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. */
2738 elf_sort_symbol (const void *arg1
, const void *arg2
)
2740 const struct elf_link_hash_entry
*h1
;
2741 const struct elf_link_hash_entry
*h2
;
2743 h1
= *(const struct elf_link_hash_entry
**) arg1
;
2744 h2
= *(const struct elf_link_hash_entry
**) arg2
;
2746 /* Coded this way to avoid bugs in various versions of gcc. */
2747 if (h1
->root
.u
.def
.value
< h2
->root
.u
.def
.value
)
2749 if (h1
->root
.u
.def
.value
> h2
->root
.u
.def
.value
)
2751 if (h1
->root
.u
.def
.section
< h2
->root
.u
.def
.section
)
2753 if (h1
->root
.u
.def
.section
> h2
->root
.u
.def
.section
)
2759 /* This function is used to adjust offsets into .dynstr for
2760 dynamic symbols. This is called via elf_link_hash_traverse. */
2763 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
2765 struct elf_strtab_hash
*dynstr
= data
;
2767 if (h
->root
.type
== bfd_link_hash_warning
)
2768 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2770 if (h
->dynindx
!= -1)
2771 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
2775 /* Assign string offsets in .dynstr, update all structures referencing
2779 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
2781 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
2782 struct elf_link_local_dynamic_entry
*entry
;
2783 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
2784 bfd
*dynobj
= hash_table
->dynobj
;
2787 const struct elf_backend_data
*bed
;
2790 _bfd_elf_strtab_finalize (dynstr
);
2791 size
= _bfd_elf_strtab_size (dynstr
);
2793 bed
= get_elf_backend_data (dynobj
);
2794 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2795 BFD_ASSERT (sdyn
!= NULL
);
2797 /* Update all .dynamic entries referencing .dynstr strings. */
2798 for (extdyn
= sdyn
->contents
;
2799 extdyn
< sdyn
->contents
+ sdyn
->size
;
2800 extdyn
+= bed
->s
->sizeof_dyn
)
2802 Elf_Internal_Dyn dyn
;
2804 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
2808 dyn
.d_un
.d_val
= size
;
2816 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
2821 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
2824 /* Now update local dynamic symbols. */
2825 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
2826 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
2827 entry
->isym
.st_name
);
2829 /* And the rest of dynamic symbols. */
2830 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
2832 /* Adjust version definitions. */
2833 if (elf_tdata (output_bfd
)->cverdefs
)
2838 Elf_Internal_Verdef def
;
2839 Elf_Internal_Verdaux defaux
;
2841 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2845 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
2847 p
+= sizeof (Elf_External_Verdef
);
2848 for (i
= 0; i
< def
.vd_cnt
; ++i
)
2850 _bfd_elf_swap_verdaux_in (output_bfd
,
2851 (Elf_External_Verdaux
*) p
, &defaux
);
2852 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
2854 _bfd_elf_swap_verdaux_out (output_bfd
,
2855 &defaux
, (Elf_External_Verdaux
*) p
);
2856 p
+= sizeof (Elf_External_Verdaux
);
2859 while (def
.vd_next
);
2862 /* Adjust version references. */
2863 if (elf_tdata (output_bfd
)->verref
)
2868 Elf_Internal_Verneed need
;
2869 Elf_Internal_Vernaux needaux
;
2871 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2875 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
2877 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
2878 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
2879 (Elf_External_Verneed
*) p
);
2880 p
+= sizeof (Elf_External_Verneed
);
2881 for (i
= 0; i
< need
.vn_cnt
; ++i
)
2883 _bfd_elf_swap_vernaux_in (output_bfd
,
2884 (Elf_External_Vernaux
*) p
, &needaux
);
2885 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
2887 _bfd_elf_swap_vernaux_out (output_bfd
,
2889 (Elf_External_Vernaux
*) p
);
2890 p
+= sizeof (Elf_External_Vernaux
);
2893 while (need
.vn_next
);
2899 /* Add symbols from an ELF object file to the linker hash table. */
2902 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
2904 bfd_boolean (*add_symbol_hook
)
2905 (bfd
*, struct bfd_link_info
*, Elf_Internal_Sym
*,
2906 const char **, flagword
*, asection
**, bfd_vma
*);
2907 bfd_boolean (*check_relocs
)
2908 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
2909 bfd_boolean (*check_directives
)
2910 (bfd
*, struct bfd_link_info
*);
2911 bfd_boolean collect
;
2912 Elf_Internal_Shdr
*hdr
;
2913 bfd_size_type symcount
;
2914 bfd_size_type extsymcount
;
2915 bfd_size_type extsymoff
;
2916 struct elf_link_hash_entry
**sym_hash
;
2917 bfd_boolean dynamic
;
2918 Elf_External_Versym
*extversym
= NULL
;
2919 Elf_External_Versym
*ever
;
2920 struct elf_link_hash_entry
*weaks
;
2921 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
2922 bfd_size_type nondeflt_vers_cnt
= 0;
2923 Elf_Internal_Sym
*isymbuf
= NULL
;
2924 Elf_Internal_Sym
*isym
;
2925 Elf_Internal_Sym
*isymend
;
2926 const struct elf_backend_data
*bed
;
2927 bfd_boolean add_needed
;
2928 struct elf_link_hash_table
* hash_table
;
2931 hash_table
= elf_hash_table (info
);
2933 bed
= get_elf_backend_data (abfd
);
2934 add_symbol_hook
= bed
->elf_add_symbol_hook
;
2935 collect
= bed
->collect
;
2937 if ((abfd
->flags
& DYNAMIC
) == 0)
2943 /* You can't use -r against a dynamic object. Also, there's no
2944 hope of using a dynamic object which does not exactly match
2945 the format of the output file. */
2946 if (info
->relocatable
2947 || !is_elf_hash_table (hash_table
)
2948 || hash_table
->root
.creator
!= abfd
->xvec
)
2950 bfd_set_error (bfd_error_invalid_operation
);
2955 /* As a GNU extension, any input sections which are named
2956 .gnu.warning.SYMBOL are treated as warning symbols for the given
2957 symbol. This differs from .gnu.warning sections, which generate
2958 warnings when they are included in an output file. */
2959 if (info
->executable
)
2963 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2967 name
= bfd_get_section_name (abfd
, s
);
2968 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
2972 bfd_size_type prefix_len
;
2973 const char * gnu_warning_prefix
= _("warning: ");
2975 name
+= sizeof ".gnu.warning." - 1;
2977 /* If this is a shared object, then look up the symbol
2978 in the hash table. If it is there, and it is already
2979 been defined, then we will not be using the entry
2980 from this shared object, so we don't need to warn.
2981 FIXME: If we see the definition in a regular object
2982 later on, we will warn, but we shouldn't. The only
2983 fix is to keep track of what warnings we are supposed
2984 to emit, and then handle them all at the end of the
2988 struct elf_link_hash_entry
*h
;
2990 h
= elf_link_hash_lookup (hash_table
, name
,
2991 FALSE
, FALSE
, TRUE
);
2993 /* FIXME: What about bfd_link_hash_common? */
2995 && (h
->root
.type
== bfd_link_hash_defined
2996 || h
->root
.type
== bfd_link_hash_defweak
))
2998 /* We don't want to issue this warning. Clobber
2999 the section size so that the warning does not
3000 get copied into the output file. */
3007 prefix_len
= strlen (gnu_warning_prefix
);
3008 msg
= bfd_alloc (abfd
, prefix_len
+ sz
+ 1);
3012 strcpy (msg
, gnu_warning_prefix
);
3013 if (! bfd_get_section_contents (abfd
, s
, msg
+ prefix_len
, 0, sz
))
3016 msg
[prefix_len
+ sz
] = '\0';
3018 if (! (_bfd_generic_link_add_one_symbol
3019 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3020 FALSE
, collect
, NULL
)))
3023 if (! info
->relocatable
)
3025 /* Clobber the section size so that the warning does
3026 not get copied into the output file. */
3036 /* If we are creating a shared library, create all the dynamic
3037 sections immediately. We need to attach them to something,
3038 so we attach them to this BFD, provided it is the right
3039 format. FIXME: If there are no input BFD's of the same
3040 format as the output, we can't make a shared library. */
3042 && is_elf_hash_table (hash_table
)
3043 && hash_table
->root
.creator
== abfd
->xvec
3044 && ! hash_table
->dynamic_sections_created
)
3046 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3050 else if (!is_elf_hash_table (hash_table
))
3055 const char *soname
= NULL
;
3056 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3059 /* ld --just-symbols and dynamic objects don't mix very well.
3060 Test for --just-symbols by looking at info set up by
3061 _bfd_elf_link_just_syms. */
3062 if ((s
= abfd
->sections
) != NULL
3063 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3066 /* If this dynamic lib was specified on the command line with
3067 --as-needed in effect, then we don't want to add a DT_NEEDED
3068 tag unless the lib is actually used. Similary for libs brought
3069 in by another lib's DT_NEEDED. */
3070 add_needed
= elf_dyn_lib_class (abfd
) == DYN_NORMAL
;
3072 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3078 unsigned long shlink
;
3080 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3081 goto error_free_dyn
;
3083 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3085 goto error_free_dyn
;
3086 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3088 for (extdyn
= dynbuf
;
3089 extdyn
< dynbuf
+ s
->size
;
3090 extdyn
+= bed
->s
->sizeof_dyn
)
3092 Elf_Internal_Dyn dyn
;
3094 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3095 if (dyn
.d_tag
== DT_SONAME
)
3097 unsigned int tagv
= dyn
.d_un
.d_val
;
3098 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3100 goto error_free_dyn
;
3102 if (dyn
.d_tag
== DT_NEEDED
)
3104 struct bfd_link_needed_list
*n
, **pn
;
3106 unsigned int tagv
= dyn
.d_un
.d_val
;
3108 amt
= sizeof (struct bfd_link_needed_list
);
3109 n
= bfd_alloc (abfd
, amt
);
3110 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3111 if (n
== NULL
|| fnm
== NULL
)
3112 goto error_free_dyn
;
3113 amt
= strlen (fnm
) + 1;
3114 anm
= bfd_alloc (abfd
, amt
);
3116 goto error_free_dyn
;
3117 memcpy (anm
, fnm
, amt
);
3121 for (pn
= & hash_table
->needed
;
3127 if (dyn
.d_tag
== DT_RUNPATH
)
3129 struct bfd_link_needed_list
*n
, **pn
;
3131 unsigned int tagv
= dyn
.d_un
.d_val
;
3133 amt
= sizeof (struct bfd_link_needed_list
);
3134 n
= bfd_alloc (abfd
, amt
);
3135 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3136 if (n
== NULL
|| fnm
== NULL
)
3137 goto error_free_dyn
;
3138 amt
= strlen (fnm
) + 1;
3139 anm
= bfd_alloc (abfd
, amt
);
3141 goto error_free_dyn
;
3142 memcpy (anm
, fnm
, amt
);
3146 for (pn
= & runpath
;
3152 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3153 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3155 struct bfd_link_needed_list
*n
, **pn
;
3157 unsigned int tagv
= dyn
.d_un
.d_val
;
3159 amt
= sizeof (struct bfd_link_needed_list
);
3160 n
= bfd_alloc (abfd
, amt
);
3161 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3162 if (n
== NULL
|| fnm
== NULL
)
3163 goto error_free_dyn
;
3164 amt
= strlen (fnm
) + 1;
3165 anm
= bfd_alloc (abfd
, amt
);
3172 memcpy (anm
, fnm
, amt
);
3187 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3188 frees all more recently bfd_alloc'd blocks as well. */
3194 struct bfd_link_needed_list
**pn
;
3195 for (pn
= & hash_table
->runpath
;
3202 /* We do not want to include any of the sections in a dynamic
3203 object in the output file. We hack by simply clobbering the
3204 list of sections in the BFD. This could be handled more
3205 cleanly by, say, a new section flag; the existing
3206 SEC_NEVER_LOAD flag is not the one we want, because that one
3207 still implies that the section takes up space in the output
3209 bfd_section_list_clear (abfd
);
3211 /* If this is the first dynamic object found in the link, create
3212 the special sections required for dynamic linking. */
3213 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3216 /* Find the name to use in a DT_NEEDED entry that refers to this
3217 object. If the object has a DT_SONAME entry, we use it.
3218 Otherwise, if the generic linker stuck something in
3219 elf_dt_name, we use that. Otherwise, we just use the file
3221 if (soname
== NULL
|| *soname
== '\0')
3223 soname
= elf_dt_name (abfd
);
3224 if (soname
== NULL
|| *soname
== '\0')
3225 soname
= bfd_get_filename (abfd
);
3228 /* Save the SONAME because sometimes the linker emulation code
3229 will need to know it. */
3230 elf_dt_name (abfd
) = soname
;
3232 ret
= elf_add_dt_needed_tag (info
, soname
, add_needed
);
3236 /* If we have already included this dynamic object in the
3237 link, just ignore it. There is no reason to include a
3238 particular dynamic object more than once. */
3243 /* If this is a dynamic object, we always link against the .dynsym
3244 symbol table, not the .symtab symbol table. The dynamic linker
3245 will only see the .dynsym symbol table, so there is no reason to
3246 look at .symtab for a dynamic object. */
3248 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3249 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3251 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3253 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3255 /* The sh_info field of the symtab header tells us where the
3256 external symbols start. We don't care about the local symbols at
3258 if (elf_bad_symtab (abfd
))
3260 extsymcount
= symcount
;
3265 extsymcount
= symcount
- hdr
->sh_info
;
3266 extsymoff
= hdr
->sh_info
;
3270 if (extsymcount
!= 0)
3272 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3274 if (isymbuf
== NULL
)
3277 /* We store a pointer to the hash table entry for each external
3279 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3280 sym_hash
= bfd_alloc (abfd
, amt
);
3281 if (sym_hash
== NULL
)
3282 goto error_free_sym
;
3283 elf_sym_hashes (abfd
) = sym_hash
;
3288 /* Read in any version definitions. */
3289 if (! _bfd_elf_slurp_version_tables (abfd
))
3290 goto error_free_sym
;
3292 /* Read in the symbol versions, but don't bother to convert them
3293 to internal format. */
3294 if (elf_dynversym (abfd
) != 0)
3296 Elf_Internal_Shdr
*versymhdr
;
3298 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3299 extversym
= bfd_malloc (versymhdr
->sh_size
);
3300 if (extversym
== NULL
)
3301 goto error_free_sym
;
3302 amt
= versymhdr
->sh_size
;
3303 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3304 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3305 goto error_free_vers
;
3311 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3312 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3314 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3321 struct elf_link_hash_entry
*h
;
3322 bfd_boolean definition
;
3323 bfd_boolean size_change_ok
;
3324 bfd_boolean type_change_ok
;
3325 bfd_boolean new_weakdef
;
3326 bfd_boolean override
;
3327 unsigned int old_alignment
;
3332 flags
= BSF_NO_FLAGS
;
3334 value
= isym
->st_value
;
3337 bind
= ELF_ST_BIND (isym
->st_info
);
3338 if (bind
== STB_LOCAL
)
3340 /* This should be impossible, since ELF requires that all
3341 global symbols follow all local symbols, and that sh_info
3342 point to the first global symbol. Unfortunately, Irix 5
3346 else if (bind
== STB_GLOBAL
)
3348 if (isym
->st_shndx
!= SHN_UNDEF
3349 && isym
->st_shndx
!= SHN_COMMON
)
3352 else if (bind
== STB_WEAK
)
3356 /* Leave it up to the processor backend. */
3359 if (isym
->st_shndx
== SHN_UNDEF
)
3360 sec
= bfd_und_section_ptr
;
3361 else if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
3363 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3365 sec
= bfd_abs_section_ptr
;
3366 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3369 else if (isym
->st_shndx
== SHN_ABS
)
3370 sec
= bfd_abs_section_ptr
;
3371 else if (isym
->st_shndx
== SHN_COMMON
)
3373 sec
= bfd_com_section_ptr
;
3374 /* What ELF calls the size we call the value. What ELF
3375 calls the value we call the alignment. */
3376 value
= isym
->st_size
;
3380 /* Leave it up to the processor backend. */
3383 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3386 goto error_free_vers
;
3388 if (isym
->st_shndx
== SHN_COMMON
3389 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
3391 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3395 tcomm
= bfd_make_section (abfd
, ".tcommon");
3397 || !bfd_set_section_flags (abfd
, tcomm
, (SEC_ALLOC
3399 | SEC_LINKER_CREATED
3400 | SEC_THREAD_LOCAL
)))
3401 goto error_free_vers
;
3405 else if (add_symbol_hook
)
3407 if (! (*add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
, &sec
,
3409 goto error_free_vers
;
3411 /* The hook function sets the name to NULL if this symbol
3412 should be skipped for some reason. */
3417 /* Sanity check that all possibilities were handled. */
3420 bfd_set_error (bfd_error_bad_value
);
3421 goto error_free_vers
;
3424 if (bfd_is_und_section (sec
)
3425 || bfd_is_com_section (sec
))
3430 size_change_ok
= FALSE
;
3431 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
3435 if (is_elf_hash_table (hash_table
))
3437 Elf_Internal_Versym iver
;
3438 unsigned int vernum
= 0;
3443 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
3444 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
3446 /* If this is a hidden symbol, or if it is not version
3447 1, we append the version name to the symbol name.
3448 However, we do not modify a non-hidden absolute
3449 symbol, because it might be the version symbol
3450 itself. FIXME: What if it isn't? */
3451 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
3452 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
3455 size_t namelen
, verlen
, newlen
;
3458 if (isym
->st_shndx
!= SHN_UNDEF
)
3460 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
3462 (*_bfd_error_handler
)
3463 (_("%s: %s: invalid version %u (max %d)"),
3464 bfd_archive_filename (abfd
), name
, vernum
,
3465 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
3466 bfd_set_error (bfd_error_bad_value
);
3467 goto error_free_vers
;
3469 else if (vernum
> 1)
3471 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
3477 /* We cannot simply test for the number of
3478 entries in the VERNEED section since the
3479 numbers for the needed versions do not start
3481 Elf_Internal_Verneed
*t
;
3484 for (t
= elf_tdata (abfd
)->verref
;
3488 Elf_Internal_Vernaux
*a
;
3490 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3492 if (a
->vna_other
== vernum
)
3494 verstr
= a
->vna_nodename
;
3503 (*_bfd_error_handler
)
3504 (_("%s: %s: invalid needed version %d"),
3505 bfd_archive_filename (abfd
), name
, vernum
);
3506 bfd_set_error (bfd_error_bad_value
);
3507 goto error_free_vers
;
3511 namelen
= strlen (name
);
3512 verlen
= strlen (verstr
);
3513 newlen
= namelen
+ verlen
+ 2;
3514 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3515 && isym
->st_shndx
!= SHN_UNDEF
)
3518 newname
= bfd_alloc (abfd
, newlen
);
3519 if (newname
== NULL
)
3520 goto error_free_vers
;
3521 memcpy (newname
, name
, namelen
);
3522 p
= newname
+ namelen
;
3524 /* If this is a defined non-hidden version symbol,
3525 we add another @ to the name. This indicates the
3526 default version of the symbol. */
3527 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3528 && isym
->st_shndx
!= SHN_UNDEF
)
3530 memcpy (p
, verstr
, verlen
+ 1);
3536 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
3537 sym_hash
, &skip
, &override
,
3538 &type_change_ok
, &size_change_ok
))
3539 goto error_free_vers
;
3548 while (h
->root
.type
== bfd_link_hash_indirect
3549 || h
->root
.type
== bfd_link_hash_warning
)
3550 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3552 /* Remember the old alignment if this is a common symbol, so
3553 that we don't reduce the alignment later on. We can't
3554 check later, because _bfd_generic_link_add_one_symbol
3555 will set a default for the alignment which we want to
3556 override. We also remember the old bfd where the existing
3557 definition comes from. */
3558 switch (h
->root
.type
)
3563 case bfd_link_hash_defined
:
3564 case bfd_link_hash_defweak
:
3565 old_bfd
= h
->root
.u
.def
.section
->owner
;
3568 case bfd_link_hash_common
:
3569 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
3570 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
3574 if (elf_tdata (abfd
)->verdef
!= NULL
3578 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
3581 if (! (_bfd_generic_link_add_one_symbol
3582 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, collect
,
3583 (struct bfd_link_hash_entry
**) sym_hash
)))
3584 goto error_free_vers
;
3587 while (h
->root
.type
== bfd_link_hash_indirect
3588 || h
->root
.type
== bfd_link_hash_warning
)
3589 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3592 new_weakdef
= FALSE
;
3595 && (flags
& BSF_WEAK
) != 0
3596 && ELF_ST_TYPE (isym
->st_info
) != STT_FUNC
3597 && is_elf_hash_table (hash_table
)
3598 && h
->weakdef
== NULL
)
3600 /* Keep a list of all weak defined non function symbols from
3601 a dynamic object, using the weakdef field. Later in this
3602 function we will set the weakdef field to the correct
3603 value. We only put non-function symbols from dynamic
3604 objects on this list, because that happens to be the only
3605 time we need to know the normal symbol corresponding to a
3606 weak symbol, and the information is time consuming to
3607 figure out. If the weakdef field is not already NULL,
3608 then this symbol was already defined by some previous
3609 dynamic object, and we will be using that previous
3610 definition anyhow. */
3617 /* Set the alignment of a common symbol. */
3618 if (isym
->st_shndx
== SHN_COMMON
3619 && h
->root
.type
== bfd_link_hash_common
)
3623 align
= bfd_log2 (isym
->st_value
);
3624 if (align
> old_alignment
3625 /* Permit an alignment power of zero if an alignment of one
3626 is specified and no other alignments have been specified. */
3627 || (isym
->st_value
== 1 && old_alignment
== 0))
3628 h
->root
.u
.c
.p
->alignment_power
= align
;
3630 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
3633 if (is_elf_hash_table (hash_table
))
3639 /* Check the alignment when a common symbol is involved. This
3640 can change when a common symbol is overridden by a normal
3641 definition or a common symbol is ignored due to the old
3642 normal definition. We need to make sure the maximum
3643 alignment is maintained. */
3644 if ((old_alignment
|| isym
->st_shndx
== SHN_COMMON
)
3645 && h
->root
.type
!= bfd_link_hash_common
)
3647 unsigned int common_align
;
3648 unsigned int normal_align
;
3649 unsigned int symbol_align
;
3653 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
3654 if (h
->root
.u
.def
.section
->owner
!= NULL
3655 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3657 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
3658 if (normal_align
> symbol_align
)
3659 normal_align
= symbol_align
;
3662 normal_align
= symbol_align
;
3666 common_align
= old_alignment
;
3667 common_bfd
= old_bfd
;
3672 common_align
= bfd_log2 (isym
->st_value
);
3674 normal_bfd
= old_bfd
;
3677 if (normal_align
< common_align
)
3678 (*_bfd_error_handler
)
3679 (_("Warning: alignment %u of symbol `%s' in %s is smaller than %u in %s"),
3682 bfd_archive_filename (normal_bfd
),
3684 bfd_archive_filename (common_bfd
));
3687 /* Remember the symbol size and type. */
3688 if (isym
->st_size
!= 0
3689 && (definition
|| h
->size
== 0))
3691 if (h
->size
!= 0 && h
->size
!= isym
->st_size
&& ! size_change_ok
)
3692 (*_bfd_error_handler
)
3693 (_("Warning: size of symbol `%s' changed from %lu in %s to %lu in %s"),
3694 name
, (unsigned long) h
->size
,
3695 bfd_archive_filename (old_bfd
),
3696 (unsigned long) isym
->st_size
,
3697 bfd_archive_filename (abfd
));
3699 h
->size
= isym
->st_size
;
3702 /* If this is a common symbol, then we always want H->SIZE
3703 to be the size of the common symbol. The code just above
3704 won't fix the size if a common symbol becomes larger. We
3705 don't warn about a size change here, because that is
3706 covered by --warn-common. */
3707 if (h
->root
.type
== bfd_link_hash_common
)
3708 h
->size
= h
->root
.u
.c
.size
;
3710 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
3711 && (definition
|| h
->type
== STT_NOTYPE
))
3713 if (h
->type
!= STT_NOTYPE
3714 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
3715 && ! type_change_ok
)
3716 (*_bfd_error_handler
)
3717 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
3718 name
, h
->type
, ELF_ST_TYPE (isym
->st_info
),
3719 bfd_archive_filename (abfd
));
3721 h
->type
= ELF_ST_TYPE (isym
->st_info
);
3724 /* If st_other has a processor-specific meaning, specific
3725 code might be needed here. We never merge the visibility
3726 attribute with the one from a dynamic object. */
3727 if (bed
->elf_backend_merge_symbol_attribute
)
3728 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
3731 if (isym
->st_other
!= 0 && !dynamic
)
3733 unsigned char hvis
, symvis
, other
, nvis
;
3735 /* Take the balance of OTHER from the definition. */
3736 other
= (definition
? isym
->st_other
: h
->other
);
3737 other
&= ~ ELF_ST_VISIBILITY (-1);
3739 /* Combine visibilities, using the most constraining one. */
3740 hvis
= ELF_ST_VISIBILITY (h
->other
);
3741 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
3747 nvis
= hvis
< symvis
? hvis
: symvis
;
3749 h
->other
= other
| nvis
;
3752 /* Set a flag in the hash table entry indicating the type of
3753 reference or definition we just found. Keep a count of
3754 the number of dynamic symbols we find. A dynamic symbol
3755 is one which is referenced or defined by both a regular
3756 object and a shared object. */
3757 old_flags
= h
->elf_link_hash_flags
;
3763 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
3764 if (bind
!= STB_WEAK
)
3765 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3768 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
3769 if (! info
->executable
3770 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
3771 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
3777 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
3779 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
3780 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
3781 | ELF_LINK_HASH_REF_REGULAR
)) != 0
3782 || (h
->weakdef
!= NULL
3784 && h
->weakdef
->dynindx
!= -1))
3788 h
->elf_link_hash_flags
|= new_flag
;
3790 /* Check to see if we need to add an indirect symbol for
3791 the default name. */
3792 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
3793 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
3794 &sec
, &value
, &dynsym
,
3796 goto error_free_vers
;
3798 if (definition
&& !dynamic
)
3800 char *p
= strchr (name
, ELF_VER_CHR
);
3801 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
3803 /* Queue non-default versions so that .symver x, x@FOO
3804 aliases can be checked. */
3805 if (! nondeflt_vers
)
3807 amt
= (isymend
- isym
+ 1)
3808 * sizeof (struct elf_link_hash_entry
*);
3809 nondeflt_vers
= bfd_malloc (amt
);
3811 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
3815 if (dynsym
&& h
->dynindx
== -1)
3817 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3818 goto error_free_vers
;
3819 if (h
->weakdef
!= NULL
3821 && h
->weakdef
->dynindx
== -1)
3823 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
3824 goto error_free_vers
;
3827 else if (dynsym
&& h
->dynindx
!= -1)
3828 /* If the symbol already has a dynamic index, but
3829 visibility says it should not be visible, turn it into
3831 switch (ELF_ST_VISIBILITY (h
->other
))
3835 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
3843 && (h
->elf_link_hash_flags
3844 & ELF_LINK_HASH_REF_REGULAR
) != 0)
3847 const char *soname
= elf_dt_name (abfd
);
3849 /* A symbol from a library loaded via DT_NEEDED of some
3850 other library is referenced by a regular object.
3851 Add a DT_NEEDED entry for it. */
3853 ret
= elf_add_dt_needed_tag (info
, soname
, add_needed
);
3855 goto error_free_vers
;
3857 BFD_ASSERT (ret
== 0);
3862 /* Now that all the symbols from this input file are created, handle
3863 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
3864 if (nondeflt_vers
!= NULL
)
3866 bfd_size_type cnt
, symidx
;
3868 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
3870 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
3871 char *shortname
, *p
;
3873 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3875 || (h
->root
.type
!= bfd_link_hash_defined
3876 && h
->root
.type
!= bfd_link_hash_defweak
))
3879 amt
= p
- h
->root
.root
.string
;
3880 shortname
= bfd_malloc (amt
+ 1);
3881 memcpy (shortname
, h
->root
.root
.string
, amt
);
3882 shortname
[amt
] = '\0';
3884 hi
= (struct elf_link_hash_entry
*)
3885 bfd_link_hash_lookup (&hash_table
->root
, shortname
,
3886 FALSE
, FALSE
, FALSE
);
3888 && hi
->root
.type
== h
->root
.type
3889 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
3890 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
3892 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
3893 hi
->root
.type
= bfd_link_hash_indirect
;
3894 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
3895 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
3896 sym_hash
= elf_sym_hashes (abfd
);
3898 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
3899 if (sym_hash
[symidx
] == hi
)
3901 sym_hash
[symidx
] = h
;
3907 free (nondeflt_vers
);
3908 nondeflt_vers
= NULL
;
3911 if (extversym
!= NULL
)
3917 if (isymbuf
!= NULL
)
3921 /* Now set the weakdefs field correctly for all the weak defined
3922 symbols we found. The only way to do this is to search all the
3923 symbols. Since we only need the information for non functions in
3924 dynamic objects, that's the only time we actually put anything on
3925 the list WEAKS. We need this information so that if a regular
3926 object refers to a symbol defined weakly in a dynamic object, the
3927 real symbol in the dynamic object is also put in the dynamic
3928 symbols; we also must arrange for both symbols to point to the
3929 same memory location. We could handle the general case of symbol
3930 aliasing, but a general symbol alias can only be generated in
3931 assembler code, handling it correctly would be very time
3932 consuming, and other ELF linkers don't handle general aliasing
3936 struct elf_link_hash_entry
**hpp
;
3937 struct elf_link_hash_entry
**hppend
;
3938 struct elf_link_hash_entry
**sorted_sym_hash
;
3939 struct elf_link_hash_entry
*h
;
3942 /* Since we have to search the whole symbol list for each weak
3943 defined symbol, search time for N weak defined symbols will be
3944 O(N^2). Binary search will cut it down to O(NlogN). */
3945 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3946 sorted_sym_hash
= bfd_malloc (amt
);
3947 if (sorted_sym_hash
== NULL
)
3949 sym_hash
= sorted_sym_hash
;
3950 hpp
= elf_sym_hashes (abfd
);
3951 hppend
= hpp
+ extsymcount
;
3953 for (; hpp
< hppend
; hpp
++)
3957 && h
->root
.type
== bfd_link_hash_defined
3958 && h
->type
!= STT_FUNC
)
3966 qsort (sorted_sym_hash
, sym_count
,
3967 sizeof (struct elf_link_hash_entry
*),
3970 while (weaks
!= NULL
)
3972 struct elf_link_hash_entry
*hlook
;
3979 weaks
= hlook
->weakdef
;
3980 hlook
->weakdef
= NULL
;
3982 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
3983 || hlook
->root
.type
== bfd_link_hash_defweak
3984 || hlook
->root
.type
== bfd_link_hash_common
3985 || hlook
->root
.type
== bfd_link_hash_indirect
);
3986 slook
= hlook
->root
.u
.def
.section
;
3987 vlook
= hlook
->root
.u
.def
.value
;
3994 bfd_signed_vma vdiff
;
3996 h
= sorted_sym_hash
[idx
];
3997 vdiff
= vlook
- h
->root
.u
.def
.value
;
4004 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4017 /* We didn't find a value/section match. */
4021 for (i
= ilook
; i
< sym_count
; i
++)
4023 h
= sorted_sym_hash
[i
];
4025 /* Stop if value or section doesn't match. */
4026 if (h
->root
.u
.def
.value
!= vlook
4027 || h
->root
.u
.def
.section
!= slook
)
4029 else if (h
!= hlook
)
4033 /* If the weak definition is in the list of dynamic
4034 symbols, make sure the real definition is put
4036 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4038 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4042 /* If the real definition is in the list of dynamic
4043 symbols, make sure the weak definition is put
4044 there as well. If we don't do this, then the
4045 dynamic loader might not merge the entries for the
4046 real definition and the weak definition. */
4047 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4049 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4057 free (sorted_sym_hash
);
4060 check_directives
= get_elf_backend_data (abfd
)->check_directives
;
4061 if (check_directives
)
4062 check_directives (abfd
, info
);
4064 /* If this object is the same format as the output object, and it is
4065 not a shared library, then let the backend look through the
4068 This is required to build global offset table entries and to
4069 arrange for dynamic relocs. It is not required for the
4070 particular common case of linking non PIC code, even when linking
4071 against shared libraries, but unfortunately there is no way of
4072 knowing whether an object file has been compiled PIC or not.
4073 Looking through the relocs is not particularly time consuming.
4074 The problem is that we must either (1) keep the relocs in memory,
4075 which causes the linker to require additional runtime memory or
4076 (2) read the relocs twice from the input file, which wastes time.
4077 This would be a good case for using mmap.
4079 I have no idea how to handle linking PIC code into a file of a
4080 different format. It probably can't be done. */
4081 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
4083 && is_elf_hash_table (hash_table
)
4084 && hash_table
->root
.creator
== abfd
->xvec
4085 && check_relocs
!= NULL
)
4089 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4091 Elf_Internal_Rela
*internal_relocs
;
4094 if ((o
->flags
& SEC_RELOC
) == 0
4095 || o
->reloc_count
== 0
4096 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4097 && (o
->flags
& SEC_DEBUGGING
) != 0)
4098 || bfd_is_abs_section (o
->output_section
))
4101 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4103 if (internal_relocs
== NULL
)
4106 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
4108 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4109 free (internal_relocs
);
4116 /* If this is a non-traditional link, try to optimize the handling
4117 of the .stab/.stabstr sections. */
4119 && ! info
->traditional_format
4120 && is_elf_hash_table (hash_table
)
4121 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4125 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4126 if (stabstr
!= NULL
)
4128 bfd_size_type string_offset
= 0;
4131 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4132 if (strncmp (".stab", stab
->name
, 5) == 0
4133 && (!stab
->name
[5] ||
4134 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4135 && (stab
->flags
& SEC_MERGE
) == 0
4136 && !bfd_is_abs_section (stab
->output_section
))
4138 struct bfd_elf_section_data
*secdata
;
4140 secdata
= elf_section_data (stab
);
4141 if (! _bfd_link_section_stabs (abfd
,
4142 &hash_table
->stab_info
,
4147 if (secdata
->sec_info
)
4148 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4153 if (is_elf_hash_table (hash_table
))
4155 /* Add this bfd to the loaded list. */
4156 struct elf_link_loaded_list
*n
;
4158 n
= bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4162 n
->next
= hash_table
->loaded
;
4163 hash_table
->loaded
= n
;
4169 if (nondeflt_vers
!= NULL
)
4170 free (nondeflt_vers
);
4171 if (extversym
!= NULL
)
4174 if (isymbuf
!= NULL
)
4180 /* Add symbols from an ELF archive file to the linker hash table. We
4181 don't use _bfd_generic_link_add_archive_symbols because of a
4182 problem which arises on UnixWare. The UnixWare libc.so is an
4183 archive which includes an entry libc.so.1 which defines a bunch of
4184 symbols. The libc.so archive also includes a number of other
4185 object files, which also define symbols, some of which are the same
4186 as those defined in libc.so.1. Correct linking requires that we
4187 consider each object file in turn, and include it if it defines any
4188 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4189 this; it looks through the list of undefined symbols, and includes
4190 any object file which defines them. When this algorithm is used on
4191 UnixWare, it winds up pulling in libc.so.1 early and defining a
4192 bunch of symbols. This means that some of the other objects in the
4193 archive are not included in the link, which is incorrect since they
4194 precede libc.so.1 in the archive.
4196 Fortunately, ELF archive handling is simpler than that done by
4197 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4198 oddities. In ELF, if we find a symbol in the archive map, and the
4199 symbol is currently undefined, we know that we must pull in that
4202 Unfortunately, we do have to make multiple passes over the symbol
4203 table until nothing further is resolved. */
4206 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4209 bfd_boolean
*defined
= NULL
;
4210 bfd_boolean
*included
= NULL
;
4215 if (! bfd_has_map (abfd
))
4217 /* An empty archive is a special case. */
4218 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4220 bfd_set_error (bfd_error_no_armap
);
4224 /* Keep track of all symbols we know to be already defined, and all
4225 files we know to be already included. This is to speed up the
4226 second and subsequent passes. */
4227 c
= bfd_ardata (abfd
)->symdef_count
;
4231 amt
*= sizeof (bfd_boolean
);
4232 defined
= bfd_zmalloc (amt
);
4233 included
= bfd_zmalloc (amt
);
4234 if (defined
== NULL
|| included
== NULL
)
4237 symdefs
= bfd_ardata (abfd
)->symdefs
;
4250 symdefend
= symdef
+ c
;
4251 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
4253 struct elf_link_hash_entry
*h
;
4255 struct bfd_link_hash_entry
*undefs_tail
;
4258 if (defined
[i
] || included
[i
])
4260 if (symdef
->file_offset
== last
)
4266 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
4267 FALSE
, FALSE
, FALSE
);
4274 /* If this is a default version (the name contains @@),
4275 look up the symbol again with only one `@' as well
4276 as without the version. The effect is that references
4277 to the symbol with and without the version will be
4278 matched by the default symbol in the archive. */
4280 p
= strchr (symdef
->name
, ELF_VER_CHR
);
4281 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4284 /* First check with only one `@'. */
4285 len
= strlen (symdef
->name
);
4286 copy
= bfd_alloc (abfd
, len
);
4289 first
= p
- symdef
->name
+ 1;
4290 memcpy (copy
, symdef
->name
, first
);
4291 memcpy (copy
+ first
, symdef
->name
+ first
+ 1, len
- first
);
4293 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4294 FALSE
, FALSE
, FALSE
);
4298 /* We also need to check references to the symbol
4299 without the version. */
4301 copy
[first
- 1] = '\0';
4302 h
= elf_link_hash_lookup (elf_hash_table (info
),
4303 copy
, FALSE
, FALSE
, FALSE
);
4306 bfd_release (abfd
, copy
);
4312 if (h
->root
.type
== bfd_link_hash_common
)
4314 /* We currently have a common symbol. The archive map contains
4315 a reference to this symbol, so we may want to include it. We
4316 only want to include it however, if this archive element
4317 contains a definition of the symbol, not just another common
4320 Unfortunately some archivers (including GNU ar) will put
4321 declarations of common symbols into their archive maps, as
4322 well as real definitions, so we cannot just go by the archive
4323 map alone. Instead we must read in the element's symbol
4324 table and check that to see what kind of symbol definition
4326 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
4329 else if (h
->root
.type
!= bfd_link_hash_undefined
)
4331 if (h
->root
.type
!= bfd_link_hash_undefweak
)
4336 /* We need to include this archive member. */
4337 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
4338 if (element
== NULL
)
4341 if (! bfd_check_format (element
, bfd_object
))
4344 /* Doublecheck that we have not included this object
4345 already--it should be impossible, but there may be
4346 something wrong with the archive. */
4347 if (element
->archive_pass
!= 0)
4349 bfd_set_error (bfd_error_bad_value
);
4352 element
->archive_pass
= 1;
4354 undefs_tail
= info
->hash
->undefs_tail
;
4356 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
4359 if (! bfd_link_add_symbols (element
, info
))
4362 /* If there are any new undefined symbols, we need to make
4363 another pass through the archive in order to see whether
4364 they can be defined. FIXME: This isn't perfect, because
4365 common symbols wind up on undefs_tail and because an
4366 undefined symbol which is defined later on in this pass
4367 does not require another pass. This isn't a bug, but it
4368 does make the code less efficient than it could be. */
4369 if (undefs_tail
!= info
->hash
->undefs_tail
)
4372 /* Look backward to mark all symbols from this object file
4373 which we have already seen in this pass. */
4377 included
[mark
] = TRUE
;
4382 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
4384 /* We mark subsequent symbols from this object file as we go
4385 on through the loop. */
4386 last
= symdef
->file_offset
;
4397 if (defined
!= NULL
)
4399 if (included
!= NULL
)
4404 /* Given an ELF BFD, add symbols to the global hash table as
4408 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4410 switch (bfd_get_format (abfd
))
4413 return elf_link_add_object_symbols (abfd
, info
);
4415 return elf_link_add_archive_symbols (abfd
, info
);
4417 bfd_set_error (bfd_error_wrong_format
);
4422 /* This function will be called though elf_link_hash_traverse to store
4423 all hash value of the exported symbols in an array. */
4426 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
4428 unsigned long **valuep
= data
;
4434 if (h
->root
.type
== bfd_link_hash_warning
)
4435 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4437 /* Ignore indirect symbols. These are added by the versioning code. */
4438 if (h
->dynindx
== -1)
4441 name
= h
->root
.root
.string
;
4442 p
= strchr (name
, ELF_VER_CHR
);
4445 alc
= bfd_malloc (p
- name
+ 1);
4446 memcpy (alc
, name
, p
- name
);
4447 alc
[p
- name
] = '\0';
4451 /* Compute the hash value. */
4452 ha
= bfd_elf_hash (name
);
4454 /* Store the found hash value in the array given as the argument. */
4457 /* And store it in the struct so that we can put it in the hash table
4459 h
->elf_hash_value
= ha
;
4467 /* Array used to determine the number of hash table buckets to use
4468 based on the number of symbols there are. If there are fewer than
4469 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
4470 fewer than 37 we use 17 buckets, and so forth. We never use more
4471 than 32771 buckets. */
4473 static const size_t elf_buckets
[] =
4475 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
4479 /* Compute bucket count for hashing table. We do not use a static set
4480 of possible tables sizes anymore. Instead we determine for all
4481 possible reasonable sizes of the table the outcome (i.e., the
4482 number of collisions etc) and choose the best solution. The
4483 weighting functions are not too simple to allow the table to grow
4484 without bounds. Instead one of the weighting factors is the size.
4485 Therefore the result is always a good payoff between few collisions
4486 (= short chain lengths) and table size. */
4488 compute_bucket_count (struct bfd_link_info
*info
)
4490 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
4491 size_t best_size
= 0;
4492 unsigned long int *hashcodes
;
4493 unsigned long int *hashcodesp
;
4494 unsigned long int i
;
4497 /* Compute the hash values for all exported symbols. At the same
4498 time store the values in an array so that we could use them for
4501 amt
*= sizeof (unsigned long int);
4502 hashcodes
= bfd_malloc (amt
);
4503 if (hashcodes
== NULL
)
4505 hashcodesp
= hashcodes
;
4507 /* Put all hash values in HASHCODES. */
4508 elf_link_hash_traverse (elf_hash_table (info
),
4509 elf_collect_hash_codes
, &hashcodesp
);
4511 /* We have a problem here. The following code to optimize the table
4512 size requires an integer type with more the 32 bits. If
4513 BFD_HOST_U_64_BIT is set we know about such a type. */
4514 #ifdef BFD_HOST_U_64_BIT
4517 unsigned long int nsyms
= hashcodesp
- hashcodes
;
4520 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
4521 unsigned long int *counts
;
4522 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4523 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
4525 /* Possible optimization parameters: if we have NSYMS symbols we say
4526 that the hashing table must at least have NSYMS/4 and at most
4528 minsize
= nsyms
/ 4;
4531 best_size
= maxsize
= nsyms
* 2;
4533 /* Create array where we count the collisions in. We must use bfd_malloc
4534 since the size could be large. */
4536 amt
*= sizeof (unsigned long int);
4537 counts
= bfd_malloc (amt
);
4544 /* Compute the "optimal" size for the hash table. The criteria is a
4545 minimal chain length. The minor criteria is (of course) the size
4547 for (i
= minsize
; i
< maxsize
; ++i
)
4549 /* Walk through the array of hashcodes and count the collisions. */
4550 BFD_HOST_U_64_BIT max
;
4551 unsigned long int j
;
4552 unsigned long int fact
;
4554 memset (counts
, '\0', i
* sizeof (unsigned long int));
4556 /* Determine how often each hash bucket is used. */
4557 for (j
= 0; j
< nsyms
; ++j
)
4558 ++counts
[hashcodes
[j
] % i
];
4560 /* For the weight function we need some information about the
4561 pagesize on the target. This is information need not be 100%
4562 accurate. Since this information is not available (so far) we
4563 define it here to a reasonable default value. If it is crucial
4564 to have a better value some day simply define this value. */
4565 # ifndef BFD_TARGET_PAGESIZE
4566 # define BFD_TARGET_PAGESIZE (4096)
4569 /* We in any case need 2 + NSYMS entries for the size values and
4571 max
= (2 + nsyms
) * (bed
->s
->arch_size
/ 8);
4574 /* Variant 1: optimize for short chains. We add the squares
4575 of all the chain lengths (which favors many small chain
4576 over a few long chains). */
4577 for (j
= 0; j
< i
; ++j
)
4578 max
+= counts
[j
] * counts
[j
];
4580 /* This adds penalties for the overall size of the table. */
4581 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4584 /* Variant 2: Optimize a lot more for small table. Here we
4585 also add squares of the size but we also add penalties for
4586 empty slots (the +1 term). */
4587 for (j
= 0; j
< i
; ++j
)
4588 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
4590 /* The overall size of the table is considered, but not as
4591 strong as in variant 1, where it is squared. */
4592 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4596 /* Compare with current best results. */
4597 if (max
< best_chlen
)
4607 #endif /* defined (BFD_HOST_U_64_BIT) */
4609 /* This is the fallback solution if no 64bit type is available or if we
4610 are not supposed to spend much time on optimizations. We select the
4611 bucket count using a fixed set of numbers. */
4612 for (i
= 0; elf_buckets
[i
] != 0; i
++)
4614 best_size
= elf_buckets
[i
];
4615 if (dynsymcount
< elf_buckets
[i
+ 1])
4620 /* Free the arrays we needed. */
4626 /* Set up the sizes and contents of the ELF dynamic sections. This is
4627 called by the ELF linker emulation before_allocation routine. We
4628 must set the sizes of the sections before the linker sets the
4629 addresses of the various sections. */
4632 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
4635 const char *filter_shlib
,
4636 const char * const *auxiliary_filters
,
4637 struct bfd_link_info
*info
,
4638 asection
**sinterpptr
,
4639 struct bfd_elf_version_tree
*verdefs
)
4641 bfd_size_type soname_indx
;
4643 const struct elf_backend_data
*bed
;
4644 struct elf_assign_sym_version_info asvinfo
;
4648 soname_indx
= (bfd_size_type
) -1;
4650 if (!is_elf_hash_table (info
->hash
))
4653 elf_tdata (output_bfd
)->relro
= info
->relro
;
4654 if (info
->execstack
)
4655 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
4656 else if (info
->noexecstack
)
4657 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
4661 asection
*notesec
= NULL
;
4664 for (inputobj
= info
->input_bfds
;
4666 inputobj
= inputobj
->link_next
)
4670 if (inputobj
->flags
& DYNAMIC
)
4672 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
4675 if (s
->flags
& SEC_CODE
)
4684 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
4685 if (exec
&& info
->relocatable
4686 && notesec
->output_section
!= bfd_abs_section_ptr
)
4687 notesec
->output_section
->flags
|= SEC_CODE
;
4691 /* Any syms created from now on start with -1 in
4692 got.refcount/offset and plt.refcount/offset. */
4693 elf_hash_table (info
)->init_refcount
= elf_hash_table (info
)->init_offset
;
4695 /* The backend may have to create some sections regardless of whether
4696 we're dynamic or not. */
4697 bed
= get_elf_backend_data (output_bfd
);
4698 if (bed
->elf_backend_always_size_sections
4699 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
4702 dynobj
= elf_hash_table (info
)->dynobj
;
4704 /* If there were no dynamic objects in the link, there is nothing to
4709 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
4712 if (elf_hash_table (info
)->dynamic_sections_created
)
4714 struct elf_info_failed eif
;
4715 struct elf_link_hash_entry
*h
;
4717 struct bfd_elf_version_tree
*t
;
4718 struct bfd_elf_version_expr
*d
;
4719 bfd_boolean all_defined
;
4721 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
4722 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
4726 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4728 if (soname_indx
== (bfd_size_type
) -1
4729 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
4735 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
4737 info
->flags
|= DF_SYMBOLIC
;
4744 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
4746 if (indx
== (bfd_size_type
) -1
4747 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
4750 if (info
->new_dtags
)
4752 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
4753 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
4758 if (filter_shlib
!= NULL
)
4762 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4763 filter_shlib
, TRUE
);
4764 if (indx
== (bfd_size_type
) -1
4765 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
4769 if (auxiliary_filters
!= NULL
)
4771 const char * const *p
;
4773 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
4777 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4779 if (indx
== (bfd_size_type
) -1
4780 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
4786 eif
.verdefs
= verdefs
;
4789 /* If we are supposed to export all symbols into the dynamic symbol
4790 table (this is not the normal case), then do so. */
4791 if (info
->export_dynamic
)
4793 elf_link_hash_traverse (elf_hash_table (info
),
4794 _bfd_elf_export_symbol
,
4800 /* Make all global versions with definition. */
4801 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
4802 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
4803 if (!d
->symver
&& d
->symbol
)
4805 const char *verstr
, *name
;
4806 size_t namelen
, verlen
, newlen
;
4808 struct elf_link_hash_entry
*newh
;
4811 namelen
= strlen (name
);
4813 verlen
= strlen (verstr
);
4814 newlen
= namelen
+ verlen
+ 3;
4816 newname
= bfd_malloc (newlen
);
4817 if (newname
== NULL
)
4819 memcpy (newname
, name
, namelen
);
4821 /* Check the hidden versioned definition. */
4822 p
= newname
+ namelen
;
4824 memcpy (p
, verstr
, verlen
+ 1);
4825 newh
= elf_link_hash_lookup (elf_hash_table (info
),
4826 newname
, FALSE
, FALSE
,
4829 || (newh
->root
.type
!= bfd_link_hash_defined
4830 && newh
->root
.type
!= bfd_link_hash_defweak
))
4832 /* Check the default versioned definition. */
4834 memcpy (p
, verstr
, verlen
+ 1);
4835 newh
= elf_link_hash_lookup (elf_hash_table (info
),
4836 newname
, FALSE
, FALSE
,
4841 /* Mark this version if there is a definition and it is
4842 not defined in a shared object. */
4844 && ((newh
->elf_link_hash_flags
4845 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)
4846 && (newh
->root
.type
== bfd_link_hash_defined
4847 || newh
->root
.type
== bfd_link_hash_defweak
))
4851 /* Attach all the symbols to their version information. */
4852 asvinfo
.output_bfd
= output_bfd
;
4853 asvinfo
.info
= info
;
4854 asvinfo
.verdefs
= verdefs
;
4855 asvinfo
.failed
= FALSE
;
4857 elf_link_hash_traverse (elf_hash_table (info
),
4858 _bfd_elf_link_assign_sym_version
,
4863 if (!info
->allow_undefined_version
)
4865 /* Check if all global versions have a definition. */
4867 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
4868 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
4869 if (!d
->symver
&& !d
->script
)
4871 (*_bfd_error_handler
)
4872 (_("%s: undefined version: %s"),
4873 d
->pattern
, t
->name
);
4874 all_defined
= FALSE
;
4879 bfd_set_error (bfd_error_bad_value
);
4884 /* Find all symbols which were defined in a dynamic object and make
4885 the backend pick a reasonable value for them. */
4886 elf_link_hash_traverse (elf_hash_table (info
),
4887 _bfd_elf_adjust_dynamic_symbol
,
4892 /* Add some entries to the .dynamic section. We fill in some of the
4893 values later, in elf_bfd_final_link, but we must add the entries
4894 now so that we know the final size of the .dynamic section. */
4896 /* If there are initialization and/or finalization functions to
4897 call then add the corresponding DT_INIT/DT_FINI entries. */
4898 h
= (info
->init_function
4899 ? elf_link_hash_lookup (elf_hash_table (info
),
4900 info
->init_function
, FALSE
,
4904 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
4905 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
4907 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
4910 h
= (info
->fini_function
4911 ? elf_link_hash_lookup (elf_hash_table (info
),
4912 info
->fini_function
, FALSE
,
4916 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
4917 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
4919 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
4923 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
4925 /* DT_PREINIT_ARRAY is not allowed in shared library. */
4926 if (! info
->executable
)
4931 for (sub
= info
->input_bfds
; sub
!= NULL
;
4932 sub
= sub
->link_next
)
4933 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4934 if (elf_section_data (o
)->this_hdr
.sh_type
4935 == SHT_PREINIT_ARRAY
)
4937 (*_bfd_error_handler
)
4938 (_("%s: .preinit_array section is not allowed in DSO"),
4939 bfd_archive_filename (sub
));
4943 bfd_set_error (bfd_error_nonrepresentable_section
);
4947 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
4948 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
4951 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
4953 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
4954 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
4957 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
4959 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
4960 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
4964 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
4965 /* If .dynstr is excluded from the link, we don't want any of
4966 these tags. Strictly, we should be checking each section
4967 individually; This quick check covers for the case where
4968 someone does a /DISCARD/ : { *(*) }. */
4969 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
4971 bfd_size_type strsize
;
4973 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
4974 if (!_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0)
4975 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
4976 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
4977 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
4978 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
4979 bed
->s
->sizeof_sym
))
4984 /* The backend must work out the sizes of all the other dynamic
4986 if (bed
->elf_backend_size_dynamic_sections
4987 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
4990 if (elf_hash_table (info
)->dynamic_sections_created
)
4992 bfd_size_type dynsymcount
;
4994 size_t bucketcount
= 0;
4995 size_t hash_entry_size
;
4996 unsigned int dtagcount
;
4998 /* Set up the version definition section. */
4999 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5000 BFD_ASSERT (s
!= NULL
);
5002 /* We may have created additional version definitions if we are
5003 just linking a regular application. */
5004 verdefs
= asvinfo
.verdefs
;
5006 /* Skip anonymous version tag. */
5007 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5008 verdefs
= verdefs
->next
;
5010 if (verdefs
== NULL
)
5011 _bfd_strip_section_from_output (info
, s
);
5016 struct bfd_elf_version_tree
*t
;
5018 Elf_Internal_Verdef def
;
5019 Elf_Internal_Verdaux defaux
;
5024 /* Make space for the base version. */
5025 size
+= sizeof (Elf_External_Verdef
);
5026 size
+= sizeof (Elf_External_Verdaux
);
5029 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5031 struct bfd_elf_version_deps
*n
;
5033 size
+= sizeof (Elf_External_Verdef
);
5034 size
+= sizeof (Elf_External_Verdaux
);
5037 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5038 size
+= sizeof (Elf_External_Verdaux
);
5042 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5043 if (s
->contents
== NULL
&& s
->size
!= 0)
5046 /* Fill in the version definition section. */
5050 def
.vd_version
= VER_DEF_CURRENT
;
5051 def
.vd_flags
= VER_FLG_BASE
;
5054 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5055 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5056 + sizeof (Elf_External_Verdaux
));
5058 if (soname_indx
!= (bfd_size_type
) -1)
5060 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5062 def
.vd_hash
= bfd_elf_hash (soname
);
5063 defaux
.vda_name
= soname_indx
;
5070 name
= basename (output_bfd
->filename
);
5071 def
.vd_hash
= bfd_elf_hash (name
);
5072 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5074 if (indx
== (bfd_size_type
) -1)
5076 defaux
.vda_name
= indx
;
5078 defaux
.vda_next
= 0;
5080 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5081 (Elf_External_Verdef
*) p
);
5082 p
+= sizeof (Elf_External_Verdef
);
5083 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5084 (Elf_External_Verdaux
*) p
);
5085 p
+= sizeof (Elf_External_Verdaux
);
5087 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5090 struct bfd_elf_version_deps
*n
;
5091 struct elf_link_hash_entry
*h
;
5092 struct bfd_link_hash_entry
*bh
;
5095 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5098 /* Add a symbol representing this version. */
5100 if (! (_bfd_generic_link_add_one_symbol
5101 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5103 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5105 h
= (struct elf_link_hash_entry
*) bh
;
5106 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
5107 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
5108 h
->type
= STT_OBJECT
;
5109 h
->verinfo
.vertree
= t
;
5111 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5114 def
.vd_version
= VER_DEF_CURRENT
;
5116 if (t
->globals
.list
== NULL
5117 && t
->locals
.list
== NULL
5119 def
.vd_flags
|= VER_FLG_WEAK
;
5120 def
.vd_ndx
= t
->vernum
+ 1;
5121 def
.vd_cnt
= cdeps
+ 1;
5122 def
.vd_hash
= bfd_elf_hash (t
->name
);
5123 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5125 if (t
->next
!= NULL
)
5126 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5127 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
5129 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5130 (Elf_External_Verdef
*) p
);
5131 p
+= sizeof (Elf_External_Verdef
);
5133 defaux
.vda_name
= h
->dynstr_index
;
5134 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5136 defaux
.vda_next
= 0;
5137 if (t
->deps
!= NULL
)
5138 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5139 t
->name_indx
= defaux
.vda_name
;
5141 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5142 (Elf_External_Verdaux
*) p
);
5143 p
+= sizeof (Elf_External_Verdaux
);
5145 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5147 if (n
->version_needed
== NULL
)
5149 /* This can happen if there was an error in the
5151 defaux
.vda_name
= 0;
5155 defaux
.vda_name
= n
->version_needed
->name_indx
;
5156 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5159 if (n
->next
== NULL
)
5160 defaux
.vda_next
= 0;
5162 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5164 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5165 (Elf_External_Verdaux
*) p
);
5166 p
+= sizeof (Elf_External_Verdaux
);
5170 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
5171 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
5174 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
5177 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
5179 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
5182 else if (info
->flags
& DF_BIND_NOW
)
5184 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
5190 if (info
->executable
)
5191 info
->flags_1
&= ~ (DF_1_INITFIRST
5194 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
5198 /* Work out the size of the version reference section. */
5200 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
5201 BFD_ASSERT (s
!= NULL
);
5203 struct elf_find_verdep_info sinfo
;
5205 sinfo
.output_bfd
= output_bfd
;
5207 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
5208 if (sinfo
.vers
== 0)
5210 sinfo
.failed
= FALSE
;
5212 elf_link_hash_traverse (elf_hash_table (info
),
5213 _bfd_elf_link_find_version_dependencies
,
5216 if (elf_tdata (output_bfd
)->verref
== NULL
)
5217 _bfd_strip_section_from_output (info
, s
);
5220 Elf_Internal_Verneed
*t
;
5225 /* Build the version definition section. */
5228 for (t
= elf_tdata (output_bfd
)->verref
;
5232 Elf_Internal_Vernaux
*a
;
5234 size
+= sizeof (Elf_External_Verneed
);
5236 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5237 size
+= sizeof (Elf_External_Vernaux
);
5241 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5242 if (s
->contents
== NULL
)
5246 for (t
= elf_tdata (output_bfd
)->verref
;
5251 Elf_Internal_Vernaux
*a
;
5255 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5258 t
->vn_version
= VER_NEED_CURRENT
;
5260 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5261 elf_dt_name (t
->vn_bfd
) != NULL
5262 ? elf_dt_name (t
->vn_bfd
)
5263 : basename (t
->vn_bfd
->filename
),
5265 if (indx
== (bfd_size_type
) -1)
5268 t
->vn_aux
= sizeof (Elf_External_Verneed
);
5269 if (t
->vn_nextref
== NULL
)
5272 t
->vn_next
= (sizeof (Elf_External_Verneed
)
5273 + caux
* sizeof (Elf_External_Vernaux
));
5275 _bfd_elf_swap_verneed_out (output_bfd
, t
,
5276 (Elf_External_Verneed
*) p
);
5277 p
+= sizeof (Elf_External_Verneed
);
5279 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5281 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
5282 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5283 a
->vna_nodename
, FALSE
);
5284 if (indx
== (bfd_size_type
) -1)
5287 if (a
->vna_nextptr
== NULL
)
5290 a
->vna_next
= sizeof (Elf_External_Vernaux
);
5292 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
5293 (Elf_External_Vernaux
*) p
);
5294 p
+= sizeof (Elf_External_Vernaux
);
5298 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
5299 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
5302 elf_tdata (output_bfd
)->cverrefs
= crefs
;
5306 /* Assign dynsym indicies. In a shared library we generate a
5307 section symbol for each output section, which come first.
5308 Next come all of the back-end allocated local dynamic syms,
5309 followed by the rest of the global symbols. */
5311 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5313 /* Work out the size of the symbol version section. */
5314 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
5315 BFD_ASSERT (s
!= NULL
);
5316 if (dynsymcount
== 0
5317 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
5319 _bfd_strip_section_from_output (info
, s
);
5320 /* The DYNSYMCOUNT might have changed if we were going to
5321 output a dynamic symbol table entry for S. */
5322 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5326 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
5327 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
5328 if (s
->contents
== NULL
)
5331 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
5335 /* Set the size of the .dynsym and .hash sections. We counted
5336 the number of dynamic symbols in elf_link_add_object_symbols.
5337 We will build the contents of .dynsym and .hash when we build
5338 the final symbol table, because until then we do not know the
5339 correct value to give the symbols. We built the .dynstr
5340 section as we went along in elf_link_add_object_symbols. */
5341 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
5342 BFD_ASSERT (s
!= NULL
);
5343 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
5344 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5345 if (s
->contents
== NULL
&& s
->size
!= 0)
5348 if (dynsymcount
!= 0)
5350 Elf_Internal_Sym isym
;
5352 /* The first entry in .dynsym is a dummy symbol. */
5359 bed
->s
->swap_symbol_out (output_bfd
, &isym
, s
->contents
, 0);
5362 /* Compute the size of the hashing table. As a side effect this
5363 computes the hash values for all the names we export. */
5364 bucketcount
= compute_bucket_count (info
);
5366 s
= bfd_get_section_by_name (dynobj
, ".hash");
5367 BFD_ASSERT (s
!= NULL
);
5368 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
5369 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
5370 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
5371 if (s
->contents
== NULL
)
5374 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
5375 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
5376 s
->contents
+ hash_entry_size
);
5378 elf_hash_table (info
)->bucketcount
= bucketcount
;
5380 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
5381 BFD_ASSERT (s
!= NULL
);
5383 elf_finalize_dynstr (output_bfd
, info
);
5385 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5387 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
5388 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
5395 /* Final phase of ELF linker. */
5397 /* A structure we use to avoid passing large numbers of arguments. */
5399 struct elf_final_link_info
5401 /* General link information. */
5402 struct bfd_link_info
*info
;
5405 /* Symbol string table. */
5406 struct bfd_strtab_hash
*symstrtab
;
5407 /* .dynsym section. */
5408 asection
*dynsym_sec
;
5409 /* .hash section. */
5411 /* symbol version section (.gnu.version). */
5412 asection
*symver_sec
;
5413 /* Buffer large enough to hold contents of any section. */
5415 /* Buffer large enough to hold external relocs of any section. */
5416 void *external_relocs
;
5417 /* Buffer large enough to hold internal relocs of any section. */
5418 Elf_Internal_Rela
*internal_relocs
;
5419 /* Buffer large enough to hold external local symbols of any input
5421 bfd_byte
*external_syms
;
5422 /* And a buffer for symbol section indices. */
5423 Elf_External_Sym_Shndx
*locsym_shndx
;
5424 /* Buffer large enough to hold internal local symbols of any input
5426 Elf_Internal_Sym
*internal_syms
;
5427 /* Array large enough to hold a symbol index for each local symbol
5428 of any input BFD. */
5430 /* Array large enough to hold a section pointer for each local
5431 symbol of any input BFD. */
5432 asection
**sections
;
5433 /* Buffer to hold swapped out symbols. */
5435 /* And one for symbol section indices. */
5436 Elf_External_Sym_Shndx
*symshndxbuf
;
5437 /* Number of swapped out symbols in buffer. */
5438 size_t symbuf_count
;
5439 /* Number of symbols which fit in symbuf. */
5441 /* And same for symshndxbuf. */
5442 size_t shndxbuf_size
;
5445 /* This struct is used to pass information to elf_link_output_extsym. */
5447 struct elf_outext_info
5450 bfd_boolean localsyms
;
5451 struct elf_final_link_info
*finfo
;
5454 /* When performing a relocatable link, the input relocations are
5455 preserved. But, if they reference global symbols, the indices
5456 referenced must be updated. Update all the relocations in
5457 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
5460 elf_link_adjust_relocs (bfd
*abfd
,
5461 Elf_Internal_Shdr
*rel_hdr
,
5463 struct elf_link_hash_entry
**rel_hash
)
5466 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5468 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5469 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5470 bfd_vma r_type_mask
;
5473 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
5475 swap_in
= bed
->s
->swap_reloc_in
;
5476 swap_out
= bed
->s
->swap_reloc_out
;
5478 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
5480 swap_in
= bed
->s
->swap_reloca_in
;
5481 swap_out
= bed
->s
->swap_reloca_out
;
5486 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
5489 if (bed
->s
->arch_size
== 32)
5496 r_type_mask
= 0xffffffff;
5500 erela
= rel_hdr
->contents
;
5501 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
5503 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
5506 if (*rel_hash
== NULL
)
5509 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
5511 (*swap_in
) (abfd
, erela
, irela
);
5512 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
5513 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
5514 | (irela
[j
].r_info
& r_type_mask
));
5515 (*swap_out
) (abfd
, irela
, erela
);
5519 struct elf_link_sort_rela
5525 enum elf_reloc_type_class type
;
5526 /* We use this as an array of size int_rels_per_ext_rel. */
5527 Elf_Internal_Rela rela
[1];
5531 elf_link_sort_cmp1 (const void *A
, const void *B
)
5533 const struct elf_link_sort_rela
*a
= A
;
5534 const struct elf_link_sort_rela
*b
= B
;
5535 int relativea
, relativeb
;
5537 relativea
= a
->type
== reloc_class_relative
;
5538 relativeb
= b
->type
== reloc_class_relative
;
5540 if (relativea
< relativeb
)
5542 if (relativea
> relativeb
)
5544 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
5546 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
5548 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5550 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5556 elf_link_sort_cmp2 (const void *A
, const void *B
)
5558 const struct elf_link_sort_rela
*a
= A
;
5559 const struct elf_link_sort_rela
*b
= B
;
5562 if (a
->u
.offset
< b
->u
.offset
)
5564 if (a
->u
.offset
> b
->u
.offset
)
5566 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
5567 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
5572 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5574 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5580 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
5583 bfd_size_type count
, size
;
5584 size_t i
, ret
, sort_elt
, ext_size
;
5585 bfd_byte
*sort
, *s_non_relative
, *p
;
5586 struct elf_link_sort_rela
*sq
;
5587 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5588 int i2e
= bed
->s
->int_rels_per_ext_rel
;
5589 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5590 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5591 struct bfd_link_order
*lo
;
5594 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
5595 if (reldyn
== NULL
|| reldyn
->size
== 0)
5597 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
5598 if (reldyn
== NULL
|| reldyn
->size
== 0)
5600 ext_size
= bed
->s
->sizeof_rel
;
5601 swap_in
= bed
->s
->swap_reloc_in
;
5602 swap_out
= bed
->s
->swap_reloc_out
;
5606 ext_size
= bed
->s
->sizeof_rela
;
5607 swap_in
= bed
->s
->swap_reloca_in
;
5608 swap_out
= bed
->s
->swap_reloca_out
;
5610 count
= reldyn
->size
/ ext_size
;
5613 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5614 if (lo
->type
== bfd_indirect_link_order
)
5616 asection
*o
= lo
->u
.indirect
.section
;
5620 if (size
!= reldyn
->size
)
5623 sort_elt
= (sizeof (struct elf_link_sort_rela
)
5624 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
5625 sort
= bfd_zmalloc (sort_elt
* count
);
5628 (*info
->callbacks
->warning
)
5629 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
5633 if (bed
->s
->arch_size
== 32)
5634 r_sym_mask
= ~(bfd_vma
) 0xff;
5636 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
5638 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5639 if (lo
->type
== bfd_indirect_link_order
)
5641 bfd_byte
*erel
, *erelend
;
5642 asection
*o
= lo
->u
.indirect
.section
;
5645 erelend
= o
->contents
+ o
->size
;
5646 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5647 while (erel
< erelend
)
5649 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5650 (*swap_in
) (abfd
, erel
, s
->rela
);
5651 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
5652 s
->u
.sym_mask
= r_sym_mask
;
5658 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
5660 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
5662 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5663 if (s
->type
!= reloc_class_relative
)
5669 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
5670 for (; i
< count
; i
++, p
+= sort_elt
)
5672 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
5673 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
5675 sp
->u
.offset
= sq
->rela
->r_offset
;
5678 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
5680 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5681 if (lo
->type
== bfd_indirect_link_order
)
5683 bfd_byte
*erel
, *erelend
;
5684 asection
*o
= lo
->u
.indirect
.section
;
5687 erelend
= o
->contents
+ o
->size
;
5688 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5689 while (erel
< erelend
)
5691 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5692 (*swap_out
) (abfd
, s
->rela
, erel
);
5703 /* Flush the output symbols to the file. */
5706 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
5707 const struct elf_backend_data
*bed
)
5709 if (finfo
->symbuf_count
> 0)
5711 Elf_Internal_Shdr
*hdr
;
5715 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5716 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5717 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
5718 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5719 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5722 hdr
->sh_size
+= amt
;
5723 finfo
->symbuf_count
= 0;
5729 /* Add a symbol to the output symbol table. */
5732 elf_link_output_sym (struct elf_final_link_info
*finfo
,
5734 Elf_Internal_Sym
*elfsym
,
5735 asection
*input_sec
,
5736 struct elf_link_hash_entry
*h
)
5739 Elf_External_Sym_Shndx
*destshndx
;
5740 bfd_boolean (*output_symbol_hook
)
5741 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
5742 struct elf_link_hash_entry
*);
5743 const struct elf_backend_data
*bed
;
5745 bed
= get_elf_backend_data (finfo
->output_bfd
);
5746 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
5747 if (output_symbol_hook
!= NULL
)
5749 if (! (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
))
5753 if (name
== NULL
|| *name
== '\0')
5754 elfsym
->st_name
= 0;
5755 else if (input_sec
->flags
& SEC_EXCLUDE
)
5756 elfsym
->st_name
= 0;
5759 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5761 if (elfsym
->st_name
== (unsigned long) -1)
5765 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5767 if (! elf_link_flush_output_syms (finfo
, bed
))
5771 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
5772 destshndx
= finfo
->symshndxbuf
;
5773 if (destshndx
!= NULL
)
5775 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
5779 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
5780 finfo
->symshndxbuf
= destshndx
= bfd_realloc (destshndx
, amt
* 2);
5781 if (destshndx
== NULL
)
5783 memset ((char *) destshndx
+ amt
, 0, amt
);
5784 finfo
->shndxbuf_size
*= 2;
5786 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
5789 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
5790 finfo
->symbuf_count
+= 1;
5791 bfd_get_symcount (finfo
->output_bfd
) += 1;
5796 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
5797 allowing an unsatisfied unversioned symbol in the DSO to match a
5798 versioned symbol that would normally require an explicit version.
5799 We also handle the case that a DSO references a hidden symbol
5800 which may be satisfied by a versioned symbol in another DSO. */
5803 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
5804 const struct elf_backend_data
*bed
,
5805 struct elf_link_hash_entry
*h
)
5808 struct elf_link_loaded_list
*loaded
;
5810 if (!is_elf_hash_table (info
->hash
))
5813 switch (h
->root
.type
)
5819 case bfd_link_hash_undefined
:
5820 case bfd_link_hash_undefweak
:
5821 abfd
= h
->root
.u
.undef
.abfd
;
5822 if ((abfd
->flags
& DYNAMIC
) == 0
5823 || elf_dyn_lib_class (abfd
) != DYN_DT_NEEDED
)
5827 case bfd_link_hash_defined
:
5828 case bfd_link_hash_defweak
:
5829 abfd
= h
->root
.u
.def
.section
->owner
;
5832 case bfd_link_hash_common
:
5833 abfd
= h
->root
.u
.c
.p
->section
->owner
;
5836 BFD_ASSERT (abfd
!= NULL
);
5838 for (loaded
= elf_hash_table (info
)->loaded
;
5840 loaded
= loaded
->next
)
5843 Elf_Internal_Shdr
*hdr
;
5844 bfd_size_type symcount
;
5845 bfd_size_type extsymcount
;
5846 bfd_size_type extsymoff
;
5847 Elf_Internal_Shdr
*versymhdr
;
5848 Elf_Internal_Sym
*isym
;
5849 Elf_Internal_Sym
*isymend
;
5850 Elf_Internal_Sym
*isymbuf
;
5851 Elf_External_Versym
*ever
;
5852 Elf_External_Versym
*extversym
;
5854 input
= loaded
->abfd
;
5856 /* We check each DSO for a possible hidden versioned definition. */
5858 || (input
->flags
& DYNAMIC
) == 0
5859 || elf_dynversym (input
) == 0)
5862 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
5864 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
5865 if (elf_bad_symtab (input
))
5867 extsymcount
= symcount
;
5872 extsymcount
= symcount
- hdr
->sh_info
;
5873 extsymoff
= hdr
->sh_info
;
5876 if (extsymcount
== 0)
5879 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
5881 if (isymbuf
== NULL
)
5884 /* Read in any version definitions. */
5885 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
5886 extversym
= bfd_malloc (versymhdr
->sh_size
);
5887 if (extversym
== NULL
)
5890 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
5891 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
5892 != versymhdr
->sh_size
))
5900 ever
= extversym
+ extsymoff
;
5901 isymend
= isymbuf
+ extsymcount
;
5902 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
5905 Elf_Internal_Versym iver
;
5906 unsigned short version_index
;
5908 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
5909 || isym
->st_shndx
== SHN_UNDEF
)
5912 name
= bfd_elf_string_from_elf_section (input
,
5915 if (strcmp (name
, h
->root
.root
.string
) != 0)
5918 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
5920 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
5922 /* If we have a non-hidden versioned sym, then it should
5923 have provided a definition for the undefined sym. */
5927 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
5928 if (version_index
== 1 || version_index
== 2)
5930 /* This is the base or first version. We can use it. */
5944 /* Add an external symbol to the symbol table. This is called from
5945 the hash table traversal routine. When generating a shared object,
5946 we go through the symbol table twice. The first time we output
5947 anything that might have been forced to local scope in a version
5948 script. The second time we output the symbols that are still
5952 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
5954 struct elf_outext_info
*eoinfo
= data
;
5955 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5957 Elf_Internal_Sym sym
;
5958 asection
*input_sec
;
5959 const struct elf_backend_data
*bed
;
5961 if (h
->root
.type
== bfd_link_hash_warning
)
5963 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5964 if (h
->root
.type
== bfd_link_hash_new
)
5968 /* Decide whether to output this symbol in this pass. */
5969 if (eoinfo
->localsyms
)
5971 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5976 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5980 bed
= get_elf_backend_data (finfo
->output_bfd
);
5982 /* If we have an undefined symbol reference here then it must have
5983 come from a shared library that is being linked in. (Undefined
5984 references in regular files have already been handled). If we
5985 are reporting errors for this situation then do so now. */
5986 if (h
->root
.type
== bfd_link_hash_undefined
5987 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5988 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
5989 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
5990 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
5992 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5993 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5994 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
5996 eoinfo
->failed
= TRUE
;
6001 /* We should also warn if a forced local symbol is referenced from
6002 shared libraries. */
6003 if (! finfo
->info
->relocatable
6004 && (! finfo
->info
->shared
)
6005 && (h
->elf_link_hash_flags
6006 & (ELF_LINK_FORCED_LOCAL
| ELF_LINK_HASH_REF_DYNAMIC
| ELF_LINK_DYNAMIC_DEF
| ELF_LINK_DYNAMIC_WEAK
))
6007 == (ELF_LINK_FORCED_LOCAL
| ELF_LINK_HASH_REF_DYNAMIC
)
6008 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
6010 (*_bfd_error_handler
)
6011 (_("%s: %s symbol `%s' in %s is referenced by DSO"),
6012 bfd_get_filename (finfo
->output_bfd
),
6013 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
6015 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
6016 ? "hidden" : "local",
6017 h
->root
.root
.string
,
6018 bfd_archive_filename (h
->root
.u
.def
.section
->owner
));
6019 eoinfo
->failed
= TRUE
;
6023 /* We don't want to output symbols that have never been mentioned by
6024 a regular file, or that we have been told to strip. However, if
6025 h->indx is set to -2, the symbol is used by a reloc and we must
6029 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
6030 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
6031 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
6032 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
6034 else if (finfo
->info
->strip
== strip_all
)
6036 else if (finfo
->info
->strip
== strip_some
6037 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6038 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
6040 else if (finfo
->info
->strip_discarded
6041 && (h
->root
.type
== bfd_link_hash_defined
6042 || h
->root
.type
== bfd_link_hash_defweak
)
6043 && elf_discarded_section (h
->root
.u
.def
.section
))
6048 /* If we're stripping it, and it's not a dynamic symbol, there's
6049 nothing else to do unless it is a forced local symbol. */
6052 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6056 sym
.st_size
= h
->size
;
6057 sym
.st_other
= h
->other
;
6058 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6059 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6060 else if (h
->root
.type
== bfd_link_hash_undefweak
6061 || h
->root
.type
== bfd_link_hash_defweak
)
6062 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6064 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6066 switch (h
->root
.type
)
6069 case bfd_link_hash_new
:
6070 case bfd_link_hash_warning
:
6074 case bfd_link_hash_undefined
:
6075 case bfd_link_hash_undefweak
:
6076 input_sec
= bfd_und_section_ptr
;
6077 sym
.st_shndx
= SHN_UNDEF
;
6080 case bfd_link_hash_defined
:
6081 case bfd_link_hash_defweak
:
6083 input_sec
= h
->root
.u
.def
.section
;
6084 if (input_sec
->output_section
!= NULL
)
6087 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6088 input_sec
->output_section
);
6089 if (sym
.st_shndx
== SHN_BAD
)
6091 char *sec_name
= bfd_get_section_ident (input_sec
);
6092 (*_bfd_error_handler
)
6093 (_("%s: could not find output section %s for input section %s"),
6094 bfd_get_filename (finfo
->output_bfd
),
6095 input_sec
->output_section
->name
,
6096 sec_name
? sec_name
: input_sec
->name
);
6099 eoinfo
->failed
= TRUE
;
6103 /* ELF symbols in relocatable files are section relative,
6104 but in nonrelocatable files they are virtual
6106 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6107 if (! finfo
->info
->relocatable
)
6109 sym
.st_value
+= input_sec
->output_section
->vma
;
6110 if (h
->type
== STT_TLS
)
6112 /* STT_TLS symbols are relative to PT_TLS segment
6114 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6115 sym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6121 BFD_ASSERT (input_sec
->owner
== NULL
6122 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6123 sym
.st_shndx
= SHN_UNDEF
;
6124 input_sec
= bfd_und_section_ptr
;
6129 case bfd_link_hash_common
:
6130 input_sec
= h
->root
.u
.c
.p
->section
;
6131 sym
.st_shndx
= SHN_COMMON
;
6132 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6135 case bfd_link_hash_indirect
:
6136 /* These symbols are created by symbol versioning. They point
6137 to the decorated version of the name. For example, if the
6138 symbol foo@@GNU_1.2 is the default, which should be used when
6139 foo is used with no version, then we add an indirect symbol
6140 foo which points to foo@@GNU_1.2. We ignore these symbols,
6141 since the indirected symbol is already in the hash table. */
6145 /* Give the processor backend a chance to tweak the symbol value,
6146 and also to finish up anything that needs to be done for this
6147 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6148 forced local syms when non-shared is due to a historical quirk. */
6149 if ((h
->dynindx
!= -1
6150 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6151 && ((finfo
->info
->shared
6152 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
6153 || h
->root
.type
!= bfd_link_hash_undefweak
))
6154 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6155 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6157 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6158 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6160 eoinfo
->failed
= TRUE
;
6165 /* If we are marking the symbol as undefined, and there are no
6166 non-weak references to this symbol from a regular object, then
6167 mark the symbol as weak undefined; if there are non-weak
6168 references, mark the symbol as strong. We can't do this earlier,
6169 because it might not be marked as undefined until the
6170 finish_dynamic_symbol routine gets through with it. */
6171 if (sym
.st_shndx
== SHN_UNDEF
6172 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6173 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6174 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6178 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6179 bindtype
= STB_GLOBAL
;
6181 bindtype
= STB_WEAK
;
6182 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6185 /* If a non-weak symbol with non-default visibility is not defined
6186 locally, it is a fatal error. */
6187 if (! finfo
->info
->relocatable
6188 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
6189 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
6190 && h
->root
.type
== bfd_link_hash_undefined
6191 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6193 (*_bfd_error_handler
)
6194 (_("%s: %s symbol `%s' isn't defined"),
6195 bfd_get_filename (finfo
->output_bfd
),
6196 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
6198 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
6199 ? "internal" : "hidden",
6200 h
->root
.root
.string
);
6201 eoinfo
->failed
= TRUE
;
6205 /* If this symbol should be put in the .dynsym section, then put it
6206 there now. We already know the symbol index. We also fill in
6207 the entry in the .hash section. */
6208 if (h
->dynindx
!= -1
6209 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6213 size_t hash_entry_size
;
6214 bfd_byte
*bucketpos
;
6218 sym
.st_name
= h
->dynstr_index
;
6219 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
6220 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
6222 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6223 bucket
= h
->elf_hash_value
% bucketcount
;
6225 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6226 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6227 + (bucket
+ 2) * hash_entry_size
);
6228 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6229 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
6230 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6231 ((bfd_byte
*) finfo
->hash_sec
->contents
6232 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6234 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6236 Elf_Internal_Versym iversym
;
6237 Elf_External_Versym
*eversym
;
6239 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6241 if (h
->verinfo
.verdef
== NULL
)
6242 iversym
.vs_vers
= 0;
6244 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6248 if (h
->verinfo
.vertree
== NULL
)
6249 iversym
.vs_vers
= 1;
6251 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6254 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6255 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6257 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6258 eversym
+= h
->dynindx
;
6259 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6263 /* If we're stripping it, then it was just a dynamic symbol, and
6264 there's nothing else to do. */
6265 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
6268 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6270 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
))
6272 eoinfo
->failed
= TRUE
;
6279 /* Return TRUE if special handling is done for relocs in SEC against
6280 symbols defined in discarded sections. */
6283 elf_section_ignore_discarded_relocs (asection
*sec
)
6285 const struct elf_backend_data
*bed
;
6287 switch (sec
->sec_info_type
)
6289 case ELF_INFO_TYPE_STABS
:
6290 case ELF_INFO_TYPE_EH_FRAME
:
6296 bed
= get_elf_backend_data (sec
->owner
);
6297 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
6298 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
6304 /* Return TRUE if we should complain about a reloc in SEC against a
6305 symbol defined in a discarded section. */
6308 elf_section_complain_discarded (asection
*sec
)
6310 if (strncmp (".stab", sec
->name
, 5) == 0
6311 && (!sec
->name
[5] ||
6312 (sec
->name
[5] == '.' && ISDIGIT (sec
->name
[6]))))
6315 if (strcmp (".eh_frame", sec
->name
) == 0)
6318 if (strcmp (".gcc_except_table", sec
->name
) == 0)
6324 /* Link an input file into the linker output file. This function
6325 handles all the sections and relocations of the input file at once.
6326 This is so that we only have to read the local symbols once, and
6327 don't have to keep them in memory. */
6330 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
6332 bfd_boolean (*relocate_section
)
6333 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
6334 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
6336 Elf_Internal_Shdr
*symtab_hdr
;
6339 Elf_Internal_Sym
*isymbuf
;
6340 Elf_Internal_Sym
*isym
;
6341 Elf_Internal_Sym
*isymend
;
6343 asection
**ppsection
;
6345 const struct elf_backend_data
*bed
;
6346 bfd_boolean emit_relocs
;
6347 struct elf_link_hash_entry
**sym_hashes
;
6349 output_bfd
= finfo
->output_bfd
;
6350 bed
= get_elf_backend_data (output_bfd
);
6351 relocate_section
= bed
->elf_backend_relocate_section
;
6353 /* If this is a dynamic object, we don't want to do anything here:
6354 we don't want the local symbols, and we don't want the section
6356 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6359 emit_relocs
= (finfo
->info
->relocatable
6360 || finfo
->info
->emitrelocations
6361 || bed
->elf_backend_emit_relocs
);
6363 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6364 if (elf_bad_symtab (input_bfd
))
6366 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
6371 locsymcount
= symtab_hdr
->sh_info
;
6372 extsymoff
= symtab_hdr
->sh_info
;
6375 /* Read the local symbols. */
6376 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6377 if (isymbuf
== NULL
&& locsymcount
!= 0)
6379 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6380 finfo
->internal_syms
,
6381 finfo
->external_syms
,
6382 finfo
->locsym_shndx
);
6383 if (isymbuf
== NULL
)
6387 /* Find local symbol sections and adjust values of symbols in
6388 SEC_MERGE sections. Write out those local symbols we know are
6389 going into the output file. */
6390 isymend
= isymbuf
+ locsymcount
;
6391 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
6393 isym
++, pindex
++, ppsection
++)
6397 Elf_Internal_Sym osym
;
6401 if (elf_bad_symtab (input_bfd
))
6403 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6410 if (isym
->st_shndx
== SHN_UNDEF
)
6411 isec
= bfd_und_section_ptr
;
6412 else if (isym
->st_shndx
< SHN_LORESERVE
6413 || isym
->st_shndx
> SHN_HIRESERVE
)
6415 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
6417 && isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
6418 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6420 _bfd_merged_section_offset (output_bfd
, &isec
,
6421 elf_section_data (isec
)->sec_info
,
6424 else if (isym
->st_shndx
== SHN_ABS
)
6425 isec
= bfd_abs_section_ptr
;
6426 else if (isym
->st_shndx
== SHN_COMMON
)
6427 isec
= bfd_com_section_ptr
;
6436 /* Don't output the first, undefined, symbol. */
6437 if (ppsection
== finfo
->sections
)
6440 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6442 /* We never output section symbols. Instead, we use the
6443 section symbol of the corresponding section in the output
6448 /* If we are stripping all symbols, we don't want to output this
6450 if (finfo
->info
->strip
== strip_all
)
6453 /* If we are discarding all local symbols, we don't want to
6454 output this one. If we are generating a relocatable output
6455 file, then some of the local symbols may be required by
6456 relocs; we output them below as we discover that they are
6458 if (finfo
->info
->discard
== discard_all
)
6461 /* If this symbol is defined in a section which we are
6462 discarding, we don't need to keep it, but note that
6463 linker_mark is only reliable for sections that have contents.
6464 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6465 as well as linker_mark. */
6466 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6468 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6469 || (! finfo
->info
->relocatable
6470 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6473 /* Get the name of the symbol. */
6474 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6479 /* See if we are discarding symbols with this name. */
6480 if ((finfo
->info
->strip
== strip_some
6481 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
6483 || (((finfo
->info
->discard
== discard_sec_merge
6484 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
6485 || finfo
->info
->discard
== discard_l
)
6486 && bfd_is_local_label_name (input_bfd
, name
)))
6489 /* If we get here, we are going to output this symbol. */
6493 /* Adjust the section index for the output file. */
6494 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6495 isec
->output_section
);
6496 if (osym
.st_shndx
== SHN_BAD
)
6499 *pindex
= bfd_get_symcount (output_bfd
);
6501 /* ELF symbols in relocatable files are section relative, but
6502 in executable files they are virtual addresses. Note that
6503 this code assumes that all ELF sections have an associated
6504 BFD section with a reasonable value for output_offset; below
6505 we assume that they also have a reasonable value for
6506 output_section. Any special sections must be set up to meet
6507 these requirements. */
6508 osym
.st_value
+= isec
->output_offset
;
6509 if (! finfo
->info
->relocatable
)
6511 osym
.st_value
+= isec
->output_section
->vma
;
6512 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
6514 /* STT_TLS symbols are relative to PT_TLS segment base. */
6515 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6516 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6520 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
))
6524 /* Relocate the contents of each section. */
6525 sym_hashes
= elf_sym_hashes (input_bfd
);
6526 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6530 if (! o
->linker_mark
)
6532 /* This section was omitted from the link. */
6536 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6537 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6540 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6542 /* Section was created by _bfd_elf_link_create_dynamic_sections
6547 /* Get the contents of the section. They have been cached by a
6548 relaxation routine. Note that o is a section in an input
6549 file, so the contents field will not have been set by any of
6550 the routines which work on output files. */
6551 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6552 contents
= elf_section_data (o
)->this_hdr
.contents
;
6555 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
6557 contents
= finfo
->contents
;
6558 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
6562 if ((o
->flags
& SEC_RELOC
) != 0)
6564 Elf_Internal_Rela
*internal_relocs
;
6565 bfd_vma r_type_mask
;
6568 /* Get the swapped relocs. */
6570 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
6571 finfo
->internal_relocs
, FALSE
);
6572 if (internal_relocs
== NULL
6573 && o
->reloc_count
> 0)
6576 if (bed
->s
->arch_size
== 32)
6583 r_type_mask
= 0xffffffff;
6587 /* Run through the relocs looking for any against symbols
6588 from discarded sections and section symbols from
6589 removed link-once sections. Complain about relocs
6590 against discarded sections. Zero relocs against removed
6591 link-once sections. Preserve debug information as much
6593 if (!elf_section_ignore_discarded_relocs (o
))
6595 Elf_Internal_Rela
*rel
, *relend
;
6596 bfd_boolean complain
= elf_section_complain_discarded (o
);
6598 rel
= internal_relocs
;
6599 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6600 for ( ; rel
< relend
; rel
++)
6602 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
6603 asection
**ps
, *sec
;
6604 struct elf_link_hash_entry
*h
= NULL
;
6605 const char *sym_name
;
6607 if (r_symndx
>= locsymcount
6608 || (elf_bad_symtab (input_bfd
)
6609 && finfo
->sections
[r_symndx
] == NULL
))
6611 h
= sym_hashes
[r_symndx
- extsymoff
];
6612 while (h
->root
.type
== bfd_link_hash_indirect
6613 || h
->root
.type
== bfd_link_hash_warning
)
6614 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6616 if (h
->root
.type
!= bfd_link_hash_defined
6617 && h
->root
.type
!= bfd_link_hash_defweak
)
6620 ps
= &h
->root
.u
.def
.section
;
6621 sym_name
= h
->root
.root
.string
;
6625 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
6626 ps
= &finfo
->sections
[r_symndx
];
6627 sym_name
= bfd_elf_local_sym_name (input_bfd
, sym
);
6630 /* Complain if the definition comes from a
6631 discarded section. */
6632 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
6634 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6636 BFD_ASSERT (r_symndx
!= 0);
6638 /* Try to preserve debug information.
6639 FIXME: This is quite broken. Modifying
6640 the symbol here means we will be changing
6641 all uses of the symbol, not just those in
6642 debug sections. The only thing that makes
6643 this half reasonable is that debug sections
6644 tend to come after other sections. Of
6645 course, that doesn't help with globals.
6646 ??? All link-once sections of the same name
6647 ought to define the same set of symbols, so
6648 it would seem that globals ought to always
6649 be defined in the kept section. */
6650 if (sec
->kept_section
!= NULL
6651 && sec
->size
== sec
->kept_section
->size
)
6653 *ps
= sec
->kept_section
;
6660 = bfd_get_section_ident (o
);
6662 = bfd_get_section_ident (sec
);
6663 finfo
->info
->callbacks
->error_handler
6664 (LD_DEFINITION_IN_DISCARDED_SECTION
,
6665 _("`%T' referenced in section `%s' of %B: "
6666 "defined in discarded section `%s' of %B\n"),
6668 r_sec
? r_sec
: o
->name
, input_bfd
,
6669 d_sec
? d_sec
: sec
->name
, sec
->owner
);
6676 /* Remove the symbol reference from the reloc, but
6677 don't kill the reloc completely. This is so that
6678 a zero value will be written into the section,
6679 which may have non-zero contents put there by the
6680 assembler. Zero in things like an eh_frame fde
6681 pc_begin allows stack unwinders to recognize the
6683 rel
->r_info
&= r_type_mask
;
6689 /* Relocate the section by invoking a back end routine.
6691 The back end routine is responsible for adjusting the
6692 section contents as necessary, and (if using Rela relocs
6693 and generating a relocatable output file) adjusting the
6694 reloc addend as necessary.
6696 The back end routine does not have to worry about setting
6697 the reloc address or the reloc symbol index.
6699 The back end routine is given a pointer to the swapped in
6700 internal symbols, and can access the hash table entries
6701 for the external symbols via elf_sym_hashes (input_bfd).
6703 When generating relocatable output, the back end routine
6704 must handle STB_LOCAL/STT_SECTION symbols specially. The
6705 output symbol is going to be a section symbol
6706 corresponding to the output section, which will require
6707 the addend to be adjusted. */
6709 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6710 input_bfd
, o
, contents
,
6718 Elf_Internal_Rela
*irela
;
6719 Elf_Internal_Rela
*irelaend
;
6720 bfd_vma last_offset
;
6721 struct elf_link_hash_entry
**rel_hash
;
6722 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
6723 unsigned int next_erel
;
6724 bfd_boolean (*reloc_emitter
)
6725 (bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*);
6726 bfd_boolean rela_normal
;
6728 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6729 rela_normal
= (bed
->rela_normal
6730 && (input_rel_hdr
->sh_entsize
6731 == bed
->s
->sizeof_rela
));
6733 /* Adjust the reloc addresses and symbol indices. */
6735 irela
= internal_relocs
;
6736 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6737 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6738 + elf_section_data (o
->output_section
)->rel_count
6739 + elf_section_data (o
->output_section
)->rel_count2
);
6740 last_offset
= o
->output_offset
;
6741 if (!finfo
->info
->relocatable
)
6742 last_offset
+= o
->output_section
->vma
;
6743 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6745 unsigned long r_symndx
;
6747 Elf_Internal_Sym sym
;
6749 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6755 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
6758 if (irela
->r_offset
>= (bfd_vma
) -2)
6760 /* This is a reloc for a deleted entry or somesuch.
6761 Turn it into an R_*_NONE reloc, at the same
6762 offset as the last reloc. elf_eh_frame.c and
6763 elf_bfd_discard_info rely on reloc offsets
6765 irela
->r_offset
= last_offset
;
6767 irela
->r_addend
= 0;
6771 irela
->r_offset
+= o
->output_offset
;
6773 /* Relocs in an executable have to be virtual addresses. */
6774 if (!finfo
->info
->relocatable
)
6775 irela
->r_offset
+= o
->output_section
->vma
;
6777 last_offset
= irela
->r_offset
;
6779 r_symndx
= irela
->r_info
>> r_sym_shift
;
6780 if (r_symndx
== STN_UNDEF
)
6783 if (r_symndx
>= locsymcount
6784 || (elf_bad_symtab (input_bfd
)
6785 && finfo
->sections
[r_symndx
] == NULL
))
6787 struct elf_link_hash_entry
*rh
;
6790 /* This is a reloc against a global symbol. We
6791 have not yet output all the local symbols, so
6792 we do not know the symbol index of any global
6793 symbol. We set the rel_hash entry for this
6794 reloc to point to the global hash table entry
6795 for this symbol. The symbol index is then
6796 set at the end of elf_bfd_final_link. */
6797 indx
= r_symndx
- extsymoff
;
6798 rh
= elf_sym_hashes (input_bfd
)[indx
];
6799 while (rh
->root
.type
== bfd_link_hash_indirect
6800 || rh
->root
.type
== bfd_link_hash_warning
)
6801 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6803 /* Setting the index to -2 tells
6804 elf_link_output_extsym that this symbol is
6806 BFD_ASSERT (rh
->indx
< 0);
6814 /* This is a reloc against a local symbol. */
6817 sym
= isymbuf
[r_symndx
];
6818 sec
= finfo
->sections
[r_symndx
];
6819 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
6821 /* I suppose the backend ought to fill in the
6822 section of any STT_SECTION symbol against a
6823 processor specific section. */
6825 if (bfd_is_abs_section (sec
))
6827 else if (sec
== NULL
|| sec
->owner
== NULL
)
6829 bfd_set_error (bfd_error_bad_value
);
6834 asection
*osec
= sec
->output_section
;
6836 /* If we have discarded a section, the output
6837 section will be the absolute section. In
6838 case of discarded link-once and discarded
6839 SEC_MERGE sections, use the kept section. */
6840 if (bfd_is_abs_section (osec
)
6841 && sec
->kept_section
!= NULL
6842 && sec
->kept_section
->output_section
!= NULL
)
6844 osec
= sec
->kept_section
->output_section
;
6845 irela
->r_addend
-= osec
->vma
;
6848 if (!bfd_is_abs_section (osec
))
6850 r_symndx
= osec
->target_index
;
6851 BFD_ASSERT (r_symndx
!= 0);
6855 /* Adjust the addend according to where the
6856 section winds up in the output section. */
6858 irela
->r_addend
+= sec
->output_offset
;
6862 if (finfo
->indices
[r_symndx
] == -1)
6864 unsigned long shlink
;
6868 if (finfo
->info
->strip
== strip_all
)
6870 /* You can't do ld -r -s. */
6871 bfd_set_error (bfd_error_invalid_operation
);
6875 /* This symbol was skipped earlier, but
6876 since it is needed by a reloc, we
6877 must output it now. */
6878 shlink
= symtab_hdr
->sh_link
;
6879 name
= (bfd_elf_string_from_elf_section
6880 (input_bfd
, shlink
, sym
.st_name
));
6884 osec
= sec
->output_section
;
6886 _bfd_elf_section_from_bfd_section (output_bfd
,
6888 if (sym
.st_shndx
== SHN_BAD
)
6891 sym
.st_value
+= sec
->output_offset
;
6892 if (! finfo
->info
->relocatable
)
6894 sym
.st_value
+= osec
->vma
;
6895 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
6897 /* STT_TLS symbols are relative to PT_TLS
6899 BFD_ASSERT (elf_hash_table (finfo
->info
)
6901 sym
.st_value
-= (elf_hash_table (finfo
->info
)
6906 finfo
->indices
[r_symndx
]
6907 = bfd_get_symcount (output_bfd
);
6909 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
,
6914 r_symndx
= finfo
->indices
[r_symndx
];
6917 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
6918 | (irela
->r_info
& r_type_mask
));
6921 /* Swap out the relocs. */
6922 if (bed
->elf_backend_emit_relocs
6923 && !(finfo
->info
->relocatable
6924 || finfo
->info
->emitrelocations
))
6925 reloc_emitter
= bed
->elf_backend_emit_relocs
;
6927 reloc_emitter
= _bfd_elf_link_output_relocs
;
6929 if (input_rel_hdr
->sh_size
!= 0
6930 && ! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
6934 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
6935 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
6937 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
6938 * bed
->s
->int_rels_per_ext_rel
);
6939 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr2
,
6946 /* Write out the modified section contents. */
6947 if (bed
->elf_backend_write_section
6948 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
6950 /* Section written out. */
6952 else switch (o
->sec_info_type
)
6954 case ELF_INFO_TYPE_STABS
:
6955 if (! (_bfd_write_section_stabs
6957 &elf_hash_table (finfo
->info
)->stab_info
,
6958 o
, &elf_section_data (o
)->sec_info
, contents
)))
6961 case ELF_INFO_TYPE_MERGE
:
6962 if (! _bfd_write_merged_section (output_bfd
, o
,
6963 elf_section_data (o
)->sec_info
))
6966 case ELF_INFO_TYPE_EH_FRAME
:
6968 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
6975 if (! (o
->flags
& SEC_EXCLUDE
)
6976 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
6978 (file_ptr
) o
->output_offset
,
6989 /* Generate a reloc when linking an ELF file. This is a reloc
6990 requested by the linker, and does come from any input file. This
6991 is used to build constructor and destructor tables when linking
6995 elf_reloc_link_order (bfd
*output_bfd
,
6996 struct bfd_link_info
*info
,
6997 asection
*output_section
,
6998 struct bfd_link_order
*link_order
)
7000 reloc_howto_type
*howto
;
7004 struct elf_link_hash_entry
**rel_hash_ptr
;
7005 Elf_Internal_Shdr
*rel_hdr
;
7006 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7007 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
7011 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
7014 bfd_set_error (bfd_error_bad_value
);
7018 addend
= link_order
->u
.reloc
.p
->addend
;
7020 /* Figure out the symbol index. */
7021 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
7022 + elf_section_data (output_section
)->rel_count
7023 + elf_section_data (output_section
)->rel_count2
);
7024 if (link_order
->type
== bfd_section_reloc_link_order
)
7026 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
7027 BFD_ASSERT (indx
!= 0);
7028 *rel_hash_ptr
= NULL
;
7032 struct elf_link_hash_entry
*h
;
7034 /* Treat a reloc against a defined symbol as though it were
7035 actually against the section. */
7036 h
= ((struct elf_link_hash_entry
*)
7037 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7038 link_order
->u
.reloc
.p
->u
.name
,
7039 FALSE
, FALSE
, TRUE
));
7041 && (h
->root
.type
== bfd_link_hash_defined
7042 || h
->root
.type
== bfd_link_hash_defweak
))
7046 section
= h
->root
.u
.def
.section
;
7047 indx
= section
->output_section
->target_index
;
7048 *rel_hash_ptr
= NULL
;
7049 /* It seems that we ought to add the symbol value to the
7050 addend here, but in practice it has already been added
7051 because it was passed to constructor_callback. */
7052 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7056 /* Setting the index to -2 tells elf_link_output_extsym that
7057 this symbol is used by a reloc. */
7064 if (! ((*info
->callbacks
->unattached_reloc
)
7065 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
7071 /* If this is an inplace reloc, we must write the addend into the
7073 if (howto
->partial_inplace
&& addend
!= 0)
7076 bfd_reloc_status_type rstat
;
7079 const char *sym_name
;
7081 size
= bfd_get_reloc_size (howto
);
7082 buf
= bfd_zmalloc (size
);
7085 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
7092 case bfd_reloc_outofrange
:
7095 case bfd_reloc_overflow
:
7096 if (link_order
->type
== bfd_section_reloc_link_order
)
7097 sym_name
= bfd_section_name (output_bfd
,
7098 link_order
->u
.reloc
.p
->u
.section
);
7100 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7101 if (! ((*info
->callbacks
->reloc_overflow
)
7102 (info
, sym_name
, howto
->name
, addend
, NULL
, NULL
, 0)))
7109 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
7110 link_order
->offset
, size
);
7116 /* The address of a reloc is relative to the section in a
7117 relocatable file, and is a virtual address in an executable
7119 offset
= link_order
->offset
;
7120 if (! info
->relocatable
)
7121 offset
+= output_section
->vma
;
7123 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7125 irel
[i
].r_offset
= offset
;
7127 irel
[i
].r_addend
= 0;
7129 if (bed
->s
->arch_size
== 32)
7130 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
7132 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
7134 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7135 erel
= rel_hdr
->contents
;
7136 if (rel_hdr
->sh_type
== SHT_REL
)
7138 erel
+= (elf_section_data (output_section
)->rel_count
7139 * bed
->s
->sizeof_rel
);
7140 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
7144 irel
[0].r_addend
= addend
;
7145 erel
+= (elf_section_data (output_section
)->rel_count
7146 * bed
->s
->sizeof_rela
);
7147 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
7150 ++elf_section_data (output_section
)->rel_count
;
7155 /* Do the final step of an ELF link. */
7158 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
7160 bfd_boolean dynamic
;
7161 bfd_boolean emit_relocs
;
7163 struct elf_final_link_info finfo
;
7164 register asection
*o
;
7165 register struct bfd_link_order
*p
;
7167 bfd_size_type max_contents_size
;
7168 bfd_size_type max_external_reloc_size
;
7169 bfd_size_type max_internal_reloc_count
;
7170 bfd_size_type max_sym_count
;
7171 bfd_size_type max_sym_shndx_count
;
7173 Elf_Internal_Sym elfsym
;
7175 Elf_Internal_Shdr
*symtab_hdr
;
7176 Elf_Internal_Shdr
*symtab_shndx_hdr
;
7177 Elf_Internal_Shdr
*symstrtab_hdr
;
7178 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7179 struct elf_outext_info eoinfo
;
7181 size_t relativecount
= 0;
7182 asection
*reldyn
= 0;
7185 if (! is_elf_hash_table (info
->hash
))
7189 abfd
->flags
|= DYNAMIC
;
7191 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
7192 dynobj
= elf_hash_table (info
)->dynobj
;
7194 emit_relocs
= (info
->relocatable
7195 || info
->emitrelocations
7196 || bed
->elf_backend_emit_relocs
);
7199 finfo
.output_bfd
= abfd
;
7200 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
7201 if (finfo
.symstrtab
== NULL
)
7206 finfo
.dynsym_sec
= NULL
;
7207 finfo
.hash_sec
= NULL
;
7208 finfo
.symver_sec
= NULL
;
7212 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
7213 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
7214 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
7215 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
7216 /* Note that it is OK if symver_sec is NULL. */
7219 finfo
.contents
= NULL
;
7220 finfo
.external_relocs
= NULL
;
7221 finfo
.internal_relocs
= NULL
;
7222 finfo
.external_syms
= NULL
;
7223 finfo
.locsym_shndx
= NULL
;
7224 finfo
.internal_syms
= NULL
;
7225 finfo
.indices
= NULL
;
7226 finfo
.sections
= NULL
;
7227 finfo
.symbuf
= NULL
;
7228 finfo
.symshndxbuf
= NULL
;
7229 finfo
.symbuf_count
= 0;
7230 finfo
.shndxbuf_size
= 0;
7232 /* Count up the number of relocations we will output for each output
7233 section, so that we know the sizes of the reloc sections. We
7234 also figure out some maximum sizes. */
7235 max_contents_size
= 0;
7236 max_external_reloc_size
= 0;
7237 max_internal_reloc_count
= 0;
7239 max_sym_shndx_count
= 0;
7241 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7243 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
7246 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7248 unsigned int reloc_count
= 0;
7249 struct bfd_elf_section_data
*esdi
= NULL
;
7250 unsigned int *rel_count1
;
7252 if (p
->type
== bfd_section_reloc_link_order
7253 || p
->type
== bfd_symbol_reloc_link_order
)
7255 else if (p
->type
== bfd_indirect_link_order
)
7259 sec
= p
->u
.indirect
.section
;
7260 esdi
= elf_section_data (sec
);
7262 /* Mark all sections which are to be included in the
7263 link. This will normally be every section. We need
7264 to do this so that we can identify any sections which
7265 the linker has decided to not include. */
7266 sec
->linker_mark
= TRUE
;
7268 if (sec
->flags
& SEC_MERGE
)
7271 if (info
->relocatable
|| info
->emitrelocations
)
7272 reloc_count
= sec
->reloc_count
;
7273 else if (bed
->elf_backend_count_relocs
)
7275 Elf_Internal_Rela
* relocs
;
7277 relocs
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
7280 reloc_count
= (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
7282 if (elf_section_data (o
)->relocs
!= relocs
)
7286 if (sec
->rawsize
> max_contents_size
)
7287 max_contents_size
= sec
->rawsize
;
7288 if (sec
->size
> max_contents_size
)
7289 max_contents_size
= sec
->size
;
7291 /* We are interested in just local symbols, not all
7293 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
7294 && (sec
->owner
->flags
& DYNAMIC
) == 0)
7298 if (elf_bad_symtab (sec
->owner
))
7299 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
7300 / bed
->s
->sizeof_sym
);
7302 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
7304 if (sym_count
> max_sym_count
)
7305 max_sym_count
= sym_count
;
7307 if (sym_count
> max_sym_shndx_count
7308 && elf_symtab_shndx (sec
->owner
) != 0)
7309 max_sym_shndx_count
= sym_count
;
7311 if ((sec
->flags
& SEC_RELOC
) != 0)
7315 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
7316 if (ext_size
> max_external_reloc_size
)
7317 max_external_reloc_size
= ext_size
;
7318 if (sec
->reloc_count
> max_internal_reloc_count
)
7319 max_internal_reloc_count
= sec
->reloc_count
;
7324 if (reloc_count
== 0)
7327 o
->reloc_count
+= reloc_count
;
7329 /* MIPS may have a mix of REL and RELA relocs on sections.
7330 To support this curious ABI we keep reloc counts in
7331 elf_section_data too. We must be careful to add the
7332 relocations from the input section to the right output
7333 count. FIXME: Get rid of one count. We have
7334 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
7335 rel_count1
= &esdo
->rel_count
;
7338 bfd_boolean same_size
;
7339 bfd_size_type entsize1
;
7341 entsize1
= esdi
->rel_hdr
.sh_entsize
;
7342 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
7343 || entsize1
== bed
->s
->sizeof_rela
);
7344 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
7347 rel_count1
= &esdo
->rel_count2
;
7349 if (esdi
->rel_hdr2
!= NULL
)
7351 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
7352 unsigned int alt_count
;
7353 unsigned int *rel_count2
;
7355 BFD_ASSERT (entsize2
!= entsize1
7356 && (entsize2
== bed
->s
->sizeof_rel
7357 || entsize2
== bed
->s
->sizeof_rela
));
7359 rel_count2
= &esdo
->rel_count2
;
7361 rel_count2
= &esdo
->rel_count
;
7363 /* The following is probably too simplistic if the
7364 backend counts output relocs unusually. */
7365 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
7366 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
7367 *rel_count2
+= alt_count
;
7368 reloc_count
-= alt_count
;
7371 *rel_count1
+= reloc_count
;
7374 if (o
->reloc_count
> 0)
7375 o
->flags
|= SEC_RELOC
;
7378 /* Explicitly clear the SEC_RELOC flag. The linker tends to
7379 set it (this is probably a bug) and if it is set
7380 assign_section_numbers will create a reloc section. */
7381 o
->flags
&=~ SEC_RELOC
;
7384 /* If the SEC_ALLOC flag is not set, force the section VMA to
7385 zero. This is done in elf_fake_sections as well, but forcing
7386 the VMA to 0 here will ensure that relocs against these
7387 sections are handled correctly. */
7388 if ((o
->flags
& SEC_ALLOC
) == 0
7389 && ! o
->user_set_vma
)
7393 if (! info
->relocatable
&& merged
)
7394 elf_link_hash_traverse (elf_hash_table (info
),
7395 _bfd_elf_link_sec_merge_syms
, abfd
);
7397 /* Figure out the file positions for everything but the symbol table
7398 and the relocs. We set symcount to force assign_section_numbers
7399 to create a symbol table. */
7400 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
7401 BFD_ASSERT (! abfd
->output_has_begun
);
7402 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
7405 /* That created the reloc sections. Set their sizes, and assign
7406 them file positions, and allocate some buffers. */
7407 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7409 if ((o
->flags
& SEC_RELOC
) != 0)
7411 if (!(_bfd_elf_link_size_reloc_section
7412 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
7415 if (elf_section_data (o
)->rel_hdr2
7416 && !(_bfd_elf_link_size_reloc_section
7417 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
7421 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
7422 to count upwards while actually outputting the relocations. */
7423 elf_section_data (o
)->rel_count
= 0;
7424 elf_section_data (o
)->rel_count2
= 0;
7427 _bfd_elf_assign_file_positions_for_relocs (abfd
);
7429 /* We have now assigned file positions for all the sections except
7430 .symtab and .strtab. We start the .symtab section at the current
7431 file position, and write directly to it. We build the .strtab
7432 section in memory. */
7433 bfd_get_symcount (abfd
) = 0;
7434 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
7435 /* sh_name is set in prep_headers. */
7436 symtab_hdr
->sh_type
= SHT_SYMTAB
;
7437 /* sh_flags, sh_addr and sh_size all start off zero. */
7438 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
7439 /* sh_link is set in assign_section_numbers. */
7440 /* sh_info is set below. */
7441 /* sh_offset is set just below. */
7442 symtab_hdr
->sh_addralign
= 1 << bed
->s
->log_file_align
;
7444 off
= elf_tdata (abfd
)->next_file_pos
;
7445 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
7447 /* Note that at this point elf_tdata (abfd)->next_file_pos is
7448 incorrect. We do not yet know the size of the .symtab section.
7449 We correct next_file_pos below, after we do know the size. */
7451 /* Allocate a buffer to hold swapped out symbols. This is to avoid
7452 continuously seeking to the right position in the file. */
7453 if (! info
->keep_memory
|| max_sym_count
< 20)
7454 finfo
.symbuf_size
= 20;
7456 finfo
.symbuf_size
= max_sym_count
;
7457 amt
= finfo
.symbuf_size
;
7458 amt
*= bed
->s
->sizeof_sym
;
7459 finfo
.symbuf
= bfd_malloc (amt
);
7460 if (finfo
.symbuf
== NULL
)
7462 if (elf_numsections (abfd
) > SHN_LORESERVE
)
7464 /* Wild guess at number of output symbols. realloc'd as needed. */
7465 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
7466 finfo
.shndxbuf_size
= amt
;
7467 amt
*= sizeof (Elf_External_Sym_Shndx
);
7468 finfo
.symshndxbuf
= bfd_zmalloc (amt
);
7469 if (finfo
.symshndxbuf
== NULL
)
7473 /* Start writing out the symbol table. The first symbol is always a
7475 if (info
->strip
!= strip_all
7478 elfsym
.st_value
= 0;
7481 elfsym
.st_other
= 0;
7482 elfsym
.st_shndx
= SHN_UNDEF
;
7483 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
7489 /* Some standard ELF linkers do this, but we don't because it causes
7490 bootstrap comparison failures. */
7491 /* Output a file symbol for the output file as the second symbol.
7492 We output this even if we are discarding local symbols, although
7493 I'm not sure if this is correct. */
7494 elfsym
.st_value
= 0;
7496 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
7497 elfsym
.st_other
= 0;
7498 elfsym
.st_shndx
= SHN_ABS
;
7499 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
7500 &elfsym
, bfd_abs_section_ptr
, NULL
))
7504 /* Output a symbol for each section. We output these even if we are
7505 discarding local symbols, since they are used for relocs. These
7506 symbols have no names. We store the index of each one in the
7507 index field of the section, so that we can find it again when
7508 outputting relocs. */
7509 if (info
->strip
!= strip_all
7513 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7514 elfsym
.st_other
= 0;
7515 for (i
= 1; i
< elf_numsections (abfd
); i
++)
7517 o
= bfd_section_from_elf_index (abfd
, i
);
7519 o
->target_index
= bfd_get_symcount (abfd
);
7520 elfsym
.st_shndx
= i
;
7521 if (info
->relocatable
|| o
== NULL
)
7522 elfsym
.st_value
= 0;
7524 elfsym
.st_value
= o
->vma
;
7525 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
))
7527 if (i
== SHN_LORESERVE
- 1)
7528 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
7532 /* Allocate some memory to hold information read in from the input
7534 if (max_contents_size
!= 0)
7536 finfo
.contents
= bfd_malloc (max_contents_size
);
7537 if (finfo
.contents
== NULL
)
7541 if (max_external_reloc_size
!= 0)
7543 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
7544 if (finfo
.external_relocs
== NULL
)
7548 if (max_internal_reloc_count
!= 0)
7550 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7551 amt
*= sizeof (Elf_Internal_Rela
);
7552 finfo
.internal_relocs
= bfd_malloc (amt
);
7553 if (finfo
.internal_relocs
== NULL
)
7557 if (max_sym_count
!= 0)
7559 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
7560 finfo
.external_syms
= bfd_malloc (amt
);
7561 if (finfo
.external_syms
== NULL
)
7564 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
7565 finfo
.internal_syms
= bfd_malloc (amt
);
7566 if (finfo
.internal_syms
== NULL
)
7569 amt
= max_sym_count
* sizeof (long);
7570 finfo
.indices
= bfd_malloc (amt
);
7571 if (finfo
.indices
== NULL
)
7574 amt
= max_sym_count
* sizeof (asection
*);
7575 finfo
.sections
= bfd_malloc (amt
);
7576 if (finfo
.sections
== NULL
)
7580 if (max_sym_shndx_count
!= 0)
7582 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
7583 finfo
.locsym_shndx
= bfd_malloc (amt
);
7584 if (finfo
.locsym_shndx
== NULL
)
7588 if (elf_hash_table (info
)->tls_sec
)
7590 bfd_vma base
, end
= 0;
7593 for (sec
= elf_hash_table (info
)->tls_sec
;
7594 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
7597 bfd_vma size
= sec
->size
;
7599 if (size
== 0 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
7601 struct bfd_link_order
*o
;
7603 for (o
= sec
->link_order_head
; o
!= NULL
; o
= o
->next
)
7604 if (size
< o
->offset
+ o
->size
)
7605 size
= o
->offset
+ o
->size
;
7607 end
= sec
->vma
+ size
;
7609 base
= elf_hash_table (info
)->tls_sec
->vma
;
7610 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
7611 elf_hash_table (info
)->tls_size
= end
- base
;
7614 /* Since ELF permits relocations to be against local symbols, we
7615 must have the local symbols available when we do the relocations.
7616 Since we would rather only read the local symbols once, and we
7617 would rather not keep them in memory, we handle all the
7618 relocations for a single input file at the same time.
7620 Unfortunately, there is no way to know the total number of local
7621 symbols until we have seen all of them, and the local symbol
7622 indices precede the global symbol indices. This means that when
7623 we are generating relocatable output, and we see a reloc against
7624 a global symbol, we can not know the symbol index until we have
7625 finished examining all the local symbols to see which ones we are
7626 going to output. To deal with this, we keep the relocations in
7627 memory, and don't output them until the end of the link. This is
7628 an unfortunate waste of memory, but I don't see a good way around
7629 it. Fortunately, it only happens when performing a relocatable
7630 link, which is not the common case. FIXME: If keep_memory is set
7631 we could write the relocs out and then read them again; I don't
7632 know how bad the memory loss will be. */
7634 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7635 sub
->output_has_begun
= FALSE
;
7636 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7638 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7640 if (p
->type
== bfd_indirect_link_order
7641 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
7642 == bfd_target_elf_flavour
)
7643 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
7645 if (! sub
->output_has_begun
)
7647 if (! elf_link_input_bfd (&finfo
, sub
))
7649 sub
->output_has_begun
= TRUE
;
7652 else if (p
->type
== bfd_section_reloc_link_order
7653 || p
->type
== bfd_symbol_reloc_link_order
)
7655 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
7660 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
7666 /* Output any global symbols that got converted to local in a
7667 version script or due to symbol visibility. We do this in a
7668 separate step since ELF requires all local symbols to appear
7669 prior to any global symbols. FIXME: We should only do this if
7670 some global symbols were, in fact, converted to become local.
7671 FIXME: Will this work correctly with the Irix 5 linker? */
7672 eoinfo
.failed
= FALSE
;
7673 eoinfo
.finfo
= &finfo
;
7674 eoinfo
.localsyms
= TRUE
;
7675 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
7680 /* That wrote out all the local symbols. Finish up the symbol table
7681 with the global symbols. Even if we want to strip everything we
7682 can, we still need to deal with those global symbols that got
7683 converted to local in a version script. */
7685 /* The sh_info field records the index of the first non local symbol. */
7686 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
7689 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
7691 Elf_Internal_Sym sym
;
7692 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
7693 long last_local
= 0;
7695 /* Write out the section symbols for the output sections. */
7702 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7705 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
7711 dynindx
= elf_section_data (s
)->dynindx
;
7714 indx
= elf_section_data (s
)->this_idx
;
7715 BFD_ASSERT (indx
> 0);
7716 sym
.st_shndx
= indx
;
7717 sym
.st_value
= s
->vma
;
7718 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
7719 if (last_local
< dynindx
)
7720 last_local
= dynindx
;
7721 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
7725 /* Write out the local dynsyms. */
7726 if (elf_hash_table (info
)->dynlocal
)
7728 struct elf_link_local_dynamic_entry
*e
;
7729 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
7734 sym
.st_size
= e
->isym
.st_size
;
7735 sym
.st_other
= e
->isym
.st_other
;
7737 /* Copy the internal symbol as is.
7738 Note that we saved a word of storage and overwrote
7739 the original st_name with the dynstr_index. */
7742 if (e
->isym
.st_shndx
!= SHN_UNDEF
7743 && (e
->isym
.st_shndx
< SHN_LORESERVE
7744 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
7746 s
= bfd_section_from_elf_index (e
->input_bfd
,
7750 elf_section_data (s
->output_section
)->this_idx
;
7751 sym
.st_value
= (s
->output_section
->vma
7753 + e
->isym
.st_value
);
7756 if (last_local
< e
->dynindx
)
7757 last_local
= e
->dynindx
;
7759 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
7760 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
7764 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
7768 /* We get the global symbols from the hash table. */
7769 eoinfo
.failed
= FALSE
;
7770 eoinfo
.localsyms
= FALSE
;
7771 eoinfo
.finfo
= &finfo
;
7772 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
7777 /* If backend needs to output some symbols not present in the hash
7778 table, do it now. */
7779 if (bed
->elf_backend_output_arch_syms
)
7781 typedef bfd_boolean (*out_sym_func
)
7782 (void *, const char *, Elf_Internal_Sym
*, asection
*,
7783 struct elf_link_hash_entry
*);
7785 if (! ((*bed
->elf_backend_output_arch_syms
)
7786 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
7790 /* Flush all symbols to the file. */
7791 if (! elf_link_flush_output_syms (&finfo
, bed
))
7794 /* Now we know the size of the symtab section. */
7795 off
+= symtab_hdr
->sh_size
;
7797 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
7798 if (symtab_shndx_hdr
->sh_name
!= 0)
7800 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
7801 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
7802 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
7803 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
7804 symtab_shndx_hdr
->sh_size
= amt
;
7806 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
7809 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
7810 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
7815 /* Finish up and write out the symbol string table (.strtab)
7817 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
7818 /* sh_name was set in prep_headers. */
7819 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
7820 symstrtab_hdr
->sh_flags
= 0;
7821 symstrtab_hdr
->sh_addr
= 0;
7822 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
7823 symstrtab_hdr
->sh_entsize
= 0;
7824 symstrtab_hdr
->sh_link
= 0;
7825 symstrtab_hdr
->sh_info
= 0;
7826 /* sh_offset is set just below. */
7827 symstrtab_hdr
->sh_addralign
= 1;
7829 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
7830 elf_tdata (abfd
)->next_file_pos
= off
;
7832 if (bfd_get_symcount (abfd
) > 0)
7834 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
7835 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
7839 /* Adjust the relocs to have the correct symbol indices. */
7840 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7842 if ((o
->flags
& SEC_RELOC
) == 0)
7845 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
7846 elf_section_data (o
)->rel_count
,
7847 elf_section_data (o
)->rel_hashes
);
7848 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
7849 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
7850 elf_section_data (o
)->rel_count2
,
7851 (elf_section_data (o
)->rel_hashes
7852 + elf_section_data (o
)->rel_count
));
7854 /* Set the reloc_count field to 0 to prevent write_relocs from
7855 trying to swap the relocs out itself. */
7859 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
7860 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
7862 /* If we are linking against a dynamic object, or generating a
7863 shared library, finish up the dynamic linking information. */
7866 bfd_byte
*dyncon
, *dynconend
;
7868 /* Fix up .dynamic entries. */
7869 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
7870 BFD_ASSERT (o
!= NULL
);
7872 dyncon
= o
->contents
;
7873 dynconend
= o
->contents
+ o
->size
;
7874 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
7876 Elf_Internal_Dyn dyn
;
7880 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
7887 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
7889 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
7891 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
7892 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
7895 dyn
.d_un
.d_val
= relativecount
;
7902 name
= info
->init_function
;
7905 name
= info
->fini_function
;
7908 struct elf_link_hash_entry
*h
;
7910 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
7911 FALSE
, FALSE
, TRUE
);
7913 && (h
->root
.type
== bfd_link_hash_defined
7914 || h
->root
.type
== bfd_link_hash_defweak
))
7916 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
7917 o
= h
->root
.u
.def
.section
;
7918 if (o
->output_section
!= NULL
)
7919 dyn
.d_un
.d_val
+= (o
->output_section
->vma
7920 + o
->output_offset
);
7923 /* The symbol is imported from another shared
7924 library and does not apply to this one. */
7932 case DT_PREINIT_ARRAYSZ
:
7933 name
= ".preinit_array";
7935 case DT_INIT_ARRAYSZ
:
7936 name
= ".init_array";
7938 case DT_FINI_ARRAYSZ
:
7939 name
= ".fini_array";
7941 o
= bfd_get_section_by_name (abfd
, name
);
7944 (*_bfd_error_handler
)
7945 (_("%s: could not find output section %s"),
7946 bfd_get_filename (abfd
), name
);
7950 (*_bfd_error_handler
)
7951 (_("warning: %s section has zero size"), name
);
7952 dyn
.d_un
.d_val
= o
->size
;
7955 case DT_PREINIT_ARRAY
:
7956 name
= ".preinit_array";
7959 name
= ".init_array";
7962 name
= ".fini_array";
7975 name
= ".gnu.version_d";
7978 name
= ".gnu.version_r";
7981 name
= ".gnu.version";
7983 o
= bfd_get_section_by_name (abfd
, name
);
7986 (*_bfd_error_handler
)
7987 (_("%s: could not find output section %s"),
7988 bfd_get_filename (abfd
), name
);
7991 dyn
.d_un
.d_ptr
= o
->vma
;
7998 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
8003 for (i
= 1; i
< elf_numsections (abfd
); i
++)
8005 Elf_Internal_Shdr
*hdr
;
8007 hdr
= elf_elfsections (abfd
)[i
];
8008 if (hdr
->sh_type
== type
8009 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
8011 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
8012 dyn
.d_un
.d_val
+= hdr
->sh_size
;
8015 if (dyn
.d_un
.d_val
== 0
8016 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
8017 dyn
.d_un
.d_val
= hdr
->sh_addr
;
8023 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
8027 /* If we have created any dynamic sections, then output them. */
8030 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
8033 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
8035 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
8037 || o
->output_section
== bfd_abs_section_ptr
)
8039 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
8041 /* At this point, we are only interested in sections
8042 created by _bfd_elf_link_create_dynamic_sections. */
8045 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
8047 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
8049 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
8051 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
8053 if (! bfd_set_section_contents (abfd
, o
->output_section
,
8055 (file_ptr
) o
->output_offset
,
8061 /* The contents of the .dynstr section are actually in a
8063 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
8064 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
8065 || ! _bfd_elf_strtab_emit (abfd
,
8066 elf_hash_table (info
)->dynstr
))
8072 if (info
->relocatable
)
8074 bfd_boolean failed
= FALSE
;
8076 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
8081 /* If we have optimized stabs strings, output them. */
8082 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
8084 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
8088 if (info
->eh_frame_hdr
)
8090 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
8094 if (finfo
.symstrtab
!= NULL
)
8095 _bfd_stringtab_free (finfo
.symstrtab
);
8096 if (finfo
.contents
!= NULL
)
8097 free (finfo
.contents
);
8098 if (finfo
.external_relocs
!= NULL
)
8099 free (finfo
.external_relocs
);
8100 if (finfo
.internal_relocs
!= NULL
)
8101 free (finfo
.internal_relocs
);
8102 if (finfo
.external_syms
!= NULL
)
8103 free (finfo
.external_syms
);
8104 if (finfo
.locsym_shndx
!= NULL
)
8105 free (finfo
.locsym_shndx
);
8106 if (finfo
.internal_syms
!= NULL
)
8107 free (finfo
.internal_syms
);
8108 if (finfo
.indices
!= NULL
)
8109 free (finfo
.indices
);
8110 if (finfo
.sections
!= NULL
)
8111 free (finfo
.sections
);
8112 if (finfo
.symbuf
!= NULL
)
8113 free (finfo
.symbuf
);
8114 if (finfo
.symshndxbuf
!= NULL
)
8115 free (finfo
.symshndxbuf
);
8116 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8118 if ((o
->flags
& SEC_RELOC
) != 0
8119 && elf_section_data (o
)->rel_hashes
!= NULL
)
8120 free (elf_section_data (o
)->rel_hashes
);
8123 elf_tdata (abfd
)->linker
= TRUE
;
8128 if (finfo
.symstrtab
!= NULL
)
8129 _bfd_stringtab_free (finfo
.symstrtab
);
8130 if (finfo
.contents
!= NULL
)
8131 free (finfo
.contents
);
8132 if (finfo
.external_relocs
!= NULL
)
8133 free (finfo
.external_relocs
);
8134 if (finfo
.internal_relocs
!= NULL
)
8135 free (finfo
.internal_relocs
);
8136 if (finfo
.external_syms
!= NULL
)
8137 free (finfo
.external_syms
);
8138 if (finfo
.locsym_shndx
!= NULL
)
8139 free (finfo
.locsym_shndx
);
8140 if (finfo
.internal_syms
!= NULL
)
8141 free (finfo
.internal_syms
);
8142 if (finfo
.indices
!= NULL
)
8143 free (finfo
.indices
);
8144 if (finfo
.sections
!= NULL
)
8145 free (finfo
.sections
);
8146 if (finfo
.symbuf
!= NULL
)
8147 free (finfo
.symbuf
);
8148 if (finfo
.symshndxbuf
!= NULL
)
8149 free (finfo
.symshndxbuf
);
8150 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8152 if ((o
->flags
& SEC_RELOC
) != 0
8153 && elf_section_data (o
)->rel_hashes
!= NULL
)
8154 free (elf_section_data (o
)->rel_hashes
);
8160 /* Garbage collect unused sections. */
8162 /* The mark phase of garbage collection. For a given section, mark
8163 it and any sections in this section's group, and all the sections
8164 which define symbols to which it refers. */
8166 typedef asection
* (*gc_mark_hook_fn
)
8167 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8168 struct elf_link_hash_entry
*, Elf_Internal_Sym
*);
8171 elf_gc_mark (struct bfd_link_info
*info
,
8173 gc_mark_hook_fn gc_mark_hook
)
8176 asection
*group_sec
;
8180 /* Mark all the sections in the group. */
8181 group_sec
= elf_section_data (sec
)->next_in_group
;
8182 if (group_sec
&& !group_sec
->gc_mark
)
8183 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
8186 /* Look through the section relocs. */
8188 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
8190 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
8191 Elf_Internal_Shdr
*symtab_hdr
;
8192 struct elf_link_hash_entry
**sym_hashes
;
8195 bfd
*input_bfd
= sec
->owner
;
8196 const struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
8197 Elf_Internal_Sym
*isym
= NULL
;
8200 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
8201 sym_hashes
= elf_sym_hashes (input_bfd
);
8203 /* Read the local symbols. */
8204 if (elf_bad_symtab (input_bfd
))
8206 nlocsyms
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8210 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
8212 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8213 if (isym
== NULL
&& nlocsyms
!= 0)
8215 isym
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, nlocsyms
, 0,
8221 /* Read the relocations. */
8222 relstart
= _bfd_elf_link_read_relocs (input_bfd
, sec
, NULL
, NULL
,
8224 if (relstart
== NULL
)
8229 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8231 if (bed
->s
->arch_size
== 32)
8236 for (rel
= relstart
; rel
< relend
; rel
++)
8238 unsigned long r_symndx
;
8240 struct elf_link_hash_entry
*h
;
8242 r_symndx
= rel
->r_info
>> r_sym_shift
;
8246 if (r_symndx
>= nlocsyms
8247 || ELF_ST_BIND (isym
[r_symndx
].st_info
) != STB_LOCAL
)
8249 h
= sym_hashes
[r_symndx
- extsymoff
];
8250 while (h
->root
.type
== bfd_link_hash_indirect
8251 || h
->root
.type
== bfd_link_hash_warning
)
8252 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8253 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, h
, NULL
);
8257 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, NULL
, &isym
[r_symndx
]);
8260 if (rsec
&& !rsec
->gc_mark
)
8262 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
8264 else if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
8273 if (elf_section_data (sec
)->relocs
!= relstart
)
8276 if (isym
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isym
)
8278 if (! info
->keep_memory
)
8281 symtab_hdr
->contents
= (unsigned char *) isym
;
8288 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
8291 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *idxptr
)
8295 if (h
->root
.type
== bfd_link_hash_warning
)
8296 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8298 if (h
->dynindx
!= -1
8299 && ((h
->root
.type
!= bfd_link_hash_defined
8300 && h
->root
.type
!= bfd_link_hash_defweak
)
8301 || h
->root
.u
.def
.section
->gc_mark
))
8302 h
->dynindx
= (*idx
)++;
8307 /* The sweep phase of garbage collection. Remove all garbage sections. */
8309 typedef bfd_boolean (*gc_sweep_hook_fn
)
8310 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
8313 elf_gc_sweep (struct bfd_link_info
*info
, gc_sweep_hook_fn gc_sweep_hook
)
8317 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8321 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8324 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8326 /* Keep special sections. Keep .debug sections. */
8327 if ((o
->flags
& SEC_LINKER_CREATED
)
8328 || (o
->flags
& SEC_DEBUGGING
))
8334 /* Skip sweeping sections already excluded. */
8335 if (o
->flags
& SEC_EXCLUDE
)
8338 /* Since this is early in the link process, it is simple
8339 to remove a section from the output. */
8340 o
->flags
|= SEC_EXCLUDE
;
8342 /* But we also have to update some of the relocation
8343 info we collected before. */
8345 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
8347 Elf_Internal_Rela
*internal_relocs
;
8351 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
8353 if (internal_relocs
== NULL
)
8356 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
8358 if (elf_section_data (o
)->relocs
!= internal_relocs
)
8359 free (internal_relocs
);
8367 /* Remove the symbols that were in the swept sections from the dynamic
8368 symbol table. GCFIXME: Anyone know how to get them out of the
8369 static symbol table as well? */
8373 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
, &i
);
8375 elf_hash_table (info
)->dynsymcount
= i
;
8381 /* Propagate collected vtable information. This is called through
8382 elf_link_hash_traverse. */
8385 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
8387 if (h
->root
.type
== bfd_link_hash_warning
)
8388 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8390 /* Those that are not vtables. */
8391 if (h
->vtable_parent
== NULL
)
8394 /* Those vtables that do not have parents, we cannot merge. */
8395 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
8398 /* If we've already been done, exit. */
8399 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
8402 /* Make sure the parent's table is up to date. */
8403 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
8405 if (h
->vtable_entries_used
== NULL
)
8407 /* None of this table's entries were referenced. Re-use the
8409 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
8410 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
8415 bfd_boolean
*cu
, *pu
;
8417 /* Or the parent's entries into ours. */
8418 cu
= h
->vtable_entries_used
;
8420 pu
= h
->vtable_parent
->vtable_entries_used
;
8423 const struct elf_backend_data
*bed
;
8424 unsigned int log_file_align
;
8426 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
8427 log_file_align
= bed
->s
->log_file_align
;
8428 n
= h
->vtable_parent
->vtable_entries_size
>> log_file_align
;
8443 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
8446 bfd_vma hstart
, hend
;
8447 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
8448 const struct elf_backend_data
*bed
;
8449 unsigned int log_file_align
;
8451 if (h
->root
.type
== bfd_link_hash_warning
)
8452 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8454 /* Take care of both those symbols that do not describe vtables as
8455 well as those that are not loaded. */
8456 if (h
->vtable_parent
== NULL
)
8459 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
8460 || h
->root
.type
== bfd_link_hash_defweak
);
8462 sec
= h
->root
.u
.def
.section
;
8463 hstart
= h
->root
.u
.def
.value
;
8464 hend
= hstart
+ h
->size
;
8466 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
8468 return *(bfd_boolean
*) okp
= FALSE
;
8469 bed
= get_elf_backend_data (sec
->owner
);
8470 log_file_align
= bed
->s
->log_file_align
;
8472 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8474 for (rel
= relstart
; rel
< relend
; ++rel
)
8475 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
8477 /* If the entry is in use, do nothing. */
8478 if (h
->vtable_entries_used
8479 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
8481 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
8482 if (h
->vtable_entries_used
[entry
])
8485 /* Otherwise, kill it. */
8486 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
8492 /* Mark sections containing dynamically referenced symbols. This is called
8493 through elf_link_hash_traverse. */
8496 elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
,
8497 void *okp ATTRIBUTE_UNUSED
)
8499 if (h
->root
.type
== bfd_link_hash_warning
)
8500 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8502 if ((h
->root
.type
== bfd_link_hash_defined
8503 || h
->root
.type
== bfd_link_hash_defweak
)
8504 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
))
8505 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
8510 /* Do mark and sweep of unused sections. */
8513 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
8515 bfd_boolean ok
= TRUE
;
8517 asection
* (*gc_mark_hook
)
8518 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8519 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*);
8521 if (!get_elf_backend_data (abfd
)->can_gc_sections
8522 || info
->relocatable
8523 || info
->emitrelocations
8525 || !is_elf_hash_table (info
->hash
))
8527 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
8531 /* Apply transitive closure to the vtable entry usage info. */
8532 elf_link_hash_traverse (elf_hash_table (info
),
8533 elf_gc_propagate_vtable_entries_used
,
8538 /* Kill the vtable relocations that were not used. */
8539 elf_link_hash_traverse (elf_hash_table (info
),
8540 elf_gc_smash_unused_vtentry_relocs
,
8545 /* Mark dynamically referenced symbols. */
8546 if (elf_hash_table (info
)->dynamic_sections_created
)
8547 elf_link_hash_traverse (elf_hash_table (info
),
8548 elf_gc_mark_dynamic_ref_symbol
,
8553 /* Grovel through relocs to find out who stays ... */
8554 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
8555 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8559 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8562 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8564 if (o
->flags
& SEC_KEEP
)
8566 /* _bfd_elf_discard_section_eh_frame knows how to discard
8567 orphaned FDEs so don't mark sections referenced by the
8568 EH frame section. */
8569 if (strcmp (o
->name
, ".eh_frame") == 0)
8571 else if (!elf_gc_mark (info
, o
, gc_mark_hook
))
8577 /* ... and mark SEC_EXCLUDE for those that go. */
8578 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
8584 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
8587 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
8589 struct elf_link_hash_entry
*h
,
8592 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
8593 struct elf_link_hash_entry
**search
, *child
;
8594 bfd_size_type extsymcount
;
8595 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8598 /* The sh_info field of the symtab header tells us where the
8599 external symbols start. We don't care about the local symbols at
8601 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
8602 if (!elf_bad_symtab (abfd
))
8603 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
8605 sym_hashes
= elf_sym_hashes (abfd
);
8606 sym_hashes_end
= sym_hashes
+ extsymcount
;
8608 /* Hunt down the child symbol, which is in this section at the same
8609 offset as the relocation. */
8610 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
8612 if ((child
= *search
) != NULL
8613 && (child
->root
.type
== bfd_link_hash_defined
8614 || child
->root
.type
== bfd_link_hash_defweak
)
8615 && child
->root
.u
.def
.section
== sec
8616 && child
->root
.u
.def
.value
== offset
)
8620 sec_name
= bfd_get_section_ident (sec
);
8621 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
8622 bfd_archive_filename (abfd
),
8623 sec_name
? sec_name
: sec
->name
,
8624 (unsigned long) offset
);
8625 bfd_set_error (bfd_error_invalid_operation
);
8631 /* This *should* only be the absolute section. It could potentially
8632 be that someone has defined a non-global vtable though, which
8633 would be bad. It isn't worth paging in the local symbols to be
8634 sure though; that case should simply be handled by the assembler. */
8636 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
8639 child
->vtable_parent
= h
;
8644 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
8647 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
8648 asection
*sec ATTRIBUTE_UNUSED
,
8649 struct elf_link_hash_entry
*h
,
8652 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8653 unsigned int log_file_align
= bed
->s
->log_file_align
;
8655 if (addend
>= h
->vtable_entries_size
)
8657 size_t size
, bytes
, file_align
;
8658 bfd_boolean
*ptr
= h
->vtable_entries_used
;
8660 /* While the symbol is undefined, we have to be prepared to handle
8662 file_align
= 1 << log_file_align
;
8663 if (h
->root
.type
== bfd_link_hash_undefined
)
8664 size
= addend
+ file_align
;
8670 /* Oops! We've got a reference past the defined end of
8671 the table. This is probably a bug -- shall we warn? */
8672 size
= addend
+ file_align
;
8675 size
= (size
+ file_align
- 1) & -file_align
;
8677 /* Allocate one extra entry for use as a "done" flag for the
8678 consolidation pass. */
8679 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
8683 ptr
= bfd_realloc (ptr
- 1, bytes
);
8689 oldbytes
= (((h
->vtable_entries_size
>> log_file_align
) + 1)
8690 * sizeof (bfd_boolean
));
8691 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
8695 ptr
= bfd_zmalloc (bytes
);
8700 /* And arrange for that done flag to be at index -1. */
8701 h
->vtable_entries_used
= ptr
+ 1;
8702 h
->vtable_entries_size
= size
;
8705 h
->vtable_entries_used
[addend
>> log_file_align
] = TRUE
;
8710 struct alloc_got_off_arg
{
8712 unsigned int got_elt_size
;
8715 /* We need a special top-level link routine to convert got reference counts
8716 to real got offsets. */
8719 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
8721 struct alloc_got_off_arg
*gofarg
= arg
;
8723 if (h
->root
.type
== bfd_link_hash_warning
)
8724 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8726 if (h
->got
.refcount
> 0)
8728 h
->got
.offset
= gofarg
->gotoff
;
8729 gofarg
->gotoff
+= gofarg
->got_elt_size
;
8732 h
->got
.offset
= (bfd_vma
) -1;
8737 /* And an accompanying bit to work out final got entry offsets once
8738 we're done. Should be called from final_link. */
8741 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
8742 struct bfd_link_info
*info
)
8745 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8747 unsigned int got_elt_size
= bed
->s
->arch_size
/ 8;
8748 struct alloc_got_off_arg gofarg
;
8750 if (! is_elf_hash_table (info
->hash
))
8753 /* The GOT offset is relative to the .got section, but the GOT header is
8754 put into the .got.plt section, if the backend uses it. */
8755 if (bed
->want_got_plt
)
8758 gotoff
= bed
->got_header_size
;
8760 /* Do the local .got entries first. */
8761 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
8763 bfd_signed_vma
*local_got
;
8764 bfd_size_type j
, locsymcount
;
8765 Elf_Internal_Shdr
*symtab_hdr
;
8767 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
8770 local_got
= elf_local_got_refcounts (i
);
8774 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
8775 if (elf_bad_symtab (i
))
8776 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8778 locsymcount
= symtab_hdr
->sh_info
;
8780 for (j
= 0; j
< locsymcount
; ++j
)
8782 if (local_got
[j
] > 0)
8784 local_got
[j
] = gotoff
;
8785 gotoff
+= got_elt_size
;
8788 local_got
[j
] = (bfd_vma
) -1;
8792 /* Then the global .got entries. .plt refcounts are handled by
8793 adjust_dynamic_symbol */
8794 gofarg
.gotoff
= gotoff
;
8795 gofarg
.got_elt_size
= got_elt_size
;
8796 elf_link_hash_traverse (elf_hash_table (info
),
8797 elf_gc_allocate_got_offsets
,
8802 /* Many folk need no more in the way of final link than this, once
8803 got entry reference counting is enabled. */
8806 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
8808 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
8811 /* Invoke the regular ELF backend linker to do all the work. */
8812 return bfd_elf_final_link (abfd
, info
);
8816 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
8818 struct elf_reloc_cookie
*rcookie
= cookie
;
8820 if (rcookie
->bad_symtab
)
8821 rcookie
->rel
= rcookie
->rels
;
8823 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8825 unsigned long r_symndx
;
8827 if (! rcookie
->bad_symtab
)
8828 if (rcookie
->rel
->r_offset
> offset
)
8830 if (rcookie
->rel
->r_offset
!= offset
)
8833 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
8834 if (r_symndx
== SHN_UNDEF
)
8837 if (r_symndx
>= rcookie
->locsymcount
8838 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
8840 struct elf_link_hash_entry
*h
;
8842 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8844 while (h
->root
.type
== bfd_link_hash_indirect
8845 || h
->root
.type
== bfd_link_hash_warning
)
8846 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8848 if ((h
->root
.type
== bfd_link_hash_defined
8849 || h
->root
.type
== bfd_link_hash_defweak
)
8850 && elf_discarded_section (h
->root
.u
.def
.section
))
8857 /* It's not a relocation against a global symbol,
8858 but it could be a relocation against a local
8859 symbol for a discarded section. */
8861 Elf_Internal_Sym
*isym
;
8863 /* Need to: get the symbol; get the section. */
8864 isym
= &rcookie
->locsyms
[r_symndx
];
8865 if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
8867 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
8868 if (isec
!= NULL
&& elf_discarded_section (isec
))
8877 /* Discard unneeded references to discarded sections.
8878 Returns TRUE if any section's size was changed. */
8879 /* This function assumes that the relocations are in sorted order,
8880 which is true for all known assemblers. */
8883 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
8885 struct elf_reloc_cookie cookie
;
8886 asection
*stab
, *eh
;
8887 Elf_Internal_Shdr
*symtab_hdr
;
8888 const struct elf_backend_data
*bed
;
8891 bfd_boolean ret
= FALSE
;
8893 if (info
->traditional_format
8894 || !is_elf_hash_table (info
->hash
))
8897 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8899 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8902 bed
= get_elf_backend_data (abfd
);
8904 if ((abfd
->flags
& DYNAMIC
) != 0)
8907 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8908 if (info
->relocatable
8911 || bfd_is_abs_section (eh
->output_section
))))
8914 stab
= bfd_get_section_by_name (abfd
, ".stab");
8917 || bfd_is_abs_section (stab
->output_section
)
8918 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
8923 && bed
->elf_backend_discard_info
== NULL
)
8926 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8928 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
8929 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
8930 if (cookie
.bad_symtab
)
8932 cookie
.locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8933 cookie
.extsymoff
= 0;
8937 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8938 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8941 if (bed
->s
->arch_size
== 32)
8942 cookie
.r_sym_shift
= 8;
8944 cookie
.r_sym_shift
= 32;
8946 cookie
.locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8947 if (cookie
.locsyms
== NULL
&& cookie
.locsymcount
!= 0)
8949 cookie
.locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
8950 cookie
.locsymcount
, 0,
8952 if (cookie
.locsyms
== NULL
)
8959 count
= stab
->reloc_count
;
8961 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, stab
, NULL
, NULL
,
8963 if (cookie
.rels
!= NULL
)
8965 cookie
.rel
= cookie
.rels
;
8966 cookie
.relend
= cookie
.rels
;
8967 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
8968 if (_bfd_discard_section_stabs (abfd
, stab
,
8969 elf_section_data (stab
)->sec_info
,
8970 bfd_elf_reloc_symbol_deleted_p
,
8973 if (elf_section_data (stab
)->relocs
!= cookie
.rels
)
8981 count
= eh
->reloc_count
;
8983 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, eh
, NULL
, NULL
,
8985 cookie
.rel
= cookie
.rels
;
8986 cookie
.relend
= cookie
.rels
;
8987 if (cookie
.rels
!= NULL
)
8988 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
8990 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
8991 bfd_elf_reloc_symbol_deleted_p
,
8995 if (cookie
.rels
!= NULL
8996 && elf_section_data (eh
)->relocs
!= cookie
.rels
)
9000 if (bed
->elf_backend_discard_info
!= NULL
9001 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
9004 if (cookie
.locsyms
!= NULL
9005 && symtab_hdr
->contents
!= (unsigned char *) cookie
.locsyms
)
9007 if (! info
->keep_memory
)
9008 free (cookie
.locsyms
);
9010 symtab_hdr
->contents
= (unsigned char *) cookie
.locsyms
;
9014 if (info
->eh_frame_hdr
9015 && !info
->relocatable
9016 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))