2 Copyright 1995, 1996, 1997, 1998, 1999 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
));
53 static boolean elf_collect_hash_codes
54 PARAMS ((struct elf_link_hash_entry
*, PTR
));
55 static boolean elf_link_read_relocs_from_section
56 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
57 static void elf_link_remove_section_and_adjust_dynindices
58 PARAMS ((struct bfd_link_info
*, asection
*));
60 /* Given an ELF BFD, add symbols to the global hash table as
64 elf_bfd_link_add_symbols (abfd
, info
)
66 struct bfd_link_info
*info
;
68 switch (bfd_get_format (abfd
))
71 return elf_link_add_object_symbols (abfd
, info
);
73 return elf_link_add_archive_symbols (abfd
, info
);
75 bfd_set_error (bfd_error_wrong_format
);
81 /* Add symbols from an ELF archive file to the linker hash table. We
82 don't use _bfd_generic_link_add_archive_symbols because of a
83 problem which arises on UnixWare. The UnixWare libc.so is an
84 archive which includes an entry libc.so.1 which defines a bunch of
85 symbols. The libc.so archive also includes a number of other
86 object files, which also define symbols, some of which are the same
87 as those defined in libc.so.1. Correct linking requires that we
88 consider each object file in turn, and include it if it defines any
89 symbols we need. _bfd_generic_link_add_archive_symbols does not do
90 this; it looks through the list of undefined symbols, and includes
91 any object file which defines them. When this algorithm is used on
92 UnixWare, it winds up pulling in libc.so.1 early and defining a
93 bunch of symbols. This means that some of the other objects in the
94 archive are not included in the link, which is incorrect since they
95 precede libc.so.1 in the archive.
97 Fortunately, ELF archive handling is simpler than that done by
98 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
99 oddities. In ELF, if we find a symbol in the archive map, and the
100 symbol is currently undefined, we know that we must pull in that
103 Unfortunately, we do have to make multiple passes over the symbol
104 table until nothing further is resolved. */
107 elf_link_add_archive_symbols (abfd
, info
)
109 struct bfd_link_info
*info
;
112 boolean
*defined
= NULL
;
113 boolean
*included
= NULL
;
117 if (! bfd_has_map (abfd
))
119 /* An empty archive is a special case. */
120 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
122 bfd_set_error (bfd_error_no_armap
);
126 /* Keep track of all symbols we know to be already defined, and all
127 files we know to be already included. This is to speed up the
128 second and subsequent passes. */
129 c
= bfd_ardata (abfd
)->symdef_count
;
132 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
133 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
134 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
136 memset (defined
, 0, c
* sizeof (boolean
));
137 memset (included
, 0, c
* sizeof (boolean
));
139 symdefs
= bfd_ardata (abfd
)->symdefs
;
152 symdefend
= symdef
+ c
;
153 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
155 struct elf_link_hash_entry
*h
;
157 struct bfd_link_hash_entry
*undefs_tail
;
160 if (defined
[i
] || included
[i
])
162 if (symdef
->file_offset
== last
)
168 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
169 false, false, false);
175 /* If this is a default version (the name contains @@),
176 look up the symbol again without the version. The
177 effect is that references to the symbol without the
178 version will be matched by the default symbol in the
181 p
= strchr (symdef
->name
, ELF_VER_CHR
);
182 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
185 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
188 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
189 copy
[p
- symdef
->name
] = '\0';
191 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
192 false, false, false);
194 bfd_release (abfd
, copy
);
200 if (h
->root
.type
!= bfd_link_hash_undefined
)
202 if (h
->root
.type
!= bfd_link_hash_undefweak
)
207 /* We need to include this archive member. */
209 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
210 if (element
== (bfd
*) NULL
)
213 if (! bfd_check_format (element
, bfd_object
))
216 /* Doublecheck that we have not included this object
217 already--it should be impossible, but there may be
218 something wrong with the archive. */
219 if (element
->archive_pass
!= 0)
221 bfd_set_error (bfd_error_bad_value
);
224 element
->archive_pass
= 1;
226 undefs_tail
= info
->hash
->undefs_tail
;
228 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
231 if (! elf_link_add_object_symbols (element
, info
))
234 /* If there are any new undefined symbols, we need to make
235 another pass through the archive in order to see whether
236 they can be defined. FIXME: This isn't perfect, because
237 common symbols wind up on undefs_tail and because an
238 undefined symbol which is defined later on in this pass
239 does not require another pass. This isn't a bug, but it
240 does make the code less efficient than it could be. */
241 if (undefs_tail
!= info
->hash
->undefs_tail
)
244 /* Look backward to mark all symbols from this object file
245 which we have already seen in this pass. */
249 included
[mark
] = true;
254 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
256 /* We mark subsequent symbols from this object file as we go
257 on through the loop. */
258 last
= symdef
->file_offset
;
269 if (defined
!= (boolean
*) NULL
)
271 if (included
!= (boolean
*) NULL
)
276 /* This function is called when we want to define a new symbol. It
277 handles the various cases which arise when we find a definition in
278 a dynamic object, or when there is already a definition in a
279 dynamic object. The new symbol is described by NAME, SYM, PSEC,
280 and PVALUE. We set SYM_HASH to the hash table entry. We set
281 OVERRIDE if the old symbol is overriding a new definition. We set
282 TYPE_CHANGE_OK if it is OK for the type to change. We set
283 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
284 change, we mean that we shouldn't warn if the type or size does
288 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
289 override
, type_change_ok
, size_change_ok
)
291 struct bfd_link_info
*info
;
293 Elf_Internal_Sym
*sym
;
296 struct elf_link_hash_entry
**sym_hash
;
298 boolean
*type_change_ok
;
299 boolean
*size_change_ok
;
302 struct elf_link_hash_entry
*h
;
305 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
310 bind
= ELF_ST_BIND (sym
->st_info
);
312 if (! bfd_is_und_section (sec
))
313 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
315 h
= ((struct elf_link_hash_entry
*)
316 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
321 /* This code is for coping with dynamic objects, and is only useful
322 if we are doing an ELF link. */
323 if (info
->hash
->creator
!= abfd
->xvec
)
326 /* For merging, we only care about real symbols. */
328 while (h
->root
.type
== bfd_link_hash_indirect
329 || h
->root
.type
== bfd_link_hash_warning
)
330 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
332 /* If we just created the symbol, mark it as being an ELF symbol.
333 Other than that, there is nothing to do--there is no merge issue
334 with a newly defined symbol--so we just return. */
336 if (h
->root
.type
== bfd_link_hash_new
)
338 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
342 /* OLDBFD is a BFD associated with the existing symbol. */
344 switch (h
->root
.type
)
350 case bfd_link_hash_undefined
:
351 case bfd_link_hash_undefweak
:
352 oldbfd
= h
->root
.u
.undef
.abfd
;
355 case bfd_link_hash_defined
:
356 case bfd_link_hash_defweak
:
357 oldbfd
= h
->root
.u
.def
.section
->owner
;
360 case bfd_link_hash_common
:
361 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
365 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
366 respectively, is from a dynamic object. */
368 if ((abfd
->flags
& DYNAMIC
) != 0)
373 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
378 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
379 respectively, appear to be a definition rather than reference. */
381 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
386 if (h
->root
.type
== bfd_link_hash_undefined
387 || h
->root
.type
== bfd_link_hash_undefweak
388 || h
->root
.type
== bfd_link_hash_common
)
393 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
394 symbol, respectively, appears to be a common symbol in a dynamic
395 object. If a symbol appears in an uninitialized section, and is
396 not weak, and is not a function, then it may be a common symbol
397 which was resolved when the dynamic object was created. We want
398 to treat such symbols specially, because they raise special
399 considerations when setting the symbol size: if the symbol
400 appears as a common symbol in a regular object, and the size in
401 the regular object is larger, we must make sure that we use the
402 larger size. This problematic case can always be avoided in C,
403 but it must be handled correctly when using Fortran shared
406 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
407 likewise for OLDDYNCOMMON and OLDDEF.
409 Note that this test is just a heuristic, and that it is quite
410 possible to have an uninitialized symbol in a shared object which
411 is really a definition, rather than a common symbol. This could
412 lead to some minor confusion when the symbol really is a common
413 symbol in some regular object. However, I think it will be
418 && (sec
->flags
& SEC_ALLOC
) != 0
419 && (sec
->flags
& SEC_LOAD
) == 0
422 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
425 newdyncommon
= false;
429 && h
->root
.type
== bfd_link_hash_defined
430 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
431 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
432 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
434 && h
->type
!= STT_FUNC
)
437 olddyncommon
= false;
439 /* It's OK to change the type if either the existing symbol or the
440 new symbol is weak. */
442 if (h
->root
.type
== bfd_link_hash_defweak
443 || h
->root
.type
== bfd_link_hash_undefweak
445 *type_change_ok
= true;
447 /* It's OK to change the size if either the existing symbol or the
448 new symbol is weak, or if the old symbol is undefined. */
451 || h
->root
.type
== bfd_link_hash_undefined
)
452 *size_change_ok
= true;
454 /* If both the old and the new symbols look like common symbols in a
455 dynamic object, set the size of the symbol to the larger of the
460 && sym
->st_size
!= h
->size
)
462 /* Since we think we have two common symbols, issue a multiple
463 common warning if desired. Note that we only warn if the
464 size is different. If the size is the same, we simply let
465 the old symbol override the new one as normally happens with
466 symbols defined in dynamic objects. */
468 if (! ((*info
->callbacks
->multiple_common
)
469 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
470 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
473 if (sym
->st_size
> h
->size
)
474 h
->size
= sym
->st_size
;
476 *size_change_ok
= true;
479 /* If we are looking at a dynamic object, and we have found a
480 definition, we need to see if the symbol was already defined by
481 some other object. If so, we want to use the existing
482 definition, and we do not want to report a multiple symbol
483 definition error; we do this by clobbering *PSEC to be
486 We treat a common symbol as a definition if the symbol in the
487 shared library is a function, since common symbols always
488 represent variables; this can cause confusion in principle, but
489 any such confusion would seem to indicate an erroneous program or
490 shared library. We also permit a common symbol in a regular
491 object to override a weak symbol in a shared object. */
496 || (h
->root
.type
== bfd_link_hash_common
498 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
502 newdyncommon
= false;
504 *psec
= sec
= bfd_und_section_ptr
;
505 *size_change_ok
= true;
507 /* If we get here when the old symbol is a common symbol, then
508 we are explicitly letting it override a weak symbol or
509 function in a dynamic object, and we don't want to warn about
510 a type change. If the old symbol is a defined symbol, a type
511 change warning may still be appropriate. */
513 if (h
->root
.type
== bfd_link_hash_common
)
514 *type_change_ok
= true;
517 /* Handle the special case of an old common symbol merging with a
518 new symbol which looks like a common symbol in a shared object.
519 We change *PSEC and *PVALUE to make the new symbol look like a
520 common symbol, and let _bfd_generic_link_add_one_symbol will do
524 && h
->root
.type
== bfd_link_hash_common
)
528 newdyncommon
= false;
529 *pvalue
= sym
->st_size
;
530 *psec
= sec
= bfd_com_section_ptr
;
531 *size_change_ok
= true;
534 /* If the old symbol is from a dynamic object, and the new symbol is
535 a definition which is not from a dynamic object, then the new
536 symbol overrides the old symbol. Symbols from regular files
537 always take precedence over symbols from dynamic objects, even if
538 they are defined after the dynamic object in the link.
540 As above, we again permit a common symbol in a regular object to
541 override a definition in a shared object if the shared object
542 symbol is a function or is weak. */
546 || (bfd_is_com_section (sec
)
547 && (h
->root
.type
== bfd_link_hash_defweak
548 || h
->type
== STT_FUNC
)))
551 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
553 /* Change the hash table entry to undefined, and let
554 _bfd_generic_link_add_one_symbol do the right thing with the
557 h
->root
.type
= bfd_link_hash_undefined
;
558 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
559 *size_change_ok
= true;
562 olddyncommon
= false;
564 /* We again permit a type change when a common symbol may be
565 overriding a function. */
567 if (bfd_is_com_section (sec
))
568 *type_change_ok
= true;
570 /* This union may have been set to be non-NULL when this symbol
571 was seen in a dynamic object. We must force the union to be
572 NULL, so that it is correct for a regular symbol. */
574 h
->verinfo
.vertree
= NULL
;
576 /* In this special case, if H is the target of an indirection,
577 we want the caller to frob with H rather than with the
578 indirect symbol. That will permit the caller to redefine the
579 target of the indirection, rather than the indirect symbol
580 itself. FIXME: This will break the -y option if we store a
581 symbol with a different name. */
585 /* Handle the special case of a new common symbol merging with an
586 old symbol that looks like it might be a common symbol defined in
587 a shared object. Note that we have already handled the case in
588 which a new common symbol should simply override the definition
589 in the shared library. */
592 && bfd_is_com_section (sec
)
595 /* It would be best if we could set the hash table entry to a
596 common symbol, but we don't know what to use for the section
598 if (! ((*info
->callbacks
->multiple_common
)
599 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
600 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
603 /* If the predumed common symbol in the dynamic object is
604 larger, pretend that the new symbol has its size. */
606 if (h
->size
> *pvalue
)
609 /* FIXME: We no longer know the alignment required by the symbol
610 in the dynamic object, so we just wind up using the one from
611 the regular object. */
614 olddyncommon
= false;
616 h
->root
.type
= bfd_link_hash_undefined
;
617 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
619 *size_change_ok
= true;
620 *type_change_ok
= true;
622 h
->verinfo
.vertree
= NULL
;
628 /* Add symbols from an ELF object file to the linker hash table. */
631 elf_link_add_object_symbols (abfd
, info
)
633 struct bfd_link_info
*info
;
635 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
636 const Elf_Internal_Sym
*,
637 const char **, flagword
*,
638 asection
**, bfd_vma
*));
639 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
640 asection
*, const Elf_Internal_Rela
*));
642 Elf_Internal_Shdr
*hdr
;
646 Elf_External_Sym
*buf
= NULL
;
647 struct elf_link_hash_entry
**sym_hash
;
649 bfd_byte
*dynver
= NULL
;
650 Elf_External_Versym
*extversym
= NULL
;
651 Elf_External_Versym
*ever
;
652 Elf_External_Dyn
*dynbuf
= NULL
;
653 struct elf_link_hash_entry
*weaks
;
654 Elf_External_Sym
*esym
;
655 Elf_External_Sym
*esymend
;
657 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
658 collect
= get_elf_backend_data (abfd
)->collect
;
660 if ((abfd
->flags
& DYNAMIC
) == 0)
666 /* You can't use -r against a dynamic object. Also, there's no
667 hope of using a dynamic object which does not exactly match
668 the format of the output file. */
669 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
671 bfd_set_error (bfd_error_invalid_operation
);
676 /* As a GNU extension, any input sections which are named
677 .gnu.warning.SYMBOL are treated as warning symbols for the given
678 symbol. This differs from .gnu.warning sections, which generate
679 warnings when they are included in an output file. */
684 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
688 name
= bfd_get_section_name (abfd
, s
);
689 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
694 name
+= sizeof ".gnu.warning." - 1;
696 /* If this is a shared object, then look up the symbol
697 in the hash table. If it is there, and it is already
698 been defined, then we will not be using the entry
699 from this shared object, so we don't need to warn.
700 FIXME: If we see the definition in a regular object
701 later on, we will warn, but we shouldn't. The only
702 fix is to keep track of what warnings we are supposed
703 to emit, and then handle them all at the end of the
705 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
707 struct elf_link_hash_entry
*h
;
709 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
712 /* FIXME: What about bfd_link_hash_common? */
714 && (h
->root
.type
== bfd_link_hash_defined
715 || h
->root
.type
== bfd_link_hash_defweak
))
717 /* We don't want to issue this warning. Clobber
718 the section size so that the warning does not
719 get copied into the output file. */
725 sz
= bfd_section_size (abfd
, s
);
726 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
730 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
735 if (! (_bfd_generic_link_add_one_symbol
736 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
737 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
740 if (! info
->relocateable
)
742 /* Clobber the section size so that the warning does
743 not get copied into the output file. */
750 /* If this is a dynamic object, we always link against the .dynsym
751 symbol table, not the .symtab symbol table. The dynamic linker
752 will only see the .dynsym symbol table, so there is no reason to
753 look at .symtab for a dynamic object. */
755 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
756 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
758 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
762 /* Read in any version definitions. */
764 if (! _bfd_elf_slurp_version_tables (abfd
))
767 /* Read in the symbol versions, but don't bother to convert them
768 to internal format. */
769 if (elf_dynversym (abfd
) != 0)
771 Elf_Internal_Shdr
*versymhdr
;
773 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
774 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
775 if (extversym
== NULL
)
777 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
778 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
779 != versymhdr
->sh_size
))
784 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
786 /* The sh_info field of the symtab header tells us where the
787 external symbols start. We don't care about the local symbols at
789 if (elf_bad_symtab (abfd
))
791 extsymcount
= symcount
;
796 extsymcount
= symcount
- hdr
->sh_info
;
797 extsymoff
= hdr
->sh_info
;
800 buf
= ((Elf_External_Sym
*)
801 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
802 if (buf
== NULL
&& extsymcount
!= 0)
805 /* We store a pointer to the hash table entry for each external
807 sym_hash
= ((struct elf_link_hash_entry
**)
809 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
810 if (sym_hash
== NULL
)
812 elf_sym_hashes (abfd
) = sym_hash
;
816 /* If we are creating a shared library, create all the dynamic
817 sections immediately. We need to attach them to something,
818 so we attach them to this BFD, provided it is the right
819 format. FIXME: If there are no input BFD's of the same
820 format as the output, we can't make a shared library. */
822 && ! elf_hash_table (info
)->dynamic_sections_created
823 && abfd
->xvec
== info
->hash
->creator
)
825 if (! elf_link_create_dynamic_sections (abfd
, info
))
834 bfd_size_type oldsize
;
835 bfd_size_type strindex
;
837 /* Find the name to use in a DT_NEEDED entry that refers to this
838 object. If the object has a DT_SONAME entry, we use it.
839 Otherwise, if the generic linker stuck something in
840 elf_dt_name, we use that. Otherwise, we just use the file
841 name. If the generic linker put a null string into
842 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
843 there is a DT_SONAME entry. */
845 name
= bfd_get_filename (abfd
);
846 if (elf_dt_name (abfd
) != NULL
)
848 name
= elf_dt_name (abfd
);
852 s
= bfd_get_section_by_name (abfd
, ".dynamic");
855 Elf_External_Dyn
*extdyn
;
856 Elf_External_Dyn
*extdynend
;
860 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
864 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
865 (file_ptr
) 0, s
->_raw_size
))
868 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
871 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
874 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
875 for (; extdyn
< extdynend
; extdyn
++)
877 Elf_Internal_Dyn dyn
;
879 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
880 if (dyn
.d_tag
== DT_SONAME
)
882 name
= bfd_elf_string_from_elf_section (abfd
, link
,
887 if (dyn
.d_tag
== DT_NEEDED
)
889 struct bfd_link_needed_list
*n
, **pn
;
892 n
= ((struct bfd_link_needed_list
*)
893 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
894 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
896 if (n
== NULL
|| fnm
== NULL
)
898 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
905 for (pn
= &elf_hash_table (info
)->needed
;
917 /* We do not want to include any of the sections in a dynamic
918 object in the output file. We hack by simply clobbering the
919 list of sections in the BFD. This could be handled more
920 cleanly by, say, a new section flag; the existing
921 SEC_NEVER_LOAD flag is not the one we want, because that one
922 still implies that the section takes up space in the output
924 abfd
->sections
= NULL
;
925 abfd
->section_count
= 0;
927 /* If this is the first dynamic object found in the link, create
928 the special sections required for dynamic linking. */
929 if (! elf_hash_table (info
)->dynamic_sections_created
)
931 if (! elf_link_create_dynamic_sections (abfd
, info
))
937 /* Add a DT_NEEDED entry for this dynamic object. */
938 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
939 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
941 if (strindex
== (bfd_size_type
) -1)
944 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
947 Elf_External_Dyn
*dyncon
, *dynconend
;
949 /* The hash table size did not change, which means that
950 the dynamic object name was already entered. If we
951 have already included this dynamic object in the
952 link, just ignore it. There is no reason to include
953 a particular dynamic object more than once. */
954 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
956 BFD_ASSERT (sdyn
!= NULL
);
958 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
959 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
961 for (; dyncon
< dynconend
; dyncon
++)
963 Elf_Internal_Dyn dyn
;
965 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
967 if (dyn
.d_tag
== DT_NEEDED
968 && dyn
.d_un
.d_val
== strindex
)
972 if (extversym
!= NULL
)
979 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
983 /* Save the SONAME, if there is one, because sometimes the
984 linker emulation code will need to know it. */
986 name
= bfd_get_filename (abfd
);
987 elf_dt_name (abfd
) = name
;
991 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
993 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
994 != extsymcount
* sizeof (Elf_External_Sym
)))
999 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1000 esymend
= buf
+ extsymcount
;
1003 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1005 Elf_Internal_Sym sym
;
1011 struct elf_link_hash_entry
*h
;
1013 boolean size_change_ok
, type_change_ok
;
1014 boolean new_weakdef
;
1015 unsigned int old_alignment
;
1017 elf_swap_symbol_in (abfd
, esym
, &sym
);
1019 flags
= BSF_NO_FLAGS
;
1021 value
= sym
.st_value
;
1024 bind
= ELF_ST_BIND (sym
.st_info
);
1025 if (bind
== STB_LOCAL
)
1027 /* This should be impossible, since ELF requires that all
1028 global symbols follow all local symbols, and that sh_info
1029 point to the first global symbol. Unfortunatealy, Irix 5
1033 else if (bind
== STB_GLOBAL
)
1035 if (sym
.st_shndx
!= SHN_UNDEF
1036 && sym
.st_shndx
!= SHN_COMMON
)
1041 else if (bind
== STB_WEAK
)
1045 /* Leave it up to the processor backend. */
1048 if (sym
.st_shndx
== SHN_UNDEF
)
1049 sec
= bfd_und_section_ptr
;
1050 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1052 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1054 sec
= bfd_abs_section_ptr
;
1055 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1058 else if (sym
.st_shndx
== SHN_ABS
)
1059 sec
= bfd_abs_section_ptr
;
1060 else if (sym
.st_shndx
== SHN_COMMON
)
1062 sec
= bfd_com_section_ptr
;
1063 /* What ELF calls the size we call the value. What ELF
1064 calls the value we call the alignment. */
1065 value
= sym
.st_size
;
1069 /* Leave it up to the processor backend. */
1072 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1073 if (name
== (const char *) NULL
)
1076 if (add_symbol_hook
)
1078 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1082 /* The hook function sets the name to NULL if this symbol
1083 should be skipped for some reason. */
1084 if (name
== (const char *) NULL
)
1088 /* Sanity check that all possibilities were handled. */
1089 if (sec
== (asection
*) NULL
)
1091 bfd_set_error (bfd_error_bad_value
);
1095 if (bfd_is_und_section (sec
)
1096 || bfd_is_com_section (sec
))
1101 size_change_ok
= false;
1102 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1104 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1106 Elf_Internal_Versym iver
;
1107 unsigned int vernum
= 0;
1112 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1113 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1115 /* If this is a hidden symbol, or if it is not version
1116 1, we append the version name to the symbol name.
1117 However, we do not modify a non-hidden absolute
1118 symbol, because it might be the version symbol
1119 itself. FIXME: What if it isn't? */
1120 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1121 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1124 int namelen
, newlen
;
1127 if (sym
.st_shndx
!= SHN_UNDEF
)
1129 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1131 (*_bfd_error_handler
)
1132 (_("%s: %s: invalid version %u (max %d)"),
1133 bfd_get_filename (abfd
), name
, vernum
,
1134 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1135 bfd_set_error (bfd_error_bad_value
);
1138 else if (vernum
> 1)
1140 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1146 /* We cannot simply test for the number of
1147 entries in the VERNEED section since the
1148 numbers for the needed versions do not start
1150 Elf_Internal_Verneed
*t
;
1153 for (t
= elf_tdata (abfd
)->verref
;
1157 Elf_Internal_Vernaux
*a
;
1159 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1161 if (a
->vna_other
== vernum
)
1163 verstr
= a
->vna_nodename
;
1172 (*_bfd_error_handler
)
1173 (_("%s: %s: invalid needed version %d"),
1174 bfd_get_filename (abfd
), name
, vernum
);
1175 bfd_set_error (bfd_error_bad_value
);
1180 namelen
= strlen (name
);
1181 newlen
= namelen
+ strlen (verstr
) + 2;
1182 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1185 newname
= (char *) bfd_alloc (abfd
, newlen
);
1186 if (newname
== NULL
)
1188 strcpy (newname
, name
);
1189 p
= newname
+ namelen
;
1191 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1199 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1200 sym_hash
, &override
, &type_change_ok
,
1208 while (h
->root
.type
== bfd_link_hash_indirect
1209 || h
->root
.type
== bfd_link_hash_warning
)
1210 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1212 /* Remember the old alignment if this is a common symbol, so
1213 that we don't reduce the alignment later on. We can't
1214 check later, because _bfd_generic_link_add_one_symbol
1215 will set a default for the alignment which we want to
1217 if (h
->root
.type
== bfd_link_hash_common
)
1218 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1220 if (elf_tdata (abfd
)->verdef
!= NULL
1224 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1227 if (! (_bfd_generic_link_add_one_symbol
1228 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1229 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1233 while (h
->root
.type
== bfd_link_hash_indirect
1234 || h
->root
.type
== bfd_link_hash_warning
)
1235 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1238 new_weakdef
= false;
1241 && (flags
& BSF_WEAK
) != 0
1242 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1243 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1244 && h
->weakdef
== NULL
)
1246 /* Keep a list of all weak defined non function symbols from
1247 a dynamic object, using the weakdef field. Later in this
1248 function we will set the weakdef field to the correct
1249 value. We only put non-function symbols from dynamic
1250 objects on this list, because that happens to be the only
1251 time we need to know the normal symbol corresponding to a
1252 weak symbol, and the information is time consuming to
1253 figure out. If the weakdef field is not already NULL,
1254 then this symbol was already defined by some previous
1255 dynamic object, and we will be using that previous
1256 definition anyhow. */
1263 /* Set the alignment of a common symbol. */
1264 if (sym
.st_shndx
== SHN_COMMON
1265 && h
->root
.type
== bfd_link_hash_common
)
1269 align
= bfd_log2 (sym
.st_value
);
1270 if (align
> old_alignment
)
1271 h
->root
.u
.c
.p
->alignment_power
= align
;
1274 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1280 /* Remember the symbol size and type. */
1281 if (sym
.st_size
!= 0
1282 && (definition
|| h
->size
== 0))
1284 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1285 (*_bfd_error_handler
)
1286 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1287 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1288 bfd_get_filename (abfd
));
1290 h
->size
= sym
.st_size
;
1293 /* If this is a common symbol, then we always want H->SIZE
1294 to be the size of the common symbol. The code just above
1295 won't fix the size if a common symbol becomes larger. We
1296 don't warn about a size change here, because that is
1297 covered by --warn-common. */
1298 if (h
->root
.type
== bfd_link_hash_common
)
1299 h
->size
= h
->root
.u
.c
.size
;
1301 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1302 && (definition
|| h
->type
== STT_NOTYPE
))
1304 if (h
->type
!= STT_NOTYPE
1305 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1306 && ! type_change_ok
)
1307 (*_bfd_error_handler
)
1308 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1309 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1310 bfd_get_filename (abfd
));
1312 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1315 if (sym
.st_other
!= 0
1316 && (definition
|| h
->other
== 0))
1317 h
->other
= sym
.st_other
;
1319 /* Set a flag in the hash table entry indicating the type of
1320 reference or definition we just found. Keep a count of
1321 the number of dynamic symbols we find. A dynamic symbol
1322 is one which is referenced or defined by both a regular
1323 object and a shared object. */
1324 old_flags
= h
->elf_link_hash_flags
;
1330 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1331 if (bind
!= STB_WEAK
)
1332 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1335 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1337 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1338 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1344 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1346 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1347 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1348 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1349 || (h
->weakdef
!= NULL
1351 && h
->weakdef
->dynindx
!= -1))
1355 h
->elf_link_hash_flags
|= new_flag
;
1357 /* If this symbol has a version, and it is the default
1358 version, we create an indirect symbol from the default
1359 name to the fully decorated name. This will cause
1360 external references which do not specify a version to be
1361 bound to this version of the symbol. */
1366 p
= strchr (name
, ELF_VER_CHR
);
1367 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1370 struct elf_link_hash_entry
*hi
;
1373 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1375 if (shortname
== NULL
)
1377 strncpy (shortname
, name
, p
- name
);
1378 shortname
[p
- name
] = '\0';
1380 /* We are going to create a new symbol. Merge it
1381 with any existing symbol with this name. For the
1382 purposes of the merge, act as though we were
1383 defining the symbol we just defined, although we
1384 actually going to define an indirect symbol. */
1385 type_change_ok
= false;
1386 size_change_ok
= false;
1387 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1388 &value
, &hi
, &override
,
1389 &type_change_ok
, &size_change_ok
))
1394 if (! (_bfd_generic_link_add_one_symbol
1395 (info
, abfd
, shortname
, BSF_INDIRECT
,
1396 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1397 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1402 /* In this case the symbol named SHORTNAME is
1403 overriding the indirect symbol we want to
1404 add. We were planning on making SHORTNAME an
1405 indirect symbol referring to NAME. SHORTNAME
1406 is the name without a version. NAME is the
1407 fully versioned name, and it is the default
1410 Overriding means that we already saw a
1411 definition for the symbol SHORTNAME in a
1412 regular object, and it is overriding the
1413 symbol defined in the dynamic object.
1415 When this happens, we actually want to change
1416 NAME, the symbol we just added, to refer to
1417 SHORTNAME. This will cause references to
1418 NAME in the shared object to become
1419 references to SHORTNAME in the regular
1420 object. This is what we expect when we
1421 override a function in a shared object: that
1422 the references in the shared object will be
1423 mapped to the definition in the regular
1426 while (hi
->root
.type
== bfd_link_hash_indirect
1427 || hi
->root
.type
== bfd_link_hash_warning
)
1428 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1430 h
->root
.type
= bfd_link_hash_indirect
;
1431 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1432 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1434 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1435 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1436 if (hi
->elf_link_hash_flags
1437 & (ELF_LINK_HASH_REF_REGULAR
1438 | ELF_LINK_HASH_DEF_REGULAR
))
1440 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1446 /* Now set HI to H, so that the following code
1447 will set the other fields correctly. */
1451 /* If there is a duplicate definition somewhere,
1452 then HI may not point to an indirect symbol. We
1453 will have reported an error to the user in that
1456 if (hi
->root
.type
== bfd_link_hash_indirect
)
1458 struct elf_link_hash_entry
*ht
;
1460 /* If the symbol became indirect, then we assume
1461 that we have not seen a definition before. */
1462 BFD_ASSERT ((hi
->elf_link_hash_flags
1463 & (ELF_LINK_HASH_DEF_DYNAMIC
1464 | ELF_LINK_HASH_DEF_REGULAR
))
1467 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1469 /* Copy down any references that we may have
1470 already seen to the symbol which just became
1472 ht
->elf_link_hash_flags
|=
1473 (hi
->elf_link_hash_flags
1474 & (ELF_LINK_HASH_REF_DYNAMIC
1475 | ELF_LINK_HASH_REF_REGULAR
1476 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1478 /* Copy over the global and procedure linkage table
1479 offset entries. These may have been already set
1480 up by a check_relocs routine. */
1481 if (ht
->got
.offset
== (bfd_vma
) -1)
1483 ht
->got
.offset
= hi
->got
.offset
;
1484 hi
->got
.offset
= (bfd_vma
) -1;
1486 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1488 if (ht
->plt
.offset
== (bfd_vma
) -1)
1490 ht
->plt
.offset
= hi
->plt
.offset
;
1491 hi
->plt
.offset
= (bfd_vma
) -1;
1493 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1495 if (ht
->dynindx
== -1)
1497 ht
->dynindx
= hi
->dynindx
;
1498 ht
->dynstr_index
= hi
->dynstr_index
;
1500 hi
->dynstr_index
= 0;
1502 BFD_ASSERT (hi
->dynindx
== -1);
1504 /* FIXME: There may be other information to copy
1505 over for particular targets. */
1507 /* See if the new flags lead us to realize that
1508 the symbol must be dynamic. */
1514 || ((hi
->elf_link_hash_flags
1515 & ELF_LINK_HASH_REF_DYNAMIC
)
1521 if ((hi
->elf_link_hash_flags
1522 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1528 /* We also need to define an indirection from the
1529 nondefault version of the symbol. */
1531 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1533 if (shortname
== NULL
)
1535 strncpy (shortname
, name
, p
- name
);
1536 strcpy (shortname
+ (p
- name
), p
+ 1);
1538 /* Once again, merge with any existing symbol. */
1539 type_change_ok
= false;
1540 size_change_ok
= false;
1541 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1542 &value
, &hi
, &override
,
1543 &type_change_ok
, &size_change_ok
))
1548 /* Here SHORTNAME is a versioned name, so we
1549 don't expect to see the type of override we
1550 do in the case above. */
1551 (*_bfd_error_handler
)
1552 (_("%s: warning: unexpected redefinition of `%s'"),
1553 bfd_get_filename (abfd
), shortname
);
1557 if (! (_bfd_generic_link_add_one_symbol
1558 (info
, abfd
, shortname
, BSF_INDIRECT
,
1559 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1560 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1563 /* If there is a duplicate definition somewhere,
1564 then HI may not point to an indirect symbol.
1565 We will have reported an error to the user in
1568 if (hi
->root
.type
== bfd_link_hash_indirect
)
1570 /* If the symbol became indirect, then we
1571 assume that we have not seen a definition
1573 BFD_ASSERT ((hi
->elf_link_hash_flags
1574 & (ELF_LINK_HASH_DEF_DYNAMIC
1575 | ELF_LINK_HASH_DEF_REGULAR
))
1578 /* Copy down any references that we may have
1579 already seen to the symbol which just
1581 h
->elf_link_hash_flags
|=
1582 (hi
->elf_link_hash_flags
1583 & (ELF_LINK_HASH_REF_DYNAMIC
1584 | ELF_LINK_HASH_REF_REGULAR
1585 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1587 /* Copy over the global and procedure linkage
1588 table offset entries. These may have been
1589 already set up by a check_relocs routine. */
1590 if (h
->got
.offset
== (bfd_vma
) -1)
1592 h
->got
.offset
= hi
->got
.offset
;
1593 hi
->got
.offset
= (bfd_vma
) -1;
1595 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1597 if (h
->plt
.offset
== (bfd_vma
) -1)
1599 h
->plt
.offset
= hi
->plt
.offset
;
1600 hi
->plt
.offset
= (bfd_vma
) -1;
1602 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1604 if (h
->dynindx
== -1)
1606 h
->dynindx
= hi
->dynindx
;
1607 h
->dynstr_index
= hi
->dynstr_index
;
1609 hi
->dynstr_index
= 0;
1611 BFD_ASSERT (hi
->dynindx
== -1);
1613 /* FIXME: There may be other information to
1614 copy over for particular targets. */
1616 /* See if the new flags lead us to realize
1617 that the symbol must be dynamic. */
1623 || ((hi
->elf_link_hash_flags
1624 & ELF_LINK_HASH_REF_DYNAMIC
)
1630 if ((hi
->elf_link_hash_flags
1631 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1640 if (dynsym
&& h
->dynindx
== -1)
1642 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1644 if (h
->weakdef
!= NULL
1646 && h
->weakdef
->dynindx
== -1)
1648 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1656 /* Now set the weakdefs field correctly for all the weak defined
1657 symbols we found. The only way to do this is to search all the
1658 symbols. Since we only need the information for non functions in
1659 dynamic objects, that's the only time we actually put anything on
1660 the list WEAKS. We need this information so that if a regular
1661 object refers to a symbol defined weakly in a dynamic object, the
1662 real symbol in the dynamic object is also put in the dynamic
1663 symbols; we also must arrange for both symbols to point to the
1664 same memory location. We could handle the general case of symbol
1665 aliasing, but a general symbol alias can only be generated in
1666 assembler code, handling it correctly would be very time
1667 consuming, and other ELF linkers don't handle general aliasing
1669 while (weaks
!= NULL
)
1671 struct elf_link_hash_entry
*hlook
;
1674 struct elf_link_hash_entry
**hpp
;
1675 struct elf_link_hash_entry
**hppend
;
1678 weaks
= hlook
->weakdef
;
1679 hlook
->weakdef
= NULL
;
1681 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1682 || hlook
->root
.type
== bfd_link_hash_defweak
1683 || hlook
->root
.type
== bfd_link_hash_common
1684 || hlook
->root
.type
== bfd_link_hash_indirect
);
1685 slook
= hlook
->root
.u
.def
.section
;
1686 vlook
= hlook
->root
.u
.def
.value
;
1688 hpp
= elf_sym_hashes (abfd
);
1689 hppend
= hpp
+ extsymcount
;
1690 for (; hpp
< hppend
; hpp
++)
1692 struct elf_link_hash_entry
*h
;
1695 if (h
!= NULL
&& h
!= hlook
1696 && h
->root
.type
== bfd_link_hash_defined
1697 && h
->root
.u
.def
.section
== slook
1698 && h
->root
.u
.def
.value
== vlook
)
1702 /* If the weak definition is in the list of dynamic
1703 symbols, make sure the real definition is put there
1705 if (hlook
->dynindx
!= -1
1706 && h
->dynindx
== -1)
1708 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1712 /* If the real definition is in the list of dynamic
1713 symbols, make sure the weak definition is put there
1714 as well. If we don't do this, then the dynamic
1715 loader might not merge the entries for the real
1716 definition and the weak definition. */
1717 if (h
->dynindx
!= -1
1718 && hlook
->dynindx
== -1)
1720 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1735 if (extversym
!= NULL
)
1741 /* If this object is the same format as the output object, and it is
1742 not a shared library, then let the backend look through the
1745 This is required to build global offset table entries and to
1746 arrange for dynamic relocs. It is not required for the
1747 particular common case of linking non PIC code, even when linking
1748 against shared libraries, but unfortunately there is no way of
1749 knowing whether an object file has been compiled PIC or not.
1750 Looking through the relocs is not particularly time consuming.
1751 The problem is that we must either (1) keep the relocs in memory,
1752 which causes the linker to require additional runtime memory or
1753 (2) read the relocs twice from the input file, which wastes time.
1754 This would be a good case for using mmap.
1756 I have no idea how to handle linking PIC code into a file of a
1757 different format. It probably can't be done. */
1758 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1760 && abfd
->xvec
== info
->hash
->creator
1761 && check_relocs
!= NULL
)
1765 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1767 Elf_Internal_Rela
*internal_relocs
;
1770 if ((o
->flags
& SEC_RELOC
) == 0
1771 || o
->reloc_count
== 0
1772 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1773 && (o
->flags
& SEC_DEBUGGING
) != 0)
1774 || bfd_is_abs_section (o
->output_section
))
1777 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1778 (abfd
, o
, (PTR
) NULL
,
1779 (Elf_Internal_Rela
*) NULL
,
1780 info
->keep_memory
));
1781 if (internal_relocs
== NULL
)
1784 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1786 if (! info
->keep_memory
)
1787 free (internal_relocs
);
1794 /* If this is a non-traditional, non-relocateable link, try to
1795 optimize the handling of the .stab/.stabstr sections. */
1797 && ! info
->relocateable
1798 && ! info
->traditional_format
1799 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1800 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1802 asection
*stab
, *stabstr
;
1804 stab
= bfd_get_section_by_name (abfd
, ".stab");
1807 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1809 if (stabstr
!= NULL
)
1811 struct bfd_elf_section_data
*secdata
;
1813 secdata
= elf_section_data (stab
);
1814 if (! _bfd_link_section_stabs (abfd
,
1815 &elf_hash_table (info
)->stab_info
,
1817 &secdata
->stab_info
))
1832 if (extversym
!= NULL
)
1837 /* Create some sections which will be filled in with dynamic linking
1838 information. ABFD is an input file which requires dynamic sections
1839 to be created. The dynamic sections take up virtual memory space
1840 when the final executable is run, so we need to create them before
1841 addresses are assigned to the output sections. We work out the
1842 actual contents and size of these sections later. */
1845 elf_link_create_dynamic_sections (abfd
, info
)
1847 struct bfd_link_info
*info
;
1850 register asection
*s
;
1851 struct elf_link_hash_entry
*h
;
1852 struct elf_backend_data
*bed
;
1854 if (elf_hash_table (info
)->dynamic_sections_created
)
1857 /* Make sure that all dynamic sections use the same input BFD. */
1858 if (elf_hash_table (info
)->dynobj
== NULL
)
1859 elf_hash_table (info
)->dynobj
= abfd
;
1861 abfd
= elf_hash_table (info
)->dynobj
;
1863 /* Note that we set the SEC_IN_MEMORY flag for all of these
1865 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1866 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1868 /* A dynamically linked executable has a .interp section, but a
1869 shared library does not. */
1872 s
= bfd_make_section (abfd
, ".interp");
1874 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1878 /* Create sections to hold version informations. These are removed
1879 if they are not needed. */
1880 s
= bfd_make_section (abfd
, ".gnu.version_d");
1882 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1883 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1886 s
= bfd_make_section (abfd
, ".gnu.version");
1888 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1889 || ! bfd_set_section_alignment (abfd
, s
, 1))
1892 s
= bfd_make_section (abfd
, ".gnu.version_r");
1894 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1895 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1898 s
= bfd_make_section (abfd
, ".dynsym");
1900 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1901 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1904 s
= bfd_make_section (abfd
, ".dynstr");
1906 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1909 /* Create a strtab to hold the dynamic symbol names. */
1910 if (elf_hash_table (info
)->dynstr
== NULL
)
1912 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1913 if (elf_hash_table (info
)->dynstr
== NULL
)
1917 s
= bfd_make_section (abfd
, ".dynamic");
1919 || ! bfd_set_section_flags (abfd
, s
, flags
)
1920 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1923 /* The special symbol _DYNAMIC is always set to the start of the
1924 .dynamic section. This call occurs before we have processed the
1925 symbols for any dynamic object, so we don't have to worry about
1926 overriding a dynamic definition. We could set _DYNAMIC in a
1927 linker script, but we only want to define it if we are, in fact,
1928 creating a .dynamic section. We don't want to define it if there
1929 is no .dynamic section, since on some ELF platforms the start up
1930 code examines it to decide how to initialize the process. */
1932 if (! (_bfd_generic_link_add_one_symbol
1933 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1934 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1935 (struct bfd_link_hash_entry
**) &h
)))
1937 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1938 h
->type
= STT_OBJECT
;
1941 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1944 s
= bfd_make_section (abfd
, ".hash");
1946 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1947 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1950 /* Let the backend create the rest of the sections. This lets the
1951 backend set the right flags. The backend will normally create
1952 the .got and .plt sections. */
1953 bed
= get_elf_backend_data (abfd
);
1954 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1957 elf_hash_table (info
)->dynamic_sections_created
= true;
1962 /* Add an entry to the .dynamic table. */
1965 elf_add_dynamic_entry (info
, tag
, val
)
1966 struct bfd_link_info
*info
;
1970 Elf_Internal_Dyn dyn
;
1974 bfd_byte
*newcontents
;
1976 dynobj
= elf_hash_table (info
)->dynobj
;
1978 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1979 BFD_ASSERT (s
!= NULL
);
1981 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1982 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1983 if (newcontents
== NULL
)
1987 dyn
.d_un
.d_val
= val
;
1988 elf_swap_dyn_out (dynobj
, &dyn
,
1989 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1991 s
->_raw_size
= newsize
;
1992 s
->contents
= newcontents
;
1998 /* Read and swap the relocs from the section indicated by SHDR. This
1999 may be either a REL or a RELA section. The relocations are
2000 translated into RELA relocations and stored in INTERNAL_RELOCS,
2001 which should have already been allocated to contain enough space.
2002 The EXTERNAL_RELOCS are a buffer where the external form of the
2003 relocations should be stored.
2005 Returns false if something goes wrong. */
2008 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2011 Elf_Internal_Shdr
*shdr
;
2012 PTR external_relocs
;
2013 Elf_Internal_Rela
*internal_relocs
;
2015 /* If there aren't any relocations, that's OK. */
2019 /* Position ourselves at the start of the section. */
2020 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2023 /* Read the relocations. */
2024 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2028 /* Convert the external relocations to the internal format. */
2029 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2031 Elf_External_Rel
*erel
;
2032 Elf_External_Rel
*erelend
;
2033 Elf_Internal_Rela
*irela
;
2035 erel
= (Elf_External_Rel
*) external_relocs
;
2036 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2037 irela
= internal_relocs
;
2038 for (; erel
< erelend
; erel
++, irela
++)
2040 Elf_Internal_Rel irel
;
2042 elf_swap_reloc_in (abfd
, erel
, &irel
);
2043 irela
->r_offset
= irel
.r_offset
;
2044 irela
->r_info
= irel
.r_info
;
2045 irela
->r_addend
= 0;
2050 Elf_External_Rela
*erela
;
2051 Elf_External_Rela
*erelaend
;
2052 Elf_Internal_Rela
*irela
;
2054 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2056 erela
= (Elf_External_Rela
*) external_relocs
;
2057 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2058 irela
= internal_relocs
;
2059 for (; erela
< erelaend
; erela
++, irela
++)
2060 elf_swap_reloca_in (abfd
, erela
, irela
);
2066 /* Read and swap the relocs for a section. They may have been cached.
2067 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
2068 they are used as buffers to read into. They are known to be large
2069 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
2070 value is allocated using either malloc or bfd_alloc, according to
2071 the KEEP_MEMORY argument. */
2074 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2078 PTR external_relocs
;
2079 Elf_Internal_Rela
*internal_relocs
;
2080 boolean keep_memory
;
2082 Elf_Internal_Shdr
*rel_hdr
;
2084 Elf_Internal_Rela
*alloc2
= NULL
;
2086 if (elf_section_data (o
)->relocs
!= NULL
)
2087 return elf_section_data (o
)->relocs
;
2089 if (o
->reloc_count
== 0)
2092 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2094 if (internal_relocs
== NULL
)
2098 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2100 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2102 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2103 if (internal_relocs
== NULL
)
2107 if (external_relocs
== NULL
)
2109 size_t size
= (size_t) rel_hdr
->sh_size
;
2111 if (elf_section_data (o
)->rel_hdr2
)
2112 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2113 alloc1
= (PTR
) bfd_malloc (size
);
2116 external_relocs
= alloc1
;
2119 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2123 if (!elf_link_read_relocs_from_section
2125 elf_section_data (o
)->rel_hdr2
,
2126 external_relocs
+ rel_hdr
->sh_size
,
2127 internal_relocs
+ rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
))
2130 /* Cache the results for next time, if we can. */
2132 elf_section_data (o
)->relocs
= internal_relocs
;
2137 /* Don't free alloc2, since if it was allocated we are passing it
2138 back (under the name of internal_relocs). */
2140 return internal_relocs
;
2151 /* Record an assignment to a symbol made by a linker script. We need
2152 this in case some dynamic object refers to this symbol. */
2156 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2158 struct bfd_link_info
*info
;
2162 struct elf_link_hash_entry
*h
;
2164 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2167 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2171 if (h
->root
.type
== bfd_link_hash_new
)
2172 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2174 /* If this symbol is being provided by the linker script, and it is
2175 currently defined by a dynamic object, but not by a regular
2176 object, then mark it as undefined so that the generic linker will
2177 force the correct value. */
2179 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2180 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2181 h
->root
.type
= bfd_link_hash_undefined
;
2183 /* If this symbol is not being provided by the linker script, and it is
2184 currently defined by a dynamic object, but not by a regular object,
2185 then clear out any version information because the symbol will not be
2186 associated with the dynamic object any more. */
2188 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2189 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2190 h
->verinfo
.verdef
= NULL
;
2192 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2193 h
->type
= STT_OBJECT
;
2195 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2196 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2198 && h
->dynindx
== -1)
2200 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2203 /* If this is a weak defined symbol, and we know a corresponding
2204 real symbol from the same dynamic object, make sure the real
2205 symbol is also made into a dynamic symbol. */
2206 if (h
->weakdef
!= NULL
2207 && h
->weakdef
->dynindx
== -1)
2209 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2217 /* This structure is used to pass information to
2218 elf_link_assign_sym_version. */
2220 struct elf_assign_sym_version_info
2224 /* General link information. */
2225 struct bfd_link_info
*info
;
2227 struct bfd_elf_version_tree
*verdefs
;
2228 /* Whether we are exporting all dynamic symbols. */
2229 boolean export_dynamic
;
2230 /* Whether we removed any symbols from the dynamic symbol table. */
2231 boolean removed_dynamic
;
2232 /* Whether we had a failure. */
2236 /* This structure is used to pass information to
2237 elf_link_find_version_dependencies. */
2239 struct elf_find_verdep_info
2243 /* General link information. */
2244 struct bfd_link_info
*info
;
2245 /* The number of dependencies. */
2247 /* Whether we had a failure. */
2251 /* Array used to determine the number of hash table buckets to use
2252 based on the number of symbols there are. If there are fewer than
2253 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2254 fewer than 37 we use 17 buckets, and so forth. We never use more
2255 than 32771 buckets. */
2257 static const size_t elf_buckets
[] =
2259 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2263 /* Compute bucket count for hashing table. We do not use a static set
2264 of possible tables sizes anymore. Instead we determine for all
2265 possible reasonable sizes of the table the outcome (i.e., the
2266 number of collisions etc) and choose the best solution. The
2267 weighting functions are not too simple to allow the table to grow
2268 without bounds. Instead one of the weighting factors is the size.
2269 Therefore the result is always a good payoff between few collisions
2270 (= short chain lengths) and table size. */
2272 compute_bucket_count (info
)
2273 struct bfd_link_info
*info
;
2275 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2277 unsigned long int *hashcodes
;
2278 unsigned long int *hashcodesp
;
2279 unsigned long int i
;
2281 /* Compute the hash values for all exported symbols. At the same
2282 time store the values in an array so that we could use them for
2284 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2285 * sizeof (unsigned long int));
2286 if (hashcodes
== NULL
)
2288 hashcodesp
= hashcodes
;
2290 /* Put all hash values in HASHCODES. */
2291 elf_link_hash_traverse (elf_hash_table (info
),
2292 elf_collect_hash_codes
, &hashcodesp
);
2294 /* We have a problem here. The following code to optimize the table
2295 size requires an integer type with more the 32 bits. If
2296 BFD_HOST_U_64_BIT is set we know about such a type. */
2297 #ifdef BFD_HOST_U_64_BIT
2298 if (info
->optimize
== true)
2300 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2303 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2304 unsigned long int *counts
;
2306 /* Possible optimization parameters: if we have NSYMS symbols we say
2307 that the hashing table must at least have NSYMS/4 and at most
2309 minsize
= nsyms
/ 4;
2312 best_size
= maxsize
= nsyms
* 2;
2314 /* Create array where we count the collisions in. We must use bfd_malloc
2315 since the size could be large. */
2316 counts
= (unsigned long int *) bfd_malloc (maxsize
2317 * sizeof (unsigned long int));
2324 /* Compute the "optimal" size for the hash table. The criteria is a
2325 minimal chain length. The minor criteria is (of course) the size
2327 for (i
= minsize
; i
< maxsize
; ++i
)
2329 /* Walk through the array of hashcodes and count the collisions. */
2330 BFD_HOST_U_64_BIT max
;
2331 unsigned long int j
;
2332 unsigned long int fact
;
2334 memset (counts
, '\0', i
* sizeof (unsigned long int));
2336 /* Determine how often each hash bucket is used. */
2337 for (j
= 0; j
< nsyms
; ++j
)
2338 ++counts
[hashcodes
[j
] % i
];
2340 /* For the weight function we need some information about the
2341 pagesize on the target. This is information need not be 100%
2342 accurate. Since this information is not available (so far) we
2343 define it here to a reasonable default value. If it is crucial
2344 to have a better value some day simply define this value. */
2345 # ifndef BFD_TARGET_PAGESIZE
2346 # define BFD_TARGET_PAGESIZE (4096)
2349 /* We in any case need 2 + NSYMS entries for the size values and
2351 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2354 /* Variant 1: optimize for short chains. We add the squares
2355 of all the chain lengths (which favous many small chain
2356 over a few long chains). */
2357 for (j
= 0; j
< i
; ++j
)
2358 max
+= counts
[j
] * counts
[j
];
2360 /* This adds penalties for the overall size of the table. */
2361 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2364 /* Variant 2: Optimize a lot more for small table. Here we
2365 also add squares of the size but we also add penalties for
2366 empty slots (the +1 term). */
2367 for (j
= 0; j
< i
; ++j
)
2368 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2370 /* The overall size of the table is considered, but not as
2371 strong as in variant 1, where it is squared. */
2372 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2376 /* Compare with current best results. */
2377 if (max
< best_chlen
)
2387 #endif /* defined (BFD_HOST_U_64_BIT) */
2389 /* This is the fallback solution if no 64bit type is available or if we
2390 are not supposed to spend much time on optimizations. We select the
2391 bucket count using a fixed set of numbers. */
2392 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2394 best_size
= elf_buckets
[i
];
2395 if (dynsymcount
< elf_buckets
[i
+ 1])
2400 /* Free the arrays we needed. */
2406 /* Remove SECTION from the BFD. If a symbol for SECTION was going to
2407 be put into the dynamic symbol table, remove it, and renumber
2408 subsequent entries. */
2411 elf_link_remove_section_and_adjust_dynindices (info
, section
)
2412 struct bfd_link_info
*info
;
2415 /* Remove the section from the output list. */
2416 _bfd_strip_section_from_output (section
);
2418 if (elf_section_data (section
->output_section
)->dynindx
)
2423 /* We were going to output an entry in the dynamic symbol table
2424 for the symbol corresponding to this section. Now, the
2425 section is gone. So, we must renumber the dynamic indices of
2426 all subsequent sections and all other entries in the dynamic
2428 elf_section_data (section
->output_section
)->dynindx
= 0;
2429 for (s
= section
->output_section
->next
; s
; s
= s
->next
)
2430 if (elf_section_data (s
)->dynindx
)
2431 --elf_section_data (s
)->dynindx
;
2433 elf_link_hash_traverse (elf_hash_table (info
),
2434 _bfd_elf_link_adjust_dynindx
,
2437 /* There is one less dynamic symbol than there was before. */
2438 --elf_hash_table (info
)->dynsymcount
;
2442 /* Set up the sizes and contents of the ELF dynamic sections. This is
2443 called by the ELF linker emulation before_allocation routine. We
2444 must set the sizes of the sections before the linker sets the
2445 addresses of the various sections. */
2448 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2449 export_dynamic
, filter_shlib
,
2450 auxiliary_filters
, info
, sinterpptr
,
2455 boolean export_dynamic
;
2456 const char *filter_shlib
;
2457 const char * const *auxiliary_filters
;
2458 struct bfd_link_info
*info
;
2459 asection
**sinterpptr
;
2460 struct bfd_elf_version_tree
*verdefs
;
2462 bfd_size_type soname_indx
;
2464 struct elf_backend_data
*bed
;
2465 bfd_size_type old_dynsymcount
;
2466 struct elf_assign_sym_version_info asvinfo
;
2470 soname_indx
= (bfd_size_type
) -1;
2472 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2475 /* The backend may have to create some sections regardless of whether
2476 we're dynamic or not. */
2477 bed
= get_elf_backend_data (output_bfd
);
2478 if (bed
->elf_backend_always_size_sections
2479 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2482 dynobj
= elf_hash_table (info
)->dynobj
;
2484 /* If there were no dynamic objects in the link, there is nothing to
2489 /* If we are supposed to export all symbols into the dynamic symbol
2490 table (this is not the normal case), then do so. */
2493 struct elf_info_failed eif
;
2497 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2503 if (elf_hash_table (info
)->dynamic_sections_created
)
2505 struct elf_info_failed eif
;
2506 struct elf_link_hash_entry
*h
;
2507 bfd_size_type strsize
;
2509 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2510 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2514 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2515 soname
, true, true);
2516 if (soname_indx
== (bfd_size_type
) -1
2517 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2523 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2531 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2533 if (indx
== (bfd_size_type
) -1
2534 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2538 if (filter_shlib
!= NULL
)
2542 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2543 filter_shlib
, true, true);
2544 if (indx
== (bfd_size_type
) -1
2545 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2549 if (auxiliary_filters
!= NULL
)
2551 const char * const *p
;
2553 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2557 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2559 if (indx
== (bfd_size_type
) -1
2560 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2565 /* Attach all the symbols to their version information. */
2566 asvinfo
.output_bfd
= output_bfd
;
2567 asvinfo
.info
= info
;
2568 asvinfo
.verdefs
= verdefs
;
2569 asvinfo
.export_dynamic
= export_dynamic
;
2570 asvinfo
.removed_dynamic
= false;
2571 asvinfo
.failed
= false;
2573 elf_link_hash_traverse (elf_hash_table (info
),
2574 elf_link_assign_sym_version
,
2579 /* Find all symbols which were defined in a dynamic object and make
2580 the backend pick a reasonable value for them. */
2583 elf_link_hash_traverse (elf_hash_table (info
),
2584 elf_adjust_dynamic_symbol
,
2589 /* Add some entries to the .dynamic section. We fill in some of the
2590 values later, in elf_bfd_final_link, but we must add the entries
2591 now so that we know the final size of the .dynamic section. */
2592 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2595 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2596 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2598 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2601 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2604 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2605 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2607 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2610 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2611 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2612 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2613 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2614 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2615 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2616 sizeof (Elf_External_Sym
)))
2620 /* The backend must work out the sizes of all the other dynamic
2622 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2623 if (bed
->elf_backend_size_dynamic_sections
2624 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2627 if (elf_hash_table (info
)->dynamic_sections_created
)
2631 size_t bucketcount
= 0;
2632 Elf_Internal_Sym isym
;
2634 /* Set up the version definition section. */
2635 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2636 BFD_ASSERT (s
!= NULL
);
2638 /* We may have created additional version definitions if we are
2639 just linking a regular application. */
2640 verdefs
= asvinfo
.verdefs
;
2642 if (verdefs
== NULL
)
2643 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2648 struct bfd_elf_version_tree
*t
;
2650 Elf_Internal_Verdef def
;
2651 Elf_Internal_Verdaux defaux
;
2653 if (asvinfo
.removed_dynamic
)
2655 /* Some dynamic symbols were changed to be local
2656 symbols. In this case, we renumber all of the
2657 dynamic symbols, so that we don't have a hole. If
2658 the backend changed dynsymcount, then assume that the
2659 new symbols are at the start. This is the case on
2660 the MIPS. FIXME: The names of the removed symbols
2661 will still be in the dynamic string table, wasting
2663 elf_hash_table (info
)->dynsymcount
=
2664 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2665 elf_link_hash_traverse (elf_hash_table (info
),
2666 elf_link_renumber_dynsyms
,
2673 /* Make space for the base version. */
2674 size
+= sizeof (Elf_External_Verdef
);
2675 size
+= sizeof (Elf_External_Verdaux
);
2678 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2680 struct bfd_elf_version_deps
*n
;
2682 size
+= sizeof (Elf_External_Verdef
);
2683 size
+= sizeof (Elf_External_Verdaux
);
2686 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2687 size
+= sizeof (Elf_External_Verdaux
);
2690 s
->_raw_size
= size
;
2691 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2692 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2695 /* Fill in the version definition section. */
2699 def
.vd_version
= VER_DEF_CURRENT
;
2700 def
.vd_flags
= VER_FLG_BASE
;
2703 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2704 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2705 + sizeof (Elf_External_Verdaux
));
2707 if (soname_indx
!= (bfd_size_type
) -1)
2709 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2710 defaux
.vda_name
= soname_indx
;
2717 name
= output_bfd
->filename
;
2718 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2719 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2721 if (indx
== (bfd_size_type
) -1)
2723 defaux
.vda_name
= indx
;
2725 defaux
.vda_next
= 0;
2727 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2728 (Elf_External_Verdef
*)p
);
2729 p
+= sizeof (Elf_External_Verdef
);
2730 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2731 (Elf_External_Verdaux
*) p
);
2732 p
+= sizeof (Elf_External_Verdaux
);
2734 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2737 struct bfd_elf_version_deps
*n
;
2738 struct elf_link_hash_entry
*h
;
2741 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2744 /* Add a symbol representing this version. */
2746 if (! (_bfd_generic_link_add_one_symbol
2747 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2748 (bfd_vma
) 0, (const char *) NULL
, false,
2749 get_elf_backend_data (dynobj
)->collect
,
2750 (struct bfd_link_hash_entry
**) &h
)))
2752 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2753 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2754 h
->type
= STT_OBJECT
;
2755 h
->verinfo
.vertree
= t
;
2757 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2760 def
.vd_version
= VER_DEF_CURRENT
;
2762 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2763 def
.vd_flags
|= VER_FLG_WEAK
;
2764 def
.vd_ndx
= t
->vernum
+ 1;
2765 def
.vd_cnt
= cdeps
+ 1;
2766 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2767 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2768 if (t
->next
!= NULL
)
2769 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2770 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2774 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2775 (Elf_External_Verdef
*) p
);
2776 p
+= sizeof (Elf_External_Verdef
);
2778 defaux
.vda_name
= h
->dynstr_index
;
2779 if (t
->deps
== NULL
)
2780 defaux
.vda_next
= 0;
2782 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2783 t
->name_indx
= defaux
.vda_name
;
2785 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2786 (Elf_External_Verdaux
*) p
);
2787 p
+= sizeof (Elf_External_Verdaux
);
2789 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2791 if (n
->version_needed
== NULL
)
2793 /* This can happen if there was an error in the
2795 defaux
.vda_name
= 0;
2798 defaux
.vda_name
= n
->version_needed
->name_indx
;
2799 if (n
->next
== NULL
)
2800 defaux
.vda_next
= 0;
2802 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2804 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2805 (Elf_External_Verdaux
*) p
);
2806 p
+= sizeof (Elf_External_Verdaux
);
2810 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2811 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2814 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2817 /* Work out the size of the version reference section. */
2819 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2820 BFD_ASSERT (s
!= NULL
);
2822 struct elf_find_verdep_info sinfo
;
2824 sinfo
.output_bfd
= output_bfd
;
2826 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2827 if (sinfo
.vers
== 0)
2829 sinfo
.failed
= false;
2831 elf_link_hash_traverse (elf_hash_table (info
),
2832 elf_link_find_version_dependencies
,
2835 if (elf_tdata (output_bfd
)->verref
== NULL
)
2836 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2839 Elf_Internal_Verneed
*t
;
2844 /* Build the version definition section. */
2847 for (t
= elf_tdata (output_bfd
)->verref
;
2851 Elf_Internal_Vernaux
*a
;
2853 size
+= sizeof (Elf_External_Verneed
);
2855 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2856 size
+= sizeof (Elf_External_Vernaux
);
2859 s
->_raw_size
= size
;
2860 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2861 if (s
->contents
== NULL
)
2865 for (t
= elf_tdata (output_bfd
)->verref
;
2870 Elf_Internal_Vernaux
*a
;
2874 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2877 t
->vn_version
= VER_NEED_CURRENT
;
2879 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2880 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2881 elf_dt_name (t
->vn_bfd
),
2884 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2885 t
->vn_bfd
->filename
, true, false);
2886 if (indx
== (bfd_size_type
) -1)
2889 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2890 if (t
->vn_nextref
== NULL
)
2893 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2894 + caux
* sizeof (Elf_External_Vernaux
));
2896 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2897 (Elf_External_Verneed
*) p
);
2898 p
+= sizeof (Elf_External_Verneed
);
2900 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2902 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2904 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2905 a
->vna_nodename
, true, false);
2906 if (indx
== (bfd_size_type
) -1)
2909 if (a
->vna_nextptr
== NULL
)
2912 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2914 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2915 (Elf_External_Vernaux
*) p
);
2916 p
+= sizeof (Elf_External_Vernaux
);
2920 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2921 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2924 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2928 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2930 /* Work out the size of the symbol version section. */
2931 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2932 BFD_ASSERT (s
!= NULL
);
2933 if (dynsymcount
== 0
2934 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2936 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2937 /* The DYNSYMCOUNT might have changed if we were going to
2938 output a dynamic symbol table entry for S. */
2939 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2943 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2944 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2945 if (s
->contents
== NULL
)
2948 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2952 /* Set the size of the .dynsym and .hash sections. We counted
2953 the number of dynamic symbols in elf_link_add_object_symbols.
2954 We will build the contents of .dynsym and .hash when we build
2955 the final symbol table, because until then we do not know the
2956 correct value to give the symbols. We built the .dynstr
2957 section as we went along in elf_link_add_object_symbols. */
2958 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2959 BFD_ASSERT (s
!= NULL
);
2960 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2961 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2962 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2965 /* The first entry in .dynsym is a dummy symbol. */
2972 elf_swap_symbol_out (output_bfd
, &isym
,
2973 (PTR
) (Elf_External_Sym
*) s
->contents
);
2975 /* Compute the size of the hashing table. As a side effect this
2976 computes the hash values for all the names we export. */
2977 bucketcount
= compute_bucket_count (info
);
2979 s
= bfd_get_section_by_name (dynobj
, ".hash");
2980 BFD_ASSERT (s
!= NULL
);
2981 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2982 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2983 if (s
->contents
== NULL
)
2985 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2987 put_word (output_bfd
, bucketcount
, s
->contents
);
2988 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2990 elf_hash_table (info
)->bucketcount
= bucketcount
;
2992 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2993 BFD_ASSERT (s
!= NULL
);
2994 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2996 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3003 /* Fix up the flags for a symbol. This handles various cases which
3004 can only be fixed after all the input files are seen. This is
3005 currently called by both adjust_dynamic_symbol and
3006 assign_sym_version, which is unnecessary but perhaps more robust in
3007 the face of future changes. */
3010 elf_fix_symbol_flags (h
, eif
)
3011 struct elf_link_hash_entry
*h
;
3012 struct elf_info_failed
*eif
;
3014 /* If this symbol was mentioned in a non-ELF file, try to set
3015 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3016 permit a non-ELF file to correctly refer to a symbol defined in
3017 an ELF dynamic object. */
3018 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3020 if (h
->root
.type
!= bfd_link_hash_defined
3021 && h
->root
.type
!= bfd_link_hash_defweak
)
3022 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3023 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3026 if (h
->root
.u
.def
.section
->owner
!= NULL
3027 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3028 == bfd_target_elf_flavour
))
3029 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3030 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3032 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3035 if (h
->dynindx
== -1
3036 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3037 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3039 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3048 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3049 was first seen in a non-ELF file. Fortunately, if the symbol
3050 was first seen in an ELF file, we're probably OK unless the
3051 symbol was defined in a non-ELF file. Catch that case here.
3052 FIXME: We're still in trouble if the symbol was first seen in
3053 a dynamic object, and then later in a non-ELF regular object. */
3054 if ((h
->root
.type
== bfd_link_hash_defined
3055 || h
->root
.type
== bfd_link_hash_defweak
)
3056 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3057 && (h
->root
.u
.def
.section
->owner
!= NULL
3058 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3059 != bfd_target_elf_flavour
)
3060 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3061 && (h
->elf_link_hash_flags
3062 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3063 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3066 /* If this is a final link, and the symbol was defined as a common
3067 symbol in a regular object file, and there was no definition in
3068 any dynamic object, then the linker will have allocated space for
3069 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3070 flag will not have been set. */
3071 if (h
->root
.type
== bfd_link_hash_defined
3072 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3073 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3074 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3075 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3076 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3078 /* If -Bsymbolic was used (which means to bind references to global
3079 symbols to the definition within the shared object), and this
3080 symbol was defined in a regular object, then it actually doesn't
3081 need a PLT entry. */
3082 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3083 && eif
->info
->shared
3084 && eif
->info
->symbolic
3085 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3087 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3088 h
->plt
.offset
= (bfd_vma
) -1;
3094 /* Make the backend pick a good value for a dynamic symbol. This is
3095 called via elf_link_hash_traverse, and also calls itself
3099 elf_adjust_dynamic_symbol (h
, data
)
3100 struct elf_link_hash_entry
*h
;
3103 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3105 struct elf_backend_data
*bed
;
3107 /* Ignore indirect symbols. These are added by the versioning code. */
3108 if (h
->root
.type
== bfd_link_hash_indirect
)
3111 /* Fix the symbol flags. */
3112 if (! elf_fix_symbol_flags (h
, eif
))
3115 /* If this symbol does not require a PLT entry, and it is not
3116 defined by a dynamic object, or is not referenced by a regular
3117 object, ignore it. We do have to handle a weak defined symbol,
3118 even if no regular object refers to it, if we decided to add it
3119 to the dynamic symbol table. FIXME: Do we normally need to worry
3120 about symbols which are defined by one dynamic object and
3121 referenced by another one? */
3122 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3123 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3124 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3125 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3126 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3128 h
->plt
.offset
= (bfd_vma
) -1;
3132 /* If we've already adjusted this symbol, don't do it again. This
3133 can happen via a recursive call. */
3134 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3137 /* Don't look at this symbol again. Note that we must set this
3138 after checking the above conditions, because we may look at a
3139 symbol once, decide not to do anything, and then get called
3140 recursively later after REF_REGULAR is set below. */
3141 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3143 /* If this is a weak definition, and we know a real definition, and
3144 the real symbol is not itself defined by a regular object file,
3145 then get a good value for the real definition. We handle the
3146 real symbol first, for the convenience of the backend routine.
3148 Note that there is a confusing case here. If the real definition
3149 is defined by a regular object file, we don't get the real symbol
3150 from the dynamic object, but we do get the weak symbol. If the
3151 processor backend uses a COPY reloc, then if some routine in the
3152 dynamic object changes the real symbol, we will not see that
3153 change in the corresponding weak symbol. This is the way other
3154 ELF linkers work as well, and seems to be a result of the shared
3157 I will clarify this issue. Most SVR4 shared libraries define the
3158 variable _timezone and define timezone as a weak synonym. The
3159 tzset call changes _timezone. If you write
3160 extern int timezone;
3162 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3163 you might expect that, since timezone is a synonym for _timezone,
3164 the same number will print both times. However, if the processor
3165 backend uses a COPY reloc, then actually timezone will be copied
3166 into your process image, and, since you define _timezone
3167 yourself, _timezone will not. Thus timezone and _timezone will
3168 wind up at different memory locations. The tzset call will set
3169 _timezone, leaving timezone unchanged. */
3171 if (h
->weakdef
!= NULL
)
3173 struct elf_link_hash_entry
*weakdef
;
3175 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3176 || h
->root
.type
== bfd_link_hash_defweak
);
3177 weakdef
= h
->weakdef
;
3178 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3179 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3180 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3181 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3183 /* This symbol is defined by a regular object file, so we
3184 will not do anything special. Clear weakdef for the
3185 convenience of the processor backend. */
3190 /* There is an implicit reference by a regular object file
3191 via the weak symbol. */
3192 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3193 if (h
->weakdef
->elf_link_hash_flags
3194 & ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3195 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3196 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
3201 /* If a symbol has no type and no size and does not require a PLT
3202 entry, then we are probably about to do the wrong thing here: we
3203 are probably going to create a COPY reloc for an empty object.
3204 This case can arise when a shared object is built with assembly
3205 code, and the assembly code fails to set the symbol type. */
3207 && h
->type
== STT_NOTYPE
3208 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3209 (*_bfd_error_handler
)
3210 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3211 h
->root
.root
.string
);
3213 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3214 bed
= get_elf_backend_data (dynobj
);
3215 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3224 /* This routine is used to export all defined symbols into the dynamic
3225 symbol table. It is called via elf_link_hash_traverse. */
3228 elf_export_symbol (h
, data
)
3229 struct elf_link_hash_entry
*h
;
3232 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3234 /* Ignore indirect symbols. These are added by the versioning code. */
3235 if (h
->root
.type
== bfd_link_hash_indirect
)
3238 if (h
->dynindx
== -1
3239 && (h
->elf_link_hash_flags
3240 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3242 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3252 /* Look through the symbols which are defined in other shared
3253 libraries and referenced here. Update the list of version
3254 dependencies. This will be put into the .gnu.version_r section.
3255 This function is called via elf_link_hash_traverse. */
3258 elf_link_find_version_dependencies (h
, data
)
3259 struct elf_link_hash_entry
*h
;
3262 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3263 Elf_Internal_Verneed
*t
;
3264 Elf_Internal_Vernaux
*a
;
3266 /* We only care about symbols defined in shared objects with version
3268 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3269 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3271 || h
->verinfo
.verdef
== NULL
)
3274 /* See if we already know about this version. */
3275 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3277 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3280 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3281 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3287 /* This is a new version. Add it to tree we are building. */
3291 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3294 rinfo
->failed
= true;
3298 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3299 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3300 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3303 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3305 /* Note that we are copying a string pointer here, and testing it
3306 above. If bfd_elf_string_from_elf_section is ever changed to
3307 discard the string data when low in memory, this will have to be
3309 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3311 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3312 a
->vna_nextptr
= t
->vn_auxptr
;
3314 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3317 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3324 /* Figure out appropriate versions for all the symbols. We may not
3325 have the version number script until we have read all of the input
3326 files, so until that point we don't know which symbols should be
3327 local. This function is called via elf_link_hash_traverse. */
3330 elf_link_assign_sym_version (h
, data
)
3331 struct elf_link_hash_entry
*h
;
3334 struct elf_assign_sym_version_info
*sinfo
=
3335 (struct elf_assign_sym_version_info
*) data
;
3336 struct bfd_link_info
*info
= sinfo
->info
;
3337 struct elf_info_failed eif
;
3340 /* Fix the symbol flags. */
3343 if (! elf_fix_symbol_flags (h
, &eif
))
3346 sinfo
->failed
= true;
3350 /* We only need version numbers for symbols defined in regular
3352 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3355 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3356 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3358 struct bfd_elf_version_tree
*t
;
3363 /* There are two consecutive ELF_VER_CHR characters if this is
3364 not a hidden symbol. */
3366 if (*p
== ELF_VER_CHR
)
3372 /* If there is no version string, we can just return out. */
3376 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3380 /* Look for the version. If we find it, it is no longer weak. */
3381 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3383 if (strcmp (t
->name
, p
) == 0)
3387 struct bfd_elf_version_expr
*d
;
3389 len
= p
- h
->root
.root
.string
;
3390 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3393 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3394 alc
[len
- 1] = '\0';
3395 if (alc
[len
- 2] == ELF_VER_CHR
)
3396 alc
[len
- 2] = '\0';
3398 h
->verinfo
.vertree
= t
;
3402 if (t
->globals
!= NULL
)
3404 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3405 if ((*d
->match
) (d
, alc
))
3409 /* See if there is anything to force this symbol to
3411 if (d
== NULL
&& t
->locals
!= NULL
)
3413 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3415 if ((*d
->match
) (d
, alc
))
3417 if (h
->dynindx
!= -1
3419 && ! sinfo
->export_dynamic
)
3421 sinfo
->removed_dynamic
= true;
3422 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3423 h
->elf_link_hash_flags
&=~
3424 ELF_LINK_HASH_NEEDS_PLT
;
3426 h
->plt
.offset
= (bfd_vma
) -1;
3427 /* FIXME: The name of the symbol has
3428 already been recorded in the dynamic
3429 string table section. */
3437 bfd_release (sinfo
->output_bfd
, alc
);
3442 /* If we are building an application, we need to create a
3443 version node for this version. */
3444 if (t
== NULL
&& ! info
->shared
)
3446 struct bfd_elf_version_tree
**pp
;
3449 /* If we aren't going to export this symbol, we don't need
3450 to worry about it. */
3451 if (h
->dynindx
== -1)
3454 t
= ((struct bfd_elf_version_tree
*)
3455 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3458 sinfo
->failed
= true;
3467 t
->name_indx
= (unsigned int) -1;
3471 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3473 t
->vernum
= version_index
;
3477 h
->verinfo
.vertree
= t
;
3481 /* We could not find the version for a symbol when
3482 generating a shared archive. Return an error. */
3483 (*_bfd_error_handler
)
3484 (_("%s: undefined versioned symbol name %s"),
3485 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3486 bfd_set_error (bfd_error_bad_value
);
3487 sinfo
->failed
= true;
3492 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3495 /* If we don't have a version for this symbol, see if we can find
3497 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3499 struct bfd_elf_version_tree
*t
;
3500 struct bfd_elf_version_tree
*deflt
;
3501 struct bfd_elf_version_expr
*d
;
3503 /* See if can find what version this symbol is in. If the
3504 symbol is supposed to be local, then don't actually register
3507 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3509 if (t
->globals
!= NULL
)
3511 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3513 if ((*d
->match
) (d
, h
->root
.root
.string
))
3515 h
->verinfo
.vertree
= t
;
3524 if (t
->locals
!= NULL
)
3526 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3528 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3530 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3532 h
->verinfo
.vertree
= t
;
3533 if (h
->dynindx
!= -1
3535 && ! sinfo
->export_dynamic
)
3537 sinfo
->removed_dynamic
= true;
3538 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3539 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3541 h
->plt
.offset
= (bfd_vma
) -1;
3542 /* FIXME: The name of the symbol has already
3543 been recorded in the dynamic string table
3555 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3557 h
->verinfo
.vertree
= deflt
;
3558 if (h
->dynindx
!= -1
3560 && ! sinfo
->export_dynamic
)
3562 sinfo
->removed_dynamic
= true;
3563 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3564 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3566 h
->plt
.offset
= (bfd_vma
) -1;
3567 /* FIXME: The name of the symbol has already been
3568 recorded in the dynamic string table section. */
3576 /* This function is used to renumber the dynamic symbols, if some of
3577 them are removed because they are marked as local. This is called
3578 via elf_link_hash_traverse. */
3581 elf_link_renumber_dynsyms (h
, data
)
3582 struct elf_link_hash_entry
*h
;
3585 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3587 if (h
->dynindx
!= -1)
3589 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3590 ++elf_hash_table (info
)->dynsymcount
;
3596 /* Final phase of ELF linker. */
3598 /* A structure we use to avoid passing large numbers of arguments. */
3600 struct elf_final_link_info
3602 /* General link information. */
3603 struct bfd_link_info
*info
;
3606 /* Symbol string table. */
3607 struct bfd_strtab_hash
*symstrtab
;
3608 /* .dynsym section. */
3609 asection
*dynsym_sec
;
3610 /* .hash section. */
3612 /* symbol version section (.gnu.version). */
3613 asection
*symver_sec
;
3614 /* Buffer large enough to hold contents of any section. */
3616 /* Buffer large enough to hold external relocs of any section. */
3617 PTR external_relocs
;
3618 /* Buffer large enough to hold internal relocs of any section. */
3619 Elf_Internal_Rela
*internal_relocs
;
3620 /* Buffer large enough to hold external local symbols of any input
3622 Elf_External_Sym
*external_syms
;
3623 /* Buffer large enough to hold internal local symbols of any input
3625 Elf_Internal_Sym
*internal_syms
;
3626 /* Array large enough to hold a symbol index for each local symbol
3627 of any input BFD. */
3629 /* Array large enough to hold a section pointer for each local
3630 symbol of any input BFD. */
3631 asection
**sections
;
3632 /* Buffer to hold swapped out symbols. */
3633 Elf_External_Sym
*symbuf
;
3634 /* Number of swapped out symbols in buffer. */
3635 size_t symbuf_count
;
3636 /* Number of symbols which fit in symbuf. */
3640 static boolean elf_link_output_sym
3641 PARAMS ((struct elf_final_link_info
*, const char *,
3642 Elf_Internal_Sym
*, asection
*));
3643 static boolean elf_link_flush_output_syms
3644 PARAMS ((struct elf_final_link_info
*));
3645 static boolean elf_link_output_extsym
3646 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3647 static boolean elf_link_input_bfd
3648 PARAMS ((struct elf_final_link_info
*, bfd
*));
3649 static boolean elf_reloc_link_order
3650 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3651 struct bfd_link_order
*));
3653 /* This struct is used to pass information to elf_link_output_extsym. */
3655 struct elf_outext_info
3659 struct elf_final_link_info
*finfo
;
3662 /* Do the final step of an ELF link. */
3665 elf_bfd_final_link (abfd
, info
)
3667 struct bfd_link_info
*info
;
3671 struct elf_final_link_info finfo
;
3672 register asection
*o
;
3673 register struct bfd_link_order
*p
;
3675 size_t max_contents_size
;
3676 size_t max_external_reloc_size
;
3677 size_t max_internal_reloc_count
;
3678 size_t max_sym_count
;
3680 Elf_Internal_Sym elfsym
;
3682 Elf_Internal_Shdr
*symtab_hdr
;
3683 Elf_Internal_Shdr
*symstrtab_hdr
;
3684 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3685 struct elf_outext_info eoinfo
;
3688 abfd
->flags
|= DYNAMIC
;
3690 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3691 dynobj
= elf_hash_table (info
)->dynobj
;
3694 finfo
.output_bfd
= abfd
;
3695 finfo
.symstrtab
= elf_stringtab_init ();
3696 if (finfo
.symstrtab
== NULL
)
3701 finfo
.dynsym_sec
= NULL
;
3702 finfo
.hash_sec
= NULL
;
3703 finfo
.symver_sec
= NULL
;
3707 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3708 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3709 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3710 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3711 /* Note that it is OK if symver_sec is NULL. */
3714 finfo
.contents
= NULL
;
3715 finfo
.external_relocs
= NULL
;
3716 finfo
.internal_relocs
= NULL
;
3717 finfo
.external_syms
= NULL
;
3718 finfo
.internal_syms
= NULL
;
3719 finfo
.indices
= NULL
;
3720 finfo
.sections
= NULL
;
3721 finfo
.symbuf
= NULL
;
3722 finfo
.symbuf_count
= 0;
3724 /* Count up the number of relocations we will output for each output
3725 section, so that we know the sizes of the reloc sections. We
3726 also figure out some maximum sizes. */
3727 max_contents_size
= 0;
3728 max_external_reloc_size
= 0;
3729 max_internal_reloc_count
= 0;
3731 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3735 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3737 if (p
->type
== bfd_section_reloc_link_order
3738 || p
->type
== bfd_symbol_reloc_link_order
)
3740 else if (p
->type
== bfd_indirect_link_order
)
3744 sec
= p
->u
.indirect
.section
;
3746 /* Mark all sections which are to be included in the
3747 link. This will normally be every section. We need
3748 to do this so that we can identify any sections which
3749 the linker has decided to not include. */
3750 sec
->linker_mark
= true;
3752 if (info
->relocateable
)
3753 o
->reloc_count
+= sec
->reloc_count
;
3755 if (sec
->_raw_size
> max_contents_size
)
3756 max_contents_size
= sec
->_raw_size
;
3757 if (sec
->_cooked_size
> max_contents_size
)
3758 max_contents_size
= sec
->_cooked_size
;
3760 /* We are interested in just local symbols, not all
3762 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3763 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3767 if (elf_bad_symtab (sec
->owner
))
3768 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3769 / sizeof (Elf_External_Sym
));
3771 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3773 if (sym_count
> max_sym_count
)
3774 max_sym_count
= sym_count
;
3776 if ((sec
->flags
& SEC_RELOC
) != 0)
3780 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3781 if (ext_size
> max_external_reloc_size
)
3782 max_external_reloc_size
= ext_size
;
3783 if (sec
->reloc_count
> max_internal_reloc_count
)
3784 max_internal_reloc_count
= sec
->reloc_count
;
3790 if (o
->reloc_count
> 0)
3791 o
->flags
|= SEC_RELOC
;
3794 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3795 set it (this is probably a bug) and if it is set
3796 assign_section_numbers will create a reloc section. */
3797 o
->flags
&=~ SEC_RELOC
;
3800 /* If the SEC_ALLOC flag is not set, force the section VMA to
3801 zero. This is done in elf_fake_sections as well, but forcing
3802 the VMA to 0 here will ensure that relocs against these
3803 sections are handled correctly. */
3804 if ((o
->flags
& SEC_ALLOC
) == 0
3805 && ! o
->user_set_vma
)
3809 /* Figure out the file positions for everything but the symbol table
3810 and the relocs. We set symcount to force assign_section_numbers
3811 to create a symbol table. */
3812 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
3813 BFD_ASSERT (! abfd
->output_has_begun
);
3814 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3817 /* That created the reloc sections. Set their sizes, and assign
3818 them file positions, and allocate some buffers. */
3819 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3821 if ((o
->flags
& SEC_RELOC
) != 0)
3823 Elf_Internal_Shdr
*rel_hdr
;
3824 register struct elf_link_hash_entry
**p
, **pend
;
3826 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3828 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3830 /* The contents field must last into write_object_contents,
3831 so we allocate it with bfd_alloc rather than malloc. */
3832 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3833 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3836 p
= ((struct elf_link_hash_entry
**)
3837 bfd_malloc (o
->reloc_count
3838 * sizeof (struct elf_link_hash_entry
*)));
3839 if (p
== NULL
&& o
->reloc_count
!= 0)
3841 elf_section_data (o
)->rel_hashes
= p
;
3842 pend
= p
+ o
->reloc_count
;
3843 for (; p
< pend
; p
++)
3846 /* Use the reloc_count field as an index when outputting the
3852 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3854 /* We have now assigned file positions for all the sections except
3855 .symtab and .strtab. We start the .symtab section at the current
3856 file position, and write directly to it. We build the .strtab
3857 section in memory. */
3858 bfd_get_symcount (abfd
) = 0;
3859 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3860 /* sh_name is set in prep_headers. */
3861 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3862 symtab_hdr
->sh_flags
= 0;
3863 symtab_hdr
->sh_addr
= 0;
3864 symtab_hdr
->sh_size
= 0;
3865 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3866 /* sh_link is set in assign_section_numbers. */
3867 /* sh_info is set below. */
3868 /* sh_offset is set just below. */
3869 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3871 off
= elf_tdata (abfd
)->next_file_pos
;
3872 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3874 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3875 incorrect. We do not yet know the size of the .symtab section.
3876 We correct next_file_pos below, after we do know the size. */
3878 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3879 continuously seeking to the right position in the file. */
3880 if (! info
->keep_memory
|| max_sym_count
< 20)
3881 finfo
.symbuf_size
= 20;
3883 finfo
.symbuf_size
= max_sym_count
;
3884 finfo
.symbuf
= ((Elf_External_Sym
*)
3885 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3886 if (finfo
.symbuf
== NULL
)
3889 /* Start writing out the symbol table. The first symbol is always a
3891 if (info
->strip
!= strip_all
|| info
->relocateable
)
3893 elfsym
.st_value
= 0;
3896 elfsym
.st_other
= 0;
3897 elfsym
.st_shndx
= SHN_UNDEF
;
3898 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3899 &elfsym
, bfd_und_section_ptr
))
3904 /* Some standard ELF linkers do this, but we don't because it causes
3905 bootstrap comparison failures. */
3906 /* Output a file symbol for the output file as the second symbol.
3907 We output this even if we are discarding local symbols, although
3908 I'm not sure if this is correct. */
3909 elfsym
.st_value
= 0;
3911 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3912 elfsym
.st_other
= 0;
3913 elfsym
.st_shndx
= SHN_ABS
;
3914 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3915 &elfsym
, bfd_abs_section_ptr
))
3919 /* Output a symbol for each section. We output these even if we are
3920 discarding local symbols, since they are used for relocs. These
3921 symbols have no names. We store the index of each one in the
3922 index field of the section, so that we can find it again when
3923 outputting relocs. */
3924 if (info
->strip
!= strip_all
|| info
->relocateable
)
3927 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3928 elfsym
.st_other
= 0;
3929 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3931 o
= section_from_elf_index (abfd
, i
);
3933 o
->target_index
= bfd_get_symcount (abfd
);
3934 elfsym
.st_shndx
= i
;
3935 if (info
->relocateable
|| o
== NULL
)
3936 elfsym
.st_value
= 0;
3938 elfsym
.st_value
= o
->vma
;
3939 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3945 /* Allocate some memory to hold information read in from the input
3947 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3948 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3949 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3950 bfd_malloc (max_internal_reloc_count
3951 * sizeof (Elf_Internal_Rela
)));
3952 finfo
.external_syms
= ((Elf_External_Sym
*)
3953 bfd_malloc (max_sym_count
3954 * sizeof (Elf_External_Sym
)));
3955 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3956 bfd_malloc (max_sym_count
3957 * sizeof (Elf_Internal_Sym
)));
3958 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3959 finfo
.sections
= ((asection
**)
3960 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3961 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3962 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3963 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3964 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3965 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3966 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3967 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3970 /* Since ELF permits relocations to be against local symbols, we
3971 must have the local symbols available when we do the relocations.
3972 Since we would rather only read the local symbols once, and we
3973 would rather not keep them in memory, we handle all the
3974 relocations for a single input file at the same time.
3976 Unfortunately, there is no way to know the total number of local
3977 symbols until we have seen all of them, and the local symbol
3978 indices precede the global symbol indices. This means that when
3979 we are generating relocateable output, and we see a reloc against
3980 a global symbol, we can not know the symbol index until we have
3981 finished examining all the local symbols to see which ones we are
3982 going to output. To deal with this, we keep the relocations in
3983 memory, and don't output them until the end of the link. This is
3984 an unfortunate waste of memory, but I don't see a good way around
3985 it. Fortunately, it only happens when performing a relocateable
3986 link, which is not the common case. FIXME: If keep_memory is set
3987 we could write the relocs out and then read them again; I don't
3988 know how bad the memory loss will be. */
3990 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
3991 sub
->output_has_begun
= false;
3992 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3994 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3996 if (p
->type
== bfd_indirect_link_order
3997 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3998 == bfd_target_elf_flavour
))
4000 sub
= p
->u
.indirect
.section
->owner
;
4001 if (! sub
->output_has_begun
)
4003 if (! elf_link_input_bfd (&finfo
, sub
))
4005 sub
->output_has_begun
= true;
4008 else if (p
->type
== bfd_section_reloc_link_order
4009 || p
->type
== bfd_symbol_reloc_link_order
)
4011 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4016 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4022 /* That wrote out all the local symbols. Finish up the symbol table
4023 with the global symbols. */
4025 if (info
->strip
!= strip_all
&& info
->shared
)
4027 /* Output any global symbols that got converted to local in a
4028 version script. We do this in a separate step since ELF
4029 requires all local symbols to appear prior to any global
4030 symbols. FIXME: We should only do this if some global
4031 symbols were, in fact, converted to become local. FIXME:
4032 Will this work correctly with the Irix 5 linker? */
4033 eoinfo
.failed
= false;
4034 eoinfo
.finfo
= &finfo
;
4035 eoinfo
.localsyms
= true;
4036 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4042 /* The sh_info field records the index of the first non local
4044 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4046 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
4048 /* We get the global symbols from the hash table. */
4049 eoinfo
.failed
= false;
4050 eoinfo
.localsyms
= false;
4051 eoinfo
.finfo
= &finfo
;
4052 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4057 /* Flush all symbols to the file. */
4058 if (! elf_link_flush_output_syms (&finfo
))
4061 /* Now we know the size of the symtab section. */
4062 off
+= symtab_hdr
->sh_size
;
4064 /* Finish up and write out the symbol string table (.strtab)
4066 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4067 /* sh_name was set in prep_headers. */
4068 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4069 symstrtab_hdr
->sh_flags
= 0;
4070 symstrtab_hdr
->sh_addr
= 0;
4071 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4072 symstrtab_hdr
->sh_entsize
= 0;
4073 symstrtab_hdr
->sh_link
= 0;
4074 symstrtab_hdr
->sh_info
= 0;
4075 /* sh_offset is set just below. */
4076 symstrtab_hdr
->sh_addralign
= 1;
4078 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4079 elf_tdata (abfd
)->next_file_pos
= off
;
4081 if (bfd_get_symcount (abfd
) > 0)
4083 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4084 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4088 /* Adjust the relocs to have the correct symbol indices. */
4089 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4091 struct elf_link_hash_entry
**rel_hash
;
4092 Elf_Internal_Shdr
*rel_hdr
;
4094 if ((o
->flags
& SEC_RELOC
) == 0)
4097 rel_hash
= elf_section_data (o
)->rel_hashes
;
4098 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4099 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
4101 if (*rel_hash
== NULL
)
4104 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4106 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4108 Elf_External_Rel
*erel
;
4109 Elf_Internal_Rel irel
;
4111 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4112 elf_swap_reloc_in (abfd
, erel
, &irel
);
4113 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4114 ELF_R_TYPE (irel
.r_info
));
4115 elf_swap_reloc_out (abfd
, &irel
, erel
);
4119 Elf_External_Rela
*erela
;
4120 Elf_Internal_Rela irela
;
4122 BFD_ASSERT (rel_hdr
->sh_entsize
4123 == sizeof (Elf_External_Rela
));
4125 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4126 elf_swap_reloca_in (abfd
, erela
, &irela
);
4127 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4128 ELF_R_TYPE (irela
.r_info
));
4129 elf_swap_reloca_out (abfd
, &irela
, erela
);
4133 /* Set the reloc_count field to 0 to prevent write_relocs from
4134 trying to swap the relocs out itself. */
4138 /* If we are linking against a dynamic object, or generating a
4139 shared library, finish up the dynamic linking information. */
4142 Elf_External_Dyn
*dyncon
, *dynconend
;
4144 /* Fix up .dynamic entries. */
4145 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4146 BFD_ASSERT (o
!= NULL
);
4148 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4149 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4150 for (; dyncon
< dynconend
; dyncon
++)
4152 Elf_Internal_Dyn dyn
;
4156 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4163 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
4164 magic _init and _fini symbols. This is pretty ugly,
4165 but we are compatible. */
4173 struct elf_link_hash_entry
*h
;
4175 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4176 false, false, true);
4178 && (h
->root
.type
== bfd_link_hash_defined
4179 || h
->root
.type
== bfd_link_hash_defweak
))
4181 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4182 o
= h
->root
.u
.def
.section
;
4183 if (o
->output_section
!= NULL
)
4184 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4185 + o
->output_offset
);
4188 /* The symbol is imported from another shared
4189 library and does not apply to this one. */
4193 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4208 name
= ".gnu.version_d";
4211 name
= ".gnu.version_r";
4214 name
= ".gnu.version";
4216 o
= bfd_get_section_by_name (abfd
, name
);
4217 BFD_ASSERT (o
!= NULL
);
4218 dyn
.d_un
.d_ptr
= o
->vma
;
4219 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4226 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4231 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4233 Elf_Internal_Shdr
*hdr
;
4235 hdr
= elf_elfsections (abfd
)[i
];
4236 if (hdr
->sh_type
== type
4237 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4239 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4240 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4243 if (dyn
.d_un
.d_val
== 0
4244 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4245 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4249 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4255 /* If we have created any dynamic sections, then output them. */
4258 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4261 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4263 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4264 || o
->_raw_size
== 0)
4266 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4268 /* At this point, we are only interested in sections
4269 created by elf_link_create_dynamic_sections. */
4272 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4274 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4276 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4277 o
->contents
, o
->output_offset
,
4285 /* The contents of the .dynstr section are actually in a
4287 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4288 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4289 || ! _bfd_stringtab_emit (abfd
,
4290 elf_hash_table (info
)->dynstr
))
4296 /* If we have optimized stabs strings, output them. */
4297 if (elf_hash_table (info
)->stab_info
!= NULL
)
4299 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4303 if (finfo
.symstrtab
!= NULL
)
4304 _bfd_stringtab_free (finfo
.symstrtab
);
4305 if (finfo
.contents
!= NULL
)
4306 free (finfo
.contents
);
4307 if (finfo
.external_relocs
!= NULL
)
4308 free (finfo
.external_relocs
);
4309 if (finfo
.internal_relocs
!= NULL
)
4310 free (finfo
.internal_relocs
);
4311 if (finfo
.external_syms
!= NULL
)
4312 free (finfo
.external_syms
);
4313 if (finfo
.internal_syms
!= NULL
)
4314 free (finfo
.internal_syms
);
4315 if (finfo
.indices
!= NULL
)
4316 free (finfo
.indices
);
4317 if (finfo
.sections
!= NULL
)
4318 free (finfo
.sections
);
4319 if (finfo
.symbuf
!= NULL
)
4320 free (finfo
.symbuf
);
4321 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4323 if ((o
->flags
& SEC_RELOC
) != 0
4324 && elf_section_data (o
)->rel_hashes
!= NULL
)
4325 free (elf_section_data (o
)->rel_hashes
);
4328 elf_tdata (abfd
)->linker
= true;
4333 if (finfo
.symstrtab
!= NULL
)
4334 _bfd_stringtab_free (finfo
.symstrtab
);
4335 if (finfo
.contents
!= NULL
)
4336 free (finfo
.contents
);
4337 if (finfo
.external_relocs
!= NULL
)
4338 free (finfo
.external_relocs
);
4339 if (finfo
.internal_relocs
!= NULL
)
4340 free (finfo
.internal_relocs
);
4341 if (finfo
.external_syms
!= NULL
)
4342 free (finfo
.external_syms
);
4343 if (finfo
.internal_syms
!= NULL
)
4344 free (finfo
.internal_syms
);
4345 if (finfo
.indices
!= NULL
)
4346 free (finfo
.indices
);
4347 if (finfo
.sections
!= NULL
)
4348 free (finfo
.sections
);
4349 if (finfo
.symbuf
!= NULL
)
4350 free (finfo
.symbuf
);
4351 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4353 if ((o
->flags
& SEC_RELOC
) != 0
4354 && elf_section_data (o
)->rel_hashes
!= NULL
)
4355 free (elf_section_data (o
)->rel_hashes
);
4361 /* Add a symbol to the output symbol table. */
4364 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4365 struct elf_final_link_info
*finfo
;
4367 Elf_Internal_Sym
*elfsym
;
4368 asection
*input_sec
;
4370 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4371 struct bfd_link_info
*info
,
4376 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4377 elf_backend_link_output_symbol_hook
;
4378 if (output_symbol_hook
!= NULL
)
4380 if (! ((*output_symbol_hook
)
4381 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4385 if (name
== (const char *) NULL
|| *name
== '\0')
4386 elfsym
->st_name
= 0;
4387 else if (input_sec
->flags
& SEC_EXCLUDE
)
4388 elfsym
->st_name
= 0;
4391 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4394 if (elfsym
->st_name
== (unsigned long) -1)
4398 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4400 if (! elf_link_flush_output_syms (finfo
))
4404 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4405 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4406 ++finfo
->symbuf_count
;
4408 ++ bfd_get_symcount (finfo
->output_bfd
);
4413 /* Flush the output symbols to the file. */
4416 elf_link_flush_output_syms (finfo
)
4417 struct elf_final_link_info
*finfo
;
4419 if (finfo
->symbuf_count
> 0)
4421 Elf_Internal_Shdr
*symtab
;
4423 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4425 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4427 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4428 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4429 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4432 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4434 finfo
->symbuf_count
= 0;
4440 /* Add an external symbol to the symbol table. This is called from
4441 the hash table traversal routine. When generating a shared object,
4442 we go through the symbol table twice. The first time we output
4443 anything that might have been forced to local scope in a version
4444 script. The second time we output the symbols that are still
4448 elf_link_output_extsym (h
, data
)
4449 struct elf_link_hash_entry
*h
;
4452 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4453 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4455 Elf_Internal_Sym sym
;
4456 asection
*input_sec
;
4458 /* Decide whether to output this symbol in this pass. */
4459 if (eoinfo
->localsyms
)
4461 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4466 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4470 /* If we are not creating a shared library, and this symbol is
4471 referenced by a shared library but is not defined anywhere, then
4472 warn that it is undefined. If we do not do this, the runtime
4473 linker will complain that the symbol is undefined when the
4474 program is run. We don't have to worry about symbols that are
4475 referenced by regular files, because we will already have issued
4476 warnings for them. */
4477 if (! finfo
->info
->relocateable
4478 && ! (finfo
->info
->shared
4479 && !finfo
->info
->symbolic
4480 && !finfo
->info
->no_undefined
)
4481 && h
->root
.type
== bfd_link_hash_undefined
4482 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4483 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4485 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4486 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4487 (asection
*) NULL
, 0)))
4489 eoinfo
->failed
= true;
4494 /* We don't want to output symbols that have never been mentioned by
4495 a regular file, or that we have been told to strip. However, if
4496 h->indx is set to -2, the symbol is used by a reloc and we must
4500 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4501 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4502 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4503 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4505 else if (finfo
->info
->strip
== strip_all
4506 || (finfo
->info
->strip
== strip_some
4507 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4508 h
->root
.root
.string
,
4509 false, false) == NULL
))
4514 /* If we're stripping it, and it's not a dynamic symbol, there's
4515 nothing else to do. */
4516 if (strip
&& h
->dynindx
== -1)
4520 sym
.st_size
= h
->size
;
4521 sym
.st_other
= h
->other
;
4522 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4523 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4524 else if (h
->root
.type
== bfd_link_hash_undefweak
4525 || h
->root
.type
== bfd_link_hash_defweak
)
4526 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4528 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4530 switch (h
->root
.type
)
4533 case bfd_link_hash_new
:
4537 case bfd_link_hash_undefined
:
4538 input_sec
= bfd_und_section_ptr
;
4539 sym
.st_shndx
= SHN_UNDEF
;
4542 case bfd_link_hash_undefweak
:
4543 input_sec
= bfd_und_section_ptr
;
4544 sym
.st_shndx
= SHN_UNDEF
;
4547 case bfd_link_hash_defined
:
4548 case bfd_link_hash_defweak
:
4550 input_sec
= h
->root
.u
.def
.section
;
4551 if (input_sec
->output_section
!= NULL
)
4554 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4555 input_sec
->output_section
);
4556 if (sym
.st_shndx
== (unsigned short) -1)
4558 (*_bfd_error_handler
)
4559 (_("%s: could not find output section %s for input section %s"),
4560 bfd_get_filename (finfo
->output_bfd
),
4561 input_sec
->output_section
->name
,
4563 eoinfo
->failed
= true;
4567 /* ELF symbols in relocateable files are section relative,
4568 but in nonrelocateable files they are virtual
4570 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4571 if (! finfo
->info
->relocateable
)
4572 sym
.st_value
+= input_sec
->output_section
->vma
;
4576 BFD_ASSERT (input_sec
->owner
== NULL
4577 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4578 sym
.st_shndx
= SHN_UNDEF
;
4579 input_sec
= bfd_und_section_ptr
;
4584 case bfd_link_hash_common
:
4585 input_sec
= h
->root
.u
.c
.p
->section
;
4586 sym
.st_shndx
= SHN_COMMON
;
4587 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4590 case bfd_link_hash_indirect
:
4591 /* These symbols are created by symbol versioning. They point
4592 to the decorated version of the name. For example, if the
4593 symbol foo@@GNU_1.2 is the default, which should be used when
4594 foo is used with no version, then we add an indirect symbol
4595 foo which points to foo@@GNU_1.2. We ignore these symbols,
4596 since the indirected symbol is already in the hash table. If
4597 the indirect symbol is non-ELF, fall through and output it. */
4598 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4602 case bfd_link_hash_warning
:
4603 /* We can't represent these symbols in ELF, although a warning
4604 symbol may have come from a .gnu.warning.SYMBOL section. We
4605 just put the target symbol in the hash table. If the target
4606 symbol does not really exist, don't do anything. */
4607 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4609 return (elf_link_output_extsym
4610 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4613 /* Give the processor backend a chance to tweak the symbol value,
4614 and also to finish up anything that needs to be done for this
4616 if ((h
->dynindx
!= -1
4617 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4618 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4620 struct elf_backend_data
*bed
;
4622 bed
= get_elf_backend_data (finfo
->output_bfd
);
4623 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4624 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4626 eoinfo
->failed
= true;
4631 /* If we are marking the symbol as undefined, and there are no
4632 non-weak references to this symbol from a regular object, then
4633 mark the symbol as weak undefined. We can't do this earlier,
4634 because it might not be marked as undefined until the
4635 finish_dynamic_symbol routine gets through with it. */
4636 if (sym
.st_shndx
== SHN_UNDEF
4637 && sym
.st_info
== ELF_ST_INFO (STB_GLOBAL
, h
->type
)
4638 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
4639 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) == 0)
4640 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4642 /* If this symbol should be put in the .dynsym section, then put it
4643 there now. We have already know the symbol index. We also fill
4644 in the entry in the .hash section. */
4645 if (h
->dynindx
!= -1
4646 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4650 bfd_byte
*bucketpos
;
4653 sym
.st_name
= h
->dynstr_index
;
4655 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4656 (PTR
) (((Elf_External_Sym
*)
4657 finfo
->dynsym_sec
->contents
)
4660 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4661 bucket
= h
->elf_hash_value
% bucketcount
;
4662 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4663 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4664 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4665 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4666 put_word (finfo
->output_bfd
, chain
,
4667 ((bfd_byte
*) finfo
->hash_sec
->contents
4668 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4670 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4672 Elf_Internal_Versym iversym
;
4674 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4676 if (h
->verinfo
.verdef
== NULL
)
4677 iversym
.vs_vers
= 0;
4679 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4683 if (h
->verinfo
.vertree
== NULL
)
4684 iversym
.vs_vers
= 1;
4686 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4689 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4690 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4692 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4693 (((Elf_External_Versym
*)
4694 finfo
->symver_sec
->contents
)
4699 /* If we're stripping it, then it was just a dynamic symbol, and
4700 there's nothing else to do. */
4704 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
4706 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4708 eoinfo
->failed
= true;
4715 /* Link an input file into the linker output file. This function
4716 handles all the sections and relocations of the input file at once.
4717 This is so that we only have to read the local symbols once, and
4718 don't have to keep them in memory. */
4721 elf_link_input_bfd (finfo
, input_bfd
)
4722 struct elf_final_link_info
*finfo
;
4725 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4726 bfd
*, asection
*, bfd_byte
*,
4727 Elf_Internal_Rela
*,
4728 Elf_Internal_Sym
*, asection
**));
4730 Elf_Internal_Shdr
*symtab_hdr
;
4733 Elf_External_Sym
*external_syms
;
4734 Elf_External_Sym
*esym
;
4735 Elf_External_Sym
*esymend
;
4736 Elf_Internal_Sym
*isym
;
4738 asection
**ppsection
;
4741 output_bfd
= finfo
->output_bfd
;
4743 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4745 /* If this is a dynamic object, we don't want to do anything here:
4746 we don't want the local symbols, and we don't want the section
4748 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4751 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4752 if (elf_bad_symtab (input_bfd
))
4754 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4759 locsymcount
= symtab_hdr
->sh_info
;
4760 extsymoff
= symtab_hdr
->sh_info
;
4763 /* Read the local symbols. */
4764 if (symtab_hdr
->contents
!= NULL
)
4765 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4766 else if (locsymcount
== 0)
4767 external_syms
= NULL
;
4770 external_syms
= finfo
->external_syms
;
4771 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4772 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4773 locsymcount
, input_bfd
)
4774 != locsymcount
* sizeof (Elf_External_Sym
)))
4778 /* Swap in the local symbols and write out the ones which we know
4779 are going into the output file. */
4780 esym
= external_syms
;
4781 esymend
= esym
+ locsymcount
;
4782 isym
= finfo
->internal_syms
;
4783 pindex
= finfo
->indices
;
4784 ppsection
= finfo
->sections
;
4785 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4789 Elf_Internal_Sym osym
;
4791 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4794 if (elf_bad_symtab (input_bfd
))
4796 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4803 if (isym
->st_shndx
== SHN_UNDEF
)
4804 isec
= bfd_und_section_ptr
;
4805 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4806 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4807 else if (isym
->st_shndx
== SHN_ABS
)
4808 isec
= bfd_abs_section_ptr
;
4809 else if (isym
->st_shndx
== SHN_COMMON
)
4810 isec
= bfd_com_section_ptr
;
4819 /* Don't output the first, undefined, symbol. */
4820 if (esym
== external_syms
)
4823 /* If we are stripping all symbols, we don't want to output this
4825 if (finfo
->info
->strip
== strip_all
)
4828 /* We never output section symbols. Instead, we use the section
4829 symbol of the corresponding section in the output file. */
4830 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4833 /* If we are discarding all local symbols, we don't want to
4834 output this one. If we are generating a relocateable output
4835 file, then some of the local symbols may be required by
4836 relocs; we output them below as we discover that they are
4838 if (finfo
->info
->discard
== discard_all
)
4841 /* If this symbol is defined in a section which we are
4842 discarding, we don't need to keep it, but note that
4843 linker_mark is only reliable for sections that have contents.
4844 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4845 as well as linker_mark. */
4846 if (isym
->st_shndx
> 0
4847 && isym
->st_shndx
< SHN_LORESERVE
4849 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4850 || (! finfo
->info
->relocateable
4851 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4854 /* Get the name of the symbol. */
4855 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4860 /* See if we are discarding symbols with this name. */
4861 if ((finfo
->info
->strip
== strip_some
4862 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4864 || (finfo
->info
->discard
== discard_l
4865 && bfd_is_local_label_name (input_bfd
, name
)))
4868 /* If we get here, we are going to output this symbol. */
4872 /* Adjust the section index for the output file. */
4873 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4874 isec
->output_section
);
4875 if (osym
.st_shndx
== (unsigned short) -1)
4878 *pindex
= bfd_get_symcount (output_bfd
);
4880 /* ELF symbols in relocateable files are section relative, but
4881 in executable files they are virtual addresses. Note that
4882 this code assumes that all ELF sections have an associated
4883 BFD section with a reasonable value for output_offset; below
4884 we assume that they also have a reasonable value for
4885 output_section. Any special sections must be set up to meet
4886 these requirements. */
4887 osym
.st_value
+= isec
->output_offset
;
4888 if (! finfo
->info
->relocateable
)
4889 osym
.st_value
+= isec
->output_section
->vma
;
4891 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4895 /* Relocate the contents of each section. */
4896 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4900 if (! o
->linker_mark
)
4902 /* This section was omitted from the link. */
4906 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4907 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4910 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4912 /* Section was created by elf_link_create_dynamic_sections
4917 /* Get the contents of the section. They have been cached by a
4918 relaxation routine. Note that o is a section in an input
4919 file, so the contents field will not have been set by any of
4920 the routines which work on output files. */
4921 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4922 contents
= elf_section_data (o
)->this_hdr
.contents
;
4925 contents
= finfo
->contents
;
4926 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4927 (file_ptr
) 0, o
->_raw_size
))
4931 if ((o
->flags
& SEC_RELOC
) != 0)
4933 Elf_Internal_Rela
*internal_relocs
;
4935 /* Get the swapped relocs. */
4936 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4937 (input_bfd
, o
, finfo
->external_relocs
,
4938 finfo
->internal_relocs
, false));
4939 if (internal_relocs
== NULL
4940 && o
->reloc_count
> 0)
4943 /* Relocate the section by invoking a back end routine.
4945 The back end routine is responsible for adjusting the
4946 section contents as necessary, and (if using Rela relocs
4947 and generating a relocateable output file) adjusting the
4948 reloc addend as necessary.
4950 The back end routine does not have to worry about setting
4951 the reloc address or the reloc symbol index.
4953 The back end routine is given a pointer to the swapped in
4954 internal symbols, and can access the hash table entries
4955 for the external symbols via elf_sym_hashes (input_bfd).
4957 When generating relocateable output, the back end routine
4958 must handle STB_LOCAL/STT_SECTION symbols specially. The
4959 output symbol is going to be a section symbol
4960 corresponding to the output section, which will require
4961 the addend to be adjusted. */
4963 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4964 input_bfd
, o
, contents
,
4966 finfo
->internal_syms
,
4970 if (finfo
->info
->relocateable
)
4972 Elf_Internal_Rela
*irela
;
4973 Elf_Internal_Rela
*irelaend
;
4974 struct elf_link_hash_entry
**rel_hash
;
4975 Elf_Internal_Shdr
*input_rel_hdr
;
4976 Elf_Internal_Shdr
*output_rel_hdr
;
4978 /* Adjust the reloc addresses and symbol indices. */
4980 irela
= internal_relocs
;
4981 irelaend
= irela
+ o
->reloc_count
;
4982 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4983 + o
->output_section
->reloc_count
);
4984 for (; irela
< irelaend
; irela
++, rel_hash
++)
4986 unsigned long r_symndx
;
4987 Elf_Internal_Sym
*isym
;
4990 irela
->r_offset
+= o
->output_offset
;
4992 r_symndx
= ELF_R_SYM (irela
->r_info
);
4997 if (r_symndx
>= locsymcount
4998 || (elf_bad_symtab (input_bfd
)
4999 && finfo
->sections
[r_symndx
] == NULL
))
5001 struct elf_link_hash_entry
*rh
;
5004 /* This is a reloc against a global symbol. We
5005 have not yet output all the local symbols, so
5006 we do not know the symbol index of any global
5007 symbol. We set the rel_hash entry for this
5008 reloc to point to the global hash table entry
5009 for this symbol. The symbol index is then
5010 set at the end of elf_bfd_final_link. */
5011 indx
= r_symndx
- extsymoff
;
5012 rh
= elf_sym_hashes (input_bfd
)[indx
];
5013 while (rh
->root
.type
== bfd_link_hash_indirect
5014 || rh
->root
.type
== bfd_link_hash_warning
)
5015 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5017 /* Setting the index to -2 tells
5018 elf_link_output_extsym that this symbol is
5020 BFD_ASSERT (rh
->indx
< 0);
5028 /* This is a reloc against a local symbol. */
5031 isym
= finfo
->internal_syms
+ r_symndx
;
5032 sec
= finfo
->sections
[r_symndx
];
5033 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5035 /* I suppose the backend ought to fill in the
5036 section of any STT_SECTION symbol against a
5037 processor specific section. If we have
5038 discarded a section, the output_section will
5039 be the absolute section. */
5041 && (bfd_is_abs_section (sec
)
5042 || (sec
->output_section
!= NULL
5043 && bfd_is_abs_section (sec
->output_section
))))
5045 else if (sec
== NULL
|| sec
->owner
== NULL
)
5047 bfd_set_error (bfd_error_bad_value
);
5052 r_symndx
= sec
->output_section
->target_index
;
5053 BFD_ASSERT (r_symndx
!= 0);
5058 if (finfo
->indices
[r_symndx
] == -1)
5064 if (finfo
->info
->strip
== strip_all
)
5066 /* You can't do ld -r -s. */
5067 bfd_set_error (bfd_error_invalid_operation
);
5071 /* This symbol was skipped earlier, but
5072 since it is needed by a reloc, we
5073 must output it now. */
5074 link
= symtab_hdr
->sh_link
;
5075 name
= bfd_elf_string_from_elf_section (input_bfd
,
5081 osec
= sec
->output_section
;
5083 _bfd_elf_section_from_bfd_section (output_bfd
,
5085 if (isym
->st_shndx
== (unsigned short) -1)
5088 isym
->st_value
+= sec
->output_offset
;
5089 if (! finfo
->info
->relocateable
)
5090 isym
->st_value
+= osec
->vma
;
5092 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5094 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5098 r_symndx
= finfo
->indices
[r_symndx
];
5101 irela
->r_info
= ELF_R_INFO (r_symndx
,
5102 ELF_R_TYPE (irela
->r_info
));
5105 /* Swap out the relocs. */
5106 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5107 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
5108 BFD_ASSERT (output_rel_hdr
->sh_entsize
5109 == input_rel_hdr
->sh_entsize
);
5110 irela
= internal_relocs
;
5111 irelaend
= irela
+ o
->reloc_count
;
5112 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5114 Elf_External_Rel
*erel
;
5116 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
5117 + o
->output_section
->reloc_count
);
5118 for (; irela
< irelaend
; irela
++, erel
++)
5120 Elf_Internal_Rel irel
;
5122 irel
.r_offset
= irela
->r_offset
;
5123 irel
.r_info
= irela
->r_info
;
5124 BFD_ASSERT (irela
->r_addend
== 0);
5125 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5130 Elf_External_Rela
*erela
;
5132 BFD_ASSERT (input_rel_hdr
->sh_entsize
5133 == sizeof (Elf_External_Rela
));
5134 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
5135 + o
->output_section
->reloc_count
);
5136 for (; irela
< irelaend
; irela
++, erela
++)
5137 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5140 o
->output_section
->reloc_count
+= o
->reloc_count
;
5144 /* Write out the modified section contents. */
5145 if (elf_section_data (o
)->stab_info
== NULL
)
5147 if (! (o
->flags
& SEC_EXCLUDE
) &&
5148 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5149 contents
, o
->output_offset
,
5150 (o
->_cooked_size
!= 0
5157 if (! (_bfd_write_section_stabs
5158 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5159 o
, &elf_section_data (o
)->stab_info
, contents
)))
5167 /* Generate a reloc when linking an ELF file. This is a reloc
5168 requested by the linker, and does come from any input file. This
5169 is used to build constructor and destructor tables when linking
5173 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5175 struct bfd_link_info
*info
;
5176 asection
*output_section
;
5177 struct bfd_link_order
*link_order
;
5179 reloc_howto_type
*howto
;
5183 struct elf_link_hash_entry
**rel_hash_ptr
;
5184 Elf_Internal_Shdr
*rel_hdr
;
5186 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5189 bfd_set_error (bfd_error_bad_value
);
5193 addend
= link_order
->u
.reloc
.p
->addend
;
5195 /* Figure out the symbol index. */
5196 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5197 + output_section
->reloc_count
);
5198 if (link_order
->type
== bfd_section_reloc_link_order
)
5200 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5201 BFD_ASSERT (indx
!= 0);
5202 *rel_hash_ptr
= NULL
;
5206 struct elf_link_hash_entry
*h
;
5208 /* Treat a reloc against a defined symbol as though it were
5209 actually against the section. */
5210 h
= ((struct elf_link_hash_entry
*)
5211 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5212 link_order
->u
.reloc
.p
->u
.name
,
5213 false, false, true));
5215 && (h
->root
.type
== bfd_link_hash_defined
5216 || h
->root
.type
== bfd_link_hash_defweak
))
5220 section
= h
->root
.u
.def
.section
;
5221 indx
= section
->output_section
->target_index
;
5222 *rel_hash_ptr
= NULL
;
5223 /* It seems that we ought to add the symbol value to the
5224 addend here, but in practice it has already been added
5225 because it was passed to constructor_callback. */
5226 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5230 /* Setting the index to -2 tells elf_link_output_extsym that
5231 this symbol is used by a reloc. */
5238 if (! ((*info
->callbacks
->unattached_reloc
)
5239 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5240 (asection
*) NULL
, (bfd_vma
) 0)))
5246 /* If this is an inplace reloc, we must write the addend into the
5248 if (howto
->partial_inplace
&& addend
!= 0)
5251 bfd_reloc_status_type rstat
;
5255 size
= bfd_get_reloc_size (howto
);
5256 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5257 if (buf
== (bfd_byte
*) NULL
)
5259 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5265 case bfd_reloc_outofrange
:
5267 case bfd_reloc_overflow
:
5268 if (! ((*info
->callbacks
->reloc_overflow
)
5270 (link_order
->type
== bfd_section_reloc_link_order
5271 ? bfd_section_name (output_bfd
,
5272 link_order
->u
.reloc
.p
->u
.section
)
5273 : link_order
->u
.reloc
.p
->u
.name
),
5274 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5282 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5283 (file_ptr
) link_order
->offset
, size
);
5289 /* The address of a reloc is relative to the section in a
5290 relocateable file, and is a virtual address in an executable
5292 offset
= link_order
->offset
;
5293 if (! info
->relocateable
)
5294 offset
+= output_section
->vma
;
5296 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5298 if (rel_hdr
->sh_type
== SHT_REL
)
5300 Elf_Internal_Rel irel
;
5301 Elf_External_Rel
*erel
;
5303 irel
.r_offset
= offset
;
5304 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5305 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5306 + output_section
->reloc_count
);
5307 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5311 Elf_Internal_Rela irela
;
5312 Elf_External_Rela
*erela
;
5314 irela
.r_offset
= offset
;
5315 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5316 irela
.r_addend
= addend
;
5317 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5318 + output_section
->reloc_count
);
5319 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5322 ++output_section
->reloc_count
;
5328 /* Allocate a pointer to live in a linker created section. */
5331 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5333 struct bfd_link_info
*info
;
5334 elf_linker_section_t
*lsect
;
5335 struct elf_link_hash_entry
*h
;
5336 const Elf_Internal_Rela
*rel
;
5338 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5339 elf_linker_section_pointers_t
*linker_section_ptr
;
5340 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5342 BFD_ASSERT (lsect
!= NULL
);
5344 /* Is this a global symbol? */
5347 /* Has this symbol already been allocated, if so, our work is done */
5348 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5353 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5354 /* Make sure this symbol is output as a dynamic symbol. */
5355 if (h
->dynindx
== -1)
5357 if (! elf_link_record_dynamic_symbol (info
, h
))
5361 if (lsect
->rel_section
)
5362 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5365 else /* Allocation of a pointer to a local symbol */
5367 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5369 /* Allocate a table to hold the local symbols if first time */
5372 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5373 register unsigned int i
;
5375 ptr
= (elf_linker_section_pointers_t
**)
5376 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5381 elf_local_ptr_offsets (abfd
) = ptr
;
5382 for (i
= 0; i
< num_symbols
; i
++)
5383 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5386 /* Has this symbol already been allocated, if so, our work is done */
5387 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5392 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5396 /* If we are generating a shared object, we need to
5397 output a R_<xxx>_RELATIVE reloc so that the
5398 dynamic linker can adjust this GOT entry. */
5399 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5400 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5404 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5405 from internal memory. */
5406 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5407 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5408 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5410 if (!linker_section_ptr
)
5413 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5414 linker_section_ptr
->addend
= rel
->r_addend
;
5415 linker_section_ptr
->which
= lsect
->which
;
5416 linker_section_ptr
->written_address_p
= false;
5417 *ptr_linker_section_ptr
= linker_section_ptr
;
5420 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5422 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5423 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5424 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5425 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5427 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5429 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5430 lsect
->sym_hash
->root
.root
.string
,
5431 (long)ARCH_SIZE
/ 8,
5432 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5438 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5440 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5443 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5444 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5452 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5455 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5458 /* Fill in the address for a pointer generated in alinker section. */
5461 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5464 struct bfd_link_info
*info
;
5465 elf_linker_section_t
*lsect
;
5466 struct elf_link_hash_entry
*h
;
5468 const Elf_Internal_Rela
*rel
;
5471 elf_linker_section_pointers_t
*linker_section_ptr
;
5473 BFD_ASSERT (lsect
!= NULL
);
5475 if (h
!= NULL
) /* global symbol */
5477 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5481 BFD_ASSERT (linker_section_ptr
!= NULL
);
5483 if (! elf_hash_table (info
)->dynamic_sections_created
5486 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5488 /* This is actually a static link, or it is a
5489 -Bsymbolic link and the symbol is defined
5490 locally. We must initialize this entry in the
5493 When doing a dynamic link, we create a .rela.<xxx>
5494 relocation entry to initialize the value. This
5495 is done in the finish_dynamic_symbol routine. */
5496 if (!linker_section_ptr
->written_address_p
)
5498 linker_section_ptr
->written_address_p
= true;
5499 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5500 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5504 else /* local symbol */
5506 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5507 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5508 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5509 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5513 BFD_ASSERT (linker_section_ptr
!= NULL
);
5515 /* Write out pointer if it hasn't been rewritten out before */
5516 if (!linker_section_ptr
->written_address_p
)
5518 linker_section_ptr
->written_address_p
= true;
5519 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5520 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5524 asection
*srel
= lsect
->rel_section
;
5525 Elf_Internal_Rela outrel
;
5527 /* We need to generate a relative reloc for the dynamic linker. */
5529 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5532 BFD_ASSERT (srel
!= NULL
);
5534 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5535 + lsect
->section
->output_offset
5536 + linker_section_ptr
->offset
);
5537 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5538 outrel
.r_addend
= 0;
5539 elf_swap_reloca_out (output_bfd
, &outrel
,
5540 (((Elf_External_Rela
*)
5541 lsect
->section
->contents
)
5542 + lsect
->section
->reloc_count
));
5543 ++lsect
->section
->reloc_count
;
5548 relocation
= (lsect
->section
->output_offset
5549 + linker_section_ptr
->offset
5550 - lsect
->hole_offset
5551 - lsect
->sym_offset
);
5554 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5555 lsect
->name
, (long)relocation
, (long)relocation
);
5558 /* Subtract out the addend, because it will get added back in by the normal
5560 return relocation
- linker_section_ptr
->addend
;
5563 /* Garbage collect unused sections. */
5565 static boolean elf_gc_mark
5566 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5567 asection
* (*gc_mark_hook
)
5568 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5569 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5571 static boolean elf_gc_sweep
5572 PARAMS ((struct bfd_link_info
*info
,
5573 boolean (*gc_sweep_hook
)
5574 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5575 const Elf_Internal_Rela
*relocs
))));
5577 static boolean elf_gc_sweep_symbol
5578 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5580 static boolean elf_gc_allocate_got_offsets
5581 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5583 static boolean elf_gc_propagate_vtable_entries_used
5584 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5586 static boolean elf_gc_smash_unused_vtentry_relocs
5587 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5589 /* The mark phase of garbage collection. For a given section, mark
5590 it, and all the sections which define symbols to which it refers. */
5593 elf_gc_mark (info
, sec
, gc_mark_hook
)
5594 struct bfd_link_info
*info
;
5596 asection
* (*gc_mark_hook
)
5597 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5598 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5604 /* Look through the section relocs. */
5606 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5608 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5609 Elf_Internal_Shdr
*symtab_hdr
;
5610 struct elf_link_hash_entry
**sym_hashes
;
5613 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5614 bfd
*input_bfd
= sec
->owner
;
5616 /* GCFIXME: how to arrange so that relocs and symbols are not
5617 reread continually? */
5619 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5620 sym_hashes
= elf_sym_hashes (input_bfd
);
5622 /* Read the local symbols. */
5623 if (elf_bad_symtab (input_bfd
))
5625 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5629 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5630 if (symtab_hdr
->contents
)
5631 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5632 else if (nlocsyms
== 0)
5636 locsyms
= freesyms
=
5637 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5638 if (freesyms
== NULL
5639 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5640 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5641 nlocsyms
, input_bfd
)
5642 != nlocsyms
* sizeof (Elf_External_Sym
)))
5649 /* Read the relocations. */
5650 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5651 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5652 info
->keep_memory
));
5653 if (relstart
== NULL
)
5658 relend
= relstart
+ sec
->reloc_count
;
5660 for (rel
= relstart
; rel
< relend
; rel
++)
5662 unsigned long r_symndx
;
5664 struct elf_link_hash_entry
*h
;
5667 r_symndx
= ELF_R_SYM (rel
->r_info
);
5671 if (elf_bad_symtab (sec
->owner
))
5673 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5674 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5675 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5678 h
= sym_hashes
[r_symndx
- extsymoff
];
5679 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5682 else if (r_symndx
>= nlocsyms
)
5684 h
= sym_hashes
[r_symndx
- extsymoff
];
5685 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5689 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5690 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5693 if (rsec
&& !rsec
->gc_mark
)
5694 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5702 if (!info
->keep_memory
)
5712 /* The sweep phase of garbage collection. Remove all garbage sections. */
5715 elf_gc_sweep (info
, gc_sweep_hook
)
5716 struct bfd_link_info
*info
;
5717 boolean (*gc_sweep_hook
)
5718 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5719 const Elf_Internal_Rela
*relocs
));
5723 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5727 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5729 /* Keep special sections. Keep .debug sections. */
5730 if ((o
->flags
& SEC_LINKER_CREATED
)
5731 || (o
->flags
& SEC_DEBUGGING
))
5737 /* Skip sweeping sections already excluded. */
5738 if (o
->flags
& SEC_EXCLUDE
)
5741 /* Since this is early in the link process, it is simple
5742 to remove a section from the output. */
5743 o
->flags
|= SEC_EXCLUDE
;
5745 /* But we also have to update some of the relocation
5746 info we collected before. */
5748 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5750 Elf_Internal_Rela
*internal_relocs
;
5753 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5754 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
5755 if (internal_relocs
== NULL
)
5758 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
5760 if (!info
->keep_memory
)
5761 free (internal_relocs
);
5769 /* Remove the symbols that were in the swept sections from the dynamic
5770 symbol table. GCFIXME: Anyone know how to get them out of the
5771 static symbol table as well? */
5775 elf_link_hash_traverse (elf_hash_table (info
),
5776 elf_gc_sweep_symbol
,
5779 elf_hash_table (info
)->dynsymcount
= i
;
5785 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
5788 elf_gc_sweep_symbol (h
, idxptr
)
5789 struct elf_link_hash_entry
*h
;
5792 int *idx
= (int *) idxptr
;
5794 if (h
->dynindx
!= -1
5795 && ((h
->root
.type
!= bfd_link_hash_defined
5796 && h
->root
.type
!= bfd_link_hash_defweak
)
5797 || h
->root
.u
.def
.section
->gc_mark
))
5798 h
->dynindx
= (*idx
)++;
5803 /* Propogate collected vtable information. This is called through
5804 elf_link_hash_traverse. */
5807 elf_gc_propagate_vtable_entries_used (h
, okp
)
5808 struct elf_link_hash_entry
*h
;
5811 /* Those that are not vtables. */
5812 if (h
->vtable_parent
== NULL
)
5815 /* Those vtables that do not have parents, we cannot merge. */
5816 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
5819 /* If we've already been done, exit. */
5820 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
5823 /* Make sure the parent's table is up to date. */
5824 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
5826 if (h
->vtable_entries_used
== NULL
)
5828 /* None of this table's entries were referenced. Re-use the
5830 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
5831 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
5838 /* Or the parent's entries into ours. */
5839 cu
= h
->vtable_entries_used
;
5841 pu
= h
->vtable_parent
->vtable_entries_used
;
5844 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
5847 if (*pu
) *cu
= true;
5857 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
5858 struct elf_link_hash_entry
*h
;
5862 bfd_vma hstart
, hend
;
5863 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
5865 /* Take care of both those symbols that do not describe vtables as
5866 well as those that are not loaded. */
5867 if (h
->vtable_parent
== NULL
)
5870 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5871 || h
->root
.type
== bfd_link_hash_defweak
);
5873 sec
= h
->root
.u
.def
.section
;
5874 hstart
= h
->root
.u
.def
.value
;
5875 hend
= hstart
+ h
->size
;
5877 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5878 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
5880 return *(boolean
*)okp
= false;
5881 relend
= relstart
+ sec
->reloc_count
;
5883 for (rel
= relstart
; rel
< relend
; ++rel
)
5884 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
5886 /* If the entry is in use, do nothing. */
5887 if (h
->vtable_entries_used
5888 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
5890 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
5891 if (h
->vtable_entries_used
[entry
])
5894 /* Otherwise, kill it. */
5895 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
5901 /* Do mark and sweep of unused sections. */
5904 elf_gc_sections (abfd
, info
)
5906 struct bfd_link_info
*info
;
5910 asection
* (*gc_mark_hook
)
5911 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
5912 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
5914 if (!get_elf_backend_data (abfd
)->can_gc_sections
5915 || info
->relocateable
5916 || elf_hash_table (info
)->dynamic_sections_created
)
5919 /* Apply transitive closure to the vtable entry usage info. */
5920 elf_link_hash_traverse (elf_hash_table (info
),
5921 elf_gc_propagate_vtable_entries_used
,
5926 /* Kill the vtable relocations that were not used. */
5927 elf_link_hash_traverse (elf_hash_table (info
),
5928 elf_gc_smash_unused_vtentry_relocs
,
5933 /* Grovel through relocs to find out who stays ... */
5935 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
5936 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5939 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5941 if (o
->flags
& SEC_KEEP
)
5942 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
5947 /* ... and mark SEC_EXCLUDE for those that go. */
5948 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
5954 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
5957 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
5960 struct elf_link_hash_entry
*h
;
5963 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
5964 struct elf_link_hash_entry
**search
, *child
;
5965 bfd_size_type extsymcount
;
5967 /* The sh_info field of the symtab header tells us where the
5968 external symbols start. We don't care about the local symbols at
5970 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
5971 if (!elf_bad_symtab (abfd
))
5972 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5974 sym_hashes
= elf_sym_hashes (abfd
);
5975 sym_hashes_end
= sym_hashes
+ extsymcount
;
5977 /* Hunt down the child symbol, which is in this section at the same
5978 offset as the relocation. */
5979 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
5981 if ((child
= *search
) != NULL
5982 && (child
->root
.type
== bfd_link_hash_defined
5983 || child
->root
.type
== bfd_link_hash_defweak
)
5984 && child
->root
.u
.def
.section
== sec
5985 && child
->root
.u
.def
.value
== offset
)
5989 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
5990 bfd_get_filename (abfd
), sec
->name
,
5991 (unsigned long)offset
);
5992 bfd_set_error (bfd_error_invalid_operation
);
5998 /* This *should* only be the absolute section. It could potentially
5999 be that someone has defined a non-global vtable though, which
6000 would be bad. It isn't worth paging in the local symbols to be
6001 sure though; that case should simply be handled by the assembler. */
6003 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6006 child
->vtable_parent
= h
;
6011 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6014 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6017 struct elf_link_hash_entry
*h
;
6020 if (addend
>= h
->vtable_entries_size
)
6023 boolean
*ptr
= h
->vtable_entries_used
;
6025 /* While the symbol is undefined, we have to be prepared to handle
6027 if (h
->root
.type
== bfd_link_hash_undefined
)
6034 /* Oops! We've got a reference past the defined end of
6035 the table. This is probably a bug -- shall we warn? */
6040 /* Allocate one extra entry for use as a "done" flag for the
6041 consolidation pass. */
6042 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
6048 ptr
= realloc (ptr
-1, bytes
);
6052 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof(boolean
);
6053 memset (ptr
+ oldbytes
, 0, bytes
- oldbytes
);
6057 ptr
= calloc (1, bytes
);
6062 /* And arrange for that done flag to be at index -1. */
6063 h
->vtable_entries_used
= ptr
+1;
6064 h
->vtable_entries_size
= size
;
6066 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6071 /* And an accompanying bit to work out final got entry offsets once
6072 we're done. Should be called from final_link. */
6075 elf_gc_common_finalize_got_offsets (abfd
, info
)
6077 struct bfd_link_info
*info
;
6080 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6083 /* The GOT offset is relative to the .got section, but the GOT header is
6084 put into the .got.plt section, if the backend uses it. */
6085 if (bed
->want_got_plt
)
6088 gotoff
= bed
->got_header_size
;
6090 /* Do the local .got entries first. */
6091 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6093 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6094 bfd_size_type j
, locsymcount
;
6095 Elf_Internal_Shdr
*symtab_hdr
;
6100 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6101 if (elf_bad_symtab (i
))
6102 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6104 locsymcount
= symtab_hdr
->sh_info
;
6106 for (j
= 0; j
< locsymcount
; ++j
)
6108 if (local_got
[j
] > 0)
6110 local_got
[j
] = gotoff
;
6111 gotoff
+= ARCH_SIZE
/ 8;
6114 local_got
[j
] = (bfd_vma
) -1;
6118 /* Then the global .got and .plt entries. */
6119 elf_link_hash_traverse (elf_hash_table (info
),
6120 elf_gc_allocate_got_offsets
,
6125 /* We need a special top-level link routine to convert got reference counts
6126 to real got offsets. */
6129 elf_gc_allocate_got_offsets (h
, offarg
)
6130 struct elf_link_hash_entry
*h
;
6133 bfd_vma
*off
= (bfd_vma
*) offarg
;
6135 if (h
->got
.refcount
> 0)
6137 h
->got
.offset
= off
[0];
6138 off
[0] += ARCH_SIZE
/ 8;
6141 h
->got
.offset
= (bfd_vma
) -1;
6146 /* Many folk need no more in the way of final link than this, once
6147 got entry reference counting is enabled. */
6150 elf_gc_common_final_link (abfd
, info
)
6152 struct bfd_link_info
*info
;
6154 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6157 /* Invoke the regular ELF backend linker to do all the work. */
6158 return elf_bfd_final_link (abfd
, info
);
6161 /* This function will be called though elf_link_hash_traverse to store
6162 all hash value of the exported symbols in an array. */
6165 elf_collect_hash_codes (h
, data
)
6166 struct elf_link_hash_entry
*h
;
6169 unsigned long **valuep
= (unsigned long **) data
;
6175 /* Ignore indirect symbols. These are added by the versioning code. */
6176 if (h
->dynindx
== -1)
6179 name
= h
->root
.root
.string
;
6180 p
= strchr (name
, ELF_VER_CHR
);
6183 alc
= bfd_malloc (p
- name
+ 1);
6184 memcpy (alc
, name
, p
- name
);
6185 alc
[p
- name
] = '\0';
6189 /* Compute the hash value. */
6190 ha
= bfd_elf_hash (name
);
6192 /* Store the found hash value in the array given as the argument. */
6195 /* And store it in the struct so that we can put it in the hash table
6197 h
->elf_hash_value
= ha
;