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 /* Add symbols from an ELF archive file to the linker hash table. We
4198 don't use _bfd_generic_link_add_archive_symbols because of a
4199 problem which arises on UnixWare. The UnixWare libc.so is an
4200 archive which includes an entry libc.so.1 which defines a bunch of
4201 symbols. The libc.so archive also includes a number of other
4202 object files, which also define symbols, some of which are the same
4203 as those defined in libc.so.1. Correct linking requires that we
4204 consider each object file in turn, and include it if it defines any
4205 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4206 this; it looks through the list of undefined symbols, and includes
4207 any object file which defines them. When this algorithm is used on
4208 UnixWare, it winds up pulling in libc.so.1 early and defining a
4209 bunch of symbols. This means that some of the other objects in the
4210 archive are not included in the link, which is incorrect since they
4211 precede libc.so.1 in the archive.
4213 Fortunately, ELF archive handling is simpler than that done by
4214 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4215 oddities. In ELF, if we find a symbol in the archive map, and the
4216 symbol is currently undefined, we know that we must pull in that
4219 Unfortunately, we do have to make multiple passes over the symbol
4220 table until nothing further is resolved. */
4223 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4226 bfd_boolean *defined = NULL;
4227 bfd_boolean *included = NULL;
4232 if (! bfd_has_map (abfd))
4234 /* An empty archive is a special case. */
4235 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4237 bfd_set_error (bfd_error_no_armap);
4241 /* Keep track of all symbols we know to be already defined, and all
4242 files we know to be already included. This is to speed up the
4243 second and subsequent passes. */
4244 c = bfd_ardata (abfd)->symdef_count;
4248 amt *= sizeof (bfd_boolean);
4249 defined = bfd_zmalloc (amt);
4250 included = bfd_zmalloc (amt);
4251 if (defined == NULL || included == NULL)
4254 symdefs = bfd_ardata (abfd)->symdefs;
4267 symdefend = symdef + c;
4268 for (i = 0; symdef < symdefend; symdef++, i++)
4270 struct elf_link_hash_entry *h;
4272 struct bfd_link_hash_entry *undefs_tail;
4275 if (defined[i] || included[i])
4277 if (symdef->file_offset == last)
4283 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
4284 FALSE, FALSE, FALSE);
4291 /* If this is a default version (the name contains @@),
4292 look up the symbol again with only one `@' as well
4293 as without the version. The effect is that references
4294 to the symbol with and without the version will be
4295 matched by the default symbol in the archive. */
4297 p = strchr (symdef->name, ELF_VER_CHR);
4298 if (p == NULL || p[1] != ELF_VER_CHR)
4301 /* First check with only one `@'. */
4302 len = strlen (symdef->name);
4303 copy = bfd_alloc (abfd, len);
4306 first = p - symdef->name + 1;
4307 memcpy (copy, symdef->name, first);
4308 memcpy (copy + first, symdef->name + first + 1, len - first);
4310 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4311 FALSE, FALSE, FALSE);
4315 /* We also need to check references to the symbol
4316 without the version. */
4318 copy[first - 1] = '\0';
4319 h = elf_link_hash_lookup (elf_hash_table (info),
4320 copy, FALSE, FALSE, FALSE);
4323 bfd_release (abfd, copy);
4329 if (h->root.type == bfd_link_hash_common)
4331 /* We currently have a common symbol. The archive map contains
4332 a reference to this symbol, so we may want to include it. We
4333 only want to include it however, if this archive element
4334 contains a definition of the symbol, not just another common
4337 Unfortunately some archivers (including GNU ar) will put
4338 declarations of common symbols into their archive maps, as
4339 well as real definitions, so we cannot just go by the archive
4340 map alone. Instead we must read in the element's symbol
4341 table and check that to see what kind of symbol definition
4343 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
4346 else if (h->root.type != bfd_link_hash_undefined)
4348 if (h->root.type != bfd_link_hash_undefweak)
4353 /* We need to include this archive member. */
4354 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
4355 if (element == NULL)
4358 if (! bfd_check_format (element, bfd_object))
4361 /* Doublecheck that we have not included this object
4362 already--it should be impossible, but there may be
4363 something wrong with the archive. */
4364 if (element->archive_pass != 0)
4366 bfd_set_error (bfd_error_bad_value);
4369 element->archive_pass = 1;
4371 undefs_tail = info->hash->undefs_tail;
4373 if (! (*info->callbacks->add_archive_element) (info, element,
4376 if (! bfd_link_add_symbols (element, info))
4379 /* If there are any new undefined symbols, we need to make
4380 another pass through the archive in order to see whether
4381 they can be defined. FIXME: This isn't perfect, because
4382 common symbols wind up on undefs_tail and because an
4383 undefined symbol which is defined later on in this pass
4384 does not require another pass. This isn't a bug, but it
4385 does make the code less efficient than it could be. */
4386 if (undefs_tail != info->hash->undefs_tail)
4389 /* Look backward to mark all symbols from this object file
4390 which we have already seen in this pass. */
4394 included[mark] = TRUE;
4399 while (symdefs[mark].file_offset == symdef->file_offset);
4401 /* We mark subsequent symbols from this object file as we go
4402 on through the loop. */
4403 last = symdef->file_offset;
4414 if (defined != NULL)
4416 if (included != NULL)
4421 /* Given an ELF BFD, add symbols to the global hash table as
4425 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
4427 switch (bfd_get_format (abfd))
4430 return elf_link_add_object_symbols (abfd, info);
4432 return elf_link_add_archive_symbols (abfd, info);
4434 bfd_set_error (bfd_error_wrong_format);
4439 /* This function will be called though elf_link_hash_traverse to store
4440 all hash value of the exported symbols in an array. */
4443 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
4445 unsigned long **valuep = data;
4451 if (h->root.type == bfd_link_hash_warning)
4452 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4454 /* Ignore indirect symbols. These are added by the versioning code. */
4455 if (h->dynindx == -1)
4458 name = h->root.root.string;
4459 p = strchr (name, ELF_VER_CHR);
4462 alc = bfd_malloc (p - name + 1);
4463 memcpy (alc, name, p - name);
4464 alc[p - name] = '\0';
4468 /* Compute the hash value. */
4469 ha = bfd_elf_hash (name);
4471 /* Store the found hash value in the array given as the argument. */
4474 /* And store it in the struct so that we can put it in the hash table
4476 h->elf_hash_value = ha;
4484 /* Array used to determine the number of hash table buckets to use
4485 based on the number of symbols there are. If there are fewer than
4486 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
4487 fewer than 37 we use 17 buckets, and so forth. We never use more
4488 than 32771 buckets. */
4490 static const size_t elf_buckets[] =
4492 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
4496 /* Compute bucket count for hashing table. We do not use a static set
4497 of possible tables sizes anymore. Instead we determine for all
4498 possible reasonable sizes of the table the outcome (i.e., the
4499 number of collisions etc) and choose the best solution. The
4500 weighting functions are not too simple to allow the table to grow
4501 without bounds. Instead one of the weighting factors is the size.
4502 Therefore the result is always a good payoff between few collisions
4503 (= short chain lengths) and table size. */
4505 compute_bucket_count (struct bfd_link_info *info)
4507 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
4508 size_t best_size = 0;
4509 unsigned long int *hashcodes;
4510 unsigned long int *hashcodesp;
4511 unsigned long int i;
4514 /* Compute the hash values for all exported symbols. At the same
4515 time store the values in an array so that we could use them for
4518 amt *= sizeof (unsigned long int);
4519 hashcodes = bfd_malloc (amt);
4520 if (hashcodes == NULL)
4522 hashcodesp = hashcodes;
4524 /* Put all hash values in HASHCODES. */
4525 elf_link_hash_traverse (elf_hash_table (info),
4526 elf_collect_hash_codes, &hashcodesp);
4528 /* We have a problem here. The following code to optimize the table
4529 size requires an integer type with more the 32 bits. If
4530 BFD_HOST_U_64_BIT is set we know about such a type. */
4531 #ifdef BFD_HOST_U_64_BIT
4534 unsigned long int nsyms = hashcodesp - hashcodes;
4537 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
4538 unsigned long int *counts ;
4539 bfd *dynobj = elf_hash_table (info)->dynobj;
4540 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
4542 /* Possible optimization parameters: if we have NSYMS symbols we say
4543 that the hashing table must at least have NSYMS/4 and at most
4545 minsize = nsyms / 4;
4548 best_size = maxsize = nsyms * 2;
4550 /* Create array where we count the collisions in. We must use bfd_malloc
4551 since the size could be large. */
4553 amt *= sizeof (unsigned long int);
4554 counts = bfd_malloc (amt);
4561 /* Compute the "optimal" size for the hash table. The criteria is a
4562 minimal chain length. The minor criteria is (of course) the size
4564 for (i = minsize; i < maxsize; ++i)
4566 /* Walk through the array of hashcodes and count the collisions. */
4567 BFD_HOST_U_64_BIT max;
4568 unsigned long int j;
4569 unsigned long int fact;
4571 memset (counts, '\0', i * sizeof (unsigned long int));
4573 /* Determine how often each hash bucket is used. */
4574 for (j = 0; j < nsyms; ++j)
4575 ++counts[hashcodes[j] % i];
4577 /* For the weight function we need some information about the
4578 pagesize on the target. This is information need not be 100%
4579 accurate. Since this information is not available (so far) we
4580 define it here to a reasonable default value. If it is crucial
4581 to have a better value some day simply define this value. */
4582 # ifndef BFD_TARGET_PAGESIZE
4583 # define BFD_TARGET_PAGESIZE (4096)
4586 /* We in any case need 2 + NSYMS entries for the size values and
4588 max = (2 + nsyms) * (bed->s->arch_size / 8);
4591 /* Variant 1: optimize for short chains. We add the squares
4592 of all the chain lengths (which favors many small chain
4593 over a few long chains). */
4594 for (j = 0; j < i; ++j)
4595 max += counts[j] * counts[j];
4597 /* This adds penalties for the overall size of the table. */
4598 fact = i / (BFD_TARGET_PAGESIZE / (bed->s->arch_size / 8)) + 1;
4601 /* Variant 2: Optimize a lot more for small table. Here we
4602 also add squares of the size but we also add penalties for
4603 empty slots (the +1 term). */
4604 for (j = 0; j < i; ++j)
4605 max += (1 + counts[j]) * (1 + counts[j]);
4607 /* The overall size of the table is considered, but not as
4608 strong as in variant 1, where it is squared. */
4609 fact = i / (BFD_TARGET_PAGESIZE / (bed->s->arch_size / 8)) + 1;
4613 /* Compare with current best results. */
4614 if (max < best_chlen)
4624 #endif /* defined (BFD_HOST_U_64_BIT) */
4626 /* This is the fallback solution if no 64bit type is available or if we
4627 are not supposed to spend much time on optimizations. We select the
4628 bucket count using a fixed set of numbers. */
4629 for (i = 0; elf_buckets[i] != 0; i++)
4631 best_size = elf_buckets[i];
4632 if (dynsymcount < elf_buckets[i + 1])
4637 /* Free the arrays we needed. */
4643 /* Set up the sizes and contents of the ELF dynamic sections. This is
4644 called by the ELF linker emulation before_allocation routine. We
4645 must set the sizes of the sections before the linker sets the
4646 addresses of the various sections. */
4649 bfd_elf_size_dynamic_sections (bfd *output_bfd,
4652 const char *filter_shlib,
4653 const char * const *auxiliary_filters,
4654 struct bfd_link_info *info,
4655 asection **sinterpptr,
4656 struct bfd_elf_version_tree *verdefs)
4658 bfd_size_type soname_indx;
4660 const struct elf_backend_data *bed;
4661 struct elf_assign_sym_version_info asvinfo;
4665 soname_indx = (bfd_size_type) -1;
4667 if (!is_elf_hash_table (info->hash))
4670 elf_tdata (output_bfd)->relro = info->relro;
4671 if (info->execstack)
4672 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
4673 else if (info->noexecstack)
4674 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
4678 asection *notesec = NULL;
4681 for (inputobj = info->input_bfds;
4683 inputobj = inputobj->link_next)
4687 if (inputobj->flags & DYNAMIC)
4689 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
4692 if (s->flags & SEC_CODE)
4701 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
4702 if (exec && info->relocatable
4703 && notesec->output_section != bfd_abs_section_ptr)
4704 notesec->output_section->flags |= SEC_CODE;
4708 /* Any syms created from now on start with -1 in
4709 got.refcount/offset and plt.refcount/offset. */
4710 elf_hash_table (info)->init_refcount = elf_hash_table (info)->init_offset;
4712 /* The backend may have to create some sections regardless of whether
4713 we're dynamic or not. */
4714 bed = get_elf_backend_data (output_bfd);
4715 if (bed->elf_backend_always_size_sections
4716 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
4719 dynobj = elf_hash_table (info)->dynobj;
4721 /* If there were no dynamic objects in the link, there is nothing to
4726 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
4729 if (elf_hash_table (info)->dynamic_sections_created)
4731 struct elf_info_failed eif;
4732 struct elf_link_hash_entry *h;
4734 struct bfd_elf_version_tree *t;
4735 struct bfd_elf_version_expr *d;
4736 bfd_boolean all_defined;
4738 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
4739 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
4743 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
4745 if (soname_indx == (bfd_size_type) -1
4746 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
4752 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
4754 info->flags |= DF_SYMBOLIC;
4761 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
4763 if (indx == (bfd_size_type) -1
4764 || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
4767 if (info->new_dtags)
4769 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
4770 if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))
4775 if (filter_shlib != NULL)
4779 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
4780 filter_shlib, TRUE);
4781 if (indx == (bfd_size_type) -1
4782 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
4786 if (auxiliary_filters != NULL)
4788 const char * const *p;
4790 for (p = auxiliary_filters; *p != NULL; p++)
4794 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
4796 if (indx == (bfd_size_type) -1
4797 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
4803 eif.verdefs = verdefs;
4806 /* If we are supposed to export all symbols into the dynamic symbol
4807 table (this is not the normal case), then do so. */
4808 if (info->export_dynamic)
4810 elf_link_hash_traverse (elf_hash_table (info),
4811 _bfd_elf_export_symbol,
4817 /* Make all global versions with definition. */
4818 for (t = verdefs; t != NULL; t = t->next)
4819 for (d = t->globals.list; d != NULL; d = d->next)
4820 if (!d->symver && d->symbol)
4822 const char *verstr, *name;
4823 size_t namelen, verlen, newlen;
4825 struct elf_link_hash_entry *newh;
4828 namelen = strlen (name);
4830 verlen = strlen (verstr);
4831 newlen = namelen + verlen + 3;
4833 newname = bfd_malloc (newlen);
4834 if (newname == NULL)
4836 memcpy (newname, name, namelen);
4838 /* Check the hidden versioned definition. */
4839 p = newname + namelen;
4841 memcpy (p, verstr, verlen + 1);
4842 newh = elf_link_hash_lookup (elf_hash_table (info),
4843 newname, FALSE, FALSE,
4846 || (newh->root.type != bfd_link_hash_defined
4847 && newh->root.type != bfd_link_hash_defweak))
4849 /* Check the default versioned definition. */
4851 memcpy (p, verstr, verlen + 1);
4852 newh = elf_link_hash_lookup (elf_hash_table (info),
4853 newname, FALSE, FALSE,
4858 /* Mark this version if there is a definition and it is
4859 not defined in a shared object. */
4861 && ((newh->elf_link_hash_flags
4862 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)
4863 && (newh->root.type == bfd_link_hash_defined
4864 || newh->root.type == bfd_link_hash_defweak))
4868 /* Attach all the symbols to their version information. */
4869 asvinfo.output_bfd = output_bfd;
4870 asvinfo.info = info;
4871 asvinfo.verdefs = verdefs;
4872 asvinfo.failed = FALSE;
4874 elf_link_hash_traverse (elf_hash_table (info),
4875 _bfd_elf_link_assign_sym_version,
4880 if (!info->allow_undefined_version)
4882 /* Check if all global versions have a definition. */
4884 for (t = verdefs; t != NULL; t = t->next)
4885 for (d = t->globals.list; d != NULL; d = d->next)
4886 if (!d->symver && !d->script)
4888 (*_bfd_error_handler)
4889 (_("%s: undefined version: %s"),
4890 d->pattern, t->name);
4891 all_defined = FALSE;
4896 bfd_set_error (bfd_error_bad_value);
4901 /* Find all symbols which were defined in a dynamic object and make
4902 the backend pick a reasonable value for them. */
4903 elf_link_hash_traverse (elf_hash_table (info),
4904 _bfd_elf_adjust_dynamic_symbol,
4909 /* Add some entries to the .dynamic section. We fill in some of the
4910 values later, in elf_bfd_final_link, but we must add the entries
4911 now so that we know the final size of the .dynamic section. */
4913 /* If there are initialization and/or finalization functions to
4914 call then add the corresponding DT_INIT/DT_FINI entries. */
4915 h = (info->init_function
4916 ? elf_link_hash_lookup (elf_hash_table (info),
4917 info->init_function, FALSE,
4921 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
4922 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
4924 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
4927 h = (info->fini_function
4928 ? elf_link_hash_lookup (elf_hash_table (info),
4929 info->fini_function, FALSE,
4933 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
4934 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
4936 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
4940 if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL)
4942 /* DT_PREINIT_ARRAY is not allowed in shared library. */
4943 if (! info->executable)
4948 for (sub = info->input_bfds; sub != NULL;
4949 sub = sub->link_next)
4950 for (o = sub->sections; o != NULL; o = o->next)
4951 if (elf_section_data (o)->this_hdr.sh_type
4952 == SHT_PREINIT_ARRAY)
4954 (*_bfd_error_handler)
4955 (_("%s: .preinit_array section is not allowed in DSO"),
4956 bfd_archive_filename (sub));
4960 bfd_set_error (bfd_error_nonrepresentable_section);
4964 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
4965 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
4968 if (bfd_get_section_by_name (output_bfd, ".init_array") != NULL)
4970 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
4971 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
4974 if (bfd_get_section_by_name (output_bfd, ".fini_array") != NULL)
4976 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
4977 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
4981 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
4982 /* If .dynstr is excluded from the link, we don't want any of
4983 these tags. Strictly, we should be checking each section
4984 individually; This quick check covers for the case where
4985 someone does a /DISCARD/ : { *(*) }. */
4986 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
4988 bfd_size_type strsize;
4990 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
4991 if (!_bfd_elf_add_dynamic_entry (info, DT_HASH, 0)
4992 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
4993 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
4994 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
4995 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
4996 bed->s->sizeof_sym))
5001 /* The backend must work out the sizes of all the other dynamic
5003 if (bed->elf_backend_size_dynamic_sections
5004 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5007 if (elf_hash_table (info)->dynamic_sections_created)
5009 bfd_size_type dynsymcount;
5011 size_t bucketcount = 0;
5012 size_t hash_entry_size;
5013 unsigned int dtagcount;
5015 /* Set up the version definition section. */
5016 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
5017 BFD_ASSERT (s != NULL);
5019 /* We may have created additional version definitions if we are
5020 just linking a regular application. */
5021 verdefs = asvinfo.verdefs;
5023 /* Skip anonymous version tag. */
5024 if (verdefs != NULL && verdefs->vernum == 0)
5025 verdefs = verdefs->next;
5027 if (verdefs == NULL)
5028 _bfd_strip_section_from_output (info, s);
5033 struct bfd_elf_version_tree *t;
5035 Elf_Internal_Verdef def;
5036 Elf_Internal_Verdaux defaux;
5041 /* Make space for the base version. */
5042 size += sizeof (Elf_External_Verdef);
5043 size += sizeof (Elf_External_Verdaux);
5046 for (t = verdefs; t != NULL; t = t->next)
5048 struct bfd_elf_version_deps *n;
5050 size += sizeof (Elf_External_Verdef);
5051 size += sizeof (Elf_External_Verdaux);
5054 for (n = t->deps; n != NULL; n = n->next)
5055 size += sizeof (Elf_External_Verdaux);
5059 s->contents = bfd_alloc (output_bfd, s->size);
5060 if (s->contents == NULL && s->size != 0)
5063 /* Fill in the version definition section. */
5067 def.vd_version = VER_DEF_CURRENT;
5068 def.vd_flags = VER_FLG_BASE;
5071 def.vd_aux = sizeof (Elf_External_Verdef);
5072 def.vd_next = (sizeof (Elf_External_Verdef)
5073 + sizeof (Elf_External_Verdaux));
5075 if (soname_indx != (bfd_size_type) -1)
5077 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5079 def.vd_hash = bfd_elf_hash (soname);
5080 defaux.vda_name = soname_indx;
5087 name = basename (output_bfd->filename);
5088 def.vd_hash = bfd_elf_hash (name);
5089 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5091 if (indx == (bfd_size_type) -1)
5093 defaux.vda_name = indx;
5095 defaux.vda_next = 0;
5097 _bfd_elf_swap_verdef_out (output_bfd, &def,
5098 (Elf_External_Verdef *) p);
5099 p += sizeof (Elf_External_Verdef);
5100 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5101 (Elf_External_Verdaux *) p);
5102 p += sizeof (Elf_External_Verdaux);
5104 for (t = verdefs; t != NULL; t = t->next)
5107 struct bfd_elf_version_deps *n;
5108 struct elf_link_hash_entry *h;
5109 struct bfd_link_hash_entry *bh;
5112 for (n = t->deps; n != NULL; n = n->next)
5115 /* Add a symbol representing this version. */
5117 if (! (_bfd_generic_link_add_one_symbol
5118 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
5120 get_elf_backend_data (dynobj)->collect, &bh)))
5122 h = (struct elf_link_hash_entry *) bh;
5123 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
5124 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
5125 h->type = STT_OBJECT;
5126 h->verinfo.vertree = t;
5128 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5131 def.vd_version = VER_DEF_CURRENT;
5133 if (t->globals.list == NULL
5134 && t->locals.list == NULL
5136 def.vd_flags |= VER_FLG_WEAK;
5137 def.vd_ndx = t->vernum + 1;
5138 def.vd_cnt = cdeps + 1;
5139 def.vd_hash = bfd_elf_hash (t->name);
5140 def.vd_aux = sizeof (Elf_External_Verdef);
5142 if (t->next != NULL)
5143 def.vd_next = (sizeof (Elf_External_Verdef)
5144 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
5146 _bfd_elf_swap_verdef_out (output_bfd, &def,
5147 (Elf_External_Verdef *) p);
5148 p += sizeof (Elf_External_Verdef);
5150 defaux.vda_name = h->dynstr_index;
5151 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5153 defaux.vda_next = 0;
5154 if (t->deps != NULL)
5155 defaux.vda_next = sizeof (Elf_External_Verdaux);
5156 t->name_indx = defaux.vda_name;
5158 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5159 (Elf_External_Verdaux *) p);
5160 p += sizeof (Elf_External_Verdaux);
5162 for (n = t->deps; n != NULL; n = n->next)
5164 if (n->version_needed == NULL)
5166 /* This can happen if there was an error in the
5168 defaux.vda_name = 0;
5172 defaux.vda_name = n->version_needed->name_indx;
5173 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5176 if (n->next == NULL)
5177 defaux.vda_next = 0;
5179 defaux.vda_next = sizeof (Elf_External_Verdaux);
5181 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5182 (Elf_External_Verdaux *) p);
5183 p += sizeof (Elf_External_Verdaux);
5187 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
5188 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
5191 elf_tdata (output_bfd)->cverdefs = cdefs;
5194 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
5196 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
5199 else if (info->flags & DF_BIND_NOW)
5201 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
5207 if (info->executable)
5208 info->flags_1 &= ~ (DF_1_INITFIRST
5211 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
5215 /* Work out the size of the version reference section. */
5217 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
5218 BFD_ASSERT (s != NULL);
5220 struct elf_find_verdep_info sinfo;
5222 sinfo.output_bfd = output_bfd;
5224 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
5225 if (sinfo.vers == 0)
5227 sinfo.failed = FALSE;
5229 elf_link_hash_traverse (elf_hash_table (info),
5230 _bfd_elf_link_find_version_dependencies,
5233 if (elf_tdata (output_bfd)->verref == NULL)
5234 _bfd_strip_section_from_output (info, s);
5237 Elf_Internal_Verneed *t;
5242 /* Build the version definition section. */
5245 for (t = elf_tdata (output_bfd)->verref;
5249 Elf_Internal_Vernaux *a;
5251 size += sizeof (Elf_External_Verneed);
5253 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
5254 size += sizeof (Elf_External_Vernaux);
5258 s->contents = bfd_alloc (output_bfd, s->size);
5259 if (s->contents == NULL)
5263 for (t = elf_tdata (output_bfd)->verref;
5268 Elf_Internal_Vernaux *a;
5272 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
5275 t->vn_version = VER_NEED_CURRENT;
5277 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5278 elf_dt_name (t->vn_bfd) != NULL
5279 ? elf_dt_name (t->vn_bfd)
5280 : basename (t->vn_bfd->filename),
5282 if (indx == (bfd_size_type) -1)
5285 t->vn_aux = sizeof (Elf_External_Verneed);
5286 if (t->vn_nextref == NULL)
5289 t->vn_next = (sizeof (Elf_External_Verneed)
5290 + caux * sizeof (Elf_External_Vernaux));
5292 _bfd_elf_swap_verneed_out (output_bfd, t,
5293 (Elf_External_Verneed *) p);
5294 p += sizeof (Elf_External_Verneed);
5296 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
5298 a->vna_hash = bfd_elf_hash (a->vna_nodename);
5299 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5300 a->vna_nodename, FALSE);
5301 if (indx == (bfd_size_type) -1)
5304 if (a->vna_nextptr == NULL)
5307 a->vna_next = sizeof (Elf_External_Vernaux);
5309 _bfd_elf_swap_vernaux_out (output_bfd, a,
5310 (Elf_External_Vernaux *) p);
5311 p += sizeof (Elf_External_Vernaux);
5315 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
5316 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
5319 elf_tdata (output_bfd)->cverrefs = crefs;
5323 /* Assign dynsym indicies. In a shared library we generate a
5324 section symbol for each output section, which come first.
5325 Next come all of the back-end allocated local dynamic syms,
5326 followed by the rest of the global symbols. */
5328 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
5330 /* Work out the size of the symbol version section. */
5331 s = bfd_get_section_by_name (dynobj, ".gnu.version");
5332 BFD_ASSERT (s != NULL);
5333 if (dynsymcount == 0
5334 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
5336 _bfd_strip_section_from_output (info, s);
5337 /* The DYNSYMCOUNT might have changed if we were going to
5338 output a dynamic symbol table entry for S. */
5339 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
5343 s->size = dynsymcount * sizeof (Elf_External_Versym);
5344 s->contents = bfd_zalloc (output_bfd, s->size);
5345 if (s->contents == NULL)
5348 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
5352 /* Set the size of the .dynsym and .hash sections. We counted
5353 the number of dynamic symbols in elf_link_add_object_symbols.
5354 We will build the contents of .dynsym and .hash when we build
5355 the final symbol table, because until then we do not know the
5356 correct value to give the symbols. We built the .dynstr
5357 section as we went along in elf_link_add_object_symbols. */
5358 s = bfd_get_section_by_name (dynobj, ".dynsym");
5359 BFD_ASSERT (s != NULL);
5360 s->size = dynsymcount * bed->s->sizeof_sym;
5361 s->contents = bfd_alloc (output_bfd, s->size);
5362 if (s->contents == NULL && s->size != 0)
5365 if (dynsymcount != 0)
5367 Elf_Internal_Sym isym;
5369 /* The first entry in .dynsym is a dummy symbol. */
5376 bed->s->swap_symbol_out (output_bfd, &isym, s->contents, 0);
5379 /* Compute the size of the hashing table. As a side effect this
5380 computes the hash values for all the names we export. */
5381 bucketcount = compute_bucket_count (info);
5383 s = bfd_get_section_by_name (dynobj, ".hash");
5384 BFD_ASSERT (s != NULL);
5385 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
5386 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
5387 s->contents = bfd_zalloc (output_bfd, s->size);
5388 if (s->contents == NULL)
5391 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
5392 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
5393 s->contents + hash_entry_size);
5395 elf_hash_table (info)->bucketcount = bucketcount;
5397 s = bfd_get_section_by_name (dynobj, ".dynstr");
5398 BFD_ASSERT (s != NULL);
5400 elf_finalize_dynstr (output_bfd, info);
5402 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5404 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
5405 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
5412 /* Final phase of ELF linker. */
5414 /* A structure we use to avoid passing large numbers of arguments. */
5416 struct elf_final_link_info
5418 /* General link information. */
5419 struct bfd_link_info *info;
5422 /* Symbol string table. */
5423 struct bfd_strtab_hash *symstrtab;
5424 /* .dynsym section. */
5425 asection *dynsym_sec;
5426 /* .hash section. */
5428 /* symbol version section (.gnu.version). */
5429 asection *symver_sec;
5430 /* Buffer large enough to hold contents of any section. */
5432 /* Buffer large enough to hold external relocs of any section. */
5433 void *external_relocs;
5434 /* Buffer large enough to hold internal relocs of any section. */
5435 Elf_Internal_Rela *internal_relocs;
5436 /* Buffer large enough to hold external local symbols of any input
5438 bfd_byte *external_syms;
5439 /* And a buffer for symbol section indices. */
5440 Elf_External_Sym_Shndx *locsym_shndx;
5441 /* Buffer large enough to hold internal local symbols of any input
5443 Elf_Internal_Sym *internal_syms;
5444 /* Array large enough to hold a symbol index for each local symbol
5445 of any input BFD. */
5447 /* Array large enough to hold a section pointer for each local
5448 symbol of any input BFD. */
5449 asection **sections;
5450 /* Buffer to hold swapped out symbols. */
5452 /* And one for symbol section indices. */
5453 Elf_External_Sym_Shndx *symshndxbuf;
5454 /* Number of swapped out symbols in buffer. */
5455 size_t symbuf_count;
5456 /* Number of symbols which fit in symbuf. */
5458 /* And same for symshndxbuf. */
5459 size_t shndxbuf_size;
5462 /* This struct is used to pass information to elf_link_output_extsym. */
5464 struct elf_outext_info
5467 bfd_boolean localsyms;
5468 struct elf_final_link_info *finfo;
5471 /* When performing a relocatable link, the input relocations are
5472 preserved. But, if they reference global symbols, the indices
5473 referenced must be updated. Update all the relocations in
5474 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
5477 elf_link_adjust_relocs (bfd *abfd,
5478 Elf_Internal_Shdr *rel_hdr,
5480 struct elf_link_hash_entry **rel_hash)
5483 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5485 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
5486 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
5487 bfd_vma r_type_mask;
5490 if (rel_hdr->sh_entsize == bed->s->sizeof_rel)
5492 swap_in = bed->s->swap_reloc_in;
5493 swap_out = bed->s->swap_reloc_out;
5495 else if (rel_hdr->sh_entsize == bed->s->sizeof_rela)
5497 swap_in = bed->s->swap_reloca_in;
5498 swap_out = bed->s->swap_reloca_out;
5503 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
5506 if (bed->s->arch_size == 32)
5513 r_type_mask = 0xffffffff;
5517 erela = rel_hdr->contents;
5518 for (i = 0; i < count; i++, rel_hash++, erela += rel_hdr->sh_entsize)
5520 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
5523 if (*rel_hash == NULL)
5526 BFD_ASSERT ((*rel_hash)->indx >= 0);
5528 (*swap_in) (abfd, erela, irela);
5529 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
5530 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
5531 | (irela[j].r_info & r_type_mask));
5532 (*swap_out) (abfd, irela, erela);
5536 struct elf_link_sort_rela
5542 enum elf_reloc_type_class type;
5543 /* We use this as an array of size int_rels_per_ext_rel. */
5544 Elf_Internal_Rela rela[1];
5548 elf_link_sort_cmp1 (const void *A, const void *B)
5550 const struct elf_link_sort_rela *a = A;
5551 const struct elf_link_sort_rela *b = B;
5552 int relativea, relativeb;
5554 relativea = a->type == reloc_class_relative;
5555 relativeb = b->type == reloc_class_relative;
5557 if (relativea < relativeb)
5559 if (relativea > relativeb)
5561 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
5563 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
5565 if (a->rela->r_offset < b->rela->r_offset)
5567 if (a->rela->r_offset > b->rela->r_offset)
5573 elf_link_sort_cmp2 (const void *A, const void *B)
5575 const struct elf_link_sort_rela *a = A;
5576 const struct elf_link_sort_rela *b = B;
5579 if (a->u.offset < b->u.offset)
5581 if (a->u.offset > b->u.offset)
5583 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
5584 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
5589 if (a->rela->r_offset < b->rela->r_offset)
5591 if (a->rela->r_offset > b->rela->r_offset)
5597 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
5600 bfd_size_type count, size;
5601 size_t i, ret, sort_elt, ext_size;
5602 bfd_byte *sort, *s_non_relative, *p;
5603 struct elf_link_sort_rela *sq;
5604 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5605 int i2e = bed->s->int_rels_per_ext_rel;
5606 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
5607 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
5608 struct bfd_link_order *lo;
5611 reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
5612 if (reldyn == NULL || reldyn->size == 0)
5614 reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
5615 if (reldyn == NULL || reldyn->size == 0)
5617 ext_size = bed->s->sizeof_rel;
5618 swap_in = bed->s->swap_reloc_in;
5619 swap_out = bed->s->swap_reloc_out;
5623 ext_size = bed->s->sizeof_rela;
5624 swap_in = bed->s->swap_reloca_in;
5625 swap_out = bed->s->swap_reloca_out;
5627 count = reldyn->size / ext_size;
5630 for (lo = reldyn->link_order_head; lo != NULL; lo = lo->next)
5631 if (lo->type == bfd_indirect_link_order)
5633 asection *o = lo->u.indirect.section;
5637 if (size != reldyn->size)
5640 sort_elt = (sizeof (struct elf_link_sort_rela)
5641 + (i2e - 1) * sizeof (Elf_Internal_Rela));
5642 sort = bfd_zmalloc (sort_elt * count);
5645 (*info->callbacks->warning)
5646 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
5650 if (bed->s->arch_size == 32)
5651 r_sym_mask = ~(bfd_vma) 0xff;
5653 r_sym_mask = ~(bfd_vma) 0xffffffff;
5655 for (lo = reldyn->link_order_head; lo != NULL; lo = lo->next)
5656 if (lo->type == bfd_indirect_link_order)
5658 bfd_byte *erel, *erelend;
5659 asection *o = lo->u.indirect.section;
5662 erelend = o->contents + o->size;
5663 p = sort + o->output_offset / ext_size * sort_elt;
5664 while (erel < erelend)
5666 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
5667 (*swap_in) (abfd, erel, s->rela);
5668 s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
5669 s->u.sym_mask = r_sym_mask;
5675 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
5677 for (i = 0, p = sort; i < count; i++, p += sort_elt)
5679 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
5680 if (s->type != reloc_class_relative)
5686 sq = (struct elf_link_sort_rela *) s_non_relative;
5687 for (; i < count; i++, p += sort_elt)
5689 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
5690 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
5692 sp->u.offset = sq->rela->r_offset;
5695 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
5697 for (lo = reldyn->link_order_head; lo != NULL; lo = lo->next)
5698 if (lo->type == bfd_indirect_link_order)
5700 bfd_byte *erel, *erelend;
5701 asection *o = lo->u.indirect.section;
5704 erelend = o->contents + o->size;
5705 p = sort + o->output_offset / ext_size * sort_elt;
5706 while (erel < erelend)
5708 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
5709 (*swap_out) (abfd, s->rela, erel);
5720 /* Flush the output symbols to the file. */
5723 elf_link_flush_output_syms (struct elf_final_link_info *finfo,
5724 const struct elf_backend_data *bed)
5726 if (finfo->symbuf_count > 0)
5728 Elf_Internal_Shdr *hdr;
5732 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5733 pos = hdr->sh_offset + hdr->sh_size;
5734 amt = finfo->symbuf_count * bed->s->sizeof_sym;
5735 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5736 || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
5739 hdr->sh_size += amt;
5740 finfo->symbuf_count = 0;
5746 /* Add a symbol to the output symbol table. */
5749 elf_link_output_sym (struct elf_final_link_info *finfo,
5751 Elf_Internal_Sym *elfsym,
5752 asection *input_sec,
5753 struct elf_link_hash_entry *h)
5756 Elf_External_Sym_Shndx *destshndx;
5757 bfd_boolean (*output_symbol_hook)
5758 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
5759 struct elf_link_hash_entry *);
5760 const struct elf_backend_data *bed;
5762 bed = get_elf_backend_data (finfo->output_bfd);
5763 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
5764 if (output_symbol_hook != NULL)
5766 if (! (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h))
5770 if (name == NULL || *name == '\0')
5771 elfsym->st_name = 0;
5772 else if (input_sec->flags & SEC_EXCLUDE)
5773 elfsym->st_name = 0;
5776 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5778 if (elfsym->st_name == (unsigned long) -1)
5782 if (finfo->symbuf_count >= finfo->symbuf_size)
5784 if (! elf_link_flush_output_syms (finfo, bed))
5788 dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym;
5789 destshndx = finfo->symshndxbuf;
5790 if (destshndx != NULL)
5792 if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
5796 amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
5797 finfo->symshndxbuf = destshndx = bfd_realloc (destshndx, amt * 2);
5798 if (destshndx == NULL)
5800 memset ((char *) destshndx + amt, 0, amt);
5801 finfo->shndxbuf_size *= 2;
5803 destshndx += bfd_get_symcount (finfo->output_bfd);
5806 bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
5807 finfo->symbuf_count += 1;
5808 bfd_get_symcount (finfo->output_bfd) += 1;
5813 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
5814 allowing an unsatisfied unversioned symbol in the DSO to match a
5815 versioned symbol that would normally require an explicit version.
5816 We also handle the case that a DSO references a hidden symbol
5817 which may be satisfied by a versioned symbol in another DSO. */
5820 elf_link_check_versioned_symbol (struct bfd_link_info *info,
5821 const struct elf_backend_data *bed,
5822 struct elf_link_hash_entry *h)
5825 struct elf_link_loaded_list *loaded;
5827 if (!is_elf_hash_table (info->hash))
5830 switch (h->root.type)
5836 case bfd_link_hash_undefined:
5837 case bfd_link_hash_undefweak:
5838 abfd = h->root.u.undef.abfd;
5839 if ((abfd->flags & DYNAMIC) == 0
5840 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
5844 case bfd_link_hash_defined:
5845 case bfd_link_hash_defweak:
5846 abfd = h->root.u.def.section->owner;
5849 case bfd_link_hash_common:
5850 abfd = h->root.u.c.p->section->owner;
5853 BFD_ASSERT (abfd != NULL);
5855 for (loaded = elf_hash_table (info)->loaded;
5857 loaded = loaded->next)
5860 Elf_Internal_Shdr *hdr;
5861 bfd_size_type symcount;
5862 bfd_size_type extsymcount;
5863 bfd_size_type extsymoff;
5864 Elf_Internal_Shdr *versymhdr;
5865 Elf_Internal_Sym *isym;
5866 Elf_Internal_Sym *isymend;
5867 Elf_Internal_Sym *isymbuf;
5868 Elf_External_Versym *ever;
5869 Elf_External_Versym *extversym;
5871 input = loaded->abfd;
5873 /* We check each DSO for a possible hidden versioned definition. */
5875 || (input->flags & DYNAMIC) == 0
5876 || elf_dynversym (input) == 0)
5879 hdr = &elf_tdata (input)->dynsymtab_hdr;
5881 symcount = hdr->sh_size / bed->s->sizeof_sym;
5882 if (elf_bad_symtab (input))
5884 extsymcount = symcount;
5889 extsymcount = symcount - hdr->sh_info;
5890 extsymoff = hdr->sh_info;
5893 if (extsymcount == 0)
5896 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
5898 if (isymbuf == NULL)
5901 /* Read in any version definitions. */
5902 versymhdr = &elf_tdata (input)->dynversym_hdr;
5903 extversym = bfd_malloc (versymhdr->sh_size);
5904 if (extversym == NULL)
5907 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
5908 || (bfd_bread (extversym, versymhdr->sh_size, input)
5909 != versymhdr->sh_size))
5917 ever = extversym + extsymoff;
5918 isymend = isymbuf + extsymcount;
5919 for (isym = isymbuf; isym < isymend; isym++, ever++)
5922 Elf_Internal_Versym iver;
5923 unsigned short version_index;
5925 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
5926 || isym->st_shndx == SHN_UNDEF)
5929 name = bfd_elf_string_from_elf_section (input,
5932 if (strcmp (name, h->root.root.string) != 0)
5935 _bfd_elf_swap_versym_in (input, ever, &iver);
5937 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
5939 /* If we have a non-hidden versioned sym, then it should
5940 have provided a definition for the undefined sym. */
5944 version_index = iver.vs_vers & VERSYM_VERSION;
5945 if (version_index == 1 || version_index == 2)
5947 /* This is the base or first version. We can use it. */
5961 /* Add an external symbol to the symbol table. This is called from
5962 the hash table traversal routine. When generating a shared object,
5963 we go through the symbol table twice. The first time we output
5964 anything that might have been forced to local scope in a version
5965 script. The second time we output the symbols that are still
5969 elf_link_output_extsym (struct elf_link_hash_entry *h, void *data)
5971 struct elf_outext_info *eoinfo = data;
5972 struct elf_final_link_info *finfo = eoinfo->finfo;
5974 Elf_Internal_Sym sym;
5975 asection *input_sec;
5976 const struct elf_backend_data *bed;
5978 if (h->root.type == bfd_link_hash_warning)
5980 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5981 if (h->root.type == bfd_link_hash_new)
5985 /* Decide whether to output this symbol in this pass. */
5986 if (eoinfo->localsyms)
5988 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5993 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5997 bed = get_elf_backend_data (finfo->output_bfd);
5999 /* If we have an undefined symbol reference here then it must have
6000 come from a shared library that is being linked in. (Undefined
6001 references in regular files have already been handled). If we
6002 are reporting errors for this situation then do so now. */
6003 if (h->root.type == bfd_link_hash_undefined
6004 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
6005 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
6006 && ! elf_link_check_versioned_symbol (finfo->info, bed, h)
6007 && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
6009 if (! ((*finfo->info->callbacks->undefined_symbol)
6010 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
6011 NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
6013 eoinfo->failed = TRUE;
6018 /* We should also warn if a forced local symbol is referenced from
6019 shared libraries. */
6020 if (! finfo->info->relocatable
6021 && (! finfo->info->shared)
6022 && (h->elf_link_hash_flags
6023 & (ELF_LINK_FORCED_LOCAL | ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_DYNAMIC_DEF | ELF_LINK_DYNAMIC_WEAK))
6024 == (ELF_LINK_FORCED_LOCAL | ELF_LINK_HASH_REF_DYNAMIC)
6025 && ! elf_link_check_versioned_symbol (finfo->info, bed, h))
6027 (*_bfd_error_handler)
6028 (_("%s: %s symbol `%s' in %s is referenced by DSO"),
6029 bfd_get_filename (finfo->output_bfd),
6030 ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
6032 : ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
6033 ? "hidden" : "local",
6034 h->root.root.string,
6035 bfd_archive_filename (h->root.u.def.section->owner));
6036 eoinfo->failed = TRUE;
6040 /* We don't want to output symbols that have never been mentioned by
6041 a regular file, or that we have been told to strip. However, if
6042 h->indx is set to -2, the symbol is used by a reloc and we must
6046 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
6047 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
6048 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
6049 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
6051 else if (finfo->info->strip == strip_all)
6053 else if (finfo->info->strip == strip_some
6054 && bfd_hash_lookup (finfo->info->keep_hash,
6055 h->root.root.string, FALSE, FALSE) == NULL)
6057 else if (finfo->info->strip_discarded
6058 && (h->root.type == bfd_link_hash_defined
6059 || h->root.type == bfd_link_hash_defweak)
6060 && elf_discarded_section (h->root.u.def.section))
6065 /* If we're stripping it, and it's not a dynamic symbol, there's
6066 nothing else to do unless it is a forced local symbol. */
6069 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6073 sym.st_size = h->size;
6074 sym.st_other = h->other;
6075 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6076 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
6077 else if (h->root.type == bfd_link_hash_undefweak
6078 || h->root.type == bfd_link_hash_defweak)
6079 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
6081 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
6083 switch (h->root.type)
6086 case bfd_link_hash_new:
6087 case bfd_link_hash_warning:
6091 case bfd_link_hash_undefined:
6092 case bfd_link_hash_undefweak:
6093 input_sec = bfd_und_section_ptr;
6094 sym.st_shndx = SHN_UNDEF;
6097 case bfd_link_hash_defined:
6098 case bfd_link_hash_defweak:
6100 input_sec = h->root.u.def.section;
6101 if (input_sec->output_section != NULL)
6104 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
6105 input_sec->output_section);
6106 if (sym.st_shndx == SHN_BAD)
6108 char *sec_name = bfd_get_section_ident (input_sec);
6109 (*_bfd_error_handler)
6110 (_("%s: could not find output section %s for input section %s"),
6111 bfd_get_filename (finfo->output_bfd),
6112 input_sec->output_section->name,
6113 sec_name ? sec_name : input_sec->name);
6116 eoinfo->failed = TRUE;
6120 /* ELF symbols in relocatable files are section relative,
6121 but in nonrelocatable files they are virtual
6123 sym.st_value = h->root.u.def.value + input_sec->output_offset;
6124 if (! finfo->info->relocatable)
6126 sym.st_value += input_sec->output_section->vma;
6127 if (h->type == STT_TLS)
6129 /* STT_TLS symbols are relative to PT_TLS segment
6131 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
6132 sym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
6138 BFD_ASSERT (input_sec->owner == NULL
6139 || (input_sec->owner->flags & DYNAMIC) != 0);
6140 sym.st_shndx = SHN_UNDEF;
6141 input_sec = bfd_und_section_ptr;
6146 case bfd_link_hash_common:
6147 input_sec = h->root.u.c.p->section;
6148 sym.st_shndx = SHN_COMMON;
6149 sym.st_value = 1 << h->root.u.c.p->alignment_power;
6152 case bfd_link_hash_indirect:
6153 /* These symbols are created by symbol versioning. They point
6154 to the decorated version of the name. For example, if the
6155 symbol foo@@GNU_1.2 is the default, which should be used when
6156 foo is used with no version, then we add an indirect symbol
6157 foo which points to foo@@GNU_1.2. We ignore these symbols,
6158 since the indirected symbol is already in the hash table. */
6162 /* Give the processor backend a chance to tweak the symbol value,
6163 and also to finish up anything that needs to be done for this
6164 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6165 forced local syms when non-shared is due to a historical quirk. */
6166 if ((h->dynindx != -1
6167 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6168 && ((finfo->info->shared
6169 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
6170 || h->root.type != bfd_link_hash_undefweak))
6171 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6172 && elf_hash_table (finfo->info)->dynamic_sections_created)
6174 if (! ((*bed->elf_backend_finish_dynamic_symbol)
6175 (finfo->output_bfd, finfo->info, h, &sym)))
6177 eoinfo->failed = TRUE;
6182 /* If we are marking the symbol as undefined, and there are no
6183 non-weak references to this symbol from a regular object, then
6184 mark the symbol as weak undefined; if there are non-weak
6185 references, mark the symbol as strong. We can't do this earlier,
6186 because it might not be marked as undefined until the
6187 finish_dynamic_symbol routine gets through with it. */
6188 if (sym.st_shndx == SHN_UNDEF
6189 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
6190 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
6191 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
6195 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
6196 bindtype = STB_GLOBAL;
6198 bindtype = STB_WEAK;
6199 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
6202 /* If a non-weak symbol with non-default visibility is not defined
6203 locally, it is a fatal error. */
6204 if (! finfo->info->relocatable
6205 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
6206 && ELF_ST_BIND (sym.st_info) != STB_WEAK
6207 && h->root.type == bfd_link_hash_undefined
6208 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6210 (*_bfd_error_handler)
6211 (_("%s: %s symbol `%s' isn't defined"),
6212 bfd_get_filename (finfo->output_bfd),
6213 ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED
6215 : ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL
6216 ? "internal" : "hidden",
6217 h->root.root.string);
6218 eoinfo->failed = TRUE;
6222 /* If this symbol should be put in the .dynsym section, then put it
6223 there now. We already know the symbol index. We also fill in
6224 the entry in the .hash section. */
6225 if (h->dynindx != -1
6226 && elf_hash_table (finfo->info)->dynamic_sections_created)
6230 size_t hash_entry_size;
6231 bfd_byte *bucketpos;
6235 sym.st_name = h->dynstr_index;
6236 esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
6237 bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
6239 bucketcount = elf_hash_table (finfo->info)->bucketcount;
6240 bucket = h->elf_hash_value % bucketcount;
6242 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
6243 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
6244 + (bucket + 2) * hash_entry_size);
6245 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
6246 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
6247 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
6248 ((bfd_byte *) finfo->hash_sec->contents
6249 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
6251 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
6253 Elf_Internal_Versym iversym;
6254 Elf_External_Versym *eversym;
6256 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6258 if (h->verinfo.verdef == NULL)
6259 iversym.vs_vers = 0;
6261 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
6265 if (h->verinfo.vertree == NULL)
6266 iversym.vs_vers = 1;
6268 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
6271 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
6272 iversym.vs_vers |= VERSYM_HIDDEN;
6274 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
6275 eversym += h->dynindx;
6276 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
6280 /* If we're stripping it, then it was just a dynamic symbol, and
6281 there's nothing else to do. */
6282 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
6285 h->indx = bfd_get_symcount (finfo->output_bfd);
6287 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h))
6289 eoinfo->failed = TRUE;
6296 /* Return TRUE if special handling is done for relocs in SEC against
6297 symbols defined in discarded sections. */
6300 elf_section_ignore_discarded_relocs (asection *sec)
6302 const struct elf_backend_data *bed;
6304 switch (sec->sec_info_type)
6306 case ELF_INFO_TYPE_STABS:
6307 case ELF_INFO_TYPE_EH_FRAME:
6313 bed = get_elf_backend_data (sec->owner);
6314 if (bed->elf_backend_ignore_discarded_relocs != NULL
6315 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
6321 /* Return TRUE if we should complain about a reloc in SEC against a
6322 symbol defined in a discarded section. */
6325 elf_section_complain_discarded (asection *sec)
6327 if (strncmp (".stab", sec->name, 5) == 0
6328 && (!sec->name[5] ||
6329 (sec->name[5] == '.' && ISDIGIT (sec->name[6]))))
6332 if (strcmp (".eh_frame", sec->name) == 0)
6335 if (strcmp (".gcc_except_table", sec->name) == 0)
6338 if (strcmp (".PARISC.unwind", sec->name) == 0)
6344 /* Link an input file into the linker output file. This function
6345 handles all the sections and relocations of the input file at once.
6346 This is so that we only have to read the local symbols once, and
6347 don't have to keep them in memory. */
6350 elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
6352 bfd_boolean (*relocate_section)
6353 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
6354 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
6356 Elf_Internal_Shdr *symtab_hdr;
6359 Elf_Internal_Sym *isymbuf;
6360 Elf_Internal_Sym *isym;
6361 Elf_Internal_Sym *isymend;
6363 asection **ppsection;
6365 const struct elf_backend_data *bed;
6366 bfd_boolean emit_relocs;
6367 struct elf_link_hash_entry **sym_hashes;
6369 output_bfd = finfo->output_bfd;
6370 bed = get_elf_backend_data (output_bfd);
6371 relocate_section = bed->elf_backend_relocate_section;
6373 /* If this is a dynamic object, we don't want to do anything here:
6374 we don't want the local symbols, and we don't want the section
6376 if ((input_bfd->flags & DYNAMIC) != 0)
6379 emit_relocs = (finfo->info->relocatable
6380 || finfo->info->emitrelocations
6381 || bed->elf_backend_emit_relocs);
6383 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6384 if (elf_bad_symtab (input_bfd))
6386 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
6391 locsymcount = symtab_hdr->sh_info;
6392 extsymoff = symtab_hdr->sh_info;
6395 /* Read the local symbols. */
6396 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
6397 if (isymbuf == NULL && locsymcount != 0)
6399 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
6400 finfo->internal_syms,
6401 finfo->external_syms,
6402 finfo->locsym_shndx);
6403 if (isymbuf == NULL)
6407 /* Find local symbol sections and adjust values of symbols in
6408 SEC_MERGE sections. Write out those local symbols we know are
6409 going into the output file. */
6410 isymend = isymbuf + locsymcount;
6411 for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
6413 isym++, pindex++, ppsection++)
6417 Elf_Internal_Sym osym;
6421 if (elf_bad_symtab (input_bfd))
6423 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
6430 if (isym->st_shndx == SHN_UNDEF)
6431 isec = bfd_und_section_ptr;
6432 else if (isym->st_shndx < SHN_LORESERVE
6433 || isym->st_shndx > SHN_HIRESERVE)
6435 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
6437 && isec->sec_info_type == ELF_INFO_TYPE_MERGE
6438 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
6440 _bfd_merged_section_offset (output_bfd, &isec,
6441 elf_section_data (isec)->sec_info,
6444 else if (isym->st_shndx == SHN_ABS)
6445 isec = bfd_abs_section_ptr;
6446 else if (isym->st_shndx == SHN_COMMON)
6447 isec = bfd_com_section_ptr;
6456 /* Don't output the first, undefined, symbol. */
6457 if (ppsection == finfo->sections)
6460 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6462 /* We never output section symbols. Instead, we use the
6463 section symbol of the corresponding section in the output
6468 /* If we are stripping all symbols, we don't want to output this
6470 if (finfo->info->strip == strip_all)
6473 /* If we are discarding all local symbols, we don't want to
6474 output this one. If we are generating a relocatable output
6475 file, then some of the local symbols may be required by
6476 relocs; we output them below as we discover that they are
6478 if (finfo->info->discard == discard_all)
6481 /* If this symbol is defined in a section which we are
6482 discarding, we don't need to keep it, but note that
6483 linker_mark is only reliable for sections that have contents.
6484 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6485 as well as linker_mark. */
6486 if ((isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
6488 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
6489 || (! finfo->info->relocatable
6490 && (isec->flags & SEC_EXCLUDE) != 0)))
6493 /* Get the name of the symbol. */
6494 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
6499 /* See if we are discarding symbols with this name. */
6500 if ((finfo->info->strip == strip_some
6501 && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
6503 || (((finfo->info->discard == discard_sec_merge
6504 && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
6505 || finfo->info->discard == discard_l)
6506 && bfd_is_local_label_name (input_bfd, name)))
6509 /* If we get here, we are going to output this symbol. */
6513 /* Adjust the section index for the output file. */
6514 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
6515 isec->output_section);
6516 if (osym.st_shndx == SHN_BAD)
6519 *pindex = bfd_get_symcount (output_bfd);
6521 /* ELF symbols in relocatable files are section relative, but
6522 in executable files they are virtual addresses. Note that
6523 this code assumes that all ELF sections have an associated
6524 BFD section with a reasonable value for output_offset; below
6525 we assume that they also have a reasonable value for
6526 output_section. Any special sections must be set up to meet
6527 these requirements. */
6528 osym.st_value += isec->output_offset;
6529 if (! finfo->info->relocatable)
6531 osym.st_value += isec->output_section->vma;
6532 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
6534 /* STT_TLS symbols are relative to PT_TLS segment base. */
6535 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
6536 osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
6540 if (! elf_link_output_sym (finfo, name, &osym, isec, NULL))
6544 /* Relocate the contents of each section. */
6545 sym_hashes = elf_sym_hashes (input_bfd);
6546 for (o = input_bfd->sections; o != NULL; o = o->next)
6550 if (! o->linker_mark)
6552 /* This section was omitted from the link. */
6556 if ((o->flags & SEC_HAS_CONTENTS) == 0
6557 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
6560 if ((o->flags & SEC_LINKER_CREATED) != 0)
6562 /* Section was created by _bfd_elf_link_create_dynamic_sections
6567 /* Get the contents of the section. They have been cached by a
6568 relaxation routine. Note that o is a section in an input
6569 file, so the contents field will not have been set by any of
6570 the routines which work on output files. */
6571 if (elf_section_data (o)->this_hdr.contents != NULL)
6572 contents = elf_section_data (o)->this_hdr.contents;
6575 bfd_size_type amt = o->rawsize ? o->rawsize : o->size;
6577 contents = finfo->contents;
6578 if (! bfd_get_section_contents (input_bfd, o, contents, 0, amt))
6582 if ((o->flags & SEC_RELOC) != 0)
6584 Elf_Internal_Rela *internal_relocs;
6585 bfd_vma r_type_mask;
6588 /* Get the swapped relocs. */
6590 = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
6591 finfo->internal_relocs, FALSE);
6592 if (internal_relocs == NULL
6593 && o->reloc_count > 0)
6596 if (bed->s->arch_size == 32)
6603 r_type_mask = 0xffffffff;
6607 /* Run through the relocs looking for any against symbols
6608 from discarded sections and section symbols from
6609 removed link-once sections. Complain about relocs
6610 against discarded sections. Zero relocs against removed
6611 link-once sections. Preserve debug information as much
6613 if (!elf_section_ignore_discarded_relocs (o))
6615 Elf_Internal_Rela *rel, *relend;
6616 bfd_boolean complain = elf_section_complain_discarded (o);
6618 rel = internal_relocs;
6619 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
6620 for ( ; rel < relend; rel++)
6622 unsigned long r_symndx = rel->r_info >> r_sym_shift;
6623 asection **ps, *sec;
6624 struct elf_link_hash_entry *h = NULL;
6625 const char *sym_name;
6627 if (r_symndx >= locsymcount
6628 || (elf_bad_symtab (input_bfd)
6629 && finfo->sections[r_symndx] == NULL))
6631 h = sym_hashes[r_symndx - extsymoff];
6632 while (h->root.type == bfd_link_hash_indirect
6633 || h->root.type == bfd_link_hash_warning)
6634 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6636 if (h->root.type != bfd_link_hash_defined
6637 && h->root.type != bfd_link_hash_defweak)
6640 ps = &h->root.u.def.section;
6641 sym_name = h->root.root.string;
6645 Elf_Internal_Sym *sym = isymbuf + r_symndx;
6646 ps = &finfo->sections[r_symndx];
6647 sym_name = bfd_elf_local_sym_name (input_bfd, sym);
6650 /* Complain if the definition comes from a
6651 discarded section. */
6652 if ((sec = *ps) != NULL && elf_discarded_section (sec))
6654 if ((o->flags & SEC_DEBUGGING) != 0)
6656 BFD_ASSERT (r_symndx != 0);
6658 /* Try to preserve debug information.
6659 FIXME: This is quite broken. Modifying
6660 the symbol here means we will be changing
6661 all uses of the symbol, not just those in
6662 debug sections. The only thing that makes
6663 this half reasonable is that debug sections
6664 tend to come after other sections. Of
6665 course, that doesn't help with globals.
6666 ??? All link-once sections of the same name
6667 ought to define the same set of symbols, so
6668 it would seem that globals ought to always
6669 be defined in the kept section. */
6670 if (sec->kept_section != NULL
6671 && sec->size == sec->kept_section->size)
6673 *ps = sec->kept_section;
6680 = bfd_get_section_ident (o);
6682 = bfd_get_section_ident (sec);
6683 finfo->info->callbacks->error_handler
6684 (LD_DEFINITION_IN_DISCARDED_SECTION,
6685 _("`%T' referenced in section `%s' of %B: "
6686 "defined in discarded section `%s' of %B\n"),
6688 r_sec ? r_sec : o->name, input_bfd,
6689 d_sec ? d_sec : sec->name, sec->owner);
6696 /* Remove the symbol reference from the reloc, but
6697 don't kill the reloc completely. This is so that
6698 a zero value will be written into the section,
6699 which may have non-zero contents put there by the
6700 assembler. Zero in things like an eh_frame fde
6701 pc_begin allows stack unwinders to recognize the
6703 rel->r_info &= r_type_mask;
6709 /* Relocate the section by invoking a back end routine.
6711 The back end routine is responsible for adjusting the
6712 section contents as necessary, and (if using Rela relocs
6713 and generating a relocatable output file) adjusting the
6714 reloc addend as necessary.
6716 The back end routine does not have to worry about setting
6717 the reloc address or the reloc symbol index.
6719 The back end routine is given a pointer to the swapped in
6720 internal symbols, and can access the hash table entries
6721 for the external symbols via elf_sym_hashes (input_bfd).
6723 When generating relocatable output, the back end routine
6724 must handle STB_LOCAL/STT_SECTION symbols specially. The
6725 output symbol is going to be a section symbol
6726 corresponding to the output section, which will require
6727 the addend to be adjusted. */
6729 if (! (*relocate_section) (output_bfd, finfo->info,
6730 input_bfd, o, contents,
6738 Elf_Internal_Rela *irela;
6739 Elf_Internal_Rela *irelaend;
6740 bfd_vma last_offset;
6741 struct elf_link_hash_entry **rel_hash;
6742 Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
6743 unsigned int next_erel;
6744 bfd_boolean (*reloc_emitter)
6745 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *);
6746 bfd_boolean rela_normal;
6748 input_rel_hdr = &elf_section_data (o)->rel_hdr;
6749 rela_normal = (bed->rela_normal
6750 && (input_rel_hdr->sh_entsize
6751 == bed->s->sizeof_rela));
6753 /* Adjust the reloc addresses and symbol indices. */
6755 irela = internal_relocs;
6756 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
6757 rel_hash = (elf_section_data (o->output_section)->rel_hashes
6758 + elf_section_data (o->output_section)->rel_count
6759 + elf_section_data (o->output_section)->rel_count2);
6760 last_offset = o->output_offset;
6761 if (!finfo->info->relocatable)
6762 last_offset += o->output_section->vma;
6763 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
6765 unsigned long r_symndx;
6767 Elf_Internal_Sym sym;
6769 if (next_erel == bed->s->int_rels_per_ext_rel)
6775 irela->r_offset = _bfd_elf_section_offset (output_bfd,
6778 if (irela->r_offset >= (bfd_vma) -2)
6780 /* This is a reloc for a deleted entry or somesuch.
6781 Turn it into an R_*_NONE reloc, at the same
6782 offset as the last reloc. elf_eh_frame.c and
6783 elf_bfd_discard_info rely on reloc offsets
6785 irela->r_offset = last_offset;
6787 irela->r_addend = 0;
6791 irela->r_offset += o->output_offset;
6793 /* Relocs in an executable have to be virtual addresses. */
6794 if (!finfo->info->relocatable)
6795 irela->r_offset += o->output_section->vma;
6797 last_offset = irela->r_offset;
6799 r_symndx = irela->r_info >> r_sym_shift;
6800 if (r_symndx == STN_UNDEF)
6803 if (r_symndx >= locsymcount
6804 || (elf_bad_symtab (input_bfd)
6805 && finfo->sections[r_symndx] == NULL))
6807 struct elf_link_hash_entry *rh;
6810 /* This is a reloc against a global symbol. We
6811 have not yet output all the local symbols, so
6812 we do not know the symbol index of any global
6813 symbol. We set the rel_hash entry for this
6814 reloc to point to the global hash table entry
6815 for this symbol. The symbol index is then
6816 set at the end of elf_bfd_final_link. */
6817 indx = r_symndx - extsymoff;
6818 rh = elf_sym_hashes (input_bfd)[indx];
6819 while (rh->root.type == bfd_link_hash_indirect
6820 || rh->root.type == bfd_link_hash_warning)
6821 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
6823 /* Setting the index to -2 tells
6824 elf_link_output_extsym that this symbol is
6826 BFD_ASSERT (rh->indx < 0);
6834 /* This is a reloc against a local symbol. */
6837 sym = isymbuf[r_symndx];
6838 sec = finfo->sections[r_symndx];
6839 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
6841 /* I suppose the backend ought to fill in the
6842 section of any STT_SECTION symbol against a
6843 processor specific section. */
6845 if (bfd_is_abs_section (sec))
6847 else if (sec == NULL || sec->owner == NULL)
6849 bfd_set_error (bfd_error_bad_value);
6854 asection *osec = sec->output_section;
6856 /* If we have discarded a section, the output
6857 section will be the absolute section. In
6858 case of discarded link-once and discarded
6859 SEC_MERGE sections, use the kept section. */
6860 if (bfd_is_abs_section (osec)
6861 && sec->kept_section != NULL
6862 && sec->kept_section->output_section != NULL)
6864 osec = sec->kept_section->output_section;
6865 irela->r_addend -= osec->vma;
6868 if (!bfd_is_abs_section (osec))
6870 r_symndx = osec->target_index;
6871 BFD_ASSERT (r_symndx != 0);
6875 /* Adjust the addend according to where the
6876 section winds up in the output section. */
6878 irela->r_addend += sec->output_offset;
6882 if (finfo->indices[r_symndx] == -1)
6884 unsigned long shlink;
6888 if (finfo->info->strip == strip_all)
6890 /* You can't do ld -r -s. */
6891 bfd_set_error (bfd_error_invalid_operation);
6895 /* This symbol was skipped earlier, but
6896 since it is needed by a reloc, we
6897 must output it now. */
6898 shlink = symtab_hdr->sh_link;
6899 name = (bfd_elf_string_from_elf_section
6900 (input_bfd, shlink, sym.st_name));
6904 osec = sec->output_section;
6906 _bfd_elf_section_from_bfd_section (output_bfd,
6908 if (sym.st_shndx == SHN_BAD)
6911 sym.st_value += sec->output_offset;
6912 if (! finfo->info->relocatable)
6914 sym.st_value += osec->vma;
6915 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
6917 /* STT_TLS symbols are relative to PT_TLS
6919 BFD_ASSERT (elf_hash_table (finfo->info)
6921 sym.st_value -= (elf_hash_table (finfo->info)
6926 finfo->indices[r_symndx]
6927 = bfd_get_symcount (output_bfd);
6929 if (! elf_link_output_sym (finfo, name, &sym, sec,
6934 r_symndx = finfo->indices[r_symndx];
6937 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
6938 | (irela->r_info & r_type_mask));
6941 /* Swap out the relocs. */
6942 if (bed->elf_backend_emit_relocs
6943 && !(finfo->info->relocatable
6944 || finfo->info->emitrelocations))
6945 reloc_emitter = bed->elf_backend_emit_relocs;
6947 reloc_emitter = _bfd_elf_link_output_relocs;
6949 if (input_rel_hdr->sh_size != 0
6950 && ! (*reloc_emitter) (output_bfd, o, input_rel_hdr,
6954 input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
6955 if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
6957 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
6958 * bed->s->int_rels_per_ext_rel);
6959 if (! (*reloc_emitter) (output_bfd, o, input_rel_hdr2,
6966 /* Write out the modified section contents. */
6967 if (bed->elf_backend_write_section
6968 && (*bed->elf_backend_write_section) (output_bfd, o, contents))
6970 /* Section written out. */
6972 else switch (o->sec_info_type)
6974 case ELF_INFO_TYPE_STABS:
6975 if (! (_bfd_write_section_stabs
6977 &elf_hash_table (finfo->info)->stab_info,
6978 o, &elf_section_data (o)->sec_info, contents)))
6981 case ELF_INFO_TYPE_MERGE:
6982 if (! _bfd_write_merged_section (output_bfd, o,
6983 elf_section_data (o)->sec_info))
6986 case ELF_INFO_TYPE_EH_FRAME:
6988 if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
6995 if (! (o->flags & SEC_EXCLUDE)
6996 && ! bfd_set_section_contents (output_bfd, o->output_section,
6998 (file_ptr) o->output_offset,
7009 /* Generate a reloc when linking an ELF file. This is a reloc
7010 requested by the linker, and does come from any input file. This
7011 is used to build constructor and destructor tables when linking
7015 elf_reloc_link_order (bfd *output_bfd,
7016 struct bfd_link_info *info,
7017 asection *output_section,
7018 struct bfd_link_order *link_order)
7020 reloc_howto_type *howto;
7024 struct elf_link_hash_entry **rel_hash_ptr;
7025 Elf_Internal_Shdr *rel_hdr;
7026 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7027 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
7031 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
7034 bfd_set_error (bfd_error_bad_value);
7038 addend = link_order->u.reloc.p->addend;
7040 /* Figure out the symbol index. */
7041 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
7042 + elf_section_data (output_section)->rel_count
7043 + elf_section_data (output_section)->rel_count2);
7044 if (link_order->type == bfd_section_reloc_link_order)
7046 indx = link_order->u.reloc.p->u.section->target_index;
7047 BFD_ASSERT (indx != 0);
7048 *rel_hash_ptr = NULL;
7052 struct elf_link_hash_entry *h;
7054 /* Treat a reloc against a defined symbol as though it were
7055 actually against the section. */
7056 h = ((struct elf_link_hash_entry *)
7057 bfd_wrapped_link_hash_lookup (output_bfd, info,
7058 link_order->u.reloc.p->u.name,
7059 FALSE, FALSE, TRUE));
7061 && (h->root.type == bfd_link_hash_defined
7062 || h->root.type == bfd_link_hash_defweak))
7066 section = h->root.u.def.section;
7067 indx = section->output_section->target_index;
7068 *rel_hash_ptr = NULL;
7069 /* It seems that we ought to add the symbol value to the
7070 addend here, but in practice it has already been added
7071 because it was passed to constructor_callback. */
7072 addend += section->output_section->vma + section->output_offset;
7076 /* Setting the index to -2 tells elf_link_output_extsym that
7077 this symbol is used by a reloc. */
7084 if (! ((*info->callbacks->unattached_reloc)
7085 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
7091 /* If this is an inplace reloc, we must write the addend into the
7093 if (howto->partial_inplace && addend != 0)
7096 bfd_reloc_status_type rstat;
7099 const char *sym_name;
7101 size = bfd_get_reloc_size (howto);
7102 buf = bfd_zmalloc (size);
7105 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
7112 case bfd_reloc_outofrange:
7115 case bfd_reloc_overflow:
7116 if (link_order->type == bfd_section_reloc_link_order)
7117 sym_name = bfd_section_name (output_bfd,
7118 link_order->u.reloc.p->u.section);
7120 sym_name = link_order->u.reloc.p->u.name;
7121 if (! ((*info->callbacks->reloc_overflow)
7122 (info, sym_name, howto->name, addend, NULL, NULL, 0)))
7129 ok = bfd_set_section_contents (output_bfd, output_section, buf,
7130 link_order->offset, size);
7136 /* The address of a reloc is relative to the section in a
7137 relocatable file, and is a virtual address in an executable
7139 offset = link_order->offset;
7140 if (! info->relocatable)
7141 offset += output_section->vma;
7143 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7145 irel[i].r_offset = offset;
7147 irel[i].r_addend = 0;
7149 if (bed->s->arch_size == 32)
7150 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
7152 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
7154 rel_hdr = &elf_section_data (output_section)->rel_hdr;
7155 erel = rel_hdr->contents;
7156 if (rel_hdr->sh_type == SHT_REL)
7158 erel += (elf_section_data (output_section)->rel_count
7159 * bed->s->sizeof_rel);
7160 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
7164 irel[0].r_addend = addend;
7165 erel += (elf_section_data (output_section)->rel_count
7166 * bed->s->sizeof_rela);
7167 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
7170 ++elf_section_data (output_section)->rel_count;
7176 /* Get the output vma of the section pointed to by the sh_link field. */
7179 elf_get_linked_section_vma (struct bfd_link_order *p)
7181 Elf_Internal_Shdr **elf_shdrp;
7185 s = p->u.indirect.section;
7186 elf_shdrp = elf_elfsections (s->owner);
7187 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
7188 elfsec = elf_shdrp[elfsec]->sh_link;
7189 s = elf_shdrp[elfsec]->bfd_section;
7190 return s->output_section->vma + s->output_offset;
7194 /* Compare two sections based on the locations of the sections they are
7195 linked to. Used by elf_fixup_link_order. */
7198 compare_link_order (const void * a, const void * b)
7203 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
7204 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
7211 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
7212 order as their linked sections. Returns false if this could not be done
7213 because an output section includes both ordered and unordered
7214 sections. Ideally we'd do this in the linker proper. */
7217 elf_fixup_link_order (bfd *abfd, asection *o)
7222 struct bfd_link_order *p;
7224 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7226 struct bfd_link_order **sections;
7232 for (p = o->link_order_head; p != NULL; p = p->next)
7234 if (p->type == bfd_indirect_link_order
7235 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
7236 == bfd_target_elf_flavour)
7237 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
7239 s = p->u.indirect.section;
7240 elfsec = _bfd_elf_section_from_bfd_section (sub, s);
7242 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER)
7251 if (!seen_linkorder)
7254 if (seen_other && seen_linkorder)
7256 (*_bfd_error_handler) ("%s: has both ordered and unordered sections",
7258 bfd_set_error (bfd_error_bad_value);
7262 sections = (struct bfd_link_order **)
7263 xmalloc (seen_linkorder * sizeof (struct bfd_link_order *));
7266 for (p = o->link_order_head; p != NULL; p = p->next)
7268 sections[seen_linkorder++] = p;
7270 /* Sort the input sections in the order of their linked section. */
7271 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
7272 compare_link_order);
7274 /* Change the offsets of the sections. */
7276 for (n = 0; n < seen_linkorder; n++)
7278 s = sections[n]->u.indirect.section;
7279 offset &= ~(bfd_vma)((1 << s->alignment_power) - 1);
7280 s->output_offset = offset;
7281 sections[n]->offset = offset;
7282 offset += sections[n]->size;
7289 /* Do the final step of an ELF link. */
7292 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
7294 bfd_boolean dynamic;
7295 bfd_boolean emit_relocs;
7297 struct elf_final_link_info finfo;
7298 register asection *o;
7299 register struct bfd_link_order *p;
7301 bfd_size_type max_contents_size;
7302 bfd_size_type max_external_reloc_size;
7303 bfd_size_type max_internal_reloc_count;
7304 bfd_size_type max_sym_count;
7305 bfd_size_type max_sym_shndx_count;
7307 Elf_Internal_Sym elfsym;
7309 Elf_Internal_Shdr *symtab_hdr;
7310 Elf_Internal_Shdr *symtab_shndx_hdr;
7311 Elf_Internal_Shdr *symstrtab_hdr;
7312 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7313 struct elf_outext_info eoinfo;
7315 size_t relativecount = 0;
7316 asection *reldyn = 0;
7319 if (! is_elf_hash_table (info->hash))
7323 abfd->flags |= DYNAMIC;
7325 dynamic = elf_hash_table (info)->dynamic_sections_created;
7326 dynobj = elf_hash_table (info)->dynobj;
7328 emit_relocs = (info->relocatable
7329 || info->emitrelocations
7330 || bed->elf_backend_emit_relocs);
7333 finfo.output_bfd = abfd;
7334 finfo.symstrtab = _bfd_elf_stringtab_init ();
7335 if (finfo.symstrtab == NULL)
7340 finfo.dynsym_sec = NULL;
7341 finfo.hash_sec = NULL;
7342 finfo.symver_sec = NULL;
7346 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
7347 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
7348 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
7349 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
7350 /* Note that it is OK if symver_sec is NULL. */
7353 finfo.contents = NULL;
7354 finfo.external_relocs = NULL;
7355 finfo.internal_relocs = NULL;
7356 finfo.external_syms = NULL;
7357 finfo.locsym_shndx = NULL;
7358 finfo.internal_syms = NULL;
7359 finfo.indices = NULL;
7360 finfo.sections = NULL;
7361 finfo.symbuf = NULL;
7362 finfo.symshndxbuf = NULL;
7363 finfo.symbuf_count = 0;
7364 finfo.shndxbuf_size = 0;
7366 /* Count up the number of relocations we will output for each output
7367 section, so that we know the sizes of the reloc sections. We
7368 also figure out some maximum sizes. */
7369 max_contents_size = 0;
7370 max_external_reloc_size = 0;
7371 max_internal_reloc_count = 0;
7373 max_sym_shndx_count = 0;
7375 for (o = abfd->sections; o != NULL; o = o->next)
7377 struct bfd_elf_section_data *esdo = elf_section_data (o);
7380 for (p = o->link_order_head; p != NULL; p = p->next)
7382 unsigned int reloc_count = 0;
7383 struct bfd_elf_section_data *esdi = NULL;
7384 unsigned int *rel_count1;
7386 if (p->type == bfd_section_reloc_link_order
7387 || p->type == bfd_symbol_reloc_link_order)
7389 else if (p->type == bfd_indirect_link_order)
7393 sec = p->u.indirect.section;
7394 esdi = elf_section_data (sec);
7396 /* Mark all sections which are to be included in the
7397 link. This will normally be every section. We need
7398 to do this so that we can identify any sections which
7399 the linker has decided to not include. */
7400 sec->linker_mark = TRUE;
7402 if (sec->flags & SEC_MERGE)
7405 if (info->relocatable || info->emitrelocations)
7406 reloc_count = sec->reloc_count;
7407 else if (bed->elf_backend_count_relocs)
7409 Elf_Internal_Rela * relocs;
7411 relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
7414 reloc_count = (*bed->elf_backend_count_relocs) (sec, relocs);
7416 if (elf_section_data (o)->relocs != relocs)
7420 if (sec->rawsize > max_contents_size)
7421 max_contents_size = sec->rawsize;
7422 if (sec->size > max_contents_size)
7423 max_contents_size = sec->size;
7425 /* We are interested in just local symbols, not all
7427 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
7428 && (sec->owner->flags & DYNAMIC) == 0)
7432 if (elf_bad_symtab (sec->owner))
7433 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
7434 / bed->s->sizeof_sym);
7436 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
7438 if (sym_count > max_sym_count)
7439 max_sym_count = sym_count;
7441 if (sym_count > max_sym_shndx_count
7442 && elf_symtab_shndx (sec->owner) != 0)
7443 max_sym_shndx_count = sym_count;
7445 if ((sec->flags & SEC_RELOC) != 0)
7449 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
7450 if (ext_size > max_external_reloc_size)
7451 max_external_reloc_size = ext_size;
7452 if (sec->reloc_count > max_internal_reloc_count)
7453 max_internal_reloc_count = sec->reloc_count;
7458 if (reloc_count == 0)
7461 o->reloc_count += reloc_count;
7463 /* MIPS may have a mix of REL and RELA relocs on sections.
7464 To support this curious ABI we keep reloc counts in
7465 elf_section_data too. We must be careful to add the
7466 relocations from the input section to the right output
7467 count. FIXME: Get rid of one count. We have
7468 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
7469 rel_count1 = &esdo->rel_count;
7472 bfd_boolean same_size;
7473 bfd_size_type entsize1;
7475 entsize1 = esdi->rel_hdr.sh_entsize;
7476 BFD_ASSERT (entsize1 == bed->s->sizeof_rel
7477 || entsize1 == bed->s->sizeof_rela);
7478 same_size = !o->use_rela_p == (entsize1 == bed->s->sizeof_rel);
7481 rel_count1 = &esdo->rel_count2;
7483 if (esdi->rel_hdr2 != NULL)
7485 bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize;
7486 unsigned int alt_count;
7487 unsigned int *rel_count2;
7489 BFD_ASSERT (entsize2 != entsize1
7490 && (entsize2 == bed->s->sizeof_rel
7491 || entsize2 == bed->s->sizeof_rela));
7493 rel_count2 = &esdo->rel_count2;
7495 rel_count2 = &esdo->rel_count;
7497 /* The following is probably too simplistic if the
7498 backend counts output relocs unusually. */
7499 BFD_ASSERT (bed->elf_backend_count_relocs == NULL);
7500 alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2);
7501 *rel_count2 += alt_count;
7502 reloc_count -= alt_count;
7505 *rel_count1 += reloc_count;
7508 if (o->reloc_count > 0)
7509 o->flags |= SEC_RELOC;
7512 /* Explicitly clear the SEC_RELOC flag. The linker tends to
7513 set it (this is probably a bug) and if it is set
7514 assign_section_numbers will create a reloc section. */
7515 o->flags &=~ SEC_RELOC;
7518 /* If the SEC_ALLOC flag is not set, force the section VMA to
7519 zero. This is done in elf_fake_sections as well, but forcing
7520 the VMA to 0 here will ensure that relocs against these
7521 sections are handled correctly. */
7522 if ((o->flags & SEC_ALLOC) == 0
7523 && ! o->user_set_vma)
7527 if (! info->relocatable && merged)
7528 elf_link_hash_traverse (elf_hash_table (info),
7529 _bfd_elf_link_sec_merge_syms, abfd);
7531 /* Figure out the file positions for everything but the symbol table
7532 and the relocs. We set symcount to force assign_section_numbers
7533 to create a symbol table. */
7534 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
7535 BFD_ASSERT (! abfd->output_has_begun);
7536 if (! _bfd_elf_compute_section_file_positions (abfd, info))
7539 /* That created the reloc sections. Set their sizes, and assign
7540 them file positions, and allocate some buffers. */
7541 for (o = abfd->sections; o != NULL; o = o->next)
7543 if ((o->flags & SEC_RELOC) != 0)
7545 if (!(_bfd_elf_link_size_reloc_section
7546 (abfd, &elf_section_data (o)->rel_hdr, o)))
7549 if (elf_section_data (o)->rel_hdr2
7550 && !(_bfd_elf_link_size_reloc_section
7551 (abfd, elf_section_data (o)->rel_hdr2, o)))
7555 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
7556 to count upwards while actually outputting the relocations. */
7557 elf_section_data (o)->rel_count = 0;
7558 elf_section_data (o)->rel_count2 = 0;
7561 _bfd_elf_assign_file_positions_for_relocs (abfd);
7563 /* We have now assigned file positions for all the sections except
7564 .symtab and .strtab. We start the .symtab section at the current
7565 file position, and write directly to it. We build the .strtab
7566 section in memory. */
7567 bfd_get_symcount (abfd) = 0;
7568 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
7569 /* sh_name is set in prep_headers. */
7570 symtab_hdr->sh_type = SHT_SYMTAB;
7571 /* sh_flags, sh_addr and sh_size all start off zero. */
7572 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
7573 /* sh_link is set in assign_section_numbers. */
7574 /* sh_info is set below. */
7575 /* sh_offset is set just below. */
7576 symtab_hdr->sh_addralign = 1 << bed->s->log_file_align;
7578 off = elf_tdata (abfd)->next_file_pos;
7579 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
7581 /* Note that at this point elf_tdata (abfd)->next_file_pos is
7582 incorrect. We do not yet know the size of the .symtab section.
7583 We correct next_file_pos below, after we do know the size. */
7585 /* Allocate a buffer to hold swapped out symbols. This is to avoid
7586 continuously seeking to the right position in the file. */
7587 if (! info->keep_memory || max_sym_count < 20)
7588 finfo.symbuf_size = 20;
7590 finfo.symbuf_size = max_sym_count;
7591 amt = finfo.symbuf_size;
7592 amt *= bed->s->sizeof_sym;
7593 finfo.symbuf = bfd_malloc (amt);
7594 if (finfo.symbuf == NULL)
7596 if (elf_numsections (abfd) > SHN_LORESERVE)
7598 /* Wild guess at number of output symbols. realloc'd as needed. */
7599 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
7600 finfo.shndxbuf_size = amt;
7601 amt *= sizeof (Elf_External_Sym_Shndx);
7602 finfo.symshndxbuf = bfd_zmalloc (amt);
7603 if (finfo.symshndxbuf == NULL)
7607 /* Start writing out the symbol table. The first symbol is always a
7609 if (info->strip != strip_all
7612 elfsym.st_value = 0;
7615 elfsym.st_other = 0;
7616 elfsym.st_shndx = SHN_UNDEF;
7617 if (! elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr,
7623 /* Some standard ELF linkers do this, but we don't because it causes
7624 bootstrap comparison failures. */
7625 /* Output a file symbol for the output file as the second symbol.
7626 We output this even if we are discarding local symbols, although
7627 I'm not sure if this is correct. */
7628 elfsym.st_value = 0;
7630 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
7631 elfsym.st_other = 0;
7632 elfsym.st_shndx = SHN_ABS;
7633 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
7634 &elfsym, bfd_abs_section_ptr, NULL))
7638 /* Output a symbol for each section. We output these even if we are
7639 discarding local symbols, since they are used for relocs. These
7640 symbols have no names. We store the index of each one in the
7641 index field of the section, so that we can find it again when
7642 outputting relocs. */
7643 if (info->strip != strip_all
7647 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
7648 elfsym.st_other = 0;
7649 for (i = 1; i < elf_numsections (abfd); i++)
7651 o = bfd_section_from_elf_index (abfd, i);
7653 o->target_index = bfd_get_symcount (abfd);
7654 elfsym.st_shndx = i;
7655 if (info->relocatable || o == NULL)
7656 elfsym.st_value = 0;
7658 elfsym.st_value = o->vma;
7659 if (! elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL))
7661 if (i == SHN_LORESERVE - 1)
7662 i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
7666 /* Allocate some memory to hold information read in from the input
7668 if (max_contents_size != 0)
7670 finfo.contents = bfd_malloc (max_contents_size);
7671 if (finfo.contents == NULL)
7675 if (max_external_reloc_size != 0)
7677 finfo.external_relocs = bfd_malloc (max_external_reloc_size);
7678 if (finfo.external_relocs == NULL)
7682 if (max_internal_reloc_count != 0)
7684 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
7685 amt *= sizeof (Elf_Internal_Rela);
7686 finfo.internal_relocs = bfd_malloc (amt);
7687 if (finfo.internal_relocs == NULL)
7691 if (max_sym_count != 0)
7693 amt = max_sym_count * bed->s->sizeof_sym;
7694 finfo.external_syms = bfd_malloc (amt);
7695 if (finfo.external_syms == NULL)
7698 amt = max_sym_count * sizeof (Elf_Internal_Sym);
7699 finfo.internal_syms = bfd_malloc (amt);
7700 if (finfo.internal_syms == NULL)
7703 amt = max_sym_count * sizeof (long);
7704 finfo.indices = bfd_malloc (amt);
7705 if (finfo.indices == NULL)
7708 amt = max_sym_count * sizeof (asection *);
7709 finfo.sections = bfd_malloc (amt);
7710 if (finfo.sections == NULL)
7714 if (max_sym_shndx_count != 0)
7716 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
7717 finfo.locsym_shndx = bfd_malloc (amt);
7718 if (finfo.locsym_shndx == NULL)
7722 if (elf_hash_table (info)->tls_sec)
7724 bfd_vma base, end = 0;
7727 for (sec = elf_hash_table (info)->tls_sec;
7728 sec && (sec->flags & SEC_THREAD_LOCAL);
7731 bfd_vma size = sec->size;
7733 if (size == 0 && (sec->flags & SEC_HAS_CONTENTS) == 0)
7735 struct bfd_link_order *o;
7737 for (o = sec->link_order_head; o != NULL; o = o->next)
7738 if (size < o->offset + o->size)
7739 size = o->offset + o->size;
7741 end = sec->vma + size;
7743 base = elf_hash_table (info)->tls_sec->vma;
7744 end = align_power (end, elf_hash_table (info)->tls_sec->alignment_power);
7745 elf_hash_table (info)->tls_size = end - base;
7748 /* Reorder SHF_LINK_ORDER sections. */
7749 for (o = abfd->sections; o != NULL; o = o->next)
7751 if (!elf_fixup_link_order (abfd, o))
7755 /* Since ELF permits relocations to be against local symbols, we
7756 must have the local symbols available when we do the relocations.
7757 Since we would rather only read the local symbols once, and we
7758 would rather not keep them in memory, we handle all the
7759 relocations for a single input file at the same time.
7761 Unfortunately, there is no way to know the total number of local
7762 symbols until we have seen all of them, and the local symbol
7763 indices precede the global symbol indices. This means that when
7764 we are generating relocatable output, and we see a reloc against
7765 a global symbol, we can not know the symbol index until we have
7766 finished examining all the local symbols to see which ones we are
7767 going to output. To deal with this, we keep the relocations in
7768 memory, and don't output them until the end of the link. This is
7769 an unfortunate waste of memory, but I don't see a good way around
7770 it. Fortunately, it only happens when performing a relocatable
7771 link, which is not the common case. FIXME: If keep_memory is set
7772 we could write the relocs out and then read them again; I don't
7773 know how bad the memory loss will be. */
7775 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7776 sub->output_has_begun = FALSE;
7777 for (o = abfd->sections; o != NULL; o = o->next)
7779 for (p = o->link_order_head; p != NULL; p = p->next)
7781 if (p->type == bfd_indirect_link_order
7782 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
7783 == bfd_target_elf_flavour)
7784 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
7786 if (! sub->output_has_begun)
7788 if (! elf_link_input_bfd (&finfo, sub))
7790 sub->output_has_begun = TRUE;
7793 else if (p->type == bfd_section_reloc_link_order
7794 || p->type == bfd_symbol_reloc_link_order)
7796 if (! elf_reloc_link_order (abfd, info, o, p))
7801 if (! _bfd_default_link_order (abfd, info, o, p))
7807 /* Output any global symbols that got converted to local in a
7808 version script or due to symbol visibility. We do this in a
7809 separate step since ELF requires all local symbols to appear
7810 prior to any global symbols. FIXME: We should only do this if
7811 some global symbols were, in fact, converted to become local.
7812 FIXME: Will this work correctly with the Irix 5 linker? */
7813 eoinfo.failed = FALSE;
7814 eoinfo.finfo = &finfo;
7815 eoinfo.localsyms = TRUE;
7816 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
7821 /* That wrote out all the local symbols. Finish up the symbol table
7822 with the global symbols. Even if we want to strip everything we
7823 can, we still need to deal with those global symbols that got
7824 converted to local in a version script. */
7826 /* The sh_info field records the index of the first non local symbol. */
7827 symtab_hdr->sh_info = bfd_get_symcount (abfd);
7830 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
7832 Elf_Internal_Sym sym;
7833 bfd_byte *dynsym = finfo.dynsym_sec->contents;
7834 long last_local = 0;
7836 /* Write out the section symbols for the output sections. */
7843 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
7846 for (s = abfd->sections; s != NULL; s = s->next)
7852 dynindx = elf_section_data (s)->dynindx;
7855 indx = elf_section_data (s)->this_idx;
7856 BFD_ASSERT (indx > 0);
7857 sym.st_shndx = indx;
7858 sym.st_value = s->vma;
7859 dest = dynsym + dynindx * bed->s->sizeof_sym;
7860 if (last_local < dynindx)
7861 last_local = dynindx;
7862 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
7866 /* Write out the local dynsyms. */
7867 if (elf_hash_table (info)->dynlocal)
7869 struct elf_link_local_dynamic_entry *e;
7870 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
7875 sym.st_size = e->isym.st_size;
7876 sym.st_other = e->isym.st_other;
7878 /* Copy the internal symbol as is.
7879 Note that we saved a word of storage and overwrote
7880 the original st_name with the dynstr_index. */
7883 if (e->isym.st_shndx != SHN_UNDEF
7884 && (e->isym.st_shndx < SHN_LORESERVE
7885 || e->isym.st_shndx > SHN_HIRESERVE))
7887 s = bfd_section_from_elf_index (e->input_bfd,
7891 elf_section_data (s->output_section)->this_idx;
7892 sym.st_value = (s->output_section->vma
7894 + e->isym.st_value);
7897 if (last_local < e->dynindx)
7898 last_local = e->dynindx;
7900 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
7901 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
7905 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
7909 /* We get the global symbols from the hash table. */
7910 eoinfo.failed = FALSE;
7911 eoinfo.localsyms = FALSE;
7912 eoinfo.finfo = &finfo;
7913 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
7918 /* If backend needs to output some symbols not present in the hash
7919 table, do it now. */
7920 if (bed->elf_backend_output_arch_syms)
7922 typedef bfd_boolean (*out_sym_func)
7923 (void *, const char *, Elf_Internal_Sym *, asection *,
7924 struct elf_link_hash_entry *);
7926 if (! ((*bed->elf_backend_output_arch_syms)
7927 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
7931 /* Flush all symbols to the file. */
7932 if (! elf_link_flush_output_syms (&finfo, bed))
7935 /* Now we know the size of the symtab section. */
7936 off += symtab_hdr->sh_size;
7938 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
7939 if (symtab_shndx_hdr->sh_name != 0)
7941 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
7942 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
7943 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
7944 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
7945 symtab_shndx_hdr->sh_size = amt;
7947 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
7950 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
7951 || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt))
7956 /* Finish up and write out the symbol string table (.strtab)
7958 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
7959 /* sh_name was set in prep_headers. */
7960 symstrtab_hdr->sh_type = SHT_STRTAB;
7961 symstrtab_hdr->sh_flags = 0;
7962 symstrtab_hdr->sh_addr = 0;
7963 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
7964 symstrtab_hdr->sh_entsize = 0;
7965 symstrtab_hdr->sh_link = 0;
7966 symstrtab_hdr->sh_info = 0;
7967 /* sh_offset is set just below. */
7968 symstrtab_hdr->sh_addralign = 1;
7970 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
7971 elf_tdata (abfd)->next_file_pos = off;
7973 if (bfd_get_symcount (abfd) > 0)
7975 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
7976 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
7980 /* Adjust the relocs to have the correct symbol indices. */
7981 for (o = abfd->sections; o != NULL; o = o->next)
7983 if ((o->flags & SEC_RELOC) == 0)
7986 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
7987 elf_section_data (o)->rel_count,
7988 elf_section_data (o)->rel_hashes);
7989 if (elf_section_data (o)->rel_hdr2 != NULL)
7990 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
7991 elf_section_data (o)->rel_count2,
7992 (elf_section_data (o)->rel_hashes
7993 + elf_section_data (o)->rel_count));
7995 /* Set the reloc_count field to 0 to prevent write_relocs from
7996 trying to swap the relocs out itself. */
8000 if (dynamic && info->combreloc && dynobj != NULL)
8001 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
8003 /* If we are linking against a dynamic object, or generating a
8004 shared library, finish up the dynamic linking information. */
8007 bfd_byte *dyncon, *dynconend;
8009 /* Fix up .dynamic entries. */
8010 o = bfd_get_section_by_name (dynobj, ".dynamic");
8011 BFD_ASSERT (o != NULL);
8013 dyncon = o->contents;
8014 dynconend = o->contents + o->size;
8015 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
8017 Elf_Internal_Dyn dyn;
8021 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
8028 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
8030 switch (elf_section_data (reldyn)->this_hdr.sh_type)
8032 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
8033 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
8036 dyn.d_un.d_val = relativecount;
8043 name = info->init_function;
8046 name = info->fini_function;
8049 struct elf_link_hash_entry *h;
8051 h = elf_link_hash_lookup (elf_hash_table (info), name,
8052 FALSE, FALSE, TRUE);
8054 && (h->root.type == bfd_link_hash_defined
8055 || h->root.type == bfd_link_hash_defweak))
8057 dyn.d_un.d_val = h->root.u.def.value;
8058 o = h->root.u.def.section;
8059 if (o->output_section != NULL)
8060 dyn.d_un.d_val += (o->output_section->vma
8061 + o->output_offset);
8064 /* The symbol is imported from another shared
8065 library and does not apply to this one. */
8073 case DT_PREINIT_ARRAYSZ:
8074 name = ".preinit_array";
8076 case DT_INIT_ARRAYSZ:
8077 name = ".init_array";
8079 case DT_FINI_ARRAYSZ:
8080 name = ".fini_array";
8082 o = bfd_get_section_by_name (abfd, name);
8085 (*_bfd_error_handler)
8086 (_("%s: could not find output section %s"),
8087 bfd_get_filename (abfd), name);
8091 (*_bfd_error_handler)
8092 (_("warning: %s section has zero size"), name);
8093 dyn.d_un.d_val = o->size;
8096 case DT_PREINIT_ARRAY:
8097 name = ".preinit_array";
8100 name = ".init_array";
8103 name = ".fini_array";
8116 name = ".gnu.version_d";
8119 name = ".gnu.version_r";
8122 name = ".gnu.version";
8124 o = bfd_get_section_by_name (abfd, name);
8127 (*_bfd_error_handler)
8128 (_("%s: could not find output section %s"),
8129 bfd_get_filename (abfd), name);
8132 dyn.d_un.d_ptr = o->vma;
8139 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
8144 for (i = 1; i < elf_numsections (abfd); i++)
8146 Elf_Internal_Shdr *hdr;
8148 hdr = elf_elfsections (abfd)[i];
8149 if (hdr->sh_type == type
8150 && (hdr->sh_flags & SHF_ALLOC) != 0)
8152 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
8153 dyn.d_un.d_val += hdr->sh_size;
8156 if (dyn.d_un.d_val == 0
8157 || hdr->sh_addr < dyn.d_un.d_val)
8158 dyn.d_un.d_val = hdr->sh_addr;
8164 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
8168 /* If we have created any dynamic sections, then output them. */
8171 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
8174 for (o = dynobj->sections; o != NULL; o = o->next)
8176 if ((o->flags & SEC_HAS_CONTENTS) == 0
8178 || o->output_section == bfd_abs_section_ptr)
8180 if ((o->flags & SEC_LINKER_CREATED) == 0)
8182 /* At this point, we are only interested in sections
8183 created by _bfd_elf_link_create_dynamic_sections. */
8186 if (elf_hash_table (info)->stab_info.stabstr == o)
8188 if (elf_hash_table (info)->eh_info.hdr_sec == o)
8190 if ((elf_section_data (o->output_section)->this_hdr.sh_type
8192 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
8194 if (! bfd_set_section_contents (abfd, o->output_section,
8196 (file_ptr) o->output_offset,
8202 /* The contents of the .dynstr section are actually in a
8204 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
8205 if (bfd_seek (abfd, off, SEEK_SET) != 0
8206 || ! _bfd_elf_strtab_emit (abfd,
8207 elf_hash_table (info)->dynstr))
8213 if (info->relocatable)
8215 bfd_boolean failed = FALSE;
8217 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
8222 /* If we have optimized stabs strings, output them. */
8223 if (elf_hash_table (info)->stab_info.stabstr != NULL)
8225 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
8229 if (info->eh_frame_hdr)
8231 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
8235 if (finfo.symstrtab != NULL)
8236 _bfd_stringtab_free (finfo.symstrtab);
8237 if (finfo.contents != NULL)
8238 free (finfo.contents);
8239 if (finfo.external_relocs != NULL)
8240 free (finfo.external_relocs);
8241 if (finfo.internal_relocs != NULL)
8242 free (finfo.internal_relocs);
8243 if (finfo.external_syms != NULL)
8244 free (finfo.external_syms);
8245 if (finfo.locsym_shndx != NULL)
8246 free (finfo.locsym_shndx);
8247 if (finfo.internal_syms != NULL)
8248 free (finfo.internal_syms);
8249 if (finfo.indices != NULL)
8250 free (finfo.indices);
8251 if (finfo.sections != NULL)
8252 free (finfo.sections);
8253 if (finfo.symbuf != NULL)
8254 free (finfo.symbuf);
8255 if (finfo.symshndxbuf != NULL)
8256 free (finfo.symshndxbuf);
8257 for (o = abfd->sections; o != NULL; o = o->next)
8259 if ((o->flags & SEC_RELOC) != 0
8260 && elf_section_data (o)->rel_hashes != NULL)
8261 free (elf_section_data (o)->rel_hashes);
8264 elf_tdata (abfd)->linker = TRUE;
8269 if (finfo.symstrtab != NULL)
8270 _bfd_stringtab_free (finfo.symstrtab);
8271 if (finfo.contents != NULL)
8272 free (finfo.contents);
8273 if (finfo.external_relocs != NULL)
8274 free (finfo.external_relocs);
8275 if (finfo.internal_relocs != NULL)
8276 free (finfo.internal_relocs);
8277 if (finfo.external_syms != NULL)
8278 free (finfo.external_syms);
8279 if (finfo.locsym_shndx != NULL)
8280 free (finfo.locsym_shndx);
8281 if (finfo.internal_syms != NULL)
8282 free (finfo.internal_syms);
8283 if (finfo.indices != NULL)
8284 free (finfo.indices);
8285 if (finfo.sections != NULL)
8286 free (finfo.sections);
8287 if (finfo.symbuf != NULL)
8288 free (finfo.symbuf);
8289 if (finfo.symshndxbuf != NULL)
8290 free (finfo.symshndxbuf);
8291 for (o = abfd->sections; o != NULL; o = o->next)
8293 if ((o->flags & SEC_RELOC) != 0
8294 && elf_section_data (o)->rel_hashes != NULL)
8295 free (elf_section_data (o)->rel_hashes);
8301 /* Garbage collect unused sections. */
8303 /* The mark phase of garbage collection. For a given section, mark
8304 it and any sections in this section's group, and all the sections
8305 which define symbols to which it refers. */
8307 typedef asection * (*gc_mark_hook_fn)
8308 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
8309 struct elf_link_hash_entry *, Elf_Internal_Sym *);
8312 elf_gc_mark (struct bfd_link_info *info,
8314 gc_mark_hook_fn gc_mark_hook)
8317 asection *group_sec;
8321 /* Mark all the sections in the group. */
8322 group_sec = elf_section_data (sec)->next_in_group;
8323 if (group_sec && !group_sec->gc_mark)
8324 if (!elf_gc_mark (info, group_sec, gc_mark_hook))
8327 /* Look through the section relocs. */
8329 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
8331 Elf_Internal_Rela *relstart, *rel, *relend;
8332 Elf_Internal_Shdr *symtab_hdr;
8333 struct elf_link_hash_entry **sym_hashes;
8336 bfd *input_bfd = sec->owner;
8337 const struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
8338 Elf_Internal_Sym *isym = NULL;
8341 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
8342 sym_hashes = elf_sym_hashes (input_bfd);
8344 /* Read the local symbols. */
8345 if (elf_bad_symtab (input_bfd))
8347 nlocsyms = symtab_hdr->sh_size / bed->s->sizeof_sym;
8351 extsymoff = nlocsyms = symtab_hdr->sh_info;
8353 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
8354 if (isym == NULL && nlocsyms != 0)
8356 isym = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, nlocsyms, 0,
8362 /* Read the relocations. */
8363 relstart = _bfd_elf_link_read_relocs (input_bfd, sec, NULL, NULL,
8365 if (relstart == NULL)
8370 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
8372 if (bed->s->arch_size == 32)
8377 for (rel = relstart; rel < relend; rel++)
8379 unsigned long r_symndx;
8381 struct elf_link_hash_entry *h;
8383 r_symndx = rel->r_info >> r_sym_shift;
8387 if (r_symndx >= nlocsyms
8388 || ELF_ST_BIND (isym[r_symndx].st_info) != STB_LOCAL)
8390 h = sym_hashes[r_symndx - extsymoff];
8391 while (h->root.type == bfd_link_hash_indirect
8392 || h->root.type == bfd_link_hash_warning)
8393 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8394 rsec = (*gc_mark_hook) (sec, info, rel, h, NULL);
8398 rsec = (*gc_mark_hook) (sec, info, rel, NULL, &isym[r_symndx]);
8401 if (rsec && !rsec->gc_mark)
8403 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
8405 else if (!elf_gc_mark (info, rsec, gc_mark_hook))
8414 if (elf_section_data (sec)->relocs != relstart)
8417 if (isym != NULL && symtab_hdr->contents != (unsigned char *) isym)
8419 if (! info->keep_memory)
8422 symtab_hdr->contents = (unsigned char *) isym;
8429 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
8432 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *idxptr)
8436 if (h->root.type == bfd_link_hash_warning)
8437 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8439 if (h->dynindx != -1
8440 && ((h->root.type != bfd_link_hash_defined
8441 && h->root.type != bfd_link_hash_defweak)
8442 || h->root.u.def.section->gc_mark))
8443 h->dynindx = (*idx)++;
8448 /* The sweep phase of garbage collection. Remove all garbage sections. */
8450 typedef bfd_boolean (*gc_sweep_hook_fn)
8451 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
8454 elf_gc_sweep (struct bfd_link_info *info, gc_sweep_hook_fn gc_sweep_hook)
8458 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
8462 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
8465 for (o = sub->sections; o != NULL; o = o->next)
8467 /* Keep special sections. Keep .debug sections. */
8468 if ((o->flags & SEC_LINKER_CREATED)
8469 || (o->flags & SEC_DEBUGGING))
8475 /* Skip sweeping sections already excluded. */
8476 if (o->flags & SEC_EXCLUDE)
8479 /* Since this is early in the link process, it is simple
8480 to remove a section from the output. */
8481 o->flags |= SEC_EXCLUDE;
8483 /* But we also have to update some of the relocation
8484 info we collected before. */
8486 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
8488 Elf_Internal_Rela *internal_relocs;
8492 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
8494 if (internal_relocs == NULL)
8497 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
8499 if (elf_section_data (o)->relocs != internal_relocs)
8500 free (internal_relocs);
8508 /* Remove the symbols that were in the swept sections from the dynamic
8509 symbol table. GCFIXME: Anyone know how to get them out of the
8510 static symbol table as well? */
8514 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol, &i);
8516 elf_hash_table (info)->dynsymcount = i;
8522 /* Propagate collected vtable information. This is called through
8523 elf_link_hash_traverse. */
8526 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
8528 if (h->root.type == bfd_link_hash_warning)
8529 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8531 /* Those that are not vtables. */
8532 if (h->vtable_parent == NULL)
8535 /* Those vtables that do not have parents, we cannot merge. */
8536 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
8539 /* If we've already been done, exit. */
8540 if (h->vtable_entries_used && h->vtable_entries_used[-1])
8543 /* Make sure the parent's table is up to date. */
8544 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
8546 if (h->vtable_entries_used == NULL)
8548 /* None of this table's entries were referenced. Re-use the
8550 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
8551 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
8556 bfd_boolean *cu, *pu;
8558 /* Or the parent's entries into ours. */
8559 cu = h->vtable_entries_used;
8561 pu = h->vtable_parent->vtable_entries_used;
8564 const struct elf_backend_data *bed;
8565 unsigned int log_file_align;
8567 bed = get_elf_backend_data (h->root.u.def.section->owner);
8568 log_file_align = bed->s->log_file_align;
8569 n = h->vtable_parent->vtable_entries_size >> log_file_align;
8584 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
8587 bfd_vma hstart, hend;
8588 Elf_Internal_Rela *relstart, *relend, *rel;
8589 const struct elf_backend_data *bed;
8590 unsigned int log_file_align;
8592 if (h->root.type == bfd_link_hash_warning)
8593 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8595 /* Take care of both those symbols that do not describe vtables as
8596 well as those that are not loaded. */
8597 if (h->vtable_parent == NULL)
8600 BFD_ASSERT (h->root.type == bfd_link_hash_defined
8601 || h->root.type == bfd_link_hash_defweak);
8603 sec = h->root.u.def.section;
8604 hstart = h->root.u.def.value;
8605 hend = hstart + h->size;
8607 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
8609 return *(bfd_boolean *) okp = FALSE;
8610 bed = get_elf_backend_data (sec->owner);
8611 log_file_align = bed->s->log_file_align;
8613 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
8615 for (rel = relstart; rel < relend; ++rel)
8616 if (rel->r_offset >= hstart && rel->r_offset < hend)
8618 /* If the entry is in use, do nothing. */
8619 if (h->vtable_entries_used
8620 && (rel->r_offset - hstart) < h->vtable_entries_size)
8622 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
8623 if (h->vtable_entries_used[entry])
8626 /* Otherwise, kill it. */
8627 rel->r_offset = rel->r_info = rel->r_addend = 0;
8633 /* Mark sections containing dynamically referenced symbols. This is called
8634 through elf_link_hash_traverse. */
8637 elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h,
8638 void *okp ATTRIBUTE_UNUSED)
8640 if (h->root.type == bfd_link_hash_warning)
8641 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8643 if ((h->root.type == bfd_link_hash_defined
8644 || h->root.type == bfd_link_hash_defweak)
8645 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC))
8646 h->root.u.def.section->flags |= SEC_KEEP;
8651 /* Do mark and sweep of unused sections. */
8654 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
8656 bfd_boolean ok = TRUE;
8658 asection * (*gc_mark_hook)
8659 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
8660 struct elf_link_hash_entry *h, Elf_Internal_Sym *);
8662 if (!get_elf_backend_data (abfd)->can_gc_sections
8663 || info->relocatable
8664 || info->emitrelocations
8666 || !is_elf_hash_table (info->hash))
8668 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
8672 /* Apply transitive closure to the vtable entry usage info. */
8673 elf_link_hash_traverse (elf_hash_table (info),
8674 elf_gc_propagate_vtable_entries_used,
8679 /* Kill the vtable relocations that were not used. */
8680 elf_link_hash_traverse (elf_hash_table (info),
8681 elf_gc_smash_unused_vtentry_relocs,
8686 /* Mark dynamically referenced symbols. */
8687 if (elf_hash_table (info)->dynamic_sections_created)
8688 elf_link_hash_traverse (elf_hash_table (info),
8689 elf_gc_mark_dynamic_ref_symbol,
8694 /* Grovel through relocs to find out who stays ... */
8695 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
8696 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
8700 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
8703 for (o = sub->sections; o != NULL; o = o->next)
8705 if (o->flags & SEC_KEEP)
8707 /* _bfd_elf_discard_section_eh_frame knows how to discard
8708 orphaned FDEs so don't mark sections referenced by the
8709 EH frame section. */
8710 if (strcmp (o->name, ".eh_frame") == 0)
8712 else if (!elf_gc_mark (info, o, gc_mark_hook))
8718 /* ... and mark SEC_EXCLUDE for those that go. */
8719 if (!elf_gc_sweep (info, get_elf_backend_data (abfd)->gc_sweep_hook))
8725 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
8728 bfd_elf_gc_record_vtinherit (bfd *abfd,
8730 struct elf_link_hash_entry *h,
8733 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
8734 struct elf_link_hash_entry **search, *child;
8735 bfd_size_type extsymcount;
8736 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8739 /* The sh_info field of the symtab header tells us where the
8740 external symbols start. We don't care about the local symbols at
8742 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
8743 if (!elf_bad_symtab (abfd))
8744 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
8746 sym_hashes = elf_sym_hashes (abfd);
8747 sym_hashes_end = sym_hashes + extsymcount;
8749 /* Hunt down the child symbol, which is in this section at the same
8750 offset as the relocation. */
8751 for (search = sym_hashes; search != sym_hashes_end; ++search)
8753 if ((child = *search) != NULL
8754 && (child->root.type == bfd_link_hash_defined
8755 || child->root.type == bfd_link_hash_defweak)
8756 && child->root.u.def.section == sec
8757 && child->root.u.def.value == offset)
8761 sec_name = bfd_get_section_ident (sec);
8762 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
8763 bfd_archive_filename (abfd),
8764 sec_name ? sec_name : sec->name,
8765 (unsigned long) offset);
8766 bfd_set_error (bfd_error_invalid_operation);
8772 /* This *should* only be the absolute section. It could potentially
8773 be that someone has defined a non-global vtable though, which
8774 would be bad. It isn't worth paging in the local symbols to be
8775 sure though; that case should simply be handled by the assembler. */
8777 child->vtable_parent = (struct elf_link_hash_entry *) -1;
8780 child->vtable_parent = h;
8785 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
8788 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
8789 asection *sec ATTRIBUTE_UNUSED,
8790 struct elf_link_hash_entry *h,
8793 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8794 unsigned int log_file_align = bed->s->log_file_align;
8796 if (addend >= h->vtable_entries_size)
8798 size_t size, bytes, file_align;
8799 bfd_boolean *ptr = h->vtable_entries_used;
8801 /* While the symbol is undefined, we have to be prepared to handle
8803 file_align = 1 << log_file_align;
8804 if (h->root.type == bfd_link_hash_undefined)
8805 size = addend + file_align;
8811 /* Oops! We've got a reference past the defined end of
8812 the table. This is probably a bug -- shall we warn? */
8813 size = addend + file_align;
8816 size = (size + file_align - 1) & -file_align;
8818 /* Allocate one extra entry for use as a "done" flag for the
8819 consolidation pass. */
8820 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
8824 ptr = bfd_realloc (ptr - 1, bytes);
8830 oldbytes = (((h->vtable_entries_size >> log_file_align) + 1)
8831 * sizeof (bfd_boolean));
8832 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
8836 ptr = bfd_zmalloc (bytes);
8841 /* And arrange for that done flag to be at index -1. */
8842 h->vtable_entries_used = ptr + 1;
8843 h->vtable_entries_size = size;
8846 h->vtable_entries_used[addend >> log_file_align] = TRUE;
8851 struct alloc_got_off_arg {
8853 unsigned int got_elt_size;
8856 /* We need a special top-level link routine to convert got reference counts
8857 to real got offsets. */
8860 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
8862 struct alloc_got_off_arg *gofarg = arg;
8864 if (h->root.type == bfd_link_hash_warning)
8865 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8867 if (h->got.refcount > 0)
8869 h->got.offset = gofarg->gotoff;
8870 gofarg->gotoff += gofarg->got_elt_size;
8873 h->got.offset = (bfd_vma) -1;
8878 /* And an accompanying bit to work out final got entry offsets once
8879 we're done. Should be called from final_link. */
8882 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
8883 struct bfd_link_info *info)
8886 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8888 unsigned int got_elt_size = bed->s->arch_size / 8;
8889 struct alloc_got_off_arg gofarg;
8891 if (! is_elf_hash_table (info->hash))
8894 /* The GOT offset is relative to the .got section, but the GOT header is
8895 put into the .got.plt section, if the backend uses it. */
8896 if (bed->want_got_plt)
8899 gotoff = bed->got_header_size;
8901 /* Do the local .got entries first. */
8902 for (i = info->input_bfds; i; i = i->link_next)
8904 bfd_signed_vma *local_got;
8905 bfd_size_type j, locsymcount;
8906 Elf_Internal_Shdr *symtab_hdr;
8908 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
8911 local_got = elf_local_got_refcounts (i);
8915 symtab_hdr = &elf_tdata (i)->symtab_hdr;
8916 if (elf_bad_symtab (i))
8917 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
8919 locsymcount = symtab_hdr->sh_info;
8921 for (j = 0; j < locsymcount; ++j)
8923 if (local_got[j] > 0)
8925 local_got[j] = gotoff;
8926 gotoff += got_elt_size;
8929 local_got[j] = (bfd_vma) -1;
8933 /* Then the global .got entries. .plt refcounts are handled by
8934 adjust_dynamic_symbol */
8935 gofarg.gotoff = gotoff;
8936 gofarg.got_elt_size = got_elt_size;
8937 elf_link_hash_traverse (elf_hash_table (info),
8938 elf_gc_allocate_got_offsets,
8943 /* Many folk need no more in the way of final link than this, once
8944 got entry reference counting is enabled. */
8947 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
8949 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
8952 /* Invoke the regular ELF backend linker to do all the work. */
8953 return bfd_elf_final_link (abfd, info);
8957 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
8959 struct elf_reloc_cookie *rcookie = cookie;
8961 if (rcookie->bad_symtab)
8962 rcookie->rel = rcookie->rels;
8964 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
8966 unsigned long r_symndx;
8968 if (! rcookie->bad_symtab)
8969 if (rcookie->rel->r_offset > offset)
8971 if (rcookie->rel->r_offset != offset)
8974 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
8975 if (r_symndx == SHN_UNDEF)
8978 if (r_symndx >= rcookie->locsymcount
8979 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
8981 struct elf_link_hash_entry *h;
8983 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
8985 while (h->root.type == bfd_link_hash_indirect
8986 || h->root.type == bfd_link_hash_warning)
8987 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8989 if ((h->root.type == bfd_link_hash_defined
8990 || h->root.type == bfd_link_hash_defweak)
8991 && elf_discarded_section (h->root.u.def.section))
8998 /* It's not a relocation against a global symbol,
8999 but it could be a relocation against a local
9000 symbol for a discarded section. */
9002 Elf_Internal_Sym *isym;
9004 /* Need to: get the symbol; get the section. */
9005 isym = &rcookie->locsyms[r_symndx];
9006 if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
9008 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
9009 if (isec != NULL && elf_discarded_section (isec))
9018 /* Discard unneeded references to discarded sections.
9019 Returns TRUE if any section's size was changed. */
9020 /* This function assumes that the relocations are in sorted order,
9021 which is true for all known assemblers. */
9024 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
9026 struct elf_reloc_cookie cookie;
9027 asection *stab, *eh;
9028 Elf_Internal_Shdr *symtab_hdr;
9029 const struct elf_backend_data *bed;
9032 bfd_boolean ret = FALSE;
9034 if (info->traditional_format
9035 || !is_elf_hash_table (info->hash))
9038 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
9040 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
9043 bed = get_elf_backend_data (abfd);
9045 if ((abfd->flags & DYNAMIC) != 0)
9048 eh = bfd_get_section_by_name (abfd, ".eh_frame");
9049 if (info->relocatable
9052 || bfd_is_abs_section (eh->output_section))))
9055 stab = bfd_get_section_by_name (abfd, ".stab");
9058 || bfd_is_abs_section (stab->output_section)
9059 || stab->sec_info_type != ELF_INFO_TYPE_STABS))
9064 && bed->elf_backend_discard_info == NULL)
9067 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9069 cookie.sym_hashes = elf_sym_hashes (abfd);
9070 cookie.bad_symtab = elf_bad_symtab (abfd);
9071 if (cookie.bad_symtab)
9073 cookie.locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9074 cookie.extsymoff = 0;
9078 cookie.locsymcount = symtab_hdr->sh_info;
9079 cookie.extsymoff = symtab_hdr->sh_info;
9082 if (bed->s->arch_size == 32)
9083 cookie.r_sym_shift = 8;
9085 cookie.r_sym_shift = 32;
9087 cookie.locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
9088 if (cookie.locsyms == NULL && cookie.locsymcount != 0)
9090 cookie.locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
9091 cookie.locsymcount, 0,
9093 if (cookie.locsyms == NULL)
9100 count = stab->reloc_count;
9102 cookie.rels = _bfd_elf_link_read_relocs (abfd, stab, NULL, NULL,
9104 if (cookie.rels != NULL)
9106 cookie.rel = cookie.rels;
9107 cookie.relend = cookie.rels;
9108 cookie.relend += count * bed->s->int_rels_per_ext_rel;
9109 if (_bfd_discard_section_stabs (abfd, stab,
9110 elf_section_data (stab)->sec_info,
9111 bfd_elf_reloc_symbol_deleted_p,
9114 if (elf_section_data (stab)->relocs != cookie.rels)
9122 count = eh->reloc_count;
9124 cookie.rels = _bfd_elf_link_read_relocs (abfd, eh, NULL, NULL,
9126 cookie.rel = cookie.rels;
9127 cookie.relend = cookie.rels;
9128 if (cookie.rels != NULL)
9129 cookie.relend += count * bed->s->int_rels_per_ext_rel;
9131 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
9132 bfd_elf_reloc_symbol_deleted_p,
9136 if (cookie.rels != NULL
9137 && elf_section_data (eh)->relocs != cookie.rels)
9141 if (bed->elf_backend_discard_info != NULL
9142 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
9145 if (cookie.locsyms != NULL
9146 && symtab_hdr->contents != (unsigned char *) cookie.locsyms)
9148 if (! info->keep_memory)
9149 free (cookie.locsyms);
9151 symtab_hdr->contents = (unsigned char *) cookie.locsyms;
9155 if (info->eh_frame_hdr
9156 && !info->relocatable
9157 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
9164 _bfd_elf_section_already_linked (bfd *abfd, struct bfd_section * sec)
9168 struct bfd_section_already_linked *l;
9169 struct bfd_section_already_linked_hash_entry *already_linked_list;
9172 if ((flags & SEC_LINK_ONCE) == 0)
9175 /* FIXME: When doing a relocatable link, we may have trouble
9176 copying relocations in other sections that refer to local symbols
9177 in the section being discarded. Those relocations will have to
9178 be converted somehow; as of this writing I'm not sure that any of
9179 the backends handle that correctly.
9181 It is tempting to instead not discard link once sections when
9182 doing a relocatable link (technically, they should be discarded
9183 whenever we are building constructors). However, that fails,
9184 because the linker winds up combining all the link once sections
9185 into a single large link once section, which defeats the purpose
9186 of having link once sections in the first place.
9188 Also, not merging link once sections in a relocatable link
9189 causes trouble for MIPS ELF, which relies on link once semantics
9190 to handle the .reginfo section correctly. */
9192 name = bfd_get_section_name (abfd, sec);
9194 already_linked_list = bfd_section_already_linked_table_lookup (name);
9196 for (l = already_linked_list->entry; l != NULL; l = l->next)
9198 /* We may have 3 different sections on the list: group section,
9199 comdat section and linkonce section. SEC may be a linkonce or
9200 group section. We match a group section with a group section,
9201 a linkonce section with a linkonce section, and ignore comdat
9203 if ((sec->flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
9204 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL)
9206 /* The section has already been linked. See if we should
9208 switch (flags & SEC_LINK_DUPLICATES)
9213 case SEC_LINK_DUPLICATES_DISCARD:
9216 case SEC_LINK_DUPLICATES_ONE_ONLY:
9217 (*_bfd_error_handler)
9218 (_("%s: %s: warning: ignoring duplicate section `%s'\n"),
9219 bfd_archive_filename (abfd), name);
9222 case SEC_LINK_DUPLICATES_SAME_SIZE:
9223 if (sec->size != l->sec->size)
9224 (*_bfd_error_handler)
9225 (_("%s: %s: warning: duplicate section `%s' has different size\n"),
9226 bfd_archive_filename (abfd), name);
9230 /* Set the output_section field so that lang_add_section
9231 does not create a lang_input_section structure for this
9232 section. Since there might be a symbol in the section
9233 being discarded, we must retain a pointer to the section
9234 which we are really going to use. */
9235 sec->output_section = bfd_abs_section_ptr;
9236 sec->kept_section = l->sec;
9238 if (flags & SEC_GROUP)
9239 bfd_elf_discard_group (abfd, sec);
9245 /* This is the first section with this name. Record it. */
9246 bfd_section_already_linked_table_insert (already_linked_list, sec);