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[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 (_("%B: unable to find THUMB glue '%s' for `%s'"),
1067 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 (_("%B: unable to find ARM glue '%s' for `%s'"),
1097 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 _bfd_error_handler
1399 /* xgettext:c-format */
1400 (_("%B(%s): warning: interworking not enabled.\n"
1401 " first occurrence: %B: arm call to thumb"),
1402 h_sec->owner, input_bfd, name);
1403
1404 --my_offset;
1405 myh->root.u.def.value = my_offset;
1406
1407 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1408 s->contents + my_offset);
1409
1410 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1411 s->contents + my_offset + 4);
1412
1413 /* It's a thumb address. Add the low order bit. */
1414 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1415 s->contents + my_offset + 8);
1416
1417 if (info->base_file)
1418 arm_emit_base_file_entry (info, output_bfd, s,
1419 my_offset + 8);
1420
1421 }
1422
1423 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1424
1425 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1426 - input_section->vma);
1427
1428 tmp = tmp & 0xFF000000;
1429
1430 /* Somehow these are both 4 too far, so subtract 8. */
1431 ret_offset =
1432 s->output_offset
1433 + my_offset
1434 + s->output_section->vma
1435 - (input_section->output_offset
1436 + input_section->output_section->vma
1437 + rel->r_vaddr)
1438 - 8;
1439
1440 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1441
1442 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1443 contents + rel->r_vaddr - input_section->vma);
1444 done = 1;
1445 }
1446 }
1447
1448 #ifndef ARM_WINCE
1449 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1450 else if (howto->type == ARM_THUMB23)
1451 {
1452 if ( h->class == C_EXT
1453 || h->class == C_STAT
1454 || h->class == C_LABEL)
1455 {
1456 /* Thumb code calling an ARM function */
1457 asection * s = 0;
1458 bfd_vma my_offset;
1459 unsigned long int tmp;
1460 long int ret_offset;
1461 struct coff_link_hash_entry * myh;
1462 struct coff_arm_link_hash_table * globals;
1463
1464 myh = find_thumb_glue (info, name, input_bfd);
1465 if (myh == NULL)
1466 return FALSE;
1467
1468 globals = coff_arm_hash_table (info);
1469
1470 BFD_ASSERT (globals != NULL);
1471 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1472
1473 my_offset = myh->root.u.def.value;
1474
1475 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1476 THUMB2ARM_GLUE_SECTION_NAME);
1477
1478 BFD_ASSERT (s != NULL);
1479 BFD_ASSERT (s->contents != NULL);
1480 BFD_ASSERT (s->output_section != NULL);
1481
1482 if ((my_offset & 0x01) == 0x01)
1483 {
1484 if (h_sec->owner != NULL
1485 && INTERWORK_SET (h_sec->owner)
1486 && ! INTERWORK_FLAG (h_sec->owner)
1487 && ! globals->support_old_code)
1488 _bfd_error_handler
1489 /* xgettext:c-format */
1490 (_("%B(%s): warning: interworking not enabled.\n"
1491 " first occurrence: %B: thumb call to arm\n"
1492 " consider relinking with --support-old-code enabled"),
1493 h_sec->owner, input_bfd, name);
1494
1495 -- my_offset;
1496 myh->root.u.def.value = my_offset;
1497
1498 if (globals->support_old_code)
1499 {
1500 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1501 s->contents + my_offset);
1502
1503 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1504 s->contents + my_offset + 2);
1505
1506 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1507 s->contents + my_offset + 4);
1508
1509 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1510 s->contents + my_offset + 6);
1511
1512 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1513 s->contents + my_offset + 8);
1514
1515 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1516 s->contents + my_offset + 12);
1517
1518 /* Store the address of the function in the last word of the stub. */
1519 bfd_put_32 (output_bfd, h_val,
1520 s->contents + my_offset + 16);
1521
1522 if (info->base_file)
1523 arm_emit_base_file_entry (info, output_bfd, s,
1524 my_offset + 16);
1525 }
1526 else
1527 {
1528 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1529 s->contents + my_offset);
1530
1531 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1532 s->contents + my_offset + 2);
1533
1534 ret_offset =
1535 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1536 - ((bfd_signed_vma)
1537 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1538 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1539 + s->output_section->vma) /* Address of the start of the current section. */
1540 + 4 /* The branch instruction is 4 bytes into the stub. */
1541 + 8); /* ARM branches work from the pc of the instruction + 8. */
1542
1543 bfd_put_32 (output_bfd,
1544 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1545 s->contents + my_offset + 4);
1546
1547 }
1548 }
1549
1550 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1551
1552 /* Now go back and fix up the original BL insn to point
1553 to here. */
1554 ret_offset =
1555 s->output_offset
1556 + my_offset
1557 - (input_section->output_offset
1558 + rel->r_vaddr)
1559 -4;
1560
1561 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1562 - input_section->vma);
1563
1564 bfd_put_32 (output_bfd,
1565 (bfd_vma) insert_thumb_branch (tmp,
1566 ret_offset),
1567 contents + rel->r_vaddr - input_section->vma);
1568
1569 done = 1;
1570 }
1571 }
1572 #endif
1573 }
1574
1575 /* If the relocation type and destination symbol does not
1576 fall into one of the above categories, then we can just
1577 perform a direct link. */
1578
1579 if (done)
1580 rstat = bfd_reloc_ok;
1581 else
1582 #endif /* THUMBEXTENSION */
1583 if ( h->root.type == bfd_link_hash_defined
1584 || h->root.type == bfd_link_hash_defweak)
1585 {
1586 asection *sec;
1587
1588 sec = h->root.u.def.section;
1589 val = (h->root.u.def.value
1590 + sec->output_section->vma
1591 + sec->output_offset);
1592 }
1593
1594 else if (! info->relocatable)
1595 {
1596 if (! ((*info->callbacks->undefined_symbol)
1597 (info, h->root.root.string, input_bfd, input_section,
1598 rel->r_vaddr - input_section->vma, TRUE)))
1599 return FALSE;
1600 }
1601 }
1602
1603 if (info->base_file)
1604 {
1605 /* Emit a reloc if the backend thinks it needs it. */
1606 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1607 arm_emit_base_file_entry (info, output_bfd, input_section,
1608 rel->r_vaddr);
1609 }
1610
1611 #if 1 /* THUMBEXTENSION */
1612 if (done)
1613 rstat = bfd_reloc_ok;
1614 #ifndef ARM_WINCE
1615 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1616 else if (! info->relocatable
1617 && howto->type == ARM_THUMB23)
1618 {
1619 /* This is pretty much a copy of what the default
1620 _bfd_final_link_relocate and _bfd_relocate_contents
1621 routines do to perform a relocation, with special
1622 processing for the split addressing of the Thumb BL
1623 instruction. Again, it would probably be simpler adding a
1624 ThumbBRANCH23 specific macro expansion into the default
1625 code. */
1626
1627 bfd_vma address = rel->r_vaddr - input_section->vma;
1628
1629 if (address > high_address)
1630 rstat = bfd_reloc_outofrange;
1631 else
1632 {
1633 bfd_vma relocation = val + addend;
1634 int size = bfd_get_reloc_size (howto);
1635 bfd_boolean overflow = FALSE;
1636 bfd_byte *location = contents + address;
1637 bfd_vma x = bfd_get_32 (input_bfd, location);
1638 bfd_vma src_mask = 0x007FFFFE;
1639 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1640 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1641 bfd_vma check;
1642 bfd_signed_vma signed_check;
1643 bfd_vma add;
1644 bfd_signed_vma signed_add;
1645
1646 BFD_ASSERT (size == 4);
1647
1648 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1649 relocation -= (input_section->output_section->vma
1650 + input_section->output_offset);
1651
1652 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1653 relocation -= address;
1654
1655 /* No need to negate the relocation with BRANCH23. */
1656 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1657 /* howto->rightshift == 1 */
1658
1659 /* Drop unwanted bits from the value we are relocating to. */
1660 check = relocation >> howto->rightshift;
1661
1662 /* If this is a signed value, the rightshift just dropped
1663 leading 1 bits (assuming twos complement). */
1664 if ((bfd_signed_vma) relocation >= 0)
1665 signed_check = check;
1666 else
1667 signed_check = (check
1668 | ((bfd_vma) - 1
1669 & ~((bfd_vma) - 1 >> howto->rightshift)));
1670
1671 /* Get the value from the object file. */
1672 if (bfd_big_endian (input_bfd))
1673 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1674 else
1675 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1676
1677 /* Get the value from the object file with an appropriate sign.
1678 The expression involving howto->src_mask isolates the upper
1679 bit of src_mask. If that bit is set in the value we are
1680 adding, it is negative, and we subtract out that number times
1681 two. If src_mask includes the highest possible bit, then we
1682 can not get the upper bit, but that does not matter since
1683 signed_add needs no adjustment to become negative in that
1684 case. */
1685 signed_add = add;
1686
1687 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1688 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1689
1690 /* howto->bitpos == 0 */
1691 /* Add the value from the object file, shifted so that it is a
1692 straight number. */
1693 signed_check += signed_add;
1694 relocation += signed_add;
1695
1696 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1697
1698 /* Assumes two's complement. */
1699 if ( signed_check > reloc_signed_max
1700 || signed_check < reloc_signed_min)
1701 overflow = TRUE;
1702
1703 /* Put the relocation into the correct bits.
1704 For a BLX instruction, make sure that the relocation is rounded up
1705 to a word boundary. This follows the semantics of the instruction
1706 which specifies that bit 1 of the target address will come from bit
1707 1 of the base address. */
1708 if (bfd_big_endian (input_bfd))
1709 {
1710 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1711 relocation += 2;
1712 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1713 }
1714 else
1715 {
1716 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1717 relocation += 2;
1718 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1719 }
1720
1721 /* Add the relocation to the correct bits of X. */
1722 x = ((x & ~howto->dst_mask) | relocation);
1723
1724 /* Put the relocated value back in the object file. */
1725 bfd_put_32 (input_bfd, x, location);
1726
1727 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1728 }
1729 }
1730 #endif
1731 else
1732 #endif /* THUMBEXTENSION */
1733 if (info->relocatable && ! howto->partial_inplace)
1734 rstat = bfd_reloc_ok;
1735 else
1736 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1737 contents,
1738 rel->r_vaddr - input_section->vma,
1739 val, addend);
1740 #if 1 /* THUMBEXTENSION */
1741 /* FIXME:
1742 Is this the best way to fix up thumb addresses? krk@cygnus.com
1743 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1744 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1745 if (! info->relocatable
1746 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1747 {
1748 /* Determine if we need to set the bottom bit of a relocated address
1749 because the address is the address of a Thumb code symbol. */
1750
1751 int patchit = FALSE;
1752
1753 if (h != NULL
1754 && ( h->class == C_THUMBSTATFUNC
1755 || h->class == C_THUMBEXTFUNC))
1756 {
1757 patchit = TRUE;
1758 }
1759 else if (sym != NULL
1760 && sym->n_scnum > N_UNDEF)
1761 {
1762 /* No hash entry - use the symbol instead. */
1763
1764 if ( sym->n_sclass == C_THUMBSTATFUNC
1765 || sym->n_sclass == C_THUMBEXTFUNC)
1766 patchit = TRUE;
1767 }
1768
1769 if (patchit)
1770 {
1771 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1772 bfd_vma x = bfd_get_32 (input_bfd, location);
1773
1774 bfd_put_32 (input_bfd, x | 1, location);
1775 }
1776 }
1777 #endif /* THUMBEXTENSION */
1778
1779 switch (rstat)
1780 {
1781 default:
1782 abort ();
1783 case bfd_reloc_ok:
1784 break;
1785 case bfd_reloc_outofrange:
1786 (*_bfd_error_handler)
1787 (_("%B: bad reloc address 0x%lx in section `%A'"),
1788 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1789 return FALSE;
1790 case bfd_reloc_overflow:
1791 {
1792 const char *name;
1793 char buf[SYMNMLEN + 1];
1794
1795 if (symndx == -1)
1796 name = "*ABS*";
1797 else if (h != NULL)
1798 name = NULL;
1799 else
1800 {
1801 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1802 if (name == NULL)
1803 return FALSE;
1804 }
1805
1806 if (! ((*info->callbacks->reloc_overflow)
1807 (info, (h ? &h->root : NULL), name, howto->name,
1808 (bfd_vma) 0, input_bfd, input_section,
1809 rel->r_vaddr - input_section->vma)))
1810 return FALSE;
1811 }
1812 }
1813 }
1814
1815 return TRUE;
1816 }
1817
1818 #ifndef COFF_IMAGE_WITH_PE
1819
1820 bfd_boolean
1821 bfd_arm_allocate_interworking_sections (info)
1822 struct bfd_link_info * info;
1823 {
1824 asection * s;
1825 bfd_byte * foo;
1826 struct coff_arm_link_hash_table * globals;
1827 #if 0
1828 static char test_char = '1';
1829 #endif
1830
1831 globals = coff_arm_hash_table (info);
1832
1833 BFD_ASSERT (globals != NULL);
1834
1835 if (globals->arm_glue_size != 0)
1836 {
1837 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1838
1839 s = bfd_get_section_by_name
1840 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1841
1842 BFD_ASSERT (s != NULL);
1843
1844 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1845 globals->arm_glue_size);
1846 #if 0
1847 memset (foo, test_char, (size_t) globals->arm_glue_size);
1848 #endif
1849
1850 s->size = globals->arm_glue_size;
1851 s->contents = foo;
1852 }
1853
1854 if (globals->thumb_glue_size != 0)
1855 {
1856 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1857
1858 s = bfd_get_section_by_name
1859 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1860
1861 BFD_ASSERT (s != NULL);
1862
1863 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1864 globals->thumb_glue_size);
1865 #if 0
1866 memset (foo, test_char, (size_t) globals->thumb_glue_size);
1867 #endif
1868
1869 s->size = globals->thumb_glue_size;
1870 s->contents = foo;
1871 }
1872
1873 return TRUE;
1874 }
1875
1876 static void
1877 record_arm_to_thumb_glue (info, h)
1878 struct bfd_link_info * info;
1879 struct coff_link_hash_entry * h;
1880 {
1881 const char * name = h->root.root.string;
1882 register asection * s;
1883 char * tmp_name;
1884 struct coff_link_hash_entry * myh;
1885 struct bfd_link_hash_entry * bh;
1886 struct coff_arm_link_hash_table * globals;
1887 bfd_vma val;
1888 bfd_size_type amt;
1889
1890 globals = coff_arm_hash_table (info);
1891
1892 BFD_ASSERT (globals != NULL);
1893 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1894
1895 s = bfd_get_section_by_name
1896 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1897
1898 BFD_ASSERT (s != NULL);
1899
1900 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1901 tmp_name = (char *) bfd_malloc (amt);
1902
1903 BFD_ASSERT (tmp_name);
1904
1905 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1906
1907 myh = coff_link_hash_lookup
1908 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1909
1910 if (myh != NULL)
1911 {
1912 free (tmp_name);
1913 return; /* we've already seen this guy */
1914 }
1915
1916 /* The only trick here is using globals->arm_glue_size as the value. Even
1917 though the section isn't allocated yet, this is where we will be putting
1918 it. */
1919
1920 bh = NULL;
1921 val = globals->arm_glue_size + 1;
1922 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1923 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1924
1925 free (tmp_name);
1926
1927 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1928
1929 return;
1930 }
1931
1932 #ifndef ARM_WINCE
1933 static void
1934 record_thumb_to_arm_glue (info, h)
1935 struct bfd_link_info * info;
1936 struct coff_link_hash_entry * h;
1937 {
1938 const char * name = h->root.root.string;
1939 register asection * s;
1940 char * tmp_name;
1941 struct coff_link_hash_entry * myh;
1942 struct bfd_link_hash_entry * bh;
1943 struct coff_arm_link_hash_table * globals;
1944 bfd_vma val;
1945 bfd_size_type amt;
1946
1947 globals = coff_arm_hash_table (info);
1948
1949 BFD_ASSERT (globals != NULL);
1950 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1951
1952 s = bfd_get_section_by_name
1953 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1954
1955 BFD_ASSERT (s != NULL);
1956
1957 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1958 tmp_name = (char *) bfd_malloc (amt);
1959
1960 BFD_ASSERT (tmp_name);
1961
1962 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1963
1964 myh = coff_link_hash_lookup
1965 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1966
1967 if (myh != NULL)
1968 {
1969 free (tmp_name);
1970 return; /* we've already seen this guy */
1971 }
1972
1973 bh = NULL;
1974 val = globals->thumb_glue_size + 1;
1975 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1976 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1977
1978 /* If we mark it 'thumb', the disassembler will do a better job. */
1979 myh = (struct coff_link_hash_entry *) bh;
1980 myh->class = C_THUMBEXTFUNC;
1981
1982 free (tmp_name);
1983
1984 /* Allocate another symbol to mark where we switch to arm mode. */
1985
1986 #define CHANGE_TO_ARM "__%s_change_to_arm"
1987 #define BACK_FROM_ARM "__%s_back_from_arm"
1988
1989 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1990 tmp_name = (char *) bfd_malloc (amt);
1991
1992 BFD_ASSERT (tmp_name);
1993
1994 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1995
1996 bh = NULL;
1997 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1998 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1999 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
2000
2001 free (tmp_name);
2002
2003 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
2004
2005 return;
2006 }
2007 #endif /* not ARM_WINCE */
2008
2009 /* Select a BFD to be used to hold the sections used by the glue code.
2010 This function is called from the linker scripts in ld/emultempl/
2011 {armcoff/pe}.em */
2012
2013 bfd_boolean
2014 bfd_arm_get_bfd_for_interworking (abfd, info)
2015 bfd * abfd;
2016 struct bfd_link_info * info;
2017 {
2018 struct coff_arm_link_hash_table * globals;
2019 flagword flags;
2020 asection * sec;
2021
2022 /* If we are only performing a partial link do not bother
2023 getting a bfd to hold the glue. */
2024 if (info->relocatable)
2025 return TRUE;
2026
2027 globals = coff_arm_hash_table (info);
2028
2029 BFD_ASSERT (globals != NULL);
2030
2031 if (globals->bfd_of_glue_owner != NULL)
2032 return TRUE;
2033
2034 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2035
2036 if (sec == NULL)
2037 {
2038 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2039
2040 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2041
2042 if (sec == NULL
2043 || ! bfd_set_section_flags (abfd, sec, flags)
2044 || ! bfd_set_section_alignment (abfd, sec, 2))
2045 return FALSE;
2046 }
2047
2048 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2049
2050 if (sec == NULL)
2051 {
2052 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2053
2054 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2055
2056 if (sec == NULL
2057 || ! bfd_set_section_flags (abfd, sec, flags)
2058 || ! bfd_set_section_alignment (abfd, sec, 2))
2059 return FALSE;
2060 }
2061
2062 /* Save the bfd for later use. */
2063 globals->bfd_of_glue_owner = abfd;
2064
2065 return TRUE;
2066 }
2067
2068 bfd_boolean
2069 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2070 bfd * abfd;
2071 struct bfd_link_info * info;
2072 int support_old_code;
2073 {
2074 asection * sec;
2075 struct coff_arm_link_hash_table * globals;
2076
2077 /* If we are only performing a partial link do not bother
2078 to construct any glue. */
2079 if (info->relocatable)
2080 return TRUE;
2081
2082 /* Here we have a bfd that is to be included on the link. We have a hook
2083 to do reloc rummaging, before section sizes are nailed down. */
2084
2085 _bfd_coff_get_external_symbols (abfd);
2086
2087 globals = coff_arm_hash_table (info);
2088
2089 BFD_ASSERT (globals != NULL);
2090 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2091
2092 globals->support_old_code = support_old_code;
2093
2094 /* Rummage around all the relocs and map the glue vectors. */
2095 sec = abfd->sections;
2096
2097 if (sec == NULL)
2098 return TRUE;
2099
2100 for (; sec != NULL; sec = sec->next)
2101 {
2102 struct internal_reloc * i;
2103 struct internal_reloc * rel;
2104
2105 if (sec->reloc_count == 0)
2106 continue;
2107
2108 /* Load the relocs. */
2109 /* FIXME: there may be a storage leak here. */
2110
2111 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2112
2113 BFD_ASSERT (i != 0);
2114
2115 for (rel = i; rel < i + sec->reloc_count; ++rel)
2116 {
2117 unsigned short r_type = rel->r_type;
2118 long symndx;
2119 struct coff_link_hash_entry * h;
2120
2121 symndx = rel->r_symndx;
2122
2123 /* If the relocation is not against a symbol it cannot concern us. */
2124 if (symndx == -1)
2125 continue;
2126
2127 /* If the index is outside of the range of our table, something has gone wrong. */
2128 if (symndx >= obj_conv_table_size (abfd))
2129 {
2130 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2131 abfd, symndx);
2132 continue;
2133 }
2134
2135 h = obj_coff_sym_hashes (abfd)[symndx];
2136
2137 /* If the relocation is against a static symbol it must be within
2138 the current section and so cannot be a cross ARM/Thumb relocation. */
2139 if (h == NULL)
2140 continue;
2141
2142 switch (r_type)
2143 {
2144 case ARM_26:
2145 /* This one is a call from arm code. We need to look up
2146 the target of the call. If it is a thumb target, we
2147 insert glue. */
2148
2149 if (h->class == C_THUMBEXTFUNC)
2150 record_arm_to_thumb_glue (info, h);
2151 break;
2152
2153 #ifndef ARM_WINCE
2154 case ARM_THUMB23:
2155 /* This one is a call from thumb code. We used to look
2156 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2157 up the target of the call. If it is an arm target, we
2158 insert glue. If the symbol does not exist it will be
2159 given a class of C_EXT and so we will generate a stub
2160 for it. This is not really a problem, since the link
2161 is doomed anyway. */
2162
2163 switch (h->class)
2164 {
2165 case C_EXT:
2166 case C_STAT:
2167 case C_LABEL:
2168 record_thumb_to_arm_glue (info, h);
2169 break;
2170 default:
2171 ;
2172 }
2173 break;
2174 #endif
2175
2176 default:
2177 break;
2178 }
2179 }
2180 }
2181
2182 return TRUE;
2183 }
2184
2185 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2186
2187 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2188 #define coff_relocate_section coff_arm_relocate_section
2189 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2190 #define coff_adjust_symndx coff_arm_adjust_symndx
2191 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2192 #define coff_final_link_postscript coff_arm_final_link_postscript
2193 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2194 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2195 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2196 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2197 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2198
2199 /* When doing a relocatable link, we want to convert ARM_26 relocs
2200 into ARM_26D relocs. */
2201
2202 static bfd_boolean
2203 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2204 bfd *obfd ATTRIBUTE_UNUSED;
2205 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2206 bfd *ibfd;
2207 asection *sec;
2208 struct internal_reloc *irel;
2209 bfd_boolean *adjustedp;
2210 {
2211 if (irel->r_type == ARM_26)
2212 {
2213 struct coff_link_hash_entry *h;
2214
2215 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2216 if (h != NULL
2217 && (h->root.type == bfd_link_hash_defined
2218 || h->root.type == bfd_link_hash_defweak)
2219 && h->root.u.def.section->output_section == sec->output_section)
2220 irel->r_type = ARM_26D;
2221 }
2222 *adjustedp = FALSE;
2223 return TRUE;
2224 }
2225
2226 /* Called when merging the private data areas of two BFDs.
2227 This is important as it allows us to detect if we are
2228 attempting to merge binaries compiled for different ARM
2229 targets, eg different CPUs or different APCS's. */
2230
2231 static bfd_boolean
2232 coff_arm_merge_private_bfd_data (ibfd, obfd)
2233 bfd * ibfd;
2234 bfd * obfd;
2235 {
2236 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2237
2238 if (ibfd == obfd)
2239 return TRUE;
2240
2241 /* If the two formats are different we cannot merge anything.
2242 This is not an error, since it is permissable to change the
2243 input and output formats. */
2244 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2245 || obfd->xvec->flavour != bfd_target_coff_flavour)
2246 return TRUE;
2247
2248 /* Determine what should happen if the input ARM architecture
2249 does not match the output ARM architecture. */
2250 if (! bfd_arm_merge_machines (ibfd, obfd))
2251 return FALSE;
2252
2253 /* Verify that the APCS is the same for the two BFDs. */
2254 if (APCS_SET (ibfd))
2255 {
2256 if (APCS_SET (obfd))
2257 {
2258 /* If the src and dest have different APCS flag bits set, fail. */
2259 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2260 {
2261 _bfd_error_handler
2262 /* xgettext: c-format */
2263 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2264 ibfd, obfd,
2265 APCS_26_FLAG (ibfd) ? 26 : 32,
2266 APCS_26_FLAG (obfd) ? 26 : 32
2267 );
2268
2269 bfd_set_error (bfd_error_wrong_format);
2270 return FALSE;
2271 }
2272
2273 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2274 {
2275 const char *msg;
2276
2277 if (APCS_FLOAT_FLAG (ibfd))
2278 /* xgettext: c-format */
2279 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2280 else
2281 /* xgettext: c-format */
2282 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2283
2284 _bfd_error_handler (msg, ibfd, obfd);
2285
2286 bfd_set_error (bfd_error_wrong_format);
2287 return FALSE;
2288 }
2289
2290 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2291 {
2292 const char * msg;
2293
2294 if (PIC_FLAG (ibfd))
2295 /* xgettext: c-format */
2296 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2297 else
2298 /* xgettext: c-format */
2299 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2300 _bfd_error_handler (msg, ibfd, obfd);
2301
2302 bfd_set_error (bfd_error_wrong_format);
2303 return FALSE;
2304 }
2305 }
2306 else
2307 {
2308 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2309
2310 /* Set up the arch and fields as well as these are probably wrong. */
2311 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2312 }
2313 }
2314
2315 /* Check the interworking support. */
2316 if (INTERWORK_SET (ibfd))
2317 {
2318 if (INTERWORK_SET (obfd))
2319 {
2320 /* If the src and dest differ in their interworking issue a warning. */
2321 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2322 {
2323 const char * msg;
2324
2325 if (INTERWORK_FLAG (ibfd))
2326 /* xgettext: c-format */
2327 msg = _("Warning: %B supports interworking, whereas %B does not");
2328 else
2329 /* xgettext: c-format */
2330 msg = _("Warning: %B does not support interworking, whereas %B does");
2331
2332 _bfd_error_handler (msg, ibfd, obfd);
2333 }
2334 }
2335 else
2336 {
2337 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2338 }
2339 }
2340
2341 return TRUE;
2342 }
2343
2344 /* Display the flags field. */
2345
2346 static bfd_boolean
2347 coff_arm_print_private_bfd_data (abfd, ptr)
2348 bfd * abfd;
2349 PTR ptr;
2350 {
2351 FILE * file = (FILE *) ptr;
2352
2353 BFD_ASSERT (abfd != NULL && ptr != NULL);
2354
2355 /* xgettext:c-format */
2356 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2357
2358 if (APCS_SET (abfd))
2359 {
2360 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2361 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2362
2363 if (APCS_FLOAT_FLAG (abfd))
2364 fprintf (file, _(" [floats passed in float registers]"));
2365 else
2366 fprintf (file, _(" [floats passed in integer registers]"));
2367
2368 if (PIC_FLAG (abfd))
2369 fprintf (file, _(" [position independent]"));
2370 else
2371 fprintf (file, _(" [absolute position]"));
2372 }
2373
2374 if (! INTERWORK_SET (abfd))
2375 fprintf (file, _(" [interworking flag not initialised]"));
2376 else if (INTERWORK_FLAG (abfd))
2377 fprintf (file, _(" [interworking supported]"));
2378 else
2379 fprintf (file, _(" [interworking not supported]"));
2380
2381 fputc ('\n', file);
2382
2383 return TRUE;
2384 }
2385
2386 /* Copies the given flags into the coff_tdata.flags field.
2387 Typically these flags come from the f_flags[] field of
2388 the COFF filehdr structure, which contains important,
2389 target specific information.
2390 Note: Although this function is static, it is explicitly
2391 called from both coffcode.h and peicode.h. */
2392
2393 static bfd_boolean
2394 _bfd_coff_arm_set_private_flags (abfd, flags)
2395 bfd * abfd;
2396 flagword flags;
2397 {
2398 flagword flag;
2399
2400 BFD_ASSERT (abfd != NULL);
2401
2402 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2403
2404 /* Make sure that the APCS field has not been initialised to the opposite
2405 value. */
2406 if (APCS_SET (abfd)
2407 && ( (APCS_26_FLAG (abfd) != flag)
2408 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2409 || (PIC_FLAG (abfd) != (flags & F_PIC))
2410 ))
2411 return FALSE;
2412
2413 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2414
2415 SET_APCS_FLAGS (abfd, flag);
2416
2417 flag = (flags & F_INTERWORK);
2418
2419 /* If the BFD has already had its interworking flag set, but it
2420 is different from the value that we have been asked to set,
2421 then assume that that merged code will not support interworking
2422 and set the flag accordingly. */
2423 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2424 {
2425 if (flag)
2426 /* xgettext: c-format */
2427 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2428 abfd);
2429 else
2430 /* xgettext: c-format */
2431 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2432 abfd);
2433 flag = 0;
2434 }
2435
2436 SET_INTERWORK_FLAG (abfd, flag);
2437
2438 return TRUE;
2439 }
2440
2441 /* Copy the important parts of the target specific data
2442 from one instance of a BFD to another. */
2443
2444 static bfd_boolean
2445 coff_arm_copy_private_bfd_data (src, dest)
2446 bfd * src;
2447 bfd * dest;
2448 {
2449 BFD_ASSERT (src != NULL && dest != NULL);
2450
2451 if (src == dest)
2452 return TRUE;
2453
2454 /* If the destination is not in the same format as the source, do not do
2455 the copy. */
2456 if (src->xvec != dest->xvec)
2457 return TRUE;
2458
2459 /* copy the flags field */
2460 if (APCS_SET (src))
2461 {
2462 if (APCS_SET (dest))
2463 {
2464 /* If the src and dest have different APCS flag bits set, fail. */
2465 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2466 return FALSE;
2467
2468 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2469 return FALSE;
2470
2471 if (PIC_FLAG (dest) != PIC_FLAG (src))
2472 return FALSE;
2473 }
2474 else
2475 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2476 | PIC_FLAG (src));
2477 }
2478
2479 if (INTERWORK_SET (src))
2480 {
2481 if (INTERWORK_SET (dest))
2482 {
2483 /* If the src and dest have different interworking flags then turn
2484 off the interworking bit. */
2485 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2486 {
2487 if (INTERWORK_FLAG (dest))
2488 {
2489 /* xgettext:c-format */
2490 _bfd_error_handler (("\
2491 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2492 dest, src);
2493 }
2494
2495 SET_INTERWORK_FLAG (dest, 0);
2496 }
2497 }
2498 else
2499 {
2500 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2501 }
2502 }
2503
2504 return TRUE;
2505 }
2506
2507 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2508 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2509 #define LOCAL_LABEL_PREFIX ""
2510 #ifndef USER_LABEL_PREFIX
2511 #define USER_LABEL_PREFIX "_"
2512 #endif
2513
2514 /* Like _bfd_coff_is_local_label_name, but
2515 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2516 non-local.
2517 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2518 labels of the form Lxxx to be stripped. */
2519 static bfd_boolean
2520 coff_arm_is_local_label_name (abfd, name)
2521 bfd * abfd ATTRIBUTE_UNUSED;
2522 const char * name;
2523 {
2524 #ifdef USER_LABEL_PREFIX
2525 if (USER_LABEL_PREFIX[0] != 0)
2526 {
2527 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2528 return FALSE;
2529 }
2530 #endif
2531
2532 #ifdef LOCAL_LABEL_PREFIX
2533 /* If there is a prefix for local labels then look for this.
2534 If the prefix exists, but it is empty, then ignore the test. */
2535
2536 if (LOCAL_LABEL_PREFIX[0] != 0)
2537 {
2538 size_t len = strlen (LOCAL_LABEL_PREFIX);
2539
2540 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2541 return FALSE;
2542
2543 /* Perform the checks below for the rest of the name. */
2544 name += len;
2545 }
2546 #endif
2547
2548 return name[0] == 'L';
2549 }
2550
2551 /* This piece of machinery exists only to guarantee that the bfd that holds
2552 the glue section is written last.
2553
2554 This does depend on bfd_make_section attaching a new section to the
2555 end of the section list for the bfd.
2556
2557 krk@cygnus.com */
2558
2559 static bfd_boolean
2560 coff_arm_link_output_has_begun (sub, info)
2561 bfd * sub;
2562 struct coff_final_link_info * info;
2563 {
2564 return (sub->output_has_begun
2565 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2566 }
2567
2568 static bfd_boolean
2569 coff_arm_final_link_postscript (abfd, pfinfo)
2570 bfd * abfd ATTRIBUTE_UNUSED;
2571 struct coff_final_link_info * pfinfo;
2572 {
2573 struct coff_arm_link_hash_table * globals;
2574
2575 globals = coff_arm_hash_table (pfinfo->info);
2576
2577 BFD_ASSERT (globals != NULL);
2578
2579 if (globals->bfd_of_glue_owner != NULL)
2580 {
2581 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2582 return FALSE;
2583
2584 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2585 }
2586
2587 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2588 }
2589
2590 #include "coffcode.h"
2591
2592 #ifndef TARGET_LITTLE_SYM
2593 #define TARGET_LITTLE_SYM armcoff_little_vec
2594 #endif
2595 #ifndef TARGET_LITTLE_NAME
2596 #define TARGET_LITTLE_NAME "coff-arm-little"
2597 #endif
2598 #ifndef TARGET_BIG_SYM
2599 #define TARGET_BIG_SYM armcoff_big_vec
2600 #endif
2601 #ifndef TARGET_BIG_NAME
2602 #define TARGET_BIG_NAME "coff-arm-big"
2603 #endif
2604
2605 #ifndef TARGET_UNDERSCORE
2606 #define TARGET_UNDERSCORE 0
2607 #endif
2608
2609 #ifndef EXTRA_S_FLAGS
2610 #ifdef COFF_WITH_PE
2611 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2612 #else
2613 #define EXTRA_S_FLAGS SEC_CODE
2614 #endif
2615 #endif
2616
2617 /* Forward declaration for use initialising alternative_target field. */
2618 extern const bfd_target TARGET_BIG_SYM ;
2619
2620 /* Target vectors. */
2621 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2622 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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