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 * Copyright (C) 2007,2008 Øyvind Harboe *
12 * oyvind.harboe@zylin.com *
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. *
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. *
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
29 * ARMv7-M Architecture, Application Level Reference Manual *
30 * ARM DDI 0405C (September 2008) *
32 ***************************************************************************/
38 #include "breakpoints.h"
40 #include "algorithm.h"
44 #define _DEBUG_INSTRUCTION_EXECUTION_
47 static char *armv7m_exception_strings
[] = {
48 "", "Reset", "NMI", "HardFault",
49 "MemManage", "BusFault", "UsageFault", "RESERVED",
50 "RESERVED", "RESERVED", "RESERVED", "SVCall",
51 "DebugMonitor", "RESERVED", "PendSV", "SysTick"
54 /* PSP is used in some thread modes */
55 const int armv7m_psp_reg_map
[17] = {
56 ARMV7M_R0
, ARMV7M_R1
, ARMV7M_R2
, ARMV7M_R3
,
57 ARMV7M_R4
, ARMV7M_R5
, ARMV7M_R6
, ARMV7M_R7
,
58 ARMV7M_R8
, ARMV7M_R9
, ARMV7M_R10
, ARMV7M_R11
,
59 ARMV7M_R12
, ARMV7M_PSP
, ARMV7M_R14
, ARMV7M_PC
,
63 /* MSP is used in handler and some thread modes */
64 const int armv7m_msp_reg_map
[17] = {
65 ARMV7M_R0
, ARMV7M_R1
, ARMV7M_R2
, ARMV7M_R3
,
66 ARMV7M_R4
, ARMV7M_R5
, ARMV7M_R6
, ARMV7M_R7
,
67 ARMV7M_R8
, ARMV7M_R9
, ARMV7M_R10
, ARMV7M_R11
,
68 ARMV7M_R12
, ARMV7M_MSP
, ARMV7M_R14
, ARMV7M_PC
,
73 * These registers are not memory-mapped. The ARMv7-M profile includes
74 * memory mapped registers too, such as for the NVIC (interrupt controller)
75 * and SysTick (timer) modules; those can mostly be treated as peripherals.
77 * The ARMv6-M profile is almost identical in this respect, except that it
78 * doesn't include basepri or faultmask registers.
85 { ARMV7M_R0
, "r0", 32 },
86 { ARMV7M_R1
, "r1", 32 },
87 { ARMV7M_R2
, "r2", 32 },
88 { ARMV7M_R3
, "r3", 32 },
90 { ARMV7M_R4
, "r4", 32 },
91 { ARMV7M_R5
, "r5", 32 },
92 { ARMV7M_R6
, "r6", 32 },
93 { ARMV7M_R7
, "r7", 32 },
95 { ARMV7M_R8
, "r8", 32 },
96 { ARMV7M_R9
, "r9", 32 },
97 { ARMV7M_R10
, "r10", 32 },
98 { ARMV7M_R11
, "r11", 32 },
100 { ARMV7M_R12
, "r12", 32 },
101 { ARMV7M_R13
, "sp", 32 },
102 { ARMV7M_R14
, "lr", 32 },
103 { ARMV7M_PC
, "pc", 32 },
105 { ARMV7M_xPSR
, "xPSR", 32 },
106 { ARMV7M_MSP
, "msp", 32 },
107 { ARMV7M_PSP
, "psp", 32 },
109 { ARMV7M_PRIMASK
, "primask", 1 },
110 { ARMV7M_BASEPRI
, "basepri", 8 },
111 { ARMV7M_FAULTMASK
, "faultmask", 1 },
112 { ARMV7M_CONTROL
, "control", 2 },
115 #define ARMV7M_NUM_REGS ARRAY_SIZE(armv7m_regs)
118 * Restores target context using the cache of core registers set up
119 * by armv7m_build_reg_cache(), calling optional core-specific hooks.
121 int armv7m_restore_context(struct target
*target
)
124 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
125 struct reg_cache
*cache
= armv7m
->arm
.core_cache
;
129 if (armv7m
->pre_restore_context
)
130 armv7m
->pre_restore_context(target
);
132 for (i
= ARMV7M_NUM_REGS
- 1; i
>= 0; i
--) {
133 if (cache
->reg_list
[i
].dirty
) {
134 uint32_t value
= buf_get_u32(cache
->reg_list
[i
].value
, 0, 32);
135 armv7m
->arm
.write_core_reg(target
, &cache
->reg_list
[i
], i
, ARM_MODE_ANY
, value
);
142 /* Core state functions */
145 * Maps ISR number (from xPSR) to name.
146 * Note that while names and meanings for the first sixteen are standardized
147 * (with zero not a true exception), external interrupts are only numbered.
148 * They are assigned by vendors, which generally assign different numbers to
149 * peripherals (such as UART0 or a USB peripheral controller).
151 char *armv7m_exception_string(int number
)
153 static char enamebuf
[32];
155 if ((number
< 0) | (number
> 511))
156 return "Invalid exception";
158 return armv7m_exception_strings
[number
];
159 sprintf(enamebuf
, "External Interrupt(%i)", number
- 16);
163 static int armv7m_get_core_reg(struct reg
*reg
)
166 struct arm_reg
*armv7m_reg
= reg
->arch_info
;
167 struct target
*target
= armv7m_reg
->target
;
168 struct arm
*arm
= target_to_arm(target
);
170 if (target
->state
!= TARGET_HALTED
)
171 return ERROR_TARGET_NOT_HALTED
;
173 retval
= arm
->read_core_reg(target
, reg
, armv7m_reg
->num
, arm
->core_mode
);
178 static int armv7m_set_core_reg(struct reg
*reg
, uint8_t *buf
)
180 struct arm_reg
*armv7m_reg
= reg
->arch_info
;
181 struct target
*target
= armv7m_reg
->target
;
182 uint32_t value
= buf_get_u32(buf
, 0, 32);
184 if (target
->state
!= TARGET_HALTED
)
185 return ERROR_TARGET_NOT_HALTED
;
187 buf_set_u32(reg
->value
, 0, 32, value
);
194 static int armv7m_read_core_reg(struct target
*target
, struct reg
*r
,
195 int num
, enum arm_mode mode
)
199 struct arm_reg
*armv7m_core_reg
;
200 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
202 assert(num
< (int)armv7m
->arm
.core_cache
->num_regs
);
204 armv7m_core_reg
= armv7m
->arm
.core_cache
->reg_list
[num
].arch_info
;
205 retval
= armv7m
->load_core_reg_u32(target
,
206 armv7m_core_reg
->num
, ®_value
);
208 buf_set_u32(armv7m
->arm
.core_cache
->reg_list
[num
].value
, 0, 32, reg_value
);
209 armv7m
->arm
.core_cache
->reg_list
[num
].valid
= 1;
210 armv7m
->arm
.core_cache
->reg_list
[num
].dirty
= 0;
215 static int armv7m_write_core_reg(struct target
*target
, struct reg
*r
,
216 int num
, enum arm_mode mode
, uint32_t value
)
220 struct arm_reg
*armv7m_core_reg
;
221 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
223 assert(num
< (int)armv7m
->arm
.core_cache
->num_regs
);
225 reg_value
= buf_get_u32(armv7m
->arm
.core_cache
->reg_list
[num
].value
, 0, 32);
226 armv7m_core_reg
= armv7m
->arm
.core_cache
->reg_list
[num
].arch_info
;
227 retval
= armv7m
->store_core_reg_u32(target
,
228 armv7m_core_reg
->num
,
230 if (retval
!= ERROR_OK
) {
231 LOG_ERROR("JTAG failure");
232 armv7m
->arm
.core_cache
->reg_list
[num
].dirty
= armv7m
->arm
.core_cache
->reg_list
[num
].valid
;
233 return ERROR_JTAG_DEVICE_ERROR
;
236 LOG_DEBUG("write core reg %i value 0x%" PRIx32
"", num
, reg_value
);
237 armv7m
->arm
.core_cache
->reg_list
[num
].valid
= 1;
238 armv7m
->arm
.core_cache
->reg_list
[num
].dirty
= 0;
244 * Returns generic ARM userspace registers to GDB.
245 * GDB doesn't quite understand that most ARMs don't have floating point
246 * hardware, so this also fakes a set of long-obsolete FPA registers that
247 * are not used in EABI based software stacks.
249 int armv7m_get_gdb_reg_list(struct target
*target
, struct reg
**reg_list
[],
250 int *reg_list_size
, enum target_register_class reg_class
)
252 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
256 *reg_list
= malloc(sizeof(struct reg
*) * (*reg_list_size
));
259 * GDB register packet format for ARM:
260 * - the first 16 registers are r0..r15
261 * - (obsolete) 8 FPA registers
262 * - (obsolete) FPA status
265 for (i
= 0; i
< 16; i
++)
266 (*reg_list
)[i
] = &armv7m
->arm
.core_cache
->reg_list
[i
];
268 for (i
= 16; i
< 24; i
++)
269 (*reg_list
)[i
] = &arm_gdb_dummy_fp_reg
;
270 (*reg_list
)[24] = &arm_gdb_dummy_fps_reg
;
271 (*reg_list
)[25] = &armv7m
->arm
.core_cache
->reg_list
[ARMV7M_xPSR
];
276 /** Runs a Thumb algorithm in the target. */
277 int armv7m_run_algorithm(struct target
*target
,
278 int num_mem_params
, struct mem_param
*mem_params
,
279 int num_reg_params
, struct reg_param
*reg_params
,
280 uint32_t entry_point
, uint32_t exit_point
,
281 int timeout_ms
, void *arch_info
)
285 retval
= armv7m_start_algorithm(target
,
286 num_mem_params
, mem_params
,
287 num_reg_params
, reg_params
,
288 entry_point
, exit_point
,
291 if (retval
== ERROR_OK
)
292 retval
= armv7m_wait_algorithm(target
,
293 num_mem_params
, mem_params
,
294 num_reg_params
, reg_params
,
295 exit_point
, timeout_ms
,
301 /** Starts a Thumb algorithm in the target. */
302 int armv7m_start_algorithm(struct target
*target
,
303 int num_mem_params
, struct mem_param
*mem_params
,
304 int num_reg_params
, struct reg_param
*reg_params
,
305 uint32_t entry_point
, uint32_t exit_point
,
308 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
309 struct armv7m_algorithm
*armv7m_algorithm_info
= arch_info
;
310 enum arm_mode core_mode
= armv7m
->arm
.core_mode
;
311 int retval
= ERROR_OK
;
313 /* NOTE: armv7m_run_algorithm requires that each algorithm uses a software breakpoint
314 * at the exit point */
316 if (armv7m_algorithm_info
->common_magic
!= ARMV7M_COMMON_MAGIC
) {
317 LOG_ERROR("current target isn't an ARMV7M target");
318 return ERROR_TARGET_INVALID
;
321 if (target
->state
!= TARGET_HALTED
) {
322 LOG_WARNING("target not halted");
323 return ERROR_TARGET_NOT_HALTED
;
326 /* refresh core register cache
327 * Not needed if core register cache is always consistent with target process state */
328 for (unsigned i
= 0; i
< ARMV7M_NUM_REGS
; i
++) {
330 armv7m_algorithm_info
->context
[i
] = buf_get_u32(
331 armv7m
->arm
.core_cache
->reg_list
[i
].value
,
336 for (int i
= 0; i
< num_mem_params
; i
++) {
337 /* TODO: Write only out params */
338 retval
= target_write_buffer(target
, mem_params
[i
].address
,
340 mem_params
[i
].value
);
341 if (retval
!= ERROR_OK
)
345 for (int i
= 0; i
< num_reg_params
; i
++) {
347 register_get_by_name(armv7m
->arm
.core_cache
, reg_params
[i
].reg_name
, 0);
348 /* uint32_t regvalue; */
351 LOG_ERROR("BUG: register '%s' not found", reg_params
[i
].reg_name
);
352 return ERROR_COMMAND_SYNTAX_ERROR
;
355 if (reg
->size
!= reg_params
[i
].size
) {
356 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
357 reg_params
[i
].reg_name
);
358 return ERROR_COMMAND_SYNTAX_ERROR
;
361 /* regvalue = buf_get_u32(reg_params[i].value, 0, 32); */
362 armv7m_set_core_reg(reg
, reg_params
[i
].value
);
365 if (armv7m_algorithm_info
->core_mode
!= ARM_MODE_ANY
&&
366 armv7m_algorithm_info
->core_mode
!= core_mode
) {
368 /* we cannot set ARM_MODE_HANDLER, so use ARM_MODE_THREAD instead */
369 if (armv7m_algorithm_info
->core_mode
== ARM_MODE_HANDLER
) {
370 armv7m_algorithm_info
->core_mode
= ARM_MODE_THREAD
;
371 LOG_INFO("ARM_MODE_HANDLER not currently supported, using ARM_MODE_THREAD instead");
374 LOG_DEBUG("setting core_mode: 0x%2.2x", armv7m_algorithm_info
->core_mode
);
375 buf_set_u32(armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].value
,
376 0, 1, armv7m_algorithm_info
->core_mode
);
377 armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].dirty
= 1;
378 armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].valid
= 1;
381 /* save previous core mode */
382 armv7m_algorithm_info
->core_mode
= core_mode
;
384 retval
= target_resume(target
, 0, entry_point
, 1, 1);
389 /** Waits for an algorithm in the target. */
390 int armv7m_wait_algorithm(struct target
*target
,
391 int num_mem_params
, struct mem_param
*mem_params
,
392 int num_reg_params
, struct reg_param
*reg_params
,
393 uint32_t exit_point
, int timeout_ms
,
396 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
397 struct armv7m_algorithm
*armv7m_algorithm_info
= arch_info
;
398 int retval
= ERROR_OK
;
401 /* NOTE: armv7m_run_algorithm requires that each algorithm uses a software breakpoint
402 * at the exit point */
404 if (armv7m_algorithm_info
->common_magic
!= ARMV7M_COMMON_MAGIC
) {
405 LOG_ERROR("current target isn't an ARMV7M target");
406 return ERROR_TARGET_INVALID
;
409 retval
= target_wait_state(target
, TARGET_HALTED
, timeout_ms
);
410 /* If the target fails to halt due to the breakpoint, force a halt */
411 if (retval
!= ERROR_OK
|| target
->state
!= TARGET_HALTED
) {
412 retval
= target_halt(target
);
413 if (retval
!= ERROR_OK
)
415 retval
= target_wait_state(target
, TARGET_HALTED
, 500);
416 if (retval
!= ERROR_OK
)
418 return ERROR_TARGET_TIMEOUT
;
421 armv7m
->load_core_reg_u32(target
, 15, &pc
);
422 if (exit_point
&& (pc
!= exit_point
)) {
423 LOG_DEBUG("failed algorithm halted at 0x%" PRIx32
", expected 0x%" PRIx32
,
426 return ERROR_TARGET_TIMEOUT
;
429 /* Read memory values to mem_params[] */
430 for (int i
= 0; i
< num_mem_params
; i
++) {
431 if (mem_params
[i
].direction
!= PARAM_OUT
) {
432 retval
= target_read_buffer(target
, mem_params
[i
].address
,
434 mem_params
[i
].value
);
435 if (retval
!= ERROR_OK
)
440 /* Copy core register values to reg_params[] */
441 for (int i
= 0; i
< num_reg_params
; i
++) {
442 if (reg_params
[i
].direction
!= PARAM_OUT
) {
443 struct reg
*reg
= register_get_by_name(armv7m
->arm
.core_cache
,
444 reg_params
[i
].reg_name
,
448 LOG_ERROR("BUG: register '%s' not found", reg_params
[i
].reg_name
);
449 return ERROR_COMMAND_SYNTAX_ERROR
;
452 if (reg
->size
!= reg_params
[i
].size
) {
454 "BUG: register '%s' size doesn't match reg_params[i].size",
455 reg_params
[i
].reg_name
);
456 return ERROR_COMMAND_SYNTAX_ERROR
;
459 buf_set_u32(reg_params
[i
].value
, 0, 32, buf_get_u32(reg
->value
, 0, 32));
463 for (int i
= ARMV7M_NUM_REGS
- 1; i
>= 0; i
--) {
465 regvalue
= buf_get_u32(armv7m
->arm
.core_cache
->reg_list
[i
].value
, 0, 32);
466 if (regvalue
!= armv7m_algorithm_info
->context
[i
]) {
467 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32
,
468 armv7m
->arm
.core_cache
->reg_list
[i
].name
,
469 armv7m_algorithm_info
->context
[i
]);
470 buf_set_u32(armv7m
->arm
.core_cache
->reg_list
[i
].value
,
471 0, 32, armv7m_algorithm_info
->context
[i
]);
472 armv7m
->arm
.core_cache
->reg_list
[i
].valid
= 1;
473 armv7m
->arm
.core_cache
->reg_list
[i
].dirty
= 1;
477 /* restore previous core mode */
478 if (armv7m_algorithm_info
->core_mode
!= armv7m
->arm
.core_mode
) {
479 LOG_DEBUG("restoring core_mode: 0x%2.2x", armv7m_algorithm_info
->core_mode
);
480 buf_set_u32(armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].value
,
481 0, 1, armv7m_algorithm_info
->core_mode
);
482 armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].dirty
= 1;
483 armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].valid
= 1;
486 armv7m
->arm
.core_mode
= armv7m_algorithm_info
->core_mode
;
491 /** Logs summary of ARMv7-M state for a halted target. */
492 int armv7m_arch_state(struct target
*target
)
494 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
495 struct arm
*arm
= &armv7m
->arm
;
498 ctrl
= buf_get_u32(arm
->core_cache
->reg_list
[ARMV7M_CONTROL
].value
, 0, 32);
499 sp
= buf_get_u32(arm
->core_cache
->reg_list
[ARMV7M_R13
].value
, 0, 32);
501 LOG_USER("target halted due to %s, current mode: %s %s\n"
502 "xPSR: %#8.8" PRIx32
" pc: %#8.8" PRIx32
" %csp: %#8.8" PRIx32
"%s",
503 debug_reason_name(target
),
504 arm_mode_name(arm
->core_mode
),
505 armv7m_exception_string(armv7m
->exception_number
),
506 buf_get_u32(arm
->cpsr
->value
, 0, 32),
507 buf_get_u32(arm
->pc
->value
, 0, 32),
508 (ctrl
& 0x02) ? 'p' : 'm',
510 arm
->is_semihosting
? ", semihosting" : "");
515 static const struct reg_arch_type armv7m_reg_type
= {
516 .get
= armv7m_get_core_reg
,
517 .set
= armv7m_set_core_reg
,
520 /** Builds cache of architecturally defined registers. */
521 struct reg_cache
*armv7m_build_reg_cache(struct target
*target
)
523 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
524 struct arm
*arm
= &armv7m
->arm
;
525 int num_regs
= ARMV7M_NUM_REGS
;
526 struct reg_cache
**cache_p
= register_get_last_cache_p(&target
->reg_cache
);
527 struct reg_cache
*cache
= malloc(sizeof(struct reg_cache
));
528 struct reg
*reg_list
= calloc(num_regs
, sizeof(struct reg
));
529 struct arm_reg
*arch_info
= calloc(num_regs
, sizeof(struct arm_reg
));
532 /* Build the process context cache */
533 cache
->name
= "arm v7m registers";
535 cache
->reg_list
= reg_list
;
536 cache
->num_regs
= num_regs
;
539 for (i
= 0; i
< num_regs
; i
++) {
540 arch_info
[i
].num
= armv7m_regs
[i
].id
;
541 arch_info
[i
].target
= target
;
542 arch_info
[i
].arm
= arm
;
544 reg_list
[i
].name
= armv7m_regs
[i
].name
;
545 reg_list
[i
].size
= armv7m_regs
[i
].bits
;
546 reg_list
[i
].value
= calloc(1, 4);
547 reg_list
[i
].dirty
= 0;
548 reg_list
[i
].valid
= 0;
549 reg_list
[i
].type
= &armv7m_reg_type
;
550 reg_list
[i
].arch_info
= &arch_info
[i
];
553 arm
->cpsr
= reg_list
+ ARMV7M_xPSR
;
554 arm
->pc
= reg_list
+ ARMV7M_PC
;
555 arm
->core_cache
= cache
;
559 static int armv7m_setup_semihosting(struct target
*target
, int enable
)
561 /* nothing todo for armv7m */
565 /** Sets up target as a generic ARMv7-M core */
566 int armv7m_init_arch_info(struct target
*target
, struct armv7m_common
*armv7m
)
568 struct arm
*arm
= &armv7m
->arm
;
570 armv7m
->common_magic
= ARMV7M_COMMON_MAGIC
;
571 armv7m
->fp_feature
= FP_NONE
;
573 arm
->core_type
= ARM_MODE_THREAD
;
574 arm
->arch_info
= armv7m
;
575 arm
->setup_semihosting
= armv7m_setup_semihosting
;
577 arm
->read_core_reg
= armv7m_read_core_reg
;
578 arm
->write_core_reg
= armv7m_write_core_reg
;
580 return arm_init_arch_info(target
, arm
);
583 /** Generates a CRC32 checksum of a memory region. */
584 int armv7m_checksum_memory(struct target
*target
,
585 uint32_t address
, uint32_t count
, uint32_t *checksum
)
587 struct working_area
*crc_algorithm
;
588 struct armv7m_algorithm armv7m_info
;
589 struct reg_param reg_params
[2];
592 /* see contrib/loaders/checksum/armv7m_crc.s for src */
594 static const uint8_t cortex_m3_crc_code
[] = {
596 0x02, 0x46, /* mov r2, r0 */
597 0x00, 0x20, /* movs r0, #0 */
598 0xC0, 0x43, /* mvns r0, r0 */
599 0x0A, 0x4E, /* ldr r6, CRC32XOR */
600 0x0B, 0x46, /* mov r3, r1 */
601 0x00, 0x24, /* movs r4, #0 */
602 0x0D, 0xE0, /* b ncomp */
604 0x11, 0x5D, /* ldrb r1, [r2, r4] */
605 0x09, 0x06, /* lsls r1, r1, #24 */
606 0x48, 0x40, /* eors r0, r0, r1 */
607 0x00, 0x25, /* movs r5, #0 */
609 0x00, 0x28, /* cmp r0, #0 */
610 0x02, 0xDA, /* bge notset */
611 0x40, 0x00, /* lsls r0, r0, #1 */
612 0x70, 0x40, /* eors r0, r0, r6 */
613 0x00, 0xE0, /* b cont */
615 0x40, 0x00, /* lsls r0, r0, #1 */
617 0x01, 0x35, /* adds r5, r5, #1 */
618 0x08, 0x2D, /* cmp r5, #8 */
619 0xF6, 0xD1, /* bne loop */
620 0x01, 0x34, /* adds r4, r4, #1 */
622 0x9C, 0x42, /* cmp r4, r3 */
623 0xEF, 0xD1, /* bne nbyte */
624 0x00, 0xBE, /* bkpt #0 */
625 0xB7, 0x1D, 0xC1, 0x04 /* CRC32XOR: .word 0x04c11db7 */
628 retval
= target_alloc_working_area(target
, sizeof(cortex_m3_crc_code
), &crc_algorithm
);
629 if (retval
!= ERROR_OK
)
632 retval
= target_write_buffer(target
, crc_algorithm
->address
,
633 sizeof(cortex_m3_crc_code
), (uint8_t *)cortex_m3_crc_code
);
634 if (retval
!= ERROR_OK
)
637 armv7m_info
.common_magic
= ARMV7M_COMMON_MAGIC
;
638 armv7m_info
.core_mode
= ARM_MODE_THREAD
;
640 init_reg_param(®_params
[0], "r0", 32, PARAM_IN_OUT
);
641 init_reg_param(®_params
[1], "r1", 32, PARAM_OUT
);
643 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
644 buf_set_u32(reg_params
[1].value
, 0, 32, count
);
646 int timeout
= 20000 * (1 + (count
/ (1024 * 1024)));
648 retval
= target_run_algorithm(target
, 0, NULL
, 2, reg_params
, crc_algorithm
->address
,
649 crc_algorithm
->address
+ (sizeof(cortex_m3_crc_code
) - 6),
650 timeout
, &armv7m_info
);
652 if (retval
== ERROR_OK
)
653 *checksum
= buf_get_u32(reg_params
[0].value
, 0, 32);
655 LOG_ERROR("error executing cortex_m crc algorithm");
657 destroy_reg_param(®_params
[0]);
658 destroy_reg_param(®_params
[1]);
661 target_free_working_area(target
, crc_algorithm
);
666 /** Checks whether a memory region is zeroed. */
667 int armv7m_blank_check_memory(struct target
*target
,
668 uint32_t address
, uint32_t count
, uint32_t *blank
)
670 struct working_area
*erase_check_algorithm
;
671 struct reg_param reg_params
[3];
672 struct armv7m_algorithm armv7m_info
;
675 /* see contrib/loaders/erase_check/armv7m_erase_check.s for src */
677 static const uint8_t erase_check_code
[] = {
679 0x03, 0x78, /* ldrb r3, [r0] */
680 0x01, 0x30, /* adds r0, #1 */
681 0x1A, 0x40, /* ands r2, r2, r3 */
682 0x01, 0x39, /* subs r1, r1, #1 */
683 0xFA, 0xD1, /* bne loop */
684 0x00, 0xBE /* bkpt #0 */
687 /* make sure we have a working area */
688 if (target_alloc_working_area(target
, sizeof(erase_check_code
),
689 &erase_check_algorithm
) != ERROR_OK
)
690 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
692 retval
= target_write_buffer(target
, erase_check_algorithm
->address
,
693 sizeof(erase_check_code
), (uint8_t *)erase_check_code
);
694 if (retval
!= ERROR_OK
)
697 armv7m_info
.common_magic
= ARMV7M_COMMON_MAGIC
;
698 armv7m_info
.core_mode
= ARM_MODE_THREAD
;
700 init_reg_param(®_params
[0], "r0", 32, PARAM_OUT
);
701 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
703 init_reg_param(®_params
[1], "r1", 32, PARAM_OUT
);
704 buf_set_u32(reg_params
[1].value
, 0, 32, count
);
706 init_reg_param(®_params
[2], "r2", 32, PARAM_IN_OUT
);
707 buf_set_u32(reg_params
[2].value
, 0, 32, 0xff);
709 retval
= target_run_algorithm(target
,
714 erase_check_algorithm
->address
,
715 erase_check_algorithm
->address
+ (sizeof(erase_check_code
) - 2),
719 if (retval
== ERROR_OK
)
720 *blank
= buf_get_u32(reg_params
[2].value
, 0, 32);
722 destroy_reg_param(®_params
[0]);
723 destroy_reg_param(®_params
[1]);
724 destroy_reg_param(®_params
[2]);
726 target_free_working_area(target
, erase_check_algorithm
);
731 int armv7m_maybe_skip_bkpt_inst(struct target
*target
, bool *inst_found
)
733 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
734 struct reg
*r
= armv7m
->arm
.pc
;
738 /* if we halted last time due to a bkpt instruction
739 * then we have to manually step over it, otherwise
740 * the core will break again */
742 if (target
->debug_reason
== DBG_REASON_BREAKPOINT
) {
744 uint32_t pc
= buf_get_u32(r
->value
, 0, 32);
747 if (target_read_u16(target
, pc
, &op
) == ERROR_OK
) {
748 if ((op
& 0xFF00) == 0xBE00) {
749 pc
= buf_get_u32(r
->value
, 0, 32) + 2;
750 buf_set_u32(r
->value
, 0, 32, pc
);
754 LOG_DEBUG("Skipping over BKPT instruction");
760 *inst_found
= result
;
765 const struct command_registration armv7m_command_handlers
[] = {
767 .chain
= arm_command_handlers
,
770 .chain
= dap_command_handlers
,
772 COMMAND_REGISTRATION_DONE
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