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
;
1116 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
1120 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1121 (file_ptr
) 0, s
->_raw_size
))
1124 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1127 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1130 /* The shared libraries distributed with hpux11 have a bogus
1131 sh_link field for the ".dynamic" section. This code detects
1132 when LINK refers to a section that is not a string table and
1133 tries to find the string table for the ".dynsym" section
1135 Elf_Internal_Shdr
*hdr
= elf_elfsections (abfd
)[link
];
1136 if (hdr
->sh_type
!= SHT_STRTAB
)
1138 asection
*s
= bfd_get_section_by_name (abfd
, ".dynsym");
1139 int elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1142 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1147 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1148 for (; extdyn
< extdynend
; extdyn
++)
1150 Elf_Internal_Dyn dyn
;
1152 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1153 if (dyn
.d_tag
== DT_SONAME
)
1155 name
= bfd_elf_string_from_elf_section (abfd
, link
,
1160 if (dyn
.d_tag
== DT_NEEDED
)
1162 struct bfd_link_needed_list
*n
, **pn
;
1165 n
= ((struct bfd_link_needed_list
*)
1166 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1167 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1169 if (n
== NULL
|| fnm
== NULL
)
1171 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1178 for (pn
= &elf_hash_table (info
)->needed
;
1190 /* We do not want to include any of the sections in a dynamic
1191 object in the output file. We hack by simply clobbering the
1192 list of sections in the BFD. This could be handled more
1193 cleanly by, say, a new section flag; the existing
1194 SEC_NEVER_LOAD flag is not the one we want, because that one
1195 still implies that the section takes up space in the output
1197 abfd
->sections
= NULL
;
1198 abfd
->section_count
= 0;
1200 /* If this is the first dynamic object found in the link, create
1201 the special sections required for dynamic linking. */
1202 if (! elf_hash_table (info
)->dynamic_sections_created
)
1204 if (! elf_link_create_dynamic_sections (abfd
, info
))
1210 /* Add a DT_NEEDED entry for this dynamic object. */
1211 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1212 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1214 if (strindex
== (bfd_size_type
) -1)
1217 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1220 Elf_External_Dyn
*dyncon
, *dynconend
;
1222 /* The hash table size did not change, which means that
1223 the dynamic object name was already entered. If we
1224 have already included this dynamic object in the
1225 link, just ignore it. There is no reason to include
1226 a particular dynamic object more than once. */
1227 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1229 BFD_ASSERT (sdyn
!= NULL
);
1231 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1232 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1234 for (; dyncon
< dynconend
; dyncon
++)
1236 Elf_Internal_Dyn dyn
;
1238 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1240 if (dyn
.d_tag
== DT_NEEDED
1241 && dyn
.d_un
.d_val
== strindex
)
1245 if (extversym
!= NULL
)
1252 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1256 /* Save the SONAME, if there is one, because sometimes the
1257 linker emulation code will need to know it. */
1259 name
= bfd_get_filename (abfd
);
1260 elf_dt_name (abfd
) = name
;
1264 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1266 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1267 != extsymcount
* sizeof (Elf_External_Sym
)))
1272 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1273 esymend
= buf
+ extsymcount
;
1276 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1278 Elf_Internal_Sym sym
;
1284 struct elf_link_hash_entry
*h
;
1286 boolean size_change_ok
, type_change_ok
;
1287 boolean new_weakdef
;
1288 unsigned int old_alignment
;
1290 elf_swap_symbol_in (abfd
, esym
, &sym
);
1292 flags
= BSF_NO_FLAGS
;
1294 value
= sym
.st_value
;
1297 bind
= ELF_ST_BIND (sym
.st_info
);
1298 if (bind
== STB_LOCAL
)
1300 /* This should be impossible, since ELF requires that all
1301 global symbols follow all local symbols, and that sh_info
1302 point to the first global symbol. Unfortunatealy, Irix 5
1306 else if (bind
== STB_GLOBAL
)
1308 if (sym
.st_shndx
!= SHN_UNDEF
1309 && sym
.st_shndx
!= SHN_COMMON
)
1314 else if (bind
== STB_WEAK
)
1318 /* Leave it up to the processor backend. */
1321 if (sym
.st_shndx
== SHN_UNDEF
)
1322 sec
= bfd_und_section_ptr
;
1323 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1325 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1327 sec
= bfd_abs_section_ptr
;
1328 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1331 else if (sym
.st_shndx
== SHN_ABS
)
1332 sec
= bfd_abs_section_ptr
;
1333 else if (sym
.st_shndx
== SHN_COMMON
)
1335 sec
= bfd_com_section_ptr
;
1336 /* What ELF calls the size we call the value. What ELF
1337 calls the value we call the alignment. */
1338 value
= sym
.st_size
;
1342 /* Leave it up to the processor backend. */
1345 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1346 if (name
== (const char *) NULL
)
1349 if (add_symbol_hook
)
1351 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1355 /* The hook function sets the name to NULL if this symbol
1356 should be skipped for some reason. */
1357 if (name
== (const char *) NULL
)
1361 /* Sanity check that all possibilities were handled. */
1362 if (sec
== (asection
*) NULL
)
1364 bfd_set_error (bfd_error_bad_value
);
1368 if (bfd_is_und_section (sec
)
1369 || bfd_is_com_section (sec
))
1374 size_change_ok
= false;
1375 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1377 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1379 Elf_Internal_Versym iver
;
1380 unsigned int vernum
= 0;
1385 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1386 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1388 /* If this is a hidden symbol, or if it is not version
1389 1, we append the version name to the symbol name.
1390 However, we do not modify a non-hidden absolute
1391 symbol, because it might be the version symbol
1392 itself. FIXME: What if it isn't? */
1393 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1394 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1397 int namelen
, newlen
;
1400 if (sym
.st_shndx
!= SHN_UNDEF
)
1402 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1404 (*_bfd_error_handler
)
1405 (_("%s: %s: invalid version %u (max %d)"),
1406 bfd_get_filename (abfd
), name
, vernum
,
1407 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1408 bfd_set_error (bfd_error_bad_value
);
1411 else if (vernum
> 1)
1413 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1419 /* We cannot simply test for the number of
1420 entries in the VERNEED section since the
1421 numbers for the needed versions do not start
1423 Elf_Internal_Verneed
*t
;
1426 for (t
= elf_tdata (abfd
)->verref
;
1430 Elf_Internal_Vernaux
*a
;
1432 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1434 if (a
->vna_other
== vernum
)
1436 verstr
= a
->vna_nodename
;
1445 (*_bfd_error_handler
)
1446 (_("%s: %s: invalid needed version %d"),
1447 bfd_get_filename (abfd
), name
, vernum
);
1448 bfd_set_error (bfd_error_bad_value
);
1453 namelen
= strlen (name
);
1454 newlen
= namelen
+ strlen (verstr
) + 2;
1455 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1458 newname
= (char *) bfd_alloc (abfd
, newlen
);
1459 if (newname
== NULL
)
1461 strcpy (newname
, name
);
1462 p
= newname
+ namelen
;
1464 /* If this is a defined non-hidden version symbol,
1465 we add another @ to the name. This indicates the
1466 default version of the symbol. */
1467 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1468 && sym
.st_shndx
!= SHN_UNDEF
)
1476 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1477 sym_hash
, &override
, &type_change_ok
,
1478 &size_change_ok
, dt_needed
))
1485 while (h
->root
.type
== bfd_link_hash_indirect
1486 || h
->root
.type
== bfd_link_hash_warning
)
1487 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1489 /* Remember the old alignment if this is a common symbol, so
1490 that we don't reduce the alignment later on. We can't
1491 check later, because _bfd_generic_link_add_one_symbol
1492 will set a default for the alignment which we want to
1494 if (h
->root
.type
== bfd_link_hash_common
)
1495 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1497 if (elf_tdata (abfd
)->verdef
!= NULL
1501 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1504 if (! (_bfd_generic_link_add_one_symbol
1505 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1506 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1510 while (h
->root
.type
== bfd_link_hash_indirect
1511 || h
->root
.type
== bfd_link_hash_warning
)
1512 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1515 new_weakdef
= false;
1518 && (flags
& BSF_WEAK
) != 0
1519 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1520 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1521 && h
->weakdef
== NULL
)
1523 /* Keep a list of all weak defined non function symbols from
1524 a dynamic object, using the weakdef field. Later in this
1525 function we will set the weakdef field to the correct
1526 value. We only put non-function symbols from dynamic
1527 objects on this list, because that happens to be the only
1528 time we need to know the normal symbol corresponding to a
1529 weak symbol, and the information is time consuming to
1530 figure out. If the weakdef field is not already NULL,
1531 then this symbol was already defined by some previous
1532 dynamic object, and we will be using that previous
1533 definition anyhow. */
1540 /* Set the alignment of a common symbol. */
1541 if (sym
.st_shndx
== SHN_COMMON
1542 && h
->root
.type
== bfd_link_hash_common
)
1546 align
= bfd_log2 (sym
.st_value
);
1547 if (align
> old_alignment
)
1548 h
->root
.u
.c
.p
->alignment_power
= align
;
1551 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1557 /* Remember the symbol size and type. */
1558 if (sym
.st_size
!= 0
1559 && (definition
|| h
->size
== 0))
1561 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1562 (*_bfd_error_handler
)
1563 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1564 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1565 bfd_get_filename (abfd
));
1567 h
->size
= sym
.st_size
;
1570 /* If this is a common symbol, then we always want H->SIZE
1571 to be the size of the common symbol. The code just above
1572 won't fix the size if a common symbol becomes larger. We
1573 don't warn about a size change here, because that is
1574 covered by --warn-common. */
1575 if (h
->root
.type
== bfd_link_hash_common
)
1576 h
->size
= h
->root
.u
.c
.size
;
1578 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1579 && (definition
|| h
->type
== STT_NOTYPE
))
1581 if (h
->type
!= STT_NOTYPE
1582 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1583 && ! type_change_ok
)
1584 (*_bfd_error_handler
)
1585 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1586 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1587 bfd_get_filename (abfd
));
1589 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1592 /* If st_other has a processor-specific meaning, specific code
1593 might be needed here. */
1594 if (sym
.st_other
!= 0)
1596 /* Combine visibilities, using the most constraining one. */
1597 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1598 unsigned char symvis
= ELF_ST_VISIBILITY (sym
.st_other
);
1600 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1601 h
->other
= sym
.st_other
;
1603 /* If neither has visibility, use the st_other of the
1604 definition. This is an arbitrary choice, since the
1605 other bits have no general meaning. */
1606 if (!symvis
&& !hvis
1607 && (definition
|| h
->other
== 0))
1608 h
->other
= sym
.st_other
;
1611 /* Set a flag in the hash table entry indicating the type of
1612 reference or definition we just found. Keep a count of
1613 the number of dynamic symbols we find. A dynamic symbol
1614 is one which is referenced or defined by both a regular
1615 object and a shared object. */
1616 old_flags
= h
->elf_link_hash_flags
;
1622 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1623 if (bind
!= STB_WEAK
)
1624 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1627 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1629 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1630 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1636 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1638 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1639 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1640 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1641 || (h
->weakdef
!= NULL
1643 && h
->weakdef
->dynindx
!= -1))
1647 h
->elf_link_hash_flags
|= new_flag
;
1649 /* If this symbol has a version, and it is the default
1650 version, we create an indirect symbol from the default
1651 name to the fully decorated name. This will cause
1652 external references which do not specify a version to be
1653 bound to this version of the symbol. */
1658 p
= strchr (name
, ELF_VER_CHR
);
1659 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1662 struct elf_link_hash_entry
*hi
;
1665 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1667 if (shortname
== NULL
)
1669 strncpy (shortname
, name
, p
- name
);
1670 shortname
[p
- name
] = '\0';
1672 /* We are going to create a new symbol. Merge it
1673 with any existing symbol with this name. For the
1674 purposes of the merge, act as though we were
1675 defining the symbol we just defined, although we
1676 actually going to define an indirect symbol. */
1677 type_change_ok
= false;
1678 size_change_ok
= false;
1679 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1680 &value
, &hi
, &override
,
1682 &size_change_ok
, dt_needed
))
1687 if (! (_bfd_generic_link_add_one_symbol
1688 (info
, abfd
, shortname
, BSF_INDIRECT
,
1689 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1690 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1695 /* In this case the symbol named SHORTNAME is
1696 overriding the indirect symbol we want to
1697 add. We were planning on making SHORTNAME an
1698 indirect symbol referring to NAME. SHORTNAME
1699 is the name without a version. NAME is the
1700 fully versioned name, and it is the default
1703 Overriding means that we already saw a
1704 definition for the symbol SHORTNAME in a
1705 regular object, and it is overriding the
1706 symbol defined in the dynamic object.
1708 When this happens, we actually want to change
1709 NAME, the symbol we just added, to refer to
1710 SHORTNAME. This will cause references to
1711 NAME in the shared object to become
1712 references to SHORTNAME in the regular
1713 object. This is what we expect when we
1714 override a function in a shared object: that
1715 the references in the shared object will be
1716 mapped to the definition in the regular
1719 while (hi
->root
.type
== bfd_link_hash_indirect
1720 || hi
->root
.type
== bfd_link_hash_warning
)
1721 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1723 h
->root
.type
= bfd_link_hash_indirect
;
1724 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1725 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1727 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1728 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1729 if (hi
->elf_link_hash_flags
1730 & (ELF_LINK_HASH_REF_REGULAR
1731 | ELF_LINK_HASH_DEF_REGULAR
))
1733 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1739 /* Now set HI to H, so that the following code
1740 will set the other fields correctly. */
1744 /* If there is a duplicate definition somewhere,
1745 then HI may not point to an indirect symbol. We
1746 will have reported an error to the user in that
1749 if (hi
->root
.type
== bfd_link_hash_indirect
)
1751 struct elf_link_hash_entry
*ht
;
1753 /* If the symbol became indirect, then we assume
1754 that we have not seen a definition before. */
1755 BFD_ASSERT ((hi
->elf_link_hash_flags
1756 & (ELF_LINK_HASH_DEF_DYNAMIC
1757 | ELF_LINK_HASH_DEF_REGULAR
))
1760 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1761 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1763 /* See if the new flags lead us to realize that
1764 the symbol must be dynamic. */
1770 || ((hi
->elf_link_hash_flags
1771 & ELF_LINK_HASH_REF_DYNAMIC
)
1777 if ((hi
->elf_link_hash_flags
1778 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1784 /* We also need to define an indirection from the
1785 nondefault version of the symbol. */
1787 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1789 if (shortname
== NULL
)
1791 strncpy (shortname
, name
, p
- name
);
1792 strcpy (shortname
+ (p
- name
), p
+ 1);
1794 /* Once again, merge with any existing symbol. */
1795 type_change_ok
= false;
1796 size_change_ok
= false;
1797 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1798 &value
, &hi
, &override
,
1800 &size_change_ok
, dt_needed
))
1805 /* Here SHORTNAME is a versioned name, so we
1806 don't expect to see the type of override we
1807 do in the case above. */
1808 (*_bfd_error_handler
)
1809 (_("%s: warning: unexpected redefinition of `%s'"),
1810 bfd_get_filename (abfd
), shortname
);
1814 if (! (_bfd_generic_link_add_one_symbol
1815 (info
, abfd
, shortname
, BSF_INDIRECT
,
1816 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1817 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1820 /* If there is a duplicate definition somewhere,
1821 then HI may not point to an indirect symbol.
1822 We will have reported an error to the user in
1825 if (hi
->root
.type
== bfd_link_hash_indirect
)
1827 /* If the symbol became indirect, then we
1828 assume that we have not seen a definition
1830 BFD_ASSERT ((hi
->elf_link_hash_flags
1831 & (ELF_LINK_HASH_DEF_DYNAMIC
1832 | ELF_LINK_HASH_DEF_REGULAR
))
1835 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1837 /* See if the new flags lead us to realize
1838 that the symbol must be dynamic. */
1844 || ((hi
->elf_link_hash_flags
1845 & ELF_LINK_HASH_REF_DYNAMIC
)
1851 if ((hi
->elf_link_hash_flags
1852 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1861 if (dynsym
&& h
->dynindx
== -1)
1863 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1865 if (h
->weakdef
!= NULL
1867 && h
->weakdef
->dynindx
== -1)
1869 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1874 else if (dynsym
&& h
->dynindx
!= -1)
1875 /* If the symbol already has a dynamic index, but
1876 visibility says it should not be visible, turn it into
1878 switch (ELF_ST_VISIBILITY (h
->other
))
1882 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
1883 (*bed
->elf_backend_hide_symbol
) (info
, h
);
1887 if (dt_needed
&& definition
1888 && (h
->elf_link_hash_flags
1889 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1891 bfd_size_type oldsize
;
1892 bfd_size_type strindex
;
1894 /* The symbol from a DT_NEEDED object is referenced from
1895 the regular object to create a dynamic executable. We
1896 have to make sure there is a DT_NEEDED entry for it. */
1899 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1900 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
1901 elf_dt_soname (abfd
),
1903 if (strindex
== (bfd_size_type
) -1)
1907 == _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1910 Elf_External_Dyn
*dyncon
, *dynconend
;
1912 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1914 BFD_ASSERT (sdyn
!= NULL
);
1916 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1917 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1919 for (; dyncon
< dynconend
; dyncon
++)
1921 Elf_Internal_Dyn dyn
;
1923 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
,
1925 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
1926 dyn
.d_un
.d_val
!= strindex
);
1930 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1936 /* Now set the weakdefs field correctly for all the weak defined
1937 symbols we found. The only way to do this is to search all the
1938 symbols. Since we only need the information for non functions in
1939 dynamic objects, that's the only time we actually put anything on
1940 the list WEAKS. We need this information so that if a regular
1941 object refers to a symbol defined weakly in a dynamic object, the
1942 real symbol in the dynamic object is also put in the dynamic
1943 symbols; we also must arrange for both symbols to point to the
1944 same memory location. We could handle the general case of symbol
1945 aliasing, but a general symbol alias can only be generated in
1946 assembler code, handling it correctly would be very time
1947 consuming, and other ELF linkers don't handle general aliasing
1949 while (weaks
!= NULL
)
1951 struct elf_link_hash_entry
*hlook
;
1954 struct elf_link_hash_entry
**hpp
;
1955 struct elf_link_hash_entry
**hppend
;
1958 weaks
= hlook
->weakdef
;
1959 hlook
->weakdef
= NULL
;
1961 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1962 || hlook
->root
.type
== bfd_link_hash_defweak
1963 || hlook
->root
.type
== bfd_link_hash_common
1964 || hlook
->root
.type
== bfd_link_hash_indirect
);
1965 slook
= hlook
->root
.u
.def
.section
;
1966 vlook
= hlook
->root
.u
.def
.value
;
1968 hpp
= elf_sym_hashes (abfd
);
1969 hppend
= hpp
+ extsymcount
;
1970 for (; hpp
< hppend
; hpp
++)
1972 struct elf_link_hash_entry
*h
;
1975 if (h
!= NULL
&& h
!= hlook
1976 && h
->root
.type
== bfd_link_hash_defined
1977 && h
->root
.u
.def
.section
== slook
1978 && h
->root
.u
.def
.value
== vlook
)
1982 /* If the weak definition is in the list of dynamic
1983 symbols, make sure the real definition is put there
1985 if (hlook
->dynindx
!= -1
1986 && h
->dynindx
== -1)
1988 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1992 /* If the real definition is in the list of dynamic
1993 symbols, make sure the weak definition is put there
1994 as well. If we don't do this, then the dynamic
1995 loader might not merge the entries for the real
1996 definition and the weak definition. */
1997 if (h
->dynindx
!= -1
1998 && hlook
->dynindx
== -1)
2000 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2015 if (extversym
!= NULL
)
2021 /* If this object is the same format as the output object, and it is
2022 not a shared library, then let the backend look through the
2025 This is required to build global offset table entries and to
2026 arrange for dynamic relocs. It is not required for the
2027 particular common case of linking non PIC code, even when linking
2028 against shared libraries, but unfortunately there is no way of
2029 knowing whether an object file has been compiled PIC or not.
2030 Looking through the relocs is not particularly time consuming.
2031 The problem is that we must either (1) keep the relocs in memory,
2032 which causes the linker to require additional runtime memory or
2033 (2) read the relocs twice from the input file, which wastes time.
2034 This would be a good case for using mmap.
2036 I have no idea how to handle linking PIC code into a file of a
2037 different format. It probably can't be done. */
2038 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2040 && abfd
->xvec
== info
->hash
->creator
2041 && check_relocs
!= NULL
)
2045 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2047 Elf_Internal_Rela
*internal_relocs
;
2050 if ((o
->flags
& SEC_RELOC
) == 0
2051 || o
->reloc_count
== 0
2052 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2053 && (o
->flags
& SEC_DEBUGGING
) != 0)
2054 || bfd_is_abs_section (o
->output_section
))
2057 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2058 (abfd
, o
, (PTR
) NULL
,
2059 (Elf_Internal_Rela
*) NULL
,
2060 info
->keep_memory
));
2061 if (internal_relocs
== NULL
)
2064 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2066 if (! info
->keep_memory
)
2067 free (internal_relocs
);
2074 /* If this is a non-traditional, non-relocateable link, try to
2075 optimize the handling of the .stab/.stabstr sections. */
2077 && ! info
->relocateable
2078 && ! info
->traditional_format
2079 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2080 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2082 asection
*stab
, *stabstr
;
2084 stab
= bfd_get_section_by_name (abfd
, ".stab");
2087 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2089 if (stabstr
!= NULL
)
2091 struct bfd_elf_section_data
*secdata
;
2093 secdata
= elf_section_data (stab
);
2094 if (! _bfd_link_section_stabs (abfd
,
2095 &elf_hash_table (info
)->stab_info
,
2097 &secdata
->stab_info
))
2112 if (extversym
!= NULL
)
2117 /* Create some sections which will be filled in with dynamic linking
2118 information. ABFD is an input file which requires dynamic sections
2119 to be created. The dynamic sections take up virtual memory space
2120 when the final executable is run, so we need to create them before
2121 addresses are assigned to the output sections. We work out the
2122 actual contents and size of these sections later. */
2125 elf_link_create_dynamic_sections (abfd
, info
)
2127 struct bfd_link_info
*info
;
2130 register asection
*s
;
2131 struct elf_link_hash_entry
*h
;
2132 struct elf_backend_data
*bed
;
2134 if (elf_hash_table (info
)->dynamic_sections_created
)
2137 /* Make sure that all dynamic sections use the same input BFD. */
2138 if (elf_hash_table (info
)->dynobj
== NULL
)
2139 elf_hash_table (info
)->dynobj
= abfd
;
2141 abfd
= elf_hash_table (info
)->dynobj
;
2143 /* Note that we set the SEC_IN_MEMORY flag for all of these
2145 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2146 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2148 /* A dynamically linked executable has a .interp section, but a
2149 shared library does not. */
2152 s
= bfd_make_section (abfd
, ".interp");
2154 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2158 /* Create sections to hold version informations. These are removed
2159 if they are not needed. */
2160 s
= bfd_make_section (abfd
, ".gnu.version_d");
2162 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2163 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2166 s
= bfd_make_section (abfd
, ".gnu.version");
2168 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2169 || ! bfd_set_section_alignment (abfd
, s
, 1))
2172 s
= bfd_make_section (abfd
, ".gnu.version_r");
2174 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2175 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2178 s
= bfd_make_section (abfd
, ".dynsym");
2180 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2181 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2184 s
= bfd_make_section (abfd
, ".dynstr");
2186 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2189 /* Create a strtab to hold the dynamic symbol names. */
2190 if (elf_hash_table (info
)->dynstr
== NULL
)
2192 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
2193 if (elf_hash_table (info
)->dynstr
== NULL
)
2197 s
= bfd_make_section (abfd
, ".dynamic");
2199 || ! bfd_set_section_flags (abfd
, s
, flags
)
2200 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2203 /* The special symbol _DYNAMIC is always set to the start of the
2204 .dynamic section. This call occurs before we have processed the
2205 symbols for any dynamic object, so we don't have to worry about
2206 overriding a dynamic definition. We could set _DYNAMIC in a
2207 linker script, but we only want to define it if we are, in fact,
2208 creating a .dynamic section. We don't want to define it if there
2209 is no .dynamic section, since on some ELF platforms the start up
2210 code examines it to decide how to initialize the process. */
2212 if (! (_bfd_generic_link_add_one_symbol
2213 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2214 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2215 (struct bfd_link_hash_entry
**) &h
)))
2217 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2218 h
->type
= STT_OBJECT
;
2221 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2224 bed
= get_elf_backend_data (abfd
);
2226 s
= bfd_make_section (abfd
, ".hash");
2228 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2229 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2231 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2233 /* Let the backend create the rest of the sections. This lets the
2234 backend set the right flags. The backend will normally create
2235 the .got and .plt sections. */
2236 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2239 elf_hash_table (info
)->dynamic_sections_created
= true;
2244 /* Add an entry to the .dynamic table. */
2247 elf_add_dynamic_entry (info
, tag
, val
)
2248 struct bfd_link_info
*info
;
2252 Elf_Internal_Dyn dyn
;
2256 bfd_byte
*newcontents
;
2258 dynobj
= elf_hash_table (info
)->dynobj
;
2260 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2261 BFD_ASSERT (s
!= NULL
);
2263 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2264 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2265 if (newcontents
== NULL
)
2269 dyn
.d_un
.d_val
= val
;
2270 elf_swap_dyn_out (dynobj
, &dyn
,
2271 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2273 s
->_raw_size
= newsize
;
2274 s
->contents
= newcontents
;
2279 /* Record a new local dynamic symbol. */
2282 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2283 struct bfd_link_info
*info
;
2287 struct elf_link_local_dynamic_entry
*entry
;
2288 struct elf_link_hash_table
*eht
;
2289 struct bfd_strtab_hash
*dynstr
;
2290 Elf_External_Sym esym
;
2291 unsigned long dynstr_index
;
2294 /* See if the entry exists already. */
2295 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2296 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2299 entry
= (struct elf_link_local_dynamic_entry
*)
2300 bfd_alloc (input_bfd
, sizeof (*entry
));
2304 /* Go find the symbol, so that we can find it's name. */
2305 if (bfd_seek (input_bfd
,
2306 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2307 + input_indx
* sizeof (Elf_External_Sym
)),
2309 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2310 != sizeof (Elf_External_Sym
)))
2312 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2314 name
= (bfd_elf_string_from_elf_section
2315 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2316 entry
->isym
.st_name
));
2318 dynstr
= elf_hash_table (info
)->dynstr
;
2321 /* Create a strtab to hold the dynamic symbol names. */
2322 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2327 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2328 if (dynstr_index
== (unsigned long) -1)
2330 entry
->isym
.st_name
= dynstr_index
;
2332 eht
= elf_hash_table (info
);
2334 entry
->next
= eht
->dynlocal
;
2335 eht
->dynlocal
= entry
;
2336 entry
->input_bfd
= input_bfd
;
2337 entry
->input_indx
= input_indx
;
2340 /* Whatever binding the symbol had before, it's now local. */
2342 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2344 /* The dynindx will be set at the end of size_dynamic_sections. */
2350 /* Read and swap the relocs from the section indicated by SHDR. This
2351 may be either a REL or a RELA section. The relocations are
2352 translated into RELA relocations and stored in INTERNAL_RELOCS,
2353 which should have already been allocated to contain enough space.
2354 The EXTERNAL_RELOCS are a buffer where the external form of the
2355 relocations should be stored.
2357 Returns false if something goes wrong. */
2360 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2363 Elf_Internal_Shdr
*shdr
;
2364 PTR external_relocs
;
2365 Elf_Internal_Rela
*internal_relocs
;
2367 struct elf_backend_data
*bed
;
2369 /* If there aren't any relocations, that's OK. */
2373 /* Position ourselves at the start of the section. */
2374 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2377 /* Read the relocations. */
2378 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2382 bed
= get_elf_backend_data (abfd
);
2384 /* Convert the external relocations to the internal format. */
2385 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2387 Elf_External_Rel
*erel
;
2388 Elf_External_Rel
*erelend
;
2389 Elf_Internal_Rela
*irela
;
2390 Elf_Internal_Rel
*irel
;
2392 erel
= (Elf_External_Rel
*) external_relocs
;
2393 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2394 irela
= internal_relocs
;
2395 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2396 * sizeof (Elf_Internal_Rel
)));
2397 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2401 if (bed
->s
->swap_reloc_in
)
2402 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2404 elf_swap_reloc_in (abfd
, erel
, irel
);
2406 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2408 irela
[i
].r_offset
= irel
[i
].r_offset
;
2409 irela
[i
].r_info
= irel
[i
].r_info
;
2410 irela
[i
].r_addend
= 0;
2416 Elf_External_Rela
*erela
;
2417 Elf_External_Rela
*erelaend
;
2418 Elf_Internal_Rela
*irela
;
2420 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2422 erela
= (Elf_External_Rela
*) external_relocs
;
2423 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2424 irela
= internal_relocs
;
2425 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2427 if (bed
->s
->swap_reloca_in
)
2428 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2430 elf_swap_reloca_in (abfd
, erela
, irela
);
2437 /* Read and swap the relocs for a section O. They may have been
2438 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2439 not NULL, they are used as buffers to read into. They are known to
2440 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2441 the return value is allocated using either malloc or bfd_alloc,
2442 according to the KEEP_MEMORY argument. If O has two relocation
2443 sections (both REL and RELA relocations), then the REL_HDR
2444 relocations will appear first in INTERNAL_RELOCS, followed by the
2445 REL_HDR2 relocations. */
2448 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2452 PTR external_relocs
;
2453 Elf_Internal_Rela
*internal_relocs
;
2454 boolean keep_memory
;
2456 Elf_Internal_Shdr
*rel_hdr
;
2458 Elf_Internal_Rela
*alloc2
= NULL
;
2459 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2461 if (elf_section_data (o
)->relocs
!= NULL
)
2462 return elf_section_data (o
)->relocs
;
2464 if (o
->reloc_count
== 0)
2467 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2469 if (internal_relocs
== NULL
)
2473 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2474 * sizeof (Elf_Internal_Rela
));
2476 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2478 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2479 if (internal_relocs
== NULL
)
2483 if (external_relocs
== NULL
)
2485 size_t size
= (size_t) rel_hdr
->sh_size
;
2487 if (elf_section_data (o
)->rel_hdr2
)
2488 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2489 alloc1
= (PTR
) bfd_malloc (size
);
2492 external_relocs
= alloc1
;
2495 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2499 if (!elf_link_read_relocs_from_section
2501 elf_section_data (o
)->rel_hdr2
,
2502 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2503 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2504 * bed
->s
->int_rels_per_ext_rel
)))
2507 /* Cache the results for next time, if we can. */
2509 elf_section_data (o
)->relocs
= internal_relocs
;
2514 /* Don't free alloc2, since if it was allocated we are passing it
2515 back (under the name of internal_relocs). */
2517 return internal_relocs
;
2528 /* Record an assignment to a symbol made by a linker script. We need
2529 this in case some dynamic object refers to this symbol. */
2533 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2534 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2535 struct bfd_link_info
*info
;
2539 struct elf_link_hash_entry
*h
;
2541 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2544 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2548 if (h
->root
.type
== bfd_link_hash_new
)
2549 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2551 /* If this symbol is being provided by the linker script, and it is
2552 currently defined by a dynamic object, but not by a regular
2553 object, then mark it as undefined so that the generic linker will
2554 force the correct value. */
2556 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2557 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2558 h
->root
.type
= bfd_link_hash_undefined
;
2560 /* If this symbol is not being provided by the linker script, and it is
2561 currently defined by a dynamic object, but not by a regular object,
2562 then clear out any version information because the symbol will not be
2563 associated with the dynamic object any more. */
2565 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2566 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2567 h
->verinfo
.verdef
= NULL
;
2569 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2571 /* When possible, keep the original type of the symbol */
2572 if (h
->type
== STT_NOTYPE
)
2573 h
->type
= STT_OBJECT
;
2575 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2576 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2578 && h
->dynindx
== -1)
2580 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2583 /* If this is a weak defined symbol, and we know a corresponding
2584 real symbol from the same dynamic object, make sure the real
2585 symbol is also made into a dynamic symbol. */
2586 if (h
->weakdef
!= NULL
2587 && h
->weakdef
->dynindx
== -1)
2589 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2597 /* This structure is used to pass information to
2598 elf_link_assign_sym_version. */
2600 struct elf_assign_sym_version_info
2604 /* General link information. */
2605 struct bfd_link_info
*info
;
2607 struct bfd_elf_version_tree
*verdefs
;
2608 /* Whether we are exporting all dynamic symbols. */
2609 boolean export_dynamic
;
2610 /* Whether we had a failure. */
2614 /* This structure is used to pass information to
2615 elf_link_find_version_dependencies. */
2617 struct elf_find_verdep_info
2621 /* General link information. */
2622 struct bfd_link_info
*info
;
2623 /* The number of dependencies. */
2625 /* Whether we had a failure. */
2629 /* Array used to determine the number of hash table buckets to use
2630 based on the number of symbols there are. If there are fewer than
2631 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2632 fewer than 37 we use 17 buckets, and so forth. We never use more
2633 than 32771 buckets. */
2635 static const size_t elf_buckets
[] =
2637 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2641 /* Compute bucket count for hashing table. We do not use a static set
2642 of possible tables sizes anymore. Instead we determine for all
2643 possible reasonable sizes of the table the outcome (i.e., the
2644 number of collisions etc) and choose the best solution. The
2645 weighting functions are not too simple to allow the table to grow
2646 without bounds. Instead one of the weighting factors is the size.
2647 Therefore the result is always a good payoff between few collisions
2648 (= short chain lengths) and table size. */
2650 compute_bucket_count (info
)
2651 struct bfd_link_info
*info
;
2653 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2654 size_t best_size
= 0;
2655 unsigned long int *hashcodes
;
2656 unsigned long int *hashcodesp
;
2657 unsigned long int i
;
2659 /* Compute the hash values for all exported symbols. At the same
2660 time store the values in an array so that we could use them for
2662 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2663 * sizeof (unsigned long int));
2664 if (hashcodes
== NULL
)
2666 hashcodesp
= hashcodes
;
2668 /* Put all hash values in HASHCODES. */
2669 elf_link_hash_traverse (elf_hash_table (info
),
2670 elf_collect_hash_codes
, &hashcodesp
);
2672 /* We have a problem here. The following code to optimize the table
2673 size requires an integer type with more the 32 bits. If
2674 BFD_HOST_U_64_BIT is set we know about such a type. */
2675 #ifdef BFD_HOST_U_64_BIT
2676 if (info
->optimize
== true)
2678 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2681 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2682 unsigned long int *counts
;
2684 /* Possible optimization parameters: if we have NSYMS symbols we say
2685 that the hashing table must at least have NSYMS/4 and at most
2687 minsize
= nsyms
/ 4;
2690 best_size
= maxsize
= nsyms
* 2;
2692 /* Create array where we count the collisions in. We must use bfd_malloc
2693 since the size could be large. */
2694 counts
= (unsigned long int *) bfd_malloc (maxsize
2695 * sizeof (unsigned long int));
2702 /* Compute the "optimal" size for the hash table. The criteria is a
2703 minimal chain length. The minor criteria is (of course) the size
2705 for (i
= minsize
; i
< maxsize
; ++i
)
2707 /* Walk through the array of hashcodes and count the collisions. */
2708 BFD_HOST_U_64_BIT max
;
2709 unsigned long int j
;
2710 unsigned long int fact
;
2712 memset (counts
, '\0', i
* sizeof (unsigned long int));
2714 /* Determine how often each hash bucket is used. */
2715 for (j
= 0; j
< nsyms
; ++j
)
2716 ++counts
[hashcodes
[j
] % i
];
2718 /* For the weight function we need some information about the
2719 pagesize on the target. This is information need not be 100%
2720 accurate. Since this information is not available (so far) we
2721 define it here to a reasonable default value. If it is crucial
2722 to have a better value some day simply define this value. */
2723 # ifndef BFD_TARGET_PAGESIZE
2724 # define BFD_TARGET_PAGESIZE (4096)
2727 /* We in any case need 2 + NSYMS entries for the size values and
2729 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2732 /* Variant 1: optimize for short chains. We add the squares
2733 of all the chain lengths (which favous many small chain
2734 over a few long chains). */
2735 for (j
= 0; j
< i
; ++j
)
2736 max
+= counts
[j
] * counts
[j
];
2738 /* This adds penalties for the overall size of the table. */
2739 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2742 /* Variant 2: Optimize a lot more for small table. Here we
2743 also add squares of the size but we also add penalties for
2744 empty slots (the +1 term). */
2745 for (j
= 0; j
< i
; ++j
)
2746 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2748 /* The overall size of the table is considered, but not as
2749 strong as in variant 1, where it is squared. */
2750 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2754 /* Compare with current best results. */
2755 if (max
< best_chlen
)
2765 #endif /* defined (BFD_HOST_U_64_BIT) */
2767 /* This is the fallback solution if no 64bit type is available or if we
2768 are not supposed to spend much time on optimizations. We select the
2769 bucket count using a fixed set of numbers. */
2770 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2772 best_size
= elf_buckets
[i
];
2773 if (dynsymcount
< elf_buckets
[i
+ 1])
2778 /* Free the arrays we needed. */
2784 /* Set up the sizes and contents of the ELF dynamic sections. This is
2785 called by the ELF linker emulation before_allocation routine. We
2786 must set the sizes of the sections before the linker sets the
2787 addresses of the various sections. */
2790 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2791 export_dynamic
, filter_shlib
,
2792 auxiliary_filters
, info
, sinterpptr
,
2797 boolean export_dynamic
;
2798 const char *filter_shlib
;
2799 const char * const *auxiliary_filters
;
2800 struct bfd_link_info
*info
;
2801 asection
**sinterpptr
;
2802 struct bfd_elf_version_tree
*verdefs
;
2804 bfd_size_type soname_indx
;
2806 struct elf_backend_data
*bed
;
2807 struct elf_assign_sym_version_info asvinfo
;
2811 soname_indx
= (bfd_size_type
) -1;
2813 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2816 /* The backend may have to create some sections regardless of whether
2817 we're dynamic or not. */
2818 bed
= get_elf_backend_data (output_bfd
);
2819 if (bed
->elf_backend_always_size_sections
2820 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2823 dynobj
= elf_hash_table (info
)->dynobj
;
2825 /* If there were no dynamic objects in the link, there is nothing to
2830 if (elf_hash_table (info
)->dynamic_sections_created
)
2832 struct elf_info_failed eif
;
2833 struct elf_link_hash_entry
*h
;
2834 bfd_size_type strsize
;
2836 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2837 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2841 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2842 soname
, true, true);
2843 if (soname_indx
== (bfd_size_type
) -1
2844 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2850 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2852 info
->flags
|= DF_SYMBOLIC
;
2859 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2861 if (indx
== (bfd_size_type
) -1
2862 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
)
2864 && ! elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
)))
2868 if (filter_shlib
!= NULL
)
2872 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2873 filter_shlib
, true, true);
2874 if (indx
== (bfd_size_type
) -1
2875 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2879 if (auxiliary_filters
!= NULL
)
2881 const char * const *p
;
2883 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2887 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2889 if (indx
== (bfd_size_type
) -1
2890 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2895 /* If we are supposed to export all symbols into the dynamic symbol
2896 table (this is not the normal case), then do so. */
2899 struct elf_info_failed eif
;
2903 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2909 /* Attach all the symbols to their version information. */
2910 asvinfo
.output_bfd
= output_bfd
;
2911 asvinfo
.info
= info
;
2912 asvinfo
.verdefs
= verdefs
;
2913 asvinfo
.export_dynamic
= export_dynamic
;
2914 asvinfo
.failed
= false;
2916 elf_link_hash_traverse (elf_hash_table (info
),
2917 elf_link_assign_sym_version
,
2922 /* Find all symbols which were defined in a dynamic object and make
2923 the backend pick a reasonable value for them. */
2926 elf_link_hash_traverse (elf_hash_table (info
),
2927 elf_adjust_dynamic_symbol
,
2932 /* Add some entries to the .dynamic section. We fill in some of the
2933 values later, in elf_bfd_final_link, but we must add the entries
2934 now so that we know the final size of the .dynamic section. */
2936 /* If there are initialization and/or finalization functions to
2937 call then add the corresponding DT_INIT/DT_FINI entries. */
2938 h
= (info
->init_function
2939 ? elf_link_hash_lookup (elf_hash_table (info
),
2940 info
->init_function
, false,
2944 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2945 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2947 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2950 h
= (info
->fini_function
2951 ? elf_link_hash_lookup (elf_hash_table (info
),
2952 info
->fini_function
, false,
2956 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2957 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2959 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2963 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2964 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2965 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2966 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2967 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2968 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2969 sizeof (Elf_External_Sym
)))
2973 /* The backend must work out the sizes of all the other dynamic
2975 if (bed
->elf_backend_size_dynamic_sections
2976 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2979 if (elf_hash_table (info
)->dynamic_sections_created
)
2983 size_t bucketcount
= 0;
2984 Elf_Internal_Sym isym
;
2985 size_t hash_entry_size
;
2987 /* Set up the version definition section. */
2988 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2989 BFD_ASSERT (s
!= NULL
);
2991 /* We may have created additional version definitions if we are
2992 just linking a regular application. */
2993 verdefs
= asvinfo
.verdefs
;
2995 if (verdefs
== NULL
)
2996 _bfd_strip_section_from_output (info
, s
);
3001 struct bfd_elf_version_tree
*t
;
3003 Elf_Internal_Verdef def
;
3004 Elf_Internal_Verdaux defaux
;
3009 /* Make space for the base version. */
3010 size
+= sizeof (Elf_External_Verdef
);
3011 size
+= sizeof (Elf_External_Verdaux
);
3014 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3016 struct bfd_elf_version_deps
*n
;
3018 size
+= sizeof (Elf_External_Verdef
);
3019 size
+= sizeof (Elf_External_Verdaux
);
3022 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3023 size
+= sizeof (Elf_External_Verdaux
);
3026 s
->_raw_size
= size
;
3027 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3028 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3031 /* Fill in the version definition section. */
3035 def
.vd_version
= VER_DEF_CURRENT
;
3036 def
.vd_flags
= VER_FLG_BASE
;
3039 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3040 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3041 + sizeof (Elf_External_Verdaux
));
3043 if (soname_indx
!= (bfd_size_type
) -1)
3045 def
.vd_hash
= bfd_elf_hash (soname
);
3046 defaux
.vda_name
= soname_indx
;
3053 name
= output_bfd
->filename
;
3054 def
.vd_hash
= bfd_elf_hash (name
);
3055 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3057 if (indx
== (bfd_size_type
) -1)
3059 defaux
.vda_name
= indx
;
3061 defaux
.vda_next
= 0;
3063 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3064 (Elf_External_Verdef
*)p
);
3065 p
+= sizeof (Elf_External_Verdef
);
3066 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3067 (Elf_External_Verdaux
*) p
);
3068 p
+= sizeof (Elf_External_Verdaux
);
3070 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3073 struct bfd_elf_version_deps
*n
;
3074 struct elf_link_hash_entry
*h
;
3077 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3080 /* Add a symbol representing this version. */
3082 if (! (_bfd_generic_link_add_one_symbol
3083 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3084 (bfd_vma
) 0, (const char *) NULL
, false,
3085 get_elf_backend_data (dynobj
)->collect
,
3086 (struct bfd_link_hash_entry
**) &h
)))
3088 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3089 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3090 h
->type
= STT_OBJECT
;
3091 h
->verinfo
.vertree
= t
;
3093 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3096 def
.vd_version
= VER_DEF_CURRENT
;
3098 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3099 def
.vd_flags
|= VER_FLG_WEAK
;
3100 def
.vd_ndx
= t
->vernum
+ 1;
3101 def
.vd_cnt
= cdeps
+ 1;
3102 def
.vd_hash
= bfd_elf_hash (t
->name
);
3103 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3104 if (t
->next
!= NULL
)
3105 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3106 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3110 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3111 (Elf_External_Verdef
*) p
);
3112 p
+= sizeof (Elf_External_Verdef
);
3114 defaux
.vda_name
= h
->dynstr_index
;
3115 if (t
->deps
== NULL
)
3116 defaux
.vda_next
= 0;
3118 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3119 t
->name_indx
= defaux
.vda_name
;
3121 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3122 (Elf_External_Verdaux
*) p
);
3123 p
+= sizeof (Elf_External_Verdaux
);
3125 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3127 if (n
->version_needed
== NULL
)
3129 /* This can happen if there was an error in the
3131 defaux
.vda_name
= 0;
3134 defaux
.vda_name
= n
->version_needed
->name_indx
;
3135 if (n
->next
== NULL
)
3136 defaux
.vda_next
= 0;
3138 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3140 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3141 (Elf_External_Verdaux
*) p
);
3142 p
+= sizeof (Elf_External_Verdaux
);
3146 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
3147 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
3150 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3153 if (info
->new_dtags
&& info
->flags
)
3155 if (! elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
3162 info
->flags_1
&= ~ (DF_1_INITFIRST
3165 if (! elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
3169 /* Work out the size of the version reference section. */
3171 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3172 BFD_ASSERT (s
!= NULL
);
3174 struct elf_find_verdep_info sinfo
;
3176 sinfo
.output_bfd
= output_bfd
;
3178 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3179 if (sinfo
.vers
== 0)
3181 sinfo
.failed
= false;
3183 elf_link_hash_traverse (elf_hash_table (info
),
3184 elf_link_find_version_dependencies
,
3187 if (elf_tdata (output_bfd
)->verref
== NULL
)
3188 _bfd_strip_section_from_output (info
, s
);
3191 Elf_Internal_Verneed
*t
;
3196 /* Build the version definition section. */
3199 for (t
= elf_tdata (output_bfd
)->verref
;
3203 Elf_Internal_Vernaux
*a
;
3205 size
+= sizeof (Elf_External_Verneed
);
3207 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3208 size
+= sizeof (Elf_External_Vernaux
);
3211 s
->_raw_size
= size
;
3212 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
3213 if (s
->contents
== NULL
)
3217 for (t
= elf_tdata (output_bfd
)->verref
;
3222 Elf_Internal_Vernaux
*a
;
3226 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3229 t
->vn_version
= VER_NEED_CURRENT
;
3231 if (elf_dt_name (t
->vn_bfd
) != NULL
)
3232 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3233 elf_dt_name (t
->vn_bfd
),
3236 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3237 t
->vn_bfd
->filename
, true, false);
3238 if (indx
== (bfd_size_type
) -1)
3241 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3242 if (t
->vn_nextref
== NULL
)
3245 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3246 + caux
* sizeof (Elf_External_Vernaux
));
3248 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3249 (Elf_External_Verneed
*) p
);
3250 p
+= sizeof (Elf_External_Verneed
);
3252 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3254 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3255 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3256 a
->vna_nodename
, true, false);
3257 if (indx
== (bfd_size_type
) -1)
3260 if (a
->vna_nextptr
== NULL
)
3263 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3265 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3266 (Elf_External_Vernaux
*) p
);
3267 p
+= sizeof (Elf_External_Vernaux
);
3271 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3272 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3275 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3279 /* Assign dynsym indicies. In a shared library we generate a
3280 section symbol for each output section, which come first.
3281 Next come all of the back-end allocated local dynamic syms,
3282 followed by the rest of the global symbols. */
3284 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3286 /* Work out the size of the symbol version section. */
3287 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3288 BFD_ASSERT (s
!= NULL
);
3289 if (dynsymcount
== 0
3290 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3292 _bfd_strip_section_from_output (info
, s
);
3293 /* The DYNSYMCOUNT might have changed if we were going to
3294 output a dynamic symbol table entry for S. */
3295 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3299 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3300 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3301 if (s
->contents
== NULL
)
3304 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3308 /* Set the size of the .dynsym and .hash sections. We counted
3309 the number of dynamic symbols in elf_link_add_object_symbols.
3310 We will build the contents of .dynsym and .hash when we build
3311 the final symbol table, because until then we do not know the
3312 correct value to give the symbols. We built the .dynstr
3313 section as we went along in elf_link_add_object_symbols. */
3314 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3315 BFD_ASSERT (s
!= NULL
);
3316 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3317 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3318 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3321 /* The first entry in .dynsym is a dummy symbol. */
3328 elf_swap_symbol_out (output_bfd
, &isym
,
3329 (PTR
) (Elf_External_Sym
*) s
->contents
);
3331 /* Compute the size of the hashing table. As a side effect this
3332 computes the hash values for all the names we export. */
3333 bucketcount
= compute_bucket_count (info
);
3335 s
= bfd_get_section_by_name (dynobj
, ".hash");
3336 BFD_ASSERT (s
!= NULL
);
3337 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3338 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3339 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3340 if (s
->contents
== NULL
)
3342 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3344 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3345 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3346 s
->contents
+ hash_entry_size
);
3348 elf_hash_table (info
)->bucketcount
= bucketcount
;
3350 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3351 BFD_ASSERT (s
!= NULL
);
3352 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3354 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3361 /* Fix up the flags for a symbol. This handles various cases which
3362 can only be fixed after all the input files are seen. This is
3363 currently called by both adjust_dynamic_symbol and
3364 assign_sym_version, which is unnecessary but perhaps more robust in
3365 the face of future changes. */
3368 elf_fix_symbol_flags (h
, eif
)
3369 struct elf_link_hash_entry
*h
;
3370 struct elf_info_failed
*eif
;
3372 /* If this symbol was mentioned in a non-ELF file, try to set
3373 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3374 permit a non-ELF file to correctly refer to a symbol defined in
3375 an ELF dynamic object. */
3376 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3378 while (h
->root
.type
== bfd_link_hash_indirect
)
3379 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3381 if (h
->root
.type
!= bfd_link_hash_defined
3382 && h
->root
.type
!= bfd_link_hash_defweak
)
3383 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3384 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3387 if (h
->root
.u
.def
.section
->owner
!= NULL
3388 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3389 == bfd_target_elf_flavour
))
3390 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3391 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3393 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3396 if (h
->dynindx
== -1
3397 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3398 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3400 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3409 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3410 was first seen in a non-ELF file. Fortunately, if the symbol
3411 was first seen in an ELF file, we're probably OK unless the
3412 symbol was defined in a non-ELF file. Catch that case here.
3413 FIXME: We're still in trouble if the symbol was first seen in
3414 a dynamic object, and then later in a non-ELF regular object. */
3415 if ((h
->root
.type
== bfd_link_hash_defined
3416 || h
->root
.type
== bfd_link_hash_defweak
)
3417 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3418 && (h
->root
.u
.def
.section
->owner
!= NULL
3419 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3420 != bfd_target_elf_flavour
)
3421 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3422 && (h
->elf_link_hash_flags
3423 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3424 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3427 /* If this is a final link, and the symbol was defined as a common
3428 symbol in a regular object file, and there was no definition in
3429 any dynamic object, then the linker will have allocated space for
3430 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3431 flag will not have been set. */
3432 if (h
->root
.type
== bfd_link_hash_defined
3433 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3434 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3435 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3436 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3437 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3439 /* If -Bsymbolic was used (which means to bind references to global
3440 symbols to the definition within the shared object), and this
3441 symbol was defined in a regular object, then it actually doesn't
3442 need a PLT entry. Likewise, if the symbol has any kind of
3443 visibility (internal, hidden, or protected), it doesn't need a
3445 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3446 && eif
->info
->shared
3447 && (eif
->info
->symbolic
|| ELF_ST_VISIBILITY (h
->other
))
3448 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3450 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3451 h
->plt
.offset
= (bfd_vma
) -1;
3454 /* If this is a weak defined symbol in a dynamic object, and we know
3455 the real definition in the dynamic object, copy interesting flags
3456 over to the real definition. */
3457 if (h
->weakdef
!= NULL
)
3459 struct elf_link_hash_entry
*weakdef
;
3461 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3462 || h
->root
.type
== bfd_link_hash_defweak
);
3463 weakdef
= h
->weakdef
;
3464 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3465 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3466 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3468 /* If the real definition is defined by a regular object file,
3469 don't do anything special. See the longer description in
3470 elf_adjust_dynamic_symbol, below. */
3471 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3474 weakdef
->elf_link_hash_flags
|=
3475 (h
->elf_link_hash_flags
3476 & (ELF_LINK_HASH_REF_REGULAR
3477 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3478 | ELF_LINK_NON_GOT_REF
));
3484 /* Make the backend pick a good value for a dynamic symbol. This is
3485 called via elf_link_hash_traverse, and also calls itself
3489 elf_adjust_dynamic_symbol (h
, data
)
3490 struct elf_link_hash_entry
*h
;
3493 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3495 struct elf_backend_data
*bed
;
3497 /* Ignore indirect symbols. These are added by the versioning code. */
3498 if (h
->root
.type
== bfd_link_hash_indirect
)
3501 /* Fix the symbol flags. */
3502 if (! elf_fix_symbol_flags (h
, eif
))
3505 /* If this symbol does not require a PLT entry, and it is not
3506 defined by a dynamic object, or is not referenced by a regular
3507 object, ignore it. We do have to handle a weak defined symbol,
3508 even if no regular object refers to it, if we decided to add it
3509 to the dynamic symbol table. FIXME: Do we normally need to worry
3510 about symbols which are defined by one dynamic object and
3511 referenced by another one? */
3512 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3513 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3514 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3515 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3516 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3518 h
->plt
.offset
= (bfd_vma
) -1;
3522 /* If we've already adjusted this symbol, don't do it again. This
3523 can happen via a recursive call. */
3524 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3527 /* Don't look at this symbol again. Note that we must set this
3528 after checking the above conditions, because we may look at a
3529 symbol once, decide not to do anything, and then get called
3530 recursively later after REF_REGULAR is set below. */
3531 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3533 /* If this is a weak definition, and we know a real definition, and
3534 the real symbol is not itself defined by a regular object file,
3535 then get a good value for the real definition. We handle the
3536 real symbol first, for the convenience of the backend routine.
3538 Note that there is a confusing case here. If the real definition
3539 is defined by a regular object file, we don't get the real symbol
3540 from the dynamic object, but we do get the weak symbol. If the
3541 processor backend uses a COPY reloc, then if some routine in the
3542 dynamic object changes the real symbol, we will not see that
3543 change in the corresponding weak symbol. This is the way other
3544 ELF linkers work as well, and seems to be a result of the shared
3547 I will clarify this issue. Most SVR4 shared libraries define the
3548 variable _timezone and define timezone as a weak synonym. The
3549 tzset call changes _timezone. If you write
3550 extern int timezone;
3552 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3553 you might expect that, since timezone is a synonym for _timezone,
3554 the same number will print both times. However, if the processor
3555 backend uses a COPY reloc, then actually timezone will be copied
3556 into your process image, and, since you define _timezone
3557 yourself, _timezone will not. Thus timezone and _timezone will
3558 wind up at different memory locations. The tzset call will set
3559 _timezone, leaving timezone unchanged. */
3561 if (h
->weakdef
!= NULL
)
3563 /* If we get to this point, we know there is an implicit
3564 reference by a regular object file via the weak symbol H.
3565 FIXME: Is this really true? What if the traversal finds
3566 H->WEAKDEF before it finds H? */
3567 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3569 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
3573 /* If a symbol has no type and no size and does not require a PLT
3574 entry, then we are probably about to do the wrong thing here: we
3575 are probably going to create a COPY reloc for an empty object.
3576 This case can arise when a shared object is built with assembly
3577 code, and the assembly code fails to set the symbol type. */
3579 && h
->type
== STT_NOTYPE
3580 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3581 (*_bfd_error_handler
)
3582 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3583 h
->root
.root
.string
);
3585 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3586 bed
= get_elf_backend_data (dynobj
);
3587 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3596 /* This routine is used to export all defined symbols into the dynamic
3597 symbol table. It is called via elf_link_hash_traverse. */
3600 elf_export_symbol (h
, data
)
3601 struct elf_link_hash_entry
*h
;
3604 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3606 /* Ignore indirect symbols. These are added by the versioning code. */
3607 if (h
->root
.type
== bfd_link_hash_indirect
)
3610 if (h
->dynindx
== -1
3611 && (h
->elf_link_hash_flags
3612 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3614 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3624 /* Look through the symbols which are defined in other shared
3625 libraries and referenced here. Update the list of version
3626 dependencies. This will be put into the .gnu.version_r section.
3627 This function is called via elf_link_hash_traverse. */
3630 elf_link_find_version_dependencies (h
, data
)
3631 struct elf_link_hash_entry
*h
;
3634 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3635 Elf_Internal_Verneed
*t
;
3636 Elf_Internal_Vernaux
*a
;
3638 /* We only care about symbols defined in shared objects with version
3640 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3641 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3643 || h
->verinfo
.verdef
== NULL
)
3646 /* See if we already know about this version. */
3647 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3649 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3652 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3653 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3659 /* This is a new version. Add it to tree we are building. */
3663 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3666 rinfo
->failed
= true;
3670 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3671 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3672 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3675 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3677 /* Note that we are copying a string pointer here, and testing it
3678 above. If bfd_elf_string_from_elf_section is ever changed to
3679 discard the string data when low in memory, this will have to be
3681 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3683 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3684 a
->vna_nextptr
= t
->vn_auxptr
;
3686 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3689 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3696 /* Figure out appropriate versions for all the symbols. We may not
3697 have the version number script until we have read all of the input
3698 files, so until that point we don't know which symbols should be
3699 local. This function is called via elf_link_hash_traverse. */
3702 elf_link_assign_sym_version (h
, data
)
3703 struct elf_link_hash_entry
*h
;
3706 struct elf_assign_sym_version_info
*sinfo
=
3707 (struct elf_assign_sym_version_info
*) data
;
3708 struct bfd_link_info
*info
= sinfo
->info
;
3709 struct elf_backend_data
*bed
;
3710 struct elf_info_failed eif
;
3713 /* Fix the symbol flags. */
3716 if (! elf_fix_symbol_flags (h
, &eif
))
3719 sinfo
->failed
= true;
3723 /* We only need version numbers for symbols defined in regular
3725 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3728 bed
= get_elf_backend_data (sinfo
->output_bfd
);
3729 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3730 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3732 struct bfd_elf_version_tree
*t
;
3737 /* There are two consecutive ELF_VER_CHR characters if this is
3738 not a hidden symbol. */
3740 if (*p
== ELF_VER_CHR
)
3746 /* If there is no version string, we can just return out. */
3750 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3754 /* Look for the version. If we find it, it is no longer weak. */
3755 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3757 if (strcmp (t
->name
, p
) == 0)
3761 struct bfd_elf_version_expr
*d
;
3763 len
= p
- h
->root
.root
.string
;
3764 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3767 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3768 alc
[len
- 1] = '\0';
3769 if (alc
[len
- 2] == ELF_VER_CHR
)
3770 alc
[len
- 2] = '\0';
3772 h
->verinfo
.vertree
= t
;
3776 if (t
->globals
!= NULL
)
3778 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3779 if ((*d
->match
) (d
, alc
))
3783 /* See if there is anything to force this symbol to
3785 if (d
== NULL
&& t
->locals
!= NULL
)
3787 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3789 if ((*d
->match
) (d
, alc
))
3791 if (h
->dynindx
!= -1
3793 && ! sinfo
->export_dynamic
)
3795 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3796 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3797 /* FIXME: The name of the symbol has
3798 already been recorded in the dynamic
3799 string table section. */
3807 bfd_release (sinfo
->output_bfd
, alc
);
3812 /* If we are building an application, we need to create a
3813 version node for this version. */
3814 if (t
== NULL
&& ! info
->shared
)
3816 struct bfd_elf_version_tree
**pp
;
3819 /* If we aren't going to export this symbol, we don't need
3820 to worry about it. */
3821 if (h
->dynindx
== -1)
3824 t
= ((struct bfd_elf_version_tree
*)
3825 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3828 sinfo
->failed
= true;
3837 t
->name_indx
= (unsigned int) -1;
3841 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3843 t
->vernum
= version_index
;
3847 h
->verinfo
.vertree
= t
;
3851 /* We could not find the version for a symbol when
3852 generating a shared archive. Return an error. */
3853 (*_bfd_error_handler
)
3854 (_("%s: undefined versioned symbol name %s"),
3855 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3856 bfd_set_error (bfd_error_bad_value
);
3857 sinfo
->failed
= true;
3862 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3865 /* If we don't have a version for this symbol, see if we can find
3867 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3869 struct bfd_elf_version_tree
*t
;
3870 struct bfd_elf_version_tree
*deflt
;
3871 struct bfd_elf_version_expr
*d
;
3873 /* See if can find what version this symbol is in. If the
3874 symbol is supposed to be local, then don't actually register
3877 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3879 if (t
->globals
!= NULL
)
3881 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3883 if ((*d
->match
) (d
, h
->root
.root
.string
))
3885 h
->verinfo
.vertree
= t
;
3894 if (t
->locals
!= NULL
)
3896 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3898 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3900 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3902 h
->verinfo
.vertree
= t
;
3903 if (h
->dynindx
!= -1
3905 && ! sinfo
->export_dynamic
)
3907 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3908 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3909 /* FIXME: The name of the symbol has already
3910 been recorded in the dynamic string table
3922 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3924 h
->verinfo
.vertree
= deflt
;
3925 if (h
->dynindx
!= -1
3927 && ! sinfo
->export_dynamic
)
3929 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3930 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3931 /* FIXME: The name of the symbol has already been
3932 recorded in the dynamic string table section. */
3940 /* Final phase of ELF linker. */
3942 /* A structure we use to avoid passing large numbers of arguments. */
3944 struct elf_final_link_info
3946 /* General link information. */
3947 struct bfd_link_info
*info
;
3950 /* Symbol string table. */
3951 struct bfd_strtab_hash
*symstrtab
;
3952 /* .dynsym section. */
3953 asection
*dynsym_sec
;
3954 /* .hash section. */
3956 /* symbol version section (.gnu.version). */
3957 asection
*symver_sec
;
3958 /* Buffer large enough to hold contents of any section. */
3960 /* Buffer large enough to hold external relocs of any section. */
3961 PTR external_relocs
;
3962 /* Buffer large enough to hold internal relocs of any section. */
3963 Elf_Internal_Rela
*internal_relocs
;
3964 /* Buffer large enough to hold external local symbols of any input
3966 Elf_External_Sym
*external_syms
;
3967 /* Buffer large enough to hold internal local symbols of any input
3969 Elf_Internal_Sym
*internal_syms
;
3970 /* Array large enough to hold a symbol index for each local symbol
3971 of any input BFD. */
3973 /* Array large enough to hold a section pointer for each local
3974 symbol of any input BFD. */
3975 asection
**sections
;
3976 /* Buffer to hold swapped out symbols. */
3977 Elf_External_Sym
*symbuf
;
3978 /* Number of swapped out symbols in buffer. */
3979 size_t symbuf_count
;
3980 /* Number of symbols which fit in symbuf. */
3984 static boolean elf_link_output_sym
3985 PARAMS ((struct elf_final_link_info
*, const char *,
3986 Elf_Internal_Sym
*, asection
*));
3987 static boolean elf_link_flush_output_syms
3988 PARAMS ((struct elf_final_link_info
*));
3989 static boolean elf_link_output_extsym
3990 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3991 static boolean elf_link_input_bfd
3992 PARAMS ((struct elf_final_link_info
*, bfd
*));
3993 static boolean elf_reloc_link_order
3994 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3995 struct bfd_link_order
*));
3997 /* This struct is used to pass information to elf_link_output_extsym. */
3999 struct elf_outext_info
4003 struct elf_final_link_info
*finfo
;
4006 /* Compute the size of, and allocate space for, REL_HDR which is the
4007 section header for a section containing relocations for O. */
4010 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4012 Elf_Internal_Shdr
*rel_hdr
;
4015 register struct elf_link_hash_entry
**p
, **pend
;
4016 unsigned reloc_count
;
4018 /* Figure out how many relocations there will be. */
4019 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4020 reloc_count
= elf_section_data (o
)->rel_count
;
4022 reloc_count
= elf_section_data (o
)->rel_count2
;
4024 /* That allows us to calculate the size of the section. */
4025 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4027 /* The contents field must last into write_object_contents, so we
4028 allocate it with bfd_alloc rather than malloc. Also since we
4029 cannot be sure that the contents will actually be filled in,
4030 we zero the allocated space. */
4031 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4032 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4035 /* We only allocate one set of hash entries, so we only do it the
4036 first time we are called. */
4037 if (elf_section_data (o
)->rel_hashes
== NULL
)
4039 p
= ((struct elf_link_hash_entry
**)
4040 bfd_malloc (o
->reloc_count
4041 * sizeof (struct elf_link_hash_entry
*)));
4042 if (p
== NULL
&& o
->reloc_count
!= 0)
4045 elf_section_data (o
)->rel_hashes
= p
;
4046 pend
= p
+ o
->reloc_count
;
4047 for (; p
< pend
; p
++)
4054 /* When performing a relocateable link, the input relocations are
4055 preserved. But, if they reference global symbols, the indices
4056 referenced must be updated. Update all the relocations in
4057 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4060 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4062 Elf_Internal_Shdr
*rel_hdr
;
4064 struct elf_link_hash_entry
**rel_hash
;
4067 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4069 for (i
= 0; i
< count
; i
++, rel_hash
++)
4071 if (*rel_hash
== NULL
)
4074 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4076 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4078 Elf_External_Rel
*erel
;
4079 Elf_Internal_Rel irel
;
4081 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4082 if (bed
->s
->swap_reloc_in
)
4083 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &irel
);
4085 elf_swap_reloc_in (abfd
, erel
, &irel
);
4086 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4087 ELF_R_TYPE (irel
.r_info
));
4088 if (bed
->s
->swap_reloc_out
)
4089 (*bed
->s
->swap_reloc_out
) (abfd
, &irel
, (bfd_byte
*) erel
);
4091 elf_swap_reloc_out (abfd
, &irel
, erel
);
4095 Elf_External_Rela
*erela
;
4096 Elf_Internal_Rela irela
;
4098 BFD_ASSERT (rel_hdr
->sh_entsize
4099 == sizeof (Elf_External_Rela
));
4101 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4102 if (bed
->s
->swap_reloca_in
)
4103 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, &irela
);
4105 elf_swap_reloca_in (abfd
, erela
, &irela
);
4106 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4107 ELF_R_TYPE (irela
.r_info
));
4108 if (bed
->s
->swap_reloca_out
)
4109 (*bed
->s
->swap_reloca_out
) (abfd
, &irela
, (bfd_byte
*) erela
);
4111 elf_swap_reloca_out (abfd
, &irela
, erela
);
4116 /* Do the final step of an ELF link. */
4119 elf_bfd_final_link (abfd
, info
)
4121 struct bfd_link_info
*info
;
4125 struct elf_final_link_info finfo
;
4126 register asection
*o
;
4127 register struct bfd_link_order
*p
;
4129 size_t max_contents_size
;
4130 size_t max_external_reloc_size
;
4131 size_t max_internal_reloc_count
;
4132 size_t max_sym_count
;
4134 Elf_Internal_Sym elfsym
;
4136 Elf_Internal_Shdr
*symtab_hdr
;
4137 Elf_Internal_Shdr
*symstrtab_hdr
;
4138 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4139 struct elf_outext_info eoinfo
;
4142 abfd
->flags
|= DYNAMIC
;
4144 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4145 dynobj
= elf_hash_table (info
)->dynobj
;
4148 finfo
.output_bfd
= abfd
;
4149 finfo
.symstrtab
= elf_stringtab_init ();
4150 if (finfo
.symstrtab
== NULL
)
4155 finfo
.dynsym_sec
= NULL
;
4156 finfo
.hash_sec
= NULL
;
4157 finfo
.symver_sec
= NULL
;
4161 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4162 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4163 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4164 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4165 /* Note that it is OK if symver_sec is NULL. */
4168 finfo
.contents
= NULL
;
4169 finfo
.external_relocs
= NULL
;
4170 finfo
.internal_relocs
= NULL
;
4171 finfo
.external_syms
= NULL
;
4172 finfo
.internal_syms
= NULL
;
4173 finfo
.indices
= NULL
;
4174 finfo
.sections
= NULL
;
4175 finfo
.symbuf
= NULL
;
4176 finfo
.symbuf_count
= 0;
4178 /* Count up the number of relocations we will output for each output
4179 section, so that we know the sizes of the reloc sections. We
4180 also figure out some maximum sizes. */
4181 max_contents_size
= 0;
4182 max_external_reloc_size
= 0;
4183 max_internal_reloc_count
= 0;
4185 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4189 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4191 if (p
->type
== bfd_section_reloc_link_order
4192 || p
->type
== bfd_symbol_reloc_link_order
)
4194 else if (p
->type
== bfd_indirect_link_order
)
4198 sec
= p
->u
.indirect
.section
;
4200 /* Mark all sections which are to be included in the
4201 link. This will normally be every section. We need
4202 to do this so that we can identify any sections which
4203 the linker has decided to not include. */
4204 sec
->linker_mark
= true;
4206 if (info
->relocateable
|| info
->emitrelocations
)
4207 o
->reloc_count
+= sec
->reloc_count
;
4209 if (sec
->_raw_size
> max_contents_size
)
4210 max_contents_size
= sec
->_raw_size
;
4211 if (sec
->_cooked_size
> max_contents_size
)
4212 max_contents_size
= sec
->_cooked_size
;
4214 /* We are interested in just local symbols, not all
4216 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4217 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4221 if (elf_bad_symtab (sec
->owner
))
4222 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4223 / sizeof (Elf_External_Sym
));
4225 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4227 if (sym_count
> max_sym_count
)
4228 max_sym_count
= sym_count
;
4230 if ((sec
->flags
& SEC_RELOC
) != 0)
4234 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4235 if (ext_size
> max_external_reloc_size
)
4236 max_external_reloc_size
= ext_size
;
4237 if (sec
->reloc_count
> max_internal_reloc_count
)
4238 max_internal_reloc_count
= sec
->reloc_count
;
4244 if (o
->reloc_count
> 0)
4245 o
->flags
|= SEC_RELOC
;
4248 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4249 set it (this is probably a bug) and if it is set
4250 assign_section_numbers will create a reloc section. */
4251 o
->flags
&=~ SEC_RELOC
;
4254 /* If the SEC_ALLOC flag is not set, force the section VMA to
4255 zero. This is done in elf_fake_sections as well, but forcing
4256 the VMA to 0 here will ensure that relocs against these
4257 sections are handled correctly. */
4258 if ((o
->flags
& SEC_ALLOC
) == 0
4259 && ! o
->user_set_vma
)
4263 /* Figure out the file positions for everything but the symbol table
4264 and the relocs. We set symcount to force assign_section_numbers
4265 to create a symbol table. */
4266 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4267 BFD_ASSERT (! abfd
->output_has_begun
);
4268 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4271 /* Figure out how many relocations we will have in each section.
4272 Just using RELOC_COUNT isn't good enough since that doesn't
4273 maintain a separate value for REL vs. RELA relocations. */
4274 if (info
->relocateable
|| info
->emitrelocations
)
4275 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4276 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4278 asection
*output_section
;
4280 if (! o
->linker_mark
)
4282 /* This section was omitted from the link. */
4286 output_section
= o
->output_section
;
4288 if (output_section
!= NULL
4289 && (o
->flags
& SEC_RELOC
) != 0)
4291 struct bfd_elf_section_data
*esdi
4292 = elf_section_data (o
);
4293 struct bfd_elf_section_data
*esdo
4294 = elf_section_data (output_section
);
4295 unsigned int *rel_count
;
4296 unsigned int *rel_count2
;
4298 /* We must be careful to add the relocation froms the
4299 input section to the right output count. */
4300 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
4302 rel_count
= &esdo
->rel_count
;
4303 rel_count2
= &esdo
->rel_count2
;
4307 rel_count
= &esdo
->rel_count2
;
4308 rel_count2
= &esdo
->rel_count
;
4311 *rel_count
+= (esdi
->rel_hdr
.sh_size
4312 / esdi
->rel_hdr
.sh_entsize
);
4314 *rel_count2
+= (esdi
->rel_hdr2
->sh_size
4315 / esdi
->rel_hdr2
->sh_entsize
);
4319 /* That created the reloc sections. Set their sizes, and assign
4320 them file positions, and allocate some buffers. */
4321 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4323 if ((o
->flags
& SEC_RELOC
) != 0)
4325 if (!elf_link_size_reloc_section (abfd
,
4326 &elf_section_data (o
)->rel_hdr
,
4330 if (elf_section_data (o
)->rel_hdr2
4331 && !elf_link_size_reloc_section (abfd
,
4332 elf_section_data (o
)->rel_hdr2
,
4337 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4338 to count upwards while actually outputting the relocations. */
4339 elf_section_data (o
)->rel_count
= 0;
4340 elf_section_data (o
)->rel_count2
= 0;
4343 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4345 /* We have now assigned file positions for all the sections except
4346 .symtab and .strtab. We start the .symtab section at the current
4347 file position, and write directly to it. We build the .strtab
4348 section in memory. */
4349 bfd_get_symcount (abfd
) = 0;
4350 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4351 /* sh_name is set in prep_headers. */
4352 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4353 symtab_hdr
->sh_flags
= 0;
4354 symtab_hdr
->sh_addr
= 0;
4355 symtab_hdr
->sh_size
= 0;
4356 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4357 /* sh_link is set in assign_section_numbers. */
4358 /* sh_info is set below. */
4359 /* sh_offset is set just below. */
4360 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4362 off
= elf_tdata (abfd
)->next_file_pos
;
4363 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4365 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4366 incorrect. We do not yet know the size of the .symtab section.
4367 We correct next_file_pos below, after we do know the size. */
4369 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4370 continuously seeking to the right position in the file. */
4371 if (! info
->keep_memory
|| max_sym_count
< 20)
4372 finfo
.symbuf_size
= 20;
4374 finfo
.symbuf_size
= max_sym_count
;
4375 finfo
.symbuf
= ((Elf_External_Sym
*)
4376 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4377 if (finfo
.symbuf
== NULL
)
4380 /* Start writing out the symbol table. The first symbol is always a
4382 if (info
->strip
!= strip_all
|| info
->relocateable
|| info
->emitrelocations
)
4384 elfsym
.st_value
= 0;
4387 elfsym
.st_other
= 0;
4388 elfsym
.st_shndx
= SHN_UNDEF
;
4389 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4390 &elfsym
, bfd_und_section_ptr
))
4395 /* Some standard ELF linkers do this, but we don't because it causes
4396 bootstrap comparison failures. */
4397 /* Output a file symbol for the output file as the second symbol.
4398 We output this even if we are discarding local symbols, although
4399 I'm not sure if this is correct. */
4400 elfsym
.st_value
= 0;
4402 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4403 elfsym
.st_other
= 0;
4404 elfsym
.st_shndx
= SHN_ABS
;
4405 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4406 &elfsym
, bfd_abs_section_ptr
))
4410 /* Output a symbol for each section. We output these even if we are
4411 discarding local symbols, since they are used for relocs. These
4412 symbols have no names. We store the index of each one in the
4413 index field of the section, so that we can find it again when
4414 outputting relocs. */
4415 if (info
->strip
!= strip_all
|| info
->relocateable
|| info
->emitrelocations
)
4418 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4419 elfsym
.st_other
= 0;
4420 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4422 o
= section_from_elf_index (abfd
, i
);
4424 o
->target_index
= bfd_get_symcount (abfd
);
4425 elfsym
.st_shndx
= i
;
4426 if (info
->relocateable
|| o
== NULL
)
4427 elfsym
.st_value
= 0;
4429 elfsym
.st_value
= o
->vma
;
4430 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4436 /* Allocate some memory to hold information read in from the input
4438 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4439 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4440 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4441 bfd_malloc (max_internal_reloc_count
4442 * sizeof (Elf_Internal_Rela
)
4443 * bed
->s
->int_rels_per_ext_rel
));
4444 finfo
.external_syms
= ((Elf_External_Sym
*)
4445 bfd_malloc (max_sym_count
4446 * sizeof (Elf_External_Sym
)));
4447 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4448 bfd_malloc (max_sym_count
4449 * sizeof (Elf_Internal_Sym
)));
4450 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4451 finfo
.sections
= ((asection
**)
4452 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4453 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4454 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4455 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4456 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4457 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4458 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4459 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4462 /* Since ELF permits relocations to be against local symbols, we
4463 must have the local symbols available when we do the relocations.
4464 Since we would rather only read the local symbols once, and we
4465 would rather not keep them in memory, we handle all the
4466 relocations for a single input file at the same time.
4468 Unfortunately, there is no way to know the total number of local
4469 symbols until we have seen all of them, and the local symbol
4470 indices precede the global symbol indices. This means that when
4471 we are generating relocateable output, and we see a reloc against
4472 a global symbol, we can not know the symbol index until we have
4473 finished examining all the local symbols to see which ones we are
4474 going to output. To deal with this, we keep the relocations in
4475 memory, and don't output them until the end of the link. This is
4476 an unfortunate waste of memory, but I don't see a good way around
4477 it. Fortunately, it only happens when performing a relocateable
4478 link, which is not the common case. FIXME: If keep_memory is set
4479 we could write the relocs out and then read them again; I don't
4480 know how bad the memory loss will be. */
4482 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4483 sub
->output_has_begun
= false;
4484 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4486 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4488 if (p
->type
== bfd_indirect_link_order
4489 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4490 == bfd_target_elf_flavour
))
4492 sub
= p
->u
.indirect
.section
->owner
;
4493 if (! sub
->output_has_begun
)
4495 if (! elf_link_input_bfd (&finfo
, sub
))
4497 sub
->output_has_begun
= true;
4500 else if (p
->type
== bfd_section_reloc_link_order
4501 || p
->type
== bfd_symbol_reloc_link_order
)
4503 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4508 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4514 /* That wrote out all the local symbols. Finish up the symbol table
4515 with the global symbols. Even if we want to strip everything we
4516 can, we still need to deal with those global symbols that got
4517 converted to local in a version script. */
4521 /* Output any global symbols that got converted to local in a
4522 version script. We do this in a separate step since ELF
4523 requires all local symbols to appear prior to any global
4524 symbols. FIXME: We should only do this if some global
4525 symbols were, in fact, converted to become local. FIXME:
4526 Will this work correctly with the Irix 5 linker? */
4527 eoinfo
.failed
= false;
4528 eoinfo
.finfo
= &finfo
;
4529 eoinfo
.localsyms
= true;
4530 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4536 /* The sh_info field records the index of the first non local symbol. */
4537 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4541 Elf_Internal_Sym sym
;
4542 Elf_External_Sym
*dynsym
=
4543 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4544 long last_local
= 0;
4546 /* Write out the section symbols for the output sections. */
4553 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4556 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4559 indx
= elf_section_data (s
)->this_idx
;
4560 BFD_ASSERT (indx
> 0);
4561 sym
.st_shndx
= indx
;
4562 sym
.st_value
= s
->vma
;
4564 elf_swap_symbol_out (abfd
, &sym
,
4565 dynsym
+ elf_section_data (s
)->dynindx
);
4568 last_local
= bfd_count_sections (abfd
);
4571 /* Write out the local dynsyms. */
4572 if (elf_hash_table (info
)->dynlocal
)
4574 struct elf_link_local_dynamic_entry
*e
;
4575 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4579 sym
.st_size
= e
->isym
.st_size
;
4580 sym
.st_other
= e
->isym
.st_other
;
4582 /* Copy the internal symbol as is.
4583 Note that we saved a word of storage and overwrote
4584 the original st_name with the dynstr_index. */
4587 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4589 s
= bfd_section_from_elf_index (e
->input_bfd
,
4593 elf_section_data (s
->output_section
)->this_idx
;
4594 sym
.st_value
= (s
->output_section
->vma
4596 + e
->isym
.st_value
);
4599 if (last_local
< e
->dynindx
)
4600 last_local
= e
->dynindx
;
4602 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4606 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
4610 /* We get the global symbols from the hash table. */
4611 eoinfo
.failed
= false;
4612 eoinfo
.localsyms
= false;
4613 eoinfo
.finfo
= &finfo
;
4614 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4619 /* If backend needs to output some symbols not present in the hash
4620 table, do it now. */
4621 if (bed
->elf_backend_output_arch_syms
)
4623 if (! (*bed
->elf_backend_output_arch_syms
)
4624 (abfd
, info
, (PTR
) &finfo
,
4625 (boolean (*) PARAMS ((PTR
, const char *,
4626 Elf_Internal_Sym
*, asection
*)))
4627 elf_link_output_sym
))
4631 /* Flush all symbols to the file. */
4632 if (! elf_link_flush_output_syms (&finfo
))
4635 /* Now we know the size of the symtab section. */
4636 off
+= symtab_hdr
->sh_size
;
4638 /* Finish up and write out the symbol string table (.strtab)
4640 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4641 /* sh_name was set in prep_headers. */
4642 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4643 symstrtab_hdr
->sh_flags
= 0;
4644 symstrtab_hdr
->sh_addr
= 0;
4645 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4646 symstrtab_hdr
->sh_entsize
= 0;
4647 symstrtab_hdr
->sh_link
= 0;
4648 symstrtab_hdr
->sh_info
= 0;
4649 /* sh_offset is set just below. */
4650 symstrtab_hdr
->sh_addralign
= 1;
4652 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4653 elf_tdata (abfd
)->next_file_pos
= off
;
4655 if (bfd_get_symcount (abfd
) > 0)
4657 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4658 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4662 /* Adjust the relocs to have the correct symbol indices. */
4663 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4665 if ((o
->flags
& SEC_RELOC
) == 0)
4668 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4669 elf_section_data (o
)->rel_count
,
4670 elf_section_data (o
)->rel_hashes
);
4671 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4672 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4673 elf_section_data (o
)->rel_count2
,
4674 (elf_section_data (o
)->rel_hashes
4675 + elf_section_data (o
)->rel_count
));
4677 /* Set the reloc_count field to 0 to prevent write_relocs from
4678 trying to swap the relocs out itself. */
4682 /* If we are linking against a dynamic object, or generating a
4683 shared library, finish up the dynamic linking information. */
4686 Elf_External_Dyn
*dyncon
, *dynconend
;
4688 /* Fix up .dynamic entries. */
4689 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4690 BFD_ASSERT (o
!= NULL
);
4692 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4693 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4694 for (; dyncon
< dynconend
; dyncon
++)
4696 Elf_Internal_Dyn dyn
;
4700 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4707 name
= info
->init_function
;
4710 name
= info
->fini_function
;
4713 struct elf_link_hash_entry
*h
;
4715 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4716 false, false, true);
4718 && (h
->root
.type
== bfd_link_hash_defined
4719 || h
->root
.type
== bfd_link_hash_defweak
))
4721 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4722 o
= h
->root
.u
.def
.section
;
4723 if (o
->output_section
!= NULL
)
4724 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4725 + o
->output_offset
);
4728 /* The symbol is imported from another shared
4729 library and does not apply to this one. */
4733 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4748 name
= ".gnu.version_d";
4751 name
= ".gnu.version_r";
4754 name
= ".gnu.version";
4756 o
= bfd_get_section_by_name (abfd
, name
);
4757 BFD_ASSERT (o
!= NULL
);
4758 dyn
.d_un
.d_ptr
= o
->vma
;
4759 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4766 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4771 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4773 Elf_Internal_Shdr
*hdr
;
4775 hdr
= elf_elfsections (abfd
)[i
];
4776 if (hdr
->sh_type
== type
4777 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4779 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4780 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4783 if (dyn
.d_un
.d_val
== 0
4784 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4785 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4789 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4795 /* If we have created any dynamic sections, then output them. */
4798 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4801 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4803 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4804 || o
->_raw_size
== 0)
4806 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4808 /* At this point, we are only interested in sections
4809 created by elf_link_create_dynamic_sections. */
4812 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4814 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4816 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4817 o
->contents
, o
->output_offset
,
4825 /* The contents of the .dynstr section are actually in a
4827 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4828 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4829 || ! _bfd_stringtab_emit (abfd
,
4830 elf_hash_table (info
)->dynstr
))
4836 /* If we have optimized stabs strings, output them. */
4837 if (elf_hash_table (info
)->stab_info
!= NULL
)
4839 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4843 if (finfo
.symstrtab
!= NULL
)
4844 _bfd_stringtab_free (finfo
.symstrtab
);
4845 if (finfo
.contents
!= NULL
)
4846 free (finfo
.contents
);
4847 if (finfo
.external_relocs
!= NULL
)
4848 free (finfo
.external_relocs
);
4849 if (finfo
.internal_relocs
!= NULL
)
4850 free (finfo
.internal_relocs
);
4851 if (finfo
.external_syms
!= NULL
)
4852 free (finfo
.external_syms
);
4853 if (finfo
.internal_syms
!= NULL
)
4854 free (finfo
.internal_syms
);
4855 if (finfo
.indices
!= NULL
)
4856 free (finfo
.indices
);
4857 if (finfo
.sections
!= NULL
)
4858 free (finfo
.sections
);
4859 if (finfo
.symbuf
!= NULL
)
4860 free (finfo
.symbuf
);
4861 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4863 if ((o
->flags
& SEC_RELOC
) != 0
4864 && elf_section_data (o
)->rel_hashes
!= NULL
)
4865 free (elf_section_data (o
)->rel_hashes
);
4868 elf_tdata (abfd
)->linker
= true;
4873 if (finfo
.symstrtab
!= NULL
)
4874 _bfd_stringtab_free (finfo
.symstrtab
);
4875 if (finfo
.contents
!= NULL
)
4876 free (finfo
.contents
);
4877 if (finfo
.external_relocs
!= NULL
)
4878 free (finfo
.external_relocs
);
4879 if (finfo
.internal_relocs
!= NULL
)
4880 free (finfo
.internal_relocs
);
4881 if (finfo
.external_syms
!= NULL
)
4882 free (finfo
.external_syms
);
4883 if (finfo
.internal_syms
!= NULL
)
4884 free (finfo
.internal_syms
);
4885 if (finfo
.indices
!= NULL
)
4886 free (finfo
.indices
);
4887 if (finfo
.sections
!= NULL
)
4888 free (finfo
.sections
);
4889 if (finfo
.symbuf
!= NULL
)
4890 free (finfo
.symbuf
);
4891 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4893 if ((o
->flags
& SEC_RELOC
) != 0
4894 && elf_section_data (o
)->rel_hashes
!= NULL
)
4895 free (elf_section_data (o
)->rel_hashes
);
4901 /* Add a symbol to the output symbol table. */
4904 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4905 struct elf_final_link_info
*finfo
;
4907 Elf_Internal_Sym
*elfsym
;
4908 asection
*input_sec
;
4910 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4911 struct bfd_link_info
*info
,
4916 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4917 elf_backend_link_output_symbol_hook
;
4918 if (output_symbol_hook
!= NULL
)
4920 if (! ((*output_symbol_hook
)
4921 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4925 if (name
== (const char *) NULL
|| *name
== '\0')
4926 elfsym
->st_name
= 0;
4927 else if (input_sec
->flags
& SEC_EXCLUDE
)
4928 elfsym
->st_name
= 0;
4931 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4934 if (elfsym
->st_name
== (unsigned long) -1)
4938 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4940 if (! elf_link_flush_output_syms (finfo
))
4944 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4945 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4946 ++finfo
->symbuf_count
;
4948 ++ bfd_get_symcount (finfo
->output_bfd
);
4953 /* Flush the output symbols to the file. */
4956 elf_link_flush_output_syms (finfo
)
4957 struct elf_final_link_info
*finfo
;
4959 if (finfo
->symbuf_count
> 0)
4961 Elf_Internal_Shdr
*symtab
;
4963 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4965 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4967 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4968 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4969 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4972 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4974 finfo
->symbuf_count
= 0;
4980 /* Add an external symbol to the symbol table. This is called from
4981 the hash table traversal routine. When generating a shared object,
4982 we go through the symbol table twice. The first time we output
4983 anything that might have been forced to local scope in a version
4984 script. The second time we output the symbols that are still
4988 elf_link_output_extsym (h
, data
)
4989 struct elf_link_hash_entry
*h
;
4992 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4993 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4995 Elf_Internal_Sym sym
;
4996 asection
*input_sec
;
4998 /* Decide whether to output this symbol in this pass. */
4999 if (eoinfo
->localsyms
)
5001 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5006 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5010 /* If we are not creating a shared library, and this symbol is
5011 referenced by a shared library but is not defined anywhere, then
5012 warn that it is undefined. If we do not do this, the runtime
5013 linker will complain that the symbol is undefined when the
5014 program is run. We don't have to worry about symbols that are
5015 referenced by regular files, because we will already have issued
5016 warnings for them. */
5017 if (! finfo
->info
->relocateable
5018 && ! (finfo
->info
->shared
5019 && !finfo
->info
->no_undefined
)
5020 && h
->root
.type
== bfd_link_hash_undefined
5021 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5022 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5024 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5025 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5026 (asection
*) NULL
, 0, true)))
5028 eoinfo
->failed
= true;
5033 /* We don't want to output symbols that have never been mentioned by
5034 a regular file, or that we have been told to strip. However, if
5035 h->indx is set to -2, the symbol is used by a reloc and we must
5039 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
5040 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
5041 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
5042 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5044 else if (finfo
->info
->strip
== strip_all
5045 || (finfo
->info
->strip
== strip_some
5046 && bfd_hash_lookup (finfo
->info
->keep_hash
,
5047 h
->root
.root
.string
,
5048 false, false) == NULL
))
5053 /* If we're stripping it, and it's not a dynamic symbol, there's
5054 nothing else to do unless it is a forced local symbol. */
5057 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5061 sym
.st_size
= h
->size
;
5062 sym
.st_other
= h
->other
;
5063 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5064 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
5065 else if (h
->root
.type
== bfd_link_hash_undefweak
5066 || h
->root
.type
== bfd_link_hash_defweak
)
5067 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
5069 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
5071 switch (h
->root
.type
)
5074 case bfd_link_hash_new
:
5078 case bfd_link_hash_undefined
:
5079 input_sec
= bfd_und_section_ptr
;
5080 sym
.st_shndx
= SHN_UNDEF
;
5083 case bfd_link_hash_undefweak
:
5084 input_sec
= bfd_und_section_ptr
;
5085 sym
.st_shndx
= SHN_UNDEF
;
5088 case bfd_link_hash_defined
:
5089 case bfd_link_hash_defweak
:
5091 input_sec
= h
->root
.u
.def
.section
;
5092 if (input_sec
->output_section
!= NULL
)
5095 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
5096 input_sec
->output_section
);
5097 if (sym
.st_shndx
== (unsigned short) -1)
5099 (*_bfd_error_handler
)
5100 (_("%s: could not find output section %s for input section %s"),
5101 bfd_get_filename (finfo
->output_bfd
),
5102 input_sec
->output_section
->name
,
5104 eoinfo
->failed
= true;
5108 /* ELF symbols in relocateable files are section relative,
5109 but in nonrelocateable files they are virtual
5111 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
5112 if (! finfo
->info
->relocateable
)
5113 sym
.st_value
+= input_sec
->output_section
->vma
;
5117 BFD_ASSERT (input_sec
->owner
== NULL
5118 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
5119 sym
.st_shndx
= SHN_UNDEF
;
5120 input_sec
= bfd_und_section_ptr
;
5125 case bfd_link_hash_common
:
5126 input_sec
= h
->root
.u
.c
.p
->section
;
5127 sym
.st_shndx
= SHN_COMMON
;
5128 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
5131 case bfd_link_hash_indirect
:
5132 /* These symbols are created by symbol versioning. They point
5133 to the decorated version of the name. For example, if the
5134 symbol foo@@GNU_1.2 is the default, which should be used when
5135 foo is used with no version, then we add an indirect symbol
5136 foo which points to foo@@GNU_1.2. We ignore these symbols,
5137 since the indirected symbol is already in the hash table. */
5140 case bfd_link_hash_warning
:
5141 /* We can't represent these symbols in ELF, although a warning
5142 symbol may have come from a .gnu.warning.SYMBOL section. We
5143 just put the target symbol in the hash table. If the target
5144 symbol does not really exist, don't do anything. */
5145 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
5147 return (elf_link_output_extsym
5148 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
5151 /* Give the processor backend a chance to tweak the symbol value,
5152 and also to finish up anything that needs to be done for this
5154 if ((h
->dynindx
!= -1
5155 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5156 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5158 struct elf_backend_data
*bed
;
5160 bed
= get_elf_backend_data (finfo
->output_bfd
);
5161 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
5162 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
5164 eoinfo
->failed
= true;
5169 /* If we are marking the symbol as undefined, and there are no
5170 non-weak references to this symbol from a regular object, then
5171 mark the symbol as weak undefined; if there are non-weak
5172 references, mark the symbol as strong. We can't do this earlier,
5173 because it might not be marked as undefined until the
5174 finish_dynamic_symbol routine gets through with it. */
5175 if (sym
.st_shndx
== SHN_UNDEF
5176 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
5177 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
5178 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
5182 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
5183 bindtype
= STB_GLOBAL
;
5185 bindtype
= STB_WEAK
;
5186 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
5189 /* If a symbol is not defined locally, we clear the visibility
5191 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5192 sym
.st_other
^= ELF_ST_VISIBILITY(sym
.st_other
);
5194 /* If this symbol should be put in the .dynsym section, then put it
5195 there now. We have already know the symbol index. We also fill
5196 in the entry in the .hash section. */
5197 if (h
->dynindx
!= -1
5198 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5202 size_t hash_entry_size
;
5203 bfd_byte
*bucketpos
;
5206 sym
.st_name
= h
->dynstr_index
;
5208 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
5209 (PTR
) (((Elf_External_Sym
*)
5210 finfo
->dynsym_sec
->contents
)
5213 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
5214 bucket
= h
->elf_hash_value
% bucketcount
;
5216 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
5217 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
5218 + (bucket
+ 2) * hash_entry_size
);
5219 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
5220 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
5221 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
5222 ((bfd_byte
*) finfo
->hash_sec
->contents
5223 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
5225 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
5227 Elf_Internal_Versym iversym
;
5229 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5231 if (h
->verinfo
.verdef
== NULL
)
5232 iversym
.vs_vers
= 0;
5234 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
5238 if (h
->verinfo
.vertree
== NULL
)
5239 iversym
.vs_vers
= 1;
5241 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
5244 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
5245 iversym
.vs_vers
|= VERSYM_HIDDEN
;
5247 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
5248 (((Elf_External_Versym
*)
5249 finfo
->symver_sec
->contents
)
5254 /* If we're stripping it, then it was just a dynamic symbol, and
5255 there's nothing else to do. */
5259 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
5261 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
5263 eoinfo
->failed
= true;
5270 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5271 originated from the section given by INPUT_REL_HDR) to the
5275 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
5278 asection
*input_section
;
5279 Elf_Internal_Shdr
*input_rel_hdr
;
5280 Elf_Internal_Rela
*internal_relocs
;
5282 Elf_Internal_Rela
*irela
;
5283 Elf_Internal_Rela
*irelaend
;
5284 Elf_Internal_Shdr
*output_rel_hdr
;
5285 asection
*output_section
;
5286 unsigned int *rel_countp
= NULL
;
5287 struct elf_backend_data
*bed
;
5289 output_section
= input_section
->output_section
;
5290 output_rel_hdr
= NULL
;
5292 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
5293 == input_rel_hdr
->sh_entsize
)
5295 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5296 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5298 else if (elf_section_data (output_section
)->rel_hdr2
5299 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5300 == input_rel_hdr
->sh_entsize
))
5302 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5303 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5306 BFD_ASSERT (output_rel_hdr
!= NULL
);
5308 bed
= get_elf_backend_data (output_bfd
);
5309 irela
= internal_relocs
;
5310 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5311 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5313 Elf_External_Rel
*erel
;
5315 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5316 for (; irela
< irelaend
; irela
++, erel
++)
5318 Elf_Internal_Rel irel
;
5320 irel
.r_offset
= irela
->r_offset
;
5321 irel
.r_info
= irela
->r_info
;
5322 BFD_ASSERT (irela
->r_addend
== 0);
5323 if (bed
->s
->swap_reloc_out
)
5324 (*bed
->s
->swap_reloc_out
) (output_bfd
, &irel
, (PTR
) erel
);
5326 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5331 Elf_External_Rela
*erela
;
5333 BFD_ASSERT (input_rel_hdr
->sh_entsize
5334 == sizeof (Elf_External_Rela
));
5335 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5336 for (; irela
< irelaend
; irela
++, erela
++)
5337 if (bed
->s
->swap_reloca_out
)
5338 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
5340 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5343 /* Bump the counter, so that we know where to add the next set of
5345 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5348 /* Link an input file into the linker output file. This function
5349 handles all the sections and relocations of the input file at once.
5350 This is so that we only have to read the local symbols once, and
5351 don't have to keep them in memory. */
5354 elf_link_input_bfd (finfo
, input_bfd
)
5355 struct elf_final_link_info
*finfo
;
5358 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5359 bfd
*, asection
*, bfd_byte
*,
5360 Elf_Internal_Rela
*,
5361 Elf_Internal_Sym
*, asection
**));
5363 Elf_Internal_Shdr
*symtab_hdr
;
5366 Elf_External_Sym
*external_syms
;
5367 Elf_External_Sym
*esym
;
5368 Elf_External_Sym
*esymend
;
5369 Elf_Internal_Sym
*isym
;
5371 asection
**ppsection
;
5373 struct elf_backend_data
*bed
;
5375 output_bfd
= finfo
->output_bfd
;
5376 bed
= get_elf_backend_data (output_bfd
);
5377 relocate_section
= bed
->elf_backend_relocate_section
;
5379 /* If this is a dynamic object, we don't want to do anything here:
5380 we don't want the local symbols, and we don't want the section
5382 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5385 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5386 if (elf_bad_symtab (input_bfd
))
5388 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5393 locsymcount
= symtab_hdr
->sh_info
;
5394 extsymoff
= symtab_hdr
->sh_info
;
5397 /* Read the local symbols. */
5398 if (symtab_hdr
->contents
!= NULL
)
5399 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5400 else if (locsymcount
== 0)
5401 external_syms
= NULL
;
5404 external_syms
= finfo
->external_syms
;
5405 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5406 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5407 locsymcount
, input_bfd
)
5408 != locsymcount
* sizeof (Elf_External_Sym
)))
5412 /* Swap in the local symbols and write out the ones which we know
5413 are going into the output file. */
5414 esym
= external_syms
;
5415 esymend
= esym
+ locsymcount
;
5416 isym
= finfo
->internal_syms
;
5417 pindex
= finfo
->indices
;
5418 ppsection
= finfo
->sections
;
5419 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5423 Elf_Internal_Sym osym
;
5425 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5428 if (elf_bad_symtab (input_bfd
))
5430 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5437 if (isym
->st_shndx
== SHN_UNDEF
)
5438 isec
= bfd_und_section_ptr
;
5439 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5440 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5441 else if (isym
->st_shndx
== SHN_ABS
)
5442 isec
= bfd_abs_section_ptr
;
5443 else if (isym
->st_shndx
== SHN_COMMON
)
5444 isec
= bfd_com_section_ptr
;
5453 /* Don't output the first, undefined, symbol. */
5454 if (esym
== external_syms
)
5457 /* If we are stripping all symbols, we don't want to output this
5459 if (finfo
->info
->strip
== strip_all
)
5462 /* We never output section symbols. Instead, we use the section
5463 symbol of the corresponding section in the output file. */
5464 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5467 /* If we are discarding all local symbols, we don't want to
5468 output this one. If we are generating a relocateable output
5469 file, then some of the local symbols may be required by
5470 relocs; we output them below as we discover that they are
5472 if (finfo
->info
->discard
== discard_all
)
5475 /* If this symbol is defined in a section which we are
5476 discarding, we don't need to keep it, but note that
5477 linker_mark is only reliable for sections that have contents.
5478 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5479 as well as linker_mark. */
5480 if (isym
->st_shndx
> 0
5481 && isym
->st_shndx
< SHN_LORESERVE
5483 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5484 || (! finfo
->info
->relocateable
5485 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5488 /* Get the name of the symbol. */
5489 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5494 /* See if we are discarding symbols with this name. */
5495 if ((finfo
->info
->strip
== strip_some
5496 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5498 || (finfo
->info
->discard
== discard_l
5499 && bfd_is_local_label_name (input_bfd
, name
)))
5502 /* If we get here, we are going to output this symbol. */
5506 /* Adjust the section index for the output file. */
5507 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5508 isec
->output_section
);
5509 if (osym
.st_shndx
== (unsigned short) -1)
5512 *pindex
= bfd_get_symcount (output_bfd
);
5514 /* ELF symbols in relocateable files are section relative, but
5515 in executable files they are virtual addresses. Note that
5516 this code assumes that all ELF sections have an associated
5517 BFD section with a reasonable value for output_offset; below
5518 we assume that they also have a reasonable value for
5519 output_section. Any special sections must be set up to meet
5520 these requirements. */
5521 osym
.st_value
+= isec
->output_offset
;
5522 if (! finfo
->info
->relocateable
)
5523 osym
.st_value
+= isec
->output_section
->vma
;
5525 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5529 /* Relocate the contents of each section. */
5530 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5534 if (! o
->linker_mark
)
5536 /* This section was omitted from the link. */
5540 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5541 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5544 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5546 /* Section was created by elf_link_create_dynamic_sections
5551 /* Get the contents of the section. They have been cached by a
5552 relaxation routine. Note that o is a section in an input
5553 file, so the contents field will not have been set by any of
5554 the routines which work on output files. */
5555 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5556 contents
= elf_section_data (o
)->this_hdr
.contents
;
5559 contents
= finfo
->contents
;
5560 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5561 (file_ptr
) 0, o
->_raw_size
))
5565 if ((o
->flags
& SEC_RELOC
) != 0)
5567 Elf_Internal_Rela
*internal_relocs
;
5569 /* Get the swapped relocs. */
5570 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5571 (input_bfd
, o
, finfo
->external_relocs
,
5572 finfo
->internal_relocs
, false));
5573 if (internal_relocs
== NULL
5574 && o
->reloc_count
> 0)
5577 /* Relocate the section by invoking a back end routine.
5579 The back end routine is responsible for adjusting the
5580 section contents as necessary, and (if using Rela relocs
5581 and generating a relocateable output file) adjusting the
5582 reloc addend as necessary.
5584 The back end routine does not have to worry about setting
5585 the reloc address or the reloc symbol index.
5587 The back end routine is given a pointer to the swapped in
5588 internal symbols, and can access the hash table entries
5589 for the external symbols via elf_sym_hashes (input_bfd).
5591 When generating relocateable output, the back end routine
5592 must handle STB_LOCAL/STT_SECTION symbols specially. The
5593 output symbol is going to be a section symbol
5594 corresponding to the output section, which will require
5595 the addend to be adjusted. */
5597 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5598 input_bfd
, o
, contents
,
5600 finfo
->internal_syms
,
5604 if (finfo
->info
->relocateable
|| finfo
->info
->emitrelocations
)
5606 Elf_Internal_Rela
*irela
;
5607 Elf_Internal_Rela
*irelaend
;
5608 struct elf_link_hash_entry
**rel_hash
;
5609 Elf_Internal_Shdr
*input_rel_hdr
;
5611 /* Adjust the reloc addresses and symbol indices. */
5613 irela
= internal_relocs
;
5615 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5616 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5617 + elf_section_data (o
->output_section
)->rel_count
5618 + elf_section_data (o
->output_section
)->rel_count2
);
5619 for (; irela
< irelaend
; irela
++, rel_hash
++)
5621 unsigned long r_symndx
;
5622 Elf_Internal_Sym
*isym
;
5625 irela
->r_offset
+= o
->output_offset
;
5627 /* Relocs in an executable have to be virtual addresses. */
5628 if (finfo
->info
->emitrelocations
)
5629 irela
->r_offset
+= o
->output_section
->vma
;
5631 r_symndx
= ELF_R_SYM (irela
->r_info
);
5636 if (r_symndx
>= locsymcount
5637 || (elf_bad_symtab (input_bfd
)
5638 && finfo
->sections
[r_symndx
] == NULL
))
5640 struct elf_link_hash_entry
*rh
;
5643 /* This is a reloc against a global symbol. We
5644 have not yet output all the local symbols, so
5645 we do not know the symbol index of any global
5646 symbol. We set the rel_hash entry for this
5647 reloc to point to the global hash table entry
5648 for this symbol. The symbol index is then
5649 set at the end of elf_bfd_final_link. */
5650 indx
= r_symndx
- extsymoff
;
5651 rh
= elf_sym_hashes (input_bfd
)[indx
];
5652 while (rh
->root
.type
== bfd_link_hash_indirect
5653 || rh
->root
.type
== bfd_link_hash_warning
)
5654 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5656 /* Setting the index to -2 tells
5657 elf_link_output_extsym that this symbol is
5659 BFD_ASSERT (rh
->indx
< 0);
5667 /* This is a reloc against a local symbol. */
5670 isym
= finfo
->internal_syms
+ r_symndx
;
5671 sec
= finfo
->sections
[r_symndx
];
5672 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5674 /* I suppose the backend ought to fill in the
5675 section of any STT_SECTION symbol against a
5676 processor specific section. If we have
5677 discarded a section, the output_section will
5678 be the absolute section. */
5680 && (bfd_is_abs_section (sec
)
5681 || (sec
->output_section
!= NULL
5682 && bfd_is_abs_section (sec
->output_section
))))
5684 else if (sec
== NULL
|| sec
->owner
== NULL
)
5686 bfd_set_error (bfd_error_bad_value
);
5691 r_symndx
= sec
->output_section
->target_index
;
5692 BFD_ASSERT (r_symndx
!= 0);
5697 if (finfo
->indices
[r_symndx
] == -1)
5703 if (finfo
->info
->strip
== strip_all
)
5705 /* You can't do ld -r -s. */
5706 bfd_set_error (bfd_error_invalid_operation
);
5710 /* This symbol was skipped earlier, but
5711 since it is needed by a reloc, we
5712 must output it now. */
5713 link
= symtab_hdr
->sh_link
;
5714 name
= bfd_elf_string_from_elf_section (input_bfd
,
5720 osec
= sec
->output_section
;
5722 _bfd_elf_section_from_bfd_section (output_bfd
,
5724 if (isym
->st_shndx
== (unsigned short) -1)
5727 isym
->st_value
+= sec
->output_offset
;
5728 if (! finfo
->info
->relocateable
)
5729 isym
->st_value
+= osec
->vma
;
5731 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5733 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5737 r_symndx
= finfo
->indices
[r_symndx
];
5740 irela
->r_info
= ELF_R_INFO (r_symndx
,
5741 ELF_R_TYPE (irela
->r_info
));
5744 /* Swap out the relocs. */
5745 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5746 elf_link_output_relocs (output_bfd
, o
,
5750 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5751 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5753 elf_link_output_relocs (output_bfd
, o
,
5759 /* Write out the modified section contents. */
5760 if (elf_section_data (o
)->stab_info
== NULL
)
5762 if (! (o
->flags
& SEC_EXCLUDE
) &&
5763 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5764 contents
, o
->output_offset
,
5765 (o
->_cooked_size
!= 0
5772 if (! (_bfd_write_section_stabs
5773 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5774 o
, &elf_section_data (o
)->stab_info
, contents
)))
5782 /* Generate a reloc when linking an ELF file. This is a reloc
5783 requested by the linker, and does come from any input file. This
5784 is used to build constructor and destructor tables when linking
5788 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5790 struct bfd_link_info
*info
;
5791 asection
*output_section
;
5792 struct bfd_link_order
*link_order
;
5794 reloc_howto_type
*howto
;
5798 struct elf_link_hash_entry
**rel_hash_ptr
;
5799 Elf_Internal_Shdr
*rel_hdr
;
5800 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
5802 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5805 bfd_set_error (bfd_error_bad_value
);
5809 addend
= link_order
->u
.reloc
.p
->addend
;
5811 /* Figure out the symbol index. */
5812 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5813 + elf_section_data (output_section
)->rel_count
5814 + elf_section_data (output_section
)->rel_count2
);
5815 if (link_order
->type
== bfd_section_reloc_link_order
)
5817 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5818 BFD_ASSERT (indx
!= 0);
5819 *rel_hash_ptr
= NULL
;
5823 struct elf_link_hash_entry
*h
;
5825 /* Treat a reloc against a defined symbol as though it were
5826 actually against the section. */
5827 h
= ((struct elf_link_hash_entry
*)
5828 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5829 link_order
->u
.reloc
.p
->u
.name
,
5830 false, false, true));
5832 && (h
->root
.type
== bfd_link_hash_defined
5833 || h
->root
.type
== bfd_link_hash_defweak
))
5837 section
= h
->root
.u
.def
.section
;
5838 indx
= section
->output_section
->target_index
;
5839 *rel_hash_ptr
= NULL
;
5840 /* It seems that we ought to add the symbol value to the
5841 addend here, but in practice it has already been added
5842 because it was passed to constructor_callback. */
5843 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5847 /* Setting the index to -2 tells elf_link_output_extsym that
5848 this symbol is used by a reloc. */
5855 if (! ((*info
->callbacks
->unattached_reloc
)
5856 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5857 (asection
*) NULL
, (bfd_vma
) 0)))
5863 /* If this is an inplace reloc, we must write the addend into the
5865 if (howto
->partial_inplace
&& addend
!= 0)
5868 bfd_reloc_status_type rstat
;
5872 size
= bfd_get_reloc_size (howto
);
5873 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5874 if (buf
== (bfd_byte
*) NULL
)
5876 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5882 case bfd_reloc_outofrange
:
5884 case bfd_reloc_overflow
:
5885 if (! ((*info
->callbacks
->reloc_overflow
)
5887 (link_order
->type
== bfd_section_reloc_link_order
5888 ? bfd_section_name (output_bfd
,
5889 link_order
->u
.reloc
.p
->u
.section
)
5890 : link_order
->u
.reloc
.p
->u
.name
),
5891 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5899 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5900 (file_ptr
) link_order
->offset
, size
);
5906 /* The address of a reloc is relative to the section in a
5907 relocateable file, and is a virtual address in an executable
5909 offset
= link_order
->offset
;
5910 if (! info
->relocateable
)
5911 offset
+= output_section
->vma
;
5913 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5915 if (rel_hdr
->sh_type
== SHT_REL
)
5917 Elf_Internal_Rel irel
;
5918 Elf_External_Rel
*erel
;
5920 irel
.r_offset
= offset
;
5921 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5922 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5923 + elf_section_data (output_section
)->rel_count
);
5924 if (bed
->s
->swap_reloc_out
)
5925 (*bed
->s
->swap_reloc_out
) (output_bfd
, &irel
, (bfd_byte
*) erel
);
5927 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5931 Elf_Internal_Rela irela
;
5932 Elf_External_Rela
*erela
;
5934 irela
.r_offset
= offset
;
5935 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5936 irela
.r_addend
= addend
;
5937 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5938 + elf_section_data (output_section
)->rel_count
);
5939 if (bed
->s
->swap_reloca_out
)
5940 (*bed
->s
->swap_reloca_out
) (output_bfd
, &irela
, (bfd_byte
*) erela
);
5942 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5945 ++elf_section_data (output_section
)->rel_count
;
5951 /* Allocate a pointer to live in a linker created section. */
5954 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5956 struct bfd_link_info
*info
;
5957 elf_linker_section_t
*lsect
;
5958 struct elf_link_hash_entry
*h
;
5959 const Elf_Internal_Rela
*rel
;
5961 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5962 elf_linker_section_pointers_t
*linker_section_ptr
;
5963 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5965 BFD_ASSERT (lsect
!= NULL
);
5967 /* Is this a global symbol? */
5970 /* Has this symbol already been allocated, if so, our work is done */
5971 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5976 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5977 /* Make sure this symbol is output as a dynamic symbol. */
5978 if (h
->dynindx
== -1)
5980 if (! elf_link_record_dynamic_symbol (info
, h
))
5984 if (lsect
->rel_section
)
5985 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5988 else /* Allocation of a pointer to a local symbol */
5990 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5992 /* Allocate a table to hold the local symbols if first time */
5995 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5996 register unsigned int i
;
5998 ptr
= (elf_linker_section_pointers_t
**)
5999 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
6004 elf_local_ptr_offsets (abfd
) = ptr
;
6005 for (i
= 0; i
< num_symbols
; i
++)
6006 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
6009 /* Has this symbol already been allocated, if so, our work is done */
6010 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
6015 ptr_linker_section_ptr
= &ptr
[r_symndx
];
6019 /* If we are generating a shared object, we need to
6020 output a R_<xxx>_RELATIVE reloc so that the
6021 dynamic linker can adjust this GOT entry. */
6022 BFD_ASSERT (lsect
->rel_section
!= NULL
);
6023 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
6027 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
6028 from internal memory. */
6029 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
6030 linker_section_ptr
= (elf_linker_section_pointers_t
*)
6031 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
6033 if (!linker_section_ptr
)
6036 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
6037 linker_section_ptr
->addend
= rel
->r_addend
;
6038 linker_section_ptr
->which
= lsect
->which
;
6039 linker_section_ptr
->written_address_p
= false;
6040 *ptr_linker_section_ptr
= linker_section_ptr
;
6043 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
6045 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
6046 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
6047 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
6048 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
6050 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
6052 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
6053 lsect
->sym_hash
->root
.root
.string
,
6054 (long)ARCH_SIZE
/ 8,
6055 (long)lsect
->sym_hash
->root
.u
.def
.value
);
6061 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
6063 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
6066 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
6067 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
6075 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
6078 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
6081 /* Fill in the address for a pointer generated in alinker section. */
6084 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
6087 struct bfd_link_info
*info
;
6088 elf_linker_section_t
*lsect
;
6089 struct elf_link_hash_entry
*h
;
6091 const Elf_Internal_Rela
*rel
;
6094 elf_linker_section_pointers_t
*linker_section_ptr
;
6096 BFD_ASSERT (lsect
!= NULL
);
6098 if (h
!= NULL
) /* global symbol */
6100 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
6104 BFD_ASSERT (linker_section_ptr
!= NULL
);
6106 if (! elf_hash_table (info
)->dynamic_sections_created
6109 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
6111 /* This is actually a static link, or it is a
6112 -Bsymbolic link and the symbol is defined
6113 locally. We must initialize this entry in the
6116 When doing a dynamic link, we create a .rela.<xxx>
6117 relocation entry to initialize the value. This
6118 is done in the finish_dynamic_symbol routine. */
6119 if (!linker_section_ptr
->written_address_p
)
6121 linker_section_ptr
->written_address_p
= true;
6122 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6123 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6127 else /* local symbol */
6129 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6130 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
6131 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
6132 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
6136 BFD_ASSERT (linker_section_ptr
!= NULL
);
6138 /* Write out pointer if it hasn't been rewritten out before */
6139 if (!linker_section_ptr
->written_address_p
)
6141 linker_section_ptr
->written_address_p
= true;
6142 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6143 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6147 asection
*srel
= lsect
->rel_section
;
6148 Elf_Internal_Rela outrel
;
6150 /* We need to generate a relative reloc for the dynamic linker. */
6152 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
6155 BFD_ASSERT (srel
!= NULL
);
6157 outrel
.r_offset
= (lsect
->section
->output_section
->vma
6158 + lsect
->section
->output_offset
6159 + linker_section_ptr
->offset
);
6160 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
6161 outrel
.r_addend
= 0;
6162 elf_swap_reloca_out (output_bfd
, &outrel
,
6163 (((Elf_External_Rela
*)
6164 lsect
->section
->contents
)
6165 + elf_section_data (lsect
->section
)->rel_count
));
6166 ++elf_section_data (lsect
->section
)->rel_count
;
6171 relocation
= (lsect
->section
->output_offset
6172 + linker_section_ptr
->offset
6173 - lsect
->hole_offset
6174 - lsect
->sym_offset
);
6177 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6178 lsect
->name
, (long)relocation
, (long)relocation
);
6181 /* Subtract out the addend, because it will get added back in by the normal
6183 return relocation
- linker_section_ptr
->addend
;
6186 /* Garbage collect unused sections. */
6188 static boolean elf_gc_mark
6189 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
6190 asection
* (*gc_mark_hook
)
6191 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6192 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
6194 static boolean elf_gc_sweep
6195 PARAMS ((struct bfd_link_info
*info
,
6196 boolean (*gc_sweep_hook
)
6197 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6198 const Elf_Internal_Rela
*relocs
))));
6200 static boolean elf_gc_sweep_symbol
6201 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
6203 static boolean elf_gc_allocate_got_offsets
6204 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
6206 static boolean elf_gc_propagate_vtable_entries_used
6207 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6209 static boolean elf_gc_smash_unused_vtentry_relocs
6210 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6212 /* The mark phase of garbage collection. For a given section, mark
6213 it, and all the sections which define symbols to which it refers. */
6216 elf_gc_mark (info
, sec
, gc_mark_hook
)
6217 struct bfd_link_info
*info
;
6219 asection
* (*gc_mark_hook
)
6220 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6221 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
6227 /* Look through the section relocs. */
6229 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
6231 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
6232 Elf_Internal_Shdr
*symtab_hdr
;
6233 struct elf_link_hash_entry
**sym_hashes
;
6236 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
6237 bfd
*input_bfd
= sec
->owner
;
6238 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
6240 /* GCFIXME: how to arrange so that relocs and symbols are not
6241 reread continually? */
6243 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6244 sym_hashes
= elf_sym_hashes (input_bfd
);
6246 /* Read the local symbols. */
6247 if (elf_bad_symtab (input_bfd
))
6249 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6253 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
6254 if (symtab_hdr
->contents
)
6255 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6256 else if (nlocsyms
== 0)
6260 locsyms
= freesyms
=
6261 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
6262 if (freesyms
== NULL
6263 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6264 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
6265 nlocsyms
, input_bfd
)
6266 != nlocsyms
* sizeof (Elf_External_Sym
)))
6273 /* Read the relocations. */
6274 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6275 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
6276 info
->keep_memory
));
6277 if (relstart
== NULL
)
6282 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6284 for (rel
= relstart
; rel
< relend
; rel
++)
6286 unsigned long r_symndx
;
6288 struct elf_link_hash_entry
*h
;
6291 r_symndx
= ELF_R_SYM (rel
->r_info
);
6295 if (elf_bad_symtab (sec
->owner
))
6297 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6298 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
6299 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6302 h
= sym_hashes
[r_symndx
- extsymoff
];
6303 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6306 else if (r_symndx
>= nlocsyms
)
6308 h
= sym_hashes
[r_symndx
- extsymoff
];
6309 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6313 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6314 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6317 if (rsec
&& !rsec
->gc_mark
)
6318 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6326 if (!info
->keep_memory
)
6336 /* The sweep phase of garbage collection. Remove all garbage sections. */
6339 elf_gc_sweep (info
, gc_sweep_hook
)
6340 struct bfd_link_info
*info
;
6341 boolean (*gc_sweep_hook
)
6342 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6343 const Elf_Internal_Rela
*relocs
));
6347 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6351 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6354 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6356 /* Keep special sections. Keep .debug sections. */
6357 if ((o
->flags
& SEC_LINKER_CREATED
)
6358 || (o
->flags
& SEC_DEBUGGING
))
6364 /* Skip sweeping sections already excluded. */
6365 if (o
->flags
& SEC_EXCLUDE
)
6368 /* Since this is early in the link process, it is simple
6369 to remove a section from the output. */
6370 o
->flags
|= SEC_EXCLUDE
;
6372 /* But we also have to update some of the relocation
6373 info we collected before. */
6375 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6377 Elf_Internal_Rela
*internal_relocs
;
6380 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6381 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6382 if (internal_relocs
== NULL
)
6385 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6387 if (!info
->keep_memory
)
6388 free (internal_relocs
);
6396 /* Remove the symbols that were in the swept sections from the dynamic
6397 symbol table. GCFIXME: Anyone know how to get them out of the
6398 static symbol table as well? */
6402 elf_link_hash_traverse (elf_hash_table (info
),
6403 elf_gc_sweep_symbol
,
6406 elf_hash_table (info
)->dynsymcount
= i
;
6412 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6415 elf_gc_sweep_symbol (h
, idxptr
)
6416 struct elf_link_hash_entry
*h
;
6419 int *idx
= (int *) idxptr
;
6421 if (h
->dynindx
!= -1
6422 && ((h
->root
.type
!= bfd_link_hash_defined
6423 && h
->root
.type
!= bfd_link_hash_defweak
)
6424 || h
->root
.u
.def
.section
->gc_mark
))
6425 h
->dynindx
= (*idx
)++;
6430 /* Propogate collected vtable information. This is called through
6431 elf_link_hash_traverse. */
6434 elf_gc_propagate_vtable_entries_used (h
, okp
)
6435 struct elf_link_hash_entry
*h
;
6438 /* Those that are not vtables. */
6439 if (h
->vtable_parent
== NULL
)
6442 /* Those vtables that do not have parents, we cannot merge. */
6443 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6446 /* If we've already been done, exit. */
6447 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6450 /* Make sure the parent's table is up to date. */
6451 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6453 if (h
->vtable_entries_used
== NULL
)
6455 /* None of this table's entries were referenced. Re-use the
6457 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6458 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6465 /* Or the parent's entries into ours. */
6466 cu
= h
->vtable_entries_used
;
6468 pu
= h
->vtable_parent
->vtable_entries_used
;
6471 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6474 if (*pu
) *cu
= true;
6484 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6485 struct elf_link_hash_entry
*h
;
6489 bfd_vma hstart
, hend
;
6490 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6491 struct elf_backend_data
*bed
;
6493 /* Take care of both those symbols that do not describe vtables as
6494 well as those that are not loaded. */
6495 if (h
->vtable_parent
== NULL
)
6498 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6499 || h
->root
.type
== bfd_link_hash_defweak
);
6501 sec
= h
->root
.u
.def
.section
;
6502 hstart
= h
->root
.u
.def
.value
;
6503 hend
= hstart
+ h
->size
;
6505 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6506 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6508 return *(boolean
*)okp
= false;
6509 bed
= get_elf_backend_data (sec
->owner
);
6510 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6512 for (rel
= relstart
; rel
< relend
; ++rel
)
6513 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6515 /* If the entry is in use, do nothing. */
6516 if (h
->vtable_entries_used
6517 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6519 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6520 if (h
->vtable_entries_used
[entry
])
6523 /* Otherwise, kill it. */
6524 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6530 /* Do mark and sweep of unused sections. */
6533 elf_gc_sections (abfd
, info
)
6535 struct bfd_link_info
*info
;
6539 asection
* (*gc_mark_hook
)
6540 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6541 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6543 if (!get_elf_backend_data (abfd
)->can_gc_sections
6544 || info
->relocateable
|| info
->emitrelocations
6545 || elf_hash_table (info
)->dynamic_sections_created
)
6548 /* Apply transitive closure to the vtable entry usage info. */
6549 elf_link_hash_traverse (elf_hash_table (info
),
6550 elf_gc_propagate_vtable_entries_used
,
6555 /* Kill the vtable relocations that were not used. */
6556 elf_link_hash_traverse (elf_hash_table (info
),
6557 elf_gc_smash_unused_vtentry_relocs
,
6562 /* Grovel through relocs to find out who stays ... */
6564 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6565 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6569 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6572 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6574 if (o
->flags
& SEC_KEEP
)
6575 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6580 /* ... and mark SEC_EXCLUDE for those that go. */
6581 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6587 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6590 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6593 struct elf_link_hash_entry
*h
;
6596 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6597 struct elf_link_hash_entry
**search
, *child
;
6598 bfd_size_type extsymcount
;
6600 /* The sh_info field of the symtab header tells us where the
6601 external symbols start. We don't care about the local symbols at
6603 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6604 if (!elf_bad_symtab (abfd
))
6605 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6607 sym_hashes
= elf_sym_hashes (abfd
);
6608 sym_hashes_end
= sym_hashes
+ extsymcount
;
6610 /* Hunt down the child symbol, which is in this section at the same
6611 offset as the relocation. */
6612 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6614 if ((child
= *search
) != NULL
6615 && (child
->root
.type
== bfd_link_hash_defined
6616 || child
->root
.type
== bfd_link_hash_defweak
)
6617 && child
->root
.u
.def
.section
== sec
6618 && child
->root
.u
.def
.value
== offset
)
6622 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6623 bfd_get_filename (abfd
), sec
->name
,
6624 (unsigned long)offset
);
6625 bfd_set_error (bfd_error_invalid_operation
);
6631 /* This *should* only be the absolute section. It could potentially
6632 be that someone has defined a non-global vtable though, which
6633 would be bad. It isn't worth paging in the local symbols to be
6634 sure though; that case should simply be handled by the assembler. */
6636 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6639 child
->vtable_parent
= h
;
6644 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6647 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6648 bfd
*abfd ATTRIBUTE_UNUSED
;
6649 asection
*sec ATTRIBUTE_UNUSED
;
6650 struct elf_link_hash_entry
*h
;
6653 if (addend
>= h
->vtable_entries_size
)
6656 boolean
*ptr
= h
->vtable_entries_used
;
6658 /* While the symbol is undefined, we have to be prepared to handle
6660 if (h
->root
.type
== bfd_link_hash_undefined
)
6667 /* Oops! We've got a reference past the defined end of
6668 the table. This is probably a bug -- shall we warn? */
6673 /* Allocate one extra entry for use as a "done" flag for the
6674 consolidation pass. */
6675 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof (boolean
);
6679 ptr
= bfd_realloc (ptr
- 1, bytes
);
6685 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof (boolean
);
6686 memset (((char *)ptr
) + oldbytes
, 0, bytes
- oldbytes
);
6690 ptr
= bfd_zmalloc (bytes
);
6695 /* And arrange for that done flag to be at index -1. */
6696 h
->vtable_entries_used
= ptr
+ 1;
6697 h
->vtable_entries_size
= size
;
6700 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6705 /* And an accompanying bit to work out final got entry offsets once
6706 we're done. Should be called from final_link. */
6709 elf_gc_common_finalize_got_offsets (abfd
, info
)
6711 struct bfd_link_info
*info
;
6714 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6717 /* The GOT offset is relative to the .got section, but the GOT header is
6718 put into the .got.plt section, if the backend uses it. */
6719 if (bed
->want_got_plt
)
6722 gotoff
= bed
->got_header_size
;
6724 /* Do the local .got entries first. */
6725 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6727 bfd_signed_vma
*local_got
;
6728 bfd_size_type j
, locsymcount
;
6729 Elf_Internal_Shdr
*symtab_hdr
;
6731 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
6734 local_got
= elf_local_got_refcounts (i
);
6738 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6739 if (elf_bad_symtab (i
))
6740 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6742 locsymcount
= symtab_hdr
->sh_info
;
6744 for (j
= 0; j
< locsymcount
; ++j
)
6746 if (local_got
[j
] > 0)
6748 local_got
[j
] = gotoff
;
6749 gotoff
+= ARCH_SIZE
/ 8;
6752 local_got
[j
] = (bfd_vma
) -1;
6756 /* Then the global .got entries. .plt refcounts are handled by
6757 adjust_dynamic_symbol */
6758 elf_link_hash_traverse (elf_hash_table (info
),
6759 elf_gc_allocate_got_offsets
,
6764 /* We need a special top-level link routine to convert got reference counts
6765 to real got offsets. */
6768 elf_gc_allocate_got_offsets (h
, offarg
)
6769 struct elf_link_hash_entry
*h
;
6772 bfd_vma
*off
= (bfd_vma
*) offarg
;
6774 if (h
->got
.refcount
> 0)
6776 h
->got
.offset
= off
[0];
6777 off
[0] += ARCH_SIZE
/ 8;
6780 h
->got
.offset
= (bfd_vma
) -1;
6785 /* Many folk need no more in the way of final link than this, once
6786 got entry reference counting is enabled. */
6789 elf_gc_common_final_link (abfd
, info
)
6791 struct bfd_link_info
*info
;
6793 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6796 /* Invoke the regular ELF backend linker to do all the work. */
6797 return elf_bfd_final_link (abfd
, info
);
6800 /* This function will be called though elf_link_hash_traverse to store
6801 all hash value of the exported symbols in an array. */
6804 elf_collect_hash_codes (h
, data
)
6805 struct elf_link_hash_entry
*h
;
6808 unsigned long **valuep
= (unsigned long **) data
;
6814 /* Ignore indirect symbols. These are added by the versioning code. */
6815 if (h
->dynindx
== -1)
6818 name
= h
->root
.root
.string
;
6819 p
= strchr (name
, ELF_VER_CHR
);
6822 alc
= bfd_malloc (p
- name
+ 1);
6823 memcpy (alc
, name
, p
- name
);
6824 alc
[p
- name
] = '\0';
6828 /* Compute the hash value. */
6829 ha
= bfd_elf_hash (name
);
6831 /* Store the found hash value in the array given as the argument. */
6834 /* And store it in the struct so that we can put it in the hash table
6836 h
->elf_hash_value
= ha
;