Reset wip. Just adding hooks. This is just to reduce the size of the actual change...
[fw/openocd] / 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  *   This program is free software; you can redistribute it and/or modify  *
9  *   it under the terms of the GNU General Public License as published by  *
10  *   the Free Software Foundation; either version 2 of the License, or     *
11  *   (at your option) any later version.                                   *
12  *                                                                         *
13  *   This program is distributed in the hope that it will be useful,       *
14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
16  *   GNU General Public License for more details.                          *
17  *                                                                         *
18  *   You should have received a copy of the GNU General Public License     *
19  *   along with this program; if not, write to the                         *
20  *   Free Software Foundation, Inc.,                                       *
21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
22  ***************************************************************************/
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include "replacements.h"
28
29 #include "armv7m.h"
30 #include "register.h"
31 #include "target.h"
32 #include "log.h"
33 #include "jtag.h"
34 #include "arm_jtag.h"
35
36 #include <stdlib.h>
37 #include <string.h>
38
39 #if 0
40 #define _DEBUG_INSTRUCTION_EXECUTION_
41 #endif
42
43 char* armv7m_mode_strings[] =
44 {
45         "Thread", "Thread (User)", "Handler", 
46 };
47
48 char* armv7m_exception_strings[] =
49 {
50         "", "Reset", "NMI", "HardFault", "MemManage", "BusFault", "UsageFault", "RESERVED", "RESERVED", "RESERVED", "RESERVED",
51         "SVCall", "DebugMonitor", "RESERVED", "PendSV", "SysTick"
52 };
53
54 char* armv7m_core_reg_list[] =
55 {
56         /* Registers accessed through core debug */
57         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12",
58         "sp", "lr", "pc",
59         "xPSR", "msp", "psp",
60         /* Registers accessed through special reg 20 */
61         "primask", "basepri", "faultmask", "control"
62 };
63
64 u8 armv7m_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
65
66 reg_t armv7m_gdb_dummy_fp_reg =
67 {
68         "GDB dummy floating-point register", armv7m_gdb_dummy_fp_value, 0, 1, 96, NULL, 0, NULL, 0
69 };
70
71 u8 armv7m_gdb_dummy_fps_value[] = {0, 0, 0, 0};
72
73 reg_t armv7m_gdb_dummy_fps_reg =
74 {
75         "GDB dummy floating-point status register", armv7m_gdb_dummy_fps_value, 0, 1, 32, NULL, 0, NULL, 0
76 };
77
78 armv7m_core_reg_t armv7m_core_reg_list_arch_info[] = 
79 {
80         /*  CORE_GP are accesible using the core debug registers */
81         {0, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
82         {1, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
83         {2, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
84         {3, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
85         {4, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
86         {5, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
87         {6, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
88         {7, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
89         {8, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
90         {9, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
91         {10, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
92         {11, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
93         {12, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
94         {13, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
95         {14, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},     
96         {15, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
97
98         {16, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* xPSR */
99         {17, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* MSP */
100         {18, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* PSP */
101
102         /*  CORE_SP are accesible using coreregister 20 */
103         {19, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* PRIMASK */
104         {20, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* BASEPRI */
105         {21, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* FAULTMASK */
106         {22, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}  /* CONTROL */
107 };
108
109 int armv7m_core_reg_arch_type = -1;
110
111 int armv7m_restore_context(target_t *target)
112 {
113         int i;
114         
115         /* get pointers to arch-specific information */
116         armv7m_common_t *armv7m = target->arch_info;
117
118         LOG_DEBUG(" ");
119
120         if (armv7m->pre_restore_context)
121                 armv7m->pre_restore_context(target);
122                 
123         for (i = ARMV7NUMCOREREGS-1; i >= 0; i--)
124         {
125                 if (armv7m->core_cache->reg_list[i].dirty)
126                 {
127                         armv7m->write_core_reg(target, i);
128                 }
129         }
130         
131         if (armv7m->post_restore_context)
132                 armv7m->post_restore_context(target);
133                 
134         return ERROR_OK;                
135 }
136
137 /* Core state functions */
138 char *armv7m_exception_string(int number)
139 {
140         static char enamebuf[32];
141         
142         if ((number < 0) | (number > 511))
143                 return "Invalid exception";
144         if (number < 16)
145                 return armv7m_exception_strings[number];
146         sprintf(enamebuf, "External Interrupt(%i)", number - 16);
147         return enamebuf;
148 }
149
150 int armv7m_get_core_reg(reg_t *reg)
151 {
152         int retval;
153         armv7m_core_reg_t *armv7m_reg = reg->arch_info;
154         target_t *target = armv7m_reg->target;
155         armv7m_common_t *armv7m_target = target->arch_info;
156         
157         if (target->state != TARGET_HALTED)
158         {
159                 return ERROR_TARGET_NOT_HALTED;
160         }
161
162         retval = armv7m_target->read_core_reg(target, armv7m_reg->num);
163         
164         return retval;
165 }
166
167 int armv7m_set_core_reg(reg_t *reg, u8 *buf)
168 {
169         armv7m_core_reg_t *armv7m_reg = reg->arch_info;
170         target_t *target = armv7m_reg->target;
171         u32 value = buf_get_u32(buf, 0, 32);
172                 
173         if (target->state != TARGET_HALTED)
174         {
175                 return ERROR_TARGET_NOT_HALTED;
176         }
177                 
178         buf_set_u32(reg->value, 0, 32, value);
179         reg->dirty = 1;
180         reg->valid = 1;
181
182         return ERROR_OK;
183 }
184
185 int armv7m_read_core_reg(struct target_s *target, int num)
186 {
187         u32 reg_value;
188         int retval;
189         armv7m_core_reg_t * armv7m_core_reg;
190         
191         /* get pointers to arch-specific information */
192         armv7m_common_t *armv7m = target->arch_info;
193                 
194         if ((num < 0) || (num >= ARMV7NUMCOREREGS))
195                 return ERROR_INVALID_ARGUMENTS;
196
197         armv7m_core_reg = armv7m->core_cache->reg_list[num].arch_info;
198         retval = armv7m->load_core_reg_u32(target, armv7m_core_reg->type, armv7m_core_reg->num, &reg_value);
199         buf_set_u32(armv7m->core_cache->reg_list[num].value, 0, 32, reg_value);
200         armv7m->core_cache->reg_list[num].valid = 1;
201         armv7m->core_cache->reg_list[num].dirty = 0;
202                 
203         return ERROR_OK;        
204 }
205
206 int armv7m_write_core_reg(struct target_s *target, int num)
207 {
208         int retval;
209         u32 reg_value;
210         armv7m_core_reg_t *armv7m_core_reg;
211         
212         /* get pointers to arch-specific information */
213         armv7m_common_t *armv7m = target->arch_info;
214
215         if ((num < 0) || (num >= ARMV7NUMCOREREGS))
216                 return ERROR_INVALID_ARGUMENTS;
217         
218         reg_value = buf_get_u32(armv7m->core_cache->reg_list[num].value, 0, 32);
219         armv7m_core_reg = armv7m->core_cache->reg_list[num].arch_info;
220         retval = armv7m->store_core_reg_u32(target, armv7m_core_reg->type, armv7m_core_reg->num, reg_value);
221         if (retval != ERROR_OK)
222         {
223                 LOG_ERROR("JTAG failure");
224                 armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
225                 return ERROR_JTAG_DEVICE_ERROR;
226         }
227         LOG_DEBUG("write core reg %i value 0x%x", num , reg_value);
228         armv7m->core_cache->reg_list[num].valid = 1;
229         armv7m->core_cache->reg_list[num].dirty = 0;
230         
231         return ERROR_OK;
232 }
233
234 int armv7m_invalidate_core_regs(target_t *target)
235 {
236         /* get pointers to arch-specific information */
237         armv7m_common_t *armv7m = target->arch_info;
238         int i;
239         
240         for (i = 0; i < armv7m->core_cache->num_regs; i++)
241         {
242                 armv7m->core_cache->reg_list[i].valid = 0;
243                 armv7m->core_cache->reg_list[i].dirty = 0;
244         }
245         
246         return ERROR_OK;
247 }
248
249 int armv7m_get_gdb_reg_list(target_t *target, reg_t **reg_list[], int *reg_list_size)
250 {
251         /* get pointers to arch-specific information */
252         armv7m_common_t *armv7m = target->arch_info;
253         int i;
254         
255         *reg_list_size = 26;
256         *reg_list = malloc(sizeof(reg_t*) * (*reg_list_size));
257         
258         for (i = 0; i < 16; i++)
259         {
260                 (*reg_list)[i] = &armv7m->core_cache->reg_list[i];
261         }
262         
263         for (i = 16; i < 24; i++)
264         {
265                 (*reg_list)[i] = &armv7m_gdb_dummy_fp_reg;
266         }
267         
268         (*reg_list)[24] = &armv7m_gdb_dummy_fps_reg;
269         
270         /* ARMV7M is always in thumb mode, try to make GDB understand this
271          * if it does not support this arch */
272         armv7m->core_cache->reg_list[15].value[0] |= 1;
273         (*reg_list)[25] = &armv7m->core_cache->reg_list[ARMV7M_xPSR];
274         return ERROR_OK;
275 }
276
277 int armv7m_run_algorithm(struct target_s *target, int num_mem_params, mem_param_t *mem_params, int num_reg_params, reg_param_t *reg_params, u32 entry_point, u32 exit_point, int timeout_ms, void *arch_info)
278 {
279         /* get pointers to arch-specific information */
280         armv7m_common_t *armv7m = target->arch_info;
281         armv7m_algorithm_t *armv7m_algorithm_info = arch_info;
282         enum armv7m_mode core_mode = armv7m->core_mode;
283         int retval = ERROR_OK;
284         u32 pc;
285         int i;
286         u32 context[ARMV7NUMCOREREGS];
287         
288         if (armv7m_algorithm_info->common_magic != ARMV7M_COMMON_MAGIC)
289         {
290                 LOG_ERROR("current target isn't an ARMV7M target");
291                 return ERROR_TARGET_INVALID;
292         }
293         
294         if (target->state != TARGET_HALTED)
295         {
296                 LOG_WARNING("target not halted");
297                 return ERROR_TARGET_NOT_HALTED;
298         }
299         
300         /* refresh core register cache */
301         /* Not needed if core register cache is always consistent with target process state */ 
302         for (i = 0; i < ARMV7NUMCOREREGS; i++)
303         {
304                 if (!armv7m->core_cache->reg_list[i].valid)
305                         armv7m->read_core_reg(target, i);
306                 context[i] = buf_get_u32(armv7m->core_cache->reg_list[i].value, 0, 32);
307         }
308         
309         for (i = 0; i < num_mem_params; i++)
310         {
311                 target_write_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value);
312         }
313         
314         for (i = 0; i < num_reg_params; i++)
315         {
316                 reg_t *reg = register_get_by_name(armv7m->core_cache, reg_params[i].reg_name, 0);
317                 u32 regvalue;
318                 
319                 if (!reg)
320                 {
321                         LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
322                         exit(-1);
323                 }
324                 
325                 if (reg->size != reg_params[i].size)
326                 {
327                         LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
328                         exit(-1);
329                 }
330                 
331                 regvalue = buf_get_u32(reg_params[i].value, 0, 32);
332                 armv7m_set_core_reg(reg, reg_params[i].value);
333         }
334         
335         if (armv7m_algorithm_info->core_mode != ARMV7M_MODE_ANY)
336         {
337                 LOG_DEBUG("setting core_mode: 0x%2.2x", armv7m_algorithm_info->core_mode);
338                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value, 0, 1, armv7m_algorithm_info->core_mode);
339                 armv7m->core_cache->reg_list[ARMV7M_CONTROL].dirty = 1;
340                 armv7m->core_cache->reg_list[ARMV7M_CONTROL].valid = 1;
341         }
342         
343         /* ARMV7M always runs in Thumb state */
344         if ((retval = breakpoint_add(target, exit_point, 2, BKPT_SOFT)) != ERROR_OK)
345         {
346                 LOG_ERROR("can't add breakpoint to finish algorithm execution");
347                 return ERROR_TARGET_FAILURE;
348         }
349         
350         /* This code relies on the target specific  resume() and  poll()->debug_entry() 
351         sequence to write register values to the processor and the read them back */
352         target_resume(target, 0, entry_point, 1, 1);
353         target_poll(target);
354         
355         while (target->state != TARGET_HALTED)
356         {
357                 usleep(5000);
358                 target_poll(target);
359                 if ((timeout_ms -= 5) <= 0)
360                 {
361                         LOG_ERROR("timeout waiting for algorithm to complete, trying to halt target");
362                         target_halt(target);
363                         timeout_ms = 1000;
364                         while (target->state != TARGET_HALTED)
365                         {
366                                 usleep(10000);
367                                 target_poll(target);
368                                 if ((timeout_ms -= 10) <= 0)
369                                 {
370                                         LOG_ERROR("target didn't reenter debug state, exiting");
371                                         exit(-1);
372                                 }
373                         }
374                         armv7m->load_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 15, &pc);
375                         LOG_DEBUG("failed algoritm halted at 0x%x ", pc); 
376                         retval = ERROR_TARGET_TIMEOUT;
377                 }
378         }
379         
380         breakpoint_remove(target, exit_point);
381         
382         /* Read memory values to mem_params[] */
383         for (i = 0; i < num_mem_params; i++)
384         {
385                 if (mem_params[i].direction != PARAM_OUT)
386                         target_read_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value);
387         }
388         
389         /* Copy core register values to reg_params[] */
390         for (i = 0; i < num_reg_params; i++)
391         {
392                 if (reg_params[i].direction != PARAM_OUT)
393                 {
394                         reg_t *reg = register_get_by_name(armv7m->core_cache, reg_params[i].reg_name, 0);
395                 
396                         if (!reg)
397                         {
398                                 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
399                                 exit(-1);
400                         }
401                         
402                         if (reg->size != reg_params[i].size)
403                         {
404                                 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
405                                 exit(-1);
406                         }
407                         
408                         buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
409                 }
410         }
411         
412         for (i = ARMV7NUMCOREREGS-1; i >= 0; i--)
413         {
414                 LOG_DEBUG("restoring register %s with value 0x%8.8x", armv7m->core_cache->reg_list[i].name, context[i]);
415                 buf_set_u32(armv7m->core_cache->reg_list[i].value, 0, 32, context[i]);
416                 armv7m->core_cache->reg_list[i].valid = 1;
417                 armv7m->core_cache->reg_list[i].dirty = 1;
418         }
419         
420         armv7m->core_mode = core_mode;
421         
422         return retval;
423 }
424
425 int armv7m_arch_state(struct target_s *target)
426 {
427         /* get pointers to arch-specific information */
428         armv7m_common_t *armv7m = target->arch_info;
429         
430         LOG_USER("target halted due to %s, current mode: %s %s\nxPSR: 0x%8.8x pc: 0x%8.8x",
431                 target_debug_reason_strings[target->debug_reason],
432                 armv7m_mode_strings[armv7m->core_mode],
433                 armv7m_exception_string(armv7m->exception_number),
434                 buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32),
435                 buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32));
436         
437         return ERROR_OK;
438 }
439
440 reg_cache_t *armv7m_build_reg_cache(target_t *target)
441 {
442         /* get pointers to arch-specific information */
443         armv7m_common_t *armv7m = target->arch_info;
444
445         int num_regs = ARMV7NUMCOREREGS;
446         reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
447         reg_cache_t *cache = malloc(sizeof(reg_cache_t));
448         reg_t *reg_list = malloc(sizeof(reg_t) * num_regs);
449         armv7m_core_reg_t *arch_info = malloc(sizeof(armv7m_core_reg_t) * num_regs);
450         int i;
451         
452         if (armv7m_core_reg_arch_type == -1)
453                 armv7m_core_reg_arch_type = register_reg_arch_type(armv7m_get_core_reg, armv7m_set_core_reg);
454                 
455         /* Build the process context cache */ 
456         cache->name = "arm v7m registers";
457         cache->next = NULL;
458         cache->reg_list = reg_list;
459         cache->num_regs = num_regs;
460         (*cache_p) = cache;
461         armv7m->core_cache = cache;
462         
463         for (i = 0; i < num_regs; i++)
464         {
465                 arch_info[i] = armv7m_core_reg_list_arch_info[i];
466                 arch_info[i].target = target;
467                 arch_info[i].armv7m_common = armv7m;
468                 reg_list[i].name = armv7m_core_reg_list[i];
469                 reg_list[i].size = 32;
470                 reg_list[i].value = calloc(1, 4);
471                 reg_list[i].dirty = 0;
472                 reg_list[i].valid = 0;
473                 reg_list[i].bitfield_desc = NULL;
474                 reg_list[i].num_bitfields = 0;
475                 reg_list[i].arch_type = armv7m_core_reg_arch_type;
476                 reg_list[i].arch_info = &arch_info[i];
477         }
478         
479         return cache;
480 }
481
482 int armv7m_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
483 {
484         armv7m_build_reg_cache(target);
485         
486         return ERROR_OK;
487 }
488
489 int armv7m_init_arch_info(target_t *target, armv7m_common_t *armv7m)
490 {
491         /* register arch-specific functions */
492         
493         target->arch_info = armv7m;
494         armv7m->read_core_reg = armv7m_read_core_reg;
495         armv7m->write_core_reg = armv7m_write_core_reg;
496         
497         return ERROR_OK;
498 }
499
500 int armv7m_register_commands(struct command_context_s *cmd_ctx)
501 {
502         return ERROR_OK;
503 }
504
505 int armv7m_checksum_memory(struct target_s *target, u32 address, u32 count, u32* checksum)
506 {
507         working_area_t *crc_algorithm;
508         armv7m_algorithm_t armv7m_info;
509         reg_param_t reg_params[2];
510         int retval;
511         
512         u16 cortex_m3_crc_code[] = {        
513                 0x4602,                                 /* mov  r2, r0 */
514                 0xF04F, 0x30FF,                 /* mov  r0, #0xffffffff */
515                 0x460B,                                 /* mov  r3, r1 */
516                 0xF04F, 0x0400,                 /* mov  r4, #0 */
517                 0xE013,                                 /* b    ncomp */
518                                                                 /* nbyte: */
519                 0x5D11,                                 /* ldrb r1, [r2, r4] */
520                 0xF8DF, 0x7028,                 /* ldr          r7, CRC32XOR */
521                 0xEA80, 0x6001,                 /* eor          r0, r0, r1, asl #24 */
522                 
523                 0xF04F, 0x0500,                 /* mov          r5, #0 */
524                                                                 /* loop: */
525                 0x2800,                                 /* cmp          r0, #0 */
526                 0xEA4F, 0x0640,                 /* mov          r6, r0, asl #1 */
527                 0xF105, 0x0501,                 /* add          r5, r5, #1 */
528                 0x4630,                                 /* mov          r0, r6 */
529                 0xBFB8,                                 /* it           lt */
530                 0xEA86, 0x0007,                 /* eor          r0, r6, r7 */
531                 0x2D08,                                 /* cmp          r5, #8 */
532                 0xD1F4,                                 /* bne          loop */
533                 
534                 0xF104, 0x0401,                 /* add  r4, r4, #1 */
535                                                                 /* ncomp: */
536                 0x429C,                                 /* cmp  r4, r3 */
537                 0xD1E9,                                 /* bne  nbyte */
538                                                                 /* end: */
539                 0xE7FE,                                 /* b    end */
540                 0x1DB7, 0x04C1                  /* CRC32XOR:    .word 0x04C11DB7 */
541         };
542
543         int i;
544         
545         if (target_alloc_working_area(target, sizeof(cortex_m3_crc_code), &crc_algorithm) != ERROR_OK)
546         {
547                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
548         }
549         
550         /* convert flash writing code into a buffer in target endianness */
551         for (i = 0; i < (sizeof(cortex_m3_crc_code)/sizeof(u16)); i++)
552                 target_write_u16(target, crc_algorithm->address + i*sizeof(u16), cortex_m3_crc_code[i]);
553         
554         armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
555         armv7m_info.core_mode = ARMV7M_MODE_ANY;
556         
557         init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
558         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
559         
560         buf_set_u32(reg_params[0].value, 0, 32, address);
561         buf_set_u32(reg_params[1].value, 0, 32, count);
562                 
563         if ((retval = target->type->run_algorithm(target, 0, NULL, 2, reg_params,
564                 crc_algorithm->address, crc_algorithm->address + (sizeof(cortex_m3_crc_code)-6), 20000, &armv7m_info)) != ERROR_OK)
565         {
566                 LOG_ERROR("error executing cortex_m3 crc algorithm");
567                 destroy_reg_param(&reg_params[0]);
568                 destroy_reg_param(&reg_params[1]);
569                 target_free_working_area(target, crc_algorithm);
570                 return retval;
571         }
572         
573         *checksum = buf_get_u32(reg_params[0].value, 0, 32);
574         
575         destroy_reg_param(&reg_params[0]);
576         destroy_reg_param(&reg_params[1]);
577         
578         target_free_working_area(target, crc_algorithm);
579         
580         return ERROR_OK;
581 }
582
583