2 * Copyright (C) 2009 by David Brownell
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.
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.
22 #include "armv8_dpm.h"
23 #include <jtag/jtag.h>
25 #include "breakpoints.h"
26 #include "target_type.h"
27 #include "armv8_opcodes.h"
29 #include "helper/time_support.h"
32 #define T32_FMTITR(instr) (((instr & 0x0000FFFF) << 16) | ((instr & 0xFFFF0000) >> 16))
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.
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.
48 * Get core state from EDSCR, without necessity to retrieve CPSR
50 enum arm_state armv8_dpm_get_core_state(struct arm_dpm *dpm)
52 int el = (dpm->dscr >> 8) & 0x3;
53 int rw = (dpm->dscr >> 10) & 0xF;
58 /* find the first '0' in DSCR.RW */
59 for (pos = 3; pos >= 0; pos--) {
60 if ((rw & (1 << pos)) == 0)
65 return ARM_STATE_AARCH64;
70 /*----------------------------------------------------------------------*/
72 static int dpmv8_write_dcc(struct armv8_common *armv8, uint32_t data)
74 LOG_DEBUG("write DCC 0x%08" PRIx32, data);
75 return mem_ap_write_u32(armv8->debug_ap,
76 armv8->debug_base + CPUV8_DBG_DTRRX, data);
79 static int dpmv8_write_dcc_64(struct armv8_common *armv8, uint64_t data)
82 LOG_DEBUG("write DCC Low word 0x%08" PRIx32, (unsigned)data);
83 LOG_DEBUG("write DCC High word 0x%08" PRIx32, (unsigned)(data >> 32));
84 ret = mem_ap_write_u32(armv8->debug_ap,
85 armv8->debug_base + CPUV8_DBG_DTRRX, data);
86 ret += mem_ap_write_u32(armv8->debug_ap,
87 armv8->debug_base + CPUV8_DBG_DTRTX, data >> 32);
91 static int dpmv8_read_dcc(struct armv8_common *armv8, uint32_t *data,
94 uint32_t dscr = DSCR_ITE;
100 /* Wait for DTRRXfull */
101 long long then = timeval_ms();
102 while ((dscr & DSCR_DTR_TX_FULL) == 0) {
103 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
104 armv8->debug_base + CPUV8_DBG_DSCR,
106 if (retval != ERROR_OK)
108 if (timeval_ms() > then + 1000) {
109 LOG_ERROR("Timeout waiting for read dcc");
114 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
115 armv8->debug_base + CPUV8_DBG_DTRTX,
117 if (retval != ERROR_OK)
119 LOG_DEBUG("read DCC 0x%08" PRIx32, *data);
127 static int dpmv8_read_dcc_64(struct armv8_common *armv8, uint64_t *data,
130 uint32_t dscr = DSCR_ITE;
137 /* Wait for DTRRXfull */
138 long long then = timeval_ms();
139 while ((dscr & DSCR_DTR_TX_FULL) == 0) {
140 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
141 armv8->debug_base + CPUV8_DBG_DSCR,
143 if (retval != ERROR_OK)
145 if (timeval_ms() > then + 1000) {
146 LOG_ERROR("Timeout waiting for read dcc");
151 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
152 armv8->debug_base + CPUV8_DBG_DTRTX,
154 if (retval != ERROR_OK)
157 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
158 armv8->debug_base + CPUV8_DBG_DTRRX,
160 if (retval != ERROR_OK)
163 *data = *(uint32_t *)data | (uint64_t)higher << 32;
164 LOG_DEBUG("read DCC 0x%16.16" PRIx64, *data);
172 static int dpmv8_dpm_prepare(struct arm_dpm *dpm)
174 struct armv8_common *armv8 = dpm->arm->arch_info;
178 /* set up invariant: INSTR_COMP is set after ever DPM operation */
179 long long then = timeval_ms();
181 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
182 armv8->debug_base + CPUV8_DBG_DSCR,
184 if (retval != ERROR_OK)
186 if ((dscr & DSCR_ITE) != 0)
188 if (timeval_ms() > then + 1000) {
189 LOG_ERROR("Timeout waiting for dpm prepare");
194 /* update the stored copy of dscr */
197 /* this "should never happen" ... */
198 if (dscr & DSCR_DTR_RX_FULL) {
199 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
201 retval = mem_ap_read_u32(armv8->debug_ap,
202 armv8->debug_base + CPUV8_DBG_DTRRX, &dscr);
203 if (retval != ERROR_OK)
210 static int dpmv8_dpm_finish(struct arm_dpm *dpm)
212 /* REVISIT what could be done here? */
216 static int dpmv8_exec_opcode(struct arm_dpm *dpm,
217 uint32_t opcode, uint32_t *p_dscr)
219 struct armv8_common *armv8 = dpm->arm->arch_info;
220 uint32_t dscr = DSCR_ITE;
223 LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
228 /* Wait for InstrCompl bit to be set */
229 long long then = timeval_ms();
230 while ((dscr & DSCR_ITE) == 0) {
231 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
232 armv8->debug_base + CPUV8_DBG_DSCR, &dscr);
233 if (retval != ERROR_OK) {
234 LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode);
237 if (timeval_ms() > then + 1000) {
238 LOG_ERROR("Timeout waiting for aarch64_exec_opcode");
243 if (armv8_dpm_get_core_state(dpm) != ARM_STATE_AARCH64)
244 opcode = T32_FMTITR(opcode);
246 retval = mem_ap_write_u32(armv8->debug_ap,
247 armv8->debug_base + CPUV8_DBG_ITR, opcode);
248 if (retval != ERROR_OK)
253 retval = mem_ap_read_atomic_u32(armv8->debug_ap,
254 armv8->debug_base + CPUV8_DBG_DSCR, &dscr);
255 if (retval != ERROR_OK) {
256 LOG_ERROR("Could not read DSCR register");
259 if (timeval_ms() > then + 1000) {
260 LOG_ERROR("Timeout waiting for aarch64_exec_opcode");
263 } while ((dscr & DSCR_ITE) == 0); /* Wait for InstrCompl bit to be set */
265 /* update dscr and el after each command execution */
267 if (dpm->last_el != ((dscr >> 8) & 3))
268 LOG_DEBUG("EL %i -> %i", dpm->last_el, (dscr >> 8) & 3);
269 dpm->last_el = (dscr >> 8) & 3;
271 if (dscr & DSCR_ERR) {
272 LOG_ERROR("Opcode 0x%08"PRIx32", DSCR.ERR=1, DSCR.EL=%i", opcode, dpm->last_el);
273 armv8_dpm_handle_exception(dpm);
283 static int dpmv8_instr_execute(struct arm_dpm *dpm, uint32_t opcode)
285 return dpmv8_exec_opcode(dpm, opcode, NULL);
288 static int dpmv8_instr_write_data_dcc(struct arm_dpm *dpm,
289 uint32_t opcode, uint32_t data)
291 struct armv8_common *armv8 = dpm->arm->arch_info;
294 retval = dpmv8_write_dcc(armv8, data);
295 if (retval != ERROR_OK)
298 return dpmv8_exec_opcode(dpm, opcode, 0);
301 static int dpmv8_instr_write_data_dcc_64(struct arm_dpm *dpm,
302 uint32_t opcode, uint64_t data)
304 struct armv8_common *armv8 = dpm->arm->arch_info;
307 retval = dpmv8_write_dcc_64(armv8, data);
308 if (retval != ERROR_OK)
311 return dpmv8_exec_opcode(dpm, opcode, 0);
314 static int dpmv8_instr_write_data_r0(struct arm_dpm *dpm,
315 uint32_t opcode, uint32_t data)
317 struct armv8_common *armv8 = dpm->arm->arch_info;
318 uint32_t dscr = DSCR_ITE;
321 retval = dpmv8_write_dcc(armv8, data);
322 if (retval != ERROR_OK)
325 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, READ_REG_DTRRX), &dscr);
326 if (retval != ERROR_OK)
329 /* then the opcode, taking data from R0 */
330 return dpmv8_exec_opcode(dpm, opcode, &dscr);
333 static int dpmv8_instr_write_data_r0_64(struct arm_dpm *dpm,
334 uint32_t opcode, uint64_t data)
336 struct armv8_common *armv8 = dpm->arm->arch_info;
337 uint32_t dscr = DSCR_ITE;
340 retval = dpmv8_write_dcc_64(armv8, data);
341 if (retval != ERROR_OK)
344 retval = dpmv8_exec_opcode(dpm, ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr);
345 if (retval != ERROR_OK)
348 /* then the opcode, taking data from R0 */
349 return dpmv8_exec_opcode(dpm, opcode, &dscr);
352 static int dpmv8_instr_cpsr_sync(struct arm_dpm *dpm)
355 struct armv8_common *armv8 = dpm->arm->arch_info;
357 /* "Prefetch flush" after modifying execution status in CPSR */
358 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, ARMV8_OPC_DSB_SY), &dpm->dscr);
359 if (retval == ERROR_OK)
360 dpmv8_exec_opcode(dpm, armv8_opcode(armv8, ARMV8_OPC_ISB_SY), &dpm->dscr);
364 static int dpmv8_instr_read_data_dcc(struct arm_dpm *dpm,
365 uint32_t opcode, uint32_t *data)
367 struct armv8_common *armv8 = dpm->arm->arch_info;
368 uint32_t dscr = DSCR_ITE;
371 /* the opcode, writing data to DCC */
372 retval = dpmv8_exec_opcode(dpm, opcode, &dscr);
373 if (retval != ERROR_OK)
376 return dpmv8_read_dcc(armv8, data, &dscr);
379 static int dpmv8_instr_read_data_dcc_64(struct arm_dpm *dpm,
380 uint32_t opcode, uint64_t *data)
382 struct armv8_common *armv8 = dpm->arm->arch_info;
383 uint32_t dscr = DSCR_ITE;
386 /* the opcode, writing data to DCC */
387 retval = dpmv8_exec_opcode(dpm, opcode, &dscr);
388 if (retval != ERROR_OK)
391 return dpmv8_read_dcc_64(armv8, data, &dscr);
394 static int dpmv8_instr_read_data_r0(struct arm_dpm *dpm,
395 uint32_t opcode, uint32_t *data)
397 struct armv8_common *armv8 = dpm->arm->arch_info;
398 uint32_t dscr = DSCR_ITE;
401 /* the opcode, writing data to R0 */
402 retval = dpmv8_exec_opcode(dpm, opcode, &dscr);
403 if (retval != ERROR_OK)
406 /* write R0 to DCC */
407 retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, WRITE_REG_DTRTX), &dscr);
408 if (retval != ERROR_OK)
411 return dpmv8_read_dcc(armv8, data, &dscr);
414 static int dpmv8_instr_read_data_r0_64(struct arm_dpm *dpm,
415 uint32_t opcode, uint64_t *data)
417 struct armv8_common *armv8 = dpm->arm->arch_info;
418 uint32_t dscr = DSCR_ITE;
421 /* the opcode, writing data to R0 */
422 retval = dpmv8_exec_opcode(dpm, opcode, &dscr);
423 if (retval != ERROR_OK)
426 /* write R0 to DCC */
427 retval = dpmv8_exec_opcode(dpm, ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr);
428 if (retval != ERROR_OK)
431 return dpmv8_read_dcc_64(armv8, data, &dscr);
435 static int dpmv8_bpwp_enable(struct arm_dpm *dpm, unsigned index_t,
436 target_addr_t addr, uint32_t control)
438 struct armv8_common *armv8 = dpm->arm->arch_info;
439 uint32_t vr = armv8->debug_base;
440 uint32_t cr = armv8->debug_base;
444 case 0 ... 15: /* breakpoints */
445 vr += CPUV8_DBG_BVR_BASE;
446 cr += CPUV8_DBG_BCR_BASE;
448 case 16 ... 31: /* watchpoints */
449 vr += CPUV8_DBG_WVR_BASE;
450 cr += CPUV8_DBG_WCR_BASE;
459 LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x",
460 (unsigned) vr, (unsigned) cr);
462 retval = mem_ap_write_atomic_u32(armv8->debug_ap, vr, addr);
463 if (retval != ERROR_OK)
465 return mem_ap_write_atomic_u32(armv8->debug_ap, cr, control);
469 static int dpmv8_bpwp_disable(struct arm_dpm *dpm, unsigned index_t)
471 struct armv8_common *armv8 = dpm->arm->arch_info;
476 cr = armv8->debug_base + CPUV8_DBG_BCR_BASE;
479 cr = armv8->debug_base + CPUV8_DBG_WCR_BASE;
487 LOG_DEBUG("A: bpwp disable, cr %08x", (unsigned) cr);
489 /* clear control register */
490 return mem_ap_write_atomic_u32(armv8->debug_ap, cr, 0);
494 * Coprocessor support
497 /* Read coprocessor */
498 static int dpmv8_mrc(struct target *target, int cpnum,
499 uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
502 struct arm *arm = target_to_arm(target);
503 struct arm_dpm *dpm = arm->dpm;
506 retval = dpm->prepare(dpm);
507 if (retval != ERROR_OK)
510 LOG_DEBUG("MRC p%d, %d, r0, c%d, c%d, %d", cpnum,
511 (int) op1, (int) CRn,
512 (int) CRm, (int) op2);
514 /* read coprocessor register into R0; return via DCC */
515 retval = dpm->instr_read_data_r0(dpm,
516 ARMV4_5_MRC(cpnum, op1, 0, CRn, CRm, op2),
519 /* (void) */ dpm->finish(dpm);
523 static int dpmv8_mcr(struct target *target, int cpnum,
524 uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
527 struct arm *arm = target_to_arm(target);
528 struct arm_dpm *dpm = arm->dpm;
531 retval = dpm->prepare(dpm);
532 if (retval != ERROR_OK)
535 LOG_DEBUG("MCR p%d, %d, r0, c%d, c%d, %d", cpnum,
536 (int) op1, (int) CRn,
537 (int) CRm, (int) op2);
539 /* read DCC into r0; then write coprocessor register from R0 */
540 retval = dpm->instr_write_data_r0(dpm,
541 ARMV4_5_MCR(cpnum, op1, 0, CRn, CRm, op2),
544 /* (void) */ dpm->finish(dpm);
548 static int dpmv8_mrs(struct target *target, uint32_t op0,
549 uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
552 struct arm *arm = target_to_arm(target);
553 struct arm_dpm *dpm = arm->dpm;
557 retval = dpm->prepare(dpm);
558 if (retval != ERROR_OK)
560 op_code = ((op0 & 0x3) << 19 | (op1 & 0x7) << 16 | (CRn & 0xF) << 12 |\
561 (CRm & 0xF) << 8 | (op2 & 0x7) << 5);
563 LOG_DEBUG("MRS p%d, %d, r0, c%d, c%d, %d", (int)op0,
564 (int) op1, (int) CRn,
565 (int) CRm, (int) op2);
566 /* read coprocessor register into R0; return via DCC */
567 retval = dpm->instr_read_data_r0(dpm,
568 ARMV8_MRS(op_code, 0),
571 /* (void) */ dpm->finish(dpm);
575 static int dpmv8_msr(struct target *target, uint32_t op0,
576 uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
579 struct arm *arm = target_to_arm(target);
580 struct arm_dpm *dpm = arm->dpm;
584 retval = dpm->prepare(dpm);
585 if (retval != ERROR_OK)
588 op_code = ((op0 & 0x3) << 19 | (op1 & 0x7) << 16 | (CRn & 0xF) << 12 |\
589 (CRm & 0xF) << 8 | (op2 & 0x7) << 5);
591 LOG_DEBUG("MSR p%d, %d, r0, c%d, c%d, %d", (int)op0,
592 (int) op1, (int) CRn,
593 (int) CRm, (int) op2);
595 /* read DCC into r0; then write coprocessor register from R0 */
596 retval = dpm->instr_write_data_r0(dpm,
597 ARMV8_MSR_GP(op_code, 0),
600 /* (void) */ dpm->finish(dpm);
604 /*----------------------------------------------------------------------*/
607 * Register access utilities
610 int armv8_dpm_modeswitch(struct arm_dpm *dpm, enum arm_mode mode)
612 struct armv8_common *armv8 = (struct armv8_common *)dpm->arm->arch_info;
613 int retval = ERROR_OK;
614 unsigned int target_el;
615 enum arm_state core_state;
618 /* restore previous mode */
619 if (mode == ARM_MODE_ANY) {
620 cpsr = buf_get_u32(dpm->arm->cpsr->value, 0, 32);
622 LOG_DEBUG("restoring mode, cpsr = 0x%08"PRIx32, cpsr);
625 LOG_DEBUG("setting mode 0x%"PRIx32, mode);
627 /* else force to the specified mode */
628 if (is_arm_mode(mode))
634 switch (cpsr & 0x1f) {
646 * TODO: handle ARM_MODE_HYP
656 target_el = (cpsr >> 2) & 3;
659 if (target_el > SYSTEM_CUREL_EL3) {
660 LOG_ERROR("%s: Invalid target exception level %i", __func__, target_el);
664 LOG_DEBUG("target_el = %i, last_el = %i", target_el, dpm->last_el);
665 if (target_el > dpm->last_el) {
666 retval = dpm->instr_execute(dpm,
667 armv8_opcode(armv8, ARMV8_OPC_DCPS) | target_el);
669 /* DCPS clobbers registers just like an exception taken */
670 armv8_dpm_handle_exception(dpm);
672 core_state = armv8_dpm_get_core_state(dpm);
673 if (core_state != ARM_STATE_AARCH64) {
674 /* cannot do DRPS/ERET when already in EL0 */
675 if (dpm->last_el != 0) {
676 /* load SPSR with the desired mode and execute DRPS */
677 LOG_DEBUG("SPSR = 0x%08"PRIx32, cpsr);
678 retval = dpm->instr_write_data_r0(dpm,
679 ARMV8_MSR_GP_xPSR_T1(1, 0, 15), cpsr);
680 if (retval == ERROR_OK)
681 retval = dpm->instr_execute(dpm, armv8_opcode(armv8, ARMV8_OPC_DRPS));
685 * need to execute multiple DRPS instructions until target_el
688 while (retval == ERROR_OK && dpm->last_el != target_el) {
689 unsigned int cur_el = dpm->last_el;
690 retval = dpm->instr_execute(dpm, armv8_opcode(armv8, ARMV8_OPC_DRPS));
691 if (cur_el == dpm->last_el) {
692 LOG_INFO("Cannot reach EL %i, SPSR corrupted?", target_el);
698 /* On executing DRPS, DSPSR and DLR become UNKNOWN, mark them as dirty */
699 dpm->arm->cpsr->dirty = true;
700 dpm->arm->pc->dirty = true;
703 * re-evaluate the core state, we might be in Aarch32 state now
704 * we rely on dpm->dscr being up-to-date
706 core_state = armv8_dpm_get_core_state(dpm);
707 armv8_select_opcodes(armv8, core_state == ARM_STATE_AARCH64);
708 armv8_select_reg_access(armv8, core_state == ARM_STATE_AARCH64);
715 * Common register read, relies on armv8_select_reg_access() having been called.
717 static int dpmv8_read_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
719 struct armv8_common *armv8 = dpm->arm->arch_info;
723 retval = armv8->read_reg_u64(armv8, regnum, &value_64);
725 if (retval == ERROR_OK) {
728 buf_set_u64(r->value, 0, r->size, value_64);
730 LOG_DEBUG("READ: %s, %16.8llx", r->name, (unsigned long long) value_64);
732 LOG_DEBUG("READ: %s, %8.8x", r->name, (unsigned int) value_64);
738 * Common register write, relies on armv8_select_reg_access() having been called.
740 static int dpmv8_write_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
742 struct armv8_common *armv8 = dpm->arm->arch_info;
743 int retval = ERROR_FAIL;
746 value_64 = buf_get_u64(r->value, 0, r->size);
748 retval = armv8->write_reg_u64(armv8, regnum, value_64);
749 if (retval == ERROR_OK) {
752 LOG_DEBUG("WRITE: %s, %16.8llx", r->name, (unsigned long long)value_64);
754 LOG_DEBUG("WRITE: %s, %8.8x", r->name, (unsigned int)value_64);
761 * Read basic registers of the the current context: R0 to R15, and CPSR;
762 * sets the core mode (such as USR or IRQ) and state (such as ARM or Thumb).
763 * In normal operation this is called on entry to halting debug state,
764 * possibly after some other operations supporting restore of debug state
765 * or making sure the CPU is fully idle (drain write buffer, etc).
767 int armv8_dpm_read_current_registers(struct arm_dpm *dpm)
769 struct arm *arm = dpm->arm;
770 struct armv8_common *armv8 = (struct armv8_common *)arm->arch_info;
771 struct reg_cache *cache;
776 retval = dpm->prepare(dpm);
777 if (retval != ERROR_OK)
780 cache = arm->core_cache;
782 /* read R0 first (it's used for scratch), then CPSR */
783 r = cache->reg_list + 0;
785 retval = dpmv8_read_reg(dpm, r, 0);
786 if (retval != ERROR_OK)
791 /* read cpsr to r0 and get it back */
792 retval = dpm->instr_read_data_r0(dpm,
793 armv8_opcode(armv8, READ_REG_DSPSR), &cpsr);
794 if (retval != ERROR_OK)
797 /* update core mode and state */
798 armv8_set_cpsr(arm, cpsr);
800 for (unsigned int i = 1; i < cache->num_regs ; i++) {
801 struct arm_reg *arm_reg;
803 r = armv8_reg_current(arm, i);
808 * Only read registers that are available from the
809 * current EL (or core mode).
811 arm_reg = r->arch_info;
812 if (arm_reg->mode != ARM_MODE_ANY &&
813 dpm->last_el != armv8_curel_from_core_mode(arm_reg->mode))
816 retval = dpmv8_read_reg(dpm, r, i);
817 if (retval != ERROR_OK)
827 /* Avoid needless I/O ... leave breakpoints and watchpoints alone
828 * unless they're removed, or need updating because of single-stepping
829 * or running debugger code.
831 static int dpmv8_maybe_update_bpwp(struct arm_dpm *dpm, bool bpwp,
832 struct dpm_bpwp *xp, int *set_p)
834 int retval = ERROR_OK;
841 /* removed or startup; we must disable it */
846 /* disabled, but we must set it */
847 xp->dirty = disable = false;
852 /* set, but we must temporarily disable it */
853 xp->dirty = disable = true;
858 retval = dpm->bpwp_disable(dpm, xp->number);
860 retval = dpm->bpwp_enable(dpm, xp->number,
861 xp->address, xp->control);
863 if (retval != ERROR_OK)
864 LOG_ERROR("%s: can't %s HW %spoint %d",
865 disable ? "disable" : "enable",
866 target_name(dpm->arm->target),
867 (xp->number < 16) ? "break" : "watch",
873 static int dpmv8_add_breakpoint(struct target *target, struct breakpoint *bp);
876 * Writes all modified core registers for all processor modes. In normal
877 * operation this is called on exit from halting debug state.
879 * @param dpm: represents the processor
880 * @param bpwp: true ensures breakpoints and watchpoints are set,
881 * false ensures they are cleared
883 int armv8_dpm_write_dirty_registers(struct arm_dpm *dpm, bool bpwp)
885 struct arm *arm = dpm->arm;
886 struct reg_cache *cache = arm->core_cache;
889 retval = dpm->prepare(dpm);
890 if (retval != ERROR_OK)
893 /* If we're managing hardware breakpoints for this core, enable
894 * or disable them as requested.
896 * REVISIT We don't yet manage them for ANY cores. Eventually
897 * we should be able to assume we handle them; but until then,
898 * cope with the hand-crafted breakpoint code.
900 if (arm->target->type->add_breakpoint == dpmv8_add_breakpoint) {
901 for (unsigned i = 0; i < dpm->nbp; i++) {
902 struct dpm_bp *dbp = dpm->dbp + i;
903 struct breakpoint *bp = dbp->bp;
905 retval = dpmv8_maybe_update_bpwp(dpm, bpwp, &dbp->bpwp,
906 bp ? &bp->set : NULL);
907 if (retval != ERROR_OK)
912 /* enable/disable watchpoints */
913 for (unsigned i = 0; i < dpm->nwp; i++) {
914 struct dpm_wp *dwp = dpm->dwp + i;
915 struct watchpoint *wp = dwp->wp;
917 retval = dpmv8_maybe_update_bpwp(dpm, bpwp, &dwp->bpwp,
918 wp ? &wp->set : NULL);
919 if (retval != ERROR_OK)
923 /* NOTE: writes to breakpoint and watchpoint registers might
924 * be queued, and need (efficient/batched) flushing later.
927 /* Restore original core mode and state */
928 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
929 if (retval != ERROR_OK)
932 /* check everything except our scratch register R0 */
933 for (unsigned i = 1; i < cache->num_regs; i++) {
936 /* skip PC and CPSR */
937 if (i == ARMV8_PC || i == ARMV8_xPSR)
940 if (!cache->reg_list[i].valid)
943 if (!cache->reg_list[i].dirty)
946 /* skip all registers not on the current EL */
947 r = cache->reg_list[i].arch_info;
948 if (r->mode != ARM_MODE_ANY &&
949 dpm->last_el != armv8_curel_from_core_mode(r->mode))
952 retval = dpmv8_write_reg(dpm, &cache->reg_list[i], i);
953 if (retval != ERROR_OK)
957 /* flush CPSR and PC */
958 if (retval == ERROR_OK)
959 retval = dpmv8_write_reg(dpm, &cache->reg_list[ARMV8_xPSR], ARMV8_xPSR);
960 if (retval == ERROR_OK)
961 retval = dpmv8_write_reg(dpm, &cache->reg_list[ARMV8_PC], ARMV8_PC);
962 /* flush R0 -- it's *very* dirty by now */
963 if (retval == ERROR_OK)
964 retval = dpmv8_write_reg(dpm, &cache->reg_list[0], 0);
965 if (retval == ERROR_OK)
966 dpm->instr_cpsr_sync(dpm);
973 * Standard ARM register accessors ... there are three methods
974 * in "struct arm", to support individual read/write and bulk read
978 static int armv8_dpm_read_core_reg(struct target *target, struct reg *r,
979 int regnum, enum arm_mode mode)
981 struct arm *arm = target_to_arm(target);
982 struct arm_dpm *dpm = target_to_arm(target)->dpm;
984 int max = arm->core_cache->num_regs;
986 if (regnum < 0 || regnum >= max)
987 return ERROR_COMMAND_SYNTAX_ERROR;
990 * REVISIT what happens if we try to read SPSR in a core mode
991 * which has no such register?
993 retval = dpm->prepare(dpm);
994 if (retval != ERROR_OK)
997 retval = dpmv8_read_reg(dpm, r, regnum);
998 if (retval != ERROR_OK)
1002 /* (void) */ dpm->finish(dpm);
1006 static int armv8_dpm_write_core_reg(struct target *target, struct reg *r,
1007 int regnum, enum arm_mode mode, uint8_t *value)
1009 struct arm *arm = target_to_arm(target);
1010 struct arm_dpm *dpm = target_to_arm(target)->dpm;
1012 int max = arm->core_cache->num_regs;
1014 if (regnum < 0 || regnum > max)
1015 return ERROR_COMMAND_SYNTAX_ERROR;
1017 /* REVISIT what happens if we try to write SPSR in a core mode
1018 * which has no such register?
1021 retval = dpm->prepare(dpm);
1022 if (retval != ERROR_OK)
1025 retval = dpmv8_write_reg(dpm, r, regnum);
1027 /* always clean up, regardless of error */
1033 static int armv8_dpm_full_context(struct target *target)
1035 struct arm *arm = target_to_arm(target);
1036 struct arm_dpm *dpm = arm->dpm;
1037 struct reg_cache *cache = arm->core_cache;
1041 retval = dpm->prepare(dpm);
1042 if (retval != ERROR_OK)
1046 enum arm_mode mode = ARM_MODE_ANY;
1050 /* We "know" arm_dpm_read_current_registers() was called so
1051 * the unmapped registers (R0..R7, PC, AND CPSR) and some
1052 * view of R8..R14 are current. We also "know" oddities of
1053 * register mapping: special cases for R8..R12 and SPSR.
1055 * Pick some mode with unread registers and read them all.
1056 * Repeat until done.
1058 for (unsigned i = 0; i < cache->num_regs; i++) {
1061 if (cache->reg_list[i].valid)
1063 r = cache->reg_list[i].arch_info;
1065 /* may need to pick a mode and set CPSR */
1070 /* For regular (ARM_MODE_ANY) R8..R12
1071 * in case we've entered debug state
1072 * in FIQ mode we need to patch mode.
1074 if (mode != ARM_MODE_ANY)
1075 retval = armv8_dpm_modeswitch(dpm, mode);
1077 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_USR);
1079 if (retval != ERROR_OK)
1082 if (r->mode != mode)
1085 /* CPSR was read, so "R16" must mean SPSR */
1086 retval = dpmv8_read_reg(dpm,
1087 &cache->reg_list[i],
1088 (r->num == 16) ? 17 : r->num);
1089 if (retval != ERROR_OK)
1095 retval = armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
1096 /* (void) */ dpm->finish(dpm);
1102 /*----------------------------------------------------------------------*/
1105 * Breakpoint and Watchpoint support.
1107 * Hardware {break,watch}points are usually left active, to minimize
1108 * debug entry/exit costs. When they are set or cleared, it's done in
1109 * batches. Also, DPM-conformant hardware can update debug registers
1110 * regardless of whether the CPU is running or halted ... though that
1111 * fact isn't currently leveraged.
1114 static int dpmv8_bpwp_setup(struct arm_dpm *dpm, struct dpm_bpwp *xp,
1115 uint32_t addr, uint32_t length)
1119 control = (1 << 0) /* enable */
1120 | (3 << 1); /* both user and privileged access */
1122 /* Match 1, 2, or all 4 byte addresses in this word.
1124 * FIXME: v7 hardware allows lengths up to 2 GB for BP and WP.
1125 * Support larger length, when addr is suitably aligned. In
1126 * particular, allow watchpoints on 8 byte "double" values.
1128 * REVISIT allow watchpoints on unaligned 2-bit values; and on
1129 * v7 hardware, unaligned 4-byte ones too.
1133 control |= (1 << (addr & 3)) << 5;
1136 /* require 2-byte alignment */
1138 control |= (3 << (addr & 2)) << 5;
1143 /* require 4-byte alignment */
1145 control |= 0xf << 5;
1150 LOG_ERROR("unsupported {break,watch}point length/alignment");
1151 return ERROR_COMMAND_SYNTAX_ERROR;
1154 /* other shared control bits:
1155 * bits 15:14 == 0 ... both secure and nonsecure states (v6.1+ only)
1156 * bit 20 == 0 ... not linked to a context ID
1157 * bit 28:24 == 0 ... not ignoring N LSBs (v7 only)
1160 xp->address = addr & ~3;
1161 xp->control = control;
1164 LOG_DEBUG("BPWP: addr %8.8" PRIx32 ", control %" PRIx32 ", number %d",
1165 xp->address, control, xp->number);
1167 /* hardware is updated in write_dirty_registers() */
1171 static int dpmv8_add_breakpoint(struct target *target, struct breakpoint *bp)
1173 struct arm *arm = target_to_arm(target);
1174 struct arm_dpm *dpm = arm->dpm;
1175 int retval = ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1178 return ERROR_COMMAND_SYNTAX_ERROR;
1179 if (!dpm->bpwp_enable)
1182 /* FIXME we need a generic solution for software breakpoints. */
1183 if (bp->type == BKPT_SOFT)
1184 LOG_DEBUG("using HW bkpt, not SW...");
1186 for (unsigned i = 0; i < dpm->nbp; i++) {
1187 if (!dpm->dbp[i].bp) {
1188 retval = dpmv8_bpwp_setup(dpm, &dpm->dbp[i].bpwp,
1189 bp->address, bp->length);
1190 if (retval == ERROR_OK)
1191 dpm->dbp[i].bp = bp;
1199 static int dpmv8_remove_breakpoint(struct target *target, struct breakpoint *bp)
1201 struct arm *arm = target_to_arm(target);
1202 struct arm_dpm *dpm = arm->dpm;
1203 int retval = ERROR_COMMAND_SYNTAX_ERROR;
1205 for (unsigned i = 0; i < dpm->nbp; i++) {
1206 if (dpm->dbp[i].bp == bp) {
1207 dpm->dbp[i].bp = NULL;
1208 dpm->dbp[i].bpwp.dirty = true;
1210 /* hardware is updated in write_dirty_registers() */
1219 static int dpmv8_watchpoint_setup(struct arm_dpm *dpm, unsigned index_t,
1220 struct watchpoint *wp)
1223 struct dpm_wp *dwp = dpm->dwp + index_t;
1226 /* this hardware doesn't support data value matching or masking */
1227 if (wp->value || wp->mask != ~(uint32_t)0) {
1228 LOG_DEBUG("watchpoint values and masking not supported");
1229 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1232 retval = dpmv8_bpwp_setup(dpm, &dwp->bpwp, wp->address, wp->length);
1233 if (retval != ERROR_OK)
1236 control = dwp->bpwp.control;
1248 dwp->bpwp.control = control;
1250 dpm->dwp[index_t].wp = wp;
1255 static int dpmv8_add_watchpoint(struct target *target, struct watchpoint *wp)
1257 struct arm *arm = target_to_arm(target);
1258 struct arm_dpm *dpm = arm->dpm;
1259 int retval = ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1261 if (dpm->bpwp_enable) {
1262 for (unsigned i = 0; i < dpm->nwp; i++) {
1263 if (!dpm->dwp[i].wp) {
1264 retval = dpmv8_watchpoint_setup(dpm, i, wp);
1273 static int dpmv8_remove_watchpoint(struct target *target, struct watchpoint *wp)
1275 struct arm *arm = target_to_arm(target);
1276 struct arm_dpm *dpm = arm->dpm;
1277 int retval = ERROR_COMMAND_SYNTAX_ERROR;
1279 for (unsigned i = 0; i < dpm->nwp; i++) {
1280 if (dpm->dwp[i].wp == wp) {
1281 dpm->dwp[i].wp = NULL;
1282 dpm->dwp[i].bpwp.dirty = true;
1284 /* hardware is updated in write_dirty_registers() */
1293 void armv8_dpm_report_wfar(struct arm_dpm *dpm, uint64_t addr)
1295 switch (dpm->arm->core_state) {
1297 case ARM_STATE_AARCH64:
1300 case ARM_STATE_THUMB:
1301 case ARM_STATE_THUMB_EE:
1304 case ARM_STATE_JAZELLE:
1308 LOG_DEBUG("Unknow core_state");
1315 * Handle exceptions taken in debug state. This happens mostly for memory
1316 * accesses that violated a MMU policy. Taking an exception while in debug
1317 * state clobbers certain state registers on the target exception level.
1318 * Just mark those registers dirty so that they get restored on resume.
1319 * This works both for Aarch32 and Aarch64 states.
1321 * This function must not perform any actions that trigger another exception
1322 * or a recursion will happen.
1324 void armv8_dpm_handle_exception(struct arm_dpm *dpm)
1326 struct armv8_common *armv8 = dpm->arm->arch_info;
1327 struct reg_cache *cache = dpm->arm->core_cache;
1328 enum arm_state core_state;
1333 static const int clobbered_regs_by_el[3][5] = {
1334 { ARMV8_PC, ARMV8_xPSR, ARMV8_ELR_EL1, ARMV8_ESR_EL1, ARMV8_SPSR_EL1 },
1335 { ARMV8_PC, ARMV8_xPSR, ARMV8_ELR_EL2, ARMV8_ESR_EL2, ARMV8_SPSR_EL2 },
1336 { ARMV8_PC, ARMV8_xPSR, ARMV8_ELR_EL3, ARMV8_ESR_EL3, ARMV8_SPSR_EL3 },
1339 el = (dpm->dscr >> 8) & 3;
1341 /* safety check, must not happen since EL0 cannot be a target for an exception */
1342 if (el < SYSTEM_CUREL_EL1 || el > SYSTEM_CUREL_EL3) {
1343 LOG_ERROR("%s: EL %i is invalid, DSCR corrupted?", __func__, el);
1347 /* Clear sticky error */
1348 mem_ap_write_u32(armv8->debug_ap,
1349 armv8->debug_base + CPUV8_DBG_DRCR, DRCR_CSE);
1351 armv8->read_reg_u64(armv8, ARMV8_xPSR, &dlr);
1353 armv8->read_reg_u64(armv8, ARMV8_PC, &dlr);
1355 LOG_DEBUG("Exception taken to EL %i, DLR=0x%016"PRIx64" DSPSR=0x%08"PRIx32,
1358 /* mark all clobbered registers as dirty */
1359 for (int i = 0; i < 5; i++)
1360 cache->reg_list[clobbered_regs_by_el[el-1][i]].dirty = true;
1363 * re-evaluate the core state, we might be in Aarch64 state now
1364 * we rely on dpm->dscr being up-to-date
1366 core_state = armv8_dpm_get_core_state(dpm);
1367 armv8_select_opcodes(armv8, core_state == ARM_STATE_AARCH64);
1368 armv8_select_reg_access(armv8, core_state == ARM_STATE_AARCH64);
1371 /*----------------------------------------------------------------------*/
1374 * Other debug and support utilities
1377 void armv8_dpm_report_dscr(struct arm_dpm *dpm, uint32_t dscr)
1379 struct target *target = dpm->arm->target;
1382 dpm->last_el = (dscr >> 8) & 3;
1384 /* Examine debug reason */
1385 switch (DSCR_ENTRY(dscr)) {
1386 /* FALL THROUGH -- assume a v6 core in abort mode */
1387 case DSCRV8_ENTRY_EXT_DEBUG: /* EDBGRQ */
1388 target->debug_reason = DBG_REASON_DBGRQ;
1390 case DSCRV8_ENTRY_HALT_STEP_EXECLU: /* HALT step */
1391 case DSCRV8_ENTRY_HALT_STEP_NORMAL: /* Halt step*/
1392 case DSCRV8_ENTRY_HALT_STEP:
1393 target->debug_reason = DBG_REASON_SINGLESTEP;
1395 case DSCRV8_ENTRY_HLT: /* HLT instruction (software breakpoint) */
1396 case DSCRV8_ENTRY_BKPT: /* SW BKPT (?) */
1397 case DSCRV8_ENTRY_RESET_CATCH: /* Reset catch */
1398 case DSCRV8_ENTRY_OS_UNLOCK: /*OS unlock catch*/
1399 case DSCRV8_ENTRY_EXCEPTION_CATCH: /*exception catch*/
1400 case DSCRV8_ENTRY_SW_ACCESS_DBG: /*SW access dbg register*/
1401 target->debug_reason = DBG_REASON_BREAKPOINT;
1403 case DSCRV8_ENTRY_WATCHPOINT: /* asynch watchpoint */
1404 target->debug_reason = DBG_REASON_WATCHPOINT;
1407 target->debug_reason = DBG_REASON_UNDEFINED;
1413 /*----------------------------------------------------------------------*/
1416 * Setup and management support.
1420 * Hooks up this DPM to its associated target; call only once.
1421 * Initially this only covers the register cache.
1423 * Oh, and watchpoints. Yeah.
1425 int armv8_dpm_setup(struct arm_dpm *dpm)
1427 struct arm *arm = dpm->arm;
1428 struct target *target = arm->target;
1429 struct reg_cache *cache;
1432 /* register access setup */
1433 arm->full_context = armv8_dpm_full_context;
1434 arm->read_core_reg = armv8_dpm_read_core_reg;
1435 arm->write_core_reg = armv8_dpm_write_core_reg;
1437 if (arm->core_cache == NULL) {
1438 cache = armv8_build_reg_cache(target);
1443 /* coprocessor access setup */
1444 arm->mrc = dpmv8_mrc;
1445 arm->mcr = dpmv8_mcr;
1446 arm->mrs = dpmv8_mrs;
1447 arm->msr = dpmv8_msr;
1449 dpm->prepare = dpmv8_dpm_prepare;
1450 dpm->finish = dpmv8_dpm_finish;
1452 dpm->instr_execute = dpmv8_instr_execute;
1453 dpm->instr_write_data_dcc = dpmv8_instr_write_data_dcc;
1454 dpm->instr_write_data_dcc_64 = dpmv8_instr_write_data_dcc_64;
1455 dpm->instr_write_data_r0 = dpmv8_instr_write_data_r0;
1456 dpm->instr_write_data_r0_64 = dpmv8_instr_write_data_r0_64;
1457 dpm->instr_cpsr_sync = dpmv8_instr_cpsr_sync;
1459 dpm->instr_read_data_dcc = dpmv8_instr_read_data_dcc;
1460 dpm->instr_read_data_dcc_64 = dpmv8_instr_read_data_dcc_64;
1461 dpm->instr_read_data_r0 = dpmv8_instr_read_data_r0;
1462 dpm->instr_read_data_r0_64 = dpmv8_instr_read_data_r0_64;
1464 dpm->arm_reg_current = armv8_reg_current;
1466 /* dpm->bpwp_enable = dpmv8_bpwp_enable; */
1467 dpm->bpwp_disable = dpmv8_bpwp_disable;
1469 /* breakpoint setup -- optional until it works everywhere */
1470 if (!target->type->add_breakpoint) {
1471 target->type->add_breakpoint = dpmv8_add_breakpoint;
1472 target->type->remove_breakpoint = dpmv8_remove_breakpoint;
1475 /* watchpoint setup */
1476 target->type->add_watchpoint = dpmv8_add_watchpoint;
1477 target->type->remove_watchpoint = dpmv8_remove_watchpoint;
1479 /* FIXME add vector catch support */
1481 dpm->nbp = 1 + ((dpm->didr >> 12) & 0xf);
1482 dpm->dbp = calloc(dpm->nbp, sizeof *dpm->dbp);
1484 dpm->nwp = 1 + ((dpm->didr >> 20) & 0xf);
1485 dpm->dwp = calloc(dpm->nwp, sizeof *dpm->dwp);
1487 if (!dpm->dbp || !dpm->dwp) {
1493 LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
1494 target_name(target), dpm->nbp, dpm->nwp);
1496 /* REVISIT ... and some of those breakpoints could match
1497 * execution context IDs...
1504 * Reinitializes DPM state at the beginning of a new debug session
1505 * or after a reset which may have affected the debug module.
1507 int armv8_dpm_initialize(struct arm_dpm *dpm)
1509 /* Disable all breakpoints and watchpoints at startup. */
1510 if (dpm->bpwp_disable) {
1513 for (i = 0; i < dpm->nbp; i++) {
1514 dpm->dbp[i].bpwp.number = i;
1515 (void) dpm->bpwp_disable(dpm, i);
1517 for (i = 0; i < dpm->nwp; i++) {
1518 dpm->dwp[i].bpwp.number = 16 + i;
1519 (void) dpm->bpwp_disable(dpm, 16 + i);
1522 LOG_WARNING("%s: can't disable breakpoints and watchpoints",
1523 target_name(dpm->arm->target));