ARMv7-M: no exit() calls
[openocd.git] / src / target / armv7m.c
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 * Copyright (C) 2007,2008 √ėyvind Harboe *
12 * oyvind.harboe@zylin.com *
13 * *
14 * This program is free software; you can redistribute it and/or modify *
15 * it under the terms of the GNU General Public License as published by *
16 * the Free Software Foundation; either version 2 of the License, or *
17 * (at your option) any later version. *
18 * *
19 * This program is distributed in the hope that it will be useful, *
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
22 * GNU General Public License for more details. *
23 * *
24 * You should have received a copy of the GNU General Public License *
25 * along with this program; if not, write to the *
26 * Free Software Foundation, Inc., *
27 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
28 * *
29 * ARMv7-M Architecture, Application Level Reference Manual *
30 * ARM DDI 0405C (September 2008) *
31 * *
32 ***************************************************************************/
33 #ifdef HAVE_CONFIG_H
34 #include "config.h"
35 #endif
36
37 #include "breakpoints.h"
38 #include "target.h"
39 #include "armv7m.h"
40 #include "algorithm.h"
41 #include "register.h"
42
43
44 #if 0
45 #define _DEBUG_INSTRUCTION_EXECUTION_
46 #endif
47
48 /** Maps from enum armv7m_mode (except ARMV7M_MODE_ANY) to name. */
49 char *armv7m_mode_strings[] =
50 {
51 "Thread", "Thread (User)", "Handler",
52 };
53
54 static char *armv7m_exception_strings[] =
55 {
56 "", "Reset", "NMI", "HardFault",
57 "MemManage", "BusFault", "UsageFault", "RESERVED",
58 "RESERVED", "RESERVED", "RESERVED", "SVCall",
59 "DebugMonitor", "RESERVED", "PendSV", "SysTick"
60 };
61
62 /* FIXME these dummies are IDENTICAL to the armv4_5, arm11, and armv7a
63 * ones... except for naming/scoping
64 */
65 static uint8_t armv7m_gdb_dummy_fp_value[12];
66
67 static struct reg armv7m_gdb_dummy_fp_reg =
68 {
69 .name = "GDB dummy floating-point register",
70 .value = armv7m_gdb_dummy_fp_value,
71 .dirty = 0,
72 .valid = 1,
73 .size = 96,
74 .arch_info = NULL,
75 .arch_type = 0,
76 };
77
78 static uint8_t armv7m_gdb_dummy_fps_value[4];
79
80 static struct reg armv7m_gdb_dummy_fps_reg =
81 {
82 .name = "GDB dummy floating-point status register",
83 .value = armv7m_gdb_dummy_fps_value,
84 .dirty = 0,
85 .valid = 1,
86 .size = 32,
87 .arch_info = NULL,
88 .arch_type = 0,
89 };
90
91 #ifdef ARMV7_GDB_HACKS
92 uint8_t armv7m_gdb_dummy_cpsr_value[] = {0, 0, 0, 0};
93
94 struct reg armv7m_gdb_dummy_cpsr_reg =
95 {
96 .name = "GDB dummy cpsr register",
97 .value = armv7m_gdb_dummy_cpsr_value,
98 .dirty = 0,
99 .valid = 1,
100 .size = 32,
101 .arch_info = NULL,
102 .arch_type = 0,
103 };
104 #endif
105
106 /*
107 * These registers are not memory-mapped. The ARMv7-M profile includes
108 * memory mapped registers too, such as for the NVIC (interrupt controller)
109 * and SysTick (timer) modules; those can mostly be treated as peripherals.
110 *
111 * The ARMv6-M profile is almost identical in this respect, except that it
112 * doesn't include basepri or faultmask registers.
113 */
114 static const struct {
115 unsigned id;
116 char *name;
117 unsigned bits;
118 } armv7m_regs[] = {
119 { ARMV7M_R0, "r0", 32 },
120 { ARMV7M_R1, "r1", 32 },
121 { ARMV7M_R2, "r2", 32 },
122 { ARMV7M_R3, "r3", 32 },
123
124 { ARMV7M_R4, "r4", 32 },
125 { ARMV7M_R5, "r5", 32 },
126 { ARMV7M_R6, "r6", 32 },
127 { ARMV7M_R7, "r7", 32 },
128
129 { ARMV7M_R8, "r8", 32 },
130 { ARMV7M_R9, "r9", 32 },
131 { ARMV7M_R10, "r10", 32 },
132 { ARMV7M_R11, "r11", 32 },
133
134 { ARMV7M_R12, "r12", 32 },
135 { ARMV7M_R13, "sp", 32 },
136 { ARMV7M_R14, "lr", 32 },
137 { ARMV7M_PC, "pc", 32 },
138
139 { ARMV7M_xPSR, "xPSR", 32 },
140 { ARMV7M_MSP, "msp", 32 },
141 { ARMV7M_PSP, "psp", 32 },
142
143 { ARMV7M_PRIMASK, "primask", 1 },
144 { ARMV7M_BASEPRI, "basepri", 8 },
145 { ARMV7M_FAULTMASK, "faultmask", 1 },
146 { ARMV7M_CONTROL, "control", 2 },
147 };
148
149 #define ARMV7M_NUM_REGS ARRAY_SIZE(armv7m_regs)
150
151 static int armv7m_core_reg_arch_type = -1;
152
153 /**
154 * Restores target context using the cache of core registers set up
155 * by armv7m_build_reg_cache(), calling optional core-specific hooks.
156 */
157 int armv7m_restore_context(struct target *target)
158 {
159 int i;
160 struct armv7m_common *armv7m = target_to_armv7m(target);
161
162 LOG_DEBUG(" ");
163
164 if (armv7m->pre_restore_context)
165 armv7m->pre_restore_context(target);
166
167 for (i = ARMV7M_NUM_REGS - 1; i >= 0; i--)
168 {
169 if (armv7m->core_cache->reg_list[i].dirty)
170 {
171 armv7m->write_core_reg(target, i);
172 }
173 }
174
175 if (armv7m->post_restore_context)
176 armv7m->post_restore_context(target);
177
178 return ERROR_OK;
179 }
180
181 /* Core state functions */
182
183 /**
184 * Maps ISR number (from xPSR) to name.
185 * Note that while names and meanings for the first sixteen are standardized
186 * (with zero not a true exception), external interrupts are only numbered.
187 * They are assigned by vendors, which generally assign different numbers to
188 * peripherals (such as UART0 or a USB peripheral controller).
189 */
190 char *armv7m_exception_string(int number)
191 {
192 static char enamebuf[32];
193
194 if ((number < 0) | (number > 511))
195 return "Invalid exception";
196 if (number < 16)
197 return armv7m_exception_strings[number];
198 sprintf(enamebuf, "External Interrupt(%i)", number - 16);
199 return enamebuf;
200 }
201
202 static int armv7m_get_core_reg(struct reg *reg)
203 {
204 int retval;
205 struct armv7m_core_reg *armv7m_reg = reg->arch_info;
206 struct target *target = armv7m_reg->target;
207 struct armv7m_common *armv7m = target_to_armv7m(target);
208
209 if (target->state != TARGET_HALTED)
210 {
211 return ERROR_TARGET_NOT_HALTED;
212 }
213
214 retval = armv7m->read_core_reg(target, armv7m_reg->num);
215
216 return retval;
217 }
218
219 static int armv7m_set_core_reg(struct reg *reg, uint8_t *buf)
220 {
221 struct armv7m_core_reg *armv7m_reg = reg->arch_info;
222 struct target *target = armv7m_reg->target;
223 uint32_t value = buf_get_u32(buf, 0, 32);
224
225 if (target->state != TARGET_HALTED)
226 {
227 return ERROR_TARGET_NOT_HALTED;
228 }
229
230 buf_set_u32(reg->value, 0, 32, value);
231 reg->dirty = 1;
232 reg->valid = 1;
233
234 return ERROR_OK;
235 }
236
237 static int armv7m_read_core_reg(struct target *target, unsigned num)
238 {
239 uint32_t reg_value;
240 int retval;
241 struct armv7m_core_reg * armv7m_core_reg;
242 struct armv7m_common *armv7m = target_to_armv7m(target);
243
244 if (num >= ARMV7M_NUM_REGS)
245 return ERROR_INVALID_ARGUMENTS;
246
247 armv7m_core_reg = armv7m->core_cache->reg_list[num].arch_info;
248 retval = armv7m->load_core_reg_u32(target, armv7m_core_reg->type, armv7m_core_reg->num, &reg_value);
249 buf_set_u32(armv7m->core_cache->reg_list[num].value, 0, 32, reg_value);
250 armv7m->core_cache->reg_list[num].valid = 1;
251 armv7m->core_cache->reg_list[num].dirty = 0;
252
253 return retval;
254 }
255
256 static int armv7m_write_core_reg(struct target *target, unsigned num)
257 {
258 int retval;
259 uint32_t reg_value;
260 struct armv7m_core_reg *armv7m_core_reg;
261 struct armv7m_common *armv7m = target_to_armv7m(target);
262
263 if (num >= ARMV7M_NUM_REGS)
264 return ERROR_INVALID_ARGUMENTS;
265
266 reg_value = buf_get_u32(armv7m->core_cache->reg_list[num].value, 0, 32);
267 armv7m_core_reg = armv7m->core_cache->reg_list[num].arch_info;
268 retval = armv7m->store_core_reg_u32(target, armv7m_core_reg->type, armv7m_core_reg->num, reg_value);
269 if (retval != ERROR_OK)
270 {
271 LOG_ERROR("JTAG failure");
272 armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
273 return ERROR_JTAG_DEVICE_ERROR;
274 }
275 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", num , reg_value);
276 armv7m->core_cache->reg_list[num].valid = 1;
277 armv7m->core_cache->reg_list[num].dirty = 0;
278
279 return ERROR_OK;
280 }
281
282 /** Invalidates cache of core registers set up by armv7m_build_reg_cache(). */
283 int armv7m_invalidate_core_regs(struct target *target)
284 {
285 struct armv7m_common *armv7m = target_to_armv7m(target);
286 int i;
287
288 for (i = 0; i < armv7m->core_cache->num_regs; i++)
289 {
290 armv7m->core_cache->reg_list[i].valid = 0;
291 armv7m->core_cache->reg_list[i].dirty = 0;
292 }
293
294 return ERROR_OK;
295 }
296
297 /**
298 * Returns generic ARM userspace registers to GDB.
299 * GDB doesn't quite understand that most ARMs don't have floating point
300 * hardware, so this also fakes a set of long-obsolete FPA registers that
301 * are not used in EABI based software stacks.
302 */
303 int armv7m_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int *reg_list_size)
304 {
305 struct armv7m_common *armv7m = target_to_armv7m(target);
306 int i;
307
308 *reg_list_size = 26;
309 *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
310
311 /*
312 * GDB register packet format for ARM:
313 * - the first 16 registers are r0..r15
314 * - (obsolete) 8 FPA registers
315 * - (obsolete) FPA status
316 * - CPSR
317 */
318 for (i = 0; i < 16; i++)
319 {
320 (*reg_list)[i] = &armv7m->core_cache->reg_list[i];
321 }
322
323 for (i = 16; i < 24; i++)
324 {
325 (*reg_list)[i] = &armv7m_gdb_dummy_fp_reg;
326 }
327
328 (*reg_list)[24] = &armv7m_gdb_dummy_fps_reg;
329
330 #ifdef ARMV7_GDB_HACKS
331 /* use dummy cpsr reg otherwise gdb may try and set the thumb bit */
332 (*reg_list)[25] = &armv7m_gdb_dummy_cpsr_reg;
333
334 /* ARMV7M is always in thumb mode, try to make GDB understand this
335 * if it does not support this arch */
336 *((char*)armv7m->core_cache->reg_list[15].value) |= 1;
337 #else
338 (*reg_list)[25] = &armv7m->core_cache->reg_list[ARMV7M_xPSR];
339 #endif
340
341 return ERROR_OK;
342 }
343
344 /* run to exit point. return error if exit point was not reached. */
345 static int armv7m_run_and_wait(struct target *target, uint32_t entry_point, int timeout_ms, uint32_t exit_point, struct armv7m_common *armv7m)
346 {
347 uint32_t pc;
348 int retval;
349 /* This code relies on the target specific resume() and poll()->debug_entry()
350 * sequence to write register values to the processor and the read them back */
351 if ((retval = target_resume(target, 0, entry_point, 1, 1)) != ERROR_OK)
352 {
353 return retval;
354 }
355
356 retval = target_wait_state(target, TARGET_HALTED, timeout_ms);
357 /* If the target fails to halt due to the breakpoint, force a halt */
358 if (retval != ERROR_OK || target->state != TARGET_HALTED)
359 {
360 if ((retval = target_halt(target)) != ERROR_OK)
361 return retval;
362 if ((retval = target_wait_state(target, TARGET_HALTED, 500)) != ERROR_OK)
363 {
364 return retval;
365 }
366 return ERROR_TARGET_TIMEOUT;
367 }
368
369 armv7m->load_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 15, &pc);
370 if (pc != exit_point)
371 {
372 LOG_DEBUG("failed algoritm halted at 0x%" PRIx32 " ", pc);
373 return ERROR_TARGET_TIMEOUT;
374 }
375
376 return ERROR_OK;
377 }
378
379 /** Runs a Thumb algorithm in the target. */
380 int armv7m_run_algorithm(struct target *target,
381 int num_mem_params, struct mem_param *mem_params,
382 int num_reg_params, struct reg_param *reg_params,
383 uint32_t entry_point, uint32_t exit_point,
384 int timeout_ms, void *arch_info)
385 {
386 struct armv7m_common *armv7m = target_to_armv7m(target);
387 struct armv7m_algorithm *armv7m_algorithm_info = arch_info;
388 enum armv7m_mode core_mode = armv7m->core_mode;
389 int retval = ERROR_OK;
390 uint32_t context[ARMV7M_NUM_REGS];
391
392 if (armv7m_algorithm_info->common_magic != ARMV7M_COMMON_MAGIC)
393 {
394 LOG_ERROR("current target isn't an ARMV7M target");
395 return ERROR_TARGET_INVALID;
396 }
397
398 if (target->state != TARGET_HALTED)
399 {
400 LOG_WARNING("target not halted");
401 return ERROR_TARGET_NOT_HALTED;
402 }
403
404 /* refresh core register cache */
405 /* Not needed if core register cache is always consistent with target process state */
406 for (unsigned i = 0; i < ARMV7M_NUM_REGS; i++)
407 {
408 if (!armv7m->core_cache->reg_list[i].valid)
409 armv7m->read_core_reg(target, i);
410 context[i] = buf_get_u32(armv7m->core_cache->reg_list[i].value, 0, 32);
411 }
412
413 for (int i = 0; i < num_mem_params; i++)
414 {
415 if ((retval = target_write_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
416 return retval;
417 }
418
419 for (int i = 0; i < num_reg_params; i++)
420 {
421 struct reg *reg = register_get_by_name(armv7m->core_cache, reg_params[i].reg_name, 0);
422 // uint32_t regvalue;
423
424 if (!reg)
425 {
426 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
427 return ERROR_INVALID_ARGUMENTS;
428 }
429
430 if (reg->size != reg_params[i].size)
431 {
432 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
433 return ERROR_INVALID_ARGUMENTS;
434 }
435
436 // regvalue = buf_get_u32(reg_params[i].value, 0, 32);
437 armv7m_set_core_reg(reg, reg_params[i].value);
438 }
439
440 if (armv7m_algorithm_info->core_mode != ARMV7M_MODE_ANY)
441 {
442 LOG_DEBUG("setting core_mode: 0x%2.2x", armv7m_algorithm_info->core_mode);
443 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value,
444 0, 1, armv7m_algorithm_info->core_mode);
445 armv7m->core_cache->reg_list[ARMV7M_CONTROL].dirty = 1;
446 armv7m->core_cache->reg_list[ARMV7M_CONTROL].valid = 1;
447 }
448
449 /* REVISIT speed things up (3% or so in one case) by requiring
450 * algorithms to include a BKPT instruction at each exit point.
451 * This eliminates overheads of adding/removing a breakpoint.
452 */
453
454 /* ARMV7M always runs in Thumb state */
455 if ((retval = breakpoint_add(target, exit_point, 2, BKPT_SOFT)) != ERROR_OK)
456 {
457 LOG_ERROR("can't add breakpoint to finish algorithm execution");
458 return ERROR_TARGET_FAILURE;
459 }
460
461 retval = armv7m_run_and_wait(target, entry_point, timeout_ms, exit_point, armv7m);
462
463 breakpoint_remove(target, exit_point);
464
465 if (retval != ERROR_OK)
466 {
467 return retval;
468 }
469
470 /* Read memory values to mem_params[] */
471 for (int i = 0; i < num_mem_params; i++)
472 {
473 if (mem_params[i].direction != PARAM_OUT)
474 if ((retval = target_read_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
475 {
476 return retval;
477 }
478 }
479
480 /* Copy core register values to reg_params[] */
481 for (int i = 0; i < num_reg_params; i++)
482 {
483 if (reg_params[i].direction != PARAM_OUT)
484 {
485 struct reg *reg = register_get_by_name(armv7m->core_cache, reg_params[i].reg_name, 0);
486
487 if (!reg)
488 {
489 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
490 return ERROR_INVALID_ARGUMENTS;
491 }
492
493 if (reg->size != reg_params[i].size)
494 {
495 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
496 return ERROR_INVALID_ARGUMENTS;
497 }
498
499 buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
500 }
501 }
502
503 for (int i = ARMV7M_NUM_REGS - 1; i >= 0; i--)
504 {
505 uint32_t regvalue;
506 regvalue = buf_get_u32(armv7m->core_cache->reg_list[i].value, 0, 32);
507 if (regvalue != context[i])
508 {
509 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32,
510 armv7m->core_cache->reg_list[i].name, context[i]);
511 buf_set_u32(armv7m->core_cache->reg_list[i].value,
512 0, 32, context[i]);
513 armv7m->core_cache->reg_list[i].valid = 1;
514 armv7m->core_cache->reg_list[i].dirty = 1;
515 }
516 }
517
518 armv7m->core_mode = core_mode;
519
520 return retval;
521 }
522
523 /** Logs summary of ARMv7-M state for a halted target. */
524 int armv7m_arch_state(struct target *target)
525 {
526 struct armv7m_common *armv7m = target_to_armv7m(target);
527 uint32_t ctrl, sp;
528
529 ctrl = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value, 0, 32);
530 sp = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_R13].value, 0, 32);
531
532 LOG_USER("target halted due to %s, current mode: %s %s\n"
533 "xPSR: %#8.8" PRIx32 " pc: %#8.8" PRIx32 " %csp: %#8.8" PRIx32,
534 Jim_Nvp_value2name_simple(nvp_target_debug_reason,
535 target->debug_reason)->name,
536 armv7m_mode_strings[armv7m->core_mode],
537 armv7m_exception_string(armv7m->exception_number),
538 buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32),
539 buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_PC].value, 0, 32),
540 (ctrl & 0x02) ? 'p' : 'm',
541 sp);
542
543 return ERROR_OK;
544 }
545
546 /** Builds cache of architecturally defined registers. */
547 struct reg_cache *armv7m_build_reg_cache(struct target *target)
548 {
549 struct armv7m_common *armv7m = target_to_armv7m(target);
550 int num_regs = ARMV7M_NUM_REGS;
551 struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
552 struct reg_cache *cache = malloc(sizeof(struct reg_cache));
553 struct reg *reg_list = calloc(num_regs, sizeof(struct reg));
554 struct armv7m_core_reg *arch_info = calloc(num_regs, sizeof(struct armv7m_core_reg));
555 int i;
556
557 if (armv7m_core_reg_arch_type == -1)
558 {
559 armv7m_core_reg_arch_type = register_reg_arch_type(armv7m_get_core_reg, armv7m_set_core_reg);
560 }
561
562 register_init_dummy(&armv7m_gdb_dummy_fps_reg);
563 #ifdef ARMV7_GDB_HACKS
564 register_init_dummy(&armv7m_gdb_dummy_cpsr_reg);
565 #endif
566 register_init_dummy(&armv7m_gdb_dummy_fp_reg);
567
568 /* Build the process context cache */
569 cache->name = "arm v7m registers";
570 cache->next = NULL;
571 cache->reg_list = reg_list;
572 cache->num_regs = num_regs;
573 (*cache_p) = cache;
574 armv7m->core_cache = cache;
575
576 for (i = 0; i < num_regs; i++)
577 {
578 arch_info[i].num = armv7m_regs[i].id;
579 arch_info[i].target = target;
580 arch_info[i].armv7m_common = armv7m;
581 reg_list[i].name = armv7m_regs[i].name;
582 reg_list[i].size = armv7m_regs[i].bits;
583 reg_list[i].value = calloc(1, 4);
584 reg_list[i].dirty = 0;
585 reg_list[i].valid = 0;
586 reg_list[i].arch_type = armv7m_core_reg_arch_type;
587 reg_list[i].arch_info = &arch_info[i];
588 }
589
590 return cache;
591 }
592
593 /** Sets up target as a generic ARMv7-M core */
594 int armv7m_init_arch_info(struct target *target, struct armv7m_common *armv7m)
595 {
596 /* register arch-specific functions */
597
598 target->arch_info = armv7m;
599 armv7m->read_core_reg = armv7m_read_core_reg;
600 armv7m->write_core_reg = armv7m_write_core_reg;
601
602 return ERROR_OK;
603 }
604
605 /** Generates a CRC32 checksum of a memory region. */
606 int armv7m_checksum_memory(struct target *target,
607 uint32_t address, uint32_t count, uint32_t* checksum)
608 {
609 struct working_area *crc_algorithm;
610 struct armv7m_algorithm armv7m_info;
611 struct reg_param reg_params[2];
612 int retval;
613
614 static const uint16_t cortex_m3_crc_code[] = {
615 0x4602, /* mov r2, r0 */
616 0xF04F, 0x30FF, /* mov r0, #0xffffffff */
617 0x460B, /* mov r3, r1 */
618 0xF04F, 0x0400, /* mov r4, #0 */
619 0xE013, /* b ncomp */
620 /* nbyte: */
621 0x5D11, /* ldrb r1, [r2, r4] */
622 0xF8DF, 0x7028, /* ldr r7, CRC32XOR */
623 0xEA80, 0x6001, /* eor r0, r0, r1, asl #24 */
624
625 0xF04F, 0x0500, /* mov r5, #0 */
626 /* loop: */
627 0x2800, /* cmp r0, #0 */
628 0xEA4F, 0x0640, /* mov r6, r0, asl #1 */
629 0xF105, 0x0501, /* add r5, r5, #1 */
630 0x4630, /* mov r0, r6 */
631 0xBFB8, /* it lt */
632 0xEA86, 0x0007, /* eor r0, r6, r7 */
633 0x2D08, /* cmp r5, #8 */
634 0xD1F4, /* bne loop */
635
636 0xF104, 0x0401, /* add r4, r4, #1 */
637 /* ncomp: */
638 0x429C, /* cmp r4, r3 */
639 0xD1E9, /* bne nbyte */
640 /* end: */
641 0xE7FE, /* b end */
642 0x1DB7, 0x04C1 /* CRC32XOR: .word 0x04C11DB7 */
643 };
644
645 uint32_t i;
646
647 if (target_alloc_working_area(target, sizeof(cortex_m3_crc_code), &crc_algorithm) != ERROR_OK)
648 {
649 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
650 }
651
652 /* convert flash writing code into a buffer in target endianness */
653 for (i = 0; i < (sizeof(cortex_m3_crc_code)/sizeof(uint16_t)); i++)
654 if ((retval = target_write_u16(target, crc_algorithm->address + i*sizeof(uint16_t), cortex_m3_crc_code[i])) != ERROR_OK)
655 {
656 return retval;
657 }
658
659 armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
660 armv7m_info.core_mode = ARMV7M_MODE_ANY;
661
662 init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
663 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
664
665 buf_set_u32(reg_params[0].value, 0, 32, address);
666 buf_set_u32(reg_params[1].value, 0, 32, count);
667
668 if ((retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
669 crc_algorithm->address, crc_algorithm->address + (sizeof(cortex_m3_crc_code)-6), 20000, &armv7m_info)) != ERROR_OK)
670 {
671 LOG_ERROR("error executing cortex_m3 crc algorithm");
672 destroy_reg_param(&reg_params[0]);
673 destroy_reg_param(&reg_params[1]);
674 target_free_working_area(target, crc_algorithm);
675 return retval;
676 }
677
678 *checksum = buf_get_u32(reg_params[0].value, 0, 32);
679
680 destroy_reg_param(&reg_params[0]);
681 destroy_reg_param(&reg_params[1]);
682
683 target_free_working_area(target, crc_algorithm);
684
685 return ERROR_OK;
686 }
687
688 /** Checks whether a memory region is zeroed. */
689 int armv7m_blank_check_memory(struct target *target,
690 uint32_t address, uint32_t count, uint32_t* blank)
691 {
692 struct working_area *erase_check_algorithm;
693 struct reg_param reg_params[3];
694 struct armv7m_algorithm armv7m_info;
695 int retval;
696 uint32_t i;
697
698 static const uint16_t erase_check_code[] =
699 {
700 /* loop: */
701 0xF810, 0x3B01, /* ldrb r3, [r0], #1 */
702 0xEA02, 0x0203, /* and r2, r2, r3 */
703 0x3901, /* subs r1, r1, #1 */
704 0xD1F9, /* bne loop */
705 /* end: */
706 0xE7FE, /* b end */
707 };
708
709 /* make sure we have a working area */
710 if (target_alloc_working_area(target, sizeof(erase_check_code), &erase_check_algorithm) != ERROR_OK)
711 {
712 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
713 }
714
715 /* convert flash writing code into a buffer in target endianness */
716 for (i = 0; i < (sizeof(erase_check_code)/sizeof(uint16_t)); i++)
717 target_write_u16(target, erase_check_algorithm->address + i*sizeof(uint16_t), erase_check_code[i]);
718
719 armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
720 armv7m_info.core_mode = ARMV7M_MODE_ANY;
721
722 init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
723 buf_set_u32(reg_params[0].value, 0, 32, address);
724
725 init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
726 buf_set_u32(reg_params[1].value, 0, 32, count);
727
728 init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
729 buf_set_u32(reg_params[2].value, 0, 32, 0xff);
730
731 if ((retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
732 erase_check_algorithm->address, erase_check_algorithm->address + (sizeof(erase_check_code)-2), 10000, &armv7m_info)) != ERROR_OK)
733 {
734 destroy_reg_param(&reg_params[0]);
735 destroy_reg_param(&reg_params[1]);
736 destroy_reg_param(&reg_params[2]);
737 target_free_working_area(target, erase_check_algorithm);
738 return 0;
739 }
740
741 *blank = buf_get_u32(reg_params[2].value, 0, 32);
742
743 destroy_reg_param(&reg_params[0]);
744 destroy_reg_param(&reg_params[1]);
745 destroy_reg_param(&reg_params[2]);
746
747 target_free_working_area(target, erase_check_algorithm);
748
749 return ERROR_OK;
750 }
751
752 /*--------------------------------------------------------------------------*/
753
754 /*
755 * Only stuff below this line should need to verify that its target
756 * is an ARMv7-M node.
757 *
758 * FIXME yet none of it _does_ verify target types yet!
759 */
760
761
762 /*
763 * Return the debug ap baseaddress in hexadecimal;
764 * no extra output to simplify script processing
765 */
766 COMMAND_HANDLER(handle_dap_baseaddr_command)
767 {
768 struct target *target = get_current_target(cmd_ctx);
769 struct armv7m_common *armv7m = target_to_armv7m(target);
770 struct swjdp_common *swjdp = &armv7m->swjdp_info;
771 uint32_t apsel, apselsave, baseaddr;
772 int retval;
773
774 apselsave = swjdp->apsel;
775 switch (argc) {
776 case 0:
777 apsel = swjdp->apsel;
778 break;
779 case 1:
780 COMMAND_PARSE_NUMBER(u32, args[0], apsel);
781 break;
782 default:
783 return ERROR_COMMAND_SYNTAX_ERROR;
784 }
785
786 if (apselsave != apsel)
787 dap_ap_select(swjdp, apsel);
788
789 dap_ap_read_reg_u32(swjdp, 0xF8, &baseaddr);
790 retval = swjdp_transaction_endcheck(swjdp);
791 command_print(cmd_ctx, "0x%8.8" PRIx32 "", baseaddr);
792
793 if (apselsave != apsel)
794 dap_ap_select(swjdp, apselsave);
795
796 return retval;
797 }
798
799 /*
800 * Return the debug ap id in hexadecimal;
801 * no extra output to simplify script processing
802 */
803 COMMAND_HANDLER(handle_dap_apid_command)
804 {
805 struct target *target = get_current_target(cmd_ctx);
806 struct armv7m_common *armv7m = target_to_armv7m(target);
807 struct swjdp_common *swjdp = &armv7m->swjdp_info;
808
809 return CALL_COMMAND_HANDLER(dap_apid_command, swjdp);
810 }
811
812 COMMAND_HANDLER(handle_dap_apsel_command)
813 {
814 struct target *target = get_current_target(cmd_ctx);
815 struct armv7m_common *armv7m = target_to_armv7m(target);
816 struct swjdp_common *swjdp = &armv7m->swjdp_info;
817
818 return CALL_COMMAND_HANDLER(dap_apsel_command, swjdp);
819 }
820
821 COMMAND_HANDLER(handle_dap_memaccess_command)
822 {
823 struct target *target = get_current_target(cmd_ctx);
824 struct armv7m_common *armv7m = target_to_armv7m(target);
825 struct swjdp_common *swjdp = &armv7m->swjdp_info;
826
827 return CALL_COMMAND_HANDLER(dap_memaccess_command, swjdp);
828 }
829
830
831 COMMAND_HANDLER(handle_dap_info_command)
832 {
833 struct target *target = get_current_target(cmd_ctx);
834 struct armv7m_common *armv7m = target_to_armv7m(target);
835 struct swjdp_common *swjdp = &armv7m->swjdp_info;
836 uint32_t apsel;
837
838 switch (argc) {
839 case 0:
840 apsel = swjdp->apsel;
841 break;
842 case 1:
843 COMMAND_PARSE_NUMBER(u32, args[0], apsel);
844 break;
845 default:
846 return ERROR_COMMAND_SYNTAX_ERROR;
847 }
848
849 return dap_info_command(cmd_ctx, swjdp, apsel);
850 }
851
852 /** Registers commands used to access DAP resources. */
853 int armv7m_register_commands(struct command_context *cmd_ctx)
854 {
855 struct command *arm_adi_v5_dap_cmd;
856
857 arm_adi_v5_dap_cmd = register_command(cmd_ctx, NULL, "dap",
858 NULL, COMMAND_ANY,
859 "cortex dap specific commands");
860
861 register_command(cmd_ctx, arm_adi_v5_dap_cmd, "info",
862 handle_dap_info_command, COMMAND_EXEC,
863 "Displays dap info for ap [num],"
864 "default currently selected AP");
865 register_command(cmd_ctx, arm_adi_v5_dap_cmd, "apsel",
866 handle_dap_apsel_command, COMMAND_EXEC,
867 "Select a different AP [num] (default 0)");
868 register_command(cmd_ctx, arm_adi_v5_dap_cmd, "apid",
869 handle_dap_apid_command, COMMAND_EXEC,
870 "Displays id reg from AP [num], "
871 "default currently selected AP");
872 register_command(cmd_ctx, arm_adi_v5_dap_cmd, "baseaddr",
873 handle_dap_baseaddr_command, COMMAND_EXEC,
874 "Displays debug base address from AP [num],"
875 "default currently selected AP");
876 register_command(cmd_ctx, arm_adi_v5_dap_cmd, "memaccess",
877 handle_dap_memaccess_command, COMMAND_EXEC,
878 "set/get number of extra tck for mem-ap "
879 "memory bus access [0-255]");
880
881 return ERROR_OK;
882 }

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