
10660 elf_tdata (sub
)->symbuf
= NULL
;
10664 /* Output any global symbols that got converted to local in a
10665 version script or due to symbol visibility. We do this in a
10666 separate step since ELF requires all local symbols to appear
10667 prior to any global symbols. FIXME: We should only do this if
10668 some global symbols were, in fact, converted to become local.
10669 FIXME: Will this work correctly with the Irix 5 linker? */
10670 eoinfo
.failed
= FALSE
;
10671 eoinfo
.finfo
= &finfo
;
10672 eoinfo
.localsyms
= TRUE
;
10673 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10678 /* If backend needs to output some local symbols not present in the hash
10679 table, do it now. */
10680 if (bed
->elf_backend_output_arch_local_syms
)
10682 typedef int (*out_sym_func
)
10683 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10684 struct elf_link_hash_entry
*);
10686 if (! ((*bed
->elf_backend_output_arch_local_syms
)
10687 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10691 /* That wrote out all the local symbols. Finish up the symbol table
10692 with the global symbols. Even if we want to strip everything we
10693 can, we still need to deal with those global symbols that got
10694 converted to local in a version script. */
10696 /* The sh_info field records the index of the first non local symbol. */
10697 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
10700 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
10702 Elf_Internal_Sym sym
;
10703 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
10704 long last_local
= 0;
10706 /* Write out the section symbols for the output sections. */
10707 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
10713 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10716 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
10722 dynindx
= elf_section_data (s
)->dynindx
;
10725 indx
= elf_section_data (s
)->this_idx
;
10726 BFD_ASSERT (indx
> 0);
10727 sym
.st_shndx
= indx
;
10728 if (! check_dynsym (abfd
, &sym
))
10730 sym
.st_value
= s
->vma
;
10731 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
10732 if (last_local
< dynindx
)
10733 last_local
= dynindx
;
10734 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10738 /* Write out the local dynsyms. */
10739 if (elf_hash_table (info
)->dynlocal
)
10741 struct elf_link_local_dynamic_entry
*e
;
10742 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
10747 /* Copy the internal symbol and turn off visibility.
10748 Note that we saved a word of storage and overwrote
10749 the original st_name with the dynstr_index. */
10751 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10753 s
= bfd_section_from_elf_index (e
->input_bfd
,
10758 elf_section_data (s
->output_section
)->this_idx
;
10759 if (! check_dynsym (abfd
, &sym
))
10761 sym
.st_value
= (s
->output_section
->vma
10763 + e
->isym
.st_value
);
10766 if (last_local
< e
->dynindx
)
10767 last_local
= e
->dynindx
;
10769 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
10770 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10774 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
10778 /* We get the global symbols from the hash table. */
10779 eoinfo
.failed
= FALSE
;
10780 eoinfo
.localsyms
= FALSE
;
10781 eoinfo
.finfo
= &finfo
;
10782 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10787 /* If backend needs to output some symbols not present in the hash
10788 table, do it now. */
10789 if (bed
->elf_backend_output_arch_syms
)
10791 typedef int (*out_sym_func
)
10792 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10793 struct elf_link_hash_entry
*);
10795 if (! ((*bed
->elf_backend_output_arch_syms
)
10796 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10800 /* Flush all symbols to the file. */
10801 if (! elf_link_flush_output_syms (&finfo
, bed
))
10804 /* Now we know the size of the symtab section. */
10805 off
+= symtab_hdr
->sh_size
;
10807 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
10808 if (symtab_shndx_hdr
->sh_name
!= 0)
10810 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
10811 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
10812 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
10813 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
10814 symtab_shndx_hdr
->sh_size
= amt
;
10816 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
10819 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
10820 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
10825 /* Finish up and write out the symbol string table (.strtab)
10827 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
10828 /* sh_name was set in prep_headers. */
10829 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
10830 symstrtab_hdr
->sh_flags
= 0;
10831 symstrtab_hdr
->sh_addr
= 0;
10832 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
10833 symstrtab_hdr
->sh_entsize
= 0;
10834 symstrtab_hdr
->sh_link
= 0;
10835 symstrtab_hdr
->sh_info
= 0;
10836 /* sh_offset is set just below. */
10837 symstrtab_hdr
->sh_addralign
= 1;
10839 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
10840 elf_tdata (abfd
)->next_file_pos
= off
;
10842 if (bfd_get_symcount (abfd
) > 0)
10844 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
10845 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
10849 /* Adjust the relocs to have the correct symbol indices. */
10850 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10852 if ((o
->flags
& SEC_RELOC
) == 0)
10855 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
10856 elf_section_data (o
)->rel_count
,
10857 elf_section_data (o
)->rel_hashes
);
10858 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
10859 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
10860 elf_section_data (o
)->rel_count2
,
10861 (elf_section_data (o
)->rel_hashes
10862 + elf_section_data (o
)->rel_count
));
10864 /* Set the reloc_count field to 0 to prevent write_relocs from
10865 trying to swap the relocs out itself. */
10866 o
->reloc_count
= 0;
10869 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
10870 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
10872 /* If we are linking against a dynamic object, or generating a
10873 shared library, finish up the dynamic linking information. */
10876 bfd_byte
*dyncon
, *dynconend
;
10878 /* Fix up .dynamic entries. */
10879 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10880 BFD_ASSERT (o
!= NULL
);
10882 dyncon
= o
->contents
;
10883 dynconend
= o
->contents
+ o
->size
;
10884 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10886 Elf_Internal_Dyn dyn
;
10890 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10897 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
10899 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
10901 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
10902 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
10905 dyn
.d_un
.d_val
= relativecount
;
10912 name
= info
->init_function
;
10915 name
= info
->fini_function
;
10918 struct elf_link_hash_entry
*h
;
10920 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
10921 FALSE
, FALSE
, TRUE
);
10923 && (h
->root
.type
== bfd_link_hash_defined
10924 || h
->root
.type
== bfd_link_hash_defweak
))
10926 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
10927 o
= h
->root
.u
.def
.section
;
10928 if (o
->output_section
!= NULL
)
10929 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
10930 + o
->output_offset
);
10933 /* The symbol is imported from another shared
10934 library and does not apply to this one. */
10935 dyn
.d_un
.d_ptr
= 0;
10942 case DT_PREINIT_ARRAYSZ
:
10943 name
= ".preinit_array";
10945 case DT_INIT_ARRAYSZ
:
10946 name
= ".init_array";
10948 case DT_FINI_ARRAYSZ
:
10949 name
= ".fini_array";
10951 o
= bfd_get_section_by_name (abfd
, name
);
10954 (*_bfd_error_handler
)
10955 (_("%B: could not find output section %s"), abfd
, name
);
10959 (*_bfd_error_handler
)
10960 (_("warning: %s section has zero size"), name
);
10961 dyn
.d_un
.d_val
= o
->size
;
10964 case DT_PREINIT_ARRAY
:
10965 name
= ".preinit_array";
10967 case DT_INIT_ARRAY
:
10968 name
= ".init_array";
10970 case DT_FINI_ARRAY
:
10971 name
= ".fini_array";
10978 name
= ".gnu.hash";
10987 name
= ".gnu.version_d";
10990 name
= ".gnu.version_r";
10993 name
= ".gnu.version";
10995 o
= bfd_get_section_by_name (abfd
, name
);
10998 (*_bfd_error_handler
)
10999 (_("%B: could not find output section %s"), abfd
, name
);
11002 dyn
.d_un
.d_ptr
= o
->vma
;
11009 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
11013 dyn
.d_un
.d_val
= 0;
11014 dyn
.d_un
.d_ptr
= 0;
11015 for (i
= 1; i
< elf_numsections (abfd
); i
++)
11017 Elf_Internal_Shdr
*hdr
;
11019 hdr
= elf_elfsections (abfd
)[i
];
11020 if (hdr
->sh_type
== type
11021 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
11023 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
11024 dyn
.d_un
.d_val
+= hdr
->sh_size
;
11027 if (dyn
.d_un
.d_ptr
== 0
11028 || hdr
->sh_addr
< dyn
.d_un
.d_ptr
)
11029 dyn
.d_un
.d_ptr
= hdr
->sh_addr
;
11035 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
11039 /* If we have created any dynamic sections, then output them. */
11040 if (dynobj
!= NULL
)
11042 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
11045 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11046 if (info
->warn_shared_textrel
&& info
->shared
)
11048 bfd_byte
*dyncon
, *dynconend
;
11050 /* Fix up .dynamic entries. */
11051 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
11052 BFD_ASSERT (o
!= NULL
);
11054 dyncon
= o
->contents
;
11055 dynconend
= o
->contents
+ o
->size
;
11056 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
11058 Elf_Internal_Dyn dyn
;
11060 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
11062 if (dyn
.d_tag
== DT_TEXTREL
)
11064 info
->callbacks
->einfo
11065 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11071 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
11073 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11075 || o
->output_section
== bfd_abs_section_ptr
)
11077 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
11079 /* At this point, we are only interested in sections
11080 created by _bfd_elf_link_create_dynamic_sections. */
11083 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
11085 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
11087 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
11089 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
11091 /* FIXME: octets_per_byte. */
11092 if (! bfd_set_section_contents (abfd
, o
->output_section
,
11094 (file_ptr
) o
->output_offset
,
11100 /* The contents of the .dynstr section are actually in a
11102 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
11103 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
11104 || ! _bfd_elf_strtab_emit (abfd
,
11105 elf_hash_table (info
)->dynstr
))
11111 if (info
->relocatable
)
11113 bfd_boolean failed
= FALSE
;
11115 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
11120 /* If we have optimized stabs strings, output them. */
11121 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
11123 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
11127 if (info
->eh_frame_hdr
)
11129 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
11133 if (finfo
.symstrtab
!= NULL
)
11134 _bfd_stringtab_free (finfo
.symstrtab
);
11135 if (finfo
.contents
!= NULL
)
11136 free (finfo
.contents
);
11137 if (finfo
.external_relocs
!= NULL
)
11138 free (finfo
.external_relocs
);
11139 if (finfo
.internal_relocs
!= NULL
)
11140 free (finfo
.internal_relocs
);
11141 if (finfo
.external_syms
!= NULL
)
11142 free (finfo
.external_syms
);
11143 if (finfo
.locsym_shndx
!= NULL
)
11144 free (finfo
.locsym_shndx
);
11145 if (finfo
.internal_syms
!= NULL
)
11146 free (finfo
.internal_syms
);
11147 if (finfo
.indices
!= NULL
)
11148 free (finfo
.indices
);
11149 if (finfo
.sections
!= NULL
)
11150 free (finfo
.sections
);
11151 if (finfo
.symbuf
!= NULL
)
11152 free (finfo
.symbuf
);
11153 if (finfo
.symshndxbuf
!= NULL
)
11154 free (finfo
.symshndxbuf
);
11155 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11157 if ((o
->flags
& SEC_RELOC
) != 0
11158 && elf_section_data (o
)->rel_hashes
!= NULL
)
11159 free (elf_section_data (o
)->rel_hashes
);
11162 elf_tdata (abfd
)->linker
= TRUE
;
11166 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
11167 if (contents
== NULL
)
11168 return FALSE
; /* Bail out and fail. */
11169 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
11170 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
11177 if (finfo
.symstrtab
!= NULL
)
11178 _bfd_stringtab_free (finfo
.symstrtab
);
11179 if (finfo
.contents
!= NULL
)
11180 free (finfo
.contents
);
11181 if (finfo
.external_relocs
!= NULL
)
11182 free (finfo
.external_relocs
);
11183 if (finfo
.internal_relocs
!= NULL
)
11184 free (finfo
.internal_relocs
);
11185 if (finfo
.external_syms
!= NULL
)
11186 free (finfo
.external_syms
);
11187 if (finfo
.locsym_shndx
!= NULL
)
11188 free (finfo
.locsym_shndx
);
11189 if (finfo
.internal_syms
!= NULL
)
11190 free (finfo
.internal_syms
);
11191 if (finfo
.indices
!= NULL
)
11192 free (finfo
.indices
);
11193 if (finfo
.sections
!= NULL
)
11194 free (finfo
.sections
);
11195 if (finfo
.symbuf
!= NULL
)
11196 free (finfo
.symbuf
);
11197 if (finfo
.symshndxbuf
!= NULL
)
11198 free (finfo
.symshndxbuf
);
11199 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11201 if ((o
->flags
& SEC_RELOC
) != 0
11202 && elf_section_data (o
)->rel_hashes
!= NULL
)
11203 free (elf_section_data (o
)->rel_hashes
);
11209 /* Initialize COOKIE for input bfd ABFD. */
11212 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
11213 struct bfd_link_info
*info
, bfd
*abfd
)
11215 Elf_Internal_Shdr
*symtab_hdr
;
11216 const struct elf_backend_data
*bed
;
11218 bed
= get_elf_backend_data (abfd
);
11219 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11221 cookie
->abfd
= abfd
;
11222 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
11223 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
11224 if (cookie
->bad_symtab
)
11226 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11227 cookie
->extsymoff
= 0;
11231 cookie
->locsymcount
= symtab_hdr
->sh_info
;
11232 cookie
->extsymoff
= symtab_hdr
->sh_info
;
11235 if (bed
->s
->arch_size
== 32)
11236 cookie
->r_sym_shift
= 8;
11238 cookie
->r_sym_shift
= 32;
11240 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11241 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
11243 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
11244 cookie
->locsymcount
, 0,
11246 if (cookie
->locsyms
== NULL
)
11248 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
11251 if (info
->keep_memory
)
11252 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
11257 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11260 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
11262 Elf_Internal_Shdr
*symtab_hdr
;
11264 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11265 if (cookie
->locsyms
!= NULL
11266 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
11267 free (cookie
->locsyms
);
11270 /* Initialize the relocation information in COOKIE for input section SEC
11271 of input bfd ABFD. */
11274 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11275 struct bfd_link_info
*info
, bfd
*abfd
,
11278 const struct elf_backend_data
*bed
;
11280 if (sec
->reloc_count
== 0)
11282 cookie
->rels
= NULL
;
11283 cookie
->relend
= NULL
;
11287 bed
= get_elf_backend_data (abfd
);
11289 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
11290 info
->keep_memory
);
11291 if (cookie
->rels
== NULL
)
11293 cookie
->rel
= cookie
->rels
;
11294 cookie
->relend
= (cookie
->rels
11295 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
11297 cookie
->rel
= cookie
->rels
;
11301 /* Free the memory allocated by init_reloc_cookie_rels,
11305 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11308 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
11309 free (cookie
->rels
);
11312 /* Initialize the whole of COOKIE for input section SEC. */
11315 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11316 struct bfd_link_info
*info
,
11319 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
11321 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
11326 fini_reloc_cookie (cookie
, sec
->owner
);
11331 /* Free the memory allocated by init_reloc_cookie_for_section,
11335 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11338 fini_reloc_cookie_rels (cookie
, sec
);
11339 fini_reloc_cookie (cookie
, sec
->owner
);
11342 /* Garbage collect unused sections. */
11344 /* Default gc_mark_hook. */
11347 _bfd_elf_gc_mark_hook (asection
*sec
,
11348 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
11349 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
11350 struct elf_link_hash_entry
*h
,
11351 Elf_Internal_Sym
*sym
)
11353 const char *sec_name
;
11357 switch (h
->root
.type
)
11359 case bfd_link_hash_defined
:
11360 case bfd_link_hash_defweak
:
11361 return h
->root
.u
.def
.section
;
11363 case bfd_link_hash_common
:
11364 return h
->root
.u
.c
.p
->section
;
11366 case bfd_link_hash_undefined
:
11367 case bfd_link_hash_undefweak
:
11368 /* To work around a glibc bug, keep all XXX input sections
11369 when there is an as yet undefined reference to __start_XXX
11370 or __stop_XXX symbols. The linker will later define such
11371 symbols for orphan input sections that have a name
11372 representable as a C identifier. */
11373 if (strncmp (h
->root
.root
.string
, "__start_", 8) == 0)
11374 sec_name
= h
->root
.root
.string
+ 8;
11375 else if (strncmp (h
->root
.root
.string
, "__stop_", 7) == 0)
11376 sec_name
= h
->root
.root
.string
+ 7;
11380 if (sec_name
&& *sec_name
!= '\0')
11384 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
11386 sec
= bfd_get_section_by_name (i
, sec_name
);
11388 sec
->flags
|= SEC_KEEP
;
11398 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
11403 /* COOKIE->rel describes a relocation against section SEC, which is
11404 a section we've decided to keep. Return the section that contains
11405 the relocation symbol, or NULL if no section contains it. */
11408 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
11409 elf_gc_mark_hook_fn gc_mark_hook
,
11410 struct elf_reloc_cookie
*cookie
)
11412 unsigned long r_symndx
;
11413 struct elf_link_hash_entry
*h
;
11415 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
11419 if (r_symndx
>= cookie
->locsymcount
11420 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11422 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
11423 while (h
->root
.type
== bfd_link_hash_indirect
11424 || h
->root
.type
== bfd_link_hash_warning
)
11425 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11426 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
11429 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
11430 &cookie
->locsyms
[r_symndx
]);
11433 /* COOKIE->rel describes a relocation against section SEC, which is
11434 a section we've decided to keep. Mark the section that contains
11435 the relocation symbol. */
11438 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
11440 elf_gc_mark_hook_fn gc_mark_hook
,
11441 struct elf_reloc_cookie
*cookie
)
11445 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
);
11446 if (rsec
&& !rsec
->gc_mark
)
11448 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
11450 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
11456 /* The mark phase of garbage collection. For a given section, mark
11457 it and any sections in this section's group, and all the sections
11458 which define symbols to which it refers. */
11461 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
11463 elf_gc_mark_hook_fn gc_mark_hook
)
11466 asection
*group_sec
, *eh_frame
;
11470 /* Mark all the sections in the group. */
11471 group_sec
= elf_section_data (sec
)->next_in_group
;
11472 if (group_sec
&& !group_sec
->gc_mark
)
11473 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
11476 /* Look through the section relocs. */
11478 eh_frame
= elf_eh_frame_section (sec
->owner
);
11479 if ((sec
->flags
& SEC_RELOC
) != 0
11480 && sec
->reloc_count
> 0
11481 && sec
!= eh_frame
)
11483 struct elf_reloc_cookie cookie
;
11485 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
11489 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
11490 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
11495 fini_reloc_cookie_for_section (&cookie
, sec
);
11499 if (ret
&& eh_frame
&& elf_fde_list (sec
))
11501 struct elf_reloc_cookie cookie
;
11503 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
11507 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
11508 gc_mark_hook
, &cookie
))
11510 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
11517 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11519 struct elf_gc_sweep_symbol_info
11521 struct bfd_link_info
*info
;
11522 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
11527 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
11529 if (h
->root
.type
== bfd_link_hash_warning
)
11530 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11532 if ((h
->root
.type
== bfd_link_hash_defined
11533 || h
->root
.type
== bfd_link_hash_defweak
)
11534 && !h
->root
.u
.def
.section
->gc_mark
11535 && !(h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
))
11537 struct elf_gc_sweep_symbol_info
*inf
=
11538 (struct elf_gc_sweep_symbol_info
*) data
;
11539 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
11545 /* The sweep phase of garbage collection. Remove all garbage sections. */
11547 typedef bfd_boolean (*gc_sweep_hook_fn
)
11548 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
11551 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
11554 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11555 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
11556 unsigned long section_sym_count
;
11557 struct elf_gc_sweep_symbol_info sweep_info
;
11559 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11563 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11566 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11568 /* When any section in a section group is kept, we keep all
11569 sections in the section group. If the first member of
11570 the section group is excluded, we will also exclude the
11572 if (o
->flags
& SEC_GROUP
)
11574 asection
*first
= elf_next_in_group (o
);
11575 o
->gc_mark
= first
->gc_mark
;
11577 else if ((o
->flags
& (SEC_DEBUGGING
| SEC_LINKER_CREATED
)) != 0
11578 || (o
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0
11579 || elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
)
11581 /* Keep debug, special and SHT_NOTE sections. */
11588 /* Skip sweeping sections already excluded. */
11589 if (o
->flags
& SEC_EXCLUDE
)
11592 /* Since this is early in the link process, it is simple
11593 to remove a section from the output. */
11594 o
->flags
|= SEC_EXCLUDE
;
11596 if (info
->print_gc_sections
&& o
->size
!= 0)
11597 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
11599 /* But we also have to update some of the relocation
11600 info we collected before. */
11602 && (o
->flags
& SEC_RELOC
) != 0
11603 && o
->reloc_count
> 0
11604 && !bfd_is_abs_section (o
->output_section
))
11606 Elf_Internal_Rela
*internal_relocs
;
11610 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
11611 info
->keep_memory
);
11612 if (internal_relocs
== NULL
)
11615 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
11617 if (elf_section_data (o
)->relocs
!= internal_relocs
)
11618 free (internal_relocs
);
11626 /* Remove the symbols that were in the swept sections from the dynamic
11627 symbol table. GCFIXME: Anyone know how to get them out of the
11628 static symbol table as well? */
11629 sweep_info
.info
= info
;
11630 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
11631 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
11634 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
11638 /* Propagate collected vtable information. This is called through
11639 elf_link_hash_traverse. */
11642 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
11644 if (h
->root
.type
== bfd_link_hash_warning
)
11645 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11647 /* Those that are not vtables. */
11648 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11651 /* Those vtables that do not have parents, we cannot merge. */
11652 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
11655 /* If we've already been done, exit. */
11656 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
11659 /* Make sure the parent's table is up to date. */
11660 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
11662 if (h
->vtable
->used
== NULL
)
11664 /* None of this table's entries were referenced. Re-use the
11666 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
11667 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
11672 bfd_boolean
*cu
, *pu
;
11674 /* Or the parent's entries into ours. */
11675 cu
= h
->vtable
->used
;
11677 pu
= h
->vtable
->parent
->vtable
->used
;
11680 const struct elf_backend_data
*bed
;
11681 unsigned int log_file_align
;
11683 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
11684 log_file_align
= bed
->s
->log_file_align
;
11685 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
11700 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
11703 bfd_vma hstart
, hend
;
11704 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
11705 const struct elf_backend_data
*bed
;
11706 unsigned int log_file_align
;
11708 if (h
->root
.type
== bfd_link_hash_warning
)
11709 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11711 /* Take care of both those symbols that do not describe vtables as
11712 well as those that are not loaded. */
11713 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11716 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
11717 || h
->root
.type
== bfd_link_hash_defweak
);
11719 sec
= h
->root
.u
.def
.section
;
11720 hstart
= h
->root
.u
.def
.value
;
11721 hend
= hstart
+ h
->size
;
11723 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
11725 return *(bfd_boolean
*) okp
= FALSE
;
11726 bed
= get_elf_backend_data (sec
->owner
);
11727 log_file_align
= bed
->s
->log_file_align
;
11729 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
11731 for (rel
= relstart
; rel
< relend
; ++rel
)
11732 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
11734 /* If the entry is in use, do nothing. */
11735 if (h
->vtable
->used
11736 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
11738 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
11739 if (h
->vtable
->used
[entry
])
11742 /* Otherwise, kill it. */
11743 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
11749 /* Mark sections containing dynamically referenced symbols. When
11750 building shared libraries, we must assume that any visible symbol is
11754 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
11756 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
11758 if (h
->root
.type
== bfd_link_hash_warning
)
11759 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11761 if ((h
->root
.type
== bfd_link_hash_defined
11762 || h
->root
.type
== bfd_link_hash_defweak
)
11764 || (!info
->executable
11766 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
11767 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
)))
11768 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11773 /* Keep all sections containing symbols undefined on the command-line,
11774 and the section containing the entry symbol. */
11777 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
11779 struct bfd_sym_chain
*sym
;
11781 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
11783 struct elf_link_hash_entry
*h
;
11785 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
11786 FALSE
, FALSE
, FALSE
);
11789 && (h
->root
.type
== bfd_link_hash_defined
11790 || h
->root
.type
== bfd_link_hash_defweak
)
11791 && !bfd_is_abs_section (h
->root
.u
.def
.section
))
11792 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11796 /* Do mark and sweep of unused sections. */
11799 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
11801 bfd_boolean ok
= TRUE
;
11803 elf_gc_mark_hook_fn gc_mark_hook
;
11804 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11806 if (!bed
->can_gc_sections
11807 || !is_elf_hash_table (info
->hash
))
11809 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
11813 bed
->gc_keep (info
);
11815 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11816 at the .eh_frame section if we can mark the FDEs individually. */
11817 _bfd_elf_begin_eh_frame_parsing (info
);
11818 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11821 struct elf_reloc_cookie cookie
;
11823 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
11824 if (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
11826 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
11827 if (elf_section_data (sec
)->sec_info
)
11828 elf_eh_frame_section (sub
) = sec
;
11829 fini_reloc_cookie_for_section (&cookie
, sec
);
11832 _bfd_elf_end_eh_frame_parsing (info
);
11834 /* Apply transitive closure to the vtable entry usage info. */
11835 elf_link_hash_traverse (elf_hash_table (info
),
11836 elf_gc_propagate_vtable_entries_used
,
11841 /* Kill the vtable relocations that were not used. */
11842 elf_link_hash_traverse (elf_hash_table (info
),
11843 elf_gc_smash_unused_vtentry_relocs
,
11848 /* Mark dynamically referenced symbols. */
11849 if (elf_hash_table (info
)->dynamic_sections_created
)
11850 elf_link_hash_traverse (elf_hash_table (info
),
11851 bed
->gc_mark_dynamic_ref
,
11854 /* Grovel through relocs to find out who stays ... */
11855 gc_mark_hook
= bed
->gc_mark_hook
;
11856 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11860 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11863 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11864 if ((o
->flags
& (SEC_EXCLUDE
| SEC_KEEP
)) == SEC_KEEP
&& !o
->gc_mark
)
11865 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
11869 /* Allow the backend to mark additional target specific sections. */
11870 if (bed
->gc_mark_extra_sections
)
11871 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
11873 /* ... and mark SEC_EXCLUDE for those that go. */
11874 return elf_gc_sweep (abfd
, info
);
11877 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11880 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
11882 struct elf_link_hash_entry
*h
,
11885 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
11886 struct elf_link_hash_entry
**search
, *child
;
11887 bfd_size_type extsymcount
;
11888 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11890 /* The sh_info field of the symtab header tells us where the
11891 external symbols start. We don't care about the local symbols at
11893 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
11894 if (!elf_bad_symtab (abfd
))
11895 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
11897 sym_hashes
= elf_sym_hashes (abfd
);
11898 sym_hashes_end
= sym_hashes
+ extsymcount
;
11900 /* Hunt down the child symbol, which is in this section at the same
11901 offset as the relocation. */
11902 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
11904 if ((child
= *search
) != NULL
11905 && (child
->root
.type
== bfd_link_hash_defined
11906 || child
->root
.type
== bfd_link_hash_defweak
)
11907 && child
->root
.u
.def
.section
== sec
11908 && child
->root
.u
.def
.value
== offset
)
11912 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
11913 abfd
, sec
, (unsigned long) offset
);
11914 bfd_set_error (bfd_error_invalid_operation
);
11918 if (!child
->vtable
)
11920 child
->vtable
= (struct elf_link_virtual_table_entry
*)
11921 bfd_zalloc (abfd
, sizeof (*child
->vtable
));
11922 if (!child
->vtable
)
11927 /* This *should* only be the absolute section. It could potentially
11928 be that someone has defined a non-global vtable though, which
11929 would be bad. It isn't worth paging in the local symbols to be
11930 sure though; that case should simply be handled by the assembler. */
11932 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
11935 child
->vtable
->parent
= h
;
11940 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
11943 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
11944 asection
*sec ATTRIBUTE_UNUSED
,
11945 struct elf_link_hash_entry
*h
,
11948 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11949 unsigned int log_file_align
= bed
->s
->log_file_align
;
11953 h
->vtable
= (struct elf_link_virtual_table_entry
*)
11954 bfd_zalloc (abfd
, sizeof (*h
->vtable
));
11959 if (addend
>= h
->vtable
->size
)
11961 size_t size
, bytes
, file_align
;
11962 bfd_boolean
*ptr
= h
->vtable
->used
;
11964 /* While the symbol is undefined, we have to be prepared to handle
11966 file_align
= 1 << log_file_align
;
11967 if (h
->root
.type
== bfd_link_hash_undefined
)
11968 size
= addend
+ file_align
;
11972 if (addend
>= size
)
11974 /* Oops! We've got a reference past the defined end of
11975 the table. This is probably a bug -- shall we warn? */
11976 size
= addend
+ file_align
;
11979 size
= (size
+ file_align
- 1) & -file_align
;
11981 /* Allocate one extra entry for use as a "done" flag for the
11982 consolidation pass. */
11983 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
11987 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
11993 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
11994 * sizeof (bfd_boolean
));
11995 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
11999 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
12004 /* And arrange for that done flag to be at index -1. */
12005 h
->vtable
->used
= ptr
+ 1;
12006 h
->vtable
->size
= size
;
12009 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
12014 struct alloc_got_off_arg
{
12016 struct bfd_link_info
*info
;
12019 /* We need a special top-level link routine to convert got reference counts
12020 to real got offsets. */
12023 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
12025 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
12026 bfd
*obfd
= gofarg
->info
->output_bfd
;
12027 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
12029 if (h
->root
.type
== bfd_link_hash_warning
)
12030 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12032 if (h
->got
.refcount
> 0)
12034 h
->got
.offset
= gofarg
->gotoff
;
12035 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
12038 h
->got
.offset
= (bfd_vma
) -1;
12043 /* And an accompanying bit to work out final got entry offsets once
12044 we're done. Should be called from final_link. */
12047 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
12048 struct bfd_link_info
*info
)
12051 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12053 struct alloc_got_off_arg gofarg
;
12055 BFD_ASSERT (abfd
== info
->output_bfd
);
12057 if (! is_elf_hash_table (info
->hash
))
12060 /* The GOT offset is relative to the .got section, but the GOT header is
12061 put into the .got.plt section, if the backend uses it. */
12062 if (bed
->want_got_plt
)
12065 gotoff
= bed
->got_header_size
;
12067 /* Do the local .got entries first. */
12068 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
12070 bfd_signed_vma
*local_got
;
12071 bfd_size_type j
, locsymcount
;
12072 Elf_Internal_Shdr
*symtab_hdr
;
12074 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
12077 local_got
= elf_local_got_refcounts (i
);
12081 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
12082 if (elf_bad_symtab (i
))
12083 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
12085 locsymcount
= symtab_hdr
->sh_info
;
12087 for (j
= 0; j
< locsymcount
; ++j
)
12089 if (local_got
[j
] > 0)
12091 local_got
[j
] = gotoff
;
12092 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
12095 local_got
[j
] = (bfd_vma
) -1;
12099 /* Then the global .got entries. .plt refcounts are handled by
12100 adjust_dynamic_symbol */
12101 gofarg
.gotoff
= gotoff
;
12102 gofarg
.info
= info
;
12103 elf_link_hash_traverse (elf_hash_table (info
),
12104 elf_gc_allocate_got_offsets
,
12109 /* Many folk need no more in the way of final link than this, once
12110 got entry reference counting is enabled. */
12113 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12115 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
12118 /* Invoke the regular ELF backend linker to do all the work. */
12119 return bfd_elf_final_link (abfd
, info
);
12123 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
12125 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
12127 if (rcookie
->bad_symtab
)
12128 rcookie
->rel
= rcookie
->rels
;
12130 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
12132 unsigned long r_symndx
;
12134 if (! rcookie
->bad_symtab
)
12135 if (rcookie
->rel
->r_offset
> offset
)
12137 if (rcookie
->rel
->r_offset
!= offset
)
12140 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
12141 if (r_symndx
== SHN_UNDEF
)
12144 if (r_symndx
>= rcookie
->locsymcount
12145 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
12147 struct elf_link_hash_entry
*h
;
12149 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
12151 while (h
->root
.type
== bfd_link_hash_indirect
12152 || h
->root
.type
== bfd_link_hash_warning
)
12153 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12155 if ((h
->root
.type
== bfd_link_hash_defined
12156 || h
->root
.type
== bfd_link_hash_defweak
)
12157 && elf_discarded_section (h
->root
.u
.def
.section
))
12164 /* It's not a relocation against a global symbol,
12165 but it could be a relocation against a local
12166 symbol for a discarded section. */
12168 Elf_Internal_Sym
*isym
;
12170 /* Need to: get the symbol; get the section. */
12171 isym
= &rcookie
->locsyms
[r_symndx
];
12172 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
12173 if (isec
!= NULL
&& elf_discarded_section (isec
))
12181 /* Discard unneeded references to discarded sections.
12182 Returns TRUE if any section's size was changed. */
12183 /* This function assumes that the relocations are in sorted order,
12184 which is true for all known assemblers. */
12187 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
12189 struct elf_reloc_cookie cookie
;
12190 asection
*stab
, *eh
;
12191 const struct elf_backend_data
*bed
;
12193 bfd_boolean ret
= FALSE
;
12195 if (info
->traditional_format
12196 || !is_elf_hash_table (info
->hash
))
12199 _bfd_elf_begin_eh_frame_parsing (info
);
12200 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
12202 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
12205 bed
= get_elf_backend_data (abfd
);
12207 if ((abfd
->flags
& DYNAMIC
) != 0)
12211 if (!info
->relocatable
)
12213 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
12216 || bfd_is_abs_section (eh
->output_section
)))
12220 stab
= bfd_get_section_by_name (abfd
, ".stab");
12222 && (stab
->size
== 0
12223 || bfd_is_abs_section (stab
->output_section
)
12224 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
12229 && bed
->elf_backend_discard_info
== NULL
)
12232 if (!init_reloc_cookie (&cookie
, info
, abfd
))
12236 && stab
->reloc_count
> 0
12237 && init_reloc_cookie_rels (&cookie
, info
, abfd
, stab
))
12239 if (_bfd_discard_section_stabs (abfd
, stab
,
12240 elf_section_data (stab
)->sec_info
,
12241 bfd_elf_reloc_symbol_deleted_p
,
12244 fini_reloc_cookie_rels (&cookie
, stab
);
12248 && init_reloc_cookie_rels (&cookie
, info
, abfd
, eh
))
12250 _bfd_elf_parse_eh_frame (abfd
, info
, eh
, &cookie
);
12251 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
12252 bfd_elf_reloc_symbol_deleted_p
,
12255 fini_reloc_cookie_rels (&cookie
, eh
);
12258 if (bed
->elf_backend_discard_info
!= NULL
12259 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
12262 fini_reloc_cookie (&cookie
, abfd
);
12264 _bfd_elf_end_eh_frame_parsing (info
);
12266 if (info
->eh_frame_hdr
12267 && !info
->relocatable
12268 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
12274 /* For a SHT_GROUP section, return the group signature. For other
12275 sections, return the normal section name. */
12277 static const char *
12278 section_signature (asection
*sec
)
12280 if ((sec
->flags
& SEC_GROUP
) != 0
12281 && elf_next_in_group (sec
) != NULL
12282 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
12283 return elf_group_name (elf_next_in_group (sec
));
12288 _bfd_elf_section_already_linked (bfd
*abfd
, asection
*sec
,
12289 struct bfd_link_info
*info
)
12292 const char *name
, *p
;
12293 struct bfd_section_already_linked
*l
;
12294 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
12296 if (sec
->output_section
== bfd_abs_section_ptr
)
12299 flags
= sec
->flags
;
12301 /* Return if it isn't a linkonce section. A comdat group section
12302 also has SEC_LINK_ONCE set. */
12303 if ((flags
& SEC_LINK_ONCE
) == 0)
12306 /* Don't put group member sections on our list of already linked
12307 sections. They are handled as a group via their group section. */
12308 if (elf_sec_group (sec
) != NULL
)
12311 /* FIXME: When doing a relocatable link, we may have trouble
12312 copying relocations in other sections that refer to local symbols
12313 in the section being discarded. Those relocations will have to
12314 be converted somehow; as of this writing I'm not sure that any of
12315 the backends handle that correctly.
12317 It is tempting to instead not discard link once sections when
12318 doing a relocatable link (technically, they should be discarded
12319 whenever we are building constructors). However, that fails,
12320 because the linker winds up combining all the link once sections
12321 into a single large link once section, which defeats the purpose
12322 of having link once sections in the first place.
12324 Also, not merging link once sections in a relocatable link
12325 causes trouble for MIPS ELF, which relies on link once semantics
12326 to handle the .reginfo section correctly. */
12328 name
= section_signature (sec
);
12330 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
12331 && (p
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
12336 already_linked_list
= bfd_section_already_linked_table_lookup (p
);
12338 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12340 /* We may have 2 different types of sections on the list: group
12341 sections and linkonce sections. Match like sections. */
12342 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
12343 && strcmp (name
, section_signature (l
->sec
)) == 0
12344 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
12346 /* The section has already been linked. See if we should
12347 issue a warning. */
12348 switch (flags
& SEC_LINK_DUPLICATES
)
12353 case SEC_LINK_DUPLICATES_DISCARD
:
12356 case SEC_LINK_DUPLICATES_ONE_ONLY
:
12357 (*_bfd_error_handler
)
12358 (_("%B: ignoring duplicate section `%A'"),
12362 case SEC_LINK_DUPLICATES_SAME_SIZE
:
12363 if (sec
->size
!= l
->sec
->size
)
12364 (*_bfd_error_handler
)
12365 (_("%B: duplicate section `%A' has different size"),
12369 case SEC_LINK_DUPLICATES_SAME_CONTENTS
:
12370 if (sec
->size
!= l
->sec
->size
)
12371 (*_bfd_error_handler
)
12372 (_("%B: duplicate section `%A' has different size"),
12374 else if (sec
->size
!= 0)
12376 bfd_byte
*sec_contents
, *l_sec_contents
;
12378 if (!bfd_malloc_and_get_section (abfd
, sec
, &sec_contents
))
12379 (*_bfd_error_handler
)
12380 (_("%B: warning: could not read contents of section `%A'"),
12382 else if (!bfd_malloc_and_get_section (l
->sec
->owner
, l
->sec
,
12384 (*_bfd_error_handler
)
12385 (_("%B: warning: could not read contents of section `%A'"),
12386 l
->sec
->owner
, l
->sec
);
12387 else if (memcmp (sec_contents
, l_sec_contents
, sec
->size
) != 0)
12388 (*_bfd_error_handler
)
12389 (_("%B: warning: duplicate section `%A' has different contents"),
12393 free (sec_contents
);
12394 if (l_sec_contents
)
12395 free (l_sec_contents
);
12400 /* Set the output_section field so that lang_add_section
12401 does not create a lang_input_section structure for this
12402 section. Since there might be a symbol in the section
12403 being discarded, we must retain a pointer to the section
12404 which we are really going to use. */
12405 sec
->output_section
= bfd_abs_section_ptr
;
12406 sec
->kept_section
= l
->sec
;
12408 if (flags
& SEC_GROUP
)
12410 asection
*first
= elf_next_in_group (sec
);
12411 asection
*s
= first
;
12415 s
->output_section
= bfd_abs_section_ptr
;
12416 /* Record which group discards it. */
12417 s
->kept_section
= l
->sec
;
12418 s
= elf_next_in_group (s
);
12419 /* These lists are circular. */
12429 /* A single member comdat group section may be discarded by a
12430 linkonce section and vice versa. */
12432 if ((flags
& SEC_GROUP
) != 0)
12434 asection
*first
= elf_next_in_group (sec
);
12436 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
12437 /* Check this single member group against linkonce sections. */
12438 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12439 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12440 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
12441 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
12443 first
->output_section
= bfd_abs_section_ptr
;
12444 first
->kept_section
= l
->sec
;
12445 sec
->output_section
= bfd_abs_section_ptr
;
12450 /* Check this linkonce section against single member groups. */
12451 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12452 if (l
->sec
->flags
& SEC_GROUP
)
12454 asection
*first
= elf_next_in_group (l
->sec
);
12457 && elf_next_in_group (first
) == first
12458 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
12460 sec
->output_section
= bfd_abs_section_ptr
;
12461 sec
->kept_section
= first
;
12466 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12467 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12468 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12469 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12470 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12471 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12472 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12473 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12474 The reverse order cannot happen as there is never a bfd with only the
12475 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12476 matter as here were are looking only for cross-bfd sections. */
12478 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
12479 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12480 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12481 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
12483 if (abfd
!= l
->sec
->owner
)
12484 sec
->output_section
= bfd_abs_section_ptr
;
12488 /* This is the first section with this name. Record it. */
12489 if (! bfd_section_already_linked_table_insert (already_linked_list
, sec
))
12490 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
12494 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
12496 return sym
->st_shndx
== SHN_COMMON
;
12500 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
12506 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
12508 return bfd_com_section_ptr
;
12512 _bfd_elf_default_got_elt_size (bfd
*abfd
,
12513 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
12514 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
12515 bfd
*ibfd ATTRIBUTE_UNUSED
,
12516 unsigned long symndx ATTRIBUTE_UNUSED
)
12518 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12519 return bed
->s
->arch_size
/ 8;
12522 /* Routines to support the creation of dynamic relocs. */
12524 /* Return true if NAME is a name of a relocation
12525 section associated with section S. */
12528 is_reloc_section (bfd_boolean rela
, const char * name
, asection
* s
)
12531 return CONST_STRNEQ (name
, ".rela")
12532 && strcmp (bfd_get_section_name (NULL
, s
), name
+ 5) == 0;
12534 return CONST_STRNEQ (name
, ".rel")
12535 && strcmp (bfd_get_section_name (NULL
, s
), name
+ 4) == 0;
12538 /* Returns the name of the dynamic reloc section associated with SEC. */
12540 static const char *
12541 get_dynamic_reloc_section_name (bfd
* abfd
,
12543 bfd_boolean is_rela
)
12546 unsigned int strndx
= elf_elfheader (abfd
)->e_shstrndx
;
12547 unsigned int shnam
= elf_section_data (sec
)->rel_hdr
.sh_name
;
12549 name
= bfd_elf_string_from_elf_section (abfd
, strndx
, shnam
);
12553 if (! is_reloc_section (is_rela
, name
, sec
))
12555 static bfd_boolean complained
= FALSE
;
12559 (*_bfd_error_handler
)
12560 (_("%B: bad relocation section name `%s\'"), abfd
, name
);
12569 /* Returns the dynamic reloc section associated with SEC.
12570 If necessary compute the name of the dynamic reloc section based
12571 on SEC's name (looked up in ABFD's string table) and the setting
12575 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
12577 bfd_boolean is_rela
)
12579 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12581 if (reloc_sec
== NULL
)
12583 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12587 reloc_sec
= bfd_get_section_by_name (abfd
, name
);
12589 if (reloc_sec
!= NULL
)
12590 elf_section_data (sec
)->sreloc
= reloc_sec
;
12597 /* Returns the dynamic reloc section associated with SEC. If the
12598 section does not exist it is created and attached to the DYNOBJ
12599 bfd and stored in the SRELOC field of SEC's elf_section_data
12602 ALIGNMENT is the alignment for the newly created section and
12603 IS_RELA defines whether the name should be .rela.<SEC's name>
12604 or .rel.<SEC's name>. The section name is looked up in the
12605 string table associated with ABFD. */
12608 _bfd_elf_make_dynamic_reloc_section (asection
* sec
,
12610 unsigned int alignment
,
12612 bfd_boolean is_rela
)
12614 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12616 if (reloc_sec
== NULL
)
12618 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12623 reloc_sec
= bfd_get_section_by_name (dynobj
, name
);
12625 if (reloc_sec
== NULL
)
12629 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
12630 if ((sec
->flags
& SEC_ALLOC
) != 0)
12631 flags
|= SEC_ALLOC
| SEC_LOAD
;
12633 reloc_sec
= bfd_make_section_with_flags (dynobj
, name
, flags
);
12634 if (reloc_sec
!= NULL
)
12636 if (! bfd_set_section_alignment (dynobj
, reloc_sec
, alignment
))
12641 elf_section_data (sec
)->sreloc
= reloc_sec
;
12647 /* Copy the ELF symbol type associated with a linker hash entry. */
12649 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd ATTRIBUTE_UNUSED
,
12650 struct bfd_link_hash_entry
* hdest
,
12651 struct bfd_link_hash_entry
* hsrc
)
12653 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*)hdest
;
12654 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*)hsrc
;
12656 ehdest
->type
= ehsrc
->type
;