2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001
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. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info *info;
30 struct bfd_elf_version_tree *verdefs;
33 static boolean elf_link_add_object_symbols
34 PARAMS ((bfd *, struct bfd_link_info *));
35 static boolean elf_link_add_archive_symbols
36 PARAMS ((bfd *, struct bfd_link_info *));
37 static boolean elf_merge_symbol
38 PARAMS ((bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
39 asection **, bfd_vma *, struct elf_link_hash_entry **,
40 boolean *, boolean *, boolean *, boolean));
41 static boolean elf_export_symbol
42 PARAMS ((struct elf_link_hash_entry *, PTR));
43 static boolean elf_fix_symbol_flags
44 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
45 static boolean elf_adjust_dynamic_symbol
46 PARAMS ((struct elf_link_hash_entry *, PTR));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry *, PTR));
49 static boolean elf_link_find_version_dependencies
50 PARAMS ((struct elf_link_hash_entry *, PTR));
51 static boolean elf_link_assign_sym_version
52 PARAMS ((struct elf_link_hash_entry *, PTR));
53 static boolean elf_collect_hash_codes
54 PARAMS ((struct elf_link_hash_entry *, PTR));
55 static boolean elf_link_read_relocs_from_section
56 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
57 static void elf_link_output_relocs
58 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
59 static boolean elf_link_size_reloc_section
60 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
61 static void elf_link_adjust_relocs
62 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
63 struct elf_link_hash_entry **));
65 /* Given an ELF BFD, add symbols to the global hash table as
69 elf_bfd_link_add_symbols (abfd, info)
71 struct bfd_link_info *info;
73 switch (bfd_get_format (abfd))
76 return elf_link_add_object_symbols (abfd, info);
78 return elf_link_add_archive_symbols (abfd, info);
80 bfd_set_error (bfd_error_wrong_format);
85 /* Return true iff this is a non-common, definition of a non-function symbol. */
87 is_global_data_symbol_definition (abfd, sym)
88 bfd * abfd ATTRIBUTE_UNUSED;
89 Elf_Internal_Sym * sym;
91 /* Local symbols do not count, but target specific ones might. */
92 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
93 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
96 /* Function symbols do not count. */
97 if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
100 /* If the section is undefined, then so is the symbol. */
101 if (sym->st_shndx == SHN_UNDEF)
104 /* If the symbol is defined in the common section, then
105 it is a common definition and so does not count. */
106 if (sym->st_shndx == SHN_COMMON)
109 /* If the symbol is in a target specific section then we
110 must rely upon the backend to tell us what it is. */
111 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
112 /* FIXME - this function is not coded yet:
114 return _bfd_is_global_symbol_definition (abfd, sym);
116 Instead for now assume that the definition is not global,
117 Even if this is wrong, at least the linker will behave
118 in the same way that it used to do. */
124 /* Search the symbol table of the archive element of the archive ABFD
125 whose archive map contains a mention of SYMDEF, and determine if
126 the symbol is defined in this element. */
128 elf_link_is_defined_archive_symbol (abfd, symdef)
132 Elf_Internal_Shdr * hdr;
133 Elf_External_Sym * esym;
134 Elf_External_Sym * esymend;
135 Elf_External_Sym * buf = NULL;
139 boolean result = false;
141 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
142 if (abfd == (bfd *) NULL)
145 if (! bfd_check_format (abfd, bfd_object))
148 /* If we have already included the element containing this symbol in the
149 link then we do not need to include it again. Just claim that any symbol
150 it contains is not a definition, so that our caller will not decide to
151 (re)include this element. */
152 if (abfd->archive_pass)
155 /* Select the appropriate symbol table. */
156 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
157 hdr = &elf_tdata (abfd)->symtab_hdr;
159 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
161 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
163 /* The sh_info field of the symtab header tells us where the
164 external symbols start. We don't care about the local symbols. */
165 if (elf_bad_symtab (abfd))
167 extsymcount = symcount;
172 extsymcount = symcount - hdr->sh_info;
173 extsymoff = hdr->sh_info;
176 buf = ((Elf_External_Sym *)
177 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
178 if (buf == NULL && extsymcount != 0)
181 /* Read in the symbol table.
182 FIXME: This ought to be cached somewhere. */
184 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
186 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
187 != extsymcount * sizeof (Elf_External_Sym)))
193 /* Scan the symbol table looking for SYMDEF. */
194 esymend = buf + extsymcount;
199 Elf_Internal_Sym sym;
202 elf_swap_symbol_in (abfd, esym, & sym);
204 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
205 if (name == (const char *) NULL)
208 if (strcmp (name, symdef->name) == 0)
210 result = is_global_data_symbol_definition (abfd, & sym);
220 /* Add symbols from an ELF archive file to the linker hash table. We
221 don't use _bfd_generic_link_add_archive_symbols because of a
222 problem which arises on UnixWare. The UnixWare libc.so is an
223 archive which includes an entry libc.so.1 which defines a bunch of
224 symbols. The libc.so archive also includes a number of other
225 object files, which also define symbols, some of which are the same
226 as those defined in libc.so.1. Correct linking requires that we
227 consider each object file in turn, and include it if it defines any
228 symbols we need. _bfd_generic_link_add_archive_symbols does not do
229 this; it looks through the list of undefined symbols, and includes
230 any object file which defines them. When this algorithm is used on
231 UnixWare, it winds up pulling in libc.so.1 early and defining a
232 bunch of symbols. This means that some of the other objects in the
233 archive are not included in the link, which is incorrect since they
234 precede libc.so.1 in the archive.
236 Fortunately, ELF archive handling is simpler than that done by
237 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
238 oddities. In ELF, if we find a symbol in the archive map, and the
239 symbol is currently undefined, we know that we must pull in that
242 Unfortunately, we do have to make multiple passes over the symbol
243 table until nothing further is resolved. */
246 elf_link_add_archive_symbols (abfd, info)
248 struct bfd_link_info *info;
251 boolean *defined = NULL;
252 boolean *included = NULL;
256 if (! bfd_has_map (abfd))
258 /* An empty archive is a special case. */
259 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
261 bfd_set_error (bfd_error_no_armap);
265 /* Keep track of all symbols we know to be already defined, and all
266 files we know to be already included. This is to speed up the
267 second and subsequent passes. */
268 c = bfd_ardata (abfd)->symdef_count;
271 defined = (boolean *) bfd_malloc (c * sizeof (boolean));
272 included = (boolean *) bfd_malloc (c * sizeof (boolean));
273 if (defined == (boolean *) NULL || included == (boolean *) NULL)
275 memset (defined, 0, c * sizeof (boolean));
276 memset (included, 0, c * sizeof (boolean));
278 symdefs = bfd_ardata (abfd)->symdefs;
291 symdefend = symdef + c;
292 for (i = 0; symdef < symdefend; symdef++, i++)
294 struct elf_link_hash_entry *h;
296 struct bfd_link_hash_entry *undefs_tail;
299 if (defined[i] || included[i])
301 if (symdef->file_offset == last)
307 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
308 false, false, false);
314 /* If this is a default version (the name contains @@),
315 look up the symbol again without the version. The
316 effect is that references to the symbol without the
317 version will be matched by the default symbol in the
320 p = strchr (symdef->name, ELF_VER_CHR);
321 if (p == NULL || p[1] != ELF_VER_CHR)
324 copy = bfd_alloc (abfd, p - symdef->name + 1);
327 memcpy (copy, symdef->name, p - symdef->name);
328 copy[p - symdef->name] = '\0';
330 h = elf_link_hash_lookup (elf_hash_table (info), copy,
331 false, false, false);
333 bfd_release (abfd, copy);
339 if (h->root.type == bfd_link_hash_common)
341 /* We currently have a common symbol. The archive map contains
342 a reference to this symbol, so we may want to include it. We
343 only want to include it however, if this archive element
344 contains a definition of the symbol, not just another common
347 Unfortunately some archivers (including GNU ar) will put
348 declarations of common symbols into their archive maps, as
349 well as real definitions, so we cannot just go by the archive
350 map alone. Instead we must read in the element's symbol
351 table and check that to see what kind of symbol definition
353 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
356 else if (h->root.type != bfd_link_hash_undefined)
358 if (h->root.type != bfd_link_hash_undefweak)
363 /* We need to include this archive member. */
364 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
365 if (element == (bfd *) NULL)
368 if (! bfd_check_format (element, bfd_object))
371 /* Doublecheck that we have not included this object
372 already--it should be impossible, but there may be
373 something wrong with the archive. */
374 if (element->archive_pass != 0)
376 bfd_set_error (bfd_error_bad_value);
379 element->archive_pass = 1;
381 undefs_tail = info->hash->undefs_tail;
383 if (! (*info->callbacks->add_archive_element) (info, element,
386 if (! elf_link_add_object_symbols (element, info))
389 /* If there are any new undefined symbols, we need to make
390 another pass through the archive in order to see whether
391 they can be defined. FIXME: This isn't perfect, because
392 common symbols wind up on undefs_tail and because an
393 undefined symbol which is defined later on in this pass
394 does not require another pass. This isn't a bug, but it
395 does make the code less efficient than it could be. */
396 if (undefs_tail != info->hash->undefs_tail)
399 /* Look backward to mark all symbols from this object file
400 which we have already seen in this pass. */
404 included[mark] = true;
409 while (symdefs[mark].file_offset == symdef->file_offset);
411 /* We mark subsequent symbols from this object file as we go
412 on through the loop. */
413 last = symdef->file_offset;
424 if (defined != (boolean *) NULL)
426 if (included != (boolean *) NULL)
431 /* This function is called when we want to define a new symbol. It
432 handles the various cases which arise when we find a definition in
433 a dynamic object, or when there is already a definition in a
434 dynamic object. The new symbol is described by NAME, SYM, PSEC,
435 and PVALUE. We set SYM_HASH to the hash table entry. We set
436 OVERRIDE if the old symbol is overriding a new definition. We set
437 TYPE_CHANGE_OK if it is OK for the type to change. We set
438 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
439 change, we mean that we shouldn't warn if the type or size does
440 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
444 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
445 override, type_change_ok, size_change_ok, dt_needed)
447 struct bfd_link_info *info;
449 Elf_Internal_Sym *sym;
452 struct elf_link_hash_entry **sym_hash;
454 boolean *type_change_ok;
455 boolean *size_change_ok;
459 struct elf_link_hash_entry *h;
462 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
467 bind = ELF_ST_BIND (sym->st_info);
469 if (! bfd_is_und_section (sec))
470 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
472 h = ((struct elf_link_hash_entry *)
473 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
478 /* This code is for coping with dynamic objects, and is only useful
479 if we are doing an ELF link. */
480 if (info->hash->creator != abfd->xvec)
483 /* For merging, we only care about real symbols. */
485 while (h->root.type == bfd_link_hash_indirect
486 || h->root.type == bfd_link_hash_warning)
487 h = (struct elf_link_hash_entry *) h->root.u.i.link;
489 /* If we just created the symbol, mark it as being an ELF symbol.
490 Other than that, there is nothing to do--there is no merge issue
491 with a newly defined symbol--so we just return. */
493 if (h->root.type == bfd_link_hash_new)
495 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
499 /* OLDBFD is a BFD associated with the existing symbol. */
501 switch (h->root.type)
507 case bfd_link_hash_undefined:
508 case bfd_link_hash_undefweak:
509 oldbfd = h->root.u.undef.abfd;
512 case bfd_link_hash_defined:
513 case bfd_link_hash_defweak:
514 oldbfd = h->root.u.def.section->owner;
517 case bfd_link_hash_common:
518 oldbfd = h->root.u.c.p->section->owner;
522 /* In cases involving weak versioned symbols, we may wind up trying
523 to merge a symbol with itself. Catch that here, to avoid the
524 confusion that results if we try to override a symbol with
525 itself. The additional tests catch cases like
526 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
527 dynamic object, which we do want to handle here. */
529 && ((abfd->flags & DYNAMIC) == 0
530 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
533 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
534 respectively, is from a dynamic object. */
536 if ((abfd->flags & DYNAMIC) != 0)
542 olddyn = (oldbfd->flags & DYNAMIC) != 0;
547 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
548 indices used by MIPS ELF. */
549 switch (h->root.type)
555 case bfd_link_hash_defined:
556 case bfd_link_hash_defweak:
557 hsec = h->root.u.def.section;
560 case bfd_link_hash_common:
561 hsec = h->root.u.c.p->section;
568 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
571 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
572 respectively, appear to be a definition rather than reference. */
574 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
579 if (h->root.type == bfd_link_hash_undefined
580 || h->root.type == bfd_link_hash_undefweak
581 || h->root.type == bfd_link_hash_common)
586 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
587 symbol, respectively, appears to be a common symbol in a dynamic
588 object. If a symbol appears in an uninitialized section, and is
589 not weak, and is not a function, then it may be a common symbol
590 which was resolved when the dynamic object was created. We want
591 to treat such symbols specially, because they raise special
592 considerations when setting the symbol size: if the symbol
593 appears as a common symbol in a regular object, and the size in
594 the regular object is larger, we must make sure that we use the
595 larger size. This problematic case can always be avoided in C,
596 but it must be handled correctly when using Fortran shared
599 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
600 likewise for OLDDYNCOMMON and OLDDEF.
602 Note that this test is just a heuristic, and that it is quite
603 possible to have an uninitialized symbol in a shared object which
604 is really a definition, rather than a common symbol. This could
605 lead to some minor confusion when the symbol really is a common
606 symbol in some regular object. However, I think it will be
611 && (sec->flags & SEC_ALLOC) != 0
612 && (sec->flags & SEC_LOAD) == 0
615 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
618 newdyncommon = false;
622 && h->root.type == bfd_link_hash_defined
623 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
624 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
625 && (h->root.u.def.section->flags & SEC_LOAD) == 0
627 && h->type != STT_FUNC)
630 olddyncommon = false;
632 /* It's OK to change the type if either the existing symbol or the
633 new symbol is weak unless it comes from a DT_NEEDED entry of
634 a shared object, in which case, the DT_NEEDED entry may not be
635 required at the run time. */
637 if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
638 || h->root.type == bfd_link_hash_undefweak
640 *type_change_ok = true;
642 /* It's OK to change the size if either the existing symbol or the
643 new symbol is weak, or if the old symbol is undefined. */
646 || h->root.type == bfd_link_hash_undefined)
647 *size_change_ok = true;
649 /* If both the old and the new symbols look like common symbols in a
650 dynamic object, set the size of the symbol to the larger of the
655 && sym->st_size != h->size)
657 /* Since we think we have two common symbols, issue a multiple
658 common warning if desired. Note that we only warn if the
659 size is different. If the size is the same, we simply let
660 the old symbol override the new one as normally happens with
661 symbols defined in dynamic objects. */
663 if (! ((*info->callbacks->multiple_common)
664 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
665 h->size, abfd, bfd_link_hash_common, sym->st_size)))
668 if (sym->st_size > h->size)
669 h->size = sym->st_size;
671 *size_change_ok = true;
674 /* If we are looking at a dynamic object, and we have found a
675 definition, we need to see if the symbol was already defined by
676 some other object. If so, we want to use the existing
677 definition, and we do not want to report a multiple symbol
678 definition error; we do this by clobbering *PSEC to be
681 We treat a common symbol as a definition if the symbol in the
682 shared library is a function, since common symbols always
683 represent variables; this can cause confusion in principle, but
684 any such confusion would seem to indicate an erroneous program or
685 shared library. We also permit a common symbol in a regular
686 object to override a weak symbol in a shared object.
688 We prefer a non-weak definition in a shared library to a weak
689 definition in the executable unless it comes from a DT_NEEDED
690 entry of a shared object, in which case, the DT_NEEDED entry
691 may not be required at the run time. */
696 || (h->root.type == bfd_link_hash_common
698 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
699 && (h->root.type != bfd_link_hash_defweak
701 || bind == STB_WEAK))
705 newdyncommon = false;
707 *psec = sec = bfd_und_section_ptr;
708 *size_change_ok = true;
710 /* If we get here when the old symbol is a common symbol, then
711 we are explicitly letting it override a weak symbol or
712 function in a dynamic object, and we don't want to warn about
713 a type change. If the old symbol is a defined symbol, a type
714 change warning may still be appropriate. */
716 if (h->root.type == bfd_link_hash_common)
717 *type_change_ok = true;
720 /* Handle the special case of an old common symbol merging with a
721 new symbol which looks like a common symbol in a shared object.
722 We change *PSEC and *PVALUE to make the new symbol look like a
723 common symbol, and let _bfd_generic_link_add_one_symbol will do
727 && h->root.type == bfd_link_hash_common)
731 newdyncommon = false;
732 *pvalue = sym->st_size;
733 *psec = sec = bfd_com_section_ptr;
734 *size_change_ok = true;
737 /* If the old symbol is from a dynamic object, and the new symbol is
738 a definition which is not from a dynamic object, then the new
739 symbol overrides the old symbol. Symbols from regular files
740 always take precedence over symbols from dynamic objects, even if
741 they are defined after the dynamic object in the link.
743 As above, we again permit a common symbol in a regular object to
744 override a definition in a shared object if the shared object
745 symbol is a function or is weak.
747 As above, we permit a non-weak definition in a shared object to
748 override a weak definition in a regular object. */
752 || (bfd_is_com_section (sec)
753 && (h->root.type == bfd_link_hash_defweak
754 || h->type == STT_FUNC)))
757 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
759 || h->root.type == bfd_link_hash_defweak))
761 /* Change the hash table entry to undefined, and let
762 _bfd_generic_link_add_one_symbol do the right thing with the
765 h->root.type = bfd_link_hash_undefined;
766 h->root.u.undef.abfd = h->root.u.def.section->owner;
767 *size_change_ok = true;
770 olddyncommon = false;
772 /* We again permit a type change when a common symbol may be
773 overriding a function. */
775 if (bfd_is_com_section (sec))
776 *type_change_ok = true;
778 /* This union may have been set to be non-NULL when this symbol
779 was seen in a dynamic object. We must force the union to be
780 NULL, so that it is correct for a regular symbol. */
782 h->verinfo.vertree = NULL;
784 /* In this special case, if H is the target of an indirection,
785 we want the caller to frob with H rather than with the
786 indirect symbol. That will permit the caller to redefine the
787 target of the indirection, rather than the indirect symbol
788 itself. FIXME: This will break the -y option if we store a
789 symbol with a different name. */
793 /* Handle the special case of a new common symbol merging with an
794 old symbol that looks like it might be a common symbol defined in
795 a shared object. Note that we have already handled the case in
796 which a new common symbol should simply override the definition
797 in the shared library. */
800 && bfd_is_com_section (sec)
803 /* It would be best if we could set the hash table entry to a
804 common symbol, but we don't know what to use for the section
806 if (! ((*info->callbacks->multiple_common)
807 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
808 h->size, abfd, bfd_link_hash_common, sym->st_size)))
811 /* If the predumed common symbol in the dynamic object is
812 larger, pretend that the new symbol has its size. */
814 if (h->size > *pvalue)
817 /* FIXME: We no longer know the alignment required by the symbol
818 in the dynamic object, so we just wind up using the one from
819 the regular object. */
822 olddyncommon = false;
824 h->root.type = bfd_link_hash_undefined;
825 h->root.u.undef.abfd = h->root.u.def.section->owner;
827 *size_change_ok = true;
828 *type_change_ok = true;
830 h->verinfo.vertree = NULL;
833 /* Handle the special case of a weak definition in a regular object
834 followed by a non-weak definition in a shared object. In this
835 case, we prefer the definition in the shared object unless it
836 comes from a DT_NEEDED entry of a shared object, in which case,
837 the DT_NEEDED entry may not be required at the run time. */
840 && h->root.type == bfd_link_hash_defweak
845 /* To make this work we have to frob the flags so that the rest
846 of the code does not think we are using the regular
848 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
849 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
850 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
851 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
852 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
853 | ELF_LINK_HASH_DEF_DYNAMIC);
855 /* If H is the target of an indirection, we want the caller to
856 use H rather than the indirect symbol. Otherwise if we are
857 defining a new indirect symbol we will wind up attaching it
858 to the entry we are overriding. */
862 /* Handle the special case of a non-weak definition in a shared
863 object followed by a weak definition in a regular object. In
864 this case we prefer to definition in the shared object. To make
865 this work we have to tell the caller to not treat the new symbol
869 && h->root.type != bfd_link_hash_defweak
878 /* Add symbols from an ELF object file to the linker hash table. */
881 elf_link_add_object_symbols (abfd, info)
883 struct bfd_link_info *info;
885 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
886 const Elf_Internal_Sym *,
887 const char **, flagword *,
888 asection **, bfd_vma *));
889 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
890 asection *, const Elf_Internal_Rela *));
892 Elf_Internal_Shdr *hdr;
896 Elf_External_Sym *buf = NULL;
897 struct elf_link_hash_entry **sym_hash;
899 Elf_External_Versym *extversym = NULL;
900 Elf_External_Versym *ever;
901 Elf_External_Dyn *dynbuf = NULL;
902 struct elf_link_hash_entry *weaks;
903 Elf_External_Sym *esym;
904 Elf_External_Sym *esymend;
905 struct elf_backend_data *bed;
908 bed = get_elf_backend_data (abfd);
909 add_symbol_hook = bed->elf_add_symbol_hook;
910 collect = bed->collect;
912 if ((abfd->flags & DYNAMIC) == 0)
918 /* You can't use -r against a dynamic object. Also, there's no
919 hope of using a dynamic object which does not exactly match
920 the format of the output file. */
921 if (info->relocateable || info->hash->creator != abfd->xvec)
923 bfd_set_error (bfd_error_invalid_operation);
928 /* As a GNU extension, any input sections which are named
929 .gnu.warning.SYMBOL are treated as warning symbols for the given
930 symbol. This differs from .gnu.warning sections, which generate
931 warnings when they are included in an output file. */
936 for (s = abfd->sections; s != NULL; s = s->next)
940 name = bfd_get_section_name (abfd, s);
941 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
946 name += sizeof ".gnu.warning." - 1;
948 /* If this is a shared object, then look up the symbol
949 in the hash table. If it is there, and it is already
950 been defined, then we will not be using the entry
951 from this shared object, so we don't need to warn.
952 FIXME: If we see the definition in a regular object
953 later on, we will warn, but we shouldn't. The only
954 fix is to keep track of what warnings we are supposed
955 to emit, and then handle them all at the end of the
957 if (dynamic && abfd->xvec == info->hash->creator)
959 struct elf_link_hash_entry *h;
961 h = elf_link_hash_lookup (elf_hash_table (info), name,
964 /* FIXME: What about bfd_link_hash_common? */
966 && (h->root.type == bfd_link_hash_defined
967 || h->root.type == bfd_link_hash_defweak))
969 /* We don't want to issue this warning. Clobber
970 the section size so that the warning does not
971 get copied into the output file. */
977 sz = bfd_section_size (abfd, s);
978 msg = (char *) bfd_alloc (abfd, sz + 1);
982 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
987 if (! (_bfd_generic_link_add_one_symbol
988 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
989 false, collect, (struct bfd_link_hash_entry **) NULL)))
992 if (! info->relocateable)
994 /* Clobber the section size so that the warning does
995 not get copied into the output file. */
1002 /* If this is a dynamic object, we always link against the .dynsym
1003 symbol table, not the .symtab symbol table. The dynamic linker
1004 will only see the .dynsym symbol table, so there is no reason to
1005 look at .symtab for a dynamic object. */
1007 if (! dynamic || elf_dynsymtab (abfd) == 0)
1008 hdr = &elf_tdata (abfd)->symtab_hdr;
1010 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1014 /* Read in any version definitions. */
1016 if (! _bfd_elf_slurp_version_tables (abfd))
1019 /* Read in the symbol versions, but don't bother to convert them
1020 to internal format. */
1021 if (elf_dynversym (abfd) != 0)
1023 Elf_Internal_Shdr *versymhdr;
1025 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1026 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
1027 if (extversym == NULL)
1029 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1030 || (bfd_read ((PTR) extversym, 1, versymhdr->sh_size, abfd)
1031 != versymhdr->sh_size))
1036 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1038 /* The sh_info field of the symtab header tells us where the
1039 external symbols start. We don't care about the local symbols at
1041 if (elf_bad_symtab (abfd))
1043 extsymcount = symcount;
1048 extsymcount = symcount - hdr->sh_info;
1049 extsymoff = hdr->sh_info;
1052 buf = ((Elf_External_Sym *)
1053 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
1054 if (buf == NULL && extsymcount != 0)
1057 /* We store a pointer to the hash table entry for each external
1059 sym_hash = ((struct elf_link_hash_entry **)
1061 extsymcount * sizeof (struct elf_link_hash_entry *)));
1062 if (sym_hash == NULL)
1064 elf_sym_hashes (abfd) = sym_hash;
1070 /* If we are creating a shared library, create all the dynamic
1071 sections immediately. We need to attach them to something,
1072 so we attach them to this BFD, provided it is the right
1073 format. FIXME: If there are no input BFD's of the same
1074 format as the output, we can't make a shared library. */
1076 && ! elf_hash_table (info)->dynamic_sections_created
1077 && abfd->xvec == info->hash->creator)
1079 if (! elf_link_create_dynamic_sections (abfd, info))
1088 bfd_size_type oldsize;
1089 bfd_size_type strindex;
1091 /* Find the name to use in a DT_NEEDED entry that refers to this
1092 object. If the object has a DT_SONAME entry, we use it.
1093 Otherwise, if the generic linker stuck something in
1094 elf_dt_name, we use that. Otherwise, we just use the file
1095 name. If the generic linker put a null string into
1096 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1097 there is a DT_SONAME entry. */
1099 name = bfd_get_filename (abfd);
1100 if (elf_dt_name (abfd) != NULL)
1102 name = elf_dt_name (abfd);
1105 if (elf_dt_soname (abfd) != NULL)
1111 s = bfd_get_section_by_name (abfd, ".dynamic");
1114 Elf_External_Dyn *extdyn;
1115 Elf_External_Dyn *extdynend;
1121 dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
1125 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1126 (file_ptr) 0, s->_raw_size))
1129 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1132 link = elf_elfsections (abfd)[elfsec]->sh_link;
1135 /* The shared libraries distributed with hpux11 have a bogus
1136 sh_link field for the ".dynamic" section. This code detects
1137 when LINK refers to a section that is not a string table and
1138 tries to find the string table for the ".dynsym" section
1140 Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[link];
1141 if (hdr->sh_type != SHT_STRTAB)
1143 asection *s = bfd_get_section_by_name (abfd, ".dynsym");
1144 int elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1147 link = elf_elfsections (abfd)[elfsec]->sh_link;
1152 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1155 for (; extdyn < extdynend; extdyn++)
1157 Elf_Internal_Dyn dyn;
1159 elf_swap_dyn_in (abfd, extdyn, &dyn);
1160 if (dyn.d_tag == DT_SONAME)
1162 name = bfd_elf_string_from_elf_section (abfd, link,
1167 if (dyn.d_tag == DT_NEEDED)
1169 struct bfd_link_needed_list *n, **pn;
1172 n = ((struct bfd_link_needed_list *)
1173 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1174 fnm = bfd_elf_string_from_elf_section (abfd, link,
1176 if (n == NULL || fnm == NULL)
1178 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1185 for (pn = &elf_hash_table (info)->needed;
1191 if (dyn.d_tag == DT_RUNPATH)
1193 struct bfd_link_needed_list *n, **pn;
1196 /* When we see DT_RPATH before DT_RUNPATH, we have
1197 to clear runpath. Do _NOT_ bfd_release, as that
1198 frees all more recently bfd_alloc'd blocks as
1200 if (rpath && elf_hash_table (info)->runpath)
1201 elf_hash_table (info)->runpath = NULL;
1203 n = ((struct bfd_link_needed_list *)
1204 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1205 fnm = bfd_elf_string_from_elf_section (abfd, link,
1207 if (n == NULL || fnm == NULL)
1209 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1216 for (pn = &elf_hash_table (info)->runpath;
1224 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1225 if (!runpath && dyn.d_tag == DT_RPATH)
1227 struct bfd_link_needed_list *n, **pn;
1230 n = ((struct bfd_link_needed_list *)
1231 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1232 fnm = bfd_elf_string_from_elf_section (abfd, link,
1234 if (n == NULL || fnm == NULL)
1236 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1243 for (pn = &elf_hash_table (info)->runpath;
1256 /* We do not want to include any of the sections in a dynamic
1257 object in the output file. We hack by simply clobbering the
1258 list of sections in the BFD. This could be handled more
1259 cleanly by, say, a new section flag; the existing
1260 SEC_NEVER_LOAD flag is not the one we want, because that one
1261 still implies that the section takes up space in the output
1263 abfd->sections = NULL;
1264 abfd->section_count = 0;
1266 /* If this is the first dynamic object found in the link, create
1267 the special sections required for dynamic linking. */
1268 if (! elf_hash_table (info)->dynamic_sections_created)
1270 if (! elf_link_create_dynamic_sections (abfd, info))
1276 /* Add a DT_NEEDED entry for this dynamic object. */
1277 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1278 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
1280 if (strindex == (bfd_size_type) -1)
1283 if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1286 Elf_External_Dyn *dyncon, *dynconend;
1288 /* The hash table size did not change, which means that
1289 the dynamic object name was already entered. If we
1290 have already included this dynamic object in the
1291 link, just ignore it. There is no reason to include
1292 a particular dynamic object more than once. */
1293 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1295 BFD_ASSERT (sdyn != NULL);
1297 dyncon = (Elf_External_Dyn *) sdyn->contents;
1298 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1300 for (; dyncon < dynconend; dyncon++)
1302 Elf_Internal_Dyn dyn;
1304 elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
1306 if (dyn.d_tag == DT_NEEDED
1307 && dyn.d_un.d_val == strindex)
1311 if (extversym != NULL)
1318 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
1322 /* Save the SONAME, if there is one, because sometimes the
1323 linker emulation code will need to know it. */
1325 name = basename (bfd_get_filename (abfd));
1326 elf_dt_name (abfd) = name;
1330 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
1332 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
1333 != extsymcount * sizeof (Elf_External_Sym)))
1338 ever = extversym != NULL ? extversym + extsymoff : NULL;
1339 esymend = buf + extsymcount;
1342 esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
1344 Elf_Internal_Sym sym;
1350 struct elf_link_hash_entry *h;
1352 boolean size_change_ok, type_change_ok;
1353 boolean new_weakdef;
1354 unsigned int old_alignment;
1356 elf_swap_symbol_in (abfd, esym, &sym);
1358 flags = BSF_NO_FLAGS;
1360 value = sym.st_value;
1363 bind = ELF_ST_BIND (sym.st_info);
1364 if (bind == STB_LOCAL)
1366 /* This should be impossible, since ELF requires that all
1367 global symbols follow all local symbols, and that sh_info
1368 point to the first global symbol. Unfortunatealy, Irix 5
1372 else if (bind == STB_GLOBAL)
1374 if (sym.st_shndx != SHN_UNDEF
1375 && sym.st_shndx != SHN_COMMON)
1378 else if (bind == STB_WEAK)
1382 /* Leave it up to the processor backend. */
1385 if (sym.st_shndx == SHN_UNDEF)
1386 sec = bfd_und_section_ptr;
1387 else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
1389 sec = section_from_elf_index (abfd, sym.st_shndx);
1391 sec = bfd_abs_section_ptr;
1392 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1395 else if (sym.st_shndx == SHN_ABS)
1396 sec = bfd_abs_section_ptr;
1397 else if (sym.st_shndx == SHN_COMMON)
1399 sec = bfd_com_section_ptr;
1400 /* What ELF calls the size we call the value. What ELF
1401 calls the value we call the alignment. */
1402 value = sym.st_size;
1406 /* Leave it up to the processor backend. */
1409 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
1410 if (name == (const char *) NULL)
1413 if (add_symbol_hook)
1415 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
1419 /* The hook function sets the name to NULL if this symbol
1420 should be skipped for some reason. */
1421 if (name == (const char *) NULL)
1425 /* Sanity check that all possibilities were handled. */
1426 if (sec == (asection *) NULL)
1428 bfd_set_error (bfd_error_bad_value);
1432 if (bfd_is_und_section (sec)
1433 || bfd_is_com_section (sec))
1438 size_change_ok = false;
1439 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1441 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1443 Elf_Internal_Versym iver;
1444 unsigned int vernum = 0;
1449 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1450 vernum = iver.vs_vers & VERSYM_VERSION;
1452 /* If this is a hidden symbol, or if it is not version
1453 1, we append the version name to the symbol name.
1454 However, we do not modify a non-hidden absolute
1455 symbol, because it might be the version symbol
1456 itself. FIXME: What if it isn't? */
1457 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1458 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1461 int namelen, newlen;
1464 if (sym.st_shndx != SHN_UNDEF)
1466 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1468 (*_bfd_error_handler)
1469 (_("%s: %s: invalid version %u (max %d)"),
1470 bfd_get_filename (abfd), name, vernum,
1471 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1472 bfd_set_error (bfd_error_bad_value);
1475 else if (vernum > 1)
1477 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1483 /* We cannot simply test for the number of
1484 entries in the VERNEED section since the
1485 numbers for the needed versions do not start
1487 Elf_Internal_Verneed *t;
1490 for (t = elf_tdata (abfd)->verref;
1494 Elf_Internal_Vernaux *a;
1496 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1498 if (a->vna_other == vernum)
1500 verstr = a->vna_nodename;
1509 (*_bfd_error_handler)
1510 (_("%s: %s: invalid needed version %d"),
1511 bfd_get_filename (abfd), name, vernum);
1512 bfd_set_error (bfd_error_bad_value);
1517 namelen = strlen (name);
1518 newlen = namelen + strlen (verstr) + 2;
1519 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1522 newname = (char *) bfd_alloc (abfd, newlen);
1523 if (newname == NULL)
1525 strcpy (newname, name);
1526 p = newname + namelen;
1528 /* If this is a defined non-hidden version symbol,
1529 we add another @ to the name. This indicates the
1530 default version of the symbol. */
1531 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1532 && sym.st_shndx != SHN_UNDEF)
1540 if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
1541 sym_hash, &override, &type_change_ok,
1542 &size_change_ok, dt_needed))
1549 while (h->root.type == bfd_link_hash_indirect
1550 || h->root.type == bfd_link_hash_warning)
1551 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1553 /* Remember the old alignment if this is a common symbol, so
1554 that we don't reduce the alignment later on. We can't
1555 check later, because _bfd_generic_link_add_one_symbol
1556 will set a default for the alignment which we want to
1558 if (h->root.type == bfd_link_hash_common)
1559 old_alignment = h->root.u.c.p->alignment_power;
1561 if (elf_tdata (abfd)->verdef != NULL
1565 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1568 if (! (_bfd_generic_link_add_one_symbol
1569 (info, abfd, name, flags, sec, value, (const char *) NULL,
1570 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1574 while (h->root.type == bfd_link_hash_indirect
1575 || h->root.type == bfd_link_hash_warning)
1576 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1579 new_weakdef = false;
1582 && (flags & BSF_WEAK) != 0
1583 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
1584 && info->hash->creator->flavour == bfd_target_elf_flavour
1585 && h->weakdef == NULL)
1587 /* Keep a list of all weak defined non function symbols from
1588 a dynamic object, using the weakdef field. Later in this
1589 function we will set the weakdef field to the correct
1590 value. We only put non-function symbols from dynamic
1591 objects on this list, because that happens to be the only
1592 time we need to know the normal symbol corresponding to a
1593 weak symbol, and the information is time consuming to
1594 figure out. If the weakdef field is not already NULL,
1595 then this symbol was already defined by some previous
1596 dynamic object, and we will be using that previous
1597 definition anyhow. */
1604 /* Set the alignment of a common symbol. */
1605 if (sym.st_shndx == SHN_COMMON
1606 && h->root.type == bfd_link_hash_common)
1610 align = bfd_log2 (sym.st_value);
1611 if (align > old_alignment
1612 /* Permit an alignment power of zero if an alignment of one
1613 is specified and no other alignments have been specified. */
1614 || (sym.st_value == 1 && old_alignment == 0))
1615 h->root.u.c.p->alignment_power = align;
1618 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1624 /* Remember the symbol size and type. */
1625 if (sym.st_size != 0
1626 && (definition || h->size == 0))
1628 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
1629 (*_bfd_error_handler)
1630 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1631 name, (unsigned long) h->size, (unsigned long) sym.st_size,
1632 bfd_get_filename (abfd));
1634 h->size = sym.st_size;
1637 /* If this is a common symbol, then we always want H->SIZE
1638 to be the size of the common symbol. The code just above
1639 won't fix the size if a common symbol becomes larger. We
1640 don't warn about a size change here, because that is
1641 covered by --warn-common. */
1642 if (h->root.type == bfd_link_hash_common)
1643 h->size = h->root.u.c.size;
1645 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
1646 && (definition || h->type == STT_NOTYPE))
1648 if (h->type != STT_NOTYPE
1649 && h->type != ELF_ST_TYPE (sym.st_info)
1650 && ! type_change_ok)
1651 (*_bfd_error_handler)
1652 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1653 name, h->type, ELF_ST_TYPE (sym.st_info),
1654 bfd_get_filename (abfd));
1656 h->type = ELF_ST_TYPE (sym.st_info);
1659 /* If st_other has a processor-specific meaning, specific code
1660 might be needed here. */
1661 if (sym.st_other != 0)
1663 /* Combine visibilities, using the most constraining one. */
1664 unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1665 unsigned char symvis = ELF_ST_VISIBILITY (sym.st_other);
1667 if (symvis && (hvis > symvis || hvis == 0))
1668 h->other = sym.st_other;
1670 /* If neither has visibility, use the st_other of the
1671 definition. This is an arbitrary choice, since the
1672 other bits have no general meaning. */
1673 if (!symvis && !hvis
1674 && (definition || h->other == 0))
1675 h->other = sym.st_other;
1678 /* Set a flag in the hash table entry indicating the type of
1679 reference or definition we just found. Keep a count of
1680 the number of dynamic symbols we find. A dynamic symbol
1681 is one which is referenced or defined by both a regular
1682 object and a shared object. */
1683 old_flags = h->elf_link_hash_flags;
1689 new_flag = ELF_LINK_HASH_REF_REGULAR;
1690 if (bind != STB_WEAK)
1691 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
1694 new_flag = ELF_LINK_HASH_DEF_REGULAR;
1696 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1697 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
1703 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
1705 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
1706 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
1707 | ELF_LINK_HASH_REF_REGULAR)) != 0
1708 || (h->weakdef != NULL
1710 && h->weakdef->dynindx != -1))
1714 h->elf_link_hash_flags |= new_flag;
1716 /* If this symbol has a version, and it is the default
1717 version, we create an indirect symbol from the default
1718 name to the fully decorated name. This will cause
1719 external references which do not specify a version to be
1720 bound to this version of the symbol. */
1721 if (definition || h->root.type == bfd_link_hash_common)
1725 p = strchr (name, ELF_VER_CHR);
1726 if (p != NULL && p[1] == ELF_VER_CHR)
1729 struct elf_link_hash_entry *hi;
1732 shortname = bfd_hash_allocate (&info->hash->table,
1734 if (shortname == NULL)
1736 strncpy (shortname, name, p - name);
1737 shortname[p - name] = '\0';
1739 /* We are going to create a new symbol. Merge it
1740 with any existing symbol with this name. For the
1741 purposes of the merge, act as though we were
1742 defining the symbol we just defined, although we
1743 actually going to define an indirect symbol. */
1744 type_change_ok = false;
1745 size_change_ok = false;
1746 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1747 &value, &hi, &override,
1749 &size_change_ok, dt_needed))
1754 if (! (_bfd_generic_link_add_one_symbol
1755 (info, abfd, shortname, BSF_INDIRECT,
1756 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1757 collect, (struct bfd_link_hash_entry **) &hi)))
1762 /* In this case the symbol named SHORTNAME is
1763 overriding the indirect symbol we want to
1764 add. We were planning on making SHORTNAME an
1765 indirect symbol referring to NAME. SHORTNAME
1766 is the name without a version. NAME is the
1767 fully versioned name, and it is the default
1770 Overriding means that we already saw a
1771 definition for the symbol SHORTNAME in a
1772 regular object, and it is overriding the
1773 symbol defined in the dynamic object.
1775 When this happens, we actually want to change
1776 NAME, the symbol we just added, to refer to
1777 SHORTNAME. This will cause references to
1778 NAME in the shared object to become
1779 references to SHORTNAME in the regular
1780 object. This is what we expect when we
1781 override a function in a shared object: that
1782 the references in the shared object will be
1783 mapped to the definition in the regular
1786 while (hi->root.type == bfd_link_hash_indirect
1787 || hi->root.type == bfd_link_hash_warning)
1788 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1790 h->root.type = bfd_link_hash_indirect;
1791 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1792 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1794 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1795 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1796 if (hi->elf_link_hash_flags
1797 & (ELF_LINK_HASH_REF_REGULAR
1798 | ELF_LINK_HASH_DEF_REGULAR))
1800 if (! _bfd_elf_link_record_dynamic_symbol (info,
1806 /* Now set HI to H, so that the following code
1807 will set the other fields correctly. */
1811 /* If there is a duplicate definition somewhere,
1812 then HI may not point to an indirect symbol. We
1813 will have reported an error to the user in that
1816 if (hi->root.type == bfd_link_hash_indirect)
1818 struct elf_link_hash_entry *ht;
1820 /* If the symbol became indirect, then we assume
1821 that we have not seen a definition before. */
1822 BFD_ASSERT ((hi->elf_link_hash_flags
1823 & (ELF_LINK_HASH_DEF_DYNAMIC
1824 | ELF_LINK_HASH_DEF_REGULAR))
1827 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1828 (*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1830 /* See if the new flags lead us to realize that
1831 the symbol must be dynamic. */
1837 || ((hi->elf_link_hash_flags
1838 & ELF_LINK_HASH_REF_DYNAMIC)
1844 if ((hi->elf_link_hash_flags
1845 & ELF_LINK_HASH_REF_REGULAR) != 0)
1851 /* We also need to define an indirection from the
1852 nondefault version of the symbol. */
1854 shortname = bfd_hash_allocate (&info->hash->table,
1856 if (shortname == NULL)
1858 strncpy (shortname, name, p - name);
1859 strcpy (shortname + (p - name), p + 1);
1861 /* Once again, merge with any existing symbol. */
1862 type_change_ok = false;
1863 size_change_ok = false;
1864 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1865 &value, &hi, &override,
1867 &size_change_ok, dt_needed))
1872 /* Here SHORTNAME is a versioned name, so we
1873 don't expect to see the type of override we
1874 do in the case above. */
1875 (*_bfd_error_handler)
1876 (_("%s: warning: unexpected redefinition of `%s'"),
1877 bfd_get_filename (abfd), shortname);
1881 if (! (_bfd_generic_link_add_one_symbol
1882 (info, abfd, shortname, BSF_INDIRECT,
1883 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1884 collect, (struct bfd_link_hash_entry **) &hi)))
1887 /* If there is a duplicate definition somewhere,
1888 then HI may not point to an indirect symbol.
1889 We will have reported an error to the user in
1892 if (hi->root.type == bfd_link_hash_indirect)
1894 /* If the symbol became indirect, then we
1895 assume that we have not seen a definition
1897 BFD_ASSERT ((hi->elf_link_hash_flags
1898 & (ELF_LINK_HASH_DEF_DYNAMIC
1899 | ELF_LINK_HASH_DEF_REGULAR))
1902 (*bed->elf_backend_copy_indirect_symbol) (h, hi);
1904 /* See if the new flags lead us to realize
1905 that the symbol must be dynamic. */
1911 || ((hi->elf_link_hash_flags
1912 & ELF_LINK_HASH_REF_DYNAMIC)
1918 if ((hi->elf_link_hash_flags
1919 & ELF_LINK_HASH_REF_REGULAR) != 0)
1928 if (dynsym && h->dynindx == -1)
1930 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1932 if (h->weakdef != NULL
1934 && h->weakdef->dynindx == -1)
1936 if (! _bfd_elf_link_record_dynamic_symbol (info,
1941 else if (dynsym && h->dynindx != -1)
1942 /* If the symbol already has a dynamic index, but
1943 visibility says it should not be visible, turn it into
1945 switch (ELF_ST_VISIBILITY (h->other))
1949 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
1950 (*bed->elf_backend_hide_symbol) (info, h);
1954 if (dt_needed && definition
1955 && (h->elf_link_hash_flags
1956 & ELF_LINK_HASH_REF_REGULAR) != 0)
1958 bfd_size_type oldsize;
1959 bfd_size_type strindex;
1961 /* The symbol from a DT_NEEDED object is referenced from
1962 the regular object to create a dynamic executable. We
1963 have to make sure there is a DT_NEEDED entry for it. */
1966 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1967 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
1968 elf_dt_soname (abfd),
1970 if (strindex == (bfd_size_type) -1)
1974 == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1977 Elf_External_Dyn *dyncon, *dynconend;
1979 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1981 BFD_ASSERT (sdyn != NULL);
1983 dyncon = (Elf_External_Dyn *) sdyn->contents;
1984 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1986 for (; dyncon < dynconend; dyncon++)
1988 Elf_Internal_Dyn dyn;
1990 elf_swap_dyn_in (elf_hash_table (info)->dynobj,
1992 BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
1993 dyn.d_un.d_val != strindex);
1997 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
2003 /* Now set the weakdefs field correctly for all the weak defined
2004 symbols we found. The only way to do this is to search all the
2005 symbols. Since we only need the information for non functions in
2006 dynamic objects, that's the only time we actually put anything on
2007 the list WEAKS. We need this information so that if a regular
2008 object refers to a symbol defined weakly in a dynamic object, the
2009 real symbol in the dynamic object is also put in the dynamic
2010 symbols; we also must arrange for both symbols to point to the
2011 same memory location. We could handle the general case of symbol
2012 aliasing, but a general symbol alias can only be generated in
2013 assembler code, handling it correctly would be very time
2014 consuming, and other ELF linkers don't handle general aliasing
2016 while (weaks != NULL)
2018 struct elf_link_hash_entry *hlook;
2021 struct elf_link_hash_entry **hpp;
2022 struct elf_link_hash_entry **hppend;
2025 weaks = hlook->weakdef;
2026 hlook->weakdef = NULL;
2028 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2029 || hlook->root.type == bfd_link_hash_defweak
2030 || hlook->root.type == bfd_link_hash_common
2031 || hlook->root.type == bfd_link_hash_indirect);
2032 slook = hlook->root.u.def.section;
2033 vlook = hlook->root.u.def.value;
2035 hpp = elf_sym_hashes (abfd);
2036 hppend = hpp + extsymcount;
2037 for (; hpp < hppend; hpp++)
2039 struct elf_link_hash_entry *h;
2042 if (h != NULL && h != hlook
2043 && h->root.type == bfd_link_hash_defined
2044 && h->root.u.def.section == slook
2045 && h->root.u.def.value == vlook)
2049 /* If the weak definition is in the list of dynamic
2050 symbols, make sure the real definition is put there
2052 if (hlook->dynindx != -1
2053 && h->dynindx == -1)
2055 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2059 /* If the real definition is in the list of dynamic
2060 symbols, make sure the weak definition is put there
2061 as well. If we don't do this, then the dynamic
2062 loader might not merge the entries for the real
2063 definition and the weak definition. */
2064 if (h->dynindx != -1
2065 && hlook->dynindx == -1)
2067 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2082 if (extversym != NULL)
2088 /* If this object is the same format as the output object, and it is
2089 not a shared library, then let the backend look through the
2092 This is required to build global offset table entries and to
2093 arrange for dynamic relocs. It is not required for the
2094 particular common case of linking non PIC code, even when linking
2095 against shared libraries, but unfortunately there is no way of
2096 knowing whether an object file has been compiled PIC or not.
2097 Looking through the relocs is not particularly time consuming.
2098 The problem is that we must either (1) keep the relocs in memory,
2099 which causes the linker to require additional runtime memory or
2100 (2) read the relocs twice from the input file, which wastes time.
2101 This would be a good case for using mmap.
2103 I have no idea how to handle linking PIC code into a file of a
2104 different format. It probably can't be done. */
2105 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2107 && abfd->xvec == info->hash->creator
2108 && check_relocs != NULL)
2112 for (o = abfd->sections; o != NULL; o = o->next)
2114 Elf_Internal_Rela *internal_relocs;
2117 if ((o->flags & SEC_RELOC) == 0
2118 || o->reloc_count == 0
2119 || ((info->strip == strip_all || info->strip == strip_debugger)
2120 && (o->flags & SEC_DEBUGGING) != 0)
2121 || bfd_is_abs_section (o->output_section))
2124 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2125 (abfd, o, (PTR) NULL,
2126 (Elf_Internal_Rela *) NULL,
2127 info->keep_memory));
2128 if (internal_relocs == NULL)
2131 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2133 if (! info->keep_memory)
2134 free (internal_relocs);
2141 /* If this is a non-traditional, non-relocateable link, try to
2142 optimize the handling of the .stab/.stabstr sections. */
2144 && ! info->relocateable
2145 && ! info->traditional_format
2146 && info->hash->creator->flavour == bfd_target_elf_flavour
2147 && (info->strip != strip_all && info->strip != strip_debugger))
2149 asection *stab, *stabstr;
2151 stab = bfd_get_section_by_name (abfd, ".stab");
2154 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2156 if (stabstr != NULL)
2158 struct bfd_elf_section_data *secdata;
2160 secdata = elf_section_data (stab);
2161 if (! _bfd_link_section_stabs (abfd,
2162 &elf_hash_table (info)->stab_info,
2164 &secdata->stab_info))
2170 if (! info->relocateable && ! dynamic)
2174 for (s = abfd->sections; s != NULL; s = s->next)
2175 if ((s->flags & SEC_MERGE)
2176 && ! _bfd_merge_section (abfd,
2177 &elf_hash_table (info)->merge_info,
2178 s, &elf_section_data (s)->merge_info))
2189 if (extversym != NULL)
2194 /* Create some sections which will be filled in with dynamic linking
2195 information. ABFD is an input file which requires dynamic sections
2196 to be created. The dynamic sections take up virtual memory space
2197 when the final executable is run, so we need to create them before
2198 addresses are assigned to the output sections. We work out the
2199 actual contents and size of these sections later. */
2202 elf_link_create_dynamic_sections (abfd, info)
2204 struct bfd_link_info *info;
2207 register asection *s;
2208 struct elf_link_hash_entry *h;
2209 struct elf_backend_data *bed;
2211 if (elf_hash_table (info)->dynamic_sections_created)
2214 /* Make sure that all dynamic sections use the same input BFD. */
2215 if (elf_hash_table (info)->dynobj == NULL)
2216 elf_hash_table (info)->dynobj = abfd;
2218 abfd = elf_hash_table (info)->dynobj;
2220 /* Note that we set the SEC_IN_MEMORY flag for all of these
2222 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2223 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2225 /* A dynamically linked executable has a .interp section, but a
2226 shared library does not. */
2229 s = bfd_make_section (abfd, ".interp");
2231 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2235 /* Create sections to hold version informations. These are removed
2236 if they are not needed. */
2237 s = bfd_make_section (abfd, ".gnu.version_d");
2239 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2240 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2243 s = bfd_make_section (abfd, ".gnu.version");
2245 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2246 || ! bfd_set_section_alignment (abfd, s, 1))
2249 s = bfd_make_section (abfd, ".gnu.version_r");
2251 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2252 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2255 s = bfd_make_section (abfd, ".dynsym");
2257 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2258 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2261 s = bfd_make_section (abfd, ".dynstr");
2263 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2266 /* Create a strtab to hold the dynamic symbol names. */
2267 if (elf_hash_table (info)->dynstr == NULL)
2269 elf_hash_table (info)->dynstr = elf_stringtab_init ();
2270 if (elf_hash_table (info)->dynstr == NULL)
2274 s = bfd_make_section (abfd, ".dynamic");
2276 || ! bfd_set_section_flags (abfd, s, flags)
2277 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2280 /* The special symbol _DYNAMIC is always set to the start of the
2281 .dynamic section. This call occurs before we have processed the
2282 symbols for any dynamic object, so we don't have to worry about
2283 overriding a dynamic definition. We could set _DYNAMIC in a
2284 linker script, but we only want to define it if we are, in fact,
2285 creating a .dynamic section. We don't want to define it if there
2286 is no .dynamic section, since on some ELF platforms the start up
2287 code examines it to decide how to initialize the process. */
2289 if (! (_bfd_generic_link_add_one_symbol
2290 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2291 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2292 (struct bfd_link_hash_entry **) &h)))
2294 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2295 h->type = STT_OBJECT;
2298 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2301 bed = get_elf_backend_data (abfd);
2303 s = bfd_make_section (abfd, ".hash");
2305 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2306 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2308 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2310 /* Let the backend create the rest of the sections. This lets the
2311 backend set the right flags. The backend will normally create
2312 the .got and .plt sections. */
2313 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2316 elf_hash_table (info)->dynamic_sections_created = true;
2321 /* Add an entry to the .dynamic table. */
2324 elf_add_dynamic_entry (info, tag, val)
2325 struct bfd_link_info *info;
2329 Elf_Internal_Dyn dyn;
2333 bfd_byte *newcontents;
2335 dynobj = elf_hash_table (info)->dynobj;
2337 s = bfd_get_section_by_name (dynobj, ".dynamic");
2338 BFD_ASSERT (s != NULL);
2340 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2341 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2342 if (newcontents == NULL)
2346 dyn.d_un.d_val = val;
2347 elf_swap_dyn_out (dynobj, &dyn,
2348 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2350 s->_raw_size = newsize;
2351 s->contents = newcontents;
2356 /* Record a new local dynamic symbol. */
2359 elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2360 struct bfd_link_info *info;
2364 struct elf_link_local_dynamic_entry *entry;
2365 struct elf_link_hash_table *eht;
2366 struct bfd_strtab_hash *dynstr;
2367 Elf_External_Sym esym;
2368 unsigned long dynstr_index;
2371 /* See if the entry exists already. */
2372 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2373 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2376 entry = (struct elf_link_local_dynamic_entry *)
2377 bfd_alloc (input_bfd, sizeof (*entry));
2381 /* Go find the symbol, so that we can find it's name. */
2382 if (bfd_seek (input_bfd,
2383 (elf_tdata (input_bfd)->symtab_hdr.sh_offset
2384 + input_indx * sizeof (Elf_External_Sym)),
2386 || (bfd_read (&esym, sizeof (Elf_External_Sym), 1, input_bfd)
2387 != sizeof (Elf_External_Sym)))
2389 elf_swap_symbol_in (input_bfd, &esym, &entry->isym);
2391 name = (bfd_elf_string_from_elf_section
2392 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2393 entry->isym.st_name));
2395 dynstr = elf_hash_table (info)->dynstr;
2398 /* Create a strtab to hold the dynamic symbol names. */
2399 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_stringtab_init ();
2404 dynstr_index = _bfd_stringtab_add (dynstr, name, true, false);
2405 if (dynstr_index == (unsigned long) -1)
2407 entry->isym.st_name = dynstr_index;
2409 eht = elf_hash_table (info);
2411 entry->next = eht->dynlocal;
2412 eht->dynlocal = entry;
2413 entry->input_bfd = input_bfd;
2414 entry->input_indx = input_indx;
2417 /* Whatever binding the symbol had before, it's now local. */
2419 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2421 /* The dynindx will be set at the end of size_dynamic_sections. */
2426 /* Read and swap the relocs from the section indicated by SHDR. This
2427 may be either a REL or a RELA section. The relocations are
2428 translated into RELA relocations and stored in INTERNAL_RELOCS,
2429 which should have already been allocated to contain enough space.
2430 The EXTERNAL_RELOCS are a buffer where the external form of the
2431 relocations should be stored.
2433 Returns false if something goes wrong. */
2436 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2439 Elf_Internal_Shdr *shdr;
2440 PTR external_relocs;
2441 Elf_Internal_Rela *internal_relocs;
2443 struct elf_backend_data *bed;
2445 /* If there aren't any relocations, that's OK. */
2449 /* Position ourselves at the start of the section. */
2450 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2453 /* Read the relocations. */
2454 if (bfd_read (external_relocs, 1, shdr->sh_size, abfd)
2458 bed = get_elf_backend_data (abfd);
2460 /* Convert the external relocations to the internal format. */
2461 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2463 Elf_External_Rel *erel;
2464 Elf_External_Rel *erelend;
2465 Elf_Internal_Rela *irela;
2466 Elf_Internal_Rel *irel;
2468 erel = (Elf_External_Rel *) external_relocs;
2469 erelend = erel + NUM_SHDR_ENTRIES (shdr);
2470 irela = internal_relocs;
2471 irel = bfd_alloc (abfd, (bed->s->int_rels_per_ext_rel
2472 * sizeof (Elf_Internal_Rel)));
2473 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2477 if (bed->s->swap_reloc_in)
2478 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2480 elf_swap_reloc_in (abfd, erel, irel);
2482 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2484 irela[i].r_offset = irel[i].r_offset;
2485 irela[i].r_info = irel[i].r_info;
2486 irela[i].r_addend = 0;
2492 Elf_External_Rela *erela;
2493 Elf_External_Rela *erelaend;
2494 Elf_Internal_Rela *irela;
2496 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2498 erela = (Elf_External_Rela *) external_relocs;
2499 erelaend = erela + NUM_SHDR_ENTRIES (shdr);
2500 irela = internal_relocs;
2501 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2503 if (bed->s->swap_reloca_in)
2504 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2506 elf_swap_reloca_in (abfd, erela, irela);
2513 /* Read and swap the relocs for a section O. They may have been
2514 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2515 not NULL, they are used as buffers to read into. They are known to
2516 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2517 the return value is allocated using either malloc or bfd_alloc,
2518 according to the KEEP_MEMORY argument. If O has two relocation
2519 sections (both REL and RELA relocations), then the REL_HDR
2520 relocations will appear first in INTERNAL_RELOCS, followed by the
2521 REL_HDR2 relocations. */
2524 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2528 PTR external_relocs;
2529 Elf_Internal_Rela *internal_relocs;
2530 boolean keep_memory;
2532 Elf_Internal_Shdr *rel_hdr;
2534 Elf_Internal_Rela *alloc2 = NULL;
2535 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2537 if (elf_section_data (o)->relocs != NULL)
2538 return elf_section_data (o)->relocs;
2540 if (o->reloc_count == 0)
2543 rel_hdr = &elf_section_data (o)->rel_hdr;
2545 if (internal_relocs == NULL)
2549 size = (o->reloc_count * bed->s->int_rels_per_ext_rel
2550 * sizeof (Elf_Internal_Rela));
2552 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2554 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2555 if (internal_relocs == NULL)
2559 if (external_relocs == NULL)
2561 size_t size = (size_t) rel_hdr->sh_size;
2563 if (elf_section_data (o)->rel_hdr2)
2564 size += (size_t) elf_section_data (o)->rel_hdr2->sh_size;
2565 alloc1 = (PTR) bfd_malloc (size);
2568 external_relocs = alloc1;
2571 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2575 if (!elf_link_read_relocs_from_section
2577 elf_section_data (o)->rel_hdr2,
2578 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2579 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2580 * bed->s->int_rels_per_ext_rel)))
2583 /* Cache the results for next time, if we can. */
2585 elf_section_data (o)->relocs = internal_relocs;
2590 /* Don't free alloc2, since if it was allocated we are passing it
2591 back (under the name of internal_relocs). */
2593 return internal_relocs;
2603 /* Record an assignment to a symbol made by a linker script. We need
2604 this in case some dynamic object refers to this symbol. */
2608 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2609 bfd *output_bfd ATTRIBUTE_UNUSED;
2610 struct bfd_link_info *info;
2614 struct elf_link_hash_entry *h;
2616 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2619 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2623 if (h->root.type == bfd_link_hash_new)
2624 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
2626 /* If this symbol is being provided by the linker script, and it is
2627 currently defined by a dynamic object, but not by a regular
2628 object, then mark it as undefined so that the generic linker will
2629 force the correct value. */
2631 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2632 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2633 h->root.type = bfd_link_hash_undefined;
2635 /* If this symbol is not being provided by the linker script, and it is
2636 currently defined by a dynamic object, but not by a regular object,
2637 then clear out any version information because the symbol will not be
2638 associated with the dynamic object any more. */
2640 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2641 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2642 h->verinfo.verdef = NULL;
2644 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2646 /* When possible, keep the original type of the symbol */
2647 if (h->type == STT_NOTYPE)
2648 h->type = STT_OBJECT;
2650 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2651 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2653 && h->dynindx == -1)
2655 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2658 /* If this is a weak defined symbol, and we know a corresponding
2659 real symbol from the same dynamic object, make sure the real
2660 symbol is also made into a dynamic symbol. */
2661 if (h->weakdef != NULL
2662 && h->weakdef->dynindx == -1)
2664 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2672 /* This structure is used to pass information to
2673 elf_link_assign_sym_version. */
2675 struct elf_assign_sym_version_info
2679 /* General link information. */
2680 struct bfd_link_info *info;
2682 struct bfd_elf_version_tree *verdefs;
2683 /* Whether we are exporting all dynamic symbols. */
2684 boolean export_dynamic;
2685 /* Whether we had a failure. */
2689 /* This structure is used to pass information to
2690 elf_link_find_version_dependencies. */
2692 struct elf_find_verdep_info
2696 /* General link information. */
2697 struct bfd_link_info *info;
2698 /* The number of dependencies. */
2700 /* Whether we had a failure. */
2704 /* Array used to determine the number of hash table buckets to use
2705 based on the number of symbols there are. If there are fewer than
2706 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2707 fewer than 37 we use 17 buckets, and so forth. We never use more
2708 than 32771 buckets. */
2710 static const size_t elf_buckets[] =
2712 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2716 /* Compute bucket count for hashing table. We do not use a static set
2717 of possible tables sizes anymore. Instead we determine for all
2718 possible reasonable sizes of the table the outcome (i.e., the
2719 number of collisions etc) and choose the best solution. The
2720 weighting functions are not too simple to allow the table to grow
2721 without bounds. Instead one of the weighting factors is the size.
2722 Therefore the result is always a good payoff between few collisions
2723 (= short chain lengths) and table size. */
2725 compute_bucket_count (info)
2726 struct bfd_link_info *info;
2728 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2729 size_t best_size = 0;
2730 unsigned long int *hashcodes;
2731 unsigned long int *hashcodesp;
2732 unsigned long int i;
2734 /* Compute the hash values for all exported symbols. At the same
2735 time store the values in an array so that we could use them for
2737 hashcodes = (unsigned long int *) bfd_malloc (dynsymcount
2738 * sizeof (unsigned long int));
2739 if (hashcodes == NULL)
2741 hashcodesp = hashcodes;
2743 /* Put all hash values in HASHCODES. */
2744 elf_link_hash_traverse (elf_hash_table (info),
2745 elf_collect_hash_codes, &hashcodesp);
2747 /* We have a problem here. The following code to optimize the table
2748 size requires an integer type with more the 32 bits. If
2749 BFD_HOST_U_64_BIT is set we know about such a type. */
2750 #ifdef BFD_HOST_U_64_BIT
2751 if (info->optimize == true)
2753 unsigned long int nsyms = hashcodesp - hashcodes;
2756 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2757 unsigned long int *counts ;
2759 /* Possible optimization parameters: if we have NSYMS symbols we say
2760 that the hashing table must at least have NSYMS/4 and at most
2762 minsize = nsyms / 4;
2765 best_size = maxsize = nsyms * 2;
2767 /* Create array where we count the collisions in. We must use bfd_malloc
2768 since the size could be large. */
2769 counts = (unsigned long int *) bfd_malloc (maxsize
2770 * sizeof (unsigned long int));
2777 /* Compute the "optimal" size for the hash table. The criteria is a
2778 minimal chain length. The minor criteria is (of course) the size
2780 for (i = minsize; i < maxsize; ++i)
2782 /* Walk through the array of hashcodes and count the collisions. */
2783 BFD_HOST_U_64_BIT max;
2784 unsigned long int j;
2785 unsigned long int fact;
2787 memset (counts, '\0', i * sizeof (unsigned long int));
2789 /* Determine how often each hash bucket is used. */
2790 for (j = 0; j < nsyms; ++j)
2791 ++counts[hashcodes[j] % i];
2793 /* For the weight function we need some information about the
2794 pagesize on the target. This is information need not be 100%
2795 accurate. Since this information is not available (so far) we
2796 define it here to a reasonable default value. If it is crucial
2797 to have a better value some day simply define this value. */
2798 # ifndef BFD_TARGET_PAGESIZE
2799 # define BFD_TARGET_PAGESIZE (4096)
2802 /* We in any case need 2 + NSYMS entries for the size values and
2804 max = (2 + nsyms) * (ARCH_SIZE / 8);
2807 /* Variant 1: optimize for short chains. We add the squares
2808 of all the chain lengths (which favous many small chain
2809 over a few long chains). */
2810 for (j = 0; j < i; ++j)
2811 max += counts[j] * counts[j];
2813 /* This adds penalties for the overall size of the table. */
2814 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2817 /* Variant 2: Optimize a lot more for small table. Here we
2818 also add squares of the size but we also add penalties for
2819 empty slots (the +1 term). */
2820 for (j = 0; j < i; ++j)
2821 max += (1 + counts[j]) * (1 + counts[j]);
2823 /* The overall size of the table is considered, but not as
2824 strong as in variant 1, where it is squared. */
2825 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2829 /* Compare with current best results. */
2830 if (max < best_chlen)
2840 #endif /* defined (BFD_HOST_U_64_BIT) */
2842 /* This is the fallback solution if no 64bit type is available or if we
2843 are not supposed to spend much time on optimizations. We select the
2844 bucket count using a fixed set of numbers. */
2845 for (i = 0; elf_buckets[i] != 0; i++)
2847 best_size = elf_buckets[i];
2848 if (dynsymcount < elf_buckets[i + 1])
2853 /* Free the arrays we needed. */
2859 /* Set up the sizes and contents of the ELF dynamic sections. This is
2860 called by the ELF linker emulation before_allocation routine. We
2861 must set the sizes of the sections before the linker sets the
2862 addresses of the various sections. */
2865 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
2866 export_dynamic, filter_shlib,
2867 auxiliary_filters, info, sinterpptr,
2872 boolean export_dynamic;
2873 const char *filter_shlib;
2874 const char * const *auxiliary_filters;
2875 struct bfd_link_info *info;
2876 asection **sinterpptr;
2877 struct bfd_elf_version_tree *verdefs;
2879 bfd_size_type soname_indx;
2881 struct elf_backend_data *bed;
2882 struct elf_assign_sym_version_info asvinfo;
2886 soname_indx = (bfd_size_type) -1;
2888 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2891 /* The backend may have to create some sections regardless of whether
2892 we're dynamic or not. */
2893 bed = get_elf_backend_data (output_bfd);
2894 if (bed->elf_backend_always_size_sections
2895 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
2898 dynobj = elf_hash_table (info)->dynobj;
2900 /* If there were no dynamic objects in the link, there is nothing to
2905 if (elf_hash_table (info)->dynamic_sections_created)
2907 struct elf_info_failed eif;
2908 struct elf_link_hash_entry *h;
2911 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
2912 BFD_ASSERT (*sinterpptr != NULL || info->shared);
2916 soname_indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2917 soname, true, true);
2918 if (soname_indx == (bfd_size_type) -1
2919 || ! elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
2925 if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
2927 info->flags |= DF_SYMBOLIC;
2934 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
2936 if (indx == (bfd_size_type) -1
2937 || ! elf_add_dynamic_entry (info, DT_RPATH, indx)
2939 && ! elf_add_dynamic_entry (info, DT_RUNPATH, indx)))
2943 if (filter_shlib != NULL)
2947 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2948 filter_shlib, true, true);
2949 if (indx == (bfd_size_type) -1
2950 || ! elf_add_dynamic_entry (info, DT_FILTER, indx))
2954 if (auxiliary_filters != NULL)
2956 const char * const *p;
2958 for (p = auxiliary_filters; *p != NULL; p++)
2962 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2964 if (indx == (bfd_size_type) -1
2965 || ! elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
2971 eif.verdefs = verdefs;
2974 /* If we are supposed to export all symbols into the dynamic symbol
2975 table (this is not the normal case), then do so. */
2978 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
2984 /* Attach all the symbols to their version information. */
2985 asvinfo.output_bfd = output_bfd;
2986 asvinfo.info = info;
2987 asvinfo.verdefs = verdefs;
2988 asvinfo.export_dynamic = export_dynamic;
2989 asvinfo.failed = false;
2991 elf_link_hash_traverse (elf_hash_table (info),
2992 elf_link_assign_sym_version,
2997 /* Find all symbols which were defined in a dynamic object and make
2998 the backend pick a reasonable value for them. */
2999 elf_link_hash_traverse (elf_hash_table (info),
3000 elf_adjust_dynamic_symbol,
3005 /* Add some entries to the .dynamic section. We fill in some of the
3006 values later, in elf_bfd_final_link, but we must add the entries
3007 now so that we know the final size of the .dynamic section. */
3009 /* If there are initialization and/or finalization functions to
3010 call then add the corresponding DT_INIT/DT_FINI entries. */
3011 h = (info->init_function
3012 ? elf_link_hash_lookup (elf_hash_table (info),
3013 info->init_function, false,
3017 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3018 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3020 if (! elf_add_dynamic_entry (info, DT_INIT, 0))
3023 h = (info->fini_function
3024 ? elf_link_hash_lookup (elf_hash_table (info),
3025 info->fini_function, false,
3029 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3030 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3032 if (! elf_add_dynamic_entry (info, DT_FINI, 0))
3036 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
3037 /* If .dynstr is excluded from the link, we don't want any of
3038 these tags. Strictly, we should be checking each section
3039 individually; This quick check covers for the case where
3040 someone does a /DISCARD/ : { *(*) }. */
3041 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
3043 bfd_size_type strsize;
3045 strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3046 if (! elf_add_dynamic_entry (info, DT_HASH, 0)
3047 || ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
3048 || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
3049 || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
3050 || ! elf_add_dynamic_entry (info, DT_SYMENT,
3051 sizeof (Elf_External_Sym)))
3056 /* The backend must work out the sizes of all the other dynamic
3058 if (bed->elf_backend_size_dynamic_sections
3059 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3062 if (elf_hash_table (info)->dynamic_sections_created)
3066 size_t bucketcount = 0;
3067 size_t hash_entry_size;
3069 /* Set up the version definition section. */
3070 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3071 BFD_ASSERT (s != NULL);
3073 /* We may have created additional version definitions if we are
3074 just linking a regular application. */
3075 verdefs = asvinfo.verdefs;
3077 if (verdefs == NULL)
3078 _bfd_strip_section_from_output (info, s);
3083 struct bfd_elf_version_tree *t;
3085 Elf_Internal_Verdef def;
3086 Elf_Internal_Verdaux defaux;
3091 /* Make space for the base version. */
3092 size += sizeof (Elf_External_Verdef);
3093 size += sizeof (Elf_External_Verdaux);
3096 for (t = verdefs; t != NULL; t = t->next)
3098 struct bfd_elf_version_deps *n;
3100 size += sizeof (Elf_External_Verdef);
3101 size += sizeof (Elf_External_Verdaux);
3104 for (n = t->deps; n != NULL; n = n->next)
3105 size += sizeof (Elf_External_Verdaux);
3108 s->_raw_size = size;
3109 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3110 if (s->contents == NULL && s->_raw_size != 0)
3113 /* Fill in the version definition section. */
3117 def.vd_version = VER_DEF_CURRENT;
3118 def.vd_flags = VER_FLG_BASE;
3121 def.vd_aux = sizeof (Elf_External_Verdef);
3122 def.vd_next = (sizeof (Elf_External_Verdef)
3123 + sizeof (Elf_External_Verdaux));
3125 if (soname_indx != (bfd_size_type) -1)
3127 def.vd_hash = bfd_elf_hash (soname);
3128 defaux.vda_name = soname_indx;
3135 name = basename (output_bfd->filename);
3136 def.vd_hash = bfd_elf_hash (name);
3137 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3139 if (indx == (bfd_size_type) -1)
3141 defaux.vda_name = indx;
3143 defaux.vda_next = 0;
3145 _bfd_elf_swap_verdef_out (output_bfd, &def,
3146 (Elf_External_Verdef *)p);
3147 p += sizeof (Elf_External_Verdef);
3148 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3149 (Elf_External_Verdaux *) p);
3150 p += sizeof (Elf_External_Verdaux);
3152 for (t = verdefs; t != NULL; t = t->next)
3155 struct bfd_elf_version_deps *n;
3156 struct elf_link_hash_entry *h;
3159 for (n = t->deps; n != NULL; n = n->next)
3162 /* Add a symbol representing this version. */
3164 if (! (_bfd_generic_link_add_one_symbol
3165 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3166 (bfd_vma) 0, (const char *) NULL, false,
3167 get_elf_backend_data (dynobj)->collect,
3168 (struct bfd_link_hash_entry **) &h)))
3170 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3171 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3172 h->type = STT_OBJECT;
3173 h->verinfo.vertree = t;
3175 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3178 def.vd_version = VER_DEF_CURRENT;
3180 if (t->globals == NULL && t->locals == NULL && ! t->used)
3181 def.vd_flags |= VER_FLG_WEAK;
3182 def.vd_ndx = t->vernum + 1;
3183 def.vd_cnt = cdeps + 1;
3184 def.vd_hash = bfd_elf_hash (t->name);
3185 def.vd_aux = sizeof (Elf_External_Verdef);
3186 if (t->next != NULL)
3187 def.vd_next = (sizeof (Elf_External_Verdef)
3188 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3192 _bfd_elf_swap_verdef_out (output_bfd, &def,
3193 (Elf_External_Verdef *) p);
3194 p += sizeof (Elf_External_Verdef);
3196 defaux.vda_name = h->dynstr_index;
3197 if (t->deps == NULL)
3198 defaux.vda_next = 0;
3200 defaux.vda_next = sizeof (Elf_External_Verdaux);
3201 t->name_indx = defaux.vda_name;
3203 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3204 (Elf_External_Verdaux *) p);
3205 p += sizeof (Elf_External_Verdaux);
3207 for (n = t->deps; n != NULL; n = n->next)
3209 if (n->version_needed == NULL)
3211 /* This can happen if there was an error in the
3213 defaux.vda_name = 0;
3216 defaux.vda_name = n->version_needed->name_indx;
3217 if (n->next == NULL)
3218 defaux.vda_next = 0;
3220 defaux.vda_next = sizeof (Elf_External_Verdaux);
3222 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3223 (Elf_External_Verdaux *) p);
3224 p += sizeof (Elf_External_Verdaux);
3228 if (! elf_add_dynamic_entry (info, DT_VERDEF, 0)
3229 || ! elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
3232 elf_tdata (output_bfd)->cverdefs = cdefs;
3235 if (info->new_dtags && info->flags)
3237 if (! elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
3244 info->flags_1 &= ~ (DF_1_INITFIRST
3247 if (! elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
3251 /* Work out the size of the version reference section. */
3253 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3254 BFD_ASSERT (s != NULL);
3256 struct elf_find_verdep_info sinfo;
3258 sinfo.output_bfd = output_bfd;
3260 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3261 if (sinfo.vers == 0)
3263 sinfo.failed = false;
3265 elf_link_hash_traverse (elf_hash_table (info),
3266 elf_link_find_version_dependencies,
3269 if (elf_tdata (output_bfd)->verref == NULL)
3270 _bfd_strip_section_from_output (info, s);
3273 Elf_Internal_Verneed *t;
3278 /* Build the version definition section. */
3281 for (t = elf_tdata (output_bfd)->verref;
3285 Elf_Internal_Vernaux *a;
3287 size += sizeof (Elf_External_Verneed);
3289 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3290 size += sizeof (Elf_External_Vernaux);
3293 s->_raw_size = size;
3294 s->contents = (bfd_byte *) bfd_alloc (output_bfd, size);
3295 if (s->contents == NULL)
3299 for (t = elf_tdata (output_bfd)->verref;
3304 Elf_Internal_Vernaux *a;
3308 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3311 t->vn_version = VER_NEED_CURRENT;
3313 if (elf_dt_name (t->vn_bfd) != NULL)
3314 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3315 elf_dt_name (t->vn_bfd),
3318 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3319 basename (t->vn_bfd->filename),
3321 if (indx == (bfd_size_type) -1)
3324 t->vn_aux = sizeof (Elf_External_Verneed);
3325 if (t->vn_nextref == NULL)
3328 t->vn_next = (sizeof (Elf_External_Verneed)
3329 + caux * sizeof (Elf_External_Vernaux));
3331 _bfd_elf_swap_verneed_out (output_bfd, t,
3332 (Elf_External_Verneed *) p);
3333 p += sizeof (Elf_External_Verneed);
3335 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3337 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3338 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3339 a->vna_nodename, true, false);
3340 if (indx == (bfd_size_type) -1)
3343 if (a->vna_nextptr == NULL)
3346 a->vna_next = sizeof (Elf_External_Vernaux);
3348 _bfd_elf_swap_vernaux_out (output_bfd, a,
3349 (Elf_External_Vernaux *) p);
3350 p += sizeof (Elf_External_Vernaux);
3354 if (! elf_add_dynamic_entry (info, DT_VERNEED, 0)
3355 || ! elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
3358 elf_tdata (output_bfd)->cverrefs = crefs;
3362 /* Assign dynsym indicies. In a shared library we generate a
3363 section symbol for each output section, which come first.
3364 Next come all of the back-end allocated local dynamic syms,
3365 followed by the rest of the global symbols. */
3367 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3369 /* Work out the size of the symbol version section. */
3370 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3371 BFD_ASSERT (s != NULL);
3372 if (dynsymcount == 0
3373 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3375 _bfd_strip_section_from_output (info, s);
3376 /* The DYNSYMCOUNT might have changed if we were going to
3377 output a dynamic symbol table entry for S. */
3378 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3382 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3383 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3384 if (s->contents == NULL)
3387 if (! elf_add_dynamic_entry (info, DT_VERSYM, 0))
3391 /* Set the size of the .dynsym and .hash sections. We counted
3392 the number of dynamic symbols in elf_link_add_object_symbols.
3393 We will build the contents of .dynsym and .hash when we build
3394 the final symbol table, because until then we do not know the
3395 correct value to give the symbols. We built the .dynstr
3396 section as we went along in elf_link_add_object_symbols. */
3397 s = bfd_get_section_by_name (dynobj, ".dynsym");
3398 BFD_ASSERT (s != NULL);
3399 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3400 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3401 if (s->contents == NULL && s->_raw_size != 0)
3404 if (dynsymcount != 0)
3406 Elf_Internal_Sym isym;
3408 /* The first entry in .dynsym is a dummy symbol. */
3415 elf_swap_symbol_out (output_bfd, &isym,
3416 (PTR) (Elf_External_Sym *) s->contents);
3419 /* Compute the size of the hashing table. As a side effect this
3420 computes the hash values for all the names we export. */
3421 bucketcount = compute_bucket_count (info);
3423 s = bfd_get_section_by_name (dynobj, ".hash");
3424 BFD_ASSERT (s != NULL);
3425 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3426 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3427 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3428 if (s->contents == NULL)
3430 memset (s->contents, 0, (size_t) s->_raw_size);
3432 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
3433 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
3434 s->contents + hash_entry_size);
3436 elf_hash_table (info)->bucketcount = bucketcount;
3438 s = bfd_get_section_by_name (dynobj, ".dynstr");
3439 BFD_ASSERT (s != NULL);
3440 s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3442 if (! elf_add_dynamic_entry (info, DT_NULL, 0))
3449 /* Fix up the flags for a symbol. This handles various cases which
3450 can only be fixed after all the input files are seen. This is
3451 currently called by both adjust_dynamic_symbol and
3452 assign_sym_version, which is unnecessary but perhaps more robust in
3453 the face of future changes. */
3456 elf_fix_symbol_flags (h, eif)
3457 struct elf_link_hash_entry *h;
3458 struct elf_info_failed *eif;
3460 /* If this symbol was mentioned in a non-ELF file, try to set
3461 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3462 permit a non-ELF file to correctly refer to a symbol defined in
3463 an ELF dynamic object. */
3464 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3466 while (h->root.type == bfd_link_hash_indirect)
3467 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3469 if (h->root.type != bfd_link_hash_defined
3470 && h->root.type != bfd_link_hash_defweak)
3471 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3472 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3475 if (h->root.u.def.section->owner != NULL
3476 && (bfd_get_flavour (h->root.u.def.section->owner)
3477 == bfd_target_elf_flavour))
3478 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3479 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3481 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3484 if (h->dynindx == -1
3485 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3486 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3488 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3497 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3498 was first seen in a non-ELF file. Fortunately, if the symbol
3499 was first seen in an ELF file, we're probably OK unless the
3500 symbol was defined in a non-ELF file. Catch that case here.
3501 FIXME: We're still in trouble if the symbol was first seen in
3502 a dynamic object, and then later in a non-ELF regular object. */
3503 if ((h->root.type == bfd_link_hash_defined
3504 || h->root.type == bfd_link_hash_defweak)
3505 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3506 && (h->root.u.def.section->owner != NULL
3507 ? (bfd_get_flavour (h->root.u.def.section->owner)
3508 != bfd_target_elf_flavour)
3509 : (bfd_is_abs_section (h->root.u.def.section)
3510 && (h->elf_link_hash_flags
3511 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3512 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3515 /* If this is a final link, and the symbol was defined as a common
3516 symbol in a regular object file, and there was no definition in
3517 any dynamic object, then the linker will have allocated space for
3518 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3519 flag will not have been set. */
3520 if (h->root.type == bfd_link_hash_defined
3521 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3522 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3523 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3524 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3525 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3527 /* If -Bsymbolic was used (which means to bind references to global
3528 symbols to the definition within the shared object), and this
3529 symbol was defined in a regular object, then it actually doesn't
3530 need a PLT entry, and we can accomplish that by forcing it local.
3531 Likewise, if the symbol has hidden or internal visibility.
3532 FIXME: It might be that we also do not need a PLT for other
3533 non-hidden visibilities, but we would have to tell that to the
3534 backend specifically; we can't just clear PLT-related data here. */
3535 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3536 && eif->info->shared
3537 && (eif->info->symbolic
3538 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3539 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3540 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3542 struct elf_backend_data *bed;
3543 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3544 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3545 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3546 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3547 (*bed->elf_backend_hide_symbol) (eif->info, h);
3550 /* If this is a weak defined symbol in a dynamic object, and we know
3551 the real definition in the dynamic object, copy interesting flags
3552 over to the real definition. */
3553 if (h->weakdef != NULL)
3555 struct elf_link_hash_entry *weakdef;
3557 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3558 || h->root.type == bfd_link_hash_defweak);
3559 weakdef = h->weakdef;
3560 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3561 || weakdef->root.type == bfd_link_hash_defweak);
3562 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3564 /* If the real definition is defined by a regular object file,
3565 don't do anything special. See the longer description in
3566 elf_adjust_dynamic_symbol, below. */
3567 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3570 weakdef->elf_link_hash_flags |=
3571 (h->elf_link_hash_flags
3572 & (ELF_LINK_HASH_REF_REGULAR
3573 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3574 | ELF_LINK_NON_GOT_REF));
3580 /* Make the backend pick a good value for a dynamic symbol. This is
3581 called via elf_link_hash_traverse, and also calls itself
3585 elf_adjust_dynamic_symbol (h, data)
3586 struct elf_link_hash_entry *h;
3589 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3591 struct elf_backend_data *bed;
3593 /* Ignore indirect symbols. These are added by the versioning code. */
3594 if (h->root.type == bfd_link_hash_indirect)
3597 /* Fix the symbol flags. */
3598 if (! elf_fix_symbol_flags (h, eif))
3601 /* If this symbol does not require a PLT entry, and it is not
3602 defined by a dynamic object, or is not referenced by a regular
3603 object, ignore it. We do have to handle a weak defined symbol,
3604 even if no regular object refers to it, if we decided to add it
3605 to the dynamic symbol table. FIXME: Do we normally need to worry
3606 about symbols which are defined by one dynamic object and
3607 referenced by another one? */
3608 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
3609 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3610 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3611 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
3612 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
3614 h->plt.offset = (bfd_vma) -1;
3618 /* If we've already adjusted this symbol, don't do it again. This
3619 can happen via a recursive call. */
3620 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
3623 /* Don't look at this symbol again. Note that we must set this
3624 after checking the above conditions, because we may look at a
3625 symbol once, decide not to do anything, and then get called
3626 recursively later after REF_REGULAR is set below. */
3627 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
3629 /* If this is a weak definition, and we know a real definition, and
3630 the real symbol is not itself defined by a regular object file,
3631 then get a good value for the real definition. We handle the
3632 real symbol first, for the convenience of the backend routine.
3634 Note that there is a confusing case here. If the real definition
3635 is defined by a regular object file, we don't get the real symbol
3636 from the dynamic object, but we do get the weak symbol. If the
3637 processor backend uses a COPY reloc, then if some routine in the
3638 dynamic object changes the real symbol, we will not see that
3639 change in the corresponding weak symbol. This is the way other
3640 ELF linkers work as well, and seems to be a result of the shared
3643 I will clarify this issue. Most SVR4 shared libraries define the
3644 variable _timezone and define timezone as a weak synonym. The
3645 tzset call changes _timezone. If you write
3646 extern int timezone;
3648 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3649 you might expect that, since timezone is a synonym for _timezone,
3650 the same number will print both times. However, if the processor
3651 backend uses a COPY reloc, then actually timezone will be copied
3652 into your process image, and, since you define _timezone
3653 yourself, _timezone will not. Thus timezone and _timezone will
3654 wind up at different memory locations. The tzset call will set
3655 _timezone, leaving timezone unchanged. */
3657 if (h->weakdef != NULL)
3659 /* If we get to this point, we know there is an implicit
3660 reference by a regular object file via the weak symbol H.
3661 FIXME: Is this really true? What if the traversal finds
3662 H->WEAKDEF before it finds H? */
3663 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
3665 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
3669 /* If a symbol has no type and no size and does not require a PLT
3670 entry, then we are probably about to do the wrong thing here: we
3671 are probably going to create a COPY reloc for an empty object.
3672 This case can arise when a shared object is built with assembly
3673 code, and the assembly code fails to set the symbol type. */
3675 && h->type == STT_NOTYPE
3676 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
3677 (*_bfd_error_handler)
3678 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3679 h->root.root.string);
3681 dynobj = elf_hash_table (eif->info)->dynobj;
3682 bed = get_elf_backend_data (dynobj);
3683 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
3692 /* This routine is used to export all defined symbols into the dynamic
3693 symbol table. It is called via elf_link_hash_traverse. */
3696 elf_export_symbol (h, data)
3697 struct elf_link_hash_entry *h;
3700 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3702 /* Ignore indirect symbols. These are added by the versioning code. */
3703 if (h->root.type == bfd_link_hash_indirect)
3706 if (h->dynindx == -1
3707 && (h->elf_link_hash_flags
3708 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
3710 struct bfd_elf_version_tree *t;
3711 struct bfd_elf_version_expr *d;
3713 for (t = eif->verdefs; t != NULL; t = t->next)
3715 if (t->globals != NULL)
3717 for (d = t->globals; d != NULL; d = d->next)
3719 if ((*d->match) (d, h->root.root.string))
3724 if (t->locals != NULL)
3726 for (d = t->locals ; d != NULL; d = d->next)
3728 if ((*d->match) (d, h->root.root.string))
3737 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3748 /* Look through the symbols which are defined in other shared
3749 libraries and referenced here. Update the list of version
3750 dependencies. This will be put into the .gnu.version_r section.
3751 This function is called via elf_link_hash_traverse. */
3754 elf_link_find_version_dependencies (h, data)
3755 struct elf_link_hash_entry *h;
3758 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
3759 Elf_Internal_Verneed *t;
3760 Elf_Internal_Vernaux *a;
3762 /* We only care about symbols defined in shared objects with version
3764 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3765 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3767 || h->verinfo.verdef == NULL)
3770 /* See if we already know about this version. */
3771 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
3773 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
3776 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3777 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
3783 /* This is a new version. Add it to tree we are building. */
3787 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, sizeof *t);
3790 rinfo->failed = true;
3794 t->vn_bfd = h->verinfo.verdef->vd_bfd;
3795 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
3796 elf_tdata (rinfo->output_bfd)->verref = t;
3799 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, sizeof *a);
3801 /* Note that we are copying a string pointer here, and testing it
3802 above. If bfd_elf_string_from_elf_section is ever changed to
3803 discard the string data when low in memory, this will have to be
3805 a->vna_nodename = h->verinfo.verdef->vd_nodename;
3807 a->vna_flags = h->verinfo.verdef->vd_flags;
3808 a->vna_nextptr = t->vn_auxptr;
3810 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
3813 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
3820 /* Figure out appropriate versions for all the symbols. We may not
3821 have the version number script until we have read all of the input
3822 files, so until that point we don't know which symbols should be
3823 local. This function is called via elf_link_hash_traverse. */
3826 elf_link_assign_sym_version (h, data)
3827 struct elf_link_hash_entry *h;
3830 struct elf_assign_sym_version_info *sinfo =
3831 (struct elf_assign_sym_version_info *) data;
3832 struct bfd_link_info *info = sinfo->info;
3833 struct elf_backend_data *bed;
3834 struct elf_info_failed eif;
3837 /* Fix the symbol flags. */
3840 if (! elf_fix_symbol_flags (h, &eif))
3843 sinfo->failed = true;
3847 /* We only need version numbers for symbols defined in regular
3849 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3852 bed = get_elf_backend_data (sinfo->output_bfd);
3853 p = strchr (h->root.root.string, ELF_VER_CHR);
3854 if (p != NULL && h->verinfo.vertree == NULL)
3856 struct bfd_elf_version_tree *t;
3861 /* There are two consecutive ELF_VER_CHR characters if this is
3862 not a hidden symbol. */
3864 if (*p == ELF_VER_CHR)
3870 /* If there is no version string, we can just return out. */
3874 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3878 /* Look for the version. If we find it, it is no longer weak. */
3879 for (t = sinfo->verdefs; t != NULL; t = t->next)
3881 if (strcmp (t->name, p) == 0)
3885 struct bfd_elf_version_expr *d;
3887 len = p - h->root.root.string;
3888 alc = bfd_alloc (sinfo->output_bfd, len);
3891 strncpy (alc, h->root.root.string, len - 1);
3892 alc[len - 1] = '\0';
3893 if (alc[len - 2] == ELF_VER_CHR)
3894 alc[len - 2] = '\0';
3896 h->verinfo.vertree = t;
3900 if (t->globals != NULL)
3902 for (d = t->globals; d != NULL; d = d->next)
3903 if ((*d->match) (d, alc))
3907 /* See if there is anything to force this symbol to
3909 if (d == NULL && t->locals != NULL)
3911 for (d = t->locals; d != NULL; d = d->next)
3913 if ((*d->match) (d, alc))
3915 if (h->dynindx != -1
3917 && ! sinfo->export_dynamic)
3919 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3920 (*bed->elf_backend_hide_symbol) (info, h);
3921 /* FIXME: The name of the symbol has
3922 already been recorded in the dynamic
3923 string table section. */
3931 bfd_release (sinfo->output_bfd, alc);
3936 /* If we are building an application, we need to create a
3937 version node for this version. */
3938 if (t == NULL && ! info->shared)
3940 struct bfd_elf_version_tree **pp;
3943 /* If we aren't going to export this symbol, we don't need
3944 to worry about it. */
3945 if (h->dynindx == -1)
3948 t = ((struct bfd_elf_version_tree *)
3949 bfd_alloc (sinfo->output_bfd, sizeof *t));
3952 sinfo->failed = true;
3961 t->name_indx = (unsigned int) -1;
3965 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
3967 t->vernum = version_index;
3971 h->verinfo.vertree = t;
3975 /* We could not find the version for a symbol when
3976 generating a shared archive. Return an error. */
3977 (*_bfd_error_handler)
3978 (_("%s: undefined versioned symbol name %s"),
3979 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
3980 bfd_set_error (bfd_error_bad_value);
3981 sinfo->failed = true;
3986 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3989 /* If we don't have a version for this symbol, see if we can find
3991 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
3993 struct bfd_elf_version_tree *t;
3994 struct bfd_elf_version_tree *deflt;
3995 struct bfd_elf_version_expr *d;
3997 /* See if can find what version this symbol is in. If the
3998 symbol is supposed to be local, then don't actually register
4001 for (t = sinfo->verdefs; t != NULL; t = t->next)
4003 if (t->globals != NULL)
4005 for (d = t->globals; d != NULL; d = d->next)
4007 if ((*d->match) (d, h->root.root.string))
4009 h->verinfo.vertree = t;
4018 if (t->locals != NULL)
4020 for (d = t->locals; d != NULL; d = d->next)
4022 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
4024 else if ((*d->match) (d, h->root.root.string))
4026 h->verinfo.vertree = t;
4027 if (h->dynindx != -1
4029 && ! sinfo->export_dynamic)
4031 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
4032 (*bed->elf_backend_hide_symbol) (info, h);
4033 /* FIXME: The name of the symbol has already
4034 been recorded in the dynamic string table
4046 if (deflt != NULL && h->verinfo.vertree == NULL)
4048 h->verinfo.vertree = deflt;
4049 if (h->dynindx != -1
4051 && ! sinfo->export_dynamic)
4053 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
4054 (*bed->elf_backend_hide_symbol) (info, h);
4055 /* FIXME: The name of the symbol has already been
4056 recorded in the dynamic string table section. */
4064 /* Final phase of ELF linker. */
4066 /* A structure we use to avoid passing large numbers of arguments. */
4068 struct elf_final_link_info
4070 /* General link information. */
4071 struct bfd_link_info *info;
4074 /* Symbol string table. */
4075 struct bfd_strtab_hash *symstrtab;
4076 /* .dynsym section. */
4077 asection *dynsym_sec;
4078 /* .hash section. */
4080 /* symbol version section (.gnu.version). */
4081 asection *symver_sec;
4082 /* Buffer large enough to hold contents of any section. */
4084 /* Buffer large enough to hold external relocs of any section. */
4085 PTR external_relocs;
4086 /* Buffer large enough to hold internal relocs of any section. */
4087 Elf_Internal_Rela *internal_relocs;
4088 /* Buffer large enough to hold external local symbols of any input
4090 Elf_External_Sym *external_syms;
4091 /* Buffer large enough to hold internal local symbols of any input
4093 Elf_Internal_Sym *internal_syms;
4094 /* Array large enough to hold a symbol index for each local symbol
4095 of any input BFD. */
4097 /* Array large enough to hold a section pointer for each local
4098 symbol of any input BFD. */
4099 asection **sections;
4100 /* Buffer to hold swapped out symbols. */
4101 Elf_External_Sym *symbuf;
4102 /* Number of swapped out symbols in buffer. */
4103 size_t symbuf_count;
4104 /* Number of symbols which fit in symbuf. */
4108 static boolean elf_link_output_sym
4109 PARAMS ((struct elf_final_link_info *, const char *,
4110 Elf_Internal_Sym *, asection *));
4111 static boolean elf_link_flush_output_syms
4112 PARAMS ((struct elf_final_link_info *));
4113 static boolean elf_link_output_extsym
4114 PARAMS ((struct elf_link_hash_entry *, PTR));
4115 static boolean elf_link_sec_merge_syms
4116 PARAMS ((struct elf_link_hash_entry *, PTR));
4117 static boolean elf_link_input_bfd
4118 PARAMS ((struct elf_final_link_info *, bfd *));
4119 static boolean elf_reloc_link_order
4120 PARAMS ((bfd *, struct bfd_link_info *, asection *,
4121 struct bfd_link_order *));
4123 /* This struct is used to pass information to elf_link_output_extsym. */
4125 struct elf_outext_info
4129 struct elf_final_link_info *finfo;
4132 /* Compute the size of, and allocate space for, REL_HDR which is the
4133 section header for a section containing relocations for O. */
4136 elf_link_size_reloc_section (abfd, rel_hdr, o)
4138 Elf_Internal_Shdr *rel_hdr;
4141 unsigned reloc_count;
4143 /* Figure out how many relocations there will be. */
4144 if (rel_hdr == &elf_section_data (o)->rel_hdr)
4145 reloc_count = elf_section_data (o)->rel_count;
4147 reloc_count = elf_section_data (o)->rel_count2;
4149 /* That allows us to calculate the size of the section. */
4150 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4152 /* The contents field must last into write_object_contents, so we
4153 allocate it with bfd_alloc rather than malloc. Also since we
4154 cannot be sure that the contents will actually be filled in,
4155 we zero the allocated space. */
4156 rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4157 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4160 /* We only allocate one set of hash entries, so we only do it the
4161 first time we are called. */
4162 if (elf_section_data (o)->rel_hashes == NULL)
4164 struct elf_link_hash_entry **p;
4166 p = ((struct elf_link_hash_entry **)
4167 bfd_zmalloc (o->reloc_count
4168 * sizeof (struct elf_link_hash_entry *)));
4169 if (p == NULL && o->reloc_count != 0)
4172 elf_section_data (o)->rel_hashes = p;
4178 /* When performing a relocateable link, the input relocations are
4179 preserved. But, if they reference global symbols, the indices
4180 referenced must be updated. Update all the relocations in
4181 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4184 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4186 Elf_Internal_Shdr *rel_hdr;
4188 struct elf_link_hash_entry **rel_hash;
4191 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4192 Elf_Internal_Rel *irel;
4193 Elf_Internal_Rela *irela;
4195 irel = (Elf_Internal_Rel *) bfd_zmalloc (sizeof (Elf_Internal_Rel)
4196 * bed->s->int_rels_per_ext_rel);
4199 (*_bfd_error_handler) (_("Error: out of memory"));
4203 irela = (Elf_Internal_Rela *) bfd_zmalloc (sizeof (Elf_Internal_Rela)
4204 * bed->s->int_rels_per_ext_rel);
4207 (*_bfd_error_handler) (_("Error: out of memory"));
4211 for (i = 0; i < count; i++, rel_hash++)
4213 if (*rel_hash == NULL)
4216 BFD_ASSERT ((*rel_hash)->indx >= 0);
4218 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4220 Elf_External_Rel *erel;
4223 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4224 if (bed->s->swap_reloc_in)
4225 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
4227 elf_swap_reloc_in (abfd, erel, irel);
4229 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4230 irel[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4231 ELF_R_TYPE (irel[j].r_info));
4233 if (bed->s->swap_reloc_out)
4234 (*bed->s->swap_reloc_out) (abfd, irel, (bfd_byte *) erel);
4236 elf_swap_reloc_out (abfd, irel, erel);
4240 Elf_External_Rela *erela;
4243 BFD_ASSERT (rel_hdr->sh_entsize
4244 == sizeof (Elf_External_Rela));
4246 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4247 if (bed->s->swap_reloca_in)
4248 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
4250 elf_swap_reloca_in (abfd, erela, irela);
4252 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4253 irela[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4254 ELF_R_TYPE (irela[j].r_info));
4256 if (bed->s->swap_reloca_out)
4257 (*bed->s->swap_reloca_out) (abfd, irela, (bfd_byte *) erela);
4259 elf_swap_reloca_out (abfd, irela, erela);
4267 /* Do the final step of an ELF link. */
4270 elf_bfd_final_link (abfd, info)
4272 struct bfd_link_info *info;
4276 struct elf_final_link_info finfo;
4277 register asection *o;
4278 register struct bfd_link_order *p;
4280 size_t max_contents_size;
4281 size_t max_external_reloc_size;
4282 size_t max_internal_reloc_count;
4283 size_t max_sym_count;
4285 Elf_Internal_Sym elfsym;
4287 Elf_Internal_Shdr *symtab_hdr;
4288 Elf_Internal_Shdr *symstrtab_hdr;
4289 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4290 struct elf_outext_info eoinfo;
4294 abfd->flags |= DYNAMIC;
4296 dynamic = elf_hash_table (info)->dynamic_sections_created;
4297 dynobj = elf_hash_table (info)->dynobj;
4300 finfo.output_bfd = abfd;
4301 finfo.symstrtab = elf_stringtab_init ();
4302 if (finfo.symstrtab == NULL)
4307 finfo.dynsym_sec = NULL;
4308 finfo.hash_sec = NULL;
4309 finfo.symver_sec = NULL;
4313 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4314 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4315 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4316 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4317 /* Note that it is OK if symver_sec is NULL. */
4320 finfo.contents = NULL;
4321 finfo.external_relocs = NULL;
4322 finfo.internal_relocs = NULL;
4323 finfo.external_syms = NULL;
4324 finfo.internal_syms = NULL;
4325 finfo.indices = NULL;
4326 finfo.sections = NULL;
4327 finfo.symbuf = NULL;
4328 finfo.symbuf_count = 0;
4330 /* Count up the number of relocations we will output for each output
4331 section, so that we know the sizes of the reloc sections. We
4332 also figure out some maximum sizes. */
4333 max_contents_size = 0;
4334 max_external_reloc_size = 0;
4335 max_internal_reloc_count = 0;
4338 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4342 for (p = o->link_order_head; p != NULL; p = p->next)
4344 if (p->type == bfd_section_reloc_link_order
4345 || p->type == bfd_symbol_reloc_link_order)
4347 else if (p->type == bfd_indirect_link_order)
4351 sec = p->u.indirect.section;
4353 /* Mark all sections which are to be included in the
4354 link. This will normally be every section. We need
4355 to do this so that we can identify any sections which
4356 the linker has decided to not include. */
4357 sec->linker_mark = true;
4359 if (sec->flags & SEC_MERGE)
4362 if (info->relocateable || info->emitrelocations)
4363 o->reloc_count += sec->reloc_count;
4365 if (sec->_raw_size > max_contents_size)
4366 max_contents_size = sec->_raw_size;
4367 if (sec->_cooked_size > max_contents_size)
4368 max_contents_size = sec->_cooked_size;
4370 /* We are interested in just local symbols, not all
4372 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
4373 && (sec->owner->flags & DYNAMIC) == 0)
4377 if (elf_bad_symtab (sec->owner))
4378 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
4379 / sizeof (Elf_External_Sym));
4381 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
4383 if (sym_count > max_sym_count)
4384 max_sym_count = sym_count;
4386 if ((sec->flags & SEC_RELOC) != 0)
4390 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
4391 if (ext_size > max_external_reloc_size)
4392 max_external_reloc_size = ext_size;
4393 if (sec->reloc_count > max_internal_reloc_count)
4394 max_internal_reloc_count = sec->reloc_count;
4400 if (o->reloc_count > 0)
4401 o->flags |= SEC_RELOC;
4404 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4405 set it (this is probably a bug) and if it is set
4406 assign_section_numbers will create a reloc section. */
4407 o->flags &=~ SEC_RELOC;
4410 /* If the SEC_ALLOC flag is not set, force the section VMA to
4411 zero. This is done in elf_fake_sections as well, but forcing
4412 the VMA to 0 here will ensure that relocs against these
4413 sections are handled correctly. */
4414 if ((o->flags & SEC_ALLOC) == 0
4415 && ! o->user_set_vma)
4419 if (! info->relocateable && merged)
4420 elf_link_hash_traverse (elf_hash_table (info),
4421 elf_link_sec_merge_syms, (PTR) abfd);
4423 /* Figure out the file positions for everything but the symbol table
4424 and the relocs. We set symcount to force assign_section_numbers
4425 to create a symbol table. */
4426 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
4427 BFD_ASSERT (! abfd->output_has_begun);
4428 if (! _bfd_elf_compute_section_file_positions (abfd, info))
4431 /* Figure out how many relocations we will have in each section.
4432 Just using RELOC_COUNT isn't good enough since that doesn't
4433 maintain a separate value for REL vs. RELA relocations. */
4434 if (info->relocateable || info->emitrelocations)
4435 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4436 for (o = sub->sections; o != NULL; o = o->next)
4438 asection *output_section;
4440 if (! o->linker_mark)
4442 /* This section was omitted from the link. */
4446 output_section = o->output_section;
4448 if (output_section != NULL
4449 && (o->flags & SEC_RELOC) != 0)
4451 struct bfd_elf_section_data *esdi
4452 = elf_section_data (o);
4453 struct bfd_elf_section_data *esdo
4454 = elf_section_data (output_section);
4455 unsigned int *rel_count;
4456 unsigned int *rel_count2;
4458 /* We must be careful to add the relocation froms the
4459 input section to the right output count. */
4460 if (esdi->rel_hdr.sh_entsize == esdo->rel_hdr.sh_entsize)
4462 rel_count = &esdo->rel_count;
4463 rel_count2 = &esdo->rel_count2;
4467 rel_count = &esdo->rel_count2;
4468 rel_count2 = &esdo->rel_count;
4471 *rel_count += NUM_SHDR_ENTRIES (& esdi->rel_hdr);
4473 *rel_count2 += NUM_SHDR_ENTRIES (esdi->rel_hdr2);
4477 /* That created the reloc sections. Set their sizes, and assign
4478 them file positions, and allocate some buffers. */
4479 for (o = abfd->sections; o != NULL; o = o->next)
4481 if ((o->flags & SEC_RELOC) != 0)
4483 if (!elf_link_size_reloc_section (abfd,
4484 &elf_section_data (o)->rel_hdr,
4488 if (elf_section_data (o)->rel_hdr2
4489 && !elf_link_size_reloc_section (abfd,
4490 elf_section_data (o)->rel_hdr2,
4495 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4496 to count upwards while actually outputting the relocations. */
4497 elf_section_data (o)->rel_count = 0;
4498 elf_section_data (o)->rel_count2 = 0;
4501 _bfd_elf_assign_file_positions_for_relocs (abfd);
4503 /* We have now assigned file positions for all the sections except
4504 .symtab and .strtab. We start the .symtab section at the current
4505 file position, and write directly to it. We build the .strtab
4506 section in memory. */
4507 bfd_get_symcount (abfd) = 0;
4508 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4509 /* sh_name is set in prep_headers. */
4510 symtab_hdr->sh_type = SHT_SYMTAB;
4511 symtab_hdr->sh_flags = 0;
4512 symtab_hdr->sh_addr = 0;
4513 symtab_hdr->sh_size = 0;
4514 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
4515 /* sh_link is set in assign_section_numbers. */
4516 /* sh_info is set below. */
4517 /* sh_offset is set just below. */
4518 symtab_hdr->sh_addralign = bed->s->file_align;
4520 off = elf_tdata (abfd)->next_file_pos;
4521 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
4523 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4524 incorrect. We do not yet know the size of the .symtab section.
4525 We correct next_file_pos below, after we do know the size. */
4527 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4528 continuously seeking to the right position in the file. */
4529 if (! info->keep_memory || max_sym_count < 20)
4530 finfo.symbuf_size = 20;
4532 finfo.symbuf_size = max_sym_count;
4533 finfo.symbuf = ((Elf_External_Sym *)
4534 bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
4535 if (finfo.symbuf == NULL)
4538 /* Start writing out the symbol table. The first symbol is always a
4540 if (info->strip != strip_all || info->relocateable || info->emitrelocations)
4542 elfsym.st_value = 0;
4545 elfsym.st_other = 0;
4546 elfsym.st_shndx = SHN_UNDEF;
4547 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4548 &elfsym, bfd_und_section_ptr))
4553 /* Some standard ELF linkers do this, but we don't because it causes
4554 bootstrap comparison failures. */
4555 /* Output a file symbol for the output file as the second symbol.
4556 We output this even if we are discarding local symbols, although
4557 I'm not sure if this is correct. */
4558 elfsym.st_value = 0;
4560 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
4561 elfsym.st_other = 0;
4562 elfsym.st_shndx = SHN_ABS;
4563 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
4564 &elfsym, bfd_abs_section_ptr))
4568 /* Output a symbol for each section. We output these even if we are
4569 discarding local symbols, since they are used for relocs. These
4570 symbols have no names. We store the index of each one in the
4571 index field of the section, so that we can find it again when
4572 outputting relocs. */
4573 if (info->strip != strip_all || info->relocateable || info->emitrelocations)
4576 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4577 elfsym.st_other = 0;
4578 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4580 o = section_from_elf_index (abfd, i);
4582 o->target_index = bfd_get_symcount (abfd);
4583 elfsym.st_shndx = i;
4584 if (info->relocateable || o == NULL)
4585 elfsym.st_value = 0;
4587 elfsym.st_value = o->vma;
4588 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4594 /* Allocate some memory to hold information read in from the input
4596 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
4597 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
4598 finfo.internal_relocs = ((Elf_Internal_Rela *)
4599 bfd_malloc (max_internal_reloc_count
4600 * sizeof (Elf_Internal_Rela)
4601 * bed->s->int_rels_per_ext_rel));
4602 finfo.external_syms = ((Elf_External_Sym *)
4603 bfd_malloc (max_sym_count
4604 * sizeof (Elf_External_Sym)));
4605 finfo.internal_syms = ((Elf_Internal_Sym *)
4606 bfd_malloc (max_sym_count
4607 * sizeof (Elf_Internal_Sym)));
4608 finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
4609 finfo.sections = ((asection **)
4610 bfd_malloc (max_sym_count * sizeof (asection *)));
4611 if ((finfo.contents == NULL && max_contents_size != 0)
4612 || (finfo.external_relocs == NULL && max_external_reloc_size != 0)
4613 || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
4614 || (finfo.external_syms == NULL && max_sym_count != 0)
4615 || (finfo.internal_syms == NULL && max_sym_count != 0)
4616 || (finfo.indices == NULL && max_sym_count != 0)
4617 || (finfo.sections == NULL && max_sym_count != 0))
4620 /* Since ELF permits relocations to be against local symbols, we
4621 must have the local symbols available when we do the relocations.
4622 Since we would rather only read the local symbols once, and we
4623 would rather not keep them in memory, we handle all the
4624 relocations for a single input file at the same time.
4626 Unfortunately, there is no way to know the total number of local
4627 symbols until we have seen all of them, and the local symbol
4628 indices precede the global symbol indices. This means that when
4629 we are generating relocateable output, and we see a reloc against
4630 a global symbol, we can not know the symbol index until we have
4631 finished examining all the local symbols to see which ones we are
4632 going to output. To deal with this, we keep the relocations in
4633 memory, and don't output them until the end of the link. This is
4634 an unfortunate waste of memory, but I don't see a good way around
4635 it. Fortunately, it only happens when performing a relocateable
4636 link, which is not the common case. FIXME: If keep_memory is set
4637 we could write the relocs out and then read them again; I don't
4638 know how bad the memory loss will be. */
4640 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4641 sub->output_has_begun = false;
4642 for (o = abfd->sections; o != NULL; o = o->next)
4644 for (p = o->link_order_head; p != NULL; p = p->next)
4646 if (p->type == bfd_indirect_link_order
4647 && (bfd_get_flavour (p->u.indirect.section->owner)
4648 == bfd_target_elf_flavour))
4650 sub = p->u.indirect.section->owner;
4651 if (! sub->output_has_begun)
4653 if (! elf_link_input_bfd (&finfo, sub))
4655 sub->output_has_begun = true;
4658 else if (p->type == bfd_section_reloc_link_order
4659 || p->type == bfd_symbol_reloc_link_order)
4661 if (! elf_reloc_link_order (abfd, info, o, p))
4666 if (! _bfd_default_link_order (abfd, info, o, p))
4672 /* That wrote out all the local symbols. Finish up the symbol table
4673 with the global symbols. Even if we want to strip everything we
4674 can, we still need to deal with those global symbols that got
4675 converted to local in a version script. */
4679 /* Output any global symbols that got converted to local in a
4680 version script. We do this in a separate step since ELF
4681 requires all local symbols to appear prior to any global
4682 symbols. FIXME: We should only do this if some global
4683 symbols were, in fact, converted to become local. FIXME:
4684 Will this work correctly with the Irix 5 linker? */
4685 eoinfo.failed = false;
4686 eoinfo.finfo = &finfo;
4687 eoinfo.localsyms = true;
4688 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4694 /* The sh_info field records the index of the first non local symbol. */
4695 symtab_hdr->sh_info = bfd_get_symcount (abfd);
4698 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
4700 Elf_Internal_Sym sym;
4701 Elf_External_Sym *dynsym =
4702 (Elf_External_Sym *)finfo.dynsym_sec->contents;
4703 long last_local = 0;
4705 /* Write out the section symbols for the output sections. */
4712 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4715 for (s = abfd->sections; s != NULL; s = s->next)
4718 indx = elf_section_data (s)->this_idx;
4719 BFD_ASSERT (indx > 0);
4720 sym.st_shndx = indx;
4721 sym.st_value = s->vma;
4723 elf_swap_symbol_out (abfd, &sym,
4724 dynsym + elf_section_data (s)->dynindx);
4727 last_local = bfd_count_sections (abfd);
4730 /* Write out the local dynsyms. */
4731 if (elf_hash_table (info)->dynlocal)
4733 struct elf_link_local_dynamic_entry *e;
4734 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
4738 sym.st_size = e->isym.st_size;
4739 sym.st_other = e->isym.st_other;
4741 /* Copy the internal symbol as is.
4742 Note that we saved a word of storage and overwrote
4743 the original st_name with the dynstr_index. */
4746 if (e->isym.st_shndx > 0 && e->isym.st_shndx < SHN_LORESERVE)
4748 s = bfd_section_from_elf_index (e->input_bfd,
4752 elf_section_data (s->output_section)->this_idx;
4753 sym.st_value = (s->output_section->vma
4755 + e->isym.st_value);
4758 if (last_local < e->dynindx)
4759 last_local = e->dynindx;
4761 elf_swap_symbol_out (abfd, &sym, dynsym + e->dynindx);
4765 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
4769 /* We get the global symbols from the hash table. */
4770 eoinfo.failed = false;
4771 eoinfo.localsyms = false;
4772 eoinfo.finfo = &finfo;
4773 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4778 /* If backend needs to output some symbols not present in the hash
4779 table, do it now. */
4780 if (bed->elf_backend_output_arch_syms)
4782 if (! (*bed->elf_backend_output_arch_syms)
4783 (abfd, info, (PTR) &finfo,
4784 (boolean (*) PARAMS ((PTR, const char *,
4785 Elf_Internal_Sym *, asection *)))
4786 elf_link_output_sym))
4790 /* Flush all symbols to the file. */
4791 if (! elf_link_flush_output_syms (&finfo))
4794 /* Now we know the size of the symtab section. */
4795 off += symtab_hdr->sh_size;
4797 /* Finish up and write out the symbol string table (.strtab)
4799 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
4800 /* sh_name was set in prep_headers. */
4801 symstrtab_hdr->sh_type = SHT_STRTAB;
4802 symstrtab_hdr->sh_flags = 0;
4803 symstrtab_hdr->sh_addr = 0;
4804 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
4805 symstrtab_hdr->sh_entsize = 0;
4806 symstrtab_hdr->sh_link = 0;
4807 symstrtab_hdr->sh_info = 0;
4808 /* sh_offset is set just below. */
4809 symstrtab_hdr->sh_addralign = 1;
4811 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
4812 elf_tdata (abfd)->next_file_pos = off;
4814 if (bfd_get_symcount (abfd) > 0)
4816 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
4817 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
4821 /* Adjust the relocs to have the correct symbol indices. */
4822 for (o = abfd->sections; o != NULL; o = o->next)
4824 if ((o->flags & SEC_RELOC) == 0)
4827 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
4828 elf_section_data (o)->rel_count,
4829 elf_section_data (o)->rel_hashes);
4830 if (elf_section_data (o)->rel_hdr2 != NULL)
4831 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
4832 elf_section_data (o)->rel_count2,
4833 (elf_section_data (o)->rel_hashes
4834 + elf_section_data (o)->rel_count));
4836 /* Set the reloc_count field to 0 to prevent write_relocs from
4837 trying to swap the relocs out itself. */
4841 /* If we are linking against a dynamic object, or generating a
4842 shared library, finish up the dynamic linking information. */
4845 Elf_External_Dyn *dyncon, *dynconend;
4847 /* Fix up .dynamic entries. */
4848 o = bfd_get_section_by_name (dynobj, ".dynamic");
4849 BFD_ASSERT (o != NULL);
4851 dyncon = (Elf_External_Dyn *) o->contents;
4852 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
4853 for (; dyncon < dynconend; dyncon++)
4855 Elf_Internal_Dyn dyn;
4859 elf_swap_dyn_in (dynobj, dyncon, &dyn);
4866 name = info->init_function;
4869 name = info->fini_function;
4872 struct elf_link_hash_entry *h;
4874 h = elf_link_hash_lookup (elf_hash_table (info), name,
4875 false, false, true);
4877 && (h->root.type == bfd_link_hash_defined
4878 || h->root.type == bfd_link_hash_defweak))
4880 dyn.d_un.d_val = h->root.u.def.value;
4881 o = h->root.u.def.section;
4882 if (o->output_section != NULL)
4883 dyn.d_un.d_val += (o->output_section->vma
4884 + o->output_offset);
4887 /* The symbol is imported from another shared
4888 library and does not apply to this one. */
4892 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4907 name = ".gnu.version_d";
4910 name = ".gnu.version_r";
4913 name = ".gnu.version";
4915 o = bfd_get_section_by_name (abfd, name);
4916 BFD_ASSERT (o != NULL);
4917 dyn.d_un.d_ptr = o->vma;
4918 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4925 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
4930 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4932 Elf_Internal_Shdr *hdr;
4934 hdr = elf_elfsections (abfd)[i];
4935 if (hdr->sh_type == type
4936 && (hdr->sh_flags & SHF_ALLOC) != 0)
4938 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
4939 dyn.d_un.d_val += hdr->sh_size;
4942 if (dyn.d_un.d_val == 0
4943 || hdr->sh_addr < dyn.d_un.d_val)
4944 dyn.d_un.d_val = hdr->sh_addr;
4948 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4954 /* If we have created any dynamic sections, then output them. */
4957 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
4960 for (o = dynobj->sections; o != NULL; o = o->next)
4962 if ((o->flags & SEC_HAS_CONTENTS) == 0
4963 || o->_raw_size == 0
4964 || o->output_section == bfd_abs_section_ptr)
4966 if ((o->flags & SEC_LINKER_CREATED) == 0)
4968 /* At this point, we are only interested in sections
4969 created by elf_link_create_dynamic_sections. */
4972 if ((elf_section_data (o->output_section)->this_hdr.sh_type
4974 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
4976 if (! bfd_set_section_contents (abfd, o->output_section,
4977 o->contents, o->output_offset,
4985 /* The contents of the .dynstr section are actually in a
4987 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
4988 if (bfd_seek (abfd, off, SEEK_SET) != 0
4989 || ! _bfd_stringtab_emit (abfd,
4990 elf_hash_table (info)->dynstr))
4996 /* If we have optimized stabs strings, output them. */
4997 if (elf_hash_table (info)->stab_info != NULL)
4999 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
5003 if (finfo.symstrtab != NULL)
5004 _bfd_stringtab_free (finfo.symstrtab);
5005 if (finfo.contents != NULL)
5006 free (finfo.contents);
5007 if (finfo.external_relocs != NULL)
5008 free (finfo.external_relocs);
5009 if (finfo.internal_relocs != NULL)
5010 free (finfo.internal_relocs);
5011 if (finfo.external_syms != NULL)
5012 free (finfo.external_syms);
5013 if (finfo.internal_syms != NULL)
5014 free (finfo.internal_syms);
5015 if (finfo.indices != NULL)
5016 free (finfo.indices);
5017 if (finfo.sections != NULL)
5018 free (finfo.sections);
5019 if (finfo.symbuf != NULL)
5020 free (finfo.symbuf);
5021 for (o = abfd->sections; o != NULL; o = o->next)
5023 if ((o->flags & SEC_RELOC) != 0
5024 && elf_section_data (o)->rel_hashes != NULL)
5025 free (elf_section_data (o)->rel_hashes);
5028 elf_tdata (abfd)->linker = true;
5033 if (finfo.symstrtab != NULL)
5034 _bfd_stringtab_free (finfo.symstrtab);
5035 if (finfo.contents != NULL)
5036 free (finfo.contents);
5037 if (finfo.external_relocs != NULL)
5038 free (finfo.external_relocs);
5039 if (finfo.internal_relocs != NULL)
5040 free (finfo.internal_relocs);
5041 if (finfo.external_syms != NULL)
5042 free (finfo.external_syms);
5043 if (finfo.internal_syms != NULL)
5044 free (finfo.internal_syms);
5045 if (finfo.indices != NULL)
5046 free (finfo.indices);
5047 if (finfo.sections != NULL)
5048 free (finfo.sections);
5049 if (finfo.symbuf != NULL)
5050 free (finfo.symbuf);
5051 for (o = abfd->sections; o != NULL; o = o->next)
5053 if ((o->flags & SEC_RELOC) != 0
5054 && elf_section_data (o)->rel_hashes != NULL)
5055 free (elf_section_data (o)->rel_hashes);
5061 /* Add a symbol to the output symbol table. */
5064 elf_link_output_sym (finfo, name, elfsym, input_sec)
5065 struct elf_final_link_info *finfo;
5067 Elf_Internal_Sym *elfsym;
5068 asection *input_sec;
5070 boolean (*output_symbol_hook) PARAMS ((bfd *,
5071 struct bfd_link_info *info,
5076 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
5077 elf_backend_link_output_symbol_hook;
5078 if (output_symbol_hook != NULL)
5080 if (! ((*output_symbol_hook)
5081 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
5085 if (name == (const char *) NULL || *name == '\0')
5086 elfsym->st_name = 0;
5087 else if (input_sec->flags & SEC_EXCLUDE)
5088 elfsym->st_name = 0;
5091 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5094 if (elfsym->st_name == (unsigned long) -1)
5098 if (finfo->symbuf_count >= finfo->symbuf_size)
5100 if (! elf_link_flush_output_syms (finfo))
5104 elf_swap_symbol_out (finfo->output_bfd, elfsym,
5105 (PTR) (finfo->symbuf + finfo->symbuf_count));
5106 ++finfo->symbuf_count;
5108 ++ bfd_get_symcount (finfo->output_bfd);
5113 /* Flush the output symbols to the file. */
5116 elf_link_flush_output_syms (finfo)
5117 struct elf_final_link_info *finfo;
5119 if (finfo->symbuf_count > 0)
5121 Elf_Internal_Shdr *symtab;
5123 symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5125 if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
5127 || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
5128 sizeof (Elf_External_Sym), finfo->output_bfd)
5129 != finfo->symbuf_count * sizeof (Elf_External_Sym)))
5132 symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
5134 finfo->symbuf_count = 0;
5140 /* Adjust all external symbols pointing into SEC_MERGE sections
5141 to reflect the object merging within the sections. */
5144 elf_link_sec_merge_syms (h, data)
5145 struct elf_link_hash_entry *h;
5150 if ((h->root.type == bfd_link_hash_defined
5151 || h->root.type == bfd_link_hash_defweak)
5152 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
5153 && elf_section_data (sec)->merge_info)
5155 bfd *output_bfd = (bfd *) data;
5157 h->root.u.def.value =
5158 _bfd_merged_section_offset (output_bfd,
5159 &h->root.u.def.section,
5160 elf_section_data (sec)->merge_info,
5161 h->root.u.def.value, (bfd_vma) 0);
5167 /* Add an external symbol to the symbol table. This is called from
5168 the hash table traversal routine. When generating a shared object,
5169 we go through the symbol table twice. The first time we output
5170 anything that might have been forced to local scope in a version
5171 script. The second time we output the symbols that are still
5175 elf_link_output_extsym (h, data)
5176 struct elf_link_hash_entry *h;
5179 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
5180 struct elf_final_link_info *finfo = eoinfo->finfo;
5182 Elf_Internal_Sym sym;
5183 asection *input_sec;
5185 /* Decide whether to output this symbol in this pass. */
5186 if (eoinfo->localsyms)
5188 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5193 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5197 /* If we are not creating a shared library, and this symbol is
5198 referenced by a shared library but is not defined anywhere, then
5199 warn that it is undefined. If we do not do this, the runtime
5200 linker will complain that the symbol is undefined when the
5201 program is run. We don't have to worry about symbols that are
5202 referenced by regular files, because we will already have issued
5203 warnings for them. */
5204 if (! finfo->info->relocateable
5205 && ! finfo->info->allow_shlib_undefined
5206 && ! (finfo->info->shared
5207 && !finfo->info->no_undefined)
5208 && h->root.type == bfd_link_hash_undefined
5209 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
5210 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5212 if (! ((*finfo->info->callbacks->undefined_symbol)
5213 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
5214 (asection *) NULL, 0, true)))
5216 eoinfo->failed = true;
5221 /* We don't want to output symbols that have never been mentioned by
5222 a regular file, or that we have been told to strip. However, if
5223 h->indx is set to -2, the symbol is used by a reloc and we must
5227 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
5228 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
5229 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
5230 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5232 else if (finfo->info->strip == strip_all
5233 || (finfo->info->strip == strip_some
5234 && bfd_hash_lookup (finfo->info->keep_hash,
5235 h->root.root.string,
5236 false, false) == NULL))
5241 /* If we're stripping it, and it's not a dynamic symbol, there's
5242 nothing else to do unless it is a forced local symbol. */
5245 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5249 sym.st_size = h->size;
5250 sym.st_other = h->other;
5251 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5252 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
5253 else if (h->root.type == bfd_link_hash_undefweak
5254 || h->root.type == bfd_link_hash_defweak)
5255 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
5257 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
5259 switch (h->root.type)
5262 case bfd_link_hash_new:
5266 case bfd_link_hash_undefined:
5267 input_sec = bfd_und_section_ptr;
5268 sym.st_shndx = SHN_UNDEF;
5271 case bfd_link_hash_undefweak:
5272 input_sec = bfd_und_section_ptr;
5273 sym.st_shndx = SHN_UNDEF;
5276 case bfd_link_hash_defined:
5277 case bfd_link_hash_defweak:
5279 input_sec = h->root.u.def.section;
5280 if (input_sec->output_section != NULL)
5283 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
5284 input_sec->output_section);
5285 if (sym.st_shndx == (unsigned short) -1)
5287 (*_bfd_error_handler)
5288 (_("%s: could not find output section %s for input section %s"),
5289 bfd_get_filename (finfo->output_bfd),
5290 input_sec->output_section->name,
5292 eoinfo->failed = true;
5296 /* ELF symbols in relocateable files are section relative,
5297 but in nonrelocateable files they are virtual
5299 sym.st_value = h->root.u.def.value + input_sec->output_offset;
5300 if (! finfo->info->relocateable)
5301 sym.st_value += input_sec->output_section->vma;
5305 BFD_ASSERT (input_sec->owner == NULL
5306 || (input_sec->owner->flags & DYNAMIC) != 0);
5307 sym.st_shndx = SHN_UNDEF;
5308 input_sec = bfd_und_section_ptr;
5313 case bfd_link_hash_common:
5314 input_sec = h->root.u.c.p->section;
5315 sym.st_shndx = SHN_COMMON;
5316 sym.st_value = 1 << h->root.u.c.p->alignment_power;
5319 case bfd_link_hash_indirect:
5320 /* These symbols are created by symbol versioning. They point
5321 to the decorated version of the name. For example, if the
5322 symbol foo@@GNU_1.2 is the default, which should be used when
5323 foo is used with no version, then we add an indirect symbol
5324 foo which points to foo@@GNU_1.2. We ignore these symbols,
5325 since the indirected symbol is already in the hash table. */
5328 case bfd_link_hash_warning:
5329 /* We can't represent these symbols in ELF, although a warning
5330 symbol may have come from a .gnu.warning.SYMBOL section. We
5331 just put the target symbol in the hash table. If the target
5332 symbol does not really exist, don't do anything. */
5333 if (h->root.u.i.link->type == bfd_link_hash_new)
5335 return (elf_link_output_extsym
5336 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
5339 /* Give the processor backend a chance to tweak the symbol value,
5340 and also to finish up anything that needs to be done for this
5342 if ((h->dynindx != -1
5343 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5344 && elf_hash_table (finfo->info)->dynamic_sections_created)
5346 struct elf_backend_data *bed;
5348 bed = get_elf_backend_data (finfo->output_bfd);
5349 if (! ((*bed->elf_backend_finish_dynamic_symbol)
5350 (finfo->output_bfd, finfo->info, h, &sym)))
5352 eoinfo->failed = true;
5357 /* If we are marking the symbol as undefined, and there are no
5358 non-weak references to this symbol from a regular object, then
5359 mark the symbol as weak undefined; if there are non-weak
5360 references, mark the symbol as strong. We can't do this earlier,
5361 because it might not be marked as undefined until the
5362 finish_dynamic_symbol routine gets through with it. */
5363 if (sym.st_shndx == SHN_UNDEF
5364 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
5365 && (ELF_ST_BIND(sym.st_info) == STB_GLOBAL
5366 || ELF_ST_BIND(sym.st_info) == STB_WEAK))
5370 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
5371 bindtype = STB_GLOBAL;
5373 bindtype = STB_WEAK;
5374 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
5377 /* If a symbol is not defined locally, we clear the visibility
5379 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5380 sym.st_other ^= ELF_ST_VISIBILITY(sym.st_other);
5382 /* If this symbol should be put in the .dynsym section, then put it
5383 there now. We have already know the symbol index. We also fill
5384 in the entry in the .hash section. */
5385 if (h->dynindx != -1
5386 && elf_hash_table (finfo->info)->dynamic_sections_created)
5390 size_t hash_entry_size;
5391 bfd_byte *bucketpos;
5394 sym.st_name = h->dynstr_index;
5396 elf_swap_symbol_out (finfo->output_bfd, &sym,
5397 (PTR) (((Elf_External_Sym *)
5398 finfo->dynsym_sec->contents)
5401 bucketcount = elf_hash_table (finfo->info)->bucketcount;
5402 bucket = h->elf_hash_value % bucketcount;
5404 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
5405 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
5406 + (bucket + 2) * hash_entry_size);
5407 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
5408 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
5409 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
5410 ((bfd_byte *) finfo->hash_sec->contents
5411 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
5413 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
5415 Elf_Internal_Versym iversym;
5417 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5419 if (h->verinfo.verdef == NULL)
5420 iversym.vs_vers = 0;
5422 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
5426 if (h->verinfo.vertree == NULL)
5427 iversym.vs_vers = 1;
5429 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
5432 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
5433 iversym.vs_vers |= VERSYM_HIDDEN;
5435 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym,
5436 (((Elf_External_Versym *)
5437 finfo->symver_sec->contents)
5442 /* If we're stripping it, then it was just a dynamic symbol, and
5443 there's nothing else to do. */
5447 h->indx = bfd_get_symcount (finfo->output_bfd);
5449 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
5451 eoinfo->failed = true;
5458 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5459 originated from the section given by INPUT_REL_HDR) to the
5463 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
5466 asection *input_section;
5467 Elf_Internal_Shdr *input_rel_hdr;
5468 Elf_Internal_Rela *internal_relocs;
5470 Elf_Internal_Rela *irela;
5471 Elf_Internal_Rela *irelaend;
5472 Elf_Internal_Shdr *output_rel_hdr;
5473 asection *output_section;
5474 unsigned int *rel_countp = NULL;
5475 struct elf_backend_data *bed;
5477 output_section = input_section->output_section;
5478 output_rel_hdr = NULL;
5480 if (elf_section_data (output_section)->rel_hdr.sh_entsize
5481 == input_rel_hdr->sh_entsize)
5483 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
5484 rel_countp = &elf_section_data (output_section)->rel_count;
5486 else if (elf_section_data (output_section)->rel_hdr2
5487 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
5488 == input_rel_hdr->sh_entsize))
5490 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
5491 rel_countp = &elf_section_data (output_section)->rel_count2;
5494 BFD_ASSERT (output_rel_hdr != NULL);
5496 bed = get_elf_backend_data (output_bfd);
5497 irela = internal_relocs;
5498 irelaend = irela + NUM_SHDR_ENTRIES (input_rel_hdr)
5499 * bed->s->int_rels_per_ext_rel;
5501 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
5503 Elf_External_Rel *erel;
5504 Elf_Internal_Rel *irel;
5506 irel = (Elf_Internal_Rel *) bfd_zmalloc (bed->s->int_rels_per_ext_rel
5507 * sizeof (Elf_Internal_Rel));
5510 (*_bfd_error_handler) (_("Error: out of memory"));
5514 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
5515 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erel++)
5519 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
5521 irel[i].r_offset = irela[i].r_offset;
5522 irel[i].r_info = irela[i].r_info;
5523 BFD_ASSERT (irela[i].r_addend == 0);
5526 if (bed->s->swap_reloc_out)
5527 (*bed->s->swap_reloc_out) (output_bfd, irel, (PTR) erel);
5529 elf_swap_reloc_out (output_bfd, irel, erel);
5536 Elf_External_Rela *erela;
5538 BFD_ASSERT (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
5540 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
5541 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erela++)
5542 if (bed->s->swap_reloca_out)
5543 (*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
5545 elf_swap_reloca_out (output_bfd, irela, erela);
5548 /* Bump the counter, so that we know where to add the next set of
5550 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
5553 /* Link an input file into the linker output file. This function
5554 handles all the sections and relocations of the input file at once.
5555 This is so that we only have to read the local symbols once, and
5556 don't have to keep them in memory. */
5559 elf_link_input_bfd (finfo, input_bfd)
5560 struct elf_final_link_info *finfo;
5563 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
5564 bfd *, asection *, bfd_byte *,
5565 Elf_Internal_Rela *,
5566 Elf_Internal_Sym *, asection **));
5568 Elf_Internal_Shdr *symtab_hdr;
5571 Elf_External_Sym *external_syms;
5572 Elf_External_Sym *esym;
5573 Elf_External_Sym *esymend;
5574 Elf_Internal_Sym *isym;
5576 asection **ppsection;
5578 struct elf_backend_data *bed;
5580 output_bfd = finfo->output_bfd;
5581 bed = get_elf_backend_data (output_bfd);
5582 relocate_section = bed->elf_backend_relocate_section;
5584 /* If this is a dynamic object, we don't want to do anything here:
5585 we don't want the local symbols, and we don't want the section
5587 if ((input_bfd->flags & DYNAMIC) != 0)
5590 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5591 if (elf_bad_symtab (input_bfd))
5593 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
5598 locsymcount = symtab_hdr->sh_info;
5599 extsymoff = symtab_hdr->sh_info;
5602 /* Read the local symbols. */
5603 if (symtab_hdr->contents != NULL)
5604 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
5605 else if (locsymcount == 0)
5606 external_syms = NULL;
5609 external_syms = finfo->external_syms;
5610 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
5611 || (bfd_read (external_syms, sizeof (Elf_External_Sym),
5612 locsymcount, input_bfd)
5613 != locsymcount * sizeof (Elf_External_Sym)))
5617 /* Swap in the local symbols and write out the ones which we know
5618 are going into the output file. */
5619 esym = external_syms;
5620 esymend = esym + locsymcount;
5621 isym = finfo->internal_syms;
5622 pindex = finfo->indices;
5623 ppsection = finfo->sections;
5624 for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
5628 Elf_Internal_Sym osym;
5630 elf_swap_symbol_in (input_bfd, esym, isym);
5633 if (elf_bad_symtab (input_bfd))
5635 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
5643 if (isym->st_shndx == SHN_UNDEF)
5645 isec = bfd_und_section_ptr;
5648 else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
5650 isec = section_from_elf_index (input_bfd, isym->st_shndx);
5651 if (isec && elf_section_data (isec)->merge_info
5652 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
5654 _bfd_merged_section_offset (output_bfd, &isec,
5655 elf_section_data (isec)->merge_info,
5656 isym->st_value, (bfd_vma) 0);
5658 else if (isym->st_shndx == SHN_ABS)
5660 isec = bfd_abs_section_ptr;
5663 else if (isym->st_shndx == SHN_COMMON)
5665 isec = bfd_com_section_ptr;
5676 /* Don't output the first, undefined, symbol. */
5677 if (esym == external_syms)
5680 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5684 /* Save away all section symbol values. */
5689 if (isec->symbol->value != isym->st_value)
5690 (*_bfd_error_handler)
5691 (_("%s: invalid section symbol index 0x%x (%s) ingored"),
5692 bfd_get_filename (input_bfd), isym->st_shndx,
5696 isec->symbol->value = isym->st_value;
5699 /* If this is a discarded link-once section symbol, update
5700 it's value to that of the kept section symbol. The
5701 linker will keep the first of any matching link-once
5702 sections, so we should have already seen it's section
5703 symbol. I trust no-one will have the bright idea of
5704 re-ordering the bfd list... */
5706 && (bfd_get_section_flags (input_bfd, isec) & SEC_LINK_ONCE) != 0
5707 && (ksec = isec->kept_section) != NULL)
5709 isym->st_value = ksec->symbol->value;
5711 /* That put the value right, but the section info is all
5712 wrong. I hope this works. */
5713 isec->output_offset = ksec->output_offset;
5714 isec->output_section = ksec->output_section;
5717 /* We never output section symbols. Instead, we use the
5718 section symbol of the corresponding section in the output
5723 /* If we are stripping all symbols, we don't want to output this
5725 if (finfo->info->strip == strip_all)
5728 /* If we are discarding all local symbols, we don't want to
5729 output this one. If we are generating a relocateable output
5730 file, then some of the local symbols may be required by
5731 relocs; we output them below as we discover that they are
5733 if (finfo->info->discard == discard_all)
5736 /* If this symbol is defined in a section which we are
5737 discarding, we don't need to keep it, but note that
5738 linker_mark is only reliable for sections that have contents.
5739 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5740 as well as linker_mark. */
5741 if (isym->st_shndx > 0
5742 && isym->st_shndx < SHN_LORESERVE
5744 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
5745 || (! finfo->info->relocateable
5746 && (isec->flags & SEC_EXCLUDE) != 0)))
5749 /* Get the name of the symbol. */
5750 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
5755 /* See if we are discarding symbols with this name. */
5756 if ((finfo->info->strip == strip_some
5757 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
5759 || (((finfo->info->discard == discard_sec_merge
5760 && (isec->flags & SEC_MERGE) && ! finfo->info->relocateable)
5761 || finfo->info->discard == discard_l)
5762 && bfd_is_local_label_name (input_bfd, name)))
5765 /* If we get here, we are going to output this symbol. */
5769 /* Adjust the section index for the output file. */
5770 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
5771 isec->output_section);
5772 if (osym.st_shndx == (unsigned short) -1)
5775 *pindex = bfd_get_symcount (output_bfd);
5777 /* ELF symbols in relocateable files are section relative, but
5778 in executable files they are virtual addresses. Note that
5779 this code assumes that all ELF sections have an associated
5780 BFD section with a reasonable value for output_offset; below
5781 we assume that they also have a reasonable value for
5782 output_section. Any special sections must be set up to meet
5783 these requirements. */
5784 osym.st_value += isec->output_offset;
5785 if (! finfo->info->relocateable)
5786 osym.st_value += isec->output_section->vma;
5788 if (! elf_link_output_sym (finfo, name, &osym, isec))
5792 /* Relocate the contents of each section. */
5793 for (o = input_bfd->sections; o != NULL; o = o->next)
5797 if (! o->linker_mark)
5799 /* This section was omitted from the link. */
5803 if ((o->flags & SEC_HAS_CONTENTS) == 0
5804 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
5807 if ((o->flags & SEC_LINKER_CREATED) != 0)
5809 /* Section was created by elf_link_create_dynamic_sections
5814 /* Get the contents of the section. They have been cached by a
5815 relaxation routine. Note that o is a section in an input
5816 file, so the contents field will not have been set by any of
5817 the routines which work on output files. */
5818 if (elf_section_data (o)->this_hdr.contents != NULL)
5819 contents = elf_section_data (o)->this_hdr.contents;
5822 contents = finfo->contents;
5823 if (! bfd_get_section_contents (input_bfd, o, contents,
5824 (file_ptr) 0, o->_raw_size))
5828 if ((o->flags & SEC_RELOC) != 0)
5830 Elf_Internal_Rela *internal_relocs;
5832 /* Get the swapped relocs. */
5833 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
5834 (input_bfd, o, finfo->external_relocs,
5835 finfo->internal_relocs, false));
5836 if (internal_relocs == NULL
5837 && o->reloc_count > 0)
5840 /* Relocate the section by invoking a back end routine.
5842 The back end routine is responsible for adjusting the
5843 section contents as necessary, and (if using Rela relocs
5844 and generating a relocateable output file) adjusting the
5845 reloc addend as necessary.
5847 The back end routine does not have to worry about setting
5848 the reloc address or the reloc symbol index.
5850 The back end routine is given a pointer to the swapped in
5851 internal symbols, and can access the hash table entries
5852 for the external symbols via elf_sym_hashes (input_bfd).
5854 When generating relocateable output, the back end routine
5855 must handle STB_LOCAL/STT_SECTION symbols specially. The
5856 output symbol is going to be a section symbol
5857 corresponding to the output section, which will require
5858 the addend to be adjusted. */
5860 if (! (*relocate_section) (output_bfd, finfo->info,
5861 input_bfd, o, contents,
5863 finfo->internal_syms,
5867 if (finfo->info->relocateable || finfo->info->emitrelocations)
5869 Elf_Internal_Rela *irela;
5870 Elf_Internal_Rela *irelaend;
5871 struct elf_link_hash_entry **rel_hash;
5872 Elf_Internal_Shdr *input_rel_hdr;
5873 unsigned int next_erel;
5875 /* Adjust the reloc addresses and symbol indices. */
5877 irela = internal_relocs;
5879 + o->reloc_count * bed->s->int_rels_per_ext_rel;
5880 rel_hash = (elf_section_data (o->output_section)->rel_hashes
5881 + elf_section_data (o->output_section)->rel_count
5882 + elf_section_data (o->output_section)->rel_count2);
5883 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
5885 unsigned long r_symndx;
5886 Elf_Internal_Sym *isym;
5889 if (next_erel == bed->s->int_rels_per_ext_rel)
5895 irela->r_offset += o->output_offset;
5897 /* Relocs in an executable have to be virtual addresses. */
5898 if (finfo->info->emitrelocations)
5899 irela->r_offset += o->output_section->vma;
5901 r_symndx = ELF_R_SYM (irela->r_info);
5906 if (r_symndx >= locsymcount
5907 || (elf_bad_symtab (input_bfd)
5908 && finfo->sections[r_symndx] == NULL))
5910 struct elf_link_hash_entry *rh;
5913 /* This is a reloc against a global symbol. We
5914 have not yet output all the local symbols, so
5915 we do not know the symbol index of any global
5916 symbol. We set the rel_hash entry for this
5917 reloc to point to the global hash table entry
5918 for this symbol. The symbol index is then
5919 set at the end of elf_bfd_final_link. */
5920 indx = r_symndx - extsymoff;
5921 rh = elf_sym_hashes (input_bfd)[indx];
5922 while (rh->root.type == bfd_link_hash_indirect
5923 || rh->root.type == bfd_link_hash_warning)
5924 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
5926 /* Setting the index to -2 tells
5927 elf_link_output_extsym that this symbol is
5929 BFD_ASSERT (rh->indx < 0);
5937 /* This is a reloc against a local symbol. */
5940 isym = finfo->internal_syms + r_symndx;
5941 sec = finfo->sections[r_symndx];
5942 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5944 /* I suppose the backend ought to fill in the
5945 section of any STT_SECTION symbol against a
5946 processor specific section. If we have
5947 discarded a section, the output_section will
5948 be the absolute section. */
5950 && (bfd_is_abs_section (sec)
5951 || (sec->output_section != NULL
5952 && bfd_is_abs_section (sec->output_section))))
5954 else if (sec == NULL || sec->owner == NULL)
5956 bfd_set_error (bfd_error_bad_value);
5961 r_symndx = sec->output_section->target_index;
5962 BFD_ASSERT (r_symndx != 0);
5967 if (finfo->indices[r_symndx] == -1)
5973 if (finfo->info->strip == strip_all)
5975 /* You can't do ld -r -s. */
5976 bfd_set_error (bfd_error_invalid_operation);
5980 /* This symbol was skipped earlier, but
5981 since it is needed by a reloc, we
5982 must output it now. */
5983 link = symtab_hdr->sh_link;
5984 name = bfd_elf_string_from_elf_section (input_bfd,
5990 osec = sec->output_section;
5992 _bfd_elf_section_from_bfd_section (output_bfd,
5994 if (isym->st_shndx == (unsigned short) -1)
5997 isym->st_value += sec->output_offset;
5998 if (! finfo->info->relocateable)
5999 isym->st_value += osec->vma;
6001 finfo->indices[r_symndx] = bfd_get_symcount (output_bfd);
6003 if (! elf_link_output_sym (finfo, name, isym, sec))
6007 r_symndx = finfo->indices[r_symndx];
6010 irela->r_info = ELF_R_INFO (r_symndx,
6011 ELF_R_TYPE (irela->r_info));
6014 /* Swap out the relocs. */
6015 input_rel_hdr = &elf_section_data (o)->rel_hdr;
6016 elf_link_output_relocs (output_bfd, o,
6019 internal_relocs += NUM_SHDR_ENTRIES (input_rel_hdr)
6020 * bed->s->int_rels_per_ext_rel;
6021 input_rel_hdr = elf_section_data (o)->rel_hdr2;
6023 elf_link_output_relocs (output_bfd, o,
6029 /* Write out the modified section contents. */
6030 if (elf_section_data (o)->stab_info)
6032 if (! (_bfd_write_section_stabs
6033 (output_bfd, &elf_hash_table (finfo->info)->stab_info,
6034 o, &elf_section_data (o)->stab_info, contents)))
6037 else if (elf_section_data (o)->merge_info)
6039 if (! (_bfd_write_merged_section
6040 (output_bfd, o, elf_section_data (o)->merge_info)))
6045 if (! (o->flags & SEC_EXCLUDE) &&
6046 ! bfd_set_section_contents (output_bfd, o->output_section,
6047 contents, o->output_offset,
6048 (o->_cooked_size != 0
6058 /* Generate a reloc when linking an ELF file. This is a reloc
6059 requested by the linker, and does come from any input file. This
6060 is used to build constructor and destructor tables when linking
6064 elf_reloc_link_order (output_bfd, info, output_section, link_order)
6066 struct bfd_link_info *info;
6067 asection *output_section;
6068 struct bfd_link_order *link_order;
6070 reloc_howto_type *howto;
6074 struct elf_link_hash_entry **rel_hash_ptr;
6075 Elf_Internal_Shdr *rel_hdr;
6076 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
6078 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
6081 bfd_set_error (bfd_error_bad_value);
6085 addend = link_order->u.reloc.p->addend;
6087 /* Figure out the symbol index. */
6088 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
6089 + elf_section_data (output_section)->rel_count
6090 + elf_section_data (output_section)->rel_count2);
6091 if (link_order->type == bfd_section_reloc_link_order)
6093 indx = link_order->u.reloc.p->u.section->target_index;
6094 BFD_ASSERT (indx != 0);
6095 *rel_hash_ptr = NULL;
6099 struct elf_link_hash_entry *h;
6101 /* Treat a reloc against a defined symbol as though it were
6102 actually against the section. */
6103 h = ((struct elf_link_hash_entry *)
6104 bfd_wrapped_link_hash_lookup (output_bfd, info,
6105 link_order->u.reloc.p->u.name,
6106 false, false, true));
6108 && (h->root.type == bfd_link_hash_defined
6109 || h->root.type == bfd_link_hash_defweak))
6113 section = h->root.u.def.section;
6114 indx = section->output_section->target_index;
6115 *rel_hash_ptr = NULL;
6116 /* It seems that we ought to add the symbol value to the
6117 addend here, but in practice it has already been added
6118 because it was passed to constructor_callback. */
6119 addend += section->output_section->vma + section->output_offset;
6123 /* Setting the index to -2 tells elf_link_output_extsym that
6124 this symbol is used by a reloc. */
6131 if (! ((*info->callbacks->unattached_reloc)
6132 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
6133 (asection *) NULL, (bfd_vma) 0)))
6139 /* If this is an inplace reloc, we must write the addend into the
6141 if (howto->partial_inplace && addend != 0)
6144 bfd_reloc_status_type rstat;
6148 size = bfd_get_reloc_size (howto);
6149 buf = (bfd_byte *) bfd_zmalloc (size);
6150 if (buf == (bfd_byte *) NULL)
6152 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
6158 case bfd_reloc_outofrange:
6160 case bfd_reloc_overflow:
6161 if (! ((*info->callbacks->reloc_overflow)
6163 (link_order->type == bfd_section_reloc_link_order
6164 ? bfd_section_name (output_bfd,
6165 link_order->u.reloc.p->u.section)
6166 : link_order->u.reloc.p->u.name),
6167 howto->name, addend, (bfd *) NULL, (asection *) NULL,
6175 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
6176 (file_ptr) link_order->offset, size);
6182 /* The address of a reloc is relative to the section in a
6183 relocateable file, and is a virtual address in an executable
6185 offset = link_order->offset;
6186 if (! info->relocateable)
6187 offset += output_section->vma;
6189 rel_hdr = &elf_section_data (output_section)->rel_hdr;
6191 if (rel_hdr->sh_type == SHT_REL)
6193 Elf_Internal_Rel *irel;
6194 Elf_External_Rel *erel;
6197 irel = (Elf_Internal_Rel *) bfd_zmalloc (bed->s->int_rels_per_ext_rel
6198 * sizeof (Elf_Internal_Rel));
6202 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6203 irel[i].r_offset = offset;
6204 irel[0].r_info = ELF_R_INFO (indx, howto->type);
6206 erel = ((Elf_External_Rel *) rel_hdr->contents
6207 + elf_section_data (output_section)->rel_count);
6209 if (bed->s->swap_reloc_out)
6210 (*bed->s->swap_reloc_out) (output_bfd, irel, (bfd_byte *) erel);
6212 elf_swap_reloc_out (output_bfd, irel, erel);
6218 Elf_Internal_Rela *irela;
6219 Elf_External_Rela *erela;
6222 irela = (Elf_Internal_Rela *) bfd_zmalloc (bed->s->int_rels_per_ext_rel
6223 * sizeof (Elf_Internal_Rela));
6227 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6228 irela[i].r_offset = offset;
6229 irela[0].r_info = ELF_R_INFO (indx, howto->type);
6230 irela[0].r_addend = addend;
6232 erela = ((Elf_External_Rela *) rel_hdr->contents
6233 + elf_section_data (output_section)->rel_count);
6235 if (bed->s->swap_reloca_out)
6236 (*bed->s->swap_reloca_out) (output_bfd, irela, (bfd_byte *) erela);
6238 elf_swap_reloca_out (output_bfd, irela, erela);
6241 ++elf_section_data (output_section)->rel_count;
6246 /* Allocate a pointer to live in a linker created section. */
6249 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
6251 struct bfd_link_info *info;
6252 elf_linker_section_t *lsect;
6253 struct elf_link_hash_entry *h;
6254 const Elf_Internal_Rela *rel;
6256 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
6257 elf_linker_section_pointers_t *linker_section_ptr;
6258 unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
6260 BFD_ASSERT (lsect != NULL);
6262 /* Is this a global symbol? */
6265 /* Has this symbol already been allocated, if so, our work is done */
6266 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6271 ptr_linker_section_ptr = &h->linker_section_pointer;
6272 /* Make sure this symbol is output as a dynamic symbol. */
6273 if (h->dynindx == -1)
6275 if (! elf_link_record_dynamic_symbol (info, h))
6279 if (lsect->rel_section)
6280 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
6283 else /* Allocation of a pointer to a local symbol */
6285 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
6287 /* Allocate a table to hold the local symbols if first time */
6290 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
6291 register unsigned int i;
6293 ptr = (elf_linker_section_pointers_t **)
6294 bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
6299 elf_local_ptr_offsets (abfd) = ptr;
6300 for (i = 0; i < num_symbols; i++)
6301 ptr[i] = (elf_linker_section_pointers_t *)0;
6304 /* Has this symbol already been allocated, if so, our work is done */
6305 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
6310 ptr_linker_section_ptr = &ptr[r_symndx];
6314 /* If we are generating a shared object, we need to
6315 output a R_<xxx>_RELATIVE reloc so that the
6316 dynamic linker can adjust this GOT entry. */
6317 BFD_ASSERT (lsect->rel_section != NULL);
6318 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
6322 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
6323 from internal memory. */
6324 BFD_ASSERT (ptr_linker_section_ptr != NULL);
6325 linker_section_ptr = (elf_linker_section_pointers_t *)
6326 bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
6328 if (!linker_section_ptr)
6331 linker_section_ptr->next = *ptr_linker_section_ptr;
6332 linker_section_ptr->addend = rel->r_addend;
6333 linker_section_ptr->which = lsect->which;
6334 linker_section_ptr->written_address_p = false;
6335 *ptr_linker_section_ptr = linker_section_ptr;
6338 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
6340 linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8);
6341 lsect->hole_offset += ARCH_SIZE / 8;
6342 lsect->sym_offset += ARCH_SIZE / 8;
6343 if (lsect->sym_hash) /* Bump up symbol value if needed */
6345 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
6347 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
6348 lsect->sym_hash->root.root.string,
6349 (long)ARCH_SIZE / 8,
6350 (long)lsect->sym_hash->root.u.def.value);
6356 linker_section_ptr->offset = lsect->section->_raw_size;
6358 lsect->section->_raw_size += ARCH_SIZE / 8;
6361 fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
6362 lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
6369 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
6372 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
6375 /* Fill in the address for a pointer generated in a linker section. */
6378 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
6381 struct bfd_link_info *info;
6382 elf_linker_section_t *lsect;
6383 struct elf_link_hash_entry *h;
6385 const Elf_Internal_Rela *rel;
6388 elf_linker_section_pointers_t *linker_section_ptr;
6390 BFD_ASSERT (lsect != NULL);
6392 if (h != NULL) /* global symbol */
6394 linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6398 BFD_ASSERT (linker_section_ptr != NULL);
6400 if (! elf_hash_table (info)->dynamic_sections_created
6403 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
6405 /* This is actually a static link, or it is a
6406 -Bsymbolic link and the symbol is defined
6407 locally. We must initialize this entry in the
6410 When doing a dynamic link, we create a .rela.<xxx>
6411 relocation entry to initialize the value. This
6412 is done in the finish_dynamic_symbol routine. */
6413 if (!linker_section_ptr->written_address_p)
6415 linker_section_ptr->written_address_p = true;
6416 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6417 lsect->section->contents + linker_section_ptr->offset);
6421 else /* local symbol */
6423 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6424 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
6425 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
6426 linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
6430 BFD_ASSERT (linker_section_ptr != NULL);
6432 /* Write out pointer if it hasn't been rewritten out before */
6433 if (!linker_section_ptr->written_address_p)
6435 linker_section_ptr->written_address_p = true;
6436 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6437 lsect->section->contents + linker_section_ptr->offset);
6441 asection *srel = lsect->rel_section;
6442 Elf_Internal_Rela *outrel;
6443 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
6446 outrel = (Elf_Internal_Rela *) bfd_zmalloc (sizeof (Elf_Internal_Rela)
6447 * bed->s->int_rels_per_ext_rel);
6450 (*_bfd_error_handler) (_("Error: out of memory"));
6454 /* We need to generate a relative reloc for the dynamic linker. */
6456 lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
6459 BFD_ASSERT (srel != NULL);
6461 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6462 outrel[i].r_offset = (lsect->section->output_section->vma
6463 + lsect->section->output_offset
6464 + linker_section_ptr->offset);
6465 outrel[0].r_info = ELF_R_INFO (0, relative_reloc);
6466 outrel[0].r_addend = 0;
6467 elf_swap_reloca_out (output_bfd, outrel,
6468 (((Elf_External_Rela *)
6469 lsect->section->contents)
6470 + elf_section_data (lsect->section)->rel_count));
6471 ++elf_section_data (lsect->section)->rel_count;
6478 relocation = (lsect->section->output_offset
6479 + linker_section_ptr->offset
6480 - lsect->hole_offset
6481 - lsect->sym_offset);
6484 fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6485 lsect->name, (long)relocation, (long)relocation);
6488 /* Subtract out the addend, because it will get added back in by the normal
6490 return relocation - linker_section_ptr->addend;
6493 /* Garbage collect unused sections. */
6495 static boolean elf_gc_mark
6496 PARAMS ((struct bfd_link_info *info, asection *sec,
6497 asection * (*gc_mark_hook)
6498 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6499 struct elf_link_hash_entry *, Elf_Internal_Sym *))));
6501 static boolean elf_gc_sweep
6502 PARAMS ((struct bfd_link_info *info,
6503 boolean (*gc_sweep_hook)
6504 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6505 const Elf_Internal_Rela *relocs))));
6507 static boolean elf_gc_sweep_symbol
6508 PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
6510 static boolean elf_gc_allocate_got_offsets
6511 PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
6513 static boolean elf_gc_propagate_vtable_entries_used
6514 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6516 static boolean elf_gc_smash_unused_vtentry_relocs
6517 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6519 /* The mark phase of garbage collection. For a given section, mark
6520 it, and all the sections which define symbols to which it refers. */
6523 elf_gc_mark (info, sec, gc_mark_hook)
6524 struct bfd_link_info *info;
6526 asection * (*gc_mark_hook)
6527 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6528 struct elf_link_hash_entry *, Elf_Internal_Sym *));
6534 /* Look through the section relocs. */
6536 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
6538 Elf_Internal_Rela *relstart, *rel, *relend;
6539 Elf_Internal_Shdr *symtab_hdr;
6540 struct elf_link_hash_entry **sym_hashes;
6543 Elf_External_Sym *locsyms, *freesyms = NULL;
6544 bfd *input_bfd = sec->owner;
6545 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
6547 /* GCFIXME: how to arrange so that relocs and symbols are not
6548 reread continually? */
6550 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6551 sym_hashes = elf_sym_hashes (input_bfd);
6553 /* Read the local symbols. */
6554 if (elf_bad_symtab (input_bfd))
6556 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6560 extsymoff = nlocsyms = symtab_hdr->sh_info;
6561 if (symtab_hdr->contents)
6562 locsyms = (Elf_External_Sym *) symtab_hdr->contents;
6563 else if (nlocsyms == 0)
6567 locsyms = freesyms =
6568 bfd_malloc (nlocsyms * sizeof (Elf_External_Sym));
6569 if (freesyms == NULL
6570 || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
6571 || (bfd_read (locsyms, sizeof (Elf_External_Sym),
6572 nlocsyms, input_bfd)
6573 != nlocsyms * sizeof (Elf_External_Sym)))
6580 /* Read the relocations. */
6581 relstart = (NAME(_bfd_elf,link_read_relocs)
6582 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
6583 info->keep_memory));
6584 if (relstart == NULL)
6589 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6591 for (rel = relstart; rel < relend; rel++)
6593 unsigned long r_symndx;
6595 struct elf_link_hash_entry *h;
6598 r_symndx = ELF_R_SYM (rel->r_info);
6602 if (elf_bad_symtab (sec->owner))
6604 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6605 if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
6606 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
6609 h = sym_hashes[r_symndx - extsymoff];
6610 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
6613 else if (r_symndx >= nlocsyms)
6615 h = sym_hashes[r_symndx - extsymoff];
6616 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
6620 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6621 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
6624 if (rsec && !rsec->gc_mark)
6625 if (!elf_gc_mark (info, rsec, gc_mark_hook))
6633 if (!info->keep_memory)
6643 /* The sweep phase of garbage collection. Remove all garbage sections. */
6646 elf_gc_sweep (info, gc_sweep_hook)
6647 struct bfd_link_info *info;
6648 boolean (*gc_sweep_hook)
6649 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6650 const Elf_Internal_Rela *relocs));
6654 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6658 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
6661 for (o = sub->sections; o != NULL; o = o->next)
6663 /* Keep special sections. Keep .debug sections. */
6664 if ((o->flags & SEC_LINKER_CREATED)
6665 || (o->flags & SEC_DEBUGGING))
6671 /* Skip sweeping sections already excluded. */
6672 if (o->flags & SEC_EXCLUDE)
6675 /* Since this is early in the link process, it is simple
6676 to remove a section from the output. */
6677 o->flags |= SEC_EXCLUDE;
6679 /* But we also have to update some of the relocation
6680 info we collected before. */
6682 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
6684 Elf_Internal_Rela *internal_relocs;
6687 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6688 (o->owner, o, NULL, NULL, info->keep_memory));
6689 if (internal_relocs == NULL)
6692 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
6694 if (!info->keep_memory)
6695 free (internal_relocs);
6703 /* Remove the symbols that were in the swept sections from the dynamic
6704 symbol table. GCFIXME: Anyone know how to get them out of the
6705 static symbol table as well? */
6709 elf_link_hash_traverse (elf_hash_table (info),
6710 elf_gc_sweep_symbol,
6713 elf_hash_table (info)->dynsymcount = i;
6719 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6722 elf_gc_sweep_symbol (h, idxptr)
6723 struct elf_link_hash_entry *h;
6726 int *idx = (int *) idxptr;
6728 if (h->dynindx != -1
6729 && ((h->root.type != bfd_link_hash_defined
6730 && h->root.type != bfd_link_hash_defweak)
6731 || h->root.u.def.section->gc_mark))
6732 h->dynindx = (*idx)++;
6737 /* Propogate collected vtable information. This is called through
6738 elf_link_hash_traverse. */
6741 elf_gc_propagate_vtable_entries_used (h, okp)
6742 struct elf_link_hash_entry *h;
6745 /* Those that are not vtables. */
6746 if (h->vtable_parent == NULL)
6749 /* Those vtables that do not have parents, we cannot merge. */
6750 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
6753 /* If we've already been done, exit. */
6754 if (h->vtable_entries_used && h->vtable_entries_used[-1])
6757 /* Make sure the parent's table is up to date. */
6758 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
6760 if (h->vtable_entries_used == NULL)
6762 /* None of this table's entries were referenced. Re-use the
6764 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
6765 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
6773 /* Or the parent's entries into ours. */
6774 cu = h->vtable_entries_used;
6776 pu = h->vtable_parent->vtable_entries_used;
6779 asection *sec = h->root.u.def.section;
6780 struct elf_backend_data *bed = get_elf_backend_data (sec->owner);
6781 int file_align = bed->s->file_align;
6783 n = h->vtable_parent->vtable_entries_size / file_align;
6786 if (*pu) *cu = true;
6796 elf_gc_smash_unused_vtentry_relocs (h, okp)
6797 struct elf_link_hash_entry *h;
6801 bfd_vma hstart, hend;
6802 Elf_Internal_Rela *relstart, *relend, *rel;
6803 struct elf_backend_data *bed;
6806 /* Take care of both those symbols that do not describe vtables as
6807 well as those that are not loaded. */
6808 if (h->vtable_parent == NULL)
6811 BFD_ASSERT (h->root.type == bfd_link_hash_defined
6812 || h->root.type == bfd_link_hash_defweak);
6814 sec = h->root.u.def.section;
6815 hstart = h->root.u.def.value;
6816 hend = hstart + h->size;
6818 relstart = (NAME(_bfd_elf,link_read_relocs)
6819 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
6821 return *(boolean *)okp = false;
6822 bed = get_elf_backend_data (sec->owner);
6823 file_align = bed->s->file_align;
6825 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6827 for (rel = relstart; rel < relend; ++rel)
6828 if (rel->r_offset >= hstart && rel->r_offset < hend)
6830 /* If the entry is in use, do nothing. */
6831 if (h->vtable_entries_used
6832 && (rel->r_offset - hstart) < h->vtable_entries_size)
6834 bfd_vma entry = (rel->r_offset - hstart) / file_align;
6835 if (h->vtable_entries_used[entry])
6838 /* Otherwise, kill it. */
6839 rel->r_offset = rel->r_info = rel->r_addend = 0;
6845 /* Do mark and sweep of unused sections. */
6848 elf_gc_sections (abfd, info)
6850 struct bfd_link_info *info;
6854 asection * (*gc_mark_hook)
6855 PARAMS ((bfd *abfd, struct bfd_link_info *, Elf_Internal_Rela *,
6856 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
6858 if (!get_elf_backend_data (abfd)->can_gc_sections
6859 || info->relocateable || info->emitrelocations
6860 || elf_hash_table (info)->dynamic_sections_created)
6863 /* Apply transitive closure to the vtable entry usage info. */
6864 elf_link_hash_traverse (elf_hash_table (info),
6865 elf_gc_propagate_vtable_entries_used,
6870 /* Kill the vtable relocations that were not used. */
6871 elf_link_hash_traverse (elf_hash_table (info),
6872 elf_gc_smash_unused_vtentry_relocs,
6877 /* Grovel through relocs to find out who stays ... */
6879 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
6880 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6884 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
6887 for (o = sub->sections; o != NULL; o = o->next)
6889 if (o->flags & SEC_KEEP)
6890 if (!elf_gc_mark (info, o, gc_mark_hook))
6895 /* ... and mark SEC_EXCLUDE for those that go. */
6896 if (!elf_gc_sweep(info, get_elf_backend_data (abfd)->gc_sweep_hook))
6902 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6905 elf_gc_record_vtinherit (abfd, sec, h, offset)
6908 struct elf_link_hash_entry *h;
6911 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
6912 struct elf_link_hash_entry **search, *child;
6913 bfd_size_type extsymcount;
6915 /* The sh_info field of the symtab header tells us where the
6916 external symbols start. We don't care about the local symbols at
6918 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
6919 if (!elf_bad_symtab (abfd))
6920 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
6922 sym_hashes = elf_sym_hashes (abfd);
6923 sym_hashes_end = sym_hashes + extsymcount;
6925 /* Hunt down the child symbol, which is in this section at the same
6926 offset as the relocation. */
6927 for (search = sym_hashes; search != sym_hashes_end; ++search)
6929 if ((child = *search) != NULL
6930 && (child->root.type == bfd_link_hash_defined
6931 || child->root.type == bfd_link_hash_defweak)
6932 && child->root.u.def.section == sec
6933 && child->root.u.def.value == offset)
6937 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
6938 bfd_get_filename (abfd), sec->name,
6939 (unsigned long)offset);
6940 bfd_set_error (bfd_error_invalid_operation);
6946 /* This *should* only be the absolute section. It could potentially
6947 be that someone has defined a non-global vtable though, which
6948 would be bad. It isn't worth paging in the local symbols to be
6949 sure though; that case should simply be handled by the assembler. */
6951 child->vtable_parent = (struct elf_link_hash_entry *) -1;
6954 child->vtable_parent = h;
6959 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6962 elf_gc_record_vtentry (abfd, sec, h, addend)
6963 bfd *abfd ATTRIBUTE_UNUSED;
6964 asection *sec ATTRIBUTE_UNUSED;
6965 struct elf_link_hash_entry *h;
6968 struct elf_backend_data *bed = get_elf_backend_data (abfd);
6969 int file_align = bed->s->file_align;
6971 if (addend >= h->vtable_entries_size)
6974 boolean *ptr = h->vtable_entries_used;
6976 /* While the symbol is undefined, we have to be prepared to handle
6978 if (h->root.type == bfd_link_hash_undefined)
6985 /* Oops! We've got a reference past the defined end of
6986 the table. This is probably a bug -- shall we warn? */
6991 /* Allocate one extra entry for use as a "done" flag for the
6992 consolidation pass. */
6993 bytes = (size / file_align + 1) * sizeof (boolean);
6997 ptr = bfd_realloc (ptr - 1, bytes);
7003 oldbytes = (h->vtable_entries_size/file_align + 1) * sizeof (boolean);
7004 memset (((char *)ptr) + oldbytes, 0, bytes - oldbytes);
7008 ptr = bfd_zmalloc (bytes);
7013 /* And arrange for that done flag to be at index -1. */
7014 h->vtable_entries_used = ptr + 1;
7015 h->vtable_entries_size = size;
7018 h->vtable_entries_used[addend / file_align] = true;
7023 /* And an accompanying bit to work out final got entry offsets once
7024 we're done. Should be called from final_link. */
7027 elf_gc_common_finalize_got_offsets (abfd, info)
7029 struct bfd_link_info *info;
7032 struct elf_backend_data *bed = get_elf_backend_data (abfd);
7035 /* The GOT offset is relative to the .got section, but the GOT header is
7036 put into the .got.plt section, if the backend uses it. */
7037 if (bed->want_got_plt)
7040 gotoff = bed->got_header_size;
7042 /* Do the local .got entries first. */
7043 for (i = info->input_bfds; i; i = i->link_next)
7045 bfd_signed_vma *local_got;
7046 bfd_size_type j, locsymcount;
7047 Elf_Internal_Shdr *symtab_hdr;
7049 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
7052 local_got = elf_local_got_refcounts (i);
7056 symtab_hdr = &elf_tdata (i)->symtab_hdr;
7057 if (elf_bad_symtab (i))
7058 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
7060 locsymcount = symtab_hdr->sh_info;
7062 for (j = 0; j < locsymcount; ++j)
7064 if (local_got[j] > 0)
7066 local_got[j] = gotoff;
7067 gotoff += ARCH_SIZE / 8;
7070 local_got[j] = (bfd_vma) -1;
7074 /* Then the global .got entries. .plt refcounts are handled by
7075 adjust_dynamic_symbol */
7076 elf_link_hash_traverse (elf_hash_table (info),
7077 elf_gc_allocate_got_offsets,
7082 /* We need a special top-level link routine to convert got reference counts
7083 to real got offsets. */
7086 elf_gc_allocate_got_offsets (h, offarg)
7087 struct elf_link_hash_entry *h;
7090 bfd_vma *off = (bfd_vma *) offarg;
7092 if (h->got.refcount > 0)
7094 h->got.offset = off[0];
7095 off[0] += ARCH_SIZE / 8;
7098 h->got.offset = (bfd_vma) -1;
7103 /* Many folk need no more in the way of final link than this, once
7104 got entry reference counting is enabled. */
7107 elf_gc_common_final_link (abfd, info)
7109 struct bfd_link_info *info;
7111 if (!elf_gc_common_finalize_got_offsets (abfd, info))
7114 /* Invoke the regular ELF backend linker to do all the work. */
7115 return elf_bfd_final_link (abfd, info);
7118 /* This function will be called though elf_link_hash_traverse to store
7119 all hash value of the exported symbols in an array. */
7122 elf_collect_hash_codes (h, data)
7123 struct elf_link_hash_entry *h;
7126 unsigned long **valuep = (unsigned long **) data;
7132 /* Ignore indirect symbols. These are added by the versioning code. */
7133 if (h->dynindx == -1)
7136 name = h->root.root.string;
7137 p = strchr (name, ELF_VER_CHR);
7140 alc = bfd_malloc (p - name + 1);
7141 memcpy (alc, name, p - name);
7142 alc[p - name] = '\0';
7146 /* Compute the hash value. */
7147 ha = bfd_elf_hash (name);
7149 /* Store the found hash value in the array given as the argument. */
7152 /* And store it in the struct so that we can put it in the hash table
7154 h->elf_hash_value = ha;