git.gag.com Git - fw/openocd/blob - src/target/mips_m4k.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) 2009 by David N. Claffey <dnclaffey@gmail.com>          *
   8  *                                                                         *
   9  *   This program is free software; you can redistribute it and/or modify  *
  10  *   it under the terms of the GNU General Public License as published by  *
  11  *   the Free Software Foundation; either version 2 of the License, or     *
  12  *   (at your option) any later version.                                   *
  13  *                                                                         *
  14  *   This program is distributed in the hope that it will be useful,       *
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  17  *   GNU General Public License for more details.                          *
  18  *                                                                         *
  19  *   You should have received a copy of the GNU General Public License     *
  20  *   along with this program; if not, write to the                         *
  21  *   Free Software Foundation, Inc.,                                       *
  22  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  23  ***************************************************************************/
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include "breakpoints.h"
  29 #include "mips32.h"
  30 #include "mips_m4k.h"
  31 #include "mips32_dmaacc.h"
  32 #include "target_type.h"
  33 #include "register.h"
  34
  35 static void mips_m4k_enable_breakpoints(struct target *target);
  36 static void mips_m4k_enable_watchpoints(struct target *target);
  37 static int mips_m4k_set_breakpoint(struct target *target,
  38                 struct breakpoint *breakpoint);
  39 static int mips_m4k_unset_breakpoint(struct target *target,
  40                 struct breakpoint *breakpoint);
  41
  42 static int mips_m4k_examine_debug_reason(struct target *target)
  43 {
  44         uint32_t break_status;
  45         int retval;
  46
  47         if ((target->debug_reason != DBG_REASON_DBGRQ)
  48                 && (target->debug_reason != DBG_REASON_SINGLESTEP))
  49         {
  50                 /* get info about inst breakpoint support */
  51                 if ((retval = target_read_u32(target, EJTAG_IBS, &break_status)) != ERROR_OK)
  52                         return retval;
  53                 if (break_status & 0x1f)
  54                 {
  55                         /* we have halted on a  breakpoint */
  56                         if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
  57                                 return retval;
  58                         target->debug_reason = DBG_REASON_BREAKPOINT;
  59                 }
  60
  61                 /* get info about data breakpoint support */
  62                 if ((retval = target_read_u32(target, EJTAG_DBS, &break_status)) != ERROR_OK)
  63                         return retval;
  64                 if (break_status & 0x1f)
  65                 {
  66                         /* we have halted on a  breakpoint */
  67                         if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
  68                                 return retval;
  69                         target->debug_reason = DBG_REASON_WATCHPOINT;
  70                 }
  71         }
  72
  73         return ERROR_OK;
  74 }
  75
  76 static int mips_m4k_debug_entry(struct target *target)
  77 {
  78         struct mips32_common *mips32 = target_to_mips32(target);
  79         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
  80         uint32_t debug_reg;
  81
  82         /* read debug register */
  83         mips_ejtag_read_debug(ejtag_info, &debug_reg);
  84
  85         /* make sure break unit configured */
  86         mips32_configure_break_unit(target);
  87
  88         /* attempt to find halt reason */
  89         mips_m4k_examine_debug_reason(target);
  90
  91         /* clear single step if active */
  92         if (debug_reg & EJTAG_DEBUG_DSS)
  93         {
  94                 /* stopped due to single step - clear step bit */
  95                 mips_ejtag_config_step(ejtag_info, 0);
  96         }
  97
  98         mips32_save_context(target);
  99
 100         /* default to mips32 isa, it will be changed below if required */
 101         mips32->isa_mode = MIPS32_ISA_MIPS32;
 102
 103         if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
 104                 mips32->isa_mode = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1);
 105         }
 106
 107         LOG_DEBUG("entered debug state at PC 0x%" PRIx32 ", target->state: %s",
 108                         buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32),
 109                         target_state_name(target));
 110
 111         return ERROR_OK;
 112 }
 113
 114 static int mips_m4k_poll(struct target *target)
 115 {
 116         int retval;
 117         struct mips32_common *mips32 = target_to_mips32(target);
 118         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 119         uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl;
 120
 121         /* read ejtag control reg */
 122         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
 123         mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
 124
 125         /* clear this bit before handling polling
 126          * as after reset registers will read zero */
 127         if (ejtag_ctrl & EJTAG_CTRL_ROCC)
 128         {
 129                 /* we have detected a reset, clear flag
 130                  * otherwise ejtag will not work */
 131                 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_ROCC;
 132
 133                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
 134                 mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
 135                 LOG_DEBUG("Reset Detected");
 136         }
 137
 138         /* check for processor halted */
 139         if (ejtag_ctrl & EJTAG_CTRL_BRKST)
 140         {
 141                 if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
 142                 {
 143                         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
 144
 145                         target->state = TARGET_HALTED;
 146
 147                         if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
 148                                 return retval;
 149
 150                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 151                 }
 152                 else if (target->state == TARGET_DEBUG_RUNNING)
 153                 {
 154                         target->state = TARGET_HALTED;
 155
 156                         if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
 157                                 return retval;
 158
 159                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 160                 }
 161         }
 162         else
 163         {
 164                 target->state = TARGET_RUNNING;
 165         }
 166
 167 //      LOG_DEBUG("ctrl = 0x%08X", ejtag_ctrl);
 168
 169         return ERROR_OK;
 170 }
 171
 172 static int mips_m4k_halt(struct target *target)
 173 {
 174         struct mips32_common *mips32 = target_to_mips32(target);
 175         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 176
 177         LOG_DEBUG("target->state: %s",
 178                   target_state_name(target));
 179
 180         if (target->state == TARGET_HALTED)
 181         {
 182                 LOG_DEBUG("target was already halted");
 183                 return ERROR_OK;
 184         }
 185
 186         if (target->state == TARGET_UNKNOWN)
 187         {
 188                 LOG_WARNING("target was in unknown state when halt was requested");
 189         }
 190
 191         if (target->state == TARGET_RESET)
 192         {
 193                 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst())
 194                 {
 195                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 196                         return ERROR_TARGET_FAILURE;
 197                 }
 198                 else
 199                 {
 200                         /* we came here in a reset_halt or reset_init sequence
 201                          * debug entry was already prepared in mips32_prepare_reset_halt()
 202                          */
 203                         target->debug_reason = DBG_REASON_DBGRQ;
 204
 205                         return ERROR_OK;
 206                 }
 207         }
 208
 209         /* break processor */
 210         mips_ejtag_enter_debug(ejtag_info);
 211
 212         target->debug_reason = DBG_REASON_DBGRQ;
 213
 214         return ERROR_OK;
 215 }
 216
 217 static int mips_m4k_assert_reset(struct target *target)
 218 {
 219         struct mips_m4k_common *mips_m4k = target_to_m4k(target);
 220         struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
 221         int assert_srst = 1;
 222
 223         LOG_DEBUG("target->state: %s",
 224                 target_state_name(target));
 225
 226         enum reset_types jtag_reset_config = jtag_get_reset_config();
 227
 228         if (!(jtag_reset_config & RESET_HAS_SRST))
 229                 assert_srst = 0;
 230
 231         if (target->reset_halt)
 232         {
 233                 /* use hardware to catch reset */
 234                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT);
 235         }
 236         else
 237         {
 238                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
 239         }
 240
 241         if (assert_srst)
 242         {
 243                 /* here we should issue a srst only, but we may have to assert trst as well */
 244                 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 245                 {
 246                         jtag_add_reset(1, 1);
 247                 }
 248                 else
 249                 {
 250                         jtag_add_reset(0, 1);
 251                 }
 252         }
 253         else
 254         {
 255                 if (mips_m4k->is_pic32mx)
 256                 {
 257                         uint32_t mchip_cmd;
 258
 259                         LOG_DEBUG("Using MTAP reset to reset processor...");
 260
 261                         /* use microchip specific MTAP reset */
 262                         mips_ejtag_set_instr(ejtag_info, MTAP_SW_MTAP);
 263                         mips_ejtag_set_instr(ejtag_info, MTAP_COMMAND);
 264
 265                         mchip_cmd = MCHP_ASERT_RST;
 266                         mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
 267                         mchip_cmd = MCHP_DE_ASSERT_RST;
 268                         mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
 269                         mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
 270                 }
 271                 else
 272                 {
 273                         /* use ejtag reset - not supported by all cores */
 274                         uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_PRRST | EJTAG_CTRL_PERRST;
 275                         LOG_DEBUG("Using EJTAG reset (PRRST) to reset processor...");
 276                         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
 277                         mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
 278                 }
 279         }
 280
 281         target->state = TARGET_RESET;
 282         jtag_add_sleep(50000);
 283
 284         register_cache_invalidate(mips_m4k->mips32.core_cache);
 285
 286         if (target->reset_halt)
 287         {
 288                 int retval;
 289                 if ((retval = target_halt(target)) != ERROR_OK)
 290                         return retval;
 291         }
 292
 293         return ERROR_OK;
 294 }
 295
 296 static int mips_m4k_deassert_reset(struct target *target)
 297 {
 298         LOG_DEBUG("target->state: %s",
 299                 target_state_name(target));
 300
 301         /* deassert reset lines */
 302         jtag_add_reset(0, 0);
 303
 304         return ERROR_OK;
 305 }
 306
 307 static int mips_m4k_soft_reset_halt(struct target *target)
 308 {
 309         /* TODO */
 310         return ERROR_OK;
 311 }
 312
 313 static int mips_m4k_single_step_core(struct target *target)
 314 {
 315         struct mips32_common *mips32 = target_to_mips32(target);
 316         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 317
 318         /* configure single step mode */
 319         mips_ejtag_config_step(ejtag_info, 1);
 320
 321         /* disable interrupts while stepping */
 322         mips32_enable_interrupts(target, 0);
 323
 324         /* exit debug mode */
 325         mips_ejtag_exit_debug(ejtag_info);
 326
 327         mips_m4k_debug_entry(target);
 328
 329         return ERROR_OK;
 330 }
 331
 332 static int mips_m4k_resume(struct target *target, int current,
 333                 uint32_t address, int handle_breakpoints, int debug_execution)
 334 {
 335         struct mips32_common *mips32 = target_to_mips32(target);
 336         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 337         struct breakpoint *breakpoint = NULL;
 338         uint32_t resume_pc;
 339
 340         if (target->state != TARGET_HALTED)
 341         {
 342                 LOG_WARNING("target not halted");
 343                 return ERROR_TARGET_NOT_HALTED;
 344         }
 345
 346         if (!debug_execution)
 347         {
 348                 target_free_all_working_areas(target);
 349                 mips_m4k_enable_breakpoints(target);
 350                 mips_m4k_enable_watchpoints(target);
 351         }
 352
 353         /* current = 1: continue on current pc, otherwise continue at <address> */
 354         if (!current)
 355         {
 356                 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
 357                 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
 358                 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
 359         }
 360
 361         if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
 362                 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1, mips32->isa_mode);
 363         }
 364
 365         resume_pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
 366
 367         mips32_restore_context(target);
 368
 369         /* the front-end may request us not to handle breakpoints */
 370         if (handle_breakpoints)
 371         {
 372                 /* Single step past breakpoint at current address */
 373                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 374                 {
 375                         LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 "", breakpoint->address);
 376                         mips_m4k_unset_breakpoint(target, breakpoint);
 377                         mips_m4k_single_step_core(target);
 378                         mips_m4k_set_breakpoint(target, breakpoint);
 379                 }
 380         }
 381
 382         /* enable interrupts if we are running */
 383         mips32_enable_interrupts(target, !debug_execution);
 384
 385         /* exit debug mode */
 386         mips_ejtag_exit_debug(ejtag_info);
 387         target->debug_reason = DBG_REASON_NOTHALTED;
 388
 389         /* registers are now invalid */
 390         register_cache_invalidate(mips32->core_cache);
 391
 392         if (!debug_execution)
 393         {
 394                 target->state = TARGET_RUNNING;
 395                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 396                 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
 397         }
 398         else
 399         {
 400                 target->state = TARGET_DEBUG_RUNNING;
 401                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 402                 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
 403         }
 404
 405         return ERROR_OK;
 406 }
 407
 408 static int mips_m4k_step(struct target *target, int current,
 409                 uint32_t address, int handle_breakpoints)
 410 {
 411         /* get pointers to arch-specific information */
 412         struct mips32_common *mips32 = target_to_mips32(target);
 413         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 414         struct breakpoint *breakpoint = NULL;
 415
 416         if (target->state != TARGET_HALTED)
 417         {
 418                 LOG_WARNING("target not halted");
 419                 return ERROR_TARGET_NOT_HALTED;
 420         }
 421
 422         /* current = 1: continue on current pc, otherwise continue at <address> */
 423         if (!current)
 424         {
 425                 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
 426                 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
 427                 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
 428         }
 429
 430         /* the front-end may request us not to handle breakpoints */
 431         if (handle_breakpoints) {
 432                 breakpoint = breakpoint_find(target,
 433                                 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
 434                 if (breakpoint)
 435                         mips_m4k_unset_breakpoint(target, breakpoint);
 436         }
 437
 438         /* restore context */
 439         mips32_restore_context(target);
 440
 441         /* configure single step mode */
 442         mips_ejtag_config_step(ejtag_info, 1);
 443
 444         target->debug_reason = DBG_REASON_SINGLESTEP;
 445
 446         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 447
 448         /* disable interrupts while stepping */
 449         mips32_enable_interrupts(target, 0);
 450
 451         /* exit debug mode */
 452         mips_ejtag_exit_debug(ejtag_info);
 453
 454         /* registers are now invalid */
 455         register_cache_invalidate(mips32->core_cache);
 456
 457         if (breakpoint)
 458                 mips_m4k_set_breakpoint(target, breakpoint);
 459
 460         LOG_DEBUG("target stepped ");
 461
 462         mips_m4k_debug_entry(target);
 463         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 464
 465         return ERROR_OK;
 466 }
 467
 468 static void mips_m4k_enable_breakpoints(struct target *target)
 469 {
 470         struct breakpoint *breakpoint = target->breakpoints;
 471
 472         /* set any pending breakpoints */
 473         while (breakpoint)
 474         {
 475                 if (breakpoint->set == 0)
 476                         mips_m4k_set_breakpoint(target, breakpoint);
 477                 breakpoint = breakpoint->next;
 478         }
 479 }
 480
 481 static int mips_m4k_set_breakpoint(struct target *target,
 482                 struct breakpoint *breakpoint)
 483 {
 484         struct mips32_common *mips32 = target_to_mips32(target);
 485         struct mips32_comparator * comparator_list = mips32->inst_break_list;
 486         int retval;
 487
 488         if (breakpoint->set)
 489         {
 490                 LOG_WARNING("breakpoint already set");
 491                 return ERROR_OK;
 492         }
 493
 494         if (breakpoint->type == BKPT_HARD)
 495         {
 496                 int bp_num = 0;
 497
 498                 while (comparator_list[bp_num].used && (bp_num < mips32->num_inst_bpoints))
 499                         bp_num++;
 500                 if (bp_num >= mips32->num_inst_bpoints)
 501                 {
 502                         LOG_ERROR("Can not find free FP Comparator(bpid: %d)",
 503                                           breakpoint->unique_id );
 504                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 505                 }
 506                 breakpoint->set = bp_num + 1;
 507                 comparator_list[bp_num].used = 1;
 508                 comparator_list[bp_num].bp_value = breakpoint->address;
 509                 target_write_u32(target, comparator_list[bp_num].reg_address, comparator_list[bp_num].bp_value);
 510                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x08, 0x00000000);
 511                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 1);
 512                 LOG_DEBUG("bpid: %d, bp_num %i bp_value 0x%" PRIx32 "",
 513                                   breakpoint->unique_id,
 514                                   bp_num, comparator_list[bp_num].bp_value);
 515         }
 516         else if (breakpoint->type == BKPT_SOFT)
 517         {
 518                 LOG_DEBUG("bpid: %d", breakpoint->unique_id );
 519                 if (breakpoint->length == 4)
 520                 {
 521                         uint32_t verify = 0xffffffff;
 522
 523                         if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
 524                                         breakpoint->orig_instr)) != ERROR_OK)
 525                         {
 526                                 return retval;
 527                         }
 528                         if ((retval = target_write_u32(target, breakpoint->address, MIPS32_SDBBP)) != ERROR_OK)
 529                         {
 530                                 return retval;
 531                         }
 532
 533                         if ((retval = target_read_u32(target, breakpoint->address, &verify)) != ERROR_OK)
 534                         {
 535                                 return retval;
 536                         }
 537                         if (verify != MIPS32_SDBBP)
 538                         {
 539                                 LOG_ERROR("Unable to set 32bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
 540                                 return ERROR_OK;
 541                         }
 542                 }
 543                 else
 544                 {
 545                         uint16_t verify = 0xffff;
 546
 547                         if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
 548                                         breakpoint->orig_instr)) != ERROR_OK)
 549                         {
 550                                 return retval;
 551                         }
 552                         if ((retval = target_write_u16(target, breakpoint->address, MIPS16_SDBBP)) != ERROR_OK)
 553                         {
 554                                 return retval;
 555                         }
 556
 557                         if ((retval = target_read_u16(target, breakpoint->address, &verify)) != ERROR_OK)
 558                         {
 559                                 return retval;
 560                         }
 561                         if (verify != MIPS16_SDBBP)
 562                         {
 563                                 LOG_ERROR("Unable to set 16bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
 564                                 return ERROR_OK;
 565                         }
 566                 }
 567
 568                 breakpoint->set = 20; /* Any nice value but 0 */
 569         }
 570
 571         return ERROR_OK;
 572 }
 573
 574 static int mips_m4k_unset_breakpoint(struct target *target,
 575                 struct breakpoint *breakpoint)
 576 {
 577         /* get pointers to arch-specific information */
 578         struct mips32_common *mips32 = target_to_mips32(target);
 579         struct mips32_comparator *comparator_list = mips32->inst_break_list;
 580         int retval;
 581
 582         if (!breakpoint->set)
 583         {
 584                 LOG_WARNING("breakpoint not set");
 585                 return ERROR_OK;
 586         }
 587
 588         if (breakpoint->type == BKPT_HARD)
 589         {
 590                 int bp_num = breakpoint->set - 1;
 591                 if ((bp_num < 0) || (bp_num >= mips32->num_inst_bpoints))
 592                 {
 593                         LOG_DEBUG("Invalid FP Comparator number in breakpoint (bpid: %d)",
 594                                           breakpoint->unique_id);
 595                         return ERROR_OK;
 596                 }
 597                 LOG_DEBUG("bpid: %d - releasing hw: %d",
 598                                   breakpoint->unique_id,
 599                                   bp_num );
 600                 comparator_list[bp_num].used = 0;
 601                 comparator_list[bp_num].bp_value = 0;
 602                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 0);
 603
 604         }
 605         else
 606         {
 607                 /* restore original instruction (kept in target endianness) */
 608                 LOG_DEBUG("bpid: %d", breakpoint->unique_id);
 609                 if (breakpoint->length == 4)
 610                 {
 611                         uint32_t current_instr;
 612
 613                         /* check that user program has not modified breakpoint instruction */
 614                         if ((retval = target_read_memory(target, breakpoint->address, 4, 1,
 615                                         (uint8_t*)&current_instr)) != ERROR_OK)
 616                         {
 617                                 return retval;
 618                         }
 619                         if (current_instr == MIPS32_SDBBP)
 620                         {
 621                                 if ((retval = target_write_memory(target, breakpoint->address, 4, 1,
 622                                                 breakpoint->orig_instr)) != ERROR_OK)
 623                                 {
 624                                         return retval;
 625                                 }
 626                         }
 627                 }
 628                 else
 629                 {
 630                         uint16_t current_instr;
 631
 632                         /* check that user program has not modified breakpoint instruction */
 633                         if ((retval = target_read_memory(target, breakpoint->address, 2, 1,
 634                                         (uint8_t*)&current_instr)) != ERROR_OK)
 635                         {
 636                                 return retval;
 637                         }
 638
 639                         if (current_instr == MIPS16_SDBBP)
 640                         {
 641                                 if ((retval = target_write_memory(target, breakpoint->address, 2, 1,
 642                                                 breakpoint->orig_instr)) != ERROR_OK)
 643                                 {
 644                                         return retval;
 645                                 }
 646                         }
 647                 }
 648         }
 649         breakpoint->set = 0;
 650
 651         return ERROR_OK;
 652 }
 653
 654 static int mips_m4k_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
 655 {
 656         struct mips32_common *mips32 = target_to_mips32(target);
 657
 658         if (breakpoint->type == BKPT_HARD)
 659         {
 660                 if (mips32->num_inst_bpoints_avail < 1)
 661                 {
 662                         LOG_INFO("no hardware breakpoint available");
 663                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 664                 }
 665
 666                 mips32->num_inst_bpoints_avail--;
 667         }
 668
 669         return mips_m4k_set_breakpoint(target, breakpoint);
 670 }
 671
 672 static int mips_m4k_remove_breakpoint(struct target *target,
 673                 struct breakpoint *breakpoint)
 674 {
 675         /* get pointers to arch-specific information */
 676         struct mips32_common *mips32 = target_to_mips32(target);
 677
 678         if (target->state != TARGET_HALTED)
 679         {
 680                 LOG_WARNING("target not halted");
 681                 return ERROR_TARGET_NOT_HALTED;
 682         }
 683
 684         if (breakpoint->set)
 685         {
 686                 mips_m4k_unset_breakpoint(target, breakpoint);
 687         }
 688
 689         if (breakpoint->type == BKPT_HARD)
 690                 mips32->num_inst_bpoints_avail++;
 691
 692         return ERROR_OK;
 693 }
 694
 695 static int mips_m4k_set_watchpoint(struct target *target,
 696                 struct watchpoint *watchpoint)
 697 {
 698         struct mips32_common *mips32 = target_to_mips32(target);
 699         struct mips32_comparator *comparator_list = mips32->data_break_list;
 700         int wp_num = 0;
 701         /*
 702          * watchpoint enabled, ignore all byte lanes in value register
 703          * and exclude both load and store accesses from  watchpoint
 704          * condition evaluation
 705         */
 706         int enable = EJTAG_DBCn_NOSB | EJTAG_DBCn_NOLB | EJTAG_DBCn_BE |
 707                 (0xff << EJTAG_DBCn_BLM_SHIFT);
 708
 709         if (watchpoint->set)
 710         {
 711                 LOG_WARNING("watchpoint already set");
 712                 return ERROR_OK;
 713         }
 714
 715         while(comparator_list[wp_num].used && (wp_num < mips32->num_data_bpoints))
 716                 wp_num++;
 717         if (wp_num >= mips32->num_data_bpoints)
 718         {
 719                 LOG_ERROR("Can not find free FP Comparator");
 720                 return ERROR_FAIL;
 721         }
 722
 723         if (watchpoint->length != 4)
 724         {
 725                 LOG_ERROR("Only watchpoints of length 4 are supported");
 726                 return ERROR_TARGET_UNALIGNED_ACCESS;
 727         }
 728
 729         if (watchpoint->address % 4)
 730         {
 731                 LOG_ERROR("Watchpoints address should be word aligned");
 732                 return ERROR_TARGET_UNALIGNED_ACCESS;
 733         }
 734
 735         switch (watchpoint->rw)
 736         {
 737                 case WPT_READ:
 738                         enable &= ~EJTAG_DBCn_NOLB;
 739                         break;
 740                 case WPT_WRITE:
 741                         enable &= ~EJTAG_DBCn_NOSB;
 742                         break;
 743                 case WPT_ACCESS:
 744                         enable &= ~(EJTAG_DBCn_NOLB | EJTAG_DBCn_NOSB);
 745                         break;
 746                 default:
 747                         LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
 748         }
 749
 750         watchpoint->set = wp_num + 1;
 751         comparator_list[wp_num].used = 1;
 752         comparator_list[wp_num].bp_value = watchpoint->address;
 753         target_write_u32(target, comparator_list[wp_num].reg_address, comparator_list[wp_num].bp_value);
 754         target_write_u32(target, comparator_list[wp_num].reg_address + 0x08, 0x00000000);
 755         target_write_u32(target, comparator_list[wp_num].reg_address + 0x10, 0x00000000);
 756         target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, enable);
 757         target_write_u32(target, comparator_list[wp_num].reg_address + 0x20, 0);
 758         LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "", wp_num, comparator_list[wp_num].bp_value);
 759
 760         return ERROR_OK;
 761 }
 762
 763 static int mips_m4k_unset_watchpoint(struct target *target,
 764                 struct watchpoint *watchpoint)
 765 {
 766         /* get pointers to arch-specific information */
 767         struct mips32_common *mips32 = target_to_mips32(target);
 768         struct mips32_comparator *comparator_list = mips32->data_break_list;
 769
 770         if (!watchpoint->set)
 771         {
 772                 LOG_WARNING("watchpoint not set");
 773                 return ERROR_OK;
 774         }
 775
 776         int wp_num = watchpoint->set - 1;
 777         if ((wp_num < 0) || (wp_num >= mips32->num_data_bpoints))
 778         {
 779                 LOG_DEBUG("Invalid FP Comparator number in watchpoint");
 780                 return ERROR_OK;
 781         }
 782         comparator_list[wp_num].used = 0;
 783         comparator_list[wp_num].bp_value = 0;
 784         target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, 0);
 785         watchpoint->set = 0;
 786
 787         return ERROR_OK;
 788 }
 789
 790 static int mips_m4k_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
 791 {
 792         struct mips32_common *mips32 = target_to_mips32(target);
 793
 794         if (mips32->num_data_bpoints_avail < 1)
 795         {
 796                 LOG_INFO("no hardware watchpoints available");
 797                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 798         }
 799
 800         mips32->num_data_bpoints_avail--;
 801
 802         mips_m4k_set_watchpoint(target, watchpoint);
 803         return ERROR_OK;
 804 }
 805
 806 static int mips_m4k_remove_watchpoint(struct target *target,
 807                 struct watchpoint *watchpoint)
 808 {
 809         /* get pointers to arch-specific information */
 810         struct mips32_common *mips32 = target_to_mips32(target);
 811
 812         if (target->state != TARGET_HALTED)
 813         {
 814                 LOG_WARNING("target not halted");
 815                 return ERROR_TARGET_NOT_HALTED;
 816         }
 817
 818         if (watchpoint->set)
 819         {
 820                 mips_m4k_unset_watchpoint(target, watchpoint);
 821         }
 822
 823         mips32->num_data_bpoints_avail++;
 824
 825         return ERROR_OK;
 826 }
 827
 828 static void mips_m4k_enable_watchpoints(struct target *target)
 829 {
 830         struct watchpoint *watchpoint = target->watchpoints;
 831
 832         /* set any pending watchpoints */
 833         while (watchpoint)
 834         {
 835                 if (watchpoint->set == 0)
 836                         mips_m4k_set_watchpoint(target, watchpoint);
 837                 watchpoint = watchpoint->next;
 838         }
 839 }
 840
 841 static int mips_m4k_read_memory(struct target *target, uint32_t address,
 842                 uint32_t size, uint32_t count, uint8_t *buffer)
 843 {
 844         struct mips32_common *mips32 = target_to_mips32(target);
 845         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 846
 847         LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, size, count);
 848
 849         if (target->state != TARGET_HALTED)
 850         {
 851                 LOG_WARNING("target not halted");
 852                 return ERROR_TARGET_NOT_HALTED;
 853         }
 854
 855         /* sanitize arguments */
 856         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
 857                 return ERROR_INVALID_ARGUMENTS;
 858
 859         if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
 860                 return ERROR_TARGET_UNALIGNED_ACCESS;
 861
 862         /* if noDMA off, use DMAACC mode for memory read */
 863         int retval;
 864         if (ejtag_info->impcode & EJTAG_IMP_NODMA)
 865                 retval = mips32_pracc_read_mem(ejtag_info, address, size, count, (void *)buffer);
 866         else
 867                 retval = mips32_dmaacc_read_mem(ejtag_info, address, size, count, (void *)buffer);
 868         if (ERROR_OK != retval)
 869                 return retval;
 870
 871         return ERROR_OK;
 872 }
 873
 874 static int mips_m4k_write_memory(struct target *target, uint32_t address,
 875                 uint32_t size, uint32_t count, uint8_t *buffer)
 876 {
 877         struct mips32_common *mips32 = target_to_mips32(target);
 878         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 879
 880         LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "",
 881                         address, size, count);
 882
 883         if (target->state != TARGET_HALTED)
 884         {
 885                 LOG_WARNING("target not halted");
 886                 return ERROR_TARGET_NOT_HALTED;
 887         }
 888
 889         /* sanitize arguments */
 890         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
 891                 return ERROR_INVALID_ARGUMENTS;
 892
 893         if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
 894                 return ERROR_TARGET_UNALIGNED_ACCESS;
 895
 896         /* if noDMA off, use DMAACC mode for memory write */
 897         if (ejtag_info->impcode & EJTAG_IMP_NODMA)
 898                 return mips32_pracc_write_mem(ejtag_info, address, size, count, (void *)buffer);
 899         else
 900                 return mips32_dmaacc_write_mem(ejtag_info, address, size, count, (void *)buffer);
 901 }
 902
 903 static int mips_m4k_init_target(struct command_context *cmd_ctx,
 904                 struct target *target)
 905 {
 906         mips32_build_reg_cache(target);
 907
 908         return ERROR_OK;
 909 }
 910
 911 static int mips_m4k_init_arch_info(struct target *target,
 912                 struct mips_m4k_common *mips_m4k, struct jtag_tap *tap)
 913 {
 914         struct mips32_common *mips32 = &mips_m4k->mips32;
 915
 916         mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
 917
 918         /* initialize mips4k specific info */
 919         mips32_init_arch_info(target, mips32, tap);
 920         mips32->arch_info = mips_m4k;
 921
 922         return ERROR_OK;
 923 }
 924
 925 static int mips_m4k_target_create(struct target *target, Jim_Interp *interp)
 926 {
 927         struct mips_m4k_common *mips_m4k = calloc(1, sizeof(struct mips_m4k_common));
 928
 929         mips_m4k_init_arch_info(target, mips_m4k, target->tap);
 930
 931         return ERROR_OK;
 932 }
 933
 934 static int mips_m4k_examine(struct target *target)
 935 {
 936         int retval;
 937         struct mips_m4k_common *mips_m4k = target_to_m4k(target);
 938         struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
 939         uint32_t idcode = 0;
 940
 941         if (!target_was_examined(target))
 942         {
 943                 mips_ejtag_get_idcode(ejtag_info, &idcode);
 944                 ejtag_info->idcode = idcode;
 945
 946                 if (((idcode >> 1) & 0x7FF) == 0x29)
 947                 {
 948                         /* we are using a pic32mx so select ejtag port
 949                          * as it is not selected by default */
 950                         mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
 951                         LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
 952                         mips_m4k->is_pic32mx = true;
 953                 }
 954         }
 955
 956         /* init rest of ejtag interface */
 957         if ((retval = mips_ejtag_init(ejtag_info)) != ERROR_OK)
 958                 return retval;
 959
 960         if ((retval = mips32_examine(target)) != ERROR_OK)
 961                 return retval;
 962
 963         return ERROR_OK;
 964 }
 965
 966 static int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
 967                 uint32_t count, uint8_t *buffer)
 968 {
 969         struct mips32_common *mips32 = target_to_mips32(target);
 970         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 971         int retval;
 972         int write_t = 1;
 973
 974         LOG_DEBUG("address: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, count);
 975
 976         if (target->state != TARGET_HALTED)
 977         {
 978                 LOG_WARNING("target not halted");
 979                 return ERROR_TARGET_NOT_HALTED;
 980         }
 981
 982         /* check alignment */
 983         if (address & 0x3u)
 984                 return ERROR_TARGET_UNALIGNED_ACCESS;
 985
 986         if (mips32->fast_data_area == NULL)
 987         {
 988                 /* Get memory for block write handler
 989                  * we preserve this area between calls and gain a speed increase
 990                  * of about 3kb/sec when writing flash
 991                  * this will be released/nulled by the system when the target is resumed or reset */
 992                 retval = target_alloc_working_area(target,
 993                                 MIPS32_FASTDATA_HANDLER_SIZE,
 994                                 &mips32->fast_data_area);
 995                 if (retval != ERROR_OK)
 996                 {
 997                         LOG_WARNING("No working area available, falling back to non-bulk write");
 998                         return mips_m4k_write_memory(target, address, 4, count, buffer);
 999                 }
1000
1001                 /* reset fastadata state so the algo get reloaded */
1002                 ejtag_info->fast_access_save = -1;
1003         }
1004
1005         /* TAP data register is loaded LSB first (little endian) */
1006         if (target->endianness == TARGET_BIG_ENDIAN)
1007         {
1008                 uint32_t i, t32;
1009                 for(i = 0; i < (count * 4); i += 4)
1010                 {
1011                         t32 = be_to_h_u32((uint8_t *) &buffer[i]);
1012                         h_u32_to_le(&buffer[i], t32);
1013                 }
1014         }
1015
1016         retval = mips32_pracc_fastdata_xfer(ejtag_info, mips32->fast_data_area, write_t, address,
1017                         count, (uint32_t*) (void *)buffer);
1018         if (retval != ERROR_OK)
1019         {
1020                 /* FASTDATA access failed, try normal memory write */
1021                 LOG_DEBUG("Fastdata access Failed, falling back to non-bulk write");
1022                 retval = mips_m4k_write_memory(target, address, 4, count, buffer);
1023         }
1024
1025         return retval;
1026 }
1027
1028 struct target_type mips_m4k_target =
1029 {
1030         .name = "mips_m4k",
1031
1032         .poll = mips_m4k_poll,
1033         .arch_state = mips32_arch_state,
1034
1035         .target_request_data = NULL,
1036
1037         .halt = mips_m4k_halt,
1038         .resume = mips_m4k_resume,
1039         .step = mips_m4k_step,
1040
1041         .assert_reset = mips_m4k_assert_reset,
1042         .deassert_reset = mips_m4k_deassert_reset,
1043         .soft_reset_halt = mips_m4k_soft_reset_halt,
1044
1045         .get_gdb_reg_list = mips32_get_gdb_reg_list,
1046
1047         .read_memory = mips_m4k_read_memory,
1048         .write_memory = mips_m4k_write_memory,
1049         .bulk_write_memory = mips_m4k_bulk_write_memory,
1050         .checksum_memory = mips32_checksum_memory,
1051         .blank_check_memory = mips32_blank_check_memory,
1052
1053         .run_algorithm = mips32_run_algorithm,
1054
1055         .add_breakpoint = mips_m4k_add_breakpoint,
1056         .remove_breakpoint = mips_m4k_remove_breakpoint,
1057         .add_watchpoint = mips_m4k_add_watchpoint,
1058         .remove_watchpoint = mips_m4k_remove_watchpoint,
1059
1060         .target_create = mips_m4k_target_create,
1061         .init_target = mips_m4k_init_target,
1062         .examine = mips_m4k_examine,
1063 };