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ARM: fix target address when disassembling Thumb BLX
[openocd/simonqian.git] / src / target / arm_disassembler.c
blobee087b1215372f044b79db41b003518b2102980e
1 /***************************************************************************
2 * Copyright (C) 2006 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2009 by David Brownell *
6 * *
7 * This program is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU General Public License as published by *
9 * the Free Software Foundation; either version 2 of the License, or *
10 * (at your option) any later version. *
11 * *
12 * This program is distributed in the hope that it will be useful, *
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15 * GNU General Public License for more details. *
16 * *
17 * You should have received a copy of the GNU General Public License *
18 * along with this program; if not, write to the *
19 * Free Software Foundation, Inc., *
20 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
21 ***************************************************************************/
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25
26 #include "target.h"
27 #include "arm_disassembler.h"
28 #include "log.h"
29
30
31 /*
32 * This disassembler supports two main functions for OpenOCD:
33 *
34 * - Various "disassemble" commands. OpenOCD can serve as a
35 * machine-language debugger, without help from GDB.
36 *
37 * - Single stepping. Not all ARM cores support hardware single
38 * stepping. To work without that support, the debugger must
39 * be able to decode instructions to find out where to put a
40 * "next instruction" breakpoint.
41 *
42 * In addition, interpretation of ETM trace data needs some of the
43 * decoding mechanisms.
44 *
45 * At this writing (September 2009) neither function is complete.
46 *
47 * - ARM decoding
48 * * Old-style syntax (not UAL) is generally used
49 * * VFP instructions are not understood (ARMv5 and later)
50 * except as coprocessor 10/11 operations
51 * * Most ARM instructions through ARMv6 are decoded, but some
52 * of the post-ARMv4 opcodes may not be handled yet
53 * * NEON instructions are not understood (ARMv7-A)
54 *
55 * - Thumb/Thumb2 decoding
56 * * UAL syntax should be consistently used
57 * * Any Thumb2 instructions used in Cortex-M3 (ARMv7-M) should
58 * be handled properly. Accordingly, so should the subset
59 * used in Cortex-M0/M1; and "original" 16-bit Thumb from
60 * ARMv4T and ARMv5T.
61 * * Conditional effects of Thumb2 "IT" (if-then) instructions
62 * are not handled: the affected instructions are not shown
63 * with their now-conditional suffixes.
64 * * Some ARMv6 and ARMv7-M Thumb2 instructions may not be
65 * handled (minimally for coprocessor access).
66 * * SIMD instructions, and some other Thumb2 instructions
67 * from ARMv7-A, are not understood.
68 *
69 * - ThumbEE decoding
70 * * As a Thumb2 variant, the Thumb2 comments (above) apply.
71 * * Opcodes changed by ThumbEE mode are not handled; these
72 * instructions wrongly decode as LDM and STM.
73 *
74 * - Jazelle decoding ... no support whatsoever for Jazelle mode
75 * or decoding. ARM encourages use of the more generic ThumbEE
76 * mode, instead of Jazelle mode, in current chips.
77 *
78 * - Single-step/emulation ... spotty support, which is only weakly
79 * tested. Thumb2 is not supported. (Arguably a full simulator
80 * is not needed to support just single stepping. Recognizing
81 * branch vs non-branch instructions suffices, except when the
82 * instruction faults and triggers a synchronous exception which
83 * can be intercepted using other means.)
84 *
85 * ARM DDI 0406B "ARM Architecture Reference Manual, ARM v7-A and
86 * ARM v7-R edition" gives the most complete coverage of the various
87 * generations of ARM instructions. At this writing it is publicly
88 * accessible to anyone willing to create an account at the ARM
89 * web site; see http://www.arm.com/documentation/ for information.
90 *
91 * ARM DDI 0403C "ARMv7-M Architecture Reference Manual" provides
92 * more details relevant to the Thumb2-only processors (such as
93 * the Cortex-M implementations).
94 */
95
96 /* textual represenation of the condition field */
97 /* ALways (default) is ommitted (empty string) */
98 static const char *arm_condition_strings[] =
99 {
100 "EQ", "NE", "CS", "CC", "MI", "PL", "VS", "VC", "HI", "LS", "GE", "LT", "GT", "LE", "", "NV"
101 };
102
103 /* make up for C's missing ROR */
104 static uint32_t ror(uint32_t value, int places)
105 {
106 return (value >> places) | (value << (32 - places));
107 }
108
109 static int evaluate_pld(uint32_t opcode,
110 uint32_t address, arm_instruction_t *instruction)
111 {
112 /* PLD */
113 if ((opcode & 0x0d70f000) == 0x0550f000)
114 {
115 instruction->type = ARM_PLD;
116
117 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tPLD ...TODO...", address, opcode);
118
119 return ERROR_OK;
120 }
121 else
122 {
123 instruction->type = ARM_UNDEFINED_INSTRUCTION;
124 return ERROR_OK;
125 }
126
127 LOG_ERROR("should never reach this point");
128 return -1;
129 }
130
131 static int evaluate_swi(uint32_t opcode,
132 uint32_t address, arm_instruction_t *instruction)
133 {
134 instruction->type = ARM_SWI;
135
136 snprintf(instruction->text, 128,
137 "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSVC %#6.6" PRIx32,
138 address, opcode, (opcode & 0xffffff));
139
140 return ERROR_OK;
141 }
142
143 static int evaluate_blx_imm(uint32_t opcode,
144 uint32_t address, arm_instruction_t *instruction)
145 {
146 int offset;
147 uint32_t immediate;
148 uint32_t target_address;
149
150 instruction->type = ARM_BLX;
151 immediate = opcode & 0x00ffffff;
152
153 /* sign extend 24-bit immediate */
154 if (immediate & 0x00800000)
155 offset = 0xff000000 | immediate;
156 else
157 offset = immediate;
158
159 /* shift two bits left */
160 offset <<= 2;
161
162 /* odd/event halfword */
163 if (opcode & 0x01000000)
164 offset |= 0x2;
165
166 target_address = address + 8 + offset;
167
168 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBLX 0x%8.8" PRIx32 "", address, opcode, target_address);
169
170 instruction->info.b_bl_bx_blx.reg_operand = -1;
171 instruction->info.b_bl_bx_blx.target_address = target_address;
172
173 return ERROR_OK;
174 }
175
176 static int evaluate_b_bl(uint32_t opcode,
177 uint32_t address, arm_instruction_t *instruction)
178 {
179 uint8_t L;
180 uint32_t immediate;
181 int offset;
182 uint32_t target_address;
183
184 immediate = opcode & 0x00ffffff;
185 L = (opcode & 0x01000000) >> 24;
186
187 /* sign extend 24-bit immediate */
188 if (immediate & 0x00800000)
189 offset = 0xff000000 | immediate;
190 else
191 offset = immediate;
192
193 /* shift two bits left */
194 offset <<= 2;
195
196 target_address = address + 8 + offset;
197
198 if (L)
199 instruction->type = ARM_BL;
200 else
201 instruction->type = ARM_B;
202
203 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tB%s%s 0x%8.8" PRIx32 , address, opcode,
204 (L) ? "L" : "", COND(opcode), target_address);
205
206 instruction->info.b_bl_bx_blx.reg_operand = -1;
207 instruction->info.b_bl_bx_blx.target_address = target_address;
208
209 return ERROR_OK;
210 }
211
212 /* Coprocessor load/store and double register transfers */
213 /* both normal and extended instruction space (condition field b1111) */
214 static int evaluate_ldc_stc_mcrr_mrrc(uint32_t opcode,
215 uint32_t address, arm_instruction_t *instruction)
216 {
217 uint8_t cp_num = (opcode & 0xf00) >> 8;
218
219 /* MCRR or MRRC */
220 if (((opcode & 0x0ff00000) == 0x0c400000) || ((opcode & 0x0ff00000) == 0x0c400000))
221 {
222 uint8_t cp_opcode, Rd, Rn, CRm;
223 char *mnemonic;
224
225 cp_opcode = (opcode & 0xf0) >> 4;
226 Rd = (opcode & 0xf000) >> 12;
227 Rn = (opcode & 0xf0000) >> 16;
228 CRm = (opcode & 0xf);
229
230 /* MCRR */
231 if ((opcode & 0x0ff00000) == 0x0c400000)
232 {
233 instruction->type = ARM_MCRR;
234 mnemonic = "MCRR";
235 }
236
237 /* MRRC */
238 if ((opcode & 0x0ff00000) == 0x0c500000)
239 {
240 instruction->type = ARM_MRRC;
241 mnemonic = "MRRC";
242 }
243
244 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s p%i, %x, r%i, r%i, c%i",
245 address, opcode, mnemonic, COND(opcode), cp_num, cp_opcode, Rd, Rn, CRm);
246 }
247 else /* LDC or STC */
248 {
249 uint8_t CRd, Rn, offset;
250 uint8_t U, N;
251 char *mnemonic;
252 char addressing_mode[32];
253
254 CRd = (opcode & 0xf000) >> 12;
255 Rn = (opcode & 0xf0000) >> 16;
256 offset = (opcode & 0xff);
257
258 /* load/store */
259 if (opcode & 0x00100000)
260 {
261 instruction->type = ARM_LDC;
262 mnemonic = "LDC";
263 }
264 else
265 {
266 instruction->type = ARM_STC;
267 mnemonic = "STC";
268 }
269
270 U = (opcode & 0x00800000) >> 23;
271 N = (opcode & 0x00400000) >> 22;
272
273 /* addressing modes */
274 if ((opcode & 0x01200000) == 0x01000000) /* immediate offset */
275 snprintf(addressing_mode, 32, "[r%i, #%s0x%2.2x*4]", Rn, (U) ? "" : "-", offset);
276 else if ((opcode & 0x01200000) == 0x01200000) /* immediate pre-indexed */
277 snprintf(addressing_mode, 32, "[r%i, #%s0x%2.2x*4]!", Rn, (U) ? "" : "-", offset);
278 else if ((opcode & 0x01200000) == 0x00200000) /* immediate post-indexed */
279 snprintf(addressing_mode, 32, "[r%i], #%s0x%2.2x*4", Rn, (U) ? "" : "-", offset);
280 else if ((opcode & 0x01200000) == 0x00000000) /* unindexed */
281 snprintf(addressing_mode, 32, "[r%i], #0x%2.2x", Rn, offset);
282
283 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s p%i, c%i, %s",
284 address, opcode, mnemonic, ((opcode & 0xf0000000) == 0xf0000000) ? COND(opcode) : "2",
285 (N) ? "L" : "",
286 cp_num, CRd, addressing_mode);
287 }
288
289 return ERROR_OK;
290 }
291
292 /* Coprocessor data processing instructions */
293 /* Coprocessor register transfer instructions */
294 /* both normal and extended instruction space (condition field b1111) */
295 static int evaluate_cdp_mcr_mrc(uint32_t opcode,
296 uint32_t address, arm_instruction_t *instruction)
297 {
298 const char *cond;
299 char* mnemonic;
300 uint8_t cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2;
301
302 cond = ((opcode & 0xf0000000) == 0xf0000000) ? "2" : COND(opcode);
303 cp_num = (opcode & 0xf00) >> 8;
304 CRd_Rd = (opcode & 0xf000) >> 12;
305 CRn = (opcode & 0xf0000) >> 16;
306 CRm = (opcode & 0xf);
307 opcode_2 = (opcode & 0xe0) >> 5;
308
309 /* CDP or MRC/MCR */
310 if (opcode & 0x00000010) /* bit 4 set -> MRC/MCR */
311 {
312 if (opcode & 0x00100000) /* bit 20 set -> MRC */
313 {
314 instruction->type = ARM_MRC;
315 mnemonic = "MRC";
316 }
317 else /* bit 20 not set -> MCR */
318 {
319 instruction->type = ARM_MCR;
320 mnemonic = "MCR";
321 }
322
323 opcode_1 = (opcode & 0x00e00000) >> 21;
324
325 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s p%i, 0x%2.2x, r%i, c%i, c%i, 0x%2.2x",
326 address, opcode, mnemonic, cond,
327 cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2);
328 }
329 else /* bit 4 not set -> CDP */
330 {
331 instruction->type = ARM_CDP;
332 mnemonic = "CDP";
333
334 opcode_1 = (opcode & 0x00f00000) >> 20;
335
336 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s p%i, 0x%2.2x, c%i, c%i, c%i, 0x%2.2x",
337 address, opcode, mnemonic, cond,
338 cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2);
339 }
340
341 return ERROR_OK;
342 }
343
344 /* Load/store instructions */
345 static int evaluate_load_store(uint32_t opcode,
346 uint32_t address, arm_instruction_t *instruction)
347 {
348 uint8_t I, P, U, B, W, L;
349 uint8_t Rn, Rd;
350 char *operation; /* "LDR" or "STR" */
351 char *suffix; /* "", "B", "T", "BT" */
352 char offset[32];
353
354 /* examine flags */
355 I = (opcode & 0x02000000) >> 25;
356 P = (opcode & 0x01000000) >> 24;
357 U = (opcode & 0x00800000) >> 23;
358 B = (opcode & 0x00400000) >> 22;
359 W = (opcode & 0x00200000) >> 21;
360 L = (opcode & 0x00100000) >> 20;
361
362 /* target register */
363 Rd = (opcode & 0xf000) >> 12;
364
365 /* base register */
366 Rn = (opcode & 0xf0000) >> 16;
367
368 instruction->info.load_store.Rd = Rd;
369 instruction->info.load_store.Rn = Rn;
370 instruction->info.load_store.U = U;
371
372 /* determine operation */
373 if (L)
374 operation = "LDR";
375 else
376 operation = "STR";
377
378 /* determine instruction type and suffix */
379 if (B)
380 {
381 if ((P == 0) && (W == 1))
382 {
383 if (L)
384 instruction->type = ARM_LDRBT;
385 else
386 instruction->type = ARM_STRBT;
387 suffix = "BT";
388 }
389 else
390 {
391 if (L)
392 instruction->type = ARM_LDRB;
393 else
394 instruction->type = ARM_STRB;
395 suffix = "B";
396 }
397 }
398 else
399 {
400 if ((P == 0) && (W == 1))
401 {
402 if (L)
403 instruction->type = ARM_LDRT;
404 else
405 instruction->type = ARM_STRT;
406 suffix = "T";
407 }
408 else
409 {
410 if (L)
411 instruction->type = ARM_LDR;
412 else
413 instruction->type = ARM_STR;
414 suffix = "";
415 }
416 }
417
418 if (!I) /* #+-<offset_12> */
419 {
420 uint32_t offset_12 = (opcode & 0xfff);
421 if (offset_12)
422 snprintf(offset, 32, ", #%s0x%" PRIx32 "", (U) ? "" : "-", offset_12);
423 else
424 snprintf(offset, 32, "%s", "");
425
426 instruction->info.load_store.offset_mode = 0;
427 instruction->info.load_store.offset.offset = offset_12;
428 }
429 else /* either +-<Rm> or +-<Rm>, <shift>, #<shift_imm> */
430 {
431 uint8_t shift_imm, shift;
432 uint8_t Rm;
433
434 shift_imm = (opcode & 0xf80) >> 7;
435 shift = (opcode & 0x60) >> 5;
436 Rm = (opcode & 0xf);
437
438 /* LSR encodes a shift by 32 bit as 0x0 */
439 if ((shift == 0x1) && (shift_imm == 0x0))
440 shift_imm = 0x20;
441
442 /* ASR encodes a shift by 32 bit as 0x0 */
443 if ((shift == 0x2) && (shift_imm == 0x0))
444 shift_imm = 0x20;
445
446 /* ROR by 32 bit is actually a RRX */
447 if ((shift == 0x3) && (shift_imm == 0x0))
448 shift = 0x4;
449
450 instruction->info.load_store.offset_mode = 1;
451 instruction->info.load_store.offset.reg.Rm = Rm;
452 instruction->info.load_store.offset.reg.shift = shift;
453 instruction->info.load_store.offset.reg.shift_imm = shift_imm;
454
455 if ((shift_imm == 0x0) && (shift == 0x0)) /* +-<Rm> */
456 {
457 snprintf(offset, 32, ", %sr%i", (U) ? "" : "-", Rm);
458 }
459 else /* +-<Rm>, <Shift>, #<shift_imm> */
460 {
461 switch (shift)
462 {
463 case 0x0: /* LSL */
464 snprintf(offset, 32, ", %sr%i, LSL #0x%x", (U) ? "" : "-", Rm, shift_imm);
465 break;
466 case 0x1: /* LSR */
467 snprintf(offset, 32, ", %sr%i, LSR #0x%x", (U) ? "" : "-", Rm, shift_imm);
468 break;
469 case 0x2: /* ASR */
470 snprintf(offset, 32, ", %sr%i, ASR #0x%x", (U) ? "" : "-", Rm, shift_imm);
471 break;
472 case 0x3: /* ROR */
473 snprintf(offset, 32, ", %sr%i, ROR #0x%x", (U) ? "" : "-", Rm, shift_imm);
474 break;
475 case 0x4: /* RRX */
476 snprintf(offset, 32, ", %sr%i, RRX", (U) ? "" : "-", Rm);
477 break;
478 }
479 }
480 }
481
482 if (P == 1)
483 {
484 if (W == 0) /* offset */
485 {
486 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i%s]",
487 address, opcode, operation, COND(opcode), suffix,
488 Rd, Rn, offset);
489
490 instruction->info.load_store.index_mode = 0;
491 }
492 else /* pre-indexed */
493 {
494 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i%s]!",
495 address, opcode, operation, COND(opcode), suffix,
496 Rd, Rn, offset);
497
498 instruction->info.load_store.index_mode = 1;
499 }
500 }
501 else /* post-indexed */
502 {
503 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i]%s",
504 address, opcode, operation, COND(opcode), suffix,
505 Rd, Rn, offset);
506
507 instruction->info.load_store.index_mode = 2;
508 }
509
510 return ERROR_OK;
511 }
512
513 static int evaluate_extend(uint32_t opcode, uint32_t address, char *cp)
514 {
515 unsigned rm = (opcode >> 0) & 0xf;
516 unsigned rd = (opcode >> 12) & 0xf;
517 unsigned rn = (opcode >> 16) & 0xf;
518 char *type, *rot;
519
520 switch ((opcode >> 24) & 0x3) {
521 case 0:
522 type = "B16";
523 break;
524 case 1:
525 sprintf(cp, "UNDEFINED");
526 return ARM_UNDEFINED_INSTRUCTION;
527 case 2:
528 type = "B";
529 break;
530 default:
531 type = "H";
532 break;
533 }
534
535 switch ((opcode >> 10) & 0x3) {
536 case 0:
537 rot = "";
538 break;
539 case 1:
540 rot = ", ROR #8";
541 break;
542 case 2:
543 rot = ", ROR #16";
544 break;
545 default:
546 rot = ", ROR #24";
547 break;
548 }
549
550 if (rn == 0xf) {
551 sprintf(cp, "%cXT%s%s\tr%d, r%d%s",
552 (opcode & (1 << 22)) ? 'U' : 'S',
553 type, COND(opcode),
554 rd, rm, rot);
555 return ARM_MOV;
556 } else {
557 sprintf(cp, "%cXTA%s%s\tr%d, r%d, r%d%s",
558 (opcode & (1 << 22)) ? 'U' : 'S',
559 type, COND(opcode),
560 rd, rn, rm, rot);
561 return ARM_ADD;
562 }
563 }
564
565 static int evaluate_p_add_sub(uint32_t opcode, uint32_t address, char *cp)
566 {
567 char *prefix;
568 char *op;
569 int type;
570
571 switch ((opcode >> 20) & 0x7) {
572 case 1:
573 prefix = "S";
574 break;
575 case 2:
576 prefix = "Q";
577 break;
578 case 3:
579 prefix = "SH";
580 break;
581 case 5:
582 prefix = "U";
583 break;
584 case 6:
585 prefix = "UQ";
586 break;
587 case 7:
588 prefix = "UH";
589 break;
590 default:
591 goto undef;
592 }
593
594 switch ((opcode >> 5) & 0x7) {
595 case 0:
596 op = "ADD16";
597 type = ARM_ADD;
598 break;
599 case 1:
600 op = "ADDSUBX";
601 type = ARM_ADD;
602 break;
603 case 2:
604 op = "SUBADDX";
605 type = ARM_SUB;
606 break;
607 case 3:
608 op = "SUB16";
609 type = ARM_SUB;
610 break;
611 case 4:
612 op = "ADD8";
613 type = ARM_ADD;
614 break;
615 case 7:
616 op = "SUB8";
617 type = ARM_SUB;
618 break;
619 default:
620 goto undef;
621 }
622
623 sprintf(cp, "%s%s%s\tr%d, r%d, r%d", prefix, op, COND(opcode),
624 (int) (opcode >> 12) & 0xf,
625 (int) (opcode >> 16) & 0xf,
626 (int) (opcode >> 0) & 0xf);
627 return type;
628
629 undef:
630 /* these opcodes might be used someday */
631 sprintf(cp, "UNDEFINED");
632 return ARM_UNDEFINED_INSTRUCTION;
633 }
634
635 /* ARMv6 and later support "media" instructions (includes SIMD) */
636 static int evaluate_media(uint32_t opcode, uint32_t address,
637 arm_instruction_t *instruction)
638 {
639 char *cp = instruction->text;
640 char *mnemonic = NULL;
641
642 sprintf(cp,
643 "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t",
644 address, opcode);
645 cp = strchr(cp, 0);
646
647 /* parallel add/subtract */
648 if ((opcode & 0x01800000) == 0x00000000) {
649 instruction->type = evaluate_p_add_sub(opcode, address, cp);
650 return ERROR_OK;
651 }
652
653 /* halfword pack */
654 if ((opcode & 0x01f00020) == 0x00800000) {
655 char *type, *shift;
656 unsigned imm = (unsigned) (opcode >> 7) & 0x1f;
657
658 if (opcode & (1 << 6)) {
659 type = "TB";
660 shift = "ASR";
661 if (imm == 0)
662 imm = 32;
663 } else {
664 type = "BT";
665 shift = "LSL";
666 }
667 sprintf(cp, "PKH%s%s\tr%d, r%d, r%d, %s #%d",
668 type, COND(opcode),
669 (int) (opcode >> 12) & 0xf,
670 (int) (opcode >> 16) & 0xf,
671 (int) (opcode >> 0) & 0xf,
672 shift, imm);
673 return ERROR_OK;
674 }
675
676 /* word saturate */
677 if ((opcode & 0x01a00020) == 0x00a00000) {
678 char *shift;
679 unsigned imm = (unsigned) (opcode >> 7) & 0x1f;
680
681 if (opcode & (1 << 6)) {
682 shift = "ASR";
683 if (imm == 0)
684 imm = 32;
685 } else {
686 shift = "LSL";
687 }
688
689 sprintf(cp, "%cSAT%s\tr%d, #%d, r%d, %s #%d",
690 (opcode & (1 << 22)) ? 'U' : 'S',
691 COND(opcode),
692 (int) (opcode >> 12) & 0xf,
693 (int) (opcode >> 16) & 0x1f,
694 (int) (opcode >> 0) & 0xf,
695 shift, imm);
696 return ERROR_OK;
697 }
698
699 /* sign extension */
700 if ((opcode & 0x018000f0) == 0x00800070) {
701 instruction->type = evaluate_extend(opcode, address, cp);
702 return ERROR_OK;
703 }
704
705 /* multiplies */
706 if ((opcode & 0x01f00080) == 0x01000000) {
707 unsigned rn = (opcode >> 12) & 0xf;
708
709 if (rn != 0xf)
710 sprintf(cp, "SML%cD%s%s\tr%d, r%d, r%d, r%d",
711 (opcode & (1 << 6)) ? 'S' : 'A',
712 (opcode & (1 << 5)) ? "X" : "",
713 COND(opcode),
714 (int) (opcode >> 16) & 0xf,
715 (int) (opcode >> 0) & 0xf,
716 (int) (opcode >> 8) & 0xf,
717 rn);
718 else
719 sprintf(cp, "SMU%cD%s%s\tr%d, r%d, r%d",
720 (opcode & (1 << 6)) ? 'S' : 'A',
721 (opcode & (1 << 5)) ? "X" : "",
722 COND(opcode),
723 (int) (opcode >> 16) & 0xf,
724 (int) (opcode >> 0) & 0xf,
725 (int) (opcode >> 8) & 0xf);
726 return ERROR_OK;
727 }
728 if ((opcode & 0x01f00000) == 0x01400000) {
729 sprintf(cp, "SML%cLD%s%s\tr%d, r%d, r%d, r%d",
730 (opcode & (1 << 6)) ? 'S' : 'A',
731 (opcode & (1 << 5)) ? "X" : "",
732 COND(opcode),
733 (int) (opcode >> 12) & 0xf,
734 (int) (opcode >> 16) & 0xf,
735 (int) (opcode >> 0) & 0xf,
736 (int) (opcode >> 8) & 0xf);
737 return ERROR_OK;
738 }
739 if ((opcode & 0x01f00000) == 0x01500000) {
740 unsigned rn = (opcode >> 12) & 0xf;
741
742 switch (opcode & 0xc0) {
743 case 3:
744 if (rn == 0xf)
745 goto undef;
746 /* FALL THROUGH */
747 case 0:
748 break;
749 default:
750 goto undef;
751 }
752
753 if (rn != 0xf)
754 sprintf(cp, "SMML%c%s%s\tr%d, r%d, r%d, r%d",
755 (opcode & (1 << 6)) ? 'S' : 'A',
756 (opcode & (1 << 5)) ? "R" : "",
757 COND(opcode),
758 (int) (opcode >> 16) & 0xf,
759 (int) (opcode >> 0) & 0xf,
760 (int) (opcode >> 8) & 0xf,
761 rn);
762 else
763 sprintf(cp, "SMMUL%s%s\tr%d, r%d, r%d",
764 (opcode & (1 << 5)) ? "R" : "",
765 COND(opcode),
766 (int) (opcode >> 16) & 0xf,
767 (int) (opcode >> 0) & 0xf,
768 (int) (opcode >> 8) & 0xf);
769 return ERROR_OK;
770 }
771
772
773 /* simple matches against the remaining decode bits */
774 switch (opcode & 0x01f000f0) {
775 case 0x00a00030:
776 case 0x00e00030:
777 /* parallel halfword saturate */
778 sprintf(cp, "%cSAT16%s\tr%d, #%d, r%d",
779 (opcode & (1 << 22)) ? 'U' : 'S',
780 COND(opcode),
781 (int) (opcode >> 12) & 0xf,
782 (int) (opcode >> 16) & 0xf,
783 (int) (opcode >> 0) & 0xf);
784 return ERROR_OK;
785 case 0x00b00030:
786 mnemonic = "REV";
787 break;
788 case 0x00b000b0:
789 mnemonic = "REV16";
790 break;
791 case 0x00f000b0:
792 mnemonic = "REVSH";
793 break;
794 case 0x008000b0:
795 /* select bytes */
796 sprintf(cp, "SEL%s\tr%d, r%d, r%d", COND(opcode),
797 (int) (opcode >> 12) & 0xf,
798 (int) (opcode >> 16) & 0xf,
799 (int) (opcode >> 0) & 0xf);
800 return ERROR_OK;
801 case 0x01800010:
802 /* unsigned sum of absolute differences */
803 if (((opcode >> 12) & 0xf) == 0xf)
804 sprintf(cp, "USAD8%s\tr%d, r%d, r%d", COND(opcode),
805 (int) (opcode >> 16) & 0xf,
806 (int) (opcode >> 0) & 0xf,
807 (int) (opcode >> 8) & 0xf);
808 else
809 sprintf(cp, "USADA8%s\tr%d, r%d, r%d, r%d", COND(opcode),
810 (int) (opcode >> 16) & 0xf,
811 (int) (opcode >> 0) & 0xf,
812 (int) (opcode >> 8) & 0xf,
813 (int) (opcode >> 12) & 0xf);
814 return ERROR_OK;
815 }
816 if (mnemonic) {
817 unsigned rm = (opcode >> 0) & 0xf;
818 unsigned rd = (opcode >> 12) & 0xf;
819
820 sprintf(cp, "%s%s\tr%d, r%d", mnemonic, COND(opcode), rm, rd);
821 return ERROR_OK;
822 }
823
824 undef:
825 /* these opcodes might be used someday */
826 sprintf(cp, "UNDEFINED");
827 return ERROR_OK;
828 }
829
830 /* Miscellaneous load/store instructions */
831 static int evaluate_misc_load_store(uint32_t opcode,
832 uint32_t address, arm_instruction_t *instruction)
833 {
834 uint8_t P, U, I, W, L, S, H;
835 uint8_t Rn, Rd;
836 char *operation; /* "LDR" or "STR" */
837 char *suffix; /* "H", "SB", "SH", "D" */
838 char offset[32];
839
840 /* examine flags */
841 P = (opcode & 0x01000000) >> 24;
842 U = (opcode & 0x00800000) >> 23;
843 I = (opcode & 0x00400000) >> 22;
844 W = (opcode & 0x00200000) >> 21;
845 L = (opcode & 0x00100000) >> 20;
846 S = (opcode & 0x00000040) >> 6;
847 H = (opcode & 0x00000020) >> 5;
848
849 /* target register */
850 Rd = (opcode & 0xf000) >> 12;
851
852 /* base register */
853 Rn = (opcode & 0xf0000) >> 16;
854
855 instruction->info.load_store.Rd = Rd;
856 instruction->info.load_store.Rn = Rn;
857 instruction->info.load_store.U = U;
858
859 /* determine instruction type and suffix */
860 if (S) /* signed */
861 {
862 if (L) /* load */
863 {
864 if (H)
865 {
866 operation = "LDR";
867 instruction->type = ARM_LDRSH;
868 suffix = "SH";
869 }
870 else
871 {
872 operation = "LDR";
873 instruction->type = ARM_LDRSB;
874 suffix = "SB";
875 }
876 }
877 else /* there are no signed stores, so this is used to encode double-register load/stores */
878 {
879 suffix = "D";
880 if (H)
881 {
882 operation = "STR";
883 instruction->type = ARM_STRD;
884 }
885 else
886 {
887 operation = "LDR";
888 instruction->type = ARM_LDRD;
889 }
890 }
891 }
892 else /* unsigned */
893 {
894 suffix = "H";
895 if (L) /* load */
896 {
897 operation = "LDR";
898 instruction->type = ARM_LDRH;
899 }
900 else /* store */
901 {
902 operation = "STR";
903 instruction->type = ARM_STRH;
904 }
905 }
906
907 if (I) /* Immediate offset/index (#+-<offset_8>)*/
908 {
909 uint32_t offset_8 = ((opcode & 0xf00) >> 4) | (opcode & 0xf);
910 snprintf(offset, 32, "#%s0x%" PRIx32 "", (U) ? "" : "-", offset_8);
911
912 instruction->info.load_store.offset_mode = 0;
913 instruction->info.load_store.offset.offset = offset_8;
914 }
915 else /* Register offset/index (+-<Rm>) */
916 {
917 uint8_t Rm;
918 Rm = (opcode & 0xf);
919 snprintf(offset, 32, "%sr%i", (U) ? "" : "-", Rm);
920
921 instruction->info.load_store.offset_mode = 1;
922 instruction->info.load_store.offset.reg.Rm = Rm;
923 instruction->info.load_store.offset.reg.shift = 0x0;
924 instruction->info.load_store.offset.reg.shift_imm = 0x0;
925 }
926
927 if (P == 1)
928 {
929 if (W == 0) /* offset */
930 {
931 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i, %s]",
932 address, opcode, operation, COND(opcode), suffix,
933 Rd, Rn, offset);
934
935 instruction->info.load_store.index_mode = 0;
936 }
937 else /* pre-indexed */
938 {
939 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i, %s]!",
940 address, opcode, operation, COND(opcode), suffix,
941 Rd, Rn, offset);
942
943 instruction->info.load_store.index_mode = 1;
944 }
945 }
946 else /* post-indexed */
947 {
948 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i], %s",
949 address, opcode, operation, COND(opcode), suffix,
950 Rd, Rn, offset);
951
952 instruction->info.load_store.index_mode = 2;
953 }
954
955 return ERROR_OK;
956 }
957
958 /* Load/store multiples instructions */
959 static int evaluate_ldm_stm(uint32_t opcode,
960 uint32_t address, arm_instruction_t *instruction)
961 {
962 uint8_t P, U, S, W, L, Rn;
963 uint32_t register_list;
964 char *addressing_mode;
965 char *mnemonic;
966 char reg_list[69];
967 char *reg_list_p;
968 int i;
969 int first_reg = 1;
970
971 P = (opcode & 0x01000000) >> 24;
972 U = (opcode & 0x00800000) >> 23;
973 S = (opcode & 0x00400000) >> 22;
974 W = (opcode & 0x00200000) >> 21;
975 L = (opcode & 0x00100000) >> 20;
976 register_list = (opcode & 0xffff);
977 Rn = (opcode & 0xf0000) >> 16;
978
979 instruction->info.load_store_multiple.Rn = Rn;
980 instruction->info.load_store_multiple.register_list = register_list;
981 instruction->info.load_store_multiple.S = S;
982 instruction->info.load_store_multiple.W = W;
983
984 if (L)
985 {
986 instruction->type = ARM_LDM;
987 mnemonic = "LDM";
988 }
989 else
990 {
991 instruction->type = ARM_STM;
992 mnemonic = "STM";
993 }
994
995 if (P)
996 {
997 if (U)
998 {
999 instruction->info.load_store_multiple.addressing_mode = 1;
1000 addressing_mode = "IB";
1001 }
1002 else
1003 {
1004 instruction->info.load_store_multiple.addressing_mode = 3;
1005 addressing_mode = "DB";
1006 }
1007 }
1008 else
1009 {
1010 if (U)
1011 {
1012 instruction->info.load_store_multiple.addressing_mode = 0;
1013 /* "IA" is the default in UAL syntax */
1014 addressing_mode = "";
1015 }
1016 else
1017 {
1018 instruction->info.load_store_multiple.addressing_mode = 2;
1019 addressing_mode = "DA";
1020 }
1021 }
1022
1023 reg_list_p = reg_list;
1024 for (i = 0; i <= 15; i++)
1025 {
1026 if ((register_list >> i) & 1)
1027 {
1028 if (first_reg)
1029 {
1030 first_reg = 0;
1031 reg_list_p += snprintf(reg_list_p, (reg_list + 69 - reg_list_p), "r%i", i);
1032 }
1033 else
1034 {
1035 reg_list_p += snprintf(reg_list_p, (reg_list + 69 - reg_list_p), ", r%i", i);
1036 }
1037 }
1038 }
1039
1040 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i%s, {%s}%s",
1041 address, opcode, mnemonic, COND(opcode), addressing_mode,
1042 Rn, (W) ? "!" : "", reg_list, (S) ? "^" : "");
1043
1044 return ERROR_OK;
1045 }
1046
1047 /* Multiplies, extra load/stores */
1048 static int evaluate_mul_and_extra_ld_st(uint32_t opcode,
1049 uint32_t address, arm_instruction_t *instruction)
1050 {
1051 /* Multiply (accumulate) (long) and Swap/swap byte */
1052 if ((opcode & 0x000000f0) == 0x00000090)
1053 {
1054 /* Multiply (accumulate) */
1055 if ((opcode & 0x0f800000) == 0x00000000)
1056 {
1057 uint8_t Rm, Rs, Rn, Rd, S;
1058 Rm = opcode & 0xf;
1059 Rs = (opcode & 0xf00) >> 8;
1060 Rn = (opcode & 0xf000) >> 12;
1061 Rd = (opcode & 0xf0000) >> 16;
1062 S = (opcode & 0x00100000) >> 20;
1063
1064 /* examine A bit (accumulate) */
1065 if (opcode & 0x00200000)
1066 {
1067 instruction->type = ARM_MLA;
1068 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMLA%s%s r%i, r%i, r%i, r%i",
1069 address, opcode, COND(opcode), (S) ? "S" : "", Rd, Rm, Rs, Rn);
1070 }
1071 else
1072 {
1073 instruction->type = ARM_MUL;
1074 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMUL%s%s r%i, r%i, r%i",
1075 address, opcode, COND(opcode), (S) ? "S" : "", Rd, Rm, Rs);
1076 }
1077
1078 return ERROR_OK;
1079 }
1080
1081 /* Multiply (accumulate) long */
1082 if ((opcode & 0x0f800000) == 0x00800000)
1083 {
1084 char* mnemonic = NULL;
1085 uint8_t Rm, Rs, RdHi, RdLow, S;
1086 Rm = opcode & 0xf;
1087 Rs = (opcode & 0xf00) >> 8;
1088 RdHi = (opcode & 0xf000) >> 12;
1089 RdLow = (opcode & 0xf0000) >> 16;
1090 S = (opcode & 0x00100000) >> 20;
1091
1092 switch ((opcode & 0x00600000) >> 21)
1093 {
1094 case 0x0:
1095 instruction->type = ARM_UMULL;
1096 mnemonic = "UMULL";
1097 break;
1098 case 0x1:
1099 instruction->type = ARM_UMLAL;
1100 mnemonic = "UMLAL";
1101 break;
1102 case 0x2:
1103 instruction->type = ARM_SMULL;
1104 mnemonic = "SMULL";
1105 break;
1106 case 0x3:
1107 instruction->type = ARM_SMLAL;
1108 mnemonic = "SMLAL";
1109 break;
1110 }
1111
1112 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, r%i, r%i, r%i",
1113 address, opcode, mnemonic, COND(opcode), (S) ? "S" : "",
1114 RdLow, RdHi, Rm, Rs);
1115
1116 return ERROR_OK;
1117 }
1118
1119 /* Swap/swap byte */
1120 if ((opcode & 0x0f800000) == 0x01000000)
1121 {
1122 uint8_t Rm, Rd, Rn;
1123 Rm = opcode & 0xf;
1124 Rd = (opcode & 0xf000) >> 12;
1125 Rn = (opcode & 0xf0000) >> 16;
1126
1127 /* examine B flag */
1128 instruction->type = (opcode & 0x00400000) ? ARM_SWPB : ARM_SWP;
1129
1130 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, r%i, [r%i]",
1131 address, opcode, (opcode & 0x00400000) ? "SWPB" : "SWP", COND(opcode), Rd, Rm, Rn);
1132 return ERROR_OK;
1133 }
1134
1135 }
1136
1137 return evaluate_misc_load_store(opcode, address, instruction);
1138 }
1139
1140 static int evaluate_mrs_msr(uint32_t opcode,
1141 uint32_t address, arm_instruction_t *instruction)
1142 {
1143 int R = (opcode & 0x00400000) >> 22;
1144 char *PSR = (R) ? "SPSR" : "CPSR";
1145
1146 /* Move register to status register (MSR) */
1147 if (opcode & 0x00200000)
1148 {
1149 instruction->type = ARM_MSR;
1150
1151 /* immediate variant */
1152 if (opcode & 0x02000000)
1153 {
1154 uint8_t immediate = (opcode & 0xff);
1155 uint8_t rotate = (opcode & 0xf00);
1156
1157 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMSR%s %s_%s%s%s%s, 0x%8.8" PRIx32 ,
1158 address, opcode, COND(opcode), PSR,
1159 (opcode & 0x10000) ? "c" : "",
1160 (opcode & 0x20000) ? "x" : "",
1161 (opcode & 0x40000) ? "s" : "",
1162 (opcode & 0x80000) ? "f" : "",
1163 ror(immediate, (rotate * 2))
1164 );
1165 }
1166 else /* register variant */
1167 {
1168 uint8_t Rm = opcode & 0xf;
1169 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMSR%s %s_%s%s%s%s, r%i",
1170 address, opcode, COND(opcode), PSR,
1171 (opcode & 0x10000) ? "c" : "",
1172 (opcode & 0x20000) ? "x" : "",
1173 (opcode & 0x40000) ? "s" : "",
1174 (opcode & 0x80000) ? "f" : "",
1175 Rm
1176 );
1177 }
1178
1179 }
1180 else /* Move status register to register (MRS) */
1181 {
1182 uint8_t Rd;
1183
1184 instruction->type = ARM_MRS;
1185 Rd = (opcode & 0x0000f000) >> 12;
1186
1187 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMRS%s r%i, %s",
1188 address, opcode, COND(opcode), Rd, PSR);
1189 }
1190
1191 return ERROR_OK;
1192 }
1193
1194 /* Miscellaneous instructions */
1195 static int evaluate_misc_instr(uint32_t opcode,
1196 uint32_t address, arm_instruction_t *instruction)
1197 {
1198 /* MRS/MSR */
1199 if ((opcode & 0x000000f0) == 0x00000000)
1200 {
1201 evaluate_mrs_msr(opcode, address, instruction);
1202 }
1203
1204 /* BX */
1205 if ((opcode & 0x006000f0) == 0x00200010)
1206 {
1207 uint8_t Rm;
1208 instruction->type = ARM_BX;
1209 Rm = opcode & 0xf;
1210
1211 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBX%s r%i",
1212 address, opcode, COND(opcode), Rm);
1213
1214 instruction->info.b_bl_bx_blx.reg_operand = Rm;
1215 instruction->info.b_bl_bx_blx.target_address = -1;
1216 }
1217
1218 /* BXJ - "Jazelle" support (ARMv5-J) */
1219 if ((opcode & 0x006000f0) == 0x00200020)
1220 {
1221 uint8_t Rm;
1222 instruction->type = ARM_BX;
1223 Rm = opcode & 0xf;
1224
1225 snprintf(instruction->text, 128,
1226 "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBXJ%s r%i",
1227 address, opcode, COND(opcode), Rm);
1228
1229 instruction->info.b_bl_bx_blx.reg_operand = Rm;
1230 instruction->info.b_bl_bx_blx.target_address = -1;
1231 }
1232
1233 /* CLZ */
1234 if ((opcode & 0x006000f0) == 0x00600010)
1235 {
1236 uint8_t Rm, Rd;
1237 instruction->type = ARM_CLZ;
1238 Rm = opcode & 0xf;
1239 Rd = (opcode & 0xf000) >> 12;
1240
1241 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tCLZ%s r%i, r%i",
1242 address, opcode, COND(opcode), Rd, Rm);
1243 }
1244
1245 /* BLX(2) */
1246 if ((opcode & 0x006000f0) == 0x00200030)
1247 {
1248 uint8_t Rm;
1249 instruction->type = ARM_BLX;
1250 Rm = opcode & 0xf;
1251
1252 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBLX%s r%i",
1253 address, opcode, COND(opcode), Rm);
1254
1255 instruction->info.b_bl_bx_blx.reg_operand = Rm;
1256 instruction->info.b_bl_bx_blx.target_address = -1;
1257 }
1258
1259 /* Enhanced DSP add/subtracts */
1260 if ((opcode & 0x0000000f0) == 0x00000050)
1261 {
1262 uint8_t Rm, Rd, Rn;
1263 char *mnemonic = NULL;
1264 Rm = opcode & 0xf;
1265 Rd = (opcode & 0xf000) >> 12;
1266 Rn = (opcode & 0xf0000) >> 16;
1267
1268 switch ((opcode & 0x00600000) >> 21)
1269 {
1270 case 0x0:
1271 instruction->type = ARM_QADD;
1272 mnemonic = "QADD";
1273 break;
1274 case 0x1:
1275 instruction->type = ARM_QSUB;
1276 mnemonic = "QSUB";
1277 break;
1278 case 0x2:
1279 instruction->type = ARM_QDADD;
1280 mnemonic = "QDADD";
1281 break;
1282 case 0x3:
1283 instruction->type = ARM_QDSUB;
1284 mnemonic = "QDSUB";
1285 break;
1286 }
1287
1288 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, r%i, r%i",
1289 address, opcode, mnemonic, COND(opcode), Rd, Rm, Rn);
1290 }
1291
1292 /* Software breakpoints */
1293 if ((opcode & 0x0000000f0) == 0x00000070)
1294 {
1295 uint32_t immediate;
1296 instruction->type = ARM_BKPT;
1297 immediate = ((opcode & 0x000fff00) >> 4) | (opcode & 0xf);
1298
1299 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBKPT 0x%4.4" PRIx32 "",
1300 address, opcode, immediate);
1301 }
1302
1303 /* Enhanced DSP multiplies */
1304 if ((opcode & 0x000000090) == 0x00000080)
1305 {
1306 int x = (opcode & 0x20) >> 5;
1307 int y = (opcode & 0x40) >> 6;
1308
1309 /* SMLA < x><y> */
1310 if ((opcode & 0x00600000) == 0x00000000)
1311 {
1312 uint8_t Rd, Rm, Rs, Rn;
1313 instruction->type = ARM_SMLAxy;
1314 Rd = (opcode & 0xf0000) >> 16;
1315 Rm = (opcode & 0xf);
1316 Rs = (opcode & 0xf00) >> 8;
1317 Rn = (opcode & 0xf000) >> 12;
1318
1319 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLA%s%s%s r%i, r%i, r%i, r%i",
1320 address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
1321 Rd, Rm, Rs, Rn);
1322 }
1323
1324 /* SMLAL < x><y> */
1325 if ((opcode & 0x00600000) == 0x00400000)
1326 {
1327 uint8_t RdLow, RdHi, Rm, Rs;
1328 instruction->type = ARM_SMLAxy;
1329 RdHi = (opcode & 0xf0000) >> 16;
1330 RdLow = (opcode & 0xf000) >> 12;
1331 Rm = (opcode & 0xf);
1332 Rs = (opcode & 0xf00) >> 8;
1333
1334 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLA%s%s%s r%i, r%i, r%i, r%i",
1335 address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
1336 RdLow, RdHi, Rm, Rs);
1337 }
1338
1339 /* SMLAW < y> */
1340 if (((opcode & 0x00600000) == 0x00100000) && (x == 0))
1341 {
1342 uint8_t Rd, Rm, Rs, Rn;
1343 instruction->type = ARM_SMLAWy;
1344 Rd = (opcode & 0xf0000) >> 16;
1345 Rm = (opcode & 0xf);
1346 Rs = (opcode & 0xf00) >> 8;
1347 Rn = (opcode & 0xf000) >> 12;
1348
1349 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLAW%s%s r%i, r%i, r%i, r%i",
1350 address, opcode, (y) ? "T" : "B", COND(opcode),
1351 Rd, Rm, Rs, Rn);
1352 }
1353
1354 /* SMUL < x><y> */
1355 if ((opcode & 0x00600000) == 0x00300000)
1356 {
1357 uint8_t Rd, Rm, Rs;
1358 instruction->type = ARM_SMULxy;
1359 Rd = (opcode & 0xf0000) >> 16;
1360 Rm = (opcode & 0xf);
1361 Rs = (opcode & 0xf00) >> 8;
1362
1363 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMULW%s%s%s r%i, r%i, r%i",
1364 address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
1365 Rd, Rm, Rs);
1366 }
1367
1368 /* SMULW < y> */
1369 if (((opcode & 0x00600000) == 0x00100000) && (x == 1))
1370 {
1371 uint8_t Rd, Rm, Rs;
1372 instruction->type = ARM_SMULWy;
1373 Rd = (opcode & 0xf0000) >> 16;
1374 Rm = (opcode & 0xf);
1375 Rs = (opcode & 0xf00) >> 8;
1376
1377 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMULW%s%s r%i, r%i, r%i",
1378 address, opcode, (y) ? "T" : "B", COND(opcode),
1379 Rd, Rm, Rs);
1380 }
1381 }
1382
1383 return ERROR_OK;
1384 }
1385
1386 static int evaluate_data_proc(uint32_t opcode,
1387 uint32_t address, arm_instruction_t *instruction)
1388 {
1389 uint8_t I, op, S, Rn, Rd;
1390 char *mnemonic = NULL;
1391 char shifter_operand[32];
1392
1393 I = (opcode & 0x02000000) >> 25;
1394 op = (opcode & 0x01e00000) >> 21;
1395 S = (opcode & 0x00100000) >> 20;
1396
1397 Rd = (opcode & 0xf000) >> 12;
1398 Rn = (opcode & 0xf0000) >> 16;
1399
1400 instruction->info.data_proc.Rd = Rd;
1401 instruction->info.data_proc.Rn = Rn;
1402 instruction->info.data_proc.S = S;
1403
1404 switch (op)
1405 {
1406 case 0x0:
1407 instruction->type = ARM_AND;
1408 mnemonic = "AND";
1409 break;
1410 case 0x1:
1411 instruction->type = ARM_EOR;
1412 mnemonic = "EOR";
1413 break;
1414 case 0x2:
1415 instruction->type = ARM_SUB;
1416 mnemonic = "SUB";
1417 break;
1418 case 0x3:
1419 instruction->type = ARM_RSB;
1420 mnemonic = "RSB";
1421 break;
1422 case 0x4:
1423 instruction->type = ARM_ADD;
1424 mnemonic = "ADD";
1425 break;
1426 case 0x5:
1427 instruction->type = ARM_ADC;
1428 mnemonic = "ADC";
1429 break;
1430 case 0x6:
1431 instruction->type = ARM_SBC;
1432 mnemonic = "SBC";
1433 break;
1434 case 0x7:
1435 instruction->type = ARM_RSC;
1436 mnemonic = "RSC";
1437 break;
1438 case 0x8:
1439 instruction->type = ARM_TST;
1440 mnemonic = "TST";
1441 break;
1442 case 0x9:
1443 instruction->type = ARM_TEQ;
1444 mnemonic = "TEQ";
1445 break;
1446 case 0xa:
1447 instruction->type = ARM_CMP;
1448 mnemonic = "CMP";
1449 break;
1450 case 0xb:
1451 instruction->type = ARM_CMN;
1452 mnemonic = "CMN";
1453 break;
1454 case 0xc:
1455 instruction->type = ARM_ORR;
1456 mnemonic = "ORR";
1457 break;
1458 case 0xd:
1459 instruction->type = ARM_MOV;
1460 mnemonic = "MOV";
1461 break;
1462 case 0xe:
1463 instruction->type = ARM_BIC;
1464 mnemonic = "BIC";
1465 break;
1466 case 0xf:
1467 instruction->type = ARM_MVN;
1468 mnemonic = "MVN";
1469 break;
1470 }
1471
1472 if (I) /* immediate shifter operand (#<immediate>)*/
1473 {
1474 uint8_t immed_8 = opcode & 0xff;
1475 uint8_t rotate_imm = (opcode & 0xf00) >> 8;
1476 uint32_t immediate;
1477
1478 immediate = ror(immed_8, rotate_imm * 2);
1479
1480 snprintf(shifter_operand, 32, "#0x%" PRIx32 "", immediate);
1481
1482 instruction->info.data_proc.variant = 0;
1483 instruction->info.data_proc.shifter_operand.immediate.immediate = immediate;
1484 }
1485 else /* register-based shifter operand */
1486 {
1487 uint8_t shift, Rm;
1488 shift = (opcode & 0x60) >> 5;
1489 Rm = (opcode & 0xf);
1490
1491 if ((opcode & 0x10) != 0x10) /* Immediate shifts ("<Rm>" or "<Rm>, <shift> #<shift_immediate>") */
1492 {
1493 uint8_t shift_imm;
1494 shift_imm = (opcode & 0xf80) >> 7;
1495
1496 instruction->info.data_proc.variant = 1;
1497 instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
1498 instruction->info.data_proc.shifter_operand.immediate_shift.shift_imm = shift_imm;
1499 instruction->info.data_proc.shifter_operand.immediate_shift.shift = shift;
1500
1501 /* LSR encodes a shift by 32 bit as 0x0 */
1502 if ((shift == 0x1) && (shift_imm == 0x0))
1503 shift_imm = 0x20;
1504
1505 /* ASR encodes a shift by 32 bit as 0x0 */
1506 if ((shift == 0x2) && (shift_imm == 0x0))
1507 shift_imm = 0x20;
1508
1509 /* ROR by 32 bit is actually a RRX */
1510 if ((shift == 0x3) && (shift_imm == 0x0))
1511 shift = 0x4;
1512
1513 if ((shift_imm == 0x0) && (shift == 0x0))
1514 {
1515 snprintf(shifter_operand, 32, "r%i", Rm);
1516 }
1517 else
1518 {
1519 if (shift == 0x0) /* LSL */
1520 {
1521 snprintf(shifter_operand, 32, "r%i, LSL #0x%x", Rm, shift_imm);
1522 }
1523 else if (shift == 0x1) /* LSR */
1524 {
1525 snprintf(shifter_operand, 32, "r%i, LSR #0x%x", Rm, shift_imm);
1526 }
1527 else if (shift == 0x2) /* ASR */
1528 {
1529 snprintf(shifter_operand, 32, "r%i, ASR #0x%x", Rm, shift_imm);
1530 }
1531 else if (shift == 0x3) /* ROR */
1532 {
1533 snprintf(shifter_operand, 32, "r%i, ROR #0x%x", Rm, shift_imm);
1534 }
1535 else if (shift == 0x4) /* RRX */
1536 {
1537 snprintf(shifter_operand, 32, "r%i, RRX", Rm);
1538 }
1539 }
1540 }
1541 else /* Register shifts ("<Rm>, <shift> <Rs>") */
1542 {
1543 uint8_t Rs = (opcode & 0xf00) >> 8;
1544
1545 instruction->info.data_proc.variant = 2;
1546 instruction->info.data_proc.shifter_operand.register_shift.Rm = Rm;
1547 instruction->info.data_proc.shifter_operand.register_shift.Rs = Rs;
1548 instruction->info.data_proc.shifter_operand.register_shift.shift = shift;
1549
1550 if (shift == 0x0) /* LSL */
1551 {
1552 snprintf(shifter_operand, 32, "r%i, LSL r%i", Rm, Rs);
1553 }
1554 else if (shift == 0x1) /* LSR */
1555 {
1556 snprintf(shifter_operand, 32, "r%i, LSR r%i", Rm, Rs);
1557 }
1558 else if (shift == 0x2) /* ASR */
1559 {
1560 snprintf(shifter_operand, 32, "r%i, ASR r%i", Rm, Rs);
1561 }
1562 else if (shift == 0x3) /* ROR */
1563 {
1564 snprintf(shifter_operand, 32, "r%i, ROR r%i", Rm, Rs);
1565 }
1566 }
1567 }
1568
1569 if ((op < 0x8) || (op == 0xc) || (op == 0xe)) /* <opcode3>{<cond>}{S} <Rd>, <Rn>, <shifter_operand> */
1570 {
1571 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, r%i, %s",
1572 address, opcode, mnemonic, COND(opcode),
1573 (S) ? "S" : "", Rd, Rn, shifter_operand);
1574 }
1575 else if ((op == 0xd) || (op == 0xf)) /* <opcode1>{<cond>}{S} <Rd>, <shifter_operand> */
1576 {
1577 if (opcode == 0xe1a00000) /* print MOV r0,r0 as NOP */
1578 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tNOP",address, opcode);
1579 else
1580 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, %s",
1581 address, opcode, mnemonic, COND(opcode),
1582 (S) ? "S" : "", Rd, shifter_operand);
1583 }
1584 else /* <opcode2>{<cond>} <Rn>, <shifter_operand> */
1585 {
1586 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, %s",
1587 address, opcode, mnemonic, COND(opcode),
1588 Rn, shifter_operand);
1589 }
1590
1591 return ERROR_OK;
1592 }
1593
1594 int arm_evaluate_opcode(uint32_t opcode, uint32_t address, arm_instruction_t *instruction)
1595 {
1596 /* clear fields, to avoid confusion */
1597 memset(instruction, 0, sizeof(arm_instruction_t));
1598 instruction->opcode = opcode;
1599 instruction->instruction_size = 4;
1600
1601 /* catch opcodes with condition field [31:28] = b1111 */
1602 if ((opcode & 0xf0000000) == 0xf0000000)
1603 {
1604 /* Undefined instruction (or ARMv5E cache preload PLD) */
1605 if ((opcode & 0x08000000) == 0x00000000)
1606 return evaluate_pld(opcode, address, instruction);
1607
1608 /* Undefined instruction */
1609 if ((opcode & 0x0e000000) == 0x08000000)
1610 {
1611 instruction->type = ARM_UNDEFINED_INSTRUCTION;
1612 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEFINED INSTRUCTION", address, opcode);
1613 return ERROR_OK;
1614 }
1615
1616 /* Branch and branch with link and change to Thumb */
1617 if ((opcode & 0x0e000000) == 0x0a000000)
1618 return evaluate_blx_imm(opcode, address, instruction);
1619
1620 /* Extended coprocessor opcode space (ARMv5 and higher)*/
1621 /* Coprocessor load/store and double register transfers */
1622 if ((opcode & 0x0e000000) == 0x0c000000)
1623 return evaluate_ldc_stc_mcrr_mrrc(opcode, address, instruction);
1624
1625 /* Coprocessor data processing */
1626 if ((opcode & 0x0f000100) == 0x0c000000)
1627 return evaluate_cdp_mcr_mrc(opcode, address, instruction);
1628
1629 /* Coprocessor register transfers */
1630 if ((opcode & 0x0f000010) == 0x0c000010)
1631 return evaluate_cdp_mcr_mrc(opcode, address, instruction);
1632
1633 /* Undefined instruction */
1634 if ((opcode & 0x0f000000) == 0x0f000000)
1635 {
1636 instruction->type = ARM_UNDEFINED_INSTRUCTION;
1637 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEFINED INSTRUCTION", address, opcode);
1638 return ERROR_OK;
1639 }
1640 }
1641
1642 /* catch opcodes with [27:25] = b000 */
1643 if ((opcode & 0x0e000000) == 0x00000000)
1644 {
1645 /* Multiplies, extra load/stores */
1646 if ((opcode & 0x00000090) == 0x00000090)
1647 return evaluate_mul_and_extra_ld_st(opcode, address, instruction);
1648
1649 /* Miscellaneous instructions */
1650 if ((opcode & 0x0f900000) == 0x01000000)
1651 return evaluate_misc_instr(opcode, address, instruction);
1652
1653 return evaluate_data_proc(opcode, address, instruction);
1654 }
1655
1656 /* catch opcodes with [27:25] = b001 */
1657 if ((opcode & 0x0e000000) == 0x02000000)
1658 {
1659 /* Undefined instruction */
1660 if ((opcode & 0x0fb00000) == 0x03000000)
1661 {
1662 instruction->type = ARM_UNDEFINED_INSTRUCTION;
1663 snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEFINED INSTRUCTION", address, opcode);
1664 return ERROR_OK;
1665 }
1666
1667 /* Move immediate to status register */
1668 if ((opcode & 0x0fb00000) == 0x03200000)
1669 return evaluate_mrs_msr(opcode, address, instruction);
1670
1671 return evaluate_data_proc(opcode, address, instruction);
1672
1673 }
1674
1675 /* catch opcodes with [27:25] = b010 */
1676 if ((opcode & 0x0e000000) == 0x04000000)
1677 {
1678 /* Load/store immediate offset */
1679 return evaluate_load_store(opcode, address, instruction);
1680 }
1681
1682 /* catch opcodes with [27:25] = b011 */
1683 if ((opcode & 0x0e000000) == 0x06000000)
1684 {
1685 /* Load/store register offset */
1686 if ((opcode & 0x00000010) == 0x00000000)
1687 return evaluate_load_store(opcode, address, instruction);
1688
1689 /* Architecturally Undefined instruction
1690 * ... don't expect these to ever be used
1691 */
1692 if ((opcode & 0x07f000f0) == 0x07f000f0)
1693 {
1694 instruction->type = ARM_UNDEFINED_INSTRUCTION;
1695 snprintf(instruction->text, 128,
1696 "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEF",
1697 address, opcode);
1698 return ERROR_OK;
1699 }
1700
1701 /* "media" instructions */
1702 return evaluate_media(opcode, address, instruction);
1703 }
1704
1705 /* catch opcodes with [27:25] = b100 */
1706 if ((opcode & 0x0e000000) == 0x08000000)
1707 {
1708 /* Load/store multiple */
1709 return evaluate_ldm_stm(opcode, address, instruction);
1710 }
1711
1712 /* catch opcodes with [27:25] = b101 */
1713 if ((opcode & 0x0e000000) == 0x0a000000)
1714 {
1715 /* Branch and branch with link */
1716 return evaluate_b_bl(opcode, address, instruction);
1717 }
1718
1719 /* catch opcodes with [27:25] = b110 */
1720 if ((opcode & 0x0e000000) == 0x0a000000)
1721 {
1722 /* Coprocessor load/store and double register transfers */
1723 return evaluate_ldc_stc_mcrr_mrrc(opcode, address, instruction);
1724 }
1725
1726 /* catch opcodes with [27:25] = b111 */
1727 if ((opcode & 0x0e000000) == 0x0e000000)
1728 {
1729 /* Software interrupt */
1730 if ((opcode & 0x0f000000) == 0x0f000000)
1731 return evaluate_swi(opcode, address, instruction);
1732
1733 /* Coprocessor data processing */
1734 if ((opcode & 0x0f000010) == 0x0e000000)
1735 return evaluate_cdp_mcr_mrc(opcode, address, instruction);
1736
1737 /* Coprocessor register transfers */
1738 if ((opcode & 0x0f000010) == 0x0e000010)
1739 return evaluate_cdp_mcr_mrc(opcode, address, instruction);
1740 }
1741
1742 LOG_ERROR("should never reach this point");
1743 return -1;
1744 }
1745
1746 static int evaluate_b_bl_blx_thumb(uint16_t opcode,
1747 uint32_t address, arm_instruction_t *instruction)
1748 {
1749 uint32_t offset = opcode & 0x7ff;
1750 uint32_t opc = (opcode >> 11) & 0x3;
1751 uint32_t target_address;
1752 char *mnemonic = NULL;
1753
1754 /* sign extend 11-bit offset */
1755 if (((opc == 0) || (opc == 2)) && (offset & 0x00000400))
1756 offset = 0xfffff800 | offset;
1757
1758 target_address = address + 4 + (offset << 1);
1759
1760 switch (opc)
1761 {
1762 /* unconditional branch */
1763 case 0:
1764 instruction->type = ARM_B;
1765 mnemonic = "B";
1766 break;
1767 /* BLX suffix */
1768 case 1:
1769 instruction->type = ARM_BLX;
1770 mnemonic = "BLX";
1771 target_address &= 0xfffffffc;
1772 break;
1773 /* BL/BLX prefix */
1774 case 2:
1775 instruction->type = ARM_UNKNOWN_INSTUCTION;
1776 mnemonic = "prefix";
1777 target_address = offset << 12;
1778 break;
1779 /* BL suffix */
1780 case 3:
1781 instruction->type = ARM_BL;
1782 mnemonic = "BL";
1783 break;
1784 }
1785
1786 /* TODO: deal correctly with dual opcode (prefixed) BL/BLX;
1787 * these are effectively 32-bit instructions even in Thumb1.
1788 * Might be simplest to always use the Thumb2 decoder.
1789 */
1790
1791 snprintf(instruction->text, 128,
1792 "0x%8.8" PRIx32 " 0x%4.4x \t%s\t%#8.8" PRIx32,
1793 address, opcode, mnemonic, target_address);
1794
1795 instruction->info.b_bl_bx_blx.reg_operand = -1;
1796 instruction->info.b_bl_bx_blx.target_address = target_address;
1797
1798 return ERROR_OK;
1799 }
1800
1801 static int evaluate_add_sub_thumb(uint16_t opcode,
1802 uint32_t address, arm_instruction_t *instruction)
1803 {
1804 uint8_t Rd = (opcode >> 0) & 0x7;
1805 uint8_t Rn = (opcode >> 3) & 0x7;
1806 uint8_t Rm_imm = (opcode >> 6) & 0x7;
1807 uint32_t opc = opcode & (1 << 9);
1808 uint32_t reg_imm = opcode & (1 << 10);
1809 char *mnemonic;
1810
1811 if (opc)
1812 {
1813 instruction->type = ARM_SUB;
1814 mnemonic = "SUBS";
1815 }
1816 else
1817 {
1818 /* REVISIT: if reg_imm == 0, display as "MOVS" */
1819 instruction->type = ARM_ADD;
1820 mnemonic = "ADDS";
1821 }
1822
1823 instruction->info.data_proc.Rd = Rd;
1824 instruction->info.data_proc.Rn = Rn;
1825 instruction->info.data_proc.S = 1;
1826
1827 if (reg_imm)
1828 {
1829 instruction->info.data_proc.variant = 0; /*immediate*/
1830 instruction->info.data_proc.shifter_operand.immediate.immediate = Rm_imm;
1831 snprintf(instruction->text, 128,
1832 "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, #%d",
1833 address, opcode, mnemonic, Rd, Rn, Rm_imm);
1834 }
1835 else
1836 {
1837 instruction->info.data_proc.variant = 1; /*immediate shift*/
1838 instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm_imm;
1839 snprintf(instruction->text, 128,
1840 "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, r%i",
1841 address, opcode, mnemonic, Rd, Rn, Rm_imm);
1842 }
1843
1844 return ERROR_OK;
1845 }
1846
1847 static int evaluate_shift_imm_thumb(uint16_t opcode,
1848 uint32_t address, arm_instruction_t *instruction)
1849 {
1850 uint8_t Rd = (opcode >> 0) & 0x7;
1851 uint8_t Rm = (opcode >> 3) & 0x7;
1852 uint8_t imm = (opcode >> 6) & 0x1f;
1853 uint8_t opc = (opcode >> 11) & 0x3;
1854 char *mnemonic = NULL;
1855
1856 switch (opc)
1857 {
1858 case 0:
1859 instruction->type = ARM_MOV;
1860 mnemonic = "LSLS";
1861 instruction->info.data_proc.shifter_operand.immediate_shift.shift = 0;
1862 break;
1863 case 1:
1864 instruction->type = ARM_MOV;
1865 mnemonic = "LSRS";
1866 instruction->info.data_proc.shifter_operand.immediate_shift.shift = 1;
1867 break;
1868 case 2:
1869 instruction->type = ARM_MOV;
1870 mnemonic = "ASRS";
1871 instruction->info.data_proc.shifter_operand.immediate_shift.shift = 2;
1872 break;
1873 }
1874
1875 if ((imm == 0) && (opc != 0))
1876 imm = 32;
1877
1878 instruction->info.data_proc.Rd = Rd;
1879 instruction->info.data_proc.Rn = -1;
1880 instruction->info.data_proc.S = 1;
1881
1882 instruction->info.data_proc.variant = 1; /*immediate_shift*/
1883 instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
1884 instruction->info.data_proc.shifter_operand.immediate_shift.shift_imm = imm;
1885
1886 snprintf(instruction->text, 128,
1887 "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, #%#2.2x" ,
1888 address, opcode, mnemonic, Rd, Rm, imm);
1889
1890 return ERROR_OK;
1891 }
1892
1893 static int evaluate_data_proc_imm_thumb(uint16_t opcode,
1894 uint32_t address, arm_instruction_t *instruction)
1895 {
1896 uint8_t imm = opcode & 0xff;
1897 uint8_t Rd = (opcode >> 8) & 0x7;
1898 uint32_t opc = (opcode >> 11) & 0x3;
1899 char *mnemonic = NULL;
1900
1901 instruction->info.data_proc.Rd = Rd;
1902 instruction->info.data_proc.Rn = Rd;
1903 instruction->info.data_proc.S = 1;
1904 instruction->info.data_proc.variant = 0; /*immediate*/
1905 instruction->info.data_proc.shifter_operand.immediate.immediate = imm;
1906
1907 switch (opc)
1908 {
1909 case 0:
1910 instruction->type = ARM_MOV;
1911 mnemonic = "MOVS";
1912 instruction->info.data_proc.Rn = -1;
1913 break;
1914 case 1:
1915 instruction->type = ARM_CMP;
1916 mnemonic = "CMP";
1917 instruction->info.data_proc.Rd = -1;
1918 break;
1919 case 2:
1920 instruction->type = ARM_ADD;
1921 mnemonic = "ADDS";
1922 break;
1923 case 3:
1924 instruction->type = ARM_SUB;
1925 mnemonic = "SUBS";
1926 break;
1927 }
1928
1929 snprintf(instruction->text, 128,
1930 "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, #%#2.2x",
1931 address, opcode, mnemonic, Rd, imm);
1932
1933 return ERROR_OK;
1934 }
1935
1936 static int evaluate_data_proc_thumb(uint16_t opcode,
1937 uint32_t address, arm_instruction_t *instruction)
1938 {
1939 uint8_t high_reg, op, Rm, Rd,H1,H2;
1940 char *mnemonic = NULL;
1941 bool nop = false;
1942
1943 high_reg = (opcode & 0x0400) >> 10;
1944 op = (opcode & 0x03C0) >> 6;
1945
1946 Rd = (opcode & 0x0007);
1947 Rm = (opcode & 0x0038) >> 3;
1948 H1 = (opcode & 0x0080) >> 7;
1949 H2 = (opcode & 0x0040) >> 6;
1950
1951 instruction->info.data_proc.Rd = Rd;
1952 instruction->info.data_proc.Rn = Rd;
1953 instruction->info.data_proc.S = (!high_reg || (instruction->type == ARM_CMP));
1954 instruction->info.data_proc.variant = 1 /*immediate shift*/;
1955 instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
1956
1957 if (high_reg)
1958 {
1959 Rd |= H1 << 3;
1960 Rm |= H2 << 3;
1961 op >>= 2;
1962
1963 switch (op)
1964 {
1965 case 0x0:
1966 instruction->type = ARM_ADD;
1967 mnemonic = "ADD";
1968 break;
1969 case 0x1:
1970 instruction->type = ARM_CMP;
1971 mnemonic = "CMP";
1972 break;
1973 case 0x2:
1974 instruction->type = ARM_MOV;
1975 mnemonic = "MOV";
1976 if (Rd == Rm)
1977 nop = true;
1978 break;
1979 case 0x3:
1980 if ((opcode & 0x7) == 0x0)
1981 {
1982 instruction->info.b_bl_bx_blx.reg_operand = Rm;
1983 if (H1)
1984 {
1985 instruction->type = ARM_BLX;
1986 snprintf(instruction->text, 128,
1987 "0x%8.8" PRIx32
1988 " 0x%4.4x \tBLX\tr%i",
1989 address, opcode, Rm);
1990 }
1991 else
1992 {
1993 instruction->type = ARM_BX;
1994 snprintf(instruction->text, 128,
1995 "0x%8.8" PRIx32
1996 " 0x%4.4x \tBX\tr%i",
1997 address, opcode, Rm);
1998 }
1999 }
2000 else
2001 {
2002 instruction->type = ARM_UNDEFINED_INSTRUCTION;
2003 snprintf(instruction->text, 128,
2004 "0x%8.8" PRIx32
2005 " 0x%4.4x \t"
2006 "UNDEFINED INSTRUCTION",
2007 address, opcode);
2008 }
2009 return ERROR_OK;
2010 break;
2011 }
2012 }
2013 else
2014 {
2015 switch (op)
2016 {
2017 case 0x0:
2018 instruction->type = ARM_AND;
2019 mnemonic = "ANDS";
2020 break;
2021 case 0x1:
2022 instruction->type = ARM_EOR;
2023 mnemonic = "EORS";
2024 break;
2025 case 0x2:
2026 instruction->type = ARM_MOV;
2027 mnemonic = "LSLS";
2028 instruction->info.data_proc.variant = 2 /*register shift*/;
2029 instruction->info.data_proc.shifter_operand.register_shift.shift = 0;
2030 instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
2031 instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
2032 break;
2033 case 0x3:
2034 instruction->type = ARM_MOV;
2035 mnemonic = "LSRS";
2036 instruction->info.data_proc.variant = 2 /*register shift*/;
2037 instruction->info.data_proc.shifter_operand.register_shift.shift = 1;
2038 instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
2039 instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
2040 break;
2041 case 0x4:
2042 instruction->type = ARM_MOV;
2043 mnemonic = "ASRS";
2044 instruction->info.data_proc.variant = 2 /*register shift*/;
2045 instruction->info.data_proc.shifter_operand.register_shift.shift = 2;
2046 instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
2047 instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
2048 break;
2049 case 0x5:
2050 instruction->type = ARM_ADC;
2051 mnemonic = "ADCS";
2052 break;
2053 case 0x6:
2054 instruction->type = ARM_SBC;
2055 mnemonic = "SBCS";
2056 break;
2057 case 0x7:
2058 instruction->type = ARM_MOV;
2059 mnemonic = "RORS";
2060 instruction->info.data_proc.variant = 2 /*register shift*/;
2061 instruction->info.data_proc.shifter_operand.register_shift.shift = 3;
2062 instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
2063 instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
2064 break;
2065 case 0x8:
2066 instruction->type = ARM_TST;
2067 mnemonic = "TST";
2068 break;
2069 case 0x9:
2070 instruction->type = ARM_RSB;
2071 mnemonic = "RSBS";
2072 instruction->info.data_proc.variant = 0 /*immediate*/;
2073 instruction->info.data_proc.shifter_operand.immediate.immediate = 0;
2074 instruction->info.data_proc.Rn = Rm;
2075 break;
2076 case 0xA:
2077 instruction->type = ARM_CMP;
2078 mnemonic = "CMP";
2079 break;
2080 case 0xB:
2081 instruction->type = ARM_CMN;
2082 mnemonic = "CMN";
2083 break;
2084 case 0xC:
2085 instruction->type = ARM_ORR;
2086 mnemonic = "ORRS";
2087 break;
2088 case 0xD:
2089 instruction->type = ARM_MUL;
2090 mnemonic = "MULS";
2091 break;
2092 case 0xE:
2093 instruction->type = ARM_BIC;
2094 mnemonic = "BICS";
2095 break;
2096 case 0xF:
2097 instruction->type = ARM_MVN;
2098 mnemonic = "MVNS";
2099 break;
2100 }
2101 }
2102
2103 if (nop)
2104 snprintf(instruction->text, 128,
2105 "0x%8.8" PRIx32 " 0x%4.4x \tNOP\t\t\t"
2106 "; (%s r%i, r%i)",
2107 address, opcode, mnemonic, Rd, Rm);
2108 else
2109 snprintf(instruction->text, 128,
2110 "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i",
2111 address, opcode, mnemonic, Rd, Rm);
2112
2113 return ERROR_OK;
2114 }
2115
2116 /* PC-relative data addressing is word-aligned even with Thumb */
2117 static inline uint32_t thumb_alignpc4(uint32_t addr)
2118 {
2119 return (addr + 4) & ~3;
2120 }
2121
2122 static int evaluate_load_literal_thumb(uint16_t opcode,
2123 uint32_t address, arm_instruction_t *instruction)
2124 {
2125 uint32_t immediate;
2126 uint8_t Rd = (opcode >> 8) & 0x7;
2127
2128 instruction->type = ARM_LDR;
2129 immediate = opcode & 0x000000ff;
2130 immediate *= 4;
2131
2132 instruction->info.load_store.Rd = Rd;
2133 instruction->info.load_store.Rn = 15 /*PC*/;
2134 instruction->info.load_store.index_mode = 0; /*offset*/
2135 instruction->info.load_store.offset_mode = 0; /*immediate*/
2136 instruction->info.load_store.offset.offset = immediate;
2137
2138 snprintf(instruction->text, 128,
2139 "0x%8.8" PRIx32 " 0x%4.4x \t"
2140 "LDR\tr%i, [pc, #%#" PRIx32 "]\t; %#8.8" PRIx32,
2141 address, opcode, Rd, immediate,
2142 thumb_alignpc4(address) + immediate);
2143
2144 return ERROR_OK;
2145 }
2146
2147 static int evaluate_load_store_reg_thumb(uint16_t opcode,
2148 uint32_t address, arm_instruction_t *instruction)
2149 {
2150 uint8_t Rd = (opcode >> 0) & 0x7;
2151 uint8_t Rn = (opcode >> 3) & 0x7;
2152 uint8_t Rm = (opcode >> 6) & 0x7;
2153 uint8_t opc = (opcode >> 9) & 0x7;
2154 char *mnemonic = NULL;
2155
2156 switch (opc)
2157 {
2158 case 0:
2159 instruction->type = ARM_STR;
2160 mnemonic = "STR";
2161 break;
2162 case 1:
2163 instruction->type = ARM_STRH;
2164 mnemonic = "STRH";
2165 break;
2166 case 2:
2167 instruction->type = ARM_STRB;
2168 mnemonic = "STRB";
2169 break;
2170 case 3:
2171 instruction->type = ARM_LDRSB;
2172 mnemonic = "LDRSB";
2173 break;
2174 case 4:
2175 instruction->type = ARM_LDR;
2176 mnemonic = "LDR";
2177 break;
2178 case 5:
2179 instruction->type = ARM_LDRH;
2180 mnemonic = "LDRH";
2181 break;
2182 case 6:
2183 instruction->type = ARM_LDRB;
2184 mnemonic = "LDRB";
2185 break;
2186 case 7:
2187 instruction->type = ARM_LDRSH;
2188 mnemonic = "LDRSH";
2189 break;
2190 }
2191
2192 snprintf(instruction->text, 128,
2193 "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, [r%i, r%i]",
2194 address, opcode, mnemonic, Rd, Rn, Rm);
2195
2196 instruction->info.load_store.Rd = Rd;
2197 instruction->info.load_store.Rn = Rn;
2198 instruction->info.load_store.index_mode = 0; /*offset*/
2199 instruction->info.load_store.offset_mode = 1; /*register*/
2200 instruction->info.load_store.offset.reg.Rm = Rm;
2201
2202 return ERROR_OK;
2203 }
2204
2205 static int evaluate_load_store_imm_thumb(uint16_t opcode,
2206 uint32_t address, arm_instruction_t *instruction)
2207 {
2208 uint32_t offset = (opcode >> 6) & 0x1f;
2209 uint8_t Rd = (opcode >> 0) & 0x7;
2210 uint8_t Rn = (opcode >> 3) & 0x7;
2211 uint32_t L = opcode & (1 << 11);
2212 uint32_t B = opcode & (1 << 12);
2213 char *mnemonic;
2214 char suffix = ' ';
2215 uint32_t shift = 2;
2216
2217 if (L)
2218 {
2219 instruction->type = ARM_LDR;
2220 mnemonic = "LDR";
2221 }
2222 else
2223 {
2224 instruction->type = ARM_STR;
2225 mnemonic = "STR";
2226 }
2227
2228 if ((opcode&0xF000) == 0x8000)
2229 {
2230 suffix = 'H';
2231 shift = 1;
2232 }
2233 else if (B)
2234 {
2235 suffix = 'B';
2236 shift = 0;
2237 }
2238
2239 snprintf(instruction->text, 128,
2240 "0x%8.8" PRIx32 " 0x%4.4x \t%s%c\tr%i, [r%i, #%#" PRIx32 "]",
2241 address, opcode, mnemonic, suffix, Rd, Rn, offset << shift);
2242
2243 instruction->info.load_store.Rd = Rd;
2244 instruction->info.load_store.Rn = Rn;
2245 instruction->info.load_store.index_mode = 0; /*offset*/
2246 instruction->info.load_store.offset_mode = 0; /*immediate*/
2247 instruction->info.load_store.offset.offset = offset << shift;
2248
2249 return ERROR_OK;
2250 }
2251
2252 static int evaluate_load_store_stack_thumb(uint16_t opcode,
2253 uint32_t address, arm_instruction_t *instruction)
2254 {
2255 uint32_t offset = opcode & 0xff;
2256 uint8_t Rd = (opcode >> 8) & 0x7;
2257 uint32_t L = opcode & (1 << 11);
2258 char *mnemonic;
2259
2260 if (L)
2261 {
2262 instruction->type = ARM_LDR;
2263 mnemonic = "LDR";
2264 }
2265 else
2266 {
2267 instruction->type = ARM_STR;
2268 mnemonic = "STR";
2269 }
2270
2271 snprintf(instruction->text, 128,
2272 "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, [SP, #%#" PRIx32 "]",
2273 address, opcode, mnemonic, Rd, offset*4);
2274
2275 instruction->info.load_store.Rd = Rd;
2276 instruction->info.load_store.Rn = 13 /*SP*/;
2277 instruction->info.load_store.index_mode = 0; /*offset*/
2278 instruction->info.load_store.offset_mode = 0; /*immediate*/
2279 instruction->info.load_store.offset.offset = offset*4;
2280
2281 return ERROR_OK;
2282 }
2283
2284 static int evaluate_add_sp_pc_thumb(uint16_t opcode,
2285 uint32_t address, arm_instruction_t *instruction)
2286 {
2287 uint32_t imm = opcode & 0xff;
2288 uint8_t Rd = (opcode >> 8) & 0x7;
2289 uint8_t Rn;
2290 uint32_t SP = opcode & (1 << 11);
2291 char *reg_name;
2292
2293 instruction->type = ARM_ADD;
2294
2295 if (SP)
2296 {
2297 reg_name = "SP";
2298 Rn = 13;
2299 }
2300 else
2301 {
2302 reg_name = "PC";
2303 Rn = 15;
2304 }
2305
2306 snprintf(instruction->text, 128,
2307 "0x%8.8" PRIx32 " 0x%4.4x \tADD\tr%i, %s, #%#" PRIx32,
2308 address, opcode, Rd, reg_name, imm * 4);
2309
2310 instruction->info.data_proc.variant = 0 /* immediate */;
2311 instruction->info.data_proc.Rd = Rd;
2312 instruction->info.data_proc.Rn = Rn;
2313 instruction->info.data_proc.shifter_operand.immediate.immediate = imm*4;
2314
2315 return ERROR_OK;
2316 }
2317
2318 static int evaluate_adjust_stack_thumb(uint16_t opcode,
2319 uint32_t address, arm_instruction_t *instruction)
2320 {
2321 uint32_t imm = opcode & 0x7f;
2322 uint8_t opc = opcode & (1 << 7);
2323 char *mnemonic;
2324
2325
2326 if (opc)
2327 {
2328 instruction->type = ARM_SUB;
2329 mnemonic = "SUB";
2330 }
2331 else
2332 {
2333 instruction->type = ARM_ADD;
2334 mnemonic = "ADD";
2335 }
2336
2337 snprintf(instruction->text, 128,
2338 "0x%8.8" PRIx32 " 0x%4.4x \t%s\tSP, #%#" PRIx32,
2339 address, opcode, mnemonic, imm*4);
2340
2341 instruction->info.data_proc.variant = 0 /* immediate */;
2342 instruction->info.data_proc.Rd = 13 /*SP*/;
2343 instruction->info.data_proc.Rn = 13 /*SP*/;
2344 instruction->info.data_proc.shifter_operand.immediate.immediate = imm*4;
2345
2346 return ERROR_OK;
2347 }
2348
2349 static int evaluate_breakpoint_thumb(uint16_t opcode,
2350 uint32_t address, arm_instruction_t *instruction)
2351 {
2352 uint32_t imm = opcode & 0xff;
2353
2354 instruction->type = ARM_BKPT;
2355
2356 snprintf(instruction->text, 128,
2357 "0x%8.8" PRIx32 " 0x%4.4x \tBKPT\t%#2.2" PRIx32 "",
2358 address, opcode, imm);
2359
2360 return ERROR_OK;
2361 }
2362
2363 static int evaluate_load_store_multiple_thumb(uint16_t opcode,
2364 uint32_t address, arm_instruction_t *instruction)
2365 {
2366 uint32_t reg_list = opcode & 0xff;
2367 uint32_t L = opcode & (1 << 11);
2368 uint32_t R = opcode & (1 << 8);
2369 uint8_t Rn = (opcode >> 8) & 7;
2370 uint8_t addr_mode = 0 /* IA */;
2371 char reg_names[40];
2372 char *reg_names_p;
2373 char *mnemonic;
2374 char ptr_name[7] = "";
2375 int i;
2376
2377 /* REVISIT: in ThumbEE mode, there are no LDM or STM instructions.
2378 * The STMIA and LDMIA opcodes are used for other instructions.
2379 */
2380
2381 if ((opcode & 0xf000) == 0xc000)
2382 { /* generic load/store multiple */
2383 char *wback = "!";
2384
2385 if (L)
2386 {
2387 instruction->type = ARM_LDM;
2388 mnemonic = "LDM";
2389 if (opcode & (1 << Rn))
2390 wback = "";
2391 }
2392 else
2393 {
2394 instruction->type = ARM_STM;
2395 mnemonic = "STM";
2396 }
2397 snprintf(ptr_name, sizeof ptr_name, "r%i%s, ", Rn, wback);
2398 }
2399 else
2400 { /* push/pop */
2401 Rn = 13; /* SP */
2402 if (L)
2403 {
2404 instruction->type = ARM_LDM;
2405 mnemonic = "POP";
2406 if (R)
2407 reg_list |= (1 << 15) /*PC*/;
2408 }
2409 else
2410 {
2411 instruction->type = ARM_STM;
2412 mnemonic = "PUSH";
2413 addr_mode = 3; /*DB*/
2414 if (R)
2415 reg_list |= (1 << 14) /*LR*/;
2416 }
2417 }
2418
2419 reg_names_p = reg_names;
2420 for (i = 0; i <= 15; i++)
2421 {
2422 if (reg_list & (1 << i))
2423 reg_names_p += snprintf(reg_names_p, (reg_names + 40 - reg_names_p), "r%i, ", i);
2424 }
2425 if (reg_names_p > reg_names)
2426 reg_names_p[-2] = '\0';
2427 else /* invalid op : no registers */
2428 reg_names[0] = '\0';
2429
2430 snprintf(instruction->text, 128,
2431 "0x%8.8" PRIx32 " 0x%4.4x \t%s\t%s{%s}",
2432 address, opcode, mnemonic, ptr_name, reg_names);
2433
2434 instruction->info.load_store_multiple.register_list = reg_list;
2435 instruction->info.load_store_multiple.Rn = Rn;
2436 instruction->info.load_store_multiple.addressing_mode = addr_mode;
2437
2438 return ERROR_OK;
2439 }
2440
2441 static int evaluate_cond_branch_thumb(uint16_t opcode,
2442 uint32_t address, arm_instruction_t *instruction)
2443 {
2444 uint32_t offset = opcode & 0xff;
2445 uint8_t cond = (opcode >> 8) & 0xf;
2446 uint32_t target_address;
2447
2448 if (cond == 0xf)
2449 {
2450 instruction->type = ARM_SWI;
2451 snprintf(instruction->text, 128,
2452 "0x%8.8" PRIx32 " 0x%4.4x \tSVC\t%#2.2" PRIx32,
2453 address, opcode, offset);
2454 return ERROR_OK;
2455 }
2456 else if (cond == 0xe)
2457 {
2458 instruction->type = ARM_UNDEFINED_INSTRUCTION;
2459 snprintf(instruction->text, 128,
2460 "0x%8.8" PRIx32 " 0x%4.4x \tUNDEFINED INSTRUCTION",
2461 address, opcode);
2462 return ERROR_OK;
2463 }
2464
2465 /* sign extend 8-bit offset */
2466 if (offset & 0x00000080)
2467 offset = 0xffffff00 | offset;
2468
2469 target_address = address + 4 + (offset << 1);
2470
2471 snprintf(instruction->text, 128,
2472 "0x%8.8" PRIx32 " 0x%4.4x \tB%s\t%#8.8" PRIx32,
2473 address, opcode,
2474 arm_condition_strings[cond], target_address);
2475
2476 instruction->type = ARM_B;
2477 instruction->info.b_bl_bx_blx.reg_operand = -1;
2478 instruction->info.b_bl_bx_blx.target_address = target_address;
2479
2480 return ERROR_OK;
2481 }
2482
2483 static int evaluate_cb_thumb(uint16_t opcode, uint32_t address,
2484 arm_instruction_t *instruction)
2485 {
2486 unsigned offset;
2487
2488 /* added in Thumb2 */
2489 offset = (opcode >> 3) & 0x1f;
2490 offset |= (opcode & 0x0200) >> 4;
2491
2492 snprintf(instruction->text, 128,
2493 "0x%8.8" PRIx32 " 0x%4.4x \tCB%sZ\tr%d, %#8.8" PRIx32,
2494 address, opcode,
2495 (opcode & 0x0800) ? "N" : "",
2496 opcode & 0x7, address + 4 + (offset << 1));
2497
2498 return ERROR_OK;
2499 }
2500
2501 static int evaluate_extend_thumb(uint16_t opcode, uint32_t address,
2502 arm_instruction_t *instruction)
2503 {
2504 /* added in ARMv6 */
2505 snprintf(instruction->text, 128,
2506 "0x%8.8" PRIx32 " 0x%4.4x \t%cXT%c\tr%d, r%d",
2507 address, opcode,
2508 (opcode & 0x0080) ? 'U' : 'S',
2509 (opcode & 0x0040) ? 'B' : 'H',
2510 opcode & 0x7, (opcode >> 3) & 0x7);
2511
2512 return ERROR_OK;
2513 }
2514
2515 static int evaluate_cps_thumb(uint16_t opcode, uint32_t address,
2516 arm_instruction_t *instruction)
2517 {
2518 /* added in ARMv6 */
2519 if ((opcode & 0x0ff0) == 0x0650)
2520 snprintf(instruction->text, 128,
2521 "0x%8.8" PRIx32 " 0x%4.4x \tSETEND %s",
2522 address, opcode,
2523 (opcode & 0x80) ? "BE" : "LE");
2524 else /* ASSUME (opcode & 0x0fe0) == 0x0660 */
2525 snprintf(instruction->text, 128,
2526 "0x%8.8" PRIx32 " 0x%4.4x \tCPSI%c\t%s%s%s",
2527 address, opcode,
2528 (opcode & 0x0010) ? 'D' : 'E',
2529 (opcode & 0x0004) ? "A" : "",
2530 (opcode & 0x0002) ? "I" : "",
2531 (opcode & 0x0001) ? "F" : "");
2532
2533 return ERROR_OK;
2534 }
2535
2536 static int evaluate_byterev_thumb(uint16_t opcode, uint32_t address,
2537 arm_instruction_t *instruction)
2538 {
2539 char *suffix;
2540
2541 /* added in ARMv6 */
2542 switch ((opcode >> 6) & 3) {
2543 case 0:
2544 suffix = "";
2545 break;
2546 case 1:
2547 suffix = "16";
2548 break;
2549 default:
2550 suffix = "SH";
2551 break;
2552 }
2553 snprintf(instruction->text, 128,
2554 "0x%8.8" PRIx32 " 0x%4.4x \tREV%s\tr%d, r%d",
2555 address, opcode, suffix,
2556 opcode & 0x7, (opcode >> 3) & 0x7);
2557
2558 return ERROR_OK;
2559 }
2560
2561 static int evaluate_hint_thumb(uint16_t opcode, uint32_t address,
2562 arm_instruction_t *instruction)
2563 {
2564 char *hint;
2565
2566 switch ((opcode >> 4) & 0x0f) {
2567 case 0:
2568 hint = "NOP";
2569 break;
2570 case 1:
2571 hint = "YIELD";
2572 break;
2573 case 2:
2574 hint = "WFE";
2575 break;
2576 case 3:
2577 hint = "WFI";
2578 break;
2579 case 4:
2580 hint = "SEV";
2581 break;
2582 default:
2583 hint = "HINT (UNRECOGNIZED)";
2584 break;
2585 }
2586
2587 snprintf(instruction->text, 128,
2588 "0x%8.8" PRIx32 " 0x%4.4x \t%s",
2589 address, opcode, hint);
2590
2591 return ERROR_OK;
2592 }
2593
2594 static int evaluate_ifthen_thumb(uint16_t opcode, uint32_t address,
2595 arm_instruction_t *instruction)
2596 {
2597 unsigned cond = (opcode >> 4) & 0x0f;
2598 char *x = "", *y = "", *z = "";
2599
2600 if (opcode & 0x01)
2601 z = (opcode & 0x02) ? "T" : "E";
2602 if (opcode & 0x03)
2603 y = (opcode & 0x04) ? "T" : "E";
2604 if (opcode & 0x07)
2605 x = (opcode & 0x08) ? "T" : "E";
2606
2607 snprintf(instruction->text, 128,
2608 "0x%8.8" PRIx32 " 0x%4.4x \tIT%s%s%s\t%s",
2609 address, opcode,
2610 x, y, z, arm_condition_strings[cond]);
2611
2612 /* NOTE: strictly speaking, the next 1-4 instructions should
2613 * now be displayed with the relevant conditional suffix...
2614 */
2615
2616 return ERROR_OK;
2617 }
2618
2619 int thumb_evaluate_opcode(uint16_t opcode, uint32_t address, arm_instruction_t *instruction)
2620 {
2621 /* clear fields, to avoid confusion */
2622 memset(instruction, 0, sizeof(arm_instruction_t));
2623 instruction->opcode = opcode;
2624 instruction->instruction_size = 2;
2625
2626 if ((opcode & 0xe000) == 0x0000)
2627 {
2628 /* add/substract register or immediate */
2629 if ((opcode & 0x1800) == 0x1800)
2630 return evaluate_add_sub_thumb(opcode, address, instruction);
2631 /* shift by immediate */
2632 else
2633 return evaluate_shift_imm_thumb(opcode, address, instruction);
2634 }
2635
2636 /* Add/substract/compare/move immediate */
2637 if ((opcode & 0xe000) == 0x2000)
2638 {
2639 return evaluate_data_proc_imm_thumb(opcode, address, instruction);
2640 }
2641
2642 /* Data processing instructions */
2643 if ((opcode & 0xf800) == 0x4000)
2644 {
2645 return evaluate_data_proc_thumb(opcode, address, instruction);
2646 }
2647
2648 /* Load from literal pool */
2649 if ((opcode & 0xf800) == 0x4800)
2650 {
2651 return evaluate_load_literal_thumb(opcode, address, instruction);
2652 }
2653
2654 /* Load/Store register offset */
2655 if ((opcode & 0xf000) == 0x5000)
2656 {
2657 return evaluate_load_store_reg_thumb(opcode, address, instruction);
2658 }
2659
2660 /* Load/Store immediate offset */
2661 if (((opcode & 0xe000) == 0x6000)
2662 ||((opcode & 0xf000) == 0x8000))
2663 {
2664 return evaluate_load_store_imm_thumb(opcode, address, instruction);
2665 }
2666
2667 /* Load/Store from/to stack */
2668 if ((opcode & 0xf000) == 0x9000)
2669 {
2670 return evaluate_load_store_stack_thumb(opcode, address, instruction);
2671 }
2672
2673 /* Add to SP/PC */
2674 if ((opcode & 0xf000) == 0xa000)
2675 {
2676 return evaluate_add_sp_pc_thumb(opcode, address, instruction);
2677 }
2678
2679 /* Misc */
2680 if ((opcode & 0xf000) == 0xb000)
2681 {
2682 switch ((opcode >> 8) & 0x0f) {
2683 case 0x0:
2684 return evaluate_adjust_stack_thumb(opcode, address, instruction);
2685 case 0x1:
2686 case 0x3:
2687 case 0x9:
2688 case 0xb:
2689 return evaluate_cb_thumb(opcode, address, instruction);
2690 case 0x2:
2691 return evaluate_extend_thumb(opcode, address, instruction);
2692 case 0x4:
2693 case 0x5:
2694 case 0xc:
2695 case 0xd:
2696 return evaluate_load_store_multiple_thumb(opcode, address,
2697 instruction);
2698 case 0x6:
2699 return evaluate_cps_thumb(opcode, address, instruction);
2700 case 0xa:
2701 if ((opcode & 0x00c0) == 0x0080)
2702 break;
2703 return evaluate_byterev_thumb(opcode, address, instruction);
2704 case 0xe:
2705 return evaluate_breakpoint_thumb(opcode, address, instruction);
2706 case 0xf:
2707 if (opcode & 0x000f)
2708 return evaluate_ifthen_thumb(opcode, address,
2709 instruction);
2710 else
2711 return evaluate_hint_thumb(opcode, address,
2712 instruction);
2713 }
2714
2715 instruction->type = ARM_UNDEFINED_INSTRUCTION;
2716 snprintf(instruction->text, 128,
2717 "0x%8.8" PRIx32 " 0x%4.4x \tUNDEFINED INSTRUCTION",
2718 address, opcode);
2719 return ERROR_OK;
2720 }
2721
2722 /* Load/Store multiple */
2723 if ((opcode & 0xf000) == 0xc000)
2724 {
2725 return evaluate_load_store_multiple_thumb(opcode, address, instruction);
2726 }
2727
2728 /* Conditional branch + SWI */
2729 if ((opcode & 0xf000) == 0xd000)
2730 {
2731 return evaluate_cond_branch_thumb(opcode, address, instruction);
2732 }
2733
2734 if ((opcode & 0xe000) == 0xe000)
2735 {
2736 /* Undefined instructions */
2737 if ((opcode & 0xf801) == 0xe801)
2738 {
2739 instruction->type = ARM_UNDEFINED_INSTRUCTION;
2740 snprintf(instruction->text, 128,
2741 "0x%8.8" PRIx32 " 0x%8.8x\t"
2742 "UNDEFINED INSTRUCTION",
2743 address, opcode);
2744 return ERROR_OK;
2745 }
2746 else
2747 { /* Branch to offset */
2748 return evaluate_b_bl_blx_thumb(opcode, address, instruction);
2749 }
2750 }
2751
2752 LOG_ERROR("should never reach this point (opcode=%04x)",opcode);
2753 return -1;
2754 }
2755
2756 static int t2ev_b_bl(uint32_t opcode, uint32_t address,
2757 arm_instruction_t *instruction, char *cp)
2758 {
2759 unsigned offset;
2760 unsigned b21 = 1 << 21;
2761 unsigned b22 = 1 << 22;
2762
2763 /* instead of combining two smaller 16-bit branch instructions,
2764 * Thumb2 uses only one larger 32-bit instruction.
2765 */
2766 offset = opcode & 0x7ff;
2767 offset |= (opcode & 0x03ff0000) >> 5;
2768 if (opcode & (1 << 26)) {
2769 offset |= 0xff << 23;
2770 if ((opcode & (1 << 11)) == 0)
2771 b21 = 0;
2772 if ((opcode & (1 << 13)) == 0)
2773 b22 = 0;
2774 } else {
2775 if (opcode & (1 << 11))
2776 b21 = 0;
2777 if (opcode & (1 << 13))
2778 b22 = 0;
2779 }
2780 offset |= b21;
2781 offset |= b22;
2782
2783
2784 address += 4;
2785 address += offset << 1;
2786
2787 instruction->type = (opcode & (1 << 14)) ? ARM_BL : ARM_B;
2788 instruction->info.b_bl_bx_blx.reg_operand = -1;
2789 instruction->info.b_bl_bx_blx.target_address = address;
2790 sprintf(cp, "%s\t%#8.8" PRIx32,
2791 (opcode & (1 << 14)) ? "BL" : "B.W",
2792 address);
2793
2794 return ERROR_OK;
2795 }
2796
2797 static int t2ev_cond_b(uint32_t opcode, uint32_t address,
2798 arm_instruction_t *instruction, char *cp)
2799 {
2800 unsigned offset;
2801 unsigned b17 = 1 << 17;
2802 unsigned b18 = 1 << 18;
2803 unsigned cond = (opcode >> 22) & 0x0f;
2804
2805 offset = opcode & 0x7ff;
2806 offset |= (opcode & 0x003f0000) >> 5;
2807 if (opcode & (1 << 26)) {
2808 offset |= 0xffff << 19;
2809 if ((opcode & (1 << 11)) == 0)
2810 b17 = 0;
2811 if ((opcode & (1 << 13)) == 0)
2812 b18 = 0;
2813 } else {
2814 if (opcode & (1 << 11))
2815 b17 = 0;
2816 if (opcode & (1 << 13))
2817 b18 = 0;
2818 }
2819 offset |= b17;
2820 offset |= b18;
2821
2822 address += 4;
2823 address += offset << 1;
2824
2825 instruction->type = ARM_B;
2826 instruction->info.b_bl_bx_blx.reg_operand = -1;
2827 instruction->info.b_bl_bx_blx.target_address = address;
2828 sprintf(cp, "B%s.W\t%#8.8" PRIx32,
2829 arm_condition_strings[cond],
2830 address);
2831
2832 return ERROR_OK;
2833 }
2834
2835 static const char *special_name(int number)
2836 {
2837 char *special = "(RESERVED)";
2838
2839 switch (number) {
2840 case 0:
2841 special = "apsr";
2842 break;
2843 case 1:
2844 special = "iapsr";
2845 break;
2846 case 2:
2847 special = "eapsr";
2848 break;
2849 case 3:
2850 special = "xpsr";
2851 break;
2852 case 5:
2853 special = "ipsr";
2854 break;
2855 case 6:
2856 special = "epsr";
2857 break;
2858 case 7:
2859 special = "iepsr";
2860 break;
2861 case 8:
2862 special = "msp";
2863 break;
2864 case 9:
2865 special = "psp";
2866 break;
2867 case 16:
2868 special = "primask";
2869 break;
2870 case 17:
2871 special = "basepri";
2872 break;
2873 case 18:
2874 special = "basepri_max";
2875 break;
2876 case 19:
2877 special = "faultmask";
2878 break;
2879 case 20:
2880 special = "control";
2881 break;
2882 }
2883 return special;
2884 }
2885
2886 static int t2ev_hint(uint32_t opcode, uint32_t address,
2887 arm_instruction_t *instruction, char *cp)
2888 {
2889 const char *mnemonic;
2890
2891 if (opcode & 0x0700) {
2892 instruction->type = ARM_UNDEFINED_INSTRUCTION;
2893 strcpy(cp, "UNDEFINED");
2894 return ERROR_OK;
2895 }
2896
2897 if (opcode & 0x00f0) {
2898 sprintf(cp, "DBG\t#%d", (int) opcode & 0xf);
2899 return ERROR_OK;
2900 }
2901
2902 switch (opcode & 0x0f) {
2903 case 0:
2904 mnemonic = "NOP.W";
2905 break;
2906 case 1:
2907 mnemonic = "YIELD.W";
2908 break;
2909 case 2:
2910 mnemonic = "WFE.W";
2911 break;
2912 case 3:
2913 mnemonic = "WFI.W";
2914 break;
2915 case 4:
2916 mnemonic = "SEV.W";
2917 break;
2918 default:
2919 mnemonic = "HINT.W (UNRECOGNIZED)";
2920 break;
2921 }
2922 strcpy(cp, mnemonic);
2923 return ERROR_OK;
2924 }
2925
2926 static int t2ev_misc(uint32_t opcode, uint32_t address,
2927 arm_instruction_t *instruction, char *cp)
2928 {
2929 const char *mnemonic;
2930
2931 switch ((opcode >> 4) & 0x0f) {
2932 case 0:
2933 mnemonic = "LEAVEX";
2934 break;
2935 case 1:
2936 mnemonic = "ENTERX";
2937 break;
2938 case 2:
2939 mnemonic = "CLREX";
2940 break;
2941 case 4:
2942 mnemonic = "DSB";
2943 break;
2944 case 5:
2945 mnemonic = "DMB";
2946 break;
2947 case 6:
2948 mnemonic = "ISB";
2949 break;
2950 default:
2951 return ERROR_INVALID_ARGUMENTS;
2952 }
2953 strcpy(cp, mnemonic);
2954 return ERROR_OK;
2955 }
2956
2957 static int t2ev_b_misc(uint32_t opcode, uint32_t address,
2958 arm_instruction_t *instruction, char *cp)
2959 {
2960 /* permanently undefined */
2961 if ((opcode & 0x07f07000) == 0x07f02000) {
2962 instruction->type = ARM_UNDEFINED_INSTRUCTION;
2963 strcpy(cp, "UNDEFINED");
2964 return ERROR_OK;
2965 }
2966
2967 switch ((opcode >> 12) & 0x5) {
2968 case 0x1:
2969 case 0x5:
2970 return t2ev_b_bl(opcode, address, instruction, cp);
2971 case 0x4:
2972 goto undef;
2973 case 0:
2974 if (((opcode >> 23) & 0x07) != 0x07)
2975 return t2ev_cond_b(opcode, address, instruction, cp);
2976 if (opcode & (1 << 26))
2977 goto undef;
2978 break;
2979 }
2980
2981 switch ((opcode >> 20) & 0x7f) {
2982 case 0x38:
2983 case 0x39:
2984 sprintf(cp, "MSR\t%s, r%d", special_name(opcode & 0xff),
2985 (int) (opcode >> 16) & 0x0f);
2986 return ERROR_OK;
2987 case 0x3a:
2988 return t2ev_hint(opcode, address, instruction, cp);
2989 case 0x3b:
2990 return t2ev_misc(opcode, address, instruction, cp);
2991 case 0x3c:
2992 sprintf(cp, "BXJ\tr%d", (int) (opcode >> 16) & 0x0f);
2993 return ERROR_OK;
2994 case 0x3e:
2995 case 0x3f:
2996 sprintf(cp, "MRS\tr%d, %s", (int) (opcode >> 8) & 0x0f,
2997 special_name(opcode & 0xff));
2998 return ERROR_OK;
2999 }
3000
3001 undef:
3002 return ERROR_INVALID_ARGUMENTS;
3003 }
3004
3005 static int t2ev_data_mod_immed(uint32_t opcode, uint32_t address,
3006 arm_instruction_t *instruction, char *cp)
3007 {
3008 char *mnemonic = NULL;
3009 int rn = (opcode >> 16) & 0xf;
3010 int rd = (opcode >> 8) & 0xf;
3011 unsigned immed = opcode & 0xff;
3012 unsigned func;
3013 bool one = false;
3014 char *suffix = "";
3015 char *suffix2 = "";
3016
3017 /* ARMv7-M: A5.3.2 Modified immediate constants */
3018 func = (opcode >> 11) & 0x0e;
3019 if (immed & 0x80)
3020 func |= 1;
3021 if (opcode & (1 << 26))
3022 func |= 0x10;
3023
3024 /* "Modified" immediates */
3025 switch (func >> 1) {
3026 case 0:
3027 break;
3028 case 2:
3029 immed <<= 8;
3030 /* FALLTHROUGH */
3031 case 1:
3032 immed += immed << 16;
3033 break;
3034 case 3:
3035 immed += immed << 8;
3036 immed += immed << 16;
3037 break;
3038 default:
3039 immed |= 0x80;
3040 immed = ror(immed, func);
3041 }
3042
3043 if (opcode & (1 << 20))
3044 suffix = "S";
3045
3046 switch ((opcode >> 21) & 0xf) {
3047 case 0:
3048 if (rd == 0xf) {
3049 instruction->type = ARM_TST;
3050 mnemonic = "TST";
3051 one = true;
3052 suffix = "";
3053 rd = rn;
3054 } else {
3055 instruction->type = ARM_AND;
3056 mnemonic = "AND";
3057 }
3058 break;
3059 case 1:
3060 instruction->type = ARM_BIC;
3061 mnemonic = "BIC";
3062 break;
3063 case 2:
3064 if (rn == 0xf) {
3065 instruction->type = ARM_MOV;
3066 mnemonic = "MOV";
3067 one = true;
3068 suffix2 = ".W";
3069 } else {
3070 instruction->type = ARM_ORR;
3071 mnemonic = "ORR";
3072 }
3073 break;
3074 case 3:
3075 if (rn == 0xf) {
3076 instruction->type = ARM_MVN;
3077 mnemonic = "MVN";
3078 one = true;
3079 } else {
3080 // instruction->type = ARM_ORN;
3081 mnemonic = "ORN";
3082 }
3083 break;
3084 case 4:
3085 if (rd == 0xf) {
3086 instruction->type = ARM_TEQ;
3087 mnemonic = "TEQ";
3088 one = true;
3089 suffix = "";
3090 rd = rn;
3091 } else {
3092 instruction->type = ARM_EOR;
3093 mnemonic = "EOR";
3094 }
3095 break;
3096 case 8:
3097 if (rd == 0xf) {
3098 instruction->type = ARM_CMN;
3099 mnemonic = "CMN";
3100 one = true;
3101 suffix = "";
3102 rd = rn;
3103 } else {
3104 instruction->type = ARM_ADD;
3105 mnemonic = "ADD";
3106 suffix2 = ".W";
3107 }
3108 break;
3109 case 10:
3110 instruction->type = ARM_ADC;
3111 mnemonic = "ADC";
3112 suffix2 = ".W";
3113 break;
3114 case 11:
3115 instruction->type = ARM_SBC;
3116 mnemonic = "SBC";
3117 break;
3118 case 13:
3119 if (rd == 0xf) {
3120 instruction->type = ARM_CMP;
3121 mnemonic = "CMP";
3122 one = true;
3123 suffix = "";
3124 rd = rn;
3125 } else {
3126 instruction->type = ARM_SUB;
3127 mnemonic = "SUB";
3128 }
3129 suffix2 = ".W";
3130 break;
3131 case 14:
3132 instruction->type = ARM_RSB;
3133 mnemonic = "RSB";
3134 suffix2 = ".W";
3135 break;
3136 default:
3137 return ERROR_INVALID_ARGUMENTS;
3138 }
3139
3140 if (one)
3141 sprintf(cp, "%s%s\tr%d, #%d\t; %#8.8x",
3142 mnemonic, suffix2 ,rd, immed, immed);
3143 else
3144 sprintf(cp, "%s%s%s\tr%d, r%d, #%d\t; %#8.8x",
3145 mnemonic, suffix, suffix2,
3146 rd, rn, immed, immed);
3147
3148 return ERROR_OK;
3149 }
3150
3151 static int t2ev_data_immed(uint32_t opcode, uint32_t address,
3152 arm_instruction_t *instruction, char *cp)
3153 {
3154 char *mnemonic = NULL;
3155 int rn = (opcode >> 16) & 0xf;
3156 int rd = (opcode >> 8) & 0xf;
3157 unsigned immed;
3158 bool add = false;
3159 bool is_signed = false;
3160
3161 immed = (opcode & 0x0ff) | ((opcode & 0x7000) >> 4);
3162 if (opcode & (1 << 26))
3163 immed |= (1 << 11);
3164
3165 switch ((opcode >> 20) & 0x1f) {
3166 case 0:
3167 if (rn == 0xf) {
3168 add = true;
3169 goto do_adr;
3170 }
3171 mnemonic = "ADDW";
3172 break;
3173 case 4:
3174 immed |= (opcode >> 4) & 0xf000;
3175 sprintf(cp, "MOVW\tr%d, #%d\t; %#3.3x", rd, immed, immed);
3176 return ERROR_OK;
3177 case 0x0a:
3178 if (rn == 0xf)
3179 goto do_adr;
3180 mnemonic = "SUBW";
3181 break;
3182 case 0x0c:
3183 /* move constant to top 16 bits of register */
3184 immed |= (opcode >> 4) & 0xf000;
3185 sprintf(cp, "MOVT\tr%d, #%d\t; %#4.4x", rn, immed, immed);
3186 return ERROR_OK;
3187 case 0x10:
3188 case 0x12:
3189 is_signed = true;
3190 case 0x18:
3191 case 0x1a:
3192 /* signed/unsigned saturated add */
3193 immed = (opcode >> 6) & 0x03;
3194 immed |= (opcode >> 10) & 0x1c;
3195 sprintf(cp, "%sSAT\tr%d, #%d, r%d, %s #%d\t",
3196 is_signed ? "S" : "U",
3197 rd, (int) (opcode & 0x1f) + is_signed, rn,
3198 (opcode & (1 << 21)) ? "ASR" : "LSL",
3199 immed ? immed : 32);
3200 return ERROR_OK;
3201 case 0x14:
3202 is_signed = true;
3203 /* FALLTHROUGH */
3204 case 0x1c:
3205 /* signed/unsigned bitfield extract */
3206 immed = (opcode >> 6) & 0x03;
3207 immed |= (opcode >> 10) & 0x1c;
3208 sprintf(cp, "%sBFX\tr%d, r%d, #%d, #%d\t",
3209 is_signed ? "S" : "U",
3210 rd, rn, immed,
3211 (int) (opcode & 0x1f) + 1);
3212 return ERROR_OK;
3213 case 0x16:
3214 immed = (opcode >> 6) & 0x03;
3215 immed |= (opcode >> 10) & 0x1c;
3216 if (rn == 0xf) /* bitfield clear */
3217 sprintf(cp, "BFC\tr%d, #%d, #%d\t",
3218 rd, immed,
3219 (int) (opcode & 0x1f) + 1 - immed);
3220 else /* bitfield insert */
3221 sprintf(cp, "BFI\tr%d, r%d, #%d, #%d\t",
3222 rd, rn, immed,
3223 (int) (opcode & 0x1f) + 1 - immed);
3224 return ERROR_OK;
3225 default:
3226 return ERROR_INVALID_ARGUMENTS;
3227 }
3228
3229 sprintf(cp, "%s\tr%d, r%d, #%d\t; %#3.3x", mnemonic,
3230 rd, rn, immed, immed);
3231 return ERROR_OK;
3232
3233 do_adr:
3234 address = thumb_alignpc4(address);
3235 if (add)
3236 address += immed;
3237 else
3238 address -= immed;
3239 /* REVISIT "ADD/SUB Rd, PC, #const ; 0x..." might be better;
3240 * not hiding the pc-relative stuff will sometimes be useful.
3241 */
3242 sprintf(cp, "ADR.W\tr%d, %#8.8" PRIx32, rd, address);
3243 return ERROR_OK;
3244 }
3245
3246 static int t2ev_store_single(uint32_t opcode, uint32_t address,
3247 arm_instruction_t *instruction, char *cp)
3248 {
3249 unsigned op = (opcode >> 20) & 0xf;
3250 char *size = "";
3251 char *suffix = "";
3252 char *p1 = "";
3253 char *p2 = "]";
3254 unsigned immed;
3255 unsigned rn = (opcode >> 16) & 0x0f;
3256 unsigned rt = (opcode >> 12) & 0x0f;
3257
3258 if (rn == 0xf)
3259 return ERROR_INVALID_ARGUMENTS;
3260
3261 if (opcode & 0x0800)
3262 op |= 1;
3263 switch (op) {
3264 /* byte */
3265 case 0x8:
3266 case 0x9:
3267 size = "B";
3268 goto imm12;
3269 case 0x1:
3270 size = "B";
3271 goto imm8;
3272 case 0x0:
3273 size = "B";
3274 break;
3275 /* halfword */
3276 case 0xa:
3277 case 0xb:
3278 size = "H";
3279 goto imm12;
3280 case 0x3:
3281 size = "H";
3282 goto imm8;
3283 case 0x2:
3284 size = "H";
3285 break;
3286 /* word */
3287 case 0xc:
3288 case 0xd:
3289 goto imm12;
3290 case 0x5:
3291 goto imm8;
3292 case 0x4:
3293 break;
3294 /* error */
3295 default:
3296 return ERROR_INVALID_ARGUMENTS;
3297 }
3298
3299 sprintf(cp, "STR%s.W\tr%d, [r%d, r%d, LSL #%d]",
3300 size, rt, rn, (int) opcode & 0x0f,
3301 (int) (opcode >> 4) & 0x03);
3302 return ERROR_OK;
3303
3304 imm12:
3305 immed = opcode & 0x0fff;
3306 sprintf(cp, "STR%s.W\tr%d, [r%d, #%u]\t; %#3.3x",
3307 size, rt, rn, immed, immed);
3308 return ERROR_OK;
3309
3310 imm8:
3311 immed = opcode & 0x00ff;
3312
3313 switch (opcode & 0x700) {
3314 case 0x600:
3315 suffix = "T";
3316 break;
3317 case 0x000:
3318 case 0x200:
3319 return ERROR_INVALID_ARGUMENTS;
3320 }
3321
3322 /* two indexed modes will write back rn */
3323 if (opcode & 0x100) {
3324 if (opcode & 0x400) /* pre-indexed */
3325 p2 = "]!";
3326 else { /* post-indexed */
3327 p1 = "]";
3328 p2 = "";
3329 }
3330 }
3331
3332 sprintf(cp, "STR%s%s\tr%d, [r%d%s, #%s%u%s\t; %#2.2x",
3333 size, suffix, rt, rn, p1,
3334 (opcode & 0x200) ? "" : "-",
3335 immed, p2, immed);
3336 return ERROR_OK;
3337 }
3338
3339 static int t2ev_mul32(uint32_t opcode, uint32_t address,
3340 arm_instruction_t *instruction, char *cp)
3341 {
3342 int ra = (opcode >> 12) & 0xf;
3343
3344 switch (opcode & 0x007000f0) {
3345 case 0:
3346 if (ra == 0xf)
3347 sprintf(cp, "MUL\tr%d, r%d, r%d",
3348 (int) (opcode >> 8) & 0xf,
3349 (int) (opcode >> 16) & 0xf,
3350 (int) (opcode >> 0) & 0xf);
3351 else
3352 sprintf(cp, "MLA\tr%d, r%d, r%d, r%d",
3353 (int) (opcode >> 8) & 0xf,
3354 (int) (opcode >> 16) & 0xf,
3355 (int) (opcode >> 0) & 0xf, ra);
3356 break;
3357 case 0x10:
3358 sprintf(cp, "MLS\tr%d, r%d, r%d, r%d",
3359 (int) (opcode >> 8) & 0xf,
3360 (int) (opcode >> 16) & 0xf,
3361 (int) (opcode >> 0) & 0xf, ra);
3362 break;
3363 default:
3364 return ERROR_INVALID_ARGUMENTS;
3365 }
3366 return ERROR_OK;
3367 }
3368
3369 static int t2ev_mul64_div(uint32_t opcode, uint32_t address,
3370 arm_instruction_t *instruction, char *cp)
3371 {
3372 int op = (opcode >> 4) & 0xf;
3373 char *infix = "MUL";
3374
3375 op += (opcode >> 16) & 0x70;
3376 switch (op) {
3377 case 0x40:
3378 case 0x60:
3379 infix = "MLA";
3380 /* FALLTHROUGH */
3381 case 0:
3382 case 0x20:
3383 sprintf(cp, "%c%sL\tr%d, r%d, r%d, r%d",
3384 (op & 0x20) ? 'U' : 'S',
3385 infix,
3386 (int) (opcode >> 12) & 0xf,
3387 (int) (opcode >> 8) & 0xf,
3388 (int) (opcode >> 16) & 0xf,
3389 (int) (opcode >> 0) & 0xf);
3390 break;
3391 case 0x1f:
3392 case 0x3f:
3393 sprintf(cp, "%cDIV\tr%d, r%d, r%d",
3394 (op & 0x20) ? 'U' : 'S',
3395 (int) (opcode >> 8) & 0xf,
3396 (int) (opcode >> 16) & 0xf,
3397 (int) (opcode >> 0) & 0xf);
3398 break;
3399 default:
3400 return ERROR_INVALID_ARGUMENTS;
3401 }
3402
3403 return ERROR_OK;
3404 }
3405
3406 static int t2ev_ldm_stm(uint32_t opcode, uint32_t address,
3407 arm_instruction_t *instruction, char *cp)
3408 {
3409 int rn = (opcode >> 16) & 0xf;
3410 int op = (opcode >> 22) & 0x6;
3411 int t = (opcode >> 21) & 1;
3412 unsigned registers = opcode & 0xffff;
3413
3414 if (opcode & (1 << 20))
3415 op |= 1;
3416
3417 switch (op) {
3418 case 2:
3419 sprintf(cp, "STM.W\tr%d%s, ", rn, t ? "!" : "");
3420 break;
3421 case 3:
3422 if (rn == 13 && t)
3423 sprintf(cp, "POP.W\t");
3424 else
3425 sprintf(cp, "LDM.W\tr%d%s, ", rn, t ? "!" : "");
3426 break;
3427 case 4:
3428 if (rn == 13 && t)
3429 sprintf(cp, "PUSH.W\t");
3430 else
3431 sprintf(cp, "STMDB\tr%d%s, ", rn, t ? "!" : "");
3432 break;
3433 case 5:
3434 sprintf(cp, "LDMDB.W\tr%d%s, ", rn, t ? "!" : "");
3435 break;
3436 default:
3437 return ERROR_INVALID_ARGUMENTS;
3438 }
3439
3440 cp = strchr(cp, 0);
3441 *cp++ = '{';
3442 for (t = 0; registers; t++, registers >>= 1) {
3443 if ((registers & 1) == 0)
3444 continue;
3445 registers &= ~1;
3446 sprintf(cp, "r%d%s", t, registers ? ", " : "");
3447 cp = strchr(cp, 0);
3448 }
3449 *cp++ = '}';
3450 *cp++ = 0;
3451
3452 return ERROR_OK;
3453 }
3454
3455 /* load/store dual or exclusive, table branch */
3456 static int t2ev_ldrex_strex(uint32_t opcode, uint32_t address,
3457 arm_instruction_t *instruction, char *cp)
3458 {
3459 unsigned op1op2 = (opcode >> 20) & 0x3;
3460 unsigned op3 = (opcode >> 4) & 0xf;
3461 char *mnemonic;
3462 unsigned rn = (opcode >> 16) & 0xf;
3463 unsigned rt = (opcode >> 12) & 0xf;
3464 unsigned rd = (opcode >> 8) & 0xf;
3465 unsigned imm = opcode & 0xff;
3466 char *p1 = "";
3467 char *p2 = "]";
3468
3469 op1op2 |= (opcode >> 21) & 0xc;
3470 switch (op1op2) {
3471 case 0:
3472 mnemonic = "STREX";
3473 goto strex;
3474 case 1:
3475 mnemonic = "LDREX";
3476 goto ldrex;
3477 case 2:
3478 case 6:
3479 case 8:
3480 case 10:
3481 case 12:
3482 case 14:
3483 mnemonic = "STRD";
3484 goto immediate;
3485 case 3:
3486 case 7:
3487 case 9:
3488 case 11:
3489 case 13:
3490 case 15:
3491 mnemonic = "LDRD";
3492 if (rn == 15)
3493 goto literal;
3494 else
3495 goto immediate;
3496 case 4:
3497 switch (op3) {
3498 case 4:
3499 mnemonic = "STREXB";
3500 break;
3501 case 5:
3502 mnemonic = "STREXH";
3503 break;
3504 default:
3505 return ERROR_INVALID_ARGUMENTS;
3506 }
3507 rd = opcode & 0xf;
3508 imm = 0;
3509 goto strex;
3510 case 5:
3511 switch (op3) {
3512 case 0:
3513 sprintf(cp, "TBB\t[r%u, r%u]", rn, imm & 0xf);
3514 return ERROR_OK;
3515 case 1:
3516 sprintf(cp, "TBH\t[r%u, r%u, LSL #1]", rn, imm & 0xf);
3517 return ERROR_OK;
3518 case 4:
3519 mnemonic = "LDREXB";
3520 break;
3521 case 5:
3522 mnemonic = "LDREXH";
3523 break;
3524 default:
3525 return ERROR_INVALID_ARGUMENTS;
3526 }
3527 imm = 0;
3528 goto ldrex;
3529 }
3530 return ERROR_INVALID_ARGUMENTS;
3531
3532 strex:
3533 imm <<= 2;
3534 if (imm)
3535 sprintf(cp, "%s\tr%u, r%u, [r%u, #%u]\t; %#2.2x",
3536 mnemonic, rd, rt, rn, imm, imm);
3537 else
3538 sprintf(cp, "%s\tr%u, r%u, [r%u]",
3539 mnemonic, rd, rt, rn);
3540 return ERROR_OK;
3541
3542 ldrex:
3543 imm <<= 2;
3544 if (imm)
3545 sprintf(cp, "%s\tr%u, [r%u, #%u]\t; %#2.2x",
3546 mnemonic, rt, rn, imm, imm);
3547 else
3548 sprintf(cp, "%s\tr%u, [r%u]",
3549 mnemonic, rt, rn);
3550 return ERROR_OK;
3551
3552 immediate:
3553 /* two indexed modes will write back rn */
3554 if (opcode & (1 << 21)) {
3555 if (opcode & (1 << 24)) /* pre-indexed */
3556 p2 = "]!";
3557 else { /* post-indexed */
3558 p1 = "]";
3559 p2 = "";
3560 }
3561 }
3562
3563 imm <<= 2;
3564 sprintf(cp, "%s\tr%u, r%u, [r%u%s, #%s%u%s\t; %#2.2x",
3565 mnemonic, rt, rd, rn, p1,
3566 (opcode & (1 << 23)) ? "" : "-",
3567 imm, p2, imm);
3568 return ERROR_OK;
3569
3570 literal:
3571 address = thumb_alignpc4(address);
3572 imm <<= 2;
3573 if (opcode & (1 << 23))
3574 address += imm;
3575 else
3576 address -= imm;
3577 sprintf(cp, "%s\tr%u, r%u, %#8.8" PRIx32,
3578 mnemonic, rt, rd, address);
3579 return ERROR_OK;
3580 }
3581
3582 static int t2ev_data_shift(uint32_t opcode, uint32_t address,
3583 arm_instruction_t *instruction, char *cp)
3584 {
3585 int op = (opcode >> 21) & 0xf;
3586 int rd = (opcode >> 8) & 0xf;
3587 int rn = (opcode >> 16) & 0xf;
3588 int type = (opcode >> 4) & 0x3;
3589 int immed = (opcode >> 6) & 0x3;
3590 char *mnemonic;
3591 char *suffix = "";
3592
3593 immed |= (opcode >> 10) & 0x1c;
3594 if (opcode & (1 << 20))
3595 suffix = "S";
3596
3597 switch (op) {
3598 case 0:
3599 if (rd == 0xf) {
3600 if (!(opcode & (1 << 20)))
3601 return ERROR_INVALID_ARGUMENTS;
3602 instruction->type = ARM_TST;
3603 mnemonic = "TST";
3604 suffix = "";
3605 goto two;
3606 }
3607 instruction->type = ARM_AND;
3608 mnemonic = "AND";
3609 break;
3610 case 1:
3611 instruction->type = ARM_BIC;
3612 mnemonic = "BIC";
3613 break;
3614 case 2:
3615 if (rn == 0xf) {
3616 instruction->type = ARM_MOV;
3617 switch (type) {
3618 case 0:
3619 if (immed == 0) {
3620 sprintf(cp, "MOV%s.W\tr%d, r%d",
3621 suffix, rd,
3622 (int) (opcode & 0xf));
3623 return ERROR_OK;
3624 }
3625 mnemonic = "LSL";
3626 break;
3627 case 1:
3628 mnemonic = "LSR";
3629 break;
3630 case 2:
3631 mnemonic = "ASR";
3632 break;
3633 default:
3634 if (immed == 0) {
3635 sprintf(cp, "RRX%s\tr%d, r%d",
3636 suffix, rd,
3637 (int) (opcode & 0xf));
3638 return ERROR_OK;
3639 }
3640 mnemonic = "ROR";
3641 break;
3642 }
3643 goto immediate;
3644 } else {
3645 instruction->type = ARM_ORR;
3646 mnemonic = "ORR";
3647 }
3648 break;
3649 case 3:
3650 if (rn == 0xf) {
3651 instruction->type = ARM_MVN;
3652 mnemonic = "MVN";
3653 rn = rd;
3654 goto two;
3655 } else {
3656 // instruction->type = ARM_ORN;
3657 mnemonic = "ORN";
3658 }
3659 break;
3660 case 4:
3661 if (rd == 0xf) {
3662 if (!(opcode & (1 << 20)))
3663 return ERROR_INVALID_ARGUMENTS;
3664 instruction->type = ARM_TEQ;
3665 mnemonic = "TEQ";
3666 suffix = "";
3667 goto two;
3668 }
3669 instruction->type = ARM_EOR;
3670 mnemonic = "EOR";
3671 break;
3672 case 8:
3673 if (rd == 0xf) {
3674 if (!(opcode & (1 << 20)))
3675 return ERROR_INVALID_ARGUMENTS;
3676 instruction->type = ARM_CMN;
3677 mnemonic = "CMN";
3678 suffix = "";
3679 goto two;
3680 }
3681 instruction->type = ARM_ADD;
3682 mnemonic = "ADD";
3683 break;
3684 case 0xa:
3685 instruction->type = ARM_ADC;
3686 mnemonic = "ADC";
3687 break;
3688 case 0xb:
3689 instruction->type = ARM_SBC;
3690 mnemonic = "SBC";
3691 break;
3692 case 0xd:
3693 if (rd == 0xf) {
3694 if (!(opcode & (1 << 21)))
3695 return ERROR_INVALID_ARGUMENTS;
3696 instruction->type = ARM_CMP;
3697 mnemonic = "CMP";
3698 suffix = "";
3699 goto two;
3700 }
3701 instruction->type = ARM_SUB;
3702 mnemonic = "SUB";
3703 break;
3704 case 0xe:
3705 instruction->type = ARM_RSB;
3706 mnemonic = "RSB";
3707 break;
3708 default:
3709 return ERROR_INVALID_ARGUMENTS;
3710 }
3711
3712 sprintf(cp, "%s%s.W\tr%d, r%d, r%d",
3713 mnemonic, suffix, rd, rn, (int) (opcode & 0xf));
3714
3715 shift:
3716 cp = strchr(cp, 0);
3717
3718 switch (type) {
3719 case 0:
3720 if (immed == 0)
3721 return ERROR_OK;
3722 suffix = "LSL";
3723 break;
3724 case 1:
3725 suffix = "LSR";
3726 if (immed == 32)
3727 immed = 0;
3728 break;
3729 case 2:
3730 suffix = "ASR";
3731 if (immed == 32)
3732 immed = 0;
3733 break;
3734 case 3:
3735 if (immed == 0) {
3736 strcpy(cp, ", RRX");
3737 return ERROR_OK;
3738 }
3739 suffix = "ROR";
3740 break;
3741 }
3742 sprintf(cp, ", %s #%d", suffix, immed ? immed : 32);
3743 return ERROR_OK;
3744
3745 two:
3746 sprintf(cp, "%s%s.W\tr%d, r%d",
3747 mnemonic, suffix, rn, (int) (opcode & 0xf));
3748 goto shift;
3749
3750 immediate:
3751 sprintf(cp, "%s%s.W\tr%d, r%d, #%d",
3752 mnemonic, suffix, rd,
3753 (int) (opcode & 0xf), immed ? immed : 32);
3754 return ERROR_OK;
3755 }
3756
3757 static int t2ev_data_reg(uint32_t opcode, uint32_t address,
3758 arm_instruction_t *instruction, char *cp)
3759 {
3760 char *mnemonic;
3761 char * suffix = "";
3762
3763 if (((opcode >> 4) & 0xf) == 0) {
3764 switch ((opcode >> 21) & 0x7) {
3765 case 0:
3766 mnemonic = "LSL";
3767 break;
3768 case 1:
3769 mnemonic = "LSR";
3770 break;
3771 case 2:
3772 mnemonic = "ASR";
3773 break;
3774 case 3:
3775 mnemonic = "ROR";
3776 break;
3777 default:
3778 return ERROR_INVALID_ARGUMENTS;
3779 }
3780
3781 instruction->type = ARM_MOV;
3782 if (opcode & (1 << 20))
3783 suffix = "S";
3784 sprintf(cp, "%s%s.W\tr%d, r%d, r%d",
3785 mnemonic, suffix,
3786 (int) (opcode >> 8) & 0xf,
3787 (int) (opcode >> 16) & 0xf,
3788 (int) (opcode >> 0) & 0xf);
3789
3790 } else if (opcode & (1 << 7)) {
3791 switch ((opcode >> 20) & 0xf) {
3792 case 0:
3793 case 1:
3794 case 4:
3795 case 5:
3796 switch ((opcode >> 4) & 0x3) {
3797 case 1:
3798 suffix = ", ROR #8";
3799 break;
3800 case 2:
3801 suffix = ", ROR #16";
3802 break;
3803 case 3:
3804 suffix = ", ROR #24";
3805 break;
3806 }
3807 sprintf(cp, "%cXT%c.W\tr%d, r%d%s",
3808 (opcode & (1 << 24)) ? 'U' : 'S',
3809 (opcode & (1 << 26)) ? 'B' : 'H',
3810 (int) (opcode >> 8) & 0xf,
3811 (int) (opcode >> 0) & 0xf,
3812 suffix);
3813 break;
3814 case 8:
3815 case 9:
3816 case 0xa:
3817 case 0xb:
3818 if (opcode & (1 << 6))
3819 return ERROR_INVALID_ARGUMENTS;
3820 if (((opcode >> 12) & 0xf) != 0xf)
3821 return ERROR_INVALID_ARGUMENTS;
3822 if (!(opcode & (1 << 20)))
3823 return ERROR_INVALID_ARGUMENTS;
3824
3825 switch (((opcode >> 19) & 0x04)
3826 | ((opcode >> 4) & 0x3)) {
3827 case 0:
3828 mnemonic = "REV.W";
3829 break;
3830 case 1:
3831 mnemonic = "REV16.W";
3832 break;
3833 case 2:
3834 mnemonic = "RBIT";
3835 break;
3836 case 3:
3837 mnemonic = "REVSH.W";
3838 break;
3839 case 4:
3840 mnemonic = "CLZ";
3841 break;
3842 default:
3843 return ERROR_INVALID_ARGUMENTS;
3844 }
3845 sprintf(cp, "%s\tr%d, r%d",
3846 mnemonic,
3847 (int) (opcode >> 8) & 0xf,
3848 (int) (opcode >> 0) & 0xf);
3849 break;
3850 default:
3851 return ERROR_INVALID_ARGUMENTS;
3852 }
3853 }
3854
3855 return ERROR_OK;
3856 }
3857
3858 static int t2ev_load_word(uint32_t opcode, uint32_t address,
3859 arm_instruction_t *instruction, char *cp)
3860 {
3861 int rn = (opcode >> 16) & 0xf;
3862 int immed;
3863
3864 instruction->type = ARM_LDR;
3865
3866 if (rn == 0xf) {
3867 immed = opcode & 0x0fff;
3868 if ((opcode & (1 << 23)) == 0)
3869 immed = -immed;
3870 sprintf(cp, "LDR\tr%d, %#8.8" PRIx32,
3871 (int) (opcode >> 12) & 0xf,
3872 thumb_alignpc4(address) + immed);
3873 return ERROR_OK;
3874 }
3875
3876 if (opcode & (1 << 23)) {
3877 immed = opcode & 0x0fff;
3878 sprintf(cp, "LDR.W\tr%d, [r%d, #%d]\t; %#3.3x",
3879 (int) (opcode >> 12) & 0xf,
3880 rn, immed, immed);
3881 return ERROR_OK;
3882 }
3883
3884 if (!(opcode & (0x3f << 6))) {
3885 sprintf(cp, "LDR.W\tr%d, [r%d, r%d, LSL #%d]",
3886 (int) (opcode >> 12) & 0xf,
3887 rn,
3888 (int) (opcode >> 0) & 0xf,
3889 (int) (opcode >> 4) & 0x3);
3890 return ERROR_OK;
3891 }
3892
3893
3894 if (((opcode >> 8) & 0xf) == 0xe) {
3895 immed = opcode & 0x00ff;
3896
3897 sprintf(cp, "LDRT\tr%d, [r%d, #%d]\t; %#2.2x",
3898 (int) (opcode >> 12) & 0xf,
3899 rn, immed, immed);
3900 return ERROR_OK;
3901 }
3902
3903 if (((opcode >> 8) & 0xf) == 0xc || (opcode & 0x0900) == 0x0900) {
3904 char *p1 = "]", *p2 = "";
3905
3906 if (!(opcode & 0x0500))
3907 return ERROR_INVALID_ARGUMENTS;
3908
3909 immed = opcode & 0x00ff;
3910
3911 /* two indexed modes will write back rn */
3912 if (opcode & 0x100) {
3913 if (opcode & 0x400) /* pre-indexed */
3914 p2 = "]!";
3915 else { /* post-indexed */
3916 p1 = "]";
3917 p2 = "";
3918 }
3919 }
3920
3921 sprintf(cp, "LDR\tr%d, [r%d%s, #%s%u%s\t; %#2.2x",
3922 (int) (opcode >> 12) & 0xf,
3923 rn, p1,
3924 (opcode & 0x200) ? "" : "-",
3925 immed, p2, immed);
3926 return ERROR_OK;
3927 }
3928
3929 return ERROR_INVALID_ARGUMENTS;
3930 }
3931
3932 static int t2ev_load_byte_hints(uint32_t opcode, uint32_t address,
3933 arm_instruction_t *instruction, char *cp)
3934 {
3935 int rn = (opcode >> 16) & 0xf;
3936 int rt = (opcode >> 12) & 0xf;
3937 int op2 = (opcode >> 6) & 0x3f;
3938 unsigned immed;
3939 char *p1 = "", *p2 = "]";
3940 char *mnemonic;
3941
3942 switch ((opcode >> 23) & 0x3) {
3943 case 0:
3944 if ((rn & rt) == 0xf) {
3945 pld_literal:
3946 immed = opcode & 0xfff;
3947 address = thumb_alignpc4(address);
3948 if (opcode & (1 << 23))
3949 address += immed;
3950 else
3951 address -= immed;
3952 sprintf(cp, "PLD\tr%d, %#8.8" PRIx32,
3953 rt, address);
3954 return ERROR_OK;
3955 }
3956 if (rn == 0x0f && rt != 0x0f) {
3957 ldrb_literal:
3958 immed = opcode & 0xfff;
3959 address = thumb_alignpc4(address);
3960 if (opcode & (1 << 23))
3961 address += immed;
3962 else
3963 address -= immed;
3964 sprintf(cp, "LDRB\tr%d, %#8.8" PRIx32,
3965 rt, address);
3966 return ERROR_OK;
3967 }
3968 if (rn == 0x0f)
3969 break;
3970 if ((op2 & 0x3c) == 0x38) {
3971 immed = opcode & 0xff;
3972 sprintf(cp, "LDRBT\tr%d, [r%d, #%d]\t; %#2.2x",
3973 rt, rn, immed, immed);
3974 return ERROR_OK;
3975 }
3976 if ((op2 & 0x3c) == 0x30) {
3977 if (rt == 0x0f) {
3978 immed = opcode & 0xff;
3979 immed = -immed;
3980 preload_immediate:
3981 p1 = (opcode & (1 << 21)) ? "W" : "";
3982 sprintf(cp, "PLD%s\t[r%d, #%d]\t; %#6.6x",
3983 p1, rn, immed, immed);
3984 return ERROR_OK;
3985 }
3986 mnemonic = "LDRB";
3987 ldrxb_immediate_t3:
3988 immed = opcode & 0xff;
3989 if (!(opcode & 0x200))
3990 immed = -immed;
3991
3992 /* two indexed modes will write back rn */
3993 if (opcode & 0x100) {
3994 if (opcode & 0x400) /* pre-indexed */
3995 p2 = "]!";
3996 else { /* post-indexed */
3997 p1 = "]";
3998 p2 = "";
3999 }
4000 }
4001 ldrxb_immediate_t2:
4002 sprintf(cp, "%s\tr%d, [r%d%s, #%d%s\t; %#8.8x",
4003 mnemonic, rt, rn, p1,
4004 immed, p2, immed);
4005 return ERROR_OK;
4006 }
4007 if ((op2 & 0x24) == 0x24) {
4008 mnemonic = "LDRB";
4009 goto ldrxb_immediate_t3;
4010 }
4011 if (op2 == 0) {
4012 int rm = opcode & 0xf;
4013
4014 if (rt == 0x0f)
4015 sprintf(cp, "PLD\t");
4016 else
4017 sprintf(cp, "LDRB.W\tr%d, ", rt);
4018 immed = (opcode >> 4) & 0x3;
4019 cp = strchr(cp, 0);
4020 sprintf(cp, "[r%d, r%d, LSL #%d]", rn, rm, immed);
4021 return ERROR_OK;
4022 }
4023 break;
4024 case 1:
4025 if ((rn & rt) == 0xf)
4026 goto pld_literal;
4027 if (rt == 0xf) {
4028 immed = opcode & 0xfff;
4029 goto preload_immediate;
4030 }
4031 if (rn == 0x0f)
4032 goto ldrb_literal;
4033 mnemonic = "LDRB.W";
4034 immed = opcode & 0xfff;
4035 goto ldrxb_immediate_t2;
4036 case 2:
4037 if ((rn & rt) == 0xf) {
4038 immed = opcode & 0xfff;
4039 address = thumb_alignpc4(address);
4040 if (opcode & (1 << 23))
4041 address += immed;
4042 else
4043 address -= immed;
4044 sprintf(cp, "PLI\t%#8.8" PRIx32, address);
4045 return ERROR_OK;
4046 }
4047 if (rn == 0xf && rt != 0xf) {
4048 ldrsb_literal:
4049 immed = opcode & 0xfff;
4050 address = thumb_alignpc4(address);
4051 if (opcode & (1 << 23))
4052 address += immed;
4053 else
4054 address -= immed;
4055 sprintf(cp, "LDRSB\t%#8.8" PRIx32, address);
4056 return ERROR_OK;
4057 }
4058 if (rn == 0xf)
4059 break;
4060 if ((op2 & 0x3c) == 0x38) {
4061 immed = opcode & 0xff;
4062 sprintf(cp, "LDRSBT\tr%d, [r%d, #%d]\t; %#2.2x",
4063 rt, rn, immed, immed);
4064 return ERROR_OK;
4065 }
4066 if ((op2 & 0x3c) == 0x30) {
4067 if (rt == 0xf) {
4068 immed = opcode & 0xff;
4069 immed = -immed; // pli
4070 sprintf(cp, "PLI\t[r%d, #%d]\t; -%#2.2x",
4071 rn, immed, -immed);
4072 return ERROR_OK;
4073 }
4074 mnemonic = "LDRSB";
4075 goto ldrxb_immediate_t3;
4076 }
4077 if ((op2 & 0x24) == 0x24) {
4078 mnemonic = "LDRSB";
4079 goto ldrxb_immediate_t3;
4080 }
4081 if (op2 == 0) {
4082 int rm = opcode & 0xf;
4083
4084 if (rt == 0x0f)
4085 sprintf(cp, "PLI\t");
4086 else
4087 sprintf(cp, "LDRSB.W\tr%d, ", rt);
4088 immed = (opcode >> 4) & 0x3;
4089 cp = strchr(cp, 0);
4090 sprintf(cp, "[r%d, r%d, LSL #%d]", rn, rm, immed);
4091 return ERROR_OK;
4092 }
4093 break;
4094 case 3:
4095 if (rt == 0xf) {
4096 immed = opcode & 0xfff;
4097 sprintf(cp, "PLI\t[r%d, #%d]\t; %#3.3x",
4098 rn, immed, immed);
4099 return ERROR_OK;
4100 }
4101 if (rn == 0xf)
4102 goto ldrsb_literal;
4103 immed = opcode & 0xfff;
4104 mnemonic = "LDRSB";
4105 goto ldrxb_immediate_t2;
4106 }
4107
4108 return ERROR_INVALID_ARGUMENTS;
4109 }
4110
4111 static int t2ev_load_halfword(uint32_t opcode, uint32_t address,
4112 arm_instruction_t *instruction, char *cp)
4113 {
4114 int rn = (opcode >> 16) & 0xf;
4115 int rt = (opcode >> 12) & 0xf;
4116 int op2 = (opcode >> 6) & 0x3f;
4117 char *sign = "";
4118 unsigned immed;
4119
4120 if (rt == 0xf) {
4121 sprintf(cp, "HINT (UNALLOCATED)");
4122 return ERROR_OK;
4123 }
4124
4125 if (opcode & (1 << 24))
4126 sign = "S";
4127
4128 if ((opcode & (1 << 23)) == 0) {
4129 if (rn == 0xf) {
4130 ldrh_literal:
4131 immed = opcode & 0xfff;
4132 address = thumb_alignpc4(address);
4133 if (opcode & (1 << 23))
4134 address += immed;
4135 else
4136 address -= immed;
4137 sprintf(cp, "LDR%sH\tr%d, %#8.8" PRIx32,
4138 sign, rt, address);
4139 return ERROR_OK;
4140 }
4141 if (op2 == 0) {
4142 int rm = opcode & 0xf;
4143
4144 immed = (opcode >> 4) & 0x3;
4145 sprintf(cp, "LDR%sH.W\tr%d, [r%d, r%d, LSL #%d]",
4146 sign, rt, rn, rm, immed);
4147 return ERROR_OK;
4148 }
4149 if ((op2 & 0x3c) == 0x38) {
4150 immed = opcode & 0xff;
4151 sprintf(cp, "LDR%sHT\tr%d, [r%d, #%d]\t; %#2.2x",
4152 sign, rt, rn, immed, immed);
4153 return ERROR_OK;
4154 }
4155 if ((op2 & 0x3c) == 0x30 || (op2 & 0x24) == 0x24) {
4156 char *p1 = "", *p2 = "]";
4157
4158 immed = opcode & 0xff;
4159 if (!(opcode & 0x200))
4160 immed = -immed;
4161
4162 /* two indexed modes will write back rn */
4163 if (opcode & 0x100) {
4164 if (opcode & 0x400) /* pre-indexed */
4165 p2 = "]!";
4166 else { /* post-indexed */
4167 p1 = "]";
4168 p2 = "";
4169 }
4170 }
4171 sprintf(cp, "LDR%sH\tr%d, [r%d%s, #%d%s\t; %#8.8x",
4172 sign, rt, rn, p1, immed, p2, immed);
4173 return ERROR_OK;
4174 }
4175 } else {
4176 if (rn == 0xf)
4177 goto ldrh_literal;
4178
4179 immed = opcode & 0xfff;
4180 sprintf(cp, "LDR%sH%s\tr%d, [r%d, #%d]\t; %#6.6x",
4181 sign, *sign ? "" : ".W",
4182 rt, rn, immed, immed);
4183 return ERROR_OK;
4184 }
4185
4186 return ERROR_INVALID_ARGUMENTS;
4187 }
4188
4189 /*
4190 * REVISIT for Thumb2 instructions, instruction->type and friends aren't
4191 * always set. That means eventual arm_simulate_step() support for Thumb2
4192 * will need work in this area.
4193 */
4194 int thumb2_opcode(target_t *target, uint32_t address, arm_instruction_t *instruction)
4195 {
4196 int retval;
4197 uint16_t op;
4198 uint32_t opcode;
4199 char *cp;
4200
4201 /* clear low bit ... it's set on function pointers */
4202 address &= ~1;
4203
4204 /* clear fields, to avoid confusion */
4205 memset(instruction, 0, sizeof(arm_instruction_t));
4206
4207 /* read first halfword, see if this is the only one */
4208 retval = target_read_u16(target, address, &op);
4209 if (retval != ERROR_OK)
4210 return retval;
4211
4212 switch (op & 0xf800) {
4213 case 0xf800:
4214 case 0xf000:
4215 case 0xe800:
4216 /* 32-bit instructions */
4217 instruction->instruction_size = 4;
4218 opcode = op << 16;
4219 retval = target_read_u16(target, address + 2, &op);
4220 if (retval != ERROR_OK)
4221 return retval;
4222 opcode |= op;
4223 instruction->opcode = opcode;
4224 break;
4225 default:
4226 /* 16-bit: Thumb1 + IT + CBZ/CBNZ + ... */
4227 return thumb_evaluate_opcode(op, address, instruction);
4228 }
4229
4230 snprintf(instruction->text, 128,
4231 "0x%8.8" PRIx32 " 0x%8.8" PRIx32 "\t",
4232 address, opcode);
4233 cp = strchr(instruction->text, 0);
4234 retval = ERROR_FAIL;
4235
4236 /* ARMv7-M: A5.3.1 Data processing (modified immediate) */
4237 if ((opcode & 0x1a008000) == 0x10000000)
4238 retval = t2ev_data_mod_immed(opcode, address, instruction, cp);
4239
4240 /* ARMv7-M: A5.3.3 Data processing (plain binary immediate) */
4241 else if ((opcode & 0x1a008000) == 0x12000000)
4242 retval = t2ev_data_immed(opcode, address, instruction, cp);
4243
4244 /* ARMv7-M: A5.3.4 Branches and miscellaneous control */
4245 else if ((opcode & 0x18008000) == 0x10008000)
4246 retval = t2ev_b_misc(opcode, address, instruction, cp);
4247
4248 /* ARMv7-M: A5.3.5 Load/store multiple */
4249 else if ((opcode & 0x1e400000) == 0x08000000)
4250 retval = t2ev_ldm_stm(opcode, address, instruction, cp);
4251
4252 /* ARMv7-M: A5.3.6 Load/store dual or exclusive, table branch */
4253 else if ((opcode & 0x1e400000) == 0x08400000)
4254 retval = t2ev_ldrex_strex(opcode, address, instruction, cp);
4255
4256 /* ARMv7-M: A5.3.7 Load word */
4257 else if ((opcode & 0x1f700000) == 0x18500000)
4258 retval = t2ev_load_word(opcode, address, instruction, cp);
4259
4260 /* ARMv7-M: A5.3.8 Load halfword, unallocated memory hints */
4261 else if ((opcode & 0x1e700000) == 0x18300000)
4262 retval = t2ev_load_halfword(opcode, address, instruction, cp);
4263
4264 /* ARMv7-M: A5.3.9 Load byte, memory hints */
4265 else if ((opcode & 0x1e700000) == 0x18100000)
4266 retval = t2ev_load_byte_hints(opcode, address, instruction, cp);
4267
4268 /* ARMv7-M: A5.3.10 Store single data item */
4269 else if ((opcode & 0x1f100000) == 0x18000000)
4270 retval = t2ev_store_single(opcode, address, instruction, cp);
4271
4272 /* ARMv7-M: A5.3.11 Data processing (shifted register) */
4273 else if ((opcode & 0x1e000000) == 0x0a000000)
4274 retval = t2ev_data_shift(opcode, address, instruction, cp);
4275
4276 /* ARMv7-M: A5.3.12 Data processing (register)
4277 * and A5.3.13 Miscellaneous operations
4278 */
4279 else if ((opcode & 0x1f000000) == 0x1a000000)
4280 retval = t2ev_data_reg(opcode, address, instruction, cp);
4281
4282 /* ARMv7-M: A5.3.14 Multiply, and multiply accumulate */
4283 else if ((opcode & 0x1f800000) == 0x1b000000)
4284 retval = t2ev_mul32(opcode, address, instruction, cp);
4285
4286 /* ARMv7-M: A5.3.15 Long multiply, long multiply accumulate, divide */
4287 else if ((opcode & 0x1f800000) == 0x1b800000)
4288 retval = t2ev_mul64_div(opcode, address, instruction, cp);
4289
4290 if (retval == ERROR_OK)
4291 return retval;
4292
4293 /*
4294 * Thumb2 also supports coprocessor, ThumbEE, and DSP/Media (SIMD)
4295 * instructions; not yet handled here.
4296 */
4297
4298 if (retval == ERROR_INVALID_ARGUMENTS) {
4299 instruction->type = ARM_UNDEFINED_INSTRUCTION;
4300 strcpy(cp, "UNDEFINED OPCODE");
4301 return ERROR_OK;
4302 }
4303
4304 LOG_DEBUG("Can't decode 32-bit Thumb2 yet (opcode=%08" PRIx32 ")",
4305 opcode);
4306
4307 strcpy(cp, "(32-bit Thumb2 ...)");
4308 return ERROR_OK;
4309 }
4310
4311 int arm_access_size(arm_instruction_t *instruction)
4312 {
4313 if ((instruction->type == ARM_LDRB)
4314 || (instruction->type == ARM_LDRBT)
4315 || (instruction->type == ARM_LDRSB)
4316 || (instruction->type == ARM_STRB)
4317 || (instruction->type == ARM_STRBT))
4318 {
4319 return 1;
4320 }
4321 else if ((instruction->type == ARM_LDRH)
4322 || (instruction->type == ARM_LDRSH)
4323 || (instruction->type == ARM_STRH))
4324 {
4325 return 2;
4326 }
4327 else if ((instruction->type == ARM_LDR)
4328 || (instruction->type == ARM_LDRT)
4329 || (instruction->type == ARM_STR)
4330 || (instruction->type == ARM_STRT))
4331 {
4332 return 4;
4333 }
4334 else if ((instruction->type == ARM_LDRD)
4335 || (instruction->type == ARM_STRD))
4336 {
4337 return 8;
4338 }
4339 else
4340 {
4341 LOG_ERROR("BUG: instruction type %i isn't a load/store instruction", instruction->type);
4342 return 0;
4343 }
4344 }
temporary implementation of SWD support of STM32 based on Versaloon