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* coff-arm.c (arm_emit_base_file_entry): Explicitly declare return
[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, 98, 1999
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 void
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 /*
938 Thumb->ARM: Thumb->(non-interworking aware) ARM
939
940 .thumb .thumb
941 .align 2 .align 2
942 __func_from_thumb: __func_from_thumb:
943 bx pc push {r6, lr}
944 nop ldr r6, __func_addr
945 .arm mov lr, pc
946 __func_change_to_arm: bx r6
947 b func .arm
948 __func_back_to_thumb:
949 ldmia r13! {r6, lr}
950 bx lr
951 __func_addr:
952 .word func
953 */
954
955 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
956 static const insn16 t2a1_bx_pc_insn = 0x4778;
957 static const insn16 t2a2_noop_insn = 0x46c0;
958 static const insn32 t2a3_b_insn = 0xea000000;
959
960 static const insn16 t2a1_push_insn = 0xb540;
961 static const insn16 t2a2_ldr_insn = 0x4e03;
962 static const insn16 t2a3_mov_insn = 0x46fe;
963 static const insn16 t2a4_bx_insn = 0x4730;
964 static const insn32 t2a5_pop_insn = 0xe8bd4040;
965 static const insn32 t2a6_bx_insn = 0xe12fff1e;
966
967 /* TODO:
968 We should really create new local (static) symbols in destination
969 object for each stub we create. We should also create local
970 (static) symbols within the stubs when switching between ARM and
971 Thumb code. This will ensure that the debugger and disassembler
972 can present a better view of stubs.
973
974 We can treat stubs like literal sections, and for the THUMB9 ones
975 (short addressing range) we should be able to insert the stubs
976 between sections. i.e. the simplest approach (since relocations
977 are done on a section basis) is to dump the stubs at the end of
978 processing a section. That way we can always try and minimise the
979 offset to and from a stub. However, this does not map well onto
980 the way that the linker/BFD does its work: mapping all input
981 sections to output sections via the linker script before doing
982 all the processing.
983
984 Unfortunately it may be easier to just to disallow short range
985 Thumb->ARM stubs (i.e. no conditional inter-working branches,
986 only branch-and-link (BL) calls. This will simplify the processing
987 since we can then put all of the stubs into their own section.
988
989 TODO:
990 On a different subject, rather than complaining when a
991 branch cannot fit in the number of bits available for the
992 instruction we should generate a trampoline stub (needed to
993 address the complete 32bit address space). */
994
995 /* The standard COFF backend linker does not cope with the special
996 Thumb BRANCH23 relocation. The alternative would be to split the
997 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
998 bit simpler simply providing our own relocation driver. */
999
1000 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1001 This code is a very slightly modified copy of
1002 _bfd_coff_generic_relocate_section. It would be a much more
1003 maintainable solution to have a MACRO that could be expanded within
1004 _bfd_coff_generic_relocate_section that would only be provided for
1005 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1006 is different from the original. */
1007
1008 static boolean
1009 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1010 contents, relocs, syms, sections)
1011 bfd *output_bfd;
1012 struct bfd_link_info *info;
1013 bfd *input_bfd;
1014 asection *input_section;
1015 bfd_byte *contents;
1016 struct internal_reloc *relocs;
1017 struct internal_syment *syms;
1018 asection **sections;
1019 {
1020 struct internal_reloc * rel;
1021 struct internal_reloc * relend;
1022
1023 rel = relocs;
1024 relend = rel + input_section->reloc_count;
1025
1026 for (; rel < relend; rel++)
1027 {
1028 int done = 0;
1029 long symndx;
1030 struct coff_link_hash_entry * h;
1031 struct internal_syment * sym;
1032 bfd_vma addend;
1033 bfd_vma val;
1034 reloc_howto_type * howto;
1035 bfd_reloc_status_type rstat;
1036 bfd_vma h_val;
1037
1038 symndx = rel->r_symndx;
1039
1040 if (symndx == -1)
1041 {
1042 h = NULL;
1043 sym = NULL;
1044 }
1045 else
1046 {
1047 h = obj_coff_sym_hashes (input_bfd)[symndx];
1048 sym = syms + symndx;
1049 }
1050
1051 /* COFF treats common symbols in one of two ways. Either the
1052 size of the symbol is included in the section contents, or it
1053 is not. We assume that the size is not included, and force
1054 the rtype_to_howto function to adjust the addend as needed. */
1055
1056 if (sym != NULL && sym->n_scnum != 0)
1057 addend = - sym->n_value;
1058 else
1059 addend = 0;
1060
1061
1062 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1063 sym, &addend);
1064 if (howto == NULL)
1065 return false;
1066
1067 /* The relocation_section function will skip pcrel_offset relocs
1068 when doing a relocateable link. However, we want to convert
1069 ARM26 to ARM26D relocs if possible. We return a fake howto in
1070 this case without pcrel_offset set, and adjust the addend to
1071 compensate. */
1072 if (rel->r_type == ARM_26
1073 && h != NULL
1074 && info->relocateable
1075 && (h->root.type == bfd_link_hash_defined
1076 || h->root.type == bfd_link_hash_defweak)
1077 && h->root.u.def.section->output_section == input_section->output_section)
1078 {
1079 static reloc_howto_type fake_arm26_reloc =
1080 HOWTO (ARM_26,
1081 2,
1082 2,
1083 24,
1084 true,
1085 0,
1086 complain_overflow_signed,
1087 aoutarm_fix_pcrel_26 ,
1088 "ARM_26",
1089 false,
1090 0x00ffffff,
1091 0x00ffffff,
1092 false);
1093
1094 addend -= rel->r_vaddr - input_section->vma;
1095 howto = &fake_arm26_reloc;
1096 }
1097
1098 /* If we are doing a relocateable link, then we can just ignore
1099 a PC relative reloc that is pcrel_offset. It will already
1100 have the correct value. If this is not a relocateable link,
1101 then we should ignore the symbol value. */
1102 if (howto->pc_relative && howto->pcrel_offset)
1103 {
1104 if (info->relocateable)
1105 continue;
1106 if (sym != NULL && sym->n_scnum != 0)
1107 addend += sym->n_value;
1108 }
1109
1110 val = 0;
1111
1112 if (h == NULL)
1113 {
1114 asection *sec;
1115
1116 if (symndx == -1)
1117 {
1118 sec = bfd_abs_section_ptr;
1119 val = 0;
1120 }
1121 else
1122 {
1123 sec = sections[symndx];
1124 val = (sec->output_section->vma
1125 + sec->output_offset
1126 + sym->n_value
1127 - sec->vma);
1128 }
1129 }
1130 else
1131 {
1132 #if 1 /* THUMBEXTENSION */
1133 /* We don't output the stubs if we are generating a
1134 relocatable output file, since we may as well leave the
1135 stub generation to the final linker pass. If we fail to
1136 verify that the name is defined, we'll try to build stubs
1137 for an undefined name... */
1138 if (! info->relocateable
1139 && ( h->root.type == bfd_link_hash_defined
1140 || h->root.type == bfd_link_hash_defweak))
1141 {
1142 asection * h_sec = h->root.u.def.section;
1143 const char * name = h->root.root.string;
1144
1145 /* h locates the symbol referenced in the reloc. */
1146 h_val = (h->root.u.def.value
1147 + h_sec->output_section->vma
1148 + h_sec->output_offset);
1149
1150 if (howto->type == ARM_26)
1151 {
1152 if ( h->class == C_THUMBSTATFUNC
1153 || h->class == C_THUMBEXTFUNC)
1154 {
1155 /* Arm code calling a Thumb function */
1156 unsigned long int tmp;
1157 long int my_offset;
1158 asection * s;
1159 long int ret_offset;
1160 struct coff_link_hash_entry * myh;
1161 struct coff_arm_link_hash_table * globals;
1162
1163 myh = find_arm_glue (info, name, input_bfd);
1164 if (myh == NULL)
1165 return false;
1166
1167 globals = coff_arm_hash_table (info);
1168
1169 BFD_ASSERT (globals != NULL);
1170 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1171
1172 my_offset = myh->root.u.def.value;
1173
1174 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1175 ARM2THUMB_GLUE_SECTION_NAME);
1176 BFD_ASSERT (s != NULL);
1177 BFD_ASSERT (s->contents != NULL);
1178 BFD_ASSERT (s->output_section != NULL);
1179
1180 if ((my_offset & 0x01) == 0x01)
1181 {
1182 if (h_sec->owner != NULL
1183 && INTERWORK_SET (h_sec->owner)
1184 && ! INTERWORK_FLAG (h_sec->owner))
1185 {
1186 _bfd_error_handler
1187 /* xgettext:c-format */
1188 (_("%s(%s): warning: interworking not enabled."),
1189 bfd_get_filename (h_sec->owner), name);
1190 _bfd_error_handler
1191 /* xgettext:c-format */
1192 (_(" first occurrence: %s: arm call to thumb"),
1193 bfd_get_filename (input_bfd));
1194 }
1195
1196 --my_offset;
1197 myh->root.u.def.value = my_offset;
1198
1199 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1200 s->contents + my_offset);
1201
1202 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1203 s->contents + my_offset + 4);
1204
1205 /* It's a thumb address. Add the low order bit. */
1206 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1207 s->contents + my_offset + 8);
1208
1209 if (info->base_file)
1210 arm_emit_base_file_entry (info, output_bfd, s,
1211 my_offset + 8);
1212
1213 }
1214
1215 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1216
1217 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1218 - input_section->vma);
1219
1220 tmp = tmp & 0xFF000000;
1221
1222 /* Somehow these are both 4 too far, so subtract 8. */
1223 ret_offset =
1224 s->output_offset
1225 + my_offset
1226 + s->output_section->vma
1227 - (input_section->output_offset
1228 + input_section->output_section->vma
1229 + rel->r_vaddr)
1230 - 8;
1231
1232 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1233
1234 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1235 - input_section->vma);
1236 done = 1;
1237 }
1238 }
1239
1240 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1241 else if (howto->type == ARM_THUMB23)
1242 {
1243 if ( h->class == C_EXT
1244 || h->class == C_STAT
1245 || h->class == C_LABEL)
1246 {
1247 /* Thumb code calling an ARM function */
1248 asection * s = 0;
1249 long int my_offset;
1250 unsigned long int tmp;
1251 long int ret_offset;
1252 struct coff_link_hash_entry * myh;
1253 struct coff_arm_link_hash_table * globals;
1254
1255 myh = find_thumb_glue (info, name, input_bfd);
1256 if (myh == NULL)
1257 return false;
1258
1259 globals = coff_arm_hash_table (info);
1260
1261 BFD_ASSERT (globals != NULL);
1262 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1263
1264 my_offset = myh->root.u.def.value;
1265
1266 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1267 THUMB2ARM_GLUE_SECTION_NAME);
1268
1269 BFD_ASSERT (s != NULL);
1270 BFD_ASSERT (s->contents != NULL);
1271 BFD_ASSERT (s->output_section != NULL);
1272
1273 if ((my_offset & 0x01) == 0x01)
1274 {
1275 if (h_sec->owner != NULL
1276 && INTERWORK_SET (h_sec->owner)
1277 && ! INTERWORK_FLAG (h_sec->owner)
1278 && ! globals->support_old_code)
1279 {
1280 _bfd_error_handler
1281 /* xgettext:c-format */
1282 (_("%s(%s): warning: interworking not enabled."),
1283 bfd_get_filename (h_sec->owner), name);
1284 _bfd_error_handler
1285 /* xgettext:c-format */
1286 (_(" first occurrence: %s: thumb call to arm"),
1287 bfd_get_filename (input_bfd));
1288 _bfd_error_handler
1289 (_(" consider relinking with --support-old-code enabled"));
1290 }
1291
1292 -- my_offset;
1293 myh->root.u.def.value = my_offset;
1294
1295 if (globals->support_old_code)
1296 {
1297 bfd_put_16 (output_bfd, t2a1_push_insn,
1298 s->contents + my_offset);
1299
1300 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1301 s->contents + my_offset + 2);
1302
1303 bfd_put_16 (output_bfd, t2a3_mov_insn,
1304 s->contents + my_offset + 4);
1305
1306 bfd_put_16 (output_bfd, t2a4_bx_insn,
1307 s->contents + my_offset + 6);
1308
1309 bfd_put_32 (output_bfd, t2a5_pop_insn,
1310 s->contents + my_offset + 8);
1311
1312 bfd_put_32 (output_bfd, t2a6_bx_insn,
1313 s->contents + my_offset + 12);
1314
1315 /* Store the address of the function in the last word of the stub. */
1316 bfd_put_32 (output_bfd, h_val,
1317 s->contents + my_offset + 16);
1318
1319 if (info->base_file)
1320 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1321 }
1322 else
1323 {
1324 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1325 s->contents + my_offset);
1326
1327 bfd_put_16 (output_bfd, t2a2_noop_insn,
1328 s->contents + my_offset + 2);
1329
1330 ret_offset =
1331 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1332 - ((bfd_signed_vma)
1333 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1334 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1335 + s->output_section->vma) /* Address of the start of the current section. */
1336 + 4 /* The branch instruction is 4 bytes into the stub. */
1337 + 8); /* ARM branches work from the pc of the instruction + 8. */
1338
1339 bfd_put_32 (output_bfd,
1340 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1341 s->contents + my_offset + 4);
1342
1343 }
1344 }
1345
1346 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1347
1348 /* Now go back and fix up the original BL insn to point
1349 to here. */
1350 ret_offset =
1351 s->output_offset
1352 + my_offset
1353 - (input_section->output_offset
1354 + rel->r_vaddr)
1355 -4;
1356
1357 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1358 - input_section->vma);
1359
1360 bfd_put_32 (output_bfd,
1361 insert_thumb_branch (tmp, ret_offset),
1362 contents + rel->r_vaddr
1363 - input_section->vma);
1364
1365 done = 1;
1366 }
1367 }
1368 }
1369
1370 /* If the relocation type and destination symbol does not
1371 fall into one of the above categories, then we can just
1372 perform a direct link. */
1373
1374 if (done)
1375 rstat = bfd_reloc_ok;
1376 else
1377 #endif /* THUMBEXTENSION */
1378 if ( h->root.type == bfd_link_hash_defined
1379 || h->root.type == bfd_link_hash_defweak)
1380 {
1381 asection *sec;
1382
1383 sec = h->root.u.def.section;
1384 val = (h->root.u.def.value
1385 + sec->output_section->vma
1386 + sec->output_offset);
1387 }
1388
1389 else if (! info->relocateable)
1390 {
1391 if (! ((*info->callbacks->undefined_symbol)
1392 (info, h->root.root.string, input_bfd, input_section,
1393 rel->r_vaddr - input_section->vma)))
1394 return false;
1395 }
1396 }
1397
1398 if (info->base_file)
1399 {
1400 /* Emit a reloc if the backend thinks it needs it. */
1401 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1402 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1403 }
1404
1405 #if 1 /* THUMBEXTENSION */
1406 if (done)
1407 rstat = bfd_reloc_ok;
1408 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1409 else if (! info->relocateable
1410 && howto->type == ARM_THUMB23)
1411 {
1412 /* This is pretty much a copy of what the default
1413 _bfd_final_link_relocate and _bfd_relocate_contents
1414 routines do to perform a relocation, with special
1415 processing for the split addressing of the Thumb BL
1416 instruction. Again, it would probably be simpler adding a
1417 ThumbBRANCH23 specific macro expansion into the default
1418 code. */
1419
1420 bfd_vma address = rel->r_vaddr - input_section->vma;
1421
1422 if (address > input_section->_raw_size)
1423 rstat = bfd_reloc_outofrange;
1424 else
1425 {
1426 bfd_vma relocation = val + addend;
1427 int size = bfd_get_reloc_size (howto);
1428 boolean overflow = false;
1429 bfd_byte * location = contents + address;
1430 bfd_vma x = bfd_get_32 (input_bfd, location);
1431 bfd_vma src_mask = 0x007FFFFE;
1432 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1433 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1434 bfd_vma check;
1435 bfd_signed_vma signed_check;
1436 bfd_vma add;
1437 bfd_signed_vma signed_add;
1438
1439 BFD_ASSERT (size == 4);
1440
1441 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1442 relocation -= (input_section->output_section->vma
1443 + input_section->output_offset);
1444
1445 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1446 relocation -= address;
1447
1448 /* No need to negate the relocation with BRANCH23. */
1449 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1450 /* howto->rightshift == 1 */
1451 /* Drop unwanted bits from the value we are relocating to. */
1452
1453 check = relocation >> howto->rightshift;
1454
1455 /* If this is a signed value, the rightshift just dropped
1456 leading 1 bits (assuming twos complement). */
1457 if ((bfd_signed_vma) relocation >= 0)
1458 signed_check = check;
1459 else
1460 signed_check = (check
1461 | ((bfd_vma) - 1
1462 & ~((bfd_vma) - 1 >> howto->rightshift)));
1463
1464 /* Get the value from the object file. */
1465 if (bfd_big_endian (input_bfd))
1466 {
1467 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1468 }
1469 else
1470 {
1471 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1472 }
1473
1474 /* Get the value from the object file with an appropriate sign.
1475 The expression involving howto->src_mask isolates the upper
1476 bit of src_mask. If that bit is set in the value we are
1477 adding, it is negative, and we subtract out that number times
1478 two. If src_mask includes the highest possible bit, then we
1479 can not get the upper bit, but that does not matter since
1480 signed_add needs no adjustment to become negative in that
1481 case. */
1482
1483 signed_add = add;
1484
1485 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1486 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1487
1488 /* Add the value from the object file, shifted so that it is a
1489 straight number. */
1490 /* howto->bitpos == 0 */
1491
1492 signed_check += signed_add;
1493 relocation += signed_add;
1494
1495 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1496
1497 /* Assumes two's complement. */
1498 if ( signed_check > reloc_signed_max
1499 || signed_check < reloc_signed_min)
1500 overflow = true;
1501
1502 /* Put RELOCATION into the correct bits: */
1503
1504 if (bfd_big_endian (input_bfd))
1505 {
1506 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1507 }
1508 else
1509 {
1510 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1511 }
1512
1513 /* Add RELOCATION to the correct bits of X: */
1514 x = ((x & ~howto->dst_mask) | relocation);
1515
1516 /* Put the relocated value back in the object file: */
1517 bfd_put_32 (input_bfd, x, location);
1518
1519 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1520 }
1521 }
1522 else
1523 #endif /* THUMBEXTENSION */
1524 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1525 contents,
1526 rel->r_vaddr - input_section->vma,
1527 val, addend);
1528 #if 1 /* THUMBEXTENSION */
1529 /* FIXME:
1530 Is this the best way to fix up thumb addresses? krk@cygnus.com
1531 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1532 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1533 if (! info->relocateable
1534 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1535 {
1536 /* Determine if we need to set the bottom bit of a relocated address
1537 because the address is the address of a Thumb code symbol. */
1538
1539 int patchit = false;
1540
1541 if (h != NULL
1542 && ( h->class == C_THUMBSTATFUNC
1543 || h->class == C_THUMBEXTFUNC))
1544 {
1545 patchit = true;
1546 }
1547 else if (sym != NULL
1548 && sym->n_scnum > N_UNDEF)
1549 {
1550 /* No hash entry - use the symbol instead. */
1551
1552 if ( sym->n_sclass == C_THUMBSTATFUNC
1553 || sym->n_sclass == C_THUMBEXTFUNC)
1554 patchit = true;
1555 }
1556
1557 if (patchit)
1558 {
1559 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1560 bfd_vma x = bfd_get_32 (input_bfd, location);
1561
1562 bfd_put_32 (input_bfd, x | 1, location);
1563 }
1564 }
1565 #endif /* THUMBEXTENSION */
1566
1567 switch (rstat)
1568 {
1569 default:
1570 abort ();
1571 case bfd_reloc_ok:
1572 break;
1573 case bfd_reloc_outofrange:
1574 (*_bfd_error_handler)
1575 (_("%s: bad reloc address 0x%lx in section `%s'"),
1576 bfd_get_filename (input_bfd),
1577 (unsigned long) rel->r_vaddr,
1578 bfd_get_section_name (input_bfd, input_section));
1579 return false;
1580 case bfd_reloc_overflow:
1581 {
1582 const char *name;
1583 char buf[SYMNMLEN + 1];
1584
1585 if (symndx == -1)
1586 name = "*ABS*";
1587 else if (h != NULL)
1588 name = h->root.root.string;
1589 else
1590 {
1591 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1592 if (name == NULL)
1593 return false;
1594 }
1595
1596 if (! ((*info->callbacks->reloc_overflow)
1597 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1598 input_section, rel->r_vaddr - input_section->vma)))
1599 return false;
1600 }
1601 }
1602 }
1603
1604 return true;
1605 }
1606
1607 #ifdef COFF_IMAGE_WITH_PE
1608 static
1609 #endif
1610 boolean
1611 bfd_arm_allocate_interworking_sections (info)
1612 struct bfd_link_info * info;
1613 {
1614 asection * s;
1615 bfd_byte * foo;
1616 struct coff_arm_link_hash_table * globals;
1617 #if 0
1618 static char test_char = '1';
1619 #endif
1620
1621 globals = coff_arm_hash_table (info);
1622
1623 BFD_ASSERT (globals != NULL);
1624
1625 if (globals->arm_glue_size != 0)
1626 {
1627 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1628
1629 s = bfd_get_section_by_name
1630 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1631
1632 BFD_ASSERT (s != NULL);
1633
1634 foo = (bfd_byte *) bfd_alloc
1635 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1636 #if 0
1637 memset (foo, test_char, globals->arm_glue_size);
1638 #endif
1639
1640 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1641 s->contents = foo;
1642 }
1643
1644 if (globals->thumb_glue_size != 0)
1645 {
1646 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1647
1648 s = bfd_get_section_by_name
1649 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1650
1651 BFD_ASSERT (s != NULL);
1652
1653 foo = (bfd_byte *) bfd_alloc
1654 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1655 #if 0
1656 memset (foo, test_char, globals->thumb_glue_size);
1657 #endif
1658
1659 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1660 s->contents = foo;
1661 }
1662
1663 return true;
1664 }
1665
1666 static void
1667 record_arm_to_thumb_glue (info, h)
1668 struct bfd_link_info * info;
1669 struct coff_link_hash_entry * h;
1670 {
1671 const char * name = h->root.root.string;
1672 register asection * s;
1673 char * tmp_name;
1674 struct coff_link_hash_entry * myh;
1675 struct coff_arm_link_hash_table * globals;
1676
1677 globals = coff_arm_hash_table (info);
1678
1679 BFD_ASSERT (globals != NULL);
1680 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1681
1682 s = bfd_get_section_by_name
1683 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1684
1685 BFD_ASSERT (s != NULL);
1686
1687 tmp_name = ((char *)
1688 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1689
1690 BFD_ASSERT (tmp_name);
1691
1692 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1693
1694 myh = coff_link_hash_lookup
1695 (coff_hash_table (info), tmp_name, false, false, true);
1696
1697 if (myh != NULL)
1698 {
1699 free (tmp_name);
1700 return; /* we've already seen this guy */
1701 }
1702
1703 /* The only trick here is using globals->arm_glue_size as the value. Even
1704 though the section isn't allocated yet, this is where we will be putting
1705 it. */
1706
1707 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1708 BSF_GLOBAL,
1709 s, globals->arm_glue_size + 1,
1710 NULL, true, false,
1711 (struct bfd_link_hash_entry **) & myh);
1712
1713 free (tmp_name);
1714
1715 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1716
1717 return;
1718 }
1719
1720 static void
1721 record_thumb_to_arm_glue (info, h)
1722 struct bfd_link_info * info;
1723 struct coff_link_hash_entry * h;
1724 {
1725 const char * name = h->root.root.string;
1726 register asection * s;
1727 char * tmp_name;
1728 struct coff_link_hash_entry * myh;
1729 struct coff_arm_link_hash_table * globals;
1730
1731
1732 globals = coff_arm_hash_table (info);
1733
1734 BFD_ASSERT (globals != NULL);
1735 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1736
1737 s = bfd_get_section_by_name
1738 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1739
1740 BFD_ASSERT (s != NULL);
1741
1742 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1743
1744 BFD_ASSERT (tmp_name);
1745
1746 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1747
1748 myh = coff_link_hash_lookup
1749 (coff_hash_table (info), tmp_name, false, false, true);
1750
1751 if (myh != NULL)
1752 {
1753 free (tmp_name);
1754 return; /* we've already seen this guy */
1755 }
1756
1757 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1758 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1759 NULL, true, false,
1760 (struct bfd_link_hash_entry **) & myh);
1761
1762 /* If we mark it 'thumb', the disassembler will do a better job. */
1763 myh->class = C_THUMBEXTFUNC;
1764
1765 free (tmp_name);
1766
1767 /* Allocate another symbol to mark where we switch to arm mode. */
1768
1769 #define CHANGE_TO_ARM "__%s_change_to_arm"
1770 #define BACK_FROM_ARM "__%s_back_from_arm"
1771
1772 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1773
1774 BFD_ASSERT (tmp_name);
1775
1776 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1777
1778 myh = NULL;
1779
1780 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1781 BSF_LOCAL, s, globals->thumb_glue_size
1782 + (globals->support_old_code ? 8 : 4),
1783 NULL, true, false,
1784 (struct bfd_link_hash_entry **) & myh);
1785
1786 free (tmp_name);
1787
1788 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1789
1790 return;
1791 }
1792
1793 /* Select a BFD to be used to hold the sections used by the glue code.
1794 This function is called from the linker scripts in ld/emultempl/
1795 {armcoff/pe}.em */
1796 #ifdef COFF_IMAGE_WITH_PE
1797 static
1798 #endif
1799 boolean
1800 bfd_arm_get_bfd_for_interworking (abfd, info)
1801 bfd * abfd;
1802 struct bfd_link_info * info;
1803 {
1804 struct coff_arm_link_hash_table * globals;
1805 flagword flags;
1806 asection * sec;
1807
1808 /* If we are only performing a partial link do not bother
1809 getting a bfd to hold the glue. */
1810 if (info->relocateable)
1811 return true;
1812
1813 globals = coff_arm_hash_table (info);
1814
1815 BFD_ASSERT (globals != NULL);
1816
1817 if (globals->bfd_of_glue_owner != NULL)
1818 return true;
1819
1820 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1821
1822 if (sec == NULL)
1823 {
1824 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
1825
1826 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1827
1828 if (sec == NULL
1829 || ! bfd_set_section_flags (abfd, sec, flags)
1830 || ! bfd_set_section_alignment (abfd, sec, 2))
1831 return false;
1832 }
1833
1834 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1835
1836 if (sec == NULL)
1837 {
1838 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
1839
1840 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1841
1842 if (sec == NULL
1843 || ! bfd_set_section_flags (abfd, sec, flags)
1844 || ! bfd_set_section_alignment (abfd, sec, 2))
1845 return false;
1846 }
1847
1848 /* Save the bfd for later use. */
1849 globals->bfd_of_glue_owner = abfd;
1850
1851 return true;
1852 }
1853
1854 #ifdef COFF_IMAGE_WITH_PE
1855 static
1856 #endif
1857 boolean
1858 bfd_arm_process_before_allocation (abfd, info, support_old_code)
1859 bfd * abfd;
1860 struct bfd_link_info * info;
1861 int support_old_code;
1862 {
1863 asection * sec;
1864 struct coff_arm_link_hash_table * globals;
1865
1866 /* If we are only performing a partial link do not bother
1867 to construct any glue. */
1868 if (info->relocateable)
1869 return true;
1870
1871 /* Here we have a bfd that is to be included on the link. We have a hook
1872 to do reloc rummaging, before section sizes are nailed down. */
1873
1874 _bfd_coff_get_external_symbols (abfd);
1875
1876 globals = coff_arm_hash_table (info);
1877
1878 BFD_ASSERT (globals != NULL);
1879 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1880
1881 globals->support_old_code = support_old_code;
1882
1883 /* Rummage around all the relocs and map the glue vectors. */
1884 sec = abfd->sections;
1885
1886 if (sec == NULL)
1887 return true;
1888
1889 for (; sec != NULL; sec = sec->next)
1890 {
1891 struct internal_reloc * i;
1892 struct internal_reloc * rel;
1893
1894 if (sec->reloc_count == 0)
1895 continue;
1896
1897 /* Load the relocs. */
1898 /* FIXME: there may be a storage leak here. */
1899
1900 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
1901
1902 BFD_ASSERT (i != 0);
1903
1904 for (rel = i; rel < i + sec->reloc_count; ++rel)
1905 {
1906 unsigned short r_type = rel->r_type;
1907 long symndx;
1908 struct coff_link_hash_entry * h;
1909
1910 symndx = rel->r_symndx;
1911
1912 /* If the relocation is not against a symbol it cannot concern us. */
1913 if (symndx == -1)
1914 continue;
1915
1916 h = obj_coff_sym_hashes (abfd)[symndx];
1917
1918 /* If the relocation is against a static symbol it must be within
1919 the current section and so cannot be a cross ARM/Thumb relocation. */
1920 if (h == NULL)
1921 continue;
1922
1923 switch (r_type)
1924 {
1925 case ARM_26:
1926 /* This one is a call from arm code. We need to look up
1927 the target of the call. If it is a thumb target, we
1928 insert glue. */
1929
1930 if (h->class == C_THUMBEXTFUNC)
1931 record_arm_to_thumb_glue (info, h);
1932 break;
1933
1934 case ARM_THUMB23:
1935 /* This one is a call from thumb code. We used to look
1936 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
1937 up the target of the call. If it is an arm target, we
1938 insert glue. If the symbol does not exist it will be
1939 given a class of C_EXT and so we will generate a stub
1940 for it. This is not really a problem, since the link
1941 is doomed anyway. */
1942
1943 switch (h->class)
1944 {
1945 case C_EXT:
1946 case C_STAT:
1947 case C_LABEL:
1948 record_thumb_to_arm_glue (info, h);
1949 break;
1950 default:
1951 ;
1952 }
1953 break;
1954
1955 default:
1956 break;
1957 }
1958 }
1959 }
1960
1961 return true;
1962 }
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))
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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