Change return value on error.
[openocd.git] / src / target / mips32.c
1 /***************************************************************************
2 * Copyright (C) 2008 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
4 * *
5 * Copyright (C) 2008 by David T.L. Wong *
6 * *
7 * Copyright (C) 2007,2008 √ėyvind Harboe *
8 * oyvind.harboe@zylin.com *
9 * *
10 * Copyright (C) 2011 by Drasko DRASKOVIC *
11 * drasko.draskovic@gmail.com *
12 * *
13 * This program is free software; you can redistribute it and/or modify *
14 * it under the terms of the GNU General Public License as published by *
15 * the Free Software Foundation; either version 2 of the License, or *
16 * (at your option) any later version. *
17 * *
18 * This program is distributed in the hope that it will be useful, *
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
21 * GNU General Public License for more details. *
22 * *
23 * You should have received a copy of the GNU General Public License *
24 * along with this program; if not, write to the *
25 * Free Software Foundation, Inc., *
26 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
27 ***************************************************************************/
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "mips32.h"
33 #include "breakpoints.h"
34 #include "algorithm.h"
35 #include "register.h"
36
37 static char* mips32_core_reg_list[] =
38 {
39 "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
40 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
41 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
42 "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra",
43 "status", "lo", "hi", "badvaddr", "cause", "pc"
44 };
45
46 static const char *mips_isa_strings[] =
47 {
48 "MIPS32", "MIPS16e"
49 };
50
51 static struct mips32_core_reg mips32_core_reg_list_arch_info[MIPS32NUMCOREREGS] =
52 {
53 {0, NULL, NULL},
54 {1, NULL, NULL},
55 {2, NULL, NULL},
56 {3, NULL, NULL},
57 {4, NULL, NULL},
58 {5, NULL, NULL},
59 {6, NULL, NULL},
60 {7, NULL, NULL},
61 {8, NULL, NULL},
62 {9, NULL, NULL},
63 {10, NULL, NULL},
64 {11, NULL, NULL},
65 {12, NULL, NULL},
66 {13, NULL, NULL},
67 {14, NULL, NULL},
68 {15, NULL, NULL},
69 {16, NULL, NULL},
70 {17, NULL, NULL},
71 {18, NULL, NULL},
72 {19, NULL, NULL},
73 {20, NULL, NULL},
74 {21, NULL, NULL},
75 {22, NULL, NULL},
76 {23, NULL, NULL},
77 {24, NULL, NULL},
78 {25, NULL, NULL},
79 {26, NULL, NULL},
80 {27, NULL, NULL},
81 {28, NULL, NULL},
82 {29, NULL, NULL},
83 {30, NULL, NULL},
84 {31, NULL, NULL},
85
86 {32, NULL, NULL},
87 {33, NULL, NULL},
88 {34, NULL, NULL},
89 {35, NULL, NULL},
90 {36, NULL, NULL},
91 {37, NULL, NULL},
92 };
93
94 /* number of mips dummy fp regs fp0 - fp31 + fsr and fir
95 * we also add 18 unknown registers to handle gdb requests */
96
97 #define MIPS32NUMFPREGS 34 + 18
98
99 static uint8_t mips32_gdb_dummy_fp_value[] = {0, 0, 0, 0};
100
101 static struct reg mips32_gdb_dummy_fp_reg =
102 {
103 .name = "GDB dummy floating-point register",
104 .value = mips32_gdb_dummy_fp_value,
105 .dirty = 0,
106 .valid = 1,
107 .size = 32,
108 .arch_info = NULL,
109 };
110
111 static int mips32_get_core_reg(struct reg *reg)
112 {
113 int retval;
114 struct mips32_core_reg *mips32_reg = reg->arch_info;
115 struct target *target = mips32_reg->target;
116 struct mips32_common *mips32_target = target_to_mips32(target);
117
118 if (target->state != TARGET_HALTED)
119 {
120 return ERROR_TARGET_NOT_HALTED;
121 }
122
123 retval = mips32_target->read_core_reg(target, mips32_reg->num);
124
125 return retval;
126 }
127
128 static int mips32_set_core_reg(struct reg *reg, uint8_t *buf)
129 {
130 struct mips32_core_reg *mips32_reg = reg->arch_info;
131 struct target *target = mips32_reg->target;
132 uint32_t value = buf_get_u32(buf, 0, 32);
133
134 if (target->state != TARGET_HALTED)
135 {
136 return ERROR_TARGET_NOT_HALTED;
137 }
138
139 buf_set_u32(reg->value, 0, 32, value);
140 reg->dirty = 1;
141 reg->valid = 1;
142
143 return ERROR_OK;
144 }
145
146 static int mips32_read_core_reg(struct target *target, int num)
147 {
148 uint32_t reg_value;
149
150 /* get pointers to arch-specific information */
151 struct mips32_common *mips32 = target_to_mips32(target);
152
153 if ((num < 0) || (num >= MIPS32NUMCOREREGS))
154 return ERROR_COMMAND_SYNTAX_ERROR;
155
156 reg_value = mips32->core_regs[num];
157 buf_set_u32(mips32->core_cache->reg_list[num].value, 0, 32, reg_value);
158 mips32->core_cache->reg_list[num].valid = 1;
159 mips32->core_cache->reg_list[num].dirty = 0;
160
161 return ERROR_OK;
162 }
163
164 static int mips32_write_core_reg(struct target *target, int num)
165 {
166 uint32_t reg_value;
167
168 /* get pointers to arch-specific information */
169 struct mips32_common *mips32 = target_to_mips32(target);
170
171 if ((num < 0) || (num >= MIPS32NUMCOREREGS))
172 return ERROR_COMMAND_SYNTAX_ERROR;
173
174 reg_value = buf_get_u32(mips32->core_cache->reg_list[num].value, 0, 32);
175 mips32->core_regs[num] = reg_value;
176 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", num , reg_value);
177 mips32->core_cache->reg_list[num].valid = 1;
178 mips32->core_cache->reg_list[num].dirty = 0;
179
180 return ERROR_OK;
181 }
182
183 int mips32_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int *reg_list_size)
184 {
185 /* get pointers to arch-specific information */
186 struct mips32_common *mips32 = target_to_mips32(target);
187 int i;
188
189 /* include floating point registers */
190 *reg_list_size = MIPS32NUMCOREREGS + MIPS32NUMFPREGS;
191 *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
192
193 for (i = 0; i < MIPS32NUMCOREREGS; i++)
194 {
195 (*reg_list)[i] = &mips32->core_cache->reg_list[i];
196 }
197
198 /* add dummy floating points regs */
199 for (i = MIPS32NUMCOREREGS; i < (MIPS32NUMCOREREGS + MIPS32NUMFPREGS); i++)
200 {
201 (*reg_list)[i] = &mips32_gdb_dummy_fp_reg;
202 }
203
204 return ERROR_OK;
205 }
206
207 int mips32_save_context(struct target *target)
208 {
209 int i;
210
211 /* get pointers to arch-specific information */
212 struct mips32_common *mips32 = target_to_mips32(target);
213 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
214
215 /* read core registers */
216 mips32_pracc_read_regs(ejtag_info, mips32->core_regs);
217
218 for (i = 0; i < MIPS32NUMCOREREGS; i++)
219 {
220 if (!mips32->core_cache->reg_list[i].valid)
221 {
222 mips32->read_core_reg(target, i);
223 }
224 }
225
226 return ERROR_OK;
227 }
228
229 int mips32_restore_context(struct target *target)
230 {
231 int i;
232
233 /* get pointers to arch-specific information */
234 struct mips32_common *mips32 = target_to_mips32(target);
235 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
236
237 for (i = 0; i < MIPS32NUMCOREREGS; i++)
238 {
239 if (mips32->core_cache->reg_list[i].dirty)
240 {
241 mips32->write_core_reg(target, i);
242 }
243 }
244
245 /* write core regs */
246 mips32_pracc_write_regs(ejtag_info, mips32->core_regs);
247
248 return ERROR_OK;
249 }
250
251 int mips32_arch_state(struct target *target)
252 {
253 struct mips32_common *mips32 = target_to_mips32(target);
254
255 LOG_USER("target halted in %s mode due to %s, pc: 0x%8.8" PRIx32 "",
256 mips_isa_strings[mips32->isa_mode],
257 debug_reason_name(target),
258 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
259
260 return ERROR_OK;
261 }
262
263 static const struct reg_arch_type mips32_reg_type = {
264 .get = mips32_get_core_reg,
265 .set = mips32_set_core_reg,
266 };
267
268 struct reg_cache *mips32_build_reg_cache(struct target *target)
269 {
270 /* get pointers to arch-specific information */
271 struct mips32_common *mips32 = target_to_mips32(target);
272
273 int num_regs = MIPS32NUMCOREREGS;
274 struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
275 struct reg_cache *cache = malloc(sizeof(struct reg_cache));
276 struct reg *reg_list = malloc(sizeof(struct reg) * num_regs);
277 struct mips32_core_reg *arch_info = malloc(sizeof(struct mips32_core_reg) * num_regs);
278 int i;
279
280 register_init_dummy(&mips32_gdb_dummy_fp_reg);
281
282 /* Build the process context cache */
283 cache->name = "mips32 registers";
284 cache->next = NULL;
285 cache->reg_list = reg_list;
286 cache->num_regs = num_regs;
287 (*cache_p) = cache;
288 mips32->core_cache = cache;
289
290 for (i = 0; i < num_regs; i++)
291 {
292 arch_info[i] = mips32_core_reg_list_arch_info[i];
293 arch_info[i].target = target;
294 arch_info[i].mips32_common = mips32;
295 reg_list[i].name = mips32_core_reg_list[i];
296 reg_list[i].size = 32;
297 reg_list[i].value = calloc(1, 4);
298 reg_list[i].dirty = 0;
299 reg_list[i].valid = 0;
300 reg_list[i].type = &mips32_reg_type;
301 reg_list[i].arch_info = &arch_info[i];
302 }
303
304 return cache;
305 }
306
307 int mips32_init_arch_info(struct target *target, struct mips32_common *mips32, struct jtag_tap *tap)
308 {
309 target->arch_info = mips32;
310 mips32->common_magic = MIPS32_COMMON_MAGIC;
311 mips32->fast_data_area = NULL;
312
313 /* has breakpoint/watchpint unit been scanned */
314 mips32->bp_scanned = 0;
315 mips32->data_break_list = NULL;
316
317 mips32->ejtag_info.tap = tap;
318 mips32->read_core_reg = mips32_read_core_reg;
319 mips32->write_core_reg = mips32_write_core_reg;
320
321 return ERROR_OK;
322 }
323
324 /* run to exit point. return error if exit point was not reached. */
325 static int mips32_run_and_wait(struct target *target, uint32_t entry_point,
326 int timeout_ms, uint32_t exit_point, struct mips32_common *mips32)
327 {
328 uint32_t pc;
329 int retval;
330 /* This code relies on the target specific resume() and poll()->debug_entry()
331 * sequence to write register values to the processor and the read them back */
332 if ((retval = target_resume(target, 0, entry_point, 0, 1)) != ERROR_OK)
333 {
334 return retval;
335 }
336
337 retval = target_wait_state(target, TARGET_HALTED, timeout_ms);
338 /* If the target fails to halt due to the breakpoint, force a halt */
339 if (retval != ERROR_OK || target->state != TARGET_HALTED)
340 {
341 if ((retval = target_halt(target)) != ERROR_OK)
342 return retval;
343 if ((retval = target_wait_state(target, TARGET_HALTED, 500)) != ERROR_OK)
344 {
345 return retval;
346 }
347 return ERROR_TARGET_TIMEOUT;
348 }
349
350 pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
351 if (exit_point && (pc != exit_point))
352 {
353 LOG_DEBUG("failed algorithm halted at 0x%" PRIx32 " ", pc);
354 return ERROR_TARGET_TIMEOUT;
355 }
356
357 return ERROR_OK;
358 }
359
360 int mips32_run_algorithm(struct target *target, int num_mem_params,
361 struct mem_param *mem_params, int num_reg_params,
362 struct reg_param *reg_params, uint32_t entry_point,
363 uint32_t exit_point, int timeout_ms, void *arch_info)
364 {
365 struct mips32_common *mips32 = target_to_mips32(target);
366 struct mips32_algorithm *mips32_algorithm_info = arch_info;
367 enum mips32_isa_mode isa_mode = mips32->isa_mode;
368
369 uint32_t context[MIPS32NUMCOREREGS];
370 int i;
371 int retval = ERROR_OK;
372
373 LOG_DEBUG("Running algorithm");
374
375 /* NOTE: mips32_run_algorithm requires that each algorithm uses a software breakpoint
376 * at the exit point */
377
378 if (mips32->common_magic != MIPS32_COMMON_MAGIC)
379 {
380 LOG_ERROR("current target isn't a MIPS32 target");
381 return ERROR_TARGET_INVALID;
382 }
383
384 if (target->state != TARGET_HALTED)
385 {
386 LOG_WARNING("target not halted");
387 return ERROR_TARGET_NOT_HALTED;
388 }
389
390 /* refresh core register cache */
391 for (i = 0; i < MIPS32NUMCOREREGS; i++)
392 {
393 if (!mips32->core_cache->reg_list[i].valid)
394 mips32->read_core_reg(target, i);
395 context[i] = buf_get_u32(mips32->core_cache->reg_list[i].value, 0, 32);
396 }
397
398 for (i = 0; i < num_mem_params; i++)
399 {
400 if ((retval = target_write_buffer(target, mem_params[i].address,
401 mem_params[i].size, mem_params[i].value)) != ERROR_OK)
402 {
403 return retval;
404 }
405 }
406
407 for (i = 0; i < num_reg_params; i++)
408 {
409 struct reg *reg = register_get_by_name(mips32->core_cache, reg_params[i].reg_name, 0);
410
411 if (!reg)
412 {
413 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
414 return ERROR_COMMAND_SYNTAX_ERROR;
415 }
416
417 if (reg->size != reg_params[i].size)
418 {
419 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
420 reg_params[i].reg_name);
421 return ERROR_COMMAND_SYNTAX_ERROR;
422 }
423
424 mips32_set_core_reg(reg, reg_params[i].value);
425 }
426
427 mips32->isa_mode = mips32_algorithm_info->isa_mode;
428
429 retval = mips32_run_and_wait(target, entry_point, timeout_ms, exit_point, mips32);
430
431 if (retval != ERROR_OK)
432 return retval;
433
434 for (i = 0; i < num_mem_params; i++)
435 {
436 if (mem_params[i].direction != PARAM_OUT)
437 {
438 if ((retval = target_read_buffer(target, mem_params[i].address, mem_params[i].size,
439 mem_params[i].value)) != ERROR_OK)
440 {
441 return retval;
442 }
443 }
444 }
445
446 for (i = 0; i < num_reg_params; i++)
447 {
448 if (reg_params[i].direction != PARAM_OUT)
449 {
450 struct reg *reg = register_get_by_name(mips32->core_cache, reg_params[i].reg_name, 0);
451 if (!reg)
452 {
453 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
454 return ERROR_COMMAND_SYNTAX_ERROR;
455 }
456
457 if (reg->size != reg_params[i].size)
458 {
459 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
460 reg_params[i].reg_name);
461 return ERROR_COMMAND_SYNTAX_ERROR;
462 }
463
464 buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
465 }
466 }
467
468 /* restore everything we saved before */
469 for (i = 0; i < MIPS32NUMCOREREGS; i++)
470 {
471 uint32_t regvalue;
472 regvalue = buf_get_u32(mips32->core_cache->reg_list[i].value, 0, 32);
473 if (regvalue != context[i])
474 {
475 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32,
476 mips32->core_cache->reg_list[i].name, context[i]);
477 buf_set_u32(mips32->core_cache->reg_list[i].value,
478 0, 32, context[i]);
479 mips32->core_cache->reg_list[i].valid = 1;
480 mips32->core_cache->reg_list[i].dirty = 1;
481 }
482 }
483
484 mips32->isa_mode = isa_mode;
485
486 return ERROR_OK;
487 }
488
489 int mips32_examine(struct target *target)
490 {
491 struct mips32_common *mips32 = target_to_mips32(target);
492
493 if (!target_was_examined(target))
494 {
495 target_set_examined(target);
496
497 /* we will configure later */
498 mips32->bp_scanned = 0;
499 mips32->num_inst_bpoints = 0;
500 mips32->num_data_bpoints = 0;
501 mips32->num_inst_bpoints_avail = 0;
502 mips32->num_data_bpoints_avail = 0;
503 }
504
505 return ERROR_OK;
506 }
507
508 int mips32_configure_break_unit(struct target *target)
509 {
510 /* get pointers to arch-specific information */
511 struct mips32_common *mips32 = target_to_mips32(target);
512 int retval;
513 uint32_t dcr, bpinfo;
514 int i;
515
516 if (mips32->bp_scanned)
517 return ERROR_OK;
518
519 /* get info about breakpoint support */
520 if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
521 return retval;
522
523 if (dcr & EJTAG_DCR_IB)
524 {
525 /* get number of inst breakpoints */
526 if ((retval = target_read_u32(target, EJTAG_IBS, &bpinfo)) != ERROR_OK)
527 return retval;
528
529 mips32->num_inst_bpoints = (bpinfo >> 24) & 0x0F;
530 mips32->num_inst_bpoints_avail = mips32->num_inst_bpoints;
531 mips32->inst_break_list = calloc(mips32->num_inst_bpoints, sizeof(struct mips32_comparator));
532 for (i = 0; i < mips32->num_inst_bpoints; i++)
533 {
534 mips32->inst_break_list[i].reg_address = EJTAG_IBA1 + (0x100 * i);
535 }
536
537 /* clear IBIS reg */
538 if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
539 return retval;
540 }
541
542 if (dcr & EJTAG_DCR_DB)
543 {
544 /* get number of data breakpoints */
545 if ((retval = target_read_u32(target, EJTAG_DBS, &bpinfo)) != ERROR_OK)
546 return retval;
547
548 mips32->num_data_bpoints = (bpinfo >> 24) & 0x0F;
549 mips32->num_data_bpoints_avail = mips32->num_data_bpoints;
550 mips32->data_break_list = calloc(mips32->num_data_bpoints, sizeof(struct mips32_comparator));
551 for (i = 0; i < mips32->num_data_bpoints; i++)
552 {
553 mips32->data_break_list[i].reg_address = EJTAG_DBA1 + (0x100 * i);
554 }
555
556 /* clear DBIS reg */
557 if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
558 return retval;
559 }
560
561 /* check if target endianness settings matches debug control register */
562 if ( ( (dcr & EJTAG_DCR_ENM) && (target->endianness == TARGET_LITTLE_ENDIAN) ) ||
563 ( !(dcr & EJTAG_DCR_ENM) && (target->endianness == TARGET_BIG_ENDIAN) ) )
564 {
565 LOG_WARNING("DCR endianness settings does not match target settings");
566 }
567
568 LOG_DEBUG("DCR 0x%" PRIx32 " numinst %i numdata %i", dcr, mips32->num_inst_bpoints,
569 mips32->num_data_bpoints);
570
571 mips32->bp_scanned = 1;
572
573 return ERROR_OK;
574 }
575
576 int mips32_enable_interrupts(struct target *target, int enable)
577 {
578 int retval;
579 int update = 0;
580 uint32_t dcr;
581
582 /* read debug control register */
583 if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
584 return retval;
585
586 if (enable)
587 {
588 if (!(dcr & EJTAG_DCR_INTE))
589 {
590 /* enable interrupts */
591 dcr |= EJTAG_DCR_INTE;
592 update = 1;
593 }
594 }
595 else
596 {
597 if (dcr & EJTAG_DCR_INTE)
598 {
599 /* disable interrupts */
600 dcr &= ~EJTAG_DCR_INTE;
601 update = 1;
602 }
603 }
604
605 if (update)
606 {
607 if ((retval = target_write_u32(target, EJTAG_DCR, dcr)) != ERROR_OK)
608 return retval;
609 }
610
611 return ERROR_OK;
612 }
613
614 int mips32_checksum_memory(struct target *target, uint32_t address,
615 uint32_t count, uint32_t* checksum)
616 {
617 struct working_area *crc_algorithm;
618 struct reg_param reg_params[2];
619 struct mips32_algorithm mips32_info;
620 int retval;
621 uint32_t i;
622
623 /* see contib/loaders/checksum/mips32.s for src */
624
625 static const uint32_t mips_crc_code[] =
626 {
627 0x248C0000, /* addiu $t4, $a0, 0 */
628 0x24AA0000, /* addiu $t2, $a1, 0 */
629 0x2404FFFF, /* addiu $a0, $zero, 0xffffffff */
630 0x10000010, /* beq $zero, $zero, ncomp */
631 0x240B0000, /* addiu $t3, $zero, 0 */
632 /* nbyte: */
633 0x81850000, /* lb $a1, ($t4) */
634 0x218C0001, /* addi $t4, $t4, 1 */
635 0x00052E00, /* sll $a1, $a1, 24 */
636 0x3C0204C1, /* lui $v0, 0x04c1 */
637 0x00852026, /* xor $a0, $a0, $a1 */
638 0x34471DB7, /* ori $a3, $v0, 0x1db7 */
639 0x00003021, /* addu $a2, $zero, $zero */
640 /* loop: */
641 0x00044040, /* sll $t0, $a0, 1 */
642 0x24C60001, /* addiu $a2, $a2, 1 */
643 0x28840000, /* slti $a0, $a0, 0 */
644 0x01074826, /* xor $t1, $t0, $a3 */
645 0x0124400B, /* movn $t0, $t1, $a0 */
646 0x28C30008, /* slti $v1, $a2, 8 */
647 0x1460FFF9, /* bne $v1, $zero, loop */
648 0x01002021, /* addu $a0, $t0, $zero */
649 /* ncomp: */
650 0x154BFFF0, /* bne $t2, $t3, nbyte */
651 0x256B0001, /* addiu $t3, $t3, 1 */
652 0x7000003F, /* sdbbp */
653 };
654
655 /* make sure we have a working area */
656 if (target_alloc_working_area(target, sizeof(mips_crc_code), &crc_algorithm) != ERROR_OK)
657 {
658 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
659 }
660
661 /* convert flash writing code into a buffer in target endianness */
662 for (i = 0; i < ARRAY_SIZE(mips_crc_code); i++)
663 target_write_u32(target, crc_algorithm->address + i*sizeof(uint32_t), mips_crc_code[i]);
664
665 mips32_info.common_magic = MIPS32_COMMON_MAGIC;
666 mips32_info.isa_mode = MIPS32_ISA_MIPS32;
667
668 init_reg_param(&reg_params[0], "a0", 32, PARAM_IN_OUT);
669 buf_set_u32(reg_params[0].value, 0, 32, address);
670
671 init_reg_param(&reg_params[1], "a1", 32, PARAM_OUT);
672 buf_set_u32(reg_params[1].value, 0, 32, count);
673
674 int timeout = 20000 * (1 + (count / (1024 * 1024)));
675
676 if ((retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
677 crc_algorithm->address, crc_algorithm->address + (sizeof(mips_crc_code)-4), timeout,
678 &mips32_info)) != ERROR_OK)
679 {
680 destroy_reg_param(&reg_params[0]);
681 destroy_reg_param(&reg_params[1]);
682 target_free_working_area(target, crc_algorithm);
683 return 0;
684 }
685
686 *checksum = buf_get_u32(reg_params[0].value, 0, 32);
687
688 destroy_reg_param(&reg_params[0]);
689 destroy_reg_param(&reg_params[1]);
690
691 target_free_working_area(target, crc_algorithm);
692
693 return ERROR_OK;
694 }
695
696 /** Checks whether a memory region is zeroed. */
697 int mips32_blank_check_memory(struct target *target,
698 uint32_t address, uint32_t count, uint32_t* blank)
699 {
700 struct working_area *erase_check_algorithm;
701 struct reg_param reg_params[3];
702 struct mips32_algorithm mips32_info;
703 int retval;
704 uint32_t i;
705
706 static const uint32_t erase_check_code[] =
707 {
708 /* nbyte: */
709 0x80880000, /* lb $t0, ($a0) */
710 0x00C83024, /* and $a2, $a2, $t0 */
711 0x24A5FFFF, /* addiu $a1, $a1, -1 */
712 0x14A0FFFC, /* bne $a1, $zero, nbyte */
713 0x24840001, /* addiu $a0, $a0, 1 */
714 0x7000003F /* sdbbp */
715 };
716
717 /* make sure we have a working area */
718 if (target_alloc_working_area(target, sizeof(erase_check_code), &erase_check_algorithm) != ERROR_OK)
719 {
720 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
721 }
722
723 /* convert flash writing code into a buffer in target endianness */
724 for (i = 0; i < ARRAY_SIZE(erase_check_code); i++)
725 {
726 target_write_u32(target, erase_check_algorithm->address + i*sizeof(uint32_t),
727 erase_check_code[i]);
728 }
729
730 mips32_info.common_magic = MIPS32_COMMON_MAGIC;
731 mips32_info.isa_mode = MIPS32_ISA_MIPS32;
732
733 init_reg_param(&reg_params[0], "a0", 32, PARAM_OUT);
734 buf_set_u32(reg_params[0].value, 0, 32, address);
735
736 init_reg_param(&reg_params[1], "a1", 32, PARAM_OUT);
737 buf_set_u32(reg_params[1].value, 0, 32, count);
738
739 init_reg_param(&reg_params[2], "a2", 32, PARAM_IN_OUT);
740 buf_set_u32(reg_params[2].value, 0, 32, 0xff);
741
742 if ((retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
743 erase_check_algorithm->address,
744 erase_check_algorithm->address + (sizeof(erase_check_code)-2),
745 10000, &mips32_info)) != ERROR_OK)
746 {
747 destroy_reg_param(&reg_params[0]);
748 destroy_reg_param(&reg_params[1]);
749 destroy_reg_param(&reg_params[2]);
750 target_free_working_area(target, erase_check_algorithm);
751 return 0;
752 }
753
754 *blank = buf_get_u32(reg_params[2].value, 0, 32);
755
756 destroy_reg_param(&reg_params[0]);
757 destroy_reg_param(&reg_params[1]);
758 destroy_reg_param(&reg_params[2]);
759
760 target_free_working_area(target, erase_check_algorithm);
761
762 return ERROR_OK;
763 }
764
765 static int mips32_verify_pointer(struct command_context *cmd_ctx,
766 struct mips32_common *mips32)
767 {
768 if (mips32->common_magic != MIPS32_COMMON_MAGIC) {
769 command_print(cmd_ctx, "target is not an MIPS32");
770 return ERROR_TARGET_INVALID;
771 }
772 return ERROR_OK;
773 }
774
775 /**
776 * MIPS32 targets expose command interface
777 * to manipulate CP0 registers
778 */
779 COMMAND_HANDLER(mips32_handle_cp0_command)
780 {
781 int retval;
782 struct target *target = get_current_target(CMD_CTX);
783 struct mips32_common *mips32 = target_to_mips32(target);
784 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
785
786
787 retval = mips32_verify_pointer(CMD_CTX, mips32);
788 if (retval != ERROR_OK)
789 return retval;
790
791 if (target->state != TARGET_HALTED)
792 {
793 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
794 return ERROR_OK;
795 }
796
797 /* two or more argument, access a single register/select (write if third argument is given) */
798 if (CMD_ARGC < 2)
799 {
800 return ERROR_COMMAND_SYNTAX_ERROR;
801 }
802 else
803 {
804 uint32_t cp0_reg, cp0_sel;
805 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], cp0_reg);
806 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], cp0_sel);
807
808 if (CMD_ARGC == 2)
809 {
810 uint32_t value;
811
812 if ((retval = mips32_cp0_read(ejtag_info, &value, cp0_reg, cp0_sel)) != ERROR_OK)
813 {
814 command_print(CMD_CTX,
815 "couldn't access reg %" PRIi32,
816 cp0_reg);
817 return ERROR_OK;
818 }
819 if ((retval = jtag_execute_queue()) != ERROR_OK)
820 {
821 return retval;
822 }
823
824 command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
825 cp0_reg, cp0_sel, value);
826 }
827 else if (CMD_ARGC == 3)
828 {
829 uint32_t value;
830 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], value);
831 if ((retval = mips32_cp0_write(ejtag_info, value, cp0_reg, cp0_sel)) != ERROR_OK)
832 {
833 command_print(CMD_CTX,
834 "couldn't access cp0 reg %" PRIi32 ", select %" PRIi32,
835 cp0_reg, cp0_sel);
836 return ERROR_OK;
837 }
838 command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
839 cp0_reg, cp0_sel, value);
840 }
841 }
842
843 return ERROR_OK;
844 }
845
846 static const struct command_registration mips32_exec_command_handlers[] = {
847 {
848 .name = "cp0",
849 .handler = mips32_handle_cp0_command,
850 .mode = COMMAND_EXEC,
851 .usage = "regnum select [value]",
852 .help = "display/modify cp0 register",
853 },
854 COMMAND_REGISTRATION_DONE
855 };
856
857 const struct command_registration mips32_command_handlers[] = {
858 {
859 .name = "mips32",
860 .mode = COMMAND_ANY,
861 .help = "mips32 command group",
862 .chain = mips32_exec_command_handlers,
863 },
864 COMMAND_REGISTRATION_DONE
865 };
866