1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
28 #include "safe-ctype.h"
29 #include "libiberty.h"
32 /* Define a symbol in a dynamic linkage section. */
34 struct elf_link_hash_entry
*
35 _bfd_elf_define_linkage_sym (bfd
*abfd
,
36 struct bfd_link_info
*info
,
40 struct elf_link_hash_entry
*h
;
41 struct bfd_link_hash_entry
*bh
;
42 const struct elf_backend_data
*bed
;
44 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
47 /* Zap symbol defined in an as-needed lib that wasn't linked.
48 This is a symptom of a larger problem: Absolute symbols
49 defined in shared libraries can't be overridden, because we
50 lose the link to the bfd which is via the symbol section. */
51 h
->root
.type
= bfd_link_hash_new
;
55 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
57 get_elf_backend_data (abfd
)->collect
,
60 h
= (struct elf_link_hash_entry
*) bh
;
63 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
65 bed
= get_elf_backend_data (abfd
);
66 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
71 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
75 struct elf_link_hash_entry
*h
;
76 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
79 /* This function may be called more than once. */
80 s
= bfd_get_section_by_name (abfd
, ".got");
81 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
84 switch (bed
->s
->arch_size
)
95 bfd_set_error (bfd_error_bad_value
);
99 flags
= bed
->dynamic_sec_flags
;
101 s
= bfd_make_section_with_flags (abfd
, ".got", flags
);
103 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
106 if (bed
->want_got_plt
)
108 s
= bfd_make_section_with_flags (abfd
, ".got.plt", flags
);
110 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
114 if (bed
->want_got_sym
)
116 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
117 (or .got.plt) section. We don't do this in the linker script
118 because we don't want to define the symbol if we are not creating
119 a global offset table. */
120 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_GLOBAL_OFFSET_TABLE_");
121 elf_hash_table (info
)->hgot
= h
;
126 /* The first bit of the global offset table is the header. */
127 s
->size
+= bed
->got_header_size
;
132 /* Create a strtab to hold the dynamic symbol names. */
134 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
136 struct elf_link_hash_table
*hash_table
;
138 hash_table
= elf_hash_table (info
);
139 if (hash_table
->dynobj
== NULL
)
140 hash_table
->dynobj
= abfd
;
142 if (hash_table
->dynstr
== NULL
)
144 hash_table
->dynstr
= _bfd_elf_strtab_init ();
145 if (hash_table
->dynstr
== NULL
)
151 /* Create some sections which will be filled in with dynamic linking
152 information. ABFD is an input file which requires dynamic sections
153 to be created. The dynamic sections take up virtual memory space
154 when the final executable is run, so we need to create them before
155 addresses are assigned to the output sections. We work out the
156 actual contents and size of these sections later. */
159 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
162 register asection
*s
;
163 const struct elf_backend_data
*bed
;
165 if (! is_elf_hash_table (info
->hash
))
168 if (elf_hash_table (info
)->dynamic_sections_created
)
171 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
174 abfd
= elf_hash_table (info
)->dynobj
;
175 bed
= get_elf_backend_data (abfd
);
177 flags
= bed
->dynamic_sec_flags
;
179 /* A dynamically linked executable has a .interp section, but a
180 shared library does not. */
181 if (info
->executable
)
183 s
= bfd_make_section_with_flags (abfd
, ".interp",
184 flags
| SEC_READONLY
);
189 /* Create sections to hold version informations. These are removed
190 if they are not needed. */
191 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_d",
192 flags
| SEC_READONLY
);
194 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
197 s
= bfd_make_section_with_flags (abfd
, ".gnu.version",
198 flags
| SEC_READONLY
);
200 || ! bfd_set_section_alignment (abfd
, s
, 1))
203 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_r",
204 flags
| SEC_READONLY
);
206 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
209 s
= bfd_make_section_with_flags (abfd
, ".dynsym",
210 flags
| SEC_READONLY
);
212 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
215 s
= bfd_make_section_with_flags (abfd
, ".dynstr",
216 flags
| SEC_READONLY
);
220 s
= bfd_make_section_with_flags (abfd
, ".dynamic", flags
);
222 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
225 /* The special symbol _DYNAMIC is always set to the start of the
226 .dynamic section. We could set _DYNAMIC in a linker script, but we
227 only want to define it if we are, in fact, creating a .dynamic
228 section. We don't want to define it if there is no .dynamic
229 section, since on some ELF platforms the start up code examines it
230 to decide how to initialize the process. */
231 if (!_bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC"))
236 s
= bfd_make_section_with_flags (abfd
, ".hash", flags
| SEC_READONLY
);
238 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
240 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
243 if (info
->emit_gnu_hash
)
245 s
= bfd_make_section_with_flags (abfd
, ".gnu.hash",
246 flags
| SEC_READONLY
);
248 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
250 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
251 4 32-bit words followed by variable count of 64-bit words, then
252 variable count of 32-bit words. */
253 if (bed
->s
->arch_size
== 64)
254 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
256 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
259 /* Let the backend create the rest of the sections. This lets the
260 backend set the right flags. The backend will normally create
261 the .got and .plt sections. */
262 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
265 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
270 /* Create dynamic sections when linking against a dynamic object. */
273 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
275 flagword flags
, pltflags
;
276 struct elf_link_hash_entry
*h
;
278 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
280 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
281 .rel[a].bss sections. */
282 flags
= bed
->dynamic_sec_flags
;
285 if (bed
->plt_not_loaded
)
286 /* We do not clear SEC_ALLOC here because we still want the OS to
287 allocate space for the section; it's just that there's nothing
288 to read in from the object file. */
289 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
291 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
292 if (bed
->plt_readonly
)
293 pltflags
|= SEC_READONLY
;
295 s
= bfd_make_section_with_flags (abfd
, ".plt", pltflags
);
297 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
300 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
302 if (bed
->want_plt_sym
)
304 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
305 "_PROCEDURE_LINKAGE_TABLE_");
306 elf_hash_table (info
)->hplt
= h
;
311 s
= bfd_make_section_with_flags (abfd
,
312 (bed
->default_use_rela_p
313 ? ".rela.plt" : ".rel.plt"),
314 flags
| SEC_READONLY
);
316 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
319 if (! _bfd_elf_create_got_section (abfd
, info
))
322 if (bed
->want_dynbss
)
324 /* The .dynbss section is a place to put symbols which are defined
325 by dynamic objects, are referenced by regular objects, and are
326 not functions. We must allocate space for them in the process
327 image and use a R_*_COPY reloc to tell the dynamic linker to
328 initialize them at run time. The linker script puts the .dynbss
329 section into the .bss section of the final image. */
330 s
= bfd_make_section_with_flags (abfd
, ".dynbss",
332 | SEC_LINKER_CREATED
));
336 /* The .rel[a].bss section holds copy relocs. This section is not
337 normally needed. We need to create it here, though, so that the
338 linker will map it to an output section. We can't just create it
339 only if we need it, because we will not know whether we need it
340 until we have seen all the input files, and the first time the
341 main linker code calls BFD after examining all the input files
342 (size_dynamic_sections) the input sections have already been
343 mapped to the output sections. If the section turns out not to
344 be needed, we can discard it later. We will never need this
345 section when generating a shared object, since they do not use
349 s
= bfd_make_section_with_flags (abfd
,
350 (bed
->default_use_rela_p
351 ? ".rela.bss" : ".rel.bss"),
352 flags
| SEC_READONLY
);
354 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
362 /* Record a new dynamic symbol. We record the dynamic symbols as we
363 read the input files, since we need to have a list of all of them
364 before we can determine the final sizes of the output sections.
365 Note that we may actually call this function even though we are not
366 going to output any dynamic symbols; in some cases we know that a
367 symbol should be in the dynamic symbol table, but only if there is
371 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
372 struct elf_link_hash_entry
*h
)
374 if (h
->dynindx
== -1)
376 struct elf_strtab_hash
*dynstr
;
381 /* XXX: The ABI draft says the linker must turn hidden and
382 internal symbols into STB_LOCAL symbols when producing the
383 DSO. However, if ld.so honors st_other in the dynamic table,
384 this would not be necessary. */
385 switch (ELF_ST_VISIBILITY (h
->other
))
389 if (h
->root
.type
!= bfd_link_hash_undefined
390 && h
->root
.type
!= bfd_link_hash_undefweak
)
393 if (!elf_hash_table (info
)->is_relocatable_executable
)
401 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
402 ++elf_hash_table (info
)->dynsymcount
;
404 dynstr
= elf_hash_table (info
)->dynstr
;
407 /* Create a strtab to hold the dynamic symbol names. */
408 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
413 /* We don't put any version information in the dynamic string
415 name
= h
->root
.root
.string
;
416 p
= strchr (name
, ELF_VER_CHR
);
418 /* We know that the p points into writable memory. In fact,
419 there are only a few symbols that have read-only names, being
420 those like _GLOBAL_OFFSET_TABLE_ that are created specially
421 by the backends. Most symbols will have names pointing into
422 an ELF string table read from a file, or to objalloc memory. */
425 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
430 if (indx
== (bfd_size_type
) -1)
432 h
->dynstr_index
= indx
;
438 /* Mark a symbol dynamic. */
441 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
442 struct elf_link_hash_entry
*h
,
443 Elf_Internal_Sym
*sym
)
445 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
447 /* It may be called more than once on the same H. */
448 if(h
->dynamic
|| info
->relocatable
)
451 if ((info
->dynamic_data
452 && (h
->type
== STT_OBJECT
454 && ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
)))
456 && h
->root
.type
== bfd_link_hash_new
457 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
461 /* Record an assignment to a symbol made by a linker script. We need
462 this in case some dynamic object refers to this symbol. */
465 bfd_elf_record_link_assignment (bfd
*output_bfd
,
466 struct bfd_link_info
*info
,
471 struct elf_link_hash_entry
*h
, *hv
;
472 struct elf_link_hash_table
*htab
;
473 const struct elf_backend_data
*bed
;
475 if (!is_elf_hash_table (info
->hash
))
478 htab
= elf_hash_table (info
);
479 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
483 switch (h
->root
.type
)
485 case bfd_link_hash_defined
:
486 case bfd_link_hash_defweak
:
487 case bfd_link_hash_common
:
489 case bfd_link_hash_undefweak
:
490 case bfd_link_hash_undefined
:
491 /* Since we're defining the symbol, don't let it seem to have not
492 been defined. record_dynamic_symbol and size_dynamic_sections
493 may depend on this. */
494 h
->root
.type
= bfd_link_hash_new
;
495 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
496 bfd_link_repair_undef_list (&htab
->root
);
498 case bfd_link_hash_new
:
499 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
502 case bfd_link_hash_indirect
:
503 /* We had a versioned symbol in a dynamic library. We make the
504 the versioned symbol point to this one. */
505 bed
= get_elf_backend_data (output_bfd
);
507 while (hv
->root
.type
== bfd_link_hash_indirect
508 || hv
->root
.type
== bfd_link_hash_warning
)
509 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
510 /* We don't need to update h->root.u since linker will set them
512 h
->root
.type
= bfd_link_hash_undefined
;
513 hv
->root
.type
= bfd_link_hash_indirect
;
514 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
515 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
517 case bfd_link_hash_warning
:
522 /* If this symbol is being provided by the linker script, and it is
523 currently defined by a dynamic object, but not by a regular
524 object, then mark it as undefined so that the generic linker will
525 force the correct value. */
529 h
->root
.type
= bfd_link_hash_undefined
;
531 /* If this symbol is not being provided by the linker script, and it is
532 currently defined by a dynamic object, but not by a regular object,
533 then clear out any version information because the symbol will not be
534 associated with the dynamic object any more. */
538 h
->verinfo
.verdef
= NULL
;
542 if (provide
&& hidden
)
544 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
546 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
547 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
550 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
552 if (!info
->relocatable
554 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
555 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
561 || (info
->executable
&& elf_hash_table (info
)->is_relocatable_executable
))
564 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
567 /* If this is a weak defined symbol, and we know a corresponding
568 real symbol from the same dynamic object, make sure the real
569 symbol is also made into a dynamic symbol. */
570 if (h
->u
.weakdef
!= NULL
571 && h
->u
.weakdef
->dynindx
== -1)
573 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
581 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
582 success, and 2 on a failure caused by attempting to record a symbol
583 in a discarded section, eg. a discarded link-once section symbol. */
586 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
591 struct elf_link_local_dynamic_entry
*entry
;
592 struct elf_link_hash_table
*eht
;
593 struct elf_strtab_hash
*dynstr
;
594 unsigned long dynstr_index
;
596 Elf_External_Sym_Shndx eshndx
;
597 char esym
[sizeof (Elf64_External_Sym
)];
599 if (! is_elf_hash_table (info
->hash
))
602 /* See if the entry exists already. */
603 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
604 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
607 amt
= sizeof (*entry
);
608 entry
= bfd_alloc (input_bfd
, amt
);
612 /* Go find the symbol, so that we can find it's name. */
613 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
614 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
616 bfd_release (input_bfd
, entry
);
620 if (entry
->isym
.st_shndx
!= SHN_UNDEF
621 && (entry
->isym
.st_shndx
< SHN_LORESERVE
622 || entry
->isym
.st_shndx
> SHN_HIRESERVE
))
626 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
627 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
629 /* We can still bfd_release here as nothing has done another
630 bfd_alloc. We can't do this later in this function. */
631 bfd_release (input_bfd
, entry
);
636 name
= (bfd_elf_string_from_elf_section
637 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
638 entry
->isym
.st_name
));
640 dynstr
= elf_hash_table (info
)->dynstr
;
643 /* Create a strtab to hold the dynamic symbol names. */
644 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
649 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
650 if (dynstr_index
== (unsigned long) -1)
652 entry
->isym
.st_name
= dynstr_index
;
654 eht
= elf_hash_table (info
);
656 entry
->next
= eht
->dynlocal
;
657 eht
->dynlocal
= entry
;
658 entry
->input_bfd
= input_bfd
;
659 entry
->input_indx
= input_indx
;
662 /* Whatever binding the symbol had before, it's now local. */
664 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
666 /* The dynindx will be set at the end of size_dynamic_sections. */
671 /* Return the dynindex of a local dynamic symbol. */
674 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
678 struct elf_link_local_dynamic_entry
*e
;
680 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
681 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
686 /* This function is used to renumber the dynamic symbols, if some of
687 them are removed because they are marked as local. This is called
688 via elf_link_hash_traverse. */
691 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
694 size_t *count
= data
;
696 if (h
->root
.type
== bfd_link_hash_warning
)
697 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
702 if (h
->dynindx
!= -1)
703 h
->dynindx
= ++(*count
);
709 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
710 STB_LOCAL binding. */
713 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
716 size_t *count
= data
;
718 if (h
->root
.type
== bfd_link_hash_warning
)
719 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
721 if (!h
->forced_local
)
724 if (h
->dynindx
!= -1)
725 h
->dynindx
= ++(*count
);
730 /* Return true if the dynamic symbol for a given section should be
731 omitted when creating a shared library. */
733 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
734 struct bfd_link_info
*info
,
737 struct elf_link_hash_table
*htab
;
739 switch (elf_section_data (p
)->this_hdr
.sh_type
)
743 /* If sh_type is yet undecided, assume it could be
744 SHT_PROGBITS/SHT_NOBITS. */
746 htab
= elf_hash_table (info
);
747 if (p
== htab
->tls_sec
)
750 if (htab
->text_index_section
!= NULL
)
751 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
753 if (strcmp (p
->name
, ".got") == 0
754 || strcmp (p
->name
, ".got.plt") == 0
755 || strcmp (p
->name
, ".plt") == 0)
759 if (htab
->dynobj
!= NULL
760 && (ip
= bfd_get_section_by_name (htab
->dynobj
, p
->name
)) != NULL
761 && (ip
->flags
& SEC_LINKER_CREATED
)
762 && ip
->output_section
== p
)
767 /* There shouldn't be section relative relocations
768 against any other section. */
774 /* Assign dynsym indices. In a shared library we generate a section
775 symbol for each output section, which come first. Next come symbols
776 which have been forced to local binding. Then all of the back-end
777 allocated local dynamic syms, followed by the rest of the global
781 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
782 struct bfd_link_info
*info
,
783 unsigned long *section_sym_count
)
785 unsigned long dynsymcount
= 0;
787 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
789 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
791 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
792 if ((p
->flags
& SEC_EXCLUDE
) == 0
793 && (p
->flags
& SEC_ALLOC
) != 0
794 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
795 elf_section_data (p
)->dynindx
= ++dynsymcount
;
797 elf_section_data (p
)->dynindx
= 0;
799 *section_sym_count
= dynsymcount
;
801 elf_link_hash_traverse (elf_hash_table (info
),
802 elf_link_renumber_local_hash_table_dynsyms
,
805 if (elf_hash_table (info
)->dynlocal
)
807 struct elf_link_local_dynamic_entry
*p
;
808 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
809 p
->dynindx
= ++dynsymcount
;
812 elf_link_hash_traverse (elf_hash_table (info
),
813 elf_link_renumber_hash_table_dynsyms
,
816 /* There is an unused NULL entry at the head of the table which
817 we must account for in our count. Unless there weren't any
818 symbols, which means we'll have no table at all. */
819 if (dynsymcount
!= 0)
822 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
826 /* This function is called when we want to define a new symbol. It
827 handles the various cases which arise when we find a definition in
828 a dynamic object, or when there is already a definition in a
829 dynamic object. The new symbol is described by NAME, SYM, PSEC,
830 and PVALUE. We set SYM_HASH to the hash table entry. We set
831 OVERRIDE if the old symbol is overriding a new definition. We set
832 TYPE_CHANGE_OK if it is OK for the type to change. We set
833 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
834 change, we mean that we shouldn't warn if the type or size does
835 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
836 object is overridden by a regular object. */
839 _bfd_elf_merge_symbol (bfd
*abfd
,
840 struct bfd_link_info
*info
,
842 Elf_Internal_Sym
*sym
,
845 unsigned int *pold_alignment
,
846 struct elf_link_hash_entry
**sym_hash
,
848 bfd_boolean
*override
,
849 bfd_boolean
*type_change_ok
,
850 bfd_boolean
*size_change_ok
)
852 asection
*sec
, *oldsec
;
853 struct elf_link_hash_entry
*h
;
854 struct elf_link_hash_entry
*flip
;
857 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
858 bfd_boolean newweak
, oldweak
;
859 const struct elf_backend_data
*bed
;
865 bind
= ELF_ST_BIND (sym
->st_info
);
867 /* Silently discard TLS symbols from --just-syms. There's no way to
868 combine a static TLS block with a new TLS block for this executable. */
869 if (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
870 && sec
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
876 if (! bfd_is_und_section (sec
))
877 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
879 h
= ((struct elf_link_hash_entry
*)
880 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
885 /* This code is for coping with dynamic objects, and is only useful
886 if we are doing an ELF link. */
887 if (info
->output_bfd
->xvec
!= abfd
->xvec
)
890 /* For merging, we only care about real symbols. */
892 while (h
->root
.type
== bfd_link_hash_indirect
893 || h
->root
.type
== bfd_link_hash_warning
)
894 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
896 /* We have to check it for every instance since the first few may be
897 refereences and not all compilers emit symbol type for undefined
899 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
901 /* If we just created the symbol, mark it as being an ELF symbol.
902 Other than that, there is nothing to do--there is no merge issue
903 with a newly defined symbol--so we just return. */
905 if (h
->root
.type
== bfd_link_hash_new
)
911 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
914 switch (h
->root
.type
)
921 case bfd_link_hash_undefined
:
922 case bfd_link_hash_undefweak
:
923 oldbfd
= h
->root
.u
.undef
.abfd
;
927 case bfd_link_hash_defined
:
928 case bfd_link_hash_defweak
:
929 oldbfd
= h
->root
.u
.def
.section
->owner
;
930 oldsec
= h
->root
.u
.def
.section
;
933 case bfd_link_hash_common
:
934 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
935 oldsec
= h
->root
.u
.c
.p
->section
;
939 /* In cases involving weak versioned symbols, we may wind up trying
940 to merge a symbol with itself. Catch that here, to avoid the
941 confusion that results if we try to override a symbol with
942 itself. The additional tests catch cases like
943 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
944 dynamic object, which we do want to handle here. */
946 && ((abfd
->flags
& DYNAMIC
) == 0
950 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
951 respectively, is from a dynamic object. */
953 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
957 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
958 else if (oldsec
!= NULL
)
960 /* This handles the special SHN_MIPS_{TEXT,DATA} section
961 indices used by MIPS ELF. */
962 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
965 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
966 respectively, appear to be a definition rather than reference. */
968 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
970 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
971 && h
->root
.type
!= bfd_link_hash_undefweak
972 && h
->root
.type
!= bfd_link_hash_common
);
974 bed
= get_elf_backend_data (abfd
);
975 /* When we try to create a default indirect symbol from the dynamic
976 definition with the default version, we skip it if its type and
977 the type of existing regular definition mismatch. We only do it
978 if the existing regular definition won't be dynamic. */
979 if (pold_alignment
== NULL
981 && !info
->export_dynamic
986 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
987 && ELF_ST_TYPE (sym
->st_info
) != h
->type
988 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
989 && h
->type
!= STT_NOTYPE
990 && !(bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
))
991 && bed
->is_function_type (h
->type
)))
997 /* Check TLS symbol. We don't check undefined symbol introduced by
999 if ((ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
)
1000 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1004 bfd_boolean ntdef
, tdef
;
1005 asection
*ntsec
, *tsec
;
1007 if (h
->type
== STT_TLS
)
1027 (*_bfd_error_handler
)
1028 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1029 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1030 else if (!tdef
&& !ntdef
)
1031 (*_bfd_error_handler
)
1032 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1033 tbfd
, ntbfd
, h
->root
.root
.string
);
1035 (*_bfd_error_handler
)
1036 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1037 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1039 (*_bfd_error_handler
)
1040 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1041 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1043 bfd_set_error (bfd_error_bad_value
);
1047 /* We need to remember if a symbol has a definition in a dynamic
1048 object or is weak in all dynamic objects. Internal and hidden
1049 visibility will make it unavailable to dynamic objects. */
1050 if (newdyn
&& !h
->dynamic_def
)
1052 if (!bfd_is_und_section (sec
))
1056 /* Check if this symbol is weak in all dynamic objects. If it
1057 is the first time we see it in a dynamic object, we mark
1058 if it is weak. Otherwise, we clear it. */
1059 if (!h
->ref_dynamic
)
1061 if (bind
== STB_WEAK
)
1062 h
->dynamic_weak
= 1;
1064 else if (bind
!= STB_WEAK
)
1065 h
->dynamic_weak
= 0;
1069 /* If the old symbol has non-default visibility, we ignore the new
1070 definition from a dynamic object. */
1072 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1073 && !bfd_is_und_section (sec
))
1076 /* Make sure this symbol is dynamic. */
1078 /* A protected symbol has external availability. Make sure it is
1079 recorded as dynamic.
1081 FIXME: Should we check type and size for protected symbol? */
1082 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1083 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1088 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1091 /* If the new symbol with non-default visibility comes from a
1092 relocatable file and the old definition comes from a dynamic
1093 object, we remove the old definition. */
1094 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1096 /* Handle the case where the old dynamic definition is
1097 default versioned. We need to copy the symbol info from
1098 the symbol with default version to the normal one if it
1099 was referenced before. */
1102 const struct elf_backend_data
*bed
1103 = get_elf_backend_data (abfd
);
1104 struct elf_link_hash_entry
*vh
= *sym_hash
;
1105 vh
->root
.type
= h
->root
.type
;
1106 h
->root
.type
= bfd_link_hash_indirect
;
1107 (*bed
->elf_backend_copy_indirect_symbol
) (info
, vh
, h
);
1108 /* Protected symbols will override the dynamic definition
1109 with default version. */
1110 if (ELF_ST_VISIBILITY (sym
->st_other
) == STV_PROTECTED
)
1112 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) vh
;
1113 vh
->dynamic_def
= 1;
1114 vh
->ref_dynamic
= 1;
1118 h
->root
.type
= vh
->root
.type
;
1119 vh
->ref_dynamic
= 0;
1120 /* We have to hide it here since it was made dynamic
1121 global with extra bits when the symbol info was
1122 copied from the old dynamic definition. */
1123 (*bed
->elf_backend_hide_symbol
) (info
, vh
, TRUE
);
1131 if ((h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1132 && bfd_is_und_section (sec
))
1134 /* If the new symbol is undefined and the old symbol was
1135 also undefined before, we need to make sure
1136 _bfd_generic_link_add_one_symbol doesn't mess
1137 up the linker hash table undefs list. Since the old
1138 definition came from a dynamic object, it is still on the
1140 h
->root
.type
= bfd_link_hash_undefined
;
1141 h
->root
.u
.undef
.abfd
= abfd
;
1145 h
->root
.type
= bfd_link_hash_new
;
1146 h
->root
.u
.undef
.abfd
= NULL
;
1155 /* FIXME: Should we check type and size for protected symbol? */
1161 /* Differentiate strong and weak symbols. */
1162 newweak
= bind
== STB_WEAK
;
1163 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1164 || h
->root
.type
== bfd_link_hash_undefweak
);
1166 /* If a new weak symbol definition comes from a regular file and the
1167 old symbol comes from a dynamic library, we treat the new one as
1168 strong. Similarly, an old weak symbol definition from a regular
1169 file is treated as strong when the new symbol comes from a dynamic
1170 library. Further, an old weak symbol from a dynamic library is
1171 treated as strong if the new symbol is from a dynamic library.
1172 This reflects the way glibc's ld.so works.
1174 Do this before setting *type_change_ok or *size_change_ok so that
1175 we warn properly when dynamic library symbols are overridden. */
1177 if (newdef
&& !newdyn
&& olddyn
)
1179 if (olddef
&& newdyn
)
1182 /* Allow changes between different types of funciton symbol. */
1183 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
))
1184 && bed
->is_function_type (h
->type
))
1185 *type_change_ok
= TRUE
;
1187 /* It's OK to change the type if either the existing symbol or the
1188 new symbol is weak. A type change is also OK if the old symbol
1189 is undefined and the new symbol is defined. */
1194 && h
->root
.type
== bfd_link_hash_undefined
))
1195 *type_change_ok
= TRUE
;
1197 /* It's OK to change the size if either the existing symbol or the
1198 new symbol is weak, or if the old symbol is undefined. */
1201 || h
->root
.type
== bfd_link_hash_undefined
)
1202 *size_change_ok
= TRUE
;
1204 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1205 symbol, respectively, appears to be a common symbol in a dynamic
1206 object. If a symbol appears in an uninitialized section, and is
1207 not weak, and is not a function, then it may be a common symbol
1208 which was resolved when the dynamic object was created. We want
1209 to treat such symbols specially, because they raise special
1210 considerations when setting the symbol size: if the symbol
1211 appears as a common symbol in a regular object, and the size in
1212 the regular object is larger, we must make sure that we use the
1213 larger size. This problematic case can always be avoided in C,
1214 but it must be handled correctly when using Fortran shared
1217 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1218 likewise for OLDDYNCOMMON and OLDDEF.
1220 Note that this test is just a heuristic, and that it is quite
1221 possible to have an uninitialized symbol in a shared object which
1222 is really a definition, rather than a common symbol. This could
1223 lead to some minor confusion when the symbol really is a common
1224 symbol in some regular object. However, I think it will be
1230 && (sec
->flags
& SEC_ALLOC
) != 0
1231 && (sec
->flags
& SEC_LOAD
) == 0
1233 && !bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
1234 newdyncommon
= TRUE
;
1236 newdyncommon
= FALSE
;
1240 && h
->root
.type
== bfd_link_hash_defined
1242 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1243 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1245 && !bed
->is_function_type (h
->type
))
1246 olddyncommon
= TRUE
;
1248 olddyncommon
= FALSE
;
1250 /* We now know everything about the old and new symbols. We ask the
1251 backend to check if we can merge them. */
1252 if (bed
->merge_symbol
1253 && !bed
->merge_symbol (info
, sym_hash
, h
, sym
, psec
, pvalue
,
1254 pold_alignment
, skip
, override
,
1255 type_change_ok
, size_change_ok
,
1256 &newdyn
, &newdef
, &newdyncommon
, &newweak
,
1258 &olddyn
, &olddef
, &olddyncommon
, &oldweak
,
1262 /* If both the old and the new symbols look like common symbols in a
1263 dynamic object, set the size of the symbol to the larger of the
1268 && sym
->st_size
!= h
->size
)
1270 /* Since we think we have two common symbols, issue a multiple
1271 common warning if desired. Note that we only warn if the
1272 size is different. If the size is the same, we simply let
1273 the old symbol override the new one as normally happens with
1274 symbols defined in dynamic objects. */
1276 if (! ((*info
->callbacks
->multiple_common
)
1277 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1278 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1281 if (sym
->st_size
> h
->size
)
1282 h
->size
= sym
->st_size
;
1284 *size_change_ok
= TRUE
;
1287 /* If we are looking at a dynamic object, and we have found a
1288 definition, we need to see if the symbol was already defined by
1289 some other object. If so, we want to use the existing
1290 definition, and we do not want to report a multiple symbol
1291 definition error; we do this by clobbering *PSEC to be
1292 bfd_und_section_ptr.
1294 We treat a common symbol as a definition if the symbol in the
1295 shared library is a function, since common symbols always
1296 represent variables; this can cause confusion in principle, but
1297 any such confusion would seem to indicate an erroneous program or
1298 shared library. We also permit a common symbol in a regular
1299 object to override a weak symbol in a shared object. */
1304 || (h
->root
.type
== bfd_link_hash_common
1306 || bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
))))))
1310 newdyncommon
= FALSE
;
1312 *psec
= sec
= bfd_und_section_ptr
;
1313 *size_change_ok
= TRUE
;
1315 /* If we get here when the old symbol is a common symbol, then
1316 we are explicitly letting it override a weak symbol or
1317 function in a dynamic object, and we don't want to warn about
1318 a type change. If the old symbol is a defined symbol, a type
1319 change warning may still be appropriate. */
1321 if (h
->root
.type
== bfd_link_hash_common
)
1322 *type_change_ok
= TRUE
;
1325 /* Handle the special case of an old common symbol merging with a
1326 new symbol which looks like a common symbol in a shared object.
1327 We change *PSEC and *PVALUE to make the new symbol look like a
1328 common symbol, and let _bfd_generic_link_add_one_symbol do the
1332 && h
->root
.type
== bfd_link_hash_common
)
1336 newdyncommon
= FALSE
;
1337 *pvalue
= sym
->st_size
;
1338 *psec
= sec
= bed
->common_section (oldsec
);
1339 *size_change_ok
= TRUE
;
1342 /* Skip weak definitions of symbols that are already defined. */
1343 if (newdef
&& olddef
&& newweak
)
1346 /* If the old symbol is from a dynamic object, and the new symbol is
1347 a definition which is not from a dynamic object, then the new
1348 symbol overrides the old symbol. Symbols from regular files
1349 always take precedence over symbols from dynamic objects, even if
1350 they are defined after the dynamic object in the link.
1352 As above, we again permit a common symbol in a regular object to
1353 override a definition in a shared object if the shared object
1354 symbol is a function or is weak. */
1359 || (bfd_is_com_section (sec
)
1361 || bed
->is_function_type (h
->type
))))
1366 /* Change the hash table entry to undefined, and let
1367 _bfd_generic_link_add_one_symbol do the right thing with the
1370 h
->root
.type
= bfd_link_hash_undefined
;
1371 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1372 *size_change_ok
= TRUE
;
1375 olddyncommon
= FALSE
;
1377 /* We again permit a type change when a common symbol may be
1378 overriding a function. */
1380 if (bfd_is_com_section (sec
))
1381 *type_change_ok
= TRUE
;
1383 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1386 /* This union may have been set to be non-NULL when this symbol
1387 was seen in a dynamic object. We must force the union to be
1388 NULL, so that it is correct for a regular symbol. */
1389 h
->verinfo
.vertree
= NULL
;
1392 /* Handle the special case of a new common symbol merging with an
1393 old symbol that looks like it might be a common symbol defined in
1394 a shared object. Note that we have already handled the case in
1395 which a new common symbol should simply override the definition
1396 in the shared library. */
1399 && bfd_is_com_section (sec
)
1402 /* It would be best if we could set the hash table entry to a
1403 common symbol, but we don't know what to use for the section
1404 or the alignment. */
1405 if (! ((*info
->callbacks
->multiple_common
)
1406 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1407 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1410 /* If the presumed common symbol in the dynamic object is
1411 larger, pretend that the new symbol has its size. */
1413 if (h
->size
> *pvalue
)
1416 /* We need to remember the alignment required by the symbol
1417 in the dynamic object. */
1418 BFD_ASSERT (pold_alignment
);
1419 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1422 olddyncommon
= FALSE
;
1424 h
->root
.type
= bfd_link_hash_undefined
;
1425 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1427 *size_change_ok
= TRUE
;
1428 *type_change_ok
= TRUE
;
1430 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1433 h
->verinfo
.vertree
= NULL
;
1438 /* Handle the case where we had a versioned symbol in a dynamic
1439 library and now find a definition in a normal object. In this
1440 case, we make the versioned symbol point to the normal one. */
1441 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1442 flip
->root
.type
= h
->root
.type
;
1443 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1444 h
->root
.type
= bfd_link_hash_indirect
;
1445 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1446 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1450 flip
->ref_dynamic
= 1;
1457 /* This function is called to create an indirect symbol from the
1458 default for the symbol with the default version if needed. The
1459 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1460 set DYNSYM if the new indirect symbol is dynamic. */
1463 _bfd_elf_add_default_symbol (bfd
*abfd
,
1464 struct bfd_link_info
*info
,
1465 struct elf_link_hash_entry
*h
,
1467 Elf_Internal_Sym
*sym
,
1470 bfd_boolean
*dynsym
,
1471 bfd_boolean override
)
1473 bfd_boolean type_change_ok
;
1474 bfd_boolean size_change_ok
;
1477 struct elf_link_hash_entry
*hi
;
1478 struct bfd_link_hash_entry
*bh
;
1479 const struct elf_backend_data
*bed
;
1480 bfd_boolean collect
;
1481 bfd_boolean dynamic
;
1483 size_t len
, shortlen
;
1486 /* If this symbol has a version, and it is the default version, we
1487 create an indirect symbol from the default name to the fully
1488 decorated name. This will cause external references which do not
1489 specify a version to be bound to this version of the symbol. */
1490 p
= strchr (name
, ELF_VER_CHR
);
1491 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1496 /* We are overridden by an old definition. We need to check if we
1497 need to create the indirect symbol from the default name. */
1498 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1500 BFD_ASSERT (hi
!= NULL
);
1503 while (hi
->root
.type
== bfd_link_hash_indirect
1504 || hi
->root
.type
== bfd_link_hash_warning
)
1506 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1512 bed
= get_elf_backend_data (abfd
);
1513 collect
= bed
->collect
;
1514 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1516 shortlen
= p
- name
;
1517 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1518 if (shortname
== NULL
)
1520 memcpy (shortname
, name
, shortlen
);
1521 shortname
[shortlen
] = '\0';
1523 /* We are going to create a new symbol. Merge it with any existing
1524 symbol with this name. For the purposes of the merge, act as
1525 though we were defining the symbol we just defined, although we
1526 actually going to define an indirect symbol. */
1527 type_change_ok
= FALSE
;
1528 size_change_ok
= FALSE
;
1530 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1531 NULL
, &hi
, &skip
, &override
,
1532 &type_change_ok
, &size_change_ok
))
1541 if (! (_bfd_generic_link_add_one_symbol
1542 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1543 0, name
, FALSE
, collect
, &bh
)))
1545 hi
= (struct elf_link_hash_entry
*) bh
;
1549 /* In this case the symbol named SHORTNAME is overriding the
1550 indirect symbol we want to add. We were planning on making
1551 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1552 is the name without a version. NAME is the fully versioned
1553 name, and it is the default version.
1555 Overriding means that we already saw a definition for the
1556 symbol SHORTNAME in a regular object, and it is overriding
1557 the symbol defined in the dynamic object.
1559 When this happens, we actually want to change NAME, the
1560 symbol we just added, to refer to SHORTNAME. This will cause
1561 references to NAME in the shared object to become references
1562 to SHORTNAME in the regular object. This is what we expect
1563 when we override a function in a shared object: that the
1564 references in the shared object will be mapped to the
1565 definition in the regular object. */
1567 while (hi
->root
.type
== bfd_link_hash_indirect
1568 || hi
->root
.type
== bfd_link_hash_warning
)
1569 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1571 h
->root
.type
= bfd_link_hash_indirect
;
1572 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1576 hi
->ref_dynamic
= 1;
1580 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1585 /* Now set HI to H, so that the following code will set the
1586 other fields correctly. */
1590 /* Check if HI is a warning symbol. */
1591 if (hi
->root
.type
== bfd_link_hash_warning
)
1592 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1594 /* If there is a duplicate definition somewhere, then HI may not
1595 point to an indirect symbol. We will have reported an error to
1596 the user in that case. */
1598 if (hi
->root
.type
== bfd_link_hash_indirect
)
1600 struct elf_link_hash_entry
*ht
;
1602 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1603 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1605 /* See if the new flags lead us to realize that the symbol must
1617 if (hi
->ref_regular
)
1623 /* We also need to define an indirection from the nondefault version
1627 len
= strlen (name
);
1628 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1629 if (shortname
== NULL
)
1631 memcpy (shortname
, name
, shortlen
);
1632 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1634 /* Once again, merge with any existing symbol. */
1635 type_change_ok
= FALSE
;
1636 size_change_ok
= FALSE
;
1638 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1639 NULL
, &hi
, &skip
, &override
,
1640 &type_change_ok
, &size_change_ok
))
1648 /* Here SHORTNAME is a versioned name, so we don't expect to see
1649 the type of override we do in the case above unless it is
1650 overridden by a versioned definition. */
1651 if (hi
->root
.type
!= bfd_link_hash_defined
1652 && hi
->root
.type
!= bfd_link_hash_defweak
)
1653 (*_bfd_error_handler
)
1654 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1660 if (! (_bfd_generic_link_add_one_symbol
1661 (info
, abfd
, shortname
, BSF_INDIRECT
,
1662 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1664 hi
= (struct elf_link_hash_entry
*) bh
;
1666 /* If there is a duplicate definition somewhere, then HI may not
1667 point to an indirect symbol. We will have reported an error
1668 to the user in that case. */
1670 if (hi
->root
.type
== bfd_link_hash_indirect
)
1672 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1674 /* See if the new flags lead us to realize that the symbol
1686 if (hi
->ref_regular
)
1696 /* This routine is used to export all defined symbols into the dynamic
1697 symbol table. It is called via elf_link_hash_traverse. */
1700 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1702 struct elf_info_failed
*eif
= data
;
1704 /* Ignore this if we won't export it. */
1705 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
1708 /* Ignore indirect symbols. These are added by the versioning code. */
1709 if (h
->root
.type
== bfd_link_hash_indirect
)
1712 if (h
->root
.type
== bfd_link_hash_warning
)
1713 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1715 if (h
->dynindx
== -1
1719 struct bfd_elf_version_tree
*t
;
1720 struct bfd_elf_version_expr
*d
;
1722 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
1724 if (t
->globals
.list
!= NULL
)
1726 d
= (*t
->match
) (&t
->globals
, NULL
, h
->root
.root
.string
);
1731 if (t
->locals
.list
!= NULL
)
1733 d
= (*t
->match
) (&t
->locals
, NULL
, h
->root
.root
.string
);
1742 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1753 /* Look through the symbols which are defined in other shared
1754 libraries and referenced here. Update the list of version
1755 dependencies. This will be put into the .gnu.version_r section.
1756 This function is called via elf_link_hash_traverse. */
1759 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1762 struct elf_find_verdep_info
*rinfo
= data
;
1763 Elf_Internal_Verneed
*t
;
1764 Elf_Internal_Vernaux
*a
;
1767 if (h
->root
.type
== bfd_link_hash_warning
)
1768 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1770 /* We only care about symbols defined in shared objects with version
1775 || h
->verinfo
.verdef
== NULL
)
1778 /* See if we already know about this version. */
1779 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
1781 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1784 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1785 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1791 /* This is a new version. Add it to tree we are building. */
1796 t
= bfd_zalloc (rinfo
->output_bfd
, amt
);
1799 rinfo
->failed
= TRUE
;
1803 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1804 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
1805 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
1809 a
= bfd_zalloc (rinfo
->output_bfd
, amt
);
1812 rinfo
->failed
= TRUE
;
1816 /* Note that we are copying a string pointer here, and testing it
1817 above. If bfd_elf_string_from_elf_section is ever changed to
1818 discard the string data when low in memory, this will have to be
1820 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1822 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1823 a
->vna_nextptr
= t
->vn_auxptr
;
1825 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1828 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1835 /* Figure out appropriate versions for all the symbols. We may not
1836 have the version number script until we have read all of the input
1837 files, so until that point we don't know which symbols should be
1838 local. This function is called via elf_link_hash_traverse. */
1841 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1843 struct elf_assign_sym_version_info
*sinfo
;
1844 struct bfd_link_info
*info
;
1845 const struct elf_backend_data
*bed
;
1846 struct elf_info_failed eif
;
1853 if (h
->root
.type
== bfd_link_hash_warning
)
1854 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1856 /* Fix the symbol flags. */
1859 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1862 sinfo
->failed
= TRUE
;
1866 /* We only need version numbers for symbols defined in regular
1868 if (!h
->def_regular
)
1871 bed
= get_elf_backend_data (sinfo
->output_bfd
);
1872 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1873 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1875 struct bfd_elf_version_tree
*t
;
1880 /* There are two consecutive ELF_VER_CHR characters if this is
1881 not a hidden symbol. */
1883 if (*p
== ELF_VER_CHR
)
1889 /* If there is no version string, we can just return out. */
1897 /* Look for the version. If we find it, it is no longer weak. */
1898 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1900 if (strcmp (t
->name
, p
) == 0)
1904 struct bfd_elf_version_expr
*d
;
1906 len
= p
- h
->root
.root
.string
;
1907 alc
= bfd_malloc (len
);
1910 sinfo
->failed
= TRUE
;
1913 memcpy (alc
, h
->root
.root
.string
, len
- 1);
1914 alc
[len
- 1] = '\0';
1915 if (alc
[len
- 2] == ELF_VER_CHR
)
1916 alc
[len
- 2] = '\0';
1918 h
->verinfo
.vertree
= t
;
1922 if (t
->globals
.list
!= NULL
)
1923 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
1925 /* See if there is anything to force this symbol to
1927 if (d
== NULL
&& t
->locals
.list
!= NULL
)
1929 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
1932 && ! info
->export_dynamic
)
1933 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1941 /* If we are building an application, we need to create a
1942 version node for this version. */
1943 if (t
== NULL
&& info
->executable
)
1945 struct bfd_elf_version_tree
**pp
;
1948 /* If we aren't going to export this symbol, we don't need
1949 to worry about it. */
1950 if (h
->dynindx
== -1)
1954 t
= bfd_zalloc (sinfo
->output_bfd
, amt
);
1957 sinfo
->failed
= TRUE
;
1962 t
->name_indx
= (unsigned int) -1;
1966 /* Don't count anonymous version tag. */
1967 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
1969 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
1971 t
->vernum
= version_index
;
1975 h
->verinfo
.vertree
= t
;
1979 /* We could not find the version for a symbol when
1980 generating a shared archive. Return an error. */
1981 (*_bfd_error_handler
)
1982 (_("%B: version node not found for symbol %s"),
1983 sinfo
->output_bfd
, h
->root
.root
.string
);
1984 bfd_set_error (bfd_error_bad_value
);
1985 sinfo
->failed
= TRUE
;
1993 /* If we don't have a version for this symbol, see if we can find
1995 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
1997 struct bfd_elf_version_tree
*t
;
1998 struct bfd_elf_version_tree
*local_ver
;
1999 struct bfd_elf_version_expr
*d
;
2001 /* See if can find what version this symbol is in. If the
2002 symbol is supposed to be local, then don't actually register
2005 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2007 if (t
->globals
.list
!= NULL
)
2009 bfd_boolean matched
;
2013 while ((d
= (*t
->match
) (&t
->globals
, d
,
2014 h
->root
.root
.string
)) != NULL
)
2019 /* There is a version without definition. Make
2020 the symbol the default definition for this
2022 h
->verinfo
.vertree
= t
;
2030 /* There is no undefined version for this symbol. Hide the
2032 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2035 if (t
->locals
.list
!= NULL
)
2038 while ((d
= (*t
->match
) (&t
->locals
, d
,
2039 h
->root
.root
.string
)) != NULL
)
2042 /* If the match is "*", keep looking for a more
2043 explicit, perhaps even global, match.
2044 XXX: Shouldn't this be !d->wildcard instead? */
2045 if (d
->pattern
[0] != '*' || d
->pattern
[1] != '\0')
2054 if (local_ver
!= NULL
)
2056 h
->verinfo
.vertree
= local_ver
;
2057 if (h
->dynindx
!= -1
2058 && ! info
->export_dynamic
)
2060 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2068 /* Read and swap the relocs from the section indicated by SHDR. This
2069 may be either a REL or a RELA section. The relocations are
2070 translated into RELA relocations and stored in INTERNAL_RELOCS,
2071 which should have already been allocated to contain enough space.
2072 The EXTERNAL_RELOCS are a buffer where the external form of the
2073 relocations should be stored.
2075 Returns FALSE if something goes wrong. */
2078 elf_link_read_relocs_from_section (bfd
*abfd
,
2080 Elf_Internal_Shdr
*shdr
,
2081 void *external_relocs
,
2082 Elf_Internal_Rela
*internal_relocs
)
2084 const struct elf_backend_data
*bed
;
2085 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2086 const bfd_byte
*erela
;
2087 const bfd_byte
*erelaend
;
2088 Elf_Internal_Rela
*irela
;
2089 Elf_Internal_Shdr
*symtab_hdr
;
2092 /* Position ourselves at the start of the section. */
2093 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2096 /* Read the relocations. */
2097 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2100 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2101 nsyms
= symtab_hdr
->sh_size
/ symtab_hdr
->sh_entsize
;
2103 bed
= get_elf_backend_data (abfd
);
2105 /* Convert the external relocations to the internal format. */
2106 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2107 swap_in
= bed
->s
->swap_reloc_in
;
2108 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2109 swap_in
= bed
->s
->swap_reloca_in
;
2112 bfd_set_error (bfd_error_wrong_format
);
2116 erela
= external_relocs
;
2117 erelaend
= erela
+ shdr
->sh_size
;
2118 irela
= internal_relocs
;
2119 while (erela
< erelaend
)
2123 (*swap_in
) (abfd
, erela
, irela
);
2124 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2125 if (bed
->s
->arch_size
== 64)
2127 if ((size_t) r_symndx
>= nsyms
)
2129 (*_bfd_error_handler
)
2130 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2131 " for offset 0x%lx in section `%A'"),
2133 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2134 bfd_set_error (bfd_error_bad_value
);
2137 irela
+= bed
->s
->int_rels_per_ext_rel
;
2138 erela
+= shdr
->sh_entsize
;
2144 /* Read and swap the relocs for a section O. They may have been
2145 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2146 not NULL, they are used as buffers to read into. They are known to
2147 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2148 the return value is allocated using either malloc or bfd_alloc,
2149 according to the KEEP_MEMORY argument. If O has two relocation
2150 sections (both REL and RELA relocations), then the REL_HDR
2151 relocations will appear first in INTERNAL_RELOCS, followed by the
2152 REL_HDR2 relocations. */
2155 _bfd_elf_link_read_relocs (bfd
*abfd
,
2157 void *external_relocs
,
2158 Elf_Internal_Rela
*internal_relocs
,
2159 bfd_boolean keep_memory
)
2161 Elf_Internal_Shdr
*rel_hdr
;
2162 void *alloc1
= NULL
;
2163 Elf_Internal_Rela
*alloc2
= NULL
;
2164 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2166 if (elf_section_data (o
)->relocs
!= NULL
)
2167 return elf_section_data (o
)->relocs
;
2169 if (o
->reloc_count
== 0)
2172 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2174 if (internal_relocs
== NULL
)
2178 size
= o
->reloc_count
;
2179 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2181 internal_relocs
= bfd_alloc (abfd
, size
);
2183 internal_relocs
= alloc2
= bfd_malloc (size
);
2184 if (internal_relocs
== NULL
)
2188 if (external_relocs
== NULL
)
2190 bfd_size_type size
= rel_hdr
->sh_size
;
2192 if (elf_section_data (o
)->rel_hdr2
)
2193 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2194 alloc1
= bfd_malloc (size
);
2197 external_relocs
= alloc1
;
2200 if (!elf_link_read_relocs_from_section (abfd
, o
, rel_hdr
,
2204 if (elf_section_data (o
)->rel_hdr2
2205 && (!elf_link_read_relocs_from_section
2207 elf_section_data (o
)->rel_hdr2
,
2208 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2209 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2210 * bed
->s
->int_rels_per_ext_rel
))))
2213 /* Cache the results for next time, if we can. */
2215 elf_section_data (o
)->relocs
= internal_relocs
;
2220 /* Don't free alloc2, since if it was allocated we are passing it
2221 back (under the name of internal_relocs). */
2223 return internal_relocs
;
2233 /* Compute the size of, and allocate space for, REL_HDR which is the
2234 section header for a section containing relocations for O. */
2237 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2238 Elf_Internal_Shdr
*rel_hdr
,
2241 bfd_size_type reloc_count
;
2242 bfd_size_type num_rel_hashes
;
2244 /* Figure out how many relocations there will be. */
2245 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
2246 reloc_count
= elf_section_data (o
)->rel_count
;
2248 reloc_count
= elf_section_data (o
)->rel_count2
;
2250 num_rel_hashes
= o
->reloc_count
;
2251 if (num_rel_hashes
< reloc_count
)
2252 num_rel_hashes
= reloc_count
;
2254 /* That allows us to calculate the size of the section. */
2255 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
2257 /* The contents field must last into write_object_contents, so we
2258 allocate it with bfd_alloc rather than malloc. Also since we
2259 cannot be sure that the contents will actually be filled in,
2260 we zero the allocated space. */
2261 rel_hdr
->contents
= bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2262 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2265 /* We only allocate one set of hash entries, so we only do it the
2266 first time we are called. */
2267 if (elf_section_data (o
)->rel_hashes
== NULL
2270 struct elf_link_hash_entry
**p
;
2272 p
= bfd_zmalloc (num_rel_hashes
* sizeof (struct elf_link_hash_entry
*));
2276 elf_section_data (o
)->rel_hashes
= p
;
2282 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2283 originated from the section given by INPUT_REL_HDR) to the
2287 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2288 asection
*input_section
,
2289 Elf_Internal_Shdr
*input_rel_hdr
,
2290 Elf_Internal_Rela
*internal_relocs
,
2291 struct elf_link_hash_entry
**rel_hash
2294 Elf_Internal_Rela
*irela
;
2295 Elf_Internal_Rela
*irelaend
;
2297 Elf_Internal_Shdr
*output_rel_hdr
;
2298 asection
*output_section
;
2299 unsigned int *rel_countp
= NULL
;
2300 const struct elf_backend_data
*bed
;
2301 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2303 output_section
= input_section
->output_section
;
2304 output_rel_hdr
= NULL
;
2306 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
2307 == input_rel_hdr
->sh_entsize
)
2309 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
2310 rel_countp
= &elf_section_data (output_section
)->rel_count
;
2312 else if (elf_section_data (output_section
)->rel_hdr2
2313 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
2314 == input_rel_hdr
->sh_entsize
))
2316 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
2317 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
2321 (*_bfd_error_handler
)
2322 (_("%B: relocation size mismatch in %B section %A"),
2323 output_bfd
, input_section
->owner
, input_section
);
2324 bfd_set_error (bfd_error_wrong_format
);
2328 bed
= get_elf_backend_data (output_bfd
);
2329 if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2330 swap_out
= bed
->s
->swap_reloc_out
;
2331 else if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2332 swap_out
= bed
->s
->swap_reloca_out
;
2336 erel
= output_rel_hdr
->contents
;
2337 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
2338 irela
= internal_relocs
;
2339 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2340 * bed
->s
->int_rels_per_ext_rel
);
2341 while (irela
< irelaend
)
2343 (*swap_out
) (output_bfd
, irela
, erel
);
2344 irela
+= bed
->s
->int_rels_per_ext_rel
;
2345 erel
+= input_rel_hdr
->sh_entsize
;
2348 /* Bump the counter, so that we know where to add the next set of
2350 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2355 /* Make weak undefined symbols in PIE dynamic. */
2358 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2359 struct elf_link_hash_entry
*h
)
2363 && h
->root
.type
== bfd_link_hash_undefweak
)
2364 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2369 /* Fix up the flags for a symbol. This handles various cases which
2370 can only be fixed after all the input files are seen. This is
2371 currently called by both adjust_dynamic_symbol and
2372 assign_sym_version, which is unnecessary but perhaps more robust in
2373 the face of future changes. */
2376 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2377 struct elf_info_failed
*eif
)
2379 const struct elf_backend_data
*bed
;
2381 /* If this symbol was mentioned in a non-ELF file, try to set
2382 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2383 permit a non-ELF file to correctly refer to a symbol defined in
2384 an ELF dynamic object. */
2387 while (h
->root
.type
== bfd_link_hash_indirect
)
2388 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2390 if (h
->root
.type
!= bfd_link_hash_defined
2391 && h
->root
.type
!= bfd_link_hash_defweak
)
2394 h
->ref_regular_nonweak
= 1;
2398 if (h
->root
.u
.def
.section
->owner
!= NULL
2399 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2400 == bfd_target_elf_flavour
))
2403 h
->ref_regular_nonweak
= 1;
2409 if (h
->dynindx
== -1
2413 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2422 /* Unfortunately, NON_ELF is only correct if the symbol
2423 was first seen in a non-ELF file. Fortunately, if the symbol
2424 was first seen in an ELF file, we're probably OK unless the
2425 symbol was defined in a non-ELF file. Catch that case here.
2426 FIXME: We're still in trouble if the symbol was first seen in
2427 a dynamic object, and then later in a non-ELF regular object. */
2428 if ((h
->root
.type
== bfd_link_hash_defined
2429 || h
->root
.type
== bfd_link_hash_defweak
)
2431 && (h
->root
.u
.def
.section
->owner
!= NULL
2432 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2433 != bfd_target_elf_flavour
)
2434 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2435 && !h
->def_dynamic
)))
2439 /* Backend specific symbol fixup. */
2440 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2441 if (bed
->elf_backend_fixup_symbol
2442 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2445 /* If this is a final link, and the symbol was defined as a common
2446 symbol in a regular object file, and there was no definition in
2447 any dynamic object, then the linker will have allocated space for
2448 the symbol in a common section but the DEF_REGULAR
2449 flag will not have been set. */
2450 if (h
->root
.type
== bfd_link_hash_defined
2454 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2457 /* If -Bsymbolic was used (which means to bind references to global
2458 symbols to the definition within the shared object), and this
2459 symbol was defined in a regular object, then it actually doesn't
2460 need a PLT entry. Likewise, if the symbol has non-default
2461 visibility. If the symbol has hidden or internal visibility, we
2462 will force it local. */
2464 && eif
->info
->shared
2465 && is_elf_hash_table (eif
->info
->hash
)
2466 && (SYMBOLIC_BIND (eif
->info
, h
)
2467 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2470 bfd_boolean force_local
;
2472 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2473 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2474 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2477 /* If a weak undefined symbol has non-default visibility, we also
2478 hide it from the dynamic linker. */
2479 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2480 && h
->root
.type
== bfd_link_hash_undefweak
)
2481 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2483 /* If this is a weak defined symbol in a dynamic object, and we know
2484 the real definition in the dynamic object, copy interesting flags
2485 over to the real definition. */
2486 if (h
->u
.weakdef
!= NULL
)
2488 struct elf_link_hash_entry
*weakdef
;
2490 weakdef
= h
->u
.weakdef
;
2491 if (h
->root
.type
== bfd_link_hash_indirect
)
2492 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2494 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2495 || h
->root
.type
== bfd_link_hash_defweak
);
2496 BFD_ASSERT (weakdef
->def_dynamic
);
2498 /* If the real definition is defined by a regular object file,
2499 don't do anything special. See the longer description in
2500 _bfd_elf_adjust_dynamic_symbol, below. */
2501 if (weakdef
->def_regular
)
2502 h
->u
.weakdef
= NULL
;
2505 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2506 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2507 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2514 /* Make the backend pick a good value for a dynamic symbol. This is
2515 called via elf_link_hash_traverse, and also calls itself
2519 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2521 struct elf_info_failed
*eif
= data
;
2523 const struct elf_backend_data
*bed
;
2525 if (! is_elf_hash_table (eif
->info
->hash
))
2528 if (h
->root
.type
== bfd_link_hash_warning
)
2530 h
->got
= elf_hash_table (eif
->info
)->init_got_offset
;
2531 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2533 /* When warning symbols are created, they **replace** the "real"
2534 entry in the hash table, thus we never get to see the real
2535 symbol in a hash traversal. So look at it now. */
2536 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2539 /* Ignore indirect symbols. These are added by the versioning code. */
2540 if (h
->root
.type
== bfd_link_hash_indirect
)
2543 /* Fix the symbol flags. */
2544 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2547 /* If this symbol does not require a PLT entry, and it is not
2548 defined by a dynamic object, or is not referenced by a regular
2549 object, ignore it. We do have to handle a weak defined symbol,
2550 even if no regular object refers to it, if we decided to add it
2551 to the dynamic symbol table. FIXME: Do we normally need to worry
2552 about symbols which are defined by one dynamic object and
2553 referenced by another one? */
2558 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2560 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2564 /* If we've already adjusted this symbol, don't do it again. This
2565 can happen via a recursive call. */
2566 if (h
->dynamic_adjusted
)
2569 /* Don't look at this symbol again. Note that we must set this
2570 after checking the above conditions, because we may look at a
2571 symbol once, decide not to do anything, and then get called
2572 recursively later after REF_REGULAR is set below. */
2573 h
->dynamic_adjusted
= 1;
2575 /* If this is a weak definition, and we know a real definition, and
2576 the real symbol is not itself defined by a regular object file,
2577 then get a good value for the real definition. We handle the
2578 real symbol first, for the convenience of the backend routine.
2580 Note that there is a confusing case here. If the real definition
2581 is defined by a regular object file, we don't get the real symbol
2582 from the dynamic object, but we do get the weak symbol. If the
2583 processor backend uses a COPY reloc, then if some routine in the
2584 dynamic object changes the real symbol, we will not see that
2585 change in the corresponding weak symbol. This is the way other
2586 ELF linkers work as well, and seems to be a result of the shared
2589 I will clarify this issue. Most SVR4 shared libraries define the
2590 variable _timezone and define timezone as a weak synonym. The
2591 tzset call changes _timezone. If you write
2592 extern int timezone;
2594 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2595 you might expect that, since timezone is a synonym for _timezone,
2596 the same number will print both times. However, if the processor
2597 backend uses a COPY reloc, then actually timezone will be copied
2598 into your process image, and, since you define _timezone
2599 yourself, _timezone will not. Thus timezone and _timezone will
2600 wind up at different memory locations. The tzset call will set
2601 _timezone, leaving timezone unchanged. */
2603 if (h
->u
.weakdef
!= NULL
)
2605 /* If we get to this point, we know there is an implicit
2606 reference by a regular object file via the weak symbol H.
2607 FIXME: Is this really true? What if the traversal finds
2608 H->U.WEAKDEF before it finds H? */
2609 h
->u
.weakdef
->ref_regular
= 1;
2611 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2615 /* If a symbol has no type and no size and does not require a PLT
2616 entry, then we are probably about to do the wrong thing here: we
2617 are probably going to create a COPY reloc for an empty object.
2618 This case can arise when a shared object is built with assembly
2619 code, and the assembly code fails to set the symbol type. */
2621 && h
->type
== STT_NOTYPE
2623 (*_bfd_error_handler
)
2624 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2625 h
->root
.root
.string
);
2627 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2628 bed
= get_elf_backend_data (dynobj
);
2629 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2638 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2642 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry
*h
,
2645 unsigned int power_of_two
;
2647 asection
*sec
= h
->root
.u
.def
.section
;
2649 /* The section aligment of definition is the maximum alignment
2650 requirement of symbols defined in the section. Since we don't
2651 know the symbol alignment requirement, we start with the
2652 maximum alignment and check low bits of the symbol address
2653 for the minimum alignment. */
2654 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2655 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2656 while ((h
->root
.u
.def
.value
& mask
) != 0)
2662 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2665 /* Adjust the section alignment if needed. */
2666 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2671 /* We make sure that the symbol will be aligned properly. */
2672 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2674 /* Define the symbol as being at this point in DYNBSS. */
2675 h
->root
.u
.def
.section
= dynbss
;
2676 h
->root
.u
.def
.value
= dynbss
->size
;
2678 /* Increment the size of DYNBSS to make room for the symbol. */
2679 dynbss
->size
+= h
->size
;
2684 /* Adjust all external symbols pointing into SEC_MERGE sections
2685 to reflect the object merging within the sections. */
2688 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2692 if (h
->root
.type
== bfd_link_hash_warning
)
2693 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2695 if ((h
->root
.type
== bfd_link_hash_defined
2696 || h
->root
.type
== bfd_link_hash_defweak
)
2697 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2698 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2700 bfd
*output_bfd
= data
;
2702 h
->root
.u
.def
.value
=
2703 _bfd_merged_section_offset (output_bfd
,
2704 &h
->root
.u
.def
.section
,
2705 elf_section_data (sec
)->sec_info
,
2706 h
->root
.u
.def
.value
);
2712 /* Returns false if the symbol referred to by H should be considered
2713 to resolve local to the current module, and true if it should be
2714 considered to bind dynamically. */
2717 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2718 struct bfd_link_info
*info
,
2719 bfd_boolean ignore_protected
)
2721 bfd_boolean binding_stays_local_p
;
2722 const struct elf_backend_data
*bed
;
2723 struct elf_link_hash_table
*hash_table
;
2728 while (h
->root
.type
== bfd_link_hash_indirect
2729 || h
->root
.type
== bfd_link_hash_warning
)
2730 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2732 /* If it was forced local, then clearly it's not dynamic. */
2733 if (h
->dynindx
== -1)
2735 if (h
->forced_local
)
2738 /* Identify the cases where name binding rules say that a
2739 visible symbol resolves locally. */
2740 binding_stays_local_p
= info
->executable
|| SYMBOLIC_BIND (info
, h
);
2742 switch (ELF_ST_VISIBILITY (h
->other
))
2749 hash_table
= elf_hash_table (info
);
2750 if (!is_elf_hash_table (hash_table
))
2753 bed
= get_elf_backend_data (hash_table
->dynobj
);
2755 /* Proper resolution for function pointer equality may require
2756 that these symbols perhaps be resolved dynamically, even though
2757 we should be resolving them to the current module. */
2758 if (!ignore_protected
|| !bed
->is_function_type (h
->type
))
2759 binding_stays_local_p
= TRUE
;
2766 /* If it isn't defined locally, then clearly it's dynamic. */
2767 if (!h
->def_regular
)
2770 /* Otherwise, the symbol is dynamic if binding rules don't tell
2771 us that it remains local. */
2772 return !binding_stays_local_p
;
2775 /* Return true if the symbol referred to by H should be considered
2776 to resolve local to the current module, and false otherwise. Differs
2777 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2778 undefined symbols and weak symbols. */
2781 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2782 struct bfd_link_info
*info
,
2783 bfd_boolean local_protected
)
2785 const struct elf_backend_data
*bed
;
2786 struct elf_link_hash_table
*hash_table
;
2788 /* If it's a local sym, of course we resolve locally. */
2792 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2793 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
2794 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
2797 /* Common symbols that become definitions don't get the DEF_REGULAR
2798 flag set, so test it first, and don't bail out. */
2799 if (ELF_COMMON_DEF_P (h
))
2801 /* If we don't have a definition in a regular file, then we can't
2802 resolve locally. The sym is either undefined or dynamic. */
2803 else if (!h
->def_regular
)
2806 /* Forced local symbols resolve locally. */
2807 if (h
->forced_local
)
2810 /* As do non-dynamic symbols. */
2811 if (h
->dynindx
== -1)
2814 /* At this point, we know the symbol is defined and dynamic. In an
2815 executable it must resolve locally, likewise when building symbolic
2816 shared libraries. */
2817 if (info
->executable
|| SYMBOLIC_BIND (info
, h
))
2820 /* Now deal with defined dynamic symbols in shared libraries. Ones
2821 with default visibility might not resolve locally. */
2822 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2825 hash_table
= elf_hash_table (info
);
2826 if (!is_elf_hash_table (hash_table
))
2829 bed
= get_elf_backend_data (hash_table
->dynobj
);
2831 /* STV_PROTECTED non-function symbols are local. */
2832 if (!bed
->is_function_type (h
->type
))
2835 /* Function pointer equality tests may require that STV_PROTECTED
2836 symbols be treated as dynamic symbols, even when we know that the
2837 dynamic linker will resolve them locally. */
2838 return local_protected
;
2841 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2842 aligned. Returns the first TLS output section. */
2844 struct bfd_section
*
2845 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2847 struct bfd_section
*sec
, *tls
;
2848 unsigned int align
= 0;
2850 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2851 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2855 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2856 if (sec
->alignment_power
> align
)
2857 align
= sec
->alignment_power
;
2859 elf_hash_table (info
)->tls_sec
= tls
;
2861 /* Ensure the alignment of the first section is the largest alignment,
2862 so that the tls segment starts aligned. */
2864 tls
->alignment_power
= align
;
2869 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2871 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2872 Elf_Internal_Sym
*sym
)
2874 const struct elf_backend_data
*bed
;
2876 /* Local symbols do not count, but target specific ones might. */
2877 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2878 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2881 bed
= get_elf_backend_data (abfd
);
2882 /* Function symbols do not count. */
2883 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
2886 /* If the section is undefined, then so is the symbol. */
2887 if (sym
->st_shndx
== SHN_UNDEF
)
2890 /* If the symbol is defined in the common section, then
2891 it is a common definition and so does not count. */
2892 if (bed
->common_definition (sym
))
2895 /* If the symbol is in a target specific section then we
2896 must rely upon the backend to tell us what it is. */
2897 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2898 /* FIXME - this function is not coded yet:
2900 return _bfd_is_global_symbol_definition (abfd, sym);
2902 Instead for now assume that the definition is not global,
2903 Even if this is wrong, at least the linker will behave
2904 in the same way that it used to do. */
2910 /* Search the symbol table of the archive element of the archive ABFD
2911 whose archive map contains a mention of SYMDEF, and determine if
2912 the symbol is defined in this element. */
2914 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2916 Elf_Internal_Shdr
* hdr
;
2917 bfd_size_type symcount
;
2918 bfd_size_type extsymcount
;
2919 bfd_size_type extsymoff
;
2920 Elf_Internal_Sym
*isymbuf
;
2921 Elf_Internal_Sym
*isym
;
2922 Elf_Internal_Sym
*isymend
;
2925 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2929 if (! bfd_check_format (abfd
, bfd_object
))
2932 /* If we have already included the element containing this symbol in the
2933 link then we do not need to include it again. Just claim that any symbol
2934 it contains is not a definition, so that our caller will not decide to
2935 (re)include this element. */
2936 if (abfd
->archive_pass
)
2939 /* Select the appropriate symbol table. */
2940 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2941 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2943 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2945 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2947 /* The sh_info field of the symtab header tells us where the
2948 external symbols start. We don't care about the local symbols. */
2949 if (elf_bad_symtab (abfd
))
2951 extsymcount
= symcount
;
2956 extsymcount
= symcount
- hdr
->sh_info
;
2957 extsymoff
= hdr
->sh_info
;
2960 if (extsymcount
== 0)
2963 /* Read in the symbol table. */
2964 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
2966 if (isymbuf
== NULL
)
2969 /* Scan the symbol table looking for SYMDEF. */
2971 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
2975 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
2980 if (strcmp (name
, symdef
->name
) == 0)
2982 result
= is_global_data_symbol_definition (abfd
, isym
);
2992 /* Add an entry to the .dynamic table. */
2995 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
2999 struct elf_link_hash_table
*hash_table
;
3000 const struct elf_backend_data
*bed
;
3002 bfd_size_type newsize
;
3003 bfd_byte
*newcontents
;
3004 Elf_Internal_Dyn dyn
;
3006 hash_table
= elf_hash_table (info
);
3007 if (! is_elf_hash_table (hash_table
))
3010 bed
= get_elf_backend_data (hash_table
->dynobj
);
3011 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3012 BFD_ASSERT (s
!= NULL
);
3014 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3015 newcontents
= bfd_realloc (s
->contents
, newsize
);
3016 if (newcontents
== NULL
)
3020 dyn
.d_un
.d_val
= val
;
3021 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3024 s
->contents
= newcontents
;
3029 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3030 otherwise just check whether one already exists. Returns -1 on error,
3031 1 if a DT_NEEDED tag already exists, and 0 on success. */
3034 elf_add_dt_needed_tag (bfd
*abfd
,
3035 struct bfd_link_info
*info
,
3039 struct elf_link_hash_table
*hash_table
;
3040 bfd_size_type oldsize
;
3041 bfd_size_type strindex
;
3043 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3046 hash_table
= elf_hash_table (info
);
3047 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
3048 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3049 if (strindex
== (bfd_size_type
) -1)
3052 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
3055 const struct elf_backend_data
*bed
;
3058 bed
= get_elf_backend_data (hash_table
->dynobj
);
3059 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3061 for (extdyn
= sdyn
->contents
;
3062 extdyn
< sdyn
->contents
+ sdyn
->size
;
3063 extdyn
+= bed
->s
->sizeof_dyn
)
3065 Elf_Internal_Dyn dyn
;
3067 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3068 if (dyn
.d_tag
== DT_NEEDED
3069 && dyn
.d_un
.d_val
== strindex
)
3071 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3079 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3082 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3086 /* We were just checking for existence of the tag. */
3087 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3092 /* Sort symbol by value and section. */
3094 elf_sort_symbol (const void *arg1
, const void *arg2
)
3096 const struct elf_link_hash_entry
*h1
;
3097 const struct elf_link_hash_entry
*h2
;
3098 bfd_signed_vma vdiff
;
3100 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3101 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3102 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3104 return vdiff
> 0 ? 1 : -1;
3107 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3109 return sdiff
> 0 ? 1 : -1;
3114 /* This function is used to adjust offsets into .dynstr for
3115 dynamic symbols. This is called via elf_link_hash_traverse. */
3118 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3120 struct elf_strtab_hash
*dynstr
= data
;
3122 if (h
->root
.type
== bfd_link_hash_warning
)
3123 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3125 if (h
->dynindx
!= -1)
3126 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3130 /* Assign string offsets in .dynstr, update all structures referencing
3134 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3136 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3137 struct elf_link_local_dynamic_entry
*entry
;
3138 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3139 bfd
*dynobj
= hash_table
->dynobj
;
3142 const struct elf_backend_data
*bed
;
3145 _bfd_elf_strtab_finalize (dynstr
);
3146 size
= _bfd_elf_strtab_size (dynstr
);
3148 bed
= get_elf_backend_data (dynobj
);
3149 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3150 BFD_ASSERT (sdyn
!= NULL
);
3152 /* Update all .dynamic entries referencing .dynstr strings. */
3153 for (extdyn
= sdyn
->contents
;
3154 extdyn
< sdyn
->contents
+ sdyn
->size
;
3155 extdyn
+= bed
->s
->sizeof_dyn
)
3157 Elf_Internal_Dyn dyn
;
3159 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3163 dyn
.d_un
.d_val
= size
;
3171 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3176 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3179 /* Now update local dynamic symbols. */
3180 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3181 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3182 entry
->isym
.st_name
);
3184 /* And the rest of dynamic symbols. */
3185 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3187 /* Adjust version definitions. */
3188 if (elf_tdata (output_bfd
)->cverdefs
)
3193 Elf_Internal_Verdef def
;
3194 Elf_Internal_Verdaux defaux
;
3196 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3200 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3202 p
+= sizeof (Elf_External_Verdef
);
3203 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3205 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3207 _bfd_elf_swap_verdaux_in (output_bfd
,
3208 (Elf_External_Verdaux
*) p
, &defaux
);
3209 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3211 _bfd_elf_swap_verdaux_out (output_bfd
,
3212 &defaux
, (Elf_External_Verdaux
*) p
);
3213 p
+= sizeof (Elf_External_Verdaux
);
3216 while (def
.vd_next
);
3219 /* Adjust version references. */
3220 if (elf_tdata (output_bfd
)->verref
)
3225 Elf_Internal_Verneed need
;
3226 Elf_Internal_Vernaux needaux
;
3228 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3232 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3234 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3235 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3236 (Elf_External_Verneed
*) p
);
3237 p
+= sizeof (Elf_External_Verneed
);
3238 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3240 _bfd_elf_swap_vernaux_in (output_bfd
,
3241 (Elf_External_Vernaux
*) p
, &needaux
);
3242 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3244 _bfd_elf_swap_vernaux_out (output_bfd
,
3246 (Elf_External_Vernaux
*) p
);
3247 p
+= sizeof (Elf_External_Vernaux
);
3250 while (need
.vn_next
);
3256 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3257 The default is to only match when the INPUT and OUTPUT are exactly
3261 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3262 const bfd_target
*output
)
3264 return input
== output
;
3267 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3268 This version is used when different targets for the same architecture
3269 are virtually identical. */
3272 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3273 const bfd_target
*output
)
3275 const struct elf_backend_data
*obed
, *ibed
;
3277 if (input
== output
)
3280 ibed
= xvec_get_elf_backend_data (input
);
3281 obed
= xvec_get_elf_backend_data (output
);
3283 if (ibed
->arch
!= obed
->arch
)
3286 /* If both backends are using this function, deem them compatible. */
3287 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3290 /* Add symbols from an ELF object file to the linker hash table. */
3293 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3295 Elf_Internal_Shdr
*hdr
;
3296 bfd_size_type symcount
;
3297 bfd_size_type extsymcount
;
3298 bfd_size_type extsymoff
;
3299 struct elf_link_hash_entry
**sym_hash
;
3300 bfd_boolean dynamic
;
3301 Elf_External_Versym
*extversym
= NULL
;
3302 Elf_External_Versym
*ever
;
3303 struct elf_link_hash_entry
*weaks
;
3304 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3305 bfd_size_type nondeflt_vers_cnt
= 0;
3306 Elf_Internal_Sym
*isymbuf
= NULL
;
3307 Elf_Internal_Sym
*isym
;
3308 Elf_Internal_Sym
*isymend
;
3309 const struct elf_backend_data
*bed
;
3310 bfd_boolean add_needed
;
3311 struct elf_link_hash_table
*htab
;
3313 void *alloc_mark
= NULL
;
3314 struct bfd_hash_entry
**old_table
= NULL
;
3315 unsigned int old_size
= 0;
3316 unsigned int old_count
= 0;
3317 void *old_tab
= NULL
;
3320 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3321 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3322 long old_dynsymcount
= 0;
3324 size_t hashsize
= 0;
3326 htab
= elf_hash_table (info
);
3327 bed
= get_elf_backend_data (abfd
);
3329 if ((abfd
->flags
& DYNAMIC
) == 0)
3335 /* You can't use -r against a dynamic object. Also, there's no
3336 hope of using a dynamic object which does not exactly match
3337 the format of the output file. */
3338 if (info
->relocatable
3339 || !is_elf_hash_table (htab
)
3340 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3342 if (info
->relocatable
)
3343 bfd_set_error (bfd_error_invalid_operation
);
3345 bfd_set_error (bfd_error_wrong_format
);
3350 /* As a GNU extension, any input sections which are named
3351 .gnu.warning.SYMBOL are treated as warning symbols for the given
3352 symbol. This differs from .gnu.warning sections, which generate
3353 warnings when they are included in an output file. */
3354 if (info
->executable
)
3358 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3362 name
= bfd_get_section_name (abfd
, s
);
3363 if (CONST_STRNEQ (name
, ".gnu.warning."))
3368 name
+= sizeof ".gnu.warning." - 1;
3370 /* If this is a shared object, then look up the symbol
3371 in the hash table. If it is there, and it is already
3372 been defined, then we will not be using the entry
3373 from this shared object, so we don't need to warn.
3374 FIXME: If we see the definition in a regular object
3375 later on, we will warn, but we shouldn't. The only
3376 fix is to keep track of what warnings we are supposed
3377 to emit, and then handle them all at the end of the
3381 struct elf_link_hash_entry
*h
;
3383 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3385 /* FIXME: What about bfd_link_hash_common? */
3387 && (h
->root
.type
== bfd_link_hash_defined
3388 || h
->root
.type
== bfd_link_hash_defweak
))
3390 /* We don't want to issue this warning. Clobber
3391 the section size so that the warning does not
3392 get copied into the output file. */
3399 msg
= bfd_alloc (abfd
, sz
+ 1);
3403 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3408 if (! (_bfd_generic_link_add_one_symbol
3409 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3410 FALSE
, bed
->collect
, NULL
)))
3413 if (! info
->relocatable
)
3415 /* Clobber the section size so that the warning does
3416 not get copied into the output file. */
3419 /* Also set SEC_EXCLUDE, so that symbols defined in
3420 the warning section don't get copied to the output. */
3421 s
->flags
|= SEC_EXCLUDE
;
3430 /* If we are creating a shared library, create all the dynamic
3431 sections immediately. We need to attach them to something,
3432 so we attach them to this BFD, provided it is the right
3433 format. FIXME: If there are no input BFD's of the same
3434 format as the output, we can't make a shared library. */
3436 && is_elf_hash_table (htab
)
3437 && info
->output_bfd
->xvec
== abfd
->xvec
3438 && !htab
->dynamic_sections_created
)
3440 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3444 else if (!is_elf_hash_table (htab
))
3449 const char *soname
= NULL
;
3450 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3453 /* ld --just-symbols and dynamic objects don't mix very well.
3454 ld shouldn't allow it. */
3455 if ((s
= abfd
->sections
) != NULL
3456 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3459 /* If this dynamic lib was specified on the command line with
3460 --as-needed in effect, then we don't want to add a DT_NEEDED
3461 tag unless the lib is actually used. Similary for libs brought
3462 in by another lib's DT_NEEDED. When --no-add-needed is used
3463 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3464 any dynamic library in DT_NEEDED tags in the dynamic lib at
3466 add_needed
= (elf_dyn_lib_class (abfd
)
3467 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3468 | DYN_NO_NEEDED
)) == 0;
3470 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3475 unsigned int elfsec
;
3476 unsigned long shlink
;
3478 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3479 goto error_free_dyn
;
3481 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3482 if (elfsec
== SHN_BAD
)
3483 goto error_free_dyn
;
3484 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3486 for (extdyn
= dynbuf
;
3487 extdyn
< dynbuf
+ s
->size
;
3488 extdyn
+= bed
->s
->sizeof_dyn
)
3490 Elf_Internal_Dyn dyn
;
3492 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3493 if (dyn
.d_tag
== DT_SONAME
)
3495 unsigned int tagv
= dyn
.d_un
.d_val
;
3496 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3498 goto error_free_dyn
;
3500 if (dyn
.d_tag
== DT_NEEDED
)
3502 struct bfd_link_needed_list
*n
, **pn
;
3504 unsigned int tagv
= dyn
.d_un
.d_val
;
3506 amt
= sizeof (struct bfd_link_needed_list
);
3507 n
= bfd_alloc (abfd
, amt
);
3508 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3509 if (n
== NULL
|| fnm
== NULL
)
3510 goto error_free_dyn
;
3511 amt
= strlen (fnm
) + 1;
3512 anm
= bfd_alloc (abfd
, amt
);
3514 goto error_free_dyn
;
3515 memcpy (anm
, fnm
, amt
);
3519 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3523 if (dyn
.d_tag
== DT_RUNPATH
)
3525 struct bfd_link_needed_list
*n
, **pn
;
3527 unsigned int tagv
= dyn
.d_un
.d_val
;
3529 amt
= sizeof (struct bfd_link_needed_list
);
3530 n
= bfd_alloc (abfd
, amt
);
3531 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3532 if (n
== NULL
|| fnm
== NULL
)
3533 goto error_free_dyn
;
3534 amt
= strlen (fnm
) + 1;
3535 anm
= bfd_alloc (abfd
, amt
);
3537 goto error_free_dyn
;
3538 memcpy (anm
, fnm
, amt
);
3542 for (pn
= & runpath
;
3548 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3549 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3551 struct bfd_link_needed_list
*n
, **pn
;
3553 unsigned int tagv
= dyn
.d_un
.d_val
;
3555 amt
= sizeof (struct bfd_link_needed_list
);
3556 n
= bfd_alloc (abfd
, amt
);
3557 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3558 if (n
== NULL
|| fnm
== NULL
)
3559 goto error_free_dyn
;
3560 amt
= strlen (fnm
) + 1;
3561 anm
= bfd_alloc (abfd
, amt
);
3568 memcpy (anm
, fnm
, amt
);
3583 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3584 frees all more recently bfd_alloc'd blocks as well. */
3590 struct bfd_link_needed_list
**pn
;
3591 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3596 /* We do not want to include any of the sections in a dynamic
3597 object in the output file. We hack by simply clobbering the
3598 list of sections in the BFD. This could be handled more
3599 cleanly by, say, a new section flag; the existing
3600 SEC_NEVER_LOAD flag is not the one we want, because that one
3601 still implies that the section takes up space in the output
3603 bfd_section_list_clear (abfd
);
3605 /* Find the name to use in a DT_NEEDED entry that refers to this
3606 object. If the object has a DT_SONAME entry, we use it.
3607 Otherwise, if the generic linker stuck something in
3608 elf_dt_name, we use that. Otherwise, we just use the file
3610 if (soname
== NULL
|| *soname
== '\0')
3612 soname
= elf_dt_name (abfd
);
3613 if (soname
== NULL
|| *soname
== '\0')
3614 soname
= bfd_get_filename (abfd
);
3617 /* Save the SONAME because sometimes the linker emulation code
3618 will need to know it. */
3619 elf_dt_name (abfd
) = soname
;
3621 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3625 /* If we have already included this dynamic object in the
3626 link, just ignore it. There is no reason to include a
3627 particular dynamic object more than once. */
3632 /* If this is a dynamic object, we always link against the .dynsym
3633 symbol table, not the .symtab symbol table. The dynamic linker
3634 will only see the .dynsym symbol table, so there is no reason to
3635 look at .symtab for a dynamic object. */
3637 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3638 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3640 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3642 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3644 /* The sh_info field of the symtab header tells us where the
3645 external symbols start. We don't care about the local symbols at
3647 if (elf_bad_symtab (abfd
))
3649 extsymcount
= symcount
;
3654 extsymcount
= symcount
- hdr
->sh_info
;
3655 extsymoff
= hdr
->sh_info
;
3659 if (extsymcount
!= 0)
3661 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3663 if (isymbuf
== NULL
)
3666 /* We store a pointer to the hash table entry for each external
3668 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3669 sym_hash
= bfd_alloc (abfd
, amt
);
3670 if (sym_hash
== NULL
)
3671 goto error_free_sym
;
3672 elf_sym_hashes (abfd
) = sym_hash
;
3677 /* Read in any version definitions. */
3678 if (!_bfd_elf_slurp_version_tables (abfd
,
3679 info
->default_imported_symver
))
3680 goto error_free_sym
;
3682 /* Read in the symbol versions, but don't bother to convert them
3683 to internal format. */
3684 if (elf_dynversym (abfd
) != 0)
3686 Elf_Internal_Shdr
*versymhdr
;
3688 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3689 extversym
= bfd_malloc (versymhdr
->sh_size
);
3690 if (extversym
== NULL
)
3691 goto error_free_sym
;
3692 amt
= versymhdr
->sh_size
;
3693 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3694 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3695 goto error_free_vers
;
3699 /* If we are loading an as-needed shared lib, save the symbol table
3700 state before we start adding symbols. If the lib turns out
3701 to be unneeded, restore the state. */
3702 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
3707 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
3709 struct bfd_hash_entry
*p
;
3710 struct elf_link_hash_entry
*h
;
3712 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3714 h
= (struct elf_link_hash_entry
*) p
;
3715 entsize
+= htab
->root
.table
.entsize
;
3716 if (h
->root
.type
== bfd_link_hash_warning
)
3717 entsize
+= htab
->root
.table
.entsize
;
3721 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
3722 hashsize
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3723 old_tab
= bfd_malloc (tabsize
+ entsize
+ hashsize
);
3724 if (old_tab
== NULL
)
3725 goto error_free_vers
;
3727 /* Remember the current objalloc pointer, so that all mem for
3728 symbols added can later be reclaimed. */
3729 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
3730 if (alloc_mark
== NULL
)
3731 goto error_free_vers
;
3733 /* Make a special call to the linker "notice" function to
3734 tell it that we are about to handle an as-needed lib. */
3735 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
3737 goto error_free_vers
;
3739 /* Clone the symbol table and sym hashes. Remember some
3740 pointers into the symbol table, and dynamic symbol count. */
3741 old_hash
= (char *) old_tab
+ tabsize
;
3742 old_ent
= (char *) old_hash
+ hashsize
;
3743 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
3744 memcpy (old_hash
, sym_hash
, hashsize
);
3745 old_undefs
= htab
->root
.undefs
;
3746 old_undefs_tail
= htab
->root
.undefs_tail
;
3747 old_table
= htab
->root
.table
.table
;
3748 old_size
= htab
->root
.table
.size
;
3749 old_count
= htab
->root
.table
.count
;
3750 old_dynsymcount
= htab
->dynsymcount
;
3752 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
3754 struct bfd_hash_entry
*p
;
3755 struct elf_link_hash_entry
*h
;
3757 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3759 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
3760 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3761 h
= (struct elf_link_hash_entry
*) p
;
3762 if (h
->root
.type
== bfd_link_hash_warning
)
3764 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
3765 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3772 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3773 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3775 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3779 asection
*sec
, *new_sec
;
3782 struct elf_link_hash_entry
*h
;
3783 bfd_boolean definition
;
3784 bfd_boolean size_change_ok
;
3785 bfd_boolean type_change_ok
;
3786 bfd_boolean new_weakdef
;
3787 bfd_boolean override
;
3789 unsigned int old_alignment
;
3794 flags
= BSF_NO_FLAGS
;
3796 value
= isym
->st_value
;
3798 common
= bed
->common_definition (isym
);
3800 bind
= ELF_ST_BIND (isym
->st_info
);
3801 if (bind
== STB_LOCAL
)
3803 /* This should be impossible, since ELF requires that all
3804 global symbols follow all local symbols, and that sh_info
3805 point to the first global symbol. Unfortunately, Irix 5
3809 else if (bind
== STB_GLOBAL
)
3811 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
3814 else if (bind
== STB_WEAK
)
3818 /* Leave it up to the processor backend. */
3821 if (isym
->st_shndx
== SHN_UNDEF
)
3822 sec
= bfd_und_section_ptr
;
3823 else if (isym
->st_shndx
== SHN_ABS
)
3824 sec
= bfd_abs_section_ptr
;
3825 else if (isym
->st_shndx
== SHN_COMMON
)
3827 sec
= bfd_com_section_ptr
;
3828 /* What ELF calls the size we call the value. What ELF
3829 calls the value we call the alignment. */
3830 value
= isym
->st_size
;
3834 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3836 sec
= bfd_abs_section_ptr
;
3837 else if (sec
->kept_section
)
3839 /* Symbols from discarded section are undefined. We keep
3841 sec
= bfd_und_section_ptr
;
3842 isym
->st_shndx
= SHN_UNDEF
;
3844 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3848 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3851 goto error_free_vers
;
3853 if (isym
->st_shndx
== SHN_COMMON
3854 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
3855 && !info
->relocatable
)
3857 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3861 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon",
3864 | SEC_LINKER_CREATED
3865 | SEC_THREAD_LOCAL
));
3867 goto error_free_vers
;
3871 else if (bed
->elf_add_symbol_hook
)
3873 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
3875 goto error_free_vers
;
3877 /* The hook function sets the name to NULL if this symbol
3878 should be skipped for some reason. */
3883 /* Sanity check that all possibilities were handled. */
3886 bfd_set_error (bfd_error_bad_value
);
3887 goto error_free_vers
;
3890 if (bfd_is_und_section (sec
)
3891 || bfd_is_com_section (sec
))
3896 size_change_ok
= FALSE
;
3897 type_change_ok
= bed
->type_change_ok
;
3902 if (is_elf_hash_table (htab
))
3904 Elf_Internal_Versym iver
;
3905 unsigned int vernum
= 0;
3910 if (info
->default_imported_symver
)
3911 /* Use the default symbol version created earlier. */
3912 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
3917 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
3919 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
3921 /* If this is a hidden symbol, or if it is not version
3922 1, we append the version name to the symbol name.
3923 However, we do not modify a non-hidden absolute symbol
3924 if it is not a function, because it might be the version
3925 symbol itself. FIXME: What if it isn't? */
3926 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
3928 && (!bfd_is_abs_section (sec
)
3929 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
3932 size_t namelen
, verlen
, newlen
;
3935 if (isym
->st_shndx
!= SHN_UNDEF
)
3937 if (vernum
> elf_tdata (abfd
)->cverdefs
)
3939 else if (vernum
> 1)
3941 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
3947 (*_bfd_error_handler
)
3948 (_("%B: %s: invalid version %u (max %d)"),
3950 elf_tdata (abfd
)->cverdefs
);
3951 bfd_set_error (bfd_error_bad_value
);
3952 goto error_free_vers
;
3957 /* We cannot simply test for the number of
3958 entries in the VERNEED section since the
3959 numbers for the needed versions do not start
3961 Elf_Internal_Verneed
*t
;
3964 for (t
= elf_tdata (abfd
)->verref
;
3968 Elf_Internal_Vernaux
*a
;
3970 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3972 if (a
->vna_other
== vernum
)
3974 verstr
= a
->vna_nodename
;
3983 (*_bfd_error_handler
)
3984 (_("%B: %s: invalid needed version %d"),
3985 abfd
, name
, vernum
);
3986 bfd_set_error (bfd_error_bad_value
);
3987 goto error_free_vers
;
3991 namelen
= strlen (name
);
3992 verlen
= strlen (verstr
);
3993 newlen
= namelen
+ verlen
+ 2;
3994 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3995 && isym
->st_shndx
!= SHN_UNDEF
)
3998 newname
= bfd_hash_allocate (&htab
->root
.table
, newlen
);
3999 if (newname
== NULL
)
4000 goto error_free_vers
;
4001 memcpy (newname
, name
, namelen
);
4002 p
= newname
+ namelen
;
4004 /* If this is a defined non-hidden version symbol,
4005 we add another @ to the name. This indicates the
4006 default version of the symbol. */
4007 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4008 && isym
->st_shndx
!= SHN_UNDEF
)
4010 memcpy (p
, verstr
, verlen
+ 1);
4015 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
,
4016 &value
, &old_alignment
,
4017 sym_hash
, &skip
, &override
,
4018 &type_change_ok
, &size_change_ok
))
4019 goto error_free_vers
;
4028 while (h
->root
.type
== bfd_link_hash_indirect
4029 || h
->root
.type
== bfd_link_hash_warning
)
4030 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4032 /* Remember the old alignment if this is a common symbol, so
4033 that we don't reduce the alignment later on. We can't
4034 check later, because _bfd_generic_link_add_one_symbol
4035 will set a default for the alignment which we want to
4036 override. We also remember the old bfd where the existing
4037 definition comes from. */
4038 switch (h
->root
.type
)
4043 case bfd_link_hash_defined
:
4044 case bfd_link_hash_defweak
:
4045 old_bfd
= h
->root
.u
.def
.section
->owner
;
4048 case bfd_link_hash_common
:
4049 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
4050 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
4054 if (elf_tdata (abfd
)->verdef
!= NULL
4058 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4061 if (! (_bfd_generic_link_add_one_symbol
4062 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4063 (struct bfd_link_hash_entry
**) sym_hash
)))
4064 goto error_free_vers
;
4067 while (h
->root
.type
== bfd_link_hash_indirect
4068 || h
->root
.type
== bfd_link_hash_warning
)
4069 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4072 new_weakdef
= FALSE
;
4075 && (flags
& BSF_WEAK
) != 0
4076 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4077 && is_elf_hash_table (htab
)
4078 && h
->u
.weakdef
== NULL
)
4080 /* Keep a list of all weak defined non function symbols from
4081 a dynamic object, using the weakdef field. Later in this
4082 function we will set the weakdef field to the correct
4083 value. We only put non-function symbols from dynamic
4084 objects on this list, because that happens to be the only
4085 time we need to know the normal symbol corresponding to a
4086 weak symbol, and the information is time consuming to
4087 figure out. If the weakdef field is not already NULL,
4088 then this symbol was already defined by some previous
4089 dynamic object, and we will be using that previous
4090 definition anyhow. */
4092 h
->u
.weakdef
= weaks
;
4097 /* Set the alignment of a common symbol. */
4098 if ((common
|| bfd_is_com_section (sec
))
4099 && h
->root
.type
== bfd_link_hash_common
)
4104 align
= bfd_log2 (isym
->st_value
);
4107 /* The new symbol is a common symbol in a shared object.
4108 We need to get the alignment from the section. */
4109 align
= new_sec
->alignment_power
;
4111 if (align
> old_alignment
4112 /* Permit an alignment power of zero if an alignment of one
4113 is specified and no other alignments have been specified. */
4114 || (isym
->st_value
== 1 && old_alignment
== 0))
4115 h
->root
.u
.c
.p
->alignment_power
= align
;
4117 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4120 if (is_elf_hash_table (htab
))
4124 /* Check the alignment when a common symbol is involved. This
4125 can change when a common symbol is overridden by a normal
4126 definition or a common symbol is ignored due to the old
4127 normal definition. We need to make sure the maximum
4128 alignment is maintained. */
4129 if ((old_alignment
|| common
)
4130 && h
->root
.type
!= bfd_link_hash_common
)
4132 unsigned int common_align
;
4133 unsigned int normal_align
;
4134 unsigned int symbol_align
;
4138 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4139 if (h
->root
.u
.def
.section
->owner
!= NULL
4140 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
4142 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4143 if (normal_align
> symbol_align
)
4144 normal_align
= symbol_align
;
4147 normal_align
= symbol_align
;
4151 common_align
= old_alignment
;
4152 common_bfd
= old_bfd
;
4157 common_align
= bfd_log2 (isym
->st_value
);
4159 normal_bfd
= old_bfd
;
4162 if (normal_align
< common_align
)
4164 /* PR binutils/2735 */
4165 if (normal_bfd
== NULL
)
4166 (*_bfd_error_handler
)
4167 (_("Warning: alignment %u of common symbol `%s' in %B"
4168 " is greater than the alignment (%u) of its section %A"),
4169 common_bfd
, h
->root
.u
.def
.section
,
4170 1 << common_align
, name
, 1 << normal_align
);
4172 (*_bfd_error_handler
)
4173 (_("Warning: alignment %u of symbol `%s' in %B"
4174 " is smaller than %u in %B"),
4175 normal_bfd
, common_bfd
,
4176 1 << normal_align
, name
, 1 << common_align
);
4180 /* Remember the symbol size if it isn't undefined. */
4181 if ((isym
->st_size
!= 0 && isym
->st_shndx
!= SHN_UNDEF
)
4182 && (definition
|| h
->size
== 0))
4185 && h
->size
!= isym
->st_size
4186 && ! size_change_ok
)
4187 (*_bfd_error_handler
)
4188 (_("Warning: size of symbol `%s' changed"
4189 " from %lu in %B to %lu in %B"),
4191 name
, (unsigned long) h
->size
,
4192 (unsigned long) isym
->st_size
);
4194 h
->size
= isym
->st_size
;
4197 /* If this is a common symbol, then we always want H->SIZE
4198 to be the size of the common symbol. The code just above
4199 won't fix the size if a common symbol becomes larger. We
4200 don't warn about a size change here, because that is
4201 covered by --warn-common. Allow changed between different
4203 if (h
->root
.type
== bfd_link_hash_common
)
4204 h
->size
= h
->root
.u
.c
.size
;
4206 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4207 && (definition
|| h
->type
== STT_NOTYPE
))
4209 if (h
->type
!= STT_NOTYPE
4210 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
4211 && ! type_change_ok
)
4212 (*_bfd_error_handler
)
4213 (_("Warning: type of symbol `%s' changed"
4214 " from %d to %d in %B"),
4215 abfd
, name
, h
->type
, ELF_ST_TYPE (isym
->st_info
));
4217 h
->type
= ELF_ST_TYPE (isym
->st_info
);
4220 /* If st_other has a processor-specific meaning, specific
4221 code might be needed here. We never merge the visibility
4222 attribute with the one from a dynamic object. */
4223 if (bed
->elf_backend_merge_symbol_attribute
)
4224 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
4227 /* If this symbol has default visibility and the user has requested
4228 we not re-export it, then mark it as hidden. */
4229 if (definition
&& !dynamic
4231 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
4232 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4233 isym
->st_other
= (STV_HIDDEN
4234 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4236 if (ELF_ST_VISIBILITY (isym
->st_other
) != 0 && !dynamic
)
4238 unsigned char hvis
, symvis
, other
, nvis
;
4240 /* Only merge the visibility. Leave the remainder of the
4241 st_other field to elf_backend_merge_symbol_attribute. */
4242 other
= h
->other
& ~ELF_ST_VISIBILITY (-1);
4244 /* Combine visibilities, using the most constraining one. */
4245 hvis
= ELF_ST_VISIBILITY (h
->other
);
4246 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
4252 nvis
= hvis
< symvis
? hvis
: symvis
;
4254 h
->other
= other
| nvis
;
4257 /* Set a flag in the hash table entry indicating the type of
4258 reference or definition we just found. Keep a count of
4259 the number of dynamic symbols we find. A dynamic symbol
4260 is one which is referenced or defined by both a regular
4261 object and a shared object. */
4268 if (bind
!= STB_WEAK
)
4269 h
->ref_regular_nonweak
= 1;
4273 if (! info
->executable
4286 || (h
->u
.weakdef
!= NULL
4288 && h
->u
.weakdef
->dynindx
!= -1))
4292 if (definition
&& (sec
->flags
& SEC_DEBUGGING
))
4294 /* We don't want to make debug symbol dynamic. */
4295 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4299 /* Check to see if we need to add an indirect symbol for
4300 the default name. */
4301 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
4302 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4303 &sec
, &value
, &dynsym
,
4305 goto error_free_vers
;
4307 if (definition
&& !dynamic
)
4309 char *p
= strchr (name
, ELF_VER_CHR
);
4310 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4312 /* Queue non-default versions so that .symver x, x@FOO
4313 aliases can be checked. */
4316 amt
= ((isymend
- isym
+ 1)
4317 * sizeof (struct elf_link_hash_entry
*));
4318 nondeflt_vers
= bfd_malloc (amt
);
4320 goto error_free_vers
;
4322 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4326 if (dynsym
&& h
->dynindx
== -1)
4328 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4329 goto error_free_vers
;
4330 if (h
->u
.weakdef
!= NULL
4332 && h
->u
.weakdef
->dynindx
== -1)
4334 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4335 goto error_free_vers
;
4338 else if (dynsym
&& h
->dynindx
!= -1)
4339 /* If the symbol already has a dynamic index, but
4340 visibility says it should not be visible, turn it into
4342 switch (ELF_ST_VISIBILITY (h
->other
))
4346 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4357 const char *soname
= elf_dt_name (abfd
);
4359 /* A symbol from a library loaded via DT_NEEDED of some
4360 other library is referenced by a regular object.
4361 Add a DT_NEEDED entry for it. Issue an error if
4362 --no-add-needed is used. */
4363 if ((elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4365 (*_bfd_error_handler
)
4366 (_("%s: invalid DSO for symbol `%s' definition"),
4368 bfd_set_error (bfd_error_bad_value
);
4369 goto error_free_vers
;
4372 elf_dyn_lib_class (abfd
) &= ~DYN_AS_NEEDED
;
4375 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4377 goto error_free_vers
;
4379 BFD_ASSERT (ret
== 0);
4384 if (extversym
!= NULL
)
4390 if (isymbuf
!= NULL
)
4396 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4400 /* Restore the symbol table. */
4401 if (bed
->as_needed_cleanup
)
4402 (*bed
->as_needed_cleanup
) (abfd
, info
);
4403 old_hash
= (char *) old_tab
+ tabsize
;
4404 old_ent
= (char *) old_hash
+ hashsize
;
4405 sym_hash
= elf_sym_hashes (abfd
);
4406 htab
->root
.table
.table
= old_table
;
4407 htab
->root
.table
.size
= old_size
;
4408 htab
->root
.table
.count
= old_count
;
4409 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4410 memcpy (sym_hash
, old_hash
, hashsize
);
4411 htab
->root
.undefs
= old_undefs
;
4412 htab
->root
.undefs_tail
= old_undefs_tail
;
4413 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4415 struct bfd_hash_entry
*p
;
4416 struct elf_link_hash_entry
*h
;
4418 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4420 h
= (struct elf_link_hash_entry
*) p
;
4421 if (h
->root
.type
== bfd_link_hash_warning
)
4422 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4423 if (h
->dynindx
>= old_dynsymcount
)
4424 _bfd_elf_strtab_delref (htab
->dynstr
, h
->dynstr_index
);
4426 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4427 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4428 h
= (struct elf_link_hash_entry
*) p
;
4429 if (h
->root
.type
== bfd_link_hash_warning
)
4431 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4432 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4437 /* Make a special call to the linker "notice" function to
4438 tell it that symbols added for crefs may need to be removed. */
4439 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4441 goto error_free_vers
;
4444 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4446 if (nondeflt_vers
!= NULL
)
4447 free (nondeflt_vers
);
4451 if (old_tab
!= NULL
)
4453 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4455 goto error_free_vers
;
4460 /* Now that all the symbols from this input file are created, handle
4461 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4462 if (nondeflt_vers
!= NULL
)
4464 bfd_size_type cnt
, symidx
;
4466 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4468 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4469 char *shortname
, *p
;
4471 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4473 || (h
->root
.type
!= bfd_link_hash_defined
4474 && h
->root
.type
!= bfd_link_hash_defweak
))
4477 amt
= p
- h
->root
.root
.string
;
4478 shortname
= bfd_malloc (amt
+ 1);
4480 goto error_free_vers
;
4481 memcpy (shortname
, h
->root
.root
.string
, amt
);
4482 shortname
[amt
] = '\0';
4484 hi
= (struct elf_link_hash_entry
*)
4485 bfd_link_hash_lookup (&htab
->root
, shortname
,
4486 FALSE
, FALSE
, FALSE
);
4488 && hi
->root
.type
== h
->root
.type
4489 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4490 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4492 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4493 hi
->root
.type
= bfd_link_hash_indirect
;
4494 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4495 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4496 sym_hash
= elf_sym_hashes (abfd
);
4498 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4499 if (sym_hash
[symidx
] == hi
)
4501 sym_hash
[symidx
] = h
;
4507 free (nondeflt_vers
);
4508 nondeflt_vers
= NULL
;
4511 /* Now set the weakdefs field correctly for all the weak defined
4512 symbols we found. The only way to do this is to search all the
4513 symbols. Since we only need the information for non functions in
4514 dynamic objects, that's the only time we actually put anything on
4515 the list WEAKS. We need this information so that if a regular
4516 object refers to a symbol defined weakly in a dynamic object, the
4517 real symbol in the dynamic object is also put in the dynamic
4518 symbols; we also must arrange for both symbols to point to the
4519 same memory location. We could handle the general case of symbol
4520 aliasing, but a general symbol alias can only be generated in
4521 assembler code, handling it correctly would be very time
4522 consuming, and other ELF linkers don't handle general aliasing
4526 struct elf_link_hash_entry
**hpp
;
4527 struct elf_link_hash_entry
**hppend
;
4528 struct elf_link_hash_entry
**sorted_sym_hash
;
4529 struct elf_link_hash_entry
*h
;
4532 /* Since we have to search the whole symbol list for each weak
4533 defined symbol, search time for N weak defined symbols will be
4534 O(N^2). Binary search will cut it down to O(NlogN). */
4535 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4536 sorted_sym_hash
= bfd_malloc (amt
);
4537 if (sorted_sym_hash
== NULL
)
4539 sym_hash
= sorted_sym_hash
;
4540 hpp
= elf_sym_hashes (abfd
);
4541 hppend
= hpp
+ extsymcount
;
4543 for (; hpp
< hppend
; hpp
++)
4547 && h
->root
.type
== bfd_link_hash_defined
4548 && !bed
->is_function_type (h
->type
))
4556 qsort (sorted_sym_hash
, sym_count
,
4557 sizeof (struct elf_link_hash_entry
*),
4560 while (weaks
!= NULL
)
4562 struct elf_link_hash_entry
*hlook
;
4569 weaks
= hlook
->u
.weakdef
;
4570 hlook
->u
.weakdef
= NULL
;
4572 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4573 || hlook
->root
.type
== bfd_link_hash_defweak
4574 || hlook
->root
.type
== bfd_link_hash_common
4575 || hlook
->root
.type
== bfd_link_hash_indirect
);
4576 slook
= hlook
->root
.u
.def
.section
;
4577 vlook
= hlook
->root
.u
.def
.value
;
4584 bfd_signed_vma vdiff
;
4586 h
= sorted_sym_hash
[idx
];
4587 vdiff
= vlook
- h
->root
.u
.def
.value
;
4594 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4607 /* We didn't find a value/section match. */
4611 for (i
= ilook
; i
< sym_count
; i
++)
4613 h
= sorted_sym_hash
[i
];
4615 /* Stop if value or section doesn't match. */
4616 if (h
->root
.u
.def
.value
!= vlook
4617 || h
->root
.u
.def
.section
!= slook
)
4619 else if (h
!= hlook
)
4621 hlook
->u
.weakdef
= h
;
4623 /* If the weak definition is in the list of dynamic
4624 symbols, make sure the real definition is put
4626 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4628 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4632 /* If the real definition is in the list of dynamic
4633 symbols, make sure the weak definition is put
4634 there as well. If we don't do this, then the
4635 dynamic loader might not merge the entries for the
4636 real definition and the weak definition. */
4637 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4639 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4647 free (sorted_sym_hash
);
4650 if (bed
->check_directives
)
4651 (*bed
->check_directives
) (abfd
, info
);
4653 /* If this object is the same format as the output object, and it is
4654 not a shared library, then let the backend look through the
4657 This is required to build global offset table entries and to
4658 arrange for dynamic relocs. It is not required for the
4659 particular common case of linking non PIC code, even when linking
4660 against shared libraries, but unfortunately there is no way of
4661 knowing whether an object file has been compiled PIC or not.
4662 Looking through the relocs is not particularly time consuming.
4663 The problem is that we must either (1) keep the relocs in memory,
4664 which causes the linker to require additional runtime memory or
4665 (2) read the relocs twice from the input file, which wastes time.
4666 This would be a good case for using mmap.
4668 I have no idea how to handle linking PIC code into a file of a
4669 different format. It probably can't be done. */
4671 && is_elf_hash_table (htab
)
4672 && bed
->check_relocs
!= NULL
4673 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4677 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4679 Elf_Internal_Rela
*internal_relocs
;
4682 if ((o
->flags
& SEC_RELOC
) == 0
4683 || o
->reloc_count
== 0
4684 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4685 && (o
->flags
& SEC_DEBUGGING
) != 0)
4686 || bfd_is_abs_section (o
->output_section
))
4689 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4691 if (internal_relocs
== NULL
)
4694 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4696 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4697 free (internal_relocs
);
4704 /* If this is a non-traditional link, try to optimize the handling
4705 of the .stab/.stabstr sections. */
4707 && ! info
->traditional_format
4708 && is_elf_hash_table (htab
)
4709 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4713 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4714 if (stabstr
!= NULL
)
4716 bfd_size_type string_offset
= 0;
4719 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4720 if (CONST_STRNEQ (stab
->name
, ".stab")
4721 && (!stab
->name
[5] ||
4722 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4723 && (stab
->flags
& SEC_MERGE
) == 0
4724 && !bfd_is_abs_section (stab
->output_section
))
4726 struct bfd_elf_section_data
*secdata
;
4728 secdata
= elf_section_data (stab
);
4729 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
4730 stabstr
, &secdata
->sec_info
,
4733 if (secdata
->sec_info
)
4734 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4739 if (is_elf_hash_table (htab
) && add_needed
)
4741 /* Add this bfd to the loaded list. */
4742 struct elf_link_loaded_list
*n
;
4744 n
= bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4748 n
->next
= htab
->loaded
;
4755 if (old_tab
!= NULL
)
4757 if (nondeflt_vers
!= NULL
)
4758 free (nondeflt_vers
);
4759 if (extversym
!= NULL
)
4762 if (isymbuf
!= NULL
)
4768 /* Return the linker hash table entry of a symbol that might be
4769 satisfied by an archive symbol. Return -1 on error. */
4771 struct elf_link_hash_entry
*
4772 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4773 struct bfd_link_info
*info
,
4776 struct elf_link_hash_entry
*h
;
4780 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4784 /* If this is a default version (the name contains @@), look up the
4785 symbol again with only one `@' as well as without the version.
4786 The effect is that references to the symbol with and without the
4787 version will be matched by the default symbol in the archive. */
4789 p
= strchr (name
, ELF_VER_CHR
);
4790 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4793 /* First check with only one `@'. */
4794 len
= strlen (name
);
4795 copy
= bfd_alloc (abfd
, len
);
4797 return (struct elf_link_hash_entry
*) 0 - 1;
4799 first
= p
- name
+ 1;
4800 memcpy (copy
, name
, first
);
4801 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4803 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4806 /* We also need to check references to the symbol without the
4808 copy
[first
- 1] = '\0';
4809 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4810 FALSE
, FALSE
, FALSE
);
4813 bfd_release (abfd
, copy
);
4817 /* Add symbols from an ELF archive file to the linker hash table. We
4818 don't use _bfd_generic_link_add_archive_symbols because of a
4819 problem which arises on UnixWare. The UnixWare libc.so is an
4820 archive which includes an entry libc.so.1 which defines a bunch of
4821 symbols. The libc.so archive also includes a number of other
4822 object files, which also define symbols, some of which are the same
4823 as those defined in libc.so.1. Correct linking requires that we
4824 consider each object file in turn, and include it if it defines any
4825 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4826 this; it looks through the list of undefined symbols, and includes
4827 any object file which defines them. When this algorithm is used on
4828 UnixWare, it winds up pulling in libc.so.1 early and defining a
4829 bunch of symbols. This means that some of the other objects in the
4830 archive are not included in the link, which is incorrect since they
4831 precede libc.so.1 in the archive.
4833 Fortunately, ELF archive handling is simpler than that done by
4834 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4835 oddities. In ELF, if we find a symbol in the archive map, and the
4836 symbol is currently undefined, we know that we must pull in that
4839 Unfortunately, we do have to make multiple passes over the symbol
4840 table until nothing further is resolved. */
4843 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4846 bfd_boolean
*defined
= NULL
;
4847 bfd_boolean
*included
= NULL
;
4851 const struct elf_backend_data
*bed
;
4852 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4853 (bfd
*, struct bfd_link_info
*, const char *);
4855 if (! bfd_has_map (abfd
))
4857 /* An empty archive is a special case. */
4858 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4860 bfd_set_error (bfd_error_no_armap
);
4864 /* Keep track of all symbols we know to be already defined, and all
4865 files we know to be already included. This is to speed up the
4866 second and subsequent passes. */
4867 c
= bfd_ardata (abfd
)->symdef_count
;
4871 amt
*= sizeof (bfd_boolean
);
4872 defined
= bfd_zmalloc (amt
);
4873 included
= bfd_zmalloc (amt
);
4874 if (defined
== NULL
|| included
== NULL
)
4877 symdefs
= bfd_ardata (abfd
)->symdefs
;
4878 bed
= get_elf_backend_data (abfd
);
4879 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
4892 symdefend
= symdef
+ c
;
4893 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
4895 struct elf_link_hash_entry
*h
;
4897 struct bfd_link_hash_entry
*undefs_tail
;
4900 if (defined
[i
] || included
[i
])
4902 if (symdef
->file_offset
== last
)
4908 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
4909 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
4915 if (h
->root
.type
== bfd_link_hash_common
)
4917 /* We currently have a common symbol. The archive map contains
4918 a reference to this symbol, so we may want to include it. We
4919 only want to include it however, if this archive element
4920 contains a definition of the symbol, not just another common
4923 Unfortunately some archivers (including GNU ar) will put
4924 declarations of common symbols into their archive maps, as
4925 well as real definitions, so we cannot just go by the archive
4926 map alone. Instead we must read in the element's symbol
4927 table and check that to see what kind of symbol definition
4929 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
4932 else if (h
->root
.type
!= bfd_link_hash_undefined
)
4934 if (h
->root
.type
!= bfd_link_hash_undefweak
)
4939 /* We need to include this archive member. */
4940 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
4941 if (element
== NULL
)
4944 if (! bfd_check_format (element
, bfd_object
))
4947 /* Doublecheck that we have not included this object
4948 already--it should be impossible, but there may be
4949 something wrong with the archive. */
4950 if (element
->archive_pass
!= 0)
4952 bfd_set_error (bfd_error_bad_value
);
4955 element
->archive_pass
= 1;
4957 undefs_tail
= info
->hash
->undefs_tail
;
4959 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
4962 if (! bfd_link_add_symbols (element
, info
))
4965 /* If there are any new undefined symbols, we need to make
4966 another pass through the archive in order to see whether
4967 they can be defined. FIXME: This isn't perfect, because
4968 common symbols wind up on undefs_tail and because an
4969 undefined symbol which is defined later on in this pass
4970 does not require another pass. This isn't a bug, but it
4971 does make the code less efficient than it could be. */
4972 if (undefs_tail
!= info
->hash
->undefs_tail
)
4975 /* Look backward to mark all symbols from this object file
4976 which we have already seen in this pass. */
4980 included
[mark
] = TRUE
;
4985 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
4987 /* We mark subsequent symbols from this object file as we go
4988 on through the loop. */
4989 last
= symdef
->file_offset
;
5000 if (defined
!= NULL
)
5002 if (included
!= NULL
)
5007 /* Given an ELF BFD, add symbols to the global hash table as
5011 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5013 switch (bfd_get_format (abfd
))
5016 return elf_link_add_object_symbols (abfd
, info
);
5018 return elf_link_add_archive_symbols (abfd
, info
);
5020 bfd_set_error (bfd_error_wrong_format
);
5025 struct hash_codes_info
5027 unsigned long *hashcodes
;
5031 /* This function will be called though elf_link_hash_traverse to store
5032 all hash value of the exported symbols in an array. */
5035 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5037 struct hash_codes_info
*inf
= data
;
5043 if (h
->root
.type
== bfd_link_hash_warning
)
5044 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5046 /* Ignore indirect symbols. These are added by the versioning code. */
5047 if (h
->dynindx
== -1)
5050 name
= h
->root
.root
.string
;
5051 p
= strchr (name
, ELF_VER_CHR
);
5054 alc
= bfd_malloc (p
- name
+ 1);
5060 memcpy (alc
, name
, p
- name
);
5061 alc
[p
- name
] = '\0';
5065 /* Compute the hash value. */
5066 ha
= bfd_elf_hash (name
);
5068 /* Store the found hash value in the array given as the argument. */
5069 *(inf
->hashcodes
)++ = ha
;
5071 /* And store it in the struct so that we can put it in the hash table
5073 h
->u
.elf_hash_value
= ha
;
5081 struct collect_gnu_hash_codes
5084 const struct elf_backend_data
*bed
;
5085 unsigned long int nsyms
;
5086 unsigned long int maskbits
;
5087 unsigned long int *hashcodes
;
5088 unsigned long int *hashval
;
5089 unsigned long int *indx
;
5090 unsigned long int *counts
;
5093 long int min_dynindx
;
5094 unsigned long int bucketcount
;
5095 unsigned long int symindx
;
5096 long int local_indx
;
5097 long int shift1
, shift2
;
5098 unsigned long int mask
;
5102 /* This function will be called though elf_link_hash_traverse to store
5103 all hash value of the exported symbols in an array. */
5106 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5108 struct collect_gnu_hash_codes
*s
= data
;
5114 if (h
->root
.type
== bfd_link_hash_warning
)
5115 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5117 /* Ignore indirect symbols. These are added by the versioning code. */
5118 if (h
->dynindx
== -1)
5121 /* Ignore also local symbols and undefined symbols. */
5122 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5125 name
= h
->root
.root
.string
;
5126 p
= strchr (name
, ELF_VER_CHR
);
5129 alc
= bfd_malloc (p
- name
+ 1);
5135 memcpy (alc
, name
, p
- name
);
5136 alc
[p
- name
] = '\0';
5140 /* Compute the hash value. */
5141 ha
= bfd_elf_gnu_hash (name
);
5143 /* Store the found hash value in the array for compute_bucket_count,
5144 and also for .dynsym reordering purposes. */
5145 s
->hashcodes
[s
->nsyms
] = ha
;
5146 s
->hashval
[h
->dynindx
] = ha
;
5148 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5149 s
->min_dynindx
= h
->dynindx
;
5157 /* This function will be called though elf_link_hash_traverse to do
5158 final dynaminc symbol renumbering. */
5161 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5163 struct collect_gnu_hash_codes
*s
= data
;
5164 unsigned long int bucket
;
5165 unsigned long int val
;
5167 if (h
->root
.type
== bfd_link_hash_warning
)
5168 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5170 /* Ignore indirect symbols. */
5171 if (h
->dynindx
== -1)
5174 /* Ignore also local symbols and undefined symbols. */
5175 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5177 if (h
->dynindx
>= s
->min_dynindx
)
5178 h
->dynindx
= s
->local_indx
++;
5182 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5183 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5184 & ((s
->maskbits
>> s
->shift1
) - 1);
5185 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5187 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5188 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5189 if (s
->counts
[bucket
] == 1)
5190 /* Last element terminates the chain. */
5192 bfd_put_32 (s
->output_bfd
, val
,
5193 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5194 --s
->counts
[bucket
];
5195 h
->dynindx
= s
->indx
[bucket
]++;
5199 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5202 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5204 return !(h
->forced_local
5205 || h
->root
.type
== bfd_link_hash_undefined
5206 || h
->root
.type
== bfd_link_hash_undefweak
5207 || ((h
->root
.type
== bfd_link_hash_defined
5208 || h
->root
.type
== bfd_link_hash_defweak
)
5209 && h
->root
.u
.def
.section
->output_section
== NULL
));
5212 /* Array used to determine the number of hash table buckets to use
5213 based on the number of symbols there are. If there are fewer than
5214 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5215 fewer than 37 we use 17 buckets, and so forth. We never use more
5216 than 32771 buckets. */
5218 static const size_t elf_buckets
[] =
5220 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5224 /* Compute bucket count for hashing table. We do not use a static set
5225 of possible tables sizes anymore. Instead we determine for all
5226 possible reasonable sizes of the table the outcome (i.e., the
5227 number of collisions etc) and choose the best solution. The
5228 weighting functions are not too simple to allow the table to grow
5229 without bounds. Instead one of the weighting factors is the size.
5230 Therefore the result is always a good payoff between few collisions
5231 (= short chain lengths) and table size. */
5233 compute_bucket_count (struct bfd_link_info
*info
,
5234 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5235 unsigned long int nsyms
,
5238 size_t best_size
= 0;
5239 unsigned long int i
;
5241 /* We have a problem here. The following code to optimize the table
5242 size requires an integer type with more the 32 bits. If
5243 BFD_HOST_U_64_BIT is set we know about such a type. */
5244 #ifdef BFD_HOST_U_64_BIT
5249 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5250 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5251 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5252 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5253 unsigned long int *counts
;
5256 /* Possible optimization parameters: if we have NSYMS symbols we say
5257 that the hashing table must at least have NSYMS/4 and at most
5259 minsize
= nsyms
/ 4;
5262 best_size
= maxsize
= nsyms
* 2;
5267 if ((best_size
& 31) == 0)
5271 /* Create array where we count the collisions in. We must use bfd_malloc
5272 since the size could be large. */
5274 amt
*= sizeof (unsigned long int);
5275 counts
= bfd_malloc (amt
);
5279 /* Compute the "optimal" size for the hash table. The criteria is a
5280 minimal chain length. The minor criteria is (of course) the size
5282 for (i
= minsize
; i
< maxsize
; ++i
)
5284 /* Walk through the array of hashcodes and count the collisions. */
5285 BFD_HOST_U_64_BIT max
;
5286 unsigned long int j
;
5287 unsigned long int fact
;
5289 if (gnu_hash
&& (i
& 31) == 0)
5292 memset (counts
, '\0', i
* sizeof (unsigned long int));
5294 /* Determine how often each hash bucket is used. */
5295 for (j
= 0; j
< nsyms
; ++j
)
5296 ++counts
[hashcodes
[j
] % i
];
5298 /* For the weight function we need some information about the
5299 pagesize on the target. This is information need not be 100%
5300 accurate. Since this information is not available (so far) we
5301 define it here to a reasonable default value. If it is crucial
5302 to have a better value some day simply define this value. */
5303 # ifndef BFD_TARGET_PAGESIZE
5304 # define BFD_TARGET_PAGESIZE (4096)
5307 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5309 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5312 /* Variant 1: optimize for short chains. We add the squares
5313 of all the chain lengths (which favors many small chain
5314 over a few long chains). */
5315 for (j
= 0; j
< i
; ++j
)
5316 max
+= counts
[j
] * counts
[j
];
5318 /* This adds penalties for the overall size of the table. */
5319 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5322 /* Variant 2: Optimize a lot more for small table. Here we
5323 also add squares of the size but we also add penalties for
5324 empty slots (the +1 term). */
5325 for (j
= 0; j
< i
; ++j
)
5326 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5328 /* The overall size of the table is considered, but not as
5329 strong as in variant 1, where it is squared. */
5330 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5334 /* Compare with current best results. */
5335 if (max
< best_chlen
)
5345 #endif /* defined (BFD_HOST_U_64_BIT) */
5347 /* This is the fallback solution if no 64bit type is available or if we
5348 are not supposed to spend much time on optimizations. We select the
5349 bucket count using a fixed set of numbers. */
5350 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5352 best_size
= elf_buckets
[i
];
5353 if (nsyms
< elf_buckets
[i
+ 1])
5356 if (gnu_hash
&& best_size
< 2)
5363 /* Set up the sizes and contents of the ELF dynamic sections. This is
5364 called by the ELF linker emulation before_allocation routine. We
5365 must set the sizes of the sections before the linker sets the
5366 addresses of the various sections. */
5369 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5372 const char *filter_shlib
,
5373 const char * const *auxiliary_filters
,
5374 struct bfd_link_info
*info
,
5375 asection
**sinterpptr
,
5376 struct bfd_elf_version_tree
*verdefs
)
5378 bfd_size_type soname_indx
;
5380 const struct elf_backend_data
*bed
;
5381 struct elf_assign_sym_version_info asvinfo
;
5385 soname_indx
= (bfd_size_type
) -1;
5387 if (!is_elf_hash_table (info
->hash
))
5390 bed
= get_elf_backend_data (output_bfd
);
5391 if (info
->execstack
)
5392 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
5393 else if (info
->noexecstack
)
5394 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
5398 asection
*notesec
= NULL
;
5401 for (inputobj
= info
->input_bfds
;
5403 inputobj
= inputobj
->link_next
)
5407 if (inputobj
->flags
& (DYNAMIC
| BFD_LINKER_CREATED
))
5409 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5412 if (s
->flags
& SEC_CODE
)
5416 else if (bed
->default_execstack
)
5421 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
5422 if (exec
&& info
->relocatable
5423 && notesec
->output_section
!= bfd_abs_section_ptr
)
5424 notesec
->output_section
->flags
|= SEC_CODE
;
5428 /* Any syms created from now on start with -1 in
5429 got.refcount/offset and plt.refcount/offset. */
5430 elf_hash_table (info
)->init_got_refcount
5431 = elf_hash_table (info
)->init_got_offset
;
5432 elf_hash_table (info
)->init_plt_refcount
5433 = elf_hash_table (info
)->init_plt_offset
;
5435 /* The backend may have to create some sections regardless of whether
5436 we're dynamic or not. */
5437 if (bed
->elf_backend_always_size_sections
5438 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5441 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
5444 dynobj
= elf_hash_table (info
)->dynobj
;
5446 /* If there were no dynamic objects in the link, there is nothing to
5451 if (elf_hash_table (info
)->dynamic_sections_created
)
5453 struct elf_info_failed eif
;
5454 struct elf_link_hash_entry
*h
;
5456 struct bfd_elf_version_tree
*t
;
5457 struct bfd_elf_version_expr
*d
;
5459 bfd_boolean all_defined
;
5461 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
5462 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
5466 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5468 if (soname_indx
== (bfd_size_type
) -1
5469 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5475 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5477 info
->flags
|= DF_SYMBOLIC
;
5484 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5486 if (indx
== (bfd_size_type
) -1
5487 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
5490 if (info
->new_dtags
)
5492 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
5493 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
5498 if (filter_shlib
!= NULL
)
5502 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5503 filter_shlib
, TRUE
);
5504 if (indx
== (bfd_size_type
) -1
5505 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5509 if (auxiliary_filters
!= NULL
)
5511 const char * const *p
;
5513 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5517 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5519 if (indx
== (bfd_size_type
) -1
5520 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5526 eif
.verdefs
= verdefs
;
5529 /* If we are supposed to export all symbols into the dynamic symbol
5530 table (this is not the normal case), then do so. */
5531 if (info
->export_dynamic
5532 || (info
->executable
&& info
->dynamic
))
5534 elf_link_hash_traverse (elf_hash_table (info
),
5535 _bfd_elf_export_symbol
,
5541 /* Make all global versions with definition. */
5542 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5543 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5544 if (!d
->symver
&& d
->symbol
)
5546 const char *verstr
, *name
;
5547 size_t namelen
, verlen
, newlen
;
5549 struct elf_link_hash_entry
*newh
;
5552 namelen
= strlen (name
);
5554 verlen
= strlen (verstr
);
5555 newlen
= namelen
+ verlen
+ 3;
5557 newname
= bfd_malloc (newlen
);
5558 if (newname
== NULL
)
5560 memcpy (newname
, name
, namelen
);
5562 /* Check the hidden versioned definition. */
5563 p
= newname
+ namelen
;
5565 memcpy (p
, verstr
, verlen
+ 1);
5566 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5567 newname
, FALSE
, FALSE
,
5570 || (newh
->root
.type
!= bfd_link_hash_defined
5571 && newh
->root
.type
!= bfd_link_hash_defweak
))
5573 /* Check the default versioned definition. */
5575 memcpy (p
, verstr
, verlen
+ 1);
5576 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5577 newname
, FALSE
, FALSE
,
5582 /* Mark this version if there is a definition and it is
5583 not defined in a shared object. */
5585 && !newh
->def_dynamic
5586 && (newh
->root
.type
== bfd_link_hash_defined
5587 || newh
->root
.type
== bfd_link_hash_defweak
))
5591 /* Attach all the symbols to their version information. */
5592 asvinfo
.output_bfd
= output_bfd
;
5593 asvinfo
.info
= info
;
5594 asvinfo
.verdefs
= verdefs
;
5595 asvinfo
.failed
= FALSE
;
5597 elf_link_hash_traverse (elf_hash_table (info
),
5598 _bfd_elf_link_assign_sym_version
,
5603 if (!info
->allow_undefined_version
)
5605 /* Check if all global versions have a definition. */
5607 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5608 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5609 if (!d
->symver
&& !d
->script
)
5611 (*_bfd_error_handler
)
5612 (_("%s: undefined version: %s"),
5613 d
->pattern
, t
->name
);
5614 all_defined
= FALSE
;
5619 bfd_set_error (bfd_error_bad_value
);
5624 /* Find all symbols which were defined in a dynamic object and make
5625 the backend pick a reasonable value for them. */
5626 elf_link_hash_traverse (elf_hash_table (info
),
5627 _bfd_elf_adjust_dynamic_symbol
,
5632 /* Add some entries to the .dynamic section. We fill in some of the
5633 values later, in bfd_elf_final_link, but we must add the entries
5634 now so that we know the final size of the .dynamic section. */
5636 /* If there are initialization and/or finalization functions to
5637 call then add the corresponding DT_INIT/DT_FINI entries. */
5638 h
= (info
->init_function
5639 ? elf_link_hash_lookup (elf_hash_table (info
),
5640 info
->init_function
, FALSE
,
5647 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5650 h
= (info
->fini_function
5651 ? elf_link_hash_lookup (elf_hash_table (info
),
5652 info
->fini_function
, FALSE
,
5659 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5663 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
5664 if (s
!= NULL
&& s
->linker_has_input
)
5666 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5667 if (! info
->executable
)
5672 for (sub
= info
->input_bfds
; sub
!= NULL
;
5673 sub
= sub
->link_next
)
5674 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
5675 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5676 if (elf_section_data (o
)->this_hdr
.sh_type
5677 == SHT_PREINIT_ARRAY
)
5679 (*_bfd_error_handler
)
5680 (_("%B: .preinit_array section is not allowed in DSO"),
5685 bfd_set_error (bfd_error_nonrepresentable_section
);
5689 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5690 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5693 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
5694 if (s
!= NULL
&& s
->linker_has_input
)
5696 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5697 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5700 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
5701 if (s
!= NULL
&& s
->linker_has_input
)
5703 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5704 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5708 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
5709 /* If .dynstr is excluded from the link, we don't want any of
5710 these tags. Strictly, we should be checking each section
5711 individually; This quick check covers for the case where
5712 someone does a /DISCARD/ : { *(*) }. */
5713 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5715 bfd_size_type strsize
;
5717 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5718 if ((info
->emit_hash
5719 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
5720 || (info
->emit_gnu_hash
5721 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
5722 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5723 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5724 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5725 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5726 bed
->s
->sizeof_sym
))
5731 /* The backend must work out the sizes of all the other dynamic
5733 if (bed
->elf_backend_size_dynamic_sections
5734 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5737 if (elf_hash_table (info
)->dynamic_sections_created
)
5739 unsigned long section_sym_count
;
5742 /* Set up the version definition section. */
5743 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5744 BFD_ASSERT (s
!= NULL
);
5746 /* We may have created additional version definitions if we are
5747 just linking a regular application. */
5748 verdefs
= asvinfo
.verdefs
;
5750 /* Skip anonymous version tag. */
5751 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5752 verdefs
= verdefs
->next
;
5754 if (verdefs
== NULL
&& !info
->create_default_symver
)
5755 s
->flags
|= SEC_EXCLUDE
;
5760 struct bfd_elf_version_tree
*t
;
5762 Elf_Internal_Verdef def
;
5763 Elf_Internal_Verdaux defaux
;
5764 struct bfd_link_hash_entry
*bh
;
5765 struct elf_link_hash_entry
*h
;
5771 /* Make space for the base version. */
5772 size
+= sizeof (Elf_External_Verdef
);
5773 size
+= sizeof (Elf_External_Verdaux
);
5776 /* Make space for the default version. */
5777 if (info
->create_default_symver
)
5779 size
+= sizeof (Elf_External_Verdef
);
5783 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5785 struct bfd_elf_version_deps
*n
;
5787 size
+= sizeof (Elf_External_Verdef
);
5788 size
+= sizeof (Elf_External_Verdaux
);
5791 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5792 size
+= sizeof (Elf_External_Verdaux
);
5796 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5797 if (s
->contents
== NULL
&& s
->size
!= 0)
5800 /* Fill in the version definition section. */
5804 def
.vd_version
= VER_DEF_CURRENT
;
5805 def
.vd_flags
= VER_FLG_BASE
;
5808 if (info
->create_default_symver
)
5810 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
5811 def
.vd_next
= sizeof (Elf_External_Verdef
);
5815 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5816 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5817 + sizeof (Elf_External_Verdaux
));
5820 if (soname_indx
!= (bfd_size_type
) -1)
5822 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5824 def
.vd_hash
= bfd_elf_hash (soname
);
5825 defaux
.vda_name
= soname_indx
;
5832 name
= lbasename (output_bfd
->filename
);
5833 def
.vd_hash
= bfd_elf_hash (name
);
5834 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5836 if (indx
== (bfd_size_type
) -1)
5838 defaux
.vda_name
= indx
;
5840 defaux
.vda_next
= 0;
5842 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5843 (Elf_External_Verdef
*) p
);
5844 p
+= sizeof (Elf_External_Verdef
);
5845 if (info
->create_default_symver
)
5847 /* Add a symbol representing this version. */
5849 if (! (_bfd_generic_link_add_one_symbol
5850 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5852 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5854 h
= (struct elf_link_hash_entry
*) bh
;
5857 h
->type
= STT_OBJECT
;
5858 h
->verinfo
.vertree
= NULL
;
5860 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5863 /* Create a duplicate of the base version with the same
5864 aux block, but different flags. */
5867 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5869 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5870 + sizeof (Elf_External_Verdaux
));
5873 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5874 (Elf_External_Verdef
*) p
);
5875 p
+= sizeof (Elf_External_Verdef
);
5877 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5878 (Elf_External_Verdaux
*) p
);
5879 p
+= sizeof (Elf_External_Verdaux
);
5881 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5884 struct bfd_elf_version_deps
*n
;
5887 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5890 /* Add a symbol representing this version. */
5892 if (! (_bfd_generic_link_add_one_symbol
5893 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5895 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5897 h
= (struct elf_link_hash_entry
*) bh
;
5900 h
->type
= STT_OBJECT
;
5901 h
->verinfo
.vertree
= t
;
5903 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5906 def
.vd_version
= VER_DEF_CURRENT
;
5908 if (t
->globals
.list
== NULL
5909 && t
->locals
.list
== NULL
5911 def
.vd_flags
|= VER_FLG_WEAK
;
5912 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
5913 def
.vd_cnt
= cdeps
+ 1;
5914 def
.vd_hash
= bfd_elf_hash (t
->name
);
5915 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5917 if (t
->next
!= NULL
)
5918 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5919 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
5921 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5922 (Elf_External_Verdef
*) p
);
5923 p
+= sizeof (Elf_External_Verdef
);
5925 defaux
.vda_name
= h
->dynstr_index
;
5926 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5928 defaux
.vda_next
= 0;
5929 if (t
->deps
!= NULL
)
5930 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5931 t
->name_indx
= defaux
.vda_name
;
5933 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5934 (Elf_External_Verdaux
*) p
);
5935 p
+= sizeof (Elf_External_Verdaux
);
5937 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5939 if (n
->version_needed
== NULL
)
5941 /* This can happen if there was an error in the
5943 defaux
.vda_name
= 0;
5947 defaux
.vda_name
= n
->version_needed
->name_indx
;
5948 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5951 if (n
->next
== NULL
)
5952 defaux
.vda_next
= 0;
5954 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5956 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5957 (Elf_External_Verdaux
*) p
);
5958 p
+= sizeof (Elf_External_Verdaux
);
5962 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
5963 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
5966 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
5969 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
5971 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
5974 else if (info
->flags
& DF_BIND_NOW
)
5976 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
5982 if (info
->executable
)
5983 info
->flags_1
&= ~ (DF_1_INITFIRST
5986 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
5990 /* Work out the size of the version reference section. */
5992 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
5993 BFD_ASSERT (s
!= NULL
);
5995 struct elf_find_verdep_info sinfo
;
5997 sinfo
.output_bfd
= output_bfd
;
5999 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6000 if (sinfo
.vers
== 0)
6002 sinfo
.failed
= FALSE
;
6004 elf_link_hash_traverse (elf_hash_table (info
),
6005 _bfd_elf_link_find_version_dependencies
,
6010 if (elf_tdata (output_bfd
)->verref
== NULL
)
6011 s
->flags
|= SEC_EXCLUDE
;
6014 Elf_Internal_Verneed
*t
;
6019 /* Build the version definition section. */
6022 for (t
= elf_tdata (output_bfd
)->verref
;
6026 Elf_Internal_Vernaux
*a
;
6028 size
+= sizeof (Elf_External_Verneed
);
6030 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6031 size
+= sizeof (Elf_External_Vernaux
);
6035 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
6036 if (s
->contents
== NULL
)
6040 for (t
= elf_tdata (output_bfd
)->verref
;
6045 Elf_Internal_Vernaux
*a
;
6049 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6052 t
->vn_version
= VER_NEED_CURRENT
;
6054 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6055 elf_dt_name (t
->vn_bfd
) != NULL
6056 ? elf_dt_name (t
->vn_bfd
)
6057 : lbasename (t
->vn_bfd
->filename
),
6059 if (indx
== (bfd_size_type
) -1)
6062 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6063 if (t
->vn_nextref
== NULL
)
6066 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6067 + caux
* sizeof (Elf_External_Vernaux
));
6069 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6070 (Elf_External_Verneed
*) p
);
6071 p
+= sizeof (Elf_External_Verneed
);
6073 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6075 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6076 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6077 a
->vna_nodename
, FALSE
);
6078 if (indx
== (bfd_size_type
) -1)
6081 if (a
->vna_nextptr
== NULL
)
6084 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6086 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6087 (Elf_External_Vernaux
*) p
);
6088 p
+= sizeof (Elf_External_Vernaux
);
6092 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6093 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6096 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6100 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6101 && elf_tdata (output_bfd
)->cverdefs
== 0)
6102 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6103 §ion_sym_count
) == 0)
6105 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6106 s
->flags
|= SEC_EXCLUDE
;
6112 /* Find the first non-excluded output section. We'll use its
6113 section symbol for some emitted relocs. */
6115 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6119 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6120 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6121 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6123 elf_hash_table (info
)->text_index_section
= s
;
6128 /* Find two non-excluded output sections, one for code, one for data.
6129 We'll use their section symbols for some emitted relocs. */
6131 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6135 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6136 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6137 == (SEC_ALLOC
| SEC_READONLY
))
6138 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6140 elf_hash_table (info
)->text_index_section
= s
;
6144 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6145 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6146 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6148 elf_hash_table (info
)->data_index_section
= s
;
6152 if (elf_hash_table (info
)->text_index_section
== NULL
)
6153 elf_hash_table (info
)->text_index_section
6154 = elf_hash_table (info
)->data_index_section
;
6158 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6160 const struct elf_backend_data
*bed
;
6162 if (!is_elf_hash_table (info
->hash
))
6165 bed
= get_elf_backend_data (output_bfd
);
6166 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6168 if (elf_hash_table (info
)->dynamic_sections_created
)
6172 bfd_size_type dynsymcount
;
6173 unsigned long section_sym_count
;
6174 unsigned int dtagcount
;
6176 dynobj
= elf_hash_table (info
)->dynobj
;
6178 /* Assign dynsym indicies. In a shared library we generate a
6179 section symbol for each output section, which come first.
6180 Next come all of the back-end allocated local dynamic syms,
6181 followed by the rest of the global symbols. */
6183 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6184 §ion_sym_count
);
6186 /* Work out the size of the symbol version section. */
6187 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6188 BFD_ASSERT (s
!= NULL
);
6189 if (dynsymcount
!= 0
6190 && (s
->flags
& SEC_EXCLUDE
) == 0)
6192 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6193 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
6194 if (s
->contents
== NULL
)
6197 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6201 /* Set the size of the .dynsym and .hash sections. We counted
6202 the number of dynamic symbols in elf_link_add_object_symbols.
6203 We will build the contents of .dynsym and .hash when we build
6204 the final symbol table, because until then we do not know the
6205 correct value to give the symbols. We built the .dynstr
6206 section as we went along in elf_link_add_object_symbols. */
6207 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
6208 BFD_ASSERT (s
!= NULL
);
6209 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6211 if (dynsymcount
!= 0)
6213 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
6214 if (s
->contents
== NULL
)
6217 /* The first entry in .dynsym is a dummy symbol.
6218 Clear all the section syms, in case we don't output them all. */
6219 ++section_sym_count
;
6220 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6223 elf_hash_table (info
)->bucketcount
= 0;
6225 /* Compute the size of the hashing table. As a side effect this
6226 computes the hash values for all the names we export. */
6227 if (info
->emit_hash
)
6229 unsigned long int *hashcodes
;
6230 struct hash_codes_info hashinf
;
6232 unsigned long int nsyms
;
6234 size_t hash_entry_size
;
6236 /* Compute the hash values for all exported symbols. At the same
6237 time store the values in an array so that we could use them for
6239 amt
= dynsymcount
* sizeof (unsigned long int);
6240 hashcodes
= bfd_malloc (amt
);
6241 if (hashcodes
== NULL
)
6243 hashinf
.hashcodes
= hashcodes
;
6244 hashinf
.error
= FALSE
;
6246 /* Put all hash values in HASHCODES. */
6247 elf_link_hash_traverse (elf_hash_table (info
),
6248 elf_collect_hash_codes
, &hashinf
);
6252 nsyms
= hashinf
.hashcodes
- hashcodes
;
6254 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6257 if (bucketcount
== 0)
6260 elf_hash_table (info
)->bucketcount
= bucketcount
;
6262 s
= bfd_get_section_by_name (dynobj
, ".hash");
6263 BFD_ASSERT (s
!= NULL
);
6264 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6265 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6266 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
6267 if (s
->contents
== NULL
)
6270 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6271 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6272 s
->contents
+ hash_entry_size
);
6275 if (info
->emit_gnu_hash
)
6278 unsigned char *contents
;
6279 struct collect_gnu_hash_codes cinfo
;
6283 memset (&cinfo
, 0, sizeof (cinfo
));
6285 /* Compute the hash values for all exported symbols. At the same
6286 time store the values in an array so that we could use them for
6288 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6289 cinfo
.hashcodes
= bfd_malloc (amt
);
6290 if (cinfo
.hashcodes
== NULL
)
6293 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6294 cinfo
.min_dynindx
= -1;
6295 cinfo
.output_bfd
= output_bfd
;
6298 /* Put all hash values in HASHCODES. */
6299 elf_link_hash_traverse (elf_hash_table (info
),
6300 elf_collect_gnu_hash_codes
, &cinfo
);
6305 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6307 if (bucketcount
== 0)
6309 free (cinfo
.hashcodes
);
6313 s
= bfd_get_section_by_name (dynobj
, ".gnu.hash");
6314 BFD_ASSERT (s
!= NULL
);
6316 if (cinfo
.nsyms
== 0)
6318 /* Empty .gnu.hash section is special. */
6319 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6320 free (cinfo
.hashcodes
);
6321 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6322 contents
= bfd_zalloc (output_bfd
, s
->size
);
6323 if (contents
== NULL
)
6325 s
->contents
= contents
;
6326 /* 1 empty bucket. */
6327 bfd_put_32 (output_bfd
, 1, contents
);
6328 /* SYMIDX above the special symbol 0. */
6329 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6330 /* Just one word for bitmask. */
6331 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6332 /* Only hash fn bloom filter. */
6333 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6334 /* No hashes are valid - empty bitmask. */
6335 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6336 /* No hashes in the only bucket. */
6337 bfd_put_32 (output_bfd
, 0,
6338 contents
+ 16 + bed
->s
->arch_size
/ 8);
6342 unsigned long int maskwords
, maskbitslog2
;
6343 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6345 maskbitslog2
= bfd_log2 (cinfo
.nsyms
) + 1;
6346 if (maskbitslog2
< 3)
6348 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6349 maskbitslog2
= maskbitslog2
+ 3;
6351 maskbitslog2
= maskbitslog2
+ 2;
6352 if (bed
->s
->arch_size
== 64)
6354 if (maskbitslog2
== 5)
6360 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6361 cinfo
.shift2
= maskbitslog2
;
6362 cinfo
.maskbits
= 1 << maskbitslog2
;
6363 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6364 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6365 amt
+= maskwords
* sizeof (bfd_vma
);
6366 cinfo
.bitmask
= bfd_malloc (amt
);
6367 if (cinfo
.bitmask
== NULL
)
6369 free (cinfo
.hashcodes
);
6373 cinfo
.counts
= (void *) (cinfo
.bitmask
+ maskwords
);
6374 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6375 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6376 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6378 /* Determine how often each hash bucket is used. */
6379 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6380 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6381 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6383 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6384 if (cinfo
.counts
[i
] != 0)
6386 cinfo
.indx
[i
] = cnt
;
6387 cnt
+= cinfo
.counts
[i
];
6389 BFD_ASSERT (cnt
== dynsymcount
);
6390 cinfo
.bucketcount
= bucketcount
;
6391 cinfo
.local_indx
= cinfo
.min_dynindx
;
6393 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6394 s
->size
+= cinfo
.maskbits
/ 8;
6395 contents
= bfd_zalloc (output_bfd
, s
->size
);
6396 if (contents
== NULL
)
6398 free (cinfo
.bitmask
);
6399 free (cinfo
.hashcodes
);
6403 s
->contents
= contents
;
6404 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6405 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6406 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6407 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6408 contents
+= 16 + cinfo
.maskbits
/ 8;
6410 for (i
= 0; i
< bucketcount
; ++i
)
6412 if (cinfo
.counts
[i
] == 0)
6413 bfd_put_32 (output_bfd
, 0, contents
);
6415 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6419 cinfo
.contents
= contents
;
6421 /* Renumber dynamic symbols, populate .gnu.hash section. */
6422 elf_link_hash_traverse (elf_hash_table (info
),
6423 elf_renumber_gnu_hash_syms
, &cinfo
);
6425 contents
= s
->contents
+ 16;
6426 for (i
= 0; i
< maskwords
; ++i
)
6428 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6430 contents
+= bed
->s
->arch_size
/ 8;
6433 free (cinfo
.bitmask
);
6434 free (cinfo
.hashcodes
);
6438 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
6439 BFD_ASSERT (s
!= NULL
);
6441 elf_finalize_dynstr (output_bfd
, info
);
6443 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6445 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6446 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
6453 /* Indicate that we are only retrieving symbol values from this
6457 _bfd_elf_link_just_syms (asection
*sec
, struct bfd_link_info
*info
)
6459 if (is_elf_hash_table (info
->hash
))
6460 sec
->sec_info_type
= ELF_INFO_TYPE_JUST_SYMS
;
6461 _bfd_generic_link_just_syms (sec
, info
);
6464 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6467 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
6470 BFD_ASSERT (sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
);
6471 sec
->sec_info_type
= ELF_INFO_TYPE_NONE
;
6474 /* Finish SHF_MERGE section merging. */
6477 _bfd_elf_merge_sections (bfd
*abfd
, struct bfd_link_info
*info
)
6482 if (!is_elf_hash_table (info
->hash
))
6485 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
6486 if ((ibfd
->flags
& DYNAMIC
) == 0)
6487 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6488 if ((sec
->flags
& SEC_MERGE
) != 0
6489 && !bfd_is_abs_section (sec
->output_section
))
6491 struct bfd_elf_section_data
*secdata
;
6493 secdata
= elf_section_data (sec
);
6494 if (! _bfd_add_merge_section (abfd
,
6495 &elf_hash_table (info
)->merge_info
,
6496 sec
, &secdata
->sec_info
))
6498 else if (secdata
->sec_info
)
6499 sec
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
6502 if (elf_hash_table (info
)->merge_info
!= NULL
)
6503 _bfd_merge_sections (abfd
, info
, elf_hash_table (info
)->merge_info
,
6504 merge_sections_remove_hook
);
6508 /* Create an entry in an ELF linker hash table. */
6510 struct bfd_hash_entry
*
6511 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
6512 struct bfd_hash_table
*table
,
6515 /* Allocate the structure if it has not already been allocated by a
6519 entry
= bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
6524 /* Call the allocation method of the superclass. */
6525 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
6528 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
6529 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
6531 /* Set local fields. */
6534 ret
->got
= htab
->init_got_refcount
;
6535 ret
->plt
= htab
->init_plt_refcount
;
6536 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
6537 - offsetof (struct elf_link_hash_entry
, size
)));
6538 /* Assume that we have been called by a non-ELF symbol reader.
6539 This flag is then reset by the code which reads an ELF input
6540 file. This ensures that a symbol created by a non-ELF symbol
6541 reader will have the flag set correctly. */
6548 /* Copy data from an indirect symbol to its direct symbol, hiding the
6549 old indirect symbol. Also used for copying flags to a weakdef. */
6552 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
6553 struct elf_link_hash_entry
*dir
,
6554 struct elf_link_hash_entry
*ind
)
6556 struct elf_link_hash_table
*htab
;
6558 /* Copy down any references that we may have already seen to the
6559 symbol which just became indirect. */
6561 dir
->ref_dynamic
|= ind
->ref_dynamic
;
6562 dir
->ref_regular
|= ind
->ref_regular
;
6563 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
6564 dir
->non_got_ref
|= ind
->non_got_ref
;
6565 dir
->needs_plt
|= ind
->needs_plt
;
6566 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
6568 if (ind
->root
.type
!= bfd_link_hash_indirect
)
6571 /* Copy over the global and procedure linkage table refcount entries.
6572 These may have been already set up by a check_relocs routine. */
6573 htab
= elf_hash_table (info
);
6574 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
6576 if (dir
->got
.refcount
< 0)
6577 dir
->got
.refcount
= 0;
6578 dir
->got
.refcount
+= ind
->got
.refcount
;
6579 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
6582 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
6584 if (dir
->plt
.refcount
< 0)
6585 dir
->plt
.refcount
= 0;
6586 dir
->plt
.refcount
+= ind
->plt
.refcount
;
6587 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
6590 if (ind
->dynindx
!= -1)
6592 if (dir
->dynindx
!= -1)
6593 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
6594 dir
->dynindx
= ind
->dynindx
;
6595 dir
->dynstr_index
= ind
->dynstr_index
;
6597 ind
->dynstr_index
= 0;
6602 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
6603 struct elf_link_hash_entry
*h
,
6604 bfd_boolean force_local
)
6606 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
6610 h
->forced_local
= 1;
6611 if (h
->dynindx
!= -1)
6614 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
6620 /* Initialize an ELF linker hash table. */
6623 _bfd_elf_link_hash_table_init
6624 (struct elf_link_hash_table
*table
,
6626 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
6627 struct bfd_hash_table
*,
6629 unsigned int entsize
)
6632 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
6634 memset (table
, 0, sizeof * table
);
6635 table
->init_got_refcount
.refcount
= can_refcount
- 1;
6636 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
6637 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
6638 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
6639 /* The first dynamic symbol is a dummy. */
6640 table
->dynsymcount
= 1;
6642 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
6643 table
->root
.type
= bfd_link_elf_hash_table
;
6648 /* Create an ELF linker hash table. */
6650 struct bfd_link_hash_table
*
6651 _bfd_elf_link_hash_table_create (bfd
*abfd
)
6653 struct elf_link_hash_table
*ret
;
6654 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
6656 ret
= bfd_malloc (amt
);
6660 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
6661 sizeof (struct elf_link_hash_entry
)))
6670 /* This is a hook for the ELF emulation code in the generic linker to
6671 tell the backend linker what file name to use for the DT_NEEDED
6672 entry for a dynamic object. */
6675 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
6677 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6678 && bfd_get_format (abfd
) == bfd_object
)
6679 elf_dt_name (abfd
) = name
;
6683 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
6686 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6687 && bfd_get_format (abfd
) == bfd_object
)
6688 lib_class
= elf_dyn_lib_class (abfd
);
6695 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
6697 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6698 && bfd_get_format (abfd
) == bfd_object
)
6699 elf_dyn_lib_class (abfd
) = lib_class
;
6702 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6703 the linker ELF emulation code. */
6705 struct bfd_link_needed_list
*
6706 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6707 struct bfd_link_info
*info
)
6709 if (! is_elf_hash_table (info
->hash
))
6711 return elf_hash_table (info
)->needed
;
6714 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6715 hook for the linker ELF emulation code. */
6717 struct bfd_link_needed_list
*
6718 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6719 struct bfd_link_info
*info
)
6721 if (! is_elf_hash_table (info
->hash
))
6723 return elf_hash_table (info
)->runpath
;
6726 /* Get the name actually used for a dynamic object for a link. This
6727 is the SONAME entry if there is one. Otherwise, it is the string
6728 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6731 bfd_elf_get_dt_soname (bfd
*abfd
)
6733 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6734 && bfd_get_format (abfd
) == bfd_object
)
6735 return elf_dt_name (abfd
);
6739 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6740 the ELF linker emulation code. */
6743 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
6744 struct bfd_link_needed_list
**pneeded
)
6747 bfd_byte
*dynbuf
= NULL
;
6748 unsigned int elfsec
;
6749 unsigned long shlink
;
6750 bfd_byte
*extdyn
, *extdynend
;
6752 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
6756 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
6757 || bfd_get_format (abfd
) != bfd_object
)
6760 s
= bfd_get_section_by_name (abfd
, ".dynamic");
6761 if (s
== NULL
|| s
->size
== 0)
6764 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
6767 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
6768 if (elfsec
== SHN_BAD
)
6771 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
6773 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
6774 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
6777 extdynend
= extdyn
+ s
->size
;
6778 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
6780 Elf_Internal_Dyn dyn
;
6782 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
6784 if (dyn
.d_tag
== DT_NULL
)
6787 if (dyn
.d_tag
== DT_NEEDED
)
6790 struct bfd_link_needed_list
*l
;
6791 unsigned int tagv
= dyn
.d_un
.d_val
;
6794 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
6799 l
= bfd_alloc (abfd
, amt
);
6820 struct elf_symbuf_symbol
6822 unsigned long st_name
; /* Symbol name, index in string tbl */
6823 unsigned char st_info
; /* Type and binding attributes */
6824 unsigned char st_other
; /* Visibilty, and target specific */
6827 struct elf_symbuf_head
6829 struct elf_symbuf_symbol
*ssym
;
6830 bfd_size_type count
;
6831 unsigned int st_shndx
;
6838 Elf_Internal_Sym
*isym
;
6839 struct elf_symbuf_symbol
*ssym
;
6844 /* Sort references to symbols by ascending section number. */
6847 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
6849 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
6850 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
6852 return s1
->st_shndx
- s2
->st_shndx
;
6856 elf_sym_name_compare (const void *arg1
, const void *arg2
)
6858 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
6859 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
6860 return strcmp (s1
->name
, s2
->name
);
6863 static struct elf_symbuf_head
*
6864 elf_create_symbuf (bfd_size_type symcount
, Elf_Internal_Sym
*isymbuf
)
6866 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
6867 struct elf_symbuf_symbol
*ssym
;
6868 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
6869 bfd_size_type i
, shndx_count
, total_size
;
6871 indbuf
= bfd_malloc2 (symcount
, sizeof (*indbuf
));
6875 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
6876 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
6877 *ind
++ = &isymbuf
[i
];
6880 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
6881 elf_sort_elf_symbol
);
6884 if (indbufend
> indbuf
)
6885 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
6886 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
6889 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
6890 + (indbufend
- indbuf
) * sizeof (*ssym
));
6891 ssymbuf
= bfd_malloc (total_size
);
6892 if (ssymbuf
== NULL
)
6898 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
6899 ssymbuf
->ssym
= NULL
;
6900 ssymbuf
->count
= shndx_count
;
6901 ssymbuf
->st_shndx
= 0;
6902 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
6904 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
6907 ssymhead
->ssym
= ssym
;
6908 ssymhead
->count
= 0;
6909 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
6911 ssym
->st_name
= (*ind
)->st_name
;
6912 ssym
->st_info
= (*ind
)->st_info
;
6913 ssym
->st_other
= (*ind
)->st_other
;
6916 BFD_ASSERT ((bfd_size_type
) (ssymhead
- ssymbuf
) == shndx_count
6917 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
6924 /* Check if 2 sections define the same set of local and global
6928 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
6929 struct bfd_link_info
*info
)
6932 const struct elf_backend_data
*bed1
, *bed2
;
6933 Elf_Internal_Shdr
*hdr1
, *hdr2
;
6934 bfd_size_type symcount1
, symcount2
;
6935 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
6936 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
6937 Elf_Internal_Sym
*isym
, *isymend
;
6938 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
6939 bfd_size_type count1
, count2
, i
;
6940 unsigned int shndx1
, shndx2
;
6946 /* Both sections have to be in ELF. */
6947 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
6948 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
6951 if (elf_section_type (sec1
) != elf_section_type (sec2
))
6954 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
6955 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
6956 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
6959 bed1
= get_elf_backend_data (bfd1
);
6960 bed2
= get_elf_backend_data (bfd2
);
6961 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
6962 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
6963 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
6964 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
6966 if (symcount1
== 0 || symcount2
== 0)
6972 ssymbuf1
= elf_tdata (bfd1
)->symbuf
;
6973 ssymbuf2
= elf_tdata (bfd2
)->symbuf
;
6975 if (ssymbuf1
== NULL
)
6977 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
6979 if (isymbuf1
== NULL
)
6982 if (!info
->reduce_memory_overheads
)
6983 elf_tdata (bfd1
)->symbuf
= ssymbuf1
6984 = elf_create_symbuf (symcount1
, isymbuf1
);
6987 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
6989 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
6991 if (isymbuf2
== NULL
)
6994 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
6995 elf_tdata (bfd2
)->symbuf
= ssymbuf2
6996 = elf_create_symbuf (symcount2
, isymbuf2
);
6999 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7001 /* Optimized faster version. */
7002 bfd_size_type lo
, hi
, mid
;
7003 struct elf_symbol
*symp
;
7004 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7007 hi
= ssymbuf1
->count
;
7012 mid
= (lo
+ hi
) / 2;
7013 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7015 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7019 count1
= ssymbuf1
[mid
].count
;
7026 hi
= ssymbuf2
->count
;
7031 mid
= (lo
+ hi
) / 2;
7032 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7034 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7038 count2
= ssymbuf2
[mid
].count
;
7044 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7047 symtable1
= bfd_malloc (count1
* sizeof (struct elf_symbol
));
7048 symtable2
= bfd_malloc (count2
* sizeof (struct elf_symbol
));
7049 if (symtable1
== NULL
|| symtable2
== NULL
)
7053 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7054 ssym
< ssymend
; ssym
++, symp
++)
7056 symp
->u
.ssym
= ssym
;
7057 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7063 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7064 ssym
< ssymend
; ssym
++, symp
++)
7066 symp
->u
.ssym
= ssym
;
7067 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7072 /* Sort symbol by name. */
7073 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7074 elf_sym_name_compare
);
7075 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7076 elf_sym_name_compare
);
7078 for (i
= 0; i
< count1
; i
++)
7079 /* Two symbols must have the same binding, type and name. */
7080 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7081 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7082 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7089 symtable1
= bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7090 symtable2
= bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7091 if (symtable1
== NULL
|| symtable2
== NULL
)
7094 /* Count definitions in the section. */
7096 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7097 if (isym
->st_shndx
== shndx1
)
7098 symtable1
[count1
++].u
.isym
= isym
;
7101 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7102 if (isym
->st_shndx
== shndx2
)
7103 symtable2
[count2
++].u
.isym
= isym
;
7105 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7108 for (i
= 0; i
< count1
; i
++)
7110 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7111 symtable1
[i
].u
.isym
->st_name
);
7113 for (i
= 0; i
< count2
; i
++)
7115 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7116 symtable2
[i
].u
.isym
->st_name
);
7118 /* Sort symbol by name. */
7119 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7120 elf_sym_name_compare
);
7121 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7122 elf_sym_name_compare
);
7124 for (i
= 0; i
< count1
; i
++)
7125 /* Two symbols must have the same binding, type and name. */
7126 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7127 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7128 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7146 /* Return TRUE if 2 section types are compatible. */
7149 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7150 bfd
*bbfd
, const asection
*bsec
)
7154 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7155 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7158 return elf_section_type (asec
) == elf_section_type (bsec
);
7161 /* Final phase of ELF linker. */
7163 /* A structure we use to avoid passing large numbers of arguments. */
7165 struct elf_final_link_info
7167 /* General link information. */
7168 struct bfd_link_info
*info
;
7171 /* Symbol string table. */
7172 struct bfd_strtab_hash
*symstrtab
;
7173 /* .dynsym section. */
7174 asection
*dynsym_sec
;
7175 /* .hash section. */
7177 /* symbol version section (.gnu.version). */
7178 asection
*symver_sec
;
7179 /* Buffer large enough to hold contents of any section. */
7181 /* Buffer large enough to hold external relocs of any section. */
7182 void *external_relocs
;
7183 /* Buffer large enough to hold internal relocs of any section. */
7184 Elf_Internal_Rela
*internal_relocs
;
7185 /* Buffer large enough to hold external local symbols of any input
7187 bfd_byte
*external_syms
;
7188 /* And a buffer for symbol section indices. */
7189 Elf_External_Sym_Shndx
*locsym_shndx
;
7190 /* Buffer large enough to hold internal local symbols of any input
7192 Elf_Internal_Sym
*internal_syms
;
7193 /* Array large enough to hold a symbol index for each local symbol
7194 of any input BFD. */
7196 /* Array large enough to hold a section pointer for each local
7197 symbol of any input BFD. */
7198 asection
**sections
;
7199 /* Buffer to hold swapped out symbols. */
7201 /* And one for symbol section indices. */
7202 Elf_External_Sym_Shndx
*symshndxbuf
;
7203 /* Number of swapped out symbols in buffer. */
7204 size_t symbuf_count
;
7205 /* Number of symbols which fit in symbuf. */
7207 /* And same for symshndxbuf. */
7208 size_t shndxbuf_size
;
7211 /* This struct is used to pass information to elf_link_output_extsym. */
7213 struct elf_outext_info
7216 bfd_boolean localsyms
;
7217 struct elf_final_link_info
*finfo
;
7221 /* Support for evaluating a complex relocation.
7223 Complex relocations are generalized, self-describing relocations. The
7224 implementation of them consists of two parts: complex symbols, and the
7225 relocations themselves.
7227 The relocations are use a reserved elf-wide relocation type code (R_RELC
7228 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7229 information (start bit, end bit, word width, etc) into the addend. This
7230 information is extracted from CGEN-generated operand tables within gas.
7232 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7233 internal) representing prefix-notation expressions, including but not
7234 limited to those sorts of expressions normally encoded as addends in the
7235 addend field. The symbol mangling format is:
7238 | <unary-operator> ':' <node>
7239 | <binary-operator> ':' <node> ':' <node>
7242 <literal> := 's' <digits=N> ':' <N character symbol name>
7243 | 'S' <digits=N> ':' <N character section name>
7247 <binary-operator> := as in C
7248 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7251 set_symbol_value (bfd
*bfd_with_globals
,
7252 Elf_Internal_Sym
*isymbuf
,
7257 struct elf_link_hash_entry
**sym_hashes
;
7258 struct elf_link_hash_entry
*h
;
7259 size_t extsymoff
= locsymcount
;
7261 if (symidx
< locsymcount
)
7263 Elf_Internal_Sym
*sym
;
7265 sym
= isymbuf
+ symidx
;
7266 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7268 /* It is a local symbol: move it to the
7269 "absolute" section and give it a value. */
7270 sym
->st_shndx
= SHN_ABS
;
7271 sym
->st_value
= val
;
7274 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7278 /* It is a global symbol: set its link type
7279 to "defined" and give it a value. */
7281 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7282 h
= sym_hashes
[symidx
- extsymoff
];
7283 while (h
->root
.type
== bfd_link_hash_indirect
7284 || h
->root
.type
== bfd_link_hash_warning
)
7285 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7286 h
->root
.type
= bfd_link_hash_defined
;
7287 h
->root
.u
.def
.value
= val
;
7288 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7292 resolve_symbol (const char *name
,
7294 struct elf_final_link_info
*finfo
,
7296 Elf_Internal_Sym
*isymbuf
,
7299 Elf_Internal_Sym
*sym
;
7300 struct bfd_link_hash_entry
*global_entry
;
7301 const char *candidate
= NULL
;
7302 Elf_Internal_Shdr
*symtab_hdr
;
7305 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7307 for (i
= 0; i
< locsymcount
; ++ i
)
7311 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7314 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7315 symtab_hdr
->sh_link
,
7318 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7319 name
, candidate
, (unsigned long) sym
->st_value
);
7321 if (candidate
&& strcmp (candidate
, name
) == 0)
7323 asection
*sec
= finfo
->sections
[i
];
7325 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7326 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7328 printf ("Found symbol with value %8.8lx\n",
7329 (unsigned long) *result
);
7335 /* Hmm, haven't found it yet. perhaps it is a global. */
7336 global_entry
= bfd_link_hash_lookup (finfo
->info
->hash
, name
,
7337 FALSE
, FALSE
, TRUE
);
7341 if (global_entry
->type
== bfd_link_hash_defined
7342 || global_entry
->type
== bfd_link_hash_defweak
)
7344 *result
= (global_entry
->u
.def
.value
7345 + global_entry
->u
.def
.section
->output_section
->vma
7346 + global_entry
->u
.def
.section
->output_offset
);
7348 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7349 global_entry
->root
.string
, (unsigned long) *result
);
7358 resolve_section (const char *name
,
7365 for (curr
= sections
; curr
; curr
= curr
->next
)
7366 if (strcmp (curr
->name
, name
) == 0)
7368 *result
= curr
->vma
;
7372 /* Hmm. still haven't found it. try pseudo-section names. */
7373 for (curr
= sections
; curr
; curr
= curr
->next
)
7375 len
= strlen (curr
->name
);
7376 if (len
> strlen (name
))
7379 if (strncmp (curr
->name
, name
, len
) == 0)
7381 if (strncmp (".end", name
+ len
, 4) == 0)
7383 *result
= curr
->vma
+ curr
->size
;
7387 /* Insert more pseudo-section names here, if you like. */
7395 undefined_reference (const char *reftype
, const char *name
)
7397 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7402 eval_symbol (bfd_vma
*result
,
7405 struct elf_final_link_info
*finfo
,
7407 Elf_Internal_Sym
*isymbuf
,
7416 const char *sym
= *symp
;
7418 bfd_boolean symbol_is_section
= FALSE
;
7423 if (len
< 1 || len
> sizeof (symbuf
))
7425 bfd_set_error (bfd_error_invalid_operation
);
7438 *result
= strtoul (sym
, (char **) symp
, 16);
7442 symbol_is_section
= TRUE
;
7445 symlen
= strtol (sym
, (char **) symp
, 10);
7446 sym
= *symp
+ 1; /* Skip the trailing ':'. */
7448 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
7450 bfd_set_error (bfd_error_invalid_operation
);
7454 memcpy (symbuf
, sym
, symlen
);
7455 symbuf
[symlen
] = '\0';
7456 *symp
= sym
+ symlen
;
7458 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7459 the symbol as a section, or vice-versa. so we're pretty liberal in our
7460 interpretation here; section means "try section first", not "must be a
7461 section", and likewise with symbol. */
7463 if (symbol_is_section
)
7465 if (!resolve_section (symbuf
, finfo
->output_bfd
->sections
, result
)
7466 && !resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7467 isymbuf
, locsymcount
))
7469 undefined_reference ("section", symbuf
);
7475 if (!resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7476 isymbuf
, locsymcount
)
7477 && !resolve_section (symbuf
, finfo
->output_bfd
->sections
,
7480 undefined_reference ("symbol", symbuf
);
7487 /* All that remains are operators. */
7489 #define UNARY_OP(op) \
7490 if (strncmp (sym, #op, strlen (#op)) == 0) \
7492 sym += strlen (#op); \
7496 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7497 isymbuf, locsymcount, signed_p)) \
7500 *result = op ((bfd_signed_vma) a); \
7506 #define BINARY_OP(op) \
7507 if (strncmp (sym, #op, strlen (#op)) == 0) \
7509 sym += strlen (#op); \
7513 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7514 isymbuf, locsymcount, signed_p)) \
7517 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7518 isymbuf, locsymcount, signed_p)) \
7521 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7551 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
7552 bfd_set_error (bfd_error_invalid_operation
);
7558 put_value (bfd_vma size
,
7559 unsigned long chunksz
,
7564 location
+= (size
- chunksz
);
7566 for (; size
; size
-= chunksz
, location
-= chunksz
, x
>>= (chunksz
* 8))
7574 bfd_put_8 (input_bfd
, x
, location
);
7577 bfd_put_16 (input_bfd
, x
, location
);
7580 bfd_put_32 (input_bfd
, x
, location
);
7584 bfd_put_64 (input_bfd
, x
, location
);
7594 get_value (bfd_vma size
,
7595 unsigned long chunksz
,
7601 for (; size
; size
-= chunksz
, location
+= chunksz
)
7609 x
= (x
<< (8 * chunksz
)) | bfd_get_8 (input_bfd
, location
);
7612 x
= (x
<< (8 * chunksz
)) | bfd_get_16 (input_bfd
, location
);
7615 x
= (x
<< (8 * chunksz
)) | bfd_get_32 (input_bfd
, location
);
7619 x
= (x
<< (8 * chunksz
)) | bfd_get_64 (input_bfd
, location
);
7630 decode_complex_addend (unsigned long *start
, /* in bits */
7631 unsigned long *oplen
, /* in bits */
7632 unsigned long *len
, /* in bits */
7633 unsigned long *wordsz
, /* in bytes */
7634 unsigned long *chunksz
, /* in bytes */
7635 unsigned long *lsb0_p
,
7636 unsigned long *signed_p
,
7637 unsigned long *trunc_p
,
7638 unsigned long encoded
)
7640 * start
= encoded
& 0x3F;
7641 * len
= (encoded
>> 6) & 0x3F;
7642 * oplen
= (encoded
>> 12) & 0x3F;
7643 * wordsz
= (encoded
>> 18) & 0xF;
7644 * chunksz
= (encoded
>> 22) & 0xF;
7645 * lsb0_p
= (encoded
>> 27) & 1;
7646 * signed_p
= (encoded
>> 28) & 1;
7647 * trunc_p
= (encoded
>> 29) & 1;
7650 bfd_reloc_status_type
7651 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
7652 asection
*input_section ATTRIBUTE_UNUSED
,
7654 Elf_Internal_Rela
*rel
,
7657 bfd_vma shift
, x
, mask
;
7658 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
7659 bfd_reloc_status_type r
;
7661 /* Perform this reloc, since it is complex.
7662 (this is not to say that it necessarily refers to a complex
7663 symbol; merely that it is a self-describing CGEN based reloc.
7664 i.e. the addend has the complete reloc information (bit start, end,
7665 word size, etc) encoded within it.). */
7667 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
7668 &chunksz
, &lsb0_p
, &signed_p
,
7669 &trunc_p
, rel
->r_addend
);
7671 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
7674 shift
= (start
+ 1) - len
;
7676 shift
= (8 * wordsz
) - (start
+ len
);
7678 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ rel
->r_offset
);
7681 printf ("Doing complex reloc: "
7682 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7683 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7684 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7685 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
7686 oplen
, x
, mask
, relocation
);
7691 /* Now do an overflow check. */
7692 r
= bfd_check_overflow ((signed_p
7693 ? complain_overflow_signed
7694 : complain_overflow_unsigned
),
7695 len
, 0, (8 * wordsz
),
7699 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
7702 printf (" relocation: %8.8lx\n"
7703 " shifted mask: %8.8lx\n"
7704 " shifted/masked reloc: %8.8lx\n"
7705 " result: %8.8lx\n",
7706 relocation
, (mask
<< shift
),
7707 ((relocation
& mask
) << shift
), x
);
7709 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ rel
->r_offset
);
7713 /* When performing a relocatable link, the input relocations are
7714 preserved. But, if they reference global symbols, the indices
7715 referenced must be updated. Update all the relocations in
7716 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
7719 elf_link_adjust_relocs (bfd
*abfd
,
7720 Elf_Internal_Shdr
*rel_hdr
,
7722 struct elf_link_hash_entry
**rel_hash
)
7725 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7727 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7728 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7729 bfd_vma r_type_mask
;
7732 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
7734 swap_in
= bed
->s
->swap_reloc_in
;
7735 swap_out
= bed
->s
->swap_reloc_out
;
7737 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
7739 swap_in
= bed
->s
->swap_reloca_in
;
7740 swap_out
= bed
->s
->swap_reloca_out
;
7745 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
7748 if (bed
->s
->arch_size
== 32)
7755 r_type_mask
= 0xffffffff;
7759 erela
= rel_hdr
->contents
;
7760 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
7762 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
7765 if (*rel_hash
== NULL
)
7768 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
7770 (*swap_in
) (abfd
, erela
, irela
);
7771 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
7772 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
7773 | (irela
[j
].r_info
& r_type_mask
));
7774 (*swap_out
) (abfd
, irela
, erela
);
7778 struct elf_link_sort_rela
7784 enum elf_reloc_type_class type
;
7785 /* We use this as an array of size int_rels_per_ext_rel. */
7786 Elf_Internal_Rela rela
[1];
7790 elf_link_sort_cmp1 (const void *A
, const void *B
)
7792 const struct elf_link_sort_rela
*a
= A
;
7793 const struct elf_link_sort_rela
*b
= B
;
7794 int relativea
, relativeb
;
7796 relativea
= a
->type
== reloc_class_relative
;
7797 relativeb
= b
->type
== reloc_class_relative
;
7799 if (relativea
< relativeb
)
7801 if (relativea
> relativeb
)
7803 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
7805 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
7807 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
7809 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
7815 elf_link_sort_cmp2 (const void *A
, const void *B
)
7817 const struct elf_link_sort_rela
*a
= A
;
7818 const struct elf_link_sort_rela
*b
= B
;
7821 if (a
->u
.offset
< b
->u
.offset
)
7823 if (a
->u
.offset
> b
->u
.offset
)
7825 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
7826 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
7831 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
7833 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
7839 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
7841 asection
*dynamic_relocs
;
7844 bfd_size_type count
, size
;
7845 size_t i
, ret
, sort_elt
, ext_size
;
7846 bfd_byte
*sort
, *s_non_relative
, *p
;
7847 struct elf_link_sort_rela
*sq
;
7848 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7849 int i2e
= bed
->s
->int_rels_per_ext_rel
;
7850 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7851 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7852 struct bfd_link_order
*lo
;
7854 bfd_boolean use_rela
;
7856 /* Find a dynamic reloc section. */
7857 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
7858 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
7859 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
7860 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
7862 bfd_boolean use_rela_initialised
= FALSE
;
7864 /* This is just here to stop gcc from complaining.
7865 It's initialization checking code is not perfect. */
7868 /* Both sections are present. Examine the sizes
7869 of the indirect sections to help us choose. */
7870 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
7871 if (lo
->type
== bfd_indirect_link_order
)
7873 asection
*o
= lo
->u
.indirect
.section
;
7875 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
7877 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
7878 /* Section size is divisible by both rel and rela sizes.
7879 It is of no help to us. */
7883 /* Section size is only divisible by rela. */
7884 if (use_rela_initialised
&& (use_rela
== FALSE
))
7887 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
7888 bfd_set_error (bfd_error_invalid_operation
);
7894 use_rela_initialised
= TRUE
;
7898 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
7900 /* Section size is only divisible by rel. */
7901 if (use_rela_initialised
&& (use_rela
== TRUE
))
7904 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
7905 bfd_set_error (bfd_error_invalid_operation
);
7911 use_rela_initialised
= TRUE
;
7916 /* The section size is not divisible by either - something is wrong. */
7918 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
7919 bfd_set_error (bfd_error_invalid_operation
);
7924 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
7925 if (lo
->type
== bfd_indirect_link_order
)
7927 asection
*o
= lo
->u
.indirect
.section
;
7929 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
7931 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
7932 /* Section size is divisible by both rel and rela sizes.
7933 It is of no help to us. */
7937 /* Section size is only divisible by rela. */
7938 if (use_rela_initialised
&& (use_rela
== FALSE
))
7941 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
7942 bfd_set_error (bfd_error_invalid_operation
);
7948 use_rela_initialised
= TRUE
;
7952 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
7954 /* Section size is only divisible by rel. */
7955 if (use_rela_initialised
&& (use_rela
== TRUE
))
7958 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
7959 bfd_set_error (bfd_error_invalid_operation
);
7965 use_rela_initialised
= TRUE
;
7970 /* The section size is not divisible by either - something is wrong. */
7972 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
7973 bfd_set_error (bfd_error_invalid_operation
);
7978 if (! use_rela_initialised
)
7982 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
7984 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
7991 dynamic_relocs
= rela_dyn
;
7992 ext_size
= bed
->s
->sizeof_rela
;
7993 swap_in
= bed
->s
->swap_reloca_in
;
7994 swap_out
= bed
->s
->swap_reloca_out
;
7998 dynamic_relocs
= rel_dyn
;
7999 ext_size
= bed
->s
->sizeof_rel
;
8000 swap_in
= bed
->s
->swap_reloc_in
;
8001 swap_out
= bed
->s
->swap_reloc_out
;
8005 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8006 if (lo
->type
== bfd_indirect_link_order
)
8007 size
+= lo
->u
.indirect
.section
->size
;
8009 if (size
!= dynamic_relocs
->size
)
8012 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8013 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8015 count
= dynamic_relocs
->size
/ ext_size
;
8016 sort
= bfd_zmalloc (sort_elt
* count
);
8020 (*info
->callbacks
->warning
)
8021 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8025 if (bed
->s
->arch_size
== 32)
8026 r_sym_mask
= ~(bfd_vma
) 0xff;
8028 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8030 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8031 if (lo
->type
== bfd_indirect_link_order
)
8033 bfd_byte
*erel
, *erelend
;
8034 asection
*o
= lo
->u
.indirect
.section
;
8036 if (o
->contents
== NULL
&& o
->size
!= 0)
8038 /* This is a reloc section that is being handled as a normal
8039 section. See bfd_section_from_shdr. We can't combine
8040 relocs in this case. */
8045 erelend
= o
->contents
+ o
->size
;
8046 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8048 while (erel
< erelend
)
8050 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8052 (*swap_in
) (abfd
, erel
, s
->rela
);
8053 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
8054 s
->u
.sym_mask
= r_sym_mask
;
8060 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8062 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8064 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8065 if (s
->type
!= reloc_class_relative
)
8071 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8072 for (; i
< count
; i
++, p
+= sort_elt
)
8074 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8075 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8077 sp
->u
.offset
= sq
->rela
->r_offset
;
8080 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8082 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8083 if (lo
->type
== bfd_indirect_link_order
)
8085 bfd_byte
*erel
, *erelend
;
8086 asection
*o
= lo
->u
.indirect
.section
;
8089 erelend
= o
->contents
+ o
->size
;
8090 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8091 while (erel
< erelend
)
8093 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8094 (*swap_out
) (abfd
, s
->rela
, erel
);
8101 *psec
= dynamic_relocs
;
8105 /* Flush the output symbols to the file. */
8108 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
8109 const struct elf_backend_data
*bed
)
8111 if (finfo
->symbuf_count
> 0)
8113 Elf_Internal_Shdr
*hdr
;
8117 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
8118 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
8119 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8120 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
8121 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
8124 hdr
->sh_size
+= amt
;
8125 finfo
->symbuf_count
= 0;
8131 /* Add a symbol to the output symbol table. */
8134 elf_link_output_sym (struct elf_final_link_info
*finfo
,
8136 Elf_Internal_Sym
*elfsym
,
8137 asection
*input_sec
,
8138 struct elf_link_hash_entry
*h
)
8141 Elf_External_Sym_Shndx
*destshndx
;
8142 bfd_boolean (*output_symbol_hook
)
8143 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8144 struct elf_link_hash_entry
*);
8145 const struct elf_backend_data
*bed
;
8147 bed
= get_elf_backend_data (finfo
->output_bfd
);
8148 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8149 if (output_symbol_hook
!= NULL
)
8151 if (! (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
))
8155 if (name
== NULL
|| *name
== '\0')
8156 elfsym
->st_name
= 0;
8157 else if (input_sec
->flags
& SEC_EXCLUDE
)
8158 elfsym
->st_name
= 0;
8161 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
8163 if (elfsym
->st_name
== (unsigned long) -1)
8167 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
8169 if (! elf_link_flush_output_syms (finfo
, bed
))
8173 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8174 destshndx
= finfo
->symshndxbuf
;
8175 if (destshndx
!= NULL
)
8177 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
8181 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
8182 destshndx
= bfd_realloc (destshndx
, amt
* 2);
8183 if (destshndx
== NULL
)
8185 finfo
->symshndxbuf
= destshndx
;
8186 memset ((char *) destshndx
+ amt
, 0, amt
);
8187 finfo
->shndxbuf_size
*= 2;
8189 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
8192 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
8193 finfo
->symbuf_count
+= 1;
8194 bfd_get_symcount (finfo
->output_bfd
) += 1;
8199 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8202 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
8204 if (sym
->st_shndx
> SHN_HIRESERVE
)
8206 /* The gABI doesn't support dynamic symbols in output sections
8208 (*_bfd_error_handler
)
8209 (_("%B: Too many sections: %d (>= %d)"),
8210 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
);
8211 bfd_set_error (bfd_error_nonrepresentable_section
);
8217 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8218 allowing an unsatisfied unversioned symbol in the DSO to match a
8219 versioned symbol that would normally require an explicit version.
8220 We also handle the case that a DSO references a hidden symbol
8221 which may be satisfied by a versioned symbol in another DSO. */
8224 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
8225 const struct elf_backend_data
*bed
,
8226 struct elf_link_hash_entry
*h
)
8229 struct elf_link_loaded_list
*loaded
;
8231 if (!is_elf_hash_table (info
->hash
))
8234 switch (h
->root
.type
)
8240 case bfd_link_hash_undefined
:
8241 case bfd_link_hash_undefweak
:
8242 abfd
= h
->root
.u
.undef
.abfd
;
8243 if ((abfd
->flags
& DYNAMIC
) == 0
8244 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
8248 case bfd_link_hash_defined
:
8249 case bfd_link_hash_defweak
:
8250 abfd
= h
->root
.u
.def
.section
->owner
;
8253 case bfd_link_hash_common
:
8254 abfd
= h
->root
.u
.c
.p
->section
->owner
;
8257 BFD_ASSERT (abfd
!= NULL
);
8259 for (loaded
= elf_hash_table (info
)->loaded
;
8261 loaded
= loaded
->next
)
8264 Elf_Internal_Shdr
*hdr
;
8265 bfd_size_type symcount
;
8266 bfd_size_type extsymcount
;
8267 bfd_size_type extsymoff
;
8268 Elf_Internal_Shdr
*versymhdr
;
8269 Elf_Internal_Sym
*isym
;
8270 Elf_Internal_Sym
*isymend
;
8271 Elf_Internal_Sym
*isymbuf
;
8272 Elf_External_Versym
*ever
;
8273 Elf_External_Versym
*extversym
;
8275 input
= loaded
->abfd
;
8277 /* We check each DSO for a possible hidden versioned definition. */
8279 || (input
->flags
& DYNAMIC
) == 0
8280 || elf_dynversym (input
) == 0)
8283 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
8285 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8286 if (elf_bad_symtab (input
))
8288 extsymcount
= symcount
;
8293 extsymcount
= symcount
- hdr
->sh_info
;
8294 extsymoff
= hdr
->sh_info
;
8297 if (extsymcount
== 0)
8300 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
8302 if (isymbuf
== NULL
)
8305 /* Read in any version definitions. */
8306 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
8307 extversym
= bfd_malloc (versymhdr
->sh_size
);
8308 if (extversym
== NULL
)
8311 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
8312 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
8313 != versymhdr
->sh_size
))
8321 ever
= extversym
+ extsymoff
;
8322 isymend
= isymbuf
+ extsymcount
;
8323 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
8326 Elf_Internal_Versym iver
;
8327 unsigned short version_index
;
8329 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
8330 || isym
->st_shndx
== SHN_UNDEF
)
8333 name
= bfd_elf_string_from_elf_section (input
,
8336 if (strcmp (name
, h
->root
.root
.string
) != 0)
8339 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
8341 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
8343 /* If we have a non-hidden versioned sym, then it should
8344 have provided a definition for the undefined sym. */
8348 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
8349 if (version_index
== 1 || version_index
== 2)
8351 /* This is the base or first version. We can use it. */
8365 /* Add an external symbol to the symbol table. This is called from
8366 the hash table traversal routine. When generating a shared object,
8367 we go through the symbol table twice. The first time we output
8368 anything that might have been forced to local scope in a version
8369 script. The second time we output the symbols that are still
8373 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
8375 struct elf_outext_info
*eoinfo
= data
;
8376 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
8378 Elf_Internal_Sym sym
;
8379 asection
*input_sec
;
8380 const struct elf_backend_data
*bed
;
8382 if (h
->root
.type
== bfd_link_hash_warning
)
8384 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8385 if (h
->root
.type
== bfd_link_hash_new
)
8389 /* Decide whether to output this symbol in this pass. */
8390 if (eoinfo
->localsyms
)
8392 if (!h
->forced_local
)
8397 if (h
->forced_local
)
8401 bed
= get_elf_backend_data (finfo
->output_bfd
);
8403 if (h
->root
.type
== bfd_link_hash_undefined
)
8405 /* If we have an undefined symbol reference here then it must have
8406 come from a shared library that is being linked in. (Undefined
8407 references in regular files have already been handled). */
8408 bfd_boolean ignore_undef
= FALSE
;
8410 /* Some symbols may be special in that the fact that they're
8411 undefined can be safely ignored - let backend determine that. */
8412 if (bed
->elf_backend_ignore_undef_symbol
)
8413 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
8415 /* If we are reporting errors for this situation then do so now. */
8416 if (ignore_undef
== FALSE
8419 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
8420 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
8422 if (! (finfo
->info
->callbacks
->undefined_symbol
8423 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
8424 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
8426 eoinfo
->failed
= TRUE
;
8432 /* We should also warn if a forced local symbol is referenced from
8433 shared libraries. */
8434 if (! finfo
->info
->relocatable
8435 && (! finfo
->info
->shared
)
8440 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
8442 (*_bfd_error_handler
)
8443 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
8445 h
->root
.u
.def
.section
== bfd_abs_section_ptr
8446 ? finfo
->output_bfd
: h
->root
.u
.def
.section
->owner
,
8447 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
8449 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
8450 ? "hidden" : "local",
8451 h
->root
.root
.string
);
8452 eoinfo
->failed
= TRUE
;
8456 /* We don't want to output symbols that have never been mentioned by
8457 a regular file, or that we have been told to strip. However, if
8458 h->indx is set to -2, the symbol is used by a reloc and we must
8462 else if ((h
->def_dynamic
8464 || h
->root
.type
== bfd_link_hash_new
)
8468 else if (finfo
->info
->strip
== strip_all
)
8470 else if (finfo
->info
->strip
== strip_some
8471 && bfd_hash_lookup (finfo
->info
->keep_hash
,
8472 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
8474 else if (finfo
->info
->strip_discarded
8475 && (h
->root
.type
== bfd_link_hash_defined
8476 || h
->root
.type
== bfd_link_hash_defweak
)
8477 && elf_discarded_section (h
->root
.u
.def
.section
))
8482 /* If we're stripping it, and it's not a dynamic symbol, there's
8483 nothing else to do unless it is a forced local symbol. */
8486 && !h
->forced_local
)
8490 sym
.st_size
= h
->size
;
8491 sym
.st_other
= h
->other
;
8492 if (h
->forced_local
)
8493 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
8494 else if (h
->root
.type
== bfd_link_hash_undefweak
8495 || h
->root
.type
== bfd_link_hash_defweak
)
8496 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
8498 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
8500 switch (h
->root
.type
)
8503 case bfd_link_hash_new
:
8504 case bfd_link_hash_warning
:
8508 case bfd_link_hash_undefined
:
8509 case bfd_link_hash_undefweak
:
8510 input_sec
= bfd_und_section_ptr
;
8511 sym
.st_shndx
= SHN_UNDEF
;
8514 case bfd_link_hash_defined
:
8515 case bfd_link_hash_defweak
:
8517 input_sec
= h
->root
.u
.def
.section
;
8518 if (input_sec
->output_section
!= NULL
)
8521 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
8522 input_sec
->output_section
);
8523 if (sym
.st_shndx
== SHN_BAD
)
8525 (*_bfd_error_handler
)
8526 (_("%B: could not find output section %A for input section %A"),
8527 finfo
->output_bfd
, input_sec
->output_section
, input_sec
);
8528 eoinfo
->failed
= TRUE
;
8532 /* ELF symbols in relocatable files are section relative,
8533 but in nonrelocatable files they are virtual
8535 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
8536 if (! finfo
->info
->relocatable
)
8538 sym
.st_value
+= input_sec
->output_section
->vma
;
8539 if (h
->type
== STT_TLS
)
8541 asection
*tls_sec
= elf_hash_table (finfo
->info
)->tls_sec
;
8542 if (tls_sec
!= NULL
)
8543 sym
.st_value
-= tls_sec
->vma
;
8546 /* The TLS section may have been garbage collected. */
8547 BFD_ASSERT (finfo
->info
->gc_sections
8548 && !input_sec
->gc_mark
);
8555 BFD_ASSERT (input_sec
->owner
== NULL
8556 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
8557 sym
.st_shndx
= SHN_UNDEF
;
8558 input_sec
= bfd_und_section_ptr
;
8563 case bfd_link_hash_common
:
8564 input_sec
= h
->root
.u
.c
.p
->section
;
8565 sym
.st_shndx
= bed
->common_section_index (input_sec
);
8566 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
8569 case bfd_link_hash_indirect
:
8570 /* These symbols are created by symbol versioning. They point
8571 to the decorated version of the name. For example, if the
8572 symbol foo@@GNU_1.2 is the default, which should be used when
8573 foo is used with no version, then we add an indirect symbol
8574 foo which points to foo@@GNU_1.2. We ignore these symbols,
8575 since the indirected symbol is already in the hash table. */
8579 /* Give the processor backend a chance to tweak the symbol value,
8580 and also to finish up anything that needs to be done for this
8581 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8582 forced local syms when non-shared is due to a historical quirk. */
8583 if ((h
->dynindx
!= -1
8585 && ((finfo
->info
->shared
8586 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
8587 || h
->root
.type
!= bfd_link_hash_undefweak
))
8588 || !h
->forced_local
)
8589 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8591 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
8592 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
8594 eoinfo
->failed
= TRUE
;
8599 /* If we are marking the symbol as undefined, and there are no
8600 non-weak references to this symbol from a regular object, then
8601 mark the symbol as weak undefined; if there are non-weak
8602 references, mark the symbol as strong. We can't do this earlier,
8603 because it might not be marked as undefined until the
8604 finish_dynamic_symbol routine gets through with it. */
8605 if (sym
.st_shndx
== SHN_UNDEF
8607 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
8608 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
8612 if (h
->ref_regular_nonweak
)
8613 bindtype
= STB_GLOBAL
;
8615 bindtype
= STB_WEAK
;
8616 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
8619 /* If a non-weak symbol with non-default visibility is not defined
8620 locally, it is a fatal error. */
8621 if (! finfo
->info
->relocatable
8622 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
8623 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
8624 && h
->root
.type
== bfd_link_hash_undefined
8627 (*_bfd_error_handler
)
8628 (_("%B: %s symbol `%s' isn't defined"),
8630 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
8632 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
8633 ? "internal" : "hidden",
8634 h
->root
.root
.string
);
8635 eoinfo
->failed
= TRUE
;
8639 /* If this symbol should be put in the .dynsym section, then put it
8640 there now. We already know the symbol index. We also fill in
8641 the entry in the .hash section. */
8642 if (h
->dynindx
!= -1
8643 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8647 sym
.st_name
= h
->dynstr_index
;
8648 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
8649 if (! check_dynsym (finfo
->output_bfd
, &sym
))
8651 eoinfo
->failed
= TRUE
;
8654 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
8656 if (finfo
->hash_sec
!= NULL
)
8658 size_t hash_entry_size
;
8659 bfd_byte
*bucketpos
;
8664 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
8665 bucket
= h
->u
.elf_hash_value
% bucketcount
;
8668 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
8669 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
8670 + (bucket
+ 2) * hash_entry_size
);
8671 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
8672 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
8673 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
8674 ((bfd_byte
*) finfo
->hash_sec
->contents
8675 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
8678 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
8680 Elf_Internal_Versym iversym
;
8681 Elf_External_Versym
*eversym
;
8683 if (!h
->def_regular
)
8685 if (h
->verinfo
.verdef
== NULL
)
8686 iversym
.vs_vers
= 0;
8688 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
8692 if (h
->verinfo
.vertree
== NULL
)
8693 iversym
.vs_vers
= 1;
8695 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
8696 if (finfo
->info
->create_default_symver
)
8701 iversym
.vs_vers
|= VERSYM_HIDDEN
;
8703 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
8704 eversym
+= h
->dynindx
;
8705 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
8709 /* If we're stripping it, then it was just a dynamic symbol, and
8710 there's nothing else to do. */
8711 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
8714 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
8716 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
))
8718 eoinfo
->failed
= TRUE
;
8725 /* Return TRUE if special handling is done for relocs in SEC against
8726 symbols defined in discarded sections. */
8729 elf_section_ignore_discarded_relocs (asection
*sec
)
8731 const struct elf_backend_data
*bed
;
8733 switch (sec
->sec_info_type
)
8735 case ELF_INFO_TYPE_STABS
:
8736 case ELF_INFO_TYPE_EH_FRAME
:
8742 bed
= get_elf_backend_data (sec
->owner
);
8743 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8744 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
8750 /* Return a mask saying how ld should treat relocations in SEC against
8751 symbols defined in discarded sections. If this function returns
8752 COMPLAIN set, ld will issue a warning message. If this function
8753 returns PRETEND set, and the discarded section was link-once and the
8754 same size as the kept link-once section, ld will pretend that the
8755 symbol was actually defined in the kept section. Otherwise ld will
8756 zero the reloc (at least that is the intent, but some cooperation by
8757 the target dependent code is needed, particularly for REL targets). */
8760 _bfd_elf_default_action_discarded (asection
*sec
)
8762 if (sec
->flags
& SEC_DEBUGGING
)
8765 if (strcmp (".eh_frame", sec
->name
) == 0)
8768 if (strcmp (".gcc_except_table", sec
->name
) == 0)
8771 return COMPLAIN
| PRETEND
;
8774 /* Find a match between a section and a member of a section group. */
8777 match_group_member (asection
*sec
, asection
*group
,
8778 struct bfd_link_info
*info
)
8780 asection
*first
= elf_next_in_group (group
);
8781 asection
*s
= first
;
8785 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
8788 s
= elf_next_in_group (s
);
8796 /* Check if the kept section of a discarded section SEC can be used
8797 to replace it. Return the replacement if it is OK. Otherwise return
8801 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
8805 kept
= sec
->kept_section
;
8808 if ((kept
->flags
& SEC_GROUP
) != 0)
8809 kept
= match_group_member (sec
, kept
, info
);
8811 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
8812 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
8814 sec
->kept_section
= kept
;
8819 /* Link an input file into the linker output file. This function
8820 handles all the sections and relocations of the input file at once.
8821 This is so that we only have to read the local symbols once, and
8822 don't have to keep them in memory. */
8825 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
8827 int (*relocate_section
)
8828 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
8829 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
8831 Elf_Internal_Shdr
*symtab_hdr
;
8834 Elf_Internal_Sym
*isymbuf
;
8835 Elf_Internal_Sym
*isym
;
8836 Elf_Internal_Sym
*isymend
;
8838 asection
**ppsection
;
8840 const struct elf_backend_data
*bed
;
8841 struct elf_link_hash_entry
**sym_hashes
;
8843 output_bfd
= finfo
->output_bfd
;
8844 bed
= get_elf_backend_data (output_bfd
);
8845 relocate_section
= bed
->elf_backend_relocate_section
;
8847 /* If this is a dynamic object, we don't want to do anything here:
8848 we don't want the local symbols, and we don't want the section
8850 if ((input_bfd
->flags
& DYNAMIC
) != 0)
8853 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
8854 if (elf_bad_symtab (input_bfd
))
8856 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8861 locsymcount
= symtab_hdr
->sh_info
;
8862 extsymoff
= symtab_hdr
->sh_info
;
8865 /* Read the local symbols. */
8866 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8867 if (isymbuf
== NULL
&& locsymcount
!= 0)
8869 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
8870 finfo
->internal_syms
,
8871 finfo
->external_syms
,
8872 finfo
->locsym_shndx
);
8873 if (isymbuf
== NULL
)
8877 /* Find local symbol sections and adjust values of symbols in
8878 SEC_MERGE sections. Write out those local symbols we know are
8879 going into the output file. */
8880 isymend
= isymbuf
+ locsymcount
;
8881 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
8883 isym
++, pindex
++, ppsection
++)
8887 Elf_Internal_Sym osym
;
8891 if (elf_bad_symtab (input_bfd
))
8893 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
8900 if (isym
->st_shndx
== SHN_UNDEF
)
8901 isec
= bfd_und_section_ptr
;
8902 else if (isym
->st_shndx
== SHN_ABS
)
8903 isec
= bfd_abs_section_ptr
;
8904 else if (isym
->st_shndx
== SHN_COMMON
)
8905 isec
= bfd_com_section_ptr
;
8908 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
8911 /* Don't attempt to output symbols with st_shnx in the
8912 reserved range other than SHN_ABS and SHN_COMMON. */
8916 else if (isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
8917 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
8919 _bfd_merged_section_offset (output_bfd
, &isec
,
8920 elf_section_data (isec
)->sec_info
,
8926 /* Don't output the first, undefined, symbol. */
8927 if (ppsection
== finfo
->sections
)
8930 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
8932 /* We never output section symbols. Instead, we use the
8933 section symbol of the corresponding section in the output
8938 /* If we are stripping all symbols, we don't want to output this
8940 if (finfo
->info
->strip
== strip_all
)
8943 /* If we are discarding all local symbols, we don't want to
8944 output this one. If we are generating a relocatable output
8945 file, then some of the local symbols may be required by
8946 relocs; we output them below as we discover that they are
8948 if (finfo
->info
->discard
== discard_all
)
8951 /* If this symbol is defined in a section which we are
8952 discarding, we don't need to keep it. */
8953 if (isym
->st_shndx
!= SHN_UNDEF
8954 && (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
8956 || bfd_section_removed_from_list (output_bfd
,
8957 isec
->output_section
)))
8960 /* Get the name of the symbol. */
8961 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
8966 /* See if we are discarding symbols with this name. */
8967 if ((finfo
->info
->strip
== strip_some
8968 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
8970 || (((finfo
->info
->discard
== discard_sec_merge
8971 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
8972 || finfo
->info
->discard
== discard_l
)
8973 && bfd_is_local_label_name (input_bfd
, name
)))
8976 /* If we get here, we are going to output this symbol. */
8980 /* Adjust the section index for the output file. */
8981 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
8982 isec
->output_section
);
8983 if (osym
.st_shndx
== SHN_BAD
)
8986 *pindex
= bfd_get_symcount (output_bfd
);
8988 /* ELF symbols in relocatable files are section relative, but
8989 in executable files they are virtual addresses. Note that
8990 this code assumes that all ELF sections have an associated
8991 BFD section with a reasonable value for output_offset; below
8992 we assume that they also have a reasonable value for
8993 output_section. Any special sections must be set up to meet
8994 these requirements. */
8995 osym
.st_value
+= isec
->output_offset
;
8996 if (! finfo
->info
->relocatable
)
8998 osym
.st_value
+= isec
->output_section
->vma
;
8999 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
9001 /* STT_TLS symbols are relative to PT_TLS segment base. */
9002 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
9003 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
9007 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
))
9011 /* Relocate the contents of each section. */
9012 sym_hashes
= elf_sym_hashes (input_bfd
);
9013 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
9017 if (! o
->linker_mark
)
9019 /* This section was omitted from the link. */
9023 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
9024 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
9027 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
9029 /* Section was created by _bfd_elf_link_create_dynamic_sections
9034 /* Get the contents of the section. They have been cached by a
9035 relaxation routine. Note that o is a section in an input
9036 file, so the contents field will not have been set by any of
9037 the routines which work on output files. */
9038 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
9039 contents
= elf_section_data (o
)->this_hdr
.contents
;
9042 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
9044 contents
= finfo
->contents
;
9045 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
9049 if ((o
->flags
& SEC_RELOC
) != 0)
9051 Elf_Internal_Rela
*internal_relocs
;
9052 Elf_Internal_Rela
*rel
, *relend
;
9053 bfd_vma r_type_mask
;
9055 int action_discarded
;
9058 /* Get the swapped relocs. */
9060 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
9061 finfo
->internal_relocs
, FALSE
);
9062 if (internal_relocs
== NULL
9063 && o
->reloc_count
> 0)
9066 if (bed
->s
->arch_size
== 32)
9073 r_type_mask
= 0xffffffff;
9077 action_discarded
= -1;
9078 if (!elf_section_ignore_discarded_relocs (o
))
9079 action_discarded
= (*bed
->action_discarded
) (o
);
9081 /* Run through the relocs evaluating complex reloc symbols and
9082 looking for relocs against symbols from discarded sections
9083 or section symbols from removed link-once sections.
9084 Complain about relocs against discarded sections. Zero
9085 relocs against removed link-once sections. */
9087 rel
= internal_relocs
;
9088 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9089 for ( ; rel
< relend
; rel
++)
9091 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
9092 unsigned int s_type
;
9093 asection
**ps
, *sec
;
9094 struct elf_link_hash_entry
*h
= NULL
;
9095 const char *sym_name
;
9097 if (r_symndx
== STN_UNDEF
)
9100 if (r_symndx
>= locsymcount
9101 || (elf_bad_symtab (input_bfd
)
9102 && finfo
->sections
[r_symndx
] == NULL
))
9104 h
= sym_hashes
[r_symndx
- extsymoff
];
9106 /* Badly formatted input files can contain relocs that
9107 reference non-existant symbols. Check here so that
9108 we do not seg fault. */
9113 sprintf_vma (buffer
, rel
->r_info
);
9114 (*_bfd_error_handler
)
9115 (_("error: %B contains a reloc (0x%s) for section %A "
9116 "that references a non-existent global symbol"),
9117 input_bfd
, o
, buffer
);
9118 bfd_set_error (bfd_error_bad_value
);
9122 while (h
->root
.type
== bfd_link_hash_indirect
9123 || h
->root
.type
== bfd_link_hash_warning
)
9124 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9129 if (h
->root
.type
== bfd_link_hash_defined
9130 || h
->root
.type
== bfd_link_hash_defweak
)
9131 ps
= &h
->root
.u
.def
.section
;
9133 sym_name
= h
->root
.root
.string
;
9137 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
9139 s_type
= ELF_ST_TYPE (sym
->st_info
);
9140 ps
= &finfo
->sections
[r_symndx
];
9141 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
9145 if (s_type
== STT_RELC
|| s_type
== STT_SRELC
)
9148 bfd_vma dot
= (rel
->r_offset
9149 + o
->output_offset
+ o
->output_section
->vma
);
9151 printf ("Encountered a complex symbol!");
9152 printf (" (input_bfd %s, section %s, reloc %ld\n",
9153 input_bfd
->filename
, o
->name
, rel
- internal_relocs
);
9154 printf (" symbol: idx %8.8lx, name %s\n",
9155 r_symndx
, sym_name
);
9156 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9157 (unsigned long) rel
->r_info
,
9158 (unsigned long) rel
->r_offset
);
9160 if (!eval_symbol (&val
, &sym_name
, input_bfd
, finfo
, dot
,
9161 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
9164 /* Symbol evaluated OK. Update to absolute value. */
9165 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
9170 if (action_discarded
!= -1 && ps
!= NULL
)
9172 /* Complain if the definition comes from a
9173 discarded section. */
9174 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
9176 BFD_ASSERT (r_symndx
!= 0);
9177 if (action_discarded
& COMPLAIN
)
9178 (*finfo
->info
->callbacks
->einfo
)
9179 (_("%X`%s' referenced in section `%A' of %B: "
9180 "defined in discarded section `%A' of %B\n"),
9181 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
9183 /* Try to do the best we can to support buggy old
9184 versions of gcc. Pretend that the symbol is
9185 really defined in the kept linkonce section.
9186 FIXME: This is quite broken. Modifying the
9187 symbol here means we will be changing all later
9188 uses of the symbol, not just in this section. */
9189 if (action_discarded
& PRETEND
)
9193 kept
= _bfd_elf_check_kept_section (sec
,
9205 /* Relocate the section by invoking a back end routine.
9207 The back end routine is responsible for adjusting the
9208 section contents as necessary, and (if using Rela relocs
9209 and generating a relocatable output file) adjusting the
9210 reloc addend as necessary.
9212 The back end routine does not have to worry about setting
9213 the reloc address or the reloc symbol index.
9215 The back end routine is given a pointer to the swapped in
9216 internal symbols, and can access the hash table entries
9217 for the external symbols via elf_sym_hashes (input_bfd).
9219 When generating relocatable output, the back end routine
9220 must handle STB_LOCAL/STT_SECTION symbols specially. The
9221 output symbol is going to be a section symbol
9222 corresponding to the output section, which will require
9223 the addend to be adjusted. */
9225 ret
= (*relocate_section
) (output_bfd
, finfo
->info
,
9226 input_bfd
, o
, contents
,
9234 || finfo
->info
->relocatable
9235 || finfo
->info
->emitrelocations
)
9237 Elf_Internal_Rela
*irela
;
9238 Elf_Internal_Rela
*irelaend
;
9239 bfd_vma last_offset
;
9240 struct elf_link_hash_entry
**rel_hash
;
9241 struct elf_link_hash_entry
**rel_hash_list
;
9242 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
9243 unsigned int next_erel
;
9244 bfd_boolean rela_normal
;
9246 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
9247 rela_normal
= (bed
->rela_normal
9248 && (input_rel_hdr
->sh_entsize
9249 == bed
->s
->sizeof_rela
));
9251 /* Adjust the reloc addresses and symbol indices. */
9253 irela
= internal_relocs
;
9254 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9255 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
9256 + elf_section_data (o
->output_section
)->rel_count
9257 + elf_section_data (o
->output_section
)->rel_count2
);
9258 rel_hash_list
= rel_hash
;
9259 last_offset
= o
->output_offset
;
9260 if (!finfo
->info
->relocatable
)
9261 last_offset
+= o
->output_section
->vma
;
9262 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
9264 unsigned long r_symndx
;
9266 Elf_Internal_Sym sym
;
9268 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
9274 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
9277 if (irela
->r_offset
>= (bfd_vma
) -2)
9279 /* This is a reloc for a deleted entry or somesuch.
9280 Turn it into an R_*_NONE reloc, at the same
9281 offset as the last reloc. elf_eh_frame.c and
9282 bfd_elf_discard_info rely on reloc offsets
9284 irela
->r_offset
= last_offset
;
9286 irela
->r_addend
= 0;
9290 irela
->r_offset
+= o
->output_offset
;
9292 /* Relocs in an executable have to be virtual addresses. */
9293 if (!finfo
->info
->relocatable
)
9294 irela
->r_offset
+= o
->output_section
->vma
;
9296 last_offset
= irela
->r_offset
;
9298 r_symndx
= irela
->r_info
>> r_sym_shift
;
9299 if (r_symndx
== STN_UNDEF
)
9302 if (r_symndx
>= locsymcount
9303 || (elf_bad_symtab (input_bfd
)
9304 && finfo
->sections
[r_symndx
] == NULL
))
9306 struct elf_link_hash_entry
*rh
;
9309 /* This is a reloc against a global symbol. We
9310 have not yet output all the local symbols, so
9311 we do not know the symbol index of any global
9312 symbol. We set the rel_hash entry for this
9313 reloc to point to the global hash table entry
9314 for this symbol. The symbol index is then
9315 set at the end of bfd_elf_final_link. */
9316 indx
= r_symndx
- extsymoff
;
9317 rh
= elf_sym_hashes (input_bfd
)[indx
];
9318 while (rh
->root
.type
== bfd_link_hash_indirect
9319 || rh
->root
.type
== bfd_link_hash_warning
)
9320 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
9322 /* Setting the index to -2 tells
9323 elf_link_output_extsym that this symbol is
9325 BFD_ASSERT (rh
->indx
< 0);
9333 /* This is a reloc against a local symbol. */
9336 sym
= isymbuf
[r_symndx
];
9337 sec
= finfo
->sections
[r_symndx
];
9338 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
9340 /* I suppose the backend ought to fill in the
9341 section of any STT_SECTION symbol against a
9342 processor specific section. */
9344 if (bfd_is_abs_section (sec
))
9346 else if (sec
== NULL
|| sec
->owner
== NULL
)
9348 bfd_set_error (bfd_error_bad_value
);
9353 asection
*osec
= sec
->output_section
;
9355 /* If we have discarded a section, the output
9356 section will be the absolute section. In
9357 case of discarded SEC_MERGE sections, use
9358 the kept section. relocate_section should
9359 have already handled discarded linkonce
9361 if (bfd_is_abs_section (osec
)
9362 && sec
->kept_section
!= NULL
9363 && sec
->kept_section
->output_section
!= NULL
)
9365 osec
= sec
->kept_section
->output_section
;
9366 irela
->r_addend
-= osec
->vma
;
9369 if (!bfd_is_abs_section (osec
))
9371 r_symndx
= osec
->target_index
;
9374 struct elf_link_hash_table
*htab
;
9377 htab
= elf_hash_table (finfo
->info
);
9378 oi
= htab
->text_index_section
;
9379 if ((osec
->flags
& SEC_READONLY
) == 0
9380 && htab
->data_index_section
!= NULL
)
9381 oi
= htab
->data_index_section
;
9385 irela
->r_addend
+= osec
->vma
- oi
->vma
;
9386 r_symndx
= oi
->target_index
;
9390 BFD_ASSERT (r_symndx
!= 0);
9394 /* Adjust the addend according to where the
9395 section winds up in the output section. */
9397 irela
->r_addend
+= sec
->output_offset
;
9401 if (finfo
->indices
[r_symndx
] == -1)
9403 unsigned long shlink
;
9407 if (finfo
->info
->strip
== strip_all
)
9409 /* You can't do ld -r -s. */
9410 bfd_set_error (bfd_error_invalid_operation
);
9414 /* This symbol was skipped earlier, but
9415 since it is needed by a reloc, we
9416 must output it now. */
9417 shlink
= symtab_hdr
->sh_link
;
9418 name
= (bfd_elf_string_from_elf_section
9419 (input_bfd
, shlink
, sym
.st_name
));
9423 osec
= sec
->output_section
;
9425 _bfd_elf_section_from_bfd_section (output_bfd
,
9427 if (sym
.st_shndx
== SHN_BAD
)
9430 sym
.st_value
+= sec
->output_offset
;
9431 if (! finfo
->info
->relocatable
)
9433 sym
.st_value
+= osec
->vma
;
9434 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
9436 /* STT_TLS symbols are relative to PT_TLS
9438 BFD_ASSERT (elf_hash_table (finfo
->info
)
9440 sym
.st_value
-= (elf_hash_table (finfo
->info
)
9445 finfo
->indices
[r_symndx
]
9446 = bfd_get_symcount (output_bfd
);
9448 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
,
9453 r_symndx
= finfo
->indices
[r_symndx
];
9456 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
9457 | (irela
->r_info
& r_type_mask
));
9460 /* Swap out the relocs. */
9461 if (input_rel_hdr
->sh_size
!= 0
9462 && !bed
->elf_backend_emit_relocs (output_bfd
, o
,
9468 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
9469 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
9471 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
9472 * bed
->s
->int_rels_per_ext_rel
);
9473 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
9474 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9483 /* Write out the modified section contents. */
9484 if (bed
->elf_backend_write_section
9485 && (*bed
->elf_backend_write_section
) (output_bfd
, finfo
->info
, o
,
9488 /* Section written out. */
9490 else switch (o
->sec_info_type
)
9492 case ELF_INFO_TYPE_STABS
:
9493 if (! (_bfd_write_section_stabs
9495 &elf_hash_table (finfo
->info
)->stab_info
,
9496 o
, &elf_section_data (o
)->sec_info
, contents
)))
9499 case ELF_INFO_TYPE_MERGE
:
9500 if (! _bfd_write_merged_section (output_bfd
, o
,
9501 elf_section_data (o
)->sec_info
))
9504 case ELF_INFO_TYPE_EH_FRAME
:
9506 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
9513 if (! (o
->flags
& SEC_EXCLUDE
)
9514 && ! (o
->output_section
->flags
& SEC_NEVER_LOAD
)
9515 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
9517 (file_ptr
) o
->output_offset
,
9528 /* Generate a reloc when linking an ELF file. This is a reloc
9529 requested by the linker, and does not come from any input file. This
9530 is used to build constructor and destructor tables when linking
9534 elf_reloc_link_order (bfd
*output_bfd
,
9535 struct bfd_link_info
*info
,
9536 asection
*output_section
,
9537 struct bfd_link_order
*link_order
)
9539 reloc_howto_type
*howto
;
9543 struct elf_link_hash_entry
**rel_hash_ptr
;
9544 Elf_Internal_Shdr
*rel_hdr
;
9545 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
9546 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
9550 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
9553 bfd_set_error (bfd_error_bad_value
);
9557 addend
= link_order
->u
.reloc
.p
->addend
;
9559 /* Figure out the symbol index. */
9560 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
9561 + elf_section_data (output_section
)->rel_count
9562 + elf_section_data (output_section
)->rel_count2
);
9563 if (link_order
->type
== bfd_section_reloc_link_order
)
9565 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
9566 BFD_ASSERT (indx
!= 0);
9567 *rel_hash_ptr
= NULL
;
9571 struct elf_link_hash_entry
*h
;
9573 /* Treat a reloc against a defined symbol as though it were
9574 actually against the section. */
9575 h
= ((struct elf_link_hash_entry
*)
9576 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
9577 link_order
->u
.reloc
.p
->u
.name
,
9578 FALSE
, FALSE
, TRUE
));
9580 && (h
->root
.type
== bfd_link_hash_defined
9581 || h
->root
.type
== bfd_link_hash_defweak
))
9585 section
= h
->root
.u
.def
.section
;
9586 indx
= section
->output_section
->target_index
;
9587 *rel_hash_ptr
= NULL
;
9588 /* It seems that we ought to add the symbol value to the
9589 addend here, but in practice it has already been added
9590 because it was passed to constructor_callback. */
9591 addend
+= section
->output_section
->vma
+ section
->output_offset
;
9595 /* Setting the index to -2 tells elf_link_output_extsym that
9596 this symbol is used by a reloc. */
9603 if (! ((*info
->callbacks
->unattached_reloc
)
9604 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
9610 /* If this is an inplace reloc, we must write the addend into the
9612 if (howto
->partial_inplace
&& addend
!= 0)
9615 bfd_reloc_status_type rstat
;
9618 const char *sym_name
;
9620 size
= bfd_get_reloc_size (howto
);
9621 buf
= bfd_zmalloc (size
);
9624 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
9631 case bfd_reloc_outofrange
:
9634 case bfd_reloc_overflow
:
9635 if (link_order
->type
== bfd_section_reloc_link_order
)
9636 sym_name
= bfd_section_name (output_bfd
,
9637 link_order
->u
.reloc
.p
->u
.section
);
9639 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
9640 if (! ((*info
->callbacks
->reloc_overflow
)
9641 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
9642 NULL
, (bfd_vma
) 0)))
9649 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
9650 link_order
->offset
, size
);
9656 /* The address of a reloc is relative to the section in a
9657 relocatable file, and is a virtual address in an executable
9659 offset
= link_order
->offset
;
9660 if (! info
->relocatable
)
9661 offset
+= output_section
->vma
;
9663 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
9665 irel
[i
].r_offset
= offset
;
9667 irel
[i
].r_addend
= 0;
9669 if (bed
->s
->arch_size
== 32)
9670 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
9672 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
9674 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
9675 erel
= rel_hdr
->contents
;
9676 if (rel_hdr
->sh_type
== SHT_REL
)
9678 erel
+= (elf_section_data (output_section
)->rel_count
9679 * bed
->s
->sizeof_rel
);
9680 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
9684 irel
[0].r_addend
= addend
;
9685 erel
+= (elf_section_data (output_section
)->rel_count
9686 * bed
->s
->sizeof_rela
);
9687 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
9690 ++elf_section_data (output_section
)->rel_count
;
9696 /* Get the output vma of the section pointed to by the sh_link field. */
9699 elf_get_linked_section_vma (struct bfd_link_order
*p
)
9701 Elf_Internal_Shdr
**elf_shdrp
;
9705 s
= p
->u
.indirect
.section
;
9706 elf_shdrp
= elf_elfsections (s
->owner
);
9707 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
9708 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
9710 The Intel C compiler generates SHT_IA_64_UNWIND with
9711 SHF_LINK_ORDER. But it doesn't set the sh_link or
9712 sh_info fields. Hence we could get the situation
9713 where elfsec is 0. */
9716 const struct elf_backend_data
*bed
9717 = get_elf_backend_data (s
->owner
);
9718 if (bed
->link_order_error_handler
)
9719 bed
->link_order_error_handler
9720 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
9725 s
= elf_shdrp
[elfsec
]->bfd_section
;
9726 return s
->output_section
->vma
+ s
->output_offset
;
9731 /* Compare two sections based on the locations of the sections they are
9732 linked to. Used by elf_fixup_link_order. */
9735 compare_link_order (const void * a
, const void * b
)
9740 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
9741 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
9748 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
9749 order as their linked sections. Returns false if this could not be done
9750 because an output section includes both ordered and unordered
9751 sections. Ideally we'd do this in the linker proper. */
9754 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
9759 struct bfd_link_order
*p
;
9761 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9763 struct bfd_link_order
**sections
;
9764 asection
*s
, *other_sec
, *linkorder_sec
;
9768 linkorder_sec
= NULL
;
9771 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
9773 if (p
->type
== bfd_indirect_link_order
)
9775 s
= p
->u
.indirect
.section
;
9777 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
9778 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
9779 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
9780 && elfsec
< elf_numsections (sub
)
9781 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
)
9795 if (seen_other
&& seen_linkorder
)
9797 if (other_sec
&& linkorder_sec
)
9798 (*_bfd_error_handler
) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
9800 linkorder_sec
->owner
, other_sec
,
9803 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
9805 bfd_set_error (bfd_error_bad_value
);
9810 if (!seen_linkorder
)
9813 sections
= (struct bfd_link_order
**)
9814 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
9815 if (sections
== NULL
)
9819 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
9821 sections
[seen_linkorder
++] = p
;
9823 /* Sort the input sections in the order of their linked section. */
9824 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
9825 compare_link_order
);
9827 /* Change the offsets of the sections. */
9829 for (n
= 0; n
< seen_linkorder
; n
++)
9831 s
= sections
[n
]->u
.indirect
.section
;
9832 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
9833 s
->output_offset
= offset
;
9834 sections
[n
]->offset
= offset
;
9835 offset
+= sections
[n
]->size
;
9842 /* Do the final step of an ELF link. */
9845 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
9847 bfd_boolean dynamic
;
9848 bfd_boolean emit_relocs
;
9850 struct elf_final_link_info finfo
;
9851 register asection
*o
;
9852 register struct bfd_link_order
*p
;
9854 bfd_size_type max_contents_size
;
9855 bfd_size_type max_external_reloc_size
;
9856 bfd_size_type max_internal_reloc_count
;
9857 bfd_size_type max_sym_count
;
9858 bfd_size_type max_sym_shndx_count
;
9860 Elf_Internal_Sym elfsym
;
9862 Elf_Internal_Shdr
*symtab_hdr
;
9863 Elf_Internal_Shdr
*symtab_shndx_hdr
;
9864 Elf_Internal_Shdr
*symstrtab_hdr
;
9865 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9866 struct elf_outext_info eoinfo
;
9868 size_t relativecount
= 0;
9869 asection
*reldyn
= 0;
9871 asection
*attr_section
= NULL
;
9872 bfd_vma attr_size
= 0;
9873 const char *std_attrs_section
;
9875 if (! is_elf_hash_table (info
->hash
))
9879 abfd
->flags
|= DYNAMIC
;
9881 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
9882 dynobj
= elf_hash_table (info
)->dynobj
;
9884 emit_relocs
= (info
->relocatable
9885 || info
->emitrelocations
);
9888 finfo
.output_bfd
= abfd
;
9889 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
9890 if (finfo
.symstrtab
== NULL
)
9895 finfo
.dynsym_sec
= NULL
;
9896 finfo
.hash_sec
= NULL
;
9897 finfo
.symver_sec
= NULL
;
9901 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
9902 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
9903 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
);
9904 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
9905 /* Note that it is OK if symver_sec is NULL. */
9908 finfo
.contents
= NULL
;
9909 finfo
.external_relocs
= NULL
;
9910 finfo
.internal_relocs
= NULL
;
9911 finfo
.external_syms
= NULL
;
9912 finfo
.locsym_shndx
= NULL
;
9913 finfo
.internal_syms
= NULL
;
9914 finfo
.indices
= NULL
;
9915 finfo
.sections
= NULL
;
9916 finfo
.symbuf
= NULL
;
9917 finfo
.symshndxbuf
= NULL
;
9918 finfo
.symbuf_count
= 0;
9919 finfo
.shndxbuf_size
= 0;
9921 /* The object attributes have been merged. Remove the input
9922 sections from the link, and set the contents of the output
9924 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
9925 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
9927 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
9928 || strcmp (o
->name
, ".gnu.attributes") == 0)
9930 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
9932 asection
*input_section
;
9934 if (p
->type
!= bfd_indirect_link_order
)
9936 input_section
= p
->u
.indirect
.section
;
9937 /* Hack: reset the SEC_HAS_CONTENTS flag so that
9938 elf_link_input_bfd ignores this section. */
9939 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
9942 attr_size
= bfd_elf_obj_attr_size (abfd
);
9945 bfd_set_section_size (abfd
, o
, attr_size
);
9947 /* Skip this section later on. */
9948 o
->map_head
.link_order
= NULL
;
9951 o
->flags
|= SEC_EXCLUDE
;
9955 /* Count up the number of relocations we will output for each output
9956 section, so that we know the sizes of the reloc sections. We
9957 also figure out some maximum sizes. */
9958 max_contents_size
= 0;
9959 max_external_reloc_size
= 0;
9960 max_internal_reloc_count
= 0;
9962 max_sym_shndx_count
= 0;
9964 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
9966 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
9969 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
9971 unsigned int reloc_count
= 0;
9972 struct bfd_elf_section_data
*esdi
= NULL
;
9973 unsigned int *rel_count1
;
9975 if (p
->type
== bfd_section_reloc_link_order
9976 || p
->type
== bfd_symbol_reloc_link_order
)
9978 else if (p
->type
== bfd_indirect_link_order
)
9982 sec
= p
->u
.indirect
.section
;
9983 esdi
= elf_section_data (sec
);
9985 /* Mark all sections which are to be included in the
9986 link. This will normally be every section. We need
9987 to do this so that we can identify any sections which
9988 the linker has decided to not include. */
9989 sec
->linker_mark
= TRUE
;
9991 if (sec
->flags
& SEC_MERGE
)
9994 if (info
->relocatable
|| info
->emitrelocations
)
9995 reloc_count
= sec
->reloc_count
;
9996 else if (bed
->elf_backend_count_relocs
)
9998 Elf_Internal_Rela
* relocs
;
10000 relocs
= _bfd_elf_link_read_relocs (sec
->owner
, sec
,
10002 info
->keep_memory
);
10004 if (relocs
!= NULL
)
10007 = (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
10009 if (elf_section_data (sec
)->relocs
!= relocs
)
10014 if (sec
->rawsize
> max_contents_size
)
10015 max_contents_size
= sec
->rawsize
;
10016 if (sec
->size
> max_contents_size
)
10017 max_contents_size
= sec
->size
;
10019 /* We are interested in just local symbols, not all
10021 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
10022 && (sec
->owner
->flags
& DYNAMIC
) == 0)
10026 if (elf_bad_symtab (sec
->owner
))
10027 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
10028 / bed
->s
->sizeof_sym
);
10030 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
10032 if (sym_count
> max_sym_count
)
10033 max_sym_count
= sym_count
;
10035 if (sym_count
> max_sym_shndx_count
10036 && elf_symtab_shndx (sec
->owner
) != 0)
10037 max_sym_shndx_count
= sym_count
;
10039 if ((sec
->flags
& SEC_RELOC
) != 0)
10043 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
10044 if (ext_size
> max_external_reloc_size
)
10045 max_external_reloc_size
= ext_size
;
10046 if (sec
->reloc_count
> max_internal_reloc_count
)
10047 max_internal_reloc_count
= sec
->reloc_count
;
10052 if (reloc_count
== 0)
10055 o
->reloc_count
+= reloc_count
;
10057 /* MIPS may have a mix of REL and RELA relocs on sections.
10058 To support this curious ABI we keep reloc counts in
10059 elf_section_data too. We must be careful to add the
10060 relocations from the input section to the right output
10061 count. FIXME: Get rid of one count. We have
10062 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
10063 rel_count1
= &esdo
->rel_count
;
10066 bfd_boolean same_size
;
10067 bfd_size_type entsize1
;
10069 entsize1
= esdi
->rel_hdr
.sh_entsize
;
10070 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
10071 || entsize1
== bed
->s
->sizeof_rela
);
10072 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
10075 rel_count1
= &esdo
->rel_count2
;
10077 if (esdi
->rel_hdr2
!= NULL
)
10079 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
10080 unsigned int alt_count
;
10081 unsigned int *rel_count2
;
10083 BFD_ASSERT (entsize2
!= entsize1
10084 && (entsize2
== bed
->s
->sizeof_rel
10085 || entsize2
== bed
->s
->sizeof_rela
));
10087 rel_count2
= &esdo
->rel_count2
;
10089 rel_count2
= &esdo
->rel_count
;
10091 /* The following is probably too simplistic if the
10092 backend counts output relocs unusually. */
10093 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
10094 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
10095 *rel_count2
+= alt_count
;
10096 reloc_count
-= alt_count
;
10099 *rel_count1
+= reloc_count
;
10102 if (o
->reloc_count
> 0)
10103 o
->flags
|= SEC_RELOC
;
10106 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10107 set it (this is probably a bug) and if it is set
10108 assign_section_numbers will create a reloc section. */
10109 o
->flags
&=~ SEC_RELOC
;
10112 /* If the SEC_ALLOC flag is not set, force the section VMA to
10113 zero. This is done in elf_fake_sections as well, but forcing
10114 the VMA to 0 here will ensure that relocs against these
10115 sections are handled correctly. */
10116 if ((o
->flags
& SEC_ALLOC
) == 0
10117 && ! o
->user_set_vma
)
10121 if (! info
->relocatable
&& merged
)
10122 elf_link_hash_traverse (elf_hash_table (info
),
10123 _bfd_elf_link_sec_merge_syms
, abfd
);
10125 /* Figure out the file positions for everything but the symbol table
10126 and the relocs. We set symcount to force assign_section_numbers
10127 to create a symbol table. */
10128 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
10129 BFD_ASSERT (! abfd
->output_has_begun
);
10130 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
10133 /* Set sizes, and assign file positions for reloc sections. */
10134 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10136 if ((o
->flags
& SEC_RELOC
) != 0)
10138 if (!(_bfd_elf_link_size_reloc_section
10139 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
10142 if (elf_section_data (o
)->rel_hdr2
10143 && !(_bfd_elf_link_size_reloc_section
10144 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
10148 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10149 to count upwards while actually outputting the relocations. */
10150 elf_section_data (o
)->rel_count
= 0;
10151 elf_section_data (o
)->rel_count2
= 0;
10154 _bfd_elf_assign_file_positions_for_relocs (abfd
);
10156 /* We have now assigned file positions for all the sections except
10157 .symtab and .strtab. We start the .symtab section at the current
10158 file position, and write directly to it. We build the .strtab
10159 section in memory. */
10160 bfd_get_symcount (abfd
) = 0;
10161 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10162 /* sh_name is set in prep_headers. */
10163 symtab_hdr
->sh_type
= SHT_SYMTAB
;
10164 /* sh_flags, sh_addr and sh_size all start off zero. */
10165 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
10166 /* sh_link is set in assign_section_numbers. */
10167 /* sh_info is set below. */
10168 /* sh_offset is set just below. */
10169 symtab_hdr
->sh_addralign
= 1 << bed
->s
->log_file_align
;
10171 off
= elf_tdata (abfd
)->next_file_pos
;
10172 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
10174 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10175 incorrect. We do not yet know the size of the .symtab section.
10176 We correct next_file_pos below, after we do know the size. */
10178 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10179 continuously seeking to the right position in the file. */
10180 if (! info
->keep_memory
|| max_sym_count
< 20)
10181 finfo
.symbuf_size
= 20;
10183 finfo
.symbuf_size
= max_sym_count
;
10184 amt
= finfo
.symbuf_size
;
10185 amt
*= bed
->s
->sizeof_sym
;
10186 finfo
.symbuf
= bfd_malloc (amt
);
10187 if (finfo
.symbuf
== NULL
)
10189 if (elf_numsections (abfd
) > SHN_LORESERVE
)
10191 /* Wild guess at number of output symbols. realloc'd as needed. */
10192 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
10193 finfo
.shndxbuf_size
= amt
;
10194 amt
*= sizeof (Elf_External_Sym_Shndx
);
10195 finfo
.symshndxbuf
= bfd_zmalloc (amt
);
10196 if (finfo
.symshndxbuf
== NULL
)
10200 /* Start writing out the symbol table. The first symbol is always a
10202 if (info
->strip
!= strip_all
10205 elfsym
.st_value
= 0;
10206 elfsym
.st_size
= 0;
10207 elfsym
.st_info
= 0;
10208 elfsym
.st_other
= 0;
10209 elfsym
.st_shndx
= SHN_UNDEF
;
10210 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
10215 /* Output a symbol for each section. We output these even if we are
10216 discarding local symbols, since they are used for relocs. These
10217 symbols have no names. We store the index of each one in the
10218 index field of the section, so that we can find it again when
10219 outputting relocs. */
10220 if (info
->strip
!= strip_all
10223 elfsym
.st_size
= 0;
10224 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10225 elfsym
.st_other
= 0;
10226 elfsym
.st_value
= 0;
10227 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10229 o
= bfd_section_from_elf_index (abfd
, i
);
10232 o
->target_index
= bfd_get_symcount (abfd
);
10233 elfsym
.st_shndx
= i
;
10234 if (!info
->relocatable
)
10235 elfsym
.st_value
= o
->vma
;
10236 if (!elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
))
10239 if (i
== SHN_LORESERVE
- 1)
10240 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
10244 /* Allocate some memory to hold information read in from the input
10246 if (max_contents_size
!= 0)
10248 finfo
.contents
= bfd_malloc (max_contents_size
);
10249 if (finfo
.contents
== NULL
)
10253 if (max_external_reloc_size
!= 0)
10255 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
10256 if (finfo
.external_relocs
== NULL
)
10260 if (max_internal_reloc_count
!= 0)
10262 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10263 amt
*= sizeof (Elf_Internal_Rela
);
10264 finfo
.internal_relocs
= bfd_malloc (amt
);
10265 if (finfo
.internal_relocs
== NULL
)
10269 if (max_sym_count
!= 0)
10271 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
10272 finfo
.external_syms
= bfd_malloc (amt
);
10273 if (finfo
.external_syms
== NULL
)
10276 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
10277 finfo
.internal_syms
= bfd_malloc (amt
);
10278 if (finfo
.internal_syms
== NULL
)
10281 amt
= max_sym_count
* sizeof (long);
10282 finfo
.indices
= bfd_malloc (amt
);
10283 if (finfo
.indices
== NULL
)
10286 amt
= max_sym_count
* sizeof (asection
*);
10287 finfo
.sections
= bfd_malloc (amt
);
10288 if (finfo
.sections
== NULL
)
10292 if (max_sym_shndx_count
!= 0)
10294 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
10295 finfo
.locsym_shndx
= bfd_malloc (amt
);
10296 if (finfo
.locsym_shndx
== NULL
)
10300 if (elf_hash_table (info
)->tls_sec
)
10302 bfd_vma base
, end
= 0;
10305 for (sec
= elf_hash_table (info
)->tls_sec
;
10306 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
10309 bfd_size_type size
= sec
->size
;
10312 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
10314 struct bfd_link_order
*o
= sec
->map_tail
.link_order
;
10316 size
= o
->offset
+ o
->size
;
10318 end
= sec
->vma
+ size
;
10320 base
= elf_hash_table (info
)->tls_sec
->vma
;
10321 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
10322 elf_hash_table (info
)->tls_size
= end
- base
;
10325 /* Reorder SHF_LINK_ORDER sections. */
10326 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10328 if (!elf_fixup_link_order (abfd
, o
))
10332 /* Since ELF permits relocations to be against local symbols, we
10333 must have the local symbols available when we do the relocations.
10334 Since we would rather only read the local symbols once, and we
10335 would rather not keep them in memory, we handle all the
10336 relocations for a single input file at the same time.
10338 Unfortunately, there is no way to know the total number of local
10339 symbols until we have seen all of them, and the local symbol
10340 indices precede the global symbol indices. This means that when
10341 we are generating relocatable output, and we see a reloc against
10342 a global symbol, we can not know the symbol index until we have
10343 finished examining all the local symbols to see which ones we are
10344 going to output. To deal with this, we keep the relocations in
10345 memory, and don't output them until the end of the link. This is
10346 an unfortunate waste of memory, but I don't see a good way around
10347 it. Fortunately, it only happens when performing a relocatable
10348 link, which is not the common case. FIXME: If keep_memory is set
10349 we could write the relocs out and then read them again; I don't
10350 know how bad the memory loss will be. */
10352 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10353 sub
->output_has_begun
= FALSE
;
10354 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10356 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10358 if (p
->type
== bfd_indirect_link_order
10359 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
10360 == bfd_target_elf_flavour
)
10361 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
10363 if (! sub
->output_has_begun
)
10365 if (! elf_link_input_bfd (&finfo
, sub
))
10367 sub
->output_has_begun
= TRUE
;
10370 else if (p
->type
== bfd_section_reloc_link_order
10371 || p
->type
== bfd_symbol_reloc_link_order
)
10373 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
10378 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
10384 /* Free symbol buffer if needed. */
10385 if (!info
->reduce_memory_overheads
)
10387 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10388 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10389 && elf_tdata (sub
)->symbuf
)
10391 free (elf_tdata (sub
)->symbuf
);
10392 elf_tdata (sub
)->symbuf
= NULL
;
10396 /* Output any global symbols that got converted to local in a
10397 version script or due to symbol visibility. We do this in a
10398 separate step since ELF requires all local symbols to appear
10399 prior to any global symbols. FIXME: We should only do this if
10400 some global symbols were, in fact, converted to become local.
10401 FIXME: Will this work correctly with the Irix 5 linker? */
10402 eoinfo
.failed
= FALSE
;
10403 eoinfo
.finfo
= &finfo
;
10404 eoinfo
.localsyms
= TRUE
;
10405 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10410 /* If backend needs to output some local symbols not present in the hash
10411 table, do it now. */
10412 if (bed
->elf_backend_output_arch_local_syms
)
10414 typedef bfd_boolean (*out_sym_func
)
10415 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10416 struct elf_link_hash_entry
*);
10418 if (! ((*bed
->elf_backend_output_arch_local_syms
)
10419 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10423 /* That wrote out all the local symbols. Finish up the symbol table
10424 with the global symbols. Even if we want to strip everything we
10425 can, we still need to deal with those global symbols that got
10426 converted to local in a version script. */
10428 /* The sh_info field records the index of the first non local symbol. */
10429 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
10432 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
10434 Elf_Internal_Sym sym
;
10435 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
10436 long last_local
= 0;
10438 /* Write out the section symbols for the output sections. */
10439 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
10445 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10448 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
10454 dynindx
= elf_section_data (s
)->dynindx
;
10457 indx
= elf_section_data (s
)->this_idx
;
10458 BFD_ASSERT (indx
> 0);
10459 sym
.st_shndx
= indx
;
10460 if (! check_dynsym (abfd
, &sym
))
10462 sym
.st_value
= s
->vma
;
10463 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
10464 if (last_local
< dynindx
)
10465 last_local
= dynindx
;
10466 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10470 /* Write out the local dynsyms. */
10471 if (elf_hash_table (info
)->dynlocal
)
10473 struct elf_link_local_dynamic_entry
*e
;
10474 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
10479 sym
.st_size
= e
->isym
.st_size
;
10480 sym
.st_other
= e
->isym
.st_other
;
10482 /* Copy the internal symbol as is.
10483 Note that we saved a word of storage and overwrote
10484 the original st_name with the dynstr_index. */
10487 s
= bfd_section_from_elf_index (e
->input_bfd
,
10492 elf_section_data (s
->output_section
)->this_idx
;
10493 if (! check_dynsym (abfd
, &sym
))
10495 sym
.st_value
= (s
->output_section
->vma
10497 + e
->isym
.st_value
);
10500 if (last_local
< e
->dynindx
)
10501 last_local
= e
->dynindx
;
10503 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
10504 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10508 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
10512 /* We get the global symbols from the hash table. */
10513 eoinfo
.failed
= FALSE
;
10514 eoinfo
.localsyms
= FALSE
;
10515 eoinfo
.finfo
= &finfo
;
10516 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10521 /* If backend needs to output some symbols not present in the hash
10522 table, do it now. */
10523 if (bed
->elf_backend_output_arch_syms
)
10525 typedef bfd_boolean (*out_sym_func
)
10526 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10527 struct elf_link_hash_entry
*);
10529 if (! ((*bed
->elf_backend_output_arch_syms
)
10530 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10534 /* Flush all symbols to the file. */
10535 if (! elf_link_flush_output_syms (&finfo
, bed
))
10538 /* Now we know the size of the symtab section. */
10539 off
+= symtab_hdr
->sh_size
;
10541 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
10542 if (symtab_shndx_hdr
->sh_name
!= 0)
10544 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
10545 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
10546 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
10547 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
10548 symtab_shndx_hdr
->sh_size
= amt
;
10550 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
10553 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
10554 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
10559 /* Finish up and write out the symbol string table (.strtab)
10561 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
10562 /* sh_name was set in prep_headers. */
10563 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
10564 symstrtab_hdr
->sh_flags
= 0;
10565 symstrtab_hdr
->sh_addr
= 0;
10566 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
10567 symstrtab_hdr
->sh_entsize
= 0;
10568 symstrtab_hdr
->sh_link
= 0;
10569 symstrtab_hdr
->sh_info
= 0;
10570 /* sh_offset is set just below. */
10571 symstrtab_hdr
->sh_addralign
= 1;
10573 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
10574 elf_tdata (abfd
)->next_file_pos
= off
;
10576 if (bfd_get_symcount (abfd
) > 0)
10578 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
10579 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
10583 /* Adjust the relocs to have the correct symbol indices. */
10584 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10586 if ((o
->flags
& SEC_RELOC
) == 0)
10589 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
10590 elf_section_data (o
)->rel_count
,
10591 elf_section_data (o
)->rel_hashes
);
10592 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
10593 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
10594 elf_section_data (o
)->rel_count2
,
10595 (elf_section_data (o
)->rel_hashes
10596 + elf_section_data (o
)->rel_count
));
10598 /* Set the reloc_count field to 0 to prevent write_relocs from
10599 trying to swap the relocs out itself. */
10600 o
->reloc_count
= 0;
10603 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
10604 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
10606 /* If we are linking against a dynamic object, or generating a
10607 shared library, finish up the dynamic linking information. */
10610 bfd_byte
*dyncon
, *dynconend
;
10612 /* Fix up .dynamic entries. */
10613 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10614 BFD_ASSERT (o
!= NULL
);
10616 dyncon
= o
->contents
;
10617 dynconend
= o
->contents
+ o
->size
;
10618 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10620 Elf_Internal_Dyn dyn
;
10624 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10631 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
10633 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
10635 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
10636 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
10639 dyn
.d_un
.d_val
= relativecount
;
10646 name
= info
->init_function
;
10649 name
= info
->fini_function
;
10652 struct elf_link_hash_entry
*h
;
10654 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
10655 FALSE
, FALSE
, TRUE
);
10657 && (h
->root
.type
== bfd_link_hash_defined
10658 || h
->root
.type
== bfd_link_hash_defweak
))
10660 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
10661 o
= h
->root
.u
.def
.section
;
10662 if (o
->output_section
!= NULL
)
10663 dyn
.d_un
.d_val
+= (o
->output_section
->vma
10664 + o
->output_offset
);
10667 /* The symbol is imported from another shared
10668 library and does not apply to this one. */
10669 dyn
.d_un
.d_val
= 0;
10676 case DT_PREINIT_ARRAYSZ
:
10677 name
= ".preinit_array";
10679 case DT_INIT_ARRAYSZ
:
10680 name
= ".init_array";
10682 case DT_FINI_ARRAYSZ
:
10683 name
= ".fini_array";
10685 o
= bfd_get_section_by_name (abfd
, name
);
10688 (*_bfd_error_handler
)
10689 (_("%B: could not find output section %s"), abfd
, name
);
10693 (*_bfd_error_handler
)
10694 (_("warning: %s section has zero size"), name
);
10695 dyn
.d_un
.d_val
= o
->size
;
10698 case DT_PREINIT_ARRAY
:
10699 name
= ".preinit_array";
10701 case DT_INIT_ARRAY
:
10702 name
= ".init_array";
10704 case DT_FINI_ARRAY
:
10705 name
= ".fini_array";
10712 name
= ".gnu.hash";
10721 name
= ".gnu.version_d";
10724 name
= ".gnu.version_r";
10727 name
= ".gnu.version";
10729 o
= bfd_get_section_by_name (abfd
, name
);
10732 (*_bfd_error_handler
)
10733 (_("%B: could not find output section %s"), abfd
, name
);
10736 dyn
.d_un
.d_ptr
= o
->vma
;
10743 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
10747 dyn
.d_un
.d_val
= 0;
10748 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10750 Elf_Internal_Shdr
*hdr
;
10752 hdr
= elf_elfsections (abfd
)[i
];
10753 if (hdr
->sh_type
== type
10754 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
10756 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
10757 dyn
.d_un
.d_val
+= hdr
->sh_size
;
10760 if (dyn
.d_un
.d_val
== 0
10761 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
10762 dyn
.d_un
.d_val
= hdr
->sh_addr
;
10768 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
10772 /* If we have created any dynamic sections, then output them. */
10773 if (dynobj
!= NULL
)
10775 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
10778 /* Check for DT_TEXTREL (late, in case the backend removes it). */
10779 if (info
->warn_shared_textrel
&& info
->shared
)
10781 bfd_byte
*dyncon
, *dynconend
;
10783 /* Fix up .dynamic entries. */
10784 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10785 BFD_ASSERT (o
!= NULL
);
10787 dyncon
= o
->contents
;
10788 dynconend
= o
->contents
+ o
->size
;
10789 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10791 Elf_Internal_Dyn dyn
;
10793 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10795 if (dyn
.d_tag
== DT_TEXTREL
)
10797 info
->callbacks
->einfo
10798 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
10804 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
10806 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10808 || o
->output_section
== bfd_abs_section_ptr
)
10810 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
10812 /* At this point, we are only interested in sections
10813 created by _bfd_elf_link_create_dynamic_sections. */
10816 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
10818 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
10820 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
10822 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
10824 if (! bfd_set_section_contents (abfd
, o
->output_section
,
10826 (file_ptr
) o
->output_offset
,
10832 /* The contents of the .dynstr section are actually in a
10834 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
10835 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
10836 || ! _bfd_elf_strtab_emit (abfd
,
10837 elf_hash_table (info
)->dynstr
))
10843 if (info
->relocatable
)
10845 bfd_boolean failed
= FALSE
;
10847 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
10852 /* If we have optimized stabs strings, output them. */
10853 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
10855 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
10859 if (info
->eh_frame_hdr
)
10861 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
10865 if (finfo
.symstrtab
!= NULL
)
10866 _bfd_stringtab_free (finfo
.symstrtab
);
10867 if (finfo
.contents
!= NULL
)
10868 free (finfo
.contents
);
10869 if (finfo
.external_relocs
!= NULL
)
10870 free (finfo
.external_relocs
);
10871 if (finfo
.internal_relocs
!= NULL
)
10872 free (finfo
.internal_relocs
);
10873 if (finfo
.external_syms
!= NULL
)
10874 free (finfo
.external_syms
);
10875 if (finfo
.locsym_shndx
!= NULL
)
10876 free (finfo
.locsym_shndx
);
10877 if (finfo
.internal_syms
!= NULL
)
10878 free (finfo
.internal_syms
);
10879 if (finfo
.indices
!= NULL
)
10880 free (finfo
.indices
);
10881 if (finfo
.sections
!= NULL
)
10882 free (finfo
.sections
);
10883 if (finfo
.symbuf
!= NULL
)
10884 free (finfo
.symbuf
);
10885 if (finfo
.symshndxbuf
!= NULL
)
10886 free (finfo
.symshndxbuf
);
10887 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10889 if ((o
->flags
& SEC_RELOC
) != 0
10890 && elf_section_data (o
)->rel_hashes
!= NULL
)
10891 free (elf_section_data (o
)->rel_hashes
);
10894 elf_tdata (abfd
)->linker
= TRUE
;
10898 bfd_byte
*contents
= bfd_malloc (attr_size
);
10899 if (contents
== NULL
)
10900 return FALSE
; /* Bail out and fail. */
10901 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
10902 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
10909 if (finfo
.symstrtab
!= NULL
)
10910 _bfd_stringtab_free (finfo
.symstrtab
);
10911 if (finfo
.contents
!= NULL
)
10912 free (finfo
.contents
);
10913 if (finfo
.external_relocs
!= NULL
)
10914 free (finfo
.external_relocs
);
10915 if (finfo
.internal_relocs
!= NULL
)
10916 free (finfo
.internal_relocs
);
10917 if (finfo
.external_syms
!= NULL
)
10918 free (finfo
.external_syms
);
10919 if (finfo
.locsym_shndx
!= NULL
)
10920 free (finfo
.locsym_shndx
);
10921 if (finfo
.internal_syms
!= NULL
)
10922 free (finfo
.internal_syms
);
10923 if (finfo
.indices
!= NULL
)
10924 free (finfo
.indices
);
10925 if (finfo
.sections
!= NULL
)
10926 free (finfo
.sections
);
10927 if (finfo
.symbuf
!= NULL
)
10928 free (finfo
.symbuf
);
10929 if (finfo
.symshndxbuf
!= NULL
)
10930 free (finfo
.symshndxbuf
);
10931 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10933 if ((o
->flags
& SEC_RELOC
) != 0
10934 && elf_section_data (o
)->rel_hashes
!= NULL
)
10935 free (elf_section_data (o
)->rel_hashes
);
10941 /* Initialize COOKIE for input bfd ABFD. */
10944 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
10945 struct bfd_link_info
*info
, bfd
*abfd
)
10947 Elf_Internal_Shdr
*symtab_hdr
;
10948 const struct elf_backend_data
*bed
;
10950 bed
= get_elf_backend_data (abfd
);
10951 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10953 cookie
->abfd
= abfd
;
10954 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
10955 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
10956 if (cookie
->bad_symtab
)
10958 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10959 cookie
->extsymoff
= 0;
10963 cookie
->locsymcount
= symtab_hdr
->sh_info
;
10964 cookie
->extsymoff
= symtab_hdr
->sh_info
;
10967 if (bed
->s
->arch_size
== 32)
10968 cookie
->r_sym_shift
= 8;
10970 cookie
->r_sym_shift
= 32;
10972 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10973 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
10975 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
10976 cookie
->locsymcount
, 0,
10978 if (cookie
->locsyms
== NULL
)
10980 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
10983 if (info
->keep_memory
)
10984 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
10989 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
10992 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
10994 Elf_Internal_Shdr
*symtab_hdr
;
10996 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10997 if (cookie
->locsyms
!= NULL
10998 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
10999 free (cookie
->locsyms
);
11002 /* Initialize the relocation information in COOKIE for input section SEC
11003 of input bfd ABFD. */
11006 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11007 struct bfd_link_info
*info
, bfd
*abfd
,
11010 const struct elf_backend_data
*bed
;
11012 if (sec
->reloc_count
== 0)
11014 cookie
->rels
= NULL
;
11015 cookie
->relend
= NULL
;
11019 bed
= get_elf_backend_data (abfd
);
11021 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
11022 info
->keep_memory
);
11023 if (cookie
->rels
== NULL
)
11025 cookie
->rel
= cookie
->rels
;
11026 cookie
->relend
= (cookie
->rels
11027 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
11029 cookie
->rel
= cookie
->rels
;
11033 /* Free the memory allocated by init_reloc_cookie_rels,
11037 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11040 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
11041 free (cookie
->rels
);
11044 /* Initialize the whole of COOKIE for input section SEC. */
11047 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11048 struct bfd_link_info
*info
,
11051 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
11053 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
11058 fini_reloc_cookie (cookie
, sec
->owner
);
11063 /* Free the memory allocated by init_reloc_cookie_for_section,
11067 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11070 fini_reloc_cookie_rels (cookie
, sec
);
11071 fini_reloc_cookie (cookie
, sec
->owner
);
11074 /* Garbage collect unused sections. */
11076 /* Default gc_mark_hook. */
11079 _bfd_elf_gc_mark_hook (asection
*sec
,
11080 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
11081 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
11082 struct elf_link_hash_entry
*h
,
11083 Elf_Internal_Sym
*sym
)
11087 switch (h
->root
.type
)
11089 case bfd_link_hash_defined
:
11090 case bfd_link_hash_defweak
:
11091 return h
->root
.u
.def
.section
;
11093 case bfd_link_hash_common
:
11094 return h
->root
.u
.c
.p
->section
;
11101 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
11106 /* COOKIE->rel describes a relocation against section SEC, which is
11107 a section we've decided to keep. Return the section that contains
11108 the relocation symbol, or NULL if no section contains it. */
11111 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
11112 elf_gc_mark_hook_fn gc_mark_hook
,
11113 struct elf_reloc_cookie
*cookie
)
11115 unsigned long r_symndx
;
11116 struct elf_link_hash_entry
*h
;
11118 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
11122 if (r_symndx
>= cookie
->locsymcount
11123 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11125 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
11126 while (h
->root
.type
== bfd_link_hash_indirect
11127 || h
->root
.type
== bfd_link_hash_warning
)
11128 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11129 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
11132 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
11133 &cookie
->locsyms
[r_symndx
]);
11136 /* COOKIE->rel describes a relocation against section SEC, which is
11137 a section we've decided to keep. Mark the section that contains
11138 the relocation symbol. */
11141 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
11143 elf_gc_mark_hook_fn gc_mark_hook
,
11144 struct elf_reloc_cookie
*cookie
)
11148 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
);
11149 if (rsec
&& !rsec
->gc_mark
)
11151 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
11153 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
11159 /* The mark phase of garbage collection. For a given section, mark
11160 it and any sections in this section's group, and all the sections
11161 which define symbols to which it refers. */
11164 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
11166 elf_gc_mark_hook_fn gc_mark_hook
)
11169 asection
*group_sec
, *eh_frame
;
11173 /* Mark all the sections in the group. */
11174 group_sec
= elf_section_data (sec
)->next_in_group
;
11175 if (group_sec
&& !group_sec
->gc_mark
)
11176 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
11179 /* Look through the section relocs. */
11181 eh_frame
= elf_eh_frame_section (sec
->owner
);
11182 if ((sec
->flags
& SEC_RELOC
) != 0
11183 && sec
->reloc_count
> 0
11184 && sec
!= eh_frame
)
11186 struct elf_reloc_cookie cookie
;
11188 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
11192 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
11193 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
11198 fini_reloc_cookie_for_section (&cookie
, sec
);
11202 if (ret
&& eh_frame
&& elf_fde_list (sec
))
11204 struct elf_reloc_cookie cookie
;
11206 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
11210 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
11211 gc_mark_hook
, &cookie
))
11213 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
11220 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11222 struct elf_gc_sweep_symbol_info
11224 struct bfd_link_info
*info
;
11225 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
11230 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
11232 if (h
->root
.type
== bfd_link_hash_warning
)
11233 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11235 if ((h
->root
.type
== bfd_link_hash_defined
11236 || h
->root
.type
== bfd_link_hash_defweak
)
11237 && !h
->root
.u
.def
.section
->gc_mark
11238 && !(h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
))
11240 struct elf_gc_sweep_symbol_info
*inf
= data
;
11241 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
11247 /* The sweep phase of garbage collection. Remove all garbage sections. */
11249 typedef bfd_boolean (*gc_sweep_hook_fn
)
11250 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
11253 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
11256 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11257 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
11258 unsigned long section_sym_count
;
11259 struct elf_gc_sweep_symbol_info sweep_info
;
11261 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11265 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11268 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11270 /* Keep debug and special sections. */
11271 if ((o
->flags
& (SEC_DEBUGGING
| SEC_LINKER_CREATED
)) != 0
11272 || (o
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
11278 /* Skip sweeping sections already excluded. */
11279 if (o
->flags
& SEC_EXCLUDE
)
11282 /* Since this is early in the link process, it is simple
11283 to remove a section from the output. */
11284 o
->flags
|= SEC_EXCLUDE
;
11286 if (info
->print_gc_sections
&& o
->size
!= 0)
11287 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
11289 /* But we also have to update some of the relocation
11290 info we collected before. */
11292 && (o
->flags
& SEC_RELOC
) != 0
11293 && o
->reloc_count
> 0
11294 && !bfd_is_abs_section (o
->output_section
))
11296 Elf_Internal_Rela
*internal_relocs
;
11300 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
11301 info
->keep_memory
);
11302 if (internal_relocs
== NULL
)
11305 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
11307 if (elf_section_data (o
)->relocs
!= internal_relocs
)
11308 free (internal_relocs
);
11316 /* Remove the symbols that were in the swept sections from the dynamic
11317 symbol table. GCFIXME: Anyone know how to get them out of the
11318 static symbol table as well? */
11319 sweep_info
.info
= info
;
11320 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
11321 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
11324 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
11328 /* Propagate collected vtable information. This is called through
11329 elf_link_hash_traverse. */
11332 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
11334 if (h
->root
.type
== bfd_link_hash_warning
)
11335 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11337 /* Those that are not vtables. */
11338 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11341 /* Those vtables that do not have parents, we cannot merge. */
11342 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
11345 /* If we've already been done, exit. */
11346 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
11349 /* Make sure the parent's table is up to date. */
11350 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
11352 if (h
->vtable
->used
== NULL
)
11354 /* None of this table's entries were referenced. Re-use the
11356 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
11357 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
11362 bfd_boolean
*cu
, *pu
;
11364 /* Or the parent's entries into ours. */
11365 cu
= h
->vtable
->used
;
11367 pu
= h
->vtable
->parent
->vtable
->used
;
11370 const struct elf_backend_data
*bed
;
11371 unsigned int log_file_align
;
11373 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
11374 log_file_align
= bed
->s
->log_file_align
;
11375 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
11390 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
11393 bfd_vma hstart
, hend
;
11394 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
11395 const struct elf_backend_data
*bed
;
11396 unsigned int log_file_align
;
11398 if (h
->root
.type
== bfd_link_hash_warning
)
11399 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11401 /* Take care of both those symbols that do not describe vtables as
11402 well as those that are not loaded. */
11403 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11406 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
11407 || h
->root
.type
== bfd_link_hash_defweak
);
11409 sec
= h
->root
.u
.def
.section
;
11410 hstart
= h
->root
.u
.def
.value
;
11411 hend
= hstart
+ h
->size
;
11413 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
11415 return *(bfd_boolean
*) okp
= FALSE
;
11416 bed
= get_elf_backend_data (sec
->owner
);
11417 log_file_align
= bed
->s
->log_file_align
;
11419 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
11421 for (rel
= relstart
; rel
< relend
; ++rel
)
11422 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
11424 /* If the entry is in use, do nothing. */
11425 if (h
->vtable
->used
11426 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
11428 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
11429 if (h
->vtable
->used
[entry
])
11432 /* Otherwise, kill it. */
11433 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
11439 /* Mark sections containing dynamically referenced symbols. When
11440 building shared libraries, we must assume that any visible symbol is
11444 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
11446 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
11448 if (h
->root
.type
== bfd_link_hash_warning
)
11449 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11451 if ((h
->root
.type
== bfd_link_hash_defined
11452 || h
->root
.type
== bfd_link_hash_defweak
)
11454 || (!info
->executable
11456 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
11457 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
)))
11458 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11463 /* Keep all sections containing symbols undefined on the command-line,
11464 and the section containing the entry symbol. */
11467 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
11469 struct bfd_sym_chain
*sym
;
11471 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
11473 struct elf_link_hash_entry
*h
;
11475 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
11476 FALSE
, FALSE
, FALSE
);
11479 && (h
->root
.type
== bfd_link_hash_defined
11480 || h
->root
.type
== bfd_link_hash_defweak
)
11481 && !bfd_is_abs_section (h
->root
.u
.def
.section
))
11482 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11486 /* Do mark and sweep of unused sections. */
11489 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
11491 bfd_boolean ok
= TRUE
;
11493 elf_gc_mark_hook_fn gc_mark_hook
;
11494 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11496 if (!bed
->can_gc_sections
11497 || !is_elf_hash_table (info
->hash
))
11499 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
11503 bed
->gc_keep (info
);
11505 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11506 at the .eh_frame section if we can mark the FDEs individually. */
11507 _bfd_elf_begin_eh_frame_parsing (info
);
11508 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11511 struct elf_reloc_cookie cookie
;
11513 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
11514 if (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
11516 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
11517 if (elf_section_data (sec
)->sec_info
)
11518 elf_eh_frame_section (sub
) = sec
;
11519 fini_reloc_cookie_for_section (&cookie
, sec
);
11522 _bfd_elf_end_eh_frame_parsing (info
);
11524 /* Apply transitive closure to the vtable entry usage info. */
11525 elf_link_hash_traverse (elf_hash_table (info
),
11526 elf_gc_propagate_vtable_entries_used
,
11531 /* Kill the vtable relocations that were not used. */
11532 elf_link_hash_traverse (elf_hash_table (info
),
11533 elf_gc_smash_unused_vtentry_relocs
,
11538 /* Mark dynamically referenced symbols. */
11539 if (elf_hash_table (info
)->dynamic_sections_created
)
11540 elf_link_hash_traverse (elf_hash_table (info
),
11541 bed
->gc_mark_dynamic_ref
,
11544 /* Grovel through relocs to find out who stays ... */
11545 gc_mark_hook
= bed
->gc_mark_hook
;
11546 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11550 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11553 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11554 if ((o
->flags
& (SEC_EXCLUDE
| SEC_KEEP
)) == SEC_KEEP
&& !o
->gc_mark
)
11555 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
11559 /* Allow the backend to mark additional target specific sections. */
11560 if (bed
->gc_mark_extra_sections
)
11561 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
11563 /* ... and mark SEC_EXCLUDE for those that go. */
11564 return elf_gc_sweep (abfd
, info
);
11567 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11570 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
11572 struct elf_link_hash_entry
*h
,
11575 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
11576 struct elf_link_hash_entry
**search
, *child
;
11577 bfd_size_type extsymcount
;
11578 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11580 /* The sh_info field of the symtab header tells us where the
11581 external symbols start. We don't care about the local symbols at
11583 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
11584 if (!elf_bad_symtab (abfd
))
11585 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
11587 sym_hashes
= elf_sym_hashes (abfd
);
11588 sym_hashes_end
= sym_hashes
+ extsymcount
;
11590 /* Hunt down the child symbol, which is in this section at the same
11591 offset as the relocation. */
11592 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
11594 if ((child
= *search
) != NULL
11595 && (child
->root
.type
== bfd_link_hash_defined
11596 || child
->root
.type
== bfd_link_hash_defweak
)
11597 && child
->root
.u
.def
.section
== sec
11598 && child
->root
.u
.def
.value
== offset
)
11602 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
11603 abfd
, sec
, (unsigned long) offset
);
11604 bfd_set_error (bfd_error_invalid_operation
);
11608 if (!child
->vtable
)
11610 child
->vtable
= bfd_zalloc (abfd
, sizeof (*child
->vtable
));
11611 if (!child
->vtable
)
11616 /* This *should* only be the absolute section. It could potentially
11617 be that someone has defined a non-global vtable though, which
11618 would be bad. It isn't worth paging in the local symbols to be
11619 sure though; that case should simply be handled by the assembler. */
11621 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
11624 child
->vtable
->parent
= h
;
11629 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
11632 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
11633 asection
*sec ATTRIBUTE_UNUSED
,
11634 struct elf_link_hash_entry
*h
,
11637 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11638 unsigned int log_file_align
= bed
->s
->log_file_align
;
11642 h
->vtable
= bfd_zalloc (abfd
, sizeof (*h
->vtable
));
11647 if (addend
>= h
->vtable
->size
)
11649 size_t size
, bytes
, file_align
;
11650 bfd_boolean
*ptr
= h
->vtable
->used
;
11652 /* While the symbol is undefined, we have to be prepared to handle
11654 file_align
= 1 << log_file_align
;
11655 if (h
->root
.type
== bfd_link_hash_undefined
)
11656 size
= addend
+ file_align
;
11660 if (addend
>= size
)
11662 /* Oops! We've got a reference past the defined end of
11663 the table. This is probably a bug -- shall we warn? */
11664 size
= addend
+ file_align
;
11667 size
= (size
+ file_align
- 1) & -file_align
;
11669 /* Allocate one extra entry for use as a "done" flag for the
11670 consolidation pass. */
11671 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
11675 ptr
= bfd_realloc (ptr
- 1, bytes
);
11681 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
11682 * sizeof (bfd_boolean
));
11683 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
11687 ptr
= bfd_zmalloc (bytes
);
11692 /* And arrange for that done flag to be at index -1. */
11693 h
->vtable
->used
= ptr
+ 1;
11694 h
->vtable
->size
= size
;
11697 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
11702 struct alloc_got_off_arg
{
11704 unsigned int got_elt_size
;
11707 /* We need a special top-level link routine to convert got reference counts
11708 to real got offsets. */
11711 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
11713 struct alloc_got_off_arg
*gofarg
= arg
;
11715 if (h
->root
.type
== bfd_link_hash_warning
)
11716 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11718 if (h
->got
.refcount
> 0)
11720 h
->got
.offset
= gofarg
->gotoff
;
11721 gofarg
->gotoff
+= gofarg
->got_elt_size
;
11724 h
->got
.offset
= (bfd_vma
) -1;
11729 /* And an accompanying bit to work out final got entry offsets once
11730 we're done. Should be called from final_link. */
11733 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
11734 struct bfd_link_info
*info
)
11737 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11739 unsigned int got_elt_size
= bed
->s
->arch_size
/ 8;
11740 struct alloc_got_off_arg gofarg
;
11742 if (! is_elf_hash_table (info
->hash
))
11745 /* The GOT offset is relative to the .got section, but the GOT header is
11746 put into the .got.plt section, if the backend uses it. */
11747 if (bed
->want_got_plt
)
11750 gotoff
= bed
->got_header_size
;
11752 /* Do the local .got entries first. */
11753 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
11755 bfd_signed_vma
*local_got
;
11756 bfd_size_type j
, locsymcount
;
11757 Elf_Internal_Shdr
*symtab_hdr
;
11759 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
11762 local_got
= elf_local_got_refcounts (i
);
11766 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
11767 if (elf_bad_symtab (i
))
11768 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11770 locsymcount
= symtab_hdr
->sh_info
;
11772 for (j
= 0; j
< locsymcount
; ++j
)
11774 if (local_got
[j
] > 0)
11776 local_got
[j
] = gotoff
;
11777 gotoff
+= got_elt_size
;
11780 local_got
[j
] = (bfd_vma
) -1;
11784 /* Then the global .got entries. .plt refcounts are handled by
11785 adjust_dynamic_symbol */
11786 gofarg
.gotoff
= gotoff
;
11787 gofarg
.got_elt_size
= got_elt_size
;
11788 elf_link_hash_traverse (elf_hash_table (info
),
11789 elf_gc_allocate_got_offsets
,
11794 /* Many folk need no more in the way of final link than this, once
11795 got entry reference counting is enabled. */
11798 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
11800 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
11803 /* Invoke the regular ELF backend linker to do all the work. */
11804 return bfd_elf_final_link (abfd
, info
);
11808 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
11810 struct elf_reloc_cookie
*rcookie
= cookie
;
11812 if (rcookie
->bad_symtab
)
11813 rcookie
->rel
= rcookie
->rels
;
11815 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
11817 unsigned long r_symndx
;
11819 if (! rcookie
->bad_symtab
)
11820 if (rcookie
->rel
->r_offset
> offset
)
11822 if (rcookie
->rel
->r_offset
!= offset
)
11825 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
11826 if (r_symndx
== SHN_UNDEF
)
11829 if (r_symndx
>= rcookie
->locsymcount
11830 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11832 struct elf_link_hash_entry
*h
;
11834 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
11836 while (h
->root
.type
== bfd_link_hash_indirect
11837 || h
->root
.type
== bfd_link_hash_warning
)
11838 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11840 if ((h
->root
.type
== bfd_link_hash_defined
11841 || h
->root
.type
== bfd_link_hash_defweak
)
11842 && elf_discarded_section (h
->root
.u
.def
.section
))
11849 /* It's not a relocation against a global symbol,
11850 but it could be a relocation against a local
11851 symbol for a discarded section. */
11853 Elf_Internal_Sym
*isym
;
11855 /* Need to: get the symbol; get the section. */
11856 isym
= &rcookie
->locsyms
[r_symndx
];
11857 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
11858 if (isec
!= NULL
&& elf_discarded_section (isec
))
11866 /* Discard unneeded references to discarded sections.
11867 Returns TRUE if any section's size was changed. */
11868 /* This function assumes that the relocations are in sorted order,
11869 which is true for all known assemblers. */
11872 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
11874 struct elf_reloc_cookie cookie
;
11875 asection
*stab
, *eh
;
11876 const struct elf_backend_data
*bed
;
11878 bfd_boolean ret
= FALSE
;
11880 if (info
->traditional_format
11881 || !is_elf_hash_table (info
->hash
))
11884 _bfd_elf_begin_eh_frame_parsing (info
);
11885 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
11887 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
11890 bed
= get_elf_backend_data (abfd
);
11892 if ((abfd
->flags
& DYNAMIC
) != 0)
11896 if (!info
->relocatable
)
11898 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
11901 || bfd_is_abs_section (eh
->output_section
)))
11905 stab
= bfd_get_section_by_name (abfd
, ".stab");
11907 && (stab
->size
== 0
11908 || bfd_is_abs_section (stab
->output_section
)
11909 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
11914 && bed
->elf_backend_discard_info
== NULL
)
11917 if (!init_reloc_cookie (&cookie
, info
, abfd
))
11921 && stab
->reloc_count
> 0
11922 && init_reloc_cookie_rels (&cookie
, info
, abfd
, stab
))
11924 if (_bfd_discard_section_stabs (abfd
, stab
,
11925 elf_section_data (stab
)->sec_info
,
11926 bfd_elf_reloc_symbol_deleted_p
,
11929 fini_reloc_cookie_rels (&cookie
, stab
);
11933 && init_reloc_cookie_rels (&cookie
, info
, abfd
, eh
))
11935 _bfd_elf_parse_eh_frame (abfd
, info
, eh
, &cookie
);
11936 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
11937 bfd_elf_reloc_symbol_deleted_p
,
11940 fini_reloc_cookie_rels (&cookie
, eh
);
11943 if (bed
->elf_backend_discard_info
!= NULL
11944 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
11947 fini_reloc_cookie (&cookie
, abfd
);
11949 _bfd_elf_end_eh_frame_parsing (info
);
11951 if (info
->eh_frame_hdr
11952 && !info
->relocatable
11953 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
11960 _bfd_elf_section_already_linked (bfd
*abfd
, struct bfd_section
*sec
,
11961 struct bfd_link_info
*info
)
11964 const char *name
, *p
;
11965 struct bfd_section_already_linked
*l
;
11966 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
11968 if (sec
->output_section
== bfd_abs_section_ptr
)
11971 flags
= sec
->flags
;
11973 /* Return if it isn't a linkonce section. A comdat group section
11974 also has SEC_LINK_ONCE set. */
11975 if ((flags
& SEC_LINK_ONCE
) == 0)
11978 /* Don't put group member sections on our list of already linked
11979 sections. They are handled as a group via their group section. */
11980 if (elf_sec_group (sec
) != NULL
)
11983 /* FIXME: When doing a relocatable link, we may have trouble
11984 copying relocations in other sections that refer to local symbols
11985 in the section being discarded. Those relocations will have to
11986 be converted somehow; as of this writing I'm not sure that any of
11987 the backends handle that correctly.
11989 It is tempting to instead not discard link once sections when
11990 doing a relocatable link (technically, they should be discarded
11991 whenever we are building constructors). However, that fails,
11992 because the linker winds up combining all the link once sections
11993 into a single large link once section, which defeats the purpose
11994 of having link once sections in the first place.
11996 Also, not merging link once sections in a relocatable link
11997 causes trouble for MIPS ELF, which relies on link once semantics
11998 to handle the .reginfo section correctly. */
12000 name
= bfd_get_section_name (abfd
, sec
);
12002 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
12003 && (p
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
12008 already_linked_list
= bfd_section_already_linked_table_lookup (p
);
12010 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12012 /* We may have 2 different types of sections on the list: group
12013 sections and linkonce sections. Match like sections. */
12014 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
12015 && strcmp (name
, l
->sec
->name
) == 0
12016 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
12018 /* The section has already been linked. See if we should
12019 issue a warning. */
12020 switch (flags
& SEC_LINK_DUPLICATES
)
12025 case SEC_LINK_DUPLICATES_DISCARD
:
12028 case SEC_LINK_DUPLICATES_ONE_ONLY
:
12029 (*_bfd_error_handler
)
12030 (_("%B: ignoring duplicate section `%A'"),
12034 case SEC_LINK_DUPLICATES_SAME_SIZE
:
12035 if (sec
->size
!= l
->sec
->size
)
12036 (*_bfd_error_handler
)
12037 (_("%B: duplicate section `%A' has different size"),
12041 case SEC_LINK_DUPLICATES_SAME_CONTENTS
:
12042 if (sec
->size
!= l
->sec
->size
)
12043 (*_bfd_error_handler
)
12044 (_("%B: duplicate section `%A' has different size"),
12046 else if (sec
->size
!= 0)
12048 bfd_byte
*sec_contents
, *l_sec_contents
;
12050 if (!bfd_malloc_and_get_section (abfd
, sec
, &sec_contents
))
12051 (*_bfd_error_handler
)
12052 (_("%B: warning: could not read contents of section `%A'"),
12054 else if (!bfd_malloc_and_get_section (l
->sec
->owner
, l
->sec
,
12056 (*_bfd_error_handler
)
12057 (_("%B: warning: could not read contents of section `%A'"),
12058 l
->sec
->owner
, l
->sec
);
12059 else if (memcmp (sec_contents
, l_sec_contents
, sec
->size
) != 0)
12060 (*_bfd_error_handler
)
12061 (_("%B: warning: duplicate section `%A' has different contents"),
12065 free (sec_contents
);
12066 if (l_sec_contents
)
12067 free (l_sec_contents
);
12072 /* Set the output_section field so that lang_add_section
12073 does not create a lang_input_section structure for this
12074 section. Since there might be a symbol in the section
12075 being discarded, we must retain a pointer to the section
12076 which we are really going to use. */
12077 sec
->output_section
= bfd_abs_section_ptr
;
12078 sec
->kept_section
= l
->sec
;
12080 if (flags
& SEC_GROUP
)
12082 asection
*first
= elf_next_in_group (sec
);
12083 asection
*s
= first
;
12087 s
->output_section
= bfd_abs_section_ptr
;
12088 /* Record which group discards it. */
12089 s
->kept_section
= l
->sec
;
12090 s
= elf_next_in_group (s
);
12091 /* These lists are circular. */
12101 /* A single member comdat group section may be discarded by a
12102 linkonce section and vice versa. */
12104 if ((flags
& SEC_GROUP
) != 0)
12106 asection
*first
= elf_next_in_group (sec
);
12108 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
12109 /* Check this single member group against linkonce sections. */
12110 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12111 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12112 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
12113 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
12115 first
->output_section
= bfd_abs_section_ptr
;
12116 first
->kept_section
= l
->sec
;
12117 sec
->output_section
= bfd_abs_section_ptr
;
12122 /* Check this linkonce section against single member groups. */
12123 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12124 if (l
->sec
->flags
& SEC_GROUP
)
12126 asection
*first
= elf_next_in_group (l
->sec
);
12129 && elf_next_in_group (first
) == first
12130 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
12132 sec
->output_section
= bfd_abs_section_ptr
;
12133 sec
->kept_section
= first
;
12138 /* This is the first section with this name. Record it. */
12139 if (! bfd_section_already_linked_table_insert (already_linked_list
, sec
))
12140 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E"));
12144 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
12146 return sym
->st_shndx
== SHN_COMMON
;
12150 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
12156 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
12158 return bfd_com_section_ptr
;