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mips: fix reading uint32 and uint16 when running on big endian host
[openocd.git] / src / target / mips_m4k.c
blobfacf9a5676f843d4f1e42ecf4ffe34c20c798818
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 * Copyright (C) 2011 by Drasko DRASKOVIC *
10 * drasko.draskovic@gmail.com *
11 * *
12 * This program is free software; you can redistribute it and/or modify *
13 * it under the terms of the GNU General Public License as published by *
14 * the Free Software Foundation; either version 2 of the License, or *
15 * (at your option) any later version. *
16 * *
17 * This program is distributed in the hope that it will be useful, *
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
20 * GNU General Public License for more details. *
21 * *
22 * You should have received a copy of the GNU General Public License *
23 * along with this program; if not, write to the *
24 * Free Software Foundation, Inc., *
25 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
26 ***************************************************************************/
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include "breakpoints.h"
32 #include "mips32.h"
33 #include "mips_m4k.h"
34 #include "mips32_dmaacc.h"
35 #include "target_type.h"
36 #include "register.h"
37
38 static void mips_m4k_enable_breakpoints(struct target *target);
39 static void mips_m4k_enable_watchpoints(struct target *target);
40 static int mips_m4k_set_breakpoint(struct target *target,
41 struct breakpoint *breakpoint);
42 static int mips_m4k_unset_breakpoint(struct target *target,
43 struct breakpoint *breakpoint);
44
45 static int mips_m4k_examine_debug_reason(struct target *target)
46 {
47 uint32_t break_status;
48 int retval;
49
50 if ((target->debug_reason != DBG_REASON_DBGRQ)
51 && (target->debug_reason != DBG_REASON_SINGLESTEP))
52 {
53 /* get info about inst breakpoint support */
54 if ((retval = target_read_u32(target, EJTAG_IBS, &break_status)) != ERROR_OK)
55 return retval;
56 if (break_status & 0x1f)
57 {
58 /* we have halted on a breakpoint */
59 if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
60 return retval;
61 target->debug_reason = DBG_REASON_BREAKPOINT;
62 }
63
64 /* get info about data breakpoint support */
65 if ((retval = target_read_u32(target, EJTAG_DBS, &break_status)) != ERROR_OK)
66 return retval;
67 if (break_status & 0x1f)
68 {
69 /* we have halted on a breakpoint */
70 if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
71 return retval;
72 target->debug_reason = DBG_REASON_WATCHPOINT;
73 }
74 }
75
76 return ERROR_OK;
77 }
78
79 static int mips_m4k_debug_entry(struct target *target)
80 {
81 struct mips32_common *mips32 = target_to_mips32(target);
82 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
83 uint32_t debug_reg;
84
85 /* read debug register */
86 mips_ejtag_read_debug(ejtag_info, &debug_reg);
87
88 /* make sure break unit configured */
89 mips32_configure_break_unit(target);
90
91 /* attempt to find halt reason */
92 mips_m4k_examine_debug_reason(target);
93
94 /* clear single step if active */
95 if (debug_reg & EJTAG_DEBUG_DSS)
96 {
97 /* stopped due to single step - clear step bit */
98 mips_ejtag_config_step(ejtag_info, 0);
99 }
100
101 mips32_save_context(target);
102
103 /* default to mips32 isa, it will be changed below if required */
104 mips32->isa_mode = MIPS32_ISA_MIPS32;
105
106 if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
107 mips32->isa_mode = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1);
108 }
109
110 LOG_DEBUG("entered debug state at PC 0x%" PRIx32 ", target->state: %s",
111 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32),
112 target_state_name(target));
113
114 return ERROR_OK;
115 }
116
117 static int mips_m4k_poll(struct target *target)
118 {
119 int retval;
120 struct mips32_common *mips32 = target_to_mips32(target);
121 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
122 uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl;
123
124 /* read ejtag control reg */
125 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
126 retval = mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
127 if (retval != ERROR_OK)
128 return retval;
129
130 /* clear this bit before handling polling
131 * as after reset registers will read zero */
132 if (ejtag_ctrl & EJTAG_CTRL_ROCC)
133 {
134 /* we have detected a reset, clear flag
135 * otherwise ejtag will not work */
136 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_ROCC;
137
138 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
139 retval = mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
140 if (retval != ERROR_OK)
141 return retval;
142 LOG_DEBUG("Reset Detected");
143 }
144
145 /* check for processor halted */
146 if (ejtag_ctrl & EJTAG_CTRL_BRKST)
147 {
148 if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
149 {
150 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
151
152 target->state = TARGET_HALTED;
153
154 if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
155 return retval;
156
157 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
158 }
159 else if (target->state == TARGET_DEBUG_RUNNING)
160 {
161 target->state = TARGET_HALTED;
162
163 if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
164 return retval;
165
166 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
167 }
168 }
169 else
170 {
171 target->state = TARGET_RUNNING;
172 }
173
174 // LOG_DEBUG("ctrl = 0x%08X", ejtag_ctrl);
175
176 return ERROR_OK;
177 }
178
179 static int mips_m4k_halt(struct target *target)
180 {
181 struct mips32_common *mips32 = target_to_mips32(target);
182 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
183
184 LOG_DEBUG("target->state: %s",
185 target_state_name(target));
186
187 if (target->state == TARGET_HALTED)
188 {
189 LOG_DEBUG("target was already halted");
190 return ERROR_OK;
191 }
192
193 if (target->state == TARGET_UNKNOWN)
194 {
195 LOG_WARNING("target was in unknown state when halt was requested");
196 }
197
198 if (target->state == TARGET_RESET)
199 {
200 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst())
201 {
202 LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
203 return ERROR_TARGET_FAILURE;
204 }
205 else
206 {
207 /* we came here in a reset_halt or reset_init sequence
208 * debug entry was already prepared in mips32_prepare_reset_halt()
209 */
210 target->debug_reason = DBG_REASON_DBGRQ;
211
212 return ERROR_OK;
213 }
214 }
215
216 /* break processor */
217 mips_ejtag_enter_debug(ejtag_info);
218
219 target->debug_reason = DBG_REASON_DBGRQ;
220
221 return ERROR_OK;
222 }
223
224 static int mips_m4k_assert_reset(struct target *target)
225 {
226 struct mips_m4k_common *mips_m4k = target_to_m4k(target);
227 struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
228 int assert_srst = 1;
229
230 LOG_DEBUG("target->state: %s",
231 target_state_name(target));
232
233 enum reset_types jtag_reset_config = jtag_get_reset_config();
234
235 if (!(jtag_reset_config & RESET_HAS_SRST))
236 assert_srst = 0;
237
238 if (target->reset_halt)
239 {
240 /* use hardware to catch reset */
241 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT);
242 }
243 else
244 {
245 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
246 }
247
248 if (assert_srst)
249 {
250 /* here we should issue a srst only, but we may have to assert trst as well */
251 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
252 {
253 jtag_add_reset(1, 1);
254 }
255 else
256 {
257 jtag_add_reset(0, 1);
258 }
259 }
260 else
261 {
262 if (mips_m4k->is_pic32mx)
263 {
264 LOG_DEBUG("Using MTAP reset to reset processor...");
265
266 /* use microchip specific MTAP reset */
267 mips_ejtag_set_instr(ejtag_info, MTAP_SW_MTAP);
268 mips_ejtag_set_instr(ejtag_info, MTAP_COMMAND);
269
270 mips_ejtag_drscan_8_out(ejtag_info, MCHP_ASERT_RST);
271 mips_ejtag_drscan_8_out(ejtag_info, MCHP_DE_ASSERT_RST);
272 mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
273 }
274 else
275 {
276 /* use ejtag reset - not supported by all cores */
277 uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_PRRST | EJTAG_CTRL_PERRST;
278 LOG_DEBUG("Using EJTAG reset (PRRST) to reset processor...");
279 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
280 mips_ejtag_drscan_32_out(ejtag_info, ejtag_ctrl);
281 }
282 }
283
284 target->state = TARGET_RESET;
285 jtag_add_sleep(50000);
286
287 register_cache_invalidate(mips_m4k->mips32.core_cache);
288
289 if (target->reset_halt)
290 {
291 int retval;
292 if ((retval = target_halt(target)) != ERROR_OK)
293 return retval;
294 }
295
296 return ERROR_OK;
297 }
298
299 static int mips_m4k_deassert_reset(struct target *target)
300 {
301 LOG_DEBUG("target->state: %s",
302 target_state_name(target));
303
304 /* deassert reset lines */
305 jtag_add_reset(0, 0);
306
307 return ERROR_OK;
308 }
309
310 static int mips_m4k_soft_reset_halt(struct target *target)
311 {
312 /* TODO */
313 return ERROR_OK;
314 }
315
316 static int mips_m4k_single_step_core(struct target *target)
317 {
318 struct mips32_common *mips32 = target_to_mips32(target);
319 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
320
321 /* configure single step mode */
322 mips_ejtag_config_step(ejtag_info, 1);
323
324 /* disable interrupts while stepping */
325 mips32_enable_interrupts(target, 0);
326
327 /* exit debug mode */
328 mips_ejtag_exit_debug(ejtag_info);
329
330 mips_m4k_debug_entry(target);
331
332 return ERROR_OK;
333 }
334
335 static int mips_m4k_resume(struct target *target, int current,
336 uint32_t address, int handle_breakpoints, int debug_execution)
337 {
338 struct mips32_common *mips32 = target_to_mips32(target);
339 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
340 struct breakpoint *breakpoint = NULL;
341 uint32_t resume_pc;
342
343 if (target->state != TARGET_HALTED)
344 {
345 LOG_WARNING("target not halted");
346 return ERROR_TARGET_NOT_HALTED;
347 }
348
349 if (!debug_execution)
350 {
351 target_free_all_working_areas(target);
352 mips_m4k_enable_breakpoints(target);
353 mips_m4k_enable_watchpoints(target);
354 }
355
356 /* current = 1: continue on current pc, otherwise continue at <address> */
357 if (!current)
358 {
359 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
360 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
361 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
362 }
363
364 if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
365 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1, mips32->isa_mode);
366 }
367
368 resume_pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
369
370 mips32_restore_context(target);
371
372 /* the front-end may request us not to handle breakpoints */
373 if (handle_breakpoints)
374 {
375 /* Single step past breakpoint at current address */
376 if ((breakpoint = breakpoint_find(target, resume_pc)))
377 {
378 LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 "", breakpoint->address);
379 mips_m4k_unset_breakpoint(target, breakpoint);
380 mips_m4k_single_step_core(target);
381 mips_m4k_set_breakpoint(target, breakpoint);
382 }
383 }
384
385 /* enable interrupts if we are running */
386 mips32_enable_interrupts(target, !debug_execution);
387
388 /* exit debug mode */
389 mips_ejtag_exit_debug(ejtag_info);
390 target->debug_reason = DBG_REASON_NOTHALTED;
391
392 /* registers are now invalid */
393 register_cache_invalidate(mips32->core_cache);
394
395 if (!debug_execution)
396 {
397 target->state = TARGET_RUNNING;
398 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
399 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
400 }
401 else
402 {
403 target->state = TARGET_DEBUG_RUNNING;
404 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
405 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
406 }
407
408 return ERROR_OK;
409 }
410
411 static int mips_m4k_step(struct target *target, int current,
412 uint32_t address, int handle_breakpoints)
413 {
414 /* get pointers to arch-specific information */
415 struct mips32_common *mips32 = target_to_mips32(target);
416 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
417 struct breakpoint *breakpoint = NULL;
418
419 if (target->state != TARGET_HALTED)
420 {
421 LOG_WARNING("target not halted");
422 return ERROR_TARGET_NOT_HALTED;
423 }
424
425 /* current = 1: continue on current pc, otherwise continue at <address> */
426 if (!current)
427 {
428 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
429 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
430 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
431 }
432
433 /* the front-end may request us not to handle breakpoints */
434 if (handle_breakpoints) {
435 breakpoint = breakpoint_find(target,
436 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
437 if (breakpoint)
438 mips_m4k_unset_breakpoint(target, breakpoint);
439 }
440
441 /* restore context */
442 mips32_restore_context(target);
443
444 /* configure single step mode */
445 mips_ejtag_config_step(ejtag_info, 1);
446
447 target->debug_reason = DBG_REASON_SINGLESTEP;
448
449 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
450
451 /* disable interrupts while stepping */
452 mips32_enable_interrupts(target, 0);
453
454 /* exit debug mode */
455 mips_ejtag_exit_debug(ejtag_info);
456
457 /* registers are now invalid */
458 register_cache_invalidate(mips32->core_cache);
459
460 if (breakpoint)
461 mips_m4k_set_breakpoint(target, breakpoint);
462
463 LOG_DEBUG("target stepped ");
464
465 mips_m4k_debug_entry(target);
466 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
467
468 return ERROR_OK;
469 }
470
471 static void mips_m4k_enable_breakpoints(struct target *target)
472 {
473 struct breakpoint *breakpoint = target->breakpoints;
474
475 /* set any pending breakpoints */
476 while (breakpoint)
477 {
478 if (breakpoint->set == 0)
479 mips_m4k_set_breakpoint(target, breakpoint);
480 breakpoint = breakpoint->next;
481 }
482 }
483
484 static int mips_m4k_set_breakpoint(struct target *target,
485 struct breakpoint *breakpoint)
486 {
487 struct mips32_common *mips32 = target_to_mips32(target);
488 struct mips32_comparator * comparator_list = mips32->inst_break_list;
489 int retval;
490
491 if (breakpoint->set)
492 {
493 LOG_WARNING("breakpoint already set");
494 return ERROR_OK;
495 }
496
497 if (breakpoint->type == BKPT_HARD)
498 {
499 int bp_num = 0;
500
501 while (comparator_list[bp_num].used && (bp_num < mips32->num_inst_bpoints))
502 bp_num++;
503 if (bp_num >= mips32->num_inst_bpoints)
504 {
505 LOG_ERROR("Can not find free FP Comparator(bpid: %d)",
506 breakpoint->unique_id );
507 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
508 }
509 breakpoint->set = bp_num + 1;
510 comparator_list[bp_num].used = 1;
511 comparator_list[bp_num].bp_value = breakpoint->address;
512 target_write_u32(target, comparator_list[bp_num].reg_address, comparator_list[bp_num].bp_value);
513 target_write_u32(target, comparator_list[bp_num].reg_address + 0x08, 0x00000000);
514 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 1);
515 LOG_DEBUG("bpid: %d, bp_num %i bp_value 0x%" PRIx32 "",
516 breakpoint->unique_id,
517 bp_num, comparator_list[bp_num].bp_value);
518 }
519 else if (breakpoint->type == BKPT_SOFT)
520 {
521 LOG_DEBUG("bpid: %d", breakpoint->unique_id );
522 if (breakpoint->length == 4)
523 {
524 uint32_t verify = 0xffffffff;
525
526 if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
527 breakpoint->orig_instr)) != ERROR_OK)
528 {
529 return retval;
530 }
531 if ((retval = target_write_u32(target, breakpoint->address, MIPS32_SDBBP)) != ERROR_OK)
532 {
533 return retval;
534 }
535
536 if ((retval = target_read_u32(target, breakpoint->address, &verify)) != ERROR_OK)
537 {
538 return retval;
539 }
540 if (verify != MIPS32_SDBBP)
541 {
542 LOG_ERROR("Unable to set 32bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
543 return ERROR_OK;
544 }
545 }
546 else
547 {
548 uint16_t verify = 0xffff;
549
550 if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
551 breakpoint->orig_instr)) != ERROR_OK)
552 {
553 return retval;
554 }
555 if ((retval = target_write_u16(target, breakpoint->address, MIPS16_SDBBP)) != ERROR_OK)
556 {
557 return retval;
558 }
559
560 if ((retval = target_read_u16(target, breakpoint->address, &verify)) != ERROR_OK)
561 {
562 return retval;
563 }
564 if (verify != MIPS16_SDBBP)
565 {
566 LOG_ERROR("Unable to set 16bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
567 return ERROR_OK;
568 }
569 }
570
571 breakpoint->set = 20; /* Any nice value but 0 */
572 }
573
574 return ERROR_OK;
575 }
576
577 static int mips_m4k_unset_breakpoint(struct target *target,
578 struct breakpoint *breakpoint)
579 {
580 /* get pointers to arch-specific information */
581 struct mips32_common *mips32 = target_to_mips32(target);
582 struct mips32_comparator *comparator_list = mips32->inst_break_list;
583 int retval;
584
585 if (!breakpoint->set)
586 {
587 LOG_WARNING("breakpoint not set");
588 return ERROR_OK;
589 }
590
591 if (breakpoint->type == BKPT_HARD)
592 {
593 int bp_num = breakpoint->set - 1;
594 if ((bp_num < 0) || (bp_num >= mips32->num_inst_bpoints))
595 {
596 LOG_DEBUG("Invalid FP Comparator number in breakpoint (bpid: %d)",
597 breakpoint->unique_id);
598 return ERROR_OK;
599 }
600 LOG_DEBUG("bpid: %d - releasing hw: %d",
601 breakpoint->unique_id,
602 bp_num );
603 comparator_list[bp_num].used = 0;
604 comparator_list[bp_num].bp_value = 0;
605 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 0);
606
607 }
608 else
609 {
610 /* restore original instruction (kept in target endianness) */
611 LOG_DEBUG("bpid: %d", breakpoint->unique_id);
612 if (breakpoint->length == 4)
613 {
614 uint32_t current_instr;
615
616 /* check that user program has not modified breakpoint instruction */
617 if ((retval = target_read_memory(target, breakpoint->address, 4, 1,
618 (uint8_t*)&current_instr)) != ERROR_OK)
619 {
620 return retval;
621 }
622
623 /**
624 * target_read_memory() gets us data in _target_ endianess.
625 * If we want to use this data on the host for comparisons with some macros
626 * we must first transform it to _host_ endianess using target_buffer_get_u32().
627 */
628 current_instr = target_buffer_get_u32(target, (uint8_t *)&current_instr);
629
630 if (current_instr == MIPS32_SDBBP)
631 {
632 if ((retval = target_write_memory(target, breakpoint->address, 4, 1,
633 breakpoint->orig_instr)) != ERROR_OK)
634 {
635 return retval;
636 }
637 }
638 }
639 else
640 {
641 uint16_t current_instr;
642
643 /* check that user program has not modified breakpoint instruction */
644 if ((retval = target_read_memory(target, breakpoint->address, 2, 1,
645 (uint8_t*)&current_instr)) != ERROR_OK)
646 {
647 return retval;
648 }
649 current_instr = target_buffer_get_u16(target, (uint8_t *)&current_instr);
650 if (current_instr == MIPS16_SDBBP)
651 {
652 if ((retval = target_write_memory(target, breakpoint->address, 2, 1,
653 breakpoint->orig_instr)) != ERROR_OK)
654 {
655 return retval;
656 }
657 }
658 }
659 }
660 breakpoint->set = 0;
661
662 return ERROR_OK;
663 }
664
665 static int mips_m4k_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
666 {
667 struct mips32_common *mips32 = target_to_mips32(target);
668
669 if (breakpoint->type == BKPT_HARD)
670 {
671 if (mips32->num_inst_bpoints_avail < 1)
672 {
673 LOG_INFO("no hardware breakpoint available");
674 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
675 }
676
677 mips32->num_inst_bpoints_avail--;
678 }
679
680 return mips_m4k_set_breakpoint(target, breakpoint);
681 }
682
683 static int mips_m4k_remove_breakpoint(struct target *target,
684 struct breakpoint *breakpoint)
685 {
686 /* get pointers to arch-specific information */
687 struct mips32_common *mips32 = target_to_mips32(target);
688
689 if (target->state != TARGET_HALTED)
690 {
691 LOG_WARNING("target not halted");
692 return ERROR_TARGET_NOT_HALTED;
693 }
694
695 if (breakpoint->set)
696 {
697 mips_m4k_unset_breakpoint(target, breakpoint);
698 }
699
700 if (breakpoint->type == BKPT_HARD)
701 mips32->num_inst_bpoints_avail++;
702
703 return ERROR_OK;
704 }
705
706 static int mips_m4k_set_watchpoint(struct target *target,
707 struct watchpoint *watchpoint)
708 {
709 struct mips32_common *mips32 = target_to_mips32(target);
710 struct mips32_comparator *comparator_list = mips32->data_break_list;
711 int wp_num = 0;
712 /*
713 * watchpoint enabled, ignore all byte lanes in value register
714 * and exclude both load and store accesses from watchpoint
715 * condition evaluation
716 */
717 int enable = EJTAG_DBCn_NOSB | EJTAG_DBCn_NOLB | EJTAG_DBCn_BE |
718 (0xff << EJTAG_DBCn_BLM_SHIFT);
719
720 if (watchpoint->set)
721 {
722 LOG_WARNING("watchpoint already set");
723 return ERROR_OK;
724 }
725
726 while(comparator_list[wp_num].used && (wp_num < mips32->num_data_bpoints))
727 wp_num++;
728 if (wp_num >= mips32->num_data_bpoints)
729 {
730 LOG_ERROR("Can not find free FP Comparator");
731 return ERROR_FAIL;
732 }
733
734 if (watchpoint->length != 4)
735 {
736 LOG_ERROR("Only watchpoints of length 4 are supported");
737 return ERROR_TARGET_UNALIGNED_ACCESS;
738 }
739
740 if (watchpoint->address % 4)
741 {
742 LOG_ERROR("Watchpoints address should be word aligned");
743 return ERROR_TARGET_UNALIGNED_ACCESS;
744 }
745
746 switch (watchpoint->rw)
747 {
748 case WPT_READ:
749 enable &= ~EJTAG_DBCn_NOLB;
750 break;
751 case WPT_WRITE:
752 enable &= ~EJTAG_DBCn_NOSB;
753 break;
754 case WPT_ACCESS:
755 enable &= ~(EJTAG_DBCn_NOLB | EJTAG_DBCn_NOSB);
756 break;
757 default:
758 LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
759 }
760
761 watchpoint->set = wp_num + 1;
762 comparator_list[wp_num].used = 1;
763 comparator_list[wp_num].bp_value = watchpoint->address;
764 target_write_u32(target, comparator_list[wp_num].reg_address, comparator_list[wp_num].bp_value);
765 target_write_u32(target, comparator_list[wp_num].reg_address + 0x08, 0x00000000);
766 target_write_u32(target, comparator_list[wp_num].reg_address + 0x10, 0x00000000);
767 target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, enable);
768 target_write_u32(target, comparator_list[wp_num].reg_address + 0x20, 0);
769 LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "", wp_num, comparator_list[wp_num].bp_value);
770
771 return ERROR_OK;
772 }
773
774 static int mips_m4k_unset_watchpoint(struct target *target,
775 struct watchpoint *watchpoint)
776 {
777 /* get pointers to arch-specific information */
778 struct mips32_common *mips32 = target_to_mips32(target);
779 struct mips32_comparator *comparator_list = mips32->data_break_list;
780
781 if (!watchpoint->set)
782 {
783 LOG_WARNING("watchpoint not set");
784 return ERROR_OK;
785 }
786
787 int wp_num = watchpoint->set - 1;
788 if ((wp_num < 0) || (wp_num >= mips32->num_data_bpoints))
789 {
790 LOG_DEBUG("Invalid FP Comparator number in watchpoint");
791 return ERROR_OK;
792 }
793 comparator_list[wp_num].used = 0;
794 comparator_list[wp_num].bp_value = 0;
795 target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, 0);
796 watchpoint->set = 0;
797
798 return ERROR_OK;
799 }
800
801 static int mips_m4k_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
802 {
803 struct mips32_common *mips32 = target_to_mips32(target);
804
805 if (mips32->num_data_bpoints_avail < 1)
806 {
807 LOG_INFO("no hardware watchpoints available");
808 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
809 }
810
811 mips32->num_data_bpoints_avail--;
812
813 mips_m4k_set_watchpoint(target, watchpoint);
814 return ERROR_OK;
815 }
816
817 static int mips_m4k_remove_watchpoint(struct target *target,
818 struct watchpoint *watchpoint)
819 {
820 /* get pointers to arch-specific information */
821 struct mips32_common *mips32 = target_to_mips32(target);
822
823 if (target->state != TARGET_HALTED)
824 {
825 LOG_WARNING("target not halted");
826 return ERROR_TARGET_NOT_HALTED;
827 }
828
829 if (watchpoint->set)
830 {
831 mips_m4k_unset_watchpoint(target, watchpoint);
832 }
833
834 mips32->num_data_bpoints_avail++;
835
836 return ERROR_OK;
837 }
838
839 static void mips_m4k_enable_watchpoints(struct target *target)
840 {
841 struct watchpoint *watchpoint = target->watchpoints;
842
843 /* set any pending watchpoints */
844 while (watchpoint)
845 {
846 if (watchpoint->set == 0)
847 mips_m4k_set_watchpoint(target, watchpoint);
848 watchpoint = watchpoint->next;
849 }
850 }
851
852 static int mips_m4k_read_memory(struct target *target, uint32_t address,
853 uint32_t size, uint32_t count, uint8_t *buffer)
854 {
855 struct mips32_common *mips32 = target_to_mips32(target);
856 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
857
858 LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, size, count);
859
860 if (target->state != TARGET_HALTED)
861 {
862 LOG_WARNING("target not halted");
863 return ERROR_TARGET_NOT_HALTED;
864 }
865
866 /* sanitize arguments */
867 if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
868 return ERROR_INVALID_ARGUMENTS;
869
870 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
871 return ERROR_TARGET_UNALIGNED_ACCESS;
872
873 void * t = buffer;
874
875 /* if noDMA off, use DMAACC mode for memory read */
876 int retval;
877 if (ejtag_info->impcode & EJTAG_IMP_NODMA)
878 retval = mips32_pracc_read_mem(ejtag_info, address, size, count, t);
879 else
880 retval = mips32_dmaacc_read_mem(ejtag_info, address, size, count, t);
881
882 /* mips32_..._read_mem with size 4/2 returns uint32_t/uint16_t in host */
883 /* endianness, but byte array should represent target endianness */
884 if (ERROR_OK == retval)
885 {
886 switch(size)
887 {
888 case 4:
889 target_buffer_set_u32_array(target,buffer,count,t);
890 break;
891 case 2:
892 target_buffer_set_u16_array(target,buffer,count,t);
893 break;
894 }
895 }
896
897 return retval;
898 }
899
900 static int mips_m4k_write_memory(struct target *target, uint32_t address,
901 uint32_t size, uint32_t count, const uint8_t *buffer)
902 {
903 struct mips32_common *mips32 = target_to_mips32(target);
904 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
905
906 LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "",
907 address, size, count);
908
909 if (target->state != TARGET_HALTED)
910 {
911 LOG_WARNING("target not halted");
912 return ERROR_TARGET_NOT_HALTED;
913 }
914
915 /* sanitize arguments */
916 if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
917 return ERROR_INVALID_ARGUMENTS;
918
919 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
920 return ERROR_TARGET_UNALIGNED_ACCESS;
921
922 /** correct endianess if we have word or hword access */
923 void *t = NULL;
924 if (size > 1)
925 {
926 /* mips32_..._write_mem with size 4/2 requires uint32_t/uint16_t in host */
927 /* endianness, but byte array represents target endianness */
928 t = malloc(count * size * sizeof(uint8_t));
929 if (t == NULL)
930 {
931 LOG_ERROR("Out of memory");
932 return ERROR_FAIL;
933 }
934
935 switch(size)
936 {
937 case 4:
938 target_buffer_get_u32_array(target,buffer,count,(uint32_t*)t);
939 break;
940 case 2:
941 target_buffer_get_u16_array(target,buffer,count,(uint16_t*)t);
942 break;
943 }
944 buffer = t;
945 }
946
947 /* if noDMA off, use DMAACC mode for memory write */
948 int retval;
949 if (ejtag_info->impcode & EJTAG_IMP_NODMA)
950 retval = mips32_pracc_write_mem(ejtag_info, address, size, count, (void *)buffer);
951 else
952 retval = mips32_dmaacc_write_mem(ejtag_info, address, size, count, (void *)buffer);
953
954 if (t != NULL)
955 free(t);
956
957 if (ERROR_OK != retval)
958 return retval;
959
960 return ERROR_OK;
961 }
962
963 static int mips_m4k_init_target(struct command_context *cmd_ctx,
964 struct target *target)
965 {
966 mips32_build_reg_cache(target);
967
968 return ERROR_OK;
969 }
970
971 static int mips_m4k_init_arch_info(struct target *target,
972 struct mips_m4k_common *mips_m4k, struct jtag_tap *tap)
973 {
974 struct mips32_common *mips32 = &mips_m4k->mips32;
975
976 mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
977
978 /* initialize mips4k specific info */
979 mips32_init_arch_info(target, mips32, tap);
980 mips32->arch_info = mips_m4k;
981
982 return ERROR_OK;
983 }
984
985 static int mips_m4k_target_create(struct target *target, Jim_Interp *interp)
986 {
987 struct mips_m4k_common *mips_m4k = calloc(1, sizeof(struct mips_m4k_common));
988
989 mips_m4k_init_arch_info(target, mips_m4k, target->tap);
990
991 return ERROR_OK;
992 }
993
994 static int mips_m4k_examine(struct target *target)
995 {
996 int retval;
997 struct mips_m4k_common *mips_m4k = target_to_m4k(target);
998 struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
999 uint32_t idcode = 0;
1000
1001 if (!target_was_examined(target))
1002 {
1003 retval = mips_ejtag_get_idcode(ejtag_info, &idcode);
1004 if (retval != ERROR_OK)
1005 return retval;
1006 ejtag_info->idcode = idcode;
1007
1008 if (((idcode >> 1) & 0x7FF) == 0x29)
1009 {
1010 /* we are using a pic32mx so select ejtag port
1011 * as it is not selected by default */
1012 mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
1013 LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
1014 mips_m4k->is_pic32mx = true;
1015 }
1016 }
1017
1018 /* init rest of ejtag interface */
1019 if ((retval = mips_ejtag_init(ejtag_info)) != ERROR_OK)
1020 return retval;
1021
1022 if ((retval = mips32_examine(target)) != ERROR_OK)
1023 return retval;
1024
1025 return ERROR_OK;
1026 }
1027
1028 static int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
1029 uint32_t count, const uint8_t *buffer)
1030 {
1031 struct mips32_common *mips32 = target_to_mips32(target);
1032 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
1033 int retval;
1034 int write_t = 1;
1035
1036 LOG_DEBUG("address: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, count);
1037
1038 if (target->state != TARGET_HALTED)
1039 {
1040 LOG_WARNING("target not halted");
1041 return ERROR_TARGET_NOT_HALTED;
1042 }
1043
1044 /* check alignment */
1045 if (address & 0x3u)
1046 return ERROR_TARGET_UNALIGNED_ACCESS;
1047
1048 if (mips32->fast_data_area == NULL)
1049 {
1050 /* Get memory for block write handler
1051 * we preserve this area between calls and gain a speed increase
1052 * of about 3kb/sec when writing flash
1053 * this will be released/nulled by the system when the target is resumed or reset */
1054 retval = target_alloc_working_area(target,
1055 MIPS32_FASTDATA_HANDLER_SIZE,
1056 &mips32->fast_data_area);
1057 if (retval != ERROR_OK)
1058 {
1059 LOG_WARNING("No working area available, falling back to non-bulk write");
1060 return mips_m4k_write_memory(target, address, 4, count, buffer);
1061 }
1062
1063 /* reset fastadata state so the algo get reloaded */
1064 ejtag_info->fast_access_save = -1;
1065 }
1066
1067 /* mips32_pracc_fastdata_xfer requires uint32_t in host endianness, */
1068 /* but byte array represents target endianness */
1069 uint32_t *t = NULL;
1070 t = malloc(count * sizeof(uint32_t));
1071 if (t == NULL)
1072 {
1073 LOG_ERROR("Out of memory");
1074 return ERROR_FAIL;
1075 }
1076
1077 target_buffer_get_u32_array(target,buffer,count,t);
1078
1079 retval = mips32_pracc_fastdata_xfer(ejtag_info, mips32->fast_data_area, write_t, address,
1080 count, t);
1081
1082 if (t != NULL)
1083 free(t);
1084
1085 if (retval != ERROR_OK)
1086 {
1087 /* FASTDATA access failed, try normal memory write */
1088 LOG_DEBUG("Fastdata access Failed, falling back to non-bulk write");
1089 retval = mips_m4k_write_memory(target, address, 4, count, buffer);
1090 }
1091
1092 return retval;
1093 }
1094
1095 static int mips_m4k_verify_pointer(struct command_context *cmd_ctx,
1096 struct mips_m4k_common *mips_m4k)
1097 {
1098 if (mips_m4k->common_magic != MIPSM4K_COMMON_MAGIC) {
1099 command_print(cmd_ctx, "target is not an MIPS_M4K");
1100 return ERROR_TARGET_INVALID;
1101 }
1102 return ERROR_OK;
1103 }
1104
1105 COMMAND_HANDLER(mips_m4k_handle_cp0_command)
1106 {
1107 int retval;
1108 struct target *target = get_current_target(CMD_CTX);
1109 struct mips_m4k_common *mips_m4k = target_to_m4k(target);
1110 struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
1111
1112 retval = mips_m4k_verify_pointer(CMD_CTX, mips_m4k);
1113 if (retval != ERROR_OK)
1114 return retval;
1115
1116 if (target->state != TARGET_HALTED)
1117 {
1118 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
1119 return ERROR_OK;
1120 }
1121
1122 /* two or more argument, access a single register/select (write if third argument is given) */
1123 if (CMD_ARGC < 2)
1124 {
1125 command_print(CMD_CTX, "command requires more arguments.");
1126 }
1127 else
1128 {
1129 uint32_t cp0_reg, cp0_sel;
1130 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], cp0_reg);
1131 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], cp0_sel);
1132
1133 if (CMD_ARGC == 2)
1134 {
1135 uint32_t value;
1136
1137 if ((retval = mips32_cp0_read(ejtag_info, &value, cp0_reg, cp0_sel)) != ERROR_OK)
1138 {
1139 command_print(CMD_CTX,
1140 "couldn't access reg %" PRIi32,
1141 cp0_reg);
1142 return ERROR_OK;
1143 }
1144 if ((retval = jtag_execute_queue()) != ERROR_OK)
1145 {
1146 return retval;
1147 }
1148
1149 command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
1150 cp0_reg, cp0_sel, value);
1151 }
1152 else if (CMD_ARGC == 3)
1153 {
1154 uint32_t value;
1155 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], value);
1156 if ((retval = mips32_cp0_write(ejtag_info, value, cp0_reg, cp0_sel)) != ERROR_OK)
1157 {
1158 command_print(CMD_CTX,
1159 "couldn't access cp0 reg %" PRIi32 ", select %" PRIi32,
1160 cp0_reg, cp0_sel);
1161 return ERROR_OK;
1162 }
1163 command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
1164 cp0_reg, cp0_sel, value);
1165 }
1166 }
1167
1168 return ERROR_OK;
1169 }
1170
1171 static const struct command_registration mips_m4k_exec_command_handlers[] = {
1172 {
1173 .name = "cp0",
1174 .handler = mips_m4k_handle_cp0_command,
1175 .mode = COMMAND_EXEC,
1176 .usage = "regnum [value]",
1177 .help = "display/modify cp0 register",
1178 },
1179 COMMAND_REGISTRATION_DONE
1180 };
1181
1182 const struct command_registration mips_m4k_command_handlers[] = {
1183 {
1184 .chain = mips32_command_handlers,
1185 },
1186 {
1187 .name = "mips_m4k",
1188 .mode = COMMAND_ANY,
1189 .help = "mips_m4k command group",
1190 .chain = mips_m4k_exec_command_handlers,
1191 },
1192 COMMAND_REGISTRATION_DONE
1193 };
1194
1195 struct target_type mips_m4k_target =
1196 {
1197 .name = "mips_m4k",
1198
1199 .poll = mips_m4k_poll,
1200 .arch_state = mips32_arch_state,
1201
1202 .target_request_data = NULL,
1203
1204 .halt = mips_m4k_halt,
1205 .resume = mips_m4k_resume,
1206 .step = mips_m4k_step,
1207
1208 .assert_reset = mips_m4k_assert_reset,
1209 .deassert_reset = mips_m4k_deassert_reset,
1210 .soft_reset_halt = mips_m4k_soft_reset_halt,
1211
1212 .get_gdb_reg_list = mips32_get_gdb_reg_list,
1213
1214 .read_memory = mips_m4k_read_memory,
1215 .write_memory = mips_m4k_write_memory,
1216 .bulk_write_memory = mips_m4k_bulk_write_memory,
1217 .checksum_memory = mips32_checksum_memory,
1218 .blank_check_memory = mips32_blank_check_memory,
1219
1220 .run_algorithm = mips32_run_algorithm,
1221
1222 .add_breakpoint = mips_m4k_add_breakpoint,
1223 .remove_breakpoint = mips_m4k_remove_breakpoint,
1224 .add_watchpoint = mips_m4k_add_watchpoint,
1225 .remove_watchpoint = mips_m4k_remove_watchpoint,
1226
1227 .commands = mips_m4k_command_handlers,
1228 .target_create = mips_m4k_target_create,
1229 .init_target = mips_m4k_init_target,
1230 .examine = mips_m4k_examine,
1231 };
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