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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by Spencer Oliver                                  *
   6  *   spen@spen-soft.co.uk                                                  *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Oyvind Harboe                                   *
   9  *   oyvind.harboe@zylin.com                                               *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "armv4_5.h"
  31 #include "arm_jtag.h"
  32 #include "breakpoints.h"
  33 #include "arm_disassembler.h"
  34 #include "binarybuffer.h"
  35 #include "algorithm.h"
  36 #include "register.h"
  37
  38
  39 static const char *armv4_5_core_reg_list[] =
  40 {
  41         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  42         "r8", "r9", "r10", "r11", "r12", "r13_usr", "lr_usr", "pc",
  43
  44         "r8_fiq", "r9_fiq", "r10_fiq", "r11_fiq", "r12_fiq", "r13_fiq", "lr_fiq",
  45
  46         "r13_irq", "lr_irq",
  47
  48         "r13_svc", "lr_svc",
  49
  50         "r13_abt", "lr_abt",
  51
  52         "r13_und", "lr_und",
  53
  54         "cpsr", "spsr_fiq", "spsr_irq", "spsr_svc", "spsr_abt", "spsr_und",
  55
  56         "r13_mon", "lr_mon", "spsr_mon",
  57 };
  58
  59 static const struct {
  60         const char *name;
  61         unsigned psr;
  62 } arm_mode_data[] = {
  63         /* Seven modes are standard from ARM7 on. "System" and "User" share
  64          * the same registers; other modes shadow from 3 to 8 registers.
  65          */
  66         {
  67                 .name = "User",
  68                 .psr = ARMV4_5_MODE_USR,
  69         },
  70         {
  71                 .name = "FIQ",
  72                 .psr = ARMV4_5_MODE_FIQ,
  73         },
  74         {
  75                 .name = "Supervisor",
  76                 .psr = ARMV4_5_MODE_SVC,
  77         },
  78         {
  79                 .name = "Abort",
  80                 .psr = ARMV4_5_MODE_ABT,
  81         },
  82         {
  83                 .name = "IRQ",
  84                 .psr = ARMV4_5_MODE_IRQ,
  85         },
  86         {
  87                 .name = "Undefined" /* instruction */,
  88                 .psr = ARMV4_5_MODE_UND,
  89         },
  90         {
  91                 .name = "System",
  92                 .psr = ARMV4_5_MODE_SYS,
  93         },
  94         /* TrustZone "Security Extensions" add a secure monitor mode.
  95          * This is distinct from a "debug monitor" which can support
  96          * non-halting debug, in conjunction with some debuggers.
  97          */
  98         {
  99                 .name = "Secure Monitor",
 100                 .psr = ARM_MODE_MON,
 101         },
 102 };
 103
 104 /** Map PSR mode bits to the name of an ARM processor operating mode. */
 105 const char *arm_mode_name(unsigned psr_mode)
 106 {
 107         for (unsigned i = 0; i < ARRAY_SIZE(arm_mode_data); i++) {
 108                 if (arm_mode_data[i].psr == psr_mode)
 109                         return arm_mode_data[i].name;
 110         }
 111         LOG_ERROR("unrecognized psr mode: %#02x", psr_mode);
 112         return "UNRECOGNIZED";
 113 }
 114
 115 /** Return true iff the parameter denotes a valid ARM processor mode. */
 116 bool is_arm_mode(unsigned psr_mode)
 117 {
 118         for (unsigned i = 0; i < ARRAY_SIZE(arm_mode_data); i++) {
 119                 if (arm_mode_data[i].psr == psr_mode)
 120                         return true;
 121         }
 122         return false;
 123 }
 124
 125 /** Map PSR mode bits to linear number indexing armv4_5_core_reg_map */
 126 int armv4_5_mode_to_number(enum armv4_5_mode mode)
 127 {
 128         switch (mode) {
 129         case ARMV4_5_MODE_ANY:
 130                 /* map MODE_ANY to user mode */
 131         case ARMV4_5_MODE_USR:
 132                 return 0;
 133         case ARMV4_5_MODE_FIQ:
 134                 return 1;
 135         case ARMV4_5_MODE_IRQ:
 136                 return 2;
 137         case ARMV4_5_MODE_SVC:
 138                 return 3;
 139         case ARMV4_5_MODE_ABT:
 140                 return 4;
 141         case ARMV4_5_MODE_UND:
 142                 return 5;
 143         case ARMV4_5_MODE_SYS:
 144                 return 6;
 145         case ARM_MODE_MON:
 146                 return 7;
 147         default:
 148                 LOG_ERROR("invalid mode value encountered %d", mode);
 149                 return -1;
 150         }
 151 }
 152
 153 /** Map linear number indexing armv4_5_core_reg_map to PSR mode bits. */
 154 enum armv4_5_mode armv4_5_number_to_mode(int number)
 155 {
 156         switch (number) {
 157         case 0:
 158                 return ARMV4_5_MODE_USR;
 159         case 1:
 160                 return ARMV4_5_MODE_FIQ;
 161         case 2:
 162                 return ARMV4_5_MODE_IRQ;
 163         case 3:
 164                 return ARMV4_5_MODE_SVC;
 165         case 4:
 166                 return ARMV4_5_MODE_ABT;
 167         case 5:
 168                 return ARMV4_5_MODE_UND;
 169         case 6:
 170                 return ARMV4_5_MODE_SYS;
 171         case 7:
 172                 return ARM_MODE_MON;
 173         default:
 174                 LOG_ERROR("mode index out of bounds %d", number);
 175                 return ARMV4_5_MODE_ANY;
 176         }
 177 }
 178
 179 char* armv4_5_state_strings[] =
 180 {
 181         "ARM", "Thumb", "Jazelle"
 182 };
 183
 184 static const struct armv4_5_core_reg armv4_5_core_reg_list_arch_info[] =
 185 {
 186         {0, ARMV4_5_MODE_ANY, NULL, NULL},
 187         {1, ARMV4_5_MODE_ANY, NULL, NULL},
 188         {2, ARMV4_5_MODE_ANY, NULL, NULL},
 189         {3, ARMV4_5_MODE_ANY, NULL, NULL},
 190         {4, ARMV4_5_MODE_ANY, NULL, NULL},
 191         {5, ARMV4_5_MODE_ANY, NULL, NULL},
 192         {6, ARMV4_5_MODE_ANY, NULL, NULL},
 193         {7, ARMV4_5_MODE_ANY, NULL, NULL},
 194         {8, ARMV4_5_MODE_ANY, NULL, NULL},
 195         {9, ARMV4_5_MODE_ANY, NULL, NULL},
 196         {10, ARMV4_5_MODE_ANY, NULL, NULL},
 197         {11, ARMV4_5_MODE_ANY, NULL, NULL},
 198         {12, ARMV4_5_MODE_ANY, NULL, NULL},
 199         {13, ARMV4_5_MODE_USR, NULL, NULL},
 200         {14, ARMV4_5_MODE_USR, NULL, NULL},
 201         {15, ARMV4_5_MODE_ANY, NULL, NULL},
 202
 203         {8, ARMV4_5_MODE_FIQ, NULL, NULL},
 204         {9, ARMV4_5_MODE_FIQ, NULL, NULL},
 205         {10, ARMV4_5_MODE_FIQ, NULL, NULL},
 206         {11, ARMV4_5_MODE_FIQ, NULL, NULL},
 207         {12, ARMV4_5_MODE_FIQ, NULL, NULL},
 208         {13, ARMV4_5_MODE_FIQ, NULL, NULL},
 209         {14, ARMV4_5_MODE_FIQ, NULL, NULL},
 210
 211         {13, ARMV4_5_MODE_IRQ, NULL, NULL},
 212         {14, ARMV4_5_MODE_IRQ, NULL, NULL},
 213
 214         {13, ARMV4_5_MODE_SVC, NULL, NULL},
 215         {14, ARMV4_5_MODE_SVC, NULL, NULL},
 216
 217         {13, ARMV4_5_MODE_ABT, NULL, NULL},
 218         {14, ARMV4_5_MODE_ABT, NULL, NULL},
 219
 220         {13, ARMV4_5_MODE_UND, NULL, NULL},
 221         {14, ARMV4_5_MODE_UND, NULL, NULL},
 222
 223         {16, ARMV4_5_MODE_ANY, NULL, NULL},
 224         {16, ARMV4_5_MODE_FIQ, NULL, NULL},
 225         {16, ARMV4_5_MODE_IRQ, NULL, NULL},
 226         {16, ARMV4_5_MODE_SVC, NULL, NULL},
 227         {16, ARMV4_5_MODE_ABT, NULL, NULL},
 228         {16, ARMV4_5_MODE_UND, NULL, NULL},
 229
 230         {13, ARM_MODE_MON, NULL, NULL},
 231         {14, ARM_MODE_MON, NULL, NULL},
 232         {16, ARM_MODE_MON, NULL, NULL},
 233 };
 234
 235 /* map core mode (USR, FIQ, ...) and register number to indizes into the register cache */
 236 const int armv4_5_core_reg_map[8][17] =
 237 {
 238         {       /* USR */
 239                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 240         },
 241         {       /* FIQ (8 shadows of USR, vs normal 3) */
 242                 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 15, 32
 243         },
 244         {       /* IRQ */
 245                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24, 15, 33
 246         },
 247         {       /* SVC */
 248                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26, 15, 34
 249         },
 250         {       /* ABT */
 251                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27, 28, 15, 35
 252         },
 253         {       /* UND */
 254                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29, 30, 15, 36
 255         },
 256         {       /* SYS (same registers as USR) */
 257                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 258         },
 259         {       /* MON */
 260                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 37, 38, 15, 39,
 261         }
 262 };
 263
 264 static const uint8_t arm_gdb_dummy_fp_value[12];
 265
 266 /**
 267  * Dummy FPA registers are required to support GDB on ARM.
 268  * Register packets require eight obsolete FPA register values.
 269  * Modern ARM cores use Vector Floating Point (VFP), if they
 270  * have any floating point support.  VFP is not FPA-compatible.
 271  */
 272 struct reg arm_gdb_dummy_fp_reg =
 273 {
 274         .name = "GDB dummy FPA register",
 275         .value = (uint8_t *) arm_gdb_dummy_fp_value,
 276         .valid = 1,
 277         .size = 96,
 278 };
 279
 280 static const uint8_t arm_gdb_dummy_fps_value[4];
 281
 282 /**
 283  * Dummy FPA status registers are required to support GDB on ARM.
 284  * Register packets require an obsolete FPA status register.
 285  */
 286 struct reg arm_gdb_dummy_fps_reg =
 287 {
 288         .name = "GDB dummy FPA status register",
 289         .value = (uint8_t *) arm_gdb_dummy_fps_value,
 290         .valid = 1,
 291         .size = 32,
 292 };
 293
 294 static void arm_gdb_dummy_init(void) __attribute__ ((constructor));
 295
 296 static void arm_gdb_dummy_init(void)
 297 {
 298         register_init_dummy(&arm_gdb_dummy_fp_reg);
 299         register_init_dummy(&arm_gdb_dummy_fps_reg);
 300 }
 301
 302 static int armv4_5_get_core_reg(struct reg *reg)
 303 {
 304         int retval;
 305         struct armv4_5_core_reg *armv4_5 = reg->arch_info;
 306         struct target *target = armv4_5->target;
 307
 308         if (target->state != TARGET_HALTED)
 309         {
 310                 LOG_ERROR("Target not halted");
 311                 return ERROR_TARGET_NOT_HALTED;
 312         }
 313
 314         retval = armv4_5->armv4_5_common->read_core_reg(target, armv4_5->num, armv4_5->mode);
 315         if (retval == ERROR_OK)
 316                 reg->valid = 1;
 317
 318         return retval;
 319 }
 320
 321 static int armv4_5_set_core_reg(struct reg *reg, uint8_t *buf)
 322 {
 323         struct armv4_5_core_reg *armv4_5 = reg->arch_info;
 324         struct target *target = armv4_5->target;
 325         struct armv4_5_common_s *armv4_5_target = target_to_armv4_5(target);
 326         uint32_t value = buf_get_u32(buf, 0, 32);
 327
 328         if (target->state != TARGET_HALTED)
 329         {
 330                 LOG_ERROR("Target not halted");
 331                 return ERROR_TARGET_NOT_HALTED;
 332         }
 333
 334         if (reg == &armv4_5_target->core_cache->reg_list[ARMV4_5_CPSR])
 335         {
 336                 if (value & 0x20)
 337                 {
 338                         /* T bit should be set */
 339                         if (armv4_5_target->core_state == ARMV4_5_STATE_ARM)
 340                         {
 341                                 /* change state to Thumb */
 342                                 LOG_DEBUG("changing to Thumb state");
 343                                 armv4_5_target->core_state = ARMV4_5_STATE_THUMB;
 344                         }
 345                 }
 346                 else
 347                 {
 348                         /* T bit should be cleared */
 349                         if (armv4_5_target->core_state == ARMV4_5_STATE_THUMB)
 350                         {
 351                                 /* change state to ARM */
 352                                 LOG_DEBUG("changing to ARM state");
 353                                 armv4_5_target->core_state = ARMV4_5_STATE_ARM;
 354                         }
 355                 }
 356
 357                 if (armv4_5_target->core_mode != (enum armv4_5_mode)(value & 0x1f))
 358                 {
 359                         LOG_DEBUG("changing ARM core mode to '%s'",
 360                                         arm_mode_name(value & 0x1f));
 361                         armv4_5_target->core_mode = value & 0x1f;
 362                         armv4_5_target->write_core_reg(target, 16, ARMV4_5_MODE_ANY, value);
 363                 }
 364         }
 365
 366         buf_set_u32(reg->value, 0, 32, value);
 367         reg->dirty = 1;
 368         reg->valid = 1;
 369
 370         return ERROR_OK;
 371 }
 372
 373 static const struct reg_arch_type arm_reg_type = {
 374         .get = armv4_5_get_core_reg,
 375         .set = armv4_5_set_core_reg,
 376 };
 377
 378 /** Marks the contents of the register cache as invalid (and clean). */
 379 int armv4_5_invalidate_core_regs(struct target *target)
 380 {
 381         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 382         unsigned num_regs = armv4_5->core_cache->num_regs;
 383         struct reg *reg = armv4_5->core_cache->reg_list;
 384
 385         for (unsigned i = 0; i < num_regs; i++, reg++) {
 386                 reg->valid = 0;
 387                 reg->dirty = 0;
 388         }
 389
 390         /* FIXME don't bother returning a value then */
 391         return ERROR_OK;
 392 }
 393
 394 struct reg_cache* armv4_5_build_reg_cache(struct target *target, struct arm *armv4_5_common)
 395 {
 396         int num_regs = ARRAY_SIZE(armv4_5_core_reg_list_arch_info);
 397         struct reg_cache *cache = malloc(sizeof(struct reg_cache));
 398         struct reg *reg_list = calloc(num_regs, sizeof(struct reg));
 399         struct armv4_5_core_reg *arch_info = calloc(num_regs,
 400                                         sizeof(struct armv4_5_core_reg));
 401         int i;
 402
 403         if (!cache || !reg_list || !arch_info) {
 404                 free(cache);
 405                 free(reg_list);
 406                 free(arch_info);
 407                 return NULL;
 408         }
 409
 410         cache->name = "ARM registers";
 411         cache->next = NULL;
 412         cache->reg_list = reg_list;
 413         cache->num_regs = 0;
 414
 415         for (i = 0; i < num_regs; i++)
 416         {
 417                 /* Skip registers this core doesn't expose */
 418                 if (armv4_5_core_reg_list_arch_info[i].mode == ARM_MODE_MON
 419                                 && armv4_5_common->core_type != ARM_MODE_MON)
 420                         continue;
 421
 422                 /* REVISIT handle Cortex-M, which only shadows R13/SP */
 423
 424                 arch_info[i] = armv4_5_core_reg_list_arch_info[i];
 425                 arch_info[i].target = target;
 426                 arch_info[i].armv4_5_common = armv4_5_common;
 427                 reg_list[i].name = (char *) armv4_5_core_reg_list[i];
 428                 reg_list[i].size = 32;
 429                 reg_list[i].value = calloc(1, 4);
 430                 reg_list[i].type = &arm_reg_type;
 431                 reg_list[i].arch_info = &arch_info[i];
 432
 433                 cache->num_regs++;
 434         }
 435
 436         return cache;
 437 }
 438
 439 int armv4_5_arch_state(struct target *target)
 440 {
 441         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 442
 443         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 444         {
 445                 LOG_ERROR("BUG: called for a non-ARMv4/5 target");
 446                 return ERROR_FAIL;
 447         }
 448
 449         LOG_USER("target halted in %s state due to %s, current mode: %s\ncpsr: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "",
 450                          armv4_5_state_strings[armv4_5->core_state],
 451                          Jim_Nvp_value2name_simple(nvp_target_debug_reason, target->debug_reason)->name,
 452                          arm_mode_name(armv4_5->core_mode),
 453                          buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32),
 454                          buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
 455
 456         return ERROR_OK;
 457 }
 458
 459 #define ARMV4_5_CORE_REG_MODENUM(cache, mode, num) \
 460                 cache->reg_list[armv4_5_core_reg_map[mode][num]]
 461
 462 COMMAND_HANDLER(handle_armv4_5_reg_command)
 463 {
 464         char output[128];
 465         int output_len;
 466         int mode, num;
 467         struct target *target = get_current_target(CMD_CTX);
 468         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 469
 470         if (!is_arm(armv4_5))
 471         {
 472                 command_print(CMD_CTX, "current target isn't an ARM");
 473                 return ERROR_FAIL;
 474         }
 475
 476         if (target->state != TARGET_HALTED)
 477         {
 478                 command_print(CMD_CTX, "error: target must be halted for register accesses");
 479                 return ERROR_OK;
 480         }
 481
 482         if (!is_arm_mode(armv4_5->core_mode))
 483                 return ERROR_FAIL;
 484
 485         if (!armv4_5->full_context) {
 486                 command_print(CMD_CTX, "error: target doesn't support %s",
 487                                 CMD_NAME);
 488                 return ERROR_FAIL;
 489         }
 490
 491         for (num = 0; num <= 15; num++)
 492         {
 493                 output_len = 0;
 494                 for (mode = 0; mode < 6; mode++)
 495                 {
 496                         if (!ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).valid)
 497                         {
 498                                 armv4_5->full_context(target);
 499                         }
 500                         output_len += snprintf(output + output_len,
 501                                                128 - output_len,
 502                                                "%8s: %8.8" PRIx32 " ",
 503                                                ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).name,
 504                                                buf_get_u32(ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).value, 0, 32));
 505                 }
 506                 command_print(CMD_CTX, "%s", output);
 507         }
 508         command_print(CMD_CTX,
 509                       "    cpsr: %8.8" PRIx32 " spsr_fiq: %8.8" PRIx32 " spsr_irq: %8.8" PRIx32 " spsr_svc: %8.8" PRIx32 " spsr_abt: %8.8" PRIx32 " spsr_und: %8.8" PRIx32 "",
 510                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32),
 511                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_FIQ].value, 0, 32),
 512                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_IRQ].value, 0, 32),
 513                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_SVC].value, 0, 32),
 514                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_ABT].value, 0, 32),
 515                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_UND].value, 0, 32));
 516
 517         return ERROR_OK;
 518 }
 519
 520 COMMAND_HANDLER(handle_armv4_5_core_state_command)
 521 {
 522         struct target *target = get_current_target(CMD_CTX);
 523         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 524
 525         if (!is_arm(armv4_5))
 526         {
 527                 command_print(CMD_CTX, "current target isn't an ARM");
 528                 return ERROR_FAIL;
 529         }
 530
 531         if (CMD_ARGC > 0)
 532         {
 533                 if (strcmp(CMD_ARGV[0], "arm") == 0)
 534                 {
 535                         armv4_5->core_state = ARMV4_5_STATE_ARM;
 536                 }
 537                 if (strcmp(CMD_ARGV[0], "thumb") == 0)
 538                 {
 539                         armv4_5->core_state = ARMV4_5_STATE_THUMB;
 540                 }
 541         }
 542
 543         command_print(CMD_CTX, "core state: %s", armv4_5_state_strings[armv4_5->core_state]);
 544
 545         return ERROR_OK;
 546 }
 547
 548 COMMAND_HANDLER(handle_armv4_5_disassemble_command)
 549 {
 550         int retval = ERROR_OK;
 551         struct target *target = get_current_target(CMD_CTX);
 552         struct arm *arm = target ? target_to_arm(target) : NULL;
 553         uint32_t address;
 554         int count = 1;
 555         int thumb = 0;
 556
 557         if (!is_arm(arm)) {
 558                 command_print(CMD_CTX, "current target isn't an ARM");
 559                 return ERROR_FAIL;
 560         }
 561
 562         switch (CMD_ARGC) {
 563         case 3:
 564                 if (strcmp(CMD_ARGV[2], "thumb") != 0)
 565                         goto usage;
 566                 thumb = 1;
 567                 /* FALL THROUGH */
 568         case 2:
 569                 COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], count);
 570                 /* FALL THROUGH */
 571         case 1:
 572                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], address);
 573                 if (address & 0x01) {
 574                         if (!thumb) {
 575                                 command_print(CMD_CTX, "Disassemble as Thumb");
 576                                 thumb = 1;
 577                         }
 578                         address &= ~1;
 579                 }
 580                 break;
 581         default:
 582 usage:
 583                 command_print(CMD_CTX,
 584                         "usage: arm disassemble <address> [<count> ['thumb']]");
 585                 count = 0;
 586                 retval = ERROR_FAIL;
 587         }
 588
 589         while (count-- > 0) {
 590                 struct arm_instruction cur_instruction;
 591
 592                 if (thumb) {
 593                         /* Always use Thumb2 disassembly for best handling
 594                          * of 32-bit BL/BLX, and to work with newer cores
 595                          * (some ARMv6, all ARMv7) that use Thumb2.
 596                          */
 597                         retval = thumb2_opcode(target, address,
 598                                         &cur_instruction);
 599                         if (retval != ERROR_OK)
 600                                 break;
 601                 } else {
 602                         uint32_t opcode;
 603
 604                         retval = target_read_u32(target, address, &opcode);
 605                         if (retval != ERROR_OK)
 606                                 break;
 607                         retval = arm_evaluate_opcode(opcode, address,
 608                                         &cur_instruction) != ERROR_OK;
 609                         if (retval != ERROR_OK)
 610                                 break;
 611                 }
 612                 command_print(CMD_CTX, "%s", cur_instruction.text);
 613                 address += cur_instruction.instruction_size;
 614         }
 615
 616         return retval;
 617 }
 618
 619 int armv4_5_register_commands(struct command_context *cmd_ctx)
 620 {
 621         struct command *armv4_5_cmd;
 622
 623         armv4_5_cmd = register_command(cmd_ctx, NULL, "arm",
 624                         NULL, COMMAND_ANY,
 625                         "generic ARM commands");
 626
 627         register_command(cmd_ctx, armv4_5_cmd, "reg",
 628                         handle_armv4_5_reg_command, COMMAND_EXEC,
 629                         "display ARM core registers");
 630         register_command(cmd_ctx, armv4_5_cmd, "core_state",
 631                         handle_armv4_5_core_state_command, COMMAND_EXEC,
 632                         "display/change ARM core state <arm | thumb>");
 633         register_command(cmd_ctx, armv4_5_cmd, "disassemble",
 634                         handle_armv4_5_disassemble_command, COMMAND_EXEC,
 635                         "disassemble instructions "
 636                                 "<address> [<count> ['thumb']]");
 637
 638         return ERROR_OK;
 639 }
 640
 641 int armv4_5_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int *reg_list_size)
 642 {
 643         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 644         int i;
 645
 646         if (!is_arm_mode(armv4_5->core_mode))
 647                 return ERROR_FAIL;
 648
 649         *reg_list_size = 26;
 650         *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
 651
 652         for (i = 0; i < 16; i++)
 653         {
 654                 (*reg_list)[i] = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i);
 655         }
 656
 657         for (i = 16; i < 24; i++)
 658         {
 659                 (*reg_list)[i] = &arm_gdb_dummy_fp_reg;
 660         }
 661
 662         (*reg_list)[24] = &arm_gdb_dummy_fps_reg;
 663         (*reg_list)[25] = &armv4_5->core_cache->reg_list[ARMV4_5_CPSR];
 664
 665         return ERROR_OK;
 666 }
 667
 668 /* wait for execution to complete and check exit point */
 669 static int armv4_5_run_algorithm_completion(struct target *target, uint32_t exit_point, int timeout_ms, void *arch_info)
 670 {
 671         int retval;
 672         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 673
 674         if ((retval = target_wait_state(target, TARGET_HALTED, timeout_ms)) != ERROR_OK)
 675         {
 676                 return retval;
 677         }
 678         if (target->state != TARGET_HALTED)
 679         {
 680                 if ((retval = target_halt(target)) != ERROR_OK)
 681                         return retval;
 682                 if ((retval = target_wait_state(target, TARGET_HALTED, 500)) != ERROR_OK)
 683                 {
 684                         return retval;
 685                 }
 686                 return ERROR_TARGET_TIMEOUT;
 687         }
 688
 689         /* fast exit: ARMv5+ code can use BKPT */
 690         if (exit_point && buf_get_u32(armv4_5->core_cache->reg_list[15].value,
 691                                 0, 32) != exit_point)
 692         {
 693                 LOG_WARNING("target reentered debug state, but not at the desired exit point: 0x%4.4" PRIx32 "",
 694                         buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
 695                 return ERROR_TARGET_TIMEOUT;
 696         }
 697
 698         return ERROR_OK;
 699 }
 700
 701 int armv4_5_run_algorithm_inner(struct target *target, int num_mem_params, struct mem_param *mem_params, int num_reg_params, struct reg_param *reg_params, uint32_t entry_point, uint32_t exit_point, int timeout_ms, void *arch_info, int (*run_it)(struct target *target, uint32_t exit_point, int timeout_ms, void *arch_info))
 702 {
 703         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 704         struct armv4_5_algorithm *armv4_5_algorithm_info = arch_info;
 705         enum armv4_5_state core_state = armv4_5->core_state;
 706         enum armv4_5_mode core_mode = armv4_5->core_mode;
 707         uint32_t context[17];
 708         uint32_t cpsr;
 709         int exit_breakpoint_size = 0;
 710         int i;
 711         int retval = ERROR_OK;
 712         LOG_DEBUG("Running algorithm");
 713
 714         if (armv4_5_algorithm_info->common_magic != ARMV4_5_COMMON_MAGIC)
 715         {
 716                 LOG_ERROR("current target isn't an ARMV4/5 target");
 717                 return ERROR_TARGET_INVALID;
 718         }
 719
 720         if (target->state != TARGET_HALTED)
 721         {
 722                 LOG_WARNING("target not halted");
 723                 return ERROR_TARGET_NOT_HALTED;
 724         }
 725
 726         if (!is_arm_mode(armv4_5->core_mode))
 727                 return ERROR_FAIL;
 728
 729         /* armv5 and later can terminate with BKPT instruction; less overhead */
 730         if (!exit_point && armv4_5->is_armv4)
 731         {
 732                 LOG_ERROR("ARMv4 target needs HW breakpoint location");
 733                 return ERROR_FAIL;
 734         }
 735
 736         for (i = 0; i <= 16; i++)
 737         {
 738                 if (!ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).valid)
 739                         armv4_5->read_core_reg(target, i, armv4_5_algorithm_info->core_mode);
 740                 context[i] = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32);
 741         }
 742         cpsr = buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32);
 743
 744         for (i = 0; i < num_mem_params; i++)
 745         {
 746                 if ((retval = target_write_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
 747                 {
 748                         return retval;
 749                 }
 750         }
 751
 752         for (i = 0; i < num_reg_params; i++)
 753         {
 754                 struct reg *reg = register_get_by_name(armv4_5->core_cache, reg_params[i].reg_name, 0);
 755                 if (!reg)
 756                 {
 757                         LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 758                         return ERROR_INVALID_ARGUMENTS;
 759                 }
 760
 761                 if (reg->size != reg_params[i].size)
 762                 {
 763                         LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
 764                         return ERROR_INVALID_ARGUMENTS;
 765                 }
 766
 767                 if ((retval = armv4_5_set_core_reg(reg, reg_params[i].value)) != ERROR_OK)
 768                 {
 769                         return retval;
 770                 }
 771         }
 772
 773         armv4_5->core_state = armv4_5_algorithm_info->core_state;
 774         if (armv4_5->core_state == ARMV4_5_STATE_ARM)
 775                 exit_breakpoint_size = 4;
 776         else if (armv4_5->core_state == ARMV4_5_STATE_THUMB)
 777                 exit_breakpoint_size = 2;
 778         else
 779         {
 780                 LOG_ERROR("BUG: can't execute algorithms when not in ARM or Thumb state");
 781                 return ERROR_INVALID_ARGUMENTS;
 782         }
 783
 784         if (armv4_5_algorithm_info->core_mode != ARMV4_5_MODE_ANY)
 785         {
 786                 LOG_DEBUG("setting core_mode: 0x%2.2x", armv4_5_algorithm_info->core_mode);
 787                 buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 5, armv4_5_algorithm_info->core_mode);
 788                 armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
 789                 armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
 790         }
 791
 792         /* terminate using a hardware or (ARMv5+) software breakpoint */
 793         if (exit_point && (retval = breakpoint_add(target, exit_point,
 794                                 exit_breakpoint_size, BKPT_HARD)) != ERROR_OK)
 795         {
 796                 LOG_ERROR("can't add HW breakpoint to terminate algorithm");
 797                 return ERROR_TARGET_FAILURE;
 798         }
 799
 800         if ((retval = target_resume(target, 0, entry_point, 1, 1)) != ERROR_OK)
 801         {
 802                 return retval;
 803         }
 804         int retvaltemp;
 805         retval = run_it(target, exit_point, timeout_ms, arch_info);
 806
 807         if (exit_point)
 808                 breakpoint_remove(target, exit_point);
 809
 810         if (retval != ERROR_OK)
 811                 return retval;
 812
 813         for (i = 0; i < num_mem_params; i++)
 814         {
 815                 if (mem_params[i].direction != PARAM_OUT)
 816                         if ((retvaltemp = target_read_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
 817                         {
 818                                         retval = retvaltemp;
 819                         }
 820         }
 821
 822         for (i = 0; i < num_reg_params; i++)
 823         {
 824                 if (reg_params[i].direction != PARAM_OUT)
 825                 {
 826
 827                         struct reg *reg = register_get_by_name(armv4_5->core_cache, reg_params[i].reg_name, 0);
 828                         if (!reg)
 829                         {
 830                                 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 831                                 retval = ERROR_INVALID_ARGUMENTS;
 832                                 continue;
 833                         }
 834
 835                         if (reg->size != reg_params[i].size)
 836                         {
 837                                 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
 838                                 retval = ERROR_INVALID_ARGUMENTS;
 839                                 continue;
 840                         }
 841
 842                         buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
 843                 }
 844         }
 845
 846         for (i = 0; i <= 16; i++)
 847         {
 848                 uint32_t regvalue;
 849                 regvalue = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32);
 850                 if (regvalue != context[i])
 851                 {
 852                         LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32 "", ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).name, context[i]);
 853                         buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32, context[i]);
 854                         ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).valid = 1;
 855                         ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).dirty = 1;
 856                 }
 857         }
 858         buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32, cpsr);
 859         armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
 860         armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
 861
 862         armv4_5->core_state = core_state;
 863         armv4_5->core_mode = core_mode;
 864
 865         return retval;
 866 }
 867
 868 int armv4_5_run_algorithm(struct target *target, int num_mem_params, struct mem_param *mem_params, int num_reg_params, struct reg_param *reg_params, uint32_t entry_point, uint32_t exit_point, int timeout_ms, void *arch_info)
 869 {
 870         return armv4_5_run_algorithm_inner(target, num_mem_params, mem_params, num_reg_params, reg_params, entry_point, exit_point, timeout_ms, arch_info, armv4_5_run_algorithm_completion);
 871 }
 872
 873 /**
 874  * Runs ARM code in the target to calculate a CRC32 checksum.
 875  *
 876  * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
 877  */
 878 int arm_checksum_memory(struct target *target,
 879                 uint32_t address, uint32_t count, uint32_t *checksum)
 880 {
 881         struct working_area *crc_algorithm;
 882         struct armv4_5_algorithm armv4_5_info;
 883         struct reg_param reg_params[2];
 884         int retval;
 885         uint32_t i;
 886
 887         static const uint32_t arm_crc_code[] = {
 888                 0xE1A02000,             /* mov          r2, r0 */
 889                 0xE3E00000,             /* mov          r0, #0xffffffff */
 890                 0xE1A03001,             /* mov          r3, r1 */
 891                 0xE3A04000,             /* mov          r4, #0 */
 892                 0xEA00000B,             /* b            ncomp */
 893                 /* nbyte: */
 894                 0xE7D21004,             /* ldrb r1, [r2, r4] */
 895                 0xE59F7030,             /* ldr          r7, CRC32XOR */
 896                 0xE0200C01,             /* eor          r0, r0, r1, asl 24 */
 897                 0xE3A05000,             /* mov          r5, #0 */
 898                 /* loop: */
 899                 0xE3500000,             /* cmp          r0, #0 */
 900                 0xE1A06080,             /* mov          r6, r0, asl #1 */
 901                 0xE2855001,             /* add          r5, r5, #1 */
 902                 0xE1A00006,             /* mov          r0, r6 */
 903                 0xB0260007,             /* eorlt        r0, r6, r7 */
 904                 0xE3550008,             /* cmp          r5, #8 */
 905                 0x1AFFFFF8,             /* bne          loop */
 906                 0xE2844001,             /* add          r4, r4, #1 */
 907                 /* ncomp: */
 908                 0xE1540003,             /* cmp          r4, r3 */
 909                 0x1AFFFFF1,             /* bne          nbyte */
 910                 /* end: */
 911                 0xEAFFFFFE,             /* b            end */
 912                 /* CRC32XOR: */
 913                 0x04C11DB7              /* .word 0x04C11DB7 */
 914         };
 915
 916         retval = target_alloc_working_area(target,
 917                         sizeof(arm_crc_code), &crc_algorithm);
 918         if (retval != ERROR_OK)
 919                 return retval;
 920
 921         /* convert code into a buffer in target endianness */
 922         for (i = 0; i < ARRAY_SIZE(arm_crc_code); i++) {
 923                 retval = target_write_u32(target,
 924                                 crc_algorithm->address + i * sizeof(uint32_t),
 925                                 arm_crc_code[i]);
 926                 if (retval != ERROR_OK)
 927                         return retval;
 928         }
 929
 930         armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
 931         armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
 932         armv4_5_info.core_state = ARMV4_5_STATE_ARM;
 933
 934         init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
 935         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
 936
 937         buf_set_u32(reg_params[0].value, 0, 32, address);
 938         buf_set_u32(reg_params[1].value, 0, 32, count);
 939
 940         /* 20 second timeout/megabyte */
 941         int timeout = 20000 * (1 + (count / (1024 * 1024)));
 942
 943         retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
 944                         crc_algorithm->address,
 945                         crc_algorithm->address + sizeof(arm_crc_code) - 8,
 946                         timeout, &armv4_5_info);
 947         if (retval != ERROR_OK) {
 948                 LOG_ERROR("error executing ARM crc algorithm");
 949                 destroy_reg_param(&reg_params[0]);
 950                 destroy_reg_param(&reg_params[1]);
 951                 target_free_working_area(target, crc_algorithm);
 952                 return retval;
 953         }
 954
 955         *checksum = buf_get_u32(reg_params[0].value, 0, 32);
 956
 957         destroy_reg_param(&reg_params[0]);
 958         destroy_reg_param(&reg_params[1]);
 959
 960         target_free_working_area(target, crc_algorithm);
 961
 962         return ERROR_OK;
 963 }
 964
 965 /**
 966  * Runs ARM code in the target to check whether a memory block holds
 967  * all ones.  NOR flash which has been erased, and thus may be written,
 968  * holds all ones.
 969  *
 970  * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
 971  */
 972 int arm_blank_check_memory(struct target *target,
 973                 uint32_t address, uint32_t count, uint32_t *blank)
 974 {
 975         struct working_area *check_algorithm;
 976         struct reg_param reg_params[3];
 977         struct armv4_5_algorithm armv4_5_info;
 978         int retval;
 979         uint32_t i;
 980
 981         static const uint32_t check_code[] = {
 982                 /* loop: */
 983                 0xe4d03001,             /* ldrb r3, [r0], #1 */
 984                 0xe0022003,             /* and r2, r2, r3    */
 985                 0xe2511001,             /* subs r1, r1, #1   */
 986                 0x1afffffb,             /* bne loop          */
 987                 /* end: */
 988                 0xeafffffe              /* b end             */
 989         };
 990
 991         /* make sure we have a working area */
 992         retval = target_alloc_working_area(target,
 993                         sizeof(check_code), &check_algorithm);
 994         if (retval != ERROR_OK)
 995                 return retval;
 996
 997         /* convert code into a buffer in target endianness */
 998         for (i = 0; i < ARRAY_SIZE(check_code); i++) {
 999                 retval = target_write_u32(target,
1000                                 check_algorithm->address
1001                                                 + i * sizeof(uint32_t),
1002                                 check_code[i]);
1003                 if (retval != ERROR_OK)
1004                         return retval;
1005         }
1006
1007         armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
1008         armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
1009         armv4_5_info.core_state = ARMV4_5_STATE_ARM;
1010
1011         init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
1012         buf_set_u32(reg_params[0].value, 0, 32, address);
1013
1014         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
1015         buf_set_u32(reg_params[1].value, 0, 32, count);
1016
1017         init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
1018         buf_set_u32(reg_params[2].value, 0, 32, 0xff);
1019
1020         retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
1021                         check_algorithm->address,
1022                         check_algorithm->address + sizeof(check_code) - 4,
1023                         10000, &armv4_5_info);
1024         if (retval != ERROR_OK) {
1025                 destroy_reg_param(&reg_params[0]);
1026                 destroy_reg_param(&reg_params[1]);
1027                 destroy_reg_param(&reg_params[2]);
1028                 target_free_working_area(target, check_algorithm);
1029                 return retval;
1030         }
1031
1032         *blank = buf_get_u32(reg_params[2].value, 0, 32);
1033
1034         destroy_reg_param(&reg_params[0]);
1035         destroy_reg_param(&reg_params[1]);
1036         destroy_reg_param(&reg_params[2]);
1037
1038         target_free_working_area(target, check_algorithm);
1039
1040         return ERROR_OK;
1041 }
1042
1043 static int arm_full_context(struct target *target)
1044 {
1045         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
1046         unsigned num_regs = armv4_5->core_cache->num_regs;
1047         struct reg *reg = armv4_5->core_cache->reg_list;
1048         int retval = ERROR_OK;
1049
1050         for (; num_regs && retval == ERROR_OK; num_regs--, reg++) {
1051                 if (reg->valid)
1052                         continue;
1053                 retval = armv4_5_get_core_reg(reg);
1054         }
1055         return retval;
1056 }
1057
1058 int armv4_5_init_arch_info(struct target *target, struct arm *armv4_5)
1059 {
1060         target->arch_info = armv4_5;
1061
1062         armv4_5->common_magic = ARMV4_5_COMMON_MAGIC;
1063         armv4_5->core_state = ARMV4_5_STATE_ARM;
1064         armv4_5->core_mode = ARMV4_5_MODE_USR;
1065
1066         /* core_type may be overridden by subtype logic */
1067         armv4_5->core_type = ARMV4_5_MODE_ANY;
1068
1069         /* default full_context() has no core-specific optimizations */
1070         if (!armv4_5->full_context && armv4_5->read_core_reg)
1071                 armv4_5->full_context = arm_full_context;
1072
1073         return ERROR_OK;
1074 }