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   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  *   This program is free software; you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation; either version 2 of the License, or     *
  10  *   (at your option) any later version.                                   *
  11  *                                                                         *
  12  *   This program is distributed in the hope that it will be useful,       *
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  15  *   GNU General Public License for more details.                          *
  16  *                                                                         *
  17  *   You should have received a copy of the GNU General Public License     *
  18  *   along with this program; if not, write to the                         *
  19  *   Free Software Foundation, Inc.,                                       *
  20  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  21  ***************************************************************************/
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include "breakpoints.h"
  27 #include "mips32.h"
  28 #include "mips_m4k.h"
  29 #include "mips32_dmaacc.h"
  30 #include "target_type.h"
  31 #include "register.h"
  32
  33
  34 /* cli handling */
  35
  36 /* forward declarations */
  37 int mips_m4k_poll(struct target *target);
  38 int mips_m4k_halt(struct target *target);
  39 int mips_m4k_soft_reset_halt(struct target *target);
  40 int mips_m4k_resume(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution);
  41 int mips_m4k_step(struct target *target, int current, uint32_t address, int handle_breakpoints);
  42 int mips_m4k_read_memory(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
  43 int mips_m4k_write_memory(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
  44 int mips_m4k_register_commands(struct command_context *cmd_ctx);
  45 int mips_m4k_init_target(struct command_context *cmd_ctx, struct target *target);
  46 int mips_m4k_target_create(struct target *target, Jim_Interp *interp);
  47
  48 int mips_m4k_examine(struct target *target);
  49 int mips_m4k_assert_reset(struct target *target);
  50 int mips_m4k_deassert_reset(struct target *target);
  51 int mips_m4k_checksum_memory(struct target *target, uint32_t address, uint32_t size, uint32_t *checksum);
  52
  53 struct target_type mips_m4k_target =
  54 {
  55         .name = "mips_m4k",
  56
  57         .poll = mips_m4k_poll,
  58         .arch_state = mips32_arch_state,
  59
  60         .target_request_data = NULL,
  61
  62         .halt = mips_m4k_halt,
  63         .resume = mips_m4k_resume,
  64         .step = mips_m4k_step,
  65
  66         .assert_reset = mips_m4k_assert_reset,
  67         .deassert_reset = mips_m4k_deassert_reset,
  68         .soft_reset_halt = mips_m4k_soft_reset_halt,
  69
  70         .get_gdb_reg_list = mips32_get_gdb_reg_list,
  71
  72         .read_memory = mips_m4k_read_memory,
  73         .write_memory = mips_m4k_write_memory,
  74         .bulk_write_memory = mips_m4k_bulk_write_memory,
  75         .checksum_memory = mips_m4k_checksum_memory,
  76         .blank_check_memory = NULL,
  77
  78         .run_algorithm = mips32_run_algorithm,
  79
  80         .add_breakpoint = mips_m4k_add_breakpoint,
  81         .remove_breakpoint = mips_m4k_remove_breakpoint,
  82         .add_watchpoint = mips_m4k_add_watchpoint,
  83         .remove_watchpoint = mips_m4k_remove_watchpoint,
  84
  85         .register_commands = mips_m4k_register_commands,
  86         .target_create = mips_m4k_target_create,
  87         .init_target = mips_m4k_init_target,
  88         .examine = mips_m4k_examine,
  89 };
  90
  91 int mips_m4k_examine_debug_reason(struct target *target)
  92 {
  93         uint32_t break_status;
  94         int retval;
  95
  96         if ((target->debug_reason != DBG_REASON_DBGRQ)
  97                 && (target->debug_reason != DBG_REASON_SINGLESTEP))
  98         {
  99                 /* get info about inst breakpoint support */
 100                 if ((retval = target_read_u32(target, EJTAG_IBS, &break_status)) != ERROR_OK)
 101                         return retval;
 102                 if (break_status & 0x1f)
 103                 {
 104                         /* we have halted on a  breakpoint */
 105                         if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
 106                                 return retval;
 107                         target->debug_reason = DBG_REASON_BREAKPOINT;
 108                 }
 109
 110                 /* get info about data breakpoint support */
 111                 if ((retval = target_read_u32(target, 0xFF302000, &break_status)) != ERROR_OK)
 112                         return retval;
 113                 if (break_status & 0x1f)
 114                 {
 115                         /* we have halted on a  breakpoint */
 116                         if ((retval = target_write_u32(target, 0xFF302000, 0)) != ERROR_OK)
 117                                 return retval;
 118                         target->debug_reason = DBG_REASON_WATCHPOINT;
 119                 }
 120         }
 121
 122         return ERROR_OK;
 123 }
 124
 125 int mips_m4k_debug_entry(struct target *target)
 126 {
 127         struct mips32_common *mips32 = target->arch_info;
 128         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 129         uint32_t debug_reg;
 130
 131         /* read debug register */
 132         mips_ejtag_read_debug(ejtag_info, &debug_reg);
 133
 134         /* make sure break uit configured */
 135         mips32_configure_break_unit(target);
 136
 137         /* attempt to find halt reason */
 138         mips_m4k_examine_debug_reason(target);
 139
 140         /* clear single step if active */
 141         if (debug_reg & EJTAG_DEBUG_DSS)
 142         {
 143                 /* stopped due to single step - clear step bit */
 144                 mips_ejtag_config_step(ejtag_info, 0);
 145         }
 146
 147         mips32_save_context(target);
 148
 149         LOG_DEBUG("entered debug state at PC 0x%" PRIx32 ", target->state: %s",
 150                 *(uint32_t*)(mips32->core_cache->reg_list[MIPS32_PC].value),
 151                   target_state_name(target));
 152
 153         return ERROR_OK;
 154 }
 155
 156 int mips_m4k_poll(struct target *target)
 157 {
 158         int retval;
 159         struct mips32_common *mips32 = target->arch_info;
 160         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 161         uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl;
 162
 163         /* read ejtag control reg */
 164         jtag_set_end_state(TAP_IDLE);
 165         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
 166         mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
 167
 168         /* clear this bit before handling polling
 169          * as after reset registers will read zero */
 170         if (ejtag_ctrl & EJTAG_CTRL_ROCC)
 171         {
 172                 /* we have detected a reset, clear flag
 173                  * otherwise ejtag will not work */
 174                 jtag_set_end_state(TAP_IDLE);
 175                 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_ROCC;
 176
 177                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
 178                 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
 179                 LOG_DEBUG("Reset Detected");
 180         }
 181
 182         /* check for processor halted */
 183         if (ejtag_ctrl & EJTAG_CTRL_BRKST)
 184         {
 185                 if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
 186                 {
 187                         jtag_set_end_state(TAP_IDLE);
 188                         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT, NULL);
 189
 190                         target->state = TARGET_HALTED;
 191
 192                         if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
 193                                 return retval;
 194
 195                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 196                 }
 197                 else if (target->state == TARGET_DEBUG_RUNNING)
 198                 {
 199                         target->state = TARGET_HALTED;
 200
 201                         if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
 202                                 return retval;
 203
 204                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 205                 }
 206         }
 207         else
 208         {
 209                 target->state = TARGET_RUNNING;
 210         }
 211
 212 //      LOG_DEBUG("ctrl = 0x%08X", ejtag_ctrl);
 213
 214         return ERROR_OK;
 215 }
 216
 217 int mips_m4k_halt(struct target *target)
 218 {
 219         struct mips32_common *mips32 = target->arch_info;
 220         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 221
 222         LOG_DEBUG("target->state: %s",
 223                   target_state_name(target));
 224
 225         if (target->state == TARGET_HALTED)
 226         {
 227                 LOG_DEBUG("target was already halted");
 228                 return ERROR_OK;
 229         }
 230
 231         if (target->state == TARGET_UNKNOWN)
 232         {
 233                 LOG_WARNING("target was in unknown state when halt was requested");
 234         }
 235
 236         if (target->state == TARGET_RESET)
 237         {
 238                 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst())
 239                 {
 240                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 241                         return ERROR_TARGET_FAILURE;
 242                 }
 243                 else
 244                 {
 245                         /* we came here in a reset_halt or reset_init sequence
 246                          * debug entry was already prepared in mips32_prepare_reset_halt()
 247                          */
 248                         target->debug_reason = DBG_REASON_DBGRQ;
 249
 250                         return ERROR_OK;
 251                 }
 252         }
 253
 254         /* break processor */
 255         mips_ejtag_enter_debug(ejtag_info);
 256
 257         target->debug_reason = DBG_REASON_DBGRQ;
 258
 259         return ERROR_OK;
 260 }
 261
 262 int mips_m4k_assert_reset(struct target *target)
 263 {
 264         struct mips32_common *mips32 = target->arch_info;
 265         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 266
 267         LOG_DEBUG("target->state: %s",
 268                 target_state_name(target));
 269
 270         enum reset_types jtag_reset_config = jtag_get_reset_config();
 271         if (!(jtag_reset_config & RESET_HAS_SRST))
 272         {
 273                 LOG_ERROR("Can't assert SRST");
 274                 return ERROR_FAIL;
 275         }
 276
 277         if (target->reset_halt)
 278         {
 279                 /* use hardware to catch reset */
 280                 jtag_set_end_state(TAP_IDLE);
 281                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT, NULL);
 282         }
 283         else
 284         {
 285                 jtag_set_end_state(TAP_IDLE);
 286                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT, NULL);
 287         }
 288
 289         if (strcmp(target->variant, "ejtag_srst") == 0)
 290         {
 291                 uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_PRRST | EJTAG_CTRL_PERRST;
 292                 LOG_DEBUG("Using EJTAG reset (PRRST) to reset processor...");
 293                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
 294                 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
 295         }
 296         else
 297         {
 298                 /* here we should issue a srst only, but we may have to assert trst as well */
 299                 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 300                 {
 301                         jtag_add_reset(1, 1);
 302                 }
 303                 else
 304                 {
 305                         jtag_add_reset(0, 1);
 306                 }
 307         }
 308
 309         target->state = TARGET_RESET;
 310         jtag_add_sleep(50000);
 311
 312         mips32_invalidate_core_regs(target);
 313
 314         if (target->reset_halt)
 315         {
 316                 int retval;
 317                 if ((retval = target_halt(target)) != ERROR_OK)
 318                         return retval;
 319         }
 320
 321         return ERROR_OK;
 322 }
 323
 324 int mips_m4k_deassert_reset(struct target *target)
 325 {
 326         LOG_DEBUG("target->state: %s",
 327                 target_state_name(target));
 328
 329         /* deassert reset lines */
 330         jtag_add_reset(0, 0);
 331
 332         return ERROR_OK;
 333 }
 334
 335 int mips_m4k_soft_reset_halt(struct target *target)
 336 {
 337         /* TODO */
 338         return ERROR_OK;
 339 }
 340
 341 int mips_m4k_single_step_core(struct target *target)
 342 {
 343         struct mips32_common *mips32 = target->arch_info;
 344         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 345
 346         /* configure single step mode */
 347         mips_ejtag_config_step(ejtag_info, 1);
 348
 349         /* disable interrupts while stepping */
 350         mips32_enable_interrupts(target, 0);
 351
 352         /* exit debug mode */
 353         mips_ejtag_exit_debug(ejtag_info);
 354
 355         mips_m4k_debug_entry(target);
 356
 357         return ERROR_OK;
 358 }
 359
 360 int mips_m4k_resume(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution)
 361 {
 362         struct mips32_common *mips32 = target->arch_info;
 363         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 364         struct breakpoint *breakpoint = NULL;
 365         uint32_t resume_pc;
 366
 367         if (target->state != TARGET_HALTED)
 368         {
 369                 LOG_WARNING("target not halted");
 370                 return ERROR_TARGET_NOT_HALTED;
 371         }
 372
 373         if (!debug_execution)
 374         {
 375                 target_free_all_working_areas(target);
 376                 mips_m4k_enable_breakpoints(target);
 377                 mips_m4k_enable_watchpoints(target);
 378         }
 379
 380         /* current = 1: continue on current pc, otherwise continue at <address> */
 381         if (!current)
 382         {
 383                 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
 384                 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
 385                 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
 386         }
 387
 388         resume_pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
 389
 390         mips32_restore_context(target);
 391
 392         /* the front-end may request us not to handle breakpoints */
 393         if (handle_breakpoints)
 394         {
 395                 /* Single step past breakpoint at current address */
 396                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 397                 {
 398                         LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 "", breakpoint->address);
 399                         mips_m4k_unset_breakpoint(target, breakpoint);
 400                         mips_m4k_single_step_core(target);
 401                         mips_m4k_set_breakpoint(target, breakpoint);
 402                 }
 403         }
 404
 405         /* enable interrupts if we are running */
 406         mips32_enable_interrupts(target, !debug_execution);
 407
 408         /* exit debug mode */
 409         mips_ejtag_exit_debug(ejtag_info);
 410         target->debug_reason = DBG_REASON_NOTHALTED;
 411
 412         /* registers are now invalid */
 413         mips32_invalidate_core_regs(target);
 414
 415         if (!debug_execution)
 416         {
 417                 target->state = TARGET_RUNNING;
 418                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 419                 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
 420         }
 421         else
 422         {
 423                 target->state = TARGET_DEBUG_RUNNING;
 424                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 425                 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
 426         }
 427
 428         return ERROR_OK;
 429 }
 430
 431 int mips_m4k_step(struct target *target, int current, uint32_t address, int handle_breakpoints)
 432 {
 433         /* get pointers to arch-specific information */
 434         struct mips32_common *mips32 = target->arch_info;
 435         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 436         struct breakpoint *breakpoint = NULL;
 437
 438         if (target->state != TARGET_HALTED)
 439         {
 440                 LOG_WARNING("target not halted");
 441                 return ERROR_TARGET_NOT_HALTED;
 442         }
 443
 444         /* current = 1: continue on current pc, otherwise continue at <address> */
 445         if (!current)
 446                 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
 447
 448         /* the front-end may request us not to handle breakpoints */
 449         if (handle_breakpoints)
 450                 if ((breakpoint = breakpoint_find(target, buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32))))
 451                         mips_m4k_unset_breakpoint(target, breakpoint);
 452
 453         /* restore context */
 454         mips32_restore_context(target);
 455
 456         /* configure single step mode */
 457         mips_ejtag_config_step(ejtag_info, 1);
 458
 459         target->debug_reason = DBG_REASON_SINGLESTEP;
 460
 461         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 462
 463         /* disable interrupts while stepping */
 464         mips32_enable_interrupts(target, 0);
 465
 466         /* exit debug mode */
 467         mips_ejtag_exit_debug(ejtag_info);
 468
 469         /* registers are now invalid */
 470         mips32_invalidate_core_regs(target);
 471
 472         if (breakpoint)
 473                 mips_m4k_set_breakpoint(target, breakpoint);
 474
 475         LOG_DEBUG("target stepped ");
 476
 477         mips_m4k_debug_entry(target);
 478         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 479
 480         return ERROR_OK;
 481 }
 482
 483 void mips_m4k_enable_breakpoints(struct target *target)
 484 {
 485         struct breakpoint *breakpoint = target->breakpoints;
 486
 487         /* set any pending breakpoints */
 488         while (breakpoint)
 489         {
 490                 if (breakpoint->set == 0)
 491                         mips_m4k_set_breakpoint(target, breakpoint);
 492                 breakpoint = breakpoint->next;
 493         }
 494 }
 495
 496 int mips_m4k_set_breakpoint(struct target *target, struct breakpoint *breakpoint)
 497 {
 498         struct mips32_common *mips32 = target->arch_info;
 499         struct mips32_comparator * comparator_list = mips32->inst_break_list;
 500         int retval;
 501
 502         if (breakpoint->set)
 503         {
 504                 LOG_WARNING("breakpoint already set");
 505                 return ERROR_OK;
 506         }
 507
 508         if (breakpoint->type == BKPT_HARD)
 509         {
 510                 int bp_num = 0;
 511
 512                 while (comparator_list[bp_num].used && (bp_num < mips32->num_inst_bpoints))
 513                         bp_num++;
 514                 if (bp_num >= mips32->num_inst_bpoints)
 515                 {
 516                         LOG_ERROR("Can not find free FP Comparator(bpid: %d)",
 517                                           breakpoint->unique_id );
 518                         return ERROR_FAIL;
 519                 }
 520                 breakpoint->set = bp_num + 1;
 521                 comparator_list[bp_num].used = 1;
 522                 comparator_list[bp_num].bp_value = breakpoint->address;
 523                 target_write_u32(target, comparator_list[bp_num].reg_address, comparator_list[bp_num].bp_value);
 524                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x08, 0x00000000);
 525                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 1);
 526                 LOG_DEBUG("bpid: %d, bp_num %i bp_value 0x%" PRIx32 "",
 527                                   breakpoint->unique_id,
 528                                   bp_num, comparator_list[bp_num].bp_value);
 529         }
 530         else if (breakpoint->type == BKPT_SOFT)
 531         {
 532                 LOG_DEBUG("bpid: %d", breakpoint->unique_id );
 533                 if (breakpoint->length == 4)
 534                 {
 535                         uint32_t verify = 0xffffffff;
 536
 537                         if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1, breakpoint->orig_instr)) != ERROR_OK)
 538                         {
 539                                 return retval;
 540                         }
 541                         if ((retval = target_write_u32(target, breakpoint->address, MIPS32_SDBBP)) != ERROR_OK)
 542                         {
 543                                 return retval;
 544                         }
 545
 546                         if ((retval = target_read_u32(target, breakpoint->address, &verify)) != ERROR_OK)
 547                         {
 548                                 return retval;
 549                         }
 550                         if (verify != MIPS32_SDBBP)
 551                         {
 552                                 LOG_ERROR("Unable to set 32bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
 553                                 return ERROR_OK;
 554                         }
 555                 }
 556                 else
 557                 {
 558                         uint16_t verify = 0xffff;
 559
 560                         if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1, breakpoint->orig_instr)) != ERROR_OK)
 561                         {
 562                                 return retval;
 563                         }
 564                         if ((retval = target_write_u16(target, breakpoint->address, MIPS16_SDBBP)) != ERROR_OK)
 565                         {
 566                                 return retval;
 567                         }
 568
 569                         if ((retval = target_read_u16(target, breakpoint->address, &verify)) != ERROR_OK)
 570                         {
 571                                 return retval;
 572                         }
 573                         if (verify != MIPS16_SDBBP)
 574                         {
 575                                 LOG_ERROR("Unable to set 16bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
 576                                 return ERROR_OK;
 577                         }
 578                 }
 579
 580                 breakpoint->set = 20; /* Any nice value but 0 */
 581         }
 582
 583         return ERROR_OK;
 584 }
 585
 586 int mips_m4k_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
 587 {
 588         /* get pointers to arch-specific information */
 589         struct mips32_common *mips32 = target->arch_info;
 590         struct mips32_comparator * comparator_list = mips32->inst_break_list;
 591         int retval;
 592
 593         if (!breakpoint->set)
 594         {
 595                 LOG_WARNING("breakpoint not set");
 596                 return ERROR_OK;
 597         }
 598
 599         if (breakpoint->type == BKPT_HARD)
 600         {
 601                 int bp_num = breakpoint->set - 1;
 602                 if ((bp_num < 0) || (bp_num >= mips32->num_inst_bpoints))
 603                 {
 604                         LOG_DEBUG("Invalid FP Comparator number in breakpoint (bpid: %d)",
 605                                           breakpoint->unique_id);
 606                         return ERROR_OK;
 607                 }
 608                 LOG_DEBUG("bpid: %d - releasing hw: %d",
 609                                   breakpoint->unique_id,
 610                                   bp_num );
 611                 comparator_list[bp_num].used = 0;
 612                 comparator_list[bp_num].bp_value = 0;
 613                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 0);
 614
 615         }
 616         else
 617         {
 618                 /* restore original instruction (kept in target endianness) */
 619                 LOG_DEBUG("bpid: %d", breakpoint->unique_id);
 620                 if (breakpoint->length == 4)
 621                 {
 622                         uint32_t current_instr;
 623
 624                         /* check that user program has not modified breakpoint instruction */
 625                         if ((retval = target_read_memory(target, breakpoint->address, 4, 1, (uint8_t*)&current_instr)) != ERROR_OK)
 626                         {
 627                                 return retval;
 628                         }
 629                         if (current_instr == MIPS32_SDBBP)
 630                         {
 631                                 if ((retval = target_write_memory(target, breakpoint->address, 4, 1, breakpoint->orig_instr)) != ERROR_OK)
 632                                 {
 633                                         return retval;
 634                                 }
 635                         }
 636                 }
 637                 else
 638                 {
 639                         uint16_t current_instr;
 640
 641                         /* check that user program has not modified breakpoint instruction */
 642                         if ((retval = target_read_memory(target, breakpoint->address, 2, 1, (uint8_t*)&current_instr)) != ERROR_OK)
 643                         {
 644                                 return retval;
 645                         }
 646
 647                         if (current_instr == MIPS16_SDBBP)
 648                         {
 649                                 if ((retval = target_write_memory(target, breakpoint->address, 2, 1, breakpoint->orig_instr)) != ERROR_OK)
 650                                 {
 651                                         return retval;
 652                                 }
 653                         }
 654                 }
 655         }
 656         breakpoint->set = 0;
 657
 658         return ERROR_OK;
 659 }
 660
 661 int mips_m4k_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
 662 {
 663         struct mips32_common *mips32 = target->arch_info;
 664
 665         if (breakpoint->type == BKPT_HARD)
 666         {
 667                 if (mips32->num_inst_bpoints_avail < 1)
 668                 {
 669                         LOG_INFO("no hardware breakpoint available");
 670                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 671                 }
 672
 673                 mips32->num_inst_bpoints_avail--;
 674         }
 675
 676         mips_m4k_set_breakpoint(target, breakpoint);
 677
 678         return ERROR_OK;
 679 }
 680
 681 int mips_m4k_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
 682 {
 683         /* get pointers to arch-specific information */
 684         struct mips32_common *mips32 = target->arch_info;
 685
 686         if (target->state != TARGET_HALTED)
 687         {
 688                 LOG_WARNING("target not halted");
 689                 return ERROR_TARGET_NOT_HALTED;
 690         }
 691
 692         if (breakpoint->set)
 693         {
 694                 mips_m4k_unset_breakpoint(target, breakpoint);
 695         }
 696
 697         if (breakpoint->type == BKPT_HARD)
 698                 mips32->num_inst_bpoints_avail++;
 699
 700         return ERROR_OK;
 701 }
 702
 703 int mips_m4k_set_watchpoint(struct target *target, struct watchpoint *watchpoint)
 704 {
 705         struct mips32_common *mips32 = target->arch_info;
 706         struct mips32_comparator * comparator_list = mips32->data_break_list;
 707         int wp_num = 0;
 708         /*
 709          * watchpoint enabled, ignore all byte lanes in value register
 710          * and exclude both load and store accesses from  watchpoint
 711          * condition evaluation
 712         */
 713         int enable = EJTAG_DBCn_NOSB | EJTAG_DBCn_NOLB | EJTAG_DBCn_BE |
 714                 (0xff << EJTAG_DBCn_BLM_SHIFT);
 715
 716         if (watchpoint->set)
 717         {
 718                 LOG_WARNING("watchpoint already set");
 719                 return ERROR_OK;
 720         }
 721
 722         while(comparator_list[wp_num].used && (wp_num < mips32->num_data_bpoints))
 723                 wp_num++;
 724         if (wp_num >= mips32->num_data_bpoints)
 725         {
 726                 LOG_ERROR("Can not find free FP Comparator");
 727                 return ERROR_FAIL;
 728         }
 729
 730         if (watchpoint->length != 4)
 731         {
 732                 LOG_ERROR("Only watchpoints of length 4 are supported");
 733                 return ERROR_TARGET_UNALIGNED_ACCESS;
 734         }
 735
 736         if (watchpoint->address % 4)
 737         {
 738                 LOG_ERROR("Watchpoints address should be word aligned");
 739                 return ERROR_TARGET_UNALIGNED_ACCESS;
 740         }
 741
 742         switch (watchpoint->rw)
 743         {
 744                 case WPT_READ:
 745                         enable &= ~EJTAG_DBCn_NOLB;
 746                         break;
 747                 case WPT_WRITE:
 748                         enable &= ~EJTAG_DBCn_NOSB;
 749                         break;
 750                 case WPT_ACCESS:
 751                         enable &= ~(EJTAG_DBCn_NOLB | EJTAG_DBCn_NOSB);
 752                         break;
 753                 default:
 754                         LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
 755         }
 756
 757         watchpoint->set = wp_num + 1;
 758         comparator_list[wp_num].used = 1;
 759         comparator_list[wp_num].bp_value = watchpoint->address;
 760         target_write_u32(target, comparator_list[wp_num].reg_address, comparator_list[wp_num].bp_value);
 761         target_write_u32(target, comparator_list[wp_num].reg_address + 0x08, 0x00000000);
 762         target_write_u32(target, comparator_list[wp_num].reg_address + 0x10, 0x00000000);
 763         target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, enable);
 764         target_write_u32(target, comparator_list[wp_num].reg_address + 0x20, 0);
 765         LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "", wp_num, comparator_list[wp_num].bp_value);
 766
 767         return ERROR_OK;
 768 }
 769
 770 int mips_m4k_unset_watchpoint(struct target *target, struct watchpoint *watchpoint)
 771 {
 772         /* get pointers to arch-specific information */
 773         struct mips32_common *mips32 = target->arch_info;
 774         struct mips32_comparator * comparator_list = mips32->data_break_list;
 775
 776         if (!watchpoint->set)
 777         {
 778                 LOG_WARNING("watchpoint not set");
 779                 return ERROR_OK;
 780         }
 781
 782         int wp_num = watchpoint->set - 1;
 783         if ((wp_num < 0) || (wp_num >= mips32->num_data_bpoints))
 784         {
 785                 LOG_DEBUG("Invalid FP Comparator number in watchpoint");
 786                 return ERROR_OK;
 787         }
 788         comparator_list[wp_num].used = 0;
 789         comparator_list[wp_num].bp_value = 0;
 790         target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, 0);
 791         watchpoint->set = 0;
 792
 793         return ERROR_OK;
 794 }
 795
 796 int mips_m4k_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
 797 {
 798         struct mips32_common *mips32 = target->arch_info;
 799
 800         if (mips32->num_data_bpoints_avail < 1)
 801         {
 802                 LOG_INFO("no hardware watchpoints available");
 803                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 804         }
 805
 806         mips32->num_data_bpoints_avail--;
 807
 808         mips_m4k_set_watchpoint(target, watchpoint);
 809         return ERROR_OK;
 810 }
 811
 812 int mips_m4k_remove_watchpoint(struct target *target, struct watchpoint *watchpoint)
 813 {
 814         /* get pointers to arch-specific information */
 815         struct mips32_common *mips32 = target->arch_info;
 816
 817         if (target->state != TARGET_HALTED)
 818         {
 819                 LOG_WARNING("target not halted");
 820                 return ERROR_TARGET_NOT_HALTED;
 821         }
 822
 823         if (watchpoint->set)
 824         {
 825                 mips_m4k_unset_watchpoint(target, watchpoint);
 826         }
 827
 828         mips32->num_data_bpoints_avail++;
 829
 830         return ERROR_OK;
 831 }
 832
 833 void mips_m4k_enable_watchpoints(struct target *target)
 834 {
 835         struct watchpoint *watchpoint = target->watchpoints;
 836
 837         /* set any pending watchpoints */
 838         while (watchpoint)
 839         {
 840                 if (watchpoint->set == 0)
 841                         mips_m4k_set_watchpoint(target, watchpoint);
 842                 watchpoint = watchpoint->next;
 843         }
 844 }
 845
 846 int mips_m4k_read_memory(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 847 {
 848         struct mips32_common *mips32 = target->arch_info;
 849         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 850
 851         LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, size, count);
 852
 853         if (target->state != TARGET_HALTED)
 854         {
 855                 LOG_WARNING("target not halted");
 856                 return ERROR_TARGET_NOT_HALTED;
 857         }
 858
 859         /* sanitize arguments */
 860         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
 861                 return ERROR_INVALID_ARGUMENTS;
 862
 863         if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
 864                 return ERROR_TARGET_UNALIGNED_ACCESS;
 865
 866         /* if noDMA off, use DMAACC mode for memory read */
 867         int retval;
 868         if (ejtag_info->impcode & EJTAG_IMP_NODMA)
 869                 retval = mips32_pracc_read_mem(ejtag_info, address, size, count, (void *)buffer);
 870         else
 871                 retval = mips32_dmaacc_read_mem(ejtag_info, address, size, count, (void *)buffer);
 872         if (ERROR_OK != retval)
 873                 return retval;
 874
 875         return ERROR_OK;
 876 }
 877
 878 int mips_m4k_write_memory(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 879 {
 880         struct mips32_common *mips32 = target->arch_info;
 881         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 882
 883         LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, size, count);
 884
 885         if (target->state != TARGET_HALTED)
 886         {
 887                 LOG_WARNING("target not halted");
 888                 return ERROR_TARGET_NOT_HALTED;
 889         }
 890
 891         /* sanitize arguments */
 892         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
 893                 return ERROR_INVALID_ARGUMENTS;
 894
 895         if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
 896                 return ERROR_TARGET_UNALIGNED_ACCESS;
 897
 898         /* if noDMA off, use DMAACC mode for memory write */
 899         if (ejtag_info->impcode & EJTAG_IMP_NODMA)
 900                 return mips32_pracc_write_mem(ejtag_info, address, size, count, (void *)buffer);
 901         else
 902                 return mips32_dmaacc_write_mem(ejtag_info, address, size, count, (void *)buffer);
 903 }
 904
 905 int mips_m4k_register_commands(struct command_context *cmd_ctx)
 906 {
 907         int retval;
 908
 909         retval = mips32_register_commands(cmd_ctx);
 910         return retval;
 911 }
 912
 913 int mips_m4k_init_target(struct command_context *cmd_ctx, struct target *target)
 914 {
 915         mips32_build_reg_cache(target);
 916
 917         return ERROR_OK;
 918 }
 919
 920 int mips_m4k_init_arch_info(struct target *target, struct mips_m4k_common *mips_m4k, struct jtag_tap *tap)
 921 {
 922         struct mips32_common *mips32 = &mips_m4k->mips32_common;
 923
 924         mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
 925
 926         /* initialize mips4k specific info */
 927         mips32_init_arch_info(target, mips32, tap);
 928         mips32->arch_info = mips_m4k;
 929
 930         return ERROR_OK;
 931 }
 932
 933 int mips_m4k_target_create(struct target *target, Jim_Interp *interp)
 934 {
 935         struct mips_m4k_common *mips_m4k = calloc(1,sizeof(struct mips_m4k_common));
 936
 937         mips_m4k_init_arch_info(target, mips_m4k, target->tap);
 938
 939         return ERROR_OK;
 940 }
 941
 942 int mips_m4k_examine(struct target *target)
 943 {
 944         int retval;
 945         struct mips32_common *mips32 = target->arch_info;
 946         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 947         uint32_t idcode = 0;
 948
 949         if (!target_was_examined(target))
 950         {
 951                 mips_ejtag_get_idcode(ejtag_info, &idcode);
 952                 ejtag_info->idcode = idcode;
 953
 954                 if (((idcode >> 1) & 0x7FF) == 0x29)
 955                 {
 956                         /* we are using a pic32mx so select ejtag port
 957                          * as it is not selected by default */
 958                         mips_ejtag_set_instr(ejtag_info, 0x05, NULL);
 959                         LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
 960                 }
 961         }
 962
 963         /* init rest of ejtag interface */
 964         if ((retval = mips_ejtag_init(ejtag_info)) != ERROR_OK)
 965                 return retval;
 966
 967         if ((retval = mips32_examine(target)) != ERROR_OK)
 968                 return retval;
 969
 970         return ERROR_OK;
 971 }
 972
 973 int mips_m4k_bulk_write_memory(struct target *target, uint32_t address, uint32_t count, uint8_t *buffer)
 974 {
 975         return mips_m4k_write_memory(target, address, 4, count, buffer);
 976 }
 977
 978 int mips_m4k_checksum_memory(struct target *target, uint32_t address, uint32_t size, uint32_t *checksum)
 979 {
 980         return ERROR_FAIL; /* use bulk read method */
 981 }