1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002, 2003, 2004, 2005
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 bfd_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 bfd_boolean coff_arm_adjust_symndx
103 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
104 asection *, struct internal_reloc *, bfd_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 bfd_boolean coff_arm_merge_private_bfd_data
129 PARAMS ((bfd *, bfd *));
130 static bfd_boolean coff_arm_print_private_bfd_data
131 PARAMS ((bfd *, PTR));
132 static bfd_boolean _bfd_coff_arm_set_private_flags
133 PARAMS ((bfd *, flagword));
134 static bfd_boolean coff_arm_copy_private_bfd_data
135 PARAMS ((bfd *, bfd *));
136 static bfd_boolean coff_arm_is_local_label_name
137 PARAMS ((bfd *, const char *));
138 static bfd_boolean coff_arm_link_output_has_begun
139 PARAMS ((bfd *, struct coff_final_link_info *));
140 static bfd_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
coff_arm_reloc(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)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_26D 0
256 #define ARM_32 1
257 #define ARM_RVA32 2
258 #define ARM_26 3
259 #define ARM_THUMB12 4
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 HOWTO (ARM_26D,
268 2,
269 2,
270 24,
271 TRUE,
272 0,
273 complain_overflow_dont,
274 aoutarm_fix_pcrel_26_done,
275 "ARM_26D",
276 FALSE,
277 0x00ffffff,
278 0x0,
279 PCRELOFFSET),
280 HOWTO (ARM_32,
281 0,
282 2,
283 32,
284 FALSE,
285 0,
286 complain_overflow_bitfield,
287 coff_arm_reloc,
288 "ARM_32",
289 FALSE,
290 0xffffffff,
291 0xffffffff,
292 PCRELOFFSET),
293 HOWTO (ARM_RVA32,
294 0,
295 2,
296 32,
297 FALSE,
298 0,
299 complain_overflow_bitfield,
300 coff_arm_reloc,
301 "ARM_RVA32",
302 FALSE,
303 0xffffffff,
304 0xffffffff,
305 PCRELOFFSET),
306 HOWTO (ARM_26,
307 2,
308 2,
309 24,
310 TRUE,
311 0,
312 complain_overflow_signed,
313 aoutarm_fix_pcrel_26 ,
314 "ARM_26",
315 FALSE,
316 0x00ffffff,
317 0x00ffffff,
318 PCRELOFFSET),
319 HOWTO (ARM_THUMB12,
320 1,
321 1,
322 11,
323 TRUE,
324 0,
325 complain_overflow_signed,
326 coff_thumb_pcrel_12 ,
327 "ARM_THUMB12",
328 FALSE,
329 0x000007ff,
330 0x000007ff,
331 PCRELOFFSET),
332 EMPTY_HOWTO (-1),
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_SECTION",
350 FALSE,
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_SECREL",
363 FALSE,
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 bfd_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 bfd_boolean
in_reloc_p(abfd,howto)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 *
coff_arm_rtype_to_howto(abfd,sec,rel,h,sym,addendp)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
aoutarm_fix_pcrel_26_done(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)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
aoutarm_fix_pcrel_26(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)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
coff_thumb_pcrel_common(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message,btype)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
coff_thumb_pcrel_23(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)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
coff_thumb_pcrel_9(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)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
coff_thumb_pcrel_12(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)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 *
coff_arm_reloc_type_lookup(abfd,code)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 containing the Thumb-to-ARM glue. */
925 bfd_size_type thumb_glue_size;
926
927 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
928 bfd_size_type arm_glue_size;
929
930 /* An arbitrary 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 *
coff_arm_link_hash_table_create(abfd)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
arm_emit_base_file_entry(info,output_bfd,input_section,reloc_offset)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
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 (identified 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
insert_thumb_branch(br_insn,rel_off)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
1045 static struct coff_link_hash_entry *
find_thumb_glue(info,name,input_bfd)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 (_("%B: unable to find THUMB glue '%s' for `%s'"),
1067 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 *
find_arm_glue(info,name,input_bfd)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 (_("%B: unable to find ARM glue '%s' for `%s'"),
1097 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 bfd_boolean
coff_arm_relocate_section(output_bfd,info,input_bfd,input_section,contents,relocs,syms,sections)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 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1206
1207 rel = relocs;
1208 relend = rel + input_section->reloc_count;
1209
1210 for (; rel < relend; rel++)
1211 {
1212 int done = 0;
1213 long symndx;
1214 struct coff_link_hash_entry * h;
1215 struct internal_syment * sym;
1216 bfd_vma addend;
1217 bfd_vma val;
1218 reloc_howto_type * howto;
1219 bfd_reloc_status_type rstat;
1220 bfd_vma h_val;
1221
1222 symndx = rel->r_symndx;
1223
1224 if (symndx == -1)
1225 {
1226 h = NULL;
1227 sym = NULL;
1228 }
1229 else
1230 {
1231 h = obj_coff_sym_hashes (input_bfd)[symndx];
1232 sym = syms + symndx;
1233 }
1234
1235 /* COFF treats common symbols in one of two ways. Either the
1236 size of the symbol is included in the section contents, or it
1237 is not. We assume that the size is not included, and force
1238 the rtype_to_howto function to adjust the addend as needed. */
1239
1240 if (sym != NULL && sym->n_scnum != 0)
1241 addend = - sym->n_value;
1242 else
1243 addend = 0;
1244
1245 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1246 sym, &addend);
1247 if (howto == NULL)
1248 return FALSE;
1249
1250 /* The relocation_section function will skip pcrel_offset relocs
1251 when doing a relocatable link. However, we want to convert
1252 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1253 this case without pcrel_offset set, and adjust the addend to
1254 compensate. 'partial_inplace' is also set, since we want 'done'
1255 relocations to be reflected in section's data. */
1256 if (rel->r_type == ARM_26
1257 && h != NULL
1258 && info->relocatable
1259 && (h->root.type == bfd_link_hash_defined
1260 || h->root.type == bfd_link_hash_defweak)
1261 && (h->root.u.def.section->output_section
1262 == input_section->output_section))
1263 {
1264 static reloc_howto_type fake_arm26_reloc =
1265 HOWTO (ARM_26,
1266 2,
1267 2,
1268 24,
1269 TRUE,
1270 0,
1271 complain_overflow_signed,
1272 aoutarm_fix_pcrel_26 ,
1273 "ARM_26",
1274 TRUE,
1275 0x00ffffff,
1276 0x00ffffff,
1277 FALSE);
1278
1279 addend -= rel->r_vaddr - input_section->vma;
1280 #ifdef ARM_WINCE
1281 /* FIXME: I don't know why, but the hack is necessary for correct
1282 generation of bl's instruction offset. */
1283 addend -= 8;
1284 #endif
1285 howto = &fake_arm26_reloc;
1286 }
1287
1288 #ifdef ARM_WINCE
1289 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1290 the next opcode's pc, so is off by one. */
1291 #endif
1292
1293 /* If we are doing a relocatable link, then we can just ignore
1294 a PC relative reloc that is pcrel_offset. It will already
1295 have the correct value. If this is not a relocatable link,
1296 then we should ignore the symbol value. */
1297 if (howto->pc_relative && howto->pcrel_offset)
1298 {
1299 if (info->relocatable)
1300 continue;
1301 /* FIXME - it is not clear which targets need this next test
1302 and which do not. It is known that it is needed for the
1303 VxWorks and EPOC-PE targets, but it is also known that it
1304 was suppressed for other ARM targets. This ought to be
1305 sorted out one day. */
1306 #ifdef ARM_COFF_BUGFIX
1307 /* We must not ignore the symbol value. If the symbol is
1308 within the same section, the relocation should have already
1309 been fixed, but if it is not, we'll be handed a reloc into
1310 the beginning of the symbol's section, so we must not cancel
1311 out the symbol's value, otherwise we'll be adding it in
1312 twice. */
1313 if (sym != NULL && sym->n_scnum != 0)
1314 addend += sym->n_value;
1315 #endif
1316 }
1317
1318 val = 0;
1319
1320 if (h == NULL)
1321 {
1322 asection *sec;
1323
1324 if (symndx == -1)
1325 {
1326 sec = bfd_abs_section_ptr;
1327 val = 0;
1328 }
1329 else
1330 {
1331 sec = sections[symndx];
1332 val = (sec->output_section->vma
1333 + sec->output_offset
1334 + sym->n_value
1335 - sec->vma);
1336 }
1337 }
1338 else
1339 {
1340 /* We don't output the stubs if we are generating a
1341 relocatable output file, since we may as well leave the
1342 stub generation to the final linker pass. If we fail to
1343 verify that the name is defined, we'll try to build stubs
1344 for an undefined name... */
1345 if (! info->relocatable
1346 && ( h->root.type == bfd_link_hash_defined
1347 || h->root.type == bfd_link_hash_defweak))
1348 {
1349 asection * h_sec = h->root.u.def.section;
1350 const char * name = h->root.root.string;
1351
1352 /* h locates the symbol referenced in the reloc. */
1353 h_val = (h->root.u.def.value
1354 + h_sec->output_section->vma
1355 + h_sec->output_offset);
1356
1357 if (howto->type == ARM_26)
1358 {
1359 if ( h->class == C_THUMBSTATFUNC
1360 || h->class == C_THUMBEXTFUNC)
1361 {
1362 /* Arm code calling a Thumb function. */
1363 unsigned long int tmp;
1364 bfd_vma my_offset;
1365 asection * s;
1366 long int ret_offset;
1367 struct coff_link_hash_entry * myh;
1368 struct coff_arm_link_hash_table * globals;
1369
1370 myh = find_arm_glue (info, name, input_bfd);
1371 if (myh == NULL)
1372 return FALSE;
1373
1374 globals = coff_arm_hash_table (info);
1375
1376 BFD_ASSERT (globals != NULL);
1377 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1378
1379 my_offset = myh->root.u.def.value;
1380
1381 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1382 ARM2THUMB_GLUE_SECTION_NAME);
1383 BFD_ASSERT (s != NULL);
1384 BFD_ASSERT (s->contents != NULL);
1385 BFD_ASSERT (s->output_section != NULL);
1386
1387 if ((my_offset & 0x01) == 0x01)
1388 {
1389 if (h_sec->owner != NULL
1390 && INTERWORK_SET (h_sec->owner)
1391 && ! INTERWORK_FLAG (h_sec->owner))
1392 _bfd_error_handler
1393 /* xgettext:c-format */
1394 (_("%B(%s): warning: interworking not enabled.\n"
1395 " first occurrence: %B: arm call to thumb"),
1396 h_sec->owner, input_bfd, name);
1397
1398 --my_offset;
1399 myh->root.u.def.value = my_offset;
1400
1401 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1402 s->contents + my_offset);
1403
1404 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1405 s->contents + my_offset + 4);
1406
1407 /* It's a thumb address. Add the low order bit. */
1408 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1409 s->contents + my_offset + 8);
1410
1411 if (info->base_file)
1412 arm_emit_base_file_entry (info, output_bfd, s,
1413 my_offset + 8);
1414
1415 }
1416
1417 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1418
1419 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1420 - input_section->vma);
1421
1422 tmp = tmp & 0xFF000000;
1423
1424 /* Somehow these are both 4 too far, so subtract 8. */
1425 ret_offset =
1426 s->output_offset
1427 + my_offset
1428 + s->output_section->vma
1429 - (input_section->output_offset
1430 + input_section->output_section->vma
1431 + rel->r_vaddr)
1432 - 8;
1433
1434 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1435
1436 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1437 contents + rel->r_vaddr - input_section->vma);
1438 done = 1;
1439 }
1440 }
1441
1442 #ifndef ARM_WINCE
1443 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1444 else if (howto->type == ARM_THUMB23)
1445 {
1446 if ( h->class == C_EXT
1447 || h->class == C_STAT
1448 || h->class == C_LABEL)
1449 {
1450 /* Thumb code calling an ARM function */
1451 asection * s = 0;
1452 bfd_vma my_offset;
1453 unsigned long int tmp;
1454 long int ret_offset;
1455 struct coff_link_hash_entry * myh;
1456 struct coff_arm_link_hash_table * globals;
1457
1458 myh = find_thumb_glue (info, name, input_bfd);
1459 if (myh == NULL)
1460 return FALSE;
1461
1462 globals = coff_arm_hash_table (info);
1463
1464 BFD_ASSERT (globals != NULL);
1465 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1466
1467 my_offset = myh->root.u.def.value;
1468
1469 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1470 THUMB2ARM_GLUE_SECTION_NAME);
1471
1472 BFD_ASSERT (s != NULL);
1473 BFD_ASSERT (s->contents != NULL);
1474 BFD_ASSERT (s->output_section != NULL);
1475
1476 if ((my_offset & 0x01) == 0x01)
1477 {
1478 if (h_sec->owner != NULL
1479 && INTERWORK_SET (h_sec->owner)
1480 && ! INTERWORK_FLAG (h_sec->owner)
1481 && ! globals->support_old_code)
1482 _bfd_error_handler
1483 /* xgettext:c-format */
1484 (_("%B(%s): warning: interworking not enabled.\n"
1485 " first occurrence: %B: thumb call to arm\n"
1486 " consider relinking with --support-old-code enabled"),
1487 h_sec->owner, input_bfd, name);
1488
1489 -- my_offset;
1490 myh->root.u.def.value = my_offset;
1491
1492 if (globals->support_old_code)
1493 {
1494 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1495 s->contents + my_offset);
1496
1497 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1498 s->contents + my_offset + 2);
1499
1500 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1501 s->contents + my_offset + 4);
1502
1503 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1504 s->contents + my_offset + 6);
1505
1506 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1507 s->contents + my_offset + 8);
1508
1509 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1510 s->contents + my_offset + 12);
1511
1512 /* Store the address of the function in the last word of the stub. */
1513 bfd_put_32 (output_bfd, h_val,
1514 s->contents + my_offset + 16);
1515
1516 if (info->base_file)
1517 arm_emit_base_file_entry (info, output_bfd, s,
1518 my_offset + 16);
1519 }
1520 else
1521 {
1522 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1523 s->contents + my_offset);
1524
1525 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1526 s->contents + my_offset + 2);
1527
1528 ret_offset =
1529 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1530 - ((bfd_signed_vma)
1531 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1532 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1533 + s->output_section->vma) /* Address of the start of the current section. */
1534 + 4 /* The branch instruction is 4 bytes into the stub. */
1535 + 8); /* ARM branches work from the pc of the instruction + 8. */
1536
1537 bfd_put_32 (output_bfd,
1538 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1539 s->contents + my_offset + 4);
1540
1541 }
1542 }
1543
1544 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1545
1546 /* Now go back and fix up the original BL insn to point
1547 to here. */
1548 ret_offset =
1549 s->output_offset
1550 + my_offset
1551 - (input_section->output_offset
1552 + rel->r_vaddr)
1553 -4;
1554
1555 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1556 - input_section->vma);
1557
1558 bfd_put_32 (output_bfd,
1559 (bfd_vma) insert_thumb_branch (tmp,
1560 ret_offset),
1561 contents + rel->r_vaddr - input_section->vma);
1562
1563 done = 1;
1564 }
1565 }
1566 #endif
1567 }
1568
1569 /* If the relocation type and destination symbol does not
1570 fall into one of the above categories, then we can just
1571 perform a direct link. */
1572
1573 if (done)
1574 rstat = bfd_reloc_ok;
1575 else
1576 if ( h->root.type == bfd_link_hash_defined
1577 || h->root.type == bfd_link_hash_defweak)
1578 {
1579 asection *sec;
1580
1581 sec = h->root.u.def.section;
1582 val = (h->root.u.def.value
1583 + sec->output_section->vma
1584 + sec->output_offset);
1585 }
1586
1587 else if (! info->relocatable)
1588 {
1589 if (! ((*info->callbacks->undefined_symbol)
1590 (info, h->root.root.string, input_bfd, input_section,
1591 rel->r_vaddr - input_section->vma, TRUE)))
1592 return FALSE;
1593 }
1594 }
1595
1596 if (info->base_file)
1597 {
1598 /* Emit a reloc if the backend thinks it needs it. */
1599 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1600 arm_emit_base_file_entry (info, output_bfd, input_section,
1601 rel->r_vaddr);
1602 }
1603
1604 if (done)
1605 rstat = bfd_reloc_ok;
1606 #ifndef ARM_WINCE
1607 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1608 else if (! info->relocatable
1609 && howto->type == ARM_THUMB23)
1610 {
1611 /* This is pretty much a copy of what the default
1612 _bfd_final_link_relocate and _bfd_relocate_contents
1613 routines do to perform a relocation, with special
1614 processing for the split addressing of the Thumb BL
1615 instruction. Again, it would probably be simpler adding a
1616 ThumbBRANCH23 specific macro expansion into the default
1617 code. */
1618
1619 bfd_vma address = rel->r_vaddr - input_section->vma;
1620
1621 if (address > high_address)
1622 rstat = bfd_reloc_outofrange;
1623 else
1624 {
1625 bfd_vma relocation = val + addend;
1626 int size = bfd_get_reloc_size (howto);
1627 bfd_boolean overflow = FALSE;
1628 bfd_byte *location = contents + address;
1629 bfd_vma x = bfd_get_32 (input_bfd, location);
1630 bfd_vma src_mask = 0x007FFFFE;
1631 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1632 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1633 bfd_vma check;
1634 bfd_signed_vma signed_check;
1635 bfd_vma add;
1636 bfd_signed_vma signed_add;
1637
1638 BFD_ASSERT (size == 4);
1639
1640 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1641 relocation -= (input_section->output_section->vma
1642 + input_section->output_offset);
1643
1644 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1645 relocation -= address;
1646
1647 /* No need to negate the relocation with BRANCH23. */
1648 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1649 /* howto->rightshift == 1 */
1650
1651 /* Drop unwanted bits from the value we are relocating to. */
1652 check = relocation >> howto->rightshift;
1653
1654 /* If this is a signed value, the rightshift just dropped
1655 leading 1 bits (assuming twos complement). */
1656 if ((bfd_signed_vma) relocation >= 0)
1657 signed_check = check;
1658 else
1659 signed_check = (check
1660 | ((bfd_vma) - 1
1661 & ~((bfd_vma) - 1 >> howto->rightshift)));
1662
1663 /* Get the value from the object file. */
1664 if (bfd_big_endian (input_bfd))
1665 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1666 else
1667 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1668
1669 /* Get the value from the object file with an appropriate sign.
1670 The expression involving howto->src_mask isolates the upper
1671 bit of src_mask. If that bit is set in the value we are
1672 adding, it is negative, and we subtract out that number times
1673 two. If src_mask includes the highest possible bit, then we
1674 can not get the upper bit, but that does not matter since
1675 signed_add needs no adjustment to become negative in that
1676 case. */
1677 signed_add = add;
1678
1679 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1680 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1681
1682 /* howto->bitpos == 0 */
1683 /* Add the value from the object file, shifted so that it is a
1684 straight number. */
1685 signed_check += signed_add;
1686 relocation += signed_add;
1687
1688 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1689
1690 /* Assumes two's complement. */
1691 if ( signed_check > reloc_signed_max
1692 || signed_check < reloc_signed_min)
1693 overflow = TRUE;
1694
1695 /* Put the relocation into the correct bits.
1696 For a BLX instruction, make sure that the relocation is rounded up
1697 to a word boundary. This follows the semantics of the instruction
1698 which specifies that bit 1 of the target address will come from bit
1699 1 of the base address. */
1700 if (bfd_big_endian (input_bfd))
1701 {
1702 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1703 relocation += 2;
1704 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1705 }
1706 else
1707 {
1708 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1709 relocation += 2;
1710 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1711 }
1712
1713 /* Add the relocation to the correct bits of X. */
1714 x = ((x & ~howto->dst_mask) | relocation);
1715
1716 /* Put the relocated value back in the object file. */
1717 bfd_put_32 (input_bfd, x, location);
1718
1719 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1720 }
1721 }
1722 #endif
1723 else
1724 if (info->relocatable && ! howto->partial_inplace)
1725 rstat = bfd_reloc_ok;
1726 else
1727 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1728 contents,
1729 rel->r_vaddr - input_section->vma,
1730 val, addend);
1731 /* FIXME:
1732 Is this the best way to fix up thumb addresses? krk@cygnus.com
1733 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1734 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1735 if (! info->relocatable
1736 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1737 {
1738 /* Determine if we need to set the bottom bit of a relocated address
1739 because the address is the address of a Thumb code symbol. */
1740
1741 int patchit = FALSE;
1742
1743 if (h != NULL
1744 && ( h->class == C_THUMBSTATFUNC
1745 || h->class == C_THUMBEXTFUNC))
1746 {
1747 patchit = TRUE;
1748 }
1749 else if (sym != NULL
1750 && sym->n_scnum > N_UNDEF)
1751 {
1752 /* No hash entry - use the symbol instead. */
1753
1754 if ( sym->n_sclass == C_THUMBSTATFUNC
1755 || sym->n_sclass == C_THUMBEXTFUNC)
1756 patchit = TRUE;
1757 }
1758
1759 if (patchit)
1760 {
1761 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1762 bfd_vma x = bfd_get_32 (input_bfd, location);
1763
1764 bfd_put_32 (input_bfd, x | 1, location);
1765 }
1766 }
1767
1768 switch (rstat)
1769 {
1770 default:
1771 abort ();
1772 case bfd_reloc_ok:
1773 break;
1774 case bfd_reloc_outofrange:
1775 (*_bfd_error_handler)
1776 (_("%B: bad reloc address 0x%lx in section `%A'"),
1777 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1778 return FALSE;
1779 case bfd_reloc_overflow:
1780 {
1781 const char *name;
1782 char buf[SYMNMLEN + 1];
1783
1784 if (symndx == -1)
1785 name = "*ABS*";
1786 else if (h != NULL)
1787 name = NULL;
1788 else
1789 {
1790 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1791 if (name == NULL)
1792 return FALSE;
1793 }
1794
1795 if (! ((*info->callbacks->reloc_overflow)
1796 (info, (h ? &h->root : NULL), name, howto->name,
1797 (bfd_vma) 0, input_bfd, input_section,
1798 rel->r_vaddr - input_section->vma)))
1799 return FALSE;
1800 }
1801 }
1802 }
1803
1804 return TRUE;
1805 }
1806
1807 #ifndef COFF_IMAGE_WITH_PE
1808
1809 bfd_boolean
bfd_arm_allocate_interworking_sections(info)1810 bfd_arm_allocate_interworking_sections (info)
1811 struct bfd_link_info * info;
1812 {
1813 asection * s;
1814 bfd_byte * foo;
1815 struct coff_arm_link_hash_table * globals;
1816
1817 globals = coff_arm_hash_table (info);
1818
1819 BFD_ASSERT (globals != NULL);
1820
1821 if (globals->arm_glue_size != 0)
1822 {
1823 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1824
1825 s = bfd_get_section_by_name
1826 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1827
1828 BFD_ASSERT (s != NULL);
1829
1830 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1831 globals->arm_glue_size);
1832
1833 s->size = globals->arm_glue_size;
1834 s->contents = foo;
1835 }
1836
1837 if (globals->thumb_glue_size != 0)
1838 {
1839 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1840
1841 s = bfd_get_section_by_name
1842 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1843
1844 BFD_ASSERT (s != NULL);
1845
1846 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1847 globals->thumb_glue_size);
1848
1849 s->size = globals->thumb_glue_size;
1850 s->contents = foo;
1851 }
1852
1853 return TRUE;
1854 }
1855
1856 static void
record_arm_to_thumb_glue(info,h)1857 record_arm_to_thumb_glue (info, h)
1858 struct bfd_link_info * info;
1859 struct coff_link_hash_entry * h;
1860 {
1861 const char * name = h->root.root.string;
1862 register asection * s;
1863 char * tmp_name;
1864 struct coff_link_hash_entry * myh;
1865 struct bfd_link_hash_entry * bh;
1866 struct coff_arm_link_hash_table * globals;
1867 bfd_vma val;
1868 bfd_size_type amt;
1869
1870 globals = coff_arm_hash_table (info);
1871
1872 BFD_ASSERT (globals != NULL);
1873 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1874
1875 s = bfd_get_section_by_name
1876 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1877
1878 BFD_ASSERT (s != NULL);
1879
1880 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1881 tmp_name = (char *) bfd_malloc (amt);
1882
1883 BFD_ASSERT (tmp_name);
1884
1885 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1886
1887 myh = coff_link_hash_lookup
1888 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1889
1890 if (myh != NULL)
1891 {
1892 free (tmp_name);
1893 return; /* we've already seen this guy */
1894 }
1895
1896 /* The only trick here is using globals->arm_glue_size as the value. Even
1897 though the section isn't allocated yet, this is where we will be putting
1898 it. */
1899
1900 bh = NULL;
1901 val = globals->arm_glue_size + 1;
1902 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1903 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1904
1905 free (tmp_name);
1906
1907 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1908
1909 return;
1910 }
1911
1912 #ifndef ARM_WINCE
1913 static void
record_thumb_to_arm_glue(info,h)1914 record_thumb_to_arm_glue (info, h)
1915 struct bfd_link_info * info;
1916 struct coff_link_hash_entry * h;
1917 {
1918 const char * name = h->root.root.string;
1919 register asection * s;
1920 char * tmp_name;
1921 struct coff_link_hash_entry * myh;
1922 struct bfd_link_hash_entry * bh;
1923 struct coff_arm_link_hash_table * globals;
1924 bfd_vma val;
1925 bfd_size_type amt;
1926
1927 globals = coff_arm_hash_table (info);
1928
1929 BFD_ASSERT (globals != NULL);
1930 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1931
1932 s = bfd_get_section_by_name
1933 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1934
1935 BFD_ASSERT (s != NULL);
1936
1937 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1938 tmp_name = (char *) bfd_malloc (amt);
1939
1940 BFD_ASSERT (tmp_name);
1941
1942 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1943
1944 myh = coff_link_hash_lookup
1945 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1946
1947 if (myh != NULL)
1948 {
1949 free (tmp_name);
1950 return; /* we've already seen this guy */
1951 }
1952
1953 bh = NULL;
1954 val = globals->thumb_glue_size + 1;
1955 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1956 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1957
1958 /* If we mark it 'thumb', the disassembler will do a better job. */
1959 myh = (struct coff_link_hash_entry *) bh;
1960 myh->class = C_THUMBEXTFUNC;
1961
1962 free (tmp_name);
1963
1964 /* Allocate another symbol to mark where we switch to arm mode. */
1965
1966 #define CHANGE_TO_ARM "__%s_change_to_arm"
1967 #define BACK_FROM_ARM "__%s_back_from_arm"
1968
1969 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1970 tmp_name = (char *) bfd_malloc (amt);
1971
1972 BFD_ASSERT (tmp_name);
1973
1974 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1975
1976 bh = NULL;
1977 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1978 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1979 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1980
1981 free (tmp_name);
1982
1983 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1984
1985 return;
1986 }
1987 #endif /* not ARM_WINCE */
1988
1989 /* Select a BFD to be used to hold the sections used by the glue code.
1990 This function is called from the linker scripts in ld/emultempl/
1991 {armcoff/pe}.em */
1992
1993 bfd_boolean
bfd_arm_get_bfd_for_interworking(abfd,info)1994 bfd_arm_get_bfd_for_interworking (abfd, info)
1995 bfd * abfd;
1996 struct bfd_link_info * info;
1997 {
1998 struct coff_arm_link_hash_table * globals;
1999 flagword flags;
2000 asection * sec;
2001
2002 /* If we are only performing a partial link do not bother
2003 getting a bfd to hold the glue. */
2004 if (info->relocatable)
2005 return TRUE;
2006
2007 globals = coff_arm_hash_table (info);
2008
2009 BFD_ASSERT (globals != NULL);
2010
2011 if (globals->bfd_of_glue_owner != NULL)
2012 return TRUE;
2013
2014 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2015
2016 if (sec == NULL)
2017 {
2018 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2019
2020 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2021
2022 if (sec == NULL
2023 || ! bfd_set_section_flags (abfd, sec, flags)
2024 || ! bfd_set_section_alignment (abfd, sec, 2))
2025 return FALSE;
2026 }
2027
2028 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2029
2030 if (sec == NULL)
2031 {
2032 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2033
2034 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2035
2036 if (sec == NULL
2037 || ! bfd_set_section_flags (abfd, sec, flags)
2038 || ! bfd_set_section_alignment (abfd, sec, 2))
2039 return FALSE;
2040 }
2041
2042 /* Save the bfd for later use. */
2043 globals->bfd_of_glue_owner = abfd;
2044
2045 return TRUE;
2046 }
2047
2048 bfd_boolean
bfd_arm_process_before_allocation(abfd,info,support_old_code)2049 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2050 bfd * abfd;
2051 struct bfd_link_info * info;
2052 int support_old_code;
2053 {
2054 asection * sec;
2055 struct coff_arm_link_hash_table * globals;
2056
2057 /* If we are only performing a partial link do not bother
2058 to construct any glue. */
2059 if (info->relocatable)
2060 return TRUE;
2061
2062 /* Here we have a bfd that is to be included on the link. We have a hook
2063 to do reloc rummaging, before section sizes are nailed down. */
2064
2065 _bfd_coff_get_external_symbols (abfd);
2066
2067 globals = coff_arm_hash_table (info);
2068
2069 BFD_ASSERT (globals != NULL);
2070 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2071
2072 globals->support_old_code = support_old_code;
2073
2074 /* Rummage around all the relocs and map the glue vectors. */
2075 sec = abfd->sections;
2076
2077 if (sec == NULL)
2078 return TRUE;
2079
2080 for (; sec != NULL; sec = sec->next)
2081 {
2082 struct internal_reloc * i;
2083 struct internal_reloc * rel;
2084
2085 if (sec->reloc_count == 0)
2086 continue;
2087
2088 /* Load the relocs. */
2089 /* FIXME: there may be a storage leak here. */
2090
2091 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2092
2093 BFD_ASSERT (i != 0);
2094
2095 for (rel = i; rel < i + sec->reloc_count; ++rel)
2096 {
2097 unsigned short r_type = rel->r_type;
2098 long symndx;
2099 struct coff_link_hash_entry * h;
2100
2101 symndx = rel->r_symndx;
2102
2103 /* If the relocation is not against a symbol it cannot concern us. */
2104 if (symndx == -1)
2105 continue;
2106
2107 /* If the index is outside of the range of our table, something has gone wrong. */
2108 if (symndx >= obj_conv_table_size (abfd))
2109 {
2110 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2111 abfd, symndx);
2112 continue;
2113 }
2114
2115 h = obj_coff_sym_hashes (abfd)[symndx];
2116
2117 /* If the relocation is against a static symbol it must be within
2118 the current section and so cannot be a cross ARM/Thumb relocation. */
2119 if (h == NULL)
2120 continue;
2121
2122 switch (r_type)
2123 {
2124 case ARM_26:
2125 /* This one is a call from arm code. We need to look up
2126 the target of the call. If it is a thumb target, we
2127 insert glue. */
2128
2129 if (h->class == C_THUMBEXTFUNC)
2130 record_arm_to_thumb_glue (info, h);
2131 break;
2132
2133 #ifndef ARM_WINCE
2134 case ARM_THUMB23:
2135 /* This one is a call from thumb code. We used to look
2136 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2137 up the target of the call. If it is an arm target, we
2138 insert glue. If the symbol does not exist it will be
2139 given a class of C_EXT and so we will generate a stub
2140 for it. This is not really a problem, since the link
2141 is doomed anyway. */
2142
2143 switch (h->class)
2144 {
2145 case C_EXT:
2146 case C_STAT:
2147 case C_LABEL:
2148 record_thumb_to_arm_glue (info, h);
2149 break;
2150 default:
2151 ;
2152 }
2153 break;
2154 #endif
2155
2156 default:
2157 break;
2158 }
2159 }
2160 }
2161
2162 return TRUE;
2163 }
2164
2165 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2166
2167 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2168 #define coff_relocate_section coff_arm_relocate_section
2169 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2170 #define coff_adjust_symndx coff_arm_adjust_symndx
2171 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2172 #define coff_final_link_postscript coff_arm_final_link_postscript
2173 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2174 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2175 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2176 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2177 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2178
2179 /* When doing a relocatable link, we want to convert ARM_26 relocs
2180 into ARM_26D relocs. */
2181
2182 static bfd_boolean
coff_arm_adjust_symndx(obfd,info,ibfd,sec,irel,adjustedp)2183 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2184 bfd *obfd ATTRIBUTE_UNUSED;
2185 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2186 bfd *ibfd;
2187 asection *sec;
2188 struct internal_reloc *irel;
2189 bfd_boolean *adjustedp;
2190 {
2191 if (irel->r_type == ARM_26)
2192 {
2193 struct coff_link_hash_entry *h;
2194
2195 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2196 if (h != NULL
2197 && (h->root.type == bfd_link_hash_defined
2198 || h->root.type == bfd_link_hash_defweak)
2199 && h->root.u.def.section->output_section == sec->output_section)
2200 irel->r_type = ARM_26D;
2201 }
2202 *adjustedp = FALSE;
2203 return TRUE;
2204 }
2205
2206 /* Called when merging the private data areas of two BFDs.
2207 This is important as it allows us to detect if we are
2208 attempting to merge binaries compiled for different ARM
2209 targets, eg different CPUs or different APCS's. */
2210
2211 static bfd_boolean
coff_arm_merge_private_bfd_data(ibfd,obfd)2212 coff_arm_merge_private_bfd_data (ibfd, obfd)
2213 bfd * ibfd;
2214 bfd * obfd;
2215 {
2216 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2217
2218 if (ibfd == obfd)
2219 return TRUE;
2220
2221 /* If the two formats are different we cannot merge anything.
2222 This is not an error, since it is permissable to change the
2223 input and output formats. */
2224 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2225 || obfd->xvec->flavour != bfd_target_coff_flavour)
2226 return TRUE;
2227
2228 /* Determine what should happen if the input ARM architecture
2229 does not match the output ARM architecture. */
2230 if (! bfd_arm_merge_machines (ibfd, obfd))
2231 return FALSE;
2232
2233 /* Verify that the APCS is the same for the two BFDs. */
2234 if (APCS_SET (ibfd))
2235 {
2236 if (APCS_SET (obfd))
2237 {
2238 /* If the src and dest have different APCS flag bits set, fail. */
2239 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2240 {
2241 _bfd_error_handler
2242 /* xgettext: c-format */
2243 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2244 ibfd, obfd,
2245 APCS_26_FLAG (ibfd) ? 26 : 32,
2246 APCS_26_FLAG (obfd) ? 26 : 32
2247 );
2248
2249 bfd_set_error (bfd_error_wrong_format);
2250 return FALSE;
2251 }
2252
2253 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2254 {
2255 const char *msg;
2256
2257 if (APCS_FLOAT_FLAG (ibfd))
2258 /* xgettext: c-format */
2259 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2260 else
2261 /* xgettext: c-format */
2262 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2263
2264 _bfd_error_handler (msg, ibfd, obfd);
2265
2266 bfd_set_error (bfd_error_wrong_format);
2267 return FALSE;
2268 }
2269
2270 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2271 {
2272 const char * msg;
2273
2274 if (PIC_FLAG (ibfd))
2275 /* xgettext: c-format */
2276 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2277 else
2278 /* xgettext: c-format */
2279 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2280 _bfd_error_handler (msg, ibfd, obfd);
2281
2282 bfd_set_error (bfd_error_wrong_format);
2283 return FALSE;
2284 }
2285 }
2286 else
2287 {
2288 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2289
2290 /* Set up the arch and fields as well as these are probably wrong. */
2291 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2292 }
2293 }
2294
2295 /* Check the interworking support. */
2296 if (INTERWORK_SET (ibfd))
2297 {
2298 if (INTERWORK_SET (obfd))
2299 {
2300 /* If the src and dest differ in their interworking issue a warning. */
2301 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2302 {
2303 const char * msg;
2304
2305 if (INTERWORK_FLAG (ibfd))
2306 /* xgettext: c-format */
2307 msg = _("Warning: %B supports interworking, whereas %B does not");
2308 else
2309 /* xgettext: c-format */
2310 msg = _("Warning: %B does not support interworking, whereas %B does");
2311
2312 _bfd_error_handler (msg, ibfd, obfd);
2313 }
2314 }
2315 else
2316 {
2317 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2318 }
2319 }
2320
2321 return TRUE;
2322 }
2323
2324 /* Display the flags field. */
2325
2326 static bfd_boolean
coff_arm_print_private_bfd_data(abfd,ptr)2327 coff_arm_print_private_bfd_data (abfd, ptr)
2328 bfd * abfd;
2329 PTR ptr;
2330 {
2331 FILE * file = (FILE *) ptr;
2332
2333 BFD_ASSERT (abfd != NULL && ptr != NULL);
2334
2335 /* xgettext:c-format */
2336 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2337
2338 if (APCS_SET (abfd))
2339 {
2340 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2341 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2342
2343 if (APCS_FLOAT_FLAG (abfd))
2344 fprintf (file, _(" [floats passed in float registers]"));
2345 else
2346 fprintf (file, _(" [floats passed in integer registers]"));
2347
2348 if (PIC_FLAG (abfd))
2349 fprintf (file, _(" [position independent]"));
2350 else
2351 fprintf (file, _(" [absolute position]"));
2352 }
2353
2354 if (! INTERWORK_SET (abfd))
2355 fprintf (file, _(" [interworking flag not initialised]"));
2356 else if (INTERWORK_FLAG (abfd))
2357 fprintf (file, _(" [interworking supported]"));
2358 else
2359 fprintf (file, _(" [interworking not supported]"));
2360
2361 fputc ('\n', file);
2362
2363 return TRUE;
2364 }
2365
2366 /* Copies the given flags into the coff_tdata.flags field.
2367 Typically these flags come from the f_flags[] field of
2368 the COFF filehdr structure, which contains important,
2369 target specific information.
2370 Note: Although this function is static, it is explicitly
2371 called from both coffcode.h and peicode.h. */
2372
2373 static bfd_boolean
_bfd_coff_arm_set_private_flags(abfd,flags)2374 _bfd_coff_arm_set_private_flags (abfd, flags)
2375 bfd * abfd;
2376 flagword flags;
2377 {
2378 flagword flag;
2379
2380 BFD_ASSERT (abfd != NULL);
2381
2382 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2383
2384 /* Make sure that the APCS field has not been initialised to the opposite
2385 value. */
2386 if (APCS_SET (abfd)
2387 && ( (APCS_26_FLAG (abfd) != flag)
2388 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2389 || (PIC_FLAG (abfd) != (flags & F_PIC))
2390 ))
2391 return FALSE;
2392
2393 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2394
2395 SET_APCS_FLAGS (abfd, flag);
2396
2397 flag = (flags & F_INTERWORK);
2398
2399 /* If the BFD has already had its interworking flag set, but it
2400 is different from the value that we have been asked to set,
2401 then assume that that merged code will not support interworking
2402 and set the flag accordingly. */
2403 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2404 {
2405 if (flag)
2406 /* xgettext: c-format */
2407 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2408 abfd);
2409 else
2410 /* xgettext: c-format */
2411 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2412 abfd);
2413 flag = 0;
2414 }
2415
2416 SET_INTERWORK_FLAG (abfd, flag);
2417
2418 return TRUE;
2419 }
2420
2421 /* Copy the important parts of the target specific data
2422 from one instance of a BFD to another. */
2423
2424 static bfd_boolean
coff_arm_copy_private_bfd_data(src,dest)2425 coff_arm_copy_private_bfd_data (src, dest)
2426 bfd * src;
2427 bfd * dest;
2428 {
2429 BFD_ASSERT (src != NULL && dest != NULL);
2430
2431 if (src == dest)
2432 return TRUE;
2433
2434 /* If the destination is not in the same format as the source, do not do
2435 the copy. */
2436 if (src->xvec != dest->xvec)
2437 return TRUE;
2438
2439 /* copy the flags field */
2440 if (APCS_SET (src))
2441 {
2442 if (APCS_SET (dest))
2443 {
2444 /* If the src and dest have different APCS flag bits set, fail. */
2445 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2446 return FALSE;
2447
2448 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2449 return FALSE;
2450
2451 if (PIC_FLAG (dest) != PIC_FLAG (src))
2452 return FALSE;
2453 }
2454 else
2455 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2456 | PIC_FLAG (src));
2457 }
2458
2459 if (INTERWORK_SET (src))
2460 {
2461 if (INTERWORK_SET (dest))
2462 {
2463 /* If the src and dest have different interworking flags then turn
2464 off the interworking bit. */
2465 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2466 {
2467 if (INTERWORK_FLAG (dest))
2468 {
2469 /* xgettext:c-format */
2470 _bfd_error_handler (("\
2471 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2472 dest, src);
2473 }
2474
2475 SET_INTERWORK_FLAG (dest, 0);
2476 }
2477 }
2478 else
2479 {
2480 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2481 }
2482 }
2483
2484 return TRUE;
2485 }
2486
2487 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2488 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2489 #define LOCAL_LABEL_PREFIX ""
2490 #ifndef USER_LABEL_PREFIX
2491 #define USER_LABEL_PREFIX "_"
2492 #endif
2493
2494 /* Like _bfd_coff_is_local_label_name, but
2495 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2496 non-local.
2497 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2498 labels of the form Lxxx to be stripped. */
2499 static bfd_boolean
coff_arm_is_local_label_name(abfd,name)2500 coff_arm_is_local_label_name (abfd, name)
2501 bfd * abfd ATTRIBUTE_UNUSED;
2502 const char * name;
2503 {
2504 #ifdef USER_LABEL_PREFIX
2505 if (USER_LABEL_PREFIX[0] != 0)
2506 {
2507 size_t len = strlen (USER_LABEL_PREFIX);
2508
2509 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2510 return FALSE;
2511 }
2512 #endif
2513
2514 #ifdef LOCAL_LABEL_PREFIX
2515 /* If there is a prefix for local labels then look for this.
2516 If the prefix exists, but it is empty, then ignore the test. */
2517
2518 if (LOCAL_LABEL_PREFIX[0] != 0)
2519 {
2520 size_t len = strlen (LOCAL_LABEL_PREFIX);
2521
2522 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2523 return FALSE;
2524
2525 /* Perform the checks below for the rest of the name. */
2526 name += len;
2527 }
2528 #endif
2529
2530 return name[0] == 'L';
2531 }
2532
2533 /* This piece of machinery exists only to guarantee that the bfd that holds
2534 the glue section is written last.
2535
2536 This does depend on bfd_make_section attaching a new section to the
2537 end of the section list for the bfd.
2538
2539 krk@cygnus.com */
2540
2541 static bfd_boolean
coff_arm_link_output_has_begun(sub,info)2542 coff_arm_link_output_has_begun (sub, info)
2543 bfd * sub;
2544 struct coff_final_link_info * info;
2545 {
2546 return (sub->output_has_begun
2547 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2548 }
2549
2550 static bfd_boolean
coff_arm_final_link_postscript(abfd,pfinfo)2551 coff_arm_final_link_postscript (abfd, pfinfo)
2552 bfd * abfd ATTRIBUTE_UNUSED;
2553 struct coff_final_link_info * pfinfo;
2554 {
2555 struct coff_arm_link_hash_table * globals;
2556
2557 globals = coff_arm_hash_table (pfinfo->info);
2558
2559 BFD_ASSERT (globals != NULL);
2560
2561 if (globals->bfd_of_glue_owner != NULL)
2562 {
2563 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2564 return FALSE;
2565
2566 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2567 }
2568
2569 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2570 }
2571
2572 #include "coffcode.h"
2573
2574 #ifndef TARGET_LITTLE_SYM
2575 #define TARGET_LITTLE_SYM armcoff_little_vec
2576 #endif
2577 #ifndef TARGET_LITTLE_NAME
2578 #define TARGET_LITTLE_NAME "coff-arm-little"
2579 #endif
2580 #ifndef TARGET_BIG_SYM
2581 #define TARGET_BIG_SYM armcoff_big_vec
2582 #endif
2583 #ifndef TARGET_BIG_NAME
2584 #define TARGET_BIG_NAME "coff-arm-big"
2585 #endif
2586
2587 #ifndef TARGET_UNDERSCORE
2588 #define TARGET_UNDERSCORE 0
2589 #endif
2590
2591 #ifndef EXTRA_S_FLAGS
2592 #ifdef COFF_WITH_PE
2593 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2594 #else
2595 #define EXTRA_S_FLAGS SEC_CODE
2596 #endif
2597 #endif
2598
2599 /* Forward declaration for use initialising alternative_target field. */
2600 extern const bfd_target TARGET_BIG_SYM ;
2601
2602 /* Target vectors. */
2603 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2604 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)
2605