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   1 /***************************************************************************
   2  *   Copyright (C) 2008 digenius technology GmbH.                          *
   3  *   Michael Bruck                                                         *
   4  *                                                                         *
   5  *   Copyright (C) 2008,2009 Oyvind Harboe oyvind.harboe@zylin.com         *
   6  *                                                                         *
   7  *   Copyright (C) 2008 Georg Acher <acher@in.tum.de>                      *
   8  *                                                                         *
   9  *   Copyright (C) 2009 David Brownell                                     *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  25  ***************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include "etm.h"
  32 #include "breakpoints.h"
  33 #include "arm11_dbgtap.h"
  34 #include "arm_simulator.h"
  35 #include <helper/time_support.h>
  36 #include "target_type.h"
  37 #include "algorithm.h"
  38 #include "register.h"
  39 #include "arm_opcodes.h"
  40
  41 #if 0
  42 #define _DEBUG_INSTRUCTION_EXECUTION_
  43 #endif
  44
  45
  46 static int arm11_step(struct target *target, int current,
  47                 uint32_t address, int handle_breakpoints);
  48
  49
  50 /** Check and if necessary take control of the system
  51  *
  52  * \param arm11         Target state variable.
  53  */
  54 static int arm11_check_init(struct arm11_common *arm11)
  55 {
  56         CHECK_RETVAL(arm11_read_DSCR(arm11));
  57
  58         if (!(arm11->dscr & DSCR_HALT_DBG_MODE)) {
  59                 LOG_DEBUG("DSCR %08x", (unsigned) arm11->dscr);
  60                 LOG_DEBUG("Bringing target into debug mode");
  61
  62                 arm11->dscr |= DSCR_HALT_DBG_MODE;
  63                 CHECK_RETVAL(arm11_write_DSCR(arm11, arm11->dscr));
  64
  65                 /* add further reset initialization here */
  66
  67                 arm11->simulate_reset_on_next_halt = true;
  68
  69                 if (arm11->dscr & DSCR_CORE_HALTED) {
  70                         /** \todo TODO: this needs further scrutiny because
  71                           * arm11_debug_entry() never gets called.  (WHY NOT?)
  72                           * As a result we don't read the actual register states from
  73                           * the target.
  74                           */
  75
  76                         arm11->arm.target->state = TARGET_HALTED;
  77                         arm_dpm_report_dscr(arm11->arm.dpm, arm11->dscr);
  78                 } else {
  79                         arm11->arm.target->state = TARGET_RUNNING;
  80                         arm11->arm.target->debug_reason = DBG_REASON_NOTHALTED;
  81                 }
  82
  83                 CHECK_RETVAL(arm11_sc7_clear_vbw(arm11));
  84         }
  85
  86         return ERROR_OK;
  87 }
  88
  89 /**
  90  * Save processor state.  This is called after a HALT instruction
  91  * succeeds, and on other occasions the processor enters debug mode
  92  * (breakpoint, watchpoint, etc).  Caller has updated arm11->dscr.
  93  */
  94 static int arm11_debug_entry(struct arm11_common *arm11)
  95 {
  96         int retval;
  97
  98         arm11->arm.target->state = TARGET_HALTED;
  99         arm_dpm_report_dscr(arm11->arm.dpm, arm11->dscr);
 100
 101         /* REVISIT entire cache should already be invalid !!! */
 102         register_cache_invalidate(arm11->arm.core_cache);
 103
 104         /* See e.g. ARM1136 TRM, "14.8.4 Entering Debug state" */
 105
 106         /* maybe save wDTR (pending DCC write to debug SW, e.g. libdcc) */
 107         arm11->is_wdtr_saved = !!(arm11->dscr & DSCR_DTR_TX_FULL);
 108         if (arm11->is_wdtr_saved) {
 109                 arm11_add_debug_SCAN_N(arm11, 0x05, ARM11_TAP_DEFAULT);
 110
 111                 arm11_add_IR(arm11, ARM11_INTEST, ARM11_TAP_DEFAULT);
 112
 113                 struct scan_field chain5_fields[3];
 114
 115                 arm11_setup_field(arm11, 32, NULL,
 116                         &arm11->saved_wdtr, chain5_fields + 0);
 117                 arm11_setup_field(arm11,  1, NULL, NULL, chain5_fields + 1);
 118                 arm11_setup_field(arm11,  1, NULL, NULL, chain5_fields + 2);
 119
 120                 arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(
 121                                 chain5_fields), chain5_fields, TAP_DRPAUSE);
 122
 123         }
 124
 125         /* DSCR: set the Execute ARM instruction enable bit.
 126          *
 127          * ARM1176 spec says this is needed only for wDTR/rDTR's "ITR mode",
 128          * but not to issue ITRs(?).  The ARMv7 arch spec says it's required
 129          * for executing instructions via ITR.
 130          */
 131         CHECK_RETVAL(arm11_write_DSCR(arm11, DSCR_ITR_EN | arm11->dscr));
 132
 133
 134         /* From the spec:
 135            Before executing any instruction in debug state you have to drain the write buffer.
 136            This ensures that no imprecise Data Aborts can return at a later point:*/
 137
 138         /** \todo TODO: Test drain write buffer. */
 139
 140 #if 0
 141         while (1) {
 142                 /* MRC p14,0,R0,c5,c10,0 */
 143                 /*      arm11_run_instr_no_data1(arm11, / *0xee150e1a* /0xe320f000); */
 144
 145                 /* mcr     15, 0, r0, cr7, cr10, {4} */
 146                 arm11_run_instr_no_data1(arm11, 0xee070f9a);
 147
 148                 uint32_t dscr = arm11_read_DSCR(arm11);
 149
 150                 LOG_DEBUG("DRAIN, DSCR %08x", dscr);
 151
 152                 if (dscr & ARM11_DSCR_STICKY_IMPRECISE_DATA_ABORT) {
 153                         arm11_run_instr_no_data1(arm11, 0xe320f000);
 154
 155                         dscr = arm11_read_DSCR(arm11);
 156
 157                         LOG_DEBUG("DRAIN, DSCR %08x (DONE)", dscr);
 158
 159                         break;
 160                 }
 161         }
 162 #endif
 163
 164         /* Save registers.
 165          *
 166          * NOTE:  ARM1136 TRM suggests saving just R0 here now, then
 167          * CPSR and PC after the rDTR stuff.  We do it all at once.
 168          */
 169         retval = arm_dpm_read_current_registers(&arm11->dpm);
 170         if (retval != ERROR_OK)
 171                 LOG_ERROR("DPM REG READ -- fail");
 172
 173         retval = arm11_run_instr_data_prepare(arm11);
 174         if (retval != ERROR_OK)
 175                 return retval;
 176
 177         /* maybe save rDTR (pending DCC read from debug SW, e.g. libdcc) */
 178         arm11->is_rdtr_saved = !!(arm11->dscr & DSCR_DTR_RX_FULL);
 179         if (arm11->is_rdtr_saved) {
 180                 /* MRC p14,0,R0,c0,c5,0 (move rDTR -> r0 (-> wDTR -> local var)) */
 181                 retval = arm11_run_instr_data_from_core_via_r0(arm11,
 182                                 0xEE100E15, &arm11->saved_rdtr);
 183                 if (retval != ERROR_OK)
 184                         return retval;
 185         }
 186
 187         /* REVISIT Now that we've saved core state, there's may also
 188          * be MMU and cache state to care about ...
 189          */
 190
 191         if (arm11->simulate_reset_on_next_halt) {
 192                 arm11->simulate_reset_on_next_halt = false;
 193
 194                 LOG_DEBUG("Reset c1 Control Register");
 195
 196                 /* Write 0 (reset value) to Control register 0 to disable MMU/Cache etc. */
 197
 198                 /* MCR p15,0,R0,c1,c0,0 */
 199                 retval = arm11_run_instr_data_to_core_via_r0(arm11, 0xee010f10, 0);
 200                 if (retval != ERROR_OK)
 201                         return retval;
 202
 203         }
 204
 205         if (arm11->arm.target->debug_reason == DBG_REASON_WATCHPOINT) {
 206                 uint32_t wfar;
 207
 208                 /* MRC p15, 0, <Rd>, c6, c0, 1 ; Read WFAR */
 209                 retval = arm11_run_instr_data_from_core_via_r0(arm11,
 210                                 ARMV4_5_MRC(15, 0, 0, 6, 0, 1),
 211                                 &wfar);
 212                 if (retval != ERROR_OK)
 213                         return retval;
 214                 arm_dpm_report_wfar(arm11->arm.dpm, wfar);
 215         }
 216
 217
 218         retval = arm11_run_instr_data_finish(arm11);
 219         if (retval != ERROR_OK)
 220                 return retval;
 221
 222         return ERROR_OK;
 223 }
 224
 225 /**
 226  * Restore processor state.  This is called in preparation for
 227  * the RESTART function.
 228  */
 229 static int arm11_leave_debug_state(struct arm11_common *arm11, bool bpwp)
 230 {
 231         int retval;
 232
 233         /* See e.g. ARM1136 TRM, "14.8.5 Leaving Debug state" */
 234
 235         /* NOTE:  the ARM1136 TRM suggests restoring all registers
 236          * except R0/PC/CPSR right now.  Instead, we do them all
 237          * at once, just a bit later on.
 238          */
 239
 240         /* REVISIT once we start caring about MMU and cache state,
 241          * address it here ...
 242          */
 243
 244         /* spec says clear wDTR and rDTR; we assume they are clear as
 245            otherwise our programming would be sloppy */
 246         {
 247                 CHECK_RETVAL(arm11_read_DSCR(arm11));
 248
 249                 if (arm11->dscr & (DSCR_DTR_RX_FULL | DSCR_DTR_TX_FULL)) {
 250                         /*
 251                         The wDTR/rDTR two registers that are used to send/receive data to/from
 252                         the core in tandem with corresponding instruction codes that are
 253                         written into the core. The RDTR FULL/WDTR FULL flag indicates that the
 254                         registers hold data that was written by one side (CPU or JTAG) and not
 255                         read out by the other side.
 256                         */
 257                         LOG_ERROR("wDTR/rDTR inconsistent (DSCR %08x)",
 258                                 (unsigned) arm11->dscr);
 259                         return ERROR_FAIL;
 260                 }
 261         }
 262
 263         /* maybe restore original wDTR */
 264         if (arm11->is_wdtr_saved) {
 265                 retval = arm11_run_instr_data_prepare(arm11);
 266                 if (retval != ERROR_OK)
 267                         return retval;
 268
 269                 /* MCR p14,0,R0,c0,c5,0 */
 270                 retval = arm11_run_instr_data_to_core_via_r0(arm11,
 271                                 0xee000e15, arm11->saved_wdtr);
 272                 if (retval != ERROR_OK)
 273                         return retval;
 274
 275                 retval = arm11_run_instr_data_finish(arm11);
 276                 if (retval != ERROR_OK)
 277                         return retval;
 278         }
 279
 280         /* restore CPSR, PC, and R0 ... after flushing any modified
 281          * registers.
 282          */
 283         CHECK_RETVAL(arm_dpm_write_dirty_registers(&arm11->dpm, bpwp));
 284
 285         CHECK_RETVAL(arm11_bpwp_flush(arm11));
 286
 287         register_cache_invalidate(arm11->arm.core_cache);
 288
 289         /* restore DSCR */
 290         CHECK_RETVAL(arm11_write_DSCR(arm11, arm11->dscr));
 291
 292         /* maybe restore rDTR */
 293         if (arm11->is_rdtr_saved) {
 294                 arm11_add_debug_SCAN_N(arm11, 0x05, ARM11_TAP_DEFAULT);
 295
 296                 arm11_add_IR(arm11, ARM11_EXTEST, ARM11_TAP_DEFAULT);
 297
 298                 struct scan_field chain5_fields[3];
 299
 300                 uint8_t Ready           = 0;                    /* ignored */
 301                 uint8_t Valid           = 0;                    /* ignored */
 302
 303                 arm11_setup_field(arm11, 32, &arm11->saved_rdtr,
 304                         NULL, chain5_fields + 0);
 305                 arm11_setup_field(arm11,  1, &Ready,    NULL, chain5_fields + 1);
 306                 arm11_setup_field(arm11,  1, &Valid,    NULL, chain5_fields + 2);
 307
 308                 arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(
 309                                 chain5_fields), chain5_fields, TAP_DRPAUSE);
 310         }
 311
 312         /* now processor is ready to RESTART */
 313
 314         return ERROR_OK;
 315 }
 316
 317 /* poll current target status */
 318 static int arm11_poll(struct target *target)
 319 {
 320         int retval;
 321         struct arm11_common *arm11 = target_to_arm11(target);
 322
 323         CHECK_RETVAL(arm11_check_init(arm11));
 324
 325         if (arm11->dscr & DSCR_CORE_HALTED) {
 326                 if (target->state != TARGET_HALTED) {
 327                         enum target_state old_state = target->state;
 328
 329                         LOG_DEBUG("enter TARGET_HALTED");
 330                         retval = arm11_debug_entry(arm11);
 331                         if (retval != ERROR_OK)
 332                                 return retval;
 333
 334                         target_call_event_callbacks(target,
 335                                 (old_state == TARGET_DEBUG_RUNNING)
 336                                 ? TARGET_EVENT_DEBUG_HALTED
 337                                 : TARGET_EVENT_HALTED);
 338                 }
 339         } else {
 340                 if (target->state != TARGET_RUNNING && target->state != TARGET_DEBUG_RUNNING) {
 341                         LOG_DEBUG("enter TARGET_RUNNING");
 342                         target->state                   = TARGET_RUNNING;
 343                         target->debug_reason    = DBG_REASON_NOTHALTED;
 344                 }
 345         }
 346
 347         return ERROR_OK;
 348 }
 349 /* architecture specific status reply */
 350 static int arm11_arch_state(struct target *target)
 351 {
 352         struct arm11_common *arm11 = target_to_arm11(target);
 353         int retval;
 354
 355         retval = arm_arch_state(target);
 356
 357         /* REVISIT also display ARM11-specific MMU and cache status ... */
 358
 359         if (target->debug_reason == DBG_REASON_WATCHPOINT)
 360                 LOG_USER("Watchpoint triggered at PC %#08x",
 361                         (unsigned) arm11->dpm.wp_pc);
 362
 363         return retval;
 364 }
 365
 366 /* target execution control */
 367 static int arm11_halt(struct target *target)
 368 {
 369         struct arm11_common *arm11 = target_to_arm11(target);
 370
 371         LOG_DEBUG("target->state: %s",
 372                 target_state_name(target));
 373
 374         if (target->state == TARGET_UNKNOWN)
 375                 arm11->simulate_reset_on_next_halt = true;
 376
 377         if (target->state == TARGET_HALTED) {
 378                 LOG_DEBUG("target was already halted");
 379                 return ERROR_OK;
 380         }
 381
 382         arm11_add_IR(arm11, ARM11_HALT, TAP_IDLE);
 383
 384         CHECK_RETVAL(jtag_execute_queue());
 385
 386         int i = 0;
 387
 388         while (1) {
 389                 CHECK_RETVAL(arm11_read_DSCR(arm11));
 390
 391                 if (arm11->dscr & DSCR_CORE_HALTED)
 392                         break;
 393
 394
 395                 long long then = 0;
 396                 if (i == 1000)
 397                         then = timeval_ms();
 398                 if (i >= 1000) {
 399                         if ((timeval_ms()-then) > 1000) {
 400                                 LOG_WARNING("Timeout (1000ms) waiting for instructions to complete");
 401                                 return ERROR_FAIL;
 402                         }
 403                 }
 404                 i++;
 405         }
 406
 407         enum target_state old_state     = target->state;
 408
 409         CHECK_RETVAL(arm11_debug_entry(arm11));
 410
 411         CHECK_RETVAL(
 412                 target_call_event_callbacks(target,
 413                         old_state ==
 414                         TARGET_DEBUG_RUNNING ? TARGET_EVENT_DEBUG_HALTED : TARGET_EVENT_HALTED));
 415
 416         return ERROR_OK;
 417 }
 418
 419 static uint32_t arm11_nextpc(struct arm11_common *arm11, int current, uint32_t address)
 420 {
 421         void *value = arm11->arm.pc->value;
 422
 423         if (!current)
 424                 buf_set_u32(value, 0, 32, address);
 425         else
 426                 address = buf_get_u32(value, 0, 32);
 427
 428         return address;
 429 }
 430
 431 static int arm11_resume(struct target *target, int current,
 432         uint32_t address, int handle_breakpoints, int debug_execution)
 433 {
 434         /*        LOG_DEBUG("current %d  address %08x  handle_breakpoints %d  debug_execution %d", */
 435         /*      current, address, handle_breakpoints, debug_execution); */
 436
 437         struct arm11_common *arm11 = target_to_arm11(target);
 438
 439         LOG_DEBUG("target->state: %s",
 440                 target_state_name(target));
 441
 442
 443         if (target->state != TARGET_HALTED) {
 444                 LOG_ERROR("Target not halted");
 445                 return ERROR_TARGET_NOT_HALTED;
 446         }
 447
 448         address = arm11_nextpc(arm11, current, address);
 449
 450         LOG_DEBUG("RESUME PC %08" PRIx32 "%s", address, !current ? "!" : "");
 451
 452         /* clear breakpoints/watchpoints and VCR*/
 453         CHECK_RETVAL(arm11_sc7_clear_vbw(arm11));
 454
 455         if (!debug_execution)
 456                 target_free_all_working_areas(target);
 457
 458         /* Should we skip over breakpoints matching the PC? */
 459         if (handle_breakpoints) {
 460                 struct breakpoint *bp;
 461
 462                 for (bp = target->breakpoints; bp; bp = bp->next) {
 463                         if (bp->address == address) {
 464                                 LOG_DEBUG("must step over %08" PRIx32 "", bp->address);
 465                                 arm11_step(target, 1, 0, 0);
 466                                 break;
 467                         }
 468                 }
 469         }
 470
 471         /* activate all breakpoints */
 472         if (true) {
 473                 struct breakpoint *bp;
 474                 unsigned brp_num = 0;
 475
 476                 for (bp = target->breakpoints; bp; bp = bp->next) {
 477                         struct arm11_sc7_action brp[2];
 478
 479                         brp[0].write    = 1;
 480                         brp[0].address  = ARM11_SC7_BVR0 + brp_num;
 481                         brp[0].value    = bp->address;
 482                         brp[1].write    = 1;
 483                         brp[1].address  = ARM11_SC7_BCR0 + brp_num;
 484                         brp[1].value    = 0x1 |
 485                                 (3 <<
 486                                  1) | (0x0F << 5) | (0 << 14) | (0 << 16) | (0 << 20) | (0 << 21);
 487
 488                         CHECK_RETVAL(arm11_sc7_run(arm11, brp, ARRAY_SIZE(brp)));
 489
 490                         LOG_DEBUG("Add BP %d at %08" PRIx32, brp_num,
 491                                 bp->address);
 492
 493                         brp_num++;
 494                 }
 495
 496                 if (arm11->vcr)
 497                         CHECK_RETVAL(arm11_sc7_set_vcr(arm11, arm11->vcr));
 498         }
 499
 500         /* activate all watchpoints and breakpoints */
 501         CHECK_RETVAL(arm11_leave_debug_state(arm11, true));
 502
 503         arm11_add_IR(arm11, ARM11_RESTART, TAP_IDLE);
 504
 505         CHECK_RETVAL(jtag_execute_queue());
 506
 507         int i = 0;
 508         while (1) {
 509                 CHECK_RETVAL(arm11_read_DSCR(arm11));
 510
 511                 LOG_DEBUG("DSCR %08x", (unsigned) arm11->dscr);
 512
 513                 if (arm11->dscr & DSCR_CORE_RESTARTED)
 514                         break;
 515
 516
 517                 long long then = 0;
 518                 if (i == 1000)
 519                         then = timeval_ms();
 520                 if (i >= 1000) {
 521                         if ((timeval_ms()-then) > 1000) {
 522                                 LOG_WARNING("Timeout (1000ms) waiting for instructions to complete");
 523                                 return ERROR_FAIL;
 524                         }
 525                 }
 526                 i++;
 527         }
 528
 529         target->debug_reason = DBG_REASON_NOTHALTED;
 530         if (!debug_execution)
 531                 target->state = TARGET_RUNNING;
 532         else
 533                 target->state = TARGET_DEBUG_RUNNING;
 534         CHECK_RETVAL(target_call_event_callbacks(target, TARGET_EVENT_RESUMED));
 535
 536         return ERROR_OK;
 537 }
 538
 539 static int arm11_step(struct target *target, int current,
 540         uint32_t address, int handle_breakpoints)
 541 {
 542         LOG_DEBUG("target->state: %s",
 543                 target_state_name(target));
 544
 545         if (target->state != TARGET_HALTED) {
 546                 LOG_WARNING("target was not halted");
 547                 return ERROR_TARGET_NOT_HALTED;
 548         }
 549
 550         struct arm11_common *arm11 = target_to_arm11(target);
 551
 552         address = arm11_nextpc(arm11, current, address);
 553
 554         LOG_DEBUG("STEP PC %08" PRIx32 "%s", address, !current ? "!" : "");
 555
 556
 557         /** \todo TODO: Thumb not supported here */
 558
 559         uint32_t next_instruction;
 560
 561         CHECK_RETVAL(arm11_read_memory_word(arm11, address, &next_instruction));
 562
 563         /* skip over BKPT */
 564         if ((next_instruction & 0xFFF00070) == 0xe1200070) {
 565                 address = arm11_nextpc(arm11, 0, address + 4);
 566                 LOG_DEBUG("Skipping BKPT %08" PRIx32, address);
 567         }
 568         /* skip over Wait for interrupt / Standby
 569          * mcr  15, 0, r?, cr7, cr0, {4} */
 570         else if ((next_instruction & 0xFFFF0FFF) == 0xee070f90) {
 571                 address = arm11_nextpc(arm11, 0, address + 4);
 572                 LOG_DEBUG("Skipping WFI %08" PRIx32, address);
 573         }
 574         /* ignore B to self */
 575         else if ((next_instruction & 0xFEFFFFFF) == 0xeafffffe)
 576                 LOG_DEBUG("Not stepping jump to self");
 577         else {
 578                 /** \todo TODO: check if break-/watchpoints make any sense at all in combination
 579                 * with this. */
 580
 581                 /** \todo TODO: check if disabling IRQs might be a good idea here. Alternatively
 582                 * the VCR might be something worth looking into. */
 583
 584
 585                 /* Set up breakpoint for stepping */
 586
 587                 struct arm11_sc7_action brp[2];
 588
 589                 brp[0].write    = 1;
 590                 brp[0].address  = ARM11_SC7_BVR0;
 591                 brp[1].write    = 1;
 592                 brp[1].address  = ARM11_SC7_BCR0;
 593
 594                 if (arm11->hardware_step) {
 595                         /* Hardware single stepping ("instruction address
 596                          * mismatch") is used if enabled.  It's not quite
 597                          * exactly "run one instruction"; "branch to here"
 598                          * loops won't break, neither will some other cases,
 599                          * but it's probably the best default.
 600                          *
 601                          * Hardware single stepping isn't supported on v6
 602                          * debug modules.  ARM1176 and v7 can support it...
 603                          *
 604                          * FIXME Thumb stepping likely needs to use 0x03
 605                          * or 0xc0 byte masks, not 0x0f.
 606                          */
 607                         brp[0].value   = address;
 608                         brp[1].value   = 0x1 | (3 << 1) | (0x0F << 5)
 609                                 | (0 << 14) | (0 << 16) | (0 << 20)
 610                                 | (2 << 21);
 611                 } else {
 612                         /* Sets a breakpoint on the next PC, as calculated
 613                          * by instruction set simulation.
 614                          *
 615                          * REVISIT stepping Thumb on ARM1156 requires Thumb2
 616                          * support from the simulator.
 617                          */
 618                         uint32_t next_pc;
 619                         int retval;
 620
 621                         retval = arm_simulate_step(target, &next_pc);
 622                         if (retval != ERROR_OK)
 623                                 return retval;
 624
 625                         brp[0].value    = next_pc;
 626                         brp[1].value    = 0x1 | (3 << 1) | (0x0F << 5)
 627                                 | (0 << 14) | (0 << 16) | (0 << 20)
 628                                 | (0 << 21);
 629                 }
 630
 631                 CHECK_RETVAL(arm11_sc7_run(arm11, brp, ARRAY_SIZE(brp)));
 632
 633                 /* resume */
 634
 635
 636                 if (arm11->step_irq_enable)
 637                         /* this disable should be redundant ... */
 638                         arm11->dscr &= ~DSCR_INT_DIS;
 639                 else
 640                         arm11->dscr |= DSCR_INT_DIS;
 641
 642
 643                 CHECK_RETVAL(arm11_leave_debug_state(arm11, handle_breakpoints));
 644
 645                 arm11_add_IR(arm11, ARM11_RESTART, TAP_IDLE);
 646
 647                 CHECK_RETVAL(jtag_execute_queue());
 648
 649                 /* wait for halt */
 650                 int i = 0;
 651
 652                 while (1) {
 653                         const uint32_t mask = DSCR_CORE_RESTARTED
 654                                 | DSCR_CORE_HALTED;
 655
 656                         CHECK_RETVAL(arm11_read_DSCR(arm11));
 657                         LOG_DEBUG("DSCR %08x e", (unsigned) arm11->dscr);
 658
 659                         if ((arm11->dscr & mask) == mask)
 660                                 break;
 661
 662                         long long then = 0;
 663                         if (i == 1000)
 664                                 then = timeval_ms();
 665                         if (i >= 1000) {
 666                                 if ((timeval_ms()-then) > 1000) {
 667                                         LOG_WARNING(
 668                                                 "Timeout (1000ms) waiting for instructions to complete");
 669                                         return ERROR_FAIL;
 670                                 }
 671                         }
 672                         i++;
 673                 }
 674
 675                 /* clear breakpoint */
 676                 CHECK_RETVAL(arm11_sc7_clear_vbw(arm11));
 677
 678                 /* save state */
 679                 CHECK_RETVAL(arm11_debug_entry(arm11));
 680
 681                 /* restore default state */
 682                 arm11->dscr &= ~DSCR_INT_DIS;
 683
 684         }
 685
 686         target->debug_reason = DBG_REASON_SINGLESTEP;
 687
 688         CHECK_RETVAL(target_call_event_callbacks(target, TARGET_EVENT_HALTED));
 689
 690         return ERROR_OK;
 691 }
 692
 693 static int arm11_assert_reset(struct target *target)
 694 {
 695         struct arm11_common *arm11 = target_to_arm11(target);
 696
 697         if (!(target_was_examined(target))) {
 698                 if (jtag_get_reset_config() & RESET_HAS_SRST)
 699                         jtag_add_reset(0, 1);
 700                 else {
 701                         LOG_WARNING("Reset is not asserted because the target is not examined.");
 702                         LOG_WARNING("Use a reset button or power cycle the target.");
 703                         return ERROR_TARGET_NOT_EXAMINED;
 704                 }
 705         } else {
 706
 707                 /* optionally catch reset vector */
 708                 if (target->reset_halt && !(arm11->vcr & 1))
 709                         CHECK_RETVAL(arm11_sc7_set_vcr(arm11, arm11->vcr | 1));
 710
 711                 /* Issue some kind of warm reset. */
 712                 if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT))
 713                         target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
 714                 else if (jtag_get_reset_config() & RESET_HAS_SRST) {
 715                         /* REVISIT handle "pulls" cases, if there's
 716                          * hardware that needs them to work.
 717                          */
 718                         jtag_add_reset(0, 1);
 719                 } else {
 720                         LOG_ERROR("%s: how to reset?", target_name(target));
 721                         return ERROR_FAIL;
 722                 }
 723         }
 724
 725         /* registers are now invalid */
 726         register_cache_invalidate(arm11->arm.core_cache);
 727
 728         target->state = TARGET_RESET;
 729
 730         return ERROR_OK;
 731 }
 732
 733 /*
 734  * - There is another bug in the arm11 core.  (iMX31 specific again?)
 735  *   When you generate an access to external logic (for example DDR
 736  *   controller via AHB bus) and that block is not configured (perhaps
 737  *   it is still held in reset), that transaction will never complete.
 738  *   This will hang arm11 core but it will also hang JTAG controller.
 739  *   Nothing short of srst assertion will bring it out of this.
 740  */
 741
 742 static int arm11_deassert_reset(struct target *target)
 743 {
 744         struct arm11_common *arm11 = target_to_arm11(target);
 745         int retval;
 746
 747         /* be certain SRST is off */
 748         jtag_add_reset(0, 0);
 749
 750         /* WORKAROUND i.MX31 problems:  SRST goofs the TAP, and resets
 751          * at least DSCR.  OMAP24xx doesn't show that problem, though
 752          * SRST-only reset seems to be problematic for other reasons.
 753          * (Secure boot sequences being one likelihood!)
 754          */
 755         jtag_add_tlr();
 756
 757         CHECK_RETVAL(arm11_poll(target));
 758
 759         if (target->reset_halt) {
 760                 if (target->state != TARGET_HALTED) {
 761                         LOG_WARNING("%s: ran after reset and before halt ...",
 762                                 target_name(target));
 763                         retval = target_halt(target);
 764                         if (retval != ERROR_OK)
 765                                 return retval;
 766                 }
 767         }
 768
 769         /* maybe restore vector catch config */
 770         if (target->reset_halt && !(arm11->vcr & 1))
 771                 CHECK_RETVAL(arm11_sc7_set_vcr(arm11, arm11->vcr));
 772
 773         return ERROR_OK;
 774 }
 775
 776 /* target memory access
 777  * size: 1 = byte (8bit), 2 = half-word (16bit), 4 = word (32bit)
 778  * count: number of items of <size>
 779  *
 780  * arm11_config_memrw_no_increment - in the future we may want to be able
 781  * to read/write a range of data to a "port". a "port" is an action on
 782  * read memory address for some peripheral.
 783  */
 784 static int arm11_read_memory_inner(struct target *target,
 785         uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer,
 786         bool arm11_config_memrw_no_increment)
 787 {
 788         /** \todo TODO: check if buffer cast to uint32_t* and uint16_t* might cause alignment
 789          *problems */
 790         int retval;
 791
 792         if (target->state != TARGET_HALTED) {
 793                 LOG_WARNING("target was not halted");
 794                 return ERROR_TARGET_NOT_HALTED;
 795         }
 796
 797         LOG_DEBUG("ADDR %08" PRIx32 "  SIZE %08" PRIx32 "  COUNT %08" PRIx32 "",
 798                 address,
 799                 size,
 800                 count);
 801
 802         struct arm11_common *arm11 = target_to_arm11(target);
 803
 804         retval = arm11_run_instr_data_prepare(arm11);
 805         if (retval != ERROR_OK)
 806                 return retval;
 807
 808         /* MRC p14,0,r0,c0,c5,0 */
 809         retval = arm11_run_instr_data_to_core1(arm11, 0xee100e15, address);
 810         if (retval != ERROR_OK)
 811                 return retval;
 812
 813         switch (size) {
 814                 case 1:
 815                         arm11->arm.core_cache->reg_list[1].dirty = true;
 816
 817                         for (size_t i = 0; i < count; i++) {
 818                                 /* ldrb    r1, [r0], #1 */
 819                                 /* ldrb    r1, [r0] */
 820                                 CHECK_RETVAL(arm11_run_instr_no_data1(arm11,
 821                                                 !arm11_config_memrw_no_increment ? 0xe4d01001 : 0xe5d01000));
 822
 823                                 uint32_t res;
 824                                 /* MCR p14,0,R1,c0,c5,0 */
 825                                 CHECK_RETVAL(arm11_run_instr_data_from_core(arm11, 0xEE001E15, &res, 1));
 826
 827                                 *buffer++ = res;
 828                         }
 829
 830                         break;
 831
 832                 case 2:
 833                 {
 834                         arm11->arm.core_cache->reg_list[1].dirty = true;
 835
 836                         for (size_t i = 0; i < count; i++) {
 837                                 /* ldrh    r1, [r0], #2 */
 838                                 CHECK_RETVAL(arm11_run_instr_no_data1(arm11,
 839                                                 !arm11_config_memrw_no_increment ? 0xe0d010b2 : 0xe1d010b0));
 840
 841                                 uint32_t res;
 842
 843                                 /* MCR p14,0,R1,c0,c5,0 */
 844                                 CHECK_RETVAL(arm11_run_instr_data_from_core(arm11, 0xEE001E15, &res, 1));
 845
 846                                 uint16_t svalue = res;
 847                                 memcpy(buffer + i * sizeof(uint16_t), &svalue, sizeof(uint16_t));
 848                         }
 849
 850                         break;
 851                 }
 852
 853                 case 4:
 854                 {
 855                         uint32_t instr = !arm11_config_memrw_no_increment ? 0xecb05e01 : 0xed905e00;
 856                         /** \todo TODO: buffer cast to uint32_t* causes alignment warnings */
 857                         uint32_t *words = (uint32_t *)(void *)buffer;
 858
 859                         /* LDC p14,c5,[R0],#4 */
 860                         /* LDC p14,c5,[R0] */
 861                         CHECK_RETVAL(arm11_run_instr_data_from_core(arm11, instr, words, count));
 862                         break;
 863                 }
 864         }
 865
 866         return arm11_run_instr_data_finish(arm11);
 867 }
 868
 869 static int arm11_read_memory(struct target *target,
 870         uint32_t address,
 871         uint32_t size,
 872         uint32_t count,
 873         uint8_t *buffer)
 874 {
 875         return arm11_read_memory_inner(target, address, size, count, buffer, false);
 876 }
 877
 878 /*
 879 * no_increment - in the future we may want to be able
 880 * to read/write a range of data to a "port". a "port" is an action on
 881 * read memory address for some peripheral.
 882 */
 883 static int arm11_write_memory_inner(struct target *target,
 884         uint32_t address, uint32_t size,
 885         uint32_t count, const uint8_t *buffer,
 886         bool no_increment)
 887 {
 888         int retval;
 889
 890         if (target->state != TARGET_HALTED) {
 891                 LOG_WARNING("target was not halted");
 892                 return ERROR_TARGET_NOT_HALTED;
 893         }
 894
 895         LOG_DEBUG("ADDR %08" PRIx32 "  SIZE %08" PRIx32 "  COUNT %08" PRIx32 "",
 896                 address,
 897                 size,
 898                 count);
 899
 900         struct arm11_common *arm11 = target_to_arm11(target);
 901
 902         retval = arm11_run_instr_data_prepare(arm11);
 903         if (retval != ERROR_OK)
 904                 return retval;
 905
 906         /* load r0 with buffer address
 907          * MRC p14,0,r0,c0,c5,0 */
 908         retval = arm11_run_instr_data_to_core1(arm11, 0xee100e15, address);
 909         if (retval != ERROR_OK)
 910                 return retval;
 911
 912         /* burst writes are not used for single words as those may well be
 913          * reset init script writes.
 914          *
 915          * The other advantage is that as burst writes are default, we'll
 916          * now exercise both burst and non-burst code paths with the
 917          * default settings, increasing code coverage.
 918          */
 919         bool burst = arm11->memwrite_burst && (count > 1);
 920
 921         switch (size) {
 922                 case 1:
 923                 {
 924                         arm11->arm.core_cache->reg_list[1].dirty = true;
 925
 926                         for (size_t i = 0; i < count; i++) {
 927                                 /* load r1 from DCC with byte data */
 928                                 /* MRC p14,0,r1,c0,c5,0 */
 929                                 retval = arm11_run_instr_data_to_core1(arm11, 0xee101e15, *buffer++);
 930                                 if (retval != ERROR_OK)
 931                                         return retval;
 932
 933                                 /* write r1 to memory */
 934                                 /* strb    r1, [r0], #1 */
 935                                 /* strb    r1, [r0] */
 936                                 retval = arm11_run_instr_no_data1(arm11,
 937                                                 !no_increment ? 0xe4c01001 : 0xe5c01000);
 938                                 if (retval != ERROR_OK)
 939                                         return retval;
 940                         }
 941
 942                         break;
 943                 }
 944
 945                 case 2:
 946                 {
 947                         arm11->arm.core_cache->reg_list[1].dirty = true;
 948
 949                         for (size_t i = 0; i < count; i++) {
 950                                 uint16_t value;
 951                                 memcpy(&value, buffer + i * sizeof(uint16_t), sizeof(uint16_t));
 952
 953                                 /* load r1 from DCC with halfword data */
 954                                 /* MRC p14,0,r1,c0,c5,0 */
 955                                 retval = arm11_run_instr_data_to_core1(arm11, 0xee101e15, value);
 956                                 if (retval != ERROR_OK)
 957                                         return retval;
 958
 959                                 /* write r1 to memory */
 960                                 /* strh    r1, [r0], #2 */
 961                                 /* strh    r1, [r0] */
 962                                 retval = arm11_run_instr_no_data1(arm11,
 963                                                 !no_increment ? 0xe0c010b2 : 0xe1c010b0);
 964                                 if (retval != ERROR_OK)
 965                                         return retval;
 966                         }
 967
 968                         break;
 969                 }
 970
 971                 case 4: {
 972                         /* stream word data through DCC directly to memory */
 973                         /* increment:           STC p14,c5,[R0],#4 */
 974                         /* no increment:        STC p14,c5,[R0]*/
 975                         uint32_t instr = !no_increment ? 0xeca05e01 : 0xed805e00;
 976
 977                         /** \todo TODO: buffer cast to uint32_t* causes alignment warnings */
 978                         uint32_t *words = (uint32_t *)(void *)buffer;
 979
 980                         /* "burst" here just means trusting each instruction executes
 981                          * fully before we run the next one:  per-word roundtrips, to
 982                          * check the Ready flag, are not used.
 983                          */
 984                         if (!burst)
 985                                 retval = arm11_run_instr_data_to_core(arm11,
 986                                                 instr, words, count);
 987                         else
 988                                 retval = arm11_run_instr_data_to_core_noack(arm11,
 989                                                 instr, words, count);
 990                         if (retval != ERROR_OK)
 991                                 return retval;
 992
 993                         break;
 994                 }
 995         }
 996
 997         /* r0 verification */
 998         if (!no_increment) {
 999                 uint32_t r0;
1000
1001                 /* MCR p14,0,R0,c0,c5,0 */
1002                 retval = arm11_run_instr_data_from_core(arm11, 0xEE000E15, &r0, 1);
1003                 if (retval != ERROR_OK)
1004                         return retval;
1005
1006                 if (address + size * count != r0) {
1007                         LOG_ERROR("Data transfer failed. Expected end "
1008                                 "address 0x%08x, got 0x%08x",
1009                                 (unsigned) (address + size * count),
1010                                 (unsigned) r0);
1011
1012                         if (burst)
1013                                 LOG_ERROR(
1014                                         "use 'arm11 memwrite burst disable' to disable fast burst mode");
1015
1016
1017                         if (arm11->memwrite_error_fatal)
1018                                 return ERROR_FAIL;
1019                 }
1020         }
1021
1022         return arm11_run_instr_data_finish(arm11);
1023 }
1024
1025 static int arm11_write_memory(struct target *target,
1026         uint32_t address, uint32_t size,
1027         uint32_t count, const uint8_t *buffer)
1028 {
1029         /* pointer increment matters only for multi-unit writes ...
1030          * not e.g. to a "reset the chip" controller.
1031          */
1032         return arm11_write_memory_inner(target, address, size,
1033                 count, buffer, count == 1);
1034 }
1035
1036 /* target break-/watchpoint control
1037 * rw: 0 = write, 1 = read, 2 = access
1038 */
1039 static int arm11_add_breakpoint(struct target *target,
1040         struct breakpoint *breakpoint)
1041 {
1042         struct arm11_common *arm11 = target_to_arm11(target);
1043
1044 #if 0
1045         if (breakpoint->type == BKPT_SOFT) {
1046                 LOG_INFO("sw breakpoint requested, but software breakpoints not enabled");
1047                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1048         }
1049 #endif
1050
1051         if (!arm11->free_brps) {
1052                 LOG_DEBUG("no breakpoint unit available for hardware breakpoint");
1053                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1054         }
1055
1056         if (breakpoint->length != 4) {
1057                 LOG_DEBUG("only breakpoints of four bytes length supported");
1058                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1059         }
1060
1061         arm11->free_brps--;
1062
1063         return ERROR_OK;
1064 }
1065
1066 static int arm11_remove_breakpoint(struct target *target,
1067         struct breakpoint *breakpoint)
1068 {
1069         struct arm11_common *arm11 = target_to_arm11(target);
1070
1071         arm11->free_brps++;
1072
1073         return ERROR_OK;
1074 }
1075
1076 static int arm11_target_create(struct target *target, Jim_Interp *interp)
1077 {
1078         struct arm11_common *arm11;
1079
1080         if (target->tap == NULL)
1081                 return ERROR_FAIL;
1082
1083         if (target->tap->ir_length != 5) {
1084                 LOG_ERROR("'target arm11' expects IR LENGTH = 5");
1085                 return ERROR_COMMAND_SYNTAX_ERROR;
1086         }
1087
1088         arm11 = calloc(1, sizeof *arm11);
1089         if (!arm11)
1090                 return ERROR_FAIL;
1091
1092         arm11->arm.core_type = ARM_MODE_ANY;
1093         arm_init_arch_info(target, &arm11->arm);
1094
1095         arm11->jtag_info.tap = target->tap;
1096         arm11->jtag_info.scann_size = 5;
1097         arm11->jtag_info.scann_instr = ARM11_SCAN_N;
1098         arm11->jtag_info.cur_scan_chain = ~0;   /* invalid/unknown */
1099         arm11->jtag_info.intest_instr = ARM11_INTEST;
1100
1101         arm11->memwrite_burst = true;
1102         arm11->memwrite_error_fatal = true;
1103
1104         return ERROR_OK;
1105 }
1106
1107 static int arm11_init_target(struct command_context *cmd_ctx,
1108         struct target *target)
1109 {
1110         /* Initialize anything we can set up without talking to the target */
1111         return ERROR_OK;
1112 }
1113
1114 /* talk to the target and set things up */
1115 static int arm11_examine(struct target *target)
1116 {
1117         int retval;
1118         char *type;
1119         struct arm11_common *arm11 = target_to_arm11(target);
1120         uint32_t didr, device_id;
1121         uint8_t implementor;
1122
1123         /* FIXME split into do-first-time and do-every-time logic ... */
1124
1125         /* check IDCODE */
1126
1127         arm11_add_IR(arm11, ARM11_IDCODE, ARM11_TAP_DEFAULT);
1128
1129         struct scan_field idcode_field;
1130
1131         arm11_setup_field(arm11, 32, NULL, &device_id, &idcode_field);
1132
1133         arm11_add_dr_scan_vc(arm11->arm.target->tap, 1, &idcode_field, TAP_DRPAUSE);
1134
1135         /* check DIDR */
1136
1137         arm11_add_debug_SCAN_N(arm11, 0x00, ARM11_TAP_DEFAULT);
1138
1139         arm11_add_IR(arm11, ARM11_INTEST, ARM11_TAP_DEFAULT);
1140
1141         struct scan_field chain0_fields[2];
1142
1143         arm11_setup_field(arm11, 32, NULL, &didr, chain0_fields + 0);
1144         arm11_setup_field(arm11,  8, NULL, &implementor, chain0_fields + 1);
1145
1146         arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(
1147                         chain0_fields), chain0_fields, TAP_IDLE);
1148
1149         CHECK_RETVAL(jtag_execute_queue());
1150
1151         /* assume the manufacturer id is ok; check the part # */
1152         switch ((device_id >> 12) & 0xFFFF) {
1153                 case 0x7B36:
1154                         type = "ARM1136";
1155                         break;
1156                 case 0x7B37:
1157                         type = "ARM11 MPCore";
1158                         break;
1159                 case 0x7B56:
1160                         type = "ARM1156";
1161                         break;
1162                 case 0x7B76:
1163                         arm11->arm.core_type = ARM_MODE_MON;
1164                         /* NOTE: could default arm11->hardware_step to true */
1165                         type = "ARM1176";
1166                         break;
1167                 default:
1168                         LOG_ERROR("unexpected ARM11 ID code");
1169                         return ERROR_FAIL;
1170         }
1171         LOG_INFO("found %s", type);
1172
1173         /* unlikely this could ever fail, but ... */
1174         switch ((didr >> 16) & 0x0F) {
1175                 case ARM11_DEBUG_V6:
1176                 case ARM11_DEBUG_V61:   /* supports security extensions */
1177                         break;
1178                 default:
1179                         LOG_ERROR("Only ARM v6 and v6.1 debug supported.");
1180                         return ERROR_FAIL;
1181         }
1182
1183         arm11->brp = ((didr >> 24) & 0x0F) + 1;
1184
1185         /** \todo TODO: reserve one brp slot if we allow breakpoints during step */
1186         arm11->free_brps = arm11->brp;
1187
1188         LOG_DEBUG("IDCODE %08" PRIx32 " IMPLEMENTOR %02x DIDR %08" PRIx32,
1189                 device_id, implementor, didr);
1190
1191         /* Build register cache "late", after target_init(), since we
1192          * want to know if this core supports Secure Monitor mode.
1193          */
1194         if (!target_was_examined(target))
1195                 CHECK_RETVAL(arm11_dpm_init(arm11, didr));
1196
1197         /* as a side-effect this reads DSCR and thus
1198          * clears the ARM11_DSCR_STICKY_PRECISE_DATA_ABORT / Sticky Precise Data Abort Flag
1199          * as suggested by the spec.
1200          */
1201
1202         retval = arm11_check_init(arm11);
1203         if (retval != ERROR_OK)
1204                 return retval;
1205
1206         /* ETM on ARM11 still uses original scanchain 6 access mode */
1207         if (arm11->arm.etm && !target_was_examined(target)) {
1208                 *register_get_last_cache_p(&target->reg_cache) =
1209                         etm_build_reg_cache(target, &arm11->jtag_info,
1210                                 arm11->arm.etm);
1211                 CHECK_RETVAL(etm_setup(target));
1212         }
1213
1214         target_set_examined(target);
1215
1216         return ERROR_OK;
1217 }
1218
1219 #define ARM11_BOOL_WRAPPER(name, print_name)    \
1220         COMMAND_HANDLER(arm11_handle_bool_ ## name) \
1221         { \
1222                 struct target *target = get_current_target(CMD_CTX); \
1223                 struct arm11_common *arm11 = target_to_arm11(target); \
1224                 \
1225                 return CALL_COMMAND_HANDLER(handle_command_parse_bool, \
1226                         &arm11->name, print_name); \
1227         }
1228
1229 ARM11_BOOL_WRAPPER(memwrite_burst, "memory write burst mode")
1230 ARM11_BOOL_WRAPPER(memwrite_error_fatal, "fatal error mode for memory writes")
1231 ARM11_BOOL_WRAPPER(step_irq_enable, "IRQs while stepping")
1232 ARM11_BOOL_WRAPPER(hardware_step, "hardware single step")
1233
1234 /* REVISIT handle the VCR bits like other ARMs:  use symbols for
1235  * input and output values.
1236  */
1237
1238 COMMAND_HANDLER(arm11_handle_vcr)
1239 {
1240         struct target *target = get_current_target(CMD_CTX);
1241         struct arm11_common *arm11 = target_to_arm11(target);
1242
1243         switch (CMD_ARGC) {
1244                 case 0:
1245                         break;
1246                 case 1:
1247                         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], arm11->vcr);
1248                         break;
1249                 default:
1250                         return ERROR_COMMAND_SYNTAX_ERROR;
1251         }
1252
1253         LOG_INFO("VCR 0x%08" PRIx32 "", arm11->vcr);
1254         return ERROR_OK;
1255 }
1256
1257 static const struct command_registration arm11_mw_command_handlers[] = {
1258         {
1259                 .name = "burst",
1260                 .handler = arm11_handle_bool_memwrite_burst,
1261                 .mode = COMMAND_ANY,
1262                 .help = "Display or modify flag controlling potentially "
1263                         "risky fast burst mode (default: enabled)",
1264                 .usage = "['enable'|'disable']",
1265         },
1266         {
1267                 .name = "error_fatal",
1268                 .handler = arm11_handle_bool_memwrite_error_fatal,
1269                 .mode = COMMAND_ANY,
1270                 .help = "Display or modify flag controlling transfer "
1271                         "termination on transfer errors"
1272                         " (default: enabled)",
1273                 .usage = "['enable'|'disable']",
1274         },
1275         COMMAND_REGISTRATION_DONE
1276 };
1277 static const struct command_registration arm11_any_command_handlers[] = {
1278         {
1279                 /* "hardware_step" is only here to check if the default
1280                  * simulate + breakpoint implementation is broken.
1281                  * TEMPORARY! NOT DOCUMENTED! */
1282                 .name = "hardware_step",
1283                 .handler = arm11_handle_bool_hardware_step,
1284                 .mode = COMMAND_ANY,
1285                 .help = "DEBUG ONLY - Hardware single stepping"
1286                         " (default: disabled)",
1287                 .usage = "['enable'|'disable']",
1288         },
1289         {
1290                 .name = "memwrite",
1291                 .mode = COMMAND_ANY,
1292                 .help = "memwrite command group",
1293                 .usage = "",
1294                 .chain = arm11_mw_command_handlers,
1295         },
1296         {
1297                 .name = "step_irq_enable",
1298                 .handler = arm11_handle_bool_step_irq_enable,
1299                 .mode = COMMAND_ANY,
1300                 .help = "Display or modify flag controlling interrupt "
1301                         "enable while stepping (default: disabled)",
1302                 .usage = "['enable'|'disable']",
1303         },
1304         {
1305                 .name = "vcr",
1306                 .handler = arm11_handle_vcr,
1307                 .mode = COMMAND_ANY,
1308                 .help = "Display or modify Vector Catch Register",
1309                 .usage = "[value]",
1310         },
1311         COMMAND_REGISTRATION_DONE
1312 };
1313
1314 static const struct command_registration arm11_command_handlers[] = {
1315         {
1316                 .chain = arm_command_handlers,
1317         },
1318         {
1319                 .chain = etm_command_handlers,
1320         },
1321         {
1322                 .name = "arm11",
1323                 .mode = COMMAND_ANY,
1324                 .help = "ARM11 command group",
1325                 .usage = "",
1326                 .chain = arm11_any_command_handlers,
1327         },
1328         COMMAND_REGISTRATION_DONE
1329 };
1330
1331 /** Holds methods for ARM11xx targets. */
1332 struct target_type arm11_target = {
1333         .name = "arm11",
1334
1335         .poll = arm11_poll,
1336         .arch_state = arm11_arch_state,
1337
1338         .halt = arm11_halt,
1339         .resume = arm11_resume,
1340         .step = arm11_step,
1341
1342         .assert_reset = arm11_assert_reset,
1343         .deassert_reset = arm11_deassert_reset,
1344
1345         .get_gdb_reg_list = arm_get_gdb_reg_list,
1346
1347         .read_memory = arm11_read_memory,
1348         .write_memory = arm11_write_memory,
1349
1350         .checksum_memory = arm_checksum_memory,
1351         .blank_check_memory = arm_blank_check_memory,
1352
1353         .add_breakpoint = arm11_add_breakpoint,
1354         .remove_breakpoint = arm11_remove_breakpoint,
1355
1356         .run_algorithm = armv4_5_run_algorithm,
1357
1358         .commands = arm11_command_handlers,
1359         .target_create = arm11_target_create,
1360         .init_target = arm11_init_target,
1361         .examine = arm11_examine,
1362 };