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helper/jim-eventloop: review scope of symbols
[openocd/dnglaze.git] / src / target / cortex_m3.c
blob7f6cbafa522b3f2ccd062a933bfe9211e2932c50
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2006 by Magnus Lundin *
6 * lundin@mlu.mine.nu *
7 * *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
10 * *
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. *
15 * *
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. *
20 * *
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 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 * *
26 * *
27 * Cortex-M3(tm) TRM, ARM DDI 0337E (r1p1) and 0337G (r2p0) *
28 * *
29 ***************************************************************************/
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #include "breakpoints.h"
35 #include "cortex_m3.h"
36 #include "target_request.h"
37 #include "target_type.h"
38 #include "arm_disassembler.h"
39 #include "register.h"
40 #include "arm_opcodes.h"
41 #include "arm_semihosting.h"
42
43 /* NOTE: most of this should work fine for the Cortex-M1 and
44 * Cortex-M0 cores too, although they're ARMv6-M not ARMv7-M.
45 * Some differences: M0/M1 doesn't have FBP remapping or the
46 * DWT tracing/profiling support. (So the cycle counter will
47 * not be usable; the other stuff isn't currently used here.)
48 *
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
51 * any longer.
52 */
53
54
55 /* forward declarations */
56 static int cortex_m3_set_breakpoint(struct target *target, struct breakpoint *breakpoint);
57 static int cortex_m3_unset_breakpoint(struct target *target, struct breakpoint *breakpoint);
58 static void cortex_m3_enable_watchpoints(struct target *target);
59 static int cortex_m3_store_core_reg_u32(struct target *target,
60 enum armv7m_regtype type, uint32_t num, uint32_t value);
61
62 static int cortexm3_dap_read_coreregister_u32(struct adiv5_dap *swjdp,
63 uint32_t *value, int regnum)
64 {
65 int retval;
66 uint32_t dcrdr;
67
68 /* because the DCB_DCRDR is used for the emulated dcc channel
69 * we have to save/restore the DCB_DCRDR when used */
70
71 mem_ap_read_u32(swjdp, DCB_DCRDR, &dcrdr);
72
73 /* mem_ap_write_u32(swjdp, DCB_DCRSR, regnum); */
74 dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRSR & 0xFFFFFFF0);
75 retval = dap_queue_ap_write(swjdp, AP_REG_BD0 | (DCB_DCRSR & 0xC), regnum);
76 if (retval != ERROR_OK)
77 return retval;
78
79 /* mem_ap_read_u32(swjdp, DCB_DCRDR, value); */
80 dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRDR & 0xFFFFFFF0);
81 retval = dap_queue_ap_read(swjdp, AP_REG_BD0 | (DCB_DCRDR & 0xC), value);
82 if (retval != ERROR_OK)
83 return retval;
84
85 retval = dap_run(swjdp);
86 if (retval != ERROR_OK)
87 return retval;
88
89 /* restore DCB_DCRDR - this needs to be in a seperate
90 * transaction otherwise the emulated DCC channel breaks */
91 if (retval == ERROR_OK)
92 retval = mem_ap_write_atomic_u32(swjdp, DCB_DCRDR, dcrdr);
93
94 return retval;
95 }
96
97 static int cortexm3_dap_write_coreregister_u32(struct adiv5_dap *swjdp,
98 uint32_t value, int regnum)
99 {
100 int retval;
101 uint32_t dcrdr;
102
103 /* because the DCB_DCRDR is used for the emulated dcc channel
104 * we have to save/restore the DCB_DCRDR when used */
105
106 mem_ap_read_u32(swjdp, DCB_DCRDR, &dcrdr);
107
108 /* mem_ap_write_u32(swjdp, DCB_DCRDR, core_regs[i]); */
109 dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRDR & 0xFFFFFFF0);
110 retval = dap_queue_ap_write(swjdp, AP_REG_BD0 | (DCB_DCRDR & 0xC), value);
111 // XXX check retval
112
113 /* mem_ap_write_u32(swjdp, DCB_DCRSR, i | DCRSR_WnR); */
114 dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRSR & 0xFFFFFFF0);
115 retval = dap_queue_ap_write(swjdp, AP_REG_BD0 | (DCB_DCRSR & 0xC), regnum | DCRSR_WnR);
116 // XXX check retval
117
118 retval = dap_run(swjdp);
119
120 /* restore DCB_DCRDR - this needs to be in a seperate
121 * transaction otherwise the emulated DCC channel breaks */
122 if (retval == ERROR_OK)
123 retval = mem_ap_write_atomic_u32(swjdp, DCB_DCRDR, dcrdr);
124
125 return retval;
126 }
127
128 static int cortex_m3_write_debug_halt_mask(struct target *target,
129 uint32_t mask_on, uint32_t mask_off)
130 {
131 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
132 struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
133
134 /* mask off status bits */
135 cortex_m3->dcb_dhcsr &= ~((0xFFFF << 16) | mask_off);
136 /* create new register mask */
137 cortex_m3->dcb_dhcsr |= DBGKEY | C_DEBUGEN | mask_on;
138
139 return mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, cortex_m3->dcb_dhcsr);
140 }
141
142 static int cortex_m3_clear_halt(struct target *target)
143 {
144 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
145 struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
146
147 /* clear step if any */
148 cortex_m3_write_debug_halt_mask(target, C_HALT, C_STEP);
149
150 /* Read Debug Fault Status Register */
151 mem_ap_read_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
152
153 /* Clear Debug Fault Status */
154 mem_ap_write_atomic_u32(swjdp, NVIC_DFSR, cortex_m3->nvic_dfsr);
155 LOG_DEBUG(" NVIC_DFSR 0x%" PRIx32 "", cortex_m3->nvic_dfsr);
156
157 return ERROR_OK;
158 }
159
160 static int cortex_m3_single_step_core(struct target *target)
161 {
162 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
163 struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
164 uint32_t dhcsr_save;
165
166 /* backup dhcsr reg */
167 dhcsr_save = cortex_m3->dcb_dhcsr;
168
169 /* Mask interrupts before clearing halt, if done already. This avoids
170 * Erratum 377497 (fixed in r1p0) where setting MASKINTS while clearing
171 * HALT can put the core into an unknown state.
172 */
173 if (!(cortex_m3->dcb_dhcsr & C_MASKINTS))
174 mem_ap_write_atomic_u32(swjdp, DCB_DHCSR,
175 DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN);
176 mem_ap_write_atomic_u32(swjdp, DCB_DHCSR,
177 DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN);
178 LOG_DEBUG(" ");
179
180 /* restore dhcsr reg */
181 cortex_m3->dcb_dhcsr = dhcsr_save;
182 cortex_m3_clear_halt(target);
183
184 return ERROR_OK;
185 }
186
187 static int cortex_m3_endreset_event(struct target *target)
188 {
189 int i;
190 int retval;
191 uint32_t dcb_demcr;
192 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
193 struct armv7m_common *armv7m = &cortex_m3->armv7m;
194 struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
195 struct cortex_m3_fp_comparator *fp_list = cortex_m3->fp_comparator_list;
196 struct cortex_m3_dwt_comparator *dwt_list = cortex_m3->dwt_comparator_list;
197
198 /* REVISIT The four debug monitor bits are currently ignored... */
199 mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &dcb_demcr);
200 LOG_DEBUG("DCB_DEMCR = 0x%8.8" PRIx32 "",dcb_demcr);
201
202 /* this register is used for emulated dcc channel */
203 mem_ap_write_u32(swjdp, DCB_DCRDR, 0);
204
205 /* Enable debug requests */
206 mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
207 if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
208 mem_ap_write_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN);
209
210 /* clear any interrupt masking */
211 cortex_m3_write_debug_halt_mask(target, 0, C_MASKINTS);
212
213 /* Enable features controlled by ITM and DWT blocks, and catch only
214 * the vectors we were told to pay attention to.
215 *
216 * Target firmware is responsible for all fault handling policy
217 * choices *EXCEPT* explicitly scripted overrides like "vector_catch"
218 * or manual updates to the NVIC SHCSR and CCR registers.
219 */
220 mem_ap_write_u32(swjdp, DCB_DEMCR, TRCENA | armv7m->demcr);
221
222 /* Paranoia: evidently some (early?) chips don't preserve all the
223 * debug state (including FBP, DWT, etc) across reset...
224 */
225
226 /* Enable FPB */
227 target_write_u32(target, FP_CTRL, 3);
228 cortex_m3->fpb_enabled = 1;
229
230 /* Restore FPB registers */
231 for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
232 {
233 target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
234 }
235
236 /* Restore DWT registers */
237 for (i = 0; i < cortex_m3->dwt_num_comp; i++)
238 {
239 target_write_u32(target, dwt_list[i].dwt_comparator_address + 0,
240 dwt_list[i].comp);
241 target_write_u32(target, dwt_list[i].dwt_comparator_address + 4,
242 dwt_list[i].mask);
243 target_write_u32(target, dwt_list[i].dwt_comparator_address + 8,
244 dwt_list[i].function);
245 }
246 retval = dap_run(swjdp);
247 if (retval != ERROR_OK)
248 return retval;
249
250 register_cache_invalidate(cortex_m3->armv7m.core_cache);
251
252 /* make sure we have latest dhcsr flags */
253 mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
254
255 return retval;
256 }
257
258 static int cortex_m3_examine_debug_reason(struct target *target)
259 {
260 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
261
262 /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason */
263 /* only check the debug reason if we don't know it already */
264
265 if ((target->debug_reason != DBG_REASON_DBGRQ)
266 && (target->debug_reason != DBG_REASON_SINGLESTEP))
267 {
268 if (cortex_m3->nvic_dfsr & DFSR_BKPT)
269 {
270 target->debug_reason = DBG_REASON_BREAKPOINT;
271 if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
272 target->debug_reason = DBG_REASON_WPTANDBKPT;
273 }
274 else if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
275 target->debug_reason = DBG_REASON_WATCHPOINT;
276 else if (cortex_m3->nvic_dfsr & DFSR_VCATCH)
277 target->debug_reason = DBG_REASON_BREAKPOINT;
278 else /* EXTERNAL, HALTED */
279 target->debug_reason = DBG_REASON_UNDEFINED;
280 }
281
282 return ERROR_OK;
283 }
284
285 static int cortex_m3_examine_exception_reason(struct target *target)
286 {
287 uint32_t shcsr, except_sr, cfsr = -1, except_ar = -1;
288 struct armv7m_common *armv7m = target_to_armv7m(target);
289 struct adiv5_dap *swjdp = &armv7m->dap;
290 int retval;
291
292 mem_ap_read_u32(swjdp, NVIC_SHCSR, &shcsr);
293 switch (armv7m->exception_number)
294 {
295 case 2: /* NMI */
296 break;
297 case 3: /* Hard Fault */
298 mem_ap_read_atomic_u32(swjdp, NVIC_HFSR, &except_sr);
299 if (except_sr & 0x40000000)
300 {
301 mem_ap_read_u32(swjdp, NVIC_CFSR, &cfsr);
302 }
303 break;
304 case 4: /* Memory Management */
305 mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr);
306 mem_ap_read_u32(swjdp, NVIC_MMFAR, &except_ar);
307 break;
308 case 5: /* Bus Fault */
309 mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr);
310 mem_ap_read_u32(swjdp, NVIC_BFAR, &except_ar);
311 break;
312 case 6: /* Usage Fault */
313 mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr);
314 break;
315 case 11: /* SVCall */
316 break;
317 case 12: /* Debug Monitor */
318 mem_ap_read_u32(swjdp, NVIC_DFSR, &except_sr);
319 break;
320 case 14: /* PendSV */
321 break;
322 case 15: /* SysTick */
323 break;
324 default:
325 except_sr = 0;
326 break;
327 }
328 retval = dap_run(swjdp);
329 if (retval == ERROR_OK)
330 LOG_DEBUG("%s SHCSR 0x%" PRIx32 ", SR 0x%" PRIx32
331 ", CFSR 0x%" PRIx32 ", AR 0x%" PRIx32,
332 armv7m_exception_string(armv7m->exception_number),
333 shcsr, except_sr, cfsr, except_ar);
334 return retval;
335 }
336
337 /* PSP is used in some thread modes */
338 static const int armv7m_psp_reg_map[17] = {
339 ARMV7M_R0, ARMV7M_R1, ARMV7M_R2, ARMV7M_R3,
340 ARMV7M_R4, ARMV7M_R5, ARMV7M_R6, ARMV7M_R7,
341 ARMV7M_R8, ARMV7M_R9, ARMV7M_R10, ARMV7M_R11,
342 ARMV7M_R12, ARMV7M_PSP, ARMV7M_R14, ARMV7M_PC,
343 ARMV7M_xPSR,
344 };
345
346 /* MSP is used in handler and some thread modes */
347 static const int armv7m_msp_reg_map[17] = {
348 ARMV7M_R0, ARMV7M_R1, ARMV7M_R2, ARMV7M_R3,
349 ARMV7M_R4, ARMV7M_R5, ARMV7M_R6, ARMV7M_R7,
350 ARMV7M_R8, ARMV7M_R9, ARMV7M_R10, ARMV7M_R11,
351 ARMV7M_R12, ARMV7M_MSP, ARMV7M_R14, ARMV7M_PC,
352 ARMV7M_xPSR,
353 };
354
355 static int cortex_m3_debug_entry(struct target *target)
356 {
357 int i;
358 uint32_t xPSR;
359 int retval;
360 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
361 struct armv7m_common *armv7m = &cortex_m3->armv7m;
362 struct arm *arm = &armv7m->arm;
363 struct adiv5_dap *swjdp = &armv7m->dap;
364 struct reg *r;
365
366 LOG_DEBUG(" ");
367
368 cortex_m3_clear_halt(target);
369 mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
370
371 if ((retval = armv7m->examine_debug_reason(target)) != ERROR_OK)
372 return retval;
373
374 /* Examine target state and mode */
375 /* First load register acessible through core debug port*/
376 int num_regs = armv7m->core_cache->num_regs;
377
378 for (i = 0; i < num_regs; i++)
379 {
380 if (!armv7m->core_cache->reg_list[i].valid)
381 armv7m->read_core_reg(target, i);
382 }
383
384 r = armv7m->core_cache->reg_list + ARMV7M_xPSR;
385 xPSR = buf_get_u32(r->value, 0, 32);
386
387 #ifdef ARMV7_GDB_HACKS
388 /* FIXME this breaks on scan chains with more than one Cortex-M3.
389 * Instead, each CM3 should have its own dummy value...
390 */
391 /* copy real xpsr reg for gdb, setting thumb bit */
392 buf_set_u32(armv7m_gdb_dummy_cpsr_value, 0, 32, xPSR);
393 buf_set_u32(armv7m_gdb_dummy_cpsr_value, 5, 1, 1);
394 armv7m_gdb_dummy_cpsr_reg.valid = r->valid;
395 armv7m_gdb_dummy_cpsr_reg.dirty = r->dirty;
396 #endif
397
398 /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
399 if (xPSR & 0xf00)
400 {
401 r->dirty = r->valid;
402 cortex_m3_store_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 16, xPSR &~ 0xff);
403 }
404
405 /* Are we in an exception handler */
406 if (xPSR & 0x1FF)
407 {
408 armv7m->core_mode = ARMV7M_MODE_HANDLER;
409 armv7m->exception_number = (xPSR & 0x1FF);
410
411 arm->core_mode = ARM_MODE_HANDLER;
412 arm->map = armv7m_msp_reg_map;
413 }
414 else
415 {
416 unsigned control = buf_get_u32(armv7m->core_cache
417 ->reg_list[ARMV7M_CONTROL].value, 0, 2);
418
419 /* is this thread privileged? */
420 armv7m->core_mode = control & 1;
421 arm->core_mode = armv7m->core_mode
422 ? ARM_MODE_USER_THREAD
423 : ARM_MODE_THREAD;
424
425 /* which stack is it using? */
426 if (control & 2)
427 arm->map = armv7m_psp_reg_map;
428 else
429 arm->map = armv7m_msp_reg_map;
430
431 armv7m->exception_number = 0;
432 }
433
434 if (armv7m->exception_number)
435 {
436 cortex_m3_examine_exception_reason(target);
437 }
438
439 LOG_DEBUG("entered debug state in core mode: %s at PC 0x%" PRIx32 ", target->state: %s",
440 armv7m_mode_strings[armv7m->core_mode],
441 *(uint32_t*)(arm->pc->value),
442 target_state_name(target));
443
444 if (armv7m->post_debug_entry)
445 armv7m->post_debug_entry(target);
446
447 return ERROR_OK;
448 }
449
450 static int cortex_m3_poll(struct target *target)
451 {
452 int retval;
453 enum target_state prev_target_state = target->state;
454 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
455 struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
456
457 /* Read from Debug Halting Control and Status Register */
458 retval = mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
459 if (retval != ERROR_OK)
460 {
461 target->state = TARGET_UNKNOWN;
462 return retval;
463 }
464
465 /* Recover from lockup. See ARMv7-M architecture spec,
466 * section B1.5.15 "Unrecoverable exception cases".
467 *
468 * REVISIT Is there a better way to report and handle this?
469 */
470 if (cortex_m3->dcb_dhcsr & S_LOCKUP) {
471 LOG_WARNING("%s -- clearing lockup after double fault",
472 target_name(target));
473 cortex_m3_write_debug_halt_mask(target, C_HALT, 0);
474 target->debug_reason = DBG_REASON_DBGRQ;
475
476 /* refresh status bits */
477 mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
478 }
479
480 if (cortex_m3->dcb_dhcsr & S_RESET_ST)
481 {
482 /* check if still in reset */
483 mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
484
485 if (cortex_m3->dcb_dhcsr & S_RESET_ST)
486 {
487 target->state = TARGET_RESET;
488 return ERROR_OK;
489 }
490 }
491
492 if (target->state == TARGET_RESET)
493 {
494 /* Cannot switch context while running so endreset is
495 * called with target->state == TARGET_RESET
496 */
497 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%" PRIx32,
498 cortex_m3->dcb_dhcsr);
499 cortex_m3_endreset_event(target);
500 target->state = TARGET_RUNNING;
501 prev_target_state = TARGET_RUNNING;
502 }
503
504 if (cortex_m3->dcb_dhcsr & S_HALT)
505 {
506 target->state = TARGET_HALTED;
507
508 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET))
509 {
510 if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
511 return retval;
512
513 if (arm_semihosting(target, &retval) != 0)
514 return retval;
515
516 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
517 }
518 if (prev_target_state == TARGET_DEBUG_RUNNING)
519 {
520 LOG_DEBUG(" ");
521 if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
522 return retval;
523
524 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
525 }
526 }
527
528 /* REVISIT when S_SLEEP is set, it's in a Sleep or DeepSleep state.
529 * How best to model low power modes?
530 */
531
532 if (target->state == TARGET_UNKNOWN)
533 {
534 /* check if processor is retiring instructions */
535 if (cortex_m3->dcb_dhcsr & S_RETIRE_ST)
536 {
537 target->state = TARGET_RUNNING;
538 return ERROR_OK;
539 }
540 }
541
542 return ERROR_OK;
543 }
544
545 static int cortex_m3_halt(struct target *target)
546 {
547 LOG_DEBUG("target->state: %s",
548 target_state_name(target));
549
550 if (target->state == TARGET_HALTED)
551 {
552 LOG_DEBUG("target was already halted");
553 return ERROR_OK;
554 }
555
556 if (target->state == TARGET_UNKNOWN)
557 {
558 LOG_WARNING("target was in unknown state when halt was requested");
559 }
560
561 if (target->state == TARGET_RESET)
562 {
563 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst())
564 {
565 LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
566 return ERROR_TARGET_FAILURE;
567 }
568 else
569 {
570 /* we came here in a reset_halt or reset_init sequence
571 * debug entry was already prepared in cortex_m3_prepare_reset_halt()
572 */
573 target->debug_reason = DBG_REASON_DBGRQ;
574
575 return ERROR_OK;
576 }
577 }
578
579 /* Write to Debug Halting Control and Status Register */
580 cortex_m3_write_debug_halt_mask(target, C_HALT, 0);
581
582 target->debug_reason = DBG_REASON_DBGRQ;
583
584 return ERROR_OK;
585 }
586
587 static int cortex_m3_soft_reset_halt(struct target *target)
588 {
589 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
590 struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
591 uint32_t dcb_dhcsr = 0;
592 int retval, timeout = 0;
593
594 /* Enter debug state on reset; restore DEMCR in endreset_event() */
595 mem_ap_write_u32(swjdp, DCB_DEMCR,
596 TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
597
598 /* Request a core-only reset */
599 mem_ap_write_atomic_u32(swjdp, NVIC_AIRCR,
600 AIRCR_VECTKEY | AIRCR_VECTRESET);
601 target->state = TARGET_RESET;
602
603 /* registers are now invalid */
604 register_cache_invalidate(cortex_m3->armv7m.core_cache);
605
606 while (timeout < 100)
607 {
608 retval = mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &dcb_dhcsr);
609 if (retval == ERROR_OK)
610 {
611 mem_ap_read_atomic_u32(swjdp, NVIC_DFSR,
612 &cortex_m3->nvic_dfsr);
613 if ((dcb_dhcsr & S_HALT)
614 && (cortex_m3->nvic_dfsr & DFSR_VCATCH))
615 {
616 LOG_DEBUG("system reset-halted, DHCSR 0x%08x, "
617 "DFSR 0x%08x",
618 (unsigned) dcb_dhcsr,
619 (unsigned) cortex_m3->nvic_dfsr);
620 cortex_m3_poll(target);
621 /* FIXME restore user's vector catch config */
622 return ERROR_OK;
623 }
624 else
625 LOG_DEBUG("waiting for system reset-halt, "
626 "DHCSR 0x%08x, %d ms",
627 (unsigned) dcb_dhcsr, timeout);
628 }
629 timeout++;
630 alive_sleep(1);
631 }
632
633 return ERROR_OK;
634 }
635
636 static void cortex_m3_enable_breakpoints(struct target *target)
637 {
638 struct breakpoint *breakpoint = target->breakpoints;
639
640 /* set any pending breakpoints */
641 while (breakpoint)
642 {
643 if (!breakpoint->set)
644 cortex_m3_set_breakpoint(target, breakpoint);
645 breakpoint = breakpoint->next;
646 }
647 }
648
649 static int cortex_m3_resume(struct target *target, int current,
650 uint32_t address, int handle_breakpoints, int debug_execution)
651 {
652 struct armv7m_common *armv7m = target_to_armv7m(target);
653 struct breakpoint *breakpoint = NULL;
654 uint32_t resume_pc;
655 struct reg *r;
656
657 if (target->state != TARGET_HALTED)
658 {
659 LOG_WARNING("target not halted");
660 return ERROR_TARGET_NOT_HALTED;
661 }
662
663 if (!debug_execution)
664 {
665 target_free_all_working_areas(target);
666 cortex_m3_enable_breakpoints(target);
667 cortex_m3_enable_watchpoints(target);
668 }
669
670 if (debug_execution)
671 {
672 r = armv7m->core_cache->reg_list + ARMV7M_PRIMASK;
673
674 /* Disable interrupts */
675 /* We disable interrupts in the PRIMASK register instead of
676 * masking with C_MASKINTS. This is probably the same issue
677 * as Cortex-M3 Erratum 377493 (fixed in r1p0): C_MASKINTS
678 * in parallel with disabled interrupts can cause local faults
679 * to not be taken.
680 *
681 * REVISIT this clearly breaks non-debug execution, since the
682 * PRIMASK register state isn't saved/restored... workaround
683 * by never resuming app code after debug execution.
684 */
685 buf_set_u32(r->value, 0, 1, 1);
686 r->dirty = true;
687 r->valid = true;
688
689 /* Make sure we are in Thumb mode */
690 r = armv7m->core_cache->reg_list + ARMV7M_xPSR;
691 buf_set_u32(r->value, 24, 1, 1);
692 r->dirty = true;
693 r->valid = true;
694 }
695
696 /* current = 1: continue on current pc, otherwise continue at <address> */
697 r = armv7m->arm.pc;
698 if (!current)
699 {
700 buf_set_u32(r->value, 0, 32, address);
701 r->dirty = true;
702 r->valid = true;
703 }
704
705 /* if we halted last time due to a bkpt instruction
706 * then we have to manually step over it, otherwise
707 * the core will break again */
708
709 if (!breakpoint_find(target, buf_get_u32(r->value, 0, 32))
710 && !debug_execution)
711 {
712 armv7m_maybe_skip_bkpt_inst(target, NULL);
713 }
714
715 resume_pc = buf_get_u32(r->value, 0, 32);
716
717 armv7m_restore_context(target);
718
719 /* the front-end may request us not to handle breakpoints */
720 if (handle_breakpoints)
721 {
722 /* Single step past breakpoint at current address */
723 if ((breakpoint = breakpoint_find(target, resume_pc)))
724 {
725 LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 " (ID: %d)",
726 breakpoint->address,
727 breakpoint->unique_id);
728 cortex_m3_unset_breakpoint(target, breakpoint);
729 cortex_m3_single_step_core(target);
730 cortex_m3_set_breakpoint(target, breakpoint);
731 }
732 }
733
734 /* Restart core */
735 cortex_m3_write_debug_halt_mask(target, 0, C_HALT);
736
737 target->debug_reason = DBG_REASON_NOTHALTED;
738
739 /* registers are now invalid */
740 register_cache_invalidate(armv7m->core_cache);
741
742 if (!debug_execution)
743 {
744 target->state = TARGET_RUNNING;
745 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
746 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
747 }
748 else
749 {
750 target->state = TARGET_DEBUG_RUNNING;
751 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
752 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
753 }
754
755 return ERROR_OK;
756 }
757
758 /* int irqstepcount = 0; */
759 static int cortex_m3_step(struct target *target, int current,
760 uint32_t address, int handle_breakpoints)
761 {
762 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
763 struct armv7m_common *armv7m = &cortex_m3->armv7m;
764 struct adiv5_dap *swjdp = &armv7m->dap;
765 struct breakpoint *breakpoint = NULL;
766 struct reg *pc = armv7m->arm.pc;
767 bool bkpt_inst_found = false;
768
769 if (target->state != TARGET_HALTED)
770 {
771 LOG_WARNING("target not halted");
772 return ERROR_TARGET_NOT_HALTED;
773 }
774
775 /* current = 1: continue on current pc, otherwise continue at <address> */
776 if (!current)
777 buf_set_u32(pc->value, 0, 32, address);
778
779 /* the front-end may request us not to handle breakpoints */
780 if (handle_breakpoints) {
781 breakpoint = breakpoint_find(target,
782 buf_get_u32(pc->value, 0, 32));
783 if (breakpoint)
784 cortex_m3_unset_breakpoint(target, breakpoint);
785 }
786
787 armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found);
788
789 target->debug_reason = DBG_REASON_SINGLESTEP;
790
791 armv7m_restore_context(target);
792
793 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
794
795 /* if no bkpt instruction is found at pc then we can perform
796 * a normal step, otherwise we have to manually step over the bkpt
797 * instruction - as such simulate a step */
798 if (bkpt_inst_found == false)
799 {
800 /* set step and clear halt */
801 cortex_m3_write_debug_halt_mask(target, C_STEP, C_HALT);
802 }
803
804 mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
805
806 /* registers are now invalid */
807 register_cache_invalidate(cortex_m3->armv7m.core_cache);
808
809 if (breakpoint)
810 cortex_m3_set_breakpoint(target, breakpoint);
811
812 LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
813 " nvic_icsr = 0x%" PRIx32,
814 cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
815
816 cortex_m3_debug_entry(target);
817 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
818
819 LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
820 " nvic_icsr = 0x%" PRIx32,
821 cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
822
823 return ERROR_OK;
824 }
825
826 static int cortex_m3_assert_reset(struct target *target)
827 {
828 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
829 struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
830 int assert_srst = 1;
831
832 LOG_DEBUG("target->state: %s",
833 target_state_name(target));
834
835 enum reset_types jtag_reset_config = jtag_get_reset_config();
836
837 /*
838 * We can reset Cortex-M3 targets using just the NVIC without
839 * requiring SRST, getting a SoC reset (or a core-only reset)
840 * instead of a system reset.
841 */
842 if (!(jtag_reset_config & RESET_HAS_SRST))
843 assert_srst = 0;
844
845 /* Enable debug requests */
846 mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
847 if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
848 mem_ap_write_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN);
849
850 mem_ap_write_u32(swjdp, DCB_DCRDR, 0);
851
852 if (!target->reset_halt)
853 {
854 /* Set/Clear C_MASKINTS in a separate operation */
855 if (cortex_m3->dcb_dhcsr & C_MASKINTS)
856 mem_ap_write_atomic_u32(swjdp, DCB_DHCSR,
857 DBGKEY | C_DEBUGEN | C_HALT);
858
859 /* clear any debug flags before resuming */
860 cortex_m3_clear_halt(target);
861
862 /* clear C_HALT in dhcsr reg */
863 cortex_m3_write_debug_halt_mask(target, 0, C_HALT);
864 }
865 else
866 {
867 /* Halt in debug on reset; endreset_event() restores DEMCR.
868 *
869 * REVISIT catching BUSERR presumably helps to defend against
870 * bad vector table entries. Should this include MMERR or
871 * other flags too?
872 */
873 mem_ap_write_atomic_u32(swjdp, DCB_DEMCR,
874 TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
875 }
876
877 /*
878 * When nRST is asserted on most Stellaris devices, it clears some of
879 * the debug state. The ARMv7M and Cortex-M3 TRMs say that's wrong;
880 * and OpenOCD depends on those TRMs. So we won't use SRST on those
881 * chips. (Only power-on reset should affect debug state, beyond a
882 * few specified bits; not the chip's nRST input, wired to SRST.)
883 *
884 * REVISIT current errata specs don't seem to cover this issue.
885 * Do we have more details than this email?
886 * https://lists.berlios.de/pipermail
887 * /openocd-development/2008-August/003065.html
888 */
889 if (strcmp(target->variant, "lm3s") == 0)
890 {
891 /* Check for silicon revisions with the issue. */
892 uint32_t did0;
893
894 if (target_read_u32(target, 0x400fe000, &did0) == ERROR_OK)
895 {
896 switch ((did0 >> 16) & 0xff)
897 {
898 case 0:
899 /* all Sandstorm suffer issue */
900 assert_srst = 0;
901 break;
902
903 case 1:
904 case 3:
905 /* Fury and DustDevil rev A have
906 * this nRST problem. It should
907 * be fixed in rev B silicon.
908 */
909 if (((did0 >> 8) & 0xff) == 0)
910 assert_srst = 0;
911 break;
912 case 4:
913 /* Tempest should be fine. */
914 break;
915 }
916 }
917 }
918
919 if (assert_srst)
920 {
921 /* default to asserting srst */
922 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
923 {
924 jtag_add_reset(1, 1);
925 }
926 else
927 {
928 jtag_add_reset(0, 1);
929 }
930 }
931 else
932 {
933 /* Use a standard Cortex-M3 software reset mechanism.
934 * SYSRESETREQ will reset SoC peripherals outside the
935 * core, like watchdog timers, if the SoC wires it up
936 * correctly. Else VECRESET can reset just the core.
937 */
938 mem_ap_write_atomic_u32(swjdp, NVIC_AIRCR,
939 AIRCR_VECTKEY | AIRCR_SYSRESETREQ);
940 LOG_DEBUG("Using Cortex-M3 SYSRESETREQ");
941
942 {
943 /* I do not know why this is necessary, but it
944 * fixes strange effects (step/resume cause NMI
945 * after reset) on LM3S6918 -- Michael Schwingen
946 */
947 uint32_t tmp;
948 mem_ap_read_atomic_u32(swjdp, NVIC_AIRCR, &tmp);
949 }
950 }
951
952 target->state = TARGET_RESET;
953 jtag_add_sleep(50000);
954
955 register_cache_invalidate(cortex_m3->armv7m.core_cache);
956
957 if (target->reset_halt)
958 {
959 int retval;
960 if ((retval = target_halt(target)) != ERROR_OK)
961 return retval;
962 }
963
964 return ERROR_OK;
965 }
966
967 static int cortex_m3_deassert_reset(struct target *target)
968 {
969 LOG_DEBUG("target->state: %s",
970 target_state_name(target));
971
972 /* deassert reset lines */
973 jtag_add_reset(0, 0);
974
975 return ERROR_OK;
976 }
977
978 static int
979 cortex_m3_set_breakpoint(struct target *target, struct breakpoint *breakpoint)
980 {
981 int retval;
982 int fp_num = 0;
983 uint32_t hilo;
984 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
985 struct cortex_m3_fp_comparator *comparator_list = cortex_m3->fp_comparator_list;
986
987 if (breakpoint->set)
988 {
989 LOG_WARNING("breakpoint (BPID: %d) already set", breakpoint->unique_id);
990 return ERROR_OK;
991 }
992
993 if (cortex_m3->auto_bp_type)
994 {
995 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
996 }
997
998 if (breakpoint->type == BKPT_HARD)
999 {
1000 while (comparator_list[fp_num].used && (fp_num < cortex_m3->fp_num_code))
1001 fp_num++;
1002 if (fp_num >= cortex_m3->fp_num_code)
1003 {
1004 LOG_ERROR("Can not find free FPB Comparator!");
1005 return ERROR_FAIL;
1006 }
1007 breakpoint->set = fp_num + 1;
1008 hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
1009 comparator_list[fp_num].used = 1;
1010 comparator_list[fp_num].fpcr_value = (breakpoint->address & 0x1FFFFFFC) | hilo | 1;
1011 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
1012 LOG_DEBUG("fpc_num %i fpcr_value 0x%" PRIx32 "", fp_num, comparator_list[fp_num].fpcr_value);
1013 if (!cortex_m3->fpb_enabled)
1014 {
1015 LOG_DEBUG("FPB wasn't enabled, do it now");
1016 target_write_u32(target, FP_CTRL, 3);
1017 }
1018 }
1019 else if (breakpoint->type == BKPT_SOFT)
1020 {
1021 uint8_t code[4];
1022
1023 /* NOTE: on ARMv6-M and ARMv7-M, BKPT(0xab) is used for
1024 * semihosting; don't use that. Otherwise the BKPT
1025 * parameter is arbitrary.
1026 */
1027 buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1028 retval = target_read_memory(target,
1029 breakpoint->address & 0xFFFFFFFE,
1030 breakpoint->length, 1,
1031 breakpoint->orig_instr);
1032 if (retval != ERROR_OK)
1033 return retval;
1034 retval = target_write_memory(target,
1035 breakpoint->address & 0xFFFFFFFE,
1036 breakpoint->length, 1,
1037 code);
1038 if (retval != ERROR_OK)
1039 return retval;
1040 breakpoint->set = true;
1041 }
1042
1043 LOG_DEBUG("BPID: %d, Type: %d, Address: 0x%08" PRIx32 " Length: %d (set=%d)",
1044 breakpoint->unique_id,
1045 (int)(breakpoint->type),
1046 breakpoint->address,
1047 breakpoint->length,
1048 breakpoint->set);
1049
1050 return ERROR_OK;
1051 }
1052
1053 static int
1054 cortex_m3_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
1055 {
1056 int retval;
1057 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1058 struct cortex_m3_fp_comparator * comparator_list = cortex_m3->fp_comparator_list;
1059
1060 if (!breakpoint->set)
1061 {
1062 LOG_WARNING("breakpoint not set");
1063 return ERROR_OK;
1064 }
1065
1066 LOG_DEBUG("BPID: %d, Type: %d, Address: 0x%08" PRIx32 " Length: %d (set=%d)",
1067 breakpoint->unique_id,
1068 (int)(breakpoint->type),
1069 breakpoint->address,
1070 breakpoint->length,
1071 breakpoint->set);
1072
1073 if (breakpoint->type == BKPT_HARD)
1074 {
1075 int fp_num = breakpoint->set - 1;
1076 if ((fp_num < 0) || (fp_num >= cortex_m3->fp_num_code))
1077 {
1078 LOG_DEBUG("Invalid FP Comparator number in breakpoint");
1079 return ERROR_OK;
1080 }
1081 comparator_list[fp_num].used = 0;
1082 comparator_list[fp_num].fpcr_value = 0;
1083 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
1084 }
1085 else
1086 {
1087 /* restore original instruction (kept in target endianness) */
1088 if (breakpoint->length == 4)
1089 {
1090 if ((retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1, breakpoint->orig_instr)) != ERROR_OK)
1091 {
1092 return retval;
1093 }
1094 }
1095 else
1096 {
1097 if ((retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1, breakpoint->orig_instr)) != ERROR_OK)
1098 {
1099 return retval;
1100 }
1101 }
1102 }
1103 breakpoint->set = false;
1104
1105 return ERROR_OK;
1106 }
1107
1108 static int
1109 cortex_m3_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
1110 {
1111 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1112
1113 if (cortex_m3->auto_bp_type)
1114 {
1115 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
1116 #ifdef ARMV7_GDB_HACKS
1117 if (breakpoint->length != 2) {
1118 /* XXX Hack: Replace all breakpoints with length != 2 with
1119 * a hardware breakpoint. */
1120 breakpoint->type = BKPT_HARD;
1121 breakpoint->length = 2;
1122 }
1123 #endif
1124 }
1125
1126 if ((breakpoint->type == BKPT_HARD) && (breakpoint->address >= 0x20000000))
1127 {
1128 LOG_INFO("flash patch comparator requested outside code memory region");
1129 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1130 }
1131
1132 if ((breakpoint->type == BKPT_SOFT) && (breakpoint->address < 0x20000000))
1133 {
1134 LOG_INFO("soft breakpoint requested in code (flash) memory region");
1135 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1136 }
1137
1138 if ((breakpoint->type == BKPT_HARD) && (cortex_m3->fp_code_available < 1))
1139 {
1140 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
1141 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1142 }
1143
1144 if ((breakpoint->length != 2))
1145 {
1146 LOG_INFO("only breakpoints of two bytes length supported");
1147 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1148 }
1149
1150 if (breakpoint->type == BKPT_HARD)
1151 cortex_m3->fp_code_available--;
1152 cortex_m3_set_breakpoint(target, breakpoint);
1153
1154 return ERROR_OK;
1155 }
1156
1157 static int
1158 cortex_m3_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
1159 {
1160 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1161
1162 /* REVISIT why check? FBP can be updated with core running ... */
1163 if (target->state != TARGET_HALTED)
1164 {
1165 LOG_WARNING("target not halted");
1166 return ERROR_TARGET_NOT_HALTED;
1167 }
1168
1169 if (cortex_m3->auto_bp_type)
1170 {
1171 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
1172 }
1173
1174 if (breakpoint->set)
1175 {
1176 cortex_m3_unset_breakpoint(target, breakpoint);
1177 }
1178
1179 if (breakpoint->type == BKPT_HARD)
1180 cortex_m3->fp_code_available++;
1181
1182 return ERROR_OK;
1183 }
1184
1185 static int
1186 cortex_m3_set_watchpoint(struct target *target, struct watchpoint *watchpoint)
1187 {
1188 int dwt_num = 0;
1189 uint32_t mask, temp;
1190 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1191
1192 /* watchpoint params were validated earlier */
1193 mask = 0;
1194 temp = watchpoint->length;
1195 while (temp) {
1196 temp >>= 1;
1197 mask++;
1198 }
1199 mask--;
1200
1201 /* REVISIT Don't fully trust these "not used" records ... users
1202 * may set up breakpoints by hand, e.g. dual-address data value
1203 * watchpoint using comparator #1; comparator #0 matching cycle
1204 * count; send data trace info through ITM and TPIU; etc
1205 */
1206 struct cortex_m3_dwt_comparator *comparator;
1207
1208 for (comparator = cortex_m3->dwt_comparator_list;
1209 comparator->used && dwt_num < cortex_m3->dwt_num_comp;
1210 comparator++, dwt_num++)
1211 continue;
1212 if (dwt_num >= cortex_m3->dwt_num_comp)
1213 {
1214 LOG_ERROR("Can not find free DWT Comparator");
1215 return ERROR_FAIL;
1216 }
1217 comparator->used = 1;
1218 watchpoint->set = dwt_num + 1;
1219
1220 comparator->comp = watchpoint->address;
1221 target_write_u32(target, comparator->dwt_comparator_address + 0,
1222 comparator->comp);
1223
1224 comparator->mask = mask;
1225 target_write_u32(target, comparator->dwt_comparator_address + 4,
1226 comparator->mask);
1227
1228 switch (watchpoint->rw) {
1229 case WPT_READ:
1230 comparator->function = 5;
1231 break;
1232 case WPT_WRITE:
1233 comparator->function = 6;
1234 break;
1235 case WPT_ACCESS:
1236 comparator->function = 7;
1237 break;
1238 }
1239 target_write_u32(target, comparator->dwt_comparator_address + 8,
1240 comparator->function);
1241
1242 LOG_DEBUG("Watchpoint (ID %d) DWT%d 0x%08x 0x%x 0x%05x",
1243 watchpoint->unique_id, dwt_num,
1244 (unsigned) comparator->comp,
1245 (unsigned) comparator->mask,
1246 (unsigned) comparator->function);
1247 return ERROR_OK;
1248 }
1249
1250 static int
1251 cortex_m3_unset_watchpoint(struct target *target, struct watchpoint *watchpoint)
1252 {
1253 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1254 struct cortex_m3_dwt_comparator *comparator;
1255 int dwt_num;
1256
1257 if (!watchpoint->set)
1258 {
1259 LOG_WARNING("watchpoint (wpid: %d) not set",
1260 watchpoint->unique_id);
1261 return ERROR_OK;
1262 }
1263
1264 dwt_num = watchpoint->set - 1;
1265
1266 LOG_DEBUG("Watchpoint (ID %d) DWT%d address: 0x%08x clear",
1267 watchpoint->unique_id, dwt_num,
1268 (unsigned) watchpoint->address);
1269
1270 if ((dwt_num < 0) || (dwt_num >= cortex_m3->dwt_num_comp))
1271 {
1272 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1273 return ERROR_OK;
1274 }
1275
1276 comparator = cortex_m3->dwt_comparator_list + dwt_num;
1277 comparator->used = 0;
1278 comparator->function = 0;
1279 target_write_u32(target, comparator->dwt_comparator_address + 8,
1280 comparator->function);
1281
1282 watchpoint->set = false;
1283
1284 return ERROR_OK;
1285 }
1286
1287 static int
1288 cortex_m3_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
1289 {
1290 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1291
1292 if (cortex_m3->dwt_comp_available < 1)
1293 {
1294 LOG_DEBUG("no comparators?");
1295 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1296 }
1297
1298 /* hardware doesn't support data value masking */
1299 if (watchpoint->mask != ~(uint32_t)0) {
1300 LOG_DEBUG("watchpoint value masks not supported");
1301 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1302 }
1303
1304 /* hardware allows address masks of up to 32K */
1305 unsigned mask;
1306
1307 for (mask = 0; mask < 16; mask++) {
1308 if ((1u << mask) == watchpoint->length)
1309 break;
1310 }
1311 if (mask == 16) {
1312 LOG_DEBUG("unsupported watchpoint length");
1313 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1314 }
1315 if (watchpoint->address & ((1 << mask) - 1)) {
1316 LOG_DEBUG("watchpoint address is unaligned");
1317 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1318 }
1319
1320 /* Caller doesn't seem to be able to describe watching for data
1321 * values of zero; that flags "no value".
1322 *
1323 * REVISIT This DWT may well be able to watch for specific data
1324 * values. Requires comparator #1 to set DATAVMATCH and match
1325 * the data, and another comparator (DATAVADDR0) matching addr.
1326 */
1327 if (watchpoint->value) {
1328 LOG_DEBUG("data value watchpoint not YET supported");
1329 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1330 }
1331
1332 cortex_m3->dwt_comp_available--;
1333 LOG_DEBUG("dwt_comp_available: %d", cortex_m3->dwt_comp_available);
1334
1335 return ERROR_OK;
1336 }
1337
1338 static int
1339 cortex_m3_remove_watchpoint(struct target *target, struct watchpoint *watchpoint)
1340 {
1341 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1342
1343 /* REVISIT why check? DWT can be updated with core running ... */
1344 if (target->state != TARGET_HALTED)
1345 {
1346 LOG_WARNING("target not halted");
1347 return ERROR_TARGET_NOT_HALTED;
1348 }
1349
1350 if (watchpoint->set)
1351 {
1352 cortex_m3_unset_watchpoint(target, watchpoint);
1353 }
1354
1355 cortex_m3->dwt_comp_available++;
1356 LOG_DEBUG("dwt_comp_available: %d", cortex_m3->dwt_comp_available);
1357
1358 return ERROR_OK;
1359 }
1360
1361 static void cortex_m3_enable_watchpoints(struct target *target)
1362 {
1363 struct watchpoint *watchpoint = target->watchpoints;
1364
1365 /* set any pending watchpoints */
1366 while (watchpoint)
1367 {
1368 if (!watchpoint->set)
1369 cortex_m3_set_watchpoint(target, watchpoint);
1370 watchpoint = watchpoint->next;
1371 }
1372 }
1373
1374 static int cortex_m3_load_core_reg_u32(struct target *target,
1375 enum armv7m_regtype type, uint32_t num, uint32_t * value)
1376 {
1377 int retval;
1378 struct armv7m_common *armv7m = target_to_armv7m(target);
1379 struct adiv5_dap *swjdp = &armv7m->dap;
1380
1381 /* NOTE: we "know" here that the register identifiers used
1382 * in the v7m header match the Cortex-M3 Debug Core Register
1383 * Selector values for R0..R15, xPSR, MSP, and PSP.
1384 */
1385 switch (num) {
1386 case 0 ... 18:
1387 /* read a normal core register */
1388 retval = cortexm3_dap_read_coreregister_u32(swjdp, value, num);
1389
1390 if (retval != ERROR_OK)
1391 {
1392 LOG_ERROR("JTAG failure %i",retval);
1393 return ERROR_JTAG_DEVICE_ERROR;
1394 }
1395 LOG_DEBUG("load from core reg %i value 0x%" PRIx32 "",(int)num,*value);
1396 break;
1397
1398 case ARMV7M_PRIMASK:
1399 case ARMV7M_BASEPRI:
1400 case ARMV7M_FAULTMASK:
1401 case ARMV7M_CONTROL:
1402 /* Cortex-M3 packages these four registers as bitfields
1403 * in one Debug Core register. So say r0 and r2 docs;
1404 * it was removed from r1 docs, but still works.
1405 */
1406 cortexm3_dap_read_coreregister_u32(swjdp, value, 20);
1407
1408 switch (num)
1409 {
1410 case ARMV7M_PRIMASK:
1411 *value = buf_get_u32((uint8_t*)value, 0, 1);
1412 break;
1413
1414 case ARMV7M_BASEPRI:
1415 *value = buf_get_u32((uint8_t*)value, 8, 8);
1416 break;
1417
1418 case ARMV7M_FAULTMASK:
1419 *value = buf_get_u32((uint8_t*)value, 16, 1);
1420 break;
1421
1422 case ARMV7M_CONTROL:
1423 *value = buf_get_u32((uint8_t*)value, 24, 2);
1424 break;
1425 }
1426
1427 LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "", (int)num, *value);
1428 break;
1429
1430 default:
1431 return ERROR_INVALID_ARGUMENTS;
1432 }
1433
1434 return ERROR_OK;
1435 }
1436
1437 static int cortex_m3_store_core_reg_u32(struct target *target,
1438 enum armv7m_regtype type, uint32_t num, uint32_t value)
1439 {
1440 int retval;
1441 uint32_t reg;
1442 struct armv7m_common *armv7m = target_to_armv7m(target);
1443 struct adiv5_dap *swjdp = &armv7m->dap;
1444
1445 #ifdef ARMV7_GDB_HACKS
1446 /* If the LR register is being modified, make sure it will put us
1447 * in "thumb" mode, or an INVSTATE exception will occur. This is a
1448 * hack to deal with the fact that gdb will sometimes "forge"
1449 * return addresses, and doesn't set the LSB correctly (i.e., when
1450 * printing expressions containing function calls, it sets LR = 0.)
1451 * Valid exception return codes have bit 0 set too.
1452 */
1453 if (num == ARMV7M_R14)
1454 value |= 0x01;
1455 #endif
1456
1457 /* NOTE: we "know" here that the register identifiers used
1458 * in the v7m header match the Cortex-M3 Debug Core Register
1459 * Selector values for R0..R15, xPSR, MSP, and PSP.
1460 */
1461 switch (num) {
1462 case 0 ... 18:
1463 retval = cortexm3_dap_write_coreregister_u32(swjdp, value, num);
1464 if (retval != ERROR_OK)
1465 {
1466 struct reg *r;
1467
1468 LOG_ERROR("JTAG failure %i", retval);
1469 r = armv7m->core_cache->reg_list + num;
1470 r->dirty = r->valid;
1471 return ERROR_JTAG_DEVICE_ERROR;
1472 }
1473 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
1474 break;
1475
1476 case ARMV7M_PRIMASK:
1477 case ARMV7M_BASEPRI:
1478 case ARMV7M_FAULTMASK:
1479 case ARMV7M_CONTROL:
1480 /* Cortex-M3 packages these four registers as bitfields
1481 * in one Debug Core register. So say r0 and r2 docs;
1482 * it was removed from r1 docs, but still works.
1483 */
1484 cortexm3_dap_read_coreregister_u32(swjdp, &reg, 20);
1485
1486 switch (num)
1487 {
1488 case ARMV7M_PRIMASK:
1489 buf_set_u32((uint8_t*)&reg, 0, 1, value);
1490 break;
1491
1492 case ARMV7M_BASEPRI:
1493 buf_set_u32((uint8_t*)&reg, 8, 8, value);
1494 break;
1495
1496 case ARMV7M_FAULTMASK:
1497 buf_set_u32((uint8_t*)&reg, 16, 1, value);
1498 break;
1499
1500 case ARMV7M_CONTROL:
1501 buf_set_u32((uint8_t*)&reg, 24, 2, value);
1502 break;
1503 }
1504
1505 cortexm3_dap_write_coreregister_u32(swjdp, reg, 20);
1506
1507 LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value);
1508 break;
1509
1510 default:
1511 return ERROR_INVALID_ARGUMENTS;
1512 }
1513
1514 return ERROR_OK;
1515 }
1516
1517 static int cortex_m3_read_memory(struct target *target, uint32_t address,
1518 uint32_t size, uint32_t count, uint8_t *buffer)
1519 {
1520 struct armv7m_common *armv7m = target_to_armv7m(target);
1521 struct adiv5_dap *swjdp = &armv7m->dap;
1522 int retval = ERROR_INVALID_ARGUMENTS;
1523
1524 /* cortex_m3 handles unaligned memory access */
1525 if (count && buffer) {
1526 switch (size) {
1527 case 4:
1528 retval = mem_ap_read_buf_u32(swjdp, buffer, 4 * count, address);
1529 break;
1530 case 2:
1531 retval = mem_ap_read_buf_u16(swjdp, buffer, 2 * count, address);
1532 break;
1533 case 1:
1534 retval = mem_ap_read_buf_u8(swjdp, buffer, count, address);
1535 break;
1536 }
1537 }
1538
1539 return retval;
1540 }
1541
1542 static int cortex_m3_write_memory(struct target *target, uint32_t address,
1543 uint32_t size, uint32_t count, uint8_t *buffer)
1544 {
1545 struct armv7m_common *armv7m = target_to_armv7m(target);
1546 struct adiv5_dap *swjdp = &armv7m->dap;
1547 int retval = ERROR_INVALID_ARGUMENTS;
1548
1549 if (count && buffer) {
1550 switch (size) {
1551 case 4:
1552 retval = mem_ap_write_buf_u32(swjdp, buffer, 4 * count, address);
1553 break;
1554 case 2:
1555 retval = mem_ap_write_buf_u16(swjdp, buffer, 2 * count, address);
1556 break;
1557 case 1:
1558 retval = mem_ap_write_buf_u8(swjdp, buffer, count, address);
1559 break;
1560 }
1561 }
1562
1563 return retval;
1564 }
1565
1566 static int cortex_m3_bulk_write_memory(struct target *target, uint32_t address,
1567 uint32_t count, uint8_t *buffer)
1568 {
1569 return cortex_m3_write_memory(target, address, 4, count, buffer);
1570 }
1571
1572 static int cortex_m3_init_target(struct command_context *cmd_ctx,
1573 struct target *target)
1574 {
1575 armv7m_build_reg_cache(target);
1576 return ERROR_OK;
1577 }
1578
1579 /* REVISIT cache valid/dirty bits are unmaintained. We could set "valid"
1580 * on r/w if the core is not running, and clear on resume or reset ... or
1581 * at least, in a post_restore_context() method.
1582 */
1583
1584 struct dwt_reg_state {
1585 struct target *target;
1586 uint32_t addr;
1587 uint32_t value; /* scratch/cache */
1588 };
1589
1590 static int cortex_m3_dwt_get_reg(struct reg *reg)
1591 {
1592 struct dwt_reg_state *state = reg->arch_info;
1593
1594 return target_read_u32(state->target, state->addr, &state->value);
1595 }
1596
1597 static int cortex_m3_dwt_set_reg(struct reg *reg, uint8_t *buf)
1598 {
1599 struct dwt_reg_state *state = reg->arch_info;
1600
1601 return target_write_u32(state->target, state->addr,
1602 buf_get_u32(buf, 0, reg->size));
1603 }
1604
1605 struct dwt_reg {
1606 uint32_t addr;
1607 char *name;
1608 unsigned size;
1609 };
1610
1611 static struct dwt_reg dwt_base_regs[] = {
1612 { DWT_CTRL, "dwt_ctrl", 32, },
1613 /* NOTE that Erratum 532314 (fixed r2p0) affects CYCCNT: it wrongly
1614 * increments while the core is asleep.
1615 */
1616 { DWT_CYCCNT, "dwt_cyccnt", 32, },
1617 /* plus some 8 bit counters, useful for profiling with TPIU */
1618 };
1619
1620 static struct dwt_reg dwt_comp[] = {
1621 #define DWT_COMPARATOR(i) \
1622 { DWT_COMP0 + 0x10 * (i), "dwt_" #i "_comp", 32, }, \
1623 { DWT_MASK0 + 0x10 * (i), "dwt_" #i "_mask", 4, }, \
1624 { DWT_FUNCTION0 + 0x10 * (i), "dwt_" #i "_function", 32, }
1625 DWT_COMPARATOR(0),
1626 DWT_COMPARATOR(1),
1627 DWT_COMPARATOR(2),
1628 DWT_COMPARATOR(3),
1629 #undef DWT_COMPARATOR
1630 };
1631
1632 static const struct reg_arch_type dwt_reg_type = {
1633 .get = cortex_m3_dwt_get_reg,
1634 .set = cortex_m3_dwt_set_reg,
1635 };
1636
1637 static void
1638 cortex_m3_dwt_addreg(struct target *t, struct reg *r, struct dwt_reg *d)
1639 {
1640 struct dwt_reg_state *state;
1641
1642 state = calloc(1, sizeof *state);
1643 if (!state)
1644 return;
1645 state->addr = d->addr;
1646 state->target = t;
1647
1648 r->name = d->name;
1649 r->size = d->size;
1650 r->value = &state->value;
1651 r->arch_info = state;
1652 r->type = &dwt_reg_type;
1653 }
1654
1655 static void
1656 cortex_m3_dwt_setup(struct cortex_m3_common *cm3, struct target *target)
1657 {
1658 uint32_t dwtcr;
1659 struct reg_cache *cache;
1660 struct cortex_m3_dwt_comparator *comparator;
1661 int reg, i;
1662
1663 target_read_u32(target, DWT_CTRL, &dwtcr);
1664 if (!dwtcr) {
1665 LOG_DEBUG("no DWT");
1666 return;
1667 }
1668
1669 cm3->dwt_num_comp = (dwtcr >> 28) & 0xF;
1670 cm3->dwt_comp_available = cm3->dwt_num_comp;
1671 cm3->dwt_comparator_list = calloc(cm3->dwt_num_comp,
1672 sizeof(struct cortex_m3_dwt_comparator));
1673 if (!cm3->dwt_comparator_list) {
1674 fail0:
1675 cm3->dwt_num_comp = 0;
1676 LOG_ERROR("out of mem");
1677 return;
1678 }
1679
1680 cache = calloc(1, sizeof *cache);
1681 if (!cache) {
1682 fail1:
1683 free(cm3->dwt_comparator_list);
1684 goto fail0;
1685 }
1686 cache->name = "cortex-m3 dwt registers";
1687 cache->num_regs = 2 + cm3->dwt_num_comp * 3;
1688 cache->reg_list = calloc(cache->num_regs, sizeof *cache->reg_list);
1689 if (!cache->reg_list) {
1690 free(cache);
1691 goto fail1;
1692 }
1693
1694 for (reg = 0; reg < 2; reg++)
1695 cortex_m3_dwt_addreg(target, cache->reg_list + reg,
1696 dwt_base_regs + reg);
1697
1698 comparator = cm3->dwt_comparator_list;
1699 for (i = 0; i < cm3->dwt_num_comp; i++, comparator++) {
1700 int j;
1701
1702 comparator->dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1703 for (j = 0; j < 3; j++, reg++)
1704 cortex_m3_dwt_addreg(target, cache->reg_list + reg,
1705 dwt_comp + 3 * i + j);
1706 }
1707
1708 *register_get_last_cache_p(&target->reg_cache) = cache;
1709 cm3->dwt_cache = cache;
1710
1711 LOG_DEBUG("DWT dwtcr 0x%" PRIx32 ", comp %d, watch%s",
1712 dwtcr, cm3->dwt_num_comp,
1713 (dwtcr & (0xf << 24)) ? " only" : "/trigger");
1714
1715 /* REVISIT: if num_comp > 1, check whether comparator #1 can
1716 * implement single-address data value watchpoints ... so we
1717 * won't need to check it later, when asked to set one up.
1718 */
1719 }
1720
1721 static int cortex_m3_examine(struct target *target)
1722 {
1723 int retval;
1724 uint32_t cpuid, fpcr;
1725 int i;
1726 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1727 struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
1728
1729 if ((retval = ahbap_debugport_init(swjdp)) != ERROR_OK)
1730 return retval;
1731
1732 if (!target_was_examined(target))
1733 {
1734 target_set_examined(target);
1735
1736 /* Read from Device Identification Registers */
1737 retval = target_read_u32(target, CPUID, &cpuid);
1738 if (retval != ERROR_OK)
1739 return retval;
1740
1741 if (((cpuid >> 4) & 0xc3f) == 0xc23)
1742 LOG_DEBUG("Cortex-M3 r%" PRId8 "p%" PRId8 " processor detected",
1743 (uint8_t)((cpuid >> 20) & 0xf), (uint8_t)((cpuid >> 0) & 0xf));
1744 LOG_DEBUG("cpuid: 0x%8.8" PRIx32 "", cpuid);
1745
1746 /* NOTE: FPB and DWT are both optional. */
1747
1748 /* Setup FPB */
1749 target_read_u32(target, FP_CTRL, &fpcr);
1750 cortex_m3->auto_bp_type = 1;
1751 cortex_m3->fp_num_code = ((fpcr >> 8) & 0x70) | ((fpcr >> 4) & 0xF); /* bits [14:12] and [7:4] */
1752 cortex_m3->fp_num_lit = (fpcr >> 8) & 0xF;
1753 cortex_m3->fp_code_available = cortex_m3->fp_num_code;
1754 cortex_m3->fp_comparator_list = calloc(cortex_m3->fp_num_code + cortex_m3->fp_num_lit, sizeof(struct cortex_m3_fp_comparator));
1755 cortex_m3->fpb_enabled = fpcr & 1;
1756 for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
1757 {
1758 cortex_m3->fp_comparator_list[i].type = (i < cortex_m3->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
1759 cortex_m3->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
1760 }
1761 LOG_DEBUG("FPB fpcr 0x%" PRIx32 ", numcode %i, numlit %i", fpcr, cortex_m3->fp_num_code, cortex_m3->fp_num_lit);
1762
1763 /* Setup DWT */
1764 cortex_m3_dwt_setup(cortex_m3, target);
1765
1766 /* These hardware breakpoints only work for code in flash! */
1767 LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
1768 target_name(target),
1769 cortex_m3->fp_num_code,
1770 cortex_m3->dwt_num_comp);
1771 }
1772
1773 return ERROR_OK;
1774 }
1775
1776 static int cortex_m3_dcc_read(struct adiv5_dap *swjdp, uint8_t *value, uint8_t *ctrl)
1777 {
1778 uint16_t dcrdr;
1779
1780 mem_ap_read_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1781 *ctrl = (uint8_t)dcrdr;
1782 *value = (uint8_t)(dcrdr >> 8);
1783
1784 LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
1785
1786 /* write ack back to software dcc register
1787 * signify we have read data */
1788 if (dcrdr & (1 << 0))
1789 {
1790 dcrdr = 0;
1791 mem_ap_write_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1792 }
1793
1794 return ERROR_OK;
1795 }
1796
1797 static int cortex_m3_target_request_data(struct target *target,
1798 uint32_t size, uint8_t *buffer)
1799 {
1800 struct armv7m_common *armv7m = target_to_armv7m(target);
1801 struct adiv5_dap *swjdp = &armv7m->dap;
1802 uint8_t data;
1803 uint8_t ctrl;
1804 uint32_t i;
1805
1806 for (i = 0; i < (size * 4); i++)
1807 {
1808 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1809 buffer[i] = data;
1810 }
1811
1812 return ERROR_OK;
1813 }
1814
1815 static int cortex_m3_handle_target_request(void *priv)
1816 {
1817 struct target *target = priv;
1818 if (!target_was_examined(target))
1819 return ERROR_OK;
1820 struct armv7m_common *armv7m = target_to_armv7m(target);
1821 struct adiv5_dap *swjdp = &armv7m->dap;
1822
1823 if (!target->dbg_msg_enabled)
1824 return ERROR_OK;
1825
1826 if (target->state == TARGET_RUNNING)
1827 {
1828 uint8_t data;
1829 uint8_t ctrl;
1830
1831 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1832
1833 /* check if we have data */
1834 if (ctrl & (1 << 0))
1835 {
1836 uint32_t request;
1837
1838 /* we assume target is quick enough */
1839 request = data;
1840 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1841 request |= (data << 8);
1842 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1843 request |= (data << 16);
1844 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1845 request |= (data << 24);
1846 target_request(target, request);
1847 }
1848 }
1849
1850 return ERROR_OK;
1851 }
1852
1853 static int cortex_m3_init_arch_info(struct target *target,
1854 struct cortex_m3_common *cortex_m3, struct jtag_tap *tap)
1855 {
1856 int retval;
1857 struct armv7m_common *armv7m = &cortex_m3->armv7m;
1858
1859 armv7m_init_arch_info(target, armv7m);
1860
1861 /* prepare JTAG information for the new target */
1862 cortex_m3->jtag_info.tap = tap;
1863 cortex_m3->jtag_info.scann_size = 4;
1864
1865 armv7m->arm.dap = &armv7m->dap;
1866
1867 /* Leave (only) generic DAP stuff for debugport_init(); */
1868 armv7m->dap.jtag_info = &cortex_m3->jtag_info;
1869 armv7m->dap.memaccess_tck = 8;
1870 /* Cortex-M3 has 4096 bytes autoincrement range */
1871 armv7m->dap.tar_autoincr_block = (1 << 12);
1872
1873 /* register arch-specific functions */
1874 armv7m->examine_debug_reason = cortex_m3_examine_debug_reason;
1875
1876 armv7m->post_debug_entry = NULL;
1877
1878 armv7m->pre_restore_context = NULL;
1879
1880 armv7m->load_core_reg_u32 = cortex_m3_load_core_reg_u32;
1881 armv7m->store_core_reg_u32 = cortex_m3_store_core_reg_u32;
1882
1883 target_register_timer_callback(cortex_m3_handle_target_request, 1, 1, target);
1884
1885 if ((retval = arm_jtag_setup_connection(&cortex_m3->jtag_info)) != ERROR_OK)
1886 {
1887 return retval;
1888 }
1889
1890 return ERROR_OK;
1891 }
1892
1893 static int cortex_m3_target_create(struct target *target, Jim_Interp *interp)
1894 {
1895 struct cortex_m3_common *cortex_m3 = calloc(1,sizeof(struct cortex_m3_common));
1896
1897 cortex_m3->common_magic = CORTEX_M3_COMMON_MAGIC;
1898 cortex_m3_init_arch_info(target, cortex_m3, target->tap);
1899
1900 return ERROR_OK;
1901 }
1902
1903 /*--------------------------------------------------------------------------*/
1904
1905 static int cortex_m3_verify_pointer(struct command_context *cmd_ctx,
1906 struct cortex_m3_common *cm3)
1907 {
1908 if (cm3->common_magic != CORTEX_M3_COMMON_MAGIC) {
1909 command_print(cmd_ctx, "target is not a Cortex-M3");
1910 return ERROR_TARGET_INVALID;
1911 }
1912 return ERROR_OK;
1913 }
1914
1915 /*
1916 * Only stuff below this line should need to verify that its target
1917 * is a Cortex-M3. Everything else should have indirected through the
1918 * cortexm3_target structure, which is only used with CM3 targets.
1919 */
1920
1921 static const struct {
1922 char name[10];
1923 unsigned mask;
1924 } vec_ids[] = {
1925 { "hard_err", VC_HARDERR, },
1926 { "int_err", VC_INTERR, },
1927 { "bus_err", VC_BUSERR, },
1928 { "state_err", VC_STATERR, },
1929 { "chk_err", VC_CHKERR, },
1930 { "nocp_err", VC_NOCPERR, },
1931 { "mm_err", VC_MMERR, },
1932 { "reset", VC_CORERESET, },
1933 };
1934
1935 COMMAND_HANDLER(handle_cortex_m3_vector_catch_command)
1936 {
1937 struct target *target = get_current_target(CMD_CTX);
1938 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
1939 struct armv7m_common *armv7m = &cortex_m3->armv7m;
1940 struct adiv5_dap *swjdp = &armv7m->dap;
1941 uint32_t demcr = 0;
1942 int retval;
1943
1944 retval = cortex_m3_verify_pointer(CMD_CTX, cortex_m3);
1945 if (retval != ERROR_OK)
1946 return retval;
1947
1948 mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &demcr);
1949
1950 if (CMD_ARGC > 0) {
1951 unsigned catch = 0;
1952
1953 if (CMD_ARGC == 1) {
1954 if (strcmp(CMD_ARGV[0], "all") == 0) {
1955 catch = VC_HARDERR | VC_INTERR | VC_BUSERR
1956 | VC_STATERR | VC_CHKERR | VC_NOCPERR
1957 | VC_MMERR | VC_CORERESET;
1958 goto write;
1959 } else if (strcmp(CMD_ARGV[0], "none") == 0) {
1960 goto write;
1961 }
1962 }
1963 while (CMD_ARGC-- > 0) {
1964 unsigned i;
1965 for (i = 0; i < ARRAY_SIZE(vec_ids); i++) {
1966 if (strcmp(CMD_ARGV[CMD_ARGC], vec_ids[i].name) != 0)
1967 continue;
1968 catch |= vec_ids[i].mask;
1969 break;
1970 }
1971 if (i == ARRAY_SIZE(vec_ids)) {
1972 LOG_ERROR("No CM3 vector '%s'", CMD_ARGV[CMD_ARGC]);
1973 return ERROR_INVALID_ARGUMENTS;
1974 }
1975 }
1976 write:
1977 /* For now, armv7m->demcr only stores vector catch flags. */
1978 armv7m->demcr = catch;
1979
1980 demcr &= ~0xffff;
1981 demcr |= catch;
1982
1983 /* write, but don't assume it stuck (why not??) */
1984 mem_ap_write_u32(swjdp, DCB_DEMCR, demcr);
1985 mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &demcr);
1986
1987 /* FIXME be sure to clear DEMCR on clean server shutdown.
1988 * Otherwise the vector catch hardware could fire when there's
1989 * no debugger hooked up, causing much confusion...
1990 */
1991 }
1992
1993 for (unsigned i = 0; i < ARRAY_SIZE(vec_ids); i++)
1994 {
1995 command_print(CMD_CTX, "%9s: %s", vec_ids[i].name,
1996 (demcr & vec_ids[i].mask) ? "catch" : "ignore");
1997 }
1998
1999 return ERROR_OK;
2000 }
2001
2002 COMMAND_HANDLER(handle_cortex_m3_mask_interrupts_command)
2003 {
2004 struct target *target = get_current_target(CMD_CTX);
2005 struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
2006 int retval;
2007
2008 retval = cortex_m3_verify_pointer(CMD_CTX, cortex_m3);
2009 if (retval != ERROR_OK)
2010 return retval;
2011
2012 if (target->state != TARGET_HALTED)
2013 {
2014 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
2015 return ERROR_OK;
2016 }
2017
2018 if (CMD_ARGC > 0)
2019 {
2020 bool enable;
2021 COMMAND_PARSE_ON_OFF(CMD_ARGV[0], enable);
2022 uint32_t mask_on = C_HALT | (enable ? C_MASKINTS : 0);
2023 uint32_t mask_off = enable ? 0 : C_MASKINTS;
2024 cortex_m3_write_debug_halt_mask(target, mask_on, mask_off);
2025 }
2026
2027 command_print(CMD_CTX, "cortex_m3 interrupt mask %s",
2028 (cortex_m3->dcb_dhcsr & C_MASKINTS) ? "on" : "off");
2029
2030 return ERROR_OK;
2031 }
2032
2033 static const struct command_registration cortex_m3_exec_command_handlers[] = {
2034 {
2035 .name = "maskisr",
2036 .handler = handle_cortex_m3_mask_interrupts_command,
2037 .mode = COMMAND_EXEC,
2038 .help = "mask cortex_m3 interrupts",
2039 .usage = "['on'|'off']",
2040 },
2041 {
2042 .name = "vector_catch",
2043 .handler = handle_cortex_m3_vector_catch_command,
2044 .mode = COMMAND_EXEC,
2045 .help = "configure hardware vectors to trigger debug entry",
2046 .usage = "['all'|'none'|('bus_err'|'chk_err'|...)*]",
2047 },
2048 COMMAND_REGISTRATION_DONE
2049 };
2050 static const struct command_registration cortex_m3_command_handlers[] = {
2051 {
2052 .chain = armv7m_command_handlers,
2053 },
2054 {
2055 .name = "cortex_m3",
2056 .mode = COMMAND_EXEC,
2057 .help = "Cortex-M3 command group",
2058 .chain = cortex_m3_exec_command_handlers,
2059 },
2060 COMMAND_REGISTRATION_DONE
2061 };
2062
2063 struct target_type cortexm3_target =
2064 {
2065 .name = "cortex_m3",
2066
2067 .poll = cortex_m3_poll,
2068 .arch_state = armv7m_arch_state,
2069
2070 .target_request_data = cortex_m3_target_request_data,
2071
2072 .halt = cortex_m3_halt,
2073 .resume = cortex_m3_resume,
2074 .step = cortex_m3_step,
2075
2076 .assert_reset = cortex_m3_assert_reset,
2077 .deassert_reset = cortex_m3_deassert_reset,
2078 .soft_reset_halt = cortex_m3_soft_reset_halt,
2079
2080 .get_gdb_reg_list = armv7m_get_gdb_reg_list,
2081
2082 .read_memory = cortex_m3_read_memory,
2083 .write_memory = cortex_m3_write_memory,
2084 .bulk_write_memory = cortex_m3_bulk_write_memory,
2085 .checksum_memory = armv7m_checksum_memory,
2086 .blank_check_memory = armv7m_blank_check_memory,
2087
2088 .run_algorithm = armv7m_run_algorithm,
2089
2090 .add_breakpoint = cortex_m3_add_breakpoint,
2091 .remove_breakpoint = cortex_m3_remove_breakpoint,
2092 .add_watchpoint = cortex_m3_add_watchpoint,
2093 .remove_watchpoint = cortex_m3_remove_watchpoint,
2094
2095 .commands = cortex_m3_command_handlers,
2096 .target_create = cortex_m3_target_create,
2097 .init_target = cortex_m3_init_target,
2098 .examine = cortex_m3_examine,
2099 };
Unoffical Testing Grounds for Dean Glazeski