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* bfd-in.h (bfd_get_section_limit): Define.
[deliverable/binutils-gdb.git] / bfd / coff-arm.c
1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002, 2003, 2004
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26
27 #include "coff/arm.h"
28
29 #include "coff/internal.h"
30
31 #ifdef COFF_WITH_PE
32 #include "coff/pe.h"
33 #endif
34
35 #include "libcoff.h"
36
37 /* Macros for manipulation the bits in the flags field of the coff data
38 structure. */
39 #define APCS_26_FLAG(abfd) \
40 (coff_data (abfd)->flags & F_APCS_26)
41
42 #define APCS_FLOAT_FLAG(abfd) \
43 (coff_data (abfd)->flags & F_APCS_FLOAT)
44
45 #define PIC_FLAG(abfd) \
46 (coff_data (abfd)->flags & F_PIC)
47
48 #define APCS_SET(abfd) \
49 (coff_data (abfd)->flags & F_APCS_SET)
50
51 #define SET_APCS_FLAGS(abfd, flgs) \
52 do \
53 { \
54 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
55 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
56 } \
57 while (0)
58
59 #define INTERWORK_FLAG(abfd) \
60 (coff_data (abfd)->flags & F_INTERWORK)
61
62 #define INTERWORK_SET(abfd) \
63 (coff_data (abfd)->flags & F_INTERWORK_SET)
64
65 #define SET_INTERWORK_FLAG(abfd, flg) \
66 do \
67 { \
68 coff_data (abfd)->flags &= ~F_INTERWORK; \
69 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
70 } \
71 while (0)
72
73 #ifndef NUM_ELEM
74 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
75 #endif
76
77 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
78 /* some typedefs for holding instructions */
79 typedef unsigned long int insn32;
80 typedef unsigned short int insn16;
81
82 /* Forward declarations for stupid compilers. */
83 static bfd_boolean coff_arm_relocate_section
84 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
85 struct internal_reloc *, struct internal_syment *, asection **));
86 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
87 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
88 static bfd_reloc_status_type aoutarm_fix_pcrel_26
89 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
90 #ifndef ARM_WINCE
91 static bfd_reloc_status_type coff_thumb_pcrel_23
92 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
93 static bfd_reloc_status_type coff_thumb_pcrel_9
94 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
95 static insn32 insert_thumb_branch
96 PARAMS ((insn32, int));
97 #endif
98 static bfd_reloc_status_type coff_thumb_pcrel_12
99 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
100 static bfd_reloc_status_type coff_arm_reloc
101 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
102 static bfd_boolean coff_arm_adjust_symndx
103 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
104 asection *, struct internal_reloc *, bfd_boolean *));
105 static reloc_howto_type * coff_arm_rtype_to_howto
106 PARAMS ((bfd *, asection *, struct internal_reloc *,
107 struct coff_link_hash_entry *, struct internal_syment *,
108 bfd_vma *));
109 static bfd_reloc_status_type coff_thumb_pcrel_common
110 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
111 thumb_pcrel_branchtype));
112 static const struct reloc_howto_struct * coff_arm_reloc_type_lookup
113 PARAMS ((bfd *, bfd_reloc_code_real_type));
114 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
115 PARAMS ((bfd *));
116 static struct coff_link_hash_entry * find_thumb_glue
117 PARAMS ((struct bfd_link_info *, const char *, bfd *));
118 static struct coff_link_hash_entry * find_arm_glue
119 PARAMS ((struct bfd_link_info *, const char *, bfd *));
120 #ifndef COFF_IMAGE_WITH_PE
121 static void record_arm_to_thumb_glue
122 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
123 #ifndef ARM_WINCE
124 static void record_thumb_to_arm_glue
125 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
126 #endif
127 #endif
128 static bfd_boolean coff_arm_merge_private_bfd_data
129 PARAMS ((bfd *, bfd *));
130 static bfd_boolean coff_arm_print_private_bfd_data
131 PARAMS ((bfd *, PTR));
132 static bfd_boolean _bfd_coff_arm_set_private_flags
133 PARAMS ((bfd *, flagword));
134 static bfd_boolean coff_arm_copy_private_bfd_data
135 PARAMS ((bfd *, bfd *));
136 static bfd_boolean coff_arm_is_local_label_name
137 PARAMS ((bfd *, const char *));
138 static bfd_boolean coff_arm_link_output_has_begun
139 PARAMS ((bfd *, struct coff_final_link_info *));
140 static bfd_boolean coff_arm_final_link_postscript
141 PARAMS ((bfd *, struct coff_final_link_info *));
142 static void arm_emit_base_file_entry
143 PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
144
145 /* The linker script knows the section names for placement.
146 The entry_names are used to do simple name mangling on the stubs.
147 Given a function name, and its type, the stub can be found. The
148 name can be changed. The only requirement is the %s be present. */
149
150 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
151 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
152
153 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
154 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
155
156 /* Used by the assembler. */
157
158 static bfd_reloc_status_type
159 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
160 error_message)
161 bfd *abfd;
162 arelent *reloc_entry;
163 asymbol *symbol ATTRIBUTE_UNUSED;
164 PTR data;
165 asection *input_section ATTRIBUTE_UNUSED;
166 bfd *output_bfd;
167 char **error_message ATTRIBUTE_UNUSED;
168 {
169 symvalue diff;
170 if (output_bfd == (bfd *) NULL)
171 return bfd_reloc_continue;
172
173 diff = reloc_entry->addend;
174
175 #define DOIT(x) \
176 x = ((x & ~howto->dst_mask) \
177 | (((x & howto->src_mask) + diff) & howto->dst_mask))
178
179 if (diff != 0)
180 {
181 reloc_howto_type *howto = reloc_entry->howto;
182 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
183
184 switch (howto->size)
185 {
186 case 0:
187 {
188 char x = bfd_get_8 (abfd, addr);
189 DOIT (x);
190 bfd_put_8 (abfd, x, addr);
191 }
192 break;
193
194 case 1:
195 {
196 short x = bfd_get_16 (abfd, addr);
197 DOIT (x);
198 bfd_put_16 (abfd, (bfd_vma) x, addr);
199 }
200 break;
201
202 case 2:
203 {
204 long x = bfd_get_32 (abfd, addr);
205 DOIT (x);
206 bfd_put_32 (abfd, (bfd_vma) x, addr);
207 }
208 break;
209
210 default:
211 abort ();
212 }
213 }
214
215 /* Now let bfd_perform_relocation finish everything up. */
216 return bfd_reloc_continue;
217 }
218
219 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
220 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
221 should not. */
222 #ifndef TARGET_UNDERSCORE
223 #define TARGET_UNDERSCORE '_'
224 #endif
225
226 #ifndef PCRELOFFSET
227 #define PCRELOFFSET TRUE
228 #endif
229
230 /* These most certainly belong somewhere else. Just had to get rid of
231 the manifest constants in the code. */
232 #define ARM_8 0
233 #define ARM_16 1
234 #define ARM_32 2
235 #define ARM_26 3
236 #define ARM_DISP8 4
237 #define ARM_DISP16 5
238 #define ARM_DISP32 6
239 #define ARM_26D 7
240 /* 8 is unused */
241 #define ARM_NEG16 9
242 #define ARM_NEG32 10
243 #define ARM_RVA32 11
244 #define ARM_THUMB9 12
245 #define ARM_THUMB12 13
246 #define ARM_THUMB23 14
247
248 #ifdef ARM_WINCE
249 #undef ARM_32
250 #undef ARM_RVA32
251 #undef ARM_26
252 #undef ARM_THUMB12
253 #undef ARM_26D
254
255 #define ARM_26D 0
256 #define ARM_32 1
257 #define ARM_RVA32 2
258 #define ARM_26 3
259 #define ARM_THUMB12 4
260 #define ARM_SECTION 14
261 #define ARM_SECREL 15
262 #endif
263
264 static reloc_howto_type aoutarm_std_reloc_howto[] =
265 {
266 #ifdef ARM_WINCE
267 HOWTO (ARM_26D,
268 2,
269 2,
270 24,
271 TRUE,
272 0,
273 complain_overflow_dont,
274 aoutarm_fix_pcrel_26_done,
275 "ARM_26D",
276 FALSE,
277 0x00ffffff,
278 0x0,
279 PCRELOFFSET),
280 HOWTO (ARM_32,
281 0,
282 2,
283 32,
284 FALSE,
285 0,
286 complain_overflow_bitfield,
287 coff_arm_reloc,
288 "ARM_32",
289 FALSE,
290 0xffffffff,
291 0xffffffff,
292 PCRELOFFSET),
293 HOWTO (ARM_RVA32,
294 0,
295 2,
296 32,
297 FALSE,
298 0,
299 complain_overflow_bitfield,
300 coff_arm_reloc,
301 "ARM_RVA32",
302 FALSE,
303 0xffffffff,
304 0xffffffff,
305 PCRELOFFSET),
306 HOWTO (ARM_26,
307 2,
308 2,
309 24,
310 TRUE,
311 0,
312 complain_overflow_signed,
313 aoutarm_fix_pcrel_26 ,
314 "ARM_26",
315 FALSE,
316 0x00ffffff,
317 0x00ffffff,
318 PCRELOFFSET),
319 HOWTO (ARM_THUMB12,
320 1,
321 1,
322 11,
323 TRUE,
324 0,
325 complain_overflow_signed,
326 coff_thumb_pcrel_12 ,
327 "ARM_THUMB12",
328 FALSE,
329 0x000007ff,
330 0x000007ff,
331 PCRELOFFSET),
332 EMPTY_HOWTO (-1),
333 EMPTY_HOWTO (-1),
334 EMPTY_HOWTO (-1),
335 EMPTY_HOWTO (-1),
336 EMPTY_HOWTO (-1),
337 EMPTY_HOWTO (-1),
338 EMPTY_HOWTO (-1),
339 EMPTY_HOWTO (-1),
340 EMPTY_HOWTO (-1),
341 HOWTO (ARM_SECTION,
342 0,
343 1,
344 16,
345 FALSE,
346 0,
347 complain_overflow_bitfield,
348 coff_arm_reloc,
349 "ARM_SECTION",
350 FALSE,
351 0x0000ffff,
352 0x0000ffff,
353 PCRELOFFSET),
354 HOWTO (ARM_SECREL,
355 0,
356 2,
357 32,
358 FALSE,
359 0,
360 complain_overflow_bitfield,
361 coff_arm_reloc,
362 "ARM_SECREL",
363 FALSE,
364 0xffffffff,
365 0xffffffff,
366 PCRELOFFSET),
367 #else /* not ARM_WINCE */
368 HOWTO (ARM_8, /* type */
369 0, /* rightshift */
370 0, /* size */
371 8, /* bitsize */
372 FALSE, /* pc_relative */
373 0, /* bitpos */
374 complain_overflow_bitfield, /* complain_on_overflow */
375 coff_arm_reloc, /* special_function */
376 "ARM_8", /* name */
377 TRUE, /* partial_inplace */
378 0x000000ff, /* src_mask */
379 0x000000ff, /* dst_mask */
380 PCRELOFFSET /* pcrel_offset */),
381 HOWTO (ARM_16,
382 0,
383 1,
384 16,
385 FALSE,
386 0,
387 complain_overflow_bitfield,
388 coff_arm_reloc,
389 "ARM_16",
390 TRUE,
391 0x0000ffff,
392 0x0000ffff,
393 PCRELOFFSET),
394 HOWTO (ARM_32,
395 0,
396 2,
397 32,
398 FALSE,
399 0,
400 complain_overflow_bitfield,
401 coff_arm_reloc,
402 "ARM_32",
403 TRUE,
404 0xffffffff,
405 0xffffffff,
406 PCRELOFFSET),
407 HOWTO (ARM_26,
408 2,
409 2,
410 24,
411 TRUE,
412 0,
413 complain_overflow_signed,
414 aoutarm_fix_pcrel_26 ,
415 "ARM_26",
416 FALSE,
417 0x00ffffff,
418 0x00ffffff,
419 PCRELOFFSET),
420 HOWTO (ARM_DISP8,
421 0,
422 0,
423 8,
424 TRUE,
425 0,
426 complain_overflow_signed,
427 coff_arm_reloc,
428 "ARM_DISP8",
429 TRUE,
430 0x000000ff,
431 0x000000ff,
432 TRUE),
433 HOWTO (ARM_DISP16,
434 0,
435 1,
436 16,
437 TRUE,
438 0,
439 complain_overflow_signed,
440 coff_arm_reloc,
441 "ARM_DISP16",
442 TRUE,
443 0x0000ffff,
444 0x0000ffff,
445 TRUE),
446 HOWTO (ARM_DISP32,
447 0,
448 2,
449 32,
450 TRUE,
451 0,
452 complain_overflow_signed,
453 coff_arm_reloc,
454 "ARM_DISP32",
455 TRUE,
456 0xffffffff,
457 0xffffffff,
458 TRUE),
459 HOWTO (ARM_26D,
460 2,
461 2,
462 24,
463 FALSE,
464 0,
465 complain_overflow_dont,
466 aoutarm_fix_pcrel_26_done,
467 "ARM_26D",
468 TRUE,
469 0x00ffffff,
470 0x0,
471 FALSE),
472 /* 8 is unused */
473 EMPTY_HOWTO (-1),
474 HOWTO (ARM_NEG16,
475 0,
476 -1,
477 16,
478 FALSE,
479 0,
480 complain_overflow_bitfield,
481 coff_arm_reloc,
482 "ARM_NEG16",
483 TRUE,
484 0x0000ffff,
485 0x0000ffff,
486 FALSE),
487 HOWTO (ARM_NEG32,
488 0,
489 -2,
490 32,
491 FALSE,
492 0,
493 complain_overflow_bitfield,
494 coff_arm_reloc,
495 "ARM_NEG32",
496 TRUE,
497 0xffffffff,
498 0xffffffff,
499 FALSE),
500 HOWTO (ARM_RVA32,
501 0,
502 2,
503 32,
504 FALSE,
505 0,
506 complain_overflow_bitfield,
507 coff_arm_reloc,
508 "ARM_RVA32",
509 TRUE,
510 0xffffffff,
511 0xffffffff,
512 PCRELOFFSET),
513 HOWTO (ARM_THUMB9,
514 1,
515 1,
516 8,
517 TRUE,
518 0,
519 complain_overflow_signed,
520 coff_thumb_pcrel_9 ,
521 "ARM_THUMB9",
522 FALSE,
523 0x000000ff,
524 0x000000ff,
525 PCRELOFFSET),
526 HOWTO (ARM_THUMB12,
527 1,
528 1,
529 11,
530 TRUE,
531 0,
532 complain_overflow_signed,
533 coff_thumb_pcrel_12 ,
534 "ARM_THUMB12",
535 FALSE,
536 0x000007ff,
537 0x000007ff,
538 PCRELOFFSET),
539 HOWTO (ARM_THUMB23,
540 1,
541 2,
542 22,
543 TRUE,
544 0,
545 complain_overflow_signed,
546 coff_thumb_pcrel_23 ,
547 "ARM_THUMB23",
548 FALSE,
549 0x07ff07ff,
550 0x07ff07ff,
551 PCRELOFFSET)
552 #endif /* not ARM_WINCE */
553 };
554
555 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
556
557 #ifdef COFF_WITH_PE
558 static bfd_boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
559 /* Return TRUE if this relocation should
560 appear in the output .reloc section. */
561
562 static bfd_boolean
563 in_reloc_p (abfd, howto)
564 bfd * abfd ATTRIBUTE_UNUSED;
565 reloc_howto_type * howto;
566 {
567 return !howto->pc_relative && howto->type != ARM_RVA32;
568 }
569 #endif
570
571 #define RTYPE2HOWTO(cache_ptr, dst) \
572 (cache_ptr)->howto = \
573 (dst)->r_type < NUM_RELOCS \
574 ? aoutarm_std_reloc_howto + (dst)->r_type \
575 : NULL
576
577 #define coff_rtype_to_howto coff_arm_rtype_to_howto
578
579 static reloc_howto_type *
580 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
581 bfd *abfd ATTRIBUTE_UNUSED;
582 asection *sec;
583 struct internal_reloc *rel;
584 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
585 struct internal_syment *sym ATTRIBUTE_UNUSED;
586 bfd_vma *addendp;
587 {
588 reloc_howto_type * howto;
589
590 if (rel->r_type >= NUM_RELOCS)
591 return NULL;
592
593 howto = aoutarm_std_reloc_howto + rel->r_type;
594
595 if (rel->r_type == ARM_RVA32)
596 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
597
598 return howto;
599 }
600
601 /* Used by the assembler. */
602
603 static bfd_reloc_status_type
604 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
605 output_bfd, error_message)
606 bfd *abfd ATTRIBUTE_UNUSED;
607 arelent *reloc_entry ATTRIBUTE_UNUSED;
608 asymbol *symbol ATTRIBUTE_UNUSED;
609 PTR data ATTRIBUTE_UNUSED;
610 asection *input_section ATTRIBUTE_UNUSED;
611 bfd *output_bfd ATTRIBUTE_UNUSED;
612 char **error_message ATTRIBUTE_UNUSED;
613 {
614 /* This is dead simple at present. */
615 return bfd_reloc_ok;
616 }
617
618 /* Used by the assembler. */
619
620 static bfd_reloc_status_type
621 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
622 output_bfd, error_message)
623 bfd *abfd;
624 arelent *reloc_entry;
625 asymbol *symbol;
626 PTR data;
627 asection *input_section;
628 bfd *output_bfd;
629 char **error_message ATTRIBUTE_UNUSED;
630 {
631 bfd_vma relocation;
632 bfd_size_type addr = reloc_entry->address;
633 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
634 bfd_reloc_status_type flag = bfd_reloc_ok;
635
636 /* If this is an undefined symbol, return error. */
637 if (symbol->section == &bfd_und_section
638 && (symbol->flags & BSF_WEAK) == 0)
639 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
640
641 /* If the sections are different, and we are doing a partial relocation,
642 just ignore it for now. */
643 if (symbol->section->name != input_section->name
644 && output_bfd != (bfd *)NULL)
645 return bfd_reloc_continue;
646
647 relocation = (target & 0x00ffffff) << 2;
648 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
649 relocation += symbol->value;
650 relocation += symbol->section->output_section->vma;
651 relocation += symbol->section->output_offset;
652 relocation += reloc_entry->addend;
653 relocation -= input_section->output_section->vma;
654 relocation -= input_section->output_offset;
655 relocation -= addr;
656
657 if (relocation & 3)
658 return bfd_reloc_overflow;
659
660 /* Check for overflow. */
661 if (relocation & 0x02000000)
662 {
663 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
664 flag = bfd_reloc_overflow;
665 }
666 else if (relocation & ~(bfd_vma) 0x03ffffff)
667 flag = bfd_reloc_overflow;
668
669 target &= ~0x00ffffff;
670 target |= (relocation >> 2) & 0x00ffffff;
671 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
672
673 /* Now the ARM magic... Change the reloc type so that it is marked as done.
674 Strictly this is only necessary if we are doing a partial relocation. */
675 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
676
677 return flag;
678 }
679
680 static bfd_reloc_status_type
681 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
682 output_bfd, error_message, btype)
683 bfd *abfd;
684 arelent *reloc_entry;
685 asymbol *symbol;
686 PTR data;
687 asection *input_section;
688 bfd *output_bfd;
689 char **error_message ATTRIBUTE_UNUSED;
690 thumb_pcrel_branchtype btype;
691 {
692 bfd_vma relocation = 0;
693 bfd_size_type addr = reloc_entry->address;
694 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
695 bfd_reloc_status_type flag = bfd_reloc_ok;
696 bfd_vma dstmsk;
697 bfd_vma offmsk;
698 bfd_vma signbit;
699
700 /* NOTE: This routine is currently used by GAS, but not by the link
701 phase. */
702
703 switch (btype)
704 {
705 case b9:
706 dstmsk = 0x000000ff;
707 offmsk = 0x000001fe;
708 signbit = 0x00000100;
709 break;
710
711 case b12:
712 dstmsk = 0x000007ff;
713 offmsk = 0x00000ffe;
714 signbit = 0x00000800;
715 break;
716
717 case b23:
718 dstmsk = 0x07ff07ff;
719 offmsk = 0x007fffff;
720 signbit = 0x00400000;
721 break;
722
723 default:
724 abort ();
725 }
726
727 /* If this is an undefined symbol, return error. */
728 if (symbol->section == &bfd_und_section
729 && (symbol->flags & BSF_WEAK) == 0)
730 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
731
732 /* If the sections are different, and we are doing a partial relocation,
733 just ignore it for now. */
734 if (symbol->section->name != input_section->name
735 && output_bfd != (bfd *)NULL)
736 return bfd_reloc_continue;
737
738 switch (btype)
739 {
740 case b9:
741 case b12:
742 relocation = ((target & dstmsk) << 1);
743 break;
744
745 case b23:
746 if (bfd_big_endian (abfd))
747 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
748 else
749 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
750 break;
751
752 default:
753 abort ();
754 }
755
756 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
757 relocation += symbol->value;
758 relocation += symbol->section->output_section->vma;
759 relocation += symbol->section->output_offset;
760 relocation += reloc_entry->addend;
761 relocation -= input_section->output_section->vma;
762 relocation -= input_section->output_offset;
763 relocation -= addr;
764
765 if (relocation & 1)
766 return bfd_reloc_overflow;
767
768 /* Check for overflow. */
769 if (relocation & signbit)
770 {
771 if ((relocation & ~offmsk) != ~offmsk)
772 flag = bfd_reloc_overflow;
773 }
774 else if (relocation & ~offmsk)
775 flag = bfd_reloc_overflow;
776
777 target &= ~dstmsk;
778 switch (btype)
779 {
780 case b9:
781 case b12:
782 target |= (relocation >> 1);
783 break;
784
785 case b23:
786 if (bfd_big_endian (abfd))
787 target |= (((relocation & 0xfff) >> 1)
788 | ((relocation << 4) & 0x07ff0000));
789 else
790 target |= (((relocation & 0xffe) << 15)
791 | ((relocation >> 12) & 0x7ff));
792 break;
793
794 default:
795 abort ();
796 }
797
798 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
799
800 /* Now the ARM magic... Change the reloc type so that it is marked as done.
801 Strictly this is only necessary if we are doing a partial relocation. */
802 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
803
804 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
805 return flag;
806 }
807
808 #ifndef ARM_WINCE
809 static bfd_reloc_status_type
810 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
811 output_bfd, error_message)
812 bfd *abfd;
813 arelent *reloc_entry;
814 asymbol *symbol;
815 PTR data;
816 asection *input_section;
817 bfd *output_bfd;
818 char **error_message;
819 {
820 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
821 input_section, output_bfd, error_message,
822 b23);
823 }
824
825 static bfd_reloc_status_type
826 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
827 output_bfd, error_message)
828 bfd *abfd;
829 arelent *reloc_entry;
830 asymbol *symbol;
831 PTR data;
832 asection *input_section;
833 bfd *output_bfd;
834 char **error_message;
835 {
836 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
837 input_section, output_bfd, error_message,
838 b9);
839 }
840 #endif /* not ARM_WINCE */
841
842 static bfd_reloc_status_type
843 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
844 output_bfd, error_message)
845 bfd *abfd;
846 arelent *reloc_entry;
847 asymbol *symbol;
848 PTR data;
849 asection *input_section;
850 bfd *output_bfd;
851 char **error_message;
852 {
853 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
854 input_section, output_bfd, error_message,
855 b12);
856 }
857
858 static const struct reloc_howto_struct *
859 coff_arm_reloc_type_lookup (abfd, code)
860 bfd * abfd;
861 bfd_reloc_code_real_type code;
862 {
863 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
864
865 if (code == BFD_RELOC_CTOR)
866 switch (bfd_get_arch_info (abfd)->bits_per_address)
867 {
868 case 32:
869 code = BFD_RELOC_32;
870 break;
871 default:
872 return (const struct reloc_howto_struct *) 0;
873 }
874
875 switch (code)
876 {
877 #ifdef ARM_WINCE
878 ASTD (BFD_RELOC_32, ARM_32);
879 ASTD (BFD_RELOC_RVA, ARM_RVA32);
880 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
881 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
882 #else
883 ASTD (BFD_RELOC_8, ARM_8);
884 ASTD (BFD_RELOC_16, ARM_16);
885 ASTD (BFD_RELOC_32, ARM_32);
886 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
887 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
888 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
889 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
890 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
891 ASTD (BFD_RELOC_RVA, ARM_RVA32);
892 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
893 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
894 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
895 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
896 #endif
897 default: return (const struct reloc_howto_struct *) 0;
898 }
899 }
900
901 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
902 #define COFF_PAGE_SIZE 0x1000
903 /* Turn a howto into a reloc nunmber */
904
905 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
906 #define BADMAG(x) ARMBADMAG(x)
907 #define ARM 1 /* Customize coffcode.h */
908
909 #ifndef ARM_WINCE
910 /* Make sure that the 'r_offset' field is copied properly
911 so that identical binaries will compare the same. */
912 #define SWAP_IN_RELOC_OFFSET H_GET_32
913 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
914 #endif
915
916 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
917 This allows us to store global data here without actually creating any
918 global variables, which is a no-no in the BFD world. */
919 struct coff_arm_link_hash_table
920 {
921 /* The original coff_link_hash_table structure. MUST be first field. */
922 struct coff_link_hash_table root;
923
924 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
925 bfd_size_type thumb_glue_size;
926
927 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
928 bfd_size_type arm_glue_size;
929
930 /* An arbitrary input BFD chosen to hold the glue sections. */
931 bfd * bfd_of_glue_owner;
932
933 /* Support interworking with old, non-interworking aware ARM code. */
934 int support_old_code;
935 };
936
937 /* Get the ARM coff linker hash table from a link_info structure. */
938 #define coff_arm_hash_table(info) \
939 ((struct coff_arm_link_hash_table *) ((info)->hash))
940
941 /* Create an ARM coff linker hash table. */
942
943 static struct bfd_link_hash_table *
944 coff_arm_link_hash_table_create (abfd)
945 bfd * abfd;
946 {
947 struct coff_arm_link_hash_table * ret;
948 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
949
950 ret = (struct coff_arm_link_hash_table *) bfd_malloc (amt);
951 if (ret == (struct coff_arm_link_hash_table *) NULL)
952 return NULL;
953
954 if (! _bfd_coff_link_hash_table_init
955 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
956 {
957 free (ret);
958 return (struct bfd_link_hash_table *) NULL;
959 }
960
961 ret->thumb_glue_size = 0;
962 ret->arm_glue_size = 0;
963 ret->bfd_of_glue_owner = NULL;
964
965 return & ret->root.root;
966 }
967
968 static void
969 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
970 struct bfd_link_info *info;
971 bfd *output_bfd;
972 asection *input_section;
973 bfd_vma reloc_offset;
974 {
975 bfd_vma addr = reloc_offset
976 - input_section->vma
977 + input_section->output_offset
978 + input_section->output_section->vma;
979
980 if (coff_data (output_bfd)->pe)
981 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
982 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
983
984 }
985 \f
986 #ifndef ARM_WINCE
987 /* The thumb form of a long branch is a bit finicky, because the offset
988 encoding is split over two fields, each in it's own instruction. They
989 can occur in any order. So given a thumb form of long branch, and an
990 offset, insert the offset into the thumb branch and return finished
991 instruction.
992
993 It takes two thumb instructions to encode the target address. Each has
994 11 bits to invest. The upper 11 bits are stored in one (identified by
995 H-0.. see below), the lower 11 bits are stored in the other (identified
996 by H-1).
997
998 Combine together and shifted left by 1 (it's a half word address) and
999 there you have it.
1000
1001 Op: 1111 = F,
1002 H-0, upper address-0 = 000
1003 Op: 1111 = F,
1004 H-1, lower address-0 = 800
1005
1006 They can be ordered either way, but the arm tools I've seen always put
1007 the lower one first. It probably doesn't matter. krk@cygnus.com
1008
1009 XXX: Actually the order does matter. The second instruction (H-1)
1010 moves the computed address into the PC, so it must be the second one
1011 in the sequence. The problem, however is that whilst little endian code
1012 stores the instructions in HI then LOW order, big endian code does the
1013 reverse. nickc@cygnus.com. */
1014
1015 #define LOW_HI_ORDER 0xF800F000
1016 #define HI_LOW_ORDER 0xF000F800
1017
1018 static insn32
1019 insert_thumb_branch (br_insn, rel_off)
1020 insn32 br_insn;
1021 int rel_off;
1022 {
1023 unsigned int low_bits;
1024 unsigned int high_bits;
1025
1026 BFD_ASSERT((rel_off & 1) != 1);
1027
1028 rel_off >>= 1; /* half word aligned address */
1029 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
1030 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
1031
1032 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1033 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1034 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1035 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1036 else
1037 /* FIXME: the BFD library should never abort except for internal errors
1038 - it should return an error status. */
1039 abort (); /* Error - not a valid branch instruction form. */
1040
1041 return br_insn;
1042 }
1043
1044 \f
1045 static struct coff_link_hash_entry *
1046 find_thumb_glue (info, name, input_bfd)
1047 struct bfd_link_info *info;
1048 const char *name;
1049 bfd *input_bfd;
1050 {
1051 char *tmp_name;
1052 struct coff_link_hash_entry *myh;
1053 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1054
1055 tmp_name = (char *) bfd_malloc (amt);
1056
1057 BFD_ASSERT (tmp_name);
1058
1059 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1060
1061 myh = coff_link_hash_lookup
1062 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1063
1064 if (myh == NULL)
1065 /* xgettext:c-format */
1066 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1067 bfd_archive_filename (input_bfd), tmp_name, name);
1068
1069 free (tmp_name);
1070
1071 return myh;
1072 }
1073 #endif /* not ARM_WINCE */
1074
1075 static struct coff_link_hash_entry *
1076 find_arm_glue (info, name, input_bfd)
1077 struct bfd_link_info *info;
1078 const char *name;
1079 bfd *input_bfd;
1080 {
1081 char *tmp_name;
1082 struct coff_link_hash_entry * myh;
1083 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1084
1085 tmp_name = (char *) bfd_malloc (amt);
1086
1087 BFD_ASSERT (tmp_name);
1088
1089 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1090
1091 myh = coff_link_hash_lookup
1092 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1093
1094 if (myh == NULL)
1095 /* xgettext:c-format */
1096 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1097 bfd_archive_filename (input_bfd), tmp_name, name);
1098
1099 free (tmp_name);
1100
1101 return myh;
1102 }
1103
1104 /*
1105 ARM->Thumb glue:
1106
1107 .arm
1108 __func_from_arm:
1109 ldr r12, __func_addr
1110 bx r12
1111 __func_addr:
1112 .word func @ behave as if you saw a ARM_32 reloc
1113 */
1114
1115 #define ARM2THUMB_GLUE_SIZE 12
1116 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1117 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1118 static const insn32 a2t3_func_addr_insn = 0x00000001;
1119
1120 /*
1121 Thumb->ARM: Thumb->(non-interworking aware) ARM
1122
1123 .thumb .thumb
1124 .align 2 .align 2
1125 __func_from_thumb: __func_from_thumb:
1126 bx pc push {r6, lr}
1127 nop ldr r6, __func_addr
1128 .arm mov lr, pc
1129 __func_change_to_arm: bx r6
1130 b func .arm
1131 __func_back_to_thumb:
1132 ldmia r13! {r6, lr}
1133 bx lr
1134 __func_addr:
1135 .word func
1136 */
1137
1138 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1139 static const insn16 t2a1_bx_pc_insn = 0x4778;
1140 static const insn16 t2a2_noop_insn = 0x46c0;
1141 static const insn32 t2a3_b_insn = 0xea000000;
1142
1143 static const insn16 t2a1_push_insn = 0xb540;
1144 static const insn16 t2a2_ldr_insn = 0x4e03;
1145 static const insn16 t2a3_mov_insn = 0x46fe;
1146 static const insn16 t2a4_bx_insn = 0x4730;
1147 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1148 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1149
1150 /* TODO:
1151 We should really create new local (static) symbols in destination
1152 object for each stub we create. We should also create local
1153 (static) symbols within the stubs when switching between ARM and
1154 Thumb code. This will ensure that the debugger and disassembler
1155 can present a better view of stubs.
1156
1157 We can treat stubs like literal sections, and for the THUMB9 ones
1158 (short addressing range) we should be able to insert the stubs
1159 between sections. i.e. the simplest approach (since relocations
1160 are done on a section basis) is to dump the stubs at the end of
1161 processing a section. That way we can always try and minimise the
1162 offset to and from a stub. However, this does not map well onto
1163 the way that the linker/BFD does its work: mapping all input
1164 sections to output sections via the linker script before doing
1165 all the processing.
1166
1167 Unfortunately it may be easier to just to disallow short range
1168 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1169 only branch-and-link (BL) calls. This will simplify the processing
1170 since we can then put all of the stubs into their own section.
1171
1172 TODO:
1173 On a different subject, rather than complaining when a
1174 branch cannot fit in the number of bits available for the
1175 instruction we should generate a trampoline stub (needed to
1176 address the complete 32bit address space). */
1177
1178 /* The standard COFF backend linker does not cope with the special
1179 Thumb BRANCH23 relocation. The alternative would be to split the
1180 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1181 bit simpler simply providing our own relocation driver. */
1182
1183 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1184 This code is a very slightly modified copy of
1185 _bfd_coff_generic_relocate_section. It would be a much more
1186 maintainable solution to have a MACRO that could be expanded within
1187 _bfd_coff_generic_relocate_section that would only be provided for
1188 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1189 is different from the original. */
1190
1191 static bfd_boolean
1192 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1193 contents, relocs, syms, sections)
1194 bfd *output_bfd;
1195 struct bfd_link_info *info;
1196 bfd *input_bfd;
1197 asection *input_section;
1198 bfd_byte *contents;
1199 struct internal_reloc *relocs;
1200 struct internal_syment *syms;
1201 asection **sections;
1202 {
1203 struct internal_reloc * rel;
1204 struct internal_reloc * relend;
1205 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1206
1207 rel = relocs;
1208 relend = rel + input_section->reloc_count;
1209
1210 for (; rel < relend; rel++)
1211 {
1212 int done = 0;
1213 long symndx;
1214 struct coff_link_hash_entry * h;
1215 struct internal_syment * sym;
1216 bfd_vma addend;
1217 bfd_vma val;
1218 reloc_howto_type * howto;
1219 bfd_reloc_status_type rstat;
1220 bfd_vma h_val;
1221
1222 symndx = rel->r_symndx;
1223
1224 if (symndx == -1)
1225 {
1226 h = NULL;
1227 sym = NULL;
1228 }
1229 else
1230 {
1231 h = obj_coff_sym_hashes (input_bfd)[symndx];
1232 sym = syms + symndx;
1233 }
1234
1235 /* COFF treats common symbols in one of two ways. Either the
1236 size of the symbol is included in the section contents, or it
1237 is not. We assume that the size is not included, and force
1238 the rtype_to_howto function to adjust the addend as needed. */
1239
1240 if (sym != NULL && sym->n_scnum != 0)
1241 addend = - sym->n_value;
1242 else
1243 addend = 0;
1244
1245 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1246 sym, &addend);
1247 if (howto == NULL)
1248 return FALSE;
1249
1250 /* The relocation_section function will skip pcrel_offset relocs
1251 when doing a relocatable link. However, we want to convert
1252 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1253 this case without pcrel_offset set, and adjust the addend to
1254 compensate. 'partial_inplace' is also set, since we want 'done'
1255 relocations to be reflected in section's data. */
1256 if (rel->r_type == ARM_26
1257 && h != NULL
1258 && info->relocatable
1259 && (h->root.type == bfd_link_hash_defined
1260 || h->root.type == bfd_link_hash_defweak)
1261 && (h->root.u.def.section->output_section
1262 == input_section->output_section))
1263 {
1264 static reloc_howto_type fake_arm26_reloc =
1265 HOWTO (ARM_26,
1266 2,
1267 2,
1268 24,
1269 TRUE,
1270 0,
1271 complain_overflow_signed,
1272 aoutarm_fix_pcrel_26 ,
1273 "ARM_26",
1274 TRUE,
1275 0x00ffffff,
1276 0x00ffffff,
1277 FALSE);
1278
1279 addend -= rel->r_vaddr - input_section->vma;
1280 #ifdef ARM_WINCE
1281 /* FIXME: I don't know why, but the hack is necessary for correct
1282 generation of bl's instruction offset. */
1283 addend -= 8;
1284 #endif
1285 howto = &fake_arm26_reloc;
1286 }
1287
1288 #ifdef ARM_WINCE
1289 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1290 the next opcode's pc, so is off by one. */
1291 #if 0 /* This appears to have been true for WINCE 2.0, but it is not
1292 true for WINCE 3.0. */
1293 if (howto->pc_relative && !info->relocatable)
1294 addend -= 8;
1295 #endif
1296 #endif
1297
1298 /* If we are doing a relocatable link, then we can just ignore
1299 a PC relative reloc that is pcrel_offset. It will already
1300 have the correct value. If this is not a relocatable link,
1301 then we should ignore the symbol value. */
1302 if (howto->pc_relative && howto->pcrel_offset)
1303 {
1304 if (info->relocatable)
1305 continue;
1306 /* FIXME - it is not clear which targets need this next test
1307 and which do not. It is known that it is needed for the
1308 VxWorks and EPOC-PE targets, but it is also known that it
1309 was suppressed for other ARM targets. This ought to be
1310 sorted out one day. */
1311 #ifdef ARM_COFF_BUGFIX
1312 /* We must not ignore the symbol value. If the symbol is
1313 within the same section, the relocation should have already
1314 been fixed, but if it is not, we'll be handed a reloc into
1315 the beginning of the symbol's section, so we must not cancel
1316 out the symbol's value, otherwise we'll be adding it in
1317 twice. */
1318 if (sym != NULL && sym->n_scnum != 0)
1319 addend += sym->n_value;
1320 #endif
1321 }
1322
1323 val = 0;
1324
1325 if (h == NULL)
1326 {
1327 asection *sec;
1328
1329 if (symndx == -1)
1330 {
1331 sec = bfd_abs_section_ptr;
1332 val = 0;
1333 }
1334 else
1335 {
1336 sec = sections[symndx];
1337 val = (sec->output_section->vma
1338 + sec->output_offset
1339 + sym->n_value
1340 - sec->vma);
1341 }
1342 }
1343 else
1344 {
1345 #if 1 /* THUMBEXTENSION */
1346 /* We don't output the stubs if we are generating a
1347 relocatable output file, since we may as well leave the
1348 stub generation to the final linker pass. If we fail to
1349 verify that the name is defined, we'll try to build stubs
1350 for an undefined name... */
1351 if (! info->relocatable
1352 && ( h->root.type == bfd_link_hash_defined
1353 || h->root.type == bfd_link_hash_defweak))
1354 {
1355 asection * h_sec = h->root.u.def.section;
1356 const char * name = h->root.root.string;
1357
1358 /* h locates the symbol referenced in the reloc. */
1359 h_val = (h->root.u.def.value
1360 + h_sec->output_section->vma
1361 + h_sec->output_offset);
1362
1363 if (howto->type == ARM_26)
1364 {
1365 if ( h->class == C_THUMBSTATFUNC
1366 || h->class == C_THUMBEXTFUNC)
1367 {
1368 /* Arm code calling a Thumb function. */
1369 unsigned long int tmp;
1370 bfd_vma my_offset;
1371 asection * s;
1372 long int ret_offset;
1373 struct coff_link_hash_entry * myh;
1374 struct coff_arm_link_hash_table * globals;
1375
1376 myh = find_arm_glue (info, name, input_bfd);
1377 if (myh == NULL)
1378 return FALSE;
1379
1380 globals = coff_arm_hash_table (info);
1381
1382 BFD_ASSERT (globals != NULL);
1383 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1384
1385 my_offset = myh->root.u.def.value;
1386
1387 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1388 ARM2THUMB_GLUE_SECTION_NAME);
1389 BFD_ASSERT (s != NULL);
1390 BFD_ASSERT (s->contents != NULL);
1391 BFD_ASSERT (s->output_section != NULL);
1392
1393 if ((my_offset & 0x01) == 0x01)
1394 {
1395 if (h_sec->owner != NULL
1396 && INTERWORK_SET (h_sec->owner)
1397 && ! INTERWORK_FLAG (h_sec->owner))
1398 {
1399 _bfd_error_handler
1400 /* xgettext:c-format */
1401 (_("%s(%s): warning: interworking not enabled."),
1402 bfd_archive_filename (h_sec->owner), name);
1403 _bfd_error_handler
1404 /* xgettext:c-format */
1405 (_(" first occurrence: %s: arm call to thumb"),
1406 bfd_archive_filename (input_bfd));
1407 }
1408
1409 --my_offset;
1410 myh->root.u.def.value = my_offset;
1411
1412 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1413 s->contents + my_offset);
1414
1415 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1416 s->contents + my_offset + 4);
1417
1418 /* It's a thumb address. Add the low order bit. */
1419 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1420 s->contents + my_offset + 8);
1421
1422 if (info->base_file)
1423 arm_emit_base_file_entry (info, output_bfd, s,
1424 my_offset + 8);
1425
1426 }
1427
1428 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1429
1430 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1431 - input_section->vma);
1432
1433 tmp = tmp & 0xFF000000;
1434
1435 /* Somehow these are both 4 too far, so subtract 8. */
1436 ret_offset =
1437 s->output_offset
1438 + my_offset
1439 + s->output_section->vma
1440 - (input_section->output_offset
1441 + input_section->output_section->vma
1442 + rel->r_vaddr)
1443 - 8;
1444
1445 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1446
1447 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1448 contents + rel->r_vaddr - input_section->vma);
1449 done = 1;
1450 }
1451 }
1452
1453 #ifndef ARM_WINCE
1454 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1455 else if (howto->type == ARM_THUMB23)
1456 {
1457 if ( h->class == C_EXT
1458 || h->class == C_STAT
1459 || h->class == C_LABEL)
1460 {
1461 /* Thumb code calling an ARM function */
1462 asection * s = 0;
1463 bfd_vma my_offset;
1464 unsigned long int tmp;
1465 long int ret_offset;
1466 struct coff_link_hash_entry * myh;
1467 struct coff_arm_link_hash_table * globals;
1468
1469 myh = find_thumb_glue (info, name, input_bfd);
1470 if (myh == NULL)
1471 return FALSE;
1472
1473 globals = coff_arm_hash_table (info);
1474
1475 BFD_ASSERT (globals != NULL);
1476 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1477
1478 my_offset = myh->root.u.def.value;
1479
1480 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1481 THUMB2ARM_GLUE_SECTION_NAME);
1482
1483 BFD_ASSERT (s != NULL);
1484 BFD_ASSERT (s->contents != NULL);
1485 BFD_ASSERT (s->output_section != NULL);
1486
1487 if ((my_offset & 0x01) == 0x01)
1488 {
1489 if (h_sec->owner != NULL
1490 && INTERWORK_SET (h_sec->owner)
1491 && ! INTERWORK_FLAG (h_sec->owner)
1492 && ! globals->support_old_code)
1493 {
1494 _bfd_error_handler
1495 /* xgettext:c-format */
1496 (_("%s(%s): warning: interworking not enabled."),
1497 bfd_archive_filename (h_sec->owner), name);
1498 _bfd_error_handler
1499 /* xgettext:c-format */
1500 (_(" first occurrence: %s: thumb call to arm"),
1501 bfd_archive_filename (input_bfd));
1502 _bfd_error_handler
1503 (_(" consider relinking with --support-old-code enabled"));
1504 }
1505
1506 -- my_offset;
1507 myh->root.u.def.value = my_offset;
1508
1509 if (globals->support_old_code)
1510 {
1511 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1512 s->contents + my_offset);
1513
1514 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1515 s->contents + my_offset + 2);
1516
1517 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1518 s->contents + my_offset + 4);
1519
1520 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1521 s->contents + my_offset + 6);
1522
1523 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1524 s->contents + my_offset + 8);
1525
1526 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1527 s->contents + my_offset + 12);
1528
1529 /* Store the address of the function in the last word of the stub. */
1530 bfd_put_32 (output_bfd, h_val,
1531 s->contents + my_offset + 16);
1532
1533 if (info->base_file)
1534 arm_emit_base_file_entry (info, output_bfd, s,
1535 my_offset + 16);
1536 }
1537 else
1538 {
1539 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1540 s->contents + my_offset);
1541
1542 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1543 s->contents + my_offset + 2);
1544
1545 ret_offset =
1546 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1547 - ((bfd_signed_vma)
1548 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1549 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1550 + s->output_section->vma) /* Address of the start of the current section. */
1551 + 4 /* The branch instruction is 4 bytes into the stub. */
1552 + 8); /* ARM branches work from the pc of the instruction + 8. */
1553
1554 bfd_put_32 (output_bfd,
1555 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1556 s->contents + my_offset + 4);
1557
1558 }
1559 }
1560
1561 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1562
1563 /* Now go back and fix up the original BL insn to point
1564 to here. */
1565 ret_offset =
1566 s->output_offset
1567 + my_offset
1568 - (input_section->output_offset
1569 + rel->r_vaddr)
1570 -4;
1571
1572 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1573 - input_section->vma);
1574
1575 bfd_put_32 (output_bfd,
1576 (bfd_vma) insert_thumb_branch (tmp,
1577 ret_offset),
1578 contents + rel->r_vaddr - input_section->vma);
1579
1580 done = 1;
1581 }
1582 }
1583 #endif
1584 }
1585
1586 /* If the relocation type and destination symbol does not
1587 fall into one of the above categories, then we can just
1588 perform a direct link. */
1589
1590 if (done)
1591 rstat = bfd_reloc_ok;
1592 else
1593 #endif /* THUMBEXTENSION */
1594 if ( h->root.type == bfd_link_hash_defined
1595 || h->root.type == bfd_link_hash_defweak)
1596 {
1597 asection *sec;
1598
1599 sec = h->root.u.def.section;
1600 val = (h->root.u.def.value
1601 + sec->output_section->vma
1602 + sec->output_offset);
1603 }
1604
1605 else if (! info->relocatable)
1606 {
1607 if (! ((*info->callbacks->undefined_symbol)
1608 (info, h->root.root.string, input_bfd, input_section,
1609 rel->r_vaddr - input_section->vma, TRUE)))
1610 return FALSE;
1611 }
1612 }
1613
1614 if (info->base_file)
1615 {
1616 /* Emit a reloc if the backend thinks it needs it. */
1617 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1618 arm_emit_base_file_entry (info, output_bfd, input_section,
1619 rel->r_vaddr);
1620 }
1621
1622 #if 1 /* THUMBEXTENSION */
1623 if (done)
1624 rstat = bfd_reloc_ok;
1625 #ifndef ARM_WINCE
1626 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1627 else if (! info->relocatable
1628 && howto->type == ARM_THUMB23)
1629 {
1630 /* This is pretty much a copy of what the default
1631 _bfd_final_link_relocate and _bfd_relocate_contents
1632 routines do to perform a relocation, with special
1633 processing for the split addressing of the Thumb BL
1634 instruction. Again, it would probably be simpler adding a
1635 ThumbBRANCH23 specific macro expansion into the default
1636 code. */
1637
1638 bfd_vma address = rel->r_vaddr - input_section->vma;
1639
1640 if (address > high_address)
1641 rstat = bfd_reloc_outofrange;
1642 else
1643 {
1644 bfd_vma relocation = val + addend;
1645 int size = bfd_get_reloc_size (howto);
1646 bfd_boolean overflow = FALSE;
1647 bfd_byte *location = contents + address;
1648 bfd_vma x = bfd_get_32 (input_bfd, location);
1649 bfd_vma src_mask = 0x007FFFFE;
1650 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1651 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1652 bfd_vma check;
1653 bfd_signed_vma signed_check;
1654 bfd_vma add;
1655 bfd_signed_vma signed_add;
1656
1657 BFD_ASSERT (size == 4);
1658
1659 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1660 relocation -= (input_section->output_section->vma
1661 + input_section->output_offset);
1662
1663 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1664 relocation -= address;
1665
1666 /* No need to negate the relocation with BRANCH23. */
1667 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1668 /* howto->rightshift == 1 */
1669
1670 /* Drop unwanted bits from the value we are relocating to. */
1671 check = relocation >> howto->rightshift;
1672
1673 /* If this is a signed value, the rightshift just dropped
1674 leading 1 bits (assuming twos complement). */
1675 if ((bfd_signed_vma) relocation >= 0)
1676 signed_check = check;
1677 else
1678 signed_check = (check
1679 | ((bfd_vma) - 1
1680 & ~((bfd_vma) - 1 >> howto->rightshift)));
1681
1682 /* Get the value from the object file. */
1683 if (bfd_big_endian (input_bfd))
1684 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1685 else
1686 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1687
1688 /* Get the value from the object file with an appropriate sign.
1689 The expression involving howto->src_mask isolates the upper
1690 bit of src_mask. If that bit is set in the value we are
1691 adding, it is negative, and we subtract out that number times
1692 two. If src_mask includes the highest possible bit, then we
1693 can not get the upper bit, but that does not matter since
1694 signed_add needs no adjustment to become negative in that
1695 case. */
1696 signed_add = add;
1697
1698 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1699 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1700
1701 /* howto->bitpos == 0 */
1702 /* Add the value from the object file, shifted so that it is a
1703 straight number. */
1704 signed_check += signed_add;
1705 relocation += signed_add;
1706
1707 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1708
1709 /* Assumes two's complement. */
1710 if ( signed_check > reloc_signed_max
1711 || signed_check < reloc_signed_min)
1712 overflow = TRUE;
1713
1714 /* Put the relocation into the correct bits.
1715 For a BLX instruction, make sure that the relocation is rounded up
1716 to a word boundary. This follows the semantics of the instruction
1717 which specifies that bit 1 of the target address will come from bit
1718 1 of the base address. */
1719 if (bfd_big_endian (input_bfd))
1720 {
1721 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1722 relocation += 2;
1723 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1724 }
1725 else
1726 {
1727 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1728 relocation += 2;
1729 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1730 }
1731
1732 /* Add the relocation to the correct bits of X. */
1733 x = ((x & ~howto->dst_mask) | relocation);
1734
1735 /* Put the relocated value back in the object file. */
1736 bfd_put_32 (input_bfd, x, location);
1737
1738 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1739 }
1740 }
1741 #endif
1742 else
1743 #endif /* THUMBEXTENSION */
1744 if (info->relocatable && ! howto->partial_inplace)
1745 rstat = bfd_reloc_ok;
1746 else
1747 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1748 contents,
1749 rel->r_vaddr - input_section->vma,
1750 val, addend);
1751 #if 1 /* THUMBEXTENSION */
1752 /* FIXME:
1753 Is this the best way to fix up thumb addresses? krk@cygnus.com
1754 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1755 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1756 if (! info->relocatable
1757 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1758 {
1759 /* Determine if we need to set the bottom bit of a relocated address
1760 because the address is the address of a Thumb code symbol. */
1761
1762 int patchit = FALSE;
1763
1764 if (h != NULL
1765 && ( h->class == C_THUMBSTATFUNC
1766 || h->class == C_THUMBEXTFUNC))
1767 {
1768 patchit = TRUE;
1769 }
1770 else if (sym != NULL
1771 && sym->n_scnum > N_UNDEF)
1772 {
1773 /* No hash entry - use the symbol instead. */
1774
1775 if ( sym->n_sclass == C_THUMBSTATFUNC
1776 || sym->n_sclass == C_THUMBEXTFUNC)
1777 patchit = TRUE;
1778 }
1779
1780 if (patchit)
1781 {
1782 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1783 bfd_vma x = bfd_get_32 (input_bfd, location);
1784
1785 bfd_put_32 (input_bfd, x | 1, location);
1786 }
1787 }
1788 #endif /* THUMBEXTENSION */
1789
1790 switch (rstat)
1791 {
1792 default:
1793 abort ();
1794 case bfd_reloc_ok:
1795 break;
1796 case bfd_reloc_outofrange:
1797 (*_bfd_error_handler)
1798 (_("%s: bad reloc address 0x%lx in section `%s'"),
1799 bfd_archive_filename (input_bfd),
1800 (unsigned long) rel->r_vaddr,
1801 bfd_get_section_name (input_bfd, input_section));
1802 return FALSE;
1803 case bfd_reloc_overflow:
1804 {
1805 const char *name;
1806 char buf[SYMNMLEN + 1];
1807
1808 if (symndx == -1)
1809 name = "*ABS*";
1810 else if (h != NULL)
1811 name = h->root.root.string;
1812 else
1813 {
1814 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1815 if (name == NULL)
1816 return FALSE;
1817 }
1818
1819 if (! ((*info->callbacks->reloc_overflow)
1820 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1821 input_section, rel->r_vaddr - input_section->vma)))
1822 return FALSE;
1823 }
1824 }
1825 }
1826
1827 return TRUE;
1828 }
1829
1830 #ifndef COFF_IMAGE_WITH_PE
1831
1832 bfd_boolean
1833 bfd_arm_allocate_interworking_sections (info)
1834 struct bfd_link_info * info;
1835 {
1836 asection * s;
1837 bfd_byte * foo;
1838 struct coff_arm_link_hash_table * globals;
1839 #if 0
1840 static char test_char = '1';
1841 #endif
1842
1843 globals = coff_arm_hash_table (info);
1844
1845 BFD_ASSERT (globals != NULL);
1846
1847 if (globals->arm_glue_size != 0)
1848 {
1849 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1850
1851 s = bfd_get_section_by_name
1852 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1853
1854 BFD_ASSERT (s != NULL);
1855
1856 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1857 globals->arm_glue_size);
1858 #if 0
1859 memset (foo, test_char, (size_t) globals->arm_glue_size);
1860 #endif
1861
1862 s->size = globals->arm_glue_size;
1863 s->contents = foo;
1864 }
1865
1866 if (globals->thumb_glue_size != 0)
1867 {
1868 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1869
1870 s = bfd_get_section_by_name
1871 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1872
1873 BFD_ASSERT (s != NULL);
1874
1875 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1876 globals->thumb_glue_size);
1877 #if 0
1878 memset (foo, test_char, (size_t) globals->thumb_glue_size);
1879 #endif
1880
1881 s->size = globals->thumb_glue_size;
1882 s->contents = foo;
1883 }
1884
1885 return TRUE;
1886 }
1887
1888 static void
1889 record_arm_to_thumb_glue (info, h)
1890 struct bfd_link_info * info;
1891 struct coff_link_hash_entry * h;
1892 {
1893 const char * name = h->root.root.string;
1894 register asection * s;
1895 char * tmp_name;
1896 struct coff_link_hash_entry * myh;
1897 struct bfd_link_hash_entry * bh;
1898 struct coff_arm_link_hash_table * globals;
1899 bfd_vma val;
1900 bfd_size_type amt;
1901
1902 globals = coff_arm_hash_table (info);
1903
1904 BFD_ASSERT (globals != NULL);
1905 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1906
1907 s = bfd_get_section_by_name
1908 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1909
1910 BFD_ASSERT (s != NULL);
1911
1912 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1913 tmp_name = (char *) bfd_malloc (amt);
1914
1915 BFD_ASSERT (tmp_name);
1916
1917 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1918
1919 myh = coff_link_hash_lookup
1920 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1921
1922 if (myh != NULL)
1923 {
1924 free (tmp_name);
1925 return; /* we've already seen this guy */
1926 }
1927
1928 /* The only trick here is using globals->arm_glue_size as the value. Even
1929 though the section isn't allocated yet, this is where we will be putting
1930 it. */
1931
1932 bh = NULL;
1933 val = globals->arm_glue_size + 1;
1934 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1935 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1936
1937 free (tmp_name);
1938
1939 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1940
1941 return;
1942 }
1943
1944 #ifndef ARM_WINCE
1945 static void
1946 record_thumb_to_arm_glue (info, h)
1947 struct bfd_link_info * info;
1948 struct coff_link_hash_entry * h;
1949 {
1950 const char * name = h->root.root.string;
1951 register asection * s;
1952 char * tmp_name;
1953 struct coff_link_hash_entry * myh;
1954 struct bfd_link_hash_entry * bh;
1955 struct coff_arm_link_hash_table * globals;
1956 bfd_vma val;
1957 bfd_size_type amt;
1958
1959 globals = coff_arm_hash_table (info);
1960
1961 BFD_ASSERT (globals != NULL);
1962 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1963
1964 s = bfd_get_section_by_name
1965 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1966
1967 BFD_ASSERT (s != NULL);
1968
1969 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1970 tmp_name = (char *) bfd_malloc (amt);
1971
1972 BFD_ASSERT (tmp_name);
1973
1974 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1975
1976 myh = coff_link_hash_lookup
1977 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1978
1979 if (myh != NULL)
1980 {
1981 free (tmp_name);
1982 return; /* we've already seen this guy */
1983 }
1984
1985 bh = NULL;
1986 val = globals->thumb_glue_size + 1;
1987 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1988 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1989
1990 /* If we mark it 'thumb', the disassembler will do a better job. */
1991 myh = (struct coff_link_hash_entry *) bh;
1992 myh->class = C_THUMBEXTFUNC;
1993
1994 free (tmp_name);
1995
1996 /* Allocate another symbol to mark where we switch to arm mode. */
1997
1998 #define CHANGE_TO_ARM "__%s_change_to_arm"
1999 #define BACK_FROM_ARM "__%s_back_from_arm"
2000
2001 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
2002 tmp_name = (char *) bfd_malloc (amt);
2003
2004 BFD_ASSERT (tmp_name);
2005
2006 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
2007
2008 bh = NULL;
2009 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
2010 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
2011 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
2012
2013 free (tmp_name);
2014
2015 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
2016
2017 return;
2018 }
2019 #endif /* not ARM_WINCE */
2020
2021 /* Select a BFD to be used to hold the sections used by the glue code.
2022 This function is called from the linker scripts in ld/emultempl/
2023 {armcoff/pe}.em */
2024
2025 bfd_boolean
2026 bfd_arm_get_bfd_for_interworking (abfd, info)
2027 bfd * abfd;
2028 struct bfd_link_info * info;
2029 {
2030 struct coff_arm_link_hash_table * globals;
2031 flagword flags;
2032 asection * sec;
2033
2034 /* If we are only performing a partial link do not bother
2035 getting a bfd to hold the glue. */
2036 if (info->relocatable)
2037 return TRUE;
2038
2039 globals = coff_arm_hash_table (info);
2040
2041 BFD_ASSERT (globals != NULL);
2042
2043 if (globals->bfd_of_glue_owner != NULL)
2044 return TRUE;
2045
2046 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2047
2048 if (sec == NULL)
2049 {
2050 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2051
2052 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2053
2054 if (sec == NULL
2055 || ! bfd_set_section_flags (abfd, sec, flags)
2056 || ! bfd_set_section_alignment (abfd, sec, 2))
2057 return FALSE;
2058 }
2059
2060 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2061
2062 if (sec == NULL)
2063 {
2064 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2065
2066 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2067
2068 if (sec == NULL
2069 || ! bfd_set_section_flags (abfd, sec, flags)
2070 || ! bfd_set_section_alignment (abfd, sec, 2))
2071 return FALSE;
2072 }
2073
2074 /* Save the bfd for later use. */
2075 globals->bfd_of_glue_owner = abfd;
2076
2077 return TRUE;
2078 }
2079
2080 bfd_boolean
2081 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2082 bfd * abfd;
2083 struct bfd_link_info * info;
2084 int support_old_code;
2085 {
2086 asection * sec;
2087 struct coff_arm_link_hash_table * globals;
2088
2089 /* If we are only performing a partial link do not bother
2090 to construct any glue. */
2091 if (info->relocatable)
2092 return TRUE;
2093
2094 /* Here we have a bfd that is to be included on the link. We have a hook
2095 to do reloc rummaging, before section sizes are nailed down. */
2096
2097 _bfd_coff_get_external_symbols (abfd);
2098
2099 globals = coff_arm_hash_table (info);
2100
2101 BFD_ASSERT (globals != NULL);
2102 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2103
2104 globals->support_old_code = support_old_code;
2105
2106 /* Rummage around all the relocs and map the glue vectors. */
2107 sec = abfd->sections;
2108
2109 if (sec == NULL)
2110 return TRUE;
2111
2112 for (; sec != NULL; sec = sec->next)
2113 {
2114 struct internal_reloc * i;
2115 struct internal_reloc * rel;
2116
2117 if (sec->reloc_count == 0)
2118 continue;
2119
2120 /* Load the relocs. */
2121 /* FIXME: there may be a storage leak here. */
2122
2123 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2124
2125 BFD_ASSERT (i != 0);
2126
2127 for (rel = i; rel < i + sec->reloc_count; ++rel)
2128 {
2129 unsigned short r_type = rel->r_type;
2130 long symndx;
2131 struct coff_link_hash_entry * h;
2132
2133 symndx = rel->r_symndx;
2134
2135 /* If the relocation is not against a symbol it cannot concern us. */
2136 if (symndx == -1)
2137 continue;
2138
2139 /* If the index is outside of the range of our table, something has gone wrong. */
2140 if (symndx >= obj_conv_table_size (abfd))
2141 {
2142 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2143 bfd_archive_filename (abfd), symndx);
2144 continue;
2145 }
2146
2147 h = obj_coff_sym_hashes (abfd)[symndx];
2148
2149 /* If the relocation is against a static symbol it must be within
2150 the current section and so cannot be a cross ARM/Thumb relocation. */
2151 if (h == NULL)
2152 continue;
2153
2154 switch (r_type)
2155 {
2156 case ARM_26:
2157 /* This one is a call from arm code. We need to look up
2158 the target of the call. If it is a thumb target, we
2159 insert glue. */
2160
2161 if (h->class == C_THUMBEXTFUNC)
2162 record_arm_to_thumb_glue (info, h);
2163 break;
2164
2165 #ifndef ARM_WINCE
2166 case ARM_THUMB23:
2167 /* This one is a call from thumb code. We used to look
2168 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2169 up the target of the call. If it is an arm target, we
2170 insert glue. If the symbol does not exist it will be
2171 given a class of C_EXT and so we will generate a stub
2172 for it. This is not really a problem, since the link
2173 is doomed anyway. */
2174
2175 switch (h->class)
2176 {
2177 case C_EXT:
2178 case C_STAT:
2179 case C_LABEL:
2180 record_thumb_to_arm_glue (info, h);
2181 break;
2182 default:
2183 ;
2184 }
2185 break;
2186 #endif
2187
2188 default:
2189 break;
2190 }
2191 }
2192 }
2193
2194 return TRUE;
2195 }
2196
2197 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2198
2199 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2200 #define coff_relocate_section coff_arm_relocate_section
2201 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2202 #define coff_adjust_symndx coff_arm_adjust_symndx
2203 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2204 #define coff_final_link_postscript coff_arm_final_link_postscript
2205 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2206 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2207 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2208 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2209 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2210
2211 /* When doing a relocatable link, we want to convert ARM_26 relocs
2212 into ARM_26D relocs. */
2213
2214 static bfd_boolean
2215 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2216 bfd *obfd ATTRIBUTE_UNUSED;
2217 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2218 bfd *ibfd;
2219 asection *sec;
2220 struct internal_reloc *irel;
2221 bfd_boolean *adjustedp;
2222 {
2223 if (irel->r_type == ARM_26)
2224 {
2225 struct coff_link_hash_entry *h;
2226
2227 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2228 if (h != NULL
2229 && (h->root.type == bfd_link_hash_defined
2230 || h->root.type == bfd_link_hash_defweak)
2231 && h->root.u.def.section->output_section == sec->output_section)
2232 irel->r_type = ARM_26D;
2233 }
2234 *adjustedp = FALSE;
2235 return TRUE;
2236 }
2237
2238 /* Called when merging the private data areas of two BFDs.
2239 This is important as it allows us to detect if we are
2240 attempting to merge binaries compiled for different ARM
2241 targets, eg different CPUs or different APCS's. */
2242
2243 static bfd_boolean
2244 coff_arm_merge_private_bfd_data (ibfd, obfd)
2245 bfd * ibfd;
2246 bfd * obfd;
2247 {
2248 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2249
2250 if (ibfd == obfd)
2251 return TRUE;
2252
2253 /* If the two formats are different we cannot merge anything.
2254 This is not an error, since it is permissable to change the
2255 input and output formats. */
2256 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2257 || obfd->xvec->flavour != bfd_target_coff_flavour)
2258 return TRUE;
2259
2260 /* Determine what should happen if the input ARM architecture
2261 does not match the output ARM architecture. */
2262 if (! bfd_arm_merge_machines (ibfd, obfd))
2263 return FALSE;
2264
2265 /* Verify that the APCS is the same for the two BFDs. */
2266 if (APCS_SET (ibfd))
2267 {
2268 if (APCS_SET (obfd))
2269 {
2270 /* If the src and dest have different APCS flag bits set, fail. */
2271 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2272 {
2273 _bfd_error_handler
2274 /* xgettext: c-format */
2275 (_("ERROR: %s is compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2276 bfd_archive_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2277 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2278 );
2279
2280 bfd_set_error (bfd_error_wrong_format);
2281 return FALSE;
2282 }
2283
2284 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2285 {
2286 const char *msg;
2287
2288 if (APCS_FLOAT_FLAG (ibfd))
2289 /* xgettext: c-format */
2290 msg = _("ERROR: %s passes floats in float registers, whereas %s passes them in integer registers");
2291 else
2292 /* xgettext: c-format */
2293 msg = _("ERROR: %s passes floats in integer registers, whereas %s passes them in float registers");
2294
2295 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2296 bfd_get_filename (obfd));
2297
2298 bfd_set_error (bfd_error_wrong_format);
2299 return FALSE;
2300 }
2301
2302 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2303 {
2304 const char * msg;
2305
2306 if (PIC_FLAG (ibfd))
2307 /* xgettext: c-format */
2308 msg = _("ERROR: %s is compiled as position independent code, whereas target %s is absolute position");
2309 else
2310 /* xgettext: c-format */
2311 msg = _("ERROR: %s is compiled as absolute position code, whereas target %s is position independent");
2312 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2313 bfd_get_filename (obfd));
2314
2315 bfd_set_error (bfd_error_wrong_format);
2316 return FALSE;
2317 }
2318 }
2319 else
2320 {
2321 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2322
2323 /* Set up the arch and fields as well as these are probably wrong. */
2324 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2325 }
2326 }
2327
2328 /* Check the interworking support. */
2329 if (INTERWORK_SET (ibfd))
2330 {
2331 if (INTERWORK_SET (obfd))
2332 {
2333 /* If the src and dest differ in their interworking issue a warning. */
2334 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2335 {
2336 const char * msg;
2337
2338 if (INTERWORK_FLAG (ibfd))
2339 /* xgettext: c-format */
2340 msg = _("Warning: %s supports interworking, whereas %s does not");
2341 else
2342 /* xgettext: c-format */
2343 msg = _("Warning: %s does not support interworking, whereas %s does");
2344
2345 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2346 bfd_get_filename (obfd));
2347 }
2348 }
2349 else
2350 {
2351 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2352 }
2353 }
2354
2355 return TRUE;
2356 }
2357
2358 /* Display the flags field. */
2359
2360 static bfd_boolean
2361 coff_arm_print_private_bfd_data (abfd, ptr)
2362 bfd * abfd;
2363 PTR ptr;
2364 {
2365 FILE * file = (FILE *) ptr;
2366
2367 BFD_ASSERT (abfd != NULL && ptr != NULL);
2368
2369 /* xgettext:c-format */
2370 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2371
2372 if (APCS_SET (abfd))
2373 {
2374 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2375 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2376
2377 if (APCS_FLOAT_FLAG (abfd))
2378 fprintf (file, _(" [floats passed in float registers]"));
2379 else
2380 fprintf (file, _(" [floats passed in integer registers]"));
2381
2382 if (PIC_FLAG (abfd))
2383 fprintf (file, _(" [position independent]"));
2384 else
2385 fprintf (file, _(" [absolute position]"));
2386 }
2387
2388 if (! INTERWORK_SET (abfd))
2389 fprintf (file, _(" [interworking flag not initialised]"));
2390 else if (INTERWORK_FLAG (abfd))
2391 fprintf (file, _(" [interworking supported]"));
2392 else
2393 fprintf (file, _(" [interworking not supported]"));
2394
2395 fputc ('\n', file);
2396
2397 return TRUE;
2398 }
2399
2400 /* Copies the given flags into the coff_tdata.flags field.
2401 Typically these flags come from the f_flags[] field of
2402 the COFF filehdr structure, which contains important,
2403 target specific information.
2404 Note: Although this function is static, it is explicitly
2405 called from both coffcode.h and peicode.h. */
2406
2407 static bfd_boolean
2408 _bfd_coff_arm_set_private_flags (abfd, flags)
2409 bfd * abfd;
2410 flagword flags;
2411 {
2412 flagword flag;
2413
2414 BFD_ASSERT (abfd != NULL);
2415
2416 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2417
2418 /* Make sure that the APCS field has not been initialised to the opposite
2419 value. */
2420 if (APCS_SET (abfd)
2421 && ( (APCS_26_FLAG (abfd) != flag)
2422 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2423 || (PIC_FLAG (abfd) != (flags & F_PIC))
2424 ))
2425 return FALSE;
2426
2427 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2428
2429 SET_APCS_FLAGS (abfd, flag);
2430
2431 flag = (flags & F_INTERWORK);
2432
2433 /* If the BFD has already had its interworking flag set, but it
2434 is different from the value that we have been asked to set,
2435 then assume that that merged code will not support interworking
2436 and set the flag accordingly. */
2437 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2438 {
2439 if (flag)
2440 /* xgettext: c-format */
2441 _bfd_error_handler (_("Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"),
2442 bfd_archive_filename (abfd));
2443 else
2444 /* xgettext: c-format */
2445 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2446 bfd_archive_filename (abfd));
2447 flag = 0;
2448 }
2449
2450 SET_INTERWORK_FLAG (abfd, flag);
2451
2452 return TRUE;
2453 }
2454
2455 /* Copy the important parts of the target specific data
2456 from one instance of a BFD to another. */
2457
2458 static bfd_boolean
2459 coff_arm_copy_private_bfd_data (src, dest)
2460 bfd * src;
2461 bfd * dest;
2462 {
2463 BFD_ASSERT (src != NULL && dest != NULL);
2464
2465 if (src == dest)
2466 return TRUE;
2467
2468 /* If the destination is not in the same format as the source, do not do
2469 the copy. */
2470 if (src->xvec != dest->xvec)
2471 return TRUE;
2472
2473 /* copy the flags field */
2474 if (APCS_SET (src))
2475 {
2476 if (APCS_SET (dest))
2477 {
2478 /* If the src and dest have different APCS flag bits set, fail. */
2479 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2480 return FALSE;
2481
2482 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2483 return FALSE;
2484
2485 if (PIC_FLAG (dest) != PIC_FLAG (src))
2486 return FALSE;
2487 }
2488 else
2489 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2490 | PIC_FLAG (src));
2491 }
2492
2493 if (INTERWORK_SET (src))
2494 {
2495 if (INTERWORK_SET (dest))
2496 {
2497 /* If the src and dest have different interworking flags then turn
2498 off the interworking bit. */
2499 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2500 {
2501 if (INTERWORK_FLAG (dest))
2502 {
2503 /* xgettext:c-format */
2504 _bfd_error_handler (("\
2505 Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"),
2506 bfd_get_filename (dest),
2507 bfd_archive_filename (src));
2508 }
2509
2510 SET_INTERWORK_FLAG (dest, 0);
2511 }
2512 }
2513 else
2514 {
2515 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2516 }
2517 }
2518
2519 return TRUE;
2520 }
2521
2522 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2523 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2524 #define LOCAL_LABEL_PREFIX ""
2525 #ifndef USER_LABEL_PREFIX
2526 #define USER_LABEL_PREFIX "_"
2527 #endif
2528
2529 /* Like _bfd_coff_is_local_label_name, but
2530 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2531 non-local.
2532 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2533 labels of the form Lxxx to be stripped. */
2534 static bfd_boolean
2535 coff_arm_is_local_label_name (abfd, name)
2536 bfd * abfd ATTRIBUTE_UNUSED;
2537 const char * name;
2538 {
2539 #ifdef USER_LABEL_PREFIX
2540 if (USER_LABEL_PREFIX[0] != 0)
2541 {
2542 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2543 return FALSE;
2544 }
2545 #endif
2546
2547 #ifdef LOCAL_LABEL_PREFIX
2548 /* If there is a prefix for local labels then look for this.
2549 If the prefix exists, but it is empty, then ignore the test. */
2550
2551 if (LOCAL_LABEL_PREFIX[0] != 0)
2552 {
2553 size_t len = strlen (LOCAL_LABEL_PREFIX);
2554
2555 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2556 return FALSE;
2557
2558 /* Perform the checks below for the rest of the name. */
2559 name += len;
2560 }
2561 #endif
2562
2563 return name[0] == 'L';
2564 }
2565
2566 /* This piece of machinery exists only to guarantee that the bfd that holds
2567 the glue section is written last.
2568
2569 This does depend on bfd_make_section attaching a new section to the
2570 end of the section list for the bfd.
2571
2572 krk@cygnus.com */
2573
2574 static bfd_boolean
2575 coff_arm_link_output_has_begun (sub, info)
2576 bfd * sub;
2577 struct coff_final_link_info * info;
2578 {
2579 return (sub->output_has_begun
2580 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2581 }
2582
2583 static bfd_boolean
2584 coff_arm_final_link_postscript (abfd, pfinfo)
2585 bfd * abfd ATTRIBUTE_UNUSED;
2586 struct coff_final_link_info * pfinfo;
2587 {
2588 struct coff_arm_link_hash_table * globals;
2589
2590 globals = coff_arm_hash_table (pfinfo->info);
2591
2592 BFD_ASSERT (globals != NULL);
2593
2594 if (globals->bfd_of_glue_owner != NULL)
2595 {
2596 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2597 return FALSE;
2598
2599 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2600 }
2601
2602 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2603 }
2604
2605 #include "coffcode.h"
2606
2607 #ifndef TARGET_LITTLE_SYM
2608 #define TARGET_LITTLE_SYM armcoff_little_vec
2609 #endif
2610 #ifndef TARGET_LITTLE_NAME
2611 #define TARGET_LITTLE_NAME "coff-arm-little"
2612 #endif
2613 #ifndef TARGET_BIG_SYM
2614 #define TARGET_BIG_SYM armcoff_big_vec
2615 #endif
2616 #ifndef TARGET_BIG_NAME
2617 #define TARGET_BIG_NAME "coff-arm-big"
2618 #endif
2619
2620 #ifndef TARGET_UNDERSCORE
2621 #define TARGET_UNDERSCORE 0
2622 #endif
2623
2624 #ifndef EXTRA_S_FLAGS
2625 #ifdef COFF_WITH_PE
2626 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2627 #else
2628 #define EXTRA_S_FLAGS SEC_CODE
2629 #endif
2630 #endif
2631
2632 /* Forward declaration for use initialising alternative_target field. */
2633 extern const bfd_target TARGET_BIG_SYM ;
2634
2635 /* Target vectors. */
2636 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2637 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)
GDB Binutils - Deliverables
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