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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 (_("%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 relocatable link. However, we want to convert
1251 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1252 this case without pcrel_offset set, and adjust the addend to
1253 compensate. 'partial_inplace' is also set, since we want 'done'
1254 relocations to be reflected in section's data. */
1255 if (rel->r_type == ARM_26
1256 && h != NULL
1257 && info->relocatable
1258 && (h->root.type == bfd_link_hash_defined
1259 || h->root.type == bfd_link_hash_defweak)
1260 && (h->root.u.def.section->output_section
1261 == input_section->output_section))
1262 {
1263 static reloc_howto_type fake_arm26_reloc =
1264 HOWTO (ARM_26,
1265 2,
1266 2,
1267 24,
1268 TRUE,
1269 0,
1270 complain_overflow_signed,
1271 aoutarm_fix_pcrel_26 ,
1272 "ARM_26",
1273 TRUE,
1274 0x00ffffff,
1275 0x00ffffff,
1276 FALSE);
1277
1278 addend -= rel->r_vaddr - input_section->vma;
1279 #ifdef ARM_WINCE
1280 /* FIXME: I don't know why, but the hack is necessary for correct
1281 generation of bl's instruction offset. */
1282 addend -= 8;
1283 #endif
1284 howto = &fake_arm26_reloc;
1285 }
1286
1287 #ifdef ARM_WINCE
1288 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1289 the next opcode's pc, so is off by one. */
1290 #if 0 /* This appears to have been true for WINCE 2.0, but it is not
1291 true for WINCE 3.0. */
1292 if (howto->pc_relative && !info->relocatable)
1293 addend -= 8;
1294 #endif
1295 #endif
1296
1297 /* If we are doing a relocatable link, then we can just ignore
1298 a PC relative reloc that is pcrel_offset. It will already
1299 have the correct value. If this is not a relocatable link,
1300 then we should ignore the symbol value. */
1301 if (howto->pc_relative && howto->pcrel_offset)
1302 {
1303 if (info->relocatable)
1304 continue;
1305 /* FIXME - it is not clear which targets need this next test
1306 and which do not. It is known that it is needed for the
1307 VxWorks and EPOC-PE targets, but it is also known that it
1308 was suppressed for other ARM targets. This ought to be
1309 sorted out one day. */
1310 #ifdef ARM_COFF_BUGFIX
1311 /* We must not ignore the symbol value. If the symbol is
1312 within the same section, the relocation should have already
1313 been fixed, but if it is not, we'll be handed a reloc into
1314 the beginning of the symbol's section, so we must not cancel
1315 out the symbol's value, otherwise we'll be adding it in
1316 twice. */
1317 if (sym != NULL && sym->n_scnum != 0)
1318 addend += sym->n_value;
1319 #endif
1320 }
1321
1322 val = 0;
1323
1324 if (h == NULL)
1325 {
1326 asection *sec;
1327
1328 if (symndx == -1)
1329 {
1330 sec = bfd_abs_section_ptr;
1331 val = 0;
1332 }
1333 else
1334 {
1335 sec = sections[symndx];
1336 val = (sec->output_section->vma
1337 + sec->output_offset
1338 + sym->n_value
1339 - sec->vma);
1340 }
1341 }
1342 else
1343 {
1344 #if 1 /* THUMBEXTENSION */
1345 /* We don't output the stubs if we are generating a
1346 relocatable output file, since we may as well leave the
1347 stub generation to the final linker pass. If we fail to
1348 verify that the name is defined, we'll try to build stubs
1349 for an undefined name... */
1350 if (! info->relocatable
1351 && ( h->root.type == bfd_link_hash_defined
1352 || h->root.type == bfd_link_hash_defweak))
1353 {
1354 asection * h_sec = h->root.u.def.section;
1355 const char * name = h->root.root.string;
1356
1357 /* h locates the symbol referenced in the reloc. */
1358 h_val = (h->root.u.def.value
1359 + h_sec->output_section->vma
1360 + h_sec->output_offset);
1361
1362 if (howto->type == ARM_26)
1363 {
1364 if ( h->class == C_THUMBSTATFUNC
1365 || h->class == C_THUMBEXTFUNC)
1366 {
1367 /* Arm code calling a Thumb function. */
1368 unsigned long int tmp;
1369 bfd_vma my_offset;
1370 asection * s;
1371 long int ret_offset;
1372 struct coff_link_hash_entry * myh;
1373 struct coff_arm_link_hash_table * globals;
1374
1375 myh = find_arm_glue (info, name, input_bfd);
1376 if (myh == NULL)
1377 return FALSE;
1378
1379 globals = coff_arm_hash_table (info);
1380
1381 BFD_ASSERT (globals != NULL);
1382 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1383
1384 my_offset = myh->root.u.def.value;
1385
1386 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1387 ARM2THUMB_GLUE_SECTION_NAME);
1388 BFD_ASSERT (s != NULL);
1389 BFD_ASSERT (s->contents != NULL);
1390 BFD_ASSERT (s->output_section != NULL);
1391
1392 if ((my_offset & 0x01) == 0x01)
1393 {
1394 if (h_sec->owner != NULL
1395 && INTERWORK_SET (h_sec->owner)
1396 && ! INTERWORK_FLAG (h_sec->owner))
1397 {
1398 _bfd_error_handler
1399 /* xgettext:c-format */
1400 (_("%s(%s): warning: interworking not enabled."),
1401 bfd_archive_filename (h_sec->owner), name);
1402 _bfd_error_handler
1403 /* xgettext:c-format */
1404 (_(" first occurrence: %s: arm call to thumb"),
1405 bfd_archive_filename (input_bfd));
1406 }
1407
1408 --my_offset;
1409 myh->root.u.def.value = my_offset;
1410
1411 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1412 s->contents + my_offset);
1413
1414 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1415 s->contents + my_offset + 4);
1416
1417 /* It's a thumb address. Add the low order bit. */
1418 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1419 s->contents + my_offset + 8);
1420
1421 if (info->base_file)
1422 arm_emit_base_file_entry (info, output_bfd, s,
1423 my_offset + 8);
1424
1425 }
1426
1427 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1428
1429 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1430 - input_section->vma);
1431
1432 tmp = tmp & 0xFF000000;
1433
1434 /* Somehow these are both 4 too far, so subtract 8. */
1435 ret_offset =
1436 s->output_offset
1437 + my_offset
1438 + s->output_section->vma
1439 - (input_section->output_offset
1440 + input_section->output_section->vma
1441 + rel->r_vaddr)
1442 - 8;
1443
1444 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1445
1446 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1447 contents + rel->r_vaddr - input_section->vma);
1448 done = 1;
1449 }
1450 }
1451
1452 #ifndef ARM_WINCE
1453 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1454 else if (howto->type == ARM_THUMB23)
1455 {
1456 if ( h->class == C_EXT
1457 || h->class == C_STAT
1458 || h->class == C_LABEL)
1459 {
1460 /* Thumb code calling an ARM function */
1461 asection * s = 0;
1462 bfd_vma my_offset;
1463 unsigned long int tmp;
1464 long int ret_offset;
1465 struct coff_link_hash_entry * myh;
1466 struct coff_arm_link_hash_table * globals;
1467
1468 myh = find_thumb_glue (info, name, input_bfd);
1469 if (myh == NULL)
1470 return FALSE;
1471
1472 globals = coff_arm_hash_table (info);
1473
1474 BFD_ASSERT (globals != NULL);
1475 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1476
1477 my_offset = myh->root.u.def.value;
1478
1479 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1480 THUMB2ARM_GLUE_SECTION_NAME);
1481
1482 BFD_ASSERT (s != NULL);
1483 BFD_ASSERT (s->contents != NULL);
1484 BFD_ASSERT (s->output_section != NULL);
1485
1486 if ((my_offset & 0x01) == 0x01)
1487 {
1488 if (h_sec->owner != NULL
1489 && INTERWORK_SET (h_sec->owner)
1490 && ! INTERWORK_FLAG (h_sec->owner)
1491 && ! globals->support_old_code)
1492 {
1493 _bfd_error_handler
1494 /* xgettext:c-format */
1495 (_("%s(%s): warning: interworking not enabled."),
1496 bfd_archive_filename (h_sec->owner), name);
1497 _bfd_error_handler
1498 /* xgettext:c-format */
1499 (_(" first occurrence: %s: thumb call to arm"),
1500 bfd_archive_filename (input_bfd));
1501 _bfd_error_handler
1502 (_(" consider relinking with --support-old-code enabled"));
1503 }
1504
1505 -- my_offset;
1506 myh->root.u.def.value = my_offset;
1507
1508 if (globals->support_old_code)
1509 {
1510 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1511 s->contents + my_offset);
1512
1513 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1514 s->contents + my_offset + 2);
1515
1516 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1517 s->contents + my_offset + 4);
1518
1519 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1520 s->contents + my_offset + 6);
1521
1522 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1523 s->contents + my_offset + 8);
1524
1525 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1526 s->contents + my_offset + 12);
1527
1528 /* Store the address of the function in the last word of the stub. */
1529 bfd_put_32 (output_bfd, h_val,
1530 s->contents + my_offset + 16);
1531
1532 if (info->base_file)
1533 arm_emit_base_file_entry (info, output_bfd, s,
1534 my_offset + 16);
1535 }
1536 else
1537 {
1538 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1539 s->contents + my_offset);
1540
1541 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1542 s->contents + my_offset + 2);
1543
1544 ret_offset =
1545 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1546 - ((bfd_signed_vma)
1547 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1548 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1549 + s->output_section->vma) /* Address of the start of the current section. */
1550 + 4 /* The branch instruction is 4 bytes into the stub. */
1551 + 8); /* ARM branches work from the pc of the instruction + 8. */
1552
1553 bfd_put_32 (output_bfd,
1554 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1555 s->contents + my_offset + 4);
1556
1557 }
1558 }
1559
1560 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1561
1562 /* Now go back and fix up the original BL insn to point
1563 to here. */
1564 ret_offset =
1565 s->output_offset
1566 + my_offset
1567 - (input_section->output_offset
1568 + rel->r_vaddr)
1569 -4;
1570
1571 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1572 - input_section->vma);
1573
1574 bfd_put_32 (output_bfd,
1575 (bfd_vma) insert_thumb_branch (tmp,
1576 ret_offset),
1577 contents + rel->r_vaddr - input_section->vma);
1578
1579 done = 1;
1580 }
1581 }
1582 #endif
1583 }
1584
1585 /* If the relocation type and destination symbol does not
1586 fall into one of the above categories, then we can just
1587 perform a direct link. */
1588
1589 if (done)
1590 rstat = bfd_reloc_ok;
1591 else
1592 #endif /* THUMBEXTENSION */
1593 if ( h->root.type == bfd_link_hash_defined
1594 || h->root.type == bfd_link_hash_defweak)
1595 {
1596 asection *sec;
1597
1598 sec = h->root.u.def.section;
1599 val = (h->root.u.def.value
1600 + sec->output_section->vma
1601 + sec->output_offset);
1602 }
1603
1604 else if (! info->relocatable)
1605 {
1606 if (! ((*info->callbacks->undefined_symbol)
1607 (info, h->root.root.string, input_bfd, input_section,
1608 rel->r_vaddr - input_section->vma, TRUE)))
1609 return FALSE;
1610 }
1611 }
1612
1613 if (info->base_file)
1614 {
1615 /* Emit a reloc if the backend thinks it needs it. */
1616 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1617 arm_emit_base_file_entry (info, output_bfd, input_section,
1618 rel->r_vaddr);
1619 }
1620
1621 #if 1 /* THUMBEXTENSION */
1622 if (done)
1623 rstat = bfd_reloc_ok;
1624 #ifndef ARM_WINCE
1625 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1626 else if (! info->relocatable
1627 && howto->type == ARM_THUMB23)
1628 {
1629 /* This is pretty much a copy of what the default
1630 _bfd_final_link_relocate and _bfd_relocate_contents
1631 routines do to perform a relocation, with special
1632 processing for the split addressing of the Thumb BL
1633 instruction. Again, it would probably be simpler adding a
1634 ThumbBRANCH23 specific macro expansion into the default
1635 code. */
1636
1637 bfd_vma address = rel->r_vaddr - input_section->vma;
1638 bfd_size_type sz;
1639
1640 sz = (input_section->rawsize
1641 ? input_section->rawsize
1642 : input_section->size);
1643 if (address > sz)
1644 rstat = bfd_reloc_outofrange;
1645 else
1646 {
1647 bfd_vma relocation = val + addend;
1648 int size = bfd_get_reloc_size (howto);
1649 bfd_boolean overflow = FALSE;
1650 bfd_byte *location = contents + address;
1651 bfd_vma x = bfd_get_32 (input_bfd, location);
1652 bfd_vma src_mask = 0x007FFFFE;
1653 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1654 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1655 bfd_vma check;
1656 bfd_signed_vma signed_check;
1657 bfd_vma add;
1658 bfd_signed_vma signed_add;
1659
1660 BFD_ASSERT (size == 4);
1661
1662 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1663 relocation -= (input_section->output_section->vma
1664 + input_section->output_offset);
1665
1666 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1667 relocation -= address;
1668
1669 /* No need to negate the relocation with BRANCH23. */
1670 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1671 /* howto->rightshift == 1 */
1672
1673 /* Drop unwanted bits from the value we are relocating to. */
1674 check = relocation >> howto->rightshift;
1675
1676 /* If this is a signed value, the rightshift just dropped
1677 leading 1 bits (assuming twos complement). */
1678 if ((bfd_signed_vma) relocation >= 0)
1679 signed_check = check;
1680 else
1681 signed_check = (check
1682 | ((bfd_vma) - 1
1683 & ~((bfd_vma) - 1 >> howto->rightshift)));
1684
1685 /* Get the value from the object file. */
1686 if (bfd_big_endian (input_bfd))
1687 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1688 else
1689 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1690
1691 /* Get the value from the object file with an appropriate sign.
1692 The expression involving howto->src_mask isolates the upper
1693 bit of src_mask. If that bit is set in the value we are
1694 adding, it is negative, and we subtract out that number times
1695 two. If src_mask includes the highest possible bit, then we
1696 can not get the upper bit, but that does not matter since
1697 signed_add needs no adjustment to become negative in that
1698 case. */
1699 signed_add = add;
1700
1701 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1702 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1703
1704 /* howto->bitpos == 0 */
1705 /* Add the value from the object file, shifted so that it is a
1706 straight number. */
1707 signed_check += signed_add;
1708 relocation += signed_add;
1709
1710 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1711
1712 /* Assumes two's complement. */
1713 if ( signed_check > reloc_signed_max
1714 || signed_check < reloc_signed_min)
1715 overflow = TRUE;
1716
1717 /* Put the relocation into the correct bits.
1718 For a BLX instruction, make sure that the relocation is rounded up
1719 to a word boundary. This follows the semantics of the instruction
1720 which specifies that bit 1 of the target address will come from bit
1721 1 of the base address. */
1722 if (bfd_big_endian (input_bfd))
1723 {
1724 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1725 relocation += 2;
1726 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1727 }
1728 else
1729 {
1730 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1731 relocation += 2;
1732 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1733 }
1734
1735 /* Add the relocation to the correct bits of X. */
1736 x = ((x & ~howto->dst_mask) | relocation);
1737
1738 /* Put the relocated value back in the object file. */
1739 bfd_put_32 (input_bfd, x, location);
1740
1741 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1742 }
1743 }
1744 #endif
1745 else
1746 #endif /* THUMBEXTENSION */
1747 if (info->relocatable && ! howto->partial_inplace)
1748 rstat = bfd_reloc_ok;
1749 else
1750 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1751 contents,
1752 rel->r_vaddr - input_section->vma,
1753 val, addend);
1754 #if 1 /* THUMBEXTENSION */
1755 /* FIXME:
1756 Is this the best way to fix up thumb addresses? krk@cygnus.com
1757 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1758 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1759 if (! info->relocatable
1760 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1761 {
1762 /* Determine if we need to set the bottom bit of a relocated address
1763 because the address is the address of a Thumb code symbol. */
1764
1765 int patchit = FALSE;
1766
1767 if (h != NULL
1768 && ( h->class == C_THUMBSTATFUNC
1769 || h->class == C_THUMBEXTFUNC))
1770 {
1771 patchit = TRUE;
1772 }
1773 else if (sym != NULL
1774 && sym->n_scnum > N_UNDEF)
1775 {
1776 /* No hash entry - use the symbol instead. */
1777
1778 if ( sym->n_sclass == C_THUMBSTATFUNC
1779 || sym->n_sclass == C_THUMBEXTFUNC)
1780 patchit = TRUE;
1781 }
1782
1783 if (patchit)
1784 {
1785 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1786 bfd_vma x = bfd_get_32 (input_bfd, location);
1787
1788 bfd_put_32 (input_bfd, x | 1, location);
1789 }
1790 }
1791 #endif /* THUMBEXTENSION */
1792
1793 switch (rstat)
1794 {
1795 default:
1796 abort ();
1797 case bfd_reloc_ok:
1798 break;
1799 case bfd_reloc_outofrange:
1800 (*_bfd_error_handler)
1801 (_("%s: bad reloc address 0x%lx in section `%s'"),
1802 bfd_archive_filename (input_bfd),
1803 (unsigned long) rel->r_vaddr,
1804 bfd_get_section_name (input_bfd, input_section));
1805 return FALSE;
1806 case bfd_reloc_overflow:
1807 {
1808 const char *name;
1809 char buf[SYMNMLEN + 1];
1810
1811 if (symndx == -1)
1812 name = "*ABS*";
1813 else if (h != NULL)
1814 name = h->root.root.string;
1815 else
1816 {
1817 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1818 if (name == NULL)
1819 return FALSE;
1820 }
1821
1822 if (! ((*info->callbacks->reloc_overflow)
1823 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1824 input_section, rel->r_vaddr - input_section->vma)))
1825 return FALSE;
1826 }
1827 }
1828 }
1829
1830 return TRUE;
1831 }
1832
1833 #ifndef COFF_IMAGE_WITH_PE
1834
1835 bfd_boolean
1836 bfd_arm_allocate_interworking_sections (info)
1837 struct bfd_link_info * info;
1838 {
1839 asection * s;
1840 bfd_byte * foo;
1841 struct coff_arm_link_hash_table * globals;
1842 #if 0
1843 static char test_char = '1';
1844 #endif
1845
1846 globals = coff_arm_hash_table (info);
1847
1848 BFD_ASSERT (globals != NULL);
1849
1850 if (globals->arm_glue_size != 0)
1851 {
1852 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1853
1854 s = bfd_get_section_by_name
1855 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1856
1857 BFD_ASSERT (s != NULL);
1858
1859 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1860 globals->arm_glue_size);
1861 #if 0
1862 memset (foo, test_char, (size_t) globals->arm_glue_size);
1863 #endif
1864
1865 s->size = globals->arm_glue_size;
1866 s->contents = foo;
1867 }
1868
1869 if (globals->thumb_glue_size != 0)
1870 {
1871 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1872
1873 s = bfd_get_section_by_name
1874 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1875
1876 BFD_ASSERT (s != NULL);
1877
1878 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1879 globals->thumb_glue_size);
1880 #if 0
1881 memset (foo, test_char, (size_t) globals->thumb_glue_size);
1882 #endif
1883
1884 s->size = globals->thumb_glue_size;
1885 s->contents = foo;
1886 }
1887
1888 return TRUE;
1889 }
1890
1891 static void
1892 record_arm_to_thumb_glue (info, h)
1893 struct bfd_link_info * info;
1894 struct coff_link_hash_entry * h;
1895 {
1896 const char * name = h->root.root.string;
1897 register asection * s;
1898 char * tmp_name;
1899 struct coff_link_hash_entry * myh;
1900 struct bfd_link_hash_entry * bh;
1901 struct coff_arm_link_hash_table * globals;
1902 bfd_vma val;
1903 bfd_size_type amt;
1904
1905 globals = coff_arm_hash_table (info);
1906
1907 BFD_ASSERT (globals != NULL);
1908 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1909
1910 s = bfd_get_section_by_name
1911 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1912
1913 BFD_ASSERT (s != NULL);
1914
1915 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1916 tmp_name = (char *) bfd_malloc (amt);
1917
1918 BFD_ASSERT (tmp_name);
1919
1920 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1921
1922 myh = coff_link_hash_lookup
1923 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1924
1925 if (myh != NULL)
1926 {
1927 free (tmp_name);
1928 return; /* we've already seen this guy */
1929 }
1930
1931 /* The only trick here is using globals->arm_glue_size as the value. Even
1932 though the section isn't allocated yet, this is where we will be putting
1933 it. */
1934
1935 bh = NULL;
1936 val = globals->arm_glue_size + 1;
1937 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1938 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1939
1940 free (tmp_name);
1941
1942 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1943
1944 return;
1945 }
1946
1947 #ifndef ARM_WINCE
1948 static void
1949 record_thumb_to_arm_glue (info, h)
1950 struct bfd_link_info * info;
1951 struct coff_link_hash_entry * h;
1952 {
1953 const char * name = h->root.root.string;
1954 register asection * s;
1955 char * tmp_name;
1956 struct coff_link_hash_entry * myh;
1957 struct bfd_link_hash_entry * bh;
1958 struct coff_arm_link_hash_table * globals;
1959 bfd_vma val;
1960 bfd_size_type amt;
1961
1962 globals = coff_arm_hash_table (info);
1963
1964 BFD_ASSERT (globals != NULL);
1965 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1966
1967 s = bfd_get_section_by_name
1968 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1969
1970 BFD_ASSERT (s != NULL);
1971
1972 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1973 tmp_name = (char *) bfd_malloc (amt);
1974
1975 BFD_ASSERT (tmp_name);
1976
1977 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1978
1979 myh = coff_link_hash_lookup
1980 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1981
1982 if (myh != NULL)
1983 {
1984 free (tmp_name);
1985 return; /* we've already seen this guy */
1986 }
1987
1988 bh = NULL;
1989 val = globals->thumb_glue_size + 1;
1990 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1991 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1992
1993 /* If we mark it 'thumb', the disassembler will do a better job. */
1994 myh = (struct coff_link_hash_entry *) bh;
1995 myh->class = C_THUMBEXTFUNC;
1996
1997 free (tmp_name);
1998
1999 /* Allocate another symbol to mark where we switch to arm mode. */
2000
2001 #define CHANGE_TO_ARM "__%s_change_to_arm"
2002 #define BACK_FROM_ARM "__%s_back_from_arm"
2003
2004 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
2005 tmp_name = (char *) bfd_malloc (amt);
2006
2007 BFD_ASSERT (tmp_name);
2008
2009 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
2010
2011 bh = NULL;
2012 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
2013 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
2014 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
2015
2016 free (tmp_name);
2017
2018 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
2019
2020 return;
2021 }
2022 #endif /* not ARM_WINCE */
2023
2024 /* Select a BFD to be used to hold the sections used by the glue code.
2025 This function is called from the linker scripts in ld/emultempl/
2026 {armcoff/pe}.em */
2027
2028 bfd_boolean
2029 bfd_arm_get_bfd_for_interworking (abfd, info)
2030 bfd * abfd;
2031 struct bfd_link_info * info;
2032 {
2033 struct coff_arm_link_hash_table * globals;
2034 flagword flags;
2035 asection * sec;
2036
2037 /* If we are only performing a partial link do not bother
2038 getting a bfd to hold the glue. */
2039 if (info->relocatable)
2040 return TRUE;
2041
2042 globals = coff_arm_hash_table (info);
2043
2044 BFD_ASSERT (globals != NULL);
2045
2046 if (globals->bfd_of_glue_owner != NULL)
2047 return TRUE;
2048
2049 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2050
2051 if (sec == NULL)
2052 {
2053 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2054
2055 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2056
2057 if (sec == NULL
2058 || ! bfd_set_section_flags (abfd, sec, flags)
2059 || ! bfd_set_section_alignment (abfd, sec, 2))
2060 return FALSE;
2061 }
2062
2063 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2064
2065 if (sec == NULL)
2066 {
2067 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2068
2069 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2070
2071 if (sec == NULL
2072 || ! bfd_set_section_flags (abfd, sec, flags)
2073 || ! bfd_set_section_alignment (abfd, sec, 2))
2074 return FALSE;
2075 }
2076
2077 /* Save the bfd for later use. */
2078 globals->bfd_of_glue_owner = abfd;
2079
2080 return TRUE;
2081 }
2082
2083 bfd_boolean
2084 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2085 bfd * abfd;
2086 struct bfd_link_info * info;
2087 int support_old_code;
2088 {
2089 asection * sec;
2090 struct coff_arm_link_hash_table * globals;
2091
2092 /* If we are only performing a partial link do not bother
2093 to construct any glue. */
2094 if (info->relocatable)
2095 return TRUE;
2096
2097 /* Here we have a bfd that is to be included on the link. We have a hook
2098 to do reloc rummaging, before section sizes are nailed down. */
2099
2100 _bfd_coff_get_external_symbols (abfd);
2101
2102 globals = coff_arm_hash_table (info);
2103
2104 BFD_ASSERT (globals != NULL);
2105 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2106
2107 globals->support_old_code = support_old_code;
2108
2109 /* Rummage around all the relocs and map the glue vectors. */
2110 sec = abfd->sections;
2111
2112 if (sec == NULL)
2113 return TRUE;
2114
2115 for (; sec != NULL; sec = sec->next)
2116 {
2117 struct internal_reloc * i;
2118 struct internal_reloc * rel;
2119
2120 if (sec->reloc_count == 0)
2121 continue;
2122
2123 /* Load the relocs. */
2124 /* FIXME: there may be a storage leak here. */
2125
2126 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2127
2128 BFD_ASSERT (i != 0);
2129
2130 for (rel = i; rel < i + sec->reloc_count; ++rel)
2131 {
2132 unsigned short r_type = rel->r_type;
2133 long symndx;
2134 struct coff_link_hash_entry * h;
2135
2136 symndx = rel->r_symndx;
2137
2138 /* If the relocation is not against a symbol it cannot concern us. */
2139 if (symndx == -1)
2140 continue;
2141
2142 /* If the index is outside of the range of our table, something has gone wrong. */
2143 if (symndx >= obj_conv_table_size (abfd))
2144 {
2145 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2146 bfd_archive_filename (abfd), symndx);
2147 continue;
2148 }
2149
2150 h = obj_coff_sym_hashes (abfd)[symndx];
2151
2152 /* If the relocation is against a static symbol it must be within
2153 the current section and so cannot be a cross ARM/Thumb relocation. */
2154 if (h == NULL)
2155 continue;
2156
2157 switch (r_type)
2158 {
2159 case ARM_26:
2160 /* This one is a call from arm code. We need to look up
2161 the target of the call. If it is a thumb target, we
2162 insert glue. */
2163
2164 if (h->class == C_THUMBEXTFUNC)
2165 record_arm_to_thumb_glue (info, h);
2166 break;
2167
2168 #ifndef ARM_WINCE
2169 case ARM_THUMB23:
2170 /* This one is a call from thumb code. We used to look
2171 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2172 up the target of the call. If it is an arm target, we
2173 insert glue. If the symbol does not exist it will be
2174 given a class of C_EXT and so we will generate a stub
2175 for it. This is not really a problem, since the link
2176 is doomed anyway. */
2177
2178 switch (h->class)
2179 {
2180 case C_EXT:
2181 case C_STAT:
2182 case C_LABEL:
2183 record_thumb_to_arm_glue (info, h);
2184 break;
2185 default:
2186 ;
2187 }
2188 break;
2189 #endif
2190
2191 default:
2192 break;
2193 }
2194 }
2195 }
2196
2197 return TRUE;
2198 }
2199
2200 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2201
2202 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2203 #define coff_relocate_section coff_arm_relocate_section
2204 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2205 #define coff_adjust_symndx coff_arm_adjust_symndx
2206 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2207 #define coff_final_link_postscript coff_arm_final_link_postscript
2208 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2209 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2210 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2211 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2212 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2213
2214 /* When doing a relocatable link, we want to convert ARM_26 relocs
2215 into ARM_26D relocs. */
2216
2217 static bfd_boolean
2218 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2219 bfd *obfd ATTRIBUTE_UNUSED;
2220 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2221 bfd *ibfd;
2222 asection *sec;
2223 struct internal_reloc *irel;
2224 bfd_boolean *adjustedp;
2225 {
2226 if (irel->r_type == ARM_26)
2227 {
2228 struct coff_link_hash_entry *h;
2229
2230 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2231 if (h != NULL
2232 && (h->root.type == bfd_link_hash_defined
2233 || h->root.type == bfd_link_hash_defweak)
2234 && h->root.u.def.section->output_section == sec->output_section)
2235 irel->r_type = ARM_26D;
2236 }
2237 *adjustedp = FALSE;
2238 return TRUE;
2239 }
2240
2241 /* Called when merging the private data areas of two BFDs.
2242 This is important as it allows us to detect if we are
2243 attempting to merge binaries compiled for different ARM
2244 targets, eg different CPUs or different APCS's. */
2245
2246 static bfd_boolean
2247 coff_arm_merge_private_bfd_data (ibfd, obfd)
2248 bfd * ibfd;
2249 bfd * obfd;
2250 {
2251 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2252
2253 if (ibfd == obfd)
2254 return TRUE;
2255
2256 /* If the two formats are different we cannot merge anything.
2257 This is not an error, since it is permissable to change the
2258 input and output formats. */
2259 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2260 || obfd->xvec->flavour != bfd_target_coff_flavour)
2261 return TRUE;
2262
2263 /* Determine what should happen if the input ARM architecture
2264 does not match the output ARM architecture. */
2265 if (! bfd_arm_merge_machines (ibfd, obfd))
2266 return FALSE;
2267
2268 /* Verify that the APCS is the same for the two BFDs. */
2269 if (APCS_SET (ibfd))
2270 {
2271 if (APCS_SET (obfd))
2272 {
2273 /* If the src and dest have different APCS flag bits set, fail. */
2274 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2275 {
2276 _bfd_error_handler
2277 /* xgettext: c-format */
2278 (_("ERROR: %s is compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2279 bfd_archive_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2280 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2281 );
2282
2283 bfd_set_error (bfd_error_wrong_format);
2284 return FALSE;
2285 }
2286
2287 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2288 {
2289 const char *msg;
2290
2291 if (APCS_FLOAT_FLAG (ibfd))
2292 /* xgettext: c-format */
2293 msg = _("ERROR: %s passes floats in float registers, whereas %s passes them in integer registers");
2294 else
2295 /* xgettext: c-format */
2296 msg = _("ERROR: %s passes floats in integer registers, whereas %s passes them in float registers");
2297
2298 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2299 bfd_get_filename (obfd));
2300
2301 bfd_set_error (bfd_error_wrong_format);
2302 return FALSE;
2303 }
2304
2305 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2306 {
2307 const char * msg;
2308
2309 if (PIC_FLAG (ibfd))
2310 /* xgettext: c-format */
2311 msg = _("ERROR: %s is compiled as position independent code, whereas target %s is absolute position");
2312 else
2313 /* xgettext: c-format */
2314 msg = _("ERROR: %s is compiled as absolute position code, whereas target %s is position independent");
2315 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2316 bfd_get_filename (obfd));
2317
2318 bfd_set_error (bfd_error_wrong_format);
2319 return FALSE;
2320 }
2321 }
2322 else
2323 {
2324 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2325
2326 /* Set up the arch and fields as well as these are probably wrong. */
2327 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2328 }
2329 }
2330
2331 /* Check the interworking support. */
2332 if (INTERWORK_SET (ibfd))
2333 {
2334 if (INTERWORK_SET (obfd))
2335 {
2336 /* If the src and dest differ in their interworking issue a warning. */
2337 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2338 {
2339 const char * msg;
2340
2341 if (INTERWORK_FLAG (ibfd))
2342 /* xgettext: c-format */
2343 msg = _("Warning: %s supports interworking, whereas %s does not");
2344 else
2345 /* xgettext: c-format */
2346 msg = _("Warning: %s does not support interworking, whereas %s does");
2347
2348 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2349 bfd_get_filename (obfd));
2350 }
2351 }
2352 else
2353 {
2354 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2355 }
2356 }
2357
2358 return TRUE;
2359 }
2360
2361 /* Display the flags field. */
2362
2363 static bfd_boolean
2364 coff_arm_print_private_bfd_data (abfd, ptr)
2365 bfd * abfd;
2366 PTR ptr;
2367 {
2368 FILE * file = (FILE *) ptr;
2369
2370 BFD_ASSERT (abfd != NULL && ptr != NULL);
2371
2372 /* xgettext:c-format */
2373 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2374
2375 if (APCS_SET (abfd))
2376 {
2377 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2378 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2379
2380 if (APCS_FLOAT_FLAG (abfd))
2381 fprintf (file, _(" [floats passed in float registers]"));
2382 else
2383 fprintf (file, _(" [floats passed in integer registers]"));
2384
2385 if (PIC_FLAG (abfd))
2386 fprintf (file, _(" [position independent]"));
2387 else
2388 fprintf (file, _(" [absolute position]"));
2389 }
2390
2391 if (! INTERWORK_SET (abfd))
2392 fprintf (file, _(" [interworking flag not initialised]"));
2393 else if (INTERWORK_FLAG (abfd))
2394 fprintf (file, _(" [interworking supported]"));
2395 else
2396 fprintf (file, _(" [interworking not supported]"));
2397
2398 fputc ('\n', file);
2399
2400 return TRUE;
2401 }
2402
2403 /* Copies the given flags into the coff_tdata.flags field.
2404 Typically these flags come from the f_flags[] field of
2405 the COFF filehdr structure, which contains important,
2406 target specific information.
2407 Note: Although this function is static, it is explicitly
2408 called from both coffcode.h and peicode.h. */
2409
2410 static bfd_boolean
2411 _bfd_coff_arm_set_private_flags (abfd, flags)
2412 bfd * abfd;
2413 flagword flags;
2414 {
2415 flagword flag;
2416
2417 BFD_ASSERT (abfd != NULL);
2418
2419 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2420
2421 /* Make sure that the APCS field has not been initialised to the opposite
2422 value. */
2423 if (APCS_SET (abfd)
2424 && ( (APCS_26_FLAG (abfd) != flag)
2425 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2426 || (PIC_FLAG (abfd) != (flags & F_PIC))
2427 ))
2428 return FALSE;
2429
2430 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2431
2432 SET_APCS_FLAGS (abfd, flag);
2433
2434 flag = (flags & F_INTERWORK);
2435
2436 /* If the BFD has already had its interworking flag set, but it
2437 is different from the value that we have been asked to set,
2438 then assume that that merged code will not support interworking
2439 and set the flag accordingly. */
2440 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2441 {
2442 if (flag)
2443 /* xgettext: c-format */
2444 _bfd_error_handler (_("Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"),
2445 bfd_archive_filename (abfd));
2446 else
2447 /* xgettext: c-format */
2448 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2449 bfd_archive_filename (abfd));
2450 flag = 0;
2451 }
2452
2453 SET_INTERWORK_FLAG (abfd, flag);
2454
2455 return TRUE;
2456 }
2457
2458 /* Copy the important parts of the target specific data
2459 from one instance of a BFD to another. */
2460
2461 static bfd_boolean
2462 coff_arm_copy_private_bfd_data (src, dest)
2463 bfd * src;
2464 bfd * dest;
2465 {
2466 BFD_ASSERT (src != NULL && dest != NULL);
2467
2468 if (src == dest)
2469 return TRUE;
2470
2471 /* If the destination is not in the same format as the source, do not do
2472 the copy. */
2473 if (src->xvec != dest->xvec)
2474 return TRUE;
2475
2476 /* copy the flags field */
2477 if (APCS_SET (src))
2478 {
2479 if (APCS_SET (dest))
2480 {
2481 /* If the src and dest have different APCS flag bits set, fail. */
2482 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2483 return FALSE;
2484
2485 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2486 return FALSE;
2487
2488 if (PIC_FLAG (dest) != PIC_FLAG (src))
2489 return FALSE;
2490 }
2491 else
2492 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2493 | PIC_FLAG (src));
2494 }
2495
2496 if (INTERWORK_SET (src))
2497 {
2498 if (INTERWORK_SET (dest))
2499 {
2500 /* If the src and dest have different interworking flags then turn
2501 off the interworking bit. */
2502 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2503 {
2504 if (INTERWORK_FLAG (dest))
2505 {
2506 /* xgettext:c-format */
2507 _bfd_error_handler (("\
2508 Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"),
2509 bfd_get_filename (dest),
2510 bfd_archive_filename (src));
2511 }
2512
2513 SET_INTERWORK_FLAG (dest, 0);
2514 }
2515 }
2516 else
2517 {
2518 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2519 }
2520 }
2521
2522 return TRUE;
2523 }
2524
2525 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2526 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2527 #define LOCAL_LABEL_PREFIX ""
2528 #ifndef USER_LABEL_PREFIX
2529 #define USER_LABEL_PREFIX "_"
2530 #endif
2531
2532 /* Like _bfd_coff_is_local_label_name, but
2533 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2534 non-local.
2535 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2536 labels of the form Lxxx to be stripped. */
2537 static bfd_boolean
2538 coff_arm_is_local_label_name (abfd, name)
2539 bfd * abfd ATTRIBUTE_UNUSED;
2540 const char * name;
2541 {
2542 #ifdef USER_LABEL_PREFIX
2543 if (USER_LABEL_PREFIX[0] != 0)
2544 {
2545 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2546 return FALSE;
2547 }
2548 #endif
2549
2550 #ifdef LOCAL_LABEL_PREFIX
2551 /* If there is a prefix for local labels then look for this.
2552 If the prefix exists, but it is empty, then ignore the test. */
2553
2554 if (LOCAL_LABEL_PREFIX[0] != 0)
2555 {
2556 size_t len = strlen (LOCAL_LABEL_PREFIX);
2557
2558 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2559 return FALSE;
2560
2561 /* Perform the checks below for the rest of the name. */
2562 name += len;
2563 }
2564 #endif
2565
2566 return name[0] == 'L';
2567 }
2568
2569 /* This piece of machinery exists only to guarantee that the bfd that holds
2570 the glue section is written last.
2571
2572 This does depend on bfd_make_section attaching a new section to the
2573 end of the section list for the bfd.
2574
2575 krk@cygnus.com */
2576
2577 static bfd_boolean
2578 coff_arm_link_output_has_begun (sub, info)
2579 bfd * sub;
2580 struct coff_final_link_info * info;
2581 {
2582 return (sub->output_has_begun
2583 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2584 }
2585
2586 static bfd_boolean
2587 coff_arm_final_link_postscript (abfd, pfinfo)
2588 bfd * abfd ATTRIBUTE_UNUSED;
2589 struct coff_final_link_info * pfinfo;
2590 {
2591 struct coff_arm_link_hash_table * globals;
2592
2593 globals = coff_arm_hash_table (pfinfo->info);
2594
2595 BFD_ASSERT (globals != NULL);
2596
2597 if (globals->bfd_of_glue_owner != NULL)
2598 {
2599 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2600 return FALSE;
2601
2602 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2603 }
2604
2605 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2606 }
2607
2608 #include "coffcode.h"
2609
2610 #ifndef TARGET_LITTLE_SYM
2611 #define TARGET_LITTLE_SYM armcoff_little_vec
2612 #endif
2613 #ifndef TARGET_LITTLE_NAME
2614 #define TARGET_LITTLE_NAME "coff-arm-little"
2615 #endif
2616 #ifndef TARGET_BIG_SYM
2617 #define TARGET_BIG_SYM armcoff_big_vec
2618 #endif
2619 #ifndef TARGET_BIG_NAME
2620 #define TARGET_BIG_NAME "coff-arm-big"
2621 #endif
2622
2623 #ifndef TARGET_UNDERSCORE
2624 #define TARGET_UNDERSCORE 0
2625 #endif
2626
2627 #ifndef EXTRA_S_FLAGS
2628 #ifdef COFF_WITH_PE
2629 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2630 #else
2631 #define EXTRA_S_FLAGS SEC_CODE
2632 #endif
2633 #endif
2634
2635 /* Forward declaration for use initialising alternative_target field. */
2636 extern const bfd_target TARGET_BIG_SYM ;
2637
2638 /* Target vectors. */
2639 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2640 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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