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