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* emultempl/ppc64elf.em (new_vers_pattern): Warning fix.
[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, 2002
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) \
40 (coff_data (abfd)->flags & F_APCS_26)
41
42 #define APCS_FLOAT_FLAG(abfd) \
43 (coff_data (abfd)->flags & F_APCS_FLOAT)
44
45 #define PIC_FLAG(abfd) \
46 (coff_data (abfd)->flags & F_PIC)
47
48 #define APCS_SET(abfd) \
49 (coff_data (abfd)->flags & F_APCS_SET)
50
51 #define SET_APCS_FLAGS(abfd, flgs) \
52 do \
53 { \
54 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
55 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
56 } \
57 while (0)
58
59 #define INTERWORK_FLAG(abfd) \
60 (coff_data (abfd)->flags & F_INTERWORK)
61
62 #define INTERWORK_SET(abfd) \
63 (coff_data (abfd)->flags & F_INTERWORK_SET)
64
65 #define SET_INTERWORK_FLAG(abfd, flg) \
66 do \
67 { \
68 coff_data (abfd)->flags &= ~F_INTERWORK; \
69 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
70 } \
71 while (0)
72
73 #ifndef NUM_ELEM
74 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
75 #endif
76
77 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
78 /* some typedefs for holding instructions */
79 typedef unsigned long int insn32;
80 typedef unsigned short int insn16;
81
82 /* Forward declarations for stupid compilers. */
83 static boolean coff_arm_relocate_section
84 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
85 struct internal_reloc *, struct internal_syment *, asection **));
86 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
87 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
88 static bfd_reloc_status_type aoutarm_fix_pcrel_26
89 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
90 #ifndef ARM_WINCE
91 static bfd_reloc_status_type coff_thumb_pcrel_23
92 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
93 static bfd_reloc_status_type coff_thumb_pcrel_9
94 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
95 static insn32 insert_thumb_branch
96 PARAMS ((insn32, int));
97 #endif
98 static bfd_reloc_status_type coff_thumb_pcrel_12
99 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
100 static bfd_reloc_status_type coff_arm_reloc
101 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
102 static boolean coff_arm_adjust_symndx
103 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
104 asection *, struct internal_reloc *, boolean *));
105 static reloc_howto_type * coff_arm_rtype_to_howto
106 PARAMS ((bfd *, asection *, struct internal_reloc *,
107 struct coff_link_hash_entry *, struct internal_syment *,
108 bfd_vma *));
109 static bfd_reloc_status_type coff_thumb_pcrel_common
110 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
111 thumb_pcrel_branchtype));
112 static const struct reloc_howto_struct * coff_arm_reloc_type_lookup
113 PARAMS ((bfd *, bfd_reloc_code_real_type));
114 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
115 PARAMS ((bfd *));
116 static struct coff_link_hash_entry * find_thumb_glue
117 PARAMS ((struct bfd_link_info *, const char *, bfd *));
118 static struct coff_link_hash_entry * find_arm_glue
119 PARAMS ((struct bfd_link_info *, const char *, bfd *));
120 #ifndef COFF_IMAGE_WITH_PE
121 static void record_arm_to_thumb_glue
122 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
123 #ifndef ARM_WINCE
124 static void record_thumb_to_arm_glue
125 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
126 #endif
127 #endif
128 static boolean coff_arm_merge_private_bfd_data
129 PARAMS ((bfd *, bfd *));
130 static boolean coff_arm_print_private_bfd_data
131 PARAMS ((bfd *, PTR));
132 static boolean _bfd_coff_arm_set_private_flags
133 PARAMS ((bfd *, flagword));
134 static boolean coff_arm_copy_private_bfd_data
135 PARAMS ((bfd *, bfd *));
136 static boolean coff_arm_is_local_label_name
137 PARAMS ((bfd *, const char *));
138 static boolean coff_arm_link_output_has_begun
139 PARAMS ((bfd *, struct coff_final_link_info *));
140 static boolean coff_arm_final_link_postscript
141 PARAMS ((bfd *, struct coff_final_link_info *));
142 static void arm_emit_base_file_entry
143 PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
144
145 /* The linker script knows the section names for placement.
146 The entry_names are used to do simple name mangling on the stubs.
147 Given a function name, and its type, the stub can be found. The
148 name can be changed. The only requirement is the %s be present. */
149
150 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
151 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
152
153 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
154 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
155
156 /* Used by the assembler. */
157
158 static bfd_reloc_status_type
159 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
160 error_message)
161 bfd *abfd;
162 arelent *reloc_entry;
163 asymbol *symbol ATTRIBUTE_UNUSED;
164 PTR data;
165 asection *input_section ATTRIBUTE_UNUSED;
166 bfd *output_bfd;
167 char **error_message ATTRIBUTE_UNUSED;
168 {
169 symvalue diff;
170 if (output_bfd == (bfd *) NULL)
171 return bfd_reloc_continue;
172
173 diff = reloc_entry->addend;
174
175 #define DOIT(x) \
176 x = ((x & ~howto->dst_mask) \
177 | (((x & howto->src_mask) + diff) & howto->dst_mask))
178
179 if (diff != 0)
180 {
181 reloc_howto_type *howto = reloc_entry->howto;
182 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
183
184 switch (howto->size)
185 {
186 case 0:
187 {
188 char x = bfd_get_8 (abfd, addr);
189 DOIT (x);
190 bfd_put_8 (abfd, x, addr);
191 }
192 break;
193
194 case 1:
195 {
196 short x = bfd_get_16 (abfd, addr);
197 DOIT (x);
198 bfd_put_16 (abfd, (bfd_vma) x, addr);
199 }
200 break;
201
202 case 2:
203 {
204 long x = bfd_get_32 (abfd, addr);
205 DOIT (x);
206 bfd_put_32 (abfd, (bfd_vma) x, addr);
207 }
208 break;
209
210 default:
211 abort ();
212 }
213 }
214
215 /* Now let bfd_perform_relocation finish everything up. */
216 return bfd_reloc_continue;
217 }
218
219 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
220 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
221 should not. */
222 #ifndef TARGET_UNDERSCORE
223 #define TARGET_UNDERSCORE '_'
224 #endif
225
226 #ifndef PCRELOFFSET
227 #define PCRELOFFSET true
228 #endif
229
230 /* These most certainly belong somewhere else. Just had to get rid of
231 the manifest constants in the code. */
232 #define ARM_8 0
233 #define ARM_16 1
234 #define ARM_32 2
235 #define ARM_26 3
236 #define ARM_DISP8 4
237 #define ARM_DISP16 5
238 #define ARM_DISP32 6
239 #define ARM_26D 7
240 /* 8 is unused */
241 #define ARM_NEG16 9
242 #define ARM_NEG32 10
243 #define ARM_RVA32 11
244 #define ARM_THUMB9 12
245 #define ARM_THUMB12 13
246 #define ARM_THUMB23 14
247
248 #ifdef ARM_WINCE
249 #undef ARM_32
250 #undef ARM_RVA32
251 #undef ARM_26
252 #undef ARM_THUMB12
253 #undef ARM_26D
254
255 #define ARM_32 1
256 #define ARM_RVA32 2
257 #define ARM_26 3
258 #define ARM_THUMB12 4
259 #define ARM_26D 5
260 #define ARM_SECTION 14
261 #define ARM_SECREL 15
262 #endif
263
264 static reloc_howto_type aoutarm_std_reloc_howto[] =
265 {
266 #ifdef ARM_WINCE
267 EMPTY_HOWTO (-1),
268 HOWTO (ARM_32,
269 0,
270 2,
271 32,
272 false,
273 0,
274 complain_overflow_bitfield,
275 coff_arm_reloc,
276 "ARM_32",
277 true,
278 0xffffffff,
279 0xffffffff,
280 PCRELOFFSET),
281 HOWTO (ARM_RVA32,
282 0,
283 2,
284 32,
285 false,
286 0,
287 complain_overflow_bitfield,
288 coff_arm_reloc,
289 "ARM_RVA32",
290 true,
291 0xffffffff,
292 0xffffffff,
293 PCRELOFFSET),
294 HOWTO (ARM_26,
295 2,
296 2,
297 24,
298 true,
299 0,
300 complain_overflow_signed,
301 aoutarm_fix_pcrel_26 ,
302 "ARM_26",
303 false,
304 0x00ffffff,
305 0x00ffffff,
306 PCRELOFFSET),
307 HOWTO (ARM_THUMB12,
308 1,
309 1,
310 11,
311 true,
312 0,
313 complain_overflow_signed,
314 coff_thumb_pcrel_12 ,
315 "ARM_THUMB12",
316 false,
317 0x000007ff,
318 0x000007ff,
319 PCRELOFFSET),
320 HOWTO (ARM_26D,
321 2,
322 2,
323 24,
324 false,
325 0,
326 complain_overflow_dont,
327 aoutarm_fix_pcrel_26_done,
328 "ARM_26D",
329 true,
330 0x00ffffff,
331 0x0,
332 false),
333 EMPTY_HOWTO (-1),
334 EMPTY_HOWTO (-1),
335 EMPTY_HOWTO (-1),
336 EMPTY_HOWTO (-1),
337 EMPTY_HOWTO (-1),
338 EMPTY_HOWTO (-1),
339 EMPTY_HOWTO (-1),
340 EMPTY_HOWTO (-1),
341 HOWTO (ARM_SECTION,
342 0,
343 1,
344 16,
345 false,
346 0,
347 complain_overflow_bitfield,
348 coff_arm_reloc,
349 "ARM_16",
350 true,
351 0x0000ffff,
352 0x0000ffff,
353 PCRELOFFSET),
354 HOWTO (ARM_SECREL,
355 0,
356 2,
357 32,
358 false,
359 0,
360 complain_overflow_bitfield,
361 coff_arm_reloc,
362 "ARM_32",
363 true,
364 0xffffffff,
365 0xffffffff,
366 PCRELOFFSET),
367 #else /* not ARM_WINCE */
368 HOWTO (ARM_8, /* type */
369 0, /* rightshift */
370 0, /* size */
371 8, /* bitsize */
372 false, /* pc_relative */
373 0, /* bitpos */
374 complain_overflow_bitfield, /* complain_on_overflow */
375 coff_arm_reloc, /* special_function */
376 "ARM_8", /* name */
377 true, /* partial_inplace */
378 0x000000ff, /* src_mask */
379 0x000000ff, /* dst_mask */
380 PCRELOFFSET /* pcrel_offset */),
381 HOWTO (ARM_16,
382 0,
383 1,
384 16,
385 false,
386 0,
387 complain_overflow_bitfield,
388 coff_arm_reloc,
389 "ARM_16",
390 true,
391 0x0000ffff,
392 0x0000ffff,
393 PCRELOFFSET),
394 HOWTO (ARM_32,
395 0,
396 2,
397 32,
398 false,
399 0,
400 complain_overflow_bitfield,
401 coff_arm_reloc,
402 "ARM_32",
403 true,
404 0xffffffff,
405 0xffffffff,
406 PCRELOFFSET),
407 HOWTO (ARM_26,
408 2,
409 2,
410 24,
411 true,
412 0,
413 complain_overflow_signed,
414 aoutarm_fix_pcrel_26 ,
415 "ARM_26",
416 false,
417 0x00ffffff,
418 0x00ffffff,
419 PCRELOFFSET),
420 HOWTO (ARM_DISP8,
421 0,
422 0,
423 8,
424 true,
425 0,
426 complain_overflow_signed,
427 coff_arm_reloc,
428 "ARM_DISP8",
429 true,
430 0x000000ff,
431 0x000000ff,
432 true),
433 HOWTO (ARM_DISP16,
434 0,
435 1,
436 16,
437 true,
438 0,
439 complain_overflow_signed,
440 coff_arm_reloc,
441 "ARM_DISP16",
442 true,
443 0x0000ffff,
444 0x0000ffff,
445 true),
446 HOWTO (ARM_DISP32,
447 0,
448 2,
449 32,
450 true,
451 0,
452 complain_overflow_signed,
453 coff_arm_reloc,
454 "ARM_DISP32",
455 true,
456 0xffffffff,
457 0xffffffff,
458 true),
459 HOWTO (ARM_26D,
460 2,
461 2,
462 24,
463 false,
464 0,
465 complain_overflow_dont,
466 aoutarm_fix_pcrel_26_done,
467 "ARM_26D",
468 true,
469 0x00ffffff,
470 0x0,
471 false),
472 /* 8 is unused */
473 EMPTY_HOWTO (-1),
474 HOWTO (ARM_NEG16,
475 0,
476 -1,
477 16,
478 false,
479 0,
480 complain_overflow_bitfield,
481 coff_arm_reloc,
482 "ARM_NEG16",
483 true,
484 0x0000ffff,
485 0x0000ffff,
486 false),
487 HOWTO (ARM_NEG32,
488 0,
489 -2,
490 32,
491 false,
492 0,
493 complain_overflow_bitfield,
494 coff_arm_reloc,
495 "ARM_NEG32",
496 true,
497 0xffffffff,
498 0xffffffff,
499 false),
500 HOWTO (ARM_RVA32,
501 0,
502 2,
503 32,
504 false,
505 0,
506 complain_overflow_bitfield,
507 coff_arm_reloc,
508 "ARM_RVA32",
509 true,
510 0xffffffff,
511 0xffffffff,
512 PCRELOFFSET),
513 HOWTO (ARM_THUMB9,
514 1,
515 1,
516 8,
517 true,
518 0,
519 complain_overflow_signed,
520 coff_thumb_pcrel_9 ,
521 "ARM_THUMB9",
522 false,
523 0x000000ff,
524 0x000000ff,
525 PCRELOFFSET),
526 HOWTO (ARM_THUMB12,
527 1,
528 1,
529 11,
530 true,
531 0,
532 complain_overflow_signed,
533 coff_thumb_pcrel_12 ,
534 "ARM_THUMB12",
535 false,
536 0x000007ff,
537 0x000007ff,
538 PCRELOFFSET),
539 HOWTO (ARM_THUMB23,
540 1,
541 2,
542 22,
543 true,
544 0,
545 complain_overflow_signed,
546 coff_thumb_pcrel_23 ,
547 "ARM_THUMB23",
548 false,
549 0x07ff07ff,
550 0x07ff07ff,
551 PCRELOFFSET)
552 #endif /* not ARM_WINCE */
553 };
554
555 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
556
557 #ifdef COFF_WITH_PE
558 static boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
559 /* Return true if this relocation should
560 appear in the output .reloc section. */
561
562 static boolean
563 in_reloc_p (abfd, howto)
564 bfd * abfd ATTRIBUTE_UNUSED;
565 reloc_howto_type * howto;
566 {
567 return !howto->pc_relative && howto->type != ARM_RVA32;
568 }
569 #endif
570
571 #define RTYPE2HOWTO(cache_ptr, dst) \
572 (cache_ptr)->howto = \
573 (dst)->r_type < NUM_RELOCS \
574 ? aoutarm_std_reloc_howto + (dst)->r_type \
575 : NULL
576
577 #define coff_rtype_to_howto coff_arm_rtype_to_howto
578
579 static reloc_howto_type *
580 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
581 bfd *abfd ATTRIBUTE_UNUSED;
582 asection *sec;
583 struct internal_reloc *rel;
584 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
585 struct internal_syment *sym ATTRIBUTE_UNUSED;
586 bfd_vma *addendp;
587 {
588 reloc_howto_type * howto;
589
590 if (rel->r_type >= NUM_RELOCS)
591 return NULL;
592
593 howto = aoutarm_std_reloc_howto + rel->r_type;
594
595 if (rel->r_type == ARM_RVA32)
596 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
597
598 return howto;
599 }
600
601 /* Used by the assembler. */
602
603 static bfd_reloc_status_type
604 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
605 output_bfd, error_message)
606 bfd *abfd ATTRIBUTE_UNUSED;
607 arelent *reloc_entry ATTRIBUTE_UNUSED;
608 asymbol *symbol ATTRIBUTE_UNUSED;
609 PTR data ATTRIBUTE_UNUSED;
610 asection *input_section ATTRIBUTE_UNUSED;
611 bfd *output_bfd ATTRIBUTE_UNUSED;
612 char **error_message ATTRIBUTE_UNUSED;
613 {
614 /* This is dead simple at present. */
615 return bfd_reloc_ok;
616 }
617
618 /* Used by the assembler. */
619
620 static bfd_reloc_status_type
621 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
622 output_bfd, error_message)
623 bfd *abfd;
624 arelent *reloc_entry;
625 asymbol *symbol;
626 PTR data;
627 asection *input_section;
628 bfd *output_bfd;
629 char **error_message ATTRIBUTE_UNUSED;
630 {
631 bfd_vma relocation;
632 bfd_size_type addr = reloc_entry->address;
633 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
634 bfd_reloc_status_type flag = bfd_reloc_ok;
635
636 /* If this is an undefined symbol, return error. */
637 if (symbol->section == &bfd_und_section
638 && (symbol->flags & BSF_WEAK) == 0)
639 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
640
641 /* If the sections are different, and we are doing a partial relocation,
642 just ignore it for now. */
643 if (symbol->section->name != input_section->name
644 && output_bfd != (bfd *)NULL)
645 return bfd_reloc_continue;
646
647 relocation = (target & 0x00ffffff) << 2;
648 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
649 relocation += symbol->value;
650 relocation += symbol->section->output_section->vma;
651 relocation += symbol->section->output_offset;
652 relocation += reloc_entry->addend;
653 relocation -= input_section->output_section->vma;
654 relocation -= input_section->output_offset;
655 relocation -= addr;
656
657 if (relocation & 3)
658 return bfd_reloc_overflow;
659
660 /* Check for overflow. */
661 if (relocation & 0x02000000)
662 {
663 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
664 flag = bfd_reloc_overflow;
665 }
666 else if (relocation & ~(bfd_vma) 0x03ffffff)
667 flag = bfd_reloc_overflow;
668
669 target &= ~0x00ffffff;
670 target |= (relocation >> 2) & 0x00ffffff;
671 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
672
673 /* Now the ARM magic... Change the reloc type so that it is marked as done.
674 Strictly this is only necessary if we are doing a partial relocation. */
675 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
676
677 return flag;
678 }
679
680 static bfd_reloc_status_type
681 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
682 output_bfd, error_message, btype)
683 bfd *abfd;
684 arelent *reloc_entry;
685 asymbol *symbol;
686 PTR data;
687 asection *input_section;
688 bfd *output_bfd;
689 char **error_message ATTRIBUTE_UNUSED;
690 thumb_pcrel_branchtype btype;
691 {
692 bfd_vma relocation = 0;
693 bfd_size_type addr = reloc_entry->address;
694 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
695 bfd_reloc_status_type flag = bfd_reloc_ok;
696 bfd_vma dstmsk;
697 bfd_vma offmsk;
698 bfd_vma signbit;
699
700 /* NOTE: This routine is currently used by GAS, but not by the link
701 phase. */
702
703 switch (btype)
704 {
705 case b9:
706 dstmsk = 0x000000ff;
707 offmsk = 0x000001fe;
708 signbit = 0x00000100;
709 break;
710
711 case b12:
712 dstmsk = 0x000007ff;
713 offmsk = 0x00000ffe;
714 signbit = 0x00000800;
715 break;
716
717 case b23:
718 dstmsk = 0x07ff07ff;
719 offmsk = 0x007fffff;
720 signbit = 0x00400000;
721 break;
722
723 default:
724 abort ();
725 }
726
727 /* If this is an undefined symbol, return error. */
728 if (symbol->section == &bfd_und_section
729 && (symbol->flags & BSF_WEAK) == 0)
730 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
731
732 /* If the sections are different, and we are doing a partial relocation,
733 just ignore it for now. */
734 if (symbol->section->name != input_section->name
735 && output_bfd != (bfd *)NULL)
736 return bfd_reloc_continue;
737
738 switch (btype)
739 {
740 case b9:
741 case b12:
742 relocation = ((target & dstmsk) << 1);
743 break;
744
745 case b23:
746 if (bfd_big_endian (abfd))
747 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
748 else
749 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
750 break;
751
752 default:
753 abort ();
754 }
755
756 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
757 relocation += symbol->value;
758 relocation += symbol->section->output_section->vma;
759 relocation += symbol->section->output_offset;
760 relocation += reloc_entry->addend;
761 relocation -= input_section->output_section->vma;
762 relocation -= input_section->output_offset;
763 relocation -= addr;
764
765 if (relocation & 1)
766 return bfd_reloc_overflow;
767
768 /* Check for overflow. */
769 if (relocation & signbit)
770 {
771 if ((relocation & ~offmsk) != ~offmsk)
772 flag = bfd_reloc_overflow;
773 }
774 else if (relocation & ~offmsk)
775 flag = bfd_reloc_overflow;
776
777 target &= ~dstmsk;
778 switch (btype)
779 {
780 case b9:
781 case b12:
782 target |= (relocation >> 1);
783 break;
784
785 case b23:
786 if (bfd_big_endian (abfd))
787 target |= (((relocation & 0xfff) >> 1)
788 | ((relocation << 4) & 0x07ff0000));
789 else
790 target |= (((relocation & 0xffe) << 15)
791 | ((relocation >> 12) & 0x7ff));
792 break;
793
794 default:
795 abort ();
796 }
797
798 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
799
800 /* Now the ARM magic... Change the reloc type so that it is marked as done.
801 Strictly this is only necessary if we are doing a partial relocation. */
802 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
803
804 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
805 return flag;
806 }
807
808 #ifndef ARM_WINCE
809 static bfd_reloc_status_type
810 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
811 output_bfd, error_message)
812 bfd *abfd;
813 arelent *reloc_entry;
814 asymbol *symbol;
815 PTR data;
816 asection *input_section;
817 bfd *output_bfd;
818 char **error_message;
819 {
820 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
821 input_section, output_bfd, error_message,
822 b23);
823 }
824
825 static bfd_reloc_status_type
826 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
827 output_bfd, error_message)
828 bfd *abfd;
829 arelent *reloc_entry;
830 asymbol *symbol;
831 PTR data;
832 asection *input_section;
833 bfd *output_bfd;
834 char **error_message;
835 {
836 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
837 input_section, output_bfd, error_message,
838 b9);
839 }
840 #endif /* not ARM_WINCE */
841
842 static bfd_reloc_status_type
843 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
844 output_bfd, error_message)
845 bfd *abfd;
846 arelent *reloc_entry;
847 asymbol *symbol;
848 PTR data;
849 asection *input_section;
850 bfd *output_bfd;
851 char **error_message;
852 {
853 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
854 input_section, output_bfd, error_message,
855 b12);
856 }
857
858 static const struct reloc_howto_struct *
859 coff_arm_reloc_type_lookup (abfd, code)
860 bfd * abfd;
861 bfd_reloc_code_real_type code;
862 {
863 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
864
865 if (code == BFD_RELOC_CTOR)
866 switch (bfd_get_arch_info (abfd)->bits_per_address)
867 {
868 case 32:
869 code = BFD_RELOC_32;
870 break;
871 default:
872 return (const struct reloc_howto_struct *) 0;
873 }
874
875 switch (code)
876 {
877 #ifdef ARM_WINCE
878 ASTD (BFD_RELOC_32, ARM_32);
879 ASTD (BFD_RELOC_RVA, ARM_RVA32);
880 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
881 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
882 #else
883 ASTD (BFD_RELOC_8, ARM_8);
884 ASTD (BFD_RELOC_16, ARM_16);
885 ASTD (BFD_RELOC_32, ARM_32);
886 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
887 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
888 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
889 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
890 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
891 ASTD (BFD_RELOC_RVA, ARM_RVA32);
892 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
893 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
894 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
895 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
896 #endif
897 default: return (const struct reloc_howto_struct *) 0;
898 }
899 }
900
901 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
902 #define COFF_PAGE_SIZE 0x1000
903 /* Turn a howto into a reloc nunmber */
904
905 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
906 #define BADMAG(x) ARMBADMAG(x)
907 #define ARM 1 /* Customize coffcode.h */
908
909 #ifndef ARM_WINCE
910 /* Make sure that the 'r_offset' field is copied properly
911 so that identical binaries will compare the same. */
912 #define SWAP_IN_RELOC_OFFSET H_GET_32
913 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
914 #endif
915
916 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
917 This allows us to store global data here without actually creating any
918 global variables, which is a no-no in the BFD world. */
919 struct coff_arm_link_hash_table
920 {
921 /* The original coff_link_hash_table structure. MUST be first field. */
922 struct coff_link_hash_table root;
923
924 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
925 bfd_size_type thumb_glue_size;
926
927 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
928 bfd_size_type arm_glue_size;
929
930 /* An arbitary input BFD chosen to hold the glue sections. */
931 bfd * bfd_of_glue_owner;
932
933 /* Support interworking with old, non-interworking aware ARM code. */
934 int support_old_code;
935 };
936
937 /* Get the ARM coff linker hash table from a link_info structure. */
938 #define coff_arm_hash_table(info) \
939 ((struct coff_arm_link_hash_table *) ((info)->hash))
940
941 /* Create an ARM coff linker hash table. */
942
943 static struct bfd_link_hash_table *
944 coff_arm_link_hash_table_create (abfd)
945 bfd * abfd;
946 {
947 struct coff_arm_link_hash_table * ret;
948 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
949
950 ret = (struct coff_arm_link_hash_table *) bfd_malloc (amt);
951 if (ret == (struct coff_arm_link_hash_table *) NULL)
952 return NULL;
953
954 if (! _bfd_coff_link_hash_table_init
955 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
956 {
957 free (ret);
958 return (struct bfd_link_hash_table *) NULL;
959 }
960
961 ret->thumb_glue_size = 0;
962 ret->arm_glue_size = 0;
963 ret->bfd_of_glue_owner = NULL;
964
965 return & ret->root.root;
966 }
967
968 static void
969 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
970 struct bfd_link_info *info;
971 bfd *output_bfd;
972 asection *input_section;
973 bfd_vma reloc_offset;
974 {
975 bfd_vma addr = reloc_offset
976 - input_section->vma
977 + input_section->output_offset
978 + input_section->output_section->vma;
979
980 if (coff_data (output_bfd)->pe)
981 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
982 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
983
984 }
985 \f
986 #ifndef ARM_WINCE
987 /* The thumb form of a long branch is a bit finicky, because the offset
988 encoding is split over two fields, each in it's own instruction. They
989 can occur in any order. So given a thumb form of long branch, and an
990 offset, insert the offset into the thumb branch and return finished
991 instruction.
992
993 It takes two thumb instructions to encode the target address. Each has
994 11 bits to invest. The upper 11 bits are stored in one (identifed by
995 H-0.. see below), the lower 11 bits are stored in the other (identified
996 by H-1).
997
998 Combine together and shifted left by 1 (it's a half word address) and
999 there you have it.
1000
1001 Op: 1111 = F,
1002 H-0, upper address-0 = 000
1003 Op: 1111 = F,
1004 H-1, lower address-0 = 800
1005
1006 They can be ordered either way, but the arm tools I've seen always put
1007 the lower one first. It probably doesn't matter. krk@cygnus.com
1008
1009 XXX: Actually the order does matter. The second instruction (H-1)
1010 moves the computed address into the PC, so it must be the second one
1011 in the sequence. The problem, however is that whilst little endian code
1012 stores the instructions in HI then LOW order, big endian code does the
1013 reverse. nickc@cygnus.com. */
1014
1015 #define LOW_HI_ORDER 0xF800F000
1016 #define HI_LOW_ORDER 0xF000F800
1017
1018 static insn32
1019 insert_thumb_branch (br_insn, rel_off)
1020 insn32 br_insn;
1021 int rel_off;
1022 {
1023 unsigned int low_bits;
1024 unsigned int high_bits;
1025
1026 BFD_ASSERT((rel_off & 1) != 1);
1027
1028 rel_off >>= 1; /* half word aligned address */
1029 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
1030 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
1031
1032 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1033 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1034 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1035 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1036 else
1037 /* FIXME: the BFD library should never abort except for internal errors
1038 - it should return an error status. */
1039 abort (); /* Error - not a valid branch instruction form. */
1040
1041 return br_insn;
1042 }
1043
1044 \f
1045 static struct coff_link_hash_entry *
1046 find_thumb_glue (info, name, input_bfd)
1047 struct bfd_link_info *info;
1048 const char *name;
1049 bfd *input_bfd;
1050 {
1051 char *tmp_name;
1052 struct coff_link_hash_entry *myh;
1053 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1054
1055 tmp_name = (char *) bfd_malloc (amt);
1056
1057 BFD_ASSERT (tmp_name);
1058
1059 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1060
1061 myh = coff_link_hash_lookup
1062 (coff_hash_table (info), tmp_name, false, false, true);
1063
1064 if (myh == NULL)
1065 /* xgettext:c-format */
1066 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1067 bfd_archive_filename (input_bfd), tmp_name, name);
1068
1069 free (tmp_name);
1070
1071 return myh;
1072 }
1073 #endif /* not ARM_WINCE */
1074
1075 static struct coff_link_hash_entry *
1076 find_arm_glue (info, name, input_bfd)
1077 struct bfd_link_info *info;
1078 const char *name;
1079 bfd *input_bfd;
1080 {
1081 char *tmp_name;
1082 struct coff_link_hash_entry * myh;
1083 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1084
1085 tmp_name = (char *) bfd_malloc (amt);
1086
1087 BFD_ASSERT (tmp_name);
1088
1089 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1090
1091 myh = coff_link_hash_lookup
1092 (coff_hash_table (info), tmp_name, false, false, true);
1093
1094 if (myh == NULL)
1095 /* xgettext:c-format */
1096 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1097 bfd_archive_filename (input_bfd), tmp_name, name);
1098
1099 free (tmp_name);
1100
1101 return myh;
1102 }
1103
1104 /*
1105 ARM->Thumb glue:
1106
1107 .arm
1108 __func_from_arm:
1109 ldr r12, __func_addr
1110 bx r12
1111 __func_addr:
1112 .word func @ behave as if you saw a ARM_32 reloc
1113 */
1114
1115 #define ARM2THUMB_GLUE_SIZE 12
1116 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1117 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1118 static const insn32 a2t3_func_addr_insn = 0x00000001;
1119
1120 /*
1121 Thumb->ARM: Thumb->(non-interworking aware) ARM
1122
1123 .thumb .thumb
1124 .align 2 .align 2
1125 __func_from_thumb: __func_from_thumb:
1126 bx pc push {r6, lr}
1127 nop ldr r6, __func_addr
1128 .arm mov lr, pc
1129 __func_change_to_arm: bx r6
1130 b func .arm
1131 __func_back_to_thumb:
1132 ldmia r13! {r6, lr}
1133 bx lr
1134 __func_addr:
1135 .word func
1136 */
1137
1138 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1139 static const insn16 t2a1_bx_pc_insn = 0x4778;
1140 static const insn16 t2a2_noop_insn = 0x46c0;
1141 static const insn32 t2a3_b_insn = 0xea000000;
1142
1143 static const insn16 t2a1_push_insn = 0xb540;
1144 static const insn16 t2a2_ldr_insn = 0x4e03;
1145 static const insn16 t2a3_mov_insn = 0x46fe;
1146 static const insn16 t2a4_bx_insn = 0x4730;
1147 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1148 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1149
1150 /* TODO:
1151 We should really create new local (static) symbols in destination
1152 object for each stub we create. We should also create local
1153 (static) symbols within the stubs when switching between ARM and
1154 Thumb code. This will ensure that the debugger and disassembler
1155 can present a better view of stubs.
1156
1157 We can treat stubs like literal sections, and for the THUMB9 ones
1158 (short addressing range) we should be able to insert the stubs
1159 between sections. i.e. the simplest approach (since relocations
1160 are done on a section basis) is to dump the stubs at the end of
1161 processing a section. That way we can always try and minimise the
1162 offset to and from a stub. However, this does not map well onto
1163 the way that the linker/BFD does its work: mapping all input
1164 sections to output sections via the linker script before doing
1165 all the processing.
1166
1167 Unfortunately it may be easier to just to disallow short range
1168 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1169 only branch-and-link (BL) calls. This will simplify the processing
1170 since we can then put all of the stubs into their own section.
1171
1172 TODO:
1173 On a different subject, rather than complaining when a
1174 branch cannot fit in the number of bits available for the
1175 instruction we should generate a trampoline stub (needed to
1176 address the complete 32bit address space). */
1177
1178 /* The standard COFF backend linker does not cope with the special
1179 Thumb BRANCH23 relocation. The alternative would be to split the
1180 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1181 bit simpler simply providing our own relocation driver. */
1182
1183 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1184 This code is a very slightly modified copy of
1185 _bfd_coff_generic_relocate_section. It would be a much more
1186 maintainable solution to have a MACRO that could be expanded within
1187 _bfd_coff_generic_relocate_section that would only be provided for
1188 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1189 is different from the original. */
1190
1191 static boolean
1192 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1193 contents, relocs, syms, sections)
1194 bfd *output_bfd;
1195 struct bfd_link_info *info;
1196 bfd *input_bfd;
1197 asection *input_section;
1198 bfd_byte *contents;
1199 struct internal_reloc *relocs;
1200 struct internal_syment *syms;
1201 asection **sections;
1202 {
1203 struct internal_reloc * rel;
1204 struct internal_reloc * relend;
1205
1206 rel = relocs;
1207 relend = rel + input_section->reloc_count;
1208
1209 for (; rel < relend; rel++)
1210 {
1211 int done = 0;
1212 long symndx;
1213 struct coff_link_hash_entry * h;
1214 struct internal_syment * sym;
1215 bfd_vma addend;
1216 bfd_vma val;
1217 reloc_howto_type * howto;
1218 bfd_reloc_status_type rstat;
1219 bfd_vma h_val;
1220
1221 symndx = rel->r_symndx;
1222
1223 if (symndx == -1)
1224 {
1225 h = NULL;
1226 sym = NULL;
1227 }
1228 else
1229 {
1230 h = obj_coff_sym_hashes (input_bfd)[symndx];
1231 sym = syms + symndx;
1232 }
1233
1234 /* COFF treats common symbols in one of two ways. Either the
1235 size of the symbol is included in the section contents, or it
1236 is not. We assume that the size is not included, and force
1237 the rtype_to_howto function to adjust the addend as needed. */
1238
1239 if (sym != NULL && sym->n_scnum != 0)
1240 addend = - sym->n_value;
1241 else
1242 addend = 0;
1243
1244 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1245 sym, &addend);
1246 if (howto == NULL)
1247 return false;
1248
1249 /* The relocation_section function will skip pcrel_offset relocs
1250 when doing a relocateable link. However, we want to convert
1251 ARM26 to ARM26D relocs if possible. We return a fake howto in
1252 this case without pcrel_offset set, and adjust the addend to
1253 compensate. */
1254 if (rel->r_type == ARM_26
1255 && h != NULL
1256 && info->relocateable
1257 && (h->root.type == bfd_link_hash_defined
1258 || h->root.type == bfd_link_hash_defweak)
1259 && (h->root.u.def.section->output_section
1260 == input_section->output_section))
1261 {
1262 static reloc_howto_type fake_arm26_reloc =
1263 HOWTO (ARM_26,
1264 2,
1265 2,
1266 24,
1267 true,
1268 0,
1269 complain_overflow_signed,
1270 aoutarm_fix_pcrel_26 ,
1271 "ARM_26",
1272 false,
1273 0x00ffffff,
1274 0x00ffffff,
1275 false);
1276
1277 addend -= rel->r_vaddr - input_section->vma;
1278 howto = &fake_arm26_reloc;
1279 }
1280
1281 #ifdef ARM_WINCE
1282 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1283 the next opcode's pc, so is off by one. */
1284 if (howto->pc_relative && !info->relocateable)
1285 addend -= 8;
1286 #endif
1287
1288 /* If we are doing a relocateable link, then we can just ignore
1289 a PC relative reloc that is pcrel_offset. It will already
1290 have the correct value. If this is not a relocateable link,
1291 then we should ignore the symbol value. */
1292 if (howto->pc_relative && howto->pcrel_offset)
1293 {
1294 if (info->relocateable)
1295 continue;
1296 /* FIXME - it is not clear which targets need this next test
1297 and which do not. It is known that it is needed for the
1298 VxWorks and EPOC-PE targets, but it is also known that it
1299 was supressed for other ARM targets. This ought to be
1300 sorted out one day. */
1301 #ifdef ARM_COFF_BUGFIX
1302 /* We must not ignore the symbol value. If the symbol is
1303 within the same section, the relocation should have already
1304 been fixed, but if it is not, we'll be handed a reloc into
1305 the beginning of the symbol's section, so we must not cancel
1306 out the symbol's value, otherwise we'll be adding it in
1307 twice. */
1308 if (sym != NULL && sym->n_scnum != 0)
1309 addend += sym->n_value;
1310 #endif
1311 }
1312
1313 val = 0;
1314
1315 if (h == NULL)
1316 {
1317 asection *sec;
1318
1319 if (symndx == -1)
1320 {
1321 sec = bfd_abs_section_ptr;
1322 val = 0;
1323 }
1324 else
1325 {
1326 sec = sections[symndx];
1327 val = (sec->output_section->vma
1328 + sec->output_offset
1329 + sym->n_value
1330 - sec->vma);
1331 }
1332 }
1333 else
1334 {
1335 #if 1 /* THUMBEXTENSION */
1336 /* We don't output the stubs if we are generating a
1337 relocatable output file, since we may as well leave the
1338 stub generation to the final linker pass. If we fail to
1339 verify that the name is defined, we'll try to build stubs
1340 for an undefined name... */
1341 if (! info->relocateable
1342 && ( h->root.type == bfd_link_hash_defined
1343 || h->root.type == bfd_link_hash_defweak))
1344 {
1345 asection * h_sec = h->root.u.def.section;
1346 const char * name = h->root.root.string;
1347
1348 /* h locates the symbol referenced in the reloc. */
1349 h_val = (h->root.u.def.value
1350 + h_sec->output_section->vma
1351 + h_sec->output_offset);
1352
1353 if (howto->type == ARM_26)
1354 {
1355 if ( h->class == C_THUMBSTATFUNC
1356 || h->class == C_THUMBEXTFUNC)
1357 {
1358 /* Arm code calling a Thumb function. */
1359 unsigned long int tmp;
1360 bfd_vma my_offset;
1361 asection * s;
1362 long int ret_offset;
1363 struct coff_link_hash_entry * myh;
1364 struct coff_arm_link_hash_table * globals;
1365
1366 myh = find_arm_glue (info, name, input_bfd);
1367 if (myh == NULL)
1368 return false;
1369
1370 globals = coff_arm_hash_table (info);
1371
1372 BFD_ASSERT (globals != NULL);
1373 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1374
1375 my_offset = myh->root.u.def.value;
1376
1377 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1378 ARM2THUMB_GLUE_SECTION_NAME);
1379 BFD_ASSERT (s != NULL);
1380 BFD_ASSERT (s->contents != NULL);
1381 BFD_ASSERT (s->output_section != NULL);
1382
1383 if ((my_offset & 0x01) == 0x01)
1384 {
1385 if (h_sec->owner != NULL
1386 && INTERWORK_SET (h_sec->owner)
1387 && ! INTERWORK_FLAG (h_sec->owner))
1388 {
1389 _bfd_error_handler
1390 /* xgettext:c-format */
1391 (_("%s(%s): warning: interworking not enabled."),
1392 bfd_archive_filename (h_sec->owner), name);
1393 _bfd_error_handler
1394 /* xgettext:c-format */
1395 (_(" first occurrence: %s: arm call to thumb"),
1396 bfd_archive_filename (input_bfd));
1397 }
1398
1399 --my_offset;
1400 myh->root.u.def.value = my_offset;
1401
1402 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1403 s->contents + my_offset);
1404
1405 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1406 s->contents + my_offset + 4);
1407
1408 /* It's a thumb address. Add the low order bit. */
1409 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1410 s->contents + my_offset + 8);
1411
1412 if (info->base_file)
1413 arm_emit_base_file_entry (info, output_bfd, s,
1414 my_offset + 8);
1415
1416 }
1417
1418 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1419
1420 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1421 - input_section->vma);
1422
1423 tmp = tmp & 0xFF000000;
1424
1425 /* Somehow these are both 4 too far, so subtract 8. */
1426 ret_offset =
1427 s->output_offset
1428 + my_offset
1429 + s->output_section->vma
1430 - (input_section->output_offset
1431 + input_section->output_section->vma
1432 + rel->r_vaddr)
1433 - 8;
1434
1435 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1436
1437 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1438 contents + rel->r_vaddr - input_section->vma);
1439 done = 1;
1440 }
1441 }
1442
1443 #ifndef ARM_WINCE
1444 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1445 else if (howto->type == ARM_THUMB23)
1446 {
1447 if ( h->class == C_EXT
1448 || h->class == C_STAT
1449 || h->class == C_LABEL)
1450 {
1451 /* Thumb code calling an ARM function */
1452 asection * s = 0;
1453 bfd_vma my_offset;
1454 unsigned long int tmp;
1455 long int ret_offset;
1456 struct coff_link_hash_entry * myh;
1457 struct coff_arm_link_hash_table * globals;
1458
1459 myh = find_thumb_glue (info, name, input_bfd);
1460 if (myh == NULL)
1461 return false;
1462
1463 globals = coff_arm_hash_table (info);
1464
1465 BFD_ASSERT (globals != NULL);
1466 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1467
1468 my_offset = myh->root.u.def.value;
1469
1470 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1471 THUMB2ARM_GLUE_SECTION_NAME);
1472
1473 BFD_ASSERT (s != NULL);
1474 BFD_ASSERT (s->contents != NULL);
1475 BFD_ASSERT (s->output_section != NULL);
1476
1477 if ((my_offset & 0x01) == 0x01)
1478 {
1479 if (h_sec->owner != NULL
1480 && INTERWORK_SET (h_sec->owner)
1481 && ! INTERWORK_FLAG (h_sec->owner)
1482 && ! globals->support_old_code)
1483 {
1484 _bfd_error_handler
1485 /* xgettext:c-format */
1486 (_("%s(%s): warning: interworking not enabled."),
1487 bfd_archive_filename (h_sec->owner), name);
1488 _bfd_error_handler
1489 /* xgettext:c-format */
1490 (_(" first occurrence: %s: thumb call to arm"),
1491 bfd_archive_filename (input_bfd));
1492 _bfd_error_handler
1493 (_(" consider relinking with --support-old-code enabled"));
1494 }
1495
1496 -- my_offset;
1497 myh->root.u.def.value = my_offset;
1498
1499 if (globals->support_old_code)
1500 {
1501 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1502 s->contents + my_offset);
1503
1504 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1505 s->contents + my_offset + 2);
1506
1507 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1508 s->contents + my_offset + 4);
1509
1510 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1511 s->contents + my_offset + 6);
1512
1513 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1514 s->contents + my_offset + 8);
1515
1516 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1517 s->contents + my_offset + 12);
1518
1519 /* Store the address of the function in the last word of the stub. */
1520 bfd_put_32 (output_bfd, h_val,
1521 s->contents + my_offset + 16);
1522
1523 if (info->base_file)
1524 arm_emit_base_file_entry (info, output_bfd, s,
1525 my_offset + 16);
1526 }
1527 else
1528 {
1529 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1530 s->contents + my_offset);
1531
1532 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1533 s->contents + my_offset + 2);
1534
1535 ret_offset =
1536 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1537 - ((bfd_signed_vma)
1538 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1539 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1540 + s->output_section->vma) /* Address of the start of the current section. */
1541 + 4 /* The branch instruction is 4 bytes into the stub. */
1542 + 8); /* ARM branches work from the pc of the instruction + 8. */
1543
1544 bfd_put_32 (output_bfd,
1545 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1546 s->contents + my_offset + 4);
1547
1548 }
1549 }
1550
1551 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1552
1553 /* Now go back and fix up the original BL insn to point
1554 to here. */
1555 ret_offset =
1556 s->output_offset
1557 + my_offset
1558 - (input_section->output_offset
1559 + rel->r_vaddr)
1560 -4;
1561
1562 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1563 - input_section->vma);
1564
1565 bfd_put_32 (output_bfd,
1566 (bfd_vma) insert_thumb_branch (tmp,
1567 ret_offset),
1568 contents + rel->r_vaddr - input_section->vma);
1569
1570 done = 1;
1571 }
1572 }
1573 #endif
1574 }
1575
1576 /* If the relocation type and destination symbol does not
1577 fall into one of the above categories, then we can just
1578 perform a direct link. */
1579
1580 if (done)
1581 rstat = bfd_reloc_ok;
1582 else
1583 #endif /* THUMBEXTENSION */
1584 if ( h->root.type == bfd_link_hash_defined
1585 || h->root.type == bfd_link_hash_defweak)
1586 {
1587 asection *sec;
1588
1589 sec = h->root.u.def.section;
1590 val = (h->root.u.def.value
1591 + sec->output_section->vma
1592 + sec->output_offset);
1593 }
1594
1595 else if (! info->relocateable)
1596 {
1597 if (! ((*info->callbacks->undefined_symbol)
1598 (info, h->root.root.string, input_bfd, input_section,
1599 rel->r_vaddr - input_section->vma, true)))
1600 return false;
1601 }
1602 }
1603
1604 if (info->base_file)
1605 {
1606 /* Emit a reloc if the backend thinks it needs it. */
1607 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1608 arm_emit_base_file_entry (info, output_bfd, input_section,
1609 rel->r_vaddr);
1610 }
1611
1612 #if 1 /* THUMBEXTENSION */
1613 if (done)
1614 rstat = bfd_reloc_ok;
1615 #ifndef ARM_WINCE
1616 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1617 else if (! info->relocateable
1618 && howto->type == ARM_THUMB23)
1619 {
1620 /* This is pretty much a copy of what the default
1621 _bfd_final_link_relocate and _bfd_relocate_contents
1622 routines do to perform a relocation, with special
1623 processing for the split addressing of the Thumb BL
1624 instruction. Again, it would probably be simpler adding a
1625 ThumbBRANCH23 specific macro expansion into the default
1626 code. */
1627
1628 bfd_vma address = rel->r_vaddr - input_section->vma;
1629
1630 if (address > input_section->_raw_size)
1631 rstat = bfd_reloc_outofrange;
1632 else
1633 {
1634 bfd_vma relocation = val + addend;
1635 int size = bfd_get_reloc_size (howto);
1636 boolean overflow = false;
1637 bfd_byte * location = contents + address;
1638 bfd_vma x = bfd_get_32 (input_bfd, location);
1639 bfd_vma src_mask = 0x007FFFFE;
1640 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1641 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1642 bfd_vma check;
1643 bfd_signed_vma signed_check;
1644 bfd_vma add;
1645 bfd_signed_vma signed_add;
1646
1647 BFD_ASSERT (size == 4);
1648
1649 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1650 relocation -= (input_section->output_section->vma
1651 + input_section->output_offset);
1652
1653 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1654 relocation -= address;
1655
1656 /* No need to negate the relocation with BRANCH23. */
1657 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1658 /* howto->rightshift == 1 */
1659
1660 /* Drop unwanted bits from the value we are relocating to. */
1661 check = relocation >> howto->rightshift;
1662
1663 /* If this is a signed value, the rightshift just dropped
1664 leading 1 bits (assuming twos complement). */
1665 if ((bfd_signed_vma) relocation >= 0)
1666 signed_check = check;
1667 else
1668 signed_check = (check
1669 | ((bfd_vma) - 1
1670 & ~((bfd_vma) - 1 >> howto->rightshift)));
1671
1672 /* Get the value from the object file. */
1673 if (bfd_big_endian (input_bfd))
1674 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1675 else
1676 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1677
1678 /* Get the value from the object file with an appropriate sign.
1679 The expression involving howto->src_mask isolates the upper
1680 bit of src_mask. If that bit is set in the value we are
1681 adding, it is negative, and we subtract out that number times
1682 two. If src_mask includes the highest possible bit, then we
1683 can not get the upper bit, but that does not matter since
1684 signed_add needs no adjustment to become negative in that
1685 case. */
1686 signed_add = add;
1687
1688 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1689 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1690
1691 /* howto->bitpos == 0 */
1692 /* Add the value from the object file, shifted so that it is a
1693 straight number. */
1694 signed_check += signed_add;
1695 relocation += signed_add;
1696
1697 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1698
1699 /* Assumes two's complement. */
1700 if ( signed_check > reloc_signed_max
1701 || signed_check < reloc_signed_min)
1702 overflow = true;
1703
1704 /* Put the relocation into the correct bits.
1705 For a BLX instruction, make sure that the relocation is rounded up
1706 to a word boundary. This follows the semantics of the instruction
1707 which specifies that bit 1 of the target address will come from bit
1708 1 of the base address. */
1709 if (bfd_big_endian (input_bfd))
1710 {
1711 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1712 relocation += 2;
1713 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1714 }
1715 else
1716 {
1717 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1718 relocation += 2;
1719 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1720 }
1721
1722 /* Add the relocation to the correct bits of X. */
1723 x = ((x & ~howto->dst_mask) | relocation);
1724
1725 /* Put the relocated value back in the object file. */
1726 bfd_put_32 (input_bfd, x, location);
1727
1728 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1729 }
1730 }
1731 #endif
1732 else
1733 #endif /* THUMBEXTENSION */
1734 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1735 contents,
1736 rel->r_vaddr - input_section->vma,
1737 val, addend);
1738 #if 1 /* THUMBEXTENSION */
1739 /* FIXME:
1740 Is this the best way to fix up thumb addresses? krk@cygnus.com
1741 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1742 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1743 if (! info->relocateable
1744 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1745 {
1746 /* Determine if we need to set the bottom bit of a relocated address
1747 because the address is the address of a Thumb code symbol. */
1748
1749 int patchit = false;
1750
1751 if (h != NULL
1752 && ( h->class == C_THUMBSTATFUNC
1753 || h->class == C_THUMBEXTFUNC))
1754 {
1755 patchit = true;
1756 }
1757 else if (sym != NULL
1758 && sym->n_scnum > N_UNDEF)
1759 {
1760 /* No hash entry - use the symbol instead. */
1761
1762 if ( sym->n_sclass == C_THUMBSTATFUNC
1763 || sym->n_sclass == C_THUMBEXTFUNC)
1764 patchit = true;
1765 }
1766
1767 if (patchit)
1768 {
1769 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1770 bfd_vma x = bfd_get_32 (input_bfd, location);
1771
1772 bfd_put_32 (input_bfd, x | 1, location);
1773 }
1774 }
1775 #endif /* THUMBEXTENSION */
1776
1777 switch (rstat)
1778 {
1779 default:
1780 abort ();
1781 case bfd_reloc_ok:
1782 break;
1783 case bfd_reloc_outofrange:
1784 (*_bfd_error_handler)
1785 (_("%s: bad reloc address 0x%lx in section `%s'"),
1786 bfd_archive_filename (input_bfd),
1787 (unsigned long) rel->r_vaddr,
1788 bfd_get_section_name (input_bfd, input_section));
1789 return false;
1790 case bfd_reloc_overflow:
1791 {
1792 const char *name;
1793 char buf[SYMNMLEN + 1];
1794
1795 if (symndx == -1)
1796 name = "*ABS*";
1797 else if (h != NULL)
1798 name = h->root.root.string;
1799 else
1800 {
1801 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1802 if (name == NULL)
1803 return false;
1804 }
1805
1806 if (! ((*info->callbacks->reloc_overflow)
1807 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1808 input_section, rel->r_vaddr - input_section->vma)))
1809 return false;
1810 }
1811 }
1812 }
1813
1814 return true;
1815 }
1816
1817 #ifndef COFF_IMAGE_WITH_PE
1818
1819 boolean
1820 bfd_arm_allocate_interworking_sections (info)
1821 struct bfd_link_info * info;
1822 {
1823 asection * s;
1824 bfd_byte * foo;
1825 struct coff_arm_link_hash_table * globals;
1826 #if 0
1827 static char test_char = '1';
1828 #endif
1829
1830 globals = coff_arm_hash_table (info);
1831
1832 BFD_ASSERT (globals != NULL);
1833
1834 if (globals->arm_glue_size != 0)
1835 {
1836 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1837
1838 s = bfd_get_section_by_name
1839 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1840
1841 BFD_ASSERT (s != NULL);
1842
1843 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1844 globals->arm_glue_size);
1845 #if 0
1846 memset (foo, test_char, (size_t) globals->arm_glue_size);
1847 #endif
1848
1849 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1850 s->contents = foo;
1851 }
1852
1853 if (globals->thumb_glue_size != 0)
1854 {
1855 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1856
1857 s = bfd_get_section_by_name
1858 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1859
1860 BFD_ASSERT (s != NULL);
1861
1862 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1863 globals->thumb_glue_size);
1864 #if 0
1865 memset (foo, test_char, (size_t) globals->thumb_glue_size);
1866 #endif
1867
1868 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1869 s->contents = foo;
1870 }
1871
1872 return true;
1873 }
1874
1875 static void
1876 record_arm_to_thumb_glue (info, h)
1877 struct bfd_link_info * info;
1878 struct coff_link_hash_entry * h;
1879 {
1880 const char * name = h->root.root.string;
1881 register asection * s;
1882 char * tmp_name;
1883 struct coff_link_hash_entry * myh;
1884 struct coff_arm_link_hash_table * globals;
1885 bfd_vma val;
1886 bfd_size_type amt;
1887
1888 globals = coff_arm_hash_table (info);
1889
1890 BFD_ASSERT (globals != NULL);
1891 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1892
1893 s = bfd_get_section_by_name
1894 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1895
1896 BFD_ASSERT (s != NULL);
1897
1898 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1899 tmp_name = (char *) bfd_malloc (amt);
1900
1901 BFD_ASSERT (tmp_name);
1902
1903 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1904
1905 myh = coff_link_hash_lookup
1906 (coff_hash_table (info), tmp_name, false, false, true);
1907
1908 if (myh != NULL)
1909 {
1910 free (tmp_name);
1911 return; /* we've already seen this guy */
1912 }
1913
1914 /* The only trick here is using globals->arm_glue_size as the value. Even
1915 though the section isn't allocated yet, this is where we will be putting
1916 it. */
1917
1918 val = globals->arm_glue_size + 1;
1919 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1920 BSF_GLOBAL, s, val, NULL, true, false,
1921 (struct bfd_link_hash_entry **) & myh);
1922
1923 free (tmp_name);
1924
1925 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1926
1927 return;
1928 }
1929
1930 #ifndef ARM_WINCE
1931 static void
1932 record_thumb_to_arm_glue (info, h)
1933 struct bfd_link_info * info;
1934 struct coff_link_hash_entry * h;
1935 {
1936 const char * name = h->root.root.string;
1937 register asection * s;
1938 char * tmp_name;
1939 struct coff_link_hash_entry * myh;
1940 struct coff_arm_link_hash_table * globals;
1941 bfd_vma val;
1942 bfd_size_type amt;
1943
1944 globals = coff_arm_hash_table (info);
1945
1946 BFD_ASSERT (globals != NULL);
1947 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1948
1949 s = bfd_get_section_by_name
1950 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1951
1952 BFD_ASSERT (s != NULL);
1953
1954 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1955 tmp_name = (char *) bfd_malloc (amt);
1956
1957 BFD_ASSERT (tmp_name);
1958
1959 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1960
1961 myh = coff_link_hash_lookup
1962 (coff_hash_table (info), tmp_name, false, false, true);
1963
1964 if (myh != NULL)
1965 {
1966 free (tmp_name);
1967 return; /* we've already seen this guy */
1968 }
1969
1970 val = globals->thumb_glue_size + 1;
1971 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1972 BSF_GLOBAL, s, val, NULL, true, false,
1973 (struct bfd_link_hash_entry **) &myh);
1974
1975 /* If we mark it 'thumb', the disassembler will do a better job. */
1976 myh->class = C_THUMBEXTFUNC;
1977
1978 free (tmp_name);
1979
1980 /* Allocate another symbol to mark where we switch to arm mode. */
1981
1982 #define CHANGE_TO_ARM "__%s_change_to_arm"
1983 #define BACK_FROM_ARM "__%s_back_from_arm"
1984
1985 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1986 tmp_name = (char *) bfd_malloc (amt);
1987
1988 BFD_ASSERT (tmp_name);
1989
1990 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1991
1992 myh = NULL;
1993 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1994 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1995 BSF_LOCAL, s, val, NULL, true, false,
1996 (struct bfd_link_hash_entry **) & myh);
1997
1998 free (tmp_name);
1999
2000 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
2001
2002 return;
2003 }
2004 #endif /* not ARM_WINCE */
2005
2006 /* Select a BFD to be used to hold the sections used by the glue code.
2007 This function is called from the linker scripts in ld/emultempl/
2008 {armcoff/pe}.em */
2009
2010 boolean
2011 bfd_arm_get_bfd_for_interworking (abfd, info)
2012 bfd * abfd;
2013 struct bfd_link_info * info;
2014 {
2015 struct coff_arm_link_hash_table * globals;
2016 flagword flags;
2017 asection * sec;
2018
2019 /* If we are only performing a partial link do not bother
2020 getting a bfd to hold the glue. */
2021 if (info->relocateable)
2022 return true;
2023
2024 globals = coff_arm_hash_table (info);
2025
2026 BFD_ASSERT (globals != NULL);
2027
2028 if (globals->bfd_of_glue_owner != NULL)
2029 return true;
2030
2031 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2032
2033 if (sec == NULL)
2034 {
2035 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2036
2037 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2038
2039 if (sec == NULL
2040 || ! bfd_set_section_flags (abfd, sec, flags)
2041 || ! bfd_set_section_alignment (abfd, sec, 2))
2042 return false;
2043 }
2044
2045 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2046
2047 if (sec == NULL)
2048 {
2049 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2050
2051 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2052
2053 if (sec == NULL
2054 || ! bfd_set_section_flags (abfd, sec, flags)
2055 || ! bfd_set_section_alignment (abfd, sec, 2))
2056 return false;
2057 }
2058
2059 /* Save the bfd for later use. */
2060 globals->bfd_of_glue_owner = abfd;
2061
2062 return true;
2063 }
2064
2065 boolean
2066 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2067 bfd * abfd;
2068 struct bfd_link_info * info;
2069 int support_old_code;
2070 {
2071 asection * sec;
2072 struct coff_arm_link_hash_table * globals;
2073
2074 /* If we are only performing a partial link do not bother
2075 to construct any glue. */
2076 if (info->relocateable)
2077 return true;
2078
2079 /* Here we have a bfd that is to be included on the link. We have a hook
2080 to do reloc rummaging, before section sizes are nailed down. */
2081
2082 _bfd_coff_get_external_symbols (abfd);
2083
2084 globals = coff_arm_hash_table (info);
2085
2086 BFD_ASSERT (globals != NULL);
2087 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2088
2089 globals->support_old_code = support_old_code;
2090
2091 /* Rummage around all the relocs and map the glue vectors. */
2092 sec = abfd->sections;
2093
2094 if (sec == NULL)
2095 return true;
2096
2097 for (; sec != NULL; sec = sec->next)
2098 {
2099 struct internal_reloc * i;
2100 struct internal_reloc * rel;
2101
2102 if (sec->reloc_count == 0)
2103 continue;
2104
2105 /* Load the relocs. */
2106 /* FIXME: there may be a storage leak here. */
2107
2108 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2109
2110 BFD_ASSERT (i != 0);
2111
2112 for (rel = i; rel < i + sec->reloc_count; ++rel)
2113 {
2114 unsigned short r_type = rel->r_type;
2115 long symndx;
2116 struct coff_link_hash_entry * h;
2117
2118 symndx = rel->r_symndx;
2119
2120 /* If the relocation is not against a symbol it cannot concern us. */
2121 if (symndx == -1)
2122 continue;
2123
2124 /* If the index is outside of the range of our table, something has gone wrong. */
2125 if (symndx >= obj_conv_table_size (abfd))
2126 {
2127 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2128 bfd_archive_filename (abfd), symndx);
2129 continue;
2130 }
2131
2132 h = obj_coff_sym_hashes (abfd)[symndx];
2133
2134 /* If the relocation is against a static symbol it must be within
2135 the current section and so cannot be a cross ARM/Thumb relocation. */
2136 if (h == NULL)
2137 continue;
2138
2139 switch (r_type)
2140 {
2141 case ARM_26:
2142 /* This one is a call from arm code. We need to look up
2143 the target of the call. If it is a thumb target, we
2144 insert glue. */
2145
2146 if (h->class == C_THUMBEXTFUNC)
2147 record_arm_to_thumb_glue (info, h);
2148 break;
2149
2150 #ifndef ARM_WINCE
2151 case ARM_THUMB23:
2152 /* This one is a call from thumb code. We used to look
2153 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2154 up the target of the call. If it is an arm target, we
2155 insert glue. If the symbol does not exist it will be
2156 given a class of C_EXT and so we will generate a stub
2157 for it. This is not really a problem, since the link
2158 is doomed anyway. */
2159
2160 switch (h->class)
2161 {
2162 case C_EXT:
2163 case C_STAT:
2164 case C_LABEL:
2165 record_thumb_to_arm_glue (info, h);
2166 break;
2167 default:
2168 ;
2169 }
2170 break;
2171 #endif
2172
2173 default:
2174 break;
2175 }
2176 }
2177 }
2178
2179 return true;
2180 }
2181
2182 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2183
2184 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2185 #define coff_relocate_section coff_arm_relocate_section
2186 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2187 #define coff_adjust_symndx coff_arm_adjust_symndx
2188 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2189 #define coff_final_link_postscript coff_arm_final_link_postscript
2190 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2191 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2192 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2193 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2194 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2195
2196 /* When doing a relocateable link, we want to convert ARM26 relocs
2197 into ARM26D relocs. */
2198
2199 static boolean
2200 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2201 bfd *obfd ATTRIBUTE_UNUSED;
2202 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2203 bfd *ibfd;
2204 asection *sec;
2205 struct internal_reloc *irel;
2206 boolean *adjustedp;
2207 {
2208 if (irel->r_type == 3)
2209 {
2210 struct coff_link_hash_entry *h;
2211
2212 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2213 if (h != NULL
2214 && (h->root.type == bfd_link_hash_defined
2215 || h->root.type == bfd_link_hash_defweak)
2216 && h->root.u.def.section->output_section == sec->output_section)
2217 irel->r_type = 7;
2218 }
2219 *adjustedp = false;
2220 return true;
2221 }
2222
2223 /* Called when merging the private data areas of two BFDs.
2224 This is important as it allows us to detect if we are
2225 attempting to merge binaries compiled for different ARM
2226 targets, eg different CPUs or differents APCS's. */
2227
2228 static boolean
2229 coff_arm_merge_private_bfd_data (ibfd, obfd)
2230 bfd * ibfd;
2231 bfd * obfd;
2232 {
2233 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2234
2235 if (ibfd == obfd)
2236 return true;
2237
2238 /* If the two formats are different we cannot merge anything.
2239 This is not an error, since it is permissable to change the
2240 input and output formats. */
2241 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2242 || obfd->xvec->flavour != bfd_target_coff_flavour)
2243 return true;
2244
2245 /* Verify that the APCS is the same for the two BFDs */
2246 if (APCS_SET (ibfd))
2247 {
2248 if (APCS_SET (obfd))
2249 {
2250 /* If the src and dest have different APCS flag bits set, fail. */
2251 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2252 {
2253 _bfd_error_handler
2254 /* xgettext: c-format */
2255 (_("ERROR: %s is compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2256 bfd_archive_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2257 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2258 );
2259
2260 bfd_set_error (bfd_error_wrong_format);
2261 return false;
2262 }
2263
2264 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2265 {
2266 const char *msg;
2267
2268 if (APCS_FLOAT_FLAG (ibfd))
2269 /* xgettext: c-format */
2270 msg = _("ERROR: %s passes floats in float registers, whereas %s passes them in integer registers");
2271 else
2272 /* xgettext: c-format */
2273 msg = _("ERROR: %s passes floats in integer registers, whereas %s passes them in float registers");
2274
2275 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2276 bfd_get_filename (obfd));
2277
2278 bfd_set_error (bfd_error_wrong_format);
2279 return false;
2280 }
2281
2282 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2283 {
2284 const char * msg;
2285
2286 if (PIC_FLAG (ibfd))
2287 /* xgettext: c-format */
2288 msg = _("ERROR: %s is compiled as position independent code, whereas target %s is absolute position");
2289 else
2290 /* xgettext: c-format */
2291 msg = _("ERROR: %s is compiled as absolute position code, whereas target %s is position independent");
2292 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2293 bfd_get_filename (obfd));
2294
2295 bfd_set_error (bfd_error_wrong_format);
2296 return false;
2297 }
2298 }
2299 else
2300 {
2301 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2302
2303 /* Set up the arch and fields as well as these are probably wrong. */
2304 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2305 }
2306 }
2307
2308 /* Check the interworking support. */
2309 if (INTERWORK_SET (ibfd))
2310 {
2311 if (INTERWORK_SET (obfd))
2312 {
2313 /* If the src and dest differ in their interworking issue a warning. */
2314 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2315 {
2316 const char * msg;
2317
2318 if (INTERWORK_FLAG (ibfd))
2319 /* xgettext: c-format */
2320 msg = _("Warning: %s supports interworking, whereas %s does not");
2321 else
2322 /* xgettext: c-format */
2323 msg = _("Warning: %s does not support interworking, whereas %s does");
2324
2325 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2326 bfd_get_filename (obfd));
2327 }
2328 }
2329 else
2330 {
2331 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2332 }
2333 }
2334
2335 return true;
2336 }
2337
2338 /* Display the flags field. */
2339
2340 static boolean
2341 coff_arm_print_private_bfd_data (abfd, ptr)
2342 bfd * abfd;
2343 PTR ptr;
2344 {
2345 FILE * file = (FILE *) ptr;
2346
2347 BFD_ASSERT (abfd != NULL && ptr != NULL);
2348
2349 /* xgettext:c-format */
2350 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2351
2352 if (APCS_SET (abfd))
2353 {
2354 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2355 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2356
2357 if (APCS_FLOAT_FLAG (abfd))
2358 fprintf (file, _(" [floats passed in float registers]"));
2359 else
2360 fprintf (file, _(" [floats passed in integer registers]"));
2361
2362 if (PIC_FLAG (abfd))
2363 fprintf (file, _(" [position independent]"));
2364 else
2365 fprintf (file, _(" [absolute position]"));
2366 }
2367
2368 if (! INTERWORK_SET (abfd))
2369 fprintf (file, _(" [interworking flag not initialised]"));
2370 else if (INTERWORK_FLAG (abfd))
2371 fprintf (file, _(" [interworking supported]"));
2372 else
2373 fprintf (file, _(" [interworking not supported]"));
2374
2375 fputc ('\n', file);
2376
2377 return true;
2378 }
2379
2380 /* Copies the given flags into the coff_tdata.flags field.
2381 Typically these flags come from the f_flags[] field of
2382 the COFF filehdr structure, which contains important,
2383 target specific information.
2384 Note: Although this function is static, it is explicitly
2385 called from both coffcode.h and peicode.h. */
2386
2387 static boolean
2388 _bfd_coff_arm_set_private_flags (abfd, flags)
2389 bfd * abfd;
2390 flagword flags;
2391 {
2392 flagword flag;
2393
2394 BFD_ASSERT (abfd != NULL);
2395
2396 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2397
2398 /* Make sure that the APCS field has not been initialised to the opposite
2399 value. */
2400 if (APCS_SET (abfd)
2401 && ( (APCS_26_FLAG (abfd) != flag)
2402 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2403 || (PIC_FLAG (abfd) != (flags & F_PIC))
2404 ))
2405 return false;
2406
2407 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2408
2409 SET_APCS_FLAGS (abfd, flag);
2410
2411 flag = (flags & F_INTERWORK);
2412
2413 /* If the BFD has already had its interworking flag set, but it
2414 is different from the value that we have been asked to set,
2415 then assume that that merged code will not support interworking
2416 and set the flag accordingly. */
2417 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2418 {
2419 if (flag)
2420 /* xgettext: c-format */
2421 _bfd_error_handler (_("Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"),
2422 bfd_archive_filename (abfd));
2423 else
2424 /* xgettext: c-format */
2425 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2426 bfd_archive_filename (abfd));
2427 flag = 0;
2428 }
2429
2430 SET_INTERWORK_FLAG (abfd, flag);
2431
2432 return true;
2433 }
2434
2435 /* Copy the important parts of the target specific data
2436 from one instance of a BFD to another. */
2437
2438 static boolean
2439 coff_arm_copy_private_bfd_data (src, dest)
2440 bfd * src;
2441 bfd * dest;
2442 {
2443 BFD_ASSERT (src != NULL && dest != NULL);
2444
2445 if (src == dest)
2446 return true;
2447
2448 /* If the destination is not in the same format as the source, do not do
2449 the copy. */
2450 if (src->xvec != dest->xvec)
2451 return true;
2452
2453 /* copy the flags field */
2454 if (APCS_SET (src))
2455 {
2456 if (APCS_SET (dest))
2457 {
2458 /* If the src and dest have different APCS flag bits set, fail. */
2459 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2460 return false;
2461
2462 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2463 return false;
2464
2465 if (PIC_FLAG (dest) != PIC_FLAG (src))
2466 return false;
2467 }
2468 else
2469 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2470 | PIC_FLAG (src));
2471 }
2472
2473 if (INTERWORK_SET (src))
2474 {
2475 if (INTERWORK_SET (dest))
2476 {
2477 /* If the src and dest have different interworking flags then turn
2478 off the interworking bit. */
2479 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2480 {
2481 if (INTERWORK_FLAG (dest))
2482 {
2483 /* xgettext:c-format */
2484 _bfd_error_handler (("\
2485 Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"),
2486 bfd_get_filename (dest),
2487 bfd_archive_filename (src));
2488 }
2489
2490 SET_INTERWORK_FLAG (dest, 0);
2491 }
2492 }
2493 else
2494 {
2495 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2496 }
2497 }
2498
2499 return true;
2500 }
2501
2502 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2503 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2504 #define LOCAL_LABEL_PREFIX ""
2505 #ifndef USER_LABEL_PREFIX
2506 #define USER_LABEL_PREFIX "_"
2507 #endif
2508
2509 /* Like _bfd_coff_is_local_label_name, but
2510 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2511 non-local.
2512 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2513 labels of the form Lxxx to be stripped. */
2514 static boolean
2515 coff_arm_is_local_label_name (abfd, name)
2516 bfd * abfd ATTRIBUTE_UNUSED;
2517 const char * name;
2518 {
2519 #ifdef USER_LABEL_PREFIX
2520 if (USER_LABEL_PREFIX[0] != 0)
2521 {
2522 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2523 return false;
2524 }
2525 #endif
2526
2527 #ifdef LOCAL_LABEL_PREFIX
2528 /* If there is a prefix for local labels then look for this.
2529 If the prefix exists, but it is empty, then ignore the test. */
2530
2531 if (LOCAL_LABEL_PREFIX[0] != 0)
2532 {
2533 size_t len = strlen (LOCAL_LABEL_PREFIX);
2534
2535 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2536 return false;
2537
2538 /* Perform the checks below for the rest of the name. */
2539 name += len;
2540 }
2541 #endif
2542
2543 return name[0] == 'L';
2544 }
2545
2546 /* This piece of machinery exists only to guarantee that the bfd that holds
2547 the glue section is written last.
2548
2549 This does depend on bfd_make_section attaching a new section to the
2550 end of the section list for the bfd.
2551
2552 krk@cygnus.com */
2553
2554 static boolean
2555 coff_arm_link_output_has_begun (sub, info)
2556 bfd * sub;
2557 struct coff_final_link_info * info;
2558 {
2559 return (sub->output_has_begun
2560 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2561 }
2562
2563 static boolean
2564 coff_arm_final_link_postscript (abfd, pfinfo)
2565 bfd * abfd ATTRIBUTE_UNUSED;
2566 struct coff_final_link_info * pfinfo;
2567 {
2568 struct coff_arm_link_hash_table * globals;
2569
2570 globals = coff_arm_hash_table (pfinfo->info);
2571
2572 BFD_ASSERT (globals != NULL);
2573
2574 if (globals->bfd_of_glue_owner != NULL)
2575 {
2576 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2577 return false;
2578
2579 globals->bfd_of_glue_owner->output_has_begun = true;
2580 }
2581
2582 return true;
2583 }
2584
2585 #include "coffcode.h"
2586
2587 #ifndef TARGET_LITTLE_SYM
2588 #define TARGET_LITTLE_SYM armcoff_little_vec
2589 #endif
2590 #ifndef TARGET_LITTLE_NAME
2591 #define TARGET_LITTLE_NAME "coff-arm-little"
2592 #endif
2593 #ifndef TARGET_BIG_SYM
2594 #define TARGET_BIG_SYM armcoff_big_vec
2595 #endif
2596 #ifndef TARGET_BIG_NAME
2597 #define TARGET_BIG_NAME "coff-arm-big"
2598 #endif
2599
2600 #ifndef TARGET_UNDERSCORE
2601 #define TARGET_UNDERSCORE 0
2602 #endif
2603
2604 #ifndef EXTRA_S_FLAGS
2605 #ifdef COFF_WITH_PE
2606 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2607 #else
2608 #define EXTRA_S_FLAGS 0
2609 #endif
2610 #endif
2611
2612 /* Forward declaration for use initialising alternative_target field. */
2613 extern const bfd_target TARGET_BIG_SYM ;
2614
2615 /* Target vectors. */
2616 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2617 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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