1 /* 32-bit ELF support for ARM
2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 typedef unsigned long int insn32
;
26 typedef unsigned short int insn16
;
28 /* In leiu of proper flags, assume all EABIv3 objects are interworkable. */
29 #define INTERWORK_FLAG(abfd) \
30 (EF_ARM_EABI_VERSION (elf_elfheader (abfd)->e_flags) == EF_ARM_EABI_VER3 \
31 || (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK))
33 /* The linker script knows the section names for placement.
34 The entry_names are used to do simple name mangling on the stubs.
35 Given a function name, and its type, the stub can be found. The
36 name can be changed. The only requirement is the %s be present. */
37 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
38 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
40 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
41 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
43 /* The name of the dynamic interpreter. This is put in the .interp
45 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
49 /* The first entry in a procedure linkage table looks like
50 this. It is set up so that any shared library function that is
51 called before the relocation has been set up calls the dynamic
53 static const bfd_vma elf32_arm_plt0_entry
[] =
55 0xe52de004, /* str lr, [sp, #-4]! */
56 0xe59fe010, /* ldr lr, [pc, #16] */
57 0xe08fe00e, /* add lr, pc, lr */
58 0xe5bef008, /* ldr pc, [lr, #8]! */
61 /* Subsequent entries in a procedure linkage table look like
63 static const bfd_vma elf32_arm_plt_entry
[] =
65 0xe28fc600, /* add ip, pc, #NN */
66 0xe28cca00, /* add ip, ip, #NN */
67 0xe5bcf000, /* ldr pc, [ip, #NN]! */
68 0x00000000, /* unused */
73 /* The first entry in a procedure linkage table looks like
74 this. It is set up so that any shared library function that is
75 called before the relocation has been set up calls the dynamic
77 static const bfd_vma elf32_arm_plt0_entry
[] =
79 0xe52de004, /* str lr, [sp, #-4]! */
80 0xe59fe004, /* ldr lr, [pc, #4] */
81 0xe08fe00e, /* add lr, pc, lr */
82 0xe5bef008, /* ldr pc, [lr, #8]! */
83 0x00000000, /* &GOT[0] - . */
86 /* Subsequent entries in a procedure linkage table look like
88 static const bfd_vma elf32_arm_plt_entry
[] =
90 0xe28fc600, /* add ip, pc, #0xNN00000 */
91 0xe28cca00, /* add ip, ip, #0xNN000 */
92 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */
97 /* The entries in a PLT when using a DLL-based target with multiple
99 static const bfd_vma elf32_arm_symbian_plt_entry
[] =
101 0xe51ff004, /* ldr pr, [pc, #-4] */
102 0x00000000, /* dcd R_ARM_GLOB_DAT(X) */
105 /* Used to build a map of a section. This is required for mixed-endian
108 typedef struct elf32_elf_section_map
113 elf32_arm_section_map
;
115 struct _arm_elf_section_data
117 struct bfd_elf_section_data elf
;
119 elf32_arm_section_map
*map
;
122 #define elf32_arm_section_data(sec) \
123 ((struct _arm_elf_section_data *) elf_section_data (sec))
125 /* The ARM linker needs to keep track of the number of relocs that it
126 decides to copy in check_relocs for each symbol. This is so that
127 it can discard PC relative relocs if it doesn't need them when
128 linking with -Bsymbolic. We store the information in a field
129 extending the regular ELF linker hash table. */
131 /* This structure keeps track of the number of PC relative relocs we
132 have copied for a given symbol. */
133 struct elf32_arm_relocs_copied
136 struct elf32_arm_relocs_copied
* next
;
137 /* A section in dynobj. */
139 /* Number of relocs copied in this section. */
143 /* Arm ELF linker hash entry. */
144 struct elf32_arm_link_hash_entry
146 struct elf_link_hash_entry root
;
148 /* Number of PC relative relocs copied for this symbol. */
149 struct elf32_arm_relocs_copied
* relocs_copied
;
152 /* Traverse an arm ELF linker hash table. */
153 #define elf32_arm_link_hash_traverse(table, func, info) \
154 (elf_link_hash_traverse \
156 (bfd_boolean (*) (struct elf_link_hash_entry *, void *))) (func), \
159 /* Get the ARM elf linker hash table from a link_info structure. */
160 #define elf32_arm_hash_table(info) \
161 ((struct elf32_arm_link_hash_table *) ((info)->hash))
163 /* ARM ELF linker hash table. */
164 struct elf32_arm_link_hash_table
166 /* The main hash table. */
167 struct elf_link_hash_table root
;
169 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
170 bfd_size_type thumb_glue_size
;
172 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
173 bfd_size_type arm_glue_size
;
175 /* An arbitrary input BFD chosen to hold the glue sections. */
176 bfd
* bfd_of_glue_owner
;
178 /* A boolean indicating whether knowledge of the ARM's pipeline
179 length should be applied by the linker. */
180 int no_pipeline_knowledge
;
182 /* Nonzero to output a BE8 image. */
185 /* Zero if R_ARM_TARGET1 means R_ARM_ABS32.
186 Nonzero if R_ARM_TARGET1 means R_ARM_ABS32. */
189 /* The number of bytes in the initial entry in the PLT. */
190 bfd_size_type plt_header_size
;
192 /* The number of bytes in the subsequent PLT etries. */
193 bfd_size_type plt_entry_size
;
195 /* True if the target system is Symbian OS. */
198 /* Short-cuts to get to dynamic linker sections. */
207 /* Small local sym to section mapping cache. */
208 struct sym_sec_cache sym_sec
;
211 /* Create an entry in an ARM ELF linker hash table. */
213 static struct bfd_hash_entry
*
214 elf32_arm_link_hash_newfunc (struct bfd_hash_entry
* entry
,
215 struct bfd_hash_table
* table
,
218 struct elf32_arm_link_hash_entry
* ret
=
219 (struct elf32_arm_link_hash_entry
*) entry
;
221 /* Allocate the structure if it has not already been allocated by a
223 if (ret
== (struct elf32_arm_link_hash_entry
*) NULL
)
224 ret
= bfd_hash_allocate (table
, sizeof (struct elf32_arm_link_hash_entry
));
226 return (struct bfd_hash_entry
*) ret
;
228 /* Call the allocation method of the superclass. */
229 ret
= ((struct elf32_arm_link_hash_entry
*)
230 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry
*) ret
,
233 ret
->relocs_copied
= NULL
;
235 return (struct bfd_hash_entry
*) ret
;
238 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
239 shortcuts to them in our hash table. */
242 create_got_section (bfd
*dynobj
, struct bfd_link_info
*info
)
244 struct elf32_arm_link_hash_table
*htab
;
246 htab
= elf32_arm_hash_table (info
);
247 /* BPABI objects never have a GOT, or associated sections. */
251 if (! _bfd_elf_create_got_section (dynobj
, info
))
254 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
255 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
256 if (!htab
->sgot
|| !htab
->sgotplt
)
259 htab
->srelgot
= bfd_make_section (dynobj
, ".rel.got");
260 if (htab
->srelgot
== NULL
261 || ! bfd_set_section_flags (dynobj
, htab
->srelgot
,
262 (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
263 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
265 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
270 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
271 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
275 elf32_arm_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
277 struct elf32_arm_link_hash_table
*htab
;
279 htab
= elf32_arm_hash_table (info
);
280 if (!htab
->sgot
&& !create_got_section (dynobj
, info
))
283 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
286 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
287 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rel.plt");
288 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
290 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rel.bss");
295 || (!info
->shared
&& !htab
->srelbss
))
301 /* Copy the extra info we tack onto an elf_link_hash_entry. */
304 elf32_arm_copy_indirect_symbol (const struct elf_backend_data
*bed
,
305 struct elf_link_hash_entry
*dir
,
306 struct elf_link_hash_entry
*ind
)
308 struct elf32_arm_link_hash_entry
*edir
, *eind
;
310 edir
= (struct elf32_arm_link_hash_entry
*) dir
;
311 eind
= (struct elf32_arm_link_hash_entry
*) ind
;
313 if (eind
->relocs_copied
!= NULL
)
315 if (edir
->relocs_copied
!= NULL
)
317 struct elf32_arm_relocs_copied
**pp
;
318 struct elf32_arm_relocs_copied
*p
;
320 if (ind
->root
.type
== bfd_link_hash_indirect
)
323 /* Add reloc counts against the weak sym to the strong sym
324 list. Merge any entries against the same section. */
325 for (pp
= &eind
->relocs_copied
; (p
= *pp
) != NULL
; )
327 struct elf32_arm_relocs_copied
*q
;
329 for (q
= edir
->relocs_copied
; q
!= NULL
; q
= q
->next
)
330 if (q
->section
== p
->section
)
332 q
->count
+= p
->count
;
339 *pp
= edir
->relocs_copied
;
342 edir
->relocs_copied
= eind
->relocs_copied
;
343 eind
->relocs_copied
= NULL
;
346 _bfd_elf_link_hash_copy_indirect (bed
, dir
, ind
);
349 /* Create an ARM elf linker hash table. */
351 static struct bfd_link_hash_table
*
352 elf32_arm_link_hash_table_create (bfd
*abfd
)
354 struct elf32_arm_link_hash_table
*ret
;
355 bfd_size_type amt
= sizeof (struct elf32_arm_link_hash_table
);
357 ret
= bfd_malloc (amt
);
361 if (!_bfd_elf_link_hash_table_init (& ret
->root
, abfd
,
362 elf32_arm_link_hash_newfunc
))
375 ret
->thumb_glue_size
= 0;
376 ret
->arm_glue_size
= 0;
377 ret
->bfd_of_glue_owner
= NULL
;
378 ret
->no_pipeline_knowledge
= 0;
379 ret
->byteswap_code
= 0;
380 ret
->target1_is_rel
= 0;
382 ret
->plt_header_size
= 16;
383 ret
->plt_entry_size
= 16;
385 ret
->plt_header_size
= 20;
386 ret
->plt_entry_size
= 12;
389 ret
->sym_sec
.abfd
= NULL
;
391 return &ret
->root
.root
;
394 /* Locate the Thumb encoded calling stub for NAME. */
396 static struct elf_link_hash_entry
*
397 find_thumb_glue (struct bfd_link_info
*link_info
,
402 struct elf_link_hash_entry
*hash
;
403 struct elf32_arm_link_hash_table
*hash_table
;
405 /* We need a pointer to the armelf specific hash table. */
406 hash_table
= elf32_arm_hash_table (link_info
);
408 tmp_name
= bfd_malloc ((bfd_size_type
) strlen (name
)
409 + strlen (THUMB2ARM_GLUE_ENTRY_NAME
) + 1);
411 BFD_ASSERT (tmp_name
);
413 sprintf (tmp_name
, THUMB2ARM_GLUE_ENTRY_NAME
, name
);
415 hash
= elf_link_hash_lookup
416 (&(hash_table
)->root
, tmp_name
, FALSE
, FALSE
, TRUE
);
419 /* xgettext:c-format */
420 (*_bfd_error_handler
) (_("%B: unable to find THUMB glue '%s' for `%s'"),
421 input_bfd
, tmp_name
, name
);
428 /* Locate the ARM encoded calling stub for NAME. */
430 static struct elf_link_hash_entry
*
431 find_arm_glue (struct bfd_link_info
*link_info
,
436 struct elf_link_hash_entry
*myh
;
437 struct elf32_arm_link_hash_table
*hash_table
;
439 /* We need a pointer to the elfarm specific hash table. */
440 hash_table
= elf32_arm_hash_table (link_info
);
442 tmp_name
= bfd_malloc ((bfd_size_type
) strlen (name
)
443 + strlen (ARM2THUMB_GLUE_ENTRY_NAME
) + 1);
445 BFD_ASSERT (tmp_name
);
447 sprintf (tmp_name
, ARM2THUMB_GLUE_ENTRY_NAME
, name
);
449 myh
= elf_link_hash_lookup
450 (&(hash_table
)->root
, tmp_name
, FALSE
, FALSE
, TRUE
);
453 /* xgettext:c-format */
454 (*_bfd_error_handler
) (_("%B: unable to find ARM glue '%s' for `%s'"),
455 input_bfd
, tmp_name
, name
);
469 .word func @ behave as if you saw a ARM_32 reloc. */
471 #define ARM2THUMB_GLUE_SIZE 12
472 static const insn32 a2t1_ldr_insn
= 0xe59fc000;
473 static const insn32 a2t2_bx_r12_insn
= 0xe12fff1c;
474 static const insn32 a2t3_func_addr_insn
= 0x00000001;
476 /* Thumb->ARM: Thumb->(non-interworking aware) ARM
480 __func_from_thumb: __func_from_thumb:
482 nop ldr r6, __func_addr
484 __func_change_to_arm: bx r6
486 __func_back_to_thumb:
492 #define THUMB2ARM_GLUE_SIZE 8
493 static const insn16 t2a1_bx_pc_insn
= 0x4778;
494 static const insn16 t2a2_noop_insn
= 0x46c0;
495 static const insn32 t2a3_b_insn
= 0xea000000;
497 #ifndef ELFARM_NABI_C_INCLUDED
499 bfd_elf32_arm_allocate_interworking_sections (struct bfd_link_info
* info
)
503 struct elf32_arm_link_hash_table
* globals
;
505 globals
= elf32_arm_hash_table (info
);
507 BFD_ASSERT (globals
!= NULL
);
509 if (globals
->arm_glue_size
!= 0)
511 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
513 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
514 ARM2THUMB_GLUE_SECTION_NAME
);
516 BFD_ASSERT (s
!= NULL
);
518 foo
= bfd_alloc (globals
->bfd_of_glue_owner
, globals
->arm_glue_size
);
520 s
->size
= globals
->arm_glue_size
;
524 if (globals
->thumb_glue_size
!= 0)
526 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
528 s
= bfd_get_section_by_name
529 (globals
->bfd_of_glue_owner
, THUMB2ARM_GLUE_SECTION_NAME
);
531 BFD_ASSERT (s
!= NULL
);
533 foo
= bfd_alloc (globals
->bfd_of_glue_owner
, globals
->thumb_glue_size
);
535 s
->size
= globals
->thumb_glue_size
;
543 record_arm_to_thumb_glue (struct bfd_link_info
* link_info
,
544 struct elf_link_hash_entry
* h
)
546 const char * name
= h
->root
.root
.string
;
549 struct elf_link_hash_entry
* myh
;
550 struct bfd_link_hash_entry
* bh
;
551 struct elf32_arm_link_hash_table
* globals
;
554 globals
= elf32_arm_hash_table (link_info
);
556 BFD_ASSERT (globals
!= NULL
);
557 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
559 s
= bfd_get_section_by_name
560 (globals
->bfd_of_glue_owner
, ARM2THUMB_GLUE_SECTION_NAME
);
562 BFD_ASSERT (s
!= NULL
);
564 tmp_name
= bfd_malloc ((bfd_size_type
) strlen (name
) + strlen (ARM2THUMB_GLUE_ENTRY_NAME
) + 1);
566 BFD_ASSERT (tmp_name
);
568 sprintf (tmp_name
, ARM2THUMB_GLUE_ENTRY_NAME
, name
);
570 myh
= elf_link_hash_lookup
571 (&(globals
)->root
, tmp_name
, FALSE
, FALSE
, TRUE
);
575 /* We've already seen this guy. */
580 /* The only trick here is using hash_table->arm_glue_size as the value.
581 Even though the section isn't allocated yet, this is where we will be
584 val
= globals
->arm_glue_size
+ 1;
585 _bfd_generic_link_add_one_symbol (link_info
, globals
->bfd_of_glue_owner
,
586 tmp_name
, BSF_GLOBAL
, s
, val
,
587 NULL
, TRUE
, FALSE
, &bh
);
591 globals
->arm_glue_size
+= ARM2THUMB_GLUE_SIZE
;
597 record_thumb_to_arm_glue (struct bfd_link_info
*link_info
,
598 struct elf_link_hash_entry
*h
)
600 const char *name
= h
->root
.root
.string
;
603 struct elf_link_hash_entry
*myh
;
604 struct bfd_link_hash_entry
*bh
;
605 struct elf32_arm_link_hash_table
*hash_table
;
609 hash_table
= elf32_arm_hash_table (link_info
);
611 BFD_ASSERT (hash_table
!= NULL
);
612 BFD_ASSERT (hash_table
->bfd_of_glue_owner
!= NULL
);
614 s
= bfd_get_section_by_name
615 (hash_table
->bfd_of_glue_owner
, THUMB2ARM_GLUE_SECTION_NAME
);
617 BFD_ASSERT (s
!= NULL
);
619 tmp_name
= bfd_malloc ((bfd_size_type
) strlen (name
)
620 + strlen (THUMB2ARM_GLUE_ENTRY_NAME
) + 1);
622 BFD_ASSERT (tmp_name
);
624 sprintf (tmp_name
, THUMB2ARM_GLUE_ENTRY_NAME
, name
);
626 myh
= elf_link_hash_lookup
627 (&(hash_table
)->root
, tmp_name
, FALSE
, FALSE
, TRUE
);
631 /* We've already seen this guy. */
637 val
= hash_table
->thumb_glue_size
+ 1;
638 _bfd_generic_link_add_one_symbol (link_info
, hash_table
->bfd_of_glue_owner
,
639 tmp_name
, BSF_GLOBAL
, s
, val
,
640 NULL
, TRUE
, FALSE
, &bh
);
642 /* If we mark it 'Thumb', the disassembler will do a better job. */
643 myh
= (struct elf_link_hash_entry
*) bh
;
644 bind
= ELF_ST_BIND (myh
->type
);
645 myh
->type
= ELF_ST_INFO (bind
, STT_ARM_TFUNC
);
649 #define CHANGE_TO_ARM "__%s_change_to_arm"
650 #define BACK_FROM_ARM "__%s_back_from_arm"
652 /* Allocate another symbol to mark where we switch to Arm mode. */
653 tmp_name
= bfd_malloc ((bfd_size_type
) strlen (name
)
654 + strlen (CHANGE_TO_ARM
) + 1);
656 BFD_ASSERT (tmp_name
);
658 sprintf (tmp_name
, CHANGE_TO_ARM
, name
);
661 val
= hash_table
->thumb_glue_size
+ 4,
662 _bfd_generic_link_add_one_symbol (link_info
, hash_table
->bfd_of_glue_owner
,
663 tmp_name
, BSF_LOCAL
, s
, val
,
664 NULL
, TRUE
, FALSE
, &bh
);
668 hash_table
->thumb_glue_size
+= THUMB2ARM_GLUE_SIZE
;
673 /* Add the glue sections to ABFD. This function is called from the
674 linker scripts in ld/emultempl/{armelf}.em. */
677 bfd_elf32_arm_add_glue_sections_to_bfd (bfd
*abfd
,
678 struct bfd_link_info
*info
)
683 /* If we are only performing a partial
684 link do not bother adding the glue. */
685 if (info
->relocatable
)
688 sec
= bfd_get_section_by_name (abfd
, ARM2THUMB_GLUE_SECTION_NAME
);
692 /* Note: we do not include the flag SEC_LINKER_CREATED, as this
693 will prevent elf_link_input_bfd() from processing the contents
695 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_CODE
| SEC_READONLY
;
697 sec
= bfd_make_section (abfd
, ARM2THUMB_GLUE_SECTION_NAME
);
700 || !bfd_set_section_flags (abfd
, sec
, flags
)
701 || !bfd_set_section_alignment (abfd
, sec
, 2))
704 /* Set the gc mark to prevent the section from being removed by garbage
705 collection, despite the fact that no relocs refer to this section. */
709 sec
= bfd_get_section_by_name (abfd
, THUMB2ARM_GLUE_SECTION_NAME
);
713 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
714 | SEC_CODE
| SEC_READONLY
;
716 sec
= bfd_make_section (abfd
, THUMB2ARM_GLUE_SECTION_NAME
);
719 || !bfd_set_section_flags (abfd
, sec
, flags
)
720 || !bfd_set_section_alignment (abfd
, sec
, 2))
729 /* Select a BFD to be used to hold the sections used by the glue code.
730 This function is called from the linker scripts in ld/emultempl/
734 bfd_elf32_arm_get_bfd_for_interworking (bfd
*abfd
, struct bfd_link_info
*info
)
736 struct elf32_arm_link_hash_table
*globals
;
738 /* If we are only performing a partial link
739 do not bother getting a bfd to hold the glue. */
740 if (info
->relocatable
)
743 globals
= elf32_arm_hash_table (info
);
745 BFD_ASSERT (globals
!= NULL
);
747 if (globals
->bfd_of_glue_owner
!= NULL
)
750 /* Save the bfd for later use. */
751 globals
->bfd_of_glue_owner
= abfd
;
757 bfd_elf32_arm_process_before_allocation (bfd
*abfd
,
758 struct bfd_link_info
*link_info
,
759 int no_pipeline_knowledge
,
763 Elf_Internal_Shdr
*symtab_hdr
;
764 Elf_Internal_Rela
*internal_relocs
= NULL
;
765 Elf_Internal_Rela
*irel
, *irelend
;
766 bfd_byte
*contents
= NULL
;
769 struct elf32_arm_link_hash_table
*globals
;
771 /* If we are only performing a partial link do not bother
772 to construct any glue. */
773 if (link_info
->relocatable
)
776 /* Here we have a bfd that is to be included on the link. We have a hook
777 to do reloc rummaging, before section sizes are nailed down. */
778 globals
= elf32_arm_hash_table (link_info
);
780 BFD_ASSERT (globals
!= NULL
);
781 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
783 globals
->no_pipeline_knowledge
= no_pipeline_knowledge
;
784 globals
->target1_is_rel
= target1_is_rel
;
785 if (byteswap_code
&& !bfd_big_endian (abfd
))
787 _bfd_error_handler (_("%B: BE8 images only valid in big-endian mode."),
791 globals
->byteswap_code
= byteswap_code
;
793 /* Rummage around all the relocs and map the glue vectors. */
794 sec
= abfd
->sections
;
799 for (; sec
!= NULL
; sec
= sec
->next
)
801 if (sec
->reloc_count
== 0)
804 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
806 /* Load the relocs. */
808 = _bfd_elf_link_read_relocs (abfd
, sec
, (void *) NULL
,
809 (Elf_Internal_Rela
*) NULL
, FALSE
);
811 if (internal_relocs
== NULL
)
814 irelend
= internal_relocs
+ sec
->reloc_count
;
815 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
818 unsigned long r_index
;
820 struct elf_link_hash_entry
*h
;
822 r_type
= ELF32_R_TYPE (irel
->r_info
);
823 r_index
= ELF32_R_SYM (irel
->r_info
);
825 /* These are the only relocation types we care about. */
826 if ( r_type
!= R_ARM_PC24
827 && r_type
!= R_ARM_THM_PC22
)
830 /* Get the section contents if we haven't done so already. */
831 if (contents
== NULL
)
833 /* Get cached copy if it exists. */
834 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
835 contents
= elf_section_data (sec
)->this_hdr
.contents
;
838 /* Go get them off disk. */
839 if (! bfd_malloc_and_get_section (abfd
, sec
, &contents
))
844 /* If the relocation is not against a symbol it cannot concern us. */
847 /* We don't care about local symbols. */
848 if (r_index
< symtab_hdr
->sh_info
)
851 /* This is an external symbol. */
852 r_index
-= symtab_hdr
->sh_info
;
853 h
= (struct elf_link_hash_entry
*)
854 elf_sym_hashes (abfd
)[r_index
];
856 /* If the relocation is against a static symbol it must be within
857 the current section and so cannot be a cross ARM/Thumb relocation. */
864 /* This one is a call from arm code. We need to look up
865 the target of the call. If it is a thumb target, we
867 if (ELF_ST_TYPE(h
->type
) == STT_ARM_TFUNC
)
868 record_arm_to_thumb_glue (link_info
, h
);
872 /* This one is a call from thumb code. We look
873 up the target of the call. If it is not a thumb
874 target, we insert glue. */
875 if (ELF_ST_TYPE (h
->type
) != STT_ARM_TFUNC
)
876 record_thumb_to_arm_glue (link_info
, h
);
885 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
889 if (internal_relocs
!= NULL
890 && elf_section_data (sec
)->relocs
!= internal_relocs
)
891 free (internal_relocs
);
892 internal_relocs
= NULL
;
899 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
901 if (internal_relocs
!= NULL
902 && elf_section_data (sec
)->relocs
!= internal_relocs
)
903 free (internal_relocs
);
909 /* The thumb form of a long branch is a bit finicky, because the offset
910 encoding is split over two fields, each in it's own instruction. They
911 can occur in any order. So given a thumb form of long branch, and an
912 offset, insert the offset into the thumb branch and return finished
915 It takes two thumb instructions to encode the target address. Each has
916 11 bits to invest. The upper 11 bits are stored in one (identified by
917 H-0.. see below), the lower 11 bits are stored in the other (identified
920 Combine together and shifted left by 1 (it's a half word address) and
924 H-0, upper address-0 = 000
926 H-1, lower address-0 = 800
928 They can be ordered either way, but the arm tools I've seen always put
929 the lower one first. It probably doesn't matter. krk@cygnus.com
931 XXX: Actually the order does matter. The second instruction (H-1)
932 moves the computed address into the PC, so it must be the second one
933 in the sequence. The problem, however is that whilst little endian code
934 stores the instructions in HI then LOW order, big endian code does the
935 reverse. nickc@cygnus.com. */
937 #define LOW_HI_ORDER 0xF800F000
938 #define HI_LOW_ORDER 0xF000F800
941 insert_thumb_branch (insn32 br_insn
, int rel_off
)
943 unsigned int low_bits
;
944 unsigned int high_bits
;
946 BFD_ASSERT ((rel_off
& 1) != 1);
948 rel_off
>>= 1; /* Half word aligned address. */
949 low_bits
= rel_off
& 0x000007FF; /* The bottom 11 bits. */
950 high_bits
= (rel_off
>> 11) & 0x000007FF; /* The top 11 bits. */
952 if ((br_insn
& LOW_HI_ORDER
) == LOW_HI_ORDER
)
953 br_insn
= LOW_HI_ORDER
| (low_bits
<< 16) | high_bits
;
954 else if ((br_insn
& HI_LOW_ORDER
) == HI_LOW_ORDER
)
955 br_insn
= HI_LOW_ORDER
| (high_bits
<< 16) | low_bits
;
957 /* FIXME: abort is probably not the right call. krk@cygnus.com */
958 abort (); /* Error - not a valid branch instruction form. */
963 /* Thumb code calling an ARM function. */
966 elf32_thumb_to_arm_stub (struct bfd_link_info
* info
,
970 asection
* input_section
,
974 bfd_signed_vma addend
,
979 unsigned long int tmp
;
981 struct elf_link_hash_entry
* myh
;
982 struct elf32_arm_link_hash_table
* globals
;
984 myh
= find_thumb_glue (info
, name
, input_bfd
);
988 globals
= elf32_arm_hash_table (info
);
990 BFD_ASSERT (globals
!= NULL
);
991 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
993 my_offset
= myh
->root
.u
.def
.value
;
995 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
996 THUMB2ARM_GLUE_SECTION_NAME
);
998 BFD_ASSERT (s
!= NULL
);
999 BFD_ASSERT (s
->contents
!= NULL
);
1000 BFD_ASSERT (s
->output_section
!= NULL
);
1002 if ((my_offset
& 0x01) == 0x01)
1005 && sym_sec
->owner
!= NULL
1006 && !INTERWORK_FLAG (sym_sec
->owner
))
1008 (*_bfd_error_handler
)
1009 (_("%B(%s): warning: interworking not enabled.\n"
1010 " first occurrence: %B: thumb call to arm"),
1011 sym_sec
->owner
, input_bfd
, name
);
1017 myh
->root
.u
.def
.value
= my_offset
;
1019 bfd_put_16 (output_bfd
, (bfd_vma
) t2a1_bx_pc_insn
,
1020 s
->contents
+ my_offset
);
1022 bfd_put_16 (output_bfd
, (bfd_vma
) t2a2_noop_insn
,
1023 s
->contents
+ my_offset
+ 2);
1026 /* Address of destination of the stub. */
1027 ((bfd_signed_vma
) val
)
1029 /* Offset from the start of the current section
1030 to the start of the stubs. */
1032 /* Offset of the start of this stub from the start of the stubs. */
1034 /* Address of the start of the current section. */
1035 + s
->output_section
->vma
)
1036 /* The branch instruction is 4 bytes into the stub. */
1038 /* ARM branches work from the pc of the instruction + 8. */
1041 bfd_put_32 (output_bfd
,
1042 (bfd_vma
) t2a3_b_insn
| ((ret_offset
>> 2) & 0x00FFFFFF),
1043 s
->contents
+ my_offset
+ 4);
1046 BFD_ASSERT (my_offset
<= globals
->thumb_glue_size
);
1048 /* Now go back and fix up the original BL insn to point to here. */
1050 /* Address of where the stub is located. */
1051 (s
->output_section
->vma
+ s
->output_offset
+ my_offset
)
1052 /* Address of where the BL is located. */
1053 - (input_section
->output_section
->vma
+ input_section
->output_offset
1055 /* Addend in the relocation. */
1057 /* Biassing for PC-relative addressing. */
1060 tmp
= bfd_get_32 (input_bfd
, hit_data
1061 - input_section
->vma
);
1063 bfd_put_32 (output_bfd
,
1064 (bfd_vma
) insert_thumb_branch (tmp
, ret_offset
),
1065 hit_data
- input_section
->vma
);
1070 /* Arm code calling a Thumb function. */
1073 elf32_arm_to_thumb_stub (struct bfd_link_info
* info
,
1077 asection
* input_section
,
1078 bfd_byte
* hit_data
,
1081 bfd_signed_vma addend
,
1084 unsigned long int tmp
;
1087 long int ret_offset
;
1088 struct elf_link_hash_entry
* myh
;
1089 struct elf32_arm_link_hash_table
* globals
;
1091 myh
= find_arm_glue (info
, name
, input_bfd
);
1095 globals
= elf32_arm_hash_table (info
);
1097 BFD_ASSERT (globals
!= NULL
);
1098 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
1100 my_offset
= myh
->root
.u
.def
.value
;
1101 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
1102 ARM2THUMB_GLUE_SECTION_NAME
);
1103 BFD_ASSERT (s
!= NULL
);
1104 BFD_ASSERT (s
->contents
!= NULL
);
1105 BFD_ASSERT (s
->output_section
!= NULL
);
1107 if ((my_offset
& 0x01) == 0x01)
1110 && sym_sec
->owner
!= NULL
1111 && !INTERWORK_FLAG (sym_sec
->owner
))
1113 (*_bfd_error_handler
)
1114 (_("%B(%s): warning: interworking not enabled.\n"
1115 " first occurrence: %B: arm call to thumb"),
1116 sym_sec
->owner
, input_bfd
, name
);
1120 myh
->root
.u
.def
.value
= my_offset
;
1122 bfd_put_32 (output_bfd
, (bfd_vma
) a2t1_ldr_insn
,
1123 s
->contents
+ my_offset
);
1125 bfd_put_32 (output_bfd
, (bfd_vma
) a2t2_bx_r12_insn
,
1126 s
->contents
+ my_offset
+ 4);
1128 /* It's a thumb address. Add the low order bit. */
1129 bfd_put_32 (output_bfd
, val
| a2t3_func_addr_insn
,
1130 s
->contents
+ my_offset
+ 8);
1133 BFD_ASSERT (my_offset
<= globals
->arm_glue_size
);
1135 tmp
= bfd_get_32 (input_bfd
, hit_data
);
1136 tmp
= tmp
& 0xFF000000;
1138 /* Somehow these are both 4 too far, so subtract 8. */
1139 ret_offset
= (s
->output_offset
1141 + s
->output_section
->vma
1142 - (input_section
->output_offset
1143 + input_section
->output_section
->vma
1147 tmp
= tmp
| ((ret_offset
>> 2) & 0x00FFFFFF);
1149 bfd_put_32 (output_bfd
, (bfd_vma
) tmp
, hit_data
- input_section
->vma
);
1154 /* Perform a relocation as part of a final link. */
1156 static bfd_reloc_status_type
1157 elf32_arm_final_link_relocate (reloc_howto_type
* howto
,
1160 asection
* input_section
,
1161 bfd_byte
* contents
,
1162 Elf_Internal_Rela
* rel
,
1164 struct bfd_link_info
* info
,
1166 const char * sym_name
,
1168 struct elf_link_hash_entry
* h
)
1170 unsigned long r_type
= howto
->type
;
1171 unsigned long r_symndx
;
1172 bfd_byte
* hit_data
= contents
+ rel
->r_offset
;
1173 bfd
* dynobj
= NULL
;
1174 Elf_Internal_Shdr
* symtab_hdr
;
1175 struct elf_link_hash_entry
** sym_hashes
;
1176 bfd_vma
* local_got_offsets
;
1177 asection
* sgot
= NULL
;
1178 asection
* splt
= NULL
;
1179 asection
* sreloc
= NULL
;
1181 bfd_signed_vma signed_addend
;
1182 struct elf32_arm_link_hash_table
* globals
;
1184 globals
= elf32_arm_hash_table (info
);
1187 /* Some relocation type map to different relocations depending on the
1188 target. We pick the right one here. */
1189 if (r_type
== R_ARM_TARGET1
)
1191 if (globals
->target1_is_rel
)
1192 r_type
= R_ARM_REL32
;
1194 r_type
= R_ARM_ABS32
;
1196 howto
= &elf32_arm_howto_table
[r_type
];
1198 #endif /* OLD_ARM_ABI */
1200 /* If the start address has been set, then set the EF_ARM_HASENTRY
1201 flag. Setting this more than once is redundant, but the cost is
1202 not too high, and it keeps the code simple.
1204 The test is done here, rather than somewhere else, because the
1205 start address is only set just before the final link commences.
1207 Note - if the user deliberately sets a start address of 0, the
1208 flag will not be set. */
1209 if (bfd_get_start_address (output_bfd
) != 0)
1210 elf_elfheader (output_bfd
)->e_flags
|= EF_ARM_HASENTRY
;
1212 dynobj
= elf_hash_table (info
)->dynobj
;
1215 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1216 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1218 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1219 sym_hashes
= elf_sym_hashes (input_bfd
);
1220 local_got_offsets
= elf_local_got_offsets (input_bfd
);
1221 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1224 addend
= bfd_get_32 (input_bfd
, hit_data
) & howto
->src_mask
;
1226 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1229 signed_addend
&= ~ howto
->src_mask
;
1230 signed_addend
|= addend
;
1233 signed_addend
= addend
;
1235 addend
= signed_addend
= rel
->r_addend
;
1241 return bfd_reloc_ok
;
1250 /* r_symndx will be zero only for relocs against symbols
1251 from removed linkonce sections, or sections discarded by
1254 return bfd_reloc_ok
;
1256 /* Handle relocations which should use the PLT entry. ABS32/REL32
1257 will use the symbol's value, which may point to a PLT entry, but we
1258 don't need to handle that here. If we created a PLT entry, all
1259 branches in this object should go to it. */
1260 if ((r_type
!= R_ARM_ABS32
&& r_type
!= R_ARM_REL32
)
1263 && h
->plt
.offset
!= (bfd_vma
) -1)
1265 /* If we've created a .plt section, and assigned a PLT entry to
1266 this function, it should not be known to bind locally. If
1267 it were, we would have cleared the PLT entry. */
1268 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info
, h
));
1270 value
= (splt
->output_section
->vma
1271 + splt
->output_offset
1273 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1274 contents
, rel
->r_offset
, value
,
1278 /* When generating a shared object, these relocations are copied
1279 into the output file to be resolved at run time. */
1281 && (input_section
->flags
& SEC_ALLOC
)
1282 && (r_type
!= R_ARM_REL32
1283 || !SYMBOL_CALLS_LOCAL (info
, h
))
1285 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1286 || h
->root
.type
!= bfd_link_hash_undefweak
)
1287 && r_type
!= R_ARM_PC24
1288 && r_type
!= R_ARM_PLT32
)
1290 Elf_Internal_Rela outrel
;
1292 bfd_boolean skip
, relocate
;
1298 name
= (bfd_elf_string_from_elf_section
1300 elf_elfheader (input_bfd
)->e_shstrndx
,
1301 elf_section_data (input_section
)->rel_hdr
.sh_name
));
1303 return bfd_reloc_notsupported
;
1305 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
1306 && strcmp (bfd_get_section_name (input_bfd
,
1310 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1311 BFD_ASSERT (sreloc
!= NULL
);
1318 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
1320 if (outrel
.r_offset
== (bfd_vma
) -1)
1322 else if (outrel
.r_offset
== (bfd_vma
) -2)
1323 skip
= TRUE
, relocate
= TRUE
;
1324 outrel
.r_offset
+= (input_section
->output_section
->vma
1325 + input_section
->output_offset
);
1328 memset (&outrel
, 0, sizeof outrel
);
1333 || (h
->elf_link_hash_flags
1334 & ELF_LINK_HASH_DEF_REGULAR
) == 0))
1335 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
1338 /* This symbol is local, or marked to become local. */
1340 outrel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
1343 loc
= sreloc
->contents
;
1344 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
1345 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
1347 /* If this reloc is against an external symbol, we do not want to
1348 fiddle with the addend. Otherwise, we need to include the symbol
1349 value so that it becomes an addend for the dynamic reloc. */
1351 return bfd_reloc_ok
;
1353 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1354 contents
, rel
->r_offset
, value
,
1357 else switch (r_type
)
1360 case R_ARM_XPC25
: /* Arm BLX instruction. */
1362 case R_ARM_PC24
: /* Arm B/BL instruction */
1365 if (r_type
== R_ARM_XPC25
)
1367 /* Check for Arm calling Arm function. */
1368 /* FIXME: Should we translate the instruction into a BL
1369 instruction instead ? */
1370 if (sym_flags
!= STT_ARM_TFUNC
)
1371 (*_bfd_error_handler
)
1372 (_("\%B: Warning: Arm BLX instruction targets Arm function '%s'."),
1374 h
? h
->root
.root
.string
: "(local)");
1379 /* Check for Arm calling Thumb function. */
1380 if (sym_flags
== STT_ARM_TFUNC
)
1382 elf32_arm_to_thumb_stub (info
, sym_name
, input_bfd
,
1383 output_bfd
, input_section
,
1384 hit_data
, sym_sec
, rel
->r_offset
,
1385 signed_addend
, value
);
1386 return bfd_reloc_ok
;
1390 if ( strcmp (bfd_get_target (input_bfd
), "elf32-littlearm-oabi") == 0
1391 || strcmp (bfd_get_target (input_bfd
), "elf32-bigarm-oabi") == 0)
1393 /* The old way of doing things. Trearing the addend as a
1394 byte sized field and adding in the pipeline offset. */
1395 value
-= (input_section
->output_section
->vma
1396 + input_section
->output_offset
);
1397 value
-= rel
->r_offset
;
1400 if (! globals
->no_pipeline_knowledge
)
1405 /* The ARM ELF ABI says that this reloc is computed as: S - P + A
1407 S is the address of the symbol in the relocation.
1408 P is address of the instruction being relocated.
1409 A is the addend (extracted from the instruction) in bytes.
1411 S is held in 'value'.
1412 P is the base address of the section containing the
1413 instruction plus the offset of the reloc into that
1415 (input_section->output_section->vma +
1416 input_section->output_offset +
1418 A is the addend, converted into bytes, ie:
1421 Note: None of these operations have knowledge of the pipeline
1422 size of the processor, thus it is up to the assembler to
1423 encode this information into the addend. */
1424 value
-= (input_section
->output_section
->vma
1425 + input_section
->output_offset
);
1426 value
-= rel
->r_offset
;
1427 value
+= (signed_addend
<< howto
->size
);
1429 /* Previous versions of this code also used to add in the
1430 pipeline offset here. This is wrong because the linker is
1431 not supposed to know about such things, and one day it might
1432 change. In order to support old binaries that need the old
1433 behaviour however, so we attempt to detect which ABI was
1434 used to create the reloc. */
1435 if (! globals
->no_pipeline_knowledge
)
1437 Elf_Internal_Ehdr
* i_ehdrp
; /* Elf file header, internal form */
1439 i_ehdrp
= elf_elfheader (input_bfd
);
1441 if (i_ehdrp
->e_ident
[EI_OSABI
] == 0)
1446 signed_addend
= value
;
1447 signed_addend
>>= howto
->rightshift
;
1449 /* It is not an error for an undefined weak reference to be
1450 out of range. Any program that branches to such a symbol
1451 is going to crash anyway, so there is no point worrying
1452 about getting the destination exactly right. */
1453 if (! h
|| h
->root
.type
!= bfd_link_hash_undefweak
)
1455 /* Perform a signed range check. */
1456 if ( signed_addend
> ((bfd_signed_vma
) (howto
->dst_mask
>> 1))
1457 || signed_addend
< - ((bfd_signed_vma
) ((howto
->dst_mask
+ 1) >> 1)))
1458 return bfd_reloc_overflow
;
1462 /* If necessary set the H bit in the BLX instruction. */
1463 if (r_type
== R_ARM_XPC25
&& ((value
& 2) == 2))
1464 value
= (signed_addend
& howto
->dst_mask
)
1465 | (bfd_get_32 (input_bfd
, hit_data
) & (~ howto
->dst_mask
))
1469 value
= (signed_addend
& howto
->dst_mask
)
1470 | (bfd_get_32 (input_bfd
, hit_data
) & (~ howto
->dst_mask
));
1475 if (sym_flags
== STT_ARM_TFUNC
)
1480 value
-= (input_section
->output_section
->vma
1481 + input_section
->output_offset
+ rel
->r_offset
);
1486 bfd_put_32 (input_bfd
, value
, hit_data
);
1487 return bfd_reloc_ok
;
1491 if ((long) value
> 0x7f || (long) value
< -0x80)
1492 return bfd_reloc_overflow
;
1494 bfd_put_8 (input_bfd
, value
, hit_data
);
1495 return bfd_reloc_ok
;
1500 if ((long) value
> 0x7fff || (long) value
< -0x8000)
1501 return bfd_reloc_overflow
;
1503 bfd_put_16 (input_bfd
, value
, hit_data
);
1504 return bfd_reloc_ok
;
1507 /* Support ldr and str instruction for the arm */
1508 /* Also thumb b (unconditional branch). ??? Really? */
1511 if ((long) value
> 0x7ff || (long) value
< -0x800)
1512 return bfd_reloc_overflow
;
1514 value
|= (bfd_get_32 (input_bfd
, hit_data
) & 0xfffff000);
1515 bfd_put_32 (input_bfd
, value
, hit_data
);
1516 return bfd_reloc_ok
;
1518 case R_ARM_THM_ABS5
:
1519 /* Support ldr and str instructions for the thumb. */
1521 /* Need to refetch addend. */
1522 addend
= bfd_get_16 (input_bfd
, hit_data
) & howto
->src_mask
;
1523 /* ??? Need to determine shift amount from operand size. */
1524 addend
>>= howto
->rightshift
;
1528 /* ??? Isn't value unsigned? */
1529 if ((long) value
> 0x1f || (long) value
< -0x10)
1530 return bfd_reloc_overflow
;
1532 /* ??? Value needs to be properly shifted into place first. */
1533 value
|= bfd_get_16 (input_bfd
, hit_data
) & 0xf83f;
1534 bfd_put_16 (input_bfd
, value
, hit_data
);
1535 return bfd_reloc_ok
;
1538 case R_ARM_THM_XPC22
:
1540 case R_ARM_THM_PC22
:
1541 /* Thumb BL (branch long instruction). */
1544 bfd_boolean overflow
= FALSE
;
1545 bfd_vma upper_insn
= bfd_get_16 (input_bfd
, hit_data
);
1546 bfd_vma lower_insn
= bfd_get_16 (input_bfd
, hit_data
+ 2);
1547 bfd_signed_vma reloc_signed_max
= ((1 << (howto
->bitsize
- 1)) - 1) >> howto
->rightshift
;
1548 bfd_signed_vma reloc_signed_min
= ~ reloc_signed_max
;
1550 bfd_signed_vma signed_check
;
1553 /* Need to refetch the addend and squish the two 11 bit pieces
1556 bfd_vma upper
= upper_insn
& 0x7ff;
1557 bfd_vma lower
= lower_insn
& 0x7ff;
1558 upper
= (upper
^ 0x400) - 0x400; /* Sign extend. */
1559 addend
= (upper
<< 12) | (lower
<< 1);
1560 signed_addend
= addend
;
1564 if (r_type
== R_ARM_THM_XPC22
)
1566 /* Check for Thumb to Thumb call. */
1567 /* FIXME: Should we translate the instruction into a BL
1568 instruction instead ? */
1569 if (sym_flags
== STT_ARM_TFUNC
)
1570 (*_bfd_error_handler
)
1571 (_("%B: Warning: Thumb BLX instruction targets thumb function '%s'."),
1573 h
? h
->root
.root
.string
: "(local)");
1578 /* If it is not a call to Thumb, assume call to Arm.
1579 If it is a call relative to a section name, then it is not a
1580 function call at all, but rather a long jump. */
1581 if (sym_flags
!= STT_ARM_TFUNC
&& sym_flags
!= STT_SECTION
)
1583 if (elf32_thumb_to_arm_stub
1584 (info
, sym_name
, input_bfd
, output_bfd
, input_section
,
1585 hit_data
, sym_sec
, rel
->r_offset
, signed_addend
, value
))
1586 return bfd_reloc_ok
;
1588 return bfd_reloc_dangerous
;
1592 relocation
= value
+ signed_addend
;
1594 relocation
-= (input_section
->output_section
->vma
1595 + input_section
->output_offset
1598 if (! globals
->no_pipeline_knowledge
)
1600 Elf_Internal_Ehdr
* i_ehdrp
; /* Elf file header, internal form. */
1602 i_ehdrp
= elf_elfheader (input_bfd
);
1604 /* Previous versions of this code also used to add in the pipline
1605 offset here. This is wrong because the linker is not supposed
1606 to know about such things, and one day it might change. In order
1607 to support old binaries that need the old behaviour however, so
1608 we attempt to detect which ABI was used to create the reloc. */
1609 if ( strcmp (bfd_get_target (input_bfd
), "elf32-littlearm-oabi") == 0
1610 || strcmp (bfd_get_target (input_bfd
), "elf32-bigarm-oabi") == 0
1611 || i_ehdrp
->e_ident
[EI_OSABI
] == 0)
1615 check
= relocation
>> howto
->rightshift
;
1617 /* If this is a signed value, the rightshift just dropped
1618 leading 1 bits (assuming twos complement). */
1619 if ((bfd_signed_vma
) relocation
>= 0)
1620 signed_check
= check
;
1622 signed_check
= check
| ~((bfd_vma
) -1 >> howto
->rightshift
);
1624 /* Assumes two's complement. */
1625 if (signed_check
> reloc_signed_max
|| signed_check
< reloc_signed_min
)
1629 if (r_type
== R_ARM_THM_XPC22
1630 && ((lower_insn
& 0x1800) == 0x0800))
1631 /* For a BLX instruction, make sure that the relocation is rounded up
1632 to a word boundary. This follows the semantics of the instruction
1633 which specifies that bit 1 of the target address will come from bit
1634 1 of the base address. */
1635 relocation
= (relocation
+ 2) & ~ 3;
1637 /* Put RELOCATION back into the insn. */
1638 upper_insn
= (upper_insn
& ~(bfd_vma
) 0x7ff) | ((relocation
>> 12) & 0x7ff);
1639 lower_insn
= (lower_insn
& ~(bfd_vma
) 0x7ff) | ((relocation
>> 1) & 0x7ff);
1641 /* Put the relocated value back in the object file: */
1642 bfd_put_16 (input_bfd
, upper_insn
, hit_data
);
1643 bfd_put_16 (input_bfd
, lower_insn
, hit_data
+ 2);
1645 return (overflow
? bfd_reloc_overflow
: bfd_reloc_ok
);
1649 case R_ARM_THM_PC11
:
1650 /* Thumb B (branch) instruction). */
1652 bfd_signed_vma relocation
;
1653 bfd_signed_vma reloc_signed_max
= (1 << (howto
->bitsize
- 1)) - 1;
1654 bfd_signed_vma reloc_signed_min
= ~ reloc_signed_max
;
1655 bfd_signed_vma signed_check
;
1658 /* Need to refetch addend. */
1659 addend
= bfd_get_16 (input_bfd
, hit_data
) & howto
->src_mask
;
1660 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1663 signed_addend
&= ~ howto
->src_mask
;
1664 signed_addend
|= addend
;
1667 signed_addend
= addend
;
1668 /* The value in the insn has been right shifted. We need to
1669 undo this, so that we can perform the address calculation
1670 in terms of bytes. */
1671 signed_addend
<<= howto
->rightshift
;
1673 relocation
= value
+ signed_addend
;
1675 relocation
-= (input_section
->output_section
->vma
1676 + input_section
->output_offset
1679 relocation
>>= howto
->rightshift
;
1680 signed_check
= relocation
;
1681 relocation
&= howto
->dst_mask
;
1682 relocation
|= (bfd_get_16 (input_bfd
, hit_data
) & (~ howto
->dst_mask
));
1684 bfd_put_16 (input_bfd
, relocation
, hit_data
);
1686 /* Assumes two's complement. */
1687 if (signed_check
> reloc_signed_max
|| signed_check
< reloc_signed_min
)
1688 return bfd_reloc_overflow
;
1690 return bfd_reloc_ok
;
1694 case R_ARM_ALU_PCREL7_0
:
1695 case R_ARM_ALU_PCREL15_8
:
1696 case R_ARM_ALU_PCREL23_15
:
1701 insn
= bfd_get_32 (input_bfd
, hit_data
);
1703 /* Extract the addend. */
1704 addend
= (insn
& 0xff) << ((insn
& 0xf00) >> 7);
1705 signed_addend
= addend
;
1707 relocation
= value
+ signed_addend
;
1709 relocation
-= (input_section
->output_section
->vma
1710 + input_section
->output_offset
1712 insn
= (insn
& ~0xfff)
1713 | ((howto
->bitpos
<< 7) & 0xf00)
1714 | ((relocation
>> howto
->bitpos
) & 0xff);
1715 bfd_put_32 (input_bfd
, value
, hit_data
);
1717 return bfd_reloc_ok
;
1720 case R_ARM_GNU_VTINHERIT
:
1721 case R_ARM_GNU_VTENTRY
:
1722 return bfd_reloc_ok
;
1725 return bfd_reloc_notsupported
;
1727 case R_ARM_GLOB_DAT
:
1728 return bfd_reloc_notsupported
;
1730 case R_ARM_JUMP_SLOT
:
1731 return bfd_reloc_notsupported
;
1733 case R_ARM_RELATIVE
:
1734 return bfd_reloc_notsupported
;
1737 /* Relocation is relative to the start of the
1738 global offset table. */
1740 BFD_ASSERT (sgot
!= NULL
);
1742 return bfd_reloc_notsupported
;
1744 /* If we are addressing a Thumb function, we need to adjust the
1745 address by one, so that attempts to call the function pointer will
1746 correctly interpret it as Thumb code. */
1747 if (sym_flags
== STT_ARM_TFUNC
)
1750 /* Note that sgot->output_offset is not involved in this
1751 calculation. We always want the start of .got. If we
1752 define _GLOBAL_OFFSET_TABLE in a different way, as is
1753 permitted by the ABI, we might have to change this
1755 value
-= sgot
->output_section
->vma
;
1756 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1757 contents
, rel
->r_offset
, value
,
1761 /* Use global offset table as symbol value. */
1762 BFD_ASSERT (sgot
!= NULL
);
1765 return bfd_reloc_notsupported
;
1767 value
= sgot
->output_section
->vma
;
1768 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1769 contents
, rel
->r_offset
, value
,
1773 /* Relocation is to the entry for this symbol in the
1774 global offset table. */
1776 return bfd_reloc_notsupported
;
1783 off
= h
->got
.offset
;
1784 BFD_ASSERT (off
!= (bfd_vma
) -1);
1785 dyn
= globals
->root
.dynamic_sections_created
;
1787 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
1789 && SYMBOL_REFERENCES_LOCAL (info
, h
))
1790 || (ELF_ST_VISIBILITY (h
->other
)
1791 && h
->root
.type
== bfd_link_hash_undefweak
))
1793 /* This is actually a static link, or it is a -Bsymbolic link
1794 and the symbol is defined locally. We must initialize this
1795 entry in the global offset table. Since the offset must
1796 always be a multiple of 4, we use the least significant bit
1797 to record whether we have initialized it already.
1799 When doing a dynamic link, we create a .rel.got relocation
1800 entry to initialize the value. This is done in the
1801 finish_dynamic_symbol routine. */
1806 /* If we are addressing a Thumb function, we need to
1807 adjust the address by one, so that attempts to
1808 call the function pointer will correctly
1809 interpret it as Thumb code. */
1810 if (sym_flags
== STT_ARM_TFUNC
)
1813 bfd_put_32 (output_bfd
, value
, sgot
->contents
+ off
);
1818 value
= sgot
->output_offset
+ off
;
1824 BFD_ASSERT (local_got_offsets
!= NULL
&&
1825 local_got_offsets
[r_symndx
] != (bfd_vma
) -1);
1827 off
= local_got_offsets
[r_symndx
];
1829 /* The offset must always be a multiple of 4. We use the
1830 least significant bit to record whether we have already
1831 generated the necessary reloc. */
1836 bfd_put_32 (output_bfd
, value
, sgot
->contents
+ off
);
1841 Elf_Internal_Rela outrel
;
1844 srelgot
= bfd_get_section_by_name (dynobj
, ".rel.got");
1845 BFD_ASSERT (srelgot
!= NULL
);
1847 outrel
.r_offset
= (sgot
->output_section
->vma
1848 + sgot
->output_offset
1850 outrel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
1851 loc
= srelgot
->contents
;
1852 loc
+= srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
1853 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
1856 local_got_offsets
[r_symndx
] |= 1;
1859 value
= sgot
->output_offset
+ off
;
1862 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1863 contents
, rel
->r_offset
, value
,
1867 return bfd_reloc_notsupported
;
1869 case R_ARM_AMP_VCALL9
:
1870 return bfd_reloc_notsupported
;
1872 case R_ARM_RSBREL32
:
1873 return bfd_reloc_notsupported
;
1875 case R_ARM_THM_RPC22
:
1876 return bfd_reloc_notsupported
;
1879 return bfd_reloc_notsupported
;
1882 return bfd_reloc_notsupported
;
1885 return bfd_reloc_notsupported
;
1888 return bfd_reloc_notsupported
;
1891 return bfd_reloc_notsupported
;
1896 /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */
1898 arm_add_to_rel (bfd
* abfd
,
1900 reloc_howto_type
* howto
,
1901 bfd_signed_vma increment
)
1903 bfd_signed_vma addend
;
1905 if (howto
->type
== R_ARM_THM_PC22
)
1907 int upper_insn
, lower_insn
;
1910 upper_insn
= bfd_get_16 (abfd
, address
);
1911 lower_insn
= bfd_get_16 (abfd
, address
+ 2);
1912 upper
= upper_insn
& 0x7ff;
1913 lower
= lower_insn
& 0x7ff;
1915 addend
= (upper
<< 12) | (lower
<< 1);
1916 addend
+= increment
;
1919 upper_insn
= (upper_insn
& 0xf800) | ((addend
>> 11) & 0x7ff);
1920 lower_insn
= (lower_insn
& 0xf800) | (addend
& 0x7ff);
1922 bfd_put_16 (abfd
, (bfd_vma
) upper_insn
, address
);
1923 bfd_put_16 (abfd
, (bfd_vma
) lower_insn
, address
+ 2);
1929 contents
= bfd_get_32 (abfd
, address
);
1931 /* Get the (signed) value from the instruction. */
1932 addend
= contents
& howto
->src_mask
;
1933 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1935 bfd_signed_vma mask
;
1938 mask
&= ~ howto
->src_mask
;
1942 /* Add in the increment, (which is a byte value). */
1943 switch (howto
->type
)
1946 addend
+= increment
;
1950 addend
<<= howto
->size
;
1951 addend
+= increment
;
1953 /* Should we check for overflow here ? */
1955 /* Drop any undesired bits. */
1956 addend
>>= howto
->rightshift
;
1960 contents
= (contents
& ~ howto
->dst_mask
) | (addend
& howto
->dst_mask
);
1962 bfd_put_32 (abfd
, contents
, address
);
1965 #endif /* USE_REL */
1967 /* Relocate an ARM ELF section. */
1969 elf32_arm_relocate_section (bfd
* output_bfd
,
1970 struct bfd_link_info
* info
,
1972 asection
* input_section
,
1973 bfd_byte
* contents
,
1974 Elf_Internal_Rela
* relocs
,
1975 Elf_Internal_Sym
* local_syms
,
1976 asection
** local_sections
)
1978 Elf_Internal_Shdr
*symtab_hdr
;
1979 struct elf_link_hash_entry
**sym_hashes
;
1980 Elf_Internal_Rela
*rel
;
1981 Elf_Internal_Rela
*relend
;
1985 if (info
->relocatable
)
1989 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1990 sym_hashes
= elf_sym_hashes (input_bfd
);
1993 relend
= relocs
+ input_section
->reloc_count
;
1994 for (; rel
< relend
; rel
++)
1997 reloc_howto_type
* howto
;
1998 unsigned long r_symndx
;
1999 Elf_Internal_Sym
* sym
;
2001 struct elf_link_hash_entry
* h
;
2003 bfd_reloc_status_type r
;
2006 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2007 r_type
= ELF32_R_TYPE (rel
->r_info
);
2009 if ( r_type
== R_ARM_GNU_VTENTRY
2010 || r_type
== R_ARM_GNU_VTINHERIT
)
2013 elf32_arm_info_to_howto (input_bfd
, & bfd_reloc
, rel
);
2014 howto
= bfd_reloc
.howto
;
2017 if (info
->relocatable
)
2019 /* This is a relocatable link. We don't have to change
2020 anything, unless the reloc is against a section symbol,
2021 in which case we have to adjust according to where the
2022 section symbol winds up in the output section. */
2023 if (r_symndx
< symtab_hdr
->sh_info
)
2025 sym
= local_syms
+ r_symndx
;
2026 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2028 sec
= local_sections
[r_symndx
];
2029 arm_add_to_rel (input_bfd
, contents
+ rel
->r_offset
,
2031 (bfd_signed_vma
) (sec
->output_offset
2040 /* This is a final link. */
2045 if (r_symndx
< symtab_hdr
->sh_info
)
2047 sym
= local_syms
+ r_symndx
;
2048 sec
= local_sections
[r_symndx
];
2050 relocation
= (sec
->output_section
->vma
2051 + sec
->output_offset
2053 if ((sec
->flags
& SEC_MERGE
)
2054 && ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2057 bfd_vma addend
, value
;
2059 if (howto
->rightshift
)
2061 (*_bfd_error_handler
)
2062 (_("%B(%A+0x%lx): %s relocation against SEC_MERGE section"),
2063 input_bfd
, input_section
,
2064 (long) rel
->r_offset
, howto
->name
);
2068 value
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2070 /* Get the (signed) value from the instruction. */
2071 addend
= value
& howto
->src_mask
;
2072 if (addend
& ((howto
->src_mask
+ 1) >> 1))
2074 bfd_signed_vma mask
;
2077 mask
&= ~ howto
->src_mask
;
2082 _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
, addend
)
2084 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
2085 value
= (value
& ~ howto
->dst_mask
) | (addend
& howto
->dst_mask
);
2086 bfd_put_32 (input_bfd
, value
, contents
+ rel
->r_offset
);
2089 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2095 bfd_boolean unresolved_reloc
;
2097 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2098 r_symndx
, symtab_hdr
, sym_hashes
,
2100 unresolved_reloc
, warned
);
2102 if (unresolved_reloc
|| relocation
!= 0)
2104 /* In these cases, we don't need the relocation value.
2105 We check specially because in some obscure cases
2106 sec->output_section will be NULL. */
2111 case R_ARM_THM_PC22
:
2116 (!info
->symbolic
&& h
->dynindx
!= -1)
2117 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2119 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2120 && ((input_section
->flags
& SEC_ALLOC
) != 0
2121 /* DWARF will emit R_ARM_ABS32 relocations in its
2122 sections against symbols defined externally
2123 in shared libraries. We can't do anything
2125 || ((input_section
->flags
& SEC_DEBUGGING
) != 0
2126 && (h
->elf_link_hash_flags
2127 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0))
2137 if ((WILL_CALL_FINISH_DYNAMIC_SYMBOL
2138 (elf_hash_table (info
)->dynamic_sections_created
,
2141 || (!info
->symbolic
&& h
->dynindx
!= -1)
2142 || (h
->elf_link_hash_flags
2143 & ELF_LINK_HASH_DEF_REGULAR
) == 0))
2148 if (unresolved_reloc
)
2150 (_("%B(%A): warning: unresolvable relocation %d against symbol `%s'"),
2151 input_bfd
, input_section
,
2153 h
->root
.root
.string
);
2160 name
= h
->root
.root
.string
;
2163 name
= (bfd_elf_string_from_elf_section
2164 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
));
2165 if (name
== NULL
|| *name
== '\0')
2166 name
= bfd_section_name (input_bfd
, sec
);
2169 r
= elf32_arm_final_link_relocate (howto
, input_bfd
, output_bfd
,
2170 input_section
, contents
, rel
,
2171 relocation
, info
, sec
, name
,
2172 (h
? ELF_ST_TYPE (h
->type
) :
2173 ELF_ST_TYPE (sym
->st_info
)), h
);
2175 if (r
!= bfd_reloc_ok
)
2177 const char * msg
= (const char *) 0;
2181 case bfd_reloc_overflow
:
2182 /* If the overflowing reloc was to an undefined symbol,
2183 we have already printed one error message and there
2184 is no point complaining again. */
2186 h
->root
.type
!= bfd_link_hash_undefined
)
2187 && (!((*info
->callbacks
->reloc_overflow
)
2188 (info
, name
, howto
->name
, (bfd_vma
) 0,
2189 input_bfd
, input_section
, rel
->r_offset
))))
2193 case bfd_reloc_undefined
:
2194 if (!((*info
->callbacks
->undefined_symbol
)
2195 (info
, name
, input_bfd
, input_section
,
2196 rel
->r_offset
, TRUE
)))
2200 case bfd_reloc_outofrange
:
2201 msg
= _("internal error: out of range error");
2204 case bfd_reloc_notsupported
:
2205 msg
= _("internal error: unsupported relocation error");
2208 case bfd_reloc_dangerous
:
2209 msg
= _("internal error: dangerous error");
2213 msg
= _("internal error: unknown error");
2217 if (!((*info
->callbacks
->warning
)
2218 (info
, msg
, name
, input_bfd
, input_section
,
2229 /* Set the right machine number. */
2232 elf32_arm_object_p (bfd
*abfd
)
2236 mach
= bfd_arm_get_mach_from_notes (abfd
, ARM_NOTE_SECTION
);
2238 if (mach
!= bfd_mach_arm_unknown
)
2239 bfd_default_set_arch_mach (abfd
, bfd_arch_arm
, mach
);
2241 else if (elf_elfheader (abfd
)->e_flags
& EF_ARM_MAVERICK_FLOAT
)
2242 bfd_default_set_arch_mach (abfd
, bfd_arch_arm
, bfd_mach_arm_ep9312
);
2245 bfd_default_set_arch_mach (abfd
, bfd_arch_arm
, mach
);
2250 /* Function to keep ARM specific flags in the ELF header. */
2252 elf32_arm_set_private_flags (bfd
*abfd
, flagword flags
)
2254 if (elf_flags_init (abfd
)
2255 && elf_elfheader (abfd
)->e_flags
!= flags
)
2257 if (EF_ARM_EABI_VERSION (flags
) == EF_ARM_EABI_UNKNOWN
)
2259 if (flags
& EF_ARM_INTERWORK
)
2260 (*_bfd_error_handler
)
2261 (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2265 (_("Warning: Clearing the interworking flag of %B due to outside request"),
2271 elf_elfheader (abfd
)->e_flags
= flags
;
2272 elf_flags_init (abfd
) = TRUE
;
2278 /* Copy backend specific data from one object module to another. */
2281 elf32_arm_copy_private_bfd_data (bfd
*ibfd
, bfd
*obfd
)
2286 if ( bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2287 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2290 in_flags
= elf_elfheader (ibfd
)->e_flags
;
2291 out_flags
= elf_elfheader (obfd
)->e_flags
;
2293 if (elf_flags_init (obfd
)
2294 && EF_ARM_EABI_VERSION (out_flags
) == EF_ARM_EABI_UNKNOWN
2295 && in_flags
!= out_flags
)
2297 /* Cannot mix APCS26 and APCS32 code. */
2298 if ((in_flags
& EF_ARM_APCS_26
) != (out_flags
& EF_ARM_APCS_26
))
2301 /* Cannot mix float APCS and non-float APCS code. */
2302 if ((in_flags
& EF_ARM_APCS_FLOAT
) != (out_flags
& EF_ARM_APCS_FLOAT
))
2305 /* If the src and dest have different interworking flags
2306 then turn off the interworking bit. */
2307 if ((in_flags
& EF_ARM_INTERWORK
) != (out_flags
& EF_ARM_INTERWORK
))
2309 if (out_flags
& EF_ARM_INTERWORK
)
2311 (_("Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2314 in_flags
&= ~EF_ARM_INTERWORK
;
2317 /* Likewise for PIC, though don't warn for this case. */
2318 if ((in_flags
& EF_ARM_PIC
) != (out_flags
& EF_ARM_PIC
))
2319 in_flags
&= ~EF_ARM_PIC
;
2322 elf_elfheader (obfd
)->e_flags
= in_flags
;
2323 elf_flags_init (obfd
) = TRUE
;
2328 /* Merge backend specific data from an object file to the output
2329 object file when linking. */
2332 elf32_arm_merge_private_bfd_data (bfd
* ibfd
, bfd
* obfd
)
2336 bfd_boolean flags_compatible
= TRUE
;
2339 /* Check if we have the same endianess. */
2340 if (! _bfd_generic_verify_endian_match (ibfd
, obfd
))
2343 if ( bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2344 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2347 /* The input BFD must have had its flags initialised. */
2348 /* The following seems bogus to me -- The flags are initialized in
2349 the assembler but I don't think an elf_flags_init field is
2350 written into the object. */
2351 /* BFD_ASSERT (elf_flags_init (ibfd)); */
2353 in_flags
= elf_elfheader (ibfd
)->e_flags
;
2354 out_flags
= elf_elfheader (obfd
)->e_flags
;
2356 if (!elf_flags_init (obfd
))
2358 /* If the input is the default architecture and had the default
2359 flags then do not bother setting the flags for the output
2360 architecture, instead allow future merges to do this. If no
2361 future merges ever set these flags then they will retain their
2362 uninitialised values, which surprise surprise, correspond
2363 to the default values. */
2364 if (bfd_get_arch_info (ibfd
)->the_default
2365 && elf_elfheader (ibfd
)->e_flags
== 0)
2368 elf_flags_init (obfd
) = TRUE
;
2369 elf_elfheader (obfd
)->e_flags
= in_flags
;
2371 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
2372 && bfd_get_arch_info (obfd
)->the_default
)
2373 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
), bfd_get_mach (ibfd
));
2378 /* Determine what should happen if the input ARM architecture
2379 does not match the output ARM architecture. */
2380 if (! bfd_arm_merge_machines (ibfd
, obfd
))
2383 /* Identical flags must be compatible. */
2384 if (in_flags
== out_flags
)
2387 /* Check to see if the input BFD actually contains any sections. If
2388 not, its flags may not have been initialised either, but it
2389 cannot actually cause any incompatibility. Do not short-circuit
2390 dynamic objects; their section list may be emptied by
2391 elf_link_add_object_symbols.
2393 Also check to see if there are no code sections in the input.
2394 In this case there is no need to check for code specific flags.
2395 XXX - do we need to worry about floating-point format compatability
2396 in data sections ? */
2397 if (!(ibfd
->flags
& DYNAMIC
))
2399 bfd_boolean null_input_bfd
= TRUE
;
2400 bfd_boolean only_data_sections
= TRUE
;
2402 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2404 /* Ignore synthetic glue sections. */
2405 if (strcmp (sec
->name
, ".glue_7")
2406 && strcmp (sec
->name
, ".glue_7t"))
2408 if ((bfd_get_section_flags (ibfd
, sec
)
2409 & (SEC_LOAD
| SEC_CODE
| SEC_HAS_CONTENTS
))
2410 == (SEC_LOAD
| SEC_CODE
| SEC_HAS_CONTENTS
))
2411 only_data_sections
= FALSE
;
2413 null_input_bfd
= FALSE
;
2418 if (null_input_bfd
|| only_data_sections
)
2422 /* Complain about various flag mismatches. */
2423 if (EF_ARM_EABI_VERSION (in_flags
) != EF_ARM_EABI_VERSION (out_flags
))
2426 (_("ERROR: %B is compiled for EABI version %d, whereas %B is compiled for version %d"),
2428 (in_flags
& EF_ARM_EABIMASK
) >> 24,
2429 (out_flags
& EF_ARM_EABIMASK
) >> 24);
2433 /* Not sure what needs to be checked for EABI versions >= 1. */
2434 if (EF_ARM_EABI_VERSION (in_flags
) == EF_ARM_EABI_UNKNOWN
)
2436 if ((in_flags
& EF_ARM_APCS_26
) != (out_flags
& EF_ARM_APCS_26
))
2439 (_("ERROR: %B is compiled for APCS-%d, whereas target %B uses APCS-%d"),
2441 in_flags
& EF_ARM_APCS_26
? 26 : 32,
2442 out_flags
& EF_ARM_APCS_26
? 26 : 32);
2443 flags_compatible
= FALSE
;
2446 if ((in_flags
& EF_ARM_APCS_FLOAT
) != (out_flags
& EF_ARM_APCS_FLOAT
))
2448 if (in_flags
& EF_ARM_APCS_FLOAT
)
2450 (_("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers"),
2454 (_("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers"),
2457 flags_compatible
= FALSE
;
2460 if ((in_flags
& EF_ARM_VFP_FLOAT
) != (out_flags
& EF_ARM_VFP_FLOAT
))
2462 if (in_flags
& EF_ARM_VFP_FLOAT
)
2464 (_("ERROR: %B uses VFP instructions, whereas %B does not"),
2468 (_("ERROR: %B uses FPA instructions, whereas %B does not"),
2471 flags_compatible
= FALSE
;
2474 if ((in_flags
& EF_ARM_MAVERICK_FLOAT
) != (out_flags
& EF_ARM_MAVERICK_FLOAT
))
2476 if (in_flags
& EF_ARM_MAVERICK_FLOAT
)
2478 (_("ERROR: %B uses Maverick instructions, whereas %B does not"),
2482 (_("ERROR: %B does not use Maverick instructions, whereas %B does"),
2485 flags_compatible
= FALSE
;
2488 #ifdef EF_ARM_SOFT_FLOAT
2489 if ((in_flags
& EF_ARM_SOFT_FLOAT
) != (out_flags
& EF_ARM_SOFT_FLOAT
))
2491 /* We can allow interworking between code that is VFP format
2492 layout, and uses either soft float or integer regs for
2493 passing floating point arguments and results. We already
2494 know that the APCS_FLOAT flags match; similarly for VFP
2496 if ((in_flags
& EF_ARM_APCS_FLOAT
) != 0
2497 || (in_flags
& EF_ARM_VFP_FLOAT
) == 0)
2499 if (in_flags
& EF_ARM_SOFT_FLOAT
)
2501 (_("ERROR: %B uses software FP, whereas %B uses hardware FP"),
2505 (_("ERROR: %B uses hardware FP, whereas %B uses software FP"),
2508 flags_compatible
= FALSE
;
2513 /* Interworking mismatch is only a warning. */
2514 if ((in_flags
& EF_ARM_INTERWORK
) != (out_flags
& EF_ARM_INTERWORK
))
2516 if (in_flags
& EF_ARM_INTERWORK
)
2519 (_("Warning: %B supports interworking, whereas %B does not"),
2525 (_("Warning: %B does not support interworking, whereas %B does"),
2531 return flags_compatible
;
2534 /* Display the flags field. */
2537 elf32_arm_print_private_bfd_data (bfd
*abfd
, void * ptr
)
2539 FILE * file
= (FILE *) ptr
;
2540 unsigned long flags
;
2542 BFD_ASSERT (abfd
!= NULL
&& ptr
!= NULL
);
2544 /* Print normal ELF private data. */
2545 _bfd_elf_print_private_bfd_data (abfd
, ptr
);
2547 flags
= elf_elfheader (abfd
)->e_flags
;
2548 /* Ignore init flag - it may not be set, despite the flags field
2549 containing valid data. */
2551 /* xgettext:c-format */
2552 fprintf (file
, _("private flags = %lx:"), elf_elfheader (abfd
)->e_flags
);
2554 switch (EF_ARM_EABI_VERSION (flags
))
2556 case EF_ARM_EABI_UNKNOWN
:
2557 /* The following flag bits are GNU extensions and not part of the
2558 official ARM ELF extended ABI. Hence they are only decoded if
2559 the EABI version is not set. */
2560 if (flags
& EF_ARM_INTERWORK
)
2561 fprintf (file
, _(" [interworking enabled]"));
2563 if (flags
& EF_ARM_APCS_26
)
2564 fprintf (file
, " [APCS-26]");
2566 fprintf (file
, " [APCS-32]");
2568 if (flags
& EF_ARM_VFP_FLOAT
)
2569 fprintf (file
, _(" [VFP float format]"));
2570 else if (flags
& EF_ARM_MAVERICK_FLOAT
)
2571 fprintf (file
, _(" [Maverick float format]"));
2573 fprintf (file
, _(" [FPA float format]"));
2575 if (flags
& EF_ARM_APCS_FLOAT
)
2576 fprintf (file
, _(" [floats passed in float registers]"));
2578 if (flags
& EF_ARM_PIC
)
2579 fprintf (file
, _(" [position independent]"));
2581 if (flags
& EF_ARM_NEW_ABI
)
2582 fprintf (file
, _(" [new ABI]"));
2584 if (flags
& EF_ARM_OLD_ABI
)
2585 fprintf (file
, _(" [old ABI]"));
2587 if (flags
& EF_ARM_SOFT_FLOAT
)
2588 fprintf (file
, _(" [software FP]"));
2590 flags
&= ~(EF_ARM_INTERWORK
| EF_ARM_APCS_26
| EF_ARM_APCS_FLOAT
2591 | EF_ARM_PIC
| EF_ARM_NEW_ABI
| EF_ARM_OLD_ABI
2592 | EF_ARM_SOFT_FLOAT
| EF_ARM_VFP_FLOAT
2593 | EF_ARM_MAVERICK_FLOAT
);
2596 case EF_ARM_EABI_VER1
:
2597 fprintf (file
, _(" [Version1 EABI]"));
2599 if (flags
& EF_ARM_SYMSARESORTED
)
2600 fprintf (file
, _(" [sorted symbol table]"));
2602 fprintf (file
, _(" [unsorted symbol table]"));
2604 flags
&= ~ EF_ARM_SYMSARESORTED
;
2607 case EF_ARM_EABI_VER2
:
2608 fprintf (file
, _(" [Version2 EABI]"));
2610 if (flags
& EF_ARM_SYMSARESORTED
)
2611 fprintf (file
, _(" [sorted symbol table]"));
2613 fprintf (file
, _(" [unsorted symbol table]"));
2615 if (flags
& EF_ARM_DYNSYMSUSESEGIDX
)
2616 fprintf (file
, _(" [dynamic symbols use segment index]"));
2618 if (flags
& EF_ARM_MAPSYMSFIRST
)
2619 fprintf (file
, _(" [mapping symbols precede others]"));
2621 flags
&= ~(EF_ARM_SYMSARESORTED
| EF_ARM_DYNSYMSUSESEGIDX
2622 | EF_ARM_MAPSYMSFIRST
);
2625 case EF_ARM_EABI_VER3
:
2626 fprintf (file
, _(" [Version3 EABI]"));
2628 if (flags
& EF_ARM_BE8
)
2629 fprintf (file
, _(" [BE8]"));
2631 if (flags
& EF_ARM_LE8
)
2632 fprintf (file
, _(" [LE8]"));
2634 flags
&= ~(EF_ARM_LE8
| EF_ARM_BE8
);
2638 fprintf (file
, _(" <EABI version unrecognised>"));
2642 flags
&= ~ EF_ARM_EABIMASK
;
2644 if (flags
& EF_ARM_RELEXEC
)
2645 fprintf (file
, _(" [relocatable executable]"));
2647 if (flags
& EF_ARM_HASENTRY
)
2648 fprintf (file
, _(" [has entry point]"));
2650 flags
&= ~ (EF_ARM_RELEXEC
| EF_ARM_HASENTRY
);
2653 fprintf (file
, _("<Unrecognised flag bits set>"));
2661 elf32_arm_get_symbol_type (Elf_Internal_Sym
* elf_sym
, int type
)
2663 switch (ELF_ST_TYPE (elf_sym
->st_info
))
2666 return ELF_ST_TYPE (elf_sym
->st_info
);
2669 /* If the symbol is not an object, return the STT_ARM_16BIT flag.
2670 This allows us to distinguish between data used by Thumb instructions
2671 and non-data (which is probably code) inside Thumb regions of an
2673 if (type
!= STT_OBJECT
)
2674 return ELF_ST_TYPE (elf_sym
->st_info
);
2685 elf32_arm_gc_mark_hook (asection
* sec
,
2686 struct bfd_link_info
* info ATTRIBUTE_UNUSED
,
2687 Elf_Internal_Rela
* rel
,
2688 struct elf_link_hash_entry
* h
,
2689 Elf_Internal_Sym
* sym
)
2693 switch (ELF32_R_TYPE (rel
->r_info
))
2695 case R_ARM_GNU_VTINHERIT
:
2696 case R_ARM_GNU_VTENTRY
:
2700 switch (h
->root
.type
)
2702 case bfd_link_hash_defined
:
2703 case bfd_link_hash_defweak
:
2704 return h
->root
.u
.def
.section
;
2706 case bfd_link_hash_common
:
2707 return h
->root
.u
.c
.p
->section
;
2715 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
2720 /* Update the got entry reference counts for the section being removed. */
2723 elf32_arm_gc_sweep_hook (bfd
* abfd ATTRIBUTE_UNUSED
,
2724 struct bfd_link_info
* info ATTRIBUTE_UNUSED
,
2725 asection
* sec ATTRIBUTE_UNUSED
,
2726 const Elf_Internal_Rela
* relocs ATTRIBUTE_UNUSED
)
2728 Elf_Internal_Shdr
*symtab_hdr
;
2729 struct elf_link_hash_entry
**sym_hashes
;
2730 bfd_signed_vma
*local_got_refcounts
;
2731 const Elf_Internal_Rela
*rel
, *relend
;
2732 unsigned long r_symndx
;
2733 struct elf_link_hash_entry
*h
;
2735 elf_section_data (sec
)->local_dynrel
= NULL
;
2737 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2738 sym_hashes
= elf_sym_hashes (abfd
);
2739 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2741 relend
= relocs
+ sec
->reloc_count
;
2742 for (rel
= relocs
; rel
< relend
; rel
++)
2743 switch (ELF32_R_TYPE (rel
->r_info
))
2746 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2747 if (r_symndx
>= symtab_hdr
->sh_info
)
2749 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2750 if (h
->got
.refcount
> 0)
2751 h
->got
.refcount
-= 1;
2753 else if (local_got_refcounts
!= NULL
)
2755 if (local_got_refcounts
[r_symndx
] > 0)
2756 local_got_refcounts
[r_symndx
] -= 1;
2765 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2766 if (r_symndx
>= symtab_hdr
->sh_info
)
2768 struct elf32_arm_link_hash_entry
*eh
;
2769 struct elf32_arm_relocs_copied
**pp
;
2770 struct elf32_arm_relocs_copied
*p
;
2772 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2774 if (h
->plt
.refcount
> 0)
2775 h
->plt
.refcount
-= 1;
2777 if (ELF32_R_TYPE (rel
->r_info
) == R_ARM_ABS32
2778 || ELF32_R_TYPE (rel
->r_info
) == R_ARM_REL32
2779 || ELF32_R_TYPE (rel
->r_info
) == R_ARM_TARGET1
)
2781 eh
= (struct elf32_arm_link_hash_entry
*) h
;
2783 for (pp
= &eh
->relocs_copied
; (p
= *pp
) != NULL
;
2785 if (p
->section
== sec
)
2803 /* Look through the relocs for a section during the first phase. */
2806 elf32_arm_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
2807 asection
*sec
, const Elf_Internal_Rela
*relocs
)
2809 Elf_Internal_Shdr
*symtab_hdr
;
2810 struct elf_link_hash_entry
**sym_hashes
;
2811 struct elf_link_hash_entry
**sym_hashes_end
;
2812 const Elf_Internal_Rela
*rel
;
2813 const Elf_Internal_Rela
*rel_end
;
2816 bfd_vma
*local_got_offsets
;
2817 struct elf32_arm_link_hash_table
*htab
;
2819 if (info
->relocatable
)
2822 htab
= elf32_arm_hash_table (info
);
2825 dynobj
= elf_hash_table (info
)->dynobj
;
2826 local_got_offsets
= elf_local_got_offsets (abfd
);
2828 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2829 sym_hashes
= elf_sym_hashes (abfd
);
2830 sym_hashes_end
= sym_hashes
2831 + symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
2833 if (!elf_bad_symtab (abfd
))
2834 sym_hashes_end
-= symtab_hdr
->sh_info
;
2836 rel_end
= relocs
+ sec
->reloc_count
;
2837 for (rel
= relocs
; rel
< rel_end
; rel
++)
2839 struct elf_link_hash_entry
*h
;
2840 unsigned long r_symndx
;
2842 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2843 if (r_symndx
< symtab_hdr
->sh_info
)
2846 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2848 switch (ELF32_R_TYPE (rel
->r_info
))
2851 /* This symbol requires a global offset table entry. */
2858 bfd_signed_vma
*local_got_refcounts
;
2860 /* This is a global offset table entry for a local symbol. */
2861 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2862 if (local_got_refcounts
== NULL
)
2866 size
= symtab_hdr
->sh_info
;
2867 size
*= (sizeof (bfd_signed_vma
) + sizeof (char));
2868 local_got_refcounts
= bfd_zalloc (abfd
, size
);
2869 if (local_got_refcounts
== NULL
)
2871 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
2873 local_got_refcounts
[r_symndx
] += 1;
2879 if (htab
->sgot
== NULL
)
2881 if (htab
->root
.dynobj
== NULL
)
2882 htab
->root
.dynobj
= abfd
;
2883 if (!create_got_section (htab
->root
.dynobj
, info
))
2895 /* If this reloc is in a read-only section, we might
2896 need a copy reloc. We can't check reliably at this
2897 stage whether the section is read-only, as input
2898 sections have not yet been mapped to output sections.
2899 Tentatively set the flag for now, and correct in
2900 adjust_dynamic_symbol. */
2902 h
->elf_link_hash_flags
|= ELF_LINK_NON_GOT_REF
;
2904 /* We may need a .plt entry if the function this reloc
2905 refers to is in a different object. We can't tell for
2906 sure yet, because something later might force the
2908 if (ELF32_R_TYPE (rel
->r_info
) == R_ARM_PC24
2909 || ELF32_R_TYPE (rel
->r_info
) == R_ARM_PLT32
)
2910 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_PLT
;
2912 /* If we create a PLT entry, this relocation will reference
2913 it, even if it's an ABS32 relocation. */
2914 h
->plt
.refcount
+= 1;
2917 /* If we are creating a shared library, and this is a reloc
2918 against a global symbol, or a non PC relative reloc
2919 against a local symbol, then we need to copy the reloc
2920 into the shared library. However, if we are linking with
2921 -Bsymbolic, we do not need to copy a reloc against a
2922 global symbol which is defined in an object we are
2923 including in the link (i.e., DEF_REGULAR is set). At
2924 this point we have not seen all the input files, so it is
2925 possible that DEF_REGULAR is not set now but will be set
2926 later (it is never cleared). We account for that
2927 possibility below by storing information in the
2928 relocs_copied field of the hash table entry. */
2930 && (sec
->flags
& SEC_ALLOC
) != 0
2931 && ((ELF32_R_TYPE (rel
->r_info
) != R_ARM_PC24
2932 && ELF32_R_TYPE (rel
->r_info
) != R_ARM_PLT32
2933 && ELF32_R_TYPE (rel
->r_info
) != R_ARM_REL32
2934 && ELF32_R_TYPE (rel
->r_info
) != R_ARM_TARGET1
)
2936 && (! info
->symbolic
2937 || (h
->elf_link_hash_flags
2938 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
2940 struct elf32_arm_relocs_copied
*p
, **head
;
2942 /* When creating a shared object, we must copy these
2943 reloc types into the output file. We create a reloc
2944 section in dynobj and make room for this reloc. */
2949 name
= (bfd_elf_string_from_elf_section
2951 elf_elfheader (abfd
)->e_shstrndx
,
2952 elf_section_data (sec
)->rel_hdr
.sh_name
));
2956 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
2957 && strcmp (bfd_get_section_name (abfd
, sec
),
2960 sreloc
= bfd_get_section_by_name (dynobj
, name
);
2965 sreloc
= bfd_make_section (dynobj
, name
);
2966 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
2967 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2968 if ((sec
->flags
& SEC_ALLOC
) != 0
2969 /* BPABI objects never have dynamic
2970 relocations mapped. */
2971 && !htab
->symbian_p
)
2972 flags
|= SEC_ALLOC
| SEC_LOAD
;
2974 || ! bfd_set_section_flags (dynobj
, sreloc
, flags
)
2975 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
2979 elf_section_data (sec
)->sreloc
= sreloc
;
2982 /* If this is a global symbol, we count the number of
2983 relocations we need for this symbol. */
2986 head
= &((struct elf32_arm_link_hash_entry
*) h
)->relocs_copied
;
2990 /* Track dynamic relocs needed for local syms too.
2991 We really need local syms available to do this
2995 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
3000 head
= ((struct elf32_arm_relocs_copied
**)
3001 &elf_section_data (s
)->local_dynrel
);
3005 if (p
== NULL
|| p
->section
!= sec
)
3007 bfd_size_type amt
= sizeof *p
;
3009 p
= bfd_alloc (htab
->root
.dynobj
, amt
);
3018 if (ELF32_R_TYPE (rel
->r_info
) == R_ARM_ABS32
3019 || ELF32_R_TYPE (rel
->r_info
) == R_ARM_REL32
3020 || ELF32_R_TYPE (rel
->r_info
) == R_ARM_TARGET1
)
3025 /* This relocation describes the C++ object vtable hierarchy.
3026 Reconstruct it for later use during GC. */
3027 case R_ARM_GNU_VTINHERIT
:
3028 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
3032 /* This relocation describes which C++ vtable entries are actually
3033 used. Record for later use during GC. */
3034 case R_ARM_GNU_VTENTRY
:
3035 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
3045 is_arm_mapping_symbol_name (const char * name
)
3047 return (name
!= NULL
)
3049 && ((name
[1] == 'a') || (name
[1] == 't') || (name
[1] == 'd'))
3053 /* This is a copy of elf_find_function() from elf.c except that
3054 ARM mapping symbols are ignored when looking for function names
3055 and STT_ARM_TFUNC is considered to a function type. */
3058 arm_elf_find_function (bfd
* abfd ATTRIBUTE_UNUSED
,
3062 const char ** filename_ptr
,
3063 const char ** functionname_ptr
)
3065 const char * filename
= NULL
;
3066 asymbol
* func
= NULL
;
3067 bfd_vma low_func
= 0;
3070 for (p
= symbols
; *p
!= NULL
; p
++)
3074 q
= (elf_symbol_type
*) *p
;
3076 if (bfd_get_section (&q
->symbol
) != section
)
3079 switch (ELF_ST_TYPE (q
->internal_elf_sym
.st_info
))
3084 filename
= bfd_asymbol_name (&q
->symbol
);
3088 /* Skip $a and $t symbols. */
3089 if ((q
->symbol
.flags
& BSF_LOCAL
)
3090 && is_arm_mapping_symbol_name (q
->symbol
.name
))
3094 if (q
->symbol
.section
== section
3095 && q
->symbol
.value
>= low_func
3096 && q
->symbol
.value
<= offset
)
3098 func
= (asymbol
*) q
;
3099 low_func
= q
->symbol
.value
;
3109 *filename_ptr
= filename
;
3110 if (functionname_ptr
)
3111 *functionname_ptr
= bfd_asymbol_name (func
);
3117 /* Find the nearest line to a particular section and offset, for error
3118 reporting. This code is a duplicate of the code in elf.c, except
3119 that it uses arm_elf_find_function. */
3122 elf32_arm_find_nearest_line (bfd
* abfd
,
3126 const char ** filename_ptr
,
3127 const char ** functionname_ptr
,
3128 unsigned int * line_ptr
)
3130 bfd_boolean found
= FALSE
;
3132 /* We skip _bfd_dwarf1_find_nearest_line since no known ARM toolchain uses it. */
3134 if (_bfd_dwarf2_find_nearest_line (abfd
, section
, symbols
, offset
,
3135 filename_ptr
, functionname_ptr
,
3137 & elf_tdata (abfd
)->dwarf2_find_line_info
))
3139 if (!*functionname_ptr
)
3140 arm_elf_find_function (abfd
, section
, symbols
, offset
,
3141 *filename_ptr
? NULL
: filename_ptr
,
3147 if (! _bfd_stab_section_find_nearest_line (abfd
, symbols
, section
, offset
,
3148 & found
, filename_ptr
,
3149 functionname_ptr
, line_ptr
,
3150 & elf_tdata (abfd
)->line_info
))
3153 if (found
&& (*functionname_ptr
|| *line_ptr
))
3156 if (symbols
== NULL
)
3159 if (! arm_elf_find_function (abfd
, section
, symbols
, offset
,
3160 filename_ptr
, functionname_ptr
))
3167 /* Adjust a symbol defined by a dynamic object and referenced by a
3168 regular object. The current definition is in some section of the
3169 dynamic object, but we're not including those sections. We have to
3170 change the definition to something the rest of the link can
3174 elf32_arm_adjust_dynamic_symbol (struct bfd_link_info
* info
,
3175 struct elf_link_hash_entry
* h
)
3179 unsigned int power_of_two
;
3181 dynobj
= elf_hash_table (info
)->dynobj
;
3183 /* Make sure we know what is going on here. */
3184 BFD_ASSERT (dynobj
!= NULL
3185 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
)
3186 || h
->weakdef
!= NULL
3187 || ((h
->elf_link_hash_flags
3188 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3189 && (h
->elf_link_hash_flags
3190 & ELF_LINK_HASH_REF_REGULAR
) != 0
3191 && (h
->elf_link_hash_flags
3192 & ELF_LINK_HASH_DEF_REGULAR
) == 0)));
3194 /* If this is a function, put it in the procedure linkage table. We
3195 will fill in the contents of the procedure linkage table later,
3196 when we know the address of the .got section. */
3197 if (h
->type
== STT_FUNC
3198 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0)
3200 if (h
->plt
.refcount
<= 0
3201 || SYMBOL_CALLS_LOCAL (info
, h
)
3202 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3203 && h
->root
.type
== bfd_link_hash_undefweak
))
3205 /* This case can occur if we saw a PLT32 reloc in an input
3206 file, but the symbol was never referred to by a dynamic
3207 object, or if all references were garbage collected. In
3208 such a case, we don't actually need to build a procedure
3209 linkage table, and we can just do a PC24 reloc instead. */
3210 h
->plt
.offset
= (bfd_vma
) -1;
3211 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
3217 /* It's possible that we incorrectly decided a .plt reloc was
3218 needed for an R_ARM_PC24 reloc to a non-function sym in
3219 check_relocs. We can't decide accurately between function and
3220 non-function syms in check-relocs; Objects loaded later in
3221 the link may change h->type. So fix it now. */
3222 h
->plt
.offset
= (bfd_vma
) -1;
3224 /* If this is a weak symbol, and there is a real definition, the
3225 processor independent code will have arranged for us to see the
3226 real definition first, and we can just use the same value. */
3227 if (h
->weakdef
!= NULL
)
3229 BFD_ASSERT (h
->weakdef
->root
.type
== bfd_link_hash_defined
3230 || h
->weakdef
->root
.type
== bfd_link_hash_defweak
);
3231 h
->root
.u
.def
.section
= h
->weakdef
->root
.u
.def
.section
;
3232 h
->root
.u
.def
.value
= h
->weakdef
->root
.u
.def
.value
;
3236 /* This is a reference to a symbol defined by a dynamic object which
3237 is not a function. */
3239 /* If we are creating a shared library, we must presume that the
3240 only references to the symbol are via the global offset table.
3241 For such cases we need not do anything here; the relocations will
3242 be handled correctly by relocate_section. */
3246 /* We must allocate the symbol in our .dynbss section, which will
3247 become part of the .bss section of the executable. There will be
3248 an entry for this symbol in the .dynsym section. The dynamic
3249 object will contain position independent code, so all references
3250 from the dynamic object to this symbol will go through the global
3251 offset table. The dynamic linker will use the .dynsym entry to
3252 determine the address it must put in the global offset table, so
3253 both the dynamic object and the regular object will refer to the
3254 same memory location for the variable. */
3255 s
= bfd_get_section_by_name (dynobj
, ".dynbss");
3256 BFD_ASSERT (s
!= NULL
);
3258 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to
3259 copy the initial value out of the dynamic object and into the
3260 runtime process image. We need to remember the offset into the
3261 .rel.bss section we are going to use. */
3262 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
3266 srel
= bfd_get_section_by_name (dynobj
, ".rel.bss");
3267 BFD_ASSERT (srel
!= NULL
);
3268 srel
->size
+= sizeof (Elf32_External_Rel
);
3269 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_COPY
;
3272 /* We need to figure out the alignment required for this symbol. I
3273 have no idea how ELF linkers handle this. */
3274 power_of_two
= bfd_log2 (h
->size
);
3275 if (power_of_two
> 3)
3278 /* Apply the required alignment. */
3279 s
->size
= BFD_ALIGN (s
->size
, (bfd_size_type
) (1 << power_of_two
));
3280 if (power_of_two
> bfd_get_section_alignment (dynobj
, s
))
3282 if (! bfd_set_section_alignment (dynobj
, s
, power_of_two
))
3286 /* Define the symbol as being at this point in the section. */
3287 h
->root
.u
.def
.section
= s
;
3288 h
->root
.u
.def
.value
= s
->size
;
3290 /* Increment the section size to make room for the symbol. */
3296 /* Allocate space in .plt, .got and associated reloc sections for
3300 allocate_dynrelocs (struct elf_link_hash_entry
*h
, void * inf
)
3302 struct bfd_link_info
*info
;
3303 struct elf32_arm_link_hash_table
*htab
;
3304 struct elf32_arm_link_hash_entry
*eh
;
3305 struct elf32_arm_relocs_copied
*p
;
3307 if (h
->root
.type
== bfd_link_hash_indirect
)
3310 if (h
->root
.type
== bfd_link_hash_warning
)
3311 /* When warning symbols are created, they **replace** the "real"
3312 entry in the hash table, thus we never get to see the real
3313 symbol in a hash traversal. So look at it now. */
3314 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3316 info
= (struct bfd_link_info
*) inf
;
3317 htab
= elf32_arm_hash_table (info
);
3319 if (htab
->root
.dynamic_sections_created
3320 && h
->plt
.refcount
> 0)
3322 /* Make sure this symbol is output as a dynamic symbol.
3323 Undefined weak syms won't yet be marked as dynamic. */
3324 if (h
->dynindx
== -1
3325 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3327 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3332 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
3334 asection
*s
= htab
->splt
;
3336 /* If this is the first .plt entry, make room for the special
3339 s
->size
+= htab
->plt_header_size
;
3341 h
->plt
.offset
= s
->size
;
3343 /* If this symbol is not defined in a regular file, and we are
3344 not generating a shared library, then set the symbol to this
3345 location in the .plt. This is required to make function
3346 pointers compare as equal between the normal executable and
3347 the shared library. */
3349 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3351 h
->root
.u
.def
.section
= s
;
3352 h
->root
.u
.def
.value
= h
->plt
.offset
;
3355 /* Make room for this entry. */
3356 s
->size
+= htab
->plt_entry_size
;
3358 if (!htab
->symbian_p
)
3359 /* We also need to make an entry in the .got.plt section, which
3360 will be placed in the .got section by the linker script. */
3361 htab
->sgotplt
->size
+= 4;
3363 /* We also need to make an entry in the .rel.plt section. */
3364 htab
->srelplt
->size
+= sizeof (Elf32_External_Rel
);
3368 h
->plt
.offset
= (bfd_vma
) -1;
3369 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
3374 h
->plt
.offset
= (bfd_vma
) -1;
3375 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
3378 if (h
->got
.refcount
> 0)
3383 /* Make sure this symbol is output as a dynamic symbol.
3384 Undefined weak syms won't yet be marked as dynamic. */
3385 if (h
->dynindx
== -1
3386 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3388 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3392 if (!htab
->symbian_p
)
3395 h
->got
.offset
= s
->size
;
3397 dyn
= htab
->root
.dynamic_sections_created
;
3398 if ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3399 || h
->root
.type
!= bfd_link_hash_undefweak
)
3401 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
3402 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
3406 h
->got
.offset
= (bfd_vma
) -1;
3408 eh
= (struct elf32_arm_link_hash_entry
*) h
;
3409 if (eh
->relocs_copied
== NULL
)
3412 /* In the shared -Bsymbolic case, discard space allocated for
3413 dynamic pc-relative relocs against symbols which turn out to be
3414 defined in regular objects. For the normal shared case, discard
3415 space for pc-relative relocs that have become local due to symbol
3416 visibility changes. */
3420 /* Discard relocs on undefined weak syms with non-default
3422 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3423 && h
->root
.type
== bfd_link_hash_undefweak
)
3424 eh
->relocs_copied
= NULL
;
3428 /* For the non-shared case, discard space for relocs against
3429 symbols which turn out to need copy relocs or are not
3432 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
) == 0
3433 && (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3434 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3435 || (htab
->root
.dynamic_sections_created
3436 && (h
->root
.type
== bfd_link_hash_undefweak
3437 || h
->root
.type
== bfd_link_hash_undefined
))))
3439 /* Make sure this symbol is output as a dynamic symbol.
3440 Undefined weak syms won't yet be marked as dynamic. */
3441 if (h
->dynindx
== -1
3442 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3444 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3448 /* If that succeeded, we know we'll be keeping all the
3450 if (h
->dynindx
!= -1)
3454 eh
->relocs_copied
= NULL
;
3459 /* Finally, allocate space. */
3460 for (p
= eh
->relocs_copied
; p
!= NULL
; p
= p
->next
)
3462 asection
*sreloc
= elf_section_data (p
->section
)->sreloc
;
3463 sreloc
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
3469 /* Set the sizes of the dynamic sections. */
3472 elf32_arm_size_dynamic_sections (bfd
* output_bfd ATTRIBUTE_UNUSED
,
3473 struct bfd_link_info
* info
)
3480 struct elf32_arm_link_hash_table
*htab
;
3482 htab
= elf32_arm_hash_table (info
);
3483 dynobj
= elf_hash_table (info
)->dynobj
;
3484 BFD_ASSERT (dynobj
!= NULL
);
3486 if (elf_hash_table (info
)->dynamic_sections_created
)
3488 /* Set the contents of the .interp section to the interpreter. */
3489 if (info
->executable
)
3491 s
= bfd_get_section_by_name (dynobj
, ".interp");
3492 BFD_ASSERT (s
!= NULL
);
3493 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
3494 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
3498 /* Set up .got offsets for local syms, and space for local dynamic
3500 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
3502 bfd_signed_vma
*local_got
;
3503 bfd_signed_vma
*end_local_got
;
3504 char *local_tls_type
;
3505 bfd_size_type locsymcount
;
3506 Elf_Internal_Shdr
*symtab_hdr
;
3509 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
3512 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3514 struct elf32_arm_relocs_copied
*p
;
3516 for (p
= *((struct elf32_arm_relocs_copied
**)
3517 &elf_section_data (s
)->local_dynrel
);
3521 if (!bfd_is_abs_section (p
->section
)
3522 && bfd_is_abs_section (p
->section
->output_section
))
3524 /* Input section has been discarded, either because
3525 it is a copy of a linkonce section or due to
3526 linker script /DISCARD/, so we'll be discarding
3529 else if (p
->count
!= 0)
3531 srel
= elf_section_data (p
->section
)->sreloc
;
3532 srel
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
3533 if ((p
->section
->output_section
->flags
& SEC_READONLY
) != 0)
3534 info
->flags
|= DF_TEXTREL
;
3539 local_got
= elf_local_got_refcounts (ibfd
);
3543 symtab_hdr
= &elf_tdata (ibfd
)->symtab_hdr
;
3544 locsymcount
= symtab_hdr
->sh_info
;
3545 end_local_got
= local_got
+ locsymcount
;
3547 srel
= htab
->srelgot
;
3548 for (; local_got
< end_local_got
; ++local_got
, ++local_tls_type
)
3552 *local_got
= s
->size
;
3555 srel
->size
+= sizeof (Elf32_External_Rel
);
3558 *local_got
= (bfd_vma
) -1;
3562 /* Allocate global sym .plt and .got entries, and space for global
3563 sym dynamic relocs. */
3564 elf_link_hash_traverse (& htab
->root
, allocate_dynrelocs
, info
);
3566 /* The check_relocs and adjust_dynamic_symbol entry points have
3567 determined the sizes of the various dynamic sections. Allocate
3571 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3576 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3579 /* It's OK to base decisions on the section name, because none
3580 of the dynobj section names depend upon the input files. */
3581 name
= bfd_get_section_name (dynobj
, s
);
3585 if (strcmp (name
, ".plt") == 0)
3589 /* Strip this section if we don't need it; see the
3595 /* Remember whether there is a PLT. */
3599 else if (strncmp (name
, ".rel", 4) == 0)
3603 /* If we don't need this section, strip it from the
3604 output file. This is mostly to handle .rel.bss and
3605 .rel.plt. We must create both sections in
3606 create_dynamic_sections, because they must be created
3607 before the linker maps input sections to output
3608 sections. The linker does that before
3609 adjust_dynamic_symbol is called, and it is that
3610 function which decides whether anything needs to go
3611 into these sections. */
3616 /* Remember whether there are any reloc sections other
3618 if (strcmp (name
, ".rel.plt") != 0)
3621 /* We use the reloc_count field as a counter if we need
3622 to copy relocs into the output file. */
3626 else if (strncmp (name
, ".got", 4) != 0)
3628 /* It's not one of our sections, so don't allocate space. */
3634 _bfd_strip_section_from_output (info
, s
);
3638 /* Allocate memory for the section contents. */
3639 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
3640 if (s
->contents
== NULL
&& s
->size
!= 0)
3644 if (elf_hash_table (info
)->dynamic_sections_created
)
3646 /* Add some entries to the .dynamic section. We fill in the
3647 values later, in elf32_arm_finish_dynamic_sections, but we
3648 must add the entries now so that we get the correct size for
3649 the .dynamic section. The DT_DEBUG entry is filled in by the
3650 dynamic linker and used by the debugger. */
3651 #define add_dynamic_entry(TAG, VAL) \
3652 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3656 if (!add_dynamic_entry (DT_DEBUG
, 0))
3662 if ( !add_dynamic_entry (DT_PLTGOT
, 0)
3663 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
3664 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
3665 || !add_dynamic_entry (DT_JMPREL
, 0))
3671 if ( !add_dynamic_entry (DT_REL
, 0)
3672 || !add_dynamic_entry (DT_RELSZ
, 0)
3673 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
3677 if ((info
->flags
& DF_TEXTREL
) != 0)
3679 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3681 info
->flags
|= DF_TEXTREL
;
3684 #undef add_synamic_entry
3689 /* Finish up dynamic symbol handling. We set the contents of various
3690 dynamic sections here. */
3693 elf32_arm_finish_dynamic_symbol (bfd
* output_bfd
, struct bfd_link_info
* info
,
3694 struct elf_link_hash_entry
* h
, Elf_Internal_Sym
* sym
)
3697 struct elf32_arm_link_hash_table
*htab
;
3699 dynobj
= elf_hash_table (info
)->dynobj
;
3700 htab
= elf32_arm_hash_table (info
);
3702 if (h
->plt
.offset
!= (bfd_vma
) -1)
3708 Elf_Internal_Rela rel
;
3710 /* This symbol has an entry in the procedure linkage table. Set
3713 BFD_ASSERT (h
->dynindx
!= -1);
3715 splt
= bfd_get_section_by_name (dynobj
, ".plt");
3716 srel
= bfd_get_section_by_name (dynobj
, ".rel.plt");
3717 BFD_ASSERT (splt
!= NULL
&& srel
!= NULL
);
3719 /* Get the index in the procedure linkage table which
3720 corresponds to this symbol. This is the index of this symbol
3721 in all the symbols for which we are making plt entries. The
3722 first entry in the procedure linkage table is reserved. */
3723 plt_index
= ((h
->plt
.offset
- htab
->plt_header_size
)
3724 / htab
->plt_entry_size
);
3726 /* Fill in the entry in the procedure linkage table. */
3727 if (htab
->symbian_p
)
3730 for (i
= 0; i
< htab
->plt_entry_size
/ 4; ++i
)
3731 bfd_put_32 (output_bfd
,
3732 elf32_arm_symbian_plt_entry
[i
],
3733 splt
->contents
+ h
->plt
.offset
+ 4 * i
);
3735 /* Fill in the entry in the .rel.plt section. */
3736 rel
.r_offset
= (splt
->output_offset
3737 + h
->plt
.offset
+ 4 * (i
- 1));
3738 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_GLOB_DAT
);
3743 bfd_vma got_displacement
;
3746 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
3747 BFD_ASSERT (sgot
!= NULL
);
3749 /* Get the offset into the .got table of the entry that
3750 corresponds to this function. Each .got entry is 4 bytes.
3751 The first three are reserved. */
3752 got_offset
= (plt_index
+ 3) * 4;
3754 /* Calculate the displacement between the PLT slot and the
3755 entry in the GOT. */
3756 got_displacement
= (sgot
->output_section
->vma
3757 + sgot
->output_offset
3759 - splt
->output_section
->vma
3760 - splt
->output_offset
3764 BFD_ASSERT ((got_displacement
& 0xf0000000) == 0);
3766 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[0] | ((got_displacement
& 0x0ff00000) >> 20),
3767 splt
->contents
+ h
->plt
.offset
+ 0);
3768 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[1] | ((got_displacement
& 0x000ff000) >> 12),
3769 splt
->contents
+ h
->plt
.offset
+ 4);
3770 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[2] | (got_displacement
& 0x00000fff),
3771 splt
->contents
+ h
->plt
.offset
+ 8);
3772 #ifdef FOUR_WORD_PLT
3773 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[3],
3774 splt
->contents
+ h
->plt
.offset
+ 12);
3777 /* Fill in the entry in the global offset table. */
3778 bfd_put_32 (output_bfd
,
3779 (splt
->output_section
->vma
3780 + splt
->output_offset
),
3781 sgot
->contents
+ got_offset
);
3783 /* Fill in the entry in the .rel.plt section. */
3784 rel
.r_offset
= (sgot
->output_section
->vma
3785 + sgot
->output_offset
3787 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_JUMP_SLOT
);
3790 loc
= srel
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
3791 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3793 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3795 /* Mark the symbol as undefined, rather than as defined in
3796 the .plt section. Leave the value alone. */
3797 sym
->st_shndx
= SHN_UNDEF
;
3798 /* If the symbol is weak, we do need to clear the value.
3799 Otherwise, the PLT entry would provide a definition for
3800 the symbol even if the symbol wasn't defined anywhere,
3801 and so the symbol would never be NULL. */
3802 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3808 if (h
->got
.offset
!= (bfd_vma
) -1)
3812 Elf_Internal_Rela rel
;
3815 /* This symbol has an entry in the global offset table. Set it
3817 sgot
= bfd_get_section_by_name (dynobj
, ".got");
3818 srel
= bfd_get_section_by_name (dynobj
, ".rel.got");
3819 BFD_ASSERT (sgot
!= NULL
&& srel
!= NULL
);
3821 rel
.r_offset
= (sgot
->output_section
->vma
3822 + sgot
->output_offset
3823 + (h
->got
.offset
&~ (bfd_vma
) 1));
3825 /* If this is a static link, or it is a -Bsymbolic link and the
3826 symbol is defined locally or was forced to be local because
3827 of a version file, we just want to emit a RELATIVE reloc.
3828 The entry in the global offset table will already have been
3829 initialized in the relocate_section function. */
3831 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3833 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3834 rel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
3838 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3839 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ h
->got
.offset
);
3840 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_GLOB_DAT
);
3843 loc
= srel
->contents
+ srel
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3844 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3847 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_COPY
) != 0)
3850 Elf_Internal_Rela rel
;
3853 /* This symbol needs a copy reloc. Set it up. */
3854 BFD_ASSERT (h
->dynindx
!= -1
3855 && (h
->root
.type
== bfd_link_hash_defined
3856 || h
->root
.type
== bfd_link_hash_defweak
));
3858 s
= bfd_get_section_by_name (h
->root
.u
.def
.section
->owner
,
3860 BFD_ASSERT (s
!= NULL
);
3862 rel
.r_offset
= (h
->root
.u
.def
.value
3863 + h
->root
.u
.def
.section
->output_section
->vma
3864 + h
->root
.u
.def
.section
->output_offset
);
3865 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_COPY
);
3866 loc
= s
->contents
+ s
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3867 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3870 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3871 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3872 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
3873 sym
->st_shndx
= SHN_ABS
;
3878 /* Finish up the dynamic sections. */
3881 elf32_arm_finish_dynamic_sections (bfd
* output_bfd
, struct bfd_link_info
* info
)
3887 dynobj
= elf_hash_table (info
)->dynobj
;
3889 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
3890 BFD_ASSERT (elf32_arm_hash_table (info
)->symbian_p
|| sgot
!= NULL
);
3891 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3893 if (elf_hash_table (info
)->dynamic_sections_created
)
3896 Elf32_External_Dyn
*dyncon
, *dynconend
;
3897 struct elf32_arm_link_hash_table
*htab
;
3899 htab
= elf32_arm_hash_table (info
);
3900 splt
= bfd_get_section_by_name (dynobj
, ".plt");
3901 BFD_ASSERT (splt
!= NULL
&& sdyn
!= NULL
);
3903 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3904 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3906 for (; dyncon
< dynconend
; dyncon
++)
3908 Elf_Internal_Dyn dyn
;
3912 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3923 goto get_vma_if_bpabi
;
3926 goto get_vma_if_bpabi
;
3929 goto get_vma_if_bpabi
;
3937 s
= bfd_get_section_by_name (output_bfd
, name
);
3938 BFD_ASSERT (s
!= NULL
);
3939 if (!htab
->symbian_p
)
3940 dyn
.d_un
.d_ptr
= s
->vma
;
3942 /* In the BPABI, tags in the PT_DYNAMIC section point
3943 at the file offset, not the memory address, for the
3944 convenience of the post linker. */
3945 dyn
.d_un
.d_ptr
= s
->filepos
;
3946 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3950 if (htab
->symbian_p
)
3955 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
3956 BFD_ASSERT (s
!= NULL
);
3957 dyn
.d_un
.d_val
= s
->size
;
3958 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3962 if (!htab
->symbian_p
)
3964 /* My reading of the SVR4 ABI indicates that the
3965 procedure linkage table relocs (DT_JMPREL) should be
3966 included in the overall relocs (DT_REL). This is
3967 what Solaris does. However, UnixWare can not handle
3968 that case. Therefore, we override the DT_RELSZ entry
3969 here to make it not include the JMPREL relocs. Since
3970 the linker script arranges for .rel.plt to follow all
3971 other relocation sections, we don't have to worry
3972 about changing the DT_REL entry. */
3973 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
3975 dyn
.d_un
.d_val
-= s
->size
;
3976 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3984 /* In the BPABI, the DT_REL tag must point at the file
3985 offset, not the VMA, of the first relocation
3986 section. So, we use code similar to that in
3987 elflink.c, but do not check for SHF_ALLOC on the
3988 relcoation section, since relocations sections are
3989 never allocated under the BPABI. The comments above
3990 about Unixware notwithstanding, we include all of the
3991 relocations here. */
3992 if (htab
->symbian_p
)
3995 type
= ((dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3996 ? SHT_REL
: SHT_RELA
);
3998 for (i
= 1; i
< elf_numsections (output_bfd
); i
++)
4000 Elf_Internal_Shdr
*hdr
4001 = elf_elfsections (output_bfd
)[i
];
4002 if (hdr
->sh_type
== type
)
4004 if (dyn
.d_tag
== DT_RELSZ
4005 || dyn
.d_tag
== DT_RELASZ
)
4006 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4007 else if (dyn
.d_un
.d_val
== 0
4008 || hdr
->sh_offset
< dyn
.d_un
.d_val
)
4009 dyn
.d_un
.d_val
= hdr
->sh_offset
;
4012 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4016 /* Set the bottom bit of DT_INIT/FINI if the
4017 corresponding function is Thumb. */
4019 name
= info
->init_function
;
4022 name
= info
->fini_function
;
4024 /* If it wasn't set by elf_bfd_final_link
4025 then there is nothing to adjust. */
4026 if (dyn
.d_un
.d_val
!= 0)
4028 struct elf_link_hash_entry
* eh
;
4030 eh
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4031 FALSE
, FALSE
, TRUE
);
4032 if (eh
!= (struct elf_link_hash_entry
*) NULL
4033 && ELF_ST_TYPE (eh
->type
) == STT_ARM_TFUNC
)
4035 dyn
.d_un
.d_val
|= 1;
4036 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4043 /* Fill in the first entry in the procedure linkage table. */
4044 if (splt
->size
> 0 && elf32_arm_hash_table (info
)->plt_header_size
)
4046 bfd_vma got_displacement
;
4048 /* Calculate the displacement between the PLT slot and &GOT[0]. */
4049 got_displacement
= (sgot
->output_section
->vma
4050 + sgot
->output_offset
4051 - splt
->output_section
->vma
4052 - splt
->output_offset
4055 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[0], splt
->contents
+ 0);
4056 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[1], splt
->contents
+ 4);
4057 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[2], splt
->contents
+ 8);
4058 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[3], splt
->contents
+ 12);
4059 #ifdef FOUR_WORD_PLT
4060 /* The displacement value goes in the otherwise-unused last word of
4061 the second entry. */
4062 bfd_put_32 (output_bfd
, got_displacement
, splt
->contents
+ 28);
4064 bfd_put_32 (output_bfd
, got_displacement
, splt
->contents
+ 16);
4068 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4069 really seem like the right value. */
4070 elf_section_data (splt
->output_section
)->this_hdr
.sh_entsize
= 4;
4073 /* Fill in the first three entries in the global offset table. */
4079 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
);
4081 bfd_put_32 (output_bfd
,
4082 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4084 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 4);
4085 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 8);
4088 elf_section_data (sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
4095 elf32_arm_post_process_headers (bfd
* abfd
, struct bfd_link_info
* link_info ATTRIBUTE_UNUSED
)
4097 Elf_Internal_Ehdr
* i_ehdrp
; /* ELF file header, internal form. */
4098 struct elf32_arm_link_hash_table
*globals
;
4100 i_ehdrp
= elf_elfheader (abfd
);
4102 i_ehdrp
->e_ident
[EI_OSABI
] = ARM_ELF_OS_ABI_VERSION
;
4103 i_ehdrp
->e_ident
[EI_ABIVERSION
] = ARM_ELF_ABI_VERSION
;
4107 globals
= elf32_arm_hash_table (link_info
);
4108 if (globals
->byteswap_code
)
4109 i_ehdrp
->e_flags
|= EF_ARM_BE8
;
4113 static enum elf_reloc_type_class
4114 elf32_arm_reloc_type_class (const Elf_Internal_Rela
*rela
)
4116 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4118 case R_ARM_RELATIVE
:
4119 return reloc_class_relative
;
4120 case R_ARM_JUMP_SLOT
:
4121 return reloc_class_plt
;
4123 return reloc_class_copy
;
4125 return reloc_class_normal
;
4129 static bfd_boolean
elf32_arm_section_flags (flagword
*, const Elf_Internal_Shdr
*);
4130 static void elf32_arm_final_write_processing (bfd
*, bfd_boolean
);
4132 /* Set the right machine number for an Arm ELF file. */
4135 elf32_arm_section_flags (flagword
*flags
, const Elf_Internal_Shdr
*hdr
)
4137 if (hdr
->sh_type
== SHT_NOTE
)
4138 *flags
|= SEC_LINK_ONCE
| SEC_LINK_DUPLICATES_SAME_CONTENTS
;
4144 elf32_arm_final_write_processing (bfd
*abfd
, bfd_boolean linker ATTRIBUTE_UNUSED
)
4146 bfd_arm_update_notes (abfd
, ARM_NOTE_SECTION
);
4150 /* Called for each symbol. Builds a section map based on mapping symbols.
4151 Does not alter any of the symbols. */
4154 elf32_arm_output_symbol_hook (struct bfd_link_info
*info
,
4156 Elf_Internal_Sym
*elfsym
,
4157 asection
*input_sec
,
4158 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
)
4161 elf32_arm_section_map
*map
;
4162 struct elf32_arm_link_hash_table
*globals
;
4164 /* Only do this on final link. */
4165 if (info
->relocatable
)
4168 /* Only build a map if we need to byteswap code. */
4169 globals
= elf32_arm_hash_table (info
);
4170 if (!globals
->byteswap_code
)
4173 /* We only want mapping symbols. */
4174 if (! is_arm_mapping_symbol_name (name
))
4177 mapcount
= ++(elf32_arm_section_data (input_sec
)->mapcount
);
4178 map
= elf32_arm_section_data (input_sec
)->map
;
4179 /* TODO: This may be inefficient, but we probably don't usually have many
4180 mapping symbols per section. */
4181 map
= bfd_realloc (map
, mapcount
* sizeof (elf32_arm_section_map
));
4182 elf32_arm_section_data (input_sec
)->map
= map
;
4184 map
[mapcount
- 1].vma
= elfsym
->st_value
;
4185 map
[mapcount
- 1].type
= name
[1];
4190 /* Allocate target specific section data. */
4193 elf32_arm_new_section_hook (bfd
*abfd
, asection
*sec
)
4195 struct _arm_elf_section_data
*sdata
;
4196 bfd_size_type amt
= sizeof (*sdata
);
4198 sdata
= bfd_zalloc (abfd
, amt
);
4201 sec
->used_by_bfd
= sdata
;
4203 return _bfd_elf_new_section_hook (abfd
, sec
);
4207 /* Used to order a list of mapping symbols by address. */
4210 elf32_arm_compare_mapping (const void * a
, const void * b
)
4212 return ((const elf32_arm_section_map
*) a
)->vma
4213 > ((const elf32_arm_section_map
*) b
)->vma
;
4217 /* Do code byteswapping. Return FALSE afterwards so that the section is
4218 written out as normal. */
4221 elf32_arm_write_section (bfd
*output_bfd ATTRIBUTE_UNUSED
, asection
*sec
,
4225 elf32_arm_section_map
*map
;
4232 mapcount
= elf32_arm_section_data (sec
)->mapcount
;
4233 map
= elf32_arm_section_data (sec
)->map
;
4238 qsort (map
, mapcount
, sizeof (elf32_arm_section_map
),
4239 elf32_arm_compare_mapping
);
4241 offset
= sec
->output_section
->vma
+ sec
->output_offset
;
4242 ptr
= map
[0].vma
- offset
;
4243 for (i
= 0; i
< mapcount
; i
++)
4245 if (i
== mapcount
- 1)
4248 end
= map
[i
+ 1].vma
- offset
;
4250 switch (map
[i
].type
)
4253 /* Byte swap code words. */
4254 while (ptr
+ 3 < end
)
4256 tmp
= contents
[ptr
];
4257 contents
[ptr
] = contents
[ptr
+ 3];
4258 contents
[ptr
+ 3] = tmp
;
4259 tmp
= contents
[ptr
+ 1];
4260 contents
[ptr
+ 1] = contents
[ptr
+ 2];
4261 contents
[ptr
+ 2] = tmp
;
4267 /* Byte swap code halfwords. */
4268 while (ptr
+ 1 < end
)
4270 tmp
= contents
[ptr
];
4271 contents
[ptr
] = contents
[ptr
+ 1];
4272 contents
[ptr
+ 1] = tmp
;
4278 /* Leave data alone. */
4287 #define ELF_ARCH bfd_arch_arm
4288 #define ELF_MACHINE_CODE EM_ARM
4289 #ifdef __QNXTARGET__
4290 #define ELF_MAXPAGESIZE 0x1000
4292 #define ELF_MAXPAGESIZE 0x8000
4295 #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
4296 #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
4297 #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
4298 #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data
4299 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create
4300 #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
4301 #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line
4302 #define bfd_elf32_new_section_hook elf32_arm_new_section_hook
4304 #define elf_backend_get_symbol_type elf32_arm_get_symbol_type
4305 #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook
4306 #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook
4307 #define elf_backend_check_relocs elf32_arm_check_relocs
4308 #define elf_backend_relocate_section elf32_arm_relocate_section
4309 #define elf_backend_write_section elf32_arm_write_section
4310 #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol
4311 #define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections
4312 #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol
4313 #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections
4314 #define elf_backend_link_output_symbol_hook elf32_arm_output_symbol_hook
4315 #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections
4316 #define elf_backend_post_process_headers elf32_arm_post_process_headers
4317 #define elf_backend_reloc_type_class elf32_arm_reloc_type_class
4318 #define elf_backend_object_p elf32_arm_object_p
4319 #define elf_backend_section_flags elf32_arm_section_flags
4320 #define elf_backend_final_write_processing elf32_arm_final_write_processing
4321 #define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol
4323 #define elf_backend_can_refcount 1
4324 #define elf_backend_can_gc_sections 1
4325 #define elf_backend_plt_readonly 1
4326 #define elf_backend_want_got_plt 1
4327 #define elf_backend_want_plt_sym 0
4329 #define elf_backend_rela_normal 1
4332 #define elf_backend_got_header_size 12
4334 #include "elf32-target.h"