git.sur5r.net Git - openocd/blob - src/target/mips32.c

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Spencer Oliver                                  *
   3  *   spen@spen-soft.co.uk                                                  *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by David T.L. Wong                                 *
   6  *                                                                         *
   7  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   8  *   oyvind.harboe@zylin.com                                               *
   9  *                                                                         *
  10  *   This program is free software; you can redistribute it and/or modify  *
  11  *   it under the terms of the GNU General Public License as published by  *
  12  *   the Free Software Foundation; either version 2 of the License, or     *
  13  *   (at your option) any later version.                                   *
  14  *                                                                         *
  15  *   This program is distributed in the hope that it will be useful,       *
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  18  *   GNU General Public License for more details.                          *
  19  *                                                                         *
  20  *   You should have received a copy of the GNU General Public License     *
  21  *   along with this program; if not, write to the                         *
  22  *   Free Software Foundation, Inc.,                                       *
  23  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  24  ***************************************************************************/
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include "mips32.h"
  30 #include "breakpoints.h"
  31 #include "algorithm.h"
  32 #include "register.h"
  33
  34 static char* mips32_core_reg_list[] =
  35 {
  36         "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
  37         "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
  38         "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
  39         "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra",
  40         "status", "lo", "hi", "badvaddr", "cause", "pc"
  41 };
  42
  43 static const char *mips_isa_strings[] =
  44 {
  45         "MIPS32", "MIPS16e"
  46 };
  47
  48 static struct mips32_core_reg mips32_core_reg_list_arch_info[MIPS32NUMCOREREGS] =
  49 {
  50         {0, NULL, NULL},
  51         {1, NULL, NULL},
  52         {2, NULL, NULL},
  53         {3, NULL, NULL},
  54         {4, NULL, NULL},
  55         {5, NULL, NULL},
  56         {6, NULL, NULL},
  57         {7, NULL, NULL},
  58         {8, NULL, NULL},
  59         {9, NULL, NULL},
  60         {10, NULL, NULL},
  61         {11, NULL, NULL},
  62         {12, NULL, NULL},
  63         {13, NULL, NULL},
  64         {14, NULL, NULL},
  65         {15, NULL, NULL},
  66         {16, NULL, NULL},
  67         {17, NULL, NULL},
  68         {18, NULL, NULL},
  69         {19, NULL, NULL},
  70         {20, NULL, NULL},
  71         {21, NULL, NULL},
  72         {22, NULL, NULL},
  73         {23, NULL, NULL},
  74         {24, NULL, NULL},
  75         {25, NULL, NULL},
  76         {26, NULL, NULL},
  77         {27, NULL, NULL},
  78         {28, NULL, NULL},
  79         {29, NULL, NULL},
  80         {30, NULL, NULL},
  81         {31, NULL, NULL},
  82
  83         {32, NULL, NULL},
  84         {33, NULL, NULL},
  85         {34, NULL, NULL},
  86         {35, NULL, NULL},
  87         {36, NULL, NULL},
  88         {37, NULL, NULL},
  89 };
  90
  91 /* number of mips dummy fp regs fp0 - fp31 + fsr and fir
  92  * we also add 18 unknown registers to handle gdb requests */
  93
  94 #define MIPS32NUMFPREGS 34 + 18
  95
  96 static uint8_t mips32_gdb_dummy_fp_value[] = {0, 0, 0, 0};
  97
  98 static struct reg mips32_gdb_dummy_fp_reg =
  99 {
 100         .name = "GDB dummy floating-point register",
 101         .value = mips32_gdb_dummy_fp_value,
 102         .dirty = 0,
 103         .valid = 1,
 104         .size = 32,
 105         .arch_info = NULL,
 106 };
 107
 108 static int mips32_get_core_reg(struct reg *reg)
 109 {
 110         int retval;
 111         struct mips32_core_reg *mips32_reg = reg->arch_info;
 112         struct target *target = mips32_reg->target;
 113         struct mips32_common *mips32_target = target_to_mips32(target);
 114
 115         if (target->state != TARGET_HALTED)
 116         {
 117                 return ERROR_TARGET_NOT_HALTED;
 118         }
 119
 120         retval = mips32_target->read_core_reg(target, mips32_reg->num);
 121
 122         return retval;
 123 }
 124
 125 static int mips32_set_core_reg(struct reg *reg, uint8_t *buf)
 126 {
 127         struct mips32_core_reg *mips32_reg = reg->arch_info;
 128         struct target *target = mips32_reg->target;
 129         uint32_t value = buf_get_u32(buf, 0, 32);
 130
 131         if (target->state != TARGET_HALTED)
 132         {
 133                 return ERROR_TARGET_NOT_HALTED;
 134         }
 135
 136         buf_set_u32(reg->value, 0, 32, value);
 137         reg->dirty = 1;
 138         reg->valid = 1;
 139
 140         return ERROR_OK;
 141 }
 142
 143 static int mips32_read_core_reg(struct target *target, int num)
 144 {
 145         uint32_t reg_value;
 146         struct mips32_core_reg *mips_core_reg;
 147
 148         /* get pointers to arch-specific information */
 149         struct mips32_common *mips32 = target_to_mips32(target);
 150
 151         if ((num < 0) || (num >= MIPS32NUMCOREREGS))
 152                 return ERROR_INVALID_ARGUMENTS;
 153
 154         mips_core_reg = mips32->core_cache->reg_list[num].arch_info;
 155         reg_value = mips32->core_regs[num];
 156         buf_set_u32(mips32->core_cache->reg_list[num].value, 0, 32, reg_value);
 157         mips32->core_cache->reg_list[num].valid = 1;
 158         mips32->core_cache->reg_list[num].dirty = 0;
 159
 160         return ERROR_OK;
 161 }
 162
 163 static int mips32_write_core_reg(struct target *target, int num)
 164 {
 165         uint32_t reg_value;
 166         struct mips32_core_reg *mips_core_reg;
 167
 168         /* get pointers to arch-specific information */
 169         struct mips32_common *mips32 = target_to_mips32(target);
 170
 171         if ((num < 0) || (num >= MIPS32NUMCOREREGS))
 172                 return ERROR_INVALID_ARGUMENTS;
 173
 174         reg_value = buf_get_u32(mips32->core_cache->reg_list[num].value, 0, 32);
 175         mips_core_reg = mips32->core_cache->reg_list[num].arch_info;
 176         mips32->core_regs[num] = reg_value;
 177         LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", num , reg_value);
 178         mips32->core_cache->reg_list[num].valid = 1;
 179         mips32->core_cache->reg_list[num].dirty = 0;
 180
 181         return ERROR_OK;
 182 }
 183
 184 int mips32_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int *reg_list_size)
 185 {
 186         /* get pointers to arch-specific information */
 187         struct mips32_common *mips32 = target_to_mips32(target);
 188         int i;
 189
 190         /* include floating point registers */
 191         *reg_list_size = MIPS32NUMCOREREGS + MIPS32NUMFPREGS;
 192         *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
 193
 194         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 195         {
 196                 (*reg_list)[i] = &mips32->core_cache->reg_list[i];
 197         }
 198
 199         /* add dummy floating points regs */
 200         for (i = MIPS32NUMCOREREGS; i < (MIPS32NUMCOREREGS + MIPS32NUMFPREGS); i++)
 201         {
 202                 (*reg_list)[i] = &mips32_gdb_dummy_fp_reg;
 203         }
 204
 205         return ERROR_OK;
 206 }
 207
 208 int mips32_save_context(struct target *target)
 209 {
 210         int i;
 211
 212         /* get pointers to arch-specific information */
 213         struct mips32_common *mips32 = target_to_mips32(target);
 214         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 215
 216         /* read core registers */
 217         mips32_pracc_read_regs(ejtag_info, mips32->core_regs);
 218
 219         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 220         {
 221                 if (!mips32->core_cache->reg_list[i].valid)
 222                 {
 223                         mips32->read_core_reg(target, i);
 224                 }
 225         }
 226
 227         return ERROR_OK;
 228 }
 229
 230 int mips32_restore_context(struct target *target)
 231 {
 232         int i;
 233
 234         /* get pointers to arch-specific information */
 235         struct mips32_common *mips32 = target_to_mips32(target);
 236         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 237
 238         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 239         {
 240                 if (mips32->core_cache->reg_list[i].dirty)
 241                 {
 242                         mips32->write_core_reg(target, i);
 243                 }
 244         }
 245
 246         /* write core regs */
 247         mips32_pracc_write_regs(ejtag_info, mips32->core_regs);
 248
 249         return ERROR_OK;
 250 }
 251
 252 int mips32_arch_state(struct target *target)
 253 {
 254         struct mips32_common *mips32 = target_to_mips32(target);
 255
 256         LOG_USER("target halted in %s mode due to %s, pc: 0x%8.8" PRIx32 "",
 257                 mips_isa_strings[mips32->isa_mode],
 258                 debug_reason_name(target),
 259                 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
 260
 261         return ERROR_OK;
 262 }
 263
 264 static const struct reg_arch_type mips32_reg_type = {
 265         .get = mips32_get_core_reg,
 266         .set = mips32_set_core_reg,
 267 };
 268
 269 struct reg_cache *mips32_build_reg_cache(struct target *target)
 270 {
 271         /* get pointers to arch-specific information */
 272         struct mips32_common *mips32 = target_to_mips32(target);
 273
 274         int num_regs = MIPS32NUMCOREREGS;
 275         struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
 276         struct reg_cache *cache = malloc(sizeof(struct reg_cache));
 277         struct reg *reg_list = malloc(sizeof(struct reg) * num_regs);
 278         struct mips32_core_reg *arch_info = malloc(sizeof(struct mips32_core_reg) * num_regs);
 279         int i;
 280
 281         register_init_dummy(&mips32_gdb_dummy_fp_reg);
 282
 283         /* Build the process context cache */
 284         cache->name = "mips32 registers";
 285         cache->next = NULL;
 286         cache->reg_list = reg_list;
 287         cache->num_regs = num_regs;
 288         (*cache_p) = cache;
 289         mips32->core_cache = cache;
 290
 291         for (i = 0; i < num_regs; i++)
 292         {
 293                 arch_info[i] = mips32_core_reg_list_arch_info[i];
 294                 arch_info[i].target = target;
 295                 arch_info[i].mips32_common = mips32;
 296                 reg_list[i].name = mips32_core_reg_list[i];
 297                 reg_list[i].size = 32;
 298                 reg_list[i].value = calloc(1, 4);
 299                 reg_list[i].dirty = 0;
 300                 reg_list[i].valid = 0;
 301                 reg_list[i].type = &mips32_reg_type;
 302                 reg_list[i].arch_info = &arch_info[i];
 303         }
 304
 305         return cache;
 306 }
 307
 308 int mips32_init_arch_info(struct target *target, struct mips32_common *mips32, struct jtag_tap *tap)
 309 {
 310         target->arch_info = mips32;
 311         mips32->common_magic = MIPS32_COMMON_MAGIC;
 312         mips32->fast_data_area = NULL;
 313
 314         /* has breakpoint/watchpint unit been scanned */
 315         mips32->bp_scanned = 0;
 316         mips32->data_break_list = NULL;
 317
 318         mips32->ejtag_info.tap = tap;
 319         mips32->read_core_reg = mips32_read_core_reg;
 320         mips32->write_core_reg = mips32_write_core_reg;
 321
 322         return ERROR_OK;
 323 }
 324
 325 /* run to exit point. return error if exit point was not reached. */
 326 static int mips32_run_and_wait(struct target *target, uint32_t entry_point,
 327                 int timeout_ms, uint32_t exit_point, struct mips32_common *mips32)
 328 {
 329         uint32_t pc;
 330         int retval;
 331         /* This code relies on the target specific  resume() and  poll()->debug_entry()
 332          * sequence to write register values to the processor and the read them back */
 333         if ((retval = target_resume(target, 0, entry_point, 0, 1)) != ERROR_OK)
 334         {
 335                 return retval;
 336         }
 337
 338         retval = target_wait_state(target, TARGET_HALTED, timeout_ms);
 339         /* If the target fails to halt due to the breakpoint, force a halt */
 340         if (retval != ERROR_OK || target->state != TARGET_HALTED)
 341         {
 342                 if ((retval = target_halt(target)) != ERROR_OK)
 343                         return retval;
 344                 if ((retval = target_wait_state(target, TARGET_HALTED, 500)) != ERROR_OK)
 345                 {
 346                         return retval;
 347                 }
 348                 return ERROR_TARGET_TIMEOUT;
 349         }
 350
 351         pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
 352         if (exit_point && (pc != exit_point))
 353         {
 354                 LOG_DEBUG("failed algorithm halted at 0x%" PRIx32 " ", pc);
 355                 return ERROR_TARGET_TIMEOUT;
 356         }
 357
 358         return ERROR_OK;
 359 }
 360
 361 int mips32_run_algorithm(struct target *target, int num_mem_params,
 362                 struct mem_param *mem_params, int num_reg_params,
 363                 struct reg_param *reg_params, uint32_t entry_point,
 364                 uint32_t exit_point, int timeout_ms, void *arch_info)
 365 {
 366         struct mips32_common *mips32 = target_to_mips32(target);
 367         struct mips32_algorithm *mips32_algorithm_info = arch_info;
 368         enum mips32_isa_mode isa_mode = mips32->isa_mode;
 369
 370         uint32_t context[MIPS32NUMCOREREGS];
 371         int i;
 372         int retval = ERROR_OK;
 373
 374         LOG_DEBUG("Running algorithm");
 375
 376         /* NOTE: mips32_run_algorithm requires that each algorithm uses a software breakpoint
 377          * at the exit point */
 378
 379         if (mips32->common_magic != MIPS32_COMMON_MAGIC)
 380         {
 381                 LOG_ERROR("current target isn't a MIPS32 target");
 382                 return ERROR_TARGET_INVALID;
 383         }
 384
 385         if (target->state != TARGET_HALTED)
 386         {
 387                 LOG_WARNING("target not halted");
 388                 return ERROR_TARGET_NOT_HALTED;
 389         }
 390
 391         /* refresh core register cache */
 392         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 393         {
 394                 if (!mips32->core_cache->reg_list[i].valid)
 395                         mips32->read_core_reg(target, i);
 396                 context[i] = buf_get_u32(mips32->core_cache->reg_list[i].value, 0, 32);
 397         }
 398
 399         for (i = 0; i < num_mem_params; i++)
 400         {
 401                 if ((retval = target_write_buffer(target, mem_params[i].address,
 402                                 mem_params[i].size, mem_params[i].value)) != ERROR_OK)
 403                 {
 404                         return retval;
 405                 }
 406         }
 407
 408         for (i = 0; i < num_reg_params; i++)
 409         {
 410                 struct reg *reg = register_get_by_name(mips32->core_cache, reg_params[i].reg_name, 0);
 411
 412                 if (!reg)
 413                 {
 414                         LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 415                         return ERROR_INVALID_ARGUMENTS;
 416                 }
 417
 418                 if (reg->size != reg_params[i].size)
 419                 {
 420                         LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
 421                                         reg_params[i].reg_name);
 422                         return ERROR_INVALID_ARGUMENTS;
 423                 }
 424
 425                 mips32_set_core_reg(reg, reg_params[i].value);
 426         }
 427
 428         mips32->isa_mode = mips32_algorithm_info->isa_mode;
 429
 430         retval = mips32_run_and_wait(target, entry_point, timeout_ms, exit_point, mips32);
 431
 432         if (retval != ERROR_OK)
 433                 return retval;
 434
 435         for (i = 0; i < num_mem_params; i++)
 436         {
 437                 if (mem_params[i].direction != PARAM_OUT)
 438                 {
 439                         if ((retval = target_read_buffer(target, mem_params[i].address, mem_params[i].size,
 440                                         mem_params[i].value)) != ERROR_OK)
 441                         {
 442                                 return retval;
 443                         }
 444                 }
 445         }
 446
 447         for (i = 0; i < num_reg_params; i++)
 448         {
 449                 if (reg_params[i].direction != PARAM_OUT)
 450                 {
 451                         struct reg *reg = register_get_by_name(mips32->core_cache, reg_params[i].reg_name, 0);
 452                         if (!reg)
 453                         {
 454                                 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
 455                                 return ERROR_INVALID_ARGUMENTS;
 456                         }
 457
 458                         if (reg->size != reg_params[i].size)
 459                         {
 460                                 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
 461                                                 reg_params[i].reg_name);
 462                                 return ERROR_INVALID_ARGUMENTS;
 463                         }
 464
 465                         buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
 466                 }
 467         }
 468
 469         /* restore everything we saved before */
 470         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 471         {
 472                 uint32_t regvalue;
 473                 regvalue = buf_get_u32(mips32->core_cache->reg_list[i].value, 0, 32);
 474                 if (regvalue != context[i])
 475                 {
 476                         LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32,
 477                                 mips32->core_cache->reg_list[i].name, context[i]);
 478                         buf_set_u32(mips32->core_cache->reg_list[i].value,
 479                                         0, 32, context[i]);
 480                         mips32->core_cache->reg_list[i].valid = 1;
 481                         mips32->core_cache->reg_list[i].dirty = 1;
 482                 }
 483         }
 484
 485         mips32->isa_mode = isa_mode;
 486
 487         return ERROR_OK;
 488 }
 489
 490 int mips32_examine(struct target *target)
 491 {
 492         struct mips32_common *mips32 = target_to_mips32(target);
 493
 494         if (!target_was_examined(target))
 495         {
 496                 target_set_examined(target);
 497
 498                 /* we will configure later */
 499                 mips32->bp_scanned = 0;
 500                 mips32->num_inst_bpoints = 0;
 501                 mips32->num_data_bpoints = 0;
 502                 mips32->num_inst_bpoints_avail = 0;
 503                 mips32->num_data_bpoints_avail = 0;
 504         }
 505
 506         return ERROR_OK;
 507 }
 508
 509 int mips32_configure_break_unit(struct target *target)
 510 {
 511         /* get pointers to arch-specific information */
 512         struct mips32_common *mips32 = target_to_mips32(target);
 513         int retval;
 514         uint32_t dcr, bpinfo;
 515         int i;
 516
 517         if (mips32->bp_scanned)
 518                 return ERROR_OK;
 519
 520         /* get info about breakpoint support */
 521         if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
 522                 return retval;
 523
 524         if (dcr & EJTAG_DCR_IB)
 525         {
 526                 /* get number of inst breakpoints */
 527                 if ((retval = target_read_u32(target, EJTAG_IBS, &bpinfo)) != ERROR_OK)
 528                         return retval;
 529
 530                 mips32->num_inst_bpoints = (bpinfo >> 24) & 0x0F;
 531                 mips32->num_inst_bpoints_avail = mips32->num_inst_bpoints;
 532                 mips32->inst_break_list = calloc(mips32->num_inst_bpoints, sizeof(struct mips32_comparator));
 533                 for (i = 0; i < mips32->num_inst_bpoints; i++)
 534                 {
 535                         mips32->inst_break_list[i].reg_address = EJTAG_IBA1 + (0x100 * i);
 536                 }
 537
 538                 /* clear IBIS reg */
 539                 if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
 540                         return retval;
 541         }
 542
 543         if (dcr & EJTAG_DCR_DB)
 544         {
 545                 /* get number of data breakpoints */
 546                 if ((retval = target_read_u32(target, EJTAG_DBS, &bpinfo)) != ERROR_OK)
 547                         return retval;
 548
 549                 mips32->num_data_bpoints = (bpinfo >> 24) & 0x0F;
 550                 mips32->num_data_bpoints_avail = mips32->num_data_bpoints;
 551                 mips32->data_break_list = calloc(mips32->num_data_bpoints, sizeof(struct mips32_comparator));
 552                 for (i = 0; i < mips32->num_data_bpoints; i++)
 553                 {
 554                         mips32->data_break_list[i].reg_address = EJTAG_DBA1 + (0x100 * i);
 555                 }
 556
 557                 /* clear DBIS reg */
 558                 if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
 559                         return retval;
 560         }
 561
 562         LOG_DEBUG("DCR 0x%" PRIx32 " numinst %i numdata %i", dcr, mips32->num_inst_bpoints,
 563                         mips32->num_data_bpoints);
 564
 565         mips32->bp_scanned = 1;
 566
 567         return ERROR_OK;
 568 }
 569
 570 int mips32_enable_interrupts(struct target *target, int enable)
 571 {
 572         int retval;
 573         int update = 0;
 574         uint32_t dcr;
 575
 576         /* read debug control register */
 577         if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
 578                 return retval;
 579
 580         if (enable)
 581         {
 582                 if (!(dcr & EJTAG_DCR_INTE))
 583                 {
 584                         /* enable interrupts */
 585                         dcr |= EJTAG_DCR_INTE;
 586                         update = 1;
 587                 }
 588         }
 589         else
 590         {
 591                 if (dcr & EJTAG_DCR_INTE)
 592                 {
 593                         /* disable interrupts */
 594                         dcr &= ~EJTAG_DCR_INTE;
 595                         update = 1;
 596                 }
 597         }
 598
 599         if (update)
 600         {
 601                 if ((retval = target_write_u32(target, EJTAG_DCR, dcr)) != ERROR_OK)
 602                         return retval;
 603         }
 604
 605         return ERROR_OK;
 606 }
 607
 608 int mips32_checksum_memory(struct target *target, uint32_t address,
 609                 uint32_t count, uint32_t* checksum)
 610 {
 611         struct working_area *crc_algorithm;
 612         struct reg_param reg_params[2];
 613         struct mips32_algorithm mips32_info;
 614         int retval;
 615         uint32_t i;
 616
 617         /* see contib/loaders/checksum/mips32.s for src */
 618
 619         static const uint32_t mips_crc_code[] =
 620         {
 621                 0x248C0000,             /* addiu        $t4, $a0, 0 */
 622                 0x24AA0000,             /* addiu        $t2, $a1, 0 */
 623                 0x2404FFFF,             /* addiu        $a0, $zero, 0xffffffff */
 624                 0x10000010,             /* beq          $zero, $zero, ncomp */
 625                 0x240B0000,             /* addiu        $t3, $zero, 0 */
 626                                                 /* nbyte: */
 627                 0x81850000,             /* lb           $a1, ($t4) */
 628                 0x218C0001,             /* addi         $t4, $t4, 1 */
 629                 0x00052E00,             /* sll          $a1, $a1, 24 */
 630                 0x3C0204C1,             /* lui          $v0, 0x04c1 */
 631                 0x00852026,             /* xor          $a0, $a0, $a1 */
 632                 0x34471DB7,             /* ori          $a3, $v0, 0x1db7 */
 633                 0x00003021,             /* addu         $a2, $zero, $zero */
 634                                                 /* loop: */
 635                 0x00044040,             /* sll          $t0, $a0, 1 */
 636                 0x24C60001,             /* addiu        $a2, $a2, 1 */
 637                 0x28840000,             /* slti         $a0, $a0, 0 */
 638                 0x01074826,             /* xor          $t1, $t0, $a3 */
 639                 0x0124400B,             /* movn         $t0, $t1, $a0 */
 640                 0x28C30008,             /* slti         $v1, $a2, 8 */
 641                 0x1460FFF9,             /* bne          $v1, $zero, loop */
 642                 0x01002021,             /* addu         $a0, $t0, $zero */
 643                                                 /* ncomp: */
 644                 0x154BFFF0,             /* bne          $t2, $t3, nbyte */
 645                 0x256B0001,             /* addiu        $t3, $t3, 1 */
 646                 0x7000003F,             /* sdbbp */
 647         };
 648
 649         /* make sure we have a working area */
 650         if (target_alloc_working_area(target, sizeof(mips_crc_code), &crc_algorithm) != ERROR_OK)
 651         {
 652                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 653         }
 654
 655         /* convert flash writing code into a buffer in target endianness */
 656         for (i = 0; i < ARRAY_SIZE(mips_crc_code); i++)
 657                 target_write_u32(target, crc_algorithm->address + i*sizeof(uint32_t), mips_crc_code[i]);
 658
 659         mips32_info.common_magic = MIPS32_COMMON_MAGIC;
 660         mips32_info.isa_mode = MIPS32_ISA_MIPS32;
 661
 662         init_reg_param(&reg_params[0], "a0", 32, PARAM_IN_OUT);
 663         buf_set_u32(reg_params[0].value, 0, 32, address);
 664
 665         init_reg_param(&reg_params[1], "a1", 32, PARAM_OUT);
 666         buf_set_u32(reg_params[1].value, 0, 32, count);
 667
 668         int timeout = 20000 * (1 + (count / (1024 * 1024)));
 669
 670         if ((retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
 671                         crc_algorithm->address, crc_algorithm->address + (sizeof(mips_crc_code)-4), timeout,
 672                         &mips32_info)) != ERROR_OK)
 673         {
 674                 destroy_reg_param(&reg_params[0]);
 675                 destroy_reg_param(&reg_params[1]);
 676                 target_free_working_area(target, crc_algorithm);
 677                 return 0;
 678         }
 679
 680         *checksum = buf_get_u32(reg_params[0].value, 0, 32);
 681
 682         destroy_reg_param(&reg_params[0]);
 683         destroy_reg_param(&reg_params[1]);
 684
 685         target_free_working_area(target, crc_algorithm);
 686
 687         return ERROR_OK;
 688 }
 689
 690 /** Checks whether a memory region is zeroed. */
 691 int mips32_blank_check_memory(struct target *target,
 692                 uint32_t address, uint32_t count, uint32_t* blank)
 693 {
 694         struct working_area *erase_check_algorithm;
 695         struct reg_param reg_params[3];
 696         struct mips32_algorithm mips32_info;
 697         int retval;
 698         uint32_t i;
 699
 700         static const uint32_t erase_check_code[] =
 701         {
 702                                                 /* nbyte: */
 703                 0x80880000,             /* lb           $t0, ($a0) */
 704                 0x00C83024,             /* and          $a2, $a2, $t0 */
 705                 0x24A5FFFF,             /* addiu        $a1, $a1, -1 */
 706                 0x14A0FFFC,             /* bne          $a1, $zero, nbyte */
 707                 0x24840001,             /* addiu        $a0, $a0, 1 */
 708                 0x7000003F              /* sdbbp */
 709         };
 710
 711         /* make sure we have a working area */
 712         if (target_alloc_working_area(target, sizeof(erase_check_code), &erase_check_algorithm) != ERROR_OK)
 713         {
 714                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 715         }
 716
 717         /* convert flash writing code into a buffer in target endianness */
 718         for (i = 0; i < ARRAY_SIZE(erase_check_code); i++)
 719         {
 720                 target_write_u32(target, erase_check_algorithm->address + i*sizeof(uint32_t),
 721                                 erase_check_code[i]);
 722         }
 723
 724         mips32_info.common_magic = MIPS32_COMMON_MAGIC;
 725         mips32_info.isa_mode = MIPS32_ISA_MIPS32;
 726
 727         init_reg_param(&reg_params[0], "a0", 32, PARAM_OUT);
 728         buf_set_u32(reg_params[0].value, 0, 32, address);
 729
 730         init_reg_param(&reg_params[1], "a1", 32, PARAM_OUT);
 731         buf_set_u32(reg_params[1].value, 0, 32, count);
 732
 733         init_reg_param(&reg_params[2], "a2", 32, PARAM_IN_OUT);
 734         buf_set_u32(reg_params[2].value, 0, 32, 0xff);
 735
 736         if ((retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
 737                         erase_check_algorithm->address,
 738                         erase_check_algorithm->address + (sizeof(erase_check_code)-2),
 739                         10000, &mips32_info)) != ERROR_OK)
 740         {
 741                 destroy_reg_param(&reg_params[0]);
 742                 destroy_reg_param(&reg_params[1]);
 743                 destroy_reg_param(&reg_params[2]);
 744                 target_free_working_area(target, erase_check_algorithm);
 745                 return 0;
 746         }
 747
 748         *blank = buf_get_u32(reg_params[2].value, 0, 32);
 749
 750         destroy_reg_param(&reg_params[0]);
 751         destroy_reg_param(&reg_params[1]);
 752         destroy_reg_param(&reg_params[2]);
 753
 754         target_free_working_area(target, erase_check_algorithm);
 755
 756         return ERROR_OK;
 757 }