2 Copyright 1995, 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info *info;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd *, struct bfd_link_info *));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd *, struct bfd_link_info *));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
37 asection **, bfd_vma *, struct elf_link_hash_entry **,
38 boolean *, boolean *, boolean *, boolean));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry *, PTR));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry *, PTR));
45 static boolean elf_link_find_version_dependencies
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_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry *, PTR));
51 static boolean elf_collect_hash_codes
52 PARAMS ((struct elf_link_hash_entry *, PTR));
53 static boolean elf_link_read_relocs_from_section
54 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
55 static void elf_link_output_relocs
56 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
57 static boolean elf_link_size_reloc_section
58 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
59 static void elf_link_adjust_relocs
60 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
61 struct elf_link_hash_entry **));
63 /* Given an ELF BFD, add symbols to the global hash table as
67 elf_bfd_link_add_symbols (abfd, info)
69 struct bfd_link_info *info;
71 switch (bfd_get_format (abfd))
74 return elf_link_add_object_symbols (abfd, info);
76 return elf_link_add_archive_symbols (abfd, info);
78 bfd_set_error (bfd_error_wrong_format);
83 /* Return true iff this is a non-common definition of a symbol. */
85 is_global_symbol_definition (abfd, sym)
86 bfd * abfd ATTRIBUTE_UNUSED;
87 Elf_Internal_Sym * sym;
89 /* Local symbols do not count, but target specific ones might. */
90 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
91 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
94 /* If the section is undefined, then so is the symbol. */
95 if (sym->st_shndx == SHN_UNDEF)
98 /* If the symbol is defined in the common section, then
99 it is a common definition and so does not count. */
100 if (sym->st_shndx == SHN_COMMON)
103 /* If the symbol is in a target specific section then we
104 must rely upon the backend to tell us what it is. */
105 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
106 /* FIXME - this function is not coded yet:
108 return _bfd_is_global_symbol_definition (abfd, sym);
110 Instead for now assume that the definition is not global,
111 Even if this is wrong, at least the linker will behave
112 in the same way that it used to do. */
119 /* Search the symbol table of the archive element of the archive ABFD
120 whoes archove map contains a mention of SYMDEF, and determine if
121 the symbol is defined in this element. */
123 elf_link_is_defined_archive_symbol (abfd, symdef)
127 Elf_Internal_Shdr * hdr;
128 Elf_External_Sym * esym;
129 Elf_External_Sym * esymend;
130 Elf_External_Sym * buf = NULL;
134 boolean result = false;
136 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
137 if (abfd == (bfd *) NULL)
140 if (! bfd_check_format (abfd, bfd_object))
143 /* If we have already included the element containing this symbol in the
144 link then we do not need to include it again. Just claim that any symbol
145 it contains is not a definition, so that our caller will not decide to
146 (re)include this element. */
147 if (abfd->archive_pass)
150 /* Select the appropriate symbol table. */
151 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
152 hdr = &elf_tdata (abfd)->symtab_hdr;
154 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
156 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
158 /* The sh_info field of the symtab header tells us where the
159 external symbols start. We don't care about the local symbols. */
160 if (elf_bad_symtab (abfd))
162 extsymcount = symcount;
167 extsymcount = symcount - hdr->sh_info;
168 extsymoff = hdr->sh_info;
171 buf = ((Elf_External_Sym *)
172 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
173 if (buf == NULL && extsymcount != 0)
176 /* Read in the symbol table.
177 FIXME: This ought to be cached somewhere. */
179 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
181 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
182 != extsymcount * sizeof (Elf_External_Sym)))
188 /* Scan the symbol table looking for SYMDEF. */
189 esymend = buf + extsymcount;
194 Elf_Internal_Sym sym;
197 elf_swap_symbol_in (abfd, esym, & sym);
199 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
200 if (name == (const char *) NULL)
203 if (strcmp (name, symdef->name) == 0)
205 result = is_global_symbol_definition (abfd, & sym);
216 /* Add symbols from an ELF archive file to the linker hash table. We
217 don't use _bfd_generic_link_add_archive_symbols because of a
218 problem which arises on UnixWare. The UnixWare libc.so is an
219 archive which includes an entry libc.so.1 which defines a bunch of
220 symbols. The libc.so archive also includes a number of other
221 object files, which also define symbols, some of which are the same
222 as those defined in libc.so.1. Correct linking requires that we
223 consider each object file in turn, and include it if it defines any
224 symbols we need. _bfd_generic_link_add_archive_symbols does not do
225 this; it looks through the list of undefined symbols, and includes
226 any object file which defines them. When this algorithm is used on
227 UnixWare, it winds up pulling in libc.so.1 early and defining a
228 bunch of symbols. This means that some of the other objects in the
229 archive are not included in the link, which is incorrect since they
230 precede libc.so.1 in the archive.
232 Fortunately, ELF archive handling is simpler than that done by
233 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
234 oddities. In ELF, if we find a symbol in the archive map, and the
235 symbol is currently undefined, we know that we must pull in that
238 Unfortunately, we do have to make multiple passes over the symbol
239 table until nothing further is resolved. */
242 elf_link_add_archive_symbols (abfd, info)
244 struct bfd_link_info *info;
247 boolean *defined = NULL;
248 boolean *included = NULL;
252 if (! bfd_has_map (abfd))
254 /* An empty archive is a special case. */
255 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
257 bfd_set_error (bfd_error_no_armap);
261 /* Keep track of all symbols we know to be already defined, and all
262 files we know to be already included. This is to speed up the
263 second and subsequent passes. */
264 c = bfd_ardata (abfd)->symdef_count;
267 defined = (boolean *) bfd_malloc (c * sizeof (boolean));
268 included = (boolean *) bfd_malloc (c * sizeof (boolean));
269 if (defined == (boolean *) NULL || included == (boolean *) NULL)
271 memset (defined, 0, c * sizeof (boolean));
272 memset (included, 0, c * sizeof (boolean));
274 symdefs = bfd_ardata (abfd)->symdefs;
287 symdefend = symdef + c;
288 for (i = 0; symdef < symdefend; symdef++, i++)
290 struct elf_link_hash_entry *h;
292 struct bfd_link_hash_entry *undefs_tail;
295 if (defined[i] || included[i])
297 if (symdef->file_offset == last)
303 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
304 false, false, false);
310 /* If this is a default version (the name contains @@),
311 look up the symbol again without the version. The
312 effect is that references to the symbol without the
313 version will be matched by the default symbol in the
316 p = strchr (symdef->name, ELF_VER_CHR);
317 if (p == NULL || p[1] != ELF_VER_CHR)
320 copy = bfd_alloc (abfd, p - symdef->name + 1);
323 memcpy (copy, symdef->name, p - symdef->name);
324 copy[p - symdef->name] = '\0';
326 h = elf_link_hash_lookup (elf_hash_table (info), copy,
327 false, false, false);
329 bfd_release (abfd, copy);
335 if (h->root.type == bfd_link_hash_common)
337 /* We currently have a common symbol. The archive map contains
338 a reference to this symbol, so we may want to include it. We
339 only want to include it however, if this archive element
340 contains a definition of the symbol, not just another common
343 Unfortunately some archivers (including GNU ar) will put
344 declarations of common symbols into their archive maps, as
345 well as real definitions, so we cannot just go by the archive
346 map alone. Instead we must read in the element's symbol
347 table and check that to see what kind of symbol definition
349 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
352 else if (h->root.type != bfd_link_hash_undefined)
354 if (h->root.type != bfd_link_hash_undefweak)
359 /* We need to include this archive member. */
360 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
361 if (element == (bfd *) NULL)
364 if (! bfd_check_format (element, bfd_object))
367 /* Doublecheck that we have not included this object
368 already--it should be impossible, but there may be
369 something wrong with the archive. */
370 if (element->archive_pass != 0)
372 bfd_set_error (bfd_error_bad_value);
375 element->archive_pass = 1;
377 undefs_tail = info->hash->undefs_tail;
379 if (! (*info->callbacks->add_archive_element) (info, element,
382 if (! elf_link_add_object_symbols (element, info))
385 /* If there are any new undefined symbols, we need to make
386 another pass through the archive in order to see whether
387 they can be defined. FIXME: This isn't perfect, because
388 common symbols wind up on undefs_tail and because an
389 undefined symbol which is defined later on in this pass
390 does not require another pass. This isn't a bug, but it
391 does make the code less efficient than it could be. */
392 if (undefs_tail != info->hash->undefs_tail)
395 /* Look backward to mark all symbols from this object file
396 which we have already seen in this pass. */
400 included[mark] = true;
405 while (symdefs[mark].file_offset == symdef->file_offset);
407 /* We mark subsequent symbols from this object file as we go
408 on through the loop. */
409 last = symdef->file_offset;
420 if (defined != (boolean *) NULL)
422 if (included != (boolean *) NULL)
427 /* This function is called when we want to define a new symbol. It
428 handles the various cases which arise when we find a definition in
429 a dynamic object, or when there is already a definition in a
430 dynamic object. The new symbol is described by NAME, SYM, PSEC,
431 and PVALUE. We set SYM_HASH to the hash table entry. We set
432 OVERRIDE if the old symbol is overriding a new definition. We set
433 TYPE_CHANGE_OK if it is OK for the type to change. We set
434 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
435 change, we mean that we shouldn't warn if the type or size does
436 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
440 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
441 override, type_change_ok, size_change_ok, dt_needed)
443 struct bfd_link_info *info;
445 Elf_Internal_Sym *sym;
448 struct elf_link_hash_entry **sym_hash;
450 boolean *type_change_ok;
451 boolean *size_change_ok;
455 struct elf_link_hash_entry *h;
458 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
463 bind = ELF_ST_BIND (sym->st_info);
465 if (! bfd_is_und_section (sec))
466 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
468 h = ((struct elf_link_hash_entry *)
469 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
474 /* This code is for coping with dynamic objects, and is only useful
475 if we are doing an ELF link. */
476 if (info->hash->creator != abfd->xvec)
479 /* For merging, we only care about real symbols. */
481 while (h->root.type == bfd_link_hash_indirect
482 || h->root.type == bfd_link_hash_warning)
483 h = (struct elf_link_hash_entry *) h->root.u.i.link;
485 /* If we just created the symbol, mark it as being an ELF symbol.
486 Other than that, there is nothing to do--there is no merge issue
487 with a newly defined symbol--so we just return. */
489 if (h->root.type == bfd_link_hash_new)
491 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
495 /* OLDBFD is a BFD associated with the existing symbol. */
497 switch (h->root.type)
503 case bfd_link_hash_undefined:
504 case bfd_link_hash_undefweak:
505 oldbfd = h->root.u.undef.abfd;
508 case bfd_link_hash_defined:
509 case bfd_link_hash_defweak:
510 oldbfd = h->root.u.def.section->owner;
513 case bfd_link_hash_common:
514 oldbfd = h->root.u.c.p->section->owner;
518 /* In cases involving weak versioned symbols, we may wind up trying
519 to merge a symbol with itself. Catch that here, to avoid the
520 confusion that results if we try to override a symbol with
521 itself. The additional tests catch cases like
522 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
523 dynamic object, which we do want to handle here. */
525 && ((abfd->flags & DYNAMIC) == 0
526 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
529 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
530 respectively, is from a dynamic object. */
532 if ((abfd->flags & DYNAMIC) != 0)
538 olddyn = (oldbfd->flags & DYNAMIC) != 0;
543 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
544 indices used by MIPS ELF. */
545 switch (h->root.type)
551 case bfd_link_hash_defined:
552 case bfd_link_hash_defweak:
553 hsec = h->root.u.def.section;
556 case bfd_link_hash_common:
557 hsec = h->root.u.c.p->section;
564 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
567 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
568 respectively, appear to be a definition rather than reference. */
570 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
575 if (h->root.type == bfd_link_hash_undefined
576 || h->root.type == bfd_link_hash_undefweak
577 || h->root.type == bfd_link_hash_common)
582 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
583 symbol, respectively, appears to be a common symbol in a dynamic
584 object. If a symbol appears in an uninitialized section, and is
585 not weak, and is not a function, then it may be a common symbol
586 which was resolved when the dynamic object was created. We want
587 to treat such symbols specially, because they raise special
588 considerations when setting the symbol size: if the symbol
589 appears as a common symbol in a regular object, and the size in
590 the regular object is larger, we must make sure that we use the
591 larger size. This problematic case can always be avoided in C,
592 but it must be handled correctly when using Fortran shared
595 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
596 likewise for OLDDYNCOMMON and OLDDEF.
598 Note that this test is just a heuristic, and that it is quite
599 possible to have an uninitialized symbol in a shared object which
600 is really a definition, rather than a common symbol. This could
601 lead to some minor confusion when the symbol really is a common
602 symbol in some regular object. However, I think it will be
607 && (sec->flags & SEC_ALLOC) != 0
608 && (sec->flags & SEC_LOAD) == 0
611 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
614 newdyncommon = false;
618 && h->root.type == bfd_link_hash_defined
619 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
620 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
621 && (h->root.u.def.section->flags & SEC_LOAD) == 0
623 && h->type != STT_FUNC)
626 olddyncommon = false;
628 /* It's OK to change the type if either the existing symbol or the
629 new symbol is weak unless it comes from a DT_NEEDED entry of
630 a shared object, in which case, the DT_NEEDED entry may not be
631 required at the run time. */
633 if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
634 || h->root.type == bfd_link_hash_undefweak
636 *type_change_ok = true;
638 /* It's OK to change the size if either the existing symbol or the
639 new symbol is weak, or if the old symbol is undefined. */
642 || h->root.type == bfd_link_hash_undefined)
643 *size_change_ok = true;
645 /* If both the old and the new symbols look like common symbols in a
646 dynamic object, set the size of the symbol to the larger of the
651 && sym->st_size != h->size)
653 /* Since we think we have two common symbols, issue a multiple
654 common warning if desired. Note that we only warn if the
655 size is different. If the size is the same, we simply let
656 the old symbol override the new one as normally happens with
657 symbols defined in dynamic objects. */
659 if (! ((*info->callbacks->multiple_common)
660 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
661 h->size, abfd, bfd_link_hash_common, sym->st_size)))
664 if (sym->st_size > h->size)
665 h->size = sym->st_size;
667 *size_change_ok = true;
670 /* If we are looking at a dynamic object, and we have found a
671 definition, we need to see if the symbol was already defined by
672 some other object. If so, we want to use the existing
673 definition, and we do not want to report a multiple symbol
674 definition error; we do this by clobbering *PSEC to be
677 We treat a common symbol as a definition if the symbol in the
678 shared library is a function, since common symbols always
679 represent variables; this can cause confusion in principle, but
680 any such confusion would seem to indicate an erroneous program or
681 shared library. We also permit a common symbol in a regular
682 object to override a weak symbol in a shared object.
684 We prefer a non-weak definition in a shared library to a weak
685 definition in the executable unless it comes from a DT_NEEDED
686 entry of a shared object, in which case, the DT_NEEDED entry
687 may not be required at the run time. */
692 || (h->root.type == bfd_link_hash_common
694 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
695 && (h->root.type != bfd_link_hash_defweak
697 || bind == STB_WEAK))
701 newdyncommon = false;
703 *psec = sec = bfd_und_section_ptr;
704 *size_change_ok = true;
706 /* If we get here when the old symbol is a common symbol, then
707 we are explicitly letting it override a weak symbol or
708 function in a dynamic object, and we don't want to warn about
709 a type change. If the old symbol is a defined symbol, a type
710 change warning may still be appropriate. */
712 if (h->root.type == bfd_link_hash_common)
713 *type_change_ok = true;
716 /* Handle the special case of an old common symbol merging with a
717 new symbol which looks like a common symbol in a shared object.
718 We change *PSEC and *PVALUE to make the new symbol look like a
719 common symbol, and let _bfd_generic_link_add_one_symbol will do
723 && h->root.type == bfd_link_hash_common)
727 newdyncommon = false;
728 *pvalue = sym->st_size;
729 *psec = sec = bfd_com_section_ptr;
730 *size_change_ok = true;
733 /* If the old symbol is from a dynamic object, and the new symbol is
734 a definition which is not from a dynamic object, then the new
735 symbol overrides the old symbol. Symbols from regular files
736 always take precedence over symbols from dynamic objects, even if
737 they are defined after the dynamic object in the link.
739 As above, we again permit a common symbol in a regular object to
740 override a definition in a shared object if the shared object
741 symbol is a function or is weak.
743 As above, we permit a non-weak definition in a shared object to
744 override a weak definition in a regular object. */
748 || (bfd_is_com_section (sec)
749 && (h->root.type == bfd_link_hash_defweak
750 || h->type == STT_FUNC)))
753 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
755 || h->root.type == bfd_link_hash_defweak))
757 /* Change the hash table entry to undefined, and let
758 _bfd_generic_link_add_one_symbol do the right thing with the
761 h->root.type = bfd_link_hash_undefined;
762 h->root.u.undef.abfd = h->root.u.def.section->owner;
763 *size_change_ok = true;
766 olddyncommon = false;
768 /* We again permit a type change when a common symbol may be
769 overriding a function. */
771 if (bfd_is_com_section (sec))
772 *type_change_ok = true;
774 /* This union may have been set to be non-NULL when this symbol
775 was seen in a dynamic object. We must force the union to be
776 NULL, so that it is correct for a regular symbol. */
778 h->verinfo.vertree = NULL;
780 /* In this special case, if H is the target of an indirection,
781 we want the caller to frob with H rather than with the
782 indirect symbol. That will permit the caller to redefine the
783 target of the indirection, rather than the indirect symbol
784 itself. FIXME: This will break the -y option if we store a
785 symbol with a different name. */
789 /* Handle the special case of a new common symbol merging with an
790 old symbol that looks like it might be a common symbol defined in
791 a shared object. Note that we have already handled the case in
792 which a new common symbol should simply override the definition
793 in the shared library. */
796 && bfd_is_com_section (sec)
799 /* It would be best if we could set the hash table entry to a
800 common symbol, but we don't know what to use for the section
802 if (! ((*info->callbacks->multiple_common)
803 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
804 h->size, abfd, bfd_link_hash_common, sym->st_size)))
807 /* If the predumed common symbol in the dynamic object is
808 larger, pretend that the new symbol has its size. */
810 if (h->size > *pvalue)
813 /* FIXME: We no longer know the alignment required by the symbol
814 in the dynamic object, so we just wind up using the one from
815 the regular object. */
818 olddyncommon = false;
820 h->root.type = bfd_link_hash_undefined;
821 h->root.u.undef.abfd = h->root.u.def.section->owner;
823 *size_change_ok = true;
824 *type_change_ok = true;
826 h->verinfo.vertree = NULL;
829 /* Handle the special case of a weak definition in a regular object
830 followed by a non-weak definition in a shared object. In this
831 case, we prefer the definition in the shared object unless it
832 comes from a DT_NEEDED entry of a shared object, in which case,
833 the DT_NEEDED entry may not be required at the run time. */
836 && h->root.type == bfd_link_hash_defweak
841 /* To make this work we have to frob the flags so that the rest
842 of the code does not think we are using the regular
844 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
845 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
846 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
847 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
848 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
849 | ELF_LINK_HASH_DEF_DYNAMIC);
851 /* If H is the target of an indirection, we want the caller to
852 use H rather than the indirect symbol. Otherwise if we are
853 defining a new indirect symbol we will wind up attaching it
854 to the entry we are overriding. */
858 /* Handle the special case of a non-weak definition in a shared
859 object followed by a weak definition in a regular object. In
860 this case we prefer to definition in the shared object. To make
861 this work we have to tell the caller to not treat the new symbol
865 && h->root.type != bfd_link_hash_defweak
874 /* Add symbols from an ELF object file to the linker hash table. */
877 elf_link_add_object_symbols (abfd, info)
879 struct bfd_link_info *info;
881 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
882 const Elf_Internal_Sym *,
883 const char **, flagword *,
884 asection **, bfd_vma *));
885 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
886 asection *, const Elf_Internal_Rela *));
888 Elf_Internal_Shdr *hdr;
892 Elf_External_Sym *buf = NULL;
893 struct elf_link_hash_entry **sym_hash;
895 bfd_byte *dynver = NULL;
896 Elf_External_Versym *extversym = NULL;
897 Elf_External_Versym *ever;
898 Elf_External_Dyn *dynbuf = NULL;
899 struct elf_link_hash_entry *weaks;
900 Elf_External_Sym *esym;
901 Elf_External_Sym *esymend;
902 struct elf_backend_data *bed;
905 bed = get_elf_backend_data (abfd);
906 add_symbol_hook = bed->elf_add_symbol_hook;
907 collect = bed->collect;
909 if ((abfd->flags & DYNAMIC) == 0)
915 /* You can't use -r against a dynamic object. Also, there's no
916 hope of using a dynamic object which does not exactly match
917 the format of the output file. */
918 if (info->relocateable || info->hash->creator != abfd->xvec)
920 bfd_set_error (bfd_error_invalid_operation);
925 /* As a GNU extension, any input sections which are named
926 .gnu.warning.SYMBOL are treated as warning symbols for the given
927 symbol. This differs from .gnu.warning sections, which generate
928 warnings when they are included in an output file. */
933 for (s = abfd->sections; s != NULL; s = s->next)
937 name = bfd_get_section_name (abfd, s);
938 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
943 name += sizeof ".gnu.warning." - 1;
945 /* If this is a shared object, then look up the symbol
946 in the hash table. If it is there, and it is already
947 been defined, then we will not be using the entry
948 from this shared object, so we don't need to warn.
949 FIXME: If we see the definition in a regular object
950 later on, we will warn, but we shouldn't. The only
951 fix is to keep track of what warnings we are supposed
952 to emit, and then handle them all at the end of the
954 if (dynamic && abfd->xvec == info->hash->creator)
956 struct elf_link_hash_entry *h;
958 h = elf_link_hash_lookup (elf_hash_table (info), name,
961 /* FIXME: What about bfd_link_hash_common? */
963 && (h->root.type == bfd_link_hash_defined
964 || h->root.type == bfd_link_hash_defweak))
966 /* We don't want to issue this warning. Clobber
967 the section size so that the warning does not
968 get copied into the output file. */
974 sz = bfd_section_size (abfd, s);
975 msg = (char *) bfd_alloc (abfd, sz + 1);
979 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
984 if (! (_bfd_generic_link_add_one_symbol
985 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
986 false, collect, (struct bfd_link_hash_entry **) NULL)))
989 if (! info->relocateable)
991 /* Clobber the section size so that the warning does
992 not get copied into the output file. */
999 /* If this is a dynamic object, we always link against the .dynsym
1000 symbol table, not the .symtab symbol table. The dynamic linker
1001 will only see the .dynsym symbol table, so there is no reason to
1002 look at .symtab for a dynamic object. */
1004 if (! dynamic || elf_dynsymtab (abfd) == 0)
1005 hdr = &elf_tdata (abfd)->symtab_hdr;
1007 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1011 /* Read in any version definitions. */
1013 if (! _bfd_elf_slurp_version_tables (abfd))
1016 /* Read in the symbol versions, but don't bother to convert them
1017 to internal format. */
1018 if (elf_dynversym (abfd) != 0)
1020 Elf_Internal_Shdr *versymhdr;
1022 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1023 extversym = (Elf_External_Versym *) bfd_malloc (hdr->sh_size);
1024 if (extversym == NULL)
1026 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1027 || (bfd_read ((PTR) extversym, 1, versymhdr->sh_size, abfd)
1028 != versymhdr->sh_size))
1033 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1035 /* The sh_info field of the symtab header tells us where the
1036 external symbols start. We don't care about the local symbols at
1038 if (elf_bad_symtab (abfd))
1040 extsymcount = symcount;
1045 extsymcount = symcount - hdr->sh_info;
1046 extsymoff = hdr->sh_info;
1049 buf = ((Elf_External_Sym *)
1050 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
1051 if (buf == NULL && extsymcount != 0)
1054 /* We store a pointer to the hash table entry for each external
1056 sym_hash = ((struct elf_link_hash_entry **)
1058 extsymcount * sizeof (struct elf_link_hash_entry *)));
1059 if (sym_hash == NULL)
1061 elf_sym_hashes (abfd) = sym_hash;
1067 /* If we are creating a shared library, create all the dynamic
1068 sections immediately. We need to attach them to something,
1069 so we attach them to this BFD, provided it is the right
1070 format. FIXME: If there are no input BFD's of the same
1071 format as the output, we can't make a shared library. */
1073 && ! elf_hash_table (info)->dynamic_sections_created
1074 && abfd->xvec == info->hash->creator)
1076 if (! elf_link_create_dynamic_sections (abfd, info))
1085 bfd_size_type oldsize;
1086 bfd_size_type strindex;
1088 /* Find the name to use in a DT_NEEDED entry that refers to this
1089 object. If the object has a DT_SONAME entry, we use it.
1090 Otherwise, if the generic linker stuck something in
1091 elf_dt_name, we use that. Otherwise, we just use the file
1092 name. If the generic linker put a null string into
1093 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1094 there is a DT_SONAME entry. */
1096 name = bfd_get_filename (abfd);
1097 if (elf_dt_name (abfd) != NULL)
1099 name = elf_dt_name (abfd);
1102 if (elf_dt_soname (abfd) != NULL)
1108 s = bfd_get_section_by_name (abfd, ".dynamic");
1111 Elf_External_Dyn *extdyn;
1112 Elf_External_Dyn *extdynend;
1118 dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
1122 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1123 (file_ptr) 0, s->_raw_size))
1126 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1129 link = elf_elfsections (abfd)[elfsec]->sh_link;
1132 /* The shared libraries distributed with hpux11 have a bogus
1133 sh_link field for the ".dynamic" section. This code detects
1134 when LINK refers to a section that is not a string table and
1135 tries to find the string table for the ".dynsym" section
1137 Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[link];
1138 if (hdr->sh_type != SHT_STRTAB)
1140 asection *s = bfd_get_section_by_name (abfd, ".dynsym");
1141 int elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1144 link = elf_elfsections (abfd)[elfsec]->sh_link;
1149 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1152 for (; extdyn < extdynend; extdyn++)
1154 Elf_Internal_Dyn dyn;
1156 elf_swap_dyn_in (abfd, extdyn, &dyn);
1157 if (dyn.d_tag == DT_SONAME)
1159 name = bfd_elf_string_from_elf_section (abfd, link,
1164 if (dyn.d_tag == DT_NEEDED)
1166 struct bfd_link_needed_list *n, **pn;
1169 n = ((struct bfd_link_needed_list *)
1170 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1171 fnm = bfd_elf_string_from_elf_section (abfd, link,
1173 if (n == NULL || fnm == NULL)
1175 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1182 for (pn = &elf_hash_table (info)->needed;
1188 if (dyn.d_tag == DT_RUNPATH)
1190 struct bfd_link_needed_list *n, **pn;
1193 /* When we see DT_RPATH before DT_RUNPATH, we have
1195 if (rpath && elf_hash_table (info)->runpath)
1197 struct bfd_link_needed_list *nn;
1198 for (n = elf_hash_table (info)->runpath;
1202 bfd_release (abfd, n);
1204 bfd_release (abfd, elf_hash_table (info)->runpath);
1205 elf_hash_table (info)->runpath = NULL;
1208 n = ((struct bfd_link_needed_list *)
1209 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1210 fnm = bfd_elf_string_from_elf_section (abfd, link,
1212 if (n == NULL || fnm == NULL)
1214 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1221 for (pn = &elf_hash_table (info)->runpath;
1229 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1230 if (!runpath && dyn.d_tag == DT_RPATH)
1232 struct bfd_link_needed_list *n, **pn;
1235 n = ((struct bfd_link_needed_list *)
1236 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1237 fnm = bfd_elf_string_from_elf_section (abfd, link,
1239 if (n == NULL || fnm == NULL)
1241 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1248 for (pn = &elf_hash_table (info)->runpath;
1261 /* We do not want to include any of the sections in a dynamic
1262 object in the output file. We hack by simply clobbering the
1263 list of sections in the BFD. This could be handled more
1264 cleanly by, say, a new section flag; the existing
1265 SEC_NEVER_LOAD flag is not the one we want, because that one
1266 still implies that the section takes up space in the output
1268 abfd->sections = NULL;
1269 abfd->section_count = 0;
1271 /* If this is the first dynamic object found in the link, create
1272 the special sections required for dynamic linking. */
1273 if (! elf_hash_table (info)->dynamic_sections_created)
1275 if (! elf_link_create_dynamic_sections (abfd, info))
1281 /* Add a DT_NEEDED entry for this dynamic object. */
1282 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1283 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
1285 if (strindex == (bfd_size_type) -1)
1288 if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1291 Elf_External_Dyn *dyncon, *dynconend;
1293 /* The hash table size did not change, which means that
1294 the dynamic object name was already entered. If we
1295 have already included this dynamic object in the
1296 link, just ignore it. There is no reason to include
1297 a particular dynamic object more than once. */
1298 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1300 BFD_ASSERT (sdyn != NULL);
1302 dyncon = (Elf_External_Dyn *) sdyn->contents;
1303 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1305 for (; dyncon < dynconend; dyncon++)
1307 Elf_Internal_Dyn dyn;
1309 elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
1311 if (dyn.d_tag == DT_NEEDED
1312 && dyn.d_un.d_val == strindex)
1316 if (extversym != NULL)
1323 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
1327 /* Save the SONAME, if there is one, because sometimes the
1328 linker emulation code will need to know it. */
1330 name = bfd_get_filename (abfd);
1331 elf_dt_name (abfd) = name;
1335 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
1337 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
1338 != extsymcount * sizeof (Elf_External_Sym)))
1343 ever = extversym != NULL ? extversym + extsymoff : NULL;
1344 esymend = buf + extsymcount;
1347 esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
1349 Elf_Internal_Sym sym;
1355 struct elf_link_hash_entry *h;
1357 boolean size_change_ok, type_change_ok;
1358 boolean new_weakdef;
1359 unsigned int old_alignment;
1361 elf_swap_symbol_in (abfd, esym, &sym);
1363 flags = BSF_NO_FLAGS;
1365 value = sym.st_value;
1368 bind = ELF_ST_BIND (sym.st_info);
1369 if (bind == STB_LOCAL)
1371 /* This should be impossible, since ELF requires that all
1372 global symbols follow all local symbols, and that sh_info
1373 point to the first global symbol. Unfortunatealy, Irix 5
1377 else if (bind == STB_GLOBAL)
1379 if (sym.st_shndx != SHN_UNDEF
1380 && sym.st_shndx != SHN_COMMON)
1385 else if (bind == STB_WEAK)
1389 /* Leave it up to the processor backend. */
1392 if (sym.st_shndx == SHN_UNDEF)
1393 sec = bfd_und_section_ptr;
1394 else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
1396 sec = section_from_elf_index (abfd, sym.st_shndx);
1398 sec = bfd_abs_section_ptr;
1399 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1402 else if (sym.st_shndx == SHN_ABS)
1403 sec = bfd_abs_section_ptr;
1404 else if (sym.st_shndx == SHN_COMMON)
1406 sec = bfd_com_section_ptr;
1407 /* What ELF calls the size we call the value. What ELF
1408 calls the value we call the alignment. */
1409 value = sym.st_size;
1413 /* Leave it up to the processor backend. */
1416 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
1417 if (name == (const char *) NULL)
1420 if (add_symbol_hook)
1422 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
1426 /* The hook function sets the name to NULL if this symbol
1427 should be skipped for some reason. */
1428 if (name == (const char *) NULL)
1432 /* Sanity check that all possibilities were handled. */
1433 if (sec == (asection *) NULL)
1435 bfd_set_error (bfd_error_bad_value);
1439 if (bfd_is_und_section (sec)
1440 || bfd_is_com_section (sec))
1445 size_change_ok = false;
1446 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1448 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1450 Elf_Internal_Versym iver;
1451 unsigned int vernum = 0;
1456 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1457 vernum = iver.vs_vers & VERSYM_VERSION;
1459 /* If this is a hidden symbol, or if it is not version
1460 1, we append the version name to the symbol name.
1461 However, we do not modify a non-hidden absolute
1462 symbol, because it might be the version symbol
1463 itself. FIXME: What if it isn't? */
1464 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1465 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1468 int namelen, newlen;
1471 if (sym.st_shndx != SHN_UNDEF)
1473 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1475 (*_bfd_error_handler)
1476 (_("%s: %s: invalid version %u (max %d)"),
1477 bfd_get_filename (abfd), name, vernum,
1478 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1479 bfd_set_error (bfd_error_bad_value);
1482 else if (vernum > 1)
1484 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1490 /* We cannot simply test for the number of
1491 entries in the VERNEED section since the
1492 numbers for the needed versions do not start
1494 Elf_Internal_Verneed *t;
1497 for (t = elf_tdata (abfd)->verref;
1501 Elf_Internal_Vernaux *a;
1503 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1505 if (a->vna_other == vernum)
1507 verstr = a->vna_nodename;
1516 (*_bfd_error_handler)
1517 (_("%s: %s: invalid needed version %d"),
1518 bfd_get_filename (abfd), name, vernum);
1519 bfd_set_error (bfd_error_bad_value);
1524 namelen = strlen (name);
1525 newlen = namelen + strlen (verstr) + 2;
1526 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1529 newname = (char *) bfd_alloc (abfd, newlen);
1530 if (newname == NULL)
1532 strcpy (newname, name);
1533 p = newname + namelen;
1535 /* If this is a defined non-hidden version symbol,
1536 we add another @ to the name. This indicates the
1537 default version of the symbol. */
1538 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1539 && sym.st_shndx != SHN_UNDEF)
1547 if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
1548 sym_hash, &override, &type_change_ok,
1549 &size_change_ok, dt_needed))
1556 while (h->root.type == bfd_link_hash_indirect
1557 || h->root.type == bfd_link_hash_warning)
1558 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1560 /* Remember the old alignment if this is a common symbol, so
1561 that we don't reduce the alignment later on. We can't
1562 check later, because _bfd_generic_link_add_one_symbol
1563 will set a default for the alignment which we want to
1565 if (h->root.type == bfd_link_hash_common)
1566 old_alignment = h->root.u.c.p->alignment_power;
1568 if (elf_tdata (abfd)->verdef != NULL
1572 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1575 if (! (_bfd_generic_link_add_one_symbol
1576 (info, abfd, name, flags, sec, value, (const char *) NULL,
1577 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1581 while (h->root.type == bfd_link_hash_indirect
1582 || h->root.type == bfd_link_hash_warning)
1583 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1586 new_weakdef = false;
1589 && (flags & BSF_WEAK) != 0
1590 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
1591 && info->hash->creator->flavour == bfd_target_elf_flavour
1592 && h->weakdef == NULL)
1594 /* Keep a list of all weak defined non function symbols from
1595 a dynamic object, using the weakdef field. Later in this
1596 function we will set the weakdef field to the correct
1597 value. We only put non-function symbols from dynamic
1598 objects on this list, because that happens to be the only
1599 time we need to know the normal symbol corresponding to a
1600 weak symbol, and the information is time consuming to
1601 figure out. If the weakdef field is not already NULL,
1602 then this symbol was already defined by some previous
1603 dynamic object, and we will be using that previous
1604 definition anyhow. */
1611 /* Set the alignment of a common symbol. */
1612 if (sym.st_shndx == SHN_COMMON
1613 && h->root.type == bfd_link_hash_common)
1617 align = bfd_log2 (sym.st_value);
1618 if (align > old_alignment)
1619 h->root.u.c.p->alignment_power = align;
1622 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1628 /* Remember the symbol size and type. */
1629 if (sym.st_size != 0
1630 && (definition || h->size == 0))
1632 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
1633 (*_bfd_error_handler)
1634 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1635 name, (unsigned long) h->size, (unsigned long) sym.st_size,
1636 bfd_get_filename (abfd));
1638 h->size = sym.st_size;
1641 /* If this is a common symbol, then we always want H->SIZE
1642 to be the size of the common symbol. The code just above
1643 won't fix the size if a common symbol becomes larger. We
1644 don't warn about a size change here, because that is
1645 covered by --warn-common. */
1646 if (h->root.type == bfd_link_hash_common)
1647 h->size = h->root.u.c.size;
1649 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
1650 && (definition || h->type == STT_NOTYPE))
1652 if (h->type != STT_NOTYPE
1653 && h->type != ELF_ST_TYPE (sym.st_info)
1654 && ! type_change_ok)
1655 (*_bfd_error_handler)
1656 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1657 name, h->type, ELF_ST_TYPE (sym.st_info),
1658 bfd_get_filename (abfd));
1660 h->type = ELF_ST_TYPE (sym.st_info);
1663 /* If st_other has a processor-specific meaning, specific code
1664 might be needed here. */
1665 if (sym.st_other != 0)
1667 /* Combine visibilities, using the most constraining one. */
1668 unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1669 unsigned char symvis = ELF_ST_VISIBILITY (sym.st_other);
1671 if (symvis && (hvis > symvis || hvis == 0))
1672 h->other = sym.st_other;
1674 /* If neither has visibility, use the st_other of the
1675 definition. This is an arbitrary choice, since the
1676 other bits have no general meaning. */
1677 if (!symvis && !hvis
1678 && (definition || h->other == 0))
1679 h->other = sym.st_other;
1682 /* Set a flag in the hash table entry indicating the type of
1683 reference or definition we just found. Keep a count of
1684 the number of dynamic symbols we find. A dynamic symbol
1685 is one which is referenced or defined by both a regular
1686 object and a shared object. */
1687 old_flags = h->elf_link_hash_flags;
1693 new_flag = ELF_LINK_HASH_REF_REGULAR;
1694 if (bind != STB_WEAK)
1695 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
1698 new_flag = ELF_LINK_HASH_DEF_REGULAR;
1700 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1701 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
1707 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
1709 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
1710 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
1711 | ELF_LINK_HASH_REF_REGULAR)) != 0
1712 || (h->weakdef != NULL
1714 && h->weakdef->dynindx != -1))
1718 h->elf_link_hash_flags |= new_flag;
1720 /* If this symbol has a version, and it is the default
1721 version, we create an indirect symbol from the default
1722 name to the fully decorated name. This will cause
1723 external references which do not specify a version to be
1724 bound to this version of the symbol. */
1729 p = strchr (name, ELF_VER_CHR);
1730 if (p != NULL && p[1] == ELF_VER_CHR)
1733 struct elf_link_hash_entry *hi;
1736 shortname = bfd_hash_allocate (&info->hash->table,
1738 if (shortname == NULL)
1740 strncpy (shortname, name, p - name);
1741 shortname[p - name] = '\0';
1743 /* We are going to create a new symbol. Merge it
1744 with any existing symbol with this name. For the
1745 purposes of the merge, act as though we were
1746 defining the symbol we just defined, although we
1747 actually going to define an indirect symbol. */
1748 type_change_ok = false;
1749 size_change_ok = false;
1750 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1751 &value, &hi, &override,
1753 &size_change_ok, dt_needed))
1758 if (! (_bfd_generic_link_add_one_symbol
1759 (info, abfd, shortname, BSF_INDIRECT,
1760 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1761 collect, (struct bfd_link_hash_entry **) &hi)))
1766 /* In this case the symbol named SHORTNAME is
1767 overriding the indirect symbol we want to
1768 add. We were planning on making SHORTNAME an
1769 indirect symbol referring to NAME. SHORTNAME
1770 is the name without a version. NAME is the
1771 fully versioned name, and it is the default
1774 Overriding means that we already saw a
1775 definition for the symbol SHORTNAME in a
1776 regular object, and it is overriding the
1777 symbol defined in the dynamic object.
1779 When this happens, we actually want to change
1780 NAME, the symbol we just added, to refer to
1781 SHORTNAME. This will cause references to
1782 NAME in the shared object to become
1783 references to SHORTNAME in the regular
1784 object. This is what we expect when we
1785 override a function in a shared object: that
1786 the references in the shared object will be
1787 mapped to the definition in the regular
1790 while (hi->root.type == bfd_link_hash_indirect
1791 || hi->root.type == bfd_link_hash_warning)
1792 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1794 h->root.type = bfd_link_hash_indirect;
1795 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1796 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1798 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1799 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1800 if (hi->elf_link_hash_flags
1801 & (ELF_LINK_HASH_REF_REGULAR
1802 | ELF_LINK_HASH_DEF_REGULAR))
1804 if (! _bfd_elf_link_record_dynamic_symbol (info,
1810 /* Now set HI to H, so that the following code
1811 will set the other fields correctly. */
1815 /* If there is a duplicate definition somewhere,
1816 then HI may not point to an indirect symbol. We
1817 will have reported an error to the user in that
1820 if (hi->root.type == bfd_link_hash_indirect)
1822 struct elf_link_hash_entry *ht;
1824 /* If the symbol became indirect, then we assume
1825 that we have not seen a definition before. */
1826 BFD_ASSERT ((hi->elf_link_hash_flags
1827 & (ELF_LINK_HASH_DEF_DYNAMIC
1828 | ELF_LINK_HASH_DEF_REGULAR))
1831 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1832 (*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1834 /* See if the new flags lead us to realize that
1835 the symbol must be dynamic. */
1841 || ((hi->elf_link_hash_flags
1842 & ELF_LINK_HASH_REF_DYNAMIC)
1848 if ((hi->elf_link_hash_flags
1849 & ELF_LINK_HASH_REF_REGULAR) != 0)
1855 /* We also need to define an indirection from the
1856 nondefault version of the symbol. */
1858 shortname = bfd_hash_allocate (&info->hash->table,
1860 if (shortname == NULL)
1862 strncpy (shortname, name, p - name);
1863 strcpy (shortname + (p - name), p + 1);
1865 /* Once again, merge with any existing symbol. */
1866 type_change_ok = false;
1867 size_change_ok = false;
1868 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1869 &value, &hi, &override,
1871 &size_change_ok, dt_needed))
1876 /* Here SHORTNAME is a versioned name, so we
1877 don't expect to see the type of override we
1878 do in the case above. */
1879 (*_bfd_error_handler)
1880 (_("%s: warning: unexpected redefinition of `%s'"),
1881 bfd_get_filename (abfd), shortname);
1885 if (! (_bfd_generic_link_add_one_symbol
1886 (info, abfd, shortname, BSF_INDIRECT,
1887 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1888 collect, (struct bfd_link_hash_entry **) &hi)))
1891 /* If there is a duplicate definition somewhere,
1892 then HI may not point to an indirect symbol.
1893 We will have reported an error to the user in
1896 if (hi->root.type == bfd_link_hash_indirect)
1898 /* If the symbol became indirect, then we
1899 assume that we have not seen a definition
1901 BFD_ASSERT ((hi->elf_link_hash_flags
1902 & (ELF_LINK_HASH_DEF_DYNAMIC
1903 | ELF_LINK_HASH_DEF_REGULAR))
1906 (*bed->elf_backend_copy_indirect_symbol) (h, hi);
1908 /* See if the new flags lead us to realize
1909 that the symbol must be dynamic. */
1915 || ((hi->elf_link_hash_flags
1916 & ELF_LINK_HASH_REF_DYNAMIC)
1922 if ((hi->elf_link_hash_flags
1923 & ELF_LINK_HASH_REF_REGULAR) != 0)
1932 if (dynsym && h->dynindx == -1)
1934 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1936 if (h->weakdef != NULL
1938 && h->weakdef->dynindx == -1)
1940 if (! _bfd_elf_link_record_dynamic_symbol (info,
1945 else if (dynsym && h->dynindx != -1)
1946 /* If the symbol already has a dynamic index, but
1947 visibility says it should not be visible, turn it into
1949 switch (ELF_ST_VISIBILITY (h->other))
1953 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
1954 (*bed->elf_backend_hide_symbol) (info, h);
1958 if (dt_needed && definition
1959 && (h->elf_link_hash_flags
1960 & ELF_LINK_HASH_REF_REGULAR) != 0)
1962 bfd_size_type oldsize;
1963 bfd_size_type strindex;
1965 /* The symbol from a DT_NEEDED object is referenced from
1966 the regular object to create a dynamic executable. We
1967 have to make sure there is a DT_NEEDED entry for it. */
1970 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1971 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
1972 elf_dt_soname (abfd),
1974 if (strindex == (bfd_size_type) -1)
1978 == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1981 Elf_External_Dyn *dyncon, *dynconend;
1983 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1985 BFD_ASSERT (sdyn != NULL);
1987 dyncon = (Elf_External_Dyn *) sdyn->contents;
1988 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1990 for (; dyncon < dynconend; dyncon++)
1992 Elf_Internal_Dyn dyn;
1994 elf_swap_dyn_in (elf_hash_table (info)->dynobj,
1996 BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
1997 dyn.d_un.d_val != strindex);
2001 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
2007 /* Now set the weakdefs field correctly for all the weak defined
2008 symbols we found. The only way to do this is to search all the
2009 symbols. Since we only need the information for non functions in
2010 dynamic objects, that's the only time we actually put anything on
2011 the list WEAKS. We need this information so that if a regular
2012 object refers to a symbol defined weakly in a dynamic object, the
2013 real symbol in the dynamic object is also put in the dynamic
2014 symbols; we also must arrange for both symbols to point to the
2015 same memory location. We could handle the general case of symbol
2016 aliasing, but a general symbol alias can only be generated in
2017 assembler code, handling it correctly would be very time
2018 consuming, and other ELF linkers don't handle general aliasing
2020 while (weaks != NULL)
2022 struct elf_link_hash_entry *hlook;
2025 struct elf_link_hash_entry **hpp;
2026 struct elf_link_hash_entry **hppend;
2029 weaks = hlook->weakdef;
2030 hlook->weakdef = NULL;
2032 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2033 || hlook->root.type == bfd_link_hash_defweak
2034 || hlook->root.type == bfd_link_hash_common
2035 || hlook->root.type == bfd_link_hash_indirect);
2036 slook = hlook->root.u.def.section;
2037 vlook = hlook->root.u.def.value;
2039 hpp = elf_sym_hashes (abfd);
2040 hppend = hpp + extsymcount;
2041 for (; hpp < hppend; hpp++)
2043 struct elf_link_hash_entry *h;
2046 if (h != NULL && h != hlook
2047 && h->root.type == bfd_link_hash_defined
2048 && h->root.u.def.section == slook
2049 && h->root.u.def.value == vlook)
2053 /* If the weak definition is in the list of dynamic
2054 symbols, make sure the real definition is put there
2056 if (hlook->dynindx != -1
2057 && h->dynindx == -1)
2059 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2063 /* If the real definition is in the list of dynamic
2064 symbols, make sure the weak definition is put there
2065 as well. If we don't do this, then the dynamic
2066 loader might not merge the entries for the real
2067 definition and the weak definition. */
2068 if (h->dynindx != -1
2069 && hlook->dynindx == -1)
2071 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2086 if (extversym != NULL)
2092 /* If this object is the same format as the output object, and it is
2093 not a shared library, then let the backend look through the
2096 This is required to build global offset table entries and to
2097 arrange for dynamic relocs. It is not required for the
2098 particular common case of linking non PIC code, even when linking
2099 against shared libraries, but unfortunately there is no way of
2100 knowing whether an object file has been compiled PIC or not.
2101 Looking through the relocs is not particularly time consuming.
2102 The problem is that we must either (1) keep the relocs in memory,
2103 which causes the linker to require additional runtime memory or
2104 (2) read the relocs twice from the input file, which wastes time.
2105 This would be a good case for using mmap.
2107 I have no idea how to handle linking PIC code into a file of a
2108 different format. It probably can't be done. */
2109 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2111 && abfd->xvec == info->hash->creator
2112 && check_relocs != NULL)
2116 for (o = abfd->sections; o != NULL; o = o->next)
2118 Elf_Internal_Rela *internal_relocs;
2121 if ((o->flags & SEC_RELOC) == 0
2122 || o->reloc_count == 0
2123 || ((info->strip == strip_all || info->strip == strip_debugger)
2124 && (o->flags & SEC_DEBUGGING) != 0)
2125 || bfd_is_abs_section (o->output_section))
2128 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2129 (abfd, o, (PTR) NULL,
2130 (Elf_Internal_Rela *) NULL,
2131 info->keep_memory));
2132 if (internal_relocs == NULL)
2135 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2137 if (! info->keep_memory)
2138 free (internal_relocs);
2145 /* If this is a non-traditional, non-relocateable link, try to
2146 optimize the handling of the .stab/.stabstr sections. */
2148 && ! info->relocateable
2149 && ! info->traditional_format
2150 && info->hash->creator->flavour == bfd_target_elf_flavour
2151 && (info->strip != strip_all && info->strip != strip_debugger))
2153 asection *stab, *stabstr;
2155 stab = bfd_get_section_by_name (abfd, ".stab");
2158 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2160 if (stabstr != NULL)
2162 struct bfd_elf_section_data *secdata;
2164 secdata = elf_section_data (stab);
2165 if (! _bfd_link_section_stabs (abfd,
2166 &elf_hash_table (info)->stab_info,
2168 &secdata->stab_info))
2183 if (extversym != NULL)
2188 /* Create some sections which will be filled in with dynamic linking
2189 information. ABFD is an input file which requires dynamic sections
2190 to be created. The dynamic sections take up virtual memory space
2191 when the final executable is run, so we need to create them before
2192 addresses are assigned to the output sections. We work out the
2193 actual contents and size of these sections later. */
2196 elf_link_create_dynamic_sections (abfd, info)
2198 struct bfd_link_info *info;
2201 register asection *s;
2202 struct elf_link_hash_entry *h;
2203 struct elf_backend_data *bed;
2205 if (elf_hash_table (info)->dynamic_sections_created)
2208 /* Make sure that all dynamic sections use the same input BFD. */
2209 if (elf_hash_table (info)->dynobj == NULL)
2210 elf_hash_table (info)->dynobj = abfd;
2212 abfd = elf_hash_table (info)->dynobj;
2214 /* Note that we set the SEC_IN_MEMORY flag for all of these
2216 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2217 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2219 /* A dynamically linked executable has a .interp section, but a
2220 shared library does not. */
2223 s = bfd_make_section (abfd, ".interp");
2225 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2229 /* Create sections to hold version informations. These are removed
2230 if they are not needed. */
2231 s = bfd_make_section (abfd, ".gnu.version_d");
2233 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2234 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2237 s = bfd_make_section (abfd, ".gnu.version");
2239 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2240 || ! bfd_set_section_alignment (abfd, s, 1))
2243 s = bfd_make_section (abfd, ".gnu.version_r");
2245 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2246 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2249 s = bfd_make_section (abfd, ".dynsym");
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, ".dynstr");
2257 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2260 /* Create a strtab to hold the dynamic symbol names. */
2261 if (elf_hash_table (info)->dynstr == NULL)
2263 elf_hash_table (info)->dynstr = elf_stringtab_init ();
2264 if (elf_hash_table (info)->dynstr == NULL)
2268 s = bfd_make_section (abfd, ".dynamic");
2270 || ! bfd_set_section_flags (abfd, s, flags)
2271 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2274 /* The special symbol _DYNAMIC is always set to the start of the
2275 .dynamic section. This call occurs before we have processed the
2276 symbols for any dynamic object, so we don't have to worry about
2277 overriding a dynamic definition. We could set _DYNAMIC in a
2278 linker script, but we only want to define it if we are, in fact,
2279 creating a .dynamic section. We don't want to define it if there
2280 is no .dynamic section, since on some ELF platforms the start up
2281 code examines it to decide how to initialize the process. */
2283 if (! (_bfd_generic_link_add_one_symbol
2284 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2285 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2286 (struct bfd_link_hash_entry **) &h)))
2288 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2289 h->type = STT_OBJECT;
2292 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2295 bed = get_elf_backend_data (abfd);
2297 s = bfd_make_section (abfd, ".hash");
2299 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2300 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2302 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2304 /* Let the backend create the rest of the sections. This lets the
2305 backend set the right flags. The backend will normally create
2306 the .got and .plt sections. */
2307 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2310 elf_hash_table (info)->dynamic_sections_created = true;
2315 /* Add an entry to the .dynamic table. */
2318 elf_add_dynamic_entry (info, tag, val)
2319 struct bfd_link_info *info;
2323 Elf_Internal_Dyn dyn;
2327 bfd_byte *newcontents;
2329 dynobj = elf_hash_table (info)->dynobj;
2331 s = bfd_get_section_by_name (dynobj, ".dynamic");
2332 BFD_ASSERT (s != NULL);
2334 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2335 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2336 if (newcontents == NULL)
2340 dyn.d_un.d_val = val;
2341 elf_swap_dyn_out (dynobj, &dyn,
2342 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2344 s->_raw_size = newsize;
2345 s->contents = newcontents;
2350 /* Record a new local dynamic symbol. */
2353 elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2354 struct bfd_link_info *info;
2358 struct elf_link_local_dynamic_entry *entry;
2359 struct elf_link_hash_table *eht;
2360 struct bfd_strtab_hash *dynstr;
2361 Elf_External_Sym esym;
2362 unsigned long dynstr_index;
2365 /* See if the entry exists already. */
2366 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2367 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2370 entry = (struct elf_link_local_dynamic_entry *)
2371 bfd_alloc (input_bfd, sizeof (*entry));
2375 /* Go find the symbol, so that we can find it's name. */
2376 if (bfd_seek (input_bfd,
2377 (elf_tdata (input_bfd)->symtab_hdr.sh_offset
2378 + input_indx * sizeof (Elf_External_Sym)),
2380 || (bfd_read (&esym, sizeof (Elf_External_Sym), 1, input_bfd)
2381 != sizeof (Elf_External_Sym)))
2383 elf_swap_symbol_in (input_bfd, &esym, &entry->isym);
2385 name = (bfd_elf_string_from_elf_section
2386 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2387 entry->isym.st_name));
2389 dynstr = elf_hash_table (info)->dynstr;
2392 /* Create a strtab to hold the dynamic symbol names. */
2393 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_stringtab_init ();
2398 dynstr_index = _bfd_stringtab_add (dynstr, name, true, false);
2399 if (dynstr_index == (unsigned long) -1)
2401 entry->isym.st_name = dynstr_index;
2403 eht = elf_hash_table (info);
2405 entry->next = eht->dynlocal;
2406 eht->dynlocal = entry;
2407 entry->input_bfd = input_bfd;
2408 entry->input_indx = input_indx;
2411 /* Whatever binding the symbol had before, it's now local. */
2413 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2415 /* The dynindx will be set at the end of size_dynamic_sections. */
2421 /* Read and swap the relocs from the section indicated by SHDR. This
2422 may be either a REL or a RELA section. The relocations are
2423 translated into RELA relocations and stored in INTERNAL_RELOCS,
2424 which should have already been allocated to contain enough space.
2425 The EXTERNAL_RELOCS are a buffer where the external form of the
2426 relocations should be stored.
2428 Returns false if something goes wrong. */
2431 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2434 Elf_Internal_Shdr *shdr;
2435 PTR external_relocs;
2436 Elf_Internal_Rela *internal_relocs;
2438 struct elf_backend_data *bed;
2440 /* If there aren't any relocations, that's OK. */
2444 /* Position ourselves at the start of the section. */
2445 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2448 /* Read the relocations. */
2449 if (bfd_read (external_relocs, 1, shdr->sh_size, abfd)
2453 bed = get_elf_backend_data (abfd);
2455 /* Convert the external relocations to the internal format. */
2456 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2458 Elf_External_Rel *erel;
2459 Elf_External_Rel *erelend;
2460 Elf_Internal_Rela *irela;
2461 Elf_Internal_Rel *irel;
2463 erel = (Elf_External_Rel *) external_relocs;
2464 erelend = erel + shdr->sh_size / shdr->sh_entsize;
2465 irela = internal_relocs;
2466 irel = bfd_alloc (abfd, (bed->s->int_rels_per_ext_rel
2467 * sizeof (Elf_Internal_Rel)));
2468 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2472 if (bed->s->swap_reloc_in)
2473 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2475 elf_swap_reloc_in (abfd, erel, irel);
2477 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2479 irela[i].r_offset = irel[i].r_offset;
2480 irela[i].r_info = irel[i].r_info;
2481 irela[i].r_addend = 0;
2487 Elf_External_Rela *erela;
2488 Elf_External_Rela *erelaend;
2489 Elf_Internal_Rela *irela;
2491 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2493 erela = (Elf_External_Rela *) external_relocs;
2494 erelaend = erela + shdr->sh_size / shdr->sh_entsize;
2495 irela = internal_relocs;
2496 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2498 if (bed->s->swap_reloca_in)
2499 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2501 elf_swap_reloca_in (abfd, erela, irela);
2508 /* Read and swap the relocs for a section O. They may have been
2509 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2510 not NULL, they are used as buffers to read into. They are known to
2511 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2512 the return value is allocated using either malloc or bfd_alloc,
2513 according to the KEEP_MEMORY argument. If O has two relocation
2514 sections (both REL and RELA relocations), then the REL_HDR
2515 relocations will appear first in INTERNAL_RELOCS, followed by the
2516 REL_HDR2 relocations. */
2519 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2523 PTR external_relocs;
2524 Elf_Internal_Rela *internal_relocs;
2525 boolean keep_memory;
2527 Elf_Internal_Shdr *rel_hdr;
2529 Elf_Internal_Rela *alloc2 = NULL;
2530 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2532 if (elf_section_data (o)->relocs != NULL)
2533 return elf_section_data (o)->relocs;
2535 if (o->reloc_count == 0)
2538 rel_hdr = &elf_section_data (o)->rel_hdr;
2540 if (internal_relocs == NULL)
2544 size = (o->reloc_count * bed->s->int_rels_per_ext_rel
2545 * sizeof (Elf_Internal_Rela));
2547 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2549 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2550 if (internal_relocs == NULL)
2554 if (external_relocs == NULL)
2556 size_t size = (size_t) rel_hdr->sh_size;
2558 if (elf_section_data (o)->rel_hdr2)
2559 size += (size_t) elf_section_data (o)->rel_hdr2->sh_size;
2560 alloc1 = (PTR) bfd_malloc (size);
2563 external_relocs = alloc1;
2566 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2570 if (!elf_link_read_relocs_from_section
2572 elf_section_data (o)->rel_hdr2,
2573 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2574 internal_relocs + (rel_hdr->sh_size / rel_hdr->sh_entsize
2575 * bed->s->int_rels_per_ext_rel)))
2578 /* Cache the results for next time, if we can. */
2580 elf_section_data (o)->relocs = internal_relocs;
2585 /* Don't free alloc2, since if it was allocated we are passing it
2586 back (under the name of internal_relocs). */
2588 return internal_relocs;
2599 /* Record an assignment to a symbol made by a linker script. We need
2600 this in case some dynamic object refers to this symbol. */
2604 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2605 bfd *output_bfd ATTRIBUTE_UNUSED;
2606 struct bfd_link_info *info;
2610 struct elf_link_hash_entry *h;
2612 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2615 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2619 if (h->root.type == bfd_link_hash_new)
2620 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
2622 /* If this symbol is being provided by the linker script, and it is
2623 currently defined by a dynamic object, but not by a regular
2624 object, then mark it as undefined so that the generic linker will
2625 force the correct value. */
2627 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2628 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2629 h->root.type = bfd_link_hash_undefined;
2631 /* If this symbol is not being provided by the linker script, and it is
2632 currently defined by a dynamic object, but not by a regular object,
2633 then clear out any version information because the symbol will not be
2634 associated with the dynamic object any more. */
2636 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2637 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2638 h->verinfo.verdef = NULL;
2640 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2642 /* When possible, keep the original type of the symbol */
2643 if (h->type == STT_NOTYPE)
2644 h->type = STT_OBJECT;
2646 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2647 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2649 && h->dynindx == -1)
2651 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2654 /* If this is a weak defined symbol, and we know a corresponding
2655 real symbol from the same dynamic object, make sure the real
2656 symbol is also made into a dynamic symbol. */
2657 if (h->weakdef != NULL
2658 && h->weakdef->dynindx == -1)
2660 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2668 /* This structure is used to pass information to
2669 elf_link_assign_sym_version. */
2671 struct elf_assign_sym_version_info
2675 /* General link information. */
2676 struct bfd_link_info *info;
2678 struct bfd_elf_version_tree *verdefs;
2679 /* Whether we are exporting all dynamic symbols. */
2680 boolean export_dynamic;
2681 /* Whether we had a failure. */
2685 /* This structure is used to pass information to
2686 elf_link_find_version_dependencies. */
2688 struct elf_find_verdep_info
2692 /* General link information. */
2693 struct bfd_link_info *info;
2694 /* The number of dependencies. */
2696 /* Whether we had a failure. */
2700 /* Array used to determine the number of hash table buckets to use
2701 based on the number of symbols there are. If there are fewer than
2702 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2703 fewer than 37 we use 17 buckets, and so forth. We never use more
2704 than 32771 buckets. */
2706 static const size_t elf_buckets[] =
2708 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2712 /* Compute bucket count for hashing table. We do not use a static set
2713 of possible tables sizes anymore. Instead we determine for all
2714 possible reasonable sizes of the table the outcome (i.e., the
2715 number of collisions etc) and choose the best solution. The
2716 weighting functions are not too simple to allow the table to grow
2717 without bounds. Instead one of the weighting factors is the size.
2718 Therefore the result is always a good payoff between few collisions
2719 (= short chain lengths) and table size. */
2721 compute_bucket_count (info)
2722 struct bfd_link_info *info;
2724 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2725 size_t best_size = 0;
2726 unsigned long int *hashcodes;
2727 unsigned long int *hashcodesp;
2728 unsigned long int i;
2730 /* Compute the hash values for all exported symbols. At the same
2731 time store the values in an array so that we could use them for
2733 hashcodes = (unsigned long int *) bfd_malloc (dynsymcount
2734 * sizeof (unsigned long int));
2735 if (hashcodes == NULL)
2737 hashcodesp = hashcodes;
2739 /* Put all hash values in HASHCODES. */
2740 elf_link_hash_traverse (elf_hash_table (info),
2741 elf_collect_hash_codes, &hashcodesp);
2743 /* We have a problem here. The following code to optimize the table
2744 size requires an integer type with more the 32 bits. If
2745 BFD_HOST_U_64_BIT is set we know about such a type. */
2746 #ifdef BFD_HOST_U_64_BIT
2747 if (info->optimize == true)
2749 unsigned long int nsyms = hashcodesp - hashcodes;
2752 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2753 unsigned long int *counts ;
2755 /* Possible optimization parameters: if we have NSYMS symbols we say
2756 that the hashing table must at least have NSYMS/4 and at most
2758 minsize = nsyms / 4;
2761 best_size = maxsize = nsyms * 2;
2763 /* Create array where we count the collisions in. We must use bfd_malloc
2764 since the size could be large. */
2765 counts = (unsigned long int *) bfd_malloc (maxsize
2766 * sizeof (unsigned long int));
2773 /* Compute the "optimal" size for the hash table. The criteria is a
2774 minimal chain length. The minor criteria is (of course) the size
2776 for (i = minsize; i < maxsize; ++i)
2778 /* Walk through the array of hashcodes and count the collisions. */
2779 BFD_HOST_U_64_BIT max;
2780 unsigned long int j;
2781 unsigned long int fact;
2783 memset (counts, '\0', i * sizeof (unsigned long int));
2785 /* Determine how often each hash bucket is used. */
2786 for (j = 0; j < nsyms; ++j)
2787 ++counts[hashcodes[j] % i];
2789 /* For the weight function we need some information about the
2790 pagesize on the target. This is information need not be 100%
2791 accurate. Since this information is not available (so far) we
2792 define it here to a reasonable default value. If it is crucial
2793 to have a better value some day simply define this value. */
2794 # ifndef BFD_TARGET_PAGESIZE
2795 # define BFD_TARGET_PAGESIZE (4096)
2798 /* We in any case need 2 + NSYMS entries for the size values and
2800 max = (2 + nsyms) * (ARCH_SIZE / 8);
2803 /* Variant 1: optimize for short chains. We add the squares
2804 of all the chain lengths (which favous many small chain
2805 over a few long chains). */
2806 for (j = 0; j < i; ++j)
2807 max += counts[j] * counts[j];
2809 /* This adds penalties for the overall size of the table. */
2810 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2813 /* Variant 2: Optimize a lot more for small table. Here we
2814 also add squares of the size but we also add penalties for
2815 empty slots (the +1 term). */
2816 for (j = 0; j < i; ++j)
2817 max += (1 + counts[j]) * (1 + counts[j]);
2819 /* The overall size of the table is considered, but not as
2820 strong as in variant 1, where it is squared. */
2821 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2825 /* Compare with current best results. */
2826 if (max < best_chlen)
2836 #endif /* defined (BFD_HOST_U_64_BIT) */
2838 /* This is the fallback solution if no 64bit type is available or if we
2839 are not supposed to spend much time on optimizations. We select the
2840 bucket count using a fixed set of numbers. */
2841 for (i = 0; elf_buckets[i] != 0; i++)
2843 best_size = elf_buckets[i];
2844 if (dynsymcount < elf_buckets[i + 1])
2849 /* Free the arrays we needed. */
2855 /* Set up the sizes and contents of the ELF dynamic sections. This is
2856 called by the ELF linker emulation before_allocation routine. We
2857 must set the sizes of the sections before the linker sets the
2858 addresses of the various sections. */
2861 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
2862 export_dynamic, filter_shlib,
2863 auxiliary_filters, info, sinterpptr,
2868 boolean export_dynamic;
2869 const char *filter_shlib;
2870 const char * const *auxiliary_filters;
2871 struct bfd_link_info *info;
2872 asection **sinterpptr;
2873 struct bfd_elf_version_tree *verdefs;
2875 bfd_size_type soname_indx;
2877 struct elf_backend_data *bed;
2878 struct elf_assign_sym_version_info asvinfo;
2882 soname_indx = (bfd_size_type) -1;
2884 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2887 /* The backend may have to create some sections regardless of whether
2888 we're dynamic or not. */
2889 bed = get_elf_backend_data (output_bfd);
2890 if (bed->elf_backend_always_size_sections
2891 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
2894 dynobj = elf_hash_table (info)->dynobj;
2896 /* If there were no dynamic objects in the link, there is nothing to
2901 if (elf_hash_table (info)->dynamic_sections_created)
2903 struct elf_info_failed eif;
2904 struct elf_link_hash_entry *h;
2905 bfd_size_type strsize;
2907 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
2908 BFD_ASSERT (*sinterpptr != NULL || info->shared);
2912 soname_indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2913 soname, true, true);
2914 if (soname_indx == (bfd_size_type) -1
2915 || ! elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
2921 if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
2923 info->flags |= DF_SYMBOLIC;
2930 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
2932 if (indx == (bfd_size_type) -1
2933 || ! elf_add_dynamic_entry (info, DT_RPATH, indx)
2935 && ! elf_add_dynamic_entry (info, DT_RUNPATH, indx)))
2939 if (filter_shlib != NULL)
2943 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2944 filter_shlib, true, true);
2945 if (indx == (bfd_size_type) -1
2946 || ! elf_add_dynamic_entry (info, DT_FILTER, indx))
2950 if (auxiliary_filters != NULL)
2952 const char * const *p;
2954 for (p = auxiliary_filters; *p != NULL; p++)
2958 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2960 if (indx == (bfd_size_type) -1
2961 || ! elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
2966 /* If we are supposed to export all symbols into the dynamic symbol
2967 table (this is not the normal case), then do so. */
2970 struct elf_info_failed eif;
2974 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
2980 /* Attach all the symbols to their version information. */
2981 asvinfo.output_bfd = output_bfd;
2982 asvinfo.info = info;
2983 asvinfo.verdefs = verdefs;
2984 asvinfo.export_dynamic = export_dynamic;
2985 asvinfo.failed = false;
2987 elf_link_hash_traverse (elf_hash_table (info),
2988 elf_link_assign_sym_version,
2993 /* Find all symbols which were defined in a dynamic object and make
2994 the backend pick a reasonable value for them. */
2997 elf_link_hash_traverse (elf_hash_table (info),
2998 elf_adjust_dynamic_symbol,
3003 /* Add some entries to the .dynamic section. We fill in some of the
3004 values later, in elf_bfd_final_link, but we must add the entries
3005 now so that we know the final size of the .dynamic section. */
3007 /* If there are initialization and/or finalization functions to
3008 call then add the corresponding DT_INIT/DT_FINI entries. */
3009 h = (info->init_function
3010 ? elf_link_hash_lookup (elf_hash_table (info),
3011 info->init_function, false,
3015 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3016 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3018 if (! elf_add_dynamic_entry (info, DT_INIT, 0))
3021 h = (info->fini_function
3022 ? elf_link_hash_lookup (elf_hash_table (info),
3023 info->fini_function, false,
3027 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3028 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3030 if (! elf_add_dynamic_entry (info, DT_FINI, 0))
3034 strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3035 if (! elf_add_dynamic_entry (info, DT_HASH, 0)
3036 || ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
3037 || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
3038 || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
3039 || ! elf_add_dynamic_entry (info, DT_SYMENT,
3040 sizeof (Elf_External_Sym)))
3044 /* The backend must work out the sizes of all the other dynamic
3046 if (bed->elf_backend_size_dynamic_sections
3047 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3050 if (elf_hash_table (info)->dynamic_sections_created)
3054 size_t bucketcount = 0;
3055 Elf_Internal_Sym isym;
3056 size_t hash_entry_size;
3058 /* Set up the version definition section. */
3059 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3060 BFD_ASSERT (s != NULL);
3062 /* We may have created additional version definitions if we are
3063 just linking a regular application. */
3064 verdefs = asvinfo.verdefs;
3066 if (verdefs == NULL)
3067 _bfd_strip_section_from_output (info, s);
3072 struct bfd_elf_version_tree *t;
3074 Elf_Internal_Verdef def;
3075 Elf_Internal_Verdaux defaux;
3080 /* Make space for the base version. */
3081 size += sizeof (Elf_External_Verdef);
3082 size += sizeof (Elf_External_Verdaux);
3085 for (t = verdefs; t != NULL; t = t->next)
3087 struct bfd_elf_version_deps *n;
3089 size += sizeof (Elf_External_Verdef);
3090 size += sizeof (Elf_External_Verdaux);
3093 for (n = t->deps; n != NULL; n = n->next)
3094 size += sizeof (Elf_External_Verdaux);
3097 s->_raw_size = size;
3098 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3099 if (s->contents == NULL && s->_raw_size != 0)
3102 /* Fill in the version definition section. */
3106 def.vd_version = VER_DEF_CURRENT;
3107 def.vd_flags = VER_FLG_BASE;
3110 def.vd_aux = sizeof (Elf_External_Verdef);
3111 def.vd_next = (sizeof (Elf_External_Verdef)
3112 + sizeof (Elf_External_Verdaux));
3114 if (soname_indx != (bfd_size_type) -1)
3116 def.vd_hash = bfd_elf_hash (soname);
3117 defaux.vda_name = soname_indx;
3124 name = output_bfd->filename;
3125 def.vd_hash = bfd_elf_hash (name);
3126 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3128 if (indx == (bfd_size_type) -1)
3130 defaux.vda_name = indx;
3132 defaux.vda_next = 0;
3134 _bfd_elf_swap_verdef_out (output_bfd, &def,
3135 (Elf_External_Verdef *)p);
3136 p += sizeof (Elf_External_Verdef);
3137 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3138 (Elf_External_Verdaux *) p);
3139 p += sizeof (Elf_External_Verdaux);
3141 for (t = verdefs; t != NULL; t = t->next)
3144 struct bfd_elf_version_deps *n;
3145 struct elf_link_hash_entry *h;
3148 for (n = t->deps; n != NULL; n = n->next)
3151 /* Add a symbol representing this version. */
3153 if (! (_bfd_generic_link_add_one_symbol
3154 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3155 (bfd_vma) 0, (const char *) NULL, false,
3156 get_elf_backend_data (dynobj)->collect,
3157 (struct bfd_link_hash_entry **) &h)))
3159 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3160 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3161 h->type = STT_OBJECT;
3162 h->verinfo.vertree = t;
3164 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3167 def.vd_version = VER_DEF_CURRENT;
3169 if (t->globals == NULL && t->locals == NULL && ! t->used)
3170 def.vd_flags |= VER_FLG_WEAK;
3171 def.vd_ndx = t->vernum + 1;
3172 def.vd_cnt = cdeps + 1;
3173 def.vd_hash = bfd_elf_hash (t->name);
3174 def.vd_aux = sizeof (Elf_External_Verdef);
3175 if (t->next != NULL)
3176 def.vd_next = (sizeof (Elf_External_Verdef)
3177 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3181 _bfd_elf_swap_verdef_out (output_bfd, &def,
3182 (Elf_External_Verdef *) p);
3183 p += sizeof (Elf_External_Verdef);
3185 defaux.vda_name = h->dynstr_index;
3186 if (t->deps == NULL)
3187 defaux.vda_next = 0;
3189 defaux.vda_next = sizeof (Elf_External_Verdaux);
3190 t->name_indx = defaux.vda_name;
3192 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3193 (Elf_External_Verdaux *) p);
3194 p += sizeof (Elf_External_Verdaux);
3196 for (n = t->deps; n != NULL; n = n->next)
3198 if (n->version_needed == NULL)
3200 /* This can happen if there was an error in the
3202 defaux.vda_name = 0;
3205 defaux.vda_name = n->version_needed->name_indx;
3206 if (n->next == NULL)
3207 defaux.vda_next = 0;
3209 defaux.vda_next = sizeof (Elf_External_Verdaux);
3211 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3212 (Elf_External_Verdaux *) p);
3213 p += sizeof (Elf_External_Verdaux);
3217 if (! elf_add_dynamic_entry (info, DT_VERDEF, 0)
3218 || ! elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
3221 elf_tdata (output_bfd)->cverdefs = cdefs;
3224 if (info->new_dtags && info->flags)
3226 if (! elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
3233 info->flags_1 &= ~ (DF_1_INITFIRST
3236 if (! elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
3240 /* Work out the size of the version reference section. */
3242 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3243 BFD_ASSERT (s != NULL);
3245 struct elf_find_verdep_info sinfo;
3247 sinfo.output_bfd = output_bfd;
3249 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3250 if (sinfo.vers == 0)
3252 sinfo.failed = false;
3254 elf_link_hash_traverse (elf_hash_table (info),
3255 elf_link_find_version_dependencies,
3258 if (elf_tdata (output_bfd)->verref == NULL)
3259 _bfd_strip_section_from_output (info, s);
3262 Elf_Internal_Verneed *t;
3267 /* Build the version definition section. */
3270 for (t = elf_tdata (output_bfd)->verref;
3274 Elf_Internal_Vernaux *a;
3276 size += sizeof (Elf_External_Verneed);
3278 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3279 size += sizeof (Elf_External_Vernaux);
3282 s->_raw_size = size;
3283 s->contents = (bfd_byte *) bfd_alloc (output_bfd, size);
3284 if (s->contents == NULL)
3288 for (t = elf_tdata (output_bfd)->verref;
3293 Elf_Internal_Vernaux *a;
3297 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3300 t->vn_version = VER_NEED_CURRENT;
3302 if (elf_dt_name (t->vn_bfd) != NULL)
3303 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3304 elf_dt_name (t->vn_bfd),
3307 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3308 t->vn_bfd->filename, true, false);
3309 if (indx == (bfd_size_type) -1)
3312 t->vn_aux = sizeof (Elf_External_Verneed);
3313 if (t->vn_nextref == NULL)
3316 t->vn_next = (sizeof (Elf_External_Verneed)
3317 + caux * sizeof (Elf_External_Vernaux));
3319 _bfd_elf_swap_verneed_out (output_bfd, t,
3320 (Elf_External_Verneed *) p);
3321 p += sizeof (Elf_External_Verneed);
3323 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3325 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3326 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3327 a->vna_nodename, true, false);
3328 if (indx == (bfd_size_type) -1)
3331 if (a->vna_nextptr == NULL)
3334 a->vna_next = sizeof (Elf_External_Vernaux);
3336 _bfd_elf_swap_vernaux_out (output_bfd, a,
3337 (Elf_External_Vernaux *) p);
3338 p += sizeof (Elf_External_Vernaux);
3342 if (! elf_add_dynamic_entry (info, DT_VERNEED, 0)
3343 || ! elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
3346 elf_tdata (output_bfd)->cverrefs = crefs;
3350 /* Assign dynsym indicies. In a shared library we generate a
3351 section symbol for each output section, which come first.
3352 Next come all of the back-end allocated local dynamic syms,
3353 followed by the rest of the global symbols. */
3355 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3357 /* Work out the size of the symbol version section. */
3358 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3359 BFD_ASSERT (s != NULL);
3360 if (dynsymcount == 0
3361 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3363 _bfd_strip_section_from_output (info, s);
3364 /* The DYNSYMCOUNT might have changed if we were going to
3365 output a dynamic symbol table entry for S. */
3366 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3370 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3371 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3372 if (s->contents == NULL)
3375 if (! elf_add_dynamic_entry (info, DT_VERSYM, 0))
3379 /* Set the size of the .dynsym and .hash sections. We counted
3380 the number of dynamic symbols in elf_link_add_object_symbols.
3381 We will build the contents of .dynsym and .hash when we build
3382 the final symbol table, because until then we do not know the
3383 correct value to give the symbols. We built the .dynstr
3384 section as we went along in elf_link_add_object_symbols. */
3385 s = bfd_get_section_by_name (dynobj, ".dynsym");
3386 BFD_ASSERT (s != NULL);
3387 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3388 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3389 if (s->contents == NULL && s->_raw_size != 0)
3392 /* The first entry in .dynsym is a dummy symbol. */
3399 elf_swap_symbol_out (output_bfd, &isym,
3400 (PTR) (Elf_External_Sym *) s->contents);
3402 /* Compute the size of the hashing table. As a side effect this
3403 computes the hash values for all the names we export. */
3404 bucketcount = compute_bucket_count (info);
3406 s = bfd_get_section_by_name (dynobj, ".hash");
3407 BFD_ASSERT (s != NULL);
3408 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3409 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3410 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3411 if (s->contents == NULL)
3413 memset (s->contents, 0, (size_t) s->_raw_size);
3415 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
3416 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
3417 s->contents + hash_entry_size);
3419 elf_hash_table (info)->bucketcount = bucketcount;
3421 s = bfd_get_section_by_name (dynobj, ".dynstr");
3422 BFD_ASSERT (s != NULL);
3423 s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3425 if (! elf_add_dynamic_entry (info, DT_NULL, 0))
3432 /* Fix up the flags for a symbol. This handles various cases which
3433 can only be fixed after all the input files are seen. This is
3434 currently called by both adjust_dynamic_symbol and
3435 assign_sym_version, which is unnecessary but perhaps more robust in
3436 the face of future changes. */
3439 elf_fix_symbol_flags (h, eif)
3440 struct elf_link_hash_entry *h;
3441 struct elf_info_failed *eif;
3443 /* If this symbol was mentioned in a non-ELF file, try to set
3444 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3445 permit a non-ELF file to correctly refer to a symbol defined in
3446 an ELF dynamic object. */
3447 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3449 while (h->root.type == bfd_link_hash_indirect)
3450 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3452 if (h->root.type != bfd_link_hash_defined
3453 && h->root.type != bfd_link_hash_defweak)
3454 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3455 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3458 if (h->root.u.def.section->owner != NULL
3459 && (bfd_get_flavour (h->root.u.def.section->owner)
3460 == bfd_target_elf_flavour))
3461 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3462 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3464 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3467 if (h->dynindx == -1
3468 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3469 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3471 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3480 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3481 was first seen in a non-ELF file. Fortunately, if the symbol
3482 was first seen in an ELF file, we're probably OK unless the
3483 symbol was defined in a non-ELF file. Catch that case here.
3484 FIXME: We're still in trouble if the symbol was first seen in
3485 a dynamic object, and then later in a non-ELF regular object. */
3486 if ((h->root.type == bfd_link_hash_defined
3487 || h->root.type == bfd_link_hash_defweak)
3488 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3489 && (h->root.u.def.section->owner != NULL
3490 ? (bfd_get_flavour (h->root.u.def.section->owner)
3491 != bfd_target_elf_flavour)
3492 : (bfd_is_abs_section (h->root.u.def.section)
3493 && (h->elf_link_hash_flags
3494 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3495 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3498 /* If this is a final link, and the symbol was defined as a common
3499 symbol in a regular object file, and there was no definition in
3500 any dynamic object, then the linker will have allocated space for
3501 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3502 flag will not have been set. */
3503 if (h->root.type == bfd_link_hash_defined
3504 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3505 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3506 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3507 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3508 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3510 /* If -Bsymbolic was used (which means to bind references to global
3511 symbols to the definition within the shared object), and this
3512 symbol was defined in a regular object, then it actually doesn't
3513 need a PLT entry. Likewise, if the symbol has any kind of
3514 visibility (internal, hidden, or protected), it doesn't need a
3516 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3517 && eif->info->shared
3518 && (eif->info->symbolic || ELF_ST_VISIBILITY (h->other))
3519 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3521 h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
3522 h->plt.offset = (bfd_vma) -1;
3525 /* If this is a weak defined symbol in a dynamic object, and we know
3526 the real definition in the dynamic object, copy interesting flags
3527 over to the real definition. */
3528 if (h->weakdef != NULL)
3530 struct elf_link_hash_entry *weakdef;
3532 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3533 || h->root.type == bfd_link_hash_defweak);
3534 weakdef = h->weakdef;
3535 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3536 || weakdef->root.type == bfd_link_hash_defweak);
3537 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3539 /* If the real definition is defined by a regular object file,
3540 don't do anything special. See the longer description in
3541 elf_adjust_dynamic_symbol, below. */
3542 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3545 weakdef->elf_link_hash_flags |=
3546 (h->elf_link_hash_flags
3547 & (ELF_LINK_HASH_REF_REGULAR
3548 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3549 | ELF_LINK_NON_GOT_REF));
3555 /* Make the backend pick a good value for a dynamic symbol. This is
3556 called via elf_link_hash_traverse, and also calls itself
3560 elf_adjust_dynamic_symbol (h, data)
3561 struct elf_link_hash_entry *h;
3564 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3566 struct elf_backend_data *bed;
3568 /* Ignore indirect symbols. These are added by the versioning code. */
3569 if (h->root.type == bfd_link_hash_indirect)
3572 /* Fix the symbol flags. */
3573 if (! elf_fix_symbol_flags (h, eif))
3576 /* If this symbol does not require a PLT entry, and it is not
3577 defined by a dynamic object, or is not referenced by a regular
3578 object, ignore it. We do have to handle a weak defined symbol,
3579 even if no regular object refers to it, if we decided to add it
3580 to the dynamic symbol table. FIXME: Do we normally need to worry
3581 about symbols which are defined by one dynamic object and
3582 referenced by another one? */
3583 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
3584 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3585 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3586 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
3587 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
3589 h->plt.offset = (bfd_vma) -1;
3593 /* If we've already adjusted this symbol, don't do it again. This
3594 can happen via a recursive call. */
3595 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
3598 /* Don't look at this symbol again. Note that we must set this
3599 after checking the above conditions, because we may look at a
3600 symbol once, decide not to do anything, and then get called
3601 recursively later after REF_REGULAR is set below. */
3602 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
3604 /* If this is a weak definition, and we know a real definition, and
3605 the real symbol is not itself defined by a regular object file,
3606 then get a good value for the real definition. We handle the
3607 real symbol first, for the convenience of the backend routine.
3609 Note that there is a confusing case here. If the real definition
3610 is defined by a regular object file, we don't get the real symbol
3611 from the dynamic object, but we do get the weak symbol. If the
3612 processor backend uses a COPY reloc, then if some routine in the
3613 dynamic object changes the real symbol, we will not see that
3614 change in the corresponding weak symbol. This is the way other
3615 ELF linkers work as well, and seems to be a result of the shared
3618 I will clarify this issue. Most SVR4 shared libraries define the
3619 variable _timezone and define timezone as a weak synonym. The
3620 tzset call changes _timezone. If you write
3621 extern int timezone;
3623 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3624 you might expect that, since timezone is a synonym for _timezone,
3625 the same number will print both times. However, if the processor
3626 backend uses a COPY reloc, then actually timezone will be copied
3627 into your process image, and, since you define _timezone
3628 yourself, _timezone will not. Thus timezone and _timezone will
3629 wind up at different memory locations. The tzset call will set
3630 _timezone, leaving timezone unchanged. */
3632 if (h->weakdef != NULL)
3634 /* If we get to this point, we know there is an implicit
3635 reference by a regular object file via the weak symbol H.
3636 FIXME: Is this really true? What if the traversal finds
3637 H->WEAKDEF before it finds H? */
3638 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
3640 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
3644 /* If a symbol has no type and no size and does not require a PLT
3645 entry, then we are probably about to do the wrong thing here: we
3646 are probably going to create a COPY reloc for an empty object.
3647 This case can arise when a shared object is built with assembly
3648 code, and the assembly code fails to set the symbol type. */
3650 && h->type == STT_NOTYPE
3651 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
3652 (*_bfd_error_handler)
3653 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3654 h->root.root.string);
3656 dynobj = elf_hash_table (eif->info)->dynobj;
3657 bed = get_elf_backend_data (dynobj);
3658 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
3667 /* This routine is used to export all defined symbols into the dynamic
3668 symbol table. It is called via elf_link_hash_traverse. */
3671 elf_export_symbol (h, data)
3672 struct elf_link_hash_entry *h;
3675 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3677 /* Ignore indirect symbols. These are added by the versioning code. */
3678 if (h->root.type == bfd_link_hash_indirect)
3681 if (h->dynindx == -1
3682 && (h->elf_link_hash_flags
3683 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
3685 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3695 /* Look through the symbols which are defined in other shared
3696 libraries and referenced here. Update the list of version
3697 dependencies. This will be put into the .gnu.version_r section.
3698 This function is called via elf_link_hash_traverse. */
3701 elf_link_find_version_dependencies (h, data)
3702 struct elf_link_hash_entry *h;
3705 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
3706 Elf_Internal_Verneed *t;
3707 Elf_Internal_Vernaux *a;
3709 /* We only care about symbols defined in shared objects with version
3711 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3712 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3714 || h->verinfo.verdef == NULL)
3717 /* See if we already know about this version. */
3718 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
3720 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
3723 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3724 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
3730 /* This is a new version. Add it to tree we are building. */
3734 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, sizeof *t);
3737 rinfo->failed = true;
3741 t->vn_bfd = h->verinfo.verdef->vd_bfd;
3742 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
3743 elf_tdata (rinfo->output_bfd)->verref = t;
3746 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, sizeof *a);
3748 /* Note that we are copying a string pointer here, and testing it
3749 above. If bfd_elf_string_from_elf_section is ever changed to
3750 discard the string data when low in memory, this will have to be
3752 a->vna_nodename = h->verinfo.verdef->vd_nodename;
3754 a->vna_flags = h->verinfo.verdef->vd_flags;
3755 a->vna_nextptr = t->vn_auxptr;
3757 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
3760 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
3767 /* Figure out appropriate versions for all the symbols. We may not
3768 have the version number script until we have read all of the input
3769 files, so until that point we don't know which symbols should be
3770 local. This function is called via elf_link_hash_traverse. */
3773 elf_link_assign_sym_version (h, data)
3774 struct elf_link_hash_entry *h;
3777 struct elf_assign_sym_version_info *sinfo =
3778 (struct elf_assign_sym_version_info *) data;
3779 struct bfd_link_info *info = sinfo->info;
3780 struct elf_backend_data *bed;
3781 struct elf_info_failed eif;
3784 /* Fix the symbol flags. */
3787 if (! elf_fix_symbol_flags (h, &eif))
3790 sinfo->failed = true;
3794 /* We only need version numbers for symbols defined in regular
3796 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3799 bed = get_elf_backend_data (sinfo->output_bfd);
3800 p = strchr (h->root.root.string, ELF_VER_CHR);
3801 if (p != NULL && h->verinfo.vertree == NULL)
3803 struct bfd_elf_version_tree *t;
3808 /* There are two consecutive ELF_VER_CHR characters if this is
3809 not a hidden symbol. */
3811 if (*p == ELF_VER_CHR)
3817 /* If there is no version string, we can just return out. */
3821 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3825 /* Look for the version. If we find it, it is no longer weak. */
3826 for (t = sinfo->verdefs; t != NULL; t = t->next)
3828 if (strcmp (t->name, p) == 0)
3832 struct bfd_elf_version_expr *d;
3834 len = p - h->root.root.string;
3835 alc = bfd_alloc (sinfo->output_bfd, len);
3838 strncpy (alc, h->root.root.string, len - 1);
3839 alc[len - 1] = '\0';
3840 if (alc[len - 2] == ELF_VER_CHR)
3841 alc[len - 2] = '\0';
3843 h->verinfo.vertree = t;
3847 if (t->globals != NULL)
3849 for (d = t->globals; d != NULL; d = d->next)
3850 if ((*d->match) (d, alc))
3854 /* See if there is anything to force this symbol to
3856 if (d == NULL && t->locals != NULL)
3858 for (d = t->locals; d != NULL; d = d->next)
3860 if ((*d->match) (d, alc))
3862 if (h->dynindx != -1
3864 && ! sinfo->export_dynamic)
3866 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3867 (*bed->elf_backend_hide_symbol) (info, h);
3868 /* FIXME: The name of the symbol has
3869 already been recorded in the dynamic
3870 string table section. */
3878 bfd_release (sinfo->output_bfd, alc);
3883 /* If we are building an application, we need to create a
3884 version node for this version. */
3885 if (t == NULL && ! info->shared)
3887 struct bfd_elf_version_tree **pp;
3890 /* If we aren't going to export this symbol, we don't need
3891 to worry about it. */
3892 if (h->dynindx == -1)
3895 t = ((struct bfd_elf_version_tree *)
3896 bfd_alloc (sinfo->output_bfd, sizeof *t));
3899 sinfo->failed = true;
3908 t->name_indx = (unsigned int) -1;
3912 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
3914 t->vernum = version_index;
3918 h->verinfo.vertree = t;
3922 /* We could not find the version for a symbol when
3923 generating a shared archive. Return an error. */
3924 (*_bfd_error_handler)
3925 (_("%s: undefined versioned symbol name %s"),
3926 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
3927 bfd_set_error (bfd_error_bad_value);
3928 sinfo->failed = true;
3933 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3936 /* If we don't have a version for this symbol, see if we can find
3938 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
3940 struct bfd_elf_version_tree *t;
3941 struct bfd_elf_version_tree *deflt;
3942 struct bfd_elf_version_expr *d;
3944 /* See if can find what version this symbol is in. If the
3945 symbol is supposed to be local, then don't actually register
3948 for (t = sinfo->verdefs; t != NULL; t = t->next)
3950 if (t->globals != NULL)
3952 for (d = t->globals; d != NULL; d = d->next)
3954 if ((*d->match) (d, h->root.root.string))
3956 h->verinfo.vertree = t;
3965 if (t->locals != NULL)
3967 for (d = t->locals; d != NULL; d = d->next)
3969 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
3971 else if ((*d->match) (d, h->root.root.string))
3973 h->verinfo.vertree = t;
3974 if (h->dynindx != -1
3976 && ! sinfo->export_dynamic)
3978 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3979 (*bed->elf_backend_hide_symbol) (info, h);
3980 /* FIXME: The name of the symbol has already
3981 been recorded in the dynamic string table
3993 if (deflt != NULL && h->verinfo.vertree == NULL)
3995 h->verinfo.vertree = deflt;
3996 if (h->dynindx != -1
3998 && ! sinfo->export_dynamic)
4000 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
4001 (*bed->elf_backend_hide_symbol) (info, h);
4002 /* FIXME: The name of the symbol has already been
4003 recorded in the dynamic string table section. */
4011 /* Final phase of ELF linker. */
4013 /* A structure we use to avoid passing large numbers of arguments. */
4015 struct elf_final_link_info
4017 /* General link information. */
4018 struct bfd_link_info *info;
4021 /* Symbol string table. */
4022 struct bfd_strtab_hash *symstrtab;
4023 /* .dynsym section. */
4024 asection *dynsym_sec;
4025 /* .hash section. */
4027 /* symbol version section (.gnu.version). */
4028 asection *symver_sec;
4029 /* Buffer large enough to hold contents of any section. */
4031 /* Buffer large enough to hold external relocs of any section. */
4032 PTR external_relocs;
4033 /* Buffer large enough to hold internal relocs of any section. */
4034 Elf_Internal_Rela *internal_relocs;
4035 /* Buffer large enough to hold external local symbols of any input
4037 Elf_External_Sym *external_syms;
4038 /* Buffer large enough to hold internal local symbols of any input
4040 Elf_Internal_Sym *internal_syms;
4041 /* Array large enough to hold a symbol index for each local symbol
4042 of any input BFD. */
4044 /* Array large enough to hold a section pointer for each local
4045 symbol of any input BFD. */
4046 asection **sections;
4047 /* Buffer to hold swapped out symbols. */
4048 Elf_External_Sym *symbuf;
4049 /* Number of swapped out symbols in buffer. */
4050 size_t symbuf_count;
4051 /* Number of symbols which fit in symbuf. */
4055 static boolean elf_link_output_sym
4056 PARAMS ((struct elf_final_link_info *, const char *,
4057 Elf_Internal_Sym *, asection *));
4058 static boolean elf_link_flush_output_syms
4059 PARAMS ((struct elf_final_link_info *));
4060 static boolean elf_link_output_extsym
4061 PARAMS ((struct elf_link_hash_entry *, PTR));
4062 static boolean elf_link_input_bfd
4063 PARAMS ((struct elf_final_link_info *, bfd *));
4064 static boolean elf_reloc_link_order
4065 PARAMS ((bfd *, struct bfd_link_info *, asection *,
4066 struct bfd_link_order *));
4068 /* This struct is used to pass information to elf_link_output_extsym. */
4070 struct elf_outext_info
4074 struct elf_final_link_info *finfo;
4077 /* Compute the size of, and allocate space for, REL_HDR which is the
4078 section header for a section containing relocations for O. */
4081 elf_link_size_reloc_section (abfd, rel_hdr, o)
4083 Elf_Internal_Shdr *rel_hdr;
4086 register struct elf_link_hash_entry **p, **pend;
4087 unsigned reloc_count;
4089 /* Figure out how many relocations there will be. */
4090 if (rel_hdr == &elf_section_data (o)->rel_hdr)
4091 reloc_count = elf_section_data (o)->rel_count;
4093 reloc_count = elf_section_data (o)->rel_count2;
4095 /* That allows us to calculate the size of the section. */
4096 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4098 /* The contents field must last into write_object_contents, so we
4099 allocate it with bfd_alloc rather than malloc. Also since we
4100 cannot be sure that the contents will actually be filled in,
4101 we zero the allocated space. */
4102 rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4103 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4106 /* We only allocate one set of hash entries, so we only do it the
4107 first time we are called. */
4108 if (elf_section_data (o)->rel_hashes == NULL)
4110 p = ((struct elf_link_hash_entry **)
4111 bfd_malloc (o->reloc_count
4112 * sizeof (struct elf_link_hash_entry *)));
4113 if (p == NULL && o->reloc_count != 0)
4116 elf_section_data (o)->rel_hashes = p;
4117 pend = p + o->reloc_count;
4118 for (; p < pend; p++)
4125 /* When performing a relocateable link, the input relocations are
4126 preserved. But, if they reference global symbols, the indices
4127 referenced must be updated. Update all the relocations in
4128 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4131 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4133 Elf_Internal_Shdr *rel_hdr;
4135 struct elf_link_hash_entry **rel_hash;
4138 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4140 for (i = 0; i < count; i++, rel_hash++)
4142 if (*rel_hash == NULL)
4145 BFD_ASSERT ((*rel_hash)->indx >= 0);
4147 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4149 Elf_External_Rel *erel;
4150 Elf_Internal_Rel irel;
4152 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4153 if (bed->s->swap_reloc_in)
4154 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, &irel);
4156 elf_swap_reloc_in (abfd, erel, &irel);
4157 irel.r_info = ELF_R_INFO ((*rel_hash)->indx,
4158 ELF_R_TYPE (irel.r_info));
4159 if (bed->s->swap_reloc_out)
4160 (*bed->s->swap_reloc_out) (abfd, &irel, (bfd_byte *) erel);
4162 elf_swap_reloc_out (abfd, &irel, erel);
4166 Elf_External_Rela *erela;
4167 Elf_Internal_Rela irela;
4169 BFD_ASSERT (rel_hdr->sh_entsize
4170 == sizeof (Elf_External_Rela));
4172 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4173 if (bed->s->swap_reloca_in)
4174 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, &irela);
4176 elf_swap_reloca_in (abfd, erela, &irela);
4177 irela.r_info = ELF_R_INFO ((*rel_hash)->indx,
4178 ELF_R_TYPE (irela.r_info));
4179 if (bed->s->swap_reloca_out)
4180 (*bed->s->swap_reloca_out) (abfd, &irela, (bfd_byte *) erela);
4182 elf_swap_reloca_out (abfd, &irela, erela);
4187 /* Do the final step of an ELF link. */
4190 elf_bfd_final_link (abfd, info)
4192 struct bfd_link_info *info;
4196 struct elf_final_link_info finfo;
4197 register asection *o;
4198 register struct bfd_link_order *p;
4200 size_t max_contents_size;
4201 size_t max_external_reloc_size;
4202 size_t max_internal_reloc_count;
4203 size_t max_sym_count;
4205 Elf_Internal_Sym elfsym;
4207 Elf_Internal_Shdr *symtab_hdr;
4208 Elf_Internal_Shdr *symstrtab_hdr;
4209 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4210 struct elf_outext_info eoinfo;
4213 abfd->flags |= DYNAMIC;
4215 dynamic = elf_hash_table (info)->dynamic_sections_created;
4216 dynobj = elf_hash_table (info)->dynobj;
4219 finfo.output_bfd = abfd;
4220 finfo.symstrtab = elf_stringtab_init ();
4221 if (finfo.symstrtab == NULL)
4226 finfo.dynsym_sec = NULL;
4227 finfo.hash_sec = NULL;
4228 finfo.symver_sec = NULL;
4232 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4233 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4234 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4235 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4236 /* Note that it is OK if symver_sec is NULL. */
4239 finfo.contents = NULL;
4240 finfo.external_relocs = NULL;
4241 finfo.internal_relocs = NULL;
4242 finfo.external_syms = NULL;
4243 finfo.internal_syms = NULL;
4244 finfo.indices = NULL;
4245 finfo.sections = NULL;
4246 finfo.symbuf = NULL;
4247 finfo.symbuf_count = 0;
4249 /* Count up the number of relocations we will output for each output
4250 section, so that we know the sizes of the reloc sections. We
4251 also figure out some maximum sizes. */
4252 max_contents_size = 0;
4253 max_external_reloc_size = 0;
4254 max_internal_reloc_count = 0;
4256 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4260 for (p = o->link_order_head; p != NULL; p = p->next)
4262 if (p->type == bfd_section_reloc_link_order
4263 || p->type == bfd_symbol_reloc_link_order)
4265 else if (p->type == bfd_indirect_link_order)
4269 sec = p->u.indirect.section;
4271 /* Mark all sections which are to be included in the
4272 link. This will normally be every section. We need
4273 to do this so that we can identify any sections which
4274 the linker has decided to not include. */
4275 sec->linker_mark = true;
4277 if (info->relocateable || info->emitrelocations)
4278 o->reloc_count += sec->reloc_count;
4280 if (sec->_raw_size > max_contents_size)
4281 max_contents_size = sec->_raw_size;
4282 if (sec->_cooked_size > max_contents_size)
4283 max_contents_size = sec->_cooked_size;
4285 /* We are interested in just local symbols, not all
4287 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
4288 && (sec->owner->flags & DYNAMIC) == 0)
4292 if (elf_bad_symtab (sec->owner))
4293 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
4294 / sizeof (Elf_External_Sym));
4296 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
4298 if (sym_count > max_sym_count)
4299 max_sym_count = sym_count;
4301 if ((sec->flags & SEC_RELOC) != 0)
4305 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
4306 if (ext_size > max_external_reloc_size)
4307 max_external_reloc_size = ext_size;
4308 if (sec->reloc_count > max_internal_reloc_count)
4309 max_internal_reloc_count = sec->reloc_count;
4315 if (o->reloc_count > 0)
4316 o->flags |= SEC_RELOC;
4319 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4320 set it (this is probably a bug) and if it is set
4321 assign_section_numbers will create a reloc section. */
4322 o->flags &=~ SEC_RELOC;
4325 /* If the SEC_ALLOC flag is not set, force the section VMA to
4326 zero. This is done in elf_fake_sections as well, but forcing
4327 the VMA to 0 here will ensure that relocs against these
4328 sections are handled correctly. */
4329 if ((o->flags & SEC_ALLOC) == 0
4330 && ! o->user_set_vma)
4334 /* Figure out the file positions for everything but the symbol table
4335 and the relocs. We set symcount to force assign_section_numbers
4336 to create a symbol table. */
4337 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
4338 BFD_ASSERT (! abfd->output_has_begun);
4339 if (! _bfd_elf_compute_section_file_positions (abfd, info))
4342 /* Figure out how many relocations we will have in each section.
4343 Just using RELOC_COUNT isn't good enough since that doesn't
4344 maintain a separate value for REL vs. RELA relocations. */
4345 if (info->relocateable || info->emitrelocations)
4346 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4347 for (o = sub->sections; o != NULL; o = o->next)
4349 asection *output_section;
4351 if (! o->linker_mark)
4353 /* This section was omitted from the link. */
4357 output_section = o->output_section;
4359 if (output_section != NULL
4360 && (o->flags & SEC_RELOC) != 0)
4362 struct bfd_elf_section_data *esdi
4363 = elf_section_data (o);
4364 struct bfd_elf_section_data *esdo
4365 = elf_section_data (output_section);
4366 unsigned int *rel_count;
4367 unsigned int *rel_count2;
4369 /* We must be careful to add the relocation froms the
4370 input section to the right output count. */
4371 if (esdi->rel_hdr.sh_entsize == esdo->rel_hdr.sh_entsize)
4373 rel_count = &esdo->rel_count;
4374 rel_count2 = &esdo->rel_count2;
4378 rel_count = &esdo->rel_count2;
4379 rel_count2 = &esdo->rel_count;
4382 *rel_count += (esdi->rel_hdr.sh_size
4383 / esdi->rel_hdr.sh_entsize);
4385 *rel_count2 += (esdi->rel_hdr2->sh_size
4386 / esdi->rel_hdr2->sh_entsize);
4390 /* That created the reloc sections. Set their sizes, and assign
4391 them file positions, and allocate some buffers. */
4392 for (o = abfd->sections; o != NULL; o = o->next)
4394 if ((o->flags & SEC_RELOC) != 0)
4396 if (!elf_link_size_reloc_section (abfd,
4397 &elf_section_data (o)->rel_hdr,
4401 if (elf_section_data (o)->rel_hdr2
4402 && !elf_link_size_reloc_section (abfd,
4403 elf_section_data (o)->rel_hdr2,
4408 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4409 to count upwards while actually outputting the relocations. */
4410 elf_section_data (o)->rel_count = 0;
4411 elf_section_data (o)->rel_count2 = 0;
4414 _bfd_elf_assign_file_positions_for_relocs (abfd);
4416 /* We have now assigned file positions for all the sections except
4417 .symtab and .strtab. We start the .symtab section at the current
4418 file position, and write directly to it. We build the .strtab
4419 section in memory. */
4420 bfd_get_symcount (abfd) = 0;
4421 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4422 /* sh_name is set in prep_headers. */
4423 symtab_hdr->sh_type = SHT_SYMTAB;
4424 symtab_hdr->sh_flags = 0;
4425 symtab_hdr->sh_addr = 0;
4426 symtab_hdr->sh_size = 0;
4427 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
4428 /* sh_link is set in assign_section_numbers. */
4429 /* sh_info is set below. */
4430 /* sh_offset is set just below. */
4431 symtab_hdr->sh_addralign = 4; /* FIXME: system dependent? */
4433 off = elf_tdata (abfd)->next_file_pos;
4434 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
4436 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4437 incorrect. We do not yet know the size of the .symtab section.
4438 We correct next_file_pos below, after we do know the size. */
4440 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4441 continuously seeking to the right position in the file. */
4442 if (! info->keep_memory || max_sym_count < 20)
4443 finfo.symbuf_size = 20;
4445 finfo.symbuf_size = max_sym_count;
4446 finfo.symbuf = ((Elf_External_Sym *)
4447 bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
4448 if (finfo.symbuf == NULL)
4451 /* Start writing out the symbol table. The first symbol is always a
4453 if (info->strip != strip_all || info->relocateable || info->emitrelocations)
4455 elfsym.st_value = 0;
4458 elfsym.st_other = 0;
4459 elfsym.st_shndx = SHN_UNDEF;
4460 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4461 &elfsym, bfd_und_section_ptr))
4466 /* Some standard ELF linkers do this, but we don't because it causes
4467 bootstrap comparison failures. */
4468 /* Output a file symbol for the output file as the second symbol.
4469 We output this even if we are discarding local symbols, although
4470 I'm not sure if this is correct. */
4471 elfsym.st_value = 0;
4473 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
4474 elfsym.st_other = 0;
4475 elfsym.st_shndx = SHN_ABS;
4476 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
4477 &elfsym, bfd_abs_section_ptr))
4481 /* Output a symbol for each section. We output these even if we are
4482 discarding local symbols, since they are used for relocs. These
4483 symbols have no names. We store the index of each one in the
4484 index field of the section, so that we can find it again when
4485 outputting relocs. */
4486 if (info->strip != strip_all || info->relocateable || info->emitrelocations)
4489 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4490 elfsym.st_other = 0;
4491 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4493 o = section_from_elf_index (abfd, i);
4495 o->target_index = bfd_get_symcount (abfd);
4496 elfsym.st_shndx = i;
4497 if (info->relocateable || o == NULL)
4498 elfsym.st_value = 0;
4500 elfsym.st_value = o->vma;
4501 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4507 /* Allocate some memory to hold information read in from the input
4509 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
4510 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
4511 finfo.internal_relocs = ((Elf_Internal_Rela *)
4512 bfd_malloc (max_internal_reloc_count
4513 * sizeof (Elf_Internal_Rela)
4514 * bed->s->int_rels_per_ext_rel));
4515 finfo.external_syms = ((Elf_External_Sym *)
4516 bfd_malloc (max_sym_count
4517 * sizeof (Elf_External_Sym)));
4518 finfo.internal_syms = ((Elf_Internal_Sym *)
4519 bfd_malloc (max_sym_count
4520 * sizeof (Elf_Internal_Sym)));
4521 finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
4522 finfo.sections = ((asection **)
4523 bfd_malloc (max_sym_count * sizeof (asection *)));
4524 if ((finfo.contents == NULL && max_contents_size != 0)
4525 || (finfo.external_relocs == NULL && max_external_reloc_size != 0)
4526 || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
4527 || (finfo.external_syms == NULL && max_sym_count != 0)
4528 || (finfo.internal_syms == NULL && max_sym_count != 0)
4529 || (finfo.indices == NULL && max_sym_count != 0)
4530 || (finfo.sections == NULL && max_sym_count != 0))
4533 /* Since ELF permits relocations to be against local symbols, we
4534 must have the local symbols available when we do the relocations.
4535 Since we would rather only read the local symbols once, and we
4536 would rather not keep them in memory, we handle all the
4537 relocations for a single input file at the same time.
4539 Unfortunately, there is no way to know the total number of local
4540 symbols until we have seen all of them, and the local symbol
4541 indices precede the global symbol indices. This means that when
4542 we are generating relocateable output, and we see a reloc against
4543 a global symbol, we can not know the symbol index until we have
4544 finished examining all the local symbols to see which ones we are
4545 going to output. To deal with this, we keep the relocations in
4546 memory, and don't output them until the end of the link. This is
4547 an unfortunate waste of memory, but I don't see a good way around
4548 it. Fortunately, it only happens when performing a relocateable
4549 link, which is not the common case. FIXME: If keep_memory is set
4550 we could write the relocs out and then read them again; I don't
4551 know how bad the memory loss will be. */
4553 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4554 sub->output_has_begun = false;
4555 for (o = abfd->sections; o != NULL; o = o->next)
4557 for (p = o->link_order_head; p != NULL; p = p->next)
4559 if (p->type == bfd_indirect_link_order
4560 && (bfd_get_flavour (p->u.indirect.section->owner)
4561 == bfd_target_elf_flavour))
4563 sub = p->u.indirect.section->owner;
4564 if (! sub->output_has_begun)
4566 if (! elf_link_input_bfd (&finfo, sub))
4568 sub->output_has_begun = true;
4571 else if (p->type == bfd_section_reloc_link_order
4572 || p->type == bfd_symbol_reloc_link_order)
4574 if (! elf_reloc_link_order (abfd, info, o, p))
4579 if (! _bfd_default_link_order (abfd, info, o, p))
4585 /* That wrote out all the local symbols. Finish up the symbol table
4586 with the global symbols. Even if we want to strip everything we
4587 can, we still need to deal with those global symbols that got
4588 converted to local in a version script. */
4592 /* Output any global symbols that got converted to local in a
4593 version script. We do this in a separate step since ELF
4594 requires all local symbols to appear prior to any global
4595 symbols. FIXME: We should only do this if some global
4596 symbols were, in fact, converted to become local. FIXME:
4597 Will this work correctly with the Irix 5 linker? */
4598 eoinfo.failed = false;
4599 eoinfo.finfo = &finfo;
4600 eoinfo.localsyms = true;
4601 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4607 /* The sh_info field records the index of the first non local symbol. */
4608 symtab_hdr->sh_info = bfd_get_symcount (abfd);
4612 Elf_Internal_Sym sym;
4613 Elf_External_Sym *dynsym =
4614 (Elf_External_Sym *)finfo.dynsym_sec->contents;
4615 long last_local = 0;
4617 /* Write out the section symbols for the output sections. */
4624 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4627 for (s = abfd->sections; s != NULL; s = s->next)
4630 indx = elf_section_data (s)->this_idx;
4631 BFD_ASSERT (indx > 0);
4632 sym.st_shndx = indx;
4633 sym.st_value = s->vma;
4635 elf_swap_symbol_out (abfd, &sym,
4636 dynsym + elf_section_data (s)->dynindx);
4639 last_local = bfd_count_sections (abfd);
4642 /* Write out the local dynsyms. */
4643 if (elf_hash_table (info)->dynlocal)
4645 struct elf_link_local_dynamic_entry *e;
4646 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
4650 sym.st_size = e->isym.st_size;
4651 sym.st_other = e->isym.st_other;
4653 /* Copy the internal symbol as is.
4654 Note that we saved a word of storage and overwrote
4655 the original st_name with the dynstr_index. */
4658 if (e->isym.st_shndx > 0 && e->isym.st_shndx < SHN_LORESERVE)
4660 s = bfd_section_from_elf_index (e->input_bfd,
4664 elf_section_data (s->output_section)->this_idx;
4665 sym.st_value = (s->output_section->vma
4667 + e->isym.st_value);
4670 if (last_local < e->dynindx)
4671 last_local = e->dynindx;
4673 elf_swap_symbol_out (abfd, &sym, dynsym + e->dynindx);
4677 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
4681 /* We get the global symbols from the hash table. */
4682 eoinfo.failed = false;
4683 eoinfo.localsyms = false;
4684 eoinfo.finfo = &finfo;
4685 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4690 /* If backend needs to output some symbols not present in the hash
4691 table, do it now. */
4692 if (bed->elf_backend_output_arch_syms)
4694 if (! (*bed->elf_backend_output_arch_syms)
4695 (abfd, info, (PTR) &finfo,
4696 (boolean (*) PARAMS ((PTR, const char *,
4697 Elf_Internal_Sym *, asection *)))
4698 elf_link_output_sym))
4702 /* Flush all symbols to the file. */
4703 if (! elf_link_flush_output_syms (&finfo))
4706 /* Now we know the size of the symtab section. */
4707 off += symtab_hdr->sh_size;
4709 /* Finish up and write out the symbol string table (.strtab)
4711 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
4712 /* sh_name was set in prep_headers. */
4713 symstrtab_hdr->sh_type = SHT_STRTAB;
4714 symstrtab_hdr->sh_flags = 0;
4715 symstrtab_hdr->sh_addr = 0;
4716 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
4717 symstrtab_hdr->sh_entsize = 0;
4718 symstrtab_hdr->sh_link = 0;
4719 symstrtab_hdr->sh_info = 0;
4720 /* sh_offset is set just below. */
4721 symstrtab_hdr->sh_addralign = 1;
4723 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
4724 elf_tdata (abfd)->next_file_pos = off;
4726 if (bfd_get_symcount (abfd) > 0)
4728 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
4729 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
4733 /* Adjust the relocs to have the correct symbol indices. */
4734 for (o = abfd->sections; o != NULL; o = o->next)
4736 if ((o->flags & SEC_RELOC) == 0)
4739 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
4740 elf_section_data (o)->rel_count,
4741 elf_section_data (o)->rel_hashes);
4742 if (elf_section_data (o)->rel_hdr2 != NULL)
4743 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
4744 elf_section_data (o)->rel_count2,
4745 (elf_section_data (o)->rel_hashes
4746 + elf_section_data (o)->rel_count));
4748 /* Set the reloc_count field to 0 to prevent write_relocs from
4749 trying to swap the relocs out itself. */
4753 /* If we are linking against a dynamic object, or generating a
4754 shared library, finish up the dynamic linking information. */
4757 Elf_External_Dyn *dyncon, *dynconend;
4759 /* Fix up .dynamic entries. */
4760 o = bfd_get_section_by_name (dynobj, ".dynamic");
4761 BFD_ASSERT (o != NULL);
4763 dyncon = (Elf_External_Dyn *) o->contents;
4764 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
4765 for (; dyncon < dynconend; dyncon++)
4767 Elf_Internal_Dyn dyn;
4771 elf_swap_dyn_in (dynobj, dyncon, &dyn);
4778 name = info->init_function;
4781 name = info->fini_function;
4784 struct elf_link_hash_entry *h;
4786 h = elf_link_hash_lookup (elf_hash_table (info), name,
4787 false, false, true);
4789 && (h->root.type == bfd_link_hash_defined
4790 || h->root.type == bfd_link_hash_defweak))
4792 dyn.d_un.d_val = h->root.u.def.value;
4793 o = h->root.u.def.section;
4794 if (o->output_section != NULL)
4795 dyn.d_un.d_val += (o->output_section->vma
4796 + o->output_offset);
4799 /* The symbol is imported from another shared
4800 library and does not apply to this one. */
4804 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4819 name = ".gnu.version_d";
4822 name = ".gnu.version_r";
4825 name = ".gnu.version";
4827 o = bfd_get_section_by_name (abfd, name);
4828 BFD_ASSERT (o != NULL);
4829 dyn.d_un.d_ptr = o->vma;
4830 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4837 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
4842 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4844 Elf_Internal_Shdr *hdr;
4846 hdr = elf_elfsections (abfd)[i];
4847 if (hdr->sh_type == type
4848 && (hdr->sh_flags & SHF_ALLOC) != 0)
4850 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
4851 dyn.d_un.d_val += hdr->sh_size;
4854 if (dyn.d_un.d_val == 0
4855 || hdr->sh_addr < dyn.d_un.d_val)
4856 dyn.d_un.d_val = hdr->sh_addr;
4860 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4866 /* If we have created any dynamic sections, then output them. */
4869 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
4872 for (o = dynobj->sections; o != NULL; o = o->next)
4874 if ((o->flags & SEC_HAS_CONTENTS) == 0
4875 || o->_raw_size == 0)
4877 if ((o->flags & SEC_LINKER_CREATED) == 0)
4879 /* At this point, we are only interested in sections
4880 created by elf_link_create_dynamic_sections. */
4883 if ((elf_section_data (o->output_section)->this_hdr.sh_type
4885 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
4887 if (! bfd_set_section_contents (abfd, o->output_section,
4888 o->contents, o->output_offset,
4896 /* The contents of the .dynstr section are actually in a
4898 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
4899 if (bfd_seek (abfd, off, SEEK_SET) != 0
4900 || ! _bfd_stringtab_emit (abfd,
4901 elf_hash_table (info)->dynstr))
4907 /* If we have optimized stabs strings, output them. */
4908 if (elf_hash_table (info)->stab_info != NULL)
4910 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
4914 if (finfo.symstrtab != NULL)
4915 _bfd_stringtab_free (finfo.symstrtab);
4916 if (finfo.contents != NULL)
4917 free (finfo.contents);
4918 if (finfo.external_relocs != NULL)
4919 free (finfo.external_relocs);
4920 if (finfo.internal_relocs != NULL)
4921 free (finfo.internal_relocs);
4922 if (finfo.external_syms != NULL)
4923 free (finfo.external_syms);
4924 if (finfo.internal_syms != NULL)
4925 free (finfo.internal_syms);
4926 if (finfo.indices != NULL)
4927 free (finfo.indices);
4928 if (finfo.sections != NULL)
4929 free (finfo.sections);
4930 if (finfo.symbuf != NULL)
4931 free (finfo.symbuf);
4932 for (o = abfd->sections; o != NULL; o = o->next)
4934 if ((o->flags & SEC_RELOC) != 0
4935 && elf_section_data (o)->rel_hashes != NULL)
4936 free (elf_section_data (o)->rel_hashes);
4939 elf_tdata (abfd)->linker = true;
4944 if (finfo.symstrtab != NULL)
4945 _bfd_stringtab_free (finfo.symstrtab);
4946 if (finfo.contents != NULL)
4947 free (finfo.contents);
4948 if (finfo.external_relocs != NULL)
4949 free (finfo.external_relocs);
4950 if (finfo.internal_relocs != NULL)
4951 free (finfo.internal_relocs);
4952 if (finfo.external_syms != NULL)
4953 free (finfo.external_syms);
4954 if (finfo.internal_syms != NULL)
4955 free (finfo.internal_syms);
4956 if (finfo.indices != NULL)
4957 free (finfo.indices);
4958 if (finfo.sections != NULL)
4959 free (finfo.sections);
4960 if (finfo.symbuf != NULL)
4961 free (finfo.symbuf);
4962 for (o = abfd->sections; o != NULL; o = o->next)
4964 if ((o->flags & SEC_RELOC) != 0
4965 && elf_section_data (o)->rel_hashes != NULL)
4966 free (elf_section_data (o)->rel_hashes);
4972 /* Add a symbol to the output symbol table. */
4975 elf_link_output_sym (finfo, name, elfsym, input_sec)
4976 struct elf_final_link_info *finfo;
4978 Elf_Internal_Sym *elfsym;
4979 asection *input_sec;
4981 boolean (*output_symbol_hook) PARAMS ((bfd *,
4982 struct bfd_link_info *info,
4987 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
4988 elf_backend_link_output_symbol_hook;
4989 if (output_symbol_hook != NULL)
4991 if (! ((*output_symbol_hook)
4992 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
4996 if (name == (const char *) NULL || *name == '\0')
4997 elfsym->st_name = 0;
4998 else if (input_sec->flags & SEC_EXCLUDE)
4999 elfsym->st_name = 0;
5002 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5005 if (elfsym->st_name == (unsigned long) -1)
5009 if (finfo->symbuf_count >= finfo->symbuf_size)
5011 if (! elf_link_flush_output_syms (finfo))
5015 elf_swap_symbol_out (finfo->output_bfd, elfsym,
5016 (PTR) (finfo->symbuf + finfo->symbuf_count));
5017 ++finfo->symbuf_count;
5019 ++ bfd_get_symcount (finfo->output_bfd);
5024 /* Flush the output symbols to the file. */
5027 elf_link_flush_output_syms (finfo)
5028 struct elf_final_link_info *finfo;
5030 if (finfo->symbuf_count > 0)
5032 Elf_Internal_Shdr *symtab;
5034 symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5036 if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
5038 || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
5039 sizeof (Elf_External_Sym), finfo->output_bfd)
5040 != finfo->symbuf_count * sizeof (Elf_External_Sym)))
5043 symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
5045 finfo->symbuf_count = 0;
5051 /* Add an external symbol to the symbol table. This is called from
5052 the hash table traversal routine. When generating a shared object,
5053 we go through the symbol table twice. The first time we output
5054 anything that might have been forced to local scope in a version
5055 script. The second time we output the symbols that are still
5059 elf_link_output_extsym (h, data)
5060 struct elf_link_hash_entry *h;
5063 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
5064 struct elf_final_link_info *finfo = eoinfo->finfo;
5066 Elf_Internal_Sym sym;
5067 asection *input_sec;
5069 /* Decide whether to output this symbol in this pass. */
5070 if (eoinfo->localsyms)
5072 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5077 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5081 /* If we are not creating a shared library, and this symbol is
5082 referenced by a shared library but is not defined anywhere, then
5083 warn that it is undefined. If we do not do this, the runtime
5084 linker will complain that the symbol is undefined when the
5085 program is run. We don't have to worry about symbols that are
5086 referenced by regular files, because we will already have issued
5087 warnings for them. */
5088 if (! finfo->info->relocateable
5089 && ! (finfo->info->shared
5090 && !finfo->info->no_undefined)
5091 && h->root.type == bfd_link_hash_undefined
5092 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
5093 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5095 if (! ((*finfo->info->callbacks->undefined_symbol)
5096 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
5097 (asection *) NULL, 0, true)))
5099 eoinfo->failed = true;
5104 /* We don't want to output symbols that have never been mentioned by
5105 a regular file, or that we have been told to strip. However, if
5106 h->indx is set to -2, the symbol is used by a reloc and we must
5110 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
5111 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
5112 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
5113 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5115 else if (finfo->info->strip == strip_all
5116 || (finfo->info->strip == strip_some
5117 && bfd_hash_lookup (finfo->info->keep_hash,
5118 h->root.root.string,
5119 false, false) == NULL))
5124 /* If we're stripping it, and it's not a dynamic symbol, there's
5125 nothing else to do unless it is a forced local symbol. */
5128 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5132 sym.st_size = h->size;
5133 sym.st_other = h->other;
5134 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5135 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
5136 else if (h->root.type == bfd_link_hash_undefweak
5137 || h->root.type == bfd_link_hash_defweak)
5138 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
5140 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
5142 switch (h->root.type)
5145 case bfd_link_hash_new:
5149 case bfd_link_hash_undefined:
5150 input_sec = bfd_und_section_ptr;
5151 sym.st_shndx = SHN_UNDEF;
5154 case bfd_link_hash_undefweak:
5155 input_sec = bfd_und_section_ptr;
5156 sym.st_shndx = SHN_UNDEF;
5159 case bfd_link_hash_defined:
5160 case bfd_link_hash_defweak:
5162 input_sec = h->root.u.def.section;
5163 if (input_sec->output_section != NULL)
5166 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
5167 input_sec->output_section);
5168 if (sym.st_shndx == (unsigned short) -1)
5170 (*_bfd_error_handler)
5171 (_("%s: could not find output section %s for input section %s"),
5172 bfd_get_filename (finfo->output_bfd),
5173 input_sec->output_section->name,
5175 eoinfo->failed = true;
5179 /* ELF symbols in relocateable files are section relative,
5180 but in nonrelocateable files they are virtual
5182 sym.st_value = h->root.u.def.value + input_sec->output_offset;
5183 if (! finfo->info->relocateable)
5184 sym.st_value += input_sec->output_section->vma;
5188 BFD_ASSERT (input_sec->owner == NULL
5189 || (input_sec->owner->flags & DYNAMIC) != 0);
5190 sym.st_shndx = SHN_UNDEF;
5191 input_sec = bfd_und_section_ptr;
5196 case bfd_link_hash_common:
5197 input_sec = h->root.u.c.p->section;
5198 sym.st_shndx = SHN_COMMON;
5199 sym.st_value = 1 << h->root.u.c.p->alignment_power;
5202 case bfd_link_hash_indirect:
5203 /* These symbols are created by symbol versioning. They point
5204 to the decorated version of the name. For example, if the
5205 symbol foo@@GNU_1.2 is the default, which should be used when
5206 foo is used with no version, then we add an indirect symbol
5207 foo which points to foo@@GNU_1.2. We ignore these symbols,
5208 since the indirected symbol is already in the hash table. */
5211 case bfd_link_hash_warning:
5212 /* We can't represent these symbols in ELF, although a warning
5213 symbol may have come from a .gnu.warning.SYMBOL section. We
5214 just put the target symbol in the hash table. If the target
5215 symbol does not really exist, don't do anything. */
5216 if (h->root.u.i.link->type == bfd_link_hash_new)
5218 return (elf_link_output_extsym
5219 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
5222 /* Give the processor backend a chance to tweak the symbol value,
5223 and also to finish up anything that needs to be done for this
5225 if ((h->dynindx != -1
5226 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5227 && elf_hash_table (finfo->info)->dynamic_sections_created)
5229 struct elf_backend_data *bed;
5231 bed = get_elf_backend_data (finfo->output_bfd);
5232 if (! ((*bed->elf_backend_finish_dynamic_symbol)
5233 (finfo->output_bfd, finfo->info, h, &sym)))
5235 eoinfo->failed = true;
5240 /* If we are marking the symbol as undefined, and there are no
5241 non-weak references to this symbol from a regular object, then
5242 mark the symbol as weak undefined; if there are non-weak
5243 references, mark the symbol as strong. We can't do this earlier,
5244 because it might not be marked as undefined until the
5245 finish_dynamic_symbol routine gets through with it. */
5246 if (sym.st_shndx == SHN_UNDEF
5247 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
5248 && (ELF_ST_BIND(sym.st_info) == STB_GLOBAL
5249 || ELF_ST_BIND(sym.st_info) == STB_WEAK))
5253 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
5254 bindtype = STB_GLOBAL;
5256 bindtype = STB_WEAK;
5257 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
5260 /* If a symbol is not defined locally, we clear the visibility
5262 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5263 sym.st_other ^= ELF_ST_VISIBILITY(sym.st_other);
5265 /* If this symbol should be put in the .dynsym section, then put it
5266 there now. We have already know the symbol index. We also fill
5267 in the entry in the .hash section. */
5268 if (h->dynindx != -1
5269 && elf_hash_table (finfo->info)->dynamic_sections_created)
5273 size_t hash_entry_size;
5274 bfd_byte *bucketpos;
5277 sym.st_name = h->dynstr_index;
5279 elf_swap_symbol_out (finfo->output_bfd, &sym,
5280 (PTR) (((Elf_External_Sym *)
5281 finfo->dynsym_sec->contents)
5284 bucketcount = elf_hash_table (finfo->info)->bucketcount;
5285 bucket = h->elf_hash_value % bucketcount;
5287 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
5288 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
5289 + (bucket + 2) * hash_entry_size);
5290 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
5291 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
5292 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
5293 ((bfd_byte *) finfo->hash_sec->contents
5294 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
5296 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
5298 Elf_Internal_Versym iversym;
5300 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5302 if (h->verinfo.verdef == NULL)
5303 iversym.vs_vers = 0;
5305 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
5309 if (h->verinfo.vertree == NULL)
5310 iversym.vs_vers = 1;
5312 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
5315 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
5316 iversym.vs_vers |= VERSYM_HIDDEN;
5318 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym,
5319 (((Elf_External_Versym *)
5320 finfo->symver_sec->contents)
5325 /* If we're stripping it, then it was just a dynamic symbol, and
5326 there's nothing else to do. */
5330 h->indx = bfd_get_symcount (finfo->output_bfd);
5332 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
5334 eoinfo->failed = true;
5341 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5342 originated from the section given by INPUT_REL_HDR) to the
5346 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
5349 asection *input_section;
5350 Elf_Internal_Shdr *input_rel_hdr;
5351 Elf_Internal_Rela *internal_relocs;
5353 Elf_Internal_Rela *irela;
5354 Elf_Internal_Rela *irelaend;
5355 Elf_Internal_Shdr *output_rel_hdr;
5356 asection *output_section;
5357 unsigned int *rel_countp = NULL;
5358 struct elf_backend_data *bed;
5360 output_section = input_section->output_section;
5361 output_rel_hdr = NULL;
5363 if (elf_section_data (output_section)->rel_hdr.sh_entsize
5364 == input_rel_hdr->sh_entsize)
5366 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
5367 rel_countp = &elf_section_data (output_section)->rel_count;
5369 else if (elf_section_data (output_section)->rel_hdr2
5370 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
5371 == input_rel_hdr->sh_entsize))
5373 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
5374 rel_countp = &elf_section_data (output_section)->rel_count2;
5377 BFD_ASSERT (output_rel_hdr != NULL);
5379 bed = get_elf_backend_data (output_bfd);
5380 irela = internal_relocs;
5381 irelaend = irela + input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5382 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
5384 Elf_External_Rel *erel;
5386 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
5387 for (; irela < irelaend; irela++, erel++)
5389 Elf_Internal_Rel irel;
5391 irel.r_offset = irela->r_offset;
5392 irel.r_info = irela->r_info;
5393 BFD_ASSERT (irela->r_addend == 0);
5394 if (bed->s->swap_reloc_out)
5395 (*bed->s->swap_reloc_out) (output_bfd, &irel, (PTR) erel);
5397 elf_swap_reloc_out (output_bfd, &irel, erel);
5402 Elf_External_Rela *erela;
5404 BFD_ASSERT (input_rel_hdr->sh_entsize
5405 == sizeof (Elf_External_Rela));
5406 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
5407 for (; irela < irelaend; irela++, erela++)
5408 if (bed->s->swap_reloca_out)
5409 (*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
5411 elf_swap_reloca_out (output_bfd, irela, erela);
5414 /* Bump the counter, so that we know where to add the next set of
5416 *rel_countp += input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5419 /* Link an input file into the linker output file. This function
5420 handles all the sections and relocations of the input file at once.
5421 This is so that we only have to read the local symbols once, and
5422 don't have to keep them in memory. */
5425 elf_link_input_bfd (finfo, input_bfd)
5426 struct elf_final_link_info *finfo;
5429 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
5430 bfd *, asection *, bfd_byte *,
5431 Elf_Internal_Rela *,
5432 Elf_Internal_Sym *, asection **));
5434 Elf_Internal_Shdr *symtab_hdr;
5437 Elf_External_Sym *external_syms;
5438 Elf_External_Sym *esym;
5439 Elf_External_Sym *esymend;
5440 Elf_Internal_Sym *isym;
5442 asection **ppsection;
5444 struct elf_backend_data *bed;
5446 output_bfd = finfo->output_bfd;
5447 bed = get_elf_backend_data (output_bfd);
5448 relocate_section = bed->elf_backend_relocate_section;
5450 /* If this is a dynamic object, we don't want to do anything here:
5451 we don't want the local symbols, and we don't want the section
5453 if ((input_bfd->flags & DYNAMIC) != 0)
5456 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5457 if (elf_bad_symtab (input_bfd))
5459 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
5464 locsymcount = symtab_hdr->sh_info;
5465 extsymoff = symtab_hdr->sh_info;
5468 /* Read the local symbols. */
5469 if (symtab_hdr->contents != NULL)
5470 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
5471 else if (locsymcount == 0)
5472 external_syms = NULL;
5475 external_syms = finfo->external_syms;
5476 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
5477 || (bfd_read (external_syms, sizeof (Elf_External_Sym),
5478 locsymcount, input_bfd)
5479 != locsymcount * sizeof (Elf_External_Sym)))
5483 /* Swap in the local symbols and write out the ones which we know
5484 are going into the output file. */
5485 esym = external_syms;
5486 esymend = esym + locsymcount;
5487 isym = finfo->internal_syms;
5488 pindex = finfo->indices;
5489 ppsection = finfo->sections;
5490 for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
5494 Elf_Internal_Sym osym;
5496 elf_swap_symbol_in (input_bfd, esym, isym);
5499 if (elf_bad_symtab (input_bfd))
5501 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
5508 if (isym->st_shndx == SHN_UNDEF)
5509 isec = bfd_und_section_ptr;
5510 else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
5511 isec = section_from_elf_index (input_bfd, isym->st_shndx);
5512 else if (isym->st_shndx == SHN_ABS)
5513 isec = bfd_abs_section_ptr;
5514 else if (isym->st_shndx == SHN_COMMON)
5515 isec = bfd_com_section_ptr;
5524 /* Don't output the first, undefined, symbol. */
5525 if (esym == external_syms)
5528 /* If we are stripping all symbols, we don't want to output this
5530 if (finfo->info->strip == strip_all)
5533 /* We never output section symbols. Instead, we use the section
5534 symbol of the corresponding section in the output file. */
5535 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5538 /* If we are discarding all local symbols, we don't want to
5539 output this one. If we are generating a relocateable output
5540 file, then some of the local symbols may be required by
5541 relocs; we output them below as we discover that they are
5543 if (finfo->info->discard == discard_all)
5546 /* If this symbol is defined in a section which we are
5547 discarding, we don't need to keep it, but note that
5548 linker_mark is only reliable for sections that have contents.
5549 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5550 as well as linker_mark. */
5551 if (isym->st_shndx > 0
5552 && isym->st_shndx < SHN_LORESERVE
5554 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
5555 || (! finfo->info->relocateable
5556 && (isec->flags & SEC_EXCLUDE) != 0)))
5559 /* Get the name of the symbol. */
5560 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
5565 /* See if we are discarding symbols with this name. */
5566 if ((finfo->info->strip == strip_some
5567 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
5569 || (finfo->info->discard == discard_l
5570 && bfd_is_local_label_name (input_bfd, name)))
5573 /* If we get here, we are going to output this symbol. */
5577 /* Adjust the section index for the output file. */
5578 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
5579 isec->output_section);
5580 if (osym.st_shndx == (unsigned short) -1)
5583 *pindex = bfd_get_symcount (output_bfd);
5585 /* ELF symbols in relocateable files are section relative, but
5586 in executable files they are virtual addresses. Note that
5587 this code assumes that all ELF sections have an associated
5588 BFD section with a reasonable value for output_offset; below
5589 we assume that they also have a reasonable value for
5590 output_section. Any special sections must be set up to meet
5591 these requirements. */
5592 osym.st_value += isec->output_offset;
5593 if (! finfo->info->relocateable)
5594 osym.st_value += isec->output_section->vma;
5596 if (! elf_link_output_sym (finfo, name, &osym, isec))
5600 /* Relocate the contents of each section. */
5601 for (o = input_bfd->sections; o != NULL; o = o->next)
5605 if (! o->linker_mark)
5607 /* This section was omitted from the link. */
5611 if ((o->flags & SEC_HAS_CONTENTS) == 0
5612 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
5615 if ((o->flags & SEC_LINKER_CREATED) != 0)
5617 /* Section was created by elf_link_create_dynamic_sections
5622 /* Get the contents of the section. They have been cached by a
5623 relaxation routine. Note that o is a section in an input
5624 file, so the contents field will not have been set by any of
5625 the routines which work on output files. */
5626 if (elf_section_data (o)->this_hdr.contents != NULL)
5627 contents = elf_section_data (o)->this_hdr.contents;
5630 contents = finfo->contents;
5631 if (! bfd_get_section_contents (input_bfd, o, contents,
5632 (file_ptr) 0, o->_raw_size))
5636 if ((o->flags & SEC_RELOC) != 0)
5638 Elf_Internal_Rela *internal_relocs;
5640 /* Get the swapped relocs. */
5641 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
5642 (input_bfd, o, finfo->external_relocs,
5643 finfo->internal_relocs, false));
5644 if (internal_relocs == NULL
5645 && o->reloc_count > 0)
5648 /* Relocate the section by invoking a back end routine.
5650 The back end routine is responsible for adjusting the
5651 section contents as necessary, and (if using Rela relocs
5652 and generating a relocateable output file) adjusting the
5653 reloc addend as necessary.
5655 The back end routine does not have to worry about setting
5656 the reloc address or the reloc symbol index.
5658 The back end routine is given a pointer to the swapped in
5659 internal symbols, and can access the hash table entries
5660 for the external symbols via elf_sym_hashes (input_bfd).
5662 When generating relocateable output, the back end routine
5663 must handle STB_LOCAL/STT_SECTION symbols specially. The
5664 output symbol is going to be a section symbol
5665 corresponding to the output section, which will require
5666 the addend to be adjusted. */
5668 if (! (*relocate_section) (output_bfd, finfo->info,
5669 input_bfd, o, contents,
5671 finfo->internal_syms,
5675 if (finfo->info->relocateable || finfo->info->emitrelocations)
5677 Elf_Internal_Rela *irela;
5678 Elf_Internal_Rela *irelaend;
5679 struct elf_link_hash_entry **rel_hash;
5680 Elf_Internal_Shdr *input_rel_hdr;
5682 /* Adjust the reloc addresses and symbol indices. */
5684 irela = internal_relocs;
5686 irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
5687 rel_hash = (elf_section_data (o->output_section)->rel_hashes
5688 + elf_section_data (o->output_section)->rel_count
5689 + elf_section_data (o->output_section)->rel_count2);
5690 for (; irela < irelaend; irela++, rel_hash++)
5692 unsigned long r_symndx;
5693 Elf_Internal_Sym *isym;
5696 irela->r_offset += o->output_offset;
5698 /* Relocs in an executable have to be virtual addresses. */
5699 if (finfo->info->emitrelocations)
5700 irela->r_offset += o->output_section->vma;
5702 r_symndx = ELF_R_SYM (irela->r_info);
5707 if (r_symndx >= locsymcount
5708 || (elf_bad_symtab (input_bfd)
5709 && finfo->sections[r_symndx] == NULL))
5711 struct elf_link_hash_entry *rh;
5714 /* This is a reloc against a global symbol. We
5715 have not yet output all the local symbols, so
5716 we do not know the symbol index of any global
5717 symbol. We set the rel_hash entry for this
5718 reloc to point to the global hash table entry
5719 for this symbol. The symbol index is then
5720 set at the end of elf_bfd_final_link. */
5721 indx = r_symndx - extsymoff;
5722 rh = elf_sym_hashes (input_bfd)[indx];
5723 while (rh->root.type == bfd_link_hash_indirect
5724 || rh->root.type == bfd_link_hash_warning)
5725 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
5727 /* Setting the index to -2 tells
5728 elf_link_output_extsym that this symbol is
5730 BFD_ASSERT (rh->indx < 0);
5738 /* This is a reloc against a local symbol. */
5741 isym = finfo->internal_syms + r_symndx;
5742 sec = finfo->sections[r_symndx];
5743 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5745 /* I suppose the backend ought to fill in the
5746 section of any STT_SECTION symbol against a
5747 processor specific section. If we have
5748 discarded a section, the output_section will
5749 be the absolute section. */
5751 && (bfd_is_abs_section (sec)
5752 || (sec->output_section != NULL
5753 && bfd_is_abs_section (sec->output_section))))
5755 else if (sec == NULL || sec->owner == NULL)
5757 bfd_set_error (bfd_error_bad_value);
5762 r_symndx = sec->output_section->target_index;
5763 BFD_ASSERT (r_symndx != 0);
5768 if (finfo->indices[r_symndx] == -1)
5774 if (finfo->info->strip == strip_all)
5776 /* You can't do ld -r -s. */
5777 bfd_set_error (bfd_error_invalid_operation);
5781 /* This symbol was skipped earlier, but
5782 since it is needed by a reloc, we
5783 must output it now. */
5784 link = symtab_hdr->sh_link;
5785 name = bfd_elf_string_from_elf_section (input_bfd,
5791 osec = sec->output_section;
5793 _bfd_elf_section_from_bfd_section (output_bfd,
5795 if (isym->st_shndx == (unsigned short) -1)
5798 isym->st_value += sec->output_offset;
5799 if (! finfo->info->relocateable)
5800 isym->st_value += osec->vma;
5802 finfo->indices[r_symndx] = bfd_get_symcount (output_bfd);
5804 if (! elf_link_output_sym (finfo, name, isym, sec))
5808 r_symndx = finfo->indices[r_symndx];
5811 irela->r_info = ELF_R_INFO (r_symndx,
5812 ELF_R_TYPE (irela->r_info));
5815 /* Swap out the relocs. */
5816 input_rel_hdr = &elf_section_data (o)->rel_hdr;
5817 elf_link_output_relocs (output_bfd, o,
5821 += input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5822 input_rel_hdr = elf_section_data (o)->rel_hdr2;
5824 elf_link_output_relocs (output_bfd, o,
5830 /* Write out the modified section contents. */
5831 if (elf_section_data (o)->stab_info == NULL)
5833 if (! (o->flags & SEC_EXCLUDE) &&
5834 ! bfd_set_section_contents (output_bfd, o->output_section,
5835 contents, o->output_offset,
5836 (o->_cooked_size != 0
5843 if (! (_bfd_write_section_stabs
5844 (output_bfd, &elf_hash_table (finfo->info)->stab_info,
5845 o, &elf_section_data (o)->stab_info, contents)))
5853 /* Generate a reloc when linking an ELF file. This is a reloc
5854 requested by the linker, and does come from any input file. This
5855 is used to build constructor and destructor tables when linking
5859 elf_reloc_link_order (output_bfd, info, output_section, link_order)
5861 struct bfd_link_info *info;
5862 asection *output_section;
5863 struct bfd_link_order *link_order;
5865 reloc_howto_type *howto;
5869 struct elf_link_hash_entry **rel_hash_ptr;
5870 Elf_Internal_Shdr *rel_hdr;
5871 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
5873 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
5876 bfd_set_error (bfd_error_bad_value);
5880 addend = link_order->u.reloc.p->addend;
5882 /* Figure out the symbol index. */
5883 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
5884 + elf_section_data (output_section)->rel_count
5885 + elf_section_data (output_section)->rel_count2);
5886 if (link_order->type == bfd_section_reloc_link_order)
5888 indx = link_order->u.reloc.p->u.section->target_index;
5889 BFD_ASSERT (indx != 0);
5890 *rel_hash_ptr = NULL;
5894 struct elf_link_hash_entry *h;
5896 /* Treat a reloc against a defined symbol as though it were
5897 actually against the section. */
5898 h = ((struct elf_link_hash_entry *)
5899 bfd_wrapped_link_hash_lookup (output_bfd, info,
5900 link_order->u.reloc.p->u.name,
5901 false, false, true));
5903 && (h->root.type == bfd_link_hash_defined
5904 || h->root.type == bfd_link_hash_defweak))
5908 section = h->root.u.def.section;
5909 indx = section->output_section->target_index;
5910 *rel_hash_ptr = NULL;
5911 /* It seems that we ought to add the symbol value to the
5912 addend here, but in practice it has already been added
5913 because it was passed to constructor_callback. */
5914 addend += section->output_section->vma + section->output_offset;
5918 /* Setting the index to -2 tells elf_link_output_extsym that
5919 this symbol is used by a reloc. */
5926 if (! ((*info->callbacks->unattached_reloc)
5927 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
5928 (asection *) NULL, (bfd_vma) 0)))
5934 /* If this is an inplace reloc, we must write the addend into the
5936 if (howto->partial_inplace && addend != 0)
5939 bfd_reloc_status_type rstat;
5943 size = bfd_get_reloc_size (howto);
5944 buf = (bfd_byte *) bfd_zmalloc (size);
5945 if (buf == (bfd_byte *) NULL)
5947 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
5953 case bfd_reloc_outofrange:
5955 case bfd_reloc_overflow:
5956 if (! ((*info->callbacks->reloc_overflow)
5958 (link_order->type == bfd_section_reloc_link_order
5959 ? bfd_section_name (output_bfd,
5960 link_order->u.reloc.p->u.section)
5961 : link_order->u.reloc.p->u.name),
5962 howto->name, addend, (bfd *) NULL, (asection *) NULL,
5970 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
5971 (file_ptr) link_order->offset, size);
5977 /* The address of a reloc is relative to the section in a
5978 relocateable file, and is a virtual address in an executable
5980 offset = link_order->offset;
5981 if (! info->relocateable)
5982 offset += output_section->vma;
5984 rel_hdr = &elf_section_data (output_section)->rel_hdr;
5986 if (rel_hdr->sh_type == SHT_REL)
5988 Elf_Internal_Rel irel;
5989 Elf_External_Rel *erel;
5991 irel.r_offset = offset;
5992 irel.r_info = ELF_R_INFO (indx, howto->type);
5993 erel = ((Elf_External_Rel *) rel_hdr->contents
5994 + elf_section_data (output_section)->rel_count);
5995 if (bed->s->swap_reloc_out)
5996 (*bed->s->swap_reloc_out) (output_bfd, &irel, (bfd_byte *) erel);
5998 elf_swap_reloc_out (output_bfd, &irel, erel);
6002 Elf_Internal_Rela irela;
6003 Elf_External_Rela *erela;
6005 irela.r_offset = offset;
6006 irela.r_info = ELF_R_INFO (indx, howto->type);
6007 irela.r_addend = addend;
6008 erela = ((Elf_External_Rela *) rel_hdr->contents
6009 + elf_section_data (output_section)->rel_count);
6010 if (bed->s->swap_reloca_out)
6011 (*bed->s->swap_reloca_out) (output_bfd, &irela, (bfd_byte *) erela);
6013 elf_swap_reloca_out (output_bfd, &irela, erela);
6016 ++elf_section_data (output_section)->rel_count;
6022 /* Allocate a pointer to live in a linker created section. */
6025 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
6027 struct bfd_link_info *info;
6028 elf_linker_section_t *lsect;
6029 struct elf_link_hash_entry *h;
6030 const Elf_Internal_Rela *rel;
6032 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
6033 elf_linker_section_pointers_t *linker_section_ptr;
6034 unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
6036 BFD_ASSERT (lsect != NULL);
6038 /* Is this a global symbol? */
6041 /* Has this symbol already been allocated, if so, our work is done */
6042 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6047 ptr_linker_section_ptr = &h->linker_section_pointer;
6048 /* Make sure this symbol is output as a dynamic symbol. */
6049 if (h->dynindx == -1)
6051 if (! elf_link_record_dynamic_symbol (info, h))
6055 if (lsect->rel_section)
6056 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
6059 else /* Allocation of a pointer to a local symbol */
6061 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
6063 /* Allocate a table to hold the local symbols if first time */
6066 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
6067 register unsigned int i;
6069 ptr = (elf_linker_section_pointers_t **)
6070 bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
6075 elf_local_ptr_offsets (abfd) = ptr;
6076 for (i = 0; i < num_symbols; i++)
6077 ptr[i] = (elf_linker_section_pointers_t *)0;
6080 /* Has this symbol already been allocated, if so, our work is done */
6081 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
6086 ptr_linker_section_ptr = &ptr[r_symndx];
6090 /* If we are generating a shared object, we need to
6091 output a R_<xxx>_RELATIVE reloc so that the
6092 dynamic linker can adjust this GOT entry. */
6093 BFD_ASSERT (lsect->rel_section != NULL);
6094 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
6098 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
6099 from internal memory. */
6100 BFD_ASSERT (ptr_linker_section_ptr != NULL);
6101 linker_section_ptr = (elf_linker_section_pointers_t *)
6102 bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
6104 if (!linker_section_ptr)
6107 linker_section_ptr->next = *ptr_linker_section_ptr;
6108 linker_section_ptr->addend = rel->r_addend;
6109 linker_section_ptr->which = lsect->which;
6110 linker_section_ptr->written_address_p = false;
6111 *ptr_linker_section_ptr = linker_section_ptr;
6114 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
6116 linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8);
6117 lsect->hole_offset += ARCH_SIZE / 8;
6118 lsect->sym_offset += ARCH_SIZE / 8;
6119 if (lsect->sym_hash) /* Bump up symbol value if needed */
6121 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
6123 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
6124 lsect->sym_hash->root.root.string,
6125 (long)ARCH_SIZE / 8,
6126 (long)lsect->sym_hash->root.u.def.value);
6132 linker_section_ptr->offset = lsect->section->_raw_size;
6134 lsect->section->_raw_size += ARCH_SIZE / 8;
6137 fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
6138 lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
6146 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
6149 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
6152 /* Fill in the address for a pointer generated in alinker section. */
6155 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
6158 struct bfd_link_info *info;
6159 elf_linker_section_t *lsect;
6160 struct elf_link_hash_entry *h;
6162 const Elf_Internal_Rela *rel;
6165 elf_linker_section_pointers_t *linker_section_ptr;
6167 BFD_ASSERT (lsect != NULL);
6169 if (h != NULL) /* global symbol */
6171 linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6175 BFD_ASSERT (linker_section_ptr != NULL);
6177 if (! elf_hash_table (info)->dynamic_sections_created
6180 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
6182 /* This is actually a static link, or it is a
6183 -Bsymbolic link and the symbol is defined
6184 locally. We must initialize this entry in the
6187 When doing a dynamic link, we create a .rela.<xxx>
6188 relocation entry to initialize the value. This
6189 is done in the finish_dynamic_symbol routine. */
6190 if (!linker_section_ptr->written_address_p)
6192 linker_section_ptr->written_address_p = true;
6193 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6194 lsect->section->contents + linker_section_ptr->offset);
6198 else /* local symbol */
6200 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6201 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
6202 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
6203 linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
6207 BFD_ASSERT (linker_section_ptr != NULL);
6209 /* Write out pointer if it hasn't been rewritten out before */
6210 if (!linker_section_ptr->written_address_p)
6212 linker_section_ptr->written_address_p = true;
6213 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6214 lsect->section->contents + linker_section_ptr->offset);
6218 asection *srel = lsect->rel_section;
6219 Elf_Internal_Rela outrel;
6221 /* We need to generate a relative reloc for the dynamic linker. */
6223 lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
6226 BFD_ASSERT (srel != NULL);
6228 outrel.r_offset = (lsect->section->output_section->vma
6229 + lsect->section->output_offset
6230 + linker_section_ptr->offset);
6231 outrel.r_info = ELF_R_INFO (0, relative_reloc);
6232 outrel.r_addend = 0;
6233 elf_swap_reloca_out (output_bfd, &outrel,
6234 (((Elf_External_Rela *)
6235 lsect->section->contents)
6236 + elf_section_data (lsect->section)->rel_count));
6237 ++elf_section_data (lsect->section)->rel_count;
6242 relocation = (lsect->section->output_offset
6243 + linker_section_ptr->offset
6244 - lsect->hole_offset
6245 - lsect->sym_offset);
6248 fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6249 lsect->name, (long)relocation, (long)relocation);
6252 /* Subtract out the addend, because it will get added back in by the normal
6254 return relocation - linker_section_ptr->addend;
6257 /* Garbage collect unused sections. */
6259 static boolean elf_gc_mark
6260 PARAMS ((struct bfd_link_info *info, asection *sec,
6261 asection * (*gc_mark_hook)
6262 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6263 struct elf_link_hash_entry *, Elf_Internal_Sym *))));
6265 static boolean elf_gc_sweep
6266 PARAMS ((struct bfd_link_info *info,
6267 boolean (*gc_sweep_hook)
6268 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6269 const Elf_Internal_Rela *relocs))));
6271 static boolean elf_gc_sweep_symbol
6272 PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
6274 static boolean elf_gc_allocate_got_offsets
6275 PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
6277 static boolean elf_gc_propagate_vtable_entries_used
6278 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6280 static boolean elf_gc_smash_unused_vtentry_relocs
6281 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6283 /* The mark phase of garbage collection. For a given section, mark
6284 it, and all the sections which define symbols to which it refers. */
6287 elf_gc_mark (info, sec, gc_mark_hook)
6288 struct bfd_link_info *info;
6290 asection * (*gc_mark_hook)
6291 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6292 struct elf_link_hash_entry *, Elf_Internal_Sym *));
6298 /* Look through the section relocs. */
6300 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
6302 Elf_Internal_Rela *relstart, *rel, *relend;
6303 Elf_Internal_Shdr *symtab_hdr;
6304 struct elf_link_hash_entry **sym_hashes;
6307 Elf_External_Sym *locsyms, *freesyms = NULL;
6308 bfd *input_bfd = sec->owner;
6309 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
6311 /* GCFIXME: how to arrange so that relocs and symbols are not
6312 reread continually? */
6314 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6315 sym_hashes = elf_sym_hashes (input_bfd);
6317 /* Read the local symbols. */
6318 if (elf_bad_symtab (input_bfd))
6320 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6324 extsymoff = nlocsyms = symtab_hdr->sh_info;
6325 if (symtab_hdr->contents)
6326 locsyms = (Elf_External_Sym *) symtab_hdr->contents;
6327 else if (nlocsyms == 0)
6331 locsyms = freesyms =
6332 bfd_malloc (nlocsyms * sizeof (Elf_External_Sym));
6333 if (freesyms == NULL
6334 || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
6335 || (bfd_read (locsyms, sizeof (Elf_External_Sym),
6336 nlocsyms, input_bfd)
6337 != nlocsyms * sizeof (Elf_External_Sym)))
6344 /* Read the relocations. */
6345 relstart = (NAME(_bfd_elf,link_read_relocs)
6346 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
6347 info->keep_memory));
6348 if (relstart == NULL)
6353 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6355 for (rel = relstart; rel < relend; rel++)
6357 unsigned long r_symndx;
6359 struct elf_link_hash_entry *h;
6362 r_symndx = ELF_R_SYM (rel->r_info);
6366 if (elf_bad_symtab (sec->owner))
6368 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6369 if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
6370 rsec = (*gc_mark_hook)(sec->owner, info, rel, NULL, &s);
6373 h = sym_hashes[r_symndx - extsymoff];
6374 rsec = (*gc_mark_hook)(sec->owner, info, rel, h, NULL);
6377 else if (r_symndx >= nlocsyms)
6379 h = sym_hashes[r_symndx - extsymoff];
6380 rsec = (*gc_mark_hook)(sec->owner, info, rel, h, NULL);
6384 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6385 rsec = (*gc_mark_hook)(sec->owner, info, rel, NULL, &s);
6388 if (rsec && !rsec->gc_mark)
6389 if (!elf_gc_mark (info, rsec, gc_mark_hook))
6397 if (!info->keep_memory)
6407 /* The sweep phase of garbage collection. Remove all garbage sections. */
6410 elf_gc_sweep (info, gc_sweep_hook)
6411 struct bfd_link_info *info;
6412 boolean (*gc_sweep_hook)
6413 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6414 const Elf_Internal_Rela *relocs));
6418 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6422 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
6425 for (o = sub->sections; o != NULL; o = o->next)
6427 /* Keep special sections. Keep .debug sections. */
6428 if ((o->flags & SEC_LINKER_CREATED)
6429 || (o->flags & SEC_DEBUGGING))
6435 /* Skip sweeping sections already excluded. */
6436 if (o->flags & SEC_EXCLUDE)
6439 /* Since this is early in the link process, it is simple
6440 to remove a section from the output. */
6441 o->flags |= SEC_EXCLUDE;
6443 /* But we also have to update some of the relocation
6444 info we collected before. */
6446 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
6448 Elf_Internal_Rela *internal_relocs;
6451 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6452 (o->owner, o, NULL, NULL, info->keep_memory));
6453 if (internal_relocs == NULL)
6456 r = (*gc_sweep_hook)(o->owner, info, o, internal_relocs);
6458 if (!info->keep_memory)
6459 free (internal_relocs);
6467 /* Remove the symbols that were in the swept sections from the dynamic
6468 symbol table. GCFIXME: Anyone know how to get them out of the
6469 static symbol table as well? */
6473 elf_link_hash_traverse (elf_hash_table (info),
6474 elf_gc_sweep_symbol,
6477 elf_hash_table (info)->dynsymcount = i;
6483 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6486 elf_gc_sweep_symbol (h, idxptr)
6487 struct elf_link_hash_entry *h;
6490 int *idx = (int *) idxptr;
6492 if (h->dynindx != -1
6493 && ((h->root.type != bfd_link_hash_defined
6494 && h->root.type != bfd_link_hash_defweak)
6495 || h->root.u.def.section->gc_mark))
6496 h->dynindx = (*idx)++;
6501 /* Propogate collected vtable information. This is called through
6502 elf_link_hash_traverse. */
6505 elf_gc_propagate_vtable_entries_used (h, okp)
6506 struct elf_link_hash_entry *h;
6509 /* Those that are not vtables. */
6510 if (h->vtable_parent == NULL)
6513 /* Those vtables that do not have parents, we cannot merge. */
6514 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
6517 /* If we've already been done, exit. */
6518 if (h->vtable_entries_used && h->vtable_entries_used[-1])
6521 /* Make sure the parent's table is up to date. */
6522 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
6524 if (h->vtable_entries_used == NULL)
6526 /* None of this table's entries were referenced. Re-use the
6528 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
6529 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
6536 /* Or the parent's entries into ours. */
6537 cu = h->vtable_entries_used;
6539 pu = h->vtable_parent->vtable_entries_used;
6542 n = h->vtable_parent->vtable_entries_size / FILE_ALIGN;
6545 if (*pu) *cu = true;
6555 elf_gc_smash_unused_vtentry_relocs (h, okp)
6556 struct elf_link_hash_entry *h;
6560 bfd_vma hstart, hend;
6561 Elf_Internal_Rela *relstart, *relend, *rel;
6562 struct elf_backend_data *bed;
6564 /* Take care of both those symbols that do not describe vtables as
6565 well as those that are not loaded. */
6566 if (h->vtable_parent == NULL)
6569 BFD_ASSERT (h->root.type == bfd_link_hash_defined
6570 || h->root.type == bfd_link_hash_defweak);
6572 sec = h->root.u.def.section;
6573 hstart = h->root.u.def.value;
6574 hend = hstart + h->size;
6576 relstart = (NAME(_bfd_elf,link_read_relocs)
6577 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
6579 return *(boolean *)okp = false;
6580 bed = get_elf_backend_data (sec->owner);
6581 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6583 for (rel = relstart; rel < relend; ++rel)
6584 if (rel->r_offset >= hstart && rel->r_offset < hend)
6586 /* If the entry is in use, do nothing. */
6587 if (h->vtable_entries_used
6588 && (rel->r_offset - hstart) < h->vtable_entries_size)
6590 bfd_vma entry = (rel->r_offset - hstart) / FILE_ALIGN;
6591 if (h->vtable_entries_used[entry])
6594 /* Otherwise, kill it. */
6595 rel->r_offset = rel->r_info = rel->r_addend = 0;
6601 /* Do mark and sweep of unused sections. */
6604 elf_gc_sections (abfd, info)
6606 struct bfd_link_info *info;
6610 asection * (*gc_mark_hook)
6611 PARAMS ((bfd *abfd, struct bfd_link_info *, Elf_Internal_Rela *,
6612 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
6614 if (!get_elf_backend_data (abfd)->can_gc_sections
6615 || info->relocateable || info->emitrelocations
6616 || elf_hash_table (info)->dynamic_sections_created)
6619 /* Apply transitive closure to the vtable entry usage info. */
6620 elf_link_hash_traverse (elf_hash_table (info),
6621 elf_gc_propagate_vtable_entries_used,
6626 /* Kill the vtable relocations that were not used. */
6627 elf_link_hash_traverse (elf_hash_table (info),
6628 elf_gc_smash_unused_vtentry_relocs,
6633 /* Grovel through relocs to find out who stays ... */
6635 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
6636 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6640 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
6643 for (o = sub->sections; o != NULL; o = o->next)
6645 if (o->flags & SEC_KEEP)
6646 if (!elf_gc_mark (info, o, gc_mark_hook))
6651 /* ... and mark SEC_EXCLUDE for those that go. */
6652 if (!elf_gc_sweep(info, get_elf_backend_data (abfd)->gc_sweep_hook))
6658 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6661 elf_gc_record_vtinherit (abfd, sec, h, offset)
6664 struct elf_link_hash_entry *h;
6667 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
6668 struct elf_link_hash_entry **search, *child;
6669 bfd_size_type extsymcount;
6671 /* The sh_info field of the symtab header tells us where the
6672 external symbols start. We don't care about the local symbols at
6674 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
6675 if (!elf_bad_symtab (abfd))
6676 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
6678 sym_hashes = elf_sym_hashes (abfd);
6679 sym_hashes_end = sym_hashes + extsymcount;
6681 /* Hunt down the child symbol, which is in this section at the same
6682 offset as the relocation. */
6683 for (search = sym_hashes; search != sym_hashes_end; ++search)
6685 if ((child = *search) != NULL
6686 && (child->root.type == bfd_link_hash_defined
6687 || child->root.type == bfd_link_hash_defweak)
6688 && child->root.u.def.section == sec
6689 && child->root.u.def.value == offset)
6693 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
6694 bfd_get_filename (abfd), sec->name,
6695 (unsigned long)offset);
6696 bfd_set_error (bfd_error_invalid_operation);
6702 /* This *should* only be the absolute section. It could potentially
6703 be that someone has defined a non-global vtable though, which
6704 would be bad. It isn't worth paging in the local symbols to be
6705 sure though; that case should simply be handled by the assembler. */
6707 child->vtable_parent = (struct elf_link_hash_entry *) -1;
6710 child->vtable_parent = h;
6715 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6718 elf_gc_record_vtentry (abfd, sec, h, addend)
6719 bfd *abfd ATTRIBUTE_UNUSED;
6720 asection *sec ATTRIBUTE_UNUSED;
6721 struct elf_link_hash_entry *h;
6724 if (addend >= h->vtable_entries_size)
6727 boolean *ptr = h->vtable_entries_used;
6729 /* While the symbol is undefined, we have to be prepared to handle
6731 if (h->root.type == bfd_link_hash_undefined)
6738 /* Oops! We've got a reference past the defined end of
6739 the table. This is probably a bug -- shall we warn? */
6744 /* Allocate one extra entry for use as a "done" flag for the
6745 consolidation pass. */
6746 bytes = (size / FILE_ALIGN + 1) * sizeof (boolean);
6750 ptr = bfd_realloc (ptr - 1, bytes);
6756 oldbytes = (h->vtable_entries_size/FILE_ALIGN + 1) * sizeof (boolean);
6757 memset (((char *)ptr) + oldbytes, 0, bytes - oldbytes);
6761 ptr = bfd_zmalloc (bytes);
6766 /* And arrange for that done flag to be at index -1. */
6767 h->vtable_entries_used = ptr + 1;
6768 h->vtable_entries_size = size;
6771 h->vtable_entries_used[addend / FILE_ALIGN] = true;
6776 /* And an accompanying bit to work out final got entry offsets once
6777 we're done. Should be called from final_link. */
6780 elf_gc_common_finalize_got_offsets (abfd, info)
6782 struct bfd_link_info *info;
6785 struct elf_backend_data *bed = get_elf_backend_data (abfd);
6788 /* The GOT offset is relative to the .got section, but the GOT header is
6789 put into the .got.plt section, if the backend uses it. */
6790 if (bed->want_got_plt)
6793 gotoff = bed->got_header_size;
6795 /* Do the local .got entries first. */
6796 for (i = info->input_bfds; i; i = i->link_next)
6798 bfd_signed_vma *local_got;
6799 bfd_size_type j, locsymcount;
6800 Elf_Internal_Shdr *symtab_hdr;
6802 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
6805 local_got = elf_local_got_refcounts (i);
6809 symtab_hdr = &elf_tdata (i)->symtab_hdr;
6810 if (elf_bad_symtab (i))
6811 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6813 locsymcount = symtab_hdr->sh_info;
6815 for (j = 0; j < locsymcount; ++j)
6817 if (local_got[j] > 0)
6819 local_got[j] = gotoff;
6820 gotoff += ARCH_SIZE / 8;
6823 local_got[j] = (bfd_vma) -1;
6827 /* Then the global .got entries. .plt refcounts are handled by
6828 adjust_dynamic_symbol */
6829 elf_link_hash_traverse (elf_hash_table (info),
6830 elf_gc_allocate_got_offsets,
6835 /* We need a special top-level link routine to convert got reference counts
6836 to real got offsets. */
6839 elf_gc_allocate_got_offsets (h, offarg)
6840 struct elf_link_hash_entry *h;
6843 bfd_vma *off = (bfd_vma *) offarg;
6845 if (h->got.refcount > 0)
6847 h->got.offset = off[0];
6848 off[0] += ARCH_SIZE / 8;
6851 h->got.offset = (bfd_vma) -1;
6856 /* Many folk need no more in the way of final link than this, once
6857 got entry reference counting is enabled. */
6860 elf_gc_common_final_link (abfd, info)
6862 struct bfd_link_info *info;
6864 if (!elf_gc_common_finalize_got_offsets (abfd, info))
6867 /* Invoke the regular ELF backend linker to do all the work. */
6868 return elf_bfd_final_link (abfd, info);
6871 /* This function will be called though elf_link_hash_traverse to store
6872 all hash value of the exported symbols in an array. */
6875 elf_collect_hash_codes (h, data)
6876 struct elf_link_hash_entry *h;
6879 unsigned long **valuep = (unsigned long **) data;
6885 /* Ignore indirect symbols. These are added by the versioning code. */
6886 if (h->dynindx == -1)
6889 name = h->root.root.string;
6890 p = strchr (name, ELF_VER_CHR);
6893 alc = bfd_malloc (p - name + 1);
6894 memcpy (alc, name, p - name);
6895 alc[p - name] = '\0';
6899 /* Compute the hash value. */
6900 ha = bfd_elf_hash (name);
6902 /* Store the found hash value in the array given as the argument. */
6905 /* And store it in the struct so that we can put it in the hash table
6907 h->elf_hash_value = ha;