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         "Handler", "Thread"
  46 };
  47
  48 char* armv7m_state_strings[] =
  49 {
  50         "Thumb", "Debug"
  51 };
  52
  53 char* armv7m_exception_strings[] =
  54 {
  55         "", "Reset", "NMI", "HardFault", "MemManage", "BusFault", "UsageFault", "RESERVED", "RESERVED", "RESERVED", "RESERVED",
  56         "SVCall", "DebugMonitor", "RESERVED", "PendSV", "SysTick"
  57 };
  58
  59 char* armv7m_core_reg_list[] =
  60 {
  61         /* Registers accessed through core debug */
  62         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12",
  63         "sp", "lr", "pc",
  64         "xPSR", "msp", "psp",
  65         /* Registers accessed through MSR instructions */
  66         /* "apsr", "iapsr", "ipsr", "epsr", */
  67         "primask", "basepri", "faultmask", "control"
  68 };
  69
  70 char* armv7m_core_dbgreg_list[] =
  71 {
  72         /* Registers accessed through core debug */
  73         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12",
  74         "sp", "lr", "pc",
  75         "xPSR", "msp", "psp",
  76         /* Registers accessed through MSR instructions */
  77         /* "dbg_apsr", "iapsr", "ipsr", "epsr", */
  78         "primask", "basepri", "faultmask", "dbg_control"
  79 };
  80
  81 u8 armv7m_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  82
  83 reg_t armv7m_gdb_dummy_fp_reg =
  84 {
  85         "GDB dummy floating-point register", armv7m_gdb_dummy_fp_value, 0, 1, 96, NULL, 0, NULL, 0
  86 };
  87
  88 armv7m_core_reg_t armv7m_core_reg_list_arch_info[] =
  89 {
  90         /*  CORE_GP are accesible using the core debug registers */
  91         {0, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
  92         {1, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
  93         {2, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
  94         {3, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
  95         {4, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
  96         {5, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
  97         {6, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
  98         {7, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
  99         {8, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
 100         {9, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
 101         {10, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
 102         {11, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
 103         {12, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
 104         {13, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
 105         {14, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
 106         {15, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
 107
 108         {16, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* xPSR */
 109         {17, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* MSP */
 110         {18, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* PSP */
 111
 112         /*  CORE_SP are accesible using MSR and MRS instructions */
 113 #if 0
 114         {0x00, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* APSR */
 115         {0x01, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* IAPSR */
 116         {0x05, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* IPSR */
 117         {0x06, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* EPSR */
 118 #endif
 119
 120         {0x10, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* PRIMASK */
 121         {0x11, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* BASEPRI */
 122         {0x13, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* FAULTMASK */
 123         {0x14, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}  /* CONTROL */
 124 };
 125
 126 int armv7m_core_reg_arch_type = -1;
 127
 128 /* Keep different contexts for the process being debugged and debug algorithms */
 129 enum armv7m_runcontext armv7m_get_context(target_t *target)
 130 {
 131         /* get pointers to arch-specific information */
 132         armv7m_common_t *armv7m = target->arch_info;
 133
 134         if (armv7m->process_context == armv7m->core_cache)
 135                 return ARMV7M_PROCESS_CONTEXT;
 136         if (armv7m->debug_context == armv7m->core_cache)
 137                 return ARMV7M_DEBUG_CONTEXT;
 138
 139         ERROR("Invalid runcontext");
 140         exit(-1);
 141 }
 142
 143 int armv7m_use_context(target_t *target, enum armv7m_runcontext new_ctx)
 144 {
 145         int i;
 146         /* get pointers to arch-specific information */
 147         armv7m_common_t *armv7m = target->arch_info;
 148
 149         if ((target->state != TARGET_HALTED) && (target->state != TARGET_RESET))
 150         {
 151                 WARNING("target not halted, switch context ");
 152                 return ERROR_TARGET_NOT_HALTED;
 153         }
 154
 155         if (new_ctx == armv7m_get_context(target))
 156                 return ERROR_OK;
 157
 158         switch (new_ctx)
 159         {
 160                 case ARMV7M_PROCESS_CONTEXT:
 161                          armv7m->core_cache = armv7m->process_context;
 162                          break;
 163                 case ARMV7M_DEBUG_CONTEXT:
 164                          armv7m->core_cache = armv7m->debug_context;
 165                          break;
 166                 default:
 167                         ERROR("Invalid runcontext");
 168                         exit(-1);
 169         }
 170         /* Mark registers in new context as dirty to force reload when run */
 171
 172         for (i = 0; i < armv7m->core_cache->num_regs; i++)
 173         {
 174                 armv7m->core_cache->reg_list[i].dirty = 1;
 175         }
 176
 177         return ERROR_OK;
 178 }
 179
 180 int armv7m_restore_context(target_t *target)
 181 {
 182         int i;
 183
 184         /* get pointers to arch-specific information */
 185         armv7m_common_t *armv7m = target->arch_info;
 186
 187         DEBUG(" ");
 188
 189         if (armv7m->pre_restore_context)
 190                 armv7m->pre_restore_context(target);
 191
 192         for (i = ARMV7NUMCOREREGS-1; i >= 0; i--)
 193         {
 194                 if (armv7m->core_cache->reg_list[i].dirty)
 195                 {
 196                         armv7m->write_core_reg(target, i);
 197                 }
 198         }
 199
 200         if (armv7m->post_restore_context)
 201                 armv7m->post_restore_context(target);
 202
 203         return ERROR_OK;
 204 }
 205
 206 /* Core state functions */
 207 char *armv7m_exception_string(int number)
 208 {
 209         static char enamebuf[32];
 210
 211         if ((number < 0) | (number > 511))
 212                 return "Invalid exception";
 213         if (number < 16)
 214                 return armv7m_exception_strings[number];
 215         sprintf(enamebuf, "External Interrupt(%i)", number - 16);
 216         return enamebuf;
 217 }
 218
 219 int armv7m_get_core_reg(reg_t *reg)
 220 {
 221         int retval;
 222         armv7m_core_reg_t *armv7m_reg = reg->arch_info;
 223         target_t *target = armv7m_reg->target;
 224         armv7m_common_t *armv7m_target = target->arch_info;
 225
 226         if (target->state != TARGET_HALTED)
 227         {
 228                 return ERROR_TARGET_NOT_HALTED;
 229         }
 230
 231         retval = armv7m_target->read_core_reg(target, armv7m_reg->num);
 232
 233         return retval;
 234 }
 235
 236 int armv7m_set_core_reg(reg_t *reg, u8 *buf)
 237 {
 238         armv7m_core_reg_t *armv7m_reg = reg->arch_info;
 239         target_t *target = armv7m_reg->target;
 240         u32 value = buf_get_u32(buf, 0, 32);
 241
 242         if (target->state != TARGET_HALTED)
 243         {
 244                 return ERROR_TARGET_NOT_HALTED;
 245         }
 246
 247         buf_set_u32(reg->value, 0, 32, value);
 248         reg->dirty = 1;
 249         reg->valid = 1;
 250
 251         return ERROR_OK;
 252 }
 253
 254 int armv7m_read_core_reg(struct target_s *target, int num)
 255 {
 256         u32 reg_value;
 257         int retval;
 258         armv7m_core_reg_t * armv7m_core_reg;
 259
 260         /* get pointers to arch-specific information */
 261         armv7m_common_t *armv7m = target->arch_info;
 262
 263         if ((num < 0) || (num >= ARMV7NUMCOREREGS))
 264                 return ERROR_INVALID_ARGUMENTS;
 265
 266         armv7m_core_reg = armv7m->core_cache->reg_list[num].arch_info;
 267         retval = armv7m->load_core_reg_u32(target, armv7m_core_reg->type, armv7m_core_reg->num, &reg_value);
 268         buf_set_u32(armv7m->core_cache->reg_list[num].value, 0, 32, reg_value);
 269         armv7m->core_cache->reg_list[num].valid = 1;
 270         armv7m->core_cache->reg_list[num].dirty = 0;
 271
 272         return ERROR_OK;
 273 }
 274
 275 int armv7m_write_core_reg(struct target_s *target, int num)
 276 {
 277         int retval;
 278         u32 reg_value;
 279         armv7m_core_reg_t *armv7m_core_reg;
 280
 281         /* get pointers to arch-specific information */
 282         armv7m_common_t *armv7m = target->arch_info;
 283
 284         if ((num < 0) || (num >= ARMV7NUMCOREREGS))
 285                 return ERROR_INVALID_ARGUMENTS;
 286
 287         reg_value = buf_get_u32(armv7m->core_cache->reg_list[num].value, 0, 32);
 288         armv7m_core_reg = armv7m->core_cache->reg_list[num].arch_info;
 289         retval = armv7m->store_core_reg_u32(target, armv7m_core_reg->type, armv7m_core_reg->num, reg_value);
 290         if (retval != ERROR_OK)
 291         {
 292                 ERROR("JTAG failure");
 293                 armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
 294                 return ERROR_JTAG_DEVICE_ERROR;
 295         }
 296         DEBUG("write core reg %i value 0x%x", num , reg_value);
 297         armv7m->core_cache->reg_list[num].valid = 1;
 298         armv7m->core_cache->reg_list[num].dirty = 0;
 299
 300         return ERROR_OK;
 301 }
 302
 303 int armv7m_invalidate_core_regs(target_t *target)
 304 {
 305         /* get pointers to arch-specific information */
 306         armv7m_common_t *armv7m = target->arch_info;
 307         int i;
 308
 309         for (i = 0; i < armv7m->core_cache->num_regs; i++)
 310         {
 311                 armv7m->core_cache->reg_list[i].valid = 0;
 312                 armv7m->core_cache->reg_list[i].dirty = 0;
 313         }
 314
 315         return ERROR_OK;
 316 }
 317
 318 int armv7m_get_gdb_reg_list(target_t *target, reg_t **reg_list[], int *reg_list_size)
 319 {
 320         /* get pointers to arch-specific information */
 321         armv7m_common_t *armv7m = target->arch_info;
 322         int i;
 323
 324         *reg_list_size = 26;
 325         *reg_list = malloc(sizeof(reg_t*) * (*reg_list_size));
 326
 327         /* TODOLATER correct list of registers, names ? */
 328         for (i = 0; i < *reg_list_size; i++)
 329         {
 330                 if (i < ARMV7NUMCOREREGS)
 331                         (*reg_list)[i] = &armv7m->process_context->reg_list[i];
 332                 else
 333                         (*reg_list)[i] = &armv7m_gdb_dummy_fp_reg;
 334         }
 335         /* ARMV7M is always in thumb mode, try to make GDB understand this if it does not support this arch */
 336         armv7m->process_context->reg_list[15].value[0] |= 1;
 337         (*reg_list)[25] = &armv7m->process_context->reg_list[ARMV7M_xPSR];
 338         return ERROR_OK;
 339 }
 340
 341 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)
 342 {
 343         /* get pointers to arch-specific information */
 344         armv7m_common_t *armv7m = target->arch_info;
 345         armv7m_algorithm_t *armv7m_algorithm_info = arch_info;
 346         int retval = ERROR_OK;
 347         u32 pc;
 348         int i;
 349
 350         if (armv7m_algorithm_info->common_magic != ARMV7M_COMMON_MAGIC)
 351         {
 352                 ERROR("current target isn't an ARMV7M target");
 353                 return ERROR_TARGET_INVALID;
 354         }
 355
 356         if (target->state != TARGET_HALTED)
 357         {
 358                 WARNING("target not halted");
 359                 return ERROR_TARGET_NOT_HALTED;
 360         }
 361
 362         /* refresh core register cache */
 363         /* Not needed if core register cache is always consistent with target process state */
 364         armv7m_use_context(target, ARMV7M_DEBUG_CONTEXT);
 365
 366         for (i = 0; i < num_mem_params; i++)
 367         {
 368                 target_write_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value);
 369         }
 370
 371         for (i = 0; i < num_reg_params; i++)
 372         {
 373                 reg_t *reg = register_get_by_name(armv7m->core_cache, reg_params[i].reg_name, 0);
 374                 u32 regvalue;
 375
 376                 if (!reg)
 377                 {
 378                         ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 379                         exit(-1);
 380                 }
 381
 382                 if (reg->size != reg_params[i].size)
 383                 {
 384                         ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
 385                         exit(-1);
 386                 }
 387
 388                 regvalue = buf_get_u32(reg_params[i].value, 0, 32);
 389                 armv7m_set_core_reg(reg, reg_params[i].value);
 390         }
 391
 392         /* ARMV7M always runs in Thumb state */
 393         if ((retval = breakpoint_add(target, exit_point, 2, BKPT_SOFT)) != ERROR_OK)
 394         {
 395                 ERROR("can't add breakpoint to finish algorithm execution");
 396                 return ERROR_TARGET_FAILURE;
 397         }
 398
 399         /* This code relies on the target specific  resume() and  poll()->debug_entry()
 400         sequence to write register values to the processor and the read them back */
 401         target->type->resume(target, 0, entry_point, 1, 1);
 402         target->type->poll(target);
 403
 404         while (target->state != TARGET_HALTED)
 405         {
 406                 usleep(5000);
 407                 target->type->poll(target);
 408                 if ((timeout_ms -= 5) <= 0)
 409                 {
 410                         ERROR("timeout waiting for algorithm to complete, trying to halt target");
 411                         target->type->halt(target);
 412                         timeout_ms = 1000;
 413                         while (target->state != TARGET_HALTED)
 414                         {
 415                                 usleep(10000);
 416                                 target->type->poll(target);
 417                                 if ((timeout_ms -= 10) <= 0)
 418                                 {
 419                                         ERROR("target didn't reenter debug state, exiting");
 420                                         exit(-1);
 421                                 }
 422                         }
 423                         armv7m->load_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 15, &pc);
 424                         DEBUG("failed algoritm halted at 0x%x ", pc);
 425                         retval = ERROR_TARGET_TIMEOUT;
 426                 }
 427         }
 428
 429         breakpoint_remove(target, exit_point);
 430
 431         /* Read memory values to mem_params[] */
 432         for (i = 0; i < num_mem_params; i++)
 433         {
 434                 if (mem_params[i].direction != PARAM_OUT)
 435                         target_read_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value);
 436         }
 437
 438         /* Copy core register values to reg_params[] */
 439         for (i = 0; i < num_reg_params; i++)
 440         {
 441                 if (reg_params[i].direction != PARAM_OUT)
 442                 {
 443                         reg_t *reg = register_get_by_name(armv7m->debug_context, reg_params[i].reg_name, 0);
 444
 445                         if (!reg)
 446                         {
 447                                 ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 448                                 exit(-1);
 449                         }
 450
 451                         if (reg->size != reg_params[i].size)
 452                         {
 453                                 ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
 454                                 exit(-1);
 455                         }
 456
 457                         buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
 458                 }
 459         }
 460
 461         return retval;
 462 }
 463
 464 int armv7m_arch_state(struct target_s *target)
 465 {
 466         /* get pointers to arch-specific information */
 467         armv7m_common_t *armv7m = target->arch_info;
 468
 469         USER("target halted in %s state due to %s, current mode: %s %s\nxPSR: 0x%8.8x pc: 0x%8.8x",
 470                  armv7m_state_strings[armv7m->core_state],
 471                  target_debug_reason_strings[target->debug_reason],
 472                  armv7m_mode_strings[armv7m->core_mode],
 473                  armv7m_exception_string(armv7m->exception_number),
 474                  buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32),
 475                  buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32));
 476
 477         return ERROR_OK;
 478 }
 479
 480 reg_cache_t *armv7m_build_reg_cache(target_t *target)
 481 {
 482         /* get pointers to arch-specific information */
 483         armv7m_common_t *armv7m = target->arch_info;
 484
 485         int num_regs = ARMV7NUMCOREREGS;
 486         reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 487         reg_cache_t *cache = malloc(sizeof(reg_cache_t));
 488         reg_t *reg_list = malloc(sizeof(reg_t) * num_regs);
 489         armv7m_core_reg_t *arch_info = malloc(sizeof(armv7m_core_reg_t) * num_regs);
 490         int i;
 491
 492         if (armv7m_core_reg_arch_type == -1)
 493                 armv7m_core_reg_arch_type = register_reg_arch_type(armv7m_get_core_reg, armv7m_set_core_reg);
 494
 495         /* Build the process context cache */
 496         cache->name = "arm v7m registers";
 497         cache->next = NULL;
 498         cache->reg_list = reg_list;
 499         cache->num_regs = num_regs;
 500         (*cache_p) = cache;
 501         armv7m->core_cache = cache;
 502         armv7m->process_context = cache;
 503
 504         for (i = 0; i < num_regs; i++)
 505         {
 506                 arch_info[i] = armv7m_core_reg_list_arch_info[i];
 507                 arch_info[i].target = target;
 508                 arch_info[i].armv7m_common = armv7m;
 509                 reg_list[i].name = armv7m_core_reg_list[i];
 510                 reg_list[i].size = 32;
 511                 reg_list[i].value = calloc(1, 4);
 512                 reg_list[i].dirty = 0;
 513                 reg_list[i].valid = 0;
 514                 reg_list[i].bitfield_desc = NULL;
 515                 reg_list[i].num_bitfields = 0;
 516                 reg_list[i].arch_type = armv7m_core_reg_arch_type;
 517                 reg_list[i].arch_info = &arch_info[i];
 518         }
 519
 520         /* Build the debug context cache*/
 521         cache = malloc(sizeof(reg_cache_t));
 522         reg_list = malloc(sizeof(reg_t) * num_regs);
 523
 524         cache->name = "arm v7m debug registers";
 525         cache->next = NULL;
 526         cache->reg_list = reg_list;
 527         cache->num_regs = num_regs;
 528         armv7m->debug_context = cache;
 529         armv7m->process_context->next = cache;
 530
 531         for (i = 0; i < num_regs; i++)
 532         {
 533                 reg_list[i].name = armv7m_core_dbgreg_list[i];
 534                 reg_list[i].size = 32;
 535                 reg_list[i].value = calloc(1, 4);
 536                 reg_list[i].dirty = 0;
 537                 reg_list[i].valid = 0;
 538                 reg_list[i].bitfield_desc = NULL;
 539                 reg_list[i].num_bitfields = 0;
 540                 reg_list[i].arch_type = armv7m_core_reg_arch_type;
 541                 reg_list[i].arch_info = &arch_info[i];
 542         }
 543
 544         return cache;
 545 }
 546
 547 int armv7m_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 548 {
 549         armv7m_build_reg_cache(target);
 550
 551         return ERROR_OK;
 552 }
 553
 554 int armv7m_init_arch_info(target_t *target, armv7m_common_t *armv7m)
 555 {
 556         /* register arch-specific functions */
 557
 558         target->arch_info = armv7m;
 559         armv7m->core_state = ARMV7M_STATE_THUMB;
 560         armv7m->read_core_reg = armv7m_read_core_reg;
 561         armv7m->write_core_reg = armv7m_write_core_reg;
 562
 563         return ERROR_OK;
 564 }
 565
 566 int armv7m_register_commands(struct command_context_s *cmd_ctx)
 567 {
 568         return ERROR_OK;
 569 }
 570
 571 int armv7m_checksum_memory(struct target_s *target, u32 address, u32 count, u32* checksum)
 572 {
 573         working_area_t *crc_algorithm;
 574         armv7m_algorithm_t armv7m_info;
 575         reg_param_t reg_params[2];
 576         int retval;
 577
 578         u16 cortex_m3_crc_code[] = {
 579                 0x4602,                                 /* mov  r2, r0 */
 580                 0xF04F, 0x30FF,                 /* mov  r0, #0xffffffff */
 581                 0x460B,                                 /* mov  r3, r1 */
 582                 0xF04F, 0x0400,                 /* mov  r4, #0 */
 583                 0xE013,                                 /* b    ncomp */
 584                                                                 /* nbyte: */
 585                 0x5D11,                                 /* ldrb r1, [r2, r4] */
 586                 0xF8DF, 0x7028,                 /* ldr          r7, CRC32XOR */
 587                 0xEA80, 0x6001,                 /* eor          r0, r0, r1, asl #24 */
 588
 589                 0xF04F, 0x0500,                 /* mov          r5, #0 */
 590                                                                 /* loop: */
 591                 0x2800,                                 /* cmp          r0, #0 */
 592                 0xEA4F, 0x0640,                 /* mov          r6, r0, asl #1 */
 593                 0xF105, 0x0501,                 /* add          r5, r5, #1 */
 594                 0x4630,                                 /* mov          r0, r6 */
 595                 0xBFB8,                                 /* it           lt */
 596                 0xEA86, 0x0007,                 /* eor          r0, r6, r7 */
 597                 0x2D08,                                 /* cmp          r5, #8 */
 598                 0xD1F4,                                 /* bne          loop */
 599
 600                 0xF104, 0x0401,                 /* add  r4, r4, #1 */
 601                                                                 /* ncomp: */
 602                 0x429C,                                 /* cmp  r4, r3 */
 603                 0xD1E9,                                 /* bne  nbyte */
 604                                                                 /* end: */
 605                 0xE7FE,                                 /* b    end */
 606                 0x1DB7, 0x04C1                  /* CRC32XOR:    .word 0x04C11DB7 */
 607         };
 608
 609         int i;
 610
 611         if (target_alloc_working_area(target, sizeof(cortex_m3_crc_code), &crc_algorithm) != ERROR_OK)
 612         {
 613                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 614         }
 615
 616         /* convert flash writing code into a buffer in target endianness */
 617         for (i = 0; i < (sizeof(cortex_m3_crc_code)/sizeof(u16)); i++)
 618                 target_write_u16(target, crc_algorithm->address + i*sizeof(u16), cortex_m3_crc_code[i]);
 619
 620         armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
 621         armv7m_info.core_mode = ARMV7M_MODE_ANY;
 622         armv7m_info.core_state = ARMV7M_STATE_THUMB;
 623
 624         init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
 625         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
 626
 627         buf_set_u32(reg_params[0].value, 0, 32, address);
 628         buf_set_u32(reg_params[1].value, 0, 32, count);
 629
 630         if ((retval = target->type->run_algorithm(target, 0, NULL, 2, reg_params,
 631                 crc_algorithm->address, crc_algorithm->address + (sizeof(cortex_m3_crc_code)-6), 20000, &armv7m_info)) != ERROR_OK)
 632         {
 633                 ERROR("error executing cortex_m3 crc algorithm");
 634                 destroy_reg_param(&reg_params[0]);
 635                 destroy_reg_param(&reg_params[1]);
 636                 target_free_working_area(target, crc_algorithm);
 637                 return retval;
 638         }
 639
 640         *checksum = buf_get_u32(reg_params[0].value, 0, 32);
 641
 642         destroy_reg_param(&reg_params[0]);
 643         destroy_reg_param(&reg_params[1]);
 644
 645         target_free_working_area(target, crc_algorithm);
 646
 647         return ERROR_OK;
 648 }
 649