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
->_raw_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 (*_bfd_error_handler
)
1863 (_("%s: bad reloc symbol index (0x%lx >= 0x%lx) for offset 0x%lx in section `%s'"),
1864 bfd_archive_filename (abfd
), (unsigned long) r_symndx
,
1865 (unsigned long) nsyms
, irela
->r_offset
, sec
->name
);
1866 bfd_set_error (bfd_error_bad_value
);
1869 irela
+= bed
->s
->int_rels_per_ext_rel
;
1870 erela
+= shdr
->sh_entsize
;
1876 /* Read and swap the relocs for a section O. They may have been
1877 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
1878 not NULL, they are used as buffers to read into. They are known to
1879 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
1880 the return value is allocated using either malloc or bfd_alloc,
1881 according to the KEEP_MEMORY argument. If O has two relocation
1882 sections (both REL and RELA relocations), then the REL_HDR
1883 relocations will appear first in INTERNAL_RELOCS, followed by the
1884 REL_HDR2 relocations. */
1887 _bfd_elf_link_read_relocs (bfd
*abfd
,
1889 void *external_relocs
,
1890 Elf_Internal_Rela
*internal_relocs
,
1891 bfd_boolean keep_memory
)
1893 Elf_Internal_Shdr
*rel_hdr
;
1894 void *alloc1
= NULL
;
1895 Elf_Internal_Rela
*alloc2
= NULL
;
1896 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1898 if (elf_section_data (o
)->relocs
!= NULL
)
1899 return elf_section_data (o
)->relocs
;
1901 if (o
->reloc_count
== 0)
1904 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1906 if (internal_relocs
== NULL
)
1910 size
= o
->reloc_count
;
1911 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
1913 internal_relocs
= bfd_alloc (abfd
, size
);
1915 internal_relocs
= alloc2
= bfd_malloc (size
);
1916 if (internal_relocs
== NULL
)
1920 if (external_relocs
== NULL
)
1922 bfd_size_type size
= rel_hdr
->sh_size
;
1924 if (elf_section_data (o
)->rel_hdr2
)
1925 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
1926 alloc1
= bfd_malloc (size
);
1929 external_relocs
= alloc1
;
1932 if (!elf_link_read_relocs_from_section (abfd
, o
, rel_hdr
,
1936 if (elf_section_data (o
)->rel_hdr2
1937 && (!elf_link_read_relocs_from_section
1939 elf_section_data (o
)->rel_hdr2
,
1940 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
1941 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
1942 * bed
->s
->int_rels_per_ext_rel
))))
1945 /* Cache the results for next time, if we can. */
1947 elf_section_data (o
)->relocs
= internal_relocs
;
1952 /* Don't free alloc2, since if it was allocated we are passing it
1953 back (under the name of internal_relocs). */
1955 return internal_relocs
;
1965 /* Compute the size of, and allocate space for, REL_HDR which is the
1966 section header for a section containing relocations for O. */
1969 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
1970 Elf_Internal_Shdr
*rel_hdr
,
1973 bfd_size_type reloc_count
;
1974 bfd_size_type num_rel_hashes
;
1976 /* Figure out how many relocations there will be. */
1977 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
1978 reloc_count
= elf_section_data (o
)->rel_count
;
1980 reloc_count
= elf_section_data (o
)->rel_count2
;
1982 num_rel_hashes
= o
->reloc_count
;
1983 if (num_rel_hashes
< reloc_count
)
1984 num_rel_hashes
= reloc_count
;
1986 /* That allows us to calculate the size of the section. */
1987 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
1989 /* The contents field must last into write_object_contents, so we
1990 allocate it with bfd_alloc rather than malloc. Also since we
1991 cannot be sure that the contents will actually be filled in,
1992 we zero the allocated space. */
1993 rel_hdr
->contents
= bfd_zalloc (abfd
, rel_hdr
->sh_size
);
1994 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
1997 /* We only allocate one set of hash entries, so we only do it the
1998 first time we are called. */
1999 if (elf_section_data (o
)->rel_hashes
== NULL
2002 struct elf_link_hash_entry
**p
;
2004 p
= bfd_zmalloc (num_rel_hashes
* sizeof (struct elf_link_hash_entry
*));
2008 elf_section_data (o
)->rel_hashes
= p
;
2014 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2015 originated from the section given by INPUT_REL_HDR) to the
2019 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2020 asection
*input_section
,
2021 Elf_Internal_Shdr
*input_rel_hdr
,
2022 Elf_Internal_Rela
*internal_relocs
)
2024 Elf_Internal_Rela
*irela
;
2025 Elf_Internal_Rela
*irelaend
;
2027 Elf_Internal_Shdr
*output_rel_hdr
;
2028 asection
*output_section
;
2029 unsigned int *rel_countp
= NULL
;
2030 const struct elf_backend_data
*bed
;
2031 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2033 output_section
= input_section
->output_section
;
2034 output_rel_hdr
= NULL
;
2036 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
2037 == input_rel_hdr
->sh_entsize
)
2039 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
2040 rel_countp
= &elf_section_data (output_section
)->rel_count
;
2042 else if (elf_section_data (output_section
)->rel_hdr2
2043 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
2044 == input_rel_hdr
->sh_entsize
))
2046 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
2047 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
2051 (*_bfd_error_handler
)
2052 (_("%s: relocation size mismatch in %s section %s"),
2053 bfd_get_filename (output_bfd
),
2054 bfd_archive_filename (input_section
->owner
),
2055 input_section
->name
);
2056 bfd_set_error (bfd_error_wrong_object_format
);
2060 bed
= get_elf_backend_data (output_bfd
);
2061 if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2062 swap_out
= bed
->s
->swap_reloc_out
;
2063 else if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2064 swap_out
= bed
->s
->swap_reloca_out
;
2068 erel
= output_rel_hdr
->contents
;
2069 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
2070 irela
= internal_relocs
;
2071 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2072 * bed
->s
->int_rels_per_ext_rel
);
2073 while (irela
< irelaend
)
2075 (*swap_out
) (output_bfd
, irela
, erel
);
2076 irela
+= bed
->s
->int_rels_per_ext_rel
;
2077 erel
+= input_rel_hdr
->sh_entsize
;
2080 /* Bump the counter, so that we know where to add the next set of
2082 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2087 /* Fix up the flags for a symbol. This handles various cases which
2088 can only be fixed after all the input files are seen. This is
2089 currently called by both adjust_dynamic_symbol and
2090 assign_sym_version, which is unnecessary but perhaps more robust in
2091 the face of future changes. */
2094 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2095 struct elf_info_failed
*eif
)
2097 /* If this symbol was mentioned in a non-ELF file, try to set
2098 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2099 permit a non-ELF file to correctly refer to a symbol defined in
2100 an ELF dynamic object. */
2101 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2103 while (h
->root
.type
== bfd_link_hash_indirect
)
2104 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2106 if (h
->root
.type
!= bfd_link_hash_defined
2107 && h
->root
.type
!= bfd_link_hash_defweak
)
2108 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
2109 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
2112 if (h
->root
.u
.def
.section
->owner
!= NULL
2113 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2114 == bfd_target_elf_flavour
))
2115 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
2116 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
2118 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2121 if (h
->dynindx
== -1
2122 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2123 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2125 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2134 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
2135 was first seen in a non-ELF file. Fortunately, if the symbol
2136 was first seen in an ELF file, we're probably OK unless the
2137 symbol was defined in a non-ELF file. Catch that case here.
2138 FIXME: We're still in trouble if the symbol was first seen in
2139 a dynamic object, and then later in a non-ELF regular object. */
2140 if ((h
->root
.type
== bfd_link_hash_defined
2141 || h
->root
.type
== bfd_link_hash_defweak
)
2142 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2143 && (h
->root
.u
.def
.section
->owner
!= NULL
2144 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2145 != bfd_target_elf_flavour
)
2146 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2147 && (h
->elf_link_hash_flags
2148 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
2149 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2152 /* If this is a final link, and the symbol was defined as a common
2153 symbol in a regular object file, and there was no definition in
2154 any dynamic object, then the linker will have allocated space for
2155 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2156 flag will not have been set. */
2157 if (h
->root
.type
== bfd_link_hash_defined
2158 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2159 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2160 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2161 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2162 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2164 /* If -Bsymbolic was used (which means to bind references to global
2165 symbols to the definition within the shared object), and this
2166 symbol was defined in a regular object, then it actually doesn't
2167 need a PLT entry. Likewise, if the symbol has non-default
2168 visibility. If the symbol has hidden or internal visibility, we
2169 will force it local. */
2170 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2171 && eif
->info
->shared
2172 && is_elf_hash_table (eif
->info
->hash
)
2173 && (eif
->info
->symbolic
2174 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2175 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2177 const struct elf_backend_data
*bed
;
2178 bfd_boolean force_local
;
2180 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2182 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2183 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2184 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2187 /* If a weak undefined symbol has non-default visibility, we also
2188 hide it from the dynamic linker. */
2189 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2190 && h
->root
.type
== bfd_link_hash_undefweak
)
2192 const struct elf_backend_data
*bed
;
2193 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2194 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2197 /* If this is a weak defined symbol in a dynamic object, and we know
2198 the real definition in the dynamic object, copy interesting flags
2199 over to the real definition. */
2200 if (h
->weakdef
!= NULL
)
2202 struct elf_link_hash_entry
*weakdef
;
2204 weakdef
= h
->weakdef
;
2205 if (h
->root
.type
== bfd_link_hash_indirect
)
2206 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2208 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2209 || h
->root
.type
== bfd_link_hash_defweak
);
2210 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2211 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2212 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2214 /* If the real definition is defined by a regular object file,
2215 don't do anything special. See the longer description in
2216 _bfd_elf_adjust_dynamic_symbol, below. */
2217 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2221 const struct elf_backend_data
*bed
;
2223 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2224 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, weakdef
, h
);
2231 /* Make the backend pick a good value for a dynamic symbol. This is
2232 called via elf_link_hash_traverse, and also calls itself
2236 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2238 struct elf_info_failed
*eif
= data
;
2240 const struct elf_backend_data
*bed
;
2242 if (! is_elf_hash_table (eif
->info
->hash
))
2245 if (h
->root
.type
== bfd_link_hash_warning
)
2247 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
2248 h
->got
= elf_hash_table (eif
->info
)->init_offset
;
2250 /* When warning symbols are created, they **replace** the "real"
2251 entry in the hash table, thus we never get to see the real
2252 symbol in a hash traversal. So look at it now. */
2253 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2256 /* Ignore indirect symbols. These are added by the versioning code. */
2257 if (h
->root
.type
== bfd_link_hash_indirect
)
2260 /* Fix the symbol flags. */
2261 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2264 /* If this symbol does not require a PLT entry, and it is not
2265 defined by a dynamic object, or is not referenced by a regular
2266 object, ignore it. We do have to handle a weak defined symbol,
2267 even if no regular object refers to it, if we decided to add it
2268 to the dynamic symbol table. FIXME: Do we normally need to worry
2269 about symbols which are defined by one dynamic object and
2270 referenced by another one? */
2271 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2272 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2273 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2274 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2275 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2277 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
2281 /* If we've already adjusted this symbol, don't do it again. This
2282 can happen via a recursive call. */
2283 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2286 /* Don't look at this symbol again. Note that we must set this
2287 after checking the above conditions, because we may look at a
2288 symbol once, decide not to do anything, and then get called
2289 recursively later after REF_REGULAR is set below. */
2290 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2292 /* If this is a weak definition, and we know a real definition, and
2293 the real symbol is not itself defined by a regular object file,
2294 then get a good value for the real definition. We handle the
2295 real symbol first, for the convenience of the backend routine.
2297 Note that there is a confusing case here. If the real definition
2298 is defined by a regular object file, we don't get the real symbol
2299 from the dynamic object, but we do get the weak symbol. If the
2300 processor backend uses a COPY reloc, then if some routine in the
2301 dynamic object changes the real symbol, we will not see that
2302 change in the corresponding weak symbol. This is the way other
2303 ELF linkers work as well, and seems to be a result of the shared
2306 I will clarify this issue. Most SVR4 shared libraries define the
2307 variable _timezone and define timezone as a weak synonym. The
2308 tzset call changes _timezone. If you write
2309 extern int timezone;
2311 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2312 you might expect that, since timezone is a synonym for _timezone,
2313 the same number will print both times. However, if the processor
2314 backend uses a COPY reloc, then actually timezone will be copied
2315 into your process image, and, since you define _timezone
2316 yourself, _timezone will not. Thus timezone and _timezone will
2317 wind up at different memory locations. The tzset call will set
2318 _timezone, leaving timezone unchanged. */
2320 if (h
->weakdef
!= NULL
)
2322 /* If we get to this point, we know there is an implicit
2323 reference by a regular object file via the weak symbol H.
2324 FIXME: Is this really true? What if the traversal finds
2325 H->WEAKDEF before it finds H? */
2326 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2328 if (! _bfd_elf_adjust_dynamic_symbol (h
->weakdef
, eif
))
2332 /* If a symbol has no type and no size and does not require a PLT
2333 entry, then we are probably about to do the wrong thing here: we
2334 are probably going to create a COPY reloc for an empty object.
2335 This case can arise when a shared object is built with assembly
2336 code, and the assembly code fails to set the symbol type. */
2338 && h
->type
== STT_NOTYPE
2339 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
2340 (*_bfd_error_handler
)
2341 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2342 h
->root
.root
.string
);
2344 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2345 bed
= get_elf_backend_data (dynobj
);
2346 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2355 /* Adjust all external symbols pointing into SEC_MERGE sections
2356 to reflect the object merging within the sections. */
2359 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2363 if (h
->root
.type
== bfd_link_hash_warning
)
2364 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2366 if ((h
->root
.type
== bfd_link_hash_defined
2367 || h
->root
.type
== bfd_link_hash_defweak
)
2368 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2369 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2371 bfd
*output_bfd
= data
;
2373 h
->root
.u
.def
.value
=
2374 _bfd_merged_section_offset (output_bfd
,
2375 &h
->root
.u
.def
.section
,
2376 elf_section_data (sec
)->sec_info
,
2377 h
->root
.u
.def
.value
);
2383 /* Returns false if the symbol referred to by H should be considered
2384 to resolve local to the current module, and true if it should be
2385 considered to bind dynamically. */
2388 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2389 struct bfd_link_info
*info
,
2390 bfd_boolean ignore_protected
)
2392 bfd_boolean binding_stays_local_p
;
2397 while (h
->root
.type
== bfd_link_hash_indirect
2398 || h
->root
.type
== bfd_link_hash_warning
)
2399 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2401 /* If it was forced local, then clearly it's not dynamic. */
2402 if (h
->dynindx
== -1)
2404 if (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
)
2407 /* Identify the cases where name binding rules say that a
2408 visible symbol resolves locally. */
2409 binding_stays_local_p
= info
->executable
|| info
->symbolic
;
2411 switch (ELF_ST_VISIBILITY (h
->other
))
2418 /* Proper resolution for function pointer equality may require
2419 that these symbols perhaps be resolved dynamically, even though
2420 we should be resolving them to the current module. */
2421 if (!ignore_protected
)
2422 binding_stays_local_p
= TRUE
;
2429 /* If it isn't defined locally, then clearly it's dynamic. */
2430 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2433 /* Otherwise, the symbol is dynamic if binding rules don't tell
2434 us that it remains local. */
2435 return !binding_stays_local_p
;
2438 /* Return true if the symbol referred to by H should be considered
2439 to resolve local to the current module, and false otherwise. Differs
2440 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2441 undefined symbols and weak symbols. */
2444 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2445 struct bfd_link_info
*info
,
2446 bfd_boolean local_protected
)
2448 /* If it's a local sym, of course we resolve locally. */
2452 /* If we don't have a definition in a regular file, then we can't
2453 resolve locally. The sym is either undefined or dynamic. */
2454 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2457 /* Forced local symbols resolve locally. */
2458 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
2461 /* As do non-dynamic symbols. */
2462 if (h
->dynindx
== -1)
2465 /* At this point, we know the symbol is defined and dynamic. In an
2466 executable it must resolve locally, likewise when building symbolic
2467 shared libraries. */
2468 if (info
->executable
|| info
->symbolic
)
2471 /* Now deal with defined dynamic symbols in shared libraries. Ones
2472 with default visibility might not resolve locally. */
2473 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2476 /* However, STV_HIDDEN or STV_INTERNAL ones must be local. */
2477 if (ELF_ST_VISIBILITY (h
->other
) != STV_PROTECTED
)
2480 /* Function pointer equality tests may require that STV_PROTECTED
2481 symbols be treated as dynamic symbols, even when we know that the
2482 dynamic linker will resolve them locally. */
2483 return local_protected
;
2486 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2487 aligned. Returns the first TLS output section. */
2489 struct bfd_section
*
2490 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2492 struct bfd_section
*sec
, *tls
;
2493 unsigned int align
= 0;
2495 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2496 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2500 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2501 if (sec
->alignment_power
> align
)
2502 align
= sec
->alignment_power
;
2504 elf_hash_table (info
)->tls_sec
= tls
;
2506 /* Ensure the alignment of the first section is the largest alignment,
2507 so that the tls segment starts aligned. */
2509 tls
->alignment_power
= align
;
2514 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2516 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2517 Elf_Internal_Sym
*sym
)
2519 /* Local symbols do not count, but target specific ones might. */
2520 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2521 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2524 /* Function symbols do not count. */
2525 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
2528 /* If the section is undefined, then so is the symbol. */
2529 if (sym
->st_shndx
== SHN_UNDEF
)
2532 /* If the symbol is defined in the common section, then
2533 it is a common definition and so does not count. */
2534 if (sym
->st_shndx
== SHN_COMMON
)
2537 /* If the symbol is in a target specific section then we
2538 must rely upon the backend to tell us what it is. */
2539 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2540 /* FIXME - this function is not coded yet:
2542 return _bfd_is_global_symbol_definition (abfd, sym);
2544 Instead for now assume that the definition is not global,
2545 Even if this is wrong, at least the linker will behave
2546 in the same way that it used to do. */
2552 /* Search the symbol table of the archive element of the archive ABFD
2553 whose archive map contains a mention of SYMDEF, and determine if
2554 the symbol is defined in this element. */
2556 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2558 Elf_Internal_Shdr
* hdr
;
2559 bfd_size_type symcount
;
2560 bfd_size_type extsymcount
;
2561 bfd_size_type extsymoff
;
2562 Elf_Internal_Sym
*isymbuf
;
2563 Elf_Internal_Sym
*isym
;
2564 Elf_Internal_Sym
*isymend
;
2567 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2571 if (! bfd_check_format (abfd
, bfd_object
))
2574 /* If we have already included the element containing this symbol in the
2575 link then we do not need to include it again. Just claim that any symbol
2576 it contains is not a definition, so that our caller will not decide to
2577 (re)include this element. */
2578 if (abfd
->archive_pass
)
2581 /* Select the appropriate symbol table. */
2582 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2583 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2585 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2587 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2589 /* The sh_info field of the symtab header tells us where the
2590 external symbols start. We don't care about the local symbols. */
2591 if (elf_bad_symtab (abfd
))
2593 extsymcount
= symcount
;
2598 extsymcount
= symcount
- hdr
->sh_info
;
2599 extsymoff
= hdr
->sh_info
;
2602 if (extsymcount
== 0)
2605 /* Read in the symbol table. */
2606 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
2608 if (isymbuf
== NULL
)
2611 /* Scan the symbol table looking for SYMDEF. */
2613 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
2617 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
2622 if (strcmp (name
, symdef
->name
) == 0)
2624 result
= is_global_data_symbol_definition (abfd
, isym
);
2634 /* Add an entry to the .dynamic table. */
2637 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
2641 struct elf_link_hash_table
*hash_table
;
2642 const struct elf_backend_data
*bed
;
2644 bfd_size_type newsize
;
2645 bfd_byte
*newcontents
;
2646 Elf_Internal_Dyn dyn
;
2648 hash_table
= elf_hash_table (info
);
2649 if (! is_elf_hash_table (hash_table
))
2652 bed
= get_elf_backend_data (hash_table
->dynobj
);
2653 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
2654 BFD_ASSERT (s
!= NULL
);
2656 newsize
= s
->_raw_size
+ bed
->s
->sizeof_dyn
;
2657 newcontents
= bfd_realloc (s
->contents
, newsize
);
2658 if (newcontents
== NULL
)
2662 dyn
.d_un
.d_val
= val
;
2663 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->_raw_size
);
2665 s
->_raw_size
= newsize
;
2666 s
->contents
= newcontents
;
2671 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
2672 otherwise just check whether one already exists. Returns -1 on error,
2673 1 if a DT_NEEDED tag already exists, and 0 on success. */
2676 elf_add_dt_needed_tag (struct bfd_link_info
*info
,
2680 struct elf_link_hash_table
*hash_table
;
2681 bfd_size_type oldsize
;
2682 bfd_size_type strindex
;
2684 hash_table
= elf_hash_table (info
);
2685 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2686 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
2687 if (strindex
== (bfd_size_type
) -1)
2690 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2693 const struct elf_backend_data
*bed
;
2696 bed
= get_elf_backend_data (hash_table
->dynobj
);
2697 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
2698 BFD_ASSERT (sdyn
!= NULL
);
2700 for (extdyn
= sdyn
->contents
;
2701 extdyn
< sdyn
->contents
+ sdyn
->_raw_size
;
2702 extdyn
+= bed
->s
->sizeof_dyn
)
2704 Elf_Internal_Dyn dyn
;
2706 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
2707 if (dyn
.d_tag
== DT_NEEDED
2708 && dyn
.d_un
.d_val
== strindex
)
2710 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
2718 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
2722 /* We were just checking for existence of the tag. */
2723 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
2728 /* Sort symbol by value and section. */
2730 elf_sort_symbol (const void *arg1
, const void *arg2
)
2732 const struct elf_link_hash_entry
*h1
;
2733 const struct elf_link_hash_entry
*h2
;
2734 bfd_signed_vma vdiff
;
2736 h1
= *(const struct elf_link_hash_entry
**) arg1
;
2737 h2
= *(const struct elf_link_hash_entry
**) arg2
;
2738 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
2740 return vdiff
> 0 ? 1 : -1;
2743 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
2745 return sdiff
> 0 ? 1 : -1;
2750 /* This function is used to adjust offsets into .dynstr for
2751 dynamic symbols. This is called via elf_link_hash_traverse. */
2754 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
2756 struct elf_strtab_hash
*dynstr
= data
;
2758 if (h
->root
.type
== bfd_link_hash_warning
)
2759 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2761 if (h
->dynindx
!= -1)
2762 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
2766 /* Assign string offsets in .dynstr, update all structures referencing
2770 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
2772 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
2773 struct elf_link_local_dynamic_entry
*entry
;
2774 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
2775 bfd
*dynobj
= hash_table
->dynobj
;
2778 const struct elf_backend_data
*bed
;
2781 _bfd_elf_strtab_finalize (dynstr
);
2782 size
= _bfd_elf_strtab_size (dynstr
);
2784 bed
= get_elf_backend_data (dynobj
);
2785 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2786 BFD_ASSERT (sdyn
!= NULL
);
2788 /* Update all .dynamic entries referencing .dynstr strings. */
2789 for (extdyn
= sdyn
->contents
;
2790 extdyn
< sdyn
->contents
+ sdyn
->_raw_size
;
2791 extdyn
+= bed
->s
->sizeof_dyn
)
2793 Elf_Internal_Dyn dyn
;
2795 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
2799 dyn
.d_un
.d_val
= size
;
2807 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
2812 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
2815 /* Now update local dynamic symbols. */
2816 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
2817 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
2818 entry
->isym
.st_name
);
2820 /* And the rest of dynamic symbols. */
2821 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
2823 /* Adjust version definitions. */
2824 if (elf_tdata (output_bfd
)->cverdefs
)
2829 Elf_Internal_Verdef def
;
2830 Elf_Internal_Verdaux defaux
;
2832 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2836 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
2838 p
+= sizeof (Elf_External_Verdef
);
2839 for (i
= 0; i
< def
.vd_cnt
; ++i
)
2841 _bfd_elf_swap_verdaux_in (output_bfd
,
2842 (Elf_External_Verdaux
*) p
, &defaux
);
2843 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
2845 _bfd_elf_swap_verdaux_out (output_bfd
,
2846 &defaux
, (Elf_External_Verdaux
*) p
);
2847 p
+= sizeof (Elf_External_Verdaux
);
2850 while (def
.vd_next
);
2853 /* Adjust version references. */
2854 if (elf_tdata (output_bfd
)->verref
)
2859 Elf_Internal_Verneed need
;
2860 Elf_Internal_Vernaux needaux
;
2862 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2866 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
2868 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
2869 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
2870 (Elf_External_Verneed
*) p
);
2871 p
+= sizeof (Elf_External_Verneed
);
2872 for (i
= 0; i
< need
.vn_cnt
; ++i
)
2874 _bfd_elf_swap_vernaux_in (output_bfd
,
2875 (Elf_External_Vernaux
*) p
, &needaux
);
2876 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
2878 _bfd_elf_swap_vernaux_out (output_bfd
,
2880 (Elf_External_Vernaux
*) p
);
2881 p
+= sizeof (Elf_External_Vernaux
);
2884 while (need
.vn_next
);
2890 /* Add symbols from an ELF object file to the linker hash table. */
2893 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
2895 bfd_boolean (*add_symbol_hook
)
2896 (bfd
*, struct bfd_link_info
*, Elf_Internal_Sym
*,
2897 const char **, flagword
*, asection
**, bfd_vma
*);
2898 bfd_boolean (*check_relocs
)
2899 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
2900 bfd_boolean collect
;
2901 Elf_Internal_Shdr
*hdr
;
2902 bfd_size_type symcount
;
2903 bfd_size_type extsymcount
;
2904 bfd_size_type extsymoff
;
2905 struct elf_link_hash_entry
**sym_hash
;
2906 bfd_boolean dynamic
;
2907 Elf_External_Versym
*extversym
= NULL
;
2908 Elf_External_Versym
*ever
;
2909 struct elf_link_hash_entry
*weaks
;
2910 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
2911 bfd_size_type nondeflt_vers_cnt
= 0;
2912 Elf_Internal_Sym
*isymbuf
= NULL
;
2913 Elf_Internal_Sym
*isym
;
2914 Elf_Internal_Sym
*isymend
;
2915 const struct elf_backend_data
*bed
;
2916 bfd_boolean add_needed
;
2917 struct elf_link_hash_table
* hash_table
;
2920 hash_table
= elf_hash_table (info
);
2922 bed
= get_elf_backend_data (abfd
);
2923 add_symbol_hook
= bed
->elf_add_symbol_hook
;
2924 collect
= bed
->collect
;
2926 if ((abfd
->flags
& DYNAMIC
) == 0)
2932 /* You can't use -r against a dynamic object. Also, there's no
2933 hope of using a dynamic object which does not exactly match
2934 the format of the output file. */
2935 if (info
->relocatable
2936 || !is_elf_hash_table (hash_table
)
2937 || hash_table
->root
.creator
!= abfd
->xvec
)
2939 bfd_set_error (bfd_error_invalid_operation
);
2944 /* As a GNU extension, any input sections which are named
2945 .gnu.warning.SYMBOL are treated as warning symbols for the given
2946 symbol. This differs from .gnu.warning sections, which generate
2947 warnings when they are included in an output file. */
2948 if (info
->executable
)
2952 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2956 name
= bfd_get_section_name (abfd
, s
);
2957 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
2961 bfd_size_type prefix_len
;
2962 const char * gnu_warning_prefix
= _("warning: ");
2964 name
+= sizeof ".gnu.warning." - 1;
2966 /* If this is a shared object, then look up the symbol
2967 in the hash table. If it is there, and it is already
2968 been defined, then we will not be using the entry
2969 from this shared object, so we don't need to warn.
2970 FIXME: If we see the definition in a regular object
2971 later on, we will warn, but we shouldn't. The only
2972 fix is to keep track of what warnings we are supposed
2973 to emit, and then handle them all at the end of the
2977 struct elf_link_hash_entry
*h
;
2979 h
= elf_link_hash_lookup (hash_table
, name
,
2980 FALSE
, FALSE
, TRUE
);
2982 /* FIXME: What about bfd_link_hash_common? */
2984 && (h
->root
.type
== bfd_link_hash_defined
2985 || h
->root
.type
== bfd_link_hash_defweak
))
2987 /* We don't want to issue this warning. Clobber
2988 the section size so that the warning does not
2989 get copied into the output file. */
2995 sz
= bfd_section_size (abfd
, s
);
2996 prefix_len
= strlen (gnu_warning_prefix
);
2997 msg
= bfd_alloc (abfd
, prefix_len
+ sz
+ 1);
3001 strcpy (msg
, gnu_warning_prefix
);
3002 if (! bfd_get_section_contents (abfd
, s
, msg
+ prefix_len
, 0, sz
))
3005 msg
[prefix_len
+ sz
] = '\0';
3007 if (! (_bfd_generic_link_add_one_symbol
3008 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3009 FALSE
, collect
, NULL
)))
3012 if (! info
->relocatable
)
3014 /* Clobber the section size so that the warning does
3015 not get copied into the output file. */
3025 /* If we are creating a shared library, create all the dynamic
3026 sections immediately. We need to attach them to something,
3027 so we attach them to this BFD, provided it is the right
3028 format. FIXME: If there are no input BFD's of the same
3029 format as the output, we can't make a shared library. */
3031 && is_elf_hash_table (hash_table
)
3032 && hash_table
->root
.creator
== abfd
->xvec
3033 && ! hash_table
->dynamic_sections_created
)
3035 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3039 else if (!is_elf_hash_table (hash_table
))
3044 const char *soname
= NULL
;
3045 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3048 /* ld --just-symbols and dynamic objects don't mix very well.
3049 Test for --just-symbols by looking at info set up by
3050 _bfd_elf_link_just_syms. */
3051 if ((s
= abfd
->sections
) != NULL
3052 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3055 /* If this dynamic lib was specified on the command line with
3056 --as-needed in effect, then we don't want to add a DT_NEEDED
3057 tag unless the lib is actually used. Similary for libs brought
3058 in by another lib's DT_NEEDED. */
3059 add_needed
= elf_dyn_lib_class (abfd
) == DYN_NORMAL
;
3061 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3067 unsigned long shlink
;
3069 dynbuf
= bfd_malloc (s
->_raw_size
);
3073 if (! bfd_get_section_contents (abfd
, s
, dynbuf
, 0, s
->_raw_size
))
3074 goto error_free_dyn
;
3076 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3078 goto error_free_dyn
;
3079 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3081 for (extdyn
= dynbuf
;
3082 extdyn
< dynbuf
+ s
->_raw_size
;
3083 extdyn
+= bed
->s
->sizeof_dyn
)
3085 Elf_Internal_Dyn dyn
;
3087 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3088 if (dyn
.d_tag
== DT_SONAME
)
3090 unsigned int tagv
= dyn
.d_un
.d_val
;
3091 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3093 goto error_free_dyn
;
3095 if (dyn
.d_tag
== DT_NEEDED
)
3097 struct bfd_link_needed_list
*n
, **pn
;
3099 unsigned int tagv
= dyn
.d_un
.d_val
;
3101 amt
= sizeof (struct bfd_link_needed_list
);
3102 n
= bfd_alloc (abfd
, amt
);
3103 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3104 if (n
== NULL
|| fnm
== NULL
)
3105 goto error_free_dyn
;
3106 amt
= strlen (fnm
) + 1;
3107 anm
= bfd_alloc (abfd
, amt
);
3109 goto error_free_dyn
;
3110 memcpy (anm
, fnm
, amt
);
3114 for (pn
= & hash_table
->needed
;
3120 if (dyn
.d_tag
== DT_RUNPATH
)
3122 struct bfd_link_needed_list
*n
, **pn
;
3124 unsigned int tagv
= dyn
.d_un
.d_val
;
3126 amt
= sizeof (struct bfd_link_needed_list
);
3127 n
= bfd_alloc (abfd
, amt
);
3128 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3129 if (n
== NULL
|| fnm
== NULL
)
3130 goto error_free_dyn
;
3131 amt
= strlen (fnm
) + 1;
3132 anm
= bfd_alloc (abfd
, amt
);
3134 goto error_free_dyn
;
3135 memcpy (anm
, fnm
, amt
);
3139 for (pn
= & runpath
;
3145 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3146 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3148 struct bfd_link_needed_list
*n
, **pn
;
3150 unsigned int tagv
= dyn
.d_un
.d_val
;
3152 amt
= sizeof (struct bfd_link_needed_list
);
3153 n
= bfd_alloc (abfd
, amt
);
3154 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3155 if (n
== NULL
|| fnm
== NULL
)
3156 goto error_free_dyn
;
3157 amt
= strlen (fnm
) + 1;
3158 anm
= bfd_alloc (abfd
, amt
);
3165 memcpy (anm
, fnm
, amt
);
3180 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3181 frees all more recently bfd_alloc'd blocks as well. */
3187 struct bfd_link_needed_list
**pn
;
3188 for (pn
= & hash_table
->runpath
;
3195 /* We do not want to include any of the sections in a dynamic
3196 object in the output file. We hack by simply clobbering the
3197 list of sections in the BFD. This could be handled more
3198 cleanly by, say, a new section flag; the existing
3199 SEC_NEVER_LOAD flag is not the one we want, because that one
3200 still implies that the section takes up space in the output
3202 bfd_section_list_clear (abfd
);
3204 /* If this is the first dynamic object found in the link, create
3205 the special sections required for dynamic linking. */
3206 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3209 /* Find the name to use in a DT_NEEDED entry that refers to this
3210 object. If the object has a DT_SONAME entry, we use it.
3211 Otherwise, if the generic linker stuck something in
3212 elf_dt_name, we use that. Otherwise, we just use the file
3214 if (soname
== NULL
|| *soname
== '\0')
3216 soname
= elf_dt_name (abfd
);
3217 if (soname
== NULL
|| *soname
== '\0')
3218 soname
= bfd_get_filename (abfd
);
3221 /* Save the SONAME because sometimes the linker emulation code
3222 will need to know it. */
3223 elf_dt_name (abfd
) = soname
;
3225 ret
= elf_add_dt_needed_tag (info
, soname
, add_needed
);
3229 /* If we have already included this dynamic object in the
3230 link, just ignore it. There is no reason to include a
3231 particular dynamic object more than once. */
3236 /* If this is a dynamic object, we always link against the .dynsym
3237 symbol table, not the .symtab symbol table. The dynamic linker
3238 will only see the .dynsym symbol table, so there is no reason to
3239 look at .symtab for a dynamic object. */
3241 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3242 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3244 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3246 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3248 /* The sh_info field of the symtab header tells us where the
3249 external symbols start. We don't care about the local symbols at
3251 if (elf_bad_symtab (abfd
))
3253 extsymcount
= symcount
;
3258 extsymcount
= symcount
- hdr
->sh_info
;
3259 extsymoff
= hdr
->sh_info
;
3263 if (extsymcount
!= 0)
3265 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3267 if (isymbuf
== NULL
)
3270 /* We store a pointer to the hash table entry for each external
3272 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3273 sym_hash
= bfd_alloc (abfd
, amt
);
3274 if (sym_hash
== NULL
)
3275 goto error_free_sym
;
3276 elf_sym_hashes (abfd
) = sym_hash
;
3281 /* Read in any version definitions. */
3282 if (! _bfd_elf_slurp_version_tables (abfd
))
3283 goto error_free_sym
;
3285 /* Read in the symbol versions, but don't bother to convert them
3286 to internal format. */
3287 if (elf_dynversym (abfd
) != 0)
3289 Elf_Internal_Shdr
*versymhdr
;
3291 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3292 extversym
= bfd_malloc (versymhdr
->sh_size
);
3293 if (extversym
== NULL
)
3294 goto error_free_sym
;
3295 amt
= versymhdr
->sh_size
;
3296 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3297 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3298 goto error_free_vers
;
3304 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3305 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3307 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3314 struct elf_link_hash_entry
*h
;
3315 bfd_boolean definition
;
3316 bfd_boolean size_change_ok
;
3317 bfd_boolean type_change_ok
;
3318 bfd_boolean new_weakdef
;
3319 bfd_boolean override
;
3320 unsigned int old_alignment
;
3325 flags
= BSF_NO_FLAGS
;
3327 value
= isym
->st_value
;
3330 bind
= ELF_ST_BIND (isym
->st_info
);
3331 if (bind
== STB_LOCAL
)
3333 /* This should be impossible, since ELF requires that all
3334 global symbols follow all local symbols, and that sh_info
3335 point to the first global symbol. Unfortunately, Irix 5
3339 else if (bind
== STB_GLOBAL
)
3341 if (isym
->st_shndx
!= SHN_UNDEF
3342 && isym
->st_shndx
!= SHN_COMMON
)
3345 else if (bind
== STB_WEAK
)
3349 /* Leave it up to the processor backend. */
3352 if (isym
->st_shndx
== SHN_UNDEF
)
3353 sec
= bfd_und_section_ptr
;
3354 else if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
3356 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3358 sec
= bfd_abs_section_ptr
;
3359 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3362 else if (isym
->st_shndx
== SHN_ABS
)
3363 sec
= bfd_abs_section_ptr
;
3364 else if (isym
->st_shndx
== SHN_COMMON
)
3366 sec
= bfd_com_section_ptr
;
3367 /* What ELF calls the size we call the value. What ELF
3368 calls the value we call the alignment. */
3369 value
= isym
->st_size
;
3373 /* Leave it up to the processor backend. */
3376 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3379 goto error_free_vers
;
3381 if (isym
->st_shndx
== SHN_COMMON
3382 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
3384 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3388 tcomm
= bfd_make_section (abfd
, ".tcommon");
3390 || !bfd_set_section_flags (abfd
, tcomm
, (SEC_ALLOC
3392 | SEC_LINKER_CREATED
3393 | SEC_THREAD_LOCAL
)))
3394 goto error_free_vers
;
3398 else if (add_symbol_hook
)
3400 if (! (*add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
, &sec
,
3402 goto error_free_vers
;
3404 /* The hook function sets the name to NULL if this symbol
3405 should be skipped for some reason. */
3410 /* Sanity check that all possibilities were handled. */
3413 bfd_set_error (bfd_error_bad_value
);
3414 goto error_free_vers
;
3417 if (bfd_is_und_section (sec
)
3418 || bfd_is_com_section (sec
))
3423 size_change_ok
= FALSE
;
3424 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
3428 if (is_elf_hash_table (hash_table
))
3430 Elf_Internal_Versym iver
;
3431 unsigned int vernum
= 0;
3436 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
3437 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
3439 /* If this is a hidden symbol, or if it is not version
3440 1, we append the version name to the symbol name.
3441 However, we do not modify a non-hidden absolute
3442 symbol, because it might be the version symbol
3443 itself. FIXME: What if it isn't? */
3444 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
3445 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
3448 size_t namelen
, verlen
, newlen
;
3451 if (isym
->st_shndx
!= SHN_UNDEF
)
3453 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
3455 (*_bfd_error_handler
)
3456 (_("%s: %s: invalid version %u (max %d)"),
3457 bfd_archive_filename (abfd
), name
, vernum
,
3458 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
3459 bfd_set_error (bfd_error_bad_value
);
3460 goto error_free_vers
;
3462 else if (vernum
> 1)
3464 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
3470 /* We cannot simply test for the number of
3471 entries in the VERNEED section since the
3472 numbers for the needed versions do not start
3474 Elf_Internal_Verneed
*t
;
3477 for (t
= elf_tdata (abfd
)->verref
;
3481 Elf_Internal_Vernaux
*a
;
3483 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3485 if (a
->vna_other
== vernum
)
3487 verstr
= a
->vna_nodename
;
3496 (*_bfd_error_handler
)
3497 (_("%s: %s: invalid needed version %d"),
3498 bfd_archive_filename (abfd
), name
, vernum
);
3499 bfd_set_error (bfd_error_bad_value
);
3500 goto error_free_vers
;
3504 namelen
= strlen (name
);
3505 verlen
= strlen (verstr
);
3506 newlen
= namelen
+ verlen
+ 2;
3507 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3508 && isym
->st_shndx
!= SHN_UNDEF
)
3511 newname
= bfd_alloc (abfd
, newlen
);
3512 if (newname
== NULL
)
3513 goto error_free_vers
;
3514 memcpy (newname
, name
, namelen
);
3515 p
= newname
+ namelen
;
3517 /* If this is a defined non-hidden version symbol,
3518 we add another @ to the name. This indicates the
3519 default version of the symbol. */
3520 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3521 && isym
->st_shndx
!= SHN_UNDEF
)
3523 memcpy (p
, verstr
, verlen
+ 1);
3529 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
3530 sym_hash
, &skip
, &override
,
3531 &type_change_ok
, &size_change_ok
))
3532 goto error_free_vers
;
3541 while (h
->root
.type
== bfd_link_hash_indirect
3542 || h
->root
.type
== bfd_link_hash_warning
)
3543 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3545 /* Remember the old alignment if this is a common symbol, so
3546 that we don't reduce the alignment later on. We can't
3547 check later, because _bfd_generic_link_add_one_symbol
3548 will set a default for the alignment which we want to
3549 override. We also remember the old bfd where the existing
3550 definition comes from. */
3551 switch (h
->root
.type
)
3556 case bfd_link_hash_defined
:
3557 case bfd_link_hash_defweak
:
3558 old_bfd
= h
->root
.u
.def
.section
->owner
;
3561 case bfd_link_hash_common
:
3562 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
3563 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
3567 if (elf_tdata (abfd
)->verdef
!= NULL
3571 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
3574 if (! (_bfd_generic_link_add_one_symbol
3575 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, collect
,
3576 (struct bfd_link_hash_entry
**) sym_hash
)))
3577 goto error_free_vers
;
3580 while (h
->root
.type
== bfd_link_hash_indirect
3581 || h
->root
.type
== bfd_link_hash_warning
)
3582 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3585 new_weakdef
= FALSE
;
3588 && (flags
& BSF_WEAK
) != 0
3589 && ELF_ST_TYPE (isym
->st_info
) != STT_FUNC
3590 && is_elf_hash_table (hash_table
)
3591 && h
->weakdef
== NULL
)
3593 /* Keep a list of all weak defined non function symbols from
3594 a dynamic object, using the weakdef field. Later in this
3595 function we will set the weakdef field to the correct
3596 value. We only put non-function symbols from dynamic
3597 objects on this list, because that happens to be the only
3598 time we need to know the normal symbol corresponding to a
3599 weak symbol, and the information is time consuming to
3600 figure out. If the weakdef field is not already NULL,
3601 then this symbol was already defined by some previous
3602 dynamic object, and we will be using that previous
3603 definition anyhow. */
3610 /* Set the alignment of a common symbol. */
3611 if (isym
->st_shndx
== SHN_COMMON
3612 && h
->root
.type
== bfd_link_hash_common
)
3616 align
= bfd_log2 (isym
->st_value
);
3617 if (align
> old_alignment
3618 /* Permit an alignment power of zero if an alignment of one
3619 is specified and no other alignments have been specified. */
3620 || (isym
->st_value
== 1 && old_alignment
== 0))
3621 h
->root
.u
.c
.p
->alignment_power
= align
;
3623 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
3626 if (is_elf_hash_table (hash_table
))
3632 /* Check the alignment when a common symbol is involved. This
3633 can change when a common symbol is overridden by a normal
3634 definition or a common symbol is ignored due to the old
3635 normal definition. We need to make sure the maximum
3636 alignment is maintained. */
3637 if ((old_alignment
|| isym
->st_shndx
== SHN_COMMON
)
3638 && h
->root
.type
!= bfd_link_hash_common
)
3640 unsigned int common_align
;
3641 unsigned int normal_align
;
3642 unsigned int symbol_align
;
3646 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
3647 if (h
->root
.u
.def
.section
->owner
!= NULL
3648 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3650 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
3651 if (normal_align
> symbol_align
)
3652 normal_align
= symbol_align
;
3655 normal_align
= symbol_align
;
3659 common_align
= old_alignment
;
3660 common_bfd
= old_bfd
;
3665 common_align
= bfd_log2 (isym
->st_value
);
3667 normal_bfd
= old_bfd
;
3670 if (normal_align
< common_align
)
3671 (*_bfd_error_handler
)
3672 (_("Warning: alignment %u of symbol `%s' in %s is smaller than %u in %s"),
3675 bfd_archive_filename (normal_bfd
),
3677 bfd_archive_filename (common_bfd
));
3680 /* Remember the symbol size and type. */
3681 if (isym
->st_size
!= 0
3682 && (definition
|| h
->size
== 0))
3684 if (h
->size
!= 0 && h
->size
!= isym
->st_size
&& ! size_change_ok
)
3685 (*_bfd_error_handler
)
3686 (_("Warning: size of symbol `%s' changed from %lu in %s to %lu in %s"),
3687 name
, (unsigned long) h
->size
,
3688 bfd_archive_filename (old_bfd
),
3689 (unsigned long) isym
->st_size
,
3690 bfd_archive_filename (abfd
));
3692 h
->size
= isym
->st_size
;
3695 /* If this is a common symbol, then we always want H->SIZE
3696 to be the size of the common symbol. The code just above
3697 won't fix the size if a common symbol becomes larger. We
3698 don't warn about a size change here, because that is
3699 covered by --warn-common. */
3700 if (h
->root
.type
== bfd_link_hash_common
)
3701 h
->size
= h
->root
.u
.c
.size
;
3703 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
3704 && (definition
|| h
->type
== STT_NOTYPE
))
3706 if (h
->type
!= STT_NOTYPE
3707 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
3708 && ! type_change_ok
)
3709 (*_bfd_error_handler
)
3710 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
3711 name
, h
->type
, ELF_ST_TYPE (isym
->st_info
),
3712 bfd_archive_filename (abfd
));
3714 h
->type
= ELF_ST_TYPE (isym
->st_info
);
3717 /* If st_other has a processor-specific meaning, specific
3718 code might be needed here. We never merge the visibility
3719 attribute with the one from a dynamic object. */
3720 if (bed
->elf_backend_merge_symbol_attribute
)
3721 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
3724 if (isym
->st_other
!= 0 && !dynamic
)
3726 unsigned char hvis
, symvis
, other
, nvis
;
3728 /* Take the balance of OTHER from the definition. */
3729 other
= (definition
? isym
->st_other
: h
->other
);
3730 other
&= ~ ELF_ST_VISIBILITY (-1);
3732 /* Combine visibilities, using the most constraining one. */
3733 hvis
= ELF_ST_VISIBILITY (h
->other
);
3734 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
3740 nvis
= hvis
< symvis
? hvis
: symvis
;
3742 h
->other
= other
| nvis
;
3745 /* Set a flag in the hash table entry indicating the type of
3746 reference or definition we just found. Keep a count of
3747 the number of dynamic symbols we find. A dynamic symbol
3748 is one which is referenced or defined by both a regular
3749 object and a shared object. */
3750 old_flags
= h
->elf_link_hash_flags
;
3756 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
3757 if (bind
!= STB_WEAK
)
3758 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3761 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
3762 if (! info
->executable
3763 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
3764 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
3770 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
3772 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
3773 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
3774 | ELF_LINK_HASH_REF_REGULAR
)) != 0
3775 || (h
->weakdef
!= NULL
3777 && h
->weakdef
->dynindx
!= -1))
3781 h
->elf_link_hash_flags
|= new_flag
;
3783 /* Check to see if we need to add an indirect symbol for
3784 the default name. */
3785 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
3786 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
3787 &sec
, &value
, &dynsym
,
3789 goto error_free_vers
;
3791 if (definition
&& !dynamic
)
3793 char *p
= strchr (name
, ELF_VER_CHR
);
3794 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
3796 /* Queue non-default versions so that .symver x, x@FOO
3797 aliases can be checked. */
3798 if (! nondeflt_vers
)
3800 amt
= (isymend
- isym
+ 1)
3801 * sizeof (struct elf_link_hash_entry
*);
3802 nondeflt_vers
= bfd_malloc (amt
);
3804 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
3808 if (dynsym
&& h
->dynindx
== -1)
3810 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3811 goto error_free_vers
;
3812 if (h
->weakdef
!= NULL
3814 && h
->weakdef
->dynindx
== -1)
3816 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
3817 goto error_free_vers
;
3820 else if (dynsym
&& h
->dynindx
!= -1)
3821 /* If the symbol already has a dynamic index, but
3822 visibility says it should not be visible, turn it into
3824 switch (ELF_ST_VISIBILITY (h
->other
))
3828 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
3836 && (h
->elf_link_hash_flags
3837 & ELF_LINK_HASH_REF_REGULAR
) != 0)
3840 const char *soname
= elf_dt_name (abfd
);
3842 /* A symbol from a library loaded via DT_NEEDED of some
3843 other library is referenced by a regular object.
3844 Add a DT_NEEDED entry for it. */
3846 ret
= elf_add_dt_needed_tag (info
, soname
, add_needed
);
3848 goto error_free_vers
;
3850 BFD_ASSERT (ret
== 0);
3855 /* Now that all the symbols from this input file are created, handle
3856 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
3857 if (nondeflt_vers
!= NULL
)
3859 bfd_size_type cnt
, symidx
;
3861 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
3863 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
3864 char *shortname
, *p
;
3866 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3868 || (h
->root
.type
!= bfd_link_hash_defined
3869 && h
->root
.type
!= bfd_link_hash_defweak
))
3872 amt
= p
- h
->root
.root
.string
;
3873 shortname
= bfd_malloc (amt
+ 1);
3874 memcpy (shortname
, h
->root
.root
.string
, amt
);
3875 shortname
[amt
] = '\0';
3877 hi
= (struct elf_link_hash_entry
*)
3878 bfd_link_hash_lookup (&hash_table
->root
, shortname
,
3879 FALSE
, FALSE
, FALSE
);
3881 && hi
->root
.type
== h
->root
.type
3882 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
3883 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
3885 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
3886 hi
->root
.type
= bfd_link_hash_indirect
;
3887 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
3888 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
3889 sym_hash
= elf_sym_hashes (abfd
);
3891 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
3892 if (sym_hash
[symidx
] == hi
)
3894 sym_hash
[symidx
] = h
;
3900 free (nondeflt_vers
);
3901 nondeflt_vers
= NULL
;
3904 if (extversym
!= NULL
)
3910 if (isymbuf
!= NULL
)
3914 /* Now set the weakdefs field correctly for all the weak defined
3915 symbols we found. The only way to do this is to search all the
3916 symbols. Since we only need the information for non functions in
3917 dynamic objects, that's the only time we actually put anything on
3918 the list WEAKS. We need this information so that if a regular
3919 object refers to a symbol defined weakly in a dynamic object, the
3920 real symbol in the dynamic object is also put in the dynamic
3921 symbols; we also must arrange for both symbols to point to the
3922 same memory location. We could handle the general case of symbol
3923 aliasing, but a general symbol alias can only be generated in
3924 assembler code, handling it correctly would be very time
3925 consuming, and other ELF linkers don't handle general aliasing
3929 struct elf_link_hash_entry
**hpp
;
3930 struct elf_link_hash_entry
**hppend
;
3931 struct elf_link_hash_entry
**sorted_sym_hash
;
3932 struct elf_link_hash_entry
*h
;
3935 /* Since we have to search the whole symbol list for each weak
3936 defined symbol, search time for N weak defined symbols will be
3937 O(N^2). Binary search will cut it down to O(NlogN). */
3938 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3939 sorted_sym_hash
= bfd_malloc (amt
);
3940 if (sorted_sym_hash
== NULL
)
3942 sym_hash
= sorted_sym_hash
;
3943 hpp
= elf_sym_hashes (abfd
);
3944 hppend
= hpp
+ extsymcount
;
3946 for (; hpp
< hppend
; hpp
++)
3950 && h
->root
.type
== bfd_link_hash_defined
3951 && h
->type
!= STT_FUNC
)
3959 qsort (sorted_sym_hash
, sym_count
,
3960 sizeof (struct elf_link_hash_entry
*),
3963 while (weaks
!= NULL
)
3965 struct elf_link_hash_entry
*hlook
;
3972 weaks
= hlook
->weakdef
;
3973 hlook
->weakdef
= NULL
;
3975 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
3976 || hlook
->root
.type
== bfd_link_hash_defweak
3977 || hlook
->root
.type
== bfd_link_hash_common
3978 || hlook
->root
.type
== bfd_link_hash_indirect
);
3979 slook
= hlook
->root
.u
.def
.section
;
3980 vlook
= hlook
->root
.u
.def
.value
;
3987 bfd_signed_vma vdiff
;
3989 h
= sorted_sym_hash
[idx
];
3990 vdiff
= vlook
- h
->root
.u
.def
.value
;
3997 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4010 /* We didn't find a value/section match. */
4014 for (i
= ilook
; i
< sym_count
; i
++)
4016 h
= sorted_sym_hash
[i
];
4018 /* Stop if value or section doesn't match. */
4019 if (h
->root
.u
.def
.value
!= vlook
4020 || h
->root
.u
.def
.section
!= slook
)
4022 else if (h
!= hlook
)
4026 /* If the weak definition is in the list of dynamic
4027 symbols, make sure the real definition is put
4029 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4031 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4035 /* If the real definition is in the list of dynamic
4036 symbols, make sure the weak definition is put
4037 there as well. If we don't do this, then the
4038 dynamic loader might not merge the entries for the
4039 real definition and the weak definition. */
4040 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4042 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4050 free (sorted_sym_hash
);
4053 /* If this object is the same format as the output object, and it is
4054 not a shared library, then let the backend look through the
4057 This is required to build global offset table entries and to
4058 arrange for dynamic relocs. It is not required for the
4059 particular common case of linking non PIC code, even when linking
4060 against shared libraries, but unfortunately there is no way of
4061 knowing whether an object file has been compiled PIC or not.
4062 Looking through the relocs is not particularly time consuming.
4063 The problem is that we must either (1) keep the relocs in memory,
4064 which causes the linker to require additional runtime memory or
4065 (2) read the relocs twice from the input file, which wastes time.
4066 This would be a good case for using mmap.
4068 I have no idea how to handle linking PIC code into a file of a
4069 different format. It probably can't be done. */
4070 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
4072 && is_elf_hash_table (hash_table
)
4073 && hash_table
->root
.creator
== abfd
->xvec
4074 && check_relocs
!= NULL
)
4078 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4080 Elf_Internal_Rela
*internal_relocs
;
4083 if ((o
->flags
& SEC_RELOC
) == 0
4084 || o
->reloc_count
== 0
4085 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4086 && (o
->flags
& SEC_DEBUGGING
) != 0)
4087 || bfd_is_abs_section (o
->output_section
))
4090 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4092 if (internal_relocs
== NULL
)
4095 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
4097 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4098 free (internal_relocs
);
4105 /* If this is a non-traditional link, try to optimize the handling
4106 of the .stab/.stabstr sections. */
4108 && ! info
->traditional_format
4109 && is_elf_hash_table (hash_table
)
4110 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4114 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4115 if (stabstr
!= NULL
)
4117 bfd_size_type string_offset
= 0;
4120 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4121 if (strncmp (".stab", stab
->name
, 5) == 0
4122 && (!stab
->name
[5] ||
4123 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4124 && (stab
->flags
& SEC_MERGE
) == 0
4125 && !bfd_is_abs_section (stab
->output_section
))
4127 struct bfd_elf_section_data
*secdata
;
4129 secdata
= elf_section_data (stab
);
4130 if (! _bfd_link_section_stabs (abfd
,
4131 & hash_table
->stab_info
,
4136 if (secdata
->sec_info
)
4137 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4142 if (is_elf_hash_table (hash_table
))
4144 /* Add this bfd to the loaded list. */
4145 struct elf_link_loaded_list
*n
;
4147 n
= bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4151 n
->next
= hash_table
->loaded
;
4152 hash_table
->loaded
= n
;
4158 if (nondeflt_vers
!= NULL
)
4159 free (nondeflt_vers
);
4160 if (extversym
!= NULL
)
4163 if (isymbuf
!= NULL
)
4169 /* Add symbols from an ELF archive file to the linker hash table. We
4170 don't use _bfd_generic_link_add_archive_symbols because of a
4171 problem which arises on UnixWare. The UnixWare libc.so is an
4172 archive which includes an entry libc.so.1 which defines a bunch of
4173 symbols. The libc.so archive also includes a number of other
4174 object files, which also define symbols, some of which are the same
4175 as those defined in libc.so.1. Correct linking requires that we
4176 consider each object file in turn, and include it if it defines any
4177 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4178 this; it looks through the list of undefined symbols, and includes
4179 any object file which defines them. When this algorithm is used on
4180 UnixWare, it winds up pulling in libc.so.1 early and defining a
4181 bunch of symbols. This means that some of the other objects in the
4182 archive are not included in the link, which is incorrect since they
4183 precede libc.so.1 in the archive.
4185 Fortunately, ELF archive handling is simpler than that done by
4186 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4187 oddities. In ELF, if we find a symbol in the archive map, and the
4188 symbol is currently undefined, we know that we must pull in that
4191 Unfortunately, we do have to make multiple passes over the symbol
4192 table until nothing further is resolved. */
4195 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4198 bfd_boolean
*defined
= NULL
;
4199 bfd_boolean
*included
= NULL
;
4204 if (! bfd_has_map (abfd
))
4206 /* An empty archive is a special case. */
4207 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4209 bfd_set_error (bfd_error_no_armap
);
4213 /* Keep track of all symbols we know to be already defined, and all
4214 files we know to be already included. This is to speed up the
4215 second and subsequent passes. */
4216 c
= bfd_ardata (abfd
)->symdef_count
;
4220 amt
*= sizeof (bfd_boolean
);
4221 defined
= bfd_zmalloc (amt
);
4222 included
= bfd_zmalloc (amt
);
4223 if (defined
== NULL
|| included
== NULL
)
4226 symdefs
= bfd_ardata (abfd
)->symdefs
;
4239 symdefend
= symdef
+ c
;
4240 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
4242 struct elf_link_hash_entry
*h
;
4244 struct bfd_link_hash_entry
*undefs_tail
;
4247 if (defined
[i
] || included
[i
])
4249 if (symdef
->file_offset
== last
)
4255 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
4256 FALSE
, FALSE
, FALSE
);
4263 /* If this is a default version (the name contains @@),
4264 look up the symbol again with only one `@' as well
4265 as without the version. The effect is that references
4266 to the symbol with and without the version will be
4267 matched by the default symbol in the archive. */
4269 p
= strchr (symdef
->name
, ELF_VER_CHR
);
4270 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4273 /* First check with only one `@'. */
4274 len
= strlen (symdef
->name
);
4275 copy
= bfd_alloc (abfd
, len
);
4278 first
= p
- symdef
->name
+ 1;
4279 memcpy (copy
, symdef
->name
, first
);
4280 memcpy (copy
+ first
, symdef
->name
+ first
+ 1, len
- first
);
4282 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4283 FALSE
, FALSE
, FALSE
);
4287 /* We also need to check references to the symbol
4288 without the version. */
4290 copy
[first
- 1] = '\0';
4291 h
= elf_link_hash_lookup (elf_hash_table (info
),
4292 copy
, FALSE
, FALSE
, FALSE
);
4295 bfd_release (abfd
, copy
);
4301 if (h
->root
.type
== bfd_link_hash_common
)
4303 /* We currently have a common symbol. The archive map contains
4304 a reference to this symbol, so we may want to include it. We
4305 only want to include it however, if this archive element
4306 contains a definition of the symbol, not just another common
4309 Unfortunately some archivers (including GNU ar) will put
4310 declarations of common symbols into their archive maps, as
4311 well as real definitions, so we cannot just go by the archive
4312 map alone. Instead we must read in the element's symbol
4313 table and check that to see what kind of symbol definition
4315 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
4318 else if (h
->root
.type
!= bfd_link_hash_undefined
)
4320 if (h
->root
.type
!= bfd_link_hash_undefweak
)
4325 /* We need to include this archive member. */
4326 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
4327 if (element
== NULL
)
4330 if (! bfd_check_format (element
, bfd_object
))
4333 /* Doublecheck that we have not included this object
4334 already--it should be impossible, but there may be
4335 something wrong with the archive. */
4336 if (element
->archive_pass
!= 0)
4338 bfd_set_error (bfd_error_bad_value
);
4341 element
->archive_pass
= 1;
4343 undefs_tail
= info
->hash
->undefs_tail
;
4345 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
4348 if (! bfd_link_add_symbols (element
, info
))
4351 /* If there are any new undefined symbols, we need to make
4352 another pass through the archive in order to see whether
4353 they can be defined. FIXME: This isn't perfect, because
4354 common symbols wind up on undefs_tail and because an
4355 undefined symbol which is defined later on in this pass
4356 does not require another pass. This isn't a bug, but it
4357 does make the code less efficient than it could be. */
4358 if (undefs_tail
!= info
->hash
->undefs_tail
)
4361 /* Look backward to mark all symbols from this object file
4362 which we have already seen in this pass. */
4366 included
[mark
] = TRUE
;
4371 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
4373 /* We mark subsequent symbols from this object file as we go
4374 on through the loop. */
4375 last
= symdef
->file_offset
;
4386 if (defined
!= NULL
)
4388 if (included
!= NULL
)
4393 /* Given an ELF BFD, add symbols to the global hash table as
4397 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4399 switch (bfd_get_format (abfd
))
4402 return elf_link_add_object_symbols (abfd
, info
);
4404 return elf_link_add_archive_symbols (abfd
, info
);
4406 bfd_set_error (bfd_error_wrong_format
);
4411 /* This function will be called though elf_link_hash_traverse to store
4412 all hash value of the exported symbols in an array. */
4415 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
4417 unsigned long **valuep
= data
;
4423 if (h
->root
.type
== bfd_link_hash_warning
)
4424 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4426 /* Ignore indirect symbols. These are added by the versioning code. */
4427 if (h
->dynindx
== -1)
4430 name
= h
->root
.root
.string
;
4431 p
= strchr (name
, ELF_VER_CHR
);
4434 alc
= bfd_malloc (p
- name
+ 1);
4435 memcpy (alc
, name
, p
- name
);
4436 alc
[p
- name
] = '\0';
4440 /* Compute the hash value. */
4441 ha
= bfd_elf_hash (name
);
4443 /* Store the found hash value in the array given as the argument. */
4446 /* And store it in the struct so that we can put it in the hash table
4448 h
->elf_hash_value
= ha
;
4456 /* Array used to determine the number of hash table buckets to use
4457 based on the number of symbols there are. If there are fewer than
4458 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
4459 fewer than 37 we use 17 buckets, and so forth. We never use more
4460 than 32771 buckets. */
4462 static const size_t elf_buckets
[] =
4464 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
4468 /* Compute bucket count for hashing table. We do not use a static set
4469 of possible tables sizes anymore. Instead we determine for all
4470 possible reasonable sizes of the table the outcome (i.e., the
4471 number of collisions etc) and choose the best solution. The
4472 weighting functions are not too simple to allow the table to grow
4473 without bounds. Instead one of the weighting factors is the size.
4474 Therefore the result is always a good payoff between few collisions
4475 (= short chain lengths) and table size. */
4477 compute_bucket_count (struct bfd_link_info
*info
)
4479 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
4480 size_t best_size
= 0;
4481 unsigned long int *hashcodes
;
4482 unsigned long int *hashcodesp
;
4483 unsigned long int i
;
4486 /* Compute the hash values for all exported symbols. At the same
4487 time store the values in an array so that we could use them for
4490 amt
*= sizeof (unsigned long int);
4491 hashcodes
= bfd_malloc (amt
);
4492 if (hashcodes
== NULL
)
4494 hashcodesp
= hashcodes
;
4496 /* Put all hash values in HASHCODES. */
4497 elf_link_hash_traverse (elf_hash_table (info
),
4498 elf_collect_hash_codes
, &hashcodesp
);
4500 /* We have a problem here. The following code to optimize the table
4501 size requires an integer type with more the 32 bits. If
4502 BFD_HOST_U_64_BIT is set we know about such a type. */
4503 #ifdef BFD_HOST_U_64_BIT
4506 unsigned long int nsyms
= hashcodesp
- hashcodes
;
4509 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
4510 unsigned long int *counts
;
4511 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4512 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
4514 /* Possible optimization parameters: if we have NSYMS symbols we say
4515 that the hashing table must at least have NSYMS/4 and at most
4517 minsize
= nsyms
/ 4;
4520 best_size
= maxsize
= nsyms
* 2;
4522 /* Create array where we count the collisions in. We must use bfd_malloc
4523 since the size could be large. */
4525 amt
*= sizeof (unsigned long int);
4526 counts
= bfd_malloc (amt
);
4533 /* Compute the "optimal" size for the hash table. The criteria is a
4534 minimal chain length. The minor criteria is (of course) the size
4536 for (i
= minsize
; i
< maxsize
; ++i
)
4538 /* Walk through the array of hashcodes and count the collisions. */
4539 BFD_HOST_U_64_BIT max
;
4540 unsigned long int j
;
4541 unsigned long int fact
;
4543 memset (counts
, '\0', i
* sizeof (unsigned long int));
4545 /* Determine how often each hash bucket is used. */
4546 for (j
= 0; j
< nsyms
; ++j
)
4547 ++counts
[hashcodes
[j
] % i
];
4549 /* For the weight function we need some information about the
4550 pagesize on the target. This is information need not be 100%
4551 accurate. Since this information is not available (so far) we
4552 define it here to a reasonable default value. If it is crucial
4553 to have a better value some day simply define this value. */
4554 # ifndef BFD_TARGET_PAGESIZE
4555 # define BFD_TARGET_PAGESIZE (4096)
4558 /* We in any case need 2 + NSYMS entries for the size values and
4560 max
= (2 + nsyms
) * (bed
->s
->arch_size
/ 8);
4563 /* Variant 1: optimize for short chains. We add the squares
4564 of all the chain lengths (which favors many small chain
4565 over a few long chains). */
4566 for (j
= 0; j
< i
; ++j
)
4567 max
+= counts
[j
] * counts
[j
];
4569 /* This adds penalties for the overall size of the table. */
4570 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4573 /* Variant 2: Optimize a lot more for small table. Here we
4574 also add squares of the size but we also add penalties for
4575 empty slots (the +1 term). */
4576 for (j
= 0; j
< i
; ++j
)
4577 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
4579 /* The overall size of the table is considered, but not as
4580 strong as in variant 1, where it is squared. */
4581 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4585 /* Compare with current best results. */
4586 if (max
< best_chlen
)
4596 #endif /* defined (BFD_HOST_U_64_BIT) */
4598 /* This is the fallback solution if no 64bit type is available or if we
4599 are not supposed to spend much time on optimizations. We select the
4600 bucket count using a fixed set of numbers. */
4601 for (i
= 0; elf_buckets
[i
] != 0; i
++)
4603 best_size
= elf_buckets
[i
];
4604 if (dynsymcount
< elf_buckets
[i
+ 1])
4609 /* Free the arrays we needed. */
4615 /* Set up the sizes and contents of the ELF dynamic sections. This is
4616 called by the ELF linker emulation before_allocation routine. We
4617 must set the sizes of the sections before the linker sets the
4618 addresses of the various sections. */
4621 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
4624 const char *filter_shlib
,
4625 const char * const *auxiliary_filters
,
4626 struct bfd_link_info
*info
,
4627 asection
**sinterpptr
,
4628 struct bfd_elf_version_tree
*verdefs
)
4630 bfd_size_type soname_indx
;
4632 const struct elf_backend_data
*bed
;
4633 struct elf_assign_sym_version_info asvinfo
;
4637 soname_indx
= (bfd_size_type
) -1;
4639 if (!is_elf_hash_table (info
->hash
))
4642 elf_tdata (output_bfd
)->relro
= info
->relro
;
4643 if (info
->execstack
)
4644 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
4645 else if (info
->noexecstack
)
4646 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
4650 asection
*notesec
= NULL
;
4653 for (inputobj
= info
->input_bfds
;
4655 inputobj
= inputobj
->link_next
)
4659 if (inputobj
->flags
& DYNAMIC
)
4661 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
4664 if (s
->flags
& SEC_CODE
)
4673 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
4674 if (exec
&& info
->relocatable
4675 && notesec
->output_section
!= bfd_abs_section_ptr
)
4676 notesec
->output_section
->flags
|= SEC_CODE
;
4680 /* Any syms created from now on start with -1 in
4681 got.refcount/offset and plt.refcount/offset. */
4682 elf_hash_table (info
)->init_refcount
= elf_hash_table (info
)->init_offset
;
4684 /* The backend may have to create some sections regardless of whether
4685 we're dynamic or not. */
4686 bed
= get_elf_backend_data (output_bfd
);
4687 if (bed
->elf_backend_always_size_sections
4688 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
4691 dynobj
= elf_hash_table (info
)->dynobj
;
4693 /* If there were no dynamic objects in the link, there is nothing to
4698 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
4701 if (elf_hash_table (info
)->dynamic_sections_created
)
4703 struct elf_info_failed eif
;
4704 struct elf_link_hash_entry
*h
;
4706 struct bfd_elf_version_tree
*t
;
4707 struct bfd_elf_version_expr
*d
;
4708 bfd_boolean all_defined
;
4710 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
4711 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
4715 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4717 if (soname_indx
== (bfd_size_type
) -1
4718 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
4724 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
4726 info
->flags
|= DF_SYMBOLIC
;
4733 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
4735 if (indx
== (bfd_size_type
) -1
4736 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
4739 if (info
->new_dtags
)
4741 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
4742 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
4747 if (filter_shlib
!= NULL
)
4751 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4752 filter_shlib
, TRUE
);
4753 if (indx
== (bfd_size_type
) -1
4754 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
4758 if (auxiliary_filters
!= NULL
)
4760 const char * const *p
;
4762 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
4766 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4768 if (indx
== (bfd_size_type
) -1
4769 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
4775 eif
.verdefs
= verdefs
;
4778 /* If we are supposed to export all symbols into the dynamic symbol
4779 table (this is not the normal case), then do so. */
4780 if (info
->export_dynamic
)
4782 elf_link_hash_traverse (elf_hash_table (info
),
4783 _bfd_elf_export_symbol
,
4789 /* Make all global versions with definition. */
4790 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
4791 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
4792 if (!d
->symver
&& d
->symbol
)
4794 const char *verstr
, *name
;
4795 size_t namelen
, verlen
, newlen
;
4797 struct elf_link_hash_entry
*newh
;
4800 namelen
= strlen (name
);
4802 verlen
= strlen (verstr
);
4803 newlen
= namelen
+ verlen
+ 3;
4805 newname
= bfd_malloc (newlen
);
4806 if (newname
== NULL
)
4808 memcpy (newname
, name
, namelen
);
4810 /* Check the hidden versioned definition. */
4811 p
= newname
+ namelen
;
4813 memcpy (p
, verstr
, verlen
+ 1);
4814 newh
= elf_link_hash_lookup (elf_hash_table (info
),
4815 newname
, FALSE
, FALSE
,
4818 || (newh
->root
.type
!= bfd_link_hash_defined
4819 && newh
->root
.type
!= bfd_link_hash_defweak
))
4821 /* Check the default versioned definition. */
4823 memcpy (p
, verstr
, verlen
+ 1);
4824 newh
= elf_link_hash_lookup (elf_hash_table (info
),
4825 newname
, FALSE
, FALSE
,
4830 /* Mark this version if there is a definition and it is
4831 not defined in a shared object. */
4833 && ((newh
->elf_link_hash_flags
4834 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)
4835 && (newh
->root
.type
== bfd_link_hash_defined
4836 || newh
->root
.type
== bfd_link_hash_defweak
))
4840 /* Attach all the symbols to their version information. */
4841 asvinfo
.output_bfd
= output_bfd
;
4842 asvinfo
.info
= info
;
4843 asvinfo
.verdefs
= verdefs
;
4844 asvinfo
.failed
= FALSE
;
4846 elf_link_hash_traverse (elf_hash_table (info
),
4847 _bfd_elf_link_assign_sym_version
,
4852 if (!info
->allow_undefined_version
)
4854 /* Check if all global versions have a definition. */
4856 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
4857 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
4858 if (!d
->symver
&& !d
->script
)
4860 (*_bfd_error_handler
)
4861 (_("%s: undefined version: %s"),
4862 d
->pattern
, t
->name
);
4863 all_defined
= FALSE
;
4868 bfd_set_error (bfd_error_bad_value
);
4873 /* Find all symbols which were defined in a dynamic object and make
4874 the backend pick a reasonable value for them. */
4875 elf_link_hash_traverse (elf_hash_table (info
),
4876 _bfd_elf_adjust_dynamic_symbol
,
4881 /* Add some entries to the .dynamic section. We fill in some of the
4882 values later, in elf_bfd_final_link, but we must add the entries
4883 now so that we know the final size of the .dynamic section. */
4885 /* If there are initialization and/or finalization functions to
4886 call then add the corresponding DT_INIT/DT_FINI entries. */
4887 h
= (info
->init_function
4888 ? elf_link_hash_lookup (elf_hash_table (info
),
4889 info
->init_function
, FALSE
,
4893 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
4894 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
4896 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
4899 h
= (info
->fini_function
4900 ? elf_link_hash_lookup (elf_hash_table (info
),
4901 info
->fini_function
, FALSE
,
4905 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
4906 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
4908 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
4912 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
4914 /* DT_PREINIT_ARRAY is not allowed in shared library. */
4915 if (! info
->executable
)
4920 for (sub
= info
->input_bfds
; sub
!= NULL
;
4921 sub
= sub
->link_next
)
4922 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4923 if (elf_section_data (o
)->this_hdr
.sh_type
4924 == SHT_PREINIT_ARRAY
)
4926 (*_bfd_error_handler
)
4927 (_("%s: .preinit_array section is not allowed in DSO"),
4928 bfd_archive_filename (sub
));
4932 bfd_set_error (bfd_error_nonrepresentable_section
);
4936 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
4937 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
4940 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
4942 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
4943 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
4946 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
4948 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
4949 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
4953 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
4954 /* If .dynstr is excluded from the link, we don't want any of
4955 these tags. Strictly, we should be checking each section
4956 individually; This quick check covers for the case where
4957 someone does a /DISCARD/ : { *(*) }. */
4958 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
4960 bfd_size_type strsize
;
4962 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
4963 if (!_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0)
4964 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
4965 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
4966 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
4967 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
4968 bed
->s
->sizeof_sym
))
4973 /* The backend must work out the sizes of all the other dynamic
4975 if (bed
->elf_backend_size_dynamic_sections
4976 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
4979 if (elf_hash_table (info
)->dynamic_sections_created
)
4981 bfd_size_type dynsymcount
;
4983 size_t bucketcount
= 0;
4984 size_t hash_entry_size
;
4985 unsigned int dtagcount
;
4987 /* Set up the version definition section. */
4988 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
4989 BFD_ASSERT (s
!= NULL
);
4991 /* We may have created additional version definitions if we are
4992 just linking a regular application. */
4993 verdefs
= asvinfo
.verdefs
;
4995 /* Skip anonymous version tag. */
4996 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
4997 verdefs
= verdefs
->next
;
4999 if (verdefs
== NULL
)
5000 _bfd_strip_section_from_output (info
, s
);
5005 struct bfd_elf_version_tree
*t
;
5007 Elf_Internal_Verdef def
;
5008 Elf_Internal_Verdaux defaux
;
5013 /* Make space for the base version. */
5014 size
+= sizeof (Elf_External_Verdef
);
5015 size
+= sizeof (Elf_External_Verdaux
);
5018 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5020 struct bfd_elf_version_deps
*n
;
5022 size
+= sizeof (Elf_External_Verdef
);
5023 size
+= sizeof (Elf_External_Verdaux
);
5026 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5027 size
+= sizeof (Elf_External_Verdaux
);
5030 s
->_raw_size
= size
;
5031 s
->contents
= bfd_alloc (output_bfd
, s
->_raw_size
);
5032 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
5035 /* Fill in the version definition section. */
5039 def
.vd_version
= VER_DEF_CURRENT
;
5040 def
.vd_flags
= VER_FLG_BASE
;
5043 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5044 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5045 + sizeof (Elf_External_Verdaux
));
5047 if (soname_indx
!= (bfd_size_type
) -1)
5049 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5051 def
.vd_hash
= bfd_elf_hash (soname
);
5052 defaux
.vda_name
= soname_indx
;
5059 name
= basename (output_bfd
->filename
);
5060 def
.vd_hash
= bfd_elf_hash (name
);
5061 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5063 if (indx
== (bfd_size_type
) -1)
5065 defaux
.vda_name
= indx
;
5067 defaux
.vda_next
= 0;
5069 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5070 (Elf_External_Verdef
*) p
);
5071 p
+= sizeof (Elf_External_Verdef
);
5072 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5073 (Elf_External_Verdaux
*) p
);
5074 p
+= sizeof (Elf_External_Verdaux
);
5076 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5079 struct bfd_elf_version_deps
*n
;
5080 struct elf_link_hash_entry
*h
;
5081 struct bfd_link_hash_entry
*bh
;
5084 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5087 /* Add a symbol representing this version. */
5089 if (! (_bfd_generic_link_add_one_symbol
5090 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5092 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5094 h
= (struct elf_link_hash_entry
*) bh
;
5095 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
5096 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
5097 h
->type
= STT_OBJECT
;
5098 h
->verinfo
.vertree
= t
;
5100 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5103 def
.vd_version
= VER_DEF_CURRENT
;
5105 if (t
->globals
.list
== NULL
5106 && t
->locals
.list
== NULL
5108 def
.vd_flags
|= VER_FLG_WEAK
;
5109 def
.vd_ndx
= t
->vernum
+ 1;
5110 def
.vd_cnt
= cdeps
+ 1;
5111 def
.vd_hash
= bfd_elf_hash (t
->name
);
5112 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5114 if (t
->next
!= NULL
)
5115 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5116 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
5118 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5119 (Elf_External_Verdef
*) p
);
5120 p
+= sizeof (Elf_External_Verdef
);
5122 defaux
.vda_name
= h
->dynstr_index
;
5123 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5125 defaux
.vda_next
= 0;
5126 if (t
->deps
!= NULL
)
5127 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5128 t
->name_indx
= defaux
.vda_name
;
5130 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5131 (Elf_External_Verdaux
*) p
);
5132 p
+= sizeof (Elf_External_Verdaux
);
5134 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5136 if (n
->version_needed
== NULL
)
5138 /* This can happen if there was an error in the
5140 defaux
.vda_name
= 0;
5144 defaux
.vda_name
= n
->version_needed
->name_indx
;
5145 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5148 if (n
->next
== NULL
)
5149 defaux
.vda_next
= 0;
5151 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5153 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5154 (Elf_External_Verdaux
*) p
);
5155 p
+= sizeof (Elf_External_Verdaux
);
5159 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
5160 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
5163 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
5166 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
5168 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
5171 else if (info
->flags
& DF_BIND_NOW
)
5173 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
5179 if (info
->executable
)
5180 info
->flags_1
&= ~ (DF_1_INITFIRST
5183 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
5187 /* Work out the size of the version reference section. */
5189 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
5190 BFD_ASSERT (s
!= NULL
);
5192 struct elf_find_verdep_info sinfo
;
5194 sinfo
.output_bfd
= output_bfd
;
5196 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
5197 if (sinfo
.vers
== 0)
5199 sinfo
.failed
= FALSE
;
5201 elf_link_hash_traverse (elf_hash_table (info
),
5202 _bfd_elf_link_find_version_dependencies
,
5205 if (elf_tdata (output_bfd
)->verref
== NULL
)
5206 _bfd_strip_section_from_output (info
, s
);
5209 Elf_Internal_Verneed
*t
;
5214 /* Build the version definition section. */
5217 for (t
= elf_tdata (output_bfd
)->verref
;
5221 Elf_Internal_Vernaux
*a
;
5223 size
+= sizeof (Elf_External_Verneed
);
5225 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5226 size
+= sizeof (Elf_External_Vernaux
);
5229 s
->_raw_size
= size
;
5230 s
->contents
= bfd_alloc (output_bfd
, s
->_raw_size
);
5231 if (s
->contents
== NULL
)
5235 for (t
= elf_tdata (output_bfd
)->verref
;
5240 Elf_Internal_Vernaux
*a
;
5244 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5247 t
->vn_version
= VER_NEED_CURRENT
;
5249 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5250 elf_dt_name (t
->vn_bfd
) != NULL
5251 ? elf_dt_name (t
->vn_bfd
)
5252 : basename (t
->vn_bfd
->filename
),
5254 if (indx
== (bfd_size_type
) -1)
5257 t
->vn_aux
= sizeof (Elf_External_Verneed
);
5258 if (t
->vn_nextref
== NULL
)
5261 t
->vn_next
= (sizeof (Elf_External_Verneed
)
5262 + caux
* sizeof (Elf_External_Vernaux
));
5264 _bfd_elf_swap_verneed_out (output_bfd
, t
,
5265 (Elf_External_Verneed
*) p
);
5266 p
+= sizeof (Elf_External_Verneed
);
5268 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5270 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
5271 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5272 a
->vna_nodename
, FALSE
);
5273 if (indx
== (bfd_size_type
) -1)
5276 if (a
->vna_nextptr
== NULL
)
5279 a
->vna_next
= sizeof (Elf_External_Vernaux
);
5281 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
5282 (Elf_External_Vernaux
*) p
);
5283 p
+= sizeof (Elf_External_Vernaux
);
5287 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
5288 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
5291 elf_tdata (output_bfd
)->cverrefs
= crefs
;
5295 /* Assign dynsym indicies. In a shared library we generate a
5296 section symbol for each output section, which come first.
5297 Next come all of the back-end allocated local dynamic syms,
5298 followed by the rest of the global symbols. */
5300 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5302 /* Work out the size of the symbol version section. */
5303 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
5304 BFD_ASSERT (s
!= NULL
);
5305 if (dynsymcount
== 0
5306 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
5308 _bfd_strip_section_from_output (info
, s
);
5309 /* The DYNSYMCOUNT might have changed if we were going to
5310 output a dynamic symbol table entry for S. */
5311 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5315 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
5316 s
->contents
= bfd_zalloc (output_bfd
, s
->_raw_size
);
5317 if (s
->contents
== NULL
)
5320 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
5324 /* Set the size of the .dynsym and .hash sections. We counted
5325 the number of dynamic symbols in elf_link_add_object_symbols.
5326 We will build the contents of .dynsym and .hash when we build
5327 the final symbol table, because until then we do not know the
5328 correct value to give the symbols. We built the .dynstr
5329 section as we went along in elf_link_add_object_symbols. */
5330 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
5331 BFD_ASSERT (s
!= NULL
);
5332 s
->_raw_size
= dynsymcount
* bed
->s
->sizeof_sym
;
5333 s
->contents
= bfd_alloc (output_bfd
, s
->_raw_size
);
5334 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
5337 if (dynsymcount
!= 0)
5339 Elf_Internal_Sym isym
;
5341 /* The first entry in .dynsym is a dummy symbol. */
5348 bed
->s
->swap_symbol_out (output_bfd
, &isym
, s
->contents
, 0);
5351 /* Compute the size of the hashing table. As a side effect this
5352 computes the hash values for all the names we export. */
5353 bucketcount
= compute_bucket_count (info
);
5355 s
= bfd_get_section_by_name (dynobj
, ".hash");
5356 BFD_ASSERT (s
!= NULL
);
5357 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
5358 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
5359 s
->contents
= bfd_zalloc (output_bfd
, s
->_raw_size
);
5360 if (s
->contents
== NULL
)
5363 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
5364 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
5365 s
->contents
+ hash_entry_size
);
5367 elf_hash_table (info
)->bucketcount
= bucketcount
;
5369 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
5370 BFD_ASSERT (s
!= NULL
);
5372 elf_finalize_dynstr (output_bfd
, info
);
5374 s
->_raw_size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5376 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
5377 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
5384 /* Final phase of ELF linker. */
5386 /* A structure we use to avoid passing large numbers of arguments. */
5388 struct elf_final_link_info
5390 /* General link information. */
5391 struct bfd_link_info
*info
;
5394 /* Symbol string table. */
5395 struct bfd_strtab_hash
*symstrtab
;
5396 /* .dynsym section. */
5397 asection
*dynsym_sec
;
5398 /* .hash section. */
5400 /* symbol version section (.gnu.version). */
5401 asection
*symver_sec
;
5402 /* Buffer large enough to hold contents of any section. */
5404 /* Buffer large enough to hold external relocs of any section. */
5405 void *external_relocs
;
5406 /* Buffer large enough to hold internal relocs of any section. */
5407 Elf_Internal_Rela
*internal_relocs
;
5408 /* Buffer large enough to hold external local symbols of any input
5410 bfd_byte
*external_syms
;
5411 /* And a buffer for symbol section indices. */
5412 Elf_External_Sym_Shndx
*locsym_shndx
;
5413 /* Buffer large enough to hold internal local symbols of any input
5415 Elf_Internal_Sym
*internal_syms
;
5416 /* Array large enough to hold a symbol index for each local symbol
5417 of any input BFD. */
5419 /* Array large enough to hold a section pointer for each local
5420 symbol of any input BFD. */
5421 asection
**sections
;
5422 /* Buffer to hold swapped out symbols. */
5424 /* And one for symbol section indices. */
5425 Elf_External_Sym_Shndx
*symshndxbuf
;
5426 /* Number of swapped out symbols in buffer. */
5427 size_t symbuf_count
;
5428 /* Number of symbols which fit in symbuf. */
5430 /* And same for symshndxbuf. */
5431 size_t shndxbuf_size
;
5434 /* This struct is used to pass information to elf_link_output_extsym. */
5436 struct elf_outext_info
5439 bfd_boolean localsyms
;
5440 struct elf_final_link_info
*finfo
;
5443 /* When performing a relocatable link, the input relocations are
5444 preserved. But, if they reference global symbols, the indices
5445 referenced must be updated. Update all the relocations in
5446 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
5449 elf_link_adjust_relocs (bfd
*abfd
,
5450 Elf_Internal_Shdr
*rel_hdr
,
5452 struct elf_link_hash_entry
**rel_hash
)
5455 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5457 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5458 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5459 bfd_vma r_type_mask
;
5462 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
5464 swap_in
= bed
->s
->swap_reloc_in
;
5465 swap_out
= bed
->s
->swap_reloc_out
;
5467 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
5469 swap_in
= bed
->s
->swap_reloca_in
;
5470 swap_out
= bed
->s
->swap_reloca_out
;
5475 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
5478 if (bed
->s
->arch_size
== 32)
5485 r_type_mask
= 0xffffffff;
5489 erela
= rel_hdr
->contents
;
5490 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
5492 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
5495 if (*rel_hash
== NULL
)
5498 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
5500 (*swap_in
) (abfd
, erela
, irela
);
5501 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
5502 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
5503 | (irela
[j
].r_info
& r_type_mask
));
5504 (*swap_out
) (abfd
, irela
, erela
);
5508 struct elf_link_sort_rela
5514 enum elf_reloc_type_class type
;
5515 /* We use this as an array of size int_rels_per_ext_rel. */
5516 Elf_Internal_Rela rela
[1];
5520 elf_link_sort_cmp1 (const void *A
, const void *B
)
5522 const struct elf_link_sort_rela
*a
= A
;
5523 const struct elf_link_sort_rela
*b
= B
;
5524 int relativea
, relativeb
;
5526 relativea
= a
->type
== reloc_class_relative
;
5527 relativeb
= b
->type
== reloc_class_relative
;
5529 if (relativea
< relativeb
)
5531 if (relativea
> relativeb
)
5533 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
5535 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
5537 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5539 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5545 elf_link_sort_cmp2 (const void *A
, const void *B
)
5547 const struct elf_link_sort_rela
*a
= A
;
5548 const struct elf_link_sort_rela
*b
= B
;
5551 if (a
->u
.offset
< b
->u
.offset
)
5553 if (a
->u
.offset
> b
->u
.offset
)
5555 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
5556 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
5561 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5563 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5569 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
5572 bfd_size_type count
, size
;
5573 size_t i
, ret
, sort_elt
, ext_size
;
5574 bfd_byte
*sort
, *s_non_relative
, *p
;
5575 struct elf_link_sort_rela
*sq
;
5576 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5577 int i2e
= bed
->s
->int_rels_per_ext_rel
;
5578 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5579 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5580 struct bfd_link_order
*lo
;
5583 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
5584 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
5586 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
5587 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
5589 ext_size
= bed
->s
->sizeof_rel
;
5590 swap_in
= bed
->s
->swap_reloc_in
;
5591 swap_out
= bed
->s
->swap_reloc_out
;
5595 ext_size
= bed
->s
->sizeof_rela
;
5596 swap_in
= bed
->s
->swap_reloca_in
;
5597 swap_out
= bed
->s
->swap_reloca_out
;
5599 count
= reldyn
->_raw_size
/ ext_size
;
5602 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5603 if (lo
->type
== bfd_indirect_link_order
)
5605 asection
*o
= lo
->u
.indirect
.section
;
5606 size
+= o
->_raw_size
;
5609 if (size
!= reldyn
->_raw_size
)
5612 sort_elt
= (sizeof (struct elf_link_sort_rela
)
5613 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
5614 sort
= bfd_zmalloc (sort_elt
* count
);
5617 (*info
->callbacks
->warning
)
5618 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
5622 if (bed
->s
->arch_size
== 32)
5623 r_sym_mask
= ~(bfd_vma
) 0xff;
5625 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
5627 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5628 if (lo
->type
== bfd_indirect_link_order
)
5630 bfd_byte
*erel
, *erelend
;
5631 asection
*o
= lo
->u
.indirect
.section
;
5634 erelend
= o
->contents
+ o
->_raw_size
;
5635 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5636 while (erel
< erelend
)
5638 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5639 (*swap_in
) (abfd
, erel
, s
->rela
);
5640 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
5641 s
->u
.sym_mask
= r_sym_mask
;
5647 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
5649 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
5651 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5652 if (s
->type
!= reloc_class_relative
)
5658 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
5659 for (; i
< count
; i
++, p
+= sort_elt
)
5661 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
5662 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
5664 sp
->u
.offset
= sq
->rela
->r_offset
;
5667 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
5669 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5670 if (lo
->type
== bfd_indirect_link_order
)
5672 bfd_byte
*erel
, *erelend
;
5673 asection
*o
= lo
->u
.indirect
.section
;
5676 erelend
= o
->contents
+ o
->_raw_size
;
5677 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5678 while (erel
< erelend
)
5680 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5681 (*swap_out
) (abfd
, s
->rela
, erel
);
5692 /* Flush the output symbols to the file. */
5695 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
5696 const struct elf_backend_data
*bed
)
5698 if (finfo
->symbuf_count
> 0)
5700 Elf_Internal_Shdr
*hdr
;
5704 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5705 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5706 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
5707 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5708 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5711 hdr
->sh_size
+= amt
;
5712 finfo
->symbuf_count
= 0;
5718 /* Add a symbol to the output symbol table. */
5721 elf_link_output_sym (struct elf_final_link_info
*finfo
,
5723 Elf_Internal_Sym
*elfsym
,
5724 asection
*input_sec
,
5725 struct elf_link_hash_entry
*h
)
5728 Elf_External_Sym_Shndx
*destshndx
;
5729 bfd_boolean (*output_symbol_hook
)
5730 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
5731 struct elf_link_hash_entry
*);
5732 const struct elf_backend_data
*bed
;
5734 bed
= get_elf_backend_data (finfo
->output_bfd
);
5735 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
5736 if (output_symbol_hook
!= NULL
)
5738 if (! (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
))
5742 if (name
== NULL
|| *name
== '\0')
5743 elfsym
->st_name
= 0;
5744 else if (input_sec
->flags
& SEC_EXCLUDE
)
5745 elfsym
->st_name
= 0;
5748 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5750 if (elfsym
->st_name
== (unsigned long) -1)
5754 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5756 if (! elf_link_flush_output_syms (finfo
, bed
))
5760 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
5761 destshndx
= finfo
->symshndxbuf
;
5762 if (destshndx
!= NULL
)
5764 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
5768 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
5769 finfo
->symshndxbuf
= destshndx
= bfd_realloc (destshndx
, amt
* 2);
5770 if (destshndx
== NULL
)
5772 memset ((char *) destshndx
+ amt
, 0, amt
);
5773 finfo
->shndxbuf_size
*= 2;
5775 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
5778 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
5779 finfo
->symbuf_count
+= 1;
5780 bfd_get_symcount (finfo
->output_bfd
) += 1;
5785 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
5786 allowing an unsatisfied unversioned symbol in the DSO to match a
5787 versioned symbol that would normally require an explicit version.
5788 We also handle the case that a DSO references a hidden symbol
5789 which may be satisfied by a versioned symbol in another DSO. */
5792 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
5793 const struct elf_backend_data
*bed
,
5794 struct elf_link_hash_entry
*h
)
5797 struct elf_link_loaded_list
*loaded
;
5799 if (!is_elf_hash_table (info
->hash
))
5802 switch (h
->root
.type
)
5808 case bfd_link_hash_undefined
:
5809 case bfd_link_hash_undefweak
:
5810 abfd
= h
->root
.u
.undef
.abfd
;
5811 if ((abfd
->flags
& DYNAMIC
) == 0
5812 || elf_dyn_lib_class (abfd
) != DYN_DT_NEEDED
)
5816 case bfd_link_hash_defined
:
5817 case bfd_link_hash_defweak
:
5818 abfd
= h
->root
.u
.def
.section
->owner
;
5821 case bfd_link_hash_common
:
5822 abfd
= h
->root
.u
.c
.p
->section
->owner
;
5825 BFD_ASSERT (abfd
!= NULL
);
5827 for (loaded
= elf_hash_table (info
)->loaded
;
5829 loaded
= loaded
->next
)
5832 Elf_Internal_Shdr
*hdr
;
5833 bfd_size_type symcount
;
5834 bfd_size_type extsymcount
;
5835 bfd_size_type extsymoff
;
5836 Elf_Internal_Shdr
*versymhdr
;
5837 Elf_Internal_Sym
*isym
;
5838 Elf_Internal_Sym
*isymend
;
5839 Elf_Internal_Sym
*isymbuf
;
5840 Elf_External_Versym
*ever
;
5841 Elf_External_Versym
*extversym
;
5843 input
= loaded
->abfd
;
5845 /* We check each DSO for a possible hidden versioned definition. */
5847 || (input
->flags
& DYNAMIC
) == 0
5848 || elf_dynversym (input
) == 0)
5851 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
5853 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
5854 if (elf_bad_symtab (input
))
5856 extsymcount
= symcount
;
5861 extsymcount
= symcount
- hdr
->sh_info
;
5862 extsymoff
= hdr
->sh_info
;
5865 if (extsymcount
== 0)
5868 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
5870 if (isymbuf
== NULL
)
5873 /* Read in any version definitions. */
5874 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
5875 extversym
= bfd_malloc (versymhdr
->sh_size
);
5876 if (extversym
== NULL
)
5879 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
5880 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
5881 != versymhdr
->sh_size
))
5889 ever
= extversym
+ extsymoff
;
5890 isymend
= isymbuf
+ extsymcount
;
5891 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
5894 Elf_Internal_Versym iver
;
5895 unsigned short version_index
;
5897 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
5898 || isym
->st_shndx
== SHN_UNDEF
)
5901 name
= bfd_elf_string_from_elf_section (input
,
5904 if (strcmp (name
, h
->root
.root
.string
) != 0)
5907 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
5909 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
5911 /* If we have a non-hidden versioned sym, then it should
5912 have provided a definition for the undefined sym. */
5916 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
5917 if (version_index
== 1 || version_index
== 2)
5919 /* This is the base or first version. We can use it. */
5933 /* Add an external symbol to the symbol table. This is called from
5934 the hash table traversal routine. When generating a shared object,
5935 we go through the symbol table twice. The first time we output
5936 anything that might have been forced to local scope in a version
5937 script. The second time we output the symbols that are still
5941 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
5943 struct elf_outext_info
*eoinfo
= data
;
5944 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5946 Elf_Internal_Sym sym
;
5947 asection
*input_sec
;
5948 const struct elf_backend_data
*bed
;
5950 if (h
->root
.type
== bfd_link_hash_warning
)
5952 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5953 if (h
->root
.type
== bfd_link_hash_new
)
5957 /* Decide whether to output this symbol in this pass. */
5958 if (eoinfo
->localsyms
)
5960 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5965 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5969 bed
= get_elf_backend_data (finfo
->output_bfd
);
5971 /* If we have an undefined symbol reference here then it must have
5972 come from a shared library that is being linked in. (Undefined
5973 references in regular files have already been handled). If we
5974 are reporting errors for this situation then do so now. */
5975 if (h
->root
.type
== bfd_link_hash_undefined
5976 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5977 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
5978 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
5979 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
5981 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5982 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5983 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
5985 eoinfo
->failed
= TRUE
;
5990 /* We should also warn if a forced local symbol is referenced from
5991 shared libraries. */
5992 if (! finfo
->info
->relocatable
5993 && (! finfo
->info
->shared
)
5994 && (h
->elf_link_hash_flags
5995 & (ELF_LINK_FORCED_LOCAL
| ELF_LINK_HASH_REF_DYNAMIC
| ELF_LINK_DYNAMIC_DEF
| ELF_LINK_DYNAMIC_WEAK
))
5996 == (ELF_LINK_FORCED_LOCAL
| ELF_LINK_HASH_REF_DYNAMIC
)
5997 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
5999 (*_bfd_error_handler
)
6000 (_("%s: %s symbol `%s' in %s is referenced by DSO"),
6001 bfd_get_filename (finfo
->output_bfd
),
6002 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
6004 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
6005 ? "hidden" : "local",
6006 h
->root
.root
.string
,
6007 bfd_archive_filename (h
->root
.u
.def
.section
->owner
));
6008 eoinfo
->failed
= TRUE
;
6012 /* We don't want to output symbols that have never been mentioned by
6013 a regular file, or that we have been told to strip. However, if
6014 h->indx is set to -2, the symbol is used by a reloc and we must
6018 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
6019 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
6020 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
6021 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
6023 else if (finfo
->info
->strip
== strip_all
)
6025 else if (finfo
->info
->strip
== strip_some
6026 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6027 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
6029 else if (finfo
->info
->strip_discarded
6030 && (h
->root
.type
== bfd_link_hash_defined
6031 || h
->root
.type
== bfd_link_hash_defweak
)
6032 && elf_discarded_section (h
->root
.u
.def
.section
))
6037 /* If we're stripping it, and it's not a dynamic symbol, there's
6038 nothing else to do unless it is a forced local symbol. */
6041 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6045 sym
.st_size
= h
->size
;
6046 sym
.st_other
= h
->other
;
6047 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6048 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6049 else if (h
->root
.type
== bfd_link_hash_undefweak
6050 || h
->root
.type
== bfd_link_hash_defweak
)
6051 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6053 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6055 switch (h
->root
.type
)
6058 case bfd_link_hash_new
:
6059 case bfd_link_hash_warning
:
6063 case bfd_link_hash_undefined
:
6064 case bfd_link_hash_undefweak
:
6065 input_sec
= bfd_und_section_ptr
;
6066 sym
.st_shndx
= SHN_UNDEF
;
6069 case bfd_link_hash_defined
:
6070 case bfd_link_hash_defweak
:
6072 input_sec
= h
->root
.u
.def
.section
;
6073 if (input_sec
->output_section
!= NULL
)
6076 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6077 input_sec
->output_section
);
6078 if (sym
.st_shndx
== SHN_BAD
)
6080 (*_bfd_error_handler
)
6081 (_("%s: could not find output section %s for input section %s"),
6082 bfd_get_filename (finfo
->output_bfd
),
6083 input_sec
->output_section
->name
,
6085 eoinfo
->failed
= TRUE
;
6089 /* ELF symbols in relocatable files are section relative,
6090 but in nonrelocatable files they are virtual
6092 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6093 if (! finfo
->info
->relocatable
)
6095 sym
.st_value
+= input_sec
->output_section
->vma
;
6096 if (h
->type
== STT_TLS
)
6098 /* STT_TLS symbols are relative to PT_TLS segment
6100 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6101 sym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6107 BFD_ASSERT (input_sec
->owner
== NULL
6108 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6109 sym
.st_shndx
= SHN_UNDEF
;
6110 input_sec
= bfd_und_section_ptr
;
6115 case bfd_link_hash_common
:
6116 input_sec
= h
->root
.u
.c
.p
->section
;
6117 sym
.st_shndx
= SHN_COMMON
;
6118 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6121 case bfd_link_hash_indirect
:
6122 /* These symbols are created by symbol versioning. They point
6123 to the decorated version of the name. For example, if the
6124 symbol foo@@GNU_1.2 is the default, which should be used when
6125 foo is used with no version, then we add an indirect symbol
6126 foo which points to foo@@GNU_1.2. We ignore these symbols,
6127 since the indirected symbol is already in the hash table. */
6131 /* Give the processor backend a chance to tweak the symbol value,
6132 and also to finish up anything that needs to be done for this
6133 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6134 forced local syms when non-shared is due to a historical quirk. */
6135 if ((h
->dynindx
!= -1
6136 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6137 && ((finfo
->info
->shared
6138 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
6139 || h
->root
.type
!= bfd_link_hash_undefweak
))
6140 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6141 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6143 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6144 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6146 eoinfo
->failed
= TRUE
;
6151 /* If we are marking the symbol as undefined, and there are no
6152 non-weak references to this symbol from a regular object, then
6153 mark the symbol as weak undefined; if there are non-weak
6154 references, mark the symbol as strong. We can't do this earlier,
6155 because it might not be marked as undefined until the
6156 finish_dynamic_symbol routine gets through with it. */
6157 if (sym
.st_shndx
== SHN_UNDEF
6158 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6159 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6160 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6164 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6165 bindtype
= STB_GLOBAL
;
6167 bindtype
= STB_WEAK
;
6168 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6171 /* If a non-weak symbol with non-default visibility is not defined
6172 locally, it is a fatal error. */
6173 if (! finfo
->info
->relocatable
6174 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
6175 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
6176 && h
->root
.type
== bfd_link_hash_undefined
6177 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6179 (*_bfd_error_handler
)
6180 (_("%s: %s symbol `%s' isn't defined"),
6181 bfd_get_filename (finfo
->output_bfd
),
6182 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
6184 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
6185 ? "internal" : "hidden",
6186 h
->root
.root
.string
);
6187 eoinfo
->failed
= TRUE
;
6191 /* If this symbol should be put in the .dynsym section, then put it
6192 there now. We already know the symbol index. We also fill in
6193 the entry in the .hash section. */
6194 if (h
->dynindx
!= -1
6195 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6199 size_t hash_entry_size
;
6200 bfd_byte
*bucketpos
;
6204 sym
.st_name
= h
->dynstr_index
;
6205 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
6206 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
6208 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6209 bucket
= h
->elf_hash_value
% bucketcount
;
6211 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6212 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6213 + (bucket
+ 2) * hash_entry_size
);
6214 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6215 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
6216 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6217 ((bfd_byte
*) finfo
->hash_sec
->contents
6218 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6220 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6222 Elf_Internal_Versym iversym
;
6223 Elf_External_Versym
*eversym
;
6225 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6227 if (h
->verinfo
.verdef
== NULL
)
6228 iversym
.vs_vers
= 0;
6230 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6234 if (h
->verinfo
.vertree
== NULL
)
6235 iversym
.vs_vers
= 1;
6237 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6240 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6241 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6243 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6244 eversym
+= h
->dynindx
;
6245 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6249 /* If we're stripping it, then it was just a dynamic symbol, and
6250 there's nothing else to do. */
6251 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
6254 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6256 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
))
6258 eoinfo
->failed
= TRUE
;
6266 elf_section_ignore_discarded_relocs (asection
*sec
)
6268 const struct elf_backend_data
*bed
;
6270 switch (sec
->sec_info_type
)
6272 case ELF_INFO_TYPE_STABS
:
6273 case ELF_INFO_TYPE_EH_FRAME
:
6279 bed
= get_elf_backend_data (sec
->owner
);
6280 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
6281 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
6287 /* Link an input file into the linker output file. This function
6288 handles all the sections and relocations of the input file at once.
6289 This is so that we only have to read the local symbols once, and
6290 don't have to keep them in memory. */
6293 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
6295 bfd_boolean (*relocate_section
)
6296 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
6297 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
6299 Elf_Internal_Shdr
*symtab_hdr
;
6302 Elf_Internal_Sym
*isymbuf
;
6303 Elf_Internal_Sym
*isym
;
6304 Elf_Internal_Sym
*isymend
;
6306 asection
**ppsection
;
6308 const struct elf_backend_data
*bed
;
6309 bfd_boolean emit_relocs
;
6310 struct elf_link_hash_entry
**sym_hashes
;
6312 output_bfd
= finfo
->output_bfd
;
6313 bed
= get_elf_backend_data (output_bfd
);
6314 relocate_section
= bed
->elf_backend_relocate_section
;
6316 /* If this is a dynamic object, we don't want to do anything here:
6317 we don't want the local symbols, and we don't want the section
6319 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6322 emit_relocs
= (finfo
->info
->relocatable
6323 || finfo
->info
->emitrelocations
6324 || bed
->elf_backend_emit_relocs
);
6326 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6327 if (elf_bad_symtab (input_bfd
))
6329 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
6334 locsymcount
= symtab_hdr
->sh_info
;
6335 extsymoff
= symtab_hdr
->sh_info
;
6338 /* Read the local symbols. */
6339 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6340 if (isymbuf
== NULL
&& locsymcount
!= 0)
6342 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6343 finfo
->internal_syms
,
6344 finfo
->external_syms
,
6345 finfo
->locsym_shndx
);
6346 if (isymbuf
== NULL
)
6350 /* Find local symbol sections and adjust values of symbols in
6351 SEC_MERGE sections. Write out those local symbols we know are
6352 going into the output file. */
6353 isymend
= isymbuf
+ locsymcount
;
6354 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
6356 isym
++, pindex
++, ppsection
++)
6360 Elf_Internal_Sym osym
;
6364 if (elf_bad_symtab (input_bfd
))
6366 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6373 if (isym
->st_shndx
== SHN_UNDEF
)
6374 isec
= bfd_und_section_ptr
;
6375 else if (isym
->st_shndx
< SHN_LORESERVE
6376 || isym
->st_shndx
> SHN_HIRESERVE
)
6378 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
6380 && isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
6381 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6383 _bfd_merged_section_offset (output_bfd
, &isec
,
6384 elf_section_data (isec
)->sec_info
,
6387 else if (isym
->st_shndx
== SHN_ABS
)
6388 isec
= bfd_abs_section_ptr
;
6389 else if (isym
->st_shndx
== SHN_COMMON
)
6390 isec
= bfd_com_section_ptr
;
6399 /* Don't output the first, undefined, symbol. */
6400 if (ppsection
== finfo
->sections
)
6403 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6405 /* We never output section symbols. Instead, we use the
6406 section symbol of the corresponding section in the output
6411 /* If we are stripping all symbols, we don't want to output this
6413 if (finfo
->info
->strip
== strip_all
)
6416 /* If we are discarding all local symbols, we don't want to
6417 output this one. If we are generating a relocatable output
6418 file, then some of the local symbols may be required by
6419 relocs; we output them below as we discover that they are
6421 if (finfo
->info
->discard
== discard_all
)
6424 /* If this symbol is defined in a section which we are
6425 discarding, we don't need to keep it, but note that
6426 linker_mark is only reliable for sections that have contents.
6427 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6428 as well as linker_mark. */
6429 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6431 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6432 || (! finfo
->info
->relocatable
6433 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6436 /* Get the name of the symbol. */
6437 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6442 /* See if we are discarding symbols with this name. */
6443 if ((finfo
->info
->strip
== strip_some
6444 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
6446 || (((finfo
->info
->discard
== discard_sec_merge
6447 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
6448 || finfo
->info
->discard
== discard_l
)
6449 && bfd_is_local_label_name (input_bfd
, name
)))
6452 /* If we get here, we are going to output this symbol. */
6456 /* Adjust the section index for the output file. */
6457 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6458 isec
->output_section
);
6459 if (osym
.st_shndx
== SHN_BAD
)
6462 *pindex
= bfd_get_symcount (output_bfd
);
6464 /* ELF symbols in relocatable files are section relative, but
6465 in executable files they are virtual addresses. Note that
6466 this code assumes that all ELF sections have an associated
6467 BFD section with a reasonable value for output_offset; below
6468 we assume that they also have a reasonable value for
6469 output_section. Any special sections must be set up to meet
6470 these requirements. */
6471 osym
.st_value
+= isec
->output_offset
;
6472 if (! finfo
->info
->relocatable
)
6474 osym
.st_value
+= isec
->output_section
->vma
;
6475 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
6477 /* STT_TLS symbols are relative to PT_TLS segment base. */
6478 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6479 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6483 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
))
6487 /* Relocate the contents of each section. */
6488 sym_hashes
= elf_sym_hashes (input_bfd
);
6489 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6493 if (! o
->linker_mark
)
6495 /* This section was omitted from the link. */
6499 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6500 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6503 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6505 /* Section was created by _bfd_elf_link_create_dynamic_sections
6510 /* Get the contents of the section. They have been cached by a
6511 relaxation routine. Note that o is a section in an input
6512 file, so the contents field will not have been set by any of
6513 the routines which work on output files. */
6514 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6515 contents
= elf_section_data (o
)->this_hdr
.contents
;
6518 contents
= finfo
->contents
;
6519 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0,
6524 if ((o
->flags
& SEC_RELOC
) != 0)
6526 Elf_Internal_Rela
*internal_relocs
;
6527 bfd_vma r_type_mask
;
6530 /* Get the swapped relocs. */
6532 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
6533 finfo
->internal_relocs
, FALSE
);
6534 if (internal_relocs
== NULL
6535 && o
->reloc_count
> 0)
6538 if (bed
->s
->arch_size
== 32)
6545 r_type_mask
= 0xffffffff;
6549 /* Run through the relocs looking for any against symbols
6550 from discarded sections and section symbols from
6551 removed link-once sections. Complain about relocs
6552 against discarded sections. Zero relocs against removed
6553 link-once sections. Preserve debug information as much
6555 if (!elf_section_ignore_discarded_relocs (o
))
6557 Elf_Internal_Rela
*rel
, *relend
;
6559 rel
= internal_relocs
;
6560 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6561 for ( ; rel
< relend
; rel
++)
6563 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
6566 if (r_symndx
>= locsymcount
6567 || (elf_bad_symtab (input_bfd
)
6568 && finfo
->sections
[r_symndx
] == NULL
))
6570 struct elf_link_hash_entry
*h
;
6572 h
= sym_hashes
[r_symndx
- extsymoff
];
6573 while (h
->root
.type
== bfd_link_hash_indirect
6574 || h
->root
.type
== bfd_link_hash_warning
)
6575 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6577 /* Complain if the definition comes from a
6578 discarded section. */
6579 sec
= h
->root
.u
.def
.section
;
6580 if ((h
->root
.type
== bfd_link_hash_defined
6581 || h
->root
.type
== bfd_link_hash_defweak
)
6582 && elf_discarded_section (sec
))
6584 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6586 BFD_ASSERT (r_symndx
!= 0);
6587 /* Try to preserve debug information. */
6588 if ((o
->flags
& SEC_DEBUGGING
) != 0
6589 && sec
->kept_section
!= NULL
6590 && sec
->_raw_size
== sec
->kept_section
->_raw_size
)
6591 h
->root
.u
.def
.section
6592 = sec
->kept_section
;
6594 memset (rel
, 0, sizeof (*rel
));
6597 finfo
->info
->callbacks
->error_handler
6598 (LD_DEFINITION_IN_DISCARDED_SECTION
,
6599 _("%T: discarded in section `%s' from %s\n"),
6600 h
->root
.root
.string
,
6601 h
->root
.root
.string
,
6602 h
->root
.u
.def
.section
->name
,
6603 bfd_archive_filename (h
->root
.u
.def
.section
->owner
));
6608 sec
= finfo
->sections
[r_symndx
];
6610 if (sec
!= NULL
&& elf_discarded_section (sec
))
6612 if ((o
->flags
& SEC_DEBUGGING
) != 0
6613 || (sec
->flags
& SEC_LINK_ONCE
) != 0)
6615 BFD_ASSERT (r_symndx
!= 0);
6616 /* Try to preserve debug information. */
6617 if ((o
->flags
& SEC_DEBUGGING
) != 0
6618 && sec
->kept_section
!= NULL
6619 && sec
->_raw_size
== sec
->kept_section
->_raw_size
)
6620 finfo
->sections
[r_symndx
]
6621 = sec
->kept_section
;
6624 rel
->r_info
&= r_type_mask
;
6634 ok
= asprintf (&buf
, "local symbol %d",
6637 buf
= (char *) "local symbol";
6638 finfo
->info
->callbacks
->error_handler
6639 (LD_DEFINITION_IN_DISCARDED_SECTION
,
6640 _("%T: discarded in section `%s' from %s\n"),
6641 buf
, buf
, sec
->name
,
6642 bfd_archive_filename (input_bfd
));
6651 /* Relocate the section by invoking a back end routine.
6653 The back end routine is responsible for adjusting the
6654 section contents as necessary, and (if using Rela relocs
6655 and generating a relocatable output file) adjusting the
6656 reloc addend as necessary.
6658 The back end routine does not have to worry about setting
6659 the reloc address or the reloc symbol index.
6661 The back end routine is given a pointer to the swapped in
6662 internal symbols, and can access the hash table entries
6663 for the external symbols via elf_sym_hashes (input_bfd).
6665 When generating relocatable output, the back end routine
6666 must handle STB_LOCAL/STT_SECTION symbols specially. The
6667 output symbol is going to be a section symbol
6668 corresponding to the output section, which will require
6669 the addend to be adjusted. */
6671 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6672 input_bfd
, o
, contents
,
6680 Elf_Internal_Rela
*irela
;
6681 Elf_Internal_Rela
*irelaend
;
6682 bfd_vma last_offset
;
6683 struct elf_link_hash_entry
**rel_hash
;
6684 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
6685 unsigned int next_erel
;
6686 bfd_boolean (*reloc_emitter
)
6687 (bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*);
6688 bfd_boolean rela_normal
;
6690 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6691 rela_normal
= (bed
->rela_normal
6692 && (input_rel_hdr
->sh_entsize
6693 == bed
->s
->sizeof_rela
));
6695 /* Adjust the reloc addresses and symbol indices. */
6697 irela
= internal_relocs
;
6698 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6699 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6700 + elf_section_data (o
->output_section
)->rel_count
6701 + elf_section_data (o
->output_section
)->rel_count2
);
6702 last_offset
= o
->output_offset
;
6703 if (!finfo
->info
->relocatable
)
6704 last_offset
+= o
->output_section
->vma
;
6705 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6707 unsigned long r_symndx
;
6709 Elf_Internal_Sym sym
;
6711 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6717 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
6720 if (irela
->r_offset
>= (bfd_vma
) -2)
6722 /* This is a reloc for a deleted entry or somesuch.
6723 Turn it into an R_*_NONE reloc, at the same
6724 offset as the last reloc. elf_eh_frame.c and
6725 elf_bfd_discard_info rely on reloc offsets
6727 irela
->r_offset
= last_offset
;
6729 irela
->r_addend
= 0;
6733 irela
->r_offset
+= o
->output_offset
;
6735 /* Relocs in an executable have to be virtual addresses. */
6736 if (!finfo
->info
->relocatable
)
6737 irela
->r_offset
+= o
->output_section
->vma
;
6739 last_offset
= irela
->r_offset
;
6741 r_symndx
= irela
->r_info
>> r_sym_shift
;
6742 if (r_symndx
== STN_UNDEF
)
6745 if (r_symndx
>= locsymcount
6746 || (elf_bad_symtab (input_bfd
)
6747 && finfo
->sections
[r_symndx
] == NULL
))
6749 struct elf_link_hash_entry
*rh
;
6752 /* This is a reloc against a global symbol. We
6753 have not yet output all the local symbols, so
6754 we do not know the symbol index of any global
6755 symbol. We set the rel_hash entry for this
6756 reloc to point to the global hash table entry
6757 for this symbol. The symbol index is then
6758 set at the end of elf_bfd_final_link. */
6759 indx
= r_symndx
- extsymoff
;
6760 rh
= elf_sym_hashes (input_bfd
)[indx
];
6761 while (rh
->root
.type
== bfd_link_hash_indirect
6762 || rh
->root
.type
== bfd_link_hash_warning
)
6763 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6765 /* Setting the index to -2 tells
6766 elf_link_output_extsym that this symbol is
6768 BFD_ASSERT (rh
->indx
< 0);
6776 /* This is a reloc against a local symbol. */
6779 sym
= isymbuf
[r_symndx
];
6780 sec
= finfo
->sections
[r_symndx
];
6781 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
6783 /* I suppose the backend ought to fill in the
6784 section of any STT_SECTION symbol against a
6785 processor specific section. */
6787 if (bfd_is_abs_section (sec
))
6789 else if (sec
== NULL
|| sec
->owner
== NULL
)
6791 bfd_set_error (bfd_error_bad_value
);
6796 asection
*osec
= sec
->output_section
;
6798 /* If we have discarded a section, the output
6799 section will be the absolute section. In
6800 case of discarded link-once and discarded
6801 SEC_MERGE sections, use the kept section. */
6802 if (bfd_is_abs_section (osec
)
6803 && sec
->kept_section
!= NULL
6804 && sec
->kept_section
->output_section
!= NULL
)
6806 osec
= sec
->kept_section
->output_section
;
6807 irela
->r_addend
-= osec
->vma
;
6810 if (!bfd_is_abs_section (osec
))
6812 r_symndx
= osec
->target_index
;
6813 BFD_ASSERT (r_symndx
!= 0);
6817 /* Adjust the addend according to where the
6818 section winds up in the output section. */
6820 irela
->r_addend
+= sec
->output_offset
;
6824 if (finfo
->indices
[r_symndx
] == -1)
6826 unsigned long shlink
;
6830 if (finfo
->info
->strip
== strip_all
)
6832 /* You can't do ld -r -s. */
6833 bfd_set_error (bfd_error_invalid_operation
);
6837 /* This symbol was skipped earlier, but
6838 since it is needed by a reloc, we
6839 must output it now. */
6840 shlink
= symtab_hdr
->sh_link
;
6841 name
= (bfd_elf_string_from_elf_section
6842 (input_bfd
, shlink
, sym
.st_name
));
6846 osec
= sec
->output_section
;
6848 _bfd_elf_section_from_bfd_section (output_bfd
,
6850 if (sym
.st_shndx
== SHN_BAD
)
6853 sym
.st_value
+= sec
->output_offset
;
6854 if (! finfo
->info
->relocatable
)
6856 sym
.st_value
+= osec
->vma
;
6857 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
6859 /* STT_TLS symbols are relative to PT_TLS
6861 BFD_ASSERT (elf_hash_table (finfo
->info
)
6863 sym
.st_value
-= (elf_hash_table (finfo
->info
)
6868 finfo
->indices
[r_symndx
]
6869 = bfd_get_symcount (output_bfd
);
6871 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
,
6876 r_symndx
= finfo
->indices
[r_symndx
];
6879 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
6880 | (irela
->r_info
& r_type_mask
));
6883 /* Swap out the relocs. */
6884 if (bed
->elf_backend_emit_relocs
6885 && !(finfo
->info
->relocatable
6886 || finfo
->info
->emitrelocations
))
6887 reloc_emitter
= bed
->elf_backend_emit_relocs
;
6889 reloc_emitter
= _bfd_elf_link_output_relocs
;
6891 if (input_rel_hdr
->sh_size
!= 0
6892 && ! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
6896 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
6897 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
6899 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
6900 * bed
->s
->int_rels_per_ext_rel
);
6901 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr2
,
6908 /* Write out the modified section contents. */
6909 if (bed
->elf_backend_write_section
6910 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
6912 /* Section written out. */
6914 else switch (o
->sec_info_type
)
6916 case ELF_INFO_TYPE_STABS
:
6917 if (! (_bfd_write_section_stabs
6919 &elf_hash_table (finfo
->info
)->stab_info
,
6920 o
, &elf_section_data (o
)->sec_info
, contents
)))
6923 case ELF_INFO_TYPE_MERGE
:
6924 if (! _bfd_write_merged_section (output_bfd
, o
,
6925 elf_section_data (o
)->sec_info
))
6928 case ELF_INFO_TYPE_EH_FRAME
:
6930 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
6937 bfd_size_type sec_size
;
6939 sec_size
= (o
->_cooked_size
!= 0 ? o
->_cooked_size
: o
->_raw_size
);
6940 if (! (o
->flags
& SEC_EXCLUDE
)
6941 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
6943 (file_ptr
) o
->output_offset
,
6954 /* Generate a reloc when linking an ELF file. This is a reloc
6955 requested by the linker, and does come from any input file. This
6956 is used to build constructor and destructor tables when linking
6960 elf_reloc_link_order (bfd
*output_bfd
,
6961 struct bfd_link_info
*info
,
6962 asection
*output_section
,
6963 struct bfd_link_order
*link_order
)
6965 reloc_howto_type
*howto
;
6969 struct elf_link_hash_entry
**rel_hash_ptr
;
6970 Elf_Internal_Shdr
*rel_hdr
;
6971 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
6972 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
6976 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
6979 bfd_set_error (bfd_error_bad_value
);
6983 addend
= link_order
->u
.reloc
.p
->addend
;
6985 /* Figure out the symbol index. */
6986 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
6987 + elf_section_data (output_section
)->rel_count
6988 + elf_section_data (output_section
)->rel_count2
);
6989 if (link_order
->type
== bfd_section_reloc_link_order
)
6991 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
6992 BFD_ASSERT (indx
!= 0);
6993 *rel_hash_ptr
= NULL
;
6997 struct elf_link_hash_entry
*h
;
6999 /* Treat a reloc against a defined symbol as though it were
7000 actually against the section. */
7001 h
= ((struct elf_link_hash_entry
*)
7002 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7003 link_order
->u
.reloc
.p
->u
.name
,
7004 FALSE
, FALSE
, TRUE
));
7006 && (h
->root
.type
== bfd_link_hash_defined
7007 || h
->root
.type
== bfd_link_hash_defweak
))
7011 section
= h
->root
.u
.def
.section
;
7012 indx
= section
->output_section
->target_index
;
7013 *rel_hash_ptr
= NULL
;
7014 /* It seems that we ought to add the symbol value to the
7015 addend here, but in practice it has already been added
7016 because it was passed to constructor_callback. */
7017 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7021 /* Setting the index to -2 tells elf_link_output_extsym that
7022 this symbol is used by a reloc. */
7029 if (! ((*info
->callbacks
->unattached_reloc
)
7030 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
7036 /* If this is an inplace reloc, we must write the addend into the
7038 if (howto
->partial_inplace
&& addend
!= 0)
7041 bfd_reloc_status_type rstat
;
7044 const char *sym_name
;
7046 size
= bfd_get_reloc_size (howto
);
7047 buf
= bfd_zmalloc (size
);
7050 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
7057 case bfd_reloc_outofrange
:
7060 case bfd_reloc_overflow
:
7061 if (link_order
->type
== bfd_section_reloc_link_order
)
7062 sym_name
= bfd_section_name (output_bfd
,
7063 link_order
->u
.reloc
.p
->u
.section
);
7065 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7066 if (! ((*info
->callbacks
->reloc_overflow
)
7067 (info
, sym_name
, howto
->name
, addend
, NULL
, NULL
, 0)))
7074 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
7075 link_order
->offset
, size
);
7081 /* The address of a reloc is relative to the section in a
7082 relocatable file, and is a virtual address in an executable
7084 offset
= link_order
->offset
;
7085 if (! info
->relocatable
)
7086 offset
+= output_section
->vma
;
7088 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7090 irel
[i
].r_offset
= offset
;
7092 irel
[i
].r_addend
= 0;
7094 if (bed
->s
->arch_size
== 32)
7095 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
7097 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
7099 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7100 erel
= rel_hdr
->contents
;
7101 if (rel_hdr
->sh_type
== SHT_REL
)
7103 erel
+= (elf_section_data (output_section
)->rel_count
7104 * bed
->s
->sizeof_rel
);
7105 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
7109 irel
[0].r_addend
= addend
;
7110 erel
+= (elf_section_data (output_section
)->rel_count
7111 * bed
->s
->sizeof_rela
);
7112 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
7115 ++elf_section_data (output_section
)->rel_count
;
7120 /* Do the final step of an ELF link. */
7123 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
7125 bfd_boolean dynamic
;
7126 bfd_boolean emit_relocs
;
7128 struct elf_final_link_info finfo
;
7129 register asection
*o
;
7130 register struct bfd_link_order
*p
;
7132 bfd_size_type max_contents_size
;
7133 bfd_size_type max_external_reloc_size
;
7134 bfd_size_type max_internal_reloc_count
;
7135 bfd_size_type max_sym_count
;
7136 bfd_size_type max_sym_shndx_count
;
7138 Elf_Internal_Sym elfsym
;
7140 Elf_Internal_Shdr
*symtab_hdr
;
7141 Elf_Internal_Shdr
*symtab_shndx_hdr
;
7142 Elf_Internal_Shdr
*symstrtab_hdr
;
7143 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7144 struct elf_outext_info eoinfo
;
7146 size_t relativecount
= 0;
7147 asection
*reldyn
= 0;
7150 if (! is_elf_hash_table (info
->hash
))
7154 abfd
->flags
|= DYNAMIC
;
7156 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
7157 dynobj
= elf_hash_table (info
)->dynobj
;
7159 emit_relocs
= (info
->relocatable
7160 || info
->emitrelocations
7161 || bed
->elf_backend_emit_relocs
);
7164 finfo
.output_bfd
= abfd
;
7165 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
7166 if (finfo
.symstrtab
== NULL
)
7171 finfo
.dynsym_sec
= NULL
;
7172 finfo
.hash_sec
= NULL
;
7173 finfo
.symver_sec
= NULL
;
7177 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
7178 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
7179 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
7180 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
7181 /* Note that it is OK if symver_sec is NULL. */
7184 finfo
.contents
= NULL
;
7185 finfo
.external_relocs
= NULL
;
7186 finfo
.internal_relocs
= NULL
;
7187 finfo
.external_syms
= NULL
;
7188 finfo
.locsym_shndx
= NULL
;
7189 finfo
.internal_syms
= NULL
;
7190 finfo
.indices
= NULL
;
7191 finfo
.sections
= NULL
;
7192 finfo
.symbuf
= NULL
;
7193 finfo
.symshndxbuf
= NULL
;
7194 finfo
.symbuf_count
= 0;
7195 finfo
.shndxbuf_size
= 0;
7197 /* Count up the number of relocations we will output for each output
7198 section, so that we know the sizes of the reloc sections. We
7199 also figure out some maximum sizes. */
7200 max_contents_size
= 0;
7201 max_external_reloc_size
= 0;
7202 max_internal_reloc_count
= 0;
7204 max_sym_shndx_count
= 0;
7206 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7208 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
7211 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7213 unsigned int reloc_count
= 0;
7214 struct bfd_elf_section_data
*esdi
= NULL
;
7215 unsigned int *rel_count1
;
7217 if (p
->type
== bfd_section_reloc_link_order
7218 || p
->type
== bfd_symbol_reloc_link_order
)
7220 else if (p
->type
== bfd_indirect_link_order
)
7224 sec
= p
->u
.indirect
.section
;
7225 esdi
= elf_section_data (sec
);
7227 /* Mark all sections which are to be included in the
7228 link. This will normally be every section. We need
7229 to do this so that we can identify any sections which
7230 the linker has decided to not include. */
7231 sec
->linker_mark
= TRUE
;
7233 if (sec
->flags
& SEC_MERGE
)
7236 if (info
->relocatable
|| info
->emitrelocations
)
7237 reloc_count
= sec
->reloc_count
;
7238 else if (bed
->elf_backend_count_relocs
)
7240 Elf_Internal_Rela
* relocs
;
7242 relocs
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
7245 reloc_count
= (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
7247 if (elf_section_data (o
)->relocs
!= relocs
)
7251 if (sec
->_raw_size
> max_contents_size
)
7252 max_contents_size
= sec
->_raw_size
;
7253 if (sec
->_cooked_size
> max_contents_size
)
7254 max_contents_size
= sec
->_cooked_size
;
7256 /* We are interested in just local symbols, not all
7258 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
7259 && (sec
->owner
->flags
& DYNAMIC
) == 0)
7263 if (elf_bad_symtab (sec
->owner
))
7264 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
7265 / bed
->s
->sizeof_sym
);
7267 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
7269 if (sym_count
> max_sym_count
)
7270 max_sym_count
= sym_count
;
7272 if (sym_count
> max_sym_shndx_count
7273 && elf_symtab_shndx (sec
->owner
) != 0)
7274 max_sym_shndx_count
= sym_count
;
7276 if ((sec
->flags
& SEC_RELOC
) != 0)
7280 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
7281 if (ext_size
> max_external_reloc_size
)
7282 max_external_reloc_size
= ext_size
;
7283 if (sec
->reloc_count
> max_internal_reloc_count
)
7284 max_internal_reloc_count
= sec
->reloc_count
;
7289 if (reloc_count
== 0)
7292 o
->reloc_count
+= reloc_count
;
7294 /* MIPS may have a mix of REL and RELA relocs on sections.
7295 To support this curious ABI we keep reloc counts in
7296 elf_section_data too. We must be careful to add the
7297 relocations from the input section to the right output
7298 count. FIXME: Get rid of one count. We have
7299 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
7300 rel_count1
= &esdo
->rel_count
;
7303 bfd_boolean same_size
;
7304 bfd_size_type entsize1
;
7306 entsize1
= esdi
->rel_hdr
.sh_entsize
;
7307 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
7308 || entsize1
== bed
->s
->sizeof_rela
);
7309 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
7312 rel_count1
= &esdo
->rel_count2
;
7314 if (esdi
->rel_hdr2
!= NULL
)
7316 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
7317 unsigned int alt_count
;
7318 unsigned int *rel_count2
;
7320 BFD_ASSERT (entsize2
!= entsize1
7321 && (entsize2
== bed
->s
->sizeof_rel
7322 || entsize2
== bed
->s
->sizeof_rela
));
7324 rel_count2
= &esdo
->rel_count2
;
7326 rel_count2
= &esdo
->rel_count
;
7328 /* The following is probably too simplistic if the
7329 backend counts output relocs unusually. */
7330 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
7331 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
7332 *rel_count2
+= alt_count
;
7333 reloc_count
-= alt_count
;
7336 *rel_count1
+= reloc_count
;
7339 if (o
->reloc_count
> 0)
7340 o
->flags
|= SEC_RELOC
;
7343 /* Explicitly clear the SEC_RELOC flag. The linker tends to
7344 set it (this is probably a bug) and if it is set
7345 assign_section_numbers will create a reloc section. */
7346 o
->flags
&=~ SEC_RELOC
;
7349 /* If the SEC_ALLOC flag is not set, force the section VMA to
7350 zero. This is done in elf_fake_sections as well, but forcing
7351 the VMA to 0 here will ensure that relocs against these
7352 sections are handled correctly. */
7353 if ((o
->flags
& SEC_ALLOC
) == 0
7354 && ! o
->user_set_vma
)
7358 if (! info
->relocatable
&& merged
)
7359 elf_link_hash_traverse (elf_hash_table (info
),
7360 _bfd_elf_link_sec_merge_syms
, abfd
);
7362 /* Figure out the file positions for everything but the symbol table
7363 and the relocs. We set symcount to force assign_section_numbers
7364 to create a symbol table. */
7365 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
7366 BFD_ASSERT (! abfd
->output_has_begun
);
7367 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
7370 /* That created the reloc sections. Set their sizes, and assign
7371 them file positions, and allocate some buffers. */
7372 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7374 if ((o
->flags
& SEC_RELOC
) != 0)
7376 if (!(_bfd_elf_link_size_reloc_section
7377 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
7380 if (elf_section_data (o
)->rel_hdr2
7381 && !(_bfd_elf_link_size_reloc_section
7382 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
7386 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
7387 to count upwards while actually outputting the relocations. */
7388 elf_section_data (o
)->rel_count
= 0;
7389 elf_section_data (o
)->rel_count2
= 0;
7392 _bfd_elf_assign_file_positions_for_relocs (abfd
);
7394 /* We have now assigned file positions for all the sections except
7395 .symtab and .strtab. We start the .symtab section at the current
7396 file position, and write directly to it. We build the .strtab
7397 section in memory. */
7398 bfd_get_symcount (abfd
) = 0;
7399 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
7400 /* sh_name is set in prep_headers. */
7401 symtab_hdr
->sh_type
= SHT_SYMTAB
;
7402 /* sh_flags, sh_addr and sh_size all start off zero. */
7403 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
7404 /* sh_link is set in assign_section_numbers. */
7405 /* sh_info is set below. */
7406 /* sh_offset is set just below. */
7407 symtab_hdr
->sh_addralign
= 1 << bed
->s
->log_file_align
;
7409 off
= elf_tdata (abfd
)->next_file_pos
;
7410 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
7412 /* Note that at this point elf_tdata (abfd)->next_file_pos is
7413 incorrect. We do not yet know the size of the .symtab section.
7414 We correct next_file_pos below, after we do know the size. */
7416 /* Allocate a buffer to hold swapped out symbols. This is to avoid
7417 continuously seeking to the right position in the file. */
7418 if (! info
->keep_memory
|| max_sym_count
< 20)
7419 finfo
.symbuf_size
= 20;
7421 finfo
.symbuf_size
= max_sym_count
;
7422 amt
= finfo
.symbuf_size
;
7423 amt
*= bed
->s
->sizeof_sym
;
7424 finfo
.symbuf
= bfd_malloc (amt
);
7425 if (finfo
.symbuf
== NULL
)
7427 if (elf_numsections (abfd
) > SHN_LORESERVE
)
7429 /* Wild guess at number of output symbols. realloc'd as needed. */
7430 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
7431 finfo
.shndxbuf_size
= amt
;
7432 amt
*= sizeof (Elf_External_Sym_Shndx
);
7433 finfo
.symshndxbuf
= bfd_zmalloc (amt
);
7434 if (finfo
.symshndxbuf
== NULL
)
7438 /* Start writing out the symbol table. The first symbol is always a
7440 if (info
->strip
!= strip_all
7443 elfsym
.st_value
= 0;
7446 elfsym
.st_other
= 0;
7447 elfsym
.st_shndx
= SHN_UNDEF
;
7448 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
7454 /* Some standard ELF linkers do this, but we don't because it causes
7455 bootstrap comparison failures. */
7456 /* Output a file symbol for the output file as the second symbol.
7457 We output this even if we are discarding local symbols, although
7458 I'm not sure if this is correct. */
7459 elfsym
.st_value
= 0;
7461 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
7462 elfsym
.st_other
= 0;
7463 elfsym
.st_shndx
= SHN_ABS
;
7464 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
7465 &elfsym
, bfd_abs_section_ptr
, NULL
))
7469 /* Output a symbol for each section. We output these even if we are
7470 discarding local symbols, since they are used for relocs. These
7471 symbols have no names. We store the index of each one in the
7472 index field of the section, so that we can find it again when
7473 outputting relocs. */
7474 if (info
->strip
!= strip_all
7478 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7479 elfsym
.st_other
= 0;
7480 for (i
= 1; i
< elf_numsections (abfd
); i
++)
7482 o
= bfd_section_from_elf_index (abfd
, i
);
7484 o
->target_index
= bfd_get_symcount (abfd
);
7485 elfsym
.st_shndx
= i
;
7486 if (info
->relocatable
|| o
== NULL
)
7487 elfsym
.st_value
= 0;
7489 elfsym
.st_value
= o
->vma
;
7490 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
))
7492 if (i
== SHN_LORESERVE
- 1)
7493 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
7497 /* Allocate some memory to hold information read in from the input
7499 if (max_contents_size
!= 0)
7501 finfo
.contents
= bfd_malloc (max_contents_size
);
7502 if (finfo
.contents
== NULL
)
7506 if (max_external_reloc_size
!= 0)
7508 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
7509 if (finfo
.external_relocs
== NULL
)
7513 if (max_internal_reloc_count
!= 0)
7515 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7516 amt
*= sizeof (Elf_Internal_Rela
);
7517 finfo
.internal_relocs
= bfd_malloc (amt
);
7518 if (finfo
.internal_relocs
== NULL
)
7522 if (max_sym_count
!= 0)
7524 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
7525 finfo
.external_syms
= bfd_malloc (amt
);
7526 if (finfo
.external_syms
== NULL
)
7529 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
7530 finfo
.internal_syms
= bfd_malloc (amt
);
7531 if (finfo
.internal_syms
== NULL
)
7534 amt
= max_sym_count
* sizeof (long);
7535 finfo
.indices
= bfd_malloc (amt
);
7536 if (finfo
.indices
== NULL
)
7539 amt
= max_sym_count
* sizeof (asection
*);
7540 finfo
.sections
= bfd_malloc (amt
);
7541 if (finfo
.sections
== NULL
)
7545 if (max_sym_shndx_count
!= 0)
7547 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
7548 finfo
.locsym_shndx
= bfd_malloc (amt
);
7549 if (finfo
.locsym_shndx
== NULL
)
7553 if (elf_hash_table (info
)->tls_sec
)
7555 bfd_vma base
, end
= 0;
7558 for (sec
= elf_hash_table (info
)->tls_sec
;
7559 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
7562 bfd_vma size
= sec
->_raw_size
;
7564 if (size
== 0 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
7566 struct bfd_link_order
*o
;
7568 for (o
= sec
->link_order_head
; o
!= NULL
; o
= o
->next
)
7569 if (size
< o
->offset
+ o
->size
)
7570 size
= o
->offset
+ o
->size
;
7572 end
= sec
->vma
+ size
;
7574 base
= elf_hash_table (info
)->tls_sec
->vma
;
7575 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
7576 elf_hash_table (info
)->tls_size
= end
- base
;
7579 /* Since ELF permits relocations to be against local symbols, we
7580 must have the local symbols available when we do the relocations.
7581 Since we would rather only read the local symbols once, and we
7582 would rather not keep them in memory, we handle all the
7583 relocations for a single input file at the same time.
7585 Unfortunately, there is no way to know the total number of local
7586 symbols until we have seen all of them, and the local symbol
7587 indices precede the global symbol indices. This means that when
7588 we are generating relocatable output, and we see a reloc against
7589 a global symbol, we can not know the symbol index until we have
7590 finished examining all the local symbols to see which ones we are
7591 going to output. To deal with this, we keep the relocations in
7592 memory, and don't output them until the end of the link. This is
7593 an unfortunate waste of memory, but I don't see a good way around
7594 it. Fortunately, it only happens when performing a relocatable
7595 link, which is not the common case. FIXME: If keep_memory is set
7596 we could write the relocs out and then read them again; I don't
7597 know how bad the memory loss will be. */
7599 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7600 sub
->output_has_begun
= FALSE
;
7601 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7603 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7605 if (p
->type
== bfd_indirect_link_order
7606 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
7607 == bfd_target_elf_flavour
)
7608 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
7610 if (! sub
->output_has_begun
)
7612 if (! elf_link_input_bfd (&finfo
, sub
))
7614 sub
->output_has_begun
= TRUE
;
7617 else if (p
->type
== bfd_section_reloc_link_order
7618 || p
->type
== bfd_symbol_reloc_link_order
)
7620 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
7625 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
7631 /* Output any global symbols that got converted to local in a
7632 version script or due to symbol visibility. We do this in a
7633 separate step since ELF requires all local symbols to appear
7634 prior to any global symbols. FIXME: We should only do this if
7635 some global symbols were, in fact, converted to become local.
7636 FIXME: Will this work correctly with the Irix 5 linker? */
7637 eoinfo
.failed
= FALSE
;
7638 eoinfo
.finfo
= &finfo
;
7639 eoinfo
.localsyms
= TRUE
;
7640 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
7645 /* That wrote out all the local symbols. Finish up the symbol table
7646 with the global symbols. Even if we want to strip everything we
7647 can, we still need to deal with those global symbols that got
7648 converted to local in a version script. */
7650 /* The sh_info field records the index of the first non local symbol. */
7651 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
7654 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
7656 Elf_Internal_Sym sym
;
7657 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
7658 long last_local
= 0;
7660 /* Write out the section symbols for the output sections. */
7667 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7670 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
7676 dynindx
= elf_section_data (s
)->dynindx
;
7679 indx
= elf_section_data (s
)->this_idx
;
7680 BFD_ASSERT (indx
> 0);
7681 sym
.st_shndx
= indx
;
7682 sym
.st_value
= s
->vma
;
7683 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
7684 if (last_local
< dynindx
)
7685 last_local
= dynindx
;
7686 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
7690 /* Write out the local dynsyms. */
7691 if (elf_hash_table (info
)->dynlocal
)
7693 struct elf_link_local_dynamic_entry
*e
;
7694 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
7699 sym
.st_size
= e
->isym
.st_size
;
7700 sym
.st_other
= e
->isym
.st_other
;
7702 /* Copy the internal symbol as is.
7703 Note that we saved a word of storage and overwrote
7704 the original st_name with the dynstr_index. */
7707 if (e
->isym
.st_shndx
!= SHN_UNDEF
7708 && (e
->isym
.st_shndx
< SHN_LORESERVE
7709 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
7711 s
= bfd_section_from_elf_index (e
->input_bfd
,
7715 elf_section_data (s
->output_section
)->this_idx
;
7716 sym
.st_value
= (s
->output_section
->vma
7718 + e
->isym
.st_value
);
7721 if (last_local
< e
->dynindx
)
7722 last_local
= e
->dynindx
;
7724 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
7725 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
7729 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
7733 /* We get the global symbols from the hash table. */
7734 eoinfo
.failed
= FALSE
;
7735 eoinfo
.localsyms
= FALSE
;
7736 eoinfo
.finfo
= &finfo
;
7737 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
7742 /* If backend needs to output some symbols not present in the hash
7743 table, do it now. */
7744 if (bed
->elf_backend_output_arch_syms
)
7746 typedef bfd_boolean (*out_sym_func
)
7747 (void *, const char *, Elf_Internal_Sym
*, asection
*,
7748 struct elf_link_hash_entry
*);
7750 if (! ((*bed
->elf_backend_output_arch_syms
)
7751 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
7755 /* Flush all symbols to the file. */
7756 if (! elf_link_flush_output_syms (&finfo
, bed
))
7759 /* Now we know the size of the symtab section. */
7760 off
+= symtab_hdr
->sh_size
;
7762 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
7763 if (symtab_shndx_hdr
->sh_name
!= 0)
7765 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
7766 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
7767 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
7768 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
7769 symtab_shndx_hdr
->sh_size
= amt
;
7771 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
7774 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
7775 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
7780 /* Finish up and write out the symbol string table (.strtab)
7782 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
7783 /* sh_name was set in prep_headers. */
7784 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
7785 symstrtab_hdr
->sh_flags
= 0;
7786 symstrtab_hdr
->sh_addr
= 0;
7787 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
7788 symstrtab_hdr
->sh_entsize
= 0;
7789 symstrtab_hdr
->sh_link
= 0;
7790 symstrtab_hdr
->sh_info
= 0;
7791 /* sh_offset is set just below. */
7792 symstrtab_hdr
->sh_addralign
= 1;
7794 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
7795 elf_tdata (abfd
)->next_file_pos
= off
;
7797 if (bfd_get_symcount (abfd
) > 0)
7799 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
7800 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
7804 /* Adjust the relocs to have the correct symbol indices. */
7805 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7807 if ((o
->flags
& SEC_RELOC
) == 0)
7810 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
7811 elf_section_data (o
)->rel_count
,
7812 elf_section_data (o
)->rel_hashes
);
7813 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
7814 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
7815 elf_section_data (o
)->rel_count2
,
7816 (elf_section_data (o
)->rel_hashes
7817 + elf_section_data (o
)->rel_count
));
7819 /* Set the reloc_count field to 0 to prevent write_relocs from
7820 trying to swap the relocs out itself. */
7824 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
7825 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
7827 /* If we are linking against a dynamic object, or generating a
7828 shared library, finish up the dynamic linking information. */
7831 bfd_byte
*dyncon
, *dynconend
;
7833 /* Fix up .dynamic entries. */
7834 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
7835 BFD_ASSERT (o
!= NULL
);
7837 dyncon
= o
->contents
;
7838 dynconend
= o
->contents
+ o
->_raw_size
;
7839 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
7841 Elf_Internal_Dyn dyn
;
7845 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
7852 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
7854 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
7856 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
7857 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
7860 dyn
.d_un
.d_val
= relativecount
;
7867 name
= info
->init_function
;
7870 name
= info
->fini_function
;
7873 struct elf_link_hash_entry
*h
;
7875 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
7876 FALSE
, FALSE
, TRUE
);
7878 && (h
->root
.type
== bfd_link_hash_defined
7879 || h
->root
.type
== bfd_link_hash_defweak
))
7881 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
7882 o
= h
->root
.u
.def
.section
;
7883 if (o
->output_section
!= NULL
)
7884 dyn
.d_un
.d_val
+= (o
->output_section
->vma
7885 + o
->output_offset
);
7888 /* The symbol is imported from another shared
7889 library and does not apply to this one. */
7897 case DT_PREINIT_ARRAYSZ
:
7898 name
= ".preinit_array";
7900 case DT_INIT_ARRAYSZ
:
7901 name
= ".init_array";
7903 case DT_FINI_ARRAYSZ
:
7904 name
= ".fini_array";
7906 o
= bfd_get_section_by_name (abfd
, name
);
7909 (*_bfd_error_handler
)
7910 (_("%s: could not find output section %s"),
7911 bfd_get_filename (abfd
), name
);
7914 if (o
->_raw_size
== 0)
7915 (*_bfd_error_handler
)
7916 (_("warning: %s section has zero size"), name
);
7917 dyn
.d_un
.d_val
= o
->_raw_size
;
7920 case DT_PREINIT_ARRAY
:
7921 name
= ".preinit_array";
7924 name
= ".init_array";
7927 name
= ".fini_array";
7940 name
= ".gnu.version_d";
7943 name
= ".gnu.version_r";
7946 name
= ".gnu.version";
7948 o
= bfd_get_section_by_name (abfd
, name
);
7951 (*_bfd_error_handler
)
7952 (_("%s: could not find output section %s"),
7953 bfd_get_filename (abfd
), name
);
7956 dyn
.d_un
.d_ptr
= o
->vma
;
7963 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
7968 for (i
= 1; i
< elf_numsections (abfd
); i
++)
7970 Elf_Internal_Shdr
*hdr
;
7972 hdr
= elf_elfsections (abfd
)[i
];
7973 if (hdr
->sh_type
== type
7974 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
7976 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
7977 dyn
.d_un
.d_val
+= hdr
->sh_size
;
7980 if (dyn
.d_un
.d_val
== 0
7981 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
7982 dyn
.d_un
.d_val
= hdr
->sh_addr
;
7988 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
7992 /* If we have created any dynamic sections, then output them. */
7995 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
7998 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
8000 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
8001 || o
->_raw_size
== 0
8002 || o
->output_section
== bfd_abs_section_ptr
)
8004 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
8006 /* At this point, we are only interested in sections
8007 created by _bfd_elf_link_create_dynamic_sections. */
8010 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
8012 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
8014 if (! bfd_set_section_contents (abfd
, o
->output_section
,
8016 (file_ptr
) o
->output_offset
,
8022 /* The contents of the .dynstr section are actually in a
8024 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
8025 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
8026 || ! _bfd_elf_strtab_emit (abfd
,
8027 elf_hash_table (info
)->dynstr
))
8033 if (info
->relocatable
)
8035 bfd_boolean failed
= FALSE
;
8037 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
8042 /* If we have optimized stabs strings, output them. */
8043 if (elf_hash_table (info
)->stab_info
!= NULL
)
8045 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
8049 if (info
->eh_frame_hdr
)
8051 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
8055 if (finfo
.symstrtab
!= NULL
)
8056 _bfd_stringtab_free (finfo
.symstrtab
);
8057 if (finfo
.contents
!= NULL
)
8058 free (finfo
.contents
);
8059 if (finfo
.external_relocs
!= NULL
)
8060 free (finfo
.external_relocs
);
8061 if (finfo
.internal_relocs
!= NULL
)
8062 free (finfo
.internal_relocs
);
8063 if (finfo
.external_syms
!= NULL
)
8064 free (finfo
.external_syms
);
8065 if (finfo
.locsym_shndx
!= NULL
)
8066 free (finfo
.locsym_shndx
);
8067 if (finfo
.internal_syms
!= NULL
)
8068 free (finfo
.internal_syms
);
8069 if (finfo
.indices
!= NULL
)
8070 free (finfo
.indices
);
8071 if (finfo
.sections
!= NULL
)
8072 free (finfo
.sections
);
8073 if (finfo
.symbuf
!= NULL
)
8074 free (finfo
.symbuf
);
8075 if (finfo
.symshndxbuf
!= NULL
)
8076 free (finfo
.symshndxbuf
);
8077 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8079 if ((o
->flags
& SEC_RELOC
) != 0
8080 && elf_section_data (o
)->rel_hashes
!= NULL
)
8081 free (elf_section_data (o
)->rel_hashes
);
8084 elf_tdata (abfd
)->linker
= TRUE
;
8089 if (finfo
.symstrtab
!= NULL
)
8090 _bfd_stringtab_free (finfo
.symstrtab
);
8091 if (finfo
.contents
!= NULL
)
8092 free (finfo
.contents
);
8093 if (finfo
.external_relocs
!= NULL
)
8094 free (finfo
.external_relocs
);
8095 if (finfo
.internal_relocs
!= NULL
)
8096 free (finfo
.internal_relocs
);
8097 if (finfo
.external_syms
!= NULL
)
8098 free (finfo
.external_syms
);
8099 if (finfo
.locsym_shndx
!= NULL
)
8100 free (finfo
.locsym_shndx
);
8101 if (finfo
.internal_syms
!= NULL
)
8102 free (finfo
.internal_syms
);
8103 if (finfo
.indices
!= NULL
)
8104 free (finfo
.indices
);
8105 if (finfo
.sections
!= NULL
)
8106 free (finfo
.sections
);
8107 if (finfo
.symbuf
!= NULL
)
8108 free (finfo
.symbuf
);
8109 if (finfo
.symshndxbuf
!= NULL
)
8110 free (finfo
.symshndxbuf
);
8111 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8113 if ((o
->flags
& SEC_RELOC
) != 0
8114 && elf_section_data (o
)->rel_hashes
!= NULL
)
8115 free (elf_section_data (o
)->rel_hashes
);
8121 /* Garbage collect unused sections. */
8123 /* The mark phase of garbage collection. For a given section, mark
8124 it and any sections in this section's group, and all the sections
8125 which define symbols to which it refers. */
8127 typedef asection
* (*gc_mark_hook_fn
)
8128 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8129 struct elf_link_hash_entry
*, Elf_Internal_Sym
*);
8132 elf_gc_mark (struct bfd_link_info
*info
,
8134 gc_mark_hook_fn gc_mark_hook
)
8137 asection
*group_sec
;
8141 /* Mark all the sections in the group. */
8142 group_sec
= elf_section_data (sec
)->next_in_group
;
8143 if (group_sec
&& !group_sec
->gc_mark
)
8144 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
8147 /* Look through the section relocs. */
8149 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
8151 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
8152 Elf_Internal_Shdr
*symtab_hdr
;
8153 struct elf_link_hash_entry
**sym_hashes
;
8156 bfd
*input_bfd
= sec
->owner
;
8157 const struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
8158 Elf_Internal_Sym
*isym
= NULL
;
8161 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
8162 sym_hashes
= elf_sym_hashes (input_bfd
);
8164 /* Read the local symbols. */
8165 if (elf_bad_symtab (input_bfd
))
8167 nlocsyms
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8171 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
8173 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8174 if (isym
== NULL
&& nlocsyms
!= 0)
8176 isym
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, nlocsyms
, 0,
8182 /* Read the relocations. */
8183 relstart
= _bfd_elf_link_read_relocs (input_bfd
, sec
, NULL
, NULL
,
8185 if (relstart
== NULL
)
8190 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8192 if (bed
->s
->arch_size
== 32)
8197 for (rel
= relstart
; rel
< relend
; rel
++)
8199 unsigned long r_symndx
;
8201 struct elf_link_hash_entry
*h
;
8203 r_symndx
= rel
->r_info
>> r_sym_shift
;
8207 if (r_symndx
>= nlocsyms
8208 || ELF_ST_BIND (isym
[r_symndx
].st_info
) != STB_LOCAL
)
8210 h
= sym_hashes
[r_symndx
- extsymoff
];
8211 while (h
->root
.type
== bfd_link_hash_indirect
8212 || h
->root
.type
== bfd_link_hash_warning
)
8213 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8214 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, h
, NULL
);
8218 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, NULL
, &isym
[r_symndx
]);
8221 if (rsec
&& !rsec
->gc_mark
)
8223 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
8225 else if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
8234 if (elf_section_data (sec
)->relocs
!= relstart
)
8237 if (isym
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isym
)
8239 if (! info
->keep_memory
)
8242 symtab_hdr
->contents
= (unsigned char *) isym
;
8249 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
8252 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *idxptr
)
8256 if (h
->root
.type
== bfd_link_hash_warning
)
8257 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8259 if (h
->dynindx
!= -1
8260 && ((h
->root
.type
!= bfd_link_hash_defined
8261 && h
->root
.type
!= bfd_link_hash_defweak
)
8262 || h
->root
.u
.def
.section
->gc_mark
))
8263 h
->dynindx
= (*idx
)++;
8268 /* The sweep phase of garbage collection. Remove all garbage sections. */
8270 typedef bfd_boolean (*gc_sweep_hook_fn
)
8271 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
8274 elf_gc_sweep (struct bfd_link_info
*info
, gc_sweep_hook_fn gc_sweep_hook
)
8278 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8282 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8285 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8287 /* Keep special sections. Keep .debug sections. */
8288 if ((o
->flags
& SEC_LINKER_CREATED
)
8289 || (o
->flags
& SEC_DEBUGGING
))
8295 /* Skip sweeping sections already excluded. */
8296 if (o
->flags
& SEC_EXCLUDE
)
8299 /* Since this is early in the link process, it is simple
8300 to remove a section from the output. */
8301 o
->flags
|= SEC_EXCLUDE
;
8303 /* But we also have to update some of the relocation
8304 info we collected before. */
8306 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
8308 Elf_Internal_Rela
*internal_relocs
;
8312 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
8314 if (internal_relocs
== NULL
)
8317 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
8319 if (elf_section_data (o
)->relocs
!= internal_relocs
)
8320 free (internal_relocs
);
8328 /* Remove the symbols that were in the swept sections from the dynamic
8329 symbol table. GCFIXME: Anyone know how to get them out of the
8330 static symbol table as well? */
8334 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
, &i
);
8336 elf_hash_table (info
)->dynsymcount
= i
;
8342 /* Propagate collected vtable information. This is called through
8343 elf_link_hash_traverse. */
8346 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
8348 if (h
->root
.type
== bfd_link_hash_warning
)
8349 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8351 /* Those that are not vtables. */
8352 if (h
->vtable_parent
== NULL
)
8355 /* Those vtables that do not have parents, we cannot merge. */
8356 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
8359 /* If we've already been done, exit. */
8360 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
8363 /* Make sure the parent's table is up to date. */
8364 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
8366 if (h
->vtable_entries_used
== NULL
)
8368 /* None of this table's entries were referenced. Re-use the
8370 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
8371 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
8376 bfd_boolean
*cu
, *pu
;
8378 /* Or the parent's entries into ours. */
8379 cu
= h
->vtable_entries_used
;
8381 pu
= h
->vtable_parent
->vtable_entries_used
;
8384 const struct elf_backend_data
*bed
;
8385 unsigned int log_file_align
;
8387 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
8388 log_file_align
= bed
->s
->log_file_align
;
8389 n
= h
->vtable_parent
->vtable_entries_size
>> log_file_align
;
8404 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
8407 bfd_vma hstart
, hend
;
8408 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
8409 const struct elf_backend_data
*bed
;
8410 unsigned int log_file_align
;
8412 if (h
->root
.type
== bfd_link_hash_warning
)
8413 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8415 /* Take care of both those symbols that do not describe vtables as
8416 well as those that are not loaded. */
8417 if (h
->vtable_parent
== NULL
)
8420 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
8421 || h
->root
.type
== bfd_link_hash_defweak
);
8423 sec
= h
->root
.u
.def
.section
;
8424 hstart
= h
->root
.u
.def
.value
;
8425 hend
= hstart
+ h
->size
;
8427 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
8429 return *(bfd_boolean
*) okp
= FALSE
;
8430 bed
= get_elf_backend_data (sec
->owner
);
8431 log_file_align
= bed
->s
->log_file_align
;
8433 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8435 for (rel
= relstart
; rel
< relend
; ++rel
)
8436 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
8438 /* If the entry is in use, do nothing. */
8439 if (h
->vtable_entries_used
8440 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
8442 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
8443 if (h
->vtable_entries_used
[entry
])
8446 /* Otherwise, kill it. */
8447 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
8453 /* Mark sections containing dynamically referenced symbols. This is called
8454 through elf_link_hash_traverse. */
8457 elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
,
8458 void *okp ATTRIBUTE_UNUSED
)
8460 if (h
->root
.type
== bfd_link_hash_warning
)
8461 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8463 if ((h
->root
.type
== bfd_link_hash_defined
8464 || h
->root
.type
== bfd_link_hash_defweak
)
8465 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
))
8466 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
8471 /* Do mark and sweep of unused sections. */
8474 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
8476 bfd_boolean ok
= TRUE
;
8478 asection
* (*gc_mark_hook
)
8479 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8480 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*);
8482 if (!get_elf_backend_data (abfd
)->can_gc_sections
8483 || info
->relocatable
8484 || info
->emitrelocations
8486 || !is_elf_hash_table (info
->hash
))
8488 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
8492 /* Apply transitive closure to the vtable entry usage info. */
8493 elf_link_hash_traverse (elf_hash_table (info
),
8494 elf_gc_propagate_vtable_entries_used
,
8499 /* Kill the vtable relocations that were not used. */
8500 elf_link_hash_traverse (elf_hash_table (info
),
8501 elf_gc_smash_unused_vtentry_relocs
,
8506 /* Mark dynamically referenced symbols. */
8507 if (elf_hash_table (info
)->dynamic_sections_created
)
8508 elf_link_hash_traverse (elf_hash_table (info
),
8509 elf_gc_mark_dynamic_ref_symbol
,
8514 /* Grovel through relocs to find out who stays ... */
8515 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
8516 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8520 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8523 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8525 if (o
->flags
& SEC_KEEP
)
8527 /* _bfd_elf_discard_section_eh_frame knows how to discard
8528 orphaned FDEs so don't mark sections referenced by the
8529 EH frame section. */
8530 if (strcmp (o
->name
, ".eh_frame") == 0)
8532 else if (!elf_gc_mark (info
, o
, gc_mark_hook
))
8538 /* ... and mark SEC_EXCLUDE for those that go. */
8539 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
8545 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
8548 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
8550 struct elf_link_hash_entry
*h
,
8553 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
8554 struct elf_link_hash_entry
**search
, *child
;
8555 bfd_size_type extsymcount
;
8556 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8558 /* The sh_info field of the symtab header tells us where the
8559 external symbols start. We don't care about the local symbols at
8561 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
8562 if (!elf_bad_symtab (abfd
))
8563 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
8565 sym_hashes
= elf_sym_hashes (abfd
);
8566 sym_hashes_end
= sym_hashes
+ extsymcount
;
8568 /* Hunt down the child symbol, which is in this section at the same
8569 offset as the relocation. */
8570 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
8572 if ((child
= *search
) != NULL
8573 && (child
->root
.type
== bfd_link_hash_defined
8574 || child
->root
.type
== bfd_link_hash_defweak
)
8575 && child
->root
.u
.def
.section
== sec
8576 && child
->root
.u
.def
.value
== offset
)
8580 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
8581 bfd_archive_filename (abfd
), sec
->name
,
8582 (unsigned long) offset
);
8583 bfd_set_error (bfd_error_invalid_operation
);
8589 /* This *should* only be the absolute section. It could potentially
8590 be that someone has defined a non-global vtable though, which
8591 would be bad. It isn't worth paging in the local symbols to be
8592 sure though; that case should simply be handled by the assembler. */
8594 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
8597 child
->vtable_parent
= h
;
8602 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
8605 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
8606 asection
*sec ATTRIBUTE_UNUSED
,
8607 struct elf_link_hash_entry
*h
,
8610 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8611 unsigned int log_file_align
= bed
->s
->log_file_align
;
8613 if (addend
>= h
->vtable_entries_size
)
8615 size_t size
, bytes
, file_align
;
8616 bfd_boolean
*ptr
= h
->vtable_entries_used
;
8618 /* While the symbol is undefined, we have to be prepared to handle
8620 file_align
= 1 << log_file_align
;
8621 if (h
->root
.type
== bfd_link_hash_undefined
)
8622 size
= addend
+ file_align
;
8628 /* Oops! We've got a reference past the defined end of
8629 the table. This is probably a bug -- shall we warn? */
8630 size
= addend
+ file_align
;
8633 size
= (size
+ file_align
- 1) & -file_align
;
8635 /* Allocate one extra entry for use as a "done" flag for the
8636 consolidation pass. */
8637 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
8641 ptr
= bfd_realloc (ptr
- 1, bytes
);
8647 oldbytes
= (((h
->vtable_entries_size
>> log_file_align
) + 1)
8648 * sizeof (bfd_boolean
));
8649 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
8653 ptr
= bfd_zmalloc (bytes
);
8658 /* And arrange for that done flag to be at index -1. */
8659 h
->vtable_entries_used
= ptr
+ 1;
8660 h
->vtable_entries_size
= size
;
8663 h
->vtable_entries_used
[addend
>> log_file_align
] = TRUE
;
8668 struct alloc_got_off_arg
{
8670 unsigned int got_elt_size
;
8673 /* We need a special top-level link routine to convert got reference counts
8674 to real got offsets. */
8677 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
8679 struct alloc_got_off_arg
*gofarg
= arg
;
8681 if (h
->root
.type
== bfd_link_hash_warning
)
8682 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8684 if (h
->got
.refcount
> 0)
8686 h
->got
.offset
= gofarg
->gotoff
;
8687 gofarg
->gotoff
+= gofarg
->got_elt_size
;
8690 h
->got
.offset
= (bfd_vma
) -1;
8695 /* And an accompanying bit to work out final got entry offsets once
8696 we're done. Should be called from final_link. */
8699 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
8700 struct bfd_link_info
*info
)
8703 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8705 unsigned int got_elt_size
= bed
->s
->arch_size
/ 8;
8706 struct alloc_got_off_arg gofarg
;
8708 if (! is_elf_hash_table (info
->hash
))
8711 /* The GOT offset is relative to the .got section, but the GOT header is
8712 put into the .got.plt section, if the backend uses it. */
8713 if (bed
->want_got_plt
)
8716 gotoff
= bed
->got_header_size
;
8718 /* Do the local .got entries first. */
8719 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
8721 bfd_signed_vma
*local_got
;
8722 bfd_size_type j
, locsymcount
;
8723 Elf_Internal_Shdr
*symtab_hdr
;
8725 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
8728 local_got
= elf_local_got_refcounts (i
);
8732 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
8733 if (elf_bad_symtab (i
))
8734 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8736 locsymcount
= symtab_hdr
->sh_info
;
8738 for (j
= 0; j
< locsymcount
; ++j
)
8740 if (local_got
[j
] > 0)
8742 local_got
[j
] = gotoff
;
8743 gotoff
+= got_elt_size
;
8746 local_got
[j
] = (bfd_vma
) -1;
8750 /* Then the global .got entries. .plt refcounts are handled by
8751 adjust_dynamic_symbol */
8752 gofarg
.gotoff
= gotoff
;
8753 gofarg
.got_elt_size
= got_elt_size
;
8754 elf_link_hash_traverse (elf_hash_table (info
),
8755 elf_gc_allocate_got_offsets
,
8760 /* Many folk need no more in the way of final link than this, once
8761 got entry reference counting is enabled. */
8764 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
8766 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
8769 /* Invoke the regular ELF backend linker to do all the work. */
8770 return bfd_elf_final_link (abfd
, info
);
8774 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
8776 struct elf_reloc_cookie
*rcookie
= cookie
;
8778 if (rcookie
->bad_symtab
)
8779 rcookie
->rel
= rcookie
->rels
;
8781 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8783 unsigned long r_symndx
;
8785 if (! rcookie
->bad_symtab
)
8786 if (rcookie
->rel
->r_offset
> offset
)
8788 if (rcookie
->rel
->r_offset
!= offset
)
8791 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
8792 if (r_symndx
== SHN_UNDEF
)
8795 if (r_symndx
>= rcookie
->locsymcount
8796 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
8798 struct elf_link_hash_entry
*h
;
8800 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8802 while (h
->root
.type
== bfd_link_hash_indirect
8803 || h
->root
.type
== bfd_link_hash_warning
)
8804 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8806 if ((h
->root
.type
== bfd_link_hash_defined
8807 || h
->root
.type
== bfd_link_hash_defweak
)
8808 && elf_discarded_section (h
->root
.u
.def
.section
))
8815 /* It's not a relocation against a global symbol,
8816 but it could be a relocation against a local
8817 symbol for a discarded section. */
8819 Elf_Internal_Sym
*isym
;
8821 /* Need to: get the symbol; get the section. */
8822 isym
= &rcookie
->locsyms
[r_symndx
];
8823 if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
8825 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
8826 if (isec
!= NULL
&& elf_discarded_section (isec
))
8835 /* Discard unneeded references to discarded sections.
8836 Returns TRUE if any section's size was changed. */
8837 /* This function assumes that the relocations are in sorted order,
8838 which is true for all known assemblers. */
8841 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
8843 struct elf_reloc_cookie cookie
;
8844 asection
*stab
, *eh
;
8845 Elf_Internal_Shdr
*symtab_hdr
;
8846 const struct elf_backend_data
*bed
;
8849 bfd_boolean ret
= FALSE
;
8851 if (info
->traditional_format
8852 || !is_elf_hash_table (info
->hash
))
8855 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8857 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8860 bed
= get_elf_backend_data (abfd
);
8862 if ((abfd
->flags
& DYNAMIC
) != 0)
8865 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8866 if (info
->relocatable
8868 && (eh
->_raw_size
== 0
8869 || bfd_is_abs_section (eh
->output_section
))))
8872 stab
= bfd_get_section_by_name (abfd
, ".stab");
8874 && (stab
->_raw_size
== 0
8875 || bfd_is_abs_section (stab
->output_section
)
8876 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
8881 && bed
->elf_backend_discard_info
== NULL
)
8884 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8886 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
8887 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
8888 if (cookie
.bad_symtab
)
8890 cookie
.locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8891 cookie
.extsymoff
= 0;
8895 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8896 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8899 if (bed
->s
->arch_size
== 32)
8900 cookie
.r_sym_shift
= 8;
8902 cookie
.r_sym_shift
= 32;
8904 cookie
.locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8905 if (cookie
.locsyms
== NULL
&& cookie
.locsymcount
!= 0)
8907 cookie
.locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
8908 cookie
.locsymcount
, 0,
8910 if (cookie
.locsyms
== NULL
)
8917 count
= stab
->reloc_count
;
8919 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, stab
, NULL
, NULL
,
8921 if (cookie
.rels
!= NULL
)
8923 cookie
.rel
= cookie
.rels
;
8924 cookie
.relend
= cookie
.rels
;
8925 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
8926 if (_bfd_discard_section_stabs (abfd
, stab
,
8927 elf_section_data (stab
)->sec_info
,
8928 bfd_elf_reloc_symbol_deleted_p
,
8931 if (elf_section_data (stab
)->relocs
!= cookie
.rels
)
8939 count
= eh
->reloc_count
;
8941 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, eh
, NULL
, NULL
,
8943 cookie
.rel
= cookie
.rels
;
8944 cookie
.relend
= cookie
.rels
;
8945 if (cookie
.rels
!= NULL
)
8946 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
8948 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
8949 bfd_elf_reloc_symbol_deleted_p
,
8953 if (cookie
.rels
!= NULL
8954 && elf_section_data (eh
)->relocs
!= cookie
.rels
)
8958 if (bed
->elf_backend_discard_info
!= NULL
8959 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
8962 if (cookie
.locsyms
!= NULL
8963 && symtab_hdr
->contents
!= (unsigned char *) cookie
.locsyms
)
8965 if (! info
->keep_memory
)
8966 free (cookie
.locsyms
);
8968 symtab_hdr
->contents
= (unsigned char *) cookie
.locsyms
;
8972 if (info
->eh_frame_hdr
8973 && !info
->relocatable
8974 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))