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
;
301 /* This code is for coping with dynamic objects, and is only useful
302 if we are doing an ELF link. */
303 if (info
->hash
->creator
!= abfd
->xvec
)
307 *type_change_ok
= false;
308 *size_change_ok
= false;
311 bind
= ELF_ST_BIND (sym
->st_info
);
313 if (! bfd_is_und_section (sec
))
314 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
316 h
= ((struct elf_link_hash_entry
*)
317 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
322 /* If we just created the symbol, mark it as being an ELF symbol.
323 Other than that, there is nothing to do--there is no merge issue
324 with a newly defined symbol--so we just return. */
326 if (h
->root
.type
== bfd_link_hash_new
)
328 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
332 /* For merging, we only care about real symbols. */
334 while (h
->root
.type
== bfd_link_hash_indirect
335 || h
->root
.type
== bfd_link_hash_warning
)
336 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
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
580 /* Handle the special case of a new common symbol merging with an
581 old symbol that looks like it might be a common symbol defined in
582 a shared object. Note that we have already handled the case in
583 which a new common symbol should simply override the definition
584 in the shared library. */
587 && bfd_is_com_section (sec
)
590 /* It would be best if we could set the hash table entry to a
591 common symbol, but we don't know what to use for the section
593 if (! ((*info
->callbacks
->multiple_common
)
594 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
595 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
598 /* If the predumed common symbol in the dynamic object is
599 larger, pretend that the new symbol has its size. */
601 if (h
->size
> *pvalue
)
604 /* FIXME: We no longer know the alignment required by the symbol
605 in the dynamic object, so we just wind up using the one from
606 the regular object. */
609 olddyncommon
= false;
611 h
->root
.type
= bfd_link_hash_undefined
;
612 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
614 *size_change_ok
= true;
615 *type_change_ok
= true;
617 h
->verinfo
.vertree
= NULL
;
623 /* Add symbols from an ELF object file to the linker hash table. */
626 elf_link_add_object_symbols (abfd
, info
)
628 struct bfd_link_info
*info
;
630 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
631 const Elf_Internal_Sym
*,
632 const char **, flagword
*,
633 asection
**, bfd_vma
*));
634 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
635 asection
*, const Elf_Internal_Rela
*));
637 Elf_Internal_Shdr
*hdr
;
641 Elf_External_Sym
*buf
= NULL
;
642 struct elf_link_hash_entry
**sym_hash
;
644 bfd_byte
*dynver
= NULL
;
645 Elf_External_Versym
*extversym
= NULL
;
646 Elf_External_Versym
*ever
;
647 Elf_External_Dyn
*dynbuf
= NULL
;
648 struct elf_link_hash_entry
*weaks
;
649 Elf_External_Sym
*esym
;
650 Elf_External_Sym
*esymend
;
652 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
653 collect
= get_elf_backend_data (abfd
)->collect
;
655 if ((abfd
->flags
& DYNAMIC
) == 0)
661 /* You can't use -r against a dynamic object. Also, there's no
662 hope of using a dynamic object which does not exactly match
663 the format of the output file. */
664 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
666 bfd_set_error (bfd_error_invalid_operation
);
671 /* As a GNU extension, any input sections which are named
672 .gnu.warning.SYMBOL are treated as warning symbols for the given
673 symbol. This differs from .gnu.warning sections, which generate
674 warnings when they are included in an output file. */
679 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
683 name
= bfd_get_section_name (abfd
, s
);
684 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
689 name
+= sizeof ".gnu.warning." - 1;
691 /* If this is a shared object, then look up the symbol
692 in the hash table. If it is there, and it is already
693 been defined, then we will not be using the entry
694 from this shared object, so we don't need to warn.
695 FIXME: If we see the definition in a regular object
696 later on, we will warn, but we shouldn't. The only
697 fix is to keep track of what warnings we are supposed
698 to emit, and then handle them all at the end of the
700 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
702 struct elf_link_hash_entry
*h
;
704 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
707 /* FIXME: What about bfd_link_hash_common? */
709 && (h
->root
.type
== bfd_link_hash_defined
710 || h
->root
.type
== bfd_link_hash_defweak
))
712 /* We don't want to issue this warning. Clobber
713 the section size so that the warning does not
714 get copied into the output file. */
720 sz
= bfd_section_size (abfd
, s
);
721 msg
= (char *) bfd_alloc (abfd
, sz
);
725 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
728 if (! (_bfd_generic_link_add_one_symbol
729 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
730 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
733 if (! info
->relocateable
)
735 /* Clobber the section size so that the warning does
736 not get copied into the output file. */
743 /* If this is a dynamic object, we always link against the .dynsym
744 symbol table, not the .symtab symbol table. The dynamic linker
745 will only see the .dynsym symbol table, so there is no reason to
746 look at .symtab for a dynamic object. */
748 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
749 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
751 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
755 /* Read in any version definitions. */
757 if (! _bfd_elf_slurp_version_tables (abfd
))
760 /* Read in the symbol versions, but don't bother to convert them
761 to internal format. */
762 if (elf_dynversym (abfd
) != 0)
764 Elf_Internal_Shdr
*versymhdr
;
766 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
767 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
768 if (extversym
== NULL
)
770 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
771 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
772 != versymhdr
->sh_size
))
777 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
779 /* The sh_info field of the symtab header tells us where the
780 external symbols start. We don't care about the local symbols at
782 if (elf_bad_symtab (abfd
))
784 extsymcount
= symcount
;
789 extsymcount
= symcount
- hdr
->sh_info
;
790 extsymoff
= hdr
->sh_info
;
793 buf
= ((Elf_External_Sym
*)
794 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
795 if (buf
== NULL
&& extsymcount
!= 0)
798 /* We store a pointer to the hash table entry for each external
800 sym_hash
= ((struct elf_link_hash_entry
**)
802 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
803 if (sym_hash
== NULL
)
805 elf_sym_hashes (abfd
) = sym_hash
;
809 /* If we are creating a shared library, create all the dynamic
810 sections immediately. We need to attach them to something,
811 so we attach them to this BFD, provided it is the right
812 format. FIXME: If there are no input BFD's of the same
813 format as the output, we can't make a shared library. */
815 && ! elf_hash_table (info
)->dynamic_sections_created
816 && abfd
->xvec
== info
->hash
->creator
)
818 if (! elf_link_create_dynamic_sections (abfd
, info
))
827 bfd_size_type oldsize
;
828 bfd_size_type strindex
;
830 /* Find the name to use in a DT_NEEDED entry that refers to this
831 object. If the object has a DT_SONAME entry, we use it.
832 Otherwise, if the generic linker stuck something in
833 elf_dt_name, we use that. Otherwise, we just use the file
834 name. If the generic linker put a null string into
835 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
836 there is a DT_SONAME entry. */
838 name
= bfd_get_filename (abfd
);
839 if (elf_dt_name (abfd
) != NULL
)
841 name
= elf_dt_name (abfd
);
845 s
= bfd_get_section_by_name (abfd
, ".dynamic");
848 Elf_External_Dyn
*extdyn
;
849 Elf_External_Dyn
*extdynend
;
853 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
857 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
858 (file_ptr
) 0, s
->_raw_size
))
861 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
864 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
867 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
868 for (; extdyn
< extdynend
; extdyn
++)
870 Elf_Internal_Dyn dyn
;
872 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
873 if (dyn
.d_tag
== DT_SONAME
)
875 name
= bfd_elf_string_from_elf_section (abfd
, link
,
880 if (dyn
.d_tag
== DT_NEEDED
)
882 struct bfd_link_needed_list
*n
, **pn
;
885 n
= ((struct bfd_link_needed_list
*)
886 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
887 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
889 if (n
== NULL
|| fnm
== NULL
)
891 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
898 for (pn
= &elf_hash_table (info
)->needed
;
910 /* We do not want to include any of the sections in a dynamic
911 object in the output file. We hack by simply clobbering the
912 list of sections in the BFD. This could be handled more
913 cleanly by, say, a new section flag; the existing
914 SEC_NEVER_LOAD flag is not the one we want, because that one
915 still implies that the section takes up space in the output
917 abfd
->sections
= NULL
;
918 abfd
->section_count
= 0;
920 /* If this is the first dynamic object found in the link, create
921 the special sections required for dynamic linking. */
922 if (! elf_hash_table (info
)->dynamic_sections_created
)
924 if (! elf_link_create_dynamic_sections (abfd
, info
))
930 /* Add a DT_NEEDED entry for this dynamic object. */
931 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
932 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
934 if (strindex
== (bfd_size_type
) -1)
937 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
940 Elf_External_Dyn
*dyncon
, *dynconend
;
942 /* The hash table size did not change, which means that
943 the dynamic object name was already entered. If we
944 have already included this dynamic object in the
945 link, just ignore it. There is no reason to include
946 a particular dynamic object more than once. */
947 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
949 BFD_ASSERT (sdyn
!= NULL
);
951 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
952 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
954 for (; dyncon
< dynconend
; dyncon
++)
956 Elf_Internal_Dyn dyn
;
958 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
960 if (dyn
.d_tag
== DT_NEEDED
961 && dyn
.d_un
.d_val
== strindex
)
965 if (extversym
!= NULL
)
972 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
976 /* Save the SONAME, if there is one, because sometimes the
977 linker emulation code will need to know it. */
979 name
= bfd_get_filename (abfd
);
980 elf_dt_name (abfd
) = name
;
984 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
986 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
987 != extsymcount
* sizeof (Elf_External_Sym
)))
992 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
993 esymend
= buf
+ extsymcount
;
996 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
998 Elf_Internal_Sym sym
;
1004 struct elf_link_hash_entry
*h
;
1006 boolean size_change_ok
, type_change_ok
;
1007 boolean new_weakdef
;
1008 unsigned int old_alignment
;
1010 elf_swap_symbol_in (abfd
, esym
, &sym
);
1012 flags
= BSF_NO_FLAGS
;
1014 value
= sym
.st_value
;
1017 bind
= ELF_ST_BIND (sym
.st_info
);
1018 if (bind
== STB_LOCAL
)
1020 /* This should be impossible, since ELF requires that all
1021 global symbols follow all local symbols, and that sh_info
1022 point to the first global symbol. Unfortunatealy, Irix 5
1026 else if (bind
== STB_GLOBAL
)
1028 if (sym
.st_shndx
!= SHN_UNDEF
1029 && sym
.st_shndx
!= SHN_COMMON
)
1034 else if (bind
== STB_WEAK
)
1038 /* Leave it up to the processor backend. */
1041 if (sym
.st_shndx
== SHN_UNDEF
)
1042 sec
= bfd_und_section_ptr
;
1043 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1045 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1047 sec
= bfd_abs_section_ptr
;
1048 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1051 else if (sym
.st_shndx
== SHN_ABS
)
1052 sec
= bfd_abs_section_ptr
;
1053 else if (sym
.st_shndx
== SHN_COMMON
)
1055 sec
= bfd_com_section_ptr
;
1056 /* What ELF calls the size we call the value. What ELF
1057 calls the value we call the alignment. */
1058 value
= sym
.st_size
;
1062 /* Leave it up to the processor backend. */
1065 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1066 if (name
== (const char *) NULL
)
1069 if (add_symbol_hook
)
1071 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1075 /* The hook function sets the name to NULL if this symbol
1076 should be skipped for some reason. */
1077 if (name
== (const char *) NULL
)
1081 /* Sanity check that all possibilities were handled. */
1082 if (sec
== (asection
*) NULL
)
1084 bfd_set_error (bfd_error_bad_value
);
1088 if (bfd_is_und_section (sec
)
1089 || bfd_is_com_section (sec
))
1094 size_change_ok
= false;
1095 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1097 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1099 Elf_Internal_Versym iver
;
1105 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1106 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1108 /* If this is a hidden symbol, or if it is not version
1109 1, we append the version name to the symbol name.
1110 However, we do not modify a non-hidden absolute
1111 symbol, because it might be the version symbol
1112 itself. FIXME: What if it isn't? */
1113 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1114 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1117 int namelen
, newlen
;
1120 if (sym
.st_shndx
!= SHN_UNDEF
)
1122 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1124 (*_bfd_error_handler
)
1125 ("%s: %s: invalid version %d (max %d)",
1126 abfd
->filename
, name
, vernum
,
1127 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1128 bfd_set_error (bfd_error_bad_value
);
1131 else if (vernum
> 1)
1133 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1139 /* We cannot simply test for the number of
1140 entries in the VERNEED section since the
1141 numbers for the needed versions do not start
1143 Elf_Internal_Verneed
*t
;
1146 for (t
= elf_tdata (abfd
)->verref
;
1150 Elf_Internal_Vernaux
*a
;
1152 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1154 if (a
->vna_other
== vernum
)
1156 verstr
= a
->vna_nodename
;
1165 (*_bfd_error_handler
)
1166 ("%s: %s: invalid needed version %d",
1167 abfd
->filename
, name
, vernum
);
1168 bfd_set_error (bfd_error_bad_value
);
1173 namelen
= strlen (name
);
1174 newlen
= namelen
+ strlen (verstr
) + 2;
1175 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1178 newname
= (char *) bfd_alloc (abfd
, newlen
);
1179 if (newname
== NULL
)
1181 strcpy (newname
, name
);
1182 p
= newname
+ namelen
;
1184 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1192 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1193 sym_hash
, &override
, &type_change_ok
,
1201 while (h
->root
.type
== bfd_link_hash_indirect
1202 || h
->root
.type
== bfd_link_hash_warning
)
1203 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1205 /* Remember the old alignment if this is a common symbol, so
1206 that we don't reduce the alignment later on. We can't
1207 check later, because _bfd_generic_link_add_one_symbol
1208 will set a default for the alignment which we want to
1210 if (h
->root
.type
== bfd_link_hash_common
)
1211 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1216 && (h
->verinfo
.verdef
== NULL
|| definition
))
1217 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1220 if (! (_bfd_generic_link_add_one_symbol
1221 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1222 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1226 while (h
->root
.type
== bfd_link_hash_indirect
1227 || h
->root
.type
== bfd_link_hash_warning
)
1228 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1231 new_weakdef
= false;
1234 && (flags
& BSF_WEAK
) != 0
1235 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1236 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1237 && h
->weakdef
== NULL
)
1239 /* Keep a list of all weak defined non function symbols from
1240 a dynamic object, using the weakdef field. Later in this
1241 function we will set the weakdef field to the correct
1242 value. We only put non-function symbols from dynamic
1243 objects on this list, because that happens to be the only
1244 time we need to know the normal symbol corresponding to a
1245 weak symbol, and the information is time consuming to
1246 figure out. If the weakdef field is not already NULL,
1247 then this symbol was already defined by some previous
1248 dynamic object, and we will be using that previous
1249 definition anyhow. */
1256 /* Set the alignment of a common symbol. */
1257 if (sym
.st_shndx
== SHN_COMMON
1258 && h
->root
.type
== bfd_link_hash_common
)
1262 align
= bfd_log2 (sym
.st_value
);
1263 if (align
> old_alignment
)
1264 h
->root
.u
.c
.p
->alignment_power
= align
;
1267 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1273 /* Remember the symbol size and type. */
1274 if (sym
.st_size
!= 0
1275 && (definition
|| h
->size
== 0))
1277 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1278 (*_bfd_error_handler
)
1279 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1280 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1281 bfd_get_filename (abfd
));
1283 h
->size
= sym
.st_size
;
1286 /* If this is a common symbol, then we always want H->SIZE
1287 to be the size of the common symbol. The code just above
1288 won't fix the size if a common symbol becomes larger. We
1289 don't warn about a size change here, because that is
1290 covered by --warn-common. */
1291 if (h
->root
.type
== bfd_link_hash_common
)
1292 h
->size
= h
->root
.u
.c
.size
;
1294 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1295 && (definition
|| h
->type
== STT_NOTYPE
))
1297 if (h
->type
!= STT_NOTYPE
1298 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1299 && ! type_change_ok
)
1300 (*_bfd_error_handler
)
1301 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1302 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1303 bfd_get_filename (abfd
));
1305 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1308 if (sym
.st_other
!= 0
1309 && (definition
|| h
->other
== 0))
1310 h
->other
= sym
.st_other
;
1312 /* Set a flag in the hash table entry indicating the type of
1313 reference or definition we just found. Keep a count of
1314 the number of dynamic symbols we find. A dynamic symbol
1315 is one which is referenced or defined by both a regular
1316 object and a shared object. */
1317 old_flags
= h
->elf_link_hash_flags
;
1322 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1324 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1326 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1327 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1333 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1335 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1336 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1337 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1338 || (h
->weakdef
!= NULL
1340 && h
->weakdef
->dynindx
!= -1))
1344 h
->elf_link_hash_flags
|= new_flag
;
1346 /* If this symbol has a version, and it is the default
1347 version, we create an indirect symbol from the default
1348 name to the fully decorated name. This will cause
1349 external references which do not specify a version to be
1350 bound to this version of the symbol. */
1355 p
= strchr (name
, ELF_VER_CHR
);
1356 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1359 struct elf_link_hash_entry
*hi
;
1362 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1364 if (shortname
== NULL
)
1366 strncpy (shortname
, name
, p
- name
);
1367 shortname
[p
- name
] = '\0';
1369 /* We are going to create a new symbol. Merge it
1370 with any existing symbol with this name. For the
1371 purposes of the merge, act as though we were
1372 defining the symbol we just defined, although we
1373 actually going to define an indirect symbol. */
1374 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1375 &value
, &hi
, &override
,
1376 &type_change_ok
, &size_change_ok
))
1381 if (! (_bfd_generic_link_add_one_symbol
1382 (info
, abfd
, shortname
, BSF_INDIRECT
,
1383 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1384 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1389 /* In this case the symbol named SHORTNAME is
1390 overriding the indirect symbol we want to
1391 add. We were planning on making SHORTNAME an
1392 indirect symbol referring to NAME. SHORTNAME
1393 is the name without a version. NAME is the
1394 fully versioned name, and it is the default
1397 Overriding means that we already saw a
1398 definition for the symbol SHORTNAME in a
1399 regular object, and it is overriding the
1400 symbol defined in the dynamic object.
1402 When this happens, we actually want to change
1403 NAME, the symbol we just added, to refer to
1404 SHORTNAME. This will cause references to
1405 NAME in the shared object to become
1406 references to SHORTNAME in the regular
1407 object. This is what we expect when we
1408 override a function in a shared object: that
1409 the references in the shared object will be
1410 mapped to the definition in the regular
1413 h
->root
.type
= bfd_link_hash_indirect
;
1414 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1415 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1417 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1418 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1419 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1423 /* Now set HI to H, so that the following code
1424 will set the other fields correctly. */
1428 /* If there is a duplicate definition somewhere,
1429 then HI may not point to an indirect symbol. We
1430 will have reported an error to the user in that
1433 if (hi
->root
.type
== bfd_link_hash_indirect
)
1435 struct elf_link_hash_entry
*ht
;
1437 /* If the symbol became indirect, then we assume
1438 that we have not seen a definition before. */
1439 BFD_ASSERT ((hi
->elf_link_hash_flags
1440 & (ELF_LINK_HASH_DEF_DYNAMIC
1441 | ELF_LINK_HASH_DEF_REGULAR
))
1444 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1446 /* Copy down any references that we may have
1447 already seen to the symbol which just became
1449 ht
->elf_link_hash_flags
|=
1450 (hi
->elf_link_hash_flags
1451 & (ELF_LINK_HASH_REF_DYNAMIC
1452 | ELF_LINK_HASH_REF_REGULAR
));
1454 /* Copy over the global table offset entry.
1455 This may have been already set up by a
1456 check_relocs routine. */
1457 if (ht
->got_offset
== (bfd_vma
) -1)
1459 ht
->got_offset
= hi
->got_offset
;
1460 hi
->got_offset
= (bfd_vma
) -1;
1462 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1464 if (ht
->dynindx
== -1)
1466 ht
->dynindx
= hi
->dynindx
;
1467 ht
->dynstr_index
= hi
->dynstr_index
;
1469 hi
->dynstr_index
= 0;
1471 BFD_ASSERT (hi
->dynindx
== -1);
1473 /* FIXME: There may be other information to copy
1474 over for particular targets. */
1476 /* See if the new flags lead us to realize that
1477 the symbol must be dynamic. */
1483 || ((hi
->elf_link_hash_flags
1484 & ELF_LINK_HASH_REF_DYNAMIC
)
1490 if ((hi
->elf_link_hash_flags
1491 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1497 /* We also need to define an indirection from the
1498 nondefault version of the symbol. */
1500 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1502 if (shortname
== NULL
)
1504 strncpy (shortname
, name
, p
- name
);
1505 strcpy (shortname
+ (p
- name
), p
+ 1);
1507 /* Once again, merge with any existing symbol. */
1508 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1509 &value
, &hi
, &override
,
1510 &type_change_ok
, &size_change_ok
))
1515 /* Here SHORTNAME is a versioned name, so we
1516 don't expect to see the type of override we
1517 do in the case above. */
1518 (*_bfd_error_handler
)
1519 ("%s: warning: unexpected redefinition of `%s'",
1520 bfd_get_filename (abfd
), shortname
);
1524 if (! (_bfd_generic_link_add_one_symbol
1525 (info
, abfd
, shortname
, BSF_INDIRECT
,
1526 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1527 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1530 /* If there is a duplicate definition somewhere,
1531 then HI may not point to an indirect symbol.
1532 We will have reported an error to the user in
1535 if (hi
->root
.type
== bfd_link_hash_indirect
)
1537 /* If the symbol became indirect, then we
1538 assume that we have not seen a definition
1540 BFD_ASSERT ((hi
->elf_link_hash_flags
1541 & (ELF_LINK_HASH_DEF_DYNAMIC
1542 | ELF_LINK_HASH_DEF_REGULAR
))
1545 /* Copy down any references that we may have
1546 already seen to the symbol which just
1548 h
->elf_link_hash_flags
|=
1549 (hi
->elf_link_hash_flags
1550 & (ELF_LINK_HASH_REF_DYNAMIC
1551 | ELF_LINK_HASH_REF_REGULAR
));
1553 /* Copy over the global table offset entry.
1554 This may have been already set up by a
1555 check_relocs routine. */
1556 if (h
->got_offset
== (bfd_vma
) -1)
1558 h
->got_offset
= hi
->got_offset
;
1559 hi
->got_offset
= (bfd_vma
) -1;
1561 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1563 if (h
->dynindx
== -1)
1565 h
->dynindx
= hi
->dynindx
;
1566 h
->dynstr_index
= hi
->dynstr_index
;
1568 hi
->dynstr_index
= 0;
1570 BFD_ASSERT (hi
->dynindx
== -1);
1572 /* FIXME: There may be other information to
1573 copy over for particular targets. */
1575 /* See if the new flags lead us to realize
1576 that the symbol must be dynamic. */
1582 || ((hi
->elf_link_hash_flags
1583 & ELF_LINK_HASH_REF_DYNAMIC
)
1589 if ((hi
->elf_link_hash_flags
1590 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1599 if (dynsym
&& h
->dynindx
== -1)
1601 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1603 if (h
->weakdef
!= NULL
1605 && h
->weakdef
->dynindx
== -1)
1607 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1615 /* Now set the weakdefs field correctly for all the weak defined
1616 symbols we found. The only way to do this is to search all the
1617 symbols. Since we only need the information for non functions in
1618 dynamic objects, that's the only time we actually put anything on
1619 the list WEAKS. We need this information so that if a regular
1620 object refers to a symbol defined weakly in a dynamic object, the
1621 real symbol in the dynamic object is also put in the dynamic
1622 symbols; we also must arrange for both symbols to point to the
1623 same memory location. We could handle the general case of symbol
1624 aliasing, but a general symbol alias can only be generated in
1625 assembler code, handling it correctly would be very time
1626 consuming, and other ELF linkers don't handle general aliasing
1628 while (weaks
!= NULL
)
1630 struct elf_link_hash_entry
*hlook
;
1633 struct elf_link_hash_entry
**hpp
;
1634 struct elf_link_hash_entry
**hppend
;
1637 weaks
= hlook
->weakdef
;
1638 hlook
->weakdef
= NULL
;
1640 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1641 || hlook
->root
.type
== bfd_link_hash_defweak
1642 || hlook
->root
.type
== bfd_link_hash_common
1643 || hlook
->root
.type
== bfd_link_hash_indirect
);
1644 slook
= hlook
->root
.u
.def
.section
;
1645 vlook
= hlook
->root
.u
.def
.value
;
1647 hpp
= elf_sym_hashes (abfd
);
1648 hppend
= hpp
+ extsymcount
;
1649 for (; hpp
< hppend
; hpp
++)
1651 struct elf_link_hash_entry
*h
;
1654 if (h
!= NULL
&& h
!= hlook
1655 && h
->root
.type
== bfd_link_hash_defined
1656 && h
->root
.u
.def
.section
== slook
1657 && h
->root
.u
.def
.value
== vlook
)
1661 /* If the weak definition is in the list of dynamic
1662 symbols, make sure the real definition is put there
1664 if (hlook
->dynindx
!= -1
1665 && h
->dynindx
== -1)
1667 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1671 /* If the real definition is in the list of dynamic
1672 symbols, make sure the weak definition is put there
1673 as well. If we don't do this, then the dynamic
1674 loader might not merge the entries for the real
1675 definition and the weak definition. */
1676 if (h
->dynindx
!= -1
1677 && hlook
->dynindx
== -1)
1679 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1694 if (extversym
!= NULL
)
1700 /* If this object is the same format as the output object, and it is
1701 not a shared library, then let the backend look through the
1704 This is required to build global offset table entries and to
1705 arrange for dynamic relocs. It is not required for the
1706 particular common case of linking non PIC code, even when linking
1707 against shared libraries, but unfortunately there is no way of
1708 knowing whether an object file has been compiled PIC or not.
1709 Looking through the relocs is not particularly time consuming.
1710 The problem is that we must either (1) keep the relocs in memory,
1711 which causes the linker to require additional runtime memory or
1712 (2) read the relocs twice from the input file, which wastes time.
1713 This would be a good case for using mmap.
1715 I have no idea how to handle linking PIC code into a file of a
1716 different format. It probably can't be done. */
1717 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1719 && abfd
->xvec
== info
->hash
->creator
1720 && check_relocs
!= NULL
)
1724 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1726 Elf_Internal_Rela
*internal_relocs
;
1729 if ((o
->flags
& SEC_RELOC
) == 0
1730 || o
->reloc_count
== 0
1731 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1732 && (o
->flags
& SEC_DEBUGGING
) != 0)
1733 || bfd_is_abs_section (o
->output_section
))
1736 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1737 (abfd
, o
, (PTR
) NULL
,
1738 (Elf_Internal_Rela
*) NULL
,
1739 info
->keep_memory
));
1740 if (internal_relocs
== NULL
)
1743 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1745 if (! info
->keep_memory
)
1746 free (internal_relocs
);
1753 /* If this is a non-traditional, non-relocateable link, try to
1754 optimize the handling of the .stab/.stabstr sections. */
1756 && ! info
->relocateable
1757 && ! info
->traditional_format
1758 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1759 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1761 asection
*stab
, *stabstr
;
1763 stab
= bfd_get_section_by_name (abfd
, ".stab");
1766 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1768 if (stabstr
!= NULL
)
1770 struct bfd_elf_section_data
*secdata
;
1772 secdata
= elf_section_data (stab
);
1773 if (! _bfd_link_section_stabs (abfd
,
1774 &elf_hash_table (info
)->stab_info
,
1776 &secdata
->stab_info
))
1791 if (extversym
!= NULL
)
1796 /* Create some sections which will be filled in with dynamic linking
1797 information. ABFD is an input file which requires dynamic sections
1798 to be created. The dynamic sections take up virtual memory space
1799 when the final executable is run, so we need to create them before
1800 addresses are assigned to the output sections. We work out the
1801 actual contents and size of these sections later. */
1804 elf_link_create_dynamic_sections (abfd
, info
)
1806 struct bfd_link_info
*info
;
1809 register asection
*s
;
1810 struct elf_link_hash_entry
*h
;
1811 struct elf_backend_data
*bed
;
1813 if (elf_hash_table (info
)->dynamic_sections_created
)
1816 /* Make sure that all dynamic sections use the same input BFD. */
1817 if (elf_hash_table (info
)->dynobj
== NULL
)
1818 elf_hash_table (info
)->dynobj
= abfd
;
1820 abfd
= elf_hash_table (info
)->dynobj
;
1822 /* Note that we set the SEC_IN_MEMORY flag for all of these
1824 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1825 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1827 /* A dynamically linked executable has a .interp section, but a
1828 shared library does not. */
1831 s
= bfd_make_section (abfd
, ".interp");
1833 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1837 /* Create sections to hold version informations. These are removed
1838 if they are not needed. */
1839 s
= bfd_make_section (abfd
, ".gnu.version_d");
1841 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1842 || ! bfd_set_section_alignment (abfd
, s
, 2))
1845 s
= bfd_make_section (abfd
, ".gnu.version");
1847 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1848 || ! bfd_set_section_alignment (abfd
, s
, 1))
1851 s
= bfd_make_section (abfd
, ".gnu.version_r");
1853 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1854 || ! bfd_set_section_alignment (abfd
, s
, 2))
1857 s
= bfd_make_section (abfd
, ".dynsym");
1859 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1860 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1863 s
= bfd_make_section (abfd
, ".dynstr");
1865 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1868 /* Create a strtab to hold the dynamic symbol names. */
1869 if (elf_hash_table (info
)->dynstr
== NULL
)
1871 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1872 if (elf_hash_table (info
)->dynstr
== NULL
)
1876 s
= bfd_make_section (abfd
, ".dynamic");
1878 || ! bfd_set_section_flags (abfd
, s
, flags
)
1879 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1882 /* The special symbol _DYNAMIC is always set to the start of the
1883 .dynamic section. This call occurs before we have processed the
1884 symbols for any dynamic object, so we don't have to worry about
1885 overriding a dynamic definition. We could set _DYNAMIC in a
1886 linker script, but we only want to define it if we are, in fact,
1887 creating a .dynamic section. We don't want to define it if there
1888 is no .dynamic section, since on some ELF platforms the start up
1889 code examines it to decide how to initialize the process. */
1891 if (! (_bfd_generic_link_add_one_symbol
1892 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1893 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1894 (struct bfd_link_hash_entry
**) &h
)))
1896 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1897 h
->type
= STT_OBJECT
;
1900 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1903 s
= bfd_make_section (abfd
, ".hash");
1905 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1906 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1909 /* Let the backend create the rest of the sections. This lets the
1910 backend set the right flags. The backend will normally create
1911 the .got and .plt sections. */
1912 bed
= get_elf_backend_data (abfd
);
1913 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1916 elf_hash_table (info
)->dynamic_sections_created
= true;
1921 /* Add an entry to the .dynamic table. */
1924 elf_add_dynamic_entry (info
, tag
, val
)
1925 struct bfd_link_info
*info
;
1929 Elf_Internal_Dyn dyn
;
1933 bfd_byte
*newcontents
;
1935 dynobj
= elf_hash_table (info
)->dynobj
;
1937 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1938 BFD_ASSERT (s
!= NULL
);
1940 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1941 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1942 if (newcontents
== NULL
)
1946 dyn
.d_un
.d_val
= val
;
1947 elf_swap_dyn_out (dynobj
, &dyn
,
1948 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1950 s
->_raw_size
= newsize
;
1951 s
->contents
= newcontents
;
1957 /* Read and swap the relocs for a section. They may have been cached.
1958 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1959 they are used as buffers to read into. They are known to be large
1960 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1961 value is allocated using either malloc or bfd_alloc, according to
1962 the KEEP_MEMORY argument. */
1965 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1969 PTR external_relocs
;
1970 Elf_Internal_Rela
*internal_relocs
;
1971 boolean keep_memory
;
1973 Elf_Internal_Shdr
*rel_hdr
;
1975 Elf_Internal_Rela
*alloc2
= NULL
;
1977 if (elf_section_data (o
)->relocs
!= NULL
)
1978 return elf_section_data (o
)->relocs
;
1980 if (o
->reloc_count
== 0)
1983 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1985 if (internal_relocs
== NULL
)
1989 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1991 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1993 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1994 if (internal_relocs
== NULL
)
1998 if (external_relocs
== NULL
)
2000 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2003 external_relocs
= alloc1
;
2006 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2007 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2008 != rel_hdr
->sh_size
))
2011 /* Swap in the relocs. For convenience, we always produce an
2012 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2014 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2016 Elf_External_Rel
*erel
;
2017 Elf_External_Rel
*erelend
;
2018 Elf_Internal_Rela
*irela
;
2020 erel
= (Elf_External_Rel
*) external_relocs
;
2021 erelend
= erel
+ o
->reloc_count
;
2022 irela
= internal_relocs
;
2023 for (; erel
< erelend
; erel
++, irela
++)
2025 Elf_Internal_Rel irel
;
2027 elf_swap_reloc_in (abfd
, erel
, &irel
);
2028 irela
->r_offset
= irel
.r_offset
;
2029 irela
->r_info
= irel
.r_info
;
2030 irela
->r_addend
= 0;
2035 Elf_External_Rela
*erela
;
2036 Elf_External_Rela
*erelaend
;
2037 Elf_Internal_Rela
*irela
;
2039 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2041 erela
= (Elf_External_Rela
*) external_relocs
;
2042 erelaend
= erela
+ o
->reloc_count
;
2043 irela
= internal_relocs
;
2044 for (; erela
< erelaend
; erela
++, irela
++)
2045 elf_swap_reloca_in (abfd
, erela
, irela
);
2048 /* Cache the results for next time, if we can. */
2050 elf_section_data (o
)->relocs
= internal_relocs
;
2055 /* Don't free alloc2, since if it was allocated we are passing it
2056 back (under the name of internal_relocs). */
2058 return internal_relocs
;
2069 /* Record an assignment to a symbol made by a linker script. We need
2070 this in case some dynamic object refers to this symbol. */
2074 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2076 struct bfd_link_info
*info
;
2080 struct elf_link_hash_entry
*h
;
2082 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2085 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2089 if (h
->root
.type
== bfd_link_hash_new
)
2090 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2092 /* If this symbol is being provided by the linker script, and it is
2093 currently defined by a dynamic object, but not by a regular
2094 object, then mark it as undefined so that the generic linker will
2095 force the correct value. */
2097 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2098 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2099 h
->root
.type
= bfd_link_hash_undefined
;
2101 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2102 h
->type
= STT_OBJECT
;
2104 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2105 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2107 && h
->dynindx
== -1)
2109 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2112 /* If this is a weak defined symbol, and we know a corresponding
2113 real symbol from the same dynamic object, make sure the real
2114 symbol is also made into a dynamic symbol. */
2115 if (h
->weakdef
!= NULL
2116 && h
->weakdef
->dynindx
== -1)
2118 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2126 /* This structure is used to pass information to
2127 elf_link_assign_sym_version. */
2129 struct elf_assign_sym_version_info
2133 /* General link information. */
2134 struct bfd_link_info
*info
;
2136 struct bfd_elf_version_tree
*verdefs
;
2137 /* Whether we are exporting all dynamic symbols. */
2138 boolean export_dynamic
;
2139 /* Whether we removed any symbols from the dynamic symbol table. */
2140 boolean removed_dynamic
;
2141 /* Whether we had a failure. */
2145 /* This structure is used to pass information to
2146 elf_link_find_version_dependencies. */
2148 struct elf_find_verdep_info
2152 /* General link information. */
2153 struct bfd_link_info
*info
;
2154 /* The number of dependencies. */
2156 /* Whether we had a failure. */
2160 /* Array used to determine the number of hash table buckets to use
2161 based on the number of symbols there are. If there are fewer than
2162 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2163 fewer than 37 we use 17 buckets, and so forth. We never use more
2164 than 32771 buckets. */
2166 static const size_t elf_buckets
[] =
2168 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2172 /* Set up the sizes and contents of the ELF dynamic sections. This is
2173 called by the ELF linker emulation before_allocation routine. We
2174 must set the sizes of the sections before the linker sets the
2175 addresses of the various sections. */
2178 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2179 export_dynamic
, filter_shlib
,
2180 auxiliary_filters
, info
, sinterpptr
,
2185 boolean export_dynamic
;
2186 const char *filter_shlib
;
2187 const char * const *auxiliary_filters
;
2188 struct bfd_link_info
*info
;
2189 asection
**sinterpptr
;
2190 struct bfd_elf_version_tree
*verdefs
;
2192 bfd_size_type soname_indx
;
2194 struct elf_backend_data
*bed
;
2195 bfd_size_type old_dynsymcount
;
2196 struct elf_assign_sym_version_info asvinfo
;
2202 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2205 /* The backend may have to create some sections regardless of whether
2206 we're dynamic or not. */
2207 bed
= get_elf_backend_data (output_bfd
);
2208 if (bed
->elf_backend_always_size_sections
2209 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2212 dynobj
= elf_hash_table (info
)->dynobj
;
2214 /* If there were no dynamic objects in the link, there is nothing to
2219 /* If we are supposed to export all symbols into the dynamic symbol
2220 table (this is not the normal case), then do so. */
2223 struct elf_info_failed eif
;
2227 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2233 if (elf_hash_table (info
)->dynamic_sections_created
)
2235 struct elf_info_failed eif
;
2236 struct elf_link_hash_entry
*h
;
2237 bfd_size_type strsize
;
2239 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2240 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2244 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2245 soname
, true, true);
2246 if (soname_indx
== (bfd_size_type
) -1
2247 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2253 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2261 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2263 if (indx
== (bfd_size_type
) -1
2264 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2268 if (filter_shlib
!= NULL
)
2272 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2273 filter_shlib
, true, true);
2274 if (indx
== (bfd_size_type
) -1
2275 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2279 if (auxiliary_filters
!= NULL
)
2281 const char * const *p
;
2283 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2287 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2289 if (indx
== (bfd_size_type
) -1
2290 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2295 /* Attach all the symbols to their version information. */
2296 asvinfo
.output_bfd
= output_bfd
;
2297 asvinfo
.info
= info
;
2298 asvinfo
.verdefs
= verdefs
;
2299 asvinfo
.export_dynamic
= export_dynamic
;
2300 asvinfo
.removed_dynamic
= false;
2301 asvinfo
.failed
= false;
2303 elf_link_hash_traverse (elf_hash_table (info
),
2304 elf_link_assign_sym_version
,
2309 /* Find all symbols which were defined in a dynamic object and make
2310 the backend pick a reasonable value for them. */
2313 elf_link_hash_traverse (elf_hash_table (info
),
2314 elf_adjust_dynamic_symbol
,
2319 /* Add some entries to the .dynamic section. We fill in some of the
2320 values later, in elf_bfd_final_link, but we must add the entries
2321 now so that we know the final size of the .dynamic section. */
2322 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2325 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2326 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2328 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2331 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2334 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2335 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2337 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2340 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2341 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2342 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2343 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2344 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2345 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2346 sizeof (Elf_External_Sym
)))
2350 /* The backend must work out the sizes of all the other dynamic
2352 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2353 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2356 if (elf_hash_table (info
)->dynamic_sections_created
)
2361 size_t bucketcount
= 0;
2362 Elf_Internal_Sym isym
;
2364 /* Set up the version definition section. */
2365 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2366 BFD_ASSERT (s
!= NULL
);
2368 /* We may have created additional version definitions if we are
2369 just linking a regular application. */
2370 verdefs
= asvinfo
.verdefs
;
2372 if (verdefs
== NULL
)
2376 /* Don't include this section in the output file. */
2377 for (spp
= &output_bfd
->sections
;
2378 *spp
!= s
->output_section
;
2379 spp
= &(*spp
)->next
)
2381 *spp
= s
->output_section
->next
;
2382 --output_bfd
->section_count
;
2388 struct bfd_elf_version_tree
*t
;
2390 Elf_Internal_Verdef def
;
2391 Elf_Internal_Verdaux defaux
;
2393 if (asvinfo
.removed_dynamic
)
2395 /* Some dynamic symbols were changed to be local
2396 symbols. In this case, we renumber all of the
2397 dynamic symbols, so that we don't have a hole. If
2398 the backend changed dynsymcount, then assume that the
2399 new symbols are at the start. This is the case on
2400 the MIPS. FIXME: The names of the removed symbols
2401 will still be in the dynamic string table, wasting
2403 elf_hash_table (info
)->dynsymcount
=
2404 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2405 elf_link_hash_traverse (elf_hash_table (info
),
2406 elf_link_renumber_dynsyms
,
2413 /* Make space for the base version. */
2414 size
+= sizeof (Elf_External_Verdef
);
2415 size
+= sizeof (Elf_External_Verdaux
);
2418 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2420 struct bfd_elf_version_deps
*n
;
2422 size
+= sizeof (Elf_External_Verdef
);
2423 size
+= sizeof (Elf_External_Verdaux
);
2426 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2427 size
+= sizeof (Elf_External_Verdaux
);
2430 s
->_raw_size
= size
;
2431 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2432 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2435 /* Fill in the version definition section. */
2439 def
.vd_version
= VER_DEF_CURRENT
;
2440 def
.vd_flags
= VER_FLG_BASE
;
2443 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2444 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2445 + sizeof (Elf_External_Verdaux
));
2447 if (soname_indx
!= -1)
2449 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2450 defaux
.vda_name
= soname_indx
;
2457 name
= output_bfd
->filename
;
2458 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2459 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2461 if (indx
== (bfd_size_type
) -1)
2463 defaux
.vda_name
= indx
;
2465 defaux
.vda_next
= 0;
2467 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2468 (Elf_External_Verdef
*)p
);
2469 p
+= sizeof (Elf_External_Verdef
);
2470 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2471 (Elf_External_Verdaux
*) p
);
2472 p
+= sizeof (Elf_External_Verdaux
);
2474 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2477 struct bfd_elf_version_deps
*n
;
2478 struct elf_link_hash_entry
*h
;
2481 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2484 /* Add a symbol representing this version. */
2486 if (! (_bfd_generic_link_add_one_symbol
2487 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2488 (bfd_vma
) 0, (const char *) NULL
, false,
2489 get_elf_backend_data (dynobj
)->collect
,
2490 (struct bfd_link_hash_entry
**) &h
)))
2492 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2493 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2494 h
->type
= STT_OBJECT
;
2495 h
->verinfo
.vertree
= t
;
2497 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2500 def
.vd_version
= VER_DEF_CURRENT
;
2502 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2503 def
.vd_flags
|= VER_FLG_WEAK
;
2504 def
.vd_ndx
= t
->vernum
+ 1;
2505 def
.vd_cnt
= cdeps
+ 1;
2506 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2507 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2508 if (t
->next
!= NULL
)
2509 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2510 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2514 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2515 (Elf_External_Verdef
*) p
);
2516 p
+= sizeof (Elf_External_Verdef
);
2518 defaux
.vda_name
= h
->dynstr_index
;
2519 if (t
->deps
== NULL
)
2520 defaux
.vda_next
= 0;
2522 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2523 t
->name_indx
= defaux
.vda_name
;
2525 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2526 (Elf_External_Verdaux
*) p
);
2527 p
+= sizeof (Elf_External_Verdaux
);
2529 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2531 defaux
.vda_name
= n
->version_needed
->name_indx
;
2532 if (n
->next
== NULL
)
2533 defaux
.vda_next
= 0;
2535 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2537 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2538 (Elf_External_Verdaux
*) p
);
2539 p
+= sizeof (Elf_External_Verdaux
);
2543 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2544 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2547 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2550 /* Work out the size of the version reference section. */
2552 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2553 BFD_ASSERT (s
!= NULL
);
2555 struct elf_find_verdep_info sinfo
;
2557 sinfo
.output_bfd
= output_bfd
;
2559 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2560 if (sinfo
.vers
== 0)
2562 sinfo
.failed
= false;
2564 elf_link_hash_traverse (elf_hash_table (info
),
2565 elf_link_find_version_dependencies
,
2568 if (elf_tdata (output_bfd
)->verref
== NULL
)
2572 /* We don't have any version definitions, so we can just
2573 remove the section. */
2575 for (spp
= &output_bfd
->sections
;
2576 *spp
!= s
->output_section
;
2577 spp
= &(*spp
)->next
)
2579 *spp
= s
->output_section
->next
;
2580 --output_bfd
->section_count
;
2584 Elf_Internal_Verneed
*t
;
2589 /* Build the version definition section. */
2592 for (t
= elf_tdata (output_bfd
)->verref
;
2596 Elf_Internal_Vernaux
*a
;
2598 size
+= sizeof (Elf_External_Verneed
);
2600 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2601 size
+= sizeof (Elf_External_Vernaux
);
2604 s
->_raw_size
= size
;
2605 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2606 if (s
->contents
== NULL
)
2610 for (t
= elf_tdata (output_bfd
)->verref
;
2615 Elf_Internal_Vernaux
*a
;
2619 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2622 t
->vn_version
= VER_NEED_CURRENT
;
2624 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2625 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2626 elf_dt_name (t
->vn_bfd
),
2629 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2630 t
->vn_bfd
->filename
, true, false);
2631 if (indx
== (bfd_size_type
) -1)
2634 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2635 if (t
->vn_nextref
== NULL
)
2638 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2639 + caux
* sizeof (Elf_External_Vernaux
));
2641 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2642 (Elf_External_Verneed
*) p
);
2643 p
+= sizeof (Elf_External_Verneed
);
2645 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2647 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2649 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2650 a
->vna_nodename
, true, false);
2651 if (indx
== (bfd_size_type
) -1)
2654 if (a
->vna_nextptr
== NULL
)
2657 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2659 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2660 (Elf_External_Vernaux
*) p
);
2661 p
+= sizeof (Elf_External_Vernaux
);
2665 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2666 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2669 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2673 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2675 /* Work out the size of the symbol version section. */
2676 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2677 BFD_ASSERT (s
!= NULL
);
2678 if (dynsymcount
== 0
2679 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2683 /* We don't need any symbol versions; just discard the
2685 for (spp
= &output_bfd
->sections
;
2686 *spp
!= s
->output_section
;
2687 spp
= &(*spp
)->next
)
2689 *spp
= s
->output_section
->next
;
2690 --output_bfd
->section_count
;
2694 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2695 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2696 if (s
->contents
== NULL
)
2699 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2703 /* Set the size of the .dynsym and .hash sections. We counted
2704 the number of dynamic symbols in elf_link_add_object_symbols.
2705 We will build the contents of .dynsym and .hash when we build
2706 the final symbol table, because until then we do not know the
2707 correct value to give the symbols. We built the .dynstr
2708 section as we went along in elf_link_add_object_symbols. */
2709 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2710 BFD_ASSERT (s
!= NULL
);
2711 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2712 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2713 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2716 /* The first entry in .dynsym is a dummy symbol. */
2723 elf_swap_symbol_out (output_bfd
, &isym
,
2724 (PTR
) (Elf_External_Sym
*) s
->contents
);
2726 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2728 bucketcount
= elf_buckets
[i
];
2729 if (dynsymcount
< elf_buckets
[i
+ 1])
2733 s
= bfd_get_section_by_name (dynobj
, ".hash");
2734 BFD_ASSERT (s
!= NULL
);
2735 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2736 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2737 if (s
->contents
== NULL
)
2739 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2741 put_word (output_bfd
, bucketcount
, s
->contents
);
2742 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2744 elf_hash_table (info
)->bucketcount
= bucketcount
;
2746 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2747 BFD_ASSERT (s
!= NULL
);
2748 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2750 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2757 /* Fix up the flags for a symbol. This handles various cases which
2758 can only be fixed after all the input files are seen. This is
2759 currently called by both adjust_dynamic_symbol and
2760 assign_sym_version, which is unnecessary but perhaps more robust in
2761 the face of future changes. */
2764 elf_fix_symbol_flags (h
, eif
)
2765 struct elf_link_hash_entry
*h
;
2766 struct elf_info_failed
*eif
;
2768 /* If this symbol was mentioned in a non-ELF file, try to set
2769 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2770 permit a non-ELF file to correctly refer to a symbol defined in
2771 an ELF dynamic object. */
2772 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2774 if (h
->root
.type
!= bfd_link_hash_defined
2775 && h
->root
.type
!= bfd_link_hash_defweak
)
2776 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2779 if (h
->root
.u
.def
.section
->owner
!= NULL
2780 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2781 == bfd_target_elf_flavour
))
2782 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2784 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2787 if (h
->dynindx
== -1
2788 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2789 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2791 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2799 /* If this is a final link, and the symbol was defined as a common
2800 symbol in a regular object file, and there was no definition in
2801 any dynamic object, then the linker will have allocated space for
2802 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2803 flag will not have been set. */
2804 if (h
->root
.type
== bfd_link_hash_defined
2805 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2806 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2807 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2808 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2809 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2811 /* If -Bsymbolic was used (which means to bind references to global
2812 symbols to the definition within the shared object), and this
2813 symbol was defined in a regular object, then it actually doesn't
2814 need a PLT entry. */
2815 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2816 && eif
->info
->shared
2817 && eif
->info
->symbolic
2818 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2819 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2824 /* Make the backend pick a good value for a dynamic symbol. This is
2825 called via elf_link_hash_traverse, and also calls itself
2829 elf_adjust_dynamic_symbol (h
, data
)
2830 struct elf_link_hash_entry
*h
;
2833 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2835 struct elf_backend_data
*bed
;
2837 /* Ignore indirect symbols. These are added by the versioning code. */
2838 if (h
->root
.type
== bfd_link_hash_indirect
)
2841 /* Fix the symbol flags. */
2842 if (! elf_fix_symbol_flags (h
, eif
))
2845 /* If this symbol does not require a PLT entry, and it is not
2846 defined by a dynamic object, or is not referenced by a regular
2847 object, ignore it. We do have to handle a weak defined symbol,
2848 even if no regular object refers to it, if we decided to add it
2849 to the dynamic symbol table. FIXME: Do we normally need to worry
2850 about symbols which are defined by one dynamic object and
2851 referenced by another one? */
2852 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2853 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2854 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2855 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2856 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2859 /* If we've already adjusted this symbol, don't do it again. This
2860 can happen via a recursive call. */
2861 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2864 /* Don't look at this symbol again. Note that we must set this
2865 after checking the above conditions, because we may look at a
2866 symbol once, decide not to do anything, and then get called
2867 recursively later after REF_REGULAR is set below. */
2868 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2870 /* If this is a weak definition, and we know a real definition, and
2871 the real symbol is not itself defined by a regular object file,
2872 then get a good value for the real definition. We handle the
2873 real symbol first, for the convenience of the backend routine.
2875 Note that there is a confusing case here. If the real definition
2876 is defined by a regular object file, we don't get the real symbol
2877 from the dynamic object, but we do get the weak symbol. If the
2878 processor backend uses a COPY reloc, then if some routine in the
2879 dynamic object changes the real symbol, we will not see that
2880 change in the corresponding weak symbol. This is the way other
2881 ELF linkers work as well, and seems to be a result of the shared
2884 I will clarify this issue. Most SVR4 shared libraries define the
2885 variable _timezone and define timezone as a weak synonym. The
2886 tzset call changes _timezone. If you write
2887 extern int timezone;
2889 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2890 you might expect that, since timezone is a synonym for _timezone,
2891 the same number will print both times. However, if the processor
2892 backend uses a COPY reloc, then actually timezone will be copied
2893 into your process image, and, since you define _timezone
2894 yourself, _timezone will not. Thus timezone and _timezone will
2895 wind up at different memory locations. The tzset call will set
2896 _timezone, leaving timezone unchanged. */
2898 if (h
->weakdef
!= NULL
)
2900 struct elf_link_hash_entry
*weakdef
;
2902 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2903 || h
->root
.type
== bfd_link_hash_defweak
);
2904 weakdef
= h
->weakdef
;
2905 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2906 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2907 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2908 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2910 /* This symbol is defined by a regular object file, so we
2911 will not do anything special. Clear weakdef for the
2912 convenience of the processor backend. */
2917 /* There is an implicit reference by a regular object file
2918 via the weak symbol. */
2919 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2920 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2925 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2926 bed
= get_elf_backend_data (dynobj
);
2927 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2936 /* This routine is used to export all defined symbols into the dynamic
2937 symbol table. It is called via elf_link_hash_traverse. */
2940 elf_export_symbol (h
, data
)
2941 struct elf_link_hash_entry
*h
;
2944 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2946 /* Ignore indirect symbols. These are added by the versioning code. */
2947 if (h
->root
.type
== bfd_link_hash_indirect
)
2950 if (h
->dynindx
== -1
2951 && (h
->elf_link_hash_flags
2952 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2954 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2964 /* Look through the symbols which are defined in other shared
2965 libraries and referenced here. Update the list of version
2966 dependencies. This will be put into the .gnu.version_r section.
2967 This function is called via elf_link_hash_traverse. */
2970 elf_link_find_version_dependencies (h
, data
)
2971 struct elf_link_hash_entry
*h
;
2974 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2975 Elf_Internal_Verneed
*t
;
2976 Elf_Internal_Vernaux
*a
;
2978 /* We only care about symbols defined in shared objects with version
2980 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2981 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2983 || h
->verinfo
.verdef
== NULL
)
2986 /* See if we already know about this version. */
2987 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
2989 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2992 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2993 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2999 /* This is a new version. Add it to tree we are building. */
3003 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3006 rinfo
->failed
= true;
3010 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3011 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3012 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3015 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3017 /* Note that we are copying a string pointer here, and testing it
3018 above. If bfd_elf_string_from_elf_section is ever changed to
3019 discard the string data when low in memory, this will have to be
3021 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3023 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3024 a
->vna_nextptr
= t
->vn_auxptr
;
3026 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3029 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3036 /* Figure out appropriate versions for all the symbols. We may not
3037 have the version number script until we have read all of the input
3038 files, so until that point we don't know which symbols should be
3039 local. This function is called via elf_link_hash_traverse. */
3042 elf_link_assign_sym_version (h
, data
)
3043 struct elf_link_hash_entry
*h
;
3046 struct elf_assign_sym_version_info
*sinfo
=
3047 (struct elf_assign_sym_version_info
*) data
;
3048 struct bfd_link_info
*info
= sinfo
->info
;
3049 struct elf_info_failed eif
;
3052 /* Fix the symbol flags. */
3055 if (! elf_fix_symbol_flags (h
, &eif
))
3058 sinfo
->failed
= true;
3062 /* We only need version numbers for symbols defined in regular
3064 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3067 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3068 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3070 struct bfd_elf_version_tree
*t
;
3075 /* There are two consecutive ELF_VER_CHR characters if this is
3076 not a hidden symbol. */
3078 if (*p
== ELF_VER_CHR
)
3084 /* If there is no version string, we can just return out. */
3088 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3092 /* Look for the version. If we find it, it is no longer weak. */
3093 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3095 if (strcmp (t
->name
, p
) == 0)
3097 h
->verinfo
.vertree
= t
;
3100 /* See if there is anything to force this symbol to
3102 if (t
->locals
!= NULL
)
3106 struct bfd_elf_version_expr
*d
;
3108 len
= p
- h
->root
.root
.string
;
3109 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3112 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3113 alc
[len
- 1] = '\0';
3114 if (alc
[len
- 2] == ELF_VER_CHR
)
3115 alc
[len
- 2] = '\0';
3117 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3119 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3120 || fnmatch (d
->match
, alc
, 0) == 0)
3122 if (h
->dynindx
!= -1
3124 && ! sinfo
->export_dynamic
)
3126 sinfo
->removed_dynamic
= true;
3127 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3128 h
->elf_link_hash_flags
&=~
3129 ELF_LINK_HASH_NEEDS_PLT
;
3131 /* FIXME: The name of the symbol has
3132 already been recorded in the dynamic
3133 string table section. */
3140 bfd_release (sinfo
->output_bfd
, alc
);
3147 /* If we are building an application, we need to create a
3148 version node for this version. */
3149 if (t
== NULL
&& ! info
->shared
)
3151 struct bfd_elf_version_tree
**pp
;
3154 /* If we aren't going to export this symbol, we don't need
3155 to worry about it. */
3156 if (h
->dynindx
== -1)
3159 t
= ((struct bfd_elf_version_tree
*)
3160 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3163 sinfo
->failed
= true;
3172 t
->name_indx
= (unsigned int) -1;
3176 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3178 t
->vernum
= version_index
;
3182 h
->verinfo
.vertree
= t
;
3186 /* We could not find the version for a symbol when
3187 generating a shared archive. Return an error. */
3188 (*_bfd_error_handler
)
3189 ("%s: undefined version name %s",
3190 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3191 bfd_set_error (bfd_error_bad_value
);
3192 sinfo
->failed
= true;
3197 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3200 /* If we don't have a version for this symbol, see if we can find
3202 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3204 struct bfd_elf_version_tree
*t
;
3205 struct bfd_elf_version_tree
*deflt
;
3206 struct bfd_elf_version_expr
*d
;
3208 /* See if can find what version this symbol is in. If the
3209 symbol is supposed to be local, then don't actually register
3212 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3214 if (t
->globals
!= NULL
)
3216 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3218 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3220 h
->verinfo
.vertree
= t
;
3229 if (t
->locals
!= NULL
)
3231 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3233 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3235 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3237 h
->verinfo
.vertree
= t
;
3238 if (h
->dynindx
!= -1
3240 && ! sinfo
->export_dynamic
)
3242 sinfo
->removed_dynamic
= true;
3243 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3244 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3246 /* FIXME: The name of the symbol has already
3247 been recorded in the dynamic string table
3259 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3261 h
->verinfo
.vertree
= deflt
;
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 been
3271 recorded in the dynamic string table section. */
3279 /* This function is used to renumber the dynamic symbols, if some of
3280 them are removed because they are marked as local. This is called
3281 via elf_link_hash_traverse. */
3284 elf_link_renumber_dynsyms (h
, data
)
3285 struct elf_link_hash_entry
*h
;
3288 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3290 if (h
->dynindx
!= -1)
3292 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3293 ++elf_hash_table (info
)->dynsymcount
;
3299 /* Final phase of ELF linker. */
3301 /* A structure we use to avoid passing large numbers of arguments. */
3303 struct elf_final_link_info
3305 /* General link information. */
3306 struct bfd_link_info
*info
;
3309 /* Symbol string table. */
3310 struct bfd_strtab_hash
*symstrtab
;
3311 /* .dynsym section. */
3312 asection
*dynsym_sec
;
3313 /* .hash section. */
3315 /* symbol version section (.gnu.version). */
3316 asection
*symver_sec
;
3317 /* Buffer large enough to hold contents of any section. */
3319 /* Buffer large enough to hold external relocs of any section. */
3320 PTR external_relocs
;
3321 /* Buffer large enough to hold internal relocs of any section. */
3322 Elf_Internal_Rela
*internal_relocs
;
3323 /* Buffer large enough to hold external local symbols of any input
3325 Elf_External_Sym
*external_syms
;
3326 /* Buffer large enough to hold internal local symbols of any input
3328 Elf_Internal_Sym
*internal_syms
;
3329 /* Array large enough to hold a symbol index for each local symbol
3330 of any input BFD. */
3332 /* Array large enough to hold a section pointer for each local
3333 symbol of any input BFD. */
3334 asection
**sections
;
3335 /* Buffer to hold swapped out symbols. */
3336 Elf_External_Sym
*symbuf
;
3337 /* Number of swapped out symbols in buffer. */
3338 size_t symbuf_count
;
3339 /* Number of symbols which fit in symbuf. */
3343 static boolean elf_link_output_sym
3344 PARAMS ((struct elf_final_link_info
*, const char *,
3345 Elf_Internal_Sym
*, asection
*));
3346 static boolean elf_link_flush_output_syms
3347 PARAMS ((struct elf_final_link_info
*));
3348 static boolean elf_link_output_extsym
3349 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3350 static boolean elf_link_input_bfd
3351 PARAMS ((struct elf_final_link_info
*, bfd
*));
3352 static boolean elf_reloc_link_order
3353 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3354 struct bfd_link_order
*));
3356 /* This struct is used to pass information to elf_link_output_extsym. */
3358 struct elf_outext_info
3362 struct elf_final_link_info
*finfo
;
3365 /* Do the final step of an ELF link. */
3368 elf_bfd_final_link (abfd
, info
)
3370 struct bfd_link_info
*info
;
3374 struct elf_final_link_info finfo
;
3375 register asection
*o
;
3376 register struct bfd_link_order
*p
;
3378 size_t max_contents_size
;
3379 size_t max_external_reloc_size
;
3380 size_t max_internal_reloc_count
;
3381 size_t max_sym_count
;
3383 Elf_Internal_Sym elfsym
;
3385 Elf_Internal_Shdr
*symtab_hdr
;
3386 Elf_Internal_Shdr
*symstrtab_hdr
;
3387 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3388 struct elf_outext_info eoinfo
;
3391 abfd
->flags
|= DYNAMIC
;
3393 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3394 dynobj
= elf_hash_table (info
)->dynobj
;
3397 finfo
.output_bfd
= abfd
;
3398 finfo
.symstrtab
= elf_stringtab_init ();
3399 if (finfo
.symstrtab
== NULL
)
3404 finfo
.dynsym_sec
= NULL
;
3405 finfo
.hash_sec
= NULL
;
3406 finfo
.symver_sec
= NULL
;
3410 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3411 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3412 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3413 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3414 /* Note that it is OK if symver_sec is NULL. */
3417 finfo
.contents
= NULL
;
3418 finfo
.external_relocs
= NULL
;
3419 finfo
.internal_relocs
= NULL
;
3420 finfo
.external_syms
= NULL
;
3421 finfo
.internal_syms
= NULL
;
3422 finfo
.indices
= NULL
;
3423 finfo
.sections
= NULL
;
3424 finfo
.symbuf
= NULL
;
3425 finfo
.symbuf_count
= 0;
3427 /* Count up the number of relocations we will output for each output
3428 section, so that we know the sizes of the reloc sections. We
3429 also figure out some maximum sizes. */
3430 max_contents_size
= 0;
3431 max_external_reloc_size
= 0;
3432 max_internal_reloc_count
= 0;
3434 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3438 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3440 if (p
->type
== bfd_section_reloc_link_order
3441 || p
->type
== bfd_symbol_reloc_link_order
)
3443 else if (p
->type
== bfd_indirect_link_order
)
3447 sec
= p
->u
.indirect
.section
;
3449 /* Mark all sections which are to be included in the
3450 link. This will normally be every section. We need
3451 to do this so that we can identify any sections which
3452 the linker has decided to not include. */
3453 sec
->linker_mark
= true;
3455 if (info
->relocateable
)
3456 o
->reloc_count
+= sec
->reloc_count
;
3458 if (sec
->_raw_size
> max_contents_size
)
3459 max_contents_size
= sec
->_raw_size
;
3460 if (sec
->_cooked_size
> max_contents_size
)
3461 max_contents_size
= sec
->_cooked_size
;
3463 /* We are interested in just local symbols, not all
3465 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3466 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3470 if (elf_bad_symtab (sec
->owner
))
3471 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3472 / sizeof (Elf_External_Sym
));
3474 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3476 if (sym_count
> max_sym_count
)
3477 max_sym_count
= sym_count
;
3479 if ((sec
->flags
& SEC_RELOC
) != 0)
3483 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3484 if (ext_size
> max_external_reloc_size
)
3485 max_external_reloc_size
= ext_size
;
3486 if (sec
->reloc_count
> max_internal_reloc_count
)
3487 max_internal_reloc_count
= sec
->reloc_count
;
3493 if (o
->reloc_count
> 0)
3494 o
->flags
|= SEC_RELOC
;
3497 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3498 set it (this is probably a bug) and if it is set
3499 assign_section_numbers will create a reloc section. */
3500 o
->flags
&=~ SEC_RELOC
;
3503 /* If the SEC_ALLOC flag is not set, force the section VMA to
3504 zero. This is done in elf_fake_sections as well, but forcing
3505 the VMA to 0 here will ensure that relocs against these
3506 sections are handled correctly. */
3507 if ((o
->flags
& SEC_ALLOC
) == 0
3508 && ! o
->user_set_vma
)
3512 /* Figure out the file positions for everything but the symbol table
3513 and the relocs. We set symcount to force assign_section_numbers
3514 to create a symbol table. */
3515 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3516 BFD_ASSERT (! abfd
->output_has_begun
);
3517 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3520 /* That created the reloc sections. Set their sizes, and assign
3521 them file positions, and allocate some buffers. */
3522 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3524 if ((o
->flags
& SEC_RELOC
) != 0)
3526 Elf_Internal_Shdr
*rel_hdr
;
3527 register struct elf_link_hash_entry
**p
, **pend
;
3529 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3531 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3533 /* The contents field must last into write_object_contents,
3534 so we allocate it with bfd_alloc rather than malloc. */
3535 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3536 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3539 p
= ((struct elf_link_hash_entry
**)
3540 bfd_malloc (o
->reloc_count
3541 * sizeof (struct elf_link_hash_entry
*)));
3542 if (p
== NULL
&& o
->reloc_count
!= 0)
3544 elf_section_data (o
)->rel_hashes
= p
;
3545 pend
= p
+ o
->reloc_count
;
3546 for (; p
< pend
; p
++)
3549 /* Use the reloc_count field as an index when outputting the
3555 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3557 /* We have now assigned file positions for all the sections except
3558 .symtab and .strtab. We start the .symtab section at the current
3559 file position, and write directly to it. We build the .strtab
3560 section in memory. */
3562 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3563 /* sh_name is set in prep_headers. */
3564 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3565 symtab_hdr
->sh_flags
= 0;
3566 symtab_hdr
->sh_addr
= 0;
3567 symtab_hdr
->sh_size
= 0;
3568 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3569 /* sh_link is set in assign_section_numbers. */
3570 /* sh_info is set below. */
3571 /* sh_offset is set just below. */
3572 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3574 off
= elf_tdata (abfd
)->next_file_pos
;
3575 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3577 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3578 incorrect. We do not yet know the size of the .symtab section.
3579 We correct next_file_pos below, after we do know the size. */
3581 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3582 continuously seeking to the right position in the file. */
3583 if (! info
->keep_memory
|| max_sym_count
< 20)
3584 finfo
.symbuf_size
= 20;
3586 finfo
.symbuf_size
= max_sym_count
;
3587 finfo
.symbuf
= ((Elf_External_Sym
*)
3588 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3589 if (finfo
.symbuf
== NULL
)
3592 /* Start writing out the symbol table. The first symbol is always a
3594 if (info
->strip
!= strip_all
|| info
->relocateable
)
3596 elfsym
.st_value
= 0;
3599 elfsym
.st_other
= 0;
3600 elfsym
.st_shndx
= SHN_UNDEF
;
3601 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3602 &elfsym
, bfd_und_section_ptr
))
3607 /* Some standard ELF linkers do this, but we don't because it causes
3608 bootstrap comparison failures. */
3609 /* Output a file symbol for the output file as the second symbol.
3610 We output this even if we are discarding local symbols, although
3611 I'm not sure if this is correct. */
3612 elfsym
.st_value
= 0;
3614 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3615 elfsym
.st_other
= 0;
3616 elfsym
.st_shndx
= SHN_ABS
;
3617 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3618 &elfsym
, bfd_abs_section_ptr
))
3622 /* Output a symbol for each section. We output these even if we are
3623 discarding local symbols, since they are used for relocs. These
3624 symbols have no names. We store the index of each one in the
3625 index field of the section, so that we can find it again when
3626 outputting relocs. */
3627 if (info
->strip
!= strip_all
|| info
->relocateable
)
3630 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3631 elfsym
.st_other
= 0;
3632 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3634 o
= section_from_elf_index (abfd
, i
);
3636 o
->target_index
= abfd
->symcount
;
3637 elfsym
.st_shndx
= i
;
3638 if (info
->relocateable
|| o
== NULL
)
3639 elfsym
.st_value
= 0;
3641 elfsym
.st_value
= o
->vma
;
3642 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3648 /* Allocate some memory to hold information read in from the input
3650 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3651 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3652 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3653 bfd_malloc (max_internal_reloc_count
3654 * sizeof (Elf_Internal_Rela
)));
3655 finfo
.external_syms
= ((Elf_External_Sym
*)
3656 bfd_malloc (max_sym_count
3657 * sizeof (Elf_External_Sym
)));
3658 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3659 bfd_malloc (max_sym_count
3660 * sizeof (Elf_Internal_Sym
)));
3661 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3662 finfo
.sections
= ((asection
**)
3663 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3664 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3665 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3666 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3667 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3668 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3669 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3670 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3673 /* Since ELF permits relocations to be against local symbols, we
3674 must have the local symbols available when we do the relocations.
3675 Since we would rather only read the local symbols once, and we
3676 would rather not keep them in memory, we handle all the
3677 relocations for a single input file at the same time.
3679 Unfortunately, there is no way to know the total number of local
3680 symbols until we have seen all of them, and the local symbol
3681 indices precede the global symbol indices. This means that when
3682 we are generating relocateable output, and we see a reloc against
3683 a global symbol, we can not know the symbol index until we have
3684 finished examining all the local symbols to see which ones we are
3685 going to output. To deal with this, we keep the relocations in
3686 memory, and don't output them until the end of the link. This is
3687 an unfortunate waste of memory, but I don't see a good way around
3688 it. Fortunately, it only happens when performing a relocateable
3689 link, which is not the common case. FIXME: If keep_memory is set
3690 we could write the relocs out and then read them again; I don't
3691 know how bad the memory loss will be. */
3693 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3694 sub
->output_has_begun
= false;
3695 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3697 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3699 if (p
->type
== bfd_indirect_link_order
3700 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3701 == bfd_target_elf_flavour
))
3703 sub
= p
->u
.indirect
.section
->owner
;
3704 if (! sub
->output_has_begun
)
3706 if (! elf_link_input_bfd (&finfo
, sub
))
3708 sub
->output_has_begun
= true;
3711 else if (p
->type
== bfd_section_reloc_link_order
3712 || p
->type
== bfd_symbol_reloc_link_order
)
3714 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3719 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3725 /* That wrote out all the local symbols. Finish up the symbol table
3726 with the global symbols. */
3728 if (info
->strip
!= strip_all
&& info
->shared
)
3730 /* Output any global symbols that got converted to local in a
3731 version script. We do this in a separate step since ELF
3732 requires all local symbols to appear prior to any global
3733 symbols. FIXME: We should only do this if some global
3734 symbols were, in fact, converted to become local. FIXME:
3735 Will this work correctly with the Irix 5 linker? */
3736 eoinfo
.failed
= false;
3737 eoinfo
.finfo
= &finfo
;
3738 eoinfo
.localsyms
= true;
3739 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3745 /* The sh_info field records the index of the first non local
3747 symtab_hdr
->sh_info
= abfd
->symcount
;
3749 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3751 /* We get the global symbols from the hash table. */
3752 eoinfo
.failed
= false;
3753 eoinfo
.localsyms
= false;
3754 eoinfo
.finfo
= &finfo
;
3755 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3760 /* Flush all symbols to the file. */
3761 if (! elf_link_flush_output_syms (&finfo
))
3764 /* Now we know the size of the symtab section. */
3765 off
+= symtab_hdr
->sh_size
;
3767 /* Finish up and write out the symbol string table (.strtab)
3769 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3770 /* sh_name was set in prep_headers. */
3771 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3772 symstrtab_hdr
->sh_flags
= 0;
3773 symstrtab_hdr
->sh_addr
= 0;
3774 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3775 symstrtab_hdr
->sh_entsize
= 0;
3776 symstrtab_hdr
->sh_link
= 0;
3777 symstrtab_hdr
->sh_info
= 0;
3778 /* sh_offset is set just below. */
3779 symstrtab_hdr
->sh_addralign
= 1;
3781 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3782 elf_tdata (abfd
)->next_file_pos
= off
;
3784 if (abfd
->symcount
> 0)
3786 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3787 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3791 /* Adjust the relocs to have the correct symbol indices. */
3792 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3794 struct elf_link_hash_entry
**rel_hash
;
3795 Elf_Internal_Shdr
*rel_hdr
;
3797 if ((o
->flags
& SEC_RELOC
) == 0)
3800 rel_hash
= elf_section_data (o
)->rel_hashes
;
3801 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3802 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3804 if (*rel_hash
== NULL
)
3807 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3809 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3811 Elf_External_Rel
*erel
;
3812 Elf_Internal_Rel irel
;
3814 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3815 elf_swap_reloc_in (abfd
, erel
, &irel
);
3816 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3817 ELF_R_TYPE (irel
.r_info
));
3818 elf_swap_reloc_out (abfd
, &irel
, erel
);
3822 Elf_External_Rela
*erela
;
3823 Elf_Internal_Rela irela
;
3825 BFD_ASSERT (rel_hdr
->sh_entsize
3826 == sizeof (Elf_External_Rela
));
3828 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3829 elf_swap_reloca_in (abfd
, erela
, &irela
);
3830 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3831 ELF_R_TYPE (irela
.r_info
));
3832 elf_swap_reloca_out (abfd
, &irela
, erela
);
3836 /* Set the reloc_count field to 0 to prevent write_relocs from
3837 trying to swap the relocs out itself. */
3841 /* If we are linking against a dynamic object, or generating a
3842 shared library, finish up the dynamic linking information. */
3845 Elf_External_Dyn
*dyncon
, *dynconend
;
3847 /* Fix up .dynamic entries. */
3848 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3849 BFD_ASSERT (o
!= NULL
);
3851 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3852 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3853 for (; dyncon
< dynconend
; dyncon
++)
3855 Elf_Internal_Dyn dyn
;
3859 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3866 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3867 magic _init and _fini symbols. This is pretty ugly,
3868 but we are compatible. */
3876 struct elf_link_hash_entry
*h
;
3878 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3879 false, false, true);
3881 && (h
->root
.type
== bfd_link_hash_defined
3882 || h
->root
.type
== bfd_link_hash_defweak
))
3884 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3885 o
= h
->root
.u
.def
.section
;
3886 if (o
->output_section
!= NULL
)
3887 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3888 + o
->output_offset
);
3891 /* The symbol is imported from another shared
3892 library and does not apply to this one. */
3896 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3911 name
= ".gnu.version_d";
3914 name
= ".gnu.version_r";
3917 name
= ".gnu.version";
3919 o
= bfd_get_section_by_name (abfd
, name
);
3920 BFD_ASSERT (o
!= NULL
);
3921 dyn
.d_un
.d_ptr
= o
->vma
;
3922 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3929 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3934 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3936 Elf_Internal_Shdr
*hdr
;
3938 hdr
= elf_elfsections (abfd
)[i
];
3939 if (hdr
->sh_type
== type
3940 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3942 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3943 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3946 if (dyn
.d_un
.d_val
== 0
3947 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3948 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3952 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3958 /* If we have created any dynamic sections, then output them. */
3961 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3964 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3966 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3967 || o
->_raw_size
== 0)
3969 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3971 /* At this point, we are only interested in sections
3972 created by elf_link_create_dynamic_sections. */
3975 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3977 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3979 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3980 o
->contents
, o
->output_offset
,
3988 /* The contents of the .dynstr section are actually in a
3990 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
3991 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
3992 || ! _bfd_stringtab_emit (abfd
,
3993 elf_hash_table (info
)->dynstr
))
3999 /* If we have optimized stabs strings, output them. */
4000 if (elf_hash_table (info
)->stab_info
!= NULL
)
4002 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4006 if (finfo
.symstrtab
!= NULL
)
4007 _bfd_stringtab_free (finfo
.symstrtab
);
4008 if (finfo
.contents
!= NULL
)
4009 free (finfo
.contents
);
4010 if (finfo
.external_relocs
!= NULL
)
4011 free (finfo
.external_relocs
);
4012 if (finfo
.internal_relocs
!= NULL
)
4013 free (finfo
.internal_relocs
);
4014 if (finfo
.external_syms
!= NULL
)
4015 free (finfo
.external_syms
);
4016 if (finfo
.internal_syms
!= NULL
)
4017 free (finfo
.internal_syms
);
4018 if (finfo
.indices
!= NULL
)
4019 free (finfo
.indices
);
4020 if (finfo
.sections
!= NULL
)
4021 free (finfo
.sections
);
4022 if (finfo
.symbuf
!= NULL
)
4023 free (finfo
.symbuf
);
4024 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4026 if ((o
->flags
& SEC_RELOC
) != 0
4027 && elf_section_data (o
)->rel_hashes
!= NULL
)
4028 free (elf_section_data (o
)->rel_hashes
);
4031 elf_tdata (abfd
)->linker
= true;
4036 if (finfo
.symstrtab
!= NULL
)
4037 _bfd_stringtab_free (finfo
.symstrtab
);
4038 if (finfo
.contents
!= NULL
)
4039 free (finfo
.contents
);
4040 if (finfo
.external_relocs
!= NULL
)
4041 free (finfo
.external_relocs
);
4042 if (finfo
.internal_relocs
!= NULL
)
4043 free (finfo
.internal_relocs
);
4044 if (finfo
.external_syms
!= NULL
)
4045 free (finfo
.external_syms
);
4046 if (finfo
.internal_syms
!= NULL
)
4047 free (finfo
.internal_syms
);
4048 if (finfo
.indices
!= NULL
)
4049 free (finfo
.indices
);
4050 if (finfo
.sections
!= NULL
)
4051 free (finfo
.sections
);
4052 if (finfo
.symbuf
!= NULL
)
4053 free (finfo
.symbuf
);
4054 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4056 if ((o
->flags
& SEC_RELOC
) != 0
4057 && elf_section_data (o
)->rel_hashes
!= NULL
)
4058 free (elf_section_data (o
)->rel_hashes
);
4064 /* Add a symbol to the output symbol table. */
4067 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4068 struct elf_final_link_info
*finfo
;
4070 Elf_Internal_Sym
*elfsym
;
4071 asection
*input_sec
;
4073 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4074 struct bfd_link_info
*info
,
4079 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4080 elf_backend_link_output_symbol_hook
;
4081 if (output_symbol_hook
!= NULL
)
4083 if (! ((*output_symbol_hook
)
4084 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4088 if (name
== (const char *) NULL
|| *name
== '\0')
4089 elfsym
->st_name
= 0;
4092 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4095 if (elfsym
->st_name
== (unsigned long) -1)
4099 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4101 if (! elf_link_flush_output_syms (finfo
))
4105 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4106 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4107 ++finfo
->symbuf_count
;
4109 ++finfo
->output_bfd
->symcount
;
4114 /* Flush the output symbols to the file. */
4117 elf_link_flush_output_syms (finfo
)
4118 struct elf_final_link_info
*finfo
;
4120 if (finfo
->symbuf_count
> 0)
4122 Elf_Internal_Shdr
*symtab
;
4124 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4126 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4128 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4129 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4130 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4133 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4135 finfo
->symbuf_count
= 0;
4141 /* Add an external symbol to the symbol table. This is called from
4142 the hash table traversal routine. When generating a shared object,
4143 we go through the symbol table twice. The first time we output
4144 anything that might have been forced to local scope in a version
4145 script. The second time we output the symbols that are still
4149 elf_link_output_extsym (h
, data
)
4150 struct elf_link_hash_entry
*h
;
4153 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4154 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4156 Elf_Internal_Sym sym
;
4157 asection
*input_sec
;
4159 /* Decide whether to output this symbol in this pass. */
4160 if (eoinfo
->localsyms
)
4162 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4167 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4171 /* If we are not creating a shared library, and this symbol is
4172 referenced by a shared library but is not defined anywhere, then
4173 warn that it is undefined. If we do not do this, the runtime
4174 linker will complain that the symbol is undefined when the
4175 program is run. We don't have to worry about symbols that are
4176 referenced by regular files, because we will already have issued
4177 warnings for them. */
4178 if (! finfo
->info
->relocateable
4179 && ! finfo
->info
->shared
4180 && h
->root
.type
== bfd_link_hash_undefined
4181 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4182 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4184 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4185 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4186 (asection
*) NULL
, 0)))
4188 eoinfo
->failed
= true;
4193 /* We don't want to output symbols that have never been mentioned by
4194 a regular file, or that we have been told to strip. However, if
4195 h->indx is set to -2, the symbol is used by a reloc and we must
4199 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4200 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4201 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4202 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4204 else if (finfo
->info
->strip
== strip_all
4205 || (finfo
->info
->strip
== strip_some
4206 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4207 h
->root
.root
.string
,
4208 false, false) == NULL
))
4213 /* If we're stripping it, and it's not a dynamic symbol, there's
4214 nothing else to do. */
4215 if (strip
&& h
->dynindx
== -1)
4219 sym
.st_size
= h
->size
;
4220 sym
.st_other
= h
->other
;
4221 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4222 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4223 else if (h
->root
.type
== bfd_link_hash_undefweak
4224 || h
->root
.type
== bfd_link_hash_defweak
)
4225 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4227 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4229 switch (h
->root
.type
)
4232 case bfd_link_hash_new
:
4236 case bfd_link_hash_undefined
:
4237 input_sec
= bfd_und_section_ptr
;
4238 sym
.st_shndx
= SHN_UNDEF
;
4241 case bfd_link_hash_undefweak
:
4242 input_sec
= bfd_und_section_ptr
;
4243 sym
.st_shndx
= SHN_UNDEF
;
4246 case bfd_link_hash_defined
:
4247 case bfd_link_hash_defweak
:
4249 input_sec
= h
->root
.u
.def
.section
;
4250 if (input_sec
->output_section
!= NULL
)
4253 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4254 input_sec
->output_section
);
4255 if (sym
.st_shndx
== (unsigned short) -1)
4257 eoinfo
->failed
= true;
4261 /* ELF symbols in relocateable files are section relative,
4262 but in nonrelocateable files they are virtual
4264 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4265 if (! finfo
->info
->relocateable
)
4266 sym
.st_value
+= input_sec
->output_section
->vma
;
4270 BFD_ASSERT (input_sec
->owner
== NULL
4271 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4272 sym
.st_shndx
= SHN_UNDEF
;
4273 input_sec
= bfd_und_section_ptr
;
4278 case bfd_link_hash_common
:
4279 input_sec
= bfd_com_section_ptr
;
4280 sym
.st_shndx
= SHN_COMMON
;
4281 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4284 case bfd_link_hash_indirect
:
4285 /* These symbols are created by symbol versioning. They point
4286 to the decorated version of the name. For example, if the
4287 symbol foo@@GNU_1.2 is the default, which should be used when
4288 foo is used with no version, then we add an indirect symbol
4289 foo which points to foo@@GNU_1.2. We ignore these symbols,
4290 since the indirected symbol is already in the hash table. If
4291 the indirect symbol is non-ELF, fall through and output it. */
4292 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4296 case bfd_link_hash_warning
:
4297 /* We can't represent these symbols in ELF, although a warning
4298 symbol may have come from a .gnu.warning.SYMBOL section. We
4299 just put the target symbol in the hash table. If the target
4300 symbol does not really exist, don't do anything. */
4301 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4303 return (elf_link_output_extsym
4304 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4307 /* Give the processor backend a chance to tweak the symbol value,
4308 and also to finish up anything that needs to be done for this
4310 if ((h
->dynindx
!= -1
4311 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4312 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4314 struct elf_backend_data
*bed
;
4316 bed
= get_elf_backend_data (finfo
->output_bfd
);
4317 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4318 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4320 eoinfo
->failed
= true;
4325 /* If this symbol should be put in the .dynsym section, then put it
4326 there now. We have already know the symbol index. We also fill
4327 in the entry in the .hash section. */
4328 if (h
->dynindx
!= -1
4329 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4335 bfd_byte
*bucketpos
;
4338 sym
.st_name
= h
->dynstr_index
;
4340 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4341 (PTR
) (((Elf_External_Sym
*)
4342 finfo
->dynsym_sec
->contents
)
4345 /* We didn't include the version string in the dynamic string
4346 table, so we must not consider it in the hash table. */
4347 name
= h
->root
.root
.string
;
4348 p
= strchr (name
, ELF_VER_CHR
);
4353 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4354 strncpy (copy
, name
, p
- name
);
4355 copy
[p
- name
] = '\0';
4359 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4360 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4361 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4362 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4363 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4364 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4365 put_word (finfo
->output_bfd
, chain
,
4366 ((bfd_byte
*) finfo
->hash_sec
->contents
4367 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4370 bfd_release (finfo
->output_bfd
, copy
);
4372 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4374 Elf_Internal_Versym iversym
;
4376 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4378 if (h
->verinfo
.verdef
== NULL
)
4379 iversym
.vs_vers
= 0;
4381 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4385 if (h
->verinfo
.vertree
== NULL
)
4386 iversym
.vs_vers
= 1;
4388 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4391 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4392 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4394 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4395 (((Elf_External_Versym
*)
4396 finfo
->symver_sec
->contents
)
4401 /* If we're stripping it, then it was just a dynamic symbol, and
4402 there's nothing else to do. */
4406 h
->indx
= finfo
->output_bfd
->symcount
;
4408 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4410 eoinfo
->failed
= true;
4417 /* Link an input file into the linker output file. This function
4418 handles all the sections and relocations of the input file at once.
4419 This is so that we only have to read the local symbols once, and
4420 don't have to keep them in memory. */
4423 elf_link_input_bfd (finfo
, input_bfd
)
4424 struct elf_final_link_info
*finfo
;
4427 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4428 bfd
*, asection
*, bfd_byte
*,
4429 Elf_Internal_Rela
*,
4430 Elf_Internal_Sym
*, asection
**));
4432 Elf_Internal_Shdr
*symtab_hdr
;
4435 Elf_External_Sym
*external_syms
;
4436 Elf_External_Sym
*esym
;
4437 Elf_External_Sym
*esymend
;
4438 Elf_Internal_Sym
*isym
;
4440 asection
**ppsection
;
4443 output_bfd
= finfo
->output_bfd
;
4445 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4447 /* If this is a dynamic object, we don't want to do anything here:
4448 we don't want the local symbols, and we don't want the section
4450 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4453 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4454 if (elf_bad_symtab (input_bfd
))
4456 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4461 locsymcount
= symtab_hdr
->sh_info
;
4462 extsymoff
= symtab_hdr
->sh_info
;
4465 /* Read the local symbols. */
4466 if (symtab_hdr
->contents
!= NULL
)
4467 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4468 else if (locsymcount
== 0)
4469 external_syms
= NULL
;
4472 external_syms
= finfo
->external_syms
;
4473 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4474 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4475 locsymcount
, input_bfd
)
4476 != locsymcount
* sizeof (Elf_External_Sym
)))
4480 /* Swap in the local symbols and write out the ones which we know
4481 are going into the output file. */
4482 esym
= external_syms
;
4483 esymend
= esym
+ locsymcount
;
4484 isym
= finfo
->internal_syms
;
4485 pindex
= finfo
->indices
;
4486 ppsection
= finfo
->sections
;
4487 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4491 Elf_Internal_Sym osym
;
4493 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4496 if (elf_bad_symtab (input_bfd
))
4498 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4505 if (isym
->st_shndx
== SHN_UNDEF
)
4506 isec
= bfd_und_section_ptr
;
4507 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4508 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4509 else if (isym
->st_shndx
== SHN_ABS
)
4510 isec
= bfd_abs_section_ptr
;
4511 else if (isym
->st_shndx
== SHN_COMMON
)
4512 isec
= bfd_com_section_ptr
;
4521 /* Don't output the first, undefined, symbol. */
4522 if (esym
== external_syms
)
4525 /* If we are stripping all symbols, we don't want to output this
4527 if (finfo
->info
->strip
== strip_all
)
4530 /* We never output section symbols. Instead, we use the section
4531 symbol of the corresponding section in the output file. */
4532 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4535 /* If we are discarding all local symbols, we don't want to
4536 output this one. If we are generating a relocateable output
4537 file, then some of the local symbols may be required by
4538 relocs; we output them below as we discover that they are
4540 if (finfo
->info
->discard
== discard_all
)
4543 /* If this symbol is defined in a section which we are
4544 discarding, we don't need to keep it, but note that
4545 linker_mark is only reliable for sections that have contents.
4546 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4547 as well as linker_mark. */
4548 if (isym
->st_shndx
> 0
4549 && isym
->st_shndx
< SHN_LORESERVE
4551 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4552 || (! finfo
->info
->relocateable
4553 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4556 /* Get the name of the symbol. */
4557 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4562 /* See if we are discarding symbols with this name. */
4563 if ((finfo
->info
->strip
== strip_some
4564 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4566 || (finfo
->info
->discard
== discard_l
4567 && bfd_is_local_label_name (input_bfd
, name
)))
4570 /* If we get here, we are going to output this symbol. */
4574 /* Adjust the section index for the output file. */
4575 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4576 isec
->output_section
);
4577 if (osym
.st_shndx
== (unsigned short) -1)
4580 *pindex
= output_bfd
->symcount
;
4582 /* ELF symbols in relocateable files are section relative, but
4583 in executable files they are virtual addresses. Note that
4584 this code assumes that all ELF sections have an associated
4585 BFD section with a reasonable value for output_offset; below
4586 we assume that they also have a reasonable value for
4587 output_section. Any special sections must be set up to meet
4588 these requirements. */
4589 osym
.st_value
+= isec
->output_offset
;
4590 if (! finfo
->info
->relocateable
)
4591 osym
.st_value
+= isec
->output_section
->vma
;
4593 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4597 /* Relocate the contents of each section. */
4598 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4602 if (! o
->linker_mark
)
4604 /* This section was omitted from the link. */
4608 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4609 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4612 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4614 /* Section was created by elf_link_create_dynamic_sections
4619 /* Get the contents of the section. They have been cached by a
4620 relaxation routine. Note that o is a section in an input
4621 file, so the contents field will not have been set by any of
4622 the routines which work on output files. */
4623 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4624 contents
= elf_section_data (o
)->this_hdr
.contents
;
4627 contents
= finfo
->contents
;
4628 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4629 (file_ptr
) 0, o
->_raw_size
))
4633 if ((o
->flags
& SEC_RELOC
) != 0)
4635 Elf_Internal_Rela
*internal_relocs
;
4637 /* Get the swapped relocs. */
4638 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4639 (input_bfd
, o
, finfo
->external_relocs
,
4640 finfo
->internal_relocs
, false));
4641 if (internal_relocs
== NULL
4642 && o
->reloc_count
> 0)
4645 /* Relocate the section by invoking a back end routine.
4647 The back end routine is responsible for adjusting the
4648 section contents as necessary, and (if using Rela relocs
4649 and generating a relocateable output file) adjusting the
4650 reloc addend as necessary.
4652 The back end routine does not have to worry about setting
4653 the reloc address or the reloc symbol index.
4655 The back end routine is given a pointer to the swapped in
4656 internal symbols, and can access the hash table entries
4657 for the external symbols via elf_sym_hashes (input_bfd).
4659 When generating relocateable output, the back end routine
4660 must handle STB_LOCAL/STT_SECTION symbols specially. The
4661 output symbol is going to be a section symbol
4662 corresponding to the output section, which will require
4663 the addend to be adjusted. */
4665 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4666 input_bfd
, o
, contents
,
4668 finfo
->internal_syms
,
4672 if (finfo
->info
->relocateable
)
4674 Elf_Internal_Rela
*irela
;
4675 Elf_Internal_Rela
*irelaend
;
4676 struct elf_link_hash_entry
**rel_hash
;
4677 Elf_Internal_Shdr
*input_rel_hdr
;
4678 Elf_Internal_Shdr
*output_rel_hdr
;
4680 /* Adjust the reloc addresses and symbol indices. */
4682 irela
= internal_relocs
;
4683 irelaend
= irela
+ o
->reloc_count
;
4684 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4685 + o
->output_section
->reloc_count
);
4686 for (; irela
< irelaend
; irela
++, rel_hash
++)
4688 unsigned long r_symndx
;
4689 Elf_Internal_Sym
*isym
;
4692 irela
->r_offset
+= o
->output_offset
;
4694 r_symndx
= ELF_R_SYM (irela
->r_info
);
4699 if (r_symndx
>= locsymcount
4700 || (elf_bad_symtab (input_bfd
)
4701 && finfo
->sections
[r_symndx
] == NULL
))
4705 /* This is a reloc against a global symbol. We
4706 have not yet output all the local symbols, so
4707 we do not know the symbol index of any global
4708 symbol. We set the rel_hash entry for this
4709 reloc to point to the global hash table entry
4710 for this symbol. The symbol index is then
4711 set at the end of elf_bfd_final_link. */
4712 indx
= r_symndx
- extsymoff
;
4713 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4715 /* Setting the index to -2 tells
4716 elf_link_output_extsym that this symbol is
4718 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4719 (*rel_hash
)->indx
= -2;
4724 /* This is a reloc against a local symbol. */
4727 isym
= finfo
->internal_syms
+ r_symndx
;
4728 sec
= finfo
->sections
[r_symndx
];
4729 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4731 /* I suppose the backend ought to fill in the
4732 section of any STT_SECTION symbol against a
4733 processor specific section. If we have
4734 discarded a section, the output_section will
4735 be the absolute section. */
4737 && (bfd_is_abs_section (sec
)
4738 || (sec
->output_section
!= NULL
4739 && bfd_is_abs_section (sec
->output_section
))))
4741 else if (sec
== NULL
|| sec
->owner
== NULL
)
4743 bfd_set_error (bfd_error_bad_value
);
4748 r_symndx
= sec
->output_section
->target_index
;
4749 BFD_ASSERT (r_symndx
!= 0);
4754 if (finfo
->indices
[r_symndx
] == -1)
4760 if (finfo
->info
->strip
== strip_all
)
4762 /* You can't do ld -r -s. */
4763 bfd_set_error (bfd_error_invalid_operation
);
4767 /* This symbol was skipped earlier, but
4768 since it is needed by a reloc, we
4769 must output it now. */
4770 link
= symtab_hdr
->sh_link
;
4771 name
= bfd_elf_string_from_elf_section (input_bfd
,
4777 osec
= sec
->output_section
;
4779 _bfd_elf_section_from_bfd_section (output_bfd
,
4781 if (isym
->st_shndx
== (unsigned short) -1)
4784 isym
->st_value
+= sec
->output_offset
;
4785 if (! finfo
->info
->relocateable
)
4786 isym
->st_value
+= osec
->vma
;
4788 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4790 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4794 r_symndx
= finfo
->indices
[r_symndx
];
4797 irela
->r_info
= ELF_R_INFO (r_symndx
,
4798 ELF_R_TYPE (irela
->r_info
));
4801 /* Swap out the relocs. */
4802 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4803 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4804 BFD_ASSERT (output_rel_hdr
->sh_entsize
4805 == input_rel_hdr
->sh_entsize
);
4806 irela
= internal_relocs
;
4807 irelaend
= irela
+ o
->reloc_count
;
4808 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4810 Elf_External_Rel
*erel
;
4812 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4813 + o
->output_section
->reloc_count
);
4814 for (; irela
< irelaend
; irela
++, erel
++)
4816 Elf_Internal_Rel irel
;
4818 irel
.r_offset
= irela
->r_offset
;
4819 irel
.r_info
= irela
->r_info
;
4820 BFD_ASSERT (irela
->r_addend
== 0);
4821 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4826 Elf_External_Rela
*erela
;
4828 BFD_ASSERT (input_rel_hdr
->sh_entsize
4829 == sizeof (Elf_External_Rela
));
4830 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4831 + o
->output_section
->reloc_count
);
4832 for (; irela
< irelaend
; irela
++, erela
++)
4833 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4836 o
->output_section
->reloc_count
+= o
->reloc_count
;
4840 /* Write out the modified section contents. */
4841 if (elf_section_data (o
)->stab_info
== NULL
)
4843 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4844 contents
, o
->output_offset
,
4845 (o
->_cooked_size
!= 0
4852 if (! (_bfd_write_section_stabs
4853 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4854 o
, &elf_section_data (o
)->stab_info
, contents
)))
4862 /* Generate a reloc when linking an ELF file. This is a reloc
4863 requested by the linker, and does come from any input file. This
4864 is used to build constructor and destructor tables when linking
4868 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4870 struct bfd_link_info
*info
;
4871 asection
*output_section
;
4872 struct bfd_link_order
*link_order
;
4874 reloc_howto_type
*howto
;
4878 struct elf_link_hash_entry
**rel_hash_ptr
;
4879 Elf_Internal_Shdr
*rel_hdr
;
4881 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4884 bfd_set_error (bfd_error_bad_value
);
4888 addend
= link_order
->u
.reloc
.p
->addend
;
4890 /* Figure out the symbol index. */
4891 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4892 + output_section
->reloc_count
);
4893 if (link_order
->type
== bfd_section_reloc_link_order
)
4895 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4896 BFD_ASSERT (indx
!= 0);
4897 *rel_hash_ptr
= NULL
;
4901 struct elf_link_hash_entry
*h
;
4903 /* Treat a reloc against a defined symbol as though it were
4904 actually against the section. */
4905 h
= ((struct elf_link_hash_entry
*)
4906 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4907 link_order
->u
.reloc
.p
->u
.name
,
4908 false, false, true));
4910 && (h
->root
.type
== bfd_link_hash_defined
4911 || h
->root
.type
== bfd_link_hash_defweak
))
4915 section
= h
->root
.u
.def
.section
;
4916 indx
= section
->output_section
->target_index
;
4917 *rel_hash_ptr
= NULL
;
4918 /* It seems that we ought to add the symbol value to the
4919 addend here, but in practice it has already been added
4920 because it was passed to constructor_callback. */
4921 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4925 /* Setting the index to -2 tells elf_link_output_extsym that
4926 this symbol is used by a reloc. */
4933 if (! ((*info
->callbacks
->unattached_reloc
)
4934 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4935 (asection
*) NULL
, (bfd_vma
) 0)))
4941 /* If this is an inplace reloc, we must write the addend into the
4943 if (howto
->partial_inplace
&& addend
!= 0)
4946 bfd_reloc_status_type rstat
;
4950 size
= bfd_get_reloc_size (howto
);
4951 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4952 if (buf
== (bfd_byte
*) NULL
)
4954 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4960 case bfd_reloc_outofrange
:
4962 case bfd_reloc_overflow
:
4963 if (! ((*info
->callbacks
->reloc_overflow
)
4965 (link_order
->type
== bfd_section_reloc_link_order
4966 ? bfd_section_name (output_bfd
,
4967 link_order
->u
.reloc
.p
->u
.section
)
4968 : link_order
->u
.reloc
.p
->u
.name
),
4969 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4977 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4978 (file_ptr
) link_order
->offset
, size
);
4984 /* The address of a reloc is relative to the section in a
4985 relocateable file, and is a virtual address in an executable
4987 offset
= link_order
->offset
;
4988 if (! info
->relocateable
)
4989 offset
+= output_section
->vma
;
4991 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4993 if (rel_hdr
->sh_type
== SHT_REL
)
4995 Elf_Internal_Rel irel
;
4996 Elf_External_Rel
*erel
;
4998 irel
.r_offset
= offset
;
4999 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5000 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5001 + output_section
->reloc_count
);
5002 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5006 Elf_Internal_Rela irela
;
5007 Elf_External_Rela
*erela
;
5009 irela
.r_offset
= offset
;
5010 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5011 irela
.r_addend
= addend
;
5012 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5013 + output_section
->reloc_count
);
5014 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5017 ++output_section
->reloc_count
;
5023 /* Allocate a pointer to live in a linker created section. */
5026 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5028 struct bfd_link_info
*info
;
5029 elf_linker_section_t
*lsect
;
5030 struct elf_link_hash_entry
*h
;
5031 const Elf_Internal_Rela
*rel
;
5033 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5034 elf_linker_section_pointers_t
*linker_section_ptr
;
5035 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5037 BFD_ASSERT (lsect
!= NULL
);
5039 /* Is this a global symbol? */
5042 /* Has this symbol already been allocated, if so, our work is done */
5043 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5048 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5049 /* Make sure this symbol is output as a dynamic symbol. */
5050 if (h
->dynindx
== -1)
5052 if (! elf_link_record_dynamic_symbol (info
, h
))
5056 if (lsect
->rel_section
)
5057 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5060 else /* Allocation of a pointer to a local symbol */
5062 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5064 /* Allocate a table to hold the local symbols if first time */
5067 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5068 register unsigned int i
;
5070 ptr
= (elf_linker_section_pointers_t
**)
5071 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5076 elf_local_ptr_offsets (abfd
) = ptr
;
5077 for (i
= 0; i
< num_symbols
; i
++)
5078 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5081 /* Has this symbol already been allocated, if so, our work is done */
5082 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5087 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5091 /* If we are generating a shared object, we need to
5092 output a R_<xxx>_RELATIVE reloc so that the
5093 dynamic linker can adjust this GOT entry. */
5094 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5095 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5099 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5100 from internal memory. */
5101 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5102 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5103 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5105 if (!linker_section_ptr
)
5108 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5109 linker_section_ptr
->addend
= rel
->r_addend
;
5110 linker_section_ptr
->which
= lsect
->which
;
5111 linker_section_ptr
->written_address_p
= false;
5112 *ptr_linker_section_ptr
= linker_section_ptr
;
5115 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5117 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5118 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5119 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5120 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5122 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5124 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5125 lsect
->sym_hash
->root
.root
.string
,
5126 (long)ARCH_SIZE
/ 8,
5127 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5133 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5135 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5138 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5139 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5147 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5150 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5153 /* Fill in the address for a pointer generated in alinker section. */
5156 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5159 struct bfd_link_info
*info
;
5160 elf_linker_section_t
*lsect
;
5161 struct elf_link_hash_entry
*h
;
5163 const Elf_Internal_Rela
*rel
;
5166 elf_linker_section_pointers_t
*linker_section_ptr
;
5168 BFD_ASSERT (lsect
!= NULL
);
5170 if (h
!= NULL
) /* global symbol */
5172 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5176 BFD_ASSERT (linker_section_ptr
!= NULL
);
5178 if (! elf_hash_table (info
)->dynamic_sections_created
5181 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5183 /* This is actually a static link, or it is a
5184 -Bsymbolic link and the symbol is defined
5185 locally. We must initialize this entry in the
5188 When doing a dynamic link, we create a .rela.<xxx>
5189 relocation entry to initialize the value. This
5190 is done in the finish_dynamic_symbol routine. */
5191 if (!linker_section_ptr
->written_address_p
)
5193 linker_section_ptr
->written_address_p
= true;
5194 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5195 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5199 else /* local symbol */
5201 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5202 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5203 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5204 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5208 BFD_ASSERT (linker_section_ptr
!= NULL
);
5210 /* Write out pointer if it hasn't been rewritten out before */
5211 if (!linker_section_ptr
->written_address_p
)
5213 linker_section_ptr
->written_address_p
= true;
5214 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5215 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5219 asection
*srel
= lsect
->rel_section
;
5220 Elf_Internal_Rela outrel
;
5222 /* We need to generate a relative reloc for the dynamic linker. */
5224 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5227 BFD_ASSERT (srel
!= NULL
);
5229 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5230 + lsect
->section
->output_offset
5231 + linker_section_ptr
->offset
);
5232 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5233 outrel
.r_addend
= 0;
5234 elf_swap_reloca_out (output_bfd
, &outrel
,
5235 (((Elf_External_Rela
*)
5236 lsect
->section
->contents
)
5237 + lsect
->section
->reloc_count
));
5238 ++lsect
->section
->reloc_count
;
5243 relocation
= (lsect
->section
->output_offset
5244 + linker_section_ptr
->offset
5245 - lsect
->hole_offset
5246 - lsect
->sym_offset
);
5249 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5250 lsect
->name
, (long)relocation
, (long)relocation
);
5253 /* Subtract out the addend, because it will get added back in by the normal
5255 return relocation
- linker_section_ptr
->addend
;