1 /* BFD back-end for ARM COFF files.
2 Copyright (C) 1990-2021 Free Software Foundation, Inc.
3 Written by Cygnus Support.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "coff/arm.h"
26 #include "coff/internal.h"
27 #include "cpu-arm.h"
28 #include "coff-arm.h"
29
30 #ifdef COFF_WITH_PE
31 #include "coff/pe.h"
32 #endif
33
34 #include "libcoff.h"
35
36 /* All users of this file have bfd_octets_per_byte (abfd, sec) == 1. */
37 #define OCTETS_PER_BYTE(ABFD, SEC) 1
38
39 /* Macros for manipulation the bits in the flags field of the coff data
40 structure. */
41 #define APCS_26_FLAG(abfd) \
42 (coff_data (abfd)->flags & F_APCS_26)
43
44 #define APCS_FLOAT_FLAG(abfd) \
45 (coff_data (abfd)->flags & F_APCS_FLOAT)
46
47 #define PIC_FLAG(abfd) \
48 (coff_data (abfd)->flags & F_PIC)
49
50 #define APCS_SET(abfd) \
51 (coff_data (abfd)->flags & F_APCS_SET)
52
53 #define SET_APCS_FLAGS(abfd, flgs) \
54 do \
55 { \
56 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
57 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
58 } \
59 while (0)
60
61 #define INTERWORK_FLAG(abfd) \
62 (coff_data (abfd)->flags & F_INTERWORK)
63
64 #define INTERWORK_SET(abfd) \
65 (coff_data (abfd)->flags & F_INTERWORK_SET)
66
67 #define SET_INTERWORK_FLAG(abfd, flg) \
68 do \
69 { \
70 coff_data (abfd)->flags &= ~F_INTERWORK; \
71 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
72 } \
73 while (0)
74
75 #ifndef NUM_ELEM
76 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
77 #endif
78
79 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
80 /* Some typedefs for holding instructions. */
81 typedef unsigned long int insn32;
82 typedef unsigned short int insn16;
83
84 /* The linker script knows the section names for placement.
85 The entry_names are used to do simple name mangling on the stubs.
86 Given a function name, and its type, the stub can be found. The
87 name can be changed. The only requirement is the %s be present. */
88
89 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
90 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
91
92 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
93 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
94
95 /* Used by the assembler. */
96
97 static bfd_reloc_status_type
coff_arm_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol ATTRIBUTE_UNUSED,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)98 coff_arm_reloc (bfd *abfd,
99 arelent *reloc_entry,
100 asymbol *symbol ATTRIBUTE_UNUSED,
101 void * data,
102 asection *input_section,
103 bfd *output_bfd,
104 char **error_message ATTRIBUTE_UNUSED)
105 {
106 symvalue diff;
107
108 if (output_bfd == NULL)
109 return bfd_reloc_continue;
110
111 diff = reloc_entry->addend;
112
113 #define DOIT(x) \
114 x = ((x & ~howto->dst_mask) \
115 | (((x & howto->src_mask) + diff) & howto->dst_mask))
116
117 if (diff != 0)
118 {
119 reloc_howto_type *howto = reloc_entry->howto;
120 bfd_size_type octets = (reloc_entry->address
121 * OCTETS_PER_BYTE (abfd, input_section));
122 unsigned char *addr = (unsigned char *) data + octets;
123
124 if (!bfd_reloc_offset_in_range (howto, abfd, input_section, octets))
125 return bfd_reloc_outofrange;
126
127 switch (howto->size)
128 {
129 case 0:
130 {
131 char x = bfd_get_8 (abfd, addr);
132 DOIT (x);
133 bfd_put_8 (abfd, x, addr);
134 }
135 break;
136
137 case 1:
138 {
139 short x = bfd_get_16 (abfd, addr);
140 DOIT (x);
141 bfd_put_16 (abfd, (bfd_vma) x, addr);
142 }
143 break;
144
145 case 2:
146 {
147 long x = bfd_get_32 (abfd, addr);
148 DOIT (x);
149 bfd_put_32 (abfd, (bfd_vma) x, addr);
150 }
151 break;
152
153 default:
154 abort ();
155 }
156 }
157
158 /* Now let bfd_perform_relocation finish everything up. */
159 return bfd_reloc_continue;
160 }
161
162 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
163 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
164 should not. */
165 #ifndef TARGET_UNDERSCORE
166 #define TARGET_UNDERSCORE '_'
167 #endif
168
169 #ifndef PCRELOFFSET
170 #define PCRELOFFSET true
171 #endif
172
173 /* These most certainly belong somewhere else. Just had to get rid of
174 the manifest constants in the code. */
175
176 #ifdef ARM_WINCE
177
178 #define ARM_26D 0
179 #define ARM_32 1
180 #define ARM_RVA32 2
181 #define ARM_26 3
182 #define ARM_THUMB12 4
183 #define ARM_SECTION 14
184 #define ARM_SECREL 15
185
186 #else
187
188 #define ARM_8 0
189 #define ARM_16 1
190 #define ARM_32 2
191 #define ARM_26 3
192 #define ARM_DISP8 4
193 #define ARM_DISP16 5
194 #define ARM_DISP32 6
195 #define ARM_26D 7
196 /* 8 is unused. */
197 #define ARM_NEG16 9
198 #define ARM_NEG32 10
199 #define ARM_RVA32 11
200 #define ARM_THUMB9 12
201 #define ARM_THUMB12 13
202 #define ARM_THUMB23 14
203
204 #endif
205
206 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
207 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
208 static bfd_reloc_status_type aoutarm_fix_pcrel_26
209 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
210 static bfd_reloc_status_type coff_thumb_pcrel_12
211 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
212 #ifndef ARM_WINCE
213 static bfd_reloc_status_type coff_thumb_pcrel_9
214 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
215 static bfd_reloc_status_type coff_thumb_pcrel_23
216 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
217 #endif
218
219 static reloc_howto_type aoutarm_std_reloc_howto[] =
220 {
221 #ifdef ARM_WINCE
222 HOWTO (ARM_26D,
223 2,
224 2,
225 24,
226 true,
227 0,
228 complain_overflow_dont,
229 aoutarm_fix_pcrel_26_done,
230 "ARM_26D",
231 true, /* partial_inplace. */
232 0x00ffffff,
233 0x0,
234 PCRELOFFSET),
235 HOWTO (ARM_32,
236 0,
237 2,
238 32,
239 false,
240 0,
241 complain_overflow_bitfield,
242 coff_arm_reloc,
243 "ARM_32",
244 true, /* partial_inplace. */
245 0xffffffff,
246 0xffffffff,
247 PCRELOFFSET),
248 HOWTO (ARM_RVA32,
249 0,
250 2,
251 32,
252 false,
253 0,
254 complain_overflow_bitfield,
255 coff_arm_reloc,
256 "ARM_RVA32",
257 true, /* partial_inplace. */
258 0xffffffff,
259 0xffffffff,
260 PCRELOFFSET),
261 HOWTO (ARM_26,
262 2,
263 2,
264 24,
265 true,
266 0,
267 complain_overflow_signed,
268 aoutarm_fix_pcrel_26 ,
269 "ARM_26",
270 false,
271 0x00ffffff,
272 0x00ffffff,
273 PCRELOFFSET),
274 HOWTO (ARM_THUMB12,
275 1,
276 1,
277 11,
278 true,
279 0,
280 complain_overflow_signed,
281 coff_thumb_pcrel_12 ,
282 "ARM_THUMB12",
283 false,
284 0x000007ff,
285 0x000007ff,
286 PCRELOFFSET),
287 EMPTY_HOWTO (-1),
288 EMPTY_HOWTO (-1),
289 EMPTY_HOWTO (-1),
290 EMPTY_HOWTO (-1),
291 EMPTY_HOWTO (-1),
292 EMPTY_HOWTO (-1),
293 EMPTY_HOWTO (-1),
294 EMPTY_HOWTO (-1),
295 EMPTY_HOWTO (-1),
296 HOWTO (ARM_SECTION,
297 0,
298 1,
299 16,
300 false,
301 0,
302 complain_overflow_bitfield,
303 coff_arm_reloc,
304 "ARM_SECTION",
305 true, /* partial_inplace. */
306 0x0000ffff,
307 0x0000ffff,
308 PCRELOFFSET),
309 HOWTO (ARM_SECREL,
310 0,
311 2,
312 32,
313 false,
314 0,
315 complain_overflow_bitfield,
316 coff_arm_reloc,
317 "ARM_SECREL",
318 true, /* partial_inplace. */
319 0xffffffff,
320 0xffffffff,
321 PCRELOFFSET),
322 #else /* not ARM_WINCE */
323 HOWTO (ARM_8,
324 0,
325 0,
326 8,
327 false,
328 0,
329 complain_overflow_bitfield,
330 coff_arm_reloc,
331 "ARM_8",
332 true,
333 0x000000ff,
334 0x000000ff,
335 PCRELOFFSET),
336 HOWTO (ARM_16,
337 0,
338 1,
339 16,
340 false,
341 0,
342 complain_overflow_bitfield,
343 coff_arm_reloc,
344 "ARM_16",
345 true,
346 0x0000ffff,
347 0x0000ffff,
348 PCRELOFFSET),
349 HOWTO (ARM_32,
350 0,
351 2,
352 32,
353 false,
354 0,
355 complain_overflow_bitfield,
356 coff_arm_reloc,
357 "ARM_32",
358 true,
359 0xffffffff,
360 0xffffffff,
361 PCRELOFFSET),
362 HOWTO (ARM_26,
363 2,
364 2,
365 24,
366 true,
367 0,
368 complain_overflow_signed,
369 aoutarm_fix_pcrel_26 ,
370 "ARM_26",
371 false,
372 0x00ffffff,
373 0x00ffffff,
374 PCRELOFFSET),
375 HOWTO (ARM_DISP8,
376 0,
377 0,
378 8,
379 true,
380 0,
381 complain_overflow_signed,
382 coff_arm_reloc,
383 "ARM_DISP8",
384 true,
385 0x000000ff,
386 0x000000ff,
387 true),
388 HOWTO (ARM_DISP16,
389 0,
390 1,
391 16,
392 true,
393 0,
394 complain_overflow_signed,
395 coff_arm_reloc,
396 "ARM_DISP16",
397 true,
398 0x0000ffff,
399 0x0000ffff,
400 true),
401 HOWTO (ARM_DISP32,
402 0,
403 2,
404 32,
405 true,
406 0,
407 complain_overflow_signed,
408 coff_arm_reloc,
409 "ARM_DISP32",
410 true,
411 0xffffffff,
412 0xffffffff,
413 true),
414 HOWTO (ARM_26D,
415 2,
416 2,
417 24,
418 false,
419 0,
420 complain_overflow_dont,
421 aoutarm_fix_pcrel_26_done,
422 "ARM_26D",
423 true,
424 0x00ffffff,
425 0x0,
426 false),
427 /* 8 is unused */
428 EMPTY_HOWTO (-1),
429 HOWTO (ARM_NEG16,
430 0,
431 -1,
432 16,
433 false,
434 0,
435 complain_overflow_bitfield,
436 coff_arm_reloc,
437 "ARM_NEG16",
438 true,
439 0x0000ffff,
440 0x0000ffff,
441 false),
442 HOWTO (ARM_NEG32,
443 0,
444 -2,
445 32,
446 false,
447 0,
448 complain_overflow_bitfield,
449 coff_arm_reloc,
450 "ARM_NEG32",
451 true,
452 0xffffffff,
453 0xffffffff,
454 false),
455 HOWTO (ARM_RVA32,
456 0,
457 2,
458 32,
459 false,
460 0,
461 complain_overflow_bitfield,
462 coff_arm_reloc,
463 "ARM_RVA32",
464 true,
465 0xffffffff,
466 0xffffffff,
467 PCRELOFFSET),
468 HOWTO (ARM_THUMB9,
469 1,
470 1,
471 8,
472 true,
473 0,
474 complain_overflow_signed,
475 coff_thumb_pcrel_9 ,
476 "ARM_THUMB9",
477 false,
478 0x000000ff,
479 0x000000ff,
480 PCRELOFFSET),
481 HOWTO (ARM_THUMB12,
482 1,
483 1,
484 11,
485 true,
486 0,
487 complain_overflow_signed,
488 coff_thumb_pcrel_12 ,
489 "ARM_THUMB12",
490 false,
491 0x000007ff,
492 0x000007ff,
493 PCRELOFFSET),
494 HOWTO (ARM_THUMB23,
495 1,
496 2,
497 22,
498 true,
499 0,
500 complain_overflow_signed,
501 coff_thumb_pcrel_23 ,
502 "ARM_THUMB23",
503 false,
504 0x07ff07ff,
505 0x07ff07ff,
506 PCRELOFFSET)
507 #endif /* not ARM_WINCE */
508 };
509
510 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
511
512 #ifdef COFF_WITH_PE
513 /* Return TRUE if this relocation should
514 appear in the output .reloc section. */
515
516 static bool
in_reloc_p(bfd * abfd ATTRIBUTE_UNUSED,reloc_howto_type * howto)517 in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED,
518 reloc_howto_type * howto)
519 {
520 return !howto->pc_relative && howto->type != ARM_RVA32;
521 }
522 #endif
523
524 #define RTYPE2HOWTO(cache_ptr, dst) \
525 (cache_ptr)->howto = \
526 (dst)->r_type < NUM_RELOCS \
527 ? aoutarm_std_reloc_howto + (dst)->r_type \
528 : NULL
529
530 #define coff_rtype_to_howto coff_arm_rtype_to_howto
531
532 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)533 coff_arm_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
534 asection *sec,
535 struct internal_reloc *rel,
536 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED,
537 struct internal_syment *sym ATTRIBUTE_UNUSED,
538 bfd_vma *addendp)
539 {
540 reloc_howto_type * howto;
541
542 if (rel->r_type >= NUM_RELOCS)
543 return NULL;
544
545 howto = aoutarm_std_reloc_howto + rel->r_type;
546
547 if (rel->r_type == ARM_RVA32)
548 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
549
550 #if defined COFF_WITH_PE && defined ARM_WINCE
551 if (rel->r_type == ARM_SECREL)
552 {
553 bfd_vma osect_vma;
554
555 if (h && (h->type == bfd_link_hash_defined
556 || h->type == bfd_link_hash_defweak))
557 osect_vma = h->root.u.def.section->output_section->vma;
558 else
559 {
560 int i;
561
562 /* Sigh, the only way to get the section to offset against
563 is to find it the hard way. */
564
565 for (sec = abfd->sections, i = 1; i < sym->n_scnum; i++)
566 sec = sec->next;
567
568 osect_vma = sec->output_section->vma;
569 }
570
571 *addendp -= osect_vma;
572 }
573 #endif
574
575 return howto;
576 }
577
578 /* Used by the assembler. */
579
580 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)581 aoutarm_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED,
582 arelent *reloc_entry ATTRIBUTE_UNUSED,
583 asymbol *symbol ATTRIBUTE_UNUSED,
584 void * data ATTRIBUTE_UNUSED,
585 asection *input_section ATTRIBUTE_UNUSED,
586 bfd *output_bfd ATTRIBUTE_UNUSED,
587 char **error_message ATTRIBUTE_UNUSED)
588 {
589 /* This is dead simple at present. */
590 return bfd_reloc_ok;
591 }
592
593 /* Used by the assembler. */
594
595 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)596 aoutarm_fix_pcrel_26 (bfd *abfd,
597 arelent *reloc_entry,
598 asymbol *symbol,
599 void * data,
600 asection *input_section,
601 bfd *output_bfd,
602 char **error_message ATTRIBUTE_UNUSED)
603 {
604 bfd_vma relocation;
605 bfd_size_type addr = reloc_entry->address;
606 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
607 bfd_reloc_status_type flag = bfd_reloc_ok;
608
609 /* If this is an undefined symbol, return error. */
610 if (bfd_is_und_section (symbol->section)
611 && (symbol->flags & BSF_WEAK) == 0)
612 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
613
614 /* If the sections are different, and we are doing a partial relocation,
615 just ignore it for now. */
616 if (symbol->section->name != input_section->name
617 && output_bfd != (bfd *)NULL)
618 return bfd_reloc_continue;
619
620 relocation = (target & 0x00ffffff) << 2;
621 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
622 relocation += symbol->value;
623 relocation += symbol->section->output_section->vma;
624 relocation += symbol->section->output_offset;
625 relocation += reloc_entry->addend;
626 relocation -= input_section->output_section->vma;
627 relocation -= input_section->output_offset;
628 relocation -= addr;
629
630 if (relocation & 3)
631 return bfd_reloc_overflow;
632
633 /* Check for overflow. */
634 if (relocation & 0x02000000)
635 {
636 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
637 flag = bfd_reloc_overflow;
638 }
639 else if (relocation & ~(bfd_vma) 0x03ffffff)
640 flag = bfd_reloc_overflow;
641
642 target &= ~0x00ffffff;
643 target |= (relocation >> 2) & 0x00ffffff;
644 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
645
646 /* Now the ARM magic... Change the reloc type so that it is marked as done.
647 Strictly this is only necessary if we are doing a partial relocation. */
648 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
649
650 return flag;
651 }
652
653 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)654 coff_thumb_pcrel_common (bfd *abfd,
655 arelent *reloc_entry,
656 asymbol *symbol,
657 void * data,
658 asection *input_section,
659 bfd *output_bfd,
660 char **error_message ATTRIBUTE_UNUSED,
661 thumb_pcrel_branchtype btype)
662 {
663 bfd_vma relocation = 0;
664 bfd_size_type addr = reloc_entry->address;
665 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
666 bfd_reloc_status_type flag = bfd_reloc_ok;
667 bfd_vma dstmsk;
668 bfd_vma offmsk;
669 bfd_vma signbit;
670
671 /* NOTE: This routine is currently used by GAS, but not by the link
672 phase. */
673 switch (btype)
674 {
675 case b9:
676 dstmsk = 0x000000ff;
677 offmsk = 0x000001fe;
678 signbit = 0x00000100;
679 break;
680
681 case b12:
682 dstmsk = 0x000007ff;
683 offmsk = 0x00000ffe;
684 signbit = 0x00000800;
685 break;
686
687 case b23:
688 dstmsk = 0x07ff07ff;
689 offmsk = 0x007fffff;
690 signbit = 0x00400000;
691 break;
692
693 default:
694 abort ();
695 }
696
697 /* If this is an undefined symbol, return error. */
698 if (bfd_is_und_section (symbol->section)
699 && (symbol->flags & BSF_WEAK) == 0)
700 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
701
702 /* If the sections are different, and we are doing a partial relocation,
703 just ignore it for now. */
704 if (symbol->section->name != input_section->name
705 && output_bfd != (bfd *)NULL)
706 return bfd_reloc_continue;
707
708 switch (btype)
709 {
710 case b9:
711 case b12:
712 relocation = ((target & dstmsk) << 1);
713 break;
714
715 case b23:
716 if (bfd_big_endian (abfd))
717 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
718 else
719 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
720 break;
721
722 default:
723 abort ();
724 }
725
726 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
727 relocation += symbol->value;
728 relocation += symbol->section->output_section->vma;
729 relocation += symbol->section->output_offset;
730 relocation += reloc_entry->addend;
731 relocation -= input_section->output_section->vma;
732 relocation -= input_section->output_offset;
733 relocation -= addr;
734
735 if (relocation & 1)
736 return bfd_reloc_overflow;
737
738 /* Check for overflow. */
739 if (relocation & signbit)
740 {
741 if ((relocation & ~offmsk) != ~offmsk)
742 flag = bfd_reloc_overflow;
743 }
744 else if (relocation & ~offmsk)
745 flag = bfd_reloc_overflow;
746
747 target &= ~dstmsk;
748 switch (btype)
749 {
750 case b9:
751 case b12:
752 target |= (relocation >> 1);
753 break;
754
755 case b23:
756 if (bfd_big_endian (abfd))
757 target |= (((relocation & 0xfff) >> 1)
758 | ((relocation << 4) & 0x07ff0000));
759 else
760 target |= (((relocation & 0xffe) << 15)
761 | ((relocation >> 12) & 0x7ff));
762 break;
763
764 default:
765 abort ();
766 }
767
768 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
769
770 /* Now the ARM magic... Change the reloc type so that it is marked as done.
771 Strictly this is only necessary if we are doing a partial relocation. */
772 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
773
774 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
775 return flag;
776 }
777
778 #ifndef ARM_WINCE
779 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)780 coff_thumb_pcrel_23 (bfd *abfd,
781 arelent *reloc_entry,
782 asymbol *symbol,
783 void * data,
784 asection *input_section,
785 bfd *output_bfd,
786 char **error_message)
787 {
788 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
789 input_section, output_bfd, error_message,
790 b23);
791 }
792
793 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)794 coff_thumb_pcrel_9 (bfd *abfd,
795 arelent *reloc_entry,
796 asymbol *symbol,
797 void * data,
798 asection *input_section,
799 bfd *output_bfd,
800 char **error_message)
801 {
802 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
803 input_section, output_bfd, error_message,
804 b9);
805 }
806 #endif /* not ARM_WINCE */
807
808 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)809 coff_thumb_pcrel_12 (bfd *abfd,
810 arelent *reloc_entry,
811 asymbol *symbol,
812 void * data,
813 asection *input_section,
814 bfd *output_bfd,
815 char **error_message)
816 {
817 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
818 input_section, output_bfd, error_message,
819 b12);
820 }
821
822 static reloc_howto_type *
coff_arm_reloc_type_lookup(bfd * abfd,bfd_reloc_code_real_type code)823 coff_arm_reloc_type_lookup (bfd * abfd, bfd_reloc_code_real_type code)
824 {
825 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
826
827 if (code == BFD_RELOC_CTOR)
828 switch (bfd_arch_bits_per_address (abfd))
829 {
830 case 32:
831 code = BFD_RELOC_32;
832 break;
833 default:
834 return NULL;
835 }
836
837 switch (code)
838 {
839 #ifdef ARM_WINCE
840 ASTD (BFD_RELOC_32, ARM_32);
841 ASTD (BFD_RELOC_RVA, ARM_RVA32);
842 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
843 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
844 ASTD (BFD_RELOC_32_SECREL, ARM_SECREL);
845 #else
846 ASTD (BFD_RELOC_8, ARM_8);
847 ASTD (BFD_RELOC_16, ARM_16);
848 ASTD (BFD_RELOC_32, ARM_32);
849 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
850 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
851 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
852 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
853 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
854 ASTD (BFD_RELOC_RVA, ARM_RVA32);
855 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
856 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
857 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
858 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
859 #endif
860 default: return NULL;
861 }
862 }
863
864 static reloc_howto_type *
coff_arm_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)865 coff_arm_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
866 const char *r_name)
867 {
868 unsigned int i;
869
870 for (i = 0;
871 i < (sizeof (aoutarm_std_reloc_howto)
872 / sizeof (aoutarm_std_reloc_howto[0]));
873 i++)
874 if (aoutarm_std_reloc_howto[i].name != NULL
875 && strcasecmp (aoutarm_std_reloc_howto[i].name, r_name) == 0)
876 return &aoutarm_std_reloc_howto[i];
877
878 return NULL;
879 }
880
881 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
882 #define COFF_PAGE_SIZE 0x1000
883
884 /* Turn a howto into a reloc nunmber. */
885 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
886 #define BADMAG(x) ARMBADMAG(x)
887 #define ARM 1 /* Customize coffcode.h. */
888
889 #ifndef ARM_WINCE
890 /* Make sure that the 'r_offset' field is copied properly
891 so that identical binaries will compare the same. */
892 #define SWAP_IN_RELOC_OFFSET H_GET_32
893 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
894 #endif
895
896 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
897 This allows us to store global data here without actually creating any
898 global variables, which is a no-no in the BFD world. */
899 struct coff_arm_link_hash_table
900 {
901 /* The original coff_link_hash_table structure. MUST be first field. */
902 struct coff_link_hash_table root;
903
904 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
905 bfd_size_type thumb_glue_size;
906
907 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
908 bfd_size_type arm_glue_size;
909
910 /* An arbitrary input BFD chosen to hold the glue sections. */
911 bfd * bfd_of_glue_owner;
912
913 /* Support interworking with old, non-interworking aware ARM code. */
914 int support_old_code;
915 };
916
917 /* Get the ARM coff linker hash table from a link_info structure. */
918 #define coff_arm_hash_table(info) \
919 ((struct coff_arm_link_hash_table *) ((info)->hash))
920
921 /* Create an ARM coff linker hash table. */
922
923 static struct bfd_link_hash_table *
coff_arm_link_hash_table_create(bfd * abfd)924 coff_arm_link_hash_table_create (bfd * abfd)
925 {
926 struct coff_arm_link_hash_table * ret;
927 size_t amt = sizeof (struct coff_arm_link_hash_table);
928
929 ret = bfd_zmalloc (amt);
930 if (ret == NULL)
931 return NULL;
932
933 if (!_bfd_coff_link_hash_table_init (&ret->root,
934 abfd,
935 _bfd_coff_link_hash_newfunc,
936 sizeof (struct coff_link_hash_entry)))
937 {
938 free (ret);
939 return NULL;
940 }
941
942 return & ret->root.root;
943 }
944
945 static bool
arm_emit_base_file_entry(struct bfd_link_info * info,bfd * output_bfd,asection * input_section,bfd_vma reloc_offset)946 arm_emit_base_file_entry (struct bfd_link_info *info,
947 bfd *output_bfd,
948 asection *input_section,
949 bfd_vma reloc_offset)
950 {
951 bfd_vma addr = (reloc_offset
952 - input_section->vma
953 + input_section->output_offset
954 + input_section->output_section->vma);
955
956 if (coff_data (output_bfd)->pe)
957 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
958 if (fwrite (&addr, sizeof (addr), 1, (FILE *) info->base_file) == 1)
959 return true;
960
961 bfd_set_error (bfd_error_system_call);
962 return false;
963 }
964
965 #ifndef ARM_WINCE
966 /* The thumb form of a long branch is a bit finicky, because the offset
967 encoding is split over two fields, each in it's own instruction. They
968 can occur in any order. So given a thumb form of long branch, and an
969 offset, insert the offset into the thumb branch and return finished
970 instruction.
971
972 It takes two thumb instructions to encode the target address. Each has
973 11 bits to invest. The upper 11 bits are stored in one (identified by
974 H-0.. see below), the lower 11 bits are stored in the other (identified
975 by H-1).
976
977 Combine together and shifted left by 1 (it's a half word address) and
978 there you have it.
979
980 Op: 1111 = F,
981 H-0, upper address-0 = 000
982 Op: 1111 = F,
983 H-1, lower address-0 = 800
984
985 They can be ordered either way, but the arm tools I've seen always put
986 the lower one first. It probably doesn't matter. krk@cygnus.com
987
988 XXX: Actually the order does matter. The second instruction (H-1)
989 moves the computed address into the PC, so it must be the second one
990 in the sequence. The problem, however is that whilst little endian code
991 stores the instructions in HI then LOW order, big endian code does the
992 reverse. nickc@cygnus.com. */
993
994 #define LOW_HI_ORDER 0xF800F000
995 #define HI_LOW_ORDER 0xF000F800
996
997 static insn32
insert_thumb_branch(insn32 br_insn,int rel_off)998 insert_thumb_branch (insn32 br_insn, int rel_off)
999 {
1000 unsigned int low_bits;
1001 unsigned int high_bits;
1002
1003 BFD_ASSERT ((rel_off & 1) != 1);
1004
1005 rel_off >>= 1; /* Half word aligned address. */
1006 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
1007 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
1008
1009 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1010 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1011 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1012 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1013 else
1014 /* FIXME: the BFD library should never abort except for internal errors
1015 - it should return an error status. */
1016 abort (); /* Error - not a valid branch instruction form. */
1017
1018 return br_insn;
1019 }
1020
1021
1022 static struct coff_link_hash_entry *
find_thumb_glue(struct bfd_link_info * info,const char * name,bfd * input_bfd)1023 find_thumb_glue (struct bfd_link_info *info,
1024 const char *name,
1025 bfd *input_bfd)
1026 {
1027 char *tmp_name;
1028 struct coff_link_hash_entry *myh;
1029 size_t amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1030
1031 tmp_name = bfd_malloc (amt);
1032
1033 BFD_ASSERT (tmp_name);
1034
1035 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1036
1037 myh = coff_link_hash_lookup
1038 (coff_hash_table (info), tmp_name, false, false, true);
1039
1040 if (myh == NULL)
1041 /* xgettext:c-format */
1042 _bfd_error_handler (_("%pB: unable to find THUMB glue '%s' for `%s'"),
1043 input_bfd, tmp_name, name);
1044
1045 free (tmp_name);
1046
1047 return myh;
1048 }
1049 #endif /* not ARM_WINCE */
1050
1051 static struct coff_link_hash_entry *
find_arm_glue(struct bfd_link_info * info,const char * name,bfd * input_bfd)1052 find_arm_glue (struct bfd_link_info *info,
1053 const char *name,
1054 bfd *input_bfd)
1055 {
1056 char *tmp_name;
1057 struct coff_link_hash_entry * myh;
1058 size_t amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1059
1060 tmp_name = bfd_malloc (amt);
1061
1062 BFD_ASSERT (tmp_name);
1063
1064 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1065
1066 myh = coff_link_hash_lookup
1067 (coff_hash_table (info), tmp_name, false, false, true);
1068
1069 if (myh == NULL)
1070 /* xgettext:c-format */
1071 _bfd_error_handler (_("%pB: unable to find ARM glue '%s' for `%s'"),
1072 input_bfd, tmp_name, name);
1073
1074 free (tmp_name);
1075
1076 return myh;
1077 }
1078
1079 /*
1080 ARM->Thumb glue:
1081
1082 .arm
1083 __func_from_arm:
1084 ldr r12, __func_addr
1085 bx r12
1086 __func_addr:
1087 .word func @ behave as if you saw a ARM_32 reloc
1088 */
1089
1090 #define ARM2THUMB_GLUE_SIZE 12
1091 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1092 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1093 static const insn32 a2t3_func_addr_insn = 0x00000001;
1094
1095 /*
1096 Thumb->ARM: Thumb->(non-interworking aware) ARM
1097
1098 .thumb .thumb
1099 .align 2 .align 2
1100 __func_from_thumb: __func_from_thumb:
1101 bx pc push {r6, lr}
1102 nop ldr r6, __func_addr
1103 .arm mov lr, pc
1104 __func_change_to_arm: bx r6
1105 b func .arm
1106 __func_back_to_thumb:
1107 ldmia r13! {r6, lr}
1108 bx lr
1109 __func_addr:
1110 .word func
1111 */
1112
1113 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1114 #ifndef ARM_WINCE
1115 static const insn16 t2a1_bx_pc_insn = 0x4778;
1116 static const insn16 t2a2_noop_insn = 0x46c0;
1117 static const insn32 t2a3_b_insn = 0xea000000;
1118
1119 static const insn16 t2a1_push_insn = 0xb540;
1120 static const insn16 t2a2_ldr_insn = 0x4e03;
1121 static const insn16 t2a3_mov_insn = 0x46fe;
1122 static const insn16 t2a4_bx_insn = 0x4730;
1123 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1124 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1125 #endif
1126
1127 /* TODO:
1128 We should really create new local (static) symbols in destination
1129 object for each stub we create. We should also create local
1130 (static) symbols within the stubs when switching between ARM and
1131 Thumb code. This will ensure that the debugger and disassembler
1132 can present a better view of stubs.
1133
1134 We can treat stubs like literal sections, and for the THUMB9 ones
1135 (short addressing range) we should be able to insert the stubs
1136 between sections. i.e. the simplest approach (since relocations
1137 are done on a section basis) is to dump the stubs at the end of
1138 processing a section. That way we can always try and minimise the
1139 offset to and from a stub. However, this does not map well onto
1140 the way that the linker/BFD does its work: mapping all input
1141 sections to output sections via the linker script before doing
1142 all the processing.
1143
1144 Unfortunately it may be easier to just to disallow short range
1145 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1146 only branch-and-link (BL) calls. This will simplify the processing
1147 since we can then put all of the stubs into their own section.
1148
1149 TODO:
1150 On a different subject, rather than complaining when a
1151 branch cannot fit in the number of bits available for the
1152 instruction we should generate a trampoline stub (needed to
1153 address the complete 32bit address space). */
1154
1155 /* The standard COFF backend linker does not cope with the special
1156 Thumb BRANCH23 relocation. The alternative would be to split the
1157 BRANCH23 into separate HI23 and LO23 relocations. However, it is a
1158 bit simpler simply providing our own relocation driver. */
1159
1160 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1161 This code is a very slightly modified copy of
1162 _bfd_coff_generic_relocate_section. It would be a much more
1163 maintainable solution to have a MACRO that could be expanded within
1164 _bfd_coff_generic_relocate_section that would only be provided for
1165 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1166 is different from the original. */
1167
1168 static bool
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)1169 coff_arm_relocate_section (bfd *output_bfd,
1170 struct bfd_link_info *info,
1171 bfd *input_bfd,
1172 asection *input_section,
1173 bfd_byte *contents,
1174 struct internal_reloc *relocs,
1175 struct internal_syment *syms,
1176 asection **sections)
1177 {
1178 struct internal_reloc * rel;
1179 struct internal_reloc * relend;
1180 #ifndef ARM_WINCE
1181 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1182 #endif
1183
1184 rel = relocs;
1185 relend = rel + input_section->reloc_count;
1186
1187 for (; rel < relend; rel++)
1188 {
1189 int done = 0;
1190 long symndx;
1191 struct coff_link_hash_entry * h;
1192 struct internal_syment * sym;
1193 bfd_vma addend;
1194 bfd_vma val;
1195 reloc_howto_type * howto;
1196 bfd_reloc_status_type rstat;
1197 bfd_vma h_val;
1198
1199 symndx = rel->r_symndx;
1200
1201 if (symndx == -1)
1202 {
1203 h = NULL;
1204 sym = NULL;
1205 }
1206 else
1207 {
1208 h = obj_coff_sym_hashes (input_bfd)[symndx];
1209 sym = syms + symndx;
1210 }
1211
1212 /* COFF treats common symbols in one of two ways. Either the
1213 size of the symbol is included in the section contents, or it
1214 is not. We assume that the size is not included, and force
1215 the rtype_to_howto function to adjust the addend as needed. */
1216
1217 if (sym != NULL && sym->n_scnum != 0)
1218 addend = - sym->n_value;
1219 else
1220 addend = 0;
1221
1222 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1223 sym, &addend);
1224 if (howto == NULL)
1225 return false;
1226
1227 /* The relocation_section function will skip pcrel_offset relocs
1228 when doing a relocatable link. However, we want to convert
1229 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1230 this case without pcrel_offset set, and adjust the addend to
1231 compensate. 'partial_inplace' is also set, since we want 'done'
1232 relocations to be reflected in section's data. */
1233 if (rel->r_type == ARM_26
1234 && h != NULL
1235 && bfd_link_relocatable (info)
1236 && (h->root.type == bfd_link_hash_defined
1237 || h->root.type == bfd_link_hash_defweak)
1238 && (h->root.u.def.section->output_section
1239 == input_section->output_section))
1240 {
1241 static reloc_howto_type fake_arm26_reloc =
1242 HOWTO (ARM_26,
1243 2,
1244 2,
1245 24,
1246 true,
1247 0,
1248 complain_overflow_signed,
1249 aoutarm_fix_pcrel_26 ,
1250 "ARM_26",
1251 true,
1252 0x00ffffff,
1253 0x00ffffff,
1254 false);
1255
1256 addend -= rel->r_vaddr - input_section->vma;
1257 #ifdef ARM_WINCE
1258 /* FIXME: I don't know why, but the hack is necessary for correct
1259 generation of bl's instruction offset. */
1260 addend -= 8;
1261 #endif
1262 howto = & fake_arm26_reloc;
1263 }
1264
1265 #ifdef ARM_WINCE
1266 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1267 the next opcode's pc, so is off by one. */
1268 if (howto->pc_relative && !bfd_link_relocatable (info))
1269 addend -= 8;
1270 #endif
1271
1272 /* If we are doing a relocatable link, then we can just ignore
1273 a PC relative reloc that is pcrel_offset. It will already
1274 have the correct value. If this is not a relocatable link,
1275 then we should ignore the symbol value. */
1276 if (howto->pc_relative && howto->pcrel_offset)
1277 {
1278 if (bfd_link_relocatable (info))
1279 continue;
1280 /* FIXME - it is not clear which targets need this next test
1281 and which do not. It is known that it is needed for the
1282 VxWorks targets but it is also known that it was suppressed
1283 for other ARM targets. This ought to be sorted out one day. */
1284 #ifdef ARM_COFF_BUGFIX
1285 /* We must not ignore the symbol value. If the symbol is
1286 within the same section, the relocation should have already
1287 been fixed, but if it is not, we'll be handed a reloc into
1288 the beginning of the symbol's section, so we must not cancel
1289 out the symbol's value, otherwise we'll be adding it in
1290 twice. */
1291 if (sym != NULL && sym->n_scnum != 0)
1292 addend += sym->n_value;
1293 #endif
1294 }
1295
1296 val = 0;
1297
1298 if (h == NULL)
1299 {
1300 asection *sec;
1301
1302 if (symndx == -1)
1303 {
1304 sec = bfd_abs_section_ptr;
1305 val = 0;
1306 }
1307 else
1308 {
1309 sec = sections[symndx];
1310 val = (sec->output_section->vma
1311 + sec->output_offset
1312 + sym->n_value
1313 - sec->vma);
1314 }
1315 }
1316 else
1317 {
1318 /* We don't output the stubs if we are generating a
1319 relocatable output file, since we may as well leave the
1320 stub generation to the final linker pass. If we fail to
1321 verify that the name is defined, we'll try to build stubs
1322 for an undefined name... */
1323 if (! bfd_link_relocatable (info)
1324 && ( h->root.type == bfd_link_hash_defined
1325 || h->root.type == bfd_link_hash_defweak))
1326 {
1327 asection * h_sec = h->root.u.def.section;
1328 const char * name = h->root.root.string;
1329
1330 /* h locates the symbol referenced in the reloc. */
1331 h_val = (h->root.u.def.value
1332 + h_sec->output_section->vma
1333 + h_sec->output_offset);
1334
1335 if (howto->type == ARM_26)
1336 {
1337 if ( h->symbol_class == C_THUMBSTATFUNC
1338 || h->symbol_class == C_THUMBEXTFUNC)
1339 {
1340 /* Arm code calling a Thumb function. */
1341 unsigned long int tmp;
1342 bfd_vma my_offset;
1343 asection * s;
1344 long int ret_offset;
1345 struct coff_link_hash_entry * myh;
1346 struct coff_arm_link_hash_table * globals;
1347
1348 myh = find_arm_glue (info, name, input_bfd);
1349 if (myh == NULL)
1350 return false;
1351
1352 globals = coff_arm_hash_table (info);
1353
1354 BFD_ASSERT (globals != NULL);
1355 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1356
1357 my_offset = myh->root.u.def.value;
1358
1359 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1360 ARM2THUMB_GLUE_SECTION_NAME);
1361 BFD_ASSERT (s != NULL);
1362 BFD_ASSERT (s->contents != NULL);
1363 BFD_ASSERT (s->output_section != NULL);
1364
1365 if ((my_offset & 0x01) == 0x01)
1366 {
1367 if (h_sec->owner != NULL
1368 && INTERWORK_SET (h_sec->owner)
1369 && ! INTERWORK_FLAG (h_sec->owner))
1370 _bfd_error_handler
1371 /* xgettext:c-format */
1372 (_("%pB(%s): warning: interworking not enabled; "
1373 "first occurrence: %pB: arm call to thumb"),
1374 h_sec->owner, name, input_bfd);
1375
1376 --my_offset;
1377 myh->root.u.def.value = my_offset;
1378
1379 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1380 s->contents + my_offset);
1381
1382 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1383 s->contents + my_offset + 4);
1384
1385 /* It's a thumb address. Add the low order bit. */
1386 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1387 s->contents + my_offset + 8);
1388
1389 if (info->base_file
1390 && !arm_emit_base_file_entry (info, output_bfd,
1391 s, my_offset + 8))
1392 return false;
1393 }
1394
1395 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1396
1397 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1398 - input_section->vma);
1399
1400 tmp = tmp & 0xFF000000;
1401
1402 /* Somehow these are both 4 too far, so subtract 8. */
1403 ret_offset =
1404 s->output_offset
1405 + my_offset
1406 + s->output_section->vma
1407 - (input_section->output_offset
1408 + input_section->output_section->vma
1409 + rel->r_vaddr)
1410 - 8;
1411
1412 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1413
1414 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1415 contents + rel->r_vaddr - input_section->vma);
1416 done = 1;
1417 }
1418 }
1419
1420 #ifndef ARM_WINCE
1421 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1422 else if (howto->type == ARM_THUMB23)
1423 {
1424 if ( h->symbol_class == C_EXT
1425 || h->symbol_class == C_STAT
1426 || h->symbol_class == C_LABEL)
1427 {
1428 /* Thumb code calling an ARM function. */
1429 asection * s = 0;
1430 bfd_vma my_offset;
1431 unsigned long int tmp;
1432 long int ret_offset;
1433 struct coff_link_hash_entry * myh;
1434 struct coff_arm_link_hash_table * globals;
1435
1436 myh = find_thumb_glue (info, name, input_bfd);
1437 if (myh == NULL)
1438 return false;
1439
1440 globals = coff_arm_hash_table (info);
1441
1442 BFD_ASSERT (globals != NULL);
1443 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1444
1445 my_offset = myh->root.u.def.value;
1446
1447 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1448 THUMB2ARM_GLUE_SECTION_NAME);
1449
1450 BFD_ASSERT (s != NULL);
1451 BFD_ASSERT (s->contents != NULL);
1452 BFD_ASSERT (s->output_section != NULL);
1453
1454 if ((my_offset & 0x01) == 0x01)
1455 {
1456 if (h_sec->owner != NULL
1457 && INTERWORK_SET (h_sec->owner)
1458 && ! INTERWORK_FLAG (h_sec->owner)
1459 && ! globals->support_old_code)
1460 _bfd_error_handler
1461 /* xgettext:c-format */
1462 (_("%pB(%s): warning: interworking not enabled; "
1463 "first occurrence: %pB: thumb call to arm; "
1464 "consider relinking with --support-old-code "
1465 "enabled"),
1466 h_sec->owner, name, input_bfd);
1467
1468 -- my_offset;
1469 myh->root.u.def.value = my_offset;
1470
1471 if (globals->support_old_code)
1472 {
1473 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1474 s->contents + my_offset);
1475
1476 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1477 s->contents + my_offset + 2);
1478
1479 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1480 s->contents + my_offset + 4);
1481
1482 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1483 s->contents + my_offset + 6);
1484
1485 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1486 s->contents + my_offset + 8);
1487
1488 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1489 s->contents + my_offset + 12);
1490
1491 /* Store the address of the function in the last word of the stub. */
1492 bfd_put_32 (output_bfd, h_val,
1493 s->contents + my_offset + 16);
1494
1495 if (info->base_file
1496 && !arm_emit_base_file_entry (info,
1497 output_bfd, s,
1498 my_offset + 16))
1499 return false;
1500 }
1501 else
1502 {
1503 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1504 s->contents + my_offset);
1505
1506 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1507 s->contents + my_offset + 2);
1508
1509 ret_offset =
1510 /* Address of destination of the stub. */
1511 ((bfd_signed_vma) h_val)
1512 - ((bfd_signed_vma)
1513 /* Offset from the start of the current section to the start of the stubs. */
1514 (s->output_offset
1515 /* Offset of the start of this stub from the start of the stubs. */
1516 + my_offset
1517 /* Address of the start of the current section. */
1518 + s->output_section->vma)
1519 /* The branch instruction is 4 bytes into the stub. */
1520 + 4
1521 /* ARM branches work from the pc of the instruction + 8. */
1522 + 8);
1523
1524 bfd_put_32 (output_bfd,
1525 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1526 s->contents + my_offset + 4);
1527
1528 }
1529 }
1530
1531 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1532
1533 /* Now go back and fix up the original BL insn to point
1534 to here. */
1535 ret_offset =
1536 s->output_offset
1537 + my_offset
1538 - (input_section->output_offset
1539 + rel->r_vaddr)
1540 -4;
1541
1542 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1543 - input_section->vma);
1544
1545 bfd_put_32 (output_bfd,
1546 (bfd_vma) insert_thumb_branch (tmp,
1547 ret_offset),
1548 contents + rel->r_vaddr - input_section->vma);
1549
1550 done = 1;
1551 }
1552 }
1553 #endif
1554 }
1555
1556 /* If the relocation type and destination symbol does not
1557 fall into one of the above categories, then we can just
1558 perform a direct link. */
1559
1560 if (done)
1561 rstat = bfd_reloc_ok;
1562 else
1563 if ( h->root.type == bfd_link_hash_defined
1564 || h->root.type == bfd_link_hash_defweak)
1565 {
1566 asection *sec;
1567
1568 sec = h->root.u.def.section;
1569 val = (h->root.u.def.value
1570 + sec->output_section->vma
1571 + sec->output_offset);
1572 }
1573
1574 else if (! bfd_link_relocatable (info))
1575 (*info->callbacks->undefined_symbol)
1576 (info, h->root.root.string, input_bfd, input_section,
1577 rel->r_vaddr - input_section->vma, true);
1578 }
1579
1580 /* Emit a reloc if the backend thinks it needs it. */
1581 if (info->base_file
1582 && sym
1583 && pe_data(output_bfd)->in_reloc_p(output_bfd, howto)
1584 && !arm_emit_base_file_entry (info, output_bfd, input_section,
1585 rel->r_vaddr))
1586 return false;
1587
1588 if (done)
1589 rstat = bfd_reloc_ok;
1590 #ifndef ARM_WINCE
1591 /* Only perform this fix during the final link, not a relocatable link. */
1592 else if (! bfd_link_relocatable (info)
1593 && howto->type == ARM_THUMB23)
1594 {
1595 /* This is pretty much a copy of what the default
1596 _bfd_final_link_relocate and _bfd_relocate_contents
1597 routines do to perform a relocation, with special
1598 processing for the split addressing of the Thumb BL
1599 instruction. Again, it would probably be simpler adding a
1600 ThumbBRANCH23 specific macro expansion into the default
1601 code. */
1602
1603 bfd_vma address = rel->r_vaddr - input_section->vma;
1604
1605 if (address > high_address)
1606 rstat = bfd_reloc_outofrange;
1607 else
1608 {
1609 bfd_vma relocation = val + addend;
1610 int size = bfd_get_reloc_size (howto);
1611 bool overflow = false;
1612 bfd_byte *location = contents + address;
1613 bfd_vma x = bfd_get_32 (input_bfd, location);
1614 bfd_vma src_mask = 0x007FFFFE;
1615 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1616 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1617 bfd_vma check;
1618 bfd_signed_vma signed_check;
1619 bfd_vma add;
1620 bfd_signed_vma signed_add;
1621
1622 BFD_ASSERT (size == 4);
1623
1624 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1625 relocation -= (input_section->output_section->vma
1626 + input_section->output_offset);
1627
1628 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1629 relocation -= address;
1630
1631 /* No need to negate the relocation with BRANCH23. */
1632 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1633 /* howto->rightshift == 1 */
1634
1635 /* Drop unwanted bits from the value we are relocating to. */
1636 check = relocation >> howto->rightshift;
1637
1638 /* If this is a signed value, the rightshift just dropped
1639 leading 1 bits (assuming twos complement). */
1640 if ((bfd_signed_vma) relocation >= 0)
1641 signed_check = check;
1642 else
1643 signed_check = (check
1644 | ((bfd_vma) - 1
1645 & ~((bfd_vma) - 1 >> howto->rightshift)));
1646
1647 /* Get the value from the object file. */
1648 if (bfd_big_endian (input_bfd))
1649 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1650 else
1651 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1652
1653 /* Get the value from the object file with an appropriate sign.
1654 The expression involving howto->src_mask isolates the upper
1655 bit of src_mask. If that bit is set in the value we are
1656 adding, it is negative, and we subtract out that number times
1657 two. If src_mask includes the highest possible bit, then we
1658 can not get the upper bit, but that does not matter since
1659 signed_add needs no adjustment to become negative in that
1660 case. */
1661 signed_add = add;
1662
1663 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1664 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1665
1666 /* howto->bitpos == 0 */
1667 /* Add the value from the object file, shifted so that it is a
1668 straight number. */
1669 signed_check += signed_add;
1670 relocation += signed_add;
1671
1672 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1673
1674 /* Assumes two's complement. */
1675 if ( signed_check > reloc_signed_max
1676 || signed_check < reloc_signed_min)
1677 overflow = true;
1678
1679 /* Put the relocation into the correct bits.
1680 For a BLX instruction, make sure that the relocation is rounded up
1681 to a word boundary. This follows the semantics of the instruction
1682 which specifies that bit 1 of the target address will come from bit
1683 1 of the base address. */
1684 if (bfd_big_endian (input_bfd))
1685 {
1686 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1687 relocation += 2;
1688 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1689 }
1690 else
1691 {
1692 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1693 relocation += 2;
1694 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1695 }
1696
1697 /* Add the relocation to the correct bits of X. */
1698 x = ((x & ~howto->dst_mask) | relocation);
1699
1700 /* Put the relocated value back in the object file. */
1701 bfd_put_32 (input_bfd, x, location);
1702
1703 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1704 }
1705 }
1706 #endif
1707 else
1708 if (bfd_link_relocatable (info) && ! howto->partial_inplace)
1709 rstat = bfd_reloc_ok;
1710 else
1711 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1712 contents,
1713 rel->r_vaddr - input_section->vma,
1714 val, addend);
1715 /* Only perform this fix during the final link, not a relocatable link. */
1716 if (! bfd_link_relocatable (info)
1717 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1718 {
1719 /* Determine if we need to set the bottom bit of a relocated address
1720 because the address is the address of a Thumb code symbol. */
1721 int patchit = false;
1722
1723 if (h != NULL
1724 && ( h->symbol_class == C_THUMBSTATFUNC
1725 || h->symbol_class == C_THUMBEXTFUNC))
1726 {
1727 patchit = true;
1728 }
1729 else if (sym != NULL
1730 && sym->n_scnum > N_UNDEF)
1731 {
1732 /* No hash entry - use the symbol instead. */
1733 if ( sym->n_sclass == C_THUMBSTATFUNC
1734 || sym->n_sclass == C_THUMBEXTFUNC)
1735 patchit = true;
1736 }
1737
1738 if (patchit)
1739 {
1740 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1741 bfd_vma x = bfd_get_32 (input_bfd, location);
1742
1743 bfd_put_32 (input_bfd, x | 1, location);
1744 }
1745 }
1746
1747 switch (rstat)
1748 {
1749 default:
1750 abort ();
1751 case bfd_reloc_ok:
1752 break;
1753 case bfd_reloc_outofrange:
1754 _bfd_error_handler
1755 /* xgettext:c-format */
1756 (_("%pB: bad reloc address %#" PRIx64 " in section `%pA'"),
1757 input_bfd, (uint64_t) rel->r_vaddr, input_section);
1758 return false;
1759 case bfd_reloc_overflow:
1760 {
1761 const char *name;
1762 char buf[SYMNMLEN + 1];
1763
1764 if (symndx == -1)
1765 name = "*ABS*";
1766 else if (h != NULL)
1767 name = NULL;
1768 else
1769 {
1770 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1771 if (name == NULL)
1772 return false;
1773 }
1774
1775 (*info->callbacks->reloc_overflow)
1776 (info, (h ? &h->root : NULL), name, howto->name,
1777 (bfd_vma) 0, input_bfd, input_section,
1778 rel->r_vaddr - input_section->vma);
1779 }
1780 }
1781 }
1782
1783 return true;
1784 }
1785
1786 #ifndef COFF_IMAGE_WITH_PE
1787
1788 bool
bfd_arm_allocate_interworking_sections(struct bfd_link_info * info)1789 bfd_arm_allocate_interworking_sections (struct bfd_link_info * info)
1790 {
1791 asection * s;
1792 bfd_byte * foo;
1793 struct coff_arm_link_hash_table * globals;
1794
1795 globals = coff_arm_hash_table (info);
1796
1797 BFD_ASSERT (globals != NULL);
1798
1799 if (globals->arm_glue_size != 0)
1800 {
1801 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1802
1803 s = bfd_get_section_by_name
1804 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1805
1806 BFD_ASSERT (s != NULL);
1807
1808 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1809
1810 s->size = globals->arm_glue_size;
1811 s->contents = foo;
1812 }
1813
1814 if (globals->thumb_glue_size != 0)
1815 {
1816 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1817
1818 s = bfd_get_section_by_name
1819 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1820
1821 BFD_ASSERT (s != NULL);
1822
1823 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1824
1825 s->size = globals->thumb_glue_size;
1826 s->contents = foo;
1827 }
1828
1829 return true;
1830 }
1831
1832 static void
record_arm_to_thumb_glue(struct bfd_link_info * info,struct coff_link_hash_entry * h)1833 record_arm_to_thumb_glue (struct bfd_link_info * info,
1834 struct coff_link_hash_entry * h)
1835 {
1836 const char * name = h->root.root.string;
1837 register asection * s;
1838 char * tmp_name;
1839 struct coff_link_hash_entry * myh;
1840 struct bfd_link_hash_entry * bh;
1841 struct coff_arm_link_hash_table * globals;
1842 bfd_vma val;
1843 size_t amt;
1844
1845 globals = coff_arm_hash_table (info);
1846
1847 BFD_ASSERT (globals != NULL);
1848 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1849
1850 s = bfd_get_section_by_name
1851 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1852
1853 BFD_ASSERT (s != NULL);
1854
1855 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1856 tmp_name = bfd_malloc (amt);
1857
1858 BFD_ASSERT (tmp_name);
1859
1860 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1861
1862 myh = coff_link_hash_lookup
1863 (coff_hash_table (info), tmp_name, false, false, true);
1864
1865 if (myh != NULL)
1866 {
1867 free (tmp_name);
1868 /* We've already seen this guy. */
1869 return;
1870 }
1871
1872 /* The only trick here is using globals->arm_glue_size as the value. Even
1873 though the section isn't allocated yet, this is where we will be putting
1874 it. */
1875 bh = NULL;
1876 val = globals->arm_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 free (tmp_name);
1881
1882 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1883
1884 return;
1885 }
1886
1887 #ifndef ARM_WINCE
1888 static void
record_thumb_to_arm_glue(struct bfd_link_info * info,struct coff_link_hash_entry * h)1889 record_thumb_to_arm_glue (struct bfd_link_info * info,
1890 struct coff_link_hash_entry * h)
1891 {
1892 const char * name = h->root.root.string;
1893 asection * s;
1894 char * tmp_name;
1895 struct coff_link_hash_entry * myh;
1896 struct bfd_link_hash_entry * bh;
1897 struct coff_arm_link_hash_table * globals;
1898 bfd_vma val;
1899 size_t amt;
1900
1901 globals = coff_arm_hash_table (info);
1902
1903 BFD_ASSERT (globals != NULL);
1904 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1905
1906 s = bfd_get_section_by_name
1907 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1908
1909 BFD_ASSERT (s != NULL);
1910
1911 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1912 tmp_name = bfd_malloc (amt);
1913
1914 BFD_ASSERT (tmp_name);
1915
1916 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1917
1918 myh = coff_link_hash_lookup
1919 (coff_hash_table (info), tmp_name, false, false, true);
1920
1921 if (myh != NULL)
1922 {
1923 free (tmp_name);
1924 /* We've already seen this guy. */
1925 return;
1926 }
1927
1928 bh = NULL;
1929 val = globals->thumb_glue_size + 1;
1930 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1931 BSF_GLOBAL, s, val, NULL, true, false, &bh);
1932
1933 /* If we mark it 'thumb', the disassembler will do a better job. */
1934 myh = (struct coff_link_hash_entry *) bh;
1935 myh->symbol_class = C_THUMBEXTFUNC;
1936
1937 free (tmp_name);
1938
1939 /* Allocate another symbol to mark where we switch to arm mode. */
1940
1941 #define CHANGE_TO_ARM "__%s_change_to_arm"
1942 #define BACK_FROM_ARM "__%s_back_from_arm"
1943
1944 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1945 tmp_name = bfd_malloc (amt);
1946
1947 BFD_ASSERT (tmp_name);
1948
1949 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1950
1951 bh = NULL;
1952 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1953 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1954 BSF_LOCAL, s, val, NULL, true, false, &bh);
1955
1956 free (tmp_name);
1957
1958 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1959
1960 return;
1961 }
1962 #endif /* not ARM_WINCE */
1963
1964 /* Select a BFD to be used to hold the sections used by the glue code.
1965 This function is called from the linker scripts in ld/emultempl/
1966 {armcoff/pe}.em */
1967
1968 bool
bfd_arm_get_bfd_for_interworking(bfd * abfd,struct bfd_link_info * info)1969 bfd_arm_get_bfd_for_interworking (bfd * abfd,
1970 struct bfd_link_info * info)
1971 {
1972 struct coff_arm_link_hash_table * globals;
1973 flagword flags;
1974 asection * sec;
1975
1976 /* If we are only performing a partial link do not bother
1977 getting a bfd to hold the glue. */
1978 if (bfd_link_relocatable (info))
1979 return true;
1980
1981 globals = coff_arm_hash_table (info);
1982
1983 BFD_ASSERT (globals != NULL);
1984
1985 if (globals->bfd_of_glue_owner != NULL)
1986 return true;
1987
1988 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1989
1990 if (sec == NULL)
1991 {
1992 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1993 | SEC_CODE | SEC_READONLY);
1994 sec = bfd_make_section_with_flags (abfd, ARM2THUMB_GLUE_SECTION_NAME,
1995 flags);
1996 if (sec == NULL
1997 || !bfd_set_section_alignment (sec, 2))
1998 return false;
1999 }
2000
2001 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2002
2003 if (sec == NULL)
2004 {
2005 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2006 | SEC_CODE | SEC_READONLY);
2007 sec = bfd_make_section_with_flags (abfd, THUMB2ARM_GLUE_SECTION_NAME,
2008 flags);
2009
2010 if (sec == NULL
2011 || !bfd_set_section_alignment (sec, 2))
2012 return false;
2013 }
2014
2015 /* Save the bfd for later use. */
2016 globals->bfd_of_glue_owner = abfd;
2017
2018 return true;
2019 }
2020
2021 bool
bfd_arm_process_before_allocation(bfd * abfd,struct bfd_link_info * info,int support_old_code)2022 bfd_arm_process_before_allocation (bfd * abfd,
2023 struct bfd_link_info * info,
2024 int support_old_code)
2025 {
2026 asection * sec;
2027 struct coff_arm_link_hash_table * globals;
2028
2029 /* If we are only performing a partial link do not bother
2030 to construct any glue. */
2031 if (bfd_link_relocatable (info))
2032 return true;
2033
2034 /* Here we have a bfd that is to be included on the link. We have a hook
2035 to do reloc rummaging, before section sizes are nailed down. */
2036 _bfd_coff_get_external_symbols (abfd);
2037
2038 globals = coff_arm_hash_table (info);
2039
2040 BFD_ASSERT (globals != NULL);
2041 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2042
2043 globals->support_old_code = support_old_code;
2044
2045 /* Rummage around all the relocs and map the glue vectors. */
2046 sec = abfd->sections;
2047
2048 if (sec == NULL)
2049 return true;
2050
2051 for (; sec != NULL; sec = sec->next)
2052 {
2053 struct internal_reloc * i;
2054 struct internal_reloc * rel;
2055
2056 if (sec->reloc_count == 0)
2057 continue;
2058
2059 /* Load the relocs. */
2060 /* FIXME: there may be a storage leak here. */
2061 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2062
2063 BFD_ASSERT (i != 0);
2064
2065 for (rel = i; rel < i + sec->reloc_count; ++rel)
2066 {
2067 unsigned short r_type = rel->r_type;
2068 long symndx;
2069 struct coff_link_hash_entry * h;
2070
2071 symndx = rel->r_symndx;
2072
2073 /* If the relocation is not against a symbol it cannot concern us. */
2074 if (symndx == -1)
2075 continue;
2076
2077 /* If the index is outside of the range of our table, something has gone wrong. */
2078 if (symndx >= obj_conv_table_size (abfd))
2079 {
2080 /* xgettext:c-format */
2081 _bfd_error_handler (_("%pB: illegal symbol index in reloc: %ld"),
2082 abfd, symndx);
2083 continue;
2084 }
2085
2086 h = obj_coff_sym_hashes (abfd)[symndx];
2087
2088 /* If the relocation is against a static symbol it must be within
2089 the current section and so cannot be a cross ARM/Thumb relocation. */
2090 if (h == NULL)
2091 continue;
2092
2093 switch (r_type)
2094 {
2095 case ARM_26:
2096 /* This one is a call from arm code. We need to look up
2097 the target of the call. If it is a thumb target, we
2098 insert glue. */
2099
2100 if (h->symbol_class == C_THUMBEXTFUNC)
2101 record_arm_to_thumb_glue (info, h);
2102 break;
2103
2104 #ifndef ARM_WINCE
2105 case ARM_THUMB23:
2106 /* This one is a call from thumb code. We used to look
2107 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2108 up the target of the call. If it is an arm target, we
2109 insert glue. If the symbol does not exist it will be
2110 given a class of C_EXT and so we will generate a stub
2111 for it. This is not really a problem, since the link
2112 is doomed anyway. */
2113
2114 switch (h->symbol_class)
2115 {
2116 case C_EXT:
2117 case C_STAT:
2118 case C_LABEL:
2119 record_thumb_to_arm_glue (info, h);
2120 break;
2121 default:
2122 ;
2123 }
2124 break;
2125 #endif
2126
2127 default:
2128 break;
2129 }
2130 }
2131 }
2132
2133 return true;
2134 }
2135
2136 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2137
2138 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2139 #define coff_bfd_reloc_name_lookup coff_arm_reloc_name_lookup
2140 #define coff_relocate_section coff_arm_relocate_section
2141 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2142 #define coff_adjust_symndx coff_arm_adjust_symndx
2143 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2144 #define coff_final_link_postscript coff_arm_final_link_postscript
2145 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2146 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2147 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2148 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2149 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2150
2151 /* When doing a relocatable link, we want to convert ARM_26 relocs
2152 into ARM_26D relocs. */
2153
2154 static bool
coff_arm_adjust_symndx(bfd * obfd ATTRIBUTE_UNUSED,struct bfd_link_info * info ATTRIBUTE_UNUSED,bfd * ibfd,asection * sec,struct internal_reloc * irel,bool * adjustedp)2155 coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
2156 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2157 bfd *ibfd,
2158 asection *sec,
2159 struct internal_reloc *irel,
2160 bool *adjustedp)
2161 {
2162 if (irel->r_type == ARM_26)
2163 {
2164 struct coff_link_hash_entry *h;
2165
2166 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2167 if (h != NULL
2168 && (h->root.type == bfd_link_hash_defined
2169 || h->root.type == bfd_link_hash_defweak)
2170 && h->root.u.def.section->output_section == sec->output_section)
2171 irel->r_type = ARM_26D;
2172 }
2173 *adjustedp = false;
2174 return true;
2175 }
2176
2177 /* Called when merging the private data areas of two BFDs.
2178 This is important as it allows us to detect if we are
2179 attempting to merge binaries compiled for different ARM
2180 targets, eg different CPUs or different APCS's. */
2181
2182 static bool
coff_arm_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)2183 coff_arm_merge_private_bfd_data (bfd * ibfd, struct bfd_link_info *info)
2184 {
2185 bfd *obfd = info->output_bfd;
2186 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2187
2188 if (ibfd == obfd)
2189 return true;
2190
2191 /* If the two formats are different we cannot merge anything.
2192 This is not an error, since it is permissable to change the
2193 input and output formats. */
2194 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2195 || obfd->xvec->flavour != bfd_target_coff_flavour)
2196 return true;
2197
2198 /* Determine what should happen if the input ARM architecture
2199 does not match the output ARM architecture. */
2200 if (! bfd_arm_merge_machines (ibfd, obfd))
2201 return false;
2202
2203 /* Verify that the APCS is the same for the two BFDs. */
2204 if (APCS_SET (ibfd))
2205 {
2206 if (APCS_SET (obfd))
2207 {
2208 /* If the src and dest have different APCS flag bits set, fail. */
2209 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2210 {
2211 _bfd_error_handler
2212 /* xgettext: c-format */
2213 (_("error: %pB is compiled for APCS-%d, "
2214 "whereas %pB is compiled for APCS-%d"),
2215 ibfd, APCS_26_FLAG (ibfd) ? 26 : 32,
2216 obfd, APCS_26_FLAG (obfd) ? 26 : 32
2217 );
2218
2219 bfd_set_error (bfd_error_wrong_format);
2220 return false;
2221 }
2222
2223 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2224 {
2225 if (APCS_FLOAT_FLAG (ibfd))
2226 /* xgettext: c-format */
2227 _bfd_error_handler
2228 (_("error: %pB passes floats in float registers, "
2229 "whereas %pB passes them in integer registers"),
2230 ibfd, obfd);
2231 else
2232 /* xgettext: c-format */
2233 _bfd_error_handler
2234 (_("error: %pB passes floats in integer registers, "
2235 "whereas %pB passes them in float registers"),
2236 ibfd, obfd);
2237
2238 bfd_set_error (bfd_error_wrong_format);
2239 return false;
2240 }
2241
2242 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2243 {
2244 if (PIC_FLAG (ibfd))
2245 /* xgettext: c-format */
2246 _bfd_error_handler
2247 (_("error: %pB is compiled as position independent code, "
2248 "whereas target %pB is absolute position"),
2249 ibfd, obfd);
2250 else
2251 /* xgettext: c-format */
2252 _bfd_error_handler
2253 (_("error: %pB is compiled as absolute position code, "
2254 "whereas target %pB is position independent"),
2255 ibfd, obfd);
2256
2257 bfd_set_error (bfd_error_wrong_format);
2258 return false;
2259 }
2260 }
2261 else
2262 {
2263 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2264
2265 /* Set up the arch and fields as well as these are probably wrong. */
2266 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2267 }
2268 }
2269
2270 /* Check the interworking support. */
2271 if (INTERWORK_SET (ibfd))
2272 {
2273 if (INTERWORK_SET (obfd))
2274 {
2275 /* If the src and dest differ in their interworking issue a warning. */
2276 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2277 {
2278 if (INTERWORK_FLAG (ibfd))
2279 /* xgettext: c-format */
2280 _bfd_error_handler (_("warning: %pB supports interworking, "
2281 "whereas %pB does not"),
2282 ibfd, obfd);
2283 else
2284 /* xgettext: c-format */
2285 _bfd_error_handler
2286 (_("warning: %pB does not support interworking, "
2287 "whereas %pB does"),
2288 ibfd, obfd);
2289 }
2290 }
2291 else
2292 {
2293 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2294 }
2295 }
2296
2297 return true;
2298 }
2299
2300 /* Display the flags field. */
2301
2302 static bool
coff_arm_print_private_bfd_data(bfd * abfd,void * ptr)2303 coff_arm_print_private_bfd_data (bfd * abfd, void * ptr)
2304 {
2305 FILE * file = (FILE *) ptr;
2306
2307 BFD_ASSERT (abfd != NULL && ptr != NULL);
2308
2309 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2310
2311 if (APCS_SET (abfd))
2312 {
2313 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2314 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2315
2316 if (APCS_FLOAT_FLAG (abfd))
2317 fprintf (file, _(" [floats passed in float registers]"));
2318 else
2319 fprintf (file, _(" [floats passed in integer registers]"));
2320
2321 if (PIC_FLAG (abfd))
2322 fprintf (file, _(" [position independent]"));
2323 else
2324 fprintf (file, _(" [absolute position]"));
2325 }
2326
2327 if (! INTERWORK_SET (abfd))
2328 fprintf (file, _(" [interworking flag not initialised]"));
2329 else if (INTERWORK_FLAG (abfd))
2330 fprintf (file, _(" [interworking supported]"));
2331 else
2332 fprintf (file, _(" [interworking not supported]"));
2333
2334 fputc ('\n', file);
2335
2336 return true;
2337 }
2338
2339 /* Copies the given flags into the coff_tdata.flags field.
2340 Typically these flags come from the f_flags[] field of
2341 the COFF filehdr structure, which contains important,
2342 target specific information.
2343 Note: Although this function is static, it is explicitly
2344 called from both coffcode.h and peicode.h. */
2345
2346 static bool
_bfd_coff_arm_set_private_flags(bfd * abfd,flagword flags)2347 _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags)
2348 {
2349 flagword flag;
2350
2351 BFD_ASSERT (abfd != NULL);
2352
2353 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2354
2355 /* Make sure that the APCS field has not been initialised to the opposite
2356 value. */
2357 if (APCS_SET (abfd)
2358 && ( (APCS_26_FLAG (abfd) != flag)
2359 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2360 || (PIC_FLAG (abfd) != (flags & F_PIC))
2361 ))
2362 return false;
2363
2364 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2365
2366 SET_APCS_FLAGS (abfd, flag);
2367
2368 flag = (flags & F_INTERWORK);
2369
2370 /* If the BFD has already had its interworking flag set, but it
2371 is different from the value that we have been asked to set,
2372 then assume that that merged code will not support interworking
2373 and set the flag accordingly. */
2374 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2375 {
2376 if (flag)
2377 _bfd_error_handler (_("warning: not setting interworking flag of %pB since it has already been specified as non-interworking"),
2378 abfd);
2379 else
2380 _bfd_error_handler (_("warning: clearing the interworking flag of %pB due to outside request"),
2381 abfd);
2382 flag = 0;
2383 }
2384
2385 SET_INTERWORK_FLAG (abfd, flag);
2386
2387 return true;
2388 }
2389
2390 /* Copy the important parts of the target specific data
2391 from one instance of a BFD to another. */
2392
2393 static bool
coff_arm_copy_private_bfd_data(bfd * src,bfd * dest)2394 coff_arm_copy_private_bfd_data (bfd * src, bfd * dest)
2395 {
2396 BFD_ASSERT (src != NULL && dest != NULL);
2397
2398 if (src == dest)
2399 return true;
2400
2401 /* If the destination is not in the same format as the source, do not do
2402 the copy. */
2403 if (src->xvec != dest->xvec)
2404 return true;
2405
2406 /* Copy the flags field. */
2407 if (APCS_SET (src))
2408 {
2409 if (APCS_SET (dest))
2410 {
2411 /* If the src and dest have different APCS flag bits set, fail. */
2412 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2413 return false;
2414
2415 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2416 return false;
2417
2418 if (PIC_FLAG (dest) != PIC_FLAG (src))
2419 return false;
2420 }
2421 else
2422 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2423 | PIC_FLAG (src));
2424 }
2425
2426 if (INTERWORK_SET (src))
2427 {
2428 if (INTERWORK_SET (dest))
2429 {
2430 /* If the src and dest have different interworking flags then turn
2431 off the interworking bit. */
2432 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2433 {
2434 if (INTERWORK_FLAG (dest))
2435 {
2436 /* xgettext:c-format */
2437 _bfd_error_handler
2438 (_("warning: clearing the interworking flag of %pB "
2439 "because non-interworking code in %pB has been "
2440 "linked with it"),
2441 dest, src);
2442 }
2443
2444 SET_INTERWORK_FLAG (dest, 0);
2445 }
2446 }
2447 else
2448 {
2449 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2450 }
2451 }
2452
2453 return true;
2454 }
2455
2456 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2457 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2458 #ifndef LOCAL_LABEL_PREFIX
2459 #define LOCAL_LABEL_PREFIX ""
2460 #endif
2461 #ifndef USER_LABEL_PREFIX
2462 #define USER_LABEL_PREFIX "_"
2463 #endif
2464
2465 /* Like _bfd_coff_is_local_label_name, but
2466 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2467 non-local.
2468 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2469 labels of the form Lxxx to be stripped. */
2470
2471 static bool
coff_arm_is_local_label_name(bfd * abfd ATTRIBUTE_UNUSED,const char * name)2472 coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
2473 const char * name)
2474 {
2475 #ifdef USER_LABEL_PREFIX
2476 if (USER_LABEL_PREFIX[0] != 0)
2477 {
2478 size_t len = strlen (USER_LABEL_PREFIX);
2479
2480 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2481 return false;
2482 }
2483 #endif
2484
2485 #ifdef LOCAL_LABEL_PREFIX
2486 /* If there is a prefix for local labels then look for this.
2487 If the prefix exists, but it is empty, then ignore the test. */
2488
2489 if (LOCAL_LABEL_PREFIX[0] != 0)
2490 {
2491 size_t len = strlen (LOCAL_LABEL_PREFIX);
2492
2493 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2494 return false;
2495
2496 /* Perform the checks below for the rest of the name. */
2497 name += len;
2498 }
2499 #endif
2500
2501 return name[0] == 'L';
2502 }
2503
2504 /* This piece of machinery exists only to guarantee that the bfd that holds
2505 the glue section is written last.
2506
2507 This does depend on bfd_make_section attaching a new section to the
2508 end of the section list for the bfd. */
2509
2510 static bool
coff_arm_link_output_has_begun(bfd * sub,struct coff_final_link_info * info)2511 coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info)
2512 {
2513 return (sub->output_has_begun
2514 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2515 }
2516
2517 static bool
coff_arm_final_link_postscript(bfd * abfd ATTRIBUTE_UNUSED,struct coff_final_link_info * pfinfo)2518 coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED,
2519 struct coff_final_link_info * pfinfo)
2520 {
2521 struct coff_arm_link_hash_table * globals;
2522
2523 globals = coff_arm_hash_table (pfinfo->info);
2524
2525 BFD_ASSERT (globals != NULL);
2526
2527 if (globals->bfd_of_glue_owner != NULL)
2528 {
2529 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2530 return false;
2531
2532 globals->bfd_of_glue_owner->output_has_begun = true;
2533 }
2534
2535 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2536 }
2537
2538 #ifndef bfd_pe_print_pdata
2539 #define bfd_pe_print_pdata NULL
2540 #endif
2541
2542 #include "coffcode.h"
2543
2544 #ifndef TARGET_LITTLE_SYM
2545 #define TARGET_LITTLE_SYM arm_coff_le_vec
2546 #endif
2547 #ifndef TARGET_LITTLE_NAME
2548 #define TARGET_LITTLE_NAME "coff-arm-little"
2549 #endif
2550 #ifndef TARGET_BIG_SYM
2551 #define TARGET_BIG_SYM arm_coff_be_vec
2552 #endif
2553 #ifndef TARGET_BIG_NAME
2554 #define TARGET_BIG_NAME "coff-arm-big"
2555 #endif
2556
2557 #ifndef TARGET_UNDERSCORE
2558 #define TARGET_UNDERSCORE 0
2559 #endif
2560
2561 #ifndef EXTRA_S_FLAGS
2562 #ifdef COFF_WITH_PE
2563 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2564 #else
2565 #define EXTRA_S_FLAGS SEC_CODE
2566 #endif
2567 #endif
2568
2569 /* Forward declaration for use initialising alternative_target field. */
2570 extern const bfd_target TARGET_BIG_SYM ;
2571
2572 /* Target vectors. */
2573 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2574 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)
2575