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Fix an overflow checking bug uncovered when a 32 bit target is compiled
[binutils.git] / opcodes / arm-dis.c
blobbaac4a4dfad3ec3ac9c83f323a3663878805b43a
1 /* Instruction printing code for the ARM
2 Copyright (C) 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
3 Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
4 Modification by James G. Smith (jsmith@cygnus.co.uk)
5
6 This file is part of libopcodes.
7
8 This program is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2 of the License, or (at your option)
11 any later version.
12
13 This program is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22 #include "dis-asm.h"
23 #define DEFINE_TABLE
24 #include "arm-opc.h"
25 #include "coff/internal.h"
26 #include "libcoff.h"
27 #include "opintl.h"
28
29 /* FIXME: This shouldn't be done here */
30 #include "elf-bfd.h"
31 #include "elf/internal.h"
32 #include "elf/arm.h"
33
34 static char * arm_conditional[] =
35 {"eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
36 "hi", "ls", "ge", "lt", "gt", "le", "", "nv"};
37
38 static char * arm_regnames_raw[] =
39 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
40 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"};
41
42 static char * arm_regnames_standard[] =
43 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
44 "r8", "r9", "r10", "r11", "r12", "sp", "lr", "pc"};
45
46 static char * arm_regnames_apcs[] =
47 {"a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4",
48 "v5", "v6", "sl", "fp", "ip", "sp", "lr", "pc"};
49
50 /* Choose which register name set to use. */
51 static char ** arm_regnames = arm_regnames_standard;
52
53 static char * arm_fp_const[] =
54 {"0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0"};
55
56 static char * arm_shift[] =
57 {"lsl", "lsr", "asr", "ror"};
58
59 static int print_insn_arm
60 PARAMS ((bfd_vma, struct disassemble_info *, long));
61
62 static void
63 arm_decode_shift (given, func, stream)
64 long given;
65 fprintf_ftype func;
66 void * stream;
67 {
68 func (stream, "%s", arm_regnames[given & 0xf]);
69
70 if ((given & 0xff0) != 0)
71 {
72 if ((given & 0x10) == 0)
73 {
74 int amount = (given & 0xf80) >> 7;
75 int shift = (given & 0x60) >> 5;
76
77 if (amount == 0)
78 {
79 if (shift == 3)
80 {
81 func (stream, ", rrx");
82 return;
83 }
84
85 amount = 32;
86 }
87
88 func (stream, ", %s #%d", arm_shift[shift], amount);
89 }
90 else
91 func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5],
92 arm_regnames[(given & 0xf00) >> 8]);
93 }
94 }
95
96 /* Print one instruction from PC on INFO->STREAM.
97 Return the size of the instruction (always 4 on ARM). */
98
99 static int
100 print_insn_arm (pc, info, given)
101 bfd_vma pc;
102 struct disassemble_info * info;
103 long given;
104 {
105 struct arm_opcode * insn;
106 void * stream = info->stream;
107 fprintf_ftype func = info->fprintf_func;
108
109 for (insn = arm_opcodes; insn->assembler; insn++)
110 {
111 if ((given & insn->mask) == insn->value)
112 {
113 char * c;
114
115 for (c = insn->assembler; *c; c++)
116 {
117 if (*c == '%')
118 {
119 switch (*++c)
120 {
121 case '%':
122 func (stream, "%%");
123 break;
124
125 case 'a':
126 if (((given & 0x000f0000) == 0x000f0000)
127 && ((given & 0x02000000) == 0))
128 {
129 int offset = given & 0xfff;
130
131 func (stream, "[pc");
132
133 if (given & 0x01000000)
134 {
135 if ((given & 0x00800000) == 0)
136 offset = - offset;
137
138 /* pre-indexed */
139 func (stream, ", #%x]", offset);
140
141 offset += pc + 8;
142
143 /* Cope with the possibility of write-back being used.
144 Probably a very dangerous thing for the programmer
145 to do, but who are we to argue ? */
146 if (given & 0x00200000)
147 func (stream, "!");
148 }
149 else
150 {
151 /* post indexed */
152 func (stream, "], #%x", offset);
153
154 offset = pc + 8; /* ie ignore the offset */
155 }
156
157 func (stream, "\t; ");
158 info->print_address_func (offset, info);
159 }
160 else
161 {
162 func (stream, "[%s",
163 arm_regnames[(given >> 16) & 0xf]);
164 if ((given & 0x01000000) != 0)
165 {
166 if ((given & 0x02000000) == 0)
167 {
168 int offset = given & 0xfff;
169 if (offset)
170 func (stream, ", %s#%d",
171 (((given & 0x00800000) == 0)
172 ? "-" : ""), offset);
173 }
174 else
175 {
176 func (stream, ", %s",
177 (((given & 0x00800000) == 0)
178 ? "-" : ""));
179 arm_decode_shift (given, func, stream);
180 }
181
182 func (stream, "]%s",
183 ((given & 0x00200000) != 0) ? "!" : "");
184 }
185 else
186 {
187 if ((given & 0x02000000) == 0)
188 {
189 int offset = given & 0xfff;
190 if (offset)
191 func (stream, "], %s#%d",
192 (((given & 0x00800000) == 0)
193 ? "-" : ""), offset);
194 else
195 func (stream, "]");
196 }
197 else
198 {
199 func (stream, "], %s",
200 (((given & 0x00800000) == 0)
201 ? "-" : ""));
202 arm_decode_shift (given, func, stream);
203 }
204 }
205 }
206 break;
207
208 case 's':
209 if ((given & 0x004f0000) == 0x004f0000)
210 {
211 /* PC relative with immediate offset */
212 int offset = ((given & 0xf00) >> 4) | (given & 0xf);
213
214 if ((given & 0x00800000) == 0)
215 offset = -offset;
216
217 func (stream, "[pc, #%x]\t; ", offset);
218
219 (*info->print_address_func)
220 (offset + pc + 8, info);
221 }
222 else
223 {
224 func (stream, "[%s",
225 arm_regnames[(given >> 16) & 0xf]);
226 if ((given & 0x01000000) != 0)
227 {
228 /* pre-indexed */
229 if ((given & 0x00400000) == 0x00400000)
230 {
231 /* immediate */
232 int offset = ((given & 0xf00) >> 4) | (given & 0xf);
233 if (offset)
234 func (stream, ", %s#%d",
235 (((given & 0x00800000) == 0)
236 ? "-" : ""), offset);
237 }
238 else
239 {
240 /* register */
241 func (stream, ", %s%s",
242 (((given & 0x00800000) == 0)
243 ? "-" : ""),
244 arm_regnames[given & 0xf]);
245 }
246
247 func (stream, "]%s",
248 ((given & 0x00200000) != 0) ? "!" : "");
249 }
250 else
251 {
252 /* post-indexed */
253 if ((given & 0x00400000) == 0x00400000)
254 {
255 /* immediate */
256 int offset = ((given & 0xf00) >> 4) | (given & 0xf);
257 if (offset)
258 func (stream, "], %s#%d",
259 (((given & 0x00800000) == 0)
260 ? "-" : ""), offset);
261 else
262 func (stream, "]");
263 }
264 else
265 {
266 /* register */
267 func (stream, "], %s%s",
268 (((given & 0x00800000) == 0)
269 ? "-" : ""),
270 arm_regnames[given & 0xf]);
271 }
272 }
273 }
274 break;
275
276 case 'b':
277 (*info->print_address_func)
278 (BDISP (given) * 4 + pc + 8, info);
279 break;
280
281 case 'c':
282 func (stream, "%s",
283 arm_conditional [(given >> 28) & 0xf]);
284 break;
285
286 case 'm':
287 {
288 int started = 0;
289 int reg;
290
291 func (stream, "{");
292 for (reg = 0; reg < 16; reg++)
293 if ((given & (1 << reg)) != 0)
294 {
295 if (started)
296 func (stream, ", ");
297 started = 1;
298 func (stream, "%s", arm_regnames[reg]);
299 }
300 func (stream, "}");
301 }
302 break;
303
304 case 'o':
305 if ((given & 0x02000000) != 0)
306 {
307 int rotate = (given & 0xf00) >> 7;
308 int immed = (given & 0xff);
309 immed = (((immed << (32 - rotate))
310 | (immed >> rotate)) & 0xffffffff);
311 func (stream, "#%d\t; 0x%x", immed, immed);
312 }
313 else
314 arm_decode_shift (given, func, stream);
315 break;
316
317 case 'p':
318 if ((given & 0x0000f000) == 0x0000f000)
319 func (stream, "p");
320 break;
321
322 case 't':
323 if ((given & 0x01200000) == 0x00200000)
324 func (stream, "t");
325 break;
326
327 case 'h':
328 if ((given & 0x00000020) == 0x00000020)
329 func (stream, "h");
330 else
331 func (stream, "b");
332 break;
333
334 case 'A':
335 func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]);
336 if ((given & 0x01000000) != 0)
337 {
338 int offset = given & 0xff;
339 if (offset)
340 func (stream, ", %s#%d]%s",
341 ((given & 0x00800000) == 0 ? "-" : ""),
342 offset * 4,
343 ((given & 0x00200000) != 0 ? "!" : ""));
344 else
345 func (stream, "]");
346 }
347 else
348 {
349 int offset = given & 0xff;
350 if (offset)
351 func (stream, "], %s#%d",
352 ((given & 0x00800000) == 0 ? "-" : ""),
353 offset * 4);
354 else
355 func (stream, "]");
356 }
357 break;
358
359 case 'C':
360 switch (given & 0x00090000)
361 {
362 default:
363 func (stream, "_???");
364 break;
365 case 0x90000:
366 func (stream, "_all");
367 break;
368 case 0x10000:
369 func (stream, "_ctl");
370 break;
371 case 0x80000:
372 func (stream, "_flg");
373 break;
374 }
375 break;
376
377 case 'F':
378 switch (given & 0x00408000)
379 {
380 case 0:
381 func (stream, "4");
382 break;
383 case 0x8000:
384 func (stream, "1");
385 break;
386 case 0x00400000:
387 func (stream, "2");
388 break;
389 default:
390 func (stream, "3");
391 }
392 break;
393
394 case 'P':
395 switch (given & 0x00080080)
396 {
397 case 0:
398 func (stream, "s");
399 break;
400 case 0x80:
401 func (stream, "d");
402 break;
403 case 0x00080000:
404 func (stream, "e");
405 break;
406 default:
407 func (stream, _("<illegal precision>"));
408 break;
409 }
410 break;
411 case 'Q':
412 switch (given & 0x00408000)
413 {
414 case 0:
415 func (stream, "s");
416 break;
417 case 0x8000:
418 func (stream, "d");
419 break;
420 case 0x00400000:
421 func (stream, "e");
422 break;
423 default:
424 func (stream, "p");
425 break;
426 }
427 break;
428 case 'R':
429 switch (given & 0x60)
430 {
431 case 0:
432 break;
433 case 0x20:
434 func (stream, "p");
435 break;
436 case 0x40:
437 func (stream, "m");
438 break;
439 default:
440 func (stream, "z");
441 break;
442 }
443 break;
444
445 case '0': case '1': case '2': case '3': case '4':
446 case '5': case '6': case '7': case '8': case '9':
447 {
448 int bitstart = *c++ - '0';
449 int bitend = 0;
450 while (*c >= '0' && *c <= '9')
451 bitstart = (bitstart * 10) + *c++ - '0';
452
453 switch (*c)
454 {
455 case '-':
456 c++;
457 while (*c >= '0' && *c <= '9')
458 bitend = (bitend * 10) + *c++ - '0';
459 if (!bitend)
460 abort ();
461 switch (*c)
462 {
463 case 'r':
464 {
465 long reg;
466 reg = given >> bitstart;
467 reg &= (2 << (bitend - bitstart)) - 1;
468 func (stream, "%s", arm_regnames[reg]);
469 }
470 break;
471 case 'd':
472 {
473 long reg;
474 reg = given >> bitstart;
475 reg &= (2 << (bitend - bitstart)) - 1;
476 func (stream, "%d", reg);
477 }
478 break;
479 case 'x':
480 {
481 long reg;
482 reg = given >> bitstart;
483 reg &= (2 << (bitend - bitstart)) - 1;
484 func (stream, "0x%08x", reg);
485
486 /* Some SWI instructions have special meanings. */
487 if ((given & 0x0fffffff) == 0x0FF00000)
488 func (stream, "\t; IMB");
489 else if ((given & 0x0fffffff) == 0x0FF00001)
490 func (stream, "\t; IMBRange");
491 }
492 break;
493 case 'f':
494 {
495 long reg;
496 reg = given >> bitstart;
497 reg &= (2 << (bitend - bitstart)) - 1;
498 if (reg > 7)
499 func (stream, "#%s",
500 arm_fp_const[reg & 7]);
501 else
502 func (stream, "f%d", reg);
503 }
504 break;
505 default:
506 abort ();
507 }
508 break;
509 case '`':
510 c++;
511 if ((given & (1 << bitstart)) == 0)
512 func (stream, "%c", *c);
513 break;
514 case '\'':
515 c++;
516 if ((given & (1 << bitstart)) != 0)
517 func (stream, "%c", *c);
518 break;
519 case '?':
520 ++c;
521 if ((given & (1 << bitstart)) != 0)
522 func (stream, "%c", *c++);
523 else
524 func (stream, "%c", *++c);
525 break;
526 default:
527 abort ();
528 }
529 break;
530
531 default:
532 abort ();
533 }
534 }
535 }
536 else
537 func (stream, "%c", *c);
538 }
539 return 4;
540 }
541 }
542 abort ();
543 }
544
545 /* Print one instruction from PC on INFO->STREAM.
546 Return the size of the instruction. */
547
548 static int
549 print_insn_thumb (pc, info, given)
550 bfd_vma pc;
551 struct disassemble_info * info;
552 long given;
553 {
554 struct thumb_opcode * insn;
555 void * stream = info->stream;
556 fprintf_ftype func = info->fprintf_func;
557
558 for (insn = thumb_opcodes; insn->assembler; insn++)
559 {
560 if ((given & insn->mask) == insn->value)
561 {
562 char * c = insn->assembler;
563
564 /* Special processing for Thumb 2 instruction BL sequence: */
565 if (!*c) /* check for empty (not NULL) assembler string */
566 {
567 info->bytes_per_chunk = 4;
568 info->bytes_per_line = 4;
569
570 func (stream, "%04x\tbl\t", given & 0xffff);
571 (*info->print_address_func)
572 (BDISP23 (given) * 2 + pc + 4, info);
573 return 4;
574 }
575 else
576 {
577 info->bytes_per_chunk = 2;
578 info->bytes_per_line = 4;
579
580 given &= 0xffff;
581 func (stream, "%04x\t", given);
582
583 for (; *c; c++)
584 {
585 if (*c == '%')
586 {
587 int domaskpc = 0;
588 int domasklr = 0;
589
590 switch (*++c)
591 {
592 case '%':
593 func (stream, "%%");
594 break;
595
596 case 'S':
597 {
598 long reg;
599 reg = (given >> 3) & 0x7;
600 if (given & (1 << 6))
601 reg += 8;
602 func (stream, "%s", arm_regnames[reg]);
603 }
604 break;
605
606 case 'D':
607 {
608 long reg;
609
610 reg = given & 0x7;
611 if (given & (1 << 7))
612 reg += 8;
613 func (stream, "%s", arm_regnames[reg]);
614 }
615 break;
616
617 case 'T':
618 func (stream, "%s",
619 arm_conditional [(given >> 8) & 0xf]);
620 break;
621
622 case 'N':
623 if (given & (1 << 8))
624 domasklr = 1;
625 /* fall through */
626 case 'O':
627 if (*c == 'O' && (given & (1 << 8)))
628 domaskpc = 1;
629 /* fall through */
630 case 'M':
631 {
632 int started = 0;
633 int reg;
634
635 func (stream, "{");
636 /* It would be nice if we could spot
637 ranges, and generate the rS-rE format: */
638 for (reg = 0; (reg < 8); reg++)
639 if ((given & (1 << reg)) != 0)
640 {
641 if (started)
642 func (stream, ", ");
643 started = 1;
644 func (stream, "%s", arm_regnames[reg]);
645 }
646
647 if (domasklr)
648 {
649 if (started)
650 func (stream, ", ");
651 started = 1;
652 func (stream, "lr");
653 }
654
655 if (domaskpc)
656 {
657 if (started)
658 func (stream, ", ");
659 func (stream, "pc");
660 }
661
662 func (stream, "}");
663 }
664 break;
665
666
667 case '0': case '1': case '2': case '3': case '4':
668 case '5': case '6': case '7': case '8': case '9':
669 {
670 int bitstart = *c++ - '0';
671 int bitend = 0;
672
673 while (*c >= '0' && *c <= '9')
674 bitstart = (bitstart * 10) + *c++ - '0';
675
676 switch (*c)
677 {
678 case '-':
679 {
680 long reg;
681
682 c++;
683 while (*c >= '0' && *c <= '9')
684 bitend = (bitend * 10) + *c++ - '0';
685 if (!bitend)
686 abort ();
687 reg = given >> bitstart;
688 reg &= (2 << (bitend - bitstart)) - 1;
689 switch (*c)
690 {
691 case 'r':
692 func (stream, "%s", arm_regnames[reg]);
693 break;
694
695 case 'd':
696 func (stream, "%d", reg);
697 break;
698
699 case 'H':
700 func (stream, "%d", reg << 1);
701 break;
702
703 case 'W':
704 func (stream, "%d", reg << 2);
705 break;
706
707 case 'a':
708 /* PC-relative address -- the bottom two
709 bits of the address are dropped before
710 the calculation. */
711 info->print_address_func
712 (((pc + 4) & ~3) + (reg << 2), info);
713 break;
714
715 case 'x':
716 func (stream, "0x%04x", reg);
717 break;
718
719 case 'I':
720 reg = ((reg ^ (1 << bitend)) - (1 << bitend));
721 func (stream, "%d", reg);
722 break;
723
724 case 'B':
725 reg = ((reg ^ (1 << bitend)) - (1 << bitend));
726 (*info->print_address_func)
727 (reg * 2 + pc + 4, info);
728 break;
729
730 default:
731 abort ();
732 }
733 }
734 break;
735
736 case '\'':
737 c++;
738 if ((given & (1 << bitstart)) != 0)
739 func (stream, "%c", *c);
740 break;
741
742 case '?':
743 ++c;
744 if ((given & (1 << bitstart)) != 0)
745 func (stream, "%c", *c++);
746 else
747 func (stream, "%c", *++c);
748 break;
749
750 default:
751 abort ();
752 }
753 }
754 break;
755
756 default:
757 abort ();
758 }
759 }
760 else
761 func (stream, "%c", *c);
762 }
763 }
764 return 2;
765 }
766 }
767
768 /* no match */
769 abort ();
770 }
771
772 /* Select a different register name set.
773 Returns true if the name set selected is the APCS name set. */
774 int
775 arm_toggle_regnames ()
776 {
777 if (arm_regnames == arm_regnames_standard)
778 arm_regnames = arm_regnames_apcs;
779 else
780 arm_regnames = arm_regnames_standard;
781
782 return arm_regnames == arm_regnames_apcs;
783 }
784
785 static void
786 parse_disassembler_options (options)
787 char * options;
788 {
789 if (options == NULL)
790 return;
791
792 if (strncmp (options, "reg-names-", 10) == 0)
793 {
794 options += 10;
795
796 if (strcmp (options, "std") == 0)
797 arm_regnames = arm_regnames_standard;
798 else if (strcmp (options, "apcs") == 0)
799 arm_regnames = arm_regnames_apcs;
800 else if (strcmp (options, "raw") == 0)
801 arm_regnames = arm_regnames_raw;
802 else
803 fprintf (stderr, "Unrecognised register name set: %s\n", options);
804 }
805 else
806 fprintf (stderr, "Unrecognised disassembler option: %s\n", options);
807
808 return;
809 }
810
811 /* NOTE: There are no checks in these routines that the relevant number of data bytes exist */
812
813 int
814 print_insn_big_arm (pc, info)
815 bfd_vma pc;
816 struct disassemble_info * info;
817 {
818 unsigned char b[4];
819 long given;
820 int status;
821 coff_symbol_type * cs;
822 elf_symbol_type * es;
823 int is_thumb;
824
825 if (info->disassembler_options)
826 {
827 parse_disassembler_options (info->disassembler_options);
828
829 /* To avoid repeated parsing of this option, we remove it here. */
830 info->disassembler_options = NULL;
831 }
832
833 is_thumb = false;
834 if (info->symbols != NULL)
835 {
836 if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
837 {
838 cs = coffsymbol (*info->symbols);
839 is_thumb = ( cs->native->u.syment.n_sclass == C_THUMBEXT
840 || cs->native->u.syment.n_sclass == C_THUMBSTAT
841 || cs->native->u.syment.n_sclass == C_THUMBLABEL
842 || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
843 || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
844 }
845 else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
846 {
847 es = *(elf_symbol_type **)(info->symbols);
848 is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
849 STT_ARM_TFUNC;
850 }
851 }
852
853 info->bytes_per_chunk = 4;
854 info->display_endian = BFD_ENDIAN_BIG;
855
856 /* Always fetch word aligned values. */
857
858 status = (*info->read_memory_func) (pc & ~ 0x3, (bfd_byte *) &b[0], 4, info);
859 if (status != 0)
860 {
861 (*info->memory_error_func) (status, pc, info);
862 return -1;
863 }
864
865 if (is_thumb)
866 {
867 if (pc & 0x2)
868 {
869 given = (b[2] << 8) | b[3];
870
871 status = info->read_memory_func ((pc + 4) & ~ 0x3, (bfd_byte *) b, 4, info);
872 if (status != 0)
873 {
874 info->memory_error_func (status, pc + 4, info);
875 return -1;
876 }
877
878 given |= (b[0] << 24) | (b[1] << 16);
879 }
880 else
881 given = (b[0] << 8) | b[1] | (b[2] << 24) | (b[3] << 16);
882 }
883 else
884 given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
885
886 if (is_thumb)
887 status = print_insn_thumb (pc, info, given);
888 else
889 status = print_insn_arm (pc, info, given);
890
891 return status;
892 }
893
894 int
895 print_insn_little_arm (pc, info)
896 bfd_vma pc;
897 struct disassemble_info * info;
898 {
899 unsigned char b[4];
900 long given;
901 int status;
902 coff_symbol_type * cs;
903 elf_symbol_type * es;
904 int is_thumb;
905
906 if (info->disassembler_options)
907 {
908 parse_disassembler_options (info->disassembler_options);
909
910 /* To avoid repeated parsing of this option, we remove it here. */
911 info->disassembler_options = NULL;
912 }
913
914 is_thumb = false;
915
916 if (info->symbols != NULL)
917 {
918 if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
919 {
920 cs = coffsymbol (*info->symbols);
921 is_thumb = ( cs->native->u.syment.n_sclass == C_THUMBEXT
922 || cs->native->u.syment.n_sclass == C_THUMBSTAT
923 || cs->native->u.syment.n_sclass == C_THUMBLABEL
924 || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
925 || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
926 }
927 else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
928 {
929 es = *(elf_symbol_type **)(info->symbols);
930 is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
931 STT_ARM_TFUNC;
932 }
933 }
934
935 info->bytes_per_chunk = 4;
936 info->display_endian = BFD_ENDIAN_LITTLE;
937
938 status = (*info->read_memory_func) (pc, (bfd_byte *) &b[0], 4, info);
939 if (status != 0 && is_thumb)
940 {
941 info->bytes_per_chunk = 2;
942
943 status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
944 b[3] = b[2] = 0;
945 }
946 if (status != 0)
947 {
948 (*info->memory_error_func) (status, pc, info);
949 return -1;
950 }
951
952 given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
953
954 if (is_thumb)
955 status = print_insn_thumb (pc, info, given);
956 else
957 status = print_insn_arm (pc, info, given);
958
959 return status;
960 }
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