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
,
72 #ifdef ARMV7_GDB_HACKS
73 uint8_t armv7m_gdb_dummy_cpsr_value
[] = {0, 0, 0, 0};
75 struct reg armv7m_gdb_dummy_cpsr_reg
= {
76 .name
= "GDB dummy cpsr register",
77 .value
= armv7m_gdb_dummy_cpsr_value
,
86 * These registers are not memory-mapped. The ARMv7-M profile includes
87 * memory mapped registers too, such as for the NVIC (interrupt controller)
88 * and SysTick (timer) modules; those can mostly be treated as peripherals.
90 * The ARMv6-M profile is almost identical in this respect, except that it
91 * doesn't include basepri or faultmask registers.
98 { ARMV7M_R0
, "r0", 32 },
99 { ARMV7M_R1
, "r1", 32 },
100 { ARMV7M_R2
, "r2", 32 },
101 { ARMV7M_R3
, "r3", 32 },
103 { ARMV7M_R4
, "r4", 32 },
104 { ARMV7M_R5
, "r5", 32 },
105 { ARMV7M_R6
, "r6", 32 },
106 { ARMV7M_R7
, "r7", 32 },
108 { ARMV7M_R8
, "r8", 32 },
109 { ARMV7M_R9
, "r9", 32 },
110 { ARMV7M_R10
, "r10", 32 },
111 { ARMV7M_R11
, "r11", 32 },
113 { ARMV7M_R12
, "r12", 32 },
114 { ARMV7M_R13
, "sp", 32 },
115 { ARMV7M_R14
, "lr", 32 },
116 { ARMV7M_PC
, "pc", 32 },
118 { ARMV7M_xPSR
, "xPSR", 32 },
119 { ARMV7M_MSP
, "msp", 32 },
120 { ARMV7M_PSP
, "psp", 32 },
122 { ARMV7M_PRIMASK
, "primask", 1 },
123 { ARMV7M_BASEPRI
, "basepri", 8 },
124 { ARMV7M_FAULTMASK
, "faultmask", 1 },
125 { ARMV7M_CONTROL
, "control", 2 },
128 #define ARMV7M_NUM_REGS ARRAY_SIZE(armv7m_regs)
131 * Restores target context using the cache of core registers set up
132 * by armv7m_build_reg_cache(), calling optional core-specific hooks.
134 int armv7m_restore_context(struct target
*target
)
137 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
138 struct reg_cache
*cache
= armv7m
->arm
.core_cache
;
142 if (armv7m
->pre_restore_context
)
143 armv7m
->pre_restore_context(target
);
145 for (i
= ARMV7M_NUM_REGS
- 1; i
>= 0; i
--) {
146 if (cache
->reg_list
[i
].dirty
) {
147 uint32_t value
= buf_get_u32(cache
->reg_list
[i
].value
, 0, 32);
148 armv7m
->arm
.write_core_reg(target
, &cache
->reg_list
[i
], i
, ARM_MODE_ANY
, value
);
155 /* Core state functions */
158 * Maps ISR number (from xPSR) to name.
159 * Note that while names and meanings for the first sixteen are standardized
160 * (with zero not a true exception), external interrupts are only numbered.
161 * They are assigned by vendors, which generally assign different numbers to
162 * peripherals (such as UART0 or a USB peripheral controller).
164 char *armv7m_exception_string(int number
)
166 static char enamebuf
[32];
168 if ((number
< 0) | (number
> 511))
169 return "Invalid exception";
171 return armv7m_exception_strings
[number
];
172 sprintf(enamebuf
, "External Interrupt(%i)", number
- 16);
176 static int armv7m_get_core_reg(struct reg
*reg
)
179 struct arm_reg
*armv7m_reg
= reg
->arch_info
;
180 struct target
*target
= armv7m_reg
->target
;
181 struct arm
*arm
= target_to_arm(target
);
183 if (target
->state
!= TARGET_HALTED
)
184 return ERROR_TARGET_NOT_HALTED
;
186 retval
= arm
->read_core_reg(target
, reg
, armv7m_reg
->num
, arm
->core_mode
);
191 static int armv7m_set_core_reg(struct reg
*reg
, uint8_t *buf
)
193 struct arm_reg
*armv7m_reg
= reg
->arch_info
;
194 struct target
*target
= armv7m_reg
->target
;
195 uint32_t value
= buf_get_u32(buf
, 0, 32);
197 if (target
->state
!= TARGET_HALTED
)
198 return ERROR_TARGET_NOT_HALTED
;
200 buf_set_u32(reg
->value
, 0, 32, value
);
207 static int armv7m_read_core_reg(struct target
*target
, struct reg
*r
,
208 int num
, enum arm_mode mode
)
212 struct arm_reg
*armv7m_core_reg
;
213 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
215 assert(num
< (int)armv7m
->arm
.core_cache
->num_regs
);
217 armv7m_core_reg
= armv7m
->arm
.core_cache
->reg_list
[num
].arch_info
;
218 retval
= armv7m
->load_core_reg_u32(target
,
219 armv7m_core_reg
->num
, ®_value
);
221 buf_set_u32(armv7m
->arm
.core_cache
->reg_list
[num
].value
, 0, 32, reg_value
);
222 armv7m
->arm
.core_cache
->reg_list
[num
].valid
= 1;
223 armv7m
->arm
.core_cache
->reg_list
[num
].dirty
= 0;
228 static int armv7m_write_core_reg(struct target
*target
, struct reg
*r
,
229 int num
, enum arm_mode mode
, uint32_t value
)
233 struct arm_reg
*armv7m_core_reg
;
234 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
236 assert(num
< (int)armv7m
->arm
.core_cache
->num_regs
);
238 reg_value
= buf_get_u32(armv7m
->arm
.core_cache
->reg_list
[num
].value
, 0, 32);
239 armv7m_core_reg
= armv7m
->arm
.core_cache
->reg_list
[num
].arch_info
;
240 retval
= armv7m
->store_core_reg_u32(target
,
241 armv7m_core_reg
->num
,
243 if (retval
!= ERROR_OK
) {
244 LOG_ERROR("JTAG failure");
245 armv7m
->arm
.core_cache
->reg_list
[num
].dirty
= armv7m
->arm
.core_cache
->reg_list
[num
].valid
;
246 return ERROR_JTAG_DEVICE_ERROR
;
249 LOG_DEBUG("write core reg %i value 0x%" PRIx32
"", num
, reg_value
);
250 armv7m
->arm
.core_cache
->reg_list
[num
].valid
= 1;
251 armv7m
->arm
.core_cache
->reg_list
[num
].dirty
= 0;
257 * Returns generic ARM userspace registers to GDB.
258 * GDB doesn't quite understand that most ARMs don't have floating point
259 * hardware, so this also fakes a set of long-obsolete FPA registers that
260 * are not used in EABI based software stacks.
262 int armv7m_get_gdb_reg_list(struct target
*target
, struct reg
**reg_list
[],
263 int *reg_list_size
, enum target_register_class reg_class
)
265 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
269 *reg_list
= malloc(sizeof(struct reg
*) * (*reg_list_size
));
272 * GDB register packet format for ARM:
273 * - the first 16 registers are r0..r15
274 * - (obsolete) 8 FPA registers
275 * - (obsolete) FPA status
278 for (i
= 0; i
< 16; i
++)
279 (*reg_list
)[i
] = &armv7m
->arm
.core_cache
->reg_list
[i
];
281 for (i
= 16; i
< 24; i
++)
282 (*reg_list
)[i
] = &arm_gdb_dummy_fp_reg
;
283 (*reg_list
)[24] = &arm_gdb_dummy_fps_reg
;
285 #ifdef ARMV7_GDB_HACKS
286 /* use dummy cpsr reg otherwise gdb may try and set the thumb bit */
287 (*reg_list
)[25] = &armv7m_gdb_dummy_cpsr_reg
;
289 /* ARMV7M is always in thumb mode, try to make GDB understand this
290 * if it does not support this arch */
291 *((char *)armv7m
->arm
.pc
->value
) |= 1;
293 (*reg_list
)[25] = &armv7m
->arm
.core_cache
->reg_list
[ARMV7M_xPSR
];
299 /** Runs a Thumb algorithm in the target. */
300 int armv7m_run_algorithm(struct target
*target
,
301 int num_mem_params
, struct mem_param
*mem_params
,
302 int num_reg_params
, struct reg_param
*reg_params
,
303 uint32_t entry_point
, uint32_t exit_point
,
304 int timeout_ms
, void *arch_info
)
308 retval
= armv7m_start_algorithm(target
,
309 num_mem_params
, mem_params
,
310 num_reg_params
, reg_params
,
311 entry_point
, exit_point
,
314 if (retval
== ERROR_OK
)
315 retval
= armv7m_wait_algorithm(target
,
316 num_mem_params
, mem_params
,
317 num_reg_params
, reg_params
,
318 exit_point
, timeout_ms
,
324 /** Starts a Thumb algorithm in the target. */
325 int armv7m_start_algorithm(struct target
*target
,
326 int num_mem_params
, struct mem_param
*mem_params
,
327 int num_reg_params
, struct reg_param
*reg_params
,
328 uint32_t entry_point
, uint32_t exit_point
,
331 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
332 struct armv7m_algorithm
*armv7m_algorithm_info
= arch_info
;
333 enum arm_mode core_mode
= armv7m
->arm
.core_mode
;
334 int retval
= ERROR_OK
;
336 /* NOTE: armv7m_run_algorithm requires that each algorithm uses a software breakpoint
337 * at the exit point */
339 if (armv7m_algorithm_info
->common_magic
!= ARMV7M_COMMON_MAGIC
) {
340 LOG_ERROR("current target isn't an ARMV7M target");
341 return ERROR_TARGET_INVALID
;
344 if (target
->state
!= TARGET_HALTED
) {
345 LOG_WARNING("target not halted");
346 return ERROR_TARGET_NOT_HALTED
;
349 /* refresh core register cache
350 * Not needed if core register cache is always consistent with target process state */
351 for (unsigned i
= 0; i
< ARMV7M_NUM_REGS
; i
++) {
353 armv7m_algorithm_info
->context
[i
] = buf_get_u32(
354 armv7m
->arm
.core_cache
->reg_list
[i
].value
,
359 for (int i
= 0; i
< num_mem_params
; i
++) {
360 /* TODO: Write only out params */
361 retval
= target_write_buffer(target
, mem_params
[i
].address
,
363 mem_params
[i
].value
);
364 if (retval
!= ERROR_OK
)
368 for (int i
= 0; i
< num_reg_params
; i
++) {
370 register_get_by_name(armv7m
->arm
.core_cache
, reg_params
[i
].reg_name
, 0);
371 /* uint32_t regvalue; */
374 LOG_ERROR("BUG: register '%s' not found", reg_params
[i
].reg_name
);
375 return ERROR_COMMAND_SYNTAX_ERROR
;
378 if (reg
->size
!= reg_params
[i
].size
) {
379 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
380 reg_params
[i
].reg_name
);
381 return ERROR_COMMAND_SYNTAX_ERROR
;
384 /* regvalue = buf_get_u32(reg_params[i].value, 0, 32); */
385 armv7m_set_core_reg(reg
, reg_params
[i
].value
);
388 if (armv7m_algorithm_info
->core_mode
!= ARM_MODE_ANY
&&
389 armv7m_algorithm_info
->core_mode
!= core_mode
) {
391 /* we cannot set ARM_MODE_HANDLER, so use ARM_MODE_THREAD instead */
392 if (armv7m_algorithm_info
->core_mode
== ARM_MODE_HANDLER
) {
393 armv7m_algorithm_info
->core_mode
= ARM_MODE_THREAD
;
394 LOG_INFO("ARM_MODE_HANDLER not currently supported, using ARM_MODE_THREAD instead");
397 LOG_DEBUG("setting core_mode: 0x%2.2x", armv7m_algorithm_info
->core_mode
);
398 buf_set_u32(armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].value
,
399 0, 1, armv7m_algorithm_info
->core_mode
);
400 armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].dirty
= 1;
401 armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].valid
= 1;
404 /* save previous core mode */
405 armv7m_algorithm_info
->core_mode
= core_mode
;
407 retval
= target_resume(target
, 0, entry_point
, 1, 1);
412 /** Waits for an algorithm in the target. */
413 int armv7m_wait_algorithm(struct target
*target
,
414 int num_mem_params
, struct mem_param
*mem_params
,
415 int num_reg_params
, struct reg_param
*reg_params
,
416 uint32_t exit_point
, int timeout_ms
,
419 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
420 struct armv7m_algorithm
*armv7m_algorithm_info
= arch_info
;
421 int retval
= ERROR_OK
;
424 /* NOTE: armv7m_run_algorithm requires that each algorithm uses a software breakpoint
425 * at the exit point */
427 if (armv7m_algorithm_info
->common_magic
!= ARMV7M_COMMON_MAGIC
) {
428 LOG_ERROR("current target isn't an ARMV7M target");
429 return ERROR_TARGET_INVALID
;
432 retval
= target_wait_state(target
, TARGET_HALTED
, timeout_ms
);
433 /* If the target fails to halt due to the breakpoint, force a halt */
434 if (retval
!= ERROR_OK
|| target
->state
!= TARGET_HALTED
) {
435 retval
= target_halt(target
);
436 if (retval
!= ERROR_OK
)
438 retval
= target_wait_state(target
, TARGET_HALTED
, 500);
439 if (retval
!= ERROR_OK
)
441 return ERROR_TARGET_TIMEOUT
;
444 armv7m
->load_core_reg_u32(target
, 15, &pc
);
445 if (exit_point
&& (pc
!= exit_point
)) {
446 LOG_DEBUG("failed algorithm halted at 0x%" PRIx32
", expected 0x%" PRIx32
,
449 return ERROR_TARGET_TIMEOUT
;
452 /* Read memory values to mem_params[] */
453 for (int i
= 0; i
< num_mem_params
; i
++) {
454 if (mem_params
[i
].direction
!= PARAM_OUT
) {
455 retval
= target_read_buffer(target
, mem_params
[i
].address
,
457 mem_params
[i
].value
);
458 if (retval
!= ERROR_OK
)
463 /* Copy core register values to reg_params[] */
464 for (int i
= 0; i
< num_reg_params
; i
++) {
465 if (reg_params
[i
].direction
!= PARAM_OUT
) {
466 struct reg
*reg
= register_get_by_name(armv7m
->arm
.core_cache
,
467 reg_params
[i
].reg_name
,
471 LOG_ERROR("BUG: register '%s' not found", reg_params
[i
].reg_name
);
472 return ERROR_COMMAND_SYNTAX_ERROR
;
475 if (reg
->size
!= reg_params
[i
].size
) {
477 "BUG: register '%s' size doesn't match reg_params[i].size",
478 reg_params
[i
].reg_name
);
479 return ERROR_COMMAND_SYNTAX_ERROR
;
482 buf_set_u32(reg_params
[i
].value
, 0, 32, buf_get_u32(reg
->value
, 0, 32));
486 for (int i
= ARMV7M_NUM_REGS
- 1; i
>= 0; i
--) {
488 regvalue
= buf_get_u32(armv7m
->arm
.core_cache
->reg_list
[i
].value
, 0, 32);
489 if (regvalue
!= armv7m_algorithm_info
->context
[i
]) {
490 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32
,
491 armv7m
->arm
.core_cache
->reg_list
[i
].name
,
492 armv7m_algorithm_info
->context
[i
]);
493 buf_set_u32(armv7m
->arm
.core_cache
->reg_list
[i
].value
,
494 0, 32, armv7m_algorithm_info
->context
[i
]);
495 armv7m
->arm
.core_cache
->reg_list
[i
].valid
= 1;
496 armv7m
->arm
.core_cache
->reg_list
[i
].dirty
= 1;
500 /* restore previous core mode */
501 if (armv7m_algorithm_info
->core_mode
!= armv7m
->arm
.core_mode
) {
502 LOG_DEBUG("restoring core_mode: 0x%2.2x", armv7m_algorithm_info
->core_mode
);
503 buf_set_u32(armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].value
,
504 0, 1, armv7m_algorithm_info
->core_mode
);
505 armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].dirty
= 1;
506 armv7m
->arm
.core_cache
->reg_list
[ARMV7M_CONTROL
].valid
= 1;
509 armv7m
->arm
.core_mode
= armv7m_algorithm_info
->core_mode
;
514 /** Logs summary of ARMv7-M state for a halted target. */
515 int armv7m_arch_state(struct target
*target
)
517 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
518 struct arm
*arm
= &armv7m
->arm
;
521 ctrl
= buf_get_u32(arm
->core_cache
->reg_list
[ARMV7M_CONTROL
].value
, 0, 32);
522 sp
= buf_get_u32(arm
->core_cache
->reg_list
[ARMV7M_R13
].value
, 0, 32);
524 LOG_USER("target halted due to %s, current mode: %s %s\n"
525 "xPSR: %#8.8" PRIx32
" pc: %#8.8" PRIx32
" %csp: %#8.8" PRIx32
"%s",
526 debug_reason_name(target
),
527 arm_mode_name(arm
->core_mode
),
528 armv7m_exception_string(armv7m
->exception_number
),
529 buf_get_u32(arm
->cpsr
->value
, 0, 32),
530 buf_get_u32(arm
->pc
->value
, 0, 32),
531 (ctrl
& 0x02) ? 'p' : 'm',
533 arm
->is_semihosting
? ", semihosting" : "");
538 static const struct reg_arch_type armv7m_reg_type
= {
539 .get
= armv7m_get_core_reg
,
540 .set
= armv7m_set_core_reg
,
543 /** Builds cache of architecturally defined registers. */
544 struct reg_cache
*armv7m_build_reg_cache(struct target
*target
)
546 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
547 struct arm
*arm
= &armv7m
->arm
;
548 int num_regs
= ARMV7M_NUM_REGS
;
549 struct reg_cache
**cache_p
= register_get_last_cache_p(&target
->reg_cache
);
550 struct reg_cache
*cache
= malloc(sizeof(struct reg_cache
));
551 struct reg
*reg_list
= calloc(num_regs
, sizeof(struct reg
));
552 struct arm_reg
*arch_info
= calloc(num_regs
, sizeof(struct arm_reg
));
555 #ifdef ARMV7_GDB_HACKS
556 register_init_dummy(&armv7m_gdb_dummy_cpsr_reg
);
559 /* Build the process context cache */
560 cache
->name
= "arm v7m registers";
562 cache
->reg_list
= reg_list
;
563 cache
->num_regs
= num_regs
;
566 for (i
= 0; i
< num_regs
; i
++) {
567 arch_info
[i
].num
= armv7m_regs
[i
].id
;
568 arch_info
[i
].target
= target
;
569 arch_info
[i
].arm
= arm
;
571 reg_list
[i
].name
= armv7m_regs
[i
].name
;
572 reg_list
[i
].size
= armv7m_regs
[i
].bits
;
573 reg_list
[i
].value
= calloc(1, 4);
574 reg_list
[i
].dirty
= 0;
575 reg_list
[i
].valid
= 0;
576 reg_list
[i
].type
= &armv7m_reg_type
;
577 reg_list
[i
].arch_info
= &arch_info
[i
];
580 arm
->cpsr
= reg_list
+ ARMV7M_xPSR
;
581 arm
->pc
= reg_list
+ ARMV7M_PC
;
582 arm
->core_cache
= cache
;
586 static int armv7m_setup_semihosting(struct target
*target
, int enable
)
588 /* nothing todo for armv7m */
592 /** Sets up target as a generic ARMv7-M core */
593 int armv7m_init_arch_info(struct target
*target
, struct armv7m_common
*armv7m
)
595 struct arm
*arm
= &armv7m
->arm
;
597 armv7m
->common_magic
= ARMV7M_COMMON_MAGIC
;
598 armv7m
->fp_feature
= FP_NONE
;
600 arm
->core_type
= ARM_MODE_THREAD
;
601 arm
->arch_info
= armv7m
;
602 arm
->setup_semihosting
= armv7m_setup_semihosting
;
604 arm
->read_core_reg
= armv7m_read_core_reg
;
605 arm
->write_core_reg
= armv7m_write_core_reg
;
607 return arm_init_arch_info(target
, arm
);
610 /** Generates a CRC32 checksum of a memory region. */
611 int armv7m_checksum_memory(struct target
*target
,
612 uint32_t address
, uint32_t count
, uint32_t *checksum
)
614 struct working_area
*crc_algorithm
;
615 struct armv7m_algorithm armv7m_info
;
616 struct reg_param reg_params
[2];
619 /* see contrib/loaders/checksum/armv7m_crc.s for src */
621 static const uint8_t cortex_m3_crc_code
[] = {
623 0x02, 0x46, /* mov r2, r0 */
624 0x00, 0x20, /* movs r0, #0 */
625 0xC0, 0x43, /* mvns r0, r0 */
626 0x0A, 0x4E, /* ldr r6, CRC32XOR */
627 0x0B, 0x46, /* mov r3, r1 */
628 0x00, 0x24, /* movs r4, #0 */
629 0x0D, 0xE0, /* b ncomp */
631 0x11, 0x5D, /* ldrb r1, [r2, r4] */
632 0x09, 0x06, /* lsls r1, r1, #24 */
633 0x48, 0x40, /* eors r0, r0, r1 */
634 0x00, 0x25, /* movs r5, #0 */
636 0x00, 0x28, /* cmp r0, #0 */
637 0x02, 0xDA, /* bge notset */
638 0x40, 0x00, /* lsls r0, r0, #1 */
639 0x70, 0x40, /* eors r0, r0, r6 */
640 0x00, 0xE0, /* b cont */
642 0x40, 0x00, /* lsls r0, r0, #1 */
644 0x01, 0x35, /* adds r5, r5, #1 */
645 0x08, 0x2D, /* cmp r5, #8 */
646 0xF6, 0xD1, /* bne loop */
647 0x01, 0x34, /* adds r4, r4, #1 */
649 0x9C, 0x42, /* cmp r4, r3 */
650 0xEF, 0xD1, /* bne nbyte */
651 0x00, 0xBE, /* bkpt #0 */
652 0xB7, 0x1D, 0xC1, 0x04 /* CRC32XOR: .word 0x04c11db7 */
655 retval
= target_alloc_working_area(target
, sizeof(cortex_m3_crc_code
), &crc_algorithm
);
656 if (retval
!= ERROR_OK
)
659 retval
= target_write_buffer(target
, crc_algorithm
->address
,
660 sizeof(cortex_m3_crc_code
), (uint8_t *)cortex_m3_crc_code
);
661 if (retval
!= ERROR_OK
)
664 armv7m_info
.common_magic
= ARMV7M_COMMON_MAGIC
;
665 armv7m_info
.core_mode
= ARM_MODE_THREAD
;
667 init_reg_param(®_params
[0], "r0", 32, PARAM_IN_OUT
);
668 init_reg_param(®_params
[1], "r1", 32, PARAM_OUT
);
670 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
671 buf_set_u32(reg_params
[1].value
, 0, 32, count
);
673 int timeout
= 20000 * (1 + (count
/ (1024 * 1024)));
675 retval
= target_run_algorithm(target
, 0, NULL
, 2, reg_params
, crc_algorithm
->address
,
676 crc_algorithm
->address
+ (sizeof(cortex_m3_crc_code
) - 6),
677 timeout
, &armv7m_info
);
679 if (retval
== ERROR_OK
)
680 *checksum
= buf_get_u32(reg_params
[0].value
, 0, 32);
682 LOG_ERROR("error executing cortex_m crc algorithm");
684 destroy_reg_param(®_params
[0]);
685 destroy_reg_param(®_params
[1]);
688 target_free_working_area(target
, crc_algorithm
);
693 /** Checks whether a memory region is zeroed. */
694 int armv7m_blank_check_memory(struct target
*target
,
695 uint32_t address
, uint32_t count
, uint32_t *blank
)
697 struct working_area
*erase_check_algorithm
;
698 struct reg_param reg_params
[3];
699 struct armv7m_algorithm armv7m_info
;
702 /* see contrib/loaders/erase_check/armv7m_erase_check.s for src */
704 static const uint8_t erase_check_code
[] = {
706 0x03, 0x78, /* ldrb r3, [r0] */
707 0x01, 0x30, /* adds r0, #1 */
708 0x1A, 0x40, /* ands r2, r2, r3 */
709 0x01, 0x39, /* subs r1, r1, #1 */
710 0xFA, 0xD1, /* bne loop */
711 0x00, 0xBE /* bkpt #0 */
714 /* make sure we have a working area */
715 if (target_alloc_working_area(target
, sizeof(erase_check_code
),
716 &erase_check_algorithm
) != ERROR_OK
)
717 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
719 retval
= target_write_buffer(target
, erase_check_algorithm
->address
,
720 sizeof(erase_check_code
), (uint8_t *)erase_check_code
);
721 if (retval
!= ERROR_OK
)
724 armv7m_info
.common_magic
= ARMV7M_COMMON_MAGIC
;
725 armv7m_info
.core_mode
= ARM_MODE_THREAD
;
727 init_reg_param(®_params
[0], "r0", 32, PARAM_OUT
);
728 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
730 init_reg_param(®_params
[1], "r1", 32, PARAM_OUT
);
731 buf_set_u32(reg_params
[1].value
, 0, 32, count
);
733 init_reg_param(®_params
[2], "r2", 32, PARAM_IN_OUT
);
734 buf_set_u32(reg_params
[2].value
, 0, 32, 0xff);
736 retval
= target_run_algorithm(target
,
741 erase_check_algorithm
->address
,
742 erase_check_algorithm
->address
+ (sizeof(erase_check_code
) - 2),
746 if (retval
== ERROR_OK
)
747 *blank
= buf_get_u32(reg_params
[2].value
, 0, 32);
749 destroy_reg_param(®_params
[0]);
750 destroy_reg_param(®_params
[1]);
751 destroy_reg_param(®_params
[2]);
753 target_free_working_area(target
, erase_check_algorithm
);
758 int armv7m_maybe_skip_bkpt_inst(struct target
*target
, bool *inst_found
)
760 struct armv7m_common
*armv7m
= target_to_armv7m(target
);
761 struct reg
*r
= armv7m
->arm
.pc
;
765 /* if we halted last time due to a bkpt instruction
766 * then we have to manually step over it, otherwise
767 * the core will break again */
769 if (target
->debug_reason
== DBG_REASON_BREAKPOINT
) {
771 uint32_t pc
= buf_get_u32(r
->value
, 0, 32);
774 if (target_read_u16(target
, pc
, &op
) == ERROR_OK
) {
775 if ((op
& 0xFF00) == 0xBE00) {
776 pc
= buf_get_u32(r
->value
, 0, 32) + 2;
777 buf_set_u32(r
->value
, 0, 32, pc
);
781 LOG_DEBUG("Skipping over BKPT instruction");
787 *inst_found
= result
;
792 const struct command_registration armv7m_command_handlers
[] = {
794 .chain
= arm_command_handlers
,
797 .chain
= dap_command_handlers
,
799 COMMAND_REGISTRATION_DONE