1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
35 struct elf_link_hash_entry
*h
;
36 struct bfd_link_hash_entry
*bh
;
37 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
40 /* This function may be called more than once. */
41 s
= bfd_get_section_by_name (abfd
, ".got");
42 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
45 switch (bed
->s
->arch_size
)
56 bfd_set_error (bfd_error_bad_value
);
60 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
61 | SEC_LINKER_CREATED
);
63 s
= bfd_make_section (abfd
, ".got");
65 || !bfd_set_section_flags (abfd
, s
, flags
)
66 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
69 if (bed
->want_got_plt
)
71 s
= bfd_make_section (abfd
, ".got.plt");
73 || !bfd_set_section_flags (abfd
, s
, flags
)
74 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
78 if (bed
->want_got_sym
)
80 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
81 (or .got.plt) section. We don't do this in the linker script
82 because we don't want to define the symbol if we are not creating
83 a global offset table. */
85 if (!(_bfd_generic_link_add_one_symbol
86 (info
, abfd
, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL
, s
,
87 bed
->got_symbol_offset
, NULL
, FALSE
, bed
->collect
, &bh
)))
89 h
= (struct elf_link_hash_entry
*) bh
;
90 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
93 if (! info
->executable
94 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
97 elf_hash_table (info
)->hgot
= h
;
100 /* The first bit of the global offset table is the header. */
101 s
->size
+= bed
->got_header_size
+ bed
->got_symbol_offset
;
106 /* Create some sections which will be filled in with dynamic linking
107 information. ABFD is an input file which requires dynamic sections
108 to be created. The dynamic sections take up virtual memory space
109 when the final executable is run, so we need to create them before
110 addresses are assigned to the output sections. We work out the
111 actual contents and size of these sections later. */
114 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
117 register asection
*s
;
118 struct elf_link_hash_entry
*h
;
119 struct bfd_link_hash_entry
*bh
;
120 const struct elf_backend_data
*bed
;
122 if (! is_elf_hash_table (info
->hash
))
125 if (elf_hash_table (info
)->dynamic_sections_created
)
128 /* Make sure that all dynamic sections use the same input BFD. */
129 if (elf_hash_table (info
)->dynobj
== NULL
)
130 elf_hash_table (info
)->dynobj
= abfd
;
132 abfd
= elf_hash_table (info
)->dynobj
;
134 /* Note that we set the SEC_IN_MEMORY flag for all of these
136 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
137 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
139 /* A dynamically linked executable has a .interp section, but a
140 shared library does not. */
141 if (info
->executable
)
143 s
= bfd_make_section (abfd
, ".interp");
145 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
149 if (! info
->traditional_format
)
151 s
= bfd_make_section (abfd
, ".eh_frame_hdr");
153 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
154 || ! bfd_set_section_alignment (abfd
, s
, 2))
156 elf_hash_table (info
)->eh_info
.hdr_sec
= s
;
159 bed
= get_elf_backend_data (abfd
);
161 /* Create sections to hold version informations. These are removed
162 if they are not needed. */
163 s
= bfd_make_section (abfd
, ".gnu.version_d");
165 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
166 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
169 s
= bfd_make_section (abfd
, ".gnu.version");
171 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
172 || ! bfd_set_section_alignment (abfd
, s
, 1))
175 s
= bfd_make_section (abfd
, ".gnu.version_r");
177 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
178 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
181 s
= bfd_make_section (abfd
, ".dynsym");
183 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
184 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
187 s
= bfd_make_section (abfd
, ".dynstr");
189 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
192 /* Create a strtab to hold the dynamic symbol names. */
193 if (elf_hash_table (info
)->dynstr
== NULL
)
195 elf_hash_table (info
)->dynstr
= _bfd_elf_strtab_init ();
196 if (elf_hash_table (info
)->dynstr
== NULL
)
200 s
= bfd_make_section (abfd
, ".dynamic");
202 || ! bfd_set_section_flags (abfd
, s
, flags
)
203 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
206 /* The special symbol _DYNAMIC is always set to the start of the
207 .dynamic section. This call occurs before we have processed the
208 symbols for any dynamic object, so we don't have to worry about
209 overriding a dynamic definition. We could set _DYNAMIC in a
210 linker script, but we only want to define it if we are, in fact,
211 creating a .dynamic section. We don't want to define it if there
212 is no .dynamic section, since on some ELF platforms the start up
213 code examines it to decide how to initialize the process. */
215 if (! (_bfd_generic_link_add_one_symbol
216 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, 0, NULL
, FALSE
,
217 get_elf_backend_data (abfd
)->collect
, &bh
)))
219 h
= (struct elf_link_hash_entry
*) bh
;
220 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
221 h
->type
= STT_OBJECT
;
223 if (! info
->executable
224 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
227 s
= bfd_make_section (abfd
, ".hash");
229 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
230 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
232 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
234 /* Let the backend create the rest of the sections. This lets the
235 backend set the right flags. The backend will normally create
236 the .got and .plt sections. */
237 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
240 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
245 /* Create dynamic sections when linking against a dynamic object. */
248 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
250 flagword flags
, pltflags
;
252 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
254 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
255 .rel[a].bss sections. */
257 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
258 | SEC_LINKER_CREATED
);
261 pltflags
|= SEC_CODE
;
262 if (bed
->plt_not_loaded
)
263 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
264 if (bed
->plt_readonly
)
265 pltflags
|= SEC_READONLY
;
267 s
= bfd_make_section (abfd
, ".plt");
269 || ! bfd_set_section_flags (abfd
, s
, pltflags
)
270 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
273 if (bed
->want_plt_sym
)
275 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
277 struct elf_link_hash_entry
*h
;
278 struct bfd_link_hash_entry
*bh
= NULL
;
280 if (! (_bfd_generic_link_add_one_symbol
281 (info
, abfd
, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL
, s
, 0, NULL
,
282 FALSE
, get_elf_backend_data (abfd
)->collect
, &bh
)))
284 h
= (struct elf_link_hash_entry
*) bh
;
285 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
286 h
->type
= STT_OBJECT
;
288 if (! info
->executable
289 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
293 s
= bfd_make_section (abfd
,
294 bed
->default_use_rela_p
? ".rela.plt" : ".rel.plt");
296 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
297 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
300 if (! _bfd_elf_create_got_section (abfd
, info
))
303 if (bed
->want_dynbss
)
305 /* The .dynbss section is a place to put symbols which are defined
306 by dynamic objects, are referenced by regular objects, and are
307 not functions. We must allocate space for them in the process
308 image and use a R_*_COPY reloc to tell the dynamic linker to
309 initialize them at run time. The linker script puts the .dynbss
310 section into the .bss section of the final image. */
311 s
= bfd_make_section (abfd
, ".dynbss");
313 || ! bfd_set_section_flags (abfd
, s
, SEC_ALLOC
| SEC_LINKER_CREATED
))
316 /* The .rel[a].bss section holds copy relocs. This section is not
317 normally needed. We need to create it here, though, so that the
318 linker will map it to an output section. We can't just create it
319 only if we need it, because we will not know whether we need it
320 until we have seen all the input files, and the first time the
321 main linker code calls BFD after examining all the input files
322 (size_dynamic_sections) the input sections have already been
323 mapped to the output sections. If the section turns out not to
324 be needed, we can discard it later. We will never need this
325 section when generating a shared object, since they do not use
329 s
= bfd_make_section (abfd
,
330 (bed
->default_use_rela_p
331 ? ".rela.bss" : ".rel.bss"));
333 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
334 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
342 /* Record a new dynamic symbol. We record the dynamic symbols as we
343 read the input files, since we need to have a list of all of them
344 before we can determine the final sizes of the output sections.
345 Note that we may actually call this function even though we are not
346 going to output any dynamic symbols; in some cases we know that a
347 symbol should be in the dynamic symbol table, but only if there is
351 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
352 struct elf_link_hash_entry
*h
)
354 if (h
->dynindx
== -1)
356 struct elf_strtab_hash
*dynstr
;
361 /* XXX: The ABI draft says the linker must turn hidden and
362 internal symbols into STB_LOCAL symbols when producing the
363 DSO. However, if ld.so honors st_other in the dynamic table,
364 this would not be necessary. */
365 switch (ELF_ST_VISIBILITY (h
->other
))
369 if (h
->root
.type
!= bfd_link_hash_undefined
370 && h
->root
.type
!= bfd_link_hash_undefweak
)
372 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
380 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
381 ++elf_hash_table (info
)->dynsymcount
;
383 dynstr
= elf_hash_table (info
)->dynstr
;
386 /* Create a strtab to hold the dynamic symbol names. */
387 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
392 /* We don't put any version information in the dynamic string
394 name
= h
->root
.root
.string
;
395 p
= strchr (name
, ELF_VER_CHR
);
397 /* We know that the p points into writable memory. In fact,
398 there are only a few symbols that have read-only names, being
399 those like _GLOBAL_OFFSET_TABLE_ that are created specially
400 by the backends. Most symbols will have names pointing into
401 an ELF string table read from a file, or to objalloc memory. */
404 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
409 if (indx
== (bfd_size_type
) -1)
411 h
->dynstr_index
= indx
;
417 /* Record an assignment to a symbol made by a linker script. We need
418 this in case some dynamic object refers to this symbol. */
421 bfd_elf_record_link_assignment (bfd
*output_bfd ATTRIBUTE_UNUSED
,
422 struct bfd_link_info
*info
,
426 struct elf_link_hash_entry
*h
;
428 if (!is_elf_hash_table (info
->hash
))
431 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, TRUE
, FALSE
);
435 /* Since we're defining the symbol, don't let it seem to have not
436 been defined. record_dynamic_symbol and size_dynamic_sections
437 may depend on this. */
438 if (h
->root
.type
== bfd_link_hash_undefweak
439 || h
->root
.type
== bfd_link_hash_undefined
)
440 h
->root
.type
= bfd_link_hash_new
;
442 if (h
->root
.type
== bfd_link_hash_new
)
443 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_ELF
;
445 /* If this symbol is being provided by the linker script, and it is
446 currently defined by a dynamic object, but not by a regular
447 object, then mark it as undefined so that the generic linker will
448 force the correct value. */
450 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
451 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
452 h
->root
.type
= bfd_link_hash_undefined
;
454 /* If this symbol is not being provided by the linker script, and it is
455 currently defined by a dynamic object, but not by a regular object,
456 then clear out any version information because the symbol will not be
457 associated with the dynamic object any more. */
459 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
460 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
461 h
->verinfo
.verdef
= NULL
;
463 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
465 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
466 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
470 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
473 /* If this is a weak defined symbol, and we know a corresponding
474 real symbol from the same dynamic object, make sure the real
475 symbol is also made into a dynamic symbol. */
476 if (h
->weakdef
!= NULL
477 && h
->weakdef
->dynindx
== -1)
479 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
487 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
488 success, and 2 on a failure caused by attempting to record a symbol
489 in a discarded section, eg. a discarded link-once section symbol. */
492 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
497 struct elf_link_local_dynamic_entry
*entry
;
498 struct elf_link_hash_table
*eht
;
499 struct elf_strtab_hash
*dynstr
;
500 unsigned long dynstr_index
;
502 Elf_External_Sym_Shndx eshndx
;
503 char esym
[sizeof (Elf64_External_Sym
)];
505 if (! is_elf_hash_table (info
->hash
))
508 /* See if the entry exists already. */
509 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
510 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
513 amt
= sizeof (*entry
);
514 entry
= bfd_alloc (input_bfd
, amt
);
518 /* Go find the symbol, so that we can find it's name. */
519 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
520 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
522 bfd_release (input_bfd
, entry
);
526 if (entry
->isym
.st_shndx
!= SHN_UNDEF
527 && (entry
->isym
.st_shndx
< SHN_LORESERVE
528 || entry
->isym
.st_shndx
> SHN_HIRESERVE
))
532 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
533 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
535 /* We can still bfd_release here as nothing has done another
536 bfd_alloc. We can't do this later in this function. */
537 bfd_release (input_bfd
, entry
);
542 name
= (bfd_elf_string_from_elf_section
543 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
544 entry
->isym
.st_name
));
546 dynstr
= elf_hash_table (info
)->dynstr
;
549 /* Create a strtab to hold the dynamic symbol names. */
550 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
555 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
556 if (dynstr_index
== (unsigned long) -1)
558 entry
->isym
.st_name
= dynstr_index
;
560 eht
= elf_hash_table (info
);
562 entry
->next
= eht
->dynlocal
;
563 eht
->dynlocal
= entry
;
564 entry
->input_bfd
= input_bfd
;
565 entry
->input_indx
= input_indx
;
568 /* Whatever binding the symbol had before, it's now local. */
570 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
572 /* The dynindx will be set at the end of size_dynamic_sections. */
577 /* Return the dynindex of a local dynamic symbol. */
580 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
584 struct elf_link_local_dynamic_entry
*e
;
586 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
587 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
592 /* This function is used to renumber the dynamic symbols, if some of
593 them are removed because they are marked as local. This is called
594 via elf_link_hash_traverse. */
597 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
600 size_t *count
= data
;
602 if (h
->root
.type
== bfd_link_hash_warning
)
603 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
605 if (h
->dynindx
!= -1)
606 h
->dynindx
= ++(*count
);
611 /* Return true if the dynamic symbol for a given section should be
612 omitted when creating a shared library. */
614 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
615 struct bfd_link_info
*info
,
618 switch (elf_section_data (p
)->this_hdr
.sh_type
)
622 /* If sh_type is yet undecided, assume it could be
623 SHT_PROGBITS/SHT_NOBITS. */
625 if (strcmp (p
->name
, ".got") == 0
626 || strcmp (p
->name
, ".got.plt") == 0
627 || strcmp (p
->name
, ".plt") == 0)
630 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
633 && (ip
= bfd_get_section_by_name (dynobj
, p
->name
))
635 && (ip
->flags
& SEC_LINKER_CREATED
)
636 && ip
->output_section
== p
)
641 /* There shouldn't be section relative relocations
642 against any other section. */
648 /* Assign dynsym indices. In a shared library we generate a section
649 symbol for each output section, which come first. Next come all of
650 the back-end allocated local dynamic syms, followed by the rest of
651 the global symbols. */
654 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
, struct bfd_link_info
*info
)
656 unsigned long dynsymcount
= 0;
660 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
662 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
663 if ((p
->flags
& SEC_EXCLUDE
) == 0
664 && (p
->flags
& SEC_ALLOC
) != 0
665 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
666 elf_section_data (p
)->dynindx
= ++dynsymcount
;
669 if (elf_hash_table (info
)->dynlocal
)
671 struct elf_link_local_dynamic_entry
*p
;
672 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
673 p
->dynindx
= ++dynsymcount
;
676 elf_link_hash_traverse (elf_hash_table (info
),
677 elf_link_renumber_hash_table_dynsyms
,
680 /* There is an unused NULL entry at the head of the table which
681 we must account for in our count. Unless there weren't any
682 symbols, which means we'll have no table at all. */
683 if (dynsymcount
!= 0)
686 return elf_hash_table (info
)->dynsymcount
= dynsymcount
;
689 /* This function is called when we want to define a new symbol. It
690 handles the various cases which arise when we find a definition in
691 a dynamic object, or when there is already a definition in a
692 dynamic object. The new symbol is described by NAME, SYM, PSEC,
693 and PVALUE. We set SYM_HASH to the hash table entry. We set
694 OVERRIDE if the old symbol is overriding a new definition. We set
695 TYPE_CHANGE_OK if it is OK for the type to change. We set
696 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
697 change, we mean that we shouldn't warn if the type or size does
701 _bfd_elf_merge_symbol (bfd
*abfd
,
702 struct bfd_link_info
*info
,
704 Elf_Internal_Sym
*sym
,
707 struct elf_link_hash_entry
**sym_hash
,
709 bfd_boolean
*override
,
710 bfd_boolean
*type_change_ok
,
711 bfd_boolean
*size_change_ok
)
714 struct elf_link_hash_entry
*h
;
715 struct elf_link_hash_entry
*flip
;
718 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
719 bfd_boolean newweak
, oldweak
;
725 bind
= ELF_ST_BIND (sym
->st_info
);
727 if (! bfd_is_und_section (sec
))
728 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
730 h
= ((struct elf_link_hash_entry
*)
731 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
736 /* This code is for coping with dynamic objects, and is only useful
737 if we are doing an ELF link. */
738 if (info
->hash
->creator
!= abfd
->xvec
)
741 /* For merging, we only care about real symbols. */
743 while (h
->root
.type
== bfd_link_hash_indirect
744 || h
->root
.type
== bfd_link_hash_warning
)
745 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
747 /* If we just created the symbol, mark it as being an ELF symbol.
748 Other than that, there is nothing to do--there is no merge issue
749 with a newly defined symbol--so we just return. */
751 if (h
->root
.type
== bfd_link_hash_new
)
753 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
757 /* OLDBFD is a BFD associated with the existing symbol. */
759 switch (h
->root
.type
)
765 case bfd_link_hash_undefined
:
766 case bfd_link_hash_undefweak
:
767 oldbfd
= h
->root
.u
.undef
.abfd
;
770 case bfd_link_hash_defined
:
771 case bfd_link_hash_defweak
:
772 oldbfd
= h
->root
.u
.def
.section
->owner
;
775 case bfd_link_hash_common
:
776 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
780 /* In cases involving weak versioned symbols, we may wind up trying
781 to merge a symbol with itself. Catch that here, to avoid the
782 confusion that results if we try to override a symbol with
783 itself. The additional tests catch cases like
784 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
785 dynamic object, which we do want to handle here. */
787 && ((abfd
->flags
& DYNAMIC
) == 0
788 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
791 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
792 respectively, is from a dynamic object. */
794 if ((abfd
->flags
& DYNAMIC
) != 0)
800 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
805 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
806 indices used by MIPS ELF. */
807 switch (h
->root
.type
)
813 case bfd_link_hash_defined
:
814 case bfd_link_hash_defweak
:
815 hsec
= h
->root
.u
.def
.section
;
818 case bfd_link_hash_common
:
819 hsec
= h
->root
.u
.c
.p
->section
;
826 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
829 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
830 respectively, appear to be a definition rather than reference. */
832 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
837 if (h
->root
.type
== bfd_link_hash_undefined
838 || h
->root
.type
== bfd_link_hash_undefweak
839 || h
->root
.type
== bfd_link_hash_common
)
844 /* We need to remember if a symbol has a definition in a dynamic
845 object or is weak in all dynamic objects. Internal and hidden
846 visibility will make it unavailable to dynamic objects. */
847 if (newdyn
&& (h
->elf_link_hash_flags
& ELF_LINK_DYNAMIC_DEF
) == 0)
849 if (!bfd_is_und_section (sec
))
850 h
->elf_link_hash_flags
|= ELF_LINK_DYNAMIC_DEF
;
853 /* Check if this symbol is weak in all dynamic objects. If it
854 is the first time we see it in a dynamic object, we mark
855 if it is weak. Otherwise, we clear it. */
856 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) == 0)
858 if (bind
== STB_WEAK
)
859 h
->elf_link_hash_flags
|= ELF_LINK_DYNAMIC_WEAK
;
861 else if (bind
!= STB_WEAK
)
862 h
->elf_link_hash_flags
&= ~ELF_LINK_DYNAMIC_WEAK
;
866 /* If the old symbol has non-default visibility, we ignore the new
867 definition from a dynamic object. */
869 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
870 && !bfd_is_und_section (sec
))
873 /* Make sure this symbol is dynamic. */
874 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
875 /* A protected symbol has external availability. Make sure it is
878 FIXME: Should we check type and size for protected symbol? */
879 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
880 return bfd_elf_link_record_dynamic_symbol (info
, h
);
885 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
886 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
888 /* If the new symbol with non-default visibility comes from a
889 relocatable file and the old definition comes from a dynamic
890 object, we remove the old definition. */
891 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
894 if ((h
->root
.und_next
|| info
->hash
->undefs_tail
== &h
->root
)
895 && bfd_is_und_section (sec
))
897 /* If the new symbol is undefined and the old symbol was
898 also undefined before, we need to make sure
899 _bfd_generic_link_add_one_symbol doesn't mess
900 up the linker hash table undefs list. Since the old
901 definition came from a dynamic object, it is still on the
903 h
->root
.type
= bfd_link_hash_undefined
;
904 /* FIXME: What if the new symbol is weak undefined? */
905 h
->root
.u
.undef
.abfd
= abfd
;
909 h
->root
.type
= bfd_link_hash_new
;
910 h
->root
.u
.undef
.abfd
= NULL
;
913 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
915 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_DEF_DYNAMIC
;
916 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_DYNAMIC
917 | ELF_LINK_DYNAMIC_DEF
);
919 /* FIXME: Should we check type and size for protected symbol? */
925 /* Differentiate strong and weak symbols. */
926 newweak
= bind
== STB_WEAK
;
927 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
928 || h
->root
.type
== bfd_link_hash_undefweak
);
930 /* If a new weak symbol definition comes from a regular file and the
931 old symbol comes from a dynamic library, we treat the new one as
932 strong. Similarly, an old weak symbol definition from a regular
933 file is treated as strong when the new symbol comes from a dynamic
934 library. Further, an old weak symbol from a dynamic library is
935 treated as strong if the new symbol is from a dynamic library.
936 This reflects the way glibc's ld.so works.
938 Do this before setting *type_change_ok or *size_change_ok so that
939 we warn properly when dynamic library symbols are overridden. */
941 if (newdef
&& !newdyn
&& olddyn
)
943 if (olddef
&& newdyn
)
946 /* It's OK to change the type if either the existing symbol or the
947 new symbol is weak. A type change is also OK if the old symbol
948 is undefined and the new symbol is defined. */
953 && h
->root
.type
== bfd_link_hash_undefined
))
954 *type_change_ok
= TRUE
;
956 /* It's OK to change the size if either the existing symbol or the
957 new symbol is weak, or if the old symbol is undefined. */
960 || h
->root
.type
== bfd_link_hash_undefined
)
961 *size_change_ok
= TRUE
;
963 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
964 symbol, respectively, appears to be a common symbol in a dynamic
965 object. If a symbol appears in an uninitialized section, and is
966 not weak, and is not a function, then it may be a common symbol
967 which was resolved when the dynamic object was created. We want
968 to treat such symbols specially, because they raise special
969 considerations when setting the symbol size: if the symbol
970 appears as a common symbol in a regular object, and the size in
971 the regular object is larger, we must make sure that we use the
972 larger size. This problematic case can always be avoided in C,
973 but it must be handled correctly when using Fortran shared
976 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
977 likewise for OLDDYNCOMMON and OLDDEF.
979 Note that this test is just a heuristic, and that it is quite
980 possible to have an uninitialized symbol in a shared object which
981 is really a definition, rather than a common symbol. This could
982 lead to some minor confusion when the symbol really is a common
983 symbol in some regular object. However, I think it will be
989 && (sec
->flags
& SEC_ALLOC
) != 0
990 && (sec
->flags
& SEC_LOAD
) == 0
992 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
995 newdyncommon
= FALSE
;
999 && h
->root
.type
== bfd_link_hash_defined
1000 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1001 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1002 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1004 && h
->type
!= STT_FUNC
)
1005 olddyncommon
= TRUE
;
1007 olddyncommon
= FALSE
;
1009 /* If both the old and the new symbols look like common symbols in a
1010 dynamic object, set the size of the symbol to the larger of the
1015 && sym
->st_size
!= h
->size
)
1017 /* Since we think we have two common symbols, issue a multiple
1018 common warning if desired. Note that we only warn if the
1019 size is different. If the size is the same, we simply let
1020 the old symbol override the new one as normally happens with
1021 symbols defined in dynamic objects. */
1023 if (! ((*info
->callbacks
->multiple_common
)
1024 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1025 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1028 if (sym
->st_size
> h
->size
)
1029 h
->size
= sym
->st_size
;
1031 *size_change_ok
= TRUE
;
1034 /* If we are looking at a dynamic object, and we have found a
1035 definition, we need to see if the symbol was already defined by
1036 some other object. If so, we want to use the existing
1037 definition, and we do not want to report a multiple symbol
1038 definition error; we do this by clobbering *PSEC to be
1039 bfd_und_section_ptr.
1041 We treat a common symbol as a definition if the symbol in the
1042 shared library is a function, since common symbols always
1043 represent variables; this can cause confusion in principle, but
1044 any such confusion would seem to indicate an erroneous program or
1045 shared library. We also permit a common symbol in a regular
1046 object to override a weak symbol in a shared object. */
1051 || (h
->root
.type
== bfd_link_hash_common
1053 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
1057 newdyncommon
= FALSE
;
1059 *psec
= sec
= bfd_und_section_ptr
;
1060 *size_change_ok
= TRUE
;
1062 /* If we get here when the old symbol is a common symbol, then
1063 we are explicitly letting it override a weak symbol or
1064 function in a dynamic object, and we don't want to warn about
1065 a type change. If the old symbol is a defined symbol, a type
1066 change warning may still be appropriate. */
1068 if (h
->root
.type
== bfd_link_hash_common
)
1069 *type_change_ok
= TRUE
;
1072 /* Handle the special case of an old common symbol merging with a
1073 new symbol which looks like a common symbol in a shared object.
1074 We change *PSEC and *PVALUE to make the new symbol look like a
1075 common symbol, and let _bfd_generic_link_add_one_symbol will do
1079 && h
->root
.type
== bfd_link_hash_common
)
1083 newdyncommon
= FALSE
;
1084 *pvalue
= sym
->st_size
;
1085 *psec
= sec
= bfd_com_section_ptr
;
1086 *size_change_ok
= TRUE
;
1089 /* If the old symbol is from a dynamic object, and the new symbol is
1090 a definition which is not from a dynamic object, then the new
1091 symbol overrides the old symbol. Symbols from regular files
1092 always take precedence over symbols from dynamic objects, even if
1093 they are defined after the dynamic object in the link.
1095 As above, we again permit a common symbol in a regular object to
1096 override a definition in a shared object if the shared object
1097 symbol is a function or is weak. */
1102 || (bfd_is_com_section (sec
)
1104 || h
->type
== STT_FUNC
)))
1107 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
1109 /* Change the hash table entry to undefined, and let
1110 _bfd_generic_link_add_one_symbol do the right thing with the
1113 h
->root
.type
= bfd_link_hash_undefined
;
1114 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1115 *size_change_ok
= TRUE
;
1118 olddyncommon
= FALSE
;
1120 /* We again permit a type change when a common symbol may be
1121 overriding a function. */
1123 if (bfd_is_com_section (sec
))
1124 *type_change_ok
= TRUE
;
1126 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1129 /* This union may have been set to be non-NULL when this symbol
1130 was seen in a dynamic object. We must force the union to be
1131 NULL, so that it is correct for a regular symbol. */
1132 h
->verinfo
.vertree
= NULL
;
1135 /* Handle the special case of a new common symbol merging with an
1136 old symbol that looks like it might be a common symbol defined in
1137 a shared object. Note that we have already handled the case in
1138 which a new common symbol should simply override the definition
1139 in the shared library. */
1142 && bfd_is_com_section (sec
)
1145 /* It would be best if we could set the hash table entry to a
1146 common symbol, but we don't know what to use for the section
1147 or the alignment. */
1148 if (! ((*info
->callbacks
->multiple_common
)
1149 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1150 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1153 /* If the presumed common symbol in the dynamic object is
1154 larger, pretend that the new symbol has its size. */
1156 if (h
->size
> *pvalue
)
1159 /* FIXME: We no longer know the alignment required by the symbol
1160 in the dynamic object, so we just wind up using the one from
1161 the regular object. */
1164 olddyncommon
= FALSE
;
1166 h
->root
.type
= bfd_link_hash_undefined
;
1167 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1169 *size_change_ok
= TRUE
;
1170 *type_change_ok
= TRUE
;
1172 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1175 h
->verinfo
.vertree
= NULL
;
1180 /* Handle the case where we had a versioned symbol in a dynamic
1181 library and now find a definition in a normal object. In this
1182 case, we make the versioned symbol point to the normal one. */
1183 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1184 flip
->root
.type
= h
->root
.type
;
1185 h
->root
.type
= bfd_link_hash_indirect
;
1186 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1187 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, flip
, h
);
1188 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1189 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1191 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_DEF_DYNAMIC
;
1192 flip
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1199 /* This function is called to create an indirect symbol from the
1200 default for the symbol with the default version if needed. The
1201 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1202 set DYNSYM if the new indirect symbol is dynamic. */
1205 _bfd_elf_add_default_symbol (bfd
*abfd
,
1206 struct bfd_link_info
*info
,
1207 struct elf_link_hash_entry
*h
,
1209 Elf_Internal_Sym
*sym
,
1212 bfd_boolean
*dynsym
,
1213 bfd_boolean override
)
1215 bfd_boolean type_change_ok
;
1216 bfd_boolean size_change_ok
;
1219 struct elf_link_hash_entry
*hi
;
1220 struct bfd_link_hash_entry
*bh
;
1221 const struct elf_backend_data
*bed
;
1222 bfd_boolean collect
;
1223 bfd_boolean dynamic
;
1225 size_t len
, shortlen
;
1228 /* If this symbol has a version, and it is the default version, we
1229 create an indirect symbol from the default name to the fully
1230 decorated name. This will cause external references which do not
1231 specify a version to be bound to this version of the symbol. */
1232 p
= strchr (name
, ELF_VER_CHR
);
1233 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1238 /* We are overridden by an old definition. We need to check if we
1239 need to create the indirect symbol from the default name. */
1240 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1242 BFD_ASSERT (hi
!= NULL
);
1245 while (hi
->root
.type
== bfd_link_hash_indirect
1246 || hi
->root
.type
== bfd_link_hash_warning
)
1248 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1254 bed
= get_elf_backend_data (abfd
);
1255 collect
= bed
->collect
;
1256 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1258 shortlen
= p
- name
;
1259 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1260 if (shortname
== NULL
)
1262 memcpy (shortname
, name
, shortlen
);
1263 shortname
[shortlen
] = '\0';
1265 /* We are going to create a new symbol. Merge it with any existing
1266 symbol with this name. For the purposes of the merge, act as
1267 though we were defining the symbol we just defined, although we
1268 actually going to define an indirect symbol. */
1269 type_change_ok
= FALSE
;
1270 size_change_ok
= FALSE
;
1272 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1273 &hi
, &skip
, &override
, &type_change_ok
,
1283 if (! (_bfd_generic_link_add_one_symbol
1284 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1285 0, name
, FALSE
, collect
, &bh
)))
1287 hi
= (struct elf_link_hash_entry
*) bh
;
1291 /* In this case the symbol named SHORTNAME is overriding the
1292 indirect symbol we want to add. We were planning on making
1293 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1294 is the name without a version. NAME is the fully versioned
1295 name, and it is the default version.
1297 Overriding means that we already saw a definition for the
1298 symbol SHORTNAME in a regular object, and it is overriding
1299 the symbol defined in the dynamic object.
1301 When this happens, we actually want to change NAME, the
1302 symbol we just added, to refer to SHORTNAME. This will cause
1303 references to NAME in the shared object to become references
1304 to SHORTNAME in the regular object. This is what we expect
1305 when we override a function in a shared object: that the
1306 references in the shared object will be mapped to the
1307 definition in the regular object. */
1309 while (hi
->root
.type
== bfd_link_hash_indirect
1310 || hi
->root
.type
== bfd_link_hash_warning
)
1311 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1313 h
->root
.type
= bfd_link_hash_indirect
;
1314 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1315 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1317 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1318 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1319 if (hi
->elf_link_hash_flags
1320 & (ELF_LINK_HASH_REF_REGULAR
1321 | ELF_LINK_HASH_DEF_REGULAR
))
1323 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1328 /* Now set HI to H, so that the following code will set the
1329 other fields correctly. */
1333 /* If there is a duplicate definition somewhere, then HI may not
1334 point to an indirect symbol. We will have reported an error to
1335 the user in that case. */
1337 if (hi
->root
.type
== bfd_link_hash_indirect
)
1339 struct elf_link_hash_entry
*ht
;
1341 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1342 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, ht
, hi
);
1344 /* See if the new flags lead us to realize that the symbol must
1351 || ((hi
->elf_link_hash_flags
1352 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1357 if ((hi
->elf_link_hash_flags
1358 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1364 /* We also need to define an indirection from the nondefault version
1368 len
= strlen (name
);
1369 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1370 if (shortname
== NULL
)
1372 memcpy (shortname
, name
, shortlen
);
1373 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1375 /* Once again, merge with any existing symbol. */
1376 type_change_ok
= FALSE
;
1377 size_change_ok
= FALSE
;
1379 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1380 &hi
, &skip
, &override
, &type_change_ok
,
1389 /* Here SHORTNAME is a versioned name, so we don't expect to see
1390 the type of override we do in the case above unless it is
1391 overridden by a versioned definition. */
1392 if (hi
->root
.type
!= bfd_link_hash_defined
1393 && hi
->root
.type
!= bfd_link_hash_defweak
)
1394 (*_bfd_error_handler
)
1395 (_("%s: warning: unexpected redefinition of indirect versioned symbol `%s'"),
1396 bfd_archive_filename (abfd
), shortname
);
1401 if (! (_bfd_generic_link_add_one_symbol
1402 (info
, abfd
, shortname
, BSF_INDIRECT
,
1403 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1405 hi
= (struct elf_link_hash_entry
*) bh
;
1407 /* If there is a duplicate definition somewhere, then HI may not
1408 point to an indirect symbol. We will have reported an error
1409 to the user in that case. */
1411 if (hi
->root
.type
== bfd_link_hash_indirect
)
1413 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
1415 /* See if the new flags lead us to realize that the symbol
1422 || ((hi
->elf_link_hash_flags
1423 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1428 if ((hi
->elf_link_hash_flags
1429 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1439 /* This routine is used to export all defined symbols into the dynamic
1440 symbol table. It is called via elf_link_hash_traverse. */
1443 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1445 struct elf_info_failed
*eif
= data
;
1447 /* Ignore indirect symbols. These are added by the versioning code. */
1448 if (h
->root
.type
== bfd_link_hash_indirect
)
1451 if (h
->root
.type
== bfd_link_hash_warning
)
1452 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1454 if (h
->dynindx
== -1
1455 && (h
->elf_link_hash_flags
1456 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
1458 struct bfd_elf_version_tree
*t
;
1459 struct bfd_elf_version_expr
*d
;
1461 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
1463 if (t
->globals
.list
!= NULL
)
1465 d
= (*t
->match
) (&t
->globals
, NULL
, h
->root
.root
.string
);
1470 if (t
->locals
.list
!= NULL
)
1472 d
= (*t
->match
) (&t
->locals
, NULL
, h
->root
.root
.string
);
1481 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1492 /* Look through the symbols which are defined in other shared
1493 libraries and referenced here. Update the list of version
1494 dependencies. This will be put into the .gnu.version_r section.
1495 This function is called via elf_link_hash_traverse. */
1498 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1501 struct elf_find_verdep_info
*rinfo
= data
;
1502 Elf_Internal_Verneed
*t
;
1503 Elf_Internal_Vernaux
*a
;
1506 if (h
->root
.type
== bfd_link_hash_warning
)
1507 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1509 /* We only care about symbols defined in shared objects with version
1511 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1512 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
1514 || h
->verinfo
.verdef
== NULL
)
1517 /* See if we already know about this version. */
1518 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
1520 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1523 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1524 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1530 /* This is a new version. Add it to tree we are building. */
1535 t
= bfd_zalloc (rinfo
->output_bfd
, amt
);
1538 rinfo
->failed
= TRUE
;
1542 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1543 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
1544 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
1548 a
= bfd_zalloc (rinfo
->output_bfd
, amt
);
1550 /* Note that we are copying a string pointer here, and testing it
1551 above. If bfd_elf_string_from_elf_section is ever changed to
1552 discard the string data when low in memory, this will have to be
1554 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1556 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1557 a
->vna_nextptr
= t
->vn_auxptr
;
1559 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1562 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1569 /* Figure out appropriate versions for all the symbols. We may not
1570 have the version number script until we have read all of the input
1571 files, so until that point we don't know which symbols should be
1572 local. This function is called via elf_link_hash_traverse. */
1575 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1577 struct elf_assign_sym_version_info
*sinfo
;
1578 struct bfd_link_info
*info
;
1579 const struct elf_backend_data
*bed
;
1580 struct elf_info_failed eif
;
1587 if (h
->root
.type
== bfd_link_hash_warning
)
1588 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1590 /* Fix the symbol flags. */
1593 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1596 sinfo
->failed
= TRUE
;
1600 /* We only need version numbers for symbols defined in regular
1602 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1605 bed
= get_elf_backend_data (sinfo
->output_bfd
);
1606 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1607 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1609 struct bfd_elf_version_tree
*t
;
1614 /* There are two consecutive ELF_VER_CHR characters if this is
1615 not a hidden symbol. */
1617 if (*p
== ELF_VER_CHR
)
1623 /* If there is no version string, we can just return out. */
1627 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
1631 /* Look for the version. If we find it, it is no longer weak. */
1632 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1634 if (strcmp (t
->name
, p
) == 0)
1638 struct bfd_elf_version_expr
*d
;
1640 len
= p
- h
->root
.root
.string
;
1641 alc
= bfd_malloc (len
);
1644 memcpy (alc
, h
->root
.root
.string
, len
- 1);
1645 alc
[len
- 1] = '\0';
1646 if (alc
[len
- 2] == ELF_VER_CHR
)
1647 alc
[len
- 2] = '\0';
1649 h
->verinfo
.vertree
= t
;
1653 if (t
->globals
.list
!= NULL
)
1654 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
1656 /* See if there is anything to force this symbol to
1658 if (d
== NULL
&& t
->locals
.list
!= NULL
)
1660 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
1664 && ! info
->export_dynamic
)
1665 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1673 /* If we are building an application, we need to create a
1674 version node for this version. */
1675 if (t
== NULL
&& info
->executable
)
1677 struct bfd_elf_version_tree
**pp
;
1680 /* If we aren't going to export this symbol, we don't need
1681 to worry about it. */
1682 if (h
->dynindx
== -1)
1686 t
= bfd_zalloc (sinfo
->output_bfd
, amt
);
1689 sinfo
->failed
= TRUE
;
1694 t
->name_indx
= (unsigned int) -1;
1698 /* Don't count anonymous version tag. */
1699 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
1701 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
1703 t
->vernum
= version_index
;
1707 h
->verinfo
.vertree
= t
;
1711 /* We could not find the version for a symbol when
1712 generating a shared archive. Return an error. */
1713 (*_bfd_error_handler
)
1714 (_("%s: undefined versioned symbol name %s"),
1715 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
1716 bfd_set_error (bfd_error_bad_value
);
1717 sinfo
->failed
= TRUE
;
1722 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
1725 /* If we don't have a version for this symbol, see if we can find
1727 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
1729 struct bfd_elf_version_tree
*t
;
1730 struct bfd_elf_version_tree
*local_ver
;
1731 struct bfd_elf_version_expr
*d
;
1733 /* See if can find what version this symbol is in. If the
1734 symbol is supposed to be local, then don't actually register
1737 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1739 if (t
->globals
.list
!= NULL
)
1741 bfd_boolean matched
;
1745 while ((d
= (*t
->match
) (&t
->globals
, d
,
1746 h
->root
.root
.string
)) != NULL
)
1751 /* There is a version without definition. Make
1752 the symbol the default definition for this
1754 h
->verinfo
.vertree
= t
;
1762 /* There is no undefined version for this symbol. Hide the
1764 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1767 if (t
->locals
.list
!= NULL
)
1770 while ((d
= (*t
->match
) (&t
->locals
, d
,
1771 h
->root
.root
.string
)) != NULL
)
1774 /* If the match is "*", keep looking for a more
1775 explicit, perhaps even global, match.
1776 XXX: Shouldn't this be !d->wildcard instead? */
1777 if (d
->pattern
[0] != '*' || d
->pattern
[1] != '\0')
1786 if (local_ver
!= NULL
)
1788 h
->verinfo
.vertree
= local_ver
;
1789 if (h
->dynindx
!= -1
1791 && ! info
->export_dynamic
)
1793 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1801 /* Read and swap the relocs from the section indicated by SHDR. This
1802 may be either a REL or a RELA section. The relocations are
1803 translated into RELA relocations and stored in INTERNAL_RELOCS,
1804 which should have already been allocated to contain enough space.
1805 The EXTERNAL_RELOCS are a buffer where the external form of the
1806 relocations should be stored.
1808 Returns FALSE if something goes wrong. */
1811 elf_link_read_relocs_from_section (bfd
*abfd
,
1813 Elf_Internal_Shdr
*shdr
,
1814 void *external_relocs
,
1815 Elf_Internal_Rela
*internal_relocs
)
1817 const struct elf_backend_data
*bed
;
1818 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
1819 const bfd_byte
*erela
;
1820 const bfd_byte
*erelaend
;
1821 Elf_Internal_Rela
*irela
;
1822 Elf_Internal_Shdr
*symtab_hdr
;
1825 /* Position ourselves at the start of the section. */
1826 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
1829 /* Read the relocations. */
1830 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
1833 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1834 nsyms
= symtab_hdr
->sh_size
/ symtab_hdr
->sh_entsize
;
1836 bed
= get_elf_backend_data (abfd
);
1838 /* Convert the external relocations to the internal format. */
1839 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
1840 swap_in
= bed
->s
->swap_reloc_in
;
1841 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
1842 swap_in
= bed
->s
->swap_reloca_in
;
1845 bfd_set_error (bfd_error_wrong_format
);
1849 erela
= external_relocs
;
1850 erelaend
= erela
+ shdr
->sh_size
;
1851 irela
= internal_relocs
;
1852 while (erela
< erelaend
)
1856 (*swap_in
) (abfd
, erela
, irela
);
1857 r_symndx
= ELF32_R_SYM (irela
->r_info
);
1858 if (bed
->s
->arch_size
== 64)
1860 if ((size_t) r_symndx
>= nsyms
)
1862 char *sec_name
= bfd_get_section_ident (sec
);
1863 (*_bfd_error_handler
)
1864 (_("%s: bad reloc symbol index (0x%lx >= 0x%lx) for offset 0x%lx in section `%s'"),
1865 bfd_archive_filename (abfd
), (unsigned long) r_symndx
,
1866 (unsigned long) nsyms
, irela
->r_offset
,
1867 sec_name
? sec_name
: sec
->name
);
1870 bfd_set_error (bfd_error_bad_value
);
1873 irela
+= bed
->s
->int_rels_per_ext_rel
;
1874 erela
+= shdr
->sh_entsize
;
1880 /* Read and swap the relocs for a section O. They may have been
1881 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
1882 not NULL, they are used as buffers to read into. They are known to
1883 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
1884 the return value is allocated using either malloc or bfd_alloc,
1885 according to the KEEP_MEMORY argument. If O has two relocation
1886 sections (both REL and RELA relocations), then the REL_HDR
1887 relocations will appear first in INTERNAL_RELOCS, followed by the
1888 REL_HDR2 relocations. */
1891 _bfd_elf_link_read_relocs (bfd
*abfd
,
1893 void *external_relocs
,
1894 Elf_Internal_Rela
*internal_relocs
,
1895 bfd_boolean keep_memory
)
1897 Elf_Internal_Shdr
*rel_hdr
;
1898 void *alloc1
= NULL
;
1899 Elf_Internal_Rela
*alloc2
= NULL
;
1900 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1902 if (elf_section_data (o
)->relocs
!= NULL
)
1903 return elf_section_data (o
)->relocs
;
1905 if (o
->reloc_count
== 0)
1908 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1910 if (internal_relocs
== NULL
)
1914 size
= o
->reloc_count
;
1915 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
1917 internal_relocs
= bfd_alloc (abfd
, size
);
1919 internal_relocs
= alloc2
= bfd_malloc (size
);
1920 if (internal_relocs
== NULL
)
1924 if (external_relocs
== NULL
)
1926 bfd_size_type size
= rel_hdr
->sh_size
;
1928 if (elf_section_data (o
)->rel_hdr2
)
1929 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
1930 alloc1
= bfd_malloc (size
);
1933 external_relocs
= alloc1
;
1936 if (!elf_link_read_relocs_from_section (abfd
, o
, rel_hdr
,
1940 if (elf_section_data (o
)->rel_hdr2
1941 && (!elf_link_read_relocs_from_section
1943 elf_section_data (o
)->rel_hdr2
,
1944 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
1945 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
1946 * bed
->s
->int_rels_per_ext_rel
))))
1949 /* Cache the results for next time, if we can. */
1951 elf_section_data (o
)->relocs
= internal_relocs
;
1956 /* Don't free alloc2, since if it was allocated we are passing it
1957 back (under the name of internal_relocs). */
1959 return internal_relocs
;
1969 /* Compute the size of, and allocate space for, REL_HDR which is the
1970 section header for a section containing relocations for O. */
1973 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
1974 Elf_Internal_Shdr
*rel_hdr
,
1977 bfd_size_type reloc_count
;
1978 bfd_size_type num_rel_hashes
;
1980 /* Figure out how many relocations there will be. */
1981 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
1982 reloc_count
= elf_section_data (o
)->rel_count
;
1984 reloc_count
= elf_section_data (o
)->rel_count2
;
1986 num_rel_hashes
= o
->reloc_count
;
1987 if (num_rel_hashes
< reloc_count
)
1988 num_rel_hashes
= reloc_count
;
1990 /* That allows us to calculate the size of the section. */
1991 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
1993 /* The contents field must last into write_object_contents, so we
1994 allocate it with bfd_alloc rather than malloc. Also since we
1995 cannot be sure that the contents will actually be filled in,
1996 we zero the allocated space. */
1997 rel_hdr
->contents
= bfd_zalloc (abfd
, rel_hdr
->sh_size
);
1998 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2001 /* We only allocate one set of hash entries, so we only do it the
2002 first time we are called. */
2003 if (elf_section_data (o
)->rel_hashes
== NULL
2006 struct elf_link_hash_entry
**p
;
2008 p
= bfd_zmalloc (num_rel_hashes
* sizeof (struct elf_link_hash_entry
*));
2012 elf_section_data (o
)->rel_hashes
= p
;
2018 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2019 originated from the section given by INPUT_REL_HDR) to the
2023 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2024 asection
*input_section
,
2025 Elf_Internal_Shdr
*input_rel_hdr
,
2026 Elf_Internal_Rela
*internal_relocs
)
2028 Elf_Internal_Rela
*irela
;
2029 Elf_Internal_Rela
*irelaend
;
2031 Elf_Internal_Shdr
*output_rel_hdr
;
2032 asection
*output_section
;
2033 unsigned int *rel_countp
= NULL
;
2034 const struct elf_backend_data
*bed
;
2035 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2037 output_section
= input_section
->output_section
;
2038 output_rel_hdr
= NULL
;
2040 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
2041 == input_rel_hdr
->sh_entsize
)
2043 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
2044 rel_countp
= &elf_section_data (output_section
)->rel_count
;
2046 else if (elf_section_data (output_section
)->rel_hdr2
2047 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
2048 == input_rel_hdr
->sh_entsize
))
2050 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
2051 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
2055 char *sec_name
= bfd_get_section_ident (input_section
);
2056 (*_bfd_error_handler
)
2057 (_("%s: relocation size mismatch in %s section %s"),
2058 bfd_get_filename (output_bfd
),
2059 bfd_archive_filename (input_section
->owner
),
2060 sec_name
? sec_name
: input_section
->name
);
2063 bfd_set_error (bfd_error_wrong_object_format
);
2067 bed
= get_elf_backend_data (output_bfd
);
2068 if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2069 swap_out
= bed
->s
->swap_reloc_out
;
2070 else if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2071 swap_out
= bed
->s
->swap_reloca_out
;
2075 erel
= output_rel_hdr
->contents
;
2076 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
2077 irela
= internal_relocs
;
2078 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2079 * bed
->s
->int_rels_per_ext_rel
);
2080 while (irela
< irelaend
)
2082 (*swap_out
) (output_bfd
, irela
, erel
);
2083 irela
+= bed
->s
->int_rels_per_ext_rel
;
2084 erel
+= input_rel_hdr
->sh_entsize
;
2087 /* Bump the counter, so that we know where to add the next set of
2089 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2094 /* Fix up the flags for a symbol. This handles various cases which
2095 can only be fixed after all the input files are seen. This is
2096 currently called by both adjust_dynamic_symbol and
2097 assign_sym_version, which is unnecessary but perhaps more robust in
2098 the face of future changes. */
2101 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2102 struct elf_info_failed
*eif
)
2104 /* If this symbol was mentioned in a non-ELF file, try to set
2105 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2106 permit a non-ELF file to correctly refer to a symbol defined in
2107 an ELF dynamic object. */
2108 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2110 while (h
->root
.type
== bfd_link_hash_indirect
)
2111 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2113 if (h
->root
.type
!= bfd_link_hash_defined
2114 && h
->root
.type
!= bfd_link_hash_defweak
)
2115 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
2116 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
2119 if (h
->root
.u
.def
.section
->owner
!= NULL
2120 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2121 == bfd_target_elf_flavour
))
2122 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
2123 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
2125 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2128 if (h
->dynindx
== -1
2129 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2130 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2132 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2141 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
2142 was first seen in a non-ELF file. Fortunately, if the symbol
2143 was first seen in an ELF file, we're probably OK unless the
2144 symbol was defined in a non-ELF file. Catch that case here.
2145 FIXME: We're still in trouble if the symbol was first seen in
2146 a dynamic object, and then later in a non-ELF regular object. */
2147 if ((h
->root
.type
== bfd_link_hash_defined
2148 || h
->root
.type
== bfd_link_hash_defweak
)
2149 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2150 && (h
->root
.u
.def
.section
->owner
!= NULL
2151 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2152 != bfd_target_elf_flavour
)
2153 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2154 && (h
->elf_link_hash_flags
2155 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
2156 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2159 /* If this is a final link, and the symbol was defined as a common
2160 symbol in a regular object file, and there was no definition in
2161 any dynamic object, then the linker will have allocated space for
2162 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2163 flag will not have been set. */
2164 if (h
->root
.type
== bfd_link_hash_defined
2165 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2166 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2167 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2168 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2169 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2171 /* If -Bsymbolic was used (which means to bind references to global
2172 symbols to the definition within the shared object), and this
2173 symbol was defined in a regular object, then it actually doesn't
2174 need a PLT entry. Likewise, if the symbol has non-default
2175 visibility. If the symbol has hidden or internal visibility, we
2176 will force it local. */
2177 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2178 && eif
->info
->shared
2179 && is_elf_hash_table (eif
->info
->hash
)
2180 && (eif
->info
->symbolic
2181 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2182 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2184 const struct elf_backend_data
*bed
;
2185 bfd_boolean force_local
;
2187 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2189 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2190 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2191 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2194 /* If a weak undefined symbol has non-default visibility, we also
2195 hide it from the dynamic linker. */
2196 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2197 && h
->root
.type
== bfd_link_hash_undefweak
)
2199 const struct elf_backend_data
*bed
;
2200 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2201 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2204 /* If this is a weak defined symbol in a dynamic object, and we know
2205 the real definition in the dynamic object, copy interesting flags
2206 over to the real definition. */
2207 if (h
->weakdef
!= NULL
)
2209 struct elf_link_hash_entry
*weakdef
;
2211 weakdef
= h
->weakdef
;
2212 if (h
->root
.type
== bfd_link_hash_indirect
)
2213 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2215 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2216 || h
->root
.type
== bfd_link_hash_defweak
);
2217 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2218 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2219 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2221 /* If the real definition is defined by a regular object file,
2222 don't do anything special. See the longer description in
2223 _bfd_elf_adjust_dynamic_symbol, below. */
2224 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2228 const struct elf_backend_data
*bed
;
2230 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2231 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, weakdef
, h
);
2238 /* Make the backend pick a good value for a dynamic symbol. This is
2239 called via elf_link_hash_traverse, and also calls itself
2243 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2245 struct elf_info_failed
*eif
= data
;
2247 const struct elf_backend_data
*bed
;
2249 if (! is_elf_hash_table (eif
->info
->hash
))
2252 if (h
->root
.type
== bfd_link_hash_warning
)
2254 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
2255 h
->got
= elf_hash_table (eif
->info
)->init_offset
;
2257 /* When warning symbols are created, they **replace** the "real"
2258 entry in the hash table, thus we never get to see the real
2259 symbol in a hash traversal. So look at it now. */
2260 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2263 /* Ignore indirect symbols. These are added by the versioning code. */
2264 if (h
->root
.type
== bfd_link_hash_indirect
)
2267 /* Fix the symbol flags. */
2268 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2271 /* If this symbol does not require a PLT entry, and it is not
2272 defined by a dynamic object, or is not referenced by a regular
2273 object, ignore it. We do have to handle a weak defined symbol,
2274 even if no regular object refers to it, if we decided to add it
2275 to the dynamic symbol table. FIXME: Do we normally need to worry
2276 about symbols which are defined by one dynamic object and
2277 referenced by another one? */
2278 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2279 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2280 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2281 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2282 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2284 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
2288 /* If we've already adjusted this symbol, don't do it again. This
2289 can happen via a recursive call. */
2290 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2293 /* Don't look at this symbol again. Note that we must set this
2294 after checking the above conditions, because we may look at a
2295 symbol once, decide not to do anything, and then get called
2296 recursively later after REF_REGULAR is set below. */
2297 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2299 /* If this is a weak definition, and we know a real definition, and
2300 the real symbol is not itself defined by a regular object file,
2301 then get a good value for the real definition. We handle the
2302 real symbol first, for the convenience of the backend routine.
2304 Note that there is a confusing case here. If the real definition
2305 is defined by a regular object file, we don't get the real symbol
2306 from the dynamic object, but we do get the weak symbol. If the
2307 processor backend uses a COPY reloc, then if some routine in the
2308 dynamic object changes the real symbol, we will not see that
2309 change in the corresponding weak symbol. This is the way other
2310 ELF linkers work as well, and seems to be a result of the shared
2313 I will clarify this issue. Most SVR4 shared libraries define the
2314 variable _timezone and define timezone as a weak synonym. The
2315 tzset call changes _timezone. If you write
2316 extern int timezone;
2318 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2319 you might expect that, since timezone is a synonym for _timezone,
2320 the same number will print both times. However, if the processor
2321 backend uses a COPY reloc, then actually timezone will be copied
2322 into your process image, and, since you define _timezone
2323 yourself, _timezone will not. Thus timezone and _timezone will
2324 wind up at different memory locations. The tzset call will set
2325 _timezone, leaving timezone unchanged. */
2327 if (h
->weakdef
!= NULL
)
2329 /* If we get to this point, we know there is an implicit
2330 reference by a regular object file via the weak symbol H.
2331 FIXME: Is this really true? What if the traversal finds
2332 H->WEAKDEF before it finds H? */
2333 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2335 if (! _bfd_elf_adjust_dynamic_symbol (h
->weakdef
, eif
))
2339 /* If a symbol has no type and no size and does not require a PLT
2340 entry, then we are probably about to do the wrong thing here: we
2341 are probably going to create a COPY reloc for an empty object.
2342 This case can arise when a shared object is built with assembly
2343 code, and the assembly code fails to set the symbol type. */
2345 && h
->type
== STT_NOTYPE
2346 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
2347 (*_bfd_error_handler
)
2348 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2349 h
->root
.root
.string
);
2351 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2352 bed
= get_elf_backend_data (dynobj
);
2353 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2362 /* Adjust all external symbols pointing into SEC_MERGE sections
2363 to reflect the object merging within the sections. */
2366 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2370 if (h
->root
.type
== bfd_link_hash_warning
)
2371 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2373 if ((h
->root
.type
== bfd_link_hash_defined
2374 || h
->root
.type
== bfd_link_hash_defweak
)
2375 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2376 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2378 bfd
*output_bfd
= data
;
2380 h
->root
.u
.def
.value
=
2381 _bfd_merged_section_offset (output_bfd
,
2382 &h
->root
.u
.def
.section
,
2383 elf_section_data (sec
)->sec_info
,
2384 h
->root
.u
.def
.value
);
2390 /* Returns false if the symbol referred to by H should be considered
2391 to resolve local to the current module, and true if it should be
2392 considered to bind dynamically. */
2395 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2396 struct bfd_link_info
*info
,
2397 bfd_boolean ignore_protected
)
2399 bfd_boolean binding_stays_local_p
;
2404 while (h
->root
.type
== bfd_link_hash_indirect
2405 || h
->root
.type
== bfd_link_hash_warning
)
2406 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2408 /* If it was forced local, then clearly it's not dynamic. */
2409 if (h
->dynindx
== -1)
2411 if (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
)
2414 /* Identify the cases where name binding rules say that a
2415 visible symbol resolves locally. */
2416 binding_stays_local_p
= info
->executable
|| info
->symbolic
;
2418 switch (ELF_ST_VISIBILITY (h
->other
))
2425 /* Proper resolution for function pointer equality may require
2426 that these symbols perhaps be resolved dynamically, even though
2427 we should be resolving them to the current module. */
2428 if (!ignore_protected
)
2429 binding_stays_local_p
= TRUE
;
2436 /* If it isn't defined locally, then clearly it's dynamic. */
2437 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2440 /* Otherwise, the symbol is dynamic if binding rules don't tell
2441 us that it remains local. */
2442 return !binding_stays_local_p
;
2445 /* Return true if the symbol referred to by H should be considered
2446 to resolve local to the current module, and false otherwise. Differs
2447 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2448 undefined symbols and weak symbols. */
2451 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2452 struct bfd_link_info
*info
,
2453 bfd_boolean local_protected
)
2455 /* If it's a local sym, of course we resolve locally. */
2459 /* If we don't have a definition in a regular file, then we can't
2460 resolve locally. The sym is either undefined or dynamic. */
2461 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2464 /* Forced local symbols resolve locally. */
2465 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
2468 /* As do non-dynamic symbols. */
2469 if (h
->dynindx
== -1)
2472 /* At this point, we know the symbol is defined and dynamic. In an
2473 executable it must resolve locally, likewise when building symbolic
2474 shared libraries. */
2475 if (info
->executable
|| info
->symbolic
)
2478 /* Now deal with defined dynamic symbols in shared libraries. Ones
2479 with default visibility might not resolve locally. */
2480 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2483 /* However, STV_HIDDEN or STV_INTERNAL ones must be local. */
2484 if (ELF_ST_VISIBILITY (h
->other
) != STV_PROTECTED
)
2487 /* Function pointer equality tests may require that STV_PROTECTED
2488 symbols be treated as dynamic symbols, even when we know that the
2489 dynamic linker will resolve them locally. */
2490 return local_protected
;
2493 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2494 aligned. Returns the first TLS output section. */
2496 struct bfd_section
*
2497 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2499 struct bfd_section
*sec
, *tls
;
2500 unsigned int align
= 0;
2502 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2503 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2507 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2508 if (sec
->alignment_power
> align
)
2509 align
= sec
->alignment_power
;
2511 elf_hash_table (info
)->tls_sec
= tls
;
2513 /* Ensure the alignment of the first section is the largest alignment,
2514 so that the tls segment starts aligned. */
2516 tls
->alignment_power
= align
;
2521 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2523 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2524 Elf_Internal_Sym
*sym
)
2526 /* Local symbols do not count, but target specific ones might. */
2527 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2528 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2531 /* Function symbols do not count. */
2532 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
2535 /* If the section is undefined, then so is the symbol. */
2536 if (sym
->st_shndx
== SHN_UNDEF
)
2539 /* If the symbol is defined in the common section, then
2540 it is a common definition and so does not count. */
2541 if (sym
->st_shndx
== SHN_COMMON
)
2544 /* If the symbol is in a target specific section then we
2545 must rely upon the backend to tell us what it is. */
2546 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2547 /* FIXME - this function is not coded yet:
2549 return _bfd_is_global_symbol_definition (abfd, sym);
2551 Instead for now assume that the definition is not global,
2552 Even if this is wrong, at least the linker will behave
2553 in the same way that it used to do. */
2559 /* Search the symbol table of the archive element of the archive ABFD
2560 whose archive map contains a mention of SYMDEF, and determine if
2561 the symbol is defined in this element. */
2563 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2565 Elf_Internal_Shdr
* hdr
;
2566 bfd_size_type symcount
;
2567 bfd_size_type extsymcount
;
2568 bfd_size_type extsymoff
;
2569 Elf_Internal_Sym
*isymbuf
;
2570 Elf_Internal_Sym
*isym
;
2571 Elf_Internal_Sym
*isymend
;
2574 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2578 if (! bfd_check_format (abfd
, bfd_object
))
2581 /* If we have already included the element containing this symbol in the
2582 link then we do not need to include it again. Just claim that any symbol
2583 it contains is not a definition, so that our caller will not decide to
2584 (re)include this element. */
2585 if (abfd
->archive_pass
)
2588 /* Select the appropriate symbol table. */
2589 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2590 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2592 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2594 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2596 /* The sh_info field of the symtab header tells us where the
2597 external symbols start. We don't care about the local symbols. */
2598 if (elf_bad_symtab (abfd
))
2600 extsymcount
= symcount
;
2605 extsymcount
= symcount
- hdr
->sh_info
;
2606 extsymoff
= hdr
->sh_info
;
2609 if (extsymcount
== 0)
2612 /* Read in the symbol table. */
2613 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
2615 if (isymbuf
== NULL
)
2618 /* Scan the symbol table looking for SYMDEF. */
2620 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
2624 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
2629 if (strcmp (name
, symdef
->name
) == 0)
2631 result
= is_global_data_symbol_definition (abfd
, isym
);
2641 /* Add an entry to the .dynamic table. */
2644 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
2648 struct elf_link_hash_table
*hash_table
;
2649 const struct elf_backend_data
*bed
;
2651 bfd_size_type newsize
;
2652 bfd_byte
*newcontents
;
2653 Elf_Internal_Dyn dyn
;
2655 hash_table
= elf_hash_table (info
);
2656 if (! is_elf_hash_table (hash_table
))
2659 bed
= get_elf_backend_data (hash_table
->dynobj
);
2660 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
2661 BFD_ASSERT (s
!= NULL
);
2663 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
2664 newcontents
= bfd_realloc (s
->contents
, newsize
);
2665 if (newcontents
== NULL
)
2669 dyn
.d_un
.d_val
= val
;
2670 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
2673 s
->contents
= newcontents
;
2678 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
2679 otherwise just check whether one already exists. Returns -1 on error,
2680 1 if a DT_NEEDED tag already exists, and 0 on success. */
2683 elf_add_dt_needed_tag (struct bfd_link_info
*info
,
2687 struct elf_link_hash_table
*hash_table
;
2688 bfd_size_type oldsize
;
2689 bfd_size_type strindex
;
2691 hash_table
= elf_hash_table (info
);
2692 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2693 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
2694 if (strindex
== (bfd_size_type
) -1)
2697 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2700 const struct elf_backend_data
*bed
;
2703 bed
= get_elf_backend_data (hash_table
->dynobj
);
2704 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
2705 BFD_ASSERT (sdyn
!= NULL
);
2707 for (extdyn
= sdyn
->contents
;
2708 extdyn
< sdyn
->contents
+ sdyn
->size
;
2709 extdyn
+= bed
->s
->sizeof_dyn
)
2711 Elf_Internal_Dyn dyn
;
2713 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
2714 if (dyn
.d_tag
== DT_NEEDED
2715 && dyn
.d_un
.d_val
== strindex
)
2717 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
2725 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
2729 /* We were just checking for existence of the tag. */
2730 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
2735 /* Sort symbol by value and section. */
2737 elf_sort_symbol (const void *arg1
, const void *arg2
)
2739 const struct elf_link_hash_entry
*h1
;
2740 const struct elf_link_hash_entry
*h2
;
2741 bfd_signed_vma vdiff
;
2743 h1
= *(const struct elf_link_hash_entry
**) arg1
;
2744 h2
= *(const struct elf_link_hash_entry
**) arg2
;
2745 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
2747 return vdiff
> 0 ? 1 : -1;
2750 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
2752 return sdiff
> 0 ? 1 : -1;
2757 /* This function is used to adjust offsets into .dynstr for
2758 dynamic symbols. This is called via elf_link_hash_traverse. */
2761 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
2763 struct elf_strtab_hash
*dynstr
= data
;
2765 if (h
->root
.type
== bfd_link_hash_warning
)
2766 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2768 if (h
->dynindx
!= -1)
2769 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
2773 /* Assign string offsets in .dynstr, update all structures referencing
2777 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
2779 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
2780 struct elf_link_local_dynamic_entry
*entry
;
2781 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
2782 bfd
*dynobj
= hash_table
->dynobj
;
2785 const struct elf_backend_data
*bed
;
2788 _bfd_elf_strtab_finalize (dynstr
);
2789 size
= _bfd_elf_strtab_size (dynstr
);
2791 bed
= get_elf_backend_data (dynobj
);
2792 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2793 BFD_ASSERT (sdyn
!= NULL
);
2795 /* Update all .dynamic entries referencing .dynstr strings. */
2796 for (extdyn
= sdyn
->contents
;
2797 extdyn
< sdyn
->contents
+ sdyn
->size
;
2798 extdyn
+= bed
->s
->sizeof_dyn
)
2800 Elf_Internal_Dyn dyn
;
2802 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
2806 dyn
.d_un
.d_val
= size
;
2814 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
2819 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
2822 /* Now update local dynamic symbols. */
2823 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
2824 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
2825 entry
->isym
.st_name
);
2827 /* And the rest of dynamic symbols. */
2828 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
2830 /* Adjust version definitions. */
2831 if (elf_tdata (output_bfd
)->cverdefs
)
2836 Elf_Internal_Verdef def
;
2837 Elf_Internal_Verdaux defaux
;
2839 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2843 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
2845 p
+= sizeof (Elf_External_Verdef
);
2846 for (i
= 0; i
< def
.vd_cnt
; ++i
)
2848 _bfd_elf_swap_verdaux_in (output_bfd
,
2849 (Elf_External_Verdaux
*) p
, &defaux
);
2850 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
2852 _bfd_elf_swap_verdaux_out (output_bfd
,
2853 &defaux
, (Elf_External_Verdaux
*) p
);
2854 p
+= sizeof (Elf_External_Verdaux
);
2857 while (def
.vd_next
);
2860 /* Adjust version references. */
2861 if (elf_tdata (output_bfd
)->verref
)
2866 Elf_Internal_Verneed need
;
2867 Elf_Internal_Vernaux needaux
;
2869 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2873 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
2875 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
2876 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
2877 (Elf_External_Verneed
*) p
);
2878 p
+= sizeof (Elf_External_Verneed
);
2879 for (i
= 0; i
< need
.vn_cnt
; ++i
)
2881 _bfd_elf_swap_vernaux_in (output_bfd
,
2882 (Elf_External_Vernaux
*) p
, &needaux
);
2883 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
2885 _bfd_elf_swap_vernaux_out (output_bfd
,
2887 (Elf_External_Vernaux
*) p
);
2888 p
+= sizeof (Elf_External_Vernaux
);
2891 while (need
.vn_next
);
2897 /* Add symbols from an ELF object file to the linker hash table. */
2900 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
2902 bfd_boolean (*add_symbol_hook
)
2903 (bfd
*, struct bfd_link_info
*, Elf_Internal_Sym
*,
2904 const char **, flagword
*, asection
**, bfd_vma
*);
2905 bfd_boolean (*check_relocs
)
2906 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
2907 bfd_boolean collect
;
2908 Elf_Internal_Shdr
*hdr
;
2909 bfd_size_type symcount
;
2910 bfd_size_type extsymcount
;
2911 bfd_size_type extsymoff
;
2912 struct elf_link_hash_entry
**sym_hash
;
2913 bfd_boolean dynamic
;
2914 Elf_External_Versym
*extversym
= NULL
;
2915 Elf_External_Versym
*ever
;
2916 struct elf_link_hash_entry
*weaks
;
2917 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
2918 bfd_size_type nondeflt_vers_cnt
= 0;
2919 Elf_Internal_Sym
*isymbuf
= NULL
;
2920 Elf_Internal_Sym
*isym
;
2921 Elf_Internal_Sym
*isymend
;
2922 const struct elf_backend_data
*bed
;
2923 bfd_boolean add_needed
;
2924 struct elf_link_hash_table
* hash_table
;
2927 hash_table
= elf_hash_table (info
);
2929 bed
= get_elf_backend_data (abfd
);
2930 add_symbol_hook
= bed
->elf_add_symbol_hook
;
2931 collect
= bed
->collect
;
2933 if ((abfd
->flags
& DYNAMIC
) == 0)
2939 /* You can't use -r against a dynamic object. Also, there's no
2940 hope of using a dynamic object which does not exactly match
2941 the format of the output file. */
2942 if (info
->relocatable
2943 || !is_elf_hash_table (hash_table
)
2944 || hash_table
->root
.creator
!= abfd
->xvec
)
2946 bfd_set_error (bfd_error_invalid_operation
);
2951 /* As a GNU extension, any input sections which are named
2952 .gnu.warning.SYMBOL are treated as warning symbols for the given
2953 symbol. This differs from .gnu.warning sections, which generate
2954 warnings when they are included in an output file. */
2955 if (info
->executable
)
2959 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2963 name
= bfd_get_section_name (abfd
, s
);
2964 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
2968 bfd_size_type prefix_len
;
2969 const char * gnu_warning_prefix
= _("warning: ");
2971 name
+= sizeof ".gnu.warning." - 1;
2973 /* If this is a shared object, then look up the symbol
2974 in the hash table. If it is there, and it is already
2975 been defined, then we will not be using the entry
2976 from this shared object, so we don't need to warn.
2977 FIXME: If we see the definition in a regular object
2978 later on, we will warn, but we shouldn't. The only
2979 fix is to keep track of what warnings we are supposed
2980 to emit, and then handle them all at the end of the
2984 struct elf_link_hash_entry
*h
;
2986 h
= elf_link_hash_lookup (hash_table
, name
,
2987 FALSE
, FALSE
, TRUE
);
2989 /* FIXME: What about bfd_link_hash_common? */
2991 && (h
->root
.type
== bfd_link_hash_defined
2992 || h
->root
.type
== bfd_link_hash_defweak
))
2994 /* We don't want to issue this warning. Clobber
2995 the section size so that the warning does not
2996 get copied into the output file. */
3003 prefix_len
= strlen (gnu_warning_prefix
);
3004 msg
= bfd_alloc (abfd
, prefix_len
+ sz
+ 1);
3008 strcpy (msg
, gnu_warning_prefix
);
3009 if (! bfd_get_section_contents (abfd
, s
, msg
+ prefix_len
, 0, sz
))
3012 msg
[prefix_len
+ sz
] = '\0';
3014 if (! (_bfd_generic_link_add_one_symbol
3015 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3016 FALSE
, collect
, NULL
)))
3019 if (! info
->relocatable
)
3021 /* Clobber the section size so that the warning does
3022 not get copied into the output file. */
3032 /* If we are creating a shared library, create all the dynamic
3033 sections immediately. We need to attach them to something,
3034 so we attach them to this BFD, provided it is the right
3035 format. FIXME: If there are no input BFD's of the same
3036 format as the output, we can't make a shared library. */
3038 && is_elf_hash_table (hash_table
)
3039 && hash_table
->root
.creator
== abfd
->xvec
3040 && ! hash_table
->dynamic_sections_created
)
3042 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3046 else if (!is_elf_hash_table (hash_table
))
3051 const char *soname
= NULL
;
3052 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3055 /* ld --just-symbols and dynamic objects don't mix very well.
3056 Test for --just-symbols by looking at info set up by
3057 _bfd_elf_link_just_syms. */
3058 if ((s
= abfd
->sections
) != NULL
3059 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3062 /* If this dynamic lib was specified on the command line with
3063 --as-needed in effect, then we don't want to add a DT_NEEDED
3064 tag unless the lib is actually used. Similary for libs brought
3065 in by another lib's DT_NEEDED. */
3066 add_needed
= elf_dyn_lib_class (abfd
) == DYN_NORMAL
;
3068 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3074 unsigned long shlink
;
3076 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3077 goto error_free_dyn
;
3079 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3081 goto error_free_dyn
;
3082 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3084 for (extdyn
= dynbuf
;
3085 extdyn
< dynbuf
+ s
->size
;
3086 extdyn
+= bed
->s
->sizeof_dyn
)
3088 Elf_Internal_Dyn dyn
;
3090 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3091 if (dyn
.d_tag
== DT_SONAME
)
3093 unsigned int tagv
= dyn
.d_un
.d_val
;
3094 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3096 goto error_free_dyn
;
3098 if (dyn
.d_tag
== DT_NEEDED
)
3100 struct bfd_link_needed_list
*n
, **pn
;
3102 unsigned int tagv
= dyn
.d_un
.d_val
;
3104 amt
= sizeof (struct bfd_link_needed_list
);
3105 n
= bfd_alloc (abfd
, amt
);
3106 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3107 if (n
== NULL
|| fnm
== NULL
)
3108 goto error_free_dyn
;
3109 amt
= strlen (fnm
) + 1;
3110 anm
= bfd_alloc (abfd
, amt
);
3112 goto error_free_dyn
;
3113 memcpy (anm
, fnm
, amt
);
3117 for (pn
= & hash_table
->needed
;
3123 if (dyn
.d_tag
== DT_RUNPATH
)
3125 struct bfd_link_needed_list
*n
, **pn
;
3127 unsigned int tagv
= dyn
.d_un
.d_val
;
3129 amt
= sizeof (struct bfd_link_needed_list
);
3130 n
= bfd_alloc (abfd
, amt
);
3131 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3132 if (n
== NULL
|| fnm
== NULL
)
3133 goto error_free_dyn
;
3134 amt
= strlen (fnm
) + 1;
3135 anm
= bfd_alloc (abfd
, amt
);
3137 goto error_free_dyn
;
3138 memcpy (anm
, fnm
, amt
);
3142 for (pn
= & runpath
;
3148 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3149 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3151 struct bfd_link_needed_list
*n
, **pn
;
3153 unsigned int tagv
= dyn
.d_un
.d_val
;
3155 amt
= sizeof (struct bfd_link_needed_list
);
3156 n
= bfd_alloc (abfd
, amt
);
3157 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3158 if (n
== NULL
|| fnm
== NULL
)
3159 goto error_free_dyn
;
3160 amt
= strlen (fnm
) + 1;
3161 anm
= bfd_alloc (abfd
, amt
);
3168 memcpy (anm
, fnm
, amt
);
3183 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3184 frees all more recently bfd_alloc'd blocks as well. */
3190 struct bfd_link_needed_list
**pn
;
3191 for (pn
= & hash_table
->runpath
;
3198 /* We do not want to include any of the sections in a dynamic
3199 object in the output file. We hack by simply clobbering the
3200 list of sections in the BFD. This could be handled more
3201 cleanly by, say, a new section flag; the existing
3202 SEC_NEVER_LOAD flag is not the one we want, because that one
3203 still implies that the section takes up space in the output
3205 bfd_section_list_clear (abfd
);
3207 /* If this is the first dynamic object found in the link, create
3208 the special sections required for dynamic linking. */
3209 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3212 /* Find the name to use in a DT_NEEDED entry that refers to this
3213 object. If the object has a DT_SONAME entry, we use it.
3214 Otherwise, if the generic linker stuck something in
3215 elf_dt_name, we use that. Otherwise, we just use the file
3217 if (soname
== NULL
|| *soname
== '\0')
3219 soname
= elf_dt_name (abfd
);
3220 if (soname
== NULL
|| *soname
== '\0')
3221 soname
= bfd_get_filename (abfd
);
3224 /* Save the SONAME because sometimes the linker emulation code
3225 will need to know it. */
3226 elf_dt_name (abfd
) = soname
;
3228 ret
= elf_add_dt_needed_tag (info
, soname
, add_needed
);
3232 /* If we have already included this dynamic object in the
3233 link, just ignore it. There is no reason to include a
3234 particular dynamic object more than once. */
3239 /* If this is a dynamic object, we always link against the .dynsym
3240 symbol table, not the .symtab symbol table. The dynamic linker
3241 will only see the .dynsym symbol table, so there is no reason to
3242 look at .symtab for a dynamic object. */
3244 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3245 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3247 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3249 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3251 /* The sh_info field of the symtab header tells us where the
3252 external symbols start. We don't care about the local symbols at
3254 if (elf_bad_symtab (abfd
))
3256 extsymcount
= symcount
;
3261 extsymcount
= symcount
- hdr
->sh_info
;
3262 extsymoff
= hdr
->sh_info
;
3266 if (extsymcount
!= 0)
3268 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3270 if (isymbuf
== NULL
)
3273 /* We store a pointer to the hash table entry for each external
3275 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3276 sym_hash
= bfd_alloc (abfd
, amt
);
3277 if (sym_hash
== NULL
)
3278 goto error_free_sym
;
3279 elf_sym_hashes (abfd
) = sym_hash
;
3284 /* Read in any version definitions. */
3285 if (! _bfd_elf_slurp_version_tables (abfd
))
3286 goto error_free_sym
;
3288 /* Read in the symbol versions, but don't bother to convert them
3289 to internal format. */
3290 if (elf_dynversym (abfd
) != 0)
3292 Elf_Internal_Shdr
*versymhdr
;
3294 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3295 extversym
= bfd_malloc (versymhdr
->sh_size
);
3296 if (extversym
== NULL
)
3297 goto error_free_sym
;
3298 amt
= versymhdr
->sh_size
;
3299 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3300 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3301 goto error_free_vers
;
3307 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3308 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3310 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3317 struct elf_link_hash_entry
*h
;
3318 bfd_boolean definition
;
3319 bfd_boolean size_change_ok
;
3320 bfd_boolean type_change_ok
;
3321 bfd_boolean new_weakdef
;
3322 bfd_boolean override
;
3323 unsigned int old_alignment
;
3328 flags
= BSF_NO_FLAGS
;
3330 value
= isym
->st_value
;
3333 bind
= ELF_ST_BIND (isym
->st_info
);
3334 if (bind
== STB_LOCAL
)
3336 /* This should be impossible, since ELF requires that all
3337 global symbols follow all local symbols, and that sh_info
3338 point to the first global symbol. Unfortunately, Irix 5
3342 else if (bind
== STB_GLOBAL
)
3344 if (isym
->st_shndx
!= SHN_UNDEF
3345 && isym
->st_shndx
!= SHN_COMMON
)
3348 else if (bind
== STB_WEAK
)
3352 /* Leave it up to the processor backend. */
3355 if (isym
->st_shndx
== SHN_UNDEF
)
3356 sec
= bfd_und_section_ptr
;
3357 else if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
3359 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3361 sec
= bfd_abs_section_ptr
;
3362 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3365 else if (isym
->st_shndx
== SHN_ABS
)
3366 sec
= bfd_abs_section_ptr
;
3367 else if (isym
->st_shndx
== SHN_COMMON
)
3369 sec
= bfd_com_section_ptr
;
3370 /* What ELF calls the size we call the value. What ELF
3371 calls the value we call the alignment. */
3372 value
= isym
->st_size
;
3376 /* Leave it up to the processor backend. */
3379 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3382 goto error_free_vers
;
3384 if (isym
->st_shndx
== SHN_COMMON
3385 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
3387 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3391 tcomm
= bfd_make_section (abfd
, ".tcommon");
3393 || !bfd_set_section_flags (abfd
, tcomm
, (SEC_ALLOC
3395 | SEC_LINKER_CREATED
3396 | SEC_THREAD_LOCAL
)))
3397 goto error_free_vers
;
3401 else if (add_symbol_hook
)
3403 if (! (*add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
, &sec
,
3405 goto error_free_vers
;
3407 /* The hook function sets the name to NULL if this symbol
3408 should be skipped for some reason. */
3413 /* Sanity check that all possibilities were handled. */
3416 bfd_set_error (bfd_error_bad_value
);
3417 goto error_free_vers
;
3420 if (bfd_is_und_section (sec
)
3421 || bfd_is_com_section (sec
))
3426 size_change_ok
= FALSE
;
3427 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
3431 if (is_elf_hash_table (hash_table
))
3433 Elf_Internal_Versym iver
;
3434 unsigned int vernum
= 0;
3439 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
3440 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
3442 /* If this is a hidden symbol, or if it is not version
3443 1, we append the version name to the symbol name.
3444 However, we do not modify a non-hidden absolute
3445 symbol, because it might be the version symbol
3446 itself. FIXME: What if it isn't? */
3447 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
3448 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
3451 size_t namelen
, verlen
, newlen
;
3454 if (isym
->st_shndx
!= SHN_UNDEF
)
3456 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
3458 (*_bfd_error_handler
)
3459 (_("%s: %s: invalid version %u (max %d)"),
3460 bfd_archive_filename (abfd
), name
, vernum
,
3461 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
3462 bfd_set_error (bfd_error_bad_value
);
3463 goto error_free_vers
;
3465 else if (vernum
> 1)
3467 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
3473 /* We cannot simply test for the number of
3474 entries in the VERNEED section since the
3475 numbers for the needed versions do not start
3477 Elf_Internal_Verneed
*t
;
3480 for (t
= elf_tdata (abfd
)->verref
;
3484 Elf_Internal_Vernaux
*a
;
3486 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3488 if (a
->vna_other
== vernum
)
3490 verstr
= a
->vna_nodename
;
3499 (*_bfd_error_handler
)
3500 (_("%s: %s: invalid needed version %d"),
3501 bfd_archive_filename (abfd
), name
, vernum
);
3502 bfd_set_error (bfd_error_bad_value
);
3503 goto error_free_vers
;
3507 namelen
= strlen (name
);
3508 verlen
= strlen (verstr
);
3509 newlen
= namelen
+ verlen
+ 2;
3510 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3511 && isym
->st_shndx
!= SHN_UNDEF
)
3514 newname
= bfd_alloc (abfd
, newlen
);
3515 if (newname
== NULL
)
3516 goto error_free_vers
;
3517 memcpy (newname
, name
, namelen
);
3518 p
= newname
+ namelen
;
3520 /* If this is a defined non-hidden version symbol,
3521 we add another @ to the name. This indicates the
3522 default version of the symbol. */
3523 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3524 && isym
->st_shndx
!= SHN_UNDEF
)
3526 memcpy (p
, verstr
, verlen
+ 1);
3532 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
3533 sym_hash
, &skip
, &override
,
3534 &type_change_ok
, &size_change_ok
))
3535 goto error_free_vers
;
3544 while (h
->root
.type
== bfd_link_hash_indirect
3545 || h
->root
.type
== bfd_link_hash_warning
)
3546 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3548 /* Remember the old alignment if this is a common symbol, so
3549 that we don't reduce the alignment later on. We can't
3550 check later, because _bfd_generic_link_add_one_symbol
3551 will set a default for the alignment which we want to
3552 override. We also remember the old bfd where the existing
3553 definition comes from. */
3554 switch (h
->root
.type
)
3559 case bfd_link_hash_defined
:
3560 case bfd_link_hash_defweak
:
3561 old_bfd
= h
->root
.u
.def
.section
->owner
;
3564 case bfd_link_hash_common
:
3565 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
3566 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
3570 if (elf_tdata (abfd
)->verdef
!= NULL
3574 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
3577 if (! (_bfd_generic_link_add_one_symbol
3578 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, collect
,
3579 (struct bfd_link_hash_entry
**) sym_hash
)))
3580 goto error_free_vers
;
3583 while (h
->root
.type
== bfd_link_hash_indirect
3584 || h
->root
.type
== bfd_link_hash_warning
)
3585 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3588 new_weakdef
= FALSE
;
3591 && (flags
& BSF_WEAK
) != 0
3592 && ELF_ST_TYPE (isym
->st_info
) != STT_FUNC
3593 && is_elf_hash_table (hash_table
)
3594 && h
->weakdef
== NULL
)
3596 /* Keep a list of all weak defined non function symbols from
3597 a dynamic object, using the weakdef field. Later in this
3598 function we will set the weakdef field to the correct
3599 value. We only put non-function symbols from dynamic
3600 objects on this list, because that happens to be the only
3601 time we need to know the normal symbol corresponding to a
3602 weak symbol, and the information is time consuming to
3603 figure out. If the weakdef field is not already NULL,
3604 then this symbol was already defined by some previous
3605 dynamic object, and we will be using that previous
3606 definition anyhow. */
3613 /* Set the alignment of a common symbol. */
3614 if (isym
->st_shndx
== SHN_COMMON
3615 && h
->root
.type
== bfd_link_hash_common
)
3619 align
= bfd_log2 (isym
->st_value
);
3620 if (align
> old_alignment
3621 /* Permit an alignment power of zero if an alignment of one
3622 is specified and no other alignments have been specified. */
3623 || (isym
->st_value
== 1 && old_alignment
== 0))
3624 h
->root
.u
.c
.p
->alignment_power
= align
;
3626 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
3629 if (is_elf_hash_table (hash_table
))
3635 /* Check the alignment when a common symbol is involved. This
3636 can change when a common symbol is overridden by a normal
3637 definition or a common symbol is ignored due to the old
3638 normal definition. We need to make sure the maximum
3639 alignment is maintained. */
3640 if ((old_alignment
|| isym
->st_shndx
== SHN_COMMON
)
3641 && h
->root
.type
!= bfd_link_hash_common
)
3643 unsigned int common_align
;
3644 unsigned int normal_align
;
3645 unsigned int symbol_align
;
3649 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
3650 if (h
->root
.u
.def
.section
->owner
!= NULL
3651 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3653 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
3654 if (normal_align
> symbol_align
)
3655 normal_align
= symbol_align
;
3658 normal_align
= symbol_align
;
3662 common_align
= old_alignment
;
3663 common_bfd
= old_bfd
;
3668 common_align
= bfd_log2 (isym
->st_value
);
3670 normal_bfd
= old_bfd
;
3673 if (normal_align
< common_align
)
3674 (*_bfd_error_handler
)
3675 (_("Warning: alignment %u of symbol `%s' in %s is smaller than %u in %s"),
3678 bfd_archive_filename (normal_bfd
),
3680 bfd_archive_filename (common_bfd
));
3683 /* Remember the symbol size and type. */
3684 if (isym
->st_size
!= 0
3685 && (definition
|| h
->size
== 0))
3687 if (h
->size
!= 0 && h
->size
!= isym
->st_size
&& ! size_change_ok
)
3688 (*_bfd_error_handler
)
3689 (_("Warning: size of symbol `%s' changed from %lu in %s to %lu in %s"),
3690 name
, (unsigned long) h
->size
,
3691 bfd_archive_filename (old_bfd
),
3692 (unsigned long) isym
->st_size
,
3693 bfd_archive_filename (abfd
));
3695 h
->size
= isym
->st_size
;
3698 /* If this is a common symbol, then we always want H->SIZE
3699 to be the size of the common symbol. The code just above
3700 won't fix the size if a common symbol becomes larger. We
3701 don't warn about a size change here, because that is
3702 covered by --warn-common. */
3703 if (h
->root
.type
== bfd_link_hash_common
)
3704 h
->size
= h
->root
.u
.c
.size
;
3706 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
3707 && (definition
|| h
->type
== STT_NOTYPE
))
3709 if (h
->type
!= STT_NOTYPE
3710 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
3711 && ! type_change_ok
)
3712 (*_bfd_error_handler
)
3713 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
3714 name
, h
->type
, ELF_ST_TYPE (isym
->st_info
),
3715 bfd_archive_filename (abfd
));
3717 h
->type
= ELF_ST_TYPE (isym
->st_info
);
3720 /* If st_other has a processor-specific meaning, specific
3721 code might be needed here. We never merge the visibility
3722 attribute with the one from a dynamic object. */
3723 if (bed
->elf_backend_merge_symbol_attribute
)
3724 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
3727 if (isym
->st_other
!= 0 && !dynamic
)
3729 unsigned char hvis
, symvis
, other
, nvis
;
3731 /* Take the balance of OTHER from the definition. */
3732 other
= (definition
? isym
->st_other
: h
->other
);
3733 other
&= ~ ELF_ST_VISIBILITY (-1);
3735 /* Combine visibilities, using the most constraining one. */
3736 hvis
= ELF_ST_VISIBILITY (h
->other
);
3737 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
3743 nvis
= hvis
< symvis
? hvis
: symvis
;
3745 h
->other
= other
| nvis
;
3748 /* Set a flag in the hash table entry indicating the type of
3749 reference or definition we just found. Keep a count of
3750 the number of dynamic symbols we find. A dynamic symbol
3751 is one which is referenced or defined by both a regular
3752 object and a shared object. */
3753 old_flags
= h
->elf_link_hash_flags
;
3759 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
3760 if (bind
!= STB_WEAK
)
3761 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3764 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
3765 if (! info
->executable
3766 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
3767 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
3773 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
3775 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
3776 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
3777 | ELF_LINK_HASH_REF_REGULAR
)) != 0
3778 || (h
->weakdef
!= NULL
3780 && h
->weakdef
->dynindx
!= -1))
3784 h
->elf_link_hash_flags
|= new_flag
;
3786 /* Check to see if we need to add an indirect symbol for
3787 the default name. */
3788 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
3789 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
3790 &sec
, &value
, &dynsym
,
3792 goto error_free_vers
;
3794 if (definition
&& !dynamic
)
3796 char *p
= strchr (name
, ELF_VER_CHR
);
3797 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
3799 /* Queue non-default versions so that .symver x, x@FOO
3800 aliases can be checked. */
3801 if (! nondeflt_vers
)
3803 amt
= (isymend
- isym
+ 1)
3804 * sizeof (struct elf_link_hash_entry
*);
3805 nondeflt_vers
= bfd_malloc (amt
);
3807 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
3811 if (dynsym
&& h
->dynindx
== -1)
3813 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3814 goto error_free_vers
;
3815 if (h
->weakdef
!= NULL
3817 && h
->weakdef
->dynindx
== -1)
3819 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
3820 goto error_free_vers
;
3823 else if (dynsym
&& h
->dynindx
!= -1)
3824 /* If the symbol already has a dynamic index, but
3825 visibility says it should not be visible, turn it into
3827 switch (ELF_ST_VISIBILITY (h
->other
))
3831 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
3839 && (h
->elf_link_hash_flags
3840 & ELF_LINK_HASH_REF_REGULAR
) != 0)
3843 const char *soname
= elf_dt_name (abfd
);
3845 /* A symbol from a library loaded via DT_NEEDED of some
3846 other library is referenced by a regular object.
3847 Add a DT_NEEDED entry for it. */
3849 ret
= elf_add_dt_needed_tag (info
, soname
, add_needed
);
3851 goto error_free_vers
;
3853 BFD_ASSERT (ret
== 0);
3858 /* Now that all the symbols from this input file are created, handle
3859 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
3860 if (nondeflt_vers
!= NULL
)
3862 bfd_size_type cnt
, symidx
;
3864 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
3866 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
3867 char *shortname
, *p
;
3869 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3871 || (h
->root
.type
!= bfd_link_hash_defined
3872 && h
->root
.type
!= bfd_link_hash_defweak
))
3875 amt
= p
- h
->root
.root
.string
;
3876 shortname
= bfd_malloc (amt
+ 1);
3877 memcpy (shortname
, h
->root
.root
.string
, amt
);
3878 shortname
[amt
] = '\0';
3880 hi
= (struct elf_link_hash_entry
*)
3881 bfd_link_hash_lookup (&hash_table
->root
, shortname
,
3882 FALSE
, FALSE
, FALSE
);
3884 && hi
->root
.type
== h
->root
.type
3885 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
3886 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
3888 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
3889 hi
->root
.type
= bfd_link_hash_indirect
;
3890 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
3891 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
3892 sym_hash
= elf_sym_hashes (abfd
);
3894 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
3895 if (sym_hash
[symidx
] == hi
)
3897 sym_hash
[symidx
] = h
;
3903 free (nondeflt_vers
);
3904 nondeflt_vers
= NULL
;
3907 if (extversym
!= NULL
)
3913 if (isymbuf
!= NULL
)
3917 /* Now set the weakdefs field correctly for all the weak defined
3918 symbols we found. The only way to do this is to search all the
3919 symbols. Since we only need the information for non functions in
3920 dynamic objects, that's the only time we actually put anything on
3921 the list WEAKS. We need this information so that if a regular
3922 object refers to a symbol defined weakly in a dynamic object, the
3923 real symbol in the dynamic object is also put in the dynamic
3924 symbols; we also must arrange for both symbols to point to the
3925 same memory location. We could handle the general case of symbol
3926 aliasing, but a general symbol alias can only be generated in
3927 assembler code, handling it correctly would be very time
3928 consuming, and other ELF linkers don't handle general aliasing
3932 struct elf_link_hash_entry
**hpp
;
3933 struct elf_link_hash_entry
**hppend
;
3934 struct elf_link_hash_entry
**sorted_sym_hash
;
3935 struct elf_link_hash_entry
*h
;
3938 /* Since we have to search the whole symbol list for each weak
3939 defined symbol, search time for N weak defined symbols will be
3940 O(N^2). Binary search will cut it down to O(NlogN). */
3941 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3942 sorted_sym_hash
= bfd_malloc (amt
);
3943 if (sorted_sym_hash
== NULL
)
3945 sym_hash
= sorted_sym_hash
;
3946 hpp
= elf_sym_hashes (abfd
);
3947 hppend
= hpp
+ extsymcount
;
3949 for (; hpp
< hppend
; hpp
++)
3953 && h
->root
.type
== bfd_link_hash_defined
3954 && h
->type
!= STT_FUNC
)
3962 qsort (sorted_sym_hash
, sym_count
,
3963 sizeof (struct elf_link_hash_entry
*),
3966 while (weaks
!= NULL
)
3968 struct elf_link_hash_entry
*hlook
;
3975 weaks
= hlook
->weakdef
;
3976 hlook
->weakdef
= NULL
;
3978 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
3979 || hlook
->root
.type
== bfd_link_hash_defweak
3980 || hlook
->root
.type
== bfd_link_hash_common
3981 || hlook
->root
.type
== bfd_link_hash_indirect
);
3982 slook
= hlook
->root
.u
.def
.section
;
3983 vlook
= hlook
->root
.u
.def
.value
;
3990 bfd_signed_vma vdiff
;
3992 h
= sorted_sym_hash
[idx
];
3993 vdiff
= vlook
- h
->root
.u
.def
.value
;
4000 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4013 /* We didn't find a value/section match. */
4017 for (i
= ilook
; i
< sym_count
; i
++)
4019 h
= sorted_sym_hash
[i
];
4021 /* Stop if value or section doesn't match. */
4022 if (h
->root
.u
.def
.value
!= vlook
4023 || h
->root
.u
.def
.section
!= slook
)
4025 else if (h
!= hlook
)
4029 /* If the weak definition is in the list of dynamic
4030 symbols, make sure the real definition is put
4032 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4034 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4038 /* If the real definition is in the list of dynamic
4039 symbols, make sure the weak definition is put
4040 there as well. If we don't do this, then the
4041 dynamic loader might not merge the entries for the
4042 real definition and the weak definition. */
4043 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4045 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4053 free (sorted_sym_hash
);
4056 /* If this object is the same format as the output object, and it is
4057 not a shared library, then let the backend look through the
4060 This is required to build global offset table entries and to
4061 arrange for dynamic relocs. It is not required for the
4062 particular common case of linking non PIC code, even when linking
4063 against shared libraries, but unfortunately there is no way of
4064 knowing whether an object file has been compiled PIC or not.
4065 Looking through the relocs is not particularly time consuming.
4066 The problem is that we must either (1) keep the relocs in memory,
4067 which causes the linker to require additional runtime memory or
4068 (2) read the relocs twice from the input file, which wastes time.
4069 This would be a good case for using mmap.
4071 I have no idea how to handle linking PIC code into a file of a
4072 different format. It probably can't be done. */
4073 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
4075 && is_elf_hash_table (hash_table
)
4076 && hash_table
->root
.creator
== abfd
->xvec
4077 && check_relocs
!= NULL
)
4081 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4083 Elf_Internal_Rela
*internal_relocs
;
4086 if ((o
->flags
& SEC_RELOC
) == 0
4087 || o
->reloc_count
== 0
4088 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4089 && (o
->flags
& SEC_DEBUGGING
) != 0)
4090 || bfd_is_abs_section (o
->output_section
))
4093 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4095 if (internal_relocs
== NULL
)
4098 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
4100 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4101 free (internal_relocs
);
4108 /* If this is a non-traditional link, try to optimize the handling
4109 of the .stab/.stabstr sections. */
4111 && ! info
->traditional_format
4112 && is_elf_hash_table (hash_table
)
4113 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4117 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4118 if (stabstr
!= NULL
)
4120 bfd_size_type string_offset
= 0;
4123 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4124 if (strncmp (".stab", stab
->name
, 5) == 0
4125 && (!stab
->name
[5] ||
4126 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4127 && (stab
->flags
& SEC_MERGE
) == 0
4128 && !bfd_is_abs_section (stab
->output_section
))
4130 struct bfd_elf_section_data
*secdata
;
4132 secdata
= elf_section_data (stab
);
4133 if (! _bfd_link_section_stabs (abfd
,
4134 &hash_table
->stab_info
,
4139 if (secdata
->sec_info
)
4140 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4145 if (is_elf_hash_table (hash_table
))
4147 /* Add this bfd to the loaded list. */
4148 struct elf_link_loaded_list
*n
;
4150 n
= bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4154 n
->next
= hash_table
->loaded
;
4155 hash_table
->loaded
= n
;
4161 if (nondeflt_vers
!= NULL
)
4162 free (nondeflt_vers
);
4163 if (extversym
!= NULL
)
4166 if (isymbuf
!= NULL
)
4172 /* Add symbols from an ELF archive file to the linker hash table. We
4173 don't use _bfd_generic_link_add_archive_symbols because of a
4174 problem which arises on UnixWare. The UnixWare libc.so is an
4175 archive which includes an entry libc.so.1 which defines a bunch of
4176 symbols. The libc.so archive also includes a number of other
4177 object files, which also define symbols, some of which are the same
4178 as those defined in libc.so.1. Correct linking requires that we
4179 consider each object file in turn, and include it if it defines any
4180 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4181 this; it looks through the list of undefined symbols, and includes
4182 any object file which defines them. When this algorithm is used on
4183 UnixWare, it winds up pulling in libc.so.1 early and defining a
4184 bunch of symbols. This means that some of the other objects in the
4185 archive are not included in the link, which is incorrect since they
4186 precede libc.so.1 in the archive.
4188 Fortunately, ELF archive handling is simpler than that done by
4189 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4190 oddities. In ELF, if we find a symbol in the archive map, and the
4191 symbol is currently undefined, we know that we must pull in that
4194 Unfortunately, we do have to make multiple passes over the symbol
4195 table until nothing further is resolved. */
4198 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4201 bfd_boolean
*defined
= NULL
;
4202 bfd_boolean
*included
= NULL
;
4207 if (! bfd_has_map (abfd
))
4209 /* An empty archive is a special case. */
4210 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4212 bfd_set_error (bfd_error_no_armap
);
4216 /* Keep track of all symbols we know to be already defined, and all
4217 files we know to be already included. This is to speed up the
4218 second and subsequent passes. */
4219 c
= bfd_ardata (abfd
)->symdef_count
;
4223 amt
*= sizeof (bfd_boolean
);
4224 defined
= bfd_zmalloc (amt
);
4225 included
= bfd_zmalloc (amt
);
4226 if (defined
== NULL
|| included
== NULL
)
4229 symdefs
= bfd_ardata (abfd
)->symdefs
;
4242 symdefend
= symdef
+ c
;
4243 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
4245 struct elf_link_hash_entry
*h
;
4247 struct bfd_link_hash_entry
*undefs_tail
;
4250 if (defined
[i
] || included
[i
])
4252 if (symdef
->file_offset
== last
)
4258 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
4259 FALSE
, FALSE
, FALSE
);
4266 /* If this is a default version (the name contains @@),
4267 look up the symbol again with only one `@' as well
4268 as without the version. The effect is that references
4269 to the symbol with and without the version will be
4270 matched by the default symbol in the archive. */
4272 p
= strchr (symdef
->name
, ELF_VER_CHR
);
4273 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4276 /* First check with only one `@'. */
4277 len
= strlen (symdef
->name
);
4278 copy
= bfd_alloc (abfd
, len
);
4281 first
= p
- symdef
->name
+ 1;
4282 memcpy (copy
, symdef
->name
, first
);
4283 memcpy (copy
+ first
, symdef
->name
+ first
+ 1, len
- first
);
4285 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4286 FALSE
, FALSE
, FALSE
);
4290 /* We also need to check references to the symbol
4291 without the version. */
4293 copy
[first
- 1] = '\0';
4294 h
= elf_link_hash_lookup (elf_hash_table (info
),
4295 copy
, FALSE
, FALSE
, FALSE
);
4298 bfd_release (abfd
, copy
);
4304 if (h
->root
.type
== bfd_link_hash_common
)
4306 /* We currently have a common symbol. The archive map contains
4307 a reference to this symbol, so we may want to include it. We
4308 only want to include it however, if this archive element
4309 contains a definition of the symbol, not just another common
4312 Unfortunately some archivers (including GNU ar) will put
4313 declarations of common symbols into their archive maps, as
4314 well as real definitions, so we cannot just go by the archive
4315 map alone. Instead we must read in the element's symbol
4316 table and check that to see what kind of symbol definition
4318 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
4321 else if (h
->root
.type
!= bfd_link_hash_undefined
)
4323 if (h
->root
.type
!= bfd_link_hash_undefweak
)
4328 /* We need to include this archive member. */
4329 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
4330 if (element
== NULL
)
4333 if (! bfd_check_format (element
, bfd_object
))
4336 /* Doublecheck that we have not included this object
4337 already--it should be impossible, but there may be
4338 something wrong with the archive. */
4339 if (element
->archive_pass
!= 0)
4341 bfd_set_error (bfd_error_bad_value
);
4344 element
->archive_pass
= 1;
4346 undefs_tail
= info
->hash
->undefs_tail
;
4348 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
4351 if (! bfd_link_add_symbols (element
, info
))
4354 /* If there are any new undefined symbols, we need to make
4355 another pass through the archive in order to see whether
4356 they can be defined. FIXME: This isn't perfect, because
4357 common symbols wind up on undefs_tail and because an
4358 undefined symbol which is defined later on in this pass
4359 does not require another pass. This isn't a bug, but it
4360 does make the code less efficient than it could be. */
4361 if (undefs_tail
!= info
->hash
->undefs_tail
)
4364 /* Look backward to mark all symbols from this object file
4365 which we have already seen in this pass. */
4369 included
[mark
] = TRUE
;
4374 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
4376 /* We mark subsequent symbols from this object file as we go
4377 on through the loop. */
4378 last
= symdef
->file_offset
;
4389 if (defined
!= NULL
)
4391 if (included
!= NULL
)
4396 /* Given an ELF BFD, add symbols to the global hash table as
4400 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4402 switch (bfd_get_format (abfd
))
4405 return elf_link_add_object_symbols (abfd
, info
);
4407 return elf_link_add_archive_symbols (abfd
, info
);
4409 bfd_set_error (bfd_error_wrong_format
);
4414 /* This function will be called though elf_link_hash_traverse to store
4415 all hash value of the exported symbols in an array. */
4418 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
4420 unsigned long **valuep
= data
;
4426 if (h
->root
.type
== bfd_link_hash_warning
)
4427 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4429 /* Ignore indirect symbols. These are added by the versioning code. */
4430 if (h
->dynindx
== -1)
4433 name
= h
->root
.root
.string
;
4434 p
= strchr (name
, ELF_VER_CHR
);
4437 alc
= bfd_malloc (p
- name
+ 1);
4438 memcpy (alc
, name
, p
- name
);
4439 alc
[p
- name
] = '\0';
4443 /* Compute the hash value. */
4444 ha
= bfd_elf_hash (name
);
4446 /* Store the found hash value in the array given as the argument. */
4449 /* And store it in the struct so that we can put it in the hash table
4451 h
->elf_hash_value
= ha
;
4459 /* Array used to determine the number of hash table buckets to use
4460 based on the number of symbols there are. If there are fewer than
4461 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
4462 fewer than 37 we use 17 buckets, and so forth. We never use more
4463 than 32771 buckets. */
4465 static const size_t elf_buckets
[] =
4467 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
4471 /* Compute bucket count for hashing table. We do not use a static set
4472 of possible tables sizes anymore. Instead we determine for all
4473 possible reasonable sizes of the table the outcome (i.e., the
4474 number of collisions etc) and choose the best solution. The
4475 weighting functions are not too simple to allow the table to grow
4476 without bounds. Instead one of the weighting factors is the size.
4477 Therefore the result is always a good payoff between few collisions
4478 (= short chain lengths) and table size. */
4480 compute_bucket_count (struct bfd_link_info
*info
)
4482 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
4483 size_t best_size
= 0;
4484 unsigned long int *hashcodes
;
4485 unsigned long int *hashcodesp
;
4486 unsigned long int i
;
4489 /* Compute the hash values for all exported symbols. At the same
4490 time store the values in an array so that we could use them for
4493 amt
*= sizeof (unsigned long int);
4494 hashcodes
= bfd_malloc (amt
);
4495 if (hashcodes
== NULL
)
4497 hashcodesp
= hashcodes
;
4499 /* Put all hash values in HASHCODES. */
4500 elf_link_hash_traverse (elf_hash_table (info
),
4501 elf_collect_hash_codes
, &hashcodesp
);
4503 /* We have a problem here. The following code to optimize the table
4504 size requires an integer type with more the 32 bits. If
4505 BFD_HOST_U_64_BIT is set we know about such a type. */
4506 #ifdef BFD_HOST_U_64_BIT
4509 unsigned long int nsyms
= hashcodesp
- hashcodes
;
4512 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
4513 unsigned long int *counts
;
4514 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4515 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
4517 /* Possible optimization parameters: if we have NSYMS symbols we say
4518 that the hashing table must at least have NSYMS/4 and at most
4520 minsize
= nsyms
/ 4;
4523 best_size
= maxsize
= nsyms
* 2;
4525 /* Create array where we count the collisions in. We must use bfd_malloc
4526 since the size could be large. */
4528 amt
*= sizeof (unsigned long int);
4529 counts
= bfd_malloc (amt
);
4536 /* Compute the "optimal" size for the hash table. The criteria is a
4537 minimal chain length. The minor criteria is (of course) the size
4539 for (i
= minsize
; i
< maxsize
; ++i
)
4541 /* Walk through the array of hashcodes and count the collisions. */
4542 BFD_HOST_U_64_BIT max
;
4543 unsigned long int j
;
4544 unsigned long int fact
;
4546 memset (counts
, '\0', i
* sizeof (unsigned long int));
4548 /* Determine how often each hash bucket is used. */
4549 for (j
= 0; j
< nsyms
; ++j
)
4550 ++counts
[hashcodes
[j
] % i
];
4552 /* For the weight function we need some information about the
4553 pagesize on the target. This is information need not be 100%
4554 accurate. Since this information is not available (so far) we
4555 define it here to a reasonable default value. If it is crucial
4556 to have a better value some day simply define this value. */
4557 # ifndef BFD_TARGET_PAGESIZE
4558 # define BFD_TARGET_PAGESIZE (4096)
4561 /* We in any case need 2 + NSYMS entries for the size values and
4563 max
= (2 + nsyms
) * (bed
->s
->arch_size
/ 8);
4566 /* Variant 1: optimize for short chains. We add the squares
4567 of all the chain lengths (which favors many small chain
4568 over a few long chains). */
4569 for (j
= 0; j
< i
; ++j
)
4570 max
+= counts
[j
] * counts
[j
];
4572 /* This adds penalties for the overall size of the table. */
4573 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4576 /* Variant 2: Optimize a lot more for small table. Here we
4577 also add squares of the size but we also add penalties for
4578 empty slots (the +1 term). */
4579 for (j
= 0; j
< i
; ++j
)
4580 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
4582 /* The overall size of the table is considered, but not as
4583 strong as in variant 1, where it is squared. */
4584 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4588 /* Compare with current best results. */
4589 if (max
< best_chlen
)
4599 #endif /* defined (BFD_HOST_U_64_BIT) */
4601 /* This is the fallback solution if no 64bit type is available or if we
4602 are not supposed to spend much time on optimizations. We select the
4603 bucket count using a fixed set of numbers. */
4604 for (i
= 0; elf_buckets
[i
] != 0; i
++)
4606 best_size
= elf_buckets
[i
];
4607 if (dynsymcount
< elf_buckets
[i
+ 1])
4612 /* Free the arrays we needed. */
4618 /* Set up the sizes and contents of the ELF dynamic sections. This is
4619 called by the ELF linker emulation before_allocation routine. We
4620 must set the sizes of the sections before the linker sets the
4621 addresses of the various sections. */
4624 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
4627 const char *filter_shlib
,
4628 const char * const *auxiliary_filters
,
4629 struct bfd_link_info
*info
,
4630 asection
**sinterpptr
,
4631 struct bfd_elf_version_tree
*verdefs
)
4633 bfd_size_type soname_indx
;
4635 const struct elf_backend_data
*bed
;
4636 struct elf_assign_sym_version_info asvinfo
;
4640 soname_indx
= (bfd_size_type
) -1;
4642 if (!is_elf_hash_table (info
->hash
))
4645 elf_tdata (output_bfd
)->relro
= info
->relro
;
4646 if (info
->execstack
)
4647 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
4648 else if (info
->noexecstack
)
4649 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
4653 asection
*notesec
= NULL
;
4656 for (inputobj
= info
->input_bfds
;
4658 inputobj
= inputobj
->link_next
)
4662 if (inputobj
->flags
& DYNAMIC
)
4664 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
4667 if (s
->flags
& SEC_CODE
)
4676 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
4677 if (exec
&& info
->relocatable
4678 && notesec
->output_section
!= bfd_abs_section_ptr
)
4679 notesec
->output_section
->flags
|= SEC_CODE
;
4683 /* Any syms created from now on start with -1 in
4684 got.refcount/offset and plt.refcount/offset. */
4685 elf_hash_table (info
)->init_refcount
= elf_hash_table (info
)->init_offset
;
4687 /* The backend may have to create some sections regardless of whether
4688 we're dynamic or not. */
4689 bed
= get_elf_backend_data (output_bfd
);
4690 if (bed
->elf_backend_always_size_sections
4691 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
4694 dynobj
= elf_hash_table (info
)->dynobj
;
4696 /* If there were no dynamic objects in the link, there is nothing to
4701 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
4704 if (elf_hash_table (info
)->dynamic_sections_created
)
4706 struct elf_info_failed eif
;
4707 struct elf_link_hash_entry
*h
;
4709 struct bfd_elf_version_tree
*t
;
4710 struct bfd_elf_version_expr
*d
;
4711 bfd_boolean all_defined
;
4713 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
4714 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
4718 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4720 if (soname_indx
== (bfd_size_type
) -1
4721 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
4727 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
4729 info
->flags
|= DF_SYMBOLIC
;
4736 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
4738 if (indx
== (bfd_size_type
) -1
4739 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
4742 if (info
->new_dtags
)
4744 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
4745 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
4750 if (filter_shlib
!= NULL
)
4754 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4755 filter_shlib
, TRUE
);
4756 if (indx
== (bfd_size_type
) -1
4757 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
4761 if (auxiliary_filters
!= NULL
)
4763 const char * const *p
;
4765 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
4769 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4771 if (indx
== (bfd_size_type
) -1
4772 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
4778 eif
.verdefs
= verdefs
;
4781 /* If we are supposed to export all symbols into the dynamic symbol
4782 table (this is not the normal case), then do so. */
4783 if (info
->export_dynamic
)
4785 elf_link_hash_traverse (elf_hash_table (info
),
4786 _bfd_elf_export_symbol
,
4792 /* Make all global versions with definition. */
4793 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
4794 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
4795 if (!d
->symver
&& d
->symbol
)
4797 const char *verstr
, *name
;
4798 size_t namelen
, verlen
, newlen
;
4800 struct elf_link_hash_entry
*newh
;
4803 namelen
= strlen (name
);
4805 verlen
= strlen (verstr
);
4806 newlen
= namelen
+ verlen
+ 3;
4808 newname
= bfd_malloc (newlen
);
4809 if (newname
== NULL
)
4811 memcpy (newname
, name
, namelen
);
4813 /* Check the hidden versioned definition. */
4814 p
= newname
+ namelen
;
4816 memcpy (p
, verstr
, verlen
+ 1);
4817 newh
= elf_link_hash_lookup (elf_hash_table (info
),
4818 newname
, FALSE
, FALSE
,
4821 || (newh
->root
.type
!= bfd_link_hash_defined
4822 && newh
->root
.type
!= bfd_link_hash_defweak
))
4824 /* Check the default versioned definition. */
4826 memcpy (p
, verstr
, verlen
+ 1);
4827 newh
= elf_link_hash_lookup (elf_hash_table (info
),
4828 newname
, FALSE
, FALSE
,
4833 /* Mark this version if there is a definition and it is
4834 not defined in a shared object. */
4836 && ((newh
->elf_link_hash_flags
4837 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)
4838 && (newh
->root
.type
== bfd_link_hash_defined
4839 || newh
->root
.type
== bfd_link_hash_defweak
))
4843 /* Attach all the symbols to their version information. */
4844 asvinfo
.output_bfd
= output_bfd
;
4845 asvinfo
.info
= info
;
4846 asvinfo
.verdefs
= verdefs
;
4847 asvinfo
.failed
= FALSE
;
4849 elf_link_hash_traverse (elf_hash_table (info
),
4850 _bfd_elf_link_assign_sym_version
,
4855 if (!info
->allow_undefined_version
)
4857 /* Check if all global versions have a definition. */
4859 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
4860 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
4861 if (!d
->symver
&& !d
->script
)
4863 (*_bfd_error_handler
)
4864 (_("%s: undefined version: %s"),
4865 d
->pattern
, t
->name
);
4866 all_defined
= FALSE
;
4871 bfd_set_error (bfd_error_bad_value
);
4876 /* Find all symbols which were defined in a dynamic object and make
4877 the backend pick a reasonable value for them. */
4878 elf_link_hash_traverse (elf_hash_table (info
),
4879 _bfd_elf_adjust_dynamic_symbol
,
4884 /* Add some entries to the .dynamic section. We fill in some of the
4885 values later, in elf_bfd_final_link, but we must add the entries
4886 now so that we know the final size of the .dynamic section. */
4888 /* If there are initialization and/or finalization functions to
4889 call then add the corresponding DT_INIT/DT_FINI entries. */
4890 h
= (info
->init_function
4891 ? elf_link_hash_lookup (elf_hash_table (info
),
4892 info
->init_function
, FALSE
,
4896 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
4897 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
4899 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
4902 h
= (info
->fini_function
4903 ? elf_link_hash_lookup (elf_hash_table (info
),
4904 info
->fini_function
, FALSE
,
4908 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
4909 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
4911 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
4915 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
4917 /* DT_PREINIT_ARRAY is not allowed in shared library. */
4918 if (! info
->executable
)
4923 for (sub
= info
->input_bfds
; sub
!= NULL
;
4924 sub
= sub
->link_next
)
4925 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4926 if (elf_section_data (o
)->this_hdr
.sh_type
4927 == SHT_PREINIT_ARRAY
)
4929 (*_bfd_error_handler
)
4930 (_("%s: .preinit_array section is not allowed in DSO"),
4931 bfd_archive_filename (sub
));
4935 bfd_set_error (bfd_error_nonrepresentable_section
);
4939 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
4940 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
4943 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
4945 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
4946 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
4949 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
4951 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
4952 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
4956 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
4957 /* If .dynstr is excluded from the link, we don't want any of
4958 these tags. Strictly, we should be checking each section
4959 individually; This quick check covers for the case where
4960 someone does a /DISCARD/ : { *(*) }. */
4961 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
4963 bfd_size_type strsize
;
4965 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
4966 if (!_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0)
4967 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
4968 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
4969 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
4970 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
4971 bed
->s
->sizeof_sym
))
4976 /* The backend must work out the sizes of all the other dynamic
4978 if (bed
->elf_backend_size_dynamic_sections
4979 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
4982 if (elf_hash_table (info
)->dynamic_sections_created
)
4984 bfd_size_type dynsymcount
;
4986 size_t bucketcount
= 0;
4987 size_t hash_entry_size
;
4988 unsigned int dtagcount
;
4990 /* Set up the version definition section. */
4991 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
4992 BFD_ASSERT (s
!= NULL
);
4994 /* We may have created additional version definitions if we are
4995 just linking a regular application. */
4996 verdefs
= asvinfo
.verdefs
;
4998 /* Skip anonymous version tag. */
4999 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5000 verdefs
= verdefs
->next
;
5002 if (verdefs
== NULL
)
5003 _bfd_strip_section_from_output (info
, s
);
5008 struct bfd_elf_version_tree
*t
;
5010 Elf_Internal_Verdef def
;
5011 Elf_Internal_Verdaux defaux
;
5016 /* Make space for the base version. */
5017 size
+= sizeof (Elf_External_Verdef
);
5018 size
+= sizeof (Elf_External_Verdaux
);
5021 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5023 struct bfd_elf_version_deps
*n
;
5025 size
+= sizeof (Elf_External_Verdef
);
5026 size
+= sizeof (Elf_External_Verdaux
);
5029 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5030 size
+= sizeof (Elf_External_Verdaux
);
5034 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5035 if (s
->contents
== NULL
&& s
->size
!= 0)
5038 /* Fill in the version definition section. */
5042 def
.vd_version
= VER_DEF_CURRENT
;
5043 def
.vd_flags
= VER_FLG_BASE
;
5046 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5047 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5048 + sizeof (Elf_External_Verdaux
));
5050 if (soname_indx
!= (bfd_size_type
) -1)
5052 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5054 def
.vd_hash
= bfd_elf_hash (soname
);
5055 defaux
.vda_name
= soname_indx
;
5062 name
= basename (output_bfd
->filename
);
5063 def
.vd_hash
= bfd_elf_hash (name
);
5064 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5066 if (indx
== (bfd_size_type
) -1)
5068 defaux
.vda_name
= indx
;
5070 defaux
.vda_next
= 0;
5072 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5073 (Elf_External_Verdef
*) p
);
5074 p
+= sizeof (Elf_External_Verdef
);
5075 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5076 (Elf_External_Verdaux
*) p
);
5077 p
+= sizeof (Elf_External_Verdaux
);
5079 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5082 struct bfd_elf_version_deps
*n
;
5083 struct elf_link_hash_entry
*h
;
5084 struct bfd_link_hash_entry
*bh
;
5087 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5090 /* Add a symbol representing this version. */
5092 if (! (_bfd_generic_link_add_one_symbol
5093 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5095 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5097 h
= (struct elf_link_hash_entry
*) bh
;
5098 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
5099 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
5100 h
->type
= STT_OBJECT
;
5101 h
->verinfo
.vertree
= t
;
5103 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5106 def
.vd_version
= VER_DEF_CURRENT
;
5108 if (t
->globals
.list
== NULL
5109 && t
->locals
.list
== NULL
5111 def
.vd_flags
|= VER_FLG_WEAK
;
5112 def
.vd_ndx
= t
->vernum
+ 1;
5113 def
.vd_cnt
= cdeps
+ 1;
5114 def
.vd_hash
= bfd_elf_hash (t
->name
);
5115 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5117 if (t
->next
!= NULL
)
5118 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5119 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
5121 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5122 (Elf_External_Verdef
*) p
);
5123 p
+= sizeof (Elf_External_Verdef
);
5125 defaux
.vda_name
= h
->dynstr_index
;
5126 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5128 defaux
.vda_next
= 0;
5129 if (t
->deps
!= NULL
)
5130 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5131 t
->name_indx
= defaux
.vda_name
;
5133 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5134 (Elf_External_Verdaux
*) p
);
5135 p
+= sizeof (Elf_External_Verdaux
);
5137 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5139 if (n
->version_needed
== NULL
)
5141 /* This can happen if there was an error in the
5143 defaux
.vda_name
= 0;
5147 defaux
.vda_name
= n
->version_needed
->name_indx
;
5148 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5151 if (n
->next
== NULL
)
5152 defaux
.vda_next
= 0;
5154 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5156 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5157 (Elf_External_Verdaux
*) p
);
5158 p
+= sizeof (Elf_External_Verdaux
);
5162 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
5163 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
5166 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
5169 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
5171 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
5174 else if (info
->flags
& DF_BIND_NOW
)
5176 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
5182 if (info
->executable
)
5183 info
->flags_1
&= ~ (DF_1_INITFIRST
5186 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
5190 /* Work out the size of the version reference section. */
5192 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
5193 BFD_ASSERT (s
!= NULL
);
5195 struct elf_find_verdep_info sinfo
;
5197 sinfo
.output_bfd
= output_bfd
;
5199 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
5200 if (sinfo
.vers
== 0)
5202 sinfo
.failed
= FALSE
;
5204 elf_link_hash_traverse (elf_hash_table (info
),
5205 _bfd_elf_link_find_version_dependencies
,
5208 if (elf_tdata (output_bfd
)->verref
== NULL
)
5209 _bfd_strip_section_from_output (info
, s
);
5212 Elf_Internal_Verneed
*t
;
5217 /* Build the version definition section. */
5220 for (t
= elf_tdata (output_bfd
)->verref
;
5224 Elf_Internal_Vernaux
*a
;
5226 size
+= sizeof (Elf_External_Verneed
);
5228 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5229 size
+= sizeof (Elf_External_Vernaux
);
5233 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5234 if (s
->contents
== NULL
)
5238 for (t
= elf_tdata (output_bfd
)->verref
;
5243 Elf_Internal_Vernaux
*a
;
5247 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5250 t
->vn_version
= VER_NEED_CURRENT
;
5252 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5253 elf_dt_name (t
->vn_bfd
) != NULL
5254 ? elf_dt_name (t
->vn_bfd
)
5255 : basename (t
->vn_bfd
->filename
),
5257 if (indx
== (bfd_size_type
) -1)
5260 t
->vn_aux
= sizeof (Elf_External_Verneed
);
5261 if (t
->vn_nextref
== NULL
)
5264 t
->vn_next
= (sizeof (Elf_External_Verneed
)
5265 + caux
* sizeof (Elf_External_Vernaux
));
5267 _bfd_elf_swap_verneed_out (output_bfd
, t
,
5268 (Elf_External_Verneed
*) p
);
5269 p
+= sizeof (Elf_External_Verneed
);
5271 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5273 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
5274 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5275 a
->vna_nodename
, FALSE
);
5276 if (indx
== (bfd_size_type
) -1)
5279 if (a
->vna_nextptr
== NULL
)
5282 a
->vna_next
= sizeof (Elf_External_Vernaux
);
5284 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
5285 (Elf_External_Vernaux
*) p
);
5286 p
+= sizeof (Elf_External_Vernaux
);
5290 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
5291 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
5294 elf_tdata (output_bfd
)->cverrefs
= crefs
;
5298 /* Assign dynsym indicies. In a shared library we generate a
5299 section symbol for each output section, which come first.
5300 Next come all of the back-end allocated local dynamic syms,
5301 followed by the rest of the global symbols. */
5303 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5305 /* Work out the size of the symbol version section. */
5306 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
5307 BFD_ASSERT (s
!= NULL
);
5308 if (dynsymcount
== 0
5309 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
5311 _bfd_strip_section_from_output (info
, s
);
5312 /* The DYNSYMCOUNT might have changed if we were going to
5313 output a dynamic symbol table entry for S. */
5314 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5318 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
5319 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
5320 if (s
->contents
== NULL
)
5323 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
5327 /* Set the size of the .dynsym and .hash sections. We counted
5328 the number of dynamic symbols in elf_link_add_object_symbols.
5329 We will build the contents of .dynsym and .hash when we build
5330 the final symbol table, because until then we do not know the
5331 correct value to give the symbols. We built the .dynstr
5332 section as we went along in elf_link_add_object_symbols. */
5333 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
5334 BFD_ASSERT (s
!= NULL
);
5335 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
5336 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5337 if (s
->contents
== NULL
&& s
->size
!= 0)
5340 if (dynsymcount
!= 0)
5342 Elf_Internal_Sym isym
;
5344 /* The first entry in .dynsym is a dummy symbol. */
5351 bed
->s
->swap_symbol_out (output_bfd
, &isym
, s
->contents
, 0);
5354 /* Compute the size of the hashing table. As a side effect this
5355 computes the hash values for all the names we export. */
5356 bucketcount
= compute_bucket_count (info
);
5358 s
= bfd_get_section_by_name (dynobj
, ".hash");
5359 BFD_ASSERT (s
!= NULL
);
5360 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
5361 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
5362 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
5363 if (s
->contents
== NULL
)
5366 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
5367 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
5368 s
->contents
+ hash_entry_size
);
5370 elf_hash_table (info
)->bucketcount
= bucketcount
;
5372 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
5373 BFD_ASSERT (s
!= NULL
);
5375 elf_finalize_dynstr (output_bfd
, info
);
5377 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5379 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
5380 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
5387 /* Final phase of ELF linker. */
5389 /* A structure we use to avoid passing large numbers of arguments. */
5391 struct elf_final_link_info
5393 /* General link information. */
5394 struct bfd_link_info
*info
;
5397 /* Symbol string table. */
5398 struct bfd_strtab_hash
*symstrtab
;
5399 /* .dynsym section. */
5400 asection
*dynsym_sec
;
5401 /* .hash section. */
5403 /* symbol version section (.gnu.version). */
5404 asection
*symver_sec
;
5405 /* Buffer large enough to hold contents of any section. */
5407 /* Buffer large enough to hold external relocs of any section. */
5408 void *external_relocs
;
5409 /* Buffer large enough to hold internal relocs of any section. */
5410 Elf_Internal_Rela
*internal_relocs
;
5411 /* Buffer large enough to hold external local symbols of any input
5413 bfd_byte
*external_syms
;
5414 /* And a buffer for symbol section indices. */
5415 Elf_External_Sym_Shndx
*locsym_shndx
;
5416 /* Buffer large enough to hold internal local symbols of any input
5418 Elf_Internal_Sym
*internal_syms
;
5419 /* Array large enough to hold a symbol index for each local symbol
5420 of any input BFD. */
5422 /* Array large enough to hold a section pointer for each local
5423 symbol of any input BFD. */
5424 asection
**sections
;
5425 /* Buffer to hold swapped out symbols. */
5427 /* And one for symbol section indices. */
5428 Elf_External_Sym_Shndx
*symshndxbuf
;
5429 /* Number of swapped out symbols in buffer. */
5430 size_t symbuf_count
;
5431 /* Number of symbols which fit in symbuf. */
5433 /* And same for symshndxbuf. */
5434 size_t shndxbuf_size
;
5437 /* This struct is used to pass information to elf_link_output_extsym. */
5439 struct elf_outext_info
5442 bfd_boolean localsyms
;
5443 struct elf_final_link_info
*finfo
;
5446 /* When performing a relocatable link, the input relocations are
5447 preserved. But, if they reference global symbols, the indices
5448 referenced must be updated. Update all the relocations in
5449 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
5452 elf_link_adjust_relocs (bfd
*abfd
,
5453 Elf_Internal_Shdr
*rel_hdr
,
5455 struct elf_link_hash_entry
**rel_hash
)
5458 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5460 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5461 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5462 bfd_vma r_type_mask
;
5465 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
5467 swap_in
= bed
->s
->swap_reloc_in
;
5468 swap_out
= bed
->s
->swap_reloc_out
;
5470 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
5472 swap_in
= bed
->s
->swap_reloca_in
;
5473 swap_out
= bed
->s
->swap_reloca_out
;
5478 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
5481 if (bed
->s
->arch_size
== 32)
5488 r_type_mask
= 0xffffffff;
5492 erela
= rel_hdr
->contents
;
5493 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
5495 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
5498 if (*rel_hash
== NULL
)
5501 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
5503 (*swap_in
) (abfd
, erela
, irela
);
5504 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
5505 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
5506 | (irela
[j
].r_info
& r_type_mask
));
5507 (*swap_out
) (abfd
, irela
, erela
);
5511 struct elf_link_sort_rela
5517 enum elf_reloc_type_class type
;
5518 /* We use this as an array of size int_rels_per_ext_rel. */
5519 Elf_Internal_Rela rela
[1];
5523 elf_link_sort_cmp1 (const void *A
, const void *B
)
5525 const struct elf_link_sort_rela
*a
= A
;
5526 const struct elf_link_sort_rela
*b
= B
;
5527 int relativea
, relativeb
;
5529 relativea
= a
->type
== reloc_class_relative
;
5530 relativeb
= b
->type
== reloc_class_relative
;
5532 if (relativea
< relativeb
)
5534 if (relativea
> relativeb
)
5536 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
5538 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
5540 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5542 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5548 elf_link_sort_cmp2 (const void *A
, const void *B
)
5550 const struct elf_link_sort_rela
*a
= A
;
5551 const struct elf_link_sort_rela
*b
= B
;
5554 if (a
->u
.offset
< b
->u
.offset
)
5556 if (a
->u
.offset
> b
->u
.offset
)
5558 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
5559 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
5564 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5566 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5572 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
5575 bfd_size_type count
, size
;
5576 size_t i
, ret
, sort_elt
, ext_size
;
5577 bfd_byte
*sort
, *s_non_relative
, *p
;
5578 struct elf_link_sort_rela
*sq
;
5579 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5580 int i2e
= bed
->s
->int_rels_per_ext_rel
;
5581 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5582 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5583 struct bfd_link_order
*lo
;
5586 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
5587 if (reldyn
== NULL
|| reldyn
->size
== 0)
5589 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
5590 if (reldyn
== NULL
|| reldyn
->size
== 0)
5592 ext_size
= bed
->s
->sizeof_rel
;
5593 swap_in
= bed
->s
->swap_reloc_in
;
5594 swap_out
= bed
->s
->swap_reloc_out
;
5598 ext_size
= bed
->s
->sizeof_rela
;
5599 swap_in
= bed
->s
->swap_reloca_in
;
5600 swap_out
= bed
->s
->swap_reloca_out
;
5602 count
= reldyn
->size
/ ext_size
;
5605 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5606 if (lo
->type
== bfd_indirect_link_order
)
5608 asection
*o
= lo
->u
.indirect
.section
;
5612 if (size
!= reldyn
->size
)
5615 sort_elt
= (sizeof (struct elf_link_sort_rela
)
5616 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
5617 sort
= bfd_zmalloc (sort_elt
* count
);
5620 (*info
->callbacks
->warning
)
5621 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
5625 if (bed
->s
->arch_size
== 32)
5626 r_sym_mask
= ~(bfd_vma
) 0xff;
5628 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
5630 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5631 if (lo
->type
== bfd_indirect_link_order
)
5633 bfd_byte
*erel
, *erelend
;
5634 asection
*o
= lo
->u
.indirect
.section
;
5637 erelend
= o
->contents
+ o
->size
;
5638 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5639 while (erel
< erelend
)
5641 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5642 (*swap_in
) (abfd
, erel
, s
->rela
);
5643 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
5644 s
->u
.sym_mask
= r_sym_mask
;
5650 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
5652 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
5654 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5655 if (s
->type
!= reloc_class_relative
)
5661 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
5662 for (; i
< count
; i
++, p
+= sort_elt
)
5664 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
5665 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
5667 sp
->u
.offset
= sq
->rela
->r_offset
;
5670 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
5672 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5673 if (lo
->type
== bfd_indirect_link_order
)
5675 bfd_byte
*erel
, *erelend
;
5676 asection
*o
= lo
->u
.indirect
.section
;
5679 erelend
= o
->contents
+ o
->size
;
5680 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5681 while (erel
< erelend
)
5683 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5684 (*swap_out
) (abfd
, s
->rela
, erel
);
5695 /* Flush the output symbols to the file. */
5698 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
5699 const struct elf_backend_data
*bed
)
5701 if (finfo
->symbuf_count
> 0)
5703 Elf_Internal_Shdr
*hdr
;
5707 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5708 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5709 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
5710 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5711 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5714 hdr
->sh_size
+= amt
;
5715 finfo
->symbuf_count
= 0;
5721 /* Add a symbol to the output symbol table. */
5724 elf_link_output_sym (struct elf_final_link_info
*finfo
,
5726 Elf_Internal_Sym
*elfsym
,
5727 asection
*input_sec
,
5728 struct elf_link_hash_entry
*h
)
5731 Elf_External_Sym_Shndx
*destshndx
;
5732 bfd_boolean (*output_symbol_hook
)
5733 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
5734 struct elf_link_hash_entry
*);
5735 const struct elf_backend_data
*bed
;
5737 bed
= get_elf_backend_data (finfo
->output_bfd
);
5738 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
5739 if (output_symbol_hook
!= NULL
)
5741 if (! (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
))
5745 if (name
== NULL
|| *name
== '\0')
5746 elfsym
->st_name
= 0;
5747 else if (input_sec
->flags
& SEC_EXCLUDE
)
5748 elfsym
->st_name
= 0;
5751 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5753 if (elfsym
->st_name
== (unsigned long) -1)
5757 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5759 if (! elf_link_flush_output_syms (finfo
, bed
))
5763 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
5764 destshndx
= finfo
->symshndxbuf
;
5765 if (destshndx
!= NULL
)
5767 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
5771 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
5772 finfo
->symshndxbuf
= destshndx
= bfd_realloc (destshndx
, amt
* 2);
5773 if (destshndx
== NULL
)
5775 memset ((char *) destshndx
+ amt
, 0, amt
);
5776 finfo
->shndxbuf_size
*= 2;
5778 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
5781 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
5782 finfo
->symbuf_count
+= 1;
5783 bfd_get_symcount (finfo
->output_bfd
) += 1;
5788 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
5789 allowing an unsatisfied unversioned symbol in the DSO to match a
5790 versioned symbol that would normally require an explicit version.
5791 We also handle the case that a DSO references a hidden symbol
5792 which may be satisfied by a versioned symbol in another DSO. */
5795 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
5796 const struct elf_backend_data
*bed
,
5797 struct elf_link_hash_entry
*h
)
5800 struct elf_link_loaded_list
*loaded
;
5802 if (!is_elf_hash_table (info
->hash
))
5805 switch (h
->root
.type
)
5811 case bfd_link_hash_undefined
:
5812 case bfd_link_hash_undefweak
:
5813 abfd
= h
->root
.u
.undef
.abfd
;
5814 if ((abfd
->flags
& DYNAMIC
) == 0
5815 || elf_dyn_lib_class (abfd
) != DYN_DT_NEEDED
)
5819 case bfd_link_hash_defined
:
5820 case bfd_link_hash_defweak
:
5821 abfd
= h
->root
.u
.def
.section
->owner
;
5824 case bfd_link_hash_common
:
5825 abfd
= h
->root
.u
.c
.p
->section
->owner
;
5828 BFD_ASSERT (abfd
!= NULL
);
5830 for (loaded
= elf_hash_table (info
)->loaded
;
5832 loaded
= loaded
->next
)
5835 Elf_Internal_Shdr
*hdr
;
5836 bfd_size_type symcount
;
5837 bfd_size_type extsymcount
;
5838 bfd_size_type extsymoff
;
5839 Elf_Internal_Shdr
*versymhdr
;
5840 Elf_Internal_Sym
*isym
;
5841 Elf_Internal_Sym
*isymend
;
5842 Elf_Internal_Sym
*isymbuf
;
5843 Elf_External_Versym
*ever
;
5844 Elf_External_Versym
*extversym
;
5846 input
= loaded
->abfd
;
5848 /* We check each DSO for a possible hidden versioned definition. */
5850 || (input
->flags
& DYNAMIC
) == 0
5851 || elf_dynversym (input
) == 0)
5854 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
5856 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
5857 if (elf_bad_symtab (input
))
5859 extsymcount
= symcount
;
5864 extsymcount
= symcount
- hdr
->sh_info
;
5865 extsymoff
= hdr
->sh_info
;
5868 if (extsymcount
== 0)
5871 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
5873 if (isymbuf
== NULL
)
5876 /* Read in any version definitions. */
5877 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
5878 extversym
= bfd_malloc (versymhdr
->sh_size
);
5879 if (extversym
== NULL
)
5882 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
5883 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
5884 != versymhdr
->sh_size
))
5892 ever
= extversym
+ extsymoff
;
5893 isymend
= isymbuf
+ extsymcount
;
5894 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
5897 Elf_Internal_Versym iver
;
5898 unsigned short version_index
;
5900 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
5901 || isym
->st_shndx
== SHN_UNDEF
)
5904 name
= bfd_elf_string_from_elf_section (input
,
5907 if (strcmp (name
, h
->root
.root
.string
) != 0)
5910 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
5912 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
5914 /* If we have a non-hidden versioned sym, then it should
5915 have provided a definition for the undefined sym. */
5919 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
5920 if (version_index
== 1 || version_index
== 2)
5922 /* This is the base or first version. We can use it. */
5936 /* Add an external symbol to the symbol table. This is called from
5937 the hash table traversal routine. When generating a shared object,
5938 we go through the symbol table twice. The first time we output
5939 anything that might have been forced to local scope in a version
5940 script. The second time we output the symbols that are still
5944 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
5946 struct elf_outext_info
*eoinfo
= data
;
5947 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5949 Elf_Internal_Sym sym
;
5950 asection
*input_sec
;
5951 const struct elf_backend_data
*bed
;
5953 if (h
->root
.type
== bfd_link_hash_warning
)
5955 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5956 if (h
->root
.type
== bfd_link_hash_new
)
5960 /* Decide whether to output this symbol in this pass. */
5961 if (eoinfo
->localsyms
)
5963 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5968 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5972 bed
= get_elf_backend_data (finfo
->output_bfd
);
5974 /* If we have an undefined symbol reference here then it must have
5975 come from a shared library that is being linked in. (Undefined
5976 references in regular files have already been handled). If we
5977 are reporting errors for this situation then do so now. */
5978 if (h
->root
.type
== bfd_link_hash_undefined
5979 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5980 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
5981 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
5982 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
5984 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5985 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5986 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
5988 eoinfo
->failed
= TRUE
;
5993 /* We should also warn if a forced local symbol is referenced from
5994 shared libraries. */
5995 if (! finfo
->info
->relocatable
5996 && (! finfo
->info
->shared
)
5997 && (h
->elf_link_hash_flags
5998 & (ELF_LINK_FORCED_LOCAL
| ELF_LINK_HASH_REF_DYNAMIC
| ELF_LINK_DYNAMIC_DEF
| ELF_LINK_DYNAMIC_WEAK
))
5999 == (ELF_LINK_FORCED_LOCAL
| ELF_LINK_HASH_REF_DYNAMIC
)
6000 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
6002 (*_bfd_error_handler
)
6003 (_("%s: %s symbol `%s' in %s is referenced by DSO"),
6004 bfd_get_filename (finfo
->output_bfd
),
6005 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
6007 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
6008 ? "hidden" : "local",
6009 h
->root
.root
.string
,
6010 bfd_archive_filename (h
->root
.u
.def
.section
->owner
));
6011 eoinfo
->failed
= TRUE
;
6015 /* We don't want to output symbols that have never been mentioned by
6016 a regular file, or that we have been told to strip. However, if
6017 h->indx is set to -2, the symbol is used by a reloc and we must
6021 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
6022 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
6023 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
6024 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
6026 else if (finfo
->info
->strip
== strip_all
)
6028 else if (finfo
->info
->strip
== strip_some
6029 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6030 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
6032 else if (finfo
->info
->strip_discarded
6033 && (h
->root
.type
== bfd_link_hash_defined
6034 || h
->root
.type
== bfd_link_hash_defweak
)
6035 && elf_discarded_section (h
->root
.u
.def
.section
))
6040 /* If we're stripping it, and it's not a dynamic symbol, there's
6041 nothing else to do unless it is a forced local symbol. */
6044 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6048 sym
.st_size
= h
->size
;
6049 sym
.st_other
= h
->other
;
6050 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6051 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6052 else if (h
->root
.type
== bfd_link_hash_undefweak
6053 || h
->root
.type
== bfd_link_hash_defweak
)
6054 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6056 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6058 switch (h
->root
.type
)
6061 case bfd_link_hash_new
:
6062 case bfd_link_hash_warning
:
6066 case bfd_link_hash_undefined
:
6067 case bfd_link_hash_undefweak
:
6068 input_sec
= bfd_und_section_ptr
;
6069 sym
.st_shndx
= SHN_UNDEF
;
6072 case bfd_link_hash_defined
:
6073 case bfd_link_hash_defweak
:
6075 input_sec
= h
->root
.u
.def
.section
;
6076 if (input_sec
->output_section
!= NULL
)
6079 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6080 input_sec
->output_section
);
6081 if (sym
.st_shndx
== SHN_BAD
)
6083 char *sec_name
= bfd_get_section_ident (input_sec
);
6084 (*_bfd_error_handler
)
6085 (_("%s: could not find output section %s for input section %s"),
6086 bfd_get_filename (finfo
->output_bfd
),
6087 input_sec
->output_section
->name
,
6088 sec_name
? sec_name
: input_sec
->name
);
6091 eoinfo
->failed
= TRUE
;
6095 /* ELF symbols in relocatable files are section relative,
6096 but in nonrelocatable files they are virtual
6098 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6099 if (! finfo
->info
->relocatable
)
6101 sym
.st_value
+= input_sec
->output_section
->vma
;
6102 if (h
->type
== STT_TLS
)
6104 /* STT_TLS symbols are relative to PT_TLS segment
6106 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6107 sym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6113 BFD_ASSERT (input_sec
->owner
== NULL
6114 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6115 sym
.st_shndx
= SHN_UNDEF
;
6116 input_sec
= bfd_und_section_ptr
;
6121 case bfd_link_hash_common
:
6122 input_sec
= h
->root
.u
.c
.p
->section
;
6123 sym
.st_shndx
= SHN_COMMON
;
6124 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6127 case bfd_link_hash_indirect
:
6128 /* These symbols are created by symbol versioning. They point
6129 to the decorated version of the name. For example, if the
6130 symbol foo@@GNU_1.2 is the default, which should be used when
6131 foo is used with no version, then we add an indirect symbol
6132 foo which points to foo@@GNU_1.2. We ignore these symbols,
6133 since the indirected symbol is already in the hash table. */
6137 /* Give the processor backend a chance to tweak the symbol value,
6138 and also to finish up anything that needs to be done for this
6139 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6140 forced local syms when non-shared is due to a historical quirk. */
6141 if ((h
->dynindx
!= -1
6142 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6143 && ((finfo
->info
->shared
6144 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
6145 || h
->root
.type
!= bfd_link_hash_undefweak
))
6146 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6147 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6149 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6150 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6152 eoinfo
->failed
= TRUE
;
6157 /* If we are marking the symbol as undefined, and there are no
6158 non-weak references to this symbol from a regular object, then
6159 mark the symbol as weak undefined; if there are non-weak
6160 references, mark the symbol as strong. We can't do this earlier,
6161 because it might not be marked as undefined until the
6162 finish_dynamic_symbol routine gets through with it. */
6163 if (sym
.st_shndx
== SHN_UNDEF
6164 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6165 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6166 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6170 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6171 bindtype
= STB_GLOBAL
;
6173 bindtype
= STB_WEAK
;
6174 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6177 /* If a non-weak symbol with non-default visibility is not defined
6178 locally, it is a fatal error. */
6179 if (! finfo
->info
->relocatable
6180 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
6181 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
6182 && h
->root
.type
== bfd_link_hash_undefined
6183 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6185 (*_bfd_error_handler
)
6186 (_("%s: %s symbol `%s' isn't defined"),
6187 bfd_get_filename (finfo
->output_bfd
),
6188 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
6190 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
6191 ? "internal" : "hidden",
6192 h
->root
.root
.string
);
6193 eoinfo
->failed
= TRUE
;
6197 /* If this symbol should be put in the .dynsym section, then put it
6198 there now. We already know the symbol index. We also fill in
6199 the entry in the .hash section. */
6200 if (h
->dynindx
!= -1
6201 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6205 size_t hash_entry_size
;
6206 bfd_byte
*bucketpos
;
6210 sym
.st_name
= h
->dynstr_index
;
6211 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
6212 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
6214 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6215 bucket
= h
->elf_hash_value
% bucketcount
;
6217 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6218 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6219 + (bucket
+ 2) * hash_entry_size
);
6220 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6221 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
6222 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6223 ((bfd_byte
*) finfo
->hash_sec
->contents
6224 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6226 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6228 Elf_Internal_Versym iversym
;
6229 Elf_External_Versym
*eversym
;
6231 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6233 if (h
->verinfo
.verdef
== NULL
)
6234 iversym
.vs_vers
= 0;
6236 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6240 if (h
->verinfo
.vertree
== NULL
)
6241 iversym
.vs_vers
= 1;
6243 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6246 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6247 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6249 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6250 eversym
+= h
->dynindx
;
6251 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6255 /* If we're stripping it, then it was just a dynamic symbol, and
6256 there's nothing else to do. */
6257 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
6260 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6262 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
))
6264 eoinfo
->failed
= TRUE
;
6271 /* Return TRUE if special handling is done for relocs in SEC against
6272 symbols defined in discarded sections. */
6275 elf_section_ignore_discarded_relocs (asection
*sec
)
6277 const struct elf_backend_data
*bed
;
6279 switch (sec
->sec_info_type
)
6281 case ELF_INFO_TYPE_STABS
:
6282 case ELF_INFO_TYPE_EH_FRAME
:
6288 bed
= get_elf_backend_data (sec
->owner
);
6289 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
6290 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
6296 /* Return TRUE if we should complain about a reloc in SEC against a
6297 symbol defined in a discarded section. */
6300 elf_section_complain_discarded (asection
*sec
)
6302 if (strncmp (".stab", sec
->name
, 5) == 0
6303 && (!sec
->name
[5] ||
6304 (sec
->name
[5] == '.' && ISDIGIT (sec
->name
[6]))))
6307 if (strcmp (".eh_frame", sec
->name
) == 0)
6310 if (strcmp (".gcc_except_table", sec
->name
) == 0)
6316 /* Link an input file into the linker output file. This function
6317 handles all the sections and relocations of the input file at once.
6318 This is so that we only have to read the local symbols once, and
6319 don't have to keep them in memory. */
6322 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
6324 bfd_boolean (*relocate_section
)
6325 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
6326 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
6328 Elf_Internal_Shdr
*symtab_hdr
;
6331 Elf_Internal_Sym
*isymbuf
;
6332 Elf_Internal_Sym
*isym
;
6333 Elf_Internal_Sym
*isymend
;
6335 asection
**ppsection
;
6337 const struct elf_backend_data
*bed
;
6338 bfd_boolean emit_relocs
;
6339 struct elf_link_hash_entry
**sym_hashes
;
6341 output_bfd
= finfo
->output_bfd
;
6342 bed
= get_elf_backend_data (output_bfd
);
6343 relocate_section
= bed
->elf_backend_relocate_section
;
6345 /* If this is a dynamic object, we don't want to do anything here:
6346 we don't want the local symbols, and we don't want the section
6348 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6351 emit_relocs
= (finfo
->info
->relocatable
6352 || finfo
->info
->emitrelocations
6353 || bed
->elf_backend_emit_relocs
);
6355 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6356 if (elf_bad_symtab (input_bfd
))
6358 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
6363 locsymcount
= symtab_hdr
->sh_info
;
6364 extsymoff
= symtab_hdr
->sh_info
;
6367 /* Read the local symbols. */
6368 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6369 if (isymbuf
== NULL
&& locsymcount
!= 0)
6371 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6372 finfo
->internal_syms
,
6373 finfo
->external_syms
,
6374 finfo
->locsym_shndx
);
6375 if (isymbuf
== NULL
)
6379 /* Find local symbol sections and adjust values of symbols in
6380 SEC_MERGE sections. Write out those local symbols we know are
6381 going into the output file. */
6382 isymend
= isymbuf
+ locsymcount
;
6383 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
6385 isym
++, pindex
++, ppsection
++)
6389 Elf_Internal_Sym osym
;
6393 if (elf_bad_symtab (input_bfd
))
6395 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6402 if (isym
->st_shndx
== SHN_UNDEF
)
6403 isec
= bfd_und_section_ptr
;
6404 else if (isym
->st_shndx
< SHN_LORESERVE
6405 || isym
->st_shndx
> SHN_HIRESERVE
)
6407 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
6409 && isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
6410 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6412 _bfd_merged_section_offset (output_bfd
, &isec
,
6413 elf_section_data (isec
)->sec_info
,
6416 else if (isym
->st_shndx
== SHN_ABS
)
6417 isec
= bfd_abs_section_ptr
;
6418 else if (isym
->st_shndx
== SHN_COMMON
)
6419 isec
= bfd_com_section_ptr
;
6428 /* Don't output the first, undefined, symbol. */
6429 if (ppsection
== finfo
->sections
)
6432 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6434 /* We never output section symbols. Instead, we use the
6435 section symbol of the corresponding section in the output
6440 /* If we are stripping all symbols, we don't want to output this
6442 if (finfo
->info
->strip
== strip_all
)
6445 /* If we are discarding all local symbols, we don't want to
6446 output this one. If we are generating a relocatable output
6447 file, then some of the local symbols may be required by
6448 relocs; we output them below as we discover that they are
6450 if (finfo
->info
->discard
== discard_all
)
6453 /* If this symbol is defined in a section which we are
6454 discarding, we don't need to keep it, but note that
6455 linker_mark is only reliable for sections that have contents.
6456 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6457 as well as linker_mark. */
6458 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6460 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6461 || (! finfo
->info
->relocatable
6462 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6465 /* Get the name of the symbol. */
6466 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6471 /* See if we are discarding symbols with this name. */
6472 if ((finfo
->info
->strip
== strip_some
6473 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
6475 || (((finfo
->info
->discard
== discard_sec_merge
6476 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
6477 || finfo
->info
->discard
== discard_l
)
6478 && bfd_is_local_label_name (input_bfd
, name
)))
6481 /* If we get here, we are going to output this symbol. */
6485 /* Adjust the section index for the output file. */
6486 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6487 isec
->output_section
);
6488 if (osym
.st_shndx
== SHN_BAD
)
6491 *pindex
= bfd_get_symcount (output_bfd
);
6493 /* ELF symbols in relocatable files are section relative, but
6494 in executable files they are virtual addresses. Note that
6495 this code assumes that all ELF sections have an associated
6496 BFD section with a reasonable value for output_offset; below
6497 we assume that they also have a reasonable value for
6498 output_section. Any special sections must be set up to meet
6499 these requirements. */
6500 osym
.st_value
+= isec
->output_offset
;
6501 if (! finfo
->info
->relocatable
)
6503 osym
.st_value
+= isec
->output_section
->vma
;
6504 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
6506 /* STT_TLS symbols are relative to PT_TLS segment base. */
6507 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6508 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6512 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
))
6516 /* Relocate the contents of each section. */
6517 sym_hashes
= elf_sym_hashes (input_bfd
);
6518 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6522 if (! o
->linker_mark
)
6524 /* This section was omitted from the link. */
6528 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6529 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6532 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6534 /* Section was created by _bfd_elf_link_create_dynamic_sections
6539 /* Get the contents of the section. They have been cached by a
6540 relaxation routine. Note that o is a section in an input
6541 file, so the contents field will not have been set by any of
6542 the routines which work on output files. */
6543 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6544 contents
= elf_section_data (o
)->this_hdr
.contents
;
6547 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
6549 contents
= finfo
->contents
;
6550 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
6554 if ((o
->flags
& SEC_RELOC
) != 0)
6556 Elf_Internal_Rela
*internal_relocs
;
6557 bfd_vma r_type_mask
;
6560 /* Get the swapped relocs. */
6562 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
6563 finfo
->internal_relocs
, FALSE
);
6564 if (internal_relocs
== NULL
6565 && o
->reloc_count
> 0)
6568 if (bed
->s
->arch_size
== 32)
6575 r_type_mask
= 0xffffffff;
6579 /* Run through the relocs looking for any against symbols
6580 from discarded sections and section symbols from
6581 removed link-once sections. Complain about relocs
6582 against discarded sections. Zero relocs against removed
6583 link-once sections. Preserve debug information as much
6585 if (!elf_section_ignore_discarded_relocs (o
))
6587 Elf_Internal_Rela
*rel
, *relend
;
6588 bfd_boolean complain
= elf_section_complain_discarded (o
);
6590 rel
= internal_relocs
;
6591 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6592 for ( ; rel
< relend
; rel
++)
6594 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
6595 asection
**ps
, *sec
;
6596 struct elf_link_hash_entry
*h
= NULL
;
6597 const char *sym_name
;
6599 if (r_symndx
>= locsymcount
6600 || (elf_bad_symtab (input_bfd
)
6601 && finfo
->sections
[r_symndx
] == NULL
))
6603 h
= sym_hashes
[r_symndx
- extsymoff
];
6604 while (h
->root
.type
== bfd_link_hash_indirect
6605 || h
->root
.type
== bfd_link_hash_warning
)
6606 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6608 if (h
->root
.type
!= bfd_link_hash_defined
6609 && h
->root
.type
!= bfd_link_hash_defweak
)
6612 ps
= &h
->root
.u
.def
.section
;
6613 sym_name
= h
->root
.root
.string
;
6617 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
6618 ps
= &finfo
->sections
[r_symndx
];
6619 sym_name
= bfd_elf_local_sym_name (input_bfd
, sym
);
6622 /* Complain if the definition comes from a
6623 discarded section. */
6624 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
6626 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6628 BFD_ASSERT (r_symndx
!= 0);
6630 /* Try to preserve debug information.
6631 FIXME: This is quite broken. Modifying
6632 the symbol here means we will be changing
6633 all uses of the symbol, not just those in
6634 debug sections. The only thing that makes
6635 this half reasonable is that debug sections
6636 tend to come after other sections. Of
6637 course, that doesn't help with globals.
6638 ??? All link-once sections of the same name
6639 ought to define the same set of symbols, so
6640 it would seem that globals ought to always
6641 be defined in the kept section. */
6642 if (sec
->kept_section
!= NULL
6643 && sec
->size
== sec
->kept_section
->size
)
6645 *ps
= sec
->kept_section
;
6652 = bfd_get_section_ident (o
);
6654 = bfd_get_section_ident (sec
);
6655 finfo
->info
->callbacks
->error_handler
6656 (LD_DEFINITION_IN_DISCARDED_SECTION
,
6657 _("`%T' referenced in section `%s' of %B: "
6658 "defined in discarded section `%s' of %B\n"),
6660 r_sec
? r_sec
: o
->name
, input_bfd
,
6661 d_sec
? d_sec
: sec
->name
, sec
->owner
);
6668 /* Remove the symbol reference from the reloc, but
6669 don't kill the reloc completely. This is so that
6670 a zero value will be written into the section,
6671 which may have non-zero contents put there by the
6672 assembler. Zero in things like an eh_frame fde
6673 pc_begin allows stack unwinders to recognize the
6675 rel
->r_info
&= r_type_mask
;
6681 /* Relocate the section by invoking a back end routine.
6683 The back end routine is responsible for adjusting the
6684 section contents as necessary, and (if using Rela relocs
6685 and generating a relocatable output file) adjusting the
6686 reloc addend as necessary.
6688 The back end routine does not have to worry about setting
6689 the reloc address or the reloc symbol index.
6691 The back end routine is given a pointer to the swapped in
6692 internal symbols, and can access the hash table entries
6693 for the external symbols via elf_sym_hashes (input_bfd).
6695 When generating relocatable output, the back end routine
6696 must handle STB_LOCAL/STT_SECTION symbols specially. The
6697 output symbol is going to be a section symbol
6698 corresponding to the output section, which will require
6699 the addend to be adjusted. */
6701 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6702 input_bfd
, o
, contents
,
6710 Elf_Internal_Rela
*irela
;
6711 Elf_Internal_Rela
*irelaend
;
6712 bfd_vma last_offset
;
6713 struct elf_link_hash_entry
**rel_hash
;
6714 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
6715 unsigned int next_erel
;
6716 bfd_boolean (*reloc_emitter
)
6717 (bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*);
6718 bfd_boolean rela_normal
;
6720 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6721 rela_normal
= (bed
->rela_normal
6722 && (input_rel_hdr
->sh_entsize
6723 == bed
->s
->sizeof_rela
));
6725 /* Adjust the reloc addresses and symbol indices. */
6727 irela
= internal_relocs
;
6728 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6729 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6730 + elf_section_data (o
->output_section
)->rel_count
6731 + elf_section_data (o
->output_section
)->rel_count2
);
6732 last_offset
= o
->output_offset
;
6733 if (!finfo
->info
->relocatable
)
6734 last_offset
+= o
->output_section
->vma
;
6735 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6737 unsigned long r_symndx
;
6739 Elf_Internal_Sym sym
;
6741 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6747 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
6750 if (irela
->r_offset
>= (bfd_vma
) -2)
6752 /* This is a reloc for a deleted entry or somesuch.
6753 Turn it into an R_*_NONE reloc, at the same
6754 offset as the last reloc. elf_eh_frame.c and
6755 elf_bfd_discard_info rely on reloc offsets
6757 irela
->r_offset
= last_offset
;
6759 irela
->r_addend
= 0;
6763 irela
->r_offset
+= o
->output_offset
;
6765 /* Relocs in an executable have to be virtual addresses. */
6766 if (!finfo
->info
->relocatable
)
6767 irela
->r_offset
+= o
->output_section
->vma
;
6769 last_offset
= irela
->r_offset
;
6771 r_symndx
= irela
->r_info
>> r_sym_shift
;
6772 if (r_symndx
== STN_UNDEF
)
6775 if (r_symndx
>= locsymcount
6776 || (elf_bad_symtab (input_bfd
)
6777 && finfo
->sections
[r_symndx
] == NULL
))
6779 struct elf_link_hash_entry
*rh
;
6782 /* This is a reloc against a global symbol. We
6783 have not yet output all the local symbols, so
6784 we do not know the symbol index of any global
6785 symbol. We set the rel_hash entry for this
6786 reloc to point to the global hash table entry
6787 for this symbol. The symbol index is then
6788 set at the end of elf_bfd_final_link. */
6789 indx
= r_symndx
- extsymoff
;
6790 rh
= elf_sym_hashes (input_bfd
)[indx
];
6791 while (rh
->root
.type
== bfd_link_hash_indirect
6792 || rh
->root
.type
== bfd_link_hash_warning
)
6793 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6795 /* Setting the index to -2 tells
6796 elf_link_output_extsym that this symbol is
6798 BFD_ASSERT (rh
->indx
< 0);
6806 /* This is a reloc against a local symbol. */
6809 sym
= isymbuf
[r_symndx
];
6810 sec
= finfo
->sections
[r_symndx
];
6811 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
6813 /* I suppose the backend ought to fill in the
6814 section of any STT_SECTION symbol against a
6815 processor specific section. */
6817 if (bfd_is_abs_section (sec
))
6819 else if (sec
== NULL
|| sec
->owner
== NULL
)
6821 bfd_set_error (bfd_error_bad_value
);
6826 asection
*osec
= sec
->output_section
;
6828 /* If we have discarded a section, the output
6829 section will be the absolute section. In
6830 case of discarded link-once and discarded
6831 SEC_MERGE sections, use the kept section. */
6832 if (bfd_is_abs_section (osec
)
6833 && sec
->kept_section
!= NULL
6834 && sec
->kept_section
->output_section
!= NULL
)
6836 osec
= sec
->kept_section
->output_section
;
6837 irela
->r_addend
-= osec
->vma
;
6840 if (!bfd_is_abs_section (osec
))
6842 r_symndx
= osec
->target_index
;
6843 BFD_ASSERT (r_symndx
!= 0);
6847 /* Adjust the addend according to where the
6848 section winds up in the output section. */
6850 irela
->r_addend
+= sec
->output_offset
;
6854 if (finfo
->indices
[r_symndx
] == -1)
6856 unsigned long shlink
;
6860 if (finfo
->info
->strip
== strip_all
)
6862 /* You can't do ld -r -s. */
6863 bfd_set_error (bfd_error_invalid_operation
);
6867 /* This symbol was skipped earlier, but
6868 since it is needed by a reloc, we
6869 must output it now. */
6870 shlink
= symtab_hdr
->sh_link
;
6871 name
= (bfd_elf_string_from_elf_section
6872 (input_bfd
, shlink
, sym
.st_name
));
6876 osec
= sec
->output_section
;
6878 _bfd_elf_section_from_bfd_section (output_bfd
,
6880 if (sym
.st_shndx
== SHN_BAD
)
6883 sym
.st_value
+= sec
->output_offset
;
6884 if (! finfo
->info
->relocatable
)
6886 sym
.st_value
+= osec
->vma
;
6887 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
6889 /* STT_TLS symbols are relative to PT_TLS
6891 BFD_ASSERT (elf_hash_table (finfo
->info
)
6893 sym
.st_value
-= (elf_hash_table (finfo
->info
)
6898 finfo
->indices
[r_symndx
]
6899 = bfd_get_symcount (output_bfd
);
6901 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
,
6906 r_symndx
= finfo
->indices
[r_symndx
];
6909 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
6910 | (irela
->r_info
& r_type_mask
));
6913 /* Swap out the relocs. */
6914 if (bed
->elf_backend_emit_relocs
6915 && !(finfo
->info
->relocatable
6916 || finfo
->info
->emitrelocations
))
6917 reloc_emitter
= bed
->elf_backend_emit_relocs
;
6919 reloc_emitter
= _bfd_elf_link_output_relocs
;
6921 if (input_rel_hdr
->sh_size
!= 0
6922 && ! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
6926 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
6927 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
6929 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
6930 * bed
->s
->int_rels_per_ext_rel
);
6931 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr2
,
6938 /* Write out the modified section contents. */
6939 if (bed
->elf_backend_write_section
6940 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
6942 /* Section written out. */
6944 else switch (o
->sec_info_type
)
6946 case ELF_INFO_TYPE_STABS
:
6947 if (! (_bfd_write_section_stabs
6949 &elf_hash_table (finfo
->info
)->stab_info
,
6950 o
, &elf_section_data (o
)->sec_info
, contents
)))
6953 case ELF_INFO_TYPE_MERGE
:
6954 if (! _bfd_write_merged_section (output_bfd
, o
,
6955 elf_section_data (o
)->sec_info
))
6958 case ELF_INFO_TYPE_EH_FRAME
:
6960 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
6967 if (! (o
->flags
& SEC_EXCLUDE
)
6968 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
6970 (file_ptr
) o
->output_offset
,
6981 /* Generate a reloc when linking an ELF file. This is a reloc
6982 requested by the linker, and does come from any input file. This
6983 is used to build constructor and destructor tables when linking
6987 elf_reloc_link_order (bfd
*output_bfd
,
6988 struct bfd_link_info
*info
,
6989 asection
*output_section
,
6990 struct bfd_link_order
*link_order
)
6992 reloc_howto_type
*howto
;
6996 struct elf_link_hash_entry
**rel_hash_ptr
;
6997 Elf_Internal_Shdr
*rel_hdr
;
6998 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
6999 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
7003 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
7006 bfd_set_error (bfd_error_bad_value
);
7010 addend
= link_order
->u
.reloc
.p
->addend
;
7012 /* Figure out the symbol index. */
7013 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
7014 + elf_section_data (output_section
)->rel_count
7015 + elf_section_data (output_section
)->rel_count2
);
7016 if (link_order
->type
== bfd_section_reloc_link_order
)
7018 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
7019 BFD_ASSERT (indx
!= 0);
7020 *rel_hash_ptr
= NULL
;
7024 struct elf_link_hash_entry
*h
;
7026 /* Treat a reloc against a defined symbol as though it were
7027 actually against the section. */
7028 h
= ((struct elf_link_hash_entry
*)
7029 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7030 link_order
->u
.reloc
.p
->u
.name
,
7031 FALSE
, FALSE
, TRUE
));
7033 && (h
->root
.type
== bfd_link_hash_defined
7034 || h
->root
.type
== bfd_link_hash_defweak
))
7038 section
= h
->root
.u
.def
.section
;
7039 indx
= section
->output_section
->target_index
;
7040 *rel_hash_ptr
= NULL
;
7041 /* It seems that we ought to add the symbol value to the
7042 addend here, but in practice it has already been added
7043 because it was passed to constructor_callback. */
7044 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7048 /* Setting the index to -2 tells elf_link_output_extsym that
7049 this symbol is used by a reloc. */
7056 if (! ((*info
->callbacks
->unattached_reloc
)
7057 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
7063 /* If this is an inplace reloc, we must write the addend into the
7065 if (howto
->partial_inplace
&& addend
!= 0)
7068 bfd_reloc_status_type rstat
;
7071 const char *sym_name
;
7073 size
= bfd_get_reloc_size (howto
);
7074 buf
= bfd_zmalloc (size
);
7077 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
7084 case bfd_reloc_outofrange
:
7087 case bfd_reloc_overflow
:
7088 if (link_order
->type
== bfd_section_reloc_link_order
)
7089 sym_name
= bfd_section_name (output_bfd
,
7090 link_order
->u
.reloc
.p
->u
.section
);
7092 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7093 if (! ((*info
->callbacks
->reloc_overflow
)
7094 (info
, sym_name
, howto
->name
, addend
, NULL
, NULL
, 0)))
7101 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
7102 link_order
->offset
, size
);
7108 /* The address of a reloc is relative to the section in a
7109 relocatable file, and is a virtual address in an executable
7111 offset
= link_order
->offset
;
7112 if (! info
->relocatable
)
7113 offset
+= output_section
->vma
;
7115 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7117 irel
[i
].r_offset
= offset
;
7119 irel
[i
].r_addend
= 0;
7121 if (bed
->s
->arch_size
== 32)
7122 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
7124 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
7126 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7127 erel
= rel_hdr
->contents
;
7128 if (rel_hdr
->sh_type
== SHT_REL
)
7130 erel
+= (elf_section_data (output_section
)->rel_count
7131 * bed
->s
->sizeof_rel
);
7132 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
7136 irel
[0].r_addend
= addend
;
7137 erel
+= (elf_section_data (output_section
)->rel_count
7138 * bed
->s
->sizeof_rela
);
7139 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
7142 ++elf_section_data (output_section
)->rel_count
;
7147 /* Do the final step of an ELF link. */
7150 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
7152 bfd_boolean dynamic
;
7153 bfd_boolean emit_relocs
;
7155 struct elf_final_link_info finfo
;
7156 register asection
*o
;
7157 register struct bfd_link_order
*p
;
7159 bfd_size_type max_contents_size
;
7160 bfd_size_type max_external_reloc_size
;
7161 bfd_size_type max_internal_reloc_count
;
7162 bfd_size_type max_sym_count
;
7163 bfd_size_type max_sym_shndx_count
;
7165 Elf_Internal_Sym elfsym
;
7167 Elf_Internal_Shdr
*symtab_hdr
;
7168 Elf_Internal_Shdr
*symtab_shndx_hdr
;
7169 Elf_Internal_Shdr
*symstrtab_hdr
;
7170 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7171 struct elf_outext_info eoinfo
;
7173 size_t relativecount
= 0;
7174 asection
*reldyn
= 0;
7177 if (! is_elf_hash_table (info
->hash
))
7181 abfd
->flags
|= DYNAMIC
;
7183 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
7184 dynobj
= elf_hash_table (info
)->dynobj
;
7186 emit_relocs
= (info
->relocatable
7187 || info
->emitrelocations
7188 || bed
->elf_backend_emit_relocs
);
7191 finfo
.output_bfd
= abfd
;
7192 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
7193 if (finfo
.symstrtab
== NULL
)
7198 finfo
.dynsym_sec
= NULL
;
7199 finfo
.hash_sec
= NULL
;
7200 finfo
.symver_sec
= NULL
;
7204 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
7205 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
7206 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
7207 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
7208 /* Note that it is OK if symver_sec is NULL. */
7211 finfo
.contents
= NULL
;
7212 finfo
.external_relocs
= NULL
;
7213 finfo
.internal_relocs
= NULL
;
7214 finfo
.external_syms
= NULL
;
7215 finfo
.locsym_shndx
= NULL
;
7216 finfo
.internal_syms
= NULL
;
7217 finfo
.indices
= NULL
;
7218 finfo
.sections
= NULL
;
7219 finfo
.symbuf
= NULL
;
7220 finfo
.symshndxbuf
= NULL
;
7221 finfo
.symbuf_count
= 0;
7222 finfo
.shndxbuf_size
= 0;
7224 /* Count up the number of relocations we will output for each output
7225 section, so that we know the sizes of the reloc sections. We
7226 also figure out some maximum sizes. */
7227 max_contents_size
= 0;
7228 max_external_reloc_size
= 0;
7229 max_internal_reloc_count
= 0;
7231 max_sym_shndx_count
= 0;
7233 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7235 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
7238 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7240 unsigned int reloc_count
= 0;
7241 struct bfd_elf_section_data
*esdi
= NULL
;
7242 unsigned int *rel_count1
;
7244 if (p
->type
== bfd_section_reloc_link_order
7245 || p
->type
== bfd_symbol_reloc_link_order
)
7247 else if (p
->type
== bfd_indirect_link_order
)
7251 sec
= p
->u
.indirect
.section
;
7252 esdi
= elf_section_data (sec
);
7254 /* Mark all sections which are to be included in the
7255 link. This will normally be every section. We need
7256 to do this so that we can identify any sections which
7257 the linker has decided to not include. */
7258 sec
->linker_mark
= TRUE
;
7260 if (sec
->flags
& SEC_MERGE
)
7263 if (info
->relocatable
|| info
->emitrelocations
)
7264 reloc_count
= sec
->reloc_count
;
7265 else if (bed
->elf_backend_count_relocs
)
7267 Elf_Internal_Rela
* relocs
;
7269 relocs
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
7272 reloc_count
= (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
7274 if (elf_section_data (o
)->relocs
!= relocs
)
7278 if (sec
->rawsize
> max_contents_size
)
7279 max_contents_size
= sec
->rawsize
;
7280 if (sec
->size
> max_contents_size
)
7281 max_contents_size
= sec
->size
;
7283 /* We are interested in just local symbols, not all
7285 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
7286 && (sec
->owner
->flags
& DYNAMIC
) == 0)
7290 if (elf_bad_symtab (sec
->owner
))
7291 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
7292 / bed
->s
->sizeof_sym
);
7294 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
7296 if (sym_count
> max_sym_count
)
7297 max_sym_count
= sym_count
;
7299 if (sym_count
> max_sym_shndx_count
7300 && elf_symtab_shndx (sec
->owner
) != 0)
7301 max_sym_shndx_count
= sym_count
;
7303 if ((sec
->flags
& SEC_RELOC
) != 0)
7307 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
7308 if (ext_size
> max_external_reloc_size
)
7309 max_external_reloc_size
= ext_size
;
7310 if (sec
->reloc_count
> max_internal_reloc_count
)
7311 max_internal_reloc_count
= sec
->reloc_count
;
7316 if (reloc_count
== 0)
7319 o
->reloc_count
+= reloc_count
;
7321 /* MIPS may have a mix of REL and RELA relocs on sections.
7322 To support this curious ABI we keep reloc counts in
7323 elf_section_data too. We must be careful to add the
7324 relocations from the input section to the right output
7325 count. FIXME: Get rid of one count. We have
7326 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
7327 rel_count1
= &esdo
->rel_count
;
7330 bfd_boolean same_size
;
7331 bfd_size_type entsize1
;
7333 entsize1
= esdi
->rel_hdr
.sh_entsize
;
7334 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
7335 || entsize1
== bed
->s
->sizeof_rela
);
7336 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
7339 rel_count1
= &esdo
->rel_count2
;
7341 if (esdi
->rel_hdr2
!= NULL
)
7343 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
7344 unsigned int alt_count
;
7345 unsigned int *rel_count2
;
7347 BFD_ASSERT (entsize2
!= entsize1
7348 && (entsize2
== bed
->s
->sizeof_rel
7349 || entsize2
== bed
->s
->sizeof_rela
));
7351 rel_count2
= &esdo
->rel_count2
;
7353 rel_count2
= &esdo
->rel_count
;
7355 /* The following is probably too simplistic if the
7356 backend counts output relocs unusually. */
7357 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
7358 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
7359 *rel_count2
+= alt_count
;
7360 reloc_count
-= alt_count
;
7363 *rel_count1
+= reloc_count
;
7366 if (o
->reloc_count
> 0)
7367 o
->flags
|= SEC_RELOC
;
7370 /* Explicitly clear the SEC_RELOC flag. The linker tends to
7371 set it (this is probably a bug) and if it is set
7372 assign_section_numbers will create a reloc section. */
7373 o
->flags
&=~ SEC_RELOC
;
7376 /* If the SEC_ALLOC flag is not set, force the section VMA to
7377 zero. This is done in elf_fake_sections as well, but forcing
7378 the VMA to 0 here will ensure that relocs against these
7379 sections are handled correctly. */
7380 if ((o
->flags
& SEC_ALLOC
) == 0
7381 && ! o
->user_set_vma
)
7385 if (! info
->relocatable
&& merged
)
7386 elf_link_hash_traverse (elf_hash_table (info
),
7387 _bfd_elf_link_sec_merge_syms
, abfd
);
7389 /* Figure out the file positions for everything but the symbol table
7390 and the relocs. We set symcount to force assign_section_numbers
7391 to create a symbol table. */
7392 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
7393 BFD_ASSERT (! abfd
->output_has_begun
);
7394 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
7397 /* That created the reloc sections. Set their sizes, and assign
7398 them file positions, and allocate some buffers. */
7399 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7401 if ((o
->flags
& SEC_RELOC
) != 0)
7403 if (!(_bfd_elf_link_size_reloc_section
7404 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
7407 if (elf_section_data (o
)->rel_hdr2
7408 && !(_bfd_elf_link_size_reloc_section
7409 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
7413 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
7414 to count upwards while actually outputting the relocations. */
7415 elf_section_data (o
)->rel_count
= 0;
7416 elf_section_data (o
)->rel_count2
= 0;
7419 _bfd_elf_assign_file_positions_for_relocs (abfd
);
7421 /* We have now assigned file positions for all the sections except
7422 .symtab and .strtab. We start the .symtab section at the current
7423 file position, and write directly to it. We build the .strtab
7424 section in memory. */
7425 bfd_get_symcount (abfd
) = 0;
7426 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
7427 /* sh_name is set in prep_headers. */
7428 symtab_hdr
->sh_type
= SHT_SYMTAB
;
7429 /* sh_flags, sh_addr and sh_size all start off zero. */
7430 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
7431 /* sh_link is set in assign_section_numbers. */
7432 /* sh_info is set below. */
7433 /* sh_offset is set just below. */
7434 symtab_hdr
->sh_addralign
= 1 << bed
->s
->log_file_align
;
7436 off
= elf_tdata (abfd
)->next_file_pos
;
7437 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
7439 /* Note that at this point elf_tdata (abfd)->next_file_pos is
7440 incorrect. We do not yet know the size of the .symtab section.
7441 We correct next_file_pos below, after we do know the size. */
7443 /* Allocate a buffer to hold swapped out symbols. This is to avoid
7444 continuously seeking to the right position in the file. */
7445 if (! info
->keep_memory
|| max_sym_count
< 20)
7446 finfo
.symbuf_size
= 20;
7448 finfo
.symbuf_size
= max_sym_count
;
7449 amt
= finfo
.symbuf_size
;
7450 amt
*= bed
->s
->sizeof_sym
;
7451 finfo
.symbuf
= bfd_malloc (amt
);
7452 if (finfo
.symbuf
== NULL
)
7454 if (elf_numsections (abfd
) > SHN_LORESERVE
)
7456 /* Wild guess at number of output symbols. realloc'd as needed. */
7457 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
7458 finfo
.shndxbuf_size
= amt
;
7459 amt
*= sizeof (Elf_External_Sym_Shndx
);
7460 finfo
.symshndxbuf
= bfd_zmalloc (amt
);
7461 if (finfo
.symshndxbuf
== NULL
)
7465 /* Start writing out the symbol table. The first symbol is always a
7467 if (info
->strip
!= strip_all
7470 elfsym
.st_value
= 0;
7473 elfsym
.st_other
= 0;
7474 elfsym
.st_shndx
= SHN_UNDEF
;
7475 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
7481 /* Some standard ELF linkers do this, but we don't because it causes
7482 bootstrap comparison failures. */
7483 /* Output a file symbol for the output file as the second symbol.
7484 We output this even if we are discarding local symbols, although
7485 I'm not sure if this is correct. */
7486 elfsym
.st_value
= 0;
7488 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
7489 elfsym
.st_other
= 0;
7490 elfsym
.st_shndx
= SHN_ABS
;
7491 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
7492 &elfsym
, bfd_abs_section_ptr
, NULL
))
7496 /* Output a symbol for each section. We output these even if we are
7497 discarding local symbols, since they are used for relocs. These
7498 symbols have no names. We store the index of each one in the
7499 index field of the section, so that we can find it again when
7500 outputting relocs. */
7501 if (info
->strip
!= strip_all
7505 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7506 elfsym
.st_other
= 0;
7507 for (i
= 1; i
< elf_numsections (abfd
); i
++)
7509 o
= bfd_section_from_elf_index (abfd
, i
);
7511 o
->target_index
= bfd_get_symcount (abfd
);
7512 elfsym
.st_shndx
= i
;
7513 if (info
->relocatable
|| o
== NULL
)
7514 elfsym
.st_value
= 0;
7516 elfsym
.st_value
= o
->vma
;
7517 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
))
7519 if (i
== SHN_LORESERVE
- 1)
7520 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
7524 /* Allocate some memory to hold information read in from the input
7526 if (max_contents_size
!= 0)
7528 finfo
.contents
= bfd_malloc (max_contents_size
);
7529 if (finfo
.contents
== NULL
)
7533 if (max_external_reloc_size
!= 0)
7535 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
7536 if (finfo
.external_relocs
== NULL
)
7540 if (max_internal_reloc_count
!= 0)
7542 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7543 amt
*= sizeof (Elf_Internal_Rela
);
7544 finfo
.internal_relocs
= bfd_malloc (amt
);
7545 if (finfo
.internal_relocs
== NULL
)
7549 if (max_sym_count
!= 0)
7551 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
7552 finfo
.external_syms
= bfd_malloc (amt
);
7553 if (finfo
.external_syms
== NULL
)
7556 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
7557 finfo
.internal_syms
= bfd_malloc (amt
);
7558 if (finfo
.internal_syms
== NULL
)
7561 amt
= max_sym_count
* sizeof (long);
7562 finfo
.indices
= bfd_malloc (amt
);
7563 if (finfo
.indices
== NULL
)
7566 amt
= max_sym_count
* sizeof (asection
*);
7567 finfo
.sections
= bfd_malloc (amt
);
7568 if (finfo
.sections
== NULL
)
7572 if (max_sym_shndx_count
!= 0)
7574 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
7575 finfo
.locsym_shndx
= bfd_malloc (amt
);
7576 if (finfo
.locsym_shndx
== NULL
)
7580 if (elf_hash_table (info
)->tls_sec
)
7582 bfd_vma base
, end
= 0;
7585 for (sec
= elf_hash_table (info
)->tls_sec
;
7586 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
7589 bfd_vma size
= sec
->size
;
7591 if (size
== 0 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
7593 struct bfd_link_order
*o
;
7595 for (o
= sec
->link_order_head
; o
!= NULL
; o
= o
->next
)
7596 if (size
< o
->offset
+ o
->size
)
7597 size
= o
->offset
+ o
->size
;
7599 end
= sec
->vma
+ size
;
7601 base
= elf_hash_table (info
)->tls_sec
->vma
;
7602 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
7603 elf_hash_table (info
)->tls_size
= end
- base
;
7606 /* Since ELF permits relocations to be against local symbols, we
7607 must have the local symbols available when we do the relocations.
7608 Since we would rather only read the local symbols once, and we
7609 would rather not keep them in memory, we handle all the
7610 relocations for a single input file at the same time.
7612 Unfortunately, there is no way to know the total number of local
7613 symbols until we have seen all of them, and the local symbol
7614 indices precede the global symbol indices. This means that when
7615 we are generating relocatable output, and we see a reloc against
7616 a global symbol, we can not know the symbol index until we have
7617 finished examining all the local symbols to see which ones we are
7618 going to output. To deal with this, we keep the relocations in
7619 memory, and don't output them until the end of the link. This is
7620 an unfortunate waste of memory, but I don't see a good way around
7621 it. Fortunately, it only happens when performing a relocatable
7622 link, which is not the common case. FIXME: If keep_memory is set
7623 we could write the relocs out and then read them again; I don't
7624 know how bad the memory loss will be. */
7626 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7627 sub
->output_has_begun
= FALSE
;
7628 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7630 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7632 if (p
->type
== bfd_indirect_link_order
7633 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
7634 == bfd_target_elf_flavour
)
7635 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
7637 if (! sub
->output_has_begun
)
7639 if (! elf_link_input_bfd (&finfo
, sub
))
7641 sub
->output_has_begun
= TRUE
;
7644 else if (p
->type
== bfd_section_reloc_link_order
7645 || p
->type
== bfd_symbol_reloc_link_order
)
7647 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
7652 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
7658 /* Output any global symbols that got converted to local in a
7659 version script or due to symbol visibility. We do this in a
7660 separate step since ELF requires all local symbols to appear
7661 prior to any global symbols. FIXME: We should only do this if
7662 some global symbols were, in fact, converted to become local.
7663 FIXME: Will this work correctly with the Irix 5 linker? */
7664 eoinfo
.failed
= FALSE
;
7665 eoinfo
.finfo
= &finfo
;
7666 eoinfo
.localsyms
= TRUE
;
7667 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
7672 /* That wrote out all the local symbols. Finish up the symbol table
7673 with the global symbols. Even if we want to strip everything we
7674 can, we still need to deal with those global symbols that got
7675 converted to local in a version script. */
7677 /* The sh_info field records the index of the first non local symbol. */
7678 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
7681 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
7683 Elf_Internal_Sym sym
;
7684 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
7685 long last_local
= 0;
7687 /* Write out the section symbols for the output sections. */
7694 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7697 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
7703 dynindx
= elf_section_data (s
)->dynindx
;
7706 indx
= elf_section_data (s
)->this_idx
;
7707 BFD_ASSERT (indx
> 0);
7708 sym
.st_shndx
= indx
;
7709 sym
.st_value
= s
->vma
;
7710 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
7711 if (last_local
< dynindx
)
7712 last_local
= dynindx
;
7713 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
7717 /* Write out the local dynsyms. */
7718 if (elf_hash_table (info
)->dynlocal
)
7720 struct elf_link_local_dynamic_entry
*e
;
7721 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
7726 sym
.st_size
= e
->isym
.st_size
;
7727 sym
.st_other
= e
->isym
.st_other
;
7729 /* Copy the internal symbol as is.
7730 Note that we saved a word of storage and overwrote
7731 the original st_name with the dynstr_index. */
7734 if (e
->isym
.st_shndx
!= SHN_UNDEF
7735 && (e
->isym
.st_shndx
< SHN_LORESERVE
7736 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
7738 s
= bfd_section_from_elf_index (e
->input_bfd
,
7742 elf_section_data (s
->output_section
)->this_idx
;
7743 sym
.st_value
= (s
->output_section
->vma
7745 + e
->isym
.st_value
);
7748 if (last_local
< e
->dynindx
)
7749 last_local
= e
->dynindx
;
7751 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
7752 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
7756 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
7760 /* We get the global symbols from the hash table. */
7761 eoinfo
.failed
= FALSE
;
7762 eoinfo
.localsyms
= FALSE
;
7763 eoinfo
.finfo
= &finfo
;
7764 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
7769 /* If backend needs to output some symbols not present in the hash
7770 table, do it now. */
7771 if (bed
->elf_backend_output_arch_syms
)
7773 typedef bfd_boolean (*out_sym_func
)
7774 (void *, const char *, Elf_Internal_Sym
*, asection
*,
7775 struct elf_link_hash_entry
*);
7777 if (! ((*bed
->elf_backend_output_arch_syms
)
7778 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
7782 /* Flush all symbols to the file. */
7783 if (! elf_link_flush_output_syms (&finfo
, bed
))
7786 /* Now we know the size of the symtab section. */
7787 off
+= symtab_hdr
->sh_size
;
7789 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
7790 if (symtab_shndx_hdr
->sh_name
!= 0)
7792 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
7793 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
7794 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
7795 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
7796 symtab_shndx_hdr
->sh_size
= amt
;
7798 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
7801 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
7802 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
7807 /* Finish up and write out the symbol string table (.strtab)
7809 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
7810 /* sh_name was set in prep_headers. */
7811 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
7812 symstrtab_hdr
->sh_flags
= 0;
7813 symstrtab_hdr
->sh_addr
= 0;
7814 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
7815 symstrtab_hdr
->sh_entsize
= 0;
7816 symstrtab_hdr
->sh_link
= 0;
7817 symstrtab_hdr
->sh_info
= 0;
7818 /* sh_offset is set just below. */
7819 symstrtab_hdr
->sh_addralign
= 1;
7821 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
7822 elf_tdata (abfd
)->next_file_pos
= off
;
7824 if (bfd_get_symcount (abfd
) > 0)
7826 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
7827 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
7831 /* Adjust the relocs to have the correct symbol indices. */
7832 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7834 if ((o
->flags
& SEC_RELOC
) == 0)
7837 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
7838 elf_section_data (o
)->rel_count
,
7839 elf_section_data (o
)->rel_hashes
);
7840 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
7841 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
7842 elf_section_data (o
)->rel_count2
,
7843 (elf_section_data (o
)->rel_hashes
7844 + elf_section_data (o
)->rel_count
));
7846 /* Set the reloc_count field to 0 to prevent write_relocs from
7847 trying to swap the relocs out itself. */
7851 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
7852 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
7854 /* If we are linking against a dynamic object, or generating a
7855 shared library, finish up the dynamic linking information. */
7858 bfd_byte
*dyncon
, *dynconend
;
7860 /* Fix up .dynamic entries. */
7861 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
7862 BFD_ASSERT (o
!= NULL
);
7864 dyncon
= o
->contents
;
7865 dynconend
= o
->contents
+ o
->size
;
7866 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
7868 Elf_Internal_Dyn dyn
;
7872 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
7879 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
7881 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
7883 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
7884 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
7887 dyn
.d_un
.d_val
= relativecount
;
7894 name
= info
->init_function
;
7897 name
= info
->fini_function
;
7900 struct elf_link_hash_entry
*h
;
7902 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
7903 FALSE
, FALSE
, TRUE
);
7905 && (h
->root
.type
== bfd_link_hash_defined
7906 || h
->root
.type
== bfd_link_hash_defweak
))
7908 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
7909 o
= h
->root
.u
.def
.section
;
7910 if (o
->output_section
!= NULL
)
7911 dyn
.d_un
.d_val
+= (o
->output_section
->vma
7912 + o
->output_offset
);
7915 /* The symbol is imported from another shared
7916 library and does not apply to this one. */
7924 case DT_PREINIT_ARRAYSZ
:
7925 name
= ".preinit_array";
7927 case DT_INIT_ARRAYSZ
:
7928 name
= ".init_array";
7930 case DT_FINI_ARRAYSZ
:
7931 name
= ".fini_array";
7933 o
= bfd_get_section_by_name (abfd
, name
);
7936 (*_bfd_error_handler
)
7937 (_("%s: could not find output section %s"),
7938 bfd_get_filename (abfd
), name
);
7942 (*_bfd_error_handler
)
7943 (_("warning: %s section has zero size"), name
);
7944 dyn
.d_un
.d_val
= o
->size
;
7947 case DT_PREINIT_ARRAY
:
7948 name
= ".preinit_array";
7951 name
= ".init_array";
7954 name
= ".fini_array";
7967 name
= ".gnu.version_d";
7970 name
= ".gnu.version_r";
7973 name
= ".gnu.version";
7975 o
= bfd_get_section_by_name (abfd
, name
);
7978 (*_bfd_error_handler
)
7979 (_("%s: could not find output section %s"),
7980 bfd_get_filename (abfd
), name
);
7983 dyn
.d_un
.d_ptr
= o
->vma
;
7990 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
7995 for (i
= 1; i
< elf_numsections (abfd
); i
++)
7997 Elf_Internal_Shdr
*hdr
;
7999 hdr
= elf_elfsections (abfd
)[i
];
8000 if (hdr
->sh_type
== type
8001 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
8003 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
8004 dyn
.d_un
.d_val
+= hdr
->sh_size
;
8007 if (dyn
.d_un
.d_val
== 0
8008 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
8009 dyn
.d_un
.d_val
= hdr
->sh_addr
;
8015 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
8019 /* If we have created any dynamic sections, then output them. */
8022 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
8025 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
8027 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
8029 || o
->output_section
== bfd_abs_section_ptr
)
8031 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
8033 /* At this point, we are only interested in sections
8034 created by _bfd_elf_link_create_dynamic_sections. */
8037 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
8039 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
8041 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
8043 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
8045 if (! bfd_set_section_contents (abfd
, o
->output_section
,
8047 (file_ptr
) o
->output_offset
,
8053 /* The contents of the .dynstr section are actually in a
8055 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
8056 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
8057 || ! _bfd_elf_strtab_emit (abfd
,
8058 elf_hash_table (info
)->dynstr
))
8064 if (info
->relocatable
)
8066 bfd_boolean failed
= FALSE
;
8068 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
8073 /* If we have optimized stabs strings, output them. */
8074 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
8076 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
8080 if (info
->eh_frame_hdr
)
8082 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
8086 if (finfo
.symstrtab
!= NULL
)
8087 _bfd_stringtab_free (finfo
.symstrtab
);
8088 if (finfo
.contents
!= NULL
)
8089 free (finfo
.contents
);
8090 if (finfo
.external_relocs
!= NULL
)
8091 free (finfo
.external_relocs
);
8092 if (finfo
.internal_relocs
!= NULL
)
8093 free (finfo
.internal_relocs
);
8094 if (finfo
.external_syms
!= NULL
)
8095 free (finfo
.external_syms
);
8096 if (finfo
.locsym_shndx
!= NULL
)
8097 free (finfo
.locsym_shndx
);
8098 if (finfo
.internal_syms
!= NULL
)
8099 free (finfo
.internal_syms
);
8100 if (finfo
.indices
!= NULL
)
8101 free (finfo
.indices
);
8102 if (finfo
.sections
!= NULL
)
8103 free (finfo
.sections
);
8104 if (finfo
.symbuf
!= NULL
)
8105 free (finfo
.symbuf
);
8106 if (finfo
.symshndxbuf
!= NULL
)
8107 free (finfo
.symshndxbuf
);
8108 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8110 if ((o
->flags
& SEC_RELOC
) != 0
8111 && elf_section_data (o
)->rel_hashes
!= NULL
)
8112 free (elf_section_data (o
)->rel_hashes
);
8115 elf_tdata (abfd
)->linker
= TRUE
;
8120 if (finfo
.symstrtab
!= NULL
)
8121 _bfd_stringtab_free (finfo
.symstrtab
);
8122 if (finfo
.contents
!= NULL
)
8123 free (finfo
.contents
);
8124 if (finfo
.external_relocs
!= NULL
)
8125 free (finfo
.external_relocs
);
8126 if (finfo
.internal_relocs
!= NULL
)
8127 free (finfo
.internal_relocs
);
8128 if (finfo
.external_syms
!= NULL
)
8129 free (finfo
.external_syms
);
8130 if (finfo
.locsym_shndx
!= NULL
)
8131 free (finfo
.locsym_shndx
);
8132 if (finfo
.internal_syms
!= NULL
)
8133 free (finfo
.internal_syms
);
8134 if (finfo
.indices
!= NULL
)
8135 free (finfo
.indices
);
8136 if (finfo
.sections
!= NULL
)
8137 free (finfo
.sections
);
8138 if (finfo
.symbuf
!= NULL
)
8139 free (finfo
.symbuf
);
8140 if (finfo
.symshndxbuf
!= NULL
)
8141 free (finfo
.symshndxbuf
);
8142 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8144 if ((o
->flags
& SEC_RELOC
) != 0
8145 && elf_section_data (o
)->rel_hashes
!= NULL
)
8146 free (elf_section_data (o
)->rel_hashes
);
8152 /* Garbage collect unused sections. */
8154 /* The mark phase of garbage collection. For a given section, mark
8155 it and any sections in this section's group, and all the sections
8156 which define symbols to which it refers. */
8158 typedef asection
* (*gc_mark_hook_fn
)
8159 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8160 struct elf_link_hash_entry
*, Elf_Internal_Sym
*);
8163 elf_gc_mark (struct bfd_link_info
*info
,
8165 gc_mark_hook_fn gc_mark_hook
)
8168 asection
*group_sec
;
8172 /* Mark all the sections in the group. */
8173 group_sec
= elf_section_data (sec
)->next_in_group
;
8174 if (group_sec
&& !group_sec
->gc_mark
)
8175 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
8178 /* Look through the section relocs. */
8180 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
8182 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
8183 Elf_Internal_Shdr
*symtab_hdr
;
8184 struct elf_link_hash_entry
**sym_hashes
;
8187 bfd
*input_bfd
= sec
->owner
;
8188 const struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
8189 Elf_Internal_Sym
*isym
= NULL
;
8192 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
8193 sym_hashes
= elf_sym_hashes (input_bfd
);
8195 /* Read the local symbols. */
8196 if (elf_bad_symtab (input_bfd
))
8198 nlocsyms
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8202 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
8204 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8205 if (isym
== NULL
&& nlocsyms
!= 0)
8207 isym
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, nlocsyms
, 0,
8213 /* Read the relocations. */
8214 relstart
= _bfd_elf_link_read_relocs (input_bfd
, sec
, NULL
, NULL
,
8216 if (relstart
== NULL
)
8221 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8223 if (bed
->s
->arch_size
== 32)
8228 for (rel
= relstart
; rel
< relend
; rel
++)
8230 unsigned long r_symndx
;
8232 struct elf_link_hash_entry
*h
;
8234 r_symndx
= rel
->r_info
>> r_sym_shift
;
8238 if (r_symndx
>= nlocsyms
8239 || ELF_ST_BIND (isym
[r_symndx
].st_info
) != STB_LOCAL
)
8241 h
= sym_hashes
[r_symndx
- extsymoff
];
8242 while (h
->root
.type
== bfd_link_hash_indirect
8243 || h
->root
.type
== bfd_link_hash_warning
)
8244 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8245 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, h
, NULL
);
8249 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, NULL
, &isym
[r_symndx
]);
8252 if (rsec
&& !rsec
->gc_mark
)
8254 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
8256 else if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
8265 if (elf_section_data (sec
)->relocs
!= relstart
)
8268 if (isym
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isym
)
8270 if (! info
->keep_memory
)
8273 symtab_hdr
->contents
= (unsigned char *) isym
;
8280 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
8283 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *idxptr
)
8287 if (h
->root
.type
== bfd_link_hash_warning
)
8288 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8290 if (h
->dynindx
!= -1
8291 && ((h
->root
.type
!= bfd_link_hash_defined
8292 && h
->root
.type
!= bfd_link_hash_defweak
)
8293 || h
->root
.u
.def
.section
->gc_mark
))
8294 h
->dynindx
= (*idx
)++;
8299 /* The sweep phase of garbage collection. Remove all garbage sections. */
8301 typedef bfd_boolean (*gc_sweep_hook_fn
)
8302 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
8305 elf_gc_sweep (struct bfd_link_info
*info
, gc_sweep_hook_fn gc_sweep_hook
)
8309 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8313 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8316 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8318 /* Keep special sections. Keep .debug sections. */
8319 if ((o
->flags
& SEC_LINKER_CREATED
)
8320 || (o
->flags
& SEC_DEBUGGING
))
8326 /* Skip sweeping sections already excluded. */
8327 if (o
->flags
& SEC_EXCLUDE
)
8330 /* Since this is early in the link process, it is simple
8331 to remove a section from the output. */
8332 o
->flags
|= SEC_EXCLUDE
;
8334 /* But we also have to update some of the relocation
8335 info we collected before. */
8337 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
8339 Elf_Internal_Rela
*internal_relocs
;
8343 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
8345 if (internal_relocs
== NULL
)
8348 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
8350 if (elf_section_data (o
)->relocs
!= internal_relocs
)
8351 free (internal_relocs
);
8359 /* Remove the symbols that were in the swept sections from the dynamic
8360 symbol table. GCFIXME: Anyone know how to get them out of the
8361 static symbol table as well? */
8365 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
, &i
);
8367 elf_hash_table (info
)->dynsymcount
= i
;
8373 /* Propagate collected vtable information. This is called through
8374 elf_link_hash_traverse. */
8377 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
8379 if (h
->root
.type
== bfd_link_hash_warning
)
8380 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8382 /* Those that are not vtables. */
8383 if (h
->vtable_parent
== NULL
)
8386 /* Those vtables that do not have parents, we cannot merge. */
8387 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
8390 /* If we've already been done, exit. */
8391 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
8394 /* Make sure the parent's table is up to date. */
8395 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
8397 if (h
->vtable_entries_used
== NULL
)
8399 /* None of this table's entries were referenced. Re-use the
8401 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
8402 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
8407 bfd_boolean
*cu
, *pu
;
8409 /* Or the parent's entries into ours. */
8410 cu
= h
->vtable_entries_used
;
8412 pu
= h
->vtable_parent
->vtable_entries_used
;
8415 const struct elf_backend_data
*bed
;
8416 unsigned int log_file_align
;
8418 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
8419 log_file_align
= bed
->s
->log_file_align
;
8420 n
= h
->vtable_parent
->vtable_entries_size
>> log_file_align
;
8435 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
8438 bfd_vma hstart
, hend
;
8439 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
8440 const struct elf_backend_data
*bed
;
8441 unsigned int log_file_align
;
8443 if (h
->root
.type
== bfd_link_hash_warning
)
8444 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8446 /* Take care of both those symbols that do not describe vtables as
8447 well as those that are not loaded. */
8448 if (h
->vtable_parent
== NULL
)
8451 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
8452 || h
->root
.type
== bfd_link_hash_defweak
);
8454 sec
= h
->root
.u
.def
.section
;
8455 hstart
= h
->root
.u
.def
.value
;
8456 hend
= hstart
+ h
->size
;
8458 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
8460 return *(bfd_boolean
*) okp
= FALSE
;
8461 bed
= get_elf_backend_data (sec
->owner
);
8462 log_file_align
= bed
->s
->log_file_align
;
8464 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8466 for (rel
= relstart
; rel
< relend
; ++rel
)
8467 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
8469 /* If the entry is in use, do nothing. */
8470 if (h
->vtable_entries_used
8471 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
8473 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
8474 if (h
->vtable_entries_used
[entry
])
8477 /* Otherwise, kill it. */
8478 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
8484 /* Mark sections containing dynamically referenced symbols. This is called
8485 through elf_link_hash_traverse. */
8488 elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
,
8489 void *okp ATTRIBUTE_UNUSED
)
8491 if (h
->root
.type
== bfd_link_hash_warning
)
8492 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8494 if ((h
->root
.type
== bfd_link_hash_defined
8495 || h
->root
.type
== bfd_link_hash_defweak
)
8496 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
))
8497 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
8502 /* Do mark and sweep of unused sections. */
8505 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
8507 bfd_boolean ok
= TRUE
;
8509 asection
* (*gc_mark_hook
)
8510 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8511 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*);
8513 if (!get_elf_backend_data (abfd
)->can_gc_sections
8514 || info
->relocatable
8515 || info
->emitrelocations
8517 || !is_elf_hash_table (info
->hash
))
8519 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
8523 /* Apply transitive closure to the vtable entry usage info. */
8524 elf_link_hash_traverse (elf_hash_table (info
),
8525 elf_gc_propagate_vtable_entries_used
,
8530 /* Kill the vtable relocations that were not used. */
8531 elf_link_hash_traverse (elf_hash_table (info
),
8532 elf_gc_smash_unused_vtentry_relocs
,
8537 /* Mark dynamically referenced symbols. */
8538 if (elf_hash_table (info
)->dynamic_sections_created
)
8539 elf_link_hash_traverse (elf_hash_table (info
),
8540 elf_gc_mark_dynamic_ref_symbol
,
8545 /* Grovel through relocs to find out who stays ... */
8546 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
8547 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8551 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8554 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8556 if (o
->flags
& SEC_KEEP
)
8558 /* _bfd_elf_discard_section_eh_frame knows how to discard
8559 orphaned FDEs so don't mark sections referenced by the
8560 EH frame section. */
8561 if (strcmp (o
->name
, ".eh_frame") == 0)
8563 else if (!elf_gc_mark (info
, o
, gc_mark_hook
))
8569 /* ... and mark SEC_EXCLUDE for those that go. */
8570 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
8576 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
8579 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
8581 struct elf_link_hash_entry
*h
,
8584 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
8585 struct elf_link_hash_entry
**search
, *child
;
8586 bfd_size_type extsymcount
;
8587 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8590 /* The sh_info field of the symtab header tells us where the
8591 external symbols start. We don't care about the local symbols at
8593 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
8594 if (!elf_bad_symtab (abfd
))
8595 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
8597 sym_hashes
= elf_sym_hashes (abfd
);
8598 sym_hashes_end
= sym_hashes
+ extsymcount
;
8600 /* Hunt down the child symbol, which is in this section at the same
8601 offset as the relocation. */
8602 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
8604 if ((child
= *search
) != NULL
8605 && (child
->root
.type
== bfd_link_hash_defined
8606 || child
->root
.type
== bfd_link_hash_defweak
)
8607 && child
->root
.u
.def
.section
== sec
8608 && child
->root
.u
.def
.value
== offset
)
8612 sec_name
= bfd_get_section_ident (sec
);
8613 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
8614 bfd_archive_filename (abfd
),
8615 sec_name
? sec_name
: sec
->name
,
8616 (unsigned long) offset
);
8617 bfd_set_error (bfd_error_invalid_operation
);
8623 /* This *should* only be the absolute section. It could potentially
8624 be that someone has defined a non-global vtable though, which
8625 would be bad. It isn't worth paging in the local symbols to be
8626 sure though; that case should simply be handled by the assembler. */
8628 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
8631 child
->vtable_parent
= h
;
8636 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
8639 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
8640 asection
*sec ATTRIBUTE_UNUSED
,
8641 struct elf_link_hash_entry
*h
,
8644 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8645 unsigned int log_file_align
= bed
->s
->log_file_align
;
8647 if (addend
>= h
->vtable_entries_size
)
8649 size_t size
, bytes
, file_align
;
8650 bfd_boolean
*ptr
= h
->vtable_entries_used
;
8652 /* While the symbol is undefined, we have to be prepared to handle
8654 file_align
= 1 << log_file_align
;
8655 if (h
->root
.type
== bfd_link_hash_undefined
)
8656 size
= addend
+ file_align
;
8662 /* Oops! We've got a reference past the defined end of
8663 the table. This is probably a bug -- shall we warn? */
8664 size
= addend
+ file_align
;
8667 size
= (size
+ file_align
- 1) & -file_align
;
8669 /* Allocate one extra entry for use as a "done" flag for the
8670 consolidation pass. */
8671 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
8675 ptr
= bfd_realloc (ptr
- 1, bytes
);
8681 oldbytes
= (((h
->vtable_entries_size
>> log_file_align
) + 1)
8682 * sizeof (bfd_boolean
));
8683 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
8687 ptr
= bfd_zmalloc (bytes
);
8692 /* And arrange for that done flag to be at index -1. */
8693 h
->vtable_entries_used
= ptr
+ 1;
8694 h
->vtable_entries_size
= size
;
8697 h
->vtable_entries_used
[addend
>> log_file_align
] = TRUE
;
8702 struct alloc_got_off_arg
{
8704 unsigned int got_elt_size
;
8707 /* We need a special top-level link routine to convert got reference counts
8708 to real got offsets. */
8711 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
8713 struct alloc_got_off_arg
*gofarg
= arg
;
8715 if (h
->root
.type
== bfd_link_hash_warning
)
8716 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8718 if (h
->got
.refcount
> 0)
8720 h
->got
.offset
= gofarg
->gotoff
;
8721 gofarg
->gotoff
+= gofarg
->got_elt_size
;
8724 h
->got
.offset
= (bfd_vma
) -1;
8729 /* And an accompanying bit to work out final got entry offsets once
8730 we're done. Should be called from final_link. */
8733 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
8734 struct bfd_link_info
*info
)
8737 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8739 unsigned int got_elt_size
= bed
->s
->arch_size
/ 8;
8740 struct alloc_got_off_arg gofarg
;
8742 if (! is_elf_hash_table (info
->hash
))
8745 /* The GOT offset is relative to the .got section, but the GOT header is
8746 put into the .got.plt section, if the backend uses it. */
8747 if (bed
->want_got_plt
)
8750 gotoff
= bed
->got_header_size
;
8752 /* Do the local .got entries first. */
8753 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
8755 bfd_signed_vma
*local_got
;
8756 bfd_size_type j
, locsymcount
;
8757 Elf_Internal_Shdr
*symtab_hdr
;
8759 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
8762 local_got
= elf_local_got_refcounts (i
);
8766 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
8767 if (elf_bad_symtab (i
))
8768 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8770 locsymcount
= symtab_hdr
->sh_info
;
8772 for (j
= 0; j
< locsymcount
; ++j
)
8774 if (local_got
[j
] > 0)
8776 local_got
[j
] = gotoff
;
8777 gotoff
+= got_elt_size
;
8780 local_got
[j
] = (bfd_vma
) -1;
8784 /* Then the global .got entries. .plt refcounts are handled by
8785 adjust_dynamic_symbol */
8786 gofarg
.gotoff
= gotoff
;
8787 gofarg
.got_elt_size
= got_elt_size
;
8788 elf_link_hash_traverse (elf_hash_table (info
),
8789 elf_gc_allocate_got_offsets
,
8794 /* Many folk need no more in the way of final link than this, once
8795 got entry reference counting is enabled. */
8798 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
8800 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
8803 /* Invoke the regular ELF backend linker to do all the work. */
8804 return bfd_elf_final_link (abfd
, info
);
8808 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
8810 struct elf_reloc_cookie
*rcookie
= cookie
;
8812 if (rcookie
->bad_symtab
)
8813 rcookie
->rel
= rcookie
->rels
;
8815 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8817 unsigned long r_symndx
;
8819 if (! rcookie
->bad_symtab
)
8820 if (rcookie
->rel
->r_offset
> offset
)
8822 if (rcookie
->rel
->r_offset
!= offset
)
8825 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
8826 if (r_symndx
== SHN_UNDEF
)
8829 if (r_symndx
>= rcookie
->locsymcount
8830 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
8832 struct elf_link_hash_entry
*h
;
8834 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8836 while (h
->root
.type
== bfd_link_hash_indirect
8837 || h
->root
.type
== bfd_link_hash_warning
)
8838 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8840 if ((h
->root
.type
== bfd_link_hash_defined
8841 || h
->root
.type
== bfd_link_hash_defweak
)
8842 && elf_discarded_section (h
->root
.u
.def
.section
))
8849 /* It's not a relocation against a global symbol,
8850 but it could be a relocation against a local
8851 symbol for a discarded section. */
8853 Elf_Internal_Sym
*isym
;
8855 /* Need to: get the symbol; get the section. */
8856 isym
= &rcookie
->locsyms
[r_symndx
];
8857 if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
8859 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
8860 if (isec
!= NULL
&& elf_discarded_section (isec
))
8869 /* Discard unneeded references to discarded sections.
8870 Returns TRUE if any section's size was changed. */
8871 /* This function assumes that the relocations are in sorted order,
8872 which is true for all known assemblers. */
8875 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
8877 struct elf_reloc_cookie cookie
;
8878 asection
*stab
, *eh
;
8879 Elf_Internal_Shdr
*symtab_hdr
;
8880 const struct elf_backend_data
*bed
;
8883 bfd_boolean ret
= FALSE
;
8885 if (info
->traditional_format
8886 || !is_elf_hash_table (info
->hash
))
8889 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8891 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8894 bed
= get_elf_backend_data (abfd
);
8896 if ((abfd
->flags
& DYNAMIC
) != 0)
8899 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8900 if (info
->relocatable
8903 || bfd_is_abs_section (eh
->output_section
))))
8906 stab
= bfd_get_section_by_name (abfd
, ".stab");
8909 || bfd_is_abs_section (stab
->output_section
)
8910 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
8915 && bed
->elf_backend_discard_info
== NULL
)
8918 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8920 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
8921 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
8922 if (cookie
.bad_symtab
)
8924 cookie
.locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8925 cookie
.extsymoff
= 0;
8929 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8930 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8933 if (bed
->s
->arch_size
== 32)
8934 cookie
.r_sym_shift
= 8;
8936 cookie
.r_sym_shift
= 32;
8938 cookie
.locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8939 if (cookie
.locsyms
== NULL
&& cookie
.locsymcount
!= 0)
8941 cookie
.locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
8942 cookie
.locsymcount
, 0,
8944 if (cookie
.locsyms
== NULL
)
8951 count
= stab
->reloc_count
;
8953 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, stab
, NULL
, NULL
,
8955 if (cookie
.rels
!= NULL
)
8957 cookie
.rel
= cookie
.rels
;
8958 cookie
.relend
= cookie
.rels
;
8959 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
8960 if (_bfd_discard_section_stabs (abfd
, stab
,
8961 elf_section_data (stab
)->sec_info
,
8962 bfd_elf_reloc_symbol_deleted_p
,
8965 if (elf_section_data (stab
)->relocs
!= cookie
.rels
)
8973 count
= eh
->reloc_count
;
8975 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, eh
, NULL
, NULL
,
8977 cookie
.rel
= cookie
.rels
;
8978 cookie
.relend
= cookie
.rels
;
8979 if (cookie
.rels
!= NULL
)
8980 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
8982 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
8983 bfd_elf_reloc_symbol_deleted_p
,
8987 if (cookie
.rels
!= NULL
8988 && elf_section_data (eh
)->relocs
!= cookie
.rels
)
8992 if (bed
->elf_backend_discard_info
!= NULL
8993 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
8996 if (cookie
.locsyms
!= NULL
8997 && symtab_hdr
->contents
!= (unsigned char *) cookie
.locsyms
)
8999 if (! info
->keep_memory
)
9000 free (cookie
.locsyms
);
9002 symtab_hdr
->contents
= (unsigned char *) cookie
.locsyms
;
9006 if (info
->eh_frame_hdr
9007 && !info
->relocatable
9008 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))