1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
35 struct elf_link_hash_entry
*h
;
36 struct bfd_link_hash_entry
*bh
;
37 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
40 /* This function may be called more than once. */
41 s
= bfd_get_section_by_name (abfd
, ".got");
42 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
45 switch (bed
->s
->arch_size
)
56 bfd_set_error (bfd_error_bad_value
);
60 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
61 | SEC_LINKER_CREATED
);
63 s
= bfd_make_section (abfd
, ".got");
65 || !bfd_set_section_flags (abfd
, s
, flags
)
66 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
69 if (bed
->want_got_plt
)
71 s
= bfd_make_section (abfd
, ".got.plt");
73 || !bfd_set_section_flags (abfd
, s
, flags
)
74 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
78 if (bed
->want_got_sym
)
80 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
81 (or .got.plt) section. We don't do this in the linker script
82 because we don't want to define the symbol if we are not creating
83 a global offset table. */
85 if (!(_bfd_generic_link_add_one_symbol
86 (info
, abfd
, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL
, s
,
87 bed
->got_symbol_offset
, NULL
, FALSE
, bed
->collect
, &bh
)))
89 h
= (struct elf_link_hash_entry
*) bh
;
90 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
93 if (! info
->executable
94 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
97 elf_hash_table (info
)->hgot
= h
;
100 /* The first bit of the global offset table is the header. */
101 s
->size
+= bed
->got_header_size
+ bed
->got_symbol_offset
;
106 /* Create some sections which will be filled in with dynamic linking
107 information. ABFD is an input file which requires dynamic sections
108 to be created. The dynamic sections take up virtual memory space
109 when the final executable is run, so we need to create them before
110 addresses are assigned to the output sections. We work out the
111 actual contents and size of these sections later. */
114 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
117 register asection
*s
;
118 struct elf_link_hash_entry
*h
;
119 struct bfd_link_hash_entry
*bh
;
120 const struct elf_backend_data
*bed
;
122 if (! is_elf_hash_table (info
->hash
))
125 if (elf_hash_table (info
)->dynamic_sections_created
)
128 /* Make sure that all dynamic sections use the same input BFD. */
129 if (elf_hash_table (info
)->dynobj
== NULL
)
130 elf_hash_table (info
)->dynobj
= abfd
;
132 abfd
= elf_hash_table (info
)->dynobj
;
134 /* Note that we set the SEC_IN_MEMORY flag for all of these
136 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
137 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
139 /* A dynamically linked executable has a .interp section, but a
140 shared library does not. */
141 if (info
->executable
)
143 s
= bfd_make_section (abfd
, ".interp");
145 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
149 if (! info
->traditional_format
)
151 s
= bfd_make_section (abfd
, ".eh_frame_hdr");
153 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
154 || ! bfd_set_section_alignment (abfd
, s
, 2))
156 elf_hash_table (info
)->eh_info
.hdr_sec
= s
;
159 bed
= get_elf_backend_data (abfd
);
161 /* Create sections to hold version informations. These are removed
162 if they are not needed. */
163 s
= bfd_make_section (abfd
, ".gnu.version_d");
165 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
166 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
169 s
= bfd_make_section (abfd
, ".gnu.version");
171 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
172 || ! bfd_set_section_alignment (abfd
, s
, 1))
175 s
= bfd_make_section (abfd
, ".gnu.version_r");
177 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
178 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
181 s
= bfd_make_section (abfd
, ".dynsym");
183 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
184 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
187 s
= bfd_make_section (abfd
, ".dynstr");
189 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
192 /* Create a strtab to hold the dynamic symbol names. */
193 if (elf_hash_table (info
)->dynstr
== NULL
)
195 elf_hash_table (info
)->dynstr
= _bfd_elf_strtab_init ();
196 if (elf_hash_table (info
)->dynstr
== NULL
)
200 s
= bfd_make_section (abfd
, ".dynamic");
202 || ! bfd_set_section_flags (abfd
, s
, flags
)
203 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
206 /* The special symbol _DYNAMIC is always set to the start of the
207 .dynamic section. This call occurs before we have processed the
208 symbols for any dynamic object, so we don't have to worry about
209 overriding a dynamic definition. We could set _DYNAMIC in a
210 linker script, but we only want to define it if we are, in fact,
211 creating a .dynamic section. We don't want to define it if there
212 is no .dynamic section, since on some ELF platforms the start up
213 code examines it to decide how to initialize the process. */
215 if (! (_bfd_generic_link_add_one_symbol
216 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, 0, NULL
, FALSE
,
217 get_elf_backend_data (abfd
)->collect
, &bh
)))
219 h
= (struct elf_link_hash_entry
*) bh
;
220 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
221 h
->type
= STT_OBJECT
;
223 if (! info
->executable
224 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
227 s
= bfd_make_section (abfd
, ".hash");
229 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
230 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
232 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
234 /* Let the backend create the rest of the sections. This lets the
235 backend set the right flags. The backend will normally create
236 the .got and .plt sections. */
237 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
240 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
245 /* Create dynamic sections when linking against a dynamic object. */
248 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
250 flagword flags
, pltflags
;
252 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
254 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
255 .rel[a].bss sections. */
257 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
258 | SEC_LINKER_CREATED
);
261 pltflags
|= SEC_CODE
;
262 if (bed
->plt_not_loaded
)
263 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
264 if (bed
->plt_readonly
)
265 pltflags
|= SEC_READONLY
;
267 s
= bfd_make_section (abfd
, ".plt");
269 || ! bfd_set_section_flags (abfd
, s
, pltflags
)
270 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
273 if (bed
->want_plt_sym
)
275 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
277 struct elf_link_hash_entry
*h
;
278 struct bfd_link_hash_entry
*bh
= NULL
;
280 if (! (_bfd_generic_link_add_one_symbol
281 (info
, abfd
, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL
, s
, 0, NULL
,
282 FALSE
, get_elf_backend_data (abfd
)->collect
, &bh
)))
284 h
= (struct elf_link_hash_entry
*) bh
;
285 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
286 h
->type
= STT_OBJECT
;
288 if (! info
->executable
289 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
293 s
= bfd_make_section (abfd
,
294 bed
->default_use_rela_p
? ".rela.plt" : ".rel.plt");
296 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
297 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
300 if (! _bfd_elf_create_got_section (abfd
, info
))
303 if (bed
->want_dynbss
)
305 /* The .dynbss section is a place to put symbols which are defined
306 by dynamic objects, are referenced by regular objects, and are
307 not functions. We must allocate space for them in the process
308 image and use a R_*_COPY reloc to tell the dynamic linker to
309 initialize them at run time. The linker script puts the .dynbss
310 section into the .bss section of the final image. */
311 s
= bfd_make_section (abfd
, ".dynbss");
313 || ! bfd_set_section_flags (abfd
, s
, SEC_ALLOC
| SEC_LINKER_CREATED
))
316 /* The .rel[a].bss section holds copy relocs. This section is not
317 normally needed. We need to create it here, though, so that the
318 linker will map it to an output section. We can't just create it
319 only if we need it, because we will not know whether we need it
320 until we have seen all the input files, and the first time the
321 main linker code calls BFD after examining all the input files
322 (size_dynamic_sections) the input sections have already been
323 mapped to the output sections. If the section turns out not to
324 be needed, we can discard it later. We will never need this
325 section when generating a shared object, since they do not use
329 s
= bfd_make_section (abfd
,
330 (bed
->default_use_rela_p
331 ? ".rela.bss" : ".rel.bss"));
333 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
334 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
342 /* Record a new dynamic symbol. We record the dynamic symbols as we
343 read the input files, since we need to have a list of all of them
344 before we can determine the final sizes of the output sections.
345 Note that we may actually call this function even though we are not
346 going to output any dynamic symbols; in some cases we know that a
347 symbol should be in the dynamic symbol table, but only if there is
351 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
352 struct elf_link_hash_entry
*h
)
354 if (h
->dynindx
== -1)
356 struct elf_strtab_hash
*dynstr
;
361 /* XXX: The ABI draft says the linker must turn hidden and
362 internal symbols into STB_LOCAL symbols when producing the
363 DSO. However, if ld.so honors st_other in the dynamic table,
364 this would not be necessary. */
365 switch (ELF_ST_VISIBILITY (h
->other
))
369 if (h
->root
.type
!= bfd_link_hash_undefined
370 && h
->root
.type
!= bfd_link_hash_undefweak
)
372 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
380 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
381 ++elf_hash_table (info
)->dynsymcount
;
383 dynstr
= elf_hash_table (info
)->dynstr
;
386 /* Create a strtab to hold the dynamic symbol names. */
387 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
392 /* We don't put any version information in the dynamic string
394 name
= h
->root
.root
.string
;
395 p
= strchr (name
, ELF_VER_CHR
);
397 /* We know that the p points into writable memory. In fact,
398 there are only a few symbols that have read-only names, being
399 those like _GLOBAL_OFFSET_TABLE_ that are created specially
400 by the backends. Most symbols will have names pointing into
401 an ELF string table read from a file, or to objalloc memory. */
404 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
409 if (indx
== (bfd_size_type
) -1)
411 h
->dynstr_index
= indx
;
417 /* Record an assignment to a symbol made by a linker script. We need
418 this in case some dynamic object refers to this symbol. */
421 bfd_elf_record_link_assignment (bfd
*output_bfd ATTRIBUTE_UNUSED
,
422 struct bfd_link_info
*info
,
426 struct elf_link_hash_entry
*h
;
428 if (!is_elf_hash_table (info
->hash
))
431 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, TRUE
, FALSE
);
435 /* Since we're defining the symbol, don't let it seem to have not
436 been defined. record_dynamic_symbol and size_dynamic_sections
437 may depend on this. */
438 if (h
->root
.type
== bfd_link_hash_undefweak
439 || h
->root
.type
== bfd_link_hash_undefined
)
440 h
->root
.type
= bfd_link_hash_new
;
442 if (h
->root
.type
== bfd_link_hash_new
)
443 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_ELF
;
445 /* If this symbol is being provided by the linker script, and it is
446 currently defined by a dynamic object, but not by a regular
447 object, then mark it as undefined so that the generic linker will
448 force the correct value. */
450 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
451 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
452 h
->root
.type
= bfd_link_hash_undefined
;
454 /* If this symbol is not being provided by the linker script, and it is
455 currently defined by a dynamic object, but not by a regular object,
456 then clear out any version information because the symbol will not be
457 associated with the dynamic object any more. */
459 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
460 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
461 h
->verinfo
.verdef
= NULL
;
463 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
465 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
466 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
470 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
473 /* If this is a weak defined symbol, and we know a corresponding
474 real symbol from the same dynamic object, make sure the real
475 symbol is also made into a dynamic symbol. */
476 if (h
->weakdef
!= NULL
477 && h
->weakdef
->dynindx
== -1)
479 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
487 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
488 success, and 2 on a failure caused by attempting to record a symbol
489 in a discarded section, eg. a discarded link-once section symbol. */
492 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
497 struct elf_link_local_dynamic_entry
*entry
;
498 struct elf_link_hash_table
*eht
;
499 struct elf_strtab_hash
*dynstr
;
500 unsigned long dynstr_index
;
502 Elf_External_Sym_Shndx eshndx
;
503 char esym
[sizeof (Elf64_External_Sym
)];
505 if (! is_elf_hash_table (info
->hash
))
508 /* See if the entry exists already. */
509 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
510 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
513 amt
= sizeof (*entry
);
514 entry
= bfd_alloc (input_bfd
, amt
);
518 /* Go find the symbol, so that we can find it's name. */
519 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
520 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
522 bfd_release (input_bfd
, entry
);
526 if (entry
->isym
.st_shndx
!= SHN_UNDEF
527 && (entry
->isym
.st_shndx
< SHN_LORESERVE
528 || entry
->isym
.st_shndx
> SHN_HIRESERVE
))
532 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
533 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
535 /* We can still bfd_release here as nothing has done another
536 bfd_alloc. We can't do this later in this function. */
537 bfd_release (input_bfd
, entry
);
542 name
= (bfd_elf_string_from_elf_section
543 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
544 entry
->isym
.st_name
));
546 dynstr
= elf_hash_table (info
)->dynstr
;
549 /* Create a strtab to hold the dynamic symbol names. */
550 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
555 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
556 if (dynstr_index
== (unsigned long) -1)
558 entry
->isym
.st_name
= dynstr_index
;
560 eht
= elf_hash_table (info
);
562 entry
->next
= eht
->dynlocal
;
563 eht
->dynlocal
= entry
;
564 entry
->input_bfd
= input_bfd
;
565 entry
->input_indx
= input_indx
;
568 /* Whatever binding the symbol had before, it's now local. */
570 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
572 /* The dynindx will be set at the end of size_dynamic_sections. */
577 /* Return the dynindex of a local dynamic symbol. */
580 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
584 struct elf_link_local_dynamic_entry
*e
;
586 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
587 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
592 /* This function is used to renumber the dynamic symbols, if some of
593 them are removed because they are marked as local. This is called
594 via elf_link_hash_traverse. */
597 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
600 size_t *count
= data
;
602 if (h
->root
.type
== bfd_link_hash_warning
)
603 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
605 if (h
->dynindx
!= -1)
606 h
->dynindx
= ++(*count
);
611 /* Return true if the dynamic symbol for a given section should be
612 omitted when creating a shared library. */
614 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
615 struct bfd_link_info
*info
,
618 switch (elf_section_data (p
)->this_hdr
.sh_type
)
622 /* If sh_type is yet undecided, assume it could be
623 SHT_PROGBITS/SHT_NOBITS. */
625 if (strcmp (p
->name
, ".got") == 0
626 || strcmp (p
->name
, ".got.plt") == 0
627 || strcmp (p
->name
, ".plt") == 0)
630 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
633 && (ip
= bfd_get_section_by_name (dynobj
, p
->name
))
635 && (ip
->flags
& SEC_LINKER_CREATED
)
636 && ip
->output_section
== p
)
641 /* There shouldn't be section relative relocations
642 against any other section. */
648 /* Assign dynsym indices. In a shared library we generate a section
649 symbol for each output section, which come first. Next come all of
650 the back-end allocated local dynamic syms, followed by the rest of
651 the global symbols. */
654 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
, struct bfd_link_info
*info
)
656 unsigned long dynsymcount
= 0;
660 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
662 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
663 if ((p
->flags
& SEC_EXCLUDE
) == 0
664 && (p
->flags
& SEC_ALLOC
) != 0
665 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
666 elf_section_data (p
)->dynindx
= ++dynsymcount
;
669 if (elf_hash_table (info
)->dynlocal
)
671 struct elf_link_local_dynamic_entry
*p
;
672 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
673 p
->dynindx
= ++dynsymcount
;
676 elf_link_hash_traverse (elf_hash_table (info
),
677 elf_link_renumber_hash_table_dynsyms
,
680 /* There is an unused NULL entry at the head of the table which
681 we must account for in our count. Unless there weren't any
682 symbols, which means we'll have no table at all. */
683 if (dynsymcount
!= 0)
686 return elf_hash_table (info
)->dynsymcount
= dynsymcount
;
689 /* This function is called when we want to define a new symbol. It
690 handles the various cases which arise when we find a definition in
691 a dynamic object, or when there is already a definition in a
692 dynamic object. The new symbol is described by NAME, SYM, PSEC,
693 and PVALUE. We set SYM_HASH to the hash table entry. We set
694 OVERRIDE if the old symbol is overriding a new definition. We set
695 TYPE_CHANGE_OK if it is OK for the type to change. We set
696 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
697 change, we mean that we shouldn't warn if the type or size does
701 _bfd_elf_merge_symbol (bfd
*abfd
,
702 struct bfd_link_info
*info
,
704 Elf_Internal_Sym
*sym
,
707 struct elf_link_hash_entry
**sym_hash
,
709 bfd_boolean
*override
,
710 bfd_boolean
*type_change_ok
,
711 bfd_boolean
*size_change_ok
)
714 struct elf_link_hash_entry
*h
;
715 struct elf_link_hash_entry
*flip
;
718 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
719 bfd_boolean newweak
, oldweak
;
725 bind
= ELF_ST_BIND (sym
->st_info
);
727 if (! bfd_is_und_section (sec
))
728 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
730 h
= ((struct elf_link_hash_entry
*)
731 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
736 /* This code is for coping with dynamic objects, and is only useful
737 if we are doing an ELF link. */
738 if (info
->hash
->creator
!= abfd
->xvec
)
741 /* For merging, we only care about real symbols. */
743 while (h
->root
.type
== bfd_link_hash_indirect
744 || h
->root
.type
== bfd_link_hash_warning
)
745 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
747 /* If we just created the symbol, mark it as being an ELF symbol.
748 Other than that, there is nothing to do--there is no merge issue
749 with a newly defined symbol--so we just return. */
751 if (h
->root
.type
== bfd_link_hash_new
)
753 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
757 /* OLDBFD is a BFD associated with the existing symbol. */
759 switch (h
->root
.type
)
765 case bfd_link_hash_undefined
:
766 case bfd_link_hash_undefweak
:
767 oldbfd
= h
->root
.u
.undef
.abfd
;
770 case bfd_link_hash_defined
:
771 case bfd_link_hash_defweak
:
772 oldbfd
= h
->root
.u
.def
.section
->owner
;
775 case bfd_link_hash_common
:
776 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
780 /* In cases involving weak versioned symbols, we may wind up trying
781 to merge a symbol with itself. Catch that here, to avoid the
782 confusion that results if we try to override a symbol with
783 itself. The additional tests catch cases like
784 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
785 dynamic object, which we do want to handle here. */
787 && ((abfd
->flags
& DYNAMIC
) == 0
788 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
791 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
792 respectively, is from a dynamic object. */
794 if ((abfd
->flags
& DYNAMIC
) != 0)
800 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
805 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
806 indices used by MIPS ELF. */
807 switch (h
->root
.type
)
813 case bfd_link_hash_defined
:
814 case bfd_link_hash_defweak
:
815 hsec
= h
->root
.u
.def
.section
;
818 case bfd_link_hash_common
:
819 hsec
= h
->root
.u
.c
.p
->section
;
826 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
829 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
830 respectively, appear to be a definition rather than reference. */
832 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
837 if (h
->root
.type
== bfd_link_hash_undefined
838 || h
->root
.type
== bfd_link_hash_undefweak
839 || h
->root
.type
== bfd_link_hash_common
)
844 /* We need to remember if a symbol has a definition in a dynamic
845 object or is weak in all dynamic objects. Internal and hidden
846 visibility will make it unavailable to dynamic objects. */
847 if (newdyn
&& (h
->elf_link_hash_flags
& ELF_LINK_DYNAMIC_DEF
) == 0)
849 if (!bfd_is_und_section (sec
))
850 h
->elf_link_hash_flags
|= ELF_LINK_DYNAMIC_DEF
;
853 /* Check if this symbol is weak in all dynamic objects. If it
854 is the first time we see it in a dynamic object, we mark
855 if it is weak. Otherwise, we clear it. */
856 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) == 0)
858 if (bind
== STB_WEAK
)
859 h
->elf_link_hash_flags
|= ELF_LINK_DYNAMIC_WEAK
;
861 else if (bind
!= STB_WEAK
)
862 h
->elf_link_hash_flags
&= ~ELF_LINK_DYNAMIC_WEAK
;
866 /* If the old symbol has non-default visibility, we ignore the new
867 definition from a dynamic object. */
869 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
870 && !bfd_is_und_section (sec
))
873 /* Make sure this symbol is dynamic. */
874 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
875 /* A protected symbol has external availability. Make sure it is
878 FIXME: Should we check type and size for protected symbol? */
879 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
880 return bfd_elf_link_record_dynamic_symbol (info
, h
);
885 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
886 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
888 /* If the new symbol with non-default visibility comes from a
889 relocatable file and the old definition comes from a dynamic
890 object, we remove the old definition. */
891 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
894 if ((h
->root
.und_next
|| info
->hash
->undefs_tail
== &h
->root
)
895 && bfd_is_und_section (sec
))
897 /* If the new symbol is undefined and the old symbol was
898 also undefined before, we need to make sure
899 _bfd_generic_link_add_one_symbol doesn't mess
900 up the linker hash table undefs list. Since the old
901 definition came from a dynamic object, it is still on the
903 h
->root
.type
= bfd_link_hash_undefined
;
904 /* FIXME: What if the new symbol is weak undefined? */
905 h
->root
.u
.undef
.abfd
= abfd
;
909 h
->root
.type
= bfd_link_hash_new
;
910 h
->root
.u
.undef
.abfd
= NULL
;
913 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
915 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_DEF_DYNAMIC
;
916 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_DYNAMIC
917 | ELF_LINK_DYNAMIC_DEF
);
919 /* FIXME: Should we check type and size for protected symbol? */
925 /* Differentiate strong and weak symbols. */
926 newweak
= bind
== STB_WEAK
;
927 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
928 || h
->root
.type
== bfd_link_hash_undefweak
);
930 /* If a new weak symbol definition comes from a regular file and the
931 old symbol comes from a dynamic library, we treat the new one as
932 strong. Similarly, an old weak symbol definition from a regular
933 file is treated as strong when the new symbol comes from a dynamic
934 library. Further, an old weak symbol from a dynamic library is
935 treated as strong if the new symbol is from a dynamic library.
936 This reflects the way glibc's ld.so works.
938 Do this before setting *type_change_ok or *size_change_ok so that
939 we warn properly when dynamic library symbols are overridden. */
941 if (newdef
&& !newdyn
&& olddyn
)
943 if (olddef
&& newdyn
)
946 /* It's OK to change the type if either the existing symbol or the
947 new symbol is weak. A type change is also OK if the old symbol
948 is undefined and the new symbol is defined. */
953 && h
->root
.type
== bfd_link_hash_undefined
))
954 *type_change_ok
= TRUE
;
956 /* It's OK to change the size if either the existing symbol or the
957 new symbol is weak, or if the old symbol is undefined. */
960 || h
->root
.type
== bfd_link_hash_undefined
)
961 *size_change_ok
= TRUE
;
963 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
964 symbol, respectively, appears to be a common symbol in a dynamic
965 object. If a symbol appears in an uninitialized section, and is
966 not weak, and is not a function, then it may be a common symbol
967 which was resolved when the dynamic object was created. We want
968 to treat such symbols specially, because they raise special
969 considerations when setting the symbol size: if the symbol
970 appears as a common symbol in a regular object, and the size in
971 the regular object is larger, we must make sure that we use the
972 larger size. This problematic case can always be avoided in C,
973 but it must be handled correctly when using Fortran shared
976 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
977 likewise for OLDDYNCOMMON and OLDDEF.
979 Note that this test is just a heuristic, and that it is quite
980 possible to have an uninitialized symbol in a shared object which
981 is really a definition, rather than a common symbol. This could
982 lead to some minor confusion when the symbol really is a common
983 symbol in some regular object. However, I think it will be
989 && (sec
->flags
& SEC_ALLOC
) != 0
990 && (sec
->flags
& SEC_LOAD
) == 0
992 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
995 newdyncommon
= FALSE
;
999 && h
->root
.type
== bfd_link_hash_defined
1000 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1001 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1002 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1004 && h
->type
!= STT_FUNC
)
1005 olddyncommon
= TRUE
;
1007 olddyncommon
= FALSE
;
1009 /* If both the old and the new symbols look like common symbols in a
1010 dynamic object, set the size of the symbol to the larger of the
1015 && sym
->st_size
!= h
->size
)
1017 /* Since we think we have two common symbols, issue a multiple
1018 common warning if desired. Note that we only warn if the
1019 size is different. If the size is the same, we simply let
1020 the old symbol override the new one as normally happens with
1021 symbols defined in dynamic objects. */
1023 if (! ((*info
->callbacks
->multiple_common
)
1024 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1025 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1028 if (sym
->st_size
> h
->size
)
1029 h
->size
= sym
->st_size
;
1031 *size_change_ok
= TRUE
;
1034 /* If we are looking at a dynamic object, and we have found a
1035 definition, we need to see if the symbol was already defined by
1036 some other object. If so, we want to use the existing
1037 definition, and we do not want to report a multiple symbol
1038 definition error; we do this by clobbering *PSEC to be
1039 bfd_und_section_ptr.
1041 We treat a common symbol as a definition if the symbol in the
1042 shared library is a function, since common symbols always
1043 represent variables; this can cause confusion in principle, but
1044 any such confusion would seem to indicate an erroneous program or
1045 shared library. We also permit a common symbol in a regular
1046 object to override a weak symbol in a shared object. */
1051 || (h
->root
.type
== bfd_link_hash_common
1053 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
1057 newdyncommon
= FALSE
;
1059 *psec
= sec
= bfd_und_section_ptr
;
1060 *size_change_ok
= TRUE
;
1062 /* If we get here when the old symbol is a common symbol, then
1063 we are explicitly letting it override a weak symbol or
1064 function in a dynamic object, and we don't want to warn about
1065 a type change. If the old symbol is a defined symbol, a type
1066 change warning may still be appropriate. */
1068 if (h
->root
.type
== bfd_link_hash_common
)
1069 *type_change_ok
= TRUE
;
1072 /* Handle the special case of an old common symbol merging with a
1073 new symbol which looks like a common symbol in a shared object.
1074 We change *PSEC and *PVALUE to make the new symbol look like a
1075 common symbol, and let _bfd_generic_link_add_one_symbol will do
1079 && h
->root
.type
== bfd_link_hash_common
)
1083 newdyncommon
= FALSE
;
1084 *pvalue
= sym
->st_size
;
1085 *psec
= sec
= bfd_com_section_ptr
;
1086 *size_change_ok
= TRUE
;
1089 /* If the old symbol is from a dynamic object, and the new symbol is
1090 a definition which is not from a dynamic object, then the new
1091 symbol overrides the old symbol. Symbols from regular files
1092 always take precedence over symbols from dynamic objects, even if
1093 they are defined after the dynamic object in the link.
1095 As above, we again permit a common symbol in a regular object to
1096 override a definition in a shared object if the shared object
1097 symbol is a function or is weak. */
1102 || (bfd_is_com_section (sec
)
1104 || h
->type
== STT_FUNC
)))
1107 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
1109 /* Change the hash table entry to undefined, and let
1110 _bfd_generic_link_add_one_symbol do the right thing with the
1113 h
->root
.type
= bfd_link_hash_undefined
;
1114 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1115 *size_change_ok
= TRUE
;
1118 olddyncommon
= FALSE
;
1120 /* We again permit a type change when a common symbol may be
1121 overriding a function. */
1123 if (bfd_is_com_section (sec
))
1124 *type_change_ok
= TRUE
;
1126 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1129 /* This union may have been set to be non-NULL when this symbol
1130 was seen in a dynamic object. We must force the union to be
1131 NULL, so that it is correct for a regular symbol. */
1132 h
->verinfo
.vertree
= NULL
;
1135 /* Handle the special case of a new common symbol merging with an
1136 old symbol that looks like it might be a common symbol defined in
1137 a shared object. Note that we have already handled the case in
1138 which a new common symbol should simply override the definition
1139 in the shared library. */
1142 && bfd_is_com_section (sec
)
1145 /* It would be best if we could set the hash table entry to a
1146 common symbol, but we don't know what to use for the section
1147 or the alignment. */
1148 if (! ((*info
->callbacks
->multiple_common
)
1149 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1150 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1153 /* If the presumed common symbol in the dynamic object is
1154 larger, pretend that the new symbol has its size. */
1156 if (h
->size
> *pvalue
)
1159 /* FIXME: We no longer know the alignment required by the symbol
1160 in the dynamic object, so we just wind up using the one from
1161 the regular object. */
1164 olddyncommon
= FALSE
;
1166 h
->root
.type
= bfd_link_hash_undefined
;
1167 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1169 *size_change_ok
= TRUE
;
1170 *type_change_ok
= TRUE
;
1172 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1175 h
->verinfo
.vertree
= NULL
;
1180 /* Handle the case where we had a versioned symbol in a dynamic
1181 library and now find a definition in a normal object. In this
1182 case, we make the versioned symbol point to the normal one. */
1183 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1184 flip
->root
.type
= h
->root
.type
;
1185 h
->root
.type
= bfd_link_hash_indirect
;
1186 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1187 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, flip
, h
);
1188 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1189 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1191 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_DEF_DYNAMIC
;
1192 flip
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1199 /* This function is called to create an indirect symbol from the
1200 default for the symbol with the default version if needed. The
1201 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1202 set DYNSYM if the new indirect symbol is dynamic. */
1205 _bfd_elf_add_default_symbol (bfd
*abfd
,
1206 struct bfd_link_info
*info
,
1207 struct elf_link_hash_entry
*h
,
1209 Elf_Internal_Sym
*sym
,
1212 bfd_boolean
*dynsym
,
1213 bfd_boolean override
)
1215 bfd_boolean type_change_ok
;
1216 bfd_boolean size_change_ok
;
1219 struct elf_link_hash_entry
*hi
;
1220 struct bfd_link_hash_entry
*bh
;
1221 const struct elf_backend_data
*bed
;
1222 bfd_boolean collect
;
1223 bfd_boolean dynamic
;
1225 size_t len
, shortlen
;
1228 /* If this symbol has a version, and it is the default version, we
1229 create an indirect symbol from the default name to the fully
1230 decorated name. This will cause external references which do not
1231 specify a version to be bound to this version of the symbol. */
1232 p
= strchr (name
, ELF_VER_CHR
);
1233 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1238 /* We are overridden by an old definition. We need to check if we
1239 need to create the indirect symbol from the default name. */
1240 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1242 BFD_ASSERT (hi
!= NULL
);
1245 while (hi
->root
.type
== bfd_link_hash_indirect
1246 || hi
->root
.type
== bfd_link_hash_warning
)
1248 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1254 bed
= get_elf_backend_data (abfd
);
1255 collect
= bed
->collect
;
1256 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1258 shortlen
= p
- name
;
1259 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1260 if (shortname
== NULL
)
1262 memcpy (shortname
, name
, shortlen
);
1263 shortname
[shortlen
] = '\0';
1265 /* We are going to create a new symbol. Merge it with any existing
1266 symbol with this name. For the purposes of the merge, act as
1267 though we were defining the symbol we just defined, although we
1268 actually going to define an indirect symbol. */
1269 type_change_ok
= FALSE
;
1270 size_change_ok
= FALSE
;
1272 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1273 &hi
, &skip
, &override
, &type_change_ok
,
1283 if (! (_bfd_generic_link_add_one_symbol
1284 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1285 0, name
, FALSE
, collect
, &bh
)))
1287 hi
= (struct elf_link_hash_entry
*) bh
;
1291 /* In this case the symbol named SHORTNAME is overriding the
1292 indirect symbol we want to add. We were planning on making
1293 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1294 is the name without a version. NAME is the fully versioned
1295 name, and it is the default version.
1297 Overriding means that we already saw a definition for the
1298 symbol SHORTNAME in a regular object, and it is overriding
1299 the symbol defined in the dynamic object.
1301 When this happens, we actually want to change NAME, the
1302 symbol we just added, to refer to SHORTNAME. This will cause
1303 references to NAME in the shared object to become references
1304 to SHORTNAME in the regular object. This is what we expect
1305 when we override a function in a shared object: that the
1306 references in the shared object will be mapped to the
1307 definition in the regular object. */
1309 while (hi
->root
.type
== bfd_link_hash_indirect
1310 || hi
->root
.type
== bfd_link_hash_warning
)
1311 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1313 h
->root
.type
= bfd_link_hash_indirect
;
1314 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1315 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1317 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1318 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1319 if (hi
->elf_link_hash_flags
1320 & (ELF_LINK_HASH_REF_REGULAR
1321 | ELF_LINK_HASH_DEF_REGULAR
))
1323 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1328 /* Now set HI to H, so that the following code will set the
1329 other fields correctly. */
1333 /* If there is a duplicate definition somewhere, then HI may not
1334 point to an indirect symbol. We will have reported an error to
1335 the user in that case. */
1337 if (hi
->root
.type
== bfd_link_hash_indirect
)
1339 struct elf_link_hash_entry
*ht
;
1341 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1342 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, ht
, hi
);
1344 /* See if the new flags lead us to realize that the symbol must
1351 || ((hi
->elf_link_hash_flags
1352 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1357 if ((hi
->elf_link_hash_flags
1358 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1364 /* We also need to define an indirection from the nondefault version
1368 len
= strlen (name
);
1369 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1370 if (shortname
== NULL
)
1372 memcpy (shortname
, name
, shortlen
);
1373 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1375 /* Once again, merge with any existing symbol. */
1376 type_change_ok
= FALSE
;
1377 size_change_ok
= FALSE
;
1379 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1380 &hi
, &skip
, &override
, &type_change_ok
,
1389 /* Here SHORTNAME is a versioned name, so we don't expect to see
1390 the type of override we do in the case above unless it is
1391 overridden by a versioned definition. */
1392 if (hi
->root
.type
!= bfd_link_hash_defined
1393 && hi
->root
.type
!= bfd_link_hash_defweak
)
1394 (*_bfd_error_handler
)
1395 (_("%s: warning: unexpected redefinition of indirect versioned symbol `%s'"),
1396 bfd_archive_filename (abfd
), shortname
);
1401 if (! (_bfd_generic_link_add_one_symbol
1402 (info
, abfd
, shortname
, BSF_INDIRECT
,
1403 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1405 hi
= (struct elf_link_hash_entry
*) bh
;
1407 /* If there is a duplicate definition somewhere, then HI may not
1408 point to an indirect symbol. We will have reported an error
1409 to the user in that case. */
1411 if (hi
->root
.type
== bfd_link_hash_indirect
)
1413 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
1415 /* See if the new flags lead us to realize that the symbol
1422 || ((hi
->elf_link_hash_flags
1423 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1428 if ((hi
->elf_link_hash_flags
1429 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1439 /* This routine is used to export all defined symbols into the dynamic
1440 symbol table. It is called via elf_link_hash_traverse. */
1443 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1445 struct elf_info_failed
*eif
= data
;
1447 /* Ignore indirect symbols. These are added by the versioning code. */
1448 if (h
->root
.type
== bfd_link_hash_indirect
)
1451 if (h
->root
.type
== bfd_link_hash_warning
)
1452 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1454 if (h
->dynindx
== -1
1455 && (h
->elf_link_hash_flags
1456 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
1458 struct bfd_elf_version_tree
*t
;
1459 struct bfd_elf_version_expr
*d
;
1461 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
1463 if (t
->globals
.list
!= NULL
)
1465 d
= (*t
->match
) (&t
->globals
, NULL
, h
->root
.root
.string
);
1470 if (t
->locals
.list
!= NULL
)
1472 d
= (*t
->match
) (&t
->locals
, NULL
, h
->root
.root
.string
);
1481 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1492 /* Look through the symbols which are defined in other shared
1493 libraries and referenced here. Update the list of version
1494 dependencies. This will be put into the .gnu.version_r section.
1495 This function is called via elf_link_hash_traverse. */
1498 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1501 struct elf_find_verdep_info
*rinfo
= data
;
1502 Elf_Internal_Verneed
*t
;
1503 Elf_Internal_Vernaux
*a
;
1506 if (h
->root
.type
== bfd_link_hash_warning
)
1507 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1509 /* We only care about symbols defined in shared objects with version
1511 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1512 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
1514 || h
->verinfo
.verdef
== NULL
)
1517 /* See if we already know about this version. */
1518 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
1520 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1523 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1524 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1530 /* This is a new version. Add it to tree we are building. */
1535 t
= bfd_zalloc (rinfo
->output_bfd
, amt
);
1538 rinfo
->failed
= TRUE
;
1542 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1543 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
1544 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
1548 a
= bfd_zalloc (rinfo
->output_bfd
, amt
);
1550 /* Note that we are copying a string pointer here, and testing it
1551 above. If bfd_elf_string_from_elf_section is ever changed to
1552 discard the string data when low in memory, this will have to be
1554 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1556 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1557 a
->vna_nextptr
= t
->vn_auxptr
;
1559 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1562 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1569 /* Figure out appropriate versions for all the symbols. We may not
1570 have the version number script until we have read all of the input
1571 files, so until that point we don't know which symbols should be
1572 local. This function is called via elf_link_hash_traverse. */
1575 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1577 struct elf_assign_sym_version_info
*sinfo
;
1578 struct bfd_link_info
*info
;
1579 const struct elf_backend_data
*bed
;
1580 struct elf_info_failed eif
;
1587 if (h
->root
.type
== bfd_link_hash_warning
)
1588 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1590 /* Fix the symbol flags. */
1593 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1596 sinfo
->failed
= TRUE
;
1600 /* We only need version numbers for symbols defined in regular
1602 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1605 bed
= get_elf_backend_data (sinfo
->output_bfd
);
1606 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1607 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1609 struct bfd_elf_version_tree
*t
;
1614 /* There are two consecutive ELF_VER_CHR characters if this is
1615 not a hidden symbol. */
1617 if (*p
== ELF_VER_CHR
)
1623 /* If there is no version string, we can just return out. */
1627 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
1631 /* Look for the version. If we find it, it is no longer weak. */
1632 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1634 if (strcmp (t
->name
, p
) == 0)
1638 struct bfd_elf_version_expr
*d
;
1640 len
= p
- h
->root
.root
.string
;
1641 alc
= bfd_malloc (len
);
1644 memcpy (alc
, h
->root
.root
.string
, len
- 1);
1645 alc
[len
- 1] = '\0';
1646 if (alc
[len
- 2] == ELF_VER_CHR
)
1647 alc
[len
- 2] = '\0';
1649 h
->verinfo
.vertree
= t
;
1653 if (t
->globals
.list
!= NULL
)
1654 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
1656 /* See if there is anything to force this symbol to
1658 if (d
== NULL
&& t
->locals
.list
!= NULL
)
1660 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
1664 && ! info
->export_dynamic
)
1665 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1673 /* If we are building an application, we need to create a
1674 version node for this version. */
1675 if (t
== NULL
&& info
->executable
)
1677 struct bfd_elf_version_tree
**pp
;
1680 /* If we aren't going to export this symbol, we don't need
1681 to worry about it. */
1682 if (h
->dynindx
== -1)
1686 t
= bfd_zalloc (sinfo
->output_bfd
, amt
);
1689 sinfo
->failed
= TRUE
;
1694 t
->name_indx
= (unsigned int) -1;
1698 /* Don't count anonymous version tag. */
1699 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
1701 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
1703 t
->vernum
= version_index
;
1707 h
->verinfo
.vertree
= t
;
1711 /* We could not find the version for a symbol when
1712 generating a shared archive. Return an error. */
1713 (*_bfd_error_handler
)
1714 (_("%s: undefined versioned symbol name %s"),
1715 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
1716 bfd_set_error (bfd_error_bad_value
);
1717 sinfo
->failed
= TRUE
;
1722 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
1725 /* If we don't have a version for this symbol, see if we can find
1727 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
1729 struct bfd_elf_version_tree
*t
;
1730 struct bfd_elf_version_tree
*local_ver
;
1731 struct bfd_elf_version_expr
*d
;
1733 /* See if can find what version this symbol is in. If the
1734 symbol is supposed to be local, then don't actually register
1737 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1739 if (t
->globals
.list
!= NULL
)
1741 bfd_boolean matched
;
1745 while ((d
= (*t
->match
) (&t
->globals
, d
,
1746 h
->root
.root
.string
)) != NULL
)
1751 /* There is a version without definition. Make
1752 the symbol the default definition for this
1754 h
->verinfo
.vertree
= t
;
1762 /* There is no undefined version for this symbol. Hide the
1764 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1767 if (t
->locals
.list
!= NULL
)
1770 while ((d
= (*t
->match
) (&t
->locals
, d
,
1771 h
->root
.root
.string
)) != NULL
)
1774 /* If the match is "*", keep looking for a more
1775 explicit, perhaps even global, match.
1776 XXX: Shouldn't this be !d->wildcard instead? */
1777 if (d
->pattern
[0] != '*' || d
->pattern
[1] != '\0')
1786 if (local_ver
!= NULL
)
1788 h
->verinfo
.vertree
= local_ver
;
1789 if (h
->dynindx
!= -1
1791 && ! info
->export_dynamic
)
1793 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1801 /* Read and swap the relocs from the section indicated by SHDR. This
1802 may be either a REL or a RELA section. The relocations are
1803 translated into RELA relocations and stored in INTERNAL_RELOCS,
1804 which should have already been allocated to contain enough space.
1805 The EXTERNAL_RELOCS are a buffer where the external form of the
1806 relocations should be stored.
1808 Returns FALSE if something goes wrong. */
1811 elf_link_read_relocs_from_section (bfd
*abfd
,
1813 Elf_Internal_Shdr
*shdr
,
1814 void *external_relocs
,
1815 Elf_Internal_Rela
*internal_relocs
)
1817 const struct elf_backend_data
*bed
;
1818 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
1819 const bfd_byte
*erela
;
1820 const bfd_byte
*erelaend
;
1821 Elf_Internal_Rela
*irela
;
1822 Elf_Internal_Shdr
*symtab_hdr
;
1825 /* Position ourselves at the start of the section. */
1826 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
1829 /* Read the relocations. */
1830 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
1833 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1834 nsyms
= symtab_hdr
->sh_size
/ symtab_hdr
->sh_entsize
;
1836 bed
= get_elf_backend_data (abfd
);
1838 /* Convert the external relocations to the internal format. */
1839 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
1840 swap_in
= bed
->s
->swap_reloc_in
;
1841 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
1842 swap_in
= bed
->s
->swap_reloca_in
;
1845 bfd_set_error (bfd_error_wrong_format
);
1849 erela
= external_relocs
;
1850 erelaend
= erela
+ shdr
->sh_size
;
1851 irela
= internal_relocs
;
1852 while (erela
< erelaend
)
1856 (*swap_in
) (abfd
, erela
, irela
);
1857 r_symndx
= ELF32_R_SYM (irela
->r_info
);
1858 if (bed
->s
->arch_size
== 64)
1860 if ((size_t) r_symndx
>= nsyms
)
1862 char *sec_name
= bfd_get_section_ident (sec
);
1863 (*_bfd_error_handler
)
1864 (_("%s: bad reloc symbol index (0x%lx >= 0x%lx) for offset 0x%lx in section `%s'"),
1865 bfd_archive_filename (abfd
), (unsigned long) r_symndx
,
1866 (unsigned long) nsyms
, irela
->r_offset
,
1867 sec_name
? sec_name
: sec
->name
);
1870 bfd_set_error (bfd_error_bad_value
);
1873 irela
+= bed
->s
->int_rels_per_ext_rel
;
1874 erela
+= shdr
->sh_entsize
;
1880 /* Read and swap the relocs for a section O. They may have been
1881 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
1882 not NULL, they are used as buffers to read into. They are known to
1883 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
1884 the return value is allocated using either malloc or bfd_alloc,
1885 according to the KEEP_MEMORY argument. If O has two relocation
1886 sections (both REL and RELA relocations), then the REL_HDR
1887 relocations will appear first in INTERNAL_RELOCS, followed by the
1888 REL_HDR2 relocations. */
1891 _bfd_elf_link_read_relocs (bfd
*abfd
,
1893 void *external_relocs
,
1894 Elf_Internal_Rela
*internal_relocs
,
1895 bfd_boolean keep_memory
)
1897 Elf_Internal_Shdr
*rel_hdr
;
1898 void *alloc1
= NULL
;
1899 Elf_Internal_Rela
*alloc2
= NULL
;
1900 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1902 if (elf_section_data (o
)->relocs
!= NULL
)
1903 return elf_section_data (o
)->relocs
;
1905 if (o
->reloc_count
== 0)
1908 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1910 if (internal_relocs
== NULL
)
1914 size
= o
->reloc_count
;
1915 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
1917 internal_relocs
= bfd_alloc (abfd
, size
);
1919 internal_relocs
= alloc2
= bfd_malloc (size
);
1920 if (internal_relocs
== NULL
)
1924 if (external_relocs
== NULL
)
1926 bfd_size_type size
= rel_hdr
->sh_size
;
1928 if (elf_section_data (o
)->rel_hdr2
)
1929 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
1930 alloc1
= bfd_malloc (size
);
1933 external_relocs
= alloc1
;
1936 if (!elf_link_read_relocs_from_section (abfd
, o
, rel_hdr
,
1940 if (elf_section_data (o
)->rel_hdr2
1941 && (!elf_link_read_relocs_from_section
1943 elf_section_data (o
)->rel_hdr2
,
1944 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
1945 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
1946 * bed
->s
->int_rels_per_ext_rel
))))
1949 /* Cache the results for next time, if we can. */
1951 elf_section_data (o
)->relocs
= internal_relocs
;
1956 /* Don't free alloc2, since if it was allocated we are passing it
1957 back (under the name of internal_relocs). */
1959 return internal_relocs
;
1969 /* Compute the size of, and allocate space for, REL_HDR which is the
1970 section header for a section containing relocations for O. */
1973 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
1974 Elf_Internal_Shdr
*rel_hdr
,
1977 bfd_size_type reloc_count
;
1978 bfd_size_type num_rel_hashes
;
1980 /* Figure out how many relocations there will be. */
1981 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
1982 reloc_count
= elf_section_data (o
)->rel_count
;
1984 reloc_count
= elf_section_data (o
)->rel_count2
;
1986 num_rel_hashes
= o
->reloc_count
;
1987 if (num_rel_hashes
< reloc_count
)
1988 num_rel_hashes
= reloc_count
;
1990 /* That allows us to calculate the size of the section. */
1991 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
1993 /* The contents field must last into write_object_contents, so we
1994 allocate it with bfd_alloc rather than malloc. Also since we
1995 cannot be sure that the contents will actually be filled in,
1996 we zero the allocated space. */
1997 rel_hdr
->contents
= bfd_zalloc (abfd
, rel_hdr
->sh_size
);
1998 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2001 /* We only allocate one set of hash entries, so we only do it the
2002 first time we are called. */
2003 if (elf_section_data (o
)->rel_hashes
== NULL
2006 struct elf_link_hash_entry
**p
;
2008 p
= bfd_zmalloc (num_rel_hashes
* sizeof (struct elf_link_hash_entry
*));
2012 elf_section_data (o
)->rel_hashes
= p
;
2018 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2019 originated from the section given by INPUT_REL_HDR) to the
2023 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2024 asection
*input_section
,
2025 Elf_Internal_Shdr
*input_rel_hdr
,
2026 Elf_Internal_Rela
*internal_relocs
)
2028 Elf_Internal_Rela
*irela
;
2029 Elf_Internal_Rela
*irelaend
;
2031 Elf_Internal_Shdr
*output_rel_hdr
;
2032 asection
*output_section
;
2033 unsigned int *rel_countp
= NULL
;
2034 const struct elf_backend_data
*bed
;
2035 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2037 output_section
= input_section
->output_section
;
2038 output_rel_hdr
= NULL
;
2040 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
2041 == input_rel_hdr
->sh_entsize
)
2043 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
2044 rel_countp
= &elf_section_data (output_section
)->rel_count
;
2046 else if (elf_section_data (output_section
)->rel_hdr2
2047 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
2048 == input_rel_hdr
->sh_entsize
))
2050 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
2051 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
2055 char *sec_name
= bfd_get_section_ident (input_section
);
2056 (*_bfd_error_handler
)
2057 (_("%s: relocation size mismatch in %s section %s"),
2058 bfd_get_filename (output_bfd
),
2059 bfd_archive_filename (input_section
->owner
),
2060 sec_name
? sec_name
: input_section
->name
);
2063 bfd_set_error (bfd_error_wrong_object_format
);
2067 bed
= get_elf_backend_data (output_bfd
);
2068 if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2069 swap_out
= bed
->s
->swap_reloc_out
;
2070 else if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2071 swap_out
= bed
->s
->swap_reloca_out
;
2075 erel
= output_rel_hdr
->contents
;
2076 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
2077 irela
= internal_relocs
;
2078 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2079 * bed
->s
->int_rels_per_ext_rel
);
2080 while (irela
< irelaend
)
2082 (*swap_out
) (output_bfd
, irela
, erel
);
2083 irela
+= bed
->s
->int_rels_per_ext_rel
;
2084 erel
+= input_rel_hdr
->sh_entsize
;
2087 /* Bump the counter, so that we know where to add the next set of
2089 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2094 /* Fix up the flags for a symbol. This handles various cases which
2095 can only be fixed after all the input files are seen. This is
2096 currently called by both adjust_dynamic_symbol and
2097 assign_sym_version, which is unnecessary but perhaps more robust in
2098 the face of future changes. */
2101 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2102 struct elf_info_failed
*eif
)
2104 /* If this symbol was mentioned in a non-ELF file, try to set
2105 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2106 permit a non-ELF file to correctly refer to a symbol defined in
2107 an ELF dynamic object. */
2108 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2110 while (h
->root
.type
== bfd_link_hash_indirect
)
2111 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2113 if (h
->root
.type
!= bfd_link_hash_defined
2114 && h
->root
.type
!= bfd_link_hash_defweak
)
2115 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
2116 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
2119 if (h
->root
.u
.def
.section
->owner
!= NULL
2120 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2121 == bfd_target_elf_flavour
))
2122 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
2123 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
2125 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2128 if (h
->dynindx
== -1
2129 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2130 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2132 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2141 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
2142 was first seen in a non-ELF file. Fortunately, if the symbol
2143 was first seen in an ELF file, we're probably OK unless the
2144 symbol was defined in a non-ELF file. Catch that case here.
2145 FIXME: We're still in trouble if the symbol was first seen in
2146 a dynamic object, and then later in a non-ELF regular object. */
2147 if ((h
->root
.type
== bfd_link_hash_defined
2148 || h
->root
.type
== bfd_link_hash_defweak
)
2149 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2150 && (h
->root
.u
.def
.section
->owner
!= NULL
2151 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2152 != bfd_target_elf_flavour
)
2153 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2154 && (h
->elf_link_hash_flags
2155 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
2156 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2159 /* If this is a final link, and the symbol was defined as a common
2160 symbol in a regular object file, and there was no definition in
2161 any dynamic object, then the linker will have allocated space for
2162 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2163 flag will not have been set. */
2164 if (h
->root
.type
== bfd_link_hash_defined
2165 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2166 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2167 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2168 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2169 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2171 /* If -Bsymbolic was used (which means to bind references to global
2172 symbols to the definition within the shared object), and this
2173 symbol was defined in a regular object, then it actually doesn't
2174 need a PLT entry. Likewise, if the symbol has non-default
2175 visibility. If the symbol has hidden or internal visibility, we
2176 will force it local. */
2177 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2178 && eif
->info
->shared
2179 && is_elf_hash_table (eif
->info
->hash
)
2180 && (eif
->info
->symbolic
2181 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2182 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2184 const struct elf_backend_data
*bed
;
2185 bfd_boolean force_local
;
2187 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2189 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2190 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2191 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2194 /* If a weak undefined symbol has non-default visibility, we also
2195 hide it from the dynamic linker. */
2196 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2197 && h
->root
.type
== bfd_link_hash_undefweak
)
2199 const struct elf_backend_data
*bed
;
2200 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2201 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2204 /* If this is a weak defined symbol in a dynamic object, and we know
2205 the real definition in the dynamic object, copy interesting flags
2206 over to the real definition. */
2207 if (h
->weakdef
!= NULL
)
2209 struct elf_link_hash_entry
*weakdef
;
2211 weakdef
= h
->weakdef
;
2212 if (h
->root
.type
== bfd_link_hash_indirect
)
2213 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2215 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2216 || h
->root
.type
== bfd_link_hash_defweak
);
2217 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2218 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2219 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2221 /* If the real definition is defined by a regular object file,
2222 don't do anything special. See the longer description in
2223 _bfd_elf_adjust_dynamic_symbol, below. */
2224 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2228 const struct elf_backend_data
*bed
;
2230 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2231 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, weakdef
, h
);
2238 /* Make the backend pick a good value for a dynamic symbol. This is
2239 called via elf_link_hash_traverse, and also calls itself
2243 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2245 struct elf_info_failed
*eif
= data
;
2247 const struct elf_backend_data
*bed
;
2249 if (! is_elf_hash_table (eif
->info
->hash
))
2252 if (h
->root
.type
== bfd_link_hash_warning
)
2254 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
2255 h
->got
= elf_hash_table (eif
->info
)->init_offset
;
2257 /* When warning symbols are created, they **replace** the "real"
2258 entry in the hash table, thus we never get to see the real
2259 symbol in a hash traversal. So look at it now. */
2260 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2263 /* Ignore indirect symbols. These are added by the versioning code. */
2264 if (h
->root
.type
== bfd_link_hash_indirect
)
2267 /* Fix the symbol flags. */
2268 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2271 /* If this symbol does not require a PLT entry, and it is not
2272 defined by a dynamic object, or is not referenced by a regular
2273 object, ignore it. We do have to handle a weak defined symbol,
2274 even if no regular object refers to it, if we decided to add it
2275 to the dynamic symbol table. FIXME: Do we normally need to worry
2276 about symbols which are defined by one dynamic object and
2277 referenced by another one? */
2278 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2279 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2280 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2281 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2282 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2284 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
2288 /* If we've already adjusted this symbol, don't do it again. This
2289 can happen via a recursive call. */
2290 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2293 /* Don't look at this symbol again. Note that we must set this
2294 after checking the above conditions, because we may look at a
2295 symbol once, decide not to do anything, and then get called
2296 recursively later after REF_REGULAR is set below. */
2297 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2299 /* If this is a weak definition, and we know a real definition, and
2300 the real symbol is not itself defined by a regular object file,
2301 then get a good value for the real definition. We handle the
2302 real symbol first, for the convenience of the backend routine.
2304 Note that there is a confusing case here. If the real definition
2305 is defined by a regular object file, we don't get the real symbol
2306 from the dynamic object, but we do get the weak symbol. If the
2307 processor backend uses a COPY reloc, then if some routine in the
2308 dynamic object changes the real symbol, we will not see that
2309 change in the corresponding weak symbol. This is the way other
2310 ELF linkers work as well, and seems to be a result of the shared
2313 I will clarify this issue. Most SVR4 shared libraries define the
2314 variable _timezone and define timezone as a weak synonym. The
2315 tzset call changes _timezone. If you write
2316 extern int timezone;
2318 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2319 you might expect that, since timezone is a synonym for _timezone,
2320 the same number will print both times. However, if the processor
2321 backend uses a COPY reloc, then actually timezone will be copied
2322 into your process image, and, since you define _timezone
2323 yourself, _timezone will not. Thus timezone and _timezone will
2324 wind up at different memory locations. The tzset call will set
2325 _timezone, leaving timezone unchanged. */
2327 if (h
->weakdef
!= NULL
)
2329 /* If we get to this point, we know there is an implicit
2330 reference by a regular object file via the weak symbol H.
2331 FIXME: Is this really true? What if the traversal finds
2332 H->WEAKDEF before it finds H? */
2333 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2335 if (! _bfd_elf_adjust_dynamic_symbol (h
->weakdef
, eif
))
2339 /* If a symbol has no type and no size and does not require a PLT
2340 entry, then we are probably about to do the wrong thing here: we
2341 are probably going to create a COPY reloc for an empty object.
2342 This case can arise when a shared object is built with assembly
2343 code, and the assembly code fails to set the symbol type. */
2345 && h
->type
== STT_NOTYPE
2346 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
2347 (*_bfd_error_handler
)
2348 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2349 h
->root
.root
.string
);
2351 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2352 bed
= get_elf_backend_data (dynobj
);
2353 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2362 /* Adjust all external symbols pointing into SEC_MERGE sections
2363 to reflect the object merging within the sections. */
2366 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2370 if (h
->root
.type
== bfd_link_hash_warning
)
2371 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2373 if ((h
->root
.type
== bfd_link_hash_defined
2374 || h
->root
.type
== bfd_link_hash_defweak
)
2375 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2376 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2378 bfd
*output_bfd
= data
;
2380 h
->root
.u
.def
.value
=
2381 _bfd_merged_section_offset (output_bfd
,
2382 &h
->root
.u
.def
.section
,
2383 elf_section_data (sec
)->sec_info
,
2384 h
->root
.u
.def
.value
);
2390 /* Returns false if the symbol referred to by H should be considered
2391 to resolve local to the current module, and true if it should be
2392 considered to bind dynamically. */
2395 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2396 struct bfd_link_info
*info
,
2397 bfd_boolean ignore_protected
)
2399 bfd_boolean binding_stays_local_p
;
2404 while (h
->root
.type
== bfd_link_hash_indirect
2405 || h
->root
.type
== bfd_link_hash_warning
)
2406 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2408 /* If it was forced local, then clearly it's not dynamic. */
2409 if (h
->dynindx
== -1)
2411 if (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
)
2414 /* Identify the cases where name binding rules say that a
2415 visible symbol resolves locally. */
2416 binding_stays_local_p
= info
->executable
|| info
->symbolic
;
2418 switch (ELF_ST_VISIBILITY (h
->other
))
2425 /* Proper resolution for function pointer equality may require
2426 that these symbols perhaps be resolved dynamically, even though
2427 we should be resolving them to the current module. */
2428 if (!ignore_protected
)
2429 binding_stays_local_p
= TRUE
;
2436 /* If it isn't defined locally, then clearly it's dynamic. */
2437 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2440 /* Otherwise, the symbol is dynamic if binding rules don't tell
2441 us that it remains local. */
2442 return !binding_stays_local_p
;
2445 /* Return true if the symbol referred to by H should be considered
2446 to resolve local to the current module, and false otherwise. Differs
2447 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2448 undefined symbols and weak symbols. */
2451 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2452 struct bfd_link_info
*info
,
2453 bfd_boolean local_protected
)
2455 /* If it's a local sym, of course we resolve locally. */
2459 /* Common symbols that become definitions don't get the DEF_REGULAR
2460 flag set, so test it first, and don't bail out. */
2461 if (ELF_COMMON_DEF_P (h
))
2463 /* If we don't have a definition in a regular file, then we can't
2464 resolve locally. The sym is either undefined or dynamic. */
2465 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2468 /* Forced local symbols resolve locally. */
2469 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
2472 /* As do non-dynamic symbols. */
2473 if (h
->dynindx
== -1)
2476 /* At this point, we know the symbol is defined and dynamic. In an
2477 executable it must resolve locally, likewise when building symbolic
2478 shared libraries. */
2479 if (info
->executable
|| info
->symbolic
)
2482 /* Now deal with defined dynamic symbols in shared libraries. Ones
2483 with default visibility might not resolve locally. */
2484 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2487 /* However, STV_HIDDEN or STV_INTERNAL ones must be local. */
2488 if (ELF_ST_VISIBILITY (h
->other
) != STV_PROTECTED
)
2491 /* Function pointer equality tests may require that STV_PROTECTED
2492 symbols be treated as dynamic symbols, even when we know that the
2493 dynamic linker will resolve them locally. */
2494 return local_protected
;
2497 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2498 aligned. Returns the first TLS output section. */
2500 struct bfd_section
*
2501 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2503 struct bfd_section
*sec
, *tls
;
2504 unsigned int align
= 0;
2506 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2507 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2511 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2512 if (sec
->alignment_power
> align
)
2513 align
= sec
->alignment_power
;
2515 elf_hash_table (info
)->tls_sec
= tls
;
2517 /* Ensure the alignment of the first section is the largest alignment,
2518 so that the tls segment starts aligned. */
2520 tls
->alignment_power
= align
;
2525 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2527 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2528 Elf_Internal_Sym
*sym
)
2530 /* Local symbols do not count, but target specific ones might. */
2531 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2532 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2535 /* Function symbols do not count. */
2536 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
2539 /* If the section is undefined, then so is the symbol. */
2540 if (sym
->st_shndx
== SHN_UNDEF
)
2543 /* If the symbol is defined in the common section, then
2544 it is a common definition and so does not count. */
2545 if (sym
->st_shndx
== SHN_COMMON
)
2548 /* If the symbol is in a target specific section then we
2549 must rely upon the backend to tell us what it is. */
2550 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2551 /* FIXME - this function is not coded yet:
2553 return _bfd_is_global_symbol_definition (abfd, sym);
2555 Instead for now assume that the definition is not global,
2556 Even if this is wrong, at least the linker will behave
2557 in the same way that it used to do. */
2563 /* Search the symbol table of the archive element of the archive ABFD
2564 whose archive map contains a mention of SYMDEF, and determine if
2565 the symbol is defined in this element. */
2567 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2569 Elf_Internal_Shdr
* hdr
;
2570 bfd_size_type symcount
;
2571 bfd_size_type extsymcount
;
2572 bfd_size_type extsymoff
;
2573 Elf_Internal_Sym
*isymbuf
;
2574 Elf_Internal_Sym
*isym
;
2575 Elf_Internal_Sym
*isymend
;
2578 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2582 if (! bfd_check_format (abfd
, bfd_object
))
2585 /* If we have already included the element containing this symbol in the
2586 link then we do not need to include it again. Just claim that any symbol
2587 it contains is not a definition, so that our caller will not decide to
2588 (re)include this element. */
2589 if (abfd
->archive_pass
)
2592 /* Select the appropriate symbol table. */
2593 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2594 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2596 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2598 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2600 /* The sh_info field of the symtab header tells us where the
2601 external symbols start. We don't care about the local symbols. */
2602 if (elf_bad_symtab (abfd
))
2604 extsymcount
= symcount
;
2609 extsymcount
= symcount
- hdr
->sh_info
;
2610 extsymoff
= hdr
->sh_info
;
2613 if (extsymcount
== 0)
2616 /* Read in the symbol table. */
2617 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
2619 if (isymbuf
== NULL
)
2622 /* Scan the symbol table looking for SYMDEF. */
2624 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
2628 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
2633 if (strcmp (name
, symdef
->name
) == 0)
2635 result
= is_global_data_symbol_definition (abfd
, isym
);
2645 /* Add an entry to the .dynamic table. */
2648 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
2652 struct elf_link_hash_table
*hash_table
;
2653 const struct elf_backend_data
*bed
;
2655 bfd_size_type newsize
;
2656 bfd_byte
*newcontents
;
2657 Elf_Internal_Dyn dyn
;
2659 hash_table
= elf_hash_table (info
);
2660 if (! is_elf_hash_table (hash_table
))
2663 bed
= get_elf_backend_data (hash_table
->dynobj
);
2664 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
2665 BFD_ASSERT (s
!= NULL
);
2667 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
2668 newcontents
= bfd_realloc (s
->contents
, newsize
);
2669 if (newcontents
== NULL
)
2673 dyn
.d_un
.d_val
= val
;
2674 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
2677 s
->contents
= newcontents
;
2682 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
2683 otherwise just check whether one already exists. Returns -1 on error,
2684 1 if a DT_NEEDED tag already exists, and 0 on success. */
2687 elf_add_dt_needed_tag (struct bfd_link_info
*info
,
2691 struct elf_link_hash_table
*hash_table
;
2692 bfd_size_type oldsize
;
2693 bfd_size_type strindex
;
2695 hash_table
= elf_hash_table (info
);
2696 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2697 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
2698 if (strindex
== (bfd_size_type
) -1)
2701 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2704 const struct elf_backend_data
*bed
;
2707 bed
= get_elf_backend_data (hash_table
->dynobj
);
2708 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
2709 BFD_ASSERT (sdyn
!= NULL
);
2711 for (extdyn
= sdyn
->contents
;
2712 extdyn
< sdyn
->contents
+ sdyn
->size
;
2713 extdyn
+= bed
->s
->sizeof_dyn
)
2715 Elf_Internal_Dyn dyn
;
2717 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
2718 if (dyn
.d_tag
== DT_NEEDED
2719 && dyn
.d_un
.d_val
== strindex
)
2721 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
2729 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
2733 /* We were just checking for existence of the tag. */
2734 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
2739 /* Sort symbol by value and section. */
2741 elf_sort_symbol (const void *arg1
, const void *arg2
)
2743 const struct elf_link_hash_entry
*h1
;
2744 const struct elf_link_hash_entry
*h2
;
2745 bfd_signed_vma vdiff
;
2747 h1
= *(const struct elf_link_hash_entry
**) arg1
;
2748 h2
= *(const struct elf_link_hash_entry
**) arg2
;
2749 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
2751 return vdiff
> 0 ? 1 : -1;
2754 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
2756 return sdiff
> 0 ? 1 : -1;
2761 /* This function is used to adjust offsets into .dynstr for
2762 dynamic symbols. This is called via elf_link_hash_traverse. */
2765 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
2767 struct elf_strtab_hash
*dynstr
= data
;
2769 if (h
->root
.type
== bfd_link_hash_warning
)
2770 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2772 if (h
->dynindx
!= -1)
2773 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
2777 /* Assign string offsets in .dynstr, update all structures referencing
2781 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
2783 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
2784 struct elf_link_local_dynamic_entry
*entry
;
2785 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
2786 bfd
*dynobj
= hash_table
->dynobj
;
2789 const struct elf_backend_data
*bed
;
2792 _bfd_elf_strtab_finalize (dynstr
);
2793 size
= _bfd_elf_strtab_size (dynstr
);
2795 bed
= get_elf_backend_data (dynobj
);
2796 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2797 BFD_ASSERT (sdyn
!= NULL
);
2799 /* Update all .dynamic entries referencing .dynstr strings. */
2800 for (extdyn
= sdyn
->contents
;
2801 extdyn
< sdyn
->contents
+ sdyn
->size
;
2802 extdyn
+= bed
->s
->sizeof_dyn
)
2804 Elf_Internal_Dyn dyn
;
2806 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
2810 dyn
.d_un
.d_val
= size
;
2818 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
2823 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
2826 /* Now update local dynamic symbols. */
2827 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
2828 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
2829 entry
->isym
.st_name
);
2831 /* And the rest of dynamic symbols. */
2832 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
2834 /* Adjust version definitions. */
2835 if (elf_tdata (output_bfd
)->cverdefs
)
2840 Elf_Internal_Verdef def
;
2841 Elf_Internal_Verdaux defaux
;
2843 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2847 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
2849 p
+= sizeof (Elf_External_Verdef
);
2850 for (i
= 0; i
< def
.vd_cnt
; ++i
)
2852 _bfd_elf_swap_verdaux_in (output_bfd
,
2853 (Elf_External_Verdaux
*) p
, &defaux
);
2854 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
2856 _bfd_elf_swap_verdaux_out (output_bfd
,
2857 &defaux
, (Elf_External_Verdaux
*) p
);
2858 p
+= sizeof (Elf_External_Verdaux
);
2861 while (def
.vd_next
);
2864 /* Adjust version references. */
2865 if (elf_tdata (output_bfd
)->verref
)
2870 Elf_Internal_Verneed need
;
2871 Elf_Internal_Vernaux needaux
;
2873 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2877 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
2879 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
2880 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
2881 (Elf_External_Verneed
*) p
);
2882 p
+= sizeof (Elf_External_Verneed
);
2883 for (i
= 0; i
< need
.vn_cnt
; ++i
)
2885 _bfd_elf_swap_vernaux_in (output_bfd
,
2886 (Elf_External_Vernaux
*) p
, &needaux
);
2887 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
2889 _bfd_elf_swap_vernaux_out (output_bfd
,
2891 (Elf_External_Vernaux
*) p
);
2892 p
+= sizeof (Elf_External_Vernaux
);
2895 while (need
.vn_next
);
2901 /* Add symbols from an ELF object file to the linker hash table. */
2904 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
2906 bfd_boolean (*add_symbol_hook
)
2907 (bfd
*, struct bfd_link_info
*, Elf_Internal_Sym
*,
2908 const char **, flagword
*, asection
**, bfd_vma
*);
2909 bfd_boolean (*check_relocs
)
2910 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
2911 bfd_boolean (*check_directives
)
2912 (bfd
*, struct bfd_link_info
*);
2913 bfd_boolean collect
;
2914 Elf_Internal_Shdr
*hdr
;
2915 bfd_size_type symcount
;
2916 bfd_size_type extsymcount
;
2917 bfd_size_type extsymoff
;
2918 struct elf_link_hash_entry
**sym_hash
;
2919 bfd_boolean dynamic
;
2920 Elf_External_Versym
*extversym
= NULL
;
2921 Elf_External_Versym
*ever
;
2922 struct elf_link_hash_entry
*weaks
;
2923 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
2924 bfd_size_type nondeflt_vers_cnt
= 0;
2925 Elf_Internal_Sym
*isymbuf
= NULL
;
2926 Elf_Internal_Sym
*isym
;
2927 Elf_Internal_Sym
*isymend
;
2928 const struct elf_backend_data
*bed
;
2929 bfd_boolean add_needed
;
2930 struct elf_link_hash_table
* hash_table
;
2933 hash_table
= elf_hash_table (info
);
2935 bed
= get_elf_backend_data (abfd
);
2936 add_symbol_hook
= bed
->elf_add_symbol_hook
;
2937 collect
= bed
->collect
;
2939 if ((abfd
->flags
& DYNAMIC
) == 0)
2945 /* You can't use -r against a dynamic object. Also, there's no
2946 hope of using a dynamic object which does not exactly match
2947 the format of the output file. */
2948 if (info
->relocatable
2949 || !is_elf_hash_table (hash_table
)
2950 || hash_table
->root
.creator
!= abfd
->xvec
)
2952 bfd_set_error (bfd_error_invalid_operation
);
2957 /* As a GNU extension, any input sections which are named
2958 .gnu.warning.SYMBOL are treated as warning symbols for the given
2959 symbol. This differs from .gnu.warning sections, which generate
2960 warnings when they are included in an output file. */
2961 if (info
->executable
)
2965 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2969 name
= bfd_get_section_name (abfd
, s
);
2970 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
2974 bfd_size_type prefix_len
;
2975 const char * gnu_warning_prefix
= _("warning: ");
2977 name
+= sizeof ".gnu.warning." - 1;
2979 /* If this is a shared object, then look up the symbol
2980 in the hash table. If it is there, and it is already
2981 been defined, then we will not be using the entry
2982 from this shared object, so we don't need to warn.
2983 FIXME: If we see the definition in a regular object
2984 later on, we will warn, but we shouldn't. The only
2985 fix is to keep track of what warnings we are supposed
2986 to emit, and then handle them all at the end of the
2990 struct elf_link_hash_entry
*h
;
2992 h
= elf_link_hash_lookup (hash_table
, name
,
2993 FALSE
, FALSE
, TRUE
);
2995 /* FIXME: What about bfd_link_hash_common? */
2997 && (h
->root
.type
== bfd_link_hash_defined
2998 || h
->root
.type
== bfd_link_hash_defweak
))
3000 /* We don't want to issue this warning. Clobber
3001 the section size so that the warning does not
3002 get copied into the output file. */
3009 prefix_len
= strlen (gnu_warning_prefix
);
3010 msg
= bfd_alloc (abfd
, prefix_len
+ sz
+ 1);
3014 strcpy (msg
, gnu_warning_prefix
);
3015 if (! bfd_get_section_contents (abfd
, s
, msg
+ prefix_len
, 0, sz
))
3018 msg
[prefix_len
+ sz
] = '\0';
3020 if (! (_bfd_generic_link_add_one_symbol
3021 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3022 FALSE
, collect
, NULL
)))
3025 if (! info
->relocatable
)
3027 /* Clobber the section size so that the warning does
3028 not get copied into the output file. */
3038 /* If we are creating a shared library, create all the dynamic
3039 sections immediately. We need to attach them to something,
3040 so we attach them to this BFD, provided it is the right
3041 format. FIXME: If there are no input BFD's of the same
3042 format as the output, we can't make a shared library. */
3044 && is_elf_hash_table (hash_table
)
3045 && hash_table
->root
.creator
== abfd
->xvec
3046 && ! hash_table
->dynamic_sections_created
)
3048 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3052 else if (!is_elf_hash_table (hash_table
))
3057 const char *soname
= NULL
;
3058 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3061 /* ld --just-symbols and dynamic objects don't mix very well.
3062 Test for --just-symbols by looking at info set up by
3063 _bfd_elf_link_just_syms. */
3064 if ((s
= abfd
->sections
) != NULL
3065 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3068 /* If this dynamic lib was specified on the command line with
3069 --as-needed in effect, then we don't want to add a DT_NEEDED
3070 tag unless the lib is actually used. Similary for libs brought
3071 in by another lib's DT_NEEDED. When --no-add-needed is used
3072 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3073 any dynamic library in DT_NEEDED tags in the dynamic lib at
3075 add_needed
= (elf_dyn_lib_class (abfd
)
3076 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3077 | DYN_NO_NEEDED
)) == 0;
3079 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3085 unsigned long shlink
;
3087 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3088 goto error_free_dyn
;
3090 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3092 goto error_free_dyn
;
3093 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3095 for (extdyn
= dynbuf
;
3096 extdyn
< dynbuf
+ s
->size
;
3097 extdyn
+= bed
->s
->sizeof_dyn
)
3099 Elf_Internal_Dyn dyn
;
3101 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3102 if (dyn
.d_tag
== DT_SONAME
)
3104 unsigned int tagv
= dyn
.d_un
.d_val
;
3105 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3107 goto error_free_dyn
;
3109 if (dyn
.d_tag
== DT_NEEDED
)
3111 struct bfd_link_needed_list
*n
, **pn
;
3113 unsigned int tagv
= dyn
.d_un
.d_val
;
3115 amt
= sizeof (struct bfd_link_needed_list
);
3116 n
= bfd_alloc (abfd
, amt
);
3117 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3118 if (n
== NULL
|| fnm
== NULL
)
3119 goto error_free_dyn
;
3120 amt
= strlen (fnm
) + 1;
3121 anm
= bfd_alloc (abfd
, amt
);
3123 goto error_free_dyn
;
3124 memcpy (anm
, fnm
, amt
);
3128 for (pn
= & hash_table
->needed
;
3134 if (dyn
.d_tag
== DT_RUNPATH
)
3136 struct bfd_link_needed_list
*n
, **pn
;
3138 unsigned int tagv
= dyn
.d_un
.d_val
;
3140 amt
= sizeof (struct bfd_link_needed_list
);
3141 n
= bfd_alloc (abfd
, amt
);
3142 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3143 if (n
== NULL
|| fnm
== NULL
)
3144 goto error_free_dyn
;
3145 amt
= strlen (fnm
) + 1;
3146 anm
= bfd_alloc (abfd
, amt
);
3148 goto error_free_dyn
;
3149 memcpy (anm
, fnm
, amt
);
3153 for (pn
= & runpath
;
3159 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3160 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3162 struct bfd_link_needed_list
*n
, **pn
;
3164 unsigned int tagv
= dyn
.d_un
.d_val
;
3166 amt
= sizeof (struct bfd_link_needed_list
);
3167 n
= bfd_alloc (abfd
, amt
);
3168 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3169 if (n
== NULL
|| fnm
== NULL
)
3170 goto error_free_dyn
;
3171 amt
= strlen (fnm
) + 1;
3172 anm
= bfd_alloc (abfd
, amt
);
3179 memcpy (anm
, fnm
, amt
);
3194 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3195 frees all more recently bfd_alloc'd blocks as well. */
3201 struct bfd_link_needed_list
**pn
;
3202 for (pn
= & hash_table
->runpath
;
3209 /* We do not want to include any of the sections in a dynamic
3210 object in the output file. We hack by simply clobbering the
3211 list of sections in the BFD. This could be handled more
3212 cleanly by, say, a new section flag; the existing
3213 SEC_NEVER_LOAD flag is not the one we want, because that one
3214 still implies that the section takes up space in the output
3216 bfd_section_list_clear (abfd
);
3218 /* If this is the first dynamic object found in the link, create
3219 the special sections required for dynamic linking. */
3220 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3223 /* Find the name to use in a DT_NEEDED entry that refers to this
3224 object. If the object has a DT_SONAME entry, we use it.
3225 Otherwise, if the generic linker stuck something in
3226 elf_dt_name, we use that. Otherwise, we just use the file
3228 if (soname
== NULL
|| *soname
== '\0')
3230 soname
= elf_dt_name (abfd
);
3231 if (soname
== NULL
|| *soname
== '\0')
3232 soname
= bfd_get_filename (abfd
);
3235 /* Save the SONAME because sometimes the linker emulation code
3236 will need to know it. */
3237 elf_dt_name (abfd
) = soname
;
3239 ret
= elf_add_dt_needed_tag (info
, soname
, add_needed
);
3243 /* If we have already included this dynamic object in the
3244 link, just ignore it. There is no reason to include a
3245 particular dynamic object more than once. */
3250 /* If this is a dynamic object, we always link against the .dynsym
3251 symbol table, not the .symtab symbol table. The dynamic linker
3252 will only see the .dynsym symbol table, so there is no reason to
3253 look at .symtab for a dynamic object. */
3255 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3256 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3258 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3260 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3262 /* The sh_info field of the symtab header tells us where the
3263 external symbols start. We don't care about the local symbols at
3265 if (elf_bad_symtab (abfd
))
3267 extsymcount
= symcount
;
3272 extsymcount
= symcount
- hdr
->sh_info
;
3273 extsymoff
= hdr
->sh_info
;
3277 if (extsymcount
!= 0)
3279 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3281 if (isymbuf
== NULL
)
3284 /* We store a pointer to the hash table entry for each external
3286 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3287 sym_hash
= bfd_alloc (abfd
, amt
);
3288 if (sym_hash
== NULL
)
3289 goto error_free_sym
;
3290 elf_sym_hashes (abfd
) = sym_hash
;
3295 /* Read in any version definitions. */
3296 if (! _bfd_elf_slurp_version_tables (abfd
))
3297 goto error_free_sym
;
3299 /* Read in the symbol versions, but don't bother to convert them
3300 to internal format. */
3301 if (elf_dynversym (abfd
) != 0)
3303 Elf_Internal_Shdr
*versymhdr
;
3305 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3306 extversym
= bfd_malloc (versymhdr
->sh_size
);
3307 if (extversym
== NULL
)
3308 goto error_free_sym
;
3309 amt
= versymhdr
->sh_size
;
3310 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3311 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3312 goto error_free_vers
;
3318 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3319 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3321 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3328 struct elf_link_hash_entry
*h
;
3329 bfd_boolean definition
;
3330 bfd_boolean size_change_ok
;
3331 bfd_boolean type_change_ok
;
3332 bfd_boolean new_weakdef
;
3333 bfd_boolean override
;
3334 unsigned int old_alignment
;
3339 flags
= BSF_NO_FLAGS
;
3341 value
= isym
->st_value
;
3344 bind
= ELF_ST_BIND (isym
->st_info
);
3345 if (bind
== STB_LOCAL
)
3347 /* This should be impossible, since ELF requires that all
3348 global symbols follow all local symbols, and that sh_info
3349 point to the first global symbol. Unfortunately, Irix 5
3353 else if (bind
== STB_GLOBAL
)
3355 if (isym
->st_shndx
!= SHN_UNDEF
3356 && isym
->st_shndx
!= SHN_COMMON
)
3359 else if (bind
== STB_WEAK
)
3363 /* Leave it up to the processor backend. */
3366 if (isym
->st_shndx
== SHN_UNDEF
)
3367 sec
= bfd_und_section_ptr
;
3368 else if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
3370 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3372 sec
= bfd_abs_section_ptr
;
3373 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3376 else if (isym
->st_shndx
== SHN_ABS
)
3377 sec
= bfd_abs_section_ptr
;
3378 else if (isym
->st_shndx
== SHN_COMMON
)
3380 sec
= bfd_com_section_ptr
;
3381 /* What ELF calls the size we call the value. What ELF
3382 calls the value we call the alignment. */
3383 value
= isym
->st_size
;
3387 /* Leave it up to the processor backend. */
3390 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3393 goto error_free_vers
;
3395 if (isym
->st_shndx
== SHN_COMMON
3396 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
3398 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3402 tcomm
= bfd_make_section (abfd
, ".tcommon");
3404 || !bfd_set_section_flags (abfd
, tcomm
, (SEC_ALLOC
3406 | SEC_LINKER_CREATED
3407 | SEC_THREAD_LOCAL
)))
3408 goto error_free_vers
;
3412 else if (add_symbol_hook
)
3414 if (! (*add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
, &sec
,
3416 goto error_free_vers
;
3418 /* The hook function sets the name to NULL if this symbol
3419 should be skipped for some reason. */
3424 /* Sanity check that all possibilities were handled. */
3427 bfd_set_error (bfd_error_bad_value
);
3428 goto error_free_vers
;
3431 if (bfd_is_und_section (sec
)
3432 || bfd_is_com_section (sec
))
3437 size_change_ok
= FALSE
;
3438 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
3442 if (is_elf_hash_table (hash_table
))
3444 Elf_Internal_Versym iver
;
3445 unsigned int vernum
= 0;
3450 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
3451 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
3453 /* If this is a hidden symbol, or if it is not version
3454 1, we append the version name to the symbol name.
3455 However, we do not modify a non-hidden absolute
3456 symbol, because it might be the version symbol
3457 itself. FIXME: What if it isn't? */
3458 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
3459 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
3462 size_t namelen
, verlen
, newlen
;
3465 if (isym
->st_shndx
!= SHN_UNDEF
)
3467 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
3469 (*_bfd_error_handler
)
3470 (_("%s: %s: invalid version %u (max %d)"),
3471 bfd_archive_filename (abfd
), name
, vernum
,
3472 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
3473 bfd_set_error (bfd_error_bad_value
);
3474 goto error_free_vers
;
3476 else if (vernum
> 1)
3478 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
3484 /* We cannot simply test for the number of
3485 entries in the VERNEED section since the
3486 numbers for the needed versions do not start
3488 Elf_Internal_Verneed
*t
;
3491 for (t
= elf_tdata (abfd
)->verref
;
3495 Elf_Internal_Vernaux
*a
;
3497 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3499 if (a
->vna_other
== vernum
)
3501 verstr
= a
->vna_nodename
;
3510 (*_bfd_error_handler
)
3511 (_("%s: %s: invalid needed version %d"),
3512 bfd_archive_filename (abfd
), name
, vernum
);
3513 bfd_set_error (bfd_error_bad_value
);
3514 goto error_free_vers
;
3518 namelen
= strlen (name
);
3519 verlen
= strlen (verstr
);
3520 newlen
= namelen
+ verlen
+ 2;
3521 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3522 && isym
->st_shndx
!= SHN_UNDEF
)
3525 newname
= bfd_alloc (abfd
, newlen
);
3526 if (newname
== NULL
)
3527 goto error_free_vers
;
3528 memcpy (newname
, name
, namelen
);
3529 p
= newname
+ namelen
;
3531 /* If this is a defined non-hidden version symbol,
3532 we add another @ to the name. This indicates the
3533 default version of the symbol. */
3534 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3535 && isym
->st_shndx
!= SHN_UNDEF
)
3537 memcpy (p
, verstr
, verlen
+ 1);
3543 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
3544 sym_hash
, &skip
, &override
,
3545 &type_change_ok
, &size_change_ok
))
3546 goto error_free_vers
;
3555 while (h
->root
.type
== bfd_link_hash_indirect
3556 || h
->root
.type
== bfd_link_hash_warning
)
3557 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3559 /* Remember the old alignment if this is a common symbol, so
3560 that we don't reduce the alignment later on. We can't
3561 check later, because _bfd_generic_link_add_one_symbol
3562 will set a default for the alignment which we want to
3563 override. We also remember the old bfd where the existing
3564 definition comes from. */
3565 switch (h
->root
.type
)
3570 case bfd_link_hash_defined
:
3571 case bfd_link_hash_defweak
:
3572 old_bfd
= h
->root
.u
.def
.section
->owner
;
3575 case bfd_link_hash_common
:
3576 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
3577 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
3581 if (elf_tdata (abfd
)->verdef
!= NULL
3585 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
3588 if (! (_bfd_generic_link_add_one_symbol
3589 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, collect
,
3590 (struct bfd_link_hash_entry
**) sym_hash
)))
3591 goto error_free_vers
;
3594 while (h
->root
.type
== bfd_link_hash_indirect
3595 || h
->root
.type
== bfd_link_hash_warning
)
3596 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3599 new_weakdef
= FALSE
;
3602 && (flags
& BSF_WEAK
) != 0
3603 && ELF_ST_TYPE (isym
->st_info
) != STT_FUNC
3604 && is_elf_hash_table (hash_table
)
3605 && h
->weakdef
== NULL
)
3607 /* Keep a list of all weak defined non function symbols from
3608 a dynamic object, using the weakdef field. Later in this
3609 function we will set the weakdef field to the correct
3610 value. We only put non-function symbols from dynamic
3611 objects on this list, because that happens to be the only
3612 time we need to know the normal symbol corresponding to a
3613 weak symbol, and the information is time consuming to
3614 figure out. If the weakdef field is not already NULL,
3615 then this symbol was already defined by some previous
3616 dynamic object, and we will be using that previous
3617 definition anyhow. */
3624 /* Set the alignment of a common symbol. */
3625 if (isym
->st_shndx
== SHN_COMMON
3626 && h
->root
.type
== bfd_link_hash_common
)
3630 align
= bfd_log2 (isym
->st_value
);
3631 if (align
> old_alignment
3632 /* Permit an alignment power of zero if an alignment of one
3633 is specified and no other alignments have been specified. */
3634 || (isym
->st_value
== 1 && old_alignment
== 0))
3635 h
->root
.u
.c
.p
->alignment_power
= align
;
3637 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
3640 if (is_elf_hash_table (hash_table
))
3646 /* Check the alignment when a common symbol is involved. This
3647 can change when a common symbol is overridden by a normal
3648 definition or a common symbol is ignored due to the old
3649 normal definition. We need to make sure the maximum
3650 alignment is maintained. */
3651 if ((old_alignment
|| isym
->st_shndx
== SHN_COMMON
)
3652 && h
->root
.type
!= bfd_link_hash_common
)
3654 unsigned int common_align
;
3655 unsigned int normal_align
;
3656 unsigned int symbol_align
;
3660 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
3661 if (h
->root
.u
.def
.section
->owner
!= NULL
3662 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3664 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
3665 if (normal_align
> symbol_align
)
3666 normal_align
= symbol_align
;
3669 normal_align
= symbol_align
;
3673 common_align
= old_alignment
;
3674 common_bfd
= old_bfd
;
3679 common_align
= bfd_log2 (isym
->st_value
);
3681 normal_bfd
= old_bfd
;
3684 if (normal_align
< common_align
)
3685 (*_bfd_error_handler
)
3686 (_("Warning: alignment %u of symbol `%s' in %s is smaller than %u in %s"),
3689 bfd_archive_filename (normal_bfd
),
3691 bfd_archive_filename (common_bfd
));
3694 /* Remember the symbol size and type. */
3695 if (isym
->st_size
!= 0
3696 && (definition
|| h
->size
== 0))
3698 if (h
->size
!= 0 && h
->size
!= isym
->st_size
&& ! size_change_ok
)
3699 (*_bfd_error_handler
)
3700 (_("Warning: size of symbol `%s' changed from %lu in %s to %lu in %s"),
3701 name
, (unsigned long) h
->size
,
3702 bfd_archive_filename (old_bfd
),
3703 (unsigned long) isym
->st_size
,
3704 bfd_archive_filename (abfd
));
3706 h
->size
= isym
->st_size
;
3709 /* If this is a common symbol, then we always want H->SIZE
3710 to be the size of the common symbol. The code just above
3711 won't fix the size if a common symbol becomes larger. We
3712 don't warn about a size change here, because that is
3713 covered by --warn-common. */
3714 if (h
->root
.type
== bfd_link_hash_common
)
3715 h
->size
= h
->root
.u
.c
.size
;
3717 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
3718 && (definition
|| h
->type
== STT_NOTYPE
))
3720 if (h
->type
!= STT_NOTYPE
3721 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
3722 && ! type_change_ok
)
3723 (*_bfd_error_handler
)
3724 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
3725 name
, h
->type
, ELF_ST_TYPE (isym
->st_info
),
3726 bfd_archive_filename (abfd
));
3728 h
->type
= ELF_ST_TYPE (isym
->st_info
);
3731 /* If st_other has a processor-specific meaning, specific
3732 code might be needed here. We never merge the visibility
3733 attribute with the one from a dynamic object. */
3734 if (bed
->elf_backend_merge_symbol_attribute
)
3735 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
3738 if (isym
->st_other
!= 0 && !dynamic
)
3740 unsigned char hvis
, symvis
, other
, nvis
;
3742 /* Take the balance of OTHER from the definition. */
3743 other
= (definition
? isym
->st_other
: h
->other
);
3744 other
&= ~ ELF_ST_VISIBILITY (-1);
3746 /* Combine visibilities, using the most constraining one. */
3747 hvis
= ELF_ST_VISIBILITY (h
->other
);
3748 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
3754 nvis
= hvis
< symvis
? hvis
: symvis
;
3756 h
->other
= other
| nvis
;
3759 /* Set a flag in the hash table entry indicating the type of
3760 reference or definition we just found. Keep a count of
3761 the number of dynamic symbols we find. A dynamic symbol
3762 is one which is referenced or defined by both a regular
3763 object and a shared object. */
3764 old_flags
= h
->elf_link_hash_flags
;
3770 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
3771 if (bind
!= STB_WEAK
)
3772 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3775 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
3776 if (! info
->executable
3777 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
3778 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
3784 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
3786 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
3787 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
3788 | ELF_LINK_HASH_REF_REGULAR
)) != 0
3789 || (h
->weakdef
!= NULL
3791 && h
->weakdef
->dynindx
!= -1))
3795 h
->elf_link_hash_flags
|= new_flag
;
3797 /* Check to see if we need to add an indirect symbol for
3798 the default name. */
3799 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
3800 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
3801 &sec
, &value
, &dynsym
,
3803 goto error_free_vers
;
3805 if (definition
&& !dynamic
)
3807 char *p
= strchr (name
, ELF_VER_CHR
);
3808 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
3810 /* Queue non-default versions so that .symver x, x@FOO
3811 aliases can be checked. */
3812 if (! nondeflt_vers
)
3814 amt
= (isymend
- isym
+ 1)
3815 * sizeof (struct elf_link_hash_entry
*);
3816 nondeflt_vers
= bfd_malloc (amt
);
3818 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
3822 if (dynsym
&& h
->dynindx
== -1)
3824 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3825 goto error_free_vers
;
3826 if (h
->weakdef
!= NULL
3828 && h
->weakdef
->dynindx
== -1)
3830 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
3831 goto error_free_vers
;
3834 else if (dynsym
&& h
->dynindx
!= -1)
3835 /* If the symbol already has a dynamic index, but
3836 visibility says it should not be visible, turn it into
3838 switch (ELF_ST_VISIBILITY (h
->other
))
3842 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
3850 && (h
->elf_link_hash_flags
3851 & ELF_LINK_HASH_REF_REGULAR
) != 0)
3854 const char *soname
= elf_dt_name (abfd
);
3856 /* A symbol from a library loaded via DT_NEEDED of some
3857 other library is referenced by a regular object.
3858 Add a DT_NEEDED entry for it. Issue an error if
3859 --no-add-needed is used. */
3860 if ((elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
3862 (*_bfd_error_handler
)
3863 (_("%s: invalid DSO for symbol `%s' definition"),
3864 bfd_archive_filename (abfd
), name
);
3865 bfd_set_error (bfd_error_bad_value
);
3866 goto error_free_vers
;
3870 ret
= elf_add_dt_needed_tag (info
, soname
, add_needed
);
3872 goto error_free_vers
;
3874 BFD_ASSERT (ret
== 0);
3879 /* Now that all the symbols from this input file are created, handle
3880 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
3881 if (nondeflt_vers
!= NULL
)
3883 bfd_size_type cnt
, symidx
;
3885 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
3887 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
3888 char *shortname
, *p
;
3890 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3892 || (h
->root
.type
!= bfd_link_hash_defined
3893 && h
->root
.type
!= bfd_link_hash_defweak
))
3896 amt
= p
- h
->root
.root
.string
;
3897 shortname
= bfd_malloc (amt
+ 1);
3898 memcpy (shortname
, h
->root
.root
.string
, amt
);
3899 shortname
[amt
] = '\0';
3901 hi
= (struct elf_link_hash_entry
*)
3902 bfd_link_hash_lookup (&hash_table
->root
, shortname
,
3903 FALSE
, FALSE
, FALSE
);
3905 && hi
->root
.type
== h
->root
.type
3906 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
3907 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
3909 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
3910 hi
->root
.type
= bfd_link_hash_indirect
;
3911 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
3912 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
3913 sym_hash
= elf_sym_hashes (abfd
);
3915 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
3916 if (sym_hash
[symidx
] == hi
)
3918 sym_hash
[symidx
] = h
;
3924 free (nondeflt_vers
);
3925 nondeflt_vers
= NULL
;
3928 if (extversym
!= NULL
)
3934 if (isymbuf
!= NULL
)
3938 /* Now set the weakdefs field correctly for all the weak defined
3939 symbols we found. The only way to do this is to search all the
3940 symbols. Since we only need the information for non functions in
3941 dynamic objects, that's the only time we actually put anything on
3942 the list WEAKS. We need this information so that if a regular
3943 object refers to a symbol defined weakly in a dynamic object, the
3944 real symbol in the dynamic object is also put in the dynamic
3945 symbols; we also must arrange for both symbols to point to the
3946 same memory location. We could handle the general case of symbol
3947 aliasing, but a general symbol alias can only be generated in
3948 assembler code, handling it correctly would be very time
3949 consuming, and other ELF linkers don't handle general aliasing
3953 struct elf_link_hash_entry
**hpp
;
3954 struct elf_link_hash_entry
**hppend
;
3955 struct elf_link_hash_entry
**sorted_sym_hash
;
3956 struct elf_link_hash_entry
*h
;
3959 /* Since we have to search the whole symbol list for each weak
3960 defined symbol, search time for N weak defined symbols will be
3961 O(N^2). Binary search will cut it down to O(NlogN). */
3962 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3963 sorted_sym_hash
= bfd_malloc (amt
);
3964 if (sorted_sym_hash
== NULL
)
3966 sym_hash
= sorted_sym_hash
;
3967 hpp
= elf_sym_hashes (abfd
);
3968 hppend
= hpp
+ extsymcount
;
3970 for (; hpp
< hppend
; hpp
++)
3974 && h
->root
.type
== bfd_link_hash_defined
3975 && h
->type
!= STT_FUNC
)
3983 qsort (sorted_sym_hash
, sym_count
,
3984 sizeof (struct elf_link_hash_entry
*),
3987 while (weaks
!= NULL
)
3989 struct elf_link_hash_entry
*hlook
;
3996 weaks
= hlook
->weakdef
;
3997 hlook
->weakdef
= NULL
;
3999 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4000 || hlook
->root
.type
== bfd_link_hash_defweak
4001 || hlook
->root
.type
== bfd_link_hash_common
4002 || hlook
->root
.type
== bfd_link_hash_indirect
);
4003 slook
= hlook
->root
.u
.def
.section
;
4004 vlook
= hlook
->root
.u
.def
.value
;
4011 bfd_signed_vma vdiff
;
4013 h
= sorted_sym_hash
[idx
];
4014 vdiff
= vlook
- h
->root
.u
.def
.value
;
4021 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4034 /* We didn't find a value/section match. */
4038 for (i
= ilook
; i
< sym_count
; i
++)
4040 h
= sorted_sym_hash
[i
];
4042 /* Stop if value or section doesn't match. */
4043 if (h
->root
.u
.def
.value
!= vlook
4044 || h
->root
.u
.def
.section
!= slook
)
4046 else if (h
!= hlook
)
4050 /* If the weak definition is in the list of dynamic
4051 symbols, make sure the real definition is put
4053 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4055 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4059 /* If the real definition is in the list of dynamic
4060 symbols, make sure the weak definition is put
4061 there as well. If we don't do this, then the
4062 dynamic loader might not merge the entries for the
4063 real definition and the weak definition. */
4064 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4066 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4074 free (sorted_sym_hash
);
4077 check_directives
= get_elf_backend_data (abfd
)->check_directives
;
4078 if (check_directives
)
4079 check_directives (abfd
, info
);
4081 /* If this object is the same format as the output object, and it is
4082 not a shared library, then let the backend look through the
4085 This is required to build global offset table entries and to
4086 arrange for dynamic relocs. It is not required for the
4087 particular common case of linking non PIC code, even when linking
4088 against shared libraries, but unfortunately there is no way of
4089 knowing whether an object file has been compiled PIC or not.
4090 Looking through the relocs is not particularly time consuming.
4091 The problem is that we must either (1) keep the relocs in memory,
4092 which causes the linker to require additional runtime memory or
4093 (2) read the relocs twice from the input file, which wastes time.
4094 This would be a good case for using mmap.
4096 I have no idea how to handle linking PIC code into a file of a
4097 different format. It probably can't be done. */
4098 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
4100 && is_elf_hash_table (hash_table
)
4101 && hash_table
->root
.creator
== abfd
->xvec
4102 && check_relocs
!= NULL
)
4106 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4108 Elf_Internal_Rela
*internal_relocs
;
4111 if ((o
->flags
& SEC_RELOC
) == 0
4112 || o
->reloc_count
== 0
4113 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4114 && (o
->flags
& SEC_DEBUGGING
) != 0)
4115 || bfd_is_abs_section (o
->output_section
))
4118 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4120 if (internal_relocs
== NULL
)
4123 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
4125 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4126 free (internal_relocs
);
4133 /* If this is a non-traditional link, try to optimize the handling
4134 of the .stab/.stabstr sections. */
4136 && ! info
->traditional_format
4137 && is_elf_hash_table (hash_table
)
4138 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4142 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4143 if (stabstr
!= NULL
)
4145 bfd_size_type string_offset
= 0;
4148 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4149 if (strncmp (".stab", stab
->name
, 5) == 0
4150 && (!stab
->name
[5] ||
4151 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4152 && (stab
->flags
& SEC_MERGE
) == 0
4153 && !bfd_is_abs_section (stab
->output_section
))
4155 struct bfd_elf_section_data
*secdata
;
4157 secdata
= elf_section_data (stab
);
4158 if (! _bfd_link_section_stabs (abfd
,
4159 &hash_table
->stab_info
,
4164 if (secdata
->sec_info
)
4165 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4170 if (is_elf_hash_table (hash_table
))
4172 /* Add this bfd to the loaded list. */
4173 struct elf_link_loaded_list
*n
;
4175 n
= bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4179 n
->next
= hash_table
->loaded
;
4180 hash_table
->loaded
= n
;
4186 if (nondeflt_vers
!= NULL
)
4187 free (nondeflt_vers
);
4188 if (extversym
!= NULL
)
4191 if (isymbuf
!= NULL
)
4197 /* Return the linker hash table entry of a symbol that might be
4198 satisfied by an archive symbol. Return -1 on error. */
4200 struct elf_link_hash_entry
*
4201 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4202 struct bfd_link_info
*info
,
4205 struct elf_link_hash_entry
*h
;
4209 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4213 /* If this is a default version (the name contains @@), look up the
4214 symbol again with only one `@' as well as without the version.
4215 The effect is that references to the symbol with and without the
4216 version will be matched by the default symbol in the archive. */
4218 p
= strchr (name
, ELF_VER_CHR
);
4219 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4222 /* First check with only one `@'. */
4223 len
= strlen (name
);
4224 copy
= bfd_alloc (abfd
, len
);
4226 return (struct elf_link_hash_entry
*) 0 - 1;
4228 first
= p
- name
+ 1;
4229 memcpy (copy
, name
, first
);
4230 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4232 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4235 /* We also need to check references to the symbol without the
4237 copy
[first
- 1] = '\0';
4238 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4239 FALSE
, FALSE
, FALSE
);
4242 bfd_release (abfd
, copy
);
4246 /* Add symbols from an ELF archive file to the linker hash table. We
4247 don't use _bfd_generic_link_add_archive_symbols because of a
4248 problem which arises on UnixWare. The UnixWare libc.so is an
4249 archive which includes an entry libc.so.1 which defines a bunch of
4250 symbols. The libc.so archive also includes a number of other
4251 object files, which also define symbols, some of which are the same
4252 as those defined in libc.so.1. Correct linking requires that we
4253 consider each object file in turn, and include it if it defines any
4254 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4255 this; it looks through the list of undefined symbols, and includes
4256 any object file which defines them. When this algorithm is used on
4257 UnixWare, it winds up pulling in libc.so.1 early and defining a
4258 bunch of symbols. This means that some of the other objects in the
4259 archive are not included in the link, which is incorrect since they
4260 precede libc.so.1 in the archive.
4262 Fortunately, ELF archive handling is simpler than that done by
4263 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4264 oddities. In ELF, if we find a symbol in the archive map, and the
4265 symbol is currently undefined, we know that we must pull in that
4268 Unfortunately, we do have to make multiple passes over the symbol
4269 table until nothing further is resolved. */
4272 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4275 bfd_boolean
*defined
= NULL
;
4276 bfd_boolean
*included
= NULL
;
4280 const struct elf_backend_data
*bed
;
4281 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4282 (bfd
*, struct bfd_link_info
*, const char *);
4284 if (! bfd_has_map (abfd
))
4286 /* An empty archive is a special case. */
4287 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4289 bfd_set_error (bfd_error_no_armap
);
4293 /* Keep track of all symbols we know to be already defined, and all
4294 files we know to be already included. This is to speed up the
4295 second and subsequent passes. */
4296 c
= bfd_ardata (abfd
)->symdef_count
;
4300 amt
*= sizeof (bfd_boolean
);
4301 defined
= bfd_zmalloc (amt
);
4302 included
= bfd_zmalloc (amt
);
4303 if (defined
== NULL
|| included
== NULL
)
4306 symdefs
= bfd_ardata (abfd
)->symdefs
;
4307 bed
= get_elf_backend_data (abfd
);
4308 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
4321 symdefend
= symdef
+ c
;
4322 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
4324 struct elf_link_hash_entry
*h
;
4326 struct bfd_link_hash_entry
*undefs_tail
;
4329 if (defined
[i
] || included
[i
])
4331 if (symdef
->file_offset
== last
)
4337 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
4338 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
4344 if (h
->root
.type
== bfd_link_hash_common
)
4346 /* We currently have a common symbol. The archive map contains
4347 a reference to this symbol, so we may want to include it. We
4348 only want to include it however, if this archive element
4349 contains a definition of the symbol, not just another common
4352 Unfortunately some archivers (including GNU ar) will put
4353 declarations of common symbols into their archive maps, as
4354 well as real definitions, so we cannot just go by the archive
4355 map alone. Instead we must read in the element's symbol
4356 table and check that to see what kind of symbol definition
4358 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
4361 else if (h
->root
.type
!= bfd_link_hash_undefined
)
4363 if (h
->root
.type
!= bfd_link_hash_undefweak
)
4368 /* We need to include this archive member. */
4369 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
4370 if (element
== NULL
)
4373 if (! bfd_check_format (element
, bfd_object
))
4376 /* Doublecheck that we have not included this object
4377 already--it should be impossible, but there may be
4378 something wrong with the archive. */
4379 if (element
->archive_pass
!= 0)
4381 bfd_set_error (bfd_error_bad_value
);
4384 element
->archive_pass
= 1;
4386 undefs_tail
= info
->hash
->undefs_tail
;
4388 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
4391 if (! bfd_link_add_symbols (element
, info
))
4394 /* If there are any new undefined symbols, we need to make
4395 another pass through the archive in order to see whether
4396 they can be defined. FIXME: This isn't perfect, because
4397 common symbols wind up on undefs_tail and because an
4398 undefined symbol which is defined later on in this pass
4399 does not require another pass. This isn't a bug, but it
4400 does make the code less efficient than it could be. */
4401 if (undefs_tail
!= info
->hash
->undefs_tail
)
4404 /* Look backward to mark all symbols from this object file
4405 which we have already seen in this pass. */
4409 included
[mark
] = TRUE
;
4414 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
4416 /* We mark subsequent symbols from this object file as we go
4417 on through the loop. */
4418 last
= symdef
->file_offset
;
4429 if (defined
!= NULL
)
4431 if (included
!= NULL
)
4436 /* Given an ELF BFD, add symbols to the global hash table as
4440 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4442 switch (bfd_get_format (abfd
))
4445 return elf_link_add_object_symbols (abfd
, info
);
4447 return elf_link_add_archive_symbols (abfd
, info
);
4449 bfd_set_error (bfd_error_wrong_format
);
4454 /* This function will be called though elf_link_hash_traverse to store
4455 all hash value of the exported symbols in an array. */
4458 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
4460 unsigned long **valuep
= data
;
4466 if (h
->root
.type
== bfd_link_hash_warning
)
4467 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4469 /* Ignore indirect symbols. These are added by the versioning code. */
4470 if (h
->dynindx
== -1)
4473 name
= h
->root
.root
.string
;
4474 p
= strchr (name
, ELF_VER_CHR
);
4477 alc
= bfd_malloc (p
- name
+ 1);
4478 memcpy (alc
, name
, p
- name
);
4479 alc
[p
- name
] = '\0';
4483 /* Compute the hash value. */
4484 ha
= bfd_elf_hash (name
);
4486 /* Store the found hash value in the array given as the argument. */
4489 /* And store it in the struct so that we can put it in the hash table
4491 h
->elf_hash_value
= ha
;
4499 /* Array used to determine the number of hash table buckets to use
4500 based on the number of symbols there are. If there are fewer than
4501 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
4502 fewer than 37 we use 17 buckets, and so forth. We never use more
4503 than 32771 buckets. */
4505 static const size_t elf_buckets
[] =
4507 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
4511 /* Compute bucket count for hashing table. We do not use a static set
4512 of possible tables sizes anymore. Instead we determine for all
4513 possible reasonable sizes of the table the outcome (i.e., the
4514 number of collisions etc) and choose the best solution. The
4515 weighting functions are not too simple to allow the table to grow
4516 without bounds. Instead one of the weighting factors is the size.
4517 Therefore the result is always a good payoff between few collisions
4518 (= short chain lengths) and table size. */
4520 compute_bucket_count (struct bfd_link_info
*info
)
4522 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
4523 size_t best_size
= 0;
4524 unsigned long int *hashcodes
;
4525 unsigned long int *hashcodesp
;
4526 unsigned long int i
;
4529 /* Compute the hash values for all exported symbols. At the same
4530 time store the values in an array so that we could use them for
4533 amt
*= sizeof (unsigned long int);
4534 hashcodes
= bfd_malloc (amt
);
4535 if (hashcodes
== NULL
)
4537 hashcodesp
= hashcodes
;
4539 /* Put all hash values in HASHCODES. */
4540 elf_link_hash_traverse (elf_hash_table (info
),
4541 elf_collect_hash_codes
, &hashcodesp
);
4543 /* We have a problem here. The following code to optimize the table
4544 size requires an integer type with more the 32 bits. If
4545 BFD_HOST_U_64_BIT is set we know about such a type. */
4546 #ifdef BFD_HOST_U_64_BIT
4549 unsigned long int nsyms
= hashcodesp
- hashcodes
;
4552 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
4553 unsigned long int *counts
;
4554 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4555 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
4557 /* Possible optimization parameters: if we have NSYMS symbols we say
4558 that the hashing table must at least have NSYMS/4 and at most
4560 minsize
= nsyms
/ 4;
4563 best_size
= maxsize
= nsyms
* 2;
4565 /* Create array where we count the collisions in. We must use bfd_malloc
4566 since the size could be large. */
4568 amt
*= sizeof (unsigned long int);
4569 counts
= bfd_malloc (amt
);
4576 /* Compute the "optimal" size for the hash table. The criteria is a
4577 minimal chain length. The minor criteria is (of course) the size
4579 for (i
= minsize
; i
< maxsize
; ++i
)
4581 /* Walk through the array of hashcodes and count the collisions. */
4582 BFD_HOST_U_64_BIT max
;
4583 unsigned long int j
;
4584 unsigned long int fact
;
4586 memset (counts
, '\0', i
* sizeof (unsigned long int));
4588 /* Determine how often each hash bucket is used. */
4589 for (j
= 0; j
< nsyms
; ++j
)
4590 ++counts
[hashcodes
[j
] % i
];
4592 /* For the weight function we need some information about the
4593 pagesize on the target. This is information need not be 100%
4594 accurate. Since this information is not available (so far) we
4595 define it here to a reasonable default value. If it is crucial
4596 to have a better value some day simply define this value. */
4597 # ifndef BFD_TARGET_PAGESIZE
4598 # define BFD_TARGET_PAGESIZE (4096)
4601 /* We in any case need 2 + NSYMS entries for the size values and
4603 max
= (2 + nsyms
) * (bed
->s
->arch_size
/ 8);
4606 /* Variant 1: optimize for short chains. We add the squares
4607 of all the chain lengths (which favors many small chain
4608 over a few long chains). */
4609 for (j
= 0; j
< i
; ++j
)
4610 max
+= counts
[j
] * counts
[j
];
4612 /* This adds penalties for the overall size of the table. */
4613 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4616 /* Variant 2: Optimize a lot more for small table. Here we
4617 also add squares of the size but we also add penalties for
4618 empty slots (the +1 term). */
4619 for (j
= 0; j
< i
; ++j
)
4620 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
4622 /* The overall size of the table is considered, but not as
4623 strong as in variant 1, where it is squared. */
4624 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4628 /* Compare with current best results. */
4629 if (max
< best_chlen
)
4639 #endif /* defined (BFD_HOST_U_64_BIT) */
4641 /* This is the fallback solution if no 64bit type is available or if we
4642 are not supposed to spend much time on optimizations. We select the
4643 bucket count using a fixed set of numbers. */
4644 for (i
= 0; elf_buckets
[i
] != 0; i
++)
4646 best_size
= elf_buckets
[i
];
4647 if (dynsymcount
< elf_buckets
[i
+ 1])
4652 /* Free the arrays we needed. */
4658 /* Set up the sizes and contents of the ELF dynamic sections. This is
4659 called by the ELF linker emulation before_allocation routine. We
4660 must set the sizes of the sections before the linker sets the
4661 addresses of the various sections. */
4664 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
4667 const char *filter_shlib
,
4668 const char * const *auxiliary_filters
,
4669 struct bfd_link_info
*info
,
4670 asection
**sinterpptr
,
4671 struct bfd_elf_version_tree
*verdefs
)
4673 bfd_size_type soname_indx
;
4675 const struct elf_backend_data
*bed
;
4676 struct elf_assign_sym_version_info asvinfo
;
4680 soname_indx
= (bfd_size_type
) -1;
4682 if (!is_elf_hash_table (info
->hash
))
4685 elf_tdata (output_bfd
)->relro
= info
->relro
;
4686 if (info
->execstack
)
4687 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
4688 else if (info
->noexecstack
)
4689 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
4693 asection
*notesec
= NULL
;
4696 for (inputobj
= info
->input_bfds
;
4698 inputobj
= inputobj
->link_next
)
4702 if (inputobj
->flags
& DYNAMIC
)
4704 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
4707 if (s
->flags
& SEC_CODE
)
4716 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
4717 if (exec
&& info
->relocatable
4718 && notesec
->output_section
!= bfd_abs_section_ptr
)
4719 notesec
->output_section
->flags
|= SEC_CODE
;
4723 /* Any syms created from now on start with -1 in
4724 got.refcount/offset and plt.refcount/offset. */
4725 elf_hash_table (info
)->init_refcount
= elf_hash_table (info
)->init_offset
;
4727 /* The backend may have to create some sections regardless of whether
4728 we're dynamic or not. */
4729 bed
= get_elf_backend_data (output_bfd
);
4730 if (bed
->elf_backend_always_size_sections
4731 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
4734 dynobj
= elf_hash_table (info
)->dynobj
;
4736 /* If there were no dynamic objects in the link, there is nothing to
4741 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
4744 if (elf_hash_table (info
)->dynamic_sections_created
)
4746 struct elf_info_failed eif
;
4747 struct elf_link_hash_entry
*h
;
4749 struct bfd_elf_version_tree
*t
;
4750 struct bfd_elf_version_expr
*d
;
4751 bfd_boolean all_defined
;
4753 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
4754 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
4758 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4760 if (soname_indx
== (bfd_size_type
) -1
4761 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
4767 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
4769 info
->flags
|= DF_SYMBOLIC
;
4776 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
4778 if (indx
== (bfd_size_type
) -1
4779 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
4782 if (info
->new_dtags
)
4784 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
4785 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
4790 if (filter_shlib
!= NULL
)
4794 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4795 filter_shlib
, TRUE
);
4796 if (indx
== (bfd_size_type
) -1
4797 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
4801 if (auxiliary_filters
!= NULL
)
4803 const char * const *p
;
4805 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
4809 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4811 if (indx
== (bfd_size_type
) -1
4812 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
4818 eif
.verdefs
= verdefs
;
4821 /* If we are supposed to export all symbols into the dynamic symbol
4822 table (this is not the normal case), then do so. */
4823 if (info
->export_dynamic
)
4825 elf_link_hash_traverse (elf_hash_table (info
),
4826 _bfd_elf_export_symbol
,
4832 /* Make all global versions with definition. */
4833 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
4834 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
4835 if (!d
->symver
&& d
->symbol
)
4837 const char *verstr
, *name
;
4838 size_t namelen
, verlen
, newlen
;
4840 struct elf_link_hash_entry
*newh
;
4843 namelen
= strlen (name
);
4845 verlen
= strlen (verstr
);
4846 newlen
= namelen
+ verlen
+ 3;
4848 newname
= bfd_malloc (newlen
);
4849 if (newname
== NULL
)
4851 memcpy (newname
, name
, namelen
);
4853 /* Check the hidden versioned definition. */
4854 p
= newname
+ namelen
;
4856 memcpy (p
, verstr
, verlen
+ 1);
4857 newh
= elf_link_hash_lookup (elf_hash_table (info
),
4858 newname
, FALSE
, FALSE
,
4861 || (newh
->root
.type
!= bfd_link_hash_defined
4862 && newh
->root
.type
!= bfd_link_hash_defweak
))
4864 /* Check the default versioned definition. */
4866 memcpy (p
, verstr
, verlen
+ 1);
4867 newh
= elf_link_hash_lookup (elf_hash_table (info
),
4868 newname
, FALSE
, FALSE
,
4873 /* Mark this version if there is a definition and it is
4874 not defined in a shared object. */
4876 && ((newh
->elf_link_hash_flags
4877 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)
4878 && (newh
->root
.type
== bfd_link_hash_defined
4879 || newh
->root
.type
== bfd_link_hash_defweak
))
4883 /* Attach all the symbols to their version information. */
4884 asvinfo
.output_bfd
= output_bfd
;
4885 asvinfo
.info
= info
;
4886 asvinfo
.verdefs
= verdefs
;
4887 asvinfo
.failed
= FALSE
;
4889 elf_link_hash_traverse (elf_hash_table (info
),
4890 _bfd_elf_link_assign_sym_version
,
4895 if (!info
->allow_undefined_version
)
4897 /* Check if all global versions have a definition. */
4899 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
4900 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
4901 if (!d
->symver
&& !d
->script
)
4903 (*_bfd_error_handler
)
4904 (_("%s: undefined version: %s"),
4905 d
->pattern
, t
->name
);
4906 all_defined
= FALSE
;
4911 bfd_set_error (bfd_error_bad_value
);
4916 /* Find all symbols which were defined in a dynamic object and make
4917 the backend pick a reasonable value for them. */
4918 elf_link_hash_traverse (elf_hash_table (info
),
4919 _bfd_elf_adjust_dynamic_symbol
,
4924 /* Add some entries to the .dynamic section. We fill in some of the
4925 values later, in elf_bfd_final_link, but we must add the entries
4926 now so that we know the final size of the .dynamic section. */
4928 /* If there are initialization and/or finalization functions to
4929 call then add the corresponding DT_INIT/DT_FINI entries. */
4930 h
= (info
->init_function
4931 ? elf_link_hash_lookup (elf_hash_table (info
),
4932 info
->init_function
, FALSE
,
4936 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
4937 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
4939 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
4942 h
= (info
->fini_function
4943 ? elf_link_hash_lookup (elf_hash_table (info
),
4944 info
->fini_function
, FALSE
,
4948 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
4949 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
4951 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
4955 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
4957 /* DT_PREINIT_ARRAY is not allowed in shared library. */
4958 if (! info
->executable
)
4963 for (sub
= info
->input_bfds
; sub
!= NULL
;
4964 sub
= sub
->link_next
)
4965 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4966 if (elf_section_data (o
)->this_hdr
.sh_type
4967 == SHT_PREINIT_ARRAY
)
4969 (*_bfd_error_handler
)
4970 (_("%s: .preinit_array section is not allowed in DSO"),
4971 bfd_archive_filename (sub
));
4975 bfd_set_error (bfd_error_nonrepresentable_section
);
4979 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
4980 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
4983 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
4985 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
4986 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
4989 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
4991 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
4992 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
4996 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
4997 /* If .dynstr is excluded from the link, we don't want any of
4998 these tags. Strictly, we should be checking each section
4999 individually; This quick check covers for the case where
5000 someone does a /DISCARD/ : { *(*) }. */
5001 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5003 bfd_size_type strsize
;
5005 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5006 if (!_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0)
5007 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5008 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5009 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5010 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5011 bed
->s
->sizeof_sym
))
5016 /* The backend must work out the sizes of all the other dynamic
5018 if (bed
->elf_backend_size_dynamic_sections
5019 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5022 if (elf_hash_table (info
)->dynamic_sections_created
)
5024 bfd_size_type dynsymcount
;
5026 size_t bucketcount
= 0;
5027 size_t hash_entry_size
;
5028 unsigned int dtagcount
;
5030 /* Set up the version definition section. */
5031 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5032 BFD_ASSERT (s
!= NULL
);
5034 /* We may have created additional version definitions if we are
5035 just linking a regular application. */
5036 verdefs
= asvinfo
.verdefs
;
5038 /* Skip anonymous version tag. */
5039 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5040 verdefs
= verdefs
->next
;
5042 if (verdefs
== NULL
)
5043 _bfd_strip_section_from_output (info
, s
);
5048 struct bfd_elf_version_tree
*t
;
5050 Elf_Internal_Verdef def
;
5051 Elf_Internal_Verdaux defaux
;
5056 /* Make space for the base version. */
5057 size
+= sizeof (Elf_External_Verdef
);
5058 size
+= sizeof (Elf_External_Verdaux
);
5061 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5063 struct bfd_elf_version_deps
*n
;
5065 size
+= sizeof (Elf_External_Verdef
);
5066 size
+= sizeof (Elf_External_Verdaux
);
5069 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5070 size
+= sizeof (Elf_External_Verdaux
);
5074 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5075 if (s
->contents
== NULL
&& s
->size
!= 0)
5078 /* Fill in the version definition section. */
5082 def
.vd_version
= VER_DEF_CURRENT
;
5083 def
.vd_flags
= VER_FLG_BASE
;
5086 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5087 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5088 + sizeof (Elf_External_Verdaux
));
5090 if (soname_indx
!= (bfd_size_type
) -1)
5092 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5094 def
.vd_hash
= bfd_elf_hash (soname
);
5095 defaux
.vda_name
= soname_indx
;
5102 name
= basename (output_bfd
->filename
);
5103 def
.vd_hash
= bfd_elf_hash (name
);
5104 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5106 if (indx
== (bfd_size_type
) -1)
5108 defaux
.vda_name
= indx
;
5110 defaux
.vda_next
= 0;
5112 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5113 (Elf_External_Verdef
*) p
);
5114 p
+= sizeof (Elf_External_Verdef
);
5115 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5116 (Elf_External_Verdaux
*) p
);
5117 p
+= sizeof (Elf_External_Verdaux
);
5119 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5122 struct bfd_elf_version_deps
*n
;
5123 struct elf_link_hash_entry
*h
;
5124 struct bfd_link_hash_entry
*bh
;
5127 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5130 /* Add a symbol representing this version. */
5132 if (! (_bfd_generic_link_add_one_symbol
5133 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5135 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5137 h
= (struct elf_link_hash_entry
*) bh
;
5138 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
5139 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
5140 h
->type
= STT_OBJECT
;
5141 h
->verinfo
.vertree
= t
;
5143 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5146 def
.vd_version
= VER_DEF_CURRENT
;
5148 if (t
->globals
.list
== NULL
5149 && t
->locals
.list
== NULL
5151 def
.vd_flags
|= VER_FLG_WEAK
;
5152 def
.vd_ndx
= t
->vernum
+ 1;
5153 def
.vd_cnt
= cdeps
+ 1;
5154 def
.vd_hash
= bfd_elf_hash (t
->name
);
5155 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5157 if (t
->next
!= NULL
)
5158 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5159 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
5161 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5162 (Elf_External_Verdef
*) p
);
5163 p
+= sizeof (Elf_External_Verdef
);
5165 defaux
.vda_name
= h
->dynstr_index
;
5166 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5168 defaux
.vda_next
= 0;
5169 if (t
->deps
!= NULL
)
5170 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5171 t
->name_indx
= defaux
.vda_name
;
5173 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5174 (Elf_External_Verdaux
*) p
);
5175 p
+= sizeof (Elf_External_Verdaux
);
5177 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5179 if (n
->version_needed
== NULL
)
5181 /* This can happen if there was an error in the
5183 defaux
.vda_name
= 0;
5187 defaux
.vda_name
= n
->version_needed
->name_indx
;
5188 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5191 if (n
->next
== NULL
)
5192 defaux
.vda_next
= 0;
5194 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5196 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5197 (Elf_External_Verdaux
*) p
);
5198 p
+= sizeof (Elf_External_Verdaux
);
5202 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
5203 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
5206 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
5209 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
5211 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
5214 else if (info
->flags
& DF_BIND_NOW
)
5216 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
5222 if (info
->executable
)
5223 info
->flags_1
&= ~ (DF_1_INITFIRST
5226 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
5230 /* Work out the size of the version reference section. */
5232 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
5233 BFD_ASSERT (s
!= NULL
);
5235 struct elf_find_verdep_info sinfo
;
5237 sinfo
.output_bfd
= output_bfd
;
5239 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
5240 if (sinfo
.vers
== 0)
5242 sinfo
.failed
= FALSE
;
5244 elf_link_hash_traverse (elf_hash_table (info
),
5245 _bfd_elf_link_find_version_dependencies
,
5248 if (elf_tdata (output_bfd
)->verref
== NULL
)
5249 _bfd_strip_section_from_output (info
, s
);
5252 Elf_Internal_Verneed
*t
;
5257 /* Build the version definition section. */
5260 for (t
= elf_tdata (output_bfd
)->verref
;
5264 Elf_Internal_Vernaux
*a
;
5266 size
+= sizeof (Elf_External_Verneed
);
5268 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5269 size
+= sizeof (Elf_External_Vernaux
);
5273 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5274 if (s
->contents
== NULL
)
5278 for (t
= elf_tdata (output_bfd
)->verref
;
5283 Elf_Internal_Vernaux
*a
;
5287 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5290 t
->vn_version
= VER_NEED_CURRENT
;
5292 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5293 elf_dt_name (t
->vn_bfd
) != NULL
5294 ? elf_dt_name (t
->vn_bfd
)
5295 : basename (t
->vn_bfd
->filename
),
5297 if (indx
== (bfd_size_type
) -1)
5300 t
->vn_aux
= sizeof (Elf_External_Verneed
);
5301 if (t
->vn_nextref
== NULL
)
5304 t
->vn_next
= (sizeof (Elf_External_Verneed
)
5305 + caux
* sizeof (Elf_External_Vernaux
));
5307 _bfd_elf_swap_verneed_out (output_bfd
, t
,
5308 (Elf_External_Verneed
*) p
);
5309 p
+= sizeof (Elf_External_Verneed
);
5311 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5313 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
5314 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5315 a
->vna_nodename
, FALSE
);
5316 if (indx
== (bfd_size_type
) -1)
5319 if (a
->vna_nextptr
== NULL
)
5322 a
->vna_next
= sizeof (Elf_External_Vernaux
);
5324 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
5325 (Elf_External_Vernaux
*) p
);
5326 p
+= sizeof (Elf_External_Vernaux
);
5330 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
5331 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
5334 elf_tdata (output_bfd
)->cverrefs
= crefs
;
5338 /* Assign dynsym indicies. In a shared library we generate a
5339 section symbol for each output section, which come first.
5340 Next come all of the back-end allocated local dynamic syms,
5341 followed by the rest of the global symbols. */
5343 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5345 /* Work out the size of the symbol version section. */
5346 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
5347 BFD_ASSERT (s
!= NULL
);
5348 if (dynsymcount
== 0
5349 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
5351 _bfd_strip_section_from_output (info
, s
);
5352 /* The DYNSYMCOUNT might have changed if we were going to
5353 output a dynamic symbol table entry for S. */
5354 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5358 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
5359 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
5360 if (s
->contents
== NULL
)
5363 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
5367 /* Set the size of the .dynsym and .hash sections. We counted
5368 the number of dynamic symbols in elf_link_add_object_symbols.
5369 We will build the contents of .dynsym and .hash when we build
5370 the final symbol table, because until then we do not know the
5371 correct value to give the symbols. We built the .dynstr
5372 section as we went along in elf_link_add_object_symbols. */
5373 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
5374 BFD_ASSERT (s
!= NULL
);
5375 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
5376 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5377 if (s
->contents
== NULL
&& s
->size
!= 0)
5380 if (dynsymcount
!= 0)
5382 Elf_Internal_Sym isym
;
5384 /* The first entry in .dynsym is a dummy symbol. */
5391 bed
->s
->swap_symbol_out (output_bfd
, &isym
, s
->contents
, 0);
5394 /* Compute the size of the hashing table. As a side effect this
5395 computes the hash values for all the names we export. */
5396 bucketcount
= compute_bucket_count (info
);
5398 s
= bfd_get_section_by_name (dynobj
, ".hash");
5399 BFD_ASSERT (s
!= NULL
);
5400 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
5401 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
5402 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
5403 if (s
->contents
== NULL
)
5406 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
5407 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
5408 s
->contents
+ hash_entry_size
);
5410 elf_hash_table (info
)->bucketcount
= bucketcount
;
5412 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
5413 BFD_ASSERT (s
!= NULL
);
5415 elf_finalize_dynstr (output_bfd
, info
);
5417 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5419 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
5420 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
5427 /* Final phase of ELF linker. */
5429 /* A structure we use to avoid passing large numbers of arguments. */
5431 struct elf_final_link_info
5433 /* General link information. */
5434 struct bfd_link_info
*info
;
5437 /* Symbol string table. */
5438 struct bfd_strtab_hash
*symstrtab
;
5439 /* .dynsym section. */
5440 asection
*dynsym_sec
;
5441 /* .hash section. */
5443 /* symbol version section (.gnu.version). */
5444 asection
*symver_sec
;
5445 /* Buffer large enough to hold contents of any section. */
5447 /* Buffer large enough to hold external relocs of any section. */
5448 void *external_relocs
;
5449 /* Buffer large enough to hold internal relocs of any section. */
5450 Elf_Internal_Rela
*internal_relocs
;
5451 /* Buffer large enough to hold external local symbols of any input
5453 bfd_byte
*external_syms
;
5454 /* And a buffer for symbol section indices. */
5455 Elf_External_Sym_Shndx
*locsym_shndx
;
5456 /* Buffer large enough to hold internal local symbols of any input
5458 Elf_Internal_Sym
*internal_syms
;
5459 /* Array large enough to hold a symbol index for each local symbol
5460 of any input BFD. */
5462 /* Array large enough to hold a section pointer for each local
5463 symbol of any input BFD. */
5464 asection
**sections
;
5465 /* Buffer to hold swapped out symbols. */
5467 /* And one for symbol section indices. */
5468 Elf_External_Sym_Shndx
*symshndxbuf
;
5469 /* Number of swapped out symbols in buffer. */
5470 size_t symbuf_count
;
5471 /* Number of symbols which fit in symbuf. */
5473 /* And same for symshndxbuf. */
5474 size_t shndxbuf_size
;
5477 /* This struct is used to pass information to elf_link_output_extsym. */
5479 struct elf_outext_info
5482 bfd_boolean localsyms
;
5483 struct elf_final_link_info
*finfo
;
5486 /* When performing a relocatable link, the input relocations are
5487 preserved. But, if they reference global symbols, the indices
5488 referenced must be updated. Update all the relocations in
5489 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
5492 elf_link_adjust_relocs (bfd
*abfd
,
5493 Elf_Internal_Shdr
*rel_hdr
,
5495 struct elf_link_hash_entry
**rel_hash
)
5498 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5500 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5501 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5502 bfd_vma r_type_mask
;
5505 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
5507 swap_in
= bed
->s
->swap_reloc_in
;
5508 swap_out
= bed
->s
->swap_reloc_out
;
5510 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
5512 swap_in
= bed
->s
->swap_reloca_in
;
5513 swap_out
= bed
->s
->swap_reloca_out
;
5518 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
5521 if (bed
->s
->arch_size
== 32)
5528 r_type_mask
= 0xffffffff;
5532 erela
= rel_hdr
->contents
;
5533 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
5535 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
5538 if (*rel_hash
== NULL
)
5541 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
5543 (*swap_in
) (abfd
, erela
, irela
);
5544 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
5545 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
5546 | (irela
[j
].r_info
& r_type_mask
));
5547 (*swap_out
) (abfd
, irela
, erela
);
5551 struct elf_link_sort_rela
5557 enum elf_reloc_type_class type
;
5558 /* We use this as an array of size int_rels_per_ext_rel. */
5559 Elf_Internal_Rela rela
[1];
5563 elf_link_sort_cmp1 (const void *A
, const void *B
)
5565 const struct elf_link_sort_rela
*a
= A
;
5566 const struct elf_link_sort_rela
*b
= B
;
5567 int relativea
, relativeb
;
5569 relativea
= a
->type
== reloc_class_relative
;
5570 relativeb
= b
->type
== reloc_class_relative
;
5572 if (relativea
< relativeb
)
5574 if (relativea
> relativeb
)
5576 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
5578 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
5580 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5582 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5588 elf_link_sort_cmp2 (const void *A
, const void *B
)
5590 const struct elf_link_sort_rela
*a
= A
;
5591 const struct elf_link_sort_rela
*b
= B
;
5594 if (a
->u
.offset
< b
->u
.offset
)
5596 if (a
->u
.offset
> b
->u
.offset
)
5598 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
5599 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
5604 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5606 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5612 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
5615 bfd_size_type count
, size
;
5616 size_t i
, ret
, sort_elt
, ext_size
;
5617 bfd_byte
*sort
, *s_non_relative
, *p
;
5618 struct elf_link_sort_rela
*sq
;
5619 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5620 int i2e
= bed
->s
->int_rels_per_ext_rel
;
5621 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5622 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5623 struct bfd_link_order
*lo
;
5626 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
5627 if (reldyn
== NULL
|| reldyn
->size
== 0)
5629 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
5630 if (reldyn
== NULL
|| reldyn
->size
== 0)
5632 ext_size
= bed
->s
->sizeof_rel
;
5633 swap_in
= bed
->s
->swap_reloc_in
;
5634 swap_out
= bed
->s
->swap_reloc_out
;
5638 ext_size
= bed
->s
->sizeof_rela
;
5639 swap_in
= bed
->s
->swap_reloca_in
;
5640 swap_out
= bed
->s
->swap_reloca_out
;
5642 count
= reldyn
->size
/ ext_size
;
5645 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5646 if (lo
->type
== bfd_indirect_link_order
)
5648 asection
*o
= lo
->u
.indirect
.section
;
5652 if (size
!= reldyn
->size
)
5655 sort_elt
= (sizeof (struct elf_link_sort_rela
)
5656 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
5657 sort
= bfd_zmalloc (sort_elt
* count
);
5660 (*info
->callbacks
->warning
)
5661 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
5665 if (bed
->s
->arch_size
== 32)
5666 r_sym_mask
= ~(bfd_vma
) 0xff;
5668 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
5670 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5671 if (lo
->type
== bfd_indirect_link_order
)
5673 bfd_byte
*erel
, *erelend
;
5674 asection
*o
= lo
->u
.indirect
.section
;
5677 erelend
= o
->contents
+ o
->size
;
5678 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5679 while (erel
< erelend
)
5681 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5682 (*swap_in
) (abfd
, erel
, s
->rela
);
5683 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
5684 s
->u
.sym_mask
= r_sym_mask
;
5690 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
5692 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
5694 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5695 if (s
->type
!= reloc_class_relative
)
5701 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
5702 for (; i
< count
; i
++, p
+= sort_elt
)
5704 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
5705 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
5707 sp
->u
.offset
= sq
->rela
->r_offset
;
5710 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
5712 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5713 if (lo
->type
== bfd_indirect_link_order
)
5715 bfd_byte
*erel
, *erelend
;
5716 asection
*o
= lo
->u
.indirect
.section
;
5719 erelend
= o
->contents
+ o
->size
;
5720 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5721 while (erel
< erelend
)
5723 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5724 (*swap_out
) (abfd
, s
->rela
, erel
);
5735 /* Flush the output symbols to the file. */
5738 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
5739 const struct elf_backend_data
*bed
)
5741 if (finfo
->symbuf_count
> 0)
5743 Elf_Internal_Shdr
*hdr
;
5747 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5748 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5749 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
5750 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5751 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5754 hdr
->sh_size
+= amt
;
5755 finfo
->symbuf_count
= 0;
5761 /* Add a symbol to the output symbol table. */
5764 elf_link_output_sym (struct elf_final_link_info
*finfo
,
5766 Elf_Internal_Sym
*elfsym
,
5767 asection
*input_sec
,
5768 struct elf_link_hash_entry
*h
)
5771 Elf_External_Sym_Shndx
*destshndx
;
5772 bfd_boolean (*output_symbol_hook
)
5773 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
5774 struct elf_link_hash_entry
*);
5775 const struct elf_backend_data
*bed
;
5777 bed
= get_elf_backend_data (finfo
->output_bfd
);
5778 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
5779 if (output_symbol_hook
!= NULL
)
5781 if (! (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
))
5785 if (name
== NULL
|| *name
== '\0')
5786 elfsym
->st_name
= 0;
5787 else if (input_sec
->flags
& SEC_EXCLUDE
)
5788 elfsym
->st_name
= 0;
5791 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5793 if (elfsym
->st_name
== (unsigned long) -1)
5797 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5799 if (! elf_link_flush_output_syms (finfo
, bed
))
5803 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
5804 destshndx
= finfo
->symshndxbuf
;
5805 if (destshndx
!= NULL
)
5807 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
5811 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
5812 finfo
->symshndxbuf
= destshndx
= bfd_realloc (destshndx
, amt
* 2);
5813 if (destshndx
== NULL
)
5815 memset ((char *) destshndx
+ amt
, 0, amt
);
5816 finfo
->shndxbuf_size
*= 2;
5818 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
5821 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
5822 finfo
->symbuf_count
+= 1;
5823 bfd_get_symcount (finfo
->output_bfd
) += 1;
5828 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
5829 allowing an unsatisfied unversioned symbol in the DSO to match a
5830 versioned symbol that would normally require an explicit version.
5831 We also handle the case that a DSO references a hidden symbol
5832 which may be satisfied by a versioned symbol in another DSO. */
5835 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
5836 const struct elf_backend_data
*bed
,
5837 struct elf_link_hash_entry
*h
)
5840 struct elf_link_loaded_list
*loaded
;
5842 if (!is_elf_hash_table (info
->hash
))
5845 switch (h
->root
.type
)
5851 case bfd_link_hash_undefined
:
5852 case bfd_link_hash_undefweak
:
5853 abfd
= h
->root
.u
.undef
.abfd
;
5854 if ((abfd
->flags
& DYNAMIC
) == 0
5855 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
5859 case bfd_link_hash_defined
:
5860 case bfd_link_hash_defweak
:
5861 abfd
= h
->root
.u
.def
.section
->owner
;
5864 case bfd_link_hash_common
:
5865 abfd
= h
->root
.u
.c
.p
->section
->owner
;
5868 BFD_ASSERT (abfd
!= NULL
);
5870 for (loaded
= elf_hash_table (info
)->loaded
;
5872 loaded
= loaded
->next
)
5875 Elf_Internal_Shdr
*hdr
;
5876 bfd_size_type symcount
;
5877 bfd_size_type extsymcount
;
5878 bfd_size_type extsymoff
;
5879 Elf_Internal_Shdr
*versymhdr
;
5880 Elf_Internal_Sym
*isym
;
5881 Elf_Internal_Sym
*isymend
;
5882 Elf_Internal_Sym
*isymbuf
;
5883 Elf_External_Versym
*ever
;
5884 Elf_External_Versym
*extversym
;
5886 input
= loaded
->abfd
;
5888 /* We check each DSO for a possible hidden versioned definition. */
5890 || (input
->flags
& DYNAMIC
) == 0
5891 || elf_dynversym (input
) == 0)
5894 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
5896 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
5897 if (elf_bad_symtab (input
))
5899 extsymcount
= symcount
;
5904 extsymcount
= symcount
- hdr
->sh_info
;
5905 extsymoff
= hdr
->sh_info
;
5908 if (extsymcount
== 0)
5911 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
5913 if (isymbuf
== NULL
)
5916 /* Read in any version definitions. */
5917 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
5918 extversym
= bfd_malloc (versymhdr
->sh_size
);
5919 if (extversym
== NULL
)
5922 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
5923 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
5924 != versymhdr
->sh_size
))
5932 ever
= extversym
+ extsymoff
;
5933 isymend
= isymbuf
+ extsymcount
;
5934 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
5937 Elf_Internal_Versym iver
;
5938 unsigned short version_index
;
5940 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
5941 || isym
->st_shndx
== SHN_UNDEF
)
5944 name
= bfd_elf_string_from_elf_section (input
,
5947 if (strcmp (name
, h
->root
.root
.string
) != 0)
5950 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
5952 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
5954 /* If we have a non-hidden versioned sym, then it should
5955 have provided a definition for the undefined sym. */
5959 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
5960 if (version_index
== 1 || version_index
== 2)
5962 /* This is the base or first version. We can use it. */
5976 /* Add an external symbol to the symbol table. This is called from
5977 the hash table traversal routine. When generating a shared object,
5978 we go through the symbol table twice. The first time we output
5979 anything that might have been forced to local scope in a version
5980 script. The second time we output the symbols that are still
5984 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
5986 struct elf_outext_info
*eoinfo
= data
;
5987 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5989 Elf_Internal_Sym sym
;
5990 asection
*input_sec
;
5991 const struct elf_backend_data
*bed
;
5993 if (h
->root
.type
== bfd_link_hash_warning
)
5995 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5996 if (h
->root
.type
== bfd_link_hash_new
)
6000 /* Decide whether to output this symbol in this pass. */
6001 if (eoinfo
->localsyms
)
6003 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6008 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6012 bed
= get_elf_backend_data (finfo
->output_bfd
);
6014 /* If we have an undefined symbol reference here then it must have
6015 come from a shared library that is being linked in. (Undefined
6016 references in regular files have already been handled). If we
6017 are reporting errors for this situation then do so now. */
6018 if (h
->root
.type
== bfd_link_hash_undefined
6019 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
6020 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
6021 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
6022 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
6024 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6025 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
6026 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
6028 eoinfo
->failed
= TRUE
;
6033 /* We should also warn if a forced local symbol is referenced from
6034 shared libraries. */
6035 if (! finfo
->info
->relocatable
6036 && (! finfo
->info
->shared
)
6037 && (h
->elf_link_hash_flags
6038 & (ELF_LINK_FORCED_LOCAL
| ELF_LINK_HASH_REF_DYNAMIC
| ELF_LINK_DYNAMIC_DEF
| ELF_LINK_DYNAMIC_WEAK
))
6039 == (ELF_LINK_FORCED_LOCAL
| ELF_LINK_HASH_REF_DYNAMIC
)
6040 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
6042 (*_bfd_error_handler
)
6043 (_("%s: %s symbol `%s' in %s is referenced by DSO"),
6044 bfd_get_filename (finfo
->output_bfd
),
6045 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
6047 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
6048 ? "hidden" : "local",
6049 h
->root
.root
.string
,
6050 bfd_archive_filename (h
->root
.u
.def
.section
->owner
));
6051 eoinfo
->failed
= TRUE
;
6055 /* We don't want to output symbols that have never been mentioned by
6056 a regular file, or that we have been told to strip. However, if
6057 h->indx is set to -2, the symbol is used by a reloc and we must
6061 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
6062 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
6063 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
6064 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
6066 else if (finfo
->info
->strip
== strip_all
)
6068 else if (finfo
->info
->strip
== strip_some
6069 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6070 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
6072 else if (finfo
->info
->strip_discarded
6073 && (h
->root
.type
== bfd_link_hash_defined
6074 || h
->root
.type
== bfd_link_hash_defweak
)
6075 && elf_discarded_section (h
->root
.u
.def
.section
))
6080 /* If we're stripping it, and it's not a dynamic symbol, there's
6081 nothing else to do unless it is a forced local symbol. */
6084 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6088 sym
.st_size
= h
->size
;
6089 sym
.st_other
= h
->other
;
6090 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6091 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6092 else if (h
->root
.type
== bfd_link_hash_undefweak
6093 || h
->root
.type
== bfd_link_hash_defweak
)
6094 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6096 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6098 switch (h
->root
.type
)
6101 case bfd_link_hash_new
:
6102 case bfd_link_hash_warning
:
6106 case bfd_link_hash_undefined
:
6107 case bfd_link_hash_undefweak
:
6108 input_sec
= bfd_und_section_ptr
;
6109 sym
.st_shndx
= SHN_UNDEF
;
6112 case bfd_link_hash_defined
:
6113 case bfd_link_hash_defweak
:
6115 input_sec
= h
->root
.u
.def
.section
;
6116 if (input_sec
->output_section
!= NULL
)
6119 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6120 input_sec
->output_section
);
6121 if (sym
.st_shndx
== SHN_BAD
)
6123 char *sec_name
= bfd_get_section_ident (input_sec
);
6124 (*_bfd_error_handler
)
6125 (_("%s: could not find output section %s for input section %s"),
6126 bfd_get_filename (finfo
->output_bfd
),
6127 input_sec
->output_section
->name
,
6128 sec_name
? sec_name
: input_sec
->name
);
6131 eoinfo
->failed
= TRUE
;
6135 /* ELF symbols in relocatable files are section relative,
6136 but in nonrelocatable files they are virtual
6138 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6139 if (! finfo
->info
->relocatable
)
6141 sym
.st_value
+= input_sec
->output_section
->vma
;
6142 if (h
->type
== STT_TLS
)
6144 /* STT_TLS symbols are relative to PT_TLS segment
6146 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6147 sym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6153 BFD_ASSERT (input_sec
->owner
== NULL
6154 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6155 sym
.st_shndx
= SHN_UNDEF
;
6156 input_sec
= bfd_und_section_ptr
;
6161 case bfd_link_hash_common
:
6162 input_sec
= h
->root
.u
.c
.p
->section
;
6163 sym
.st_shndx
= SHN_COMMON
;
6164 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6167 case bfd_link_hash_indirect
:
6168 /* These symbols are created by symbol versioning. They point
6169 to the decorated version of the name. For example, if the
6170 symbol foo@@GNU_1.2 is the default, which should be used when
6171 foo is used with no version, then we add an indirect symbol
6172 foo which points to foo@@GNU_1.2. We ignore these symbols,
6173 since the indirected symbol is already in the hash table. */
6177 /* Give the processor backend a chance to tweak the symbol value,
6178 and also to finish up anything that needs to be done for this
6179 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6180 forced local syms when non-shared is due to a historical quirk. */
6181 if ((h
->dynindx
!= -1
6182 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6183 && ((finfo
->info
->shared
6184 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
6185 || h
->root
.type
!= bfd_link_hash_undefweak
))
6186 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6187 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6189 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6190 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6192 eoinfo
->failed
= TRUE
;
6197 /* If we are marking the symbol as undefined, and there are no
6198 non-weak references to this symbol from a regular object, then
6199 mark the symbol as weak undefined; if there are non-weak
6200 references, mark the symbol as strong. We can't do this earlier,
6201 because it might not be marked as undefined until the
6202 finish_dynamic_symbol routine gets through with it. */
6203 if (sym
.st_shndx
== SHN_UNDEF
6204 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6205 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6206 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6210 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6211 bindtype
= STB_GLOBAL
;
6213 bindtype
= STB_WEAK
;
6214 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6217 /* If a non-weak symbol with non-default visibility is not defined
6218 locally, it is a fatal error. */
6219 if (! finfo
->info
->relocatable
6220 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
6221 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
6222 && h
->root
.type
== bfd_link_hash_undefined
6223 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6225 (*_bfd_error_handler
)
6226 (_("%s: %s symbol `%s' isn't defined"),
6227 bfd_get_filename (finfo
->output_bfd
),
6228 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
6230 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
6231 ? "internal" : "hidden",
6232 h
->root
.root
.string
);
6233 eoinfo
->failed
= TRUE
;
6237 /* If this symbol should be put in the .dynsym section, then put it
6238 there now. We already know the symbol index. We also fill in
6239 the entry in the .hash section. */
6240 if (h
->dynindx
!= -1
6241 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6245 size_t hash_entry_size
;
6246 bfd_byte
*bucketpos
;
6250 sym
.st_name
= h
->dynstr_index
;
6251 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
6252 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
6254 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6255 bucket
= h
->elf_hash_value
% bucketcount
;
6257 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6258 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6259 + (bucket
+ 2) * hash_entry_size
);
6260 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6261 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
6262 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6263 ((bfd_byte
*) finfo
->hash_sec
->contents
6264 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6266 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6268 Elf_Internal_Versym iversym
;
6269 Elf_External_Versym
*eversym
;
6271 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6273 if (h
->verinfo
.verdef
== NULL
)
6274 iversym
.vs_vers
= 0;
6276 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6280 if (h
->verinfo
.vertree
== NULL
)
6281 iversym
.vs_vers
= 1;
6283 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6286 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6287 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6289 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6290 eversym
+= h
->dynindx
;
6291 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6295 /* If we're stripping it, then it was just a dynamic symbol, and
6296 there's nothing else to do. */
6297 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
6300 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6302 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
))
6304 eoinfo
->failed
= TRUE
;
6311 /* Return TRUE if special handling is done for relocs in SEC against
6312 symbols defined in discarded sections. */
6315 elf_section_ignore_discarded_relocs (asection
*sec
)
6317 const struct elf_backend_data
*bed
;
6319 switch (sec
->sec_info_type
)
6321 case ELF_INFO_TYPE_STABS
:
6322 case ELF_INFO_TYPE_EH_FRAME
:
6328 bed
= get_elf_backend_data (sec
->owner
);
6329 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
6330 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
6336 /* Return TRUE if we should complain about a reloc in SEC against a
6337 symbol defined in a discarded section. */
6340 elf_section_complain_discarded (asection
*sec
)
6342 if (strncmp (".stab", sec
->name
, 5) == 0
6343 && (!sec
->name
[5] ||
6344 (sec
->name
[5] == '.' && ISDIGIT (sec
->name
[6]))))
6347 if (strcmp (".eh_frame", sec
->name
) == 0)
6350 if (strcmp (".gcc_except_table", sec
->name
) == 0)
6353 if (strcmp (".PARISC.unwind", sec
->name
) == 0)
6359 /* Find a match between a section and a member of a section group. */
6362 match_group_member (asection
*sec
, asection
*group
)
6364 asection
*first
= elf_next_in_group (group
);
6365 asection
*s
= first
;
6369 if (bfd_elf_match_symbols_in_sections (s
, sec
))
6379 /* Link an input file into the linker output file. This function
6380 handles all the sections and relocations of the input file at once.
6381 This is so that we only have to read the local symbols once, and
6382 don't have to keep them in memory. */
6385 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
6387 bfd_boolean (*relocate_section
)
6388 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
6389 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
6391 Elf_Internal_Shdr
*symtab_hdr
;
6394 Elf_Internal_Sym
*isymbuf
;
6395 Elf_Internal_Sym
*isym
;
6396 Elf_Internal_Sym
*isymend
;
6398 asection
**ppsection
;
6400 const struct elf_backend_data
*bed
;
6401 bfd_boolean emit_relocs
;
6402 struct elf_link_hash_entry
**sym_hashes
;
6404 output_bfd
= finfo
->output_bfd
;
6405 bed
= get_elf_backend_data (output_bfd
);
6406 relocate_section
= bed
->elf_backend_relocate_section
;
6408 /* If this is a dynamic object, we don't want to do anything here:
6409 we don't want the local symbols, and we don't want the section
6411 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6414 emit_relocs
= (finfo
->info
->relocatable
6415 || finfo
->info
->emitrelocations
6416 || bed
->elf_backend_emit_relocs
);
6418 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6419 if (elf_bad_symtab (input_bfd
))
6421 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
6426 locsymcount
= symtab_hdr
->sh_info
;
6427 extsymoff
= symtab_hdr
->sh_info
;
6430 /* Read the local symbols. */
6431 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6432 if (isymbuf
== NULL
&& locsymcount
!= 0)
6434 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6435 finfo
->internal_syms
,
6436 finfo
->external_syms
,
6437 finfo
->locsym_shndx
);
6438 if (isymbuf
== NULL
)
6442 /* Find local symbol sections and adjust values of symbols in
6443 SEC_MERGE sections. Write out those local symbols we know are
6444 going into the output file. */
6445 isymend
= isymbuf
+ locsymcount
;
6446 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
6448 isym
++, pindex
++, ppsection
++)
6452 Elf_Internal_Sym osym
;
6456 if (elf_bad_symtab (input_bfd
))
6458 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6465 if (isym
->st_shndx
== SHN_UNDEF
)
6466 isec
= bfd_und_section_ptr
;
6467 else if (isym
->st_shndx
< SHN_LORESERVE
6468 || isym
->st_shndx
> SHN_HIRESERVE
)
6470 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
6472 && isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
6473 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6475 _bfd_merged_section_offset (output_bfd
, &isec
,
6476 elf_section_data (isec
)->sec_info
,
6479 else if (isym
->st_shndx
== SHN_ABS
)
6480 isec
= bfd_abs_section_ptr
;
6481 else if (isym
->st_shndx
== SHN_COMMON
)
6482 isec
= bfd_com_section_ptr
;
6491 /* Don't output the first, undefined, symbol. */
6492 if (ppsection
== finfo
->sections
)
6495 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6497 /* We never output section symbols. Instead, we use the
6498 section symbol of the corresponding section in the output
6503 /* If we are stripping all symbols, we don't want to output this
6505 if (finfo
->info
->strip
== strip_all
)
6508 /* If we are discarding all local symbols, we don't want to
6509 output this one. If we are generating a relocatable output
6510 file, then some of the local symbols may be required by
6511 relocs; we output them below as we discover that they are
6513 if (finfo
->info
->discard
== discard_all
)
6516 /* If this symbol is defined in a section which we are
6517 discarding, we don't need to keep it, but note that
6518 linker_mark is only reliable for sections that have contents.
6519 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6520 as well as linker_mark. */
6521 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6523 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6524 || (! finfo
->info
->relocatable
6525 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6528 /* Get the name of the symbol. */
6529 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6534 /* See if we are discarding symbols with this name. */
6535 if ((finfo
->info
->strip
== strip_some
6536 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
6538 || (((finfo
->info
->discard
== discard_sec_merge
6539 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
6540 || finfo
->info
->discard
== discard_l
)
6541 && bfd_is_local_label_name (input_bfd
, name
)))
6544 /* If we get here, we are going to output this symbol. */
6548 /* Adjust the section index for the output file. */
6549 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6550 isec
->output_section
);
6551 if (osym
.st_shndx
== SHN_BAD
)
6554 *pindex
= bfd_get_symcount (output_bfd
);
6556 /* ELF symbols in relocatable files are section relative, but
6557 in executable files they are virtual addresses. Note that
6558 this code assumes that all ELF sections have an associated
6559 BFD section with a reasonable value for output_offset; below
6560 we assume that they also have a reasonable value for
6561 output_section. Any special sections must be set up to meet
6562 these requirements. */
6563 osym
.st_value
+= isec
->output_offset
;
6564 if (! finfo
->info
->relocatable
)
6566 osym
.st_value
+= isec
->output_section
->vma
;
6567 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
6569 /* STT_TLS symbols are relative to PT_TLS segment base. */
6570 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6571 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6575 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
))
6579 /* Relocate the contents of each section. */
6580 sym_hashes
= elf_sym_hashes (input_bfd
);
6581 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6585 if (! o
->linker_mark
)
6587 /* This section was omitted from the link. */
6591 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6592 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6595 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6597 /* Section was created by _bfd_elf_link_create_dynamic_sections
6602 /* Get the contents of the section. They have been cached by a
6603 relaxation routine. Note that o is a section in an input
6604 file, so the contents field will not have been set by any of
6605 the routines which work on output files. */
6606 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6607 contents
= elf_section_data (o
)->this_hdr
.contents
;
6610 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
6612 contents
= finfo
->contents
;
6613 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
6617 if ((o
->flags
& SEC_RELOC
) != 0)
6619 Elf_Internal_Rela
*internal_relocs
;
6620 bfd_vma r_type_mask
;
6623 /* Get the swapped relocs. */
6625 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
6626 finfo
->internal_relocs
, FALSE
);
6627 if (internal_relocs
== NULL
6628 && o
->reloc_count
> 0)
6631 if (bed
->s
->arch_size
== 32)
6638 r_type_mask
= 0xffffffff;
6642 /* Run through the relocs looking for any against symbols
6643 from discarded sections and section symbols from
6644 removed link-once sections. Complain about relocs
6645 against discarded sections. Zero relocs against removed
6646 link-once sections. Preserve debug information as much
6648 if (!elf_section_ignore_discarded_relocs (o
))
6650 Elf_Internal_Rela
*rel
, *relend
;
6651 bfd_boolean complain
= elf_section_complain_discarded (o
);
6653 rel
= internal_relocs
;
6654 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6655 for ( ; rel
< relend
; rel
++)
6657 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
6658 asection
**ps
, *sec
;
6659 struct elf_link_hash_entry
*h
= NULL
;
6660 const char *sym_name
;
6662 if (r_symndx
>= locsymcount
6663 || (elf_bad_symtab (input_bfd
)
6664 && finfo
->sections
[r_symndx
] == NULL
))
6666 h
= sym_hashes
[r_symndx
- extsymoff
];
6667 while (h
->root
.type
== bfd_link_hash_indirect
6668 || h
->root
.type
== bfd_link_hash_warning
)
6669 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6671 if (h
->root
.type
!= bfd_link_hash_defined
6672 && h
->root
.type
!= bfd_link_hash_defweak
)
6675 ps
= &h
->root
.u
.def
.section
;
6676 sym_name
= h
->root
.root
.string
;
6680 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
6681 ps
= &finfo
->sections
[r_symndx
];
6682 sym_name
= bfd_elf_local_sym_name (input_bfd
, sym
);
6685 /* Complain if the definition comes from a
6686 discarded section. */
6687 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
6689 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6691 BFD_ASSERT (r_symndx
!= 0);
6693 /* Try to preserve debug information.
6694 FIXME: This is quite broken. Modifying
6695 the symbol here means we will be changing
6696 all uses of the symbol, not just those in
6697 debug sections. The only thing that makes
6698 this half reasonable is that debug sections
6699 tend to come after other sections. Of
6700 course, that doesn't help with globals.
6701 ??? All link-once sections of the same name
6702 ought to define the same set of symbols, so
6703 it would seem that globals ought to always
6704 be defined in the kept section. */
6705 if (sec
->kept_section
!= NULL
)
6709 /* Check if it is a linkonce section or
6710 member of a comdat group. */
6711 if (elf_sec_group (sec
) == NULL
6712 && sec
->size
== sec
->kept_section
->size
)
6714 *ps
= sec
->kept_section
;
6717 else if (elf_sec_group (sec
) != NULL
6718 && (member
= match_group_member (sec
, sec
->kept_section
))
6719 && sec
->size
== member
->size
)
6728 char *r_sec
= bfd_get_section_ident (o
);
6729 char *d_sec
= bfd_get_section_ident (sec
);
6731 finfo
->info
->callbacks
->error_handler
6732 (LD_DEFINITION_IN_DISCARDED_SECTION
,
6733 _("`%T' referenced in section `%s' of %B: "
6734 "defined in discarded section `%s' of %B\n"),
6736 r_sec
? r_sec
: o
->name
, input_bfd
,
6737 d_sec
? d_sec
: sec
->name
, sec
->owner
);
6744 /* Remove the symbol reference from the reloc, but
6745 don't kill the reloc completely. This is so that
6746 a zero value will be written into the section,
6747 which may have non-zero contents put there by the
6748 assembler. Zero in things like an eh_frame fde
6749 pc_begin allows stack unwinders to recognize the
6751 rel
->r_info
&= r_type_mask
;
6757 /* Relocate the section by invoking a back end routine.
6759 The back end routine is responsible for adjusting the
6760 section contents as necessary, and (if using Rela relocs
6761 and generating a relocatable output file) adjusting the
6762 reloc addend as necessary.
6764 The back end routine does not have to worry about setting
6765 the reloc address or the reloc symbol index.
6767 The back end routine is given a pointer to the swapped in
6768 internal symbols, and can access the hash table entries
6769 for the external symbols via elf_sym_hashes (input_bfd).
6771 When generating relocatable output, the back end routine
6772 must handle STB_LOCAL/STT_SECTION symbols specially. The
6773 output symbol is going to be a section symbol
6774 corresponding to the output section, which will require
6775 the addend to be adjusted. */
6777 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6778 input_bfd
, o
, contents
,
6786 Elf_Internal_Rela
*irela
;
6787 Elf_Internal_Rela
*irelaend
;
6788 bfd_vma last_offset
;
6789 struct elf_link_hash_entry
**rel_hash
;
6790 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
6791 unsigned int next_erel
;
6792 bfd_boolean (*reloc_emitter
)
6793 (bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*);
6794 bfd_boolean rela_normal
;
6796 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6797 rela_normal
= (bed
->rela_normal
6798 && (input_rel_hdr
->sh_entsize
6799 == bed
->s
->sizeof_rela
));
6801 /* Adjust the reloc addresses and symbol indices. */
6803 irela
= internal_relocs
;
6804 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6805 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6806 + elf_section_data (o
->output_section
)->rel_count
6807 + elf_section_data (o
->output_section
)->rel_count2
);
6808 last_offset
= o
->output_offset
;
6809 if (!finfo
->info
->relocatable
)
6810 last_offset
+= o
->output_section
->vma
;
6811 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6813 unsigned long r_symndx
;
6815 Elf_Internal_Sym sym
;
6817 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6823 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
6826 if (irela
->r_offset
>= (bfd_vma
) -2)
6828 /* This is a reloc for a deleted entry or somesuch.
6829 Turn it into an R_*_NONE reloc, at the same
6830 offset as the last reloc. elf_eh_frame.c and
6831 elf_bfd_discard_info rely on reloc offsets
6833 irela
->r_offset
= last_offset
;
6835 irela
->r_addend
= 0;
6839 irela
->r_offset
+= o
->output_offset
;
6841 /* Relocs in an executable have to be virtual addresses. */
6842 if (!finfo
->info
->relocatable
)
6843 irela
->r_offset
+= o
->output_section
->vma
;
6845 last_offset
= irela
->r_offset
;
6847 r_symndx
= irela
->r_info
>> r_sym_shift
;
6848 if (r_symndx
== STN_UNDEF
)
6851 if (r_symndx
>= locsymcount
6852 || (elf_bad_symtab (input_bfd
)
6853 && finfo
->sections
[r_symndx
] == NULL
))
6855 struct elf_link_hash_entry
*rh
;
6858 /* This is a reloc against a global symbol. We
6859 have not yet output all the local symbols, so
6860 we do not know the symbol index of any global
6861 symbol. We set the rel_hash entry for this
6862 reloc to point to the global hash table entry
6863 for this symbol. The symbol index is then
6864 set at the end of elf_bfd_final_link. */
6865 indx
= r_symndx
- extsymoff
;
6866 rh
= elf_sym_hashes (input_bfd
)[indx
];
6867 while (rh
->root
.type
== bfd_link_hash_indirect
6868 || rh
->root
.type
== bfd_link_hash_warning
)
6869 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6871 /* Setting the index to -2 tells
6872 elf_link_output_extsym that this symbol is
6874 BFD_ASSERT (rh
->indx
< 0);
6882 /* This is a reloc against a local symbol. */
6885 sym
= isymbuf
[r_symndx
];
6886 sec
= finfo
->sections
[r_symndx
];
6887 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
6889 /* I suppose the backend ought to fill in the
6890 section of any STT_SECTION symbol against a
6891 processor specific section. */
6893 if (bfd_is_abs_section (sec
))
6895 else if (sec
== NULL
|| sec
->owner
== NULL
)
6897 bfd_set_error (bfd_error_bad_value
);
6902 asection
*osec
= sec
->output_section
;
6904 /* If we have discarded a section, the output
6905 section will be the absolute section. In
6906 case of discarded link-once and discarded
6907 SEC_MERGE sections, use the kept section. */
6908 if (bfd_is_abs_section (osec
)
6909 && sec
->kept_section
!= NULL
6910 && sec
->kept_section
->output_section
!= NULL
)
6912 osec
= sec
->kept_section
->output_section
;
6913 irela
->r_addend
-= osec
->vma
;
6916 if (!bfd_is_abs_section (osec
))
6918 r_symndx
= osec
->target_index
;
6919 BFD_ASSERT (r_symndx
!= 0);
6923 /* Adjust the addend according to where the
6924 section winds up in the output section. */
6926 irela
->r_addend
+= sec
->output_offset
;
6930 if (finfo
->indices
[r_symndx
] == -1)
6932 unsigned long shlink
;
6936 if (finfo
->info
->strip
== strip_all
)
6938 /* You can't do ld -r -s. */
6939 bfd_set_error (bfd_error_invalid_operation
);
6943 /* This symbol was skipped earlier, but
6944 since it is needed by a reloc, we
6945 must output it now. */
6946 shlink
= symtab_hdr
->sh_link
;
6947 name
= (bfd_elf_string_from_elf_section
6948 (input_bfd
, shlink
, sym
.st_name
));
6952 osec
= sec
->output_section
;
6954 _bfd_elf_section_from_bfd_section (output_bfd
,
6956 if (sym
.st_shndx
== SHN_BAD
)
6959 sym
.st_value
+= sec
->output_offset
;
6960 if (! finfo
->info
->relocatable
)
6962 sym
.st_value
+= osec
->vma
;
6963 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
6965 /* STT_TLS symbols are relative to PT_TLS
6967 BFD_ASSERT (elf_hash_table (finfo
->info
)
6969 sym
.st_value
-= (elf_hash_table (finfo
->info
)
6974 finfo
->indices
[r_symndx
]
6975 = bfd_get_symcount (output_bfd
);
6977 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
,
6982 r_symndx
= finfo
->indices
[r_symndx
];
6985 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
6986 | (irela
->r_info
& r_type_mask
));
6989 /* Swap out the relocs. */
6990 if (bed
->elf_backend_emit_relocs
6991 && !(finfo
->info
->relocatable
6992 || finfo
->info
->emitrelocations
))
6993 reloc_emitter
= bed
->elf_backend_emit_relocs
;
6995 reloc_emitter
= _bfd_elf_link_output_relocs
;
6997 if (input_rel_hdr
->sh_size
!= 0
6998 && ! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
7002 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
7003 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
7005 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
7006 * bed
->s
->int_rels_per_ext_rel
);
7007 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr2
,
7014 /* Write out the modified section contents. */
7015 if (bed
->elf_backend_write_section
7016 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
7018 /* Section written out. */
7020 else switch (o
->sec_info_type
)
7022 case ELF_INFO_TYPE_STABS
:
7023 if (! (_bfd_write_section_stabs
7025 &elf_hash_table (finfo
->info
)->stab_info
,
7026 o
, &elf_section_data (o
)->sec_info
, contents
)))
7029 case ELF_INFO_TYPE_MERGE
:
7030 if (! _bfd_write_merged_section (output_bfd
, o
,
7031 elf_section_data (o
)->sec_info
))
7034 case ELF_INFO_TYPE_EH_FRAME
:
7036 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
7043 if (! (o
->flags
& SEC_EXCLUDE
)
7044 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
7046 (file_ptr
) o
->output_offset
,
7057 /* Generate a reloc when linking an ELF file. This is a reloc
7058 requested by the linker, and does come from any input file. This
7059 is used to build constructor and destructor tables when linking
7063 elf_reloc_link_order (bfd
*output_bfd
,
7064 struct bfd_link_info
*info
,
7065 asection
*output_section
,
7066 struct bfd_link_order
*link_order
)
7068 reloc_howto_type
*howto
;
7072 struct elf_link_hash_entry
**rel_hash_ptr
;
7073 Elf_Internal_Shdr
*rel_hdr
;
7074 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7075 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
7079 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
7082 bfd_set_error (bfd_error_bad_value
);
7086 addend
= link_order
->u
.reloc
.p
->addend
;
7088 /* Figure out the symbol index. */
7089 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
7090 + elf_section_data (output_section
)->rel_count
7091 + elf_section_data (output_section
)->rel_count2
);
7092 if (link_order
->type
== bfd_section_reloc_link_order
)
7094 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
7095 BFD_ASSERT (indx
!= 0);
7096 *rel_hash_ptr
= NULL
;
7100 struct elf_link_hash_entry
*h
;
7102 /* Treat a reloc against a defined symbol as though it were
7103 actually against the section. */
7104 h
= ((struct elf_link_hash_entry
*)
7105 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7106 link_order
->u
.reloc
.p
->u
.name
,
7107 FALSE
, FALSE
, TRUE
));
7109 && (h
->root
.type
== bfd_link_hash_defined
7110 || h
->root
.type
== bfd_link_hash_defweak
))
7114 section
= h
->root
.u
.def
.section
;
7115 indx
= section
->output_section
->target_index
;
7116 *rel_hash_ptr
= NULL
;
7117 /* It seems that we ought to add the symbol value to the
7118 addend here, but in practice it has already been added
7119 because it was passed to constructor_callback. */
7120 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7124 /* Setting the index to -2 tells elf_link_output_extsym that
7125 this symbol is used by a reloc. */
7132 if (! ((*info
->callbacks
->unattached_reloc
)
7133 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
7139 /* If this is an inplace reloc, we must write the addend into the
7141 if (howto
->partial_inplace
&& addend
!= 0)
7144 bfd_reloc_status_type rstat
;
7147 const char *sym_name
;
7149 size
= bfd_get_reloc_size (howto
);
7150 buf
= bfd_zmalloc (size
);
7153 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
7160 case bfd_reloc_outofrange
:
7163 case bfd_reloc_overflow
:
7164 if (link_order
->type
== bfd_section_reloc_link_order
)
7165 sym_name
= bfd_section_name (output_bfd
,
7166 link_order
->u
.reloc
.p
->u
.section
);
7168 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7169 if (! ((*info
->callbacks
->reloc_overflow
)
7170 (info
, sym_name
, howto
->name
, addend
, NULL
, NULL
, 0)))
7177 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
7178 link_order
->offset
, size
);
7184 /* The address of a reloc is relative to the section in a
7185 relocatable file, and is a virtual address in an executable
7187 offset
= link_order
->offset
;
7188 if (! info
->relocatable
)
7189 offset
+= output_section
->vma
;
7191 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7193 irel
[i
].r_offset
= offset
;
7195 irel
[i
].r_addend
= 0;
7197 if (bed
->s
->arch_size
== 32)
7198 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
7200 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
7202 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7203 erel
= rel_hdr
->contents
;
7204 if (rel_hdr
->sh_type
== SHT_REL
)
7206 erel
+= (elf_section_data (output_section
)->rel_count
7207 * bed
->s
->sizeof_rel
);
7208 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
7212 irel
[0].r_addend
= addend
;
7213 erel
+= (elf_section_data (output_section
)->rel_count
7214 * bed
->s
->sizeof_rela
);
7215 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
7218 ++elf_section_data (output_section
)->rel_count
;
7224 /* Get the output vma of the section pointed to by the sh_link field. */
7227 elf_get_linked_section_vma (struct bfd_link_order
*p
)
7229 Elf_Internal_Shdr
**elf_shdrp
;
7233 s
= p
->u
.indirect
.section
;
7234 elf_shdrp
= elf_elfsections (s
->owner
);
7235 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
7236 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
7238 The Intel C compiler generates SHT_IA_64_UNWIND with
7239 SHF_LINK_ORDER. But it doesn't set theh sh_link or
7240 sh_info fields. Hence we could get the situation
7241 where elfsec is 0. */
7244 const struct elf_backend_data
*bed
7245 = get_elf_backend_data (s
->owner
);
7246 if (bed
->link_order_error_handler
)
7248 char *name
= bfd_get_section_ident (s
);
7249 bed
->link_order_error_handler
7250 (_("%s: warning: sh_link not set for section `%s'"),
7251 bfd_archive_filename (s
->owner
),
7252 name
? name
: s
->name
);
7260 s
= elf_shdrp
[elfsec
]->bfd_section
;
7261 return s
->output_section
->vma
+ s
->output_offset
;
7266 /* Compare two sections based on the locations of the sections they are
7267 linked to. Used by elf_fixup_link_order. */
7270 compare_link_order (const void * a
, const void * b
)
7275 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
7276 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
7283 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
7284 order as their linked sections. Returns false if this could not be done
7285 because an output section includes both ordered and unordered
7286 sections. Ideally we'd do this in the linker proper. */
7289 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
7294 struct bfd_link_order
*p
;
7296 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7298 struct bfd_link_order
**sections
;
7304 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7306 if (p
->type
== bfd_indirect_link_order
7307 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
7308 == bfd_target_elf_flavour
)
7309 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
7311 s
= p
->u
.indirect
.section
;
7312 elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
);
7314 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
)
7323 if (!seen_linkorder
)
7326 if (seen_other
&& seen_linkorder
)
7328 (*_bfd_error_handler
) (_("%s: has both ordered and unordered sections"),
7330 bfd_set_error (bfd_error_bad_value
);
7334 sections
= (struct bfd_link_order
**)
7335 xmalloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
7338 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7340 sections
[seen_linkorder
++] = p
;
7342 /* Sort the input sections in the order of their linked section. */
7343 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
7344 compare_link_order
);
7346 /* Change the offsets of the sections. */
7348 for (n
= 0; n
< seen_linkorder
; n
++)
7350 s
= sections
[n
]->u
.indirect
.section
;
7351 offset
&= ~(bfd_vma
)((1 << s
->alignment_power
) - 1);
7352 s
->output_offset
= offset
;
7353 sections
[n
]->offset
= offset
;
7354 offset
+= sections
[n
]->size
;
7361 /* Do the final step of an ELF link. */
7364 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
7366 bfd_boolean dynamic
;
7367 bfd_boolean emit_relocs
;
7369 struct elf_final_link_info finfo
;
7370 register asection
*o
;
7371 register struct bfd_link_order
*p
;
7373 bfd_size_type max_contents_size
;
7374 bfd_size_type max_external_reloc_size
;
7375 bfd_size_type max_internal_reloc_count
;
7376 bfd_size_type max_sym_count
;
7377 bfd_size_type max_sym_shndx_count
;
7379 Elf_Internal_Sym elfsym
;
7381 Elf_Internal_Shdr
*symtab_hdr
;
7382 Elf_Internal_Shdr
*symtab_shndx_hdr
;
7383 Elf_Internal_Shdr
*symstrtab_hdr
;
7384 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7385 struct elf_outext_info eoinfo
;
7387 size_t relativecount
= 0;
7388 asection
*reldyn
= 0;
7391 if (! is_elf_hash_table (info
->hash
))
7395 abfd
->flags
|= DYNAMIC
;
7397 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
7398 dynobj
= elf_hash_table (info
)->dynobj
;
7400 emit_relocs
= (info
->relocatable
7401 || info
->emitrelocations
7402 || bed
->elf_backend_emit_relocs
);
7405 finfo
.output_bfd
= abfd
;
7406 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
7407 if (finfo
.symstrtab
== NULL
)
7412 finfo
.dynsym_sec
= NULL
;
7413 finfo
.hash_sec
= NULL
;
7414 finfo
.symver_sec
= NULL
;
7418 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
7419 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
7420 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
7421 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
7422 /* Note that it is OK if symver_sec is NULL. */
7425 finfo
.contents
= NULL
;
7426 finfo
.external_relocs
= NULL
;
7427 finfo
.internal_relocs
= NULL
;
7428 finfo
.external_syms
= NULL
;
7429 finfo
.locsym_shndx
= NULL
;
7430 finfo
.internal_syms
= NULL
;
7431 finfo
.indices
= NULL
;
7432 finfo
.sections
= NULL
;
7433 finfo
.symbuf
= NULL
;
7434 finfo
.symshndxbuf
= NULL
;
7435 finfo
.symbuf_count
= 0;
7436 finfo
.shndxbuf_size
= 0;
7438 /* Count up the number of relocations we will output for each output
7439 section, so that we know the sizes of the reloc sections. We
7440 also figure out some maximum sizes. */
7441 max_contents_size
= 0;
7442 max_external_reloc_size
= 0;
7443 max_internal_reloc_count
= 0;
7445 max_sym_shndx_count
= 0;
7447 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7449 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
7452 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7454 unsigned int reloc_count
= 0;
7455 struct bfd_elf_section_data
*esdi
= NULL
;
7456 unsigned int *rel_count1
;
7458 if (p
->type
== bfd_section_reloc_link_order
7459 || p
->type
== bfd_symbol_reloc_link_order
)
7461 else if (p
->type
== bfd_indirect_link_order
)
7465 sec
= p
->u
.indirect
.section
;
7466 esdi
= elf_section_data (sec
);
7468 /* Mark all sections which are to be included in the
7469 link. This will normally be every section. We need
7470 to do this so that we can identify any sections which
7471 the linker has decided to not include. */
7472 sec
->linker_mark
= TRUE
;
7474 if (sec
->flags
& SEC_MERGE
)
7477 if (info
->relocatable
|| info
->emitrelocations
)
7478 reloc_count
= sec
->reloc_count
;
7479 else if (bed
->elf_backend_count_relocs
)
7481 Elf_Internal_Rela
* relocs
;
7483 relocs
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
7486 reloc_count
= (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
7488 if (elf_section_data (o
)->relocs
!= relocs
)
7492 if (sec
->rawsize
> max_contents_size
)
7493 max_contents_size
= sec
->rawsize
;
7494 if (sec
->size
> max_contents_size
)
7495 max_contents_size
= sec
->size
;
7497 /* We are interested in just local symbols, not all
7499 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
7500 && (sec
->owner
->flags
& DYNAMIC
) == 0)
7504 if (elf_bad_symtab (sec
->owner
))
7505 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
7506 / bed
->s
->sizeof_sym
);
7508 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
7510 if (sym_count
> max_sym_count
)
7511 max_sym_count
= sym_count
;
7513 if (sym_count
> max_sym_shndx_count
7514 && elf_symtab_shndx (sec
->owner
) != 0)
7515 max_sym_shndx_count
= sym_count
;
7517 if ((sec
->flags
& SEC_RELOC
) != 0)
7521 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
7522 if (ext_size
> max_external_reloc_size
)
7523 max_external_reloc_size
= ext_size
;
7524 if (sec
->reloc_count
> max_internal_reloc_count
)
7525 max_internal_reloc_count
= sec
->reloc_count
;
7530 if (reloc_count
== 0)
7533 o
->reloc_count
+= reloc_count
;
7535 /* MIPS may have a mix of REL and RELA relocs on sections.
7536 To support this curious ABI we keep reloc counts in
7537 elf_section_data too. We must be careful to add the
7538 relocations from the input section to the right output
7539 count. FIXME: Get rid of one count. We have
7540 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
7541 rel_count1
= &esdo
->rel_count
;
7544 bfd_boolean same_size
;
7545 bfd_size_type entsize1
;
7547 entsize1
= esdi
->rel_hdr
.sh_entsize
;
7548 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
7549 || entsize1
== bed
->s
->sizeof_rela
);
7550 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
7553 rel_count1
= &esdo
->rel_count2
;
7555 if (esdi
->rel_hdr2
!= NULL
)
7557 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
7558 unsigned int alt_count
;
7559 unsigned int *rel_count2
;
7561 BFD_ASSERT (entsize2
!= entsize1
7562 && (entsize2
== bed
->s
->sizeof_rel
7563 || entsize2
== bed
->s
->sizeof_rela
));
7565 rel_count2
= &esdo
->rel_count2
;
7567 rel_count2
= &esdo
->rel_count
;
7569 /* The following is probably too simplistic if the
7570 backend counts output relocs unusually. */
7571 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
7572 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
7573 *rel_count2
+= alt_count
;
7574 reloc_count
-= alt_count
;
7577 *rel_count1
+= reloc_count
;
7580 if (o
->reloc_count
> 0)
7581 o
->flags
|= SEC_RELOC
;
7584 /* Explicitly clear the SEC_RELOC flag. The linker tends to
7585 set it (this is probably a bug) and if it is set
7586 assign_section_numbers will create a reloc section. */
7587 o
->flags
&=~ SEC_RELOC
;
7590 /* If the SEC_ALLOC flag is not set, force the section VMA to
7591 zero. This is done in elf_fake_sections as well, but forcing
7592 the VMA to 0 here will ensure that relocs against these
7593 sections are handled correctly. */
7594 if ((o
->flags
& SEC_ALLOC
) == 0
7595 && ! o
->user_set_vma
)
7599 if (! info
->relocatable
&& merged
)
7600 elf_link_hash_traverse (elf_hash_table (info
),
7601 _bfd_elf_link_sec_merge_syms
, abfd
);
7603 /* Figure out the file positions for everything but the symbol table
7604 and the relocs. We set symcount to force assign_section_numbers
7605 to create a symbol table. */
7606 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
7607 BFD_ASSERT (! abfd
->output_has_begun
);
7608 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
7611 /* That created the reloc sections. Set their sizes, and assign
7612 them file positions, and allocate some buffers. */
7613 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7615 if ((o
->flags
& SEC_RELOC
) != 0)
7617 if (!(_bfd_elf_link_size_reloc_section
7618 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
7621 if (elf_section_data (o
)->rel_hdr2
7622 && !(_bfd_elf_link_size_reloc_section
7623 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
7627 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
7628 to count upwards while actually outputting the relocations. */
7629 elf_section_data (o
)->rel_count
= 0;
7630 elf_section_data (o
)->rel_count2
= 0;
7633 _bfd_elf_assign_file_positions_for_relocs (abfd
);
7635 /* We have now assigned file positions for all the sections except
7636 .symtab and .strtab. We start the .symtab section at the current
7637 file position, and write directly to it. We build the .strtab
7638 section in memory. */
7639 bfd_get_symcount (abfd
) = 0;
7640 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
7641 /* sh_name is set in prep_headers. */
7642 symtab_hdr
->sh_type
= SHT_SYMTAB
;
7643 /* sh_flags, sh_addr and sh_size all start off zero. */
7644 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
7645 /* sh_link is set in assign_section_numbers. */
7646 /* sh_info is set below. */
7647 /* sh_offset is set just below. */
7648 symtab_hdr
->sh_addralign
= 1 << bed
->s
->log_file_align
;
7650 off
= elf_tdata (abfd
)->next_file_pos
;
7651 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
7653 /* Note that at this point elf_tdata (abfd)->next_file_pos is
7654 incorrect. We do not yet know the size of the .symtab section.
7655 We correct next_file_pos below, after we do know the size. */
7657 /* Allocate a buffer to hold swapped out symbols. This is to avoid
7658 continuously seeking to the right position in the file. */
7659 if (! info
->keep_memory
|| max_sym_count
< 20)
7660 finfo
.symbuf_size
= 20;
7662 finfo
.symbuf_size
= max_sym_count
;
7663 amt
= finfo
.symbuf_size
;
7664 amt
*= bed
->s
->sizeof_sym
;
7665 finfo
.symbuf
= bfd_malloc (amt
);
7666 if (finfo
.symbuf
== NULL
)
7668 if (elf_numsections (abfd
) > SHN_LORESERVE
)
7670 /* Wild guess at number of output symbols. realloc'd as needed. */
7671 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
7672 finfo
.shndxbuf_size
= amt
;
7673 amt
*= sizeof (Elf_External_Sym_Shndx
);
7674 finfo
.symshndxbuf
= bfd_zmalloc (amt
);
7675 if (finfo
.symshndxbuf
== NULL
)
7679 /* Start writing out the symbol table. The first symbol is always a
7681 if (info
->strip
!= strip_all
7684 elfsym
.st_value
= 0;
7687 elfsym
.st_other
= 0;
7688 elfsym
.st_shndx
= SHN_UNDEF
;
7689 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
7695 /* Some standard ELF linkers do this, but we don't because it causes
7696 bootstrap comparison failures. */
7697 /* Output a file symbol for the output file as the second symbol.
7698 We output this even if we are discarding local symbols, although
7699 I'm not sure if this is correct. */
7700 elfsym
.st_value
= 0;
7702 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
7703 elfsym
.st_other
= 0;
7704 elfsym
.st_shndx
= SHN_ABS
;
7705 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
7706 &elfsym
, bfd_abs_section_ptr
, NULL
))
7710 /* Output a symbol for each section. We output these even if we are
7711 discarding local symbols, since they are used for relocs. These
7712 symbols have no names. We store the index of each one in the
7713 index field of the section, so that we can find it again when
7714 outputting relocs. */
7715 if (info
->strip
!= strip_all
7719 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7720 elfsym
.st_other
= 0;
7721 for (i
= 1; i
< elf_numsections (abfd
); i
++)
7723 o
= bfd_section_from_elf_index (abfd
, i
);
7725 o
->target_index
= bfd_get_symcount (abfd
);
7726 elfsym
.st_shndx
= i
;
7727 if (info
->relocatable
|| o
== NULL
)
7728 elfsym
.st_value
= 0;
7730 elfsym
.st_value
= o
->vma
;
7731 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
))
7733 if (i
== SHN_LORESERVE
- 1)
7734 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
7738 /* Allocate some memory to hold information read in from the input
7740 if (max_contents_size
!= 0)
7742 finfo
.contents
= bfd_malloc (max_contents_size
);
7743 if (finfo
.contents
== NULL
)
7747 if (max_external_reloc_size
!= 0)
7749 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
7750 if (finfo
.external_relocs
== NULL
)
7754 if (max_internal_reloc_count
!= 0)
7756 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7757 amt
*= sizeof (Elf_Internal_Rela
);
7758 finfo
.internal_relocs
= bfd_malloc (amt
);
7759 if (finfo
.internal_relocs
== NULL
)
7763 if (max_sym_count
!= 0)
7765 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
7766 finfo
.external_syms
= bfd_malloc (amt
);
7767 if (finfo
.external_syms
== NULL
)
7770 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
7771 finfo
.internal_syms
= bfd_malloc (amt
);
7772 if (finfo
.internal_syms
== NULL
)
7775 amt
= max_sym_count
* sizeof (long);
7776 finfo
.indices
= bfd_malloc (amt
);
7777 if (finfo
.indices
== NULL
)
7780 amt
= max_sym_count
* sizeof (asection
*);
7781 finfo
.sections
= bfd_malloc (amt
);
7782 if (finfo
.sections
== NULL
)
7786 if (max_sym_shndx_count
!= 0)
7788 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
7789 finfo
.locsym_shndx
= bfd_malloc (amt
);
7790 if (finfo
.locsym_shndx
== NULL
)
7794 if (elf_hash_table (info
)->tls_sec
)
7796 bfd_vma base
, end
= 0;
7799 for (sec
= elf_hash_table (info
)->tls_sec
;
7800 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
7803 bfd_vma size
= sec
->size
;
7805 if (size
== 0 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
7807 struct bfd_link_order
*o
;
7809 for (o
= sec
->link_order_head
; o
!= NULL
; o
= o
->next
)
7810 if (size
< o
->offset
+ o
->size
)
7811 size
= o
->offset
+ o
->size
;
7813 end
= sec
->vma
+ size
;
7815 base
= elf_hash_table (info
)->tls_sec
->vma
;
7816 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
7817 elf_hash_table (info
)->tls_size
= end
- base
;
7820 /* Reorder SHF_LINK_ORDER sections. */
7821 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7823 if (!elf_fixup_link_order (abfd
, o
))
7827 /* Since ELF permits relocations to be against local symbols, we
7828 must have the local symbols available when we do the relocations.
7829 Since we would rather only read the local symbols once, and we
7830 would rather not keep them in memory, we handle all the
7831 relocations for a single input file at the same time.
7833 Unfortunately, there is no way to know the total number of local
7834 symbols until we have seen all of them, and the local symbol
7835 indices precede the global symbol indices. This means that when
7836 we are generating relocatable output, and we see a reloc against
7837 a global symbol, we can not know the symbol index until we have
7838 finished examining all the local symbols to see which ones we are
7839 going to output. To deal with this, we keep the relocations in
7840 memory, and don't output them until the end of the link. This is
7841 an unfortunate waste of memory, but I don't see a good way around
7842 it. Fortunately, it only happens when performing a relocatable
7843 link, which is not the common case. FIXME: If keep_memory is set
7844 we could write the relocs out and then read them again; I don't
7845 know how bad the memory loss will be. */
7847 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7848 sub
->output_has_begun
= FALSE
;
7849 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7851 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7853 if (p
->type
== bfd_indirect_link_order
7854 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
7855 == bfd_target_elf_flavour
)
7856 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
7858 if (! sub
->output_has_begun
)
7860 if (! elf_link_input_bfd (&finfo
, sub
))
7862 sub
->output_has_begun
= TRUE
;
7865 else if (p
->type
== bfd_section_reloc_link_order
7866 || p
->type
== bfd_symbol_reloc_link_order
)
7868 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
7873 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
7879 /* Output any global symbols that got converted to local in a
7880 version script or due to symbol visibility. We do this in a
7881 separate step since ELF requires all local symbols to appear
7882 prior to any global symbols. FIXME: We should only do this if
7883 some global symbols were, in fact, converted to become local.
7884 FIXME: Will this work correctly with the Irix 5 linker? */
7885 eoinfo
.failed
= FALSE
;
7886 eoinfo
.finfo
= &finfo
;
7887 eoinfo
.localsyms
= TRUE
;
7888 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
7893 /* That wrote out all the local symbols. Finish up the symbol table
7894 with the global symbols. Even if we want to strip everything we
7895 can, we still need to deal with those global symbols that got
7896 converted to local in a version script. */
7898 /* The sh_info field records the index of the first non local symbol. */
7899 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
7902 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
7904 Elf_Internal_Sym sym
;
7905 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
7906 long last_local
= 0;
7908 /* Write out the section symbols for the output sections. */
7915 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7918 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
7924 dynindx
= elf_section_data (s
)->dynindx
;
7927 indx
= elf_section_data (s
)->this_idx
;
7928 BFD_ASSERT (indx
> 0);
7929 sym
.st_shndx
= indx
;
7930 sym
.st_value
= s
->vma
;
7931 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
7932 if (last_local
< dynindx
)
7933 last_local
= dynindx
;
7934 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
7938 /* Write out the local dynsyms. */
7939 if (elf_hash_table (info
)->dynlocal
)
7941 struct elf_link_local_dynamic_entry
*e
;
7942 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
7947 sym
.st_size
= e
->isym
.st_size
;
7948 sym
.st_other
= e
->isym
.st_other
;
7950 /* Copy the internal symbol as is.
7951 Note that we saved a word of storage and overwrote
7952 the original st_name with the dynstr_index. */
7955 if (e
->isym
.st_shndx
!= SHN_UNDEF
7956 && (e
->isym
.st_shndx
< SHN_LORESERVE
7957 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
7959 s
= bfd_section_from_elf_index (e
->input_bfd
,
7963 elf_section_data (s
->output_section
)->this_idx
;
7964 sym
.st_value
= (s
->output_section
->vma
7966 + e
->isym
.st_value
);
7969 if (last_local
< e
->dynindx
)
7970 last_local
= e
->dynindx
;
7972 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
7973 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
7977 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
7981 /* We get the global symbols from the hash table. */
7982 eoinfo
.failed
= FALSE
;
7983 eoinfo
.localsyms
= FALSE
;
7984 eoinfo
.finfo
= &finfo
;
7985 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
7990 /* If backend needs to output some symbols not present in the hash
7991 table, do it now. */
7992 if (bed
->elf_backend_output_arch_syms
)
7994 typedef bfd_boolean (*out_sym_func
)
7995 (void *, const char *, Elf_Internal_Sym
*, asection
*,
7996 struct elf_link_hash_entry
*);
7998 if (! ((*bed
->elf_backend_output_arch_syms
)
7999 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
8003 /* Flush all symbols to the file. */
8004 if (! elf_link_flush_output_syms (&finfo
, bed
))
8007 /* Now we know the size of the symtab section. */
8008 off
+= symtab_hdr
->sh_size
;
8010 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
8011 if (symtab_shndx_hdr
->sh_name
!= 0)
8013 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
8014 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
8015 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
8016 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
8017 symtab_shndx_hdr
->sh_size
= amt
;
8019 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
8022 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
8023 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
8028 /* Finish up and write out the symbol string table (.strtab)
8030 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
8031 /* sh_name was set in prep_headers. */
8032 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
8033 symstrtab_hdr
->sh_flags
= 0;
8034 symstrtab_hdr
->sh_addr
= 0;
8035 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
8036 symstrtab_hdr
->sh_entsize
= 0;
8037 symstrtab_hdr
->sh_link
= 0;
8038 symstrtab_hdr
->sh_info
= 0;
8039 /* sh_offset is set just below. */
8040 symstrtab_hdr
->sh_addralign
= 1;
8042 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
8043 elf_tdata (abfd
)->next_file_pos
= off
;
8045 if (bfd_get_symcount (abfd
) > 0)
8047 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
8048 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
8052 /* Adjust the relocs to have the correct symbol indices. */
8053 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8055 if ((o
->flags
& SEC_RELOC
) == 0)
8058 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
8059 elf_section_data (o
)->rel_count
,
8060 elf_section_data (o
)->rel_hashes
);
8061 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
8062 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
8063 elf_section_data (o
)->rel_count2
,
8064 (elf_section_data (o
)->rel_hashes
8065 + elf_section_data (o
)->rel_count
));
8067 /* Set the reloc_count field to 0 to prevent write_relocs from
8068 trying to swap the relocs out itself. */
8072 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
8073 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
8075 /* If we are linking against a dynamic object, or generating a
8076 shared library, finish up the dynamic linking information. */
8079 bfd_byte
*dyncon
, *dynconend
;
8081 /* Fix up .dynamic entries. */
8082 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
8083 BFD_ASSERT (o
!= NULL
);
8085 dyncon
= o
->contents
;
8086 dynconend
= o
->contents
+ o
->size
;
8087 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
8089 Elf_Internal_Dyn dyn
;
8093 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
8100 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
8102 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
8104 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
8105 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
8108 dyn
.d_un
.d_val
= relativecount
;
8115 name
= info
->init_function
;
8118 name
= info
->fini_function
;
8121 struct elf_link_hash_entry
*h
;
8123 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
8124 FALSE
, FALSE
, TRUE
);
8126 && (h
->root
.type
== bfd_link_hash_defined
8127 || h
->root
.type
== bfd_link_hash_defweak
))
8129 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
8130 o
= h
->root
.u
.def
.section
;
8131 if (o
->output_section
!= NULL
)
8132 dyn
.d_un
.d_val
+= (o
->output_section
->vma
8133 + o
->output_offset
);
8136 /* The symbol is imported from another shared
8137 library and does not apply to this one. */
8145 case DT_PREINIT_ARRAYSZ
:
8146 name
= ".preinit_array";
8148 case DT_INIT_ARRAYSZ
:
8149 name
= ".init_array";
8151 case DT_FINI_ARRAYSZ
:
8152 name
= ".fini_array";
8154 o
= bfd_get_section_by_name (abfd
, name
);
8157 (*_bfd_error_handler
)
8158 (_("%s: could not find output section %s"),
8159 bfd_get_filename (abfd
), name
);
8163 (*_bfd_error_handler
)
8164 (_("warning: %s section has zero size"), name
);
8165 dyn
.d_un
.d_val
= o
->size
;
8168 case DT_PREINIT_ARRAY
:
8169 name
= ".preinit_array";
8172 name
= ".init_array";
8175 name
= ".fini_array";
8188 name
= ".gnu.version_d";
8191 name
= ".gnu.version_r";
8194 name
= ".gnu.version";
8196 o
= bfd_get_section_by_name (abfd
, name
);
8199 (*_bfd_error_handler
)
8200 (_("%s: could not find output section %s"),
8201 bfd_get_filename (abfd
), name
);
8204 dyn
.d_un
.d_ptr
= o
->vma
;
8211 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
8216 for (i
= 1; i
< elf_numsections (abfd
); i
++)
8218 Elf_Internal_Shdr
*hdr
;
8220 hdr
= elf_elfsections (abfd
)[i
];
8221 if (hdr
->sh_type
== type
8222 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
8224 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
8225 dyn
.d_un
.d_val
+= hdr
->sh_size
;
8228 if (dyn
.d_un
.d_val
== 0
8229 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
8230 dyn
.d_un
.d_val
= hdr
->sh_addr
;
8236 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
8240 /* If we have created any dynamic sections, then output them. */
8243 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
8246 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
8248 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
8250 || o
->output_section
== bfd_abs_section_ptr
)
8252 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
8254 /* At this point, we are only interested in sections
8255 created by _bfd_elf_link_create_dynamic_sections. */
8258 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
8260 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
8262 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
8264 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
8266 if (! bfd_set_section_contents (abfd
, o
->output_section
,
8268 (file_ptr
) o
->output_offset
,
8274 /* The contents of the .dynstr section are actually in a
8276 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
8277 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
8278 || ! _bfd_elf_strtab_emit (abfd
,
8279 elf_hash_table (info
)->dynstr
))
8285 if (info
->relocatable
)
8287 bfd_boolean failed
= FALSE
;
8289 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
8294 /* If we have optimized stabs strings, output them. */
8295 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
8297 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
8301 if (info
->eh_frame_hdr
)
8303 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
8307 if (finfo
.symstrtab
!= NULL
)
8308 _bfd_stringtab_free (finfo
.symstrtab
);
8309 if (finfo
.contents
!= NULL
)
8310 free (finfo
.contents
);
8311 if (finfo
.external_relocs
!= NULL
)
8312 free (finfo
.external_relocs
);
8313 if (finfo
.internal_relocs
!= NULL
)
8314 free (finfo
.internal_relocs
);
8315 if (finfo
.external_syms
!= NULL
)
8316 free (finfo
.external_syms
);
8317 if (finfo
.locsym_shndx
!= NULL
)
8318 free (finfo
.locsym_shndx
);
8319 if (finfo
.internal_syms
!= NULL
)
8320 free (finfo
.internal_syms
);
8321 if (finfo
.indices
!= NULL
)
8322 free (finfo
.indices
);
8323 if (finfo
.sections
!= NULL
)
8324 free (finfo
.sections
);
8325 if (finfo
.symbuf
!= NULL
)
8326 free (finfo
.symbuf
);
8327 if (finfo
.symshndxbuf
!= NULL
)
8328 free (finfo
.symshndxbuf
);
8329 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8331 if ((o
->flags
& SEC_RELOC
) != 0
8332 && elf_section_data (o
)->rel_hashes
!= NULL
)
8333 free (elf_section_data (o
)->rel_hashes
);
8336 elf_tdata (abfd
)->linker
= TRUE
;
8341 if (finfo
.symstrtab
!= NULL
)
8342 _bfd_stringtab_free (finfo
.symstrtab
);
8343 if (finfo
.contents
!= NULL
)
8344 free (finfo
.contents
);
8345 if (finfo
.external_relocs
!= NULL
)
8346 free (finfo
.external_relocs
);
8347 if (finfo
.internal_relocs
!= NULL
)
8348 free (finfo
.internal_relocs
);
8349 if (finfo
.external_syms
!= NULL
)
8350 free (finfo
.external_syms
);
8351 if (finfo
.locsym_shndx
!= NULL
)
8352 free (finfo
.locsym_shndx
);
8353 if (finfo
.internal_syms
!= NULL
)
8354 free (finfo
.internal_syms
);
8355 if (finfo
.indices
!= NULL
)
8356 free (finfo
.indices
);
8357 if (finfo
.sections
!= NULL
)
8358 free (finfo
.sections
);
8359 if (finfo
.symbuf
!= NULL
)
8360 free (finfo
.symbuf
);
8361 if (finfo
.symshndxbuf
!= NULL
)
8362 free (finfo
.symshndxbuf
);
8363 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8365 if ((o
->flags
& SEC_RELOC
) != 0
8366 && elf_section_data (o
)->rel_hashes
!= NULL
)
8367 free (elf_section_data (o
)->rel_hashes
);
8373 /* Garbage collect unused sections. */
8375 /* The mark phase of garbage collection. For a given section, mark
8376 it and any sections in this section's group, and all the sections
8377 which define symbols to which it refers. */
8379 typedef asection
* (*gc_mark_hook_fn
)
8380 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8381 struct elf_link_hash_entry
*, Elf_Internal_Sym
*);
8384 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
8386 gc_mark_hook_fn gc_mark_hook
)
8389 asection
*group_sec
;
8393 /* Mark all the sections in the group. */
8394 group_sec
= elf_section_data (sec
)->next_in_group
;
8395 if (group_sec
&& !group_sec
->gc_mark
)
8396 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
8399 /* Look through the section relocs. */
8401 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
8403 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
8404 Elf_Internal_Shdr
*symtab_hdr
;
8405 struct elf_link_hash_entry
**sym_hashes
;
8408 bfd
*input_bfd
= sec
->owner
;
8409 const struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
8410 Elf_Internal_Sym
*isym
= NULL
;
8413 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
8414 sym_hashes
= elf_sym_hashes (input_bfd
);
8416 /* Read the local symbols. */
8417 if (elf_bad_symtab (input_bfd
))
8419 nlocsyms
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8423 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
8425 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8426 if (isym
== NULL
&& nlocsyms
!= 0)
8428 isym
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, nlocsyms
, 0,
8434 /* Read the relocations. */
8435 relstart
= _bfd_elf_link_read_relocs (input_bfd
, sec
, NULL
, NULL
,
8437 if (relstart
== NULL
)
8442 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8444 if (bed
->s
->arch_size
== 32)
8449 for (rel
= relstart
; rel
< relend
; rel
++)
8451 unsigned long r_symndx
;
8453 struct elf_link_hash_entry
*h
;
8455 r_symndx
= rel
->r_info
>> r_sym_shift
;
8459 if (r_symndx
>= nlocsyms
8460 || ELF_ST_BIND (isym
[r_symndx
].st_info
) != STB_LOCAL
)
8462 h
= sym_hashes
[r_symndx
- extsymoff
];
8463 while (h
->root
.type
== bfd_link_hash_indirect
8464 || h
->root
.type
== bfd_link_hash_warning
)
8465 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8466 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, h
, NULL
);
8470 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, NULL
, &isym
[r_symndx
]);
8473 if (rsec
&& !rsec
->gc_mark
)
8475 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
8477 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
8486 if (elf_section_data (sec
)->relocs
!= relstart
)
8489 if (isym
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isym
)
8491 if (! info
->keep_memory
)
8494 symtab_hdr
->contents
= (unsigned char *) isym
;
8501 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
8504 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *idxptr
)
8508 if (h
->root
.type
== bfd_link_hash_warning
)
8509 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8511 if (h
->dynindx
!= -1
8512 && ((h
->root
.type
!= bfd_link_hash_defined
8513 && h
->root
.type
!= bfd_link_hash_defweak
)
8514 || h
->root
.u
.def
.section
->gc_mark
))
8515 h
->dynindx
= (*idx
)++;
8520 /* The sweep phase of garbage collection. Remove all garbage sections. */
8522 typedef bfd_boolean (*gc_sweep_hook_fn
)
8523 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
8526 elf_gc_sweep (struct bfd_link_info
*info
, gc_sweep_hook_fn gc_sweep_hook
)
8530 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8534 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8537 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8539 /* Keep special sections. Keep .debug sections. */
8540 if ((o
->flags
& SEC_LINKER_CREATED
)
8541 || (o
->flags
& SEC_DEBUGGING
))
8547 /* Skip sweeping sections already excluded. */
8548 if (o
->flags
& SEC_EXCLUDE
)
8551 /* Since this is early in the link process, it is simple
8552 to remove a section from the output. */
8553 o
->flags
|= SEC_EXCLUDE
;
8555 /* But we also have to update some of the relocation
8556 info we collected before. */
8558 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
8560 Elf_Internal_Rela
*internal_relocs
;
8564 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
8566 if (internal_relocs
== NULL
)
8569 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
8571 if (elf_section_data (o
)->relocs
!= internal_relocs
)
8572 free (internal_relocs
);
8580 /* Remove the symbols that were in the swept sections from the dynamic
8581 symbol table. GCFIXME: Anyone know how to get them out of the
8582 static symbol table as well? */
8586 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
, &i
);
8588 elf_hash_table (info
)->dynsymcount
= i
;
8594 /* Propagate collected vtable information. This is called through
8595 elf_link_hash_traverse. */
8598 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
8600 if (h
->root
.type
== bfd_link_hash_warning
)
8601 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8603 /* Those that are not vtables. */
8604 if (h
->vtable_parent
== NULL
)
8607 /* Those vtables that do not have parents, we cannot merge. */
8608 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
8611 /* If we've already been done, exit. */
8612 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
8615 /* Make sure the parent's table is up to date. */
8616 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
8618 if (h
->vtable_entries_used
== NULL
)
8620 /* None of this table's entries were referenced. Re-use the
8622 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
8623 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
8628 bfd_boolean
*cu
, *pu
;
8630 /* Or the parent's entries into ours. */
8631 cu
= h
->vtable_entries_used
;
8633 pu
= h
->vtable_parent
->vtable_entries_used
;
8636 const struct elf_backend_data
*bed
;
8637 unsigned int log_file_align
;
8639 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
8640 log_file_align
= bed
->s
->log_file_align
;
8641 n
= h
->vtable_parent
->vtable_entries_size
>> log_file_align
;
8656 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
8659 bfd_vma hstart
, hend
;
8660 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
8661 const struct elf_backend_data
*bed
;
8662 unsigned int log_file_align
;
8664 if (h
->root
.type
== bfd_link_hash_warning
)
8665 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8667 /* Take care of both those symbols that do not describe vtables as
8668 well as those that are not loaded. */
8669 if (h
->vtable_parent
== NULL
)
8672 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
8673 || h
->root
.type
== bfd_link_hash_defweak
);
8675 sec
= h
->root
.u
.def
.section
;
8676 hstart
= h
->root
.u
.def
.value
;
8677 hend
= hstart
+ h
->size
;
8679 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
8681 return *(bfd_boolean
*) okp
= FALSE
;
8682 bed
= get_elf_backend_data (sec
->owner
);
8683 log_file_align
= bed
->s
->log_file_align
;
8685 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8687 for (rel
= relstart
; rel
< relend
; ++rel
)
8688 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
8690 /* If the entry is in use, do nothing. */
8691 if (h
->vtable_entries_used
8692 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
8694 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
8695 if (h
->vtable_entries_used
[entry
])
8698 /* Otherwise, kill it. */
8699 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
8705 /* Mark sections containing dynamically referenced symbols. This is called
8706 through elf_link_hash_traverse. */
8709 elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
,
8710 void *okp ATTRIBUTE_UNUSED
)
8712 if (h
->root
.type
== bfd_link_hash_warning
)
8713 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8715 if ((h
->root
.type
== bfd_link_hash_defined
8716 || h
->root
.type
== bfd_link_hash_defweak
)
8717 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
))
8718 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
8723 /* Do mark and sweep of unused sections. */
8726 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
8728 bfd_boolean ok
= TRUE
;
8730 asection
* (*gc_mark_hook
)
8731 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8732 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*);
8734 if (!get_elf_backend_data (abfd
)->can_gc_sections
8735 || info
->relocatable
8736 || info
->emitrelocations
8738 || !is_elf_hash_table (info
->hash
))
8740 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
8744 /* Apply transitive closure to the vtable entry usage info. */
8745 elf_link_hash_traverse (elf_hash_table (info
),
8746 elf_gc_propagate_vtable_entries_used
,
8751 /* Kill the vtable relocations that were not used. */
8752 elf_link_hash_traverse (elf_hash_table (info
),
8753 elf_gc_smash_unused_vtentry_relocs
,
8758 /* Mark dynamically referenced symbols. */
8759 if (elf_hash_table (info
)->dynamic_sections_created
)
8760 elf_link_hash_traverse (elf_hash_table (info
),
8761 elf_gc_mark_dynamic_ref_symbol
,
8766 /* Grovel through relocs to find out who stays ... */
8767 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
8768 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8772 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8775 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8777 if (o
->flags
& SEC_KEEP
)
8779 /* _bfd_elf_discard_section_eh_frame knows how to discard
8780 orphaned FDEs so don't mark sections referenced by the
8781 EH frame section. */
8782 if (strcmp (o
->name
, ".eh_frame") == 0)
8784 else if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
8790 /* ... and mark SEC_EXCLUDE for those that go. */
8791 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
8797 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
8800 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
8802 struct elf_link_hash_entry
*h
,
8805 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
8806 struct elf_link_hash_entry
**search
, *child
;
8807 bfd_size_type extsymcount
;
8808 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8811 /* The sh_info field of the symtab header tells us where the
8812 external symbols start. We don't care about the local symbols at
8814 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
8815 if (!elf_bad_symtab (abfd
))
8816 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
8818 sym_hashes
= elf_sym_hashes (abfd
);
8819 sym_hashes_end
= sym_hashes
+ extsymcount
;
8821 /* Hunt down the child symbol, which is in this section at the same
8822 offset as the relocation. */
8823 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
8825 if ((child
= *search
) != NULL
8826 && (child
->root
.type
== bfd_link_hash_defined
8827 || child
->root
.type
== bfd_link_hash_defweak
)
8828 && child
->root
.u
.def
.section
== sec
8829 && child
->root
.u
.def
.value
== offset
)
8833 sec_name
= bfd_get_section_ident (sec
);
8834 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
8835 bfd_archive_filename (abfd
),
8836 sec_name
? sec_name
: sec
->name
,
8837 (unsigned long) offset
);
8838 bfd_set_error (bfd_error_invalid_operation
);
8844 /* This *should* only be the absolute section. It could potentially
8845 be that someone has defined a non-global vtable though, which
8846 would be bad. It isn't worth paging in the local symbols to be
8847 sure though; that case should simply be handled by the assembler. */
8849 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
8852 child
->vtable_parent
= h
;
8857 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
8860 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
8861 asection
*sec ATTRIBUTE_UNUSED
,
8862 struct elf_link_hash_entry
*h
,
8865 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8866 unsigned int log_file_align
= bed
->s
->log_file_align
;
8868 if (addend
>= h
->vtable_entries_size
)
8870 size_t size
, bytes
, file_align
;
8871 bfd_boolean
*ptr
= h
->vtable_entries_used
;
8873 /* While the symbol is undefined, we have to be prepared to handle
8875 file_align
= 1 << log_file_align
;
8876 if (h
->root
.type
== bfd_link_hash_undefined
)
8877 size
= addend
+ file_align
;
8883 /* Oops! We've got a reference past the defined end of
8884 the table. This is probably a bug -- shall we warn? */
8885 size
= addend
+ file_align
;
8888 size
= (size
+ file_align
- 1) & -file_align
;
8890 /* Allocate one extra entry for use as a "done" flag for the
8891 consolidation pass. */
8892 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
8896 ptr
= bfd_realloc (ptr
- 1, bytes
);
8902 oldbytes
= (((h
->vtable_entries_size
>> log_file_align
) + 1)
8903 * sizeof (bfd_boolean
));
8904 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
8908 ptr
= bfd_zmalloc (bytes
);
8913 /* And arrange for that done flag to be at index -1. */
8914 h
->vtable_entries_used
= ptr
+ 1;
8915 h
->vtable_entries_size
= size
;
8918 h
->vtable_entries_used
[addend
>> log_file_align
] = TRUE
;
8923 struct alloc_got_off_arg
{
8925 unsigned int got_elt_size
;
8928 /* We need a special top-level link routine to convert got reference counts
8929 to real got offsets. */
8932 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
8934 struct alloc_got_off_arg
*gofarg
= arg
;
8936 if (h
->root
.type
== bfd_link_hash_warning
)
8937 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8939 if (h
->got
.refcount
> 0)
8941 h
->got
.offset
= gofarg
->gotoff
;
8942 gofarg
->gotoff
+= gofarg
->got_elt_size
;
8945 h
->got
.offset
= (bfd_vma
) -1;
8950 /* And an accompanying bit to work out final got entry offsets once
8951 we're done. Should be called from final_link. */
8954 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
8955 struct bfd_link_info
*info
)
8958 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8960 unsigned int got_elt_size
= bed
->s
->arch_size
/ 8;
8961 struct alloc_got_off_arg gofarg
;
8963 if (! is_elf_hash_table (info
->hash
))
8966 /* The GOT offset is relative to the .got section, but the GOT header is
8967 put into the .got.plt section, if the backend uses it. */
8968 if (bed
->want_got_plt
)
8971 gotoff
= bed
->got_header_size
;
8973 /* Do the local .got entries first. */
8974 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
8976 bfd_signed_vma
*local_got
;
8977 bfd_size_type j
, locsymcount
;
8978 Elf_Internal_Shdr
*symtab_hdr
;
8980 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
8983 local_got
= elf_local_got_refcounts (i
);
8987 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
8988 if (elf_bad_symtab (i
))
8989 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8991 locsymcount
= symtab_hdr
->sh_info
;
8993 for (j
= 0; j
< locsymcount
; ++j
)
8995 if (local_got
[j
] > 0)
8997 local_got
[j
] = gotoff
;
8998 gotoff
+= got_elt_size
;
9001 local_got
[j
] = (bfd_vma
) -1;
9005 /* Then the global .got entries. .plt refcounts are handled by
9006 adjust_dynamic_symbol */
9007 gofarg
.gotoff
= gotoff
;
9008 gofarg
.got_elt_size
= got_elt_size
;
9009 elf_link_hash_traverse (elf_hash_table (info
),
9010 elf_gc_allocate_got_offsets
,
9015 /* Many folk need no more in the way of final link than this, once
9016 got entry reference counting is enabled. */
9019 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
9021 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
9024 /* Invoke the regular ELF backend linker to do all the work. */
9025 return bfd_elf_final_link (abfd
, info
);
9029 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
9031 struct elf_reloc_cookie
*rcookie
= cookie
;
9033 if (rcookie
->bad_symtab
)
9034 rcookie
->rel
= rcookie
->rels
;
9036 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
9038 unsigned long r_symndx
;
9040 if (! rcookie
->bad_symtab
)
9041 if (rcookie
->rel
->r_offset
> offset
)
9043 if (rcookie
->rel
->r_offset
!= offset
)
9046 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
9047 if (r_symndx
== SHN_UNDEF
)
9050 if (r_symndx
>= rcookie
->locsymcount
9051 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
9053 struct elf_link_hash_entry
*h
;
9055 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
9057 while (h
->root
.type
== bfd_link_hash_indirect
9058 || h
->root
.type
== bfd_link_hash_warning
)
9059 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9061 if ((h
->root
.type
== bfd_link_hash_defined
9062 || h
->root
.type
== bfd_link_hash_defweak
)
9063 && elf_discarded_section (h
->root
.u
.def
.section
))
9070 /* It's not a relocation against a global symbol,
9071 but it could be a relocation against a local
9072 symbol for a discarded section. */
9074 Elf_Internal_Sym
*isym
;
9076 /* Need to: get the symbol; get the section. */
9077 isym
= &rcookie
->locsyms
[r_symndx
];
9078 if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
9080 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
9081 if (isec
!= NULL
&& elf_discarded_section (isec
))
9090 /* Discard unneeded references to discarded sections.
9091 Returns TRUE if any section's size was changed. */
9092 /* This function assumes that the relocations are in sorted order,
9093 which is true for all known assemblers. */
9096 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
9098 struct elf_reloc_cookie cookie
;
9099 asection
*stab
, *eh
;
9100 Elf_Internal_Shdr
*symtab_hdr
;
9101 const struct elf_backend_data
*bed
;
9104 bfd_boolean ret
= FALSE
;
9106 if (info
->traditional_format
9107 || !is_elf_hash_table (info
->hash
))
9110 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
9112 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
9115 bed
= get_elf_backend_data (abfd
);
9117 if ((abfd
->flags
& DYNAMIC
) != 0)
9120 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
9121 if (info
->relocatable
9124 || bfd_is_abs_section (eh
->output_section
))))
9127 stab
= bfd_get_section_by_name (abfd
, ".stab");
9130 || bfd_is_abs_section (stab
->output_section
)
9131 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
9136 && bed
->elf_backend_discard_info
== NULL
)
9139 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9141 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
9142 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
9143 if (cookie
.bad_symtab
)
9145 cookie
.locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9146 cookie
.extsymoff
= 0;
9150 cookie
.locsymcount
= symtab_hdr
->sh_info
;
9151 cookie
.extsymoff
= symtab_hdr
->sh_info
;
9154 if (bed
->s
->arch_size
== 32)
9155 cookie
.r_sym_shift
= 8;
9157 cookie
.r_sym_shift
= 32;
9159 cookie
.locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9160 if (cookie
.locsyms
== NULL
&& cookie
.locsymcount
!= 0)
9162 cookie
.locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
9163 cookie
.locsymcount
, 0,
9165 if (cookie
.locsyms
== NULL
)
9172 count
= stab
->reloc_count
;
9174 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, stab
, NULL
, NULL
,
9176 if (cookie
.rels
!= NULL
)
9178 cookie
.rel
= cookie
.rels
;
9179 cookie
.relend
= cookie
.rels
;
9180 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
9181 if (_bfd_discard_section_stabs (abfd
, stab
,
9182 elf_section_data (stab
)->sec_info
,
9183 bfd_elf_reloc_symbol_deleted_p
,
9186 if (elf_section_data (stab
)->relocs
!= cookie
.rels
)
9194 count
= eh
->reloc_count
;
9196 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, eh
, NULL
, NULL
,
9198 cookie
.rel
= cookie
.rels
;
9199 cookie
.relend
= cookie
.rels
;
9200 if (cookie
.rels
!= NULL
)
9201 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
9203 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
9204 bfd_elf_reloc_symbol_deleted_p
,
9208 if (cookie
.rels
!= NULL
9209 && elf_section_data (eh
)->relocs
!= cookie
.rels
)
9213 if (bed
->elf_backend_discard_info
!= NULL
9214 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
9217 if (cookie
.locsyms
!= NULL
9218 && symtab_hdr
->contents
!= (unsigned char *) cookie
.locsyms
)
9220 if (! info
->keep_memory
)
9221 free (cookie
.locsyms
);
9223 symtab_hdr
->contents
= (unsigned char *) cookie
.locsyms
;
9227 if (info
->eh_frame_hdr
9228 && !info
->relocatable
9229 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
9235 struct already_linked_section
9241 /* Check if the member of a single member comdat group matches a
9242 linkonce section and vice versa. */
9244 try_match_symbols_in_sections
9245 (struct bfd_section_already_linked_hash_entry
*h
, void *info
)
9247 struct bfd_section_already_linked
*l
;
9248 struct already_linked_section
*s
9249 = (struct already_linked_section
*) info
;
9251 if (elf_sec_group (s
->sec
) == NULL
)
9253 /* It is a linkonce section. Try to match it with the member of a
9254 single member comdat group. */
9255 for (l
= h
->entry
; l
!= NULL
; l
= l
->next
)
9256 if ((l
->sec
->flags
& SEC_GROUP
))
9258 asection
*first
= elf_next_in_group (l
->sec
);
9261 && elf_next_in_group (first
) == first
9262 && bfd_elf_match_symbols_in_sections (first
, s
->sec
))
9271 /* It is the member of a single member comdat group. Try to match
9272 it with a linkonce section. */
9273 for (l
= h
->entry
; l
!= NULL
; l
= l
->next
)
9274 if ((l
->sec
->flags
& SEC_GROUP
) == 0
9275 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
9276 && bfd_elf_match_symbols_in_sections (l
->sec
, s
->sec
))
9287 already_linked (asection
*sec
, asection
*group
)
9289 struct already_linked_section result
;
9292 result
.linked
= NULL
;
9294 bfd_section_already_linked_table_traverse
9295 (try_match_symbols_in_sections
, &result
);
9299 sec
->output_section
= bfd_abs_section_ptr
;
9300 sec
->kept_section
= result
.linked
;
9302 /* Also discard the group section. */
9304 group
->output_section
= bfd_abs_section_ptr
;
9313 _bfd_elf_section_already_linked (bfd
*abfd
, struct bfd_section
* sec
)
9317 struct bfd_section_already_linked
*l
;
9318 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
9321 /* A single member comdat group section may be discarded by a
9322 linkonce section. See below. */
9323 if (sec
->output_section
== bfd_abs_section_ptr
)
9328 /* Check if it belongs to a section group. */
9329 group
= elf_sec_group (sec
);
9331 /* Return if it isn't a linkonce section nor a member of a group. A
9332 comdat group section also has SEC_LINK_ONCE set. */
9333 if ((flags
& SEC_LINK_ONCE
) == 0 && group
== NULL
)
9338 /* If this is the member of a single member comdat group, check if
9339 the group should be discarded. */
9340 if (elf_next_in_group (sec
) == sec
9341 && (group
->flags
& SEC_LINK_ONCE
) != 0)
9347 /* FIXME: When doing a relocatable link, we may have trouble
9348 copying relocations in other sections that refer to local symbols
9349 in the section being discarded. Those relocations will have to
9350 be converted somehow; as of this writing I'm not sure that any of
9351 the backends handle that correctly.
9353 It is tempting to instead not discard link once sections when
9354 doing a relocatable link (technically, they should be discarded
9355 whenever we are building constructors). However, that fails,
9356 because the linker winds up combining all the link once sections
9357 into a single large link once section, which defeats the purpose
9358 of having link once sections in the first place.
9360 Also, not merging link once sections in a relocatable link
9361 causes trouble for MIPS ELF, which relies on link once semantics
9362 to handle the .reginfo section correctly. */
9364 name
= bfd_get_section_name (abfd
, sec
);
9366 already_linked_list
= bfd_section_already_linked_table_lookup (name
);
9368 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
9370 /* We may have 3 different sections on the list: group section,
9371 comdat section and linkonce section. SEC may be a linkonce or
9372 group section. We match a group section with a group section,
9373 a linkonce section with a linkonce section, and ignore comdat
9375 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
9376 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
9378 /* The section has already been linked. See if we should
9380 switch (flags
& SEC_LINK_DUPLICATES
)
9385 case SEC_LINK_DUPLICATES_DISCARD
:
9388 case SEC_LINK_DUPLICATES_ONE_ONLY
:
9389 (*_bfd_error_handler
)
9390 (_("%s: %s: warning: ignoring duplicate section `%s'\n"),
9391 bfd_archive_filename (abfd
), name
);
9394 case SEC_LINK_DUPLICATES_SAME_SIZE
:
9395 if (sec
->size
!= l
->sec
->size
)
9396 (*_bfd_error_handler
)
9397 (_("%s: %s: warning: duplicate section `%s' has different size\n"),
9398 bfd_archive_filename (abfd
), name
);
9402 /* Set the output_section field so that lang_add_section
9403 does not create a lang_input_section structure for this
9404 section. Since there might be a symbol in the section
9405 being discarded, we must retain a pointer to the section
9406 which we are really going to use. */
9407 sec
->output_section
= bfd_abs_section_ptr
;
9408 sec
->kept_section
= l
->sec
;
9410 if (flags
& SEC_GROUP
)
9412 asection
*first
= elf_next_in_group (sec
);
9413 asection
*s
= first
;
9417 s
->output_section
= bfd_abs_section_ptr
;
9418 /* Record which group discards it. */
9419 s
->kept_section
= l
->sec
;
9420 s
= elf_next_in_group (s
);
9421 /* These lists are circular. */
9433 /* If this is the member of a single member comdat group and the
9434 group hasn't be discarded, we check if it matches a linkonce
9435 section. We only record the discarded comdat group. Otherwise
9436 the undiscarded group will be discarded incorrectly later since
9437 itself has been recorded. */
9438 if (! already_linked (elf_next_in_group (sec
), group
))
9442 /* There is no direct match. But for linkonce section, we should
9443 check if there is a match with comdat group member. We always
9444 record the linkonce section, discarded or not. */
9445 already_linked (sec
, group
);
9447 /* This is the first section with this name. Record it. */
9448 bfd_section_already_linked_table_insert (already_linked_list
, sec
);