mips: mips_ejtag_get_impcode error propagation added
[openocd.git] / src / target / mips_m4k.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) 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 static void mips_m4k_enable_breakpoints(struct target *target);
36 static void mips_m4k_enable_watchpoints(struct target *target);
37 static int mips_m4k_set_breakpoint(struct target *target,
38 struct breakpoint *breakpoint);
39 static int mips_m4k_unset_breakpoint(struct target *target,
40 struct breakpoint *breakpoint);
41
42 static int mips_m4k_examine_debug_reason(struct target *target)
43 {
44 uint32_t break_status;
45 int retval;
46
47 if ((target->debug_reason != DBG_REASON_DBGRQ)
48 && (target->debug_reason != DBG_REASON_SINGLESTEP))
49 {
50 /* get info about inst breakpoint support */
51 if ((retval = target_read_u32(target, EJTAG_IBS, &break_status)) != ERROR_OK)
52 return retval;
53 if (break_status & 0x1f)
54 {
55 /* we have halted on a breakpoint */
56 if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
57 return retval;
58 target->debug_reason = DBG_REASON_BREAKPOINT;
59 }
60
61 /* get info about data breakpoint support */
62 if ((retval = target_read_u32(target, EJTAG_DBS, &break_status)) != ERROR_OK)
63 return retval;
64 if (break_status & 0x1f)
65 {
66 /* we have halted on a breakpoint */
67 if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
68 return retval;
69 target->debug_reason = DBG_REASON_WATCHPOINT;
70 }
71 }
72
73 return ERROR_OK;
74 }
75
76 static int mips_m4k_debug_entry(struct target *target)
77 {
78 struct mips32_common *mips32 = target_to_mips32(target);
79 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
80 uint32_t debug_reg;
81
82 /* read debug register */
83 mips_ejtag_read_debug(ejtag_info, &debug_reg);
84
85 /* make sure break unit configured */
86 mips32_configure_break_unit(target);
87
88 /* attempt to find halt reason */
89 mips_m4k_examine_debug_reason(target);
90
91 /* clear single step if active */
92 if (debug_reg & EJTAG_DEBUG_DSS)
93 {
94 /* stopped due to single step - clear step bit */
95 mips_ejtag_config_step(ejtag_info, 0);
96 }
97
98 mips32_save_context(target);
99
100 /* default to mips32 isa, it will be changed below if required */
101 mips32->isa_mode = MIPS32_ISA_MIPS32;
102
103 if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
104 mips32->isa_mode = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1);
105 }
106
107 LOG_DEBUG("entered debug state at PC 0x%" PRIx32 ", target->state: %s",
108 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32),
109 target_state_name(target));
110
111 return ERROR_OK;
112 }
113
114 static int mips_m4k_poll(struct target *target)
115 {
116 int retval;
117 struct mips32_common *mips32 = target_to_mips32(target);
118 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
119 uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl;
120
121 /* read ejtag control reg */
122 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
123 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
124
125 /* clear this bit before handling polling
126 * as after reset registers will read zero */
127 if (ejtag_ctrl & EJTAG_CTRL_ROCC)
128 {
129 /* we have detected a reset, clear flag
130 * otherwise ejtag will not work */
131 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_ROCC;
132
133 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
134 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
135 LOG_DEBUG("Reset Detected");
136 }
137
138 /* check for processor halted */
139 if (ejtag_ctrl & EJTAG_CTRL_BRKST)
140 {
141 if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
142 {
143 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
144
145 target->state = TARGET_HALTED;
146
147 if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
148 return retval;
149
150 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
151 }
152 else if (target->state == TARGET_DEBUG_RUNNING)
153 {
154 target->state = TARGET_HALTED;
155
156 if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
157 return retval;
158
159 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
160 }
161 }
162 else
163 {
164 target->state = TARGET_RUNNING;
165 }
166
167 // LOG_DEBUG("ctrl = 0x%08X", ejtag_ctrl);
168
169 return ERROR_OK;
170 }
171
172 static int mips_m4k_halt(struct target *target)
173 {
174 struct mips32_common *mips32 = target_to_mips32(target);
175 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
176
177 LOG_DEBUG("target->state: %s",
178 target_state_name(target));
179
180 if (target->state == TARGET_HALTED)
181 {
182 LOG_DEBUG("target was already halted");
183 return ERROR_OK;
184 }
185
186 if (target->state == TARGET_UNKNOWN)
187 {
188 LOG_WARNING("target was in unknown state when halt was requested");
189 }
190
191 if (target->state == TARGET_RESET)
192 {
193 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst())
194 {
195 LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
196 return ERROR_TARGET_FAILURE;
197 }
198 else
199 {
200 /* we came here in a reset_halt or reset_init sequence
201 * debug entry was already prepared in mips32_prepare_reset_halt()
202 */
203 target->debug_reason = DBG_REASON_DBGRQ;
204
205 return ERROR_OK;
206 }
207 }
208
209 /* break processor */
210 mips_ejtag_enter_debug(ejtag_info);
211
212 target->debug_reason = DBG_REASON_DBGRQ;
213
214 return ERROR_OK;
215 }
216
217 static int mips_m4k_assert_reset(struct target *target)
218 {
219 struct mips_m4k_common *mips_m4k = target_to_m4k(target);
220 struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
221 int assert_srst = 1;
222
223 LOG_DEBUG("target->state: %s",
224 target_state_name(target));
225
226 enum reset_types jtag_reset_config = jtag_get_reset_config();
227
228 if (!(jtag_reset_config & RESET_HAS_SRST))
229 assert_srst = 0;
230
231 if (target->reset_halt)
232 {
233 /* use hardware to catch reset */
234 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT);
235 }
236 else
237 {
238 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
239 }
240
241 if (assert_srst)
242 {
243 /* here we should issue a srst only, but we may have to assert trst as well */
244 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
245 {
246 jtag_add_reset(1, 1);
247 }
248 else
249 {
250 jtag_add_reset(0, 1);
251 }
252 }
253 else
254 {
255 if (mips_m4k->is_pic32mx)
256 {
257 uint32_t mchip_cmd;
258
259 LOG_DEBUG("Using MTAP reset to reset processor...");
260
261 /* use microchip specific MTAP reset */
262 mips_ejtag_set_instr(ejtag_info, MTAP_SW_MTAP);
263 mips_ejtag_set_instr(ejtag_info, MTAP_COMMAND);
264
265 mchip_cmd = MCHP_ASERT_RST;
266 mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
267 mchip_cmd = MCHP_DE_ASSERT_RST;
268 mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
269 mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
270 }
271 else
272 {
273 /* use ejtag reset - not supported by all cores */
274 uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_PRRST | EJTAG_CTRL_PERRST;
275 LOG_DEBUG("Using EJTAG reset (PRRST) to reset processor...");
276 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
277 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
278 }
279 }
280
281 target->state = TARGET_RESET;
282 jtag_add_sleep(50000);
283
284 register_cache_invalidate(mips_m4k->mips32.core_cache);
285
286 if (target->reset_halt)
287 {
288 int retval;
289 if ((retval = target_halt(target)) != ERROR_OK)
290 return retval;
291 }
292
293 return ERROR_OK;
294 }
295
296 static int mips_m4k_deassert_reset(struct target *target)
297 {
298 LOG_DEBUG("target->state: %s",
299 target_state_name(target));
300
301 /* deassert reset lines */
302 jtag_add_reset(0, 0);
303
304 return ERROR_OK;
305 }
306
307 static int mips_m4k_soft_reset_halt(struct target *target)
308 {
309 /* TODO */
310 return ERROR_OK;
311 }
312
313 static int mips_m4k_single_step_core(struct target *target)
314 {
315 struct mips32_common *mips32 = target_to_mips32(target);
316 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
317
318 /* configure single step mode */
319 mips_ejtag_config_step(ejtag_info, 1);
320
321 /* disable interrupts while stepping */
322 mips32_enable_interrupts(target, 0);
323
324 /* exit debug mode */
325 mips_ejtag_exit_debug(ejtag_info);
326
327 mips_m4k_debug_entry(target);
328
329 return ERROR_OK;
330 }
331
332 static int mips_m4k_resume(struct target *target, int current,
333 uint32_t address, int handle_breakpoints, int debug_execution)
334 {
335 struct mips32_common *mips32 = target_to_mips32(target);
336 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
337 struct breakpoint *breakpoint = NULL;
338 uint32_t resume_pc;
339
340 if (target->state != TARGET_HALTED)
341 {
342 LOG_WARNING("target not halted");
343 return ERROR_TARGET_NOT_HALTED;
344 }
345
346 if (!debug_execution)
347 {
348 target_free_all_working_areas(target);
349 mips_m4k_enable_breakpoints(target);
350 mips_m4k_enable_watchpoints(target);
351 }
352
353 /* current = 1: continue on current pc, otherwise continue at <address> */
354 if (!current)
355 {
356 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
357 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
358 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
359 }
360
361 if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
362 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1, mips32->isa_mode);
363 }
364
365 resume_pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
366
367 mips32_restore_context(target);
368
369 /* the front-end may request us not to handle breakpoints */
370 if (handle_breakpoints)
371 {
372 /* Single step past breakpoint at current address */
373 if ((breakpoint = breakpoint_find(target, resume_pc)))
374 {
375 LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 "", breakpoint->address);
376 mips_m4k_unset_breakpoint(target, breakpoint);
377 mips_m4k_single_step_core(target);
378 mips_m4k_set_breakpoint(target, breakpoint);
379 }
380 }
381
382 /* enable interrupts if we are running */
383 mips32_enable_interrupts(target, !debug_execution);
384
385 /* exit debug mode */
386 mips_ejtag_exit_debug(ejtag_info);
387 target->debug_reason = DBG_REASON_NOTHALTED;
388
389 /* registers are now invalid */
390 register_cache_invalidate(mips32->core_cache);
391
392 if (!debug_execution)
393 {
394 target->state = TARGET_RUNNING;
395 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
396 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
397 }
398 else
399 {
400 target->state = TARGET_DEBUG_RUNNING;
401 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
402 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
403 }
404
405 return ERROR_OK;
406 }
407
408 static int mips_m4k_step(struct target *target, int current,
409 uint32_t address, int handle_breakpoints)
410 {
411 /* get pointers to arch-specific information */
412 struct mips32_common *mips32 = target_to_mips32(target);
413 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
414 struct breakpoint *breakpoint = NULL;
415
416 if (target->state != TARGET_HALTED)
417 {
418 LOG_WARNING("target not halted");
419 return ERROR_TARGET_NOT_HALTED;
420 }
421
422 /* current = 1: continue on current pc, otherwise continue at <address> */
423 if (!current)
424 {
425 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
426 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
427 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
428 }
429
430 /* the front-end may request us not to handle breakpoints */
431 if (handle_breakpoints) {
432 breakpoint = breakpoint_find(target,
433 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
434 if (breakpoint)
435 mips_m4k_unset_breakpoint(target, breakpoint);
436 }
437
438 /* restore context */
439 mips32_restore_context(target);
440
441 /* configure single step mode */
442 mips_ejtag_config_step(ejtag_info, 1);
443
444 target->debug_reason = DBG_REASON_SINGLESTEP;
445
446 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
447
448 /* disable interrupts while stepping */
449 mips32_enable_interrupts(target, 0);
450
451 /* exit debug mode */
452 mips_ejtag_exit_debug(ejtag_info);
453
454 /* registers are now invalid */
455 register_cache_invalidate(mips32->core_cache);
456
457 if (breakpoint)
458 mips_m4k_set_breakpoint(target, breakpoint);
459
460 LOG_DEBUG("target stepped ");
461
462 mips_m4k_debug_entry(target);
463 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
464
465 return ERROR_OK;
466 }
467
468 static void mips_m4k_enable_breakpoints(struct target *target)
469 {
470 struct breakpoint *breakpoint = target->breakpoints;
471
472 /* set any pending breakpoints */
473 while (breakpoint)
474 {
475 if (breakpoint->set == 0)
476 mips_m4k_set_breakpoint(target, breakpoint);
477 breakpoint = breakpoint->next;
478 }
479 }
480
481 static int mips_m4k_set_breakpoint(struct target *target,
482 struct breakpoint *breakpoint)
483 {
484 struct mips32_common *mips32 = target_to_mips32(target);
485 struct mips32_comparator * comparator_list = mips32->inst_break_list;
486 int retval;
487
488 if (breakpoint->set)
489 {
490 LOG_WARNING("breakpoint already set");
491 return ERROR_OK;
492 }
493
494 if (breakpoint->type == BKPT_HARD)
495 {
496 int bp_num = 0;
497
498 while (comparator_list[bp_num].used && (bp_num < mips32->num_inst_bpoints))
499 bp_num++;
500 if (bp_num >= mips32->num_inst_bpoints)
501 {
502 LOG_ERROR("Can not find free FP Comparator(bpid: %d)",
503 breakpoint->unique_id );
504 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
505 }
506 breakpoint->set = bp_num + 1;
507 comparator_list[bp_num].used = 1;
508 comparator_list[bp_num].bp_value = breakpoint->address;
509 target_write_u32(target, comparator_list[bp_num].reg_address, comparator_list[bp_num].bp_value);
510 target_write_u32(target, comparator_list[bp_num].reg_address + 0x08, 0x00000000);
511 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 1);
512 LOG_DEBUG("bpid: %d, bp_num %i bp_value 0x%" PRIx32 "",
513 breakpoint->unique_id,
514 bp_num, comparator_list[bp_num].bp_value);
515 }
516 else if (breakpoint->type == BKPT_SOFT)
517 {
518 LOG_DEBUG("bpid: %d", breakpoint->unique_id );
519 if (breakpoint->length == 4)
520 {
521 uint32_t verify = 0xffffffff;
522
523 if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
524 breakpoint->orig_instr)) != ERROR_OK)
525 {
526 return retval;
527 }
528 if ((retval = target_write_u32(target, breakpoint->address, MIPS32_SDBBP)) != ERROR_OK)
529 {
530 return retval;
531 }
532
533 if ((retval = target_read_u32(target, breakpoint->address, &verify)) != ERROR_OK)
534 {
535 return retval;
536 }
537 if (verify != MIPS32_SDBBP)
538 {
539 LOG_ERROR("Unable to set 32bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
540 return ERROR_OK;
541 }
542 }
543 else
544 {
545 uint16_t verify = 0xffff;
546
547 if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
548 breakpoint->orig_instr)) != ERROR_OK)
549 {
550 return retval;
551 }
552 if ((retval = target_write_u16(target, breakpoint->address, MIPS16_SDBBP)) != ERROR_OK)
553 {
554 return retval;
555 }
556
557 if ((retval = target_read_u16(target, breakpoint->address, &verify)) != ERROR_OK)
558 {
559 return retval;
560 }
561 if (verify != MIPS16_SDBBP)
562 {
563 LOG_ERROR("Unable to set 16bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
564 return ERROR_OK;
565 }
566 }
567
568 breakpoint->set = 20; /* Any nice value but 0 */
569 }
570
571 return ERROR_OK;
572 }
573
574 static int mips_m4k_unset_breakpoint(struct target *target,
575 struct breakpoint *breakpoint)
576 {
577 /* get pointers to arch-specific information */
578 struct mips32_common *mips32 = target_to_mips32(target);
579 struct mips32_comparator *comparator_list = mips32->inst_break_list;
580 int retval;
581
582 if (!breakpoint->set)
583 {
584 LOG_WARNING("breakpoint not set");
585 return ERROR_OK;
586 }
587
588 if (breakpoint->type == BKPT_HARD)
589 {
590 int bp_num = breakpoint->set - 1;
591 if ((bp_num < 0) || (bp_num >= mips32->num_inst_bpoints))
592 {
593 LOG_DEBUG("Invalid FP Comparator number in breakpoint (bpid: %d)",
594 breakpoint->unique_id);
595 return ERROR_OK;
596 }
597 LOG_DEBUG("bpid: %d - releasing hw: %d",
598 breakpoint->unique_id,
599 bp_num );
600 comparator_list[bp_num].used = 0;
601 comparator_list[bp_num].bp_value = 0;
602 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 0);
603
604 }
605 else
606 {
607 /* restore original instruction (kept in target endianness) */
608 LOG_DEBUG("bpid: %d", breakpoint->unique_id);
609 if (breakpoint->length == 4)
610 {
611 uint32_t current_instr;
612
613 /* check that user program has not modified breakpoint instruction */
614 if ((retval = target_read_memory(target, breakpoint->address, 4, 1,
615 (uint8_t*)&current_instr)) != ERROR_OK)
616 {
617 return retval;
618 }
619 if (current_instr == MIPS32_SDBBP)
620 {
621 if ((retval = target_write_memory(target, breakpoint->address, 4, 1,
622 breakpoint->orig_instr)) != ERROR_OK)
623 {
624 return retval;
625 }
626 }
627 }
628 else
629 {
630 uint16_t current_instr;
631
632 /* check that user program has not modified breakpoint instruction */
633 if ((retval = target_read_memory(target, breakpoint->address, 2, 1,
634 (uint8_t*)&current_instr)) != ERROR_OK)
635 {
636 return retval;
637 }
638
639 if (current_instr == MIPS16_SDBBP)
640 {
641 if ((retval = target_write_memory(target, breakpoint->address, 2, 1,
642 breakpoint->orig_instr)) != ERROR_OK)
643 {
644 return retval;
645 }
646 }
647 }
648 }
649 breakpoint->set = 0;
650
651 return ERROR_OK;
652 }
653
654 static int mips_m4k_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
655 {
656 struct mips32_common *mips32 = target_to_mips32(target);
657
658 if (breakpoint->type == BKPT_HARD)
659 {
660 if (mips32->num_inst_bpoints_avail < 1)
661 {
662 LOG_INFO("no hardware breakpoint available");
663 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
664 }
665
666 mips32->num_inst_bpoints_avail--;
667 }
668
669 return mips_m4k_set_breakpoint(target, breakpoint);
670 }
671
672 static int mips_m4k_remove_breakpoint(struct target *target,
673 struct breakpoint *breakpoint)
674 {
675 /* get pointers to arch-specific information */
676 struct mips32_common *mips32 = target_to_mips32(target);
677
678 if (target->state != TARGET_HALTED)
679 {
680 LOG_WARNING("target not halted");
681 return ERROR_TARGET_NOT_HALTED;
682 }
683
684 if (breakpoint->set)
685 {
686 mips_m4k_unset_breakpoint(target, breakpoint);
687 }
688
689 if (breakpoint->type == BKPT_HARD)
690 mips32->num_inst_bpoints_avail++;
691
692 return ERROR_OK;
693 }
694
695 static int mips_m4k_set_watchpoint(struct target *target,
696 struct watchpoint *watchpoint)
697 {
698 struct mips32_common *mips32 = target_to_mips32(target);
699 struct mips32_comparator *comparator_list = mips32->data_break_list;
700 int wp_num = 0;
701 /*
702 * watchpoint enabled, ignore all byte lanes in value register
703 * and exclude both load and store accesses from watchpoint
704 * condition evaluation
705 */
706 int enable = EJTAG_DBCn_NOSB | EJTAG_DBCn_NOLB | EJTAG_DBCn_BE |
707 (0xff << EJTAG_DBCn_BLM_SHIFT);
708
709 if (watchpoint->set)
710 {
711 LOG_WARNING("watchpoint already set");
712 return ERROR_OK;
713 }
714
715 while(comparator_list[wp_num].used && (wp_num < mips32->num_data_bpoints))
716 wp_num++;
717 if (wp_num >= mips32->num_data_bpoints)
718 {
719 LOG_ERROR("Can not find free FP Comparator");
720 return ERROR_FAIL;
721 }
722
723 if (watchpoint->length != 4)
724 {
725 LOG_ERROR("Only watchpoints of length 4 are supported");
726 return ERROR_TARGET_UNALIGNED_ACCESS;
727 }
728
729 if (watchpoint->address % 4)
730 {
731 LOG_ERROR("Watchpoints address should be word aligned");
732 return ERROR_TARGET_UNALIGNED_ACCESS;
733 }
734
735 switch (watchpoint->rw)
736 {
737 case WPT_READ:
738 enable &= ~EJTAG_DBCn_NOLB;
739 break;
740 case WPT_WRITE:
741 enable &= ~EJTAG_DBCn_NOSB;
742 break;
743 case WPT_ACCESS:
744 enable &= ~(EJTAG_DBCn_NOLB | EJTAG_DBCn_NOSB);
745 break;
746 default:
747 LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
748 }
749
750 watchpoint->set = wp_num + 1;
751 comparator_list[wp_num].used = 1;
752 comparator_list[wp_num].bp_value = watchpoint->address;
753 target_write_u32(target, comparator_list[wp_num].reg_address, comparator_list[wp_num].bp_value);
754 target_write_u32(target, comparator_list[wp_num].reg_address + 0x08, 0x00000000);
755 target_write_u32(target, comparator_list[wp_num].reg_address + 0x10, 0x00000000);
756 target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, enable);
757 target_write_u32(target, comparator_list[wp_num].reg_address + 0x20, 0);
758 LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "", wp_num, comparator_list[wp_num].bp_value);
759
760 return ERROR_OK;
761 }
762
763 static int mips_m4k_unset_watchpoint(struct target *target,
764 struct watchpoint *watchpoint)
765 {
766 /* get pointers to arch-specific information */
767 struct mips32_common *mips32 = target_to_mips32(target);
768 struct mips32_comparator *comparator_list = mips32->data_break_list;
769
770 if (!watchpoint->set)
771 {
772 LOG_WARNING("watchpoint not set");
773 return ERROR_OK;
774 }
775
776 int wp_num = watchpoint->set - 1;
777 if ((wp_num < 0) || (wp_num >= mips32->num_data_bpoints))
778 {
779 LOG_DEBUG("Invalid FP Comparator number in watchpoint");
780 return ERROR_OK;
781 }
782 comparator_list[wp_num].used = 0;
783 comparator_list[wp_num].bp_value = 0;
784 target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, 0);
785 watchpoint->set = 0;
786
787 return ERROR_OK;
788 }
789
790 static int mips_m4k_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
791 {
792 struct mips32_common *mips32 = target_to_mips32(target);
793
794 if (mips32->num_data_bpoints_avail < 1)
795 {
796 LOG_INFO("no hardware watchpoints available");
797 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
798 }
799
800 mips32->num_data_bpoints_avail--;
801
802 mips_m4k_set_watchpoint(target, watchpoint);
803 return ERROR_OK;
804 }
805
806 static int mips_m4k_remove_watchpoint(struct target *target,
807 struct watchpoint *watchpoint)
808 {
809 /* get pointers to arch-specific information */
810 struct mips32_common *mips32 = target_to_mips32(target);
811
812 if (target->state != TARGET_HALTED)
813 {
814 LOG_WARNING("target not halted");
815 return ERROR_TARGET_NOT_HALTED;
816 }
817
818 if (watchpoint->set)
819 {
820 mips_m4k_unset_watchpoint(target, watchpoint);
821 }
822
823 mips32->num_data_bpoints_avail++;
824
825 return ERROR_OK;
826 }
827
828 static void mips_m4k_enable_watchpoints(struct target *target)
829 {
830 struct watchpoint *watchpoint = target->watchpoints;
831
832 /* set any pending watchpoints */
833 while (watchpoint)
834 {
835 if (watchpoint->set == 0)
836 mips_m4k_set_watchpoint(target, watchpoint);
837 watchpoint = watchpoint->next;
838 }
839 }
840
841 static int mips_m4k_read_memory(struct target *target, uint32_t address,
842 uint32_t size, uint32_t count, uint8_t *buffer)
843 {
844 struct mips32_common *mips32 = target_to_mips32(target);
845 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
846
847 LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, size, count);
848
849 if (target->state != TARGET_HALTED)
850 {
851 LOG_WARNING("target not halted");
852 return ERROR_TARGET_NOT_HALTED;
853 }
854
855 /* sanitize arguments */
856 if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
857 return ERROR_INVALID_ARGUMENTS;
858
859 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
860 return ERROR_TARGET_UNALIGNED_ACCESS;
861
862 /* if noDMA off, use DMAACC mode for memory read */
863 int retval;
864 if (ejtag_info->impcode & EJTAG_IMP_NODMA)
865 retval = mips32_pracc_read_mem(ejtag_info, address, size, count, (void *)buffer);
866 else
867 retval = mips32_dmaacc_read_mem(ejtag_info, address, size, count, (void *)buffer);
868 if (ERROR_OK != retval)
869 return retval;
870
871 return ERROR_OK;
872 }
873
874 static int mips_m4k_write_memory(struct target *target, uint32_t address,
875 uint32_t size, uint32_t count, uint8_t *buffer)
876 {
877 struct mips32_common *mips32 = target_to_mips32(target);
878 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
879
880 LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "",
881 address, size, count);
882
883 if (target->state != TARGET_HALTED)
884 {
885 LOG_WARNING("target not halted");
886 return ERROR_TARGET_NOT_HALTED;
887 }
888
889 /* sanitize arguments */
890 if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
891 return ERROR_INVALID_ARGUMENTS;
892
893 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
894 return ERROR_TARGET_UNALIGNED_ACCESS;
895
896 /* if noDMA off, use DMAACC mode for memory write */
897 if (ejtag_info->impcode & EJTAG_IMP_NODMA)
898 return mips32_pracc_write_mem(ejtag_info, address, size, count, (void *)buffer);
899 else
900 return mips32_dmaacc_write_mem(ejtag_info, address, size, count, (void *)buffer);
901 }
902
903 static int mips_m4k_init_target(struct command_context *cmd_ctx,
904 struct target *target)
905 {
906 mips32_build_reg_cache(target);
907
908 return ERROR_OK;
909 }
910
911 static int mips_m4k_init_arch_info(struct target *target,
912 struct mips_m4k_common *mips_m4k, struct jtag_tap *tap)
913 {
914 struct mips32_common *mips32 = &mips_m4k->mips32;
915
916 mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
917
918 /* initialize mips4k specific info */
919 mips32_init_arch_info(target, mips32, tap);
920 mips32->arch_info = mips_m4k;
921
922 return ERROR_OK;
923 }
924
925 static int mips_m4k_target_create(struct target *target, Jim_Interp *interp)
926 {
927 struct mips_m4k_common *mips_m4k = calloc(1, sizeof(struct mips_m4k_common));
928
929 mips_m4k_init_arch_info(target, mips_m4k, target->tap);
930
931 return ERROR_OK;
932 }
933
934 static int mips_m4k_examine(struct target *target)
935 {
936 int retval;
937 struct mips_m4k_common *mips_m4k = target_to_m4k(target);
938 struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
939 uint32_t idcode = 0;
940
941 if (!target_was_examined(target))
942 {
943 retval = mips_ejtag_get_idcode(ejtag_info, &idcode);
944 if (retval != ERROR_OK)
945 return retval;
946 ejtag_info->idcode = idcode;
947
948 if (((idcode >> 1) & 0x7FF) == 0x29)
949 {
950 /* we are using a pic32mx so select ejtag port
951 * as it is not selected by default */
952 mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
953 LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
954 mips_m4k->is_pic32mx = true;
955 }
956 }
957
958 /* init rest of ejtag interface */
959 if ((retval = mips_ejtag_init(ejtag_info)) != ERROR_OK)
960 return retval;
961
962 if ((retval = mips32_examine(target)) != ERROR_OK)
963 return retval;
964
965 return ERROR_OK;
966 }
967
968 static int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
969 uint32_t count, uint8_t *buffer)
970 {
971 struct mips32_common *mips32 = target_to_mips32(target);
972 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
973 int retval;
974 int write_t = 1;
975
976 LOG_DEBUG("address: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, count);
977
978 if (target->state != TARGET_HALTED)
979 {
980 LOG_WARNING("target not halted");
981 return ERROR_TARGET_NOT_HALTED;
982 }
983
984 /* check alignment */
985 if (address & 0x3u)
986 return ERROR_TARGET_UNALIGNED_ACCESS;
987
988 if (mips32->fast_data_area == NULL)
989 {
990 /* Get memory for block write handler
991 * we preserve this area between calls and gain a speed increase
992 * of about 3kb/sec when writing flash
993 * this will be released/nulled by the system when the target is resumed or reset */
994 retval = target_alloc_working_area(target,
995 MIPS32_FASTDATA_HANDLER_SIZE,
996 &mips32->fast_data_area);
997 if (retval != ERROR_OK)
998 {
999 LOG_WARNING("No working area available, falling back to non-bulk write");
1000 return mips_m4k_write_memory(target, address, 4, count, buffer);
1001 }
1002
1003 /* reset fastadata state so the algo get reloaded */
1004 ejtag_info->fast_access_save = -1;
1005 }
1006
1007 /* TAP data register is loaded LSB first (little endian) */
1008 if (target->endianness == TARGET_BIG_ENDIAN)
1009 {
1010 uint32_t i, t32;
1011 for(i = 0; i < (count * 4); i += 4)
1012 {
1013 t32 = be_to_h_u32((uint8_t *) &buffer[i]);
1014 h_u32_to_le(&buffer[i], t32);
1015 }
1016 }
1017
1018 retval = mips32_pracc_fastdata_xfer(ejtag_info, mips32->fast_data_area, write_t, address,
1019 count, (uint32_t*) (void *)buffer);
1020 if (retval != ERROR_OK)
1021 {
1022 /* FASTDATA access failed, try normal memory write */
1023 LOG_DEBUG("Fastdata access Failed, falling back to non-bulk write");
1024 retval = mips_m4k_write_memory(target, address, 4, count, buffer);
1025 }
1026
1027 return retval;
1028 }
1029
1030 struct target_type mips_m4k_target =
1031 {
1032 .name = "mips_m4k",
1033
1034 .poll = mips_m4k_poll,
1035 .arch_state = mips32_arch_state,
1036
1037 .target_request_data = NULL,
1038
1039 .halt = mips_m4k_halt,
1040 .resume = mips_m4k_resume,
1041 .step = mips_m4k_step,
1042
1043 .assert_reset = mips_m4k_assert_reset,
1044 .deassert_reset = mips_m4k_deassert_reset,
1045 .soft_reset_halt = mips_m4k_soft_reset_halt,
1046
1047 .get_gdb_reg_list = mips32_get_gdb_reg_list,
1048
1049 .read_memory = mips_m4k_read_memory,
1050 .write_memory = mips_m4k_write_memory,
1051 .bulk_write_memory = mips_m4k_bulk_write_memory,
1052 .checksum_memory = mips32_checksum_memory,
1053 .blank_check_memory = mips32_blank_check_memory,
1054
1055 .run_algorithm = mips32_run_algorithm,
1056
1057 .add_breakpoint = mips_m4k_add_breakpoint,
1058 .remove_breakpoint = mips_m4k_remove_breakpoint,
1059 .add_watchpoint = mips_m4k_add_watchpoint,
1060 .remove_watchpoint = mips_m4k_remove_watchpoint,
1061
1062 .target_create = mips_m4k_target_create,
1063 .init_target = mips_m4k_init_target,
1064 .examine = mips_m4k_examine,
1065 };