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