2 Copyright 1995, 1996, 1997 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
*));
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_link_renumber_dynsyms
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
54 /* Given an ELF BFD, add symbols to the global hash table as
58 elf_bfd_link_add_symbols (abfd
, info
)
60 struct bfd_link_info
*info
;
62 switch (bfd_get_format (abfd
))
65 return elf_link_add_object_symbols (abfd
, info
);
67 return elf_link_add_archive_symbols (abfd
, info
);
69 bfd_set_error (bfd_error_wrong_format
);
75 /* Add symbols from an ELF archive file to the linker hash table. We
76 don't use _bfd_generic_link_add_archive_symbols because of a
77 problem which arises on UnixWare. The UnixWare libc.so is an
78 archive which includes an entry libc.so.1 which defines a bunch of
79 symbols. The libc.so archive also includes a number of other
80 object files, which also define symbols, some of which are the same
81 as those defined in libc.so.1. Correct linking requires that we
82 consider each object file in turn, and include it if it defines any
83 symbols we need. _bfd_generic_link_add_archive_symbols does not do
84 this; it looks through the list of undefined symbols, and includes
85 any object file which defines them. When this algorithm is used on
86 UnixWare, it winds up pulling in libc.so.1 early and defining a
87 bunch of symbols. This means that some of the other objects in the
88 archive are not included in the link, which is incorrect since they
89 precede libc.so.1 in the archive.
91 Fortunately, ELF archive handling is simpler than that done by
92 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
93 oddities. In ELF, if we find a symbol in the archive map, and the
94 symbol is currently undefined, we know that we must pull in that
97 Unfortunately, we do have to make multiple passes over the symbol
98 table until nothing further is resolved. */
101 elf_link_add_archive_symbols (abfd
, info
)
103 struct bfd_link_info
*info
;
106 boolean
*defined
= NULL
;
107 boolean
*included
= NULL
;
111 if (! bfd_has_map (abfd
))
113 /* An empty archive is a special case. */
114 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
116 bfd_set_error (bfd_error_no_armap
);
120 /* Keep track of all symbols we know to be already defined, and all
121 files we know to be already included. This is to speed up the
122 second and subsequent passes. */
123 c
= bfd_ardata (abfd
)->symdef_count
;
126 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
127 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
128 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
130 memset (defined
, 0, c
* sizeof (boolean
));
131 memset (included
, 0, c
* sizeof (boolean
));
133 symdefs
= bfd_ardata (abfd
)->symdefs
;
146 symdefend
= symdef
+ c
;
147 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
149 struct elf_link_hash_entry
*h
;
151 struct bfd_link_hash_entry
*undefs_tail
;
154 if (defined
[i
] || included
[i
])
156 if (symdef
->file_offset
== last
)
162 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
163 false, false, false);
169 /* If this is a default version (the name contains @@),
170 look up the symbol again without the version. The
171 effect is that references to the symbol without the
172 version will be matched by the default symbol in the
175 p
= strchr (symdef
->name
, ELF_VER_CHR
);
176 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
179 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
182 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
183 copy
[p
- symdef
->name
] = '\0';
185 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
186 false, false, false);
188 bfd_release (abfd
, copy
);
194 if (h
->root
.type
!= bfd_link_hash_undefined
)
196 if (h
->root
.type
!= bfd_link_hash_undefweak
)
201 /* We need to include this archive member. */
203 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
204 if (element
== (bfd
*) NULL
)
207 if (! bfd_check_format (element
, bfd_object
))
210 /* Doublecheck that we have not included this object
211 already--it should be impossible, but there may be
212 something wrong with the archive. */
213 if (element
->archive_pass
!= 0)
215 bfd_set_error (bfd_error_bad_value
);
218 element
->archive_pass
= 1;
220 undefs_tail
= info
->hash
->undefs_tail
;
222 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
225 if (! elf_link_add_object_symbols (element
, info
))
228 /* If there are any new undefined symbols, we need to make
229 another pass through the archive in order to see whether
230 they can be defined. FIXME: This isn't perfect, because
231 common symbols wind up on undefs_tail and because an
232 undefined symbol which is defined later on in this pass
233 does not require another pass. This isn't a bug, but it
234 does make the code less efficient than it could be. */
235 if (undefs_tail
!= info
->hash
->undefs_tail
)
238 /* Look backward to mark all symbols from this object file
239 which we have already seen in this pass. */
243 included
[mark
] = true;
248 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
250 /* We mark subsequent symbols from this object file as we go
251 on through the loop. */
252 last
= symdef
->file_offset
;
263 if (defined
!= (boolean
*) NULL
)
265 if (included
!= (boolean
*) NULL
)
270 /* This function is called when we want to define a new symbol. It
271 handles the various cases which arise when we find a definition in
272 a dynamic object, or when there is already a definition in a
273 dynamic object. The new symbol is described by NAME, SYM, PSEC,
274 and PVALUE. We set SYM_HASH to the hash table entry. We set
275 OVERRIDE if the old symbol is overriding a new definition. We set
276 TYPE_CHANGE_OK if it is OK for the type to change. We set
277 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
278 change, we mean that we shouldn't warn if the type or size does
282 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
283 override
, type_change_ok
, size_change_ok
)
285 struct bfd_link_info
*info
;
287 Elf_Internal_Sym
*sym
;
290 struct elf_link_hash_entry
**sym_hash
;
292 boolean
*type_change_ok
;
293 boolean
*size_change_ok
;
296 struct elf_link_hash_entry
*h
;
299 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
302 *type_change_ok
= false;
303 *size_change_ok
= false;
306 bind
= ELF_ST_BIND (sym
->st_info
);
308 if (! bfd_is_und_section (sec
))
309 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
311 h
= ((struct elf_link_hash_entry
*)
312 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
317 /* This code is for coping with dynamic objects, and is only useful
318 if we are doing an ELF link. */
319 if (info
->hash
->creator
!= abfd
->xvec
)
322 /* For merging, we only care about real symbols. */
324 while (h
->root
.type
== bfd_link_hash_indirect
325 || h
->root
.type
== bfd_link_hash_warning
)
326 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
328 /* If we just created the symbol, mark it as being an ELF symbol.
329 Other than that, there is nothing to do--there is no merge issue
330 with a newly defined symbol--so we just return. */
332 if (h
->root
.type
== bfd_link_hash_new
)
334 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
338 /* OLDBFD is a BFD associated with the existing symbol. */
340 switch (h
->root
.type
)
346 case bfd_link_hash_undefined
:
347 case bfd_link_hash_undefweak
:
348 oldbfd
= h
->root
.u
.undef
.abfd
;
351 case bfd_link_hash_defined
:
352 case bfd_link_hash_defweak
:
353 oldbfd
= h
->root
.u
.def
.section
->owner
;
356 case bfd_link_hash_common
:
357 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
361 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
362 respectively, is from a dynamic object. */
364 if ((abfd
->flags
& DYNAMIC
) != 0)
369 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
374 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
375 respectively, appear to be a definition rather than reference. */
377 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
382 if (h
->root
.type
== bfd_link_hash_undefined
383 || h
->root
.type
== bfd_link_hash_undefweak
384 || h
->root
.type
== bfd_link_hash_common
)
389 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
390 symbol, respectively, appears to be a common symbol in a dynamic
391 object. If a symbol appears in an uninitialized section, and is
392 not weak, and is not a function, then it may be a common symbol
393 which was resolved when the dynamic object was created. We want
394 to treat such symbols specially, because they raise special
395 considerations when setting the symbol size: if the symbol
396 appears as a common symbol in a regular object, and the size in
397 the regular object is larger, we must make sure that we use the
398 larger size. This problematic case can always be avoided in C,
399 but it must be handled correctly when using Fortran shared
402 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
403 likewise for OLDDYNCOMMON and OLDDEF.
405 Note that this test is just a heuristic, and that it is quite
406 possible to have an uninitialized symbol in a shared object which
407 is really a definition, rather than a common symbol. This could
408 lead to some minor confusion when the symbol really is a common
409 symbol in some regular object. However, I think it will be
414 && (sec
->flags
& SEC_ALLOC
) != 0
415 && (sec
->flags
& SEC_LOAD
) == 0
418 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
421 newdyncommon
= false;
425 && h
->root
.type
== bfd_link_hash_defined
426 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
427 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
428 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
430 && h
->type
!= STT_FUNC
)
433 olddyncommon
= false;
435 /* It's OK to change the type if either the existing symbol or the
436 new symbol is weak. */
438 if (h
->root
.type
== bfd_link_hash_defweak
439 || h
->root
.type
== bfd_link_hash_undefweak
441 *type_change_ok
= true;
443 /* It's OK to change the size if either the existing symbol or the
444 new symbol is weak, or if the old symbol is undefined. */
447 || h
->root
.type
== bfd_link_hash_undefined
)
448 *size_change_ok
= true;
450 /* If both the old and the new symbols look like common symbols in a
451 dynamic object, set the size of the symbol to the larger of the
456 && sym
->st_size
!= h
->size
)
458 /* Since we think we have two common symbols, issue a multiple
459 common warning if desired. Note that we only warn if the
460 size is different. If the size is the same, we simply let
461 the old symbol override the new one as normally happens with
462 symbols defined in dynamic objects. */
464 if (! ((*info
->callbacks
->multiple_common
)
465 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
466 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
469 if (sym
->st_size
> h
->size
)
470 h
->size
= sym
->st_size
;
472 *size_change_ok
= true;
475 /* If we are looking at a dynamic object, and we have found a
476 definition, we need to see if the symbol was already defined by
477 some other object. If so, we want to use the existing
478 definition, and we do not want to report a multiple symbol
479 definition error; we do this by clobbering *PSEC to be
482 We treat a common symbol as a definition if the symbol in the
483 shared library is a function, since common symbols always
484 represent variables; this can cause confusion in principle, but
485 any such confusion would seem to indicate an erroneous program or
486 shared library. We also permit a common symbol in a regular
487 object to override a weak symbol in a shared object. */
492 || (h
->root
.type
== bfd_link_hash_common
494 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
498 newdyncommon
= false;
500 *psec
= sec
= bfd_und_section_ptr
;
501 *size_change_ok
= true;
503 /* If we get here when the old symbol is a common symbol, then
504 we are explicitly letting it override a weak symbol or
505 function in a dynamic object, and we don't want to warn about
506 a type change. If the old symbol is a defined symbol, a type
507 change warning may still be appropriate. */
509 if (h
->root
.type
== bfd_link_hash_common
)
510 *type_change_ok
= true;
513 /* Handle the special case of an old common symbol merging with a
514 new symbol which looks like a common symbol in a shared object.
515 We change *PSEC and *PVALUE to make the new symbol look like a
516 common symbol, and let _bfd_generic_link_add_one_symbol will do
520 && h
->root
.type
== bfd_link_hash_common
)
524 newdyncommon
= false;
525 *pvalue
= sym
->st_size
;
526 *psec
= sec
= bfd_com_section_ptr
;
527 *size_change_ok
= true;
530 /* If the old symbol is from a dynamic object, and the new symbol is
531 a definition which is not from a dynamic object, then the new
532 symbol overrides the old symbol. Symbols from regular files
533 always take precedence over symbols from dynamic objects, even if
534 they are defined after the dynamic object in the link.
536 As above, we again permit a common symbol in a regular object to
537 override a definition in a shared object if the shared object
538 symbol is a function or is weak. */
542 || (bfd_is_com_section (sec
)
543 && (h
->root
.type
== bfd_link_hash_defweak
544 || h
->type
== STT_FUNC
)))
547 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
549 /* Change the hash table entry to undefined, and let
550 _bfd_generic_link_add_one_symbol do the right thing with the
553 h
->root
.type
= bfd_link_hash_undefined
;
554 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
555 *size_change_ok
= true;
558 olddyncommon
= false;
560 /* We again permit a type change when a common symbol may be
561 overriding a function. */
563 if (bfd_is_com_section (sec
))
564 *type_change_ok
= true;
566 /* This union may have been set to be non-NULL when this symbol
567 was seen in a dynamic object. We must force the union to be
568 NULL, so that it is correct for a regular symbol. */
570 h
->verinfo
.vertree
= NULL
;
572 /* In this special case, if H is the target of an indirection,
573 we want the caller to frob with H rather than with the
574 indirect symbol. That will permit the caller to redefine the
575 target of the indirection, rather than the indirect symbol
576 itself. FIXME: This will break the -y option if we store a
577 symbol with a different name. */
581 /* Handle the special case of a new common symbol merging with an
582 old symbol that looks like it might be a common symbol defined in
583 a shared object. Note that we have already handled the case in
584 which a new common symbol should simply override the definition
585 in the shared library. */
588 && bfd_is_com_section (sec
)
591 /* It would be best if we could set the hash table entry to a
592 common symbol, but we don't know what to use for the section
594 if (! ((*info
->callbacks
->multiple_common
)
595 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
596 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
599 /* If the predumed common symbol in the dynamic object is
600 larger, pretend that the new symbol has its size. */
602 if (h
->size
> *pvalue
)
605 /* FIXME: We no longer know the alignment required by the symbol
606 in the dynamic object, so we just wind up using the one from
607 the regular object. */
610 olddyncommon
= false;
612 h
->root
.type
= bfd_link_hash_undefined
;
613 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
615 *size_change_ok
= true;
616 *type_change_ok
= true;
618 h
->verinfo
.vertree
= NULL
;
624 /* Add symbols from an ELF object file to the linker hash table. */
627 elf_link_add_object_symbols (abfd
, info
)
629 struct bfd_link_info
*info
;
631 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
632 const Elf_Internal_Sym
*,
633 const char **, flagword
*,
634 asection
**, bfd_vma
*));
635 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
636 asection
*, const Elf_Internal_Rela
*));
638 Elf_Internal_Shdr
*hdr
;
642 Elf_External_Sym
*buf
= NULL
;
643 struct elf_link_hash_entry
**sym_hash
;
645 bfd_byte
*dynver
= NULL
;
646 Elf_External_Versym
*extversym
= NULL
;
647 Elf_External_Versym
*ever
;
648 Elf_External_Dyn
*dynbuf
= NULL
;
649 struct elf_link_hash_entry
*weaks
;
650 Elf_External_Sym
*esym
;
651 Elf_External_Sym
*esymend
;
653 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
654 collect
= get_elf_backend_data (abfd
)->collect
;
656 if ((abfd
->flags
& DYNAMIC
) == 0)
662 /* You can't use -r against a dynamic object. Also, there's no
663 hope of using a dynamic object which does not exactly match
664 the format of the output file. */
665 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
667 bfd_set_error (bfd_error_invalid_operation
);
672 /* As a GNU extension, any input sections which are named
673 .gnu.warning.SYMBOL are treated as warning symbols for the given
674 symbol. This differs from .gnu.warning sections, which generate
675 warnings when they are included in an output file. */
680 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
684 name
= bfd_get_section_name (abfd
, s
);
685 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
690 name
+= sizeof ".gnu.warning." - 1;
692 /* If this is a shared object, then look up the symbol
693 in the hash table. If it is there, and it is already
694 been defined, then we will not be using the entry
695 from this shared object, so we don't need to warn.
696 FIXME: If we see the definition in a regular object
697 later on, we will warn, but we shouldn't. The only
698 fix is to keep track of what warnings we are supposed
699 to emit, and then handle them all at the end of the
701 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
703 struct elf_link_hash_entry
*h
;
705 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
708 /* FIXME: What about bfd_link_hash_common? */
710 && (h
->root
.type
== bfd_link_hash_defined
711 || h
->root
.type
== bfd_link_hash_defweak
))
713 /* We don't want to issue this warning. Clobber
714 the section size so that the warning does not
715 get copied into the output file. */
721 sz
= bfd_section_size (abfd
, s
);
722 msg
= (char *) bfd_alloc (abfd
, sz
);
726 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
729 if (! (_bfd_generic_link_add_one_symbol
730 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
731 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
734 if (! info
->relocateable
)
736 /* Clobber the section size so that the warning does
737 not get copied into the output file. */
744 /* If this is a dynamic object, we always link against the .dynsym
745 symbol table, not the .symtab symbol table. The dynamic linker
746 will only see the .dynsym symbol table, so there is no reason to
747 look at .symtab for a dynamic object. */
749 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
750 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
752 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
756 /* Read in any version definitions. */
758 if (! _bfd_elf_slurp_version_tables (abfd
))
761 /* Read in the symbol versions, but don't bother to convert them
762 to internal format. */
763 if (elf_dynversym (abfd
) != 0)
765 Elf_Internal_Shdr
*versymhdr
;
767 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
768 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
769 if (extversym
== NULL
)
771 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
772 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
773 != versymhdr
->sh_size
))
778 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
780 /* The sh_info field of the symtab header tells us where the
781 external symbols start. We don't care about the local symbols at
783 if (elf_bad_symtab (abfd
))
785 extsymcount
= symcount
;
790 extsymcount
= symcount
- hdr
->sh_info
;
791 extsymoff
= hdr
->sh_info
;
794 buf
= ((Elf_External_Sym
*)
795 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
796 if (buf
== NULL
&& extsymcount
!= 0)
799 /* We store a pointer to the hash table entry for each external
801 sym_hash
= ((struct elf_link_hash_entry
**)
803 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
804 if (sym_hash
== NULL
)
806 elf_sym_hashes (abfd
) = sym_hash
;
810 /* If we are creating a shared library, create all the dynamic
811 sections immediately. We need to attach them to something,
812 so we attach them to this BFD, provided it is the right
813 format. FIXME: If there are no input BFD's of the same
814 format as the output, we can't make a shared library. */
816 && ! elf_hash_table (info
)->dynamic_sections_created
817 && abfd
->xvec
== info
->hash
->creator
)
819 if (! elf_link_create_dynamic_sections (abfd
, info
))
828 bfd_size_type oldsize
;
829 bfd_size_type strindex
;
831 /* Find the name to use in a DT_NEEDED entry that refers to this
832 object. If the object has a DT_SONAME entry, we use it.
833 Otherwise, if the generic linker stuck something in
834 elf_dt_name, we use that. Otherwise, we just use the file
835 name. If the generic linker put a null string into
836 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
837 there is a DT_SONAME entry. */
839 name
= bfd_get_filename (abfd
);
840 if (elf_dt_name (abfd
) != NULL
)
842 name
= elf_dt_name (abfd
);
846 s
= bfd_get_section_by_name (abfd
, ".dynamic");
849 Elf_External_Dyn
*extdyn
;
850 Elf_External_Dyn
*extdynend
;
854 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
858 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
859 (file_ptr
) 0, s
->_raw_size
))
862 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
865 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
868 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
869 for (; extdyn
< extdynend
; extdyn
++)
871 Elf_Internal_Dyn dyn
;
873 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
874 if (dyn
.d_tag
== DT_SONAME
)
876 name
= bfd_elf_string_from_elf_section (abfd
, link
,
881 if (dyn
.d_tag
== DT_NEEDED
)
883 struct bfd_link_needed_list
*n
, **pn
;
886 n
= ((struct bfd_link_needed_list
*)
887 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
888 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
890 if (n
== NULL
|| fnm
== NULL
)
892 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
899 for (pn
= &elf_hash_table (info
)->needed
;
911 /* We do not want to include any of the sections in a dynamic
912 object in the output file. We hack by simply clobbering the
913 list of sections in the BFD. This could be handled more
914 cleanly by, say, a new section flag; the existing
915 SEC_NEVER_LOAD flag is not the one we want, because that one
916 still implies that the section takes up space in the output
918 abfd
->sections
= NULL
;
919 abfd
->section_count
= 0;
921 /* If this is the first dynamic object found in the link, create
922 the special sections required for dynamic linking. */
923 if (! elf_hash_table (info
)->dynamic_sections_created
)
925 if (! elf_link_create_dynamic_sections (abfd
, info
))
931 /* Add a DT_NEEDED entry for this dynamic object. */
932 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
933 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
935 if (strindex
== (bfd_size_type
) -1)
938 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
941 Elf_External_Dyn
*dyncon
, *dynconend
;
943 /* The hash table size did not change, which means that
944 the dynamic object name was already entered. If we
945 have already included this dynamic object in the
946 link, just ignore it. There is no reason to include
947 a particular dynamic object more than once. */
948 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
950 BFD_ASSERT (sdyn
!= NULL
);
952 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
953 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
955 for (; dyncon
< dynconend
; dyncon
++)
957 Elf_Internal_Dyn dyn
;
959 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
961 if (dyn
.d_tag
== DT_NEEDED
962 && dyn
.d_un
.d_val
== strindex
)
966 if (extversym
!= NULL
)
973 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
977 /* Save the SONAME, if there is one, because sometimes the
978 linker emulation code will need to know it. */
980 name
= bfd_get_filename (abfd
);
981 elf_dt_name (abfd
) = name
;
985 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
987 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
988 != extsymcount
* sizeof (Elf_External_Sym
)))
993 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
994 esymend
= buf
+ extsymcount
;
997 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
999 Elf_Internal_Sym sym
;
1005 struct elf_link_hash_entry
*h
;
1007 boolean size_change_ok
, type_change_ok
;
1008 boolean new_weakdef
;
1009 unsigned int old_alignment
;
1011 elf_swap_symbol_in (abfd
, esym
, &sym
);
1013 flags
= BSF_NO_FLAGS
;
1015 value
= sym
.st_value
;
1018 bind
= ELF_ST_BIND (sym
.st_info
);
1019 if (bind
== STB_LOCAL
)
1021 /* This should be impossible, since ELF requires that all
1022 global symbols follow all local symbols, and that sh_info
1023 point to the first global symbol. Unfortunatealy, Irix 5
1027 else if (bind
== STB_GLOBAL
)
1029 if (sym
.st_shndx
!= SHN_UNDEF
1030 && sym
.st_shndx
!= SHN_COMMON
)
1035 else if (bind
== STB_WEAK
)
1039 /* Leave it up to the processor backend. */
1042 if (sym
.st_shndx
== SHN_UNDEF
)
1043 sec
= bfd_und_section_ptr
;
1044 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1046 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1048 sec
= bfd_abs_section_ptr
;
1049 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1052 else if (sym
.st_shndx
== SHN_ABS
)
1053 sec
= bfd_abs_section_ptr
;
1054 else if (sym
.st_shndx
== SHN_COMMON
)
1056 sec
= bfd_com_section_ptr
;
1057 /* What ELF calls the size we call the value. What ELF
1058 calls the value we call the alignment. */
1059 value
= sym
.st_size
;
1063 /* Leave it up to the processor backend. */
1066 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1067 if (name
== (const char *) NULL
)
1070 if (add_symbol_hook
)
1072 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1076 /* The hook function sets the name to NULL if this symbol
1077 should be skipped for some reason. */
1078 if (name
== (const char *) NULL
)
1082 /* Sanity check that all possibilities were handled. */
1083 if (sec
== (asection
*) NULL
)
1085 bfd_set_error (bfd_error_bad_value
);
1089 if (bfd_is_und_section (sec
)
1090 || bfd_is_com_section (sec
))
1095 size_change_ok
= false;
1096 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1098 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1100 Elf_Internal_Versym iver
;
1106 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1107 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1109 /* If this is a hidden symbol, or if it is not version
1110 1, we append the version name to the symbol name.
1111 However, we do not modify a non-hidden absolute
1112 symbol, because it might be the version symbol
1113 itself. FIXME: What if it isn't? */
1114 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1115 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1118 int namelen
, newlen
;
1121 if (sym
.st_shndx
!= SHN_UNDEF
)
1123 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1125 (*_bfd_error_handler
)
1126 ("%s: %s: invalid version %d (max %d)",
1127 abfd
->filename
, name
, vernum
,
1128 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1129 bfd_set_error (bfd_error_bad_value
);
1132 else if (vernum
> 1)
1134 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1140 /* We cannot simply test for the number of
1141 entries in the VERNEED section since the
1142 numbers for the needed versions do not start
1144 Elf_Internal_Verneed
*t
;
1147 for (t
= elf_tdata (abfd
)->verref
;
1151 Elf_Internal_Vernaux
*a
;
1153 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1155 if (a
->vna_other
== vernum
)
1157 verstr
= a
->vna_nodename
;
1166 (*_bfd_error_handler
)
1167 ("%s: %s: invalid needed version %d",
1168 abfd
->filename
, name
, vernum
);
1169 bfd_set_error (bfd_error_bad_value
);
1174 namelen
= strlen (name
);
1175 newlen
= namelen
+ strlen (verstr
) + 2;
1176 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1179 newname
= (char *) bfd_alloc (abfd
, newlen
);
1180 if (newname
== NULL
)
1182 strcpy (newname
, name
);
1183 p
= newname
+ namelen
;
1185 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1193 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1194 sym_hash
, &override
, &type_change_ok
,
1202 while (h
->root
.type
== bfd_link_hash_indirect
1203 || h
->root
.type
== bfd_link_hash_warning
)
1204 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1206 /* Remember the old alignment if this is a common symbol, so
1207 that we don't reduce the alignment later on. We can't
1208 check later, because _bfd_generic_link_add_one_symbol
1209 will set a default for the alignment which we want to
1211 if (h
->root
.type
== bfd_link_hash_common
)
1212 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1214 if (elf_tdata (abfd
)->verdef
!= NULL
1218 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1221 if (! (_bfd_generic_link_add_one_symbol
1222 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1223 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1227 while (h
->root
.type
== bfd_link_hash_indirect
1228 || h
->root
.type
== bfd_link_hash_warning
)
1229 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1232 new_weakdef
= false;
1235 && (flags
& BSF_WEAK
) != 0
1236 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1237 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1238 && h
->weakdef
== NULL
)
1240 /* Keep a list of all weak defined non function symbols from
1241 a dynamic object, using the weakdef field. Later in this
1242 function we will set the weakdef field to the correct
1243 value. We only put non-function symbols from dynamic
1244 objects on this list, because that happens to be the only
1245 time we need to know the normal symbol corresponding to a
1246 weak symbol, and the information is time consuming to
1247 figure out. If the weakdef field is not already NULL,
1248 then this symbol was already defined by some previous
1249 dynamic object, and we will be using that previous
1250 definition anyhow. */
1257 /* Set the alignment of a common symbol. */
1258 if (sym
.st_shndx
== SHN_COMMON
1259 && h
->root
.type
== bfd_link_hash_common
)
1263 align
= bfd_log2 (sym
.st_value
);
1264 if (align
> old_alignment
)
1265 h
->root
.u
.c
.p
->alignment_power
= align
;
1268 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1274 /* Remember the symbol size and type. */
1275 if (sym
.st_size
!= 0
1276 && (definition
|| h
->size
== 0))
1278 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1279 (*_bfd_error_handler
)
1280 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1281 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1282 bfd_get_filename (abfd
));
1284 h
->size
= sym
.st_size
;
1287 /* If this is a common symbol, then we always want H->SIZE
1288 to be the size of the common symbol. The code just above
1289 won't fix the size if a common symbol becomes larger. We
1290 don't warn about a size change here, because that is
1291 covered by --warn-common. */
1292 if (h
->root
.type
== bfd_link_hash_common
)
1293 h
->size
= h
->root
.u
.c
.size
;
1295 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1296 && (definition
|| h
->type
== STT_NOTYPE
))
1298 if (h
->type
!= STT_NOTYPE
1299 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1300 && ! type_change_ok
)
1301 (*_bfd_error_handler
)
1302 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1303 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1304 bfd_get_filename (abfd
));
1306 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1309 if (sym
.st_other
!= 0
1310 && (definition
|| h
->other
== 0))
1311 h
->other
= sym
.st_other
;
1313 /* Set a flag in the hash table entry indicating the type of
1314 reference or definition we just found. Keep a count of
1315 the number of dynamic symbols we find. A dynamic symbol
1316 is one which is referenced or defined by both a regular
1317 object and a shared object. */
1318 old_flags
= h
->elf_link_hash_flags
;
1323 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1325 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1327 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1328 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1334 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1336 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1337 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1338 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1339 || (h
->weakdef
!= NULL
1341 && h
->weakdef
->dynindx
!= -1))
1345 h
->elf_link_hash_flags
|= new_flag
;
1347 /* If this symbol has a version, and it is the default
1348 version, we create an indirect symbol from the default
1349 name to the fully decorated name. This will cause
1350 external references which do not specify a version to be
1351 bound to this version of the symbol. */
1356 p
= strchr (name
, ELF_VER_CHR
);
1357 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1360 struct elf_link_hash_entry
*hi
;
1363 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1365 if (shortname
== NULL
)
1367 strncpy (shortname
, name
, p
- name
);
1368 shortname
[p
- name
] = '\0';
1370 /* We are going to create a new symbol. Merge it
1371 with any existing symbol with this name. For the
1372 purposes of the merge, act as though we were
1373 defining the symbol we just defined, although we
1374 actually going to define an indirect symbol. */
1375 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1376 &value
, &hi
, &override
,
1377 &type_change_ok
, &size_change_ok
))
1382 if (! (_bfd_generic_link_add_one_symbol
1383 (info
, abfd
, shortname
, BSF_INDIRECT
,
1384 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1385 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1390 /* In this case the symbol named SHORTNAME is
1391 overriding the indirect symbol we want to
1392 add. We were planning on making SHORTNAME an
1393 indirect symbol referring to NAME. SHORTNAME
1394 is the name without a version. NAME is the
1395 fully versioned name, and it is the default
1398 Overriding means that we already saw a
1399 definition for the symbol SHORTNAME in a
1400 regular object, and it is overriding the
1401 symbol defined in the dynamic object.
1403 When this happens, we actually want to change
1404 NAME, the symbol we just added, to refer to
1405 SHORTNAME. This will cause references to
1406 NAME in the shared object to become
1407 references to SHORTNAME in the regular
1408 object. This is what we expect when we
1409 override a function in a shared object: that
1410 the references in the shared object will be
1411 mapped to the definition in the regular
1414 while (hi
->root
.type
== bfd_link_hash_indirect
1415 || hi
->root
.type
== bfd_link_hash_warning
)
1416 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1418 h
->root
.type
= bfd_link_hash_indirect
;
1419 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1420 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1422 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1423 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1424 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1428 /* Now set HI to H, so that the following code
1429 will set the other fields correctly. */
1433 /* If there is a duplicate definition somewhere,
1434 then HI may not point to an indirect symbol. We
1435 will have reported an error to the user in that
1438 if (hi
->root
.type
== bfd_link_hash_indirect
)
1440 struct elf_link_hash_entry
*ht
;
1442 /* If the symbol became indirect, then we assume
1443 that we have not seen a definition before. */
1444 BFD_ASSERT ((hi
->elf_link_hash_flags
1445 & (ELF_LINK_HASH_DEF_DYNAMIC
1446 | ELF_LINK_HASH_DEF_REGULAR
))
1449 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1451 /* Copy down any references that we may have
1452 already seen to the symbol which just became
1454 ht
->elf_link_hash_flags
|=
1455 (hi
->elf_link_hash_flags
1456 & (ELF_LINK_HASH_REF_DYNAMIC
1457 | ELF_LINK_HASH_REF_REGULAR
));
1459 /* Copy over the global table offset entry.
1460 This may have been already set up by a
1461 check_relocs routine. */
1462 if (ht
->got_offset
== (bfd_vma
) -1)
1464 ht
->got_offset
= hi
->got_offset
;
1465 hi
->got_offset
= (bfd_vma
) -1;
1467 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1469 if (ht
->dynindx
== -1)
1471 ht
->dynindx
= hi
->dynindx
;
1472 ht
->dynstr_index
= hi
->dynstr_index
;
1474 hi
->dynstr_index
= 0;
1476 BFD_ASSERT (hi
->dynindx
== -1);
1478 /* FIXME: There may be other information to copy
1479 over for particular targets. */
1481 /* See if the new flags lead us to realize that
1482 the symbol must be dynamic. */
1488 || ((hi
->elf_link_hash_flags
1489 & ELF_LINK_HASH_REF_DYNAMIC
)
1495 if ((hi
->elf_link_hash_flags
1496 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1502 /* We also need to define an indirection from the
1503 nondefault version of the symbol. */
1505 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1507 if (shortname
== NULL
)
1509 strncpy (shortname
, name
, p
- name
);
1510 strcpy (shortname
+ (p
- name
), p
+ 1);
1512 /* Once again, merge with any existing symbol. */
1513 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1514 &value
, &hi
, &override
,
1515 &type_change_ok
, &size_change_ok
))
1520 /* Here SHORTNAME is a versioned name, so we
1521 don't expect to see the type of override we
1522 do in the case above. */
1523 (*_bfd_error_handler
)
1524 ("%s: warning: unexpected redefinition of `%s'",
1525 bfd_get_filename (abfd
), shortname
);
1529 if (! (_bfd_generic_link_add_one_symbol
1530 (info
, abfd
, shortname
, BSF_INDIRECT
,
1531 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1532 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1535 /* If there is a duplicate definition somewhere,
1536 then HI may not point to an indirect symbol.
1537 We will have reported an error to the user in
1540 if (hi
->root
.type
== bfd_link_hash_indirect
)
1542 /* If the symbol became indirect, then we
1543 assume that we have not seen a definition
1545 BFD_ASSERT ((hi
->elf_link_hash_flags
1546 & (ELF_LINK_HASH_DEF_DYNAMIC
1547 | ELF_LINK_HASH_DEF_REGULAR
))
1550 /* Copy down any references that we may have
1551 already seen to the symbol which just
1553 h
->elf_link_hash_flags
|=
1554 (hi
->elf_link_hash_flags
1555 & (ELF_LINK_HASH_REF_DYNAMIC
1556 | ELF_LINK_HASH_REF_REGULAR
));
1558 /* Copy over the global table offset entry.
1559 This may have been already set up by a
1560 check_relocs routine. */
1561 if (h
->got_offset
== (bfd_vma
) -1)
1563 h
->got_offset
= hi
->got_offset
;
1564 hi
->got_offset
= (bfd_vma
) -1;
1566 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1568 if (h
->dynindx
== -1)
1570 h
->dynindx
= hi
->dynindx
;
1571 h
->dynstr_index
= hi
->dynstr_index
;
1573 hi
->dynstr_index
= 0;
1575 BFD_ASSERT (hi
->dynindx
== -1);
1577 /* FIXME: There may be other information to
1578 copy over for particular targets. */
1580 /* See if the new flags lead us to realize
1581 that the symbol must be dynamic. */
1587 || ((hi
->elf_link_hash_flags
1588 & ELF_LINK_HASH_REF_DYNAMIC
)
1594 if ((hi
->elf_link_hash_flags
1595 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1604 if (dynsym
&& h
->dynindx
== -1)
1606 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1608 if (h
->weakdef
!= NULL
1610 && h
->weakdef
->dynindx
== -1)
1612 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1620 /* Now set the weakdefs field correctly for all the weak defined
1621 symbols we found. The only way to do this is to search all the
1622 symbols. Since we only need the information for non functions in
1623 dynamic objects, that's the only time we actually put anything on
1624 the list WEAKS. We need this information so that if a regular
1625 object refers to a symbol defined weakly in a dynamic object, the
1626 real symbol in the dynamic object is also put in the dynamic
1627 symbols; we also must arrange for both symbols to point to the
1628 same memory location. We could handle the general case of symbol
1629 aliasing, but a general symbol alias can only be generated in
1630 assembler code, handling it correctly would be very time
1631 consuming, and other ELF linkers don't handle general aliasing
1633 while (weaks
!= NULL
)
1635 struct elf_link_hash_entry
*hlook
;
1638 struct elf_link_hash_entry
**hpp
;
1639 struct elf_link_hash_entry
**hppend
;
1642 weaks
= hlook
->weakdef
;
1643 hlook
->weakdef
= NULL
;
1645 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1646 || hlook
->root
.type
== bfd_link_hash_defweak
1647 || hlook
->root
.type
== bfd_link_hash_common
1648 || hlook
->root
.type
== bfd_link_hash_indirect
);
1649 slook
= hlook
->root
.u
.def
.section
;
1650 vlook
= hlook
->root
.u
.def
.value
;
1652 hpp
= elf_sym_hashes (abfd
);
1653 hppend
= hpp
+ extsymcount
;
1654 for (; hpp
< hppend
; hpp
++)
1656 struct elf_link_hash_entry
*h
;
1659 if (h
!= NULL
&& h
!= hlook
1660 && h
->root
.type
== bfd_link_hash_defined
1661 && h
->root
.u
.def
.section
== slook
1662 && h
->root
.u
.def
.value
== vlook
)
1666 /* If the weak definition is in the list of dynamic
1667 symbols, make sure the real definition is put there
1669 if (hlook
->dynindx
!= -1
1670 && h
->dynindx
== -1)
1672 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1676 /* If the real definition is in the list of dynamic
1677 symbols, make sure the weak definition is put there
1678 as well. If we don't do this, then the dynamic
1679 loader might not merge the entries for the real
1680 definition and the weak definition. */
1681 if (h
->dynindx
!= -1
1682 && hlook
->dynindx
== -1)
1684 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1699 if (extversym
!= NULL
)
1705 /* If this object is the same format as the output object, and it is
1706 not a shared library, then let the backend look through the
1709 This is required to build global offset table entries and to
1710 arrange for dynamic relocs. It is not required for the
1711 particular common case of linking non PIC code, even when linking
1712 against shared libraries, but unfortunately there is no way of
1713 knowing whether an object file has been compiled PIC or not.
1714 Looking through the relocs is not particularly time consuming.
1715 The problem is that we must either (1) keep the relocs in memory,
1716 which causes the linker to require additional runtime memory or
1717 (2) read the relocs twice from the input file, which wastes time.
1718 This would be a good case for using mmap.
1720 I have no idea how to handle linking PIC code into a file of a
1721 different format. It probably can't be done. */
1722 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1724 && abfd
->xvec
== info
->hash
->creator
1725 && check_relocs
!= NULL
)
1729 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1731 Elf_Internal_Rela
*internal_relocs
;
1734 if ((o
->flags
& SEC_RELOC
) == 0
1735 || o
->reloc_count
== 0
1736 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1737 && (o
->flags
& SEC_DEBUGGING
) != 0)
1738 || bfd_is_abs_section (o
->output_section
))
1741 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1742 (abfd
, o
, (PTR
) NULL
,
1743 (Elf_Internal_Rela
*) NULL
,
1744 info
->keep_memory
));
1745 if (internal_relocs
== NULL
)
1748 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1750 if (! info
->keep_memory
)
1751 free (internal_relocs
);
1758 /* If this is a non-traditional, non-relocateable link, try to
1759 optimize the handling of the .stab/.stabstr sections. */
1761 && ! info
->relocateable
1762 && ! info
->traditional_format
1763 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1764 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1766 asection
*stab
, *stabstr
;
1768 stab
= bfd_get_section_by_name (abfd
, ".stab");
1771 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1773 if (stabstr
!= NULL
)
1775 struct bfd_elf_section_data
*secdata
;
1777 secdata
= elf_section_data (stab
);
1778 if (! _bfd_link_section_stabs (abfd
,
1779 &elf_hash_table (info
)->stab_info
,
1781 &secdata
->stab_info
))
1796 if (extversym
!= NULL
)
1801 /* Create some sections which will be filled in with dynamic linking
1802 information. ABFD is an input file which requires dynamic sections
1803 to be created. The dynamic sections take up virtual memory space
1804 when the final executable is run, so we need to create them before
1805 addresses are assigned to the output sections. We work out the
1806 actual contents and size of these sections later. */
1809 elf_link_create_dynamic_sections (abfd
, info
)
1811 struct bfd_link_info
*info
;
1814 register asection
*s
;
1815 struct elf_link_hash_entry
*h
;
1816 struct elf_backend_data
*bed
;
1818 if (elf_hash_table (info
)->dynamic_sections_created
)
1821 /* Make sure that all dynamic sections use the same input BFD. */
1822 if (elf_hash_table (info
)->dynobj
== NULL
)
1823 elf_hash_table (info
)->dynobj
= abfd
;
1825 abfd
= elf_hash_table (info
)->dynobj
;
1827 /* Note that we set the SEC_IN_MEMORY flag for all of these
1829 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1830 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1832 /* A dynamically linked executable has a .interp section, but a
1833 shared library does not. */
1836 s
= bfd_make_section (abfd
, ".interp");
1838 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1842 /* Create sections to hold version informations. These are removed
1843 if they are not needed. */
1844 s
= bfd_make_section (abfd
, ".gnu.version_d");
1846 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1847 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1850 s
= bfd_make_section (abfd
, ".gnu.version");
1852 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1853 || ! bfd_set_section_alignment (abfd
, s
, 1))
1856 s
= bfd_make_section (abfd
, ".gnu.version_r");
1858 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1859 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1862 s
= bfd_make_section (abfd
, ".dynsym");
1864 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1865 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1868 s
= bfd_make_section (abfd
, ".dynstr");
1870 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1873 /* Create a strtab to hold the dynamic symbol names. */
1874 if (elf_hash_table (info
)->dynstr
== NULL
)
1876 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1877 if (elf_hash_table (info
)->dynstr
== NULL
)
1881 s
= bfd_make_section (abfd
, ".dynamic");
1883 || ! bfd_set_section_flags (abfd
, s
, flags
)
1884 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1887 /* The special symbol _DYNAMIC is always set to the start of the
1888 .dynamic section. This call occurs before we have processed the
1889 symbols for any dynamic object, so we don't have to worry about
1890 overriding a dynamic definition. We could set _DYNAMIC in a
1891 linker script, but we only want to define it if we are, in fact,
1892 creating a .dynamic section. We don't want to define it if there
1893 is no .dynamic section, since on some ELF platforms the start up
1894 code examines it to decide how to initialize the process. */
1896 if (! (_bfd_generic_link_add_one_symbol
1897 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1898 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1899 (struct bfd_link_hash_entry
**) &h
)))
1901 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1902 h
->type
= STT_OBJECT
;
1905 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1908 s
= bfd_make_section (abfd
, ".hash");
1910 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1911 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1914 /* Let the backend create the rest of the sections. This lets the
1915 backend set the right flags. The backend will normally create
1916 the .got and .plt sections. */
1917 bed
= get_elf_backend_data (abfd
);
1918 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1921 elf_hash_table (info
)->dynamic_sections_created
= true;
1926 /* Add an entry to the .dynamic table. */
1929 elf_add_dynamic_entry (info
, tag
, val
)
1930 struct bfd_link_info
*info
;
1934 Elf_Internal_Dyn dyn
;
1938 bfd_byte
*newcontents
;
1940 dynobj
= elf_hash_table (info
)->dynobj
;
1942 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1943 BFD_ASSERT (s
!= NULL
);
1945 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1946 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1947 if (newcontents
== NULL
)
1951 dyn
.d_un
.d_val
= val
;
1952 elf_swap_dyn_out (dynobj
, &dyn
,
1953 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1955 s
->_raw_size
= newsize
;
1956 s
->contents
= newcontents
;
1962 /* Read and swap the relocs for a section. They may have been cached.
1963 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1964 they are used as buffers to read into. They are known to be large
1965 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1966 value is allocated using either malloc or bfd_alloc, according to
1967 the KEEP_MEMORY argument. */
1970 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1974 PTR external_relocs
;
1975 Elf_Internal_Rela
*internal_relocs
;
1976 boolean keep_memory
;
1978 Elf_Internal_Shdr
*rel_hdr
;
1980 Elf_Internal_Rela
*alloc2
= NULL
;
1982 if (elf_section_data (o
)->relocs
!= NULL
)
1983 return elf_section_data (o
)->relocs
;
1985 if (o
->reloc_count
== 0)
1988 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1990 if (internal_relocs
== NULL
)
1994 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1996 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1998 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1999 if (internal_relocs
== NULL
)
2003 if (external_relocs
== NULL
)
2005 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2008 external_relocs
= alloc1
;
2011 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2012 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2013 != rel_hdr
->sh_size
))
2016 /* Swap in the relocs. For convenience, we always produce an
2017 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2019 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2021 Elf_External_Rel
*erel
;
2022 Elf_External_Rel
*erelend
;
2023 Elf_Internal_Rela
*irela
;
2025 erel
= (Elf_External_Rel
*) external_relocs
;
2026 erelend
= erel
+ o
->reloc_count
;
2027 irela
= internal_relocs
;
2028 for (; erel
< erelend
; erel
++, irela
++)
2030 Elf_Internal_Rel irel
;
2032 elf_swap_reloc_in (abfd
, erel
, &irel
);
2033 irela
->r_offset
= irel
.r_offset
;
2034 irela
->r_info
= irel
.r_info
;
2035 irela
->r_addend
= 0;
2040 Elf_External_Rela
*erela
;
2041 Elf_External_Rela
*erelaend
;
2042 Elf_Internal_Rela
*irela
;
2044 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2046 erela
= (Elf_External_Rela
*) external_relocs
;
2047 erelaend
= erela
+ o
->reloc_count
;
2048 irela
= internal_relocs
;
2049 for (; erela
< erelaend
; erela
++, irela
++)
2050 elf_swap_reloca_in (abfd
, erela
, irela
);
2053 /* Cache the results for next time, if we can. */
2055 elf_section_data (o
)->relocs
= internal_relocs
;
2060 /* Don't free alloc2, since if it was allocated we are passing it
2061 back (under the name of internal_relocs). */
2063 return internal_relocs
;
2074 /* Record an assignment to a symbol made by a linker script. We need
2075 this in case some dynamic object refers to this symbol. */
2079 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2081 struct bfd_link_info
*info
;
2085 struct elf_link_hash_entry
*h
;
2087 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2090 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2094 if (h
->root
.type
== bfd_link_hash_new
)
2095 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2097 /* If this symbol is being provided by the linker script, and it is
2098 currently defined by a dynamic object, but not by a regular
2099 object, then mark it as undefined so that the generic linker will
2100 force the correct value. */
2102 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2103 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2104 h
->root
.type
= bfd_link_hash_undefined
;
2106 /* If this symbol is not being provided by the linker script, and it is
2107 currently defined by a dynamic object, but not by a regular object,
2108 then clear out any version information because the symbol will not be
2109 associated with the dynamic object any more. */
2111 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2112 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2113 h
->verinfo
.verdef
= NULL
;
2115 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2116 h
->type
= STT_OBJECT
;
2118 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2119 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2121 && h
->dynindx
== -1)
2123 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2126 /* If this is a weak defined symbol, and we know a corresponding
2127 real symbol from the same dynamic object, make sure the real
2128 symbol is also made into a dynamic symbol. */
2129 if (h
->weakdef
!= NULL
2130 && h
->weakdef
->dynindx
== -1)
2132 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2140 /* This structure is used to pass information to
2141 elf_link_assign_sym_version. */
2143 struct elf_assign_sym_version_info
2147 /* General link information. */
2148 struct bfd_link_info
*info
;
2150 struct bfd_elf_version_tree
*verdefs
;
2151 /* Whether we are exporting all dynamic symbols. */
2152 boolean export_dynamic
;
2153 /* Whether we removed any symbols from the dynamic symbol table. */
2154 boolean removed_dynamic
;
2155 /* Whether we had a failure. */
2159 /* This structure is used to pass information to
2160 elf_link_find_version_dependencies. */
2162 struct elf_find_verdep_info
2166 /* General link information. */
2167 struct bfd_link_info
*info
;
2168 /* The number of dependencies. */
2170 /* Whether we had a failure. */
2174 /* Array used to determine the number of hash table buckets to use
2175 based on the number of symbols there are. If there are fewer than
2176 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2177 fewer than 37 we use 17 buckets, and so forth. We never use more
2178 than 32771 buckets. */
2180 static const size_t elf_buckets
[] =
2182 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2186 /* Set up the sizes and contents of the ELF dynamic sections. This is
2187 called by the ELF linker emulation before_allocation routine. We
2188 must set the sizes of the sections before the linker sets the
2189 addresses of the various sections. */
2192 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2193 export_dynamic
, filter_shlib
,
2194 auxiliary_filters
, info
, sinterpptr
,
2199 boolean export_dynamic
;
2200 const char *filter_shlib
;
2201 const char * const *auxiliary_filters
;
2202 struct bfd_link_info
*info
;
2203 asection
**sinterpptr
;
2204 struct bfd_elf_version_tree
*verdefs
;
2206 bfd_size_type soname_indx
;
2208 struct elf_backend_data
*bed
;
2209 bfd_size_type old_dynsymcount
;
2210 struct elf_assign_sym_version_info asvinfo
;
2216 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2219 /* The backend may have to create some sections regardless of whether
2220 we're dynamic or not. */
2221 bed
= get_elf_backend_data (output_bfd
);
2222 if (bed
->elf_backend_always_size_sections
2223 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2226 dynobj
= elf_hash_table (info
)->dynobj
;
2228 /* If there were no dynamic objects in the link, there is nothing to
2233 /* If we are supposed to export all symbols into the dynamic symbol
2234 table (this is not the normal case), then do so. */
2237 struct elf_info_failed eif
;
2241 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2247 if (elf_hash_table (info
)->dynamic_sections_created
)
2249 struct elf_info_failed eif
;
2250 struct elf_link_hash_entry
*h
;
2251 bfd_size_type strsize
;
2253 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2254 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2258 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2259 soname
, true, true);
2260 if (soname_indx
== (bfd_size_type
) -1
2261 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2267 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2275 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2277 if (indx
== (bfd_size_type
) -1
2278 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2282 if (filter_shlib
!= NULL
)
2286 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2287 filter_shlib
, true, true);
2288 if (indx
== (bfd_size_type
) -1
2289 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2293 if (auxiliary_filters
!= NULL
)
2295 const char * const *p
;
2297 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2301 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2303 if (indx
== (bfd_size_type
) -1
2304 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2309 /* Attach all the symbols to their version information. */
2310 asvinfo
.output_bfd
= output_bfd
;
2311 asvinfo
.info
= info
;
2312 asvinfo
.verdefs
= verdefs
;
2313 asvinfo
.export_dynamic
= export_dynamic
;
2314 asvinfo
.removed_dynamic
= false;
2315 asvinfo
.failed
= false;
2317 elf_link_hash_traverse (elf_hash_table (info
),
2318 elf_link_assign_sym_version
,
2323 /* Find all symbols which were defined in a dynamic object and make
2324 the backend pick a reasonable value for them. */
2327 elf_link_hash_traverse (elf_hash_table (info
),
2328 elf_adjust_dynamic_symbol
,
2333 /* Add some entries to the .dynamic section. We fill in some of the
2334 values later, in elf_bfd_final_link, but we must add the entries
2335 now so that we know the final size of the .dynamic section. */
2336 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2339 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2340 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2342 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2345 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2348 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2349 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2351 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2354 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2355 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2356 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2357 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2358 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2359 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2360 sizeof (Elf_External_Sym
)))
2364 /* The backend must work out the sizes of all the other dynamic
2366 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2367 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2370 if (elf_hash_table (info
)->dynamic_sections_created
)
2375 size_t bucketcount
= 0;
2376 Elf_Internal_Sym isym
;
2378 /* Set up the version definition section. */
2379 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2380 BFD_ASSERT (s
!= NULL
);
2382 /* We may have created additional version definitions if we are
2383 just linking a regular application. */
2384 verdefs
= asvinfo
.verdefs
;
2386 if (verdefs
== NULL
)
2390 /* Don't include this section in the output file. */
2391 for (spp
= &output_bfd
->sections
;
2392 *spp
!= s
->output_section
;
2393 spp
= &(*spp
)->next
)
2395 *spp
= s
->output_section
->next
;
2396 --output_bfd
->section_count
;
2402 struct bfd_elf_version_tree
*t
;
2404 Elf_Internal_Verdef def
;
2405 Elf_Internal_Verdaux defaux
;
2407 if (asvinfo
.removed_dynamic
)
2409 /* Some dynamic symbols were changed to be local
2410 symbols. In this case, we renumber all of the
2411 dynamic symbols, so that we don't have a hole. If
2412 the backend changed dynsymcount, then assume that the
2413 new symbols are at the start. This is the case on
2414 the MIPS. FIXME: The names of the removed symbols
2415 will still be in the dynamic string table, wasting
2417 elf_hash_table (info
)->dynsymcount
=
2418 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2419 elf_link_hash_traverse (elf_hash_table (info
),
2420 elf_link_renumber_dynsyms
,
2427 /* Make space for the base version. */
2428 size
+= sizeof (Elf_External_Verdef
);
2429 size
+= sizeof (Elf_External_Verdaux
);
2432 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2434 struct bfd_elf_version_deps
*n
;
2436 size
+= sizeof (Elf_External_Verdef
);
2437 size
+= sizeof (Elf_External_Verdaux
);
2440 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2441 size
+= sizeof (Elf_External_Verdaux
);
2444 s
->_raw_size
= size
;
2445 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2446 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2449 /* Fill in the version definition section. */
2453 def
.vd_version
= VER_DEF_CURRENT
;
2454 def
.vd_flags
= VER_FLG_BASE
;
2457 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2458 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2459 + sizeof (Elf_External_Verdaux
));
2461 if (soname_indx
!= -1)
2463 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2464 defaux
.vda_name
= soname_indx
;
2471 name
= output_bfd
->filename
;
2472 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2473 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2475 if (indx
== (bfd_size_type
) -1)
2477 defaux
.vda_name
= indx
;
2479 defaux
.vda_next
= 0;
2481 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2482 (Elf_External_Verdef
*)p
);
2483 p
+= sizeof (Elf_External_Verdef
);
2484 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2485 (Elf_External_Verdaux
*) p
);
2486 p
+= sizeof (Elf_External_Verdaux
);
2488 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2491 struct bfd_elf_version_deps
*n
;
2492 struct elf_link_hash_entry
*h
;
2495 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2498 /* Add a symbol representing this version. */
2500 if (! (_bfd_generic_link_add_one_symbol
2501 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2502 (bfd_vma
) 0, (const char *) NULL
, false,
2503 get_elf_backend_data (dynobj
)->collect
,
2504 (struct bfd_link_hash_entry
**) &h
)))
2506 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2507 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2508 h
->type
= STT_OBJECT
;
2509 h
->verinfo
.vertree
= t
;
2511 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2514 def
.vd_version
= VER_DEF_CURRENT
;
2516 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2517 def
.vd_flags
|= VER_FLG_WEAK
;
2518 def
.vd_ndx
= t
->vernum
+ 1;
2519 def
.vd_cnt
= cdeps
+ 1;
2520 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2521 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2522 if (t
->next
!= NULL
)
2523 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2524 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2528 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2529 (Elf_External_Verdef
*) p
);
2530 p
+= sizeof (Elf_External_Verdef
);
2532 defaux
.vda_name
= h
->dynstr_index
;
2533 if (t
->deps
== NULL
)
2534 defaux
.vda_next
= 0;
2536 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2537 t
->name_indx
= defaux
.vda_name
;
2539 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2540 (Elf_External_Verdaux
*) p
);
2541 p
+= sizeof (Elf_External_Verdaux
);
2543 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2545 defaux
.vda_name
= n
->version_needed
->name_indx
;
2546 if (n
->next
== NULL
)
2547 defaux
.vda_next
= 0;
2549 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2551 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2552 (Elf_External_Verdaux
*) p
);
2553 p
+= sizeof (Elf_External_Verdaux
);
2557 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2558 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2561 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2564 /* Work out the size of the version reference section. */
2566 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2567 BFD_ASSERT (s
!= NULL
);
2569 struct elf_find_verdep_info sinfo
;
2571 sinfo
.output_bfd
= output_bfd
;
2573 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2574 if (sinfo
.vers
== 0)
2576 sinfo
.failed
= false;
2578 elf_link_hash_traverse (elf_hash_table (info
),
2579 elf_link_find_version_dependencies
,
2582 if (elf_tdata (output_bfd
)->verref
== NULL
)
2586 /* We don't have any version definitions, so we can just
2587 remove the section. */
2589 for (spp
= &output_bfd
->sections
;
2590 *spp
!= s
->output_section
;
2591 spp
= &(*spp
)->next
)
2593 *spp
= s
->output_section
->next
;
2594 --output_bfd
->section_count
;
2598 Elf_Internal_Verneed
*t
;
2603 /* Build the version definition section. */
2606 for (t
= elf_tdata (output_bfd
)->verref
;
2610 Elf_Internal_Vernaux
*a
;
2612 size
+= sizeof (Elf_External_Verneed
);
2614 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2615 size
+= sizeof (Elf_External_Vernaux
);
2618 s
->_raw_size
= size
;
2619 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2620 if (s
->contents
== NULL
)
2624 for (t
= elf_tdata (output_bfd
)->verref
;
2629 Elf_Internal_Vernaux
*a
;
2633 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2636 t
->vn_version
= VER_NEED_CURRENT
;
2638 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2639 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2640 elf_dt_name (t
->vn_bfd
),
2643 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2644 t
->vn_bfd
->filename
, true, false);
2645 if (indx
== (bfd_size_type
) -1)
2648 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2649 if (t
->vn_nextref
== NULL
)
2652 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2653 + caux
* sizeof (Elf_External_Vernaux
));
2655 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2656 (Elf_External_Verneed
*) p
);
2657 p
+= sizeof (Elf_External_Verneed
);
2659 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2661 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2663 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2664 a
->vna_nodename
, true, false);
2665 if (indx
== (bfd_size_type
) -1)
2668 if (a
->vna_nextptr
== NULL
)
2671 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2673 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2674 (Elf_External_Vernaux
*) p
);
2675 p
+= sizeof (Elf_External_Vernaux
);
2679 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2680 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2683 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2687 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2689 /* Work out the size of the symbol version section. */
2690 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2691 BFD_ASSERT (s
!= NULL
);
2692 if (dynsymcount
== 0
2693 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2697 /* We don't need any symbol versions; just discard the
2699 for (spp
= &output_bfd
->sections
;
2700 *spp
!= s
->output_section
;
2701 spp
= &(*spp
)->next
)
2703 *spp
= s
->output_section
->next
;
2704 --output_bfd
->section_count
;
2708 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2709 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2710 if (s
->contents
== NULL
)
2713 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2717 /* Set the size of the .dynsym and .hash sections. We counted
2718 the number of dynamic symbols in elf_link_add_object_symbols.
2719 We will build the contents of .dynsym and .hash when we build
2720 the final symbol table, because until then we do not know the
2721 correct value to give the symbols. We built the .dynstr
2722 section as we went along in elf_link_add_object_symbols. */
2723 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2724 BFD_ASSERT (s
!= NULL
);
2725 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2726 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2727 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2730 /* The first entry in .dynsym is a dummy symbol. */
2737 elf_swap_symbol_out (output_bfd
, &isym
,
2738 (PTR
) (Elf_External_Sym
*) s
->contents
);
2740 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2742 bucketcount
= elf_buckets
[i
];
2743 if (dynsymcount
< elf_buckets
[i
+ 1])
2747 s
= bfd_get_section_by_name (dynobj
, ".hash");
2748 BFD_ASSERT (s
!= NULL
);
2749 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2750 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2751 if (s
->contents
== NULL
)
2753 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2755 put_word (output_bfd
, bucketcount
, s
->contents
);
2756 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2758 elf_hash_table (info
)->bucketcount
= bucketcount
;
2760 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2761 BFD_ASSERT (s
!= NULL
);
2762 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2764 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2771 /* Fix up the flags for a symbol. This handles various cases which
2772 can only be fixed after all the input files are seen. This is
2773 currently called by both adjust_dynamic_symbol and
2774 assign_sym_version, which is unnecessary but perhaps more robust in
2775 the face of future changes. */
2778 elf_fix_symbol_flags (h
, eif
)
2779 struct elf_link_hash_entry
*h
;
2780 struct elf_info_failed
*eif
;
2782 /* If this symbol was mentioned in a non-ELF file, try to set
2783 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2784 permit a non-ELF file to correctly refer to a symbol defined in
2785 an ELF dynamic object. */
2786 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2788 if (h
->root
.type
!= bfd_link_hash_defined
2789 && h
->root
.type
!= bfd_link_hash_defweak
)
2790 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2793 if (h
->root
.u
.def
.section
->owner
!= NULL
2794 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2795 == bfd_target_elf_flavour
))
2796 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2798 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2801 if (h
->dynindx
== -1
2802 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2803 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2805 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2813 /* If this is a final link, and the symbol was defined as a common
2814 symbol in a regular object file, and there was no definition in
2815 any dynamic object, then the linker will have allocated space for
2816 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2817 flag will not have been set. */
2818 if (h
->root
.type
== bfd_link_hash_defined
2819 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2820 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2821 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2822 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2823 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2825 /* If -Bsymbolic was used (which means to bind references to global
2826 symbols to the definition within the shared object), and this
2827 symbol was defined in a regular object, then it actually doesn't
2828 need a PLT entry. */
2829 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2830 && eif
->info
->shared
2831 && eif
->info
->symbolic
2832 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2833 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2838 /* Make the backend pick a good value for a dynamic symbol. This is
2839 called via elf_link_hash_traverse, and also calls itself
2843 elf_adjust_dynamic_symbol (h
, data
)
2844 struct elf_link_hash_entry
*h
;
2847 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2849 struct elf_backend_data
*bed
;
2851 /* Ignore indirect symbols. These are added by the versioning code. */
2852 if (h
->root
.type
== bfd_link_hash_indirect
)
2855 /* Fix the symbol flags. */
2856 if (! elf_fix_symbol_flags (h
, eif
))
2859 /* If this symbol does not require a PLT entry, and it is not
2860 defined by a dynamic object, or is not referenced by a regular
2861 object, ignore it. We do have to handle a weak defined symbol,
2862 even if no regular object refers to it, if we decided to add it
2863 to the dynamic symbol table. FIXME: Do we normally need to worry
2864 about symbols which are defined by one dynamic object and
2865 referenced by another one? */
2866 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2867 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2868 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2869 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2870 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2873 /* If we've already adjusted this symbol, don't do it again. This
2874 can happen via a recursive call. */
2875 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2878 /* Don't look at this symbol again. Note that we must set this
2879 after checking the above conditions, because we may look at a
2880 symbol once, decide not to do anything, and then get called
2881 recursively later after REF_REGULAR is set below. */
2882 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2884 /* If this is a weak definition, and we know a real definition, and
2885 the real symbol is not itself defined by a regular object file,
2886 then get a good value for the real definition. We handle the
2887 real symbol first, for the convenience of the backend routine.
2889 Note that there is a confusing case here. If the real definition
2890 is defined by a regular object file, we don't get the real symbol
2891 from the dynamic object, but we do get the weak symbol. If the
2892 processor backend uses a COPY reloc, then if some routine in the
2893 dynamic object changes the real symbol, we will not see that
2894 change in the corresponding weak symbol. This is the way other
2895 ELF linkers work as well, and seems to be a result of the shared
2898 I will clarify this issue. Most SVR4 shared libraries define the
2899 variable _timezone and define timezone as a weak synonym. The
2900 tzset call changes _timezone. If you write
2901 extern int timezone;
2903 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2904 you might expect that, since timezone is a synonym for _timezone,
2905 the same number will print both times. However, if the processor
2906 backend uses a COPY reloc, then actually timezone will be copied
2907 into your process image, and, since you define _timezone
2908 yourself, _timezone will not. Thus timezone and _timezone will
2909 wind up at different memory locations. The tzset call will set
2910 _timezone, leaving timezone unchanged. */
2912 if (h
->weakdef
!= NULL
)
2914 struct elf_link_hash_entry
*weakdef
;
2916 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2917 || h
->root
.type
== bfd_link_hash_defweak
);
2918 weakdef
= h
->weakdef
;
2919 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2920 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2921 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2922 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2924 /* This symbol is defined by a regular object file, so we
2925 will not do anything special. Clear weakdef for the
2926 convenience of the processor backend. */
2931 /* There is an implicit reference by a regular object file
2932 via the weak symbol. */
2933 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2934 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2939 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2940 bed
= get_elf_backend_data (dynobj
);
2941 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2950 /* This routine is used to export all defined symbols into the dynamic
2951 symbol table. It is called via elf_link_hash_traverse. */
2954 elf_export_symbol (h
, data
)
2955 struct elf_link_hash_entry
*h
;
2958 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2960 /* Ignore indirect symbols. These are added by the versioning code. */
2961 if (h
->root
.type
== bfd_link_hash_indirect
)
2964 if (h
->dynindx
== -1
2965 && (h
->elf_link_hash_flags
2966 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2968 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2978 /* Look through the symbols which are defined in other shared
2979 libraries and referenced here. Update the list of version
2980 dependencies. This will be put into the .gnu.version_r section.
2981 This function is called via elf_link_hash_traverse. */
2984 elf_link_find_version_dependencies (h
, data
)
2985 struct elf_link_hash_entry
*h
;
2988 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2989 Elf_Internal_Verneed
*t
;
2990 Elf_Internal_Vernaux
*a
;
2992 /* We only care about symbols defined in shared objects with version
2994 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2995 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2997 || h
->verinfo
.verdef
== NULL
)
3000 /* See if we already know about this version. */
3001 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3003 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3006 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3007 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3013 /* This is a new version. Add it to tree we are building. */
3017 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3020 rinfo
->failed
= true;
3024 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3025 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3026 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3029 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3031 /* Note that we are copying a string pointer here, and testing it
3032 above. If bfd_elf_string_from_elf_section is ever changed to
3033 discard the string data when low in memory, this will have to be
3035 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3037 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3038 a
->vna_nextptr
= t
->vn_auxptr
;
3040 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3043 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3050 /* Figure out appropriate versions for all the symbols. We may not
3051 have the version number script until we have read all of the input
3052 files, so until that point we don't know which symbols should be
3053 local. This function is called via elf_link_hash_traverse. */
3056 elf_link_assign_sym_version (h
, data
)
3057 struct elf_link_hash_entry
*h
;
3060 struct elf_assign_sym_version_info
*sinfo
=
3061 (struct elf_assign_sym_version_info
*) data
;
3062 struct bfd_link_info
*info
= sinfo
->info
;
3063 struct elf_info_failed eif
;
3066 /* Fix the symbol flags. */
3069 if (! elf_fix_symbol_flags (h
, &eif
))
3072 sinfo
->failed
= true;
3076 /* We only need version numbers for symbols defined in regular
3078 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3081 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3082 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3084 struct bfd_elf_version_tree
*t
;
3089 /* There are two consecutive ELF_VER_CHR characters if this is
3090 not a hidden symbol. */
3092 if (*p
== ELF_VER_CHR
)
3098 /* If there is no version string, we can just return out. */
3102 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3106 /* Look for the version. If we find it, it is no longer weak. */
3107 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3109 if (strcmp (t
->name
, p
) == 0)
3113 struct bfd_elf_version_expr
*d
;
3115 len
= p
- h
->root
.root
.string
;
3116 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3119 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3120 alc
[len
- 1] = '\0';
3121 if (alc
[len
- 2] == ELF_VER_CHR
)
3122 alc
[len
- 2] = '\0';
3124 h
->verinfo
.vertree
= t
;
3128 if (t
->globals
!= NULL
)
3130 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3132 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3133 || fnmatch (d
->match
, alc
, 0) == 0)
3138 /* See if there is anything to force this symbol to
3140 if (d
== NULL
&& t
->locals
!= NULL
)
3142 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3144 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3145 || fnmatch (d
->match
, alc
, 0) == 0)
3147 if (h
->dynindx
!= -1
3149 && ! sinfo
->export_dynamic
)
3151 sinfo
->removed_dynamic
= true;
3152 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3153 h
->elf_link_hash_flags
&=~
3154 ELF_LINK_HASH_NEEDS_PLT
;
3156 /* FIXME: The name of the symbol has
3157 already been recorded in the dynamic
3158 string table section. */
3166 bfd_release (sinfo
->output_bfd
, alc
);
3171 /* If we are building an application, we need to create a
3172 version node for this version. */
3173 if (t
== NULL
&& ! info
->shared
)
3175 struct bfd_elf_version_tree
**pp
;
3178 /* If we aren't going to export this symbol, we don't need
3179 to worry about it. */
3180 if (h
->dynindx
== -1)
3183 t
= ((struct bfd_elf_version_tree
*)
3184 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3187 sinfo
->failed
= true;
3196 t
->name_indx
= (unsigned int) -1;
3200 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3202 t
->vernum
= version_index
;
3206 h
->verinfo
.vertree
= t
;
3210 /* We could not find the version for a symbol when
3211 generating a shared archive. Return an error. */
3212 (*_bfd_error_handler
)
3213 ("%s: undefined version name %s",
3214 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3215 bfd_set_error (bfd_error_bad_value
);
3216 sinfo
->failed
= true;
3221 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3224 /* If we don't have a version for this symbol, see if we can find
3226 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3228 struct bfd_elf_version_tree
*t
;
3229 struct bfd_elf_version_tree
*deflt
;
3230 struct bfd_elf_version_expr
*d
;
3232 /* See if can find what version this symbol is in. If the
3233 symbol is supposed to be local, then don't actually register
3236 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3238 if (t
->globals
!= NULL
)
3240 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3242 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3244 h
->verinfo
.vertree
= t
;
3253 if (t
->locals
!= NULL
)
3255 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3257 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3259 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3261 h
->verinfo
.vertree
= t
;
3262 if (h
->dynindx
!= -1
3264 && ! sinfo
->export_dynamic
)
3266 sinfo
->removed_dynamic
= true;
3267 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3268 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3270 /* FIXME: The name of the symbol has already
3271 been recorded in the dynamic string table
3283 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3285 h
->verinfo
.vertree
= deflt
;
3286 if (h
->dynindx
!= -1
3288 && ! sinfo
->export_dynamic
)
3290 sinfo
->removed_dynamic
= true;
3291 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3292 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3294 /* FIXME: The name of the symbol has already been
3295 recorded in the dynamic string table section. */
3303 /* This function is used to renumber the dynamic symbols, if some of
3304 them are removed because they are marked as local. This is called
3305 via elf_link_hash_traverse. */
3308 elf_link_renumber_dynsyms (h
, data
)
3309 struct elf_link_hash_entry
*h
;
3312 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3314 if (h
->dynindx
!= -1)
3316 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3317 ++elf_hash_table (info
)->dynsymcount
;
3323 /* Final phase of ELF linker. */
3325 /* A structure we use to avoid passing large numbers of arguments. */
3327 struct elf_final_link_info
3329 /* General link information. */
3330 struct bfd_link_info
*info
;
3333 /* Symbol string table. */
3334 struct bfd_strtab_hash
*symstrtab
;
3335 /* .dynsym section. */
3336 asection
*dynsym_sec
;
3337 /* .hash section. */
3339 /* symbol version section (.gnu.version). */
3340 asection
*symver_sec
;
3341 /* Buffer large enough to hold contents of any section. */
3343 /* Buffer large enough to hold external relocs of any section. */
3344 PTR external_relocs
;
3345 /* Buffer large enough to hold internal relocs of any section. */
3346 Elf_Internal_Rela
*internal_relocs
;
3347 /* Buffer large enough to hold external local symbols of any input
3349 Elf_External_Sym
*external_syms
;
3350 /* Buffer large enough to hold internal local symbols of any input
3352 Elf_Internal_Sym
*internal_syms
;
3353 /* Array large enough to hold a symbol index for each local symbol
3354 of any input BFD. */
3356 /* Array large enough to hold a section pointer for each local
3357 symbol of any input BFD. */
3358 asection
**sections
;
3359 /* Buffer to hold swapped out symbols. */
3360 Elf_External_Sym
*symbuf
;
3361 /* Number of swapped out symbols in buffer. */
3362 size_t symbuf_count
;
3363 /* Number of symbols which fit in symbuf. */
3367 static boolean elf_link_output_sym
3368 PARAMS ((struct elf_final_link_info
*, const char *,
3369 Elf_Internal_Sym
*, asection
*));
3370 static boolean elf_link_flush_output_syms
3371 PARAMS ((struct elf_final_link_info
*));
3372 static boolean elf_link_output_extsym
3373 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3374 static boolean elf_link_input_bfd
3375 PARAMS ((struct elf_final_link_info
*, bfd
*));
3376 static boolean elf_reloc_link_order
3377 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3378 struct bfd_link_order
*));
3380 /* This struct is used to pass information to elf_link_output_extsym. */
3382 struct elf_outext_info
3386 struct elf_final_link_info
*finfo
;
3389 /* Do the final step of an ELF link. */
3392 elf_bfd_final_link (abfd
, info
)
3394 struct bfd_link_info
*info
;
3398 struct elf_final_link_info finfo
;
3399 register asection
*o
;
3400 register struct bfd_link_order
*p
;
3402 size_t max_contents_size
;
3403 size_t max_external_reloc_size
;
3404 size_t max_internal_reloc_count
;
3405 size_t max_sym_count
;
3407 Elf_Internal_Sym elfsym
;
3409 Elf_Internal_Shdr
*symtab_hdr
;
3410 Elf_Internal_Shdr
*symstrtab_hdr
;
3411 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3412 struct elf_outext_info eoinfo
;
3415 abfd
->flags
|= DYNAMIC
;
3417 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3418 dynobj
= elf_hash_table (info
)->dynobj
;
3421 finfo
.output_bfd
= abfd
;
3422 finfo
.symstrtab
= elf_stringtab_init ();
3423 if (finfo
.symstrtab
== NULL
)
3428 finfo
.dynsym_sec
= NULL
;
3429 finfo
.hash_sec
= NULL
;
3430 finfo
.symver_sec
= NULL
;
3434 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3435 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3436 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3437 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3438 /* Note that it is OK if symver_sec is NULL. */
3441 finfo
.contents
= NULL
;
3442 finfo
.external_relocs
= NULL
;
3443 finfo
.internal_relocs
= NULL
;
3444 finfo
.external_syms
= NULL
;
3445 finfo
.internal_syms
= NULL
;
3446 finfo
.indices
= NULL
;
3447 finfo
.sections
= NULL
;
3448 finfo
.symbuf
= NULL
;
3449 finfo
.symbuf_count
= 0;
3451 /* Count up the number of relocations we will output for each output
3452 section, so that we know the sizes of the reloc sections. We
3453 also figure out some maximum sizes. */
3454 max_contents_size
= 0;
3455 max_external_reloc_size
= 0;
3456 max_internal_reloc_count
= 0;
3458 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3462 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3464 if (p
->type
== bfd_section_reloc_link_order
3465 || p
->type
== bfd_symbol_reloc_link_order
)
3467 else if (p
->type
== bfd_indirect_link_order
)
3471 sec
= p
->u
.indirect
.section
;
3473 /* Mark all sections which are to be included in the
3474 link. This will normally be every section. We need
3475 to do this so that we can identify any sections which
3476 the linker has decided to not include. */
3477 sec
->linker_mark
= true;
3479 if (info
->relocateable
)
3480 o
->reloc_count
+= sec
->reloc_count
;
3482 if (sec
->_raw_size
> max_contents_size
)
3483 max_contents_size
= sec
->_raw_size
;
3484 if (sec
->_cooked_size
> max_contents_size
)
3485 max_contents_size
= sec
->_cooked_size
;
3487 /* We are interested in just local symbols, not all
3489 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3490 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3494 if (elf_bad_symtab (sec
->owner
))
3495 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3496 / sizeof (Elf_External_Sym
));
3498 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3500 if (sym_count
> max_sym_count
)
3501 max_sym_count
= sym_count
;
3503 if ((sec
->flags
& SEC_RELOC
) != 0)
3507 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3508 if (ext_size
> max_external_reloc_size
)
3509 max_external_reloc_size
= ext_size
;
3510 if (sec
->reloc_count
> max_internal_reloc_count
)
3511 max_internal_reloc_count
= sec
->reloc_count
;
3517 if (o
->reloc_count
> 0)
3518 o
->flags
|= SEC_RELOC
;
3521 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3522 set it (this is probably a bug) and if it is set
3523 assign_section_numbers will create a reloc section. */
3524 o
->flags
&=~ SEC_RELOC
;
3527 /* If the SEC_ALLOC flag is not set, force the section VMA to
3528 zero. This is done in elf_fake_sections as well, but forcing
3529 the VMA to 0 here will ensure that relocs against these
3530 sections are handled correctly. */
3531 if ((o
->flags
& SEC_ALLOC
) == 0
3532 && ! o
->user_set_vma
)
3536 /* Figure out the file positions for everything but the symbol table
3537 and the relocs. We set symcount to force assign_section_numbers
3538 to create a symbol table. */
3539 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3540 BFD_ASSERT (! abfd
->output_has_begun
);
3541 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3544 /* That created the reloc sections. Set their sizes, and assign
3545 them file positions, and allocate some buffers. */
3546 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3548 if ((o
->flags
& SEC_RELOC
) != 0)
3550 Elf_Internal_Shdr
*rel_hdr
;
3551 register struct elf_link_hash_entry
**p
, **pend
;
3553 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3555 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3557 /* The contents field must last into write_object_contents,
3558 so we allocate it with bfd_alloc rather than malloc. */
3559 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3560 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3563 p
= ((struct elf_link_hash_entry
**)
3564 bfd_malloc (o
->reloc_count
3565 * sizeof (struct elf_link_hash_entry
*)));
3566 if (p
== NULL
&& o
->reloc_count
!= 0)
3568 elf_section_data (o
)->rel_hashes
= p
;
3569 pend
= p
+ o
->reloc_count
;
3570 for (; p
< pend
; p
++)
3573 /* Use the reloc_count field as an index when outputting the
3579 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3581 /* We have now assigned file positions for all the sections except
3582 .symtab and .strtab. We start the .symtab section at the current
3583 file position, and write directly to it. We build the .strtab
3584 section in memory. */
3586 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3587 /* sh_name is set in prep_headers. */
3588 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3589 symtab_hdr
->sh_flags
= 0;
3590 symtab_hdr
->sh_addr
= 0;
3591 symtab_hdr
->sh_size
= 0;
3592 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3593 /* sh_link is set in assign_section_numbers. */
3594 /* sh_info is set below. */
3595 /* sh_offset is set just below. */
3596 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3598 off
= elf_tdata (abfd
)->next_file_pos
;
3599 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3601 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3602 incorrect. We do not yet know the size of the .symtab section.
3603 We correct next_file_pos below, after we do know the size. */
3605 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3606 continuously seeking to the right position in the file. */
3607 if (! info
->keep_memory
|| max_sym_count
< 20)
3608 finfo
.symbuf_size
= 20;
3610 finfo
.symbuf_size
= max_sym_count
;
3611 finfo
.symbuf
= ((Elf_External_Sym
*)
3612 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3613 if (finfo
.symbuf
== NULL
)
3616 /* Start writing out the symbol table. The first symbol is always a
3618 if (info
->strip
!= strip_all
|| info
->relocateable
)
3620 elfsym
.st_value
= 0;
3623 elfsym
.st_other
= 0;
3624 elfsym
.st_shndx
= SHN_UNDEF
;
3625 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3626 &elfsym
, bfd_und_section_ptr
))
3631 /* Some standard ELF linkers do this, but we don't because it causes
3632 bootstrap comparison failures. */
3633 /* Output a file symbol for the output file as the second symbol.
3634 We output this even if we are discarding local symbols, although
3635 I'm not sure if this is correct. */
3636 elfsym
.st_value
= 0;
3638 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3639 elfsym
.st_other
= 0;
3640 elfsym
.st_shndx
= SHN_ABS
;
3641 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3642 &elfsym
, bfd_abs_section_ptr
))
3646 /* Output a symbol for each section. We output these even if we are
3647 discarding local symbols, since they are used for relocs. These
3648 symbols have no names. We store the index of each one in the
3649 index field of the section, so that we can find it again when
3650 outputting relocs. */
3651 if (info
->strip
!= strip_all
|| info
->relocateable
)
3654 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3655 elfsym
.st_other
= 0;
3656 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3658 o
= section_from_elf_index (abfd
, i
);
3660 o
->target_index
= abfd
->symcount
;
3661 elfsym
.st_shndx
= i
;
3662 if (info
->relocateable
|| o
== NULL
)
3663 elfsym
.st_value
= 0;
3665 elfsym
.st_value
= o
->vma
;
3666 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3672 /* Allocate some memory to hold information read in from the input
3674 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3675 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3676 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3677 bfd_malloc (max_internal_reloc_count
3678 * sizeof (Elf_Internal_Rela
)));
3679 finfo
.external_syms
= ((Elf_External_Sym
*)
3680 bfd_malloc (max_sym_count
3681 * sizeof (Elf_External_Sym
)));
3682 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3683 bfd_malloc (max_sym_count
3684 * sizeof (Elf_Internal_Sym
)));
3685 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3686 finfo
.sections
= ((asection
**)
3687 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3688 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3689 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3690 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3691 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3692 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3693 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3694 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3697 /* Since ELF permits relocations to be against local symbols, we
3698 must have the local symbols available when we do the relocations.
3699 Since we would rather only read the local symbols once, and we
3700 would rather not keep them in memory, we handle all the
3701 relocations for a single input file at the same time.
3703 Unfortunately, there is no way to know the total number of local
3704 symbols until we have seen all of them, and the local symbol
3705 indices precede the global symbol indices. This means that when
3706 we are generating relocateable output, and we see a reloc against
3707 a global symbol, we can not know the symbol index until we have
3708 finished examining all the local symbols to see which ones we are
3709 going to output. To deal with this, we keep the relocations in
3710 memory, and don't output them until the end of the link. This is
3711 an unfortunate waste of memory, but I don't see a good way around
3712 it. Fortunately, it only happens when performing a relocateable
3713 link, which is not the common case. FIXME: If keep_memory is set
3714 we could write the relocs out and then read them again; I don't
3715 know how bad the memory loss will be. */
3717 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3718 sub
->output_has_begun
= false;
3719 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3721 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3723 if (p
->type
== bfd_indirect_link_order
3724 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3725 == bfd_target_elf_flavour
))
3727 sub
= p
->u
.indirect
.section
->owner
;
3728 if (! sub
->output_has_begun
)
3730 if (! elf_link_input_bfd (&finfo
, sub
))
3732 sub
->output_has_begun
= true;
3735 else if (p
->type
== bfd_section_reloc_link_order
3736 || p
->type
== bfd_symbol_reloc_link_order
)
3738 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3743 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3749 /* That wrote out all the local symbols. Finish up the symbol table
3750 with the global symbols. */
3752 if (info
->strip
!= strip_all
&& info
->shared
)
3754 /* Output any global symbols that got converted to local in a
3755 version script. We do this in a separate step since ELF
3756 requires all local symbols to appear prior to any global
3757 symbols. FIXME: We should only do this if some global
3758 symbols were, in fact, converted to become local. FIXME:
3759 Will this work correctly with the Irix 5 linker? */
3760 eoinfo
.failed
= false;
3761 eoinfo
.finfo
= &finfo
;
3762 eoinfo
.localsyms
= true;
3763 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3769 /* The sh_info field records the index of the first non local
3771 symtab_hdr
->sh_info
= abfd
->symcount
;
3773 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3775 /* We get the global symbols from the hash table. */
3776 eoinfo
.failed
= false;
3777 eoinfo
.localsyms
= false;
3778 eoinfo
.finfo
= &finfo
;
3779 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3784 /* Flush all symbols to the file. */
3785 if (! elf_link_flush_output_syms (&finfo
))
3788 /* Now we know the size of the symtab section. */
3789 off
+= symtab_hdr
->sh_size
;
3791 /* Finish up and write out the symbol string table (.strtab)
3793 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3794 /* sh_name was set in prep_headers. */
3795 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3796 symstrtab_hdr
->sh_flags
= 0;
3797 symstrtab_hdr
->sh_addr
= 0;
3798 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3799 symstrtab_hdr
->sh_entsize
= 0;
3800 symstrtab_hdr
->sh_link
= 0;
3801 symstrtab_hdr
->sh_info
= 0;
3802 /* sh_offset is set just below. */
3803 symstrtab_hdr
->sh_addralign
= 1;
3805 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3806 elf_tdata (abfd
)->next_file_pos
= off
;
3808 if (abfd
->symcount
> 0)
3810 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3811 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3815 /* Adjust the relocs to have the correct symbol indices. */
3816 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3818 struct elf_link_hash_entry
**rel_hash
;
3819 Elf_Internal_Shdr
*rel_hdr
;
3821 if ((o
->flags
& SEC_RELOC
) == 0)
3824 rel_hash
= elf_section_data (o
)->rel_hashes
;
3825 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3826 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3828 if (*rel_hash
== NULL
)
3831 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3833 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3835 Elf_External_Rel
*erel
;
3836 Elf_Internal_Rel irel
;
3838 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3839 elf_swap_reloc_in (abfd
, erel
, &irel
);
3840 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3841 ELF_R_TYPE (irel
.r_info
));
3842 elf_swap_reloc_out (abfd
, &irel
, erel
);
3846 Elf_External_Rela
*erela
;
3847 Elf_Internal_Rela irela
;
3849 BFD_ASSERT (rel_hdr
->sh_entsize
3850 == sizeof (Elf_External_Rela
));
3852 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3853 elf_swap_reloca_in (abfd
, erela
, &irela
);
3854 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3855 ELF_R_TYPE (irela
.r_info
));
3856 elf_swap_reloca_out (abfd
, &irela
, erela
);
3860 /* Set the reloc_count field to 0 to prevent write_relocs from
3861 trying to swap the relocs out itself. */
3865 /* If we are linking against a dynamic object, or generating a
3866 shared library, finish up the dynamic linking information. */
3869 Elf_External_Dyn
*dyncon
, *dynconend
;
3871 /* Fix up .dynamic entries. */
3872 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3873 BFD_ASSERT (o
!= NULL
);
3875 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3876 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3877 for (; dyncon
< dynconend
; dyncon
++)
3879 Elf_Internal_Dyn dyn
;
3883 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3890 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3891 magic _init and _fini symbols. This is pretty ugly,
3892 but we are compatible. */
3900 struct elf_link_hash_entry
*h
;
3902 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3903 false, false, true);
3905 && (h
->root
.type
== bfd_link_hash_defined
3906 || h
->root
.type
== bfd_link_hash_defweak
))
3908 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3909 o
= h
->root
.u
.def
.section
;
3910 if (o
->output_section
!= NULL
)
3911 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3912 + o
->output_offset
);
3915 /* The symbol is imported from another shared
3916 library and does not apply to this one. */
3920 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3935 name
= ".gnu.version_d";
3938 name
= ".gnu.version_r";
3941 name
= ".gnu.version";
3943 o
= bfd_get_section_by_name (abfd
, name
);
3944 BFD_ASSERT (o
!= NULL
);
3945 dyn
.d_un
.d_ptr
= o
->vma
;
3946 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3953 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3958 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3960 Elf_Internal_Shdr
*hdr
;
3962 hdr
= elf_elfsections (abfd
)[i
];
3963 if (hdr
->sh_type
== type
3964 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3966 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3967 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3970 if (dyn
.d_un
.d_val
== 0
3971 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3972 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3976 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3982 /* If we have created any dynamic sections, then output them. */
3985 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3988 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3990 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3991 || o
->_raw_size
== 0)
3993 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3995 /* At this point, we are only interested in sections
3996 created by elf_link_create_dynamic_sections. */
3999 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4001 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4003 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4004 o
->contents
, o
->output_offset
,
4012 /* The contents of the .dynstr section are actually in a
4014 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4015 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4016 || ! _bfd_stringtab_emit (abfd
,
4017 elf_hash_table (info
)->dynstr
))
4023 /* If we have optimized stabs strings, output them. */
4024 if (elf_hash_table (info
)->stab_info
!= NULL
)
4026 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4030 if (finfo
.symstrtab
!= NULL
)
4031 _bfd_stringtab_free (finfo
.symstrtab
);
4032 if (finfo
.contents
!= NULL
)
4033 free (finfo
.contents
);
4034 if (finfo
.external_relocs
!= NULL
)
4035 free (finfo
.external_relocs
);
4036 if (finfo
.internal_relocs
!= NULL
)
4037 free (finfo
.internal_relocs
);
4038 if (finfo
.external_syms
!= NULL
)
4039 free (finfo
.external_syms
);
4040 if (finfo
.internal_syms
!= NULL
)
4041 free (finfo
.internal_syms
);
4042 if (finfo
.indices
!= NULL
)
4043 free (finfo
.indices
);
4044 if (finfo
.sections
!= NULL
)
4045 free (finfo
.sections
);
4046 if (finfo
.symbuf
!= NULL
)
4047 free (finfo
.symbuf
);
4048 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4050 if ((o
->flags
& SEC_RELOC
) != 0
4051 && elf_section_data (o
)->rel_hashes
!= NULL
)
4052 free (elf_section_data (o
)->rel_hashes
);
4055 elf_tdata (abfd
)->linker
= true;
4060 if (finfo
.symstrtab
!= NULL
)
4061 _bfd_stringtab_free (finfo
.symstrtab
);
4062 if (finfo
.contents
!= NULL
)
4063 free (finfo
.contents
);
4064 if (finfo
.external_relocs
!= NULL
)
4065 free (finfo
.external_relocs
);
4066 if (finfo
.internal_relocs
!= NULL
)
4067 free (finfo
.internal_relocs
);
4068 if (finfo
.external_syms
!= NULL
)
4069 free (finfo
.external_syms
);
4070 if (finfo
.internal_syms
!= NULL
)
4071 free (finfo
.internal_syms
);
4072 if (finfo
.indices
!= NULL
)
4073 free (finfo
.indices
);
4074 if (finfo
.sections
!= NULL
)
4075 free (finfo
.sections
);
4076 if (finfo
.symbuf
!= NULL
)
4077 free (finfo
.symbuf
);
4078 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4080 if ((o
->flags
& SEC_RELOC
) != 0
4081 && elf_section_data (o
)->rel_hashes
!= NULL
)
4082 free (elf_section_data (o
)->rel_hashes
);
4088 /* Add a symbol to the output symbol table. */
4091 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4092 struct elf_final_link_info
*finfo
;
4094 Elf_Internal_Sym
*elfsym
;
4095 asection
*input_sec
;
4097 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4098 struct bfd_link_info
*info
,
4103 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4104 elf_backend_link_output_symbol_hook
;
4105 if (output_symbol_hook
!= NULL
)
4107 if (! ((*output_symbol_hook
)
4108 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4112 if (name
== (const char *) NULL
|| *name
== '\0')
4113 elfsym
->st_name
= 0;
4116 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4119 if (elfsym
->st_name
== (unsigned long) -1)
4123 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4125 if (! elf_link_flush_output_syms (finfo
))
4129 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4130 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4131 ++finfo
->symbuf_count
;
4133 ++finfo
->output_bfd
->symcount
;
4138 /* Flush the output symbols to the file. */
4141 elf_link_flush_output_syms (finfo
)
4142 struct elf_final_link_info
*finfo
;
4144 if (finfo
->symbuf_count
> 0)
4146 Elf_Internal_Shdr
*symtab
;
4148 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4150 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4152 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4153 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4154 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4157 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4159 finfo
->symbuf_count
= 0;
4165 /* Add an external symbol to the symbol table. This is called from
4166 the hash table traversal routine. When generating a shared object,
4167 we go through the symbol table twice. The first time we output
4168 anything that might have been forced to local scope in a version
4169 script. The second time we output the symbols that are still
4173 elf_link_output_extsym (h
, data
)
4174 struct elf_link_hash_entry
*h
;
4177 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4178 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4180 Elf_Internal_Sym sym
;
4181 asection
*input_sec
;
4183 /* Decide whether to output this symbol in this pass. */
4184 if (eoinfo
->localsyms
)
4186 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4191 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4195 /* If we are not creating a shared library, and this symbol is
4196 referenced by a shared library but is not defined anywhere, then
4197 warn that it is undefined. If we do not do this, the runtime
4198 linker will complain that the symbol is undefined when the
4199 program is run. We don't have to worry about symbols that are
4200 referenced by regular files, because we will already have issued
4201 warnings for them. */
4202 if (! finfo
->info
->relocateable
4203 && ! finfo
->info
->shared
4204 && h
->root
.type
== bfd_link_hash_undefined
4205 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4206 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4208 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4209 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4210 (asection
*) NULL
, 0)))
4212 eoinfo
->failed
= true;
4217 /* We don't want to output symbols that have never been mentioned by
4218 a regular file, or that we have been told to strip. However, if
4219 h->indx is set to -2, the symbol is used by a reloc and we must
4223 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4224 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4225 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4226 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4228 else if (finfo
->info
->strip
== strip_all
4229 || (finfo
->info
->strip
== strip_some
4230 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4231 h
->root
.root
.string
,
4232 false, false) == NULL
))
4237 /* If we're stripping it, and it's not a dynamic symbol, there's
4238 nothing else to do. */
4239 if (strip
&& h
->dynindx
== -1)
4243 sym
.st_size
= h
->size
;
4244 sym
.st_other
= h
->other
;
4245 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4246 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4247 else if (h
->root
.type
== bfd_link_hash_undefweak
4248 || h
->root
.type
== bfd_link_hash_defweak
)
4249 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4251 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4253 switch (h
->root
.type
)
4256 case bfd_link_hash_new
:
4260 case bfd_link_hash_undefined
:
4261 input_sec
= bfd_und_section_ptr
;
4262 sym
.st_shndx
= SHN_UNDEF
;
4265 case bfd_link_hash_undefweak
:
4266 input_sec
= bfd_und_section_ptr
;
4267 sym
.st_shndx
= SHN_UNDEF
;
4270 case bfd_link_hash_defined
:
4271 case bfd_link_hash_defweak
:
4273 input_sec
= h
->root
.u
.def
.section
;
4274 if (input_sec
->output_section
!= NULL
)
4277 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4278 input_sec
->output_section
);
4279 if (sym
.st_shndx
== (unsigned short) -1)
4281 eoinfo
->failed
= true;
4285 /* ELF symbols in relocateable files are section relative,
4286 but in nonrelocateable files they are virtual
4288 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4289 if (! finfo
->info
->relocateable
)
4290 sym
.st_value
+= input_sec
->output_section
->vma
;
4294 BFD_ASSERT (input_sec
->owner
== NULL
4295 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4296 sym
.st_shndx
= SHN_UNDEF
;
4297 input_sec
= bfd_und_section_ptr
;
4302 case bfd_link_hash_common
:
4303 input_sec
= h
->root
.u
.c
.p
->section
;
4304 sym
.st_shndx
= SHN_COMMON
;
4305 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4308 case bfd_link_hash_indirect
:
4309 /* These symbols are created by symbol versioning. They point
4310 to the decorated version of the name. For example, if the
4311 symbol foo@@GNU_1.2 is the default, which should be used when
4312 foo is used with no version, then we add an indirect symbol
4313 foo which points to foo@@GNU_1.2. We ignore these symbols,
4314 since the indirected symbol is already in the hash table. If
4315 the indirect symbol is non-ELF, fall through and output it. */
4316 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4320 case bfd_link_hash_warning
:
4321 /* We can't represent these symbols in ELF, although a warning
4322 symbol may have come from a .gnu.warning.SYMBOL section. We
4323 just put the target symbol in the hash table. If the target
4324 symbol does not really exist, don't do anything. */
4325 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4327 return (elf_link_output_extsym
4328 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4331 /* Give the processor backend a chance to tweak the symbol value,
4332 and also to finish up anything that needs to be done for this
4334 if ((h
->dynindx
!= -1
4335 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4336 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4338 struct elf_backend_data
*bed
;
4340 bed
= get_elf_backend_data (finfo
->output_bfd
);
4341 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4342 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4344 eoinfo
->failed
= true;
4349 /* If this symbol should be put in the .dynsym section, then put it
4350 there now. We have already know the symbol index. We also fill
4351 in the entry in the .hash section. */
4352 if (h
->dynindx
!= -1
4353 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4359 bfd_byte
*bucketpos
;
4362 sym
.st_name
= h
->dynstr_index
;
4364 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4365 (PTR
) (((Elf_External_Sym
*)
4366 finfo
->dynsym_sec
->contents
)
4369 /* We didn't include the version string in the dynamic string
4370 table, so we must not consider it in the hash table. */
4371 name
= h
->root
.root
.string
;
4372 p
= strchr (name
, ELF_VER_CHR
);
4377 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4378 strncpy (copy
, name
, p
- name
);
4379 copy
[p
- name
] = '\0';
4383 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4384 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4385 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4386 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4387 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4388 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4389 put_word (finfo
->output_bfd
, chain
,
4390 ((bfd_byte
*) finfo
->hash_sec
->contents
4391 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4394 bfd_release (finfo
->output_bfd
, copy
);
4396 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4398 Elf_Internal_Versym iversym
;
4400 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4402 if (h
->verinfo
.verdef
== NULL
)
4403 iversym
.vs_vers
= 0;
4405 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4409 if (h
->verinfo
.vertree
== NULL
)
4410 iversym
.vs_vers
= 1;
4412 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4415 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4416 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4418 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4419 (((Elf_External_Versym
*)
4420 finfo
->symver_sec
->contents
)
4425 /* If we're stripping it, then it was just a dynamic symbol, and
4426 there's nothing else to do. */
4430 h
->indx
= finfo
->output_bfd
->symcount
;
4432 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4434 eoinfo
->failed
= true;
4441 /* Link an input file into the linker output file. This function
4442 handles all the sections and relocations of the input file at once.
4443 This is so that we only have to read the local symbols once, and
4444 don't have to keep them in memory. */
4447 elf_link_input_bfd (finfo
, input_bfd
)
4448 struct elf_final_link_info
*finfo
;
4451 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4452 bfd
*, asection
*, bfd_byte
*,
4453 Elf_Internal_Rela
*,
4454 Elf_Internal_Sym
*, asection
**));
4456 Elf_Internal_Shdr
*symtab_hdr
;
4459 Elf_External_Sym
*external_syms
;
4460 Elf_External_Sym
*esym
;
4461 Elf_External_Sym
*esymend
;
4462 Elf_Internal_Sym
*isym
;
4464 asection
**ppsection
;
4467 output_bfd
= finfo
->output_bfd
;
4469 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4471 /* If this is a dynamic object, we don't want to do anything here:
4472 we don't want the local symbols, and we don't want the section
4474 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4477 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4478 if (elf_bad_symtab (input_bfd
))
4480 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4485 locsymcount
= symtab_hdr
->sh_info
;
4486 extsymoff
= symtab_hdr
->sh_info
;
4489 /* Read the local symbols. */
4490 if (symtab_hdr
->contents
!= NULL
)
4491 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4492 else if (locsymcount
== 0)
4493 external_syms
= NULL
;
4496 external_syms
= finfo
->external_syms
;
4497 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4498 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4499 locsymcount
, input_bfd
)
4500 != locsymcount
* sizeof (Elf_External_Sym
)))
4504 /* Swap in the local symbols and write out the ones which we know
4505 are going into the output file. */
4506 esym
= external_syms
;
4507 esymend
= esym
+ locsymcount
;
4508 isym
= finfo
->internal_syms
;
4509 pindex
= finfo
->indices
;
4510 ppsection
= finfo
->sections
;
4511 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4515 Elf_Internal_Sym osym
;
4517 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4520 if (elf_bad_symtab (input_bfd
))
4522 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4529 if (isym
->st_shndx
== SHN_UNDEF
)
4530 isec
= bfd_und_section_ptr
;
4531 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4532 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4533 else if (isym
->st_shndx
== SHN_ABS
)
4534 isec
= bfd_abs_section_ptr
;
4535 else if (isym
->st_shndx
== SHN_COMMON
)
4536 isec
= bfd_com_section_ptr
;
4545 /* Don't output the first, undefined, symbol. */
4546 if (esym
== external_syms
)
4549 /* If we are stripping all symbols, we don't want to output this
4551 if (finfo
->info
->strip
== strip_all
)
4554 /* We never output section symbols. Instead, we use the section
4555 symbol of the corresponding section in the output file. */
4556 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4559 /* If we are discarding all local symbols, we don't want to
4560 output this one. If we are generating a relocateable output
4561 file, then some of the local symbols may be required by
4562 relocs; we output them below as we discover that they are
4564 if (finfo
->info
->discard
== discard_all
)
4567 /* If this symbol is defined in a section which we are
4568 discarding, we don't need to keep it, but note that
4569 linker_mark is only reliable for sections that have contents.
4570 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4571 as well as linker_mark. */
4572 if (isym
->st_shndx
> 0
4573 && isym
->st_shndx
< SHN_LORESERVE
4575 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4576 || (! finfo
->info
->relocateable
4577 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4580 /* Get the name of the symbol. */
4581 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4586 /* See if we are discarding symbols with this name. */
4587 if ((finfo
->info
->strip
== strip_some
4588 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4590 || (finfo
->info
->discard
== discard_l
4591 && bfd_is_local_label_name (input_bfd
, name
)))
4594 /* If we get here, we are going to output this symbol. */
4598 /* Adjust the section index for the output file. */
4599 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4600 isec
->output_section
);
4601 if (osym
.st_shndx
== (unsigned short) -1)
4604 *pindex
= output_bfd
->symcount
;
4606 /* ELF symbols in relocateable files are section relative, but
4607 in executable files they are virtual addresses. Note that
4608 this code assumes that all ELF sections have an associated
4609 BFD section with a reasonable value for output_offset; below
4610 we assume that they also have a reasonable value for
4611 output_section. Any special sections must be set up to meet
4612 these requirements. */
4613 osym
.st_value
+= isec
->output_offset
;
4614 if (! finfo
->info
->relocateable
)
4615 osym
.st_value
+= isec
->output_section
->vma
;
4617 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4621 /* Relocate the contents of each section. */
4622 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4626 if (! o
->linker_mark
)
4628 /* This section was omitted from the link. */
4632 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4633 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4636 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4638 /* Section was created by elf_link_create_dynamic_sections
4643 /* Get the contents of the section. They have been cached by a
4644 relaxation routine. Note that o is a section in an input
4645 file, so the contents field will not have been set by any of
4646 the routines which work on output files. */
4647 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4648 contents
= elf_section_data (o
)->this_hdr
.contents
;
4651 contents
= finfo
->contents
;
4652 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4653 (file_ptr
) 0, o
->_raw_size
))
4657 if ((o
->flags
& SEC_RELOC
) != 0)
4659 Elf_Internal_Rela
*internal_relocs
;
4661 /* Get the swapped relocs. */
4662 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4663 (input_bfd
, o
, finfo
->external_relocs
,
4664 finfo
->internal_relocs
, false));
4665 if (internal_relocs
== NULL
4666 && o
->reloc_count
> 0)
4669 /* Relocate the section by invoking a back end routine.
4671 The back end routine is responsible for adjusting the
4672 section contents as necessary, and (if using Rela relocs
4673 and generating a relocateable output file) adjusting the
4674 reloc addend as necessary.
4676 The back end routine does not have to worry about setting
4677 the reloc address or the reloc symbol index.
4679 The back end routine is given a pointer to the swapped in
4680 internal symbols, and can access the hash table entries
4681 for the external symbols via elf_sym_hashes (input_bfd).
4683 When generating relocateable output, the back end routine
4684 must handle STB_LOCAL/STT_SECTION symbols specially. The
4685 output symbol is going to be a section symbol
4686 corresponding to the output section, which will require
4687 the addend to be adjusted. */
4689 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4690 input_bfd
, o
, contents
,
4692 finfo
->internal_syms
,
4696 if (finfo
->info
->relocateable
)
4698 Elf_Internal_Rela
*irela
;
4699 Elf_Internal_Rela
*irelaend
;
4700 struct elf_link_hash_entry
**rel_hash
;
4701 Elf_Internal_Shdr
*input_rel_hdr
;
4702 Elf_Internal_Shdr
*output_rel_hdr
;
4704 /* Adjust the reloc addresses and symbol indices. */
4706 irela
= internal_relocs
;
4707 irelaend
= irela
+ o
->reloc_count
;
4708 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4709 + o
->output_section
->reloc_count
);
4710 for (; irela
< irelaend
; irela
++, rel_hash
++)
4712 unsigned long r_symndx
;
4713 Elf_Internal_Sym
*isym
;
4716 irela
->r_offset
+= o
->output_offset
;
4718 r_symndx
= ELF_R_SYM (irela
->r_info
);
4723 if (r_symndx
>= locsymcount
4724 || (elf_bad_symtab (input_bfd
)
4725 && finfo
->sections
[r_symndx
] == NULL
))
4729 /* This is a reloc against a global symbol. We
4730 have not yet output all the local symbols, so
4731 we do not know the symbol index of any global
4732 symbol. We set the rel_hash entry for this
4733 reloc to point to the global hash table entry
4734 for this symbol. The symbol index is then
4735 set at the end of elf_bfd_final_link. */
4736 indx
= r_symndx
- extsymoff
;
4737 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4739 /* Setting the index to -2 tells
4740 elf_link_output_extsym that this symbol is
4742 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4743 (*rel_hash
)->indx
= -2;
4748 /* This is a reloc against a local symbol. */
4751 isym
= finfo
->internal_syms
+ r_symndx
;
4752 sec
= finfo
->sections
[r_symndx
];
4753 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4755 /* I suppose the backend ought to fill in the
4756 section of any STT_SECTION symbol against a
4757 processor specific section. If we have
4758 discarded a section, the output_section will
4759 be the absolute section. */
4761 && (bfd_is_abs_section (sec
)
4762 || (sec
->output_section
!= NULL
4763 && bfd_is_abs_section (sec
->output_section
))))
4765 else if (sec
== NULL
|| sec
->owner
== NULL
)
4767 bfd_set_error (bfd_error_bad_value
);
4772 r_symndx
= sec
->output_section
->target_index
;
4773 BFD_ASSERT (r_symndx
!= 0);
4778 if (finfo
->indices
[r_symndx
] == -1)
4784 if (finfo
->info
->strip
== strip_all
)
4786 /* You can't do ld -r -s. */
4787 bfd_set_error (bfd_error_invalid_operation
);
4791 /* This symbol was skipped earlier, but
4792 since it is needed by a reloc, we
4793 must output it now. */
4794 link
= symtab_hdr
->sh_link
;
4795 name
= bfd_elf_string_from_elf_section (input_bfd
,
4801 osec
= sec
->output_section
;
4803 _bfd_elf_section_from_bfd_section (output_bfd
,
4805 if (isym
->st_shndx
== (unsigned short) -1)
4808 isym
->st_value
+= sec
->output_offset
;
4809 if (! finfo
->info
->relocateable
)
4810 isym
->st_value
+= osec
->vma
;
4812 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4814 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4818 r_symndx
= finfo
->indices
[r_symndx
];
4821 irela
->r_info
= ELF_R_INFO (r_symndx
,
4822 ELF_R_TYPE (irela
->r_info
));
4825 /* Swap out the relocs. */
4826 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4827 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4828 BFD_ASSERT (output_rel_hdr
->sh_entsize
4829 == input_rel_hdr
->sh_entsize
);
4830 irela
= internal_relocs
;
4831 irelaend
= irela
+ o
->reloc_count
;
4832 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4834 Elf_External_Rel
*erel
;
4836 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4837 + o
->output_section
->reloc_count
);
4838 for (; irela
< irelaend
; irela
++, erel
++)
4840 Elf_Internal_Rel irel
;
4842 irel
.r_offset
= irela
->r_offset
;
4843 irel
.r_info
= irela
->r_info
;
4844 BFD_ASSERT (irela
->r_addend
== 0);
4845 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4850 Elf_External_Rela
*erela
;
4852 BFD_ASSERT (input_rel_hdr
->sh_entsize
4853 == sizeof (Elf_External_Rela
));
4854 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4855 + o
->output_section
->reloc_count
);
4856 for (; irela
< irelaend
; irela
++, erela
++)
4857 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4860 o
->output_section
->reloc_count
+= o
->reloc_count
;
4864 /* Write out the modified section contents. */
4865 if (elf_section_data (o
)->stab_info
== NULL
)
4867 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4868 contents
, o
->output_offset
,
4869 (o
->_cooked_size
!= 0
4876 if (! (_bfd_write_section_stabs
4877 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4878 o
, &elf_section_data (o
)->stab_info
, contents
)))
4886 /* Generate a reloc when linking an ELF file. This is a reloc
4887 requested by the linker, and does come from any input file. This
4888 is used to build constructor and destructor tables when linking
4892 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4894 struct bfd_link_info
*info
;
4895 asection
*output_section
;
4896 struct bfd_link_order
*link_order
;
4898 reloc_howto_type
*howto
;
4902 struct elf_link_hash_entry
**rel_hash_ptr
;
4903 Elf_Internal_Shdr
*rel_hdr
;
4905 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4908 bfd_set_error (bfd_error_bad_value
);
4912 addend
= link_order
->u
.reloc
.p
->addend
;
4914 /* Figure out the symbol index. */
4915 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4916 + output_section
->reloc_count
);
4917 if (link_order
->type
== bfd_section_reloc_link_order
)
4919 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4920 BFD_ASSERT (indx
!= 0);
4921 *rel_hash_ptr
= NULL
;
4925 struct elf_link_hash_entry
*h
;
4927 /* Treat a reloc against a defined symbol as though it were
4928 actually against the section. */
4929 h
= ((struct elf_link_hash_entry
*)
4930 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4931 link_order
->u
.reloc
.p
->u
.name
,
4932 false, false, true));
4934 && (h
->root
.type
== bfd_link_hash_defined
4935 || h
->root
.type
== bfd_link_hash_defweak
))
4939 section
= h
->root
.u
.def
.section
;
4940 indx
= section
->output_section
->target_index
;
4941 *rel_hash_ptr
= NULL
;
4942 /* It seems that we ought to add the symbol value to the
4943 addend here, but in practice it has already been added
4944 because it was passed to constructor_callback. */
4945 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4949 /* Setting the index to -2 tells elf_link_output_extsym that
4950 this symbol is used by a reloc. */
4957 if (! ((*info
->callbacks
->unattached_reloc
)
4958 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4959 (asection
*) NULL
, (bfd_vma
) 0)))
4965 /* If this is an inplace reloc, we must write the addend into the
4967 if (howto
->partial_inplace
&& addend
!= 0)
4970 bfd_reloc_status_type rstat
;
4974 size
= bfd_get_reloc_size (howto
);
4975 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4976 if (buf
== (bfd_byte
*) NULL
)
4978 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4984 case bfd_reloc_outofrange
:
4986 case bfd_reloc_overflow
:
4987 if (! ((*info
->callbacks
->reloc_overflow
)
4989 (link_order
->type
== bfd_section_reloc_link_order
4990 ? bfd_section_name (output_bfd
,
4991 link_order
->u
.reloc
.p
->u
.section
)
4992 : link_order
->u
.reloc
.p
->u
.name
),
4993 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5001 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5002 (file_ptr
) link_order
->offset
, size
);
5008 /* The address of a reloc is relative to the section in a
5009 relocateable file, and is a virtual address in an executable
5011 offset
= link_order
->offset
;
5012 if (! info
->relocateable
)
5013 offset
+= output_section
->vma
;
5015 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5017 if (rel_hdr
->sh_type
== SHT_REL
)
5019 Elf_Internal_Rel irel
;
5020 Elf_External_Rel
*erel
;
5022 irel
.r_offset
= offset
;
5023 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5024 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5025 + output_section
->reloc_count
);
5026 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5030 Elf_Internal_Rela irela
;
5031 Elf_External_Rela
*erela
;
5033 irela
.r_offset
= offset
;
5034 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5035 irela
.r_addend
= addend
;
5036 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5037 + output_section
->reloc_count
);
5038 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5041 ++output_section
->reloc_count
;
5047 /* Allocate a pointer to live in a linker created section. */
5050 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5052 struct bfd_link_info
*info
;
5053 elf_linker_section_t
*lsect
;
5054 struct elf_link_hash_entry
*h
;
5055 const Elf_Internal_Rela
*rel
;
5057 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5058 elf_linker_section_pointers_t
*linker_section_ptr
;
5059 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5061 BFD_ASSERT (lsect
!= NULL
);
5063 /* Is this a global symbol? */
5066 /* Has this symbol already been allocated, if so, our work is done */
5067 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5072 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5073 /* Make sure this symbol is output as a dynamic symbol. */
5074 if (h
->dynindx
== -1)
5076 if (! elf_link_record_dynamic_symbol (info
, h
))
5080 if (lsect
->rel_section
)
5081 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5084 else /* Allocation of a pointer to a local symbol */
5086 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5088 /* Allocate a table to hold the local symbols if first time */
5091 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5092 register unsigned int i
;
5094 ptr
= (elf_linker_section_pointers_t
**)
5095 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5100 elf_local_ptr_offsets (abfd
) = ptr
;
5101 for (i
= 0; i
< num_symbols
; i
++)
5102 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5105 /* Has this symbol already been allocated, if so, our work is done */
5106 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5111 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5115 /* If we are generating a shared object, we need to
5116 output a R_<xxx>_RELATIVE reloc so that the
5117 dynamic linker can adjust this GOT entry. */
5118 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5119 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5123 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5124 from internal memory. */
5125 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5126 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5127 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5129 if (!linker_section_ptr
)
5132 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5133 linker_section_ptr
->addend
= rel
->r_addend
;
5134 linker_section_ptr
->which
= lsect
->which
;
5135 linker_section_ptr
->written_address_p
= false;
5136 *ptr_linker_section_ptr
= linker_section_ptr
;
5139 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5141 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5142 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5143 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5144 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5146 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5148 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5149 lsect
->sym_hash
->root
.root
.string
,
5150 (long)ARCH_SIZE
/ 8,
5151 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5157 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5159 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5162 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5163 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5171 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5174 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5177 /* Fill in the address for a pointer generated in alinker section. */
5180 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5183 struct bfd_link_info
*info
;
5184 elf_linker_section_t
*lsect
;
5185 struct elf_link_hash_entry
*h
;
5187 const Elf_Internal_Rela
*rel
;
5190 elf_linker_section_pointers_t
*linker_section_ptr
;
5192 BFD_ASSERT (lsect
!= NULL
);
5194 if (h
!= NULL
) /* global symbol */
5196 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5200 BFD_ASSERT (linker_section_ptr
!= NULL
);
5202 if (! elf_hash_table (info
)->dynamic_sections_created
5205 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5207 /* This is actually a static link, or it is a
5208 -Bsymbolic link and the symbol is defined
5209 locally. We must initialize this entry in the
5212 When doing a dynamic link, we create a .rela.<xxx>
5213 relocation entry to initialize the value. This
5214 is done in the finish_dynamic_symbol routine. */
5215 if (!linker_section_ptr
->written_address_p
)
5217 linker_section_ptr
->written_address_p
= true;
5218 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5219 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5223 else /* local symbol */
5225 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5226 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5227 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5228 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5232 BFD_ASSERT (linker_section_ptr
!= NULL
);
5234 /* Write out pointer if it hasn't been rewritten out before */
5235 if (!linker_section_ptr
->written_address_p
)
5237 linker_section_ptr
->written_address_p
= true;
5238 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5239 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5243 asection
*srel
= lsect
->rel_section
;
5244 Elf_Internal_Rela outrel
;
5246 /* We need to generate a relative reloc for the dynamic linker. */
5248 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5251 BFD_ASSERT (srel
!= NULL
);
5253 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5254 + lsect
->section
->output_offset
5255 + linker_section_ptr
->offset
);
5256 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5257 outrel
.r_addend
= 0;
5258 elf_swap_reloca_out (output_bfd
, &outrel
,
5259 (((Elf_External_Rela
*)
5260 lsect
->section
->contents
)
5261 + lsect
->section
->reloc_count
));
5262 ++lsect
->section
->reloc_count
;
5267 relocation
= (lsect
->section
->output_offset
5268 + linker_section_ptr
->offset
5269 - lsect
->hole_offset
5270 - lsect
->sym_offset
);
5273 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5274 lsect
->name
, (long)relocation
, (long)relocation
);
5277 /* Subtract out the addend, because it will get added back in by the normal
5279 return relocation
- linker_section_ptr
->addend
;