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* xtensa-modules.c: Remove comment indicating that this is a
[binutils.git] / bfd / coff-arm.c
blobf089a6c824d13a26d72dbf9a0f0ac04149e78103
1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002
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_32 1
256 #define ARM_RVA32 2
257 #define ARM_26 3
258 #define ARM_THUMB12 4
259 #define ARM_26D 5
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 EMPTY_HOWTO (-1),
268 HOWTO (ARM_32,
269 0,
270 2,
271 32,
272 FALSE,
273 0,
274 complain_overflow_bitfield,
275 coff_arm_reloc,
276 "ARM_32",
277 TRUE,
278 0xffffffff,
279 0xffffffff,
280 PCRELOFFSET),
281 HOWTO (ARM_RVA32,
282 0,
283 2,
284 32,
285 FALSE,
286 0,
287 complain_overflow_bitfield,
288 coff_arm_reloc,
289 "ARM_RVA32",
290 TRUE,
291 0xffffffff,
292 0xffffffff,
293 PCRELOFFSET),
294 HOWTO (ARM_26,
295 2,
296 2,
297 24,
298 TRUE,
299 0,
300 complain_overflow_signed,
301 aoutarm_fix_pcrel_26 ,
302 "ARM_26",
303 FALSE,
304 0x00ffffff,
305 0x00ffffff,
306 PCRELOFFSET),
307 HOWTO (ARM_THUMB12,
308 1,
309 1,
310 11,
311 TRUE,
312 0,
313 complain_overflow_signed,
314 coff_thumb_pcrel_12 ,
315 "ARM_THUMB12",
316 FALSE,
317 0x000007ff,
318 0x000007ff,
319 PCRELOFFSET),
320 HOWTO (ARM_26D,
321 2,
322 2,
323 24,
324 FALSE,
325 0,
326 complain_overflow_dont,
327 aoutarm_fix_pcrel_26_done,
328 "ARM_26D",
329 TRUE,
330 0x00ffffff,
331 0x0,
332 FALSE),
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_16",
350 TRUE,
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_32",
363 TRUE,
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 containg the Thumb-to-ARM glue. */
925 bfd_size_type thumb_glue_size;
926
927 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
928 bfd_size_type arm_glue_size;
929
930 /* An arbitary 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 (identifed 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
1206 rel = relocs;
1207 relend = rel + input_section->reloc_count;
1208
1209 for (; rel < relend; rel++)
1210 {
1211 int done = 0;
1212 long symndx;
1213 struct coff_link_hash_entry * h;
1214 struct internal_syment * sym;
1215 bfd_vma addend;
1216 bfd_vma val;
1217 reloc_howto_type * howto;
1218 bfd_reloc_status_type rstat;
1219 bfd_vma h_val;
1220
1221 symndx = rel->r_symndx;
1222
1223 if (symndx == -1)
1224 {
1225 h = NULL;
1226 sym = NULL;
1227 }
1228 else
1229 {
1230 h = obj_coff_sym_hashes (input_bfd)[symndx];
1231 sym = syms + symndx;
1232 }
1233
1234 /* COFF treats common symbols in one of two ways. Either the
1235 size of the symbol is included in the section contents, or it
1236 is not. We assume that the size is not included, and force
1237 the rtype_to_howto function to adjust the addend as needed. */
1238
1239 if (sym != NULL && sym->n_scnum != 0)
1240 addend = - sym->n_value;
1241 else
1242 addend = 0;
1243
1244 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1245 sym, &addend);
1246 if (howto == NULL)
1247 return FALSE;
1248
1249 /* The relocation_section function will skip pcrel_offset relocs
1250 when doing a relocateable link. However, we want to convert
1251 ARM26 to ARM26D relocs if possible. We return a fake howto in
1252 this case without pcrel_offset set, and adjust the addend to
1253 compensate. */
1254 if (rel->r_type == ARM_26
1255 && h != NULL
1256 && info->relocateable
1257 && (h->root.type == bfd_link_hash_defined
1258 || h->root.type == bfd_link_hash_defweak)
1259 && (h->root.u.def.section->output_section
1260 == input_section->output_section))
1261 {
1262 static reloc_howto_type fake_arm26_reloc =
1263 HOWTO (ARM_26,
1264 2,
1265 2,
1266 24,
1267 TRUE,
1268 0,
1269 complain_overflow_signed,
1270 aoutarm_fix_pcrel_26 ,
1271 "ARM_26",
1272 FALSE,
1273 0x00ffffff,
1274 0x00ffffff,
1275 FALSE);
1276
1277 addend -= rel->r_vaddr - input_section->vma;
1278 howto = &fake_arm26_reloc;
1279 }
1280
1281 #ifdef ARM_WINCE
1282 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1283 the next opcode's pc, so is off by one. */
1284 #if 0 /* This appears to have been true for WINCE 2.0, but it is not
1285 true for WINCE 3.0. */
1286 if (howto->pc_relative && !info->relocateable)
1287 addend -= 8;
1288 #endif
1289 #endif
1290
1291 /* If we are doing a relocateable link, then we can just ignore
1292 a PC relative reloc that is pcrel_offset. It will already
1293 have the correct value. If this is not a relocateable link,
1294 then we should ignore the symbol value. */
1295 if (howto->pc_relative && howto->pcrel_offset)
1296 {
1297 if (info->relocateable)
1298 continue;
1299 /* FIXME - it is not clear which targets need this next test
1300 and which do not. It is known that it is needed for the
1301 VxWorks and EPOC-PE targets, but it is also known that it
1302 was supressed for other ARM targets. This ought to be
1303 sorted out one day. */
1304 #ifdef ARM_COFF_BUGFIX
1305 /* We must not ignore the symbol value. If the symbol is
1306 within the same section, the relocation should have already
1307 been fixed, but if it is not, we'll be handed a reloc into
1308 the beginning of the symbol's section, so we must not cancel
1309 out the symbol's value, otherwise we'll be adding it in
1310 twice. */
1311 if (sym != NULL && sym->n_scnum != 0)
1312 addend += sym->n_value;
1313 #endif
1314 }
1315
1316 val = 0;
1317
1318 if (h == NULL)
1319 {
1320 asection *sec;
1321
1322 if (symndx == -1)
1323 {
1324 sec = bfd_abs_section_ptr;
1325 val = 0;
1326 }
1327 else
1328 {
1329 sec = sections[symndx];
1330 val = (sec->output_section->vma
1331 + sec->output_offset
1332 + sym->n_value
1333 - sec->vma);
1334 }
1335 }
1336 else
1337 {
1338 #if 1 /* THUMBEXTENSION */
1339 /* We don't output the stubs if we are generating a
1340 relocatable output file, since we may as well leave the
1341 stub generation to the final linker pass. If we fail to
1342 verify that the name is defined, we'll try to build stubs
1343 for an undefined name... */
1344 if (! info->relocateable
1345 && ( h->root.type == bfd_link_hash_defined
1346 || h->root.type == bfd_link_hash_defweak))
1347 {
1348 asection * h_sec = h->root.u.def.section;
1349 const char * name = h->root.root.string;
1350
1351 /* h locates the symbol referenced in the reloc. */
1352 h_val = (h->root.u.def.value
1353 + h_sec->output_section->vma
1354 + h_sec->output_offset);
1355
1356 if (howto->type == ARM_26)
1357 {
1358 if ( h->class == C_THUMBSTATFUNC
1359 || h->class == C_THUMBEXTFUNC)
1360 {
1361 /* Arm code calling a Thumb function. */
1362 unsigned long int tmp;
1363 bfd_vma my_offset;
1364 asection * s;
1365 long int ret_offset;
1366 struct coff_link_hash_entry * myh;
1367 struct coff_arm_link_hash_table * globals;
1368
1369 myh = find_arm_glue (info, name, input_bfd);
1370 if (myh == NULL)
1371 return FALSE;
1372
1373 globals = coff_arm_hash_table (info);
1374
1375 BFD_ASSERT (globals != NULL);
1376 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1377
1378 my_offset = myh->root.u.def.value;
1379
1380 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1381 ARM2THUMB_GLUE_SECTION_NAME);
1382 BFD_ASSERT (s != NULL);
1383 BFD_ASSERT (s->contents != NULL);
1384 BFD_ASSERT (s->output_section != NULL);
1385
1386 if ((my_offset & 0x01) == 0x01)
1387 {
1388 if (h_sec->owner != NULL
1389 && INTERWORK_SET (h_sec->owner)
1390 && ! INTERWORK_FLAG (h_sec->owner))
1391 {
1392 _bfd_error_handler
1393 /* xgettext:c-format */
1394 (_("%s(%s): warning: interworking not enabled."),
1395 bfd_archive_filename (h_sec->owner), name);
1396 _bfd_error_handler
1397 /* xgettext:c-format */
1398 (_(" first occurrence: %s: arm call to thumb"),
1399 bfd_archive_filename (input_bfd));
1400 }
1401
1402 --my_offset;
1403 myh->root.u.def.value = my_offset;
1404
1405 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1406 s->contents + my_offset);
1407
1408 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1409 s->contents + my_offset + 4);
1410
1411 /* It's a thumb address. Add the low order bit. */
1412 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1413 s->contents + my_offset + 8);
1414
1415 if (info->base_file)
1416 arm_emit_base_file_entry (info, output_bfd, s,
1417 my_offset + 8);
1418
1419 }
1420
1421 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1422
1423 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1424 - input_section->vma);
1425
1426 tmp = tmp & 0xFF000000;
1427
1428 /* Somehow these are both 4 too far, so subtract 8. */
1429 ret_offset =
1430 s->output_offset
1431 + my_offset
1432 + s->output_section->vma
1433 - (input_section->output_offset
1434 + input_section->output_section->vma
1435 + rel->r_vaddr)
1436 - 8;
1437
1438 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1439
1440 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1441 contents + rel->r_vaddr - input_section->vma);
1442 done = 1;
1443 }
1444 }
1445
1446 #ifndef ARM_WINCE
1447 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1448 else if (howto->type == ARM_THUMB23)
1449 {
1450 if ( h->class == C_EXT
1451 || h->class == C_STAT
1452 || h->class == C_LABEL)
1453 {
1454 /* Thumb code calling an ARM function */
1455 asection * s = 0;
1456 bfd_vma my_offset;
1457 unsigned long int tmp;
1458 long int ret_offset;
1459 struct coff_link_hash_entry * myh;
1460 struct coff_arm_link_hash_table * globals;
1461
1462 myh = find_thumb_glue (info, name, input_bfd);
1463 if (myh == NULL)
1464 return FALSE;
1465
1466 globals = coff_arm_hash_table (info);
1467
1468 BFD_ASSERT (globals != NULL);
1469 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1470
1471 my_offset = myh->root.u.def.value;
1472
1473 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1474 THUMB2ARM_GLUE_SECTION_NAME);
1475
1476 BFD_ASSERT (s != NULL);
1477 BFD_ASSERT (s->contents != NULL);
1478 BFD_ASSERT (s->output_section != NULL);
1479
1480 if ((my_offset & 0x01) == 0x01)
1481 {
1482 if (h_sec->owner != NULL
1483 && INTERWORK_SET (h_sec->owner)
1484 && ! INTERWORK_FLAG (h_sec->owner)
1485 && ! globals->support_old_code)
1486 {
1487 _bfd_error_handler
1488 /* xgettext:c-format */
1489 (_("%s(%s): warning: interworking not enabled."),
1490 bfd_archive_filename (h_sec->owner), name);
1491 _bfd_error_handler
1492 /* xgettext:c-format */
1493 (_(" first occurrence: %s: thumb call to arm"),
1494 bfd_archive_filename (input_bfd));
1495 _bfd_error_handler
1496 (_(" consider relinking with --support-old-code enabled"));
1497 }
1498
1499 -- my_offset;
1500 myh->root.u.def.value = my_offset;
1501
1502 if (globals->support_old_code)
1503 {
1504 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1505 s->contents + my_offset);
1506
1507 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1508 s->contents + my_offset + 2);
1509
1510 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1511 s->contents + my_offset + 4);
1512
1513 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1514 s->contents + my_offset + 6);
1515
1516 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1517 s->contents + my_offset + 8);
1518
1519 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1520 s->contents + my_offset + 12);
1521
1522 /* Store the address of the function in the last word of the stub. */
1523 bfd_put_32 (output_bfd, h_val,
1524 s->contents + my_offset + 16);
1525
1526 if (info->base_file)
1527 arm_emit_base_file_entry (info, output_bfd, s,
1528 my_offset + 16);
1529 }
1530 else
1531 {
1532 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1533 s->contents + my_offset);
1534
1535 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1536 s->contents + my_offset + 2);
1537
1538 ret_offset =
1539 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1540 - ((bfd_signed_vma)
1541 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1542 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1543 + s->output_section->vma) /* Address of the start of the current section. */
1544 + 4 /* The branch instruction is 4 bytes into the stub. */
1545 + 8); /* ARM branches work from the pc of the instruction + 8. */
1546
1547 bfd_put_32 (output_bfd,
1548 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1549 s->contents + my_offset + 4);
1550
1551 }
1552 }
1553
1554 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1555
1556 /* Now go back and fix up the original BL insn to point
1557 to here. */
1558 ret_offset =
1559 s->output_offset
1560 + my_offset
1561 - (input_section->output_offset
1562 + rel->r_vaddr)
1563 -4;
1564
1565 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1566 - input_section->vma);
1567
1568 bfd_put_32 (output_bfd,
1569 (bfd_vma) insert_thumb_branch (tmp,
1570 ret_offset),
1571 contents + rel->r_vaddr - input_section->vma);
1572
1573 done = 1;
1574 }
1575 }
1576 #endif
1577 }
1578
1579 /* If the relocation type and destination symbol does not
1580 fall into one of the above categories, then we can just
1581 perform a direct link. */
1582
1583 if (done)
1584 rstat = bfd_reloc_ok;
1585 else
1586 #endif /* THUMBEXTENSION */
1587 if ( h->root.type == bfd_link_hash_defined
1588 || h->root.type == bfd_link_hash_defweak)
1589 {
1590 asection *sec;
1591
1592 sec = h->root.u.def.section;
1593 val = (h->root.u.def.value
1594 + sec->output_section->vma
1595 + sec->output_offset);
1596 }
1597
1598 else if (! info->relocateable)
1599 {
1600 if (! ((*info->callbacks->undefined_symbol)
1601 (info, h->root.root.string, input_bfd, input_section,
1602 rel->r_vaddr - input_section->vma, TRUE)))
1603 return FALSE;
1604 }
1605 }
1606
1607 if (info->base_file)
1608 {
1609 /* Emit a reloc if the backend thinks it needs it. */
1610 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1611 arm_emit_base_file_entry (info, output_bfd, input_section,
1612 rel->r_vaddr);
1613 }
1614
1615 #if 1 /* THUMBEXTENSION */
1616 if (done)
1617 rstat = bfd_reloc_ok;
1618 #ifndef ARM_WINCE
1619 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1620 else if (! info->relocateable
1621 && howto->type == ARM_THUMB23)
1622 {
1623 /* This is pretty much a copy of what the default
1624 _bfd_final_link_relocate and _bfd_relocate_contents
1625 routines do to perform a relocation, with special
1626 processing for the split addressing of the Thumb BL
1627 instruction. Again, it would probably be simpler adding a
1628 ThumbBRANCH23 specific macro expansion into the default
1629 code. */
1630
1631 bfd_vma address = rel->r_vaddr - input_section->vma;
1632
1633 if (address > input_section->_raw_size)
1634 rstat = bfd_reloc_outofrange;
1635 else
1636 {
1637 bfd_vma relocation = val + addend;
1638 int size = bfd_get_reloc_size (howto);
1639 bfd_boolean overflow = FALSE;
1640 bfd_byte *location = contents + address;
1641 bfd_vma x = bfd_get_32 (input_bfd, location);
1642 bfd_vma src_mask = 0x007FFFFE;
1643 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1644 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1645 bfd_vma check;
1646 bfd_signed_vma signed_check;
1647 bfd_vma add;
1648 bfd_signed_vma signed_add;
1649
1650 BFD_ASSERT (size == 4);
1651
1652 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1653 relocation -= (input_section->output_section->vma
1654 + input_section->output_offset);
1655
1656 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1657 relocation -= address;
1658
1659 /* No need to negate the relocation with BRANCH23. */
1660 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1661 /* howto->rightshift == 1 */
1662
1663 /* Drop unwanted bits from the value we are relocating to. */
1664 check = relocation >> howto->rightshift;
1665
1666 /* If this is a signed value, the rightshift just dropped
1667 leading 1 bits (assuming twos complement). */
1668 if ((bfd_signed_vma) relocation >= 0)
1669 signed_check = check;
1670 else
1671 signed_check = (check
1672 | ((bfd_vma) - 1
1673 & ~((bfd_vma) - 1 >> howto->rightshift)));
1674
1675 /* Get the value from the object file. */
1676 if (bfd_big_endian (input_bfd))
1677 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1678 else
1679 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1680
1681 /* Get the value from the object file with an appropriate sign.
1682 The expression involving howto->src_mask isolates the upper
1683 bit of src_mask. If that bit is set in the value we are
1684 adding, it is negative, and we subtract out that number times
1685 two. If src_mask includes the highest possible bit, then we
1686 can not get the upper bit, but that does not matter since
1687 signed_add needs no adjustment to become negative in that
1688 case. */
1689 signed_add = add;
1690
1691 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1692 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1693
1694 /* howto->bitpos == 0 */
1695 /* Add the value from the object file, shifted so that it is a
1696 straight number. */
1697 signed_check += signed_add;
1698 relocation += signed_add;
1699
1700 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1701
1702 /* Assumes two's complement. */
1703 if ( signed_check > reloc_signed_max
1704 || signed_check < reloc_signed_min)
1705 overflow = TRUE;
1706
1707 /* Put the relocation into the correct bits.
1708 For a BLX instruction, make sure that the relocation is rounded up
1709 to a word boundary. This follows the semantics of the instruction
1710 which specifies that bit 1 of the target address will come from bit
1711 1 of the base address. */
1712 if (bfd_big_endian (input_bfd))
1713 {
1714 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1715 relocation += 2;
1716 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1717 }
1718 else
1719 {
1720 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1721 relocation += 2;
1722 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1723 }
1724
1725 /* Add the relocation to the correct bits of X. */
1726 x = ((x & ~howto->dst_mask) | relocation);
1727
1728 /* Put the relocated value back in the object file. */
1729 bfd_put_32 (input_bfd, x, location);
1730
1731 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1732 }
1733 }
1734 #endif
1735 else
1736 #endif /* THUMBEXTENSION */
1737 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1738 contents,
1739 rel->r_vaddr - input_section->vma,
1740 val, addend);
1741 #if 1 /* THUMBEXTENSION */
1742 /* FIXME:
1743 Is this the best way to fix up thumb addresses? krk@cygnus.com
1744 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1745 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1746 if (! info->relocateable
1747 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1748 {
1749 /* Determine if we need to set the bottom bit of a relocated address
1750 because the address is the address of a Thumb code symbol. */
1751
1752 int patchit = FALSE;
1753
1754 if (h != NULL
1755 && ( h->class == C_THUMBSTATFUNC
1756 || h->class == C_THUMBEXTFUNC))
1757 {
1758 patchit = TRUE;
1759 }
1760 else if (sym != NULL
1761 && sym->n_scnum > N_UNDEF)
1762 {
1763 /* No hash entry - use the symbol instead. */
1764
1765 if ( sym->n_sclass == C_THUMBSTATFUNC
1766 || sym->n_sclass == C_THUMBEXTFUNC)
1767 patchit = TRUE;
1768 }
1769
1770 if (patchit)
1771 {
1772 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1773 bfd_vma x = bfd_get_32 (input_bfd, location);
1774
1775 bfd_put_32 (input_bfd, x | 1, location);
1776 }
1777 }
1778 #endif /* THUMBEXTENSION */
1779
1780 switch (rstat)
1781 {
1782 default:
1783 abort ();
1784 case bfd_reloc_ok:
1785 break;
1786 case bfd_reloc_outofrange:
1787 (*_bfd_error_handler)
1788 (_("%s: bad reloc address 0x%lx in section `%s'"),
1789 bfd_archive_filename (input_bfd),
1790 (unsigned long) rel->r_vaddr,
1791 bfd_get_section_name (input_bfd, input_section));
1792 return FALSE;
1793 case bfd_reloc_overflow:
1794 {
1795 const char *name;
1796 char buf[SYMNMLEN + 1];
1797
1798 if (symndx == -1)
1799 name = "*ABS*";
1800 else if (h != NULL)
1801 name = h->root.root.string;
1802 else
1803 {
1804 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1805 if (name == NULL)
1806 return FALSE;
1807 }
1808
1809 if (! ((*info->callbacks->reloc_overflow)
1810 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1811 input_section, rel->r_vaddr - input_section->vma)))
1812 return FALSE;
1813 }
1814 }
1815 }
1816
1817 return TRUE;
1818 }
1819
1820 #ifndef COFF_IMAGE_WITH_PE
1821
1822 bfd_boolean
1823 bfd_arm_allocate_interworking_sections (info)
1824 struct bfd_link_info * info;
1825 {
1826 asection * s;
1827 bfd_byte * foo;
1828 struct coff_arm_link_hash_table * globals;
1829 #if 0
1830 static char test_char = '1';
1831 #endif
1832
1833 globals = coff_arm_hash_table (info);
1834
1835 BFD_ASSERT (globals != NULL);
1836
1837 if (globals->arm_glue_size != 0)
1838 {
1839 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1840
1841 s = bfd_get_section_by_name
1842 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1843
1844 BFD_ASSERT (s != NULL);
1845
1846 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1847 globals->arm_glue_size);
1848 #if 0
1849 memset (foo, test_char, (size_t) globals->arm_glue_size);
1850 #endif
1851
1852 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1853 s->contents = foo;
1854 }
1855
1856 if (globals->thumb_glue_size != 0)
1857 {
1858 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1859
1860 s = bfd_get_section_by_name
1861 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1862
1863 BFD_ASSERT (s != NULL);
1864
1865 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1866 globals->thumb_glue_size);
1867 #if 0
1868 memset (foo, test_char, (size_t) globals->thumb_glue_size);
1869 #endif
1870
1871 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1872 s->contents = foo;
1873 }
1874
1875 return TRUE;
1876 }
1877
1878 static void
1879 record_arm_to_thumb_glue (info, h)
1880 struct bfd_link_info * info;
1881 struct coff_link_hash_entry * h;
1882 {
1883 const char * name = h->root.root.string;
1884 register asection * s;
1885 char * tmp_name;
1886 struct coff_link_hash_entry * myh;
1887 struct bfd_link_hash_entry * bh;
1888 struct coff_arm_link_hash_table * globals;
1889 bfd_vma val;
1890 bfd_size_type amt;
1891
1892 globals = coff_arm_hash_table (info);
1893
1894 BFD_ASSERT (globals != NULL);
1895 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1896
1897 s = bfd_get_section_by_name
1898 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1899
1900 BFD_ASSERT (s != NULL);
1901
1902 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1903 tmp_name = (char *) bfd_malloc (amt);
1904
1905 BFD_ASSERT (tmp_name);
1906
1907 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1908
1909 myh = coff_link_hash_lookup
1910 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1911
1912 if (myh != NULL)
1913 {
1914 free (tmp_name);
1915 return; /* we've already seen this guy */
1916 }
1917
1918 /* The only trick here is using globals->arm_glue_size as the value. Even
1919 though the section isn't allocated yet, this is where we will be putting
1920 it. */
1921
1922 bh = NULL;
1923 val = globals->arm_glue_size + 1;
1924 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1925 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1926
1927 free (tmp_name);
1928
1929 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1930
1931 return;
1932 }
1933
1934 #ifndef ARM_WINCE
1935 static void
1936 record_thumb_to_arm_glue (info, h)
1937 struct bfd_link_info * info;
1938 struct coff_link_hash_entry * h;
1939 {
1940 const char * name = h->root.root.string;
1941 register asection * s;
1942 char * tmp_name;
1943 struct coff_link_hash_entry * myh;
1944 struct bfd_link_hash_entry * bh;
1945 struct coff_arm_link_hash_table * globals;
1946 bfd_vma val;
1947 bfd_size_type amt;
1948
1949 globals = coff_arm_hash_table (info);
1950
1951 BFD_ASSERT (globals != NULL);
1952 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1953
1954 s = bfd_get_section_by_name
1955 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1956
1957 BFD_ASSERT (s != NULL);
1958
1959 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1960 tmp_name = (char *) bfd_malloc (amt);
1961
1962 BFD_ASSERT (tmp_name);
1963
1964 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1965
1966 myh = coff_link_hash_lookup
1967 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1968
1969 if (myh != NULL)
1970 {
1971 free (tmp_name);
1972 return; /* we've already seen this guy */
1973 }
1974
1975 bh = NULL;
1976 val = globals->thumb_glue_size + 1;
1977 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1978 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1979
1980 /* If we mark it 'thumb', the disassembler will do a better job. */
1981 myh = (struct coff_link_hash_entry *) bh;
1982 myh->class = C_THUMBEXTFUNC;
1983
1984 free (tmp_name);
1985
1986 /* Allocate another symbol to mark where we switch to arm mode. */
1987
1988 #define CHANGE_TO_ARM "__%s_change_to_arm"
1989 #define BACK_FROM_ARM "__%s_back_from_arm"
1990
1991 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1992 tmp_name = (char *) bfd_malloc (amt);
1993
1994 BFD_ASSERT (tmp_name);
1995
1996 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1997
1998 bh = NULL;
1999 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
2000 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
2001 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
2002
2003 free (tmp_name);
2004
2005 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
2006
2007 return;
2008 }
2009 #endif /* not ARM_WINCE */
2010
2011 /* Select a BFD to be used to hold the sections used by the glue code.
2012 This function is called from the linker scripts in ld/emultempl/
2013 {armcoff/pe}.em */
2014
2015 bfd_boolean
2016 bfd_arm_get_bfd_for_interworking (abfd, info)
2017 bfd * abfd;
2018 struct bfd_link_info * info;
2019 {
2020 struct coff_arm_link_hash_table * globals;
2021 flagword flags;
2022 asection * sec;
2023
2024 /* If we are only performing a partial link do not bother
2025 getting a bfd to hold the glue. */
2026 if (info->relocateable)
2027 return TRUE;
2028
2029 globals = coff_arm_hash_table (info);
2030
2031 BFD_ASSERT (globals != NULL);
2032
2033 if (globals->bfd_of_glue_owner != NULL)
2034 return TRUE;
2035
2036 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2037
2038 if (sec == NULL)
2039 {
2040 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2041
2042 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2043
2044 if (sec == NULL
2045 || ! bfd_set_section_flags (abfd, sec, flags)
2046 || ! bfd_set_section_alignment (abfd, sec, 2))
2047 return FALSE;
2048 }
2049
2050 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2051
2052 if (sec == NULL)
2053 {
2054 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2055
2056 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2057
2058 if (sec == NULL
2059 || ! bfd_set_section_flags (abfd, sec, flags)
2060 || ! bfd_set_section_alignment (abfd, sec, 2))
2061 return FALSE;
2062 }
2063
2064 /* Save the bfd for later use. */
2065 globals->bfd_of_glue_owner = abfd;
2066
2067 return TRUE;
2068 }
2069
2070 bfd_boolean
2071 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2072 bfd * abfd;
2073 struct bfd_link_info * info;
2074 int support_old_code;
2075 {
2076 asection * sec;
2077 struct coff_arm_link_hash_table * globals;
2078
2079 /* If we are only performing a partial link do not bother
2080 to construct any glue. */
2081 if (info->relocateable)
2082 return TRUE;
2083
2084 /* Here we have a bfd that is to be included on the link. We have a hook
2085 to do reloc rummaging, before section sizes are nailed down. */
2086
2087 _bfd_coff_get_external_symbols (abfd);
2088
2089 globals = coff_arm_hash_table (info);
2090
2091 BFD_ASSERT (globals != NULL);
2092 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2093
2094 globals->support_old_code = support_old_code;
2095
2096 /* Rummage around all the relocs and map the glue vectors. */
2097 sec = abfd->sections;
2098
2099 if (sec == NULL)
2100 return TRUE;
2101
2102 for (; sec != NULL; sec = sec->next)
2103 {
2104 struct internal_reloc * i;
2105 struct internal_reloc * rel;
2106
2107 if (sec->reloc_count == 0)
2108 continue;
2109
2110 /* Load the relocs. */
2111 /* FIXME: there may be a storage leak here. */
2112
2113 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2114
2115 BFD_ASSERT (i != 0);
2116
2117 for (rel = i; rel < i + sec->reloc_count; ++rel)
2118 {
2119 unsigned short r_type = rel->r_type;
2120 long symndx;
2121 struct coff_link_hash_entry * h;
2122
2123 symndx = rel->r_symndx;
2124
2125 /* If the relocation is not against a symbol it cannot concern us. */
2126 if (symndx == -1)
2127 continue;
2128
2129 /* If the index is outside of the range of our table, something has gone wrong. */
2130 if (symndx >= obj_conv_table_size (abfd))
2131 {
2132 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2133 bfd_archive_filename (abfd), symndx);
2134 continue;
2135 }
2136
2137 h = obj_coff_sym_hashes (abfd)[symndx];
2138
2139 /* If the relocation is against a static symbol it must be within
2140 the current section and so cannot be a cross ARM/Thumb relocation. */
2141 if (h == NULL)
2142 continue;
2143
2144 switch (r_type)
2145 {
2146 case ARM_26:
2147 /* This one is a call from arm code. We need to look up
2148 the target of the call. If it is a thumb target, we
2149 insert glue. */
2150
2151 if (h->class == C_THUMBEXTFUNC)
2152 record_arm_to_thumb_glue (info, h);
2153 break;
2154
2155 #ifndef ARM_WINCE
2156 case ARM_THUMB23:
2157 /* This one is a call from thumb code. We used to look
2158 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2159 up the target of the call. If it is an arm target, we
2160 insert glue. If the symbol does not exist it will be
2161 given a class of C_EXT and so we will generate a stub
2162 for it. This is not really a problem, since the link
2163 is doomed anyway. */
2164
2165 switch (h->class)
2166 {
2167 case C_EXT:
2168 case C_STAT:
2169 case C_LABEL:
2170 record_thumb_to_arm_glue (info, h);
2171 break;
2172 default:
2173 ;
2174 }
2175 break;
2176 #endif
2177
2178 default:
2179 break;
2180 }
2181 }
2182 }
2183
2184 return TRUE;
2185 }
2186
2187 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2188
2189 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2190 #define coff_relocate_section coff_arm_relocate_section
2191 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2192 #define coff_adjust_symndx coff_arm_adjust_symndx
2193 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2194 #define coff_final_link_postscript coff_arm_final_link_postscript
2195 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2196 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2197 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2198 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2199 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2200
2201 /* When doing a relocateable link, we want to convert ARM26 relocs
2202 into ARM26D relocs. */
2203
2204 static bfd_boolean
2205 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2206 bfd *obfd ATTRIBUTE_UNUSED;
2207 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2208 bfd *ibfd;
2209 asection *sec;
2210 struct internal_reloc *irel;
2211 bfd_boolean *adjustedp;
2212 {
2213 if (irel->r_type == 3)
2214 {
2215 struct coff_link_hash_entry *h;
2216
2217 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2218 if (h != NULL
2219 && (h->root.type == bfd_link_hash_defined
2220 || h->root.type == bfd_link_hash_defweak)
2221 && h->root.u.def.section->output_section == sec->output_section)
2222 irel->r_type = 7;
2223 }
2224 *adjustedp = FALSE;
2225 return TRUE;
2226 }
2227
2228 /* Called when merging the private data areas of two BFDs.
2229 This is important as it allows us to detect if we are
2230 attempting to merge binaries compiled for different ARM
2231 targets, eg different CPUs or differents APCS's. */
2232
2233 static bfd_boolean
2234 coff_arm_merge_private_bfd_data (ibfd, obfd)
2235 bfd * ibfd;
2236 bfd * obfd;
2237 {
2238 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2239
2240 if (ibfd == obfd)
2241 return TRUE;
2242
2243 /* If the two formats are different we cannot merge anything.
2244 This is not an error, since it is permissable to change the
2245 input and output formats. */
2246 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2247 || obfd->xvec->flavour != bfd_target_coff_flavour)
2248 return TRUE;
2249
2250 /* Determine what should happen if the input ARM architecture
2251 does not match the output ARM architecture. */
2252 if (! bfd_arm_merge_machines (ibfd, obfd))
2253 return FALSE;
2254
2255 /* Verify that the APCS is the same for the two BFDs. */
2256 if (APCS_SET (ibfd))
2257 {
2258 if (APCS_SET (obfd))
2259 {
2260 /* If the src and dest have different APCS flag bits set, fail. */
2261 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2262 {
2263 _bfd_error_handler
2264 /* xgettext: c-format */
2265 (_("ERROR: %s is compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2266 bfd_archive_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2267 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2268 );
2269
2270 bfd_set_error (bfd_error_wrong_format);
2271 return FALSE;
2272 }
2273
2274 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2275 {
2276 const char *msg;
2277
2278 if (APCS_FLOAT_FLAG (ibfd))
2279 /* xgettext: c-format */
2280 msg = _("ERROR: %s passes floats in float registers, whereas %s passes them in integer registers");
2281 else
2282 /* xgettext: c-format */
2283 msg = _("ERROR: %s passes floats in integer registers, whereas %s passes them in float registers");
2284
2285 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2286 bfd_get_filename (obfd));
2287
2288 bfd_set_error (bfd_error_wrong_format);
2289 return FALSE;
2290 }
2291
2292 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2293 {
2294 const char * msg;
2295
2296 if (PIC_FLAG (ibfd))
2297 /* xgettext: c-format */
2298 msg = _("ERROR: %s is compiled as position independent code, whereas target %s is absolute position");
2299 else
2300 /* xgettext: c-format */
2301 msg = _("ERROR: %s is compiled as absolute position code, whereas target %s is position independent");
2302 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2303 bfd_get_filename (obfd));
2304
2305 bfd_set_error (bfd_error_wrong_format);
2306 return FALSE;
2307 }
2308 }
2309 else
2310 {
2311 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2312
2313 /* Set up the arch and fields as well as these are probably wrong. */
2314 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2315 }
2316 }
2317
2318 /* Check the interworking support. */
2319 if (INTERWORK_SET (ibfd))
2320 {
2321 if (INTERWORK_SET (obfd))
2322 {
2323 /* If the src and dest differ in their interworking issue a warning. */
2324 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2325 {
2326 const char * msg;
2327
2328 if (INTERWORK_FLAG (ibfd))
2329 /* xgettext: c-format */
2330 msg = _("Warning: %s supports interworking, whereas %s does not");
2331 else
2332 /* xgettext: c-format */
2333 msg = _("Warning: %s does not support interworking, whereas %s does");
2334
2335 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2336 bfd_get_filename (obfd));
2337 }
2338 }
2339 else
2340 {
2341 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2342 }
2343 }
2344
2345 return TRUE;
2346 }
2347
2348 /* Display the flags field. */
2349
2350 static bfd_boolean
2351 coff_arm_print_private_bfd_data (abfd, ptr)
2352 bfd * abfd;
2353 PTR ptr;
2354 {
2355 FILE * file = (FILE *) ptr;
2356
2357 BFD_ASSERT (abfd != NULL && ptr != NULL);
2358
2359 /* xgettext:c-format */
2360 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2361
2362 if (APCS_SET (abfd))
2363 {
2364 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2365 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2366
2367 if (APCS_FLOAT_FLAG (abfd))
2368 fprintf (file, _(" [floats passed in float registers]"));
2369 else
2370 fprintf (file, _(" [floats passed in integer registers]"));
2371
2372 if (PIC_FLAG (abfd))
2373 fprintf (file, _(" [position independent]"));
2374 else
2375 fprintf (file, _(" [absolute position]"));
2376 }
2377
2378 if (! INTERWORK_SET (abfd))
2379 fprintf (file, _(" [interworking flag not initialised]"));
2380 else if (INTERWORK_FLAG (abfd))
2381 fprintf (file, _(" [interworking supported]"));
2382 else
2383 fprintf (file, _(" [interworking not supported]"));
2384
2385 fputc ('\n', file);
2386
2387 return TRUE;
2388 }
2389
2390 /* Copies the given flags into the coff_tdata.flags field.
2391 Typically these flags come from the f_flags[] field of
2392 the COFF filehdr structure, which contains important,
2393 target specific information.
2394 Note: Although this function is static, it is explicitly
2395 called from both coffcode.h and peicode.h. */
2396
2397 static bfd_boolean
2398 _bfd_coff_arm_set_private_flags (abfd, flags)
2399 bfd * abfd;
2400 flagword flags;
2401 {
2402 flagword flag;
2403
2404 BFD_ASSERT (abfd != NULL);
2405
2406 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2407
2408 /* Make sure that the APCS field has not been initialised to the opposite
2409 value. */
2410 if (APCS_SET (abfd)
2411 && ( (APCS_26_FLAG (abfd) != flag)
2412 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2413 || (PIC_FLAG (abfd) != (flags & F_PIC))
2414 ))
2415 return FALSE;
2416
2417 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2418
2419 SET_APCS_FLAGS (abfd, flag);
2420
2421 flag = (flags & F_INTERWORK);
2422
2423 /* If the BFD has already had its interworking flag set, but it
2424 is different from the value that we have been asked to set,
2425 then assume that that merged code will not support interworking
2426 and set the flag accordingly. */
2427 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2428 {
2429 if (flag)
2430 /* xgettext: c-format */
2431 _bfd_error_handler (_("Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"),
2432 bfd_archive_filename (abfd));
2433 else
2434 /* xgettext: c-format */
2435 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2436 bfd_archive_filename (abfd));
2437 flag = 0;
2438 }
2439
2440 SET_INTERWORK_FLAG (abfd, flag);
2441
2442 return TRUE;
2443 }
2444
2445 /* Copy the important parts of the target specific data
2446 from one instance of a BFD to another. */
2447
2448 static bfd_boolean
2449 coff_arm_copy_private_bfd_data (src, dest)
2450 bfd * src;
2451 bfd * dest;
2452 {
2453 BFD_ASSERT (src != NULL && dest != NULL);
2454
2455 if (src == dest)
2456 return TRUE;
2457
2458 /* If the destination is not in the same format as the source, do not do
2459 the copy. */
2460 if (src->xvec != dest->xvec)
2461 return TRUE;
2462
2463 /* copy the flags field */
2464 if (APCS_SET (src))
2465 {
2466 if (APCS_SET (dest))
2467 {
2468 /* If the src and dest have different APCS flag bits set, fail. */
2469 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2470 return FALSE;
2471
2472 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2473 return FALSE;
2474
2475 if (PIC_FLAG (dest) != PIC_FLAG (src))
2476 return FALSE;
2477 }
2478 else
2479 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2480 | PIC_FLAG (src));
2481 }
2482
2483 if (INTERWORK_SET (src))
2484 {
2485 if (INTERWORK_SET (dest))
2486 {
2487 /* If the src and dest have different interworking flags then turn
2488 off the interworking bit. */
2489 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2490 {
2491 if (INTERWORK_FLAG (dest))
2492 {
2493 /* xgettext:c-format */
2494 _bfd_error_handler (("\
2495 Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"),
2496 bfd_get_filename (dest),
2497 bfd_archive_filename (src));
2498 }
2499
2500 SET_INTERWORK_FLAG (dest, 0);
2501 }
2502 }
2503 else
2504 {
2505 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2506 }
2507 }
2508
2509 return TRUE;
2510 }
2511
2512 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2513 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2514 #define LOCAL_LABEL_PREFIX ""
2515 #ifndef USER_LABEL_PREFIX
2516 #define USER_LABEL_PREFIX "_"
2517 #endif
2518
2519 /* Like _bfd_coff_is_local_label_name, but
2520 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2521 non-local.
2522 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2523 labels of the form Lxxx to be stripped. */
2524 static bfd_boolean
2525 coff_arm_is_local_label_name (abfd, name)
2526 bfd * abfd ATTRIBUTE_UNUSED;
2527 const char * name;
2528 {
2529 #ifdef USER_LABEL_PREFIX
2530 if (USER_LABEL_PREFIX[0] != 0)
2531 {
2532 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2533 return FALSE;
2534 }
2535 #endif
2536
2537 #ifdef LOCAL_LABEL_PREFIX
2538 /* If there is a prefix for local labels then look for this.
2539 If the prefix exists, but it is empty, then ignore the test. */
2540
2541 if (LOCAL_LABEL_PREFIX[0] != 0)
2542 {
2543 size_t len = strlen (LOCAL_LABEL_PREFIX);
2544
2545 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2546 return FALSE;
2547
2548 /* Perform the checks below for the rest of the name. */
2549 name += len;
2550 }
2551 #endif
2552
2553 return name[0] == 'L';
2554 }
2555
2556 /* This piece of machinery exists only to guarantee that the bfd that holds
2557 the glue section is written last.
2558
2559 This does depend on bfd_make_section attaching a new section to the
2560 end of the section list for the bfd.
2561
2562 krk@cygnus.com */
2563
2564 static bfd_boolean
2565 coff_arm_link_output_has_begun (sub, info)
2566 bfd * sub;
2567 struct coff_final_link_info * info;
2568 {
2569 return (sub->output_has_begun
2570 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2571 }
2572
2573 static bfd_boolean
2574 coff_arm_final_link_postscript (abfd, pfinfo)
2575 bfd * abfd ATTRIBUTE_UNUSED;
2576 struct coff_final_link_info * pfinfo;
2577 {
2578 struct coff_arm_link_hash_table * globals;
2579
2580 globals = coff_arm_hash_table (pfinfo->info);
2581
2582 BFD_ASSERT (globals != NULL);
2583
2584 if (globals->bfd_of_glue_owner != NULL)
2585 {
2586 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2587 return FALSE;
2588
2589 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2590 }
2591
2592 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2593 }
2594
2595 #include "coffcode.h"
2596
2597 #ifndef TARGET_LITTLE_SYM
2598 #define TARGET_LITTLE_SYM armcoff_little_vec
2599 #endif
2600 #ifndef TARGET_LITTLE_NAME
2601 #define TARGET_LITTLE_NAME "coff-arm-little"
2602 #endif
2603 #ifndef TARGET_BIG_SYM
2604 #define TARGET_BIG_SYM armcoff_big_vec
2605 #endif
2606 #ifndef TARGET_BIG_NAME
2607 #define TARGET_BIG_NAME "coff-arm-big"
2608 #endif
2609
2610 #ifndef TARGET_UNDERSCORE
2611 #define TARGET_UNDERSCORE 0
2612 #endif
2613
2614 #ifndef EXTRA_S_FLAGS
2615 #ifdef COFF_WITH_PE
2616 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2617 #else
2618 #define EXTRA_S_FLAGS 0
2619 #endif
2620 #endif
2621
2622 /* Forward declaration for use initialising alternative_target field. */
2623 extern const bfd_target TARGET_BIG_SYM ;
2624
2625 /* Target vectors. */
2626 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2627 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)
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