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[deliverable/binutils-gdb.git] / bfd / coff-arm.c
1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 98, 99, 2000
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 #ifndef NUM_ELEM
52 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
53 #endif
54
55 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
56 /* some typedefs for holding instructions */
57 typedef unsigned long int insn32;
58 typedef unsigned short int insn16;
59
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
822 static CONST struct reloc_howto_struct *
823 coff_arm_reloc_type_lookup (abfd, code)
824 bfd * abfd;
825 bfd_reloc_code_real_type code;
826 {
827 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
828
829 if (code == BFD_RELOC_CTOR)
830 switch (bfd_get_arch_info (abfd)->bits_per_address)
831 {
832 case 32:
833 code = BFD_RELOC_32;
834 break;
835 default: return (CONST struct reloc_howto_struct *) 0;
836 }
837
838 switch (code)
839 {
840 #ifdef ARM_WINCE
841 ASTD (BFD_RELOC_32, ARM_32);
842 ASTD (BFD_RELOC_RVA, ARM_RVA32);
843 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
844 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
845 #else
846 ASTD (BFD_RELOC_8, ARM_8);
847 ASTD (BFD_RELOC_16, ARM_16);
848 ASTD (BFD_RELOC_32, ARM_32);
849 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
850 ASTD (BFD_RELOC_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 #endif
858 default: return (CONST struct reloc_howto_struct *) 0;
859 }
860 }
861
862 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
863 #define COFF_PAGE_SIZE 0x1000
864 /* Turn a howto into a reloc nunmber */
865
866 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
867 #define BADMAG(x) ARMBADMAG(x)
868 #define ARM 1 /* Customize coffcode.h */
869
870 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
871 This allows us to store global data here without actually creating any
872 global variables, which is a no-no in the BFD world. */
873 struct coff_arm_link_hash_table
874 {
875 /* The original coff_link_hash_table structure. MUST be first field. */
876 struct coff_link_hash_table root;
877
878 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
879 long int thumb_glue_size;
880
881 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
882 long int arm_glue_size;
883
884 /* An arbitary input BFD chosen to hold the glue sections. */
885 bfd * bfd_of_glue_owner;
886
887 /* Support interworking with old, non-interworking aware ARM code. */
888 int support_old_code;
889 };
890
891 /* Get the ARM coff linker hash table from a link_info structure. */
892 #define coff_arm_hash_table(info) \
893 ((struct coff_arm_link_hash_table *) ((info)->hash))
894
895 /* Create an ARM coff linker hash table. */
896
897 static struct bfd_link_hash_table *
898 coff_arm_link_hash_table_create (abfd)
899 bfd * abfd;
900 {
901 struct coff_arm_link_hash_table * ret;
902
903 ret = ((struct coff_arm_link_hash_table *)
904 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
905 if (ret == (struct coff_arm_link_hash_table *) NULL)
906 return NULL;
907
908 if (! _bfd_coff_link_hash_table_init
909 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
910 {
911 bfd_release (abfd, ret);
912 return (struct bfd_link_hash_table *) NULL;
913 }
914
915 ret->thumb_glue_size = 0;
916 ret->arm_glue_size = 0;
917 ret->bfd_of_glue_owner = NULL;
918
919 return & ret->root.root;
920 }
921
922 static void
923 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
924 struct bfd_link_info *info;
925 bfd *output_bfd;
926 asection *input_section;
927 bfd_vma reloc_offset;
928 {
929 bfd_vma addr = reloc_offset
930 - input_section->vma
931 + input_section->output_offset
932 + input_section->output_section->vma;
933
934 if (coff_data(output_bfd)->pe)
935 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
936 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
937
938 }
939 \f
940 /* The thumb form of a long branch is a bit finicky, because the offset
941 encoding is split over two fields, each in it's own instruction. They
942 can occur in any order. So given a thumb form of long branch, and an
943 offset, insert the offset into the thumb branch and return finished
944 instruction.
945
946 It takes two thumb instructions to encode the target address. Each has
947 11 bits to invest. The upper 11 bits are stored in one (identifed by
948 H-0.. see below), the lower 11 bits are stored in the other (identified
949 by H-1).
950
951 Combine together and shifted left by 1 (it's a half word address) and
952 there you have it.
953
954 Op: 1111 = F,
955 H-0, upper address-0 = 000
956 Op: 1111 = F,
957 H-1, lower address-0 = 800
958
959 They can be ordered either way, but the arm tools I've seen always put
960 the lower one first. It probably doesn't matter. krk@cygnus.com
961
962 XXX: Actually the order does matter. The second instruction (H-1)
963 moves the computed address into the PC, so it must be the second one
964 in the sequence. The problem, however is that whilst little endian code
965 stores the instructions in HI then LOW order, big endian code does the
966 reverse. nickc@cygnus.com */
967
968 #define LOW_HI_ORDER 0xF800F000
969 #define HI_LOW_ORDER 0xF000F800
970
971 static insn32
972 insert_thumb_branch (br_insn, rel_off)
973 insn32 br_insn;
974 int rel_off;
975 {
976 unsigned int low_bits;
977 unsigned int high_bits;
978
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
998 \f
999 static struct coff_link_hash_entry *
1000 find_thumb_glue (info, name, input_bfd)
1001 struct bfd_link_info * info;
1002 CONST char * name;
1003 bfd * input_bfd;
1004 {
1005 char * tmp_name;
1006 struct coff_link_hash_entry * myh;
1007
1008 tmp_name = ((char *)
1009 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1010
1011 BFD_ASSERT (tmp_name);
1012
1013 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1014
1015 myh = coff_link_hash_lookup
1016 (coff_hash_table (info), tmp_name, false, false, true);
1017
1018 if (myh == NULL)
1019 /* xgettext:c-format */
1020 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1021 bfd_get_filename (input_bfd), tmp_name, name);
1022
1023 free (tmp_name);
1024
1025 return myh;
1026 }
1027
1028 static struct coff_link_hash_entry *
1029 find_arm_glue (info, name, input_bfd)
1030 struct bfd_link_info * info;
1031 CONST char * name;
1032 bfd * input_bfd;
1033 {
1034 char * tmp_name;
1035 struct coff_link_hash_entry * myh;
1036
1037 tmp_name = ((char *)
1038 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1039
1040 BFD_ASSERT (tmp_name);
1041
1042 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1043
1044 myh = coff_link_hash_lookup
1045 (coff_hash_table (info), tmp_name, false, false, true);
1046
1047 if (myh == NULL)
1048 /* xgettext:c-format */
1049 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1050 bfd_get_filename (input_bfd), tmp_name, name);
1051
1052 free (tmp_name);
1053
1054 return myh;
1055 }
1056
1057 /*
1058 ARM->Thumb glue:
1059
1060 .arm
1061 __func_from_arm:
1062 ldr r12, __func_addr
1063 bx r12
1064 __func_addr:
1065 .word func @ behave as if you saw a ARM_32 reloc
1066 */
1067
1068 #define ARM2THUMB_GLUE_SIZE 12
1069 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1070 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1071 static const insn32 a2t3_func_addr_insn = 0x00000001;
1072
1073 /*
1074 Thumb->ARM: Thumb->(non-interworking aware) ARM
1075
1076 .thumb .thumb
1077 .align 2 .align 2
1078 __func_from_thumb: __func_from_thumb:
1079 bx pc push {r6, lr}
1080 nop ldr r6, __func_addr
1081 .arm mov lr, pc
1082 __func_change_to_arm: bx r6
1083 b func .arm
1084 __func_back_to_thumb:
1085 ldmia r13! {r6, lr}
1086 bx lr
1087 __func_addr:
1088 .word func
1089 */
1090
1091 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1092 static const insn16 t2a1_bx_pc_insn = 0x4778;
1093 static const insn16 t2a2_noop_insn = 0x46c0;
1094 static const insn32 t2a3_b_insn = 0xea000000;
1095
1096 static const insn16 t2a1_push_insn = 0xb540;
1097 static const insn16 t2a2_ldr_insn = 0x4e03;
1098 static const insn16 t2a3_mov_insn = 0x46fe;
1099 static const insn16 t2a4_bx_insn = 0x4730;
1100 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1101 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1102
1103 /* TODO:
1104 We should really create new local (static) symbols in destination
1105 object for each stub we create. We should also create local
1106 (static) symbols within the stubs when switching between ARM and
1107 Thumb code. This will ensure that the debugger and disassembler
1108 can present a better view of stubs.
1109
1110 We can treat stubs like literal sections, and for the THUMB9 ones
1111 (short addressing range) we should be able to insert the stubs
1112 between sections. i.e. the simplest approach (since relocations
1113 are done on a section basis) is to dump the stubs at the end of
1114 processing a section. That way we can always try and minimise the
1115 offset to and from a stub. However, this does not map well onto
1116 the way that the linker/BFD does its work: mapping all input
1117 sections to output sections via the linker script before doing
1118 all the processing.
1119
1120 Unfortunately it may be easier to just to disallow short range
1121 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1122 only branch-and-link (BL) calls. This will simplify the processing
1123 since we can then put all of the stubs into their own section.
1124
1125 TODO:
1126 On a different subject, rather than complaining when a
1127 branch cannot fit in the number of bits available for the
1128 instruction we should generate a trampoline stub (needed to
1129 address the complete 32bit address space). */
1130
1131 /* The standard COFF backend linker does not cope with the special
1132 Thumb BRANCH23 relocation. The alternative would be to split the
1133 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1134 bit simpler simply providing our own relocation driver. */
1135
1136 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1137 This code is a very slightly modified copy of
1138 _bfd_coff_generic_relocate_section. It would be a much more
1139 maintainable solution to have a MACRO that could be expanded within
1140 _bfd_coff_generic_relocate_section that would only be provided for
1141 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1142 is different from the original. */
1143
1144 static boolean
1145 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1146 contents, relocs, syms, sections)
1147 bfd *output_bfd;
1148 struct bfd_link_info *info;
1149 bfd *input_bfd;
1150 asection *input_section;
1151 bfd_byte *contents;
1152 struct internal_reloc *relocs;
1153 struct internal_syment *syms;
1154 asection **sections;
1155 {
1156 struct internal_reloc * rel;
1157 struct internal_reloc * relend;
1158
1159 rel = relocs;
1160 relend = rel + input_section->reloc_count;
1161
1162 for (; rel < relend; rel++)
1163 {
1164 int done = 0;
1165 long symndx;
1166 struct coff_link_hash_entry * h;
1167 struct internal_syment * sym;
1168 bfd_vma addend;
1169 bfd_vma val;
1170 reloc_howto_type * howto;
1171 bfd_reloc_status_type rstat;
1172 bfd_vma h_val;
1173
1174 symndx = rel->r_symndx;
1175
1176 if (symndx == -1)
1177 {
1178 h = NULL;
1179 sym = NULL;
1180 }
1181 else
1182 {
1183 h = obj_coff_sym_hashes (input_bfd)[symndx];
1184 sym = syms + symndx;
1185 }
1186
1187 /* COFF treats common symbols in one of two ways. Either the
1188 size of the symbol is included in the section contents, or it
1189 is not. We assume that the size is not included, and force
1190 the rtype_to_howto function to adjust the addend as needed. */
1191
1192 if (sym != NULL && sym->n_scnum != 0)
1193 addend = - sym->n_value;
1194 else
1195 addend = 0;
1196
1197
1198 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1199 sym, &addend);
1200 if (howto == NULL)
1201 return false;
1202
1203 /* The relocation_section function will skip pcrel_offset relocs
1204 when doing a relocateable link. However, we want to convert
1205 ARM26 to ARM26D relocs if possible. We return a fake howto in
1206 this case without pcrel_offset set, and adjust the addend to
1207 compensate. */
1208 if (rel->r_type == ARM_26
1209 && h != NULL
1210 && info->relocateable
1211 && (h->root.type == bfd_link_hash_defined
1212 || h->root.type == bfd_link_hash_defweak)
1213 && h->root.u.def.section->output_section == input_section->output_section)
1214 {
1215 static reloc_howto_type fake_arm26_reloc =
1216 HOWTO (ARM_26,
1217 2,
1218 2,
1219 24,
1220 true,
1221 0,
1222 complain_overflow_signed,
1223 aoutarm_fix_pcrel_26 ,
1224 "ARM_26",
1225 false,
1226 0x00ffffff,
1227 0x00ffffff,
1228 false);
1229
1230 addend -= rel->r_vaddr - input_section->vma;
1231 howto = &fake_arm26_reloc;
1232 }
1233
1234 #ifdef ARM_WINCE
1235 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1236 the next opcode's pc, so is off by one. */
1237 if (howto->pc_relative && !info->relocateable)
1238 addend -= 8;
1239 #endif
1240
1241 /* If we are doing a relocateable link, then we can just ignore
1242 a PC relative reloc that is pcrel_offset. It will already
1243 have the correct value. If this is not a relocateable link,
1244 then we should ignore the symbol value. */
1245 if (howto->pc_relative && howto->pcrel_offset)
1246 {
1247 if (info->relocateable)
1248 continue;
1249 #if 0 /* We must not ignore the symbol value. If the symbol is
1250 within the same section, the relocation should have already
1251 been fixed, but if it is not, we'll be handed a reloc into
1252 the beginning of the symbol's section, so we must not cancel
1253 out the symbol's value, otherwise we'll be adding it in
1254 twice. */
1255 if (sym != NULL && sym->n_scnum != 0)
1256 addend += sym->n_value;
1257 #endif
1258 }
1259
1260 val = 0;
1261
1262 if (h == NULL)
1263 {
1264 asection *sec;
1265
1266 if (symndx == -1)
1267 {
1268 sec = bfd_abs_section_ptr;
1269 val = 0;
1270 }
1271 else
1272 {
1273 sec = sections[symndx];
1274 val = (sec->output_section->vma
1275 + sec->output_offset
1276 + sym->n_value
1277 - sec->vma);
1278 }
1279 }
1280 else
1281 {
1282 #if 1 /* THUMBEXTENSION */
1283 /* We don't output the stubs if we are generating a
1284 relocatable output file, since we may as well leave the
1285 stub generation to the final linker pass. If we fail to
1286 verify that the name is defined, we'll try to build stubs
1287 for an undefined name... */
1288 if (! info->relocateable
1289 && ( h->root.type == bfd_link_hash_defined
1290 || h->root.type == bfd_link_hash_defweak))
1291 {
1292 asection * h_sec = h->root.u.def.section;
1293 const char * name = h->root.root.string;
1294
1295 /* h locates the symbol referenced in the reloc. */
1296 h_val = (h->root.u.def.value
1297 + h_sec->output_section->vma
1298 + h_sec->output_offset);
1299
1300 if (howto->type == ARM_26)
1301 {
1302 if ( h->class == C_THUMBSTATFUNC
1303 || h->class == C_THUMBEXTFUNC)
1304 {
1305 /* Arm code calling a Thumb function */
1306 unsigned long int tmp;
1307 long int my_offset;
1308 asection * s;
1309 long int ret_offset;
1310 struct coff_link_hash_entry * myh;
1311 struct coff_arm_link_hash_table * globals;
1312
1313 myh = find_arm_glue (info, name, input_bfd);
1314 if (myh == NULL)
1315 return false;
1316
1317 globals = coff_arm_hash_table (info);
1318
1319 BFD_ASSERT (globals != NULL);
1320 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1321
1322 my_offset = myh->root.u.def.value;
1323
1324 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1325 ARM2THUMB_GLUE_SECTION_NAME);
1326 BFD_ASSERT (s != NULL);
1327 BFD_ASSERT (s->contents != NULL);
1328 BFD_ASSERT (s->output_section != NULL);
1329
1330 if ((my_offset & 0x01) == 0x01)
1331 {
1332 if (h_sec->owner != NULL
1333 && INTERWORK_SET (h_sec->owner)
1334 && ! INTERWORK_FLAG (h_sec->owner))
1335 {
1336 _bfd_error_handler
1337 /* xgettext:c-format */
1338 (_("%s(%s): warning: interworking not enabled."),
1339 bfd_get_filename (h_sec->owner), name);
1340 _bfd_error_handler
1341 /* xgettext:c-format */
1342 (_(" first occurrence: %s: arm call to thumb"),
1343 bfd_get_filename (input_bfd));
1344 }
1345
1346 --my_offset;
1347 myh->root.u.def.value = my_offset;
1348
1349 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1350 s->contents + my_offset);
1351
1352 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1353 s->contents + my_offset + 4);
1354
1355 /* It's a thumb address. Add the low order bit. */
1356 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1357 s->contents + my_offset + 8);
1358
1359 if (info->base_file)
1360 arm_emit_base_file_entry (info, output_bfd, s,
1361 my_offset + 8);
1362
1363 }
1364
1365 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1366
1367 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1368 - input_section->vma);
1369
1370 tmp = tmp & 0xFF000000;
1371
1372 /* Somehow these are both 4 too far, so subtract 8. */
1373 ret_offset =
1374 s->output_offset
1375 + my_offset
1376 + s->output_section->vma
1377 - (input_section->output_offset
1378 + input_section->output_section->vma
1379 + rel->r_vaddr)
1380 - 8;
1381
1382 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1383
1384 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1385 - input_section->vma);
1386 done = 1;
1387 }
1388 }
1389
1390 #ifndef ARM_WINCE
1391 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1392 else if (howto->type == ARM_THUMB23)
1393 {
1394 if ( h->class == C_EXT
1395 || h->class == C_STAT
1396 || h->class == C_LABEL)
1397 {
1398 /* Thumb code calling an ARM function */
1399 asection * s = 0;
1400 long int my_offset;
1401 unsigned long int tmp;
1402 long int ret_offset;
1403 struct coff_link_hash_entry * myh;
1404 struct coff_arm_link_hash_table * globals;
1405
1406 myh = find_thumb_glue (info, name, input_bfd);
1407 if (myh == NULL)
1408 return false;
1409
1410 globals = coff_arm_hash_table (info);
1411
1412 BFD_ASSERT (globals != NULL);
1413 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1414
1415 my_offset = myh->root.u.def.value;
1416
1417 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1418 THUMB2ARM_GLUE_SECTION_NAME);
1419
1420 BFD_ASSERT (s != NULL);
1421 BFD_ASSERT (s->contents != NULL);
1422 BFD_ASSERT (s->output_section != NULL);
1423
1424 if ((my_offset & 0x01) == 0x01)
1425 {
1426 if (h_sec->owner != NULL
1427 && INTERWORK_SET (h_sec->owner)
1428 && ! INTERWORK_FLAG (h_sec->owner)
1429 && ! globals->support_old_code)
1430 {
1431 _bfd_error_handler
1432 /* xgettext:c-format */
1433 (_("%s(%s): warning: interworking not enabled."),
1434 bfd_get_filename (h_sec->owner), name);
1435 _bfd_error_handler
1436 /* xgettext:c-format */
1437 (_(" first occurrence: %s: thumb call to arm"),
1438 bfd_get_filename (input_bfd));
1439 _bfd_error_handler
1440 (_(" consider relinking with --support-old-code enabled"));
1441 }
1442
1443 -- my_offset;
1444 myh->root.u.def.value = my_offset;
1445
1446 if (globals->support_old_code)
1447 {
1448 bfd_put_16 (output_bfd, t2a1_push_insn,
1449 s->contents + my_offset);
1450
1451 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1452 s->contents + my_offset + 2);
1453
1454 bfd_put_16 (output_bfd, t2a3_mov_insn,
1455 s->contents + my_offset + 4);
1456
1457 bfd_put_16 (output_bfd, t2a4_bx_insn,
1458 s->contents + my_offset + 6);
1459
1460 bfd_put_32 (output_bfd, t2a5_pop_insn,
1461 s->contents + my_offset + 8);
1462
1463 bfd_put_32 (output_bfd, t2a6_bx_insn,
1464 s->contents + my_offset + 12);
1465
1466 /* Store the address of the function in the last word of the stub. */
1467 bfd_put_32 (output_bfd, h_val,
1468 s->contents + my_offset + 16);
1469
1470 if (info->base_file)
1471 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1472 }
1473 else
1474 {
1475 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1476 s->contents + my_offset);
1477
1478 bfd_put_16 (output_bfd, t2a2_noop_insn,
1479 s->contents + my_offset + 2);
1480
1481 ret_offset =
1482 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1483 - ((bfd_signed_vma)
1484 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1485 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1486 + s->output_section->vma) /* Address of the start of the current section. */
1487 + 4 /* The branch instruction is 4 bytes into the stub. */
1488 + 8); /* ARM branches work from the pc of the instruction + 8. */
1489
1490 bfd_put_32 (output_bfd,
1491 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1492 s->contents + my_offset + 4);
1493
1494 }
1495 }
1496
1497 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1498
1499 /* Now go back and fix up the original BL insn to point
1500 to here. */
1501 ret_offset =
1502 s->output_offset
1503 + my_offset
1504 - (input_section->output_offset
1505 + rel->r_vaddr)
1506 -4;
1507
1508 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1509 - input_section->vma);
1510
1511 bfd_put_32 (output_bfd,
1512 insert_thumb_branch (tmp, ret_offset),
1513 contents + rel->r_vaddr
1514 - input_section->vma);
1515
1516 done = 1;
1517 }
1518 }
1519 #endif
1520 }
1521
1522 /* If the relocation type and destination symbol does not
1523 fall into one of the above categories, then we can just
1524 perform a direct link. */
1525
1526 if (done)
1527 rstat = bfd_reloc_ok;
1528 else
1529 #endif /* THUMBEXTENSION */
1530 if ( h->root.type == bfd_link_hash_defined
1531 || h->root.type == bfd_link_hash_defweak)
1532 {
1533 asection *sec;
1534
1535 sec = h->root.u.def.section;
1536 val = (h->root.u.def.value
1537 + sec->output_section->vma
1538 + sec->output_offset);
1539 }
1540
1541 else if (! info->relocateable)
1542 {
1543 if (! ((*info->callbacks->undefined_symbol)
1544 (info, h->root.root.string, input_bfd, input_section,
1545 rel->r_vaddr - input_section->vma, true)))
1546 return false;
1547 }
1548 }
1549
1550 if (info->base_file)
1551 {
1552 /* Emit a reloc if the backend thinks it needs it. */
1553 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1554 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1555 }
1556
1557 #if 1 /* THUMBEXTENSION */
1558 if (done)
1559 rstat = bfd_reloc_ok;
1560 #ifndef ARM_WINCE
1561 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1562 else if (! info->relocateable
1563 && howto->type == ARM_THUMB23)
1564 {
1565 /* This is pretty much a copy of what the default
1566 _bfd_final_link_relocate and _bfd_relocate_contents
1567 routines do to perform a relocation, with special
1568 processing for the split addressing of the Thumb BL
1569 instruction. Again, it would probably be simpler adding a
1570 ThumbBRANCH23 specific macro expansion into the default
1571 code. */
1572
1573 bfd_vma address = rel->r_vaddr - input_section->vma;
1574
1575 if (address > input_section->_raw_size)
1576 rstat = bfd_reloc_outofrange;
1577 else
1578 {
1579 bfd_vma relocation = val + addend;
1580 int size = bfd_get_reloc_size (howto);
1581 boolean overflow = false;
1582 bfd_byte * location = contents + address;
1583 bfd_vma x = bfd_get_32 (input_bfd, location);
1584 bfd_vma src_mask = 0x007FFFFE;
1585 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1586 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1587 bfd_vma check;
1588 bfd_signed_vma signed_check;
1589 bfd_vma add;
1590 bfd_signed_vma signed_add;
1591
1592 BFD_ASSERT (size == 4);
1593
1594 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1595 relocation -= (input_section->output_section->vma
1596 + input_section->output_offset);
1597
1598 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1599 relocation -= address;
1600
1601 /* No need to negate the relocation with BRANCH23. */
1602 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1603 /* howto->rightshift == 1 */
1604 /* Drop unwanted bits from the value we are relocating to. */
1605
1606 check = relocation >> howto->rightshift;
1607
1608 /* If this is a signed value, the rightshift just dropped
1609 leading 1 bits (assuming twos complement). */
1610 if ((bfd_signed_vma) relocation >= 0)
1611 signed_check = check;
1612 else
1613 signed_check = (check
1614 | ((bfd_vma) - 1
1615 & ~((bfd_vma) - 1 >> howto->rightshift)));
1616
1617 /* Get the value from the object file. */
1618 if (bfd_big_endian (input_bfd))
1619 {
1620 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1621 }
1622 else
1623 {
1624 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1625 }
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
1636 signed_add = add;
1637
1638 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1639 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1640
1641 /* Add the value from the object file, shifted so that it is a
1642 straight number. */
1643 /* howto->bitpos == 0 */
1644
1645 signed_check += signed_add;
1646 relocation += signed_add;
1647
1648 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1649
1650 /* Assumes two's complement. */
1651 if ( signed_check > reloc_signed_max
1652 || signed_check < reloc_signed_min)
1653 overflow = true;
1654
1655 /* Put RELOCATION into the correct bits: */
1656
1657 if (bfd_big_endian (input_bfd))
1658 {
1659 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1660 }
1661 else
1662 {
1663 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1664 }
1665
1666 /* Add RELOCATION to the correct bits of X: */
1667 x = ((x & ~howto->dst_mask) | relocation);
1668
1669 /* Put the relocated value back in the object file: */
1670 bfd_put_32 (input_bfd, x, location);
1671
1672 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1673 }
1674 }
1675 #endif
1676 else
1677 #endif /* THUMBEXTENSION */
1678 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1679 contents,
1680 rel->r_vaddr - input_section->vma,
1681 val, addend);
1682 #if 1 /* THUMBEXTENSION */
1683 /* FIXME:
1684 Is this the best way to fix up thumb addresses? krk@cygnus.com
1685 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1686 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1687 if (! info->relocateable
1688 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1689 {
1690 /* Determine if we need to set the bottom bit of a relocated address
1691 because the address is the address of a Thumb code symbol. */
1692
1693 int patchit = false;
1694
1695 if (h != NULL
1696 && ( h->class == C_THUMBSTATFUNC
1697 || h->class == C_THUMBEXTFUNC))
1698 {
1699 patchit = true;
1700 }
1701 else if (sym != NULL
1702 && sym->n_scnum > N_UNDEF)
1703 {
1704 /* No hash entry - use the symbol instead. */
1705
1706 if ( sym->n_sclass == C_THUMBSTATFUNC
1707 || sym->n_sclass == C_THUMBEXTFUNC)
1708 patchit = true;
1709 }
1710
1711 if (patchit)
1712 {
1713 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1714 bfd_vma x = bfd_get_32 (input_bfd, location);
1715
1716 bfd_put_32 (input_bfd, x | 1, location);
1717 }
1718 }
1719 #endif /* THUMBEXTENSION */
1720
1721 switch (rstat)
1722 {
1723 default:
1724 abort ();
1725 case bfd_reloc_ok:
1726 break;
1727 case bfd_reloc_outofrange:
1728 (*_bfd_error_handler)
1729 (_("%s: bad reloc address 0x%lx in section `%s'"),
1730 bfd_get_filename (input_bfd),
1731 (unsigned long) rel->r_vaddr,
1732 bfd_get_section_name (input_bfd, input_section));
1733 return false;
1734 case bfd_reloc_overflow:
1735 {
1736 const char *name;
1737 char buf[SYMNMLEN + 1];
1738
1739 if (symndx == -1)
1740 name = "*ABS*";
1741 else if (h != NULL)
1742 name = h->root.root.string;
1743 else
1744 {
1745 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1746 if (name == NULL)
1747 return false;
1748 }
1749
1750 if (! ((*info->callbacks->reloc_overflow)
1751 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1752 input_section, rel->r_vaddr - input_section->vma)))
1753 return false;
1754 }
1755 }
1756 }
1757
1758 return true;
1759 }
1760
1761 #ifndef COFF_IMAGE_WITH_PE
1762
1763 boolean
1764 bfd_arm_allocate_interworking_sections (info)
1765 struct bfd_link_info * info;
1766 {
1767 asection * s;
1768 bfd_byte * foo;
1769 struct coff_arm_link_hash_table * globals;
1770 #if 0
1771 static char test_char = '1';
1772 #endif
1773
1774 globals = coff_arm_hash_table (info);
1775
1776 BFD_ASSERT (globals != NULL);
1777
1778 if (globals->arm_glue_size != 0)
1779 {
1780 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1781
1782 s = bfd_get_section_by_name
1783 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1784
1785 BFD_ASSERT (s != NULL);
1786
1787 foo = (bfd_byte *) bfd_alloc
1788 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1789 #if 0
1790 memset (foo, test_char, globals->arm_glue_size);
1791 #endif
1792
1793 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1794 s->contents = foo;
1795 }
1796
1797 if (globals->thumb_glue_size != 0)
1798 {
1799 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1800
1801 s = bfd_get_section_by_name
1802 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1803
1804 BFD_ASSERT (s != NULL);
1805
1806 foo = (bfd_byte *) bfd_alloc
1807 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1808 #if 0
1809 memset (foo, test_char, globals->thumb_glue_size);
1810 #endif
1811
1812 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1813 s->contents = foo;
1814 }
1815
1816 return true;
1817 }
1818
1819 static void
1820 record_arm_to_thumb_glue (info, h)
1821 struct bfd_link_info * info;
1822 struct coff_link_hash_entry * h;
1823 {
1824 const char * name = h->root.root.string;
1825 register asection * s;
1826 char * tmp_name;
1827 struct coff_link_hash_entry * myh;
1828 struct coff_arm_link_hash_table * globals;
1829
1830 globals = coff_arm_hash_table (info);
1831
1832 BFD_ASSERT (globals != NULL);
1833 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1834
1835 s = bfd_get_section_by_name
1836 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1837
1838 BFD_ASSERT (s != NULL);
1839
1840 tmp_name = ((char *)
1841 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1842
1843 BFD_ASSERT (tmp_name);
1844
1845 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1846
1847 myh = coff_link_hash_lookup
1848 (coff_hash_table (info), tmp_name, false, false, true);
1849
1850 if (myh != NULL)
1851 {
1852 free (tmp_name);
1853 return; /* we've already seen this guy */
1854 }
1855
1856 /* The only trick here is using globals->arm_glue_size as the value. Even
1857 though the section isn't allocated yet, this is where we will be putting
1858 it. */
1859
1860 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1861 BSF_GLOBAL,
1862 s, globals->arm_glue_size + 1,
1863 NULL, true, false,
1864 (struct bfd_link_hash_entry **) & myh);
1865
1866 free (tmp_name);
1867
1868 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1869
1870 return;
1871 }
1872
1873 static void
1874 record_thumb_to_arm_glue (info, h)
1875 struct bfd_link_info * info;
1876 struct coff_link_hash_entry * h;
1877 {
1878 const char * name = h->root.root.string;
1879 register asection * s;
1880 char * tmp_name;
1881 struct coff_link_hash_entry * myh;
1882 struct coff_arm_link_hash_table * globals;
1883
1884
1885 globals = coff_arm_hash_table (info);
1886
1887 BFD_ASSERT (globals != NULL);
1888 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1889
1890 s = bfd_get_section_by_name
1891 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1892
1893 BFD_ASSERT (s != NULL);
1894
1895 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1896
1897 BFD_ASSERT (tmp_name);
1898
1899 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1900
1901 myh = coff_link_hash_lookup
1902 (coff_hash_table (info), tmp_name, false, false, true);
1903
1904 if (myh != NULL)
1905 {
1906 free (tmp_name);
1907 return; /* we've already seen this guy */
1908 }
1909
1910 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1911 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1912 NULL, true, false,
1913 (struct bfd_link_hash_entry **) & myh);
1914
1915 /* If we mark it 'thumb', the disassembler will do a better job. */
1916 myh->class = C_THUMBEXTFUNC;
1917
1918 free (tmp_name);
1919
1920 /* Allocate another symbol to mark where we switch to arm mode. */
1921
1922 #define CHANGE_TO_ARM "__%s_change_to_arm"
1923 #define BACK_FROM_ARM "__%s_back_from_arm"
1924
1925 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1926
1927 BFD_ASSERT (tmp_name);
1928
1929 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1930
1931 myh = NULL;
1932
1933 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1934 BSF_LOCAL, s, globals->thumb_glue_size
1935 + (globals->support_old_code ? 8 : 4),
1936 NULL, true, false,
1937 (struct bfd_link_hash_entry **) & myh);
1938
1939 free (tmp_name);
1940
1941 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1942
1943 return;
1944 }
1945
1946 /* Select a BFD to be used to hold the sections used by the glue code.
1947 This function is called from the linker scripts in ld/emultempl/
1948 {armcoff/pe}.em */
1949
1950 boolean
1951 bfd_arm_get_bfd_for_interworking (abfd, info)
1952 bfd * abfd;
1953 struct bfd_link_info * info;
1954 {
1955 struct coff_arm_link_hash_table * globals;
1956 flagword flags;
1957 asection * sec;
1958
1959 /* If we are only performing a partial link do not bother
1960 getting a bfd to hold the glue. */
1961 if (info->relocateable)
1962 return true;
1963
1964 globals = coff_arm_hash_table (info);
1965
1966 BFD_ASSERT (globals != NULL);
1967
1968 if (globals->bfd_of_glue_owner != NULL)
1969 return true;
1970
1971 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1972
1973 if (sec == NULL)
1974 {
1975 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1976
1977 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1978
1979 if (sec == NULL
1980 || ! bfd_set_section_flags (abfd, sec, flags)
1981 || ! bfd_set_section_alignment (abfd, sec, 2))
1982 return false;
1983 }
1984
1985 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1986
1987 if (sec == NULL)
1988 {
1989 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1990
1991 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1992
1993 if (sec == NULL
1994 || ! bfd_set_section_flags (abfd, sec, flags)
1995 || ! bfd_set_section_alignment (abfd, sec, 2))
1996 return false;
1997 }
1998
1999 /* Save the bfd for later use. */
2000 globals->bfd_of_glue_owner = abfd;
2001
2002 return true;
2003 }
2004
2005 boolean
2006 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2007 bfd * abfd;
2008 struct bfd_link_info * info;
2009 int support_old_code;
2010 {
2011 asection * sec;
2012 struct coff_arm_link_hash_table * globals;
2013
2014 /* If we are only performing a partial link do not bother
2015 to construct any glue. */
2016 if (info->relocateable)
2017 return true;
2018
2019 /* Here we have a bfd that is to be included on the link. We have a hook
2020 to do reloc rummaging, before section sizes are nailed down. */
2021
2022 _bfd_coff_get_external_symbols (abfd);
2023
2024 globals = coff_arm_hash_table (info);
2025
2026 BFD_ASSERT (globals != NULL);
2027 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2028
2029 globals->support_old_code = support_old_code;
2030
2031 /* Rummage around all the relocs and map the glue vectors. */
2032 sec = abfd->sections;
2033
2034 if (sec == NULL)
2035 return true;
2036
2037 for (; sec != NULL; sec = sec->next)
2038 {
2039 struct internal_reloc * i;
2040 struct internal_reloc * rel;
2041
2042 if (sec->reloc_count == 0)
2043 continue;
2044
2045 /* Load the relocs. */
2046 /* FIXME: there may be a storage leak here. */
2047
2048 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2049
2050 BFD_ASSERT (i != 0);
2051
2052 for (rel = i; rel < i + sec->reloc_count; ++rel)
2053 {
2054 unsigned short r_type = rel->r_type;
2055 long symndx;
2056 struct coff_link_hash_entry * h;
2057
2058 symndx = rel->r_symndx;
2059
2060 /* If the relocation is not against a symbol it cannot concern us. */
2061 if (symndx == -1)
2062 continue;
2063
2064 /* If the index is outside of the range of our table, something has gone wrong. */
2065 if (symndx >= obj_conv_table_size (abfd))
2066 {
2067 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2068 bfd_get_filename (abfd), symndx);
2069 continue;
2070 }
2071
2072 h = obj_coff_sym_hashes (abfd)[symndx];
2073
2074 /* If the relocation is against a static symbol it must be within
2075 the current section and so cannot be a cross ARM/Thumb relocation. */
2076 if (h == NULL)
2077 continue;
2078
2079 switch (r_type)
2080 {
2081 case ARM_26:
2082 /* This one is a call from arm code. We need to look up
2083 the target of the call. If it is a thumb target, we
2084 insert glue. */
2085
2086 if (h->class == C_THUMBEXTFUNC)
2087 record_arm_to_thumb_glue (info, h);
2088 break;
2089
2090 #ifndef ARM_WINCE
2091 case ARM_THUMB23:
2092 /* This one is a call from thumb code. We used to look
2093 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2094 up the target of the call. If it is an arm target, we
2095 insert glue. If the symbol does not exist it will be
2096 given a class of C_EXT and so we will generate a stub
2097 for it. This is not really a problem, since the link
2098 is doomed anyway. */
2099
2100 switch (h->class)
2101 {
2102 case C_EXT:
2103 case C_STAT:
2104 case C_LABEL:
2105 record_thumb_to_arm_glue (info, h);
2106 break;
2107 default:
2108 ;
2109 }
2110 break;
2111 #endif
2112
2113 default:
2114 break;
2115 }
2116 }
2117 }
2118
2119 return true;
2120 }
2121
2122 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2123
2124 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2125 #define coff_relocate_section coff_arm_relocate_section
2126 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2127 #define coff_adjust_symndx coff_arm_adjust_symndx
2128 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2129 #define coff_final_link_postscript coff_arm_final_link_postscript
2130 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2131 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2132 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2133 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2134 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2135
2136
2137 /* When doing a relocateable link, we want to convert ARM26 relocs
2138 into ARM26D relocs. */
2139
2140 static boolean
2141 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2142 bfd *obfd ATTRIBUTE_UNUSED;
2143 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2144 bfd *ibfd;
2145 asection *sec;
2146 struct internal_reloc *irel;
2147 boolean *adjustedp;
2148 {
2149 if (irel->r_type == 3)
2150 {
2151 struct coff_link_hash_entry *h;
2152
2153 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2154 if (h != NULL
2155 && (h->root.type == bfd_link_hash_defined
2156 || h->root.type == bfd_link_hash_defweak)
2157 && h->root.u.def.section->output_section == sec->output_section)
2158 irel->r_type = 7;
2159 }
2160 *adjustedp = false;
2161 return true;
2162 }
2163
2164 /* Called when merging the private data areas of two BFDs.
2165 This is important as it allows us to detect if we are
2166 attempting to merge binaries compiled for different ARM
2167 targets, eg different CPUs or differents APCS's. */
2168
2169 static boolean
2170 coff_arm_merge_private_bfd_data (ibfd, obfd)
2171 bfd * ibfd;
2172 bfd * obfd;
2173 {
2174 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2175
2176 if (ibfd == obfd)
2177 return true;
2178
2179 /* If the two formats are different we cannot merge anything.
2180 This is not an error, since it is permissable to change the
2181 input and output formats. */
2182 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2183 || obfd->xvec->flavour != bfd_target_coff_flavour)
2184 return true;
2185
2186 /* Verify that the APCS is the same for the two BFDs */
2187 if (APCS_SET (ibfd))
2188 {
2189 if (APCS_SET (obfd))
2190 {
2191 /* If the src and dest have different APCS flag bits set, fail. */
2192 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2193 {
2194 _bfd_error_handler
2195 /* xgettext: c-format */
2196 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2197 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2198 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2199 );
2200
2201 bfd_set_error (bfd_error_wrong_format);
2202 return false;
2203 }
2204
2205 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2206 {
2207 const char *msg;
2208
2209 if (APCS_FLOAT_FLAG (ibfd))
2210 /* xgettext: c-format */
2211 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2212 else
2213 /* xgettext: c-format */
2214 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2215
2216 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2217 bfd_get_filename (obfd));
2218
2219 bfd_set_error (bfd_error_wrong_format);
2220 return false;
2221 }
2222
2223 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2224 {
2225 const char * msg;
2226
2227 if (PIC_FLAG (ibfd))
2228 /* xgettext: c-format */
2229 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2230 else
2231 /* xgettext: c-format */
2232 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2233 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2234 bfd_get_filename (obfd));
2235
2236 bfd_set_error (bfd_error_wrong_format);
2237 return false;
2238 }
2239 }
2240 else
2241 {
2242 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2243
2244 /* Set up the arch and fields as well as these are probably wrong. */
2245 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2246 }
2247 }
2248
2249 /* Check the interworking support. */
2250 if (INTERWORK_SET (ibfd))
2251 {
2252 if (INTERWORK_SET (obfd))
2253 {
2254 /* If the src and dest differ in their interworking issue a warning. */
2255 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2256 {
2257 const char * msg;
2258
2259 if (INTERWORK_FLAG (ibfd))
2260 /* xgettext: c-format */
2261 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2262 else
2263 /* xgettext: c-format */
2264 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2265
2266 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2267 bfd_get_filename (obfd));
2268 }
2269 }
2270 else
2271 {
2272 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2273 }
2274 }
2275
2276 return true;
2277 }
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
2323 /* Copies the given flags into the coff_tdata.flags field.
2324 Typically these flags come from the f_flags[] field of
2325 the COFF filehdr structure, which contains important,
2326 target specific information.
2327 Note: Although this function is static, it is explicitly
2328 called from both coffcode.h and peicode.h. */
2329
2330 static boolean
2331 _bfd_coff_arm_set_private_flags (abfd, flags)
2332 bfd * abfd;
2333 flagword flags;
2334 {
2335 flagword flag;
2336
2337 BFD_ASSERT (abfd != NULL);
2338
2339 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2340
2341 /* Make sure that the APCS field has not been initialised to the opposite
2342 value. */
2343 if (APCS_SET (abfd)
2344 && ( (APCS_26_FLAG (abfd) != flag)
2345 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2346 || (PIC_FLAG (abfd) != (flags & F_PIC))
2347 ))
2348 return false;
2349
2350 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2351
2352 SET_APCS_FLAGS (abfd, flag);
2353
2354 flag = (flags & F_INTERWORK);
2355
2356 /* If the BFD has already had its interworking flag set, but it
2357 is different from the value that we have been asked to set,
2358 then assume that that merged code will not support interworking
2359 and set the flag accordingly. */
2360 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2361 {
2362 if (flag)
2363 /* xgettext: c-format */
2364 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2365 bfd_get_filename (abfd));
2366 else
2367 /* xgettext: c-format */
2368 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2369 bfd_get_filename (abfd));
2370 flag = 0;
2371 }
2372
2373 SET_INTERWORK_FLAG (abfd, flag);
2374
2375 return true;
2376 }
2377
2378
2379 /* Copy the important parts of the target specific data
2380 from one instance of a BFD to another. */
2381
2382 static boolean
2383 coff_arm_copy_private_bfd_data (src, dest)
2384 bfd * src;
2385 bfd * dest;
2386 {
2387 BFD_ASSERT (src != NULL && dest != NULL);
2388
2389 if (src == dest)
2390 return true;
2391
2392 /* If the destination is not in the same format as the source, do not do
2393 the copy. */
2394 if (src->xvec != dest->xvec)
2395 return true;
2396
2397 /* copy the flags field */
2398 if (APCS_SET (src))
2399 {
2400 if (APCS_SET (dest))
2401 {
2402 /* If the src and dest have different APCS flag bits set, fail. */
2403 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2404 return false;
2405
2406 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2407 return false;
2408
2409 if (PIC_FLAG (dest) != PIC_FLAG (src))
2410 return false;
2411 }
2412 else
2413 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2414 | PIC_FLAG (src));
2415 }
2416
2417 if (INTERWORK_SET (src))
2418 {
2419 if (INTERWORK_SET (dest))
2420 {
2421 /* If the src and dest have different interworking flags then turn
2422 off the interworking bit. */
2423 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2424 {
2425 if (INTERWORK_FLAG (dest))
2426 {
2427 /* xgettext:c-format */
2428 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2429 bfd_get_filename (dest),
2430 bfd_get_filename (src));
2431 }
2432
2433 SET_INTERWORK_FLAG (dest, 0);
2434 }
2435 }
2436 else
2437 {
2438 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2439 }
2440 }
2441
2442 return true;
2443 }
2444
2445 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2446 *must* match the definitions in gcc/config/arm/coff.h and semi.h */
2447 #define LOCAL_LABEL_PREFIX "."
2448 #ifndef USER_LABEL_PREFIX
2449 #define USER_LABEL_PREFIX "_"
2450 #endif
2451
2452 /* Like _bfd_coff_is_local_label_name, but
2453 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2454 non-local.
2455 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2456 labels of the form Lxxx to be stripped. */
2457 static boolean
2458 coff_arm_is_local_label_name (abfd, name)
2459 bfd * abfd ATTRIBUTE_UNUSED;
2460 const char * name;
2461 {
2462 #ifdef USER_LABEL_PREFIX
2463 if (USER_LABEL_PREFIX[0] != 0)
2464 {
2465 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2466 return false;
2467 }
2468 #endif
2469
2470 #ifdef LOCAL_LABEL_PREFIX
2471 /* If there is a prefix for local labels then look for this.
2472 If the prefix exists, but it is empty, then ignore the test. */
2473
2474 if (LOCAL_LABEL_PREFIX[0] != 0)
2475 {
2476 int len = strlen (LOCAL_LABEL_PREFIX);
2477
2478 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2479 return false;
2480
2481 /* Perform the checks below for the rest of the name. */
2482 name += len;
2483 }
2484 #endif
2485
2486 return name[0] == 'L';
2487 }
2488
2489 /* This piece of machinery exists only to guarantee that the bfd that holds
2490 the glue section is written last.
2491
2492 This does depend on bfd_make_section attaching a new section to the
2493 end of the section list for the bfd.
2494
2495 krk@cygnus.com */
2496
2497 static boolean
2498 coff_arm_link_output_has_begun (sub, info)
2499 bfd * sub;
2500 struct coff_final_link_info * info;
2501 {
2502 return (sub->output_has_begun
2503 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2504 }
2505
2506 static boolean
2507 coff_arm_final_link_postscript (abfd, pfinfo)
2508 bfd * abfd ATTRIBUTE_UNUSED;
2509 struct coff_final_link_info * pfinfo;
2510 {
2511 struct coff_arm_link_hash_table * globals;
2512
2513 globals = coff_arm_hash_table (pfinfo->info);
2514
2515 BFD_ASSERT (globals != NULL);
2516
2517 if (globals->bfd_of_glue_owner != NULL)
2518 {
2519 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2520 return false;
2521
2522 globals->bfd_of_glue_owner->output_has_begun = true;
2523 }
2524
2525 return true;
2526 }
2527
2528 #include "coffcode.h"
2529
2530 #ifndef TARGET_LITTLE_SYM
2531 #define TARGET_LITTLE_SYM armcoff_little_vec
2532 #endif
2533 #ifndef TARGET_LITTLE_NAME
2534 #define TARGET_LITTLE_NAME "coff-arm-little"
2535 #endif
2536 #ifndef TARGET_BIG_SYM
2537 #define TARGET_BIG_SYM armcoff_big_vec
2538 #endif
2539 #ifndef TARGET_BIG_NAME
2540 #define TARGET_BIG_NAME "coff-arm-big"
2541 #endif
2542
2543 #ifndef TARGET_UNDERSCORE
2544 #define TARGET_UNDERSCORE 0
2545 #endif
2546
2547 #ifdef COFF_WITH_PE
2548 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2549 #else
2550 #define EXTRA_S_FLAGS 0
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)
2559
GDB Binutils - Deliverables
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