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, write to the *
23 * Free Software Foundation, Inc., *
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
27 * Cortex-M3(tm) TRM, ARM DDI 0337E (r1p1) and 0337G (r2p0) *
29 ***************************************************************************/
34 #include "jtag/interface.h"
35 #include "breakpoints.h"
37 #include "target_request.h"
38 #include "target_type.h"
39 #include "arm_disassembler.h"
41 #include "arm_opcodes.h"
42 #include "arm_semihosting.h"
43 #include <helper/time_support.h>
45 /* NOTE: most of this should work fine for the Cortex-M1 and
46 * Cortex-M0 cores too, although they're ARMv6-M not ARMv7-M.
47 * Some differences: M0/M1 doesn't have FBP remapping or the
48 * DWT tracing/profiling support. (So the cycle counter will
49 * not be usable; the other stuff isn't currently used here.)
51 * Although there are some workarounds for errata seen only in r0p0
52 * silicon, such old parts are hard to find and thus not much tested
57 * Returns the type of a break point required by address location
59 #define BKPT_TYPE_BY_ADDR(addr) ((addr) < 0x20000000 ? BKPT_HARD : BKPT_SOFT)
61 /* forward declarations */
62 static int cortex_m_store_core_reg_u32(struct target
*target
,
63 uint32_t num
, uint32_t value
);
65 static int cortexm_dap_read_coreregister_u32(struct target
*target
,
66 uint32_t *value
, int regnum
)
68 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
69 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
73 /* because the DCB_DCRDR is used for the emulated dcc channel
74 * we have to save/restore the DCB_DCRDR when used */
75 if (target
->dbg_msg_enabled
) {
76 retval
= mem_ap_read_u32(swjdp
, DCB_DCRDR
, &dcrdr
);
77 if (retval
!= ERROR_OK
)
81 retval
= mem_ap_write_u32(swjdp
, DCB_DCRSR
, regnum
);
82 if (retval
!= ERROR_OK
)
85 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DCRDR
, value
);
86 if (retval
!= ERROR_OK
)
89 if (target
->dbg_msg_enabled
) {
90 /* restore DCB_DCRDR - this needs to be in a separate
91 * transaction otherwise the emulated DCC channel breaks */
92 if (retval
== ERROR_OK
)
93 retval
= mem_ap_write_atomic_u32(swjdp
, DCB_DCRDR
, dcrdr
);
99 static int cortexm_dap_write_coreregister_u32(struct target
*target
,
100 uint32_t value
, int regnum
)
102 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
103 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
107 /* because the DCB_DCRDR is used for the emulated dcc channel
108 * we have to save/restore the DCB_DCRDR when used */
109 if (target
->dbg_msg_enabled
) {
110 retval
= mem_ap_read_u32(swjdp
, DCB_DCRDR
, &dcrdr
);
111 if (retval
!= ERROR_OK
)
115 retval
= mem_ap_write_u32(swjdp
, DCB_DCRDR
, value
);
116 if (retval
!= ERROR_OK
)
119 retval
= mem_ap_write_atomic_u32(swjdp
, DCB_DCRSR
, regnum
| DCRSR_WnR
);
120 if (retval
!= ERROR_OK
)
123 if (target
->dbg_msg_enabled
) {
124 /* restore DCB_DCRDR - this needs to be in a seperate
125 * transaction otherwise the emulated DCC channel breaks */
126 if (retval
== ERROR_OK
)
127 retval
= mem_ap_write_atomic_u32(swjdp
, DCB_DCRDR
, dcrdr
);
133 static int cortex_m_write_debug_halt_mask(struct target
*target
,
134 uint32_t mask_on
, uint32_t mask_off
)
136 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
137 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
139 /* mask off status bits */
140 cortex_m
->dcb_dhcsr
&= ~((0xFFFF << 16) | mask_off
);
141 /* create new register mask */
142 cortex_m
->dcb_dhcsr
|= DBGKEY
| C_DEBUGEN
| mask_on
;
144 return mem_ap_write_atomic_u32(swjdp
, DCB_DHCSR
, cortex_m
->dcb_dhcsr
);
147 static int cortex_m_clear_halt(struct target
*target
)
149 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
150 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
153 /* clear step if any */
154 cortex_m_write_debug_halt_mask(target
, C_HALT
, C_STEP
);
156 /* Read Debug Fault Status Register */
157 retval
= mem_ap_read_atomic_u32(swjdp
, NVIC_DFSR
, &cortex_m
->nvic_dfsr
);
158 if (retval
!= ERROR_OK
)
161 /* Clear Debug Fault Status */
162 retval
= mem_ap_write_atomic_u32(swjdp
, NVIC_DFSR
, cortex_m
->nvic_dfsr
);
163 if (retval
!= ERROR_OK
)
165 LOG_DEBUG(" NVIC_DFSR 0x%" PRIx32
"", cortex_m
->nvic_dfsr
);
170 static int cortex_m_single_step_core(struct target
*target
)
172 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
173 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
177 /* backup dhcsr reg */
178 dhcsr_save
= cortex_m
->dcb_dhcsr
;
180 /* Mask interrupts before clearing halt, if done already. This avoids
181 * Erratum 377497 (fixed in r1p0) where setting MASKINTS while clearing
182 * HALT can put the core into an unknown state.
184 if (!(cortex_m
->dcb_dhcsr
& C_MASKINTS
)) {
185 retval
= mem_ap_write_atomic_u32(swjdp
, DCB_DHCSR
,
186 DBGKEY
| C_MASKINTS
| C_HALT
| C_DEBUGEN
);
187 if (retval
!= ERROR_OK
)
190 retval
= mem_ap_write_atomic_u32(swjdp
, DCB_DHCSR
,
191 DBGKEY
| C_MASKINTS
| C_STEP
| C_DEBUGEN
);
192 if (retval
!= ERROR_OK
)
196 /* restore dhcsr reg */
197 cortex_m
->dcb_dhcsr
= dhcsr_save
;
198 cortex_m_clear_halt(target
);
203 static int cortex_m_enable_fpb(struct target
*target
)
205 int retval
= target_write_u32(target
, FP_CTRL
, 3);
206 if (retval
!= ERROR_OK
)
209 /* check the fpb is actually enabled */
211 retval
= target_read_u32(target
, FP_CTRL
, &fpctrl
);
212 if (retval
!= ERROR_OK
)
221 static int cortex_m_endreset_event(struct target
*target
)
226 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
227 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
228 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
229 struct cortex_m_fp_comparator
*fp_list
= cortex_m
->fp_comparator_list
;
230 struct cortex_m_dwt_comparator
*dwt_list
= cortex_m
->dwt_comparator_list
;
232 /* REVISIT The four debug monitor bits are currently ignored... */
233 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DEMCR
, &dcb_demcr
);
234 if (retval
!= ERROR_OK
)
236 LOG_DEBUG("DCB_DEMCR = 0x%8.8" PRIx32
"", dcb_demcr
);
238 /* this register is used for emulated dcc channel */
239 retval
= mem_ap_write_u32(swjdp
, DCB_DCRDR
, 0);
240 if (retval
!= ERROR_OK
)
243 /* Enable debug requests */
244 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
245 if (retval
!= ERROR_OK
)
247 if (!(cortex_m
->dcb_dhcsr
& C_DEBUGEN
)) {
248 retval
= mem_ap_write_u32(swjdp
, DCB_DHCSR
, DBGKEY
| C_DEBUGEN
);
249 if (retval
!= ERROR_OK
)
253 /* clear any interrupt masking */
254 cortex_m_write_debug_halt_mask(target
, 0, C_MASKINTS
);
256 /* Enable features controlled by ITM and DWT blocks, and catch only
257 * the vectors we were told to pay attention to.
259 * Target firmware is responsible for all fault handling policy
260 * choices *EXCEPT* explicitly scripted overrides like "vector_catch"
261 * or manual updates to the NVIC SHCSR and CCR registers.
263 retval
= mem_ap_write_u32(swjdp
, DCB_DEMCR
, TRCENA
| armv7m
->demcr
);
264 if (retval
!= ERROR_OK
)
267 /* Paranoia: evidently some (early?) chips don't preserve all the
268 * debug state (including FBP, DWT, etc) across reset...
272 retval
= cortex_m_enable_fpb(target
);
273 if (retval
!= ERROR_OK
) {
274 LOG_ERROR("Failed to enable the FPB");
278 cortex_m
->fpb_enabled
= 1;
280 /* Restore FPB registers */
281 for (i
= 0; i
< cortex_m
->fp_num_code
+ cortex_m
->fp_num_lit
; i
++) {
282 retval
= target_write_u32(target
, fp_list
[i
].fpcr_address
, fp_list
[i
].fpcr_value
);
283 if (retval
!= ERROR_OK
)
287 /* Restore DWT registers */
288 for (i
= 0; i
< cortex_m
->dwt_num_comp
; i
++) {
289 retval
= target_write_u32(target
, dwt_list
[i
].dwt_comparator_address
+ 0,
291 if (retval
!= ERROR_OK
)
293 retval
= target_write_u32(target
, dwt_list
[i
].dwt_comparator_address
+ 4,
295 if (retval
!= ERROR_OK
)
297 retval
= target_write_u32(target
, dwt_list
[i
].dwt_comparator_address
+ 8,
298 dwt_list
[i
].function
);
299 if (retval
!= ERROR_OK
)
302 retval
= dap_run(swjdp
);
303 if (retval
!= ERROR_OK
)
306 register_cache_invalidate(armv7m
->arm
.core_cache
);
308 /* make sure we have latest dhcsr flags */
309 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
314 static int cortex_m_examine_debug_reason(struct target
*target
)
316 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
318 /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason
319 * only check the debug reason if we don't know it already */
321 if ((target
->debug_reason
!= DBG_REASON_DBGRQ
)
322 && (target
->debug_reason
!= DBG_REASON_SINGLESTEP
)) {
323 if (cortex_m
->nvic_dfsr
& DFSR_BKPT
) {
324 target
->debug_reason
= DBG_REASON_BREAKPOINT
;
325 if (cortex_m
->nvic_dfsr
& DFSR_DWTTRAP
)
326 target
->debug_reason
= DBG_REASON_WPTANDBKPT
;
327 } else if (cortex_m
->nvic_dfsr
& DFSR_DWTTRAP
)
328 target
->debug_reason
= DBG_REASON_WATCHPOINT
;
329 else if (cortex_m
->nvic_dfsr
& DFSR_VCATCH
)
330 target
->debug_reason
= DBG_REASON_BREAKPOINT
;
331 else /* EXTERNAL, HALTED */
332 target
->debug_reason
= DBG_REASON_UNDEFINED
;
338 static int cortex_m_examine_exception_reason(struct target
*target
)
340 uint32_t shcsr
= 0, except_sr
= 0, cfsr
= -1, except_ar
= -1;
341 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
342 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
345 retval
= mem_ap_read_u32(swjdp
, NVIC_SHCSR
, &shcsr
);
346 if (retval
!= ERROR_OK
)
348 switch (armv7m
->exception_number
) {
351 case 3: /* Hard Fault */
352 retval
= mem_ap_read_atomic_u32(swjdp
, NVIC_HFSR
, &except_sr
);
353 if (retval
!= ERROR_OK
)
355 if (except_sr
& 0x40000000) {
356 retval
= mem_ap_read_u32(swjdp
, NVIC_CFSR
, &cfsr
);
357 if (retval
!= ERROR_OK
)
361 case 4: /* Memory Management */
362 retval
= mem_ap_read_u32(swjdp
, NVIC_CFSR
, &except_sr
);
363 if (retval
!= ERROR_OK
)
365 retval
= mem_ap_read_u32(swjdp
, NVIC_MMFAR
, &except_ar
);
366 if (retval
!= ERROR_OK
)
369 case 5: /* Bus Fault */
370 retval
= mem_ap_read_u32(swjdp
, NVIC_CFSR
, &except_sr
);
371 if (retval
!= ERROR_OK
)
373 retval
= mem_ap_read_u32(swjdp
, NVIC_BFAR
, &except_ar
);
374 if (retval
!= ERROR_OK
)
377 case 6: /* Usage Fault */
378 retval
= mem_ap_read_u32(swjdp
, NVIC_CFSR
, &except_sr
);
379 if (retval
!= ERROR_OK
)
382 case 11: /* SVCall */
384 case 12: /* Debug Monitor */
385 retval
= mem_ap_read_u32(swjdp
, NVIC_DFSR
, &except_sr
);
386 if (retval
!= ERROR_OK
)
389 case 14: /* PendSV */
391 case 15: /* SysTick */
397 retval
= dap_run(swjdp
);
398 if (retval
== ERROR_OK
)
399 LOG_DEBUG("%s SHCSR 0x%" PRIx32
", SR 0x%" PRIx32
400 ", CFSR 0x%" PRIx32
", AR 0x%" PRIx32
,
401 armv7m_exception_string(armv7m
->exception_number
),
402 shcsr
, except_sr
, cfsr
, except_ar
);
406 static int cortex_m_debug_entry(struct target
*target
)
411 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
412 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
413 struct arm
*arm
= &armv7m
->arm
;
414 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
419 cortex_m_clear_halt(target
);
420 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
421 if (retval
!= ERROR_OK
)
424 retval
= armv7m
->examine_debug_reason(target
);
425 if (retval
!= ERROR_OK
)
428 /* Examine target state and mode
429 * First load register accessible through core debug port */
430 int num_regs
= arm
->core_cache
->num_regs
;
432 for (i
= 0; i
< num_regs
; i
++) {
433 r
= &armv7m
->arm
.core_cache
->reg_list
[i
];
435 arm
->read_core_reg(target
, r
, i
, ARM_MODE_ANY
);
439 xPSR
= buf_get_u32(r
->value
, 0, 32);
441 /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
444 cortex_m_store_core_reg_u32(target
, 16, xPSR
& ~0xff);
447 /* Are we in an exception handler */
449 armv7m
->exception_number
= (xPSR
& 0x1FF);
451 arm
->core_mode
= ARM_MODE_HANDLER
;
452 arm
->map
= armv7m_msp_reg_map
;
454 unsigned control
= buf_get_u32(arm
->core_cache
455 ->reg_list
[ARMV7M_CONTROL
].value
, 0, 2);
457 /* is this thread privileged? */
458 arm
->core_mode
= control
& 1
459 ? ARM_MODE_USER_THREAD
462 /* which stack is it using? */
464 arm
->map
= armv7m_psp_reg_map
;
466 arm
->map
= armv7m_msp_reg_map
;
468 armv7m
->exception_number
= 0;
471 if (armv7m
->exception_number
)
472 cortex_m_examine_exception_reason(target
);
474 LOG_DEBUG("entered debug state in core mode: %s at PC 0x%" PRIx32
", target->state: %s",
475 arm_mode_name(arm
->core_mode
),
476 *(uint32_t *)(arm
->pc
->value
),
477 target_state_name(target
));
479 if (armv7m
->post_debug_entry
) {
480 retval
= armv7m
->post_debug_entry(target
);
481 if (retval
!= ERROR_OK
)
488 static int cortex_m_poll(struct target
*target
)
490 int detected_failure
= ERROR_OK
;
491 int retval
= ERROR_OK
;
492 enum target_state prev_target_state
= target
->state
;
493 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
494 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
496 /* Read from Debug Halting Control and Status Register */
497 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
498 if (retval
!= ERROR_OK
) {
499 target
->state
= TARGET_UNKNOWN
;
503 /* Recover from lockup. See ARMv7-M architecture spec,
504 * section B1.5.15 "Unrecoverable exception cases".
506 if (cortex_m
->dcb_dhcsr
& S_LOCKUP
) {
507 LOG_ERROR("%s -- clearing lockup after double fault",
508 target_name(target
));
509 cortex_m_write_debug_halt_mask(target
, C_HALT
, 0);
510 target
->debug_reason
= DBG_REASON_DBGRQ
;
512 /* We have to execute the rest (the "finally" equivalent, but
513 * still throw this exception again).
515 detected_failure
= ERROR_FAIL
;
517 /* refresh status bits */
518 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
519 if (retval
!= ERROR_OK
)
523 if (cortex_m
->dcb_dhcsr
& S_RESET_ST
) {
524 target
->state
= TARGET_RESET
;
528 if (target
->state
== TARGET_RESET
) {
529 /* Cannot switch context while running so endreset is
530 * called with target->state == TARGET_RESET
532 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%" PRIx32
,
533 cortex_m
->dcb_dhcsr
);
534 retval
= cortex_m_endreset_event(target
);
535 if (retval
!= ERROR_OK
) {
536 target
->state
= TARGET_UNKNOWN
;
539 target
->state
= TARGET_RUNNING
;
540 prev_target_state
= TARGET_RUNNING
;
543 if (cortex_m
->dcb_dhcsr
& S_HALT
) {
544 target
->state
= TARGET_HALTED
;
546 if ((prev_target_state
== TARGET_RUNNING
) || (prev_target_state
== TARGET_RESET
)) {
547 retval
= cortex_m_debug_entry(target
);
548 if (retval
!= ERROR_OK
)
551 if (arm_semihosting(target
, &retval
) != 0)
554 target_call_event_callbacks(target
, TARGET_EVENT_HALTED
);
556 if (prev_target_state
== TARGET_DEBUG_RUNNING
) {
558 retval
= cortex_m_debug_entry(target
);
559 if (retval
!= ERROR_OK
)
562 target_call_event_callbacks(target
, TARGET_EVENT_DEBUG_HALTED
);
566 /* REVISIT when S_SLEEP is set, it's in a Sleep or DeepSleep state.
567 * How best to model low power modes?
570 if (target
->state
== TARGET_UNKNOWN
) {
571 /* check if processor is retiring instructions */
572 if (cortex_m
->dcb_dhcsr
& S_RETIRE_ST
) {
573 target
->state
= TARGET_RUNNING
;
578 /* Did we detect a failure condition that we cleared? */
579 if (detected_failure
!= ERROR_OK
)
580 retval
= detected_failure
;
584 static int cortex_m_halt(struct target
*target
)
586 LOG_DEBUG("target->state: %s",
587 target_state_name(target
));
589 if (target
->state
== TARGET_HALTED
) {
590 LOG_DEBUG("target was already halted");
594 if (target
->state
== TARGET_UNKNOWN
)
595 LOG_WARNING("target was in unknown state when halt was requested");
597 if (target
->state
== TARGET_RESET
) {
598 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST
) && jtag_get_srst()) {
599 LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
600 return ERROR_TARGET_FAILURE
;
602 /* we came here in a reset_halt or reset_init sequence
603 * debug entry was already prepared in cortex_m3_assert_reset()
605 target
->debug_reason
= DBG_REASON_DBGRQ
;
611 /* Write to Debug Halting Control and Status Register */
612 cortex_m_write_debug_halt_mask(target
, C_HALT
, 0);
614 target
->debug_reason
= DBG_REASON_DBGRQ
;
619 static int cortex_m_soft_reset_halt(struct target
*target
)
621 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
622 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
623 uint32_t dcb_dhcsr
= 0;
624 int retval
, timeout
= 0;
626 /* soft_reset_halt is deprecated on cortex_m as the same functionality
627 * can be obtained by using 'reset halt' and 'cortex_m reset_config vectreset'
628 * As this reset only used VC_CORERESET it would only ever reset the cortex_m
629 * core, not the peripherals */
630 LOG_WARNING("soft_reset_halt is deprecated, please use 'reset halt' instead.");
632 /* Enter debug state on reset; restore DEMCR in endreset_event() */
633 retval
= mem_ap_write_u32(swjdp
, DCB_DEMCR
,
634 TRCENA
| VC_HARDERR
| VC_BUSERR
| VC_CORERESET
);
635 if (retval
!= ERROR_OK
)
638 /* Request a core-only reset */
639 retval
= mem_ap_write_atomic_u32(swjdp
, NVIC_AIRCR
,
640 AIRCR_VECTKEY
| AIRCR_VECTRESET
);
641 if (retval
!= ERROR_OK
)
643 target
->state
= TARGET_RESET
;
645 /* registers are now invalid */
646 register_cache_invalidate(cortex_m
->armv7m
.arm
.core_cache
);
648 while (timeout
< 100) {
649 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DHCSR
, &dcb_dhcsr
);
650 if (retval
== ERROR_OK
) {
651 retval
= mem_ap_read_atomic_u32(swjdp
, NVIC_DFSR
,
652 &cortex_m
->nvic_dfsr
);
653 if (retval
!= ERROR_OK
)
655 if ((dcb_dhcsr
& S_HALT
)
656 && (cortex_m
->nvic_dfsr
& DFSR_VCATCH
)) {
657 LOG_DEBUG("system reset-halted, DHCSR 0x%08x, "
659 (unsigned) dcb_dhcsr
,
660 (unsigned) cortex_m
->nvic_dfsr
);
661 cortex_m_poll(target
);
662 /* FIXME restore user's vector catch config */
665 LOG_DEBUG("waiting for system reset-halt, "
666 "DHCSR 0x%08x, %d ms",
667 (unsigned) dcb_dhcsr
, timeout
);
676 void cortex_m_enable_breakpoints(struct target
*target
)
678 struct breakpoint
*breakpoint
= target
->breakpoints
;
680 /* set any pending breakpoints */
682 if (!breakpoint
->set
)
683 cortex_m_set_breakpoint(target
, breakpoint
);
684 breakpoint
= breakpoint
->next
;
688 static int cortex_m_resume(struct target
*target
, int current
,
689 uint32_t address
, int handle_breakpoints
, int debug_execution
)
691 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
692 struct breakpoint
*breakpoint
= NULL
;
696 if (target
->state
!= TARGET_HALTED
) {
697 LOG_WARNING("target not halted");
698 return ERROR_TARGET_NOT_HALTED
;
701 if (!debug_execution
) {
702 target_free_all_working_areas(target
);
703 cortex_m_enable_breakpoints(target
);
704 cortex_m_enable_watchpoints(target
);
707 if (debug_execution
) {
708 r
= armv7m
->arm
.core_cache
->reg_list
+ ARMV7M_PRIMASK
;
710 /* Disable interrupts */
711 /* We disable interrupts in the PRIMASK register instead of
712 * masking with C_MASKINTS. This is probably the same issue
713 * as Cortex-M3 Erratum 377493 (fixed in r1p0): C_MASKINTS
714 * in parallel with disabled interrupts can cause local faults
717 * REVISIT this clearly breaks non-debug execution, since the
718 * PRIMASK register state isn't saved/restored... workaround
719 * by never resuming app code after debug execution.
721 buf_set_u32(r
->value
, 0, 1, 1);
725 /* Make sure we are in Thumb mode */
726 r
= armv7m
->arm
.cpsr
;
727 buf_set_u32(r
->value
, 24, 1, 1);
732 /* current = 1: continue on current pc, otherwise continue at <address> */
735 buf_set_u32(r
->value
, 0, 32, address
);
740 /* if we halted last time due to a bkpt instruction
741 * then we have to manually step over it, otherwise
742 * the core will break again */
744 if (!breakpoint_find(target
, buf_get_u32(r
->value
, 0, 32))
746 armv7m_maybe_skip_bkpt_inst(target
, NULL
);
748 resume_pc
= buf_get_u32(r
->value
, 0, 32);
750 armv7m_restore_context(target
);
752 /* the front-end may request us not to handle breakpoints */
753 if (handle_breakpoints
) {
754 /* Single step past breakpoint at current address */
755 breakpoint
= breakpoint_find(target
, resume_pc
);
757 LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32
" (ID: %" PRIu32
")",
759 breakpoint
->unique_id
);
760 cortex_m_unset_breakpoint(target
, breakpoint
);
761 cortex_m_single_step_core(target
);
762 cortex_m_set_breakpoint(target
, breakpoint
);
767 cortex_m_write_debug_halt_mask(target
, 0, C_HALT
);
769 target
->debug_reason
= DBG_REASON_NOTHALTED
;
771 /* registers are now invalid */
772 register_cache_invalidate(armv7m
->arm
.core_cache
);
774 if (!debug_execution
) {
775 target
->state
= TARGET_RUNNING
;
776 target_call_event_callbacks(target
, TARGET_EVENT_RESUMED
);
777 LOG_DEBUG("target resumed at 0x%" PRIx32
"", resume_pc
);
779 target
->state
= TARGET_DEBUG_RUNNING
;
780 target_call_event_callbacks(target
, TARGET_EVENT_DEBUG_RESUMED
);
781 LOG_DEBUG("target debug resumed at 0x%" PRIx32
"", resume_pc
);
787 /* int irqstepcount = 0; */
788 static int cortex_m_step(struct target
*target
, int current
,
789 uint32_t address
, int handle_breakpoints
)
791 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
792 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
793 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
794 struct breakpoint
*breakpoint
= NULL
;
795 struct reg
*pc
= armv7m
->arm
.pc
;
796 bool bkpt_inst_found
= false;
798 bool isr_timed_out
= false;
800 if (target
->state
!= TARGET_HALTED
) {
801 LOG_WARNING("target not halted");
802 return ERROR_TARGET_NOT_HALTED
;
805 /* current = 1: continue on current pc, otherwise continue at <address> */
807 buf_set_u32(pc
->value
, 0, 32, address
);
809 uint32_t pc_value
= buf_get_u32(pc
->value
, 0, 32);
811 /* the front-end may request us not to handle breakpoints */
812 if (handle_breakpoints
) {
813 breakpoint
= breakpoint_find(target
, pc_value
);
815 cortex_m_unset_breakpoint(target
, breakpoint
);
818 armv7m_maybe_skip_bkpt_inst(target
, &bkpt_inst_found
);
820 target
->debug_reason
= DBG_REASON_SINGLESTEP
;
822 armv7m_restore_context(target
);
824 target_call_event_callbacks(target
, TARGET_EVENT_RESUMED
);
826 /* if no bkpt instruction is found at pc then we can perform
827 * a normal step, otherwise we have to manually step over the bkpt
828 * instruction - as such simulate a step */
829 if (bkpt_inst_found
== false) {
830 /* Automatic ISR masking mode off: Just step over the next instruction */
831 if ((cortex_m
->isrmasking_mode
!= CORTEX_M_ISRMASK_AUTO
))
832 cortex_m_write_debug_halt_mask(target
, C_STEP
, C_HALT
);
834 /* Process interrupts during stepping in a way they don't interfere
839 * Set a temporary break point at the current pc and let the core run
840 * with interrupts enabled. Pending interrupts get served and we run
841 * into the breakpoint again afterwards. Then we step over the next
842 * instruction with interrupts disabled.
844 * If the pending interrupts don't complete within time, we leave the
845 * core running. This may happen if the interrupts trigger faster
846 * than the core can process them or the handler doesn't return.
848 * If no more breakpoints are available we simply do a step with
849 * interrupts enabled.
855 * If a break point is already set on the lower half word then a break point on
856 * the upper half word will not break again when the core is restarted. So we
857 * just step over the instruction with interrupts disabled.
859 * The documentation has no information about this, it was found by observation
860 * on STM32F1 and STM32F2. Proper explanation welcome. STM32F0 dosen't seem to
861 * suffer from this problem.
863 * To add some confusion: pc_value has bit 0 always set, while the breakpoint
864 * address has it always cleared. The former is done to indicate thumb mode
868 if ((pc_value
& 0x02) && breakpoint_find(target
, pc_value
& ~0x03)) {
869 LOG_DEBUG("Stepping over next instruction with interrupts disabled");
870 cortex_m_write_debug_halt_mask(target
, C_HALT
| C_MASKINTS
, 0);
871 cortex_m_write_debug_halt_mask(target
, C_STEP
, C_HALT
);
872 /* Re-enable interrupts */
873 cortex_m_write_debug_halt_mask(target
, C_HALT
, C_MASKINTS
);
877 /* Set a temporary break point */
879 retval
= cortex_m_set_breakpoint(target
, breakpoint
);
881 retval
= breakpoint_add(target
, pc_value
, 2, BKPT_TYPE_BY_ADDR(pc_value
));
882 bool tmp_bp_set
= (retval
== ERROR_OK
);
884 /* No more breakpoints left, just do a step */
886 cortex_m_write_debug_halt_mask(target
, C_STEP
, C_HALT
);
889 LOG_DEBUG("Starting core to serve pending interrupts");
890 int64_t t_start
= timeval_ms();
891 cortex_m_write_debug_halt_mask(target
, 0, C_HALT
| C_STEP
);
893 /* Wait for pending handlers to complete or timeout */
895 retval
= mem_ap_read_atomic_u32(swjdp
,
897 &cortex_m
->dcb_dhcsr
);
898 if (retval
!= ERROR_OK
) {
899 target
->state
= TARGET_UNKNOWN
;
902 isr_timed_out
= ((timeval_ms() - t_start
) > 500);
903 } while (!((cortex_m
->dcb_dhcsr
& S_HALT
) || isr_timed_out
));
905 /* only remove breakpoint if we created it */
907 cortex_m_unset_breakpoint(target
, breakpoint
);
909 /* Remove the temporary breakpoint */
910 breakpoint_remove(target
, pc_value
);
914 LOG_DEBUG("Interrupt handlers didn't complete within time, "
915 "leaving target running");
917 /* Step over next instruction with interrupts disabled */
918 cortex_m_write_debug_halt_mask(target
,
921 cortex_m_write_debug_halt_mask(target
, C_STEP
, C_HALT
);
922 /* Re-enable interrupts */
923 cortex_m_write_debug_halt_mask(target
, C_HALT
, C_MASKINTS
);
930 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
931 if (retval
!= ERROR_OK
)
934 /* registers are now invalid */
935 register_cache_invalidate(armv7m
->arm
.core_cache
);
938 cortex_m_set_breakpoint(target
, breakpoint
);
941 /* Leave the core running. The user has to stop execution manually. */
942 target
->debug_reason
= DBG_REASON_NOTHALTED
;
943 target
->state
= TARGET_RUNNING
;
947 LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
948 " nvic_icsr = 0x%" PRIx32
,
949 cortex_m
->dcb_dhcsr
, cortex_m
->nvic_icsr
);
951 retval
= cortex_m_debug_entry(target
);
952 if (retval
!= ERROR_OK
)
954 target_call_event_callbacks(target
, TARGET_EVENT_HALTED
);
956 LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
957 " nvic_icsr = 0x%" PRIx32
,
958 cortex_m
->dcb_dhcsr
, cortex_m
->nvic_icsr
);
963 static int cortex_m_assert_reset(struct target
*target
)
965 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
966 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
967 enum cortex_m_soft_reset_config reset_config
= cortex_m
->soft_reset_config
;
969 LOG_DEBUG("target->state: %s",
970 target_state_name(target
));
972 enum reset_types jtag_reset_config
= jtag_get_reset_config();
974 if (target_has_event_action(target
, TARGET_EVENT_RESET_ASSERT
)) {
975 /* allow scripts to override the reset event */
977 target_handle_event(target
, TARGET_EVENT_RESET_ASSERT
);
978 register_cache_invalidate(cortex_m
->armv7m
.arm
.core_cache
);
979 target
->state
= TARGET_RESET
;
984 /* some cores support connecting while srst is asserted
985 * use that mode is it has been configured */
987 bool srst_asserted
= false;
989 if ((jtag_reset_config
& RESET_HAS_SRST
) &&
990 (jtag_reset_config
& RESET_SRST_NO_GATING
)) {
991 adapter_assert_reset();
992 srst_asserted
= true;
995 /* Enable debug requests */
997 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
998 if (retval
!= ERROR_OK
)
1000 if (!(cortex_m
->dcb_dhcsr
& C_DEBUGEN
)) {
1001 retval
= mem_ap_write_u32(swjdp
, DCB_DHCSR
, DBGKEY
| C_DEBUGEN
);
1002 if (retval
!= ERROR_OK
)
1006 /* If the processor is sleeping in a WFI or WFE instruction, the
1007 * C_HALT bit must be asserted to regain control */
1008 if (cortex_m
->dcb_dhcsr
& S_SLEEP
) {
1009 retval
= mem_ap_write_u32(swjdp
, DCB_DHCSR
, DBGKEY
| C_HALT
| C_DEBUGEN
);
1010 if (retval
!= ERROR_OK
)
1014 retval
= mem_ap_write_u32(swjdp
, DCB_DCRDR
, 0);
1015 if (retval
!= ERROR_OK
)
1018 if (!target
->reset_halt
) {
1019 /* Set/Clear C_MASKINTS in a separate operation */
1020 if (cortex_m
->dcb_dhcsr
& C_MASKINTS
) {
1021 retval
= mem_ap_write_atomic_u32(swjdp
, DCB_DHCSR
,
1022 DBGKEY
| C_DEBUGEN
| C_HALT
);
1023 if (retval
!= ERROR_OK
)
1027 /* clear any debug flags before resuming */
1028 cortex_m_clear_halt(target
);
1030 /* clear C_HALT in dhcsr reg */
1031 cortex_m_write_debug_halt_mask(target
, 0, C_HALT
);
1033 /* Halt in debug on reset; endreset_event() restores DEMCR.
1035 * REVISIT catching BUSERR presumably helps to defend against
1036 * bad vector table entries. Should this include MMERR or
1039 retval
= mem_ap_write_atomic_u32(swjdp
, DCB_DEMCR
,
1040 TRCENA
| VC_HARDERR
| VC_BUSERR
| VC_CORERESET
);
1041 if (retval
!= ERROR_OK
)
1045 if (jtag_reset_config
& RESET_HAS_SRST
) {
1046 /* default to asserting srst */
1048 adapter_assert_reset();
1050 /* Use a standard Cortex-M3 software reset mechanism.
1051 * We default to using VECRESET as it is supported on all current cores.
1052 * This has the disadvantage of not resetting the peripherals, so a
1053 * reset-init event handler is needed to perform any peripheral resets.
1055 retval
= mem_ap_write_atomic_u32(swjdp
, NVIC_AIRCR
,
1056 AIRCR_VECTKEY
| ((reset_config
== CORTEX_M_RESET_SYSRESETREQ
)
1057 ? AIRCR_SYSRESETREQ
: AIRCR_VECTRESET
));
1058 if (retval
!= ERROR_OK
)
1061 LOG_DEBUG("Using Cortex-M %s", (reset_config
== CORTEX_M_RESET_SYSRESETREQ
)
1062 ? "SYSRESETREQ" : "VECTRESET");
1064 if (reset_config
== CORTEX_M_RESET_VECTRESET
) {
1065 LOG_WARNING("Only resetting the Cortex-M core, use a reset-init event "
1066 "handler to reset any peripherals or configure hardware srst support.");
1070 SAM4L needs to execute security initalization
1071 startup sequence before AP access would be enabled.
1072 During the intialization CDBGPWRUPACK is pulled low and we
1073 need to wait for it to be set to 1 again.
1075 retval
= dap_dp_poll_register(swjdp
, DP_CTRL_STAT
,
1076 CDBGPWRUPACK
, CDBGPWRUPACK
, 100);
1077 if (retval
!= ERROR_OK
) {
1078 LOG_ERROR("Failed waitnig for CDBGPWRUPACK");
1083 /* I do not know why this is necessary, but it
1084 * fixes strange effects (step/resume cause NMI
1085 * after reset) on LM3S6918 -- Michael Schwingen
1088 retval
= mem_ap_read_atomic_u32(swjdp
, NVIC_AIRCR
, &tmp
);
1089 if (retval
!= ERROR_OK
)
1094 target
->state
= TARGET_RESET
;
1095 jtag_add_sleep(50000);
1097 register_cache_invalidate(cortex_m
->armv7m
.arm
.core_cache
);
1099 if (target
->reset_halt
) {
1100 retval
= target_halt(target
);
1101 if (retval
!= ERROR_OK
)
1108 static int cortex_m_deassert_reset(struct target
*target
)
1110 LOG_DEBUG("target->state: %s",
1111 target_state_name(target
));
1113 /* deassert reset lines */
1114 adapter_deassert_reset();
1119 int cortex_m_set_breakpoint(struct target
*target
, struct breakpoint
*breakpoint
)
1124 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1125 struct cortex_m_fp_comparator
*comparator_list
= cortex_m
->fp_comparator_list
;
1127 if (breakpoint
->set
) {
1128 LOG_WARNING("breakpoint (BPID: %" PRIu32
") already set", breakpoint
->unique_id
);
1132 if (cortex_m
->auto_bp_type
)
1133 breakpoint
->type
= BKPT_TYPE_BY_ADDR(breakpoint
->address
);
1135 if (breakpoint
->type
== BKPT_HARD
) {
1136 while (comparator_list
[fp_num
].used
&& (fp_num
< cortex_m
->fp_num_code
))
1138 if (fp_num
>= cortex_m
->fp_num_code
) {
1139 LOG_ERROR("Can not find free FPB Comparator!");
1142 breakpoint
->set
= fp_num
+ 1;
1143 hilo
= (breakpoint
->address
& 0x2) ? FPCR_REPLACE_BKPT_HIGH
: FPCR_REPLACE_BKPT_LOW
;
1144 comparator_list
[fp_num
].used
= 1;
1145 comparator_list
[fp_num
].fpcr_value
= (breakpoint
->address
& 0x1FFFFFFC) | hilo
| 1;
1146 target_write_u32(target
, comparator_list
[fp_num
].fpcr_address
,
1147 comparator_list
[fp_num
].fpcr_value
);
1148 LOG_DEBUG("fpc_num %i fpcr_value 0x%" PRIx32
"",
1150 comparator_list
[fp_num
].fpcr_value
);
1151 if (!cortex_m
->fpb_enabled
) {
1152 LOG_DEBUG("FPB wasn't enabled, do it now");
1153 retval
= cortex_m_enable_fpb(target
);
1154 if (retval
!= ERROR_OK
) {
1155 LOG_ERROR("Failed to enable the FPB");
1159 cortex_m
->fpb_enabled
= 1;
1161 } else if (breakpoint
->type
== BKPT_SOFT
) {
1164 /* NOTE: on ARMv6-M and ARMv7-M, BKPT(0xab) is used for
1165 * semihosting; don't use that. Otherwise the BKPT
1166 * parameter is arbitrary.
1168 buf_set_u32(code
, 0, 32, ARMV5_T_BKPT(0x11));
1169 retval
= target_read_memory(target
,
1170 breakpoint
->address
& 0xFFFFFFFE,
1171 breakpoint
->length
, 1,
1172 breakpoint
->orig_instr
);
1173 if (retval
!= ERROR_OK
)
1175 retval
= target_write_memory(target
,
1176 breakpoint
->address
& 0xFFFFFFFE,
1177 breakpoint
->length
, 1,
1179 if (retval
!= ERROR_OK
)
1181 breakpoint
->set
= true;
1184 LOG_DEBUG("BPID: %" PRIu32
", Type: %d, Address: 0x%08" PRIx32
" Length: %d (set=%d)",
1185 breakpoint
->unique_id
,
1186 (int)(breakpoint
->type
),
1187 breakpoint
->address
,
1194 int cortex_m_unset_breakpoint(struct target
*target
, struct breakpoint
*breakpoint
)
1197 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1198 struct cortex_m_fp_comparator
*comparator_list
= cortex_m
->fp_comparator_list
;
1200 if (!breakpoint
->set
) {
1201 LOG_WARNING("breakpoint not set");
1205 LOG_DEBUG("BPID: %" PRIu32
", Type: %d, Address: 0x%08" PRIx32
" Length: %d (set=%d)",
1206 breakpoint
->unique_id
,
1207 (int)(breakpoint
->type
),
1208 breakpoint
->address
,
1212 if (breakpoint
->type
== BKPT_HARD
) {
1213 int fp_num
= breakpoint
->set
- 1;
1214 if ((fp_num
< 0) || (fp_num
>= cortex_m
->fp_num_code
)) {
1215 LOG_DEBUG("Invalid FP Comparator number in breakpoint");
1218 comparator_list
[fp_num
].used
= 0;
1219 comparator_list
[fp_num
].fpcr_value
= 0;
1220 target_write_u32(target
, comparator_list
[fp_num
].fpcr_address
,
1221 comparator_list
[fp_num
].fpcr_value
);
1223 /* restore original instruction (kept in target endianness) */
1224 if (breakpoint
->length
== 4) {
1225 retval
= target_write_memory(target
, breakpoint
->address
& 0xFFFFFFFE, 4, 1,
1226 breakpoint
->orig_instr
);
1227 if (retval
!= ERROR_OK
)
1230 retval
= target_write_memory(target
, breakpoint
->address
& 0xFFFFFFFE, 2, 1,
1231 breakpoint
->orig_instr
);
1232 if (retval
!= ERROR_OK
)
1236 breakpoint
->set
= false;
1241 int cortex_m_add_breakpoint(struct target
*target
, struct breakpoint
*breakpoint
)
1243 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1245 if (cortex_m
->auto_bp_type
)
1246 breakpoint
->type
= BKPT_TYPE_BY_ADDR(breakpoint
->address
);
1248 if (breakpoint
->type
!= BKPT_TYPE_BY_ADDR(breakpoint
->address
)) {
1249 if (breakpoint
->type
== BKPT_HARD
) {
1250 LOG_INFO("flash patch comparator requested outside code memory region");
1251 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1254 if (breakpoint
->type
== BKPT_SOFT
) {
1255 LOG_INFO("soft breakpoint requested in code (flash) memory region");
1256 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1260 if ((breakpoint
->type
== BKPT_HARD
) && (cortex_m
->fp_code_available
< 1)) {
1261 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
1262 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1265 if (breakpoint
->length
== 3) {
1266 LOG_DEBUG("Using a two byte breakpoint for 32bit Thumb-2 request");
1267 breakpoint
->length
= 2;
1270 if ((breakpoint
->length
!= 2)) {
1271 LOG_INFO("only breakpoints of two bytes length supported");
1272 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1275 if (breakpoint
->type
== BKPT_HARD
)
1276 cortex_m
->fp_code_available
--;
1278 return cortex_m_set_breakpoint(target
, breakpoint
);
1281 int cortex_m_remove_breakpoint(struct target
*target
, struct breakpoint
*breakpoint
)
1283 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1285 /* REVISIT why check? FBP can be updated with core running ... */
1286 if (target
->state
!= TARGET_HALTED
) {
1287 LOG_WARNING("target not halted");
1288 return ERROR_TARGET_NOT_HALTED
;
1291 if (cortex_m
->auto_bp_type
)
1292 breakpoint
->type
= BKPT_TYPE_BY_ADDR(breakpoint
->address
);
1294 if (breakpoint
->set
)
1295 cortex_m_unset_breakpoint(target
, breakpoint
);
1297 if (breakpoint
->type
== BKPT_HARD
)
1298 cortex_m
->fp_code_available
++;
1303 int cortex_m_set_watchpoint(struct target
*target
, struct watchpoint
*watchpoint
)
1306 uint32_t mask
, temp
;
1307 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1309 /* watchpoint params were validated earlier */
1311 temp
= watchpoint
->length
;
1318 /* REVISIT Don't fully trust these "not used" records ... users
1319 * may set up breakpoints by hand, e.g. dual-address data value
1320 * watchpoint using comparator #1; comparator #0 matching cycle
1321 * count; send data trace info through ITM and TPIU; etc
1323 struct cortex_m_dwt_comparator
*comparator
;
1325 for (comparator
= cortex_m
->dwt_comparator_list
;
1326 comparator
->used
&& dwt_num
< cortex_m
->dwt_num_comp
;
1327 comparator
++, dwt_num
++)
1329 if (dwt_num
>= cortex_m
->dwt_num_comp
) {
1330 LOG_ERROR("Can not find free DWT Comparator");
1333 comparator
->used
= 1;
1334 watchpoint
->set
= dwt_num
+ 1;
1336 comparator
->comp
= watchpoint
->address
;
1337 target_write_u32(target
, comparator
->dwt_comparator_address
+ 0,
1340 comparator
->mask
= mask
;
1341 target_write_u32(target
, comparator
->dwt_comparator_address
+ 4,
1344 switch (watchpoint
->rw
) {
1346 comparator
->function
= 5;
1349 comparator
->function
= 6;
1352 comparator
->function
= 7;
1355 target_write_u32(target
, comparator
->dwt_comparator_address
+ 8,
1356 comparator
->function
);
1358 LOG_DEBUG("Watchpoint (ID %d) DWT%d 0x%08x 0x%x 0x%05x",
1359 watchpoint
->unique_id
, dwt_num
,
1360 (unsigned) comparator
->comp
,
1361 (unsigned) comparator
->mask
,
1362 (unsigned) comparator
->function
);
1366 int cortex_m_unset_watchpoint(struct target
*target
, struct watchpoint
*watchpoint
)
1368 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1369 struct cortex_m_dwt_comparator
*comparator
;
1372 if (!watchpoint
->set
) {
1373 LOG_WARNING("watchpoint (wpid: %d) not set",
1374 watchpoint
->unique_id
);
1378 dwt_num
= watchpoint
->set
- 1;
1380 LOG_DEBUG("Watchpoint (ID %d) DWT%d address: 0x%08x clear",
1381 watchpoint
->unique_id
, dwt_num
,
1382 (unsigned) watchpoint
->address
);
1384 if ((dwt_num
< 0) || (dwt_num
>= cortex_m
->dwt_num_comp
)) {
1385 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1389 comparator
= cortex_m
->dwt_comparator_list
+ dwt_num
;
1390 comparator
->used
= 0;
1391 comparator
->function
= 0;
1392 target_write_u32(target
, comparator
->dwt_comparator_address
+ 8,
1393 comparator
->function
);
1395 watchpoint
->set
= false;
1400 int cortex_m_add_watchpoint(struct target
*target
, struct watchpoint
*watchpoint
)
1402 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1404 if (cortex_m
->dwt_comp_available
< 1) {
1405 LOG_DEBUG("no comparators?");
1406 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1409 /* hardware doesn't support data value masking */
1410 if (watchpoint
->mask
!= ~(uint32_t)0) {
1411 LOG_DEBUG("watchpoint value masks not supported");
1412 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1415 /* hardware allows address masks of up to 32K */
1418 for (mask
= 0; mask
< 16; mask
++) {
1419 if ((1u << mask
) == watchpoint
->length
)
1423 LOG_DEBUG("unsupported watchpoint length");
1424 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1426 if (watchpoint
->address
& ((1 << mask
) - 1)) {
1427 LOG_DEBUG("watchpoint address is unaligned");
1428 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1431 /* Caller doesn't seem to be able to describe watching for data
1432 * values of zero; that flags "no value".
1434 * REVISIT This DWT may well be able to watch for specific data
1435 * values. Requires comparator #1 to set DATAVMATCH and match
1436 * the data, and another comparator (DATAVADDR0) matching addr.
1438 if (watchpoint
->value
) {
1439 LOG_DEBUG("data value watchpoint not YET supported");
1440 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1443 cortex_m
->dwt_comp_available
--;
1444 LOG_DEBUG("dwt_comp_available: %d", cortex_m
->dwt_comp_available
);
1449 int cortex_m_remove_watchpoint(struct target
*target
, struct watchpoint
*watchpoint
)
1451 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1453 /* REVISIT why check? DWT can be updated with core running ... */
1454 if (target
->state
!= TARGET_HALTED
) {
1455 LOG_WARNING("target not halted");
1456 return ERROR_TARGET_NOT_HALTED
;
1459 if (watchpoint
->set
)
1460 cortex_m_unset_watchpoint(target
, watchpoint
);
1462 cortex_m
->dwt_comp_available
++;
1463 LOG_DEBUG("dwt_comp_available: %d", cortex_m
->dwt_comp_available
);
1468 void cortex_m_enable_watchpoints(struct target
*target
)
1470 struct watchpoint
*watchpoint
= target
->watchpoints
;
1472 /* set any pending watchpoints */
1473 while (watchpoint
) {
1474 if (!watchpoint
->set
)
1475 cortex_m_set_watchpoint(target
, watchpoint
);
1476 watchpoint
= watchpoint
->next
;
1480 static int cortex_m_load_core_reg_u32(struct target
*target
,
1481 uint32_t num
, uint32_t *value
)
1485 /* NOTE: we "know" here that the register identifiers used
1486 * in the v7m header match the Cortex-M3 Debug Core Register
1487 * Selector values for R0..R15, xPSR, MSP, and PSP.
1491 /* read a normal core register */
1492 retval
= cortexm_dap_read_coreregister_u32(target
, value
, num
);
1494 if (retval
!= ERROR_OK
) {
1495 LOG_ERROR("JTAG failure %i", retval
);
1496 return ERROR_JTAG_DEVICE_ERROR
;
1498 LOG_DEBUG("load from core reg %i value 0x%" PRIx32
"", (int)num
, *value
);
1501 case ARMV7M_PRIMASK
:
1502 case ARMV7M_BASEPRI
:
1503 case ARMV7M_FAULTMASK
:
1504 case ARMV7M_CONTROL
:
1505 /* Cortex-M3 packages these four registers as bitfields
1506 * in one Debug Core register. So say r0 and r2 docs;
1507 * it was removed from r1 docs, but still works.
1509 cortexm_dap_read_coreregister_u32(target
, value
, 20);
1512 case ARMV7M_PRIMASK
:
1513 *value
= buf_get_u32((uint8_t *)value
, 0, 1);
1516 case ARMV7M_BASEPRI
:
1517 *value
= buf_get_u32((uint8_t *)value
, 8, 8);
1520 case ARMV7M_FAULTMASK
:
1521 *value
= buf_get_u32((uint8_t *)value
, 16, 1);
1524 case ARMV7M_CONTROL
:
1525 *value
= buf_get_u32((uint8_t *)value
, 24, 2);
1529 LOG_DEBUG("load from special reg %i value 0x%" PRIx32
"", (int)num
, *value
);
1533 return ERROR_COMMAND_SYNTAX_ERROR
;
1539 static int cortex_m_store_core_reg_u32(struct target
*target
,
1540 uint32_t num
, uint32_t value
)
1544 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1546 /* NOTE: we "know" here that the register identifiers used
1547 * in the v7m header match the Cortex-M3 Debug Core Register
1548 * Selector values for R0..R15, xPSR, MSP, and PSP.
1552 retval
= cortexm_dap_write_coreregister_u32(target
, value
, num
);
1553 if (retval
!= ERROR_OK
) {
1556 LOG_ERROR("JTAG failure");
1557 r
= armv7m
->arm
.core_cache
->reg_list
+ num
;
1558 r
->dirty
= r
->valid
;
1559 return ERROR_JTAG_DEVICE_ERROR
;
1561 LOG_DEBUG("write core reg %i value 0x%" PRIx32
"", (int)num
, value
);
1564 case ARMV7M_PRIMASK
:
1565 case ARMV7M_BASEPRI
:
1566 case ARMV7M_FAULTMASK
:
1567 case ARMV7M_CONTROL
:
1568 /* Cortex-M3 packages these four registers as bitfields
1569 * in one Debug Core register. So say r0 and r2 docs;
1570 * it was removed from r1 docs, but still works.
1572 cortexm_dap_read_coreregister_u32(target
, ®
, 20);
1575 case ARMV7M_PRIMASK
:
1576 buf_set_u32((uint8_t *)®
, 0, 1, value
);
1579 case ARMV7M_BASEPRI
:
1580 buf_set_u32((uint8_t *)®
, 8, 8, value
);
1583 case ARMV7M_FAULTMASK
:
1584 buf_set_u32((uint8_t *)®
, 16, 1, value
);
1587 case ARMV7M_CONTROL
:
1588 buf_set_u32((uint8_t *)®
, 24, 2, value
);
1592 cortexm_dap_write_coreregister_u32(target
, reg
, 20);
1594 LOG_DEBUG("write special reg %i value 0x%" PRIx32
" ", (int)num
, value
);
1598 return ERROR_COMMAND_SYNTAX_ERROR
;
1604 static int cortex_m_read_memory(struct target
*target
, uint32_t address
,
1605 uint32_t size
, uint32_t count
, uint8_t *buffer
)
1607 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1608 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
1610 if (armv7m
->arm
.is_armv6m
) {
1611 /* armv6m does not handle unaligned memory access */
1612 if (((size
== 4) && (address
& 0x3u
)) || ((size
== 2) && (address
& 0x1u
)))
1613 return ERROR_TARGET_UNALIGNED_ACCESS
;
1616 return mem_ap_read(swjdp
, buffer
, size
, count
, address
, true);
1619 static int cortex_m_write_memory(struct target
*target
, uint32_t address
,
1620 uint32_t size
, uint32_t count
, const uint8_t *buffer
)
1622 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1623 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
1625 if (armv7m
->arm
.is_armv6m
) {
1626 /* armv6m does not handle unaligned memory access */
1627 if (((size
== 4) && (address
& 0x3u
)) || ((size
== 2) && (address
& 0x1u
)))
1628 return ERROR_TARGET_UNALIGNED_ACCESS
;
1631 return mem_ap_write(swjdp
, buffer
, size
, count
, address
, true);
1634 static int cortex_m_init_target(struct command_context
*cmd_ctx
,
1635 struct target
*target
)
1637 armv7m_build_reg_cache(target
);
1641 /* REVISIT cache valid/dirty bits are unmaintained. We could set "valid"
1642 * on r/w if the core is not running, and clear on resume or reset ... or
1643 * at least, in a post_restore_context() method.
1646 struct dwt_reg_state
{
1647 struct target
*target
;
1649 uint32_t value
; /* scratch/cache */
1652 static int cortex_m_dwt_get_reg(struct reg
*reg
)
1654 struct dwt_reg_state
*state
= reg
->arch_info
;
1656 return target_read_u32(state
->target
, state
->addr
, &state
->value
);
1659 static int cortex_m_dwt_set_reg(struct reg
*reg
, uint8_t *buf
)
1661 struct dwt_reg_state
*state
= reg
->arch_info
;
1663 return target_write_u32(state
->target
, state
->addr
,
1664 buf_get_u32(buf
, 0, reg
->size
));
1673 static struct dwt_reg dwt_base_regs
[] = {
1674 { DWT_CTRL
, "dwt_ctrl", 32, },
1675 /* NOTE that Erratum 532314 (fixed r2p0) affects CYCCNT: it wrongly
1676 * increments while the core is asleep.
1678 { DWT_CYCCNT
, "dwt_cyccnt", 32, },
1679 /* plus some 8 bit counters, useful for profiling with TPIU */
1682 static struct dwt_reg dwt_comp
[] = {
1683 #define DWT_COMPARATOR(i) \
1684 { DWT_COMP0 + 0x10 * (i), "dwt_" #i "_comp", 32, }, \
1685 { DWT_MASK0 + 0x10 * (i), "dwt_" #i "_mask", 4, }, \
1686 { DWT_FUNCTION0 + 0x10 * (i), "dwt_" #i "_function", 32, }
1691 #undef DWT_COMPARATOR
1694 static const struct reg_arch_type dwt_reg_type
= {
1695 .get
= cortex_m_dwt_get_reg
,
1696 .set
= cortex_m_dwt_set_reg
,
1699 static void cortex_m_dwt_addreg(struct target
*t
, struct reg
*r
, struct dwt_reg
*d
)
1701 struct dwt_reg_state
*state
;
1703 state
= calloc(1, sizeof *state
);
1706 state
->addr
= d
->addr
;
1711 r
->value
= &state
->value
;
1712 r
->arch_info
= state
;
1713 r
->type
= &dwt_reg_type
;
1716 void cortex_m_dwt_setup(struct cortex_m_common
*cm
, struct target
*target
)
1719 struct reg_cache
*cache
;
1720 struct cortex_m_dwt_comparator
*comparator
;
1723 target_read_u32(target
, DWT_CTRL
, &dwtcr
);
1725 LOG_DEBUG("no DWT");
1729 cm
->dwt_num_comp
= (dwtcr
>> 28) & 0xF;
1730 cm
->dwt_comp_available
= cm
->dwt_num_comp
;
1731 cm
->dwt_comparator_list
= calloc(cm
->dwt_num_comp
,
1732 sizeof(struct cortex_m_dwt_comparator
));
1733 if (!cm
->dwt_comparator_list
) {
1735 cm
->dwt_num_comp
= 0;
1736 LOG_ERROR("out of mem");
1740 cache
= calloc(1, sizeof *cache
);
1743 free(cm
->dwt_comparator_list
);
1746 cache
->name
= "Cortex-M DWT registers";
1747 cache
->num_regs
= 2 + cm
->dwt_num_comp
* 3;
1748 cache
->reg_list
= calloc(cache
->num_regs
, sizeof *cache
->reg_list
);
1749 if (!cache
->reg_list
) {
1754 for (reg
= 0; reg
< 2; reg
++)
1755 cortex_m_dwt_addreg(target
, cache
->reg_list
+ reg
,
1756 dwt_base_regs
+ reg
);
1758 comparator
= cm
->dwt_comparator_list
;
1759 for (i
= 0; i
< cm
->dwt_num_comp
; i
++, comparator
++) {
1762 comparator
->dwt_comparator_address
= DWT_COMP0
+ 0x10 * i
;
1763 for (j
= 0; j
< 3; j
++, reg
++)
1764 cortex_m_dwt_addreg(target
, cache
->reg_list
+ reg
,
1765 dwt_comp
+ 3 * i
+ j
);
1767 /* make sure we clear any watchpoints enabled on the target */
1768 target_write_u32(target
, comparator
->dwt_comparator_address
+ 8, 0);
1771 *register_get_last_cache_p(&target
->reg_cache
) = cache
;
1772 cm
->dwt_cache
= cache
;
1774 LOG_DEBUG("DWT dwtcr 0x%" PRIx32
", comp %d, watch%s",
1775 dwtcr
, cm
->dwt_num_comp
,
1776 (dwtcr
& (0xf << 24)) ? " only" : "/trigger");
1778 /* REVISIT: if num_comp > 1, check whether comparator #1 can
1779 * implement single-address data value watchpoints ... so we
1780 * won't need to check it later, when asked to set one up.
1784 #define MVFR0 0xe000ef40
1785 #define MVFR1 0xe000ef44
1787 #define MVFR0_DEFAULT_M4 0x10110021
1788 #define MVFR1_DEFAULT_M4 0x11000011
1790 int cortex_m_examine(struct target
*target
)
1793 uint32_t cpuid
, fpcr
, mvfr0
, mvfr1
;
1795 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1796 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
1797 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1799 /* stlink shares the examine handler but does not support
1801 if (!armv7m
->stlink
) {
1802 retval
= ahbap_debugport_init(swjdp
);
1803 if (retval
!= ERROR_OK
)
1807 if (!target_was_examined(target
)) {
1808 target_set_examined(target
);
1810 /* Read from Device Identification Registers */
1811 retval
= target_read_u32(target
, CPUID
, &cpuid
);
1812 if (retval
!= ERROR_OK
)
1816 i
= (cpuid
>> 4) & 0xf;
1818 LOG_DEBUG("Cortex-M%d r%" PRId8
"p%" PRId8
" processor detected",
1819 i
, (uint8_t)((cpuid
>> 20) & 0xf), (uint8_t)((cpuid
>> 0) & 0xf));
1820 LOG_DEBUG("cpuid: 0x%8.8" PRIx32
"", cpuid
);
1822 /* test for floating point feature on cortex-m4 */
1824 target_read_u32(target
, MVFR0
, &mvfr0
);
1825 target_read_u32(target
, MVFR1
, &mvfr1
);
1827 if ((mvfr0
== MVFR0_DEFAULT_M4
) && (mvfr1
== MVFR1_DEFAULT_M4
)) {
1828 LOG_DEBUG("Cortex-M%d floating point feature FPv4_SP found", i
);
1829 armv7m
->fp_feature
= FPv4_SP
;
1831 } else if (i
== 0) {
1832 /* Cortex-M0 does not support unaligned memory access */
1833 armv7m
->arm
.is_armv6m
= true;
1836 if (i
== 4 || i
== 3) {
1837 /* Cortex-M3/M4 has 4096 bytes autoincrement range */
1838 armv7m
->dap
.tar_autoincr_block
= (1 << 12);
1841 /* NOTE: FPB and DWT are both optional. */
1844 target_read_u32(target
, FP_CTRL
, &fpcr
);
1845 cortex_m
->auto_bp_type
= 1;
1846 /* bits [14:12] and [7:4] */
1847 cortex_m
->fp_num_code
= ((fpcr
>> 8) & 0x70) | ((fpcr
>> 4) & 0xF);
1848 cortex_m
->fp_num_lit
= (fpcr
>> 8) & 0xF;
1849 cortex_m
->fp_code_available
= cortex_m
->fp_num_code
;
1850 cortex_m
->fp_comparator_list
= calloc(
1851 cortex_m
->fp_num_code
+ cortex_m
->fp_num_lit
,
1852 sizeof(struct cortex_m_fp_comparator
));
1853 cortex_m
->fpb_enabled
= fpcr
& 1;
1854 for (i
= 0; i
< cortex_m
->fp_num_code
+ cortex_m
->fp_num_lit
; i
++) {
1855 cortex_m
->fp_comparator_list
[i
].type
=
1856 (i
< cortex_m
->fp_num_code
) ? FPCR_CODE
: FPCR_LITERAL
;
1857 cortex_m
->fp_comparator_list
[i
].fpcr_address
= FP_COMP0
+ 4 * i
;
1859 /* make sure we clear any breakpoints enabled on the target */
1860 target_write_u32(target
, cortex_m
->fp_comparator_list
[i
].fpcr_address
, 0);
1862 LOG_DEBUG("FPB fpcr 0x%" PRIx32
", numcode %i, numlit %i",
1864 cortex_m
->fp_num_code
,
1865 cortex_m
->fp_num_lit
);
1868 cortex_m_dwt_setup(cortex_m
, target
);
1870 /* These hardware breakpoints only work for code in flash! */
1871 LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
1872 target_name(target
),
1873 cortex_m
->fp_num_code
,
1874 cortex_m
->dwt_num_comp
);
1880 static int cortex_m_dcc_read(struct target
*target
, uint8_t *value
, uint8_t *ctrl
)
1882 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1883 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
1888 retval
= mem_ap_read(swjdp
, buf
, 2, 1, DCB_DCRDR
, false);
1889 if (retval
!= ERROR_OK
)
1892 dcrdr
= target_buffer_get_u16(target
, buf
);
1893 *ctrl
= (uint8_t)dcrdr
;
1894 *value
= (uint8_t)(dcrdr
>> 8);
1896 LOG_DEBUG("data 0x%x ctrl 0x%x", *value
, *ctrl
);
1898 /* write ack back to software dcc register
1899 * signify we have read data */
1900 if (dcrdr
& (1 << 0)) {
1901 target_buffer_set_u16(target
, buf
, 0);
1902 retval
= mem_ap_write(swjdp
, buf
, 2, 1, DCB_DCRDR
, false);
1903 if (retval
!= ERROR_OK
)
1910 static int cortex_m_target_request_data(struct target
*target
,
1911 uint32_t size
, uint8_t *buffer
)
1917 for (i
= 0; i
< (size
* 4); i
++) {
1918 int retval
= cortex_m_dcc_read(target
, &data
, &ctrl
);
1919 if (retval
!= ERROR_OK
)
1927 static int cortex_m_handle_target_request(void *priv
)
1929 struct target
*target
= priv
;
1930 if (!target_was_examined(target
))
1933 if (!target
->dbg_msg_enabled
)
1936 if (target
->state
== TARGET_RUNNING
) {
1941 retval
= cortex_m_dcc_read(target
, &data
, &ctrl
);
1942 if (retval
!= ERROR_OK
)
1945 /* check if we have data */
1946 if (ctrl
& (1 << 0)) {
1949 /* we assume target is quick enough */
1951 for (int i
= 1; i
<= 3; i
++) {
1952 retval
= cortex_m_dcc_read(target
, &data
, &ctrl
);
1953 if (retval
!= ERROR_OK
)
1955 request
|= ((uint32_t)data
<< (i
* 8));
1957 target_request(target
, request
);
1964 static int cortex_m_init_arch_info(struct target
*target
,
1965 struct cortex_m_common
*cortex_m
, struct jtag_tap
*tap
)
1968 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
1970 armv7m_init_arch_info(target
, armv7m
);
1972 /* prepare JTAG information for the new target */
1973 cortex_m
->jtag_info
.tap
= tap
;
1974 cortex_m
->jtag_info
.scann_size
= 4;
1976 /* default reset mode is to use srst if fitted
1977 * if not it will use CORTEX_M3_RESET_VECTRESET */
1978 cortex_m
->soft_reset_config
= CORTEX_M_RESET_VECTRESET
;
1980 armv7m
->arm
.dap
= &armv7m
->dap
;
1982 /* Leave (only) generic DAP stuff for debugport_init(); */
1983 armv7m
->dap
.jtag_info
= &cortex_m
->jtag_info
;
1984 armv7m
->dap
.memaccess_tck
= 8;
1986 /* Cortex-M3/M4 has 4096 bytes autoincrement range
1987 * but set a safe default to 1024 to support Cortex-M0
1988 * this will be changed in cortex_m3_examine if a M3/M4 is detected */
1989 armv7m
->dap
.tar_autoincr_block
= (1 << 10);
1991 /* register arch-specific functions */
1992 armv7m
->examine_debug_reason
= cortex_m_examine_debug_reason
;
1994 armv7m
->post_debug_entry
= NULL
;
1996 armv7m
->pre_restore_context
= NULL
;
1998 armv7m
->load_core_reg_u32
= cortex_m_load_core_reg_u32
;
1999 armv7m
->store_core_reg_u32
= cortex_m_store_core_reg_u32
;
2001 target_register_timer_callback(cortex_m_handle_target_request
, 1, 1, target
);
2003 retval
= arm_jtag_setup_connection(&cortex_m
->jtag_info
);
2004 if (retval
!= ERROR_OK
)
2010 static int cortex_m_target_create(struct target
*target
, Jim_Interp
*interp
)
2012 struct cortex_m_common
*cortex_m
= calloc(1, sizeof(struct cortex_m_common
));
2014 cortex_m
->common_magic
= CORTEX_M_COMMON_MAGIC
;
2015 cortex_m_init_arch_info(target
, cortex_m
, target
->tap
);
2020 /*--------------------------------------------------------------------------*/
2022 static int cortex_m_verify_pointer(struct command_context
*cmd_ctx
,
2023 struct cortex_m_common
*cm
)
2025 if (cm
->common_magic
!= CORTEX_M_COMMON_MAGIC
) {
2026 command_print(cmd_ctx
, "target is not a Cortex-M");
2027 return ERROR_TARGET_INVALID
;
2033 * Only stuff below this line should need to verify that its target
2034 * is a Cortex-M3. Everything else should have indirected through the
2035 * cortexm3_target structure, which is only used with CM3 targets.
2038 static const struct {
2042 { "hard_err", VC_HARDERR
, },
2043 { "int_err", VC_INTERR
, },
2044 { "bus_err", VC_BUSERR
, },
2045 { "state_err", VC_STATERR
, },
2046 { "chk_err", VC_CHKERR
, },
2047 { "nocp_err", VC_NOCPERR
, },
2048 { "mm_err", VC_MMERR
, },
2049 { "reset", VC_CORERESET
, },
2052 COMMAND_HANDLER(handle_cortex_m_vector_catch_command
)
2054 struct target
*target
= get_current_target(CMD_CTX
);
2055 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
2056 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
2057 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
2061 retval
= cortex_m_verify_pointer(CMD_CTX
, cortex_m
);
2062 if (retval
!= ERROR_OK
)
2065 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DEMCR
, &demcr
);
2066 if (retval
!= ERROR_OK
)
2072 if (CMD_ARGC
== 1) {
2073 if (strcmp(CMD_ARGV
[0], "all") == 0) {
2074 catch = VC_HARDERR
| VC_INTERR
| VC_BUSERR
2075 | VC_STATERR
| VC_CHKERR
| VC_NOCPERR
2076 | VC_MMERR
| VC_CORERESET
;
2078 } else if (strcmp(CMD_ARGV
[0], "none") == 0)
2081 while (CMD_ARGC
-- > 0) {
2083 for (i
= 0; i
< ARRAY_SIZE(vec_ids
); i
++) {
2084 if (strcmp(CMD_ARGV
[CMD_ARGC
], vec_ids
[i
].name
) != 0)
2086 catch |= vec_ids
[i
].mask
;
2089 if (i
== ARRAY_SIZE(vec_ids
)) {
2090 LOG_ERROR("No CM3 vector '%s'", CMD_ARGV
[CMD_ARGC
]);
2091 return ERROR_COMMAND_SYNTAX_ERROR
;
2095 /* For now, armv7m->demcr only stores vector catch flags. */
2096 armv7m
->demcr
= catch;
2101 /* write, but don't assume it stuck (why not??) */
2102 retval
= mem_ap_write_u32(swjdp
, DCB_DEMCR
, demcr
);
2103 if (retval
!= ERROR_OK
)
2105 retval
= mem_ap_read_atomic_u32(swjdp
, DCB_DEMCR
, &demcr
);
2106 if (retval
!= ERROR_OK
)
2109 /* FIXME be sure to clear DEMCR on clean server shutdown.
2110 * Otherwise the vector catch hardware could fire when there's
2111 * no debugger hooked up, causing much confusion...
2115 for (unsigned i
= 0; i
< ARRAY_SIZE(vec_ids
); i
++) {
2116 command_print(CMD_CTX
, "%9s: %s", vec_ids
[i
].name
,
2117 (demcr
& vec_ids
[i
].mask
) ? "catch" : "ignore");
2123 COMMAND_HANDLER(handle_cortex_m_mask_interrupts_command
)
2125 struct target
*target
= get_current_target(CMD_CTX
);
2126 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
2129 static const Jim_Nvp nvp_maskisr_modes
[] = {
2130 { .name
= "auto", .value
= CORTEX_M_ISRMASK_AUTO
},
2131 { .name
= "off", .value
= CORTEX_M_ISRMASK_OFF
},
2132 { .name
= "on", .value
= CORTEX_M_ISRMASK_ON
},
2133 { .name
= NULL
, .value
= -1 },
2138 retval
= cortex_m_verify_pointer(CMD_CTX
, cortex_m
);
2139 if (retval
!= ERROR_OK
)
2142 if (target
->state
!= TARGET_HALTED
) {
2143 command_print(CMD_CTX
, "target must be stopped for \"%s\" command", CMD_NAME
);
2148 n
= Jim_Nvp_name2value_simple(nvp_maskisr_modes
, CMD_ARGV
[0]);
2149 if (n
->name
== NULL
)
2150 return ERROR_COMMAND_SYNTAX_ERROR
;
2151 cortex_m
->isrmasking_mode
= n
->value
;
2154 if (cortex_m
->isrmasking_mode
== CORTEX_M_ISRMASK_ON
)
2155 cortex_m_write_debug_halt_mask(target
, C_HALT
| C_MASKINTS
, 0);
2157 cortex_m_write_debug_halt_mask(target
, C_HALT
, C_MASKINTS
);
2160 n
= Jim_Nvp_value2name_simple(nvp_maskisr_modes
, cortex_m
->isrmasking_mode
);
2161 command_print(CMD_CTX
, "cortex_m interrupt mask %s", n
->name
);
2166 COMMAND_HANDLER(handle_cortex_m_reset_config_command
)
2168 struct target
*target
= get_current_target(CMD_CTX
);
2169 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
2173 retval
= cortex_m_verify_pointer(CMD_CTX
, cortex_m
);
2174 if (retval
!= ERROR_OK
)
2178 if (strcmp(*CMD_ARGV
, "sysresetreq") == 0)
2179 cortex_m
->soft_reset_config
= CORTEX_M_RESET_SYSRESETREQ
;
2180 else if (strcmp(*CMD_ARGV
, "vectreset") == 0)
2181 cortex_m
->soft_reset_config
= CORTEX_M_RESET_VECTRESET
;
2184 switch (cortex_m
->soft_reset_config
) {
2185 case CORTEX_M_RESET_SYSRESETREQ
:
2186 reset_config
= "sysresetreq";
2189 case CORTEX_M_RESET_VECTRESET
:
2190 reset_config
= "vectreset";
2194 reset_config
= "unknown";
2198 command_print(CMD_CTX
, "cortex_m reset_config %s", reset_config
);
2203 static const struct command_registration cortex_m_exec_command_handlers
[] = {
2206 .handler
= handle_cortex_m_mask_interrupts_command
,
2207 .mode
= COMMAND_EXEC
,
2208 .help
= "mask cortex_m interrupts",
2209 .usage
= "['auto'|'on'|'off']",
2212 .name
= "vector_catch",
2213 .handler
= handle_cortex_m_vector_catch_command
,
2214 .mode
= COMMAND_EXEC
,
2215 .help
= "configure hardware vectors to trigger debug entry",
2216 .usage
= "['all'|'none'|('bus_err'|'chk_err'|...)*]",
2219 .name
= "reset_config",
2220 .handler
= handle_cortex_m_reset_config_command
,
2221 .mode
= COMMAND_ANY
,
2222 .help
= "configure software reset handling",
2223 .usage
= "['srst'|'sysresetreq'|'vectreset']",
2225 COMMAND_REGISTRATION_DONE
2227 static const struct command_registration cortex_m_command_handlers
[] = {
2229 .chain
= armv7m_command_handlers
,
2233 .mode
= COMMAND_EXEC
,
2234 .help
= "Cortex-M command group",
2236 .chain
= cortex_m_exec_command_handlers
,
2238 COMMAND_REGISTRATION_DONE
2241 struct target_type cortexm_target
= {
2243 .deprecated_name
= "cortex_m3",
2245 .poll
= cortex_m_poll
,
2246 .arch_state
= armv7m_arch_state
,
2248 .target_request_data
= cortex_m_target_request_data
,
2250 .halt
= cortex_m_halt
,
2251 .resume
= cortex_m_resume
,
2252 .step
= cortex_m_step
,
2254 .assert_reset
= cortex_m_assert_reset
,
2255 .deassert_reset
= cortex_m_deassert_reset
,
2256 .soft_reset_halt
= cortex_m_soft_reset_halt
,
2258 .get_gdb_reg_list
= armv7m_get_gdb_reg_list
,
2260 .read_memory
= cortex_m_read_memory
,
2261 .write_memory
= cortex_m_write_memory
,
2262 .checksum_memory
= armv7m_checksum_memory
,
2263 .blank_check_memory
= armv7m_blank_check_memory
,
2265 .run_algorithm
= armv7m_run_algorithm
,
2266 .start_algorithm
= armv7m_start_algorithm
,
2267 .wait_algorithm
= armv7m_wait_algorithm
,
2269 .add_breakpoint
= cortex_m_add_breakpoint
,
2270 .remove_breakpoint
= cortex_m_remove_breakpoint
,
2271 .add_watchpoint
= cortex_m_add_watchpoint
,
2272 .remove_watchpoint
= cortex_m_remove_watchpoint
,
2274 .commands
= cortex_m_command_handlers
,
2275 .target_create
= cortex_m_target_create
,
2276 .init_target
= cortex_m_init_target
,
2277 .examine
= cortex_m_examine
,