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[deliverable/binutils-gdb.git] / bfd / coff-arm.c
1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 1998
3 Free Software Foundation, Inc.
4 Written by Cygnus Support.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22 #include "bfd.h"
23 #include "sysdep.h"
24 #include "libbfd.h"
25
26 #include "coff/arm.h"
27
28 #include "coff/internal.h"
29
30 #ifdef COFF_WITH_PE
31 #include "coff/pe.h"
32 #endif
33
34 #include "libcoff.h"
35
36 /* Macros for manipulation the bits in the flags field of the coff data
37 structure. */
38 #define APCS_26_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_26)
39 #define APCS_FLOAT_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_FLOAT)
40 #define PIC_FLAG( abfd ) (coff_data (abfd)->flags & F_PIC)
41 #define APCS_SET( abfd ) (coff_data (abfd)->flags & F_APCS_SET)
42 #define SET_APCS_FLAGS( abfd, flgs) (coff_data (abfd)->flags = \
43 (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \
44 | (flgs | F_APCS_SET))
45 #define INTERWORK_FLAG( abfd ) (coff_data (abfd)->flags & F_INTERWORK)
46 #define INTERWORK_SET( abfd ) (coff_data (abfd)->flags & F_INTERWORK_SET)
47 #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \
48 (coff_data (abfd)->flags & ~ F_INTERWORK) \
49 | (flg | F_INTERWORK_SET))
50
51 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
52 /* some typedefs for holding instructions */
53 typedef unsigned long int insn32;
54 typedef unsigned short int insn16;
55
56
57 /* Forward declarations for stupid compilers. */
58 static boolean coff_arm_relocate_section
59 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
60 struct internal_reloc *, struct internal_syment *, asection **));
61 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
62 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
63 static bfd_reloc_status_type aoutarm_fix_pcrel_26
64 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
65 static bfd_reloc_status_type coff_thumb_pcrel_23
66 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
67 static bfd_reloc_status_type coff_thumb_pcrel_12
68 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
69 static bfd_reloc_status_type coff_thumb_pcrel_9
70 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
71 static bfd_reloc_status_type coff_arm_reloc
72 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
73 static boolean coff_arm_adjust_symndx
74 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
75 asection *, struct internal_reloc *, boolean *));
76 static reloc_howto_type * coff_arm_rtype_to_howto
77 PARAMS ((bfd *, asection *, struct internal_reloc *,
78 struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
79 static bfd_reloc_status_type coff_thumb_pcrel_common
80 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
81 thumb_pcrel_branchtype));
82 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
83 PARAMS ((bfd *, bfd_reloc_code_real_type));
84 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
85 PARAMS ((bfd *));
86 static insn32 insert_thumb_branch
87 PARAMS ((insn32, int));
88 static struct coff_link_hash_entry * find_thumb_glue
89 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
90 static struct coff_link_hash_entry * find_arm_glue
91 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
92 static void record_arm_to_thumb_glue
93 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
94 static void record_thumb_to_arm_glue
95 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
96 static boolean coff_arm_merge_private_bfd_data
97 PARAMS ((bfd *, bfd *));
98 static boolean coff_arm_print_private_bfd_data
99 PARAMS ((bfd *, PTR));
100 static boolean _bfd_coff_arm_set_private_flags
101 PARAMS ((bfd *, flagword));
102 static boolean coff_arm_copy_private_bfd_data
103 PARAMS ((bfd *, bfd *));
104 static boolean coff_arm_is_local_label_name
105 PARAMS ((bfd *, const char *));
106 static boolean coff_arm_link_output_has_begun
107 PARAMS ((bfd *, struct coff_final_link_info *));
108 static boolean coff_arm_final_link_postscript
109 PARAMS ((bfd *, struct coff_final_link_info *));
110
111 /* The linker script knows the section names for placement.
112 The entry_names are used to do simple name mangling on the stubs.
113 Given a function name, and its type, the stub can be found. The
114 name can be changed. The only requirement is the %s be present.
115 */
116
117 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
118 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
119
120 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
121 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
122
123 /* Used by the assembler. */
124 static bfd_reloc_status_type
125 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
126 error_message)
127 bfd *abfd;
128 arelent *reloc_entry;
129 asymbol *symbol;
130 PTR data;
131 asection *input_section;
132 bfd *output_bfd;
133 char **error_message;
134 {
135 symvalue diff;
136 if (output_bfd == (bfd *) NULL)
137 return bfd_reloc_continue;
138
139 diff = reloc_entry->addend;
140
141 #define DOIT(x) \
142 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
143
144 if (diff != 0)
145 {
146 reloc_howto_type *howto = reloc_entry->howto;
147 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
148
149 switch (howto->size)
150 {
151 case 0:
152 {
153 char x = bfd_get_8 (abfd, addr);
154 DOIT (x);
155 bfd_put_8 (abfd, x, addr);
156 }
157 break;
158
159 case 1:
160 {
161 short x = bfd_get_16 (abfd, addr);
162 DOIT (x);
163 bfd_put_16 (abfd, x, addr);
164 }
165 break;
166
167 case 2:
168 {
169 long x = bfd_get_32 (abfd, addr);
170 DOIT (x);
171 bfd_put_32 (abfd, x, addr);
172 }
173 break;
174
175 default:
176 abort ();
177 }
178 }
179
180 /* Now let bfd_perform_relocation finish everything up. */
181 return bfd_reloc_continue;
182 }
183
184 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
185 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
186 should not. */
187 #ifndef TARGET_UNDERSCORE
188 #define TARGET_UNDERSCORE '_'
189 #endif
190
191 #ifndef PCRELOFFSET
192 #define PCRELOFFSET true
193 #endif
194
195 /* These most certainly belong somewhere else. Just had to get rid of
196 the manifest constants in the code. */
197
198 #define ARM_8 0
199 #define ARM_16 1
200 #define ARM_32 2
201 #define ARM_26 3
202 #define ARM_DISP8 4
203 #define ARM_DISP16 5
204 #define ARM_DISP32 6
205 #define ARM_26D 7
206 /* 8 is unused */
207 #define ARM_NEG16 9
208 #define ARM_NEG32 10
209 #define ARM_RVA32 11
210 #define ARM_THUMB9 12
211 #define ARM_THUMB12 13
212 #define ARM_THUMB23 14
213
214 static reloc_howto_type aoutarm_std_reloc_howto[] =
215 {
216 /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
217 HOWTO(ARM_8, /* type */
218 0, /* rightshift */
219 0, /* size */
220 8, /* bitsize */
221 false, /* pc_relative */
222 0, /* bitpos */
223 complain_overflow_bitfield, /* complain_on_overflow */
224 coff_arm_reloc, /* special_function */
225 "ARM_8", /* name */
226 true, /* partial_inplace */
227 0x000000ff, /* src_mask */
228 0x000000ff, /* dst_mask */
229 PCRELOFFSET /* pcrel_offset */),
230 HOWTO(ARM_16,
231 0,
232 1,
233 16,
234 false,
235 0,
236 complain_overflow_bitfield,
237 coff_arm_reloc,
238 "ARM_16",
239 true,
240 0x0000ffff,
241 0x0000ffff,
242 PCRELOFFSET),
243 HOWTO(ARM_32,
244 0,
245 2,
246 32,
247 false,
248 0,
249 complain_overflow_bitfield,
250 coff_arm_reloc,
251 "ARM_32",
252 true,
253 0xffffffff,
254 0xffffffff,
255 PCRELOFFSET),
256 HOWTO(ARM_26,
257 2,
258 2,
259 24,
260 true,
261 0,
262 complain_overflow_signed,
263 aoutarm_fix_pcrel_26 ,
264 "ARM_26",
265 false,
266 0x00ffffff,
267 0x00ffffff,
268 PCRELOFFSET),
269 HOWTO(ARM_DISP8,
270 0,
271 0,
272 8,
273 true,
274 0,
275 complain_overflow_signed,
276 coff_arm_reloc,
277 "ARM_DISP8",
278 true,
279 0x000000ff,
280 0x000000ff,
281 true),
282 HOWTO( ARM_DISP16,
283 0,
284 1,
285 16,
286 true,
287 0,
288 complain_overflow_signed,
289 coff_arm_reloc,
290 "ARM_DISP16",
291 true,
292 0x0000ffff,
293 0x0000ffff,
294 true),
295 HOWTO( ARM_DISP32,
296 0,
297 2,
298 32,
299 true,
300 0,
301 complain_overflow_signed,
302 coff_arm_reloc,
303 "ARM_DISP32",
304 true,
305 0xffffffff,
306 0xffffffff,
307 true),
308 HOWTO( ARM_26D,
309 2,
310 2,
311 24,
312 false,
313 0,
314 complain_overflow_dont,
315 aoutarm_fix_pcrel_26_done,
316 "ARM_26D",
317 true,
318 0x00ffffff,
319 0x0,
320 false),
321 /* 8 is unused */
322 {-1},
323 HOWTO( ARM_NEG16,
324 0,
325 -1,
326 16,
327 false,
328 0,
329 complain_overflow_bitfield,
330 coff_arm_reloc,
331 "ARM_NEG16",
332 true,
333 0x0000ffff,
334 0x0000ffff,
335 false),
336 HOWTO( ARM_NEG32,
337 0,
338 -2,
339 32,
340 false,
341 0,
342 complain_overflow_bitfield,
343 coff_arm_reloc,
344 "ARM_NEG32",
345 true,
346 0xffffffff,
347 0xffffffff,
348 false),
349 HOWTO( ARM_RVA32,
350 0,
351 2,
352 32,
353 false,
354 0,
355 complain_overflow_bitfield,
356 coff_arm_reloc,
357 "ARM_RVA32",
358 true,
359 0xffffffff,
360 0xffffffff,
361 PCRELOFFSET),
362 HOWTO( ARM_THUMB9,
363 1,
364 1,
365 8,
366 true,
367 0,
368 complain_overflow_signed,
369 coff_thumb_pcrel_9 ,
370 "ARM_THUMB9",
371 false,
372 0x000000ff,
373 0x000000ff,
374 PCRELOFFSET),
375 HOWTO( ARM_THUMB12,
376 1,
377 1,
378 11,
379 true,
380 0,
381 complain_overflow_signed,
382 coff_thumb_pcrel_12 ,
383 "ARM_THUMB12",
384 false,
385 0x000007ff,
386 0x000007ff,
387 PCRELOFFSET),
388 HOWTO( ARM_THUMB23,
389 1,
390 2,
391 22,
392 true,
393 0,
394 complain_overflow_signed,
395 coff_thumb_pcrel_23 ,
396 "ARM_THUMB23",
397 false,
398 0x07ff07ff,
399 0x07ff07ff,
400 PCRELOFFSET),
401 };
402
403 #ifdef COFF_WITH_PE
404 /* Return true if this relocation should
405 appear in the output .reloc section. */
406
407 static boolean
408 in_reloc_p (abfd, howto)
409 bfd * abfd;
410 reloc_howto_type * howto;
411 {
412 return !howto->pc_relative && howto->type != ARM_RVA32;
413 }
414 #endif
415
416
417 #define RTYPE2HOWTO(cache_ptr, dst) \
418 (cache_ptr)->howto = aoutarm_std_reloc_howto + (dst)->r_type;
419
420 #define coff_rtype_to_howto coff_arm_rtype_to_howto
421
422 static reloc_howto_type *
423 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
424 bfd *abfd;
425 asection *sec;
426 struct internal_reloc *rel;
427 struct coff_link_hash_entry *h;
428 struct internal_syment *sym;
429 bfd_vma *addendp;
430 {
431 reloc_howto_type *howto;
432
433 howto = aoutarm_std_reloc_howto + rel->r_type;
434
435 if (rel->r_type == ARM_RVA32)
436 {
437 *addendp -= pe_data(sec->output_section->owner)->pe_opthdr.ImageBase;
438 }
439
440 return howto;
441
442 }
443 /* Used by the assembler. */
444
445 static bfd_reloc_status_type
446 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
447 output_bfd, error_message)
448 bfd *abfd;
449 arelent *reloc_entry;
450 asymbol *symbol;
451 PTR data;
452 asection *input_section;
453 bfd *output_bfd;
454 char **error_message;
455 {
456 /* This is dead simple at present. */
457 return bfd_reloc_ok;
458 }
459
460 /* Used by the assembler. */
461
462 static bfd_reloc_status_type
463 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
464 output_bfd, error_message)
465 bfd *abfd;
466 arelent *reloc_entry;
467 asymbol *symbol;
468 PTR data;
469 asection *input_section;
470 bfd *output_bfd;
471 char **error_message;
472 {
473 bfd_vma relocation;
474 bfd_size_type addr = reloc_entry->address;
475 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
476 bfd_reloc_status_type flag = bfd_reloc_ok;
477
478 /* If this is an undefined symbol, return error */
479 if (symbol->section == &bfd_und_section
480 && (symbol->flags & BSF_WEAK) == 0)
481 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
482
483 /* If the sections are different, and we are doing a partial relocation,
484 just ignore it for now. */
485 if (symbol->section->name != input_section->name
486 && output_bfd != (bfd *)NULL)
487 return bfd_reloc_continue;
488
489 relocation = (target & 0x00ffffff) << 2;
490 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
491 relocation += symbol->value;
492 relocation += symbol->section->output_section->vma;
493 relocation += symbol->section->output_offset;
494 relocation += reloc_entry->addend;
495 relocation -= input_section->output_section->vma;
496 relocation -= input_section->output_offset;
497 relocation -= addr;
498
499 if (relocation & 3)
500 return bfd_reloc_overflow;
501
502 /* Check for overflow */
503 if (relocation & 0x02000000)
504 {
505 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
506 flag = bfd_reloc_overflow;
507 }
508 else if (relocation & ~0x03ffffff)
509 flag = bfd_reloc_overflow;
510
511 target &= ~0x00ffffff;
512 target |= (relocation >> 2) & 0x00ffffff;
513 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
514
515 /* Now the ARM magic... Change the reloc type so that it is marked as done.
516 Strictly this is only necessary if we are doing a partial relocation. */
517 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
518
519 return flag;
520 }
521
522 static bfd_reloc_status_type
523 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
524 output_bfd, error_message, btype)
525 bfd *abfd;
526 arelent *reloc_entry;
527 asymbol *symbol;
528 PTR data;
529 asection *input_section;
530 bfd *output_bfd;
531 char **error_message;
532 thumb_pcrel_branchtype btype;
533 {
534 bfd_vma relocation = 0;
535 bfd_size_type addr = reloc_entry->address;
536 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
537 bfd_reloc_status_type flag = bfd_reloc_ok;
538 bfd_vma dstmsk;
539 bfd_vma offmsk;
540 bfd_vma signbit;
541
542 /* NOTE: This routine is currently used by GAS, but not by the link
543 phase. */
544
545 switch (btype)
546 {
547 case b9:
548 dstmsk = 0x000000ff;
549 offmsk = 0x000001fe;
550 signbit = 0x00000100;
551 break;
552
553 case b12:
554 dstmsk = 0x000007ff;
555 offmsk = 0x00000ffe;
556 signbit = 0x00000800;
557 break;
558
559 case b23:
560 dstmsk = 0x07ff07ff;
561 offmsk = 0x007fffff;
562 signbit = 0x00400000;
563 break;
564
565 default:
566 abort ();
567 }
568
569 /* If this is an undefined symbol, return error */
570 if (symbol->section == &bfd_und_section
571 && (symbol->flags & BSF_WEAK) == 0)
572 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
573
574 /* If the sections are different, and we are doing a partial relocation,
575 just ignore it for now. */
576 if (symbol->section->name != input_section->name
577 && output_bfd != (bfd *)NULL)
578 return bfd_reloc_continue;
579
580 switch (btype)
581 {
582 case b9:
583 case b12:
584 relocation = ((target & dstmsk) << 1);
585 break;
586
587 case b23:
588 if (bfd_big_endian (abfd))
589 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
590 else
591 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
592 break;
593
594 default:
595 abort ();
596 }
597
598 relocation = (relocation ^ signbit) - signbit; /* Sign extend */
599 relocation += symbol->value;
600 relocation += symbol->section->output_section->vma;
601 relocation += symbol->section->output_offset;
602 relocation += reloc_entry->addend;
603 relocation -= input_section->output_section->vma;
604 relocation -= input_section->output_offset;
605 relocation -= addr;
606
607 if (relocation & 1)
608 return bfd_reloc_overflow;
609
610 /* Check for overflow */
611 if (relocation & signbit)
612 {
613 if ((relocation & ~offmsk) != ~offmsk)
614 flag = bfd_reloc_overflow;
615 }
616 else if (relocation & ~offmsk)
617 flag = bfd_reloc_overflow;
618
619 target &= ~dstmsk;
620 switch (btype)
621 {
622 case b9:
623 case b12:
624 target |= (relocation >> 1);
625 break;
626
627 case b23:
628 if (bfd_big_endian (abfd))
629 target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000);
630 else
631 target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
632 break;
633
634 default:
635 abort ();
636 }
637
638 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
639
640 /* Now the ARM magic... Change the reloc type so that it is marked as done.
641 Strictly this is only necessary if we are doing a partial relocation. */
642 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
643
644 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations */
645 return flag;
646 }
647
648 static bfd_reloc_status_type
649 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
650 output_bfd, error_message)
651 bfd *abfd;
652 arelent *reloc_entry;
653 asymbol *symbol;
654 PTR data;
655 asection *input_section;
656 bfd *output_bfd;
657 char **error_message;
658 {
659 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
660 input_section, output_bfd, error_message, b23);
661 }
662
663 static bfd_reloc_status_type
664 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
665 output_bfd, error_message)
666 bfd *abfd;
667 arelent *reloc_entry;
668 asymbol *symbol;
669 PTR data;
670 asection *input_section;
671 bfd *output_bfd;
672 char **error_message;
673 {
674 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
675 input_section, output_bfd, error_message, b12);
676 }
677
678 static bfd_reloc_status_type
679 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
680 output_bfd, error_message)
681 bfd *abfd;
682 arelent *reloc_entry;
683 asymbol *symbol;
684 PTR data;
685 asection *input_section;
686 bfd *output_bfd;
687 char **error_message;
688 {
689 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
690 input_section, output_bfd, error_message, b9);
691 }
692
693
694 static CONST struct reloc_howto_struct *
695 coff_arm_reloc_type_lookup (abfd, code)
696 bfd * abfd;
697 bfd_reloc_code_real_type code;
698 {
699 #define ASTD(i,j) case i: return &aoutarm_std_reloc_howto[j]
700 if (code == BFD_RELOC_CTOR)
701 switch (bfd_get_arch_info (abfd)->bits_per_address)
702 {
703 case 32:
704 code = BFD_RELOC_32;
705 break;
706 default: return (CONST struct reloc_howto_struct *) 0;
707 }
708
709 switch (code)
710 {
711 ASTD (BFD_RELOC_8, ARM_8);
712 ASTD (BFD_RELOC_16, ARM_16);
713 ASTD (BFD_RELOC_32, ARM_32);
714 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
715 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
716 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
717 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
718 ASTD (BFD_RELOC_RVA, ARM_RVA32);
719 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
720 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
721 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
722 default: return (CONST struct reloc_howto_struct *) 0;
723 }
724 }
725
726 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
727 #define COFF_PAGE_SIZE 0x1000
728 /* Turn a howto into a reloc nunmber */
729
730 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
731 #define BADMAG(x) ARMBADMAG(x)
732 #define ARM 1 /* Customize coffcode.h */
733
734 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
735 This allows us to store global data here without actually creating any
736 global variables, which is a no-no in the BFD world. */
737 struct coff_arm_link_hash_table
738 {
739 /* The original coff_link_hash_table structure. MUST be first field. */
740 struct coff_link_hash_table root;
741
742 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
743 long int thumb_glue_size;
744
745 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
746 long int arm_glue_size;
747
748 /* An arbitary input BFD chosen to hold the glue sections. */
749 bfd * bfd_of_glue_owner;
750
751 /* Support interworking with old, non-interworking aware ARM code. */
752 int support_old_code;
753 };
754
755 /* Get the ARM coff linker hash table from a link_info structure. */
756 #define coff_arm_hash_table(info) \
757 ((struct coff_arm_link_hash_table *) ((info)->hash))
758
759 /* Create an ARM coff linker hash table. */
760
761 static struct bfd_link_hash_table *
762 coff_arm_link_hash_table_create (abfd)
763 bfd * abfd;
764 {
765 struct coff_arm_link_hash_table * ret;
766
767 ret = ((struct coff_arm_link_hash_table *)
768 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
769 if (ret == (struct coff_arm_link_hash_table *) NULL)
770 return NULL;
771
772 if (! _bfd_coff_link_hash_table_init
773 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
774 {
775 bfd_release (abfd, ret);
776 return (struct bfd_link_hash_table *) NULL;
777 }
778
779 ret->thumb_glue_size = 0;
780 ret->arm_glue_size = 0;
781 ret->bfd_of_glue_owner = NULL;
782
783 return & ret->root.root;
784 }
785
786 static
787 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
788 struct bfd_link_info *info;
789 bfd *output_bfd;
790 asection *input_section;
791 bfd_vma reloc_offset;
792 {
793 bfd_vma addr = reloc_offset
794 - input_section->vma
795 + input_section->output_offset
796 + input_section->output_section->vma;
797
798 if (coff_data(output_bfd)->pe)
799 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
800 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
801
802 }
803 \f
804 /* The thumb form of a long branch is a bit finicky, because the offset
805 encoding is split over two fields, each in it's own instruction. They
806 can occur in any order. So given a thumb form of long branch, and an
807 offset, insert the offset into the thumb branch and return finished
808 instruction.
809
810 It takes two thumb instructions to encode the target address. Each has
811 11 bits to invest. The upper 11 bits are stored in one (identifed by
812 H-0.. see below), the lower 11 bits are stored in the other (identified
813 by H-1).
814
815 Combine together and shifted left by 1 (it's a half word address) and
816 there you have it.
817
818 Op: 1111 = F,
819 H-0, upper address-0 = 000
820 Op: 1111 = F,
821 H-1, lower address-0 = 800
822
823 They can be ordered either way, but the arm tools I've seen always put
824 the lower one first. It probably doesn't matter. krk@cygnus.com
825
826 XXX: Actually the order does matter. The second instruction (H-1)
827 moves the computed address into the PC, so it must be the second one
828 in the sequence. The problem, however is that whilst little endian code
829 stores the instructions in HI then LOW order, big endian code does the
830 reverse. nickc@cygnus.com */
831
832 #define LOW_HI_ORDER 0xF800F000
833 #define HI_LOW_ORDER 0xF000F800
834
835 static insn32
836 insert_thumb_branch (br_insn, rel_off)
837 insn32 br_insn;
838 int rel_off;
839 {
840 unsigned int low_bits;
841 unsigned int high_bits;
842
843
844 BFD_ASSERT((rel_off & 1) != 1);
845
846 rel_off >>= 1; /* half word aligned address */
847 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
848 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
849
850 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
851 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
852 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
853 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
854 else
855 abort(); /* error - not a valid branch instruction form */
856
857 /* FIXME: abort is probably not the right call. krk@cygnus.com */
858
859 return br_insn;
860 }
861
862 \f
863 static struct coff_link_hash_entry *
864 find_thumb_glue (info, name, input_bfd)
865 struct bfd_link_info * info;
866 CONST char * name;
867 bfd * input_bfd;
868 {
869 char * tmp_name;
870 struct coff_link_hash_entry * myh;
871
872 tmp_name = ((char *)
873 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
874
875 BFD_ASSERT (tmp_name);
876
877 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
878
879 myh = coff_link_hash_lookup
880 (coff_hash_table (info), tmp_name, false, false, true);
881
882 if (myh == NULL)
883 /* xgettext:c-format */
884 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
885 bfd_get_filename (input_bfd), tmp_name, name);
886
887 free (tmp_name);
888
889 return myh;
890 }
891
892 static struct coff_link_hash_entry *
893 find_arm_glue (info, name, input_bfd)
894 struct bfd_link_info * info;
895 CONST char * name;
896 bfd * input_bfd;
897 {
898 char * tmp_name;
899 struct coff_link_hash_entry * myh;
900
901 tmp_name = ((char *)
902 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
903
904 BFD_ASSERT (tmp_name);
905
906 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
907
908 myh = coff_link_hash_lookup
909 (coff_hash_table (info), tmp_name, false, false, true);
910
911 if (myh == NULL)
912 /* xgettext:c-format */
913 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
914 bfd_get_filename (input_bfd), tmp_name, name);
915
916 free (tmp_name);
917
918 return myh;
919 }
920
921 /*
922 ARM->Thumb glue:
923
924 .arm
925 __func_from_arm:
926 ldr r12, __func_addr
927 bx r12
928 __func_addr:
929 .word func @ behave as if you saw a ARM_32 reloc
930 */
931
932 #define ARM2THUMB_GLUE_SIZE 12
933 static const insn32 a2t1_ldr_insn = 0xe59fc000;
934 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
935 static const insn32 a2t3_func_addr_insn = 0x00000001;
936
937 #define A2T3_OFFSET 8
938
939 /*
940 Thumb->ARM: Thumb->(non-interworking aware) ARM
941
942 .thumb .thumb
943 .align 2 .align 2
944 __func_from_thumb: __func_from_thumb:
945 bx pc push {r6, lr}
946 nop ldr r6, __func_addr
947 .arm mov lr, pc
948 __func_change_to_arm: bx r6
949 b func .arm
950 __func_back_to_thumb:
951 ldmia r13! {r6, lr}
952 bx lr
953 __func_addr:
954 .word func
955 */
956
957 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
958 static const insn16 t2a1_bx_pc_insn = 0x4778;
959 static const insn16 t2a2_noop_insn = 0x46c0;
960 static const insn32 t2a3_b_insn = 0xea000000;
961
962 #define T2A3_OFFSET 8
963
964 static const insn16 t2a1_push_insn = 0xb540;
965 static const insn16 t2a2_ldr_insn = 0x4e03;
966 static const insn16 t2a3_mov_insn = 0x46fe;
967 static const insn16 t2a4_bx_insn = 0x4730;
968 static const insn32 t2a5_pop_insn = 0xe8bd4040;
969 static const insn32 t2a6_bx_insn = 0xe12fff1e;
970
971 /* TODO:
972 We should really create new local (static) symbols in destination
973 object for each stub we create. We should also create local
974 (static) symbols within the stubs when switching between ARM and
975 Thumb code. This will ensure that the debugger and disassembler
976 can present a better view of stubs.
977
978 We can treat stubs like literal sections, and for the THUMB9 ones
979 (short addressing range) we should be able to insert the stubs
980 between sections. i.e. the simplest approach (since relocations
981 are done on a section basis) is to dump the stubs at the end of
982 processing a section. That way we can always try and minimise the
983 offset to and from a stub. However, this does not map well onto
984 the way that the linker/BFD does its work: mapping all input
985 sections to output sections via the linker script before doing
986 all the processing.
987
988 Unfortunately it may be easier to just to disallow short range
989 Thumb->ARM stubs (i.e. no conditional inter-working branches,
990 only branch-and-link (BL) calls. This will simplify the processing
991 since we can then put all of the stubs into their own section.
992
993 TODO:
994 On a different subject, rather than complaining when a
995 branch cannot fit in the number of bits available for the
996 instruction we should generate a trampoline stub (needed to
997 address the complete 32bit address space). */
998
999 /* The standard COFF backend linker does not cope with the special
1000 Thumb BRANCH23 relocation. The alternative would be to split the
1001 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1002 bit simpler simply providing our own relocation driver. */
1003
1004 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1005 This code is a very slightly modified copy of
1006 _bfd_coff_generic_relocate_section. It would be a much more
1007 maintainable solution to have a MACRO that could be expanded within
1008 _bfd_coff_generic_relocate_section that would only be provided for
1009 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1010 is different from the original. */
1011
1012 static boolean
1013 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1014 contents, relocs, syms, sections)
1015 bfd *output_bfd;
1016 struct bfd_link_info *info;
1017 bfd *input_bfd;
1018 asection *input_section;
1019 bfd_byte *contents;
1020 struct internal_reloc *relocs;
1021 struct internal_syment *syms;
1022 asection **sections;
1023 {
1024 struct internal_reloc * rel;
1025 struct internal_reloc * relend;
1026
1027 rel = relocs;
1028 relend = rel + input_section->reloc_count;
1029
1030 for (; rel < relend; rel++)
1031 {
1032 int done = 0;
1033 long symndx;
1034 struct coff_link_hash_entry * h;
1035 struct internal_syment * sym;
1036 bfd_vma addend;
1037 bfd_vma val;
1038 reloc_howto_type * howto;
1039 bfd_reloc_status_type rstat;
1040 bfd_vma h_val;
1041
1042 symndx = rel->r_symndx;
1043
1044 if (symndx == -1)
1045 {
1046 h = NULL;
1047 sym = NULL;
1048 }
1049 else
1050 {
1051 h = obj_coff_sym_hashes (input_bfd)[symndx];
1052 sym = syms + symndx;
1053 }
1054
1055 /* COFF treats common symbols in one of two ways. Either the
1056 size of the symbol is included in the section contents, or it
1057 is not. We assume that the size is not included, and force
1058 the rtype_to_howto function to adjust the addend as needed. */
1059
1060 if (sym != NULL && sym->n_scnum != 0)
1061 addend = - sym->n_value;
1062 else
1063 addend = 0;
1064
1065
1066 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1067 sym, &addend);
1068 if (howto == NULL)
1069 return false;
1070
1071 /* The relocation_section function will skip pcrel_offset relocs
1072 when doing a relocateable link. However, we want to convert
1073 ARM26 to ARM26D relocs if possible. We return a fake howto in
1074 this case without pcrel_offset set, and adjust the addend to
1075 compensate. */
1076 if (rel->r_type == ARM_26
1077 && h != NULL
1078 && info->relocateable
1079 && (h->root.type == bfd_link_hash_defined
1080 || h->root.type == bfd_link_hash_defweak)
1081 && h->root.u.def.section->output_section == input_section->output_section)
1082 {
1083 static reloc_howto_type fake_arm26_reloc =
1084 HOWTO (ARM_26,
1085 2,
1086 2,
1087 24,
1088 true,
1089 0,
1090 complain_overflow_signed,
1091 aoutarm_fix_pcrel_26 ,
1092 "ARM_26",
1093 false,
1094 0x00ffffff,
1095 0x00ffffff,
1096 false);
1097
1098 addend -= rel->r_vaddr - input_section->vma;
1099 howto = &fake_arm26_reloc;
1100 }
1101
1102 /* If we are doing a relocateable link, then we can just ignore
1103 a PC relative reloc that is pcrel_offset. It will already
1104 have the correct value. If this is not a relocateable link,
1105 then we should ignore the symbol value. */
1106 if (howto->pc_relative && howto->pcrel_offset)
1107 {
1108 if (info->relocateable)
1109 continue;
1110 if (sym != NULL && sym->n_scnum != 0)
1111 addend += sym->n_value;
1112 }
1113
1114 val = 0;
1115
1116 if (h == NULL)
1117 {
1118 asection *sec;
1119
1120 if (symndx == -1)
1121 {
1122 sec = bfd_abs_section_ptr;
1123 val = 0;
1124 }
1125 else
1126 {
1127 sec = sections[symndx];
1128 val = (sec->output_section->vma
1129 + sec->output_offset
1130 + sym->n_value
1131 - sec->vma);
1132 }
1133 }
1134 else
1135 {
1136 #if 1 /* THUMBEXTENSION */
1137 /* We don't output the stubs if we are generating a
1138 relocatable output file, since we may as well leave the
1139 stub generation to the final linker pass. If we fail to
1140 verify that the name is defined, we'll try to build stubs
1141 for an undefined name... */
1142 if (! info->relocateable
1143 && ( h->root.type == bfd_link_hash_defined
1144 || h->root.type == bfd_link_hash_defweak))
1145 {
1146 asection * h_sec = h->root.u.def.section;
1147 const char * name = h->root.root.string;
1148
1149 /* h locates the symbol referenced in the reloc. */
1150 h_val = (h->root.u.def.value
1151 + h_sec->output_section->vma
1152 + h_sec->output_offset);
1153
1154 if (howto->type == ARM_26)
1155 {
1156 if ( h->class == C_THUMBSTATFUNC
1157 || h->class == C_THUMBEXTFUNC)
1158 {
1159 /* Arm code calling a Thumb function */
1160 unsigned long int tmp;
1161 long int my_offset;
1162 asection * s;
1163 long int ret_offset;
1164 struct coff_link_hash_entry * myh;
1165 struct coff_arm_link_hash_table * globals;
1166
1167 myh = find_arm_glue (info, name, input_bfd);
1168 if (myh == NULL)
1169 return false;
1170
1171 globals = coff_arm_hash_table (info);
1172
1173 BFD_ASSERT (globals != NULL);
1174 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1175
1176 my_offset = myh->root.u.def.value;
1177
1178 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1179 ARM2THUMB_GLUE_SECTION_NAME);
1180 BFD_ASSERT (s != NULL);
1181 BFD_ASSERT (s->contents != NULL);
1182 BFD_ASSERT (s->output_section != NULL);
1183
1184 if ((my_offset & 0x01) == 0x01)
1185 {
1186 if (h_sec->owner != NULL
1187 && INTERWORK_SET (h_sec->owner)
1188 && ! INTERWORK_FLAG (h_sec->owner))
1189 {
1190 _bfd_error_handler
1191 /* xgettext:c-format */
1192 (_("%s(%s): warning: interworking not enabled."),
1193 bfd_get_filename (h_sec->owner), name);
1194 _bfd_error_handler
1195 /* xgettext:c-format */
1196 (_(" first occurrence: %s: arm call to thumb"),
1197 bfd_get_filename (input_bfd));
1198 }
1199
1200 --my_offset;
1201 myh->root.u.def.value = my_offset;
1202
1203 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1204 s->contents + my_offset);
1205
1206 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1207 s->contents + my_offset + 4);
1208
1209 /* It's a thumb address. Add the low order bit. */
1210 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1211 s->contents + my_offset + 8);
1212
1213 if (info->base_file)
1214 arm_emit_base_file_entry (info, output_bfd, s, A2T3_OFFSET);
1215
1216 }
1217
1218 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1219
1220 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1221 - input_section->vma);
1222
1223 tmp = tmp & 0xFF000000;
1224
1225 /* Somehow these are both 4 too far, so subtract 8. */
1226 ret_offset =
1227 s->output_offset
1228 + my_offset
1229 + s->output_section->vma
1230 - (input_section->output_offset
1231 + input_section->output_section->vma
1232 + rel->r_vaddr)
1233 - 8;
1234
1235 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1236
1237 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1238 - input_section->vma);
1239
1240 done = 1;
1241 }
1242 }
1243
1244 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1245 else if (howto->type == ARM_THUMB23)
1246 {
1247 if ( h->class == C_EXT
1248 || h->class == C_STAT
1249 || h->class == C_LABEL)
1250 {
1251 /* Thumb code calling an ARM function */
1252 asection * s = 0;
1253 long int my_offset;
1254 unsigned long int tmp;
1255 long int ret_offset;
1256 struct coff_link_hash_entry * myh;
1257 struct coff_arm_link_hash_table * globals;
1258
1259 myh = find_thumb_glue (info, name, input_bfd);
1260 if (myh == NULL)
1261 return false;
1262
1263 globals = coff_arm_hash_table (info);
1264
1265 BFD_ASSERT (globals != NULL);
1266 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1267
1268 my_offset = myh->root.u.def.value;
1269
1270 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1271 THUMB2ARM_GLUE_SECTION_NAME);
1272
1273 BFD_ASSERT (s != NULL);
1274 BFD_ASSERT (s->contents != NULL);
1275 BFD_ASSERT (s->output_section != NULL);
1276
1277 if ((my_offset & 0x01) == 0x01)
1278 {
1279 if (h_sec->owner != NULL
1280 && INTERWORK_SET (h_sec->owner)
1281 && ! INTERWORK_FLAG (h_sec->owner)
1282 && ! globals->support_old_code)
1283 {
1284 _bfd_error_handler
1285 /* xgettext:c-format */
1286 (_("%s(%s): warning: interworking not enabled."),
1287 bfd_get_filename (h_sec->owner), name);
1288 _bfd_error_handler
1289 /* xgettext:c-format */
1290 (_(" first occurrence: %s: thumb call to arm"),
1291 bfd_get_filename (input_bfd));
1292 _bfd_error_handler
1293 (_(" consider relinking with --support-old-code enabled"));
1294 }
1295
1296 -- my_offset;
1297 myh->root.u.def.value = my_offset;
1298
1299 if (globals->support_old_code)
1300 {
1301 bfd_put_16 (output_bfd, t2a1_push_insn,
1302 s->contents + my_offset);
1303
1304 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1305 s->contents + my_offset + 2);
1306
1307 bfd_put_16 (output_bfd, t2a3_mov_insn,
1308 s->contents + my_offset + 4);
1309
1310 bfd_put_16 (output_bfd, t2a4_bx_insn,
1311 s->contents + my_offset + 6);
1312
1313 bfd_put_32 (output_bfd, t2a5_pop_insn,
1314 s->contents + my_offset + 8);
1315
1316 bfd_put_32 (output_bfd, t2a6_bx_insn,
1317 s->contents + my_offset + 12);
1318
1319 /* Store the address of the function in the last word of the stub. */
1320 bfd_put_32 (output_bfd, h_val,
1321 s->contents + my_offset + 16);
1322 }
1323 else
1324 {
1325 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1326 s->contents + my_offset);
1327
1328 bfd_put_16 (output_bfd, t2a2_noop_insn,
1329 s->contents + my_offset + 2);
1330
1331 ret_offset =
1332 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1333 - ((bfd_signed_vma)
1334 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1335 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1336 + s->output_section->vma) /* Address of the start of the current section. */
1337 + 4 /* The branch instruction is 4 bytes into the stub. */
1338 + 8); /* ARM branches work from the pc of the instruction + 8. */
1339
1340 bfd_put_32 (output_bfd,
1341 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1342 s->contents + my_offset + 4);
1343
1344 if (info->base_file)
1345 arm_emit_base_file_entry (info, output_bfd, s, T2A3_OFFSET);
1346 }
1347 }
1348
1349 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1350
1351 /* Now go back and fix up the original BL insn to point
1352 to here. */
1353 ret_offset =
1354 s->output_offset
1355 + my_offset
1356 - (input_section->output_offset
1357 + rel->r_vaddr)
1358 -4;
1359
1360 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1361 - input_section->vma);
1362
1363 bfd_put_32 (output_bfd,
1364 insert_thumb_branch (tmp, ret_offset),
1365 contents + rel->r_vaddr
1366 - input_section->vma);
1367
1368 if (info->base_file)
1369 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1370
1371 done = 1;
1372 }
1373 }
1374 }
1375
1376 /* If the relocation type and destination symbol does not
1377 fall into one of the above categories, then we can just
1378 perform a direct link. */
1379
1380 if (done)
1381 rstat = bfd_reloc_ok;
1382 else
1383 #endif /* THUMBEXTENSION */
1384 if ( h->root.type == bfd_link_hash_defined
1385 || h->root.type == bfd_link_hash_defweak)
1386 {
1387 asection *sec;
1388
1389 sec = h->root.u.def.section;
1390 val = (h->root.u.def.value
1391 + sec->output_section->vma
1392 + sec->output_offset);
1393 }
1394
1395 else if (! info->relocateable)
1396 {
1397 if (! ((*info->callbacks->undefined_symbol)
1398 (info, h->root.root.string, input_bfd, input_section,
1399 rel->r_vaddr - input_section->vma)))
1400 return false;
1401 }
1402 }
1403
1404 if (info->base_file)
1405 {
1406 /* Emit a reloc if the backend thinks it needs it. */
1407 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1408 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1409 }
1410
1411 #if 1 /* THUMBEXTENSION */
1412 if (done)
1413 rstat = bfd_reloc_ok;
1414 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1415 else if (! info->relocateable
1416 && howto->type == ARM_THUMB23)
1417 {
1418 /* This is pretty much a copy of what the default
1419 _bfd_final_link_relocate and _bfd_relocate_contents
1420 routines do to perform a relocation, with special
1421 processing for the split addressing of the Thumb BL
1422 instruction. Again, it would probably be simpler adding a
1423 ThumbBRANCH23 specific macro expansion into the default
1424 code. */
1425
1426 bfd_vma address = rel->r_vaddr - input_section->vma;
1427
1428 if (address > input_section->_raw_size)
1429 rstat = bfd_reloc_outofrange;
1430 else
1431 {
1432 bfd_vma relocation = val + addend;
1433 int size = bfd_get_reloc_size (howto);
1434 boolean overflow = false;
1435 bfd_byte * location = contents + address;
1436 bfd_vma x = bfd_get_32 (input_bfd, location);
1437 bfd_vma src_mask = 0x007FFFFE;
1438 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1439 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1440 bfd_vma check;
1441 bfd_signed_vma signed_check;
1442 bfd_vma add;
1443 bfd_signed_vma signed_add;
1444
1445 BFD_ASSERT (size == 4);
1446
1447 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1448 relocation -= (input_section->output_section->vma
1449 + input_section->output_offset);
1450
1451 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1452 relocation -= address;
1453
1454 /* No need to negate the relocation with BRANCH23. */
1455 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1456 /* howto->rightshift == 1 */
1457 /* Drop unwanted bits from the value we are relocating to. */
1458
1459 check = relocation >> howto->rightshift;
1460
1461 /* If this is a signed value, the rightshift just dropped
1462 leading 1 bits (assuming twos complement). */
1463 if ((bfd_signed_vma) relocation >= 0)
1464 signed_check = check;
1465 else
1466 signed_check = (check
1467 | ((bfd_vma) - 1
1468 & ~((bfd_vma) - 1 >> howto->rightshift)));
1469
1470 /* Get the value from the object file. */
1471 if (bfd_big_endian (input_bfd))
1472 {
1473 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1474 }
1475 else
1476 {
1477 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1478 }
1479
1480 /* Get the value from the object file with an appropriate sign.
1481 The expression involving howto->src_mask isolates the upper
1482 bit of src_mask. If that bit is set in the value we are
1483 adding, it is negative, and we subtract out that number times
1484 two. If src_mask includes the highest possible bit, then we
1485 can not get the upper bit, but that does not matter since
1486 signed_add needs no adjustment to become negative in that
1487 case. */
1488
1489 signed_add = add;
1490
1491 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1492 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1493
1494 /* Add the value from the object file, shifted so that it is a
1495 straight number. */
1496 /* howto->bitpos == 0 */
1497
1498 signed_check += signed_add;
1499 relocation += signed_add;
1500
1501 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1502
1503 /* Assumes two's complement. */
1504 if ( signed_check > reloc_signed_max
1505 || signed_check < reloc_signed_min)
1506 overflow = true;
1507
1508 /* Put RELOCATION into the correct bits: */
1509
1510 if (bfd_big_endian (input_bfd))
1511 {
1512 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1513 }
1514 else
1515 {
1516 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1517 }
1518
1519 /* Add RELOCATION to the correct bits of X: */
1520 x = ((x & ~howto->dst_mask) | relocation);
1521
1522 /* Put the relocated value back in the object file: */
1523 bfd_put_32 (input_bfd, x, location);
1524
1525 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1526 }
1527 }
1528 else
1529 #endif /* THUMBEXTENSION */
1530 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1531 contents,
1532 rel->r_vaddr - input_section->vma,
1533 val, addend);
1534 #if 1 /* THUMBEXTENSION */
1535 /* FIXME:
1536 Is this the best way to fix up thumb addresses? krk@cygnus.com
1537 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1538 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1539 if (! info->relocateable
1540 && rel->r_type == ARM_32)
1541 {
1542 /* Determine if we need to set the bottom bit of a relocated address
1543 because the address is the address of a Thumb code symbol. */
1544
1545 int patchit = false;
1546
1547 if (h != NULL
1548 && ( h->class == C_THUMBSTATFUNC
1549 || h->class == C_THUMBEXTFUNC))
1550 {
1551 patchit = true;
1552 }
1553 else if (sym != NULL
1554 && sym->n_scnum > N_UNDEF)
1555 {
1556 /* No hash entry - use the symbol instead. */
1557
1558 if ( sym->n_sclass == C_THUMBSTATFUNC
1559 || sym->n_sclass == C_THUMBEXTFUNC)
1560 patchit = true;
1561 }
1562
1563 if (patchit)
1564 {
1565 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1566 bfd_vma x = bfd_get_32 (input_bfd, location);
1567
1568 bfd_put_32 (input_bfd, x | 1, location);
1569 }
1570 }
1571 #endif /* THUMBEXTENSION */
1572
1573 switch (rstat)
1574 {
1575 default:
1576 abort ();
1577 case bfd_reloc_ok:
1578 break;
1579 case bfd_reloc_outofrange:
1580 (*_bfd_error_handler)
1581 (_("%s: bad reloc address 0x%lx in section `%s'"),
1582 bfd_get_filename (input_bfd),
1583 (unsigned long) rel->r_vaddr,
1584 bfd_get_section_name (input_bfd, input_section));
1585 return false;
1586 case bfd_reloc_overflow:
1587 {
1588 const char *name;
1589 char buf[SYMNMLEN + 1];
1590
1591 if (symndx == -1)
1592 name = "*ABS*";
1593 else if (h != NULL)
1594 name = h->root.root.string;
1595 else
1596 {
1597 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1598 if (name == NULL)
1599 return false;
1600 }
1601
1602 if (! ((*info->callbacks->reloc_overflow)
1603 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1604 input_section, rel->r_vaddr - input_section->vma)))
1605 return false;
1606 }
1607 }
1608 }
1609
1610 return true;
1611 }
1612
1613 #ifndef COFF_WITH_PE
1614 boolean
1615 bfd_arm_allocate_interworking_sections (info)
1616 struct bfd_link_info * info;
1617 {
1618 asection * s;
1619 bfd_byte * foo;
1620 struct coff_arm_link_hash_table * globals;
1621 #if 0
1622 static char test_char = '1';
1623 #endif
1624
1625 globals = coff_arm_hash_table (info);
1626
1627 BFD_ASSERT (globals != NULL);
1628
1629 if (globals->arm_glue_size != 0)
1630 {
1631 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1632
1633 s = bfd_get_section_by_name
1634 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1635
1636 BFD_ASSERT (s != NULL);
1637
1638 foo = (bfd_byte *) bfd_alloc
1639 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1640 #if 0
1641 memset (foo, test_char, globals->arm_glue_size);
1642 #endif
1643
1644 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1645 s->contents = foo;
1646 }
1647
1648 if (globals->thumb_glue_size != 0)
1649 {
1650 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1651
1652 s = bfd_get_section_by_name
1653 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1654
1655 BFD_ASSERT (s != NULL);
1656
1657 foo = (bfd_byte *) bfd_alloc
1658 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1659 #if 0
1660 memset (foo, test_char, globals->thumb_glue_size);
1661 #endif
1662
1663 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1664 s->contents = foo;
1665 }
1666
1667 return true;
1668 }
1669
1670 static void
1671 record_arm_to_thumb_glue (info, h)
1672 struct bfd_link_info * info;
1673 struct coff_link_hash_entry * h;
1674 {
1675 const char * name = h->root.root.string;
1676 register asection * s;
1677 char * tmp_name;
1678 struct coff_link_hash_entry * myh;
1679 struct coff_arm_link_hash_table * globals;
1680
1681 globals = coff_arm_hash_table (info);
1682
1683 BFD_ASSERT (globals != NULL);
1684 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1685
1686 s = bfd_get_section_by_name
1687 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1688
1689 BFD_ASSERT (s != NULL);
1690
1691 tmp_name = ((char *)
1692 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1693
1694 BFD_ASSERT (tmp_name);
1695
1696 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1697
1698 myh = coff_link_hash_lookup
1699 (coff_hash_table (info), tmp_name, false, false, true);
1700
1701 if (myh != NULL)
1702 {
1703 free (tmp_name);
1704 return; /* we've already seen this guy */
1705 }
1706
1707 /* The only trick here is using globals->arm_glue_size as the value. Even
1708 though the section isn't allocated yet, this is where we will be putting
1709 it. */
1710
1711 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1712 BSF_GLOBAL,
1713 s, globals->arm_glue_size + 1,
1714 NULL, true, false,
1715 (struct bfd_link_hash_entry **) & myh);
1716
1717 free (tmp_name);
1718
1719 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1720
1721 return;
1722 }
1723
1724 static void
1725 record_thumb_to_arm_glue (info, h)
1726 struct bfd_link_info * info;
1727 struct coff_link_hash_entry * h;
1728 {
1729 const char * name = h->root.root.string;
1730 register asection * s;
1731 char * tmp_name;
1732 struct coff_link_hash_entry * myh;
1733 struct coff_arm_link_hash_table * globals;
1734
1735
1736 globals = coff_arm_hash_table (info);
1737
1738 BFD_ASSERT (globals != NULL);
1739 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1740
1741 s = bfd_get_section_by_name
1742 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1743
1744 BFD_ASSERT (s != NULL);
1745
1746 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1747
1748 BFD_ASSERT (tmp_name);
1749
1750 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1751
1752 myh = coff_link_hash_lookup
1753 (coff_hash_table (info), tmp_name, false, false, true);
1754
1755 if (myh != NULL)
1756 {
1757 free (tmp_name);
1758 return; /* we've already seen this guy */
1759 }
1760
1761 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1762 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1763 NULL, true, false,
1764 (struct bfd_link_hash_entry **) & myh);
1765
1766 /* If we mark it 'thumb', the disassembler will do a better job. */
1767 myh->class = C_THUMBEXTFUNC;
1768
1769 free (tmp_name);
1770
1771 /* Allocate another symbol to mark where we switch to arm mode. */
1772
1773 #define CHANGE_TO_ARM "__%s_change_to_arm"
1774 #define BACK_FROM_ARM "__%s_back_from_arm"
1775
1776 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1777
1778 BFD_ASSERT (tmp_name);
1779
1780 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1781
1782 myh = NULL;
1783
1784 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1785 BSF_LOCAL, s, globals->thumb_glue_size
1786 + (globals->support_old_code ? 8 : 4),
1787 NULL, true, false,
1788 (struct bfd_link_hash_entry **) & myh);
1789
1790 free (tmp_name);
1791
1792 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1793
1794 return;
1795 }
1796
1797 /* Select a BFD to be used to hold the sections used by the glue code.
1798 This function is called from the linker scripts in ld/emultempl/
1799 {armcoff/pe}.em */
1800 boolean
1801 bfd_arm_get_bfd_for_interworking (abfd, info)
1802 bfd * abfd;
1803 struct bfd_link_info * info;
1804 {
1805 struct coff_arm_link_hash_table * globals;
1806 flagword flags;
1807 asection * sec;
1808
1809 /* If we are only performing a partial link do not bother
1810 getting a bfd to hold the glue. */
1811 if (info->relocateable)
1812 return true;
1813
1814 globals = coff_arm_hash_table (info);
1815
1816 BFD_ASSERT (globals != NULL);
1817
1818 if (globals->bfd_of_glue_owner != NULL)
1819 return true;
1820
1821 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1822
1823 if (sec == NULL)
1824 {
1825 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
1826
1827 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1828
1829 if (sec == NULL
1830 || ! bfd_set_section_flags (abfd, sec, flags)
1831 || ! bfd_set_section_alignment (abfd, sec, 2))
1832 return false;
1833 }
1834
1835 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1836
1837 if (sec == NULL)
1838 {
1839 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
1840
1841 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1842
1843 if (sec == NULL
1844 || ! bfd_set_section_flags (abfd, sec, flags)
1845 || ! bfd_set_section_alignment (abfd, sec, 2))
1846 return false;
1847 }
1848
1849 /* Save the bfd for later use. */
1850 globals->bfd_of_glue_owner = abfd;
1851
1852 return true;
1853 }
1854
1855 boolean
1856 bfd_arm_process_before_allocation (abfd, info, support_old_code)
1857 bfd * abfd;
1858 struct bfd_link_info * info;
1859 int support_old_code;
1860 {
1861 asection * sec;
1862 struct coff_arm_link_hash_table * globals;
1863
1864 /* If we are only performing a partial link do not bother
1865 to construct any glue. */
1866 if (info->relocateable)
1867 return true;
1868
1869 /* Here we have a bfd that is to be included on the link. We have a hook
1870 to do reloc rummaging, before section sizes are nailed down. */
1871
1872 _bfd_coff_get_external_symbols (abfd);
1873
1874 globals = coff_arm_hash_table (info);
1875
1876 BFD_ASSERT (globals != NULL);
1877 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1878
1879 globals->support_old_code = support_old_code;
1880
1881 /* Rummage around all the relocs and map the glue vectors. */
1882 sec = abfd->sections;
1883
1884 if (sec == NULL)
1885 return true;
1886
1887 for (; sec != NULL; sec = sec->next)
1888 {
1889 struct internal_reloc * i;
1890 struct internal_reloc * rel;
1891
1892 if (sec->reloc_count == 0)
1893 continue;
1894
1895 /* Load the relocs. */
1896 /* FIXME: there may be a storage leak here. */
1897
1898 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
1899
1900 BFD_ASSERT (i != 0);
1901
1902 for (rel = i; rel < i + sec->reloc_count; ++rel)
1903 {
1904 unsigned short r_type = rel->r_type;
1905 long symndx;
1906 struct coff_link_hash_entry * h;
1907
1908 symndx = rel->r_symndx;
1909
1910 /* If the relocation is not against a symbol it cannot concern us. */
1911 if (symndx == -1)
1912 continue;
1913
1914 h = obj_coff_sym_hashes (abfd)[symndx];
1915
1916 /* If the relocation is against a static symbol it must be within
1917 the current section and so cannot be a cross ARM/Thumb relocation. */
1918 if (h == NULL)
1919 continue;
1920
1921 switch (r_type)
1922 {
1923 case ARM_26:
1924 /* This one is a call from arm code. We need to look up
1925 the target of the call. If it is a thumb target, we
1926 insert glue. */
1927
1928 if (h->class == C_THUMBEXTFUNC)
1929 record_arm_to_thumb_glue (info, h);
1930 break;
1931
1932 case ARM_THUMB23:
1933 /* This one is a call from thumb code. We used to look
1934 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
1935 up the target of the call. If it is an arm target, we
1936 insert glue. If the symbol does not exist it will be
1937 given a class of C_EXT and so we will generate a stub
1938 for it. This is not really a problem, since the link
1939 is doomed anyway. */
1940
1941 switch (h->class)
1942 {
1943 case C_EXT:
1944 case C_STAT:
1945 case C_LABEL:
1946 record_thumb_to_arm_glue (info, h);
1947 break;
1948 default:
1949 ;
1950 }
1951 break;
1952
1953 default:
1954 break;
1955 }
1956 }
1957 }
1958
1959 return true;
1960 }
1961
1962 #endif /* ! COFF_WITH_PE */
1963
1964 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
1965 #define coff_relocate_section coff_arm_relocate_section
1966 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
1967 #define coff_adjust_symndx coff_arm_adjust_symndx
1968 #define coff_link_output_has_begun coff_arm_link_output_has_begun
1969 #define coff_final_link_postscript coff_arm_final_link_postscript
1970 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
1971 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
1972 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
1973 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
1974 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
1975
1976
1977 /* When doing a relocateable link, we want to convert ARM26 relocs
1978 into ARM26D relocs. */
1979
1980 static boolean
1981 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
1982 bfd *obfd;
1983 struct bfd_link_info *info;
1984 bfd *ibfd;
1985 asection *sec;
1986 struct internal_reloc *irel;
1987 boolean *adjustedp;
1988 {
1989 if (irel->r_type == 3)
1990 {
1991 struct coff_link_hash_entry *h;
1992
1993 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
1994 if (h != NULL
1995 && (h->root.type == bfd_link_hash_defined
1996 || h->root.type == bfd_link_hash_defweak)
1997 && h->root.u.def.section->output_section == sec->output_section)
1998 irel->r_type = 7;
1999 }
2000 *adjustedp = false;
2001 return true;
2002 }
2003
2004 /* Called when merging the private data areas of two BFDs.
2005 This is important as it allows us to detect if we are
2006 attempting to merge binaries compiled for different ARM
2007 targets, eg different CPUs or differents APCS's. */
2008
2009 static boolean
2010 coff_arm_merge_private_bfd_data (ibfd, obfd)
2011 bfd * ibfd;
2012 bfd * obfd;
2013 {
2014 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2015
2016 if (ibfd == obfd)
2017 return true;
2018
2019 /* If the two formats are different we cannot merge anything.
2020 This is not an error, since it is permissable to change the
2021 input and output formats. */
2022 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2023 || obfd->xvec->flavour != bfd_target_coff_flavour)
2024 return true;
2025
2026 /* Verify that the APCS is the same for the two BFDs */
2027 if (APCS_SET (ibfd))
2028 {
2029 if (APCS_SET (obfd))
2030 {
2031 /* If the src and dest have different APCS flag bits set, fail. */
2032 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2033 {
2034 _bfd_error_handler
2035 /* xgettext: c-format */
2036 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2037 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2038 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2039 );
2040
2041 bfd_set_error (bfd_error_wrong_format);
2042 return false;
2043 }
2044
2045 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2046 {
2047 const char *msg;
2048
2049 if (APCS_FLOAT_FLAG (ibfd))
2050 /* xgettext: c-format */
2051 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2052 else
2053 /* xgettext: c-format */
2054 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2055
2056 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2057 bfd_get_filename (obfd));
2058
2059 bfd_set_error (bfd_error_wrong_format);
2060 return false;
2061 }
2062
2063 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2064 {
2065 const char * msg;
2066
2067 if (PIC_FLAG (ibfd))
2068 /* xgettext: c-format */
2069 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2070 else
2071 /* xgettext: c-format */
2072 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2073 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2074 bfd_get_filename (obfd));
2075
2076 bfd_set_error (bfd_error_wrong_format);
2077 return false;
2078 }
2079 }
2080 else
2081 {
2082 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2083
2084 /* Set up the arch and fields as well as these are probably wrong. */
2085 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2086 }
2087 }
2088
2089 /* Check the interworking support. */
2090 if (INTERWORK_SET (ibfd))
2091 {
2092 if (INTERWORK_SET (obfd))
2093 {
2094 /* If the src and dest differ in their interworking issue a warning. */
2095 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2096 {
2097 const char * msg;
2098
2099 if (INTERWORK_FLAG (ibfd))
2100 /* xgettext: c-format */
2101 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2102 else
2103 /* xgettext: c-format */
2104 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2105
2106 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2107 bfd_get_filename (obfd));
2108 }
2109 }
2110 else
2111 {
2112 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2113 }
2114 }
2115
2116 return true;
2117 }
2118
2119
2120 /* Display the flags field. */
2121
2122 static boolean
2123 coff_arm_print_private_bfd_data (abfd, ptr)
2124 bfd * abfd;
2125 PTR ptr;
2126 {
2127 FILE * file = (FILE *) ptr;
2128
2129 BFD_ASSERT (abfd != NULL && ptr != NULL);
2130
2131 /* xgettext:c-format */
2132 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2133
2134 if (APCS_SET (abfd))
2135 {
2136 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2137 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2138
2139 if (APCS_FLOAT_FLAG (abfd))
2140 fprintf (file, _(" [floats passed in float registers]"));
2141 else
2142 fprintf (file, _(" [floats passed in integer registers]"));
2143
2144 if (PIC_FLAG (abfd))
2145 fprintf (file, _(" [position independent]"));
2146 else
2147 fprintf (file, _(" [absolute position]"));
2148 }
2149
2150 if (! INTERWORK_SET (abfd))
2151 fprintf (file, _(" [interworking flag not initialised]"));
2152 else if (INTERWORK_FLAG (abfd))
2153 fprintf (file, _(" [interworking supported]"));
2154 else
2155 fprintf (file, _(" [interworking not supported]"));
2156
2157 fputc ('\n', file);
2158
2159 return true;
2160 }
2161
2162
2163 /* Copies the given flags into the coff_tdata.flags field.
2164 Typically these flags come from the f_flags[] field of
2165 the COFF filehdr structure, which contains important,
2166 target specific information.
2167 Note: Although this function is static, it is explicitly
2168 called from both coffcode.h and peicode.h. */
2169
2170 static boolean
2171 _bfd_coff_arm_set_private_flags (abfd, flags)
2172 bfd * abfd;
2173 flagword flags;
2174 {
2175 flagword flag;
2176
2177 BFD_ASSERT (abfd != NULL);
2178
2179 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2180
2181 /* Make sure that the APCS field has not been initialised to the opposite
2182 value. */
2183 if (APCS_SET (abfd)
2184 && ( (APCS_26_FLAG (abfd) != flag)
2185 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2186 || (PIC_FLAG (abfd) != (flags & F_PIC_INT ? F_PIC : 0))
2187 ))
2188 return false;
2189
2190 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2191
2192 SET_APCS_FLAGS (abfd, flag);
2193
2194 flag = (flags & F_INTERWORK);
2195
2196 /* If the BFD has already had its interworking flag set, but it
2197 is different from the value that we have been asked to set,
2198 then assume that that merged code will not support interworking
2199 and set the flag accordingly. */
2200 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2201 {
2202 if (flag)
2203 /* xgettext: c-format */
2204 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2205 bfd_get_filename (abfd));
2206 else
2207 /* xgettext: c-format */
2208 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2209 bfd_get_filename (abfd));
2210 flag = 0;
2211 }
2212
2213 SET_INTERWORK_FLAG (abfd, flag);
2214
2215 return true;
2216 }
2217
2218
2219 /* Copy the important parts of the target specific data
2220 from one instance of a BFD to another. */
2221
2222 static boolean
2223 coff_arm_copy_private_bfd_data (src, dest)
2224 bfd * src;
2225 bfd * dest;
2226 {
2227 BFD_ASSERT (src != NULL && dest != NULL);
2228
2229 if (src == dest)
2230 return true;
2231
2232 /* If the destination is not in the same format as the source, do not do
2233 the copy. */
2234 if (src->xvec != dest->xvec)
2235 return true;
2236
2237 /* copy the flags field */
2238 if (APCS_SET (src))
2239 {
2240 if (APCS_SET (dest))
2241 {
2242 /* If the src and dest have different APCS flag bits set, fail. */
2243 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2244 return false;
2245
2246 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2247 return false;
2248
2249 if (PIC_FLAG (dest) != PIC_FLAG (src))
2250 return false;
2251 }
2252 else
2253 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2254 | PIC_FLAG (src));
2255 }
2256
2257 if (INTERWORK_SET (src))
2258 {
2259 if (INTERWORK_SET (dest))
2260 {
2261 /* If the src and dest have different interworking flags then turn
2262 off the interworking bit. */
2263 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2264 {
2265 if (INTERWORK_FLAG (dest))
2266 {
2267 /* xgettext:c-format */
2268 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2269 bfd_get_filename (dest),
2270 bfd_get_filename (src));
2271 }
2272
2273 SET_INTERWORK_FLAG (dest, 0);
2274 }
2275 }
2276 else
2277 {
2278 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2279 }
2280 }
2281
2282 return true;
2283 }
2284
2285 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2286 *must* match the definitions in gcc/config/arm/coff.h and semi.h */
2287 #define LOCAL_LABEL_PREFIX "."
2288 #ifndef USER_LABEL_PREFIX
2289 #define USER_LABEL_PREFIX "_"
2290 #endif
2291
2292 static boolean
2293 coff_arm_is_local_label_name (abfd, name)
2294 bfd * abfd;
2295 const char * name;
2296 {
2297 #ifdef LOCAL_LABEL_PREFIX
2298 /* If there is a prefix for local labels then look for this.
2299 If the prefix exists, but it is empty, then ignore the test. */
2300
2301 if (LOCAL_LABEL_PREFIX[0] != 0)
2302 {
2303 if (strncmp (name, LOCAL_LABEL_PREFIX, strlen (LOCAL_LABEL_PREFIX)) == 0)
2304 return true;
2305 }
2306 #endif
2307 #ifdef USER_LABEL_PREFIX
2308 if (USER_LABEL_PREFIX[0] != 0)
2309 {
2310 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2311 return false;
2312 }
2313 #endif
2314
2315 /* devo/gcc/config/dbxcoff.h defines ASM_OUTPUT_SOURCE_LINE to generate
2316 local line numbers as .LM<number>, so treat these as local. */
2317
2318 switch (name[0])
2319 {
2320 case 'L': return true;
2321 case '.': return (name[1] == 'L' && name[2] == 'M') ? true : false;
2322 default: return false; /* Cannot make our minds up - default to
2323 false so that it will not be stripped
2324 by accident. */
2325 }
2326 }
2327
2328 /* This piece of machinery exists only to guarantee that the bfd that holds
2329 the glue section is written last.
2330
2331 This does depend on bfd_make_section attaching a new section to the
2332 end of the section list for the bfd.
2333
2334 krk@cygnus.com */
2335
2336 static boolean
2337 coff_arm_link_output_has_begun (sub, info)
2338 bfd * sub;
2339 struct coff_final_link_info * info;
2340 {
2341 return (sub->output_has_begun
2342 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2343 }
2344
2345 static boolean
2346 coff_arm_final_link_postscript (abfd, pfinfo)
2347 bfd * abfd;
2348 struct coff_final_link_info * pfinfo;
2349 {
2350 struct coff_arm_link_hash_table * globals;
2351
2352 globals = coff_arm_hash_table (pfinfo->info);
2353
2354 BFD_ASSERT (globals != NULL);
2355
2356 if (globals->bfd_of_glue_owner != NULL)
2357 {
2358 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2359 return false;
2360
2361 globals->bfd_of_glue_owner->output_has_begun = true;
2362 }
2363
2364 return true;
2365 }
2366
2367 #if 0
2368 #define coff_SWAP_sym_in arm_bfd_coff_swap_sym_in
2369
2370 static void coff_swap_sym_in PARAMS ((bfd *, PTR, PTR));
2371
2372 /* Sepcial version of symbol swapper, used to grab a bfd
2373 onto which the glue sections can be attached. */
2374 static void
2375 arm_bfd_coff_swap_sym_in (abfd, ext1, in1)
2376 bfd * abfd;
2377 PTR ext1;
2378 PTR in1;
2379 {
2380 flagword flags;
2381 register asection * s;
2382
2383 /* Do the normal swap in. */
2384 coff_swap_sym_in (abfd, ext1, in1);
2385
2386 if (bfd_of_glue_owner != NULL) /* we already have a toc, so go home */
2387 return;
2388
2389 /* Save the bfd for later allocation. */
2390 bfd_of_glue_owner = abfd;
2391
2392 s = bfd_get_section_by_name (bfd_of_glue_owner ,
2393 ARM2THUMB_GLUE_SECTION_NAME);
2394
2395 if (s == NULL)
2396 {
2397 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY ;
2398
2399 s = bfd_make_section (bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
2400
2401 if (s == NULL
2402 || !bfd_set_section_flags (bfd_of_glue_owner, s, flags)
2403 || !bfd_set_section_alignment (bfd_of_glue_owner, s, 2))
2404 {
2405 /* FIXME: set appropriate bfd error */
2406 abort();
2407 }
2408 }
2409
2410 s = bfd_get_section_by_name (bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
2411
2412 if (s == NULL)
2413 {
2414 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY ;
2415
2416 s = bfd_make_section (bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
2417
2418 if (s == NULL
2419 || !bfd_set_section_flags (bfd_of_glue_owner, s, flags)
2420 || !bfd_set_section_alignment (bfd_of_glue_owner, s, 2))
2421 {
2422 /* FIXME: set appropriate bfd error krk@cygnus.com */
2423 abort();
2424 }
2425 }
2426
2427 return;
2428 }
2429 #endif
2430
2431 #include "coffcode.h"
2432
2433 const bfd_target
2434 #ifdef TARGET_LITTLE_SYM
2435 TARGET_LITTLE_SYM =
2436 #else
2437 armcoff_little_vec =
2438 #endif
2439 {
2440 #ifdef TARGET_LITTLE_NAME
2441 TARGET_LITTLE_NAME,
2442 #else
2443 "coff-arm-little",
2444 #endif
2445 bfd_target_coff_flavour,
2446 BFD_ENDIAN_LITTLE, /* data byte order is little */
2447 BFD_ENDIAN_LITTLE, /* header byte order is little */
2448
2449 (HAS_RELOC | EXEC_P | /* object flags */
2450 HAS_LINENO | HAS_DEBUG |
2451 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
2452
2453 #ifndef COFF_WITH_PE
2454 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
2455 #else
2456 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
2457 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
2458 #endif
2459
2460 #ifdef TARGET_UNDERSCORE
2461 TARGET_UNDERSCORE, /* leading underscore */
2462 #else
2463 0, /* leading underscore */
2464 #endif
2465 '/', /* ar_pad_char */
2466 15, /* ar_max_namelen */
2467
2468 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
2469 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
2470 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
2471 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
2472 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
2473 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
2474
2475 /* Note that we allow an object file to be treated as a core file as well. */
2476 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
2477 bfd_generic_archive_p, coff_object_p},
2478 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
2479 bfd_false},
2480 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
2481 _bfd_write_archive_contents, bfd_false},
2482
2483 BFD_JUMP_TABLE_GENERIC (coff),
2484 BFD_JUMP_TABLE_COPY (coff),
2485 BFD_JUMP_TABLE_CORE (_bfd_nocore),
2486 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
2487 BFD_JUMP_TABLE_SYMBOLS (coff),
2488 BFD_JUMP_TABLE_RELOCS (coff),
2489 BFD_JUMP_TABLE_WRITE (coff),
2490 BFD_JUMP_TABLE_LINK (coff),
2491 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
2492
2493 (PTR) & bfd_coff_std_swap_table,
2494 };
2495
2496 const bfd_target
2497 #ifdef TARGET_BIG_SYM
2498 TARGET_BIG_SYM =
2499 #else
2500 armcoff_big_vec =
2501 #endif
2502 {
2503 #ifdef TARGET_BIG_NAME
2504 TARGET_BIG_NAME,
2505 #else
2506 "coff-arm-big",
2507 #endif
2508 bfd_target_coff_flavour,
2509 BFD_ENDIAN_BIG, /* data byte order is big */
2510 BFD_ENDIAN_BIG, /* header byte order is big */
2511
2512 (HAS_RELOC | EXEC_P | /* object flags */
2513 HAS_LINENO | HAS_DEBUG |
2514 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
2515
2516 #ifndef COFF_WITH_PE
2517 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
2518 #else
2519 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
2520 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
2521 #endif
2522
2523 #ifdef TARGET_UNDERSCORE
2524 TARGET_UNDERSCORE, /* leading underscore */
2525 #else
2526 0, /* leading underscore */
2527 #endif
2528 '/', /* ar_pad_char */
2529 15, /* ar_max_namelen */
2530
2531 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
2532 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
2533 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
2534 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
2535 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
2536 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
2537
2538 /* Note that we allow an object file to be treated as a core file as well. */
2539 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
2540 bfd_generic_archive_p, coff_object_p},
2541 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
2542 bfd_false},
2543 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
2544 _bfd_write_archive_contents, bfd_false},
2545
2546 BFD_JUMP_TABLE_GENERIC (coff),
2547 BFD_JUMP_TABLE_COPY (coff),
2548 BFD_JUMP_TABLE_CORE (_bfd_nocore),
2549 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
2550 BFD_JUMP_TABLE_SYMBOLS (coff),
2551 BFD_JUMP_TABLE_RELOCS (coff),
2552 BFD_JUMP_TABLE_WRITE (coff),
2553 BFD_JUMP_TABLE_LINK (coff),
2554 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
2555
2556 (PTR) & bfd_coff_std_swap_table,
2557 };
GDB Binutils - Deliverables
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