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* stabs.c (_bfd_link_section_stabs): Use bfd_make_section*_with_flags
[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, 2005, 2006
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26 #include "coff/arm.h"
27 #include "coff/internal.h"
28
29 #ifdef COFF_WITH_PE
30 #include "coff/pe.h"
31 #endif
32
33 #include "libcoff.h"
34
35 /* Macros for manipulation the bits in the flags field of the coff data
36 structure. */
37 #define APCS_26_FLAG(abfd) \
38 (coff_data (abfd)->flags & F_APCS_26)
39
40 #define APCS_FLOAT_FLAG(abfd) \
41 (coff_data (abfd)->flags & F_APCS_FLOAT)
42
43 #define PIC_FLAG(abfd) \
44 (coff_data (abfd)->flags & F_PIC)
45
46 #define APCS_SET(abfd) \
47 (coff_data (abfd)->flags & F_APCS_SET)
48
49 #define SET_APCS_FLAGS(abfd, flgs) \
50 do \
51 { \
52 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
53 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
54 } \
55 while (0)
56
57 #define INTERWORK_FLAG(abfd) \
58 (coff_data (abfd)->flags & F_INTERWORK)
59
60 #define INTERWORK_SET(abfd) \
61 (coff_data (abfd)->flags & F_INTERWORK_SET)
62
63 #define SET_INTERWORK_FLAG(abfd, flg) \
64 do \
65 { \
66 coff_data (abfd)->flags &= ~F_INTERWORK; \
67 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
68 } \
69 while (0)
70
71 #ifndef NUM_ELEM
72 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
73 #endif
74
75 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
76 /* Some typedefs for holding instructions. */
77 typedef unsigned long int insn32;
78 typedef unsigned short int insn16;
79
80 /* The linker script knows the section names for placement.
81 The entry_names are used to do simple name mangling on the stubs.
82 Given a function name, and its type, the stub can be found. The
83 name can be changed. The only requirement is the %s be present. */
84
85 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
86 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
87
88 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
89 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
90
91 /* Used by the assembler. */
92
93 static bfd_reloc_status_type
94 coff_arm_reloc (bfd *abfd,
95 arelent *reloc_entry,
96 asymbol *symbol ATTRIBUTE_UNUSED,
97 void * data,
98 asection *input_section ATTRIBUTE_UNUSED,
99 bfd *output_bfd,
100 char **error_message ATTRIBUTE_UNUSED)
101 {
102 symvalue diff;
103
104 if (output_bfd == NULL)
105 return bfd_reloc_continue;
106
107 diff = reloc_entry->addend;
108
109 #define DOIT(x) \
110 x = ((x & ~howto->dst_mask) \
111 | (((x & howto->src_mask) + diff) & howto->dst_mask))
112
113 if (diff != 0)
114 {
115 reloc_howto_type *howto = reloc_entry->howto;
116 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
117
118 switch (howto->size)
119 {
120 case 0:
121 {
122 char x = bfd_get_8 (abfd, addr);
123 DOIT (x);
124 bfd_put_8 (abfd, x, addr);
125 }
126 break;
127
128 case 1:
129 {
130 short x = bfd_get_16 (abfd, addr);
131 DOIT (x);
132 bfd_put_16 (abfd, (bfd_vma) x, addr);
133 }
134 break;
135
136 case 2:
137 {
138 long x = bfd_get_32 (abfd, addr);
139 DOIT (x);
140 bfd_put_32 (abfd, (bfd_vma) x, addr);
141 }
142 break;
143
144 default:
145 abort ();
146 }
147 }
148
149 /* Now let bfd_perform_relocation finish everything up. */
150 return bfd_reloc_continue;
151 }
152
153 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
154 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
155 should not. */
156 #ifndef TARGET_UNDERSCORE
157 #define TARGET_UNDERSCORE '_'
158 #endif
159
160 #ifndef PCRELOFFSET
161 #define PCRELOFFSET TRUE
162 #endif
163
164 /* These most certainly belong somewhere else. Just had to get rid of
165 the manifest constants in the code. */
166 #define ARM_8 0
167 #define ARM_16 1
168 #define ARM_32 2
169 #define ARM_26 3
170 #define ARM_DISP8 4
171 #define ARM_DISP16 5
172 #define ARM_DISP32 6
173 #define ARM_26D 7
174 /* 8 is unused. */
175 #define ARM_NEG16 9
176 #define ARM_NEG32 10
177 #define ARM_RVA32 11
178 #define ARM_THUMB9 12
179 #define ARM_THUMB12 13
180 #define ARM_THUMB23 14
181
182 #ifdef ARM_WINCE
183 #undef ARM_32
184 #undef ARM_RVA32
185 #undef ARM_26
186 #undef ARM_THUMB12
187 #undef ARM_26D
188
189 #define ARM_26D 0
190 #define ARM_32 1
191 #define ARM_RVA32 2
192 #define ARM_26 3
193 #define ARM_THUMB12 4
194 #define ARM_SECTION 14
195 #define ARM_SECREL 15
196 #endif
197
198 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
199 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
200 static bfd_reloc_status_type aoutarm_fix_pcrel_26
201 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
202 static bfd_reloc_status_type coff_thumb_pcrel_12
203 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
204 #ifndef ARM_WINCE
205 static bfd_reloc_status_type coff_thumb_pcrel_9
206 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
207 static bfd_reloc_status_type coff_thumb_pcrel_23
208 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
209 #endif
210
211 static reloc_howto_type aoutarm_std_reloc_howto[] =
212 {
213 #ifdef ARM_WINCE
214 HOWTO (ARM_26D,
215 2,
216 2,
217 24,
218 TRUE,
219 0,
220 complain_overflow_dont,
221 aoutarm_fix_pcrel_26_done,
222 "ARM_26D",
223 TRUE, /* partial_inplace. */
224 0x00ffffff,
225 0x0,
226 PCRELOFFSET),
227 HOWTO (ARM_32,
228 0,
229 2,
230 32,
231 FALSE,
232 0,
233 complain_overflow_bitfield,
234 coff_arm_reloc,
235 "ARM_32",
236 TRUE, /* partial_inplace. */
237 0xffffffff,
238 0xffffffff,
239 PCRELOFFSET),
240 HOWTO (ARM_RVA32,
241 0,
242 2,
243 32,
244 FALSE,
245 0,
246 complain_overflow_bitfield,
247 coff_arm_reloc,
248 "ARM_RVA32",
249 TRUE, /* partial_inplace. */
250 0xffffffff,
251 0xffffffff,
252 PCRELOFFSET),
253 HOWTO (ARM_26,
254 2,
255 2,
256 24,
257 TRUE,
258 0,
259 complain_overflow_signed,
260 aoutarm_fix_pcrel_26 ,
261 "ARM_26",
262 FALSE,
263 0x00ffffff,
264 0x00ffffff,
265 PCRELOFFSET),
266 HOWTO (ARM_THUMB12,
267 1,
268 1,
269 11,
270 TRUE,
271 0,
272 complain_overflow_signed,
273 coff_thumb_pcrel_12 ,
274 "ARM_THUMB12",
275 FALSE,
276 0x000007ff,
277 0x000007ff,
278 PCRELOFFSET),
279 EMPTY_HOWTO (-1),
280 EMPTY_HOWTO (-1),
281 EMPTY_HOWTO (-1),
282 EMPTY_HOWTO (-1),
283 EMPTY_HOWTO (-1),
284 EMPTY_HOWTO (-1),
285 EMPTY_HOWTO (-1),
286 EMPTY_HOWTO (-1),
287 EMPTY_HOWTO (-1),
288 HOWTO (ARM_SECTION,
289 0,
290 1,
291 16,
292 FALSE,
293 0,
294 complain_overflow_bitfield,
295 coff_arm_reloc,
296 "ARM_SECTION",
297 TRUE, /* partial_inplace. */
298 0x0000ffff,
299 0x0000ffff,
300 PCRELOFFSET),
301 HOWTO (ARM_SECREL,
302 0,
303 2,
304 32,
305 FALSE,
306 0,
307 complain_overflow_bitfield,
308 coff_arm_reloc,
309 "ARM_SECREL",
310 TRUE, /* partial_inplace. */
311 0xffffffff,
312 0xffffffff,
313 PCRELOFFSET),
314 #else /* not ARM_WINCE */
315 HOWTO (ARM_8,
316 0,
317 0,
318 8,
319 FALSE,
320 0,
321 complain_overflow_bitfield,
322 coff_arm_reloc,
323 "ARM_8",
324 TRUE,
325 0x000000ff,
326 0x000000ff,
327 PCRELOFFSET),
328 HOWTO (ARM_16,
329 0,
330 1,
331 16,
332 FALSE,
333 0,
334 complain_overflow_bitfield,
335 coff_arm_reloc,
336 "ARM_16",
337 TRUE,
338 0x0000ffff,
339 0x0000ffff,
340 PCRELOFFSET),
341 HOWTO (ARM_32,
342 0,
343 2,
344 32,
345 FALSE,
346 0,
347 complain_overflow_bitfield,
348 coff_arm_reloc,
349 "ARM_32",
350 TRUE,
351 0xffffffff,
352 0xffffffff,
353 PCRELOFFSET),
354 HOWTO (ARM_26,
355 2,
356 2,
357 24,
358 TRUE,
359 0,
360 complain_overflow_signed,
361 aoutarm_fix_pcrel_26 ,
362 "ARM_26",
363 FALSE,
364 0x00ffffff,
365 0x00ffffff,
366 PCRELOFFSET),
367 HOWTO (ARM_DISP8,
368 0,
369 0,
370 8,
371 TRUE,
372 0,
373 complain_overflow_signed,
374 coff_arm_reloc,
375 "ARM_DISP8",
376 TRUE,
377 0x000000ff,
378 0x000000ff,
379 TRUE),
380 HOWTO (ARM_DISP16,
381 0,
382 1,
383 16,
384 TRUE,
385 0,
386 complain_overflow_signed,
387 coff_arm_reloc,
388 "ARM_DISP16",
389 TRUE,
390 0x0000ffff,
391 0x0000ffff,
392 TRUE),
393 HOWTO (ARM_DISP32,
394 0,
395 2,
396 32,
397 TRUE,
398 0,
399 complain_overflow_signed,
400 coff_arm_reloc,
401 "ARM_DISP32",
402 TRUE,
403 0xffffffff,
404 0xffffffff,
405 TRUE),
406 HOWTO (ARM_26D,
407 2,
408 2,
409 24,
410 FALSE,
411 0,
412 complain_overflow_dont,
413 aoutarm_fix_pcrel_26_done,
414 "ARM_26D",
415 TRUE,
416 0x00ffffff,
417 0x0,
418 FALSE),
419 /* 8 is unused */
420 EMPTY_HOWTO (-1),
421 HOWTO (ARM_NEG16,
422 0,
423 -1,
424 16,
425 FALSE,
426 0,
427 complain_overflow_bitfield,
428 coff_arm_reloc,
429 "ARM_NEG16",
430 TRUE,
431 0x0000ffff,
432 0x0000ffff,
433 FALSE),
434 HOWTO (ARM_NEG32,
435 0,
436 -2,
437 32,
438 FALSE,
439 0,
440 complain_overflow_bitfield,
441 coff_arm_reloc,
442 "ARM_NEG32",
443 TRUE,
444 0xffffffff,
445 0xffffffff,
446 FALSE),
447 HOWTO (ARM_RVA32,
448 0,
449 2,
450 32,
451 FALSE,
452 0,
453 complain_overflow_bitfield,
454 coff_arm_reloc,
455 "ARM_RVA32",
456 TRUE,
457 0xffffffff,
458 0xffffffff,
459 PCRELOFFSET),
460 HOWTO (ARM_THUMB9,
461 1,
462 1,
463 8,
464 TRUE,
465 0,
466 complain_overflow_signed,
467 coff_thumb_pcrel_9 ,
468 "ARM_THUMB9",
469 FALSE,
470 0x000000ff,
471 0x000000ff,
472 PCRELOFFSET),
473 HOWTO (ARM_THUMB12,
474 1,
475 1,
476 11,
477 TRUE,
478 0,
479 complain_overflow_signed,
480 coff_thumb_pcrel_12 ,
481 "ARM_THUMB12",
482 FALSE,
483 0x000007ff,
484 0x000007ff,
485 PCRELOFFSET),
486 HOWTO (ARM_THUMB23,
487 1,
488 2,
489 22,
490 TRUE,
491 0,
492 complain_overflow_signed,
493 coff_thumb_pcrel_23 ,
494 "ARM_THUMB23",
495 FALSE,
496 0x07ff07ff,
497 0x07ff07ff,
498 PCRELOFFSET)
499 #endif /* not ARM_WINCE */
500 };
501
502 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
503
504 #ifdef COFF_WITH_PE
505 /* Return TRUE if this relocation should
506 appear in the output .reloc section. */
507
508 static bfd_boolean
509 in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED,
510 reloc_howto_type * howto)
511 {
512 return !howto->pc_relative && howto->type != ARM_RVA32;
513 }
514 #endif
515
516 #define RTYPE2HOWTO(cache_ptr, dst) \
517 (cache_ptr)->howto = \
518 (dst)->r_type < NUM_RELOCS \
519 ? aoutarm_std_reloc_howto + (dst)->r_type \
520 : NULL
521
522 #define coff_rtype_to_howto coff_arm_rtype_to_howto
523
524 static reloc_howto_type *
525 coff_arm_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
526 asection *sec,
527 struct internal_reloc *rel,
528 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED,
529 struct internal_syment *sym ATTRIBUTE_UNUSED,
530 bfd_vma *addendp)
531 {
532 reloc_howto_type * howto;
533
534 if (rel->r_type >= NUM_RELOCS)
535 return NULL;
536
537 howto = aoutarm_std_reloc_howto + rel->r_type;
538
539 if (rel->r_type == ARM_RVA32)
540 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
541
542 return howto;
543 }
544
545 /* Used by the assembler. */
546
547 static bfd_reloc_status_type
548 aoutarm_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED,
549 arelent *reloc_entry ATTRIBUTE_UNUSED,
550 asymbol *symbol ATTRIBUTE_UNUSED,
551 void * data ATTRIBUTE_UNUSED,
552 asection *input_section ATTRIBUTE_UNUSED,
553 bfd *output_bfd ATTRIBUTE_UNUSED,
554 char **error_message ATTRIBUTE_UNUSED)
555 {
556 /* This is dead simple at present. */
557 return bfd_reloc_ok;
558 }
559
560 /* Used by the assembler. */
561
562 static bfd_reloc_status_type
563 aoutarm_fix_pcrel_26 (bfd *abfd,
564 arelent *reloc_entry,
565 asymbol *symbol,
566 void * data,
567 asection *input_section,
568 bfd *output_bfd,
569 char **error_message ATTRIBUTE_UNUSED)
570 {
571 bfd_vma relocation;
572 bfd_size_type addr = reloc_entry->address;
573 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
574 bfd_reloc_status_type flag = bfd_reloc_ok;
575
576 /* If this is an undefined symbol, return error. */
577 if (symbol->section == &bfd_und_section
578 && (symbol->flags & BSF_WEAK) == 0)
579 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
580
581 /* If the sections are different, and we are doing a partial relocation,
582 just ignore it for now. */
583 if (symbol->section->name != input_section->name
584 && output_bfd != (bfd *)NULL)
585 return bfd_reloc_continue;
586
587 relocation = (target & 0x00ffffff) << 2;
588 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
589 relocation += symbol->value;
590 relocation += symbol->section->output_section->vma;
591 relocation += symbol->section->output_offset;
592 relocation += reloc_entry->addend;
593 relocation -= input_section->output_section->vma;
594 relocation -= input_section->output_offset;
595 relocation -= addr;
596
597 if (relocation & 3)
598 return bfd_reloc_overflow;
599
600 /* Check for overflow. */
601 if (relocation & 0x02000000)
602 {
603 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
604 flag = bfd_reloc_overflow;
605 }
606 else if (relocation & ~(bfd_vma) 0x03ffffff)
607 flag = bfd_reloc_overflow;
608
609 target &= ~0x00ffffff;
610 target |= (relocation >> 2) & 0x00ffffff;
611 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
612
613 /* Now the ARM magic... Change the reloc type so that it is marked as done.
614 Strictly this is only necessary if we are doing a partial relocation. */
615 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
616
617 return flag;
618 }
619
620 static bfd_reloc_status_type
621 coff_thumb_pcrel_common (bfd *abfd,
622 arelent *reloc_entry,
623 asymbol *symbol,
624 void * data,
625 asection *input_section,
626 bfd *output_bfd,
627 char **error_message ATTRIBUTE_UNUSED,
628 thumb_pcrel_branchtype btype)
629 {
630 bfd_vma relocation = 0;
631 bfd_size_type addr = reloc_entry->address;
632 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
633 bfd_reloc_status_type flag = bfd_reloc_ok;
634 bfd_vma dstmsk;
635 bfd_vma offmsk;
636 bfd_vma signbit;
637
638 /* NOTE: This routine is currently used by GAS, but not by the link
639 phase. */
640 switch (btype)
641 {
642 case b9:
643 dstmsk = 0x000000ff;
644 offmsk = 0x000001fe;
645 signbit = 0x00000100;
646 break;
647
648 case b12:
649 dstmsk = 0x000007ff;
650 offmsk = 0x00000ffe;
651 signbit = 0x00000800;
652 break;
653
654 case b23:
655 dstmsk = 0x07ff07ff;
656 offmsk = 0x007fffff;
657 signbit = 0x00400000;
658 break;
659
660 default:
661 abort ();
662 }
663
664 /* If this is an undefined symbol, return error. */
665 if (symbol->section == &bfd_und_section
666 && (symbol->flags & BSF_WEAK) == 0)
667 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
668
669 /* If the sections are different, and we are doing a partial relocation,
670 just ignore it for now. */
671 if (symbol->section->name != input_section->name
672 && output_bfd != (bfd *)NULL)
673 return bfd_reloc_continue;
674
675 switch (btype)
676 {
677 case b9:
678 case b12:
679 relocation = ((target & dstmsk) << 1);
680 break;
681
682 case b23:
683 if (bfd_big_endian (abfd))
684 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
685 else
686 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
687 break;
688
689 default:
690 abort ();
691 }
692
693 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
694 relocation += symbol->value;
695 relocation += symbol->section->output_section->vma;
696 relocation += symbol->section->output_offset;
697 relocation += reloc_entry->addend;
698 relocation -= input_section->output_section->vma;
699 relocation -= input_section->output_offset;
700 relocation -= addr;
701
702 if (relocation & 1)
703 return bfd_reloc_overflow;
704
705 /* Check for overflow. */
706 if (relocation & signbit)
707 {
708 if ((relocation & ~offmsk) != ~offmsk)
709 flag = bfd_reloc_overflow;
710 }
711 else if (relocation & ~offmsk)
712 flag = bfd_reloc_overflow;
713
714 target &= ~dstmsk;
715 switch (btype)
716 {
717 case b9:
718 case b12:
719 target |= (relocation >> 1);
720 break;
721
722 case b23:
723 if (bfd_big_endian (abfd))
724 target |= (((relocation & 0xfff) >> 1)
725 | ((relocation << 4) & 0x07ff0000));
726 else
727 target |= (((relocation & 0xffe) << 15)
728 | ((relocation >> 12) & 0x7ff));
729 break;
730
731 default:
732 abort ();
733 }
734
735 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
736
737 /* Now the ARM magic... Change the reloc type so that it is marked as done.
738 Strictly this is only necessary if we are doing a partial relocation. */
739 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
740
741 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
742 return flag;
743 }
744
745 #ifndef ARM_WINCE
746 static bfd_reloc_status_type
747 coff_thumb_pcrel_23 (bfd *abfd,
748 arelent *reloc_entry,
749 asymbol *symbol,
750 void * data,
751 asection *input_section,
752 bfd *output_bfd,
753 char **error_message)
754 {
755 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
756 input_section, output_bfd, error_message,
757 b23);
758 }
759
760 static bfd_reloc_status_type
761 coff_thumb_pcrel_9 (bfd *abfd,
762 arelent *reloc_entry,
763 asymbol *symbol,
764 void * data,
765 asection *input_section,
766 bfd *output_bfd,
767 char **error_message)
768 {
769 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
770 input_section, output_bfd, error_message,
771 b9);
772 }
773 #endif /* not ARM_WINCE */
774
775 static bfd_reloc_status_type
776 coff_thumb_pcrel_12 (bfd *abfd,
777 arelent *reloc_entry,
778 asymbol *symbol,
779 void * data,
780 asection *input_section,
781 bfd *output_bfd,
782 char **error_message)
783 {
784 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
785 input_section, output_bfd, error_message,
786 b12);
787 }
788
789 static const struct reloc_howto_struct *
790 coff_arm_reloc_type_lookup (bfd * abfd, bfd_reloc_code_real_type code)
791 {
792 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
793
794 if (code == BFD_RELOC_CTOR)
795 switch (bfd_get_arch_info (abfd)->bits_per_address)
796 {
797 case 32:
798 code = BFD_RELOC_32;
799 break;
800 default:
801 return NULL;
802 }
803
804 switch (code)
805 {
806 #ifdef ARM_WINCE
807 ASTD (BFD_RELOC_32, ARM_32);
808 ASTD (BFD_RELOC_RVA, ARM_RVA32);
809 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
810 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
811 #else
812 ASTD (BFD_RELOC_8, ARM_8);
813 ASTD (BFD_RELOC_16, ARM_16);
814 ASTD (BFD_RELOC_32, ARM_32);
815 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
816 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
817 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
818 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
819 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
820 ASTD (BFD_RELOC_RVA, ARM_RVA32);
821 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
822 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
823 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
824 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
825 #endif
826 default: return NULL;
827 }
828 }
829
830 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
831 #define COFF_PAGE_SIZE 0x1000
832
833 /* Turn a howto into a reloc nunmber. */
834 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
835 #define BADMAG(x) ARMBADMAG(x)
836 #define ARM 1 /* Customize coffcode.h. */
837
838 #ifndef ARM_WINCE
839 /* Make sure that the 'r_offset' field is copied properly
840 so that identical binaries will compare the same. */
841 #define SWAP_IN_RELOC_OFFSET H_GET_32
842 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
843 #endif
844
845 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
846 This allows us to store global data here without actually creating any
847 global variables, which is a no-no in the BFD world. */
848 struct coff_arm_link_hash_table
849 {
850 /* The original coff_link_hash_table structure. MUST be first field. */
851 struct coff_link_hash_table root;
852
853 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
854 bfd_size_type thumb_glue_size;
855
856 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
857 bfd_size_type arm_glue_size;
858
859 /* An arbitrary input BFD chosen to hold the glue sections. */
860 bfd * bfd_of_glue_owner;
861
862 /* Support interworking with old, non-interworking aware ARM code. */
863 int support_old_code;
864 };
865
866 /* Get the ARM coff linker hash table from a link_info structure. */
867 #define coff_arm_hash_table(info) \
868 ((struct coff_arm_link_hash_table *) ((info)->hash))
869
870 /* Create an ARM coff linker hash table. */
871
872 static struct bfd_link_hash_table *
873 coff_arm_link_hash_table_create (bfd * abfd)
874 {
875 struct coff_arm_link_hash_table * ret;
876 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
877
878 ret = bfd_malloc (amt);
879 if (ret == NULL)
880 return NULL;
881
882 if (!_bfd_coff_link_hash_table_init (&ret->root,
883 abfd,
884 _bfd_coff_link_hash_newfunc,
885 sizeof (struct coff_link_hash_entry)))
886 {
887 free (ret);
888 return NULL;
889 }
890
891 ret->thumb_glue_size = 0;
892 ret->arm_glue_size = 0;
893 ret->bfd_of_glue_owner = NULL;
894
895 return & ret->root.root;
896 }
897
898 static void
899 arm_emit_base_file_entry (struct bfd_link_info *info,
900 bfd *output_bfd,
901 asection *input_section,
902 bfd_vma reloc_offset)
903 {
904 bfd_vma addr = reloc_offset
905 - input_section->vma
906 + input_section->output_offset
907 + input_section->output_section->vma;
908
909 if (coff_data (output_bfd)->pe)
910 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
911 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
912
913 }
914 \f
915 #ifndef ARM_WINCE
916 /* The thumb form of a long branch is a bit finicky, because the offset
917 encoding is split over two fields, each in it's own instruction. They
918 can occur in any order. So given a thumb form of long branch, and an
919 offset, insert the offset into the thumb branch and return finished
920 instruction.
921
922 It takes two thumb instructions to encode the target address. Each has
923 11 bits to invest. The upper 11 bits are stored in one (identified by
924 H-0.. see below), the lower 11 bits are stored in the other (identified
925 by H-1).
926
927 Combine together and shifted left by 1 (it's a half word address) and
928 there you have it.
929
930 Op: 1111 = F,
931 H-0, upper address-0 = 000
932 Op: 1111 = F,
933 H-1, lower address-0 = 800
934
935 They can be ordered either way, but the arm tools I've seen always put
936 the lower one first. It probably doesn't matter. krk@cygnus.com
937
938 XXX: Actually the order does matter. The second instruction (H-1)
939 moves the computed address into the PC, so it must be the second one
940 in the sequence. The problem, however is that whilst little endian code
941 stores the instructions in HI then LOW order, big endian code does the
942 reverse. nickc@cygnus.com. */
943
944 #define LOW_HI_ORDER 0xF800F000
945 #define HI_LOW_ORDER 0xF000F800
946
947 static insn32
948 insert_thumb_branch (insn32 br_insn, int rel_off)
949 {
950 unsigned int low_bits;
951 unsigned int high_bits;
952
953 BFD_ASSERT ((rel_off & 1) != 1);
954
955 rel_off >>= 1; /* Half word aligned address. */
956 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
957 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
958
959 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
960 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
961 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
962 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
963 else
964 /* FIXME: the BFD library should never abort except for internal errors
965 - it should return an error status. */
966 abort (); /* Error - not a valid branch instruction form. */
967
968 return br_insn;
969 }
970
971 \f
972 static struct coff_link_hash_entry *
973 find_thumb_glue (struct bfd_link_info *info,
974 const char *name,
975 bfd *input_bfd)
976 {
977 char *tmp_name;
978 struct coff_link_hash_entry *myh;
979 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
980
981 tmp_name = bfd_malloc (amt);
982
983 BFD_ASSERT (tmp_name);
984
985 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
986
987 myh = coff_link_hash_lookup
988 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
989
990 if (myh == NULL)
991 /* xgettext:c-format */
992 _bfd_error_handler (_("%B: unable to find THUMB glue '%s' for `%s'"),
993 input_bfd, tmp_name, name);
994
995 free (tmp_name);
996
997 return myh;
998 }
999 #endif /* not ARM_WINCE */
1000
1001 static struct coff_link_hash_entry *
1002 find_arm_glue (struct bfd_link_info *info,
1003 const char *name,
1004 bfd *input_bfd)
1005 {
1006 char *tmp_name;
1007 struct coff_link_hash_entry * myh;
1008 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1009
1010 tmp_name = bfd_malloc (amt);
1011
1012 BFD_ASSERT (tmp_name);
1013
1014 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1015
1016 myh = coff_link_hash_lookup
1017 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1018
1019 if (myh == NULL)
1020 /* xgettext:c-format */
1021 _bfd_error_handler (_("%B: unable to find ARM glue '%s' for `%s'"),
1022 input_bfd, tmp_name, name);
1023
1024 free (tmp_name);
1025
1026 return myh;
1027 }
1028
1029 /*
1030 ARM->Thumb glue:
1031
1032 .arm
1033 __func_from_arm:
1034 ldr r12, __func_addr
1035 bx r12
1036 __func_addr:
1037 .word func @ behave as if you saw a ARM_32 reloc
1038 */
1039
1040 #define ARM2THUMB_GLUE_SIZE 12
1041 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1042 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1043 static const insn32 a2t3_func_addr_insn = 0x00000001;
1044
1045 /*
1046 Thumb->ARM: Thumb->(non-interworking aware) ARM
1047
1048 .thumb .thumb
1049 .align 2 .align 2
1050 __func_from_thumb: __func_from_thumb:
1051 bx pc push {r6, lr}
1052 nop ldr r6, __func_addr
1053 .arm mov lr, pc
1054 __func_change_to_arm: bx r6
1055 b func .arm
1056 __func_back_to_thumb:
1057 ldmia r13! {r6, lr}
1058 bx lr
1059 __func_addr:
1060 .word func
1061 */
1062
1063 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1064 #ifndef ARM_WINCE
1065 static const insn16 t2a1_bx_pc_insn = 0x4778;
1066 static const insn16 t2a2_noop_insn = 0x46c0;
1067 static const insn32 t2a3_b_insn = 0xea000000;
1068
1069 static const insn16 t2a1_push_insn = 0xb540;
1070 static const insn16 t2a2_ldr_insn = 0x4e03;
1071 static const insn16 t2a3_mov_insn = 0x46fe;
1072 static const insn16 t2a4_bx_insn = 0x4730;
1073 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1074 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1075 #endif
1076
1077 /* TODO:
1078 We should really create new local (static) symbols in destination
1079 object for each stub we create. We should also create local
1080 (static) symbols within the stubs when switching between ARM and
1081 Thumb code. This will ensure that the debugger and disassembler
1082 can present a better view of stubs.
1083
1084 We can treat stubs like literal sections, and for the THUMB9 ones
1085 (short addressing range) we should be able to insert the stubs
1086 between sections. i.e. the simplest approach (since relocations
1087 are done on a section basis) is to dump the stubs at the end of
1088 processing a section. That way we can always try and minimise the
1089 offset to and from a stub. However, this does not map well onto
1090 the way that the linker/BFD does its work: mapping all input
1091 sections to output sections via the linker script before doing
1092 all the processing.
1093
1094 Unfortunately it may be easier to just to disallow short range
1095 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1096 only branch-and-link (BL) calls. This will simplify the processing
1097 since we can then put all of the stubs into their own section.
1098
1099 TODO:
1100 On a different subject, rather than complaining when a
1101 branch cannot fit in the number of bits available for the
1102 instruction we should generate a trampoline stub (needed to
1103 address the complete 32bit address space). */
1104
1105 /* The standard COFF backend linker does not cope with the special
1106 Thumb BRANCH23 relocation. The alternative would be to split the
1107 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1108 bit simpler simply providing our own relocation driver. */
1109
1110 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1111 This code is a very slightly modified copy of
1112 _bfd_coff_generic_relocate_section. It would be a much more
1113 maintainable solution to have a MACRO that could be expanded within
1114 _bfd_coff_generic_relocate_section that would only be provided for
1115 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1116 is different from the original. */
1117
1118 static bfd_boolean
1119 coff_arm_relocate_section (bfd *output_bfd,
1120 struct bfd_link_info *info,
1121 bfd *input_bfd,
1122 asection *input_section,
1123 bfd_byte *contents,
1124 struct internal_reloc *relocs,
1125 struct internal_syment *syms,
1126 asection **sections)
1127 {
1128 struct internal_reloc * rel;
1129 struct internal_reloc * relend;
1130 #ifndef ARM_WINCE
1131 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1132 #endif
1133
1134 rel = relocs;
1135 relend = rel + input_section->reloc_count;
1136
1137 for (; rel < relend; rel++)
1138 {
1139 int done = 0;
1140 long symndx;
1141 struct coff_link_hash_entry * h;
1142 struct internal_syment * sym;
1143 bfd_vma addend;
1144 bfd_vma val;
1145 reloc_howto_type * howto;
1146 bfd_reloc_status_type rstat;
1147 bfd_vma h_val;
1148
1149 symndx = rel->r_symndx;
1150
1151 if (symndx == -1)
1152 {
1153 h = NULL;
1154 sym = NULL;
1155 }
1156 else
1157 {
1158 h = obj_coff_sym_hashes (input_bfd)[symndx];
1159 sym = syms + symndx;
1160 }
1161
1162 /* COFF treats common symbols in one of two ways. Either the
1163 size of the symbol is included in the section contents, or it
1164 is not. We assume that the size is not included, and force
1165 the rtype_to_howto function to adjust the addend as needed. */
1166
1167 if (sym != NULL && sym->n_scnum != 0)
1168 addend = - sym->n_value;
1169 else
1170 addend = 0;
1171
1172 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1173 sym, &addend);
1174 if (howto == NULL)
1175 return FALSE;
1176
1177 /* The relocation_section function will skip pcrel_offset relocs
1178 when doing a relocatable link. However, we want to convert
1179 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1180 this case without pcrel_offset set, and adjust the addend to
1181 compensate. 'partial_inplace' is also set, since we want 'done'
1182 relocations to be reflected in section's data. */
1183 if (rel->r_type == ARM_26
1184 && h != NULL
1185 && info->relocatable
1186 && (h->root.type == bfd_link_hash_defined
1187 || h->root.type == bfd_link_hash_defweak)
1188 && (h->root.u.def.section->output_section
1189 == input_section->output_section))
1190 {
1191 static reloc_howto_type fake_arm26_reloc =
1192 HOWTO (ARM_26,
1193 2,
1194 2,
1195 24,
1196 TRUE,
1197 0,
1198 complain_overflow_signed,
1199 aoutarm_fix_pcrel_26 ,
1200 "ARM_26",
1201 TRUE,
1202 0x00ffffff,
1203 0x00ffffff,
1204 FALSE);
1205
1206 addend -= rel->r_vaddr - input_section->vma;
1207 #ifdef ARM_WINCE
1208 /* FIXME: I don't know why, but the hack is necessary for correct
1209 generation of bl's instruction offset. */
1210 addend -= 8;
1211 #endif
1212 howto = & fake_arm26_reloc;
1213 }
1214
1215 #ifdef ARM_WINCE
1216 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1217 the next opcode's pc, so is off by one. */
1218 if (howto->pc_relative && !info->relocatable)
1219 addend -= 8;
1220 #endif
1221
1222 /* If we are doing a relocatable link, then we can just ignore
1223 a PC relative reloc that is pcrel_offset. It will already
1224 have the correct value. If this is not a relocatable link,
1225 then we should ignore the symbol value. */
1226 if (howto->pc_relative && howto->pcrel_offset)
1227 {
1228 if (info->relocatable)
1229 continue;
1230 /* FIXME - it is not clear which targets need this next test
1231 and which do not. It is known that it is needed for the
1232 VxWorks and EPOC-PE targets, but it is also known that it
1233 was suppressed for other ARM targets. This ought to be
1234 sorted out one day. */
1235 #ifdef ARM_COFF_BUGFIX
1236 /* We must not ignore the symbol value. If the symbol is
1237 within the same section, the relocation should have already
1238 been fixed, but if it is not, we'll be handed a reloc into
1239 the beginning of the symbol's section, so we must not cancel
1240 out the symbol's value, otherwise we'll be adding it in
1241 twice. */
1242 if (sym != NULL && sym->n_scnum != 0)
1243 addend += sym->n_value;
1244 #endif
1245 }
1246
1247 val = 0;
1248
1249 if (h == NULL)
1250 {
1251 asection *sec;
1252
1253 if (symndx == -1)
1254 {
1255 sec = bfd_abs_section_ptr;
1256 val = 0;
1257 }
1258 else
1259 {
1260 sec = sections[symndx];
1261 val = (sec->output_section->vma
1262 + sec->output_offset
1263 + sym->n_value
1264 - sec->vma);
1265 }
1266 }
1267 else
1268 {
1269 /* We don't output the stubs if we are generating a
1270 relocatable output file, since we may as well leave the
1271 stub generation to the final linker pass. If we fail to
1272 verify that the name is defined, we'll try to build stubs
1273 for an undefined name... */
1274 if (! info->relocatable
1275 && ( h->root.type == bfd_link_hash_defined
1276 || h->root.type == bfd_link_hash_defweak))
1277 {
1278 asection * h_sec = h->root.u.def.section;
1279 const char * name = h->root.root.string;
1280
1281 /* h locates the symbol referenced in the reloc. */
1282 h_val = (h->root.u.def.value
1283 + h_sec->output_section->vma
1284 + h_sec->output_offset);
1285
1286 if (howto->type == ARM_26)
1287 {
1288 if ( h->class == C_THUMBSTATFUNC
1289 || h->class == C_THUMBEXTFUNC)
1290 {
1291 /* Arm code calling a Thumb function. */
1292 unsigned long int tmp;
1293 bfd_vma my_offset;
1294 asection * s;
1295 long int ret_offset;
1296 struct coff_link_hash_entry * myh;
1297 struct coff_arm_link_hash_table * globals;
1298
1299 myh = find_arm_glue (info, name, input_bfd);
1300 if (myh == NULL)
1301 return FALSE;
1302
1303 globals = coff_arm_hash_table (info);
1304
1305 BFD_ASSERT (globals != NULL);
1306 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1307
1308 my_offset = myh->root.u.def.value;
1309
1310 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1311 ARM2THUMB_GLUE_SECTION_NAME);
1312 BFD_ASSERT (s != NULL);
1313 BFD_ASSERT (s->contents != NULL);
1314 BFD_ASSERT (s->output_section != NULL);
1315
1316 if ((my_offset & 0x01) == 0x01)
1317 {
1318 if (h_sec->owner != NULL
1319 && INTERWORK_SET (h_sec->owner)
1320 && ! INTERWORK_FLAG (h_sec->owner))
1321 _bfd_error_handler
1322 /* xgettext:c-format */
1323 (_("%B(%s): warning: interworking not enabled.\n"
1324 " first occurrence: %B: arm call to thumb"),
1325 h_sec->owner, input_bfd, name);
1326
1327 --my_offset;
1328 myh->root.u.def.value = my_offset;
1329
1330 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1331 s->contents + my_offset);
1332
1333 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1334 s->contents + my_offset + 4);
1335
1336 /* It's a thumb address. Add the low order bit. */
1337 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1338 s->contents + my_offset + 8);
1339
1340 if (info->base_file)
1341 arm_emit_base_file_entry (info, output_bfd, s,
1342 my_offset + 8);
1343
1344 }
1345
1346 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1347
1348 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1349 - input_section->vma);
1350
1351 tmp = tmp & 0xFF000000;
1352
1353 /* Somehow these are both 4 too far, so subtract 8. */
1354 ret_offset =
1355 s->output_offset
1356 + my_offset
1357 + s->output_section->vma
1358 - (input_section->output_offset
1359 + input_section->output_section->vma
1360 + rel->r_vaddr)
1361 - 8;
1362
1363 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1364
1365 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1366 contents + rel->r_vaddr - input_section->vma);
1367 done = 1;
1368 }
1369 }
1370
1371 #ifndef ARM_WINCE
1372 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1373 else if (howto->type == ARM_THUMB23)
1374 {
1375 if ( h->class == C_EXT
1376 || h->class == C_STAT
1377 || h->class == C_LABEL)
1378 {
1379 /* Thumb code calling an ARM function. */
1380 asection * s = 0;
1381 bfd_vma my_offset;
1382 unsigned long int tmp;
1383 long int ret_offset;
1384 struct coff_link_hash_entry * myh;
1385 struct coff_arm_link_hash_table * globals;
1386
1387 myh = find_thumb_glue (info, name, input_bfd);
1388 if (myh == NULL)
1389 return FALSE;
1390
1391 globals = coff_arm_hash_table (info);
1392
1393 BFD_ASSERT (globals != NULL);
1394 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1395
1396 my_offset = myh->root.u.def.value;
1397
1398 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1399 THUMB2ARM_GLUE_SECTION_NAME);
1400
1401 BFD_ASSERT (s != NULL);
1402 BFD_ASSERT (s->contents != NULL);
1403 BFD_ASSERT (s->output_section != NULL);
1404
1405 if ((my_offset & 0x01) == 0x01)
1406 {
1407 if (h_sec->owner != NULL
1408 && INTERWORK_SET (h_sec->owner)
1409 && ! INTERWORK_FLAG (h_sec->owner)
1410 && ! globals->support_old_code)
1411 _bfd_error_handler
1412 /* xgettext:c-format */
1413 (_("%B(%s): warning: interworking not enabled.\n"
1414 " first occurrence: %B: thumb call to arm\n"
1415 " consider relinking with --support-old-code enabled"),
1416 h_sec->owner, input_bfd, name);
1417
1418 -- my_offset;
1419 myh->root.u.def.value = my_offset;
1420
1421 if (globals->support_old_code)
1422 {
1423 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1424 s->contents + my_offset);
1425
1426 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1427 s->contents + my_offset + 2);
1428
1429 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1430 s->contents + my_offset + 4);
1431
1432 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1433 s->contents + my_offset + 6);
1434
1435 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1436 s->contents + my_offset + 8);
1437
1438 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1439 s->contents + my_offset + 12);
1440
1441 /* Store the address of the function in the last word of the stub. */
1442 bfd_put_32 (output_bfd, h_val,
1443 s->contents + my_offset + 16);
1444
1445 if (info->base_file)
1446 arm_emit_base_file_entry (info, output_bfd, s,
1447 my_offset + 16);
1448 }
1449 else
1450 {
1451 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1452 s->contents + my_offset);
1453
1454 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1455 s->contents + my_offset + 2);
1456
1457 ret_offset =
1458 /* Address of destination of the stub. */
1459 ((bfd_signed_vma) h_val)
1460 - ((bfd_signed_vma)
1461 /* Offset from the start of the current section to the start of the stubs. */
1462 (s->output_offset
1463 /* Offset of the start of this stub from the start of the stubs. */
1464 + my_offset
1465 /* Address of the start of the current section. */
1466 + s->output_section->vma)
1467 /* The branch instruction is 4 bytes into the stub. */
1468 + 4
1469 /* ARM branches work from the pc of the instruction + 8. */
1470 + 8);
1471
1472 bfd_put_32 (output_bfd,
1473 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1474 s->contents + my_offset + 4);
1475
1476 }
1477 }
1478
1479 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1480
1481 /* Now go back and fix up the original BL insn to point
1482 to here. */
1483 ret_offset =
1484 s->output_offset
1485 + my_offset
1486 - (input_section->output_offset
1487 + rel->r_vaddr)
1488 -4;
1489
1490 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1491 - input_section->vma);
1492
1493 bfd_put_32 (output_bfd,
1494 (bfd_vma) insert_thumb_branch (tmp,
1495 ret_offset),
1496 contents + rel->r_vaddr - input_section->vma);
1497
1498 done = 1;
1499 }
1500 }
1501 #endif
1502 }
1503
1504 /* If the relocation type and destination symbol does not
1505 fall into one of the above categories, then we can just
1506 perform a direct link. */
1507
1508 if (done)
1509 rstat = bfd_reloc_ok;
1510 else
1511 if ( h->root.type == bfd_link_hash_defined
1512 || h->root.type == bfd_link_hash_defweak)
1513 {
1514 asection *sec;
1515
1516 sec = h->root.u.def.section;
1517 val = (h->root.u.def.value
1518 + sec->output_section->vma
1519 + sec->output_offset);
1520 }
1521
1522 else if (! info->relocatable)
1523 {
1524 if (! ((*info->callbacks->undefined_symbol)
1525 (info, h->root.root.string, input_bfd, input_section,
1526 rel->r_vaddr - input_section->vma, TRUE)))
1527 return FALSE;
1528 }
1529 }
1530
1531 if (info->base_file)
1532 {
1533 /* Emit a reloc if the backend thinks it needs it. */
1534 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1535 arm_emit_base_file_entry (info, output_bfd, input_section,
1536 rel->r_vaddr);
1537 }
1538
1539 if (done)
1540 rstat = bfd_reloc_ok;
1541 #ifndef ARM_WINCE
1542 /* Only perform this fix during the final link, not a relocatable link. */
1543 else if (! info->relocatable
1544 && howto->type == ARM_THUMB23)
1545 {
1546 /* This is pretty much a copy of what the default
1547 _bfd_final_link_relocate and _bfd_relocate_contents
1548 routines do to perform a relocation, with special
1549 processing for the split addressing of the Thumb BL
1550 instruction. Again, it would probably be simpler adding a
1551 ThumbBRANCH23 specific macro expansion into the default
1552 code. */
1553
1554 bfd_vma address = rel->r_vaddr - input_section->vma;
1555
1556 if (address > high_address)
1557 rstat = bfd_reloc_outofrange;
1558 else
1559 {
1560 bfd_vma relocation = val + addend;
1561 int size = bfd_get_reloc_size (howto);
1562 bfd_boolean overflow = FALSE;
1563 bfd_byte *location = contents + address;
1564 bfd_vma x = bfd_get_32 (input_bfd, location);
1565 bfd_vma src_mask = 0x007FFFFE;
1566 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1567 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1568 bfd_vma check;
1569 bfd_signed_vma signed_check;
1570 bfd_vma add;
1571 bfd_signed_vma signed_add;
1572
1573 BFD_ASSERT (size == 4);
1574
1575 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1576 relocation -= (input_section->output_section->vma
1577 + input_section->output_offset);
1578
1579 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1580 relocation -= address;
1581
1582 /* No need to negate the relocation with BRANCH23. */
1583 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1584 /* howto->rightshift == 1 */
1585
1586 /* Drop unwanted bits from the value we are relocating to. */
1587 check = relocation >> howto->rightshift;
1588
1589 /* If this is a signed value, the rightshift just dropped
1590 leading 1 bits (assuming twos complement). */
1591 if ((bfd_signed_vma) relocation >= 0)
1592 signed_check = check;
1593 else
1594 signed_check = (check
1595 | ((bfd_vma) - 1
1596 & ~((bfd_vma) - 1 >> howto->rightshift)));
1597
1598 /* Get the value from the object file. */
1599 if (bfd_big_endian (input_bfd))
1600 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1601 else
1602 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1603
1604 /* Get the value from the object file with an appropriate sign.
1605 The expression involving howto->src_mask isolates the upper
1606 bit of src_mask. If that bit is set in the value we are
1607 adding, it is negative, and we subtract out that number times
1608 two. If src_mask includes the highest possible bit, then we
1609 can not get the upper bit, but that does not matter since
1610 signed_add needs no adjustment to become negative in that
1611 case. */
1612 signed_add = add;
1613
1614 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1615 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1616
1617 /* howto->bitpos == 0 */
1618 /* Add the value from the object file, shifted so that it is a
1619 straight number. */
1620 signed_check += signed_add;
1621 relocation += signed_add;
1622
1623 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1624
1625 /* Assumes two's complement. */
1626 if ( signed_check > reloc_signed_max
1627 || signed_check < reloc_signed_min)
1628 overflow = TRUE;
1629
1630 /* Put the relocation into the correct bits.
1631 For a BLX instruction, make sure that the relocation is rounded up
1632 to a word boundary. This follows the semantics of the instruction
1633 which specifies that bit 1 of the target address will come from bit
1634 1 of the base address. */
1635 if (bfd_big_endian (input_bfd))
1636 {
1637 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1638 relocation += 2;
1639 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1640 }
1641 else
1642 {
1643 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1644 relocation += 2;
1645 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1646 }
1647
1648 /* Add the relocation to the correct bits of X. */
1649 x = ((x & ~howto->dst_mask) | relocation);
1650
1651 /* Put the relocated value back in the object file. */
1652 bfd_put_32 (input_bfd, x, location);
1653
1654 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1655 }
1656 }
1657 #endif
1658 else
1659 if (info->relocatable && ! howto->partial_inplace)
1660 rstat = bfd_reloc_ok;
1661 else
1662 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1663 contents,
1664 rel->r_vaddr - input_section->vma,
1665 val, addend);
1666 /* Only perform this fix during the final link, not a relocatable link. */
1667 if (! info->relocatable
1668 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1669 {
1670 /* Determine if we need to set the bottom bit of a relocated address
1671 because the address is the address of a Thumb code symbol. */
1672 int patchit = FALSE;
1673
1674 if (h != NULL
1675 && ( h->class == C_THUMBSTATFUNC
1676 || h->class == C_THUMBEXTFUNC))
1677 {
1678 patchit = TRUE;
1679 }
1680 else if (sym != NULL
1681 && sym->n_scnum > N_UNDEF)
1682 {
1683 /* No hash entry - use the symbol instead. */
1684 if ( sym->n_sclass == C_THUMBSTATFUNC
1685 || sym->n_sclass == C_THUMBEXTFUNC)
1686 patchit = TRUE;
1687 }
1688
1689 if (patchit)
1690 {
1691 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1692 bfd_vma x = bfd_get_32 (input_bfd, location);
1693
1694 bfd_put_32 (input_bfd, x | 1, location);
1695 }
1696 }
1697
1698 switch (rstat)
1699 {
1700 default:
1701 abort ();
1702 case bfd_reloc_ok:
1703 break;
1704 case bfd_reloc_outofrange:
1705 (*_bfd_error_handler)
1706 (_("%B: bad reloc address 0x%lx in section `%A'"),
1707 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1708 return FALSE;
1709 case bfd_reloc_overflow:
1710 {
1711 const char *name;
1712 char buf[SYMNMLEN + 1];
1713
1714 if (symndx == -1)
1715 name = "*ABS*";
1716 else if (h != NULL)
1717 name = NULL;
1718 else
1719 {
1720 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1721 if (name == NULL)
1722 return FALSE;
1723 }
1724
1725 if (! ((*info->callbacks->reloc_overflow)
1726 (info, (h ? &h->root : NULL), name, howto->name,
1727 (bfd_vma) 0, input_bfd, input_section,
1728 rel->r_vaddr - input_section->vma)))
1729 return FALSE;
1730 }
1731 }
1732 }
1733
1734 return TRUE;
1735 }
1736
1737 #ifndef COFF_IMAGE_WITH_PE
1738
1739 bfd_boolean
1740 bfd_arm_allocate_interworking_sections (struct bfd_link_info * info)
1741 {
1742 asection * s;
1743 bfd_byte * foo;
1744 struct coff_arm_link_hash_table * globals;
1745
1746 globals = coff_arm_hash_table (info);
1747
1748 BFD_ASSERT (globals != NULL);
1749
1750 if (globals->arm_glue_size != 0)
1751 {
1752 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1753
1754 s = bfd_get_section_by_name
1755 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1756
1757 BFD_ASSERT (s != NULL);
1758
1759 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1760
1761 s->size = globals->arm_glue_size;
1762 s->contents = foo;
1763 }
1764
1765 if (globals->thumb_glue_size != 0)
1766 {
1767 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1768
1769 s = bfd_get_section_by_name
1770 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1771
1772 BFD_ASSERT (s != NULL);
1773
1774 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1775
1776 s->size = globals->thumb_glue_size;
1777 s->contents = foo;
1778 }
1779
1780 return TRUE;
1781 }
1782
1783 static void
1784 record_arm_to_thumb_glue (struct bfd_link_info * info,
1785 struct coff_link_hash_entry * h)
1786 {
1787 const char * name = h->root.root.string;
1788 register asection * s;
1789 char * tmp_name;
1790 struct coff_link_hash_entry * myh;
1791 struct bfd_link_hash_entry * bh;
1792 struct coff_arm_link_hash_table * globals;
1793 bfd_vma val;
1794 bfd_size_type amt;
1795
1796 globals = coff_arm_hash_table (info);
1797
1798 BFD_ASSERT (globals != NULL);
1799 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1800
1801 s = bfd_get_section_by_name
1802 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1803
1804 BFD_ASSERT (s != NULL);
1805
1806 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1807 tmp_name = bfd_malloc (amt);
1808
1809 BFD_ASSERT (tmp_name);
1810
1811 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1812
1813 myh = coff_link_hash_lookup
1814 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1815
1816 if (myh != NULL)
1817 {
1818 free (tmp_name);
1819 /* We've already seen this guy. */
1820 return;
1821 }
1822
1823 /* The only trick here is using globals->arm_glue_size as the value. Even
1824 though the section isn't allocated yet, this is where we will be putting
1825 it. */
1826 bh = NULL;
1827 val = globals->arm_glue_size + 1;
1828 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1829 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1830
1831 free (tmp_name);
1832
1833 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1834
1835 return;
1836 }
1837
1838 #ifndef ARM_WINCE
1839 static void
1840 record_thumb_to_arm_glue (struct bfd_link_info * info,
1841 struct coff_link_hash_entry * h)
1842 {
1843 const char * name = h->root.root.string;
1844 asection * s;
1845 char * tmp_name;
1846 struct coff_link_hash_entry * myh;
1847 struct bfd_link_hash_entry * bh;
1848 struct coff_arm_link_hash_table * globals;
1849 bfd_vma val;
1850 bfd_size_type amt;
1851
1852 globals = coff_arm_hash_table (info);
1853
1854 BFD_ASSERT (globals != NULL);
1855 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1856
1857 s = bfd_get_section_by_name
1858 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1859
1860 BFD_ASSERT (s != NULL);
1861
1862 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1863 tmp_name = bfd_malloc (amt);
1864
1865 BFD_ASSERT (tmp_name);
1866
1867 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1868
1869 myh = coff_link_hash_lookup
1870 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1871
1872 if (myh != NULL)
1873 {
1874 free (tmp_name);
1875 /* We've already seen this guy. */
1876 return;
1877 }
1878
1879 bh = NULL;
1880 val = globals->thumb_glue_size + 1;
1881 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1882 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1883
1884 /* If we mark it 'thumb', the disassembler will do a better job. */
1885 myh = (struct coff_link_hash_entry *) bh;
1886 myh->class = C_THUMBEXTFUNC;
1887
1888 free (tmp_name);
1889
1890 /* Allocate another symbol to mark where we switch to arm mode. */
1891
1892 #define CHANGE_TO_ARM "__%s_change_to_arm"
1893 #define BACK_FROM_ARM "__%s_back_from_arm"
1894
1895 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1896 tmp_name = bfd_malloc (amt);
1897
1898 BFD_ASSERT (tmp_name);
1899
1900 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1901
1902 bh = NULL;
1903 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1904 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1905 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1906
1907 free (tmp_name);
1908
1909 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1910
1911 return;
1912 }
1913 #endif /* not ARM_WINCE */
1914
1915 /* Select a BFD to be used to hold the sections used by the glue code.
1916 This function is called from the linker scripts in ld/emultempl/
1917 {armcoff/pe}.em */
1918
1919 bfd_boolean
1920 bfd_arm_get_bfd_for_interworking (bfd * abfd,
1921 struct bfd_link_info * info)
1922 {
1923 struct coff_arm_link_hash_table * globals;
1924 flagword flags;
1925 asection * sec;
1926
1927 /* If we are only performing a partial link do not bother
1928 getting a bfd to hold the glue. */
1929 if (info->relocatable)
1930 return TRUE;
1931
1932 globals = coff_arm_hash_table (info);
1933
1934 BFD_ASSERT (globals != NULL);
1935
1936 if (globals->bfd_of_glue_owner != NULL)
1937 return TRUE;
1938
1939 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1940
1941 if (sec == NULL)
1942 {
1943 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1944 | SEC_CODE | SEC_READONLY);
1945 sec = bfd_make_section_with_flags (abfd, ARM2THUMB_GLUE_SECTION_NAME,
1946 flags);
1947 if (sec == NULL
1948 || ! bfd_set_section_alignment (abfd, sec, 2))
1949 return FALSE;
1950 }
1951
1952 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1953
1954 if (sec == NULL)
1955 {
1956 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1957 | SEC_CODE | SEC_READONLY);
1958 sec = bfd_make_section_with_flags (abfd, THUMB2ARM_GLUE_SECTION_NAME,
1959 flags);
1960
1961 if (sec == NULL
1962 || ! bfd_set_section_alignment (abfd, sec, 2))
1963 return FALSE;
1964 }
1965
1966 /* Save the bfd for later use. */
1967 globals->bfd_of_glue_owner = abfd;
1968
1969 return TRUE;
1970 }
1971
1972 bfd_boolean
1973 bfd_arm_process_before_allocation (bfd * abfd,
1974 struct bfd_link_info * info,
1975 int support_old_code)
1976 {
1977 asection * sec;
1978 struct coff_arm_link_hash_table * globals;
1979
1980 /* If we are only performing a partial link do not bother
1981 to construct any glue. */
1982 if (info->relocatable)
1983 return TRUE;
1984
1985 /* Here we have a bfd that is to be included on the link. We have a hook
1986 to do reloc rummaging, before section sizes are nailed down. */
1987 _bfd_coff_get_external_symbols (abfd);
1988
1989 globals = coff_arm_hash_table (info);
1990
1991 BFD_ASSERT (globals != NULL);
1992 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1993
1994 globals->support_old_code = support_old_code;
1995
1996 /* Rummage around all the relocs and map the glue vectors. */
1997 sec = abfd->sections;
1998
1999 if (sec == NULL)
2000 return TRUE;
2001
2002 for (; sec != NULL; sec = sec->next)
2003 {
2004 struct internal_reloc * i;
2005 struct internal_reloc * rel;
2006
2007 if (sec->reloc_count == 0)
2008 continue;
2009
2010 /* Load the relocs. */
2011 /* FIXME: there may be a storage leak here. */
2012 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2013
2014 BFD_ASSERT (i != 0);
2015
2016 for (rel = i; rel < i + sec->reloc_count; ++rel)
2017 {
2018 unsigned short r_type = rel->r_type;
2019 long symndx;
2020 struct coff_link_hash_entry * h;
2021
2022 symndx = rel->r_symndx;
2023
2024 /* If the relocation is not against a symbol it cannot concern us. */
2025 if (symndx == -1)
2026 continue;
2027
2028 /* If the index is outside of the range of our table, something has gone wrong. */
2029 if (symndx >= obj_conv_table_size (abfd))
2030 {
2031 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2032 abfd, symndx);
2033 continue;
2034 }
2035
2036 h = obj_coff_sym_hashes (abfd)[symndx];
2037
2038 /* If the relocation is against a static symbol it must be within
2039 the current section and so cannot be a cross ARM/Thumb relocation. */
2040 if (h == NULL)
2041 continue;
2042
2043 switch (r_type)
2044 {
2045 case ARM_26:
2046 /* This one is a call from arm code. We need to look up
2047 the target of the call. If it is a thumb target, we
2048 insert glue. */
2049
2050 if (h->class == C_THUMBEXTFUNC)
2051 record_arm_to_thumb_glue (info, h);
2052 break;
2053
2054 #ifndef ARM_WINCE
2055 case ARM_THUMB23:
2056 /* This one is a call from thumb code. We used to look
2057 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2058 up the target of the call. If it is an arm target, we
2059 insert glue. If the symbol does not exist it will be
2060 given a class of C_EXT and so we will generate a stub
2061 for it. This is not really a problem, since the link
2062 is doomed anyway. */
2063
2064 switch (h->class)
2065 {
2066 case C_EXT:
2067 case C_STAT:
2068 case C_LABEL:
2069 record_thumb_to_arm_glue (info, h);
2070 break;
2071 default:
2072 ;
2073 }
2074 break;
2075 #endif
2076
2077 default:
2078 break;
2079 }
2080 }
2081 }
2082
2083 return TRUE;
2084 }
2085
2086 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2087
2088 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2089 #define coff_relocate_section coff_arm_relocate_section
2090 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2091 #define coff_adjust_symndx coff_arm_adjust_symndx
2092 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2093 #define coff_final_link_postscript coff_arm_final_link_postscript
2094 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2095 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2096 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2097 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2098 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2099
2100 /* When doing a relocatable link, we want to convert ARM_26 relocs
2101 into ARM_26D relocs. */
2102
2103 static bfd_boolean
2104 coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
2105 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2106 bfd *ibfd,
2107 asection *sec,
2108 struct internal_reloc *irel,
2109 bfd_boolean *adjustedp)
2110 {
2111 if (irel->r_type == ARM_26)
2112 {
2113 struct coff_link_hash_entry *h;
2114
2115 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2116 if (h != NULL
2117 && (h->root.type == bfd_link_hash_defined
2118 || h->root.type == bfd_link_hash_defweak)
2119 && h->root.u.def.section->output_section == sec->output_section)
2120 irel->r_type = ARM_26D;
2121 }
2122 *adjustedp = FALSE;
2123 return TRUE;
2124 }
2125
2126 /* Called when merging the private data areas of two BFDs.
2127 This is important as it allows us to detect if we are
2128 attempting to merge binaries compiled for different ARM
2129 targets, eg different CPUs or different APCS's. */
2130
2131 static bfd_boolean
2132 coff_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
2133 {
2134 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2135
2136 if (ibfd == obfd)
2137 return TRUE;
2138
2139 /* If the two formats are different we cannot merge anything.
2140 This is not an error, since it is permissable to change the
2141 input and output formats. */
2142 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2143 || obfd->xvec->flavour != bfd_target_coff_flavour)
2144 return TRUE;
2145
2146 /* Determine what should happen if the input ARM architecture
2147 does not match the output ARM architecture. */
2148 if (! bfd_arm_merge_machines (ibfd, obfd))
2149 return FALSE;
2150
2151 /* Verify that the APCS is the same for the two BFDs. */
2152 if (APCS_SET (ibfd))
2153 {
2154 if (APCS_SET (obfd))
2155 {
2156 /* If the src and dest have different APCS flag bits set, fail. */
2157 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2158 {
2159 _bfd_error_handler
2160 /* xgettext: c-format */
2161 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2162 ibfd, obfd,
2163 APCS_26_FLAG (ibfd) ? 26 : 32,
2164 APCS_26_FLAG (obfd) ? 26 : 32
2165 );
2166
2167 bfd_set_error (bfd_error_wrong_format);
2168 return FALSE;
2169 }
2170
2171 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2172 {
2173 const char *msg;
2174
2175 if (APCS_FLOAT_FLAG (ibfd))
2176 /* xgettext: c-format */
2177 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2178 else
2179 /* xgettext: c-format */
2180 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2181
2182 _bfd_error_handler (msg, ibfd, obfd);
2183
2184 bfd_set_error (bfd_error_wrong_format);
2185 return FALSE;
2186 }
2187
2188 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2189 {
2190 const char * msg;
2191
2192 if (PIC_FLAG (ibfd))
2193 /* xgettext: c-format */
2194 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2195 else
2196 /* xgettext: c-format */
2197 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2198 _bfd_error_handler (msg, ibfd, obfd);
2199
2200 bfd_set_error (bfd_error_wrong_format);
2201 return FALSE;
2202 }
2203 }
2204 else
2205 {
2206 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2207
2208 /* Set up the arch and fields as well as these are probably wrong. */
2209 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2210 }
2211 }
2212
2213 /* Check the interworking support. */
2214 if (INTERWORK_SET (ibfd))
2215 {
2216 if (INTERWORK_SET (obfd))
2217 {
2218 /* If the src and dest differ in their interworking issue a warning. */
2219 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2220 {
2221 const char * msg;
2222
2223 if (INTERWORK_FLAG (ibfd))
2224 /* xgettext: c-format */
2225 msg = _("Warning: %B supports interworking, whereas %B does not");
2226 else
2227 /* xgettext: c-format */
2228 msg = _("Warning: %B does not support interworking, whereas %B does");
2229
2230 _bfd_error_handler (msg, ibfd, obfd);
2231 }
2232 }
2233 else
2234 {
2235 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2236 }
2237 }
2238
2239 return TRUE;
2240 }
2241
2242 /* Display the flags field. */
2243
2244 static bfd_boolean
2245 coff_arm_print_private_bfd_data (bfd * abfd, void * ptr)
2246 {
2247 FILE * file = (FILE *) ptr;
2248
2249 BFD_ASSERT (abfd != NULL && ptr != NULL);
2250
2251 /* xgettext:c-format */
2252 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2253
2254 if (APCS_SET (abfd))
2255 {
2256 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2257 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2258
2259 if (APCS_FLOAT_FLAG (abfd))
2260 fprintf (file, _(" [floats passed in float registers]"));
2261 else
2262 fprintf (file, _(" [floats passed in integer registers]"));
2263
2264 if (PIC_FLAG (abfd))
2265 fprintf (file, _(" [position independent]"));
2266 else
2267 fprintf (file, _(" [absolute position]"));
2268 }
2269
2270 if (! INTERWORK_SET (abfd))
2271 fprintf (file, _(" [interworking flag not initialised]"));
2272 else if (INTERWORK_FLAG (abfd))
2273 fprintf (file, _(" [interworking supported]"));
2274 else
2275 fprintf (file, _(" [interworking not supported]"));
2276
2277 fputc ('\n', file);
2278
2279 return TRUE;
2280 }
2281
2282 /* Copies the given flags into the coff_tdata.flags field.
2283 Typically these flags come from the f_flags[] field of
2284 the COFF filehdr structure, which contains important,
2285 target specific information.
2286 Note: Although this function is static, it is explicitly
2287 called from both coffcode.h and peicode.h. */
2288
2289 static bfd_boolean
2290 _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags)
2291 {
2292 flagword flag;
2293
2294 BFD_ASSERT (abfd != NULL);
2295
2296 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2297
2298 /* Make sure that the APCS field has not been initialised to the opposite
2299 value. */
2300 if (APCS_SET (abfd)
2301 && ( (APCS_26_FLAG (abfd) != flag)
2302 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2303 || (PIC_FLAG (abfd) != (flags & F_PIC))
2304 ))
2305 return FALSE;
2306
2307 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2308
2309 SET_APCS_FLAGS (abfd, flag);
2310
2311 flag = (flags & F_INTERWORK);
2312
2313 /* If the BFD has already had its interworking flag set, but it
2314 is different from the value that we have been asked to set,
2315 then assume that that merged code will not support interworking
2316 and set the flag accordingly. */
2317 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2318 {
2319 if (flag)
2320 /* xgettext: c-format */
2321 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2322 abfd);
2323 else
2324 /* xgettext: c-format */
2325 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2326 abfd);
2327 flag = 0;
2328 }
2329
2330 SET_INTERWORK_FLAG (abfd, flag);
2331
2332 return TRUE;
2333 }
2334
2335 /* Copy the important parts of the target specific data
2336 from one instance of a BFD to another. */
2337
2338 static bfd_boolean
2339 coff_arm_copy_private_bfd_data (bfd * src, bfd * dest)
2340 {
2341 BFD_ASSERT (src != NULL && dest != NULL);
2342
2343 if (src == dest)
2344 return TRUE;
2345
2346 /* If the destination is not in the same format as the source, do not do
2347 the copy. */
2348 if (src->xvec != dest->xvec)
2349 return TRUE;
2350
2351 /* Copy the flags field. */
2352 if (APCS_SET (src))
2353 {
2354 if (APCS_SET (dest))
2355 {
2356 /* If the src and dest have different APCS flag bits set, fail. */
2357 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2358 return FALSE;
2359
2360 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2361 return FALSE;
2362
2363 if (PIC_FLAG (dest) != PIC_FLAG (src))
2364 return FALSE;
2365 }
2366 else
2367 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2368 | PIC_FLAG (src));
2369 }
2370
2371 if (INTERWORK_SET (src))
2372 {
2373 if (INTERWORK_SET (dest))
2374 {
2375 /* If the src and dest have different interworking flags then turn
2376 off the interworking bit. */
2377 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2378 {
2379 if (INTERWORK_FLAG (dest))
2380 {
2381 /* xgettext:c-format */
2382 _bfd_error_handler (("\
2383 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2384 dest, src);
2385 }
2386
2387 SET_INTERWORK_FLAG (dest, 0);
2388 }
2389 }
2390 else
2391 {
2392 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2393 }
2394 }
2395
2396 return TRUE;
2397 }
2398
2399 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2400 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2401 #define LOCAL_LABEL_PREFIX ""
2402 #ifndef USER_LABEL_PREFIX
2403 #define USER_LABEL_PREFIX "_"
2404 #endif
2405
2406 /* Like _bfd_coff_is_local_label_name, but
2407 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2408 non-local.
2409 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2410 labels of the form Lxxx to be stripped. */
2411
2412 static bfd_boolean
2413 coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
2414 const char * name)
2415 {
2416 #ifdef USER_LABEL_PREFIX
2417 if (USER_LABEL_PREFIX[0] != 0)
2418 {
2419 size_t len = strlen (USER_LABEL_PREFIX);
2420
2421 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2422 return FALSE;
2423 }
2424 #endif
2425
2426 #ifdef LOCAL_LABEL_PREFIX
2427 /* If there is a prefix for local labels then look for this.
2428 If the prefix exists, but it is empty, then ignore the test. */
2429
2430 if (LOCAL_LABEL_PREFIX[0] != 0)
2431 {
2432 size_t len = strlen (LOCAL_LABEL_PREFIX);
2433
2434 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2435 return FALSE;
2436
2437 /* Perform the checks below for the rest of the name. */
2438 name += len;
2439 }
2440 #endif
2441
2442 return name[0] == 'L';
2443 }
2444
2445 /* This piece of machinery exists only to guarantee that the bfd that holds
2446 the glue section is written last.
2447
2448 This does depend on bfd_make_section attaching a new section to the
2449 end of the section list for the bfd. */
2450
2451 static bfd_boolean
2452 coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info)
2453 {
2454 return (sub->output_has_begun
2455 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2456 }
2457
2458 static bfd_boolean
2459 coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED,
2460 struct coff_final_link_info * pfinfo)
2461 {
2462 struct coff_arm_link_hash_table * globals;
2463
2464 globals = coff_arm_hash_table (pfinfo->info);
2465
2466 BFD_ASSERT (globals != NULL);
2467
2468 if (globals->bfd_of_glue_owner != NULL)
2469 {
2470 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2471 return FALSE;
2472
2473 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2474 }
2475
2476 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2477 }
2478
2479 #include "coffcode.h"
2480
2481 #ifndef TARGET_LITTLE_SYM
2482 #define TARGET_LITTLE_SYM armcoff_little_vec
2483 #endif
2484 #ifndef TARGET_LITTLE_NAME
2485 #define TARGET_LITTLE_NAME "coff-arm-little"
2486 #endif
2487 #ifndef TARGET_BIG_SYM
2488 #define TARGET_BIG_SYM armcoff_big_vec
2489 #endif
2490 #ifndef TARGET_BIG_NAME
2491 #define TARGET_BIG_NAME "coff-arm-big"
2492 #endif
2493
2494 #ifndef TARGET_UNDERSCORE
2495 #define TARGET_UNDERSCORE 0
2496 #endif
2497
2498 #ifndef EXTRA_S_FLAGS
2499 #ifdef COFF_WITH_PE
2500 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2501 #else
2502 #define EXTRA_S_FLAGS SEC_CODE
2503 #endif
2504 #endif
2505
2506 /* Forward declaration for use initialising alternative_target field. */
2507 extern const bfd_target TARGET_BIG_SYM ;
2508
2509 /* Target vectors. */
2510 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2511 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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