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2000-05-04 Michael Snyder <msnyder@seadog.cygnus.com>
[binutils.git] / bfd / coff-arm.c
blob2b89b848c8cd9095fb2bc7920f89126ceb6ed71e
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 (sym != NULL && sym->n_scnum != 0)
1250 addend += sym->n_value;
1251 }
1252
1253 val = 0;
1254
1255 if (h == NULL)
1256 {
1257 asection *sec;
1258
1259 if (symndx == -1)
1260 {
1261 sec = bfd_abs_section_ptr;
1262 val = 0;
1263 }
1264 else
1265 {
1266 sec = sections[symndx];
1267 val = (sec->output_section->vma
1268 + sec->output_offset
1269 + sym->n_value
1270 - sec->vma);
1271 }
1272 }
1273 else
1274 {
1275 #if 1 /* THUMBEXTENSION */
1276 /* We don't output the stubs if we are generating a
1277 relocatable output file, since we may as well leave the
1278 stub generation to the final linker pass. If we fail to
1279 verify that the name is defined, we'll try to build stubs
1280 for an undefined name... */
1281 if (! info->relocateable
1282 && ( h->root.type == bfd_link_hash_defined
1283 || h->root.type == bfd_link_hash_defweak))
1284 {
1285 asection * h_sec = h->root.u.def.section;
1286 const char * name = h->root.root.string;
1287
1288 /* h locates the symbol referenced in the reloc. */
1289 h_val = (h->root.u.def.value
1290 + h_sec->output_section->vma
1291 + h_sec->output_offset);
1292
1293 if (howto->type == ARM_26)
1294 {
1295 if ( h->class == C_THUMBSTATFUNC
1296 || h->class == C_THUMBEXTFUNC)
1297 {
1298 /* Arm code calling a Thumb function */
1299 unsigned long int tmp;
1300 long int my_offset;
1301 asection * s;
1302 long int ret_offset;
1303 struct coff_link_hash_entry * myh;
1304 struct coff_arm_link_hash_table * globals;
1305
1306 myh = find_arm_glue (info, name, input_bfd);
1307 if (myh == NULL)
1308 return false;
1309
1310 globals = coff_arm_hash_table (info);
1311
1312 BFD_ASSERT (globals != NULL);
1313 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1314
1315 my_offset = myh->root.u.def.value;
1316
1317 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1318 ARM2THUMB_GLUE_SECTION_NAME);
1319 BFD_ASSERT (s != NULL);
1320 BFD_ASSERT (s->contents != NULL);
1321 BFD_ASSERT (s->output_section != NULL);
1322
1323 if ((my_offset & 0x01) == 0x01)
1324 {
1325 if (h_sec->owner != NULL
1326 && INTERWORK_SET (h_sec->owner)
1327 && ! INTERWORK_FLAG (h_sec->owner))
1328 {
1329 _bfd_error_handler
1330 /* xgettext:c-format */
1331 (_("%s(%s): warning: interworking not enabled."),
1332 bfd_get_filename (h_sec->owner), name);
1333 _bfd_error_handler
1334 /* xgettext:c-format */
1335 (_(" first occurrence: %s: arm call to thumb"),
1336 bfd_get_filename (input_bfd));
1337 }
1338
1339 --my_offset;
1340 myh->root.u.def.value = my_offset;
1341
1342 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1343 s->contents + my_offset);
1344
1345 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1346 s->contents + my_offset + 4);
1347
1348 /* It's a thumb address. Add the low order bit. */
1349 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1350 s->contents + my_offset + 8);
1351
1352 if (info->base_file)
1353 arm_emit_base_file_entry (info, output_bfd, s,
1354 my_offset + 8);
1355
1356 }
1357
1358 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1359
1360 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1361 - input_section->vma);
1362
1363 tmp = tmp & 0xFF000000;
1364
1365 /* Somehow these are both 4 too far, so subtract 8. */
1366 ret_offset =
1367 s->output_offset
1368 + my_offset
1369 + s->output_section->vma
1370 - (input_section->output_offset
1371 + input_section->output_section->vma
1372 + rel->r_vaddr)
1373 - 8;
1374
1375 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1376
1377 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1378 - input_section->vma);
1379 done = 1;
1380 }
1381 }
1382
1383 #ifndef ARM_WINCE
1384 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1385 else if (howto->type == ARM_THUMB23)
1386 {
1387 if ( h->class == C_EXT
1388 || h->class == C_STAT
1389 || h->class == C_LABEL)
1390 {
1391 /* Thumb code calling an ARM function */
1392 asection * s = 0;
1393 long int my_offset;
1394 unsigned long int tmp;
1395 long int ret_offset;
1396 struct coff_link_hash_entry * myh;
1397 struct coff_arm_link_hash_table * globals;
1398
1399 myh = find_thumb_glue (info, name, input_bfd);
1400 if (myh == NULL)
1401 return false;
1402
1403 globals = coff_arm_hash_table (info);
1404
1405 BFD_ASSERT (globals != NULL);
1406 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1407
1408 my_offset = myh->root.u.def.value;
1409
1410 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1411 THUMB2ARM_GLUE_SECTION_NAME);
1412
1413 BFD_ASSERT (s != NULL);
1414 BFD_ASSERT (s->contents != NULL);
1415 BFD_ASSERT (s->output_section != NULL);
1416
1417 if ((my_offset & 0x01) == 0x01)
1418 {
1419 if (h_sec->owner != NULL
1420 && INTERWORK_SET (h_sec->owner)
1421 && ! INTERWORK_FLAG (h_sec->owner)
1422 && ! globals->support_old_code)
1423 {
1424 _bfd_error_handler
1425 /* xgettext:c-format */
1426 (_("%s(%s): warning: interworking not enabled."),
1427 bfd_get_filename (h_sec->owner), name);
1428 _bfd_error_handler
1429 /* xgettext:c-format */
1430 (_(" first occurrence: %s: thumb call to arm"),
1431 bfd_get_filename (input_bfd));
1432 _bfd_error_handler
1433 (_(" consider relinking with --support-old-code enabled"));
1434 }
1435
1436 -- my_offset;
1437 myh->root.u.def.value = my_offset;
1438
1439 if (globals->support_old_code)
1440 {
1441 bfd_put_16 (output_bfd, t2a1_push_insn,
1442 s->contents + my_offset);
1443
1444 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1445 s->contents + my_offset + 2);
1446
1447 bfd_put_16 (output_bfd, t2a3_mov_insn,
1448 s->contents + my_offset + 4);
1449
1450 bfd_put_16 (output_bfd, t2a4_bx_insn,
1451 s->contents + my_offset + 6);
1452
1453 bfd_put_32 (output_bfd, t2a5_pop_insn,
1454 s->contents + my_offset + 8);
1455
1456 bfd_put_32 (output_bfd, t2a6_bx_insn,
1457 s->contents + my_offset + 12);
1458
1459 /* Store the address of the function in the last word of the stub. */
1460 bfd_put_32 (output_bfd, h_val,
1461 s->contents + my_offset + 16);
1462
1463 if (info->base_file)
1464 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1465 }
1466 else
1467 {
1468 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1469 s->contents + my_offset);
1470
1471 bfd_put_16 (output_bfd, t2a2_noop_insn,
1472 s->contents + my_offset + 2);
1473
1474 ret_offset =
1475 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1476 - ((bfd_signed_vma)
1477 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1478 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1479 + s->output_section->vma) /* Address of the start of the current section. */
1480 + 4 /* The branch instruction is 4 bytes into the stub. */
1481 + 8); /* ARM branches work from the pc of the instruction + 8. */
1482
1483 bfd_put_32 (output_bfd,
1484 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1485 s->contents + my_offset + 4);
1486
1487 }
1488 }
1489
1490 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1491
1492 /* Now go back and fix up the original BL insn to point
1493 to here. */
1494 ret_offset =
1495 s->output_offset
1496 + my_offset
1497 - (input_section->output_offset
1498 + rel->r_vaddr)
1499 -4;
1500
1501 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1502 - input_section->vma);
1503
1504 bfd_put_32 (output_bfd,
1505 insert_thumb_branch (tmp, ret_offset),
1506 contents + rel->r_vaddr
1507 - input_section->vma);
1508
1509 done = 1;
1510 }
1511 }
1512 #endif
1513 }
1514
1515 /* If the relocation type and destination symbol does not
1516 fall into one of the above categories, then we can just
1517 perform a direct link. */
1518
1519 if (done)
1520 rstat = bfd_reloc_ok;
1521 else
1522 #endif /* THUMBEXTENSION */
1523 if ( h->root.type == bfd_link_hash_defined
1524 || h->root.type == bfd_link_hash_defweak)
1525 {
1526 asection *sec;
1527
1528 sec = h->root.u.def.section;
1529 val = (h->root.u.def.value
1530 + sec->output_section->vma
1531 + sec->output_offset);
1532 }
1533
1534 else if (! info->relocateable)
1535 {
1536 if (! ((*info->callbacks->undefined_symbol)
1537 (info, h->root.root.string, input_bfd, input_section,
1538 rel->r_vaddr - input_section->vma, true)))
1539 return false;
1540 }
1541 }
1542
1543 if (info->base_file)
1544 {
1545 /* Emit a reloc if the backend thinks it needs it. */
1546 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1547 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1548 }
1549
1550 #if 1 /* THUMBEXTENSION */
1551 if (done)
1552 rstat = bfd_reloc_ok;
1553 #ifndef ARM_WINCE
1554 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1555 else if (! info->relocateable
1556 && howto->type == ARM_THUMB23)
1557 {
1558 /* This is pretty much a copy of what the default
1559 _bfd_final_link_relocate and _bfd_relocate_contents
1560 routines do to perform a relocation, with special
1561 processing for the split addressing of the Thumb BL
1562 instruction. Again, it would probably be simpler adding a
1563 ThumbBRANCH23 specific macro expansion into the default
1564 code. */
1565
1566 bfd_vma address = rel->r_vaddr - input_section->vma;
1567
1568 if (address > input_section->_raw_size)
1569 rstat = bfd_reloc_outofrange;
1570 else
1571 {
1572 bfd_vma relocation = val + addend;
1573 int size = bfd_get_reloc_size (howto);
1574 boolean overflow = false;
1575 bfd_byte * location = contents + address;
1576 bfd_vma x = bfd_get_32 (input_bfd, location);
1577 bfd_vma src_mask = 0x007FFFFE;
1578 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1579 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1580 bfd_vma check;
1581 bfd_signed_vma signed_check;
1582 bfd_vma add;
1583 bfd_signed_vma signed_add;
1584
1585 BFD_ASSERT (size == 4);
1586
1587 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1588 relocation -= (input_section->output_section->vma
1589 + input_section->output_offset);
1590
1591 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1592 relocation -= address;
1593
1594 /* No need to negate the relocation with BRANCH23. */
1595 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1596 /* howto->rightshift == 1 */
1597 /* Drop unwanted bits from the value we are relocating to. */
1598
1599 check = relocation >> howto->rightshift;
1600
1601 /* If this is a signed value, the rightshift just dropped
1602 leading 1 bits (assuming twos complement). */
1603 if ((bfd_signed_vma) relocation >= 0)
1604 signed_check = check;
1605 else
1606 signed_check = (check
1607 | ((bfd_vma) - 1
1608 & ~((bfd_vma) - 1 >> howto->rightshift)));
1609
1610 /* Get the value from the object file. */
1611 if (bfd_big_endian (input_bfd))
1612 {
1613 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1614 }
1615 else
1616 {
1617 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1618 }
1619
1620 /* Get the value from the object file with an appropriate sign.
1621 The expression involving howto->src_mask isolates the upper
1622 bit of src_mask. If that bit is set in the value we are
1623 adding, it is negative, and we subtract out that number times
1624 two. If src_mask includes the highest possible bit, then we
1625 can not get the upper bit, but that does not matter since
1626 signed_add needs no adjustment to become negative in that
1627 case. */
1628
1629 signed_add = add;
1630
1631 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1632 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1633
1634 /* Add the value from the object file, shifted so that it is a
1635 straight number. */
1636 /* howto->bitpos == 0 */
1637
1638 signed_check += signed_add;
1639 relocation += signed_add;
1640
1641 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1642
1643 /* Assumes two's complement. */
1644 if ( signed_check > reloc_signed_max
1645 || signed_check < reloc_signed_min)
1646 overflow = true;
1647
1648 /* Put RELOCATION into the correct bits: */
1649
1650 if (bfd_big_endian (input_bfd))
1651 {
1652 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1653 }
1654 else
1655 {
1656 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1657 }
1658
1659 /* Add RELOCATION to the correct bits of X: */
1660 x = ((x & ~howto->dst_mask) | relocation);
1661
1662 /* Put the relocated value back in the object file: */
1663 bfd_put_32 (input_bfd, x, location);
1664
1665 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1666 }
1667 }
1668 #endif
1669 else
1670 #endif /* THUMBEXTENSION */
1671 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1672 contents,
1673 rel->r_vaddr - input_section->vma,
1674 val, addend);
1675 #if 1 /* THUMBEXTENSION */
1676 /* FIXME:
1677 Is this the best way to fix up thumb addresses? krk@cygnus.com
1678 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1679 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1680 if (! info->relocateable
1681 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1682 {
1683 /* Determine if we need to set the bottom bit of a relocated address
1684 because the address is the address of a Thumb code symbol. */
1685
1686 int patchit = false;
1687
1688 if (h != NULL
1689 && ( h->class == C_THUMBSTATFUNC
1690 || h->class == C_THUMBEXTFUNC))
1691 {
1692 patchit = true;
1693 }
1694 else if (sym != NULL
1695 && sym->n_scnum > N_UNDEF)
1696 {
1697 /* No hash entry - use the symbol instead. */
1698
1699 if ( sym->n_sclass == C_THUMBSTATFUNC
1700 || sym->n_sclass == C_THUMBEXTFUNC)
1701 patchit = true;
1702 }
1703
1704 if (patchit)
1705 {
1706 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1707 bfd_vma x = bfd_get_32 (input_bfd, location);
1708
1709 bfd_put_32 (input_bfd, x | 1, location);
1710 }
1711 }
1712 #endif /* THUMBEXTENSION */
1713
1714 switch (rstat)
1715 {
1716 default:
1717 abort ();
1718 case bfd_reloc_ok:
1719 break;
1720 case bfd_reloc_outofrange:
1721 (*_bfd_error_handler)
1722 (_("%s: bad reloc address 0x%lx in section `%s'"),
1723 bfd_get_filename (input_bfd),
1724 (unsigned long) rel->r_vaddr,
1725 bfd_get_section_name (input_bfd, input_section));
1726 return false;
1727 case bfd_reloc_overflow:
1728 {
1729 const char *name;
1730 char buf[SYMNMLEN + 1];
1731
1732 if (symndx == -1)
1733 name = "*ABS*";
1734 else if (h != NULL)
1735 name = h->root.root.string;
1736 else
1737 {
1738 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1739 if (name == NULL)
1740 return false;
1741 }
1742
1743 if (! ((*info->callbacks->reloc_overflow)
1744 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1745 input_section, rel->r_vaddr - input_section->vma)))
1746 return false;
1747 }
1748 }
1749 }
1750
1751 return true;
1752 }
1753
1754 #ifndef COFF_IMAGE_WITH_PE
1755
1756 boolean
1757 bfd_arm_allocate_interworking_sections (info)
1758 struct bfd_link_info * info;
1759 {
1760 asection * s;
1761 bfd_byte * foo;
1762 struct coff_arm_link_hash_table * globals;
1763 #if 0
1764 static char test_char = '1';
1765 #endif
1766
1767 globals = coff_arm_hash_table (info);
1768
1769 BFD_ASSERT (globals != NULL);
1770
1771 if (globals->arm_glue_size != 0)
1772 {
1773 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1774
1775 s = bfd_get_section_by_name
1776 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1777
1778 BFD_ASSERT (s != NULL);
1779
1780 foo = (bfd_byte *) bfd_alloc
1781 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1782 #if 0
1783 memset (foo, test_char, globals->arm_glue_size);
1784 #endif
1785
1786 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1787 s->contents = foo;
1788 }
1789
1790 if (globals->thumb_glue_size != 0)
1791 {
1792 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1793
1794 s = bfd_get_section_by_name
1795 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1796
1797 BFD_ASSERT (s != NULL);
1798
1799 foo = (bfd_byte *) bfd_alloc
1800 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1801 #if 0
1802 memset (foo, test_char, globals->thumb_glue_size);
1803 #endif
1804
1805 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1806 s->contents = foo;
1807 }
1808
1809 return true;
1810 }
1811
1812 static void
1813 record_arm_to_thumb_glue (info, h)
1814 struct bfd_link_info * info;
1815 struct coff_link_hash_entry * h;
1816 {
1817 const char * name = h->root.root.string;
1818 register asection * s;
1819 char * tmp_name;
1820 struct coff_link_hash_entry * myh;
1821 struct coff_arm_link_hash_table * globals;
1822
1823 globals = coff_arm_hash_table (info);
1824
1825 BFD_ASSERT (globals != NULL);
1826 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1827
1828 s = bfd_get_section_by_name
1829 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1830
1831 BFD_ASSERT (s != NULL);
1832
1833 tmp_name = ((char *)
1834 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1835
1836 BFD_ASSERT (tmp_name);
1837
1838 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1839
1840 myh = coff_link_hash_lookup
1841 (coff_hash_table (info), tmp_name, false, false, true);
1842
1843 if (myh != NULL)
1844 {
1845 free (tmp_name);
1846 return; /* we've already seen this guy */
1847 }
1848
1849 /* The only trick here is using globals->arm_glue_size as the value. Even
1850 though the section isn't allocated yet, this is where we will be putting
1851 it. */
1852
1853 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1854 BSF_GLOBAL,
1855 s, globals->arm_glue_size + 1,
1856 NULL, true, false,
1857 (struct bfd_link_hash_entry **) & myh);
1858
1859 free (tmp_name);
1860
1861 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1862
1863 return;
1864 }
1865
1866 static void
1867 record_thumb_to_arm_glue (info, h)
1868 struct bfd_link_info * info;
1869 struct coff_link_hash_entry * h;
1870 {
1871 const char * name = h->root.root.string;
1872 register asection * s;
1873 char * tmp_name;
1874 struct coff_link_hash_entry * myh;
1875 struct coff_arm_link_hash_table * globals;
1876
1877
1878 globals = coff_arm_hash_table (info);
1879
1880 BFD_ASSERT (globals != NULL);
1881 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1882
1883 s = bfd_get_section_by_name
1884 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1885
1886 BFD_ASSERT (s != NULL);
1887
1888 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1889
1890 BFD_ASSERT (tmp_name);
1891
1892 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1893
1894 myh = coff_link_hash_lookup
1895 (coff_hash_table (info), tmp_name, false, false, true);
1896
1897 if (myh != NULL)
1898 {
1899 free (tmp_name);
1900 return; /* we've already seen this guy */
1901 }
1902
1903 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1904 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1905 NULL, true, false,
1906 (struct bfd_link_hash_entry **) & myh);
1907
1908 /* If we mark it 'thumb', the disassembler will do a better job. */
1909 myh->class = C_THUMBEXTFUNC;
1910
1911 free (tmp_name);
1912
1913 /* Allocate another symbol to mark where we switch to arm mode. */
1914
1915 #define CHANGE_TO_ARM "__%s_change_to_arm"
1916 #define BACK_FROM_ARM "__%s_back_from_arm"
1917
1918 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1919
1920 BFD_ASSERT (tmp_name);
1921
1922 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1923
1924 myh = NULL;
1925
1926 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1927 BSF_LOCAL, s, globals->thumb_glue_size
1928 + (globals->support_old_code ? 8 : 4),
1929 NULL, true, false,
1930 (struct bfd_link_hash_entry **) & myh);
1931
1932 free (tmp_name);
1933
1934 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1935
1936 return;
1937 }
1938
1939 /* Select a BFD to be used to hold the sections used by the glue code.
1940 This function is called from the linker scripts in ld/emultempl/
1941 {armcoff/pe}.em */
1942
1943 boolean
1944 bfd_arm_get_bfd_for_interworking (abfd, info)
1945 bfd * abfd;
1946 struct bfd_link_info * info;
1947 {
1948 struct coff_arm_link_hash_table * globals;
1949 flagword flags;
1950 asection * sec;
1951
1952 /* If we are only performing a partial link do not bother
1953 getting a bfd to hold the glue. */
1954 if (info->relocateable)
1955 return true;
1956
1957 globals = coff_arm_hash_table (info);
1958
1959 BFD_ASSERT (globals != NULL);
1960
1961 if (globals->bfd_of_glue_owner != NULL)
1962 return true;
1963
1964 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1965
1966 if (sec == NULL)
1967 {
1968 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1969
1970 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1971
1972 if (sec == NULL
1973 || ! bfd_set_section_flags (abfd, sec, flags)
1974 || ! bfd_set_section_alignment (abfd, sec, 2))
1975 return false;
1976 }
1977
1978 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1979
1980 if (sec == NULL)
1981 {
1982 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1983
1984 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1985
1986 if (sec == NULL
1987 || ! bfd_set_section_flags (abfd, sec, flags)
1988 || ! bfd_set_section_alignment (abfd, sec, 2))
1989 return false;
1990 }
1991
1992 /* Save the bfd for later use. */
1993 globals->bfd_of_glue_owner = abfd;
1994
1995 return true;
1996 }
1997
1998 boolean
1999 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2000 bfd * abfd;
2001 struct bfd_link_info * info;
2002 int support_old_code;
2003 {
2004 asection * sec;
2005 struct coff_arm_link_hash_table * globals;
2006
2007 /* If we are only performing a partial link do not bother
2008 to construct any glue. */
2009 if (info->relocateable)
2010 return true;
2011
2012 /* Here we have a bfd that is to be included on the link. We have a hook
2013 to do reloc rummaging, before section sizes are nailed down. */
2014
2015 _bfd_coff_get_external_symbols (abfd);
2016
2017 globals = coff_arm_hash_table (info);
2018
2019 BFD_ASSERT (globals != NULL);
2020 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2021
2022 globals->support_old_code = support_old_code;
2023
2024 /* Rummage around all the relocs and map the glue vectors. */
2025 sec = abfd->sections;
2026
2027 if (sec == NULL)
2028 return true;
2029
2030 for (; sec != NULL; sec = sec->next)
2031 {
2032 struct internal_reloc * i;
2033 struct internal_reloc * rel;
2034
2035 if (sec->reloc_count == 0)
2036 continue;
2037
2038 /* Load the relocs. */
2039 /* FIXME: there may be a storage leak here. */
2040
2041 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2042
2043 BFD_ASSERT (i != 0);
2044
2045 for (rel = i; rel < i + sec->reloc_count; ++rel)
2046 {
2047 unsigned short r_type = rel->r_type;
2048 long symndx;
2049 struct coff_link_hash_entry * h;
2050
2051 symndx = rel->r_symndx;
2052
2053 /* If the relocation is not against a symbol it cannot concern us. */
2054 if (symndx == -1)
2055 continue;
2056
2057 /* If the index is outside of the range of our table, something has gone wrong. */
2058 if (symndx >= obj_conv_table_size (abfd))
2059 {
2060 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2061 bfd_get_filename (abfd), symndx);
2062 continue;
2063 }
2064
2065 h = obj_coff_sym_hashes (abfd)[symndx];
2066
2067 /* If the relocation is against a static symbol it must be within
2068 the current section and so cannot be a cross ARM/Thumb relocation. */
2069 if (h == NULL)
2070 continue;
2071
2072 switch (r_type)
2073 {
2074 case ARM_26:
2075 /* This one is a call from arm code. We need to look up
2076 the target of the call. If it is a thumb target, we
2077 insert glue. */
2078
2079 if (h->class == C_THUMBEXTFUNC)
2080 record_arm_to_thumb_glue (info, h);
2081 break;
2082
2083 #ifndef ARM_WINCE
2084 case ARM_THUMB23:
2085 /* This one is a call from thumb code. We used to look
2086 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2087 up the target of the call. If it is an arm target, we
2088 insert glue. If the symbol does not exist it will be
2089 given a class of C_EXT and so we will generate a stub
2090 for it. This is not really a problem, since the link
2091 is doomed anyway. */
2092
2093 switch (h->class)
2094 {
2095 case C_EXT:
2096 case C_STAT:
2097 case C_LABEL:
2098 record_thumb_to_arm_glue (info, h);
2099 break;
2100 default:
2101 ;
2102 }
2103 break;
2104 #endif
2105
2106 default:
2107 break;
2108 }
2109 }
2110 }
2111
2112 return true;
2113 }
2114
2115 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2116
2117 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2118 #define coff_relocate_section coff_arm_relocate_section
2119 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2120 #define coff_adjust_symndx coff_arm_adjust_symndx
2121 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2122 #define coff_final_link_postscript coff_arm_final_link_postscript
2123 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2124 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2125 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2126 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2127 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2128
2129
2130 /* When doing a relocateable link, we want to convert ARM26 relocs
2131 into ARM26D relocs. */
2132
2133 static boolean
2134 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2135 bfd *obfd ATTRIBUTE_UNUSED;
2136 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2137 bfd *ibfd;
2138 asection *sec;
2139 struct internal_reloc *irel;
2140 boolean *adjustedp;
2141 {
2142 if (irel->r_type == 3)
2143 {
2144 struct coff_link_hash_entry *h;
2145
2146 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2147 if (h != NULL
2148 && (h->root.type == bfd_link_hash_defined
2149 || h->root.type == bfd_link_hash_defweak)
2150 && h->root.u.def.section->output_section == sec->output_section)
2151 irel->r_type = 7;
2152 }
2153 *adjustedp = false;
2154 return true;
2155 }
2156
2157 /* Called when merging the private data areas of two BFDs.
2158 This is important as it allows us to detect if we are
2159 attempting to merge binaries compiled for different ARM
2160 targets, eg different CPUs or differents APCS's. */
2161
2162 static boolean
2163 coff_arm_merge_private_bfd_data (ibfd, obfd)
2164 bfd * ibfd;
2165 bfd * obfd;
2166 {
2167 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2168
2169 if (ibfd == obfd)
2170 return true;
2171
2172 /* If the two formats are different we cannot merge anything.
2173 This is not an error, since it is permissable to change the
2174 input and output formats. */
2175 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2176 || obfd->xvec->flavour != bfd_target_coff_flavour)
2177 return true;
2178
2179 /* Verify that the APCS is the same for the two BFDs */
2180 if (APCS_SET (ibfd))
2181 {
2182 if (APCS_SET (obfd))
2183 {
2184 /* If the src and dest have different APCS flag bits set, fail. */
2185 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2186 {
2187 _bfd_error_handler
2188 /* xgettext: c-format */
2189 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2190 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2191 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2192 );
2193
2194 bfd_set_error (bfd_error_wrong_format);
2195 return false;
2196 }
2197
2198 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2199 {
2200 const char *msg;
2201
2202 if (APCS_FLOAT_FLAG (ibfd))
2203 /* xgettext: c-format */
2204 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2205 else
2206 /* xgettext: c-format */
2207 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2208
2209 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2210 bfd_get_filename (obfd));
2211
2212 bfd_set_error (bfd_error_wrong_format);
2213 return false;
2214 }
2215
2216 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2217 {
2218 const char * msg;
2219
2220 if (PIC_FLAG (ibfd))
2221 /* xgettext: c-format */
2222 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2223 else
2224 /* xgettext: c-format */
2225 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2226 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2227 bfd_get_filename (obfd));
2228
2229 bfd_set_error (bfd_error_wrong_format);
2230 return false;
2231 }
2232 }
2233 else
2234 {
2235 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2236
2237 /* Set up the arch and fields as well as these are probably wrong. */
2238 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2239 }
2240 }
2241
2242 /* Check the interworking support. */
2243 if (INTERWORK_SET (ibfd))
2244 {
2245 if (INTERWORK_SET (obfd))
2246 {
2247 /* If the src and dest differ in their interworking issue a warning. */
2248 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2249 {
2250 const char * msg;
2251
2252 if (INTERWORK_FLAG (ibfd))
2253 /* xgettext: c-format */
2254 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2255 else
2256 /* xgettext: c-format */
2257 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2258
2259 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2260 bfd_get_filename (obfd));
2261 }
2262 }
2263 else
2264 {
2265 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2266 }
2267 }
2268
2269 return true;
2270 }
2271
2272
2273 /* Display the flags field. */
2274
2275 static boolean
2276 coff_arm_print_private_bfd_data (abfd, ptr)
2277 bfd * abfd;
2278 PTR ptr;
2279 {
2280 FILE * file = (FILE *) ptr;
2281
2282 BFD_ASSERT (abfd != NULL && ptr != NULL);
2283
2284 /* xgettext:c-format */
2285 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2286
2287 if (APCS_SET (abfd))
2288 {
2289 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2290 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2291
2292 if (APCS_FLOAT_FLAG (abfd))
2293 fprintf (file, _(" [floats passed in float registers]"));
2294 else
2295 fprintf (file, _(" [floats passed in integer registers]"));
2296
2297 if (PIC_FLAG (abfd))
2298 fprintf (file, _(" [position independent]"));
2299 else
2300 fprintf (file, _(" [absolute position]"));
2301 }
2302
2303 if (! INTERWORK_SET (abfd))
2304 fprintf (file, _(" [interworking flag not initialised]"));
2305 else if (INTERWORK_FLAG (abfd))
2306 fprintf (file, _(" [interworking supported]"));
2307 else
2308 fprintf (file, _(" [interworking not supported]"));
2309
2310 fputc ('\n', file);
2311
2312 return true;
2313 }
2314
2315
2316 /* Copies the given flags into the coff_tdata.flags field.
2317 Typically these flags come from the f_flags[] field of
2318 the COFF filehdr structure, which contains important,
2319 target specific information.
2320 Note: Although this function is static, it is explicitly
2321 called from both coffcode.h and peicode.h. */
2322
2323 static boolean
2324 _bfd_coff_arm_set_private_flags (abfd, flags)
2325 bfd * abfd;
2326 flagword flags;
2327 {
2328 flagword flag;
2329
2330 BFD_ASSERT (abfd != NULL);
2331
2332 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2333
2334 /* Make sure that the APCS field has not been initialised to the opposite
2335 value. */
2336 if (APCS_SET (abfd)
2337 && ( (APCS_26_FLAG (abfd) != flag)
2338 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2339 || (PIC_FLAG (abfd) != (flags & F_PIC))
2340 ))
2341 return false;
2342
2343 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2344
2345 SET_APCS_FLAGS (abfd, flag);
2346
2347 flag = (flags & F_INTERWORK);
2348
2349 /* If the BFD has already had its interworking flag set, but it
2350 is different from the value that we have been asked to set,
2351 then assume that that merged code will not support interworking
2352 and set the flag accordingly. */
2353 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2354 {
2355 if (flag)
2356 /* xgettext: c-format */
2357 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2358 bfd_get_filename (abfd));
2359 else
2360 /* xgettext: c-format */
2361 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2362 bfd_get_filename (abfd));
2363 flag = 0;
2364 }
2365
2366 SET_INTERWORK_FLAG (abfd, flag);
2367
2368 return true;
2369 }
2370
2371
2372 /* Copy the important parts of the target specific data
2373 from one instance of a BFD to another. */
2374
2375 static boolean
2376 coff_arm_copy_private_bfd_data (src, dest)
2377 bfd * src;
2378 bfd * dest;
2379 {
2380 BFD_ASSERT (src != NULL && dest != NULL);
2381
2382 if (src == dest)
2383 return true;
2384
2385 /* If the destination is not in the same format as the source, do not do
2386 the copy. */
2387 if (src->xvec != dest->xvec)
2388 return true;
2389
2390 /* copy the flags field */
2391 if (APCS_SET (src))
2392 {
2393 if (APCS_SET (dest))
2394 {
2395 /* If the src and dest have different APCS flag bits set, fail. */
2396 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2397 return false;
2398
2399 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2400 return false;
2401
2402 if (PIC_FLAG (dest) != PIC_FLAG (src))
2403 return false;
2404 }
2405 else
2406 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2407 | PIC_FLAG (src));
2408 }
2409
2410 if (INTERWORK_SET (src))
2411 {
2412 if (INTERWORK_SET (dest))
2413 {
2414 /* If the src and dest have different interworking flags then turn
2415 off the interworking bit. */
2416 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2417 {
2418 if (INTERWORK_FLAG (dest))
2419 {
2420 /* xgettext:c-format */
2421 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2422 bfd_get_filename (dest),
2423 bfd_get_filename (src));
2424 }
2425
2426 SET_INTERWORK_FLAG (dest, 0);
2427 }
2428 }
2429 else
2430 {
2431 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2432 }
2433 }
2434
2435 return true;
2436 }
2437
2438 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2439 *must* match the definitions in gcc/config/arm/coff.h and semi.h */
2440 #define LOCAL_LABEL_PREFIX "."
2441 #ifndef USER_LABEL_PREFIX
2442 #define USER_LABEL_PREFIX "_"
2443 #endif
2444
2445 /* Like _bfd_coff_is_local_label_name, but
2446 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2447 non-local.
2448 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2449 labels of the form Lxxx to be stripped. */
2450 static boolean
2451 coff_arm_is_local_label_name (abfd, name)
2452 bfd * abfd ATTRIBUTE_UNUSED;
2453 const char * name;
2454 {
2455 #ifdef USER_LABEL_PREFIX
2456 if (USER_LABEL_PREFIX[0] != 0)
2457 {
2458 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2459 return false;
2460 }
2461 #endif
2462
2463 #ifdef LOCAL_LABEL_PREFIX
2464 /* If there is a prefix for local labels then look for this.
2465 If the prefix exists, but it is empty, then ignore the test. */
2466
2467 if (LOCAL_LABEL_PREFIX[0] != 0)
2468 {
2469 int len = strlen (LOCAL_LABEL_PREFIX);
2470
2471 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2472 return false;
2473
2474 /* Perform the checks below for the rest of the name. */
2475 name += len;
2476 }
2477 #endif
2478
2479 return name[0] == 'L';
2480 }
2481
2482 /* This piece of machinery exists only to guarantee that the bfd that holds
2483 the glue section is written last.
2484
2485 This does depend on bfd_make_section attaching a new section to the
2486 end of the section list for the bfd.
2487
2488 krk@cygnus.com */
2489
2490 static boolean
2491 coff_arm_link_output_has_begun (sub, info)
2492 bfd * sub;
2493 struct coff_final_link_info * info;
2494 {
2495 return (sub->output_has_begun
2496 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2497 }
2498
2499 static boolean
2500 coff_arm_final_link_postscript (abfd, pfinfo)
2501 bfd * abfd ATTRIBUTE_UNUSED;
2502 struct coff_final_link_info * pfinfo;
2503 {
2504 struct coff_arm_link_hash_table * globals;
2505
2506 globals = coff_arm_hash_table (pfinfo->info);
2507
2508 BFD_ASSERT (globals != NULL);
2509
2510 if (globals->bfd_of_glue_owner != NULL)
2511 {
2512 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2513 return false;
2514
2515 globals->bfd_of_glue_owner->output_has_begun = true;
2516 }
2517
2518 return true;
2519 }
2520
2521 #include "coffcode.h"
2522
2523 #ifndef TARGET_LITTLE_SYM
2524 #define TARGET_LITTLE_SYM armcoff_little_vec
2525 #endif
2526 #ifndef TARGET_LITTLE_NAME
2527 #define TARGET_LITTLE_NAME "coff-arm-little"
2528 #endif
2529 #ifndef TARGET_BIG_SYM
2530 #define TARGET_BIG_SYM armcoff_big_vec
2531 #endif
2532 #ifndef TARGET_BIG_NAME
2533 #define TARGET_BIG_NAME "coff-arm-big"
2534 #endif
2535
2536 #ifndef TARGET_UNDERSCORE
2537 #define TARGET_UNDERSCORE 0
2538 #endif
2539
2540 #ifdef COFF_WITH_PE
2541 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2542 #else
2543 #define EXTRA_S_FLAGS 0
2544 #endif
2545
2546 /* Forward declaration for use initialising alternative_target field. */
2547 extern const bfd_target TARGET_BIG_SYM ;
2548
2549 /* Target vectors. */
2550 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2551 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)
2552
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