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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  *   Copyright (C) 2009 by David N. Claffey <dnclaffey@gmail.com>          *
   8  *                                                                         *
   9  *   Copyright (C) 2011 by Drasko DRASKOVIC                                *
  10  *   drasko.draskovic@gmail.com                                            *
  11  *                                                                         *
  12  *   This program is free software; you can redistribute it and/or modify  *
  13  *   it under the terms of the GNU General Public License as published by  *
  14  *   the Free Software Foundation; either version 2 of the License, or     *
  15  *   (at your option) any later version.                                   *
  16  *                                                                         *
  17  *   This program is distributed in the hope that it will be useful,       *
  18  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  19  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  20  *   GNU General Public License for more details.                          *
  21  *                                                                         *
  22  *   You should have received a copy of the GNU General Public License     *
  23  *   along with this program; if not, write to the                         *
  24  *   Free Software Foundation, Inc.,                                       *
  25  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  26  ***************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include "breakpoints.h"
  32 #include "mips32.h"
  33 #include "mips_m4k.h"
  34 #include "mips32_dmaacc.h"
  35 #include "target_type.h"
  36 #include "register.h"
  37
  38 static void mips_m4k_enable_breakpoints(struct target *target);
  39 static void mips_m4k_enable_watchpoints(struct target *target);
  40 static int mips_m4k_set_breakpoint(struct target *target,
  41                 struct breakpoint *breakpoint);
  42 static int mips_m4k_unset_breakpoint(struct target *target,
  43                 struct breakpoint *breakpoint);
  44
  45 static int mips_m4k_examine_debug_reason(struct target *target)
  46 {
  47         uint32_t break_status;
  48         int retval;
  49
  50         if ((target->debug_reason != DBG_REASON_DBGRQ)
  51                 && (target->debug_reason != DBG_REASON_SINGLESTEP))
  52         {
  53                 /* get info about inst breakpoint support */
  54                 if ((retval = target_read_u32(target, EJTAG_IBS, &break_status)) != ERROR_OK)
  55                         return retval;
  56                 if (break_status & 0x1f)
  57                 {
  58                         /* we have halted on a  breakpoint */
  59                         if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
  60                                 return retval;
  61                         target->debug_reason = DBG_REASON_BREAKPOINT;
  62                 }
  63
  64                 /* get info about data breakpoint support */
  65                 if ((retval = target_read_u32(target, EJTAG_DBS, &break_status)) != ERROR_OK)
  66                         return retval;
  67                 if (break_status & 0x1f)
  68                 {
  69                         /* we have halted on a  breakpoint */
  70                         if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
  71                                 return retval;
  72                         target->debug_reason = DBG_REASON_WATCHPOINT;
  73                 }
  74         }
  75
  76         return ERROR_OK;
  77 }
  78
  79 static int mips_m4k_debug_entry(struct target *target)
  80 {
  81         struct mips32_common *mips32 = target_to_mips32(target);
  82         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
  83         uint32_t debug_reg;
  84
  85         /* read debug register */
  86         mips_ejtag_read_debug(ejtag_info, &debug_reg);
  87
  88         /* make sure break unit configured */
  89         mips32_configure_break_unit(target);
  90
  91         /* attempt to find halt reason */
  92         mips_m4k_examine_debug_reason(target);
  93
  94         /* clear single step if active */
  95         if (debug_reg & EJTAG_DEBUG_DSS)
  96         {
  97                 /* stopped due to single step - clear step bit */
  98                 mips_ejtag_config_step(ejtag_info, 0);
  99         }
 100
 101         mips32_save_context(target);
 102
 103         /* default to mips32 isa, it will be changed below if required */
 104         mips32->isa_mode = MIPS32_ISA_MIPS32;
 105
 106         if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
 107                 mips32->isa_mode = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1);
 108         }
 109
 110         LOG_DEBUG("entered debug state at PC 0x%" PRIx32 ", target->state: %s",
 111                         buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32),
 112                         target_state_name(target));
 113
 114         return ERROR_OK;
 115 }
 116
 117 static int mips_m4k_poll(struct target *target)
 118 {
 119         int retval;
 120         struct mips32_common *mips32 = target_to_mips32(target);
 121         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 122         uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl;
 123
 124         /* read ejtag control reg */
 125         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
 126         retval = mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
 127         if (retval != ERROR_OK)
 128                 return retval;
 129
 130         /* clear this bit before handling polling
 131          * as after reset registers will read zero */
 132         if (ejtag_ctrl & EJTAG_CTRL_ROCC)
 133         {
 134                 /* we have detected a reset, clear flag
 135                  * otherwise ejtag will not work */
 136                 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_ROCC;
 137
 138                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
 139                 retval = mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
 140                 if (retval != ERROR_OK)
 141                         return retval;
 142                 LOG_DEBUG("Reset Detected");
 143         }
 144
 145         /* check for processor halted */
 146         if (ejtag_ctrl & EJTAG_CTRL_BRKST)
 147         {
 148                 if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
 149                 {
 150                         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
 151
 152                         target->state = TARGET_HALTED;
 153
 154                         if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
 155                                 return retval;
 156
 157                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 158                 }
 159                 else if (target->state == TARGET_DEBUG_RUNNING)
 160                 {
 161                         target->state = TARGET_HALTED;
 162
 163                         if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
 164                                 return retval;
 165
 166                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 167                 }
 168         }
 169         else
 170         {
 171                 target->state = TARGET_RUNNING;
 172         }
 173
 174 //      LOG_DEBUG("ctrl = 0x%08X", ejtag_ctrl);
 175
 176         return ERROR_OK;
 177 }
 178
 179 static int mips_m4k_halt(struct target *target)
 180 {
 181         struct mips32_common *mips32 = target_to_mips32(target);
 182         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 183
 184         LOG_DEBUG("target->state: %s",
 185                   target_state_name(target));
 186
 187         if (target->state == TARGET_HALTED)
 188         {
 189                 LOG_DEBUG("target was already halted");
 190                 return ERROR_OK;
 191         }
 192
 193         if (target->state == TARGET_UNKNOWN)
 194         {
 195                 LOG_WARNING("target was in unknown state when halt was requested");
 196         }
 197
 198         if (target->state == TARGET_RESET)
 199         {
 200                 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst())
 201                 {
 202                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 203                         return ERROR_TARGET_FAILURE;
 204                 }
 205                 else
 206                 {
 207                         /* we came here in a reset_halt or reset_init sequence
 208                          * debug entry was already prepared in mips32_prepare_reset_halt()
 209                          */
 210                         target->debug_reason = DBG_REASON_DBGRQ;
 211
 212                         return ERROR_OK;
 213                 }
 214         }
 215
 216         /* break processor */
 217         mips_ejtag_enter_debug(ejtag_info);
 218
 219         target->debug_reason = DBG_REASON_DBGRQ;
 220
 221         return ERROR_OK;
 222 }
 223
 224 static int mips_m4k_assert_reset(struct target *target)
 225 {
 226         struct mips_m4k_common *mips_m4k = target_to_m4k(target);
 227         struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
 228         int assert_srst = 1;
 229
 230         LOG_DEBUG("target->state: %s",
 231                 target_state_name(target));
 232
 233         enum reset_types jtag_reset_config = jtag_get_reset_config();
 234
 235         if (!(jtag_reset_config & RESET_HAS_SRST))
 236                 assert_srst = 0;
 237
 238         if (target->reset_halt)
 239         {
 240                 /* use hardware to catch reset */
 241                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT);
 242         }
 243         else
 244         {
 245                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
 246         }
 247
 248         if (assert_srst)
 249         {
 250                 /* here we should issue a srst only, but we may have to assert trst as well */
 251                 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 252                 {
 253                         jtag_add_reset(1, 1);
 254                 }
 255                 else
 256                 {
 257                         jtag_add_reset(0, 1);
 258                 }
 259         }
 260         else
 261         {
 262                 if (mips_m4k->is_pic32mx)
 263                 {
 264                         LOG_DEBUG("Using MTAP reset to reset processor...");
 265
 266                         /* use microchip specific MTAP reset */
 267                         mips_ejtag_set_instr(ejtag_info, MTAP_SW_MTAP);
 268                         mips_ejtag_set_instr(ejtag_info, MTAP_COMMAND);
 269
 270                         mips_ejtag_drscan_8_out(ejtag_info, MCHP_ASERT_RST);
 271                         mips_ejtag_drscan_8_out(ejtag_info, MCHP_DE_ASSERT_RST);
 272                         mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
 273                 }
 274                 else
 275                 {
 276                         /* use ejtag reset - not supported by all cores */
 277                         uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_PRRST | EJTAG_CTRL_PERRST;
 278                         LOG_DEBUG("Using EJTAG reset (PRRST) to reset processor...");
 279                         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
 280                         mips_ejtag_drscan_32_out(ejtag_info, ejtag_ctrl);
 281                 }
 282         }
 283
 284         target->state = TARGET_RESET;
 285         jtag_add_sleep(50000);
 286
 287         register_cache_invalidate(mips_m4k->mips32.core_cache);
 288
 289         if (target->reset_halt)
 290         {
 291                 int retval;
 292                 if ((retval = target_halt(target)) != ERROR_OK)
 293                         return retval;
 294         }
 295
 296         return ERROR_OK;
 297 }
 298
 299 static int mips_m4k_deassert_reset(struct target *target)
 300 {
 301         LOG_DEBUG("target->state: %s",
 302                 target_state_name(target));
 303
 304         /* deassert reset lines */
 305         jtag_add_reset(0, 0);
 306
 307         return ERROR_OK;
 308 }
 309
 310 static int mips_m4k_soft_reset_halt(struct target *target)
 311 {
 312         /* TODO */
 313         return ERROR_OK;
 314 }
 315
 316 static int mips_m4k_single_step_core(struct target *target)
 317 {
 318         struct mips32_common *mips32 = target_to_mips32(target);
 319         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 320
 321         /* configure single step mode */
 322         mips_ejtag_config_step(ejtag_info, 1);
 323
 324         /* disable interrupts while stepping */
 325         mips32_enable_interrupts(target, 0);
 326
 327         /* exit debug mode */
 328         mips_ejtag_exit_debug(ejtag_info);
 329
 330         mips_m4k_debug_entry(target);
 331
 332         return ERROR_OK;
 333 }
 334
 335 static int mips_m4k_resume(struct target *target, int current,
 336                 uint32_t address, int handle_breakpoints, int debug_execution)
 337 {
 338         struct mips32_common *mips32 = target_to_mips32(target);
 339         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 340         struct breakpoint *breakpoint = NULL;
 341         uint32_t resume_pc;
 342
 343         if (target->state != TARGET_HALTED)
 344         {
 345                 LOG_WARNING("target not halted");
 346                 return ERROR_TARGET_NOT_HALTED;
 347         }
 348
 349         if (!debug_execution)
 350         {
 351                 target_free_all_working_areas(target);
 352                 mips_m4k_enable_breakpoints(target);
 353                 mips_m4k_enable_watchpoints(target);
 354         }
 355
 356         /* current = 1: continue on current pc, otherwise continue at <address> */
 357         if (!current)
 358         {
 359                 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
 360                 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
 361                 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
 362         }
 363
 364         if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
 365                 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1, mips32->isa_mode);
 366         }
 367
 368         resume_pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
 369
 370         mips32_restore_context(target);
 371
 372         /* the front-end may request us not to handle breakpoints */
 373         if (handle_breakpoints)
 374         {
 375                 /* Single step past breakpoint at current address */
 376                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 377                 {
 378                         LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 "", breakpoint->address);
 379                         mips_m4k_unset_breakpoint(target, breakpoint);
 380                         mips_m4k_single_step_core(target);
 381                         mips_m4k_set_breakpoint(target, breakpoint);
 382                 }
 383         }
 384
 385         /* enable interrupts if we are running */
 386         mips32_enable_interrupts(target, !debug_execution);
 387
 388         /* exit debug mode */
 389         mips_ejtag_exit_debug(ejtag_info);
 390         target->debug_reason = DBG_REASON_NOTHALTED;
 391
 392         /* registers are now invalid */
 393         register_cache_invalidate(mips32->core_cache);
 394
 395         if (!debug_execution)
 396         {
 397                 target->state = TARGET_RUNNING;
 398                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 399                 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
 400         }
 401         else
 402         {
 403                 target->state = TARGET_DEBUG_RUNNING;
 404                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 405                 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
 406         }
 407
 408         return ERROR_OK;
 409 }
 410
 411 static int mips_m4k_step(struct target *target, int current,
 412                 uint32_t address, int handle_breakpoints)
 413 {
 414         /* get pointers to arch-specific information */
 415         struct mips32_common *mips32 = target_to_mips32(target);
 416         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 417         struct breakpoint *breakpoint = NULL;
 418
 419         if (target->state != TARGET_HALTED)
 420         {
 421                 LOG_WARNING("target not halted");
 422                 return ERROR_TARGET_NOT_HALTED;
 423         }
 424
 425         /* current = 1: continue on current pc, otherwise continue at <address> */
 426         if (!current)
 427         {
 428                 buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
 429                 mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
 430                 mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
 431         }
 432
 433         /* the front-end may request us not to handle breakpoints */
 434         if (handle_breakpoints) {
 435                 breakpoint = breakpoint_find(target,
 436                                 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
 437                 if (breakpoint)
 438                         mips_m4k_unset_breakpoint(target, breakpoint);
 439         }
 440
 441         /* restore context */
 442         mips32_restore_context(target);
 443
 444         /* configure single step mode */
 445         mips_ejtag_config_step(ejtag_info, 1);
 446
 447         target->debug_reason = DBG_REASON_SINGLESTEP;
 448
 449         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 450
 451         /* disable interrupts while stepping */
 452         mips32_enable_interrupts(target, 0);
 453
 454         /* exit debug mode */
 455         mips_ejtag_exit_debug(ejtag_info);
 456
 457         /* registers are now invalid */
 458         register_cache_invalidate(mips32->core_cache);
 459
 460         if (breakpoint)
 461                 mips_m4k_set_breakpoint(target, breakpoint);
 462
 463         LOG_DEBUG("target stepped ");
 464
 465         mips_m4k_debug_entry(target);
 466         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 467
 468         return ERROR_OK;
 469 }
 470
 471 static void mips_m4k_enable_breakpoints(struct target *target)
 472 {
 473         struct breakpoint *breakpoint = target->breakpoints;
 474
 475         /* set any pending breakpoints */
 476         while (breakpoint)
 477         {
 478                 if (breakpoint->set == 0)
 479                         mips_m4k_set_breakpoint(target, breakpoint);
 480                 breakpoint = breakpoint->next;
 481         }
 482 }
 483
 484 static int mips_m4k_set_breakpoint(struct target *target,
 485                 struct breakpoint *breakpoint)
 486 {
 487         struct mips32_common *mips32 = target_to_mips32(target);
 488         struct mips32_comparator * comparator_list = mips32->inst_break_list;
 489         int retval;
 490
 491         if (breakpoint->set)
 492         {
 493                 LOG_WARNING("breakpoint already set");
 494                 return ERROR_OK;
 495         }
 496
 497         if (breakpoint->type == BKPT_HARD)
 498         {
 499                 int bp_num = 0;
 500
 501                 while (comparator_list[bp_num].used && (bp_num < mips32->num_inst_bpoints))
 502                         bp_num++;
 503                 if (bp_num >= mips32->num_inst_bpoints)
 504                 {
 505                         LOG_ERROR("Can not find free FP Comparator(bpid: %d)",
 506                                           breakpoint->unique_id );
 507                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 508                 }
 509                 breakpoint->set = bp_num + 1;
 510                 comparator_list[bp_num].used = 1;
 511                 comparator_list[bp_num].bp_value = breakpoint->address;
 512                 target_write_u32(target, comparator_list[bp_num].reg_address, comparator_list[bp_num].bp_value);
 513                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x08, 0x00000000);
 514                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 1);
 515                 LOG_DEBUG("bpid: %d, bp_num %i bp_value 0x%" PRIx32 "",
 516                                   breakpoint->unique_id,
 517                                   bp_num, comparator_list[bp_num].bp_value);
 518         }
 519         else if (breakpoint->type == BKPT_SOFT)
 520         {
 521                 LOG_DEBUG("bpid: %d", breakpoint->unique_id );
 522                 if (breakpoint->length == 4)
 523                 {
 524                         uint32_t verify = 0xffffffff;
 525
 526                         if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
 527                                         breakpoint->orig_instr)) != ERROR_OK)
 528                         {
 529                                 return retval;
 530                         }
 531                         if ((retval = target_write_u32(target, breakpoint->address, MIPS32_SDBBP)) != ERROR_OK)
 532                         {
 533                                 return retval;
 534                         }
 535
 536                         if ((retval = target_read_u32(target, breakpoint->address, &verify)) != ERROR_OK)
 537                         {
 538                                 return retval;
 539                         }
 540                         if (verify != MIPS32_SDBBP)
 541                         {
 542                                 LOG_ERROR("Unable to set 32bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
 543                                 return ERROR_OK;
 544                         }
 545                 }
 546                 else
 547                 {
 548                         uint16_t verify = 0xffff;
 549
 550                         if ((retval = target_read_memory(target, breakpoint->address, breakpoint->length, 1,
 551                                         breakpoint->orig_instr)) != ERROR_OK)
 552                         {
 553                                 return retval;
 554                         }
 555                         if ((retval = target_write_u16(target, breakpoint->address, MIPS16_SDBBP)) != ERROR_OK)
 556                         {
 557                                 return retval;
 558                         }
 559
 560                         if ((retval = target_read_u16(target, breakpoint->address, &verify)) != ERROR_OK)
 561                         {
 562                                 return retval;
 563                         }
 564                         if (verify != MIPS16_SDBBP)
 565                         {
 566                                 LOG_ERROR("Unable to set 16bit breakpoint at address %08" PRIx32 " - check that memory is read/writable", breakpoint->address);
 567                                 return ERROR_OK;
 568                         }
 569                 }
 570
 571                 breakpoint->set = 20; /* Any nice value but 0 */
 572         }
 573
 574         return ERROR_OK;
 575 }
 576
 577 static int mips_m4k_unset_breakpoint(struct target *target,
 578                 struct breakpoint *breakpoint)
 579 {
 580         /* get pointers to arch-specific information */
 581         struct mips32_common *mips32 = target_to_mips32(target);
 582         struct mips32_comparator *comparator_list = mips32->inst_break_list;
 583         int retval;
 584
 585         if (!breakpoint->set)
 586         {
 587                 LOG_WARNING("breakpoint not set");
 588                 return ERROR_OK;
 589         }
 590
 591         if (breakpoint->type == BKPT_HARD)
 592         {
 593                 int bp_num = breakpoint->set - 1;
 594                 if ((bp_num < 0) || (bp_num >= mips32->num_inst_bpoints))
 595                 {
 596                         LOG_DEBUG("Invalid FP Comparator number in breakpoint (bpid: %d)",
 597                                           breakpoint->unique_id);
 598                         return ERROR_OK;
 599                 }
 600                 LOG_DEBUG("bpid: %d - releasing hw: %d",
 601                                   breakpoint->unique_id,
 602                                   bp_num );
 603                 comparator_list[bp_num].used = 0;
 604                 comparator_list[bp_num].bp_value = 0;
 605                 target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 0);
 606
 607         }
 608         else
 609         {
 610                 /* restore original instruction (kept in target endianness) */
 611                 LOG_DEBUG("bpid: %d", breakpoint->unique_id);
 612                 if (breakpoint->length == 4)
 613                 {
 614                         uint32_t current_instr;
 615
 616                         /* check that user program has not modified breakpoint instruction */
 617                         if ((retval = target_read_memory(target, breakpoint->address, 4, 1,
 618                                         (uint8_t*)&current_instr)) != ERROR_OK)
 619                         {
 620                                 return retval;
 621                         }
 622
 623                         /**
 624                          * target_read_memory() gets us data in _target_ endianess.
 625                          * If we want to use this data on the host for comparisons with some macros
 626                          * we must first transform it to _host_ endianess using target_buffer_get_u32().
 627                          */
 628                         current_instr = target_buffer_get_u32(target, (uint8_t *)&current_instr);
 629
 630                         if (current_instr == MIPS32_SDBBP)
 631                         {
 632                                 if ((retval = target_write_memory(target, breakpoint->address, 4, 1,
 633                                                 breakpoint->orig_instr)) != ERROR_OK)
 634                                 {
 635                                         return retval;
 636                                 }
 637                         }
 638                 }
 639                 else
 640                 {
 641                         uint16_t current_instr;
 642
 643                         /* check that user program has not modified breakpoint instruction */
 644                         if ((retval = target_read_memory(target, breakpoint->address, 2, 1,
 645                                         (uint8_t*)&current_instr)) != ERROR_OK)
 646                         {
 647                                 return retval;
 648                         }
 649                         current_instr = target_buffer_get_u16(target, (uint8_t *)&current_instr);
 650                         if (current_instr == MIPS16_SDBBP)
 651                         {
 652                                 if ((retval = target_write_memory(target, breakpoint->address, 2, 1,
 653                                                 breakpoint->orig_instr)) != ERROR_OK)
 654                                 {
 655                                         return retval;
 656                                 }
 657                         }
 658                 }
 659         }
 660         breakpoint->set = 0;
 661
 662         return ERROR_OK;
 663 }
 664
 665 static int mips_m4k_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
 666 {
 667         struct mips32_common *mips32 = target_to_mips32(target);
 668
 669         if (breakpoint->type == BKPT_HARD)
 670         {
 671                 if (mips32->num_inst_bpoints_avail < 1)
 672                 {
 673                         LOG_INFO("no hardware breakpoint available");
 674                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 675                 }
 676
 677                 mips32->num_inst_bpoints_avail--;
 678         }
 679
 680         return mips_m4k_set_breakpoint(target, breakpoint);
 681 }
 682
 683 static int mips_m4k_remove_breakpoint(struct target *target,
 684                 struct breakpoint *breakpoint)
 685 {
 686         /* get pointers to arch-specific information */
 687         struct mips32_common *mips32 = target_to_mips32(target);
 688
 689         if (target->state != TARGET_HALTED)
 690         {
 691                 LOG_WARNING("target not halted");
 692                 return ERROR_TARGET_NOT_HALTED;
 693         }
 694
 695         if (breakpoint->set)
 696         {
 697                 mips_m4k_unset_breakpoint(target, breakpoint);
 698         }
 699
 700         if (breakpoint->type == BKPT_HARD)
 701                 mips32->num_inst_bpoints_avail++;
 702
 703         return ERROR_OK;
 704 }
 705
 706 static int mips_m4k_set_watchpoint(struct target *target,
 707                 struct watchpoint *watchpoint)
 708 {
 709         struct mips32_common *mips32 = target_to_mips32(target);
 710         struct mips32_comparator *comparator_list = mips32->data_break_list;
 711         int wp_num = 0;
 712         /*
 713          * watchpoint enabled, ignore all byte lanes in value register
 714          * and exclude both load and store accesses from  watchpoint
 715          * condition evaluation
 716         */
 717         int enable = EJTAG_DBCn_NOSB | EJTAG_DBCn_NOLB | EJTAG_DBCn_BE |
 718                 (0xff << EJTAG_DBCn_BLM_SHIFT);
 719
 720         if (watchpoint->set)
 721         {
 722                 LOG_WARNING("watchpoint already set");
 723                 return ERROR_OK;
 724         }
 725
 726         while(comparator_list[wp_num].used && (wp_num < mips32->num_data_bpoints))
 727                 wp_num++;
 728         if (wp_num >= mips32->num_data_bpoints)
 729         {
 730                 LOG_ERROR("Can not find free FP Comparator");
 731                 return ERROR_FAIL;
 732         }
 733
 734         if (watchpoint->length != 4)
 735         {
 736                 LOG_ERROR("Only watchpoints of length 4 are supported");
 737                 return ERROR_TARGET_UNALIGNED_ACCESS;
 738         }
 739
 740         if (watchpoint->address % 4)
 741         {
 742                 LOG_ERROR("Watchpoints address should be word aligned");
 743                 return ERROR_TARGET_UNALIGNED_ACCESS;
 744         }
 745
 746         switch (watchpoint->rw)
 747         {
 748                 case WPT_READ:
 749                         enable &= ~EJTAG_DBCn_NOLB;
 750                         break;
 751                 case WPT_WRITE:
 752                         enable &= ~EJTAG_DBCn_NOSB;
 753                         break;
 754                 case WPT_ACCESS:
 755                         enable &= ~(EJTAG_DBCn_NOLB | EJTAG_DBCn_NOSB);
 756                         break;
 757                 default:
 758                         LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
 759         }
 760
 761         watchpoint->set = wp_num + 1;
 762         comparator_list[wp_num].used = 1;
 763         comparator_list[wp_num].bp_value = watchpoint->address;
 764         target_write_u32(target, comparator_list[wp_num].reg_address, comparator_list[wp_num].bp_value);
 765         target_write_u32(target, comparator_list[wp_num].reg_address + 0x08, 0x00000000);
 766         target_write_u32(target, comparator_list[wp_num].reg_address + 0x10, 0x00000000);
 767         target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, enable);
 768         target_write_u32(target, comparator_list[wp_num].reg_address + 0x20, 0);
 769         LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "", wp_num, comparator_list[wp_num].bp_value);
 770
 771         return ERROR_OK;
 772 }
 773
 774 static int mips_m4k_unset_watchpoint(struct target *target,
 775                 struct watchpoint *watchpoint)
 776 {
 777         /* get pointers to arch-specific information */
 778         struct mips32_common *mips32 = target_to_mips32(target);
 779         struct mips32_comparator *comparator_list = mips32->data_break_list;
 780
 781         if (!watchpoint->set)
 782         {
 783                 LOG_WARNING("watchpoint not set");
 784                 return ERROR_OK;
 785         }
 786
 787         int wp_num = watchpoint->set - 1;
 788         if ((wp_num < 0) || (wp_num >= mips32->num_data_bpoints))
 789         {
 790                 LOG_DEBUG("Invalid FP Comparator number in watchpoint");
 791                 return ERROR_OK;
 792         }
 793         comparator_list[wp_num].used = 0;
 794         comparator_list[wp_num].bp_value = 0;
 795         target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, 0);
 796         watchpoint->set = 0;
 797
 798         return ERROR_OK;
 799 }
 800
 801 static int mips_m4k_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
 802 {
 803         struct mips32_common *mips32 = target_to_mips32(target);
 804
 805         if (mips32->num_data_bpoints_avail < 1)
 806         {
 807                 LOG_INFO("no hardware watchpoints available");
 808                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 809         }
 810
 811         mips32->num_data_bpoints_avail--;
 812
 813         mips_m4k_set_watchpoint(target, watchpoint);
 814         return ERROR_OK;
 815 }
 816
 817 static int mips_m4k_remove_watchpoint(struct target *target,
 818                 struct watchpoint *watchpoint)
 819 {
 820         /* get pointers to arch-specific information */
 821         struct mips32_common *mips32 = target_to_mips32(target);
 822
 823         if (target->state != TARGET_HALTED)
 824         {
 825                 LOG_WARNING("target not halted");
 826                 return ERROR_TARGET_NOT_HALTED;
 827         }
 828
 829         if (watchpoint->set)
 830         {
 831                 mips_m4k_unset_watchpoint(target, watchpoint);
 832         }
 833
 834         mips32->num_data_bpoints_avail++;
 835
 836         return ERROR_OK;
 837 }
 838
 839 static void mips_m4k_enable_watchpoints(struct target *target)
 840 {
 841         struct watchpoint *watchpoint = target->watchpoints;
 842
 843         /* set any pending watchpoints */
 844         while (watchpoint)
 845         {
 846                 if (watchpoint->set == 0)
 847                         mips_m4k_set_watchpoint(target, watchpoint);
 848                 watchpoint = watchpoint->next;
 849         }
 850 }
 851
 852 static int mips_m4k_read_memory(struct target *target, uint32_t address,
 853                 uint32_t size, uint32_t count, uint8_t *buffer)
 854 {
 855         struct mips32_common *mips32 = target_to_mips32(target);
 856         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 857
 858         LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, size, count);
 859
 860         if (target->state != TARGET_HALTED)
 861         {
 862                 LOG_WARNING("target not halted");
 863                 return ERROR_TARGET_NOT_HALTED;
 864         }
 865
 866         /* sanitize arguments */
 867         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
 868                 return ERROR_COMMAND_SYNTAX_ERROR;
 869
 870         if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
 871                 return ERROR_TARGET_UNALIGNED_ACCESS;
 872
 873         /* since we don't know if buffer is aligned, we allocate new mem that is always aligned */
 874         void *t = NULL;
 875
 876         if (size > 1)
 877         {
 878                 t = malloc(count * size * sizeof(uint8_t));
 879                 if (t == NULL)
 880                 {
 881                         LOG_ERROR("Out of memory");
 882                         return ERROR_FAIL;
 883                 }
 884         }
 885         else
 886         {
 887                 t = buffer;
 888         }
 889
 890         /* if noDMA off, use DMAACC mode for memory read */
 891         int retval;
 892         if (ejtag_info->impcode & EJTAG_IMP_NODMA)
 893                 retval = mips32_pracc_read_mem(ejtag_info, address, size, count, t);
 894         else
 895                 retval = mips32_dmaacc_read_mem(ejtag_info, address, size, count, t);
 896
 897         /* mips32_..._read_mem with size 4/2 returns uint32_t/uint16_t in host */
 898         /* endianness, but byte array should represent target endianness       */
 899         if (ERROR_OK == retval)
 900         {
 901                 switch(size)
 902                 {
 903                 case 4:
 904                         target_buffer_set_u32_array(target,buffer,count,t);
 905                         break;
 906                 case 2:
 907                         target_buffer_set_u16_array(target,buffer,count,t);
 908                         break;
 909                 }
 910         }
 911
 912         if ((size > 1) && (t != NULL))
 913                 free(t);
 914
 915         return retval;
 916 }
 917
 918 static int mips_m4k_write_memory(struct target *target, uint32_t address,
 919                 uint32_t size, uint32_t count, const uint8_t *buffer)
 920 {
 921         struct mips32_common *mips32 = target_to_mips32(target);
 922         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 923
 924         LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "",
 925                         address, size, count);
 926
 927         if (target->state != TARGET_HALTED)
 928         {
 929                 LOG_WARNING("target not halted");
 930                 return ERROR_TARGET_NOT_HALTED;
 931         }
 932
 933         /* sanitize arguments */
 934         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
 935                 return ERROR_COMMAND_SYNTAX_ERROR;
 936
 937         if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
 938                 return ERROR_TARGET_UNALIGNED_ACCESS;
 939
 940         /** correct endianess if we have word or hword access */
 941         void *t = NULL;
 942         if (size > 1)
 943         {
 944                 /* mips32_..._write_mem with size 4/2 requires uint32_t/uint16_t in host */
 945                 /* endianness, but byte array represents target endianness               */
 946                 t = malloc(count * size * sizeof(uint8_t));
 947                 if (t == NULL)
 948                 {
 949                         LOG_ERROR("Out of memory");
 950                         return ERROR_FAIL;
 951                 }
 952
 953                 switch(size)
 954                 {
 955                 case 4:
 956                         target_buffer_get_u32_array(target,buffer,count,(uint32_t*)t);
 957                         break;
 958                 case 2:
 959                         target_buffer_get_u16_array(target,buffer,count,(uint16_t*)t);
 960                         break;
 961                 }
 962                 buffer = t;
 963         }
 964
 965         /* if noDMA off, use DMAACC mode for memory write */
 966         int retval;
 967         if (ejtag_info->impcode & EJTAG_IMP_NODMA)
 968                 retval = mips32_pracc_write_mem(ejtag_info, address, size, count, (void *)buffer);
 969         else
 970                 retval = mips32_dmaacc_write_mem(ejtag_info, address, size, count, (void *)buffer);
 971
 972         if (t != NULL)
 973                 free(t);
 974
 975         if (ERROR_OK != retval)
 976                 return retval;
 977
 978         return ERROR_OK;
 979 }
 980
 981 static int mips_m4k_init_target(struct command_context *cmd_ctx,
 982                 struct target *target)
 983 {
 984         mips32_build_reg_cache(target);
 985
 986         return ERROR_OK;
 987 }
 988
 989 static int mips_m4k_init_arch_info(struct target *target,
 990                 struct mips_m4k_common *mips_m4k, struct jtag_tap *tap)
 991 {
 992         struct mips32_common *mips32 = &mips_m4k->mips32;
 993
 994         mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
 995
 996         /* initialize mips4k specific info */
 997         mips32_init_arch_info(target, mips32, tap);
 998         mips32->arch_info = mips_m4k;
 999
1000         return ERROR_OK;
1001 }
1002
1003 static int mips_m4k_target_create(struct target *target, Jim_Interp *interp)
1004 {
1005         struct mips_m4k_common *mips_m4k = calloc(1, sizeof(struct mips_m4k_common));
1006
1007         mips_m4k_init_arch_info(target, mips_m4k, target->tap);
1008
1009         return ERROR_OK;
1010 }
1011
1012 static int mips_m4k_examine(struct target *target)
1013 {
1014         int retval;
1015         struct mips_m4k_common *mips_m4k = target_to_m4k(target);
1016         struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
1017         uint32_t idcode = 0;
1018
1019         if (!target_was_examined(target))
1020         {
1021                 retval = mips_ejtag_get_idcode(ejtag_info, &idcode);
1022                 if (retval != ERROR_OK)
1023                         return retval;
1024                 ejtag_info->idcode = idcode;
1025
1026                 if (((idcode >> 1) & 0x7FF) == 0x29)
1027                 {
1028                         /* we are using a pic32mx so select ejtag port
1029                          * as it is not selected by default */
1030                         mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
1031                         LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
1032                         mips_m4k->is_pic32mx = true;
1033                 }
1034         }
1035
1036         /* init rest of ejtag interface */
1037         if ((retval = mips_ejtag_init(ejtag_info)) != ERROR_OK)
1038                 return retval;
1039
1040         if ((retval = mips32_examine(target)) != ERROR_OK)
1041                 return retval;
1042
1043         return ERROR_OK;
1044 }
1045
1046 static int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
1047                 uint32_t count, const uint8_t *buffer)
1048 {
1049         struct mips32_common *mips32 = target_to_mips32(target);
1050         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
1051         int retval;
1052         int write_t = 1;
1053
1054         LOG_DEBUG("address: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, count);
1055
1056         if (target->state != TARGET_HALTED)
1057         {
1058                 LOG_WARNING("target not halted");
1059                 return ERROR_TARGET_NOT_HALTED;
1060         }
1061
1062         /* check alignment */
1063         if (address & 0x3u)
1064                 return ERROR_TARGET_UNALIGNED_ACCESS;
1065
1066         if (mips32->fast_data_area == NULL)
1067         {
1068                 /* Get memory for block write handler
1069                  * we preserve this area between calls and gain a speed increase
1070                  * of about 3kb/sec when writing flash
1071                  * this will be released/nulled by the system when the target is resumed or reset */
1072                 retval = target_alloc_working_area(target,
1073                                 MIPS32_FASTDATA_HANDLER_SIZE,
1074                                 &mips32->fast_data_area);
1075                 if (retval != ERROR_OK)
1076                 {
1077                         LOG_WARNING("No working area available, falling back to non-bulk write");
1078                         return mips_m4k_write_memory(target, address, 4, count, buffer);
1079                 }
1080
1081                 /* reset fastadata state so the algo get reloaded */
1082                 ejtag_info->fast_access_save = -1;
1083         }
1084
1085         /* mips32_pracc_fastdata_xfer requires uint32_t in host endianness, */
1086         /* but byte array represents target endianness                      */
1087         uint32_t *t = NULL;
1088         t = malloc(count * sizeof(uint32_t));
1089         if (t == NULL)
1090         {
1091                 LOG_ERROR("Out of memory");
1092                 return ERROR_FAIL;
1093         }
1094
1095         target_buffer_get_u32_array(target,buffer,count,t);
1096
1097         retval = mips32_pracc_fastdata_xfer(ejtag_info, mips32->fast_data_area, write_t, address,
1098                         count, t);
1099
1100         if (t != NULL)
1101                 free(t);
1102
1103         if (retval != ERROR_OK)
1104         {
1105                 /* FASTDATA access failed, try normal memory write */
1106                 LOG_DEBUG("Fastdata access Failed, falling back to non-bulk write");
1107                 retval = mips_m4k_write_memory(target, address, 4, count, buffer);
1108         }
1109
1110         return retval;
1111 }
1112
1113 static int mips_m4k_verify_pointer(struct command_context *cmd_ctx,
1114                 struct mips_m4k_common *mips_m4k)
1115 {
1116         if (mips_m4k->common_magic != MIPSM4K_COMMON_MAGIC) {
1117                 command_print(cmd_ctx, "target is not an MIPS_M4K");
1118                 return ERROR_TARGET_INVALID;
1119         }
1120         return ERROR_OK;
1121 }
1122
1123 COMMAND_HANDLER(mips_m4k_handle_cp0_command)
1124 {
1125         int retval;
1126         struct target *target = get_current_target(CMD_CTX);
1127         struct mips_m4k_common *mips_m4k = target_to_m4k(target);
1128         struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
1129
1130         retval = mips_m4k_verify_pointer(CMD_CTX, mips_m4k);
1131         if (retval != ERROR_OK)
1132                 return retval;
1133
1134         if (target->state != TARGET_HALTED)
1135         {
1136                 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
1137                 return ERROR_OK;
1138         }
1139
1140         /* two or more argument, access a single register/select (write if third argument is given) */
1141         if (CMD_ARGC < 2)
1142         {
1143                 command_print(CMD_CTX, "command requires more arguments.");
1144         }
1145         else
1146         {
1147                 uint32_t cp0_reg, cp0_sel;
1148                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], cp0_reg);
1149                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], cp0_sel);
1150
1151                 if (CMD_ARGC == 2)
1152                 {
1153                         uint32_t value;
1154
1155                         if ((retval = mips32_cp0_read(ejtag_info, &value, cp0_reg, cp0_sel)) != ERROR_OK)
1156                         {
1157                                 command_print(CMD_CTX,
1158                                                 "couldn't access reg %" PRIi32,
1159                                                 cp0_reg);
1160                                 return ERROR_OK;
1161                         }
1162                         if ((retval = jtag_execute_queue()) != ERROR_OK)
1163                         {
1164                                 return retval;
1165                         }
1166
1167                         command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
1168                                         cp0_reg, cp0_sel, value);
1169                 }
1170                 else if (CMD_ARGC == 3)
1171                 {
1172                         uint32_t value;
1173                         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], value);
1174                         if ((retval = mips32_cp0_write(ejtag_info, value, cp0_reg, cp0_sel)) != ERROR_OK)
1175                         {
1176                                 command_print(CMD_CTX,
1177                                                 "couldn't access cp0 reg %" PRIi32 ", select %" PRIi32,
1178                                                 cp0_reg,  cp0_sel);
1179                                 return ERROR_OK;
1180                         }
1181                         command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
1182                                         cp0_reg, cp0_sel, value);
1183                 }
1184         }
1185
1186         return ERROR_OK;
1187 }
1188
1189 static const struct command_registration mips_m4k_exec_command_handlers[] = {
1190         {
1191                 .name = "cp0",
1192                 .handler = mips_m4k_handle_cp0_command,
1193                 .mode = COMMAND_EXEC,
1194                 .usage = "regnum [value]",
1195                 .help = "display/modify cp0 register",
1196         },
1197         COMMAND_REGISTRATION_DONE
1198 };
1199
1200 const struct command_registration mips_m4k_command_handlers[] = {
1201         {
1202                 .chain = mips32_command_handlers,
1203         },
1204         {
1205                 .name = "mips_m4k",
1206                 .mode = COMMAND_ANY,
1207                 .help = "mips_m4k command group",
1208                 .chain = mips_m4k_exec_command_handlers,
1209         },
1210         COMMAND_REGISTRATION_DONE
1211 };
1212
1213 struct target_type mips_m4k_target =
1214 {
1215         .name = "mips_m4k",
1216
1217         .poll = mips_m4k_poll,
1218         .arch_state = mips32_arch_state,
1219
1220         .target_request_data = NULL,
1221
1222         .halt = mips_m4k_halt,
1223         .resume = mips_m4k_resume,
1224         .step = mips_m4k_step,
1225
1226         .assert_reset = mips_m4k_assert_reset,
1227         .deassert_reset = mips_m4k_deassert_reset,
1228         .soft_reset_halt = mips_m4k_soft_reset_halt,
1229
1230         .get_gdb_reg_list = mips32_get_gdb_reg_list,
1231
1232         .read_memory = mips_m4k_read_memory,
1233         .write_memory = mips_m4k_write_memory,
1234         .bulk_write_memory = mips_m4k_bulk_write_memory,
1235         .checksum_memory = mips32_checksum_memory,
1236         .blank_check_memory = mips32_blank_check_memory,
1237
1238         .run_algorithm = mips32_run_algorithm,
1239
1240         .add_breakpoint = mips_m4k_add_breakpoint,
1241         .remove_breakpoint = mips_m4k_remove_breakpoint,
1242         .add_watchpoint = mips_m4k_add_watchpoint,
1243         .remove_watchpoint = mips_m4k_remove_watchpoint,
1244
1245         .commands = mips_m4k_command_handlers,
1246         .target_create = mips_m4k_target_create,
1247         .init_target = mips_m4k_init_target,
1248         .examine = mips_m4k_examine,
1249 };