1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * Copyright (C) 2006 by Magnus Lundin *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
25 * Cortex-M3(tm) TRM, ARM DDI 0337E (r1p1) and 0337G (r2p0) *
27 ***************************************************************************/
32 #include "jtag/interface.h"
33 #include "breakpoints.h"
35 #include "target_request.h"
36 #include "target_type.h"
37 #include "arm_disassembler.h"
39 #include "arm_opcodes.h"
40 #include "arm_semihosting.h"
41 #include <helper/time_support.h>
43 /* NOTE: most of this should work fine for the Cortex-M1 and
44 * Cortex-M0 cores too, although they're ARMv6-M not ARMv7-M.
45 * Some differences: M0/M1 doesn't have FBP remapping or the
46 * DWT tracing/profiling support. (So the cycle counter will
47 * not be usable; the other stuff isn't currently used here.)
49 * Although there are some workarounds for errata seen only in r0p0
50 * silicon, such old parts are hard to find and thus not much tested
55 * Returns the type of a break point required by address location
57 #define BKPT_TYPE_BY_ADDR(addr) ((addr) < 0x20000000 ? BKPT_HARD : BKPT_SOFT)
59 /* forward declarations */
60 static int cortex_m_store_core_reg_u32(struct target *target,
61 uint32_t num, uint32_t value);
62 static void cortex_m_dwt_free(struct target *target);
64 static int cortexm_dap_read_coreregister_u32(struct target *target,
65 uint32_t *value, int regnum)
67 struct armv7m_common *armv7m = target_to_armv7m(target);
71 /* because the DCB_DCRDR is used for the emulated dcc channel
72 * we have to save/restore the DCB_DCRDR when used */
73 if (target->dbg_msg_enabled) {
74 retval = mem_ap_read_u32(armv7m->debug_ap, DCB_DCRDR, &dcrdr);
75 if (retval != ERROR_OK)
79 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRSR, regnum);
80 if (retval != ERROR_OK)
83 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DCRDR, value);
84 if (retval != ERROR_OK)
87 if (target->dbg_msg_enabled) {
88 /* restore DCB_DCRDR - this needs to be in a separate
89 * transaction otherwise the emulated DCC channel breaks */
90 if (retval == ERROR_OK)
91 retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRDR, dcrdr);
97 static int cortexm_dap_write_coreregister_u32(struct target *target,
98 uint32_t value, int regnum)
100 struct armv7m_common *armv7m = target_to_armv7m(target);
104 /* because the DCB_DCRDR is used for the emulated dcc channel
105 * we have to save/restore the DCB_DCRDR when used */
106 if (target->dbg_msg_enabled) {
107 retval = mem_ap_read_u32(armv7m->debug_ap, DCB_DCRDR, &dcrdr);
108 if (retval != ERROR_OK)
112 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, value);
113 if (retval != ERROR_OK)
116 retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRSR, regnum | DCRSR_WnR);
117 if (retval != ERROR_OK)
120 if (target->dbg_msg_enabled) {
121 /* restore DCB_DCRDR - this needs to be in a seperate
122 * transaction otherwise the emulated DCC channel breaks */
123 if (retval == ERROR_OK)
124 retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRDR, dcrdr);
130 static int cortex_m_write_debug_halt_mask(struct target *target,
131 uint32_t mask_on, uint32_t mask_off)
133 struct cortex_m_common *cortex_m = target_to_cm(target);
134 struct armv7m_common *armv7m = &cortex_m->armv7m;
136 /* mask off status bits */
137 cortex_m->dcb_dhcsr &= ~((0xFFFF << 16) | mask_off);
138 /* create new register mask */
139 cortex_m->dcb_dhcsr |= DBGKEY | C_DEBUGEN | mask_on;
141 return mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DHCSR, cortex_m->dcb_dhcsr);
144 static int cortex_m_clear_halt(struct target *target)
146 struct cortex_m_common *cortex_m = target_to_cm(target);
147 struct armv7m_common *armv7m = &cortex_m->armv7m;
150 /* clear step if any */
151 cortex_m_write_debug_halt_mask(target, C_HALT, C_STEP);
153 /* Read Debug Fault Status Register */
154 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_DFSR, &cortex_m->nvic_dfsr);
155 if (retval != ERROR_OK)
158 /* Clear Debug Fault Status */
159 retval = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_DFSR, cortex_m->nvic_dfsr);
160 if (retval != ERROR_OK)
162 LOG_DEBUG(" NVIC_DFSR 0x%" PRIx32 "", cortex_m->nvic_dfsr);
167 static int cortex_m_single_step_core(struct target *target)
169 struct cortex_m_common *cortex_m = target_to_cm(target);
170 struct armv7m_common *armv7m = &cortex_m->armv7m;
174 /* backup dhcsr reg */
175 dhcsr_save = cortex_m->dcb_dhcsr;
177 /* Mask interrupts before clearing halt, if done already. This avoids
178 * Erratum 377497 (fixed in r1p0) where setting MASKINTS while clearing
179 * HALT can put the core into an unknown state.
181 if (!(cortex_m->dcb_dhcsr & C_MASKINTS)) {
182 retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DHCSR,
183 DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN);
184 if (retval != ERROR_OK)
187 retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DHCSR,
188 DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN);
189 if (retval != ERROR_OK)
193 /* restore dhcsr reg */
194 cortex_m->dcb_dhcsr = dhcsr_save;
195 cortex_m_clear_halt(target);
200 static int cortex_m_enable_fpb(struct target *target)
202 int retval = target_write_u32(target, FP_CTRL, 3);
203 if (retval != ERROR_OK)
206 /* check the fpb is actually enabled */
208 retval = target_read_u32(target, FP_CTRL, &fpctrl);
209 if (retval != ERROR_OK)
218 static int cortex_m_endreset_event(struct target *target)
223 struct cortex_m_common *cortex_m = target_to_cm(target);
224 struct armv7m_common *armv7m = &cortex_m->armv7m;
225 struct adiv5_dap *swjdp = cortex_m->armv7m.arm.dap;
226 struct cortex_m_fp_comparator *fp_list = cortex_m->fp_comparator_list;
227 struct cortex_m_dwt_comparator *dwt_list = cortex_m->dwt_comparator_list;
229 /* REVISIT The four debug monitor bits are currently ignored... */
230 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &dcb_demcr);
231 if (retval != ERROR_OK)
233 LOG_DEBUG("DCB_DEMCR = 0x%8.8" PRIx32 "", dcb_demcr);
235 /* this register is used for emulated dcc channel */
236 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, 0);
237 if (retval != ERROR_OK)
240 /* Enable debug requests */
241 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
242 if (retval != ERROR_OK)
244 if (!(cortex_m->dcb_dhcsr & C_DEBUGEN)) {
245 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DHCSR, DBGKEY | C_DEBUGEN);
246 if (retval != ERROR_OK)
250 /* clear any interrupt masking */
251 cortex_m_write_debug_halt_mask(target, 0, C_MASKINTS);
253 /* Enable features controlled by ITM and DWT blocks, and catch only
254 * the vectors we were told to pay attention to.
256 * Target firmware is responsible for all fault handling policy
257 * choices *EXCEPT* explicitly scripted overrides like "vector_catch"
258 * or manual updates to the NVIC SHCSR and CCR registers.
260 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR, TRCENA | armv7m->demcr);
261 if (retval != ERROR_OK)
264 /* Paranoia: evidently some (early?) chips don't preserve all the
265 * debug state (including FBP, DWT, etc) across reset...
269 retval = cortex_m_enable_fpb(target);
270 if (retval != ERROR_OK) {
271 LOG_ERROR("Failed to enable the FPB");
275 cortex_m->fpb_enabled = 1;
277 /* Restore FPB registers */
278 for (i = 0; i < cortex_m->fp_num_code + cortex_m->fp_num_lit; i++) {
279 retval = target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
280 if (retval != ERROR_OK)
284 /* Restore DWT registers */
285 for (i = 0; i < cortex_m->dwt_num_comp; i++) {
286 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 0,
288 if (retval != ERROR_OK)
290 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 4,
292 if (retval != ERROR_OK)
294 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 8,
295 dwt_list[i].function);
296 if (retval != ERROR_OK)
299 retval = dap_run(swjdp);
300 if (retval != ERROR_OK)
303 register_cache_invalidate(armv7m->arm.core_cache);
305 /* make sure we have latest dhcsr flags */
306 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
311 static int cortex_m_examine_debug_reason(struct target *target)
313 struct cortex_m_common *cortex_m = target_to_cm(target);
315 /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason
316 * only check the debug reason if we don't know it already */
318 if ((target->debug_reason != DBG_REASON_DBGRQ)
319 && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
320 if (cortex_m->nvic_dfsr & DFSR_BKPT) {
321 target->debug_reason = DBG_REASON_BREAKPOINT;
322 if (cortex_m->nvic_dfsr & DFSR_DWTTRAP)
323 target->debug_reason = DBG_REASON_WPTANDBKPT;
324 } else if (cortex_m->nvic_dfsr & DFSR_DWTTRAP)
325 target->debug_reason = DBG_REASON_WATCHPOINT;
326 else if (cortex_m->nvic_dfsr & DFSR_VCATCH)
327 target->debug_reason = DBG_REASON_BREAKPOINT;
328 else /* EXTERNAL, HALTED */
329 target->debug_reason = DBG_REASON_UNDEFINED;
335 static int cortex_m_examine_exception_reason(struct target *target)
337 uint32_t shcsr = 0, except_sr = 0, cfsr = -1, except_ar = -1;
338 struct armv7m_common *armv7m = target_to_armv7m(target);
339 struct adiv5_dap *swjdp = armv7m->arm.dap;
342 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_SHCSR, &shcsr);
343 if (retval != ERROR_OK)
345 switch (armv7m->exception_number) {
348 case 3: /* Hard Fault */
349 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_HFSR, &except_sr);
350 if (retval != ERROR_OK)
352 if (except_sr & 0x40000000) {
353 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &cfsr);
354 if (retval != ERROR_OK)
358 case 4: /* Memory Management */
359 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
360 if (retval != ERROR_OK)
362 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_MMFAR, &except_ar);
363 if (retval != ERROR_OK)
366 case 5: /* Bus Fault */
367 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
368 if (retval != ERROR_OK)
370 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_BFAR, &except_ar);
371 if (retval != ERROR_OK)
374 case 6: /* Usage Fault */
375 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
376 if (retval != ERROR_OK)
379 case 11: /* SVCall */
381 case 12: /* Debug Monitor */
382 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_DFSR, &except_sr);
383 if (retval != ERROR_OK)
386 case 14: /* PendSV */
388 case 15: /* SysTick */
394 retval = dap_run(swjdp);
395 if (retval == ERROR_OK)
396 LOG_DEBUG("%s SHCSR 0x%" PRIx32 ", SR 0x%" PRIx32
397 ", CFSR 0x%" PRIx32 ", AR 0x%" PRIx32,
398 armv7m_exception_string(armv7m->exception_number),
399 shcsr, except_sr, cfsr, except_ar);
403 static int cortex_m_debug_entry(struct target *target)
408 struct cortex_m_common *cortex_m = target_to_cm(target);
409 struct armv7m_common *armv7m = &cortex_m->armv7m;
410 struct arm *arm = &armv7m->arm;
415 cortex_m_clear_halt(target);
416 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
417 if (retval != ERROR_OK)
420 retval = armv7m->examine_debug_reason(target);
421 if (retval != ERROR_OK)
424 /* Examine target state and mode
425 * First load register accessible through core debug port */
426 int num_regs = arm->core_cache->num_regs;
428 for (i = 0; i < num_regs; i++) {
429 r = &armv7m->arm.core_cache->reg_list[i];
431 arm->read_core_reg(target, r, i, ARM_MODE_ANY);
435 xPSR = buf_get_u32(r->value, 0, 32);
437 /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
440 cortex_m_store_core_reg_u32(target, 16, xPSR & ~0xff);
443 /* Are we in an exception handler */
445 armv7m->exception_number = (xPSR & 0x1FF);
447 arm->core_mode = ARM_MODE_HANDLER;
448 arm->map = armv7m_msp_reg_map;
450 unsigned control = buf_get_u32(arm->core_cache
451 ->reg_list[ARMV7M_CONTROL].value, 0, 2);
453 /* is this thread privileged? */
454 arm->core_mode = control & 1
455 ? ARM_MODE_USER_THREAD
458 /* which stack is it using? */
460 arm->map = armv7m_psp_reg_map;
462 arm->map = armv7m_msp_reg_map;
464 armv7m->exception_number = 0;
467 if (armv7m->exception_number)
468 cortex_m_examine_exception_reason(target);
470 LOG_DEBUG("entered debug state in core mode: %s at PC 0x%" PRIx32 ", target->state: %s",
471 arm_mode_name(arm->core_mode),
472 buf_get_u32(arm->pc->value, 0, 32),
473 target_state_name(target));
475 if (armv7m->post_debug_entry) {
476 retval = armv7m->post_debug_entry(target);
477 if (retval != ERROR_OK)
484 static int cortex_m_poll(struct target *target)
486 int detected_failure = ERROR_OK;
487 int retval = ERROR_OK;
488 enum target_state prev_target_state = target->state;
489 struct cortex_m_common *cortex_m = target_to_cm(target);
490 struct armv7m_common *armv7m = &cortex_m->armv7m;
492 /* Read from Debug Halting Control and Status Register */
493 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
494 if (retval != ERROR_OK) {
495 target->state = TARGET_UNKNOWN;
499 /* Recover from lockup. See ARMv7-M architecture spec,
500 * section B1.5.15 "Unrecoverable exception cases".
502 if (cortex_m->dcb_dhcsr & S_LOCKUP) {
503 LOG_ERROR("%s -- clearing lockup after double fault",
504 target_name(target));
505 cortex_m_write_debug_halt_mask(target, C_HALT, 0);
506 target->debug_reason = DBG_REASON_DBGRQ;
508 /* We have to execute the rest (the "finally" equivalent, but
509 * still throw this exception again).
511 detected_failure = ERROR_FAIL;
513 /* refresh status bits */
514 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
515 if (retval != ERROR_OK)
519 if (cortex_m->dcb_dhcsr & S_RESET_ST) {
520 target->state = TARGET_RESET;
524 if (target->state == TARGET_RESET) {
525 /* Cannot switch context while running so endreset is
526 * called with target->state == TARGET_RESET
528 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%" PRIx32,
529 cortex_m->dcb_dhcsr);
530 retval = cortex_m_endreset_event(target);
531 if (retval != ERROR_OK) {
532 target->state = TARGET_UNKNOWN;
535 target->state = TARGET_RUNNING;
536 prev_target_state = TARGET_RUNNING;
539 if (cortex_m->dcb_dhcsr & S_HALT) {
540 target->state = TARGET_HALTED;
542 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET)) {
543 retval = cortex_m_debug_entry(target);
544 if (retval != ERROR_OK)
547 if (arm_semihosting(target, &retval) != 0)
550 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
552 if (prev_target_state == TARGET_DEBUG_RUNNING) {
554 retval = cortex_m_debug_entry(target);
555 if (retval != ERROR_OK)
558 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
562 /* REVISIT when S_SLEEP is set, it's in a Sleep or DeepSleep state.
563 * How best to model low power modes?
566 if (target->state == TARGET_UNKNOWN) {
567 /* check if processor is retiring instructions */
568 if (cortex_m->dcb_dhcsr & S_RETIRE_ST) {
569 target->state = TARGET_RUNNING;
574 /* Did we detect a failure condition that we cleared? */
575 if (detected_failure != ERROR_OK)
576 retval = detected_failure;
580 static int cortex_m_halt(struct target *target)
582 LOG_DEBUG("target->state: %s",
583 target_state_name(target));
585 if (target->state == TARGET_HALTED) {
586 LOG_DEBUG("target was already halted");
590 if (target->state == TARGET_UNKNOWN)
591 LOG_WARNING("target was in unknown state when halt was requested");
593 if (target->state == TARGET_RESET) {
594 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst()) {
595 LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
596 return ERROR_TARGET_FAILURE;
598 /* we came here in a reset_halt or reset_init sequence
599 * debug entry was already prepared in cortex_m3_assert_reset()
601 target->debug_reason = DBG_REASON_DBGRQ;
607 /* Write to Debug Halting Control and Status Register */
608 cortex_m_write_debug_halt_mask(target, C_HALT, 0);
610 target->debug_reason = DBG_REASON_DBGRQ;
615 static int cortex_m_soft_reset_halt(struct target *target)
617 struct cortex_m_common *cortex_m = target_to_cm(target);
618 struct armv7m_common *armv7m = &cortex_m->armv7m;
619 uint32_t dcb_dhcsr = 0;
620 int retval, timeout = 0;
622 /* soft_reset_halt is deprecated on cortex_m as the same functionality
623 * can be obtained by using 'reset halt' and 'cortex_m reset_config vectreset'
624 * As this reset only used VC_CORERESET it would only ever reset the cortex_m
625 * core, not the peripherals */
626 LOG_WARNING("soft_reset_halt is deprecated, please use 'reset halt' instead.");
628 /* Enter debug state on reset; restore DEMCR in endreset_event() */
629 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR,
630 TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
631 if (retval != ERROR_OK)
634 /* Request a core-only reset */
635 retval = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_AIRCR,
636 AIRCR_VECTKEY | AIRCR_VECTRESET);
637 if (retval != ERROR_OK)
639 target->state = TARGET_RESET;
641 /* registers are now invalid */
642 register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
644 while (timeout < 100) {
645 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &dcb_dhcsr);
646 if (retval == ERROR_OK) {
647 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_DFSR,
648 &cortex_m->nvic_dfsr);
649 if (retval != ERROR_OK)
651 if ((dcb_dhcsr & S_HALT)
652 && (cortex_m->nvic_dfsr & DFSR_VCATCH)) {
653 LOG_DEBUG("system reset-halted, DHCSR 0x%08x, "
655 (unsigned) dcb_dhcsr,
656 (unsigned) cortex_m->nvic_dfsr);
657 cortex_m_poll(target);
658 /* FIXME restore user's vector catch config */
661 LOG_DEBUG("waiting for system reset-halt, "
662 "DHCSR 0x%08x, %d ms",
663 (unsigned) dcb_dhcsr, timeout);
672 void cortex_m_enable_breakpoints(struct target *target)
674 struct breakpoint *breakpoint = target->breakpoints;
676 /* set any pending breakpoints */
678 if (!breakpoint->set)
679 cortex_m_set_breakpoint(target, breakpoint);
680 breakpoint = breakpoint->next;
684 static int cortex_m_resume(struct target *target, int current,
685 uint32_t address, int handle_breakpoints, int debug_execution)
687 struct armv7m_common *armv7m = target_to_armv7m(target);
688 struct breakpoint *breakpoint = NULL;
692 if (target->state != TARGET_HALTED) {
693 LOG_WARNING("target not halted");
694 return ERROR_TARGET_NOT_HALTED;
697 if (!debug_execution) {
698 target_free_all_working_areas(target);
699 cortex_m_enable_breakpoints(target);
700 cortex_m_enable_watchpoints(target);
703 if (debug_execution) {
704 r = armv7m->arm.core_cache->reg_list + ARMV7M_PRIMASK;
706 /* Disable interrupts */
707 /* We disable interrupts in the PRIMASK register instead of
708 * masking with C_MASKINTS. This is probably the same issue
709 * as Cortex-M3 Erratum 377493 (fixed in r1p0): C_MASKINTS
710 * in parallel with disabled interrupts can cause local faults
713 * REVISIT this clearly breaks non-debug execution, since the
714 * PRIMASK register state isn't saved/restored... workaround
715 * by never resuming app code after debug execution.
717 buf_set_u32(r->value, 0, 1, 1);
721 /* Make sure we are in Thumb mode */
722 r = armv7m->arm.cpsr;
723 buf_set_u32(r->value, 24, 1, 1);
728 /* current = 1: continue on current pc, otherwise continue at <address> */
731 buf_set_u32(r->value, 0, 32, address);
736 /* if we halted last time due to a bkpt instruction
737 * then we have to manually step over it, otherwise
738 * the core will break again */
740 if (!breakpoint_find(target, buf_get_u32(r->value, 0, 32))
742 armv7m_maybe_skip_bkpt_inst(target, NULL);
744 resume_pc = buf_get_u32(r->value, 0, 32);
746 armv7m_restore_context(target);
748 /* the front-end may request us not to handle breakpoints */
749 if (handle_breakpoints) {
750 /* Single step past breakpoint at current address */
751 breakpoint = breakpoint_find(target, resume_pc);
753 LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 " (ID: %" PRIu32 ")",
755 breakpoint->unique_id);
756 cortex_m_unset_breakpoint(target, breakpoint);
757 cortex_m_single_step_core(target);
758 cortex_m_set_breakpoint(target, breakpoint);
763 cortex_m_write_debug_halt_mask(target, 0, C_HALT);
765 target->debug_reason = DBG_REASON_NOTHALTED;
767 /* registers are now invalid */
768 register_cache_invalidate(armv7m->arm.core_cache);
770 if (!debug_execution) {
771 target->state = TARGET_RUNNING;
772 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
773 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
775 target->state = TARGET_DEBUG_RUNNING;
776 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
777 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
783 /* int irqstepcount = 0; */
784 static int cortex_m_step(struct target *target, int current,
785 uint32_t address, int handle_breakpoints)
787 struct cortex_m_common *cortex_m = target_to_cm(target);
788 struct armv7m_common *armv7m = &cortex_m->armv7m;
789 struct breakpoint *breakpoint = NULL;
790 struct reg *pc = armv7m->arm.pc;
791 bool bkpt_inst_found = false;
793 bool isr_timed_out = false;
795 if (target->state != TARGET_HALTED) {
796 LOG_WARNING("target not halted");
797 return ERROR_TARGET_NOT_HALTED;
800 /* current = 1: continue on current pc, otherwise continue at <address> */
802 buf_set_u32(pc->value, 0, 32, address);
804 uint32_t pc_value = buf_get_u32(pc->value, 0, 32);
806 /* the front-end may request us not to handle breakpoints */
807 if (handle_breakpoints) {
808 breakpoint = breakpoint_find(target, pc_value);
810 cortex_m_unset_breakpoint(target, breakpoint);
813 armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found);
815 target->debug_reason = DBG_REASON_SINGLESTEP;
817 armv7m_restore_context(target);
819 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
821 /* if no bkpt instruction is found at pc then we can perform
822 * a normal step, otherwise we have to manually step over the bkpt
823 * instruction - as such simulate a step */
824 if (bkpt_inst_found == false) {
825 /* Automatic ISR masking mode off: Just step over the next instruction */
826 if ((cortex_m->isrmasking_mode != CORTEX_M_ISRMASK_AUTO))
827 cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
829 /* Process interrupts during stepping in a way they don't interfere
834 * Set a temporary break point at the current pc and let the core run
835 * with interrupts enabled. Pending interrupts get served and we run
836 * into the breakpoint again afterwards. Then we step over the next
837 * instruction with interrupts disabled.
839 * If the pending interrupts don't complete within time, we leave the
840 * core running. This may happen if the interrupts trigger faster
841 * than the core can process them or the handler doesn't return.
843 * If no more breakpoints are available we simply do a step with
844 * interrupts enabled.
850 * If a break point is already set on the lower half word then a break point on
851 * the upper half word will not break again when the core is restarted. So we
852 * just step over the instruction with interrupts disabled.
854 * The documentation has no information about this, it was found by observation
855 * on STM32F1 and STM32F2. Proper explanation welcome. STM32F0 dosen't seem to
856 * suffer from this problem.
858 * To add some confusion: pc_value has bit 0 always set, while the breakpoint
859 * address has it always cleared. The former is done to indicate thumb mode
863 if ((pc_value & 0x02) && breakpoint_find(target, pc_value & ~0x03)) {
864 LOG_DEBUG("Stepping over next instruction with interrupts disabled");
865 cortex_m_write_debug_halt_mask(target, C_HALT | C_MASKINTS, 0);
866 cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
867 /* Re-enable interrupts */
868 cortex_m_write_debug_halt_mask(target, C_HALT, C_MASKINTS);
872 /* Set a temporary break point */
874 retval = cortex_m_set_breakpoint(target, breakpoint);
876 retval = breakpoint_add(target, pc_value, 2, BKPT_TYPE_BY_ADDR(pc_value));
877 bool tmp_bp_set = (retval == ERROR_OK);
879 /* No more breakpoints left, just do a step */
881 cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
884 LOG_DEBUG("Starting core to serve pending interrupts");
885 int64_t t_start = timeval_ms();
886 cortex_m_write_debug_halt_mask(target, 0, C_HALT | C_STEP);
888 /* Wait for pending handlers to complete or timeout */
890 retval = mem_ap_read_atomic_u32(armv7m->debug_ap,
892 &cortex_m->dcb_dhcsr);
893 if (retval != ERROR_OK) {
894 target->state = TARGET_UNKNOWN;
897 isr_timed_out = ((timeval_ms() - t_start) > 500);
898 } while (!((cortex_m->dcb_dhcsr & S_HALT) || isr_timed_out));
900 /* only remove breakpoint if we created it */
902 cortex_m_unset_breakpoint(target, breakpoint);
904 /* Remove the temporary breakpoint */
905 breakpoint_remove(target, pc_value);
909 LOG_DEBUG("Interrupt handlers didn't complete within time, "
910 "leaving target running");
912 /* Step over next instruction with interrupts disabled */
913 cortex_m_write_debug_halt_mask(target,
916 cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
917 /* Re-enable interrupts */
918 cortex_m_write_debug_halt_mask(target, C_HALT, C_MASKINTS);
925 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
926 if (retval != ERROR_OK)
929 /* registers are now invalid */
930 register_cache_invalidate(armv7m->arm.core_cache);
933 cortex_m_set_breakpoint(target, breakpoint);
936 /* Leave the core running. The user has to stop execution manually. */
937 target->debug_reason = DBG_REASON_NOTHALTED;
938 target->state = TARGET_RUNNING;
942 LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
943 " nvic_icsr = 0x%" PRIx32,
944 cortex_m->dcb_dhcsr, cortex_m->nvic_icsr);
946 retval = cortex_m_debug_entry(target);
947 if (retval != ERROR_OK)
949 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
951 LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
952 " nvic_icsr = 0x%" PRIx32,
953 cortex_m->dcb_dhcsr, cortex_m->nvic_icsr);
958 static int cortex_m_assert_reset(struct target *target)
960 struct cortex_m_common *cortex_m = target_to_cm(target);
961 struct armv7m_common *armv7m = &cortex_m->armv7m;
962 enum cortex_m_soft_reset_config reset_config = cortex_m->soft_reset_config;
964 LOG_DEBUG("target->state: %s",
965 target_state_name(target));
967 enum reset_types jtag_reset_config = jtag_get_reset_config();
969 if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
970 /* allow scripts to override the reset event */
972 target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
973 register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
974 target->state = TARGET_RESET;
979 /* some cores support connecting while srst is asserted
980 * use that mode is it has been configured */
982 bool srst_asserted = false;
984 if ((jtag_reset_config & RESET_HAS_SRST) &&
985 (jtag_reset_config & RESET_SRST_NO_GATING)) {
986 adapter_assert_reset();
987 srst_asserted = true;
990 /* Enable debug requests */
992 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
993 /* Store important errors instead of failing and proceed to reset assert */
995 if (retval != ERROR_OK || !(cortex_m->dcb_dhcsr & C_DEBUGEN))
996 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DHCSR, DBGKEY | C_DEBUGEN);
998 /* If the processor is sleeping in a WFI or WFE instruction, the
999 * C_HALT bit must be asserted to regain control */
1000 if (retval == ERROR_OK && (cortex_m->dcb_dhcsr & S_SLEEP))
1001 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN);
1003 mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, 0);
1004 /* Ignore less important errors */
1006 if (!target->reset_halt) {
1007 /* Set/Clear C_MASKINTS in a separate operation */
1008 if (cortex_m->dcb_dhcsr & C_MASKINTS)
1009 mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DHCSR,
1010 DBGKEY | C_DEBUGEN | C_HALT);
1012 /* clear any debug flags before resuming */
1013 cortex_m_clear_halt(target);
1015 /* clear C_HALT in dhcsr reg */
1016 cortex_m_write_debug_halt_mask(target, 0, C_HALT);
1018 /* Halt in debug on reset; endreset_event() restores DEMCR.
1020 * REVISIT catching BUSERR presumably helps to defend against
1021 * bad vector table entries. Should this include MMERR or
1025 retval2 = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DEMCR,
1026 TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
1027 if (retval != ERROR_OK || retval2 != ERROR_OK)
1028 LOG_INFO("AP write error, reset will not halt");
1031 if (jtag_reset_config & RESET_HAS_SRST) {
1032 /* default to asserting srst */
1034 adapter_assert_reset();
1036 /* srst is asserted, ignore AP access errors */
1039 /* Use a standard Cortex-M3 software reset mechanism.
1040 * We default to using VECRESET as it is supported on all current cores.
1041 * This has the disadvantage of not resetting the peripherals, so a
1042 * reset-init event handler is needed to perform any peripheral resets.
1044 LOG_DEBUG("Using Cortex-M %s", (reset_config == CORTEX_M_RESET_SYSRESETREQ)
1045 ? "SYSRESETREQ" : "VECTRESET");
1047 if (reset_config == CORTEX_M_RESET_VECTRESET) {
1048 LOG_WARNING("Only resetting the Cortex-M core, use a reset-init event "
1049 "handler to reset any peripherals or configure hardware srst support.");
1053 retval3 = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_AIRCR,
1054 AIRCR_VECTKEY | ((reset_config == CORTEX_M_RESET_SYSRESETREQ)
1055 ? AIRCR_SYSRESETREQ : AIRCR_VECTRESET));
1056 if (retval3 != ERROR_OK)
1057 LOG_DEBUG("Ignoring AP write error right after reset");
1059 retval3 = dap_dp_init(armv7m->debug_ap->dap);
1060 if (retval3 != ERROR_OK)
1061 LOG_ERROR("DP initialisation failed");
1064 /* I do not know why this is necessary, but it
1065 * fixes strange effects (step/resume cause NMI
1066 * after reset) on LM3S6918 -- Michael Schwingen
1069 mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_AIRCR, &tmp);
1073 target->state = TARGET_RESET;
1074 jtag_add_sleep(50000);
1076 register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
1078 /* now return stored error code if any */
1079 if (retval != ERROR_OK)
1082 if (target->reset_halt) {
1083 retval = target_halt(target);
1084 if (retval != ERROR_OK)
1091 static int cortex_m_deassert_reset(struct target *target)
1093 struct armv7m_common *armv7m = &target_to_cm(target)->armv7m;
1095 LOG_DEBUG("target->state: %s",
1096 target_state_name(target));
1098 /* deassert reset lines */
1099 adapter_deassert_reset();
1101 enum reset_types jtag_reset_config = jtag_get_reset_config();
1103 if ((jtag_reset_config & RESET_HAS_SRST) &&
1104 !(jtag_reset_config & RESET_SRST_NO_GATING)) {
1105 int retval = dap_dp_init(armv7m->debug_ap->dap);
1106 if (retval != ERROR_OK) {
1107 LOG_ERROR("DP initialisation failed");
1115 int cortex_m_set_breakpoint(struct target *target, struct breakpoint *breakpoint)
1119 struct cortex_m_common *cortex_m = target_to_cm(target);
1120 struct cortex_m_fp_comparator *comparator_list = cortex_m->fp_comparator_list;
1122 if (breakpoint->set) {
1123 LOG_WARNING("breakpoint (BPID: %" PRIu32 ") already set", breakpoint->unique_id);
1127 if (cortex_m->auto_bp_type)
1128 breakpoint->type = BKPT_TYPE_BY_ADDR(breakpoint->address);
1130 if (breakpoint->type == BKPT_HARD) {
1131 uint32_t fpcr_value;
1132 while (comparator_list[fp_num].used && (fp_num < cortex_m->fp_num_code))
1134 if (fp_num >= cortex_m->fp_num_code) {
1135 LOG_ERROR("Can not find free FPB Comparator!");
1138 breakpoint->set = fp_num + 1;
1139 fpcr_value = breakpoint->address | 1;
1140 if (cortex_m->fp_rev == 0) {
1142 hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
1143 fpcr_value = (fpcr_value & 0x1FFFFFFC) | hilo | 1;
1144 } else if (cortex_m->fp_rev > 1) {
1145 LOG_ERROR("Unhandled Cortex-M Flash Patch Breakpoint architecture revision");
1148 comparator_list[fp_num].used = 1;
1149 comparator_list[fp_num].fpcr_value = fpcr_value;
1150 target_write_u32(target, comparator_list[fp_num].fpcr_address,
1151 comparator_list[fp_num].fpcr_value);
1152 LOG_DEBUG("fpc_num %i fpcr_value 0x%" PRIx32 "",
1154 comparator_list[fp_num].fpcr_value);
1155 if (!cortex_m->fpb_enabled) {
1156 LOG_DEBUG("FPB wasn't enabled, do it now");
1157 retval = cortex_m_enable_fpb(target);
1158 if (retval != ERROR_OK) {
1159 LOG_ERROR("Failed to enable the FPB");
1163 cortex_m->fpb_enabled = 1;
1165 } else if (breakpoint->type == BKPT_SOFT) {
1168 /* NOTE: on ARMv6-M and ARMv7-M, BKPT(0xab) is used for
1169 * semihosting; don't use that. Otherwise the BKPT
1170 * parameter is arbitrary.
1172 buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1173 retval = target_read_memory(target,
1174 breakpoint->address & 0xFFFFFFFE,
1175 breakpoint->length, 1,
1176 breakpoint->orig_instr);
1177 if (retval != ERROR_OK)
1179 retval = target_write_memory(target,
1180 breakpoint->address & 0xFFFFFFFE,
1181 breakpoint->length, 1,
1183 if (retval != ERROR_OK)
1185 breakpoint->set = true;
1188 LOG_DEBUG("BPID: %" PRIu32 ", Type: %d, Address: 0x%08" PRIx32 " Length: %d (set=%d)",
1189 breakpoint->unique_id,
1190 (int)(breakpoint->type),
1191 breakpoint->address,
1198 int cortex_m_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
1201 struct cortex_m_common *cortex_m = target_to_cm(target);
1202 struct cortex_m_fp_comparator *comparator_list = cortex_m->fp_comparator_list;
1204 if (!breakpoint->set) {
1205 LOG_WARNING("breakpoint not set");
1209 LOG_DEBUG("BPID: %" PRIu32 ", Type: %d, Address: 0x%08" PRIx32 " Length: %d (set=%d)",
1210 breakpoint->unique_id,
1211 (int)(breakpoint->type),
1212 breakpoint->address,
1216 if (breakpoint->type == BKPT_HARD) {
1217 int fp_num = breakpoint->set - 1;
1218 if ((fp_num < 0) || (fp_num >= cortex_m->fp_num_code)) {
1219 LOG_DEBUG("Invalid FP Comparator number in breakpoint");
1222 comparator_list[fp_num].used = 0;
1223 comparator_list[fp_num].fpcr_value = 0;
1224 target_write_u32(target, comparator_list[fp_num].fpcr_address,
1225 comparator_list[fp_num].fpcr_value);
1227 /* restore original instruction (kept in target endianness) */
1228 if (breakpoint->length == 4) {
1229 retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1,
1230 breakpoint->orig_instr);
1231 if (retval != ERROR_OK)
1234 retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1,
1235 breakpoint->orig_instr);
1236 if (retval != ERROR_OK)
1240 breakpoint->set = false;
1245 int cortex_m_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
1247 struct cortex_m_common *cortex_m = target_to_cm(target);
1249 if (cortex_m->auto_bp_type)
1250 breakpoint->type = BKPT_TYPE_BY_ADDR(breakpoint->address);
1252 if (breakpoint->type != BKPT_TYPE_BY_ADDR(breakpoint->address)) {
1253 if (breakpoint->type == BKPT_HARD) {
1254 LOG_INFO("flash patch comparator requested outside code memory region");
1255 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1258 if (breakpoint->type == BKPT_SOFT) {
1259 LOG_INFO("soft breakpoint requested in code (flash) memory region");
1260 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1264 if ((breakpoint->type == BKPT_HARD) && (cortex_m->fp_code_available < 1)) {
1265 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
1266 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1269 if (breakpoint->length == 3) {
1270 LOG_DEBUG("Using a two byte breakpoint for 32bit Thumb-2 request");
1271 breakpoint->length = 2;
1274 if ((breakpoint->length != 2)) {
1275 LOG_INFO("only breakpoints of two bytes length supported");
1276 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1279 if (breakpoint->type == BKPT_HARD)
1280 cortex_m->fp_code_available--;
1282 return cortex_m_set_breakpoint(target, breakpoint);
1285 int cortex_m_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
1287 struct cortex_m_common *cortex_m = target_to_cm(target);
1289 /* REVISIT why check? FBP can be updated with core running ... */
1290 if (target->state != TARGET_HALTED) {
1291 LOG_WARNING("target not halted");
1292 return ERROR_TARGET_NOT_HALTED;
1295 if (cortex_m->auto_bp_type)
1296 breakpoint->type = BKPT_TYPE_BY_ADDR(breakpoint->address);
1298 if (breakpoint->set)
1299 cortex_m_unset_breakpoint(target, breakpoint);
1301 if (breakpoint->type == BKPT_HARD)
1302 cortex_m->fp_code_available++;
1307 int cortex_m_set_watchpoint(struct target *target, struct watchpoint *watchpoint)
1310 uint32_t mask, temp;
1311 struct cortex_m_common *cortex_m = target_to_cm(target);
1313 /* watchpoint params were validated earlier */
1315 temp = watchpoint->length;
1322 /* REVISIT Don't fully trust these "not used" records ... users
1323 * may set up breakpoints by hand, e.g. dual-address data value
1324 * watchpoint using comparator #1; comparator #0 matching cycle
1325 * count; send data trace info through ITM and TPIU; etc
1327 struct cortex_m_dwt_comparator *comparator;
1329 for (comparator = cortex_m->dwt_comparator_list;
1330 comparator->used && dwt_num < cortex_m->dwt_num_comp;
1331 comparator++, dwt_num++)
1333 if (dwt_num >= cortex_m->dwt_num_comp) {
1334 LOG_ERROR("Can not find free DWT Comparator");
1337 comparator->used = 1;
1338 watchpoint->set = dwt_num + 1;
1340 comparator->comp = watchpoint->address;
1341 target_write_u32(target, comparator->dwt_comparator_address + 0,
1344 comparator->mask = mask;
1345 target_write_u32(target, comparator->dwt_comparator_address + 4,
1348 switch (watchpoint->rw) {
1350 comparator->function = 5;
1353 comparator->function = 6;
1356 comparator->function = 7;
1359 target_write_u32(target, comparator->dwt_comparator_address + 8,
1360 comparator->function);
1362 LOG_DEBUG("Watchpoint (ID %d) DWT%d 0x%08x 0x%x 0x%05x",
1363 watchpoint->unique_id, dwt_num,
1364 (unsigned) comparator->comp,
1365 (unsigned) comparator->mask,
1366 (unsigned) comparator->function);
1370 int cortex_m_unset_watchpoint(struct target *target, struct watchpoint *watchpoint)
1372 struct cortex_m_common *cortex_m = target_to_cm(target);
1373 struct cortex_m_dwt_comparator *comparator;
1376 if (!watchpoint->set) {
1377 LOG_WARNING("watchpoint (wpid: %d) not set",
1378 watchpoint->unique_id);
1382 dwt_num = watchpoint->set - 1;
1384 LOG_DEBUG("Watchpoint (ID %d) DWT%d address: 0x%08x clear",
1385 watchpoint->unique_id, dwt_num,
1386 (unsigned) watchpoint->address);
1388 if ((dwt_num < 0) || (dwt_num >= cortex_m->dwt_num_comp)) {
1389 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1393 comparator = cortex_m->dwt_comparator_list + dwt_num;
1394 comparator->used = 0;
1395 comparator->function = 0;
1396 target_write_u32(target, comparator->dwt_comparator_address + 8,
1397 comparator->function);
1399 watchpoint->set = false;
1404 int cortex_m_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
1406 struct cortex_m_common *cortex_m = target_to_cm(target);
1408 if (cortex_m->dwt_comp_available < 1) {
1409 LOG_DEBUG("no comparators?");
1410 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1413 /* hardware doesn't support data value masking */
1414 if (watchpoint->mask != ~(uint32_t)0) {
1415 LOG_DEBUG("watchpoint value masks not supported");
1416 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1419 /* hardware allows address masks of up to 32K */
1422 for (mask = 0; mask < 16; mask++) {
1423 if ((1u << mask) == watchpoint->length)
1427 LOG_DEBUG("unsupported watchpoint length");
1428 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1430 if (watchpoint->address & ((1 << mask) - 1)) {
1431 LOG_DEBUG("watchpoint address is unaligned");
1432 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1435 /* Caller doesn't seem to be able to describe watching for data
1436 * values of zero; that flags "no value".
1438 * REVISIT This DWT may well be able to watch for specific data
1439 * values. Requires comparator #1 to set DATAVMATCH and match
1440 * the data, and another comparator (DATAVADDR0) matching addr.
1442 if (watchpoint->value) {
1443 LOG_DEBUG("data value watchpoint not YET supported");
1444 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1447 cortex_m->dwt_comp_available--;
1448 LOG_DEBUG("dwt_comp_available: %d", cortex_m->dwt_comp_available);
1453 int cortex_m_remove_watchpoint(struct target *target, struct watchpoint *watchpoint)
1455 struct cortex_m_common *cortex_m = target_to_cm(target);
1457 /* REVISIT why check? DWT can be updated with core running ... */
1458 if (target->state != TARGET_HALTED) {
1459 LOG_WARNING("target not halted");
1460 return ERROR_TARGET_NOT_HALTED;
1463 if (watchpoint->set)
1464 cortex_m_unset_watchpoint(target, watchpoint);
1466 cortex_m->dwt_comp_available++;
1467 LOG_DEBUG("dwt_comp_available: %d", cortex_m->dwt_comp_available);
1472 void cortex_m_enable_watchpoints(struct target *target)
1474 struct watchpoint *watchpoint = target->watchpoints;
1476 /* set any pending watchpoints */
1477 while (watchpoint) {
1478 if (!watchpoint->set)
1479 cortex_m_set_watchpoint(target, watchpoint);
1480 watchpoint = watchpoint->next;
1484 static int cortex_m_load_core_reg_u32(struct target *target,
1485 uint32_t num, uint32_t *value)
1489 /* NOTE: we "know" here that the register identifiers used
1490 * in the v7m header match the Cortex-M3 Debug Core Register
1491 * Selector values for R0..R15, xPSR, MSP, and PSP.
1495 /* read a normal core register */
1496 retval = cortexm_dap_read_coreregister_u32(target, value, num);
1498 if (retval != ERROR_OK) {
1499 LOG_ERROR("JTAG failure %i", retval);
1500 return ERROR_JTAG_DEVICE_ERROR;
1502 LOG_DEBUG("load from core reg %i value 0x%" PRIx32 "", (int)num, *value);
1506 /* Floating-point Status and Registers */
1507 retval = target_write_u32(target, DCB_DCRSR, 0x21);
1508 if (retval != ERROR_OK)
1510 retval = target_read_u32(target, DCB_DCRDR, value);
1511 if (retval != ERROR_OK)
1513 LOG_DEBUG("load from FPSCR value 0x%" PRIx32, *value);
1516 case ARMV7M_S0 ... ARMV7M_S31:
1517 /* Floating-point Status and Registers */
1518 retval = target_write_u32(target, DCB_DCRSR, num - ARMV7M_S0 + 0x40);
1519 if (retval != ERROR_OK)
1521 retval = target_read_u32(target, DCB_DCRDR, value);
1522 if (retval != ERROR_OK)
1524 LOG_DEBUG("load from FPU reg S%d value 0x%" PRIx32,
1525 (int)(num - ARMV7M_S0), *value);
1528 case ARMV7M_PRIMASK:
1529 case ARMV7M_BASEPRI:
1530 case ARMV7M_FAULTMASK:
1531 case ARMV7M_CONTROL:
1532 /* Cortex-M3 packages these four registers as bitfields
1533 * in one Debug Core register. So say r0 and r2 docs;
1534 * it was removed from r1 docs, but still works.
1536 cortexm_dap_read_coreregister_u32(target, value, 20);
1539 case ARMV7M_PRIMASK:
1540 *value = buf_get_u32((uint8_t *)value, 0, 1);
1543 case ARMV7M_BASEPRI:
1544 *value = buf_get_u32((uint8_t *)value, 8, 8);
1547 case ARMV7M_FAULTMASK:
1548 *value = buf_get_u32((uint8_t *)value, 16, 1);
1551 case ARMV7M_CONTROL:
1552 *value = buf_get_u32((uint8_t *)value, 24, 2);
1556 LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "", (int)num, *value);
1560 return ERROR_COMMAND_SYNTAX_ERROR;
1566 static int cortex_m_store_core_reg_u32(struct target *target,
1567 uint32_t num, uint32_t value)
1571 struct armv7m_common *armv7m = target_to_armv7m(target);
1573 /* NOTE: we "know" here that the register identifiers used
1574 * in the v7m header match the Cortex-M3 Debug Core Register
1575 * Selector values for R0..R15, xPSR, MSP, and PSP.
1579 retval = cortexm_dap_write_coreregister_u32(target, value, num);
1580 if (retval != ERROR_OK) {
1583 LOG_ERROR("JTAG failure");
1584 r = armv7m->arm.core_cache->reg_list + num;
1585 r->dirty = r->valid;
1586 return ERROR_JTAG_DEVICE_ERROR;
1588 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
1592 /* Floating-point Status and Registers */
1593 retval = target_write_u32(target, DCB_DCRDR, value);
1594 if (retval != ERROR_OK)
1596 retval = target_write_u32(target, DCB_DCRSR, 0x21 | (1<<16));
1597 if (retval != ERROR_OK)
1599 LOG_DEBUG("write FPSCR value 0x%" PRIx32, value);
1602 case ARMV7M_S0 ... ARMV7M_S31:
1603 /* Floating-point Status and Registers */
1604 retval = target_write_u32(target, DCB_DCRDR, value);
1605 if (retval != ERROR_OK)
1607 retval = target_write_u32(target, DCB_DCRSR, (num - ARMV7M_S0 + 0x40) | (1<<16));
1608 if (retval != ERROR_OK)
1610 LOG_DEBUG("write FPU reg S%d value 0x%" PRIx32,
1611 (int)(num - ARMV7M_S0), value);
1614 case ARMV7M_PRIMASK:
1615 case ARMV7M_BASEPRI:
1616 case ARMV7M_FAULTMASK:
1617 case ARMV7M_CONTROL:
1618 /* Cortex-M3 packages these four registers as bitfields
1619 * in one Debug Core register. So say r0 and r2 docs;
1620 * it was removed from r1 docs, but still works.
1622 cortexm_dap_read_coreregister_u32(target, ®, 20);
1625 case ARMV7M_PRIMASK:
1626 buf_set_u32((uint8_t *)®, 0, 1, value);
1629 case ARMV7M_BASEPRI:
1630 buf_set_u32((uint8_t *)®, 8, 8, value);
1633 case ARMV7M_FAULTMASK:
1634 buf_set_u32((uint8_t *)®, 16, 1, value);
1637 case ARMV7M_CONTROL:
1638 buf_set_u32((uint8_t *)®, 24, 2, value);
1642 cortexm_dap_write_coreregister_u32(target, reg, 20);
1644 LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value);
1648 return ERROR_COMMAND_SYNTAX_ERROR;
1654 static int cortex_m_read_memory(struct target *target, uint32_t address,
1655 uint32_t size, uint32_t count, uint8_t *buffer)
1657 struct armv7m_common *armv7m = target_to_armv7m(target);
1659 if (armv7m->arm.is_armv6m) {
1660 /* armv6m does not handle unaligned memory access */
1661 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
1662 return ERROR_TARGET_UNALIGNED_ACCESS;
1665 return mem_ap_read_buf(armv7m->debug_ap, buffer, size, count, address);
1668 static int cortex_m_write_memory(struct target *target, uint32_t address,
1669 uint32_t size, uint32_t count, const uint8_t *buffer)
1671 struct armv7m_common *armv7m = target_to_armv7m(target);
1673 if (armv7m->arm.is_armv6m) {
1674 /* armv6m does not handle unaligned memory access */
1675 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
1676 return ERROR_TARGET_UNALIGNED_ACCESS;
1679 return mem_ap_write_buf(armv7m->debug_ap, buffer, size, count, address);
1682 static int cortex_m_init_target(struct command_context *cmd_ctx,
1683 struct target *target)
1685 armv7m_build_reg_cache(target);
1689 void cortex_m_deinit_target(struct target *target)
1691 struct cortex_m_common *cortex_m = target_to_cm(target);
1693 free(cortex_m->fp_comparator_list);
1695 cortex_m_dwt_free(target);
1696 armv7m_free_reg_cache(target);
1701 /* REVISIT cache valid/dirty bits are unmaintained. We could set "valid"
1702 * on r/w if the core is not running, and clear on resume or reset ... or
1703 * at least, in a post_restore_context() method.
1706 struct dwt_reg_state {
1707 struct target *target;
1709 uint8_t value[4]; /* scratch/cache */
1712 static int cortex_m_dwt_get_reg(struct reg *reg)
1714 struct dwt_reg_state *state = reg->arch_info;
1717 int retval = target_read_u32(state->target, state->addr, &tmp);
1718 if (retval != ERROR_OK)
1721 buf_set_u32(state->value, 0, 32, tmp);
1725 static int cortex_m_dwt_set_reg(struct reg *reg, uint8_t *buf)
1727 struct dwt_reg_state *state = reg->arch_info;
1729 return target_write_u32(state->target, state->addr,
1730 buf_get_u32(buf, 0, reg->size));
1739 static struct dwt_reg dwt_base_regs[] = {
1740 { DWT_CTRL, "dwt_ctrl", 32, },
1741 /* NOTE that Erratum 532314 (fixed r2p0) affects CYCCNT: it wrongly
1742 * increments while the core is asleep.
1744 { DWT_CYCCNT, "dwt_cyccnt", 32, },
1745 /* plus some 8 bit counters, useful for profiling with TPIU */
1748 static struct dwt_reg dwt_comp[] = {
1749 #define DWT_COMPARATOR(i) \
1750 { DWT_COMP0 + 0x10 * (i), "dwt_" #i "_comp", 32, }, \
1751 { DWT_MASK0 + 0x10 * (i), "dwt_" #i "_mask", 4, }, \
1752 { DWT_FUNCTION0 + 0x10 * (i), "dwt_" #i "_function", 32, }
1757 #undef DWT_COMPARATOR
1760 static const struct reg_arch_type dwt_reg_type = {
1761 .get = cortex_m_dwt_get_reg,
1762 .set = cortex_m_dwt_set_reg,
1765 static void cortex_m_dwt_addreg(struct target *t, struct reg *r, struct dwt_reg *d)
1767 struct dwt_reg_state *state;
1769 state = calloc(1, sizeof *state);
1772 state->addr = d->addr;
1777 r->value = state->value;
1778 r->arch_info = state;
1779 r->type = &dwt_reg_type;
1782 void cortex_m_dwt_setup(struct cortex_m_common *cm, struct target *target)
1785 struct reg_cache *cache;
1786 struct cortex_m_dwt_comparator *comparator;
1789 target_read_u32(target, DWT_CTRL, &dwtcr);
1791 LOG_DEBUG("no DWT");
1795 cm->dwt_num_comp = (dwtcr >> 28) & 0xF;
1796 cm->dwt_comp_available = cm->dwt_num_comp;
1797 cm->dwt_comparator_list = calloc(cm->dwt_num_comp,
1798 sizeof(struct cortex_m_dwt_comparator));
1799 if (!cm->dwt_comparator_list) {
1801 cm->dwt_num_comp = 0;
1802 LOG_ERROR("out of mem");
1806 cache = calloc(1, sizeof *cache);
1809 free(cm->dwt_comparator_list);
1812 cache->name = "Cortex-M DWT registers";
1813 cache->num_regs = 2 + cm->dwt_num_comp * 3;
1814 cache->reg_list = calloc(cache->num_regs, sizeof *cache->reg_list);
1815 if (!cache->reg_list) {
1820 for (reg = 0; reg < 2; reg++)
1821 cortex_m_dwt_addreg(target, cache->reg_list + reg,
1822 dwt_base_regs + reg);
1824 comparator = cm->dwt_comparator_list;
1825 for (i = 0; i < cm->dwt_num_comp; i++, comparator++) {
1828 comparator->dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1829 for (j = 0; j < 3; j++, reg++)
1830 cortex_m_dwt_addreg(target, cache->reg_list + reg,
1831 dwt_comp + 3 * i + j);
1833 /* make sure we clear any watchpoints enabled on the target */
1834 target_write_u32(target, comparator->dwt_comparator_address + 8, 0);
1837 *register_get_last_cache_p(&target->reg_cache) = cache;
1838 cm->dwt_cache = cache;
1840 LOG_DEBUG("DWT dwtcr 0x%" PRIx32 ", comp %d, watch%s",
1841 dwtcr, cm->dwt_num_comp,
1842 (dwtcr & (0xf << 24)) ? " only" : "/trigger");
1844 /* REVISIT: if num_comp > 1, check whether comparator #1 can
1845 * implement single-address data value watchpoints ... so we
1846 * won't need to check it later, when asked to set one up.
1850 static void cortex_m_dwt_free(struct target *target)
1852 struct cortex_m_common *cm = target_to_cm(target);
1853 struct reg_cache *cache = cm->dwt_cache;
1855 free(cm->dwt_comparator_list);
1856 cm->dwt_comparator_list = NULL;
1857 cm->dwt_num_comp = 0;
1860 register_unlink_cache(&target->reg_cache, cache);
1862 if (cache->reg_list) {
1863 for (size_t i = 0; i < cache->num_regs; i++)
1864 free(cache->reg_list[i].arch_info);
1865 free(cache->reg_list);
1869 cm->dwt_cache = NULL;
1872 #define MVFR0 0xe000ef40
1873 #define MVFR1 0xe000ef44
1875 #define MVFR0_DEFAULT_M4 0x10110021
1876 #define MVFR1_DEFAULT_M4 0x11000011
1878 #define MVFR0_DEFAULT_M7_SP 0x10110021
1879 #define MVFR0_DEFAULT_M7_DP 0x10110221
1880 #define MVFR1_DEFAULT_M7_SP 0x11000011
1881 #define MVFR1_DEFAULT_M7_DP 0x12000011
1883 int cortex_m_examine(struct target *target)
1886 uint32_t cpuid, fpcr, mvfr0, mvfr1;
1888 struct cortex_m_common *cortex_m = target_to_cm(target);
1889 struct adiv5_dap *swjdp = cortex_m->armv7m.arm.dap;
1890 struct armv7m_common *armv7m = target_to_armv7m(target);
1892 /* stlink shares the examine handler but does not support
1894 if (!armv7m->stlink) {
1895 retval = dap_dp_init(swjdp);
1896 if (retval != ERROR_OK) {
1897 LOG_ERROR("Could not initialize the debug port");
1901 /* Search for the MEM-AP */
1902 retval = dap_find_ap(swjdp, AP_TYPE_AHB_AP, &armv7m->debug_ap);
1903 if (retval != ERROR_OK) {
1904 LOG_ERROR("Could not find MEM-AP to control the core");
1908 /* Leave (only) generic DAP stuff for debugport_init(); */
1909 armv7m->debug_ap->memaccess_tck = 8;
1911 retval = mem_ap_init(armv7m->debug_ap);
1912 if (retval != ERROR_OK)
1916 if (!target_was_examined(target)) {
1917 target_set_examined(target);
1919 /* Read from Device Identification Registers */
1920 retval = target_read_u32(target, CPUID, &cpuid);
1921 if (retval != ERROR_OK)
1925 i = (cpuid >> 4) & 0xf;
1927 LOG_DEBUG("Cortex-M%d r%" PRId8 "p%" PRId8 " processor detected",
1928 i, (uint8_t)((cpuid >> 20) & 0xf), (uint8_t)((cpuid >> 0) & 0xf));
1931 rev = (cpuid >> 20) & 0xf;
1932 patch = (cpuid >> 0) & 0xf;
1933 if ((rev == 0) && (patch < 2))
1934 LOG_WARNING("Silicon bug: single stepping will enter pending exception handler!");
1936 LOG_DEBUG("cpuid: 0x%8.8" PRIx32 "", cpuid);
1939 target_read_u32(target, MVFR0, &mvfr0);
1940 target_read_u32(target, MVFR1, &mvfr1);
1942 /* test for floating point feature on Cortex-M4 */
1943 if ((mvfr0 == MVFR0_DEFAULT_M4) && (mvfr1 == MVFR1_DEFAULT_M4)) {
1944 LOG_DEBUG("Cortex-M%d floating point feature FPv4_SP found", i);
1945 armv7m->fp_feature = FPv4_SP;
1947 } else if (i == 7) {
1948 target_read_u32(target, MVFR0, &mvfr0);
1949 target_read_u32(target, MVFR1, &mvfr1);
1951 /* test for floating point features on Cortex-M7 */
1952 if ((mvfr0 == MVFR0_DEFAULT_M7_SP) && (mvfr1 == MVFR1_DEFAULT_M7_SP)) {
1953 LOG_DEBUG("Cortex-M%d floating point feature FPv5_SP found", i);
1954 armv7m->fp_feature = FPv5_SP;
1955 } else if ((mvfr0 == MVFR0_DEFAULT_M7_DP) && (mvfr1 == MVFR1_DEFAULT_M7_DP)) {
1956 LOG_DEBUG("Cortex-M%d floating point feature FPv5_DP found", i);
1957 armv7m->fp_feature = FPv5_DP;
1959 } else if (i == 0) {
1960 /* Cortex-M0 does not support unaligned memory access */
1961 armv7m->arm.is_armv6m = true;
1964 if (armv7m->fp_feature == FP_NONE &&
1965 armv7m->arm.core_cache->num_regs > ARMV7M_NUM_CORE_REGS_NOFP) {
1966 /* free unavailable FPU registers */
1969 for (idx = ARMV7M_NUM_CORE_REGS_NOFP;
1970 idx < armv7m->arm.core_cache->num_regs;
1972 free(armv7m->arm.core_cache->reg_list[idx].value);
1973 free(armv7m->arm.core_cache->reg_list[idx].feature);
1974 free(armv7m->arm.core_cache->reg_list[idx].reg_data_type);
1976 armv7m->arm.core_cache->num_regs = ARMV7M_NUM_CORE_REGS_NOFP;
1979 if ((i == 3 || i == 4 || i == 7) && !armv7m->stlink) {
1980 /* Cortex-M3/M4/M7 have at least 4096 bytes autoincrement range,
1981 * s. ARM IHI 0031C: MEM-AP 7.2.2 */
1982 armv7m->debug_ap->tar_autoincr_block = (1 << 12);
1985 /* Configure trace modules */
1986 retval = target_write_u32(target, DCB_DEMCR, TRCENA | armv7m->demcr);
1987 if (retval != ERROR_OK)
1990 if (armv7m->trace_config.config_type != DISABLED) {
1991 armv7m_trace_tpiu_config(target);
1992 armv7m_trace_itm_config(target);
1995 /* NOTE: FPB and DWT are both optional. */
1998 target_read_u32(target, FP_CTRL, &fpcr);
1999 cortex_m->auto_bp_type = 1;
2000 /* bits [14:12] and [7:4] */
2001 cortex_m->fp_num_code = ((fpcr >> 8) & 0x70) | ((fpcr >> 4) & 0xF);
2002 cortex_m->fp_num_lit = (fpcr >> 8) & 0xF;
2003 cortex_m->fp_code_available = cortex_m->fp_num_code;
2004 /* Detect flash patch revision, see RM DDI 0403E.b page C1-817.
2005 Revision is zero base, fp_rev == 1 means Rev.2 ! */
2006 cortex_m->fp_rev = (fpcr >> 28) & 0xf;
2007 free(cortex_m->fp_comparator_list);
2008 cortex_m->fp_comparator_list = calloc(
2009 cortex_m->fp_num_code + cortex_m->fp_num_lit,
2010 sizeof(struct cortex_m_fp_comparator));
2011 cortex_m->fpb_enabled = fpcr & 1;
2012 for (i = 0; i < cortex_m->fp_num_code + cortex_m->fp_num_lit; i++) {
2013 cortex_m->fp_comparator_list[i].type =
2014 (i < cortex_m->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
2015 cortex_m->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
2017 /* make sure we clear any breakpoints enabled on the target */
2018 target_write_u32(target, cortex_m->fp_comparator_list[i].fpcr_address, 0);
2020 LOG_DEBUG("FPB fpcr 0x%" PRIx32 ", numcode %i, numlit %i",
2022 cortex_m->fp_num_code,
2023 cortex_m->fp_num_lit);
2026 cortex_m_dwt_free(target);
2027 cortex_m_dwt_setup(cortex_m, target);
2029 /* These hardware breakpoints only work for code in flash! */
2030 LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
2031 target_name(target),
2032 cortex_m->fp_num_code,
2033 cortex_m->dwt_num_comp);
2039 static int cortex_m_dcc_read(struct target *target, uint8_t *value, uint8_t *ctrl)
2041 struct armv7m_common *armv7m = target_to_armv7m(target);
2046 retval = mem_ap_read_buf_noincr(armv7m->debug_ap, buf, 2, 1, DCB_DCRDR);
2047 if (retval != ERROR_OK)
2050 dcrdr = target_buffer_get_u16(target, buf);
2051 *ctrl = (uint8_t)dcrdr;
2052 *value = (uint8_t)(dcrdr >> 8);
2054 LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
2056 /* write ack back to software dcc register
2057 * signify we have read data */
2058 if (dcrdr & (1 << 0)) {
2059 target_buffer_set_u16(target, buf, 0);
2060 retval = mem_ap_write_buf_noincr(armv7m->debug_ap, buf, 2, 1, DCB_DCRDR);
2061 if (retval != ERROR_OK)
2068 static int cortex_m_target_request_data(struct target *target,
2069 uint32_t size, uint8_t *buffer)
2075 for (i = 0; i < (size * 4); i++) {
2076 int retval = cortex_m_dcc_read(target, &data, &ctrl);
2077 if (retval != ERROR_OK)
2085 static int cortex_m_handle_target_request(void *priv)
2087 struct target *target = priv;
2088 if (!target_was_examined(target))
2091 if (!target->dbg_msg_enabled)
2094 if (target->state == TARGET_RUNNING) {
2099 retval = cortex_m_dcc_read(target, &data, &ctrl);
2100 if (retval != ERROR_OK)
2103 /* check if we have data */
2104 if (ctrl & (1 << 0)) {
2107 /* we assume target is quick enough */
2109 for (int i = 1; i <= 3; i++) {
2110 retval = cortex_m_dcc_read(target, &data, &ctrl);
2111 if (retval != ERROR_OK)
2113 request |= ((uint32_t)data << (i * 8));
2115 target_request(target, request);
2122 static int cortex_m_init_arch_info(struct target *target,
2123 struct cortex_m_common *cortex_m, struct jtag_tap *tap)
2125 struct armv7m_common *armv7m = &cortex_m->armv7m;
2127 armv7m_init_arch_info(target, armv7m);
2129 /* tap has no dap initialized */
2131 tap->dap = dap_init();
2133 /* Leave (only) generic DAP stuff for debugport_init() */
2134 tap->dap->tap = tap;
2137 /* default reset mode is to use srst if fitted
2138 * if not it will use CORTEX_M3_RESET_VECTRESET */
2139 cortex_m->soft_reset_config = CORTEX_M_RESET_VECTRESET;
2141 armv7m->arm.dap = tap->dap;
2143 /* register arch-specific functions */
2144 armv7m->examine_debug_reason = cortex_m_examine_debug_reason;
2146 armv7m->post_debug_entry = NULL;
2148 armv7m->pre_restore_context = NULL;
2150 armv7m->load_core_reg_u32 = cortex_m_load_core_reg_u32;
2151 armv7m->store_core_reg_u32 = cortex_m_store_core_reg_u32;
2153 target_register_timer_callback(cortex_m_handle_target_request, 1, 1, target);
2158 static int cortex_m_target_create(struct target *target, Jim_Interp *interp)
2160 struct cortex_m_common *cortex_m = calloc(1, sizeof(struct cortex_m_common));
2162 cortex_m->common_magic = CORTEX_M_COMMON_MAGIC;
2163 cortex_m_init_arch_info(target, cortex_m, target->tap);
2168 /*--------------------------------------------------------------------------*/
2170 static int cortex_m_verify_pointer(struct command_context *cmd_ctx,
2171 struct cortex_m_common *cm)
2173 if (cm->common_magic != CORTEX_M_COMMON_MAGIC) {
2174 command_print(cmd_ctx, "target is not a Cortex-M");
2175 return ERROR_TARGET_INVALID;
2181 * Only stuff below this line should need to verify that its target
2182 * is a Cortex-M3. Everything else should have indirected through the
2183 * cortexm3_target structure, which is only used with CM3 targets.
2186 static const struct {
2190 { "hard_err", VC_HARDERR, },
2191 { "int_err", VC_INTERR, },
2192 { "bus_err", VC_BUSERR, },
2193 { "state_err", VC_STATERR, },
2194 { "chk_err", VC_CHKERR, },
2195 { "nocp_err", VC_NOCPERR, },
2196 { "mm_err", VC_MMERR, },
2197 { "reset", VC_CORERESET, },
2200 COMMAND_HANDLER(handle_cortex_m_vector_catch_command)
2202 struct target *target = get_current_target(CMD_CTX);
2203 struct cortex_m_common *cortex_m = target_to_cm(target);
2204 struct armv7m_common *armv7m = &cortex_m->armv7m;
2208 retval = cortex_m_verify_pointer(CMD_CTX, cortex_m);
2209 if (retval != ERROR_OK)
2212 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &demcr);
2213 if (retval != ERROR_OK)
2219 if (CMD_ARGC == 1) {
2220 if (strcmp(CMD_ARGV[0], "all") == 0) {
2221 catch = VC_HARDERR | VC_INTERR | VC_BUSERR
2222 | VC_STATERR | VC_CHKERR | VC_NOCPERR
2223 | VC_MMERR | VC_CORERESET;
2225 } else if (strcmp(CMD_ARGV[0], "none") == 0)
2228 while (CMD_ARGC-- > 0) {
2230 for (i = 0; i < ARRAY_SIZE(vec_ids); i++) {
2231 if (strcmp(CMD_ARGV[CMD_ARGC], vec_ids[i].name) != 0)
2233 catch |= vec_ids[i].mask;
2236 if (i == ARRAY_SIZE(vec_ids)) {
2237 LOG_ERROR("No CM3 vector '%s'", CMD_ARGV[CMD_ARGC]);
2238 return ERROR_COMMAND_SYNTAX_ERROR;
2242 /* For now, armv7m->demcr only stores vector catch flags. */
2243 armv7m->demcr = catch;
2248 /* write, but don't assume it stuck (why not??) */
2249 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR, demcr);
2250 if (retval != ERROR_OK)
2252 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &demcr);
2253 if (retval != ERROR_OK)
2256 /* FIXME be sure to clear DEMCR on clean server shutdown.
2257 * Otherwise the vector catch hardware could fire when there's
2258 * no debugger hooked up, causing much confusion...
2262 for (unsigned i = 0; i < ARRAY_SIZE(vec_ids); i++) {
2263 command_print(CMD_CTX, "%9s: %s", vec_ids[i].name,
2264 (demcr & vec_ids[i].mask) ? "catch" : "ignore");
2270 COMMAND_HANDLER(handle_cortex_m_mask_interrupts_command)
2272 struct target *target = get_current_target(CMD_CTX);
2273 struct cortex_m_common *cortex_m = target_to_cm(target);
2276 static const Jim_Nvp nvp_maskisr_modes[] = {
2277 { .name = "auto", .value = CORTEX_M_ISRMASK_AUTO },
2278 { .name = "off", .value = CORTEX_M_ISRMASK_OFF },
2279 { .name = "on", .value = CORTEX_M_ISRMASK_ON },
2280 { .name = NULL, .value = -1 },
2285 retval = cortex_m_verify_pointer(CMD_CTX, cortex_m);
2286 if (retval != ERROR_OK)
2289 if (target->state != TARGET_HALTED) {
2290 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
2295 n = Jim_Nvp_name2value_simple(nvp_maskisr_modes, CMD_ARGV[0]);
2296 if (n->name == NULL)
2297 return ERROR_COMMAND_SYNTAX_ERROR;
2298 cortex_m->isrmasking_mode = n->value;
2301 if (cortex_m->isrmasking_mode == CORTEX_M_ISRMASK_ON)
2302 cortex_m_write_debug_halt_mask(target, C_HALT | C_MASKINTS, 0);
2304 cortex_m_write_debug_halt_mask(target, C_HALT, C_MASKINTS);
2307 n = Jim_Nvp_value2name_simple(nvp_maskisr_modes, cortex_m->isrmasking_mode);
2308 command_print(CMD_CTX, "cortex_m interrupt mask %s", n->name);
2313 COMMAND_HANDLER(handle_cortex_m_reset_config_command)
2315 struct target *target = get_current_target(CMD_CTX);
2316 struct cortex_m_common *cortex_m = target_to_cm(target);
2320 retval = cortex_m_verify_pointer(CMD_CTX, cortex_m);
2321 if (retval != ERROR_OK)
2325 if (strcmp(*CMD_ARGV, "sysresetreq") == 0)
2326 cortex_m->soft_reset_config = CORTEX_M_RESET_SYSRESETREQ;
2327 else if (strcmp(*CMD_ARGV, "vectreset") == 0)
2328 cortex_m->soft_reset_config = CORTEX_M_RESET_VECTRESET;
2331 switch (cortex_m->soft_reset_config) {
2332 case CORTEX_M_RESET_SYSRESETREQ:
2333 reset_config = "sysresetreq";
2336 case CORTEX_M_RESET_VECTRESET:
2337 reset_config = "vectreset";
2341 reset_config = "unknown";
2345 command_print(CMD_CTX, "cortex_m reset_config %s", reset_config);
2350 static const struct command_registration cortex_m_exec_command_handlers[] = {
2353 .handler = handle_cortex_m_mask_interrupts_command,
2354 .mode = COMMAND_EXEC,
2355 .help = "mask cortex_m interrupts",
2356 .usage = "['auto'|'on'|'off']",
2359 .name = "vector_catch",
2360 .handler = handle_cortex_m_vector_catch_command,
2361 .mode = COMMAND_EXEC,
2362 .help = "configure hardware vectors to trigger debug entry",
2363 .usage = "['all'|'none'|('bus_err'|'chk_err'|...)*]",
2366 .name = "reset_config",
2367 .handler = handle_cortex_m_reset_config_command,
2368 .mode = COMMAND_ANY,
2369 .help = "configure software reset handling",
2370 .usage = "['srst'|'sysresetreq'|'vectreset']",
2372 COMMAND_REGISTRATION_DONE
2374 static const struct command_registration cortex_m_command_handlers[] = {
2376 .chain = armv7m_command_handlers,
2379 .chain = armv7m_trace_command_handlers,
2383 .mode = COMMAND_EXEC,
2384 .help = "Cortex-M command group",
2386 .chain = cortex_m_exec_command_handlers,
2388 COMMAND_REGISTRATION_DONE
2391 struct target_type cortexm_target = {
2393 .deprecated_name = "cortex_m3",
2395 .poll = cortex_m_poll,
2396 .arch_state = armv7m_arch_state,
2398 .target_request_data = cortex_m_target_request_data,
2400 .halt = cortex_m_halt,
2401 .resume = cortex_m_resume,
2402 .step = cortex_m_step,
2404 .assert_reset = cortex_m_assert_reset,
2405 .deassert_reset = cortex_m_deassert_reset,
2406 .soft_reset_halt = cortex_m_soft_reset_halt,
2408 .get_gdb_reg_list = armv7m_get_gdb_reg_list,
2410 .read_memory = cortex_m_read_memory,
2411 .write_memory = cortex_m_write_memory,
2412 .checksum_memory = armv7m_checksum_memory,
2413 .blank_check_memory = armv7m_blank_check_memory,
2415 .run_algorithm = armv7m_run_algorithm,
2416 .start_algorithm = armv7m_start_algorithm,
2417 .wait_algorithm = armv7m_wait_algorithm,
2419 .add_breakpoint = cortex_m_add_breakpoint,
2420 .remove_breakpoint = cortex_m_remove_breakpoint,
2421 .add_watchpoint = cortex_m_add_watchpoint,
2422 .remove_watchpoint = cortex_m_remove_watchpoint,
2424 .commands = cortex_m_command_handlers,
2425 .target_create = cortex_m_target_create,
2426 .init_target = cortex_m_init_target,
2427 .examine = cortex_m_examine,
2428 .deinit_target = cortex_m_deinit_target,