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armv7m: remove gdb register hacks
[openocd.git] / src / target / hla_target.c
blob2db04f8111aa6e9d5ea296550ed1eaafd501d9c7
1 /***************************************************************************
2 * Copyright (C) 2011 by Mathias Kuester *
3 * Mathias Kuester <kesmtp@freenet.de> *
4 * *
5 * Copyright (C) 2011 by Spencer Oliver *
6 * spen@spen-soft.co.uk *
7 * *
8 * revised: 4/25/13 by brent@mbari.org [DCC target request support] *
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 * This program is distributed in the hope that it will be useful, *
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
18 * GNU General Public License for more details. *
19 * *
20 * You should have received a copy of the GNU General Public License *
21 * along with this program; if not, write to the *
22 * Free Software Foundation, Inc., *
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
24 ***************************************************************************/
25
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include "jtag/jtag.h"
31 #include "jtag/hla/hla_transport.h"
32 #include "jtag/hla/hla_interface.h"
33 #include "jtag/hla/hla_layout.h"
34 #include "register.h"
35 #include "algorithm.h"
36 #include "target.h"
37 #include "breakpoints.h"
38 #include "target_type.h"
39 #include "armv7m.h"
40 #include "cortex_m.h"
41 #include "arm_semihosting.h"
42 #include "target_request.h"
43
44 #define savedDCRDR dbgbase /* FIXME: using target->dbgbase to preserve DCRDR */
45
46 #define ARMV7M_SCS_DCRSR DCB_DCRSR
47 #define ARMV7M_SCS_DCRDR DCB_DCRDR
48
49 static inline struct hl_interface_s *target_to_adapter(struct target *target)
50 {
51 return target->tap->priv;
52 }
53
54 static int adapter_load_core_reg_u32(struct target *target,
55 uint32_t num, uint32_t *value)
56 {
57 int retval;
58 struct hl_interface_s *adapter = target_to_adapter(target);
59
60 LOG_DEBUG("%s", __func__);
61
62 /* NOTE: we "know" here that the register identifiers used
63 * in the v7m header match the Cortex-M3 Debug Core Register
64 * Selector values for R0..R15, xPSR, MSP, and PSP.
65 */
66 switch (num) {
67 case 0 ... 18:
68 /* read a normal core register */
69 retval = adapter->layout->api->read_reg(adapter->fd, num, value);
70
71 if (retval != ERROR_OK) {
72 LOG_ERROR("JTAG failure %i", retval);
73 return ERROR_JTAG_DEVICE_ERROR;
74 }
75 LOG_DEBUG("load from core reg %i value 0x%" PRIx32 "", (int)num, *value);
76 break;
77
78 case ARMV7M_FPSID:
79 case ARMV7M_FPEXC:
80 *value = 0;
81 break;
82
83 case ARMV7M_FPSCR:
84 /* Floating-point Status and Registers */
85 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, 33);
86 if (retval != ERROR_OK)
87 return retval;
88 retval = target_read_u32(target, ARMV7M_SCS_DCRDR, value);
89 if (retval != ERROR_OK)
90 return retval;
91 LOG_DEBUG("load from core reg %i value 0x%" PRIx32 "", (int)num, *value);
92 break;
93
94 case ARMV7M_S0 ... ARMV7M_S31:
95 /* Floating-point Status and Registers */
96 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, num-ARMV7M_S0+64);
97 if (retval != ERROR_OK)
98 return retval;
99 retval = target_read_u32(target, ARMV7M_SCS_DCRDR, value);
100 if (retval != ERROR_OK)
101 return retval;
102 LOG_DEBUG("load from core reg %i value 0x%" PRIx32 "", (int)num, *value);
103 break;
104
105 case ARMV7M_D0 ... ARMV7M_D15:
106 value = 0;
107 break;
108
109 case ARMV7M_PRIMASK:
110 case ARMV7M_BASEPRI:
111 case ARMV7M_FAULTMASK:
112 case ARMV7M_CONTROL:
113 /* Cortex-M3 packages these four registers as bitfields
114 * in one Debug Core register. So say r0 and r2 docs;
115 * it was removed from r1 docs, but still works.
116 */
117 retval = adapter->layout->api->read_reg(adapter->fd, 20, value);
118 if (retval != ERROR_OK)
119 return retval;
120
121 switch (num) {
122 case ARMV7M_PRIMASK:
123 *value = buf_get_u32((uint8_t *) value, 0, 1);
124 break;
125
126 case ARMV7M_BASEPRI:
127 *value = buf_get_u32((uint8_t *) value, 8, 8);
128 break;
129
130 case ARMV7M_FAULTMASK:
131 *value = buf_get_u32((uint8_t *) value, 16, 1);
132 break;
133
134 case ARMV7M_CONTROL:
135 *value = buf_get_u32((uint8_t *) value, 24, 2);
136 break;
137 }
138
139 LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "",
140 (int)num, *value);
141 break;
142
143 default:
144 return ERROR_COMMAND_SYNTAX_ERROR;
145 }
146
147 return ERROR_OK;
148 }
149
150 static int adapter_store_core_reg_u32(struct target *target,
151 uint32_t num, uint32_t value)
152 {
153 int retval;
154 uint32_t reg;
155 struct armv7m_common *armv7m = target_to_armv7m(target);
156 struct hl_interface_s *adapter = target_to_adapter(target);
157
158 LOG_DEBUG("%s", __func__);
159
160 /* NOTE: we "know" here that the register identifiers used
161 * in the v7m header match the Cortex-M3 Debug Core Register
162 * Selector values for R0..R15, xPSR, MSP, and PSP.
163 */
164 switch (num) {
165 case 0 ... 18:
166 retval = adapter->layout->api->write_reg(adapter->fd, num, value);
167
168 if (retval != ERROR_OK) {
169 struct reg *r;
170
171 LOG_ERROR("JTAG failure");
172 r = armv7m->arm.core_cache->reg_list + num;
173 r->dirty = r->valid;
174 return ERROR_JTAG_DEVICE_ERROR;
175 }
176 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
177 break;
178
179 case ARMV7M_FPSID:
180 case ARMV7M_FPEXC:
181 break;
182
183 case ARMV7M_FPSCR:
184 /* Floating-point Status and Registers */
185 retval = target_write_u32(target, ARMV7M_SCS_DCRDR, value);
186 if (retval != ERROR_OK)
187 return retval;
188 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, 33 | (1<<16));
189 if (retval != ERROR_OK)
190 return retval;
191 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
192 break;
193
194 case ARMV7M_S0 ... ARMV7M_S31:
195 /* Floating-point Status and Registers */
196 retval = target_write_u32(target, ARMV7M_SCS_DCRDR, value);
197 if (retval != ERROR_OK)
198 return retval;
199 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, (num-ARMV7M_S0+64) | (1<<16));
200 if (retval != ERROR_OK)
201 return retval;
202 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
203 break;
204
205 case ARMV7M_D0 ... ARMV7M_D15:
206 break;
207
208 case ARMV7M_PRIMASK:
209 case ARMV7M_BASEPRI:
210 case ARMV7M_FAULTMASK:
211 case ARMV7M_CONTROL:
212 /* Cortex-M3 packages these four registers as bitfields
213 * in one Debug Core register. So say r0 and r2 docs;
214 * it was removed from r1 docs, but still works.
215 */
216
217 adapter->layout->api->read_reg(adapter->fd, 20, &reg);
218
219 switch (num) {
220 case ARMV7M_PRIMASK:
221 buf_set_u32((uint8_t *) &reg, 0, 1, value);
222 break;
223
224 case ARMV7M_BASEPRI:
225 buf_set_u32((uint8_t *) &reg, 8, 8, value);
226 break;
227
228 case ARMV7M_FAULTMASK:
229 buf_set_u32((uint8_t *) &reg, 16, 1, value);
230 break;
231
232 case ARMV7M_CONTROL:
233 buf_set_u32((uint8_t *) &reg, 24, 2, value);
234 break;
235 }
236
237 adapter->layout->api->write_reg(adapter->fd, 20, reg);
238
239 LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value);
240 break;
241
242 default:
243 return ERROR_COMMAND_SYNTAX_ERROR;
244 }
245
246 return ERROR_OK;
247 }
248
249 static int adapter_examine_debug_reason(struct target *target)
250 {
251 if ((target->debug_reason != DBG_REASON_DBGRQ)
252 && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
253 target->debug_reason = DBG_REASON_BREAKPOINT;
254 }
255
256 return ERROR_OK;
257 }
258
259 static int hl_dcc_read(struct hl_interface_s *hl_if, uint8_t *value, uint8_t *ctrl)
260 {
261 uint16_t dcrdr;
262 int retval = hl_if->layout->api->read_mem8(hl_if->fd,
263 DCB_DCRDR, sizeof(dcrdr), (uint8_t *)&dcrdr);
264 if (retval == ERROR_OK) {
265 *ctrl = (uint8_t)dcrdr;
266 *value = (uint8_t)(dcrdr >> 8);
267
268 LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
269
270 if (dcrdr & 1) {
271 /* write ack back to software dcc register
272 * to signify we have read data */
273 /* atomically clear just the byte containing the busy bit */
274 static const uint8_t zero;
275 retval = hl_if->layout->api->write_mem8(
276 hl_if->fd, DCB_DCRDR, 1, &zero);
277 }
278 }
279 return retval;
280 }
281
282 static int hl_target_request_data(struct target *target,
283 uint32_t size, uint8_t *buffer)
284 {
285 struct hl_interface_s *hl_if = target_to_adapter(target);
286 uint8_t data;
287 uint8_t ctrl;
288 uint32_t i;
289
290 for (i = 0; i < (size * 4); i++) {
291 hl_dcc_read(hl_if, &data, &ctrl);
292 buffer[i] = data;
293 }
294
295 return ERROR_OK;
296 }
297
298 static int hl_handle_target_request(void *priv)
299 {
300 struct target *target = priv;
301 if (!target_was_examined(target))
302 return ERROR_OK;
303 struct hl_interface_s *hl_if = target_to_adapter(target);
304
305 if (!target->dbg_msg_enabled)
306 return ERROR_OK;
307
308 if (target->state == TARGET_RUNNING) {
309 uint8_t data;
310 uint8_t ctrl;
311
312 hl_dcc_read(hl_if, &data, &ctrl);
313
314 /* check if we have data */
315 if (ctrl & (1 << 0)) {
316 uint32_t request;
317
318 /* we assume target is quick enough */
319 request = data;
320 hl_dcc_read(hl_if, &data, &ctrl);
321 request |= (data << 8);
322 hl_dcc_read(hl_if, &data, &ctrl);
323 request |= (data << 16);
324 hl_dcc_read(hl_if, &data, &ctrl);
325 request |= (data << 24);
326 target_request(target, request);
327 }
328 }
329
330 return ERROR_OK;
331 }
332
333 static int adapter_init_arch_info(struct target *target,
334 struct cortex_m3_common *cortex_m3,
335 struct jtag_tap *tap)
336 {
337 struct armv7m_common *armv7m;
338
339 LOG_DEBUG("%s", __func__);
340
341 armv7m = &cortex_m3->armv7m;
342 armv7m_init_arch_info(target, armv7m);
343
344 armv7m->load_core_reg_u32 = adapter_load_core_reg_u32;
345 armv7m->store_core_reg_u32 = adapter_store_core_reg_u32;
346
347 armv7m->examine_debug_reason = adapter_examine_debug_reason;
348 armv7m->stlink = true;
349
350 target_register_timer_callback(hl_handle_target_request, 1, 1, target);
351
352 return ERROR_OK;
353 }
354
355 static int adapter_init_target(struct command_context *cmd_ctx,
356 struct target *target)
357 {
358 LOG_DEBUG("%s", __func__);
359
360 armv7m_build_reg_cache(target);
361
362 return ERROR_OK;
363 }
364
365 static int adapter_target_create(struct target *target,
366 Jim_Interp *interp)
367 {
368 LOG_DEBUG("%s", __func__);
369
370 struct cortex_m3_common *cortex_m3 = calloc(1, sizeof(struct cortex_m3_common));
371
372 if (!cortex_m3)
373 return ERROR_COMMAND_SYNTAX_ERROR;
374
375 adapter_init_arch_info(target, cortex_m3, target->tap);
376
377 return ERROR_OK;
378 }
379
380 static int adapter_load_context(struct target *target)
381 {
382 struct armv7m_common *armv7m = target_to_armv7m(target);
383 int num_regs = armv7m->arm.core_cache->num_regs;
384
385 for (int i = 0; i < num_regs; i++) {
386
387 struct reg *r = &armv7m->arm.core_cache->reg_list[i];
388 if (!r->valid)
389 armv7m->arm.read_core_reg(target, r, i, ARM_MODE_ANY);
390 }
391
392 return ERROR_OK;
393 }
394
395 static int adapter_debug_entry(struct target *target)
396 {
397 struct hl_interface_s *adapter = target_to_adapter(target);
398 struct armv7m_common *armv7m = target_to_armv7m(target);
399 struct arm *arm = &armv7m->arm;
400 struct reg *r;
401 uint32_t xPSR;
402 int retval;
403
404 /* preserve the DCRDR across halts */
405 retval = target_read_u32(target, DCB_DCRDR, &target->savedDCRDR);
406 if (retval != ERROR_OK)
407 return retval;
408
409 retval = armv7m->examine_debug_reason(target);
410 if (retval != ERROR_OK)
411 return retval;
412
413 adapter_load_context(target);
414
415 /* make sure we clear the vector catch bit */
416 adapter->layout->api->write_debug_reg(adapter->fd, DCB_DEMCR, TRCENA);
417
418 r = arm->cpsr;
419 xPSR = buf_get_u32(r->value, 0, 32);
420
421 /* Are we in an exception handler */
422 if (xPSR & 0x1FF) {
423 armv7m->exception_number = (xPSR & 0x1FF);
424
425 arm->core_mode = ARM_MODE_HANDLER;
426 arm->map = armv7m_msp_reg_map;
427 } else {
428 unsigned control = buf_get_u32(arm->core_cache
429 ->reg_list[ARMV7M_CONTROL].value, 0, 2);
430
431 /* is this thread privileged? */
432 arm->core_mode = control & 1
433 ? ARM_MODE_USER_THREAD
434 : ARM_MODE_THREAD;
435
436 /* which stack is it using? */
437 if (control & 2)
438 arm->map = armv7m_psp_reg_map;
439 else
440 arm->map = armv7m_msp_reg_map;
441
442 armv7m->exception_number = 0;
443 }
444
445 LOG_DEBUG("entered debug state in core mode: %s at PC 0x%08" PRIx32 ", target->state: %s",
446 arm_mode_name(arm->core_mode),
447 *(uint32_t *)(arm->pc->value),
448 target_state_name(target));
449
450 return retval;
451 }
452
453 static int adapter_poll(struct target *target)
454 {
455 enum target_state state;
456 struct hl_interface_s *adapter = target_to_adapter(target);
457 struct armv7m_common *armv7m = target_to_armv7m(target);
458 enum target_state prev_target_state = target->state;
459
460 state = adapter->layout->api->state(adapter->fd);
461
462 if (state == TARGET_UNKNOWN) {
463 LOG_ERROR("jtag status contains invalid mode value - communication failure");
464 return ERROR_TARGET_FAILURE;
465 }
466
467 if (target->state == state)
468 return ERROR_OK;
469
470 if (state == TARGET_HALTED) {
471 target->state = state;
472
473 int retval = adapter_debug_entry(target);
474 if (retval != ERROR_OK)
475 return retval;
476
477 if (prev_target_state == TARGET_DEBUG_RUNNING) {
478 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
479 } else {
480 if (arm_semihosting(target, &retval) != 0)
481 return retval;
482
483 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
484 }
485
486 LOG_DEBUG("halted: PC: 0x%08x", buf_get_u32(armv7m->arm.pc->value, 0, 32));
487 }
488
489 return ERROR_OK;
490 }
491
492 static int adapter_assert_reset(struct target *target)
493 {
494 int res = ERROR_OK;
495 struct hl_interface_s *adapter = target_to_adapter(target);
496 struct armv7m_common *armv7m = target_to_armv7m(target);
497 bool use_srst_fallback = true;
498
499 LOG_DEBUG("%s", __func__);
500
501 enum reset_types jtag_reset_config = jtag_get_reset_config();
502
503 bool srst_asserted = false;
504
505 if ((jtag_reset_config & RESET_HAS_SRST) &&
506 (jtag_reset_config & RESET_SRST_NO_GATING)) {
507 jtag_add_reset(0, 1);
508 res = adapter->layout->api->assert_srst(adapter->fd, 0);
509 srst_asserted = true;
510 }
511
512 adapter->layout->api->write_debug_reg(adapter->fd, DCB_DHCSR, DBGKEY|C_DEBUGEN);
513
514 /* only set vector catch if halt is requested */
515 if (target->reset_halt)
516 adapter->layout->api->write_debug_reg(adapter->fd, DCB_DEMCR, TRCENA|VC_CORERESET);
517 else
518 adapter->layout->api->write_debug_reg(adapter->fd, DCB_DEMCR, TRCENA);
519
520 if (jtag_reset_config & RESET_HAS_SRST) {
521 if (!srst_asserted) {
522 jtag_add_reset(0, 1);
523 res = adapter->layout->api->assert_srst(adapter->fd, 0);
524 }
525 if (res == ERROR_COMMAND_NOTFOUND)
526 LOG_ERROR("Hardware srst not supported, falling back to software reset");
527 else if (res == ERROR_OK) {
528 /* hardware srst supported */
529 use_srst_fallback = false;
530 }
531 }
532
533 if (use_srst_fallback) {
534 /* stlink v1 api does not support hardware srst, so we use a software reset fallback */
535 adapter->layout->api->write_debug_reg(adapter->fd, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ);
536 }
537
538 res = adapter->layout->api->reset(adapter->fd);
539
540 if (res != ERROR_OK)
541 return res;
542
543 /* registers are now invalid */
544 register_cache_invalidate(armv7m->arm.core_cache);
545
546 if (target->reset_halt) {
547 target->state = TARGET_RESET;
548 target->debug_reason = DBG_REASON_DBGRQ;
549 } else {
550 target->state = TARGET_HALTED;
551 }
552
553 return ERROR_OK;
554 }
555
556 static int adapter_deassert_reset(struct target *target)
557 {
558 struct hl_interface_s *adapter = target_to_adapter(target);
559
560 enum reset_types jtag_reset_config = jtag_get_reset_config();
561
562 LOG_DEBUG("%s", __func__);
563
564 if (jtag_reset_config & RESET_HAS_SRST)
565 adapter->layout->api->assert_srst(adapter->fd, 1);
566
567 /* virtual deassert reset, we need it for the internal
568 * jtag state machine
569 */
570 jtag_add_reset(0, 0);
571
572 target->savedDCRDR = 0; /* clear both DCC busy bits on initial resume */
573
574 return target->reset_halt ? ERROR_OK : target_resume(target, 1, 0, 0, 0);
575 }
576
577 static int adapter_halt(struct target *target)
578 {
579 int res;
580 struct hl_interface_s *adapter = target_to_adapter(target);
581
582 LOG_DEBUG("%s", __func__);
583
584 if (target->state == TARGET_HALTED) {
585 LOG_DEBUG("target was already halted");
586 return ERROR_OK;
587 }
588
589 if (target->state == TARGET_UNKNOWN)
590 LOG_WARNING("target was in unknown state when halt was requested");
591
592 res = adapter->layout->api->halt(adapter->fd);
593
594 if (res != ERROR_OK)
595 return res;
596
597 target->debug_reason = DBG_REASON_DBGRQ;
598
599 return ERROR_OK;
600 }
601
602 static int adapter_resume(struct target *target, int current,
603 uint32_t address, int handle_breakpoints,
604 int debug_execution)
605 {
606 int res;
607 struct hl_interface_s *adapter = target_to_adapter(target);
608 struct armv7m_common *armv7m = target_to_armv7m(target);
609 uint32_t resume_pc;
610 struct breakpoint *breakpoint = NULL;
611 struct reg *pc;
612
613 LOG_DEBUG("%s %d 0x%08x %d %d", __func__, current, address,
614 handle_breakpoints, debug_execution);
615
616 if (target->state != TARGET_HALTED) {
617 LOG_WARNING("target not halted");
618 return ERROR_TARGET_NOT_HALTED;
619 }
620
621 if (!debug_execution) {
622 target_free_all_working_areas(target);
623 cortex_m3_enable_breakpoints(target);
624 cortex_m3_enable_watchpoints(target);
625 }
626
627 pc = armv7m->arm.pc;
628 if (!current) {
629 buf_set_u32(pc->value, 0, 32, address);
630 pc->dirty = true;
631 pc->valid = true;
632 }
633
634 if (!breakpoint_find(target, buf_get_u32(pc->value, 0, 32))
635 && !debug_execution) {
636 armv7m_maybe_skip_bkpt_inst(target, NULL);
637 }
638
639 resume_pc = buf_get_u32(pc->value, 0, 32);
640
641 /* write any user vector flags */
642 res = target_write_u32(target, DCB_DEMCR, TRCENA | armv7m->demcr);
643 if (res != ERROR_OK)
644 return res;
645
646 armv7m_restore_context(target);
647
648 /* restore savedDCRDR */
649 res = target_write_u32(target, DCB_DCRDR, target->savedDCRDR);
650 if (res != ERROR_OK)
651 return res;
652
653 /* registers are now invalid */
654 register_cache_invalidate(armv7m->arm.core_cache);
655
656 /* the front-end may request us not to handle breakpoints */
657 if (handle_breakpoints) {
658 /* Single step past breakpoint at current address */
659 breakpoint = breakpoint_find(target, resume_pc);
660 if (breakpoint) {
661 LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 " (ID: %d)",
662 breakpoint->address,
663 breakpoint->unique_id);
664 cortex_m3_unset_breakpoint(target, breakpoint);
665
666 res = adapter->layout->api->step(adapter->fd);
667
668 if (res != ERROR_OK)
669 return res;
670
671 cortex_m3_set_breakpoint(target, breakpoint);
672 }
673 }
674
675 res = adapter->layout->api->run(adapter->fd);
676
677 if (res != ERROR_OK)
678 return res;
679
680 target->debug_reason = DBG_REASON_NOTHALTED;
681
682 if (!debug_execution) {
683 target->state = TARGET_RUNNING;
684 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
685 } else {
686 target->state = TARGET_DEBUG_RUNNING;
687 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
688 }
689
690 return ERROR_OK;
691 }
692
693 static int adapter_step(struct target *target, int current,
694 uint32_t address, int handle_breakpoints)
695 {
696 int res;
697 struct hl_interface_s *adapter = target_to_adapter(target);
698 struct armv7m_common *armv7m = target_to_armv7m(target);
699 struct breakpoint *breakpoint = NULL;
700 struct reg *pc = armv7m->arm.pc;
701 bool bkpt_inst_found = false;
702
703 LOG_DEBUG("%s", __func__);
704
705 if (target->state != TARGET_HALTED) {
706 LOG_WARNING("target not halted");
707 return ERROR_TARGET_NOT_HALTED;
708 }
709
710 if (!current) {
711 buf_set_u32(pc->value, 0, 32, address);
712 pc->dirty = true;
713 pc->valid = true;
714 }
715
716 uint32_t pc_value = buf_get_u32(pc->value, 0, 32);
717
718 /* the front-end may request us not to handle breakpoints */
719 if (handle_breakpoints) {
720 breakpoint = breakpoint_find(target, pc_value);
721 if (breakpoint)
722 cortex_m3_unset_breakpoint(target, breakpoint);
723 }
724
725 armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found);
726
727 target->debug_reason = DBG_REASON_SINGLESTEP;
728
729 armv7m_restore_context(target);
730
731 /* restore savedDCRDR */
732 res = target_write_u32(target, DCB_DCRDR, target->savedDCRDR);
733 if (res != ERROR_OK)
734 return res;
735
736 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
737
738 res = adapter->layout->api->step(adapter->fd);
739
740 if (res != ERROR_OK)
741 return res;
742
743 /* registers are now invalid */
744 register_cache_invalidate(armv7m->arm.core_cache);
745
746 if (breakpoint)
747 cortex_m3_set_breakpoint(target, breakpoint);
748
749 adapter_debug_entry(target);
750 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
751
752 LOG_INFO("halted: PC: 0x%08x", buf_get_u32(armv7m->arm.pc->value, 0, 32));
753
754 return ERROR_OK;
755 }
756
757 static int adapter_read_memory(struct target *target, uint32_t address,
758 uint32_t size, uint32_t count,
759 uint8_t *buffer)
760 {
761 struct hl_interface_s *adapter = target_to_adapter(target);
762 int res;
763 uint32_t buffer_threshold = (adapter->param.max_buffer / 4);
764 uint32_t addr_increment = 4;
765 uint32_t c;
766
767 if (!count || !buffer)
768 return ERROR_COMMAND_SYNTAX_ERROR;
769
770 LOG_DEBUG("%s 0x%08x %d %d", __func__, address, size, count);
771
772 /* prepare byte count, buffer threshold
773 * and address increment for none 32bit access
774 */
775 if (size != 4) {
776 count *= size;
777 buffer_threshold = (adapter->param.max_buffer / 4) / 2;
778 addr_increment = 1;
779 }
780
781 while (count) {
782 if (count > buffer_threshold)
783 c = buffer_threshold;
784 else
785 c = count;
786
787 if (size != 4)
788 res = adapter->layout->api->read_mem8(adapter->fd,
789 address, c, buffer);
790 else
791 res = adapter->layout->api->read_mem32(adapter->fd,
792 address, c, buffer);
793
794 if (res != ERROR_OK)
795 return res;
796
797 address += (c * addr_increment);
798 buffer += (c * addr_increment);
799 count -= c;
800 }
801
802 return ERROR_OK;
803 }
804
805 static int adapter_write_memory(struct target *target, uint32_t address,
806 uint32_t size, uint32_t count,
807 const uint8_t *buffer)
808 {
809 struct hl_interface_s *adapter = target_to_adapter(target);
810 int res;
811 uint32_t buffer_threshold = (adapter->param.max_buffer / 4);
812 uint32_t addr_increment = 4;
813 uint32_t c;
814
815 if (!count || !buffer)
816 return ERROR_COMMAND_SYNTAX_ERROR;
817
818 LOG_DEBUG("%s 0x%08x %d %d", __func__, address, size, count);
819
820 /* prepare byte count, buffer threshold
821 * and address increment for none 32bit access
822 */
823 if (size != 4) {
824 count *= size;
825 buffer_threshold = (adapter->param.max_buffer / 4) / 2;
826 addr_increment = 1;
827 }
828
829 while (count) {
830 if (count > buffer_threshold)
831 c = buffer_threshold;
832 else
833 c = count;
834
835 if (size != 4)
836 res = adapter->layout->api->write_mem8(adapter->fd,
837 address, c, buffer);
838 else
839 res = adapter->layout->api->write_mem32(adapter->fd,
840 address, c, buffer);
841
842 if (res != ERROR_OK)
843 return res;
844
845 address += (c * addr_increment);
846 buffer += (c * addr_increment);
847 count -= c;
848 }
849
850 return ERROR_OK;
851 }
852
853 static const struct command_registration adapter_command_handlers[] = {
854 {
855 .chain = arm_command_handlers,
856 },
857 COMMAND_REGISTRATION_DONE
858 };
859
860 struct target_type hla_target = {
861 .name = "hla_target",
862 .deprecated_name = "stm32_stlink",
863
864 .init_target = adapter_init_target,
865 .target_create = adapter_target_create,
866 .examine = cortex_m3_examine,
867 .commands = adapter_command_handlers,
868
869 .poll = adapter_poll,
870 .arch_state = armv7m_arch_state,
871
872 .target_request_data = hl_target_request_data,
873 .assert_reset = adapter_assert_reset,
874 .deassert_reset = adapter_deassert_reset,
875
876 .halt = adapter_halt,
877 .resume = adapter_resume,
878 .step = adapter_step,
879
880 .get_gdb_reg_list = armv7m_get_gdb_reg_list,
881
882 .read_memory = adapter_read_memory,
883 .write_memory = adapter_write_memory,
884 .checksum_memory = armv7m_checksum_memory,
885 .blank_check_memory = armv7m_blank_check_memory,
886
887 .run_algorithm = armv7m_run_algorithm,
888 .start_algorithm = armv7m_start_algorithm,
889 .wait_algorithm = armv7m_wait_algorithm,
890
891 .add_breakpoint = cortex_m3_add_breakpoint,
892 .remove_breakpoint = cortex_m3_remove_breakpoint,
893 .add_watchpoint = cortex_m3_add_watchpoint,
894 .remove_watchpoint = cortex_m3_remove_watchpoint,
895 };
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