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 FPB 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
54 /* forward declarations */
55 static int cortex_m_store_core_reg_u32(struct target
*target
,
56 uint32_t num
, uint32_t value
);
57 static void cortex_m_dwt_free(struct target
*target
);
59 static int cortexm_dap_read_coreregister_u32(struct target
*target
,
60 uint32_t *value
, int regnum
)
62 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
66 /* because the DCB_DCRDR is used for the emulated dcc channel
67 * we have to save/restore the DCB_DCRDR when used */
68 if (target
->dbg_msg_enabled
) {
69 retval
= mem_ap_read_u32(armv7m
->debug_ap
, DCB_DCRDR
, &dcrdr
);
70 if (retval
!= ERROR_OK
)
74 retval
= mem_ap_write_u32(armv7m
->debug_ap
, DCB_DCRSR
, regnum
);
75 if (retval
!= ERROR_OK
)
78 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DCRDR
, value
);
79 if (retval
!= ERROR_OK
)
82 if (target
->dbg_msg_enabled
) {
83 /* restore DCB_DCRDR - this needs to be in a separate
84 * transaction otherwise the emulated DCC channel breaks */
85 if (retval
== ERROR_OK
)
86 retval
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, DCB_DCRDR
, dcrdr
);
92 static int cortexm_dap_write_coreregister_u32(struct target
*target
,
93 uint32_t value
, int regnum
)
95 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
99 /* because the DCB_DCRDR is used for the emulated dcc channel
100 * we have to save/restore the DCB_DCRDR when used */
101 if (target
->dbg_msg_enabled
) {
102 retval
= mem_ap_read_u32(armv7m
->debug_ap
, DCB_DCRDR
, &dcrdr
);
103 if (retval
!= ERROR_OK
)
107 retval
= mem_ap_write_u32(armv7m
->debug_ap
, DCB_DCRDR
, value
);
108 if (retval
!= ERROR_OK
)
111 retval
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, DCB_DCRSR
, regnum
| DCRSR_WnR
);
112 if (retval
!= ERROR_OK
)
115 if (target
->dbg_msg_enabled
) {
116 /* restore DCB_DCRDR - this needs to be in a seperate
117 * transaction otherwise the emulated DCC channel breaks */
118 if (retval
== ERROR_OK
)
119 retval
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, DCB_DCRDR
, dcrdr
);
125 static int cortex_m_write_debug_halt_mask(struct target
*target
,
126 uint32_t mask_on
, uint32_t mask_off
)
128 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
129 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
131 /* mask off status bits */
132 cortex_m
->dcb_dhcsr
&= ~((0xFFFF << 16) | mask_off
);
133 /* create new register mask */
134 cortex_m
->dcb_dhcsr
|= DBGKEY
| C_DEBUGEN
| mask_on
;
136 return mem_ap_write_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, cortex_m
->dcb_dhcsr
);
139 static int cortex_m_clear_halt(struct target
*target
)
141 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
142 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
145 /* clear step if any */
146 cortex_m_write_debug_halt_mask(target
, C_HALT
, C_STEP
);
148 /* Read Debug Fault Status Register */
149 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, NVIC_DFSR
, &cortex_m
->nvic_dfsr
);
150 if (retval
!= ERROR_OK
)
153 /* Clear Debug Fault Status */
154 retval
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, NVIC_DFSR
, cortex_m
->nvic_dfsr
);
155 if (retval
!= ERROR_OK
)
157 LOG_DEBUG(" NVIC_DFSR 0x%" PRIx32
"", cortex_m
->nvic_dfsr
);
162 static int cortex_m_single_step_core(struct target
*target
)
164 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
165 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
168 /* Mask interrupts before clearing halt, if not done already. This avoids
169 * Erratum 377497 (fixed in r1p0) where setting MASKINTS while clearing
170 * HALT can put the core into an unknown state.
172 if (!(cortex_m
->dcb_dhcsr
& C_MASKINTS
)) {
173 retval
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
,
174 DBGKEY
| C_MASKINTS
| C_HALT
| C_DEBUGEN
);
175 if (retval
!= ERROR_OK
)
178 retval
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
,
179 DBGKEY
| C_MASKINTS
| C_STEP
| C_DEBUGEN
);
180 if (retval
!= ERROR_OK
)
184 /* restore dhcsr reg */
185 cortex_m_clear_halt(target
);
190 static int cortex_m_enable_fpb(struct target
*target
)
192 int retval
= target_write_u32(target
, FP_CTRL
, 3);
193 if (retval
!= ERROR_OK
)
196 /* check the fpb is actually enabled */
198 retval
= target_read_u32(target
, FP_CTRL
, &fpctrl
);
199 if (retval
!= ERROR_OK
)
208 static int cortex_m_endreset_event(struct target
*target
)
213 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
214 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
215 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
216 struct cortex_m_fp_comparator
*fp_list
= cortex_m
->fp_comparator_list
;
217 struct cortex_m_dwt_comparator
*dwt_list
= cortex_m
->dwt_comparator_list
;
219 /* REVISIT The four debug monitor bits are currently ignored... */
220 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DEMCR
, &dcb_demcr
);
221 if (retval
!= ERROR_OK
)
223 LOG_DEBUG("DCB_DEMCR = 0x%8.8" PRIx32
"", dcb_demcr
);
225 /* this register is used for emulated dcc channel */
226 retval
= mem_ap_write_u32(armv7m
->debug_ap
, DCB_DCRDR
, 0);
227 if (retval
!= ERROR_OK
)
230 /* Enable debug requests */
231 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
232 if (retval
!= ERROR_OK
)
234 if (!(cortex_m
->dcb_dhcsr
& C_DEBUGEN
)) {
235 retval
= cortex_m_write_debug_halt_mask(target
, 0, C_HALT
| C_STEP
| C_MASKINTS
);
236 if (retval
!= ERROR_OK
)
240 /* Restore proper interrupt masking setting. */
241 if (cortex_m
->isrmasking_mode
== CORTEX_M_ISRMASK_ON
)
242 cortex_m_write_debug_halt_mask(target
, C_MASKINTS
, 0);
244 cortex_m_write_debug_halt_mask(target
, 0, C_MASKINTS
);
246 /* Enable features controlled by ITM and DWT blocks, and catch only
247 * the vectors we were told to pay attention to.
249 * Target firmware is responsible for all fault handling policy
250 * choices *EXCEPT* explicitly scripted overrides like "vector_catch"
251 * or manual updates to the NVIC SHCSR and CCR registers.
253 retval
= mem_ap_write_u32(armv7m
->debug_ap
, DCB_DEMCR
, TRCENA
| armv7m
->demcr
);
254 if (retval
!= ERROR_OK
)
257 /* Paranoia: evidently some (early?) chips don't preserve all the
258 * debug state (including FPB, DWT, etc) across reset...
262 retval
= cortex_m_enable_fpb(target
);
263 if (retval
!= ERROR_OK
) {
264 LOG_ERROR("Failed to enable the FPB");
268 cortex_m
->fpb_enabled
= 1;
270 /* Restore FPB registers */
271 for (i
= 0; i
< cortex_m
->fp_num_code
+ cortex_m
->fp_num_lit
; i
++) {
272 retval
= target_write_u32(target
, fp_list
[i
].fpcr_address
, fp_list
[i
].fpcr_value
);
273 if (retval
!= ERROR_OK
)
277 /* Restore DWT registers */
278 for (i
= 0; i
< cortex_m
->dwt_num_comp
; i
++) {
279 retval
= target_write_u32(target
, dwt_list
[i
].dwt_comparator_address
+ 0,
281 if (retval
!= ERROR_OK
)
283 retval
= target_write_u32(target
, dwt_list
[i
].dwt_comparator_address
+ 4,
285 if (retval
!= ERROR_OK
)
287 retval
= target_write_u32(target
, dwt_list
[i
].dwt_comparator_address
+ 8,
288 dwt_list
[i
].function
);
289 if (retval
!= ERROR_OK
)
292 retval
= dap_run(swjdp
);
293 if (retval
!= ERROR_OK
)
296 register_cache_invalidate(armv7m
->arm
.core_cache
);
298 /* make sure we have latest dhcsr flags */
299 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
304 static int cortex_m_examine_debug_reason(struct target
*target
)
306 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
308 /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason
309 * only check the debug reason if we don't know it already */
311 if ((target
->debug_reason
!= DBG_REASON_DBGRQ
)
312 && (target
->debug_reason
!= DBG_REASON_SINGLESTEP
)) {
313 if (cortex_m
->nvic_dfsr
& DFSR_BKPT
) {
314 target
->debug_reason
= DBG_REASON_BREAKPOINT
;
315 if (cortex_m
->nvic_dfsr
& DFSR_DWTTRAP
)
316 target
->debug_reason
= DBG_REASON_WPTANDBKPT
;
317 } else if (cortex_m
->nvic_dfsr
& DFSR_DWTTRAP
)
318 target
->debug_reason
= DBG_REASON_WATCHPOINT
;
319 else if (cortex_m
->nvic_dfsr
& DFSR_VCATCH
)
320 target
->debug_reason
= DBG_REASON_BREAKPOINT
;
321 else /* EXTERNAL, HALTED */
322 target
->debug_reason
= DBG_REASON_UNDEFINED
;
328 static int cortex_m_examine_exception_reason(struct target
*target
)
330 uint32_t shcsr
= 0, except_sr
= 0, cfsr
= -1, except_ar
= -1;
331 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
332 struct adiv5_dap
*swjdp
= armv7m
->arm
.dap
;
335 retval
= mem_ap_read_u32(armv7m
->debug_ap
, NVIC_SHCSR
, &shcsr
);
336 if (retval
!= ERROR_OK
)
338 switch (armv7m
->exception_number
) {
341 case 3: /* Hard Fault */
342 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, NVIC_HFSR
, &except_sr
);
343 if (retval
!= ERROR_OK
)
345 if (except_sr
& 0x40000000) {
346 retval
= mem_ap_read_u32(armv7m
->debug_ap
, NVIC_CFSR
, &cfsr
);
347 if (retval
!= ERROR_OK
)
351 case 4: /* Memory Management */
352 retval
= mem_ap_read_u32(armv7m
->debug_ap
, NVIC_CFSR
, &except_sr
);
353 if (retval
!= ERROR_OK
)
355 retval
= mem_ap_read_u32(armv7m
->debug_ap
, NVIC_MMFAR
, &except_ar
);
356 if (retval
!= ERROR_OK
)
359 case 5: /* Bus Fault */
360 retval
= mem_ap_read_u32(armv7m
->debug_ap
, NVIC_CFSR
, &except_sr
);
361 if (retval
!= ERROR_OK
)
363 retval
= mem_ap_read_u32(armv7m
->debug_ap
, NVIC_BFAR
, &except_ar
);
364 if (retval
!= ERROR_OK
)
367 case 6: /* Usage Fault */
368 retval
= mem_ap_read_u32(armv7m
->debug_ap
, NVIC_CFSR
, &except_sr
);
369 if (retval
!= ERROR_OK
)
372 case 11: /* SVCall */
374 case 12: /* Debug Monitor */
375 retval
= mem_ap_read_u32(armv7m
->debug_ap
, NVIC_DFSR
, &except_sr
);
376 if (retval
!= ERROR_OK
)
379 case 14: /* PendSV */
381 case 15: /* SysTick */
387 retval
= dap_run(swjdp
);
388 if (retval
== ERROR_OK
)
389 LOG_DEBUG("%s SHCSR 0x%" PRIx32
", SR 0x%" PRIx32
390 ", CFSR 0x%" PRIx32
", AR 0x%" PRIx32
,
391 armv7m_exception_string(armv7m
->exception_number
),
392 shcsr
, except_sr
, cfsr
, except_ar
);
396 static int cortex_m_debug_entry(struct target
*target
)
401 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
402 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
403 struct arm
*arm
= &armv7m
->arm
;
408 cortex_m_clear_halt(target
);
409 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
410 if (retval
!= ERROR_OK
)
413 retval
= armv7m
->examine_debug_reason(target
);
414 if (retval
!= ERROR_OK
)
417 /* Examine target state and mode
418 * First load register accessible through core debug port */
419 int num_regs
= arm
->core_cache
->num_regs
;
421 for (i
= 0; i
< num_regs
; i
++) {
422 r
= &armv7m
->arm
.core_cache
->reg_list
[i
];
424 arm
->read_core_reg(target
, r
, i
, ARM_MODE_ANY
);
428 xPSR
= buf_get_u32(r
->value
, 0, 32);
430 /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
433 cortex_m_store_core_reg_u32(target
, 16, xPSR
& ~0xff);
436 /* Are we in an exception handler */
438 armv7m
->exception_number
= (xPSR
& 0x1FF);
440 arm
->core_mode
= ARM_MODE_HANDLER
;
441 arm
->map
= armv7m_msp_reg_map
;
443 unsigned control
= buf_get_u32(arm
->core_cache
444 ->reg_list
[ARMV7M_CONTROL
].value
, 0, 2);
446 /* is this thread privileged? */
447 arm
->core_mode
= control
& 1
448 ? ARM_MODE_USER_THREAD
451 /* which stack is it using? */
453 arm
->map
= armv7m_psp_reg_map
;
455 arm
->map
= armv7m_msp_reg_map
;
457 armv7m
->exception_number
= 0;
460 if (armv7m
->exception_number
)
461 cortex_m_examine_exception_reason(target
);
463 LOG_DEBUG("entered debug state in core mode: %s at PC 0x%" PRIx32
", target->state: %s",
464 arm_mode_name(arm
->core_mode
),
465 buf_get_u32(arm
->pc
->value
, 0, 32),
466 target_state_name(target
));
468 if (armv7m
->post_debug_entry
) {
469 retval
= armv7m
->post_debug_entry(target
);
470 if (retval
!= ERROR_OK
)
477 static int cortex_m_poll(struct target
*target
)
479 int detected_failure
= ERROR_OK
;
480 int retval
= ERROR_OK
;
481 enum target_state prev_target_state
= target
->state
;
482 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
483 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
485 /* Read from Debug Halting Control and Status Register */
486 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
487 if (retval
!= ERROR_OK
) {
488 target
->state
= TARGET_UNKNOWN
;
492 /* Recover from lockup. See ARMv7-M architecture spec,
493 * section B1.5.15 "Unrecoverable exception cases".
495 if (cortex_m
->dcb_dhcsr
& S_LOCKUP
) {
496 LOG_ERROR("%s -- clearing lockup after double fault",
497 target_name(target
));
498 cortex_m_write_debug_halt_mask(target
, C_HALT
, 0);
499 target
->debug_reason
= DBG_REASON_DBGRQ
;
501 /* We have to execute the rest (the "finally" equivalent, but
502 * still throw this exception again).
504 detected_failure
= ERROR_FAIL
;
506 /* refresh status bits */
507 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
508 if (retval
!= ERROR_OK
)
512 if (cortex_m
->dcb_dhcsr
& S_RESET_ST
) {
513 if (target
->state
!= TARGET_RESET
) {
514 target
->state
= TARGET_RESET
;
515 LOG_INFO("%s: external reset detected", target_name(target
));
520 if (target
->state
== TARGET_RESET
) {
521 /* Cannot switch context while running so endreset is
522 * called with target->state == TARGET_RESET
524 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%" PRIx32
,
525 cortex_m
->dcb_dhcsr
);
526 retval
= cortex_m_endreset_event(target
);
527 if (retval
!= ERROR_OK
) {
528 target
->state
= TARGET_UNKNOWN
;
531 target
->state
= TARGET_RUNNING
;
532 prev_target_state
= TARGET_RUNNING
;
535 if (cortex_m
->dcb_dhcsr
& S_HALT
) {
536 target
->state
= TARGET_HALTED
;
538 if ((prev_target_state
== TARGET_RUNNING
) || (prev_target_state
== TARGET_RESET
)) {
539 retval
= cortex_m_debug_entry(target
);
540 if (retval
!= ERROR_OK
)
543 if (arm_semihosting(target
, &retval
) != 0)
546 target_call_event_callbacks(target
, TARGET_EVENT_HALTED
);
548 if (prev_target_state
== TARGET_DEBUG_RUNNING
) {
550 retval
= cortex_m_debug_entry(target
);
551 if (retval
!= ERROR_OK
)
554 target_call_event_callbacks(target
, TARGET_EVENT_DEBUG_HALTED
);
558 /* REVISIT when S_SLEEP is set, it's in a Sleep or DeepSleep state.
559 * How best to model low power modes?
562 if (target
->state
== TARGET_UNKNOWN
) {
563 /* check if processor is retiring instructions */
564 if (cortex_m
->dcb_dhcsr
& S_RETIRE_ST
) {
565 target
->state
= TARGET_RUNNING
;
570 /* Check that target is truly halted, since the target could be resumed externally */
571 if ((prev_target_state
== TARGET_HALTED
) && !(cortex_m
->dcb_dhcsr
& S_HALT
)) {
572 /* registers are now invalid */
573 register_cache_invalidate(armv7m
->arm
.core_cache
);
575 target
->state
= TARGET_RUNNING
;
576 LOG_WARNING("%s: external resume detected", target_name(target
));
577 target_call_event_callbacks(target
, TARGET_EVENT_RESUMED
);
581 /* Did we detect a failure condition that we cleared? */
582 if (detected_failure
!= ERROR_OK
)
583 retval
= detected_failure
;
587 static int cortex_m_halt(struct target
*target
)
589 LOG_DEBUG("target->state: %s",
590 target_state_name(target
));
592 if (target
->state
== TARGET_HALTED
) {
593 LOG_DEBUG("target was already halted");
597 if (target
->state
== TARGET_UNKNOWN
)
598 LOG_WARNING("target was in unknown state when halt was requested");
600 if (target
->state
== TARGET_RESET
) {
601 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST
) && jtag_get_srst()) {
602 LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
603 return ERROR_TARGET_FAILURE
;
605 /* we came here in a reset_halt or reset_init sequence
606 * debug entry was already prepared in cortex_m3_assert_reset()
608 target
->debug_reason
= DBG_REASON_DBGRQ
;
614 /* Write to Debug Halting Control and Status Register */
615 cortex_m_write_debug_halt_mask(target
, C_HALT
, 0);
617 target
->debug_reason
= DBG_REASON_DBGRQ
;
622 static int cortex_m_soft_reset_halt(struct target
*target
)
624 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
625 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
626 uint32_t dcb_dhcsr
= 0;
627 int retval
, timeout
= 0;
629 /* soft_reset_halt is deprecated on cortex_m as the same functionality
630 * can be obtained by using 'reset halt' and 'cortex_m reset_config vectreset'
631 * As this reset only used VC_CORERESET it would only ever reset the cortex_m
632 * core, not the peripherals */
633 LOG_WARNING("soft_reset_halt is deprecated, please use 'reset halt' instead.");
635 /* Enter debug state on reset; restore DEMCR in endreset_event() */
636 retval
= mem_ap_write_u32(armv7m
->debug_ap
, DCB_DEMCR
,
637 TRCENA
| VC_HARDERR
| VC_BUSERR
| VC_CORERESET
);
638 if (retval
!= ERROR_OK
)
641 /* Request a core-only reset */
642 retval
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, NVIC_AIRCR
,
643 AIRCR_VECTKEY
| AIRCR_VECTRESET
);
644 if (retval
!= ERROR_OK
)
646 target
->state
= TARGET_RESET
;
648 /* registers are now invalid */
649 register_cache_invalidate(cortex_m
->armv7m
.arm
.core_cache
);
651 while (timeout
< 100) {
652 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, &dcb_dhcsr
);
653 if (retval
== ERROR_OK
) {
654 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, NVIC_DFSR
,
655 &cortex_m
->nvic_dfsr
);
656 if (retval
!= ERROR_OK
)
658 if ((dcb_dhcsr
& S_HALT
)
659 && (cortex_m
->nvic_dfsr
& DFSR_VCATCH
)) {
660 LOG_DEBUG("system reset-halted, DHCSR 0x%08x, "
662 (unsigned) dcb_dhcsr
,
663 (unsigned) cortex_m
->nvic_dfsr
);
664 cortex_m_poll(target
);
665 /* FIXME restore user's vector catch config */
668 LOG_DEBUG("waiting for system reset-halt, "
669 "DHCSR 0x%08x, %d ms",
670 (unsigned) dcb_dhcsr
, timeout
);
679 void cortex_m_enable_breakpoints(struct target
*target
)
681 struct breakpoint
*breakpoint
= target
->breakpoints
;
683 /* set any pending breakpoints */
685 if (!breakpoint
->set
)
686 cortex_m_set_breakpoint(target
, breakpoint
);
687 breakpoint
= breakpoint
->next
;
691 static int cortex_m_resume(struct target
*target
, int current
,
692 target_addr_t address
, int handle_breakpoints
, int debug_execution
)
694 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
695 struct breakpoint
*breakpoint
= NULL
;
699 if (target
->state
!= TARGET_HALTED
) {
700 LOG_WARNING("target not halted");
701 return ERROR_TARGET_NOT_HALTED
;
704 if (!debug_execution
) {
705 target_free_all_working_areas(target
);
706 cortex_m_enable_breakpoints(target
);
707 cortex_m_enable_watchpoints(target
);
710 if (debug_execution
) {
711 r
= armv7m
->arm
.core_cache
->reg_list
+ ARMV7M_PRIMASK
;
713 /* Disable interrupts */
714 /* We disable interrupts in the PRIMASK register instead of
715 * masking with C_MASKINTS. This is probably the same issue
716 * as Cortex-M3 Erratum 377493 (fixed in r1p0): C_MASKINTS
717 * in parallel with disabled interrupts can cause local faults
720 * REVISIT this clearly breaks non-debug execution, since the
721 * PRIMASK register state isn't saved/restored... workaround
722 * by never resuming app code after debug execution.
724 buf_set_u32(r
->value
, 0, 1, 1);
728 /* Make sure we are in Thumb mode */
729 r
= armv7m
->arm
.cpsr
;
730 buf_set_u32(r
->value
, 24, 1, 1);
735 /* current = 1: continue on current pc, otherwise continue at <address> */
738 buf_set_u32(r
->value
, 0, 32, address
);
743 /* if we halted last time due to a bkpt instruction
744 * then we have to manually step over it, otherwise
745 * the core will break again */
747 if (!breakpoint_find(target
, buf_get_u32(r
->value
, 0, 32))
749 armv7m_maybe_skip_bkpt_inst(target
, NULL
);
751 resume_pc
= buf_get_u32(r
->value
, 0, 32);
753 armv7m_restore_context(target
);
755 /* the front-end may request us not to handle breakpoints */
756 if (handle_breakpoints
) {
757 /* Single step past breakpoint at current address */
758 breakpoint
= breakpoint_find(target
, resume_pc
);
760 LOG_DEBUG("unset breakpoint at " TARGET_ADDR_FMT
" (ID: %" PRIu32
")",
762 breakpoint
->unique_id
);
763 cortex_m_unset_breakpoint(target
, breakpoint
);
764 cortex_m_single_step_core(target
);
765 cortex_m_set_breakpoint(target
, breakpoint
);
770 cortex_m_write_debug_halt_mask(target
, 0, C_HALT
);
772 target
->debug_reason
= DBG_REASON_NOTHALTED
;
774 /* registers are now invalid */
775 register_cache_invalidate(armv7m
->arm
.core_cache
);
777 if (!debug_execution
) {
778 target
->state
= TARGET_RUNNING
;
779 target_call_event_callbacks(target
, TARGET_EVENT_RESUMED
);
780 LOG_DEBUG("target resumed at 0x%" PRIx32
"", resume_pc
);
782 target
->state
= TARGET_DEBUG_RUNNING
;
783 target_call_event_callbacks(target
, TARGET_EVENT_DEBUG_RESUMED
);
784 LOG_DEBUG("target debug resumed at 0x%" PRIx32
"", resume_pc
);
790 /* int irqstepcount = 0; */
791 static int cortex_m_step(struct target
*target
, int current
,
792 target_addr_t address
, int handle_breakpoints
)
794 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
795 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
796 struct breakpoint
*breakpoint
= NULL
;
797 struct reg
*pc
= armv7m
->arm
.pc
;
798 bool bkpt_inst_found
= false;
800 bool isr_timed_out
= false;
802 if (target
->state
!= TARGET_HALTED
) {
803 LOG_WARNING("target not halted");
804 return ERROR_TARGET_NOT_HALTED
;
807 /* current = 1: continue on current pc, otherwise continue at <address> */
809 buf_set_u32(pc
->value
, 0, 32, address
);
811 uint32_t pc_value
= buf_get_u32(pc
->value
, 0, 32);
813 /* the front-end may request us not to handle breakpoints */
814 if (handle_breakpoints
) {
815 breakpoint
= breakpoint_find(target
, pc_value
);
817 cortex_m_unset_breakpoint(target
, breakpoint
);
820 armv7m_maybe_skip_bkpt_inst(target
, &bkpt_inst_found
);
822 target
->debug_reason
= DBG_REASON_SINGLESTEP
;
824 armv7m_restore_context(target
);
826 target_call_event_callbacks(target
, TARGET_EVENT_RESUMED
);
828 /* if no bkpt instruction is found at pc then we can perform
829 * a normal step, otherwise we have to manually step over the bkpt
830 * instruction - as such simulate a step */
831 if (bkpt_inst_found
== false) {
832 /* Automatic ISR masking mode off: Just step over the next instruction */
833 if ((cortex_m
->isrmasking_mode
!= CORTEX_M_ISRMASK_AUTO
))
834 cortex_m_write_debug_halt_mask(target
, C_STEP
, C_HALT
);
836 /* Process interrupts during stepping in a way they don't interfere
841 * Set a temporary break point at the current pc and let the core run
842 * with interrupts enabled. Pending interrupts get served and we run
843 * into the breakpoint again afterwards. Then we step over the next
844 * instruction with interrupts disabled.
846 * If the pending interrupts don't complete within time, we leave the
847 * core running. This may happen if the interrupts trigger faster
848 * than the core can process them or the handler doesn't return.
850 * If no more breakpoints are available we simply do a step with
851 * interrupts enabled.
857 * If a break point is already set on the lower half word then a break point on
858 * the upper half word will not break again when the core is restarted. So we
859 * just step over the instruction with interrupts disabled.
861 * The documentation has no information about this, it was found by observation
862 * on STM32F1 and STM32F2. Proper explanation welcome. STM32F0 dosen't seem to
863 * suffer from this problem.
865 * To add some confusion: pc_value has bit 0 always set, while the breakpoint
866 * address has it always cleared. The former is done to indicate thumb mode
870 if ((pc_value
& 0x02) && breakpoint_find(target
, pc_value
& ~0x03)) {
871 LOG_DEBUG("Stepping over next instruction with interrupts disabled");
872 cortex_m_write_debug_halt_mask(target
, C_HALT
| C_MASKINTS
, 0);
873 cortex_m_write_debug_halt_mask(target
, C_STEP
, C_HALT
);
874 /* Re-enable interrupts */
875 cortex_m_write_debug_halt_mask(target
, C_HALT
, C_MASKINTS
);
879 /* Set a temporary break point */
881 retval
= cortex_m_set_breakpoint(target
, breakpoint
);
883 retval
= breakpoint_add(target
, pc_value
, 2, BKPT_HARD
);
884 bool tmp_bp_set
= (retval
== ERROR_OK
);
886 /* No more breakpoints left, just do a step */
888 cortex_m_write_debug_halt_mask(target
, C_STEP
, C_HALT
);
891 LOG_DEBUG("Starting core to serve pending interrupts");
892 int64_t t_start
= timeval_ms();
893 cortex_m_write_debug_halt_mask(target
, 0, C_HALT
| C_STEP
);
895 /* Wait for pending handlers to complete or timeout */
897 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
,
899 &cortex_m
->dcb_dhcsr
);
900 if (retval
!= ERROR_OK
) {
901 target
->state
= TARGET_UNKNOWN
;
904 isr_timed_out
= ((timeval_ms() - t_start
) > 500);
905 } while (!((cortex_m
->dcb_dhcsr
& S_HALT
) || isr_timed_out
));
907 /* only remove breakpoint if we created it */
909 cortex_m_unset_breakpoint(target
, breakpoint
);
911 /* Remove the temporary breakpoint */
912 breakpoint_remove(target
, pc_value
);
916 LOG_DEBUG("Interrupt handlers didn't complete within time, "
917 "leaving target running");
919 /* Step over next instruction with interrupts disabled */
920 cortex_m_write_debug_halt_mask(target
,
923 cortex_m_write_debug_halt_mask(target
, C_STEP
, C_HALT
);
924 /* Re-enable interrupts */
925 cortex_m_write_debug_halt_mask(target
, C_HALT
, C_MASKINTS
);
932 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
933 if (retval
!= ERROR_OK
)
936 /* registers are now invalid */
937 register_cache_invalidate(armv7m
->arm
.core_cache
);
940 cortex_m_set_breakpoint(target
, breakpoint
);
943 /* Leave the core running. The user has to stop execution manually. */
944 target
->debug_reason
= DBG_REASON_NOTHALTED
;
945 target
->state
= TARGET_RUNNING
;
949 LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
950 " nvic_icsr = 0x%" PRIx32
,
951 cortex_m
->dcb_dhcsr
, cortex_m
->nvic_icsr
);
953 retval
= cortex_m_debug_entry(target
);
954 if (retval
!= ERROR_OK
)
956 target_call_event_callbacks(target
, TARGET_EVENT_HALTED
);
958 LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
959 " nvic_icsr = 0x%" PRIx32
,
960 cortex_m
->dcb_dhcsr
, cortex_m
->nvic_icsr
);
965 static int cortex_m_assert_reset(struct target
*target
)
967 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
968 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
969 enum cortex_m_soft_reset_config reset_config
= cortex_m
->soft_reset_config
;
971 LOG_DEBUG("target->state: %s",
972 target_state_name(target
));
974 enum reset_types jtag_reset_config
= jtag_get_reset_config();
976 if (target_has_event_action(target
, TARGET_EVENT_RESET_ASSERT
)) {
977 /* allow scripts to override the reset event */
979 target_handle_event(target
, TARGET_EVENT_RESET_ASSERT
);
980 register_cache_invalidate(cortex_m
->armv7m
.arm
.core_cache
);
981 target
->state
= TARGET_RESET
;
986 /* some cores support connecting while srst is asserted
987 * use that mode is it has been configured */
989 bool srst_asserted
= false;
991 if (!target_was_examined(target
)) {
992 if (jtag_reset_config
& RESET_HAS_SRST
) {
993 adapter_assert_reset();
994 if (target
->reset_halt
)
995 LOG_ERROR("Target not examined, will not halt after reset!");
998 LOG_ERROR("Target not examined, reset NOT asserted!");
1003 if ((jtag_reset_config
& RESET_HAS_SRST
) &&
1004 (jtag_reset_config
& RESET_SRST_NO_GATING
)) {
1005 adapter_assert_reset();
1006 srst_asserted
= true;
1009 /* Enable debug requests */
1011 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DHCSR
, &cortex_m
->dcb_dhcsr
);
1012 /* Store important errors instead of failing and proceed to reset assert */
1014 if (retval
!= ERROR_OK
|| !(cortex_m
->dcb_dhcsr
& C_DEBUGEN
))
1015 retval
= cortex_m_write_debug_halt_mask(target
, 0, C_HALT
| C_STEP
| C_MASKINTS
);
1017 /* If the processor is sleeping in a WFI or WFE instruction, the
1018 * C_HALT bit must be asserted to regain control */
1019 if (retval
== ERROR_OK
&& (cortex_m
->dcb_dhcsr
& S_SLEEP
))
1020 retval
= cortex_m_write_debug_halt_mask(target
, C_HALT
, 0);
1022 mem_ap_write_u32(armv7m
->debug_ap
, DCB_DCRDR
, 0);
1023 /* Ignore less important errors */
1025 if (!target
->reset_halt
) {
1026 /* Set/Clear C_MASKINTS in a separate operation */
1027 if (cortex_m
->dcb_dhcsr
& C_MASKINTS
)
1028 cortex_m_write_debug_halt_mask(target
, 0, C_MASKINTS
);
1030 /* clear any debug flags before resuming */
1031 cortex_m_clear_halt(target
);
1033 /* clear C_HALT in dhcsr reg */
1034 cortex_m_write_debug_halt_mask(target
, 0, C_HALT
);
1036 /* Halt in debug on reset; endreset_event() restores DEMCR.
1038 * REVISIT catching BUSERR presumably helps to defend against
1039 * bad vector table entries. Should this include MMERR or
1043 retval2
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, DCB_DEMCR
,
1044 TRCENA
| VC_HARDERR
| VC_BUSERR
| VC_CORERESET
);
1045 if (retval
!= ERROR_OK
|| retval2
!= ERROR_OK
)
1046 LOG_INFO("AP write error, reset will not halt");
1049 if (jtag_reset_config
& RESET_HAS_SRST
) {
1050 /* default to asserting srst */
1052 adapter_assert_reset();
1054 /* srst is asserted, ignore AP access errors */
1057 /* Use a standard Cortex-M3 software reset mechanism.
1058 * We default to using VECRESET as it is supported on all current cores
1059 * (except Cortex-M0, M0+ and M1 which support SYSRESETREQ only!)
1060 * This has the disadvantage of not resetting the peripherals, so a
1061 * reset-init event handler is needed to perform any peripheral resets.
1063 if (!cortex_m
->vectreset_supported
1064 && reset_config
== CORTEX_M_RESET_VECTRESET
) {
1065 reset_config
= CORTEX_M_RESET_SYSRESETREQ
;
1066 LOG_WARNING("VECTRESET is not supported on this Cortex-M core, using SYSRESETREQ instead.");
1067 LOG_WARNING("Set 'cortex_m reset_config sysresetreq'.");
1070 LOG_DEBUG("Using Cortex-M %s", (reset_config
== CORTEX_M_RESET_SYSRESETREQ
)
1071 ? "SYSRESETREQ" : "VECTRESET");
1073 if (reset_config
== CORTEX_M_RESET_VECTRESET
) {
1074 LOG_WARNING("Only resetting the Cortex-M core, use a reset-init event "
1075 "handler to reset any peripherals or configure hardware srst support.");
1079 retval3
= mem_ap_write_atomic_u32(armv7m
->debug_ap
, NVIC_AIRCR
,
1080 AIRCR_VECTKEY
| ((reset_config
== CORTEX_M_RESET_SYSRESETREQ
)
1081 ? AIRCR_SYSRESETREQ
: AIRCR_VECTRESET
));
1082 if (retval3
!= ERROR_OK
)
1083 LOG_DEBUG("Ignoring AP write error right after reset");
1085 retval3
= dap_dp_init(armv7m
->debug_ap
->dap
);
1086 if (retval3
!= ERROR_OK
)
1087 LOG_ERROR("DP initialisation failed");
1090 /* I do not know why this is necessary, but it
1091 * fixes strange effects (step/resume cause NMI
1092 * after reset) on LM3S6918 -- Michael Schwingen
1095 mem_ap_read_atomic_u32(armv7m
->debug_ap
, NVIC_AIRCR
, &tmp
);
1099 target
->state
= TARGET_RESET
;
1100 jtag_add_sleep(50000);
1102 register_cache_invalidate(cortex_m
->armv7m
.arm
.core_cache
);
1104 /* now return stored error code if any */
1105 if (retval
!= ERROR_OK
)
1108 if (target
->reset_halt
) {
1109 retval
= target_halt(target
);
1110 if (retval
!= ERROR_OK
)
1117 static int cortex_m_deassert_reset(struct target
*target
)
1119 struct armv7m_common
*armv7m
= &target_to_cm(target
)->armv7m
;
1121 LOG_DEBUG("target->state: %s",
1122 target_state_name(target
));
1124 /* deassert reset lines */
1125 adapter_deassert_reset();
1127 enum reset_types jtag_reset_config
= jtag_get_reset_config();
1129 if ((jtag_reset_config
& RESET_HAS_SRST
) &&
1130 !(jtag_reset_config
& RESET_SRST_NO_GATING
) &&
1131 target_was_examined(target
)) {
1132 int retval
= dap_dp_init(armv7m
->debug_ap
->dap
);
1133 if (retval
!= ERROR_OK
) {
1134 LOG_ERROR("DP initialisation failed");
1142 int cortex_m_set_breakpoint(struct target
*target
, struct breakpoint
*breakpoint
)
1146 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1147 struct cortex_m_fp_comparator
*comparator_list
= cortex_m
->fp_comparator_list
;
1149 if (breakpoint
->set
) {
1150 LOG_WARNING("breakpoint (BPID: %" PRIu32
") already set", breakpoint
->unique_id
);
1154 if (breakpoint
->type
== BKPT_HARD
) {
1155 uint32_t fpcr_value
;
1156 while (comparator_list
[fp_num
].used
&& (fp_num
< cortex_m
->fp_num_code
))
1158 if (fp_num
>= cortex_m
->fp_num_code
) {
1159 LOG_ERROR("Can not find free FPB Comparator!");
1162 breakpoint
->set
= fp_num
+ 1;
1163 fpcr_value
= breakpoint
->address
| 1;
1164 if (cortex_m
->fp_rev
== 0) {
1165 if (breakpoint
->address
> 0x1FFFFFFF) {
1166 LOG_ERROR("Cortex-M Flash Patch Breakpoint rev.1 cannot handle HW breakpoint above address 0x1FFFFFFE");
1170 hilo
= (breakpoint
->address
& 0x2) ? FPCR_REPLACE_BKPT_HIGH
: FPCR_REPLACE_BKPT_LOW
;
1171 fpcr_value
= (fpcr_value
& 0x1FFFFFFC) | hilo
| 1;
1172 } else if (cortex_m
->fp_rev
> 1) {
1173 LOG_ERROR("Unhandled Cortex-M Flash Patch Breakpoint architecture revision");
1176 comparator_list
[fp_num
].used
= 1;
1177 comparator_list
[fp_num
].fpcr_value
= fpcr_value
;
1178 target_write_u32(target
, comparator_list
[fp_num
].fpcr_address
,
1179 comparator_list
[fp_num
].fpcr_value
);
1180 LOG_DEBUG("fpc_num %i fpcr_value 0x%" PRIx32
"",
1182 comparator_list
[fp_num
].fpcr_value
);
1183 if (!cortex_m
->fpb_enabled
) {
1184 LOG_DEBUG("FPB wasn't enabled, do it now");
1185 retval
= cortex_m_enable_fpb(target
);
1186 if (retval
!= ERROR_OK
) {
1187 LOG_ERROR("Failed to enable the FPB");
1191 cortex_m
->fpb_enabled
= 1;
1193 } else if (breakpoint
->type
== BKPT_SOFT
) {
1196 /* NOTE: on ARMv6-M and ARMv7-M, BKPT(0xab) is used for
1197 * semihosting; don't use that. Otherwise the BKPT
1198 * parameter is arbitrary.
1200 buf_set_u32(code
, 0, 32, ARMV5_T_BKPT(0x11));
1201 retval
= target_read_memory(target
,
1202 breakpoint
->address
& 0xFFFFFFFE,
1203 breakpoint
->length
, 1,
1204 breakpoint
->orig_instr
);
1205 if (retval
!= ERROR_OK
)
1207 retval
= target_write_memory(target
,
1208 breakpoint
->address
& 0xFFFFFFFE,
1209 breakpoint
->length
, 1,
1211 if (retval
!= ERROR_OK
)
1213 breakpoint
->set
= true;
1216 LOG_DEBUG("BPID: %" PRIu32
", Type: %d, Address: " TARGET_ADDR_FMT
" Length: %d (set=%d)",
1217 breakpoint
->unique_id
,
1218 (int)(breakpoint
->type
),
1219 breakpoint
->address
,
1226 int cortex_m_unset_breakpoint(struct target
*target
, struct breakpoint
*breakpoint
)
1229 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1230 struct cortex_m_fp_comparator
*comparator_list
= cortex_m
->fp_comparator_list
;
1232 if (!breakpoint
->set
) {
1233 LOG_WARNING("breakpoint not set");
1237 LOG_DEBUG("BPID: %" PRIu32
", Type: %d, Address: " TARGET_ADDR_FMT
" Length: %d (set=%d)",
1238 breakpoint
->unique_id
,
1239 (int)(breakpoint
->type
),
1240 breakpoint
->address
,
1244 if (breakpoint
->type
== BKPT_HARD
) {
1245 int fp_num
= breakpoint
->set
- 1;
1246 if ((fp_num
< 0) || (fp_num
>= cortex_m
->fp_num_code
)) {
1247 LOG_DEBUG("Invalid FP Comparator number in breakpoint");
1250 comparator_list
[fp_num
].used
= 0;
1251 comparator_list
[fp_num
].fpcr_value
= 0;
1252 target_write_u32(target
, comparator_list
[fp_num
].fpcr_address
,
1253 comparator_list
[fp_num
].fpcr_value
);
1255 /* restore original instruction (kept in target endianness) */
1256 if (breakpoint
->length
== 4) {
1257 retval
= target_write_memory(target
, breakpoint
->address
& 0xFFFFFFFE, 4, 1,
1258 breakpoint
->orig_instr
);
1259 if (retval
!= ERROR_OK
)
1262 retval
= target_write_memory(target
, breakpoint
->address
& 0xFFFFFFFE, 2, 1,
1263 breakpoint
->orig_instr
);
1264 if (retval
!= ERROR_OK
)
1268 breakpoint
->set
= false;
1273 int cortex_m_add_breakpoint(struct target
*target
, struct breakpoint
*breakpoint
)
1275 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1277 if ((breakpoint
->type
== BKPT_HARD
) && (cortex_m
->fp_code_available
< 1)) {
1278 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
1279 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1282 if (breakpoint
->length
== 3) {
1283 LOG_DEBUG("Using a two byte breakpoint for 32bit Thumb-2 request");
1284 breakpoint
->length
= 2;
1287 if ((breakpoint
->length
!= 2)) {
1288 LOG_INFO("only breakpoints of two bytes length supported");
1289 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1292 if (breakpoint
->type
== BKPT_HARD
)
1293 cortex_m
->fp_code_available
--;
1295 return cortex_m_set_breakpoint(target
, breakpoint
);
1298 int cortex_m_remove_breakpoint(struct target
*target
, struct breakpoint
*breakpoint
)
1300 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1302 /* REVISIT why check? FPB can be updated with core running ... */
1303 if (target
->state
!= TARGET_HALTED
) {
1304 LOG_WARNING("target not halted");
1305 return ERROR_TARGET_NOT_HALTED
;
1308 if (breakpoint
->set
)
1309 cortex_m_unset_breakpoint(target
, breakpoint
);
1311 if (breakpoint
->type
== BKPT_HARD
)
1312 cortex_m
->fp_code_available
++;
1317 int cortex_m_set_watchpoint(struct target
*target
, struct watchpoint
*watchpoint
)
1320 uint32_t mask
, temp
;
1321 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1323 /* watchpoint params were validated earlier */
1325 temp
= watchpoint
->length
;
1332 /* REVISIT Don't fully trust these "not used" records ... users
1333 * may set up breakpoints by hand, e.g. dual-address data value
1334 * watchpoint using comparator #1; comparator #0 matching cycle
1335 * count; send data trace info through ITM and TPIU; etc
1337 struct cortex_m_dwt_comparator
*comparator
;
1339 for (comparator
= cortex_m
->dwt_comparator_list
;
1340 comparator
->used
&& dwt_num
< cortex_m
->dwt_num_comp
;
1341 comparator
++, dwt_num
++)
1343 if (dwt_num
>= cortex_m
->dwt_num_comp
) {
1344 LOG_ERROR("Can not find free DWT Comparator");
1347 comparator
->used
= 1;
1348 watchpoint
->set
= dwt_num
+ 1;
1350 comparator
->comp
= watchpoint
->address
;
1351 target_write_u32(target
, comparator
->dwt_comparator_address
+ 0,
1354 comparator
->mask
= mask
;
1355 target_write_u32(target
, comparator
->dwt_comparator_address
+ 4,
1358 switch (watchpoint
->rw
) {
1360 comparator
->function
= 5;
1363 comparator
->function
= 6;
1366 comparator
->function
= 7;
1369 target_write_u32(target
, comparator
->dwt_comparator_address
+ 8,
1370 comparator
->function
);
1372 LOG_DEBUG("Watchpoint (ID %d) DWT%d 0x%08x 0x%x 0x%05x",
1373 watchpoint
->unique_id
, dwt_num
,
1374 (unsigned) comparator
->comp
,
1375 (unsigned) comparator
->mask
,
1376 (unsigned) comparator
->function
);
1380 int cortex_m_unset_watchpoint(struct target
*target
, struct watchpoint
*watchpoint
)
1382 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1383 struct cortex_m_dwt_comparator
*comparator
;
1386 if (!watchpoint
->set
) {
1387 LOG_WARNING("watchpoint (wpid: %d) not set",
1388 watchpoint
->unique_id
);
1392 dwt_num
= watchpoint
->set
- 1;
1394 LOG_DEBUG("Watchpoint (ID %d) DWT%d address: 0x%08x clear",
1395 watchpoint
->unique_id
, dwt_num
,
1396 (unsigned) watchpoint
->address
);
1398 if ((dwt_num
< 0) || (dwt_num
>= cortex_m
->dwt_num_comp
)) {
1399 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1403 comparator
= cortex_m
->dwt_comparator_list
+ dwt_num
;
1404 comparator
->used
= 0;
1405 comparator
->function
= 0;
1406 target_write_u32(target
, comparator
->dwt_comparator_address
+ 8,
1407 comparator
->function
);
1409 watchpoint
->set
= false;
1414 int cortex_m_add_watchpoint(struct target
*target
, struct watchpoint
*watchpoint
)
1416 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1418 if (cortex_m
->dwt_comp_available
< 1) {
1419 LOG_DEBUG("no comparators?");
1420 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1423 /* hardware doesn't support data value masking */
1424 if (watchpoint
->mask
!= ~(uint32_t)0) {
1425 LOG_DEBUG("watchpoint value masks not supported");
1426 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1429 /* hardware allows address masks of up to 32K */
1432 for (mask
= 0; mask
< 16; mask
++) {
1433 if ((1u << mask
) == watchpoint
->length
)
1437 LOG_DEBUG("unsupported watchpoint length");
1438 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1440 if (watchpoint
->address
& ((1 << mask
) - 1)) {
1441 LOG_DEBUG("watchpoint address is unaligned");
1442 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1445 /* Caller doesn't seem to be able to describe watching for data
1446 * values of zero; that flags "no value".
1448 * REVISIT This DWT may well be able to watch for specific data
1449 * values. Requires comparator #1 to set DATAVMATCH and match
1450 * the data, and another comparator (DATAVADDR0) matching addr.
1452 if (watchpoint
->value
) {
1453 LOG_DEBUG("data value watchpoint not YET supported");
1454 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
1457 cortex_m
->dwt_comp_available
--;
1458 LOG_DEBUG("dwt_comp_available: %d", cortex_m
->dwt_comp_available
);
1463 int cortex_m_remove_watchpoint(struct target
*target
, struct watchpoint
*watchpoint
)
1465 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1467 /* REVISIT why check? DWT can be updated with core running ... */
1468 if (target
->state
!= TARGET_HALTED
) {
1469 LOG_WARNING("target not halted");
1470 return ERROR_TARGET_NOT_HALTED
;
1473 if (watchpoint
->set
)
1474 cortex_m_unset_watchpoint(target
, watchpoint
);
1476 cortex_m
->dwt_comp_available
++;
1477 LOG_DEBUG("dwt_comp_available: %d", cortex_m
->dwt_comp_available
);
1482 void cortex_m_enable_watchpoints(struct target
*target
)
1484 struct watchpoint
*watchpoint
= target
->watchpoints
;
1486 /* set any pending watchpoints */
1487 while (watchpoint
) {
1488 if (!watchpoint
->set
)
1489 cortex_m_set_watchpoint(target
, watchpoint
);
1490 watchpoint
= watchpoint
->next
;
1494 static int cortex_m_load_core_reg_u32(struct target
*target
,
1495 uint32_t num
, uint32_t *value
)
1499 /* NOTE: we "know" here that the register identifiers used
1500 * in the v7m header match the Cortex-M3 Debug Core Register
1501 * Selector values for R0..R15, xPSR, MSP, and PSP.
1505 /* read a normal core register */
1506 retval
= cortexm_dap_read_coreregister_u32(target
, value
, num
);
1508 if (retval
!= ERROR_OK
) {
1509 LOG_ERROR("JTAG failure %i", retval
);
1510 return ERROR_JTAG_DEVICE_ERROR
;
1512 LOG_DEBUG("load from core reg %i value 0x%" PRIx32
"", (int)num
, *value
);
1516 /* Floating-point Status and Registers */
1517 retval
= target_write_u32(target
, DCB_DCRSR
, 0x21);
1518 if (retval
!= ERROR_OK
)
1520 retval
= target_read_u32(target
, DCB_DCRDR
, value
);
1521 if (retval
!= ERROR_OK
)
1523 LOG_DEBUG("load from FPSCR value 0x%" PRIx32
, *value
);
1526 case ARMV7M_S0
... ARMV7M_S31
:
1527 /* Floating-point Status and Registers */
1528 retval
= target_write_u32(target
, DCB_DCRSR
, num
- ARMV7M_S0
+ 0x40);
1529 if (retval
!= ERROR_OK
)
1531 retval
= target_read_u32(target
, DCB_DCRDR
, value
);
1532 if (retval
!= ERROR_OK
)
1534 LOG_DEBUG("load from FPU reg S%d value 0x%" PRIx32
,
1535 (int)(num
- ARMV7M_S0
), *value
);
1538 case ARMV7M_PRIMASK
:
1539 case ARMV7M_BASEPRI
:
1540 case ARMV7M_FAULTMASK
:
1541 case ARMV7M_CONTROL
:
1542 /* Cortex-M3 packages these four registers as bitfields
1543 * in one Debug Core register. So say r0 and r2 docs;
1544 * it was removed from r1 docs, but still works.
1546 cortexm_dap_read_coreregister_u32(target
, value
, 20);
1549 case ARMV7M_PRIMASK
:
1550 *value
= buf_get_u32((uint8_t *)value
, 0, 1);
1553 case ARMV7M_BASEPRI
:
1554 *value
= buf_get_u32((uint8_t *)value
, 8, 8);
1557 case ARMV7M_FAULTMASK
:
1558 *value
= buf_get_u32((uint8_t *)value
, 16, 1);
1561 case ARMV7M_CONTROL
:
1562 *value
= buf_get_u32((uint8_t *)value
, 24, 2);
1566 LOG_DEBUG("load from special reg %i value 0x%" PRIx32
"", (int)num
, *value
);
1570 return ERROR_COMMAND_SYNTAX_ERROR
;
1576 static int cortex_m_store_core_reg_u32(struct target
*target
,
1577 uint32_t num
, uint32_t value
)
1581 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1583 /* NOTE: we "know" here that the register identifiers used
1584 * in the v7m header match the Cortex-M3 Debug Core Register
1585 * Selector values for R0..R15, xPSR, MSP, and PSP.
1589 retval
= cortexm_dap_write_coreregister_u32(target
, value
, num
);
1590 if (retval
!= ERROR_OK
) {
1593 LOG_ERROR("JTAG failure");
1594 r
= armv7m
->arm
.core_cache
->reg_list
+ num
;
1595 r
->dirty
= r
->valid
;
1596 return ERROR_JTAG_DEVICE_ERROR
;
1598 LOG_DEBUG("write core reg %i value 0x%" PRIx32
"", (int)num
, value
);
1602 /* Floating-point Status and Registers */
1603 retval
= target_write_u32(target
, DCB_DCRDR
, value
);
1604 if (retval
!= ERROR_OK
)
1606 retval
= target_write_u32(target
, DCB_DCRSR
, 0x21 | (1<<16));
1607 if (retval
!= ERROR_OK
)
1609 LOG_DEBUG("write FPSCR value 0x%" PRIx32
, value
);
1612 case ARMV7M_S0
... ARMV7M_S31
:
1613 /* Floating-point Status and Registers */
1614 retval
= target_write_u32(target
, DCB_DCRDR
, value
);
1615 if (retval
!= ERROR_OK
)
1617 retval
= target_write_u32(target
, DCB_DCRSR
, (num
- ARMV7M_S0
+ 0x40) | (1<<16));
1618 if (retval
!= ERROR_OK
)
1620 LOG_DEBUG("write FPU reg S%d value 0x%" PRIx32
,
1621 (int)(num
- ARMV7M_S0
), value
);
1624 case ARMV7M_PRIMASK
:
1625 case ARMV7M_BASEPRI
:
1626 case ARMV7M_FAULTMASK
:
1627 case ARMV7M_CONTROL
:
1628 /* Cortex-M3 packages these four registers as bitfields
1629 * in one Debug Core register. So say r0 and r2 docs;
1630 * it was removed from r1 docs, but still works.
1632 cortexm_dap_read_coreregister_u32(target
, ®
, 20);
1635 case ARMV7M_PRIMASK
:
1636 buf_set_u32((uint8_t *)®
, 0, 1, value
);
1639 case ARMV7M_BASEPRI
:
1640 buf_set_u32((uint8_t *)®
, 8, 8, value
);
1643 case ARMV7M_FAULTMASK
:
1644 buf_set_u32((uint8_t *)®
, 16, 1, value
);
1647 case ARMV7M_CONTROL
:
1648 buf_set_u32((uint8_t *)®
, 24, 2, value
);
1652 cortexm_dap_write_coreregister_u32(target
, reg
, 20);
1654 LOG_DEBUG("write special reg %i value 0x%" PRIx32
" ", (int)num
, value
);
1658 return ERROR_COMMAND_SYNTAX_ERROR
;
1664 static int cortex_m_read_memory(struct target
*target
, target_addr_t address
,
1665 uint32_t size
, uint32_t count
, uint8_t *buffer
)
1667 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1669 if (armv7m
->arm
.is_armv6m
) {
1670 /* armv6m does not handle unaligned memory access */
1671 if (((size
== 4) && (address
& 0x3u
)) || ((size
== 2) && (address
& 0x1u
)))
1672 return ERROR_TARGET_UNALIGNED_ACCESS
;
1675 return mem_ap_read_buf(armv7m
->debug_ap
, buffer
, size
, count
, address
);
1678 static int cortex_m_write_memory(struct target
*target
, target_addr_t address
,
1679 uint32_t size
, uint32_t count
, const uint8_t *buffer
)
1681 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1683 if (armv7m
->arm
.is_armv6m
) {
1684 /* armv6m does not handle unaligned memory access */
1685 if (((size
== 4) && (address
& 0x3u
)) || ((size
== 2) && (address
& 0x1u
)))
1686 return ERROR_TARGET_UNALIGNED_ACCESS
;
1689 return mem_ap_write_buf(armv7m
->debug_ap
, buffer
, size
, count
, address
);
1692 static int cortex_m_init_target(struct command_context
*cmd_ctx
,
1693 struct target
*target
)
1695 armv7m_build_reg_cache(target
);
1696 arm_semihosting_init(target
);
1700 void cortex_m_deinit_target(struct target
*target
)
1702 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
1704 free(cortex_m
->fp_comparator_list
);
1706 cortex_m_dwt_free(target
);
1707 armv7m_free_reg_cache(target
);
1709 free(target
->private_config
);
1713 int cortex_m_profiling(struct target
*target
, uint32_t *samples
,
1714 uint32_t max_num_samples
, uint32_t *num_samples
, uint32_t seconds
)
1716 struct timeval timeout
, now
;
1717 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
1719 bool use_pcsr
= false;
1720 int retval
= ERROR_OK
;
1723 gettimeofday(&timeout
, NULL
);
1724 timeval_add_time(&timeout
, seconds
, 0);
1726 retval
= target_read_u32(target
, DWT_PCSR
, ®_value
);
1727 if (retval
!= ERROR_OK
) {
1728 LOG_ERROR("Error while reading PCSR");
1732 if (reg_value
!= 0) {
1734 LOG_INFO("Starting Cortex-M profiling. Sampling DWT_PCSR as fast as we can...");
1736 LOG_INFO("Starting profiling. Halting and resuming the"
1737 " target as often as we can...");
1738 reg
= register_get_by_name(target
->reg_cache
, "pc", 1);
1741 /* Make sure the target is running */
1742 target_poll(target
);
1743 if (target
->state
== TARGET_HALTED
)
1744 retval
= target_resume(target
, 1, 0, 0, 0);
1746 if (retval
!= ERROR_OK
) {
1747 LOG_ERROR("Error while resuming target");
1751 uint32_t sample_count
= 0;
1755 if (armv7m
&& armv7m
->debug_ap
) {
1756 uint32_t read_count
= max_num_samples
- sample_count
;
1757 if (read_count
> 1024)
1760 retval
= mem_ap_read_buf_noincr(armv7m
->debug_ap
,
1761 (void *)&samples
[sample_count
],
1762 4, read_count
, DWT_PCSR
);
1763 sample_count
+= read_count
;
1765 target_read_u32(target
, DWT_PCSR
, &samples
[sample_count
++]);
1768 target_poll(target
);
1769 if (target
->state
== TARGET_HALTED
) {
1770 reg_value
= buf_get_u32(reg
->value
, 0, 32);
1771 /* current pc, addr = 0, do not handle breakpoints, not debugging */
1772 retval
= target_resume(target
, 1, 0, 0, 0);
1773 samples
[sample_count
++] = reg_value
;
1774 target_poll(target
);
1775 alive_sleep(10); /* sleep 10ms, i.e. <100 samples/second. */
1776 } else if (target
->state
== TARGET_RUNNING
) {
1777 /* We want to quickly sample the PC. */
1778 retval
= target_halt(target
);
1780 LOG_INFO("Target not halted or running");
1786 if (retval
!= ERROR_OK
) {
1787 LOG_ERROR("Error while reading %s", use_pcsr
? "PCSR" : "target pc");
1792 gettimeofday(&now
, NULL
);
1793 if (sample_count
>= max_num_samples
|| timeval_compare(&now
, &timeout
) > 0) {
1794 LOG_INFO("Profiling completed. %" PRIu32
" samples.", sample_count
);
1799 *num_samples
= sample_count
;
1804 /* REVISIT cache valid/dirty bits are unmaintained. We could set "valid"
1805 * on r/w if the core is not running, and clear on resume or reset ... or
1806 * at least, in a post_restore_context() method.
1809 struct dwt_reg_state
{
1810 struct target
*target
;
1812 uint8_t value
[4]; /* scratch/cache */
1815 static int cortex_m_dwt_get_reg(struct reg
*reg
)
1817 struct dwt_reg_state
*state
= reg
->arch_info
;
1820 int retval
= target_read_u32(state
->target
, state
->addr
, &tmp
);
1821 if (retval
!= ERROR_OK
)
1824 buf_set_u32(state
->value
, 0, 32, tmp
);
1828 static int cortex_m_dwt_set_reg(struct reg
*reg
, uint8_t *buf
)
1830 struct dwt_reg_state
*state
= reg
->arch_info
;
1832 return target_write_u32(state
->target
, state
->addr
,
1833 buf_get_u32(buf
, 0, reg
->size
));
1842 static const struct dwt_reg dwt_base_regs
[] = {
1843 { DWT_CTRL
, "dwt_ctrl", 32, },
1844 /* NOTE that Erratum 532314 (fixed r2p0) affects CYCCNT: it wrongly
1845 * increments while the core is asleep.
1847 { DWT_CYCCNT
, "dwt_cyccnt", 32, },
1848 /* plus some 8 bit counters, useful for profiling with TPIU */
1851 static const struct dwt_reg dwt_comp
[] = {
1852 #define DWT_COMPARATOR(i) \
1853 { DWT_COMP0 + 0x10 * (i), "dwt_" #i "_comp", 32, }, \
1854 { DWT_MASK0 + 0x10 * (i), "dwt_" #i "_mask", 4, }, \
1855 { DWT_FUNCTION0 + 0x10 * (i), "dwt_" #i "_function", 32, }
1872 #undef DWT_COMPARATOR
1875 static const struct reg_arch_type dwt_reg_type
= {
1876 .get
= cortex_m_dwt_get_reg
,
1877 .set
= cortex_m_dwt_set_reg
,
1880 static void cortex_m_dwt_addreg(struct target
*t
, struct reg
*r
, const struct dwt_reg
*d
)
1882 struct dwt_reg_state
*state
;
1884 state
= calloc(1, sizeof *state
);
1887 state
->addr
= d
->addr
;
1892 r
->value
= state
->value
;
1893 r
->arch_info
= state
;
1894 r
->type
= &dwt_reg_type
;
1897 void cortex_m_dwt_setup(struct cortex_m_common
*cm
, struct target
*target
)
1900 struct reg_cache
*cache
;
1901 struct cortex_m_dwt_comparator
*comparator
;
1904 target_read_u32(target
, DWT_CTRL
, &dwtcr
);
1905 LOG_DEBUG("DWT_CTRL: 0x%" PRIx32
, dwtcr
);
1907 LOG_DEBUG("no DWT");
1911 cm
->dwt_num_comp
= (dwtcr
>> 28) & 0xF;
1912 cm
->dwt_comp_available
= cm
->dwt_num_comp
;
1913 cm
->dwt_comparator_list
= calloc(cm
->dwt_num_comp
,
1914 sizeof(struct cortex_m_dwt_comparator
));
1915 if (!cm
->dwt_comparator_list
) {
1917 cm
->dwt_num_comp
= 0;
1918 LOG_ERROR("out of mem");
1922 cache
= calloc(1, sizeof *cache
);
1925 free(cm
->dwt_comparator_list
);
1928 cache
->name
= "Cortex-M DWT registers";
1929 cache
->num_regs
= 2 + cm
->dwt_num_comp
* 3;
1930 cache
->reg_list
= calloc(cache
->num_regs
, sizeof *cache
->reg_list
);
1931 if (!cache
->reg_list
) {
1936 for (reg
= 0; reg
< 2; reg
++)
1937 cortex_m_dwt_addreg(target
, cache
->reg_list
+ reg
,
1938 dwt_base_regs
+ reg
);
1940 comparator
= cm
->dwt_comparator_list
;
1941 for (i
= 0; i
< cm
->dwt_num_comp
; i
++, comparator
++) {
1944 comparator
->dwt_comparator_address
= DWT_COMP0
+ 0x10 * i
;
1945 for (j
= 0; j
< 3; j
++, reg
++)
1946 cortex_m_dwt_addreg(target
, cache
->reg_list
+ reg
,
1947 dwt_comp
+ 3 * i
+ j
);
1949 /* make sure we clear any watchpoints enabled on the target */
1950 target_write_u32(target
, comparator
->dwt_comparator_address
+ 8, 0);
1953 *register_get_last_cache_p(&target
->reg_cache
) = cache
;
1954 cm
->dwt_cache
= cache
;
1956 LOG_DEBUG("DWT dwtcr 0x%" PRIx32
", comp %d, watch%s",
1957 dwtcr
, cm
->dwt_num_comp
,
1958 (dwtcr
& (0xf << 24)) ? " only" : "/trigger");
1960 /* REVISIT: if num_comp > 1, check whether comparator #1 can
1961 * implement single-address data value watchpoints ... so we
1962 * won't need to check it later, when asked to set one up.
1966 static void cortex_m_dwt_free(struct target
*target
)
1968 struct cortex_m_common
*cm
= target_to_cm(target
);
1969 struct reg_cache
*cache
= cm
->dwt_cache
;
1971 free(cm
->dwt_comparator_list
);
1972 cm
->dwt_comparator_list
= NULL
;
1973 cm
->dwt_num_comp
= 0;
1976 register_unlink_cache(&target
->reg_cache
, cache
);
1978 if (cache
->reg_list
) {
1979 for (size_t i
= 0; i
< cache
->num_regs
; i
++)
1980 free(cache
->reg_list
[i
].arch_info
);
1981 free(cache
->reg_list
);
1985 cm
->dwt_cache
= NULL
;
1988 #define MVFR0 0xe000ef40
1989 #define MVFR1 0xe000ef44
1991 #define MVFR0_DEFAULT_M4 0x10110021
1992 #define MVFR1_DEFAULT_M4 0x11000011
1994 #define MVFR0_DEFAULT_M7_SP 0x10110021
1995 #define MVFR0_DEFAULT_M7_DP 0x10110221
1996 #define MVFR1_DEFAULT_M7_SP 0x11000011
1997 #define MVFR1_DEFAULT_M7_DP 0x12000011
1999 int cortex_m_examine(struct target
*target
)
2002 uint32_t cpuid
, fpcr
, mvfr0
, mvfr1
;
2004 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
2005 struct adiv5_dap
*swjdp
= cortex_m
->armv7m
.arm
.dap
;
2006 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
2008 /* stlink shares the examine handler but does not support
2010 if (!armv7m
->stlink
) {
2011 if (cortex_m
->apsel
== DP_APSEL_INVALID
) {
2012 /* Search for the MEM-AP */
2013 retval
= dap_find_ap(swjdp
, AP_TYPE_AHB_AP
, &armv7m
->debug_ap
);
2014 if (retval
!= ERROR_OK
) {
2015 LOG_ERROR("Could not find MEM-AP to control the core");
2019 armv7m
->debug_ap
= dap_ap(swjdp
, cortex_m
->apsel
);
2022 /* Leave (only) generic DAP stuff for debugport_init(); */
2023 armv7m
->debug_ap
->memaccess_tck
= 8;
2025 retval
= mem_ap_init(armv7m
->debug_ap
);
2026 if (retval
!= ERROR_OK
)
2030 if (!target_was_examined(target
)) {
2031 target_set_examined(target
);
2033 /* Read from Device Identification Registers */
2034 retval
= target_read_u32(target
, CPUID
, &cpuid
);
2035 if (retval
!= ERROR_OK
)
2039 i
= (cpuid
>> 4) & 0xf;
2041 LOG_DEBUG("Cortex-M%d r%" PRId8
"p%" PRId8
" processor detected",
2042 i
, (uint8_t)((cpuid
>> 20) & 0xf), (uint8_t)((cpuid
>> 0) & 0xf));
2045 rev
= (cpuid
>> 20) & 0xf;
2046 patch
= (cpuid
>> 0) & 0xf;
2047 if ((rev
== 0) && (patch
< 2))
2048 LOG_WARNING("Silicon bug: single stepping will enter pending exception handler!");
2050 LOG_DEBUG("cpuid: 0x%8.8" PRIx32
"", cpuid
);
2052 /* VECTRESET is not supported on Cortex-M0, M0+ and M1 */
2053 cortex_m
->vectreset_supported
= i
> 1;
2056 target_read_u32(target
, MVFR0
, &mvfr0
);
2057 target_read_u32(target
, MVFR1
, &mvfr1
);
2059 /* test for floating point feature on Cortex-M4 */
2060 if ((mvfr0
== MVFR0_DEFAULT_M4
) && (mvfr1
== MVFR1_DEFAULT_M4
)) {
2061 LOG_DEBUG("Cortex-M%d floating point feature FPv4_SP found", i
);
2062 armv7m
->fp_feature
= FPv4_SP
;
2064 } else if (i
== 7) {
2065 target_read_u32(target
, MVFR0
, &mvfr0
);
2066 target_read_u32(target
, MVFR1
, &mvfr1
);
2068 /* test for floating point features on Cortex-M7 */
2069 if ((mvfr0
== MVFR0_DEFAULT_M7_SP
) && (mvfr1
== MVFR1_DEFAULT_M7_SP
)) {
2070 LOG_DEBUG("Cortex-M%d floating point feature FPv5_SP found", i
);
2071 armv7m
->fp_feature
= FPv5_SP
;
2072 } else if ((mvfr0
== MVFR0_DEFAULT_M7_DP
) && (mvfr1
== MVFR1_DEFAULT_M7_DP
)) {
2073 LOG_DEBUG("Cortex-M%d floating point feature FPv5_DP found", i
);
2074 armv7m
->fp_feature
= FPv5_DP
;
2076 } else if (i
== 0) {
2077 /* Cortex-M0 does not support unaligned memory access */
2078 armv7m
->arm
.is_armv6m
= true;
2081 if (armv7m
->fp_feature
== FP_NONE
&&
2082 armv7m
->arm
.core_cache
->num_regs
> ARMV7M_NUM_CORE_REGS_NOFP
) {
2083 /* free unavailable FPU registers */
2086 for (idx
= ARMV7M_NUM_CORE_REGS_NOFP
;
2087 idx
< armv7m
->arm
.core_cache
->num_regs
;
2089 free(armv7m
->arm
.core_cache
->reg_list
[idx
].value
);
2090 free(armv7m
->arm
.core_cache
->reg_list
[idx
].feature
);
2091 free(armv7m
->arm
.core_cache
->reg_list
[idx
].reg_data_type
);
2093 armv7m
->arm
.core_cache
->num_regs
= ARMV7M_NUM_CORE_REGS_NOFP
;
2096 if (!armv7m
->stlink
) {
2097 if (i
== 3 || i
== 4)
2098 /* Cortex-M3/M4 have 4096 bytes autoincrement range,
2099 * s. ARM IHI 0031C: MEM-AP 7.2.2 */
2100 armv7m
->debug_ap
->tar_autoincr_block
= (1 << 12);
2102 /* Cortex-M7 has only 1024 bytes autoincrement range */
2103 armv7m
->debug_ap
->tar_autoincr_block
= (1 << 10);
2106 /* Configure trace modules */
2107 retval
= target_write_u32(target
, DCB_DEMCR
, TRCENA
| armv7m
->demcr
);
2108 if (retval
!= ERROR_OK
)
2111 if (armv7m
->trace_config
.config_type
!= TRACE_CONFIG_TYPE_DISABLED
) {
2112 armv7m_trace_tpiu_config(target
);
2113 armv7m_trace_itm_config(target
);
2116 /* NOTE: FPB and DWT are both optional. */
2119 target_read_u32(target
, FP_CTRL
, &fpcr
);
2120 /* bits [14:12] and [7:4] */
2121 cortex_m
->fp_num_code
= ((fpcr
>> 8) & 0x70) | ((fpcr
>> 4) & 0xF);
2122 cortex_m
->fp_num_lit
= (fpcr
>> 8) & 0xF;
2123 cortex_m
->fp_code_available
= cortex_m
->fp_num_code
;
2124 /* Detect flash patch revision, see RM DDI 0403E.b page C1-817.
2125 Revision is zero base, fp_rev == 1 means Rev.2 ! */
2126 cortex_m
->fp_rev
= (fpcr
>> 28) & 0xf;
2127 free(cortex_m
->fp_comparator_list
);
2128 cortex_m
->fp_comparator_list
= calloc(
2129 cortex_m
->fp_num_code
+ cortex_m
->fp_num_lit
,
2130 sizeof(struct cortex_m_fp_comparator
));
2131 cortex_m
->fpb_enabled
= fpcr
& 1;
2132 for (i
= 0; i
< cortex_m
->fp_num_code
+ cortex_m
->fp_num_lit
; i
++) {
2133 cortex_m
->fp_comparator_list
[i
].type
=
2134 (i
< cortex_m
->fp_num_code
) ? FPCR_CODE
: FPCR_LITERAL
;
2135 cortex_m
->fp_comparator_list
[i
].fpcr_address
= FP_COMP0
+ 4 * i
;
2137 /* make sure we clear any breakpoints enabled on the target */
2138 target_write_u32(target
, cortex_m
->fp_comparator_list
[i
].fpcr_address
, 0);
2140 LOG_DEBUG("FPB fpcr 0x%" PRIx32
", numcode %i, numlit %i",
2142 cortex_m
->fp_num_code
,
2143 cortex_m
->fp_num_lit
);
2146 cortex_m_dwt_free(target
);
2147 cortex_m_dwt_setup(cortex_m
, target
);
2149 /* These hardware breakpoints only work for code in flash! */
2150 LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
2151 target_name(target
),
2152 cortex_m
->fp_num_code
,
2153 cortex_m
->dwt_num_comp
);
2159 static int cortex_m_dcc_read(struct target
*target
, uint8_t *value
, uint8_t *ctrl
)
2161 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
2166 retval
= mem_ap_read_buf_noincr(armv7m
->debug_ap
, buf
, 2, 1, DCB_DCRDR
);
2167 if (retval
!= ERROR_OK
)
2170 dcrdr
= target_buffer_get_u16(target
, buf
);
2171 *ctrl
= (uint8_t)dcrdr
;
2172 *value
= (uint8_t)(dcrdr
>> 8);
2174 LOG_DEBUG("data 0x%x ctrl 0x%x", *value
, *ctrl
);
2176 /* write ack back to software dcc register
2177 * signify we have read data */
2178 if (dcrdr
& (1 << 0)) {
2179 target_buffer_set_u16(target
, buf
, 0);
2180 retval
= mem_ap_write_buf_noincr(armv7m
->debug_ap
, buf
, 2, 1, DCB_DCRDR
);
2181 if (retval
!= ERROR_OK
)
2188 static int cortex_m_target_request_data(struct target
*target
,
2189 uint32_t size
, uint8_t *buffer
)
2195 for (i
= 0; i
< (size
* 4); i
++) {
2196 int retval
= cortex_m_dcc_read(target
, &data
, &ctrl
);
2197 if (retval
!= ERROR_OK
)
2205 static int cortex_m_handle_target_request(void *priv
)
2207 struct target
*target
= priv
;
2208 if (!target_was_examined(target
))
2211 if (!target
->dbg_msg_enabled
)
2214 if (target
->state
== TARGET_RUNNING
) {
2219 retval
= cortex_m_dcc_read(target
, &data
, &ctrl
);
2220 if (retval
!= ERROR_OK
)
2223 /* check if we have data */
2224 if (ctrl
& (1 << 0)) {
2227 /* we assume target is quick enough */
2229 for (int i
= 1; i
<= 3; i
++) {
2230 retval
= cortex_m_dcc_read(target
, &data
, &ctrl
);
2231 if (retval
!= ERROR_OK
)
2233 request
|= ((uint32_t)data
<< (i
* 8));
2235 target_request(target
, request
);
2242 static int cortex_m_init_arch_info(struct target
*target
,
2243 struct cortex_m_common
*cortex_m
, struct adiv5_dap
*dap
)
2245 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
2247 armv7m_init_arch_info(target
, armv7m
);
2249 /* default reset mode is to use srst if fitted
2250 * if not it will use CORTEX_M3_RESET_VECTRESET */
2251 cortex_m
->soft_reset_config
= CORTEX_M_RESET_VECTRESET
;
2253 armv7m
->arm
.dap
= dap
;
2255 /* register arch-specific functions */
2256 armv7m
->examine_debug_reason
= cortex_m_examine_debug_reason
;
2258 armv7m
->post_debug_entry
= NULL
;
2260 armv7m
->pre_restore_context
= NULL
;
2262 armv7m
->load_core_reg_u32
= cortex_m_load_core_reg_u32
;
2263 armv7m
->store_core_reg_u32
= cortex_m_store_core_reg_u32
;
2265 target_register_timer_callback(cortex_m_handle_target_request
, 1, 1, target
);
2270 static int cortex_m_target_create(struct target
*target
, Jim_Interp
*interp
)
2272 struct cortex_m_common
*cortex_m
= calloc(1, sizeof(struct cortex_m_common
));
2273 cortex_m
->common_magic
= CORTEX_M_COMMON_MAGIC
;
2274 struct adiv5_private_config
*pc
;
2276 pc
= (struct adiv5_private_config
*)target
->private_config
;
2277 if (adiv5_verify_config(pc
) != ERROR_OK
)
2280 cortex_m
->apsel
= pc
->ap_num
;
2282 cortex_m_init_arch_info(target
, cortex_m
, pc
->dap
);
2287 /*--------------------------------------------------------------------------*/
2289 static int cortex_m_verify_pointer(struct command_context
*cmd_ctx
,
2290 struct cortex_m_common
*cm
)
2292 if (cm
->common_magic
!= CORTEX_M_COMMON_MAGIC
) {
2293 command_print(cmd_ctx
, "target is not a Cortex-M");
2294 return ERROR_TARGET_INVALID
;
2300 * Only stuff below this line should need to verify that its target
2301 * is a Cortex-M3. Everything else should have indirected through the
2302 * cortexm3_target structure, which is only used with CM3 targets.
2305 COMMAND_HANDLER(handle_cortex_m_vector_catch_command
)
2307 struct target
*target
= get_current_target(CMD_CTX
);
2308 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
2309 struct armv7m_common
*armv7m
= &cortex_m
->armv7m
;
2313 static const struct {
2317 { "hard_err", VC_HARDERR
, },
2318 { "int_err", VC_INTERR
, },
2319 { "bus_err", VC_BUSERR
, },
2320 { "state_err", VC_STATERR
, },
2321 { "chk_err", VC_CHKERR
, },
2322 { "nocp_err", VC_NOCPERR
, },
2323 { "mm_err", VC_MMERR
, },
2324 { "reset", VC_CORERESET
, },
2327 retval
= cortex_m_verify_pointer(CMD_CTX
, cortex_m
);
2328 if (retval
!= ERROR_OK
)
2331 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DEMCR
, &demcr
);
2332 if (retval
!= ERROR_OK
)
2338 if (CMD_ARGC
== 1) {
2339 if (strcmp(CMD_ARGV
[0], "all") == 0) {
2340 catch = VC_HARDERR
| VC_INTERR
| VC_BUSERR
2341 | VC_STATERR
| VC_CHKERR
| VC_NOCPERR
2342 | VC_MMERR
| VC_CORERESET
;
2344 } else if (strcmp(CMD_ARGV
[0], "none") == 0)
2347 while (CMD_ARGC
-- > 0) {
2349 for (i
= 0; i
< ARRAY_SIZE(vec_ids
); i
++) {
2350 if (strcmp(CMD_ARGV
[CMD_ARGC
], vec_ids
[i
].name
) != 0)
2352 catch |= vec_ids
[i
].mask
;
2355 if (i
== ARRAY_SIZE(vec_ids
)) {
2356 LOG_ERROR("No CM3 vector '%s'", CMD_ARGV
[CMD_ARGC
]);
2357 return ERROR_COMMAND_SYNTAX_ERROR
;
2361 /* For now, armv7m->demcr only stores vector catch flags. */
2362 armv7m
->demcr
= catch;
2367 /* write, but don't assume it stuck (why not??) */
2368 retval
= mem_ap_write_u32(armv7m
->debug_ap
, DCB_DEMCR
, demcr
);
2369 if (retval
!= ERROR_OK
)
2371 retval
= mem_ap_read_atomic_u32(armv7m
->debug_ap
, DCB_DEMCR
, &demcr
);
2372 if (retval
!= ERROR_OK
)
2375 /* FIXME be sure to clear DEMCR on clean server shutdown.
2376 * Otherwise the vector catch hardware could fire when there's
2377 * no debugger hooked up, causing much confusion...
2381 for (unsigned i
= 0; i
< ARRAY_SIZE(vec_ids
); i
++) {
2382 command_print(CMD_CTX
, "%9s: %s", vec_ids
[i
].name
,
2383 (demcr
& vec_ids
[i
].mask
) ? "catch" : "ignore");
2389 COMMAND_HANDLER(handle_cortex_m_mask_interrupts_command
)
2391 struct target
*target
= get_current_target(CMD_CTX
);
2392 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
2395 static const Jim_Nvp nvp_maskisr_modes
[] = {
2396 { .name
= "auto", .value
= CORTEX_M_ISRMASK_AUTO
},
2397 { .name
= "off", .value
= CORTEX_M_ISRMASK_OFF
},
2398 { .name
= "on", .value
= CORTEX_M_ISRMASK_ON
},
2399 { .name
= NULL
, .value
= -1 },
2404 retval
= cortex_m_verify_pointer(CMD_CTX
, cortex_m
);
2405 if (retval
!= ERROR_OK
)
2408 if (target
->state
!= TARGET_HALTED
) {
2409 command_print(CMD_CTX
, "target must be stopped for \"%s\" command", CMD_NAME
);
2414 n
= Jim_Nvp_name2value_simple(nvp_maskisr_modes
, CMD_ARGV
[0]);
2415 if (n
->name
== NULL
)
2416 return ERROR_COMMAND_SYNTAX_ERROR
;
2417 cortex_m
->isrmasking_mode
= n
->value
;
2420 if (cortex_m
->isrmasking_mode
== CORTEX_M_ISRMASK_ON
)
2421 cortex_m_write_debug_halt_mask(target
, C_HALT
| C_MASKINTS
, 0);
2423 cortex_m_write_debug_halt_mask(target
, C_HALT
, C_MASKINTS
);
2426 n
= Jim_Nvp_value2name_simple(nvp_maskisr_modes
, cortex_m
->isrmasking_mode
);
2427 command_print(CMD_CTX
, "cortex_m interrupt mask %s", n
->name
);
2432 COMMAND_HANDLER(handle_cortex_m_reset_config_command
)
2434 struct target
*target
= get_current_target(CMD_CTX
);
2435 struct cortex_m_common
*cortex_m
= target_to_cm(target
);
2439 retval
= cortex_m_verify_pointer(CMD_CTX
, cortex_m
);
2440 if (retval
!= ERROR_OK
)
2444 if (strcmp(*CMD_ARGV
, "sysresetreq") == 0)
2445 cortex_m
->soft_reset_config
= CORTEX_M_RESET_SYSRESETREQ
;
2447 else if (strcmp(*CMD_ARGV
, "vectreset") == 0) {
2448 if (target_was_examined(target
)
2449 && !cortex_m
->vectreset_supported
)
2450 LOG_WARNING("VECTRESET is not supported on your Cortex-M core!");
2452 cortex_m
->soft_reset_config
= CORTEX_M_RESET_VECTRESET
;
2455 return ERROR_COMMAND_SYNTAX_ERROR
;
2458 switch (cortex_m
->soft_reset_config
) {
2459 case CORTEX_M_RESET_SYSRESETREQ
:
2460 reset_config
= "sysresetreq";
2463 case CORTEX_M_RESET_VECTRESET
:
2464 reset_config
= "vectreset";
2468 reset_config
= "unknown";
2472 command_print(CMD_CTX
, "cortex_m reset_config %s", reset_config
);
2477 static const struct command_registration cortex_m_exec_command_handlers
[] = {
2480 .handler
= handle_cortex_m_mask_interrupts_command
,
2481 .mode
= COMMAND_EXEC
,
2482 .help
= "mask cortex_m interrupts",
2483 .usage
= "['auto'|'on'|'off']",
2486 .name
= "vector_catch",
2487 .handler
= handle_cortex_m_vector_catch_command
,
2488 .mode
= COMMAND_EXEC
,
2489 .help
= "configure hardware vectors to trigger debug entry",
2490 .usage
= "['all'|'none'|('bus_err'|'chk_err'|...)*]",
2493 .name
= "reset_config",
2494 .handler
= handle_cortex_m_reset_config_command
,
2495 .mode
= COMMAND_ANY
,
2496 .help
= "configure software reset handling",
2497 .usage
= "['sysresetreq'|'vectreset']",
2499 COMMAND_REGISTRATION_DONE
2501 static const struct command_registration cortex_m_command_handlers
[] = {
2503 .chain
= armv7m_command_handlers
,
2506 .chain
= armv7m_trace_command_handlers
,
2510 .mode
= COMMAND_EXEC
,
2511 .help
= "Cortex-M command group",
2513 .chain
= cortex_m_exec_command_handlers
,
2515 COMMAND_REGISTRATION_DONE
2518 struct target_type cortexm_target
= {
2520 .deprecated_name
= "cortex_m3",
2522 .poll
= cortex_m_poll
,
2523 .arch_state
= armv7m_arch_state
,
2525 .target_request_data
= cortex_m_target_request_data
,
2527 .halt
= cortex_m_halt
,
2528 .resume
= cortex_m_resume
,
2529 .step
= cortex_m_step
,
2531 .assert_reset
= cortex_m_assert_reset
,
2532 .deassert_reset
= cortex_m_deassert_reset
,
2533 .soft_reset_halt
= cortex_m_soft_reset_halt
,
2535 .get_gdb_arch
= arm_get_gdb_arch
,
2536 .get_gdb_reg_list
= armv7m_get_gdb_reg_list
,
2538 .read_memory
= cortex_m_read_memory
,
2539 .write_memory
= cortex_m_write_memory
,
2540 .checksum_memory
= armv7m_checksum_memory
,
2541 .blank_check_memory
= armv7m_blank_check_memory
,
2543 .run_algorithm
= armv7m_run_algorithm
,
2544 .start_algorithm
= armv7m_start_algorithm
,
2545 .wait_algorithm
= armv7m_wait_algorithm
,
2547 .add_breakpoint
= cortex_m_add_breakpoint
,
2548 .remove_breakpoint
= cortex_m_remove_breakpoint
,
2549 .add_watchpoint
= cortex_m_add_watchpoint
,
2550 .remove_watchpoint
= cortex_m_remove_watchpoint
,
2552 .commands
= cortex_m_command_handlers
,
2553 .target_create
= cortex_m_target_create
,
2554 .target_jim_configure
= adiv5_jim_configure
,
2555 .init_target
= cortex_m_init_target
,
2556 .examine
= cortex_m_examine
,
2557 .deinit_target
= cortex_m_deinit_target
,
2559 .profiling
= cortex_m_profiling
,