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ARMv4/ARMv5: no exit() calls
[openocd/ztw.git] / src / target / armv4_5.c
blob717c8265bf3a89bf09728d295363f68cac3b3a0e
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 "armv4_5.h"
31 #include "arm_jtag.h"
32 #include "breakpoints.h"
33 #include "arm_disassembler.h"
34 #include "binarybuffer.h"
35 #include "algorithm.h"
36 #include "register.h"
37
38
39 char* armv4_5_core_reg_list[] =
40 {
41 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13_usr", "lr_usr", "pc",
42
43 "r8_fiq", "r9_fiq", "r10_fiq", "r11_fiq", "r12_fiq", "r13_fiq", "lr_fiq",
44
45 "r13_irq", "lr_irq",
46
47 "r13_svc", "lr_svc",
48
49 "r13_abt", "lr_abt",
50
51 "r13_und", "lr_und",
52
53 "cpsr", "spsr_fiq", "spsr_irq", "spsr_svc", "spsr_abt", "spsr_und"
54 };
55
56 static const char *armv4_5_mode_strings_list[] =
57 {
58 "Illegal mode value", "User", "FIQ", "IRQ", "Supervisor", "Abort", "Undefined", "System"
59 };
60
61 /* Hack! Yuk! allow -1 index, which simplifies codepaths elsewhere in the code */
62 const char **armv4_5_mode_strings = armv4_5_mode_strings_list + 1;
63
64 /** Map PSR mode bits to linear number */
65 int armv4_5_mode_to_number(enum armv4_5_mode mode)
66 {
67 switch (mode) {
68 case ARMV4_5_MODE_ANY:
69 /* map MODE_ANY to user mode */
70 case ARMV4_5_MODE_USR:
71 return 0;
72 case ARMV4_5_MODE_FIQ:
73 return 1;
74 case ARMV4_5_MODE_IRQ:
75 return 2;
76 case ARMV4_5_MODE_SVC:
77 return 3;
78 case ARMV4_5_MODE_ABT:
79 return 4;
80 case ARMV4_5_MODE_UND:
81 return 5;
82 case ARMV4_5_MODE_SYS:
83 return 6;
84 default:
85 LOG_ERROR("invalid mode value encountered %d", mode);
86 return -1;
87 }
88 }
89
90 /** Map linear number to PSR mode bits. */
91 enum armv4_5_mode armv4_5_number_to_mode(int number)
92 {
93 switch (number) {
94 case 0:
95 return ARMV4_5_MODE_USR;
96 case 1:
97 return ARMV4_5_MODE_FIQ;
98 case 2:
99 return ARMV4_5_MODE_IRQ;
100 case 3:
101 return ARMV4_5_MODE_SVC;
102 case 4:
103 return ARMV4_5_MODE_ABT;
104 case 5:
105 return ARMV4_5_MODE_UND;
106 case 6:
107 return ARMV4_5_MODE_SYS;
108 default:
109 LOG_ERROR("mode index out of bounds %d", number);
110 return ARMV4_5_MODE_ANY;
111 }
112 }
113
114 char* armv4_5_state_strings[] =
115 {
116 "ARM", "Thumb", "Jazelle"
117 };
118
119 int armv4_5_core_reg_arch_type = -1;
120
121 struct armv4_5_core_reg armv4_5_core_reg_list_arch_info[] =
122 {
123 {0, ARMV4_5_MODE_ANY, NULL, NULL},
124 {1, ARMV4_5_MODE_ANY, NULL, NULL},
125 {2, ARMV4_5_MODE_ANY, NULL, NULL},
126 {3, ARMV4_5_MODE_ANY, NULL, NULL},
127 {4, ARMV4_5_MODE_ANY, NULL, NULL},
128 {5, ARMV4_5_MODE_ANY, NULL, NULL},
129 {6, ARMV4_5_MODE_ANY, NULL, NULL},
130 {7, ARMV4_5_MODE_ANY, NULL, NULL},
131 {8, ARMV4_5_MODE_ANY, NULL, NULL},
132 {9, ARMV4_5_MODE_ANY, NULL, NULL},
133 {10, ARMV4_5_MODE_ANY, NULL, NULL},
134 {11, ARMV4_5_MODE_ANY, NULL, NULL},
135 {12, ARMV4_5_MODE_ANY, NULL, NULL},
136 {13, ARMV4_5_MODE_USR, NULL, NULL},
137 {14, ARMV4_5_MODE_USR, NULL, NULL},
138 {15, ARMV4_5_MODE_ANY, NULL, NULL},
139
140 {8, ARMV4_5_MODE_FIQ, NULL, NULL},
141 {9, ARMV4_5_MODE_FIQ, NULL, NULL},
142 {10, ARMV4_5_MODE_FIQ, NULL, NULL},
143 {11, ARMV4_5_MODE_FIQ, NULL, NULL},
144 {12, ARMV4_5_MODE_FIQ, NULL, NULL},
145 {13, ARMV4_5_MODE_FIQ, NULL, NULL},
146 {14, ARMV4_5_MODE_FIQ, NULL, NULL},
147
148 {13, ARMV4_5_MODE_IRQ, NULL, NULL},
149 {14, ARMV4_5_MODE_IRQ, NULL, NULL},
150
151 {13, ARMV4_5_MODE_SVC, NULL, NULL},
152 {14, ARMV4_5_MODE_SVC, NULL, NULL},
153
154 {13, ARMV4_5_MODE_ABT, NULL, NULL},
155 {14, ARMV4_5_MODE_ABT, NULL, NULL},
156
157 {13, ARMV4_5_MODE_UND, NULL, NULL},
158 {14, ARMV4_5_MODE_UND, NULL, NULL},
159
160 {16, ARMV4_5_MODE_ANY, NULL, NULL},
161 {16, ARMV4_5_MODE_FIQ, NULL, NULL},
162 {16, ARMV4_5_MODE_IRQ, NULL, NULL},
163 {16, ARMV4_5_MODE_SVC, NULL, NULL},
164 {16, ARMV4_5_MODE_ABT, NULL, NULL},
165 {16, ARMV4_5_MODE_UND, NULL, NULL}
166 };
167
168 /* map core mode (USR, FIQ, ...) and register number to indizes into the register cache */
169 int armv4_5_core_reg_map[7][17] =
170 {
171 { /* USR */
172 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
173 },
174 { /* FIQ */
175 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 15, 32
176 },
177 { /* IRQ */
178 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24, 15, 33
179 },
180 { /* SVC */
181 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26, 15, 34
182 },
183 { /* ABT */
184 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27, 28, 15, 35
185 },
186 { /* UND */
187 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29, 30, 15, 36
188 },
189 { /* SYS */
190 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
191 }
192 };
193
194 uint8_t armv4_5_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
195
196 struct reg armv4_5_gdb_dummy_fp_reg =
197 {
198 .name = "GDB dummy floating-point register",
199 .value = armv4_5_gdb_dummy_fp_value,
200 .dirty = 0,
201 .valid = 1,
202 .size = 96,
203 .arch_info = NULL,
204 .arch_type = 0,
205 };
206
207 uint8_t armv4_5_gdb_dummy_fps_value[] = {0, 0, 0, 0};
208
209 struct reg armv4_5_gdb_dummy_fps_reg =
210 {
211 .name = "GDB dummy floating-point status register",
212 .value = armv4_5_gdb_dummy_fps_value,
213 .dirty = 0,
214 .valid = 1,
215 .size = 32,
216 .arch_info = NULL,
217 .arch_type = 0,
218 };
219
220 int armv4_5_get_core_reg(struct reg *reg)
221 {
222 int retval;
223 struct armv4_5_core_reg *armv4_5 = reg->arch_info;
224 struct target *target = armv4_5->target;
225
226 if (target->state != TARGET_HALTED)
227 {
228 LOG_ERROR("Target not halted");
229 return ERROR_TARGET_NOT_HALTED;
230 }
231
232 /* retval = armv4_5->armv4_5_common->full_context(target); */
233 retval = armv4_5->armv4_5_common->read_core_reg(target, armv4_5->num, armv4_5->mode);
234
235 return retval;
236 }
237
238 int armv4_5_set_core_reg(struct reg *reg, uint8_t *buf)
239 {
240 struct armv4_5_core_reg *armv4_5 = reg->arch_info;
241 struct target *target = armv4_5->target;
242 struct armv4_5_common_s *armv4_5_target = target_to_armv4_5(target);
243 uint32_t value = buf_get_u32(buf, 0, 32);
244
245 if (target->state != TARGET_HALTED)
246 {
247 return ERROR_TARGET_NOT_HALTED;
248 }
249
250 if (reg == &armv4_5_target->core_cache->reg_list[ARMV4_5_CPSR])
251 {
252 if (value & 0x20)
253 {
254 /* T bit should be set */
255 if (armv4_5_target->core_state == ARMV4_5_STATE_ARM)
256 {
257 /* change state to Thumb */
258 LOG_DEBUG("changing to Thumb state");
259 armv4_5_target->core_state = ARMV4_5_STATE_THUMB;
260 }
261 }
262 else
263 {
264 /* T bit should be cleared */
265 if (armv4_5_target->core_state == ARMV4_5_STATE_THUMB)
266 {
267 /* change state to ARM */
268 LOG_DEBUG("changing to ARM state");
269 armv4_5_target->core_state = ARMV4_5_STATE_ARM;
270 }
271 }
272
273 if (armv4_5_target->core_mode != (enum armv4_5_mode)(value & 0x1f))
274 {
275 LOG_DEBUG("changing ARM core mode to '%s'", armv4_5_mode_strings[armv4_5_mode_to_number(value & 0x1f)]);
276 armv4_5_target->core_mode = value & 0x1f;
277 armv4_5_target->write_core_reg(target, 16, ARMV4_5_MODE_ANY, value);
278 }
279 }
280
281 buf_set_u32(reg->value, 0, 32, value);
282 reg->dirty = 1;
283 reg->valid = 1;
284
285 return ERROR_OK;
286 }
287
288 int armv4_5_invalidate_core_regs(struct target *target)
289 {
290 struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
291 int i;
292
293 for (i = 0; i < 37; i++)
294 {
295 armv4_5->core_cache->reg_list[i].valid = 0;
296 armv4_5->core_cache->reg_list[i].dirty = 0;
297 }
298
299 return ERROR_OK;
300 }
301
302 struct reg_cache* armv4_5_build_reg_cache(struct target *target, struct arm *armv4_5_common)
303 {
304 int num_regs = 37;
305 struct reg_cache *cache = malloc(sizeof(struct reg_cache));
306 struct reg *reg_list = malloc(sizeof(struct reg) * num_regs);
307 struct armv4_5_core_reg *arch_info = malloc(sizeof(struct armv4_5_core_reg) * num_regs);
308 int i;
309
310 cache->name = "arm v4/5 registers";
311 cache->next = NULL;
312 cache->reg_list = reg_list;
313 cache->num_regs = num_regs;
314
315 if (armv4_5_core_reg_arch_type == -1)
316 armv4_5_core_reg_arch_type = register_reg_arch_type(armv4_5_get_core_reg, armv4_5_set_core_reg);
317
318 register_init_dummy(&armv4_5_gdb_dummy_fp_reg);
319 register_init_dummy(&armv4_5_gdb_dummy_fps_reg);
320
321 for (i = 0; i < 37; i++)
322 {
323 arch_info[i] = armv4_5_core_reg_list_arch_info[i];
324 arch_info[i].target = target;
325 arch_info[i].armv4_5_common = armv4_5_common;
326 reg_list[i].name = armv4_5_core_reg_list[i];
327 reg_list[i].size = 32;
328 reg_list[i].value = calloc(1, 4);
329 reg_list[i].dirty = 0;
330 reg_list[i].valid = 0;
331 reg_list[i].arch_type = armv4_5_core_reg_arch_type;
332 reg_list[i].arch_info = &arch_info[i];
333 }
334
335 return cache;
336 }
337
338 int armv4_5_arch_state(struct target *target)
339 {
340 struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
341
342 if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
343 {
344 LOG_ERROR("BUG: called for a non-ARMv4/5 target");
345 return ERROR_FAIL;
346 }
347
348 LOG_USER("target halted in %s state due to %s, current mode: %s\ncpsr: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "",
349 armv4_5_state_strings[armv4_5->core_state],
350 Jim_Nvp_value2name_simple(nvp_target_debug_reason, target->debug_reason)->name,
351 armv4_5_mode_strings[armv4_5_mode_to_number(armv4_5->core_mode)],
352 buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32),
353 buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
354
355 return ERROR_OK;
356 }
357
358 COMMAND_HANDLER(handle_armv4_5_reg_command)
359 {
360 char output[128];
361 int output_len;
362 int mode, num;
363 struct target *target = get_current_target(cmd_ctx);
364 struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
365
366 if (!is_arm(armv4_5))
367 {
368 command_print(cmd_ctx, "current target isn't an ARM");
369 return ERROR_FAIL;
370 }
371
372 if (target->state != TARGET_HALTED)
373 {
374 command_print(cmd_ctx, "error: target must be halted for register accesses");
375 return ERROR_OK;
376 }
377
378 if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
379 return ERROR_FAIL;
380
381 if (!armv4_5->full_context) {
382 command_print(cmd_ctx, "error: target doesn't support %s",
383 CMD_NAME);
384 return ERROR_FAIL;
385 }
386
387 for (num = 0; num <= 15; num++)
388 {
389 output_len = 0;
390 for (mode = 0; mode < 6; mode++)
391 {
392 if (!ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).valid)
393 {
394 armv4_5->full_context(target);
395 }
396 output_len += snprintf(output + output_len,
397 128 - output_len,
398 "%8s: %8.8" PRIx32 " ",
399 ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).name,
400 buf_get_u32(ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).value, 0, 32));
401 }
402 command_print(cmd_ctx, "%s", output);
403 }
404 command_print(cmd_ctx,
405 " cpsr: %8.8" PRIx32 " spsr_fiq: %8.8" PRIx32 " spsr_irq: %8.8" PRIx32 " spsr_svc: %8.8" PRIx32 " spsr_abt: %8.8" PRIx32 " spsr_und: %8.8" PRIx32 "",
406 buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32),
407 buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_FIQ].value, 0, 32),
408 buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_IRQ].value, 0, 32),
409 buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_SVC].value, 0, 32),
410 buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_ABT].value, 0, 32),
411 buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_UND].value, 0, 32));
412
413 return ERROR_OK;
414 }
415
416 COMMAND_HANDLER(handle_armv4_5_core_state_command)
417 {
418 struct target *target = get_current_target(cmd_ctx);
419 struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
420
421 if (!is_arm(armv4_5))
422 {
423 command_print(cmd_ctx, "current target isn't an ARM");
424 return ERROR_FAIL;
425 }
426
427 if (argc > 0)
428 {
429 if (strcmp(args[0], "arm") == 0)
430 {
431 armv4_5->core_state = ARMV4_5_STATE_ARM;
432 }
433 if (strcmp(args[0], "thumb") == 0)
434 {
435 armv4_5->core_state = ARMV4_5_STATE_THUMB;
436 }
437 }
438
439 command_print(cmd_ctx, "core state: %s", armv4_5_state_strings[armv4_5->core_state]);
440
441 return ERROR_OK;
442 }
443
444 COMMAND_HANDLER(handle_armv4_5_disassemble_command)
445 {
446 int retval = ERROR_OK;
447 struct target *target = get_current_target(cmd_ctx);
448 struct arm *arm = target ? target_to_arm(target) : NULL;
449 uint32_t address;
450 int count = 1;
451 int thumb = 0;
452
453 if (!is_arm(arm)) {
454 command_print(cmd_ctx, "current target isn't an ARM");
455 return ERROR_FAIL;
456 }
457
458 switch (argc) {
459 case 3:
460 if (strcmp(args[2], "thumb") != 0)
461 goto usage;
462 thumb = 1;
463 /* FALL THROUGH */
464 case 2:
465 COMMAND_PARSE_NUMBER(int, args[1], count);
466 /* FALL THROUGH */
467 case 1:
468 COMMAND_PARSE_NUMBER(u32, args[0], address);
469 if (address & 0x01) {
470 if (!thumb) {
471 command_print(cmd_ctx, "Disassemble as Thumb");
472 thumb = 1;
473 }
474 address &= ~1;
475 }
476 break;
477 default:
478 usage:
479 command_print(cmd_ctx,
480 "usage: arm disassemble <address> [<count> ['thumb']]");
481 count = 0;
482 retval = ERROR_FAIL;
483 }
484
485 while (count-- > 0) {
486 struct arm_instruction cur_instruction;
487
488 if (thumb) {
489 /* Always use Thumb2 disassembly for best handling
490 * of 32-bit BL/BLX, and to work with newer cores
491 * (some ARMv6, all ARMv7) that use Thumb2.
492 */
493 retval = thumb2_opcode(target, address,
494 &cur_instruction);
495 if (retval != ERROR_OK)
496 break;
497 } else {
498 uint32_t opcode;
499
500 retval = target_read_u32(target, address, &opcode);
501 if (retval != ERROR_OK)
502 break;
503 retval = arm_evaluate_opcode(opcode, address,
504 &cur_instruction) != ERROR_OK;
505 if (retval != ERROR_OK)
506 break;
507 }
508 command_print(cmd_ctx, "%s", cur_instruction.text);
509 address += cur_instruction.instruction_size;
510 }
511
512 return retval;
513 }
514
515 int armv4_5_register_commands(struct command_context *cmd_ctx)
516 {
517 struct command *armv4_5_cmd;
518
519 armv4_5_cmd = register_command(cmd_ctx, NULL, "arm",
520 NULL, COMMAND_ANY,
521 "generic ARM commands");
522
523 register_command(cmd_ctx, armv4_5_cmd, "reg",
524 handle_armv4_5_reg_command, COMMAND_EXEC,
525 "display ARM core registers");
526 register_command(cmd_ctx, armv4_5_cmd, "core_state",
527 handle_armv4_5_core_state_command, COMMAND_EXEC,
528 "display/change ARM core state <arm | thumb>");
529 register_command(cmd_ctx, armv4_5_cmd, "disassemble",
530 handle_armv4_5_disassemble_command, COMMAND_EXEC,
531 "disassemble instructions "
532 "<address> [<count> ['thumb']]");
533
534 return ERROR_OK;
535 }
536
537 int armv4_5_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int *reg_list_size)
538 {
539 struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
540 int i;
541
542 if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
543 return ERROR_FAIL;
544
545 *reg_list_size = 26;
546 *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
547
548 for (i = 0; i < 16; i++)
549 {
550 (*reg_list)[i] = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i);
551 }
552
553 for (i = 16; i < 24; i++)
554 {
555 (*reg_list)[i] = &armv4_5_gdb_dummy_fp_reg;
556 }
557
558 (*reg_list)[24] = &armv4_5_gdb_dummy_fps_reg;
559 (*reg_list)[25] = &armv4_5->core_cache->reg_list[ARMV4_5_CPSR];
560
561 return ERROR_OK;
562 }
563
564 /* wait for execution to complete and check exit point */
565 static int armv4_5_run_algorithm_completion(struct target *target, uint32_t exit_point, int timeout_ms, void *arch_info)
566 {
567 int retval;
568 struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
569
570 if ((retval = target_wait_state(target, TARGET_HALTED, timeout_ms)) != ERROR_OK)
571 {
572 return retval;
573 }
574 if (target->state != TARGET_HALTED)
575 {
576 if ((retval = target_halt(target)) != ERROR_OK)
577 return retval;
578 if ((retval = target_wait_state(target, TARGET_HALTED, 500)) != ERROR_OK)
579 {
580 return retval;
581 }
582 return ERROR_TARGET_TIMEOUT;
583 }
584
585 /* fast exit: ARMv5+ code can use BKPT */
586 if (exit_point && buf_get_u32(armv4_5->core_cache->reg_list[15].value,
587 0, 32) != exit_point)
588 {
589 LOG_WARNING("target reentered debug state, but not at the desired exit point: 0x%4.4" PRIx32 "",
590 buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
591 return ERROR_TARGET_TIMEOUT;
592 }
593
594 return ERROR_OK;
595 }
596
597 int armv4_5_run_algorithm_inner(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, int (*run_it)(struct target *target, uint32_t exit_point, int timeout_ms, void *arch_info))
598 {
599 struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
600 struct armv4_5_algorithm *armv4_5_algorithm_info = arch_info;
601 enum armv4_5_state core_state = armv4_5->core_state;
602 enum armv4_5_mode core_mode = armv4_5->core_mode;
603 uint32_t context[17];
604 uint32_t cpsr;
605 int exit_breakpoint_size = 0;
606 int i;
607 int retval = ERROR_OK;
608 LOG_DEBUG("Running algorithm");
609
610 if (armv4_5_algorithm_info->common_magic != ARMV4_5_COMMON_MAGIC)
611 {
612 LOG_ERROR("current target isn't an ARMV4/5 target");
613 return ERROR_TARGET_INVALID;
614 }
615
616 if (target->state != TARGET_HALTED)
617 {
618 LOG_WARNING("target not halted");
619 return ERROR_TARGET_NOT_HALTED;
620 }
621
622 if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
623 return ERROR_FAIL;
624
625 /* armv5 and later can terminate with BKPT instruction; less overhead */
626 if (!exit_point && armv4_5->is_armv4)
627 {
628 LOG_ERROR("ARMv4 target needs HW breakpoint location");
629 return ERROR_FAIL;
630 }
631
632 for (i = 0; i <= 16; i++)
633 {
634 if (!ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).valid)
635 armv4_5->read_core_reg(target, i, armv4_5_algorithm_info->core_mode);
636 context[i] = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32);
637 }
638 cpsr = buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32);
639
640 for (i = 0; i < num_mem_params; i++)
641 {
642 if ((retval = target_write_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
643 {
644 return retval;
645 }
646 }
647
648 for (i = 0; i < num_reg_params; i++)
649 {
650 struct reg *reg = register_get_by_name(armv4_5->core_cache, reg_params[i].reg_name, 0);
651 if (!reg)
652 {
653 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
654 return ERROR_INVALID_ARGUMENTS;
655 }
656
657 if (reg->size != reg_params[i].size)
658 {
659 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
660 return ERROR_INVALID_ARGUMENTS;
661 }
662
663 if ((retval = armv4_5_set_core_reg(reg, reg_params[i].value)) != ERROR_OK)
664 {
665 return retval;
666 }
667 }
668
669 armv4_5->core_state = armv4_5_algorithm_info->core_state;
670 if (armv4_5->core_state == ARMV4_5_STATE_ARM)
671 exit_breakpoint_size = 4;
672 else if (armv4_5->core_state == ARMV4_5_STATE_THUMB)
673 exit_breakpoint_size = 2;
674 else
675 {
676 LOG_ERROR("BUG: can't execute algorithms when not in ARM or Thumb state");
677 return ERROR_INVALID_ARGUMENTS;
678 }
679
680 if (armv4_5_algorithm_info->core_mode != ARMV4_5_MODE_ANY)
681 {
682 LOG_DEBUG("setting core_mode: 0x%2.2x", armv4_5_algorithm_info->core_mode);
683 buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 5, armv4_5_algorithm_info->core_mode);
684 armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
685 armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
686 }
687
688 /* terminate using a hardware or (ARMv5+) software breakpoint */
689 if (exit_point && (retval = breakpoint_add(target, exit_point,
690 exit_breakpoint_size, BKPT_HARD)) != ERROR_OK)
691 {
692 LOG_ERROR("can't add HW breakpoint to terminate algorithm");
693 return ERROR_TARGET_FAILURE;
694 }
695
696 if ((retval = target_resume(target, 0, entry_point, 1, 1)) != ERROR_OK)
697 {
698 return retval;
699 }
700 int retvaltemp;
701 retval = run_it(target, exit_point, timeout_ms, arch_info);
702
703 if (exit_point)
704 breakpoint_remove(target, exit_point);
705
706 if (retval != ERROR_OK)
707 return retval;
708
709 for (i = 0; i < num_mem_params; i++)
710 {
711 if (mem_params[i].direction != PARAM_OUT)
712 if ((retvaltemp = target_read_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
713 {
714 retval = retvaltemp;
715 }
716 }
717
718 for (i = 0; i < num_reg_params; i++)
719 {
720 if (reg_params[i].direction != PARAM_OUT)
721 {
722
723 struct reg *reg = register_get_by_name(armv4_5->core_cache, reg_params[i].reg_name, 0);
724 if (!reg)
725 {
726 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
727 retval = ERROR_INVALID_ARGUMENTS;
728 continue;
729 }
730
731 if (reg->size != reg_params[i].size)
732 {
733 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
734 retval = ERROR_INVALID_ARGUMENTS;
735 continue;
736 }
737
738 buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
739 }
740 }
741
742 for (i = 0; i <= 16; i++)
743 {
744 uint32_t regvalue;
745 regvalue = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32);
746 if (regvalue != context[i])
747 {
748 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32 "", ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).name, context[i]);
749 buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32, context[i]);
750 ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).valid = 1;
751 ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).dirty = 1;
752 }
753 }
754 buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32, cpsr);
755 armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
756 armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
757
758 armv4_5->core_state = core_state;
759 armv4_5->core_mode = core_mode;
760
761 return retval;
762 }
763
764 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)
765 {
766 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);
767 }
768
769 /**
770 * Runs ARM code in the target to calculate a CRC32 checksum.
771 *
772 * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
773 */
774 int arm_checksum_memory(struct target *target,
775 uint32_t address, uint32_t count, uint32_t *checksum)
776 {
777 struct working_area *crc_algorithm;
778 struct armv4_5_algorithm armv4_5_info;
779 struct reg_param reg_params[2];
780 int retval;
781 uint32_t i;
782
783 static const uint32_t arm_crc_code[] = {
784 0xE1A02000, /* mov r2, r0 */
785 0xE3E00000, /* mov r0, #0xffffffff */
786 0xE1A03001, /* mov r3, r1 */
787 0xE3A04000, /* mov r4, #0 */
788 0xEA00000B, /* b ncomp */
789 /* nbyte: */
790 0xE7D21004, /* ldrb r1, [r2, r4] */
791 0xE59F7030, /* ldr r7, CRC32XOR */
792 0xE0200C01, /* eor r0, r0, r1, asl 24 */
793 0xE3A05000, /* mov r5, #0 */
794 /* loop: */
795 0xE3500000, /* cmp r0, #0 */
796 0xE1A06080, /* mov r6, r0, asl #1 */
797 0xE2855001, /* add r5, r5, #1 */
798 0xE1A00006, /* mov r0, r6 */
799 0xB0260007, /* eorlt r0, r6, r7 */
800 0xE3550008, /* cmp r5, #8 */
801 0x1AFFFFF8, /* bne loop */
802 0xE2844001, /* add r4, r4, #1 */
803 /* ncomp: */
804 0xE1540003, /* cmp r4, r3 */
805 0x1AFFFFF1, /* bne nbyte */
806 /* end: */
807 0xEAFFFFFE, /* b end */
808 /* CRC32XOR: */
809 0x04C11DB7 /* .word 0x04C11DB7 */
810 };
811
812 retval = target_alloc_working_area(target,
813 sizeof(arm_crc_code), &crc_algorithm);
814 if (retval != ERROR_OK)
815 return retval;
816
817 /* convert code into a buffer in target endianness */
818 for (i = 0; i < ARRAY_SIZE(arm_crc_code); i++) {
819 retval = target_write_u32(target,
820 crc_algorithm->address + i * sizeof(uint32_t),
821 arm_crc_code[i]);
822 if (retval != ERROR_OK)
823 return retval;
824 }
825
826 armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
827 armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
828 armv4_5_info.core_state = ARMV4_5_STATE_ARM;
829
830 init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
831 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
832
833 buf_set_u32(reg_params[0].value, 0, 32, address);
834 buf_set_u32(reg_params[1].value, 0, 32, count);
835
836 /* 20 second timeout/megabyte */
837 int timeout = 20000 * (1 + (count / (1024 * 1024)));
838
839 retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
840 crc_algorithm->address,
841 crc_algorithm->address + sizeof(arm_crc_code) - 8,
842 timeout, &armv4_5_info);
843 if (retval != ERROR_OK) {
844 LOG_ERROR("error executing ARM crc algorithm");
845 destroy_reg_param(&reg_params[0]);
846 destroy_reg_param(&reg_params[1]);
847 target_free_working_area(target, crc_algorithm);
848 return retval;
849 }
850
851 *checksum = buf_get_u32(reg_params[0].value, 0, 32);
852
853 destroy_reg_param(&reg_params[0]);
854 destroy_reg_param(&reg_params[1]);
855
856 target_free_working_area(target, crc_algorithm);
857
858 return ERROR_OK;
859 }
860
861 /**
862 * Runs ARM code in the target to check whether a memory block holds
863 * all ones. NOR flash which has been erased, and thus may be written,
864 * holds all ones.
865 *
866 * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
867 */
868 int arm_blank_check_memory(struct target *target,
869 uint32_t address, uint32_t count, uint32_t *blank)
870 {
871 struct working_area *check_algorithm;
872 struct reg_param reg_params[3];
873 struct armv4_5_algorithm armv4_5_info;
874 int retval;
875 uint32_t i;
876
877 static const uint32_t check_code[] = {
878 /* loop: */
879 0xe4d03001, /* ldrb r3, [r0], #1 */
880 0xe0022003, /* and r2, r2, r3 */
881 0xe2511001, /* subs r1, r1, #1 */
882 0x1afffffb, /* bne loop */
883 /* end: */
884 0xeafffffe /* b end */
885 };
886
887 /* make sure we have a working area */
888 retval = target_alloc_working_area(target,
889 sizeof(check_code), &check_algorithm);
890 if (retval != ERROR_OK)
891 return retval;
892
893 /* convert code into a buffer in target endianness */
894 for (i = 0; i < ARRAY_SIZE(check_code); i++) {
895 retval = target_write_u32(target,
896 check_algorithm->address
897 + i * sizeof(uint32_t),
898 check_code[i]);
899 if (retval != ERROR_OK)
900 return retval;
901 }
902
903 armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
904 armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
905 armv4_5_info.core_state = ARMV4_5_STATE_ARM;
906
907 init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
908 buf_set_u32(reg_params[0].value, 0, 32, address);
909
910 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
911 buf_set_u32(reg_params[1].value, 0, 32, count);
912
913 init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
914 buf_set_u32(reg_params[2].value, 0, 32, 0xff);
915
916 retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
917 check_algorithm->address,
918 check_algorithm->address + sizeof(check_code) - 4,
919 10000, &armv4_5_info);
920 if (retval != ERROR_OK) {
921 destroy_reg_param(&reg_params[0]);
922 destroy_reg_param(&reg_params[1]);
923 destroy_reg_param(&reg_params[2]);
924 target_free_working_area(target, check_algorithm);
925 return retval;
926 }
927
928 *blank = buf_get_u32(reg_params[2].value, 0, 32);
929
930 destroy_reg_param(&reg_params[0]);
931 destroy_reg_param(&reg_params[1]);
932 destroy_reg_param(&reg_params[2]);
933
934 target_free_working_area(target, check_algorithm);
935
936 return ERROR_OK;
937 }
938
939 int armv4_5_init_arch_info(struct target *target, struct arm *armv4_5)
940 {
941 target->arch_info = armv4_5;
942
943 armv4_5->common_magic = ARMV4_5_COMMON_MAGIC;
944 armv4_5->core_state = ARMV4_5_STATE_ARM;
945 armv4_5->core_mode = ARMV4_5_MODE_USR;
946
947 return ERROR_OK;
948 }
Zach's Unofficial Testing Repository