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
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
coff_arm_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol ATTRIBUTE_UNUSED,void * data,asection * input_section ATTRIBUTE_UNUSED,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)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 FALSE,
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 FALSE,
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 FALSE,
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 FALSE,
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 FALSE,
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
in_reloc_p(bfd * abfd ATTRIBUTE_UNUSED,reloc_howto_type * howto)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 *
coff_arm_rtype_to_howto(bfd * abfd ATTRIBUTE_UNUSED,asection * sec,struct internal_reloc * rel,struct coff_link_hash_entry * h ATTRIBUTE_UNUSED,struct internal_syment * sym ATTRIBUTE_UNUSED,bfd_vma * addendp)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
aoutarm_fix_pcrel_26_done(bfd * abfd ATTRIBUTE_UNUSED,arelent * reloc_entry ATTRIBUTE_UNUSED,asymbol * symbol ATTRIBUTE_UNUSED,void * data ATTRIBUTE_UNUSED,asection * input_section ATTRIBUTE_UNUSED,bfd * output_bfd ATTRIBUTE_UNUSED,char ** error_message ATTRIBUTE_UNUSED)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
aoutarm_fix_pcrel_26(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)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
coff_thumb_pcrel_common(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED,thumb_pcrel_branchtype btype)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
coff_thumb_pcrel_23(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)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
coff_thumb_pcrel_9(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)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
coff_thumb_pcrel_12(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)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 *
coff_arm_reloc_type_lookup(bfd * abfd,bfd_reloc_code_real_type code)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 *
coff_arm_link_hash_table_create(bfd * abfd)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
883 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
884 {
885 free (ret);
886 return NULL;
887 }
888
889 ret->thumb_glue_size = 0;
890 ret->arm_glue_size = 0;
891 ret->bfd_of_glue_owner = NULL;
892
893 return & ret->root.root;
894 }
895
896 static void
arm_emit_base_file_entry(struct bfd_link_info * info,bfd * output_bfd,asection * input_section,bfd_vma reloc_offset)897 arm_emit_base_file_entry (struct bfd_link_info *info,
898 bfd *output_bfd,
899 asection *input_section,
900 bfd_vma reloc_offset)
901 {
902 bfd_vma addr = reloc_offset
903 - input_section->vma
904 + input_section->output_offset
905 + input_section->output_section->vma;
906
907 if (coff_data (output_bfd)->pe)
908 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
909 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
910
911 }
912
913 #ifndef ARM_WINCE
914 /* The thumb form of a long branch is a bit finicky, because the offset
915 encoding is split over two fields, each in it's own instruction. They
916 can occur in any order. So given a thumb form of long branch, and an
917 offset, insert the offset into the thumb branch and return finished
918 instruction.
919
920 It takes two thumb instructions to encode the target address. Each has
921 11 bits to invest. The upper 11 bits are stored in one (identified by
922 H-0.. see below), the lower 11 bits are stored in the other (identified
923 by H-1).
924
925 Combine together and shifted left by 1 (it's a half word address) and
926 there you have it.
927
928 Op: 1111 = F,
929 H-0, upper address-0 = 000
930 Op: 1111 = F,
931 H-1, lower address-0 = 800
932
933 They can be ordered either way, but the arm tools I've seen always put
934 the lower one first. It probably doesn't matter. krk@cygnus.com
935
936 XXX: Actually the order does matter. The second instruction (H-1)
937 moves the computed address into the PC, so it must be the second one
938 in the sequence. The problem, however is that whilst little endian code
939 stores the instructions in HI then LOW order, big endian code does the
940 reverse. nickc@cygnus.com. */
941
942 #define LOW_HI_ORDER 0xF800F000
943 #define HI_LOW_ORDER 0xF000F800
944
945 static insn32
insert_thumb_branch(insn32 br_insn,int rel_off)946 insert_thumb_branch (insn32 br_insn, int rel_off)
947 {
948 unsigned int low_bits;
949 unsigned int high_bits;
950
951 BFD_ASSERT ((rel_off & 1) != 1);
952
953 rel_off >>= 1; /* Half word aligned address. */
954 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
955 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
956
957 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
958 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
959 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
960 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
961 else
962 /* FIXME: the BFD library should never abort except for internal errors
963 - it should return an error status. */
964 abort (); /* Error - not a valid branch instruction form. */
965
966 return br_insn;
967 }
968
969
970 static struct coff_link_hash_entry *
find_thumb_glue(struct bfd_link_info * info,const char * name,bfd * input_bfd)971 find_thumb_glue (struct bfd_link_info *info,
972 const char *name,
973 bfd *input_bfd)
974 {
975 char *tmp_name;
976 struct coff_link_hash_entry *myh;
977 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
978
979 tmp_name = bfd_malloc (amt);
980
981 BFD_ASSERT (tmp_name);
982
983 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
984
985 myh = coff_link_hash_lookup
986 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
987
988 if (myh == NULL)
989 /* xgettext:c-format */
990 _bfd_error_handler (_("%B: unable to find THUMB glue '%s' for `%s'"),
991 input_bfd, tmp_name, name);
992
993 free (tmp_name);
994
995 return myh;
996 }
997 #endif /* not ARM_WINCE */
998
999 static struct coff_link_hash_entry *
find_arm_glue(struct bfd_link_info * info,const char * name,bfd * input_bfd)1000 find_arm_glue (struct bfd_link_info *info,
1001 const char *name,
1002 bfd *input_bfd)
1003 {
1004 char *tmp_name;
1005 struct coff_link_hash_entry * myh;
1006 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1007
1008 tmp_name = bfd_malloc (amt);
1009
1010 BFD_ASSERT (tmp_name);
1011
1012 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1013
1014 myh = coff_link_hash_lookup
1015 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1016
1017 if (myh == NULL)
1018 /* xgettext:c-format */
1019 _bfd_error_handler (_("%B: unable to find ARM glue '%s' for `%s'"),
1020 input_bfd, tmp_name, name);
1021
1022 free (tmp_name);
1023
1024 return myh;
1025 }
1026
1027 /*
1028 ARM->Thumb glue:
1029
1030 .arm
1031 __func_from_arm:
1032 ldr r12, __func_addr
1033 bx r12
1034 __func_addr:
1035 .word func @ behave as if you saw a ARM_32 reloc
1036 */
1037
1038 #define ARM2THUMB_GLUE_SIZE 12
1039 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1040 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1041 static const insn32 a2t3_func_addr_insn = 0x00000001;
1042
1043 /*
1044 Thumb->ARM: Thumb->(non-interworking aware) ARM
1045
1046 .thumb .thumb
1047 .align 2 .align 2
1048 __func_from_thumb: __func_from_thumb:
1049 bx pc push {r6, lr}
1050 nop ldr r6, __func_addr
1051 .arm mov lr, pc
1052 __func_change_to_arm: bx r6
1053 b func .arm
1054 __func_back_to_thumb:
1055 ldmia r13! {r6, lr}
1056 bx lr
1057 __func_addr:
1058 .word func
1059 */
1060
1061 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1062 #ifndef ARM_WINCE
1063 static const insn16 t2a1_bx_pc_insn = 0x4778;
1064 static const insn16 t2a2_noop_insn = 0x46c0;
1065 static const insn32 t2a3_b_insn = 0xea000000;
1066
1067 static const insn16 t2a1_push_insn = 0xb540;
1068 static const insn16 t2a2_ldr_insn = 0x4e03;
1069 static const insn16 t2a3_mov_insn = 0x46fe;
1070 static const insn16 t2a4_bx_insn = 0x4730;
1071 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1072 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1073 #endif
1074
1075 /* TODO:
1076 We should really create new local (static) symbols in destination
1077 object for each stub we create. We should also create local
1078 (static) symbols within the stubs when switching between ARM and
1079 Thumb code. This will ensure that the debugger and disassembler
1080 can present a better view of stubs.
1081
1082 We can treat stubs like literal sections, and for the THUMB9 ones
1083 (short addressing range) we should be able to insert the stubs
1084 between sections. i.e. the simplest approach (since relocations
1085 are done on a section basis) is to dump the stubs at the end of
1086 processing a section. That way we can always try and minimise the
1087 offset to and from a stub. However, this does not map well onto
1088 the way that the linker/BFD does its work: mapping all input
1089 sections to output sections via the linker script before doing
1090 all the processing.
1091
1092 Unfortunately it may be easier to just to disallow short range
1093 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1094 only branch-and-link (BL) calls. This will simplify the processing
1095 since we can then put all of the stubs into their own section.
1096
1097 TODO:
1098 On a different subject, rather than complaining when a
1099 branch cannot fit in the number of bits available for the
1100 instruction we should generate a trampoline stub (needed to
1101 address the complete 32bit address space). */
1102
1103 /* The standard COFF backend linker does not cope with the special
1104 Thumb BRANCH23 relocation. The alternative would be to split the
1105 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1106 bit simpler simply providing our own relocation driver. */
1107
1108 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1109 This code is a very slightly modified copy of
1110 _bfd_coff_generic_relocate_section. It would be a much more
1111 maintainable solution to have a MACRO that could be expanded within
1112 _bfd_coff_generic_relocate_section that would only be provided for
1113 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1114 is different from the original. */
1115
1116 static bfd_boolean
coff_arm_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,struct internal_reloc * relocs,struct internal_syment * syms,asection ** sections)1117 coff_arm_relocate_section (bfd *output_bfd,
1118 struct bfd_link_info *info,
1119 bfd *input_bfd,
1120 asection *input_section,
1121 bfd_byte *contents,
1122 struct internal_reloc *relocs,
1123 struct internal_syment *syms,
1124 asection **sections)
1125 {
1126 struct internal_reloc * rel;
1127 struct internal_reloc * relend;
1128 #ifndef ARM_WINCE
1129 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1130 #endif
1131
1132 rel = relocs;
1133 relend = rel + input_section->reloc_count;
1134
1135 for (; rel < relend; rel++)
1136 {
1137 int done = 0;
1138 long symndx;
1139 struct coff_link_hash_entry * h;
1140 struct internal_syment * sym;
1141 bfd_vma addend;
1142 bfd_vma val;
1143 reloc_howto_type * howto;
1144 bfd_reloc_status_type rstat;
1145 bfd_vma h_val;
1146
1147 symndx = rel->r_symndx;
1148
1149 if (symndx == -1)
1150 {
1151 h = NULL;
1152 sym = NULL;
1153 }
1154 else
1155 {
1156 h = obj_coff_sym_hashes (input_bfd)[symndx];
1157 sym = syms + symndx;
1158 }
1159
1160 /* COFF treats common symbols in one of two ways. Either the
1161 size of the symbol is included in the section contents, or it
1162 is not. We assume that the size is not included, and force
1163 the rtype_to_howto function to adjust the addend as needed. */
1164
1165 if (sym != NULL && sym->n_scnum != 0)
1166 addend = - sym->n_value;
1167 else
1168 addend = 0;
1169
1170 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1171 sym, &addend);
1172 if (howto == NULL)
1173 return FALSE;
1174
1175 /* The relocation_section function will skip pcrel_offset relocs
1176 when doing a relocatable link. However, we want to convert
1177 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1178 this case without pcrel_offset set, and adjust the addend to
1179 compensate. 'partial_inplace' is also set, since we want 'done'
1180 relocations to be reflected in section's data. */
1181 if (rel->r_type == ARM_26
1182 && h != NULL
1183 && info->relocatable
1184 && (h->root.type == bfd_link_hash_defined
1185 || h->root.type == bfd_link_hash_defweak)
1186 && (h->root.u.def.section->output_section
1187 == input_section->output_section))
1188 {
1189 static reloc_howto_type fake_arm26_reloc =
1190 HOWTO (ARM_26,
1191 2,
1192 2,
1193 24,
1194 TRUE,
1195 0,
1196 complain_overflow_signed,
1197 aoutarm_fix_pcrel_26 ,
1198 "ARM_26",
1199 TRUE,
1200 0x00ffffff,
1201 0x00ffffff,
1202 FALSE);
1203
1204 addend -= rel->r_vaddr - input_section->vma;
1205 #ifdef ARM_WINCE
1206 /* FIXME: I don't know why, but the hack is necessary for correct
1207 generation of bl's instruction offset. */
1208 addend -= 8;
1209 #endif
1210 howto = &fake_arm26_reloc;
1211 }
1212
1213 #ifdef ARM_WINCE
1214 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1215 the next opcode's pc, so is off by one. */
1216 #endif
1217
1218 /* If we are doing a relocatable link, then we can just ignore
1219 a PC relative reloc that is pcrel_offset. It will already
1220 have the correct value. If this is not a relocatable link,
1221 then we should ignore the symbol value. */
1222 if (howto->pc_relative && howto->pcrel_offset)
1223 {
1224 if (info->relocatable)
1225 continue;
1226 /* FIXME - it is not clear which targets need this next test
1227 and which do not. It is known that it is needed for the
1228 VxWorks and EPOC-PE targets, but it is also known that it
1229 was suppressed for other ARM targets. This ought to be
1230 sorted out one day. */
1231 #ifdef ARM_COFF_BUGFIX
1232 /* We must not ignore the symbol value. If the symbol is
1233 within the same section, the relocation should have already
1234 been fixed, but if it is not, we'll be handed a reloc into
1235 the beginning of the symbol's section, so we must not cancel
1236 out the symbol's value, otherwise we'll be adding it in
1237 twice. */
1238 if (sym != NULL && sym->n_scnum != 0)
1239 addend += sym->n_value;
1240 #endif
1241 }
1242
1243 val = 0;
1244
1245 if (h == NULL)
1246 {
1247 asection *sec;
1248
1249 if (symndx == -1)
1250 {
1251 sec = bfd_abs_section_ptr;
1252 val = 0;
1253 }
1254 else
1255 {
1256 sec = sections[symndx];
1257 val = (sec->output_section->vma
1258 + sec->output_offset
1259 + sym->n_value
1260 - sec->vma);
1261 }
1262 }
1263 else
1264 {
1265 /* We don't output the stubs if we are generating a
1266 relocatable output file, since we may as well leave the
1267 stub generation to the final linker pass. If we fail to
1268 verify that the name is defined, we'll try to build stubs
1269 for an undefined name... */
1270 if (! info->relocatable
1271 && ( h->root.type == bfd_link_hash_defined
1272 || h->root.type == bfd_link_hash_defweak))
1273 {
1274 asection * h_sec = h->root.u.def.section;
1275 const char * name = h->root.root.string;
1276
1277 /* h locates the symbol referenced in the reloc. */
1278 h_val = (h->root.u.def.value
1279 + h_sec->output_section->vma
1280 + h_sec->output_offset);
1281
1282 if (howto->type == ARM_26)
1283 {
1284 if ( h->class == C_THUMBSTATFUNC
1285 || h->class == C_THUMBEXTFUNC)
1286 {
1287 /* Arm code calling a Thumb function. */
1288 unsigned long int tmp;
1289 bfd_vma my_offset;
1290 asection * s;
1291 long int ret_offset;
1292 struct coff_link_hash_entry * myh;
1293 struct coff_arm_link_hash_table * globals;
1294
1295 myh = find_arm_glue (info, name, input_bfd);
1296 if (myh == NULL)
1297 return FALSE;
1298
1299 globals = coff_arm_hash_table (info);
1300
1301 BFD_ASSERT (globals != NULL);
1302 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1303
1304 my_offset = myh->root.u.def.value;
1305
1306 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1307 ARM2THUMB_GLUE_SECTION_NAME);
1308 BFD_ASSERT (s != NULL);
1309 BFD_ASSERT (s->contents != NULL);
1310 BFD_ASSERT (s->output_section != NULL);
1311
1312 if ((my_offset & 0x01) == 0x01)
1313 {
1314 if (h_sec->owner != NULL
1315 && INTERWORK_SET (h_sec->owner)
1316 && ! INTERWORK_FLAG (h_sec->owner))
1317 _bfd_error_handler
1318 /* xgettext:c-format */
1319 (_("%B(%s): warning: interworking not enabled.\n"
1320 " first occurrence: %B: arm call to thumb"),
1321 h_sec->owner, input_bfd, name);
1322
1323 --my_offset;
1324 myh->root.u.def.value = my_offset;
1325
1326 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1327 s->contents + my_offset);
1328
1329 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1330 s->contents + my_offset + 4);
1331
1332 /* It's a thumb address. Add the low order bit. */
1333 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1334 s->contents + my_offset + 8);
1335
1336 if (info->base_file)
1337 arm_emit_base_file_entry (info, output_bfd, s,
1338 my_offset + 8);
1339
1340 }
1341
1342 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1343
1344 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1345 - input_section->vma);
1346
1347 tmp = tmp & 0xFF000000;
1348
1349 /* Somehow these are both 4 too far, so subtract 8. */
1350 ret_offset =
1351 s->output_offset
1352 + my_offset
1353 + s->output_section->vma
1354 - (input_section->output_offset
1355 + input_section->output_section->vma
1356 + rel->r_vaddr)
1357 - 8;
1358
1359 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1360
1361 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1362 contents + rel->r_vaddr - input_section->vma);
1363 done = 1;
1364 }
1365 }
1366
1367 #ifndef ARM_WINCE
1368 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1369 else if (howto->type == ARM_THUMB23)
1370 {
1371 if ( h->class == C_EXT
1372 || h->class == C_STAT
1373 || h->class == C_LABEL)
1374 {
1375 /* Thumb code calling an ARM function. */
1376 asection * s = 0;
1377 bfd_vma my_offset;
1378 unsigned long int tmp;
1379 long int ret_offset;
1380 struct coff_link_hash_entry * myh;
1381 struct coff_arm_link_hash_table * globals;
1382
1383 myh = find_thumb_glue (info, name, input_bfd);
1384 if (myh == NULL)
1385 return FALSE;
1386
1387 globals = coff_arm_hash_table (info);
1388
1389 BFD_ASSERT (globals != NULL);
1390 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1391
1392 my_offset = myh->root.u.def.value;
1393
1394 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1395 THUMB2ARM_GLUE_SECTION_NAME);
1396
1397 BFD_ASSERT (s != NULL);
1398 BFD_ASSERT (s->contents != NULL);
1399 BFD_ASSERT (s->output_section != NULL);
1400
1401 if ((my_offset & 0x01) == 0x01)
1402 {
1403 if (h_sec->owner != NULL
1404 && INTERWORK_SET (h_sec->owner)
1405 && ! INTERWORK_FLAG (h_sec->owner)
1406 && ! globals->support_old_code)
1407 _bfd_error_handler
1408 /* xgettext:c-format */
1409 (_("%B(%s): warning: interworking not enabled.\n"
1410 " first occurrence: %B: thumb call to arm\n"
1411 " consider relinking with --support-old-code enabled"),
1412 h_sec->owner, input_bfd, name);
1413
1414 -- my_offset;
1415 myh->root.u.def.value = my_offset;
1416
1417 if (globals->support_old_code)
1418 {
1419 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1420 s->contents + my_offset);
1421
1422 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1423 s->contents + my_offset + 2);
1424
1425 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1426 s->contents + my_offset + 4);
1427
1428 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1429 s->contents + my_offset + 6);
1430
1431 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1432 s->contents + my_offset + 8);
1433
1434 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1435 s->contents + my_offset + 12);
1436
1437 /* Store the address of the function in the last word of the stub. */
1438 bfd_put_32 (output_bfd, h_val,
1439 s->contents + my_offset + 16);
1440
1441 if (info->base_file)
1442 arm_emit_base_file_entry (info, output_bfd, s,
1443 my_offset + 16);
1444 }
1445 else
1446 {
1447 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1448 s->contents + my_offset);
1449
1450 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1451 s->contents + my_offset + 2);
1452
1453 ret_offset =
1454 /* Address of destination of the stub. */
1455 ((bfd_signed_vma) h_val)
1456 - ((bfd_signed_vma)
1457 /* Offset from the start of the current section to the start of the stubs. */
1458 (s->output_offset
1459 /* Offset of the start of this stub from the start of the stubs. */
1460 + my_offset
1461 /* Address of the start of the current section. */
1462 + s->output_section->vma)
1463 /* The branch instruction is 4 bytes into the stub. */
1464 + 4
1465 /* ARM branches work from the pc of the instruction + 8. */
1466 + 8);
1467
1468 bfd_put_32 (output_bfd,
1469 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1470 s->contents + my_offset + 4);
1471
1472 }
1473 }
1474
1475 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1476
1477 /* Now go back and fix up the original BL insn to point
1478 to here. */
1479 ret_offset =
1480 s->output_offset
1481 + my_offset
1482 - (input_section->output_offset
1483 + rel->r_vaddr)
1484 -4;
1485
1486 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1487 - input_section->vma);
1488
1489 bfd_put_32 (output_bfd,
1490 (bfd_vma) insert_thumb_branch (tmp,
1491 ret_offset),
1492 contents + rel->r_vaddr - input_section->vma);
1493
1494 done = 1;
1495 }
1496 }
1497 #endif
1498 }
1499
1500 /* If the relocation type and destination symbol does not
1501 fall into one of the above categories, then we can just
1502 perform a direct link. */
1503
1504 if (done)
1505 rstat = bfd_reloc_ok;
1506 else
1507 if ( h->root.type == bfd_link_hash_defined
1508 || h->root.type == bfd_link_hash_defweak)
1509 {
1510 asection *sec;
1511
1512 sec = h->root.u.def.section;
1513 val = (h->root.u.def.value
1514 + sec->output_section->vma
1515 + sec->output_offset);
1516 }
1517
1518 else if (! info->relocatable)
1519 {
1520 if (! ((*info->callbacks->undefined_symbol)
1521 (info, h->root.root.string, input_bfd, input_section,
1522 rel->r_vaddr - input_section->vma, TRUE)))
1523 return FALSE;
1524 }
1525 }
1526
1527 if (info->base_file)
1528 {
1529 /* Emit a reloc if the backend thinks it needs it. */
1530 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1531 arm_emit_base_file_entry (info, output_bfd, input_section,
1532 rel->r_vaddr);
1533 }
1534
1535 if (done)
1536 rstat = bfd_reloc_ok;
1537 #ifndef ARM_WINCE
1538 /* Only perform this fix during the final link, not a relocatable link. */
1539 else if (! info->relocatable
1540 && howto->type == ARM_THUMB23)
1541 {
1542 /* This is pretty much a copy of what the default
1543 _bfd_final_link_relocate and _bfd_relocate_contents
1544 routines do to perform a relocation, with special
1545 processing for the split addressing of the Thumb BL
1546 instruction. Again, it would probably be simpler adding a
1547 ThumbBRANCH23 specific macro expansion into the default
1548 code. */
1549
1550 bfd_vma address = rel->r_vaddr - input_section->vma;
1551
1552 if (address > high_address)
1553 rstat = bfd_reloc_outofrange;
1554 else
1555 {
1556 bfd_vma relocation = val + addend;
1557 int size = bfd_get_reloc_size (howto);
1558 bfd_boolean overflow = FALSE;
1559 bfd_byte *location = contents + address;
1560 bfd_vma x = bfd_get_32 (input_bfd, location);
1561 bfd_vma src_mask = 0x007FFFFE;
1562 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1563 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1564 bfd_vma check;
1565 bfd_signed_vma signed_check;
1566 bfd_vma add;
1567 bfd_signed_vma signed_add;
1568
1569 BFD_ASSERT (size == 4);
1570
1571 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1572 relocation -= (input_section->output_section->vma
1573 + input_section->output_offset);
1574
1575 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1576 relocation -= address;
1577
1578 /* No need to negate the relocation with BRANCH23. */
1579 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1580 /* howto->rightshift == 1 */
1581
1582 /* Drop unwanted bits from the value we are relocating to. */
1583 check = relocation >> howto->rightshift;
1584
1585 /* If this is a signed value, the rightshift just dropped
1586 leading 1 bits (assuming twos complement). */
1587 if ((bfd_signed_vma) relocation >= 0)
1588 signed_check = check;
1589 else
1590 signed_check = (check
1591 | ((bfd_vma) - 1
1592 & ~((bfd_vma) - 1 >> howto->rightshift)));
1593
1594 /* Get the value from the object file. */
1595 if (bfd_big_endian (input_bfd))
1596 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1597 else
1598 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1599
1600 /* Get the value from the object file with an appropriate sign.
1601 The expression involving howto->src_mask isolates the upper
1602 bit of src_mask. If that bit is set in the value we are
1603 adding, it is negative, and we subtract out that number times
1604 two. If src_mask includes the highest possible bit, then we
1605 can not get the upper bit, but that does not matter since
1606 signed_add needs no adjustment to become negative in that
1607 case. */
1608 signed_add = add;
1609
1610 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1611 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1612
1613 /* howto->bitpos == 0 */
1614 /* Add the value from the object file, shifted so that it is a
1615 straight number. */
1616 signed_check += signed_add;
1617 relocation += signed_add;
1618
1619 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1620
1621 /* Assumes two's complement. */
1622 if ( signed_check > reloc_signed_max
1623 || signed_check < reloc_signed_min)
1624 overflow = TRUE;
1625
1626 /* Put the relocation into the correct bits.
1627 For a BLX instruction, make sure that the relocation is rounded up
1628 to a word boundary. This follows the semantics of the instruction
1629 which specifies that bit 1 of the target address will come from bit
1630 1 of the base address. */
1631 if (bfd_big_endian (input_bfd))
1632 {
1633 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1634 relocation += 2;
1635 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1636 }
1637 else
1638 {
1639 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1640 relocation += 2;
1641 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1642 }
1643
1644 /* Add the relocation to the correct bits of X. */
1645 x = ((x & ~howto->dst_mask) | relocation);
1646
1647 /* Put the relocated value back in the object file. */
1648 bfd_put_32 (input_bfd, x, location);
1649
1650 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1651 }
1652 }
1653 #endif
1654 else
1655 if (info->relocatable && ! howto->partial_inplace)
1656 rstat = bfd_reloc_ok;
1657 else
1658 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1659 contents,
1660 rel->r_vaddr - input_section->vma,
1661 val, addend);
1662 /* Only perform this fix during the final link, not a relocatable link. */
1663 if (! info->relocatable
1664 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1665 {
1666 /* Determine if we need to set the bottom bit of a relocated address
1667 because the address is the address of a Thumb code symbol. */
1668 int patchit = FALSE;
1669
1670 if (h != NULL
1671 && ( h->class == C_THUMBSTATFUNC
1672 || h->class == C_THUMBEXTFUNC))
1673 {
1674 patchit = TRUE;
1675 }
1676 else if (sym != NULL
1677 && sym->n_scnum > N_UNDEF)
1678 {
1679 /* No hash entry - use the symbol instead. */
1680 if ( sym->n_sclass == C_THUMBSTATFUNC
1681 || sym->n_sclass == C_THUMBEXTFUNC)
1682 patchit = TRUE;
1683 }
1684
1685 if (patchit)
1686 {
1687 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1688 bfd_vma x = bfd_get_32 (input_bfd, location);
1689
1690 bfd_put_32 (input_bfd, x | 1, location);
1691 }
1692 }
1693
1694 switch (rstat)
1695 {
1696 default:
1697 abort ();
1698 case bfd_reloc_ok:
1699 break;
1700 case bfd_reloc_outofrange:
1701 (*_bfd_error_handler)
1702 (_("%B: bad reloc address 0x%lx in section `%A'"),
1703 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1704 return FALSE;
1705 case bfd_reloc_overflow:
1706 {
1707 const char *name;
1708 char buf[SYMNMLEN + 1];
1709
1710 if (symndx == -1)
1711 name = "*ABS*";
1712 else if (h != NULL)
1713 name = NULL;
1714 else
1715 {
1716 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1717 if (name == NULL)
1718 return FALSE;
1719 }
1720
1721 if (! ((*info->callbacks->reloc_overflow)
1722 (info, (h ? &h->root : NULL), name, howto->name,
1723 (bfd_vma) 0, input_bfd, input_section,
1724 rel->r_vaddr - input_section->vma)))
1725 return FALSE;
1726 }
1727 }
1728 }
1729
1730 return TRUE;
1731 }
1732
1733 #ifndef COFF_IMAGE_WITH_PE
1734
1735 bfd_boolean
bfd_arm_allocate_interworking_sections(struct bfd_link_info * info)1736 bfd_arm_allocate_interworking_sections (struct bfd_link_info * info)
1737 {
1738 asection * s;
1739 bfd_byte * foo;
1740 struct coff_arm_link_hash_table * globals;
1741
1742 globals = coff_arm_hash_table (info);
1743
1744 BFD_ASSERT (globals != NULL);
1745
1746 if (globals->arm_glue_size != 0)
1747 {
1748 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1749
1750 s = bfd_get_section_by_name
1751 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1752
1753 BFD_ASSERT (s != NULL);
1754
1755 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1756
1757 s->size = globals->arm_glue_size;
1758 s->contents = foo;
1759 }
1760
1761 if (globals->thumb_glue_size != 0)
1762 {
1763 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1764
1765 s = bfd_get_section_by_name
1766 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1767
1768 BFD_ASSERT (s != NULL);
1769
1770 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1771
1772 s->size = globals->thumb_glue_size;
1773 s->contents = foo;
1774 }
1775
1776 return TRUE;
1777 }
1778
1779 static void
record_arm_to_thumb_glue(struct bfd_link_info * info,struct coff_link_hash_entry * h)1780 record_arm_to_thumb_glue (struct bfd_link_info * info,
1781 struct coff_link_hash_entry * h)
1782 {
1783 const char * name = h->root.root.string;
1784 register asection * s;
1785 char * tmp_name;
1786 struct coff_link_hash_entry * myh;
1787 struct bfd_link_hash_entry * bh;
1788 struct coff_arm_link_hash_table * globals;
1789 bfd_vma val;
1790 bfd_size_type amt;
1791
1792 globals = coff_arm_hash_table (info);
1793
1794 BFD_ASSERT (globals != NULL);
1795 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1796
1797 s = bfd_get_section_by_name
1798 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1799
1800 BFD_ASSERT (s != NULL);
1801
1802 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1803 tmp_name = bfd_malloc (amt);
1804
1805 BFD_ASSERT (tmp_name);
1806
1807 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1808
1809 myh = coff_link_hash_lookup
1810 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1811
1812 if (myh != NULL)
1813 {
1814 free (tmp_name);
1815 /* We've already seen this guy. */
1816 return;
1817 }
1818
1819 /* The only trick here is using globals->arm_glue_size as the value. Even
1820 though the section isn't allocated yet, this is where we will be putting
1821 it. */
1822 bh = NULL;
1823 val = globals->arm_glue_size + 1;
1824 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1825 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1826
1827 free (tmp_name);
1828
1829 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1830
1831 return;
1832 }
1833
1834 #ifndef ARM_WINCE
1835 static void
record_thumb_to_arm_glue(struct bfd_link_info * info,struct coff_link_hash_entry * h)1836 record_thumb_to_arm_glue (struct bfd_link_info * info,
1837 struct coff_link_hash_entry * h)
1838 {
1839 const char * name = h->root.root.string;
1840 asection * s;
1841 char * tmp_name;
1842 struct coff_link_hash_entry * myh;
1843 struct bfd_link_hash_entry * bh;
1844 struct coff_arm_link_hash_table * globals;
1845 bfd_vma val;
1846 bfd_size_type amt;
1847
1848 globals = coff_arm_hash_table (info);
1849
1850 BFD_ASSERT (globals != NULL);
1851 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1852
1853 s = bfd_get_section_by_name
1854 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1855
1856 BFD_ASSERT (s != NULL);
1857
1858 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1859 tmp_name = bfd_malloc (amt);
1860
1861 BFD_ASSERT (tmp_name);
1862
1863 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1864
1865 myh = coff_link_hash_lookup
1866 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1867
1868 if (myh != NULL)
1869 {
1870 free (tmp_name);
1871 /* We've already seen this guy. */
1872 return;
1873 }
1874
1875 bh = NULL;
1876 val = globals->thumb_glue_size + 1;
1877 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1878 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1879
1880 /* If we mark it 'thumb', the disassembler will do a better job. */
1881 myh = (struct coff_link_hash_entry *) bh;
1882 myh->class = C_THUMBEXTFUNC;
1883
1884 free (tmp_name);
1885
1886 /* Allocate another symbol to mark where we switch to arm mode. */
1887
1888 #define CHANGE_TO_ARM "__%s_change_to_arm"
1889 #define BACK_FROM_ARM "__%s_back_from_arm"
1890
1891 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1892 tmp_name = bfd_malloc (amt);
1893
1894 BFD_ASSERT (tmp_name);
1895
1896 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1897
1898 bh = NULL;
1899 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1900 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1901 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1902
1903 free (tmp_name);
1904
1905 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1906
1907 return;
1908 }
1909 #endif /* not ARM_WINCE */
1910
1911 /* Select a BFD to be used to hold the sections used by the glue code.
1912 This function is called from the linker scripts in ld/emultempl/
1913 {armcoff/pe}.em */
1914
1915 bfd_boolean
bfd_arm_get_bfd_for_interworking(bfd * abfd,struct bfd_link_info * info)1916 bfd_arm_get_bfd_for_interworking (bfd * abfd,
1917 struct bfd_link_info * info)
1918 {
1919 struct coff_arm_link_hash_table * globals;
1920 flagword flags;
1921 asection * sec;
1922
1923 /* If we are only performing a partial link do not bother
1924 getting a bfd to hold the glue. */
1925 if (info->relocatable)
1926 return TRUE;
1927
1928 globals = coff_arm_hash_table (info);
1929
1930 BFD_ASSERT (globals != NULL);
1931
1932 if (globals->bfd_of_glue_owner != NULL)
1933 return TRUE;
1934
1935 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1936
1937 if (sec == NULL)
1938 {
1939 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1940
1941 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1942
1943 if (sec == NULL
1944 || ! bfd_set_section_flags (abfd, sec, flags)
1945 || ! bfd_set_section_alignment (abfd, sec, 2))
1946 return FALSE;
1947 }
1948
1949 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1950
1951 if (sec == NULL)
1952 {
1953 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1954
1955 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1956
1957 if (sec == NULL
1958 || ! bfd_set_section_flags (abfd, sec, flags)
1959 || ! bfd_set_section_alignment (abfd, sec, 2))
1960 return FALSE;
1961 }
1962
1963 /* Save the bfd for later use. */
1964 globals->bfd_of_glue_owner = abfd;
1965
1966 return TRUE;
1967 }
1968
1969 bfd_boolean
bfd_arm_process_before_allocation(bfd * abfd,struct bfd_link_info * info,int support_old_code)1970 bfd_arm_process_before_allocation (bfd * abfd,
1971 struct bfd_link_info * info,
1972 int support_old_code)
1973 {
1974 asection * sec;
1975 struct coff_arm_link_hash_table * globals;
1976
1977 /* If we are only performing a partial link do not bother
1978 to construct any glue. */
1979 if (info->relocatable)
1980 return TRUE;
1981
1982 /* Here we have a bfd that is to be included on the link. We have a hook
1983 to do reloc rummaging, before section sizes are nailed down. */
1984 _bfd_coff_get_external_symbols (abfd);
1985
1986 globals = coff_arm_hash_table (info);
1987
1988 BFD_ASSERT (globals != NULL);
1989 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1990
1991 globals->support_old_code = support_old_code;
1992
1993 /* Rummage around all the relocs and map the glue vectors. */
1994 sec = abfd->sections;
1995
1996 if (sec == NULL)
1997 return TRUE;
1998
1999 for (; sec != NULL; sec = sec->next)
2000 {
2001 struct internal_reloc * i;
2002 struct internal_reloc * rel;
2003
2004 if (sec->reloc_count == 0)
2005 continue;
2006
2007 /* Load the relocs. */
2008 /* FIXME: there may be a storage leak here. */
2009 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2010
2011 BFD_ASSERT (i != 0);
2012
2013 for (rel = i; rel < i + sec->reloc_count; ++rel)
2014 {
2015 unsigned short r_type = rel->r_type;
2016 long symndx;
2017 struct coff_link_hash_entry * h;
2018
2019 symndx = rel->r_symndx;
2020
2021 /* If the relocation is not against a symbol it cannot concern us. */
2022 if (symndx == -1)
2023 continue;
2024
2025 /* If the index is outside of the range of our table, something has gone wrong. */
2026 if (symndx >= obj_conv_table_size (abfd))
2027 {
2028 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2029 abfd, symndx);
2030 continue;
2031 }
2032
2033 h = obj_coff_sym_hashes (abfd)[symndx];
2034
2035 /* If the relocation is against a static symbol it must be within
2036 the current section and so cannot be a cross ARM/Thumb relocation. */
2037 if (h == NULL)
2038 continue;
2039
2040 switch (r_type)
2041 {
2042 case ARM_26:
2043 /* This one is a call from arm code. We need to look up
2044 the target of the call. If it is a thumb target, we
2045 insert glue. */
2046
2047 if (h->class == C_THUMBEXTFUNC)
2048 record_arm_to_thumb_glue (info, h);
2049 break;
2050
2051 #ifndef ARM_WINCE
2052 case ARM_THUMB23:
2053 /* This one is a call from thumb code. We used to look
2054 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2055 up the target of the call. If it is an arm target, we
2056 insert glue. If the symbol does not exist it will be
2057 given a class of C_EXT and so we will generate a stub
2058 for it. This is not really a problem, since the link
2059 is doomed anyway. */
2060
2061 switch (h->class)
2062 {
2063 case C_EXT:
2064 case C_STAT:
2065 case C_LABEL:
2066 record_thumb_to_arm_glue (info, h);
2067 break;
2068 default:
2069 ;
2070 }
2071 break;
2072 #endif
2073
2074 default:
2075 break;
2076 }
2077 }
2078 }
2079
2080 return TRUE;
2081 }
2082
2083 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2084
2085 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2086 #define coff_relocate_section coff_arm_relocate_section
2087 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2088 #define coff_adjust_symndx coff_arm_adjust_symndx
2089 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2090 #define coff_final_link_postscript coff_arm_final_link_postscript
2091 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2092 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2093 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2094 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2095 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2096
2097 /* When doing a relocatable link, we want to convert ARM_26 relocs
2098 into ARM_26D relocs. */
2099
2100 static bfd_boolean
coff_arm_adjust_symndx(bfd * obfd ATTRIBUTE_UNUSED,struct bfd_link_info * info ATTRIBUTE_UNUSED,bfd * ibfd,asection * sec,struct internal_reloc * irel,bfd_boolean * adjustedp)2101 coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
2102 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2103 bfd *ibfd,
2104 asection *sec,
2105 struct internal_reloc *irel,
2106 bfd_boolean *adjustedp)
2107 {
2108 if (irel->r_type == ARM_26)
2109 {
2110 struct coff_link_hash_entry *h;
2111
2112 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2113 if (h != NULL
2114 && (h->root.type == bfd_link_hash_defined
2115 || h->root.type == bfd_link_hash_defweak)
2116 && h->root.u.def.section->output_section == sec->output_section)
2117 irel->r_type = ARM_26D;
2118 }
2119 *adjustedp = FALSE;
2120 return TRUE;
2121 }
2122
2123 /* Called when merging the private data areas of two BFDs.
2124 This is important as it allows us to detect if we are
2125 attempting to merge binaries compiled for different ARM
2126 targets, eg different CPUs or different APCS's. */
2127
2128 static bfd_boolean
coff_arm_merge_private_bfd_data(bfd * ibfd,bfd * obfd)2129 coff_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
2130 {
2131 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2132
2133 if (ibfd == obfd)
2134 return TRUE;
2135
2136 /* If the two formats are different we cannot merge anything.
2137 This is not an error, since it is permissable to change the
2138 input and output formats. */
2139 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2140 || obfd->xvec->flavour != bfd_target_coff_flavour)
2141 return TRUE;
2142
2143 /* Determine what should happen if the input ARM architecture
2144 does not match the output ARM architecture. */
2145 if (! bfd_arm_merge_machines (ibfd, obfd))
2146 return FALSE;
2147
2148 /* Verify that the APCS is the same for the two BFDs. */
2149 if (APCS_SET (ibfd))
2150 {
2151 if (APCS_SET (obfd))
2152 {
2153 /* If the src and dest have different APCS flag bits set, fail. */
2154 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2155 {
2156 _bfd_error_handler
2157 /* xgettext: c-format */
2158 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2159 ibfd, obfd,
2160 APCS_26_FLAG (ibfd) ? 26 : 32,
2161 APCS_26_FLAG (obfd) ? 26 : 32
2162 );
2163
2164 bfd_set_error (bfd_error_wrong_format);
2165 return FALSE;
2166 }
2167
2168 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2169 {
2170 const char *msg;
2171
2172 if (APCS_FLOAT_FLAG (ibfd))
2173 /* xgettext: c-format */
2174 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2175 else
2176 /* xgettext: c-format */
2177 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2178
2179 _bfd_error_handler (msg, ibfd, obfd);
2180
2181 bfd_set_error (bfd_error_wrong_format);
2182 return FALSE;
2183 }
2184
2185 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2186 {
2187 const char * msg;
2188
2189 if (PIC_FLAG (ibfd))
2190 /* xgettext: c-format */
2191 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2192 else
2193 /* xgettext: c-format */
2194 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2195 _bfd_error_handler (msg, ibfd, obfd);
2196
2197 bfd_set_error (bfd_error_wrong_format);
2198 return FALSE;
2199 }
2200 }
2201 else
2202 {
2203 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2204
2205 /* Set up the arch and fields as well as these are probably wrong. */
2206 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2207 }
2208 }
2209
2210 /* Check the interworking support. */
2211 if (INTERWORK_SET (ibfd))
2212 {
2213 if (INTERWORK_SET (obfd))
2214 {
2215 /* If the src and dest differ in their interworking issue a warning. */
2216 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2217 {
2218 const char * msg;
2219
2220 if (INTERWORK_FLAG (ibfd))
2221 /* xgettext: c-format */
2222 msg = _("Warning: %B supports interworking, whereas %B does not");
2223 else
2224 /* xgettext: c-format */
2225 msg = _("Warning: %B does not support interworking, whereas %B does");
2226
2227 _bfd_error_handler (msg, ibfd, obfd);
2228 }
2229 }
2230 else
2231 {
2232 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2233 }
2234 }
2235
2236 return TRUE;
2237 }
2238
2239 /* Display the flags field. */
2240
2241 static bfd_boolean
coff_arm_print_private_bfd_data(bfd * abfd,void * ptr)2242 coff_arm_print_private_bfd_data (bfd * abfd, void * ptr)
2243 {
2244 FILE * file = (FILE *) ptr;
2245
2246 BFD_ASSERT (abfd != NULL && ptr != NULL);
2247
2248 /* xgettext:c-format */
2249 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2250
2251 if (APCS_SET (abfd))
2252 {
2253 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2254 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2255
2256 if (APCS_FLOAT_FLAG (abfd))
2257 fprintf (file, _(" [floats passed in float registers]"));
2258 else
2259 fprintf (file, _(" [floats passed in integer registers]"));
2260
2261 if (PIC_FLAG (abfd))
2262 fprintf (file, _(" [position independent]"));
2263 else
2264 fprintf (file, _(" [absolute position]"));
2265 }
2266
2267 if (! INTERWORK_SET (abfd))
2268 fprintf (file, _(" [interworking flag not initialised]"));
2269 else if (INTERWORK_FLAG (abfd))
2270 fprintf (file, _(" [interworking supported]"));
2271 else
2272 fprintf (file, _(" [interworking not supported]"));
2273
2274 fputc ('\n', file);
2275
2276 return TRUE;
2277 }
2278
2279 /* Copies the given flags into the coff_tdata.flags field.
2280 Typically these flags come from the f_flags[] field of
2281 the COFF filehdr structure, which contains important,
2282 target specific information.
2283 Note: Although this function is static, it is explicitly
2284 called from both coffcode.h and peicode.h. */
2285
2286 static bfd_boolean
_bfd_coff_arm_set_private_flags(bfd * abfd,flagword flags)2287 _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags)
2288 {
2289 flagword flag;
2290
2291 BFD_ASSERT (abfd != NULL);
2292
2293 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2294
2295 /* Make sure that the APCS field has not been initialised to the opposite
2296 value. */
2297 if (APCS_SET (abfd)
2298 && ( (APCS_26_FLAG (abfd) != flag)
2299 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2300 || (PIC_FLAG (abfd) != (flags & F_PIC))
2301 ))
2302 return FALSE;
2303
2304 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2305
2306 SET_APCS_FLAGS (abfd, flag);
2307
2308 flag = (flags & F_INTERWORK);
2309
2310 /* If the BFD has already had its interworking flag set, but it
2311 is different from the value that we have been asked to set,
2312 then assume that that merged code will not support interworking
2313 and set the flag accordingly. */
2314 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2315 {
2316 if (flag)
2317 /* xgettext: c-format */
2318 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2319 abfd);
2320 else
2321 /* xgettext: c-format */
2322 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2323 abfd);
2324 flag = 0;
2325 }
2326
2327 SET_INTERWORK_FLAG (abfd, flag);
2328
2329 return TRUE;
2330 }
2331
2332 /* Copy the important parts of the target specific data
2333 from one instance of a BFD to another. */
2334
2335 static bfd_boolean
coff_arm_copy_private_bfd_data(bfd * src,bfd * dest)2336 coff_arm_copy_private_bfd_data (bfd * src, bfd * dest)
2337 {
2338 BFD_ASSERT (src != NULL && dest != NULL);
2339
2340 if (src == dest)
2341 return TRUE;
2342
2343 /* If the destination is not in the same format as the source, do not do
2344 the copy. */
2345 if (src->xvec != dest->xvec)
2346 return TRUE;
2347
2348 /* Copy the flags field. */
2349 if (APCS_SET (src))
2350 {
2351 if (APCS_SET (dest))
2352 {
2353 /* If the src and dest have different APCS flag bits set, fail. */
2354 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2355 return FALSE;
2356
2357 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2358 return FALSE;
2359
2360 if (PIC_FLAG (dest) != PIC_FLAG (src))
2361 return FALSE;
2362 }
2363 else
2364 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2365 | PIC_FLAG (src));
2366 }
2367
2368 if (INTERWORK_SET (src))
2369 {
2370 if (INTERWORK_SET (dest))
2371 {
2372 /* If the src and dest have different interworking flags then turn
2373 off the interworking bit. */
2374 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2375 {
2376 if (INTERWORK_FLAG (dest))
2377 {
2378 /* xgettext:c-format */
2379 _bfd_error_handler (("\
2380 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2381 dest, src);
2382 }
2383
2384 SET_INTERWORK_FLAG (dest, 0);
2385 }
2386 }
2387 else
2388 {
2389 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2390 }
2391 }
2392
2393 return TRUE;
2394 }
2395
2396 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2397 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2398 #define LOCAL_LABEL_PREFIX ""
2399 #ifndef USER_LABEL_PREFIX
2400 #define USER_LABEL_PREFIX "_"
2401 #endif
2402
2403 /* Like _bfd_coff_is_local_label_name, but
2404 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2405 non-local.
2406 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2407 labels of the form Lxxx to be stripped. */
2408
2409 static bfd_boolean
coff_arm_is_local_label_name(bfd * abfd ATTRIBUTE_UNUSED,const char * name)2410 coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
2411 const char * name)
2412 {
2413 #ifdef USER_LABEL_PREFIX
2414 if (USER_LABEL_PREFIX[0] != 0)
2415 {
2416 size_t len = strlen (USER_LABEL_PREFIX);
2417
2418 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2419 return FALSE;
2420 }
2421 #endif
2422
2423 #ifdef LOCAL_LABEL_PREFIX
2424 /* If there is a prefix for local labels then look for this.
2425 If the prefix exists, but it is empty, then ignore the test. */
2426
2427 if (LOCAL_LABEL_PREFIX[0] != 0)
2428 {
2429 size_t len = strlen (LOCAL_LABEL_PREFIX);
2430
2431 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2432 return FALSE;
2433
2434 /* Perform the checks below for the rest of the name. */
2435 name += len;
2436 }
2437 #endif
2438
2439 return name[0] == 'L';
2440 }
2441
2442 /* This piece of machinery exists only to guarantee that the bfd that holds
2443 the glue section is written last.
2444
2445 This does depend on bfd_make_section attaching a new section to the
2446 end of the section list for the bfd. */
2447
2448 static bfd_boolean
coff_arm_link_output_has_begun(bfd * sub,struct coff_final_link_info * info)2449 coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info)
2450 {
2451 return (sub->output_has_begun
2452 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2453 }
2454
2455 static bfd_boolean
coff_arm_final_link_postscript(bfd * abfd ATTRIBUTE_UNUSED,struct coff_final_link_info * pfinfo)2456 coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED,
2457 struct coff_final_link_info * pfinfo)
2458 {
2459 struct coff_arm_link_hash_table * globals;
2460
2461 globals = coff_arm_hash_table (pfinfo->info);
2462
2463 BFD_ASSERT (globals != NULL);
2464
2465 if (globals->bfd_of_glue_owner != NULL)
2466 {
2467 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2468 return FALSE;
2469
2470 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2471 }
2472
2473 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2474 }
2475
2476 #include "coffcode.h"
2477
2478 #ifndef TARGET_LITTLE_SYM
2479 #define TARGET_LITTLE_SYM armcoff_little_vec
2480 #endif
2481 #ifndef TARGET_LITTLE_NAME
2482 #define TARGET_LITTLE_NAME "coff-arm-little"
2483 #endif
2484 #ifndef TARGET_BIG_SYM
2485 #define TARGET_BIG_SYM armcoff_big_vec
2486 #endif
2487 #ifndef TARGET_BIG_NAME
2488 #define TARGET_BIG_NAME "coff-arm-big"
2489 #endif
2490
2491 #ifndef TARGET_UNDERSCORE
2492 #define TARGET_UNDERSCORE 0
2493 #endif
2494
2495 #ifndef EXTRA_S_FLAGS
2496 #ifdef COFF_WITH_PE
2497 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2498 #else
2499 #define EXTRA_S_FLAGS SEC_CODE
2500 #endif
2501 #endif
2502
2503 /* Forward declaration for use initialising alternative_target field. */
2504 extern const bfd_target TARGET_BIG_SYM ;
2505
2506 /* Target vectors. */
2507 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2508 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)
2509