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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 char* armv4_5_core_reg_list[] =
  40 {
  41         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13_usr", "lr_usr", "pc",
  42
  43         "r8_fiq", "r9_fiq", "r10_fiq", "r11_fiq", "r12_fiq", "r13_fiq", "lr_fiq",
  44
  45         "r13_irq", "lr_irq",
  46
  47         "r13_svc", "lr_svc",
  48
  49         "r13_abt", "lr_abt",
  50
  51         "r13_und", "lr_und",
  52
  53         "cpsr", "spsr_fiq", "spsr_irq", "spsr_svc", "spsr_abt", "spsr_und"
  54 };
  55
  56 static const char *armv4_5_mode_strings_list[] =
  57 {
  58         "Illegal mode value", "User", "FIQ", "IRQ", "Supervisor", "Abort", "Undefined", "System"
  59 };
  60
  61 /* Hack! Yuk! allow -1 index, which simplifies codepaths elsewhere in the code */
  62 const char **armv4_5_mode_strings = armv4_5_mode_strings_list + 1;
  63
  64 /** Map PSR mode bits to linear number */
  65 int armv4_5_mode_to_number(enum armv4_5_mode mode)
  66 {
  67         switch (mode) {
  68         case ARMV4_5_MODE_ANY:
  69                 /* map MODE_ANY to user mode */
  70         case ARMV4_5_MODE_USR:
  71                 return 0;
  72         case ARMV4_5_MODE_FIQ:
  73                 return 1;
  74         case ARMV4_5_MODE_IRQ:
  75                 return 2;
  76         case ARMV4_5_MODE_SVC:
  77                 return 3;
  78         case ARMV4_5_MODE_ABT:
  79                 return 4;
  80         case ARMV4_5_MODE_UND:
  81                 return 5;
  82         case ARMV4_5_MODE_SYS:
  83                 return 6;
  84         default:
  85                 LOG_ERROR("invalid mode value encountered %d", mode);
  86                 return -1;
  87         }
  88 }
  89
  90 /** Map linear number to PSR mode bits. */
  91 enum armv4_5_mode armv4_5_number_to_mode(int number)
  92 {
  93         switch (number) {
  94         case 0:
  95                 return ARMV4_5_MODE_USR;
  96         case 1:
  97                 return ARMV4_5_MODE_FIQ;
  98         case 2:
  99                 return ARMV4_5_MODE_IRQ;
 100         case 3:
 101                 return ARMV4_5_MODE_SVC;
 102         case 4:
 103                 return ARMV4_5_MODE_ABT;
 104         case 5:
 105                 return ARMV4_5_MODE_UND;
 106         case 6:
 107                 return ARMV4_5_MODE_SYS;
 108         default:
 109                 LOG_ERROR("mode index out of bounds %d", number);
 110                 return ARMV4_5_MODE_ANY;
 111         }
 112 }
 113
 114 char* armv4_5_state_strings[] =
 115 {
 116         "ARM", "Thumb", "Jazelle"
 117 };
 118
 119 int armv4_5_core_reg_arch_type = -1;
 120
 121 struct armv4_5_core_reg armv4_5_core_reg_list_arch_info[] =
 122 {
 123         {0, ARMV4_5_MODE_ANY, NULL, NULL},
 124         {1, ARMV4_5_MODE_ANY, NULL, NULL},
 125         {2, ARMV4_5_MODE_ANY, NULL, NULL},
 126         {3, ARMV4_5_MODE_ANY, NULL, NULL},
 127         {4, ARMV4_5_MODE_ANY, NULL, NULL},
 128         {5, ARMV4_5_MODE_ANY, NULL, NULL},
 129         {6, ARMV4_5_MODE_ANY, NULL, NULL},
 130         {7, ARMV4_5_MODE_ANY, NULL, NULL},
 131         {8, ARMV4_5_MODE_ANY, NULL, NULL},
 132         {9, ARMV4_5_MODE_ANY, NULL, NULL},
 133         {10, ARMV4_5_MODE_ANY, NULL, NULL},
 134         {11, ARMV4_5_MODE_ANY, NULL, NULL},
 135         {12, ARMV4_5_MODE_ANY, NULL, NULL},
 136         {13, ARMV4_5_MODE_USR, NULL, NULL},
 137         {14, ARMV4_5_MODE_USR, NULL, NULL},
 138         {15, ARMV4_5_MODE_ANY, NULL, NULL},
 139
 140         {8, ARMV4_5_MODE_FIQ, NULL, NULL},
 141         {9, ARMV4_5_MODE_FIQ, NULL, NULL},
 142         {10, ARMV4_5_MODE_FIQ, NULL, NULL},
 143         {11, ARMV4_5_MODE_FIQ, NULL, NULL},
 144         {12, ARMV4_5_MODE_FIQ, NULL, NULL},
 145         {13, ARMV4_5_MODE_FIQ, NULL, NULL},
 146         {14, ARMV4_5_MODE_FIQ, NULL, NULL},
 147
 148         {13, ARMV4_5_MODE_IRQ, NULL, NULL},
 149         {14, ARMV4_5_MODE_IRQ, NULL, NULL},
 150
 151         {13, ARMV4_5_MODE_SVC, NULL, NULL},
 152         {14, ARMV4_5_MODE_SVC, NULL, NULL},
 153
 154         {13, ARMV4_5_MODE_ABT, NULL, NULL},
 155         {14, ARMV4_5_MODE_ABT, NULL, NULL},
 156
 157         {13, ARMV4_5_MODE_UND, NULL, NULL},
 158         {14, ARMV4_5_MODE_UND, NULL, NULL},
 159
 160         {16, ARMV4_5_MODE_ANY, NULL, NULL},
 161         {16, ARMV4_5_MODE_FIQ, NULL, NULL},
 162         {16, ARMV4_5_MODE_IRQ, NULL, NULL},
 163         {16, ARMV4_5_MODE_SVC, NULL, NULL},
 164         {16, ARMV4_5_MODE_ABT, NULL, NULL},
 165         {16, ARMV4_5_MODE_UND, NULL, NULL}
 166 };
 167
 168 /* map core mode (USR, FIQ, ...) and register number to indizes into the register cache */
 169 int armv4_5_core_reg_map[7][17] =
 170 {
 171         {       /* USR */
 172                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 173         },
 174         {       /* FIQ */
 175                 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 15, 32
 176         },
 177         {       /* IRQ */
 178                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24, 15, 33
 179         },
 180         {       /* SVC */
 181                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26, 15, 34
 182         },
 183         {       /* ABT */
 184                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27, 28, 15, 35
 185         },
 186         {       /* UND */
 187                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29, 30, 15, 36
 188         },
 189         {       /* SYS */
 190                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 191         }
 192 };
 193
 194 uint8_t armv4_5_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 195
 196 struct reg armv4_5_gdb_dummy_fp_reg =
 197 {
 198         .name = "GDB dummy floating-point register",
 199         .value = armv4_5_gdb_dummy_fp_value,
 200         .dirty = 0,
 201         .valid = 1,
 202         .size = 96,
 203         .arch_info = NULL,
 204         .arch_type = 0,
 205 };
 206
 207 uint8_t armv4_5_gdb_dummy_fps_value[] = {0, 0, 0, 0};
 208
 209 struct reg armv4_5_gdb_dummy_fps_reg =
 210 {
 211         .name = "GDB dummy floating-point status register",
 212         .value = armv4_5_gdb_dummy_fps_value,
 213         .dirty = 0,
 214         .valid = 1,
 215         .size = 32,
 216         .arch_info = NULL,
 217         .arch_type = 0,
 218 };
 219
 220 int armv4_5_get_core_reg(struct reg *reg)
 221 {
 222         int retval;
 223         struct armv4_5_core_reg *armv4_5 = reg->arch_info;
 224         struct target *target = armv4_5->target;
 225
 226         if (target->state != TARGET_HALTED)
 227         {
 228                 LOG_ERROR("Target not halted");
 229                 return ERROR_TARGET_NOT_HALTED;
 230         }
 231
 232         /* retval = armv4_5->armv4_5_common->full_context(target); */
 233         retval = armv4_5->armv4_5_common->read_core_reg(target, armv4_5->num, armv4_5->mode);
 234
 235         return retval;
 236 }
 237
 238 int armv4_5_set_core_reg(struct reg *reg, uint8_t *buf)
 239 {
 240         struct armv4_5_core_reg *armv4_5 = reg->arch_info;
 241         struct target *target = armv4_5->target;
 242         struct armv4_5_common_s *armv4_5_target = target_to_armv4_5(target);
 243         uint32_t value = buf_get_u32(buf, 0, 32);
 244
 245         if (target->state != TARGET_HALTED)
 246         {
 247                 return ERROR_TARGET_NOT_HALTED;
 248         }
 249
 250         if (reg == &armv4_5_target->core_cache->reg_list[ARMV4_5_CPSR])
 251         {
 252                 if (value & 0x20)
 253                 {
 254                         /* T bit should be set */
 255                         if (armv4_5_target->core_state == ARMV4_5_STATE_ARM)
 256                         {
 257                                 /* change state to Thumb */
 258                                 LOG_DEBUG("changing to Thumb state");
 259                                 armv4_5_target->core_state = ARMV4_5_STATE_THUMB;
 260                         }
 261                 }
 262                 else
 263                 {
 264                         /* T bit should be cleared */
 265                         if (armv4_5_target->core_state == ARMV4_5_STATE_THUMB)
 266                         {
 267                                 /* change state to ARM */
 268                                 LOG_DEBUG("changing to ARM state");
 269                                 armv4_5_target->core_state = ARMV4_5_STATE_ARM;
 270                         }
 271                 }
 272
 273                 if (armv4_5_target->core_mode != (enum armv4_5_mode)(value & 0x1f))
 274                 {
 275                         LOG_DEBUG("changing ARM core mode to '%s'", armv4_5_mode_strings[armv4_5_mode_to_number(value & 0x1f)]);
 276                         armv4_5_target->core_mode = value & 0x1f;
 277                         armv4_5_target->write_core_reg(target, 16, ARMV4_5_MODE_ANY, value);
 278                 }
 279         }
 280
 281         buf_set_u32(reg->value, 0, 32, value);
 282         reg->dirty = 1;
 283         reg->valid = 1;
 284
 285         return ERROR_OK;
 286 }
 287
 288 int armv4_5_invalidate_core_regs(struct target *target)
 289 {
 290         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 291         int i;
 292
 293         for (i = 0; i < 37; i++)
 294         {
 295                 armv4_5->core_cache->reg_list[i].valid = 0;
 296                 armv4_5->core_cache->reg_list[i].dirty = 0;
 297         }
 298
 299         return ERROR_OK;
 300 }
 301
 302 struct reg_cache* armv4_5_build_reg_cache(struct target *target, struct arm *armv4_5_common)
 303 {
 304         int num_regs = 37;
 305         struct reg_cache *cache = malloc(sizeof(struct reg_cache));
 306         struct reg *reg_list = malloc(sizeof(struct reg) * num_regs);
 307         struct armv4_5_core_reg *arch_info = malloc(sizeof(struct armv4_5_core_reg) * num_regs);
 308         int i;
 309
 310         cache->name = "arm v4/5 registers";
 311         cache->next = NULL;
 312         cache->reg_list = reg_list;
 313         cache->num_regs = num_regs;
 314
 315         if (armv4_5_core_reg_arch_type == -1)
 316                 armv4_5_core_reg_arch_type = register_reg_arch_type(armv4_5_get_core_reg, armv4_5_set_core_reg);
 317
 318         register_init_dummy(&armv4_5_gdb_dummy_fp_reg);
 319         register_init_dummy(&armv4_5_gdb_dummy_fps_reg);
 320
 321         for (i = 0; i < 37; i++)
 322         {
 323                 arch_info[i] = armv4_5_core_reg_list_arch_info[i];
 324                 arch_info[i].target = target;
 325                 arch_info[i].armv4_5_common = armv4_5_common;
 326                 reg_list[i].name = armv4_5_core_reg_list[i];
 327                 reg_list[i].size = 32;
 328                 reg_list[i].value = calloc(1, 4);
 329                 reg_list[i].dirty = 0;
 330                 reg_list[i].valid = 0;
 331                 reg_list[i].arch_type = armv4_5_core_reg_arch_type;
 332                 reg_list[i].arch_info = &arch_info[i];
 333         }
 334
 335         return cache;
 336 }
 337
 338 int armv4_5_arch_state(struct target *target)
 339 {
 340         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 341
 342         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 343         {
 344                 LOG_ERROR("BUG: called for a non-ARMv4/5 target");
 345                 exit(-1);
 346         }
 347
 348         LOG_USER("target halted in %s state due to %s, current mode: %s\ncpsr: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "",
 349                          armv4_5_state_strings[armv4_5->core_state],
 350                          Jim_Nvp_value2name_simple(nvp_target_debug_reason, target->debug_reason)->name,
 351                          armv4_5_mode_strings[armv4_5_mode_to_number(armv4_5->core_mode)],
 352                          buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32),
 353                          buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
 354
 355         return ERROR_OK;
 356 }
 357
 358 COMMAND_HANDLER(handle_armv4_5_reg_command)
 359 {
 360         char output[128];
 361         int output_len;
 362         int mode, num;
 363         struct target *target = get_current_target(cmd_ctx);
 364         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 365
 366         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 367         {
 368                 command_print(cmd_ctx, "current target isn't an ARMV4/5 target");
 369                 return ERROR_OK;
 370         }
 371
 372         if (target->state != TARGET_HALTED)
 373         {
 374                 command_print(cmd_ctx, "error: target must be halted for register accesses");
 375                 return ERROR_OK;
 376         }
 377
 378         if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
 379                 return ERROR_FAIL;
 380
 381         for (num = 0; num <= 15; num++)
 382         {
 383                 output_len = 0;
 384                 for (mode = 0; mode < 6; mode++)
 385                 {
 386                         if (!ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).valid)
 387                         {
 388                                 armv4_5->full_context(target);
 389                         }
 390                         output_len += snprintf(output + output_len,
 391                                                128 - output_len,
 392                                                "%8s: %8.8" PRIx32 " ",
 393                                                ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).name,
 394                                                buf_get_u32(ARMV4_5_CORE_REG_MODENUM(armv4_5->core_cache, mode, num).value, 0, 32));
 395                 }
 396                 command_print(cmd_ctx, "%s", output);
 397         }
 398         command_print(cmd_ctx,
 399                       "    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 "",
 400                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32),
 401                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_FIQ].value, 0, 32),
 402                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_IRQ].value, 0, 32),
 403                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_SVC].value, 0, 32),
 404                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_ABT].value, 0, 32),
 405                           buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_SPSR_UND].value, 0, 32));
 406
 407         return ERROR_OK;
 408 }
 409
 410 COMMAND_HANDLER(handle_armv4_5_core_state_command)
 411 {
 412         struct target *target = get_current_target(cmd_ctx);
 413         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 414
 415         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 416         {
 417                 command_print(cmd_ctx, "current target isn't an ARMV4/5 target");
 418                 return ERROR_OK;
 419         }
 420
 421         if (argc > 0)
 422         {
 423                 if (strcmp(args[0], "arm") == 0)
 424                 {
 425                         armv4_5->core_state = ARMV4_5_STATE_ARM;
 426                 }
 427                 if (strcmp(args[0], "thumb") == 0)
 428                 {
 429                         armv4_5->core_state = ARMV4_5_STATE_THUMB;
 430                 }
 431         }
 432
 433         command_print(cmd_ctx, "core state: %s", armv4_5_state_strings[armv4_5->core_state]);
 434
 435         return ERROR_OK;
 436 }
 437
 438 COMMAND_HANDLER(handle_armv4_5_disassemble_command)
 439 {
 440         int retval = ERROR_OK;
 441         struct target *target = get_current_target(cmd_ctx);
 442         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 443         uint32_t address;
 444         int count = 1;
 445         int i;
 446         struct arm_instruction cur_instruction;
 447         uint32_t opcode;
 448         uint16_t thumb_opcode;
 449         int thumb = 0;
 450
 451         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 452         {
 453                 command_print(cmd_ctx, "current target isn't an ARMV4/5 target");
 454                 return ERROR_OK;
 455         }
 456
 457         switch (argc) {
 458         case 3:
 459                 if (strcmp(args[2], "thumb") != 0)
 460                         goto usage;
 461                 thumb = 1;
 462                 /* FALL THROUGH */
 463         case 2:
 464                 COMMAND_PARSE_NUMBER(int, args[1], count);
 465                 /* FALL THROUGH */
 466         case 1:
 467                 COMMAND_PARSE_NUMBER(u32, args[0], address);
 468                 if (address & 0x01) {
 469                         if (!thumb) {
 470                                 command_print(cmd_ctx, "Disassemble as Thumb");
 471                                 thumb = 1;
 472                         }
 473                         address &= ~1;
 474                 }
 475                 break;
 476         default:
 477 usage:
 478                 command_print(cmd_ctx,
 479                         "usage: armv4_5 disassemble <address> [<count> ['thumb']]");
 480                 return ERROR_OK;
 481         }
 482
 483         for (i = 0; i < count; i++)
 484         {
 485                 if (thumb)
 486                 {
 487                         if ((retval = target_read_u16(target, address, &thumb_opcode)) != ERROR_OK)
 488                         {
 489                                 return retval;
 490                         }
 491                         if ((retval = thumb_evaluate_opcode(thumb_opcode, address, &cur_instruction)) != ERROR_OK)
 492                         {
 493                                 return retval;
 494                         }
 495                 }
 496                 else {
 497                         if ((retval = target_read_u32(target, address, &opcode)) != ERROR_OK)
 498                         {
 499                                 return retval;
 500                         }
 501                         if ((retval = arm_evaluate_opcode(opcode, address, &cur_instruction)) != ERROR_OK)
 502                         {
 503                                 return retval;
 504                         }
 505                 }
 506                 command_print(cmd_ctx, "%s", cur_instruction.text);
 507                 address += (thumb) ? 2 : 4;
 508         }
 509
 510         return ERROR_OK;
 511 }
 512
 513 int armv4_5_register_commands(struct command_context *cmd_ctx)
 514 {
 515         struct command *armv4_5_cmd;
 516
 517         armv4_5_cmd = register_command(cmd_ctx, NULL, "armv4_5",
 518                         NULL, COMMAND_ANY,
 519                         "armv4/5 specific commands");
 520
 521         register_command(cmd_ctx, armv4_5_cmd, "reg",
 522                         handle_armv4_5_reg_command, COMMAND_EXEC,
 523                         "display ARM core registers");
 524         register_command(cmd_ctx, armv4_5_cmd, "core_state",
 525                         handle_armv4_5_core_state_command, COMMAND_EXEC,
 526                         "display/change ARM core state <arm | thumb>");
 527         register_command(cmd_ctx, armv4_5_cmd, "disassemble",
 528                         handle_armv4_5_disassemble_command, COMMAND_EXEC,
 529                         "disassemble instructions <address> [<count> ['thumb']]");
 530
 531         return ERROR_OK;
 532 }
 533
 534 int armv4_5_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int *reg_list_size)
 535 {
 536         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 537         int i;
 538
 539         if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
 540                 return ERROR_FAIL;
 541
 542         *reg_list_size = 26;
 543         *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
 544
 545         for (i = 0; i < 16; i++)
 546         {
 547                 (*reg_list)[i] = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i);
 548         }
 549
 550         for (i = 16; i < 24; i++)
 551         {
 552                 (*reg_list)[i] = &armv4_5_gdb_dummy_fp_reg;
 553         }
 554
 555         (*reg_list)[24] = &armv4_5_gdb_dummy_fps_reg;
 556         (*reg_list)[25] = &armv4_5->core_cache->reg_list[ARMV4_5_CPSR];
 557
 558         return ERROR_OK;
 559 }
 560
 561 /* wait for execution to complete and check exit point */
 562 static int armv4_5_run_algorithm_completion(struct target *target, uint32_t exit_point, int timeout_ms, void *arch_info)
 563 {
 564         int retval;
 565         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 566
 567         if ((retval = target_wait_state(target, TARGET_HALTED, timeout_ms)) != ERROR_OK)
 568         {
 569                 return retval;
 570         }
 571         if (target->state != TARGET_HALTED)
 572         {
 573                 if ((retval = target_halt(target)) != ERROR_OK)
 574                         return retval;
 575                 if ((retval = target_wait_state(target, TARGET_HALTED, 500)) != ERROR_OK)
 576                 {
 577                         return retval;
 578                 }
 579                 return ERROR_TARGET_TIMEOUT;
 580         }
 581
 582         /* fast exit: ARMv5+ code can use BKPT */
 583         if (exit_point && buf_get_u32(armv4_5->core_cache->reg_list[15].value,
 584                                 0, 32) != exit_point)
 585         {
 586                 LOG_WARNING("target reentered debug state, but not at the desired exit point: 0x%4.4" PRIx32 "",
 587                         buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
 588                 return ERROR_TARGET_TIMEOUT;
 589         }
 590
 591         return ERROR_OK;
 592 }
 593
 594 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))
 595 {
 596         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 597         struct armv4_5_algorithm *armv4_5_algorithm_info = arch_info;
 598         enum armv4_5_state core_state = armv4_5->core_state;
 599         enum armv4_5_mode core_mode = armv4_5->core_mode;
 600         uint32_t context[17];
 601         uint32_t cpsr;
 602         int exit_breakpoint_size = 0;
 603         int i;
 604         int retval = ERROR_OK;
 605         LOG_DEBUG("Running algorithm");
 606
 607         if (armv4_5_algorithm_info->common_magic != ARMV4_5_COMMON_MAGIC)
 608         {
 609                 LOG_ERROR("current target isn't an ARMV4/5 target");
 610                 return ERROR_TARGET_INVALID;
 611         }
 612
 613         if (target->state != TARGET_HALTED)
 614         {
 615                 LOG_WARNING("target not halted");
 616                 return ERROR_TARGET_NOT_HALTED;
 617         }
 618
 619         if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
 620                 return ERROR_FAIL;
 621
 622         /* armv5 and later can terminate with BKPT instruction; less overhead */
 623         if (!exit_point && armv4_5->is_armv4)
 624         {
 625                 LOG_ERROR("ARMv4 target needs HW breakpoint location");
 626                 return ERROR_FAIL;
 627         }
 628
 629         for (i = 0; i <= 16; i++)
 630         {
 631                 if (!ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).valid)
 632                         armv4_5->read_core_reg(target, i, armv4_5_algorithm_info->core_mode);
 633                 context[i] = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32);
 634         }
 635         cpsr = buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32);
 636
 637         for (i = 0; i < num_mem_params; i++)
 638         {
 639                 if ((retval = target_write_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
 640                 {
 641                         return retval;
 642                 }
 643         }
 644
 645         for (i = 0; i < num_reg_params; i++)
 646         {
 647                 struct reg *reg = register_get_by_name(armv4_5->core_cache, reg_params[i].reg_name, 0);
 648                 if (!reg)
 649                 {
 650                         LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 651                         exit(-1);
 652                 }
 653
 654                 if (reg->size != reg_params[i].size)
 655                 {
 656                         LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
 657                         exit(-1);
 658                 }
 659
 660                 if ((retval = armv4_5_set_core_reg(reg, reg_params[i].value)) != ERROR_OK)
 661                 {
 662                         return retval;
 663                 }
 664         }
 665
 666         armv4_5->core_state = armv4_5_algorithm_info->core_state;
 667         if (armv4_5->core_state == ARMV4_5_STATE_ARM)
 668                 exit_breakpoint_size = 4;
 669         else if (armv4_5->core_state == ARMV4_5_STATE_THUMB)
 670                 exit_breakpoint_size = 2;
 671         else
 672         {
 673                 LOG_ERROR("BUG: can't execute algorithms when not in ARM or Thumb state");
 674                 exit(-1);
 675         }
 676
 677         if (armv4_5_algorithm_info->core_mode != ARMV4_5_MODE_ANY)
 678         {
 679                 LOG_DEBUG("setting core_mode: 0x%2.2x", armv4_5_algorithm_info->core_mode);
 680                 buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 5, armv4_5_algorithm_info->core_mode);
 681                 armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
 682                 armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
 683         }
 684
 685         /* terminate using a hardware or (ARMv5+) software breakpoint */
 686         if (exit_point && (retval = breakpoint_add(target, exit_point,
 687                                 exit_breakpoint_size, BKPT_HARD)) != ERROR_OK)
 688         {
 689                 LOG_ERROR("can't add HW breakpoint to terminate algorithm");
 690                 return ERROR_TARGET_FAILURE;
 691         }
 692
 693         if ((retval = target_resume(target, 0, entry_point, 1, 1)) != ERROR_OK)
 694         {
 695                 return retval;
 696         }
 697         int retvaltemp;
 698         retval = run_it(target, exit_point, timeout_ms, arch_info);
 699
 700         if (exit_point)
 701                 breakpoint_remove(target, exit_point);
 702
 703         if (retval != ERROR_OK)
 704                 return retval;
 705
 706         for (i = 0; i < num_mem_params; i++)
 707         {
 708                 if (mem_params[i].direction != PARAM_OUT)
 709                         if ((retvaltemp = target_read_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
 710                         {
 711                                         retval = retvaltemp;
 712                         }
 713         }
 714
 715         for (i = 0; i < num_reg_params; i++)
 716         {
 717                 if (reg_params[i].direction != PARAM_OUT)
 718                 {
 719
 720                         struct reg *reg = register_get_by_name(armv4_5->core_cache, reg_params[i].reg_name, 0);
 721                         if (!reg)
 722                         {
 723                                 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 724                                 exit(-1);
 725                         }
 726
 727                         if (reg->size != reg_params[i].size)
 728                         {
 729                                 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
 730                                 exit(-1);
 731                         }
 732
 733                         buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
 734                 }
 735         }
 736
 737         for (i = 0; i <= 16; i++)
 738         {
 739                 uint32_t regvalue;
 740                 regvalue = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32);
 741                 if (regvalue != context[i])
 742                 {
 743                         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]);
 744                         buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).value, 0, 32, context[i]);
 745                         ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).valid = 1;
 746                         ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_algorithm_info->core_mode, i).dirty = 1;
 747                 }
 748         }
 749         buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32, cpsr);
 750         armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
 751         armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
 752
 753         armv4_5->core_state = core_state;
 754         armv4_5->core_mode = core_mode;
 755
 756         return retval;
 757 }
 758
 759 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)
 760 {
 761         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);
 762 }
 763
 764 /**
 765  * Runs ARM code in the target to calculate a CRC32 checksum.
 766  *
 767  * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
 768  */
 769 int arm_checksum_memory(struct target *target,
 770                 uint32_t address, uint32_t count, uint32_t *checksum)
 771 {
 772         struct working_area *crc_algorithm;
 773         struct armv4_5_algorithm armv4_5_info;
 774         struct reg_param reg_params[2];
 775         int retval;
 776         uint32_t i;
 777
 778         static const uint32_t arm_crc_code[] = {
 779                 0xE1A02000,             /* mov          r2, r0 */
 780                 0xE3E00000,             /* mov          r0, #0xffffffff */
 781                 0xE1A03001,             /* mov          r3, r1 */
 782                 0xE3A04000,             /* mov          r4, #0 */
 783                 0xEA00000B,             /* b            ncomp */
 784                 /* nbyte: */
 785                 0xE7D21004,             /* ldrb r1, [r2, r4] */
 786                 0xE59F7030,             /* ldr          r7, CRC32XOR */
 787                 0xE0200C01,             /* eor          r0, r0, r1, asl 24 */
 788                 0xE3A05000,             /* mov          r5, #0 */
 789                 /* loop: */
 790                 0xE3500000,             /* cmp          r0, #0 */
 791                 0xE1A06080,             /* mov          r6, r0, asl #1 */
 792                 0xE2855001,             /* add          r5, r5, #1 */
 793                 0xE1A00006,             /* mov          r0, r6 */
 794                 0xB0260007,             /* eorlt        r0, r6, r7 */
 795                 0xE3550008,             /* cmp          r5, #8 */
 796                 0x1AFFFFF8,             /* bne          loop */
 797                 0xE2844001,             /* add          r4, r4, #1 */
 798                 /* ncomp: */
 799                 0xE1540003,             /* cmp          r4, r3 */
 800                 0x1AFFFFF1,             /* bne          nbyte */
 801                 /* end: */
 802                 0xEAFFFFFE,             /* b            end */
 803                 /* CRC32XOR: */
 804                 0x04C11DB7              /* .word 0x04C11DB7 */
 805         };
 806
 807         retval = target_alloc_working_area(target,
 808                         sizeof(arm_crc_code), &crc_algorithm);
 809         if (retval != ERROR_OK)
 810                 return retval;
 811
 812         /* convert code into a buffer in target endianness */
 813         for (i = 0; i < ARRAY_SIZE(arm_crc_code); i++) {
 814                 retval = target_write_u32(target,
 815                                 crc_algorithm->address + i * sizeof(uint32_t),
 816                                 arm_crc_code[i]);
 817                 if (retval != ERROR_OK)
 818                         return retval;
 819         }
 820
 821         armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
 822         armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
 823         armv4_5_info.core_state = ARMV4_5_STATE_ARM;
 824
 825         init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
 826         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
 827
 828         buf_set_u32(reg_params[0].value, 0, 32, address);
 829         buf_set_u32(reg_params[1].value, 0, 32, count);
 830
 831         /* 20 second timeout/megabyte */
 832         int timeout = 20000 * (1 + (count / (1024 * 1024)));
 833
 834         retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
 835                         crc_algorithm->address,
 836                         crc_algorithm->address + sizeof(arm_crc_code) - 8,
 837                         timeout, &armv4_5_info);
 838         if (retval != ERROR_OK) {
 839                 LOG_ERROR("error executing ARM crc algorithm");
 840                 destroy_reg_param(&reg_params[0]);
 841                 destroy_reg_param(&reg_params[1]);
 842                 target_free_working_area(target, crc_algorithm);
 843                 return retval;
 844         }
 845
 846         *checksum = buf_get_u32(reg_params[0].value, 0, 32);
 847
 848         destroy_reg_param(&reg_params[0]);
 849         destroy_reg_param(&reg_params[1]);
 850
 851         target_free_working_area(target, crc_algorithm);
 852
 853         return ERROR_OK;
 854 }
 855
 856 /**
 857  * Runs ARM code in the target to check whether a memory block holds
 858  * all ones.  NOR flash which has been erased, and thus may be written,
 859  * holds all ones.
 860  *
 861  * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
 862  */
 863 int arm_blank_check_memory(struct target *target,
 864                 uint32_t address, uint32_t count, uint32_t *blank)
 865 {
 866         struct working_area *check_algorithm;
 867         struct reg_param reg_params[3];
 868         struct armv4_5_algorithm armv4_5_info;
 869         int retval;
 870         uint32_t i;
 871
 872         static const uint32_t check_code[] = {
 873                 /* loop: */
 874                 0xe4d03001,             /* ldrb r3, [r0], #1 */
 875                 0xe0022003,             /* and r2, r2, r3    */
 876                 0xe2511001,             /* subs r1, r1, #1   */
 877                 0x1afffffb,             /* bne loop          */
 878                 /* end: */
 879                 0xeafffffe              /* b end             */
 880         };
 881
 882         /* make sure we have a working area */
 883         retval = target_alloc_working_area(target,
 884                         sizeof(check_code), &check_algorithm);
 885         if (retval != ERROR_OK)
 886                 return retval;
 887
 888         /* convert code into a buffer in target endianness */
 889         for (i = 0; i < ARRAY_SIZE(check_code); i++) {
 890                 retval = target_write_u32(target,
 891                                 check_algorithm->address
 892                                                 + i * sizeof(uint32_t),
 893                                 check_code[i]);
 894                 if (retval != ERROR_OK)
 895                         return retval;
 896         }
 897
 898         armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
 899         armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
 900         armv4_5_info.core_state = ARMV4_5_STATE_ARM;
 901
 902         init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
 903         buf_set_u32(reg_params[0].value, 0, 32, address);
 904
 905         init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
 906         buf_set_u32(reg_params[1].value, 0, 32, count);
 907
 908         init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
 909         buf_set_u32(reg_params[2].value, 0, 32, 0xff);
 910
 911         retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
 912                         check_algorithm->address,
 913                         check_algorithm->address + sizeof(check_code) - 4,
 914                         10000, &armv4_5_info);
 915         if (retval != ERROR_OK) {
 916                 destroy_reg_param(&reg_params[0]);
 917                 destroy_reg_param(&reg_params[1]);
 918                 destroy_reg_param(&reg_params[2]);
 919                 target_free_working_area(target, check_algorithm);
 920                 return retval;
 921         }
 922
 923         *blank = buf_get_u32(reg_params[2].value, 0, 32);
 924
 925         destroy_reg_param(&reg_params[0]);
 926         destroy_reg_param(&reg_params[1]);
 927         destroy_reg_param(&reg_params[2]);
 928
 929         target_free_working_area(target, check_algorithm);
 930
 931         return ERROR_OK;
 932 }
 933
 934 int armv4_5_init_arch_info(struct target *target, struct arm *armv4_5)
 935 {
 936         target->arch_info = armv4_5;
 937
 938         armv4_5->common_magic = ARMV4_5_COMMON_MAGIC;
 939         armv4_5->core_state = ARMV4_5_STATE_ARM;
 940         armv4_5->core_mode = ARMV4_5_MODE_USR;
 941
 942         return ERROR_OK;
 943 }