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rtos: hwthread: fix clang error core.NullDereference
[openocd.git] / src / target / armv8_dpm.c
blobf40beb847dfb895c9675d91714bbc7b9be1140a8
1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 /*
4 * Copyright (C) 2009 by David Brownell
5 */
6
7 #ifdef HAVE_CONFIG_H
8 #include "config.h"
9 #endif
10
11 #include "arm.h"
12 #include "armv8.h"
13 #include "armv8_dpm.h"
14 #include <jtag/jtag.h>
15 #include "register.h"
16 #include "breakpoints.h"
17 #include "target_type.h"
18 #include "armv8_opcodes.h"
19
20 #include "helper/time_support.h"
21
22 /* T32 ITR format */
23 #define T32_FMTITR(instr) (((instr & 0x0000FFFF) << 16) | ((instr & 0xFFFF0000) >> 16))
24
25 /**
26 * @file
27 * Implements various ARM DPM operations using architectural debug registers.
28 * These routines layer over core-specific communication methods to cope with
29 * implementation differences between cores like ARM1136 and Cortex-A8.
30 *
31 * The "Debug Programmers' Model" (DPM) for ARMv6 and ARMv7 is defined by
32 * Part C (Debug Architecture) of the ARM Architecture Reference Manual,
33 * ARMv7-A and ARMv7-R edition (ARM DDI 0406B). In OpenOCD, DPM operations
34 * are abstracted through internal programming interfaces to share code and
35 * to minimize needless differences in debug behavior between cores.
36 */
37
38 /**
39 * Get core state from EDSCR, without necessity to retrieve CPSR
40 */
41 enum arm_state armv8_dpm_get_core_state(struct arm_dpm *dpm)
42 {
43 int el = (dpm->dscr >> 8) & 0x3;
44 int rw = (dpm->dscr >> 10) & 0xF;
45
46 dpm->last_el = el;
47
48 /* In Debug state, each bit gives the current Execution state of each EL */
49 if ((rw >> el) & 0b1)
50 return ARM_STATE_AARCH64;
51
52 return ARM_STATE_ARM;
53 }
54
55 /*----------------------------------------------------------------------*/
56
57 static int dpmv8_write_dcc(struct armv8_common *armv8, uint32_t data)
58 {
59 return mem_ap_write_u32(armv8->debug_ap,
60 armv8->debug_base + CPUV8_DBG_DTRRX, data);
61 }
62
63 static int dpmv8_write_dcc_64(struct armv8_common *armv8, uint64_t data)
64 {
65 int ret;
66 ret = mem_ap_write_u32(armv8->debug_ap,
67 armv8->debug_base + CPUV8_DBG_DTRRX, data);
68 if (ret == ERROR_OK)
69 ret = mem_ap_write_u32(armv8->debug_ap,
70 armv8->debug_base + CPUV8_DBG_DTRTX, data >> 32);
71 return ret;
72 }
73
74 static int dpmv8_read_dcc(struct armv8_common *armv8, uint32_t *data,
75 uint32_t *dscr_p)
76 {
77 uint32_t dscr = DSCR_ITE;
78 int retval;
79
80 if (dscr_p)
81 dscr = *dscr_p;
82
83 /* Wait for DTRRXfull */
84 long long then = timeval_ms();
85 while ((dscr & DSCR_DTR_TX_FULL) == 0) {
86 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
87 armv8->debug_base + CPUV8_DBG_DSCR,
88 &dscr);
89 if (retval != ERROR_OK)
90 return retval;
91 if (timeval_ms() > then + 1000) {
92 LOG_ERROR("Timeout waiting for read dcc");
93 return ERROR_FAIL;
94 }
95 }
96
97 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
98 armv8->debug_base + CPUV8_DBG_DTRTX,
99 data);
100 if (retval != ERROR_OK)
101 return retval;
102
103 if (dscr_p)
104 *dscr_p = dscr;
105
106 return retval;
107 }
108
109 static int dpmv8_read_dcc_64(struct armv8_common *armv8, uint64_t *data,
110 uint32_t *dscr_p)
111 {
112 uint32_t dscr = DSCR_ITE;
113 uint32_t higher;
114 int retval;
115
116 if (dscr_p)
117 dscr = *dscr_p;
118
119 /* Wait for DTRRXfull */
120 long long then = timeval_ms();
121 while ((dscr & DSCR_DTR_TX_FULL) == 0) {
122 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
123 armv8->debug_base + CPUV8_DBG_DSCR,
124 &dscr);
125 if (retval != ERROR_OK)
126 return retval;
127 if (timeval_ms() > then + 1000) {
128 LOG_ERROR("Timeout waiting for DTR_TX_FULL, dscr = 0x%08" PRIx32, dscr);
129 return ERROR_FAIL;
130 }
131 }
132
133 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
134 armv8->debug_base + CPUV8_DBG_DTRTX,
135 (uint32_t *)data);
136 if (retval != ERROR_OK)
137 return retval;
138
139 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
140 armv8->debug_base + CPUV8_DBG_DTRRX,
141 &higher);
142 if (retval != ERROR_OK)
143 return retval;
144
145 *data = *(uint32_t *)data | (uint64_t)higher << 32;
146
147 if (dscr_p)
148 *dscr_p = dscr;
149
150 return retval;
151 }
152
153 static int dpmv8_dpm_prepare(struct arm_dpm *dpm)
154 {
155 struct armv8_common *armv8 = dpm->arm->arch_info;
156 uint32_t dscr;
157 int retval;
158
159 /* set up invariant: ITE is set after ever DPM operation */
160 long long then = timeval_ms();
161 for (;; ) {
162 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
163 armv8->debug_base + CPUV8_DBG_DSCR,
164 &dscr);
165 if (retval != ERROR_OK)
166 return retval;
167 if ((dscr & DSCR_ITE) != 0)
168 break;
169 if (timeval_ms() > then + 1000) {
170 LOG_ERROR("Timeout waiting for dpm prepare");
171 return ERROR_FAIL;
172 }
173 }
174
175 /* update the stored copy of dscr */
176 dpm->dscr = dscr;
177
178 /* this "should never happen" ... */
179 if (dscr & DSCR_DTR_RX_FULL) {
180 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
181 /* Clear DCCRX */
182 retval = mem_ap_read_u32(armv8->debug_ap,
183 armv8->debug_base + CPUV8_DBG_DTRRX, &dscr);
184 if (retval != ERROR_OK)
185 return retval;
186 }
187
188 return retval;
189 }
190
191 static int dpmv8_dpm_finish(struct arm_dpm *dpm)
192 {
193 /* REVISIT what could be done here? */
194 return ERROR_OK;
195 }
196
197 static int dpmv8_exec_opcode(struct arm_dpm *dpm,
198 uint32_t opcode, uint32_t *p_dscr)
199 {
200 struct armv8_common *armv8 = dpm->arm->arch_info;
201 uint32_t dscr = dpm->dscr;
202 int retval;
203
204 if (p_dscr)
205 dscr = *p_dscr;
206
207 /* Wait for InstrCompl bit to be set */
208 long long then = timeval_ms();
209 while ((dscr & DSCR_ITE) == 0) {
210 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
211 armv8->debug_base + CPUV8_DBG_DSCR, &dscr);
212 if (retval != ERROR_OK) {
213 LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode);
214 return retval;
215 }
216 if (timeval_ms() > then + 1000) {
217 LOG_ERROR("Timeout waiting for aarch64_exec_opcode");
218 return ERROR_FAIL;
219 }
220 }
221
222 if (armv8_dpm_get_core_state(dpm) != ARM_STATE_AARCH64)
223 opcode = T32_FMTITR(opcode);
224
225 retval = mem_ap_write_u32(armv8->debug_ap,
226 armv8->debug_base + CPUV8_DBG_ITR, opcode);
227 if (retval != ERROR_OK)
228 return retval;
229
230 then = timeval_ms();
231 do {
232 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
233 armv8->debug_base + CPUV8_DBG_DSCR, &dscr);
234 if (retval != ERROR_OK) {
235 LOG_ERROR("Could not read DSCR register");
236 return retval;
237 }
238 if (timeval_ms() > then + 1000) {
239 LOG_ERROR("Timeout waiting for aarch64_exec_opcode");
240 return ERROR_FAIL;
241 }
242 } while ((dscr & DSCR_ITE) == 0); /* Wait for InstrCompl bit to be set */
243
244 /* update dscr and el after each command execution */
245 dpm->dscr = dscr;
246 if (dpm->last_el != ((dscr >> 8) & 3))
247 LOG_DEBUG("EL %i -> %" PRIu32, dpm->last_el, (dscr >> 8) & 3);
248 dpm->last_el = (dscr >> 8) & 3;
249
250 if (dscr & DSCR_ERR) {
251 LOG_ERROR("Opcode 0x%08" PRIx32 ", DSCR.ERR=1, DSCR.EL=%i", opcode, dpm->last_el);
252 armv8_dpm_handle_exception(dpm, true);
253 retval = ERROR_FAIL;
254 }
255
256 if (p_dscr)
257 *p_dscr = dscr;
258
259 return retval;
260 }
261
262 static int dpmv8_instr_execute(struct arm_dpm *dpm, uint32_t opcode)
263 {
264 return dpmv8_exec_opcode(dpm, opcode, NULL);
265 }
266
267 static int dpmv8_instr_write_data_dcc(struct arm_dpm *dpm,
268 uint32_t opcode, uint32_t data)
269 {
270 struct armv8_common *armv8 = dpm->arm->arch_info;
271 int retval;
272
273 retval = dpmv8_write_dcc(armv8, data);
274 if (retval != ERROR_OK)
275 return retval;
276
277 return dpmv8_exec_opcode(dpm, opcode, 0);
278 }
279
280 static int dpmv8_instr_write_data_dcc_64(struct arm_dpm *dpm,
281 uint32_t opcode, uint64_t data)
282 {
283 struct armv8_common *armv8 = dpm->arm->arch_info;
284 int retval;
285
286 retval = dpmv8_write_dcc_64(armv8, data);
287 if (retval != ERROR_OK)
288 return retval;
289
290 return dpmv8_exec_opcode(dpm, opcode, 0);
291 }
292
293 static int dpmv8_instr_write_data_r0(struct arm_dpm *dpm,
294 uint32_t opcode, uint32_t data)
295 {
296 struct armv8_common *armv8 = dpm->arm->arch_info;
297 uint32_t dscr = DSCR_ITE;
298 int retval;
299
300 retval = dpmv8_write_dcc(armv8, data);
301 if (retval != ERROR_OK)
302 return retval;
303
304 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, READ_REG_DTRRX), &dscr);
305 if (retval != ERROR_OK)
306 return retval;
307
308 /* then the opcode, taking data from R0 */
309 return dpmv8_exec_opcode(dpm, opcode, &dscr);
310 }
311
312 static int dpmv8_instr_write_data_r0_64(struct arm_dpm *dpm,
313 uint32_t opcode, uint64_t data)
314 {
315 struct armv8_common *armv8 = dpm->arm->arch_info;
316 int retval;
317
318 if (dpm->arm->core_state != ARM_STATE_AARCH64)
319 return dpmv8_instr_write_data_r0(dpm, opcode, data);
320
321 /* transfer data from DCC to R0 */
322 retval = dpmv8_write_dcc_64(armv8, data);
323 if (retval == ERROR_OK)
324 retval = dpmv8_exec_opcode(dpm, ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dpm->dscr);
325
326 /* then the opcode, taking data from R0 */
327 if (retval == ERROR_OK)
328 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
329
330 return retval;
331 }
332
333 static int dpmv8_instr_cpsr_sync(struct arm_dpm *dpm)
334 {
335 int retval;
336 struct armv8_common *armv8 = dpm->arm->arch_info;
337
338 /* "Prefetch flush" after modifying execution status in CPSR */
339 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, ARMV8_OPC_DSB_SY), &dpm->dscr);
340 if (retval == ERROR_OK)
341 dpmv8_exec_opcode(dpm, armv8_opcode(armv8, ARMV8_OPC_ISB_SY), &dpm->dscr);
342 return retval;
343 }
344
345 static int dpmv8_instr_read_data_dcc(struct arm_dpm *dpm,
346 uint32_t opcode, uint32_t *data)
347 {
348 struct armv8_common *armv8 = dpm->arm->arch_info;
349 int retval;
350
351 /* the opcode, writing data to DCC */
352 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
353 if (retval != ERROR_OK)
354 return retval;
355
356 return dpmv8_read_dcc(armv8, data, &dpm->dscr);
357 }
358
359 static int dpmv8_instr_read_data_dcc_64(struct arm_dpm *dpm,
360 uint32_t opcode, uint64_t *data)
361 {
362 struct armv8_common *armv8 = dpm->arm->arch_info;
363 int retval;
364
365 /* the opcode, writing data to DCC */
366 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
367 if (retval != ERROR_OK)
368 return retval;
369
370 return dpmv8_read_dcc_64(armv8, data, &dpm->dscr);
371 }
372
373 static int dpmv8_instr_read_data_r0(struct arm_dpm *dpm,
374 uint32_t opcode, uint32_t *data)
375 {
376 struct armv8_common *armv8 = dpm->arm->arch_info;
377 int retval;
378
379 /* the opcode, writing data to R0 */
380 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
381 if (retval != ERROR_OK)
382 return retval;
383
384 /* write R0 to DCC */
385 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, WRITE_REG_DTRTX), &dpm->dscr);
386 if (retval != ERROR_OK)
387 return retval;
388
389 return dpmv8_read_dcc(armv8, data, &dpm->dscr);
390 }
391
392 static int dpmv8_instr_read_data_r0_64(struct arm_dpm *dpm,
393 uint32_t opcode, uint64_t *data)
394 {
395 struct armv8_common *armv8 = dpm->arm->arch_info;
396 int retval;
397
398 if (dpm->arm->core_state != ARM_STATE_AARCH64) {
399 uint32_t tmp;
400 retval = dpmv8_instr_read_data_r0(dpm, opcode, &tmp);
401 if (retval == ERROR_OK)
402 *data = tmp;
403 return retval;
404 }
405
406 /* the opcode, writing data to R0 */
407 retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
408 if (retval != ERROR_OK)
409 return retval;
410
411 /* write R0 to DCC */
412 retval = dpmv8_exec_opcode(dpm, ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0), &dpm->dscr);
413 if (retval != ERROR_OK)
414 return retval;
415
416 return dpmv8_read_dcc_64(armv8, data, &dpm->dscr);
417 }
418
419 #if 0
420 static int dpmv8_bpwp_enable(struct arm_dpm *dpm, unsigned index_t,
421 target_addr_t addr, uint32_t control)
422 {
423 struct armv8_common *armv8 = dpm->arm->arch_info;
424 uint32_t vr = armv8->debug_base;
425 uint32_t cr = armv8->debug_base;
426 int retval;
427
428 switch (index_t) {
429 case 0 ... 15: /* breakpoints */
430 vr += CPUV8_DBG_BVR_BASE;
431 cr += CPUV8_DBG_BCR_BASE;
432 break;
433 case 16 ... 31: /* watchpoints */
434 vr += CPUV8_DBG_WVR_BASE;
435 cr += CPUV8_DBG_WCR_BASE;
436 index_t -= 16;
437 break;
438 default:
439 return ERROR_FAIL;
440 }
441 vr += 16 * index_t;
442 cr += 16 * index_t;
443
444 LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x",
445 (unsigned) vr, (unsigned) cr);
446
447 retval = mem_ap_write_atomic_u32(armv8->debug_ap, vr, addr);
448 if (retval != ERROR_OK)
449 return retval;
450 return mem_ap_write_atomic_u32(armv8->debug_ap, cr, control);
451 }
452 #endif
453
454 static int dpmv8_bpwp_disable(struct arm_dpm *dpm, unsigned index_t)
455 {
456 struct armv8_common *armv8 = dpm->arm->arch_info;
457 uint32_t cr;
458
459 switch (index_t) {
460 case 0 ... 15:
461 cr = armv8->debug_base + CPUV8_DBG_BCR_BASE;
462 break;
463 case 16 ... 31:
464 cr = armv8->debug_base + CPUV8_DBG_WCR_BASE;
465 index_t -= 16;
466 break;
467 default:
468 return ERROR_FAIL;
469 }
470 cr += 16 * index_t;
471
472 LOG_DEBUG("A: bpwp disable, cr %08x", (unsigned) cr);
473
474 /* clear control register */
475 return mem_ap_write_atomic_u32(armv8->debug_ap, cr, 0);
476 }
477
478 /*
479 * Coprocessor support
480 */
481
482 /* Read coprocessor */
483 static int dpmv8_mrc(struct target *target, int cpnum,
484 uint32_t op1, uint32_t op2, uint32_t crn, uint32_t crm,
485 uint32_t *value)
486 {
487 struct arm *arm = target_to_arm(target);
488 struct arm_dpm *dpm = arm->dpm;
489 int retval;
490
491 retval = dpm->prepare(dpm);
492 if (retval != ERROR_OK)
493 return retval;
494
495 LOG_DEBUG("MRC p%d, %d, r0, c%d, c%d, %d", cpnum,
496 (int) op1, (int) crn,
497 (int) crm, (int) op2);
498
499 /* read coprocessor register into R0; return via DCC */
500 retval = dpm->instr_read_data_r0(dpm,
501 ARMV4_5_MRC(cpnum, op1, 0, crn, crm, op2),
502 value);
503
504 /* (void) */ dpm->finish(dpm);
505 return retval;
506 }
507
508 static int dpmv8_mcr(struct target *target, int cpnum,
509 uint32_t op1, uint32_t op2, uint32_t crn, uint32_t crm,
510 uint32_t value)
511 {
512 struct arm *arm = target_to_arm(target);
513 struct arm_dpm *dpm = arm->dpm;
514 int retval;
515
516 retval = dpm->prepare(dpm);
517 if (retval != ERROR_OK)
518 return retval;
519
520 LOG_DEBUG("MCR p%d, %d, r0, c%d, c%d, %d", cpnum,
521 (int) op1, (int) crn,
522 (int) crm, (int) op2);
523
524 /* read DCC into r0; then write coprocessor register from R0 */
525 retval = dpm->instr_write_data_r0(dpm,
526 ARMV4_5_MCR(cpnum, op1, 0, crn, crm, op2),
527 value);
528
529 /* (void) */ dpm->finish(dpm);
530 return retval;
531 }
532
533 /*----------------------------------------------------------------------*/
534
535 /*
536 * Register access utilities
537 */
538
539 int armv8_dpm_modeswitch(struct arm_dpm *dpm, enum arm_mode mode)
540 {
541 struct armv8_common *armv8 = (struct armv8_common *)dpm->arm->arch_info;
542 int retval = ERROR_OK;
543 unsigned int target_el;
544 enum arm_state core_state;
545 uint32_t cpsr;
546
547 /* restore previous mode */
548 if (mode == ARM_MODE_ANY) {
549 cpsr = buf_get_u32(dpm->arm->cpsr->value, 0, 32);
550
551 LOG_DEBUG("restoring mode, cpsr = 0x%08"PRIx32, cpsr);
552
553 } else {
554 LOG_DEBUG("setting mode 0x%x", mode);
555 cpsr = mode;
556 }
557
558 switch (cpsr & 0x1f) {
559 /* aarch32 modes */
560 case ARM_MODE_USR:
561 target_el = 0;
562 break;
563 case ARM_MODE_SVC:
564 case ARM_MODE_ABT:
565 case ARM_MODE_IRQ:
566 case ARM_MODE_FIQ:
567 case ARM_MODE_SYS:
568 target_el = 1;
569 break;
570 /*
571 * TODO: handle ARM_MODE_HYP
572 * case ARM_MODE_HYP:
573 * target_el = 2;
574 * break;
575 */
576 case ARM_MODE_MON:
577 target_el = 3;
578 break;
579 /* aarch64 modes */
580 default:
581 target_el = (cpsr >> 2) & 3;
582 }
583
584 if (target_el > SYSTEM_CUREL_EL3) {
585 LOG_ERROR("%s: Invalid target exception level %i", __func__, target_el);
586 return ERROR_FAIL;
587 }
588
589 LOG_DEBUG("target_el = %i, last_el = %i", target_el, dpm->last_el);
590 if (target_el > dpm->last_el) {
591 retval = dpm->instr_execute(dpm,
592 armv8_opcode(armv8, ARMV8_OPC_DCPS) | target_el);
593
594 /* DCPS clobbers registers just like an exception taken */
595 armv8_dpm_handle_exception(dpm, false);
596 } else {
597 core_state = armv8_dpm_get_core_state(dpm);
598 if (core_state != ARM_STATE_AARCH64) {
599 /* cannot do DRPS/ERET when already in EL0 */
600 if (dpm->last_el != 0) {
601 /* load SPSR with the desired mode and execute DRPS */
602 LOG_DEBUG("SPSR = 0x%08"PRIx32, cpsr);
603 retval = dpm->instr_write_data_r0(dpm,
604 ARMV8_MSR_GP_XPSR_T1(1, 0, 15), cpsr);
605 if (retval == ERROR_OK)
606 retval = dpm->instr_execute(dpm, armv8_opcode(armv8, ARMV8_OPC_DRPS));
607 }
608 } else {
609 /*
610 * need to execute multiple DRPS instructions until target_el
611 * is reached
612 */
613 while (retval == ERROR_OK && dpm->last_el != target_el) {
614 unsigned int cur_el = dpm->last_el;
615 retval = dpm->instr_execute(dpm, armv8_opcode(armv8, ARMV8_OPC_DRPS));
616 if (cur_el == dpm->last_el) {
617 LOG_INFO("Cannot reach EL %i, SPSR corrupted?", target_el);
618 break;
619 }
620 }
621 }
622
623 /* On executing DRPS, DSPSR and DLR become UNKNOWN, mark them as dirty */
624 dpm->arm->cpsr->dirty = true;
625 dpm->arm->pc->dirty = true;
626
627 /*
628 * re-evaluate the core state, we might be in Aarch32 state now
629 * we rely on dpm->dscr being up-to-date
630 */
631 core_state = armv8_dpm_get_core_state(dpm);
632 armv8_select_opcodes(armv8, core_state == ARM_STATE_AARCH64);
633 armv8_select_reg_access(armv8, core_state == ARM_STATE_AARCH64);
634 }
635
636 return retval;
637 }
638
639 /*
640 * Common register read, relies on armv8_select_reg_access() having been called.
641 */
642 static int dpmv8_read_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
643 {
644 struct armv8_common *armv8 = dpm->arm->arch_info;
645 int retval = ERROR_FAIL;
646
647 if (r->size <= 64) {
648 uint64_t value_64;
649 retval = armv8->read_reg_u64(armv8, regnum, &value_64);
650
651 if (retval == ERROR_OK) {
652 r->valid = true;
653 r->dirty = false;
654 buf_set_u64(r->value, 0, r->size, value_64);
655 if (r->size == 64)
656 LOG_DEBUG("READ: %s, %16.8llx", r->name, (unsigned long long) value_64);
657 else
658 LOG_DEBUG("READ: %s, %8.8x", r->name, (unsigned int) value_64);
659 }
660 } else if (r->size <= 128) {
661 uint64_t lvalue = 0, hvalue = 0;
662 retval = armv8->read_reg_u128(armv8, regnum, &lvalue, &hvalue);
663
664 if (retval == ERROR_OK) {
665 r->valid = true;
666 r->dirty = false;
667
668 buf_set_u64(r->value, 0, 64, lvalue);
669 buf_set_u64(r->value + 8, 0, r->size - 64, hvalue);
670
671 LOG_DEBUG("READ: %s, lvalue=%16.8llx", r->name, (unsigned long long) lvalue);
672 LOG_DEBUG("READ: %s, hvalue=%16.8llx", r->name, (unsigned long long) hvalue);
673 }
674 }
675
676 if (retval != ERROR_OK)
677 LOG_ERROR("Failed to read %s register", r->name);
678
679 return retval;
680 }
681
682 /*
683 * Common register write, relies on armv8_select_reg_access() having been called.
684 */
685 static int dpmv8_write_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
686 {
687 struct armv8_common *armv8 = dpm->arm->arch_info;
688 int retval = ERROR_FAIL;
689
690 if (r->size <= 64) {
691 uint64_t value_64;
692
693 value_64 = buf_get_u64(r->value, 0, r->size);
694 retval = armv8->write_reg_u64(armv8, regnum, value_64);
695
696 if (retval == ERROR_OK) {
697 r->dirty = false;
698 if (r->size == 64)
699 LOG_DEBUG("WRITE: %s, %16.8llx", r->name, (unsigned long long)value_64);
700 else
701 LOG_DEBUG("WRITE: %s, %8.8x", r->name, (unsigned int)value_64);
702 }
703 } else if (r->size <= 128) {
704 uint64_t lvalue, hvalue;
705
706 lvalue = buf_get_u64(r->value, 0, 64);
707 hvalue = buf_get_u64(r->value + 8, 0, r->size - 64);
708 retval = armv8->write_reg_u128(armv8, regnum, lvalue, hvalue);
709
710 if (retval == ERROR_OK) {
711 r->dirty = false;
712
713 LOG_DEBUG("WRITE: %s, lvalue=%16.8llx", r->name, (unsigned long long) lvalue);
714 LOG_DEBUG("WRITE: %s, hvalue=%16.8llx", r->name, (unsigned long long) hvalue);
715 }
716 }
717
718 if (retval != ERROR_OK)
719 LOG_ERROR("Failed to write %s register", r->name);
720
721 return retval;
722 }
723
724 /**
725 * Read basic registers of the current context: R0 to R15, and CPSR;
726 * sets the core mode (such as USR or IRQ) and state (such as ARM or Thumb).
727 * In normal operation this is called on entry to halting debug state,
728 * possibly after some other operations supporting restore of debug state
729 * or making sure the CPU is fully idle (drain write buffer, etc).
730 */
731 int armv8_dpm_read_current_registers(struct arm_dpm *dpm)
732 {
733 struct arm *arm = dpm->arm;
734 struct armv8_common *armv8 = (struct armv8_common *)arm->arch_info;
735 struct reg_cache *cache;
736 struct reg *r;
737 uint32_t cpsr;
738 int retval;
739
740 retval = dpm->prepare(dpm);
741 if (retval != ERROR_OK)
742 return retval;
743
744 cache = arm->core_cache;
745
746 /* read R0 first (it's used for scratch), then CPSR */
747 r = cache->reg_list + ARMV8_R0;
748 if (!r->valid) {
749 retval = dpmv8_read_reg(dpm, r, ARMV8_R0);
750 if (retval != ERROR_OK)
751 goto fail;
752 }
753 r->dirty = true;
754
755 /* read R1, too, it will be clobbered during memory access */
756 r = cache->reg_list + ARMV8_R1;
757 if (!r->valid) {
758 retval = dpmv8_read_reg(dpm, r, ARMV8_R1);
759 if (retval != ERROR_OK)
760 goto fail;
761 }
762
763 /* read cpsr to r0 and get it back */
764 retval = dpm->instr_read_data_r0(dpm,
765 armv8_opcode(armv8, READ_REG_DSPSR), &cpsr);
766 if (retval != ERROR_OK)
767 goto fail;
768
769 /* update core mode and state */
770 armv8_set_cpsr(arm, cpsr);
771
772 for (unsigned int i = ARMV8_PC; i < cache->num_regs ; i++) {
773 struct arm_reg *arm_reg;
774
775 r = armv8_reg_current(arm, i);
776 if (!r->exist || r->valid)
777 continue;
778
779 /* Skip reading FP-SIMD registers */
780 if (r->number >= ARMV8_V0 && r->number <= ARMV8_FPCR)
781 continue;
782
783 /*
784 * Only read registers that are available from the
785 * current EL (or core mode).
786 */
787 arm_reg = r->arch_info;
788 if (arm_reg->mode != ARM_MODE_ANY &&
789 dpm->last_el != armv8_curel_from_core_mode(arm_reg->mode))
790 continue;
791
792 /* Special case: ARM_MODE_SYS has no SPSR at EL1 */
793 if (r->number == ARMV8_SPSR_EL1 && arm->core_mode == ARM_MODE_SYS)
794 continue;
795
796 retval = dpmv8_read_reg(dpm, r, i);
797 if (retval != ERROR_OK)
798 goto fail;
799
800 }
801
802 fail:
803 dpm->finish(dpm);
804 return retval;
805 }
806
807 /* Avoid needless I/O ... leave breakpoints and watchpoints alone
808 * unless they're removed, or need updating because of single-stepping
809 * or running debugger code.
810 */
811 static int dpmv8_maybe_update_bpwp(struct arm_dpm *dpm, bool bpwp,
812 struct dpm_bpwp *xp, bool *set_p)
813 {
814 int retval = ERROR_OK;
815 bool disable;
816
817 if (!set_p) {
818 if (!xp->dirty)
819 goto done;
820 xp->dirty = false;
821 /* removed or startup; we must disable it */
822 disable = true;
823 } else if (bpwp) {
824 if (!xp->dirty)
825 goto done;
826 /* disabled, but we must set it */
827 xp->dirty = disable = false;
828 *set_p = true;
829 } else {
830 if (!*set_p)
831 goto done;
832 /* set, but we must temporarily disable it */
833 xp->dirty = disable = true;
834 *set_p = false;
835 }
836
837 if (disable)
838 retval = dpm->bpwp_disable(dpm, xp->number);
839 else
840 retval = dpm->bpwp_enable(dpm, xp->number,
841 xp->address, xp->control);
842
843 if (retval != ERROR_OK)
844 LOG_ERROR("%s: can't %s HW %spoint %d",
845 disable ? "disable" : "enable",
846 target_name(dpm->arm->target),
847 (xp->number < 16) ? "break" : "watch",
848 xp->number & 0xf);
849 done:
850 return retval;
851 }
852
853 static int dpmv8_add_breakpoint(struct target *target, struct breakpoint *bp);
854
855 /**
856 * Writes all modified core registers for all processor modes. In normal
857 * operation this is called on exit from halting debug state.
858 *
859 * @param dpm: represents the processor
860 * @param bpwp: true ensures breakpoints and watchpoints are set,
861 * false ensures they are cleared
862 */
863 int armv8_dpm_write_dirty_registers(struct arm_dpm *dpm, bool bpwp)
864 {
865 struct arm *arm = dpm->arm;
866 struct reg_cache *cache = arm->core_cache;
867 int retval;
868
869 retval = dpm->prepare(dpm);
870 if (retval != ERROR_OK)
871 goto done;
872
873 /* If we're managing hardware breakpoints for this core, enable
874 * or disable them as requested.
875 *
876 * REVISIT We don't yet manage them for ANY cores. Eventually
877 * we should be able to assume we handle them; but until then,
878 * cope with the hand-crafted breakpoint code.
879 */
880 if (arm->target->type->add_breakpoint == dpmv8_add_breakpoint) {
881 for (unsigned i = 0; i < dpm->nbp; i++) {
882 struct dpm_bp *dbp = dpm->dbp + i;
883 struct breakpoint *bp = dbp->bp;
884
885 retval = dpmv8_maybe_update_bpwp(dpm, bpwp, &dbp->bpwp,
886 bp ? &bp->is_set : NULL);
887 if (retval != ERROR_OK)
888 goto done;
889 }
890 }
891
892 /* enable/disable watchpoints */
893 for (unsigned i = 0; i < dpm->nwp; i++) {
894 struct dpm_wp *dwp = dpm->dwp + i;
895 struct watchpoint *wp = dwp->wp;
896
897 retval = dpmv8_maybe_update_bpwp(dpm, bpwp, &dwp->bpwp,
898 wp ? &wp->is_set : NULL);
899 if (retval != ERROR_OK)
900 goto done;
901 }
902
903 /* NOTE: writes to breakpoint and watchpoint registers might
904 * be queued, and need (efficient/batched) flushing later.
905 */
906
907 /* Restore original core mode and state */
908 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
909 if (retval != ERROR_OK)
910 goto done;
911
912 /* check everything except our scratch register R0 */
913 for (unsigned i = 1; i < cache->num_regs; i++) {
914 struct arm_reg *r;
915
916 /* skip non-existent */
917 if (!cache->reg_list[i].exist)
918 continue;
919 /* skip PC and CPSR */
920 if (i == ARMV8_PC || i == ARMV8_XPSR)
921 continue;
922 /* skip invalid */
923 if (!cache->reg_list[i].valid)
924 continue;
925 /* skip non-dirty */
926 if (!cache->reg_list[i].dirty)
927 continue;
928
929 /* skip all registers not on the current EL */
930 r = cache->reg_list[i].arch_info;
931 if (r->mode != ARM_MODE_ANY &&
932 dpm->last_el != armv8_curel_from_core_mode(r->mode))
933 continue;
934
935 retval = dpmv8_write_reg(dpm, &cache->reg_list[i], i);
936 if (retval != ERROR_OK)
937 break;
938 }
939
940 /* flush CPSR and PC */
941 if (retval == ERROR_OK)
942 retval = dpmv8_write_reg(dpm, &cache->reg_list[ARMV8_XPSR], ARMV8_XPSR);
943 if (retval == ERROR_OK)
944 retval = dpmv8_write_reg(dpm, &cache->reg_list[ARMV8_PC], ARMV8_PC);
945 /* flush R0 -- it's *very* dirty by now */
946 if (retval == ERROR_OK)
947 retval = dpmv8_write_reg(dpm, &cache->reg_list[0], 0);
948 if (retval == ERROR_OK)
949 dpm->instr_cpsr_sync(dpm);
950 done:
951 dpm->finish(dpm);
952 return retval;
953 }
954
955 /*
956 * Standard ARM register accessors ... there are three methods
957 * in "struct arm", to support individual read/write and bulk read
958 * of registers.
959 */
960
961 static int armv8_dpm_read_core_reg(struct target *target, struct reg *r,
962 int regnum, enum arm_mode mode)
963 {
964 struct arm *arm = target_to_arm(target);
965 struct arm_dpm *dpm = target_to_arm(target)->dpm;
966 int retval;
967 int max = arm->core_cache->num_regs;
968
969 if (regnum < 0 || regnum >= max)
970 return ERROR_COMMAND_SYNTAX_ERROR;
971
972 /*
973 * REVISIT what happens if we try to read SPSR in a core mode
974 * which has no such register?
975 */
976 retval = dpm->prepare(dpm);
977 if (retval != ERROR_OK)
978 return retval;
979
980 retval = dpmv8_read_reg(dpm, r, regnum);
981 if (retval != ERROR_OK)
982 goto fail;
983
984 fail:
985 /* (void) */ dpm->finish(dpm);
986 return retval;
987 }
988
989 static int armv8_dpm_write_core_reg(struct target *target, struct reg *r,
990 int regnum, enum arm_mode mode, uint8_t *value)
991 {
992 struct arm *arm = target_to_arm(target);
993 struct arm_dpm *dpm = target_to_arm(target)->dpm;
994 int retval;
995 int max = arm->core_cache->num_regs;
996
997 if (regnum < 0 || regnum > max)
998 return ERROR_COMMAND_SYNTAX_ERROR;
999
1000 /* REVISIT what happens if we try to write SPSR in a core mode
1001 * which has no such register?
1002 */
1003
1004 retval = dpm->prepare(dpm);
1005 if (retval != ERROR_OK)
1006 return retval;
1007
1008 retval = dpmv8_write_reg(dpm, r, regnum);
1009
1010 /* always clean up, regardless of error */
1011 dpm->finish(dpm);
1012
1013 return retval;
1014 }
1015
1016 static int armv8_dpm_full_context(struct target *target)
1017 {
1018 struct arm *arm = target_to_arm(target);
1019 struct arm_dpm *dpm = arm->dpm;
1020 struct reg_cache *cache = arm->core_cache;
1021 int retval;
1022 bool did_read;
1023
1024 retval = dpm->prepare(dpm);
1025 if (retval != ERROR_OK)
1026 goto done;
1027
1028 do {
1029 enum arm_mode mode = ARM_MODE_ANY;
1030
1031 did_read = false;
1032
1033 /* We "know" arm_dpm_read_current_registers() was called so
1034 * the unmapped registers (R0..R7, PC, AND CPSR) and some
1035 * view of R8..R14 are current. We also "know" oddities of
1036 * register mapping: special cases for R8..R12 and SPSR.
1037 *
1038 * Pick some mode with unread registers and read them all.
1039 * Repeat until done.
1040 */
1041 for (unsigned i = 0; i < cache->num_regs; i++) {
1042 struct arm_reg *r;
1043
1044 if (!cache->reg_list[i].exist || cache->reg_list[i].valid)
1045 continue;
1046 r = cache->reg_list[i].arch_info;
1047
1048 /* may need to pick a mode and set CPSR */
1049 if (!did_read) {
1050 did_read = true;
1051 mode = r->mode;
1052
1053 /* For regular (ARM_MODE_ANY) R8..R12
1054 * in case we've entered debug state
1055 * in FIQ mode we need to patch mode.
1056 */
1057 if (mode != ARM_MODE_ANY)
1058 retval = armv8_dpm_modeswitch(dpm, mode);
1059 else
1060 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_USR);
1061
1062 if (retval != ERROR_OK)
1063 goto done;
1064 }
1065 if (r->mode != mode)
1066 continue;
1067
1068 /* CPSR was read, so "R16" must mean SPSR */
1069 retval = dpmv8_read_reg(dpm,
1070 &cache->reg_list[i],
1071 (r->num == 16) ? 17 : r->num);
1072 if (retval != ERROR_OK)
1073 goto done;
1074 }
1075
1076 } while (did_read);
1077
1078 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
1079 /* (void) */ dpm->finish(dpm);
1080 done:
1081 return retval;
1082 }
1083
1084
1085 /*----------------------------------------------------------------------*/
1086
1087 /*
1088 * Breakpoint and Watchpoint support.
1089 *
1090 * Hardware {break,watch}points are usually left active, to minimize
1091 * debug entry/exit costs. When they are set or cleared, it's done in
1092 * batches. Also, DPM-conformant hardware can update debug registers
1093 * regardless of whether the CPU is running or halted ... though that
1094 * fact isn't currently leveraged.
1095 */
1096
1097 static int dpmv8_bpwp_setup(struct arm_dpm *dpm, struct dpm_bpwp *xp,
1098 uint32_t addr, uint32_t length)
1099 {
1100 uint32_t control;
1101
1102 control = (1 << 0) /* enable */
1103 | (3 << 1); /* both user and privileged access */
1104
1105 /* Match 1, 2, or all 4 byte addresses in this word.
1106 *
1107 * FIXME: v7 hardware allows lengths up to 2 GB for BP and WP.
1108 * Support larger length, when addr is suitably aligned. In
1109 * particular, allow watchpoints on 8 byte "double" values.
1110 *
1111 * REVISIT allow watchpoints on unaligned 2-bit values; and on
1112 * v7 hardware, unaligned 4-byte ones too.
1113 */
1114 switch (length) {
1115 case 1:
1116 control |= (1 << (addr & 3)) << 5;
1117 break;
1118 case 2:
1119 /* require 2-byte alignment */
1120 if (!(addr & 1)) {
1121 control |= (3 << (addr & 2)) << 5;
1122 break;
1123 }
1124 /* FALL THROUGH */
1125 case 4:
1126 /* require 4-byte alignment */
1127 if (!(addr & 3)) {
1128 control |= 0xf << 5;
1129 break;
1130 }
1131 /* FALL THROUGH */
1132 default:
1133 LOG_ERROR("unsupported {break,watch}point length/alignment");
1134 return ERROR_COMMAND_SYNTAX_ERROR;
1135 }
1136
1137 /* other shared control bits:
1138 * bits 15:14 == 0 ... both secure and nonsecure states (v6.1+ only)
1139 * bit 20 == 0 ... not linked to a context ID
1140 * bit 28:24 == 0 ... not ignoring N LSBs (v7 only)
1141 */
1142
1143 xp->address = addr & ~3;
1144 xp->control = control;
1145 xp->dirty = true;
1146
1147 LOG_DEBUG("BPWP: addr %8.8" PRIx32 ", control %" PRIx32 ", number %d",
1148 xp->address, control, xp->number);
1149
1150 /* hardware is updated in write_dirty_registers() */
1151 return ERROR_OK;
1152 }
1153
1154 static int dpmv8_add_breakpoint(struct target *target, struct breakpoint *bp)
1155 {
1156 struct arm *arm = target_to_arm(target);
1157 struct arm_dpm *dpm = arm->dpm;
1158 int retval = ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1159
1160 if (bp->length < 2)
1161 return ERROR_COMMAND_SYNTAX_ERROR;
1162 if (!dpm->bpwp_enable)
1163 return retval;
1164
1165 /* FIXME we need a generic solution for software breakpoints. */
1166 if (bp->type == BKPT_SOFT)
1167 LOG_DEBUG("using HW bkpt, not SW...");
1168
1169 for (unsigned i = 0; i < dpm->nbp; i++) {
1170 if (!dpm->dbp[i].bp) {
1171 retval = dpmv8_bpwp_setup(dpm, &dpm->dbp[i].bpwp,
1172 bp->address, bp->length);
1173 if (retval == ERROR_OK)
1174 dpm->dbp[i].bp = bp;
1175 break;
1176 }
1177 }
1178
1179 return retval;
1180 }
1181
1182 static int dpmv8_remove_breakpoint(struct target *target, struct breakpoint *bp)
1183 {
1184 struct arm *arm = target_to_arm(target);
1185 struct arm_dpm *dpm = arm->dpm;
1186 int retval = ERROR_COMMAND_SYNTAX_ERROR;
1187
1188 for (unsigned i = 0; i < dpm->nbp; i++) {
1189 if (dpm->dbp[i].bp == bp) {
1190 dpm->dbp[i].bp = NULL;
1191 dpm->dbp[i].bpwp.dirty = true;
1192
1193 /* hardware is updated in write_dirty_registers() */
1194 retval = ERROR_OK;
1195 break;
1196 }
1197 }
1198
1199 return retval;
1200 }
1201
1202 static int dpmv8_watchpoint_setup(struct arm_dpm *dpm, unsigned index_t,
1203 struct watchpoint *wp)
1204 {
1205 int retval;
1206 struct dpm_wp *dwp = dpm->dwp + index_t;
1207 uint32_t control;
1208
1209 /* this hardware doesn't support data value matching or masking */
1210 if (wp->value || wp->mask != ~(uint32_t)0) {
1211 LOG_DEBUG("watchpoint values and masking not supported");
1212 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1213 }
1214
1215 retval = dpmv8_bpwp_setup(dpm, &dwp->bpwp, wp->address, wp->length);
1216 if (retval != ERROR_OK)
1217 return retval;
1218
1219 control = dwp->bpwp.control;
1220 switch (wp->rw) {
1221 case WPT_READ:
1222 control |= 1 << 3;
1223 break;
1224 case WPT_WRITE:
1225 control |= 2 << 3;
1226 break;
1227 case WPT_ACCESS:
1228 control |= 3 << 3;
1229 break;
1230 }
1231 dwp->bpwp.control = control;
1232
1233 dpm->dwp[index_t].wp = wp;
1234
1235 return retval;
1236 }
1237
1238 static int dpmv8_add_watchpoint(struct target *target, struct watchpoint *wp)
1239 {
1240 struct arm *arm = target_to_arm(target);
1241 struct arm_dpm *dpm = arm->dpm;
1242 int retval = ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1243
1244 if (dpm->bpwp_enable) {
1245 for (unsigned i = 0; i < dpm->nwp; i++) {
1246 if (!dpm->dwp[i].wp) {
1247 retval = dpmv8_watchpoint_setup(dpm, i, wp);
1248 break;
1249 }
1250 }
1251 }
1252
1253 return retval;
1254 }
1255
1256 static int dpmv8_remove_watchpoint(struct target *target, struct watchpoint *wp)
1257 {
1258 struct arm *arm = target_to_arm(target);
1259 struct arm_dpm *dpm = arm->dpm;
1260 int retval = ERROR_COMMAND_SYNTAX_ERROR;
1261
1262 for (unsigned i = 0; i < dpm->nwp; i++) {
1263 if (dpm->dwp[i].wp == wp) {
1264 dpm->dwp[i].wp = NULL;
1265 dpm->dwp[i].bpwp.dirty = true;
1266
1267 /* hardware is updated in write_dirty_registers() */
1268 retval = ERROR_OK;
1269 break;
1270 }
1271 }
1272
1273 return retval;
1274 }
1275
1276 /*
1277 * Handle exceptions taken in debug state. This happens mostly for memory
1278 * accesses that violated a MMU policy. Taking an exception while in debug
1279 * state clobbers certain state registers on the target exception level.
1280 * Just mark those registers dirty so that they get restored on resume.
1281 * This works both for Aarch32 and Aarch64 states.
1282 *
1283 * This function must not perform any actions that trigger another exception
1284 * or a recursion will happen.
1285 */
1286 void armv8_dpm_handle_exception(struct arm_dpm *dpm, bool do_restore)
1287 {
1288 struct armv8_common *armv8 = dpm->arm->arch_info;
1289 struct reg_cache *cache = dpm->arm->core_cache;
1290 enum arm_state core_state;
1291 uint64_t dlr;
1292 uint32_t dspsr;
1293 unsigned int el;
1294
1295 static const int clobbered_regs_by_el[3][5] = {
1296 { ARMV8_PC, ARMV8_XPSR, ARMV8_ELR_EL1, ARMV8_ESR_EL1, ARMV8_SPSR_EL1 },
1297 { ARMV8_PC, ARMV8_XPSR, ARMV8_ELR_EL2, ARMV8_ESR_EL2, ARMV8_SPSR_EL2 },
1298 { ARMV8_PC, ARMV8_XPSR, ARMV8_ELR_EL3, ARMV8_ESR_EL3, ARMV8_SPSR_EL3 },
1299 };
1300
1301 el = (dpm->dscr >> 8) & 3;
1302
1303 /* safety check, must not happen since EL0 cannot be a target for an exception */
1304 if (el < SYSTEM_CUREL_EL1 || el > SYSTEM_CUREL_EL3) {
1305 LOG_ERROR("%s: EL %i is invalid, DSCR corrupted?", __func__, el);
1306 return;
1307 }
1308
1309 /* Clear sticky error */
1310 mem_ap_write_u32(armv8->debug_ap,
1311 armv8->debug_base + CPUV8_DBG_DRCR, DRCR_CSE);
1312
1313 armv8->read_reg_u64(armv8, ARMV8_XPSR, &dlr);
1314 dspsr = dlr;
1315 armv8->read_reg_u64(armv8, ARMV8_PC, &dlr);
1316
1317 LOG_DEBUG("Exception taken to EL %i, DLR=0x%016"PRIx64" DSPSR=0x%08"PRIx32,
1318 el, dlr, dspsr);
1319
1320 /* mark all clobbered registers as dirty */
1321 for (int i = 0; i < 5; i++)
1322 cache->reg_list[clobbered_regs_by_el[el-1][i]].dirty = true;
1323
1324 /*
1325 * re-evaluate the core state, we might be in Aarch64 state now
1326 * we rely on dpm->dscr being up-to-date
1327 */
1328 core_state = armv8_dpm_get_core_state(dpm);
1329 armv8_select_opcodes(armv8, core_state == ARM_STATE_AARCH64);
1330 armv8_select_reg_access(armv8, core_state == ARM_STATE_AARCH64);
1331
1332 if (do_restore)
1333 armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
1334 }
1335
1336 /*----------------------------------------------------------------------*/
1337
1338 /*
1339 * Other debug and support utilities
1340 */
1341
1342 void armv8_dpm_report_dscr(struct arm_dpm *dpm, uint32_t dscr)
1343 {
1344 struct target *target = dpm->arm->target;
1345
1346 dpm->dscr = dscr;
1347 dpm->last_el = (dscr >> 8) & 3;
1348
1349 /* Examine debug reason */
1350 switch (DSCR_ENTRY(dscr)) {
1351 /* FALL THROUGH -- assume a v6 core in abort mode */
1352 case DSCRV8_ENTRY_EXT_DEBUG: /* EDBGRQ */
1353 target->debug_reason = DBG_REASON_DBGRQ;
1354 break;
1355 case DSCRV8_ENTRY_HALT_STEP_EXECLU: /* HALT step */
1356 case DSCRV8_ENTRY_HALT_STEP_NORMAL: /* Halt step*/
1357 case DSCRV8_ENTRY_HALT_STEP:
1358 target->debug_reason = DBG_REASON_SINGLESTEP;
1359 break;
1360 case DSCRV8_ENTRY_HLT: /* HLT instruction (software breakpoint) */
1361 case DSCRV8_ENTRY_BKPT: /* SW BKPT (?) */
1362 case DSCRV8_ENTRY_RESET_CATCH: /* Reset catch */
1363 case DSCRV8_ENTRY_OS_UNLOCK: /*OS unlock catch*/
1364 case DSCRV8_ENTRY_SW_ACCESS_DBG: /*SW access dbg register*/
1365 target->debug_reason = DBG_REASON_BREAKPOINT;
1366 break;
1367 case DSCRV8_ENTRY_WATCHPOINT: /* asynch watchpoint */
1368 target->debug_reason = DBG_REASON_WATCHPOINT;
1369 break;
1370 case DSCRV8_ENTRY_EXCEPTION_CATCH: /*exception catch*/
1371 target->debug_reason = DBG_REASON_EXC_CATCH;
1372 break;
1373 default:
1374 target->debug_reason = DBG_REASON_UNDEFINED;
1375 break;
1376 }
1377
1378 }
1379
1380 /*----------------------------------------------------------------------*/
1381
1382 /*
1383 * Setup and management support.
1384 */
1385
1386 /**
1387 * Hooks up this DPM to its associated target; call only once.
1388 * Initially this only covers the register cache.
1389 *
1390 * Oh, and watchpoints. Yeah.
1391 */
1392 int armv8_dpm_setup(struct arm_dpm *dpm)
1393 {
1394 struct arm *arm = dpm->arm;
1395 struct target *target = arm->target;
1396 struct reg_cache *cache;
1397 arm->dpm = dpm;
1398
1399 /* register access setup */
1400 arm->full_context = armv8_dpm_full_context;
1401 arm->read_core_reg = armv8_dpm_read_core_reg;
1402 arm->write_core_reg = armv8_dpm_write_core_reg;
1403
1404 if (!arm->core_cache) {
1405 cache = armv8_build_reg_cache(target);
1406 if (!cache)
1407 return ERROR_FAIL;
1408 }
1409
1410 /* coprocessor access setup */
1411 arm->mrc = dpmv8_mrc;
1412 arm->mcr = dpmv8_mcr;
1413
1414 dpm->prepare = dpmv8_dpm_prepare;
1415 dpm->finish = dpmv8_dpm_finish;
1416
1417 dpm->instr_execute = dpmv8_instr_execute;
1418 dpm->instr_write_data_dcc = dpmv8_instr_write_data_dcc;
1419 dpm->instr_write_data_dcc_64 = dpmv8_instr_write_data_dcc_64;
1420 dpm->instr_write_data_r0 = dpmv8_instr_write_data_r0;
1421 dpm->instr_write_data_r0_64 = dpmv8_instr_write_data_r0_64;
1422 dpm->instr_cpsr_sync = dpmv8_instr_cpsr_sync;
1423
1424 dpm->instr_read_data_dcc = dpmv8_instr_read_data_dcc;
1425 dpm->instr_read_data_dcc_64 = dpmv8_instr_read_data_dcc_64;
1426 dpm->instr_read_data_r0 = dpmv8_instr_read_data_r0;
1427 dpm->instr_read_data_r0_64 = dpmv8_instr_read_data_r0_64;
1428
1429 dpm->arm_reg_current = armv8_reg_current;
1430
1431 /* dpm->bpwp_enable = dpmv8_bpwp_enable; */
1432 dpm->bpwp_disable = dpmv8_bpwp_disable;
1433
1434 /* breakpoint setup -- optional until it works everywhere */
1435 if (!target->type->add_breakpoint) {
1436 target->type->add_breakpoint = dpmv8_add_breakpoint;
1437 target->type->remove_breakpoint = dpmv8_remove_breakpoint;
1438 }
1439
1440 /* watchpoint setup */
1441 if (!target->type->add_watchpoint) {
1442 target->type->add_watchpoint = dpmv8_add_watchpoint;
1443 target->type->remove_watchpoint = dpmv8_remove_watchpoint;
1444 }
1445
1446 /* FIXME add vector catch support */
1447
1448 dpm->nbp = 1 + ((dpm->didr >> 12) & 0xf);
1449 dpm->dbp = calloc(dpm->nbp, sizeof(*dpm->dbp));
1450
1451 dpm->nwp = 1 + ((dpm->didr >> 20) & 0xf);
1452 dpm->dwp = calloc(dpm->nwp, sizeof(*dpm->dwp));
1453
1454 if (!dpm->dbp || !dpm->dwp) {
1455 free(dpm->dbp);
1456 free(dpm->dwp);
1457 return ERROR_FAIL;
1458 }
1459
1460 LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
1461 target_name(target), dpm->nbp, dpm->nwp);
1462
1463 /* REVISIT ... and some of those breakpoints could match
1464 * execution context IDs...
1465 */
1466
1467 return ERROR_OK;
1468 }
1469
1470 /**
1471 * Reinitializes DPM state at the beginning of a new debug session
1472 * or after a reset which may have affected the debug module.
1473 */
1474 int armv8_dpm_initialize(struct arm_dpm *dpm)
1475 {
1476 /* Disable all breakpoints and watchpoints at startup. */
1477 if (dpm->bpwp_disable) {
1478 unsigned i;
1479
1480 for (i = 0; i < dpm->nbp; i++) {
1481 dpm->dbp[i].bpwp.number = i;
1482 (void) dpm->bpwp_disable(dpm, i);
1483 }
1484 for (i = 0; i < dpm->nwp; i++) {
1485 dpm->dwp[i].bpwp.number = 16 + i;
1486 (void) dpm->bpwp_disable(dpm, 16 + i);
1487 }
1488 } else
1489 LOG_WARNING("%s: can't disable breakpoints and watchpoints",
1490 target_name(dpm->arm->target));
1491
1492 return ERROR_OK;
1493 }
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