1 /* 32-bit ELF support for ARM
2 Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 typedef unsigned long int insn32
;
21 typedef unsigned short int insn16
;
23 static boolean elf32_arm_set_private_flags
24 PARAMS ((bfd
*, flagword
));
25 static boolean elf32_arm_copy_private_bfd_data
26 PARAMS ((bfd
*, bfd
*));
27 static boolean elf32_arm_merge_private_bfd_data
28 PARAMS ((bfd
*, bfd
*));
29 static boolean elf32_arm_print_private_bfd_data
30 PARAMS ((bfd
*, PTR
));
31 static int elf32_arm_get_symbol_type
32 PARAMS (( Elf_Internal_Sym
*, int));
33 static struct bfd_link_hash_table
*elf32_arm_link_hash_table_create
35 static bfd_reloc_status_type elf32_arm_final_link_relocate
36 PARAMS ((reloc_howto_type
*, bfd
*, bfd
*, asection
*, bfd_byte
*,
37 Elf_Internal_Rela
*, bfd_vma
, struct bfd_link_info
*, asection
*,
38 const char *, int, struct elf_link_hash_entry
*));
39 static insn32 insert_thumb_branch
40 PARAMS ((insn32
, int));
41 static struct elf_link_hash_entry
*find_thumb_glue
42 PARAMS ((struct bfd_link_info
*, const char *, bfd
*));
43 static struct elf_link_hash_entry
*find_arm_glue
44 PARAMS ((struct bfd_link_info
*, const char *, bfd
*));
45 static void record_arm_to_thumb_glue
46 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
47 static void record_thumb_to_arm_glue
48 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
49 static void elf32_arm_post_process_headers
50 PARAMS ((bfd
*, struct bfd_link_info
*));
51 static int elf32_arm_to_thumb_stub
52 PARAMS ((struct bfd_link_info
*, const char *, bfd
*, bfd
*, asection
*,
53 bfd_byte
*, asection
*, bfd_vma
, bfd_signed_vma
, bfd_vma
));
54 static int elf32_thumb_to_arm_stub
55 PARAMS ((struct bfd_link_info
*, const char *, bfd
*, bfd
*, asection
*,
56 bfd_byte
*, asection
*, bfd_vma
, bfd_signed_vma
, bfd_vma
));
57 static boolean elf32_arm_relocate_section
58 PARAMS ((bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
59 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**));
60 static asection
* elf32_arm_gc_mark_hook
61 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
62 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
63 static boolean elf32_arm_gc_sweep_hook
64 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
65 const Elf_Internal_Rela
*));
66 static boolean elf32_arm_check_relocs
67 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
68 const Elf_Internal_Rela
*));
69 static boolean elf32_arm_find_nearest_line
70 PARAMS ((bfd
*, asection
*, asymbol
**, bfd_vma
, const char **,
71 const char **, unsigned int *));
72 static boolean elf32_arm_adjust_dynamic_symbol
73 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
74 static boolean elf32_arm_size_dynamic_sections
75 PARAMS ((bfd
*, struct bfd_link_info
*));
76 static boolean elf32_arm_finish_dynamic_symbol
77 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
79 static boolean elf32_arm_finish_dynamic_sections
80 PARAMS ((bfd
*, struct bfd_link_info
*));
81 static struct bfd_hash_entry
* elf32_arm_link_hash_newfunc
82 PARAMS ((struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *));
84 static void arm_add_to_rel
85 PARAMS ((bfd
*, bfd_byte
*, reloc_howto_type
*, bfd_signed_vma
));
88 boolean bfd_elf32_arm_allocate_interworking_sections
89 PARAMS ((struct bfd_link_info
*));
90 boolean bfd_elf32_arm_get_bfd_for_interworking
91 PARAMS ((bfd
*, struct bfd_link_info
*));
92 boolean bfd_elf32_arm_process_before_allocation
93 PARAMS ((bfd
*, struct bfd_link_info
*, int));
94 static enum elf_reloc_type_class elf32_arm_reloc_type_class
95 PARAMS ((const Elf_Internal_Rela
*));
97 #define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK)
99 /* The linker script knows the section names for placement.
100 The entry_names are used to do simple name mangling on the stubs.
101 Given a function name, and its type, the stub can be found. The
102 name can be changed. The only requirement is the %s be present. */
103 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
104 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
106 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
107 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
109 /* The name of the dynamic interpreter. This is put in the .interp
111 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
113 /* The size in bytes of an entry in the procedure linkage table. */
114 #define PLT_ENTRY_SIZE 16
116 /* The first entry in a procedure linkage table looks like
117 this. It is set up so that any shared library function that is
118 called before the relocation has been set up calls the dynamic
120 static const bfd_vma elf32_arm_plt0_entry
[PLT_ENTRY_SIZE
/ 4] =
122 0xe52de004, /* str lr, [sp, #-4]! */
123 0xe59fe010, /* ldr lr, [pc, #16] */
124 0xe08fe00e, /* add lr, pc, lr */
125 0xe5bef008 /* ldr pc, [lr, #8]! */
128 /* Subsequent entries in a procedure linkage table look like
130 static const bfd_vma elf32_arm_plt_entry
[PLT_ENTRY_SIZE
/ 4] =
132 0xe59fc004, /* ldr ip, [pc, #4] */
133 0xe08fc00c, /* add ip, pc, ip */
134 0xe59cf000, /* ldr pc, [ip] */
135 0x00000000 /* offset to symbol in got */
138 /* The ARM linker needs to keep track of the number of relocs that it
139 decides to copy in check_relocs for each symbol. This is so that
140 it can discard PC relative relocs if it doesn't need them when
141 linking with -Bsymbolic. We store the information in a field
142 extending the regular ELF linker hash table. */
144 /* This structure keeps track of the number of PC relative relocs we
145 have copied for a given symbol. */
146 struct elf32_arm_pcrel_relocs_copied
149 struct elf32_arm_pcrel_relocs_copied
* next
;
150 /* A section in dynobj. */
152 /* Number of relocs copied in this section. */
156 /* Arm ELF linker hash entry. */
157 struct elf32_arm_link_hash_entry
159 struct elf_link_hash_entry root
;
161 /* Number of PC relative relocs copied for this symbol. */
162 struct elf32_arm_pcrel_relocs_copied
* pcrel_relocs_copied
;
165 /* Declare this now that the above structures are defined. */
166 static boolean elf32_arm_discard_copies
167 PARAMS ((struct elf32_arm_link_hash_entry
*, PTR
));
169 /* Traverse an arm ELF linker hash table. */
170 #define elf32_arm_link_hash_traverse(table, func, info) \
171 (elf_link_hash_traverse \
173 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
176 /* Get the ARM elf linker hash table from a link_info structure. */
177 #define elf32_arm_hash_table(info) \
178 ((struct elf32_arm_link_hash_table *) ((info)->hash))
180 /* ARM ELF linker hash table. */
181 struct elf32_arm_link_hash_table
183 /* The main hash table. */
184 struct elf_link_hash_table root
;
186 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
187 bfd_size_type thumb_glue_size
;
189 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
190 bfd_size_type arm_glue_size
;
192 /* An arbitary input BFD chosen to hold the glue sections. */
193 bfd
* bfd_of_glue_owner
;
195 /* A boolean indicating whether knowledge of the ARM's pipeline
196 length should be applied by the linker. */
197 int no_pipeline_knowledge
;
200 /* Create an entry in an ARM ELF linker hash table. */
202 static struct bfd_hash_entry
*
203 elf32_arm_link_hash_newfunc (entry
, table
, string
)
204 struct bfd_hash_entry
* entry
;
205 struct bfd_hash_table
* table
;
208 struct elf32_arm_link_hash_entry
* ret
=
209 (struct elf32_arm_link_hash_entry
*) entry
;
211 /* Allocate the structure if it has not already been allocated by a
213 if (ret
== (struct elf32_arm_link_hash_entry
*) NULL
)
214 ret
= ((struct elf32_arm_link_hash_entry
*)
215 bfd_hash_allocate (table
,
216 sizeof (struct elf32_arm_link_hash_entry
)));
217 if (ret
== (struct elf32_arm_link_hash_entry
*) NULL
)
218 return (struct bfd_hash_entry
*) ret
;
220 /* Call the allocation method of the superclass. */
221 ret
= ((struct elf32_arm_link_hash_entry
*)
222 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry
*) ret
,
224 if (ret
!= (struct elf32_arm_link_hash_entry
*) NULL
)
225 ret
->pcrel_relocs_copied
= NULL
;
227 return (struct bfd_hash_entry
*) ret
;
230 /* Create an ARM elf linker hash table. */
232 static struct bfd_link_hash_table
*
233 elf32_arm_link_hash_table_create (abfd
)
236 struct elf32_arm_link_hash_table
*ret
;
237 bfd_size_type amt
= sizeof (struct elf32_arm_link_hash_table
);
239 ret
= (struct elf32_arm_link_hash_table
*) bfd_alloc (abfd
, amt
);
240 if (ret
== (struct elf32_arm_link_hash_table
*) NULL
)
243 if (!_bfd_elf_link_hash_table_init (&ret
->root
, abfd
,
244 elf32_arm_link_hash_newfunc
))
246 bfd_release (abfd
, ret
);
250 ret
->thumb_glue_size
= 0;
251 ret
->arm_glue_size
= 0;
252 ret
->bfd_of_glue_owner
= NULL
;
253 ret
->no_pipeline_knowledge
= 0;
255 return &ret
->root
.root
;
258 /* Locate the Thumb encoded calling stub for NAME. */
260 static struct elf_link_hash_entry
*
261 find_thumb_glue (link_info
, name
, input_bfd
)
262 struct bfd_link_info
*link_info
;
267 struct elf_link_hash_entry
*hash
;
268 struct elf32_arm_link_hash_table
*hash_table
;
270 /* We need a pointer to the armelf specific hash table. */
271 hash_table
= elf32_arm_hash_table (link_info
);
273 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
274 + strlen (THUMB2ARM_GLUE_ENTRY_NAME
) + 1);
276 BFD_ASSERT (tmp_name
);
278 sprintf (tmp_name
, THUMB2ARM_GLUE_ENTRY_NAME
, name
);
280 hash
= elf_link_hash_lookup
281 (&(hash_table
)->root
, tmp_name
, false, false, true);
284 /* xgettext:c-format */
285 (*_bfd_error_handler
) (_("%s: unable to find THUMB glue '%s' for `%s'"),
286 bfd_archive_filename (input_bfd
), tmp_name
, name
);
293 /* Locate the ARM encoded calling stub for NAME. */
295 static struct elf_link_hash_entry
*
296 find_arm_glue (link_info
, name
, input_bfd
)
297 struct bfd_link_info
*link_info
;
302 struct elf_link_hash_entry
*myh
;
303 struct elf32_arm_link_hash_table
*hash_table
;
305 /* We need a pointer to the elfarm specific hash table. */
306 hash_table
= elf32_arm_hash_table (link_info
);
308 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
309 + strlen (ARM2THUMB_GLUE_ENTRY_NAME
) + 1);
311 BFD_ASSERT (tmp_name
);
313 sprintf (tmp_name
, ARM2THUMB_GLUE_ENTRY_NAME
, name
);
315 myh
= elf_link_hash_lookup
316 (&(hash_table
)->root
, tmp_name
, false, false, true);
319 /* xgettext:c-format */
320 (*_bfd_error_handler
) (_("%s: unable to find ARM glue '%s' for `%s'"),
321 bfd_archive_filename (input_bfd
), tmp_name
, name
);
335 .word func @ behave as if you saw a ARM_32 reloc. */
337 #define ARM2THUMB_GLUE_SIZE 12
338 static const insn32 a2t1_ldr_insn
= 0xe59fc000;
339 static const insn32 a2t2_bx_r12_insn
= 0xe12fff1c;
340 static const insn32 a2t3_func_addr_insn
= 0x00000001;
342 /* Thumb->ARM: Thumb->(non-interworking aware) ARM
346 __func_from_thumb: __func_from_thumb:
348 nop ldr r6, __func_addr
350 __func_change_to_arm: bx r6
352 __func_back_to_thumb:
358 #define THUMB2ARM_GLUE_SIZE 8
359 static const insn16 t2a1_bx_pc_insn
= 0x4778;
360 static const insn16 t2a2_noop_insn
= 0x46c0;
361 static const insn32 t2a3_b_insn
= 0xea000000;
363 static const insn16 t2a1_push_insn
= 0xb540;
364 static const insn16 t2a2_ldr_insn
= 0x4e03;
365 static const insn16 t2a3_mov_insn
= 0x46fe;
366 static const insn16 t2a4_bx_insn
= 0x4730;
367 static const insn32 t2a5_pop_insn
= 0xe8bd4040;
368 static const insn32 t2a6_bx_insn
= 0xe12fff1e;
371 bfd_elf32_arm_allocate_interworking_sections (info
)
372 struct bfd_link_info
* info
;
376 struct elf32_arm_link_hash_table
* globals
;
378 globals
= elf32_arm_hash_table (info
);
380 BFD_ASSERT (globals
!= NULL
);
382 if (globals
->arm_glue_size
!= 0)
384 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
386 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
387 ARM2THUMB_GLUE_SECTION_NAME
);
389 BFD_ASSERT (s
!= NULL
);
391 foo
= (bfd_byte
*) bfd_alloc (globals
->bfd_of_glue_owner
,
392 globals
->arm_glue_size
);
394 s
->_raw_size
= s
->_cooked_size
= globals
->arm_glue_size
;
398 if (globals
->thumb_glue_size
!= 0)
400 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
402 s
= bfd_get_section_by_name
403 (globals
->bfd_of_glue_owner
, THUMB2ARM_GLUE_SECTION_NAME
);
405 BFD_ASSERT (s
!= NULL
);
407 foo
= (bfd_byte
*) bfd_alloc (globals
->bfd_of_glue_owner
,
408 globals
->thumb_glue_size
);
410 s
->_raw_size
= s
->_cooked_size
= globals
->thumb_glue_size
;
418 record_arm_to_thumb_glue (link_info
, h
)
419 struct bfd_link_info
* link_info
;
420 struct elf_link_hash_entry
* h
;
422 const char * name
= h
->root
.root
.string
;
425 struct elf_link_hash_entry
* myh
;
426 struct elf32_arm_link_hash_table
* globals
;
429 globals
= elf32_arm_hash_table (link_info
);
431 BFD_ASSERT (globals
!= NULL
);
432 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
434 s
= bfd_get_section_by_name
435 (globals
->bfd_of_glue_owner
, ARM2THUMB_GLUE_SECTION_NAME
);
437 BFD_ASSERT (s
!= NULL
);
439 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
440 + strlen (ARM2THUMB_GLUE_ENTRY_NAME
) + 1);
442 BFD_ASSERT (tmp_name
);
444 sprintf (tmp_name
, ARM2THUMB_GLUE_ENTRY_NAME
, name
);
446 myh
= elf_link_hash_lookup
447 (&(globals
)->root
, tmp_name
, false, false, true);
451 /* We've already seen this guy. */
456 /* The only trick here is using hash_table->arm_glue_size as the value. Even
457 though the section isn't allocated yet, this is where we will be putting
459 val
= globals
->arm_glue_size
+ 1;
460 _bfd_generic_link_add_one_symbol (link_info
, globals
->bfd_of_glue_owner
,
461 tmp_name
, BSF_GLOBAL
, s
, val
,
463 (struct bfd_link_hash_entry
**) &myh
);
467 globals
->arm_glue_size
+= ARM2THUMB_GLUE_SIZE
;
473 record_thumb_to_arm_glue (link_info
, h
)
474 struct bfd_link_info
*link_info
;
475 struct elf_link_hash_entry
*h
;
477 const char *name
= h
->root
.root
.string
;
480 struct elf_link_hash_entry
*myh
;
481 struct elf32_arm_link_hash_table
*hash_table
;
485 hash_table
= elf32_arm_hash_table (link_info
);
487 BFD_ASSERT (hash_table
!= NULL
);
488 BFD_ASSERT (hash_table
->bfd_of_glue_owner
!= NULL
);
490 s
= bfd_get_section_by_name
491 (hash_table
->bfd_of_glue_owner
, THUMB2ARM_GLUE_SECTION_NAME
);
493 BFD_ASSERT (s
!= NULL
);
495 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
496 + strlen (THUMB2ARM_GLUE_ENTRY_NAME
) + 1);
498 BFD_ASSERT (tmp_name
);
500 sprintf (tmp_name
, THUMB2ARM_GLUE_ENTRY_NAME
, name
);
502 myh
= elf_link_hash_lookup
503 (&(hash_table
)->root
, tmp_name
, false, false, true);
507 /* We've already seen this guy. */
512 val
= hash_table
->thumb_glue_size
+ 1;
513 _bfd_generic_link_add_one_symbol (link_info
, hash_table
->bfd_of_glue_owner
,
514 tmp_name
, BSF_GLOBAL
, s
, val
,
516 (struct bfd_link_hash_entry
**) &myh
);
518 /* If we mark it 'Thumb', the disassembler will do a better job. */
519 bind
= ELF_ST_BIND (myh
->type
);
520 myh
->type
= ELF_ST_INFO (bind
, STT_ARM_TFUNC
);
524 #define CHANGE_TO_ARM "__%s_change_to_arm"
525 #define BACK_FROM_ARM "__%s_back_from_arm"
527 /* Allocate another symbol to mark where we switch to Arm mode. */
528 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
529 + strlen (CHANGE_TO_ARM
) + 1);
531 BFD_ASSERT (tmp_name
);
533 sprintf (tmp_name
, CHANGE_TO_ARM
, name
);
537 val
= hash_table
->thumb_glue_size
+ 4,
538 _bfd_generic_link_add_one_symbol (link_info
, hash_table
->bfd_of_glue_owner
,
539 tmp_name
, BSF_LOCAL
, s
, val
,
541 (struct bfd_link_hash_entry
**) &myh
);
545 hash_table
->thumb_glue_size
+= THUMB2ARM_GLUE_SIZE
;
550 /* Select a BFD to be used to hold the sections used by the glue code.
551 This function is called from the linker scripts in ld/emultempl/
555 bfd_elf32_arm_get_bfd_for_interworking (abfd
, info
)
557 struct bfd_link_info
*info
;
559 struct elf32_arm_link_hash_table
*globals
;
563 /* If we are only performing a partial link do not bother
564 getting a bfd to hold the glue. */
565 if (info
->relocateable
)
568 globals
= elf32_arm_hash_table (info
);
570 BFD_ASSERT (globals
!= NULL
);
572 if (globals
->bfd_of_glue_owner
!= NULL
)
575 sec
= bfd_get_section_by_name (abfd
, ARM2THUMB_GLUE_SECTION_NAME
);
579 /* Note: we do not include the flag SEC_LINKER_CREATED, as this
580 will prevent elf_link_input_bfd() from processing the contents
582 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_CODE
| SEC_READONLY
;
584 sec
= bfd_make_section (abfd
, ARM2THUMB_GLUE_SECTION_NAME
);
587 || !bfd_set_section_flags (abfd
, sec
, flags
)
588 || !bfd_set_section_alignment (abfd
, sec
, 2))
591 /* Set the gc mark to prevent the section from being removed by garbage
592 collection, despite the fact that no relocs refer to this section. */
596 sec
= bfd_get_section_by_name (abfd
, THUMB2ARM_GLUE_SECTION_NAME
);
600 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_CODE
| SEC_READONLY
;
602 sec
= bfd_make_section (abfd
, THUMB2ARM_GLUE_SECTION_NAME
);
605 || !bfd_set_section_flags (abfd
, sec
, flags
)
606 || !bfd_set_section_alignment (abfd
, sec
, 2))
612 /* Save the bfd for later use. */
613 globals
->bfd_of_glue_owner
= abfd
;
619 bfd_elf32_arm_process_before_allocation (abfd
, link_info
, no_pipeline_knowledge
)
621 struct bfd_link_info
*link_info
;
622 int no_pipeline_knowledge
;
624 Elf_Internal_Shdr
*symtab_hdr
;
625 Elf_Internal_Rela
*free_relocs
= NULL
;
626 Elf_Internal_Rela
*irel
, *irelend
;
627 bfd_byte
*contents
= NULL
;
628 bfd_byte
*free_contents
= NULL
;
629 Elf32_External_Sym
*extsyms
= NULL
;
630 Elf32_External_Sym
*free_extsyms
= NULL
;
633 struct elf32_arm_link_hash_table
*globals
;
635 /* If we are only performing a partial link do not bother
636 to construct any glue. */
637 if (link_info
->relocateable
)
640 /* Here we have a bfd that is to be included on the link. We have a hook
641 to do reloc rummaging, before section sizes are nailed down. */
642 globals
= elf32_arm_hash_table (link_info
);
644 BFD_ASSERT (globals
!= NULL
);
645 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
647 globals
->no_pipeline_knowledge
= no_pipeline_knowledge
;
649 /* Rummage around all the relocs and map the glue vectors. */
650 sec
= abfd
->sections
;
655 for (; sec
!= NULL
; sec
= sec
->next
)
657 if (sec
->reloc_count
== 0)
660 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
662 /* Load the relocs. */
663 irel
= (_bfd_elf32_link_read_relocs (abfd
, sec
, (PTR
) NULL
,
664 (Elf_Internal_Rela
*) NULL
, false));
666 BFD_ASSERT (irel
!= 0);
668 irelend
= irel
+ sec
->reloc_count
;
669 for (; irel
< irelend
; irel
++)
672 unsigned long r_index
;
674 struct elf_link_hash_entry
*h
;
676 r_type
= ELF32_R_TYPE (irel
->r_info
);
677 r_index
= ELF32_R_SYM (irel
->r_info
);
679 /* These are the only relocation types we care about. */
680 if ( r_type
!= R_ARM_PC24
681 && r_type
!= R_ARM_THM_PC22
)
684 /* Get the section contents if we haven't done so already. */
685 if (contents
== NULL
)
687 /* Get cached copy if it exists. */
688 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
689 contents
= elf_section_data (sec
)->this_hdr
.contents
;
692 /* Go get them off disk. */
693 contents
= (bfd_byte
*) bfd_malloc (sec
->_raw_size
);
694 if (contents
== NULL
)
697 free_contents
= contents
;
699 if (!bfd_get_section_contents (abfd
, sec
, contents
,
700 (file_ptr
) 0, sec
->_raw_size
))
705 /* Read this BFD's symbols if we haven't done so already. */
708 /* Get cached copy if it exists. */
709 if (symtab_hdr
->contents
!= NULL
)
710 extsyms
= (Elf32_External_Sym
*) symtab_hdr
->contents
;
713 /* Go get them off disk. */
714 extsyms
= ((Elf32_External_Sym
*)
715 bfd_malloc (symtab_hdr
->sh_size
));
719 free_extsyms
= extsyms
;
721 if (bfd_seek (abfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
722 || (bfd_bread (extsyms
, symtab_hdr
->sh_size
, abfd
)
723 != symtab_hdr
->sh_size
))
728 /* If the relocation is not against a symbol it cannot concern us. */
731 /* We don't care about local symbols. */
732 if (r_index
< symtab_hdr
->sh_info
)
735 /* This is an external symbol. */
736 r_index
-= symtab_hdr
->sh_info
;
737 h
= (struct elf_link_hash_entry
*)
738 elf_sym_hashes (abfd
)[r_index
];
740 /* If the relocation is against a static symbol it must be within
741 the current section and so cannot be a cross ARM/Thumb relocation. */
748 /* This one is a call from arm code. We need to look up
749 the target of the call. If it is a thumb target, we
751 if (ELF_ST_TYPE(h
->type
) == STT_ARM_TFUNC
)
752 record_arm_to_thumb_glue (link_info
, h
);
756 /* This one is a call from thumb code. We look
757 up the target of the call. If it is not a thumb
758 target, we insert glue. */
759 if (ELF_ST_TYPE (h
->type
) != STT_ARM_TFUNC
)
760 record_thumb_to_arm_glue (link_info
, h
);
772 if (free_relocs
!= NULL
)
774 if (free_contents
!= NULL
)
775 free (free_contents
);
776 if (free_extsyms
!= NULL
)
782 /* The thumb form of a long branch is a bit finicky, because the offset
783 encoding is split over two fields, each in it's own instruction. They
784 can occur in any order. So given a thumb form of long branch, and an
785 offset, insert the offset into the thumb branch and return finished
788 It takes two thumb instructions to encode the target address. Each has
789 11 bits to invest. The upper 11 bits are stored in one (identifed by
790 H-0.. see below), the lower 11 bits are stored in the other (identified
793 Combine together and shifted left by 1 (it's a half word address) and
797 H-0, upper address-0 = 000
799 H-1, lower address-0 = 800
801 They can be ordered either way, but the arm tools I've seen always put
802 the lower one first. It probably doesn't matter. krk@cygnus.com
804 XXX: Actually the order does matter. The second instruction (H-1)
805 moves the computed address into the PC, so it must be the second one
806 in the sequence. The problem, however is that whilst little endian code
807 stores the instructions in HI then LOW order, big endian code does the
808 reverse. nickc@cygnus.com. */
810 #define LOW_HI_ORDER 0xF800F000
811 #define HI_LOW_ORDER 0xF000F800
814 insert_thumb_branch (br_insn
, rel_off
)
818 unsigned int low_bits
;
819 unsigned int high_bits
;
821 BFD_ASSERT ((rel_off
& 1) != 1);
823 rel_off
>>= 1; /* Half word aligned address. */
824 low_bits
= rel_off
& 0x000007FF; /* The bottom 11 bits. */
825 high_bits
= (rel_off
>> 11) & 0x000007FF; /* The top 11 bits. */
827 if ((br_insn
& LOW_HI_ORDER
) == LOW_HI_ORDER
)
828 br_insn
= LOW_HI_ORDER
| (low_bits
<< 16) | high_bits
;
829 else if ((br_insn
& HI_LOW_ORDER
) == HI_LOW_ORDER
)
830 br_insn
= HI_LOW_ORDER
| (high_bits
<< 16) | low_bits
;
832 /* FIXME: abort is probably not the right call. krk@cygnus.com */
833 abort (); /* error - not a valid branch instruction form. */
838 /* Thumb code calling an ARM function. */
841 elf32_thumb_to_arm_stub (info
, name
, input_bfd
, output_bfd
, input_section
,
842 hit_data
, sym_sec
, offset
, addend
, val
)
843 struct bfd_link_info
* info
;
847 asection
* input_section
;
851 bfd_signed_vma addend
;
856 unsigned long int tmp
;
858 struct elf_link_hash_entry
* myh
;
859 struct elf32_arm_link_hash_table
* globals
;
861 myh
= find_thumb_glue (info
, name
, input_bfd
);
865 globals
= elf32_arm_hash_table (info
);
867 BFD_ASSERT (globals
!= NULL
);
868 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
870 my_offset
= myh
->root
.u
.def
.value
;
872 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
873 THUMB2ARM_GLUE_SECTION_NAME
);
875 BFD_ASSERT (s
!= NULL
);
876 BFD_ASSERT (s
->contents
!= NULL
);
877 BFD_ASSERT (s
->output_section
!= NULL
);
879 if ((my_offset
& 0x01) == 0x01)
882 && sym_sec
->owner
!= NULL
883 && !INTERWORK_FLAG (sym_sec
->owner
))
885 (*_bfd_error_handler
)
886 (_("%s(%s): warning: interworking not enabled."),
887 bfd_archive_filename (sym_sec
->owner
), name
);
888 (*_bfd_error_handler
)
889 (_(" first occurrence: %s: thumb call to arm"),
890 bfd_archive_filename (input_bfd
));
896 myh
->root
.u
.def
.value
= my_offset
;
898 bfd_put_16 (output_bfd
, (bfd_vma
) t2a1_bx_pc_insn
,
899 s
->contents
+ my_offset
);
901 bfd_put_16 (output_bfd
, (bfd_vma
) t2a2_noop_insn
,
902 s
->contents
+ my_offset
+ 2);
905 /* Address of destination of the stub. */
906 ((bfd_signed_vma
) val
)
908 /* Offset from the start of the current section to the start of the stubs. */
910 /* Offset of the start of this stub from the start of the stubs. */
912 /* Address of the start of the current section. */
913 + s
->output_section
->vma
)
914 /* The branch instruction is 4 bytes into the stub. */
916 /* ARM branches work from the pc of the instruction + 8. */
919 bfd_put_32 (output_bfd
,
920 (bfd_vma
) t2a3_b_insn
| ((ret_offset
>> 2) & 0x00FFFFFF),
921 s
->contents
+ my_offset
+ 4);
924 BFD_ASSERT (my_offset
<= globals
->thumb_glue_size
);
926 /* Now go back and fix up the original BL insn to point
928 ret_offset
= (s
->output_offset
930 - (input_section
->output_offset
934 tmp
= bfd_get_32 (input_bfd
, hit_data
935 - input_section
->vma
);
937 bfd_put_32 (output_bfd
,
938 (bfd_vma
) insert_thumb_branch (tmp
, ret_offset
),
939 hit_data
- input_section
->vma
);
944 /* Arm code calling a Thumb function. */
947 elf32_arm_to_thumb_stub (info
, name
, input_bfd
, output_bfd
, input_section
,
948 hit_data
, sym_sec
, offset
, addend
, val
)
949 struct bfd_link_info
* info
;
953 asection
* input_section
;
957 bfd_signed_vma addend
;
960 unsigned long int tmp
;
964 struct elf_link_hash_entry
* myh
;
965 struct elf32_arm_link_hash_table
* globals
;
967 myh
= find_arm_glue (info
, name
, input_bfd
);
971 globals
= elf32_arm_hash_table (info
);
973 BFD_ASSERT (globals
!= NULL
);
974 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
976 my_offset
= myh
->root
.u
.def
.value
;
977 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
978 ARM2THUMB_GLUE_SECTION_NAME
);
979 BFD_ASSERT (s
!= NULL
);
980 BFD_ASSERT (s
->contents
!= NULL
);
981 BFD_ASSERT (s
->output_section
!= NULL
);
983 if ((my_offset
& 0x01) == 0x01)
986 && sym_sec
->owner
!= NULL
987 && !INTERWORK_FLAG (sym_sec
->owner
))
989 (*_bfd_error_handler
)
990 (_("%s(%s): warning: interworking not enabled."),
991 bfd_archive_filename (sym_sec
->owner
), name
);
992 (*_bfd_error_handler
)
993 (_(" first occurrence: %s: arm call to thumb"),
994 bfd_archive_filename (input_bfd
));
998 myh
->root
.u
.def
.value
= my_offset
;
1000 bfd_put_32 (output_bfd
, (bfd_vma
) a2t1_ldr_insn
,
1001 s
->contents
+ my_offset
);
1003 bfd_put_32 (output_bfd
, (bfd_vma
) a2t2_bx_r12_insn
,
1004 s
->contents
+ my_offset
+ 4);
1006 /* It's a thumb address. Add the low order bit. */
1007 bfd_put_32 (output_bfd
, val
| a2t3_func_addr_insn
,
1008 s
->contents
+ my_offset
+ 8);
1011 BFD_ASSERT (my_offset
<= globals
->arm_glue_size
);
1013 tmp
= bfd_get_32 (input_bfd
, hit_data
);
1014 tmp
= tmp
& 0xFF000000;
1016 /* Somehow these are both 4 too far, so subtract 8. */
1017 ret_offset
= (s
->output_offset
1019 + s
->output_section
->vma
1020 - (input_section
->output_offset
1021 + input_section
->output_section
->vma
1025 tmp
= tmp
| ((ret_offset
>> 2) & 0x00FFFFFF);
1027 bfd_put_32 (output_bfd
, (bfd_vma
) tmp
, hit_data
- input_section
->vma
);
1032 /* Perform a relocation as part of a final link. */
1034 static bfd_reloc_status_type
1035 elf32_arm_final_link_relocate (howto
, input_bfd
, output_bfd
,
1036 input_section
, contents
, rel
, value
,
1037 info
, sym_sec
, sym_name
, sym_flags
, h
)
1038 reloc_howto_type
* howto
;
1041 asection
* input_section
;
1042 bfd_byte
* contents
;
1043 Elf_Internal_Rela
* rel
;
1045 struct bfd_link_info
* info
;
1047 const char * sym_name
;
1049 struct elf_link_hash_entry
* h
;
1051 unsigned long r_type
= howto
->type
;
1052 unsigned long r_symndx
;
1053 bfd_byte
* hit_data
= contents
+ rel
->r_offset
;
1054 bfd
* dynobj
= NULL
;
1055 Elf_Internal_Shdr
* symtab_hdr
;
1056 struct elf_link_hash_entry
** sym_hashes
;
1057 bfd_vma
* local_got_offsets
;
1058 asection
* sgot
= NULL
;
1059 asection
* splt
= NULL
;
1060 asection
* sreloc
= NULL
;
1062 bfd_signed_vma signed_addend
;
1063 struct elf32_arm_link_hash_table
* globals
;
1065 /* If the start address has been set, then set the EF_ARM_HASENTRY
1066 flag. Setting this more than once is redundant, but the cost is
1067 not too high, and it keeps the code simple.
1069 The test is done here, rather than somewhere else, because the
1070 start address is only set just before the final link commences.
1072 Note - if the user deliberately sets a start address of 0, the
1073 flag will not be set. */
1074 if (bfd_get_start_address (output_bfd
) != 0)
1075 elf_elfheader (output_bfd
)->e_flags
|= EF_ARM_HASENTRY
;
1077 globals
= elf32_arm_hash_table (info
);
1079 dynobj
= elf_hash_table (info
)->dynobj
;
1082 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1083 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1085 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1086 sym_hashes
= elf_sym_hashes (input_bfd
);
1087 local_got_offsets
= elf_local_got_offsets (input_bfd
);
1088 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1091 addend
= bfd_get_32 (input_bfd
, hit_data
) & howto
->src_mask
;
1093 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1096 signed_addend
&= ~ howto
->src_mask
;
1097 signed_addend
|= addend
;
1100 signed_addend
= addend
;
1102 addend
= signed_addend
= rel
->r_addend
;
1108 return bfd_reloc_ok
;
1116 /* When generating a shared object, these relocations are copied
1117 into the output file to be resolved at run time. */
1120 && (r_type
!= R_ARM_PC24
1123 && (! info
->symbolic
1124 || (h
->elf_link_hash_flags
1125 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
1127 Elf_Internal_Rel outrel
;
1128 boolean skip
, relocate
;
1134 name
= (bfd_elf_string_from_elf_section
1136 elf_elfheader (input_bfd
)->e_shstrndx
,
1137 elf_section_data (input_section
)->rel_hdr
.sh_name
));
1139 return bfd_reloc_notsupported
;
1141 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
1142 && strcmp (bfd_get_section_name (input_bfd
,
1146 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1147 BFD_ASSERT (sreloc
!= NULL
);
1152 if (elf_section_data (input_section
)->stab_info
== NULL
)
1153 outrel
.r_offset
= rel
->r_offset
;
1158 off
= (_bfd_stab_section_offset
1159 (output_bfd
, &elf_hash_table (info
)->stab_info
,
1161 & elf_section_data (input_section
)->stab_info
,
1163 if (off
== (bfd_vma
) -1)
1165 outrel
.r_offset
= off
;
1168 outrel
.r_offset
+= (input_section
->output_section
->vma
1169 + input_section
->output_offset
);
1173 memset (&outrel
, 0, sizeof outrel
);
1176 else if (r_type
== R_ARM_PC24
)
1178 BFD_ASSERT (h
!= NULL
&& h
->dynindx
!= -1);
1179 if ((input_section
->flags
& SEC_ALLOC
) != 0)
1183 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_PC24
);
1188 || ((info
->symbolic
|| h
->dynindx
== -1)
1189 && (h
->elf_link_hash_flags
1190 & ELF_LINK_HASH_DEF_REGULAR
) != 0))
1193 outrel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
1197 BFD_ASSERT (h
->dynindx
!= -1);
1198 if ((input_section
->flags
& SEC_ALLOC
) != 0)
1202 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_ABS32
);
1206 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
,
1207 (((Elf32_External_Rel
*)
1209 + sreloc
->reloc_count
));
1210 ++sreloc
->reloc_count
;
1212 /* If this reloc is against an external symbol, we do not want to
1213 fiddle with the addend. Otherwise, we need to include the symbol
1214 value so that it becomes an addend for the dynamic reloc. */
1216 return bfd_reloc_ok
;
1218 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1219 contents
, rel
->r_offset
, value
,
1222 else switch (r_type
)
1225 case R_ARM_XPC25
: /* Arm BLX instruction. */
1227 case R_ARM_PC24
: /* Arm B/BL instruction */
1229 if (r_type
== R_ARM_XPC25
)
1231 /* Check for Arm calling Arm function. */
1232 /* FIXME: Should we translate the instruction into a BL
1233 instruction instead ? */
1234 if (sym_flags
!= STT_ARM_TFUNC
)
1235 (*_bfd_error_handler
) (_("\
1236 %s: Warning: Arm BLX instruction targets Arm function '%s'."),
1237 bfd_archive_filename (input_bfd
),
1238 h
? h
->root
.root
.string
: "(local)");
1243 /* Check for Arm calling Thumb function. */
1244 if (sym_flags
== STT_ARM_TFUNC
)
1246 elf32_arm_to_thumb_stub (info
, sym_name
, input_bfd
, output_bfd
,
1247 input_section
, hit_data
, sym_sec
, rel
->r_offset
,
1248 signed_addend
, value
);
1249 return bfd_reloc_ok
;
1253 if ( strcmp (bfd_get_target (input_bfd
), "elf32-littlearm-oabi") == 0
1254 || strcmp (bfd_get_target (input_bfd
), "elf32-bigarm-oabi") == 0)
1256 /* The old way of doing things. Trearing the addend as a
1257 byte sized field and adding in the pipeline offset. */
1258 value
-= (input_section
->output_section
->vma
1259 + input_section
->output_offset
);
1260 value
-= rel
->r_offset
;
1263 if (! globals
->no_pipeline_knowledge
)
1268 /* The ARM ELF ABI says that this reloc is computed as: S - P + A
1270 S is the address of the symbol in the relocation.
1271 P is address of the instruction being relocated.
1272 A is the addend (extracted from the instruction) in bytes.
1274 S is held in 'value'.
1275 P is the base address of the section containing the instruction
1276 plus the offset of the reloc into that section, ie:
1277 (input_section->output_section->vma +
1278 input_section->output_offset +
1280 A is the addend, converted into bytes, ie:
1283 Note: None of these operations have knowledge of the pipeline
1284 size of the processor, thus it is up to the assembler to encode
1285 this information into the addend. */
1286 value
-= (input_section
->output_section
->vma
1287 + input_section
->output_offset
);
1288 value
-= rel
->r_offset
;
1289 value
+= (signed_addend
<< howto
->size
);
1291 /* Previous versions of this code also used to add in the pipeline
1292 offset here. This is wrong because the linker is not supposed
1293 to know about such things, and one day it might change. In order
1294 to support old binaries that need the old behaviour however, so
1295 we attempt to detect which ABI was used to create the reloc. */
1296 if (! globals
->no_pipeline_knowledge
)
1298 Elf_Internal_Ehdr
* i_ehdrp
; /* Elf file header, internal form */
1300 i_ehdrp
= elf_elfheader (input_bfd
);
1302 if (i_ehdrp
->e_ident
[EI_OSABI
] == 0)
1307 signed_addend
= value
;
1308 signed_addend
>>= howto
->rightshift
;
1310 /* It is not an error for an undefined weak reference to be
1311 out of range. Any program that branches to such a symbol
1312 is going to crash anyway, so there is no point worrying
1313 about getting the destination exactly right. */
1314 if (! h
|| h
->root
.type
!= bfd_link_hash_undefweak
)
1316 /* Perform a signed range check. */
1317 if ( signed_addend
> ((bfd_signed_vma
) (howto
->dst_mask
>> 1))
1318 || signed_addend
< - ((bfd_signed_vma
) ((howto
->dst_mask
+ 1) >> 1)))
1319 return bfd_reloc_overflow
;
1323 /* If necessary set the H bit in the BLX instruction. */
1324 if (r_type
== R_ARM_XPC25
&& ((value
& 2) == 2))
1325 value
= (signed_addend
& howto
->dst_mask
)
1326 | (bfd_get_32 (input_bfd
, hit_data
) & (~ howto
->dst_mask
))
1330 value
= (signed_addend
& howto
->dst_mask
)
1331 | (bfd_get_32 (input_bfd
, hit_data
) & (~ howto
->dst_mask
));
1336 if (sym_flags
== STT_ARM_TFUNC
)
1341 value
-= (input_section
->output_section
->vma
1342 + input_section
->output_offset
+ rel
->r_offset
);
1347 bfd_put_32 (input_bfd
, value
, hit_data
);
1348 return bfd_reloc_ok
;
1352 if ((long) value
> 0x7f || (long) value
< -0x80)
1353 return bfd_reloc_overflow
;
1355 bfd_put_8 (input_bfd
, value
, hit_data
);
1356 return bfd_reloc_ok
;
1361 if ((long) value
> 0x7fff || (long) value
< -0x8000)
1362 return bfd_reloc_overflow
;
1364 bfd_put_16 (input_bfd
, value
, hit_data
);
1365 return bfd_reloc_ok
;
1368 /* Support ldr and str instruction for the arm */
1369 /* Also thumb b (unconditional branch). ??? Really? */
1372 if ((long) value
> 0x7ff || (long) value
< -0x800)
1373 return bfd_reloc_overflow
;
1375 value
|= (bfd_get_32 (input_bfd
, hit_data
) & 0xfffff000);
1376 bfd_put_32 (input_bfd
, value
, hit_data
);
1377 return bfd_reloc_ok
;
1379 case R_ARM_THM_ABS5
:
1380 /* Support ldr and str instructions for the thumb. */
1382 /* Need to refetch addend. */
1383 addend
= bfd_get_16 (input_bfd
, hit_data
) & howto
->src_mask
;
1384 /* ??? Need to determine shift amount from operand size. */
1385 addend
>>= howto
->rightshift
;
1389 /* ??? Isn't value unsigned? */
1390 if ((long) value
> 0x1f || (long) value
< -0x10)
1391 return bfd_reloc_overflow
;
1393 /* ??? Value needs to be properly shifted into place first. */
1394 value
|= bfd_get_16 (input_bfd
, hit_data
) & 0xf83f;
1395 bfd_put_16 (input_bfd
, value
, hit_data
);
1396 return bfd_reloc_ok
;
1399 case R_ARM_THM_XPC22
:
1401 case R_ARM_THM_PC22
:
1402 /* Thumb BL (branch long instruction). */
1405 boolean overflow
= false;
1406 bfd_vma upper_insn
= bfd_get_16 (input_bfd
, hit_data
);
1407 bfd_vma lower_insn
= bfd_get_16 (input_bfd
, hit_data
+ 2);
1408 bfd_signed_vma reloc_signed_max
= (1 << (howto
->bitsize
- 1)) - 1;
1409 bfd_signed_vma reloc_signed_min
= ~ reloc_signed_max
;
1411 bfd_signed_vma signed_check
;
1414 /* Need to refetch the addend and squish the two 11 bit pieces
1417 bfd_vma upper
= upper_insn
& 0x7ff;
1418 bfd_vma lower
= lower_insn
& 0x7ff;
1419 upper
= (upper
^ 0x400) - 0x400; /* Sign extend. */
1420 addend
= (upper
<< 12) | (lower
<< 1);
1421 signed_addend
= addend
;
1425 if (r_type
== R_ARM_THM_XPC22
)
1427 /* Check for Thumb to Thumb call. */
1428 /* FIXME: Should we translate the instruction into a BL
1429 instruction instead ? */
1430 if (sym_flags
== STT_ARM_TFUNC
)
1431 (*_bfd_error_handler
) (_("\
1432 %s: Warning: Thumb BLX instruction targets thumb function '%s'."),
1433 bfd_archive_filename (input_bfd
),
1434 h
? h
->root
.root
.string
: "(local)");
1439 /* If it is not a call to Thumb, assume call to Arm.
1440 If it is a call relative to a section name, then it is not a
1441 function call at all, but rather a long jump. */
1442 if (sym_flags
!= STT_ARM_TFUNC
&& sym_flags
!= STT_SECTION
)
1444 if (elf32_thumb_to_arm_stub
1445 (info
, sym_name
, input_bfd
, output_bfd
, input_section
,
1446 hit_data
, sym_sec
, rel
->r_offset
, signed_addend
, value
))
1447 return bfd_reloc_ok
;
1449 return bfd_reloc_dangerous
;
1453 relocation
= value
+ signed_addend
;
1455 relocation
-= (input_section
->output_section
->vma
1456 + input_section
->output_offset
1459 if (! globals
->no_pipeline_knowledge
)
1461 Elf_Internal_Ehdr
* i_ehdrp
; /* Elf file header, internal form. */
1463 i_ehdrp
= elf_elfheader (input_bfd
);
1465 /* Previous versions of this code also used to add in the pipline
1466 offset here. This is wrong because the linker is not supposed
1467 to know about such things, and one day it might change. In order
1468 to support old binaries that need the old behaviour however, so
1469 we attempt to detect which ABI was used to create the reloc. */
1470 if ( strcmp (bfd_get_target (input_bfd
), "elf32-littlearm-oabi") == 0
1471 || strcmp (bfd_get_target (input_bfd
), "elf32-bigarm-oabi") == 0
1472 || i_ehdrp
->e_ident
[EI_OSABI
] == 0)
1476 check
= relocation
>> howto
->rightshift
;
1478 /* If this is a signed value, the rightshift just dropped
1479 leading 1 bits (assuming twos complement). */
1480 if ((bfd_signed_vma
) relocation
>= 0)
1481 signed_check
= check
;
1483 signed_check
= check
| ~((bfd_vma
) -1 >> howto
->rightshift
);
1485 /* Assumes two's complement. */
1486 if (signed_check
> reloc_signed_max
|| signed_check
< reloc_signed_min
)
1489 /* Put RELOCATION back into the insn. */
1490 upper_insn
= (upper_insn
& ~(bfd_vma
) 0x7ff) | ((relocation
>> 12) & 0x7ff);
1491 lower_insn
= (lower_insn
& ~(bfd_vma
) 0x7ff) | ((relocation
>> 1) & 0x7ff);
1494 if (r_type
== R_ARM_THM_XPC22
1495 && ((lower_insn
& 0x1800) == 0x0800))
1496 /* Remove bit zero of the adjusted offset. Bit zero can only be
1497 set if the upper insn is at a half-word boundary, since the
1498 destination address, an ARM instruction, must always be on a
1499 word boundary. The semantics of the BLX (1) instruction, however,
1500 are that bit zero in the offset must always be zero, and the
1501 corresponding bit one in the target address will be set from bit
1502 one of the source address. */
1505 /* Put the relocated value back in the object file: */
1506 bfd_put_16 (input_bfd
, upper_insn
, hit_data
);
1507 bfd_put_16 (input_bfd
, lower_insn
, hit_data
+ 2);
1509 return (overflow
? bfd_reloc_overflow
: bfd_reloc_ok
);
1513 case R_ARM_GNU_VTINHERIT
:
1514 case R_ARM_GNU_VTENTRY
:
1515 return bfd_reloc_ok
;
1518 return bfd_reloc_notsupported
;
1520 case R_ARM_GLOB_DAT
:
1521 return bfd_reloc_notsupported
;
1523 case R_ARM_JUMP_SLOT
:
1524 return bfd_reloc_notsupported
;
1526 case R_ARM_RELATIVE
:
1527 return bfd_reloc_notsupported
;
1530 /* Relocation is relative to the start of the
1531 global offset table. */
1533 BFD_ASSERT (sgot
!= NULL
);
1535 return bfd_reloc_notsupported
;
1537 /* Note that sgot->output_offset is not involved in this
1538 calculation. We always want the start of .got. If we
1539 define _GLOBAL_OFFSET_TABLE in a different way, as is
1540 permitted by the ABI, we might have to change this
1542 value
-= sgot
->output_section
->vma
;
1543 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1544 contents
, rel
->r_offset
, value
,
1548 /* Use global offset table as symbol value. */
1549 BFD_ASSERT (sgot
!= NULL
);
1552 return bfd_reloc_notsupported
;
1554 value
= sgot
->output_section
->vma
;
1555 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1556 contents
, rel
->r_offset
, value
,
1560 /* Relocation is to the entry for this symbol in the
1561 global offset table. */
1563 return bfd_reloc_notsupported
;
1569 off
= h
->got
.offset
;
1570 BFD_ASSERT (off
!= (bfd_vma
) -1);
1572 if (!elf_hash_table (info
)->dynamic_sections_created
||
1573 (info
->shared
&& (info
->symbolic
|| h
->dynindx
== -1)
1574 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
1576 /* This is actually a static link, or it is a -Bsymbolic link
1577 and the symbol is defined locally. We must initialize this
1578 entry in the global offset table. Since the offset must
1579 always be a multiple of 4, we use the least significant bit
1580 to record whether we have initialized it already.
1582 When doing a dynamic link, we create a .rel.got relocation
1583 entry to initialize the value. This is done in the
1584 finish_dynamic_symbol routine. */
1589 bfd_put_32 (output_bfd
, value
, sgot
->contents
+ off
);
1594 value
= sgot
->output_offset
+ off
;
1600 BFD_ASSERT (local_got_offsets
!= NULL
&&
1601 local_got_offsets
[r_symndx
] != (bfd_vma
) -1);
1603 off
= local_got_offsets
[r_symndx
];
1605 /* The offset must always be a multiple of 4. We use the
1606 least significant bit to record whether we have already
1607 generated the necessary reloc. */
1612 bfd_put_32 (output_bfd
, value
, sgot
->contents
+ off
);
1617 Elf_Internal_Rel outrel
;
1619 srelgot
= bfd_get_section_by_name (dynobj
, ".rel.got");
1620 BFD_ASSERT (srelgot
!= NULL
);
1622 outrel
.r_offset
= (sgot
->output_section
->vma
1623 + sgot
->output_offset
1625 outrel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
1626 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
,
1627 (((Elf32_External_Rel
*)
1629 + srelgot
->reloc_count
));
1630 ++srelgot
->reloc_count
;
1633 local_got_offsets
[r_symndx
] |= 1;
1636 value
= sgot
->output_offset
+ off
;
1639 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1640 contents
, rel
->r_offset
, value
,
1644 /* Relocation is to the entry for this symbol in the
1645 procedure linkage table. */
1647 /* Resolve a PLT32 reloc against a local symbol directly,
1648 without using the procedure linkage table. */
1650 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1651 contents
, rel
->r_offset
, value
,
1654 if (h
->plt
.offset
== (bfd_vma
) -1)
1655 /* We didn't make a PLT entry for this symbol. This
1656 happens when statically linking PIC code, or when
1657 using -Bsymbolic. */
1658 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1659 contents
, rel
->r_offset
, value
,
1662 BFD_ASSERT(splt
!= NULL
);
1664 return bfd_reloc_notsupported
;
1666 value
= (splt
->output_section
->vma
1667 + splt
->output_offset
1669 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1670 contents
, rel
->r_offset
, value
,
1674 return bfd_reloc_notsupported
;
1676 case R_ARM_AMP_VCALL9
:
1677 return bfd_reloc_notsupported
;
1679 case R_ARM_RSBREL32
:
1680 return bfd_reloc_notsupported
;
1682 case R_ARM_THM_RPC22
:
1683 return bfd_reloc_notsupported
;
1686 return bfd_reloc_notsupported
;
1689 return bfd_reloc_notsupported
;
1692 return bfd_reloc_notsupported
;
1695 return bfd_reloc_notsupported
;
1698 return bfd_reloc_notsupported
;
1703 /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */
1705 arm_add_to_rel (abfd
, address
, howto
, increment
)
1708 reloc_howto_type
* howto
;
1709 bfd_signed_vma increment
;
1711 bfd_signed_vma addend
;
1713 if (howto
->type
== R_ARM_THM_PC22
)
1715 int upper_insn
, lower_insn
;
1718 upper_insn
= bfd_get_16 (abfd
, address
);
1719 lower_insn
= bfd_get_16 (abfd
, address
+ 2);
1720 upper
= upper_insn
& 0x7ff;
1721 lower
= lower_insn
& 0x7ff;
1723 addend
= (upper
<< 12) | (lower
<< 1);
1724 addend
+= increment
;
1727 upper_insn
= (upper_insn
& 0xf800) | ((addend
>> 11) & 0x7ff);
1728 lower_insn
= (lower_insn
& 0xf800) | (addend
& 0x7ff);
1730 bfd_put_16 (abfd
, (bfd_vma
) upper_insn
, address
);
1731 bfd_put_16 (abfd
, (bfd_vma
) lower_insn
, address
+ 2);
1737 contents
= bfd_get_32 (abfd
, address
);
1739 /* Get the (signed) value from the instruction. */
1740 addend
= contents
& howto
->src_mask
;
1741 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1743 bfd_signed_vma mask
;
1746 mask
&= ~ howto
->src_mask
;
1750 /* Add in the increment, (which is a byte value). */
1751 switch (howto
->type
)
1754 addend
+= increment
;
1758 addend
<<= howto
->size
;
1759 addend
+= increment
;
1761 /* Should we check for overflow here ? */
1763 /* Drop any undesired bits. */
1764 addend
>>= howto
->rightshift
;
1768 contents
= (contents
& ~ howto
->dst_mask
) | (addend
& howto
->dst_mask
);
1770 bfd_put_32 (abfd
, contents
, address
);
1773 #endif /* USE_REL */
1775 /* Relocate an ARM ELF section. */
1777 elf32_arm_relocate_section (output_bfd
, info
, input_bfd
, input_section
,
1778 contents
, relocs
, local_syms
, local_sections
)
1780 struct bfd_link_info
* info
;
1782 asection
* input_section
;
1783 bfd_byte
* contents
;
1784 Elf_Internal_Rela
* relocs
;
1785 Elf_Internal_Sym
* local_syms
;
1786 asection
** local_sections
;
1788 Elf_Internal_Shdr
* symtab_hdr
;
1789 struct elf_link_hash_entry
** sym_hashes
;
1790 Elf_Internal_Rela
* rel
;
1791 Elf_Internal_Rela
* relend
;
1794 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1795 sym_hashes
= elf_sym_hashes (input_bfd
);
1798 relend
= relocs
+ input_section
->reloc_count
;
1799 for (; rel
< relend
; rel
++)
1802 reloc_howto_type
* howto
;
1803 unsigned long r_symndx
;
1804 Elf_Internal_Sym
* sym
;
1806 struct elf_link_hash_entry
* h
;
1808 bfd_reloc_status_type r
;
1811 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1812 r_type
= ELF32_R_TYPE (rel
->r_info
);
1814 if ( r_type
== R_ARM_GNU_VTENTRY
1815 || r_type
== R_ARM_GNU_VTINHERIT
)
1819 elf32_arm_info_to_howto (input_bfd
, & bfd_reloc
,
1820 (Elf_Internal_Rel
*) rel
);
1822 elf32_arm_info_to_howto (input_bfd
, & bfd_reloc
, rel
);
1824 howto
= bfd_reloc
.howto
;
1826 if (info
->relocateable
)
1828 /* This is a relocateable link. We don't have to change
1829 anything, unless the reloc is against a section symbol,
1830 in which case we have to adjust according to where the
1831 section symbol winds up in the output section. */
1832 if (r_symndx
< symtab_hdr
->sh_info
)
1834 sym
= local_syms
+ r_symndx
;
1835 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
1837 sec
= local_sections
[r_symndx
];
1839 arm_add_to_rel (input_bfd
, contents
+ rel
->r_offset
,
1841 (bfd_signed_vma
) (sec
->output_offset
1844 rel
->r_addend
+= (sec
->output_offset
+ sym
->st_value
);
1852 /* This is a final link. */
1857 if (r_symndx
< symtab_hdr
->sh_info
)
1859 sym
= local_syms
+ r_symndx
;
1860 sec
= local_sections
[r_symndx
];
1862 relocation
= (sec
->output_section
->vma
1863 + sec
->output_offset
1865 if ((sec
->flags
& SEC_MERGE
)
1866 && ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
1869 bfd_vma addend
, value
;
1871 if (howto
->rightshift
)
1873 (*_bfd_error_handler
)
1874 (_("%s(%s+0x%lx): %s relocation against SEC_MERGE section"),
1875 bfd_archive_filename (input_bfd
),
1876 bfd_get_section_name (input_bfd
, input_section
),
1877 (long) rel
->r_offset
, howto
->name
);
1881 value
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
1883 /* Get the (signed) value from the instruction. */
1884 addend
= value
& howto
->src_mask
;
1885 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1887 bfd_signed_vma mask
;
1890 mask
&= ~ howto
->src_mask
;
1895 _bfd_merged_section_offset (output_bfd
, &msec
,
1896 elf_section_data (sec
)->merge_info
,
1897 sym
->st_value
+ addend
, (bfd_vma
) 0)
1899 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
1900 value
= (value
& ~ howto
->dst_mask
) | (addend
& howto
->dst_mask
);
1901 bfd_put_32 (input_bfd
, value
, contents
+ rel
->r_offset
);
1904 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, sec
, rel
);
1909 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1911 while ( h
->root
.type
== bfd_link_hash_indirect
1912 || h
->root
.type
== bfd_link_hash_warning
)
1913 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1915 if ( h
->root
.type
== bfd_link_hash_defined
1916 || h
->root
.type
== bfd_link_hash_defweak
)
1918 int relocation_needed
= 1;
1920 sec
= h
->root
.u
.def
.section
;
1922 /* In these cases, we don't need the relocation value.
1923 We check specially because in some obscure cases
1924 sec->output_section will be NULL. */
1929 case R_ARM_THM_PC22
:
1932 (!info
->symbolic
&& h
->dynindx
!= -1)
1933 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
1935 && ((input_section
->flags
& SEC_ALLOC
) != 0
1936 /* DWARF will emit R_ARM_ABS32 relocations in its
1937 sections against symbols defined externally
1938 in shared libraries. We can't do anything
1940 || ((input_section
->flags
& SEC_DEBUGGING
) != 0
1941 && (h
->elf_link_hash_flags
1942 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0))
1944 relocation_needed
= 0;
1948 relocation_needed
= 0;
1952 if (elf_hash_table(info
)->dynamic_sections_created
1954 || (!info
->symbolic
&& h
->dynindx
!= -1)
1955 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
1958 relocation_needed
= 0;
1962 if (h
->plt
.offset
!= (bfd_vma
)-1)
1963 relocation_needed
= 0;
1967 if (sec
->output_section
== NULL
)
1969 (*_bfd_error_handler
)
1970 (_("%s: warning: unresolvable relocation %d against symbol `%s' from %s section"),
1971 bfd_archive_filename (input_bfd
),
1973 h
->root
.root
.string
,
1974 bfd_get_section_name (input_bfd
, input_section
));
1975 relocation_needed
= 0;
1979 if (relocation_needed
)
1980 relocation
= h
->root
.u
.def
.value
1981 + sec
->output_section
->vma
1982 + sec
->output_offset
;
1986 else if (h
->root
.type
== bfd_link_hash_undefweak
)
1988 else if (info
->shared
&& !info
->symbolic
1989 && !info
->no_undefined
1990 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
1994 if (!((*info
->callbacks
->undefined_symbol
)
1995 (info
, h
->root
.root
.string
, input_bfd
,
1996 input_section
, rel
->r_offset
,
1997 (!info
->shared
|| info
->no_undefined
1998 || ELF_ST_VISIBILITY (h
->other
)))))
2005 name
= h
->root
.root
.string
;
2008 name
= (bfd_elf_string_from_elf_section
2009 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
));
2010 if (name
== NULL
|| *name
== '\0')
2011 name
= bfd_section_name (input_bfd
, sec
);
2014 r
= elf32_arm_final_link_relocate (howto
, input_bfd
, output_bfd
,
2015 input_section
, contents
, rel
,
2016 relocation
, info
, sec
, name
,
2017 (h
? ELF_ST_TYPE (h
->type
) :
2018 ELF_ST_TYPE (sym
->st_info
)), h
);
2020 if (r
!= bfd_reloc_ok
)
2022 const char * msg
= (const char *) 0;
2026 case bfd_reloc_overflow
:
2027 /* If the overflowing reloc was to an undefined symbol,
2028 we have already printed one error message and there
2029 is no point complaining again. */
2031 h
->root
.type
!= bfd_link_hash_undefined
)
2032 && (!((*info
->callbacks
->reloc_overflow
)
2033 (info
, name
, howto
->name
, (bfd_vma
) 0,
2034 input_bfd
, input_section
, rel
->r_offset
))))
2038 case bfd_reloc_undefined
:
2039 if (!((*info
->callbacks
->undefined_symbol
)
2040 (info
, name
, input_bfd
, input_section
,
2041 rel
->r_offset
, true)))
2045 case bfd_reloc_outofrange
:
2046 msg
= _("internal error: out of range error");
2049 case bfd_reloc_notsupported
:
2050 msg
= _("internal error: unsupported relocation error");
2053 case bfd_reloc_dangerous
:
2054 msg
= _("internal error: dangerous error");
2058 msg
= _("internal error: unknown error");
2062 if (!((*info
->callbacks
->warning
)
2063 (info
, msg
, name
, input_bfd
, input_section
,
2074 /* Function to keep ARM specific flags in the ELF header. */
2076 elf32_arm_set_private_flags (abfd
, flags
)
2080 if (elf_flags_init (abfd
)
2081 && elf_elfheader (abfd
)->e_flags
!= flags
)
2083 if (EF_ARM_EABI_VERSION (flags
) == EF_ARM_EABI_UNKNOWN
)
2085 if (flags
& EF_ARM_INTERWORK
)
2086 (*_bfd_error_handler
) (_("\
2087 Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"),
2088 bfd_archive_filename (abfd
));
2090 _bfd_error_handler (_("\
2091 Warning: Clearing the interwork flag of %s due to outside request"),
2092 bfd_archive_filename (abfd
));
2097 elf_elfheader (abfd
)->e_flags
= flags
;
2098 elf_flags_init (abfd
) = true;
2104 /* Copy backend specific data from one object module to another. */
2107 elf32_arm_copy_private_bfd_data (ibfd
, obfd
)
2114 if ( bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2115 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2118 in_flags
= elf_elfheader (ibfd
)->e_flags
;
2119 out_flags
= elf_elfheader (obfd
)->e_flags
;
2121 if (elf_flags_init (obfd
)
2122 && EF_ARM_EABI_VERSION (out_flags
) == EF_ARM_EABI_UNKNOWN
2123 && in_flags
!= out_flags
)
2125 /* Cannot mix APCS26 and APCS32 code. */
2126 if ((in_flags
& EF_ARM_APCS_26
) != (out_flags
& EF_ARM_APCS_26
))
2129 /* Cannot mix float APCS and non-float APCS code. */
2130 if ((in_flags
& EF_ARM_APCS_FLOAT
) != (out_flags
& EF_ARM_APCS_FLOAT
))
2133 /* If the src and dest have different interworking flags
2134 then turn off the interworking bit. */
2135 if ((in_flags
& EF_ARM_INTERWORK
) != (out_flags
& EF_ARM_INTERWORK
))
2137 if (out_flags
& EF_ARM_INTERWORK
)
2138 _bfd_error_handler (_("\
2139 Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"),
2140 bfd_get_filename (obfd
),
2141 bfd_archive_filename (ibfd
));
2143 in_flags
&= ~EF_ARM_INTERWORK
;
2146 /* Likewise for PIC, though don't warn for this case. */
2147 if ((in_flags
& EF_ARM_PIC
) != (out_flags
& EF_ARM_PIC
))
2148 in_flags
&= ~EF_ARM_PIC
;
2151 elf_elfheader (obfd
)->e_flags
= in_flags
;
2152 elf_flags_init (obfd
) = true;
2157 /* Merge backend specific data from an object file to the output
2158 object file when linking. */
2161 elf32_arm_merge_private_bfd_data (ibfd
, obfd
)
2167 boolean flags_compatible
= true;
2168 boolean null_input_bfd
= true;
2171 /* Check if we have the same endianess. */
2172 if (_bfd_generic_verify_endian_match (ibfd
, obfd
) == false)
2175 if ( bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2176 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2179 /* The input BFD must have had its flags initialised. */
2180 /* The following seems bogus to me -- The flags are initialized in
2181 the assembler but I don't think an elf_flags_init field is
2182 written into the object. */
2183 /* BFD_ASSERT (elf_flags_init (ibfd)); */
2185 in_flags
= elf_elfheader (ibfd
)->e_flags
;
2186 out_flags
= elf_elfheader (obfd
)->e_flags
;
2188 if (!elf_flags_init (obfd
))
2190 /* If the input is the default architecture and had the default
2191 flags then do not bother setting the flags for the output
2192 architecture, instead allow future merges to do this. If no
2193 future merges ever set these flags then they will retain their
2194 uninitialised values, which surprise surprise, correspond
2195 to the default values. */
2196 if (bfd_get_arch_info (ibfd
)->the_default
2197 && elf_elfheader (ibfd
)->e_flags
== 0)
2200 elf_flags_init (obfd
) = true;
2201 elf_elfheader (obfd
)->e_flags
= in_flags
;
2203 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
2204 && bfd_get_arch_info (obfd
)->the_default
)
2205 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
), bfd_get_mach (ibfd
));
2210 /* Identical flags must be compatible. */
2211 if (in_flags
== out_flags
)
2214 /* Check to see if the input BFD actually contains any sections.
2215 If not, its flags may not have been initialised either, but it cannot
2216 actually cause any incompatibility. */
2217 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2219 /* Ignore synthetic glue sections. */
2220 if (strcmp (sec
->name
, ".glue_7")
2221 && strcmp (sec
->name
, ".glue_7t"))
2223 null_input_bfd
= false;
2230 /* Complain about various flag mismatches. */
2231 if (EF_ARM_EABI_VERSION (in_flags
) != EF_ARM_EABI_VERSION (out_flags
))
2233 _bfd_error_handler (_("\
2234 Error: %s compiled for EABI version %d, whereas %s is compiled for version %d"),
2235 bfd_archive_filename (ibfd
),
2236 (in_flags
& EF_ARM_EABIMASK
) >> 24,
2237 bfd_get_filename (obfd
),
2238 (out_flags
& EF_ARM_EABIMASK
) >> 24);
2242 /* Not sure what needs to be checked for EABI versions >= 1. */
2243 if (EF_ARM_EABI_VERSION (in_flags
) == EF_ARM_EABI_UNKNOWN
)
2245 if ((in_flags
& EF_ARM_APCS_26
) != (out_flags
& EF_ARM_APCS_26
))
2247 _bfd_error_handler (_("\
2248 Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2249 bfd_archive_filename (ibfd
),
2250 in_flags
& EF_ARM_APCS_26
? 26 : 32,
2251 bfd_get_filename (obfd
),
2252 out_flags
& EF_ARM_APCS_26
? 26 : 32);
2253 flags_compatible
= false;
2256 if ((in_flags
& EF_ARM_APCS_FLOAT
) != (out_flags
& EF_ARM_APCS_FLOAT
))
2258 char *s1
= in_flags
& EF_ARM_APCS_FLOAT
? _("float") : _("integer");
2259 char *s2
= out_flags
& EF_ARM_APCS_FLOAT
? _("float") : _("integer");
2261 _bfd_error_handler (_("\
2262 Error: %s passes floats in %s registers, whereas %s passes them in %s registers"),
2263 bfd_archive_filename (ibfd
), s1
,
2264 bfd_get_filename (obfd
), s2
);
2265 flags_compatible
= false;
2268 #ifdef EF_ARM_SOFT_FLOAT
2269 if ((in_flags
& EF_ARM_SOFT_FLOAT
) != (out_flags
& EF_ARM_SOFT_FLOAT
))
2271 char *s1
= in_flags
& EF_ARM_SOFT_FLOAT
? _("soft") : _("hard");
2272 char *s2
= out_flags
& EF_ARM_SOFT_FLOAT
? _("soft") : _("hard");
2274 _bfd_error_handler (_ ("\
2275 Error: %s uses %s floating point, whereas %s uses %s floating point"),
2276 bfd_archive_filename (ibfd
), s1
,
2277 bfd_get_filename (obfd
), s2
);
2278 flags_compatible
= false;
2282 /* Interworking mismatch is only a warning. */
2283 if ((in_flags
& EF_ARM_INTERWORK
) != (out_flags
& EF_ARM_INTERWORK
))
2285 if (in_flags
& EF_ARM_INTERWORK
)
2287 _bfd_error_handler (_("\
2288 Warning: %s supports interworking, whereas %s does not"),
2289 bfd_archive_filename (ibfd
),
2290 bfd_get_filename (obfd
));
2294 _bfd_error_handler (_("\
2295 Warning: %s does not support interworking, whereas %s does"),
2296 bfd_archive_filename (ibfd
),
2297 bfd_get_filename (obfd
));
2302 return flags_compatible
;
2305 /* Display the flags field. */
2308 elf32_arm_print_private_bfd_data (abfd
, ptr
)
2312 FILE * file
= (FILE *) ptr
;
2313 unsigned long flags
;
2315 BFD_ASSERT (abfd
!= NULL
&& ptr
!= NULL
);
2317 /* Print normal ELF private data. */
2318 _bfd_elf_print_private_bfd_data (abfd
, ptr
);
2320 flags
= elf_elfheader (abfd
)->e_flags
;
2321 /* Ignore init flag - it may not be set, despite the flags field
2322 containing valid data. */
2324 /* xgettext:c-format */
2325 fprintf (file
, _("private flags = %lx:"), elf_elfheader (abfd
)->e_flags
);
2327 switch (EF_ARM_EABI_VERSION (flags
))
2329 case EF_ARM_EABI_UNKNOWN
:
2330 /* The following flag bits are GNU extenstions and not part of the
2331 official ARM ELF extended ABI. Hence they are only decoded if
2332 the EABI version is not set. */
2333 if (flags
& EF_ARM_INTERWORK
)
2334 fprintf (file
, _(" [interworking enabled]"));
2336 if (flags
& EF_ARM_APCS_26
)
2337 fprintf (file
, _(" [APCS-26]"));
2339 fprintf (file
, _(" [APCS-32]"));
2341 if (flags
& EF_ARM_APCS_FLOAT
)
2342 fprintf (file
, _(" [floats passed in float registers]"));
2344 if (flags
& EF_ARM_PIC
)
2345 fprintf (file
, _(" [position independent]"));
2347 if (flags
& EF_ARM_NEW_ABI
)
2348 fprintf (file
, _(" [new ABI]"));
2350 if (flags
& EF_ARM_OLD_ABI
)
2351 fprintf (file
, _(" [old ABI]"));
2353 if (flags
& EF_ARM_SOFT_FLOAT
)
2354 fprintf (file
, _(" [software FP]"));
2356 flags
&= ~(EF_ARM_INTERWORK
| EF_ARM_APCS_26
| EF_ARM_APCS_FLOAT
| EF_ARM_PIC
2357 | EF_ARM_NEW_ABI
| EF_ARM_OLD_ABI
| EF_ARM_SOFT_FLOAT
);
2360 case EF_ARM_EABI_VER1
:
2361 fprintf (file
, _(" [Version1 EABI]"));
2363 if (flags
& EF_ARM_SYMSARESORTED
)
2364 fprintf (file
, _(" [sorted symbol table]"));
2366 fprintf (file
, _(" [unsorted symbol table]"));
2368 flags
&= ~ EF_ARM_SYMSARESORTED
;
2371 case EF_ARM_EABI_VER2
:
2372 fprintf (file
, _(" [Version2 EABI]"));
2374 if (flags
& EF_ARM_SYMSARESORTED
)
2375 fprintf (file
, _(" [sorted symbol table]"));
2377 fprintf (file
, _(" [unsorted symbol table]"));
2379 if (flags
& EF_ARM_DYNSYMSUSESEGIDX
)
2380 fprintf (file
, _(" [dynamic symbols use segment index]"));
2382 if (flags
& EF_ARM_MAPSYMSFIRST
)
2383 fprintf (file
, _(" [mapping symbols precede others]"));
2385 flags
&= ~(EF_ARM_SYMSARESORTED
| EF_ARM_DYNSYMSUSESEGIDX
2386 | EF_ARM_MAPSYMSFIRST
);
2390 fprintf (file
, _(" <EABI version unrecognised>"));
2394 flags
&= ~ EF_ARM_EABIMASK
;
2396 if (flags
& EF_ARM_RELEXEC
)
2397 fprintf (file
, _(" [relocatable executable]"));
2399 if (flags
& EF_ARM_HASENTRY
)
2400 fprintf (file
, _(" [has entry point]"));
2402 flags
&= ~ (EF_ARM_RELEXEC
| EF_ARM_HASENTRY
);
2405 fprintf (file
, _("<Unrecognised flag bits set>"));
2413 elf32_arm_get_symbol_type (elf_sym
, type
)
2414 Elf_Internal_Sym
* elf_sym
;
2417 switch (ELF_ST_TYPE (elf_sym
->st_info
))
2420 return ELF_ST_TYPE (elf_sym
->st_info
);
2423 /* If the symbol is not an object, return the STT_ARM_16BIT flag.
2424 This allows us to distinguish between data used by Thumb instructions
2425 and non-data (which is probably code) inside Thumb regions of an
2427 if (type
!= STT_OBJECT
)
2428 return ELF_ST_TYPE (elf_sym
->st_info
);
2439 elf32_arm_gc_mark_hook (abfd
, info
, rel
, h
, sym
)
2441 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
2442 Elf_Internal_Rela
*rel
;
2443 struct elf_link_hash_entry
*h
;
2444 Elf_Internal_Sym
*sym
;
2448 switch (ELF32_R_TYPE (rel
->r_info
))
2450 case R_ARM_GNU_VTINHERIT
:
2451 case R_ARM_GNU_VTENTRY
:
2455 switch (h
->root
.type
)
2457 case bfd_link_hash_defined
:
2458 case bfd_link_hash_defweak
:
2459 return h
->root
.u
.def
.section
;
2461 case bfd_link_hash_common
:
2462 return h
->root
.u
.c
.p
->section
;
2471 if (!(elf_bad_symtab (abfd
)
2472 && ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
2473 && ! ((sym
->st_shndx
<= 0 || sym
->st_shndx
>= SHN_LORESERVE
)
2474 && sym
->st_shndx
!= SHN_COMMON
))
2476 return bfd_section_from_elf_index (abfd
, sym
->st_shndx
);
2482 /* Update the got entry reference counts for the section being removed. */
2485 elf32_arm_gc_sweep_hook (abfd
, info
, sec
, relocs
)
2486 bfd
*abfd ATTRIBUTE_UNUSED
;
2487 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
2488 asection
*sec ATTRIBUTE_UNUSED
;
2489 const Elf_Internal_Rela
*relocs ATTRIBUTE_UNUSED
;
2491 /* We don't support garbage collection of GOT and PLT relocs yet. */
2495 /* Look through the relocs for a section during the first phase. */
2498 elf32_arm_check_relocs (abfd
, info
, sec
, relocs
)
2500 struct bfd_link_info
* info
;
2502 const Elf_Internal_Rela
* relocs
;
2504 Elf_Internal_Shdr
* symtab_hdr
;
2505 struct elf_link_hash_entry
** sym_hashes
;
2506 struct elf_link_hash_entry
** sym_hashes_end
;
2507 const Elf_Internal_Rela
* rel
;
2508 const Elf_Internal_Rela
* rel_end
;
2510 asection
* sgot
, *srelgot
, *sreloc
;
2511 bfd_vma
* local_got_offsets
;
2513 if (info
->relocateable
)
2516 sgot
= srelgot
= sreloc
= NULL
;
2518 dynobj
= elf_hash_table (info
)->dynobj
;
2519 local_got_offsets
= elf_local_got_offsets (abfd
);
2521 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2522 sym_hashes
= elf_sym_hashes (abfd
);
2523 sym_hashes_end
= sym_hashes
2524 + symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
2526 if (!elf_bad_symtab (abfd
))
2527 sym_hashes_end
-= symtab_hdr
->sh_info
;
2529 rel_end
= relocs
+ sec
->reloc_count
;
2530 for (rel
= relocs
; rel
< rel_end
; rel
++)
2532 struct elf_link_hash_entry
*h
;
2533 unsigned long r_symndx
;
2535 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2536 if (r_symndx
< symtab_hdr
->sh_info
)
2539 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2541 /* Some relocs require a global offset table. */
2544 switch (ELF32_R_TYPE (rel
->r_info
))
2549 elf_hash_table (info
)->dynobj
= dynobj
= abfd
;
2550 if (! _bfd_elf_create_got_section (dynobj
, info
))
2559 switch (ELF32_R_TYPE (rel
->r_info
))
2562 /* This symbol requires a global offset table entry. */
2565 sgot
= bfd_get_section_by_name (dynobj
, ".got");
2566 BFD_ASSERT (sgot
!= NULL
);
2569 /* Get the got relocation section if necessary. */
2571 && (h
!= NULL
|| info
->shared
))
2573 srelgot
= bfd_get_section_by_name (dynobj
, ".rel.got");
2575 /* If no got relocation section, make one and initialize. */
2576 if (srelgot
== NULL
)
2578 srelgot
= bfd_make_section (dynobj
, ".rel.got");
2580 || ! bfd_set_section_flags (dynobj
, srelgot
,
2585 | SEC_LINKER_CREATED
2587 || ! bfd_set_section_alignment (dynobj
, srelgot
, 2))
2594 if (h
->got
.offset
!= (bfd_vma
) -1)
2595 /* We have already allocated space in the .got. */
2598 h
->got
.offset
= sgot
->_raw_size
;
2600 /* Make sure this symbol is output as a dynamic symbol. */
2601 if (h
->dynindx
== -1)
2602 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
2605 srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
2609 /* This is a global offset table entry for a local
2611 if (local_got_offsets
== NULL
)
2616 size
= symtab_hdr
->sh_info
;
2617 size
*= sizeof (bfd_vma
);
2618 local_got_offsets
= (bfd_vma
*) bfd_alloc (abfd
, size
);
2619 if (local_got_offsets
== NULL
)
2621 elf_local_got_offsets (abfd
) = local_got_offsets
;
2622 for (i
= 0; i
< symtab_hdr
->sh_info
; i
++)
2623 local_got_offsets
[i
] = (bfd_vma
) -1;
2626 if (local_got_offsets
[r_symndx
] != (bfd_vma
) -1)
2627 /* We have already allocated space in the .got. */
2630 local_got_offsets
[r_symndx
] = sgot
->_raw_size
;
2633 /* If we are generating a shared object, we need to
2634 output a R_ARM_RELATIVE reloc so that the dynamic
2635 linker can adjust this GOT entry. */
2636 srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
2639 sgot
->_raw_size
+= 4;
2643 /* This symbol requires a procedure linkage table entry. We
2644 actually build the entry in adjust_dynamic_symbol,
2645 because this might be a case of linking PIC code which is
2646 never referenced by a dynamic object, in which case we
2647 don't need to generate a procedure linkage table entry
2650 /* If this is a local symbol, we resolve it directly without
2651 creating a procedure linkage table entry. */
2655 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_PLT
;
2661 /* If we are creating a shared library, and this is a reloc
2662 against a global symbol, or a non PC relative reloc
2663 against a local symbol, then we need to copy the reloc
2664 into the shared library. However, if we are linking with
2665 -Bsymbolic, we do not need to copy a reloc against a
2666 global symbol which is defined in an object we are
2667 including in the link (i.e., DEF_REGULAR is set). At
2668 this point we have not seen all the input files, so it is
2669 possible that DEF_REGULAR is not set now but will be set
2670 later (it is never cleared). We account for that
2671 possibility below by storing information in the
2672 pcrel_relocs_copied field of the hash table entry. */
2674 && (ELF32_R_TYPE (rel
->r_info
) != R_ARM_PC24
2676 && (! info
->symbolic
2677 || (h
->elf_link_hash_flags
2678 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
2680 /* When creating a shared object, we must copy these
2681 reloc types into the output file. We create a reloc
2682 section in dynobj and make room for this reloc. */
2687 name
= (bfd_elf_string_from_elf_section
2689 elf_elfheader (abfd
)->e_shstrndx
,
2690 elf_section_data (sec
)->rel_hdr
.sh_name
));
2694 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
2695 && strcmp (bfd_get_section_name (abfd
, sec
),
2698 sreloc
= bfd_get_section_by_name (dynobj
, name
);
2703 sreloc
= bfd_make_section (dynobj
, name
);
2704 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
2705 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2706 if ((sec
->flags
& SEC_ALLOC
) != 0)
2707 flags
|= SEC_ALLOC
| SEC_LOAD
;
2709 || ! bfd_set_section_flags (dynobj
, sreloc
, flags
)
2710 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
2713 if (sec
->flags
& SEC_READONLY
)
2714 info
->flags
|= DF_TEXTREL
;
2717 sreloc
->_raw_size
+= sizeof (Elf32_External_Rel
);
2718 /* If we are linking with -Bsymbolic, and this is a
2719 global symbol, we count the number of PC relative
2720 relocations we have entered for this symbol, so that
2721 we can discard them again if the symbol is later
2722 defined by a regular object. Note that this function
2723 is only called if we are using an elf_i386 linker
2724 hash table, which means that h is really a pointer to
2725 an elf_i386_link_hash_entry. */
2726 if (h
!= NULL
&& info
->symbolic
2727 && ELF32_R_TYPE (rel
->r_info
) == R_ARM_PC24
)
2729 struct elf32_arm_link_hash_entry
* eh
;
2730 struct elf32_arm_pcrel_relocs_copied
* p
;
2732 eh
= (struct elf32_arm_link_hash_entry
*) h
;
2734 for (p
= eh
->pcrel_relocs_copied
; p
!= NULL
; p
= p
->next
)
2735 if (p
->section
== sreloc
)
2740 p
= ((struct elf32_arm_pcrel_relocs_copied
*)
2741 bfd_alloc (dynobj
, (bfd_size_type
) sizeof * p
));
2744 p
->next
= eh
->pcrel_relocs_copied
;
2745 eh
->pcrel_relocs_copied
= p
;
2746 p
->section
= sreloc
;
2755 /* This relocation describes the C++ object vtable hierarchy.
2756 Reconstruct it for later use during GC. */
2757 case R_ARM_GNU_VTINHERIT
:
2758 if (!_bfd_elf32_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2762 /* This relocation describes which C++ vtable entries are actually
2763 used. Record for later use during GC. */
2764 case R_ARM_GNU_VTENTRY
:
2765 if (!_bfd_elf32_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
2774 /* Find the nearest line to a particular section and offset, for error
2775 reporting. This code is a duplicate of the code in elf.c, except
2776 that it also accepts STT_ARM_TFUNC as a symbol that names a function. */
2779 elf32_arm_find_nearest_line
2780 (abfd
, section
, symbols
, offset
, filename_ptr
, functionname_ptr
, line_ptr
)
2785 const char ** filename_ptr
;
2786 const char ** functionname_ptr
;
2787 unsigned int * line_ptr
;
2790 const char * filename
;
2795 if (_bfd_dwarf2_find_nearest_line (abfd
, section
, symbols
, offset
,
2796 filename_ptr
, functionname_ptr
,
2798 &elf_tdata (abfd
)->dwarf2_find_line_info
))
2801 if (! _bfd_stab_section_find_nearest_line (abfd
, symbols
, section
, offset
,
2802 &found
, filename_ptr
,
2803 functionname_ptr
, line_ptr
,
2804 &elf_tdata (abfd
)->line_info
))
2810 if (symbols
== NULL
)
2817 for (p
= symbols
; *p
!= NULL
; p
++)
2821 q
= (elf_symbol_type
*) *p
;
2823 if (bfd_get_section (&q
->symbol
) != section
)
2826 switch (ELF_ST_TYPE (q
->internal_elf_sym
.st_info
))
2831 filename
= bfd_asymbol_name (&q
->symbol
);
2836 if (q
->symbol
.section
== section
2837 && q
->symbol
.value
>= low_func
2838 && q
->symbol
.value
<= offset
)
2840 func
= (asymbol
*) q
;
2841 low_func
= q
->symbol
.value
;
2850 *filename_ptr
= filename
;
2851 *functionname_ptr
= bfd_asymbol_name (func
);
2857 /* Adjust a symbol defined by a dynamic object and referenced by a
2858 regular object. The current definition is in some section of the
2859 dynamic object, but we're not including those sections. We have to
2860 change the definition to something the rest of the link can
2864 elf32_arm_adjust_dynamic_symbol (info
, h
)
2865 struct bfd_link_info
* info
;
2866 struct elf_link_hash_entry
* h
;
2870 unsigned int power_of_two
;
2872 dynobj
= elf_hash_table (info
)->dynobj
;
2874 /* Make sure we know what is going on here. */
2875 BFD_ASSERT (dynobj
!= NULL
2876 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
)
2877 || h
->weakdef
!= NULL
2878 || ((h
->elf_link_hash_flags
2879 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2880 && (h
->elf_link_hash_flags
2881 & ELF_LINK_HASH_REF_REGULAR
) != 0
2882 && (h
->elf_link_hash_flags
2883 & ELF_LINK_HASH_DEF_REGULAR
) == 0)));
2885 /* If this is a function, put it in the procedure linkage table. We
2886 will fill in the contents of the procedure linkage table later,
2887 when we know the address of the .got section. */
2888 if (h
->type
== STT_FUNC
2889 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0)
2892 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2893 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) == 0)
2895 /* This case can occur if we saw a PLT32 reloc in an input
2896 file, but the symbol was never referred to by a dynamic
2897 object. In such a case, we don't actually need to build
2898 a procedure linkage table, and we can just do a PC32
2900 BFD_ASSERT ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0);
2904 /* Make sure this symbol is output as a dynamic symbol. */
2905 if (h
->dynindx
== -1)
2907 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
2911 s
= bfd_get_section_by_name (dynobj
, ".plt");
2912 BFD_ASSERT (s
!= NULL
);
2914 /* If this is the first .plt entry, make room for the special
2916 if (s
->_raw_size
== 0)
2917 s
->_raw_size
+= PLT_ENTRY_SIZE
;
2919 /* If this symbol is not defined in a regular file, and we are
2920 not generating a shared library, then set the symbol to this
2921 location in the .plt. This is required to make function
2922 pointers compare as equal between the normal executable and
2923 the shared library. */
2925 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2927 h
->root
.u
.def
.section
= s
;
2928 h
->root
.u
.def
.value
= s
->_raw_size
;
2931 h
->plt
.offset
= s
->_raw_size
;
2933 /* Make room for this entry. */
2934 s
->_raw_size
+= PLT_ENTRY_SIZE
;
2936 /* We also need to make an entry in the .got.plt section, which
2937 will be placed in the .got section by the linker script. */
2938 s
= bfd_get_section_by_name (dynobj
, ".got.plt");
2939 BFD_ASSERT (s
!= NULL
);
2942 /* We also need to make an entry in the .rel.plt section. */
2944 s
= bfd_get_section_by_name (dynobj
, ".rel.plt");
2945 BFD_ASSERT (s
!= NULL
);
2946 s
->_raw_size
+= sizeof (Elf32_External_Rel
);
2951 /* If this is a weak symbol, and there is a real definition, the
2952 processor independent code will have arranged for us to see the
2953 real definition first, and we can just use the same value. */
2954 if (h
->weakdef
!= NULL
)
2956 BFD_ASSERT (h
->weakdef
->root
.type
== bfd_link_hash_defined
2957 || h
->weakdef
->root
.type
== bfd_link_hash_defweak
);
2958 h
->root
.u
.def
.section
= h
->weakdef
->root
.u
.def
.section
;
2959 h
->root
.u
.def
.value
= h
->weakdef
->root
.u
.def
.value
;
2963 /* This is a reference to a symbol defined by a dynamic object which
2964 is not a function. */
2966 /* If we are creating a shared library, we must presume that the
2967 only references to the symbol are via the global offset table.
2968 For such cases we need not do anything here; the relocations will
2969 be handled correctly by relocate_section. */
2973 /* We must allocate the symbol in our .dynbss section, which will
2974 become part of the .bss section of the executable. There will be
2975 an entry for this symbol in the .dynsym section. The dynamic
2976 object will contain position independent code, so all references
2977 from the dynamic object to this symbol will go through the global
2978 offset table. The dynamic linker will use the .dynsym entry to
2979 determine the address it must put in the global offset table, so
2980 both the dynamic object and the regular object will refer to the
2981 same memory location for the variable. */
2982 s
= bfd_get_section_by_name (dynobj
, ".dynbss");
2983 BFD_ASSERT (s
!= NULL
);
2985 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to
2986 copy the initial value out of the dynamic object and into the
2987 runtime process image. We need to remember the offset into the
2988 .rel.bss section we are going to use. */
2989 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
2993 srel
= bfd_get_section_by_name (dynobj
, ".rel.bss");
2994 BFD_ASSERT (srel
!= NULL
);
2995 srel
->_raw_size
+= sizeof (Elf32_External_Rel
);
2996 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_COPY
;
2999 /* We need to figure out the alignment required for this symbol. I
3000 have no idea how ELF linkers handle this. */
3001 power_of_two
= bfd_log2 (h
->size
);
3002 if (power_of_two
> 3)
3005 /* Apply the required alignment. */
3006 s
->_raw_size
= BFD_ALIGN (s
->_raw_size
,
3007 (bfd_size_type
) (1 << power_of_two
));
3008 if (power_of_two
> bfd_get_section_alignment (dynobj
, s
))
3010 if (! bfd_set_section_alignment (dynobj
, s
, power_of_two
))
3014 /* Define the symbol as being at this point in the section. */
3015 h
->root
.u
.def
.section
= s
;
3016 h
->root
.u
.def
.value
= s
->_raw_size
;
3018 /* Increment the section size to make room for the symbol. */
3019 s
->_raw_size
+= h
->size
;
3024 /* Set the sizes of the dynamic sections. */
3027 elf32_arm_size_dynamic_sections (output_bfd
, info
)
3028 bfd
* output_bfd ATTRIBUTE_UNUSED
;
3029 struct bfd_link_info
* info
;
3036 dynobj
= elf_hash_table (info
)->dynobj
;
3037 BFD_ASSERT (dynobj
!= NULL
);
3039 if (elf_hash_table (info
)->dynamic_sections_created
)
3041 /* Set the contents of the .interp section to the interpreter. */
3044 s
= bfd_get_section_by_name (dynobj
, ".interp");
3045 BFD_ASSERT (s
!= NULL
);
3046 s
->_raw_size
= sizeof ELF_DYNAMIC_INTERPRETER
;
3047 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
3052 /* We may have created entries in the .rel.got section.
3053 However, if we are not creating the dynamic sections, we will
3054 not actually use these entries. Reset the size of .rel.got,
3055 which will cause it to get stripped from the output file
3057 s
= bfd_get_section_by_name (dynobj
, ".rel.got");
3062 /* If this is a -Bsymbolic shared link, then we need to discard all
3063 PC relative relocs against symbols defined in a regular object.
3064 We allocated space for them in the check_relocs routine, but we
3065 will not fill them in in the relocate_section routine. */
3066 if (info
->shared
&& info
->symbolic
)
3067 elf32_arm_link_hash_traverse (elf32_arm_hash_table (info
),
3068 elf32_arm_discard_copies
,
3071 /* The check_relocs and adjust_dynamic_symbol entry points have
3072 determined the sizes of the various dynamic sections. Allocate
3076 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3081 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3084 /* It's OK to base decisions on the section name, because none
3085 of the dynobj section names depend upon the input files. */
3086 name
= bfd_get_section_name (dynobj
, s
);
3090 if (strcmp (name
, ".plt") == 0)
3092 if (s
->_raw_size
== 0)
3094 /* Strip this section if we don't need it; see the
3100 /* Remember whether there is a PLT. */
3104 else if (strncmp (name
, ".rel", 4) == 0)
3106 if (s
->_raw_size
== 0)
3108 /* If we don't need this section, strip it from the
3109 output file. This is mostly to handle .rel.bss and
3110 .rel.plt. We must create both sections in
3111 create_dynamic_sections, because they must be created
3112 before the linker maps input sections to output
3113 sections. The linker does that before
3114 adjust_dynamic_symbol is called, and it is that
3115 function which decides whether anything needs to go
3116 into these sections. */
3121 /* Remember whether there are any reloc sections other
3123 if (strcmp (name
, ".rel.plt") != 0)
3126 /* We use the reloc_count field as a counter if we need
3127 to copy relocs into the output file. */
3131 else if (strncmp (name
, ".got", 4) != 0)
3133 /* It's not one of our sections, so don't allocate space. */
3141 for (spp
= &s
->output_section
->owner
->sections
;
3142 *spp
!= s
->output_section
;
3143 spp
= &(*spp
)->next
)
3145 *spp
= s
->output_section
->next
;
3146 --s
->output_section
->owner
->section_count
;
3151 /* Allocate memory for the section contents. */
3152 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->_raw_size
);
3153 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3157 if (elf_hash_table (info
)->dynamic_sections_created
)
3159 /* Add some entries to the .dynamic section. We fill in the
3160 values later, in elf32_arm_finish_dynamic_sections, but we
3161 must add the entries now so that we get the correct size for
3162 the .dynamic section. The DT_DEBUG entry is filled in by the
3163 dynamic linker and used by the debugger. */
3164 #define add_dynamic_entry(TAG, VAL) \
3165 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
3169 if (!add_dynamic_entry (DT_DEBUG
, 0))
3175 if ( !add_dynamic_entry (DT_PLTGOT
, 0)
3176 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
3177 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
3178 || !add_dynamic_entry (DT_JMPREL
, 0))
3184 if ( !add_dynamic_entry (DT_REL
, 0)
3185 || !add_dynamic_entry (DT_RELSZ
, 0)
3186 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
3190 if ((info
->flags
& DF_TEXTREL
) != 0)
3192 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3194 info
->flags
|= DF_TEXTREL
;
3197 #undef add_synamic_entry
3202 /* This function is called via elf32_arm_link_hash_traverse if we are
3203 creating a shared object with -Bsymbolic. It discards the space
3204 allocated to copy PC relative relocs against symbols which are
3205 defined in regular objects. We allocated space for them in the
3206 check_relocs routine, but we won't fill them in in the
3207 relocate_section routine. */
3210 elf32_arm_discard_copies (h
, ignore
)
3211 struct elf32_arm_link_hash_entry
* h
;
3212 PTR ignore ATTRIBUTE_UNUSED
;
3214 struct elf32_arm_pcrel_relocs_copied
* s
;
3216 /* We only discard relocs for symbols defined in a regular object. */
3217 if ((h
->root
.elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3220 for (s
= h
->pcrel_relocs_copied
; s
!= NULL
; s
= s
->next
)
3221 s
->section
->_raw_size
-= s
->count
* sizeof (Elf32_External_Rel
);
3226 /* Finish up dynamic symbol handling. We set the contents of various
3227 dynamic sections here. */
3230 elf32_arm_finish_dynamic_symbol (output_bfd
, info
, h
, sym
)
3232 struct bfd_link_info
* info
;
3233 struct elf_link_hash_entry
* h
;
3234 Elf_Internal_Sym
* sym
;
3238 dynobj
= elf_hash_table (info
)->dynobj
;
3240 if (h
->plt
.offset
!= (bfd_vma
) -1)
3247 Elf_Internal_Rel rel
;
3249 /* This symbol has an entry in the procedure linkage table. Set
3252 BFD_ASSERT (h
->dynindx
!= -1);
3254 splt
= bfd_get_section_by_name (dynobj
, ".plt");
3255 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
3256 srel
= bfd_get_section_by_name (dynobj
, ".rel.plt");
3257 BFD_ASSERT (splt
!= NULL
&& sgot
!= NULL
&& srel
!= NULL
);
3259 /* Get the index in the procedure linkage table which
3260 corresponds to this symbol. This is the index of this symbol
3261 in all the symbols for which we are making plt entries. The
3262 first entry in the procedure linkage table is reserved. */
3263 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3265 /* Get the offset into the .got table of the entry that
3266 corresponds to this function. Each .got entry is 4 bytes.
3267 The first three are reserved. */
3268 got_offset
= (plt_index
+ 3) * 4;
3270 /* Fill in the entry in the procedure linkage table. */
3271 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[0],
3272 splt
->contents
+ h
->plt
.offset
+ 0);
3273 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[1],
3274 splt
->contents
+ h
->plt
.offset
+ 4);
3275 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[2],
3276 splt
->contents
+ h
->plt
.offset
+ 8);
3277 bfd_put_32 (output_bfd
,
3278 (sgot
->output_section
->vma
3279 + sgot
->output_offset
3281 - splt
->output_section
->vma
3282 - splt
->output_offset
3283 - h
->plt
.offset
- 12),
3284 splt
->contents
+ h
->plt
.offset
+ 12);
3286 /* Fill in the entry in the global offset table. */
3287 bfd_put_32 (output_bfd
,
3288 (splt
->output_section
->vma
3289 + splt
->output_offset
),
3290 sgot
->contents
+ got_offset
);
3292 /* Fill in the entry in the .rel.plt section. */
3293 rel
.r_offset
= (sgot
->output_section
->vma
3294 + sgot
->output_offset
3296 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_JUMP_SLOT
);
3297 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
3298 ((Elf32_External_Rel
*) srel
->contents
3301 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3303 /* Mark the symbol as undefined, rather than as defined in
3304 the .plt section. Leave the value alone. */
3305 sym
->st_shndx
= SHN_UNDEF
;
3306 /* If the symbol is weak, we do need to clear the value.
3307 Otherwise, the PLT entry would provide a definition for
3308 the symbol even if the symbol wasn't defined anywhere,
3309 and so the symbol would never be NULL. */
3310 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3316 if (h
->got
.offset
!= (bfd_vma
) -1)
3320 Elf_Internal_Rel rel
;
3322 /* This symbol has an entry in the global offset table. Set it
3324 sgot
= bfd_get_section_by_name (dynobj
, ".got");
3325 srel
= bfd_get_section_by_name (dynobj
, ".rel.got");
3326 BFD_ASSERT (sgot
!= NULL
&& srel
!= NULL
);
3328 rel
.r_offset
= (sgot
->output_section
->vma
3329 + sgot
->output_offset
3330 + (h
->got
.offset
&~ (bfd_vma
) 1));
3332 /* If this is a -Bsymbolic link, and the symbol is defined
3333 locally, we just want to emit a RELATIVE reloc. The entry in
3334 the global offset table will already have been initialized in
3335 the relocate_section function. */
3337 && (info
->symbolic
|| h
->dynindx
== -1)
3338 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
))
3339 rel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
3342 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ h
->got
.offset
);
3343 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_GLOB_DAT
);
3346 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
3347 ((Elf32_External_Rel
*) srel
->contents
3348 + srel
->reloc_count
));
3349 ++srel
->reloc_count
;
3352 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_COPY
) != 0)
3355 Elf_Internal_Rel rel
;
3357 /* This symbol needs a copy reloc. Set it up. */
3358 BFD_ASSERT (h
->dynindx
!= -1
3359 && (h
->root
.type
== bfd_link_hash_defined
3360 || h
->root
.type
== bfd_link_hash_defweak
));
3362 s
= bfd_get_section_by_name (h
->root
.u
.def
.section
->owner
,
3364 BFD_ASSERT (s
!= NULL
);
3366 rel
.r_offset
= (h
->root
.u
.def
.value
3367 + h
->root
.u
.def
.section
->output_section
->vma
3368 + h
->root
.u
.def
.section
->output_offset
);
3369 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_COPY
);
3370 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
3371 ((Elf32_External_Rel
*) s
->contents
3376 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3377 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3378 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
3379 sym
->st_shndx
= SHN_ABS
;
3384 /* Finish up the dynamic sections. */
3387 elf32_arm_finish_dynamic_sections (output_bfd
, info
)
3389 struct bfd_link_info
* info
;
3395 dynobj
= elf_hash_table (info
)->dynobj
;
3397 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
3398 BFD_ASSERT (sgot
!= NULL
);
3399 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3401 if (elf_hash_table (info
)->dynamic_sections_created
)
3404 Elf32_External_Dyn
*dyncon
, *dynconend
;
3406 splt
= bfd_get_section_by_name (dynobj
, ".plt");
3407 BFD_ASSERT (splt
!= NULL
&& sdyn
!= NULL
);
3409 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3410 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->_raw_size
);
3412 for (; dyncon
< dynconend
; dyncon
++)
3414 Elf_Internal_Dyn dyn
;
3418 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3431 s
= bfd_get_section_by_name (output_bfd
, name
);
3432 BFD_ASSERT (s
!= NULL
);
3433 dyn
.d_un
.d_ptr
= s
->vma
;
3434 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3438 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
3439 BFD_ASSERT (s
!= NULL
);
3440 if (s
->_cooked_size
!= 0)
3441 dyn
.d_un
.d_val
= s
->_cooked_size
;
3443 dyn
.d_un
.d_val
= s
->_raw_size
;
3444 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3448 /* My reading of the SVR4 ABI indicates that the
3449 procedure linkage table relocs (DT_JMPREL) should be
3450 included in the overall relocs (DT_REL). This is
3451 what Solaris does. However, UnixWare can not handle
3452 that case. Therefore, we override the DT_RELSZ entry
3453 here to make it not include the JMPREL relocs. Since
3454 the linker script arranges for .rel.plt to follow all
3455 other relocation sections, we don't have to worry
3456 about changing the DT_REL entry. */
3457 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
3460 if (s
->_cooked_size
!= 0)
3461 dyn
.d_un
.d_val
-= s
->_cooked_size
;
3463 dyn
.d_un
.d_val
-= s
->_raw_size
;
3465 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3470 /* Fill in the first entry in the procedure linkage table. */
3471 if (splt
->_raw_size
> 0)
3473 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[0], splt
->contents
+ 0);
3474 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[1], splt
->contents
+ 4);
3475 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[2], splt
->contents
+ 8);
3476 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[3], splt
->contents
+ 12);
3479 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3480 really seem like the right value. */
3481 elf_section_data (splt
->output_section
)->this_hdr
.sh_entsize
= 4;
3484 /* Fill in the first three entries in the global offset table. */
3485 if (sgot
->_raw_size
> 0)
3488 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
);
3490 bfd_put_32 (output_bfd
,
3491 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
3493 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 4);
3494 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 8);
3497 elf_section_data (sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
3503 elf32_arm_post_process_headers (abfd
, link_info
)
3505 struct bfd_link_info
* link_info ATTRIBUTE_UNUSED
;
3507 Elf_Internal_Ehdr
* i_ehdrp
; /* ELF file header, internal form. */
3509 i_ehdrp
= elf_elfheader (abfd
);
3511 i_ehdrp
->e_ident
[EI_OSABI
] = ARM_ELF_OS_ABI_VERSION
;
3512 i_ehdrp
->e_ident
[EI_ABIVERSION
] = ARM_ELF_ABI_VERSION
;
3515 static enum elf_reloc_type_class
3516 elf32_arm_reloc_type_class (rela
)
3517 const Elf_Internal_Rela
*rela
;
3519 switch ((int) ELF32_R_TYPE (rela
->r_info
))
3521 case R_ARM_RELATIVE
:
3522 return reloc_class_relative
;
3523 case R_ARM_JUMP_SLOT
:
3524 return reloc_class_plt
;
3526 return reloc_class_copy
;
3528 return reloc_class_normal
;
3533 #define ELF_ARCH bfd_arch_arm
3534 #define ELF_MACHINE_CODE EM_ARM
3535 #define ELF_MAXPAGESIZE 0x8000
3537 #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
3538 #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
3539 #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
3540 #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data
3541 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create
3542 #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
3543 #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line
3545 #define elf_backend_get_symbol_type elf32_arm_get_symbol_type
3546 #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook
3547 #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook
3548 #define elf_backend_check_relocs elf32_arm_check_relocs
3549 #define elf_backend_relocate_section elf32_arm_relocate_section
3550 #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol
3551 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
3552 #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol
3553 #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections
3554 #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections
3555 #define elf_backend_post_process_headers elf32_arm_post_process_headers
3556 #define elf_backend_reloc_type_class elf32_arm_reloc_type_class
3558 #define elf_backend_can_gc_sections 1
3559 #define elf_backend_plt_readonly 1
3560 #define elf_backend_want_got_plt 1
3561 #define elf_backend_want_plt_sym 0
3563 #define elf_backend_got_header_size 12
3564 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3566 #include "elf32-target.h"