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Replace VXWORKS with ARM_COFF_BUGFIX.
[deliverable/binutils-gdb.git] / bfd / coff-arm.c
1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26
27 #include "coff/arm.h"
28
29 #include "coff/internal.h"
30
31 #ifdef COFF_WITH_PE
32 #include "coff/pe.h"
33 #endif
34
35 #include "libcoff.h"
36
37 /* Macros for manipulation the bits in the flags field of the coff data
38 structure. */
39 #define APCS_26_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_26)
40 #define APCS_FLOAT_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_FLOAT)
41 #define PIC_FLAG( abfd ) (coff_data (abfd)->flags & F_PIC)
42 #define APCS_SET( abfd ) (coff_data (abfd)->flags & F_APCS_SET)
43 #define SET_APCS_FLAGS( abfd, flgs) (coff_data (abfd)->flags = \
44 (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \
45 | (flgs | F_APCS_SET))
46 #define INTERWORK_FLAG( abfd ) (coff_data (abfd)->flags & F_INTERWORK)
47 #define INTERWORK_SET( abfd ) (coff_data (abfd)->flags & F_INTERWORK_SET)
48 #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \
49 (coff_data (abfd)->flags & ~ F_INTERWORK) \
50 | (flg | F_INTERWORK_SET))
51
52 #ifndef NUM_ELEM
53 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
54 #endif
55
56 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
57 /* some typedefs for holding instructions */
58 typedef unsigned long int insn32;
59 typedef unsigned short int insn16;
60
61 /* Forward declarations for stupid compilers. */
62 static boolean coff_arm_relocate_section
63 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
64 struct internal_reloc *, struct internal_syment *, asection **));
65 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
66 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
67 static bfd_reloc_status_type aoutarm_fix_pcrel_26
68 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
69 static bfd_reloc_status_type coff_thumb_pcrel_23
70 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
71 static bfd_reloc_status_type coff_thumb_pcrel_12
72 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
73 static bfd_reloc_status_type coff_thumb_pcrel_9
74 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
75 static bfd_reloc_status_type coff_arm_reloc
76 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
77 static boolean coff_arm_adjust_symndx
78 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
79 asection *, struct internal_reloc *, boolean *));
80 static reloc_howto_type * coff_arm_rtype_to_howto
81 PARAMS ((bfd *, asection *, struct internal_reloc *,
82 struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
83 static bfd_reloc_status_type coff_thumb_pcrel_common
84 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
85 thumb_pcrel_branchtype));
86 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
87 PARAMS ((bfd *, bfd_reloc_code_real_type));
88 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
89 PARAMS ((bfd *));
90 static insn32 insert_thumb_branch
91 PARAMS ((insn32, int));
92 static struct coff_link_hash_entry * find_thumb_glue
93 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
94 static struct coff_link_hash_entry * find_arm_glue
95 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
96 #ifndef COFF_IMAGE_WITH_PE
97 static void record_arm_to_thumb_glue
98 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
99 static void record_thumb_to_arm_glue
100 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
101 #endif
102 static boolean coff_arm_merge_private_bfd_data
103 PARAMS ((bfd *, bfd *));
104 static boolean coff_arm_print_private_bfd_data
105 PARAMS ((bfd *, PTR));
106 static boolean _bfd_coff_arm_set_private_flags
107 PARAMS ((bfd *, flagword));
108 static boolean coff_arm_copy_private_bfd_data
109 PARAMS ((bfd *, bfd *));
110 static boolean coff_arm_is_local_label_name
111 PARAMS ((bfd *, const char *));
112 static boolean coff_arm_link_output_has_begun
113 PARAMS ((bfd *, struct coff_final_link_info *));
114 static boolean coff_arm_final_link_postscript
115 PARAMS ((bfd *, struct coff_final_link_info *));
116
117 /* The linker script knows the section names for placement.
118 The entry_names are used to do simple name mangling on the stubs.
119 Given a function name, and its type, the stub can be found. The
120 name can be changed. The only requirement is the %s be present.
121 */
122
123 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
124 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
125
126 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
127 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
128
129 /* Used by the assembler. */
130 static bfd_reloc_status_type
131 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
132 error_message)
133 bfd *abfd;
134 arelent *reloc_entry;
135 asymbol *symbol ATTRIBUTE_UNUSED;
136 PTR data;
137 asection *input_section ATTRIBUTE_UNUSED;
138 bfd *output_bfd;
139 char **error_message ATTRIBUTE_UNUSED;
140 {
141 symvalue diff;
142 if (output_bfd == (bfd *) NULL)
143 return bfd_reloc_continue;
144
145 diff = reloc_entry->addend;
146
147 #define DOIT(x) \
148 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
149
150 if (diff != 0)
151 {
152 reloc_howto_type *howto = reloc_entry->howto;
153 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
154
155 switch (howto->size)
156 {
157 case 0:
158 {
159 char x = bfd_get_8 (abfd, addr);
160 DOIT (x);
161 bfd_put_8 (abfd, x, addr);
162 }
163 break;
164
165 case 1:
166 {
167 short x = bfd_get_16 (abfd, addr);
168 DOIT (x);
169 bfd_put_16 (abfd, x, addr);
170 }
171 break;
172
173 case 2:
174 {
175 long x = bfd_get_32 (abfd, addr);
176 DOIT (x);
177 bfd_put_32 (abfd, x, addr);
178 }
179 break;
180
181 default:
182 abort ();
183 }
184 }
185
186 /* Now let bfd_perform_relocation finish everything up. */
187 return bfd_reloc_continue;
188 }
189
190 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
191 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
192 should not. */
193 #ifndef TARGET_UNDERSCORE
194 #define TARGET_UNDERSCORE '_'
195 #endif
196
197 #ifndef PCRELOFFSET
198 #define PCRELOFFSET true
199 #endif
200
201 /* These most certainly belong somewhere else. Just had to get rid of
202 the manifest constants in the code. */
203 #define ARM_8 0
204 #define ARM_16 1
205 #define ARM_32 2
206 #define ARM_26 3
207 #define ARM_DISP8 4
208 #define ARM_DISP16 5
209 #define ARM_DISP32 6
210 #define ARM_26D 7
211 /* 8 is unused */
212 #define ARM_NEG16 9
213 #define ARM_NEG32 10
214 #define ARM_RVA32 11
215 #define ARM_THUMB9 12
216 #define ARM_THUMB12 13
217 #define ARM_THUMB23 14
218
219 #ifdef ARM_WINCE
220 #undef ARM_32
221 #undef ARM_RVA32
222 #undef ARM_26
223 #undef ARM_THUMB12
224 #undef ARM_26D
225
226 #define ARM_32 1
227 #define ARM_RVA32 2
228 #define ARM_26 3
229 #define ARM_THUMB12 4
230 #define ARM_26D 5
231 #define ARM_SECTION 14
232 #define ARM_SECREL 15
233 #endif
234
235 static reloc_howto_type aoutarm_std_reloc_howto[] =
236 {
237 /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
238 #ifdef ARM_WINCE
239 EMPTY_HOWTO (-1),
240 HOWTO (ARM_32,
241 0,
242 2,
243 32,
244 false,
245 0,
246 complain_overflow_bitfield,
247 coff_arm_reloc,
248 "ARM_32",
249 true,
250 0xffffffff,
251 0xffffffff,
252 PCRELOFFSET),
253 HOWTO (ARM_RVA32,
254 0,
255 2,
256 32,
257 false,
258 0,
259 complain_overflow_bitfield,
260 coff_arm_reloc,
261 "ARM_RVA32",
262 true,
263 0xffffffff,
264 0xffffffff,
265 PCRELOFFSET),
266 HOWTO (ARM_26,
267 2,
268 2,
269 24,
270 true,
271 0,
272 complain_overflow_signed,
273 aoutarm_fix_pcrel_26 ,
274 "ARM_26",
275 false,
276 0x00ffffff,
277 0x00ffffff,
278 PCRELOFFSET),
279 HOWTO (ARM_THUMB12,
280 1,
281 1,
282 11,
283 true,
284 0,
285 complain_overflow_signed,
286 coff_thumb_pcrel_12 ,
287 "ARM_THUMB12",
288 false,
289 0x000007ff,
290 0x000007ff,
291 PCRELOFFSET),
292 HOWTO (ARM_26D,
293 2,
294 2,
295 24,
296 false,
297 0,
298 complain_overflow_dont,
299 aoutarm_fix_pcrel_26_done,
300 "ARM_26D",
301 true,
302 0x00ffffff,
303 0x0,
304 false),
305 EMPTY_HOWTO (-1),
306 EMPTY_HOWTO (-1),
307 EMPTY_HOWTO (-1),
308 EMPTY_HOWTO (-1),
309 EMPTY_HOWTO (-1),
310 EMPTY_HOWTO (-1),
311 EMPTY_HOWTO (-1),
312 EMPTY_HOWTO (-1),
313 HOWTO (ARM_SECTION,
314 0,
315 1,
316 16,
317 false,
318 0,
319 complain_overflow_bitfield,
320 coff_arm_reloc,
321 "ARM_16",
322 true,
323 0x0000ffff,
324 0x0000ffff,
325 PCRELOFFSET),
326 HOWTO (ARM_SECREL,
327 0,
328 2,
329 32,
330 false,
331 0,
332 complain_overflow_bitfield,
333 coff_arm_reloc,
334 "ARM_32",
335 true,
336 0xffffffff,
337 0xffffffff,
338 PCRELOFFSET),
339 #else /* not ARM_WINCE */
340 HOWTO(ARM_8, /* type */
341 0, /* rightshift */
342 0, /* size */
343 8, /* bitsize */
344 false, /* pc_relative */
345 0, /* bitpos */
346 complain_overflow_bitfield, /* complain_on_overflow */
347 coff_arm_reloc, /* special_function */
348 "ARM_8", /* name */
349 true, /* partial_inplace */
350 0x000000ff, /* src_mask */
351 0x000000ff, /* dst_mask */
352 PCRELOFFSET /* pcrel_offset */),
353 HOWTO(ARM_16,
354 0,
355 1,
356 16,
357 false,
358 0,
359 complain_overflow_bitfield,
360 coff_arm_reloc,
361 "ARM_16",
362 true,
363 0x0000ffff,
364 0x0000ffff,
365 PCRELOFFSET),
366 HOWTO(ARM_32,
367 0,
368 2,
369 32,
370 false,
371 0,
372 complain_overflow_bitfield,
373 coff_arm_reloc,
374 "ARM_32",
375 true,
376 0xffffffff,
377 0xffffffff,
378 PCRELOFFSET),
379 HOWTO(ARM_26,
380 2,
381 2,
382 24,
383 true,
384 0,
385 complain_overflow_signed,
386 aoutarm_fix_pcrel_26 ,
387 "ARM_26",
388 false,
389 0x00ffffff,
390 0x00ffffff,
391 PCRELOFFSET),
392 HOWTO(ARM_DISP8,
393 0,
394 0,
395 8,
396 true,
397 0,
398 complain_overflow_signed,
399 coff_arm_reloc,
400 "ARM_DISP8",
401 true,
402 0x000000ff,
403 0x000000ff,
404 true),
405 HOWTO( ARM_DISP16,
406 0,
407 1,
408 16,
409 true,
410 0,
411 complain_overflow_signed,
412 coff_arm_reloc,
413 "ARM_DISP16",
414 true,
415 0x0000ffff,
416 0x0000ffff,
417 true),
418 HOWTO( ARM_DISP32,
419 0,
420 2,
421 32,
422 true,
423 0,
424 complain_overflow_signed,
425 coff_arm_reloc,
426 "ARM_DISP32",
427 true,
428 0xffffffff,
429 0xffffffff,
430 true),
431 HOWTO( ARM_26D,
432 2,
433 2,
434 24,
435 false,
436 0,
437 complain_overflow_dont,
438 aoutarm_fix_pcrel_26_done,
439 "ARM_26D",
440 true,
441 0x00ffffff,
442 0x0,
443 false),
444 /* 8 is unused */
445 EMPTY_HOWTO (-1),
446 HOWTO( ARM_NEG16,
447 0,
448 -1,
449 16,
450 false,
451 0,
452 complain_overflow_bitfield,
453 coff_arm_reloc,
454 "ARM_NEG16",
455 true,
456 0x0000ffff,
457 0x0000ffff,
458 false),
459 HOWTO( ARM_NEG32,
460 0,
461 -2,
462 32,
463 false,
464 0,
465 complain_overflow_bitfield,
466 coff_arm_reloc,
467 "ARM_NEG32",
468 true,
469 0xffffffff,
470 0xffffffff,
471 false),
472 HOWTO( ARM_RVA32,
473 0,
474 2,
475 32,
476 false,
477 0,
478 complain_overflow_bitfield,
479 coff_arm_reloc,
480 "ARM_RVA32",
481 true,
482 0xffffffff,
483 0xffffffff,
484 PCRELOFFSET),
485 HOWTO( ARM_THUMB9,
486 1,
487 1,
488 8,
489 true,
490 0,
491 complain_overflow_signed,
492 coff_thumb_pcrel_9 ,
493 "ARM_THUMB9",
494 false,
495 0x000000ff,
496 0x000000ff,
497 PCRELOFFSET),
498 HOWTO( ARM_THUMB12,
499 1,
500 1,
501 11,
502 true,
503 0,
504 complain_overflow_signed,
505 coff_thumb_pcrel_12 ,
506 "ARM_THUMB12",
507 false,
508 0x000007ff,
509 0x000007ff,
510 PCRELOFFSET),
511 HOWTO( ARM_THUMB23,
512 1,
513 2,
514 22,
515 true,
516 0,
517 complain_overflow_signed,
518 coff_thumb_pcrel_23 ,
519 "ARM_THUMB23",
520 false,
521 0x07ff07ff,
522 0x07ff07ff,
523 PCRELOFFSET)
524 #endif /* not ARM_WINCE */
525 };
526
527 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
528
529 #ifdef COFF_WITH_PE
530 /* Return true if this relocation should
531 appear in the output .reloc section. */
532
533 static boolean
534 in_reloc_p (abfd, howto)
535 bfd * abfd ATTRIBUTE_UNUSED;
536 reloc_howto_type * howto;
537 {
538 return !howto->pc_relative && howto->type != ARM_RVA32;
539 }
540 #endif
541
542 #define RTYPE2HOWTO(cache_ptr, dst) \
543 (cache_ptr)->howto = \
544 (dst)->r_type < NUM_RELOCS \
545 ? aoutarm_std_reloc_howto + (dst)->r_type \
546 : NULL
547
548 #define coff_rtype_to_howto coff_arm_rtype_to_howto
549
550 static reloc_howto_type *
551 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
552 bfd *abfd ATTRIBUTE_UNUSED;
553 asection *sec;
554 struct internal_reloc *rel;
555 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
556 struct internal_syment *sym ATTRIBUTE_UNUSED;
557 bfd_vma *addendp;
558 {
559 reloc_howto_type * howto;
560
561 if (rel->r_type >= NUM_RELOCS)
562 return NULL;
563
564 howto = aoutarm_std_reloc_howto + rel->r_type;
565
566 if (rel->r_type == ARM_RVA32)
567 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
568
569 return howto;
570 }
571 /* Used by the assembler. */
572
573 static bfd_reloc_status_type
574 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
575 output_bfd, error_message)
576 bfd *abfd ATTRIBUTE_UNUSED;
577 arelent *reloc_entry ATTRIBUTE_UNUSED;
578 asymbol *symbol ATTRIBUTE_UNUSED;
579 PTR data ATTRIBUTE_UNUSED;
580 asection *input_section ATTRIBUTE_UNUSED;
581 bfd *output_bfd ATTRIBUTE_UNUSED;
582 char **error_message ATTRIBUTE_UNUSED;
583 {
584 /* This is dead simple at present. */
585 return bfd_reloc_ok;
586 }
587
588 /* Used by the assembler. */
589
590 static bfd_reloc_status_type
591 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
592 output_bfd, error_message)
593 bfd *abfd;
594 arelent *reloc_entry;
595 asymbol *symbol;
596 PTR data;
597 asection *input_section;
598 bfd *output_bfd;
599 char **error_message ATTRIBUTE_UNUSED;
600 {
601 bfd_vma relocation;
602 bfd_size_type addr = reloc_entry->address;
603 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
604 bfd_reloc_status_type flag = bfd_reloc_ok;
605
606 /* If this is an undefined symbol, return error */
607 if (symbol->section == &bfd_und_section
608 && (symbol->flags & BSF_WEAK) == 0)
609 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
610
611 /* If the sections are different, and we are doing a partial relocation,
612 just ignore it for now. */
613 if (symbol->section->name != input_section->name
614 && output_bfd != (bfd *)NULL)
615 return bfd_reloc_continue;
616
617 relocation = (target & 0x00ffffff) << 2;
618 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
619 relocation += symbol->value;
620 relocation += symbol->section->output_section->vma;
621 relocation += symbol->section->output_offset;
622 relocation += reloc_entry->addend;
623 relocation -= input_section->output_section->vma;
624 relocation -= input_section->output_offset;
625 relocation -= addr;
626
627 if (relocation & 3)
628 return bfd_reloc_overflow;
629
630 /* Check for overflow */
631 if (relocation & 0x02000000)
632 {
633 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
634 flag = bfd_reloc_overflow;
635 }
636 else if (relocation & ~0x03ffffff)
637 flag = bfd_reloc_overflow;
638
639 target &= ~0x00ffffff;
640 target |= (relocation >> 2) & 0x00ffffff;
641 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
642
643 /* Now the ARM magic... Change the reloc type so that it is marked as done.
644 Strictly this is only necessary if we are doing a partial relocation. */
645 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
646
647 return flag;
648 }
649
650 static bfd_reloc_status_type
651 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
652 output_bfd, error_message, btype)
653 bfd *abfd;
654 arelent *reloc_entry;
655 asymbol *symbol;
656 PTR data;
657 asection *input_section;
658 bfd *output_bfd;
659 char **error_message ATTRIBUTE_UNUSED;
660 thumb_pcrel_branchtype btype;
661 {
662 bfd_vma relocation = 0;
663 bfd_size_type addr = reloc_entry->address;
664 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
665 bfd_reloc_status_type flag = bfd_reloc_ok;
666 bfd_vma dstmsk;
667 bfd_vma offmsk;
668 bfd_vma signbit;
669
670 /* NOTE: This routine is currently used by GAS, but not by the link
671 phase. */
672
673 switch (btype)
674 {
675 case b9:
676 dstmsk = 0x000000ff;
677 offmsk = 0x000001fe;
678 signbit = 0x00000100;
679 break;
680
681 case b12:
682 dstmsk = 0x000007ff;
683 offmsk = 0x00000ffe;
684 signbit = 0x00000800;
685 break;
686
687 case b23:
688 dstmsk = 0x07ff07ff;
689 offmsk = 0x007fffff;
690 signbit = 0x00400000;
691 break;
692
693 default:
694 abort ();
695 }
696
697 /* If this is an undefined symbol, return error */
698 if (symbol->section == &bfd_und_section
699 && (symbol->flags & BSF_WEAK) == 0)
700 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
701
702 /* If the sections are different, and we are doing a partial relocation,
703 just ignore it for now. */
704 if (symbol->section->name != input_section->name
705 && output_bfd != (bfd *)NULL)
706 return bfd_reloc_continue;
707
708 switch (btype)
709 {
710 case b9:
711 case b12:
712 relocation = ((target & dstmsk) << 1);
713 break;
714
715 case b23:
716 if (bfd_big_endian (abfd))
717 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
718 else
719 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
720 break;
721
722 default:
723 abort ();
724 }
725
726 relocation = (relocation ^ signbit) - signbit; /* Sign extend */
727 relocation += symbol->value;
728 relocation += symbol->section->output_section->vma;
729 relocation += symbol->section->output_offset;
730 relocation += reloc_entry->addend;
731 relocation -= input_section->output_section->vma;
732 relocation -= input_section->output_offset;
733 relocation -= addr;
734
735 if (relocation & 1)
736 return bfd_reloc_overflow;
737
738 /* Check for overflow */
739 if (relocation & signbit)
740 {
741 if ((relocation & ~offmsk) != ~offmsk)
742 flag = bfd_reloc_overflow;
743 }
744 else if (relocation & ~offmsk)
745 flag = bfd_reloc_overflow;
746
747 target &= ~dstmsk;
748 switch (btype)
749 {
750 case b9:
751 case b12:
752 target |= (relocation >> 1);
753 break;
754
755 case b23:
756 if (bfd_big_endian (abfd))
757 target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000);
758 else
759 target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
760 break;
761
762 default:
763 abort ();
764 }
765
766 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
767
768 /* Now the ARM magic... Change the reloc type so that it is marked as done.
769 Strictly this is only necessary if we are doing a partial relocation. */
770 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
771
772 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations */
773 return flag;
774 }
775
776 static bfd_reloc_status_type
777 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
778 output_bfd, error_message)
779 bfd *abfd;
780 arelent *reloc_entry;
781 asymbol *symbol;
782 PTR data;
783 asection *input_section;
784 bfd *output_bfd;
785 char **error_message;
786 {
787 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
788 input_section, output_bfd, error_message, b23);
789 }
790
791 static bfd_reloc_status_type
792 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
793 output_bfd, error_message)
794 bfd *abfd;
795 arelent *reloc_entry;
796 asymbol *symbol;
797 PTR data;
798 asection *input_section;
799 bfd *output_bfd;
800 char **error_message;
801 {
802 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
803 input_section, output_bfd, error_message, b12);
804 }
805
806 static bfd_reloc_status_type
807 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
808 output_bfd, error_message)
809 bfd *abfd;
810 arelent *reloc_entry;
811 asymbol *symbol;
812 PTR data;
813 asection *input_section;
814 bfd *output_bfd;
815 char **error_message;
816 {
817 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
818 input_section, output_bfd, error_message, b9);
819 }
820
821 static CONST struct reloc_howto_struct *
822 coff_arm_reloc_type_lookup (abfd, code)
823 bfd * abfd;
824 bfd_reloc_code_real_type code;
825 {
826 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
827
828 if (code == BFD_RELOC_CTOR)
829 switch (bfd_get_arch_info (abfd)->bits_per_address)
830 {
831 case 32:
832 code = BFD_RELOC_32;
833 break;
834 default: return (CONST struct reloc_howto_struct *) 0;
835 }
836
837 switch (code)
838 {
839 #ifdef ARM_WINCE
840 ASTD (BFD_RELOC_32, ARM_32);
841 ASTD (BFD_RELOC_RVA, ARM_RVA32);
842 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
843 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
844 #else
845 ASTD (BFD_RELOC_8, ARM_8);
846 ASTD (BFD_RELOC_16, ARM_16);
847 ASTD (BFD_RELOC_32, ARM_32);
848 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
849 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
850 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
851 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
852 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
853 ASTD (BFD_RELOC_RVA, ARM_RVA32);
854 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
855 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
856 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
857 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
858 #endif
859 default: return (CONST struct reloc_howto_struct *) 0;
860 }
861 }
862
863 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
864 #define COFF_PAGE_SIZE 0x1000
865 /* Turn a howto into a reloc nunmber */
866
867 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
868 #define BADMAG(x) ARMBADMAG(x)
869 #define ARM 1 /* Customize coffcode.h */
870
871 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
872 This allows us to store global data here without actually creating any
873 global variables, which is a no-no in the BFD world. */
874 struct coff_arm_link_hash_table
875 {
876 /* The original coff_link_hash_table structure. MUST be first field. */
877 struct coff_link_hash_table root;
878
879 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
880 long int thumb_glue_size;
881
882 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
883 long int arm_glue_size;
884
885 /* An arbitary input BFD chosen to hold the glue sections. */
886 bfd * bfd_of_glue_owner;
887
888 /* Support interworking with old, non-interworking aware ARM code. */
889 int support_old_code;
890 };
891
892 /* Get the ARM coff linker hash table from a link_info structure. */
893 #define coff_arm_hash_table(info) \
894 ((struct coff_arm_link_hash_table *) ((info)->hash))
895
896 /* Create an ARM coff linker hash table. */
897
898 static struct bfd_link_hash_table *
899 coff_arm_link_hash_table_create (abfd)
900 bfd * abfd;
901 {
902 struct coff_arm_link_hash_table * ret;
903
904 ret = ((struct coff_arm_link_hash_table *)
905 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
906 if (ret == (struct coff_arm_link_hash_table *) NULL)
907 return NULL;
908
909 if (! _bfd_coff_link_hash_table_init
910 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
911 {
912 bfd_release (abfd, ret);
913 return (struct bfd_link_hash_table *) NULL;
914 }
915
916 ret->thumb_glue_size = 0;
917 ret->arm_glue_size = 0;
918 ret->bfd_of_glue_owner = NULL;
919
920 return & ret->root.root;
921 }
922
923 static void
924 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
925 struct bfd_link_info *info;
926 bfd *output_bfd;
927 asection *input_section;
928 bfd_vma reloc_offset;
929 {
930 bfd_vma addr = reloc_offset
931 - input_section->vma
932 + input_section->output_offset
933 + input_section->output_section->vma;
934
935 if (coff_data(output_bfd)->pe)
936 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
937 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
938
939 }
940 \f
941 /* The thumb form of a long branch is a bit finicky, because the offset
942 encoding is split over two fields, each in it's own instruction. They
943 can occur in any order. So given a thumb form of long branch, and an
944 offset, insert the offset into the thumb branch and return finished
945 instruction.
946
947 It takes two thumb instructions to encode the target address. Each has
948 11 bits to invest. The upper 11 bits are stored in one (identifed by
949 H-0.. see below), the lower 11 bits are stored in the other (identified
950 by H-1).
951
952 Combine together and shifted left by 1 (it's a half word address) and
953 there you have it.
954
955 Op: 1111 = F,
956 H-0, upper address-0 = 000
957 Op: 1111 = F,
958 H-1, lower address-0 = 800
959
960 They can be ordered either way, but the arm tools I've seen always put
961 the lower one first. It probably doesn't matter. krk@cygnus.com
962
963 XXX: Actually the order does matter. The second instruction (H-1)
964 moves the computed address into the PC, so it must be the second one
965 in the sequence. The problem, however is that whilst little endian code
966 stores the instructions in HI then LOW order, big endian code does the
967 reverse. nickc@cygnus.com */
968
969 #define LOW_HI_ORDER 0xF800F000
970 #define HI_LOW_ORDER 0xF000F800
971
972 static insn32
973 insert_thumb_branch (br_insn, rel_off)
974 insn32 br_insn;
975 int rel_off;
976 {
977 unsigned int low_bits;
978 unsigned int high_bits;
979
980 BFD_ASSERT((rel_off & 1) != 1);
981
982 rel_off >>= 1; /* half word aligned address */
983 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
984 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
985
986 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
987 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
988 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
989 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
990 else
991 abort (); /* error - not a valid branch instruction form */
992
993 /* FIXME: abort is probably not the right call. krk@cygnus.com */
994
995 return br_insn;
996 }
997 \f
998 static struct coff_link_hash_entry *
999 find_thumb_glue (info, name, input_bfd)
1000 struct bfd_link_info * info;
1001 CONST char * name;
1002 bfd * input_bfd;
1003 {
1004 char * tmp_name;
1005 struct coff_link_hash_entry * myh;
1006
1007 tmp_name = ((char *)
1008 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1009
1010 BFD_ASSERT (tmp_name);
1011
1012 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1013
1014 myh = coff_link_hash_lookup
1015 (coff_hash_table (info), tmp_name, false, false, true);
1016
1017 if (myh == NULL)
1018 /* xgettext:c-format */
1019 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1020 bfd_get_filename (input_bfd), tmp_name, name);
1021
1022 free (tmp_name);
1023
1024 return myh;
1025 }
1026
1027 static struct coff_link_hash_entry *
1028 find_arm_glue (info, name, input_bfd)
1029 struct bfd_link_info * info;
1030 CONST char * name;
1031 bfd * input_bfd;
1032 {
1033 char * tmp_name;
1034 struct coff_link_hash_entry * myh;
1035
1036 tmp_name = ((char *)
1037 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1038
1039 BFD_ASSERT (tmp_name);
1040
1041 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1042
1043 myh = coff_link_hash_lookup
1044 (coff_hash_table (info), tmp_name, false, false, true);
1045
1046 if (myh == NULL)
1047 /* xgettext:c-format */
1048 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1049 bfd_get_filename (input_bfd), tmp_name, name);
1050
1051 free (tmp_name);
1052
1053 return myh;
1054 }
1055
1056 /*
1057 ARM->Thumb glue:
1058
1059 .arm
1060 __func_from_arm:
1061 ldr r12, __func_addr
1062 bx r12
1063 __func_addr:
1064 .word func @ behave as if you saw a ARM_32 reloc
1065 */
1066
1067 #define ARM2THUMB_GLUE_SIZE 12
1068 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1069 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1070 static const insn32 a2t3_func_addr_insn = 0x00000001;
1071
1072 /*
1073 Thumb->ARM: Thumb->(non-interworking aware) ARM
1074
1075 .thumb .thumb
1076 .align 2 .align 2
1077 __func_from_thumb: __func_from_thumb:
1078 bx pc push {r6, lr}
1079 nop ldr r6, __func_addr
1080 .arm mov lr, pc
1081 __func_change_to_arm: bx r6
1082 b func .arm
1083 __func_back_to_thumb:
1084 ldmia r13! {r6, lr}
1085 bx lr
1086 __func_addr:
1087 .word func
1088 */
1089
1090 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1091 static const insn16 t2a1_bx_pc_insn = 0x4778;
1092 static const insn16 t2a2_noop_insn = 0x46c0;
1093 static const insn32 t2a3_b_insn = 0xea000000;
1094
1095 static const insn16 t2a1_push_insn = 0xb540;
1096 static const insn16 t2a2_ldr_insn = 0x4e03;
1097 static const insn16 t2a3_mov_insn = 0x46fe;
1098 static const insn16 t2a4_bx_insn = 0x4730;
1099 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1100 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1101
1102 /* TODO:
1103 We should really create new local (static) symbols in destination
1104 object for each stub we create. We should also create local
1105 (static) symbols within the stubs when switching between ARM and
1106 Thumb code. This will ensure that the debugger and disassembler
1107 can present a better view of stubs.
1108
1109 We can treat stubs like literal sections, and for the THUMB9 ones
1110 (short addressing range) we should be able to insert the stubs
1111 between sections. i.e. the simplest approach (since relocations
1112 are done on a section basis) is to dump the stubs at the end of
1113 processing a section. That way we can always try and minimise the
1114 offset to and from a stub. However, this does not map well onto
1115 the way that the linker/BFD does its work: mapping all input
1116 sections to output sections via the linker script before doing
1117 all the processing.
1118
1119 Unfortunately it may be easier to just to disallow short range
1120 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1121 only branch-and-link (BL) calls. This will simplify the processing
1122 since we can then put all of the stubs into their own section.
1123
1124 TODO:
1125 On a different subject, rather than complaining when a
1126 branch cannot fit in the number of bits available for the
1127 instruction we should generate a trampoline stub (needed to
1128 address the complete 32bit address space). */
1129
1130 /* The standard COFF backend linker does not cope with the special
1131 Thumb BRANCH23 relocation. The alternative would be to split the
1132 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1133 bit simpler simply providing our own relocation driver. */
1134
1135 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1136 This code is a very slightly modified copy of
1137 _bfd_coff_generic_relocate_section. It would be a much more
1138 maintainable solution to have a MACRO that could be expanded within
1139 _bfd_coff_generic_relocate_section that would only be provided for
1140 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1141 is different from the original. */
1142
1143 static boolean
1144 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1145 contents, relocs, syms, sections)
1146 bfd *output_bfd;
1147 struct bfd_link_info *info;
1148 bfd *input_bfd;
1149 asection *input_section;
1150 bfd_byte *contents;
1151 struct internal_reloc *relocs;
1152 struct internal_syment *syms;
1153 asection **sections;
1154 {
1155 struct internal_reloc * rel;
1156 struct internal_reloc * relend;
1157
1158 rel = relocs;
1159 relend = rel + input_section->reloc_count;
1160
1161 for (; rel < relend; rel++)
1162 {
1163 int done = 0;
1164 long symndx;
1165 struct coff_link_hash_entry * h;
1166 struct internal_syment * sym;
1167 bfd_vma addend;
1168 bfd_vma val;
1169 reloc_howto_type * howto;
1170 bfd_reloc_status_type rstat;
1171 bfd_vma h_val;
1172
1173 symndx = rel->r_symndx;
1174
1175 if (symndx == -1)
1176 {
1177 h = NULL;
1178 sym = NULL;
1179 }
1180 else
1181 {
1182 h = obj_coff_sym_hashes (input_bfd)[symndx];
1183 sym = syms + symndx;
1184 }
1185
1186 /* COFF treats common symbols in one of two ways. Either the
1187 size of the symbol is included in the section contents, or it
1188 is not. We assume that the size is not included, and force
1189 the rtype_to_howto function to adjust the addend as needed. */
1190
1191 if (sym != NULL && sym->n_scnum != 0)
1192 addend = - sym->n_value;
1193 else
1194 addend = 0;
1195
1196 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1197 sym, &addend);
1198 if (howto == NULL)
1199 return false;
1200
1201 /* The relocation_section function will skip pcrel_offset relocs
1202 when doing a relocateable link. However, we want to convert
1203 ARM26 to ARM26D relocs if possible. We return a fake howto in
1204 this case without pcrel_offset set, and adjust the addend to
1205 compensate. */
1206 if (rel->r_type == ARM_26
1207 && h != NULL
1208 && info->relocateable
1209 && (h->root.type == bfd_link_hash_defined
1210 || h->root.type == bfd_link_hash_defweak)
1211 && h->root.u.def.section->output_section == input_section->output_section)
1212 {
1213 static reloc_howto_type fake_arm26_reloc =
1214 HOWTO (ARM_26,
1215 2,
1216 2,
1217 24,
1218 true,
1219 0,
1220 complain_overflow_signed,
1221 aoutarm_fix_pcrel_26 ,
1222 "ARM_26",
1223 false,
1224 0x00ffffff,
1225 0x00ffffff,
1226 false);
1227
1228 addend -= rel->r_vaddr - input_section->vma;
1229 howto = &fake_arm26_reloc;
1230 }
1231
1232 #ifdef ARM_WINCE
1233 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1234 the next opcode's pc, so is off by one. */
1235 if (howto->pc_relative && !info->relocateable)
1236 addend -= 8;
1237 #endif
1238
1239 /* If we are doing a relocateable link, then we can just ignore
1240 a PC relative reloc that is pcrel_offset. It will already
1241 have the correct value. If this is not a relocateable link,
1242 then we should ignore the symbol value. */
1243 if (howto->pc_relative && howto->pcrel_offset)
1244 {
1245 if (info->relocateable)
1246 continue;
1247 /* FIXME - it is not clear which targets need this next test
1248 and which do not. It is known that it is needed for the
1249 VxWorks and EPOC-PE targets, but it is also known that it
1250 was supressed for other ARM targets. This ought to be
1251 sorted out one day. */
1252 #ifdef ARM_COFF_BUGFIX
1253 /* We must not ignore the symbol value. If the symbol is
1254 within the same section, the relocation should have already
1255 been fixed, but if it is not, we'll be handed a reloc into
1256 the beginning of the symbol's section, so we must not cancel
1257 out the symbol's value, otherwise we'll be adding it in
1258 twice. */
1259 if (sym != NULL && sym->n_scnum != 0)
1260 addend += sym->n_value;
1261 #endif
1262 }
1263
1264 val = 0;
1265
1266 if (h == NULL)
1267 {
1268 asection *sec;
1269
1270 if (symndx == -1)
1271 {
1272 sec = bfd_abs_section_ptr;
1273 val = 0;
1274 }
1275 else
1276 {
1277 sec = sections[symndx];
1278 val = (sec->output_section->vma
1279 + sec->output_offset
1280 + sym->n_value
1281 - sec->vma);
1282 }
1283 }
1284 else
1285 {
1286 #if 1 /* THUMBEXTENSION */
1287 /* We don't output the stubs if we are generating a
1288 relocatable output file, since we may as well leave the
1289 stub generation to the final linker pass. If we fail to
1290 verify that the name is defined, we'll try to build stubs
1291 for an undefined name... */
1292 if (! info->relocateable
1293 && ( h->root.type == bfd_link_hash_defined
1294 || h->root.type == bfd_link_hash_defweak))
1295 {
1296 asection * h_sec = h->root.u.def.section;
1297 const char * name = h->root.root.string;
1298
1299 /* h locates the symbol referenced in the reloc. */
1300 h_val = (h->root.u.def.value
1301 + h_sec->output_section->vma
1302 + h_sec->output_offset);
1303
1304 if (howto->type == ARM_26)
1305 {
1306 if ( h->class == C_THUMBSTATFUNC
1307 || h->class == C_THUMBEXTFUNC)
1308 {
1309 /* Arm code calling a Thumb function */
1310 unsigned long int tmp;
1311 long int my_offset;
1312 asection * s;
1313 long int ret_offset;
1314 struct coff_link_hash_entry * myh;
1315 struct coff_arm_link_hash_table * globals;
1316
1317 myh = find_arm_glue (info, name, input_bfd);
1318 if (myh == NULL)
1319 return false;
1320
1321 globals = coff_arm_hash_table (info);
1322
1323 BFD_ASSERT (globals != NULL);
1324 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1325
1326 my_offset = myh->root.u.def.value;
1327
1328 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1329 ARM2THUMB_GLUE_SECTION_NAME);
1330 BFD_ASSERT (s != NULL);
1331 BFD_ASSERT (s->contents != NULL);
1332 BFD_ASSERT (s->output_section != NULL);
1333
1334 if ((my_offset & 0x01) == 0x01)
1335 {
1336 if (h_sec->owner != NULL
1337 && INTERWORK_SET (h_sec->owner)
1338 && ! INTERWORK_FLAG (h_sec->owner))
1339 {
1340 _bfd_error_handler
1341 /* xgettext:c-format */
1342 (_("%s(%s): warning: interworking not enabled."),
1343 bfd_get_filename (h_sec->owner), name);
1344 _bfd_error_handler
1345 /* xgettext:c-format */
1346 (_(" first occurrence: %s: arm call to thumb"),
1347 bfd_get_filename (input_bfd));
1348 }
1349
1350 --my_offset;
1351 myh->root.u.def.value = my_offset;
1352
1353 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1354 s->contents + my_offset);
1355
1356 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1357 s->contents + my_offset + 4);
1358
1359 /* It's a thumb address. Add the low order bit. */
1360 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1361 s->contents + my_offset + 8);
1362
1363 if (info->base_file)
1364 arm_emit_base_file_entry (info, output_bfd, s,
1365 my_offset + 8);
1366
1367 }
1368
1369 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1370
1371 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1372 - input_section->vma);
1373
1374 tmp = tmp & 0xFF000000;
1375
1376 /* Somehow these are both 4 too far, so subtract 8. */
1377 ret_offset =
1378 s->output_offset
1379 + my_offset
1380 + s->output_section->vma
1381 - (input_section->output_offset
1382 + input_section->output_section->vma
1383 + rel->r_vaddr)
1384 - 8;
1385
1386 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1387
1388 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1389 - input_section->vma);
1390 done = 1;
1391 }
1392 }
1393
1394 #ifndef ARM_WINCE
1395 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1396 else if (howto->type == ARM_THUMB23)
1397 {
1398 if ( h->class == C_EXT
1399 || h->class == C_STAT
1400 || h->class == C_LABEL)
1401 {
1402 /* Thumb code calling an ARM function */
1403 asection * s = 0;
1404 long int my_offset;
1405 unsigned long int tmp;
1406 long int ret_offset;
1407 struct coff_link_hash_entry * myh;
1408 struct coff_arm_link_hash_table * globals;
1409
1410 myh = find_thumb_glue (info, name, input_bfd);
1411 if (myh == NULL)
1412 return false;
1413
1414 globals = coff_arm_hash_table (info);
1415
1416 BFD_ASSERT (globals != NULL);
1417 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1418
1419 my_offset = myh->root.u.def.value;
1420
1421 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1422 THUMB2ARM_GLUE_SECTION_NAME);
1423
1424 BFD_ASSERT (s != NULL);
1425 BFD_ASSERT (s->contents != NULL);
1426 BFD_ASSERT (s->output_section != NULL);
1427
1428 if ((my_offset & 0x01) == 0x01)
1429 {
1430 if (h_sec->owner != NULL
1431 && INTERWORK_SET (h_sec->owner)
1432 && ! INTERWORK_FLAG (h_sec->owner)
1433 && ! globals->support_old_code)
1434 {
1435 _bfd_error_handler
1436 /* xgettext:c-format */
1437 (_("%s(%s): warning: interworking not enabled."),
1438 bfd_get_filename (h_sec->owner), name);
1439 _bfd_error_handler
1440 /* xgettext:c-format */
1441 (_(" first occurrence: %s: thumb call to arm"),
1442 bfd_get_filename (input_bfd));
1443 _bfd_error_handler
1444 (_(" consider relinking with --support-old-code enabled"));
1445 }
1446
1447 -- my_offset;
1448 myh->root.u.def.value = my_offset;
1449
1450 if (globals->support_old_code)
1451 {
1452 bfd_put_16 (output_bfd, t2a1_push_insn,
1453 s->contents + my_offset);
1454
1455 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1456 s->contents + my_offset + 2);
1457
1458 bfd_put_16 (output_bfd, t2a3_mov_insn,
1459 s->contents + my_offset + 4);
1460
1461 bfd_put_16 (output_bfd, t2a4_bx_insn,
1462 s->contents + my_offset + 6);
1463
1464 bfd_put_32 (output_bfd, t2a5_pop_insn,
1465 s->contents + my_offset + 8);
1466
1467 bfd_put_32 (output_bfd, t2a6_bx_insn,
1468 s->contents + my_offset + 12);
1469
1470 /* Store the address of the function in the last word of the stub. */
1471 bfd_put_32 (output_bfd, h_val,
1472 s->contents + my_offset + 16);
1473
1474 if (info->base_file)
1475 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1476 }
1477 else
1478 {
1479 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1480 s->contents + my_offset);
1481
1482 bfd_put_16 (output_bfd, t2a2_noop_insn,
1483 s->contents + my_offset + 2);
1484
1485 ret_offset =
1486 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1487 - ((bfd_signed_vma)
1488 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1489 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1490 + s->output_section->vma) /* Address of the start of the current section. */
1491 + 4 /* The branch instruction is 4 bytes into the stub. */
1492 + 8); /* ARM branches work from the pc of the instruction + 8. */
1493
1494 bfd_put_32 (output_bfd,
1495 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1496 s->contents + my_offset + 4);
1497
1498 }
1499 }
1500
1501 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1502
1503 /* Now go back and fix up the original BL insn to point
1504 to here. */
1505 ret_offset =
1506 s->output_offset
1507 + my_offset
1508 - (input_section->output_offset
1509 + rel->r_vaddr)
1510 -4;
1511
1512 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1513 - input_section->vma);
1514
1515 bfd_put_32 (output_bfd,
1516 insert_thumb_branch (tmp, ret_offset),
1517 contents + rel->r_vaddr
1518 - input_section->vma);
1519
1520 done = 1;
1521 }
1522 }
1523 #endif
1524 }
1525
1526 /* If the relocation type and destination symbol does not
1527 fall into one of the above categories, then we can just
1528 perform a direct link. */
1529
1530 if (done)
1531 rstat = bfd_reloc_ok;
1532 else
1533 #endif /* THUMBEXTENSION */
1534 if ( h->root.type == bfd_link_hash_defined
1535 || h->root.type == bfd_link_hash_defweak)
1536 {
1537 asection *sec;
1538
1539 sec = h->root.u.def.section;
1540 val = (h->root.u.def.value
1541 + sec->output_section->vma
1542 + sec->output_offset);
1543 }
1544
1545 else if (! info->relocateable)
1546 {
1547 if (! ((*info->callbacks->undefined_symbol)
1548 (info, h->root.root.string, input_bfd, input_section,
1549 rel->r_vaddr - input_section->vma, true)))
1550 return false;
1551 }
1552 }
1553
1554 if (info->base_file)
1555 {
1556 /* Emit a reloc if the backend thinks it needs it. */
1557 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1558 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1559 }
1560
1561 #if 1 /* THUMBEXTENSION */
1562 if (done)
1563 rstat = bfd_reloc_ok;
1564 #ifndef ARM_WINCE
1565 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1566 else if (! info->relocateable
1567 && howto->type == ARM_THUMB23)
1568 {
1569 /* This is pretty much a copy of what the default
1570 _bfd_final_link_relocate and _bfd_relocate_contents
1571 routines do to perform a relocation, with special
1572 processing for the split addressing of the Thumb BL
1573 instruction. Again, it would probably be simpler adding a
1574 ThumbBRANCH23 specific macro expansion into the default
1575 code. */
1576
1577 bfd_vma address = rel->r_vaddr - input_section->vma;
1578
1579 if (address > input_section->_raw_size)
1580 rstat = bfd_reloc_outofrange;
1581 else
1582 {
1583 bfd_vma relocation = val + addend;
1584 int size = bfd_get_reloc_size (howto);
1585 boolean overflow = false;
1586 bfd_byte * location = contents + address;
1587 bfd_vma x = bfd_get_32 (input_bfd, location);
1588 bfd_vma src_mask = 0x007FFFFE;
1589 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1590 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1591 bfd_vma check;
1592 bfd_signed_vma signed_check;
1593 bfd_vma add;
1594 bfd_signed_vma signed_add;
1595
1596 BFD_ASSERT (size == 4);
1597
1598 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1599 relocation -= (input_section->output_section->vma
1600 + input_section->output_offset);
1601
1602 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1603 relocation -= address;
1604
1605 /* No need to negate the relocation with BRANCH23. */
1606 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1607 /* howto->rightshift == 1 */
1608
1609 /* Drop unwanted bits from the value we are relocating to. */
1610 check = relocation >> howto->rightshift;
1611
1612 /* If this is a signed value, the rightshift just dropped
1613 leading 1 bits (assuming twos complement). */
1614 if ((bfd_signed_vma) relocation >= 0)
1615 signed_check = check;
1616 else
1617 signed_check = (check
1618 | ((bfd_vma) - 1
1619 & ~((bfd_vma) - 1 >> howto->rightshift)));
1620
1621 /* Get the value from the object file. */
1622 if (bfd_big_endian (input_bfd))
1623 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1624 else
1625 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1626
1627 /* Get the value from the object file with an appropriate sign.
1628 The expression involving howto->src_mask isolates the upper
1629 bit of src_mask. If that bit is set in the value we are
1630 adding, it is negative, and we subtract out that number times
1631 two. If src_mask includes the highest possible bit, then we
1632 can not get the upper bit, but that does not matter since
1633 signed_add needs no adjustment to become negative in that
1634 case. */
1635 signed_add = add;
1636
1637 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1638 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1639
1640 /* howto->bitpos == 0 */
1641 /* Add the value from the object file, shifted so that it is a
1642 straight number. */
1643 signed_check += signed_add;
1644 relocation += signed_add;
1645
1646 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1647
1648 /* Assumes two's complement. */
1649 if ( signed_check > reloc_signed_max
1650 || signed_check < reloc_signed_min)
1651 overflow = true;
1652
1653 /* For the BLX(1) instruction remove bit 0 of the adjusted offset.
1654 Bit 0 can only be set if the upper insn is at a half-word boundary,
1655 since the destination address, an ARM instruction, must always be
1656 on a word boundary. The semantics of the BLX (1) instruction,
1657 however, are that bit 0 in the offset must always be 0, and the
1658 corresponding bit 1 in the target address will be set from bit
1659 1 of the source address. */
1660 if ((x & 0x18000000) == 0x08000000)
1661 relocation &= ~0x2;
1662
1663 /* Put the relocation into the correct bits. */
1664 if (bfd_big_endian (input_bfd))
1665 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1666 else
1667 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1668
1669 /* Add the relocation to the correct bits of X. */
1670 x = ((x & ~howto->dst_mask) | relocation);
1671
1672 /* Put the relocated value back in the object file. */
1673 bfd_put_32 (input_bfd, x, location);
1674
1675 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1676 }
1677 }
1678 #endif
1679 else
1680 #endif /* THUMBEXTENSION */
1681 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1682 contents,
1683 rel->r_vaddr - input_section->vma,
1684 val, addend);
1685 #if 1 /* THUMBEXTENSION */
1686 /* FIXME:
1687 Is this the best way to fix up thumb addresses? krk@cygnus.com
1688 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1689 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1690 if (! info->relocateable
1691 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1692 {
1693 /* Determine if we need to set the bottom bit of a relocated address
1694 because the address is the address of a Thumb code symbol. */
1695
1696 int patchit = false;
1697
1698 if (h != NULL
1699 && ( h->class == C_THUMBSTATFUNC
1700 || h->class == C_THUMBEXTFUNC))
1701 {
1702 patchit = true;
1703 }
1704 else if (sym != NULL
1705 && sym->n_scnum > N_UNDEF)
1706 {
1707 /* No hash entry - use the symbol instead. */
1708
1709 if ( sym->n_sclass == C_THUMBSTATFUNC
1710 || sym->n_sclass == C_THUMBEXTFUNC)
1711 patchit = true;
1712 }
1713
1714 if (patchit)
1715 {
1716 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1717 bfd_vma x = bfd_get_32 (input_bfd, location);
1718
1719 bfd_put_32 (input_bfd, x | 1, location);
1720 }
1721 }
1722 #endif /* THUMBEXTENSION */
1723
1724 switch (rstat)
1725 {
1726 default:
1727 abort ();
1728 case bfd_reloc_ok:
1729 break;
1730 case bfd_reloc_outofrange:
1731 (*_bfd_error_handler)
1732 (_("%s: bad reloc address 0x%lx in section `%s'"),
1733 bfd_get_filename (input_bfd),
1734 (unsigned long) rel->r_vaddr,
1735 bfd_get_section_name (input_bfd, input_section));
1736 return false;
1737 case bfd_reloc_overflow:
1738 {
1739 const char *name;
1740 char buf[SYMNMLEN + 1];
1741
1742 if (symndx == -1)
1743 name = "*ABS*";
1744 else if (h != NULL)
1745 name = h->root.root.string;
1746 else
1747 {
1748 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1749 if (name == NULL)
1750 return false;
1751 }
1752
1753 if (! ((*info->callbacks->reloc_overflow)
1754 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1755 input_section, rel->r_vaddr - input_section->vma)))
1756 return false;
1757 }
1758 }
1759 }
1760
1761 return true;
1762 }
1763
1764 #ifndef COFF_IMAGE_WITH_PE
1765
1766 boolean
1767 bfd_arm_allocate_interworking_sections (info)
1768 struct bfd_link_info * info;
1769 {
1770 asection * s;
1771 bfd_byte * foo;
1772 struct coff_arm_link_hash_table * globals;
1773 #if 0
1774 static char test_char = '1';
1775 #endif
1776
1777 globals = coff_arm_hash_table (info);
1778
1779 BFD_ASSERT (globals != NULL);
1780
1781 if (globals->arm_glue_size != 0)
1782 {
1783 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1784
1785 s = bfd_get_section_by_name
1786 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1787
1788 BFD_ASSERT (s != NULL);
1789
1790 foo = (bfd_byte *) bfd_alloc
1791 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1792 #if 0
1793 memset (foo, test_char, globals->arm_glue_size);
1794 #endif
1795
1796 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1797 s->contents = foo;
1798 }
1799
1800 if (globals->thumb_glue_size != 0)
1801 {
1802 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1803
1804 s = bfd_get_section_by_name
1805 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1806
1807 BFD_ASSERT (s != NULL);
1808
1809 foo = (bfd_byte *) bfd_alloc
1810 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1811 #if 0
1812 memset (foo, test_char, globals->thumb_glue_size);
1813 #endif
1814
1815 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1816 s->contents = foo;
1817 }
1818
1819 return true;
1820 }
1821
1822 static void
1823 record_arm_to_thumb_glue (info, h)
1824 struct bfd_link_info * info;
1825 struct coff_link_hash_entry * h;
1826 {
1827 const char * name = h->root.root.string;
1828 register asection * s;
1829 char * tmp_name;
1830 struct coff_link_hash_entry * myh;
1831 struct coff_arm_link_hash_table * globals;
1832
1833 globals = coff_arm_hash_table (info);
1834
1835 BFD_ASSERT (globals != NULL);
1836 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1837
1838 s = bfd_get_section_by_name
1839 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1840
1841 BFD_ASSERT (s != NULL);
1842
1843 tmp_name = ((char *)
1844 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1845
1846 BFD_ASSERT (tmp_name);
1847
1848 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1849
1850 myh = coff_link_hash_lookup
1851 (coff_hash_table (info), tmp_name, false, false, true);
1852
1853 if (myh != NULL)
1854 {
1855 free (tmp_name);
1856 return; /* we've already seen this guy */
1857 }
1858
1859 /* The only trick here is using globals->arm_glue_size as the value. Even
1860 though the section isn't allocated yet, this is where we will be putting
1861 it. */
1862
1863 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1864 BSF_GLOBAL,
1865 s, globals->arm_glue_size + 1,
1866 NULL, true, false,
1867 (struct bfd_link_hash_entry **) & myh);
1868
1869 free (tmp_name);
1870
1871 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1872
1873 return;
1874 }
1875
1876 static void
1877 record_thumb_to_arm_glue (info, h)
1878 struct bfd_link_info * info;
1879 struct coff_link_hash_entry * h;
1880 {
1881 const char * name = h->root.root.string;
1882 register asection * s;
1883 char * tmp_name;
1884 struct coff_link_hash_entry * myh;
1885 struct coff_arm_link_hash_table * globals;
1886
1887 globals = coff_arm_hash_table (info);
1888
1889 BFD_ASSERT (globals != NULL);
1890 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1891
1892 s = bfd_get_section_by_name
1893 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1894
1895 BFD_ASSERT (s != NULL);
1896
1897 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1898
1899 BFD_ASSERT (tmp_name);
1900
1901 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1902
1903 myh = coff_link_hash_lookup
1904 (coff_hash_table (info), tmp_name, false, false, true);
1905
1906 if (myh != NULL)
1907 {
1908 free (tmp_name);
1909 return; /* we've already seen this guy */
1910 }
1911
1912 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1913 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1914 NULL, true, false,
1915 (struct bfd_link_hash_entry **) & myh);
1916
1917 /* If we mark it 'thumb', the disassembler will do a better job. */
1918 myh->class = C_THUMBEXTFUNC;
1919
1920 free (tmp_name);
1921
1922 /* Allocate another symbol to mark where we switch to arm mode. */
1923
1924 #define CHANGE_TO_ARM "__%s_change_to_arm"
1925 #define BACK_FROM_ARM "__%s_back_from_arm"
1926
1927 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1928
1929 BFD_ASSERT (tmp_name);
1930
1931 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1932
1933 myh = NULL;
1934
1935 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1936 BSF_LOCAL, s, globals->thumb_glue_size
1937 + (globals->support_old_code ? 8 : 4),
1938 NULL, true, false,
1939 (struct bfd_link_hash_entry **) & myh);
1940
1941 free (tmp_name);
1942
1943 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1944
1945 return;
1946 }
1947
1948 /* Select a BFD to be used to hold the sections used by the glue code.
1949 This function is called from the linker scripts in ld/emultempl/
1950 {armcoff/pe}.em */
1951
1952 boolean
1953 bfd_arm_get_bfd_for_interworking (abfd, info)
1954 bfd * abfd;
1955 struct bfd_link_info * info;
1956 {
1957 struct coff_arm_link_hash_table * globals;
1958 flagword flags;
1959 asection * sec;
1960
1961 /* If we are only performing a partial link do not bother
1962 getting a bfd to hold the glue. */
1963 if (info->relocateable)
1964 return true;
1965
1966 globals = coff_arm_hash_table (info);
1967
1968 BFD_ASSERT (globals != NULL);
1969
1970 if (globals->bfd_of_glue_owner != NULL)
1971 return true;
1972
1973 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1974
1975 if (sec == NULL)
1976 {
1977 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1978
1979 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1980
1981 if (sec == NULL
1982 || ! bfd_set_section_flags (abfd, sec, flags)
1983 || ! bfd_set_section_alignment (abfd, sec, 2))
1984 return false;
1985 }
1986
1987 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1988
1989 if (sec == NULL)
1990 {
1991 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1992
1993 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1994
1995 if (sec == NULL
1996 || ! bfd_set_section_flags (abfd, sec, flags)
1997 || ! bfd_set_section_alignment (abfd, sec, 2))
1998 return false;
1999 }
2000
2001 /* Save the bfd for later use. */
2002 globals->bfd_of_glue_owner = abfd;
2003
2004 return true;
2005 }
2006
2007 boolean
2008 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2009 bfd * abfd;
2010 struct bfd_link_info * info;
2011 int support_old_code;
2012 {
2013 asection * sec;
2014 struct coff_arm_link_hash_table * globals;
2015
2016 /* If we are only performing a partial link do not bother
2017 to construct any glue. */
2018 if (info->relocateable)
2019 return true;
2020
2021 /* Here we have a bfd that is to be included on the link. We have a hook
2022 to do reloc rummaging, before section sizes are nailed down. */
2023
2024 _bfd_coff_get_external_symbols (abfd);
2025
2026 globals = coff_arm_hash_table (info);
2027
2028 BFD_ASSERT (globals != NULL);
2029 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2030
2031 globals->support_old_code = support_old_code;
2032
2033 /* Rummage around all the relocs and map the glue vectors. */
2034 sec = abfd->sections;
2035
2036 if (sec == NULL)
2037 return true;
2038
2039 for (; sec != NULL; sec = sec->next)
2040 {
2041 struct internal_reloc * i;
2042 struct internal_reloc * rel;
2043
2044 if (sec->reloc_count == 0)
2045 continue;
2046
2047 /* Load the relocs. */
2048 /* FIXME: there may be a storage leak here. */
2049
2050 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2051
2052 BFD_ASSERT (i != 0);
2053
2054 for (rel = i; rel < i + sec->reloc_count; ++rel)
2055 {
2056 unsigned short r_type = rel->r_type;
2057 long symndx;
2058 struct coff_link_hash_entry * h;
2059
2060 symndx = rel->r_symndx;
2061
2062 /* If the relocation is not against a symbol it cannot concern us. */
2063 if (symndx == -1)
2064 continue;
2065
2066 /* If the index is outside of the range of our table, something has gone wrong. */
2067 if (symndx >= obj_conv_table_size (abfd))
2068 {
2069 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2070 bfd_get_filename (abfd), symndx);
2071 continue;
2072 }
2073
2074 h = obj_coff_sym_hashes (abfd)[symndx];
2075
2076 /* If the relocation is against a static symbol it must be within
2077 the current section and so cannot be a cross ARM/Thumb relocation. */
2078 if (h == NULL)
2079 continue;
2080
2081 switch (r_type)
2082 {
2083 case ARM_26:
2084 /* This one is a call from arm code. We need to look up
2085 the target of the call. If it is a thumb target, we
2086 insert glue. */
2087
2088 if (h->class == C_THUMBEXTFUNC)
2089 record_arm_to_thumb_glue (info, h);
2090 break;
2091
2092 #ifndef ARM_WINCE
2093 case ARM_THUMB23:
2094 /* This one is a call from thumb code. We used to look
2095 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2096 up the target of the call. If it is an arm target, we
2097 insert glue. If the symbol does not exist it will be
2098 given a class of C_EXT and so we will generate a stub
2099 for it. This is not really a problem, since the link
2100 is doomed anyway. */
2101
2102 switch (h->class)
2103 {
2104 case C_EXT:
2105 case C_STAT:
2106 case C_LABEL:
2107 record_thumb_to_arm_glue (info, h);
2108 break;
2109 default:
2110 ;
2111 }
2112 break;
2113 #endif
2114
2115 default:
2116 break;
2117 }
2118 }
2119 }
2120
2121 return true;
2122 }
2123
2124 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2125
2126 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2127 #define coff_relocate_section coff_arm_relocate_section
2128 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2129 #define coff_adjust_symndx coff_arm_adjust_symndx
2130 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2131 #define coff_final_link_postscript coff_arm_final_link_postscript
2132 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2133 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2134 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2135 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2136 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2137
2138 /* When doing a relocateable link, we want to convert ARM26 relocs
2139 into ARM26D relocs. */
2140
2141 static boolean
2142 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2143 bfd *obfd ATTRIBUTE_UNUSED;
2144 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2145 bfd *ibfd;
2146 asection *sec;
2147 struct internal_reloc *irel;
2148 boolean *adjustedp;
2149 {
2150 if (irel->r_type == 3)
2151 {
2152 struct coff_link_hash_entry *h;
2153
2154 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2155 if (h != NULL
2156 && (h->root.type == bfd_link_hash_defined
2157 || h->root.type == bfd_link_hash_defweak)
2158 && h->root.u.def.section->output_section == sec->output_section)
2159 irel->r_type = 7;
2160 }
2161 *adjustedp = false;
2162 return true;
2163 }
2164
2165 /* Called when merging the private data areas of two BFDs.
2166 This is important as it allows us to detect if we are
2167 attempting to merge binaries compiled for different ARM
2168 targets, eg different CPUs or differents APCS's. */
2169
2170 static boolean
2171 coff_arm_merge_private_bfd_data (ibfd, obfd)
2172 bfd * ibfd;
2173 bfd * obfd;
2174 {
2175 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2176
2177 if (ibfd == obfd)
2178 return true;
2179
2180 /* If the two formats are different we cannot merge anything.
2181 This is not an error, since it is permissable to change the
2182 input and output formats. */
2183 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2184 || obfd->xvec->flavour != bfd_target_coff_flavour)
2185 return true;
2186
2187 /* Verify that the APCS is the same for the two BFDs */
2188 if (APCS_SET (ibfd))
2189 {
2190 if (APCS_SET (obfd))
2191 {
2192 /* If the src and dest have different APCS flag bits set, fail. */
2193 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2194 {
2195 _bfd_error_handler
2196 /* xgettext: c-format */
2197 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2198 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2199 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2200 );
2201
2202 bfd_set_error (bfd_error_wrong_format);
2203 return false;
2204 }
2205
2206 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2207 {
2208 const char *msg;
2209
2210 if (APCS_FLOAT_FLAG (ibfd))
2211 /* xgettext: c-format */
2212 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2213 else
2214 /* xgettext: c-format */
2215 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2216
2217 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2218 bfd_get_filename (obfd));
2219
2220 bfd_set_error (bfd_error_wrong_format);
2221 return false;
2222 }
2223
2224 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2225 {
2226 const char * msg;
2227
2228 if (PIC_FLAG (ibfd))
2229 /* xgettext: c-format */
2230 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2231 else
2232 /* xgettext: c-format */
2233 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2234 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2235 bfd_get_filename (obfd));
2236
2237 bfd_set_error (bfd_error_wrong_format);
2238 return false;
2239 }
2240 }
2241 else
2242 {
2243 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2244
2245 /* Set up the arch and fields as well as these are probably wrong. */
2246 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2247 }
2248 }
2249
2250 /* Check the interworking support. */
2251 if (INTERWORK_SET (ibfd))
2252 {
2253 if (INTERWORK_SET (obfd))
2254 {
2255 /* If the src and dest differ in their interworking issue a warning. */
2256 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2257 {
2258 const char * msg;
2259
2260 if (INTERWORK_FLAG (ibfd))
2261 /* xgettext: c-format */
2262 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2263 else
2264 /* xgettext: c-format */
2265 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2266
2267 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2268 bfd_get_filename (obfd));
2269 }
2270 }
2271 else
2272 {
2273 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2274 }
2275 }
2276
2277 return true;
2278 }
2279
2280 /* Display the flags field. */
2281
2282 static boolean
2283 coff_arm_print_private_bfd_data (abfd, ptr)
2284 bfd * abfd;
2285 PTR ptr;
2286 {
2287 FILE * file = (FILE *) ptr;
2288
2289 BFD_ASSERT (abfd != NULL && ptr != NULL);
2290
2291 /* xgettext:c-format */
2292 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2293
2294 if (APCS_SET (abfd))
2295 {
2296 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2297 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2298
2299 if (APCS_FLOAT_FLAG (abfd))
2300 fprintf (file, _(" [floats passed in float registers]"));
2301 else
2302 fprintf (file, _(" [floats passed in integer registers]"));
2303
2304 if (PIC_FLAG (abfd))
2305 fprintf (file, _(" [position independent]"));
2306 else
2307 fprintf (file, _(" [absolute position]"));
2308 }
2309
2310 if (! INTERWORK_SET (abfd))
2311 fprintf (file, _(" [interworking flag not initialised]"));
2312 else if (INTERWORK_FLAG (abfd))
2313 fprintf (file, _(" [interworking supported]"));
2314 else
2315 fprintf (file, _(" [interworking not supported]"));
2316
2317 fputc ('\n', file);
2318
2319 return true;
2320 }
2321
2322 /* Copies the given flags into the coff_tdata.flags field.
2323 Typically these flags come from the f_flags[] field of
2324 the COFF filehdr structure, which contains important,
2325 target specific information.
2326 Note: Although this function is static, it is explicitly
2327 called from both coffcode.h and peicode.h. */
2328
2329 static boolean
2330 _bfd_coff_arm_set_private_flags (abfd, flags)
2331 bfd * abfd;
2332 flagword flags;
2333 {
2334 flagword flag;
2335
2336 BFD_ASSERT (abfd != NULL);
2337
2338 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2339
2340 /* Make sure that the APCS field has not been initialised to the opposite
2341 value. */
2342 if (APCS_SET (abfd)
2343 && ( (APCS_26_FLAG (abfd) != flag)
2344 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2345 || (PIC_FLAG (abfd) != (flags & F_PIC))
2346 ))
2347 return false;
2348
2349 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2350
2351 SET_APCS_FLAGS (abfd, flag);
2352
2353 flag = (flags & F_INTERWORK);
2354
2355 /* If the BFD has already had its interworking flag set, but it
2356 is different from the value that we have been asked to set,
2357 then assume that that merged code will not support interworking
2358 and set the flag accordingly. */
2359 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2360 {
2361 if (flag)
2362 /* xgettext: c-format */
2363 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2364 bfd_get_filename (abfd));
2365 else
2366 /* xgettext: c-format */
2367 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2368 bfd_get_filename (abfd));
2369 flag = 0;
2370 }
2371
2372 SET_INTERWORK_FLAG (abfd, flag);
2373
2374 return true;
2375 }
2376
2377 /* Copy the important parts of the target specific data
2378 from one instance of a BFD to another. */
2379
2380 static boolean
2381 coff_arm_copy_private_bfd_data (src, dest)
2382 bfd * src;
2383 bfd * dest;
2384 {
2385 BFD_ASSERT (src != NULL && dest != NULL);
2386
2387 if (src == dest)
2388 return true;
2389
2390 /* If the destination is not in the same format as the source, do not do
2391 the copy. */
2392 if (src->xvec != dest->xvec)
2393 return true;
2394
2395 /* copy the flags field */
2396 if (APCS_SET (src))
2397 {
2398 if (APCS_SET (dest))
2399 {
2400 /* If the src and dest have different APCS flag bits set, fail. */
2401 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2402 return false;
2403
2404 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2405 return false;
2406
2407 if (PIC_FLAG (dest) != PIC_FLAG (src))
2408 return false;
2409 }
2410 else
2411 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2412 | PIC_FLAG (src));
2413 }
2414
2415 if (INTERWORK_SET (src))
2416 {
2417 if (INTERWORK_SET (dest))
2418 {
2419 /* If the src and dest have different interworking flags then turn
2420 off the interworking bit. */
2421 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2422 {
2423 if (INTERWORK_FLAG (dest))
2424 {
2425 /* xgettext:c-format */
2426 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2427 bfd_get_filename (dest),
2428 bfd_get_filename (src));
2429 }
2430
2431 SET_INTERWORK_FLAG (dest, 0);
2432 }
2433 }
2434 else
2435 {
2436 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2437 }
2438 }
2439
2440 return true;
2441 }
2442
2443 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2444 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2445 #define LOCAL_LABEL_PREFIX ""
2446 #ifndef USER_LABEL_PREFIX
2447 #define USER_LABEL_PREFIX "_"
2448 #endif
2449
2450 /* Like _bfd_coff_is_local_label_name, but
2451 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2452 non-local.
2453 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2454 labels of the form Lxxx to be stripped. */
2455 static boolean
2456 coff_arm_is_local_label_name (abfd, name)
2457 bfd * abfd ATTRIBUTE_UNUSED;
2458 const char * name;
2459 {
2460 #ifdef USER_LABEL_PREFIX
2461 if (USER_LABEL_PREFIX[0] != 0)
2462 {
2463 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2464 return false;
2465 }
2466 #endif
2467
2468 #ifdef LOCAL_LABEL_PREFIX
2469 /* If there is a prefix for local labels then look for this.
2470 If the prefix exists, but it is empty, then ignore the test. */
2471
2472 if (LOCAL_LABEL_PREFIX[0] != 0)
2473 {
2474 int len = strlen (LOCAL_LABEL_PREFIX);
2475
2476 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2477 return false;
2478
2479 /* Perform the checks below for the rest of the name. */
2480 name += len;
2481 }
2482 #endif
2483
2484 return name[0] == 'L';
2485 }
2486
2487 /* This piece of machinery exists only to guarantee that the bfd that holds
2488 the glue section is written last.
2489
2490 This does depend on bfd_make_section attaching a new section to the
2491 end of the section list for the bfd.
2492
2493 krk@cygnus.com */
2494
2495 static boolean
2496 coff_arm_link_output_has_begun (sub, info)
2497 bfd * sub;
2498 struct coff_final_link_info * info;
2499 {
2500 return (sub->output_has_begun
2501 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2502 }
2503
2504 static boolean
2505 coff_arm_final_link_postscript (abfd, pfinfo)
2506 bfd * abfd ATTRIBUTE_UNUSED;
2507 struct coff_final_link_info * pfinfo;
2508 {
2509 struct coff_arm_link_hash_table * globals;
2510
2511 globals = coff_arm_hash_table (pfinfo->info);
2512
2513 BFD_ASSERT (globals != NULL);
2514
2515 if (globals->bfd_of_glue_owner != NULL)
2516 {
2517 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2518 return false;
2519
2520 globals->bfd_of_glue_owner->output_has_begun = true;
2521 }
2522
2523 return true;
2524 }
2525
2526 #include "coffcode.h"
2527
2528 #ifndef TARGET_LITTLE_SYM
2529 #define TARGET_LITTLE_SYM armcoff_little_vec
2530 #endif
2531 #ifndef TARGET_LITTLE_NAME
2532 #define TARGET_LITTLE_NAME "coff-arm-little"
2533 #endif
2534 #ifndef TARGET_BIG_SYM
2535 #define TARGET_BIG_SYM armcoff_big_vec
2536 #endif
2537 #ifndef TARGET_BIG_NAME
2538 #define TARGET_BIG_NAME "coff-arm-big"
2539 #endif
2540
2541 #ifndef TARGET_UNDERSCORE
2542 #define TARGET_UNDERSCORE 0
2543 #endif
2544
2545 #ifndef EXTRA_S_FLAGS
2546 #ifdef COFF_WITH_PE
2547 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2548 #else
2549 #define EXTRA_S_FLAGS 0
2550 #endif
2551 #endif
2552
2553 /* Forward declaration for use initialising alternative_target field. */
2554 extern const bfd_target TARGET_BIG_SYM ;
2555
2556 /* Target vectors. */
2557 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2558 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)
GDB Binutils - Deliverables
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