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PIC32: add software reset support
[openocd/dnglaze.git] / src / target / mips_m4k.c
blobd1b458914b4a4725d696d38db9ed7f1ae675bd7a
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) 2009 by David N. Claffey <dnclaffey@gmail.com> *
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 * This program is distributed in the hope that it will be useful, *
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
17 * GNU General Public License for more details. *
18 * *
19 * You should have received a copy of the GNU General Public License *
20 * along with this program; if not, write to the *
21 * Free Software Foundation, Inc., *
22 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
23 ***************************************************************************/
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27
28 #include "breakpoints.h"
29 #include "mips32.h"
30 #include "mips_m4k.h"
31 #include "mips32_dmaacc.h"
32 #include "target_type.h"
33 #include "register.h"
34
35 int mips_m4k_examine_debug_reason(struct target *target)
36 {
37 uint32_t break_status;
38 int retval;
39
40 if ((target->debug_reason != DBG_REASON_DBGRQ)
41 && (target->debug_reason != DBG_REASON_SINGLESTEP))
42 {
43 /* get info about inst breakpoint support */
44 if ((retval = target_read_u32(target, EJTAG_IBS, &break_status)) != ERROR_OK)
45 return retval;
46 if (break_status & 0x1f)
47 {
48 /* we have halted on a breakpoint */
49 if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
50 return retval;
51 target->debug_reason = DBG_REASON_BREAKPOINT;
52 }
53
54 /* get info about data breakpoint support */
55 if ((retval = target_read_u32(target, EJTAG_DBS, &break_status)) != ERROR_OK)
56 return retval;
57 if (break_status & 0x1f)
58 {
59 /* we have halted on a breakpoint */
60 if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
61 return retval;
62 target->debug_reason = DBG_REASON_WATCHPOINT;
63 }
64 }
65
66 return ERROR_OK;
67 }
68
69 int mips_m4k_debug_entry(struct target *target)
70 {
71 struct mips32_common *mips32 = target_to_mips32(target);
72 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
73 uint32_t debug_reg;
74
75 /* read debug register */
76 mips_ejtag_read_debug(ejtag_info, &debug_reg);
77
78 /* make sure break unit configured */
79 mips32_configure_break_unit(target);
80
81 /* attempt to find halt reason */
82 mips_m4k_examine_debug_reason(target);
83
84 /* clear single step if active */
85 if (debug_reg & EJTAG_DEBUG_DSS)
86 {
87 /* stopped due to single step - clear step bit */
88 mips_ejtag_config_step(ejtag_info, 0);
89 }
90
91 mips32_save_context(target);
92
93 /* default to mips32 isa, it will be changed below if required */
94 mips32->isa_mode = MIPS32_ISA_MIPS32;
95
96 if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
97 mips32->isa_mode = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1);
98 }
99
100 LOG_DEBUG("entered debug state at PC 0x%" PRIx32 ", target->state: %s",
101 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32),
102 target_state_name(target));
103
104 return ERROR_OK;
105 }
106
107 int mips_m4k_poll(struct target *target)
108 {
109 int retval;
110 struct mips32_common *mips32 = target_to_mips32(target);
111 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
112 uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl;
113
114 /* read ejtag control reg */
115 jtag_set_end_state(TAP_IDLE);
116 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
117 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
118
119 /* clear this bit before handling polling
120 * as after reset registers will read zero */
121 if (ejtag_ctrl & EJTAG_CTRL_ROCC)
122 {
123 /* we have detected a reset, clear flag
124 * otherwise ejtag will not work */
125 jtag_set_end_state(TAP_IDLE);
126 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_ROCC;
127
128 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
129 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
130 LOG_DEBUG("Reset Detected");
131 }
132
133 /* check for processor halted */
134 if (ejtag_ctrl & EJTAG_CTRL_BRKST)
135 {
136 if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
137 {
138 jtag_set_end_state(TAP_IDLE);
139 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT, NULL);
140
141 target->state = TARGET_HALTED;
142
143 if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
144 return retval;
145
146 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
147 }
148 else if (target->state == TARGET_DEBUG_RUNNING)
149 {
150 target->state = TARGET_HALTED;
151
152 if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
153 return retval;
154
155 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
156 }
157 }
158 else
159 {
160 target->state = TARGET_RUNNING;
161 }
162
163 // LOG_DEBUG("ctrl = 0x%08X", ejtag_ctrl);
164
165 return ERROR_OK;
166 }
167
168 int mips_m4k_halt(struct target *target)
169 {
170 struct mips32_common *mips32 = target_to_mips32(target);
171 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
172
173 LOG_DEBUG("target->state: %s",
174 target_state_name(target));
175
176 if (target->state == TARGET_HALTED)
177 {
178 LOG_DEBUG("target was already halted");
179 return ERROR_OK;
180 }
181
182 if (target->state == TARGET_UNKNOWN)
183 {
184 LOG_WARNING("target was in unknown state when halt was requested");
185 }
186
187 if (target->state == TARGET_RESET)
188 {
189 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst())
190 {
191 LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
192 return ERROR_TARGET_FAILURE;
193 }
194 else
195 {
196 /* we came here in a reset_halt or reset_init sequence
197 * debug entry was already prepared in mips32_prepare_reset_halt()
198 */
199 target->debug_reason = DBG_REASON_DBGRQ;
200
201 return ERROR_OK;
202 }
203 }
204
205 /* break processor */
206 mips_ejtag_enter_debug(ejtag_info);
207
208 target->debug_reason = DBG_REASON_DBGRQ;
209
210 return ERROR_OK;
211 }
212
213 int mips_m4k_assert_reset(struct target *target)
214 {
215 struct mips_m4k_common *mips_m4k = target_to_m4k(target);
216 struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
217 int assert_srst = 1;
218
219 LOG_DEBUG("target->state: %s",
220 target_state_name(target));
221
222 enum reset_types jtag_reset_config = jtag_get_reset_config();
223
224 if (!(jtag_reset_config & RESET_HAS_SRST))
225 assert_srst = 0;
226
227 if (target->reset_halt)
228 {
229 /* use hardware to catch reset */
230 jtag_set_end_state(TAP_IDLE);
231 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT, NULL);
232 }
233 else
234 {
235 jtag_set_end_state(TAP_IDLE);
236 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT, NULL);
237 }
238
239 if (assert_srst)
240 {
241 /* here we should issue a srst only, but we may have to assert trst as well */
242 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
243 {
244 jtag_add_reset(1, 1);
245 }
246 else
247 {
248 jtag_add_reset(0, 1);
249 }
250 }
251 else
252 {
253 if (mips_m4k->is_pic32mx)
254 {
255 uint32_t mchip_cmd;
256
257 LOG_DEBUG("Using MTAP reset to reset processor...");
258
259 /* use microchip specific MTAP reset */
260 mips_ejtag_set_instr(ejtag_info, MTAP_SW_MTAP, NULL);
261 mips_ejtag_set_instr(ejtag_info, MTAP_COMMAND, NULL);
262
263 mchip_cmd = MCHP_ASERT_RST;
264 mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
265 mchip_cmd = MCHP_DE_ASSERT_RST;
266 mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
267 mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP, NULL);
268 }
269 else
270 {
271 /* use ejtag reset - not supported by all cores */
272 uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_PRRST | EJTAG_CTRL_PERRST;
273 LOG_DEBUG("Using EJTAG reset (PRRST) to reset processor...");
274 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
275 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
276 }
277 }
278
279 target->state = TARGET_RESET;
280 jtag_add_sleep(50000);
281
282 register_cache_invalidate(mips_m4k->mips32.core_cache);
283
284 if (target->reset_halt)
285 {
286 int retval;
287 if ((retval = target_halt(target)) != ERROR_OK)
288 return retval;
289 }
290
291 return ERROR_OK;
292 }
293
294 int mips_m4k_deassert_reset(struct target *target)
295 {
296 LOG_DEBUG("target->state: %s",
297 target_state_name(target));
298
299 /* deassert reset lines */
300 jtag_add_reset(0, 0);
301
302 return ERROR_OK;
303 }
304
305 int mips_m4k_soft_reset_halt(struct target *target)
306 {
307 /* TODO */
308 return ERROR_OK;
309 }
310
311 int mips_m4k_single_step_core(struct target *target)
312 {
313 struct mips32_common *mips32 = target_to_mips32(target);
314 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
315
316 /* configure single step mode */
317 mips_ejtag_config_step(ejtag_info, 1);
318
319 /* disable interrupts while stepping */
320 mips32_enable_interrupts(target, 0);
321
322 /* exit debug mode */
323 mips_ejtag_exit_debug(ejtag_info);
324
325 mips_m4k_debug_entry(target);
326
327 return ERROR_OK;
328 }
329
330 int mips_m4k_resume(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution)
331 {
332 struct mips32_common *mips32 = target_to_mips32(target);
333 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
334 struct breakpoint *breakpoint = NULL;
335 uint32_t resume_pc;
336
337 if (target->state != TARGET_HALTED)
338 {
339 LOG_WARNING("target not halted");
340 return ERROR_TARGET_NOT_HALTED;
341 }
342
343 if (!debug_execution)
344 {
345 target_free_all_working_areas(target);
346 mips_m4k_enable_breakpoints(target);
347 mips_m4k_enable_watchpoints(target);
348 }
349
350 /* current = 1: continue on current pc, otherwise continue at <address> */
351 if (!current)
352 {
353 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
354 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
355 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
356 }
357
358 if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
359 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1, mips32->isa_mode);
360 }
361
362 resume_pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
363
364 mips32_restore_context(target);
365
366 /* the front-end may request us not to handle breakpoints */
367 if (handle_breakpoints)
368 {
369 /* Single step past breakpoint at current address */
370 if ((breakpoint = breakpoint_find(target, resume_pc)))
371 {
372 LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 "", breakpoint->address);
373 mips_m4k_unset_breakpoint(target, breakpoint);
374 mips_m4k_single_step_core(target);
375 mips_m4k_set_breakpoint(target, breakpoint);
376 }
377 }
378
379 /* enable interrupts if we are running */
380 mips32_enable_interrupts(target, !debug_execution);
381
382 /* exit debug mode */
383 mips_ejtag_exit_debug(ejtag_info);
384 target->debug_reason = DBG_REASON_NOTHALTED;
385
386 /* registers are now invalid */
387 register_cache_invalidate(mips32->core_cache);
388
389 if (!debug_execution)
390 {
391 target->state = TARGET_RUNNING;
392 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
393 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
394 }
395 else
396 {
397 target->state = TARGET_DEBUG_RUNNING;
398 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
399 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
400 }
401
402 return ERROR_OK;
403 }
404
405 int mips_m4k_step(struct target *target, int current, uint32_t address, int handle_breakpoints)
406 {
407 /* get pointers to arch-specific information */
408 struct mips32_common *mips32 = target_to_mips32(target);
409 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
410 struct breakpoint *breakpoint = NULL;
411
412 if (target->state != TARGET_HALTED)
413 {
414 LOG_WARNING("target not halted");
415 return ERROR_TARGET_NOT_HALTED;
416 }
417
418 /* current = 1: continue on current pc, otherwise continue at <address> */
419 if (!current)
420 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
421
422 /* the front-end may request us not to handle breakpoints */
423 if (handle_breakpoints) {
424 breakpoint = breakpoint_find(target,
425 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
426 if (breakpoint)
427 mips_m4k_unset_breakpoint(target, breakpoint);
428 }
429
430 /* restore context */
431 mips32_restore_context(target);
432
433 /* configure single step mode */
434 mips_ejtag_config_step(ejtag_info, 1);
435
436 target->debug_reason = DBG_REASON_SINGLESTEP;
437
438 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
439
440 /* disable interrupts while stepping */
441 mips32_enable_interrupts(target, 0);
442
443 /* exit debug mode */
444 mips_ejtag_exit_debug(ejtag_info);
445
446 /* registers are now invalid */
447 register_cache_invalidate(mips32->core_cache);
448
449 if (breakpoint)
450 mips_m4k_set_breakpoint(target, breakpoint);
451
452 LOG_DEBUG("target stepped ");
453
454 mips_m4k_debug_entry(target);
455 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
456
457 return ERROR_OK;
458 }
459
460 void mips_m4k_enable_breakpoints(struct target *target)
461 {
462 struct breakpoint *breakpoint = target->breakpoints;
463
464 /* set any pending breakpoints */
465 while (breakpoint)
466 {
467 if (breakpoint->set == 0)
468 mips_m4k_set_breakpoint(target, breakpoint);
469 breakpoint = breakpoint->next;
470 }
471 }
472
473 int mips_m4k_set_breakpoint(struct target *target, struct breakpoint *breakpoint)
474 {
475 struct mips32_common *mips32 = target_to_mips32(target);
476 struct mips32_comparator * comparator_list = mips32->inst_break_list;
477 int retval;
478
479 if (breakpoint->set)
480 {
481 LOG_WARNING("breakpoint already set");
482 return ERROR_OK;
483 }
484
485 if (breakpoint->type == BKPT_HARD)
486 {
487 int bp_num = 0;
488
489 while (comparator_list[bp_num].used && (bp_num < mips32->num_inst_bpoints))
490 bp_num++;
491 if (bp_num >= mips32->num_inst_bpoints)
492 {
493 LOG_ERROR("Can not find free FP Comparator(bpid: %d)",
494 breakpoint->unique_id );
495 return ERROR_FAIL;
496 }
497 breakpoint->set = bp_num + 1;
498 comparator_list[bp_num].used = 1;
499 comparator_list[bp_num].bp_value = breakpoint->address;
500 target_write_u32(target, comparator_list[bp_num].reg_address, comparator_list[bp_num].bp_value);
501 target_write_u32(target, comparator_list[bp_num].reg_address + 0x08, 0x00000000);
502 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 1);
503 LOG_DEBUG("bpid: %d, bp_num %i bp_value 0x%" PRIx32 "",
504 breakpoint->unique_id,
505 bp_num, comparator_list[bp_num].bp_value);
506 }
507 else if (breakpoint->type == BKPT_SOFT)
508 {
509 LOG_DEBUG("bpid: %d", breakpoint->unique_id );
510 if (breakpoint->length == 4)
511 {
512 uint32_t verify = 0xffffffff;
513
514 if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
515 breakpoint->orig_instr)) != ERROR_OK)
516 {
517 return retval;
518 }
519 if ((retval = target_write_u32(target, breakpoint->address, MIPS32_SDBBP)) != ERROR_OK)
520 {
521 return retval;
522 }
523
524 if ((retval = target_read_u32(target, breakpoint->address, &verify)) != ERROR_OK)
525 {
526 return retval;
527 }
528 if (verify != MIPS32_SDBBP)
529 {
530 LOG_ERROR("Unable to set 32bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
531 return ERROR_OK;
532 }
533 }
534 else
535 {
536 uint16_t verify = 0xffff;
537
538 if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
539 breakpoint->orig_instr)) != ERROR_OK)
540 {
541 return retval;
542 }
543 if ((retval = target_write_u16(target, breakpoint->address, MIPS16_SDBBP)) != ERROR_OK)
544 {
545 return retval;
546 }
547
548 if ((retval = target_read_u16(target, breakpoint->address, &verify)) != ERROR_OK)
549 {
550 return retval;
551 }
552 if (verify != MIPS16_SDBBP)
553 {
554 LOG_ERROR("Unable to set 16bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
555 return ERROR_OK;
556 }
557 }
558
559 breakpoint->set = 20; /* Any nice value but 0 */
560 }
561
562 return ERROR_OK;
563 }
564
565 int mips_m4k_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
566 {
567 /* get pointers to arch-specific information */
568 struct mips32_common *mips32 = target_to_mips32(target);
569 struct mips32_comparator *comparator_list = mips32->inst_break_list;
570 int retval;
571
572 if (!breakpoint->set)
573 {
574 LOG_WARNING("breakpoint not set");
575 return ERROR_OK;
576 }
577
578 if (breakpoint->type == BKPT_HARD)
579 {
580 int bp_num = breakpoint->set - 1;
581 if ((bp_num < 0) || (bp_num >= mips32->num_inst_bpoints))
582 {
583 LOG_DEBUG("Invalid FP Comparator number in breakpoint (bpid: %d)",
584 breakpoint->unique_id);
585 return ERROR_OK;
586 }
587 LOG_DEBUG("bpid: %d - releasing hw: %d",
588 breakpoint->unique_id,
589 bp_num );
590 comparator_list[bp_num].used = 0;
591 comparator_list[bp_num].bp_value = 0;
592 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 0);
593
594 }
595 else
596 {
597 /* restore original instruction (kept in target endianness) */
598 LOG_DEBUG("bpid: %d", breakpoint->unique_id);
599 if (breakpoint->length == 4)
600 {
601 uint32_t current_instr;
602
603 /* check that user program has not modified breakpoint instruction */
604 if ((retval = target_read_memory(target, breakpoint->address, 4, 1,
605 (uint8_t*)&current_instr)) != ERROR_OK)
606 {
607 return retval;
608 }
609 if (current_instr == MIPS32_SDBBP)
610 {
611 if ((retval = target_write_memory(target, breakpoint->address, 4, 1,
612 breakpoint->orig_instr)) != ERROR_OK)
613 {
614 return retval;
615 }
616 }
617 }
618 else
619 {
620 uint16_t current_instr;
621
622 /* check that user program has not modified breakpoint instruction */
623 if ((retval = target_read_memory(target, breakpoint->address, 2, 1,
624 (uint8_t*)&current_instr)) != ERROR_OK)
625 {
626 return retval;
627 }
628
629 if (current_instr == MIPS16_SDBBP)
630 {
631 if ((retval = target_write_memory(target, breakpoint->address, 2, 1,
632 breakpoint->orig_instr)) != ERROR_OK)
633 {
634 return retval;
635 }
636 }
637 }
638 }
639 breakpoint->set = 0;
640
641 return ERROR_OK;
642 }
643
644 int mips_m4k_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
645 {
646 struct mips32_common *mips32 = target_to_mips32(target);
647
648 if (breakpoint->type == BKPT_HARD)
649 {
650 if (mips32->num_inst_bpoints_avail < 1)
651 {
652 LOG_INFO("no hardware breakpoint available");
653 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
654 }
655
656 mips32->num_inst_bpoints_avail--;
657 }
658
659 mips_m4k_set_breakpoint(target, breakpoint);
660
661 return ERROR_OK;
662 }
663
664 int mips_m4k_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
665 {
666 /* get pointers to arch-specific information */
667 struct mips32_common *mips32 = target_to_mips32(target);
668
669 if (target->state != TARGET_HALTED)
670 {
671 LOG_WARNING("target not halted");
672 return ERROR_TARGET_NOT_HALTED;
673 }
674
675 if (breakpoint->set)
676 {
677 mips_m4k_unset_breakpoint(target, breakpoint);
678 }
679
680 if (breakpoint->type == BKPT_HARD)
681 mips32->num_inst_bpoints_avail++;
682
683 return ERROR_OK;
684 }
685
686 int mips_m4k_set_watchpoint(struct target *target, struct watchpoint *watchpoint)
687 {
688 struct mips32_common *mips32 = target_to_mips32(target);
689 struct mips32_comparator *comparator_list = mips32->data_break_list;
690 int wp_num = 0;
691 /*
692 * watchpoint enabled, ignore all byte lanes in value register
693 * and exclude both load and store accesses from watchpoint
694 * condition evaluation
695 */
696 int enable = EJTAG_DBCn_NOSB | EJTAG_DBCn_NOLB | EJTAG_DBCn_BE |
697 (0xff << EJTAG_DBCn_BLM_SHIFT);
698
699 if (watchpoint->set)
700 {
701 LOG_WARNING("watchpoint already set");
702 return ERROR_OK;
703 }
704
705 while(comparator_list[wp_num].used && (wp_num < mips32->num_data_bpoints))
706 wp_num++;
707 if (wp_num >= mips32->num_data_bpoints)
708 {
709 LOG_ERROR("Can not find free FP Comparator");
710 return ERROR_FAIL;
711 }
712
713 if (watchpoint->length != 4)
714 {
715 LOG_ERROR("Only watchpoints of length 4 are supported");
716 return ERROR_TARGET_UNALIGNED_ACCESS;
717 }
718
719 if (watchpoint->address % 4)
720 {
721 LOG_ERROR("Watchpoints address should be word aligned");
722 return ERROR_TARGET_UNALIGNED_ACCESS;
723 }
724
725 switch (watchpoint->rw)
726 {
727 case WPT_READ:
728 enable &= ~EJTAG_DBCn_NOLB;
729 break;
730 case WPT_WRITE:
731 enable &= ~EJTAG_DBCn_NOSB;
732 break;
733 case WPT_ACCESS:
734 enable &= ~(EJTAG_DBCn_NOLB | EJTAG_DBCn_NOSB);
735 break;
736 default:
737 LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
738 }
739
740 watchpoint->set = wp_num + 1;
741 comparator_list[wp_num].used = 1;
742 comparator_list[wp_num].bp_value = watchpoint->address;
743 target_write_u32(target, comparator_list[wp_num].reg_address, comparator_list[wp_num].bp_value);
744 target_write_u32(target, comparator_list[wp_num].reg_address + 0x08, 0x00000000);
745 target_write_u32(target, comparator_list[wp_num].reg_address + 0x10, 0x00000000);
746 target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, enable);
747 target_write_u32(target, comparator_list[wp_num].reg_address + 0x20, 0);
748 LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "", wp_num, comparator_list[wp_num].bp_value);
749
750 return ERROR_OK;
751 }
752
753 int mips_m4k_unset_watchpoint(struct target *target, struct watchpoint *watchpoint)
754 {
755 /* get pointers to arch-specific information */
756 struct mips32_common *mips32 = target_to_mips32(target);
757 struct mips32_comparator *comparator_list = mips32->data_break_list;
758
759 if (!watchpoint->set)
760 {
761 LOG_WARNING("watchpoint not set");
762 return ERROR_OK;
763 }
764
765 int wp_num = watchpoint->set - 1;
766 if ((wp_num < 0) || (wp_num >= mips32->num_data_bpoints))
767 {
768 LOG_DEBUG("Invalid FP Comparator number in watchpoint");
769 return ERROR_OK;
770 }
771 comparator_list[wp_num].used = 0;
772 comparator_list[wp_num].bp_value = 0;
773 target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, 0);
774 watchpoint->set = 0;
775
776 return ERROR_OK;
777 }
778
779 int mips_m4k_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
780 {
781 struct mips32_common *mips32 = target_to_mips32(target);
782
783 if (mips32->num_data_bpoints_avail < 1)
784 {
785 LOG_INFO("no hardware watchpoints available");
786 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
787 }
788
789 mips32->num_data_bpoints_avail--;
790
791 mips_m4k_set_watchpoint(target, watchpoint);
792 return ERROR_OK;
793 }
794
795 int mips_m4k_remove_watchpoint(struct target *target, struct watchpoint *watchpoint)
796 {
797 /* get pointers to arch-specific information */
798 struct mips32_common *mips32 = target_to_mips32(target);
799
800 if (target->state != TARGET_HALTED)
801 {
802 LOG_WARNING("target not halted");
803 return ERROR_TARGET_NOT_HALTED;
804 }
805
806 if (watchpoint->set)
807 {
808 mips_m4k_unset_watchpoint(target, watchpoint);
809 }
810
811 mips32->num_data_bpoints_avail++;
812
813 return ERROR_OK;
814 }
815
816 void mips_m4k_enable_watchpoints(struct target *target)
817 {
818 struct watchpoint *watchpoint = target->watchpoints;
819
820 /* set any pending watchpoints */
821 while (watchpoint)
822 {
823 if (watchpoint->set == 0)
824 mips_m4k_set_watchpoint(target, watchpoint);
825 watchpoint = watchpoint->next;
826 }
827 }
828
829 int mips_m4k_read_memory(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
830 {
831 struct mips32_common *mips32 = target_to_mips32(target);
832 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
833
834 LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, size, count);
835
836 if (target->state != TARGET_HALTED)
837 {
838 LOG_WARNING("target not halted");
839 return ERROR_TARGET_NOT_HALTED;
840 }
841
842 /* sanitize arguments */
843 if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
844 return ERROR_INVALID_ARGUMENTS;
845
846 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
847 return ERROR_TARGET_UNALIGNED_ACCESS;
848
849 /* if noDMA off, use DMAACC mode for memory read */
850 int retval;
851 if (ejtag_info->impcode & EJTAG_IMP_NODMA)
852 retval = mips32_pracc_read_mem(ejtag_info, address, size, count, (void *)buffer);
853 else
854 retval = mips32_dmaacc_read_mem(ejtag_info, address, size, count, (void *)buffer);
855 if (ERROR_OK != retval)
856 return retval;
857
858 return ERROR_OK;
859 }
860
861 int mips_m4k_write_memory(struct target *target, uint32_t address, uint32_t size,
862 uint32_t count, uint8_t *buffer)
863 {
864 struct mips32_common *mips32 = target_to_mips32(target);
865 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
866
867 LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "",
868 address, size, count);
869
870 if (target->state != TARGET_HALTED)
871 {
872 LOG_WARNING("target not halted");
873 return ERROR_TARGET_NOT_HALTED;
874 }
875
876 /* sanitize arguments */
877 if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
878 return ERROR_INVALID_ARGUMENTS;
879
880 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
881 return ERROR_TARGET_UNALIGNED_ACCESS;
882
883 /* if noDMA off, use DMAACC mode for memory write */
884 if (ejtag_info->impcode & EJTAG_IMP_NODMA)
885 return mips32_pracc_write_mem(ejtag_info, address, size, count, (void *)buffer);
886 else
887 return mips32_dmaacc_write_mem(ejtag_info, address, size, count, (void *)buffer);
888 }
889
890 int mips_m4k_init_target(struct command_context *cmd_ctx, struct target *target)
891 {
892 mips32_build_reg_cache(target);
893
894 return ERROR_OK;
895 }
896
897 int mips_m4k_init_arch_info(struct target *target, struct mips_m4k_common *mips_m4k,
898 struct jtag_tap *tap)
899 {
900 struct mips32_common *mips32 = &mips_m4k->mips32;
901
902 mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
903
904 /* initialize mips4k specific info */
905 mips32_init_arch_info(target, mips32, tap);
906 mips32->arch_info = mips_m4k;
907
908 return ERROR_OK;
909 }
910
911 int mips_m4k_target_create(struct target *target, Jim_Interp *interp)
912 {
913 struct mips_m4k_common *mips_m4k = calloc(1, sizeof(struct mips_m4k_common));
914
915 mips_m4k_init_arch_info(target, mips_m4k, target->tap);
916
917 return ERROR_OK;
918 }
919
920 int mips_m4k_examine(struct target *target)
921 {
922 int retval;
923 struct mips_m4k_common *mips_m4k = target_to_m4k(target);
924 struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
925 uint32_t idcode = 0;
926
927 if (!target_was_examined(target))
928 {
929 mips_ejtag_get_idcode(ejtag_info, &idcode);
930 ejtag_info->idcode = idcode;
931
932 if (((idcode >> 1) & 0x7FF) == 0x29)
933 {
934 /* we are using a pic32mx so select ejtag port
935 * as it is not selected by default */
936 mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP, NULL);
937 LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
938 mips_m4k->is_pic32mx = true;
939 }
940 }
941
942 /* init rest of ejtag interface */
943 if ((retval = mips_ejtag_init(ejtag_info)) != ERROR_OK)
944 return retval;
945
946 if ((retval = mips32_examine(target)) != ERROR_OK)
947 return retval;
948
949 return ERROR_OK;
950 }
951
952 int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
953 uint32_t count, uint8_t *buffer)
954 {
955 struct mips32_common *mips32 = target_to_mips32(target);
956 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
957 struct working_area *source;
958 int retval;
959 int write = 1;
960
961 LOG_DEBUG("address: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, count);
962
963 if (target->state != TARGET_HALTED)
964 {
965 LOG_WARNING("target not halted");
966 return ERROR_TARGET_NOT_HALTED;
967 }
968
969 /* check alignment */
970 if (address & 0x3u)
971 return ERROR_TARGET_UNALIGNED_ACCESS;
972
973 /* Get memory for block write handler */
974 retval = target_alloc_working_area(target, MIPS32_FASTDATA_HANDLER_SIZE, &source);
975 if (retval != ERROR_OK)
976 {
977 LOG_WARNING("No working area available, falling back to non-bulk write");
978 return mips_m4k_write_memory(target, address, 4, count, buffer);
979 }
980
981 /* TAP data register is loaded LSB first (little endian) */
982 if (target->endianness == TARGET_BIG_ENDIAN)
983 {
984 uint32_t i, t32;
985 for(i = 0; i < (count * 4); i += 4)
986 {
987 t32 = be_to_h_u32((uint8_t *) &buffer[i]);
988 h_u32_to_le(&buffer[i], t32);
989 }
990 }
991
992 retval = mips32_pracc_fastdata_xfer(ejtag_info, source, write, address,
993 count, (uint32_t*) buffer);
994 if (retval != ERROR_OK)
995 {
996 /* FASTDATA access failed, try normal memory write */
997 LOG_DEBUG("Fastdata access Failed, falling back to non-bulk write");
998 retval = mips_m4k_write_memory(target, address, 4, count, buffer);
999 }
1000
1001 if (source)
1002 target_free_working_area(target, source);
1003
1004 return retval;
1005 }
1006
1007 struct target_type mips_m4k_target =
1008 {
1009 .name = "mips_m4k",
1010
1011 .poll = mips_m4k_poll,
1012 .arch_state = mips32_arch_state,
1013
1014 .target_request_data = NULL,
1015
1016 .halt = mips_m4k_halt,
1017 .resume = mips_m4k_resume,
1018 .step = mips_m4k_step,
1019
1020 .assert_reset = mips_m4k_assert_reset,
1021 .deassert_reset = mips_m4k_deassert_reset,
1022 .soft_reset_halt = mips_m4k_soft_reset_halt,
1023
1024 .get_gdb_reg_list = mips32_get_gdb_reg_list,
1025
1026 .read_memory = mips_m4k_read_memory,
1027 .write_memory = mips_m4k_write_memory,
1028 .bulk_write_memory = mips_m4k_bulk_write_memory,
1029 .checksum_memory = mips32_checksum_memory,
1030 .blank_check_memory = mips32_blank_check_memory,
1031
1032 .run_algorithm = mips32_run_algorithm,
1033
1034 .add_breakpoint = mips_m4k_add_breakpoint,
1035 .remove_breakpoint = mips_m4k_remove_breakpoint,
1036 .add_watchpoint = mips_m4k_add_watchpoint,
1037 .remove_watchpoint = mips_m4k_remove_watchpoint,
1038
1039 .target_create = mips_m4k_target_create,
1040 .init_target = mips_m4k_init_target,
1041 .examine = mips_m4k_examine,
1042 };
Unoffical Testing Grounds for Dean Glazeski