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target/aarch64: Call aarch64_init_debug_access() earlier in aarch64_deassert_reset()
[openocd.git] / src / target / armv8_dpm.c
blob3c941fa2db17b97f09683dcdaee1c9675d4a164d
1 /*
2 * Copyright (C) 2009 by David Brownell
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #ifdef HAVE_CONFIG_H
17 #include "config.h"
18 #endif
19
20 #include "arm.h"
21 #include "armv8.h"
22 #include "armv8_dpm.h"
23 #include <jtag/jtag.h>
24 #include "register.h"
25 #include "breakpoints.h"
26 #include "target_type.h"
27 #include "armv8_opcodes.h"
28
29 #include "helper/time_support.h"
30
31 /* T32 ITR format */
32 #define T32_FMTITR(instr) (((instr & 0x0000FFFF) << 16) | ((instr & 0xFFFF0000) >> 16))
33
34 /**
35 * @file
36 * Implements various ARM DPM operations using architectural debug registers.
37 * These routines layer over core-specific communication methods to cope with
38 * implementation differences between cores like ARM1136 and Cortex-A8.
39 *
40 * The "Debug Programmers' Model" (DPM) for ARMv6 and ARMv7 is defined by
41 * Part C (Debug Architecture) of the ARM Architecture Reference Manual,
42 * ARMv7-A and ARMv7-R edition (ARM DDI 0406B). In OpenOCD, DPM operations
43 * are abstracted through internal programming interfaces to share code and
44 * to minimize needless differences in debug behavior between cores.
45 */
46
47 /**
48 * Get core state from EDSCR, without necessity to retrieve CPSR
49 */
50 enum arm_state armv8_dpm_get_core_state(struct arm_dpm *dpm)
51 {
52 int el = (dpm->dscr >> 8) & 0x3;
53 int rw = (dpm->dscr >> 10) & 0xF;
54
55 dpm->last_el = el;
56
57 /* In Debug state, each bit gives the current Execution state of each EL */
58 if ((rw >> el) & 0b1)
59 return ARM_STATE_AARCH64;
60
61 return ARM_STATE_ARM;
62 }
63
64 /*----------------------------------------------------------------------*/
65
66 static int dpmv8_write_dcc(struct armv8_common *armv8, uint32_t data)
67 {
68 return mem_ap_write_u32(armv8->debug_ap,
69 armv8->debug_base + CPUV8_DBG_DTRRX, data);
70 }
71
72 static int dpmv8_write_dcc_64(struct armv8_common *armv8, uint64_t data)
73 {
74 int ret;
75 ret = mem_ap_write_u32(armv8->debug_ap,
76 armv8->debug_base + CPUV8_DBG_DTRRX, data);
77 if (ret == ERROR_OK)
78 ret = mem_ap_write_u32(armv8->debug_ap,
79 armv8->debug_base + CPUV8_DBG_DTRTX, data >> 32);
80 return ret;
81 }
82
83 static int dpmv8_read_dcc(struct armv8_common *armv8, uint32_t *data,
84 uint32_t *dscr_p)
85 {
86 uint32_t dscr = DSCR_ITE;
87 int retval;
88
89 if (dscr_p)
90 dscr = *dscr_p;
91
92 /* Wait for DTRRXfull */
93 long long then = timeval_ms();
94 while ((dscr & DSCR_DTR_TX_FULL) == 0) {
95 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
96 armv8->debug_base + CPUV8_DBG_DSCR,
97 &dscr);
98 if (retval != ERROR_OK)
99 return retval;
100 if (timeval_ms() > then + 1000) {
101 LOG_ERROR("Timeout waiting for read dcc");
102 return ERROR_FAIL;
103 }
104 }
105
106 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
107 armv8->debug_base + CPUV8_DBG_DTRTX,
108 data);
109 if (retval != ERROR_OK)
110 return retval;
111
112 if (dscr_p)
113 *dscr_p = dscr;
114
115 return retval;
116 }
117
118 static int dpmv8_read_dcc_64(struct armv8_common *armv8, uint64_t *data,
119 uint32_t *dscr_p)
120 {
121 uint32_t dscr = DSCR_ITE;
122 uint32_t higher;
123 int retval;
124
125 if (dscr_p)
126 dscr = *dscr_p;
127
128 /* Wait for DTRRXfull */
129 long long then = timeval_ms();
130 while ((dscr & DSCR_DTR_TX_FULL) == 0) {
131 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
132 armv8->debug_base + CPUV8_DBG_DSCR,
133 &dscr);
134 if (retval != ERROR_OK)
135 return retval;
136 if (timeval_ms() > then + 1000) {
137 LOG_ERROR("Timeout waiting for DTR_TX_FULL, dscr = 0x%08" PRIx32, dscr);
138 return ERROR_FAIL;
139 }
140 }
141
142 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
143 armv8->debug_base + CPUV8_DBG_DTRTX,
144 (uint32_t *)data);
145 if (retval != ERROR_OK)
146 return retval;
147
148 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
149 armv8->debug_base + CPUV8_DBG_DTRRX,
150 &higher);
151 if (retval != ERROR_OK)
152 return retval;
153
154 *data = *(uint32_t *)data | (uint64_t)higher << 32;
155
156 if (dscr_p)
157 *dscr_p = dscr;
158
159 return retval;
160 }
161
162 static int dpmv8_dpm_prepare(struct arm_dpm *dpm)
163 {
164 struct armv8_common *armv8 = dpm->arm->arch_info;
165 uint32_t dscr;
166 int retval;
167
168 /* set up invariant: ITE is set after ever DPM operation */
169 long long then = timeval_ms();
170 for (;; ) {
171 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
172 armv8->debug_base + CPUV8_DBG_DSCR,
173 &dscr);
174 if (retval != ERROR_OK)
175 return retval;
176 if ((dscr & DSCR_ITE) != 0)
177 break;
178 if (timeval_ms() > then + 1000) {
179 LOG_ERROR("Timeout waiting for dpm prepare");
180 return ERROR_FAIL;
181 }
182 }
183
184 /* update the stored copy of dscr */
185 dpm->dscr = dscr;
186
187 /* this "should never happen" ... */
188 if (dscr & DSCR_DTR_RX_FULL) {
189 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
190 /* Clear DCCRX */
191 retval = mem_ap_read_u32(armv8->debug_ap,
192 armv8->debug_base + CPUV8_DBG_DTRRX, &dscr);
193 if (retval != ERROR_OK)
194 return retval;
195 }
196
197 return retval;
198 }
199
200 static int dpmv8_dpm_finish(struct arm_dpm *dpm)
201 {
202 /* REVISIT what could be done here? */
203 return ERROR_OK;
204 }
205
206 static int dpmv8_exec_opcode(struct arm_dpm *dpm,
207 uint32_t opcode, uint32_t *p_dscr)
208 {
209 struct armv8_common *armv8 = dpm->arm->arch_info;
210 uint32_t dscr = dpm->dscr;
211 int retval;
212
213 if (p_dscr)
214 dscr = *p_dscr;
215
216 /* Wait for InstrCompl bit to be set */
217 long long then = timeval_ms();
218 while ((dscr & DSCR_ITE) == 0) {
219 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
220 armv8->debug_base + CPUV8_DBG_DSCR, &dscr);
221 if (retval != ERROR_OK) {
222 LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode);
223 return retval;
224 }
225 if (timeval_ms() > then + 1000) {
226 LOG_ERROR("Timeout waiting for aarch64_exec_opcode");
227 return ERROR_FAIL;
228 }
229 }
230
231 if (armv8_dpm_get_core_state(dpm) != ARM_STATE_AARCH64)
232 opcode = T32_FMTITR(opcode);
233
234 retval = mem_ap_write_u32(armv8->debug_ap,
235 armv8->debug_base + CPUV8_DBG_ITR, opcode);
236 if (retval != ERROR_OK)
237 return retval;
238
239 then = timeval_ms();
240 do {
241 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
242 armv8->debug_base + CPUV8_DBG_DSCR, &dscr);
243 if (retval != ERROR_OK) {
244 LOG_ERROR("Could not read DSCR register");
245 return retval;
246 }
247 if (timeval_ms() > then + 1000) {
248 LOG_ERROR("Timeout waiting for aarch64_exec_opcode");
249 return ERROR_FAIL;
250 }
251 } while ((dscr & DSCR_ITE) == 0); /* Wait for InstrCompl bit to be set */
252
253 /* update dscr and el after each command execution */
254 dpm->dscr = dscr;
255 if (dpm->last_el != ((dscr >> 8) & 3))
256 LOG_DEBUG("EL %i -> %i", dpm->last_el, (dscr >> 8) & 3);
257 dpm->last_el = (dscr >> 8) & 3;
258
259 if (dscr & DSCR_ERR) {
260 LOG_ERROR("Opcode 0x%08"PRIx32", DSCR.ERR=1, DSCR.EL=%i", opcode, dpm->last_el);
261 armv8_dpm_handle_exception(dpm, true);
262 retval = ERROR_FAIL;
263 }
264
265 if (p_dscr)
266 *p_dscr = dscr;
267
268 return retval;
269 }
270
271 static int dpmv8_instr_execute(struct arm_dpm *dpm, uint32_t opcode)
272 {
273 return dpmv8_exec_opcode(dpm, opcode, NULL);
274 }
275
276 static int dpmv8_instr_write_data_dcc(struct arm_dpm *dpm,
277 uint32_t opcode, uint32_t data)
278 {
279 struct armv8_common *armv8 = dpm->arm->arch_info;
280 int retval;
281
282 retval = dpmv8_write_dcc(armv8, data);
283 if (retval != ERROR_OK)
284 return retval;
285
286 return dpmv8_exec_opcode(dpm, opcode, 0);
287 }
288
289 static int dpmv8_instr_write_data_dcc_64(struct arm_dpm *dpm,
290 uint32_t opcode, uint64_t data)
291 {
292 struct armv8_common *armv8 = dpm->arm->arch_info;
293 int retval;
294
295 retval = dpmv8_write_dcc_64(armv8, data);
296 if (retval != ERROR_OK)
297 return retval;
298
299 return dpmv8_exec_opcode(dpm, opcode, 0);
300 }
301
302 static int dpmv8_instr_write_data_r0(struct arm_dpm *dpm,
303 uint32_t opcode, uint32_t data)
304 {
305 struct armv8_common *armv8 = dpm->arm->arch_info;
306 uint32_t dscr = DSCR_ITE;
307 int retval;
308
309 retval = dpmv8_write_dcc(armv8, data);
310 if (retval != ERROR_OK)
311 return retval;
312
313 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, READ_REG_DTRRX), &dscr);
314 if (retval != ERROR_OK)
315 return retval;
316
317 /* then the opcode, taking data from R0 */
318 return dpmv8_exec_opcode(dpm, opcode, &dscr);
319 }
320
321 static int dpmv8_instr_write_data_r0_64(struct arm_dpm *dpm,
322 uint32_t opcode, uint64_t data)
323 {
324 struct armv8_common *armv8 = dpm->arm->arch_info;
325 int retval;
326
327 if (dpm->arm->core_state != ARM_STATE_AARCH64)
328 return dpmv8_instr_write_data_r0(dpm, opcode, data);
329
330 /* transfer data from DCC to R0 */
331 retval = dpmv8_write_dcc_64(armv8, data);
332 if (retval == ERROR_OK)
333 retval = dpmv8_exec_opcode(dpm, ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dpm->dscr);
334
335 /* then the opcode, taking data from R0 */
336 if (retval == ERROR_OK)
337 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
338
339 return retval;
340 }
341
342 static int dpmv8_instr_cpsr_sync(struct arm_dpm *dpm)
343 {
344 int retval;
345 struct armv8_common *armv8 = dpm->arm->arch_info;
346
347 /* "Prefetch flush" after modifying execution status in CPSR */
348 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, ARMV8_OPC_DSB_SY), &dpm->dscr);
349 if (retval == ERROR_OK)
350 dpmv8_exec_opcode(dpm, armv8_opcode(armv8, ARMV8_OPC_ISB_SY), &dpm->dscr);
351 return retval;
352 }
353
354 static int dpmv8_instr_read_data_dcc(struct arm_dpm *dpm,
355 uint32_t opcode, uint32_t *data)
356 {
357 struct armv8_common *armv8 = dpm->arm->arch_info;
358 int retval;
359
360 /* the opcode, writing data to DCC */
361 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
362 if (retval != ERROR_OK)
363 return retval;
364
365 return dpmv8_read_dcc(armv8, data, &dpm->dscr);
366 }
367
368 static int dpmv8_instr_read_data_dcc_64(struct arm_dpm *dpm,
369 uint32_t opcode, uint64_t *data)
370 {
371 struct armv8_common *armv8 = dpm->arm->arch_info;
372 int retval;
373
374 /* the opcode, writing data to DCC */
375 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
376 if (retval != ERROR_OK)
377 return retval;
378
379 return dpmv8_read_dcc_64(armv8, data, &dpm->dscr);
380 }
381
382 static int dpmv8_instr_read_data_r0(struct arm_dpm *dpm,
383 uint32_t opcode, uint32_t *data)
384 {
385 struct armv8_common *armv8 = dpm->arm->arch_info;
386 int retval;
387
388 /* the opcode, writing data to R0 */
389 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
390 if (retval != ERROR_OK)
391 return retval;
392
393 /* write R0 to DCC */
394 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, WRITE_REG_DTRTX), &dpm->dscr);
395 if (retval != ERROR_OK)
396 return retval;
397
398 return dpmv8_read_dcc(armv8, data, &dpm->dscr);
399 }
400
401 static int dpmv8_instr_read_data_r0_64(struct arm_dpm *dpm,
402 uint32_t opcode, uint64_t *data)
403 {
404 struct armv8_common *armv8 = dpm->arm->arch_info;
405 int retval;
406
407 if (dpm->arm->core_state != ARM_STATE_AARCH64) {
408 uint32_t tmp;
409 retval = dpmv8_instr_read_data_r0(dpm, opcode, &tmp);
410 if (retval == ERROR_OK)
411 *data = tmp;
412 return retval;
413 }
414
415 /* the opcode, writing data to R0 */
416 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
417 if (retval != ERROR_OK)
418 return retval;
419
420 /* write R0 to DCC */
421 retval = dpmv8_exec_opcode(dpm, ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0), &dpm->dscr);
422 if (retval != ERROR_OK)
423 return retval;
424
425 return dpmv8_read_dcc_64(armv8, data, &dpm->dscr);
426 }
427
428 #if 0
429 static int dpmv8_bpwp_enable(struct arm_dpm *dpm, unsigned index_t,
430 target_addr_t addr, uint32_t control)
431 {
432 struct armv8_common *armv8 = dpm->arm->arch_info;
433 uint32_t vr = armv8->debug_base;
434 uint32_t cr = armv8->debug_base;
435 int retval;
436
437 switch (index_t) {
438 case 0 ... 15: /* breakpoints */
439 vr += CPUV8_DBG_BVR_BASE;
440 cr += CPUV8_DBG_BCR_BASE;
441 break;
442 case 16 ... 31: /* watchpoints */
443 vr += CPUV8_DBG_WVR_BASE;
444 cr += CPUV8_DBG_WCR_BASE;
445 index_t -= 16;
446 break;
447 default:
448 return ERROR_FAIL;
449 }
450 vr += 16 * index_t;
451 cr += 16 * index_t;
452
453 LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x",
454 (unsigned) vr, (unsigned) cr);
455
456 retval = mem_ap_write_atomic_u32(armv8->debug_ap, vr, addr);
457 if (retval != ERROR_OK)
458 return retval;
459 return mem_ap_write_atomic_u32(armv8->debug_ap, cr, control);
460 }
461 #endif
462
463 static int dpmv8_bpwp_disable(struct arm_dpm *dpm, unsigned index_t)
464 {
465 struct armv8_common *armv8 = dpm->arm->arch_info;
466 uint32_t cr;
467
468 switch (index_t) {
469 case 0 ... 15:
470 cr = armv8->debug_base + CPUV8_DBG_BCR_BASE;
471 break;
472 case 16 ... 31:
473 cr = armv8->debug_base + CPUV8_DBG_WCR_BASE;
474 index_t -= 16;
475 break;
476 default:
477 return ERROR_FAIL;
478 }
479 cr += 16 * index_t;
480
481 LOG_DEBUG("A: bpwp disable, cr %08x", (unsigned) cr);
482
483 /* clear control register */
484 return mem_ap_write_atomic_u32(armv8->debug_ap, cr, 0);
485 }
486
487 /*
488 * Coprocessor support
489 */
490
491 /* Read coprocessor */
492 static int dpmv8_mrc(struct target *target, int cpnum,
493 uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
494 uint32_t *value)
495 {
496 struct arm *arm = target_to_arm(target);
497 struct arm_dpm *dpm = arm->dpm;
498 int retval;
499
500 retval = dpm->prepare(dpm);
501 if (retval != ERROR_OK)
502 return retval;
503
504 LOG_DEBUG("MRC p%d, %d, r0, c%d, c%d, %d", cpnum,
505 (int) op1, (int) CRn,
506 (int) CRm, (int) op2);
507
508 /* read coprocessor register into R0; return via DCC */
509 retval = dpm->instr_read_data_r0(dpm,
510 ARMV4_5_MRC(cpnum, op1, 0, CRn, CRm, op2),
511 value);
512
513 /* (void) */ dpm->finish(dpm);
514 return retval;
515 }
516
517 static int dpmv8_mcr(struct target *target, int cpnum,
518 uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
519 uint32_t value)
520 {
521 struct arm *arm = target_to_arm(target);
522 struct arm_dpm *dpm = arm->dpm;
523 int retval;
524
525 retval = dpm->prepare(dpm);
526 if (retval != ERROR_OK)
527 return retval;
528
529 LOG_DEBUG("MCR p%d, %d, r0, c%d, c%d, %d", cpnum,
530 (int) op1, (int) CRn,
531 (int) CRm, (int) op2);
532
533 /* read DCC into r0; then write coprocessor register from R0 */
534 retval = dpm->instr_write_data_r0(dpm,
535 ARMV4_5_MCR(cpnum, op1, 0, CRn, CRm, op2),
536 value);
537
538 /* (void) */ dpm->finish(dpm);
539 return retval;
540 }
541
542 /*----------------------------------------------------------------------*/
543
544 /*
545 * Register access utilities
546 */
547
548 int armv8_dpm_modeswitch(struct arm_dpm *dpm, enum arm_mode mode)
549 {
550 struct armv8_common *armv8 = (struct armv8_common *)dpm->arm->arch_info;
551 int retval = ERROR_OK;
552 unsigned int target_el;
553 enum arm_state core_state;
554 uint32_t cpsr;
555
556 /* restore previous mode */
557 if (mode == ARM_MODE_ANY) {
558 cpsr = buf_get_u32(dpm->arm->cpsr->value, 0, 32);
559
560 LOG_DEBUG("restoring mode, cpsr = 0x%08"PRIx32, cpsr);
561
562 } else {
563 LOG_DEBUG("setting mode 0x%"PRIx32, mode);
564 cpsr = mode;
565 }
566
567 switch (cpsr & 0x1f) {
568 /* aarch32 modes */
569 case ARM_MODE_USR:
570 target_el = 0;
571 break;
572 case ARM_MODE_SVC:
573 case ARM_MODE_ABT:
574 case ARM_MODE_IRQ:
575 case ARM_MODE_FIQ:
576 target_el = 1;
577 break;
578 /*
579 * TODO: handle ARM_MODE_HYP
580 * case ARM_MODE_HYP:
581 * target_el = 2;
582 * break;
583 */
584 case ARM_MODE_MON:
585 target_el = 3;
586 break;
587 /* aarch64 modes */
588 default:
589 target_el = (cpsr >> 2) & 3;
590 }
591
592 if (target_el > SYSTEM_CUREL_EL3) {
593 LOG_ERROR("%s: Invalid target exception level %i", __func__, target_el);
594 return ERROR_FAIL;
595 }
596
597 LOG_DEBUG("target_el = %i, last_el = %i", target_el, dpm->last_el);
598 if (target_el > dpm->last_el) {
599 retval = dpm->instr_execute(dpm,
600 armv8_opcode(armv8, ARMV8_OPC_DCPS) | target_el);
601
602 /* DCPS clobbers registers just like an exception taken */
603 armv8_dpm_handle_exception(dpm, false);
604 } else {
605 core_state = armv8_dpm_get_core_state(dpm);
606 if (core_state != ARM_STATE_AARCH64) {
607 /* cannot do DRPS/ERET when already in EL0 */
608 if (dpm->last_el != 0) {
609 /* load SPSR with the desired mode and execute DRPS */
610 LOG_DEBUG("SPSR = 0x%08"PRIx32, cpsr);
611 retval = dpm->instr_write_data_r0(dpm,
612 ARMV8_MSR_GP_xPSR_T1(1, 0, 15), cpsr);
613 if (retval == ERROR_OK)
614 retval = dpm->instr_execute(dpm, armv8_opcode(armv8, ARMV8_OPC_DRPS));
615 }
616 } else {
617 /*
618 * need to execute multiple DRPS instructions until target_el
619 * is reached
620 */
621 while (retval == ERROR_OK && dpm->last_el != target_el) {
622 unsigned int cur_el = dpm->last_el;
623 retval = dpm->instr_execute(dpm, armv8_opcode(armv8, ARMV8_OPC_DRPS));
624 if (cur_el == dpm->last_el) {
625 LOG_INFO("Cannot reach EL %i, SPSR corrupted?", target_el);
626 break;
627 }
628 }
629 }
630
631 /* On executing DRPS, DSPSR and DLR become UNKNOWN, mark them as dirty */
632 dpm->arm->cpsr->dirty = true;
633 dpm->arm->pc->dirty = true;
634
635 /*
636 * re-evaluate the core state, we might be in Aarch32 state now
637 * we rely on dpm->dscr being up-to-date
638 */
639 core_state = armv8_dpm_get_core_state(dpm);
640 armv8_select_opcodes(armv8, core_state == ARM_STATE_AARCH64);
641 armv8_select_reg_access(armv8, core_state == ARM_STATE_AARCH64);
642 }
643
644 return retval;
645 }
646
647 /*
648 * Common register read, relies on armv8_select_reg_access() having been called.
649 */
650 static int dpmv8_read_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
651 {
652 struct armv8_common *armv8 = dpm->arm->arch_info;
653 int retval = ERROR_FAIL;
654
655 if (r->size <= 64) {
656 uint64_t value_64;
657 retval = armv8->read_reg_u64(armv8, regnum, &value_64);
658
659 if (retval == ERROR_OK) {
660 r->valid = true;
661 r->dirty = false;
662 buf_set_u64(r->value, 0, r->size, value_64);
663 if (r->size == 64)
664 LOG_DEBUG("READ: %s, %16.8llx", r->name, (unsigned long long) value_64);
665 else
666 LOG_DEBUG("READ: %s, %8.8x", r->name, (unsigned int) value_64);
667 }
668 } else if (r->size <= 128) {
669 uint64_t lvalue = 0, hvalue = 0;
670 retval = armv8->read_reg_u128(armv8, regnum, &lvalue, &hvalue);
671
672 if (retval == ERROR_OK) {
673 r->valid = true;
674 r->dirty = false;
675
676 buf_set_u64(r->value, 0, 64, lvalue);
677 buf_set_u64(r->value + 8, 0, r->size - 64, hvalue);
678
679 LOG_DEBUG("READ: %s, lvalue=%16.8llx", r->name, (unsigned long long) lvalue);
680 LOG_DEBUG("READ: %s, hvalue=%16.8llx", r->name, (unsigned long long) hvalue);
681 }
682 }
683 return retval;
684 }
685
686 /*
687 * Common register write, relies on armv8_select_reg_access() having been called.
688 */
689 static int dpmv8_write_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
690 {
691 struct armv8_common *armv8 = dpm->arm->arch_info;
692 int retval = ERROR_FAIL;
693
694 if (r->size <= 64) {
695 uint64_t value_64;
696
697 value_64 = buf_get_u64(r->value, 0, r->size);
698 retval = armv8->write_reg_u64(armv8, regnum, value_64);
699
700 if (retval == ERROR_OK) {
701 r->dirty = false;
702 if (r->size == 64)
703 LOG_DEBUG("WRITE: %s, %16.8llx", r->name, (unsigned long long)value_64);
704 else
705 LOG_DEBUG("WRITE: %s, %8.8x", r->name, (unsigned int)value_64);
706 }
707 } else if (r->size <= 128) {
708 uint64_t lvalue, hvalue;
709
710 lvalue = buf_get_u64(r->value, 0, 64);
711 hvalue = buf_get_u64(r->value + 8, 0, r->size - 64);
712 retval = armv8->write_reg_u128(armv8, regnum, lvalue, hvalue);
713
714 if (retval == ERROR_OK) {
715 r->dirty = false;
716
717 LOG_DEBUG("WRITE: %s, lvalue=%16.8llx", r->name, (unsigned long long) lvalue);
718 LOG_DEBUG("WRITE: %s, hvalue=%16.8llx", r->name, (unsigned long long) hvalue);
719 }
720 }
721
722 return retval;
723 }
724
725 /**
726 * Read basic registers of the the current context: R0 to R15, and CPSR;
727 * sets the core mode (such as USR or IRQ) and state (such as ARM or Thumb).
728 * In normal operation this is called on entry to halting debug state,
729 * possibly after some other operations supporting restore of debug state
730 * or making sure the CPU is fully idle (drain write buffer, etc).
731 */
732 int armv8_dpm_read_current_registers(struct arm_dpm *dpm)
733 {
734 struct arm *arm = dpm->arm;
735 struct armv8_common *armv8 = (struct armv8_common *)arm->arch_info;
736 struct reg_cache *cache;
737 struct reg *r;
738 uint32_t cpsr;
739 int retval;
740
741 retval = dpm->prepare(dpm);
742 if (retval != ERROR_OK)
743 return retval;
744
745 cache = arm->core_cache;
746
747 /* read R0 first (it's used for scratch), then CPSR */
748 r = cache->reg_list + ARMV8_R0;
749 if (!r->valid) {
750 retval = dpmv8_read_reg(dpm, r, ARMV8_R0);
751 if (retval != ERROR_OK)
752 goto fail;
753 }
754 r->dirty = true;
755
756 /* read R1, too, it will be clobbered during memory access */
757 r = cache->reg_list + ARMV8_R1;
758 if (!r->valid) {
759 retval = dpmv8_read_reg(dpm, r, ARMV8_R1);
760 if (retval != ERROR_OK)
761 goto fail;
762 }
763
764 /* read cpsr to r0 and get it back */
765 retval = dpm->instr_read_data_r0(dpm,
766 armv8_opcode(armv8, READ_REG_DSPSR), &cpsr);
767 if (retval != ERROR_OK)
768 goto fail;
769
770 /* update core mode and state */
771 armv8_set_cpsr(arm, cpsr);
772
773 for (unsigned int i = ARMV8_PC; i < cache->num_regs ; i++) {
774 struct arm_reg *arm_reg;
775
776 r = armv8_reg_current(arm, i);
777 if (r->valid)
778 continue;
779
780 /* Skip reading FP-SIMD registers */
781 if (r->number >= ARMV8_V0 && r->number <= ARMV8_FPCR)
782 continue;
783
784 /*
785 * Only read registers that are available from the
786 * current EL (or core mode).
787 */
788 arm_reg = r->arch_info;
789 if (arm_reg->mode != ARM_MODE_ANY &&
790 dpm->last_el != armv8_curel_from_core_mode(arm_reg->mode))
791 continue;
792
793 retval = dpmv8_read_reg(dpm, r, i);
794 if (retval != ERROR_OK)
795 goto fail;
796
797 }
798
799 fail:
800 dpm->finish(dpm);
801 return retval;
802 }
803
804 /* Avoid needless I/O ... leave breakpoints and watchpoints alone
805 * unless they're removed, or need updating because of single-stepping
806 * or running debugger code.
807 */
808 static int dpmv8_maybe_update_bpwp(struct arm_dpm *dpm, bool bpwp,
809 struct dpm_bpwp *xp, int *set_p)
810 {
811 int retval = ERROR_OK;
812 bool disable;
813
814 if (!set_p) {
815 if (!xp->dirty)
816 goto done;
817 xp->dirty = false;
818 /* removed or startup; we must disable it */
819 disable = true;
820 } else if (bpwp) {
821 if (!xp->dirty)
822 goto done;
823 /* disabled, but we must set it */
824 xp->dirty = disable = false;
825 *set_p = true;
826 } else {
827 if (!*set_p)
828 goto done;
829 /* set, but we must temporarily disable it */
830 xp->dirty = disable = true;
831 *set_p = false;
832 }
833
834 if (disable)
835 retval = dpm->bpwp_disable(dpm, xp->number);
836 else
837 retval = dpm->bpwp_enable(dpm, xp->number,
838 xp->address, xp->control);
839
840 if (retval != ERROR_OK)
841 LOG_ERROR("%s: can't %s HW %spoint %d",
842 disable ? "disable" : "enable",
843 target_name(dpm->arm->target),
844 (xp->number < 16) ? "break" : "watch",
845 xp->number & 0xf);
846 done:
847 return retval;
848 }
849
850 static int dpmv8_add_breakpoint(struct target *target, struct breakpoint *bp);
851
852 /**
853 * Writes all modified core registers for all processor modes. In normal
854 * operation this is called on exit from halting debug state.
855 *
856 * @param dpm: represents the processor
857 * @param bpwp: true ensures breakpoints and watchpoints are set,
858 * false ensures they are cleared
859 */
860 int armv8_dpm_write_dirty_registers(struct arm_dpm *dpm, bool bpwp)
861 {
862 struct arm *arm = dpm->arm;
863 struct reg_cache *cache = arm->core_cache;
864 int retval;
865
866 retval = dpm->prepare(dpm);
867 if (retval != ERROR_OK)
868 goto done;
869
870 /* If we're managing hardware breakpoints for this core, enable
871 * or disable them as requested.
872 *
873 * REVISIT We don't yet manage them for ANY cores. Eventually
874 * we should be able to assume we handle them; but until then,
875 * cope with the hand-crafted breakpoint code.
876 */
877 if (arm->target->type->add_breakpoint == dpmv8_add_breakpoint) {
878 for (unsigned i = 0; i < dpm->nbp; i++) {
879 struct dpm_bp *dbp = dpm->dbp + i;
880 struct breakpoint *bp = dbp->bp;
881
882 retval = dpmv8_maybe_update_bpwp(dpm, bpwp, &dbp->bpwp,
883 bp ? &bp->set : NULL);
884 if (retval != ERROR_OK)
885 goto done;
886 }
887 }
888
889 /* enable/disable watchpoints */
890 for (unsigned i = 0; i < dpm->nwp; i++) {
891 struct dpm_wp *dwp = dpm->dwp + i;
892 struct watchpoint *wp = dwp->wp;
893
894 retval = dpmv8_maybe_update_bpwp(dpm, bpwp, &dwp->bpwp,
895 wp ? &wp->set : NULL);
896 if (retval != ERROR_OK)
897 goto done;
898 }
899
900 /* NOTE: writes to breakpoint and watchpoint registers might
901 * be queued, and need (efficient/batched) flushing later.
902 */
903
904 /* Restore original core mode and state */
905 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
906 if (retval != ERROR_OK)
907 goto done;
908
909 /* check everything except our scratch register R0 */
910 for (unsigned i = 1; i < cache->num_regs; i++) {
911 struct arm_reg *r;
912
913 /* skip PC and CPSR */
914 if (i == ARMV8_PC || i == ARMV8_xPSR)
915 continue;
916 /* skip invalid */
917 if (!cache->reg_list[i].valid)
918 continue;
919 /* skip non-dirty */
920 if (!cache->reg_list[i].dirty)
921 continue;
922
923 /* skip all registers not on the current EL */
924 r = cache->reg_list[i].arch_info;
925 if (r->mode != ARM_MODE_ANY &&
926 dpm->last_el != armv8_curel_from_core_mode(r->mode))
927 continue;
928
929 retval = dpmv8_write_reg(dpm, &cache->reg_list[i], i);
930 if (retval != ERROR_OK)
931 break;
932 }
933
934 /* flush CPSR and PC */
935 if (retval == ERROR_OK)
936 retval = dpmv8_write_reg(dpm, &cache->reg_list[ARMV8_xPSR], ARMV8_xPSR);
937 if (retval == ERROR_OK)
938 retval = dpmv8_write_reg(dpm, &cache->reg_list[ARMV8_PC], ARMV8_PC);
939 /* flush R0 -- it's *very* dirty by now */
940 if (retval == ERROR_OK)
941 retval = dpmv8_write_reg(dpm, &cache->reg_list[0], 0);
942 if (retval == ERROR_OK)
943 dpm->instr_cpsr_sync(dpm);
944 done:
945 dpm->finish(dpm);
946 return retval;
947 }
948
949 /*
950 * Standard ARM register accessors ... there are three methods
951 * in "struct arm", to support individual read/write and bulk read
952 * of registers.
953 */
954
955 static int armv8_dpm_read_core_reg(struct target *target, struct reg *r,
956 int regnum, enum arm_mode mode)
957 {
958 struct arm *arm = target_to_arm(target);
959 struct arm_dpm *dpm = target_to_arm(target)->dpm;
960 int retval;
961 int max = arm->core_cache->num_regs;
962
963 if (regnum < 0 || regnum >= max)
964 return ERROR_COMMAND_SYNTAX_ERROR;
965
966 /*
967 * REVISIT what happens if we try to read SPSR in a core mode
968 * which has no such register?
969 */
970 retval = dpm->prepare(dpm);
971 if (retval != ERROR_OK)
972 return retval;
973
974 retval = dpmv8_read_reg(dpm, r, regnum);
975 if (retval != ERROR_OK)
976 goto fail;
977
978 fail:
979 /* (void) */ dpm->finish(dpm);
980 return retval;
981 }
982
983 static int armv8_dpm_write_core_reg(struct target *target, struct reg *r,
984 int regnum, enum arm_mode mode, uint8_t *value)
985 {
986 struct arm *arm = target_to_arm(target);
987 struct arm_dpm *dpm = target_to_arm(target)->dpm;
988 int retval;
989 int max = arm->core_cache->num_regs;
990
991 if (regnum < 0 || regnum > max)
992 return ERROR_COMMAND_SYNTAX_ERROR;
993
994 /* REVISIT what happens if we try to write SPSR in a core mode
995 * which has no such register?
996 */
997
998 retval = dpm->prepare(dpm);
999 if (retval != ERROR_OK)
1000 return retval;
1001
1002 retval = dpmv8_write_reg(dpm, r, regnum);
1003
1004 /* always clean up, regardless of error */
1005 dpm->finish(dpm);
1006
1007 return retval;
1008 }
1009
1010 static int armv8_dpm_full_context(struct target *target)
1011 {
1012 struct arm *arm = target_to_arm(target);
1013 struct arm_dpm *dpm = arm->dpm;
1014 struct reg_cache *cache = arm->core_cache;
1015 int retval;
1016 bool did_read;
1017
1018 retval = dpm->prepare(dpm);
1019 if (retval != ERROR_OK)
1020 goto done;
1021
1022 do {
1023 enum arm_mode mode = ARM_MODE_ANY;
1024
1025 did_read = false;
1026
1027 /* We "know" arm_dpm_read_current_registers() was called so
1028 * the unmapped registers (R0..R7, PC, AND CPSR) and some
1029 * view of R8..R14 are current. We also "know" oddities of
1030 * register mapping: special cases for R8..R12 and SPSR.
1031 *
1032 * Pick some mode with unread registers and read them all.
1033 * Repeat until done.
1034 */
1035 for (unsigned i = 0; i < cache->num_regs; i++) {
1036 struct arm_reg *r;
1037
1038 if (cache->reg_list[i].valid)
1039 continue;
1040 r = cache->reg_list[i].arch_info;
1041
1042 /* may need to pick a mode and set CPSR */
1043 if (!did_read) {
1044 did_read = true;
1045 mode = r->mode;
1046
1047 /* For regular (ARM_MODE_ANY) R8..R12
1048 * in case we've entered debug state
1049 * in FIQ mode we need to patch mode.
1050 */
1051 if (mode != ARM_MODE_ANY)
1052 retval = armv8_dpm_modeswitch(dpm, mode);
1053 else
1054 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_USR);
1055
1056 if (retval != ERROR_OK)
1057 goto done;
1058 }
1059 if (r->mode != mode)
1060 continue;
1061
1062 /* CPSR was read, so "R16" must mean SPSR */
1063 retval = dpmv8_read_reg(dpm,
1064 &cache->reg_list[i],
1065 (r->num == 16) ? 17 : r->num);
1066 if (retval != ERROR_OK)
1067 goto done;
1068 }
1069
1070 } while (did_read);
1071
1072 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
1073 /* (void) */ dpm->finish(dpm);
1074 done:
1075 return retval;
1076 }
1077
1078
1079 /*----------------------------------------------------------------------*/
1080
1081 /*
1082 * Breakpoint and Watchpoint support.
1083 *
1084 * Hardware {break,watch}points are usually left active, to minimize
1085 * debug entry/exit costs. When they are set or cleared, it's done in
1086 * batches. Also, DPM-conformant hardware can update debug registers
1087 * regardless of whether the CPU is running or halted ... though that
1088 * fact isn't currently leveraged.
1089 */
1090
1091 static int dpmv8_bpwp_setup(struct arm_dpm *dpm, struct dpm_bpwp *xp,
1092 uint32_t addr, uint32_t length)
1093 {
1094 uint32_t control;
1095
1096 control = (1 << 0) /* enable */
1097 | (3 << 1); /* both user and privileged access */
1098
1099 /* Match 1, 2, or all 4 byte addresses in this word.
1100 *
1101 * FIXME: v7 hardware allows lengths up to 2 GB for BP and WP.
1102 * Support larger length, when addr is suitably aligned. In
1103 * particular, allow watchpoints on 8 byte "double" values.
1104 *
1105 * REVISIT allow watchpoints on unaligned 2-bit values; and on
1106 * v7 hardware, unaligned 4-byte ones too.
1107 */
1108 switch (length) {
1109 case 1:
1110 control |= (1 << (addr & 3)) << 5;
1111 break;
1112 case 2:
1113 /* require 2-byte alignment */
1114 if (!(addr & 1)) {
1115 control |= (3 << (addr & 2)) << 5;
1116 break;
1117 }
1118 /* FALL THROUGH */
1119 case 4:
1120 /* require 4-byte alignment */
1121 if (!(addr & 3)) {
1122 control |= 0xf << 5;
1123 break;
1124 }
1125 /* FALL THROUGH */
1126 default:
1127 LOG_ERROR("unsupported {break,watch}point length/alignment");
1128 return ERROR_COMMAND_SYNTAX_ERROR;
1129 }
1130
1131 /* other shared control bits:
1132 * bits 15:14 == 0 ... both secure and nonsecure states (v6.1+ only)
1133 * bit 20 == 0 ... not linked to a context ID
1134 * bit 28:24 == 0 ... not ignoring N LSBs (v7 only)
1135 */
1136
1137 xp->address = addr & ~3;
1138 xp->control = control;
1139 xp->dirty = true;
1140
1141 LOG_DEBUG("BPWP: addr %8.8" PRIx32 ", control %" PRIx32 ", number %d",
1142 xp->address, control, xp->number);
1143
1144 /* hardware is updated in write_dirty_registers() */
1145 return ERROR_OK;
1146 }
1147
1148 static int dpmv8_add_breakpoint(struct target *target, struct breakpoint *bp)
1149 {
1150 struct arm *arm = target_to_arm(target);
1151 struct arm_dpm *dpm = arm->dpm;
1152 int retval = ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1153
1154 if (bp->length < 2)
1155 return ERROR_COMMAND_SYNTAX_ERROR;
1156 if (!dpm->bpwp_enable)
1157 return retval;
1158
1159 /* FIXME we need a generic solution for software breakpoints. */
1160 if (bp->type == BKPT_SOFT)
1161 LOG_DEBUG("using HW bkpt, not SW...");
1162
1163 for (unsigned i = 0; i < dpm->nbp; i++) {
1164 if (!dpm->dbp[i].bp) {
1165 retval = dpmv8_bpwp_setup(dpm, &dpm->dbp[i].bpwp,
1166 bp->address, bp->length);
1167 if (retval == ERROR_OK)
1168 dpm->dbp[i].bp = bp;
1169 break;
1170 }
1171 }
1172
1173 return retval;
1174 }
1175
1176 static int dpmv8_remove_breakpoint(struct target *target, struct breakpoint *bp)
1177 {
1178 struct arm *arm = target_to_arm(target);
1179 struct arm_dpm *dpm = arm->dpm;
1180 int retval = ERROR_COMMAND_SYNTAX_ERROR;
1181
1182 for (unsigned i = 0; i < dpm->nbp; i++) {
1183 if (dpm->dbp[i].bp == bp) {
1184 dpm->dbp[i].bp = NULL;
1185 dpm->dbp[i].bpwp.dirty = true;
1186
1187 /* hardware is updated in write_dirty_registers() */
1188 retval = ERROR_OK;
1189 break;
1190 }
1191 }
1192
1193 return retval;
1194 }
1195
1196 static int dpmv8_watchpoint_setup(struct arm_dpm *dpm, unsigned index_t,
1197 struct watchpoint *wp)
1198 {
1199 int retval;
1200 struct dpm_wp *dwp = dpm->dwp + index_t;
1201 uint32_t control;
1202
1203 /* this hardware doesn't support data value matching or masking */
1204 if (wp->value || wp->mask != ~(uint32_t)0) {
1205 LOG_DEBUG("watchpoint values and masking not supported");
1206 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1207 }
1208
1209 retval = dpmv8_bpwp_setup(dpm, &dwp->bpwp, wp->address, wp->length);
1210 if (retval != ERROR_OK)
1211 return retval;
1212
1213 control = dwp->bpwp.control;
1214 switch (wp->rw) {
1215 case WPT_READ:
1216 control |= 1 << 3;
1217 break;
1218 case WPT_WRITE:
1219 control |= 2 << 3;
1220 break;
1221 case WPT_ACCESS:
1222 control |= 3 << 3;
1223 break;
1224 }
1225 dwp->bpwp.control = control;
1226
1227 dpm->dwp[index_t].wp = wp;
1228
1229 return retval;
1230 }
1231
1232 static int dpmv8_add_watchpoint(struct target *target, struct watchpoint *wp)
1233 {
1234 struct arm *arm = target_to_arm(target);
1235 struct arm_dpm *dpm = arm->dpm;
1236 int retval = ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1237
1238 if (dpm->bpwp_enable) {
1239 for (unsigned i = 0; i < dpm->nwp; i++) {
1240 if (!dpm->dwp[i].wp) {
1241 retval = dpmv8_watchpoint_setup(dpm, i, wp);
1242 break;
1243 }
1244 }
1245 }
1246
1247 return retval;
1248 }
1249
1250 static int dpmv8_remove_watchpoint(struct target *target, struct watchpoint *wp)
1251 {
1252 struct arm *arm = target_to_arm(target);
1253 struct arm_dpm *dpm = arm->dpm;
1254 int retval = ERROR_COMMAND_SYNTAX_ERROR;
1255
1256 for (unsigned i = 0; i < dpm->nwp; i++) {
1257 if (dpm->dwp[i].wp == wp) {
1258 dpm->dwp[i].wp = NULL;
1259 dpm->dwp[i].bpwp.dirty = true;
1260
1261 /* hardware is updated in write_dirty_registers() */
1262 retval = ERROR_OK;
1263 break;
1264 }
1265 }
1266
1267 return retval;
1268 }
1269
1270 void armv8_dpm_report_wfar(struct arm_dpm *dpm, uint64_t addr)
1271 {
1272 switch (dpm->arm->core_state) {
1273 case ARM_STATE_ARM:
1274 case ARM_STATE_AARCH64:
1275 addr -= 8;
1276 break;
1277 case ARM_STATE_THUMB:
1278 case ARM_STATE_THUMB_EE:
1279 addr -= 4;
1280 break;
1281 case ARM_STATE_JAZELLE:
1282 /* ?? */
1283 break;
1284 default:
1285 LOG_DEBUG("Unknown core_state");
1286 break;
1287 }
1288 dpm->wp_pc = addr;
1289 }
1290
1291 /*
1292 * Handle exceptions taken in debug state. This happens mostly for memory
1293 * accesses that violated a MMU policy. Taking an exception while in debug
1294 * state clobbers certain state registers on the target exception level.
1295 * Just mark those registers dirty so that they get restored on resume.
1296 * This works both for Aarch32 and Aarch64 states.
1297 *
1298 * This function must not perform any actions that trigger another exception
1299 * or a recursion will happen.
1300 */
1301 void armv8_dpm_handle_exception(struct arm_dpm *dpm, bool do_restore)
1302 {
1303 struct armv8_common *armv8 = dpm->arm->arch_info;
1304 struct reg_cache *cache = dpm->arm->core_cache;
1305 enum arm_state core_state;
1306 uint64_t dlr;
1307 uint32_t dspsr;
1308 unsigned int el;
1309
1310 static const int clobbered_regs_by_el[3][5] = {
1311 { ARMV8_PC, ARMV8_xPSR, ARMV8_ELR_EL1, ARMV8_ESR_EL1, ARMV8_SPSR_EL1 },
1312 { ARMV8_PC, ARMV8_xPSR, ARMV8_ELR_EL2, ARMV8_ESR_EL2, ARMV8_SPSR_EL2 },
1313 { ARMV8_PC, ARMV8_xPSR, ARMV8_ELR_EL3, ARMV8_ESR_EL3, ARMV8_SPSR_EL3 },
1314 };
1315
1316 el = (dpm->dscr >> 8) & 3;
1317
1318 /* safety check, must not happen since EL0 cannot be a target for an exception */
1319 if (el < SYSTEM_CUREL_EL1 || el > SYSTEM_CUREL_EL3) {
1320 LOG_ERROR("%s: EL %i is invalid, DSCR corrupted?", __func__, el);
1321 return;
1322 }
1323
1324 /* Clear sticky error */
1325 mem_ap_write_u32(armv8->debug_ap,
1326 armv8->debug_base + CPUV8_DBG_DRCR, DRCR_CSE);
1327
1328 armv8->read_reg_u64(armv8, ARMV8_xPSR, &dlr);
1329 dspsr = dlr;
1330 armv8->read_reg_u64(armv8, ARMV8_PC, &dlr);
1331
1332 LOG_DEBUG("Exception taken to EL %i, DLR=0x%016"PRIx64" DSPSR=0x%08"PRIx32,
1333 el, dlr, dspsr);
1334
1335 /* mark all clobbered registers as dirty */
1336 for (int i = 0; i < 5; i++)
1337 cache->reg_list[clobbered_regs_by_el[el-1][i]].dirty = true;
1338
1339 /*
1340 * re-evaluate the core state, we might be in Aarch64 state now
1341 * we rely on dpm->dscr being up-to-date
1342 */
1343 core_state = armv8_dpm_get_core_state(dpm);
1344 armv8_select_opcodes(armv8, core_state == ARM_STATE_AARCH64);
1345 armv8_select_reg_access(armv8, core_state == ARM_STATE_AARCH64);
1346
1347 if (do_restore)
1348 armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
1349 }
1350
1351 /*----------------------------------------------------------------------*/
1352
1353 /*
1354 * Other debug and support utilities
1355 */
1356
1357 void armv8_dpm_report_dscr(struct arm_dpm *dpm, uint32_t dscr)
1358 {
1359 struct target *target = dpm->arm->target;
1360
1361 dpm->dscr = dscr;
1362 dpm->last_el = (dscr >> 8) & 3;
1363
1364 /* Examine debug reason */
1365 switch (DSCR_ENTRY(dscr)) {
1366 /* FALL THROUGH -- assume a v6 core in abort mode */
1367 case DSCRV8_ENTRY_EXT_DEBUG: /* EDBGRQ */
1368 target->debug_reason = DBG_REASON_DBGRQ;
1369 break;
1370 case DSCRV8_ENTRY_HALT_STEP_EXECLU: /* HALT step */
1371 case DSCRV8_ENTRY_HALT_STEP_NORMAL: /* Halt step*/
1372 case DSCRV8_ENTRY_HALT_STEP:
1373 target->debug_reason = DBG_REASON_SINGLESTEP;
1374 break;
1375 case DSCRV8_ENTRY_HLT: /* HLT instruction (software breakpoint) */
1376 case DSCRV8_ENTRY_BKPT: /* SW BKPT (?) */
1377 case DSCRV8_ENTRY_RESET_CATCH: /* Reset catch */
1378 case DSCRV8_ENTRY_OS_UNLOCK: /*OS unlock catch*/
1379 case DSCRV8_ENTRY_EXCEPTION_CATCH: /*exception catch*/
1380 case DSCRV8_ENTRY_SW_ACCESS_DBG: /*SW access dbg register*/
1381 target->debug_reason = DBG_REASON_BREAKPOINT;
1382 break;
1383 case DSCRV8_ENTRY_WATCHPOINT: /* asynch watchpoint */
1384 target->debug_reason = DBG_REASON_WATCHPOINT;
1385 break;
1386 default:
1387 target->debug_reason = DBG_REASON_UNDEFINED;
1388 break;
1389 }
1390
1391 }
1392
1393 /*----------------------------------------------------------------------*/
1394
1395 /*
1396 * Setup and management support.
1397 */
1398
1399 /**
1400 * Hooks up this DPM to its associated target; call only once.
1401 * Initially this only covers the register cache.
1402 *
1403 * Oh, and watchpoints. Yeah.
1404 */
1405 int armv8_dpm_setup(struct arm_dpm *dpm)
1406 {
1407 struct arm *arm = dpm->arm;
1408 struct target *target = arm->target;
1409 struct reg_cache *cache;
1410 arm->dpm = dpm;
1411
1412 /* register access setup */
1413 arm->full_context = armv8_dpm_full_context;
1414 arm->read_core_reg = armv8_dpm_read_core_reg;
1415 arm->write_core_reg = armv8_dpm_write_core_reg;
1416
1417 if (arm->core_cache == NULL) {
1418 cache = armv8_build_reg_cache(target);
1419 if (!cache)
1420 return ERROR_FAIL;
1421 }
1422
1423 /* coprocessor access setup */
1424 arm->mrc = dpmv8_mrc;
1425 arm->mcr = dpmv8_mcr;
1426
1427 dpm->prepare = dpmv8_dpm_prepare;
1428 dpm->finish = dpmv8_dpm_finish;
1429
1430 dpm->instr_execute = dpmv8_instr_execute;
1431 dpm->instr_write_data_dcc = dpmv8_instr_write_data_dcc;
1432 dpm->instr_write_data_dcc_64 = dpmv8_instr_write_data_dcc_64;
1433 dpm->instr_write_data_r0 = dpmv8_instr_write_data_r0;
1434 dpm->instr_write_data_r0_64 = dpmv8_instr_write_data_r0_64;
1435 dpm->instr_cpsr_sync = dpmv8_instr_cpsr_sync;
1436
1437 dpm->instr_read_data_dcc = dpmv8_instr_read_data_dcc;
1438 dpm->instr_read_data_dcc_64 = dpmv8_instr_read_data_dcc_64;
1439 dpm->instr_read_data_r0 = dpmv8_instr_read_data_r0;
1440 dpm->instr_read_data_r0_64 = dpmv8_instr_read_data_r0_64;
1441
1442 dpm->arm_reg_current = armv8_reg_current;
1443
1444 /* dpm->bpwp_enable = dpmv8_bpwp_enable; */
1445 dpm->bpwp_disable = dpmv8_bpwp_disable;
1446
1447 /* breakpoint setup -- optional until it works everywhere */
1448 if (!target->type->add_breakpoint) {
1449 target->type->add_breakpoint = dpmv8_add_breakpoint;
1450 target->type->remove_breakpoint = dpmv8_remove_breakpoint;
1451 }
1452
1453 /* watchpoint setup */
1454 target->type->add_watchpoint = dpmv8_add_watchpoint;
1455 target->type->remove_watchpoint = dpmv8_remove_watchpoint;
1456
1457 /* FIXME add vector catch support */
1458
1459 dpm->nbp = 1 + ((dpm->didr >> 12) & 0xf);
1460 dpm->dbp = calloc(dpm->nbp, sizeof *dpm->dbp);
1461
1462 dpm->nwp = 1 + ((dpm->didr >> 20) & 0xf);
1463 dpm->dwp = calloc(dpm->nwp, sizeof *dpm->dwp);
1464
1465 if (!dpm->dbp || !dpm->dwp) {
1466 free(dpm->dbp);
1467 free(dpm->dwp);
1468 return ERROR_FAIL;
1469 }
1470
1471 LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
1472 target_name(target), dpm->nbp, dpm->nwp);
1473
1474 /* REVISIT ... and some of those breakpoints could match
1475 * execution context IDs...
1476 */
1477
1478 return ERROR_OK;
1479 }
1480
1481 /**
1482 * Reinitializes DPM state at the beginning of a new debug session
1483 * or after a reset which may have affected the debug module.
1484 */
1485 int armv8_dpm_initialize(struct arm_dpm *dpm)
1486 {
1487 /* Disable all breakpoints and watchpoints at startup. */
1488 if (dpm->bpwp_disable) {
1489 unsigned i;
1490
1491 for (i = 0; i < dpm->nbp; i++) {
1492 dpm->dbp[i].bpwp.number = i;
1493 (void) dpm->bpwp_disable(dpm, i);
1494 }
1495 for (i = 0; i < dpm->nwp; i++) {
1496 dpm->dwp[i].bpwp.number = 16 + i;
1497 (void) dpm->bpwp_disable(dpm, 16 + i);
1498 }
1499 } else
1500 LOG_WARNING("%s: can't disable breakpoints and watchpoints",
1501 target_name(dpm->arm->target));
1502
1503 return ERROR_OK;
1504 }
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