2 Copyright 1995, 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_collect_hash_codes
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
53 static boolean elf_link_read_relocs_from_section
54 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
55 static void elf_link_output_relocs
56 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
57 static boolean elf_link_size_reloc_section
58 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
59 static void elf_link_adjust_relocs
60 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
61 struct elf_link_hash_entry
**));
63 /* Given an ELF BFD, add symbols to the global hash table as
67 elf_bfd_link_add_symbols (abfd
, info
)
69 struct bfd_link_info
*info
;
71 switch (bfd_get_format (abfd
))
74 return elf_link_add_object_symbols (abfd
, info
);
76 return elf_link_add_archive_symbols (abfd
, info
);
78 bfd_set_error (bfd_error_wrong_format
);
83 /* Return true iff this is a non-common definition of a symbol. */
85 is_global_symbol_definition (abfd
, sym
)
86 bfd
* abfd ATTRIBUTE_UNUSED
;
87 Elf_Internal_Sym
* sym
;
89 /* Local symbols do not count, but target specific ones might. */
90 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
91 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
94 /* If the section is undefined, then so is the symbol. */
95 if (sym
->st_shndx
== SHN_UNDEF
)
98 /* If the symbol is defined in the common section, then
99 it is a common definition and so does not count. */
100 if (sym
->st_shndx
== SHN_COMMON
)
103 /* If the symbol is in a target specific section then we
104 must rely upon the backend to tell us what it is. */
105 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
106 /* FIXME - this function is not coded yet:
108 return _bfd_is_global_symbol_definition (abfd, sym);
110 Instead for now assume that the definition is not global,
111 Even if this is wrong, at least the linker will behave
112 in the same way that it used to do. */
119 /* Search the symbol table of the archive element of the archive ABFD
120 whoes archove map contains a mention of SYMDEF, and determine if
121 the symbol is defined in this element. */
123 elf_link_is_defined_archive_symbol (abfd
, symdef
)
127 Elf_Internal_Shdr
* hdr
;
128 Elf_External_Sym
* esym
;
129 Elf_External_Sym
* esymend
;
130 Elf_External_Sym
* buf
= NULL
;
134 boolean result
= false;
136 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
137 if (abfd
== (bfd
*) NULL
)
140 if (! bfd_check_format (abfd
, bfd_object
))
143 /* If we have already included the element containing this symbol in the
144 link then we do not need to include it again. Just claim that any symbol
145 it contains is not a definition, so that our caller will not decide to
146 (re)include this element. */
147 if (abfd
->archive_pass
)
150 /* Select the appropriate symbol table. */
151 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
152 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
154 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
156 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
158 /* The sh_info field of the symtab header tells us where the
159 external symbols start. We don't care about the local symbols. */
160 if (elf_bad_symtab (abfd
))
162 extsymcount
= symcount
;
167 extsymcount
= symcount
- hdr
->sh_info
;
168 extsymoff
= hdr
->sh_info
;
171 buf
= ((Elf_External_Sym
*)
172 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
173 if (buf
== NULL
&& extsymcount
!= 0)
176 /* Read in the symbol table.
177 FIXME: This ought to be cached somewhere. */
179 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
181 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
182 != extsymcount
* sizeof (Elf_External_Sym
)))
188 /* Scan the symbol table looking for SYMDEF. */
189 esymend
= buf
+ extsymcount
;
194 Elf_Internal_Sym sym
;
197 elf_swap_symbol_in (abfd
, esym
, & sym
);
199 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
200 if (name
== (const char *) NULL
)
203 if (strcmp (name
, symdef
->name
) == 0)
205 result
= is_global_symbol_definition (abfd
, & sym
);
216 /* Add symbols from an ELF archive file to the linker hash table. We
217 don't use _bfd_generic_link_add_archive_symbols because of a
218 problem which arises on UnixWare. The UnixWare libc.so is an
219 archive which includes an entry libc.so.1 which defines a bunch of
220 symbols. The libc.so archive also includes a number of other
221 object files, which also define symbols, some of which are the same
222 as those defined in libc.so.1. Correct linking requires that we
223 consider each object file in turn, and include it if it defines any
224 symbols we need. _bfd_generic_link_add_archive_symbols does not do
225 this; it looks through the list of undefined symbols, and includes
226 any object file which defines them. When this algorithm is used on
227 UnixWare, it winds up pulling in libc.so.1 early and defining a
228 bunch of symbols. This means that some of the other objects in the
229 archive are not included in the link, which is incorrect since they
230 precede libc.so.1 in the archive.
232 Fortunately, ELF archive handling is simpler than that done by
233 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
234 oddities. In ELF, if we find a symbol in the archive map, and the
235 symbol is currently undefined, we know that we must pull in that
238 Unfortunately, we do have to make multiple passes over the symbol
239 table until nothing further is resolved. */
242 elf_link_add_archive_symbols (abfd
, info
)
244 struct bfd_link_info
*info
;
247 boolean
*defined
= NULL
;
248 boolean
*included
= NULL
;
252 if (! bfd_has_map (abfd
))
254 /* An empty archive is a special case. */
255 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
257 bfd_set_error (bfd_error_no_armap
);
261 /* Keep track of all symbols we know to be already defined, and all
262 files we know to be already included. This is to speed up the
263 second and subsequent passes. */
264 c
= bfd_ardata (abfd
)->symdef_count
;
267 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
268 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
269 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
271 memset (defined
, 0, c
* sizeof (boolean
));
272 memset (included
, 0, c
* sizeof (boolean
));
274 symdefs
= bfd_ardata (abfd
)->symdefs
;
287 symdefend
= symdef
+ c
;
288 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
290 struct elf_link_hash_entry
*h
;
292 struct bfd_link_hash_entry
*undefs_tail
;
295 if (defined
[i
] || included
[i
])
297 if (symdef
->file_offset
== last
)
303 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
304 false, false, false);
310 /* If this is a default version (the name contains @@),
311 look up the symbol again without the version. The
312 effect is that references to the symbol without the
313 version will be matched by the default symbol in the
316 p
= strchr (symdef
->name
, ELF_VER_CHR
);
317 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
320 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
323 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
324 copy
[p
- symdef
->name
] = '\0';
326 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
327 false, false, false);
329 bfd_release (abfd
, copy
);
335 if (h
->root
.type
== bfd_link_hash_common
)
337 /* We currently have a common symbol. The archive map contains
338 a reference to this symbol, so we may want to include it. We
339 only want to include it however, if this archive element
340 contains a definition of the symbol, not just another common
343 Unfortunately some archivers (including GNU ar) will put
344 declarations of common symbols into their archive maps, as
345 well as real definitions, so we cannot just go by the archive
346 map alone. Instead we must read in the element's symbol
347 table and check that to see what kind of symbol definition
349 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
352 else if (h
->root
.type
!= bfd_link_hash_undefined
)
354 if (h
->root
.type
!= bfd_link_hash_undefweak
)
359 /* We need to include this archive member. */
361 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
362 if (element
== (bfd
*) NULL
)
365 if (! bfd_check_format (element
, bfd_object
))
368 /* Doublecheck that we have not included this object
369 already--it should be impossible, but there may be
370 something wrong with the archive. */
371 if (element
->archive_pass
!= 0)
373 bfd_set_error (bfd_error_bad_value
);
376 element
->archive_pass
= 1;
378 undefs_tail
= info
->hash
->undefs_tail
;
380 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
383 if (! elf_link_add_object_symbols (element
, info
))
386 /* If there are any new undefined symbols, we need to make
387 another pass through the archive in order to see whether
388 they can be defined. FIXME: This isn't perfect, because
389 common symbols wind up on undefs_tail and because an
390 undefined symbol which is defined later on in this pass
391 does not require another pass. This isn't a bug, but it
392 does make the code less efficient than it could be. */
393 if (undefs_tail
!= info
->hash
->undefs_tail
)
396 /* Look backward to mark all symbols from this object file
397 which we have already seen in this pass. */
401 included
[mark
] = true;
406 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
408 /* We mark subsequent symbols from this object file as we go
409 on through the loop. */
410 last
= symdef
->file_offset
;
421 if (defined
!= (boolean
*) NULL
)
423 if (included
!= (boolean
*) NULL
)
428 /* This function is called when we want to define a new symbol. It
429 handles the various cases which arise when we find a definition in
430 a dynamic object, or when there is already a definition in a
431 dynamic object. The new symbol is described by NAME, SYM, PSEC,
432 and PVALUE. We set SYM_HASH to the hash table entry. We set
433 OVERRIDE if the old symbol is overriding a new definition. We set
434 TYPE_CHANGE_OK if it is OK for the type to change. We set
435 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
436 change, we mean that we shouldn't warn if the type or size does
440 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
441 override
, type_change_ok
, size_change_ok
)
443 struct bfd_link_info
*info
;
445 Elf_Internal_Sym
*sym
;
448 struct elf_link_hash_entry
**sym_hash
;
450 boolean
*type_change_ok
;
451 boolean
*size_change_ok
;
454 struct elf_link_hash_entry
*h
;
457 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
462 bind
= ELF_ST_BIND (sym
->st_info
);
464 if (! bfd_is_und_section (sec
))
465 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
467 h
= ((struct elf_link_hash_entry
*)
468 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
473 /* This code is for coping with dynamic objects, and is only useful
474 if we are doing an ELF link. */
475 if (info
->hash
->creator
!= abfd
->xvec
)
478 /* For merging, we only care about real symbols. */
480 while (h
->root
.type
== bfd_link_hash_indirect
481 || h
->root
.type
== bfd_link_hash_warning
)
482 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
484 /* If we just created the symbol, mark it as being an ELF symbol.
485 Other than that, there is nothing to do--there is no merge issue
486 with a newly defined symbol--so we just return. */
488 if (h
->root
.type
== bfd_link_hash_new
)
490 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
494 /* OLDBFD is a BFD associated with the existing symbol. */
496 switch (h
->root
.type
)
502 case bfd_link_hash_undefined
:
503 case bfd_link_hash_undefweak
:
504 oldbfd
= h
->root
.u
.undef
.abfd
;
507 case bfd_link_hash_defined
:
508 case bfd_link_hash_defweak
:
509 oldbfd
= h
->root
.u
.def
.section
->owner
;
512 case bfd_link_hash_common
:
513 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
517 /* In cases involving weak versioned symbols, we may wind up trying
518 to merge a symbol with itself. Catch that here, to avoid the
519 confusion that results if we try to override a symbol with
520 itself. The additional tests catch cases like
521 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
522 dynamic object, which we do want to handle here. */
524 && ((abfd
->flags
& DYNAMIC
) == 0
525 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
528 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
529 respectively, is from a dynamic object. */
531 if ((abfd
->flags
& DYNAMIC
) != 0)
537 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
542 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
543 indices used by MIPS ELF. */
544 switch (h
->root
.type
)
550 case bfd_link_hash_defined
:
551 case bfd_link_hash_defweak
:
552 hsec
= h
->root
.u
.def
.section
;
555 case bfd_link_hash_common
:
556 hsec
= h
->root
.u
.c
.p
->section
;
563 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
566 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
567 respectively, appear to be a definition rather than reference. */
569 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
574 if (h
->root
.type
== bfd_link_hash_undefined
575 || h
->root
.type
== bfd_link_hash_undefweak
576 || h
->root
.type
== bfd_link_hash_common
)
581 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
582 symbol, respectively, appears to be a common symbol in a dynamic
583 object. If a symbol appears in an uninitialized section, and is
584 not weak, and is not a function, then it may be a common symbol
585 which was resolved when the dynamic object was created. We want
586 to treat such symbols specially, because they raise special
587 considerations when setting the symbol size: if the symbol
588 appears as a common symbol in a regular object, and the size in
589 the regular object is larger, we must make sure that we use the
590 larger size. This problematic case can always be avoided in C,
591 but it must be handled correctly when using Fortran shared
594 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
595 likewise for OLDDYNCOMMON and OLDDEF.
597 Note that this test is just a heuristic, and that it is quite
598 possible to have an uninitialized symbol in a shared object which
599 is really a definition, rather than a common symbol. This could
600 lead to some minor confusion when the symbol really is a common
601 symbol in some regular object. However, I think it will be
606 && (sec
->flags
& SEC_ALLOC
) != 0
607 && (sec
->flags
& SEC_LOAD
) == 0
610 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
613 newdyncommon
= false;
617 && h
->root
.type
== bfd_link_hash_defined
618 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
619 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
620 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
622 && h
->type
!= STT_FUNC
)
625 olddyncommon
= false;
627 /* It's OK to change the type if either the existing symbol or the
628 new symbol is weak. */
630 if (h
->root
.type
== bfd_link_hash_defweak
631 || h
->root
.type
== bfd_link_hash_undefweak
633 *type_change_ok
= true;
635 /* It's OK to change the size if either the existing symbol or the
636 new symbol is weak, or if the old symbol is undefined. */
639 || h
->root
.type
== bfd_link_hash_undefined
)
640 *size_change_ok
= true;
642 /* If both the old and the new symbols look like common symbols in a
643 dynamic object, set the size of the symbol to the larger of the
648 && sym
->st_size
!= h
->size
)
650 /* Since we think we have two common symbols, issue a multiple
651 common warning if desired. Note that we only warn if the
652 size is different. If the size is the same, we simply let
653 the old symbol override the new one as normally happens with
654 symbols defined in dynamic objects. */
656 if (! ((*info
->callbacks
->multiple_common
)
657 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
658 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
661 if (sym
->st_size
> h
->size
)
662 h
->size
= sym
->st_size
;
664 *size_change_ok
= true;
667 /* If we are looking at a dynamic object, and we have found a
668 definition, we need to see if the symbol was already defined by
669 some other object. If so, we want to use the existing
670 definition, and we do not want to report a multiple symbol
671 definition error; we do this by clobbering *PSEC to be
674 We treat a common symbol as a definition if the symbol in the
675 shared library is a function, since common symbols always
676 represent variables; this can cause confusion in principle, but
677 any such confusion would seem to indicate an erroneous program or
678 shared library. We also permit a common symbol in a regular
679 object to override a weak symbol in a shared object.
681 We prefer a non-weak definition in a shared library to a weak
682 definition in the executable. */
687 || (h
->root
.type
== bfd_link_hash_common
689 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
690 && (h
->root
.type
!= bfd_link_hash_defweak
691 || bind
== STB_WEAK
))
695 newdyncommon
= false;
697 *psec
= sec
= bfd_und_section_ptr
;
698 *size_change_ok
= true;
700 /* If we get here when the old symbol is a common symbol, then
701 we are explicitly letting it override a weak symbol or
702 function in a dynamic object, and we don't want to warn about
703 a type change. If the old symbol is a defined symbol, a type
704 change warning may still be appropriate. */
706 if (h
->root
.type
== bfd_link_hash_common
)
707 *type_change_ok
= true;
710 /* Handle the special case of an old common symbol merging with a
711 new symbol which looks like a common symbol in a shared object.
712 We change *PSEC and *PVALUE to make the new symbol look like a
713 common symbol, and let _bfd_generic_link_add_one_symbol will do
717 && h
->root
.type
== bfd_link_hash_common
)
721 newdyncommon
= false;
722 *pvalue
= sym
->st_size
;
723 *psec
= sec
= bfd_com_section_ptr
;
724 *size_change_ok
= true;
727 /* If the old symbol is from a dynamic object, and the new symbol is
728 a definition which is not from a dynamic object, then the new
729 symbol overrides the old symbol. Symbols from regular files
730 always take precedence over symbols from dynamic objects, even if
731 they are defined after the dynamic object in the link.
733 As above, we again permit a common symbol in a regular object to
734 override a definition in a shared object if the shared object
735 symbol is a function or is weak.
737 As above, we permit a non-weak definition in a shared object to
738 override a weak definition in a regular object. */
742 || (bfd_is_com_section (sec
)
743 && (h
->root
.type
== bfd_link_hash_defweak
744 || h
->type
== STT_FUNC
)))
747 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
749 || h
->root
.type
== bfd_link_hash_defweak
))
751 /* Change the hash table entry to undefined, and let
752 _bfd_generic_link_add_one_symbol do the right thing with the
755 h
->root
.type
= bfd_link_hash_undefined
;
756 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
757 *size_change_ok
= true;
760 olddyncommon
= false;
762 /* We again permit a type change when a common symbol may be
763 overriding a function. */
765 if (bfd_is_com_section (sec
))
766 *type_change_ok
= true;
768 /* This union may have been set to be non-NULL when this symbol
769 was seen in a dynamic object. We must force the union to be
770 NULL, so that it is correct for a regular symbol. */
772 h
->verinfo
.vertree
= NULL
;
774 /* In this special case, if H is the target of an indirection,
775 we want the caller to frob with H rather than with the
776 indirect symbol. That will permit the caller to redefine the
777 target of the indirection, rather than the indirect symbol
778 itself. FIXME: This will break the -y option if we store a
779 symbol with a different name. */
783 /* Handle the special case of a new common symbol merging with an
784 old symbol that looks like it might be a common symbol defined in
785 a shared object. Note that we have already handled the case in
786 which a new common symbol should simply override the definition
787 in the shared library. */
790 && bfd_is_com_section (sec
)
793 /* It would be best if we could set the hash table entry to a
794 common symbol, but we don't know what to use for the section
796 if (! ((*info
->callbacks
->multiple_common
)
797 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
798 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
801 /* If the predumed common symbol in the dynamic object is
802 larger, pretend that the new symbol has its size. */
804 if (h
->size
> *pvalue
)
807 /* FIXME: We no longer know the alignment required by the symbol
808 in the dynamic object, so we just wind up using the one from
809 the regular object. */
812 olddyncommon
= false;
814 h
->root
.type
= bfd_link_hash_undefined
;
815 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
817 *size_change_ok
= true;
818 *type_change_ok
= true;
820 h
->verinfo
.vertree
= NULL
;
823 /* Handle the special case of a weak definition in a regular object
824 followed by a non-weak definition in a shared object. In this
825 case, we prefer the definition in the shared object. */
827 && h
->root
.type
== bfd_link_hash_defweak
832 /* To make this work we have to frob the flags so that the rest
833 of the code does not think we are using the regular
835 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
836 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
837 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
838 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
839 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
840 | ELF_LINK_HASH_DEF_DYNAMIC
);
842 /* If H is the target of an indirection, we want the caller to
843 use H rather than the indirect symbol. Otherwise if we are
844 defining a new indirect symbol we will wind up attaching it
845 to the entry we are overriding. */
849 /* Handle the special case of a non-weak definition in a shared
850 object followed by a weak definition in a regular object. In
851 this case we prefer to definition in the shared object. To make
852 this work we have to tell the caller to not treat the new symbol
856 && h
->root
.type
!= bfd_link_hash_defweak
865 /* Add symbols from an ELF object file to the linker hash table. */
868 elf_link_add_object_symbols (abfd
, info
)
870 struct bfd_link_info
*info
;
872 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
873 const Elf_Internal_Sym
*,
874 const char **, flagword
*,
875 asection
**, bfd_vma
*));
876 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
877 asection
*, const Elf_Internal_Rela
*));
879 Elf_Internal_Shdr
*hdr
;
883 Elf_External_Sym
*buf
= NULL
;
884 struct elf_link_hash_entry
**sym_hash
;
886 bfd_byte
*dynver
= NULL
;
887 Elf_External_Versym
*extversym
= NULL
;
888 Elf_External_Versym
*ever
;
889 Elf_External_Dyn
*dynbuf
= NULL
;
890 struct elf_link_hash_entry
*weaks
;
891 Elf_External_Sym
*esym
;
892 Elf_External_Sym
*esymend
;
893 struct elf_backend_data
*bed
;
894 boolean visibility_changed
= false;
896 bed
= get_elf_backend_data (abfd
);
897 add_symbol_hook
= bed
->elf_add_symbol_hook
;
898 collect
= bed
->collect
;
900 if ((abfd
->flags
& DYNAMIC
) == 0)
906 /* You can't use -r against a dynamic object. Also, there's no
907 hope of using a dynamic object which does not exactly match
908 the format of the output file. */
909 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
911 bfd_set_error (bfd_error_invalid_operation
);
916 /* As a GNU extension, any input sections which are named
917 .gnu.warning.SYMBOL are treated as warning symbols for the given
918 symbol. This differs from .gnu.warning sections, which generate
919 warnings when they are included in an output file. */
924 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
928 name
= bfd_get_section_name (abfd
, s
);
929 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
934 name
+= sizeof ".gnu.warning." - 1;
936 /* If this is a shared object, then look up the symbol
937 in the hash table. If it is there, and it is already
938 been defined, then we will not be using the entry
939 from this shared object, so we don't need to warn.
940 FIXME: If we see the definition in a regular object
941 later on, we will warn, but we shouldn't. The only
942 fix is to keep track of what warnings we are supposed
943 to emit, and then handle them all at the end of the
945 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
947 struct elf_link_hash_entry
*h
;
949 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
952 /* FIXME: What about bfd_link_hash_common? */
954 && (h
->root
.type
== bfd_link_hash_defined
955 || h
->root
.type
== bfd_link_hash_defweak
))
957 /* We don't want to issue this warning. Clobber
958 the section size so that the warning does not
959 get copied into the output file. */
965 sz
= bfd_section_size (abfd
, s
);
966 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
970 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
975 if (! (_bfd_generic_link_add_one_symbol
976 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
977 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
980 if (! info
->relocateable
)
982 /* Clobber the section size so that the warning does
983 not get copied into the output file. */
990 /* If this is a dynamic object, we always link against the .dynsym
991 symbol table, not the .symtab symbol table. The dynamic linker
992 will only see the .dynsym symbol table, so there is no reason to
993 look at .symtab for a dynamic object. */
995 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
996 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
998 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1002 /* Read in any version definitions. */
1004 if (! _bfd_elf_slurp_version_tables (abfd
))
1007 /* Read in the symbol versions, but don't bother to convert them
1008 to internal format. */
1009 if (elf_dynversym (abfd
) != 0)
1011 Elf_Internal_Shdr
*versymhdr
;
1013 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1014 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
1015 if (extversym
== NULL
)
1017 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1018 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
1019 != versymhdr
->sh_size
))
1024 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1026 /* The sh_info field of the symtab header tells us where the
1027 external symbols start. We don't care about the local symbols at
1029 if (elf_bad_symtab (abfd
))
1031 extsymcount
= symcount
;
1036 extsymcount
= symcount
- hdr
->sh_info
;
1037 extsymoff
= hdr
->sh_info
;
1040 buf
= ((Elf_External_Sym
*)
1041 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
1042 if (buf
== NULL
&& extsymcount
!= 0)
1045 /* We store a pointer to the hash table entry for each external
1047 sym_hash
= ((struct elf_link_hash_entry
**)
1049 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
1050 if (sym_hash
== NULL
)
1052 elf_sym_hashes (abfd
) = sym_hash
;
1056 /* If we are creating a shared library, create all the dynamic
1057 sections immediately. We need to attach them to something,
1058 so we attach them to this BFD, provided it is the right
1059 format. FIXME: If there are no input BFD's of the same
1060 format as the output, we can't make a shared library. */
1062 && ! elf_hash_table (info
)->dynamic_sections_created
1063 && abfd
->xvec
== info
->hash
->creator
)
1065 if (! elf_link_create_dynamic_sections (abfd
, info
))
1074 bfd_size_type oldsize
;
1075 bfd_size_type strindex
;
1077 /* Find the name to use in a DT_NEEDED entry that refers to this
1078 object. If the object has a DT_SONAME entry, we use it.
1079 Otherwise, if the generic linker stuck something in
1080 elf_dt_name, we use that. Otherwise, we just use the file
1081 name. If the generic linker put a null string into
1082 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1083 there is a DT_SONAME entry. */
1085 name
= bfd_get_filename (abfd
);
1086 if (elf_dt_name (abfd
) != NULL
)
1088 name
= elf_dt_name (abfd
);
1092 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1095 Elf_External_Dyn
*extdyn
;
1096 Elf_External_Dyn
*extdynend
;
1100 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
1104 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1105 (file_ptr
) 0, s
->_raw_size
))
1108 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1111 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1114 /* The shared libraries distributed with hpux11 have a bogus
1115 sh_link field for the ".dynamic" section. This code detects
1116 when LINK refers to a section that is not a string table and
1117 tries to find the string table for the ".dynsym" section
1119 Elf_Internal_Shdr
*hdr
= elf_elfsections (abfd
)[link
];
1120 if (hdr
->sh_type
!= SHT_STRTAB
)
1122 asection
*s
= bfd_get_section_by_name (abfd
, ".dynsym");
1123 int elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1126 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1131 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1132 for (; extdyn
< extdynend
; extdyn
++)
1134 Elf_Internal_Dyn dyn
;
1136 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1137 if (dyn
.d_tag
== DT_SONAME
)
1139 name
= bfd_elf_string_from_elf_section (abfd
, link
,
1144 if (dyn
.d_tag
== DT_NEEDED
)
1146 struct bfd_link_needed_list
*n
, **pn
;
1149 n
= ((struct bfd_link_needed_list
*)
1150 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1151 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1153 if (n
== NULL
|| fnm
== NULL
)
1155 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1162 for (pn
= &elf_hash_table (info
)->needed
;
1174 /* We do not want to include any of the sections in a dynamic
1175 object in the output file. We hack by simply clobbering the
1176 list of sections in the BFD. This could be handled more
1177 cleanly by, say, a new section flag; the existing
1178 SEC_NEVER_LOAD flag is not the one we want, because that one
1179 still implies that the section takes up space in the output
1181 abfd
->sections
= NULL
;
1182 abfd
->section_count
= 0;
1184 /* If this is the first dynamic object found in the link, create
1185 the special sections required for dynamic linking. */
1186 if (! elf_hash_table (info
)->dynamic_sections_created
)
1188 if (! elf_link_create_dynamic_sections (abfd
, info
))
1194 /* Add a DT_NEEDED entry for this dynamic object. */
1195 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1196 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1198 if (strindex
== (bfd_size_type
) -1)
1201 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1204 Elf_External_Dyn
*dyncon
, *dynconend
;
1206 /* The hash table size did not change, which means that
1207 the dynamic object name was already entered. If we
1208 have already included this dynamic object in the
1209 link, just ignore it. There is no reason to include
1210 a particular dynamic object more than once. */
1211 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1213 BFD_ASSERT (sdyn
!= NULL
);
1215 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1216 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1218 for (; dyncon
< dynconend
; dyncon
++)
1220 Elf_Internal_Dyn dyn
;
1222 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1224 if (dyn
.d_tag
== DT_NEEDED
1225 && dyn
.d_un
.d_val
== strindex
)
1229 if (extversym
!= NULL
)
1236 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1240 /* Save the SONAME, if there is one, because sometimes the
1241 linker emulation code will need to know it. */
1243 name
= bfd_get_filename (abfd
);
1244 elf_dt_name (abfd
) = name
;
1248 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1250 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1251 != extsymcount
* sizeof (Elf_External_Sym
)))
1256 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1257 esymend
= buf
+ extsymcount
;
1260 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1262 Elf_Internal_Sym sym
;
1268 struct elf_link_hash_entry
*h
;
1270 boolean size_change_ok
, type_change_ok
;
1271 boolean new_weakdef
;
1272 unsigned int old_alignment
;
1274 elf_swap_symbol_in (abfd
, esym
, &sym
);
1276 flags
= BSF_NO_FLAGS
;
1278 value
= sym
.st_value
;
1281 bind
= ELF_ST_BIND (sym
.st_info
);
1282 if (bind
== STB_LOCAL
)
1284 /* This should be impossible, since ELF requires that all
1285 global symbols follow all local symbols, and that sh_info
1286 point to the first global symbol. Unfortunatealy, Irix 5
1290 else if (bind
== STB_GLOBAL
)
1292 if (sym
.st_shndx
!= SHN_UNDEF
1293 && sym
.st_shndx
!= SHN_COMMON
)
1298 else if (bind
== STB_WEAK
)
1302 /* Leave it up to the processor backend. */
1305 if (sym
.st_shndx
== SHN_UNDEF
)
1306 sec
= bfd_und_section_ptr
;
1307 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1309 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1311 sec
= bfd_abs_section_ptr
;
1312 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1315 else if (sym
.st_shndx
== SHN_ABS
)
1316 sec
= bfd_abs_section_ptr
;
1317 else if (sym
.st_shndx
== SHN_COMMON
)
1319 sec
= bfd_com_section_ptr
;
1320 /* What ELF calls the size we call the value. What ELF
1321 calls the value we call the alignment. */
1322 value
= sym
.st_size
;
1326 /* Leave it up to the processor backend. */
1329 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1330 if (name
== (const char *) NULL
)
1333 if (add_symbol_hook
)
1335 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1339 /* The hook function sets the name to NULL if this symbol
1340 should be skipped for some reason. */
1341 if (name
== (const char *) NULL
)
1345 /* Sanity check that all possibilities were handled. */
1346 if (sec
== (asection
*) NULL
)
1348 bfd_set_error (bfd_error_bad_value
);
1352 if (bfd_is_und_section (sec
)
1353 || bfd_is_com_section (sec
))
1358 size_change_ok
= false;
1359 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1361 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1363 Elf_Internal_Versym iver
;
1364 unsigned int vernum
= 0;
1369 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1370 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1372 /* If this is a hidden symbol, or if it is not version
1373 1, we append the version name to the symbol name.
1374 However, we do not modify a non-hidden absolute
1375 symbol, because it might be the version symbol
1376 itself. FIXME: What if it isn't? */
1377 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1378 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1381 int namelen
, newlen
;
1384 if (sym
.st_shndx
!= SHN_UNDEF
)
1386 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1388 (*_bfd_error_handler
)
1389 (_("%s: %s: invalid version %u (max %d)"),
1390 bfd_get_filename (abfd
), name
, vernum
,
1391 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1392 bfd_set_error (bfd_error_bad_value
);
1395 else if (vernum
> 1)
1397 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1403 /* We cannot simply test for the number of
1404 entries in the VERNEED section since the
1405 numbers for the needed versions do not start
1407 Elf_Internal_Verneed
*t
;
1410 for (t
= elf_tdata (abfd
)->verref
;
1414 Elf_Internal_Vernaux
*a
;
1416 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1418 if (a
->vna_other
== vernum
)
1420 verstr
= a
->vna_nodename
;
1429 (*_bfd_error_handler
)
1430 (_("%s: %s: invalid needed version %d"),
1431 bfd_get_filename (abfd
), name
, vernum
);
1432 bfd_set_error (bfd_error_bad_value
);
1437 namelen
= strlen (name
);
1438 newlen
= namelen
+ strlen (verstr
) + 2;
1439 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1442 newname
= (char *) bfd_alloc (abfd
, newlen
);
1443 if (newname
== NULL
)
1445 strcpy (newname
, name
);
1446 p
= newname
+ namelen
;
1448 /* If this is a defined non-hidden version symbol,
1449 we add another @ to the name. This indicates the
1450 default version of the symbol. */
1451 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1452 && sym
.st_shndx
!= SHN_UNDEF
)
1460 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1461 sym_hash
, &override
, &type_change_ok
,
1469 while (h
->root
.type
== bfd_link_hash_indirect
1470 || h
->root
.type
== bfd_link_hash_warning
)
1471 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1473 /* Remember the old alignment if this is a common symbol, so
1474 that we don't reduce the alignment later on. We can't
1475 check later, because _bfd_generic_link_add_one_symbol
1476 will set a default for the alignment which we want to
1478 if (h
->root
.type
== bfd_link_hash_common
)
1479 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1481 if (elf_tdata (abfd
)->verdef
!= NULL
1485 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1488 if (! (_bfd_generic_link_add_one_symbol
1489 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1490 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1494 while (h
->root
.type
== bfd_link_hash_indirect
1495 || h
->root
.type
== bfd_link_hash_warning
)
1496 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1499 new_weakdef
= false;
1502 && (flags
& BSF_WEAK
) != 0
1503 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1504 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1505 && h
->weakdef
== NULL
)
1507 /* Keep a list of all weak defined non function symbols from
1508 a dynamic object, using the weakdef field. Later in this
1509 function we will set the weakdef field to the correct
1510 value. We only put non-function symbols from dynamic
1511 objects on this list, because that happens to be the only
1512 time we need to know the normal symbol corresponding to a
1513 weak symbol, and the information is time consuming to
1514 figure out. If the weakdef field is not already NULL,
1515 then this symbol was already defined by some previous
1516 dynamic object, and we will be using that previous
1517 definition anyhow. */
1524 /* Set the alignment of a common symbol. */
1525 if (sym
.st_shndx
== SHN_COMMON
1526 && h
->root
.type
== bfd_link_hash_common
)
1530 align
= bfd_log2 (sym
.st_value
);
1531 if (align
> old_alignment
)
1532 h
->root
.u
.c
.p
->alignment_power
= align
;
1535 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1541 /* Remember the symbol size and type. */
1542 if (sym
.st_size
!= 0
1543 && (definition
|| h
->size
== 0))
1545 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1546 (*_bfd_error_handler
)
1547 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1548 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1549 bfd_get_filename (abfd
));
1551 h
->size
= sym
.st_size
;
1554 /* If this is a common symbol, then we always want H->SIZE
1555 to be the size of the common symbol. The code just above
1556 won't fix the size if a common symbol becomes larger. We
1557 don't warn about a size change here, because that is
1558 covered by --warn-common. */
1559 if (h
->root
.type
== bfd_link_hash_common
)
1560 h
->size
= h
->root
.u
.c
.size
;
1562 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1563 && (definition
|| h
->type
== STT_NOTYPE
))
1565 if (h
->type
!= STT_NOTYPE
1566 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1567 && ! type_change_ok
)
1568 (*_bfd_error_handler
)
1569 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1570 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1571 bfd_get_filename (abfd
));
1573 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1576 /* If st_other has a processor-specific meaning, specific code
1577 might be needed here. */
1578 if (sym
.st_other
!= 0)
1580 /* Combine visibilities, using the most constraining one. */
1581 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1582 unsigned char symvis
= ELF_ST_VISIBILITY (sym
.st_other
);
1584 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1586 visibility_changed
= true;
1587 h
->other
= sym
.st_other
;
1590 /* If neither has visibility, use the st_other of the
1591 definition. This is an arbitrary choice, since the
1592 other bits have no general meaning. */
1593 if (!symvis
&& !hvis
1594 && (definition
|| h
->other
== 0))
1595 h
->other
= sym
.st_other
;
1598 /* Set a flag in the hash table entry indicating the type of
1599 reference or definition we just found. Keep a count of
1600 the number of dynamic symbols we find. A dynamic symbol
1601 is one which is referenced or defined by both a regular
1602 object and a shared object. */
1603 old_flags
= h
->elf_link_hash_flags
;
1609 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1610 if (bind
!= STB_WEAK
)
1611 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1614 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1616 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1617 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1623 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1625 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1626 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1627 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1628 || (h
->weakdef
!= NULL
1630 && h
->weakdef
->dynindx
!= -1))
1634 h
->elf_link_hash_flags
|= new_flag
;
1636 /* If this symbol has a version, and it is the default
1637 version, we create an indirect symbol from the default
1638 name to the fully decorated name. This will cause
1639 external references which do not specify a version to be
1640 bound to this version of the symbol. */
1645 p
= strchr (name
, ELF_VER_CHR
);
1646 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1649 struct elf_link_hash_entry
*hi
;
1652 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1654 if (shortname
== NULL
)
1656 strncpy (shortname
, name
, p
- name
);
1657 shortname
[p
- name
] = '\0';
1659 /* We are going to create a new symbol. Merge it
1660 with any existing symbol with this name. For the
1661 purposes of the merge, act as though we were
1662 defining the symbol we just defined, although we
1663 actually going to define an indirect symbol. */
1664 type_change_ok
= false;
1665 size_change_ok
= false;
1666 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1667 &value
, &hi
, &override
,
1668 &type_change_ok
, &size_change_ok
))
1673 if (! (_bfd_generic_link_add_one_symbol
1674 (info
, abfd
, shortname
, BSF_INDIRECT
,
1675 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1676 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1681 /* In this case the symbol named SHORTNAME is
1682 overriding the indirect symbol we want to
1683 add. We were planning on making SHORTNAME an
1684 indirect symbol referring to NAME. SHORTNAME
1685 is the name without a version. NAME is the
1686 fully versioned name, and it is the default
1689 Overriding means that we already saw a
1690 definition for the symbol SHORTNAME in a
1691 regular object, and it is overriding the
1692 symbol defined in the dynamic object.
1694 When this happens, we actually want to change
1695 NAME, the symbol we just added, to refer to
1696 SHORTNAME. This will cause references to
1697 NAME in the shared object to become
1698 references to SHORTNAME in the regular
1699 object. This is what we expect when we
1700 override a function in a shared object: that
1701 the references in the shared object will be
1702 mapped to the definition in the regular
1705 while (hi
->root
.type
== bfd_link_hash_indirect
1706 || hi
->root
.type
== bfd_link_hash_warning
)
1707 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1709 h
->root
.type
= bfd_link_hash_indirect
;
1710 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1711 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1713 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1714 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1715 if (hi
->elf_link_hash_flags
1716 & (ELF_LINK_HASH_REF_REGULAR
1717 | ELF_LINK_HASH_DEF_REGULAR
))
1719 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1725 /* Now set HI to H, so that the following code
1726 will set the other fields correctly. */
1730 /* If there is a duplicate definition somewhere,
1731 then HI may not point to an indirect symbol. We
1732 will have reported an error to the user in that
1735 if (hi
->root
.type
== bfd_link_hash_indirect
)
1737 struct elf_link_hash_entry
*ht
;
1739 /* If the symbol became indirect, then we assume
1740 that we have not seen a definition before. */
1741 BFD_ASSERT ((hi
->elf_link_hash_flags
1742 & (ELF_LINK_HASH_DEF_DYNAMIC
1743 | ELF_LINK_HASH_DEF_REGULAR
))
1746 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1747 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1749 /* See if the new flags lead us to realize that
1750 the symbol must be dynamic. */
1756 || ((hi
->elf_link_hash_flags
1757 & ELF_LINK_HASH_REF_DYNAMIC
)
1763 if ((hi
->elf_link_hash_flags
1764 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1770 /* We also need to define an indirection from the
1771 nondefault version of the symbol. */
1773 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1775 if (shortname
== NULL
)
1777 strncpy (shortname
, name
, p
- name
);
1778 strcpy (shortname
+ (p
- name
), p
+ 1);
1780 /* Once again, merge with any existing symbol. */
1781 type_change_ok
= false;
1782 size_change_ok
= false;
1783 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1784 &value
, &hi
, &override
,
1785 &type_change_ok
, &size_change_ok
))
1790 /* Here SHORTNAME is a versioned name, so we
1791 don't expect to see the type of override we
1792 do in the case above. */
1793 (*_bfd_error_handler
)
1794 (_("%s: warning: unexpected redefinition of `%s'"),
1795 bfd_get_filename (abfd
), shortname
);
1799 if (! (_bfd_generic_link_add_one_symbol
1800 (info
, abfd
, shortname
, BSF_INDIRECT
,
1801 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1802 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1805 /* If there is a duplicate definition somewhere,
1806 then HI may not point to an indirect symbol.
1807 We will have reported an error to the user in
1810 if (hi
->root
.type
== bfd_link_hash_indirect
)
1812 /* If the symbol became indirect, then we
1813 assume that we have not seen a definition
1815 BFD_ASSERT ((hi
->elf_link_hash_flags
1816 & (ELF_LINK_HASH_DEF_DYNAMIC
1817 | ELF_LINK_HASH_DEF_REGULAR
))
1820 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1822 /* See if the new flags lead us to realize
1823 that the symbol must be dynamic. */
1829 || ((hi
->elf_link_hash_flags
1830 & ELF_LINK_HASH_REF_DYNAMIC
)
1836 if ((hi
->elf_link_hash_flags
1837 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1846 if (dynsym
&& h
->dynindx
== -1)
1848 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1850 if (h
->weakdef
!= NULL
1852 && h
->weakdef
->dynindx
== -1)
1854 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1859 else if (dynsym
&& h
->dynindx
!= -1 && visibility_changed
)
1860 /* If the symbol already has a dynamic index, but
1861 visibility says it should not be visible, turn it into
1863 switch (ELF_ST_VISIBILITY (h
->other
))
1867 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
1868 (*bed
->elf_backend_hide_symbol
) (h
);
1874 /* Now set the weakdefs field correctly for all the weak defined
1875 symbols we found. The only way to do this is to search all the
1876 symbols. Since we only need the information for non functions in
1877 dynamic objects, that's the only time we actually put anything on
1878 the list WEAKS. We need this information so that if a regular
1879 object refers to a symbol defined weakly in a dynamic object, the
1880 real symbol in the dynamic object is also put in the dynamic
1881 symbols; we also must arrange for both symbols to point to the
1882 same memory location. We could handle the general case of symbol
1883 aliasing, but a general symbol alias can only be generated in
1884 assembler code, handling it correctly would be very time
1885 consuming, and other ELF linkers don't handle general aliasing
1887 while (weaks
!= NULL
)
1889 struct elf_link_hash_entry
*hlook
;
1892 struct elf_link_hash_entry
**hpp
;
1893 struct elf_link_hash_entry
**hppend
;
1896 weaks
= hlook
->weakdef
;
1897 hlook
->weakdef
= NULL
;
1899 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1900 || hlook
->root
.type
== bfd_link_hash_defweak
1901 || hlook
->root
.type
== bfd_link_hash_common
1902 || hlook
->root
.type
== bfd_link_hash_indirect
);
1903 slook
= hlook
->root
.u
.def
.section
;
1904 vlook
= hlook
->root
.u
.def
.value
;
1906 hpp
= elf_sym_hashes (abfd
);
1907 hppend
= hpp
+ extsymcount
;
1908 for (; hpp
< hppend
; hpp
++)
1910 struct elf_link_hash_entry
*h
;
1913 if (h
!= NULL
&& h
!= hlook
1914 && h
->root
.type
== bfd_link_hash_defined
1915 && h
->root
.u
.def
.section
== slook
1916 && h
->root
.u
.def
.value
== vlook
)
1920 /* If the weak definition is in the list of dynamic
1921 symbols, make sure the real definition is put there
1923 if (hlook
->dynindx
!= -1
1924 && h
->dynindx
== -1)
1926 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1930 /* If the real definition is in the list of dynamic
1931 symbols, make sure the weak definition is put there
1932 as well. If we don't do this, then the dynamic
1933 loader might not merge the entries for the real
1934 definition and the weak definition. */
1935 if (h
->dynindx
!= -1
1936 && hlook
->dynindx
== -1)
1938 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1953 if (extversym
!= NULL
)
1959 /* If this object is the same format as the output object, and it is
1960 not a shared library, then let the backend look through the
1963 This is required to build global offset table entries and to
1964 arrange for dynamic relocs. It is not required for the
1965 particular common case of linking non PIC code, even when linking
1966 against shared libraries, but unfortunately there is no way of
1967 knowing whether an object file has been compiled PIC or not.
1968 Looking through the relocs is not particularly time consuming.
1969 The problem is that we must either (1) keep the relocs in memory,
1970 which causes the linker to require additional runtime memory or
1971 (2) read the relocs twice from the input file, which wastes time.
1972 This would be a good case for using mmap.
1974 I have no idea how to handle linking PIC code into a file of a
1975 different format. It probably can't be done. */
1976 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1978 && abfd
->xvec
== info
->hash
->creator
1979 && check_relocs
!= NULL
)
1983 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1985 Elf_Internal_Rela
*internal_relocs
;
1988 if ((o
->flags
& SEC_RELOC
) == 0
1989 || o
->reloc_count
== 0
1990 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1991 && (o
->flags
& SEC_DEBUGGING
) != 0)
1992 || bfd_is_abs_section (o
->output_section
))
1995 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1996 (abfd
, o
, (PTR
) NULL
,
1997 (Elf_Internal_Rela
*) NULL
,
1998 info
->keep_memory
));
1999 if (internal_relocs
== NULL
)
2002 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2004 if (! info
->keep_memory
)
2005 free (internal_relocs
);
2012 /* If this is a non-traditional, non-relocateable link, try to
2013 optimize the handling of the .stab/.stabstr sections. */
2015 && ! info
->relocateable
2016 && ! info
->traditional_format
2017 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2018 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2020 asection
*stab
, *stabstr
;
2022 stab
= bfd_get_section_by_name (abfd
, ".stab");
2025 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2027 if (stabstr
!= NULL
)
2029 struct bfd_elf_section_data
*secdata
;
2031 secdata
= elf_section_data (stab
);
2032 if (! _bfd_link_section_stabs (abfd
,
2033 &elf_hash_table (info
)->stab_info
,
2035 &secdata
->stab_info
))
2050 if (extversym
!= NULL
)
2055 /* Create some sections which will be filled in with dynamic linking
2056 information. ABFD is an input file which requires dynamic sections
2057 to be created. The dynamic sections take up virtual memory space
2058 when the final executable is run, so we need to create them before
2059 addresses are assigned to the output sections. We work out the
2060 actual contents and size of these sections later. */
2063 elf_link_create_dynamic_sections (abfd
, info
)
2065 struct bfd_link_info
*info
;
2068 register asection
*s
;
2069 struct elf_link_hash_entry
*h
;
2070 struct elf_backend_data
*bed
;
2072 if (elf_hash_table (info
)->dynamic_sections_created
)
2075 /* Make sure that all dynamic sections use the same input BFD. */
2076 if (elf_hash_table (info
)->dynobj
== NULL
)
2077 elf_hash_table (info
)->dynobj
= abfd
;
2079 abfd
= elf_hash_table (info
)->dynobj
;
2081 /* Note that we set the SEC_IN_MEMORY flag for all of these
2083 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2084 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2086 /* A dynamically linked executable has a .interp section, but a
2087 shared library does not. */
2090 s
= bfd_make_section (abfd
, ".interp");
2092 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2096 /* Create sections to hold version informations. These are removed
2097 if they are not needed. */
2098 s
= bfd_make_section (abfd
, ".gnu.version_d");
2100 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2101 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2104 s
= bfd_make_section (abfd
, ".gnu.version");
2106 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2107 || ! bfd_set_section_alignment (abfd
, s
, 1))
2110 s
= bfd_make_section (abfd
, ".gnu.version_r");
2112 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2113 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2116 s
= bfd_make_section (abfd
, ".dynsym");
2118 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2119 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2122 s
= bfd_make_section (abfd
, ".dynstr");
2124 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2127 /* Create a strtab to hold the dynamic symbol names. */
2128 if (elf_hash_table (info
)->dynstr
== NULL
)
2130 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
2131 if (elf_hash_table (info
)->dynstr
== NULL
)
2135 s
= bfd_make_section (abfd
, ".dynamic");
2137 || ! bfd_set_section_flags (abfd
, s
, flags
)
2138 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2141 /* The special symbol _DYNAMIC is always set to the start of the
2142 .dynamic section. This call occurs before we have processed the
2143 symbols for any dynamic object, so we don't have to worry about
2144 overriding a dynamic definition. We could set _DYNAMIC in a
2145 linker script, but we only want to define it if we are, in fact,
2146 creating a .dynamic section. We don't want to define it if there
2147 is no .dynamic section, since on some ELF platforms the start up
2148 code examines it to decide how to initialize the process. */
2150 if (! (_bfd_generic_link_add_one_symbol
2151 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2152 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2153 (struct bfd_link_hash_entry
**) &h
)))
2155 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2156 h
->type
= STT_OBJECT
;
2159 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2162 bed
= get_elf_backend_data (abfd
);
2164 s
= bfd_make_section (abfd
, ".hash");
2166 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2167 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2169 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2171 /* Let the backend create the rest of the sections. This lets the
2172 backend set the right flags. The backend will normally create
2173 the .got and .plt sections. */
2174 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2177 elf_hash_table (info
)->dynamic_sections_created
= true;
2182 /* Add an entry to the .dynamic table. */
2185 elf_add_dynamic_entry (info
, tag
, val
)
2186 struct bfd_link_info
*info
;
2190 Elf_Internal_Dyn dyn
;
2194 bfd_byte
*newcontents
;
2196 dynobj
= elf_hash_table (info
)->dynobj
;
2198 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2199 BFD_ASSERT (s
!= NULL
);
2201 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2202 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2203 if (newcontents
== NULL
)
2207 dyn
.d_un
.d_val
= val
;
2208 elf_swap_dyn_out (dynobj
, &dyn
,
2209 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2211 s
->_raw_size
= newsize
;
2212 s
->contents
= newcontents
;
2217 /* Record a new local dynamic symbol. */
2220 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2221 struct bfd_link_info
*info
;
2225 struct elf_link_local_dynamic_entry
*entry
;
2226 struct elf_link_hash_table
*eht
;
2227 struct bfd_strtab_hash
*dynstr
;
2228 Elf_External_Sym esym
;
2229 unsigned long dynstr_index
;
2232 /* See if the entry exists already. */
2233 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2234 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2237 entry
= (struct elf_link_local_dynamic_entry
*)
2238 bfd_alloc (input_bfd
, sizeof (*entry
));
2242 /* Go find the symbol, so that we can find it's name. */
2243 if (bfd_seek (input_bfd
,
2244 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2245 + input_indx
* sizeof (Elf_External_Sym
)),
2247 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2248 != sizeof (Elf_External_Sym
)))
2250 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2252 name
= (bfd_elf_string_from_elf_section
2253 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2254 entry
->isym
.st_name
));
2256 dynstr
= elf_hash_table (info
)->dynstr
;
2259 /* Create a strtab to hold the dynamic symbol names. */
2260 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2265 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2266 if (dynstr_index
== (unsigned long) -1)
2268 entry
->isym
.st_name
= dynstr_index
;
2270 eht
= elf_hash_table (info
);
2272 entry
->next
= eht
->dynlocal
;
2273 eht
->dynlocal
= entry
;
2274 entry
->input_bfd
= input_bfd
;
2275 entry
->input_indx
= input_indx
;
2278 /* Whatever binding the symbol had before, it's now local. */
2280 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2282 /* The dynindx will be set at the end of size_dynamic_sections. */
2288 /* Read and swap the relocs from the section indicated by SHDR. This
2289 may be either a REL or a RELA section. The relocations are
2290 translated into RELA relocations and stored in INTERNAL_RELOCS,
2291 which should have already been allocated to contain enough space.
2292 The EXTERNAL_RELOCS are a buffer where the external form of the
2293 relocations should be stored.
2295 Returns false if something goes wrong. */
2298 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2301 Elf_Internal_Shdr
*shdr
;
2302 PTR external_relocs
;
2303 Elf_Internal_Rela
*internal_relocs
;
2305 struct elf_backend_data
*bed
;
2307 /* If there aren't any relocations, that's OK. */
2311 /* Position ourselves at the start of the section. */
2312 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2315 /* Read the relocations. */
2316 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2320 bed
= get_elf_backend_data (abfd
);
2322 /* Convert the external relocations to the internal format. */
2323 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2325 Elf_External_Rel
*erel
;
2326 Elf_External_Rel
*erelend
;
2327 Elf_Internal_Rela
*irela
;
2328 Elf_Internal_Rel
*irel
;
2330 erel
= (Elf_External_Rel
*) external_relocs
;
2331 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2332 irela
= internal_relocs
;
2333 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2334 * sizeof (Elf_Internal_Rel
)));
2335 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2339 if (bed
->s
->swap_reloc_in
)
2340 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2342 elf_swap_reloc_in (abfd
, erel
, irel
);
2344 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2346 irela
[i
].r_offset
= irel
[i
].r_offset
;
2347 irela
[i
].r_info
= irel
[i
].r_info
;
2348 irela
[i
].r_addend
= 0;
2354 Elf_External_Rela
*erela
;
2355 Elf_External_Rela
*erelaend
;
2356 Elf_Internal_Rela
*irela
;
2358 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2360 erela
= (Elf_External_Rela
*) external_relocs
;
2361 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2362 irela
= internal_relocs
;
2363 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2365 if (bed
->s
->swap_reloca_in
)
2366 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2368 elf_swap_reloca_in (abfd
, erela
, irela
);
2375 /* Read and swap the relocs for a section O. They may have been
2376 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2377 not NULL, they are used as buffers to read into. They are known to
2378 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2379 the return value is allocated using either malloc or bfd_alloc,
2380 according to the KEEP_MEMORY argument. If O has two relocation
2381 sections (both REL and RELA relocations), then the REL_HDR
2382 relocations will appear first in INTERNAL_RELOCS, followed by the
2383 REL_HDR2 relocations. */
2386 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2390 PTR external_relocs
;
2391 Elf_Internal_Rela
*internal_relocs
;
2392 boolean keep_memory
;
2394 Elf_Internal_Shdr
*rel_hdr
;
2396 Elf_Internal_Rela
*alloc2
= NULL
;
2397 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2399 if (elf_section_data (o
)->relocs
!= NULL
)
2400 return elf_section_data (o
)->relocs
;
2402 if (o
->reloc_count
== 0)
2405 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2407 if (internal_relocs
== NULL
)
2411 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2412 * sizeof (Elf_Internal_Rela
));
2414 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2416 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2417 if (internal_relocs
== NULL
)
2421 if (external_relocs
== NULL
)
2423 size_t size
= (size_t) rel_hdr
->sh_size
;
2425 if (elf_section_data (o
)->rel_hdr2
)
2426 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2427 alloc1
= (PTR
) bfd_malloc (size
);
2430 external_relocs
= alloc1
;
2433 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2437 if (!elf_link_read_relocs_from_section
2439 elf_section_data (o
)->rel_hdr2
,
2440 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2441 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2442 * bed
->s
->int_rels_per_ext_rel
)))
2445 /* Cache the results for next time, if we can. */
2447 elf_section_data (o
)->relocs
= internal_relocs
;
2452 /* Don't free alloc2, since if it was allocated we are passing it
2453 back (under the name of internal_relocs). */
2455 return internal_relocs
;
2466 /* Record an assignment to a symbol made by a linker script. We need
2467 this in case some dynamic object refers to this symbol. */
2471 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2472 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2473 struct bfd_link_info
*info
;
2477 struct elf_link_hash_entry
*h
;
2479 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2482 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2486 if (h
->root
.type
== bfd_link_hash_new
)
2487 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2489 /* If this symbol is being provided by the linker script, and it is
2490 currently defined by a dynamic object, but not by a regular
2491 object, then mark it as undefined so that the generic linker will
2492 force the correct value. */
2494 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2495 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2496 h
->root
.type
= bfd_link_hash_undefined
;
2498 /* If this symbol is not being provided by the linker script, and it is
2499 currently defined by a dynamic object, but not by a regular object,
2500 then clear out any version information because the symbol will not be
2501 associated with the dynamic object any more. */
2503 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2504 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2505 h
->verinfo
.verdef
= NULL
;
2507 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2509 /* When possible, keep the original type of the symbol */
2510 if (h
->type
== STT_NOTYPE
)
2511 h
->type
= STT_OBJECT
;
2513 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2514 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2516 && h
->dynindx
== -1)
2518 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2521 /* If this is a weak defined symbol, and we know a corresponding
2522 real symbol from the same dynamic object, make sure the real
2523 symbol is also made into a dynamic symbol. */
2524 if (h
->weakdef
!= NULL
2525 && h
->weakdef
->dynindx
== -1)
2527 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2535 /* This structure is used to pass information to
2536 elf_link_assign_sym_version. */
2538 struct elf_assign_sym_version_info
2542 /* General link information. */
2543 struct bfd_link_info
*info
;
2545 struct bfd_elf_version_tree
*verdefs
;
2546 /* Whether we are exporting all dynamic symbols. */
2547 boolean export_dynamic
;
2548 /* Whether we had a failure. */
2552 /* This structure is used to pass information to
2553 elf_link_find_version_dependencies. */
2555 struct elf_find_verdep_info
2559 /* General link information. */
2560 struct bfd_link_info
*info
;
2561 /* The number of dependencies. */
2563 /* Whether we had a failure. */
2567 /* Array used to determine the number of hash table buckets to use
2568 based on the number of symbols there are. If there are fewer than
2569 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2570 fewer than 37 we use 17 buckets, and so forth. We never use more
2571 than 32771 buckets. */
2573 static const size_t elf_buckets
[] =
2575 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2579 /* Compute bucket count for hashing table. We do not use a static set
2580 of possible tables sizes anymore. Instead we determine for all
2581 possible reasonable sizes of the table the outcome (i.e., the
2582 number of collisions etc) and choose the best solution. The
2583 weighting functions are not too simple to allow the table to grow
2584 without bounds. Instead one of the weighting factors is the size.
2585 Therefore the result is always a good payoff between few collisions
2586 (= short chain lengths) and table size. */
2588 compute_bucket_count (info
)
2589 struct bfd_link_info
*info
;
2591 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2592 size_t best_size
= 0;
2593 unsigned long int *hashcodes
;
2594 unsigned long int *hashcodesp
;
2595 unsigned long int i
;
2597 /* Compute the hash values for all exported symbols. At the same
2598 time store the values in an array so that we could use them for
2600 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2601 * sizeof (unsigned long int));
2602 if (hashcodes
== NULL
)
2604 hashcodesp
= hashcodes
;
2606 /* Put all hash values in HASHCODES. */
2607 elf_link_hash_traverse (elf_hash_table (info
),
2608 elf_collect_hash_codes
, &hashcodesp
);
2610 /* We have a problem here. The following code to optimize the table
2611 size requires an integer type with more the 32 bits. If
2612 BFD_HOST_U_64_BIT is set we know about such a type. */
2613 #ifdef BFD_HOST_U_64_BIT
2614 if (info
->optimize
== true)
2616 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2619 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2620 unsigned long int *counts
;
2622 /* Possible optimization parameters: if we have NSYMS symbols we say
2623 that the hashing table must at least have NSYMS/4 and at most
2625 minsize
= nsyms
/ 4;
2628 best_size
= maxsize
= nsyms
* 2;
2630 /* Create array where we count the collisions in. We must use bfd_malloc
2631 since the size could be large. */
2632 counts
= (unsigned long int *) bfd_malloc (maxsize
2633 * sizeof (unsigned long int));
2640 /* Compute the "optimal" size for the hash table. The criteria is a
2641 minimal chain length. The minor criteria is (of course) the size
2643 for (i
= minsize
; i
< maxsize
; ++i
)
2645 /* Walk through the array of hashcodes and count the collisions. */
2646 BFD_HOST_U_64_BIT max
;
2647 unsigned long int j
;
2648 unsigned long int fact
;
2650 memset (counts
, '\0', i
* sizeof (unsigned long int));
2652 /* Determine how often each hash bucket is used. */
2653 for (j
= 0; j
< nsyms
; ++j
)
2654 ++counts
[hashcodes
[j
] % i
];
2656 /* For the weight function we need some information about the
2657 pagesize on the target. This is information need not be 100%
2658 accurate. Since this information is not available (so far) we
2659 define it here to a reasonable default value. If it is crucial
2660 to have a better value some day simply define this value. */
2661 # ifndef BFD_TARGET_PAGESIZE
2662 # define BFD_TARGET_PAGESIZE (4096)
2665 /* We in any case need 2 + NSYMS entries for the size values and
2667 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2670 /* Variant 1: optimize for short chains. We add the squares
2671 of all the chain lengths (which favous many small chain
2672 over a few long chains). */
2673 for (j
= 0; j
< i
; ++j
)
2674 max
+= counts
[j
] * counts
[j
];
2676 /* This adds penalties for the overall size of the table. */
2677 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2680 /* Variant 2: Optimize a lot more for small table. Here we
2681 also add squares of the size but we also add penalties for
2682 empty slots (the +1 term). */
2683 for (j
= 0; j
< i
; ++j
)
2684 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2686 /* The overall size of the table is considered, but not as
2687 strong as in variant 1, where it is squared. */
2688 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2692 /* Compare with current best results. */
2693 if (max
< best_chlen
)
2703 #endif /* defined (BFD_HOST_U_64_BIT) */
2705 /* This is the fallback solution if no 64bit type is available or if we
2706 are not supposed to spend much time on optimizations. We select the
2707 bucket count using a fixed set of numbers. */
2708 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2710 best_size
= elf_buckets
[i
];
2711 if (dynsymcount
< elf_buckets
[i
+ 1])
2716 /* Free the arrays we needed. */
2722 /* Set up the sizes and contents of the ELF dynamic sections. This is
2723 called by the ELF linker emulation before_allocation routine. We
2724 must set the sizes of the sections before the linker sets the
2725 addresses of the various sections. */
2728 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2729 export_dynamic
, filter_shlib
,
2730 auxiliary_filters
, info
, sinterpptr
,
2735 boolean export_dynamic
;
2736 const char *filter_shlib
;
2737 const char * const *auxiliary_filters
;
2738 struct bfd_link_info
*info
;
2739 asection
**sinterpptr
;
2740 struct bfd_elf_version_tree
*verdefs
;
2742 bfd_size_type soname_indx
;
2744 struct elf_backend_data
*bed
;
2745 struct elf_assign_sym_version_info asvinfo
;
2749 soname_indx
= (bfd_size_type
) -1;
2751 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2754 /* The backend may have to create some sections regardless of whether
2755 we're dynamic or not. */
2756 bed
= get_elf_backend_data (output_bfd
);
2757 if (bed
->elf_backend_always_size_sections
2758 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2761 dynobj
= elf_hash_table (info
)->dynobj
;
2763 /* If there were no dynamic objects in the link, there is nothing to
2768 if (elf_hash_table (info
)->dynamic_sections_created
)
2770 struct elf_info_failed eif
;
2771 struct elf_link_hash_entry
*h
;
2772 bfd_size_type strsize
;
2774 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2775 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2779 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2780 soname
, true, true);
2781 if (soname_indx
== (bfd_size_type
) -1
2782 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2788 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2796 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2798 if (indx
== (bfd_size_type
) -1
2799 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2803 if (filter_shlib
!= NULL
)
2807 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2808 filter_shlib
, true, true);
2809 if (indx
== (bfd_size_type
) -1
2810 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2814 if (auxiliary_filters
!= NULL
)
2816 const char * const *p
;
2818 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2822 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2824 if (indx
== (bfd_size_type
) -1
2825 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2830 /* If we are supposed to export all symbols into the dynamic symbol
2831 table (this is not the normal case), then do so. */
2834 struct elf_info_failed eif
;
2838 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2844 /* Attach all the symbols to their version information. */
2845 asvinfo
.output_bfd
= output_bfd
;
2846 asvinfo
.info
= info
;
2847 asvinfo
.verdefs
= verdefs
;
2848 asvinfo
.export_dynamic
= export_dynamic
;
2849 asvinfo
.failed
= false;
2851 elf_link_hash_traverse (elf_hash_table (info
),
2852 elf_link_assign_sym_version
,
2857 /* Find all symbols which were defined in a dynamic object and make
2858 the backend pick a reasonable value for them. */
2861 elf_link_hash_traverse (elf_hash_table (info
),
2862 elf_adjust_dynamic_symbol
,
2867 /* Add some entries to the .dynamic section. We fill in some of the
2868 values later, in elf_bfd_final_link, but we must add the entries
2869 now so that we know the final size of the .dynamic section. */
2871 /* If there are initialization and/or finalization functions to
2872 call then add the corresponding DT_INIT/DT_FINI entries. */
2873 h
= (info
->init_function
2874 ? elf_link_hash_lookup (elf_hash_table (info
),
2875 info
->init_function
, false,
2879 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2880 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2882 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2885 h
= (info
->fini_function
2886 ? elf_link_hash_lookup (elf_hash_table (info
),
2887 info
->fini_function
, false,
2891 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2892 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2894 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2898 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2899 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2900 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2901 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2902 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2903 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2904 sizeof (Elf_External_Sym
)))
2908 /* The backend must work out the sizes of all the other dynamic
2910 if (bed
->elf_backend_size_dynamic_sections
2911 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2914 if (elf_hash_table (info
)->dynamic_sections_created
)
2918 size_t bucketcount
= 0;
2919 Elf_Internal_Sym isym
;
2920 size_t hash_entry_size
;
2922 /* Set up the version definition section. */
2923 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2924 BFD_ASSERT (s
!= NULL
);
2926 /* We may have created additional version definitions if we are
2927 just linking a regular application. */
2928 verdefs
= asvinfo
.verdefs
;
2930 if (verdefs
== NULL
)
2931 _bfd_strip_section_from_output (info
, s
);
2936 struct bfd_elf_version_tree
*t
;
2938 Elf_Internal_Verdef def
;
2939 Elf_Internal_Verdaux defaux
;
2944 /* Make space for the base version. */
2945 size
+= sizeof (Elf_External_Verdef
);
2946 size
+= sizeof (Elf_External_Verdaux
);
2949 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2951 struct bfd_elf_version_deps
*n
;
2953 size
+= sizeof (Elf_External_Verdef
);
2954 size
+= sizeof (Elf_External_Verdaux
);
2957 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2958 size
+= sizeof (Elf_External_Verdaux
);
2961 s
->_raw_size
= size
;
2962 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2963 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2966 /* Fill in the version definition section. */
2970 def
.vd_version
= VER_DEF_CURRENT
;
2971 def
.vd_flags
= VER_FLG_BASE
;
2974 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2975 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2976 + sizeof (Elf_External_Verdaux
));
2978 if (soname_indx
!= (bfd_size_type
) -1)
2980 def
.vd_hash
= bfd_elf_hash (soname
);
2981 defaux
.vda_name
= soname_indx
;
2988 name
= output_bfd
->filename
;
2989 def
.vd_hash
= bfd_elf_hash (name
);
2990 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2992 if (indx
== (bfd_size_type
) -1)
2994 defaux
.vda_name
= indx
;
2996 defaux
.vda_next
= 0;
2998 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2999 (Elf_External_Verdef
*)p
);
3000 p
+= sizeof (Elf_External_Verdef
);
3001 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3002 (Elf_External_Verdaux
*) p
);
3003 p
+= sizeof (Elf_External_Verdaux
);
3005 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3008 struct bfd_elf_version_deps
*n
;
3009 struct elf_link_hash_entry
*h
;
3012 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3015 /* Add a symbol representing this version. */
3017 if (! (_bfd_generic_link_add_one_symbol
3018 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3019 (bfd_vma
) 0, (const char *) NULL
, false,
3020 get_elf_backend_data (dynobj
)->collect
,
3021 (struct bfd_link_hash_entry
**) &h
)))
3023 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3024 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3025 h
->type
= STT_OBJECT
;
3026 h
->verinfo
.vertree
= t
;
3028 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3031 def
.vd_version
= VER_DEF_CURRENT
;
3033 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3034 def
.vd_flags
|= VER_FLG_WEAK
;
3035 def
.vd_ndx
= t
->vernum
+ 1;
3036 def
.vd_cnt
= cdeps
+ 1;
3037 def
.vd_hash
= bfd_elf_hash (t
->name
);
3038 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3039 if (t
->next
!= NULL
)
3040 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3041 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3045 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3046 (Elf_External_Verdef
*) p
);
3047 p
+= sizeof (Elf_External_Verdef
);
3049 defaux
.vda_name
= h
->dynstr_index
;
3050 if (t
->deps
== NULL
)
3051 defaux
.vda_next
= 0;
3053 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3054 t
->name_indx
= defaux
.vda_name
;
3056 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3057 (Elf_External_Verdaux
*) p
);
3058 p
+= sizeof (Elf_External_Verdaux
);
3060 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3062 if (n
->version_needed
== NULL
)
3064 /* This can happen if there was an error in the
3066 defaux
.vda_name
= 0;
3069 defaux
.vda_name
= n
->version_needed
->name_indx
;
3070 if (n
->next
== NULL
)
3071 defaux
.vda_next
= 0;
3073 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3075 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3076 (Elf_External_Verdaux
*) p
);
3077 p
+= sizeof (Elf_External_Verdaux
);
3081 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
3082 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
3085 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3088 /* Work out the size of the version reference section. */
3090 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3091 BFD_ASSERT (s
!= NULL
);
3093 struct elf_find_verdep_info sinfo
;
3095 sinfo
.output_bfd
= output_bfd
;
3097 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3098 if (sinfo
.vers
== 0)
3100 sinfo
.failed
= false;
3102 elf_link_hash_traverse (elf_hash_table (info
),
3103 elf_link_find_version_dependencies
,
3106 if (elf_tdata (output_bfd
)->verref
== NULL
)
3107 _bfd_strip_section_from_output (info
, s
);
3110 Elf_Internal_Verneed
*t
;
3115 /* Build the version definition section. */
3118 for (t
= elf_tdata (output_bfd
)->verref
;
3122 Elf_Internal_Vernaux
*a
;
3124 size
+= sizeof (Elf_External_Verneed
);
3126 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3127 size
+= sizeof (Elf_External_Vernaux
);
3130 s
->_raw_size
= size
;
3131 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
3132 if (s
->contents
== NULL
)
3136 for (t
= elf_tdata (output_bfd
)->verref
;
3141 Elf_Internal_Vernaux
*a
;
3145 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3148 t
->vn_version
= VER_NEED_CURRENT
;
3150 if (elf_dt_name (t
->vn_bfd
) != NULL
)
3151 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3152 elf_dt_name (t
->vn_bfd
),
3155 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3156 t
->vn_bfd
->filename
, true, false);
3157 if (indx
== (bfd_size_type
) -1)
3160 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3161 if (t
->vn_nextref
== NULL
)
3164 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3165 + caux
* sizeof (Elf_External_Vernaux
));
3167 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3168 (Elf_External_Verneed
*) p
);
3169 p
+= sizeof (Elf_External_Verneed
);
3171 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3173 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3174 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3175 a
->vna_nodename
, true, false);
3176 if (indx
== (bfd_size_type
) -1)
3179 if (a
->vna_nextptr
== NULL
)
3182 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3184 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3185 (Elf_External_Vernaux
*) p
);
3186 p
+= sizeof (Elf_External_Vernaux
);
3190 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3191 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3194 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3198 /* Assign dynsym indicies. In a shared library we generate a
3199 section symbol for each output section, which come first.
3200 Next come all of the back-end allocated local dynamic syms,
3201 followed by the rest of the global symbols. */
3203 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3205 /* Work out the size of the symbol version section. */
3206 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3207 BFD_ASSERT (s
!= NULL
);
3208 if (dynsymcount
== 0
3209 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3211 _bfd_strip_section_from_output (info
, s
);
3212 /* The DYNSYMCOUNT might have changed if we were going to
3213 output a dynamic symbol table entry for S. */
3214 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3218 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3219 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3220 if (s
->contents
== NULL
)
3223 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3227 /* Set the size of the .dynsym and .hash sections. We counted
3228 the number of dynamic symbols in elf_link_add_object_symbols.
3229 We will build the contents of .dynsym and .hash when we build
3230 the final symbol table, because until then we do not know the
3231 correct value to give the symbols. We built the .dynstr
3232 section as we went along in elf_link_add_object_symbols. */
3233 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3234 BFD_ASSERT (s
!= NULL
);
3235 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3236 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3237 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3240 /* The first entry in .dynsym is a dummy symbol. */
3247 elf_swap_symbol_out (output_bfd
, &isym
,
3248 (PTR
) (Elf_External_Sym
*) s
->contents
);
3250 /* Compute the size of the hashing table. As a side effect this
3251 computes the hash values for all the names we export. */
3252 bucketcount
= compute_bucket_count (info
);
3254 s
= bfd_get_section_by_name (dynobj
, ".hash");
3255 BFD_ASSERT (s
!= NULL
);
3256 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3257 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3258 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3259 if (s
->contents
== NULL
)
3261 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3263 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3264 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3265 s
->contents
+ hash_entry_size
);
3267 elf_hash_table (info
)->bucketcount
= bucketcount
;
3269 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3270 BFD_ASSERT (s
!= NULL
);
3271 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3273 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3280 /* Fix up the flags for a symbol. This handles various cases which
3281 can only be fixed after all the input files are seen. This is
3282 currently called by both adjust_dynamic_symbol and
3283 assign_sym_version, which is unnecessary but perhaps more robust in
3284 the face of future changes. */
3287 elf_fix_symbol_flags (h
, eif
)
3288 struct elf_link_hash_entry
*h
;
3289 struct elf_info_failed
*eif
;
3291 /* If this symbol was mentioned in a non-ELF file, try to set
3292 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3293 permit a non-ELF file to correctly refer to a symbol defined in
3294 an ELF dynamic object. */
3295 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3297 if (h
->root
.type
!= bfd_link_hash_defined
3298 && h
->root
.type
!= bfd_link_hash_defweak
)
3299 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3300 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3303 if (h
->root
.u
.def
.section
->owner
!= NULL
3304 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3305 == bfd_target_elf_flavour
))
3306 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3307 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3309 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3312 if (h
->dynindx
== -1
3313 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3314 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3316 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3325 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3326 was first seen in a non-ELF file. Fortunately, if the symbol
3327 was first seen in an ELF file, we're probably OK unless the
3328 symbol was defined in a non-ELF file. Catch that case here.
3329 FIXME: We're still in trouble if the symbol was first seen in
3330 a dynamic object, and then later in a non-ELF regular object. */
3331 if ((h
->root
.type
== bfd_link_hash_defined
3332 || h
->root
.type
== bfd_link_hash_defweak
)
3333 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3334 && (h
->root
.u
.def
.section
->owner
!= NULL
3335 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3336 != bfd_target_elf_flavour
)
3337 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3338 && (h
->elf_link_hash_flags
3339 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3340 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3343 /* If this is a final link, and the symbol was defined as a common
3344 symbol in a regular object file, and there was no definition in
3345 any dynamic object, then the linker will have allocated space for
3346 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3347 flag will not have been set. */
3348 if (h
->root
.type
== bfd_link_hash_defined
3349 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3350 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3351 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3352 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3353 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3355 /* If -Bsymbolic was used (which means to bind references to global
3356 symbols to the definition within the shared object), and this
3357 symbol was defined in a regular object, then it actually doesn't
3358 need a PLT entry. Likewise, if the symbol has any kind of
3359 visibility (internal, hidden, or protected), it doesn't need a
3361 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3362 && eif
->info
->shared
3363 && (eif
->info
->symbolic
|| ELF_ST_VISIBILITY (h
->other
))
3364 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3366 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3367 h
->plt
.offset
= (bfd_vma
) -1;
3370 /* If this is a weak defined symbol in a dynamic object, and we know
3371 the real definition in the dynamic object, copy interesting flags
3372 over to the real definition. */
3373 if (h
->weakdef
!= NULL
)
3375 struct elf_link_hash_entry
*weakdef
;
3377 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3378 || h
->root
.type
== bfd_link_hash_defweak
);
3379 weakdef
= h
->weakdef
;
3380 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3381 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3382 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3384 /* If the real definition is defined by a regular object file,
3385 don't do anything special. See the longer description in
3386 elf_adjust_dynamic_symbol, below. */
3387 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3390 weakdef
->elf_link_hash_flags
|=
3391 (h
->elf_link_hash_flags
3392 & (ELF_LINK_HASH_REF_REGULAR
3393 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3394 | ELF_LINK_NON_GOT_REF
));
3400 /* Make the backend pick a good value for a dynamic symbol. This is
3401 called via elf_link_hash_traverse, and also calls itself
3405 elf_adjust_dynamic_symbol (h
, data
)
3406 struct elf_link_hash_entry
*h
;
3409 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3411 struct elf_backend_data
*bed
;
3413 /* Ignore indirect symbols. These are added by the versioning code. */
3414 if (h
->root
.type
== bfd_link_hash_indirect
)
3417 /* Fix the symbol flags. */
3418 if (! elf_fix_symbol_flags (h
, eif
))
3421 /* If this symbol does not require a PLT entry, and it is not
3422 defined by a dynamic object, or is not referenced by a regular
3423 object, ignore it. We do have to handle a weak defined symbol,
3424 even if no regular object refers to it, if we decided to add it
3425 to the dynamic symbol table. FIXME: Do we normally need to worry
3426 about symbols which are defined by one dynamic object and
3427 referenced by another one? */
3428 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3429 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3430 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3431 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3432 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3434 h
->plt
.offset
= (bfd_vma
) -1;
3438 /* If we've already adjusted this symbol, don't do it again. This
3439 can happen via a recursive call. */
3440 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3443 /* Don't look at this symbol again. Note that we must set this
3444 after checking the above conditions, because we may look at a
3445 symbol once, decide not to do anything, and then get called
3446 recursively later after REF_REGULAR is set below. */
3447 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3449 /* If this is a weak definition, and we know a real definition, and
3450 the real symbol is not itself defined by a regular object file,
3451 then get a good value for the real definition. We handle the
3452 real symbol first, for the convenience of the backend routine.
3454 Note that there is a confusing case here. If the real definition
3455 is defined by a regular object file, we don't get the real symbol
3456 from the dynamic object, but we do get the weak symbol. If the
3457 processor backend uses a COPY reloc, then if some routine in the
3458 dynamic object changes the real symbol, we will not see that
3459 change in the corresponding weak symbol. This is the way other
3460 ELF linkers work as well, and seems to be a result of the shared
3463 I will clarify this issue. Most SVR4 shared libraries define the
3464 variable _timezone and define timezone as a weak synonym. The
3465 tzset call changes _timezone. If you write
3466 extern int timezone;
3468 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3469 you might expect that, since timezone is a synonym for _timezone,
3470 the same number will print both times. However, if the processor
3471 backend uses a COPY reloc, then actually timezone will be copied
3472 into your process image, and, since you define _timezone
3473 yourself, _timezone will not. Thus timezone and _timezone will
3474 wind up at different memory locations. The tzset call will set
3475 _timezone, leaving timezone unchanged. */
3477 if (h
->weakdef
!= NULL
)
3479 /* If we get to this point, we know there is an implicit
3480 reference by a regular object file via the weak symbol H.
3481 FIXME: Is this really true? What if the traversal finds
3482 H->WEAKDEF before it finds H? */
3483 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3485 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
3489 /* If a symbol has no type and no size and does not require a PLT
3490 entry, then we are probably about to do the wrong thing here: we
3491 are probably going to create a COPY reloc for an empty object.
3492 This case can arise when a shared object is built with assembly
3493 code, and the assembly code fails to set the symbol type. */
3495 && h
->type
== STT_NOTYPE
3496 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3497 (*_bfd_error_handler
)
3498 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3499 h
->root
.root
.string
);
3501 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3502 bed
= get_elf_backend_data (dynobj
);
3503 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3512 /* This routine is used to export all defined symbols into the dynamic
3513 symbol table. It is called via elf_link_hash_traverse. */
3516 elf_export_symbol (h
, data
)
3517 struct elf_link_hash_entry
*h
;
3520 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3522 /* Ignore indirect symbols. These are added by the versioning code. */
3523 if (h
->root
.type
== bfd_link_hash_indirect
)
3526 if (h
->dynindx
== -1
3527 && (h
->elf_link_hash_flags
3528 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3530 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3540 /* Look through the symbols which are defined in other shared
3541 libraries and referenced here. Update the list of version
3542 dependencies. This will be put into the .gnu.version_r section.
3543 This function is called via elf_link_hash_traverse. */
3546 elf_link_find_version_dependencies (h
, data
)
3547 struct elf_link_hash_entry
*h
;
3550 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3551 Elf_Internal_Verneed
*t
;
3552 Elf_Internal_Vernaux
*a
;
3554 /* We only care about symbols defined in shared objects with version
3556 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3557 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3559 || h
->verinfo
.verdef
== NULL
)
3562 /* See if we already know about this version. */
3563 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3565 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3568 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3569 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3575 /* This is a new version. Add it to tree we are building. */
3579 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3582 rinfo
->failed
= true;
3586 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3587 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3588 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3591 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3593 /* Note that we are copying a string pointer here, and testing it
3594 above. If bfd_elf_string_from_elf_section is ever changed to
3595 discard the string data when low in memory, this will have to be
3597 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3599 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3600 a
->vna_nextptr
= t
->vn_auxptr
;
3602 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3605 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3612 /* Figure out appropriate versions for all the symbols. We may not
3613 have the version number script until we have read all of the input
3614 files, so until that point we don't know which symbols should be
3615 local. This function is called via elf_link_hash_traverse. */
3618 elf_link_assign_sym_version (h
, data
)
3619 struct elf_link_hash_entry
*h
;
3622 struct elf_assign_sym_version_info
*sinfo
=
3623 (struct elf_assign_sym_version_info
*) data
;
3624 struct bfd_link_info
*info
= sinfo
->info
;
3625 struct elf_backend_data
*bed
;
3626 struct elf_info_failed eif
;
3629 /* Fix the symbol flags. */
3632 if (! elf_fix_symbol_flags (h
, &eif
))
3635 sinfo
->failed
= true;
3639 /* We only need version numbers for symbols defined in regular
3641 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3644 bed
= get_elf_backend_data (sinfo
->output_bfd
);
3645 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3646 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3648 struct bfd_elf_version_tree
*t
;
3653 /* There are two consecutive ELF_VER_CHR characters if this is
3654 not a hidden symbol. */
3656 if (*p
== ELF_VER_CHR
)
3662 /* If there is no version string, we can just return out. */
3666 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3670 /* Look for the version. If we find it, it is no longer weak. */
3671 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3673 if (strcmp (t
->name
, p
) == 0)
3677 struct bfd_elf_version_expr
*d
;
3679 len
= p
- h
->root
.root
.string
;
3680 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3683 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3684 alc
[len
- 1] = '\0';
3685 if (alc
[len
- 2] == ELF_VER_CHR
)
3686 alc
[len
- 2] = '\0';
3688 h
->verinfo
.vertree
= t
;
3692 if (t
->globals
!= NULL
)
3694 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3695 if ((*d
->match
) (d
, alc
))
3699 /* See if there is anything to force this symbol to
3701 if (d
== NULL
&& t
->locals
!= NULL
)
3703 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3705 if ((*d
->match
) (d
, alc
))
3707 if (h
->dynindx
!= -1
3709 && ! sinfo
->export_dynamic
)
3711 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3712 (*bed
->elf_backend_hide_symbol
) (h
);
3713 /* FIXME: The name of the symbol has
3714 already been recorded in the dynamic
3715 string table section. */
3723 bfd_release (sinfo
->output_bfd
, alc
);
3728 /* If we are building an application, we need to create a
3729 version node for this version. */
3730 if (t
== NULL
&& ! info
->shared
)
3732 struct bfd_elf_version_tree
**pp
;
3735 /* If we aren't going to export this symbol, we don't need
3736 to worry about it. */
3737 if (h
->dynindx
== -1)
3740 t
= ((struct bfd_elf_version_tree
*)
3741 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3744 sinfo
->failed
= true;
3753 t
->name_indx
= (unsigned int) -1;
3757 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3759 t
->vernum
= version_index
;
3763 h
->verinfo
.vertree
= t
;
3767 /* We could not find the version for a symbol when
3768 generating a shared archive. Return an error. */
3769 (*_bfd_error_handler
)
3770 (_("%s: undefined versioned symbol name %s"),
3771 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3772 bfd_set_error (bfd_error_bad_value
);
3773 sinfo
->failed
= true;
3778 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3781 /* If we don't have a version for this symbol, see if we can find
3783 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3785 struct bfd_elf_version_tree
*t
;
3786 struct bfd_elf_version_tree
*deflt
;
3787 struct bfd_elf_version_expr
*d
;
3789 /* See if can find what version this symbol is in. If the
3790 symbol is supposed to be local, then don't actually register
3793 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3795 if (t
->globals
!= NULL
)
3797 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3799 if ((*d
->match
) (d
, h
->root
.root
.string
))
3801 h
->verinfo
.vertree
= t
;
3810 if (t
->locals
!= NULL
)
3812 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3814 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3816 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3818 h
->verinfo
.vertree
= t
;
3819 if (h
->dynindx
!= -1
3821 && ! sinfo
->export_dynamic
)
3823 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3824 (*bed
->elf_backend_hide_symbol
) (h
);
3825 /* FIXME: The name of the symbol has already
3826 been recorded in the dynamic string table
3838 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3840 h
->verinfo
.vertree
= deflt
;
3841 if (h
->dynindx
!= -1
3843 && ! sinfo
->export_dynamic
)
3845 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3846 (*bed
->elf_backend_hide_symbol
) (h
);
3847 /* FIXME: The name of the symbol has already been
3848 recorded in the dynamic string table section. */
3856 /* Final phase of ELF linker. */
3858 /* A structure we use to avoid passing large numbers of arguments. */
3860 struct elf_final_link_info
3862 /* General link information. */
3863 struct bfd_link_info
*info
;
3866 /* Symbol string table. */
3867 struct bfd_strtab_hash
*symstrtab
;
3868 /* .dynsym section. */
3869 asection
*dynsym_sec
;
3870 /* .hash section. */
3872 /* symbol version section (.gnu.version). */
3873 asection
*symver_sec
;
3874 /* Buffer large enough to hold contents of any section. */
3876 /* Buffer large enough to hold external relocs of any section. */
3877 PTR external_relocs
;
3878 /* Buffer large enough to hold internal relocs of any section. */
3879 Elf_Internal_Rela
*internal_relocs
;
3880 /* Buffer large enough to hold external local symbols of any input
3882 Elf_External_Sym
*external_syms
;
3883 /* Buffer large enough to hold internal local symbols of any input
3885 Elf_Internal_Sym
*internal_syms
;
3886 /* Array large enough to hold a symbol index for each local symbol
3887 of any input BFD. */
3889 /* Array large enough to hold a section pointer for each local
3890 symbol of any input BFD. */
3891 asection
**sections
;
3892 /* Buffer to hold swapped out symbols. */
3893 Elf_External_Sym
*symbuf
;
3894 /* Number of swapped out symbols in buffer. */
3895 size_t symbuf_count
;
3896 /* Number of symbols which fit in symbuf. */
3900 static boolean elf_link_output_sym
3901 PARAMS ((struct elf_final_link_info
*, const char *,
3902 Elf_Internal_Sym
*, asection
*));
3903 static boolean elf_link_flush_output_syms
3904 PARAMS ((struct elf_final_link_info
*));
3905 static boolean elf_link_output_extsym
3906 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3907 static boolean elf_link_input_bfd
3908 PARAMS ((struct elf_final_link_info
*, bfd
*));
3909 static boolean elf_reloc_link_order
3910 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3911 struct bfd_link_order
*));
3913 /* This struct is used to pass information to elf_link_output_extsym. */
3915 struct elf_outext_info
3919 struct elf_final_link_info
*finfo
;
3922 /* Compute the size of, and allocate space for, REL_HDR which is the
3923 section header for a section containing relocations for O. */
3926 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
3928 Elf_Internal_Shdr
*rel_hdr
;
3931 register struct elf_link_hash_entry
**p
, **pend
;
3932 unsigned reloc_count
;
3934 /* Figure out how many relocations there will be. */
3935 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
3936 reloc_count
= elf_section_data (o
)->rel_count
;
3938 reloc_count
= elf_section_data (o
)->rel_count2
;
3940 /* That allows us to calculate the size of the section. */
3941 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
3943 /* The contents field must last into write_object_contents, so we
3944 allocate it with bfd_alloc rather than malloc. */
3945 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3946 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3949 /* We only allocate one set of hash entries, so we only do it the
3950 first time we are called. */
3951 if (elf_section_data (o
)->rel_hashes
== NULL
)
3953 p
= ((struct elf_link_hash_entry
**)
3954 bfd_malloc (o
->reloc_count
3955 * sizeof (struct elf_link_hash_entry
*)));
3956 if (p
== NULL
&& o
->reloc_count
!= 0)
3959 elf_section_data (o
)->rel_hashes
= p
;
3960 pend
= p
+ o
->reloc_count
;
3961 for (; p
< pend
; p
++)
3968 /* When performing a relocateable link, the input relocations are
3969 preserved. But, if they reference global symbols, the indices
3970 referenced must be updated. Update all the relocations in
3971 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
3974 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
3976 Elf_Internal_Shdr
*rel_hdr
;
3978 struct elf_link_hash_entry
**rel_hash
;
3982 for (i
= 0; i
< count
; i
++, rel_hash
++)
3984 if (*rel_hash
== NULL
)
3987 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3989 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3991 Elf_External_Rel
*erel
;
3992 Elf_Internal_Rel irel
;
3994 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3995 elf_swap_reloc_in (abfd
, erel
, &irel
);
3996 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3997 ELF_R_TYPE (irel
.r_info
));
3998 elf_swap_reloc_out (abfd
, &irel
, erel
);
4002 Elf_External_Rela
*erela
;
4003 Elf_Internal_Rela irela
;
4005 BFD_ASSERT (rel_hdr
->sh_entsize
4006 == sizeof (Elf_External_Rela
));
4008 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4009 elf_swap_reloca_in (abfd
, erela
, &irela
);
4010 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4011 ELF_R_TYPE (irela
.r_info
));
4012 elf_swap_reloca_out (abfd
, &irela
, erela
);
4017 /* Do the final step of an ELF link. */
4020 elf_bfd_final_link (abfd
, info
)
4022 struct bfd_link_info
*info
;
4026 struct elf_final_link_info finfo
;
4027 register asection
*o
;
4028 register struct bfd_link_order
*p
;
4030 size_t max_contents_size
;
4031 size_t max_external_reloc_size
;
4032 size_t max_internal_reloc_count
;
4033 size_t max_sym_count
;
4035 Elf_Internal_Sym elfsym
;
4037 Elf_Internal_Shdr
*symtab_hdr
;
4038 Elf_Internal_Shdr
*symstrtab_hdr
;
4039 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4040 struct elf_outext_info eoinfo
;
4043 abfd
->flags
|= DYNAMIC
;
4045 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4046 dynobj
= elf_hash_table (info
)->dynobj
;
4049 finfo
.output_bfd
= abfd
;
4050 finfo
.symstrtab
= elf_stringtab_init ();
4051 if (finfo
.symstrtab
== NULL
)
4056 finfo
.dynsym_sec
= NULL
;
4057 finfo
.hash_sec
= NULL
;
4058 finfo
.symver_sec
= NULL
;
4062 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4063 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4064 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4065 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4066 /* Note that it is OK if symver_sec is NULL. */
4069 finfo
.contents
= NULL
;
4070 finfo
.external_relocs
= NULL
;
4071 finfo
.internal_relocs
= NULL
;
4072 finfo
.external_syms
= NULL
;
4073 finfo
.internal_syms
= NULL
;
4074 finfo
.indices
= NULL
;
4075 finfo
.sections
= NULL
;
4076 finfo
.symbuf
= NULL
;
4077 finfo
.symbuf_count
= 0;
4079 /* Count up the number of relocations we will output for each output
4080 section, so that we know the sizes of the reloc sections. We
4081 also figure out some maximum sizes. */
4082 max_contents_size
= 0;
4083 max_external_reloc_size
= 0;
4084 max_internal_reloc_count
= 0;
4086 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4090 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4092 if (p
->type
== bfd_section_reloc_link_order
4093 || p
->type
== bfd_symbol_reloc_link_order
)
4095 else if (p
->type
== bfd_indirect_link_order
)
4099 sec
= p
->u
.indirect
.section
;
4101 /* Mark all sections which are to be included in the
4102 link. This will normally be every section. We need
4103 to do this so that we can identify any sections which
4104 the linker has decided to not include. */
4105 sec
->linker_mark
= true;
4107 if (info
->relocateable
)
4108 o
->reloc_count
+= sec
->reloc_count
;
4110 if (sec
->_raw_size
> max_contents_size
)
4111 max_contents_size
= sec
->_raw_size
;
4112 if (sec
->_cooked_size
> max_contents_size
)
4113 max_contents_size
= sec
->_cooked_size
;
4115 /* We are interested in just local symbols, not all
4117 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4118 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4122 if (elf_bad_symtab (sec
->owner
))
4123 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4124 / sizeof (Elf_External_Sym
));
4126 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4128 if (sym_count
> max_sym_count
)
4129 max_sym_count
= sym_count
;
4131 if ((sec
->flags
& SEC_RELOC
) != 0)
4135 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4136 if (ext_size
> max_external_reloc_size
)
4137 max_external_reloc_size
= ext_size
;
4138 if (sec
->reloc_count
> max_internal_reloc_count
)
4139 max_internal_reloc_count
= sec
->reloc_count
;
4145 if (o
->reloc_count
> 0)
4146 o
->flags
|= SEC_RELOC
;
4149 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4150 set it (this is probably a bug) and if it is set
4151 assign_section_numbers will create a reloc section. */
4152 o
->flags
&=~ SEC_RELOC
;
4155 /* If the SEC_ALLOC flag is not set, force the section VMA to
4156 zero. This is done in elf_fake_sections as well, but forcing
4157 the VMA to 0 here will ensure that relocs against these
4158 sections are handled correctly. */
4159 if ((o
->flags
& SEC_ALLOC
) == 0
4160 && ! o
->user_set_vma
)
4164 /* Figure out the file positions for everything but the symbol table
4165 and the relocs. We set symcount to force assign_section_numbers
4166 to create a symbol table. */
4167 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4168 BFD_ASSERT (! abfd
->output_has_begun
);
4169 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4172 /* Figure out how many relocations we will have in each section.
4173 Just using RELOC_COUNT isn't good enough since that doesn't
4174 maintain a separate value for REL vs. RELA relocations. */
4175 if (info
->relocateable
)
4176 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4177 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4179 asection
*output_section
;
4181 if (! o
->linker_mark
)
4183 /* This section was omitted from the link. */
4187 output_section
= o
->output_section
;
4189 if (output_section
!= NULL
4190 && (o
->flags
& SEC_RELOC
) != 0)
4192 struct bfd_elf_section_data
*esdi
4193 = elf_section_data (o
);
4194 struct bfd_elf_section_data
*esdo
4195 = elf_section_data (output_section
);
4196 unsigned int *rel_count
;
4197 unsigned int *rel_count2
;
4199 /* We must be careful to add the relocation froms the
4200 input section to the right output count. */
4201 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
4203 rel_count
= &esdo
->rel_count
;
4204 rel_count2
= &esdo
->rel_count2
;
4208 rel_count
= &esdo
->rel_count2
;
4209 rel_count2
= &esdo
->rel_count
;
4212 *rel_count
+= (esdi
->rel_hdr
.sh_size
4213 / esdi
->rel_hdr
.sh_entsize
);
4215 *rel_count2
+= (esdi
->rel_hdr2
->sh_size
4216 / esdi
->rel_hdr2
->sh_entsize
);
4220 /* That created the reloc sections. Set their sizes, and assign
4221 them file positions, and allocate some buffers. */
4222 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4224 if ((o
->flags
& SEC_RELOC
) != 0)
4226 if (!elf_link_size_reloc_section (abfd
,
4227 &elf_section_data (o
)->rel_hdr
,
4231 if (elf_section_data (o
)->rel_hdr2
4232 && !elf_link_size_reloc_section (abfd
,
4233 elf_section_data (o
)->rel_hdr2
,
4238 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4239 to count upwards while actually outputting the relocations. */
4240 elf_section_data (o
)->rel_count
= 0;
4241 elf_section_data (o
)->rel_count2
= 0;
4244 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4246 /* We have now assigned file positions for all the sections except
4247 .symtab and .strtab. We start the .symtab section at the current
4248 file position, and write directly to it. We build the .strtab
4249 section in memory. */
4250 bfd_get_symcount (abfd
) = 0;
4251 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4252 /* sh_name is set in prep_headers. */
4253 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4254 symtab_hdr
->sh_flags
= 0;
4255 symtab_hdr
->sh_addr
= 0;
4256 symtab_hdr
->sh_size
= 0;
4257 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4258 /* sh_link is set in assign_section_numbers. */
4259 /* sh_info is set below. */
4260 /* sh_offset is set just below. */
4261 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4263 off
= elf_tdata (abfd
)->next_file_pos
;
4264 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4266 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4267 incorrect. We do not yet know the size of the .symtab section.
4268 We correct next_file_pos below, after we do know the size. */
4270 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4271 continuously seeking to the right position in the file. */
4272 if (! info
->keep_memory
|| max_sym_count
< 20)
4273 finfo
.symbuf_size
= 20;
4275 finfo
.symbuf_size
= max_sym_count
;
4276 finfo
.symbuf
= ((Elf_External_Sym
*)
4277 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4278 if (finfo
.symbuf
== NULL
)
4281 /* Start writing out the symbol table. The first symbol is always a
4283 if (info
->strip
!= strip_all
|| info
->relocateable
)
4285 elfsym
.st_value
= 0;
4288 elfsym
.st_other
= 0;
4289 elfsym
.st_shndx
= SHN_UNDEF
;
4290 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4291 &elfsym
, bfd_und_section_ptr
))
4296 /* Some standard ELF linkers do this, but we don't because it causes
4297 bootstrap comparison failures. */
4298 /* Output a file symbol for the output file as the second symbol.
4299 We output this even if we are discarding local symbols, although
4300 I'm not sure if this is correct. */
4301 elfsym
.st_value
= 0;
4303 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4304 elfsym
.st_other
= 0;
4305 elfsym
.st_shndx
= SHN_ABS
;
4306 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4307 &elfsym
, bfd_abs_section_ptr
))
4311 /* Output a symbol for each section. We output these even if we are
4312 discarding local symbols, since they are used for relocs. These
4313 symbols have no names. We store the index of each one in the
4314 index field of the section, so that we can find it again when
4315 outputting relocs. */
4316 if (info
->strip
!= strip_all
|| info
->relocateable
)
4319 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4320 elfsym
.st_other
= 0;
4321 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4323 o
= section_from_elf_index (abfd
, i
);
4325 o
->target_index
= bfd_get_symcount (abfd
);
4326 elfsym
.st_shndx
= i
;
4327 if (info
->relocateable
|| o
== NULL
)
4328 elfsym
.st_value
= 0;
4330 elfsym
.st_value
= o
->vma
;
4331 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4337 /* Allocate some memory to hold information read in from the input
4339 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4340 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4341 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4342 bfd_malloc (max_internal_reloc_count
4343 * sizeof (Elf_Internal_Rela
)
4344 * bed
->s
->int_rels_per_ext_rel
));
4345 finfo
.external_syms
= ((Elf_External_Sym
*)
4346 bfd_malloc (max_sym_count
4347 * sizeof (Elf_External_Sym
)));
4348 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4349 bfd_malloc (max_sym_count
4350 * sizeof (Elf_Internal_Sym
)));
4351 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4352 finfo
.sections
= ((asection
**)
4353 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4354 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4355 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4356 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4357 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4358 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4359 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4360 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4363 /* Since ELF permits relocations to be against local symbols, we
4364 must have the local symbols available when we do the relocations.
4365 Since we would rather only read the local symbols once, and we
4366 would rather not keep them in memory, we handle all the
4367 relocations for a single input file at the same time.
4369 Unfortunately, there is no way to know the total number of local
4370 symbols until we have seen all of them, and the local symbol
4371 indices precede the global symbol indices. This means that when
4372 we are generating relocateable output, and we see a reloc against
4373 a global symbol, we can not know the symbol index until we have
4374 finished examining all the local symbols to see which ones we are
4375 going to output. To deal with this, we keep the relocations in
4376 memory, and don't output them until the end of the link. This is
4377 an unfortunate waste of memory, but I don't see a good way around
4378 it. Fortunately, it only happens when performing a relocateable
4379 link, which is not the common case. FIXME: If keep_memory is set
4380 we could write the relocs out and then read them again; I don't
4381 know how bad the memory loss will be. */
4383 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4384 sub
->output_has_begun
= false;
4385 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4387 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4389 if (p
->type
== bfd_indirect_link_order
4390 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4391 == bfd_target_elf_flavour
))
4393 sub
= p
->u
.indirect
.section
->owner
;
4394 if (! sub
->output_has_begun
)
4396 if (! elf_link_input_bfd (&finfo
, sub
))
4398 sub
->output_has_begun
= true;
4401 else if (p
->type
== bfd_section_reloc_link_order
4402 || p
->type
== bfd_symbol_reloc_link_order
)
4404 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4409 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4415 /* That wrote out all the local symbols. Finish up the symbol table
4416 with the global symbols. Even if we want to strip everything we
4417 can, we still need to deal with those global symbols that got
4418 converted to local in a version script. */
4422 /* Output any global symbols that got converted to local in a
4423 version script. We do this in a separate step since ELF
4424 requires all local symbols to appear prior to any global
4425 symbols. FIXME: We should only do this if some global
4426 symbols were, in fact, converted to become local. FIXME:
4427 Will this work correctly with the Irix 5 linker? */
4428 eoinfo
.failed
= false;
4429 eoinfo
.finfo
= &finfo
;
4430 eoinfo
.localsyms
= true;
4431 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4437 /* The sh_info field records the index of the first non local symbol. */
4438 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4442 Elf_Internal_Sym sym
;
4443 Elf_External_Sym
*dynsym
=
4444 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4445 long last_local
= 0;
4447 /* Write out the section symbols for the output sections. */
4454 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4457 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4460 indx
= elf_section_data (s
)->this_idx
;
4461 BFD_ASSERT (indx
> 0);
4462 sym
.st_shndx
= indx
;
4463 sym
.st_value
= s
->vma
;
4465 elf_swap_symbol_out (abfd
, &sym
,
4466 dynsym
+ elf_section_data (s
)->dynindx
);
4469 last_local
= bfd_count_sections (abfd
);
4472 /* Write out the local dynsyms. */
4473 if (elf_hash_table (info
)->dynlocal
)
4475 struct elf_link_local_dynamic_entry
*e
;
4476 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4480 sym
.st_size
= e
->isym
.st_size
;
4481 sym
.st_other
= e
->isym
.st_other
;
4483 /* Copy the internal symbol as is.
4484 Note that we saved a word of storage and overwrote
4485 the original st_name with the dynstr_index. */
4488 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4490 s
= bfd_section_from_elf_index (e
->input_bfd
,
4494 elf_section_data (s
->output_section
)->this_idx
;
4495 sym
.st_value
= (s
->output_section
->vma
4497 + e
->isym
.st_value
);
4500 if (last_local
< e
->dynindx
)
4501 last_local
= e
->dynindx
;
4503 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4507 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
4511 /* We get the global symbols from the hash table. */
4512 eoinfo
.failed
= false;
4513 eoinfo
.localsyms
= false;
4514 eoinfo
.finfo
= &finfo
;
4515 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4520 /* If backend needs to output some symbols not present in the hash
4521 table, do it now. */
4522 if (bed
->elf_backend_output_arch_syms
)
4524 if (! (*bed
->elf_backend_output_arch_syms
)
4525 (abfd
, info
, (PTR
) &finfo
,
4526 (boolean (*) PARAMS ((PTR
, const char *,
4527 Elf_Internal_Sym
*, asection
*)))
4528 elf_link_output_sym
))
4532 /* Flush all symbols to the file. */
4533 if (! elf_link_flush_output_syms (&finfo
))
4536 /* Now we know the size of the symtab section. */
4537 off
+= symtab_hdr
->sh_size
;
4539 /* Finish up and write out the symbol string table (.strtab)
4541 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4542 /* sh_name was set in prep_headers. */
4543 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4544 symstrtab_hdr
->sh_flags
= 0;
4545 symstrtab_hdr
->sh_addr
= 0;
4546 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4547 symstrtab_hdr
->sh_entsize
= 0;
4548 symstrtab_hdr
->sh_link
= 0;
4549 symstrtab_hdr
->sh_info
= 0;
4550 /* sh_offset is set just below. */
4551 symstrtab_hdr
->sh_addralign
= 1;
4553 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4554 elf_tdata (abfd
)->next_file_pos
= off
;
4556 if (bfd_get_symcount (abfd
) > 0)
4558 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4559 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4563 /* Adjust the relocs to have the correct symbol indices. */
4564 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4566 if ((o
->flags
& SEC_RELOC
) == 0)
4569 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4570 elf_section_data (o
)->rel_count
,
4571 elf_section_data (o
)->rel_hashes
);
4572 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4573 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4574 elf_section_data (o
)->rel_count2
,
4575 (elf_section_data (o
)->rel_hashes
4576 + elf_section_data (o
)->rel_count
));
4578 /* Set the reloc_count field to 0 to prevent write_relocs from
4579 trying to swap the relocs out itself. */
4583 /* If we are linking against a dynamic object, or generating a
4584 shared library, finish up the dynamic linking information. */
4587 Elf_External_Dyn
*dyncon
, *dynconend
;
4589 /* Fix up .dynamic entries. */
4590 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4591 BFD_ASSERT (o
!= NULL
);
4593 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4594 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4595 for (; dyncon
< dynconend
; dyncon
++)
4597 Elf_Internal_Dyn dyn
;
4601 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4608 name
= info
->init_function
;
4611 name
= info
->fini_function
;
4614 struct elf_link_hash_entry
*h
;
4616 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4617 false, false, true);
4619 && (h
->root
.type
== bfd_link_hash_defined
4620 || h
->root
.type
== bfd_link_hash_defweak
))
4622 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4623 o
= h
->root
.u
.def
.section
;
4624 if (o
->output_section
!= NULL
)
4625 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4626 + o
->output_offset
);
4629 /* The symbol is imported from another shared
4630 library and does not apply to this one. */
4634 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4649 name
= ".gnu.version_d";
4652 name
= ".gnu.version_r";
4655 name
= ".gnu.version";
4657 o
= bfd_get_section_by_name (abfd
, name
);
4658 BFD_ASSERT (o
!= NULL
);
4659 dyn
.d_un
.d_ptr
= o
->vma
;
4660 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4667 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4672 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4674 Elf_Internal_Shdr
*hdr
;
4676 hdr
= elf_elfsections (abfd
)[i
];
4677 if (hdr
->sh_type
== type
4678 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4680 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4681 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4684 if (dyn
.d_un
.d_val
== 0
4685 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4686 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4690 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4696 /* If we have created any dynamic sections, then output them. */
4699 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4702 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4704 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4705 || o
->_raw_size
== 0)
4707 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4709 /* At this point, we are only interested in sections
4710 created by elf_link_create_dynamic_sections. */
4713 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4715 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4717 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4718 o
->contents
, o
->output_offset
,
4726 /* The contents of the .dynstr section are actually in a
4728 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4729 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4730 || ! _bfd_stringtab_emit (abfd
,
4731 elf_hash_table (info
)->dynstr
))
4737 /* If we have optimized stabs strings, output them. */
4738 if (elf_hash_table (info
)->stab_info
!= NULL
)
4740 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4744 if (finfo
.symstrtab
!= NULL
)
4745 _bfd_stringtab_free (finfo
.symstrtab
);
4746 if (finfo
.contents
!= NULL
)
4747 free (finfo
.contents
);
4748 if (finfo
.external_relocs
!= NULL
)
4749 free (finfo
.external_relocs
);
4750 if (finfo
.internal_relocs
!= NULL
)
4751 free (finfo
.internal_relocs
);
4752 if (finfo
.external_syms
!= NULL
)
4753 free (finfo
.external_syms
);
4754 if (finfo
.internal_syms
!= NULL
)
4755 free (finfo
.internal_syms
);
4756 if (finfo
.indices
!= NULL
)
4757 free (finfo
.indices
);
4758 if (finfo
.sections
!= NULL
)
4759 free (finfo
.sections
);
4760 if (finfo
.symbuf
!= NULL
)
4761 free (finfo
.symbuf
);
4762 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4764 if ((o
->flags
& SEC_RELOC
) != 0
4765 && elf_section_data (o
)->rel_hashes
!= NULL
)
4766 free (elf_section_data (o
)->rel_hashes
);
4769 elf_tdata (abfd
)->linker
= true;
4774 if (finfo
.symstrtab
!= NULL
)
4775 _bfd_stringtab_free (finfo
.symstrtab
);
4776 if (finfo
.contents
!= NULL
)
4777 free (finfo
.contents
);
4778 if (finfo
.external_relocs
!= NULL
)
4779 free (finfo
.external_relocs
);
4780 if (finfo
.internal_relocs
!= NULL
)
4781 free (finfo
.internal_relocs
);
4782 if (finfo
.external_syms
!= NULL
)
4783 free (finfo
.external_syms
);
4784 if (finfo
.internal_syms
!= NULL
)
4785 free (finfo
.internal_syms
);
4786 if (finfo
.indices
!= NULL
)
4787 free (finfo
.indices
);
4788 if (finfo
.sections
!= NULL
)
4789 free (finfo
.sections
);
4790 if (finfo
.symbuf
!= NULL
)
4791 free (finfo
.symbuf
);
4792 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4794 if ((o
->flags
& SEC_RELOC
) != 0
4795 && elf_section_data (o
)->rel_hashes
!= NULL
)
4796 free (elf_section_data (o
)->rel_hashes
);
4802 /* Add a symbol to the output symbol table. */
4805 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4806 struct elf_final_link_info
*finfo
;
4808 Elf_Internal_Sym
*elfsym
;
4809 asection
*input_sec
;
4811 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4812 struct bfd_link_info
*info
,
4817 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4818 elf_backend_link_output_symbol_hook
;
4819 if (output_symbol_hook
!= NULL
)
4821 if (! ((*output_symbol_hook
)
4822 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4826 if (name
== (const char *) NULL
|| *name
== '\0')
4827 elfsym
->st_name
= 0;
4828 else if (input_sec
->flags
& SEC_EXCLUDE
)
4829 elfsym
->st_name
= 0;
4832 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4835 if (elfsym
->st_name
== (unsigned long) -1)
4839 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4841 if (! elf_link_flush_output_syms (finfo
))
4845 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4846 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4847 ++finfo
->symbuf_count
;
4849 ++ bfd_get_symcount (finfo
->output_bfd
);
4854 /* Flush the output symbols to the file. */
4857 elf_link_flush_output_syms (finfo
)
4858 struct elf_final_link_info
*finfo
;
4860 if (finfo
->symbuf_count
> 0)
4862 Elf_Internal_Shdr
*symtab
;
4864 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4866 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4868 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4869 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4870 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4873 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4875 finfo
->symbuf_count
= 0;
4881 /* Add an external symbol to the symbol table. This is called from
4882 the hash table traversal routine. When generating a shared object,
4883 we go through the symbol table twice. The first time we output
4884 anything that might have been forced to local scope in a version
4885 script. The second time we output the symbols that are still
4889 elf_link_output_extsym (h
, data
)
4890 struct elf_link_hash_entry
*h
;
4893 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4894 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4896 Elf_Internal_Sym sym
;
4897 asection
*input_sec
;
4899 /* Decide whether to output this symbol in this pass. */
4900 if (eoinfo
->localsyms
)
4902 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4907 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4911 /* If we are not creating a shared library, and this symbol is
4912 referenced by a shared library but is not defined anywhere, then
4913 warn that it is undefined. If we do not do this, the runtime
4914 linker will complain that the symbol is undefined when the
4915 program is run. We don't have to worry about symbols that are
4916 referenced by regular files, because we will already have issued
4917 warnings for them. */
4918 if (! finfo
->info
->relocateable
4919 && ! (finfo
->info
->shared
4920 && !finfo
->info
->no_undefined
)
4921 && h
->root
.type
== bfd_link_hash_undefined
4922 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4923 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4925 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4926 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4927 (asection
*) NULL
, 0, true)))
4929 eoinfo
->failed
= true;
4934 /* We don't want to output symbols that have never been mentioned by
4935 a regular file, or that we have been told to strip. However, if
4936 h->indx is set to -2, the symbol is used by a reloc and we must
4940 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4941 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4942 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4943 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4945 else if (finfo
->info
->strip
== strip_all
4946 || (finfo
->info
->strip
== strip_some
4947 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4948 h
->root
.root
.string
,
4949 false, false) == NULL
))
4954 /* If we're stripping it, and it's not a dynamic symbol, there's
4955 nothing else to do unless it is a forced local symbol. */
4958 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4962 sym
.st_size
= h
->size
;
4963 sym
.st_other
= h
->other
;
4964 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4965 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4966 else if (h
->root
.type
== bfd_link_hash_undefweak
4967 || h
->root
.type
== bfd_link_hash_defweak
)
4968 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4970 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4972 switch (h
->root
.type
)
4975 case bfd_link_hash_new
:
4979 case bfd_link_hash_undefined
:
4980 input_sec
= bfd_und_section_ptr
;
4981 sym
.st_shndx
= SHN_UNDEF
;
4984 case bfd_link_hash_undefweak
:
4985 input_sec
= bfd_und_section_ptr
;
4986 sym
.st_shndx
= SHN_UNDEF
;
4989 case bfd_link_hash_defined
:
4990 case bfd_link_hash_defweak
:
4992 input_sec
= h
->root
.u
.def
.section
;
4993 if (input_sec
->output_section
!= NULL
)
4996 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4997 input_sec
->output_section
);
4998 if (sym
.st_shndx
== (unsigned short) -1)
5000 (*_bfd_error_handler
)
5001 (_("%s: could not find output section %s for input section %s"),
5002 bfd_get_filename (finfo
->output_bfd
),
5003 input_sec
->output_section
->name
,
5005 eoinfo
->failed
= true;
5009 /* ELF symbols in relocateable files are section relative,
5010 but in nonrelocateable files they are virtual
5012 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
5013 if (! finfo
->info
->relocateable
)
5014 sym
.st_value
+= input_sec
->output_section
->vma
;
5018 BFD_ASSERT (input_sec
->owner
== NULL
5019 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
5020 sym
.st_shndx
= SHN_UNDEF
;
5021 input_sec
= bfd_und_section_ptr
;
5026 case bfd_link_hash_common
:
5027 input_sec
= h
->root
.u
.c
.p
->section
;
5028 sym
.st_shndx
= SHN_COMMON
;
5029 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
5032 case bfd_link_hash_indirect
:
5033 /* These symbols are created by symbol versioning. They point
5034 to the decorated version of the name. For example, if the
5035 symbol foo@@GNU_1.2 is the default, which should be used when
5036 foo is used with no version, then we add an indirect symbol
5037 foo which points to foo@@GNU_1.2. We ignore these symbols,
5038 since the indirected symbol is already in the hash table. If
5039 the indirect symbol is non-ELF, fall through and output it. */
5040 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
5044 case bfd_link_hash_warning
:
5045 /* We can't represent these symbols in ELF, although a warning
5046 symbol may have come from a .gnu.warning.SYMBOL section. We
5047 just put the target symbol in the hash table. If the target
5048 symbol does not really exist, don't do anything. */
5049 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
5051 return (elf_link_output_extsym
5052 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
5055 /* Give the processor backend a chance to tweak the symbol value,
5056 and also to finish up anything that needs to be done for this
5058 if ((h
->dynindx
!= -1
5059 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5060 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5062 struct elf_backend_data
*bed
;
5064 bed
= get_elf_backend_data (finfo
->output_bfd
);
5065 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
5066 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
5068 eoinfo
->failed
= true;
5073 /* If we are marking the symbol as undefined, and there are no
5074 non-weak references to this symbol from a regular object, then
5075 mark the symbol as weak undefined; if there are non-weak
5076 references, mark the symbol as strong. We can't do this earlier,
5077 because it might not be marked as undefined until the
5078 finish_dynamic_symbol routine gets through with it. */
5079 if (sym
.st_shndx
== SHN_UNDEF
5080 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
5081 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
5082 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
5086 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
5087 bindtype
= STB_GLOBAL
;
5089 bindtype
= STB_WEAK
;
5090 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
5093 /* If this symbol should be put in the .dynsym section, then put it
5094 there now. We have already know the symbol index. We also fill
5095 in the entry in the .hash section. */
5096 if (h
->dynindx
!= -1
5097 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5101 size_t hash_entry_size
;
5102 bfd_byte
*bucketpos
;
5105 sym
.st_name
= h
->dynstr_index
;
5107 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
5108 (PTR
) (((Elf_External_Sym
*)
5109 finfo
->dynsym_sec
->contents
)
5112 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
5113 bucket
= h
->elf_hash_value
% bucketcount
;
5115 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
5116 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
5117 + (bucket
+ 2) * hash_entry_size
);
5118 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
5119 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
5120 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
5121 ((bfd_byte
*) finfo
->hash_sec
->contents
5122 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
5124 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
5126 Elf_Internal_Versym iversym
;
5128 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5130 if (h
->verinfo
.verdef
== NULL
)
5131 iversym
.vs_vers
= 0;
5133 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
5137 if (h
->verinfo
.vertree
== NULL
)
5138 iversym
.vs_vers
= 1;
5140 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
5143 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
5144 iversym
.vs_vers
|= VERSYM_HIDDEN
;
5146 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
5147 (((Elf_External_Versym
*)
5148 finfo
->symver_sec
->contents
)
5153 /* If we're stripping it, then it was just a dynamic symbol, and
5154 there's nothing else to do. */
5158 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
5160 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
5162 eoinfo
->failed
= true;
5169 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5170 originated from the section given by INPUT_REL_HDR) to the
5174 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
5177 asection
*input_section
;
5178 Elf_Internal_Shdr
*input_rel_hdr
;
5179 Elf_Internal_Rela
*internal_relocs
;
5181 Elf_Internal_Rela
*irela
;
5182 Elf_Internal_Rela
*irelaend
;
5183 Elf_Internal_Shdr
*output_rel_hdr
;
5184 asection
*output_section
;
5185 unsigned int *rel_countp
= NULL
;
5187 output_section
= input_section
->output_section
;
5188 output_rel_hdr
= NULL
;
5190 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
5191 == input_rel_hdr
->sh_entsize
)
5193 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5194 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5196 else if (elf_section_data (output_section
)->rel_hdr2
5197 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5198 == input_rel_hdr
->sh_entsize
))
5200 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5201 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5204 BFD_ASSERT (output_rel_hdr
!= NULL
);
5206 irela
= internal_relocs
;
5207 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5208 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5210 Elf_External_Rel
*erel
;
5212 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5213 for (; irela
< irelaend
; irela
++, erel
++)
5215 Elf_Internal_Rel irel
;
5217 irel
.r_offset
= irela
->r_offset
;
5218 irel
.r_info
= irela
->r_info
;
5219 BFD_ASSERT (irela
->r_addend
== 0);
5220 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5225 Elf_External_Rela
*erela
;
5227 BFD_ASSERT (input_rel_hdr
->sh_entsize
5228 == sizeof (Elf_External_Rela
));
5229 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5230 for (; irela
< irelaend
; irela
++, erela
++)
5231 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5234 /* Bump the counter, so that we know where to add the next set of
5236 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5239 /* Link an input file into the linker output file. This function
5240 handles all the sections and relocations of the input file at once.
5241 This is so that we only have to read the local symbols once, and
5242 don't have to keep them in memory. */
5245 elf_link_input_bfd (finfo
, input_bfd
)
5246 struct elf_final_link_info
*finfo
;
5249 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5250 bfd
*, asection
*, bfd_byte
*,
5251 Elf_Internal_Rela
*,
5252 Elf_Internal_Sym
*, asection
**));
5254 Elf_Internal_Shdr
*symtab_hdr
;
5257 Elf_External_Sym
*external_syms
;
5258 Elf_External_Sym
*esym
;
5259 Elf_External_Sym
*esymend
;
5260 Elf_Internal_Sym
*isym
;
5262 asection
**ppsection
;
5264 struct elf_backend_data
*bed
;
5266 output_bfd
= finfo
->output_bfd
;
5267 bed
= get_elf_backend_data (output_bfd
);
5268 relocate_section
= bed
->elf_backend_relocate_section
;
5270 /* If this is a dynamic object, we don't want to do anything here:
5271 we don't want the local symbols, and we don't want the section
5273 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5276 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5277 if (elf_bad_symtab (input_bfd
))
5279 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5284 locsymcount
= symtab_hdr
->sh_info
;
5285 extsymoff
= symtab_hdr
->sh_info
;
5288 /* Read the local symbols. */
5289 if (symtab_hdr
->contents
!= NULL
)
5290 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5291 else if (locsymcount
== 0)
5292 external_syms
= NULL
;
5295 external_syms
= finfo
->external_syms
;
5296 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5297 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5298 locsymcount
, input_bfd
)
5299 != locsymcount
* sizeof (Elf_External_Sym
)))
5303 /* Swap in the local symbols and write out the ones which we know
5304 are going into the output file. */
5305 esym
= external_syms
;
5306 esymend
= esym
+ locsymcount
;
5307 isym
= finfo
->internal_syms
;
5308 pindex
= finfo
->indices
;
5309 ppsection
= finfo
->sections
;
5310 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5314 Elf_Internal_Sym osym
;
5316 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5319 if (elf_bad_symtab (input_bfd
))
5321 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5328 if (isym
->st_shndx
== SHN_UNDEF
)
5329 isec
= bfd_und_section_ptr
;
5330 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5331 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5332 else if (isym
->st_shndx
== SHN_ABS
)
5333 isec
= bfd_abs_section_ptr
;
5334 else if (isym
->st_shndx
== SHN_COMMON
)
5335 isec
= bfd_com_section_ptr
;
5344 /* Don't output the first, undefined, symbol. */
5345 if (esym
== external_syms
)
5348 /* If we are stripping all symbols, we don't want to output this
5350 if (finfo
->info
->strip
== strip_all
)
5353 /* We never output section symbols. Instead, we use the section
5354 symbol of the corresponding section in the output file. */
5355 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5358 /* If we are discarding all local symbols, we don't want to
5359 output this one. If we are generating a relocateable output
5360 file, then some of the local symbols may be required by
5361 relocs; we output them below as we discover that they are
5363 if (finfo
->info
->discard
== discard_all
)
5366 /* If this symbol is defined in a section which we are
5367 discarding, we don't need to keep it, but note that
5368 linker_mark is only reliable for sections that have contents.
5369 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5370 as well as linker_mark. */
5371 if (isym
->st_shndx
> 0
5372 && isym
->st_shndx
< SHN_LORESERVE
5374 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5375 || (! finfo
->info
->relocateable
5376 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5379 /* Get the name of the symbol. */
5380 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5385 /* See if we are discarding symbols with this name. */
5386 if ((finfo
->info
->strip
== strip_some
5387 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5389 || (finfo
->info
->discard
== discard_l
5390 && bfd_is_local_label_name (input_bfd
, name
)))
5393 /* If we get here, we are going to output this symbol. */
5397 /* Adjust the section index for the output file. */
5398 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5399 isec
->output_section
);
5400 if (osym
.st_shndx
== (unsigned short) -1)
5403 *pindex
= bfd_get_symcount (output_bfd
);
5405 /* ELF symbols in relocateable files are section relative, but
5406 in executable files they are virtual addresses. Note that
5407 this code assumes that all ELF sections have an associated
5408 BFD section with a reasonable value for output_offset; below
5409 we assume that they also have a reasonable value for
5410 output_section. Any special sections must be set up to meet
5411 these requirements. */
5412 osym
.st_value
+= isec
->output_offset
;
5413 if (! finfo
->info
->relocateable
)
5414 osym
.st_value
+= isec
->output_section
->vma
;
5416 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5420 /* Relocate the contents of each section. */
5421 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5425 if (! o
->linker_mark
)
5427 /* This section was omitted from the link. */
5431 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5432 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5435 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5437 /* Section was created by elf_link_create_dynamic_sections
5442 /* Get the contents of the section. They have been cached by a
5443 relaxation routine. Note that o is a section in an input
5444 file, so the contents field will not have been set by any of
5445 the routines which work on output files. */
5446 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5447 contents
= elf_section_data (o
)->this_hdr
.contents
;
5450 contents
= finfo
->contents
;
5451 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5452 (file_ptr
) 0, o
->_raw_size
))
5456 if ((o
->flags
& SEC_RELOC
) != 0)
5458 Elf_Internal_Rela
*internal_relocs
;
5460 /* Get the swapped relocs. */
5461 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5462 (input_bfd
, o
, finfo
->external_relocs
,
5463 finfo
->internal_relocs
, false));
5464 if (internal_relocs
== NULL
5465 && o
->reloc_count
> 0)
5468 /* Relocate the section by invoking a back end routine.
5470 The back end routine is responsible for adjusting the
5471 section contents as necessary, and (if using Rela relocs
5472 and generating a relocateable output file) adjusting the
5473 reloc addend as necessary.
5475 The back end routine does not have to worry about setting
5476 the reloc address or the reloc symbol index.
5478 The back end routine is given a pointer to the swapped in
5479 internal symbols, and can access the hash table entries
5480 for the external symbols via elf_sym_hashes (input_bfd).
5482 When generating relocateable output, the back end routine
5483 must handle STB_LOCAL/STT_SECTION symbols specially. The
5484 output symbol is going to be a section symbol
5485 corresponding to the output section, which will require
5486 the addend to be adjusted. */
5488 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5489 input_bfd
, o
, contents
,
5491 finfo
->internal_syms
,
5495 if (finfo
->info
->relocateable
)
5497 Elf_Internal_Rela
*irela
;
5498 Elf_Internal_Rela
*irelaend
;
5499 struct elf_link_hash_entry
**rel_hash
;
5500 Elf_Internal_Shdr
*input_rel_hdr
;
5502 /* Adjust the reloc addresses and symbol indices. */
5504 irela
= internal_relocs
;
5506 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5507 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5508 + elf_section_data (o
->output_section
)->rel_count
5509 + elf_section_data (o
->output_section
)->rel_count2
);
5510 for (; irela
< irelaend
; irela
++, rel_hash
++)
5512 unsigned long r_symndx
;
5513 Elf_Internal_Sym
*isym
;
5516 irela
->r_offset
+= o
->output_offset
;
5518 r_symndx
= ELF_R_SYM (irela
->r_info
);
5523 if (r_symndx
>= locsymcount
5524 || (elf_bad_symtab (input_bfd
)
5525 && finfo
->sections
[r_symndx
] == NULL
))
5527 struct elf_link_hash_entry
*rh
;
5530 /* This is a reloc against a global symbol. We
5531 have not yet output all the local symbols, so
5532 we do not know the symbol index of any global
5533 symbol. We set the rel_hash entry for this
5534 reloc to point to the global hash table entry
5535 for this symbol. The symbol index is then
5536 set at the end of elf_bfd_final_link. */
5537 indx
= r_symndx
- extsymoff
;
5538 rh
= elf_sym_hashes (input_bfd
)[indx
];
5539 while (rh
->root
.type
== bfd_link_hash_indirect
5540 || rh
->root
.type
== bfd_link_hash_warning
)
5541 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5543 /* Setting the index to -2 tells
5544 elf_link_output_extsym that this symbol is
5546 BFD_ASSERT (rh
->indx
< 0);
5554 /* This is a reloc against a local symbol. */
5557 isym
= finfo
->internal_syms
+ r_symndx
;
5558 sec
= finfo
->sections
[r_symndx
];
5559 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5561 /* I suppose the backend ought to fill in the
5562 section of any STT_SECTION symbol against a
5563 processor specific section. If we have
5564 discarded a section, the output_section will
5565 be the absolute section. */
5567 && (bfd_is_abs_section (sec
)
5568 || (sec
->output_section
!= NULL
5569 && bfd_is_abs_section (sec
->output_section
))))
5571 else if (sec
== NULL
|| sec
->owner
== NULL
)
5573 bfd_set_error (bfd_error_bad_value
);
5578 r_symndx
= sec
->output_section
->target_index
;
5579 BFD_ASSERT (r_symndx
!= 0);
5584 if (finfo
->indices
[r_symndx
] == -1)
5590 if (finfo
->info
->strip
== strip_all
)
5592 /* You can't do ld -r -s. */
5593 bfd_set_error (bfd_error_invalid_operation
);
5597 /* This symbol was skipped earlier, but
5598 since it is needed by a reloc, we
5599 must output it now. */
5600 link
= symtab_hdr
->sh_link
;
5601 name
= bfd_elf_string_from_elf_section (input_bfd
,
5607 osec
= sec
->output_section
;
5609 _bfd_elf_section_from_bfd_section (output_bfd
,
5611 if (isym
->st_shndx
== (unsigned short) -1)
5614 isym
->st_value
+= sec
->output_offset
;
5615 if (! finfo
->info
->relocateable
)
5616 isym
->st_value
+= osec
->vma
;
5618 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5620 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5624 r_symndx
= finfo
->indices
[r_symndx
];
5627 irela
->r_info
= ELF_R_INFO (r_symndx
,
5628 ELF_R_TYPE (irela
->r_info
));
5631 /* Swap out the relocs. */
5632 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5633 elf_link_output_relocs (output_bfd
, o
,
5637 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5638 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5640 elf_link_output_relocs (output_bfd
, o
,
5646 /* Write out the modified section contents. */
5647 if (elf_section_data (o
)->stab_info
== NULL
)
5649 if (! (o
->flags
& SEC_EXCLUDE
) &&
5650 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5651 contents
, o
->output_offset
,
5652 (o
->_cooked_size
!= 0
5659 if (! (_bfd_write_section_stabs
5660 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5661 o
, &elf_section_data (o
)->stab_info
, contents
)))
5669 /* Generate a reloc when linking an ELF file. This is a reloc
5670 requested by the linker, and does come from any input file. This
5671 is used to build constructor and destructor tables when linking
5675 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5677 struct bfd_link_info
*info
;
5678 asection
*output_section
;
5679 struct bfd_link_order
*link_order
;
5681 reloc_howto_type
*howto
;
5685 struct elf_link_hash_entry
**rel_hash_ptr
;
5686 Elf_Internal_Shdr
*rel_hdr
;
5688 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5691 bfd_set_error (bfd_error_bad_value
);
5695 addend
= link_order
->u
.reloc
.p
->addend
;
5697 /* Figure out the symbol index. */
5698 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5699 + elf_section_data (output_section
)->rel_count
5700 + elf_section_data (output_section
)->rel_count2
);
5701 if (link_order
->type
== bfd_section_reloc_link_order
)
5703 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5704 BFD_ASSERT (indx
!= 0);
5705 *rel_hash_ptr
= NULL
;
5709 struct elf_link_hash_entry
*h
;
5711 /* Treat a reloc against a defined symbol as though it were
5712 actually against the section. */
5713 h
= ((struct elf_link_hash_entry
*)
5714 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5715 link_order
->u
.reloc
.p
->u
.name
,
5716 false, false, true));
5718 && (h
->root
.type
== bfd_link_hash_defined
5719 || h
->root
.type
== bfd_link_hash_defweak
))
5723 section
= h
->root
.u
.def
.section
;
5724 indx
= section
->output_section
->target_index
;
5725 *rel_hash_ptr
= NULL
;
5726 /* It seems that we ought to add the symbol value to the
5727 addend here, but in practice it has already been added
5728 because it was passed to constructor_callback. */
5729 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5733 /* Setting the index to -2 tells elf_link_output_extsym that
5734 this symbol is used by a reloc. */
5741 if (! ((*info
->callbacks
->unattached_reloc
)
5742 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5743 (asection
*) NULL
, (bfd_vma
) 0)))
5749 /* If this is an inplace reloc, we must write the addend into the
5751 if (howto
->partial_inplace
&& addend
!= 0)
5754 bfd_reloc_status_type rstat
;
5758 size
= bfd_get_reloc_size (howto
);
5759 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5760 if (buf
== (bfd_byte
*) NULL
)
5762 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5768 case bfd_reloc_outofrange
:
5770 case bfd_reloc_overflow
:
5771 if (! ((*info
->callbacks
->reloc_overflow
)
5773 (link_order
->type
== bfd_section_reloc_link_order
5774 ? bfd_section_name (output_bfd
,
5775 link_order
->u
.reloc
.p
->u
.section
)
5776 : link_order
->u
.reloc
.p
->u
.name
),
5777 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5785 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5786 (file_ptr
) link_order
->offset
, size
);
5792 /* The address of a reloc is relative to the section in a
5793 relocateable file, and is a virtual address in an executable
5795 offset
= link_order
->offset
;
5796 if (! info
->relocateable
)
5797 offset
+= output_section
->vma
;
5799 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5801 if (rel_hdr
->sh_type
== SHT_REL
)
5803 Elf_Internal_Rel irel
;
5804 Elf_External_Rel
*erel
;
5806 irel
.r_offset
= offset
;
5807 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5808 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5809 + elf_section_data (output_section
)->rel_count
);
5810 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5814 Elf_Internal_Rela irela
;
5815 Elf_External_Rela
*erela
;
5817 irela
.r_offset
= offset
;
5818 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5819 irela
.r_addend
= addend
;
5820 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5821 + elf_section_data (output_section
)->rel_count
);
5822 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5825 ++elf_section_data (output_section
)->rel_count
;
5831 /* Allocate a pointer to live in a linker created section. */
5834 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5836 struct bfd_link_info
*info
;
5837 elf_linker_section_t
*lsect
;
5838 struct elf_link_hash_entry
*h
;
5839 const Elf_Internal_Rela
*rel
;
5841 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5842 elf_linker_section_pointers_t
*linker_section_ptr
;
5843 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5845 BFD_ASSERT (lsect
!= NULL
);
5847 /* Is this a global symbol? */
5850 /* Has this symbol already been allocated, if so, our work is done */
5851 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5856 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5857 /* Make sure this symbol is output as a dynamic symbol. */
5858 if (h
->dynindx
== -1)
5860 if (! elf_link_record_dynamic_symbol (info
, h
))
5864 if (lsect
->rel_section
)
5865 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5868 else /* Allocation of a pointer to a local symbol */
5870 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5872 /* Allocate a table to hold the local symbols if first time */
5875 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5876 register unsigned int i
;
5878 ptr
= (elf_linker_section_pointers_t
**)
5879 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5884 elf_local_ptr_offsets (abfd
) = ptr
;
5885 for (i
= 0; i
< num_symbols
; i
++)
5886 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5889 /* Has this symbol already been allocated, if so, our work is done */
5890 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5895 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5899 /* If we are generating a shared object, we need to
5900 output a R_<xxx>_RELATIVE reloc so that the
5901 dynamic linker can adjust this GOT entry. */
5902 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5903 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5907 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5908 from internal memory. */
5909 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5910 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5911 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5913 if (!linker_section_ptr
)
5916 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5917 linker_section_ptr
->addend
= rel
->r_addend
;
5918 linker_section_ptr
->which
= lsect
->which
;
5919 linker_section_ptr
->written_address_p
= false;
5920 *ptr_linker_section_ptr
= linker_section_ptr
;
5923 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5925 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5926 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5927 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5928 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5930 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5932 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5933 lsect
->sym_hash
->root
.root
.string
,
5934 (long)ARCH_SIZE
/ 8,
5935 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5941 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5943 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5946 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5947 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5955 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5958 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5961 /* Fill in the address for a pointer generated in alinker section. */
5964 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5967 struct bfd_link_info
*info
;
5968 elf_linker_section_t
*lsect
;
5969 struct elf_link_hash_entry
*h
;
5971 const Elf_Internal_Rela
*rel
;
5974 elf_linker_section_pointers_t
*linker_section_ptr
;
5976 BFD_ASSERT (lsect
!= NULL
);
5978 if (h
!= NULL
) /* global symbol */
5980 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5984 BFD_ASSERT (linker_section_ptr
!= NULL
);
5986 if (! elf_hash_table (info
)->dynamic_sections_created
5989 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5991 /* This is actually a static link, or it is a
5992 -Bsymbolic link and the symbol is defined
5993 locally. We must initialize this entry in the
5996 When doing a dynamic link, we create a .rela.<xxx>
5997 relocation entry to initialize the value. This
5998 is done in the finish_dynamic_symbol routine. */
5999 if (!linker_section_ptr
->written_address_p
)
6001 linker_section_ptr
->written_address_p
= true;
6002 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6003 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6007 else /* local symbol */
6009 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6010 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
6011 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
6012 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
6016 BFD_ASSERT (linker_section_ptr
!= NULL
);
6018 /* Write out pointer if it hasn't been rewritten out before */
6019 if (!linker_section_ptr
->written_address_p
)
6021 linker_section_ptr
->written_address_p
= true;
6022 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6023 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6027 asection
*srel
= lsect
->rel_section
;
6028 Elf_Internal_Rela outrel
;
6030 /* We need to generate a relative reloc for the dynamic linker. */
6032 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
6035 BFD_ASSERT (srel
!= NULL
);
6037 outrel
.r_offset
= (lsect
->section
->output_section
->vma
6038 + lsect
->section
->output_offset
6039 + linker_section_ptr
->offset
);
6040 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
6041 outrel
.r_addend
= 0;
6042 elf_swap_reloca_out (output_bfd
, &outrel
,
6043 (((Elf_External_Rela
*)
6044 lsect
->section
->contents
)
6045 + elf_section_data (lsect
->section
)->rel_count
));
6046 ++elf_section_data (lsect
->section
)->rel_count
;
6051 relocation
= (lsect
->section
->output_offset
6052 + linker_section_ptr
->offset
6053 - lsect
->hole_offset
6054 - lsect
->sym_offset
);
6057 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6058 lsect
->name
, (long)relocation
, (long)relocation
);
6061 /* Subtract out the addend, because it will get added back in by the normal
6063 return relocation
- linker_section_ptr
->addend
;
6066 /* Garbage collect unused sections. */
6068 static boolean elf_gc_mark
6069 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
6070 asection
* (*gc_mark_hook
)
6071 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6072 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
6074 static boolean elf_gc_sweep
6075 PARAMS ((struct bfd_link_info
*info
,
6076 boolean (*gc_sweep_hook
)
6077 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6078 const Elf_Internal_Rela
*relocs
))));
6080 static boolean elf_gc_sweep_symbol
6081 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
6083 static boolean elf_gc_allocate_got_offsets
6084 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
6086 static boolean elf_gc_propagate_vtable_entries_used
6087 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6089 static boolean elf_gc_smash_unused_vtentry_relocs
6090 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6092 /* The mark phase of garbage collection. For a given section, mark
6093 it, and all the sections which define symbols to which it refers. */
6096 elf_gc_mark (info
, sec
, gc_mark_hook
)
6097 struct bfd_link_info
*info
;
6099 asection
* (*gc_mark_hook
)
6100 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6101 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
6107 /* Look through the section relocs. */
6109 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
6111 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
6112 Elf_Internal_Shdr
*symtab_hdr
;
6113 struct elf_link_hash_entry
**sym_hashes
;
6116 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
6117 bfd
*input_bfd
= sec
->owner
;
6118 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
6120 /* GCFIXME: how to arrange so that relocs and symbols are not
6121 reread continually? */
6123 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6124 sym_hashes
= elf_sym_hashes (input_bfd
);
6126 /* Read the local symbols. */
6127 if (elf_bad_symtab (input_bfd
))
6129 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6133 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
6134 if (symtab_hdr
->contents
)
6135 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6136 else if (nlocsyms
== 0)
6140 locsyms
= freesyms
=
6141 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
6142 if (freesyms
== NULL
6143 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6144 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
6145 nlocsyms
, input_bfd
)
6146 != nlocsyms
* sizeof (Elf_External_Sym
)))
6153 /* Read the relocations. */
6154 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6155 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
6156 info
->keep_memory
));
6157 if (relstart
== NULL
)
6162 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6164 for (rel
= relstart
; rel
< relend
; rel
++)
6166 unsigned long r_symndx
;
6168 struct elf_link_hash_entry
*h
;
6171 r_symndx
= ELF_R_SYM (rel
->r_info
);
6175 if (elf_bad_symtab (sec
->owner
))
6177 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6178 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
6179 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6182 h
= sym_hashes
[r_symndx
- extsymoff
];
6183 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6186 else if (r_symndx
>= nlocsyms
)
6188 h
= sym_hashes
[r_symndx
- extsymoff
];
6189 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6193 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6194 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6197 if (rsec
&& !rsec
->gc_mark
)
6198 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6206 if (!info
->keep_memory
)
6216 /* The sweep phase of garbage collection. Remove all garbage sections. */
6219 elf_gc_sweep (info
, gc_sweep_hook
)
6220 struct bfd_link_info
*info
;
6221 boolean (*gc_sweep_hook
)
6222 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6223 const Elf_Internal_Rela
*relocs
));
6227 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6231 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6234 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6236 /* Keep special sections. Keep .debug sections. */
6237 if ((o
->flags
& SEC_LINKER_CREATED
)
6238 || (o
->flags
& SEC_DEBUGGING
))
6244 /* Skip sweeping sections already excluded. */
6245 if (o
->flags
& SEC_EXCLUDE
)
6248 /* Since this is early in the link process, it is simple
6249 to remove a section from the output. */
6250 o
->flags
|= SEC_EXCLUDE
;
6252 /* But we also have to update some of the relocation
6253 info we collected before. */
6255 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6257 Elf_Internal_Rela
*internal_relocs
;
6260 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6261 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6262 if (internal_relocs
== NULL
)
6265 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6267 if (!info
->keep_memory
)
6268 free (internal_relocs
);
6276 /* Remove the symbols that were in the swept sections from the dynamic
6277 symbol table. GCFIXME: Anyone know how to get them out of the
6278 static symbol table as well? */
6282 elf_link_hash_traverse (elf_hash_table (info
),
6283 elf_gc_sweep_symbol
,
6286 elf_hash_table (info
)->dynsymcount
= i
;
6292 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6295 elf_gc_sweep_symbol (h
, idxptr
)
6296 struct elf_link_hash_entry
*h
;
6299 int *idx
= (int *) idxptr
;
6301 if (h
->dynindx
!= -1
6302 && ((h
->root
.type
!= bfd_link_hash_defined
6303 && h
->root
.type
!= bfd_link_hash_defweak
)
6304 || h
->root
.u
.def
.section
->gc_mark
))
6305 h
->dynindx
= (*idx
)++;
6310 /* Propogate collected vtable information. This is called through
6311 elf_link_hash_traverse. */
6314 elf_gc_propagate_vtable_entries_used (h
, okp
)
6315 struct elf_link_hash_entry
*h
;
6318 /* Those that are not vtables. */
6319 if (h
->vtable_parent
== NULL
)
6322 /* Those vtables that do not have parents, we cannot merge. */
6323 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6326 /* If we've already been done, exit. */
6327 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6330 /* Make sure the parent's table is up to date. */
6331 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6333 if (h
->vtable_entries_used
== NULL
)
6335 /* None of this table's entries were referenced. Re-use the
6337 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6338 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6345 /* Or the parent's entries into ours. */
6346 cu
= h
->vtable_entries_used
;
6348 pu
= h
->vtable_parent
->vtable_entries_used
;
6351 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6354 if (*pu
) *cu
= true;
6364 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6365 struct elf_link_hash_entry
*h
;
6369 bfd_vma hstart
, hend
;
6370 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6371 struct elf_backend_data
*bed
;
6373 /* Take care of both those symbols that do not describe vtables as
6374 well as those that are not loaded. */
6375 if (h
->vtable_parent
== NULL
)
6378 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6379 || h
->root
.type
== bfd_link_hash_defweak
);
6381 sec
= h
->root
.u
.def
.section
;
6382 hstart
= h
->root
.u
.def
.value
;
6383 hend
= hstart
+ h
->size
;
6385 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6386 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6388 return *(boolean
*)okp
= false;
6389 bed
= get_elf_backend_data (sec
->owner
);
6390 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6392 for (rel
= relstart
; rel
< relend
; ++rel
)
6393 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6395 /* If the entry is in use, do nothing. */
6396 if (h
->vtable_entries_used
6397 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6399 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6400 if (h
->vtable_entries_used
[entry
])
6403 /* Otherwise, kill it. */
6404 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6410 /* Do mark and sweep of unused sections. */
6413 elf_gc_sections (abfd
, info
)
6415 struct bfd_link_info
*info
;
6419 asection
* (*gc_mark_hook
)
6420 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6421 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6423 if (!get_elf_backend_data (abfd
)->can_gc_sections
6424 || info
->relocateable
6425 || elf_hash_table (info
)->dynamic_sections_created
)
6428 /* Apply transitive closure to the vtable entry usage info. */
6429 elf_link_hash_traverse (elf_hash_table (info
),
6430 elf_gc_propagate_vtable_entries_used
,
6435 /* Kill the vtable relocations that were not used. */
6436 elf_link_hash_traverse (elf_hash_table (info
),
6437 elf_gc_smash_unused_vtentry_relocs
,
6442 /* Grovel through relocs to find out who stays ... */
6444 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6445 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6449 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6452 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6454 if (o
->flags
& SEC_KEEP
)
6455 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6460 /* ... and mark SEC_EXCLUDE for those that go. */
6461 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6467 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6470 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6473 struct elf_link_hash_entry
*h
;
6476 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6477 struct elf_link_hash_entry
**search
, *child
;
6478 bfd_size_type extsymcount
;
6480 /* The sh_info field of the symtab header tells us where the
6481 external symbols start. We don't care about the local symbols at
6483 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6484 if (!elf_bad_symtab (abfd
))
6485 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6487 sym_hashes
= elf_sym_hashes (abfd
);
6488 sym_hashes_end
= sym_hashes
+ extsymcount
;
6490 /* Hunt down the child symbol, which is in this section at the same
6491 offset as the relocation. */
6492 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6494 if ((child
= *search
) != NULL
6495 && (child
->root
.type
== bfd_link_hash_defined
6496 || child
->root
.type
== bfd_link_hash_defweak
)
6497 && child
->root
.u
.def
.section
== sec
6498 && child
->root
.u
.def
.value
== offset
)
6502 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6503 bfd_get_filename (abfd
), sec
->name
,
6504 (unsigned long)offset
);
6505 bfd_set_error (bfd_error_invalid_operation
);
6511 /* This *should* only be the absolute section. It could potentially
6512 be that someone has defined a non-global vtable though, which
6513 would be bad. It isn't worth paging in the local symbols to be
6514 sure though; that case should simply be handled by the assembler. */
6516 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6519 child
->vtable_parent
= h
;
6524 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6527 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6528 bfd
*abfd ATTRIBUTE_UNUSED
;
6529 asection
*sec ATTRIBUTE_UNUSED
;
6530 struct elf_link_hash_entry
*h
;
6533 if (addend
>= h
->vtable_entries_size
)
6536 boolean
*ptr
= h
->vtable_entries_used
;
6538 /* While the symbol is undefined, we have to be prepared to handle
6540 if (h
->root
.type
== bfd_link_hash_undefined
)
6547 /* Oops! We've got a reference past the defined end of
6548 the table. This is probably a bug -- shall we warn? */
6553 /* Allocate one extra entry for use as a "done" flag for the
6554 consolidation pass. */
6555 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof (boolean
);
6559 ptr
= bfd_realloc (ptr
- 1, bytes
);
6565 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof (boolean
);
6566 memset (((char *)ptr
) + oldbytes
, 0, bytes
- oldbytes
);
6570 ptr
= bfd_zmalloc (bytes
);
6575 /* And arrange for that done flag to be at index -1. */
6576 h
->vtable_entries_used
= ptr
+ 1;
6577 h
->vtable_entries_size
= size
;
6580 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6585 /* And an accompanying bit to work out final got entry offsets once
6586 we're done. Should be called from final_link. */
6589 elf_gc_common_finalize_got_offsets (abfd
, info
)
6591 struct bfd_link_info
*info
;
6594 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6597 /* The GOT offset is relative to the .got section, but the GOT header is
6598 put into the .got.plt section, if the backend uses it. */
6599 if (bed
->want_got_plt
)
6602 gotoff
= bed
->got_header_size
;
6604 /* Do the local .got entries first. */
6605 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6607 bfd_signed_vma
*local_got
;
6608 bfd_size_type j
, locsymcount
;
6609 Elf_Internal_Shdr
*symtab_hdr
;
6611 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
6614 local_got
= elf_local_got_refcounts (i
);
6618 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6619 if (elf_bad_symtab (i
))
6620 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6622 locsymcount
= symtab_hdr
->sh_info
;
6624 for (j
= 0; j
< locsymcount
; ++j
)
6626 if (local_got
[j
] > 0)
6628 local_got
[j
] = gotoff
;
6629 gotoff
+= ARCH_SIZE
/ 8;
6632 local_got
[j
] = (bfd_vma
) -1;
6636 /* Then the global .got entries. .plt refcounts are handled by
6637 adjust_dynamic_symbol */
6638 elf_link_hash_traverse (elf_hash_table (info
),
6639 elf_gc_allocate_got_offsets
,
6644 /* We need a special top-level link routine to convert got reference counts
6645 to real got offsets. */
6648 elf_gc_allocate_got_offsets (h
, offarg
)
6649 struct elf_link_hash_entry
*h
;
6652 bfd_vma
*off
= (bfd_vma
*) offarg
;
6654 if (h
->got
.refcount
> 0)
6656 h
->got
.offset
= off
[0];
6657 off
[0] += ARCH_SIZE
/ 8;
6660 h
->got
.offset
= (bfd_vma
) -1;
6665 /* Many folk need no more in the way of final link than this, once
6666 got entry reference counting is enabled. */
6669 elf_gc_common_final_link (abfd
, info
)
6671 struct bfd_link_info
*info
;
6673 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6676 /* Invoke the regular ELF backend linker to do all the work. */
6677 return elf_bfd_final_link (abfd
, info
);
6680 /* This function will be called though elf_link_hash_traverse to store
6681 all hash value of the exported symbols in an array. */
6684 elf_collect_hash_codes (h
, data
)
6685 struct elf_link_hash_entry
*h
;
6688 unsigned long **valuep
= (unsigned long **) data
;
6694 /* Ignore indirect symbols. These are added by the versioning code. */
6695 if (h
->dynindx
== -1)
6698 name
= h
->root
.root
.string
;
6699 p
= strchr (name
, ELF_VER_CHR
);
6702 alc
= bfd_malloc (p
- name
+ 1);
6703 memcpy (alc
, name
, p
- name
);
6704 alc
[p
- name
] = '\0';
6708 /* Compute the hash value. */
6709 ha
= bfd_elf_hash (name
);
6711 /* Store the found hash value in the array given as the argument. */
6714 /* And store it in the struct so that we can put it in the hash table
6716 h
->elf_hash_value
= ha
;