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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
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22
23#include "bfd.h"
24#include "sysdep.h"
25#include "libbfd.h"
26
27#include "coff/arm.h"
28
29#include "coff/internal.h"
30
31#ifdef COFF_WITH_PE
32#include "coff/pe.h"
33#endif
34
35#include "libcoff.h"
36
37/* Macros for manipulation the bits in the flags field of the coff data
38 structure. */
39#define APCS_26_FLAG(abfd) \
40 (coff_data (abfd)->flags & F_APCS_26)
41
42#define APCS_FLOAT_FLAG(abfd) \
43 (coff_data (abfd)->flags & F_APCS_FLOAT)
44
45#define PIC_FLAG(abfd) \
46 (coff_data (abfd)->flags & F_PIC)
47
48#define APCS_SET(abfd) \
49 (coff_data (abfd)->flags & F_APCS_SET)
50
51#define SET_APCS_FLAGS(abfd, flgs) \
52 do \
53 { \
54 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
55 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
56 } \
57 while (0)
58
59#define INTERWORK_FLAG(abfd) \
60 (coff_data (abfd)->flags & F_INTERWORK)
61
62#define INTERWORK_SET(abfd) \
63 (coff_data (abfd)->flags & F_INTERWORK_SET)
64
65#define SET_INTERWORK_FLAG(abfd, flg) \
66 do \
67 { \
68 coff_data (abfd)->flags &= ~F_INTERWORK; \
69 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
70 } \
71 while (0)
72
73#ifndef NUM_ELEM
74#define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
75#endif
76
77typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
78/* some typedefs for holding instructions */
79typedef unsigned long int insn32;
80typedef unsigned short int insn16;
81
82 /* Forward declarations for stupid compilers. */
83static bfd_boolean coff_arm_relocate_section
84 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
85 struct internal_reloc *, struct internal_syment *, asection **));
86static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
87 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
88static bfd_reloc_status_type aoutarm_fix_pcrel_26
89 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
90#ifndef ARM_WINCE
91static bfd_reloc_status_type coff_thumb_pcrel_23
92 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
93static bfd_reloc_status_type coff_thumb_pcrel_9
94 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
95static insn32 insert_thumb_branch
96 PARAMS ((insn32, int));
97#endif
98static bfd_reloc_status_type coff_thumb_pcrel_12
99 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
100static bfd_reloc_status_type coff_arm_reloc
101 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
102static bfd_boolean coff_arm_adjust_symndx
103 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
104 asection *, struct internal_reloc *, bfd_boolean *));
105static reloc_howto_type * coff_arm_rtype_to_howto
106 PARAMS ((bfd *, asection *, struct internal_reloc *,
107 struct coff_link_hash_entry *, struct internal_syment *,
108 bfd_vma *));
109static bfd_reloc_status_type coff_thumb_pcrel_common
110 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
111 thumb_pcrel_branchtype));
112static const struct reloc_howto_struct * coff_arm_reloc_type_lookup
113 PARAMS ((bfd *, bfd_reloc_code_real_type));
114static struct bfd_link_hash_table * coff_arm_link_hash_table_create
115 PARAMS ((bfd *));
116static struct coff_link_hash_entry * find_thumb_glue
117 PARAMS ((struct bfd_link_info *, const char *, bfd *));
118static struct coff_link_hash_entry * find_arm_glue
119 PARAMS ((struct bfd_link_info *, const char *, bfd *));
120#ifndef COFF_IMAGE_WITH_PE
121static void record_arm_to_thumb_glue
122 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
123#ifndef ARM_WINCE
124static void record_thumb_to_arm_glue
125 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
126#endif
127#endif
128static bfd_boolean coff_arm_merge_private_bfd_data
129 PARAMS ((bfd *, bfd *));
130static bfd_boolean coff_arm_print_private_bfd_data
131 PARAMS ((bfd *, PTR));
132static bfd_boolean _bfd_coff_arm_set_private_flags
133 PARAMS ((bfd *, flagword));
134static bfd_boolean coff_arm_copy_private_bfd_data
135 PARAMS ((bfd *, bfd *));
136static bfd_boolean coff_arm_is_local_label_name
137 PARAMS ((bfd *, const char *));
138static bfd_boolean coff_arm_link_output_has_begun
139 PARAMS ((bfd *, struct coff_final_link_info *));
140static bfd_boolean coff_arm_final_link_postscript
141 PARAMS ((bfd *, struct coff_final_link_info *));
142static void arm_emit_base_file_entry
143 PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
144
145/* The linker script knows the section names for placement.
146 The entry_names are used to do simple name mangling on the stubs.
147 Given a function name, and its type, the stub can be found. The
148 name can be changed. The only requirement is the %s be present. */
149
150#define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
151#define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
152
153#define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
154#define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
155
156/* Used by the assembler. */
157
158static bfd_reloc_status_type
159coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
160 error_message)
161 bfd *abfd;
162 arelent *reloc_entry;
163 asymbol *symbol ATTRIBUTE_UNUSED;
164 PTR data;
165 asection *input_section ATTRIBUTE_UNUSED;
166 bfd *output_bfd;
167 char **error_message ATTRIBUTE_UNUSED;
168{
169 symvalue diff;
170 if (output_bfd == (bfd *) NULL)
171 return bfd_reloc_continue;
172
173 diff = reloc_entry->addend;
174
175#define DOIT(x) \
176 x = ((x & ~howto->dst_mask) \
177 | (((x & howto->src_mask) + diff) & howto->dst_mask))
178
179 if (diff != 0)
180 {
181 reloc_howto_type *howto = reloc_entry->howto;
182 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
183
184 switch (howto->size)
185 {
186 case 0:
187 {
188 char x = bfd_get_8 (abfd, addr);
189 DOIT (x);
190 bfd_put_8 (abfd, x, addr);
191 }
192 break;
193
194 case 1:
195 {
196 short x = bfd_get_16 (abfd, addr);
197 DOIT (x);
198 bfd_put_16 (abfd, (bfd_vma) x, addr);
199 }
200 break;
201
202 case 2:
203 {
204 long x = bfd_get_32 (abfd, addr);
205 DOIT (x);
206 bfd_put_32 (abfd, (bfd_vma) x, addr);
207 }
208 break;
209
210 default:
211 abort ();
212 }
213 }
214
215 /* Now let bfd_perform_relocation finish everything up. */
216 return bfd_reloc_continue;
217}
218
219/* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
220 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
221 should not. */
222#ifndef TARGET_UNDERSCORE
223#define TARGET_UNDERSCORE '_'
224#endif
225
226#ifndef PCRELOFFSET
227#define PCRELOFFSET TRUE
228#endif
229
230/* These most certainly belong somewhere else. Just had to get rid of
231 the manifest constants in the code. */
232#define ARM_8 0
233#define ARM_16 1
234#define ARM_32 2
235#define ARM_26 3
236#define ARM_DISP8 4
237#define ARM_DISP16 5
238#define ARM_DISP32 6
239#define ARM_26D 7
240/* 8 is unused */
241#define ARM_NEG16 9
242#define ARM_NEG32 10
243#define ARM_RVA32 11
244#define ARM_THUMB9 12
245#define ARM_THUMB12 13
246#define ARM_THUMB23 14
247
248#ifdef ARM_WINCE
249#undef ARM_32
250#undef ARM_RVA32
251#undef ARM_26
252#undef ARM_THUMB12
253#undef ARM_26D
254
255#define ARM_26D 0
256#define ARM_32 1
257#define ARM_RVA32 2
258#define ARM_26 3
259#define ARM_THUMB12 4
260#define ARM_SECTION 14
261#define ARM_SECREL 15
262#endif
263
264static reloc_howto_type aoutarm_std_reloc_howto[] =
265 {
266#ifdef ARM_WINCE
267 HOWTO (ARM_26D,
268 2,
269 2,
270 24,
271 TRUE,
272 0,
273 complain_overflow_dont,
274 aoutarm_fix_pcrel_26_done,
275 "ARM_26D",
276 FALSE,
277 0x00ffffff,
278 0x0,
279 PCRELOFFSET),
280 HOWTO (ARM_32,
281 0,
282 2,
283 32,
284 FALSE,
285 0,
286 complain_overflow_bitfield,
287 coff_arm_reloc,
288 "ARM_32",
289 FALSE,
290 0xffffffff,
291 0xffffffff,
292 PCRELOFFSET),
293 HOWTO (ARM_RVA32,
294 0,
295 2,
296 32,
297 FALSE,
298 0,
299 complain_overflow_bitfield,
300 coff_arm_reloc,
301 "ARM_RVA32",
302 FALSE,
303 0xffffffff,
304 0xffffffff,
305 PCRELOFFSET),
306 HOWTO (ARM_26,
307 2,
308 2,
309 24,
310 TRUE,
311 0,
312 complain_overflow_signed,
313 aoutarm_fix_pcrel_26 ,
314 "ARM_26",
315 FALSE,
316 0x00ffffff,
317 0x00ffffff,
318 PCRELOFFSET),
319 HOWTO (ARM_THUMB12,
320 1,
321 1,
322 11,
323 TRUE,
324 0,
325 complain_overflow_signed,
326 coff_thumb_pcrel_12 ,
327 "ARM_THUMB12",
328 FALSE,
329 0x000007ff,
330 0x000007ff,
331 PCRELOFFSET),
332 EMPTY_HOWTO (-1),
333 EMPTY_HOWTO (-1),
334 EMPTY_HOWTO (-1),
335 EMPTY_HOWTO (-1),
336 EMPTY_HOWTO (-1),
337 EMPTY_HOWTO (-1),
338 EMPTY_HOWTO (-1),
339 EMPTY_HOWTO (-1),
340 EMPTY_HOWTO (-1),
341 HOWTO (ARM_SECTION,
342 0,
343 1,
344 16,
345 FALSE,
346 0,
347 complain_overflow_bitfield,
348 coff_arm_reloc,
349 "ARM_SECTION",
350 FALSE,
351 0x0000ffff,
352 0x0000ffff,
353 PCRELOFFSET),
354 HOWTO (ARM_SECREL,
355 0,
356 2,
357 32,
358 FALSE,
359 0,
360 complain_overflow_bitfield,
361 coff_arm_reloc,
362 "ARM_SECREL",
363 FALSE,
364 0xffffffff,
365 0xffffffff,
366 PCRELOFFSET),
367#else /* not ARM_WINCE */
368 HOWTO (ARM_8, /* type */
369 0, /* rightshift */
370 0, /* size */
371 8, /* bitsize */
372 FALSE, /* pc_relative */
373 0, /* bitpos */
374 complain_overflow_bitfield, /* complain_on_overflow */
375 coff_arm_reloc, /* special_function */
376 "ARM_8", /* name */
377 TRUE, /* partial_inplace */
378 0x000000ff, /* src_mask */
379 0x000000ff, /* dst_mask */
380 PCRELOFFSET /* pcrel_offset */),
381 HOWTO (ARM_16,
382 0,
383 1,
384 16,
385 FALSE,
386 0,
387 complain_overflow_bitfield,
388 coff_arm_reloc,
389 "ARM_16",
390 TRUE,
391 0x0000ffff,
392 0x0000ffff,
393 PCRELOFFSET),
394 HOWTO (ARM_32,
395 0,
396 2,
397 32,
398 FALSE,
399 0,
400 complain_overflow_bitfield,
401 coff_arm_reloc,
402 "ARM_32",
403 TRUE,
404 0xffffffff,
405 0xffffffff,
406 PCRELOFFSET),
407 HOWTO (ARM_26,
408 2,
409 2,
410 24,
411 TRUE,
412 0,
413 complain_overflow_signed,
414 aoutarm_fix_pcrel_26 ,
415 "ARM_26",
416 FALSE,
417 0x00ffffff,
418 0x00ffffff,
419 PCRELOFFSET),
420 HOWTO (ARM_DISP8,
421 0,
422 0,
423 8,
424 TRUE,
425 0,
426 complain_overflow_signed,
427 coff_arm_reloc,
428 "ARM_DISP8",
429 TRUE,
430 0x000000ff,
431 0x000000ff,
432 TRUE),
433 HOWTO (ARM_DISP16,
434 0,
435 1,
436 16,
437 TRUE,
438 0,
439 complain_overflow_signed,
440 coff_arm_reloc,
441 "ARM_DISP16",
442 TRUE,
443 0x0000ffff,
444 0x0000ffff,
445 TRUE),
446 HOWTO (ARM_DISP32,
447 0,
448 2,
449 32,
450 TRUE,
451 0,
452 complain_overflow_signed,
453 coff_arm_reloc,
454 "ARM_DISP32",
455 TRUE,
456 0xffffffff,
457 0xffffffff,
458 TRUE),
459 HOWTO (ARM_26D,
460 2,
461 2,
462 24,
463 FALSE,
464 0,
465 complain_overflow_dont,
466 aoutarm_fix_pcrel_26_done,
467 "ARM_26D",
468 TRUE,
469 0x00ffffff,
470 0x0,
471 FALSE),
472 /* 8 is unused */
473 EMPTY_HOWTO (-1),
474 HOWTO (ARM_NEG16,
475 0,
476 -1,
477 16,
478 FALSE,
479 0,
480 complain_overflow_bitfield,
481 coff_arm_reloc,
482 "ARM_NEG16",
483 TRUE,
484 0x0000ffff,
485 0x0000ffff,
486 FALSE),
487 HOWTO (ARM_NEG32,
488 0,
489 -2,
490 32,
491 FALSE,
492 0,
493 complain_overflow_bitfield,
494 coff_arm_reloc,
495 "ARM_NEG32",
496 TRUE,
497 0xffffffff,
498 0xffffffff,
499 FALSE),
500 HOWTO (ARM_RVA32,
501 0,
502 2,
503 32,
504 FALSE,
505 0,
506 complain_overflow_bitfield,
507 coff_arm_reloc,
508 "ARM_RVA32",
509 TRUE,
510 0xffffffff,
511 0xffffffff,
512 PCRELOFFSET),
513 HOWTO (ARM_THUMB9,
514 1,
515 1,
516 8,
517 TRUE,
518 0,
519 complain_overflow_signed,
520 coff_thumb_pcrel_9 ,
521 "ARM_THUMB9",
522 FALSE,
523 0x000000ff,
524 0x000000ff,
525 PCRELOFFSET),
526 HOWTO (ARM_THUMB12,
527 1,
528 1,
529 11,
530 TRUE,
531 0,
532 complain_overflow_signed,
533 coff_thumb_pcrel_12 ,
534 "ARM_THUMB12",
535 FALSE,
536 0x000007ff,
537 0x000007ff,
538 PCRELOFFSET),
539 HOWTO (ARM_THUMB23,
540 1,
541 2,
542 22,
543 TRUE,
544 0,
545 complain_overflow_signed,
546 coff_thumb_pcrel_23 ,
547 "ARM_THUMB23",
548 FALSE,
549 0x07ff07ff,
550 0x07ff07ff,
551 PCRELOFFSET)
552#endif /* not ARM_WINCE */
553 };
554
555#define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
556
557#ifdef COFF_WITH_PE
558static bfd_boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
559/* Return TRUE if this relocation should
560 appear in the output .reloc section. */
561
562static bfd_boolean
563in_reloc_p (abfd, howto)
564 bfd * abfd ATTRIBUTE_UNUSED;
565 reloc_howto_type * howto;
566{
567 return !howto->pc_relative && howto->type != ARM_RVA32;
568}
569#endif
570
571#define RTYPE2HOWTO(cache_ptr, dst) \
572 (cache_ptr)->howto = \
573 (dst)->r_type < NUM_RELOCS \
574 ? aoutarm_std_reloc_howto + (dst)->r_type \
575 : NULL
576
577#define coff_rtype_to_howto coff_arm_rtype_to_howto
578
579static reloc_howto_type *
580coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
581 bfd *abfd ATTRIBUTE_UNUSED;
582 asection *sec;
583 struct internal_reloc *rel;
584 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
585 struct internal_syment *sym ATTRIBUTE_UNUSED;
586 bfd_vma *addendp;
587{
588 reloc_howto_type * howto;
589
590 if (rel->r_type >= NUM_RELOCS)
591 return NULL;
592
593 howto = aoutarm_std_reloc_howto + rel->r_type;
594
595 if (rel->r_type == ARM_RVA32)
596 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
597
598 return howto;
599}
600
601/* Used by the assembler. */
602
603static bfd_reloc_status_type
604aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
605 output_bfd, error_message)
606 bfd *abfd ATTRIBUTE_UNUSED;
607 arelent *reloc_entry ATTRIBUTE_UNUSED;
608 asymbol *symbol ATTRIBUTE_UNUSED;
609 PTR data ATTRIBUTE_UNUSED;
610 asection *input_section ATTRIBUTE_UNUSED;
611 bfd *output_bfd ATTRIBUTE_UNUSED;
612 char **error_message ATTRIBUTE_UNUSED;
613{
614 /* This is dead simple at present. */
615 return bfd_reloc_ok;
616}
617
618/* Used by the assembler. */
619
620static bfd_reloc_status_type
621aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
622 output_bfd, error_message)
623 bfd *abfd;
624 arelent *reloc_entry;
625 asymbol *symbol;
626 PTR data;
627 asection *input_section;
628 bfd *output_bfd;
629 char **error_message ATTRIBUTE_UNUSED;
630{
631 bfd_vma relocation;
632 bfd_size_type addr = reloc_entry->address;
633 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
634 bfd_reloc_status_type flag = bfd_reloc_ok;
635
636 /* If this is an undefined symbol, return error. */
637 if (symbol->section == &bfd_und_section
638 && (symbol->flags & BSF_WEAK) == 0)
639 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
640
641 /* If the sections are different, and we are doing a partial relocation,
642 just ignore it for now. */
643 if (symbol->section->name != input_section->name
644 && output_bfd != (bfd *)NULL)
645 return bfd_reloc_continue;
646
647 relocation = (target & 0x00ffffff) << 2;
648 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
649 relocation += symbol->value;
650 relocation += symbol->section->output_section->vma;
651 relocation += symbol->section->output_offset;
652 relocation += reloc_entry->addend;
653 relocation -= input_section->output_section->vma;
654 relocation -= input_section->output_offset;
655 relocation -= addr;
656
657 if (relocation & 3)
658 return bfd_reloc_overflow;
659
660 /* Check for overflow. */
661 if (relocation & 0x02000000)
662 {
663 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
664 flag = bfd_reloc_overflow;
665 }
666 else if (relocation & ~(bfd_vma) 0x03ffffff)
667 flag = bfd_reloc_overflow;
668
669 target &= ~0x00ffffff;
670 target |= (relocation >> 2) & 0x00ffffff;
671 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
672
673 /* Now the ARM magic... Change the reloc type so that it is marked as done.
674 Strictly this is only necessary if we are doing a partial relocation. */
675 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
676
677 return flag;
678}
679
680static bfd_reloc_status_type
681coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
682 output_bfd, error_message, btype)
683 bfd *abfd;
684 arelent *reloc_entry;
685 asymbol *symbol;
686 PTR data;
687 asection *input_section;
688 bfd *output_bfd;
689 char **error_message ATTRIBUTE_UNUSED;
690 thumb_pcrel_branchtype btype;
691{
692 bfd_vma relocation = 0;
693 bfd_size_type addr = reloc_entry->address;
694 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
695 bfd_reloc_status_type flag = bfd_reloc_ok;
696 bfd_vma dstmsk;
697 bfd_vma offmsk;
698 bfd_vma signbit;
699
700 /* NOTE: This routine is currently used by GAS, but not by the link
701 phase. */
702
703 switch (btype)
704 {
705 case b9:
706 dstmsk = 0x000000ff;
707 offmsk = 0x000001fe;
708 signbit = 0x00000100;
709 break;
710
711 case b12:
712 dstmsk = 0x000007ff;
713 offmsk = 0x00000ffe;
714 signbit = 0x00000800;
715 break;
716
717 case b23:
718 dstmsk = 0x07ff07ff;
719 offmsk = 0x007fffff;
720 signbit = 0x00400000;
721 break;
722
723 default:
724 abort ();
725 }
726
727 /* If this is an undefined symbol, return error. */
728 if (symbol->section == &bfd_und_section
729 && (symbol->flags & BSF_WEAK) == 0)
730 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
731
732 /* If the sections are different, and we are doing a partial relocation,
733 just ignore it for now. */
734 if (symbol->section->name != input_section->name
735 && output_bfd != (bfd *)NULL)
736 return bfd_reloc_continue;
737
738 switch (btype)
739 {
740 case b9:
741 case b12:
742 relocation = ((target & dstmsk) << 1);
743 break;
744
745 case b23:
746 if (bfd_big_endian (abfd))
747 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
748 else
749 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
750 break;
751
752 default:
753 abort ();
754 }
755
756 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
757 relocation += symbol->value;
758 relocation += symbol->section->output_section->vma;
759 relocation += symbol->section->output_offset;
760 relocation += reloc_entry->addend;
761 relocation -= input_section->output_section->vma;
762 relocation -= input_section->output_offset;
763 relocation -= addr;
764
765 if (relocation & 1)
766 return bfd_reloc_overflow;
767
768 /* Check for overflow. */
769 if (relocation & signbit)
770 {
771 if ((relocation & ~offmsk) != ~offmsk)
772 flag = bfd_reloc_overflow;
773 }
774 else if (relocation & ~offmsk)
775 flag = bfd_reloc_overflow;
776
777 target &= ~dstmsk;
778 switch (btype)
779 {
780 case b9:
781 case b12:
782 target |= (relocation >> 1);
783 break;
784
785 case b23:
786 if (bfd_big_endian (abfd))
787 target |= (((relocation & 0xfff) >> 1)
788 | ((relocation << 4) & 0x07ff0000));
789 else
790 target |= (((relocation & 0xffe) << 15)
791 | ((relocation >> 12) & 0x7ff));
792 break;
793
794 default:
795 abort ();
796 }
797
798 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
799
800 /* Now the ARM magic... Change the reloc type so that it is marked as done.
801 Strictly this is only necessary if we are doing a partial relocation. */
802 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
803
804 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
805 return flag;
806}
807
808#ifndef ARM_WINCE
809static bfd_reloc_status_type
810coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
811 output_bfd, error_message)
812 bfd *abfd;
813 arelent *reloc_entry;
814 asymbol *symbol;
815 PTR data;
816 asection *input_section;
817 bfd *output_bfd;
818 char **error_message;
819{
820 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
821 input_section, output_bfd, error_message,
822 b23);
823}
824
825static bfd_reloc_status_type
826coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
827 output_bfd, error_message)
828 bfd *abfd;
829 arelent *reloc_entry;
830 asymbol *symbol;
831 PTR data;
832 asection *input_section;
833 bfd *output_bfd;
834 char **error_message;
835{
836 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
837 input_section, output_bfd, error_message,
838 b9);
839}
840#endif /* not ARM_WINCE */
841
842static bfd_reloc_status_type
843coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
844 output_bfd, error_message)
845 bfd *abfd;
846 arelent *reloc_entry;
847 asymbol *symbol;
848 PTR data;
849 asection *input_section;
850 bfd *output_bfd;
851 char **error_message;
852{
853 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
854 input_section, output_bfd, error_message,
855 b12);
856}
857
858static const struct reloc_howto_struct *
859coff_arm_reloc_type_lookup (abfd, code)
860 bfd * abfd;
861 bfd_reloc_code_real_type code;
862{
863#define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
864
865 if (code == BFD_RELOC_CTOR)
866 switch (bfd_get_arch_info (abfd)->bits_per_address)
867 {
868 case 32:
869 code = BFD_RELOC_32;
870 break;
871 default:
872 return (const struct reloc_howto_struct *) 0;
873 }
874
875 switch (code)
876 {
877#ifdef ARM_WINCE
878 ASTD (BFD_RELOC_32, ARM_32);
879 ASTD (BFD_RELOC_RVA, ARM_RVA32);
880 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
881 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
882#else
883 ASTD (BFD_RELOC_8, ARM_8);
884 ASTD (BFD_RELOC_16, ARM_16);
885 ASTD (BFD_RELOC_32, ARM_32);
886 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
887 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
888 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
889 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
890 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
891 ASTD (BFD_RELOC_RVA, ARM_RVA32);
892 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
893 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
894 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
895 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
896#endif
897 default: return (const struct reloc_howto_struct *) 0;
898 }
899}
900
901#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
902#define COFF_PAGE_SIZE 0x1000
903/* Turn a howto into a reloc nunmber */
904
905#define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
906#define BADMAG(x) ARMBADMAG(x)
907#define ARM 1 /* Customize coffcode.h */
908
909#ifndef ARM_WINCE
910/* Make sure that the 'r_offset' field is copied properly
911 so that identical binaries will compare the same. */
912#define SWAP_IN_RELOC_OFFSET H_GET_32
913#define SWAP_OUT_RELOC_OFFSET H_PUT_32
914#endif
915
916/* Extend the coff_link_hash_table structure with a few ARM specific fields.
917 This allows us to store global data here without actually creating any
918 global variables, which is a no-no in the BFD world. */
919struct coff_arm_link_hash_table
920 {
921 /* The original coff_link_hash_table structure. MUST be first field. */
922 struct coff_link_hash_table root;
923
924 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
925 bfd_size_type thumb_glue_size;
926
927 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
928 bfd_size_type arm_glue_size;
929
930 /* An arbitrary input BFD chosen to hold the glue sections. */
931 bfd * bfd_of_glue_owner;
932
933 /* Support interworking with old, non-interworking aware ARM code. */
934 int support_old_code;
935};
936
937/* Get the ARM coff linker hash table from a link_info structure. */
938#define coff_arm_hash_table(info) \
939 ((struct coff_arm_link_hash_table *) ((info)->hash))
940
941/* Create an ARM coff linker hash table. */
942
943static struct bfd_link_hash_table *
944coff_arm_link_hash_table_create (abfd)
945 bfd * abfd;
946{
947 struct coff_arm_link_hash_table * ret;
948 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
949
950 ret = (struct coff_arm_link_hash_table *) bfd_malloc (amt);
951 if (ret == (struct coff_arm_link_hash_table *) NULL)
952 return NULL;
953
954 if (! _bfd_coff_link_hash_table_init
955 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
956 {
957 free (ret);
958 return (struct bfd_link_hash_table *) NULL;
959 }
960
961 ret->thumb_glue_size = 0;
962 ret->arm_glue_size = 0;
963 ret->bfd_of_glue_owner = NULL;
964
965 return & ret->root.root;
966}
967
968static void
969arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
970 struct bfd_link_info *info;
971 bfd *output_bfd;
972 asection *input_section;
973 bfd_vma reloc_offset;
974{
975 bfd_vma addr = reloc_offset
976 - input_section->vma
977 + input_section->output_offset
978 + input_section->output_section->vma;
979
980 if (coff_data (output_bfd)->pe)
981 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
982 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
983
984}
985\f
986#ifndef ARM_WINCE
987/* The thumb form of a long branch is a bit finicky, because the offset
988 encoding is split over two fields, each in it's own instruction. They
989 can occur in any order. So given a thumb form of long branch, and an
990 offset, insert the offset into the thumb branch and return finished
991 instruction.
992
993 It takes two thumb instructions to encode the target address. Each has
994 11 bits to invest. The upper 11 bits are stored in one (identified by
995 H-0.. see below), the lower 11 bits are stored in the other (identified
996 by H-1).
997
998 Combine together and shifted left by 1 (it's a half word address) and
999 there you have it.
1000
1001 Op: 1111 = F,
1002 H-0, upper address-0 = 000
1003 Op: 1111 = F,
1004 H-1, lower address-0 = 800
1005
1006 They can be ordered either way, but the arm tools I've seen always put
1007 the lower one first. It probably doesn't matter. krk@cygnus.com
1008
1009 XXX: Actually the order does matter. The second instruction (H-1)
1010 moves the computed address into the PC, so it must be the second one
1011 in the sequence. The problem, however is that whilst little endian code
1012 stores the instructions in HI then LOW order, big endian code does the
1013 reverse. nickc@cygnus.com. */
1014
1015#define LOW_HI_ORDER 0xF800F000
1016#define HI_LOW_ORDER 0xF000F800
1017
1018static insn32
1019insert_thumb_branch (br_insn, rel_off)
1020 insn32 br_insn;
1021 int rel_off;
1022{
1023 unsigned int low_bits;
1024 unsigned int high_bits;
1025
1026 BFD_ASSERT((rel_off & 1) != 1);
1027
1028 rel_off >>= 1; /* half word aligned address */
1029 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
1030 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
1031
1032 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1033 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1034 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1035 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1036 else
1037 /* FIXME: the BFD library should never abort except for internal errors
1038 - it should return an error status. */
1039 abort (); /* Error - not a valid branch instruction form. */
1040
1041 return br_insn;
1042}
1043
1044\f
1045static struct coff_link_hash_entry *
1046find_thumb_glue (info, name, input_bfd)
1047 struct bfd_link_info *info;
1048 const char *name;
1049 bfd *input_bfd;
1050{
1051 char *tmp_name;
1052 struct coff_link_hash_entry *myh;
1053 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1054
1055 tmp_name = (char *) bfd_malloc (amt);
1056
1057 BFD_ASSERT (tmp_name);
1058
1059 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1060
1061 myh = coff_link_hash_lookup
1062 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1063
1064 if (myh == NULL)
1065 /* xgettext:c-format */
1066 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1067 bfd_archive_filename (input_bfd), tmp_name, name);
1068
1069 free (tmp_name);
1070
1071 return myh;
1072}
1073#endif /* not ARM_WINCE */
1074
1075static struct coff_link_hash_entry *
1076find_arm_glue (info, name, input_bfd)
1077 struct bfd_link_info *info;
1078 const char *name;
1079 bfd *input_bfd;
1080{
1081 char *tmp_name;
1082 struct coff_link_hash_entry * myh;
1083 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1084
1085 tmp_name = (char *) bfd_malloc (amt);
1086
1087 BFD_ASSERT (tmp_name);
1088
1089 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1090
1091 myh = coff_link_hash_lookup
1092 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1093
1094 if (myh == NULL)
1095 /* xgettext:c-format */
1096 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1097 bfd_archive_filename (input_bfd), tmp_name, name);
1098
1099 free (tmp_name);
1100
1101 return myh;
1102}
1103
1104/*
1105 ARM->Thumb glue:
1106
1107 .arm
1108 __func_from_arm:
1109 ldr r12, __func_addr
1110 bx r12
1111 __func_addr:
1112 .word func @ behave as if you saw a ARM_32 reloc
1113*/
1114
1115#define ARM2THUMB_GLUE_SIZE 12
1116static const insn32 a2t1_ldr_insn = 0xe59fc000;
1117static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1118static const insn32 a2t3_func_addr_insn = 0x00000001;
1119
1120/*
1121 Thumb->ARM: Thumb->(non-interworking aware) ARM
1122
1123 .thumb .thumb
1124 .align 2 .align 2
1125 __func_from_thumb: __func_from_thumb:
1126 bx pc push {r6, lr}
1127 nop ldr r6, __func_addr
1128 .arm mov lr, pc
1129 __func_change_to_arm: bx r6
1130 b func .arm
1131 __func_back_to_thumb:
1132 ldmia r13! {r6, lr}
1133 bx lr
1134 __func_addr:
1135 .word func
1136*/
1137
1138#define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1139static const insn16 t2a1_bx_pc_insn = 0x4778;
1140static const insn16 t2a2_noop_insn = 0x46c0;
1141static const insn32 t2a3_b_insn = 0xea000000;
1142
1143static const insn16 t2a1_push_insn = 0xb540;
1144static const insn16 t2a2_ldr_insn = 0x4e03;
1145static const insn16 t2a3_mov_insn = 0x46fe;
1146static const insn16 t2a4_bx_insn = 0x4730;
1147static const insn32 t2a5_pop_insn = 0xe8bd4040;
1148static const insn32 t2a6_bx_insn = 0xe12fff1e;
1149
1150/* TODO:
1151 We should really create new local (static) symbols in destination
1152 object for each stub we create. We should also create local
1153 (static) symbols within the stubs when switching between ARM and
1154 Thumb code. This will ensure that the debugger and disassembler
1155 can present a better view of stubs.
1156
1157 We can treat stubs like literal sections, and for the THUMB9 ones
1158 (short addressing range) we should be able to insert the stubs
1159 between sections. i.e. the simplest approach (since relocations
1160 are done on a section basis) is to dump the stubs at the end of
1161 processing a section. That way we can always try and minimise the
1162 offset to and from a stub. However, this does not map well onto
1163 the way that the linker/BFD does its work: mapping all input
1164 sections to output sections via the linker script before doing
1165 all the processing.
1166
1167 Unfortunately it may be easier to just to disallow short range
1168 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1169 only branch-and-link (BL) calls. This will simplify the processing
1170 since we can then put all of the stubs into their own section.
1171
1172 TODO:
1173 On a different subject, rather than complaining when a
1174 branch cannot fit in the number of bits available for the
1175 instruction we should generate a trampoline stub (needed to
1176 address the complete 32bit address space). */
1177
1178/* The standard COFF backend linker does not cope with the special
1179 Thumb BRANCH23 relocation. The alternative would be to split the
1180 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1181 bit simpler simply providing our own relocation driver. */
1182
1183/* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1184 This code is a very slightly modified copy of
1185 _bfd_coff_generic_relocate_section. It would be a much more
1186 maintainable solution to have a MACRO that could be expanded within
1187 _bfd_coff_generic_relocate_section that would only be provided for
1188 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1189 is different from the original. */
1190
1191static bfd_boolean
1192coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1193 contents, relocs, syms, sections)
1194 bfd *output_bfd;
1195 struct bfd_link_info *info;
1196 bfd *input_bfd;
1197 asection *input_section;
1198 bfd_byte *contents;
1199 struct internal_reloc *relocs;
1200 struct internal_syment *syms;
1201 asection **sections;
1202{
1203 struct internal_reloc * rel;
1204 struct internal_reloc * relend;
1205
1206 rel = relocs;
1207 relend = rel + input_section->reloc_count;
1208
1209 for (; rel < relend; rel++)
1210 {
1211 int done = 0;
1212 long symndx;
1213 struct coff_link_hash_entry * h;
1214 struct internal_syment * sym;
1215 bfd_vma addend;
1216 bfd_vma val;
1217 reloc_howto_type * howto;
1218 bfd_reloc_status_type rstat;
1219 bfd_vma h_val;
1220
1221 symndx = rel->r_symndx;
1222
1223 if (symndx == -1)
1224 {
1225 h = NULL;
1226 sym = NULL;
1227 }
1228 else
1229 {
1230 h = obj_coff_sym_hashes (input_bfd)[symndx];
1231 sym = syms + symndx;
1232 }
1233
1234 /* COFF treats common symbols in one of two ways. Either the
1235 size of the symbol is included in the section contents, or it
1236 is not. We assume that the size is not included, and force
1237 the rtype_to_howto function to adjust the addend as needed. */
1238
1239 if (sym != NULL && sym->n_scnum != 0)
1240 addend = - sym->n_value;
1241 else
1242 addend = 0;
1243
1244 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1245 sym, &addend);
1246 if (howto == NULL)
1247 return FALSE;
1248
1249 /* The relocation_section function will skip pcrel_offset relocs
1250 when doing a relocatable link. However, we want to convert
1251 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1252 this case without pcrel_offset set, and adjust the addend to
1253 compensate. 'partial_inplace' is also set, since we want 'done'
1254 relocations to be reflected in section's data. */
1255 if (rel->r_type == ARM_26
1256 && h != NULL
1257 && info->relocatable
1258 && (h->root.type == bfd_link_hash_defined
1259 || h->root.type == bfd_link_hash_defweak)
1260 && (h->root.u.def.section->output_section
1261 == input_section->output_section))
1262 {
1263 static reloc_howto_type fake_arm26_reloc =
1264 HOWTO (ARM_26,
1265 2,
1266 2,
1267 24,
1268 TRUE,
1269 0,
1270 complain_overflow_signed,
1271 aoutarm_fix_pcrel_26 ,
1272 "ARM_26",
1273 TRUE,
1274 0x00ffffff,
1275 0x00ffffff,
1276 FALSE);
1277
1278 addend -= rel->r_vaddr - input_section->vma;
1279#ifdef ARM_WINCE
1280 /* FIXME: I don't know why, but the hack is necessary for correct
1281 generation of bl's instruction offset. */
1282 addend -= 8;
1283#endif
1284 howto = &fake_arm26_reloc;
1285 }
1286
1287#ifdef ARM_WINCE
1288 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1289 the next opcode's pc, so is off by one. */
1290#if 0 /* This appears to have been true for WINCE 2.0, but it is not
1291 true for WINCE 3.0. */
1292 if (howto->pc_relative && !info->relocatable)
1293 addend -= 8;
1294#endif
1295#endif
1296
1297 /* If we are doing a relocatable link, then we can just ignore
1298 a PC relative reloc that is pcrel_offset. It will already
1299 have the correct value. If this is not a relocatable link,
1300 then we should ignore the symbol value. */
1301 if (howto->pc_relative && howto->pcrel_offset)
1302 {
1303 if (info->relocatable)
1304 continue;
1305 /* FIXME - it is not clear which targets need this next test
1306 and which do not. It is known that it is needed for the
1307 VxWorks and EPOC-PE targets, but it is also known that it
1308 was suppressed for other ARM targets. This ought to be
1309 sorted out one day. */
1310#ifdef ARM_COFF_BUGFIX
1311 /* We must not ignore the symbol value. If the symbol is
1312 within the same section, the relocation should have already
1313 been fixed, but if it is not, we'll be handed a reloc into
1314 the beginning of the symbol's section, so we must not cancel
1315 out the symbol's value, otherwise we'll be adding it in
1316 twice. */
1317 if (sym != NULL && sym->n_scnum != 0)
1318 addend += sym->n_value;
1319#endif
1320 }
1321
1322 val = 0;
1323
1324 if (h == NULL)
1325 {
1326 asection *sec;
1327
1328 if (symndx == -1)
1329 {
1330 sec = bfd_abs_section_ptr;
1331 val = 0;
1332 }
1333 else
1334 {
1335 sec = sections[symndx];
1336 val = (sec->output_section->vma
1337 + sec->output_offset
1338 + sym->n_value
1339 - sec->vma);
1340 }
1341 }
1342 else
1343 {
1344#if 1 /* THUMBEXTENSION */
1345 /* We don't output the stubs if we are generating a
1346 relocatable output file, since we may as well leave the
1347 stub generation to the final linker pass. If we fail to
1348 verify that the name is defined, we'll try to build stubs
1349 for an undefined name... */
1350 if (! info->relocatable
1351 && ( h->root.type == bfd_link_hash_defined
1352 || h->root.type == bfd_link_hash_defweak))
1353 {
1354 asection * h_sec = h->root.u.def.section;
1355 const char * name = h->root.root.string;
1356
1357 /* h locates the symbol referenced in the reloc. */
1358 h_val = (h->root.u.def.value
1359 + h_sec->output_section->vma
1360 + h_sec->output_offset);
1361
1362 if (howto->type == ARM_26)
1363 {
1364 if ( h->class == C_THUMBSTATFUNC
1365 || h->class == C_THUMBEXTFUNC)
1366 {
1367 /* Arm code calling a Thumb function. */
1368 unsigned long int tmp;
1369 bfd_vma my_offset;
1370 asection * s;
1371 long int ret_offset;
1372 struct coff_link_hash_entry * myh;
1373 struct coff_arm_link_hash_table * globals;
1374
1375 myh = find_arm_glue (info, name, input_bfd);
1376 if (myh == NULL)
1377 return FALSE;
1378
1379 globals = coff_arm_hash_table (info);
1380
1381 BFD_ASSERT (globals != NULL);
1382 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1383
1384 my_offset = myh->root.u.def.value;
1385
1386 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1387 ARM2THUMB_GLUE_SECTION_NAME);
1388 BFD_ASSERT (s != NULL);
1389 BFD_ASSERT (s->contents != NULL);
1390 BFD_ASSERT (s->output_section != NULL);
1391
1392 if ((my_offset & 0x01) == 0x01)
1393 {
1394 if (h_sec->owner != NULL
1395 && INTERWORK_SET (h_sec->owner)
1396 && ! INTERWORK_FLAG (h_sec->owner))
1397 {
1398 _bfd_error_handler
1399 /* xgettext:c-format */
1400 (_("%s(%s): warning: interworking not enabled."),
1401 bfd_archive_filename (h_sec->owner), name);
1402 _bfd_error_handler
1403 /* xgettext:c-format */
1404 (_(" first occurrence: %s: arm call to thumb"),
1405 bfd_archive_filename (input_bfd));
1406 }
1407
1408 --my_offset;
1409 myh->root.u.def.value = my_offset;
1410
1411 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1412 s->contents + my_offset);
1413
1414 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1415 s->contents + my_offset + 4);
1416
1417 /* It's a thumb address. Add the low order bit. */
1418 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1419 s->contents + my_offset + 8);
1420
1421 if (info->base_file)
1422 arm_emit_base_file_entry (info, output_bfd, s,
1423 my_offset + 8);
1424
1425 }
1426
1427 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1428
1429 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1430 - input_section->vma);
1431
1432 tmp = tmp & 0xFF000000;
1433
1434 /* Somehow these are both 4 too far, so subtract 8. */
1435 ret_offset =
1436 s->output_offset
1437 + my_offset
1438 + s->output_section->vma
1439 - (input_section->output_offset
1440 + input_section->output_section->vma
1441 + rel->r_vaddr)
1442 - 8;
1443
1444 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1445
1446 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1447 contents + rel->r_vaddr - input_section->vma);
1448 done = 1;
1449 }
1450 }
1451
1452#ifndef ARM_WINCE
1453 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1454 else if (howto->type == ARM_THUMB23)
1455 {
1456 if ( h->class == C_EXT
1457 || h->class == C_STAT
1458 || h->class == C_LABEL)
1459 {
1460 /* Thumb code calling an ARM function */
1461 asection * s = 0;
1462 bfd_vma my_offset;
1463 unsigned long int tmp;
1464 long int ret_offset;
1465 struct coff_link_hash_entry * myh;
1466 struct coff_arm_link_hash_table * globals;
1467
1468 myh = find_thumb_glue (info, name, input_bfd);
1469 if (myh == NULL)
1470 return FALSE;
1471
1472 globals = coff_arm_hash_table (info);
1473
1474 BFD_ASSERT (globals != NULL);
1475 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1476
1477 my_offset = myh->root.u.def.value;
1478
1479 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1480 THUMB2ARM_GLUE_SECTION_NAME);
1481
1482 BFD_ASSERT (s != NULL);
1483 BFD_ASSERT (s->contents != NULL);
1484 BFD_ASSERT (s->output_section != NULL);
1485
1486 if ((my_offset & 0x01) == 0x01)
1487 {
1488 if (h_sec->owner != NULL
1489 && INTERWORK_SET (h_sec->owner)
1490 && ! INTERWORK_FLAG (h_sec->owner)
1491 && ! globals->support_old_code)
1492 {
1493 _bfd_error_handler
1494 /* xgettext:c-format */
1495 (_("%s(%s): warning: interworking not enabled."),
1496 bfd_archive_filename (h_sec->owner), name);
1497 _bfd_error_handler
1498 /* xgettext:c-format */
1499 (_(" first occurrence: %s: thumb call to arm"),
1500 bfd_archive_filename (input_bfd));
1501 _bfd_error_handler
1502 (_(" consider relinking with --support-old-code enabled"));
1503 }
1504
1505 -- my_offset;
1506 myh->root.u.def.value = my_offset;
1507
1508 if (globals->support_old_code)
1509 {
1510 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1511 s->contents + my_offset);
1512
1513 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1514 s->contents + my_offset + 2);
1515
1516 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1517 s->contents + my_offset + 4);
1518
1519 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1520 s->contents + my_offset + 6);
1521
1522 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1523 s->contents + my_offset + 8);
1524
1525 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1526 s->contents + my_offset + 12);
1527
1528 /* Store the address of the function in the last word of the stub. */
1529 bfd_put_32 (output_bfd, h_val,
1530 s->contents + my_offset + 16);
1531
1532 if (info->base_file)
1533 arm_emit_base_file_entry (info, output_bfd, s,
1534 my_offset + 16);
1535 }
1536 else
1537 {
1538 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1539 s->contents + my_offset);
1540
1541 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1542 s->contents + my_offset + 2);
1543
1544 ret_offset =
1545 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1546 - ((bfd_signed_vma)
1547 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1548 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1549 + s->output_section->vma) /* Address of the start of the current section. */
1550 + 4 /* The branch instruction is 4 bytes into the stub. */
1551 + 8); /* ARM branches work from the pc of the instruction + 8. */
1552
1553 bfd_put_32 (output_bfd,
1554 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1555 s->contents + my_offset + 4);
1556
1557 }
1558 }
1559
1560 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1561
1562 /* Now go back and fix up the original BL insn to point
1563 to here. */
1564 ret_offset =
1565 s->output_offset
1566 + my_offset
1567 - (input_section->output_offset
1568 + rel->r_vaddr)
1569 -4;
1570
1571 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1572 - input_section->vma);
1573
1574 bfd_put_32 (output_bfd,
1575 (bfd_vma) insert_thumb_branch (tmp,
1576 ret_offset),
1577 contents + rel->r_vaddr - input_section->vma);
1578
1579 done = 1;
1580 }
1581 }
1582#endif
1583 }
1584
1585 /* If the relocation type and destination symbol does not
1586 fall into one of the above categories, then we can just
1587 perform a direct link. */
1588
1589 if (done)
1590 rstat = bfd_reloc_ok;
1591 else
1592#endif /* THUMBEXTENSION */
1593 if ( h->root.type == bfd_link_hash_defined
1594 || h->root.type == bfd_link_hash_defweak)
1595 {
1596 asection *sec;
1597
1598 sec = h->root.u.def.section;
1599 val = (h->root.u.def.value
1600 + sec->output_section->vma
1601 + sec->output_offset);
1602 }
1603
1604 else if (! info->relocatable)
1605 {
1606 if (! ((*info->callbacks->undefined_symbol)
1607 (info, h->root.root.string, input_bfd, input_section,
1608 rel->r_vaddr - input_section->vma, TRUE)))
1609 return FALSE;
1610 }
1611 }
1612
1613 if (info->base_file)
1614 {
1615 /* Emit a reloc if the backend thinks it needs it. */
1616 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1617 arm_emit_base_file_entry (info, output_bfd, input_section,
1618 rel->r_vaddr);
1619 }
1620
1621#if 1 /* THUMBEXTENSION */
1622 if (done)
1623 rstat = bfd_reloc_ok;
1624#ifndef ARM_WINCE
1625 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1626 else if (! info->relocatable
1627 && howto->type == ARM_THUMB23)
1628 {
1629 /* This is pretty much a copy of what the default
1630 _bfd_final_link_relocate and _bfd_relocate_contents
1631 routines do to perform a relocation, with special
1632 processing for the split addressing of the Thumb BL
1633 instruction. Again, it would probably be simpler adding a
1634 ThumbBRANCH23 specific macro expansion into the default
1635 code. */
1636
1637 bfd_vma address = rel->r_vaddr - input_section->vma;
1638
1639 if (address > input_section->_raw_size)
1640 rstat = bfd_reloc_outofrange;
1641 else
1642 {
1643 bfd_vma relocation = val + addend;
1644 int size = bfd_get_reloc_size (howto);
1645 bfd_boolean overflow = FALSE;
1646 bfd_byte *location = contents + address;
1647 bfd_vma x = bfd_get_32 (input_bfd, location);
1648 bfd_vma src_mask = 0x007FFFFE;
1649 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1650 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1651 bfd_vma check;
1652 bfd_signed_vma signed_check;
1653 bfd_vma add;
1654 bfd_signed_vma signed_add;
1655
1656 BFD_ASSERT (size == 4);
1657
1658 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1659 relocation -= (input_section->output_section->vma
1660 + input_section->output_offset);
1661
1662 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1663 relocation -= address;
1664
1665 /* No need to negate the relocation with BRANCH23. */
1666 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1667 /* howto->rightshift == 1 */
1668
1669 /* Drop unwanted bits from the value we are relocating to. */
1670 check = relocation >> howto->rightshift;
1671
1672 /* If this is a signed value, the rightshift just dropped
1673 leading 1 bits (assuming twos complement). */
1674 if ((bfd_signed_vma) relocation >= 0)
1675 signed_check = check;
1676 else
1677 signed_check = (check
1678 | ((bfd_vma) - 1
1679 & ~((bfd_vma) - 1 >> howto->rightshift)));
1680
1681 /* Get the value from the object file. */
1682 if (bfd_big_endian (input_bfd))
1683 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1684 else
1685 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1686
1687 /* Get the value from the object file with an appropriate sign.
1688 The expression involving howto->src_mask isolates the upper
1689 bit of src_mask. If that bit is set in the value we are
1690 adding, it is negative, and we subtract out that number times
1691 two. If src_mask includes the highest possible bit, then we
1692 can not get the upper bit, but that does not matter since
1693 signed_add needs no adjustment to become negative in that
1694 case. */
1695 signed_add = add;
1696
1697 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1698 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1699
1700 /* howto->bitpos == 0 */
1701 /* Add the value from the object file, shifted so that it is a
1702 straight number. */
1703 signed_check += signed_add;
1704 relocation += signed_add;
1705
1706 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1707
1708 /* Assumes two's complement. */
1709 if ( signed_check > reloc_signed_max
1710 || signed_check < reloc_signed_min)
1711 overflow = TRUE;
1712
1713 /* Put the relocation into the correct bits.
1714 For a BLX instruction, make sure that the relocation is rounded up
1715 to a word boundary. This follows the semantics of the instruction
1716 which specifies that bit 1 of the target address will come from bit
1717 1 of the base address. */
1718 if (bfd_big_endian (input_bfd))
1719 {
1720 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1721 relocation += 2;
1722 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1723 }
1724 else
1725 {
1726 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1727 relocation += 2;
1728 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1729 }
1730
1731 /* Add the relocation to the correct bits of X. */
1732 x = ((x & ~howto->dst_mask) | relocation);
1733
1734 /* Put the relocated value back in the object file. */
1735 bfd_put_32 (input_bfd, x, location);
1736
1737 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1738 }
1739 }
1740#endif
1741 else
1742#endif /* THUMBEXTENSION */
1743 if (info->relocatable && ! howto->partial_inplace)
1744 rstat = bfd_reloc_ok;
1745 else
1746 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1747 contents,
1748 rel->r_vaddr - input_section->vma,
1749 val, addend);
1750#if 1 /* THUMBEXTENSION */
1751 /* FIXME:
1752 Is this the best way to fix up thumb addresses? krk@cygnus.com
1753 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1754 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1755 if (! info->relocatable
1756 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1757 {
1758 /* Determine if we need to set the bottom bit of a relocated address
1759 because the address is the address of a Thumb code symbol. */
1760
1761 int patchit = FALSE;
1762
1763 if (h != NULL
1764 && ( h->class == C_THUMBSTATFUNC
1765 || h->class == C_THUMBEXTFUNC))
1766 {
1767 patchit = TRUE;
1768 }
1769 else if (sym != NULL
1770 && sym->n_scnum > N_UNDEF)
1771 {
1772 /* No hash entry - use the symbol instead. */
1773
1774 if ( sym->n_sclass == C_THUMBSTATFUNC
1775 || sym->n_sclass == C_THUMBEXTFUNC)
1776 patchit = TRUE;
1777 }
1778
1779 if (patchit)
1780 {
1781 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1782 bfd_vma x = bfd_get_32 (input_bfd, location);
1783
1784 bfd_put_32 (input_bfd, x | 1, location);
1785 }
1786 }
1787#endif /* THUMBEXTENSION */
1788
1789 switch (rstat)
1790 {
1791 default:
1792 abort ();
1793 case bfd_reloc_ok:
1794 break;
1795 case bfd_reloc_outofrange:
1796 (*_bfd_error_handler)
1797 (_("%s: bad reloc address 0x%lx in section `%s'"),
1798 bfd_archive_filename (input_bfd),
1799 (unsigned long) rel->r_vaddr,
1800 bfd_get_section_name (input_bfd, input_section));
1801 return FALSE;
1802 case bfd_reloc_overflow:
1803 {
1804 const char *name;
1805 char buf[SYMNMLEN + 1];
1806
1807 if (symndx == -1)
1808 name = "*ABS*";
1809 else if (h != NULL)
1810 name = h->root.root.string;
1811 else
1812 {
1813 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1814 if (name == NULL)
1815 return FALSE;
1816 }
1817
1818 if (! ((*info->callbacks->reloc_overflow)
1819 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1820 input_section, rel->r_vaddr - input_section->vma)))
1821 return FALSE;
1822 }
1823 }
1824 }
1825
1826 return TRUE;
1827}
1828
1829#ifndef COFF_IMAGE_WITH_PE
1830
1831bfd_boolean
1832bfd_arm_allocate_interworking_sections (info)
1833 struct bfd_link_info * info;
1834{
1835 asection * s;
1836 bfd_byte * foo;
1837 struct coff_arm_link_hash_table * globals;
1838#if 0
1839 static char test_char = '1';
1840#endif
1841
1842 globals = coff_arm_hash_table (info);
1843
1844 BFD_ASSERT (globals != NULL);
1845
1846 if (globals->arm_glue_size != 0)
1847 {
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 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1856 globals->arm_glue_size);
1857#if 0
1858 memset (foo, test_char, (size_t) globals->arm_glue_size);
1859#endif
1860
1861 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1862 s->contents = foo;
1863 }
1864
1865 if (globals->thumb_glue_size != 0)
1866 {
1867 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1868
1869 s = bfd_get_section_by_name
1870 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1871
1872 BFD_ASSERT (s != NULL);
1873
1874 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1875 globals->thumb_glue_size);
1876#if 0
1877 memset (foo, test_char, (size_t) globals->thumb_glue_size);
1878#endif
1879
1880 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1881 s->contents = foo;
1882 }
1883
1884 return TRUE;
1885}
1886
1887static void
1888record_arm_to_thumb_glue (info, h)
1889 struct bfd_link_info * info;
1890 struct coff_link_hash_entry * h;
1891{
1892 const char * name = h->root.root.string;
1893 register 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 bfd_size_type 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, ARM2THUMB_GLUE_SECTION_NAME);
1908
1909 BFD_ASSERT (s != NULL);
1910
1911 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1912 tmp_name = (char *) bfd_malloc (amt);
1913
1914 BFD_ASSERT (tmp_name);
1915
1916 sprintf (tmp_name, ARM2THUMB_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 return; /* we've already seen this guy */
1925 }
1926
1927 /* The only trick here is using globals->arm_glue_size as the value. Even
1928 though the section isn't allocated yet, this is where we will be putting
1929 it. */
1930
1931 bh = NULL;
1932 val = globals->arm_glue_size + 1;
1933 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1934 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1935
1936 free (tmp_name);
1937
1938 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1939
1940 return;
1941}
1942
1943#ifndef ARM_WINCE
1944static void
1945record_thumb_to_arm_glue (info, h)
1946 struct bfd_link_info * info;
1947 struct coff_link_hash_entry * h;
1948{
1949 const char * name = h->root.root.string;
1950 register asection * s;
1951 char * tmp_name;
1952 struct coff_link_hash_entry * myh;
1953 struct bfd_link_hash_entry * bh;
1954 struct coff_arm_link_hash_table * globals;
1955 bfd_vma val;
1956 bfd_size_type amt;
1957
1958 globals = coff_arm_hash_table (info);
1959
1960 BFD_ASSERT (globals != NULL);
1961 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1962
1963 s = bfd_get_section_by_name
1964 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1965
1966 BFD_ASSERT (s != NULL);
1967
1968 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1969 tmp_name = (char *) bfd_malloc (amt);
1970
1971 BFD_ASSERT (tmp_name);
1972
1973 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1974
1975 myh = coff_link_hash_lookup
1976 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1977
1978 if (myh != NULL)
1979 {
1980 free (tmp_name);
1981 return; /* we've already seen this guy */
1982 }
1983
1984 bh = NULL;
1985 val = globals->thumb_glue_size + 1;
1986 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1987 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1988
1989 /* If we mark it 'thumb', the disassembler will do a better job. */
1990 myh = (struct coff_link_hash_entry *) bh;
1991 myh->class = C_THUMBEXTFUNC;
1992
1993 free (tmp_name);
1994
1995 /* Allocate another symbol to mark where we switch to arm mode. */
1996
1997#define CHANGE_TO_ARM "__%s_change_to_arm"
1998#define BACK_FROM_ARM "__%s_back_from_arm"
1999
2000 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
2001 tmp_name = (char *) bfd_malloc (amt);
2002
2003 BFD_ASSERT (tmp_name);
2004
2005 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
2006
2007 bh = NULL;
2008 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
2009 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
2010 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
2011
2012 free (tmp_name);
2013
2014 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
2015
2016 return;
2017}
2018#endif /* not ARM_WINCE */
2019
2020/* Select a BFD to be used to hold the sections used by the glue code.
2021 This function is called from the linker scripts in ld/emultempl/
2022 {armcoff/pe}.em */
2023
2024bfd_boolean
2025bfd_arm_get_bfd_for_interworking (abfd, info)
2026 bfd * abfd;
2027 struct bfd_link_info * info;
2028{
2029 struct coff_arm_link_hash_table * globals;
2030 flagword flags;
2031 asection * sec;
2032
2033 /* If we are only performing a partial link do not bother
2034 getting a bfd to hold the glue. */
2035 if (info->relocatable)
2036 return TRUE;
2037
2038 globals = coff_arm_hash_table (info);
2039
2040 BFD_ASSERT (globals != NULL);
2041
2042 if (globals->bfd_of_glue_owner != NULL)
2043 return TRUE;
2044
2045 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2046
2047 if (sec == NULL)
2048 {
2049 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2050
2051 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2052
2053 if (sec == NULL
2054 || ! bfd_set_section_flags (abfd, sec, flags)
2055 || ! bfd_set_section_alignment (abfd, sec, 2))
2056 return FALSE;
2057 }
2058
2059 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2060
2061 if (sec == NULL)
2062 {
2063 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2064
2065 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2066
2067 if (sec == NULL
2068 || ! bfd_set_section_flags (abfd, sec, flags)
2069 || ! bfd_set_section_alignment (abfd, sec, 2))
2070 return FALSE;
2071 }
2072
2073 /* Save the bfd for later use. */
2074 globals->bfd_of_glue_owner = abfd;
2075
2076 return TRUE;
2077}
2078
2079bfd_boolean
2080bfd_arm_process_before_allocation (abfd, info, support_old_code)
2081 bfd * abfd;
2082 struct bfd_link_info * info;
2083 int support_old_code;
2084{
2085 asection * sec;
2086 struct coff_arm_link_hash_table * globals;
2087
2088 /* If we are only performing a partial link do not bother
2089 to construct any glue. */
2090 if (info->relocatable)
2091 return TRUE;
2092
2093 /* Here we have a bfd that is to be included on the link. We have a hook
2094 to do reloc rummaging, before section sizes are nailed down. */
2095
2096 _bfd_coff_get_external_symbols (abfd);
2097
2098 globals = coff_arm_hash_table (info);
2099
2100 BFD_ASSERT (globals != NULL);
2101 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2102
2103 globals->support_old_code = support_old_code;
2104
2105 /* Rummage around all the relocs and map the glue vectors. */
2106 sec = abfd->sections;
2107
2108 if (sec == NULL)
2109 return TRUE;
2110
2111 for (; sec != NULL; sec = sec->next)
2112 {
2113 struct internal_reloc * i;
2114 struct internal_reloc * rel;
2115
2116 if (sec->reloc_count == 0)
2117 continue;
2118
2119 /* Load the relocs. */
2120 /* FIXME: there may be a storage leak here. */
2121
2122 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2123
2124 BFD_ASSERT (i != 0);
2125
2126 for (rel = i; rel < i + sec->reloc_count; ++rel)
2127 {
2128 unsigned short r_type = rel->r_type;
2129 long symndx;
2130 struct coff_link_hash_entry * h;
2131
2132 symndx = rel->r_symndx;
2133
2134 /* If the relocation is not against a symbol it cannot concern us. */
2135 if (symndx == -1)
2136 continue;
2137
2138 /* If the index is outside of the range of our table, something has gone wrong. */
2139 if (symndx >= obj_conv_table_size (abfd))
2140 {
2141 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2142 bfd_archive_filename (abfd), symndx);
2143 continue;
2144 }
2145
2146 h = obj_coff_sym_hashes (abfd)[symndx];
2147
2148 /* If the relocation is against a static symbol it must be within
2149 the current section and so cannot be a cross ARM/Thumb relocation. */
2150 if (h == NULL)
2151 continue;
2152
2153 switch (r_type)
2154 {
2155 case ARM_26:
2156 /* This one is a call from arm code. We need to look up
2157 the target of the call. If it is a thumb target, we
2158 insert glue. */
2159
2160 if (h->class == C_THUMBEXTFUNC)
2161 record_arm_to_thumb_glue (info, h);
2162 break;
2163
2164#ifndef ARM_WINCE
2165 case ARM_THUMB23:
2166 /* This one is a call from thumb code. We used to look
2167 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2168 up the target of the call. If it is an arm target, we
2169 insert glue. If the symbol does not exist it will be
2170 given a class of C_EXT and so we will generate a stub
2171 for it. This is not really a problem, since the link
2172 is doomed anyway. */
2173
2174 switch (h->class)
2175 {
2176 case C_EXT:
2177 case C_STAT:
2178 case C_LABEL:
2179 record_thumb_to_arm_glue (info, h);
2180 break;
2181 default:
2182 ;
2183 }
2184 break;
2185#endif
2186
2187 default:
2188 break;
2189 }
2190 }
2191 }
2192
2193 return TRUE;
2194}
2195
2196#endif /* ! defined (COFF_IMAGE_WITH_PE) */
2197
2198#define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2199#define coff_relocate_section coff_arm_relocate_section
2200#define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2201#define coff_adjust_symndx coff_arm_adjust_symndx
2202#define coff_link_output_has_begun coff_arm_link_output_has_begun
2203#define coff_final_link_postscript coff_arm_final_link_postscript
2204#define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2205#define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2206#define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2207#define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2208#define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2209
2210/* When doing a relocatable link, we want to convert ARM_26 relocs
2211 into ARM_26D relocs. */
2212
2213static bfd_boolean
2214coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2215 bfd *obfd ATTRIBUTE_UNUSED;
2216 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2217 bfd *ibfd;
2218 asection *sec;
2219 struct internal_reloc *irel;
2220 bfd_boolean *adjustedp;
2221{
2222 if (irel->r_type == ARM_26)
2223 {
2224 struct coff_link_hash_entry *h;
2225
2226 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2227 if (h != NULL
2228 && (h->root.type == bfd_link_hash_defined
2229 || h->root.type == bfd_link_hash_defweak)
2230 && h->root.u.def.section->output_section == sec->output_section)
2231 irel->r_type = ARM_26D;
2232 }
2233 *adjustedp = FALSE;
2234 return TRUE;
2235}
2236
2237/* Called when merging the private data areas of two BFDs.
2238 This is important as it allows us to detect if we are
2239 attempting to merge binaries compiled for different ARM
2240 targets, eg different CPUs or different APCS's. */
2241
2242static bfd_boolean
2243coff_arm_merge_private_bfd_data (ibfd, obfd)
2244 bfd * ibfd;
2245 bfd * obfd;
2246{
2247 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2248
2249 if (ibfd == obfd)
2250 return TRUE;
2251
2252 /* If the two formats are different we cannot merge anything.
2253 This is not an error, since it is permissable to change the
2254 input and output formats. */
2255 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2256 || obfd->xvec->flavour != bfd_target_coff_flavour)
2257 return TRUE;
2258
2259 /* Determine what should happen if the input ARM architecture
2260 does not match the output ARM architecture. */
2261 if (! bfd_arm_merge_machines (ibfd, obfd))
2262 return FALSE;
2263
2264 /* Verify that the APCS is the same for the two BFDs. */
2265 if (APCS_SET (ibfd))
2266 {
2267 if (APCS_SET (obfd))
2268 {
2269 /* If the src and dest have different APCS flag bits set, fail. */
2270 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2271 {
2272 _bfd_error_handler
2273 /* xgettext: c-format */
2274 (_("ERROR: %s is compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2275 bfd_archive_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2276 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2277 );
2278
2279 bfd_set_error (bfd_error_wrong_format);
2280 return FALSE;
2281 }
2282
2283 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2284 {
2285 const char *msg;
2286
2287 if (APCS_FLOAT_FLAG (ibfd))
2288 /* xgettext: c-format */
2289 msg = _("ERROR: %s passes floats in float registers, whereas %s passes them in integer registers");
2290 else
2291 /* xgettext: c-format */
2292 msg = _("ERROR: %s passes floats in integer registers, whereas %s passes them in float registers");
2293
2294 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2295 bfd_get_filename (obfd));
2296
2297 bfd_set_error (bfd_error_wrong_format);
2298 return FALSE;
2299 }
2300
2301 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2302 {
2303 const char * msg;
2304
2305 if (PIC_FLAG (ibfd))
2306 /* xgettext: c-format */
2307 msg = _("ERROR: %s is compiled as position independent code, whereas target %s is absolute position");
2308 else
2309 /* xgettext: c-format */
2310 msg = _("ERROR: %s is compiled as absolute position code, whereas target %s is position independent");
2311 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2312 bfd_get_filename (obfd));
2313
2314 bfd_set_error (bfd_error_wrong_format);
2315 return FALSE;
2316 }
2317 }
2318 else
2319 {
2320 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2321
2322 /* Set up the arch and fields as well as these are probably wrong. */
2323 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2324 }
2325 }
2326
2327 /* Check the interworking support. */
2328 if (INTERWORK_SET (ibfd))
2329 {
2330 if (INTERWORK_SET (obfd))
2331 {
2332 /* If the src and dest differ in their interworking issue a warning. */
2333 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2334 {
2335 const char * msg;
2336
2337 if (INTERWORK_FLAG (ibfd))
2338 /* xgettext: c-format */
2339 msg = _("Warning: %s supports interworking, whereas %s does not");
2340 else
2341 /* xgettext: c-format */
2342 msg = _("Warning: %s does not support interworking, whereas %s does");
2343
2344 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2345 bfd_get_filename (obfd));
2346 }
2347 }
2348 else
2349 {
2350 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2351 }
2352 }
2353
2354 return TRUE;
2355}
2356
2357/* Display the flags field. */
2358
2359static bfd_boolean
2360coff_arm_print_private_bfd_data (abfd, ptr)
2361 bfd * abfd;
2362 PTR ptr;
2363{
2364 FILE * file = (FILE *) ptr;
2365
2366 BFD_ASSERT (abfd != NULL && ptr != NULL);
2367
2368 /* xgettext:c-format */
2369 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2370
2371 if (APCS_SET (abfd))
2372 {
2373 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2374 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2375
2376 if (APCS_FLOAT_FLAG (abfd))
2377 fprintf (file, _(" [floats passed in float registers]"));
2378 else
2379 fprintf (file, _(" [floats passed in integer registers]"));
2380
2381 if (PIC_FLAG (abfd))
2382 fprintf (file, _(" [position independent]"));
2383 else
2384 fprintf (file, _(" [absolute position]"));
2385 }
2386
2387 if (! INTERWORK_SET (abfd))
2388 fprintf (file, _(" [interworking flag not initialised]"));
2389 else if (INTERWORK_FLAG (abfd))
2390 fprintf (file, _(" [interworking supported]"));
2391 else
2392 fprintf (file, _(" [interworking not supported]"));
2393
2394 fputc ('\n', file);
2395
2396 return TRUE;
2397}
2398
2399/* Copies the given flags into the coff_tdata.flags field.
2400 Typically these flags come from the f_flags[] field of
2401 the COFF filehdr structure, which contains important,
2402 target specific information.
2403 Note: Although this function is static, it is explicitly
2404 called from both coffcode.h and peicode.h. */
2405
2406static bfd_boolean
2407_bfd_coff_arm_set_private_flags (abfd, flags)
2408 bfd * abfd;
2409 flagword flags;
2410{
2411 flagword flag;
2412
2413 BFD_ASSERT (abfd != NULL);
2414
2415 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2416
2417 /* Make sure that the APCS field has not been initialised to the opposite
2418 value. */
2419 if (APCS_SET (abfd)
2420 && ( (APCS_26_FLAG (abfd) != flag)
2421 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2422 || (PIC_FLAG (abfd) != (flags & F_PIC))
2423 ))
2424 return FALSE;
2425
2426 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2427
2428 SET_APCS_FLAGS (abfd, flag);
2429
2430 flag = (flags & F_INTERWORK);
2431
2432 /* If the BFD has already had its interworking flag set, but it
2433 is different from the value that we have been asked to set,
2434 then assume that that merged code will not support interworking
2435 and set the flag accordingly. */
2436 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2437 {
2438 if (flag)
2439 /* xgettext: c-format */
2440 _bfd_error_handler (_("Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"),
2441 bfd_archive_filename (abfd));
2442 else
2443 /* xgettext: c-format */
2444 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2445 bfd_archive_filename (abfd));
2446 flag = 0;
2447 }
2448
2449 SET_INTERWORK_FLAG (abfd, flag);
2450
2451 return TRUE;
2452}
2453
2454/* Copy the important parts of the target specific data
2455 from one instance of a BFD to another. */
2456
2457static bfd_boolean
2458coff_arm_copy_private_bfd_data (src, dest)
2459 bfd * src;
2460 bfd * dest;
2461{
2462 BFD_ASSERT (src != NULL && dest != NULL);
2463
2464 if (src == dest)
2465 return TRUE;
2466
2467 /* If the destination is not in the same format as the source, do not do
2468 the copy. */
2469 if (src->xvec != dest->xvec)
2470 return TRUE;
2471
2472 /* copy the flags field */
2473 if (APCS_SET (src))
2474 {
2475 if (APCS_SET (dest))
2476 {
2477 /* If the src and dest have different APCS flag bits set, fail. */
2478 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2479 return FALSE;
2480
2481 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2482 return FALSE;
2483
2484 if (PIC_FLAG (dest) != PIC_FLAG (src))
2485 return FALSE;
2486 }
2487 else
2488 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2489 | PIC_FLAG (src));
2490 }
2491
2492 if (INTERWORK_SET (src))
2493 {
2494 if (INTERWORK_SET (dest))
2495 {
2496 /* If the src and dest have different interworking flags then turn
2497 off the interworking bit. */
2498 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2499 {
2500 if (INTERWORK_FLAG (dest))
2501 {
2502 /* xgettext:c-format */
2503 _bfd_error_handler (("\
2504Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"),
2505 bfd_get_filename (dest),
2506 bfd_archive_filename (src));
2507 }
2508
2509 SET_INTERWORK_FLAG (dest, 0);
2510 }
2511 }
2512 else
2513 {
2514 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2515 }
2516 }
2517
2518 return TRUE;
2519}
2520
2521/* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2522 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2523#define LOCAL_LABEL_PREFIX ""
2524#ifndef USER_LABEL_PREFIX
2525#define USER_LABEL_PREFIX "_"
2526#endif
2527
2528/* Like _bfd_coff_is_local_label_name, but
2529 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2530 non-local.
2531 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2532 labels of the form Lxxx to be stripped. */
2533static bfd_boolean
2534coff_arm_is_local_label_name (abfd, name)
2535 bfd * abfd ATTRIBUTE_UNUSED;
2536 const char * name;
2537{
2538#ifdef USER_LABEL_PREFIX
2539 if (USER_LABEL_PREFIX[0] != 0)
2540 {
2541 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2542 return FALSE;
2543 }
2544#endif
2545
2546#ifdef LOCAL_LABEL_PREFIX
2547 /* If there is a prefix for local labels then look for this.
2548 If the prefix exists, but it is empty, then ignore the test. */
2549
2550 if (LOCAL_LABEL_PREFIX[0] != 0)
2551 {
2552 size_t len = strlen (LOCAL_LABEL_PREFIX);
2553
2554 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2555 return FALSE;
2556
2557 /* Perform the checks below for the rest of the name. */
2558 name += len;
2559 }
2560#endif
2561
2562 return name[0] == 'L';
2563}
2564
2565/* This piece of machinery exists only to guarantee that the bfd that holds
2566 the glue section is written last.
2567
2568 This does depend on bfd_make_section attaching a new section to the
2569 end of the section list for the bfd.
2570
2571 krk@cygnus.com */
2572
2573static bfd_boolean
2574coff_arm_link_output_has_begun (sub, info)
2575 bfd * sub;
2576 struct coff_final_link_info * info;
2577{
2578 return (sub->output_has_begun
2579 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2580}
2581
2582static bfd_boolean
2583coff_arm_final_link_postscript (abfd, pfinfo)
2584 bfd * abfd ATTRIBUTE_UNUSED;
2585 struct coff_final_link_info * pfinfo;
2586{
2587 struct coff_arm_link_hash_table * globals;
2588
2589 globals = coff_arm_hash_table (pfinfo->info);
2590
2591 BFD_ASSERT (globals != NULL);
2592
2593 if (globals->bfd_of_glue_owner != NULL)
2594 {
2595 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2596 return FALSE;
2597
2598 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2599 }
2600
2601 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2602}
2603
2604#include "coffcode.h"
2605
2606#ifndef TARGET_LITTLE_SYM
2607#define TARGET_LITTLE_SYM armcoff_little_vec
2608#endif
2609#ifndef TARGET_LITTLE_NAME
2610#define TARGET_LITTLE_NAME "coff-arm-little"
2611#endif
2612#ifndef TARGET_BIG_SYM
2613#define TARGET_BIG_SYM armcoff_big_vec
2614#endif
2615#ifndef TARGET_BIG_NAME
2616#define TARGET_BIG_NAME "coff-arm-big"
2617#endif
2618
2619#ifndef TARGET_UNDERSCORE
2620#define TARGET_UNDERSCORE 0
2621#endif
2622
2623#ifndef EXTRA_S_FLAGS
2624#ifdef COFF_WITH_PE
2625#define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2626#else
2627#define EXTRA_S_FLAGS SEC_CODE
2628#endif
2629#endif
2630
2631/* Forward declaration for use initialising alternative_target field. */
2632extern const bfd_target TARGET_BIG_SYM ;
2633
2634/* Target vectors. */
2635CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2636CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)
GDB Binutils - Deliverables
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