2 Copyright 1995, 1996 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 static boolean elf_link_add_object_symbols
23 PARAMS ((bfd
*, struct bfd_link_info
*));
24 static boolean elf_link_add_archive_symbols
25 PARAMS ((bfd
*, struct bfd_link_info
*));
26 static boolean elf_export_symbol
27 PARAMS ((struct elf_link_hash_entry
*, PTR
));
28 static boolean elf_adjust_dynamic_symbol
29 PARAMS ((struct elf_link_hash_entry
*, PTR
));
31 /* This struct is used to pass information to routines called via
32 elf_link_hash_traverse which must return failure. */
34 struct elf_info_failed
37 struct bfd_link_info
*info
;
40 /* Given an ELF BFD, add symbols to the global hash table as
44 elf_bfd_link_add_symbols (abfd
, info
)
46 struct bfd_link_info
*info
;
48 switch (bfd_get_format (abfd
))
51 return elf_link_add_object_symbols (abfd
, info
);
53 return elf_link_add_archive_symbols (abfd
, info
);
55 bfd_set_error (bfd_error_wrong_format
);
61 /* Add symbols from an ELF archive file to the linker hash table. We
62 don't use _bfd_generic_link_add_archive_symbols because of a
63 problem which arises on UnixWare. The UnixWare libc.so is an
64 archive which includes an entry libc.so.1 which defines a bunch of
65 symbols. The libc.so archive also includes a number of other
66 object files, which also define symbols, some of which are the same
67 as those defined in libc.so.1. Correct linking requires that we
68 consider each object file in turn, and include it if it defines any
69 symbols we need. _bfd_generic_link_add_archive_symbols does not do
70 this; it looks through the list of undefined symbols, and includes
71 any object file which defines them. When this algorithm is used on
72 UnixWare, it winds up pulling in libc.so.1 early and defining a
73 bunch of symbols. This means that some of the other objects in the
74 archive are not included in the link, which is incorrect since they
75 precede libc.so.1 in the archive.
77 Fortunately, ELF archive handling is simpler than that done by
78 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
79 oddities. In ELF, if we find a symbol in the archive map, and the
80 symbol is currently undefined, we know that we must pull in that
83 Unfortunately, we do have to make multiple passes over the symbol
84 table until nothing further is resolved. */
87 elf_link_add_archive_symbols (abfd
, info
)
89 struct bfd_link_info
*info
;
92 boolean
*defined
= NULL
;
93 boolean
*included
= NULL
;
97 if (! bfd_has_map (abfd
))
99 /* An empty archive is a special case. */
100 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
102 bfd_set_error (bfd_error_no_armap
);
106 /* Keep track of all symbols we know to be already defined, and all
107 files we know to be already included. This is to speed up the
108 second and subsequent passes. */
109 c
= bfd_ardata (abfd
)->symdef_count
;
112 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
113 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
114 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
116 memset (defined
, 0, c
* sizeof (boolean
));
117 memset (included
, 0, c
* sizeof (boolean
));
119 symdefs
= bfd_ardata (abfd
)->symdefs
;
132 symdefend
= symdef
+ c
;
133 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
135 struct elf_link_hash_entry
*h
;
137 struct bfd_link_hash_entry
*undefs_tail
;
140 if (defined
[i
] || included
[i
])
142 if (symdef
->file_offset
== last
)
148 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
149 false, false, false);
150 if (h
== (struct elf_link_hash_entry
*) NULL
)
152 if (h
->root
.type
!= bfd_link_hash_undefined
)
154 if (h
->root
.type
!= bfd_link_hash_undefweak
)
159 /* We need to include this archive member. */
161 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
162 if (element
== (bfd
*) NULL
)
165 if (! bfd_check_format (element
, bfd_object
))
168 /* Doublecheck that we have not included this object
169 already--it should be impossible, but there may be
170 something wrong with the archive. */
171 if (element
->archive_pass
!= 0)
173 bfd_set_error (bfd_error_bad_value
);
176 element
->archive_pass
= 1;
178 undefs_tail
= info
->hash
->undefs_tail
;
180 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
183 if (! elf_link_add_object_symbols (element
, info
))
186 /* If there are any new undefined symbols, we need to make
187 another pass through the archive in order to see whether
188 they can be defined. FIXME: This isn't perfect, because
189 common symbols wind up on undefs_tail and because an
190 undefined symbol which is defined later on in this pass
191 does not require another pass. This isn't a bug, but it
192 does make the code less efficient than it could be. */
193 if (undefs_tail
!= info
->hash
->undefs_tail
)
196 /* Look backward to mark all symbols from this object file
197 which we have already seen in this pass. */
201 included
[mark
] = true;
206 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
208 /* We mark subsequent symbols from this object file as we go
209 on through the loop. */
210 last
= symdef
->file_offset
;
221 if (defined
!= (boolean
*) NULL
)
223 if (included
!= (boolean
*) NULL
)
228 /* Add symbols from an ELF object file to the linker hash table. */
231 elf_link_add_object_symbols (abfd
, info
)
233 struct bfd_link_info
*info
;
235 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
236 const Elf_Internal_Sym
*,
237 const char **, flagword
*,
238 asection
**, bfd_vma
*));
239 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
240 asection
*, const Elf_Internal_Rela
*));
242 Elf_Internal_Shdr
*hdr
;
246 Elf_External_Sym
*buf
= NULL
;
247 struct elf_link_hash_entry
**sym_hash
;
249 Elf_External_Dyn
*dynbuf
= NULL
;
250 struct elf_link_hash_entry
*weaks
;
251 Elf_External_Sym
*esym
;
252 Elf_External_Sym
*esymend
;
254 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
255 collect
= get_elf_backend_data (abfd
)->collect
;
257 /* As a GNU extension, any input sections which are named
258 .gnu.warning.SYMBOL are treated as warning symbols for the given
259 symbol. This differs from .gnu.warning sections, which generate
260 warnings when they are included in an output file. */
265 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
269 name
= bfd_get_section_name (abfd
, s
);
270 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
275 sz
= bfd_section_size (abfd
, s
);
276 msg
= (char *) bfd_alloc (abfd
, sz
);
280 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
283 if (! (_bfd_generic_link_add_one_symbol
285 name
+ sizeof ".gnu.warning." - 1,
286 BSF_WARNING
, s
, (bfd_vma
) 0, msg
, false, collect
,
287 (struct bfd_link_hash_entry
**) NULL
)))
290 if (! info
->relocateable
)
292 /* Clobber the section size so that the warning does
293 not get copied into the output file. */
300 /* A stripped shared library might only have a dynamic symbol table,
301 not a regular symbol table. In that case we can still go ahead
302 and link using the dynamic symbol table. */
303 if (elf_onesymtab (abfd
) == 0
304 && elf_dynsymtab (abfd
) != 0)
306 elf_onesymtab (abfd
) = elf_dynsymtab (abfd
);
307 elf_tdata (abfd
)->symtab_hdr
= elf_tdata (abfd
)->dynsymtab_hdr
;
310 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
311 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
313 /* The sh_info field of the symtab header tells us where the
314 external symbols start. We don't care about the local symbols at
316 if (elf_bad_symtab (abfd
))
318 extsymcount
= symcount
;
323 extsymcount
= symcount
- hdr
->sh_info
;
324 extsymoff
= hdr
->sh_info
;
327 buf
= ((Elf_External_Sym
*)
328 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
329 if (buf
== NULL
&& extsymcount
!= 0)
332 /* We store a pointer to the hash table entry for each external
334 sym_hash
= ((struct elf_link_hash_entry
**)
336 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
337 if (sym_hash
== NULL
)
339 elf_sym_hashes (abfd
) = sym_hash
;
341 if (elf_elfheader (abfd
)->e_type
!= ET_DYN
)
345 /* If we are creating a shared library, create all the dynamic
346 sections immediately. We need to attach them to something,
347 so we attach them to this BFD, provided it is the right
348 format. FIXME: If there are no input BFD's of the same
349 format as the output, we can't make a shared library. */
351 && ! elf_hash_table (info
)->dynamic_sections_created
352 && abfd
->xvec
== info
->hash
->creator
)
354 if (! elf_link_create_dynamic_sections (abfd
, info
))
363 bfd_size_type oldsize
;
364 bfd_size_type strindex
;
368 /* You can't use -r against a dynamic object. Also, there's no
369 hope of using a dynamic object which does not exactly match
370 the format of the output file. */
371 if (info
->relocateable
372 || info
->hash
->creator
!= abfd
->xvec
)
374 bfd_set_error (bfd_error_invalid_operation
);
378 /* Find the name to use in a DT_NEEDED entry that refers to this
379 object. If the object has a DT_SONAME entry, we use it.
380 Otherwise, if the generic linker stuck something in
381 elf_dt_name, we use that. Otherwise, we just use the file
382 name. If the generic linker put a null string into
383 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
384 there is a DT_SONAME entry. */
386 name
= bfd_get_filename (abfd
);
387 if (elf_dt_name (abfd
) != NULL
)
389 name
= elf_dt_name (abfd
);
393 s
= bfd_get_section_by_name (abfd
, ".dynamic");
396 Elf_External_Dyn
*extdyn
;
397 Elf_External_Dyn
*extdynend
;
401 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
405 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
406 (file_ptr
) 0, s
->_raw_size
))
409 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
412 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
415 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
416 for (; extdyn
< extdynend
; extdyn
++)
418 Elf_Internal_Dyn dyn
;
420 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
421 if (dyn
.d_tag
== DT_SONAME
)
423 name
= bfd_elf_string_from_elf_section (abfd
, link
,
428 if (dyn
.d_tag
== DT_NEEDED
)
430 struct bfd_link_needed_list
*n
, **pn
;
433 n
= ((struct bfd_link_needed_list
*)
434 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
435 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
437 if (n
== NULL
|| fnm
== NULL
)
439 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
446 for (pn
= &elf_hash_table (info
)->needed
;
458 /* We do not want to include any of the sections in a dynamic
459 object in the output file. We hack by simply clobbering the
460 list of sections in the BFD. This could be handled more
461 cleanly by, say, a new section flag; the existing
462 SEC_NEVER_LOAD flag is not the one we want, because that one
463 still implies that the section takes up space in the output
465 abfd
->sections
= NULL
;
466 abfd
->section_count
= 0;
468 /* If this is the first dynamic object found in the link, create
469 the special sections required for dynamic linking. */
470 if (! elf_hash_table (info
)->dynamic_sections_created
)
472 if (! elf_link_create_dynamic_sections (abfd
, info
))
478 /* Add a DT_NEEDED entry for this dynamic object. */
479 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
480 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
482 if (strindex
== (bfd_size_type
) -1)
485 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
488 Elf_External_Dyn
*dyncon
, *dynconend
;
490 /* The hash table size did not change, which means that
491 the dynamic object name was already entered. If we
492 have already included this dynamic object in the
493 link, just ignore it. There is no reason to include
494 a particular dynamic object more than once. */
495 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
497 BFD_ASSERT (sdyn
!= NULL
);
499 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
500 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
502 for (; dyncon
< dynconend
; dyncon
++)
504 Elf_Internal_Dyn dyn
;
506 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
508 if (dyn
.d_tag
== DT_NEEDED
509 && dyn
.d_un
.d_val
== strindex
)
518 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
522 /* Save the SONAME, if there is one, because sometimes the
523 linker emulation code will need to know it. */
525 name
= bfd_get_filename (abfd
);
526 elf_dt_name (abfd
) = name
;
530 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
532 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
533 != extsymcount
* sizeof (Elf_External_Sym
)))
538 esymend
= buf
+ extsymcount
;
539 for (esym
= buf
; esym
< esymend
; esym
++, sym_hash
++)
541 Elf_Internal_Sym sym
;
547 struct elf_link_hash_entry
*h
;
549 boolean size_change_ok
, type_change_ok
;
552 elf_swap_symbol_in (abfd
, esym
, &sym
);
554 flags
= BSF_NO_FLAGS
;
556 value
= sym
.st_value
;
559 bind
= ELF_ST_BIND (sym
.st_info
);
560 if (bind
== STB_LOCAL
)
562 /* This should be impossible, since ELF requires that all
563 global symbols follow all local symbols, and that sh_info
564 point to the first global symbol. Unfortunatealy, Irix 5
568 else if (bind
== STB_GLOBAL
)
570 if (sym
.st_shndx
!= SHN_UNDEF
571 && sym
.st_shndx
!= SHN_COMMON
)
576 else if (bind
== STB_WEAK
)
580 /* Leave it up to the processor backend. */
583 if (sym
.st_shndx
== SHN_UNDEF
)
584 sec
= bfd_und_section_ptr
;
585 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
587 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
591 sec
= bfd_abs_section_ptr
;
593 else if (sym
.st_shndx
== SHN_ABS
)
594 sec
= bfd_abs_section_ptr
;
595 else if (sym
.st_shndx
== SHN_COMMON
)
597 sec
= bfd_com_section_ptr
;
598 /* What ELF calls the size we call the value. What ELF
599 calls the value we call the alignment. */
604 /* Leave it up to the processor backend. */
607 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
608 if (name
== (const char *) NULL
)
613 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
617 /* The hook function sets the name to NULL if this symbol
618 should be skipped for some reason. */
619 if (name
== (const char *) NULL
)
623 /* Sanity check that all possibilities were handled. */
624 if (sec
== (asection
*) NULL
)
626 bfd_set_error (bfd_error_bad_value
);
630 if (bfd_is_und_section (sec
)
631 || bfd_is_com_section (sec
))
636 size_change_ok
= false;
637 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
638 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
640 /* We need to look up the symbol now in order to get some of
641 the dynamic object handling right. We pass the hash
642 table entry in to _bfd_generic_link_add_one_symbol so
643 that it does not have to look it up again. */
644 if (! bfd_is_und_section (sec
))
645 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
648 h
= ((struct elf_link_hash_entry
*)
649 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true,
655 if (h
->root
.type
== bfd_link_hash_new
)
656 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
658 while (h
->root
.type
== bfd_link_hash_indirect
659 || h
->root
.type
== bfd_link_hash_warning
)
660 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
662 /* It's OK to change the type if it used to be a weak
664 if (h
->root
.type
== bfd_link_hash_defweak
665 || h
->root
.type
== bfd_link_hash_undefweak
)
666 type_change_ok
= true;
668 /* It's OK to change the size if it used to be a weak
669 definition, or if it used to be undefined, or if we will
670 be overriding an old definition. */
672 || h
->root
.type
== bfd_link_hash_undefined
)
673 size_change_ok
= true;
675 /* If we are looking at a dynamic object, and this is a
676 definition, we need to see if it has already been defined
677 by some other object. If it has, we want to use the
678 existing definition, and we do not want to report a
679 multiple symbol definition error; we do this by
680 clobbering sec to be bfd_und_section_ptr. We treat a
681 common symbol as a definition if the symbol in the shared
682 library is a function, since common symbols always
683 represent variables; this can cause confusion in
684 principle, but any such confusion would seem to indicate
685 an erroneous program or shared library. */
686 if (dynamic
&& definition
)
688 if (h
->root
.type
== bfd_link_hash_defined
689 || h
->root
.type
== bfd_link_hash_defweak
690 || (h
->root
.type
== bfd_link_hash_common
692 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
)))
694 sec
= bfd_und_section_ptr
;
696 size_change_ok
= true;
697 if (h
->root
.type
== bfd_link_hash_common
)
698 type_change_ok
= true;
702 /* Similarly, if we are not looking at a dynamic object, and
703 we have a definition, we want to override any definition
704 we may have from a dynamic object. Symbols from regular
705 files always take precedence over symbols from dynamic
706 objects, even if they are defined after the dynamic
707 object in the link. */
710 || (bfd_is_com_section (sec
)
711 && (h
->root
.type
== bfd_link_hash_defweak
712 || h
->type
== STT_FUNC
)))
713 && (h
->root
.type
== bfd_link_hash_defined
714 || h
->root
.type
== bfd_link_hash_defweak
)
715 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
716 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
717 == bfd_target_elf_flavour
)
718 && (elf_elfheader (h
->root
.u
.def
.section
->owner
)->e_type
721 /* Change the hash table entry to undefined, and let
722 _bfd_generic_link_add_one_symbol do the right thing
723 with the new definition. */
724 h
->root
.type
= bfd_link_hash_undefined
;
725 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
726 size_change_ok
= true;
727 if (bfd_is_com_section (sec
))
728 type_change_ok
= true;
732 if (! (_bfd_generic_link_add_one_symbol
733 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
734 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
738 while (h
->root
.type
== bfd_link_hash_indirect
739 || h
->root
.type
== bfd_link_hash_warning
)
740 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
746 && (flags
& BSF_WEAK
) != 0
747 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
748 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
749 && h
->weakdef
== NULL
)
751 /* Keep a list of all weak defined non function symbols from
752 a dynamic object, using the weakdef field. Later in this
753 function we will set the weakdef field to the correct
754 value. We only put non-function symbols from dynamic
755 objects on this list, because that happens to be the only
756 time we need to know the normal symbol corresponding to a
757 weak symbol, and the information is time consuming to
758 figure out. If the weakdef field is not already NULL,
759 then this symbol was already defined by some previous
760 dynamic object, and we will be using that previous
761 definition anyhow. */
768 /* Get the alignment of a common symbol. */
769 if (sym
.st_shndx
== SHN_COMMON
770 && h
->root
.type
== bfd_link_hash_common
)
771 h
->root
.u
.c
.p
->alignment_power
= bfd_log2 (sym
.st_value
);
773 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
779 /* Remember the symbol size and type. */
781 && (definition
|| h
->size
== 0))
783 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
784 (*_bfd_error_handler
)
785 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
786 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
787 bfd_get_filename (abfd
));
789 h
->size
= sym
.st_size
;
791 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
792 && (definition
|| h
->type
== STT_NOTYPE
))
794 if (h
->type
!= STT_NOTYPE
795 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
797 (*_bfd_error_handler
)
798 ("Warning: type of symbol `%s' changed from %d to %d in %s",
799 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
800 bfd_get_filename (abfd
));
802 h
->type
= ELF_ST_TYPE (sym
.st_info
);
805 if (sym
.st_other
!= 0
806 && (definition
|| h
->other
== 0))
807 h
->other
= sym
.st_other
;
809 /* Set a flag in the hash table entry indicating the type of
810 reference or definition we just found. Keep a count of
811 the number of dynamic symbols we find. A dynamic symbol
812 is one which is referenced or defined by both a regular
813 object and a shared object. */
814 old_flags
= h
->elf_link_hash_flags
;
819 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
821 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
823 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
824 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
830 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
832 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
833 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
834 | ELF_LINK_HASH_REF_REGULAR
)) != 0
835 || (h
->weakdef
!= NULL
837 && h
->weakdef
->dynindx
!= -1))
841 h
->elf_link_hash_flags
|= new_flag
;
842 if (dynsym
&& h
->dynindx
== -1)
844 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
846 if (h
->weakdef
!= NULL
848 && h
->weakdef
->dynindx
== -1)
850 if (! _bfd_elf_link_record_dynamic_symbol (info
,
858 /* Now set the weakdefs field correctly for all the weak defined
859 symbols we found. The only way to do this is to search all the
860 symbols. Since we only need the information for non functions in
861 dynamic objects, that's the only time we actually put anything on
862 the list WEAKS. We need this information so that if a regular
863 object refers to a symbol defined weakly in a dynamic object, the
864 real symbol in the dynamic object is also put in the dynamic
865 symbols; we also must arrange for both symbols to point to the
866 same memory location. We could handle the general case of symbol
867 aliasing, but a general symbol alias can only be generated in
868 assembler code, handling it correctly would be very time
869 consuming, and other ELF linkers don't handle general aliasing
871 while (weaks
!= NULL
)
873 struct elf_link_hash_entry
*hlook
;
876 struct elf_link_hash_entry
**hpp
;
877 struct elf_link_hash_entry
**hppend
;
880 weaks
= hlook
->weakdef
;
881 hlook
->weakdef
= NULL
;
883 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
884 || hlook
->root
.type
== bfd_link_hash_defweak
885 || hlook
->root
.type
== bfd_link_hash_common
886 || hlook
->root
.type
== bfd_link_hash_indirect
);
887 slook
= hlook
->root
.u
.def
.section
;
888 vlook
= hlook
->root
.u
.def
.value
;
890 hpp
= elf_sym_hashes (abfd
);
891 hppend
= hpp
+ extsymcount
;
892 for (; hpp
< hppend
; hpp
++)
894 struct elf_link_hash_entry
*h
;
897 if (h
!= NULL
&& h
!= hlook
898 && h
->root
.type
== bfd_link_hash_defined
899 && h
->root
.u
.def
.section
== slook
900 && h
->root
.u
.def
.value
== vlook
)
904 /* If the weak definition is in the list of dynamic
905 symbols, make sure the real definition is put there
907 if (hlook
->dynindx
!= -1
910 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
914 /* If the real definition is in the list of dynamic
915 symbols, make sure the weak definition is put there
916 as well. If we don't do this, then the dynamic
917 loader might not merge the entries for the real
918 definition and the weak definition. */
920 && hlook
->dynindx
== -1)
922 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
937 /* If this object is the same format as the output object, and it is
938 not a shared library, then let the backend look through the
941 This is required to build global offset table entries and to
942 arrange for dynamic relocs. It is not required for the
943 particular common case of linking non PIC code, even when linking
944 against shared libraries, but unfortunately there is no way of
945 knowing whether an object file has been compiled PIC or not.
946 Looking through the relocs is not particularly time consuming.
947 The problem is that we must either (1) keep the relocs in memory,
948 which causes the linker to require additional runtime memory or
949 (2) read the relocs twice from the input file, which wastes time.
950 This would be a good case for using mmap.
952 I have no idea how to handle linking PIC code into a file of a
953 different format. It probably can't be done. */
954 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
956 && abfd
->xvec
== info
->hash
->creator
957 && check_relocs
!= NULL
)
961 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
963 Elf_Internal_Rela
*internal_relocs
;
966 if ((o
->flags
& SEC_RELOC
) == 0
967 || o
->reloc_count
== 0)
970 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
971 (abfd
, o
, (PTR
) NULL
,
972 (Elf_Internal_Rela
*) NULL
,
974 if (internal_relocs
== NULL
)
977 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
979 if (! info
->keep_memory
)
980 free (internal_relocs
);
987 /* If this is a non-traditional, non-relocateable link, try to
988 optimize the handling of the .stab/.stabstr sections. */
990 && ! info
->relocateable
991 && ! info
->traditional_format
992 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
993 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
995 asection
*stab
, *stabstr
;
997 stab
= bfd_get_section_by_name (abfd
, ".stab");
1000 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1002 if (stabstr
!= NULL
)
1004 struct bfd_elf_section_data
*secdata
;
1006 secdata
= elf_section_data (stab
);
1007 if (! _bfd_link_section_stabs (abfd
,
1008 &elf_hash_table (info
)->stab_info
,
1010 &secdata
->stab_info
))
1026 /* Create some sections which will be filled in with dynamic linking
1027 information. ABFD is an input file which requires dynamic sections
1028 to be created. The dynamic sections take up virtual memory space
1029 when the final executable is run, so we need to create them before
1030 addresses are assigned to the output sections. We work out the
1031 actual contents and size of these sections later. */
1034 elf_link_create_dynamic_sections (abfd
, info
)
1036 struct bfd_link_info
*info
;
1039 register asection
*s
;
1040 struct elf_link_hash_entry
*h
;
1041 struct elf_backend_data
*bed
;
1043 if (elf_hash_table (info
)->dynamic_sections_created
)
1046 /* Make sure that all dynamic sections use the same input BFD. */
1047 if (elf_hash_table (info
)->dynobj
== NULL
)
1048 elf_hash_table (info
)->dynobj
= abfd
;
1050 abfd
= elf_hash_table (info
)->dynobj
;
1052 /* Note that we set the SEC_IN_MEMORY flag for all of these
1054 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
;
1056 /* A dynamically linked executable has a .interp section, but a
1057 shared library does not. */
1060 s
= bfd_make_section (abfd
, ".interp");
1062 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1066 s
= bfd_make_section (abfd
, ".dynsym");
1068 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1069 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1072 s
= bfd_make_section (abfd
, ".dynstr");
1074 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1077 /* Create a strtab to hold the dynamic symbol names. */
1078 if (elf_hash_table (info
)->dynstr
== NULL
)
1080 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1081 if (elf_hash_table (info
)->dynstr
== NULL
)
1085 s
= bfd_make_section (abfd
, ".dynamic");
1087 || ! bfd_set_section_flags (abfd
, s
, flags
)
1088 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1091 /* The special symbol _DYNAMIC is always set to the start of the
1092 .dynamic section. This call occurs before we have processed the
1093 symbols for any dynamic object, so we don't have to worry about
1094 overriding a dynamic definition. We could set _DYNAMIC in a
1095 linker script, but we only want to define it if we are, in fact,
1096 creating a .dynamic section. We don't want to define it if there
1097 is no .dynamic section, since on some ELF platforms the start up
1098 code examines it to decide how to initialize the process. */
1100 if (! (_bfd_generic_link_add_one_symbol
1101 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1102 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1103 (struct bfd_link_hash_entry
**) &h
)))
1105 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1106 h
->type
= STT_OBJECT
;
1109 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1112 s
= bfd_make_section (abfd
, ".hash");
1114 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1115 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1118 /* Let the backend create the rest of the sections. This lets the
1119 backend set the right flags. The backend will normally create
1120 the .got and .plt sections. */
1121 bed
= get_elf_backend_data (abfd
);
1122 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1125 elf_hash_table (info
)->dynamic_sections_created
= true;
1130 /* Add an entry to the .dynamic table. */
1133 elf_add_dynamic_entry (info
, tag
, val
)
1134 struct bfd_link_info
*info
;
1138 Elf_Internal_Dyn dyn
;
1142 bfd_byte
*newcontents
;
1144 dynobj
= elf_hash_table (info
)->dynobj
;
1146 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1147 BFD_ASSERT (s
!= NULL
);
1149 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1150 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1151 if (newcontents
== NULL
)
1155 dyn
.d_un
.d_val
= val
;
1156 elf_swap_dyn_out (dynobj
, &dyn
,
1157 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1159 s
->_raw_size
= newsize
;
1160 s
->contents
= newcontents
;
1166 /* Read and swap the relocs for a section. They may have been cached.
1167 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1168 they are used as buffers to read into. They are known to be large
1169 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1170 value is allocated using either malloc or bfd_alloc, according to
1171 the KEEP_MEMORY argument. */
1174 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1178 PTR external_relocs
;
1179 Elf_Internal_Rela
*internal_relocs
;
1180 boolean keep_memory
;
1182 Elf_Internal_Shdr
*rel_hdr
;
1184 Elf_Internal_Rela
*alloc2
= NULL
;
1186 if (elf_section_data (o
)->relocs
!= NULL
)
1187 return elf_section_data (o
)->relocs
;
1189 if (o
->reloc_count
== 0)
1192 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1194 if (internal_relocs
== NULL
)
1198 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1200 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1202 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1203 if (internal_relocs
== NULL
)
1207 if (external_relocs
== NULL
)
1209 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1212 external_relocs
= alloc1
;
1215 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1216 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1217 != rel_hdr
->sh_size
))
1220 /* Swap in the relocs. For convenience, we always produce an
1221 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1223 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1225 Elf_External_Rel
*erel
;
1226 Elf_External_Rel
*erelend
;
1227 Elf_Internal_Rela
*irela
;
1229 erel
= (Elf_External_Rel
*) external_relocs
;
1230 erelend
= erel
+ o
->reloc_count
;
1231 irela
= internal_relocs
;
1232 for (; erel
< erelend
; erel
++, irela
++)
1234 Elf_Internal_Rel irel
;
1236 elf_swap_reloc_in (abfd
, erel
, &irel
);
1237 irela
->r_offset
= irel
.r_offset
;
1238 irela
->r_info
= irel
.r_info
;
1239 irela
->r_addend
= 0;
1244 Elf_External_Rela
*erela
;
1245 Elf_External_Rela
*erelaend
;
1246 Elf_Internal_Rela
*irela
;
1248 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1250 erela
= (Elf_External_Rela
*) external_relocs
;
1251 erelaend
= erela
+ o
->reloc_count
;
1252 irela
= internal_relocs
;
1253 for (; erela
< erelaend
; erela
++, irela
++)
1254 elf_swap_reloca_in (abfd
, erela
, irela
);
1257 /* Cache the results for next time, if we can. */
1259 elf_section_data (o
)->relocs
= internal_relocs
;
1264 /* Don't free alloc2, since if it was allocated we are passing it
1265 back (under the name of internal_relocs). */
1267 return internal_relocs
;
1278 /* Record an assignment to a symbol made by a linker script. We need
1279 this in case some dynamic object refers to this symbol. */
1283 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1285 struct bfd_link_info
*info
;
1289 struct elf_link_hash_entry
*h
;
1291 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1294 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1298 if (h
->root
.type
== bfd_link_hash_new
)
1299 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
1301 /* If this symbol is being provided by the linker script, and it is
1302 currently defined by a dynamic object, but not by a regular
1303 object, then mark it as undefined so that the generic linker will
1304 force the correct value. */
1306 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1307 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1308 h
->root
.type
= bfd_link_hash_undefined
;
1310 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1311 h
->type
= STT_OBJECT
;
1313 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1314 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1316 && h
->dynindx
== -1)
1318 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1321 /* If this is a weak defined symbol, and we know a corresponding
1322 real symbol from the same dynamic object, make sure the real
1323 symbol is also made into a dynamic symbol. */
1324 if (h
->weakdef
!= NULL
1325 && h
->weakdef
->dynindx
== -1)
1327 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1336 /* Array used to determine the number of hash table buckets to use
1337 based on the number of symbols there are. If there are fewer than
1338 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1339 fewer than 37 we use 17 buckets, and so forth. We never use more
1340 than 32771 buckets. */
1342 static const size_t elf_buckets
[] =
1344 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
1348 /* Set up the sizes and contents of the ELF dynamic sections. This is
1349 called by the ELF linker emulation before_allocation routine. We
1350 must set the sizes of the sections before the linker sets the
1351 addresses of the various sections. */
1354 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
1355 export_dynamic
, filter_shlib
,
1356 auxiliary_filter_shlib
, info
, sinterpptr
)
1360 boolean export_dynamic
;
1361 const char *filter_shlib
;
1362 const char *auxiliary_filter_shlib
;
1363 struct bfd_link_info
*info
;
1364 asection
**sinterpptr
;
1367 struct elf_backend_data
*bed
;
1371 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1374 dynobj
= elf_hash_table (info
)->dynobj
;
1376 /* If there were no dynamic objects in the link, there is nothing to
1381 /* If we are supposed to export all symbols into the dynamic symbol
1382 table (this is not the normal case), then do so. */
1385 struct elf_info_failed eif
;
1389 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
1395 if (elf_hash_table (info
)->dynamic_sections_created
)
1397 struct elf_info_failed eif
;
1398 struct elf_link_hash_entry
*h
;
1399 bfd_size_type strsize
;
1401 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
1402 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
1408 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, soname
,
1410 if (indx
== (bfd_size_type
) -1
1411 || ! elf_add_dynamic_entry (info
, DT_SONAME
, indx
))
1417 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
1425 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
1427 if (indx
== (bfd_size_type
) -1
1428 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
1432 if (filter_shlib
!= NULL
)
1436 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
1437 filter_shlib
, true, true);
1438 if (indx
== (bfd_size_type
) -1
1439 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
1443 if (auxiliary_filter_shlib
!= NULL
)
1447 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
1448 auxiliary_filter_shlib
, true, true);
1449 if (indx
== (bfd_size_type
) -1
1450 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
1454 /* Find all symbols which were defined in a dynamic object and make
1455 the backend pick a reasonable value for them. */
1458 elf_link_hash_traverse (elf_hash_table (info
),
1459 elf_adjust_dynamic_symbol
,
1464 /* Add some entries to the .dynamic section. We fill in some of the
1465 values later, in elf_bfd_final_link, but we must add the entries
1466 now so that we know the final size of the .dynamic section. */
1467 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
1470 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1471 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1473 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
1476 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
1479 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1480 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1482 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
1485 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1486 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
1487 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
1488 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
1489 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
1490 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
1491 sizeof (Elf_External_Sym
)))
1495 /* The backend must work out the sizes of all the other dynamic
1497 bed
= get_elf_backend_data (output_bfd
);
1498 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
1501 if (elf_hash_table (info
)->dynamic_sections_created
)
1506 size_t bucketcount
= 0;
1507 Elf_Internal_Sym isym
;
1509 /* Set the size of the .dynsym and .hash sections. We counted
1510 the number of dynamic symbols in elf_link_add_object_symbols.
1511 We will build the contents of .dynsym and .hash when we build
1512 the final symbol table, because until then we do not know the
1513 correct value to give the symbols. We built the .dynstr
1514 section as we went along in elf_link_add_object_symbols. */
1515 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
1516 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
1517 BFD_ASSERT (s
!= NULL
);
1518 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
1519 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1520 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
1523 /* The first entry in .dynsym is a dummy symbol. */
1530 elf_swap_symbol_out (output_bfd
, &isym
,
1531 (PTR
) (Elf_External_Sym
*) s
->contents
);
1533 for (i
= 0; elf_buckets
[i
] != 0; i
++)
1535 bucketcount
= elf_buckets
[i
];
1536 if (dynsymcount
< elf_buckets
[i
+ 1])
1540 s
= bfd_get_section_by_name (dynobj
, ".hash");
1541 BFD_ASSERT (s
!= NULL
);
1542 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
1543 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1544 if (s
->contents
== NULL
)
1546 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
1548 put_word (output_bfd
, bucketcount
, s
->contents
);
1549 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
1551 elf_hash_table (info
)->bucketcount
= bucketcount
;
1553 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
1554 BFD_ASSERT (s
!= NULL
);
1555 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1557 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
1565 /* This routine is used to export all defined symbols into the dynamic
1566 symbol table. It is called via elf_link_hash_traverse. */
1569 elf_export_symbol (h
, data
)
1570 struct elf_link_hash_entry
*h
;
1573 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1575 if (h
->dynindx
== -1
1576 && (h
->elf_link_hash_flags
1577 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
1579 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1590 /* Make the backend pick a good value for a dynamic symbol. This is
1591 called via elf_link_hash_traverse, and also calls itself
1595 elf_adjust_dynamic_symbol (h
, data
)
1596 struct elf_link_hash_entry
*h
;
1599 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1601 struct elf_backend_data
*bed
;
1603 /* If this symbol was mentioned in a non-ELF file, try to set
1604 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
1605 permit a non-ELF file to correctly refer to a symbol defined in
1606 an ELF dynamic object. */
1607 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
1609 if (h
->root
.type
!= bfd_link_hash_defined
1610 && h
->root
.type
!= bfd_link_hash_defweak
)
1611 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1614 if (h
->root
.u
.def
.section
->owner
!= NULL
1615 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
1616 == bfd_target_elf_flavour
))
1617 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1619 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1622 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1623 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
1625 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1633 /* If this is a final link, and the symbol was defined as a common
1634 symbol in a regular object file, and there was no definition in
1635 any dynamic object, then the linker will have allocated space for
1636 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
1637 flag will not have been set. */
1638 if (h
->root
.type
== bfd_link_hash_defined
1639 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
1640 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
1641 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1642 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
1643 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1645 /* If -Bsymbolic was used (which means to bind references to global
1646 symbols to the definition within the shared object), and this
1647 symbol was defined in a regular object, then it actually doesn't
1648 need a PLT entry. */
1649 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
1650 && eif
->info
->shared
1651 && eif
->info
->symbolic
1652 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1653 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
1655 /* If this symbol does not require a PLT entry, and it is not
1656 defined by a dynamic object, or is not referenced by a regular
1657 object, ignore it. We do have to handle a weak defined symbol,
1658 even if no regular object refers to it, if we decided to add it
1659 to the dynamic symbol table. FIXME: Do we normally need to worry
1660 about symbols which are defined by one dynamic object and
1661 referenced by another one? */
1662 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
1663 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
1664 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1665 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
1666 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
1669 /* If we've already adjusted this symbol, don't do it again. This
1670 can happen via a recursive call. */
1671 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
1674 /* Don't look at this symbol again. Note that we must set this
1675 after checking the above conditions, because we may look at a
1676 symbol once, decide not to do anything, and then get called
1677 recursively later after REF_REGULAR is set below. */
1678 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
1680 /* If this is a weak definition, and we know a real definition, and
1681 the real symbol is not itself defined by a regular object file,
1682 then get a good value for the real definition. We handle the
1683 real symbol first, for the convenience of the backend routine.
1685 Note that there is a confusing case here. If the real definition
1686 is defined by a regular object file, we don't get the real symbol
1687 from the dynamic object, but we do get the weak symbol. If the
1688 processor backend uses a COPY reloc, then if some routine in the
1689 dynamic object changes the real symbol, we will not see that
1690 change in the corresponding weak symbol. This is the way other
1691 ELF linkers work as well, and seems to be a result of the shared
1694 I will clarify this issue. Most SVR4 shared libraries define the
1695 variable _timezone and define timezone as a weak synonym. The
1696 tzset call changes _timezone. If you write
1697 extern int timezone;
1699 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
1700 you might expect that, since timezone is a synonym for _timezone,
1701 the same number will print both times. However, if the processor
1702 backend uses a COPY reloc, then actually timezone will be copied
1703 into your process image, and, since you define _timezone
1704 yourself, _timezone will not. Thus timezone and _timezone will
1705 wind up at different memory locations. The tzset call will set
1706 _timezone, leaving timezone unchanged. */
1708 if (h
->weakdef
!= NULL
)
1710 struct elf_link_hash_entry
*weakdef
;
1712 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
1713 || h
->root
.type
== bfd_link_hash_defweak
);
1714 weakdef
= h
->weakdef
;
1715 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
1716 || weakdef
->root
.type
== bfd_link_hash_defweak
);
1717 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
1718 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1720 /* This symbol is defined by a regular object file, so we
1721 will not do anything special. Clear weakdef for the
1722 convenience of the processor backend. */
1727 /* There is an implicit reference by a regular object file
1728 via the weak symbol. */
1729 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1730 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
1735 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
1736 bed
= get_elf_backend_data (dynobj
);
1737 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
1746 /* Final phase of ELF linker. */
1748 /* A structure we use to avoid passing large numbers of arguments. */
1750 struct elf_final_link_info
1752 /* General link information. */
1753 struct bfd_link_info
*info
;
1756 /* Symbol string table. */
1757 struct bfd_strtab_hash
*symstrtab
;
1758 /* .dynsym section. */
1759 asection
*dynsym_sec
;
1760 /* .hash section. */
1762 /* Buffer large enough to hold contents of any section. */
1764 /* Buffer large enough to hold external relocs of any section. */
1765 PTR external_relocs
;
1766 /* Buffer large enough to hold internal relocs of any section. */
1767 Elf_Internal_Rela
*internal_relocs
;
1768 /* Buffer large enough to hold external local symbols of any input
1770 Elf_External_Sym
*external_syms
;
1771 /* Buffer large enough to hold internal local symbols of any input
1773 Elf_Internal_Sym
*internal_syms
;
1774 /* Array large enough to hold a symbol index for each local symbol
1775 of any input BFD. */
1777 /* Array large enough to hold a section pointer for each local
1778 symbol of any input BFD. */
1779 asection
**sections
;
1780 /* Buffer to hold swapped out symbols. */
1781 Elf_External_Sym
*symbuf
;
1782 /* Number of swapped out symbols in buffer. */
1783 size_t symbuf_count
;
1784 /* Number of symbols which fit in symbuf. */
1788 static boolean elf_link_output_sym
1789 PARAMS ((struct elf_final_link_info
*, const char *,
1790 Elf_Internal_Sym
*, asection
*));
1791 static boolean elf_link_flush_output_syms
1792 PARAMS ((struct elf_final_link_info
*));
1793 static boolean elf_link_output_extsym
1794 PARAMS ((struct elf_link_hash_entry
*, PTR
));
1795 static boolean elf_link_input_bfd
1796 PARAMS ((struct elf_final_link_info
*, bfd
*));
1797 static boolean elf_reloc_link_order
1798 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
1799 struct bfd_link_order
*));
1801 /* This struct is used to pass information to routines called via
1802 elf_link_hash_traverse which must return failure. */
1804 struct elf_finfo_failed
1807 struct elf_final_link_info
*finfo
;
1810 /* Do the final step of an ELF link. */
1813 elf_bfd_final_link (abfd
, info
)
1815 struct bfd_link_info
*info
;
1819 struct elf_final_link_info finfo
;
1820 register asection
*o
;
1821 register struct bfd_link_order
*p
;
1823 size_t max_contents_size
;
1824 size_t max_external_reloc_size
;
1825 size_t max_internal_reloc_count
;
1826 size_t max_sym_count
;
1828 Elf_Internal_Sym elfsym
;
1830 Elf_Internal_Shdr
*symtab_hdr
;
1831 Elf_Internal_Shdr
*symstrtab_hdr
;
1832 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1833 struct elf_finfo_failed eif
;
1836 abfd
->flags
|= DYNAMIC
;
1838 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
1839 dynobj
= elf_hash_table (info
)->dynobj
;
1842 finfo
.output_bfd
= abfd
;
1843 finfo
.symstrtab
= elf_stringtab_init ();
1844 if (finfo
.symstrtab
== NULL
)
1848 finfo
.dynsym_sec
= NULL
;
1849 finfo
.hash_sec
= NULL
;
1853 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
1854 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
1855 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
1857 finfo
.contents
= NULL
;
1858 finfo
.external_relocs
= NULL
;
1859 finfo
.internal_relocs
= NULL
;
1860 finfo
.external_syms
= NULL
;
1861 finfo
.internal_syms
= NULL
;
1862 finfo
.indices
= NULL
;
1863 finfo
.sections
= NULL
;
1864 finfo
.symbuf
= NULL
;
1865 finfo
.symbuf_count
= 0;
1867 /* Count up the number of relocations we will output for each output
1868 section, so that we know the sizes of the reloc sections. We
1869 also figure out some maximum sizes. */
1870 max_contents_size
= 0;
1871 max_external_reloc_size
= 0;
1872 max_internal_reloc_count
= 0;
1874 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
1878 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
1880 if (p
->type
== bfd_section_reloc_link_order
1881 || p
->type
== bfd_symbol_reloc_link_order
)
1883 else if (p
->type
== bfd_indirect_link_order
)
1887 sec
= p
->u
.indirect
.section
;
1889 /* Mark all sections which are to be included in the
1890 link. This will normally be every section. We need
1891 to do this so that we can identify any sections which
1892 the linker has decided to not include. */
1893 sec
->linker_mark
= true;
1895 if (info
->relocateable
)
1896 o
->reloc_count
+= sec
->reloc_count
;
1898 if (sec
->_raw_size
> max_contents_size
)
1899 max_contents_size
= sec
->_raw_size
;
1900 if (sec
->_cooked_size
> max_contents_size
)
1901 max_contents_size
= sec
->_cooked_size
;
1903 /* We are interested in just local symbols, not all
1905 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
)
1909 if (elf_bad_symtab (sec
->owner
))
1910 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
1911 / sizeof (Elf_External_Sym
));
1913 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
1915 if (sym_count
> max_sym_count
)
1916 max_sym_count
= sym_count
;
1918 if ((sec
->flags
& SEC_RELOC
) != 0)
1922 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
1923 if (ext_size
> max_external_reloc_size
)
1924 max_external_reloc_size
= ext_size
;
1925 if (sec
->reloc_count
> max_internal_reloc_count
)
1926 max_internal_reloc_count
= sec
->reloc_count
;
1932 if (o
->reloc_count
> 0)
1933 o
->flags
|= SEC_RELOC
;
1936 /* Explicitly clear the SEC_RELOC flag. The linker tends to
1937 set it (this is probably a bug) and if it is set
1938 assign_section_numbers will create a reloc section. */
1939 o
->flags
&=~ SEC_RELOC
;
1942 /* If the SEC_ALLOC flag is not set, force the section VMA to
1943 zero. This is done in elf_fake_sections as well, but forcing
1944 the VMA to 0 here will ensure that relocs against these
1945 sections are handled correctly. */
1946 if ((o
->flags
& SEC_ALLOC
) == 0
1947 && ! o
->user_set_vma
)
1951 /* Figure out the file positions for everything but the symbol table
1952 and the relocs. We set symcount to force assign_section_numbers
1953 to create a symbol table. */
1954 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
1955 BFD_ASSERT (! abfd
->output_has_begun
);
1956 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
1959 /* That created the reloc sections. Set their sizes, and assign
1960 them file positions, and allocate some buffers. */
1961 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1963 if ((o
->flags
& SEC_RELOC
) != 0)
1965 Elf_Internal_Shdr
*rel_hdr
;
1966 register struct elf_link_hash_entry
**p
, **pend
;
1968 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1970 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
1972 /* The contents field must last into write_object_contents,
1973 so we allocate it with bfd_alloc rather than malloc. */
1974 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
1975 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
1978 p
= ((struct elf_link_hash_entry
**)
1979 bfd_malloc (o
->reloc_count
1980 * sizeof (struct elf_link_hash_entry
*)));
1981 if (p
== NULL
&& o
->reloc_count
!= 0)
1983 elf_section_data (o
)->rel_hashes
= p
;
1984 pend
= p
+ o
->reloc_count
;
1985 for (; p
< pend
; p
++)
1988 /* Use the reloc_count field as an index when outputting the
1994 _bfd_elf_assign_file_positions_for_relocs (abfd
);
1996 /* We have now assigned file positions for all the sections except
1997 .symtab and .strtab. We start the .symtab section at the current
1998 file position, and write directly to it. We build the .strtab
1999 section in memory. */
2001 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2002 /* sh_name is set in prep_headers. */
2003 symtab_hdr
->sh_type
= SHT_SYMTAB
;
2004 symtab_hdr
->sh_flags
= 0;
2005 symtab_hdr
->sh_addr
= 0;
2006 symtab_hdr
->sh_size
= 0;
2007 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
2008 /* sh_link is set in assign_section_numbers. */
2009 /* sh_info is set below. */
2010 /* sh_offset is set just below. */
2011 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
2013 off
= elf_tdata (abfd
)->next_file_pos
;
2014 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
2016 /* Note that at this point elf_tdata (abfd)->next_file_pos is
2017 incorrect. We do not yet know the size of the .symtab section.
2018 We correct next_file_pos below, after we do know the size. */
2020 /* Allocate a buffer to hold swapped out symbols. This is to avoid
2021 continuously seeking to the right position in the file. */
2022 if (! info
->keep_memory
|| max_sym_count
< 20)
2023 finfo
.symbuf_size
= 20;
2025 finfo
.symbuf_size
= max_sym_count
;
2026 finfo
.symbuf
= ((Elf_External_Sym
*)
2027 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
2028 if (finfo
.symbuf
== NULL
)
2031 /* Start writing out the symbol table. The first symbol is always a
2033 if (info
->strip
!= strip_all
|| info
->relocateable
)
2035 elfsym
.st_value
= 0;
2038 elfsym
.st_other
= 0;
2039 elfsym
.st_shndx
= SHN_UNDEF
;
2040 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
2041 &elfsym
, bfd_und_section_ptr
))
2046 /* Some standard ELF linkers do this, but we don't because it causes
2047 bootstrap comparison failures. */
2048 /* Output a file symbol for the output file as the second symbol.
2049 We output this even if we are discarding local symbols, although
2050 I'm not sure if this is correct. */
2051 elfsym
.st_value
= 0;
2053 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
2054 elfsym
.st_other
= 0;
2055 elfsym
.st_shndx
= SHN_ABS
;
2056 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
2057 &elfsym
, bfd_abs_section_ptr
))
2061 /* Output a symbol for each section. We output these even if we are
2062 discarding local symbols, since they are used for relocs. These
2063 symbols have no names. We store the index of each one in the
2064 index field of the section, so that we can find it again when
2065 outputting relocs. */
2066 if (info
->strip
!= strip_all
|| info
->relocateable
)
2068 elfsym
.st_value
= 0;
2070 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
2071 elfsym
.st_other
= 0;
2072 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
2074 o
= section_from_elf_index (abfd
, i
);
2076 o
->target_index
= abfd
->symcount
;
2077 elfsym
.st_shndx
= i
;
2078 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
2084 /* Allocate some memory to hold information read in from the input
2086 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
2087 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
2088 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
2089 bfd_malloc (max_internal_reloc_count
2090 * sizeof (Elf_Internal_Rela
)));
2091 finfo
.external_syms
= ((Elf_External_Sym
*)
2092 bfd_malloc (max_sym_count
2093 * sizeof (Elf_External_Sym
)));
2094 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
2095 bfd_malloc (max_sym_count
2096 * sizeof (Elf_Internal_Sym
)));
2097 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
2098 finfo
.sections
= ((asection
**)
2099 bfd_malloc (max_sym_count
* sizeof (asection
*)));
2100 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
2101 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
2102 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
2103 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
2104 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
2105 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
2106 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
2109 /* Since ELF permits relocations to be against local symbols, we
2110 must have the local symbols available when we do the relocations.
2111 Since we would rather only read the local symbols once, and we
2112 would rather not keep them in memory, we handle all the
2113 relocations for a single input file at the same time.
2115 Unfortunately, there is no way to know the total number of local
2116 symbols until we have seen all of them, and the local symbol
2117 indices precede the global symbol indices. This means that when
2118 we are generating relocateable output, and we see a reloc against
2119 a global symbol, we can not know the symbol index until we have
2120 finished examining all the local symbols to see which ones we are
2121 going to output. To deal with this, we keep the relocations in
2122 memory, and don't output them until the end of the link. This is
2123 an unfortunate waste of memory, but I don't see a good way around
2124 it. Fortunately, it only happens when performing a relocateable
2125 link, which is not the common case. FIXME: If keep_memory is set
2126 we could write the relocs out and then read them again; I don't
2127 know how bad the memory loss will be. */
2129 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
2130 sub
->output_has_begun
= false;
2131 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2133 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
2135 if (p
->type
== bfd_indirect_link_order
2136 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
2137 == bfd_target_elf_flavour
))
2139 sub
= p
->u
.indirect
.section
->owner
;
2140 if (! sub
->output_has_begun
)
2142 if (! elf_link_input_bfd (&finfo
, sub
))
2144 sub
->output_has_begun
= true;
2147 else if (p
->type
== bfd_section_reloc_link_order
2148 || p
->type
== bfd_symbol_reloc_link_order
)
2150 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
2155 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
2161 /* That wrote out all the local symbols. Finish up the symbol table
2162 with the global symbols. */
2164 /* The sh_info field records the index of the first non local
2166 symtab_hdr
->sh_info
= abfd
->symcount
;
2168 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
2170 /* We get the global symbols from the hash table. */
2173 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
2178 /* Flush all symbols to the file. */
2179 if (! elf_link_flush_output_syms (&finfo
))
2182 /* Now we know the size of the symtab section. */
2183 off
+= symtab_hdr
->sh_size
;
2185 /* Finish up and write out the symbol string table (.strtab)
2187 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
2188 /* sh_name was set in prep_headers. */
2189 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
2190 symstrtab_hdr
->sh_flags
= 0;
2191 symstrtab_hdr
->sh_addr
= 0;
2192 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
2193 symstrtab_hdr
->sh_entsize
= 0;
2194 symstrtab_hdr
->sh_link
= 0;
2195 symstrtab_hdr
->sh_info
= 0;
2196 /* sh_offset is set just below. */
2197 symstrtab_hdr
->sh_addralign
= 1;
2199 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
2200 elf_tdata (abfd
)->next_file_pos
= off
;
2202 if (abfd
->symcount
> 0)
2204 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
2205 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
2209 /* Adjust the relocs to have the correct symbol indices. */
2210 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2212 struct elf_link_hash_entry
**rel_hash
;
2213 Elf_Internal_Shdr
*rel_hdr
;
2215 if ((o
->flags
& SEC_RELOC
) == 0)
2218 rel_hash
= elf_section_data (o
)->rel_hashes
;
2219 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2220 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
2222 if (*rel_hash
== NULL
)
2225 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
2227 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2229 Elf_External_Rel
*erel
;
2230 Elf_Internal_Rel irel
;
2232 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
2233 elf_swap_reloc_in (abfd
, erel
, &irel
);
2234 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2235 ELF_R_TYPE (irel
.r_info
));
2236 elf_swap_reloc_out (abfd
, &irel
, erel
);
2240 Elf_External_Rela
*erela
;
2241 Elf_Internal_Rela irela
;
2243 BFD_ASSERT (rel_hdr
->sh_entsize
2244 == sizeof (Elf_External_Rela
));
2246 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
2247 elf_swap_reloca_in (abfd
, erela
, &irela
);
2248 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2249 ELF_R_TYPE (irela
.r_info
));
2250 elf_swap_reloca_out (abfd
, &irela
, erela
);
2254 /* Set the reloc_count field to 0 to prevent write_relocs from
2255 trying to swap the relocs out itself. */
2259 /* If we are linking against a dynamic object, or generating a
2260 shared library, finish up the dynamic linking information. */
2263 Elf_External_Dyn
*dyncon
, *dynconend
;
2265 /* Fix up .dynamic entries. */
2266 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
2267 BFD_ASSERT (o
!= NULL
);
2269 dyncon
= (Elf_External_Dyn
*) o
->contents
;
2270 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
2271 for (; dyncon
< dynconend
; dyncon
++)
2273 Elf_Internal_Dyn dyn
;
2277 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2284 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
2285 magic _init and _fini symbols. This is pretty ugly,
2286 but we are compatible. */
2294 struct elf_link_hash_entry
*h
;
2296 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
2297 false, false, true);
2299 && (h
->root
.type
== bfd_link_hash_defined
2300 || h
->root
.type
== bfd_link_hash_defweak
))
2302 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
2303 o
= h
->root
.u
.def
.section
;
2304 if (o
->output_section
!= NULL
)
2305 dyn
.d_un
.d_val
+= (o
->output_section
->vma
2306 + o
->output_offset
);
2309 /* The symbol is imported from another shared
2310 library and does not apply to this one. */
2314 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2328 o
= bfd_get_section_by_name (abfd
, name
);
2329 BFD_ASSERT (o
!= NULL
);
2330 dyn
.d_un
.d_ptr
= o
->vma
;
2331 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2338 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
2343 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
2345 Elf_Internal_Shdr
*hdr
;
2347 hdr
= elf_elfsections (abfd
)[i
];
2348 if (hdr
->sh_type
== type
2349 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
2351 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
2352 dyn
.d_un
.d_val
+= hdr
->sh_size
;
2355 if (dyn
.d_un
.d_val
== 0
2356 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
2357 dyn
.d_un
.d_val
= hdr
->sh_addr
;
2361 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2367 /* If we have created any dynamic sections, then output them. */
2370 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
2373 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
2375 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
2376 || o
->_raw_size
== 0)
2378 if ((o
->flags
& SEC_IN_MEMORY
) == 0)
2380 /* At this point, we are only interested in sections
2381 created by elf_link_create_dynamic_sections. FIXME:
2382 This test is fragile. */
2385 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
2387 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
2389 if (! bfd_set_section_contents (abfd
, o
->output_section
,
2390 o
->contents
, o
->output_offset
,
2398 /* The contents of the .dynstr section are actually in a
2400 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
2401 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
2402 || ! _bfd_stringtab_emit (abfd
,
2403 elf_hash_table (info
)->dynstr
))
2409 /* If we have optimized stabs strings, output them. */
2410 if (elf_hash_table (info
)->stab_info
!= NULL
)
2412 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
2416 if (finfo
.symstrtab
!= NULL
)
2417 _bfd_stringtab_free (finfo
.symstrtab
);
2418 if (finfo
.contents
!= NULL
)
2419 free (finfo
.contents
);
2420 if (finfo
.external_relocs
!= NULL
)
2421 free (finfo
.external_relocs
);
2422 if (finfo
.internal_relocs
!= NULL
)
2423 free (finfo
.internal_relocs
);
2424 if (finfo
.external_syms
!= NULL
)
2425 free (finfo
.external_syms
);
2426 if (finfo
.internal_syms
!= NULL
)
2427 free (finfo
.internal_syms
);
2428 if (finfo
.indices
!= NULL
)
2429 free (finfo
.indices
);
2430 if (finfo
.sections
!= NULL
)
2431 free (finfo
.sections
);
2432 if (finfo
.symbuf
!= NULL
)
2433 free (finfo
.symbuf
);
2434 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2436 if ((o
->flags
& SEC_RELOC
) != 0
2437 && elf_section_data (o
)->rel_hashes
!= NULL
)
2438 free (elf_section_data (o
)->rel_hashes
);
2441 elf_tdata (abfd
)->linker
= true;
2446 if (finfo
.symstrtab
!= NULL
)
2447 _bfd_stringtab_free (finfo
.symstrtab
);
2448 if (finfo
.contents
!= NULL
)
2449 free (finfo
.contents
);
2450 if (finfo
.external_relocs
!= NULL
)
2451 free (finfo
.external_relocs
);
2452 if (finfo
.internal_relocs
!= NULL
)
2453 free (finfo
.internal_relocs
);
2454 if (finfo
.external_syms
!= NULL
)
2455 free (finfo
.external_syms
);
2456 if (finfo
.internal_syms
!= NULL
)
2457 free (finfo
.internal_syms
);
2458 if (finfo
.indices
!= NULL
)
2459 free (finfo
.indices
);
2460 if (finfo
.sections
!= NULL
)
2461 free (finfo
.sections
);
2462 if (finfo
.symbuf
!= NULL
)
2463 free (finfo
.symbuf
);
2464 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2466 if ((o
->flags
& SEC_RELOC
) != 0
2467 && elf_section_data (o
)->rel_hashes
!= NULL
)
2468 free (elf_section_data (o
)->rel_hashes
);
2474 /* Add a symbol to the output symbol table. */
2477 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
2478 struct elf_final_link_info
*finfo
;
2480 Elf_Internal_Sym
*elfsym
;
2481 asection
*input_sec
;
2483 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
2484 struct bfd_link_info
*info
,
2489 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
2490 elf_backend_link_output_symbol_hook
;
2491 if (output_symbol_hook
!= NULL
)
2493 if (! ((*output_symbol_hook
)
2494 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
2498 if (name
== (const char *) NULL
|| *name
== '\0')
2499 elfsym
->st_name
= 0;
2502 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
2505 if (elfsym
->st_name
== (unsigned long) -1)
2509 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
2511 if (! elf_link_flush_output_syms (finfo
))
2515 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
2516 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
2517 ++finfo
->symbuf_count
;
2519 ++finfo
->output_bfd
->symcount
;
2524 /* Flush the output symbols to the file. */
2527 elf_link_flush_output_syms (finfo
)
2528 struct elf_final_link_info
*finfo
;
2530 if (finfo
->symbuf_count
> 0)
2532 Elf_Internal_Shdr
*symtab
;
2534 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
2536 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
2538 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
2539 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
2540 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
2543 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
2545 finfo
->symbuf_count
= 0;
2551 /* Add an external symbol to the symbol table. This is called from
2552 the hash table traversal routine. */
2555 elf_link_output_extsym (h
, data
)
2556 struct elf_link_hash_entry
*h
;
2559 struct elf_finfo_failed
*eif
= (struct elf_finfo_failed
*) data
;
2560 struct elf_final_link_info
*finfo
= eif
->finfo
;
2562 Elf_Internal_Sym sym
;
2563 asection
*input_sec
;
2565 /* If we are not creating a shared library, and this symbol is
2566 referenced by a shared library but is not defined anywhere, then
2567 warn that it is undefined. If we do not do this, the runtime
2568 linker will complain that the symbol is undefined when the
2569 program is run. We don't have to worry about symbols that are
2570 referenced by regular files, because we will already have issued
2571 warnings for them. */
2572 if (! finfo
->info
->relocateable
2573 && ! finfo
->info
->shared
2574 && h
->root
.type
== bfd_link_hash_undefined
2575 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
2576 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2578 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
2579 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
2580 (asection
*) NULL
, 0)))
2587 /* We don't want to output symbols that have never been mentioned by
2588 a regular file, or that we have been told to strip. However, if
2589 h->indx is set to -2, the symbol is used by a reloc and we must
2593 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2594 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2595 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2596 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2598 else if (finfo
->info
->strip
== strip_all
2599 || (finfo
->info
->strip
== strip_some
2600 && bfd_hash_lookup (finfo
->info
->keep_hash
,
2601 h
->root
.root
.string
,
2602 false, false) == NULL
))
2607 /* If we're stripping it, and it's not a dynamic symbol, there's
2608 nothing else to do. */
2609 if (strip
&& h
->dynindx
== -1)
2613 sym
.st_size
= h
->size
;
2614 sym
.st_other
= h
->other
;
2615 if (h
->root
.type
== bfd_link_hash_undefweak
2616 || h
->root
.type
== bfd_link_hash_defweak
)
2617 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
2619 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
2621 switch (h
->root
.type
)
2624 case bfd_link_hash_new
:
2628 case bfd_link_hash_undefined
:
2629 input_sec
= bfd_und_section_ptr
;
2630 sym
.st_shndx
= SHN_UNDEF
;
2633 case bfd_link_hash_undefweak
:
2634 input_sec
= bfd_und_section_ptr
;
2635 sym
.st_shndx
= SHN_UNDEF
;
2638 case bfd_link_hash_defined
:
2639 case bfd_link_hash_defweak
:
2641 input_sec
= h
->root
.u
.def
.section
;
2642 if (input_sec
->output_section
!= NULL
)
2645 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
2646 input_sec
->output_section
);
2647 if (sym
.st_shndx
== (unsigned short) -1)
2653 /* ELF symbols in relocateable files are section relative,
2654 but in nonrelocateable files they are virtual
2656 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
2657 if (! finfo
->info
->relocateable
)
2658 sym
.st_value
+= input_sec
->output_section
->vma
;
2662 BFD_ASSERT ((bfd_get_flavour (input_sec
->owner
)
2663 == bfd_target_elf_flavour
)
2664 && elf_elfheader (input_sec
->owner
)->e_type
== ET_DYN
);
2665 sym
.st_shndx
= SHN_UNDEF
;
2666 input_sec
= bfd_und_section_ptr
;
2671 case bfd_link_hash_common
:
2672 input_sec
= bfd_com_section_ptr
;
2673 sym
.st_shndx
= SHN_COMMON
;
2674 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
2677 case bfd_link_hash_indirect
:
2678 case bfd_link_hash_warning
:
2679 /* We can't represent these symbols in ELF. A warning symbol
2680 may have come from a .gnu.warning.SYMBOL section anyhow. We
2681 just put the target symbol in the hash table. If the target
2682 symbol does not really exist, don't do anything. */
2683 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
2685 return (elf_link_output_extsym
2686 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
2689 /* If this symbol should be put in the .dynsym section, then put it
2690 there now. We have already know the symbol index. We also fill
2691 in the entry in the .hash section. */
2692 if (h
->dynindx
!= -1
2693 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
2695 struct elf_backend_data
*bed
;
2698 bfd_byte
*bucketpos
;
2701 sym
.st_name
= h
->dynstr_index
;
2703 /* Give the processor backend a chance to tweak the symbol
2704 value, and also to finish up anything that needs to be done
2706 bed
= get_elf_backend_data (finfo
->output_bfd
);
2707 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
2708 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
2714 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
2715 (PTR
) (((Elf_External_Sym
*)
2716 finfo
->dynsym_sec
->contents
)
2719 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
2720 bucket
= (bfd_elf_hash ((const unsigned char *) h
->root
.root
.string
)
2722 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
2723 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
2724 chain
= get_word (finfo
->output_bfd
, bucketpos
);
2725 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
2726 put_word (finfo
->output_bfd
, chain
,
2727 ((bfd_byte
*) finfo
->hash_sec
->contents
2728 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
2731 /* If we're stripping it, then it was just a dynamic symbol, and
2732 there's nothing else to do. */
2736 h
->indx
= finfo
->output_bfd
->symcount
;
2738 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
2747 /* Link an input file into the linker output file. This function
2748 handles all the sections and relocations of the input file at once.
2749 This is so that we only have to read the local symbols once, and
2750 don't have to keep them in memory. */
2753 elf_link_input_bfd (finfo
, input_bfd
)
2754 struct elf_final_link_info
*finfo
;
2757 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
2758 bfd
*, asection
*, bfd_byte
*,
2759 Elf_Internal_Rela
*,
2760 Elf_Internal_Sym
*, asection
**));
2762 Elf_Internal_Shdr
*symtab_hdr
;
2765 Elf_External_Sym
*external_syms
;
2766 Elf_External_Sym
*esym
;
2767 Elf_External_Sym
*esymend
;
2768 Elf_Internal_Sym
*isym
;
2770 asection
**ppsection
;
2773 output_bfd
= finfo
->output_bfd
;
2775 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
2777 /* If this is a dynamic object, we don't want to do anything here:
2778 we don't want the local symbols, and we don't want the section
2780 if (elf_elfheader (input_bfd
)->e_type
== ET_DYN
)
2783 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2784 if (elf_bad_symtab (input_bfd
))
2786 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
2791 locsymcount
= symtab_hdr
->sh_info
;
2792 extsymoff
= symtab_hdr
->sh_info
;
2795 /* Read the local symbols. */
2796 if (symtab_hdr
->contents
!= NULL
)
2797 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
2798 else if (locsymcount
== 0)
2799 external_syms
= NULL
;
2802 external_syms
= finfo
->external_syms
;
2803 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
2804 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
2805 locsymcount
, input_bfd
)
2806 != locsymcount
* sizeof (Elf_External_Sym
)))
2810 /* Swap in the local symbols and write out the ones which we know
2811 are going into the output file. */
2812 esym
= external_syms
;
2813 esymend
= esym
+ locsymcount
;
2814 isym
= finfo
->internal_syms
;
2815 pindex
= finfo
->indices
;
2816 ppsection
= finfo
->sections
;
2817 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
2821 Elf_Internal_Sym osym
;
2823 elf_swap_symbol_in (input_bfd
, esym
, isym
);
2826 if (elf_bad_symtab (input_bfd
))
2828 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
2835 if (isym
->st_shndx
== SHN_UNDEF
)
2836 isec
= bfd_und_section_ptr
;
2837 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
2838 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
2839 else if (isym
->st_shndx
== SHN_ABS
)
2840 isec
= bfd_abs_section_ptr
;
2841 else if (isym
->st_shndx
== SHN_COMMON
)
2842 isec
= bfd_com_section_ptr
;
2851 /* Don't output the first, undefined, symbol. */
2852 if (esym
== external_syms
)
2855 /* If we are stripping all symbols, we don't want to output this
2857 if (finfo
->info
->strip
== strip_all
)
2860 /* We never output section symbols. Instead, we use the section
2861 symbol of the corresponding section in the output file. */
2862 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
2865 /* If we are discarding all local symbols, we don't want to
2866 output this one. If we are generating a relocateable output
2867 file, then some of the local symbols may be required by
2868 relocs; we output them below as we discover that they are
2870 if (finfo
->info
->discard
== discard_all
)
2873 /* Get the name of the symbol. */
2874 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
2879 /* See if we are discarding symbols with this name. */
2880 if ((finfo
->info
->strip
== strip_some
2881 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
2883 || (finfo
->info
->discard
== discard_l
2884 && strncmp (name
, finfo
->info
->lprefix
,
2885 finfo
->info
->lprefix_len
) == 0))
2888 /* If we get here, we are going to output this symbol. */
2892 /* Adjust the section index for the output file. */
2893 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
2894 isec
->output_section
);
2895 if (osym
.st_shndx
== (unsigned short) -1)
2898 *pindex
= output_bfd
->symcount
;
2900 /* ELF symbols in relocateable files are section relative, but
2901 in executable files they are virtual addresses. Note that
2902 this code assumes that all ELF sections have an associated
2903 BFD section with a reasonable value for output_offset; below
2904 we assume that they also have a reasonable value for
2905 output_section. Any special sections must be set up to meet
2906 these requirements. */
2907 osym
.st_value
+= isec
->output_offset
;
2908 if (! finfo
->info
->relocateable
)
2909 osym
.st_value
+= isec
->output_section
->vma
;
2911 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
2915 /* Relocate the contents of each section. */
2916 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
2920 if (! o
->linker_mark
)
2922 /* This section was omitted from the link. */
2926 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
2927 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
2930 if ((o
->flags
& SEC_IN_MEMORY
) != 0
2931 && input_bfd
== elf_hash_table (finfo
->info
)->dynobj
)
2933 /* Section was created by elf_link_create_dynamic_sections.
2934 FIXME: This test is fragile. */
2938 /* Get the contents of the section. They have been cached by a
2939 relaxation routine. Note that o is a section in an input
2940 file, so the contents field will not have been set by any of
2941 the routines which work on output files. */
2942 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
2943 contents
= elf_section_data (o
)->this_hdr
.contents
;
2946 contents
= finfo
->contents
;
2947 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
2948 (file_ptr
) 0, o
->_raw_size
))
2952 if ((o
->flags
& SEC_RELOC
) != 0)
2954 Elf_Internal_Rela
*internal_relocs
;
2956 /* Get the swapped relocs. */
2957 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2958 (input_bfd
, o
, finfo
->external_relocs
,
2959 finfo
->internal_relocs
, false));
2960 if (internal_relocs
== NULL
2961 && o
->reloc_count
> 0)
2964 /* Relocate the section by invoking a back end routine.
2966 The back end routine is responsible for adjusting the
2967 section contents as necessary, and (if using Rela relocs
2968 and generating a relocateable output file) adjusting the
2969 reloc addend as necessary.
2971 The back end routine does not have to worry about setting
2972 the reloc address or the reloc symbol index.
2974 The back end routine is given a pointer to the swapped in
2975 internal symbols, and can access the hash table entries
2976 for the external symbols via elf_sym_hashes (input_bfd).
2978 When generating relocateable output, the back end routine
2979 must handle STB_LOCAL/STT_SECTION symbols specially. The
2980 output symbol is going to be a section symbol
2981 corresponding to the output section, which will require
2982 the addend to be adjusted. */
2984 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
2985 input_bfd
, o
, contents
,
2987 finfo
->internal_syms
,
2991 if (finfo
->info
->relocateable
)
2993 Elf_Internal_Rela
*irela
;
2994 Elf_Internal_Rela
*irelaend
;
2995 struct elf_link_hash_entry
**rel_hash
;
2996 Elf_Internal_Shdr
*input_rel_hdr
;
2997 Elf_Internal_Shdr
*output_rel_hdr
;
2999 /* Adjust the reloc addresses and symbol indices. */
3001 irela
= internal_relocs
;
3002 irelaend
= irela
+ o
->reloc_count
;
3003 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
3004 + o
->output_section
->reloc_count
);
3005 for (; irela
< irelaend
; irela
++, rel_hash
++)
3007 unsigned long r_symndx
;
3008 Elf_Internal_Sym
*isym
;
3011 irela
->r_offset
+= o
->output_offset
;
3013 r_symndx
= ELF_R_SYM (irela
->r_info
);
3018 if (r_symndx
>= locsymcount
3019 || (elf_bad_symtab (input_bfd
)
3020 && finfo
->sections
[r_symndx
] == NULL
))
3024 /* This is a reloc against a global symbol. We
3025 have not yet output all the local symbols, so
3026 we do not know the symbol index of any global
3027 symbol. We set the rel_hash entry for this
3028 reloc to point to the global hash table entry
3029 for this symbol. The symbol index is then
3030 set at the end of elf_bfd_final_link. */
3031 indx
= r_symndx
- extsymoff
;
3032 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
3034 /* Setting the index to -2 tells
3035 elf_link_output_extsym that this symbol is
3037 BFD_ASSERT ((*rel_hash
)->indx
< 0);
3038 (*rel_hash
)->indx
= -2;
3043 /* This is a reloc against a local symbol. */
3046 isym
= finfo
->internal_syms
+ r_symndx
;
3047 sec
= finfo
->sections
[r_symndx
];
3048 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
3050 /* I suppose the backend ought to fill in the
3051 section of any STT_SECTION symbol against a
3052 processor specific section. */
3053 if (sec
!= NULL
&& bfd_is_abs_section (sec
))
3055 else if (sec
== NULL
|| sec
->owner
== NULL
)
3057 bfd_set_error (bfd_error_bad_value
);
3062 r_symndx
= sec
->output_section
->target_index
;
3063 BFD_ASSERT (r_symndx
!= 0);
3068 if (finfo
->indices
[r_symndx
] == -1)
3074 if (finfo
->info
->strip
== strip_all
)
3076 /* You can't do ld -r -s. */
3077 bfd_set_error (bfd_error_invalid_operation
);
3081 /* This symbol was skipped earlier, but
3082 since it is needed by a reloc, we
3083 must output it now. */
3084 link
= symtab_hdr
->sh_link
;
3085 name
= bfd_elf_string_from_elf_section (input_bfd
,
3091 osec
= sec
->output_section
;
3093 _bfd_elf_section_from_bfd_section (output_bfd
,
3095 if (isym
->st_shndx
== (unsigned short) -1)
3098 isym
->st_value
+= sec
->output_offset
;
3099 if (! finfo
->info
->relocateable
)
3100 isym
->st_value
+= osec
->vma
;
3102 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
3104 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
3108 r_symndx
= finfo
->indices
[r_symndx
];
3111 irela
->r_info
= ELF_R_INFO (r_symndx
,
3112 ELF_R_TYPE (irela
->r_info
));
3115 /* Swap out the relocs. */
3116 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3117 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
3118 BFD_ASSERT (output_rel_hdr
->sh_entsize
3119 == input_rel_hdr
->sh_entsize
);
3120 irela
= internal_relocs
;
3121 irelaend
= irela
+ o
->reloc_count
;
3122 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3124 Elf_External_Rel
*erel
;
3126 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
3127 + o
->output_section
->reloc_count
);
3128 for (; irela
< irelaend
; irela
++, erel
++)
3130 Elf_Internal_Rel irel
;
3132 irel
.r_offset
= irela
->r_offset
;
3133 irel
.r_info
= irela
->r_info
;
3134 BFD_ASSERT (irela
->r_addend
== 0);
3135 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3140 Elf_External_Rela
*erela
;
3142 BFD_ASSERT (input_rel_hdr
->sh_entsize
3143 == sizeof (Elf_External_Rela
));
3144 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
3145 + o
->output_section
->reloc_count
);
3146 for (; irela
< irelaend
; irela
++, erela
++)
3147 elf_swap_reloca_out (output_bfd
, irela
, erela
);
3150 o
->output_section
->reloc_count
+= o
->reloc_count
;
3154 /* Write out the modified section contents. */
3155 if (elf_section_data (o
)->stab_info
== NULL
)
3157 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
3158 contents
, o
->output_offset
,
3159 (o
->_cooked_size
!= 0
3166 if (! _bfd_write_section_stabs (output_bfd
, o
,
3167 &elf_section_data (o
)->stab_info
,
3176 /* Generate a reloc when linking an ELF file. This is a reloc
3177 requested by the linker, and does come from any input file. This
3178 is used to build constructor and destructor tables when linking
3182 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
3184 struct bfd_link_info
*info
;
3185 asection
*output_section
;
3186 struct bfd_link_order
*link_order
;
3188 reloc_howto_type
*howto
;
3192 struct elf_link_hash_entry
**rel_hash_ptr
;
3193 Elf_Internal_Shdr
*rel_hdr
;
3195 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
3198 bfd_set_error (bfd_error_bad_value
);
3202 addend
= link_order
->u
.reloc
.p
->addend
;
3204 /* Figure out the symbol index. */
3205 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
3206 + output_section
->reloc_count
);
3207 if (link_order
->type
== bfd_section_reloc_link_order
)
3209 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
3210 BFD_ASSERT (indx
!= 0);
3211 *rel_hash_ptr
= NULL
;
3215 struct elf_link_hash_entry
*h
;
3217 /* Treat a reloc against a defined symbol as though it were
3218 actually against the section. */
3219 h
= ((struct elf_link_hash_entry
*)
3220 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
3221 link_order
->u
.reloc
.p
->u
.name
,
3222 false, false, true));
3224 && (h
->root
.type
== bfd_link_hash_defined
3225 || h
->root
.type
== bfd_link_hash_defweak
))
3229 section
= h
->root
.u
.def
.section
;
3230 indx
= section
->output_section
->target_index
;
3231 *rel_hash_ptr
= NULL
;
3232 /* It seems that we ought to add the symbol value to the
3233 addend here, but in practice it has already been added
3234 because it was passed to constructor_callback. */
3235 addend
+= section
->output_section
->vma
+ section
->output_offset
;
3239 /* Setting the index to -2 tells elf_link_output_extsym that
3240 this symbol is used by a reloc. */
3247 if (! ((*info
->callbacks
->unattached_reloc
)
3248 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
3249 (asection
*) NULL
, (bfd_vma
) 0)))
3255 /* If this is an inplace reloc, we must write the addend into the
3257 if (howto
->partial_inplace
&& addend
!= 0)
3260 bfd_reloc_status_type rstat
;
3264 size
= bfd_get_reloc_size (howto
);
3265 buf
= (bfd_byte
*) bfd_zmalloc (size
);
3266 if (buf
== (bfd_byte
*) NULL
)
3268 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
3274 case bfd_reloc_outofrange
:
3276 case bfd_reloc_overflow
:
3277 if (! ((*info
->callbacks
->reloc_overflow
)
3279 (link_order
->type
== bfd_section_reloc_link_order
3280 ? bfd_section_name (output_bfd
,
3281 link_order
->u
.reloc
.p
->u
.section
)
3282 : link_order
->u
.reloc
.p
->u
.name
),
3283 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
3291 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
3292 (file_ptr
) link_order
->offset
, size
);
3298 /* The address of a reloc is relative to the section in a
3299 relocateable file, and is a virtual address in an executable
3301 offset
= link_order
->offset
;
3302 if (! info
->relocateable
)
3303 offset
+= output_section
->vma
;
3305 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
3307 if (rel_hdr
->sh_type
== SHT_REL
)
3309 Elf_Internal_Rel irel
;
3310 Elf_External_Rel
*erel
;
3312 irel
.r_offset
= offset
;
3313 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3314 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
3315 + output_section
->reloc_count
);
3316 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3320 Elf_Internal_Rela irela
;
3321 Elf_External_Rela
*erela
;
3323 irela
.r_offset
= offset
;
3324 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3325 irela
.r_addend
= addend
;
3326 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
3327 + output_section
->reloc_count
);
3328 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
3331 ++output_section
->reloc_count
;
3337 /* Allocate a pointer to live in a linker created section. */
3340 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
3342 struct bfd_link_info
*info
;
3343 elf_linker_section_t
*lsect
;
3344 struct elf_link_hash_entry
*h
;
3345 const Elf_Internal_Rela
*rel
;
3347 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
3348 elf_linker_section_pointers_t
*linker_section_ptr
;
3349 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
3351 BFD_ASSERT (lsect
!= NULL
);
3353 /* Is this a global symbol? */
3356 /* Has this symbol already been allocated, if so, our work is done */
3357 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3362 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
3363 /* Make sure this symbol is output as a dynamic symbol. */
3364 if (h
->dynindx
== -1)
3366 if (! elf_link_record_dynamic_symbol (info
, h
))
3370 if (lsect
->rel_section
)
3371 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3374 else /* Allocation of a pointer to a local symbol */
3376 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
3378 /* Allocate a table to hold the local symbols if first time */
3381 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
3382 register unsigned int i
;
3384 ptr
= (elf_linker_section_pointers_t
**)
3385 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
3390 elf_local_ptr_offsets (abfd
) = ptr
;
3391 for (i
= 0; i
< num_symbols
; i
++)
3392 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
3395 /* Has this symbol already been allocated, if so, our work is done */
3396 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
3401 ptr_linker_section_ptr
= &ptr
[r_symndx
];
3405 /* If we are generating a shared object, we need to
3406 output a R_<xxx>_RELATIVE reloc so that the
3407 dynamic linker can adjust this GOT entry. */
3408 BFD_ASSERT (lsect
->rel_section
!= NULL
);
3409 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3413 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
3414 from internal memory. */
3415 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
3416 linker_section_ptr
= (elf_linker_section_pointers_t
*)
3417 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
3419 if (!linker_section_ptr
)
3422 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
3423 linker_section_ptr
->addend
= rel
->r_addend
;
3424 linker_section_ptr
->which
= lsect
->which
;
3425 linker_section_ptr
->written_address_p
= false;
3426 *ptr_linker_section_ptr
= linker_section_ptr
;
3429 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
3431 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
3432 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
3433 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
3434 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
3436 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
3438 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
3439 lsect
->sym_hash
->root
.root
.string
,
3440 (long)ARCH_SIZE
/ 8,
3441 (long)lsect
->sym_hash
->root
.u
.def
.value
);
3447 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
3449 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
3452 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
3453 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
3461 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
3464 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
3467 /* Fill in the address for a pointer generated in alinker section. */
3470 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
3473 struct bfd_link_info
*info
;
3474 elf_linker_section_t
*lsect
;
3475 struct elf_link_hash_entry
*h
;
3477 const Elf_Internal_Rela
*rel
;
3480 elf_linker_section_pointers_t
*linker_section_ptr
;
3482 BFD_ASSERT (lsect
!= NULL
);
3484 if (h
!= NULL
) /* global symbol */
3486 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3490 BFD_ASSERT (linker_section_ptr
!= NULL
);
3492 if (! elf_hash_table (info
)->dynamic_sections_created
3495 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
3497 /* This is actually a static link, or it is a
3498 -Bsymbolic link and the symbol is defined
3499 locally. We must initialize this entry in the
3502 When doing a dynamic link, we create a .rela.<xxx>
3503 relocation entry to initialize the value. This
3504 is done in the finish_dynamic_symbol routine. */
3505 if (!linker_section_ptr
->written_address_p
)
3507 linker_section_ptr
->written_address_p
= true;
3508 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3509 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3513 else /* local symbol */
3515 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
3516 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
3517 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
3518 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
3522 BFD_ASSERT (linker_section_ptr
!= NULL
);
3524 /* Write out pointer if it hasn't been rewritten out before */
3525 if (!linker_section_ptr
->written_address_p
)
3527 linker_section_ptr
->written_address_p
= true;
3528 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3529 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3533 asection
*srel
= lsect
->rel_section
;
3534 Elf_Internal_Rela outrel
;
3536 /* We need to generate a relative reloc for the dynamic linker. */
3538 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
3541 BFD_ASSERT (srel
!= NULL
);
3543 outrel
.r_offset
= (lsect
->section
->output_section
->vma
3544 + lsect
->section
->output_offset
3545 + linker_section_ptr
->offset
);
3546 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
3547 outrel
.r_addend
= 0;
3548 elf_swap_reloca_out (output_bfd
, &outrel
,
3549 (((Elf_External_Rela
*)
3550 lsect
->section
->contents
)
3551 + lsect
->section
->reloc_count
));
3552 ++lsect
->section
->reloc_count
;
3557 relocation
= (lsect
->section
->output_offset
3558 + linker_section_ptr
->offset
3559 - lsect
->hole_offset
3560 - lsect
->sym_offset
);
3563 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
3564 lsect
->name
, (long)relocation
, (long)relocation
);
3567 /* Subtract out the addend, because it will get added back in by the normal
3569 return relocation
- linker_section_ptr
->addend
;