2 Copyright 1995, 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*, boolean
));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_collect_hash_codes
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
53 static boolean elf_link_read_relocs_from_section
54 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
55 static void elf_link_output_relocs
56 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
57 static boolean elf_link_size_reloc_section
58 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
59 static void elf_link_adjust_relocs
60 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
61 struct elf_link_hash_entry
**));
63 /* Given an ELF BFD, add symbols to the global hash table as
67 elf_bfd_link_add_symbols (abfd
, info
)
69 struct bfd_link_info
*info
;
71 switch (bfd_get_format (abfd
))
74 return elf_link_add_object_symbols (abfd
, info
);
76 return elf_link_add_archive_symbols (abfd
, info
);
78 bfd_set_error (bfd_error_wrong_format
);
83 /* Return true iff this is a non-common definition of a symbol. */
85 is_global_symbol_definition (abfd
, sym
)
86 bfd
* abfd ATTRIBUTE_UNUSED
;
87 Elf_Internal_Sym
* sym
;
89 /* Local symbols do not count, but target specific ones might. */
90 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
91 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
94 /* If the section is undefined, then so is the symbol. */
95 if (sym
->st_shndx
== SHN_UNDEF
)
98 /* If the symbol is defined in the common section, then
99 it is a common definition and so does not count. */
100 if (sym
->st_shndx
== SHN_COMMON
)
103 /* If the symbol is in a target specific section then we
104 must rely upon the backend to tell us what it is. */
105 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
106 /* FIXME - this function is not coded yet:
108 return _bfd_is_global_symbol_definition (abfd, sym);
110 Instead for now assume that the definition is not global,
111 Even if this is wrong, at least the linker will behave
112 in the same way that it used to do. */
119 /* Search the symbol table of the archive element of the archive ABFD
120 whoes archove map contains a mention of SYMDEF, and determine if
121 the symbol is defined in this element. */
123 elf_link_is_defined_archive_symbol (abfd
, symdef
)
127 Elf_Internal_Shdr
* hdr
;
128 Elf_External_Sym
* esym
;
129 Elf_External_Sym
* esymend
;
130 Elf_External_Sym
* buf
= NULL
;
134 boolean result
= false;
136 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
137 if (abfd
== (bfd
*) NULL
)
140 if (! bfd_check_format (abfd
, bfd_object
))
143 /* If we have already included the element containing this symbol in the
144 link then we do not need to include it again. Just claim that any symbol
145 it contains is not a definition, so that our caller will not decide to
146 (re)include this element. */
147 if (abfd
->archive_pass
)
150 /* Select the appropriate symbol table. */
151 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
152 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
154 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
156 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
158 /* The sh_info field of the symtab header tells us where the
159 external symbols start. We don't care about the local symbols. */
160 if (elf_bad_symtab (abfd
))
162 extsymcount
= symcount
;
167 extsymcount
= symcount
- hdr
->sh_info
;
168 extsymoff
= hdr
->sh_info
;
171 buf
= ((Elf_External_Sym
*)
172 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
173 if (buf
== NULL
&& extsymcount
!= 0)
176 /* Read in the symbol table.
177 FIXME: This ought to be cached somewhere. */
179 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
181 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
182 != extsymcount
* sizeof (Elf_External_Sym
)))
188 /* Scan the symbol table looking for SYMDEF. */
189 esymend
= buf
+ extsymcount
;
194 Elf_Internal_Sym sym
;
197 elf_swap_symbol_in (abfd
, esym
, & sym
);
199 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
200 if (name
== (const char *) NULL
)
203 if (strcmp (name
, symdef
->name
) == 0)
205 result
= is_global_symbol_definition (abfd
, & sym
);
216 /* Add symbols from an ELF archive file to the linker hash table. We
217 don't use _bfd_generic_link_add_archive_symbols because of a
218 problem which arises on UnixWare. The UnixWare libc.so is an
219 archive which includes an entry libc.so.1 which defines a bunch of
220 symbols. The libc.so archive also includes a number of other
221 object files, which also define symbols, some of which are the same
222 as those defined in libc.so.1. Correct linking requires that we
223 consider each object file in turn, and include it if it defines any
224 symbols we need. _bfd_generic_link_add_archive_symbols does not do
225 this; it looks through the list of undefined symbols, and includes
226 any object file which defines them. When this algorithm is used on
227 UnixWare, it winds up pulling in libc.so.1 early and defining a
228 bunch of symbols. This means that some of the other objects in the
229 archive are not included in the link, which is incorrect since they
230 precede libc.so.1 in the archive.
232 Fortunately, ELF archive handling is simpler than that done by
233 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
234 oddities. In ELF, if we find a symbol in the archive map, and the
235 symbol is currently undefined, we know that we must pull in that
238 Unfortunately, we do have to make multiple passes over the symbol
239 table until nothing further is resolved. */
242 elf_link_add_archive_symbols (abfd
, info
)
244 struct bfd_link_info
*info
;
247 boolean
*defined
= NULL
;
248 boolean
*included
= NULL
;
252 if (! bfd_has_map (abfd
))
254 /* An empty archive is a special case. */
255 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
257 bfd_set_error (bfd_error_no_armap
);
261 /* Keep track of all symbols we know to be already defined, and all
262 files we know to be already included. This is to speed up the
263 second and subsequent passes. */
264 c
= bfd_ardata (abfd
)->symdef_count
;
267 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
268 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
269 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
271 memset (defined
, 0, c
* sizeof (boolean
));
272 memset (included
, 0, c
* sizeof (boolean
));
274 symdefs
= bfd_ardata (abfd
)->symdefs
;
287 symdefend
= symdef
+ c
;
288 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
290 struct elf_link_hash_entry
*h
;
292 struct bfd_link_hash_entry
*undefs_tail
;
295 if (defined
[i
] || included
[i
])
297 if (symdef
->file_offset
== last
)
303 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
304 false, false, false);
310 /* If this is a default version (the name contains @@),
311 look up the symbol again without the version. The
312 effect is that references to the symbol without the
313 version will be matched by the default symbol in the
316 p
= strchr (symdef
->name
, ELF_VER_CHR
);
317 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
320 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
323 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
324 copy
[p
- symdef
->name
] = '\0';
326 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
327 false, false, false);
329 bfd_release (abfd
, copy
);
335 if (h
->root
.type
== bfd_link_hash_common
)
337 /* We currently have a common symbol. The archive map contains
338 a reference to this symbol, so we may want to include it. We
339 only want to include it however, if this archive element
340 contains a definition of the symbol, not just another common
343 Unfortunately some archivers (including GNU ar) will put
344 declarations of common symbols into their archive maps, as
345 well as real definitions, so we cannot just go by the archive
346 map alone. Instead we must read in the element's symbol
347 table and check that to see what kind of symbol definition
349 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
352 else if (h
->root
.type
!= bfd_link_hash_undefined
)
354 if (h
->root
.type
!= bfd_link_hash_undefweak
)
359 /* We need to include this archive member. */
360 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
361 if (element
== (bfd
*) NULL
)
364 if (! bfd_check_format (element
, bfd_object
))
367 /* Doublecheck that we have not included this object
368 already--it should be impossible, but there may be
369 something wrong with the archive. */
370 if (element
->archive_pass
!= 0)
372 bfd_set_error (bfd_error_bad_value
);
375 element
->archive_pass
= 1;
377 undefs_tail
= info
->hash
->undefs_tail
;
379 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
382 if (! elf_link_add_object_symbols (element
, info
))
385 /* If there are any new undefined symbols, we need to make
386 another pass through the archive in order to see whether
387 they can be defined. FIXME: This isn't perfect, because
388 common symbols wind up on undefs_tail and because an
389 undefined symbol which is defined later on in this pass
390 does not require another pass. This isn't a bug, but it
391 does make the code less efficient than it could be. */
392 if (undefs_tail
!= info
->hash
->undefs_tail
)
395 /* Look backward to mark all symbols from this object file
396 which we have already seen in this pass. */
400 included
[mark
] = true;
405 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
407 /* We mark subsequent symbols from this object file as we go
408 on through the loop. */
409 last
= symdef
->file_offset
;
420 if (defined
!= (boolean
*) NULL
)
422 if (included
!= (boolean
*) NULL
)
427 /* This function is called when we want to define a new symbol. It
428 handles the various cases which arise when we find a definition in
429 a dynamic object, or when there is already a definition in a
430 dynamic object. The new symbol is described by NAME, SYM, PSEC,
431 and PVALUE. We set SYM_HASH to the hash table entry. We set
432 OVERRIDE if the old symbol is overriding a new definition. We set
433 TYPE_CHANGE_OK if it is OK for the type to change. We set
434 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
435 change, we mean that we shouldn't warn if the type or size does
436 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
440 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
441 override
, type_change_ok
, size_change_ok
, dt_needed
)
443 struct bfd_link_info
*info
;
445 Elf_Internal_Sym
*sym
;
448 struct elf_link_hash_entry
**sym_hash
;
450 boolean
*type_change_ok
;
451 boolean
*size_change_ok
;
455 struct elf_link_hash_entry
*h
;
458 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
463 bind
= ELF_ST_BIND (sym
->st_info
);
465 if (! bfd_is_und_section (sec
))
466 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
468 h
= ((struct elf_link_hash_entry
*)
469 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
474 /* This code is for coping with dynamic objects, and is only useful
475 if we are doing an ELF link. */
476 if (info
->hash
->creator
!= abfd
->xvec
)
479 /* For merging, we only care about real symbols. */
481 while (h
->root
.type
== bfd_link_hash_indirect
482 || h
->root
.type
== bfd_link_hash_warning
)
483 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
485 /* If we just created the symbol, mark it as being an ELF symbol.
486 Other than that, there is nothing to do--there is no merge issue
487 with a newly defined symbol--so we just return. */
489 if (h
->root
.type
== bfd_link_hash_new
)
491 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
495 /* OLDBFD is a BFD associated with the existing symbol. */
497 switch (h
->root
.type
)
503 case bfd_link_hash_undefined
:
504 case bfd_link_hash_undefweak
:
505 oldbfd
= h
->root
.u
.undef
.abfd
;
508 case bfd_link_hash_defined
:
509 case bfd_link_hash_defweak
:
510 oldbfd
= h
->root
.u
.def
.section
->owner
;
513 case bfd_link_hash_common
:
514 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
518 /* In cases involving weak versioned symbols, we may wind up trying
519 to merge a symbol with itself. Catch that here, to avoid the
520 confusion that results if we try to override a symbol with
521 itself. The additional tests catch cases like
522 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
523 dynamic object, which we do want to handle here. */
525 && ((abfd
->flags
& DYNAMIC
) == 0
526 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
529 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
530 respectively, is from a dynamic object. */
532 if ((abfd
->flags
& DYNAMIC
) != 0)
538 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
543 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
544 indices used by MIPS ELF. */
545 switch (h
->root
.type
)
551 case bfd_link_hash_defined
:
552 case bfd_link_hash_defweak
:
553 hsec
= h
->root
.u
.def
.section
;
556 case bfd_link_hash_common
:
557 hsec
= h
->root
.u
.c
.p
->section
;
564 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
567 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
568 respectively, appear to be a definition rather than reference. */
570 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
575 if (h
->root
.type
== bfd_link_hash_undefined
576 || h
->root
.type
== bfd_link_hash_undefweak
577 || h
->root
.type
== bfd_link_hash_common
)
582 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
583 symbol, respectively, appears to be a common symbol in a dynamic
584 object. If a symbol appears in an uninitialized section, and is
585 not weak, and is not a function, then it may be a common symbol
586 which was resolved when the dynamic object was created. We want
587 to treat such symbols specially, because they raise special
588 considerations when setting the symbol size: if the symbol
589 appears as a common symbol in a regular object, and the size in
590 the regular object is larger, we must make sure that we use the
591 larger size. This problematic case can always be avoided in C,
592 but it must be handled correctly when using Fortran shared
595 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
596 likewise for OLDDYNCOMMON and OLDDEF.
598 Note that this test is just a heuristic, and that it is quite
599 possible to have an uninitialized symbol in a shared object which
600 is really a definition, rather than a common symbol. This could
601 lead to some minor confusion when the symbol really is a common
602 symbol in some regular object. However, I think it will be
607 && (sec
->flags
& SEC_ALLOC
) != 0
608 && (sec
->flags
& SEC_LOAD
) == 0
611 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
614 newdyncommon
= false;
618 && h
->root
.type
== bfd_link_hash_defined
619 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
620 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
621 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
623 && h
->type
!= STT_FUNC
)
626 olddyncommon
= false;
628 /* It's OK to change the type if either the existing symbol or the
629 new symbol is weak unless it comes from a DT_NEEDED entry of
630 a shared object, in which case, the DT_NEEDED entry may not be
631 required at the run time. */
633 if ((! dt_needed
&& h
->root
.type
== bfd_link_hash_defweak
)
634 || h
->root
.type
== bfd_link_hash_undefweak
636 *type_change_ok
= true;
638 /* It's OK to change the size if either the existing symbol or the
639 new symbol is weak, or if the old symbol is undefined. */
642 || h
->root
.type
== bfd_link_hash_undefined
)
643 *size_change_ok
= true;
645 /* If both the old and the new symbols look like common symbols in a
646 dynamic object, set the size of the symbol to the larger of the
651 && sym
->st_size
!= h
->size
)
653 /* Since we think we have two common symbols, issue a multiple
654 common warning if desired. Note that we only warn if the
655 size is different. If the size is the same, we simply let
656 the old symbol override the new one as normally happens with
657 symbols defined in dynamic objects. */
659 if (! ((*info
->callbacks
->multiple_common
)
660 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
661 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
664 if (sym
->st_size
> h
->size
)
665 h
->size
= sym
->st_size
;
667 *size_change_ok
= true;
670 /* If we are looking at a dynamic object, and we have found a
671 definition, we need to see if the symbol was already defined by
672 some other object. If so, we want to use the existing
673 definition, and we do not want to report a multiple symbol
674 definition error; we do this by clobbering *PSEC to be
677 We treat a common symbol as a definition if the symbol in the
678 shared library is a function, since common symbols always
679 represent variables; this can cause confusion in principle, but
680 any such confusion would seem to indicate an erroneous program or
681 shared library. We also permit a common symbol in a regular
682 object to override a weak symbol in a shared object.
684 We prefer a non-weak definition in a shared library to a weak
685 definition in the executable unless it comes from a DT_NEEDED
686 entry of a shared object, in which case, the DT_NEEDED entry
687 may not be required at the run time. */
692 || (h
->root
.type
== bfd_link_hash_common
694 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
695 && (h
->root
.type
!= bfd_link_hash_defweak
697 || bind
== STB_WEAK
))
701 newdyncommon
= false;
703 *psec
= sec
= bfd_und_section_ptr
;
704 *size_change_ok
= true;
706 /* If we get here when the old symbol is a common symbol, then
707 we are explicitly letting it override a weak symbol or
708 function in a dynamic object, and we don't want to warn about
709 a type change. If the old symbol is a defined symbol, a type
710 change warning may still be appropriate. */
712 if (h
->root
.type
== bfd_link_hash_common
)
713 *type_change_ok
= true;
716 /* Handle the special case of an old common symbol merging with a
717 new symbol which looks like a common symbol in a shared object.
718 We change *PSEC and *PVALUE to make the new symbol look like a
719 common symbol, and let _bfd_generic_link_add_one_symbol will do
723 && h
->root
.type
== bfd_link_hash_common
)
727 newdyncommon
= false;
728 *pvalue
= sym
->st_size
;
729 *psec
= sec
= bfd_com_section_ptr
;
730 *size_change_ok
= true;
733 /* If the old symbol is from a dynamic object, and the new symbol is
734 a definition which is not from a dynamic object, then the new
735 symbol overrides the old symbol. Symbols from regular files
736 always take precedence over symbols from dynamic objects, even if
737 they are defined after the dynamic object in the link.
739 As above, we again permit a common symbol in a regular object to
740 override a definition in a shared object if the shared object
741 symbol is a function or is weak.
743 As above, we permit a non-weak definition in a shared object to
744 override a weak definition in a regular object. */
748 || (bfd_is_com_section (sec
)
749 && (h
->root
.type
== bfd_link_hash_defweak
750 || h
->type
== STT_FUNC
)))
753 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
755 || h
->root
.type
== bfd_link_hash_defweak
))
757 /* Change the hash table entry to undefined, and let
758 _bfd_generic_link_add_one_symbol do the right thing with the
761 h
->root
.type
= bfd_link_hash_undefined
;
762 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
763 *size_change_ok
= true;
766 olddyncommon
= false;
768 /* We again permit a type change when a common symbol may be
769 overriding a function. */
771 if (bfd_is_com_section (sec
))
772 *type_change_ok
= true;
774 /* This union may have been set to be non-NULL when this symbol
775 was seen in a dynamic object. We must force the union to be
776 NULL, so that it is correct for a regular symbol. */
778 h
->verinfo
.vertree
= NULL
;
780 /* In this special case, if H is the target of an indirection,
781 we want the caller to frob with H rather than with the
782 indirect symbol. That will permit the caller to redefine the
783 target of the indirection, rather than the indirect symbol
784 itself. FIXME: This will break the -y option if we store a
785 symbol with a different name. */
789 /* Handle the special case of a new common symbol merging with an
790 old symbol that looks like it might be a common symbol defined in
791 a shared object. Note that we have already handled the case in
792 which a new common symbol should simply override the definition
793 in the shared library. */
796 && bfd_is_com_section (sec
)
799 /* It would be best if we could set the hash table entry to a
800 common symbol, but we don't know what to use for the section
802 if (! ((*info
->callbacks
->multiple_common
)
803 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
804 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
807 /* If the predumed common symbol in the dynamic object is
808 larger, pretend that the new symbol has its size. */
810 if (h
->size
> *pvalue
)
813 /* FIXME: We no longer know the alignment required by the symbol
814 in the dynamic object, so we just wind up using the one from
815 the regular object. */
818 olddyncommon
= false;
820 h
->root
.type
= bfd_link_hash_undefined
;
821 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
823 *size_change_ok
= true;
824 *type_change_ok
= true;
826 h
->verinfo
.vertree
= NULL
;
829 /* Handle the special case of a weak definition in a regular object
830 followed by a non-weak definition in a shared object. In this
831 case, we prefer the definition in the shared object unless it
832 comes from a DT_NEEDED entry of a shared object, in which case,
833 the DT_NEEDED entry may not be required at the run time. */
836 && h
->root
.type
== bfd_link_hash_defweak
841 /* To make this work we have to frob the flags so that the rest
842 of the code does not think we are using the regular
844 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
845 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
846 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
847 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
848 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
849 | ELF_LINK_HASH_DEF_DYNAMIC
);
851 /* If H is the target of an indirection, we want the caller to
852 use H rather than the indirect symbol. Otherwise if we are
853 defining a new indirect symbol we will wind up attaching it
854 to the entry we are overriding. */
858 /* Handle the special case of a non-weak definition in a shared
859 object followed by a weak definition in a regular object. In
860 this case we prefer to definition in the shared object. To make
861 this work we have to tell the caller to not treat the new symbol
865 && h
->root
.type
!= bfd_link_hash_defweak
874 /* Add symbols from an ELF object file to the linker hash table. */
877 elf_link_add_object_symbols (abfd
, info
)
879 struct bfd_link_info
*info
;
881 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
882 const Elf_Internal_Sym
*,
883 const char **, flagword
*,
884 asection
**, bfd_vma
*));
885 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
886 asection
*, const Elf_Internal_Rela
*));
888 Elf_Internal_Shdr
*hdr
;
892 Elf_External_Sym
*buf
= NULL
;
893 struct elf_link_hash_entry
**sym_hash
;
895 bfd_byte
*dynver
= NULL
;
896 Elf_External_Versym
*extversym
= NULL
;
897 Elf_External_Versym
*ever
;
898 Elf_External_Dyn
*dynbuf
= NULL
;
899 struct elf_link_hash_entry
*weaks
;
900 Elf_External_Sym
*esym
;
901 Elf_External_Sym
*esymend
;
902 struct elf_backend_data
*bed
;
905 bed
= get_elf_backend_data (abfd
);
906 add_symbol_hook
= bed
->elf_add_symbol_hook
;
907 collect
= bed
->collect
;
909 if ((abfd
->flags
& DYNAMIC
) == 0)
915 /* You can't use -r against a dynamic object. Also, there's no
916 hope of using a dynamic object which does not exactly match
917 the format of the output file. */
918 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
920 bfd_set_error (bfd_error_invalid_operation
);
925 /* As a GNU extension, any input sections which are named
926 .gnu.warning.SYMBOL are treated as warning symbols for the given
927 symbol. This differs from .gnu.warning sections, which generate
928 warnings when they are included in an output file. */
933 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
937 name
= bfd_get_section_name (abfd
, s
);
938 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
943 name
+= sizeof ".gnu.warning." - 1;
945 /* If this is a shared object, then look up the symbol
946 in the hash table. If it is there, and it is already
947 been defined, then we will not be using the entry
948 from this shared object, so we don't need to warn.
949 FIXME: If we see the definition in a regular object
950 later on, we will warn, but we shouldn't. The only
951 fix is to keep track of what warnings we are supposed
952 to emit, and then handle them all at the end of the
954 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
956 struct elf_link_hash_entry
*h
;
958 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
961 /* FIXME: What about bfd_link_hash_common? */
963 && (h
->root
.type
== bfd_link_hash_defined
964 || h
->root
.type
== bfd_link_hash_defweak
))
966 /* We don't want to issue this warning. Clobber
967 the section size so that the warning does not
968 get copied into the output file. */
974 sz
= bfd_section_size (abfd
, s
);
975 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
979 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
984 if (! (_bfd_generic_link_add_one_symbol
985 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
986 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
989 if (! info
->relocateable
)
991 /* Clobber the section size so that the warning does
992 not get copied into the output file. */
999 /* If this is a dynamic object, we always link against the .dynsym
1000 symbol table, not the .symtab symbol table. The dynamic linker
1001 will only see the .dynsym symbol table, so there is no reason to
1002 look at .symtab for a dynamic object. */
1004 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
1005 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1007 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1011 /* Read in any version definitions. */
1013 if (! _bfd_elf_slurp_version_tables (abfd
))
1016 /* Read in the symbol versions, but don't bother to convert them
1017 to internal format. */
1018 if (elf_dynversym (abfd
) != 0)
1020 Elf_Internal_Shdr
*versymhdr
;
1022 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1023 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
1024 if (extversym
== NULL
)
1026 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1027 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
1028 != versymhdr
->sh_size
))
1033 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1035 /* The sh_info field of the symtab header tells us where the
1036 external symbols start. We don't care about the local symbols at
1038 if (elf_bad_symtab (abfd
))
1040 extsymcount
= symcount
;
1045 extsymcount
= symcount
- hdr
->sh_info
;
1046 extsymoff
= hdr
->sh_info
;
1049 buf
= ((Elf_External_Sym
*)
1050 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
1051 if (buf
== NULL
&& extsymcount
!= 0)
1054 /* We store a pointer to the hash table entry for each external
1056 sym_hash
= ((struct elf_link_hash_entry
**)
1058 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
1059 if (sym_hash
== NULL
)
1061 elf_sym_hashes (abfd
) = sym_hash
;
1067 /* If we are creating a shared library, create all the dynamic
1068 sections immediately. We need to attach them to something,
1069 so we attach them to this BFD, provided it is the right
1070 format. FIXME: If there are no input BFD's of the same
1071 format as the output, we can't make a shared library. */
1073 && ! elf_hash_table (info
)->dynamic_sections_created
1074 && abfd
->xvec
== info
->hash
->creator
)
1076 if (! elf_link_create_dynamic_sections (abfd
, info
))
1085 bfd_size_type oldsize
;
1086 bfd_size_type strindex
;
1088 /* Find the name to use in a DT_NEEDED entry that refers to this
1089 object. If the object has a DT_SONAME entry, we use it.
1090 Otherwise, if the generic linker stuck something in
1091 elf_dt_name, we use that. Otherwise, we just use the file
1092 name. If the generic linker put a null string into
1093 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1094 there is a DT_SONAME entry. */
1096 name
= bfd_get_filename (abfd
);
1097 if (elf_dt_name (abfd
) != NULL
)
1099 name
= elf_dt_name (abfd
);
1102 if (elf_dt_soname (abfd
) != NULL
)
1108 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1111 Elf_External_Dyn
*extdyn
;
1112 Elf_External_Dyn
*extdynend
;
1118 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
1122 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1123 (file_ptr
) 0, s
->_raw_size
))
1126 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1129 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1132 /* The shared libraries distributed with hpux11 have a bogus
1133 sh_link field for the ".dynamic" section. This code detects
1134 when LINK refers to a section that is not a string table and
1135 tries to find the string table for the ".dynsym" section
1137 Elf_Internal_Shdr
*hdr
= elf_elfsections (abfd
)[link
];
1138 if (hdr
->sh_type
!= SHT_STRTAB
)
1140 asection
*s
= bfd_get_section_by_name (abfd
, ".dynsym");
1141 int elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1144 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1149 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1152 for (; extdyn
< extdynend
; extdyn
++)
1154 Elf_Internal_Dyn dyn
;
1156 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1157 if (dyn
.d_tag
== DT_SONAME
)
1159 name
= bfd_elf_string_from_elf_section (abfd
, link
,
1164 if (dyn
.d_tag
== DT_NEEDED
)
1166 struct bfd_link_needed_list
*n
, **pn
;
1169 n
= ((struct bfd_link_needed_list
*)
1170 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1171 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1173 if (n
== NULL
|| fnm
== NULL
)
1175 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1182 for (pn
= &elf_hash_table (info
)->needed
;
1188 if (dyn
.d_tag
== DT_RUNPATH
)
1190 struct bfd_link_needed_list
*n
, **pn
;
1193 /* When we see DT_RPATH before DT_RUNPATH, we have
1194 to clear runpath. Do _NOT_ bfd_release, as that
1195 frees all more recently bfd_alloc'd blocks as
1197 if (rpath
&& elf_hash_table (info
)->runpath
)
1198 elf_hash_table (info
)->runpath
= NULL
;
1200 n
= ((struct bfd_link_needed_list
*)
1201 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1202 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1204 if (n
== NULL
|| fnm
== NULL
)
1206 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1213 for (pn
= &elf_hash_table (info
)->runpath
;
1221 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1222 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
1224 struct bfd_link_needed_list
*n
, **pn
;
1227 n
= ((struct bfd_link_needed_list
*)
1228 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1229 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1231 if (n
== NULL
|| fnm
== NULL
)
1233 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1240 for (pn
= &elf_hash_table (info
)->runpath
;
1253 /* We do not want to include any of the sections in a dynamic
1254 object in the output file. We hack by simply clobbering the
1255 list of sections in the BFD. This could be handled more
1256 cleanly by, say, a new section flag; the existing
1257 SEC_NEVER_LOAD flag is not the one we want, because that one
1258 still implies that the section takes up space in the output
1260 abfd
->sections
= NULL
;
1261 abfd
->section_count
= 0;
1263 /* If this is the first dynamic object found in the link, create
1264 the special sections required for dynamic linking. */
1265 if (! elf_hash_table (info
)->dynamic_sections_created
)
1267 if (! elf_link_create_dynamic_sections (abfd
, info
))
1273 /* Add a DT_NEEDED entry for this dynamic object. */
1274 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1275 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1277 if (strindex
== (bfd_size_type
) -1)
1280 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1283 Elf_External_Dyn
*dyncon
, *dynconend
;
1285 /* The hash table size did not change, which means that
1286 the dynamic object name was already entered. If we
1287 have already included this dynamic object in the
1288 link, just ignore it. There is no reason to include
1289 a particular dynamic object more than once. */
1290 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1292 BFD_ASSERT (sdyn
!= NULL
);
1294 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1295 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1297 for (; dyncon
< dynconend
; dyncon
++)
1299 Elf_Internal_Dyn dyn
;
1301 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1303 if (dyn
.d_tag
== DT_NEEDED
1304 && dyn
.d_un
.d_val
== strindex
)
1308 if (extversym
!= NULL
)
1315 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1319 /* Save the SONAME, if there is one, because sometimes the
1320 linker emulation code will need to know it. */
1322 name
= bfd_get_filename (abfd
);
1323 elf_dt_name (abfd
) = name
;
1327 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1329 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1330 != extsymcount
* sizeof (Elf_External_Sym
)))
1335 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1336 esymend
= buf
+ extsymcount
;
1339 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1341 Elf_Internal_Sym sym
;
1347 struct elf_link_hash_entry
*h
;
1349 boolean size_change_ok
, type_change_ok
;
1350 boolean new_weakdef
;
1351 unsigned int old_alignment
;
1353 elf_swap_symbol_in (abfd
, esym
, &sym
);
1355 flags
= BSF_NO_FLAGS
;
1357 value
= sym
.st_value
;
1360 bind
= ELF_ST_BIND (sym
.st_info
);
1361 if (bind
== STB_LOCAL
)
1363 /* This should be impossible, since ELF requires that all
1364 global symbols follow all local symbols, and that sh_info
1365 point to the first global symbol. Unfortunatealy, Irix 5
1369 else if (bind
== STB_GLOBAL
)
1371 if (sym
.st_shndx
!= SHN_UNDEF
1372 && sym
.st_shndx
!= SHN_COMMON
)
1377 else if (bind
== STB_WEAK
)
1381 /* Leave it up to the processor backend. */
1384 if (sym
.st_shndx
== SHN_UNDEF
)
1385 sec
= bfd_und_section_ptr
;
1386 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1388 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1390 sec
= bfd_abs_section_ptr
;
1391 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1394 else if (sym
.st_shndx
== SHN_ABS
)
1395 sec
= bfd_abs_section_ptr
;
1396 else if (sym
.st_shndx
== SHN_COMMON
)
1398 sec
= bfd_com_section_ptr
;
1399 /* What ELF calls the size we call the value. What ELF
1400 calls the value we call the alignment. */
1401 value
= sym
.st_size
;
1405 /* Leave it up to the processor backend. */
1408 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1409 if (name
== (const char *) NULL
)
1412 if (add_symbol_hook
)
1414 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1418 /* The hook function sets the name to NULL if this symbol
1419 should be skipped for some reason. */
1420 if (name
== (const char *) NULL
)
1424 /* Sanity check that all possibilities were handled. */
1425 if (sec
== (asection
*) NULL
)
1427 bfd_set_error (bfd_error_bad_value
);
1431 if (bfd_is_und_section (sec
)
1432 || bfd_is_com_section (sec
))
1437 size_change_ok
= false;
1438 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1440 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1442 Elf_Internal_Versym iver
;
1443 unsigned int vernum
= 0;
1448 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1449 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1451 /* If this is a hidden symbol, or if it is not version
1452 1, we append the version name to the symbol name.
1453 However, we do not modify a non-hidden absolute
1454 symbol, because it might be the version symbol
1455 itself. FIXME: What if it isn't? */
1456 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1457 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1460 int namelen
, newlen
;
1463 if (sym
.st_shndx
!= SHN_UNDEF
)
1465 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1467 (*_bfd_error_handler
)
1468 (_("%s: %s: invalid version %u (max %d)"),
1469 bfd_get_filename (abfd
), name
, vernum
,
1470 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1471 bfd_set_error (bfd_error_bad_value
);
1474 else if (vernum
> 1)
1476 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1482 /* We cannot simply test for the number of
1483 entries in the VERNEED section since the
1484 numbers for the needed versions do not start
1486 Elf_Internal_Verneed
*t
;
1489 for (t
= elf_tdata (abfd
)->verref
;
1493 Elf_Internal_Vernaux
*a
;
1495 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1497 if (a
->vna_other
== vernum
)
1499 verstr
= a
->vna_nodename
;
1508 (*_bfd_error_handler
)
1509 (_("%s: %s: invalid needed version %d"),
1510 bfd_get_filename (abfd
), name
, vernum
);
1511 bfd_set_error (bfd_error_bad_value
);
1516 namelen
= strlen (name
);
1517 newlen
= namelen
+ strlen (verstr
) + 2;
1518 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1521 newname
= (char *) bfd_alloc (abfd
, newlen
);
1522 if (newname
== NULL
)
1524 strcpy (newname
, name
);
1525 p
= newname
+ namelen
;
1527 /* If this is a defined non-hidden version symbol,
1528 we add another @ to the name. This indicates the
1529 default version of the symbol. */
1530 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1531 && sym
.st_shndx
!= SHN_UNDEF
)
1539 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1540 sym_hash
, &override
, &type_change_ok
,
1541 &size_change_ok
, dt_needed
))
1548 while (h
->root
.type
== bfd_link_hash_indirect
1549 || h
->root
.type
== bfd_link_hash_warning
)
1550 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1552 /* Remember the old alignment if this is a common symbol, so
1553 that we don't reduce the alignment later on. We can't
1554 check later, because _bfd_generic_link_add_one_symbol
1555 will set a default for the alignment which we want to
1557 if (h
->root
.type
== bfd_link_hash_common
)
1558 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1560 if (elf_tdata (abfd
)->verdef
!= NULL
1564 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1567 if (! (_bfd_generic_link_add_one_symbol
1568 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1569 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1573 while (h
->root
.type
== bfd_link_hash_indirect
1574 || h
->root
.type
== bfd_link_hash_warning
)
1575 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1578 new_weakdef
= false;
1581 && (flags
& BSF_WEAK
) != 0
1582 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1583 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1584 && h
->weakdef
== NULL
)
1586 /* Keep a list of all weak defined non function symbols from
1587 a dynamic object, using the weakdef field. Later in this
1588 function we will set the weakdef field to the correct
1589 value. We only put non-function symbols from dynamic
1590 objects on this list, because that happens to be the only
1591 time we need to know the normal symbol corresponding to a
1592 weak symbol, and the information is time consuming to
1593 figure out. If the weakdef field is not already NULL,
1594 then this symbol was already defined by some previous
1595 dynamic object, and we will be using that previous
1596 definition anyhow. */
1603 /* Set the alignment of a common symbol. */
1604 if (sym
.st_shndx
== SHN_COMMON
1605 && h
->root
.type
== bfd_link_hash_common
)
1609 align
= bfd_log2 (sym
.st_value
);
1610 if (align
> old_alignment
1611 /* Permit an alignment power of zero if an alignment of one
1612 is specified and no other alignments have been specified. */
1613 || (sym
.st_value
== 1 && old_alignment
== 0))
1614 h
->root
.u
.c
.p
->alignment_power
= align
;
1617 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1623 /* Remember the symbol size and type. */
1624 if (sym
.st_size
!= 0
1625 && (definition
|| h
->size
== 0))
1627 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1628 (*_bfd_error_handler
)
1629 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1630 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1631 bfd_get_filename (abfd
));
1633 h
->size
= sym
.st_size
;
1636 /* If this is a common symbol, then we always want H->SIZE
1637 to be the size of the common symbol. The code just above
1638 won't fix the size if a common symbol becomes larger. We
1639 don't warn about a size change here, because that is
1640 covered by --warn-common. */
1641 if (h
->root
.type
== bfd_link_hash_common
)
1642 h
->size
= h
->root
.u
.c
.size
;
1644 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1645 && (definition
|| h
->type
== STT_NOTYPE
))
1647 if (h
->type
!= STT_NOTYPE
1648 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1649 && ! type_change_ok
)
1650 (*_bfd_error_handler
)
1651 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1652 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1653 bfd_get_filename (abfd
));
1655 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1658 /* If st_other has a processor-specific meaning, specific code
1659 might be needed here. */
1660 if (sym
.st_other
!= 0)
1662 /* Combine visibilities, using the most constraining one. */
1663 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1664 unsigned char symvis
= ELF_ST_VISIBILITY (sym
.st_other
);
1666 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1667 h
->other
= sym
.st_other
;
1669 /* If neither has visibility, use the st_other of the
1670 definition. This is an arbitrary choice, since the
1671 other bits have no general meaning. */
1672 if (!symvis
&& !hvis
1673 && (definition
|| h
->other
== 0))
1674 h
->other
= sym
.st_other
;
1677 /* Set a flag in the hash table entry indicating the type of
1678 reference or definition we just found. Keep a count of
1679 the number of dynamic symbols we find. A dynamic symbol
1680 is one which is referenced or defined by both a regular
1681 object and a shared object. */
1682 old_flags
= h
->elf_link_hash_flags
;
1688 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1689 if (bind
!= STB_WEAK
)
1690 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1693 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1695 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1696 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1702 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1704 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1705 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1706 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1707 || (h
->weakdef
!= NULL
1709 && h
->weakdef
->dynindx
!= -1))
1713 h
->elf_link_hash_flags
|= new_flag
;
1715 /* If this symbol has a version, and it is the default
1716 version, we create an indirect symbol from the default
1717 name to the fully decorated name. This will cause
1718 external references which do not specify a version to be
1719 bound to this version of the symbol. */
1724 p
= strchr (name
, ELF_VER_CHR
);
1725 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1728 struct elf_link_hash_entry
*hi
;
1731 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1733 if (shortname
== NULL
)
1735 strncpy (shortname
, name
, p
- name
);
1736 shortname
[p
- name
] = '\0';
1738 /* We are going to create a new symbol. Merge it
1739 with any existing symbol with this name. For the
1740 purposes of the merge, act as though we were
1741 defining the symbol we just defined, although we
1742 actually going to define an indirect symbol. */
1743 type_change_ok
= false;
1744 size_change_ok
= false;
1745 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1746 &value
, &hi
, &override
,
1748 &size_change_ok
, dt_needed
))
1753 if (! (_bfd_generic_link_add_one_symbol
1754 (info
, abfd
, shortname
, BSF_INDIRECT
,
1755 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1756 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1761 /* In this case the symbol named SHORTNAME is
1762 overriding the indirect symbol we want to
1763 add. We were planning on making SHORTNAME an
1764 indirect symbol referring to NAME. SHORTNAME
1765 is the name without a version. NAME is the
1766 fully versioned name, and it is the default
1769 Overriding means that we already saw a
1770 definition for the symbol SHORTNAME in a
1771 regular object, and it is overriding the
1772 symbol defined in the dynamic object.
1774 When this happens, we actually want to change
1775 NAME, the symbol we just added, to refer to
1776 SHORTNAME. This will cause references to
1777 NAME in the shared object to become
1778 references to SHORTNAME in the regular
1779 object. This is what we expect when we
1780 override a function in a shared object: that
1781 the references in the shared object will be
1782 mapped to the definition in the regular
1785 while (hi
->root
.type
== bfd_link_hash_indirect
1786 || hi
->root
.type
== bfd_link_hash_warning
)
1787 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1789 h
->root
.type
= bfd_link_hash_indirect
;
1790 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1791 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1793 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1794 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1795 if (hi
->elf_link_hash_flags
1796 & (ELF_LINK_HASH_REF_REGULAR
1797 | ELF_LINK_HASH_DEF_REGULAR
))
1799 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1805 /* Now set HI to H, so that the following code
1806 will set the other fields correctly. */
1810 /* If there is a duplicate definition somewhere,
1811 then HI may not point to an indirect symbol. We
1812 will have reported an error to the user in that
1815 if (hi
->root
.type
== bfd_link_hash_indirect
)
1817 struct elf_link_hash_entry
*ht
;
1819 /* If the symbol became indirect, then we assume
1820 that we have not seen a definition before. */
1821 BFD_ASSERT ((hi
->elf_link_hash_flags
1822 & (ELF_LINK_HASH_DEF_DYNAMIC
1823 | ELF_LINK_HASH_DEF_REGULAR
))
1826 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1827 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1829 /* See if the new flags lead us to realize that
1830 the symbol must be dynamic. */
1836 || ((hi
->elf_link_hash_flags
1837 & ELF_LINK_HASH_REF_DYNAMIC
)
1843 if ((hi
->elf_link_hash_flags
1844 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1850 /* We also need to define an indirection from the
1851 nondefault version of the symbol. */
1853 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1855 if (shortname
== NULL
)
1857 strncpy (shortname
, name
, p
- name
);
1858 strcpy (shortname
+ (p
- name
), p
+ 1);
1860 /* Once again, merge with any existing symbol. */
1861 type_change_ok
= false;
1862 size_change_ok
= false;
1863 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1864 &value
, &hi
, &override
,
1866 &size_change_ok
, dt_needed
))
1871 /* Here SHORTNAME is a versioned name, so we
1872 don't expect to see the type of override we
1873 do in the case above. */
1874 (*_bfd_error_handler
)
1875 (_("%s: warning: unexpected redefinition of `%s'"),
1876 bfd_get_filename (abfd
), shortname
);
1880 if (! (_bfd_generic_link_add_one_symbol
1881 (info
, abfd
, shortname
, BSF_INDIRECT
,
1882 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1883 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1886 /* If there is a duplicate definition somewhere,
1887 then HI may not point to an indirect symbol.
1888 We will have reported an error to the user in
1891 if (hi
->root
.type
== bfd_link_hash_indirect
)
1893 /* If the symbol became indirect, then we
1894 assume that we have not seen a definition
1896 BFD_ASSERT ((hi
->elf_link_hash_flags
1897 & (ELF_LINK_HASH_DEF_DYNAMIC
1898 | ELF_LINK_HASH_DEF_REGULAR
))
1901 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1903 /* See if the new flags lead us to realize
1904 that the symbol must be dynamic. */
1910 || ((hi
->elf_link_hash_flags
1911 & ELF_LINK_HASH_REF_DYNAMIC
)
1917 if ((hi
->elf_link_hash_flags
1918 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1927 if (dynsym
&& h
->dynindx
== -1)
1929 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1931 if (h
->weakdef
!= NULL
1933 && h
->weakdef
->dynindx
== -1)
1935 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1940 else if (dynsym
&& h
->dynindx
!= -1)
1941 /* If the symbol already has a dynamic index, but
1942 visibility says it should not be visible, turn it into
1944 switch (ELF_ST_VISIBILITY (h
->other
))
1948 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
1949 (*bed
->elf_backend_hide_symbol
) (info
, h
);
1953 if (dt_needed
&& definition
1954 && (h
->elf_link_hash_flags
1955 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1957 bfd_size_type oldsize
;
1958 bfd_size_type strindex
;
1960 /* The symbol from a DT_NEEDED object is referenced from
1961 the regular object to create a dynamic executable. We
1962 have to make sure there is a DT_NEEDED entry for it. */
1965 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1966 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
1967 elf_dt_soname (abfd
),
1969 if (strindex
== (bfd_size_type
) -1)
1973 == _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1976 Elf_External_Dyn
*dyncon
, *dynconend
;
1978 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1980 BFD_ASSERT (sdyn
!= NULL
);
1982 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1983 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1985 for (; dyncon
< dynconend
; dyncon
++)
1987 Elf_Internal_Dyn dyn
;
1989 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
,
1991 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
1992 dyn
.d_un
.d_val
!= strindex
);
1996 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
2002 /* Now set the weakdefs field correctly for all the weak defined
2003 symbols we found. The only way to do this is to search all the
2004 symbols. Since we only need the information for non functions in
2005 dynamic objects, that's the only time we actually put anything on
2006 the list WEAKS. We need this information so that if a regular
2007 object refers to a symbol defined weakly in a dynamic object, the
2008 real symbol in the dynamic object is also put in the dynamic
2009 symbols; we also must arrange for both symbols to point to the
2010 same memory location. We could handle the general case of symbol
2011 aliasing, but a general symbol alias can only be generated in
2012 assembler code, handling it correctly would be very time
2013 consuming, and other ELF linkers don't handle general aliasing
2015 while (weaks
!= NULL
)
2017 struct elf_link_hash_entry
*hlook
;
2020 struct elf_link_hash_entry
**hpp
;
2021 struct elf_link_hash_entry
**hppend
;
2024 weaks
= hlook
->weakdef
;
2025 hlook
->weakdef
= NULL
;
2027 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
2028 || hlook
->root
.type
== bfd_link_hash_defweak
2029 || hlook
->root
.type
== bfd_link_hash_common
2030 || hlook
->root
.type
== bfd_link_hash_indirect
);
2031 slook
= hlook
->root
.u
.def
.section
;
2032 vlook
= hlook
->root
.u
.def
.value
;
2034 hpp
= elf_sym_hashes (abfd
);
2035 hppend
= hpp
+ extsymcount
;
2036 for (; hpp
< hppend
; hpp
++)
2038 struct elf_link_hash_entry
*h
;
2041 if (h
!= NULL
&& h
!= hlook
2042 && h
->root
.type
== bfd_link_hash_defined
2043 && h
->root
.u
.def
.section
== slook
2044 && h
->root
.u
.def
.value
== vlook
)
2048 /* If the weak definition is in the list of dynamic
2049 symbols, make sure the real definition is put there
2051 if (hlook
->dynindx
!= -1
2052 && h
->dynindx
== -1)
2054 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2058 /* If the real definition is in the list of dynamic
2059 symbols, make sure the weak definition is put there
2060 as well. If we don't do this, then the dynamic
2061 loader might not merge the entries for the real
2062 definition and the weak definition. */
2063 if (h
->dynindx
!= -1
2064 && hlook
->dynindx
== -1)
2066 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2081 if (extversym
!= NULL
)
2087 /* If this object is the same format as the output object, and it is
2088 not a shared library, then let the backend look through the
2091 This is required to build global offset table entries and to
2092 arrange for dynamic relocs. It is not required for the
2093 particular common case of linking non PIC code, even when linking
2094 against shared libraries, but unfortunately there is no way of
2095 knowing whether an object file has been compiled PIC or not.
2096 Looking through the relocs is not particularly time consuming.
2097 The problem is that we must either (1) keep the relocs in memory,
2098 which causes the linker to require additional runtime memory or
2099 (2) read the relocs twice from the input file, which wastes time.
2100 This would be a good case for using mmap.
2102 I have no idea how to handle linking PIC code into a file of a
2103 different format. It probably can't be done. */
2104 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2106 && abfd
->xvec
== info
->hash
->creator
2107 && check_relocs
!= NULL
)
2111 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2113 Elf_Internal_Rela
*internal_relocs
;
2116 if ((o
->flags
& SEC_RELOC
) == 0
2117 || o
->reloc_count
== 0
2118 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2119 && (o
->flags
& SEC_DEBUGGING
) != 0)
2120 || bfd_is_abs_section (o
->output_section
))
2123 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2124 (abfd
, o
, (PTR
) NULL
,
2125 (Elf_Internal_Rela
*) NULL
,
2126 info
->keep_memory
));
2127 if (internal_relocs
== NULL
)
2130 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2132 if (! info
->keep_memory
)
2133 free (internal_relocs
);
2140 /* If this is a non-traditional, non-relocateable link, try to
2141 optimize the handling of the .stab/.stabstr sections. */
2143 && ! info
->relocateable
2144 && ! info
->traditional_format
2145 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2146 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2148 asection
*stab
, *stabstr
;
2150 stab
= bfd_get_section_by_name (abfd
, ".stab");
2153 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2155 if (stabstr
!= NULL
)
2157 struct bfd_elf_section_data
*secdata
;
2159 secdata
= elf_section_data (stab
);
2160 if (! _bfd_link_section_stabs (abfd
,
2161 &elf_hash_table (info
)->stab_info
,
2163 &secdata
->stab_info
))
2178 if (extversym
!= NULL
)
2183 /* Create some sections which will be filled in with dynamic linking
2184 information. ABFD is an input file which requires dynamic sections
2185 to be created. The dynamic sections take up virtual memory space
2186 when the final executable is run, so we need to create them before
2187 addresses are assigned to the output sections. We work out the
2188 actual contents and size of these sections later. */
2191 elf_link_create_dynamic_sections (abfd
, info
)
2193 struct bfd_link_info
*info
;
2196 register asection
*s
;
2197 struct elf_link_hash_entry
*h
;
2198 struct elf_backend_data
*bed
;
2200 if (elf_hash_table (info
)->dynamic_sections_created
)
2203 /* Make sure that all dynamic sections use the same input BFD. */
2204 if (elf_hash_table (info
)->dynobj
== NULL
)
2205 elf_hash_table (info
)->dynobj
= abfd
;
2207 abfd
= elf_hash_table (info
)->dynobj
;
2209 /* Note that we set the SEC_IN_MEMORY flag for all of these
2211 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2212 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2214 /* A dynamically linked executable has a .interp section, but a
2215 shared library does not. */
2218 s
= bfd_make_section (abfd
, ".interp");
2220 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2224 /* Create sections to hold version informations. These are removed
2225 if they are not needed. */
2226 s
= bfd_make_section (abfd
, ".gnu.version_d");
2228 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2229 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2232 s
= bfd_make_section (abfd
, ".gnu.version");
2234 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2235 || ! bfd_set_section_alignment (abfd
, s
, 1))
2238 s
= bfd_make_section (abfd
, ".gnu.version_r");
2240 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2241 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2244 s
= bfd_make_section (abfd
, ".dynsym");
2246 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2247 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2250 s
= bfd_make_section (abfd
, ".dynstr");
2252 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2255 /* Create a strtab to hold the dynamic symbol names. */
2256 if (elf_hash_table (info
)->dynstr
== NULL
)
2258 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
2259 if (elf_hash_table (info
)->dynstr
== NULL
)
2263 s
= bfd_make_section (abfd
, ".dynamic");
2265 || ! bfd_set_section_flags (abfd
, s
, flags
)
2266 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2269 /* The special symbol _DYNAMIC is always set to the start of the
2270 .dynamic section. This call occurs before we have processed the
2271 symbols for any dynamic object, so we don't have to worry about
2272 overriding a dynamic definition. We could set _DYNAMIC in a
2273 linker script, but we only want to define it if we are, in fact,
2274 creating a .dynamic section. We don't want to define it if there
2275 is no .dynamic section, since on some ELF platforms the start up
2276 code examines it to decide how to initialize the process. */
2278 if (! (_bfd_generic_link_add_one_symbol
2279 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2280 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2281 (struct bfd_link_hash_entry
**) &h
)))
2283 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2284 h
->type
= STT_OBJECT
;
2287 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2290 bed
= get_elf_backend_data (abfd
);
2292 s
= bfd_make_section (abfd
, ".hash");
2294 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2295 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2297 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2299 /* Let the backend create the rest of the sections. This lets the
2300 backend set the right flags. The backend will normally create
2301 the .got and .plt sections. */
2302 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2305 elf_hash_table (info
)->dynamic_sections_created
= true;
2310 /* Add an entry to the .dynamic table. */
2313 elf_add_dynamic_entry (info
, tag
, val
)
2314 struct bfd_link_info
*info
;
2318 Elf_Internal_Dyn dyn
;
2322 bfd_byte
*newcontents
;
2324 dynobj
= elf_hash_table (info
)->dynobj
;
2326 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2327 BFD_ASSERT (s
!= NULL
);
2329 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2330 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2331 if (newcontents
== NULL
)
2335 dyn
.d_un
.d_val
= val
;
2336 elf_swap_dyn_out (dynobj
, &dyn
,
2337 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2339 s
->_raw_size
= newsize
;
2340 s
->contents
= newcontents
;
2345 /* Record a new local dynamic symbol. */
2348 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2349 struct bfd_link_info
*info
;
2353 struct elf_link_local_dynamic_entry
*entry
;
2354 struct elf_link_hash_table
*eht
;
2355 struct bfd_strtab_hash
*dynstr
;
2356 Elf_External_Sym esym
;
2357 unsigned long dynstr_index
;
2360 /* See if the entry exists already. */
2361 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2362 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2365 entry
= (struct elf_link_local_dynamic_entry
*)
2366 bfd_alloc (input_bfd
, sizeof (*entry
));
2370 /* Go find the symbol, so that we can find it's name. */
2371 if (bfd_seek (input_bfd
,
2372 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2373 + input_indx
* sizeof (Elf_External_Sym
)),
2375 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2376 != sizeof (Elf_External_Sym
)))
2378 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2380 name
= (bfd_elf_string_from_elf_section
2381 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2382 entry
->isym
.st_name
));
2384 dynstr
= elf_hash_table (info
)->dynstr
;
2387 /* Create a strtab to hold the dynamic symbol names. */
2388 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2393 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2394 if (dynstr_index
== (unsigned long) -1)
2396 entry
->isym
.st_name
= dynstr_index
;
2398 eht
= elf_hash_table (info
);
2400 entry
->next
= eht
->dynlocal
;
2401 eht
->dynlocal
= entry
;
2402 entry
->input_bfd
= input_bfd
;
2403 entry
->input_indx
= input_indx
;
2406 /* Whatever binding the symbol had before, it's now local. */
2408 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2410 /* The dynindx will be set at the end of size_dynamic_sections. */
2416 /* Read and swap the relocs from the section indicated by SHDR. This
2417 may be either a REL or a RELA section. The relocations are
2418 translated into RELA relocations and stored in INTERNAL_RELOCS,
2419 which should have already been allocated to contain enough space.
2420 The EXTERNAL_RELOCS are a buffer where the external form of the
2421 relocations should be stored.
2423 Returns false if something goes wrong. */
2426 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2429 Elf_Internal_Shdr
*shdr
;
2430 PTR external_relocs
;
2431 Elf_Internal_Rela
*internal_relocs
;
2433 struct elf_backend_data
*bed
;
2435 /* If there aren't any relocations, that's OK. */
2439 /* Position ourselves at the start of the section. */
2440 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2443 /* Read the relocations. */
2444 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2448 bed
= get_elf_backend_data (abfd
);
2450 /* Convert the external relocations to the internal format. */
2451 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2453 Elf_External_Rel
*erel
;
2454 Elf_External_Rel
*erelend
;
2455 Elf_Internal_Rela
*irela
;
2456 Elf_Internal_Rel
*irel
;
2458 erel
= (Elf_External_Rel
*) external_relocs
;
2459 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2460 irela
= internal_relocs
;
2461 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2462 * sizeof (Elf_Internal_Rel
)));
2463 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2467 if (bed
->s
->swap_reloc_in
)
2468 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2470 elf_swap_reloc_in (abfd
, erel
, irel
);
2472 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2474 irela
[i
].r_offset
= irel
[i
].r_offset
;
2475 irela
[i
].r_info
= irel
[i
].r_info
;
2476 irela
[i
].r_addend
= 0;
2482 Elf_External_Rela
*erela
;
2483 Elf_External_Rela
*erelaend
;
2484 Elf_Internal_Rela
*irela
;
2486 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2488 erela
= (Elf_External_Rela
*) external_relocs
;
2489 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2490 irela
= internal_relocs
;
2491 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2493 if (bed
->s
->swap_reloca_in
)
2494 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2496 elf_swap_reloca_in (abfd
, erela
, irela
);
2503 /* Read and swap the relocs for a section O. They may have been
2504 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2505 not NULL, they are used as buffers to read into. They are known to
2506 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2507 the return value is allocated using either malloc or bfd_alloc,
2508 according to the KEEP_MEMORY argument. If O has two relocation
2509 sections (both REL and RELA relocations), then the REL_HDR
2510 relocations will appear first in INTERNAL_RELOCS, followed by the
2511 REL_HDR2 relocations. */
2514 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2518 PTR external_relocs
;
2519 Elf_Internal_Rela
*internal_relocs
;
2520 boolean keep_memory
;
2522 Elf_Internal_Shdr
*rel_hdr
;
2524 Elf_Internal_Rela
*alloc2
= NULL
;
2525 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2527 if (elf_section_data (o
)->relocs
!= NULL
)
2528 return elf_section_data (o
)->relocs
;
2530 if (o
->reloc_count
== 0)
2533 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2535 if (internal_relocs
== NULL
)
2539 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2540 * sizeof (Elf_Internal_Rela
));
2542 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2544 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2545 if (internal_relocs
== NULL
)
2549 if (external_relocs
== NULL
)
2551 size_t size
= (size_t) rel_hdr
->sh_size
;
2553 if (elf_section_data (o
)->rel_hdr2
)
2554 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2555 alloc1
= (PTR
) bfd_malloc (size
);
2558 external_relocs
= alloc1
;
2561 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2565 if (!elf_link_read_relocs_from_section
2567 elf_section_data (o
)->rel_hdr2
,
2568 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2569 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2570 * bed
->s
->int_rels_per_ext_rel
)))
2573 /* Cache the results for next time, if we can. */
2575 elf_section_data (o
)->relocs
= internal_relocs
;
2580 /* Don't free alloc2, since if it was allocated we are passing it
2581 back (under the name of internal_relocs). */
2583 return internal_relocs
;
2594 /* Record an assignment to a symbol made by a linker script. We need
2595 this in case some dynamic object refers to this symbol. */
2599 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2600 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2601 struct bfd_link_info
*info
;
2605 struct elf_link_hash_entry
*h
;
2607 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2610 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2614 if (h
->root
.type
== bfd_link_hash_new
)
2615 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2617 /* If this symbol is being provided by the linker script, and it is
2618 currently defined by a dynamic object, but not by a regular
2619 object, then mark it as undefined so that the generic linker will
2620 force the correct value. */
2622 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2623 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2624 h
->root
.type
= bfd_link_hash_undefined
;
2626 /* If this symbol is not being provided by the linker script, and it is
2627 currently defined by a dynamic object, but not by a regular object,
2628 then clear out any version information because the symbol will not be
2629 associated with the dynamic object any more. */
2631 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2632 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2633 h
->verinfo
.verdef
= NULL
;
2635 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2637 /* When possible, keep the original type of the symbol */
2638 if (h
->type
== STT_NOTYPE
)
2639 h
->type
= STT_OBJECT
;
2641 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2642 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2644 && h
->dynindx
== -1)
2646 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2649 /* If this is a weak defined symbol, and we know a corresponding
2650 real symbol from the same dynamic object, make sure the real
2651 symbol is also made into a dynamic symbol. */
2652 if (h
->weakdef
!= NULL
2653 && h
->weakdef
->dynindx
== -1)
2655 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2663 /* This structure is used to pass information to
2664 elf_link_assign_sym_version. */
2666 struct elf_assign_sym_version_info
2670 /* General link information. */
2671 struct bfd_link_info
*info
;
2673 struct bfd_elf_version_tree
*verdefs
;
2674 /* Whether we are exporting all dynamic symbols. */
2675 boolean export_dynamic
;
2676 /* Whether we had a failure. */
2680 /* This structure is used to pass information to
2681 elf_link_find_version_dependencies. */
2683 struct elf_find_verdep_info
2687 /* General link information. */
2688 struct bfd_link_info
*info
;
2689 /* The number of dependencies. */
2691 /* Whether we had a failure. */
2695 /* Array used to determine the number of hash table buckets to use
2696 based on the number of symbols there are. If there are fewer than
2697 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2698 fewer than 37 we use 17 buckets, and so forth. We never use more
2699 than 32771 buckets. */
2701 static const size_t elf_buckets
[] =
2703 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2707 /* Compute bucket count for hashing table. We do not use a static set
2708 of possible tables sizes anymore. Instead we determine for all
2709 possible reasonable sizes of the table the outcome (i.e., the
2710 number of collisions etc) and choose the best solution. The
2711 weighting functions are not too simple to allow the table to grow
2712 without bounds. Instead one of the weighting factors is the size.
2713 Therefore the result is always a good payoff between few collisions
2714 (= short chain lengths) and table size. */
2716 compute_bucket_count (info
)
2717 struct bfd_link_info
*info
;
2719 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2720 size_t best_size
= 0;
2721 unsigned long int *hashcodes
;
2722 unsigned long int *hashcodesp
;
2723 unsigned long int i
;
2725 /* Compute the hash values for all exported symbols. At the same
2726 time store the values in an array so that we could use them for
2728 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2729 * sizeof (unsigned long int));
2730 if (hashcodes
== NULL
)
2732 hashcodesp
= hashcodes
;
2734 /* Put all hash values in HASHCODES. */
2735 elf_link_hash_traverse (elf_hash_table (info
),
2736 elf_collect_hash_codes
, &hashcodesp
);
2738 /* We have a problem here. The following code to optimize the table
2739 size requires an integer type with more the 32 bits. If
2740 BFD_HOST_U_64_BIT is set we know about such a type. */
2741 #ifdef BFD_HOST_U_64_BIT
2742 if (info
->optimize
== true)
2744 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2747 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2748 unsigned long int *counts
;
2750 /* Possible optimization parameters: if we have NSYMS symbols we say
2751 that the hashing table must at least have NSYMS/4 and at most
2753 minsize
= nsyms
/ 4;
2756 best_size
= maxsize
= nsyms
* 2;
2758 /* Create array where we count the collisions in. We must use bfd_malloc
2759 since the size could be large. */
2760 counts
= (unsigned long int *) bfd_malloc (maxsize
2761 * sizeof (unsigned long int));
2768 /* Compute the "optimal" size for the hash table. The criteria is a
2769 minimal chain length. The minor criteria is (of course) the size
2771 for (i
= minsize
; i
< maxsize
; ++i
)
2773 /* Walk through the array of hashcodes and count the collisions. */
2774 BFD_HOST_U_64_BIT max
;
2775 unsigned long int j
;
2776 unsigned long int fact
;
2778 memset (counts
, '\0', i
* sizeof (unsigned long int));
2780 /* Determine how often each hash bucket is used. */
2781 for (j
= 0; j
< nsyms
; ++j
)
2782 ++counts
[hashcodes
[j
] % i
];
2784 /* For the weight function we need some information about the
2785 pagesize on the target. This is information need not be 100%
2786 accurate. Since this information is not available (so far) we
2787 define it here to a reasonable default value. If it is crucial
2788 to have a better value some day simply define this value. */
2789 # ifndef BFD_TARGET_PAGESIZE
2790 # define BFD_TARGET_PAGESIZE (4096)
2793 /* We in any case need 2 + NSYMS entries for the size values and
2795 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2798 /* Variant 1: optimize for short chains. We add the squares
2799 of all the chain lengths (which favous many small chain
2800 over a few long chains). */
2801 for (j
= 0; j
< i
; ++j
)
2802 max
+= counts
[j
] * counts
[j
];
2804 /* This adds penalties for the overall size of the table. */
2805 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2808 /* Variant 2: Optimize a lot more for small table. Here we
2809 also add squares of the size but we also add penalties for
2810 empty slots (the +1 term). */
2811 for (j
= 0; j
< i
; ++j
)
2812 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2814 /* The overall size of the table is considered, but not as
2815 strong as in variant 1, where it is squared. */
2816 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2820 /* Compare with current best results. */
2821 if (max
< best_chlen
)
2831 #endif /* defined (BFD_HOST_U_64_BIT) */
2833 /* This is the fallback solution if no 64bit type is available or if we
2834 are not supposed to spend much time on optimizations. We select the
2835 bucket count using a fixed set of numbers. */
2836 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2838 best_size
= elf_buckets
[i
];
2839 if (dynsymcount
< elf_buckets
[i
+ 1])
2844 /* Free the arrays we needed. */
2850 /* Set up the sizes and contents of the ELF dynamic sections. This is
2851 called by the ELF linker emulation before_allocation routine. We
2852 must set the sizes of the sections before the linker sets the
2853 addresses of the various sections. */
2856 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2857 export_dynamic
, filter_shlib
,
2858 auxiliary_filters
, info
, sinterpptr
,
2863 boolean export_dynamic
;
2864 const char *filter_shlib
;
2865 const char * const *auxiliary_filters
;
2866 struct bfd_link_info
*info
;
2867 asection
**sinterpptr
;
2868 struct bfd_elf_version_tree
*verdefs
;
2870 bfd_size_type soname_indx
;
2872 struct elf_backend_data
*bed
;
2873 struct elf_assign_sym_version_info asvinfo
;
2877 soname_indx
= (bfd_size_type
) -1;
2879 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2882 /* The backend may have to create some sections regardless of whether
2883 we're dynamic or not. */
2884 bed
= get_elf_backend_data (output_bfd
);
2885 if (bed
->elf_backend_always_size_sections
2886 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2889 dynobj
= elf_hash_table (info
)->dynobj
;
2891 /* If there were no dynamic objects in the link, there is nothing to
2896 if (elf_hash_table (info
)->dynamic_sections_created
)
2898 struct elf_info_failed eif
;
2899 struct elf_link_hash_entry
*h
;
2900 bfd_size_type strsize
;
2902 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2903 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2907 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2908 soname
, true, true);
2909 if (soname_indx
== (bfd_size_type
) -1
2910 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2916 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2918 info
->flags
|= DF_SYMBOLIC
;
2925 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2927 if (indx
== (bfd_size_type
) -1
2928 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
)
2930 && ! elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
)))
2934 if (filter_shlib
!= NULL
)
2938 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2939 filter_shlib
, true, true);
2940 if (indx
== (bfd_size_type
) -1
2941 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2945 if (auxiliary_filters
!= NULL
)
2947 const char * const *p
;
2949 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2953 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2955 if (indx
== (bfd_size_type
) -1
2956 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2961 /* If we are supposed to export all symbols into the dynamic symbol
2962 table (this is not the normal case), then do so. */
2965 struct elf_info_failed eif
;
2969 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2975 /* Attach all the symbols to their version information. */
2976 asvinfo
.output_bfd
= output_bfd
;
2977 asvinfo
.info
= info
;
2978 asvinfo
.verdefs
= verdefs
;
2979 asvinfo
.export_dynamic
= export_dynamic
;
2980 asvinfo
.failed
= false;
2982 elf_link_hash_traverse (elf_hash_table (info
),
2983 elf_link_assign_sym_version
,
2988 /* Find all symbols which were defined in a dynamic object and make
2989 the backend pick a reasonable value for them. */
2992 elf_link_hash_traverse (elf_hash_table (info
),
2993 elf_adjust_dynamic_symbol
,
2998 /* Add some entries to the .dynamic section. We fill in some of the
2999 values later, in elf_bfd_final_link, but we must add the entries
3000 now so that we know the final size of the .dynamic section. */
3002 /* If there are initialization and/or finalization functions to
3003 call then add the corresponding DT_INIT/DT_FINI entries. */
3004 h
= (info
->init_function
3005 ? elf_link_hash_lookup (elf_hash_table (info
),
3006 info
->init_function
, false,
3010 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3011 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3013 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
3016 h
= (info
->fini_function
3017 ? elf_link_hash_lookup (elf_hash_table (info
),
3018 info
->fini_function
, false,
3022 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3023 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3025 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
3029 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3030 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
3031 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
3032 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
3033 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
3034 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
3035 sizeof (Elf_External_Sym
)))
3039 /* The backend must work out the sizes of all the other dynamic
3041 if (bed
->elf_backend_size_dynamic_sections
3042 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3045 if (elf_hash_table (info
)->dynamic_sections_created
)
3049 size_t bucketcount
= 0;
3050 Elf_Internal_Sym isym
;
3051 size_t hash_entry_size
;
3053 /* Set up the version definition section. */
3054 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3055 BFD_ASSERT (s
!= NULL
);
3057 /* We may have created additional version definitions if we are
3058 just linking a regular application. */
3059 verdefs
= asvinfo
.verdefs
;
3061 if (verdefs
== NULL
)
3062 _bfd_strip_section_from_output (info
, s
);
3067 struct bfd_elf_version_tree
*t
;
3069 Elf_Internal_Verdef def
;
3070 Elf_Internal_Verdaux defaux
;
3075 /* Make space for the base version. */
3076 size
+= sizeof (Elf_External_Verdef
);
3077 size
+= sizeof (Elf_External_Verdaux
);
3080 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3082 struct bfd_elf_version_deps
*n
;
3084 size
+= sizeof (Elf_External_Verdef
);
3085 size
+= sizeof (Elf_External_Verdaux
);
3088 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3089 size
+= sizeof (Elf_External_Verdaux
);
3092 s
->_raw_size
= size
;
3093 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3094 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3097 /* Fill in the version definition section. */
3101 def
.vd_version
= VER_DEF_CURRENT
;
3102 def
.vd_flags
= VER_FLG_BASE
;
3105 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3106 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3107 + sizeof (Elf_External_Verdaux
));
3109 if (soname_indx
!= (bfd_size_type
) -1)
3111 def
.vd_hash
= bfd_elf_hash (soname
);
3112 defaux
.vda_name
= soname_indx
;
3119 name
= output_bfd
->filename
;
3120 def
.vd_hash
= bfd_elf_hash (name
);
3121 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3123 if (indx
== (bfd_size_type
) -1)
3125 defaux
.vda_name
= indx
;
3127 defaux
.vda_next
= 0;
3129 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3130 (Elf_External_Verdef
*)p
);
3131 p
+= sizeof (Elf_External_Verdef
);
3132 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3133 (Elf_External_Verdaux
*) p
);
3134 p
+= sizeof (Elf_External_Verdaux
);
3136 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3139 struct bfd_elf_version_deps
*n
;
3140 struct elf_link_hash_entry
*h
;
3143 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3146 /* Add a symbol representing this version. */
3148 if (! (_bfd_generic_link_add_one_symbol
3149 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3150 (bfd_vma
) 0, (const char *) NULL
, false,
3151 get_elf_backend_data (dynobj
)->collect
,
3152 (struct bfd_link_hash_entry
**) &h
)))
3154 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3155 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3156 h
->type
= STT_OBJECT
;
3157 h
->verinfo
.vertree
= t
;
3159 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3162 def
.vd_version
= VER_DEF_CURRENT
;
3164 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3165 def
.vd_flags
|= VER_FLG_WEAK
;
3166 def
.vd_ndx
= t
->vernum
+ 1;
3167 def
.vd_cnt
= cdeps
+ 1;
3168 def
.vd_hash
= bfd_elf_hash (t
->name
);
3169 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3170 if (t
->next
!= NULL
)
3171 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3172 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3176 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3177 (Elf_External_Verdef
*) p
);
3178 p
+= sizeof (Elf_External_Verdef
);
3180 defaux
.vda_name
= h
->dynstr_index
;
3181 if (t
->deps
== NULL
)
3182 defaux
.vda_next
= 0;
3184 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3185 t
->name_indx
= defaux
.vda_name
;
3187 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3188 (Elf_External_Verdaux
*) p
);
3189 p
+= sizeof (Elf_External_Verdaux
);
3191 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3193 if (n
->version_needed
== NULL
)
3195 /* This can happen if there was an error in the
3197 defaux
.vda_name
= 0;
3200 defaux
.vda_name
= n
->version_needed
->name_indx
;
3201 if (n
->next
== NULL
)
3202 defaux
.vda_next
= 0;
3204 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3206 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3207 (Elf_External_Verdaux
*) p
);
3208 p
+= sizeof (Elf_External_Verdaux
);
3212 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
3213 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
3216 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3219 if (info
->new_dtags
&& info
->flags
)
3221 if (! elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
3228 info
->flags_1
&= ~ (DF_1_INITFIRST
3231 if (! elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
3235 /* Work out the size of the version reference section. */
3237 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3238 BFD_ASSERT (s
!= NULL
);
3240 struct elf_find_verdep_info sinfo
;
3242 sinfo
.output_bfd
= output_bfd
;
3244 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3245 if (sinfo
.vers
== 0)
3247 sinfo
.failed
= false;
3249 elf_link_hash_traverse (elf_hash_table (info
),
3250 elf_link_find_version_dependencies
,
3253 if (elf_tdata (output_bfd
)->verref
== NULL
)
3254 _bfd_strip_section_from_output (info
, s
);
3257 Elf_Internal_Verneed
*t
;
3262 /* Build the version definition section. */
3265 for (t
= elf_tdata (output_bfd
)->verref
;
3269 Elf_Internal_Vernaux
*a
;
3271 size
+= sizeof (Elf_External_Verneed
);
3273 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3274 size
+= sizeof (Elf_External_Vernaux
);
3277 s
->_raw_size
= size
;
3278 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
3279 if (s
->contents
== NULL
)
3283 for (t
= elf_tdata (output_bfd
)->verref
;
3288 Elf_Internal_Vernaux
*a
;
3292 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3295 t
->vn_version
= VER_NEED_CURRENT
;
3297 if (elf_dt_name (t
->vn_bfd
) != NULL
)
3298 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3299 elf_dt_name (t
->vn_bfd
),
3302 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3303 t
->vn_bfd
->filename
, true, false);
3304 if (indx
== (bfd_size_type
) -1)
3307 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3308 if (t
->vn_nextref
== NULL
)
3311 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3312 + caux
* sizeof (Elf_External_Vernaux
));
3314 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3315 (Elf_External_Verneed
*) p
);
3316 p
+= sizeof (Elf_External_Verneed
);
3318 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3320 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3321 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3322 a
->vna_nodename
, true, false);
3323 if (indx
== (bfd_size_type
) -1)
3326 if (a
->vna_nextptr
== NULL
)
3329 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3331 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3332 (Elf_External_Vernaux
*) p
);
3333 p
+= sizeof (Elf_External_Vernaux
);
3337 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3338 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3341 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3345 /* Assign dynsym indicies. In a shared library we generate a
3346 section symbol for each output section, which come first.
3347 Next come all of the back-end allocated local dynamic syms,
3348 followed by the rest of the global symbols. */
3350 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3352 /* Work out the size of the symbol version section. */
3353 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3354 BFD_ASSERT (s
!= NULL
);
3355 if (dynsymcount
== 0
3356 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3358 _bfd_strip_section_from_output (info
, s
);
3359 /* The DYNSYMCOUNT might have changed if we were going to
3360 output a dynamic symbol table entry for S. */
3361 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3365 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3366 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3367 if (s
->contents
== NULL
)
3370 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3374 /* Set the size of the .dynsym and .hash sections. We counted
3375 the number of dynamic symbols in elf_link_add_object_symbols.
3376 We will build the contents of .dynsym and .hash when we build
3377 the final symbol table, because until then we do not know the
3378 correct value to give the symbols. We built the .dynstr
3379 section as we went along in elf_link_add_object_symbols. */
3380 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3381 BFD_ASSERT (s
!= NULL
);
3382 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3383 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3384 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3387 /* The first entry in .dynsym is a dummy symbol. */
3394 elf_swap_symbol_out (output_bfd
, &isym
,
3395 (PTR
) (Elf_External_Sym
*) s
->contents
);
3397 /* Compute the size of the hashing table. As a side effect this
3398 computes the hash values for all the names we export. */
3399 bucketcount
= compute_bucket_count (info
);
3401 s
= bfd_get_section_by_name (dynobj
, ".hash");
3402 BFD_ASSERT (s
!= NULL
);
3403 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3404 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3405 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3406 if (s
->contents
== NULL
)
3408 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3410 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3411 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3412 s
->contents
+ hash_entry_size
);
3414 elf_hash_table (info
)->bucketcount
= bucketcount
;
3416 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3417 BFD_ASSERT (s
!= NULL
);
3418 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3420 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3427 /* Fix up the flags for a symbol. This handles various cases which
3428 can only be fixed after all the input files are seen. This is
3429 currently called by both adjust_dynamic_symbol and
3430 assign_sym_version, which is unnecessary but perhaps more robust in
3431 the face of future changes. */
3434 elf_fix_symbol_flags (h
, eif
)
3435 struct elf_link_hash_entry
*h
;
3436 struct elf_info_failed
*eif
;
3438 /* If this symbol was mentioned in a non-ELF file, try to set
3439 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3440 permit a non-ELF file to correctly refer to a symbol defined in
3441 an ELF dynamic object. */
3442 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3444 while (h
->root
.type
== bfd_link_hash_indirect
)
3445 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3447 if (h
->root
.type
!= bfd_link_hash_defined
3448 && h
->root
.type
!= bfd_link_hash_defweak
)
3449 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3450 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3453 if (h
->root
.u
.def
.section
->owner
!= NULL
3454 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3455 == bfd_target_elf_flavour
))
3456 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3457 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3459 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3462 if (h
->dynindx
== -1
3463 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3464 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3466 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3475 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3476 was first seen in a non-ELF file. Fortunately, if the symbol
3477 was first seen in an ELF file, we're probably OK unless the
3478 symbol was defined in a non-ELF file. Catch that case here.
3479 FIXME: We're still in trouble if the symbol was first seen in
3480 a dynamic object, and then later in a non-ELF regular object. */
3481 if ((h
->root
.type
== bfd_link_hash_defined
3482 || h
->root
.type
== bfd_link_hash_defweak
)
3483 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3484 && (h
->root
.u
.def
.section
->owner
!= NULL
3485 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3486 != bfd_target_elf_flavour
)
3487 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3488 && (h
->elf_link_hash_flags
3489 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3490 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3493 /* If this is a final link, and the symbol was defined as a common
3494 symbol in a regular object file, and there was no definition in
3495 any dynamic object, then the linker will have allocated space for
3496 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3497 flag will not have been set. */
3498 if (h
->root
.type
== bfd_link_hash_defined
3499 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3500 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3501 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3502 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3503 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3505 /* If -Bsymbolic was used (which means to bind references to global
3506 symbols to the definition within the shared object), and this
3507 symbol was defined in a regular object, then it actually doesn't
3508 need a PLT entry. Likewise, if the symbol has any kind of
3509 visibility (internal, hidden, or protected), it doesn't need a
3511 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3512 && eif
->info
->shared
3513 && (eif
->info
->symbolic
|| ELF_ST_VISIBILITY (h
->other
))
3514 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3516 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3517 h
->plt
.offset
= (bfd_vma
) -1;
3520 /* If this is a weak defined symbol in a dynamic object, and we know
3521 the real definition in the dynamic object, copy interesting flags
3522 over to the real definition. */
3523 if (h
->weakdef
!= NULL
)
3525 struct elf_link_hash_entry
*weakdef
;
3527 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3528 || h
->root
.type
== bfd_link_hash_defweak
);
3529 weakdef
= h
->weakdef
;
3530 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3531 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3532 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3534 /* If the real definition is defined by a regular object file,
3535 don't do anything special. See the longer description in
3536 elf_adjust_dynamic_symbol, below. */
3537 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3540 weakdef
->elf_link_hash_flags
|=
3541 (h
->elf_link_hash_flags
3542 & (ELF_LINK_HASH_REF_REGULAR
3543 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3544 | ELF_LINK_NON_GOT_REF
));
3550 /* Make the backend pick a good value for a dynamic symbol. This is
3551 called via elf_link_hash_traverse, and also calls itself
3555 elf_adjust_dynamic_symbol (h
, data
)
3556 struct elf_link_hash_entry
*h
;
3559 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3561 struct elf_backend_data
*bed
;
3563 /* Ignore indirect symbols. These are added by the versioning code. */
3564 if (h
->root
.type
== bfd_link_hash_indirect
)
3567 /* Fix the symbol flags. */
3568 if (! elf_fix_symbol_flags (h
, eif
))
3571 /* If this symbol does not require a PLT entry, and it is not
3572 defined by a dynamic object, or is not referenced by a regular
3573 object, ignore it. We do have to handle a weak defined symbol,
3574 even if no regular object refers to it, if we decided to add it
3575 to the dynamic symbol table. FIXME: Do we normally need to worry
3576 about symbols which are defined by one dynamic object and
3577 referenced by another one? */
3578 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3579 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3580 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3581 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3582 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3584 h
->plt
.offset
= (bfd_vma
) -1;
3588 /* If we've already adjusted this symbol, don't do it again. This
3589 can happen via a recursive call. */
3590 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3593 /* Don't look at this symbol again. Note that we must set this
3594 after checking the above conditions, because we may look at a
3595 symbol once, decide not to do anything, and then get called
3596 recursively later after REF_REGULAR is set below. */
3597 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3599 /* If this is a weak definition, and we know a real definition, and
3600 the real symbol is not itself defined by a regular object file,
3601 then get a good value for the real definition. We handle the
3602 real symbol first, for the convenience of the backend routine.
3604 Note that there is a confusing case here. If the real definition
3605 is defined by a regular object file, we don't get the real symbol
3606 from the dynamic object, but we do get the weak symbol. If the
3607 processor backend uses a COPY reloc, then if some routine in the
3608 dynamic object changes the real symbol, we will not see that
3609 change in the corresponding weak symbol. This is the way other
3610 ELF linkers work as well, and seems to be a result of the shared
3613 I will clarify this issue. Most SVR4 shared libraries define the
3614 variable _timezone and define timezone as a weak synonym. The
3615 tzset call changes _timezone. If you write
3616 extern int timezone;
3618 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3619 you might expect that, since timezone is a synonym for _timezone,
3620 the same number will print both times. However, if the processor
3621 backend uses a COPY reloc, then actually timezone will be copied
3622 into your process image, and, since you define _timezone
3623 yourself, _timezone will not. Thus timezone and _timezone will
3624 wind up at different memory locations. The tzset call will set
3625 _timezone, leaving timezone unchanged. */
3627 if (h
->weakdef
!= NULL
)
3629 /* If we get to this point, we know there is an implicit
3630 reference by a regular object file via the weak symbol H.
3631 FIXME: Is this really true? What if the traversal finds
3632 H->WEAKDEF before it finds H? */
3633 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3635 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
3639 /* If a symbol has no type and no size and does not require a PLT
3640 entry, then we are probably about to do the wrong thing here: we
3641 are probably going to create a COPY reloc for an empty object.
3642 This case can arise when a shared object is built with assembly
3643 code, and the assembly code fails to set the symbol type. */
3645 && h
->type
== STT_NOTYPE
3646 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3647 (*_bfd_error_handler
)
3648 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3649 h
->root
.root
.string
);
3651 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3652 bed
= get_elf_backend_data (dynobj
);
3653 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3662 /* This routine is used to export all defined symbols into the dynamic
3663 symbol table. It is called via elf_link_hash_traverse. */
3666 elf_export_symbol (h
, data
)
3667 struct elf_link_hash_entry
*h
;
3670 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3672 /* Ignore indirect symbols. These are added by the versioning code. */
3673 if (h
->root
.type
== bfd_link_hash_indirect
)
3676 if (h
->dynindx
== -1
3677 && (h
->elf_link_hash_flags
3678 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3680 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3690 /* Look through the symbols which are defined in other shared
3691 libraries and referenced here. Update the list of version
3692 dependencies. This will be put into the .gnu.version_r section.
3693 This function is called via elf_link_hash_traverse. */
3696 elf_link_find_version_dependencies (h
, data
)
3697 struct elf_link_hash_entry
*h
;
3700 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3701 Elf_Internal_Verneed
*t
;
3702 Elf_Internal_Vernaux
*a
;
3704 /* We only care about symbols defined in shared objects with version
3706 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3707 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3709 || h
->verinfo
.verdef
== NULL
)
3712 /* See if we already know about this version. */
3713 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3715 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3718 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3719 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3725 /* This is a new version. Add it to tree we are building. */
3729 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3732 rinfo
->failed
= true;
3736 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3737 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3738 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3741 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3743 /* Note that we are copying a string pointer here, and testing it
3744 above. If bfd_elf_string_from_elf_section is ever changed to
3745 discard the string data when low in memory, this will have to be
3747 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3749 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3750 a
->vna_nextptr
= t
->vn_auxptr
;
3752 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3755 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3762 /* Figure out appropriate versions for all the symbols. We may not
3763 have the version number script until we have read all of the input
3764 files, so until that point we don't know which symbols should be
3765 local. This function is called via elf_link_hash_traverse. */
3768 elf_link_assign_sym_version (h
, data
)
3769 struct elf_link_hash_entry
*h
;
3772 struct elf_assign_sym_version_info
*sinfo
=
3773 (struct elf_assign_sym_version_info
*) data
;
3774 struct bfd_link_info
*info
= sinfo
->info
;
3775 struct elf_backend_data
*bed
;
3776 struct elf_info_failed eif
;
3779 /* Fix the symbol flags. */
3782 if (! elf_fix_symbol_flags (h
, &eif
))
3785 sinfo
->failed
= true;
3789 /* We only need version numbers for symbols defined in regular
3791 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3794 bed
= get_elf_backend_data (sinfo
->output_bfd
);
3795 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3796 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3798 struct bfd_elf_version_tree
*t
;
3803 /* There are two consecutive ELF_VER_CHR characters if this is
3804 not a hidden symbol. */
3806 if (*p
== ELF_VER_CHR
)
3812 /* If there is no version string, we can just return out. */
3816 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3820 /* Look for the version. If we find it, it is no longer weak. */
3821 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3823 if (strcmp (t
->name
, p
) == 0)
3827 struct bfd_elf_version_expr
*d
;
3829 len
= p
- h
->root
.root
.string
;
3830 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3833 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3834 alc
[len
- 1] = '\0';
3835 if (alc
[len
- 2] == ELF_VER_CHR
)
3836 alc
[len
- 2] = '\0';
3838 h
->verinfo
.vertree
= t
;
3842 if (t
->globals
!= NULL
)
3844 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3845 if ((*d
->match
) (d
, alc
))
3849 /* See if there is anything to force this symbol to
3851 if (d
== NULL
&& t
->locals
!= NULL
)
3853 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3855 if ((*d
->match
) (d
, alc
))
3857 if (h
->dynindx
!= -1
3859 && ! sinfo
->export_dynamic
)
3861 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3862 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3863 /* FIXME: The name of the symbol has
3864 already been recorded in the dynamic
3865 string table section. */
3873 bfd_release (sinfo
->output_bfd
, alc
);
3878 /* If we are building an application, we need to create a
3879 version node for this version. */
3880 if (t
== NULL
&& ! info
->shared
)
3882 struct bfd_elf_version_tree
**pp
;
3885 /* If we aren't going to export this symbol, we don't need
3886 to worry about it. */
3887 if (h
->dynindx
== -1)
3890 t
= ((struct bfd_elf_version_tree
*)
3891 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3894 sinfo
->failed
= true;
3903 t
->name_indx
= (unsigned int) -1;
3907 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3909 t
->vernum
= version_index
;
3913 h
->verinfo
.vertree
= t
;
3917 /* We could not find the version for a symbol when
3918 generating a shared archive. Return an error. */
3919 (*_bfd_error_handler
)
3920 (_("%s: undefined versioned symbol name %s"),
3921 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3922 bfd_set_error (bfd_error_bad_value
);
3923 sinfo
->failed
= true;
3928 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3931 /* If we don't have a version for this symbol, see if we can find
3933 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3935 struct bfd_elf_version_tree
*t
;
3936 struct bfd_elf_version_tree
*deflt
;
3937 struct bfd_elf_version_expr
*d
;
3939 /* See if can find what version this symbol is in. If the
3940 symbol is supposed to be local, then don't actually register
3943 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3945 if (t
->globals
!= NULL
)
3947 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3949 if ((*d
->match
) (d
, h
->root
.root
.string
))
3951 h
->verinfo
.vertree
= t
;
3960 if (t
->locals
!= NULL
)
3962 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3964 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3966 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3968 h
->verinfo
.vertree
= t
;
3969 if (h
->dynindx
!= -1
3971 && ! sinfo
->export_dynamic
)
3973 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3974 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3975 /* FIXME: The name of the symbol has already
3976 been recorded in the dynamic string table
3988 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3990 h
->verinfo
.vertree
= deflt
;
3991 if (h
->dynindx
!= -1
3993 && ! sinfo
->export_dynamic
)
3995 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3996 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3997 /* FIXME: The name of the symbol has already been
3998 recorded in the dynamic string table section. */
4006 /* Final phase of ELF linker. */
4008 /* A structure we use to avoid passing large numbers of arguments. */
4010 struct elf_final_link_info
4012 /* General link information. */
4013 struct bfd_link_info
*info
;
4016 /* Symbol string table. */
4017 struct bfd_strtab_hash
*symstrtab
;
4018 /* .dynsym section. */
4019 asection
*dynsym_sec
;
4020 /* .hash section. */
4022 /* symbol version section (.gnu.version). */
4023 asection
*symver_sec
;
4024 /* Buffer large enough to hold contents of any section. */
4026 /* Buffer large enough to hold external relocs of any section. */
4027 PTR external_relocs
;
4028 /* Buffer large enough to hold internal relocs of any section. */
4029 Elf_Internal_Rela
*internal_relocs
;
4030 /* Buffer large enough to hold external local symbols of any input
4032 Elf_External_Sym
*external_syms
;
4033 /* Buffer large enough to hold internal local symbols of any input
4035 Elf_Internal_Sym
*internal_syms
;
4036 /* Array large enough to hold a symbol index for each local symbol
4037 of any input BFD. */
4039 /* Array large enough to hold a section pointer for each local
4040 symbol of any input BFD. */
4041 asection
**sections
;
4042 /* Buffer to hold swapped out symbols. */
4043 Elf_External_Sym
*symbuf
;
4044 /* Number of swapped out symbols in buffer. */
4045 size_t symbuf_count
;
4046 /* Number of symbols which fit in symbuf. */
4050 static boolean elf_link_output_sym
4051 PARAMS ((struct elf_final_link_info
*, const char *,
4052 Elf_Internal_Sym
*, asection
*));
4053 static boolean elf_link_flush_output_syms
4054 PARAMS ((struct elf_final_link_info
*));
4055 static boolean elf_link_output_extsym
4056 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4057 static boolean elf_link_input_bfd
4058 PARAMS ((struct elf_final_link_info
*, bfd
*));
4059 static boolean elf_reloc_link_order
4060 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4061 struct bfd_link_order
*));
4063 /* This struct is used to pass information to elf_link_output_extsym. */
4065 struct elf_outext_info
4069 struct elf_final_link_info
*finfo
;
4072 /* Compute the size of, and allocate space for, REL_HDR which is the
4073 section header for a section containing relocations for O. */
4076 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4078 Elf_Internal_Shdr
*rel_hdr
;
4081 register struct elf_link_hash_entry
**p
, **pend
;
4082 unsigned reloc_count
;
4084 /* Figure out how many relocations there will be. */
4085 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4086 reloc_count
= elf_section_data (o
)->rel_count
;
4088 reloc_count
= elf_section_data (o
)->rel_count2
;
4090 /* That allows us to calculate the size of the section. */
4091 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4093 /* The contents field must last into write_object_contents, so we
4094 allocate it with bfd_alloc rather than malloc. Also since we
4095 cannot be sure that the contents will actually be filled in,
4096 we zero the allocated space. */
4097 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4098 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4101 /* We only allocate one set of hash entries, so we only do it the
4102 first time we are called. */
4103 if (elf_section_data (o
)->rel_hashes
== NULL
)
4105 p
= ((struct elf_link_hash_entry
**)
4106 bfd_malloc (o
->reloc_count
4107 * sizeof (struct elf_link_hash_entry
*)));
4108 if (p
== NULL
&& o
->reloc_count
!= 0)
4111 elf_section_data (o
)->rel_hashes
= p
;
4112 pend
= p
+ o
->reloc_count
;
4113 for (; p
< pend
; p
++)
4120 /* When performing a relocateable link, the input relocations are
4121 preserved. But, if they reference global symbols, the indices
4122 referenced must be updated. Update all the relocations in
4123 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4126 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4128 Elf_Internal_Shdr
*rel_hdr
;
4130 struct elf_link_hash_entry
**rel_hash
;
4133 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4135 for (i
= 0; i
< count
; i
++, rel_hash
++)
4137 if (*rel_hash
== NULL
)
4140 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4142 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4144 Elf_External_Rel
*erel
;
4145 Elf_Internal_Rel irel
;
4147 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4148 if (bed
->s
->swap_reloc_in
)
4149 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &irel
);
4151 elf_swap_reloc_in (abfd
, erel
, &irel
);
4152 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4153 ELF_R_TYPE (irel
.r_info
));
4154 if (bed
->s
->swap_reloc_out
)
4155 (*bed
->s
->swap_reloc_out
) (abfd
, &irel
, (bfd_byte
*) erel
);
4157 elf_swap_reloc_out (abfd
, &irel
, erel
);
4161 Elf_External_Rela
*erela
;
4162 Elf_Internal_Rela irela
;
4164 BFD_ASSERT (rel_hdr
->sh_entsize
4165 == sizeof (Elf_External_Rela
));
4167 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4168 if (bed
->s
->swap_reloca_in
)
4169 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, &irela
);
4171 elf_swap_reloca_in (abfd
, erela
, &irela
);
4172 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4173 ELF_R_TYPE (irela
.r_info
));
4174 if (bed
->s
->swap_reloca_out
)
4175 (*bed
->s
->swap_reloca_out
) (abfd
, &irela
, (bfd_byte
*) erela
);
4177 elf_swap_reloca_out (abfd
, &irela
, erela
);
4182 /* Do the final step of an ELF link. */
4185 elf_bfd_final_link (abfd
, info
)
4187 struct bfd_link_info
*info
;
4191 struct elf_final_link_info finfo
;
4192 register asection
*o
;
4193 register struct bfd_link_order
*p
;
4195 size_t max_contents_size
;
4196 size_t max_external_reloc_size
;
4197 size_t max_internal_reloc_count
;
4198 size_t max_sym_count
;
4200 Elf_Internal_Sym elfsym
;
4202 Elf_Internal_Shdr
*symtab_hdr
;
4203 Elf_Internal_Shdr
*symstrtab_hdr
;
4204 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4205 struct elf_outext_info eoinfo
;
4208 abfd
->flags
|= DYNAMIC
;
4210 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4211 dynobj
= elf_hash_table (info
)->dynobj
;
4214 finfo
.output_bfd
= abfd
;
4215 finfo
.symstrtab
= elf_stringtab_init ();
4216 if (finfo
.symstrtab
== NULL
)
4221 finfo
.dynsym_sec
= NULL
;
4222 finfo
.hash_sec
= NULL
;
4223 finfo
.symver_sec
= NULL
;
4227 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4228 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4229 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4230 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4231 /* Note that it is OK if symver_sec is NULL. */
4234 finfo
.contents
= NULL
;
4235 finfo
.external_relocs
= NULL
;
4236 finfo
.internal_relocs
= NULL
;
4237 finfo
.external_syms
= NULL
;
4238 finfo
.internal_syms
= NULL
;
4239 finfo
.indices
= NULL
;
4240 finfo
.sections
= NULL
;
4241 finfo
.symbuf
= NULL
;
4242 finfo
.symbuf_count
= 0;
4244 /* Count up the number of relocations we will output for each output
4245 section, so that we know the sizes of the reloc sections. We
4246 also figure out some maximum sizes. */
4247 max_contents_size
= 0;
4248 max_external_reloc_size
= 0;
4249 max_internal_reloc_count
= 0;
4251 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4255 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4257 if (p
->type
== bfd_section_reloc_link_order
4258 || p
->type
== bfd_symbol_reloc_link_order
)
4260 else if (p
->type
== bfd_indirect_link_order
)
4264 sec
= p
->u
.indirect
.section
;
4266 /* Mark all sections which are to be included in the
4267 link. This will normally be every section. We need
4268 to do this so that we can identify any sections which
4269 the linker has decided to not include. */
4270 sec
->linker_mark
= true;
4272 if (info
->relocateable
|| info
->emitrelocations
)
4273 o
->reloc_count
+= sec
->reloc_count
;
4275 if (sec
->_raw_size
> max_contents_size
)
4276 max_contents_size
= sec
->_raw_size
;
4277 if (sec
->_cooked_size
> max_contents_size
)
4278 max_contents_size
= sec
->_cooked_size
;
4280 /* We are interested in just local symbols, not all
4282 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4283 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4287 if (elf_bad_symtab (sec
->owner
))
4288 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4289 / sizeof (Elf_External_Sym
));
4291 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4293 if (sym_count
> max_sym_count
)
4294 max_sym_count
= sym_count
;
4296 if ((sec
->flags
& SEC_RELOC
) != 0)
4300 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4301 if (ext_size
> max_external_reloc_size
)
4302 max_external_reloc_size
= ext_size
;
4303 if (sec
->reloc_count
> max_internal_reloc_count
)
4304 max_internal_reloc_count
= sec
->reloc_count
;
4310 if (o
->reloc_count
> 0)
4311 o
->flags
|= SEC_RELOC
;
4314 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4315 set it (this is probably a bug) and if it is set
4316 assign_section_numbers will create a reloc section. */
4317 o
->flags
&=~ SEC_RELOC
;
4320 /* If the SEC_ALLOC flag is not set, force the section VMA to
4321 zero. This is done in elf_fake_sections as well, but forcing
4322 the VMA to 0 here will ensure that relocs against these
4323 sections are handled correctly. */
4324 if ((o
->flags
& SEC_ALLOC
) == 0
4325 && ! o
->user_set_vma
)
4329 /* Figure out the file positions for everything but the symbol table
4330 and the relocs. We set symcount to force assign_section_numbers
4331 to create a symbol table. */
4332 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4333 BFD_ASSERT (! abfd
->output_has_begun
);
4334 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4337 /* Figure out how many relocations we will have in each section.
4338 Just using RELOC_COUNT isn't good enough since that doesn't
4339 maintain a separate value for REL vs. RELA relocations. */
4340 if (info
->relocateable
|| info
->emitrelocations
)
4341 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4342 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4344 asection
*output_section
;
4346 if (! o
->linker_mark
)
4348 /* This section was omitted from the link. */
4352 output_section
= o
->output_section
;
4354 if (output_section
!= NULL
4355 && (o
->flags
& SEC_RELOC
) != 0)
4357 struct bfd_elf_section_data
*esdi
4358 = elf_section_data (o
);
4359 struct bfd_elf_section_data
*esdo
4360 = elf_section_data (output_section
);
4361 unsigned int *rel_count
;
4362 unsigned int *rel_count2
;
4364 /* We must be careful to add the relocation froms the
4365 input section to the right output count. */
4366 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
4368 rel_count
= &esdo
->rel_count
;
4369 rel_count2
= &esdo
->rel_count2
;
4373 rel_count
= &esdo
->rel_count2
;
4374 rel_count2
= &esdo
->rel_count
;
4377 *rel_count
+= (esdi
->rel_hdr
.sh_size
4378 / esdi
->rel_hdr
.sh_entsize
);
4380 *rel_count2
+= (esdi
->rel_hdr2
->sh_size
4381 / esdi
->rel_hdr2
->sh_entsize
);
4385 /* That created the reloc sections. Set their sizes, and assign
4386 them file positions, and allocate some buffers. */
4387 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4389 if ((o
->flags
& SEC_RELOC
) != 0)
4391 if (!elf_link_size_reloc_section (abfd
,
4392 &elf_section_data (o
)->rel_hdr
,
4396 if (elf_section_data (o
)->rel_hdr2
4397 && !elf_link_size_reloc_section (abfd
,
4398 elf_section_data (o
)->rel_hdr2
,
4403 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4404 to count upwards while actually outputting the relocations. */
4405 elf_section_data (o
)->rel_count
= 0;
4406 elf_section_data (o
)->rel_count2
= 0;
4409 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4411 /* We have now assigned file positions for all the sections except
4412 .symtab and .strtab. We start the .symtab section at the current
4413 file position, and write directly to it. We build the .strtab
4414 section in memory. */
4415 bfd_get_symcount (abfd
) = 0;
4416 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4417 /* sh_name is set in prep_headers. */
4418 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4419 symtab_hdr
->sh_flags
= 0;
4420 symtab_hdr
->sh_addr
= 0;
4421 symtab_hdr
->sh_size
= 0;
4422 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4423 /* sh_link is set in assign_section_numbers. */
4424 /* sh_info is set below. */
4425 /* sh_offset is set just below. */
4426 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4428 off
= elf_tdata (abfd
)->next_file_pos
;
4429 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4431 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4432 incorrect. We do not yet know the size of the .symtab section.
4433 We correct next_file_pos below, after we do know the size. */
4435 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4436 continuously seeking to the right position in the file. */
4437 if (! info
->keep_memory
|| max_sym_count
< 20)
4438 finfo
.symbuf_size
= 20;
4440 finfo
.symbuf_size
= max_sym_count
;
4441 finfo
.symbuf
= ((Elf_External_Sym
*)
4442 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4443 if (finfo
.symbuf
== NULL
)
4446 /* Start writing out the symbol table. The first symbol is always a
4448 if (info
->strip
!= strip_all
|| info
->relocateable
|| info
->emitrelocations
)
4450 elfsym
.st_value
= 0;
4453 elfsym
.st_other
= 0;
4454 elfsym
.st_shndx
= SHN_UNDEF
;
4455 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4456 &elfsym
, bfd_und_section_ptr
))
4461 /* Some standard ELF linkers do this, but we don't because it causes
4462 bootstrap comparison failures. */
4463 /* Output a file symbol for the output file as the second symbol.
4464 We output this even if we are discarding local symbols, although
4465 I'm not sure if this is correct. */
4466 elfsym
.st_value
= 0;
4468 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4469 elfsym
.st_other
= 0;
4470 elfsym
.st_shndx
= SHN_ABS
;
4471 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4472 &elfsym
, bfd_abs_section_ptr
))
4476 /* Output a symbol for each section. We output these even if we are
4477 discarding local symbols, since they are used for relocs. These
4478 symbols have no names. We store the index of each one in the
4479 index field of the section, so that we can find it again when
4480 outputting relocs. */
4481 if (info
->strip
!= strip_all
|| info
->relocateable
|| info
->emitrelocations
)
4484 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4485 elfsym
.st_other
= 0;
4486 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4488 o
= section_from_elf_index (abfd
, i
);
4490 o
->target_index
= bfd_get_symcount (abfd
);
4491 elfsym
.st_shndx
= i
;
4492 if (info
->relocateable
|| o
== NULL
)
4493 elfsym
.st_value
= 0;
4495 elfsym
.st_value
= o
->vma
;
4496 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4502 /* Allocate some memory to hold information read in from the input
4504 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4505 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4506 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4507 bfd_malloc (max_internal_reloc_count
4508 * sizeof (Elf_Internal_Rela
)
4509 * bed
->s
->int_rels_per_ext_rel
));
4510 finfo
.external_syms
= ((Elf_External_Sym
*)
4511 bfd_malloc (max_sym_count
4512 * sizeof (Elf_External_Sym
)));
4513 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4514 bfd_malloc (max_sym_count
4515 * sizeof (Elf_Internal_Sym
)));
4516 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4517 finfo
.sections
= ((asection
**)
4518 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4519 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4520 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4521 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4522 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4523 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4524 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4525 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4528 /* Since ELF permits relocations to be against local symbols, we
4529 must have the local symbols available when we do the relocations.
4530 Since we would rather only read the local symbols once, and we
4531 would rather not keep them in memory, we handle all the
4532 relocations for a single input file at the same time.
4534 Unfortunately, there is no way to know the total number of local
4535 symbols until we have seen all of them, and the local symbol
4536 indices precede the global symbol indices. This means that when
4537 we are generating relocateable output, and we see a reloc against
4538 a global symbol, we can not know the symbol index until we have
4539 finished examining all the local symbols to see which ones we are
4540 going to output. To deal with this, we keep the relocations in
4541 memory, and don't output them until the end of the link. This is
4542 an unfortunate waste of memory, but I don't see a good way around
4543 it. Fortunately, it only happens when performing a relocateable
4544 link, which is not the common case. FIXME: If keep_memory is set
4545 we could write the relocs out and then read them again; I don't
4546 know how bad the memory loss will be. */
4548 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4549 sub
->output_has_begun
= false;
4550 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4552 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4554 if (p
->type
== bfd_indirect_link_order
4555 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4556 == bfd_target_elf_flavour
))
4558 sub
= p
->u
.indirect
.section
->owner
;
4559 if (! sub
->output_has_begun
)
4561 if (! elf_link_input_bfd (&finfo
, sub
))
4563 sub
->output_has_begun
= true;
4566 else if (p
->type
== bfd_section_reloc_link_order
4567 || p
->type
== bfd_symbol_reloc_link_order
)
4569 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4574 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4580 /* That wrote out all the local symbols. Finish up the symbol table
4581 with the global symbols. Even if we want to strip everything we
4582 can, we still need to deal with those global symbols that got
4583 converted to local in a version script. */
4587 /* Output any global symbols that got converted to local in a
4588 version script. We do this in a separate step since ELF
4589 requires all local symbols to appear prior to any global
4590 symbols. FIXME: We should only do this if some global
4591 symbols were, in fact, converted to become local. FIXME:
4592 Will this work correctly with the Irix 5 linker? */
4593 eoinfo
.failed
= false;
4594 eoinfo
.finfo
= &finfo
;
4595 eoinfo
.localsyms
= true;
4596 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4602 /* The sh_info field records the index of the first non local symbol. */
4603 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4607 Elf_Internal_Sym sym
;
4608 Elf_External_Sym
*dynsym
=
4609 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4610 long last_local
= 0;
4612 /* Write out the section symbols for the output sections. */
4619 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4622 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4625 indx
= elf_section_data (s
)->this_idx
;
4626 BFD_ASSERT (indx
> 0);
4627 sym
.st_shndx
= indx
;
4628 sym
.st_value
= s
->vma
;
4630 elf_swap_symbol_out (abfd
, &sym
,
4631 dynsym
+ elf_section_data (s
)->dynindx
);
4634 last_local
= bfd_count_sections (abfd
);
4637 /* Write out the local dynsyms. */
4638 if (elf_hash_table (info
)->dynlocal
)
4640 struct elf_link_local_dynamic_entry
*e
;
4641 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4645 sym
.st_size
= e
->isym
.st_size
;
4646 sym
.st_other
= e
->isym
.st_other
;
4648 /* Copy the internal symbol as is.
4649 Note that we saved a word of storage and overwrote
4650 the original st_name with the dynstr_index. */
4653 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4655 s
= bfd_section_from_elf_index (e
->input_bfd
,
4659 elf_section_data (s
->output_section
)->this_idx
;
4660 sym
.st_value
= (s
->output_section
->vma
4662 + e
->isym
.st_value
);
4665 if (last_local
< e
->dynindx
)
4666 last_local
= e
->dynindx
;
4668 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4672 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
4676 /* We get the global symbols from the hash table. */
4677 eoinfo
.failed
= false;
4678 eoinfo
.localsyms
= false;
4679 eoinfo
.finfo
= &finfo
;
4680 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4685 /* If backend needs to output some symbols not present in the hash
4686 table, do it now. */
4687 if (bed
->elf_backend_output_arch_syms
)
4689 if (! (*bed
->elf_backend_output_arch_syms
)
4690 (abfd
, info
, (PTR
) &finfo
,
4691 (boolean (*) PARAMS ((PTR
, const char *,
4692 Elf_Internal_Sym
*, asection
*)))
4693 elf_link_output_sym
))
4697 /* Flush all symbols to the file. */
4698 if (! elf_link_flush_output_syms (&finfo
))
4701 /* Now we know the size of the symtab section. */
4702 off
+= symtab_hdr
->sh_size
;
4704 /* Finish up and write out the symbol string table (.strtab)
4706 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4707 /* sh_name was set in prep_headers. */
4708 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4709 symstrtab_hdr
->sh_flags
= 0;
4710 symstrtab_hdr
->sh_addr
= 0;
4711 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4712 symstrtab_hdr
->sh_entsize
= 0;
4713 symstrtab_hdr
->sh_link
= 0;
4714 symstrtab_hdr
->sh_info
= 0;
4715 /* sh_offset is set just below. */
4716 symstrtab_hdr
->sh_addralign
= 1;
4718 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4719 elf_tdata (abfd
)->next_file_pos
= off
;
4721 if (bfd_get_symcount (abfd
) > 0)
4723 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4724 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4728 /* Adjust the relocs to have the correct symbol indices. */
4729 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4731 if ((o
->flags
& SEC_RELOC
) == 0)
4734 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4735 elf_section_data (o
)->rel_count
,
4736 elf_section_data (o
)->rel_hashes
);
4737 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4738 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4739 elf_section_data (o
)->rel_count2
,
4740 (elf_section_data (o
)->rel_hashes
4741 + elf_section_data (o
)->rel_count
));
4743 /* Set the reloc_count field to 0 to prevent write_relocs from
4744 trying to swap the relocs out itself. */
4748 /* If we are linking against a dynamic object, or generating a
4749 shared library, finish up the dynamic linking information. */
4752 Elf_External_Dyn
*dyncon
, *dynconend
;
4754 /* Fix up .dynamic entries. */
4755 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4756 BFD_ASSERT (o
!= NULL
);
4758 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4759 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4760 for (; dyncon
< dynconend
; dyncon
++)
4762 Elf_Internal_Dyn dyn
;
4766 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4773 name
= info
->init_function
;
4776 name
= info
->fini_function
;
4779 struct elf_link_hash_entry
*h
;
4781 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4782 false, false, true);
4784 && (h
->root
.type
== bfd_link_hash_defined
4785 || h
->root
.type
== bfd_link_hash_defweak
))
4787 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4788 o
= h
->root
.u
.def
.section
;
4789 if (o
->output_section
!= NULL
)
4790 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4791 + o
->output_offset
);
4794 /* The symbol is imported from another shared
4795 library and does not apply to this one. */
4799 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4814 name
= ".gnu.version_d";
4817 name
= ".gnu.version_r";
4820 name
= ".gnu.version";
4822 o
= bfd_get_section_by_name (abfd
, name
);
4823 BFD_ASSERT (o
!= NULL
);
4824 dyn
.d_un
.d_ptr
= o
->vma
;
4825 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4832 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4837 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4839 Elf_Internal_Shdr
*hdr
;
4841 hdr
= elf_elfsections (abfd
)[i
];
4842 if (hdr
->sh_type
== type
4843 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4845 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4846 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4849 if (dyn
.d_un
.d_val
== 0
4850 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4851 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4855 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4861 /* If we have created any dynamic sections, then output them. */
4864 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4867 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4869 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4870 || o
->_raw_size
== 0)
4872 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4874 /* At this point, we are only interested in sections
4875 created by elf_link_create_dynamic_sections. */
4878 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4880 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4882 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4883 o
->contents
, o
->output_offset
,
4891 /* The contents of the .dynstr section are actually in a
4893 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4894 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4895 || ! _bfd_stringtab_emit (abfd
,
4896 elf_hash_table (info
)->dynstr
))
4902 /* If we have optimized stabs strings, output them. */
4903 if (elf_hash_table (info
)->stab_info
!= NULL
)
4905 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4909 if (finfo
.symstrtab
!= NULL
)
4910 _bfd_stringtab_free (finfo
.symstrtab
);
4911 if (finfo
.contents
!= NULL
)
4912 free (finfo
.contents
);
4913 if (finfo
.external_relocs
!= NULL
)
4914 free (finfo
.external_relocs
);
4915 if (finfo
.internal_relocs
!= NULL
)
4916 free (finfo
.internal_relocs
);
4917 if (finfo
.external_syms
!= NULL
)
4918 free (finfo
.external_syms
);
4919 if (finfo
.internal_syms
!= NULL
)
4920 free (finfo
.internal_syms
);
4921 if (finfo
.indices
!= NULL
)
4922 free (finfo
.indices
);
4923 if (finfo
.sections
!= NULL
)
4924 free (finfo
.sections
);
4925 if (finfo
.symbuf
!= NULL
)
4926 free (finfo
.symbuf
);
4927 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4929 if ((o
->flags
& SEC_RELOC
) != 0
4930 && elf_section_data (o
)->rel_hashes
!= NULL
)
4931 free (elf_section_data (o
)->rel_hashes
);
4934 elf_tdata (abfd
)->linker
= true;
4939 if (finfo
.symstrtab
!= NULL
)
4940 _bfd_stringtab_free (finfo
.symstrtab
);
4941 if (finfo
.contents
!= NULL
)
4942 free (finfo
.contents
);
4943 if (finfo
.external_relocs
!= NULL
)
4944 free (finfo
.external_relocs
);
4945 if (finfo
.internal_relocs
!= NULL
)
4946 free (finfo
.internal_relocs
);
4947 if (finfo
.external_syms
!= NULL
)
4948 free (finfo
.external_syms
);
4949 if (finfo
.internal_syms
!= NULL
)
4950 free (finfo
.internal_syms
);
4951 if (finfo
.indices
!= NULL
)
4952 free (finfo
.indices
);
4953 if (finfo
.sections
!= NULL
)
4954 free (finfo
.sections
);
4955 if (finfo
.symbuf
!= NULL
)
4956 free (finfo
.symbuf
);
4957 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4959 if ((o
->flags
& SEC_RELOC
) != 0
4960 && elf_section_data (o
)->rel_hashes
!= NULL
)
4961 free (elf_section_data (o
)->rel_hashes
);
4967 /* Add a symbol to the output symbol table. */
4970 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4971 struct elf_final_link_info
*finfo
;
4973 Elf_Internal_Sym
*elfsym
;
4974 asection
*input_sec
;
4976 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4977 struct bfd_link_info
*info
,
4982 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4983 elf_backend_link_output_symbol_hook
;
4984 if (output_symbol_hook
!= NULL
)
4986 if (! ((*output_symbol_hook
)
4987 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4991 if (name
== (const char *) NULL
|| *name
== '\0')
4992 elfsym
->st_name
= 0;
4993 else if (input_sec
->flags
& SEC_EXCLUDE
)
4994 elfsym
->st_name
= 0;
4997 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5000 if (elfsym
->st_name
== (unsigned long) -1)
5004 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5006 if (! elf_link_flush_output_syms (finfo
))
5010 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
5011 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
5012 ++finfo
->symbuf_count
;
5014 ++ bfd_get_symcount (finfo
->output_bfd
);
5019 /* Flush the output symbols to the file. */
5022 elf_link_flush_output_syms (finfo
)
5023 struct elf_final_link_info
*finfo
;
5025 if (finfo
->symbuf_count
> 0)
5027 Elf_Internal_Shdr
*symtab
;
5029 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5031 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
5033 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
5034 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
5035 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
5038 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
5040 finfo
->symbuf_count
= 0;
5046 /* Add an external symbol to the symbol table. This is called from
5047 the hash table traversal routine. When generating a shared object,
5048 we go through the symbol table twice. The first time we output
5049 anything that might have been forced to local scope in a version
5050 script. The second time we output the symbols that are still
5054 elf_link_output_extsym (h
, data
)
5055 struct elf_link_hash_entry
*h
;
5058 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
5059 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5061 Elf_Internal_Sym sym
;
5062 asection
*input_sec
;
5064 /* Decide whether to output this symbol in this pass. */
5065 if (eoinfo
->localsyms
)
5067 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5072 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5076 /* If we are not creating a shared library, and this symbol is
5077 referenced by a shared library but is not defined anywhere, then
5078 warn that it is undefined. If we do not do this, the runtime
5079 linker will complain that the symbol is undefined when the
5080 program is run. We don't have to worry about symbols that are
5081 referenced by regular files, because we will already have issued
5082 warnings for them. */
5083 if (! finfo
->info
->relocateable
5084 && ! (finfo
->info
->shared
5085 && !finfo
->info
->no_undefined
)
5086 && h
->root
.type
== bfd_link_hash_undefined
5087 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5088 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5090 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5091 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5092 (asection
*) NULL
, 0, true)))
5094 eoinfo
->failed
= true;
5099 /* We don't want to output symbols that have never been mentioned by
5100 a regular file, or that we have been told to strip. However, if
5101 h->indx is set to -2, the symbol is used by a reloc and we must
5105 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
5106 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
5107 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
5108 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5110 else if (finfo
->info
->strip
== strip_all
5111 || (finfo
->info
->strip
== strip_some
5112 && bfd_hash_lookup (finfo
->info
->keep_hash
,
5113 h
->root
.root
.string
,
5114 false, false) == NULL
))
5119 /* If we're stripping it, and it's not a dynamic symbol, there's
5120 nothing else to do unless it is a forced local symbol. */
5123 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5127 sym
.st_size
= h
->size
;
5128 sym
.st_other
= h
->other
;
5129 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5130 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
5131 else if (h
->root
.type
== bfd_link_hash_undefweak
5132 || h
->root
.type
== bfd_link_hash_defweak
)
5133 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
5135 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
5137 switch (h
->root
.type
)
5140 case bfd_link_hash_new
:
5144 case bfd_link_hash_undefined
:
5145 input_sec
= bfd_und_section_ptr
;
5146 sym
.st_shndx
= SHN_UNDEF
;
5149 case bfd_link_hash_undefweak
:
5150 input_sec
= bfd_und_section_ptr
;
5151 sym
.st_shndx
= SHN_UNDEF
;
5154 case bfd_link_hash_defined
:
5155 case bfd_link_hash_defweak
:
5157 input_sec
= h
->root
.u
.def
.section
;
5158 if (input_sec
->output_section
!= NULL
)
5161 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
5162 input_sec
->output_section
);
5163 if (sym
.st_shndx
== (unsigned short) -1)
5165 (*_bfd_error_handler
)
5166 (_("%s: could not find output section %s for input section %s"),
5167 bfd_get_filename (finfo
->output_bfd
),
5168 input_sec
->output_section
->name
,
5170 eoinfo
->failed
= true;
5174 /* ELF symbols in relocateable files are section relative,
5175 but in nonrelocateable files they are virtual
5177 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
5178 if (! finfo
->info
->relocateable
)
5179 sym
.st_value
+= input_sec
->output_section
->vma
;
5183 BFD_ASSERT (input_sec
->owner
== NULL
5184 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
5185 sym
.st_shndx
= SHN_UNDEF
;
5186 input_sec
= bfd_und_section_ptr
;
5191 case bfd_link_hash_common
:
5192 input_sec
= h
->root
.u
.c
.p
->section
;
5193 sym
.st_shndx
= SHN_COMMON
;
5194 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
5197 case bfd_link_hash_indirect
:
5198 /* These symbols are created by symbol versioning. They point
5199 to the decorated version of the name. For example, if the
5200 symbol foo@@GNU_1.2 is the default, which should be used when
5201 foo is used with no version, then we add an indirect symbol
5202 foo which points to foo@@GNU_1.2. We ignore these symbols,
5203 since the indirected symbol is already in the hash table. */
5206 case bfd_link_hash_warning
:
5207 /* We can't represent these symbols in ELF, although a warning
5208 symbol may have come from a .gnu.warning.SYMBOL section. We
5209 just put the target symbol in the hash table. If the target
5210 symbol does not really exist, don't do anything. */
5211 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
5213 return (elf_link_output_extsym
5214 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
5217 /* Give the processor backend a chance to tweak the symbol value,
5218 and also to finish up anything that needs to be done for this
5220 if ((h
->dynindx
!= -1
5221 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5222 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5224 struct elf_backend_data
*bed
;
5226 bed
= get_elf_backend_data (finfo
->output_bfd
);
5227 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
5228 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
5230 eoinfo
->failed
= true;
5235 /* If we are marking the symbol as undefined, and there are no
5236 non-weak references to this symbol from a regular object, then
5237 mark the symbol as weak undefined; if there are non-weak
5238 references, mark the symbol as strong. We can't do this earlier,
5239 because it might not be marked as undefined until the
5240 finish_dynamic_symbol routine gets through with it. */
5241 if (sym
.st_shndx
== SHN_UNDEF
5242 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
5243 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
5244 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
5248 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
5249 bindtype
= STB_GLOBAL
;
5251 bindtype
= STB_WEAK
;
5252 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
5255 /* If a symbol is not defined locally, we clear the visibility
5257 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5258 sym
.st_other
^= ELF_ST_VISIBILITY(sym
.st_other
);
5260 /* If this symbol should be put in the .dynsym section, then put it
5261 there now. We have already know the symbol index. We also fill
5262 in the entry in the .hash section. */
5263 if (h
->dynindx
!= -1
5264 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5268 size_t hash_entry_size
;
5269 bfd_byte
*bucketpos
;
5272 sym
.st_name
= h
->dynstr_index
;
5274 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
5275 (PTR
) (((Elf_External_Sym
*)
5276 finfo
->dynsym_sec
->contents
)
5279 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
5280 bucket
= h
->elf_hash_value
% bucketcount
;
5282 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
5283 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
5284 + (bucket
+ 2) * hash_entry_size
);
5285 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
5286 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
5287 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
5288 ((bfd_byte
*) finfo
->hash_sec
->contents
5289 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
5291 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
5293 Elf_Internal_Versym iversym
;
5295 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5297 if (h
->verinfo
.verdef
== NULL
)
5298 iversym
.vs_vers
= 0;
5300 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
5304 if (h
->verinfo
.vertree
== NULL
)
5305 iversym
.vs_vers
= 1;
5307 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
5310 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
5311 iversym
.vs_vers
|= VERSYM_HIDDEN
;
5313 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
5314 (((Elf_External_Versym
*)
5315 finfo
->symver_sec
->contents
)
5320 /* If we're stripping it, then it was just a dynamic symbol, and
5321 there's nothing else to do. */
5325 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
5327 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
5329 eoinfo
->failed
= true;
5336 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5337 originated from the section given by INPUT_REL_HDR) to the
5341 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
5344 asection
*input_section
;
5345 Elf_Internal_Shdr
*input_rel_hdr
;
5346 Elf_Internal_Rela
*internal_relocs
;
5348 Elf_Internal_Rela
*irela
;
5349 Elf_Internal_Rela
*irelaend
;
5350 Elf_Internal_Shdr
*output_rel_hdr
;
5351 asection
*output_section
;
5352 unsigned int *rel_countp
= NULL
;
5353 struct elf_backend_data
*bed
;
5355 output_section
= input_section
->output_section
;
5356 output_rel_hdr
= NULL
;
5358 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
5359 == input_rel_hdr
->sh_entsize
)
5361 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5362 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5364 else if (elf_section_data (output_section
)->rel_hdr2
5365 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5366 == input_rel_hdr
->sh_entsize
))
5368 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5369 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5372 BFD_ASSERT (output_rel_hdr
!= NULL
);
5374 bed
= get_elf_backend_data (output_bfd
);
5375 irela
= internal_relocs
;
5376 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5377 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5379 Elf_External_Rel
*erel
;
5381 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5382 for (; irela
< irelaend
; irela
++, erel
++)
5384 Elf_Internal_Rel irel
;
5386 irel
.r_offset
= irela
->r_offset
;
5387 irel
.r_info
= irela
->r_info
;
5388 BFD_ASSERT (irela
->r_addend
== 0);
5389 if (bed
->s
->swap_reloc_out
)
5390 (*bed
->s
->swap_reloc_out
) (output_bfd
, &irel
, (PTR
) erel
);
5392 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5397 Elf_External_Rela
*erela
;
5399 BFD_ASSERT (input_rel_hdr
->sh_entsize
5400 == sizeof (Elf_External_Rela
));
5401 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5402 for (; irela
< irelaend
; irela
++, erela
++)
5403 if (bed
->s
->swap_reloca_out
)
5404 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
5406 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5409 /* Bump the counter, so that we know where to add the next set of
5411 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5414 /* Link an input file into the linker output file. This function
5415 handles all the sections and relocations of the input file at once.
5416 This is so that we only have to read the local symbols once, and
5417 don't have to keep them in memory. */
5420 elf_link_input_bfd (finfo
, input_bfd
)
5421 struct elf_final_link_info
*finfo
;
5424 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5425 bfd
*, asection
*, bfd_byte
*,
5426 Elf_Internal_Rela
*,
5427 Elf_Internal_Sym
*, asection
**));
5429 Elf_Internal_Shdr
*symtab_hdr
;
5432 Elf_External_Sym
*external_syms
;
5433 Elf_External_Sym
*esym
;
5434 Elf_External_Sym
*esymend
;
5435 Elf_Internal_Sym
*isym
;
5437 asection
**ppsection
;
5439 struct elf_backend_data
*bed
;
5441 output_bfd
= finfo
->output_bfd
;
5442 bed
= get_elf_backend_data (output_bfd
);
5443 relocate_section
= bed
->elf_backend_relocate_section
;
5445 /* If this is a dynamic object, we don't want to do anything here:
5446 we don't want the local symbols, and we don't want the section
5448 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5451 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5452 if (elf_bad_symtab (input_bfd
))
5454 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5459 locsymcount
= symtab_hdr
->sh_info
;
5460 extsymoff
= symtab_hdr
->sh_info
;
5463 /* Read the local symbols. */
5464 if (symtab_hdr
->contents
!= NULL
)
5465 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5466 else if (locsymcount
== 0)
5467 external_syms
= NULL
;
5470 external_syms
= finfo
->external_syms
;
5471 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5472 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5473 locsymcount
, input_bfd
)
5474 != locsymcount
* sizeof (Elf_External_Sym
)))
5478 /* Swap in the local symbols and write out the ones which we know
5479 are going into the output file. */
5480 esym
= external_syms
;
5481 esymend
= esym
+ locsymcount
;
5482 isym
= finfo
->internal_syms
;
5483 pindex
= finfo
->indices
;
5484 ppsection
= finfo
->sections
;
5485 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5489 Elf_Internal_Sym osym
;
5491 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5494 if (elf_bad_symtab (input_bfd
))
5496 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5503 if (isym
->st_shndx
== SHN_UNDEF
)
5504 isec
= bfd_und_section_ptr
;
5505 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5506 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5507 else if (isym
->st_shndx
== SHN_ABS
)
5508 isec
= bfd_abs_section_ptr
;
5509 else if (isym
->st_shndx
== SHN_COMMON
)
5510 isec
= bfd_com_section_ptr
;
5519 /* Don't output the first, undefined, symbol. */
5520 if (esym
== external_syms
)
5523 /* If we are stripping all symbols, we don't want to output this
5525 if (finfo
->info
->strip
== strip_all
)
5528 /* We never output section symbols. Instead, we use the section
5529 symbol of the corresponding section in the output file. */
5530 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5533 /* If we are discarding all local symbols, we don't want to
5534 output this one. If we are generating a relocateable output
5535 file, then some of the local symbols may be required by
5536 relocs; we output them below as we discover that they are
5538 if (finfo
->info
->discard
== discard_all
)
5541 /* If this symbol is defined in a section which we are
5542 discarding, we don't need to keep it, but note that
5543 linker_mark is only reliable for sections that have contents.
5544 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5545 as well as linker_mark. */
5546 if (isym
->st_shndx
> 0
5547 && isym
->st_shndx
< SHN_LORESERVE
5549 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5550 || (! finfo
->info
->relocateable
5551 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5554 /* Get the name of the symbol. */
5555 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5560 /* See if we are discarding symbols with this name. */
5561 if ((finfo
->info
->strip
== strip_some
5562 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5564 || (finfo
->info
->discard
== discard_l
5565 && bfd_is_local_label_name (input_bfd
, name
)))
5568 /* If we get here, we are going to output this symbol. */
5572 /* Adjust the section index for the output file. */
5573 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5574 isec
->output_section
);
5575 if (osym
.st_shndx
== (unsigned short) -1)
5578 *pindex
= bfd_get_symcount (output_bfd
);
5580 /* ELF symbols in relocateable files are section relative, but
5581 in executable files they are virtual addresses. Note that
5582 this code assumes that all ELF sections have an associated
5583 BFD section with a reasonable value for output_offset; below
5584 we assume that they also have a reasonable value for
5585 output_section. Any special sections must be set up to meet
5586 these requirements. */
5587 osym
.st_value
+= isec
->output_offset
;
5588 if (! finfo
->info
->relocateable
)
5589 osym
.st_value
+= isec
->output_section
->vma
;
5591 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5595 /* Relocate the contents of each section. */
5596 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5600 if (! o
->linker_mark
)
5602 /* This section was omitted from the link. */
5606 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5607 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5610 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5612 /* Section was created by elf_link_create_dynamic_sections
5617 /* Get the contents of the section. They have been cached by a
5618 relaxation routine. Note that o is a section in an input
5619 file, so the contents field will not have been set by any of
5620 the routines which work on output files. */
5621 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5622 contents
= elf_section_data (o
)->this_hdr
.contents
;
5625 contents
= finfo
->contents
;
5626 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5627 (file_ptr
) 0, o
->_raw_size
))
5631 if ((o
->flags
& SEC_RELOC
) != 0)
5633 Elf_Internal_Rela
*internal_relocs
;
5635 /* Get the swapped relocs. */
5636 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5637 (input_bfd
, o
, finfo
->external_relocs
,
5638 finfo
->internal_relocs
, false));
5639 if (internal_relocs
== NULL
5640 && o
->reloc_count
> 0)
5643 /* Relocate the section by invoking a back end routine.
5645 The back end routine is responsible for adjusting the
5646 section contents as necessary, and (if using Rela relocs
5647 and generating a relocateable output file) adjusting the
5648 reloc addend as necessary.
5650 The back end routine does not have to worry about setting
5651 the reloc address or the reloc symbol index.
5653 The back end routine is given a pointer to the swapped in
5654 internal symbols, and can access the hash table entries
5655 for the external symbols via elf_sym_hashes (input_bfd).
5657 When generating relocateable output, the back end routine
5658 must handle STB_LOCAL/STT_SECTION symbols specially. The
5659 output symbol is going to be a section symbol
5660 corresponding to the output section, which will require
5661 the addend to be adjusted. */
5663 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5664 input_bfd
, o
, contents
,
5666 finfo
->internal_syms
,
5670 if (finfo
->info
->relocateable
|| finfo
->info
->emitrelocations
)
5672 Elf_Internal_Rela
*irela
;
5673 Elf_Internal_Rela
*irelaend
;
5674 struct elf_link_hash_entry
**rel_hash
;
5675 Elf_Internal_Shdr
*input_rel_hdr
;
5677 /* Adjust the reloc addresses and symbol indices. */
5679 irela
= internal_relocs
;
5681 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5682 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5683 + elf_section_data (o
->output_section
)->rel_count
5684 + elf_section_data (o
->output_section
)->rel_count2
);
5685 for (; irela
< irelaend
; irela
++, rel_hash
++)
5687 unsigned long r_symndx
;
5688 Elf_Internal_Sym
*isym
;
5691 irela
->r_offset
+= o
->output_offset
;
5693 /* Relocs in an executable have to be virtual addresses. */
5694 if (finfo
->info
->emitrelocations
)
5695 irela
->r_offset
+= o
->output_section
->vma
;
5697 r_symndx
= ELF_R_SYM (irela
->r_info
);
5702 if (r_symndx
>= locsymcount
5703 || (elf_bad_symtab (input_bfd
)
5704 && finfo
->sections
[r_symndx
] == NULL
))
5706 struct elf_link_hash_entry
*rh
;
5709 /* This is a reloc against a global symbol. We
5710 have not yet output all the local symbols, so
5711 we do not know the symbol index of any global
5712 symbol. We set the rel_hash entry for this
5713 reloc to point to the global hash table entry
5714 for this symbol. The symbol index is then
5715 set at the end of elf_bfd_final_link. */
5716 indx
= r_symndx
- extsymoff
;
5717 rh
= elf_sym_hashes (input_bfd
)[indx
];
5718 while (rh
->root
.type
== bfd_link_hash_indirect
5719 || rh
->root
.type
== bfd_link_hash_warning
)
5720 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5722 /* Setting the index to -2 tells
5723 elf_link_output_extsym that this symbol is
5725 BFD_ASSERT (rh
->indx
< 0);
5733 /* This is a reloc against a local symbol. */
5736 isym
= finfo
->internal_syms
+ r_symndx
;
5737 sec
= finfo
->sections
[r_symndx
];
5738 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5740 /* I suppose the backend ought to fill in the
5741 section of any STT_SECTION symbol against a
5742 processor specific section. If we have
5743 discarded a section, the output_section will
5744 be the absolute section. */
5746 && (bfd_is_abs_section (sec
)
5747 || (sec
->output_section
!= NULL
5748 && bfd_is_abs_section (sec
->output_section
))))
5750 else if (sec
== NULL
|| sec
->owner
== NULL
)
5752 bfd_set_error (bfd_error_bad_value
);
5757 r_symndx
= sec
->output_section
->target_index
;
5758 BFD_ASSERT (r_symndx
!= 0);
5763 if (finfo
->indices
[r_symndx
] == -1)
5769 if (finfo
->info
->strip
== strip_all
)
5771 /* You can't do ld -r -s. */
5772 bfd_set_error (bfd_error_invalid_operation
);
5776 /* This symbol was skipped earlier, but
5777 since it is needed by a reloc, we
5778 must output it now. */
5779 link
= symtab_hdr
->sh_link
;
5780 name
= bfd_elf_string_from_elf_section (input_bfd
,
5786 osec
= sec
->output_section
;
5788 _bfd_elf_section_from_bfd_section (output_bfd
,
5790 if (isym
->st_shndx
== (unsigned short) -1)
5793 isym
->st_value
+= sec
->output_offset
;
5794 if (! finfo
->info
->relocateable
)
5795 isym
->st_value
+= osec
->vma
;
5797 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5799 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5803 r_symndx
= finfo
->indices
[r_symndx
];
5806 irela
->r_info
= ELF_R_INFO (r_symndx
,
5807 ELF_R_TYPE (irela
->r_info
));
5810 /* Swap out the relocs. */
5811 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5812 elf_link_output_relocs (output_bfd
, o
,
5816 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5817 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5819 elf_link_output_relocs (output_bfd
, o
,
5825 /* Write out the modified section contents. */
5826 if (elf_section_data (o
)->stab_info
== NULL
)
5828 if (! (o
->flags
& SEC_EXCLUDE
) &&
5829 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5830 contents
, o
->output_offset
,
5831 (o
->_cooked_size
!= 0
5838 if (! (_bfd_write_section_stabs
5839 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5840 o
, &elf_section_data (o
)->stab_info
, contents
)))
5848 /* Generate a reloc when linking an ELF file. This is a reloc
5849 requested by the linker, and does come from any input file. This
5850 is used to build constructor and destructor tables when linking
5854 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5856 struct bfd_link_info
*info
;
5857 asection
*output_section
;
5858 struct bfd_link_order
*link_order
;
5860 reloc_howto_type
*howto
;
5864 struct elf_link_hash_entry
**rel_hash_ptr
;
5865 Elf_Internal_Shdr
*rel_hdr
;
5866 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
5868 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5871 bfd_set_error (bfd_error_bad_value
);
5875 addend
= link_order
->u
.reloc
.p
->addend
;
5877 /* Figure out the symbol index. */
5878 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5879 + elf_section_data (output_section
)->rel_count
5880 + elf_section_data (output_section
)->rel_count2
);
5881 if (link_order
->type
== bfd_section_reloc_link_order
)
5883 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5884 BFD_ASSERT (indx
!= 0);
5885 *rel_hash_ptr
= NULL
;
5889 struct elf_link_hash_entry
*h
;
5891 /* Treat a reloc against a defined symbol as though it were
5892 actually against the section. */
5893 h
= ((struct elf_link_hash_entry
*)
5894 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5895 link_order
->u
.reloc
.p
->u
.name
,
5896 false, false, true));
5898 && (h
->root
.type
== bfd_link_hash_defined
5899 || h
->root
.type
== bfd_link_hash_defweak
))
5903 section
= h
->root
.u
.def
.section
;
5904 indx
= section
->output_section
->target_index
;
5905 *rel_hash_ptr
= NULL
;
5906 /* It seems that we ought to add the symbol value to the
5907 addend here, but in practice it has already been added
5908 because it was passed to constructor_callback. */
5909 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5913 /* Setting the index to -2 tells elf_link_output_extsym that
5914 this symbol is used by a reloc. */
5921 if (! ((*info
->callbacks
->unattached_reloc
)
5922 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5923 (asection
*) NULL
, (bfd_vma
) 0)))
5929 /* If this is an inplace reloc, we must write the addend into the
5931 if (howto
->partial_inplace
&& addend
!= 0)
5934 bfd_reloc_status_type rstat
;
5938 size
= bfd_get_reloc_size (howto
);
5939 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5940 if (buf
== (bfd_byte
*) NULL
)
5942 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5948 case bfd_reloc_outofrange
:
5950 case bfd_reloc_overflow
:
5951 if (! ((*info
->callbacks
->reloc_overflow
)
5953 (link_order
->type
== bfd_section_reloc_link_order
5954 ? bfd_section_name (output_bfd
,
5955 link_order
->u
.reloc
.p
->u
.section
)
5956 : link_order
->u
.reloc
.p
->u
.name
),
5957 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5965 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5966 (file_ptr
) link_order
->offset
, size
);
5972 /* The address of a reloc is relative to the section in a
5973 relocateable file, and is a virtual address in an executable
5975 offset
= link_order
->offset
;
5976 if (! info
->relocateable
)
5977 offset
+= output_section
->vma
;
5979 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5981 if (rel_hdr
->sh_type
== SHT_REL
)
5983 Elf_Internal_Rel irel
;
5984 Elf_External_Rel
*erel
;
5986 irel
.r_offset
= offset
;
5987 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5988 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5989 + elf_section_data (output_section
)->rel_count
);
5990 if (bed
->s
->swap_reloc_out
)
5991 (*bed
->s
->swap_reloc_out
) (output_bfd
, &irel
, (bfd_byte
*) erel
);
5993 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5997 Elf_Internal_Rela irela
;
5998 Elf_External_Rela
*erela
;
6000 irela
.r_offset
= offset
;
6001 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
6002 irela
.r_addend
= addend
;
6003 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
6004 + elf_section_data (output_section
)->rel_count
);
6005 if (bed
->s
->swap_reloca_out
)
6006 (*bed
->s
->swap_reloca_out
) (output_bfd
, &irela
, (bfd_byte
*) erela
);
6008 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
6011 ++elf_section_data (output_section
)->rel_count
;
6017 /* Allocate a pointer to live in a linker created section. */
6020 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
6022 struct bfd_link_info
*info
;
6023 elf_linker_section_t
*lsect
;
6024 struct elf_link_hash_entry
*h
;
6025 const Elf_Internal_Rela
*rel
;
6027 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
6028 elf_linker_section_pointers_t
*linker_section_ptr
;
6029 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
6031 BFD_ASSERT (lsect
!= NULL
);
6033 /* Is this a global symbol? */
6036 /* Has this symbol already been allocated, if so, our work is done */
6037 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
6042 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
6043 /* Make sure this symbol is output as a dynamic symbol. */
6044 if (h
->dynindx
== -1)
6046 if (! elf_link_record_dynamic_symbol (info
, h
))
6050 if (lsect
->rel_section
)
6051 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
6054 else /* Allocation of a pointer to a local symbol */
6056 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
6058 /* Allocate a table to hold the local symbols if first time */
6061 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6062 register unsigned int i
;
6064 ptr
= (elf_linker_section_pointers_t
**)
6065 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
6070 elf_local_ptr_offsets (abfd
) = ptr
;
6071 for (i
= 0; i
< num_symbols
; i
++)
6072 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
6075 /* Has this symbol already been allocated, if so, our work is done */
6076 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
6081 ptr_linker_section_ptr
= &ptr
[r_symndx
];
6085 /* If we are generating a shared object, we need to
6086 output a R_<xxx>_RELATIVE reloc so that the
6087 dynamic linker can adjust this GOT entry. */
6088 BFD_ASSERT (lsect
->rel_section
!= NULL
);
6089 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
6093 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
6094 from internal memory. */
6095 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
6096 linker_section_ptr
= (elf_linker_section_pointers_t
*)
6097 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
6099 if (!linker_section_ptr
)
6102 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
6103 linker_section_ptr
->addend
= rel
->r_addend
;
6104 linker_section_ptr
->which
= lsect
->which
;
6105 linker_section_ptr
->written_address_p
= false;
6106 *ptr_linker_section_ptr
= linker_section_ptr
;
6109 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
6111 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
6112 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
6113 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
6114 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
6116 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
6118 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
6119 lsect
->sym_hash
->root
.root
.string
,
6120 (long)ARCH_SIZE
/ 8,
6121 (long)lsect
->sym_hash
->root
.u
.def
.value
);
6127 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
6129 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
6132 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
6133 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
6141 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
6144 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
6147 /* Fill in the address for a pointer generated in alinker section. */
6150 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
6153 struct bfd_link_info
*info
;
6154 elf_linker_section_t
*lsect
;
6155 struct elf_link_hash_entry
*h
;
6157 const Elf_Internal_Rela
*rel
;
6160 elf_linker_section_pointers_t
*linker_section_ptr
;
6162 BFD_ASSERT (lsect
!= NULL
);
6164 if (h
!= NULL
) /* global symbol */
6166 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
6170 BFD_ASSERT (linker_section_ptr
!= NULL
);
6172 if (! elf_hash_table (info
)->dynamic_sections_created
6175 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
6177 /* This is actually a static link, or it is a
6178 -Bsymbolic link and the symbol is defined
6179 locally. We must initialize this entry in the
6182 When doing a dynamic link, we create a .rela.<xxx>
6183 relocation entry to initialize the value. This
6184 is done in the finish_dynamic_symbol routine. */
6185 if (!linker_section_ptr
->written_address_p
)
6187 linker_section_ptr
->written_address_p
= true;
6188 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6189 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6193 else /* local symbol */
6195 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6196 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
6197 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
6198 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
6202 BFD_ASSERT (linker_section_ptr
!= NULL
);
6204 /* Write out pointer if it hasn't been rewritten out before */
6205 if (!linker_section_ptr
->written_address_p
)
6207 linker_section_ptr
->written_address_p
= true;
6208 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6209 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6213 asection
*srel
= lsect
->rel_section
;
6214 Elf_Internal_Rela outrel
;
6216 /* We need to generate a relative reloc for the dynamic linker. */
6218 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
6221 BFD_ASSERT (srel
!= NULL
);
6223 outrel
.r_offset
= (lsect
->section
->output_section
->vma
6224 + lsect
->section
->output_offset
6225 + linker_section_ptr
->offset
);
6226 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
6227 outrel
.r_addend
= 0;
6228 elf_swap_reloca_out (output_bfd
, &outrel
,
6229 (((Elf_External_Rela
*)
6230 lsect
->section
->contents
)
6231 + elf_section_data (lsect
->section
)->rel_count
));
6232 ++elf_section_data (lsect
->section
)->rel_count
;
6237 relocation
= (lsect
->section
->output_offset
6238 + linker_section_ptr
->offset
6239 - lsect
->hole_offset
6240 - lsect
->sym_offset
);
6243 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6244 lsect
->name
, (long)relocation
, (long)relocation
);
6247 /* Subtract out the addend, because it will get added back in by the normal
6249 return relocation
- linker_section_ptr
->addend
;
6252 /* Garbage collect unused sections. */
6254 static boolean elf_gc_mark
6255 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
6256 asection
* (*gc_mark_hook
)
6257 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6258 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
6260 static boolean elf_gc_sweep
6261 PARAMS ((struct bfd_link_info
*info
,
6262 boolean (*gc_sweep_hook
)
6263 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6264 const Elf_Internal_Rela
*relocs
))));
6266 static boolean elf_gc_sweep_symbol
6267 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
6269 static boolean elf_gc_allocate_got_offsets
6270 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
6272 static boolean elf_gc_propagate_vtable_entries_used
6273 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6275 static boolean elf_gc_smash_unused_vtentry_relocs
6276 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6278 /* The mark phase of garbage collection. For a given section, mark
6279 it, and all the sections which define symbols to which it refers. */
6282 elf_gc_mark (info
, sec
, gc_mark_hook
)
6283 struct bfd_link_info
*info
;
6285 asection
* (*gc_mark_hook
)
6286 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6287 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
6293 /* Look through the section relocs. */
6295 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
6297 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
6298 Elf_Internal_Shdr
*symtab_hdr
;
6299 struct elf_link_hash_entry
**sym_hashes
;
6302 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
6303 bfd
*input_bfd
= sec
->owner
;
6304 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
6306 /* GCFIXME: how to arrange so that relocs and symbols are not
6307 reread continually? */
6309 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6310 sym_hashes
= elf_sym_hashes (input_bfd
);
6312 /* Read the local symbols. */
6313 if (elf_bad_symtab (input_bfd
))
6315 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6319 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
6320 if (symtab_hdr
->contents
)
6321 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6322 else if (nlocsyms
== 0)
6326 locsyms
= freesyms
=
6327 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
6328 if (freesyms
== NULL
6329 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6330 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
6331 nlocsyms
, input_bfd
)
6332 != nlocsyms
* sizeof (Elf_External_Sym
)))
6339 /* Read the relocations. */
6340 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6341 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
6342 info
->keep_memory
));
6343 if (relstart
== NULL
)
6348 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6350 for (rel
= relstart
; rel
< relend
; rel
++)
6352 unsigned long r_symndx
;
6354 struct elf_link_hash_entry
*h
;
6357 r_symndx
= ELF_R_SYM (rel
->r_info
);
6361 if (elf_bad_symtab (sec
->owner
))
6363 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6364 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
6365 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6368 h
= sym_hashes
[r_symndx
- extsymoff
];
6369 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6372 else if (r_symndx
>= nlocsyms
)
6374 h
= sym_hashes
[r_symndx
- extsymoff
];
6375 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6379 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6380 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6383 if (rsec
&& !rsec
->gc_mark
)
6384 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6392 if (!info
->keep_memory
)
6402 /* The sweep phase of garbage collection. Remove all garbage sections. */
6405 elf_gc_sweep (info
, gc_sweep_hook
)
6406 struct bfd_link_info
*info
;
6407 boolean (*gc_sweep_hook
)
6408 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6409 const Elf_Internal_Rela
*relocs
));
6413 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6417 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6420 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6422 /* Keep special sections. Keep .debug sections. */
6423 if ((o
->flags
& SEC_LINKER_CREATED
)
6424 || (o
->flags
& SEC_DEBUGGING
))
6430 /* Skip sweeping sections already excluded. */
6431 if (o
->flags
& SEC_EXCLUDE
)
6434 /* Since this is early in the link process, it is simple
6435 to remove a section from the output. */
6436 o
->flags
|= SEC_EXCLUDE
;
6438 /* But we also have to update some of the relocation
6439 info we collected before. */
6441 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6443 Elf_Internal_Rela
*internal_relocs
;
6446 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6447 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6448 if (internal_relocs
== NULL
)
6451 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6453 if (!info
->keep_memory
)
6454 free (internal_relocs
);
6462 /* Remove the symbols that were in the swept sections from the dynamic
6463 symbol table. GCFIXME: Anyone know how to get them out of the
6464 static symbol table as well? */
6468 elf_link_hash_traverse (elf_hash_table (info
),
6469 elf_gc_sweep_symbol
,
6472 elf_hash_table (info
)->dynsymcount
= i
;
6478 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6481 elf_gc_sweep_symbol (h
, idxptr
)
6482 struct elf_link_hash_entry
*h
;
6485 int *idx
= (int *) idxptr
;
6487 if (h
->dynindx
!= -1
6488 && ((h
->root
.type
!= bfd_link_hash_defined
6489 && h
->root
.type
!= bfd_link_hash_defweak
)
6490 || h
->root
.u
.def
.section
->gc_mark
))
6491 h
->dynindx
= (*idx
)++;
6496 /* Propogate collected vtable information. This is called through
6497 elf_link_hash_traverse. */
6500 elf_gc_propagate_vtable_entries_used (h
, okp
)
6501 struct elf_link_hash_entry
*h
;
6504 /* Those that are not vtables. */
6505 if (h
->vtable_parent
== NULL
)
6508 /* Those vtables that do not have parents, we cannot merge. */
6509 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6512 /* If we've already been done, exit. */
6513 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6516 /* Make sure the parent's table is up to date. */
6517 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6519 if (h
->vtable_entries_used
== NULL
)
6521 /* None of this table's entries were referenced. Re-use the
6523 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6524 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6531 /* Or the parent's entries into ours. */
6532 cu
= h
->vtable_entries_used
;
6534 pu
= h
->vtable_parent
->vtable_entries_used
;
6537 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6540 if (*pu
) *cu
= true;
6550 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6551 struct elf_link_hash_entry
*h
;
6555 bfd_vma hstart
, hend
;
6556 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6557 struct elf_backend_data
*bed
;
6559 /* Take care of both those symbols that do not describe vtables as
6560 well as those that are not loaded. */
6561 if (h
->vtable_parent
== NULL
)
6564 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6565 || h
->root
.type
== bfd_link_hash_defweak
);
6567 sec
= h
->root
.u
.def
.section
;
6568 hstart
= h
->root
.u
.def
.value
;
6569 hend
= hstart
+ h
->size
;
6571 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6572 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6574 return *(boolean
*)okp
= false;
6575 bed
= get_elf_backend_data (sec
->owner
);
6576 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6578 for (rel
= relstart
; rel
< relend
; ++rel
)
6579 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6581 /* If the entry is in use, do nothing. */
6582 if (h
->vtable_entries_used
6583 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6585 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6586 if (h
->vtable_entries_used
[entry
])
6589 /* Otherwise, kill it. */
6590 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6596 /* Do mark and sweep of unused sections. */
6599 elf_gc_sections (abfd
, info
)
6601 struct bfd_link_info
*info
;
6605 asection
* (*gc_mark_hook
)
6606 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6607 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6609 if (!get_elf_backend_data (abfd
)->can_gc_sections
6610 || info
->relocateable
|| info
->emitrelocations
6611 || elf_hash_table (info
)->dynamic_sections_created
)
6614 /* Apply transitive closure to the vtable entry usage info. */
6615 elf_link_hash_traverse (elf_hash_table (info
),
6616 elf_gc_propagate_vtable_entries_used
,
6621 /* Kill the vtable relocations that were not used. */
6622 elf_link_hash_traverse (elf_hash_table (info
),
6623 elf_gc_smash_unused_vtentry_relocs
,
6628 /* Grovel through relocs to find out who stays ... */
6630 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6631 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6635 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6638 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6640 if (o
->flags
& SEC_KEEP
)
6641 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6646 /* ... and mark SEC_EXCLUDE for those that go. */
6647 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6653 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6656 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6659 struct elf_link_hash_entry
*h
;
6662 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6663 struct elf_link_hash_entry
**search
, *child
;
6664 bfd_size_type extsymcount
;
6666 /* The sh_info field of the symtab header tells us where the
6667 external symbols start. We don't care about the local symbols at
6669 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6670 if (!elf_bad_symtab (abfd
))
6671 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6673 sym_hashes
= elf_sym_hashes (abfd
);
6674 sym_hashes_end
= sym_hashes
+ extsymcount
;
6676 /* Hunt down the child symbol, which is in this section at the same
6677 offset as the relocation. */
6678 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6680 if ((child
= *search
) != NULL
6681 && (child
->root
.type
== bfd_link_hash_defined
6682 || child
->root
.type
== bfd_link_hash_defweak
)
6683 && child
->root
.u
.def
.section
== sec
6684 && child
->root
.u
.def
.value
== offset
)
6688 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6689 bfd_get_filename (abfd
), sec
->name
,
6690 (unsigned long)offset
);
6691 bfd_set_error (bfd_error_invalid_operation
);
6697 /* This *should* only be the absolute section. It could potentially
6698 be that someone has defined a non-global vtable though, which
6699 would be bad. It isn't worth paging in the local symbols to be
6700 sure though; that case should simply be handled by the assembler. */
6702 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6705 child
->vtable_parent
= h
;
6710 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6713 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6714 bfd
*abfd ATTRIBUTE_UNUSED
;
6715 asection
*sec ATTRIBUTE_UNUSED
;
6716 struct elf_link_hash_entry
*h
;
6719 if (addend
>= h
->vtable_entries_size
)
6722 boolean
*ptr
= h
->vtable_entries_used
;
6724 /* While the symbol is undefined, we have to be prepared to handle
6726 if (h
->root
.type
== bfd_link_hash_undefined
)
6733 /* Oops! We've got a reference past the defined end of
6734 the table. This is probably a bug -- shall we warn? */
6739 /* Allocate one extra entry for use as a "done" flag for the
6740 consolidation pass. */
6741 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof (boolean
);
6745 ptr
= bfd_realloc (ptr
- 1, bytes
);
6751 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof (boolean
);
6752 memset (((char *)ptr
) + oldbytes
, 0, bytes
- oldbytes
);
6756 ptr
= bfd_zmalloc (bytes
);
6761 /* And arrange for that done flag to be at index -1. */
6762 h
->vtable_entries_used
= ptr
+ 1;
6763 h
->vtable_entries_size
= size
;
6766 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6771 /* And an accompanying bit to work out final got entry offsets once
6772 we're done. Should be called from final_link. */
6775 elf_gc_common_finalize_got_offsets (abfd
, info
)
6777 struct bfd_link_info
*info
;
6780 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6783 /* The GOT offset is relative to the .got section, but the GOT header is
6784 put into the .got.plt section, if the backend uses it. */
6785 if (bed
->want_got_plt
)
6788 gotoff
= bed
->got_header_size
;
6790 /* Do the local .got entries first. */
6791 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6793 bfd_signed_vma
*local_got
;
6794 bfd_size_type j
, locsymcount
;
6795 Elf_Internal_Shdr
*symtab_hdr
;
6797 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
6800 local_got
= elf_local_got_refcounts (i
);
6804 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6805 if (elf_bad_symtab (i
))
6806 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6808 locsymcount
= symtab_hdr
->sh_info
;
6810 for (j
= 0; j
< locsymcount
; ++j
)
6812 if (local_got
[j
] > 0)
6814 local_got
[j
] = gotoff
;
6815 gotoff
+= ARCH_SIZE
/ 8;
6818 local_got
[j
] = (bfd_vma
) -1;
6822 /* Then the global .got entries. .plt refcounts are handled by
6823 adjust_dynamic_symbol */
6824 elf_link_hash_traverse (elf_hash_table (info
),
6825 elf_gc_allocate_got_offsets
,
6830 /* We need a special top-level link routine to convert got reference counts
6831 to real got offsets. */
6834 elf_gc_allocate_got_offsets (h
, offarg
)
6835 struct elf_link_hash_entry
*h
;
6838 bfd_vma
*off
= (bfd_vma
*) offarg
;
6840 if (h
->got
.refcount
> 0)
6842 h
->got
.offset
= off
[0];
6843 off
[0] += ARCH_SIZE
/ 8;
6846 h
->got
.offset
= (bfd_vma
) -1;
6851 /* Many folk need no more in the way of final link than this, once
6852 got entry reference counting is enabled. */
6855 elf_gc_common_final_link (abfd
, info
)
6857 struct bfd_link_info
*info
;
6859 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6862 /* Invoke the regular ELF backend linker to do all the work. */
6863 return elf_bfd_final_link (abfd
, info
);
6866 /* This function will be called though elf_link_hash_traverse to store
6867 all hash value of the exported symbols in an array. */
6870 elf_collect_hash_codes (h
, data
)
6871 struct elf_link_hash_entry
*h
;
6874 unsigned long **valuep
= (unsigned long **) data
;
6880 /* Ignore indirect symbols. These are added by the versioning code. */
6881 if (h
->dynindx
== -1)
6884 name
= h
->root
.root
.string
;
6885 p
= strchr (name
, ELF_VER_CHR
);
6888 alc
= bfd_malloc (p
- name
+ 1);
6889 memcpy (alc
, name
, p
- name
);
6890 alc
[p
- name
] = '\0';
6894 /* Compute the hash value. */
6895 ha
= bfd_elf_hash (name
);
6897 /* Store the found hash value in the array given as the argument. */
6900 /* And store it in the struct so that we can put it in the hash table
6902 h
->elf_hash_value
= ha
;