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ARM: keep a handle to the PC
[openocd/dave.git] / src / target / armv4_5.c
bloba4a15b40df695b4b64767d45d7d38ce207ccced3
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2008 by Spencer Oliver *
6 * spen@spen-soft.co.uk *
7 * *
8 * Copyright (C) 2008 by Oyvind Harboe *
9 * oyvind.harboe@zylin.com *
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
20 * *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program; if not, write to the *
23 * Free Software Foundation, Inc., *
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 ***************************************************************************/
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include "arm.h"
31 #include "armv4_5.h"
32 #include "arm_jtag.h"
33 #include "breakpoints.h"
34 #include "arm_disassembler.h"
35 #include <helper/binarybuffer.h>
36 #include "algorithm.h"
37 #include "register.h"
38
39
40 /* offsets into armv4_5 core register cache */
41 enum {
42 // ARMV4_5_CPSR = 31,
43 ARMV4_5_SPSR_FIQ = 32,
44 ARMV4_5_SPSR_IRQ = 33,
45 ARMV4_5_SPSR_SVC = 34,
46 ARMV4_5_SPSR_ABT = 35,
47 ARMV4_5_SPSR_UND = 36,
48 ARM_SPSR_MON = 39,
49 };
50
51 static const uint8_t arm_usr_indices[17] = {
52 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, ARMV4_5_CPSR,
53 };
54
55 static const uint8_t arm_fiq_indices[8] = {
56 16, 17, 18, 19, 20, 21, 22, ARMV4_5_SPSR_FIQ,
57 };
58
59 static const uint8_t arm_irq_indices[3] = {
60 23, 24, ARMV4_5_SPSR_IRQ,
61 };
62
63 static const uint8_t arm_svc_indices[3] = {
64 25, 26, ARMV4_5_SPSR_SVC,
65 };
66
67 static const uint8_t arm_abt_indices[3] = {
68 27, 28, ARMV4_5_SPSR_ABT,
69 };
70
71 static const uint8_t arm_und_indices[3] = {
72 29, 30, ARMV4_5_SPSR_UND,
73 };
74
75 static const uint8_t arm_mon_indices[3] = {
76 37, 38, ARM_SPSR_MON,
77 };
78
79 static const struct {
80 const char *name;
81 unsigned short psr;
82 /* For user and system modes, these list indices for all registers.
83 * otherwise they're just indices for the shadow registers and SPSR.
84 */
85 unsigned short n_indices;
86 const uint8_t *indices;
87 } arm_mode_data[] = {
88 /* Seven modes are standard from ARM7 on. "System" and "User" share
89 * the same registers; other modes shadow from 3 to 8 registers.
90 */
91 {
92 .name = "User",
93 .psr = ARM_MODE_USR,
94 .n_indices = ARRAY_SIZE(arm_usr_indices),
95 .indices = arm_usr_indices,
96 },
97 {
98 .name = "FIQ",
99 .psr = ARM_MODE_FIQ,
100 .n_indices = ARRAY_SIZE(arm_fiq_indices),
101 .indices = arm_fiq_indices,
102 },
103 {
104 .name = "Supervisor",
105 .psr = ARM_MODE_SVC,
106 .n_indices = ARRAY_SIZE(arm_svc_indices),
107 .indices = arm_svc_indices,
108 },
109 {
110 .name = "Abort",
111 .psr = ARM_MODE_ABT,
112 .n_indices = ARRAY_SIZE(arm_abt_indices),
113 .indices = arm_abt_indices,
114 },
115 {
116 .name = "IRQ",
117 .psr = ARM_MODE_IRQ,
118 .n_indices = ARRAY_SIZE(arm_irq_indices),
119 .indices = arm_irq_indices,
120 },
121 {
122 .name = "Undefined instruction",
123 .psr = ARM_MODE_UND,
124 .n_indices = ARRAY_SIZE(arm_und_indices),
125 .indices = arm_und_indices,
126 },
127 {
128 .name = "System",
129 .psr = ARM_MODE_SYS,
130 .n_indices = ARRAY_SIZE(arm_usr_indices),
131 .indices = arm_usr_indices,
132 },
133 /* TrustZone "Security Extensions" add a secure monitor mode.
134 * This is distinct from a "debug monitor" which can support
135 * non-halting debug, in conjunction with some debuggers.
136 */
137 {
138 .name = "Secure Monitor",
139 .psr = ARM_MODE_MON,
140 .n_indices = ARRAY_SIZE(arm_mon_indices),
141 .indices = arm_mon_indices,
142 },
143 };
144
145 /** Map PSR mode bits to the name of an ARM processor operating mode. */
146 const char *arm_mode_name(unsigned psr_mode)
147 {
148 for (unsigned i = 0; i < ARRAY_SIZE(arm_mode_data); i++) {
149 if (arm_mode_data[i].psr == psr_mode)
150 return arm_mode_data[i].name;
151 }
152 LOG_ERROR("unrecognized psr mode: %#02x", psr_mode);
153 return "UNRECOGNIZED";
154 }
155
156 /** Return true iff the parameter denotes a valid ARM processor mode. */
157 bool is_arm_mode(unsigned psr_mode)
158 {
159 for (unsigned i = 0; i < ARRAY_SIZE(arm_mode_data); i++) {
160 if (arm_mode_data[i].psr == psr_mode)
161 return true;
162 }
163 return false;
164 }
165
166 /** Map PSR mode bits to linear number indexing armv4_5_core_reg_map */
167 int arm_mode_to_number(enum arm_mode mode)
168 {
169 switch (mode) {
170 case ARM_MODE_ANY:
171 /* map MODE_ANY to user mode */
172 case ARM_MODE_USR:
173 return 0;
174 case ARM_MODE_FIQ:
175 return 1;
176 case ARM_MODE_IRQ:
177 return 2;
178 case ARM_MODE_SVC:
179 return 3;
180 case ARM_MODE_ABT:
181 return 4;
182 case ARM_MODE_UND:
183 return 5;
184 case ARM_MODE_SYS:
185 return 6;
186 case ARM_MODE_MON:
187 return 7;
188 default:
189 LOG_ERROR("invalid mode value encountered %d", mode);
190 return -1;
191 }
192 }
193
194 /** Map linear number indexing armv4_5_core_reg_map to PSR mode bits. */
195 enum arm_mode armv4_5_number_to_mode(int number)
196 {
197 switch (number) {
198 case 0:
199 return ARM_MODE_USR;
200 case 1:
201 return ARM_MODE_FIQ;
202 case 2:
203 return ARM_MODE_IRQ;
204 case 3:
205 return ARM_MODE_SVC;
206 case 4:
207 return ARM_MODE_ABT;
208 case 5:
209 return ARM_MODE_UND;
210 case 6:
211 return ARM_MODE_SYS;
212 case 7:
213 return ARM_MODE_MON;
214 default:
215 LOG_ERROR("mode index out of bounds %d", number);
216 return ARM_MODE_ANY;
217 }
218 }
219
220 const char *arm_state_strings[] =
221 {
222 "ARM", "Thumb", "Jazelle", "ThumbEE",
223 };
224
225 /* Templates for ARM core registers.
226 *
227 * NOTE: offsets in this table are coupled to the arm_mode_data
228 * table above, the armv4_5_core_reg_map array below, and also to
229 * the ARMV4_5_CPSR symbol (which should vanish after ARM11 updates).
230 */
231 static const struct {
232 /* The name is used for e.g. the "regs" command. */
233 const char *name;
234
235 /* The {cookie, mode} tuple uniquely identifies one register.
236 * In a given mode, cookies 0..15 map to registers R0..R15,
237 * with R13..R15 usually called SP, LR, PC.
238 *
239 * MODE_ANY is used as *input* to the mapping, and indicates
240 * various special cases (sigh) and errors.
241 *
242 * Cookie 16 is (currently) confusing, since it indicates
243 * CPSR -or- SPSR depending on whether 'mode' is MODE_ANY.
244 * (Exception modes have both CPSR and SPSR registers ...)
245 */
246 unsigned cookie;
247 enum arm_mode mode;
248 } arm_core_regs[] = {
249 /* IMPORTANT: we guarantee that the first eight cached registers
250 * correspond to r0..r7, and the fifteenth to PC, so that callers
251 * don't need to map them.
252 */
253 { .name = "r0", .cookie = 0, .mode = ARM_MODE_ANY, },
254 { .name = "r1", .cookie = 1, .mode = ARM_MODE_ANY, },
255 { .name = "r2", .cookie = 2, .mode = ARM_MODE_ANY, },
256 { .name = "r3", .cookie = 3, .mode = ARM_MODE_ANY, },
257 { .name = "r4", .cookie = 4, .mode = ARM_MODE_ANY, },
258 { .name = "r5", .cookie = 5, .mode = ARM_MODE_ANY, },
259 { .name = "r6", .cookie = 6, .mode = ARM_MODE_ANY, },
260 { .name = "r7", .cookie = 7, .mode = ARM_MODE_ANY, },
261
262 /* NOTE: regs 8..12 might be shadowed by FIQ ... flagging
263 * them as MODE_ANY creates special cases. (ANY means
264 * "not mapped" elsewhere; here it's "everything but FIQ".)
265 */
266 { .name = "r8", .cookie = 8, .mode = ARM_MODE_ANY, },
267 { .name = "r9", .cookie = 9, .mode = ARM_MODE_ANY, },
268 { .name = "r10", .cookie = 10, .mode = ARM_MODE_ANY, },
269 { .name = "r11", .cookie = 11, .mode = ARM_MODE_ANY, },
270 { .name = "r12", .cookie = 12, .mode = ARM_MODE_ANY, },
271
272 /* NOTE all MODE_USR registers are equivalent to MODE_SYS ones */
273 { .name = "sp_usr", .cookie = 13, .mode = ARM_MODE_USR, },
274 { .name = "lr_usr", .cookie = 14, .mode = ARM_MODE_USR, },
275
276 /* guaranteed to be at index 15 */
277 { .name = "pc", .cookie = 15, .mode = ARM_MODE_ANY, },
278
279 { .name = "r8_fiq", .cookie = 8, .mode = ARM_MODE_FIQ, },
280 { .name = "r9_fiq", .cookie = 9, .mode = ARM_MODE_FIQ, },
281 { .name = "r10_fiq", .cookie = 10, .mode = ARM_MODE_FIQ, },
282 { .name = "r11_fiq", .cookie = 11, .mode = ARM_MODE_FIQ, },
283 { .name = "r12_fiq", .cookie = 12, .mode = ARM_MODE_FIQ, },
284
285 { .name = "sp_fiq", .cookie = 13, .mode = ARM_MODE_FIQ, },
286 { .name = "lr_fiq", .cookie = 14, .mode = ARM_MODE_FIQ, },
287
288 { .name = "sp_irq", .cookie = 13, .mode = ARM_MODE_IRQ, },
289 { .name = "lr_irq", .cookie = 14, .mode = ARM_MODE_IRQ, },
290
291 { .name = "sp_svc", .cookie = 13, .mode = ARM_MODE_SVC, },
292 { .name = "lr_svc", .cookie = 14, .mode = ARM_MODE_SVC, },
293
294 { .name = "sp_abt", .cookie = 13, .mode = ARM_MODE_ABT, },
295 { .name = "lr_abt", .cookie = 14, .mode = ARM_MODE_ABT, },
296
297 { .name = "sp_und", .cookie = 13, .mode = ARM_MODE_UND, },
298 { .name = "lr_und", .cookie = 14, .mode = ARM_MODE_UND, },
299
300 { .name = "cpsr", .cookie = 16, .mode = ARM_MODE_ANY, },
301 { .name = "spsr_fiq", .cookie = 16, .mode = ARM_MODE_FIQ, },
302 { .name = "spsr_irq", .cookie = 16, .mode = ARM_MODE_IRQ, },
303 { .name = "spsr_svc", .cookie = 16, .mode = ARM_MODE_SVC, },
304 { .name = "spsr_abt", .cookie = 16, .mode = ARM_MODE_ABT, },
305 { .name = "spsr_und", .cookie = 16, .mode = ARM_MODE_UND, },
306
307 { .name = "sp_mon", .cookie = 13, .mode = ARM_MODE_MON, },
308 { .name = "lr_mon", .cookie = 14, .mode = ARM_MODE_MON, },
309 { .name = "spsr_mon", .cookie = 16, .mode = ARM_MODE_MON, },
310 };
311
312 /* map core mode (USR, FIQ, ...) and register number to
313 * indices into the register cache
314 */
315 const int armv4_5_core_reg_map[8][17] =
316 {
317 { /* USR */
318 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
319 },
320 { /* FIQ (8 shadows of USR, vs normal 3) */
321 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 15, 32
322 },
323 { /* IRQ */
324 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24, 15, 33
325 },
326 { /* SVC */
327 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26, 15, 34
328 },
329 { /* ABT */
330 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27, 28, 15, 35
331 },
332 { /* UND */
333 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29, 30, 15, 36
334 },
335 { /* SYS (same registers as USR) */
336 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
337 },
338 { /* MON */
339 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 37, 38, 15, 39,
340 }
341 };
342
343 /**
344 * Configures host-side ARM records to reflect the specified CPSR.
345 * Later, code can use arm_reg_current() to map register numbers
346 * according to how they are exposed by this mode.
347 */
348 void arm_set_cpsr(struct arm *arm, uint32_t cpsr)
349 {
350 enum arm_mode mode = cpsr & 0x1f;
351 int num;
352
353 /* NOTE: this may be called very early, before the register
354 * cache is set up. We can't defend against many errors, in
355 * particular against CPSRs that aren't valid *here* ...
356 */
357 if (arm->cpsr) {
358 buf_set_u32(arm->cpsr->value, 0, 32, cpsr);
359 arm->cpsr->valid = 1;
360 arm->cpsr->dirty = 0;
361 }
362
363 arm->core_mode = mode;
364
365 /* mode_to_number() warned; set up a somewhat-sane mapping */
366 num = arm_mode_to_number(mode);
367 if (num < 0) {
368 mode = ARM_MODE_USR;
369 num = 0;
370 }
371
372 arm->map = &armv4_5_core_reg_map[num][0];
373 arm->spsr = (mode == ARM_MODE_USR || mode == ARM_MODE_SYS)
374 ? NULL
375 : arm->core_cache->reg_list + arm->map[16];
376
377 /* Older ARMs won't have the J bit */
378 enum arm_state state;
379
380 if (cpsr & (1 << 5)) { /* T */
381 if (cpsr & (1 << 24)) { /* J */
382 LOG_WARNING("ThumbEE -- incomplete support");
383 state = ARM_STATE_THUMB_EE;
384 } else
385 state = ARM_STATE_THUMB;
386 } else {
387 if (cpsr & (1 << 24)) { /* J */
388 LOG_ERROR("Jazelle state handling is BROKEN!");
389 state = ARM_STATE_JAZELLE;
390 } else
391 state = ARM_STATE_ARM;
392 }
393 arm->core_state = state;
394
395 LOG_DEBUG("set CPSR %#8.8x: %s mode, %s state", (unsigned) cpsr,
396 arm_mode_name(mode),
397 arm_state_strings[arm->core_state]);
398 }
399
400 /**
401 * Returns handle to the register currently mapped to a given number.
402 * Someone must have called arm_set_cpsr() before.
403 *
404 * \param arm This core's state and registers are used.
405 * \param regnum From 0..15 corresponding to R0..R14 and PC.
406 * Note that R0..R7 don't require mapping; you may access those
407 * as the first eight entries in the register cache. Likewise
408 * R15 (PC) doesn't need mapping; you may also access it directly.
409 * However, R8..R14, and SPSR (arm->spsr) *must* be mapped.
410 * CPSR (arm->cpsr) is also not mapped.
411 */
412 struct reg *arm_reg_current(struct arm *arm, unsigned regnum)
413 {
414 struct reg *r;
415
416 if (regnum > 16)
417 return NULL;
418
419 r = arm->core_cache->reg_list + arm->map[regnum];
420
421 /* e.g. invalid CPSR said "secure monitor" mode on a core
422 * that doesn't support it...
423 */
424 if (!r) {
425 LOG_ERROR("Invalid CPSR mode");
426 r = arm->core_cache->reg_list + regnum;
427 }
428
429 return r;
430 }
431
432 static const uint8_t arm_gdb_dummy_fp_value[12];
433
434 /**
435 * Dummy FPA registers are required to support GDB on ARM.
436 * Register packets require eight obsolete FPA register values.
437 * Modern ARM cores use Vector Floating Point (VFP), if they
438 * have any floating point support. VFP is not FPA-compatible.
439 */
440 struct reg arm_gdb_dummy_fp_reg =
441 {
442 .name = "GDB dummy FPA register",
443 .value = (uint8_t *) arm_gdb_dummy_fp_value,
444 .valid = 1,
445 .size = 96,
446 };
447
448 static const uint8_t arm_gdb_dummy_fps_value[4];
449
450 /**
451 * Dummy FPA status registers are required to support GDB on ARM.
452 * Register packets require an obsolete FPA status register.
453 */
454 struct reg arm_gdb_dummy_fps_reg =
455 {
456 .name = "GDB dummy FPA status register",
457 .value = (uint8_t *) arm_gdb_dummy_fps_value,
458 .valid = 1,
459 .size = 32,
460 };
461
462 static void arm_gdb_dummy_init(void) __attribute__ ((constructor));
463
464 static void arm_gdb_dummy_init(void)
465 {
466 register_init_dummy(&arm_gdb_dummy_fp_reg);
467 register_init_dummy(&arm_gdb_dummy_fps_reg);
468 }
469
470 static int armv4_5_get_core_reg(struct reg *reg)
471 {
472 int retval;
473 struct arm_reg *armv4_5 = reg->arch_info;
474 struct target *target = armv4_5->target;
475
476 if (target->state != TARGET_HALTED)
477 {
478 LOG_ERROR("Target not halted");
479 return ERROR_TARGET_NOT_HALTED;
480 }
481
482 retval = armv4_5->armv4_5_common->read_core_reg(target, reg, armv4_5->num, armv4_5->mode);
483 if (retval == ERROR_OK) {
484 reg->valid = 1;
485 reg->dirty = 0;
486 }
487
488 return retval;
489 }
490
491 static int armv4_5_set_core_reg(struct reg *reg, uint8_t *buf)
492 {
493 struct arm_reg *armv4_5 = reg->arch_info;
494 struct target *target = armv4_5->target;
495 struct arm *armv4_5_target = target_to_arm(target);
496 uint32_t value = buf_get_u32(buf, 0, 32);
497
498 if (target->state != TARGET_HALTED)
499 {
500 LOG_ERROR("Target not halted");
501 return ERROR_TARGET_NOT_HALTED;
502 }
503
504 /* Except for CPSR, the "reg" command exposes a writeback model
505 * for the register cache.
506 */
507 if (reg == armv4_5_target->cpsr) {
508 arm_set_cpsr(armv4_5_target, value);
509
510 /* Older cores need help to be in ARM mode during halt
511 * mode debug, so we clear the J and T bits if we flush.
512 * For newer cores (v6/v7a/v7r) we don't need that, but
513 * it won't hurt since CPSR is always flushed anyway.
514 */
515 if (armv4_5_target->core_mode !=
516 (enum arm_mode)(value & 0x1f)) {
517 LOG_DEBUG("changing ARM core mode to '%s'",
518 arm_mode_name(value & 0x1f));
519 value &= ~((1 << 24) | (1 << 5));
520 armv4_5_target->write_core_reg(target, reg,
521 16, ARM_MODE_ANY, value);
522 }
523 } else {
524 buf_set_u32(reg->value, 0, 32, value);
525 reg->valid = 1;
526 }
527 reg->dirty = 1;
528
529 return ERROR_OK;
530 }
531
532 static const struct reg_arch_type arm_reg_type = {
533 .get = armv4_5_get_core_reg,
534 .set = armv4_5_set_core_reg,
535 };
536
537 struct reg_cache *arm_build_reg_cache(struct target *target, struct arm *arm)
538 {
539 int num_regs = ARRAY_SIZE(arm_core_regs);
540 struct reg_cache *cache = malloc(sizeof(struct reg_cache));
541 struct reg *reg_list = calloc(num_regs, sizeof(struct reg));
542 struct arm_reg *arch_info = calloc(num_regs, sizeof(struct arm_reg));
543 int i;
544
545 if (!cache || !reg_list || !arch_info) {
546 free(cache);
547 free(reg_list);
548 free(arch_info);
549 return NULL;
550 }
551
552 cache->name = "ARM registers";
553 cache->next = NULL;
554 cache->reg_list = reg_list;
555 cache->num_regs = 0;
556
557 for (i = 0; i < num_regs; i++)
558 {
559 /* Skip registers this core doesn't expose */
560 if (arm_core_regs[i].mode == ARM_MODE_MON
561 && arm->core_type != ARM_MODE_MON)
562 continue;
563
564 /* REVISIT handle Cortex-M, which only shadows R13/SP */
565
566 arch_info[i].num = arm_core_regs[i].cookie;
567 arch_info[i].mode = arm_core_regs[i].mode;
568 arch_info[i].target = target;
569 arch_info[i].armv4_5_common = arm;
570
571 reg_list[i].name = (char *) arm_core_regs[i].name;
572 reg_list[i].size = 32;
573 reg_list[i].value = &arch_info[i].value;
574 reg_list[i].type = &arm_reg_type;
575 reg_list[i].arch_info = &arch_info[i];
576
577 cache->num_regs++;
578 }
579
580 arm->pc = reg_list + 15;
581 arm->cpsr = reg_list + ARMV4_5_CPSR;
582 arm->core_cache = cache;
583 return cache;
584 }
585
586 int arm_arch_state(struct target *target)
587 {
588 struct arm *armv4_5 = target_to_arm(target);
589
590 if (armv4_5->common_magic != ARM_COMMON_MAGIC)
591 {
592 LOG_ERROR("BUG: called for a non-ARM target");
593 return ERROR_FAIL;
594 }
595
596 LOG_USER("target halted in %s state due to %s, current mode: %s\n"
597 "cpsr: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "%s",
598 arm_state_strings[armv4_5->core_state],
599 debug_reason_name(target),
600 arm_mode_name(armv4_5->core_mode),
601 buf_get_u32(armv4_5->cpsr->value, 0, 32),
602 buf_get_u32(armv4_5->pc->value, 0, 32),
603 armv4_5->is_semihosting ? ", semihosting" : "");
604
605 return ERROR_OK;
606 }
607
608 #define ARMV4_5_CORE_REG_MODENUM(cache, mode, num) \
609 cache->reg_list[armv4_5_core_reg_map[mode][num]]
610
611 COMMAND_HANDLER(handle_armv4_5_reg_command)
612 {
613 struct target *target = get_current_target(CMD_CTX);
614 struct arm *armv4_5 = target_to_arm(target);
615 unsigned num_regs;
616 struct reg *regs;
617
618 if (!is_arm(armv4_5))
619 {
620 command_print(CMD_CTX, "current target isn't an ARM");
621 return ERROR_FAIL;
622 }
623
624 if (target->state != TARGET_HALTED)
625 {
626 command_print(CMD_CTX, "error: target must be halted for register accesses");
627 return ERROR_FAIL;
628 }
629
630 if (!is_arm_mode(armv4_5->core_mode))
631 return ERROR_FAIL;
632
633 if (!armv4_5->full_context) {
634 command_print(CMD_CTX, "error: target doesn't support %s",
635 CMD_NAME);
636 return ERROR_FAIL;
637 }
638
639 num_regs = armv4_5->core_cache->num_regs;
640 regs = armv4_5->core_cache->reg_list;
641
642 for (unsigned mode = 0; mode < ARRAY_SIZE(arm_mode_data); mode++) {
643 const char *name;
644 char *sep = "\n";
645 char *shadow = "";
646
647 /* label this bank of registers (or shadows) */
648 switch (arm_mode_data[mode].psr) {
649 case ARM_MODE_SYS:
650 continue;
651 case ARM_MODE_USR:
652 name = "System and User";
653 sep = "";
654 break;
655 case ARM_MODE_MON:
656 if (armv4_5->core_type != ARM_MODE_MON)
657 continue;
658 /* FALLTHROUGH */
659 default:
660 name = arm_mode_data[mode].name;
661 shadow = "shadow ";
662 break;
663 }
664 command_print(CMD_CTX, "%s%s mode %sregisters",
665 sep, name, shadow);
666
667 /* display N rows of up to 4 registers each */
668 for (unsigned i = 0; i < arm_mode_data[mode].n_indices;) {
669 char output[80];
670 int output_len = 0;
671
672 for (unsigned j = 0; j < 4; j++, i++) {
673 uint32_t value;
674 struct reg *reg = regs;
675
676 if (i >= arm_mode_data[mode].n_indices)
677 break;
678
679 reg += arm_mode_data[mode].indices[i];
680
681 /* REVISIT be smarter about faults... */
682 if (!reg->valid)
683 armv4_5->full_context(target);
684
685 value = buf_get_u32(reg->value, 0, 32);
686 output_len += snprintf(output + output_len,
687 sizeof(output) - output_len,
688 "%8s: %8.8" PRIx32 " ",
689 reg->name, value);
690 }
691 command_print(CMD_CTX, "%s", output);
692 }
693 }
694
695 return ERROR_OK;
696 }
697
698 COMMAND_HANDLER(handle_armv4_5_core_state_command)
699 {
700 struct target *target = get_current_target(CMD_CTX);
701 struct arm *armv4_5 = target_to_arm(target);
702
703 if (!is_arm(armv4_5))
704 {
705 command_print(CMD_CTX, "current target isn't an ARM");
706 return ERROR_FAIL;
707 }
708
709 if (CMD_ARGC > 0)
710 {
711 if (strcmp(CMD_ARGV[0], "arm") == 0)
712 {
713 armv4_5->core_state = ARM_STATE_ARM;
714 }
715 if (strcmp(CMD_ARGV[0], "thumb") == 0)
716 {
717 armv4_5->core_state = ARM_STATE_THUMB;
718 }
719 }
720
721 command_print(CMD_CTX, "core state: %s", arm_state_strings[armv4_5->core_state]);
722
723 return ERROR_OK;
724 }
725
726 COMMAND_HANDLER(handle_armv4_5_disassemble_command)
727 {
728 int retval = ERROR_OK;
729 struct target *target = get_current_target(CMD_CTX);
730 struct arm *arm = target ? target_to_arm(target) : NULL;
731 uint32_t address;
732 int count = 1;
733 int thumb = 0;
734
735 if (!is_arm(arm)) {
736 command_print(CMD_CTX, "current target isn't an ARM");
737 return ERROR_FAIL;
738 }
739
740 switch (CMD_ARGC) {
741 case 3:
742 if (strcmp(CMD_ARGV[2], "thumb") != 0)
743 goto usage;
744 thumb = 1;
745 /* FALL THROUGH */
746 case 2:
747 COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], count);
748 /* FALL THROUGH */
749 case 1:
750 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], address);
751 if (address & 0x01) {
752 if (!thumb) {
753 command_print(CMD_CTX, "Disassemble as Thumb");
754 thumb = 1;
755 }
756 address &= ~1;
757 }
758 break;
759 default:
760 usage:
761 command_print(CMD_CTX,
762 "usage: arm disassemble <address> [<count> ['thumb']]");
763 count = 0;
764 retval = ERROR_FAIL;
765 }
766
767 while (count-- > 0) {
768 struct arm_instruction cur_instruction;
769
770 if (thumb) {
771 /* Always use Thumb2 disassembly for best handling
772 * of 32-bit BL/BLX, and to work with newer cores
773 * (some ARMv6, all ARMv7) that use Thumb2.
774 */
775 retval = thumb2_opcode(target, address,
776 &cur_instruction);
777 if (retval != ERROR_OK)
778 break;
779 } else {
780 uint32_t opcode;
781
782 retval = target_read_u32(target, address, &opcode);
783 if (retval != ERROR_OK)
784 break;
785 retval = arm_evaluate_opcode(opcode, address,
786 &cur_instruction) != ERROR_OK;
787 if (retval != ERROR_OK)
788 break;
789 }
790 command_print(CMD_CTX, "%s", cur_instruction.text);
791 address += cur_instruction.instruction_size;
792 }
793
794 return retval;
795 }
796
797 static int jim_mcrmrc(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
798 {
799 struct command_context *context;
800 struct target *target;
801 struct arm *arm;
802 int retval;
803
804 context = Jim_GetAssocData(interp, "context");
805 if (context == NULL) {
806 LOG_ERROR("%s: no command context", __func__);
807 return JIM_ERR;
808 }
809 target = get_current_target(context);
810 if (target == NULL) {
811 LOG_ERROR("%s: no current target", __func__);
812 return JIM_ERR;
813 }
814 if (!target_was_examined(target)) {
815 LOG_ERROR("%s: not yet examined", target_name(target));
816 return JIM_ERR;
817 }
818 arm = target_to_arm(target);
819 if (!is_arm(arm)) {
820 LOG_ERROR("%s: not an ARM", target_name(target));
821 return JIM_ERR;
822 }
823
824 if ((argc < 6) || (argc > 7)) {
825 /* FIXME use the command name to verify # params... */
826 LOG_ERROR("%s: wrong number of arguments", __func__);
827 return JIM_ERR;
828 }
829
830 int cpnum;
831 uint32_t op1;
832 uint32_t op2;
833 uint32_t CRn;
834 uint32_t CRm;
835 uint32_t value;
836 long l;
837
838 /* NOTE: parameter sequence matches ARM instruction set usage:
839 * MCR pNUM, op1, rX, CRn, CRm, op2 ; write CP from rX
840 * MRC pNUM, op1, rX, CRn, CRm, op2 ; read CP into rX
841 * The "rX" is necessarily omitted; it uses Tcl mechanisms.
842 */
843 retval = Jim_GetLong(interp, argv[1], &l);
844 if (retval != JIM_OK)
845 return retval;
846 if (l & ~0xf) {
847 LOG_ERROR("%s: %s %d out of range", __func__,
848 "coprocessor", (int) l);
849 return JIM_ERR;
850 }
851 cpnum = l;
852
853 retval = Jim_GetLong(interp, argv[2], &l);
854 if (retval != JIM_OK)
855 return retval;
856 if (l & ~0x7) {
857 LOG_ERROR("%s: %s %d out of range", __func__,
858 "op1", (int) l);
859 return JIM_ERR;
860 }
861 op1 = l;
862
863 retval = Jim_GetLong(interp, argv[3], &l);
864 if (retval != JIM_OK)
865 return retval;
866 if (l & ~0xf) {
867 LOG_ERROR("%s: %s %d out of range", __func__,
868 "CRn", (int) l);
869 return JIM_ERR;
870 }
871 CRn = l;
872
873 retval = Jim_GetLong(interp, argv[4], &l);
874 if (retval != JIM_OK)
875 return retval;
876 if (l & ~0xf) {
877 LOG_ERROR("%s: %s %d out of range", __func__,
878 "CRm", (int) l);
879 return JIM_ERR;
880 }
881 CRm = l;
882
883 retval = Jim_GetLong(interp, argv[5], &l);
884 if (retval != JIM_OK)
885 return retval;
886 if (l & ~0x7) {
887 LOG_ERROR("%s: %s %d out of range", __func__,
888 "op2", (int) l);
889 return JIM_ERR;
890 }
891 op2 = l;
892
893 value = 0;
894
895 /* FIXME don't assume "mrc" vs "mcr" from the number of params;
896 * that could easily be a typo! Check both...
897 *
898 * FIXME change the call syntax here ... simplest to just pass
899 * the MRC() or MCR() instruction to be executed. That will also
900 * let us support the "mrc2" and "mcr2" opcodes (toggling one bit)
901 * if that's ever needed.
902 */
903 if (argc == 7) {
904 retval = Jim_GetLong(interp, argv[6], &l);
905 if (retval != JIM_OK) {
906 return retval;
907 }
908 value = l;
909
910 /* NOTE: parameters reordered! */
911 // ARMV4_5_MCR(cpnum, op1, 0, CRn, CRm, op2)
912 retval = arm->mcr(target, cpnum, op1, op2, CRn, CRm, value);
913 if (retval != ERROR_OK)
914 return JIM_ERR;
915 } else {
916 /* NOTE: parameters reordered! */
917 // ARMV4_5_MRC(cpnum, op1, 0, CRn, CRm, op2)
918 retval = arm->mrc(target, cpnum, op1, op2, CRn, CRm, &value);
919 if (retval != ERROR_OK)
920 return JIM_ERR;
921
922 Jim_SetResult(interp, Jim_NewIntObj(interp, value));
923 }
924
925 return JIM_OK;
926 }
927
928 static const struct command_registration arm_exec_command_handlers[] = {
929 {
930 .name = "reg",
931 .handler = handle_armv4_5_reg_command,
932 .mode = COMMAND_EXEC,
933 .help = "display ARM core registers",
934 },
935 {
936 .name = "core_state",
937 .handler = handle_armv4_5_core_state_command,
938 .mode = COMMAND_EXEC,
939 .usage = "['arm'|'thumb']",
940 .help = "display/change ARM core state",
941 },
942 {
943 .name = "disassemble",
944 .handler = handle_armv4_5_disassemble_command,
945 .mode = COMMAND_EXEC,
946 .usage = "address [count ['thumb']]",
947 .help = "disassemble instructions ",
948 },
949 {
950 .name = "mcr",
951 .mode = COMMAND_EXEC,
952 .jim_handler = &jim_mcrmrc,
953 .help = "write coprocessor register",
954 .usage = "cpnum op1 CRn op2 CRm value",
955 },
956 {
957 .name = "mrc",
958 .jim_handler = &jim_mcrmrc,
959 .help = "read coprocessor register",
960 .usage = "cpnum op1 CRn op2 CRm",
961 },
962
963 COMMAND_REGISTRATION_DONE
964 };
965 const struct command_registration arm_command_handlers[] = {
966 {
967 .name = "arm",
968 .mode = COMMAND_ANY,
969 .help = "ARM command group",
970 .chain = arm_exec_command_handlers,
971 },
972 COMMAND_REGISTRATION_DONE
973 };
974
975 int arm_get_gdb_reg_list(struct target *target,
976 struct reg **reg_list[], int *reg_list_size)
977 {
978 struct arm *armv4_5 = target_to_arm(target);
979 int i;
980
981 if (!is_arm_mode(armv4_5->core_mode))
982 return ERROR_FAIL;
983
984 *reg_list_size = 26;
985 *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
986
987 for (i = 0; i < 16; i++)
988 (*reg_list)[i] = arm_reg_current(armv4_5, i);
989
990 for (i = 16; i < 24; i++)
991 (*reg_list)[i] = &arm_gdb_dummy_fp_reg;
992
993 (*reg_list)[24] = &arm_gdb_dummy_fps_reg;
994 (*reg_list)[25] = armv4_5->cpsr;
995
996 return ERROR_OK;
997 }
998
999 /* wait for execution to complete and check exit point */
1000 static int armv4_5_run_algorithm_completion(struct target *target, uint32_t exit_point, int timeout_ms, void *arch_info)
1001 {
1002 int retval;
1003 struct arm *armv4_5 = target_to_arm(target);
1004
1005 if ((retval = target_wait_state(target, TARGET_HALTED, timeout_ms)) != ERROR_OK)
1006 {
1007 return retval;
1008 }
1009 if (target->state != TARGET_HALTED)
1010 {
1011 if ((retval = target_halt(target)) != ERROR_OK)
1012 return retval;
1013 if ((retval = target_wait_state(target, TARGET_HALTED, 500)) != ERROR_OK)
1014 {
1015 return retval;
1016 }
1017 return ERROR_TARGET_TIMEOUT;
1018 }
1019
1020 /* fast exit: ARMv5+ code can use BKPT */
1021 if (exit_point && buf_get_u32(armv4_5->pc->value, 0, 32) != exit_point)
1022 {
1023 LOG_WARNING("target reentered debug state, but not at the desired exit point: 0x%4.4" PRIx32 "",
1024 buf_get_u32(armv4_5->pc->value, 0, 32));
1025 return ERROR_TARGET_TIMEOUT;
1026 }
1027
1028 return ERROR_OK;
1029 }
1030
1031 int armv4_5_run_algorithm_inner(struct target *target,
1032 int num_mem_params, struct mem_param *mem_params,
1033 int num_reg_params, struct reg_param *reg_params,
1034 uint32_t entry_point, uint32_t exit_point,
1035 int timeout_ms, void *arch_info,
1036 int (*run_it)(struct target *target, uint32_t exit_point,
1037 int timeout_ms, void *arch_info))
1038 {
1039 struct arm *armv4_5 = target_to_arm(target);
1040 struct arm_algorithm *arm_algorithm_info = arch_info;
1041 enum arm_state core_state = armv4_5->core_state;
1042 uint32_t context[17];
1043 uint32_t cpsr;
1044 int exit_breakpoint_size = 0;
1045 int i;
1046 int retval = ERROR_OK;
1047
1048 LOG_DEBUG("Running algorithm");
1049
1050 if (arm_algorithm_info->common_magic != ARM_COMMON_MAGIC)
1051 {
1052 LOG_ERROR("current target isn't an ARMV4/5 target");
1053 return ERROR_TARGET_INVALID;
1054 }
1055
1056 if (target->state != TARGET_HALTED)
1057 {
1058 LOG_WARNING("target not halted");
1059 return ERROR_TARGET_NOT_HALTED;
1060 }
1061
1062 if (!is_arm_mode(armv4_5->core_mode))
1063 return ERROR_FAIL;
1064
1065 /* armv5 and later can terminate with BKPT instruction; less overhead */
1066 if (!exit_point && armv4_5->is_armv4)
1067 {
1068 LOG_ERROR("ARMv4 target needs HW breakpoint location");
1069 return ERROR_FAIL;
1070 }
1071
1072 /* save r0..pc, cpsr-or-spsr, and then cpsr-for-sure;
1073 * they'll be restored later.
1074 */
1075 for (i = 0; i <= 16; i++)
1076 {
1077 struct reg *r;
1078
1079 r = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
1080 arm_algorithm_info->core_mode, i);
1081 if (!r->valid)
1082 armv4_5->read_core_reg(target, r, i,
1083 arm_algorithm_info->core_mode);
1084 context[i] = buf_get_u32(r->value, 0, 32);
1085 }
1086 cpsr = buf_get_u32(armv4_5->cpsr->value, 0, 32);
1087
1088 for (i = 0; i < num_mem_params; i++)
1089 {
1090 if ((retval = target_write_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
1091 {
1092 return retval;
1093 }
1094 }
1095
1096 for (i = 0; i < num_reg_params; i++)
1097 {
1098 struct reg *reg = register_get_by_name(armv4_5->core_cache, reg_params[i].reg_name, 0);
1099 if (!reg)
1100 {
1101 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
1102 return ERROR_INVALID_ARGUMENTS;
1103 }
1104
1105 if (reg->size != reg_params[i].size)
1106 {
1107 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
1108 return ERROR_INVALID_ARGUMENTS;
1109 }
1110
1111 if ((retval = armv4_5_set_core_reg(reg, reg_params[i].value)) != ERROR_OK)
1112 {
1113 return retval;
1114 }
1115 }
1116
1117 armv4_5->core_state = arm_algorithm_info->core_state;
1118 if (armv4_5->core_state == ARM_STATE_ARM)
1119 exit_breakpoint_size = 4;
1120 else if (armv4_5->core_state == ARM_STATE_THUMB)
1121 exit_breakpoint_size = 2;
1122 else
1123 {
1124 LOG_ERROR("BUG: can't execute algorithms when not in ARM or Thumb state");
1125 return ERROR_INVALID_ARGUMENTS;
1126 }
1127
1128 if (arm_algorithm_info->core_mode != ARM_MODE_ANY)
1129 {
1130 LOG_DEBUG("setting core_mode: 0x%2.2x",
1131 arm_algorithm_info->core_mode);
1132 buf_set_u32(armv4_5->cpsr->value, 0, 5,
1133 arm_algorithm_info->core_mode);
1134 armv4_5->cpsr->dirty = 1;
1135 armv4_5->cpsr->valid = 1;
1136 }
1137
1138 /* terminate using a hardware or (ARMv5+) software breakpoint */
1139 if (exit_point && (retval = breakpoint_add(target, exit_point,
1140 exit_breakpoint_size, BKPT_HARD)) != ERROR_OK)
1141 {
1142 LOG_ERROR("can't add HW breakpoint to terminate algorithm");
1143 return ERROR_TARGET_FAILURE;
1144 }
1145
1146 if ((retval = target_resume(target, 0, entry_point, 1, 1)) != ERROR_OK)
1147 {
1148 return retval;
1149 }
1150 int retvaltemp;
1151 retval = run_it(target, exit_point, timeout_ms, arch_info);
1152
1153 if (exit_point)
1154 breakpoint_remove(target, exit_point);
1155
1156 if (retval != ERROR_OK)
1157 return retval;
1158
1159 for (i = 0; i < num_mem_params; i++)
1160 {
1161 if (mem_params[i].direction != PARAM_OUT)
1162 if ((retvaltemp = target_read_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
1163 {
1164 retval = retvaltemp;
1165 }
1166 }
1167
1168 for (i = 0; i < num_reg_params; i++)
1169 {
1170 if (reg_params[i].direction != PARAM_OUT)
1171 {
1172
1173 struct reg *reg = register_get_by_name(armv4_5->core_cache, reg_params[i].reg_name, 0);
1174 if (!reg)
1175 {
1176 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
1177 retval = ERROR_INVALID_ARGUMENTS;
1178 continue;
1179 }
1180
1181 if (reg->size != reg_params[i].size)
1182 {
1183 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
1184 retval = ERROR_INVALID_ARGUMENTS;
1185 continue;
1186 }
1187
1188 buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
1189 }
1190 }
1191
1192 /* restore everything we saved before (17 or 18 registers) */
1193 for (i = 0; i <= 16; i++)
1194 {
1195 uint32_t regvalue;
1196 regvalue = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, arm_algorithm_info->core_mode, i).value, 0, 32);
1197 if (regvalue != context[i])
1198 {
1199 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32 "", ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, arm_algorithm_info->core_mode, i).name, context[i]);
1200 buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, arm_algorithm_info->core_mode, i).value, 0, 32, context[i]);
1201 ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, arm_algorithm_info->core_mode, i).valid = 1;
1202 ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, arm_algorithm_info->core_mode, i).dirty = 1;
1203 }
1204 }
1205
1206 arm_set_cpsr(armv4_5, cpsr);
1207 armv4_5->cpsr->dirty = 1;
1208
1209 armv4_5->core_state = core_state;
1210
1211 return retval;
1212 }
1213
1214 int armv4_5_run_algorithm(struct target *target, int num_mem_params, struct mem_param *mem_params, int num_reg_params, struct reg_param *reg_params, uint32_t entry_point, uint32_t exit_point, int timeout_ms, void *arch_info)
1215 {
1216 return armv4_5_run_algorithm_inner(target, num_mem_params, mem_params, num_reg_params, reg_params, entry_point, exit_point, timeout_ms, arch_info, armv4_5_run_algorithm_completion);
1217 }
1218
1219 /**
1220 * Runs ARM code in the target to calculate a CRC32 checksum.
1221 *
1222 * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
1223 */
1224 int arm_checksum_memory(struct target *target,
1225 uint32_t address, uint32_t count, uint32_t *checksum)
1226 {
1227 struct working_area *crc_algorithm;
1228 struct arm_algorithm armv4_5_info;
1229 struct reg_param reg_params[2];
1230 int retval;
1231 uint32_t i;
1232
1233 static const uint32_t arm_crc_code[] = {
1234 0xE1A02000, /* mov r2, r0 */
1235 0xE3E00000, /* mov r0, #0xffffffff */
1236 0xE1A03001, /* mov r3, r1 */
1237 0xE3A04000, /* mov r4, #0 */
1238 0xEA00000B, /* b ncomp */
1239 /* nbyte: */
1240 0xE7D21004, /* ldrb r1, [r2, r4] */
1241 0xE59F7030, /* ldr r7, CRC32XOR */
1242 0xE0200C01, /* eor r0, r0, r1, asl 24 */
1243 0xE3A05000, /* mov r5, #0 */
1244 /* loop: */
1245 0xE3500000, /* cmp r0, #0 */
1246 0xE1A06080, /* mov r6, r0, asl #1 */
1247 0xE2855001, /* add r5, r5, #1 */
1248 0xE1A00006, /* mov r0, r6 */
1249 0xB0260007, /* eorlt r0, r6, r7 */
1250 0xE3550008, /* cmp r5, #8 */
1251 0x1AFFFFF8, /* bne loop */
1252 0xE2844001, /* add r4, r4, #1 */
1253 /* ncomp: */
1254 0xE1540003, /* cmp r4, r3 */
1255 0x1AFFFFF1, /* bne nbyte */
1256 /* end: */
1257 0xEAFFFFFE, /* b end */
1258 /* CRC32XOR: */
1259 0x04C11DB7 /* .word 0x04C11DB7 */
1260 };
1261
1262 retval = target_alloc_working_area(target,
1263 sizeof(arm_crc_code), &crc_algorithm);
1264 if (retval != ERROR_OK)
1265 return retval;
1266
1267 /* convert code into a buffer in target endianness */
1268 for (i = 0; i < ARRAY_SIZE(arm_crc_code); i++) {
1269 retval = target_write_u32(target,
1270 crc_algorithm->address + i * sizeof(uint32_t),
1271 arm_crc_code[i]);
1272 if (retval != ERROR_OK)
1273 return retval;
1274 }
1275
1276 armv4_5_info.common_magic = ARM_COMMON_MAGIC;
1277 armv4_5_info.core_mode = ARM_MODE_SVC;
1278 armv4_5_info.core_state = ARM_STATE_ARM;
1279
1280 init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
1281 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
1282
1283 buf_set_u32(reg_params[0].value, 0, 32, address);
1284 buf_set_u32(reg_params[1].value, 0, 32, count);
1285
1286 /* 20 second timeout/megabyte */
1287 int timeout = 20000 * (1 + (count / (1024 * 1024)));
1288
1289 retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
1290 crc_algorithm->address,
1291 crc_algorithm->address + sizeof(arm_crc_code) - 8,
1292 timeout, &armv4_5_info);
1293 if (retval != ERROR_OK) {
1294 LOG_ERROR("error executing ARM crc algorithm");
1295 destroy_reg_param(&reg_params[0]);
1296 destroy_reg_param(&reg_params[1]);
1297 target_free_working_area(target, crc_algorithm);
1298 return retval;
1299 }
1300
1301 *checksum = buf_get_u32(reg_params[0].value, 0, 32);
1302
1303 destroy_reg_param(&reg_params[0]);
1304 destroy_reg_param(&reg_params[1]);
1305
1306 target_free_working_area(target, crc_algorithm);
1307
1308 return ERROR_OK;
1309 }
1310
1311 /**
1312 * Runs ARM code in the target to check whether a memory block holds
1313 * all ones. NOR flash which has been erased, and thus may be written,
1314 * holds all ones.
1315 *
1316 * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
1317 */
1318 int arm_blank_check_memory(struct target *target,
1319 uint32_t address, uint32_t count, uint32_t *blank)
1320 {
1321 struct working_area *check_algorithm;
1322 struct reg_param reg_params[3];
1323 struct arm_algorithm armv4_5_info;
1324 int retval;
1325 uint32_t i;
1326
1327 static const uint32_t check_code[] = {
1328 /* loop: */
1329 0xe4d03001, /* ldrb r3, [r0], #1 */
1330 0xe0022003, /* and r2, r2, r3 */
1331 0xe2511001, /* subs r1, r1, #1 */
1332 0x1afffffb, /* bne loop */
1333 /* end: */
1334 0xeafffffe /* b end */
1335 };
1336
1337 /* make sure we have a working area */
1338 retval = target_alloc_working_area(target,
1339 sizeof(check_code), &check_algorithm);
1340 if (retval != ERROR_OK)
1341 return retval;
1342
1343 /* convert code into a buffer in target endianness */
1344 for (i = 0; i < ARRAY_SIZE(check_code); i++) {
1345 retval = target_write_u32(target,
1346 check_algorithm->address
1347 + i * sizeof(uint32_t),
1348 check_code[i]);
1349 if (retval != ERROR_OK)
1350 return retval;
1351 }
1352
1353 armv4_5_info.common_magic = ARM_COMMON_MAGIC;
1354 armv4_5_info.core_mode = ARM_MODE_SVC;
1355 armv4_5_info.core_state = ARM_STATE_ARM;
1356
1357 init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
1358 buf_set_u32(reg_params[0].value, 0, 32, address);
1359
1360 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
1361 buf_set_u32(reg_params[1].value, 0, 32, count);
1362
1363 init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
1364 buf_set_u32(reg_params[2].value, 0, 32, 0xff);
1365
1366 retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
1367 check_algorithm->address,
1368 check_algorithm->address + sizeof(check_code) - 4,
1369 10000, &armv4_5_info);
1370 if (retval != ERROR_OK) {
1371 destroy_reg_param(&reg_params[0]);
1372 destroy_reg_param(&reg_params[1]);
1373 destroy_reg_param(&reg_params[2]);
1374 target_free_working_area(target, check_algorithm);
1375 return retval;
1376 }
1377
1378 *blank = buf_get_u32(reg_params[2].value, 0, 32);
1379
1380 destroy_reg_param(&reg_params[0]);
1381 destroy_reg_param(&reg_params[1]);
1382 destroy_reg_param(&reg_params[2]);
1383
1384 target_free_working_area(target, check_algorithm);
1385
1386 return ERROR_OK;
1387 }
1388
1389 static int arm_full_context(struct target *target)
1390 {
1391 struct arm *armv4_5 = target_to_arm(target);
1392 unsigned num_regs = armv4_5->core_cache->num_regs;
1393 struct reg *reg = armv4_5->core_cache->reg_list;
1394 int retval = ERROR_OK;
1395
1396 for (; num_regs && retval == ERROR_OK; num_regs--, reg++) {
1397 if (reg->valid)
1398 continue;
1399 retval = armv4_5_get_core_reg(reg);
1400 }
1401 return retval;
1402 }
1403
1404 static int arm_default_mrc(struct target *target, int cpnum,
1405 uint32_t op1, uint32_t op2,
1406 uint32_t CRn, uint32_t CRm,
1407 uint32_t *value)
1408 {
1409 LOG_ERROR("%s doesn't implement MRC", target_type_name(target));
1410 return ERROR_FAIL;
1411 }
1412
1413 static int arm_default_mcr(struct target *target, int cpnum,
1414 uint32_t op1, uint32_t op2,
1415 uint32_t CRn, uint32_t CRm,
1416 uint32_t value)
1417 {
1418 LOG_ERROR("%s doesn't implement MCR", target_type_name(target));
1419 return ERROR_FAIL;
1420 }
1421
1422 int arm_init_arch_info(struct target *target, struct arm *armv4_5)
1423 {
1424 target->arch_info = armv4_5;
1425 armv4_5->target = target;
1426
1427 armv4_5->common_magic = ARM_COMMON_MAGIC;
1428
1429 /* core_type may be overridden by subtype logic */
1430 if (armv4_5->core_type != ARM_MODE_THREAD) {
1431 armv4_5->core_type = ARM_MODE_ANY;
1432 arm_set_cpsr(armv4_5, ARM_MODE_USR);
1433 }
1434
1435 /* default full_context() has no core-specific optimizations */
1436 if (!armv4_5->full_context && armv4_5->read_core_reg)
1437 armv4_5->full_context = arm_full_context;
1438
1439 if (!armv4_5->mrc)
1440 armv4_5->mrc = arm_default_mrc;
1441 if (!armv4_5->mcr)
1442 armv4_5->mcr = arm_default_mcr;
1443
1444 return ERROR_OK;
1445 }
Some of Dave's pending patches