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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2006 by Magnus Lundin                                   *
   6  *   lundin@mlu.mine.nu                                                    *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
  12  *   oyvind.harboe@zylin.com                                               *
  13  *                                                                         *
  14  *   This program is free software; you can redistribute it and/or modify  *
  15  *   it under the terms of the GNU General Public License as published by  *
  16  *   the Free Software Foundation; either version 2 of the License, or     *
  17  *   (at your option) any later version.                                   *
  18  *                                                                         *
  19  *   This program is distributed in the hope that it will be useful,       *
  20  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  21  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  22  *   GNU General Public License for more details.                          *
  23  *                                                                         *
  24  *   You should have received a copy of the GNU General Public License     *
  25  *   along with this program; if not, write to the                         *
  26  *   Free Software Foundation, Inc.,                                       *
  27  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  28  *                                                                         *
  29  *   ARMv7-M Architecture, Application Level Reference Manual              *
  30  *              ARM DDI 0405C (September 2008)                             *
  31  *                                                                         *
  32  ***************************************************************************/
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36 #endif
  37
  38 #include "breakpoints.h"
  39 #include "armv7m.h"
  40 #include "algorithm.h"
  41 #include "register.h"
  42
  43 #if 0
  44 #define _DEBUG_INSTRUCTION_EXECUTION_
  45 #endif
  46
  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"
  52 };
  53
  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,
  60         ARMV7M_xPSR,
  61 };
  62
  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,
  69         ARMV7M_xPSR,
  70 };
  71
  72 #ifdef ARMV7_GDB_HACKS
  73 uint8_t armv7m_gdb_dummy_cpsr_value[] = {0, 0, 0, 0};
  74
  75 struct reg armv7m_gdb_dummy_cpsr_reg = {
  76         .name = "GDB dummy cpsr register",
  77         .value = armv7m_gdb_dummy_cpsr_value,
  78         .dirty = 0,
  79         .valid = 1,
  80         .size = 32,
  81         .arch_info = NULL,
  82 };
  83 #endif
  84
  85 /*
  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.
  89  *
  90  * The ARMv6-M profile is almost identical in this respect, except that it
  91  * doesn't include basepri or faultmask registers.
  92  */
  93 static const struct {
  94         unsigned id;
  95         const char *name;
  96         unsigned bits;
  97 } armv7m_regs[] = {
  98         { ARMV7M_R0, "r0", 32 },
  99         { ARMV7M_R1, "r1", 32 },
 100         { ARMV7M_R2, "r2", 32 },
 101         { ARMV7M_R3, "r3", 32 },
 102
 103         { ARMV7M_R4, "r4", 32 },
 104         { ARMV7M_R5, "r5", 32 },
 105         { ARMV7M_R6, "r6", 32 },
 106         { ARMV7M_R7, "r7", 32 },
 107
 108         { ARMV7M_R8, "r8", 32 },
 109         { ARMV7M_R9, "r9", 32 },
 110         { ARMV7M_R10, "r10", 32 },
 111         { ARMV7M_R11, "r11", 32 },
 112
 113         { ARMV7M_R12, "r12", 32 },
 114         { ARMV7M_R13, "sp", 32 },
 115         { ARMV7M_R14, "lr", 32 },
 116         { ARMV7M_PC, "pc", 32 },
 117
 118         { ARMV7M_xPSR, "xPSR", 32 },
 119         { ARMV7M_MSP, "msp", 32 },
 120         { ARMV7M_PSP, "psp", 32 },
 121
 122         { ARMV7M_PRIMASK, "primask", 1 },
 123         { ARMV7M_BASEPRI, "basepri", 8 },
 124         { ARMV7M_FAULTMASK, "faultmask", 1 },
 125         { ARMV7M_CONTROL, "control", 2 },
 126 };
 127
 128 #define ARMV7M_NUM_REGS ARRAY_SIZE(armv7m_regs)
 129
 130 /**
 131  * Restores target context using the cache of core registers set up
 132  * by armv7m_build_reg_cache(), calling optional core-specific hooks.
 133  */
 134 int armv7m_restore_context(struct target *target)
 135 {
 136         int i;
 137         struct armv7m_common *armv7m = target_to_armv7m(target);
 138         struct reg_cache *cache = armv7m->arm.core_cache;
 139
 140         LOG_DEBUG(" ");
 141
 142         if (armv7m->pre_restore_context)
 143                 armv7m->pre_restore_context(target);
 144
 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);
 149                 }
 150         }
 151
 152         return ERROR_OK;
 153 }
 154
 155 /* Core state functions */
 156
 157 /**
 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).
 163  */
 164 char *armv7m_exception_string(int number)
 165 {
 166         static char enamebuf[32];
 167
 168         if ((number < 0) | (number > 511))
 169                 return "Invalid exception";
 170         if (number < 16)
 171                 return armv7m_exception_strings[number];
 172         sprintf(enamebuf, "External Interrupt(%i)", number - 16);
 173         return enamebuf;
 174 }
 175
 176 static int armv7m_get_core_reg(struct reg *reg)
 177 {
 178         int retval;
 179         struct arm_reg *armv7m_reg = reg->arch_info;
 180         struct target *target = armv7m_reg->target;
 181         struct arm *arm = target_to_arm(target);
 182
 183         if (target->state != TARGET_HALTED)
 184                 return ERROR_TARGET_NOT_HALTED;
 185
 186         retval = arm->read_core_reg(target, reg, armv7m_reg->num, arm->core_mode);
 187
 188         return retval;
 189 }
 190
 191 static int armv7m_set_core_reg(struct reg *reg, uint8_t *buf)
 192 {
 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);
 196
 197         if (target->state != TARGET_HALTED)
 198                 return ERROR_TARGET_NOT_HALTED;
 199
 200         buf_set_u32(reg->value, 0, 32, value);
 201         reg->dirty = 1;
 202         reg->valid = 1;
 203
 204         return ERROR_OK;
 205 }
 206
 207 static int armv7m_read_core_reg(struct target *target, struct reg *r,
 208         int num, enum arm_mode mode)
 209 {
 210         uint32_t reg_value;
 211         int retval;
 212         struct arm_reg *armv7m_core_reg;
 213         struct armv7m_common *armv7m = target_to_armv7m(target);
 214
 215         assert(num < (int)armv7m->arm.core_cache->num_regs);
 216
 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, &reg_value);
 220
 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;
 224
 225         return retval;
 226 }
 227
 228 static int armv7m_write_core_reg(struct target *target, struct reg *r,
 229         int num, enum arm_mode mode, uint32_t value)
 230 {
 231         int retval;
 232         uint32_t reg_value;
 233         struct arm_reg *armv7m_core_reg;
 234         struct armv7m_common *armv7m = target_to_armv7m(target);
 235
 236         assert(num < (int)armv7m->arm.core_cache->num_regs);
 237
 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,
 242                         reg_value);
 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;
 247         }
 248
 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;
 252
 253         return ERROR_OK;
 254 }
 255
 256 /**
 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.
 261  */
 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)
 264 {
 265         struct armv7m_common *armv7m = target_to_armv7m(target);
 266         int i;
 267
 268         *reg_list_size = 26;
 269         *reg_list = malloc(sizeof(struct reg *) * (*reg_list_size));
 270
 271         /*
 272          * GDB register packet format for ARM:
 273          *  - the first 16 registers are r0..r15
 274          *  - (obsolete) 8 FPA registers
 275          *  - (obsolete) FPA status
 276          *  - CPSR
 277          */
 278         for (i = 0; i < 16; i++)
 279                 (*reg_list)[i] = &armv7m->arm.core_cache->reg_list[i];
 280
 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;
 284
 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;
 288
 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;
 292 #else
 293         (*reg_list)[25] = &armv7m->arm.core_cache->reg_list[ARMV7M_xPSR];
 294 #endif
 295
 296         return ERROR_OK;
 297 }
 298
 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)
 305 {
 306         int retval;
 307
 308         retval = armv7m_start_algorithm(target,
 309                         num_mem_params, mem_params,
 310                         num_reg_params, reg_params,
 311                         entry_point, exit_point,
 312                         arch_info);
 313
 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,
 319                                 arch_info);
 320
 321         return retval;
 322 }
 323
 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,
 329         void *arch_info)
 330 {
 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;
 335
 336         /* NOTE: armv7m_run_algorithm requires that each algorithm uses a software breakpoint
 337          * at the exit point */
 338
 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;
 342         }
 343
 344         if (target->state != TARGET_HALTED) {
 345                 LOG_WARNING("target not halted");
 346                 return ERROR_TARGET_NOT_HALTED;
 347         }
 348
 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++) {
 352
 353                 armv7m_algorithm_info->context[i] = buf_get_u32(
 354                                 armv7m->arm.core_cache->reg_list[i].value,
 355                                 0,
 356                                 32);
 357         }
 358
 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,
 362                                 mem_params[i].size,
 363                                 mem_params[i].value);
 364                 if (retval != ERROR_OK)
 365                         return retval;
 366         }
 367
 368         for (int i = 0; i < num_reg_params; i++) {
 369                 struct reg *reg =
 370                         register_get_by_name(armv7m->arm.core_cache, reg_params[i].reg_name, 0);
 371 /*              uint32_t regvalue; */
 372
 373                 if (!reg) {
 374                         LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 375                         return ERROR_COMMAND_SYNTAX_ERROR;
 376                 }
 377
 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;
 382                 }
 383
 384 /*              regvalue = buf_get_u32(reg_params[i].value, 0, 32); */
 385                 armv7m_set_core_reg(reg, reg_params[i].value);
 386         }
 387
 388         if (armv7m_algorithm_info->core_mode != ARM_MODE_ANY &&
 389                         armv7m_algorithm_info->core_mode != core_mode) {
 390
 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");
 395                 }
 396
 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;
 402         }
 403
 404         /* save previous core mode */
 405         armv7m_algorithm_info->core_mode = core_mode;
 406
 407         retval = target_resume(target, 0, entry_point, 1, 1);
 408
 409         return retval;
 410 }
 411
 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,
 417         void *arch_info)
 418 {
 419         struct armv7m_common *armv7m = target_to_armv7m(target);
 420         struct armv7m_algorithm *armv7m_algorithm_info = arch_info;
 421         int retval = ERROR_OK;
 422         uint32_t pc;
 423
 424         /* NOTE: armv7m_run_algorithm requires that each algorithm uses a software breakpoint
 425          * at the exit point */
 426
 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;
 430         }
 431
 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)
 437                         return retval;
 438                 retval = target_wait_state(target, TARGET_HALTED, 500);
 439                 if (retval != ERROR_OK)
 440                         return retval;
 441                 return ERROR_TARGET_TIMEOUT;
 442         }
 443
 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,
 447                         pc,
 448                         exit_point);
 449                 return ERROR_TARGET_TIMEOUT;
 450         }
 451
 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,
 456                                         mem_params[i].size,
 457                                         mem_params[i].value);
 458                         if (retval != ERROR_OK)
 459                                 return retval;
 460                 }
 461         }
 462
 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,
 468                                         0);
 469
 470                         if (!reg) {
 471                                 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 472                                 return ERROR_COMMAND_SYNTAX_ERROR;
 473                         }
 474
 475                         if (reg->size != reg_params[i].size) {
 476                                 LOG_ERROR(
 477                                         "BUG: register '%s' size doesn't match reg_params[i].size",
 478                                         reg_params[i].reg_name);
 479                                 return ERROR_COMMAND_SYNTAX_ERROR;
 480                         }
 481
 482                         buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
 483                 }
 484         }
 485
 486         for (int i = ARMV7M_NUM_REGS - 1; i >= 0; i--) {
 487                 uint32_t regvalue;
 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;
 497                 }
 498         }
 499
 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;
 507         }
 508
 509         armv7m->arm.core_mode = armv7m_algorithm_info->core_mode;
 510
 511         return retval;
 512 }
 513
 514 /** Logs summary of ARMv7-M state for a halted target. */
 515 int armv7m_arch_state(struct target *target)
 516 {
 517         struct armv7m_common *armv7m = target_to_armv7m(target);
 518         struct arm *arm = &armv7m->arm;
 519         uint32_t ctrl, sp;
 520
 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);
 523
 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',
 532                 sp,
 533                 arm->is_semihosting ? ", semihosting" : "");
 534
 535         return ERROR_OK;
 536 }
 537
 538 static const struct reg_arch_type armv7m_reg_type = {
 539         .get = armv7m_get_core_reg,
 540         .set = armv7m_set_core_reg,
 541 };
 542
 543 /** Builds cache of architecturally defined registers.  */
 544 struct reg_cache *armv7m_build_reg_cache(struct target *target)
 545 {
 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));
 553         int i;
 554
 555 #ifdef ARMV7_GDB_HACKS
 556         register_init_dummy(&armv7m_gdb_dummy_cpsr_reg);
 557 #endif
 558
 559         /* Build the process context cache */
 560         cache->name = "arm v7m registers";
 561         cache->next = NULL;
 562         cache->reg_list = reg_list;
 563         cache->num_regs = num_regs;
 564         (*cache_p) = cache;
 565
 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;
 570
 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];
 578         }
 579
 580         arm->cpsr = reg_list + ARMV7M_xPSR;
 581         arm->pc = reg_list + ARMV7M_PC;
 582         arm->core_cache = cache;
 583         return cache;
 584 }
 585
 586 static int armv7m_setup_semihosting(struct target *target, int enable)
 587 {
 588         /* nothing todo for armv7m */
 589         return ERROR_OK;
 590 }
 591
 592 /** Sets up target as a generic ARMv7-M core */
 593 int armv7m_init_arch_info(struct target *target, struct armv7m_common *armv7m)
 594 {
 595         struct arm *arm = &armv7m->arm;
 596
 597         armv7m->common_magic = ARMV7M_COMMON_MAGIC;
 598         armv7m->fp_feature = FP_NONE;
 599
 600         arm->core_type = ARM_MODE_THREAD;
 601         arm->arch_info = armv7m;
 602         arm->setup_semihosting = armv7m_setup_semihosting;
 603
 604         arm->read_core_reg = armv7m_read_core_reg;
 605         arm->write_core_reg = armv7m_write_core_reg;
 606
 607         return arm_init_arch_info(target, arm);
 608 }
 609
 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)
 613 {
 614         struct working_area *crc_algorithm;
 615         struct armv7m_algorithm armv7m_info;
 616         struct reg_param reg_params[2];
 617         int retval;
 618
 619         /* see contrib/loaders/checksum/armv7m_crc.s for src */
 620
 621         static const uint8_t cortex_m3_crc_code[] = {
 622                 /* main: */
 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 */
 630                 /* nbyte: */
 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 */
 635                 /* loop: */
 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 */
 641                 /* notset: */
 642                 0x40, 0x00,                     /* lsls         r0, r0, #1 */
 643                 /* cont: */
 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 */
 648                 /* ncomp: */
 649                 0x9C, 0x42,                     /* cmp          r4, r3 */
 650                 0xEF, 0xD1,                     /* bne          nbyte */
 651                 0x00, 0xBE,                     /* bkpt         #0 */
 652                 0xB7, 0x1D, 0xC1, 0x04  /* CRC32XOR:    .word   0x04c11db7 */
 653         };
 654
 655         retval = target_alloc_working_area(target, sizeof(cortex_m3_crc_code), &crc_algorithm);
 656         if (retval != ERROR_OK)
 657                 return retval;
 658
 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)
 662                 goto cleanup;
 663
 664         armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
 665         armv7m_info.core_mode = ARM_MODE_THREAD;
 666
 667         init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
 668         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
 669
 670         buf_set_u32(reg_params[0].value, 0, 32, address);
 671         buf_set_u32(reg_params[1].value, 0, 32, count);
 672
 673         int timeout = 20000 * (1 + (count / (1024 * 1024)));
 674
 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);
 678
 679         if (retval == ERROR_OK)
 680                 *checksum = buf_get_u32(reg_params[0].value, 0, 32);
 681         else
 682                 LOG_ERROR("error executing cortex_m crc algorithm");
 683
 684         destroy_reg_param(&reg_params[0]);
 685         destroy_reg_param(&reg_params[1]);
 686
 687 cleanup:
 688         target_free_working_area(target, crc_algorithm);
 689
 690         return retval;
 691 }
 692
 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)
 696 {
 697         struct working_area *erase_check_algorithm;
 698         struct reg_param reg_params[3];
 699         struct armv7m_algorithm armv7m_info;
 700         int retval;
 701
 702         /* see contrib/loaders/erase_check/armv7m_erase_check.s for src */
 703
 704         static const uint8_t erase_check_code[] = {
 705                 /* loop: */
 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 */
 712         };
 713
 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;
 718
 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)
 722                 return retval;
 723
 724         armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
 725         armv7m_info.core_mode = ARM_MODE_THREAD;
 726
 727         init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
 728         buf_set_u32(reg_params[0].value, 0, 32, address);
 729
 730         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
 731         buf_set_u32(reg_params[1].value, 0, 32, count);
 732
 733         init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
 734         buf_set_u32(reg_params[2].value, 0, 32, 0xff);
 735
 736         retval = target_run_algorithm(target,
 737                         0,
 738                         NULL,
 739                         3,
 740                         reg_params,
 741                         erase_check_algorithm->address,
 742                         erase_check_algorithm->address + (sizeof(erase_check_code) - 2),
 743                         10000,
 744                         &armv7m_info);
 745
 746         if (retval == ERROR_OK)
 747                 *blank = buf_get_u32(reg_params[2].value, 0, 32);
 748
 749         destroy_reg_param(&reg_params[0]);
 750         destroy_reg_param(&reg_params[1]);
 751         destroy_reg_param(&reg_params[2]);
 752
 753         target_free_working_area(target, erase_check_algorithm);
 754
 755         return retval;
 756 }
 757
 758 int armv7m_maybe_skip_bkpt_inst(struct target *target, bool *inst_found)
 759 {
 760         struct armv7m_common *armv7m = target_to_armv7m(target);
 761         struct reg *r = armv7m->arm.pc;
 762         bool result = false;
 763
 764
 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 */
 768
 769         if (target->debug_reason == DBG_REASON_BREAKPOINT) {
 770                 uint16_t op;
 771                 uint32_t pc = buf_get_u32(r->value, 0, 32);
 772
 773                 pc &= ~1;
 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);
 778                                 r->dirty = true;
 779                                 r->valid = true;
 780                                 result = true;
 781                                 LOG_DEBUG("Skipping over BKPT instruction");
 782                         }
 783                 }
 784         }
 785
 786         if (inst_found)
 787                 *inst_found = result;
 788
 789         return ERROR_OK;
 790 }
 791
 792 const struct command_registration armv7m_command_handlers[] = {
 793         {
 794                 .chain = arm_command_handlers,
 795         },
 796         {
 797                 .chain = dap_command_handlers,
 798         },
 799         COMMAND_REGISTRATION_DONE
 800 };