75197f170f85f5368e2bce18a1eda6d67522dac7
[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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
27 ***************************************************************************/
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #include "mips32.h"
34 #include "breakpoints.h"
35 #include "algorithm.h"
36 #include "register.h"
37
38 static const char *mips_isa_strings[] = {
39 "MIPS32", "MIPS16e"
40 };
41
42 static const struct {
43 unsigned id;
44 const char *name;
45 } mips32_regs[MIPS32NUMCOREREGS] = {
46 { 0, "zero", },
47 { 1, "at", },
48 { 2, "v0", },
49 { 3, "v1", },
50 { 4, "a0", },
51 { 5, "a1", },
52 { 6, "a2", },
53 { 7, "a3", },
54 { 8, "t0", },
55 { 9, "t1", },
56 { 10, "t2", },
57 { 11, "t3", },
58 { 12, "t4", },
59 { 13, "t5", },
60 { 14, "t6", },
61 { 15, "t7", },
62 { 16, "s0", },
63 { 17, "s1", },
64 { 18, "s2", },
65 { 19, "s3", },
66 { 20, "s4", },
67 { 21, "s5", },
68 { 22, "s6", },
69 { 23, "s7", },
70 { 24, "t8", },
71 { 25, "t9", },
72 { 26, "k0", },
73 { 27, "k1", },
74 { 28, "gp", },
75 { 29, "sp", },
76 { 30, "fp", },
77 { 31, "ra", },
78
79 { 32, "status", },
80 { 33, "lo", },
81 { 34, "hi", },
82 { 35, "badvaddr", },
83 { 36, "cause", },
84 { 37, "pc" },
85 };
86
87 /* number of mips dummy fp regs fp0 - fp31 + fsr and fir
88 * we also add 18 unknown registers to handle gdb requests */
89
90 #define MIPS32NUMFPREGS (34 + 18)
91
92 static uint8_t mips32_gdb_dummy_fp_value[] = {0, 0, 0, 0};
93
94 static struct reg mips32_gdb_dummy_fp_reg = {
95 .name = "GDB dummy floating-point register",
96 .value = mips32_gdb_dummy_fp_value,
97 .dirty = 0,
98 .valid = 1,
99 .size = 32,
100 .arch_info = NULL,
101 };
102
103 static int mips32_get_core_reg(struct reg *reg)
104 {
105 int retval;
106 struct mips32_core_reg *mips32_reg = reg->arch_info;
107 struct target *target = mips32_reg->target;
108 struct mips32_common *mips32_target = target_to_mips32(target);
109
110 if (target->state != TARGET_HALTED)
111 return ERROR_TARGET_NOT_HALTED;
112
113 retval = mips32_target->read_core_reg(target, mips32_reg->num);
114
115 return retval;
116 }
117
118 static int mips32_set_core_reg(struct reg *reg, uint8_t *buf)
119 {
120 struct mips32_core_reg *mips32_reg = reg->arch_info;
121 struct target *target = mips32_reg->target;
122 uint32_t value = buf_get_u32(buf, 0, 32);
123
124 if (target->state != TARGET_HALTED)
125 return ERROR_TARGET_NOT_HALTED;
126
127 buf_set_u32(reg->value, 0, 32, value);
128 reg->dirty = 1;
129 reg->valid = 1;
130
131 return ERROR_OK;
132 }
133
134 static int mips32_read_core_reg(struct target *target, int num)
135 {
136 uint32_t reg_value;
137
138 /* get pointers to arch-specific information */
139 struct mips32_common *mips32 = target_to_mips32(target);
140
141 if ((num < 0) || (num >= MIPS32NUMCOREREGS))
142 return ERROR_COMMAND_SYNTAX_ERROR;
143
144 reg_value = mips32->core_regs[num];
145 buf_set_u32(mips32->core_cache->reg_list[num].value, 0, 32, reg_value);
146 mips32->core_cache->reg_list[num].valid = 1;
147 mips32->core_cache->reg_list[num].dirty = 0;
148
149 return ERROR_OK;
150 }
151
152 static int mips32_write_core_reg(struct target *target, int num)
153 {
154 uint32_t reg_value;
155
156 /* get pointers to arch-specific information */
157 struct mips32_common *mips32 = target_to_mips32(target);
158
159 if ((num < 0) || (num >= MIPS32NUMCOREREGS))
160 return ERROR_COMMAND_SYNTAX_ERROR;
161
162 reg_value = buf_get_u32(mips32->core_cache->reg_list[num].value, 0, 32);
163 mips32->core_regs[num] = reg_value;
164 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", num , reg_value);
165 mips32->core_cache->reg_list[num].valid = 1;
166 mips32->core_cache->reg_list[num].dirty = 0;
167
168 return ERROR_OK;
169 }
170
171 int mips32_get_gdb_reg_list(struct target *target, struct reg **reg_list[],
172 int *reg_list_size, enum target_register_class reg_class)
173 {
174 /* get pointers to arch-specific information */
175 struct mips32_common *mips32 = target_to_mips32(target);
176 int i;
177
178 /* include floating point registers */
179 *reg_list_size = MIPS32NUMCOREREGS + MIPS32NUMFPREGS;
180 *reg_list = malloc(sizeof(struct reg *) * (*reg_list_size));
181
182 for (i = 0; i < MIPS32NUMCOREREGS; i++)
183 (*reg_list)[i] = &mips32->core_cache->reg_list[i];
184
185 /* add dummy floating points regs */
186 for (i = MIPS32NUMCOREREGS; i < (MIPS32NUMCOREREGS + MIPS32NUMFPREGS); i++)
187 (*reg_list)[i] = &mips32_gdb_dummy_fp_reg;
188
189 return ERROR_OK;
190 }
191
192 int mips32_save_context(struct target *target)
193 {
194 int i;
195
196 /* get pointers to arch-specific information */
197 struct mips32_common *mips32 = target_to_mips32(target);
198 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
199
200 /* read core registers */
201 mips32_pracc_read_regs(ejtag_info, mips32->core_regs);
202
203 for (i = 0; i < MIPS32NUMCOREREGS; i++) {
204 if (!mips32->core_cache->reg_list[i].valid)
205 mips32->read_core_reg(target, i);
206 }
207
208 return ERROR_OK;
209 }
210
211 int mips32_restore_context(struct target *target)
212 {
213 int i;
214
215 /* get pointers to arch-specific information */
216 struct mips32_common *mips32 = target_to_mips32(target);
217 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
218
219 for (i = 0; i < MIPS32NUMCOREREGS; i++) {
220 if (mips32->core_cache->reg_list[i].dirty)
221 mips32->write_core_reg(target, i);
222 }
223
224 /* write core regs */
225 mips32_pracc_write_regs(ejtag_info, mips32->core_regs);
226
227 return ERROR_OK;
228 }
229
230 int mips32_arch_state(struct target *target)
231 {
232 struct mips32_common *mips32 = target_to_mips32(target);
233
234 LOG_USER("target halted in %s mode due to %s, pc: 0x%8.8" PRIx32 "",
235 mips_isa_strings[mips32->isa_mode],
236 debug_reason_name(target),
237 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
238
239 return ERROR_OK;
240 }
241
242 static const struct reg_arch_type mips32_reg_type = {
243 .get = mips32_get_core_reg,
244 .set = mips32_set_core_reg,
245 };
246
247 struct reg_cache *mips32_build_reg_cache(struct target *target)
248 {
249 /* get pointers to arch-specific information */
250 struct mips32_common *mips32 = target_to_mips32(target);
251
252 int num_regs = MIPS32NUMCOREREGS;
253 struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
254 struct reg_cache *cache = malloc(sizeof(struct reg_cache));
255 struct reg *reg_list = calloc(num_regs, sizeof(struct reg));
256 struct mips32_core_reg *arch_info = malloc(sizeof(struct mips32_core_reg) * num_regs);
257 int i;
258
259 register_init_dummy(&mips32_gdb_dummy_fp_reg);
260
261 /* Build the process context cache */
262 cache->name = "mips32 registers";
263 cache->next = NULL;
264 cache->reg_list = reg_list;
265 cache->num_regs = num_regs;
266 (*cache_p) = cache;
267 mips32->core_cache = cache;
268
269 for (i = 0; i < num_regs; i++) {
270 arch_info[i].num = mips32_regs[i].id;
271 arch_info[i].target = target;
272 arch_info[i].mips32_common = mips32;
273
274 reg_list[i].name = mips32_regs[i].name;
275 reg_list[i].size = 32;
276 reg_list[i].value = calloc(1, 4);
277 reg_list[i].dirty = 0;
278 reg_list[i].valid = 0;
279 reg_list[i].type = &mips32_reg_type;
280 reg_list[i].arch_info = &arch_info[i];
281 }
282
283 return cache;
284 }
285
286 int mips32_init_arch_info(struct target *target, struct mips32_common *mips32, struct jtag_tap *tap)
287 {
288 target->arch_info = mips32;
289 mips32->common_magic = MIPS32_COMMON_MAGIC;
290 mips32->fast_data_area = NULL;
291
292 /* has breakpoint/watchpoint unit been scanned */
293 mips32->bp_scanned = 0;
294 mips32->data_break_list = NULL;
295
296 mips32->ejtag_info.tap = tap;
297 mips32->read_core_reg = mips32_read_core_reg;
298 mips32->write_core_reg = mips32_write_core_reg;
299
300 mips32->ejtag_info.scan_delay = 2000000; /* Initial default value */
301 mips32->ejtag_info.mode = 0; /* Initial default value */
302
303 return ERROR_OK;
304 }
305
306 /* run to exit point. return error if exit point was not reached. */
307 static int mips32_run_and_wait(struct target *target, uint32_t entry_point,
308 int timeout_ms, uint32_t exit_point, struct mips32_common *mips32)
309 {
310 uint32_t pc;
311 int retval;
312 /* This code relies on the target specific resume() and poll()->debug_entry()
313 * sequence to write register values to the processor and the read them back */
314 retval = target_resume(target, 0, entry_point, 0, 1);
315 if (retval != ERROR_OK)
316 return retval;
317
318 retval = target_wait_state(target, TARGET_HALTED, timeout_ms);
319 /* If the target fails to halt due to the breakpoint, force a halt */
320 if (retval != ERROR_OK || target->state != TARGET_HALTED) {
321 retval = target_halt(target);
322 if (retval != ERROR_OK)
323 return retval;
324 retval = target_wait_state(target, TARGET_HALTED, 500);
325 if (retval != ERROR_OK)
326 return retval;
327 return ERROR_TARGET_TIMEOUT;
328 }
329
330 pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
331 if (exit_point && (pc != exit_point)) {
332 LOG_DEBUG("failed algorithm halted at 0x%" PRIx32 " ", pc);
333 return ERROR_TARGET_TIMEOUT;
334 }
335
336 return ERROR_OK;
337 }
338
339 int mips32_run_algorithm(struct target *target, int num_mem_params,
340 struct mem_param *mem_params, int num_reg_params,
341 struct reg_param *reg_params, uint32_t entry_point,
342 uint32_t exit_point, int timeout_ms, void *arch_info)
343 {
344 struct mips32_common *mips32 = target_to_mips32(target);
345 struct mips32_algorithm *mips32_algorithm_info = arch_info;
346 enum mips32_isa_mode isa_mode = mips32->isa_mode;
347
348 uint32_t context[MIPS32NUMCOREREGS];
349 int i;
350 int retval = ERROR_OK;
351
352 LOG_DEBUG("Running algorithm");
353
354 /* NOTE: mips32_run_algorithm requires that each algorithm uses a software breakpoint
355 * at the exit point */
356
357 if (mips32->common_magic != MIPS32_COMMON_MAGIC) {
358 LOG_ERROR("current target isn't a MIPS32 target");
359 return ERROR_TARGET_INVALID;
360 }
361
362 if (target->state != TARGET_HALTED) {
363 LOG_WARNING("target not halted");
364 return ERROR_TARGET_NOT_HALTED;
365 }
366
367 /* refresh core register cache */
368 for (i = 0; i < MIPS32NUMCOREREGS; i++) {
369 if (!mips32->core_cache->reg_list[i].valid)
370 mips32->read_core_reg(target, i);
371 context[i] = buf_get_u32(mips32->core_cache->reg_list[i].value, 0, 32);
372 }
373
374 for (i = 0; i < num_mem_params; i++) {
375 retval = target_write_buffer(target, mem_params[i].address,
376 mem_params[i].size, mem_params[i].value);
377 if (retval != ERROR_OK)
378 return retval;
379 }
380
381 for (i = 0; i < num_reg_params; i++) {
382 struct reg *reg = register_get_by_name(mips32->core_cache, reg_params[i].reg_name, 0);
383
384 if (!reg) {
385 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
386 return ERROR_COMMAND_SYNTAX_ERROR;
387 }
388
389 if (reg->size != reg_params[i].size) {
390 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
391 reg_params[i].reg_name);
392 return ERROR_COMMAND_SYNTAX_ERROR;
393 }
394
395 mips32_set_core_reg(reg, reg_params[i].value);
396 }
397
398 mips32->isa_mode = mips32_algorithm_info->isa_mode;
399
400 retval = mips32_run_and_wait(target, entry_point, timeout_ms, exit_point, mips32);
401
402 if (retval != ERROR_OK)
403 return retval;
404
405 for (i = 0; i < num_mem_params; i++) {
406 if (mem_params[i].direction != PARAM_OUT) {
407 retval = target_read_buffer(target, mem_params[i].address, mem_params[i].size,
408 mem_params[i].value);
409 if (retval != ERROR_OK)
410 return retval;
411 }
412 }
413
414 for (i = 0; i < num_reg_params; i++) {
415 if (reg_params[i].direction != PARAM_OUT) {
416 struct reg *reg = register_get_by_name(mips32->core_cache, reg_params[i].reg_name, 0);
417 if (!reg) {
418 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
419 return ERROR_COMMAND_SYNTAX_ERROR;
420 }
421
422 if (reg->size != reg_params[i].size) {
423 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
424 reg_params[i].reg_name);
425 return ERROR_COMMAND_SYNTAX_ERROR;
426 }
427
428 buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
429 }
430 }
431
432 /* restore everything we saved before */
433 for (i = 0; i < MIPS32NUMCOREREGS; i++) {
434 uint32_t regvalue;
435 regvalue = buf_get_u32(mips32->core_cache->reg_list[i].value, 0, 32);
436 if (regvalue != context[i]) {
437 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32,
438 mips32->core_cache->reg_list[i].name, context[i]);
439 buf_set_u32(mips32->core_cache->reg_list[i].value,
440 0, 32, context[i]);
441 mips32->core_cache->reg_list[i].valid = 1;
442 mips32->core_cache->reg_list[i].dirty = 1;
443 }
444 }
445
446 mips32->isa_mode = isa_mode;
447
448 return ERROR_OK;
449 }
450
451 int mips32_examine(struct target *target)
452 {
453 struct mips32_common *mips32 = target_to_mips32(target);
454
455 if (!target_was_examined(target)) {
456 target_set_examined(target);
457
458 /* we will configure later */
459 mips32->bp_scanned = 0;
460 mips32->num_inst_bpoints = 0;
461 mips32->num_data_bpoints = 0;
462 mips32->num_inst_bpoints_avail = 0;
463 mips32->num_data_bpoints_avail = 0;
464 }
465
466 return ERROR_OK;
467 }
468
469 static int mips32_configure_ibs(struct target *target)
470 {
471 struct mips32_common *mips32 = target_to_mips32(target);
472 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
473 int retval, i;
474 uint32_t bpinfo;
475
476 /* get number of inst breakpoints */
477 retval = target_read_u32(target, ejtag_info->ejtag_ibs_addr, &bpinfo);
478 if (retval != ERROR_OK)
479 return retval;
480
481 mips32->num_inst_bpoints = (bpinfo >> 24) & 0x0F;
482 mips32->num_inst_bpoints_avail = mips32->num_inst_bpoints;
483 mips32->inst_break_list = calloc(mips32->num_inst_bpoints,
484 sizeof(struct mips32_comparator));
485
486 for (i = 0; i < mips32->num_inst_bpoints; i++)
487 mips32->inst_break_list[i].reg_address =
488 ejtag_info->ejtag_iba0_addr +
489 (ejtag_info->ejtag_iba_step_size * i);
490
491 /* clear IBIS reg */
492 retval = target_write_u32(target, ejtag_info->ejtag_ibs_addr, 0);
493 return retval;
494 }
495
496 static int mips32_configure_dbs(struct target *target)
497 {
498 struct mips32_common *mips32 = target_to_mips32(target);
499 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
500 int retval, i;
501 uint32_t bpinfo;
502
503 /* get number of data breakpoints */
504 retval = target_read_u32(target, ejtag_info->ejtag_dbs_addr, &bpinfo);
505 if (retval != ERROR_OK)
506 return retval;
507
508 mips32->num_data_bpoints = (bpinfo >> 24) & 0x0F;
509 mips32->num_data_bpoints_avail = mips32->num_data_bpoints;
510 mips32->data_break_list = calloc(mips32->num_data_bpoints,
511 sizeof(struct mips32_comparator));
512
513 for (i = 0; i < mips32->num_data_bpoints; i++)
514 mips32->data_break_list[i].reg_address =
515 ejtag_info->ejtag_dba0_addr +
516 (ejtag_info->ejtag_dba_step_size * i);
517
518 /* clear DBIS reg */
519 retval = target_write_u32(target, ejtag_info->ejtag_dbs_addr, 0);
520 return retval;
521 }
522
523 int mips32_configure_break_unit(struct target *target)
524 {
525 /* get pointers to arch-specific information */
526 struct mips32_common *mips32 = target_to_mips32(target);
527 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
528 int retval;
529 uint32_t dcr;
530
531 if (mips32->bp_scanned)
532 return ERROR_OK;
533
534 /* get info about breakpoint support */
535 retval = target_read_u32(target, EJTAG_DCR, &dcr);
536 if (retval != ERROR_OK)
537 return retval;
538
539 /* EJTAG 2.0 defines IB and DB bits in IMP instead of DCR. */
540 if (ejtag_info->ejtag_version == EJTAG_VERSION_20) {
541 ejtag_info->debug_caps = dcr & EJTAG_DCR_ENM;
542 if (!(ejtag_info->impcode & EJTAG_V20_IMP_NOIB))
543 ejtag_info->debug_caps |= EJTAG_DCR_IB;
544 if (!(ejtag_info->impcode & EJTAG_V20_IMP_NODB))
545 ejtag_info->debug_caps |= EJTAG_DCR_DB;
546 } else
547 /* keep debug caps for later use */
548 ejtag_info->debug_caps = dcr & (EJTAG_DCR_ENM
549 | EJTAG_DCR_IB | EJTAG_DCR_DB);
550
551
552 if (ejtag_info->debug_caps & EJTAG_DCR_IB) {
553 retval = mips32_configure_ibs(target);
554 if (retval != ERROR_OK)
555 return retval;
556 }
557
558 if (ejtag_info->debug_caps & EJTAG_DCR_DB) {
559 retval = mips32_configure_dbs(target);
560 if (retval != ERROR_OK)
561 return retval;
562 }
563
564 /* check if target endianness settings matches debug control register */
565 if (((ejtag_info->debug_caps & EJTAG_DCR_ENM)
566 && (target->endianness == TARGET_LITTLE_ENDIAN)) ||
567 (!(ejtag_info->debug_caps & EJTAG_DCR_ENM)
568 && (target->endianness == TARGET_BIG_ENDIAN)))
569 LOG_WARNING("DCR endianness settings does not match target settings");
570
571 LOG_DEBUG("DCR 0x%" PRIx32 " numinst %i numdata %i", dcr, mips32->num_inst_bpoints,
572 mips32->num_data_bpoints);
573
574 mips32->bp_scanned = 1;
575
576 return ERROR_OK;
577 }
578
579 int mips32_enable_interrupts(struct target *target, int enable)
580 {
581 int retval;
582 int update = 0;
583 uint32_t dcr;
584
585 /* read debug control register */
586 retval = target_read_u32(target, EJTAG_DCR, &dcr);
587 if (retval != ERROR_OK)
588 return retval;
589
590 if (enable) {
591 if (!(dcr & EJTAG_DCR_INTE)) {
592 /* enable interrupts */
593 dcr |= EJTAG_DCR_INTE;
594 update = 1;
595 }
596 } else {
597 if (dcr & EJTAG_DCR_INTE) {
598 /* disable interrupts */
599 dcr &= ~EJTAG_DCR_INTE;
600 update = 1;
601 }
602 }
603
604 if (update) {
605 retval = target_write_u32(target, EJTAG_DCR, dcr);
606 if (retval != ERROR_OK)
607 return retval;
608 }
609
610 return ERROR_OK;
611 }
612
613 int mips32_checksum_memory(struct target *target, uint32_t address,
614 uint32_t count, uint32_t *checksum)
615 {
616 struct working_area *crc_algorithm;
617 struct reg_param reg_params[2];
618 struct mips32_algorithm mips32_info;
619
620 /* see contrib/loaders/checksum/mips32.s for src */
621
622 static const uint32_t mips_crc_code[] = {
623 0x248C0000, /* addiu $t4, $a0, 0 */
624 0x24AA0000, /* addiu $t2, $a1, 0 */
625 0x2404FFFF, /* addiu $a0, $zero, 0xffffffff */
626 0x10000010, /* beq $zero, $zero, ncomp */
627 0x240B0000, /* addiu $t3, $zero, 0 */
628 /* nbyte: */
629 0x81850000, /* lb $a1, ($t4) */
630 0x218C0001, /* addi $t4, $t4, 1 */
631 0x00052E00, /* sll $a1, $a1, 24 */
632 0x3C0204C1, /* lui $v0, 0x04c1 */
633 0x00852026, /* xor $a0, $a0, $a1 */
634 0x34471DB7, /* ori $a3, $v0, 0x1db7 */
635 0x00003021, /* addu $a2, $zero, $zero */
636 /* loop: */
637 0x00044040, /* sll $t0, $a0, 1 */
638 0x24C60001, /* addiu $a2, $a2, 1 */
639 0x28840000, /* slti $a0, $a0, 0 */
640 0x01074826, /* xor $t1, $t0, $a3 */
641 0x0124400B, /* movn $t0, $t1, $a0 */
642 0x28C30008, /* slti $v1, $a2, 8 */
643 0x1460FFF9, /* bne $v1, $zero, loop */
644 0x01002021, /* addu $a0, $t0, $zero */
645 /* ncomp: */
646 0x154BFFF0, /* bne $t2, $t3, nbyte */
647 0x256B0001, /* addiu $t3, $t3, 1 */
648 0x7000003F, /* sdbbp */
649 };
650
651 /* make sure we have a working area */
652 if (target_alloc_working_area(target, sizeof(mips_crc_code), &crc_algorithm) != ERROR_OK)
653 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
654
655 /* convert mips crc code into a buffer in target endianness */
656 uint8_t mips_crc_code_8[sizeof(mips_crc_code)];
657 target_buffer_set_u32_array(target, mips_crc_code_8,
658 ARRAY_SIZE(mips_crc_code), mips_crc_code);
659
660 target_write_buffer(target, crc_algorithm->address, sizeof(mips_crc_code), mips_crc_code_8);
661
662 mips32_info.common_magic = MIPS32_COMMON_MAGIC;
663 mips32_info.isa_mode = MIPS32_ISA_MIPS32;
664
665 init_reg_param(&reg_params[0], "a0", 32, PARAM_IN_OUT);
666 buf_set_u32(reg_params[0].value, 0, 32, address);
667
668 init_reg_param(&reg_params[1], "a1", 32, PARAM_OUT);
669 buf_set_u32(reg_params[1].value, 0, 32, count);
670
671 int timeout = 20000 * (1 + (count / (1024 * 1024)));
672
673 int retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
674 crc_algorithm->address, crc_algorithm->address + (sizeof(mips_crc_code) - 4), timeout,
675 &mips32_info);
676
677 if (retval == ERROR_OK)
678 *checksum = buf_get_u32(reg_params[0].value, 0, 32);
679
680 destroy_reg_param(&reg_params[0]);
681 destroy_reg_param(&reg_params[1]);
682
683 target_free_working_area(target, crc_algorithm);
684
685 return retval;
686 }
687
688 /** Checks whether a memory region is zeroed. */
689 int mips32_blank_check_memory(struct target *target,
690 uint32_t address, uint32_t count, uint32_t *blank)
691 {
692 struct working_area *erase_check_algorithm;
693 struct reg_param reg_params[3];
694 struct mips32_algorithm mips32_info;
695
696 static const uint32_t erase_check_code[] = {
697 /* nbyte: */
698 0x80880000, /* lb $t0, ($a0) */
699 0x00C83024, /* and $a2, $a2, $t0 */
700 0x24A5FFFF, /* addiu $a1, $a1, -1 */
701 0x14A0FFFC, /* bne $a1, $zero, nbyte */
702 0x24840001, /* addiu $a0, $a0, 1 */
703 0x7000003F /* sdbbp */
704 };
705
706 /* make sure we have a working area */
707 if (target_alloc_working_area(target, sizeof(erase_check_code), &erase_check_algorithm) != ERROR_OK)
708 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
709
710 /* convert erase check code into a buffer in target endianness */
711 uint8_t erase_check_code_8[sizeof(erase_check_code)];
712 target_buffer_set_u32_array(target, erase_check_code_8,
713 ARRAY_SIZE(erase_check_code), erase_check_code);
714
715 target_write_buffer(target, erase_check_algorithm->address, sizeof(erase_check_code), erase_check_code_8);
716
717 mips32_info.common_magic = MIPS32_COMMON_MAGIC;
718 mips32_info.isa_mode = MIPS32_ISA_MIPS32;
719
720 init_reg_param(&reg_params[0], "a0", 32, PARAM_OUT);
721 buf_set_u32(reg_params[0].value, 0, 32, address);
722
723 init_reg_param(&reg_params[1], "a1", 32, PARAM_OUT);
724 buf_set_u32(reg_params[1].value, 0, 32, count);
725
726 init_reg_param(&reg_params[2], "a2", 32, PARAM_IN_OUT);
727 buf_set_u32(reg_params[2].value, 0, 32, 0xff);
728
729 int retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
730 erase_check_algorithm->address,
731 erase_check_algorithm->address + (sizeof(erase_check_code) - 4),
732 10000, &mips32_info);
733
734 if (retval == ERROR_OK)
735 *blank = buf_get_u32(reg_params[2].value, 0, 32);
736
737 destroy_reg_param(&reg_params[0]);
738 destroy_reg_param(&reg_params[1]);
739 destroy_reg_param(&reg_params[2]);
740
741 target_free_working_area(target, erase_check_algorithm);
742
743 return retval;
744 }
745
746 static int mips32_verify_pointer(struct command_context *cmd_ctx,
747 struct mips32_common *mips32)
748 {
749 if (mips32->common_magic != MIPS32_COMMON_MAGIC) {
750 command_print(cmd_ctx, "target is not an MIPS32");
751 return ERROR_TARGET_INVALID;
752 }
753 return ERROR_OK;
754 }
755
756 /**
757 * MIPS32 targets expose command interface
758 * to manipulate CP0 registers
759 */
760 COMMAND_HANDLER(mips32_handle_cp0_command)
761 {
762 int retval;
763 struct target *target = get_current_target(CMD_CTX);
764 struct mips32_common *mips32 = target_to_mips32(target);
765 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
766
767
768 retval = mips32_verify_pointer(CMD_CTX, mips32);
769 if (retval != ERROR_OK)
770 return retval;
771
772 if (target->state != TARGET_HALTED) {
773 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
774 return ERROR_OK;
775 }
776
777 /* two or more argument, access a single register/select (write if third argument is given) */
778 if (CMD_ARGC < 2)
779 return ERROR_COMMAND_SYNTAX_ERROR;
780 else {
781 uint32_t cp0_reg, cp0_sel;
782 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], cp0_reg);
783 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], cp0_sel);
784
785 if (CMD_ARGC == 2) {
786 uint32_t value;
787
788 retval = mips32_cp0_read(ejtag_info, &value, cp0_reg, cp0_sel);
789 if (retval != ERROR_OK) {
790 command_print(CMD_CTX,
791 "couldn't access reg %" PRIi32,
792 cp0_reg);
793 return ERROR_OK;
794 }
795 command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
796 cp0_reg, cp0_sel, value);
797
798 } else if (CMD_ARGC == 3) {
799 uint32_t value;
800 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], value);
801 retval = mips32_cp0_write(ejtag_info, value, cp0_reg, cp0_sel);
802 if (retval != ERROR_OK) {
803 command_print(CMD_CTX,
804 "couldn't access cp0 reg %" PRIi32 ", select %" PRIi32,
805 cp0_reg, cp0_sel);
806 return ERROR_OK;
807 }
808 command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
809 cp0_reg, cp0_sel, value);
810 }
811 }
812
813 return ERROR_OK;
814 }
815
816 COMMAND_HANDLER(mips32_handle_scan_delay_command)
817 {
818 struct target *target = get_current_target(CMD_CTX);
819 struct mips32_common *mips32 = target_to_mips32(target);
820 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
821
822 if (CMD_ARGC == 1)
823 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], ejtag_info->scan_delay);
824 else if (CMD_ARGC > 1)
825 return ERROR_COMMAND_SYNTAX_ERROR;
826
827 command_print(CMD_CTX, "scan delay: %d nsec", ejtag_info->scan_delay);
828 if (ejtag_info->scan_delay >= 2000000) {
829 ejtag_info->mode = 0;
830 command_print(CMD_CTX, "running in legacy mode");
831 } else {
832 ejtag_info->mode = 1;
833 command_print(CMD_CTX, "running in fast queued mode");
834 }
835
836 return ERROR_OK;
837 }
838
839 static const struct command_registration mips32_exec_command_handlers[] = {
840 {
841 .name = "cp0",
842 .handler = mips32_handle_cp0_command,
843 .mode = COMMAND_EXEC,
844 .usage = "regnum select [value]",
845 .help = "display/modify cp0 register",
846 },
847 {
848 .name = "scan_delay",
849 .handler = mips32_handle_scan_delay_command,
850 .mode = COMMAND_ANY,
851 .help = "display/set scan delay in nano seconds",
852 .usage = "[value]",
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 .usage = "",
863 .chain = mips32_exec_command_handlers,
864 },
865 COMMAND_REGISTRATION_DONE
866 };

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