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   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Mathias Kuester                                 *
   3  *   Mathias Kuester <kesmtp@freenet.de>                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2011 by Spencer Oliver                                  *
   6  *   spen@spen-soft.co.uk                                                  *
   7  *                                                                         *
   8  *   revised:  4/25/13 by brent@mbari.org [DCC target request support]     *
   9  *                                                                         *
  10  *   This program is free software; you can redistribute it and/or modify  *
  11  *   it under the terms of the GNU General Public License as published by  *
  12  *   the Free Software Foundation; either version 2 of the License, or     *
  13  *   (at your option) any later version.                                   *
  14  *                                                                         *
  15  *   This program is distributed in the hope that it will be useful,       *
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  18  *   GNU General Public License for more details.                          *
  19  *                                                                         *
  20  *   You should have received a copy of the GNU General Public License     *
  21  *   along with this program; if not, write to the                         *
  22  *   Free Software Foundation, Inc.,                                       *
  23  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  24  ***************************************************************************/
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "jtag/jtag.h"
  31 #include "jtag/hla/hla_transport.h"
  32 #include "jtag/hla/hla_interface.h"
  33 #include "jtag/hla/hla_layout.h"
  34 #include "register.h"
  35 #include "algorithm.h"
  36 #include "target.h"
  37 #include "breakpoints.h"
  38 #include "target_type.h"
  39 #include "armv7m.h"
  40 #include "cortex_m.h"
  41 #include "arm_semihosting.h"
  42 #include "target_request.h"
  43
  44 #define savedDCRDR  dbgbase  /* FIXME: using target->dbgbase to preserve DCRDR */
  45
  46 #define ARMV7M_SCS_DCRSR        DCB_DCRSR
  47 #define ARMV7M_SCS_DCRDR        DCB_DCRDR
  48
  49 static inline struct hl_interface_s *target_to_adapter(struct target *target)
  50 {
  51         return target->tap->priv;
  52 }
  53
  54 static int adapter_load_core_reg_u32(struct target *target,
  55                 uint32_t num, uint32_t *value)
  56 {
  57         int retval;
  58         struct hl_interface_s *adapter = target_to_adapter(target);
  59
  60         LOG_DEBUG("%s", __func__);
  61
  62         /* NOTE:  we "know" here that the register identifiers used
  63          * in the v7m header match the Cortex-M3 Debug Core Register
  64          * Selector values for R0..R15, xPSR, MSP, and PSP.
  65          */
  66         switch (num) {
  67         case 0 ... 18:
  68                 /* read a normal core register */
  69                 retval = adapter->layout->api->read_reg(adapter->fd, num, value);
  70
  71                 if (retval != ERROR_OK) {
  72                         LOG_ERROR("JTAG failure %i", retval);
  73                         return ERROR_JTAG_DEVICE_ERROR;
  74                 }
  75                 LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "", (int)num, *value);
  76                 break;
  77
  78         case ARMV7M_FPSID:
  79         case ARMV7M_FPEXC:
  80                 *value = 0;
  81                 break;
  82
  83         case ARMV7M_FPSCR:
  84                 /* Floating-point Status and Registers */
  85                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, 33);
  86                 if (retval != ERROR_OK)
  87                         return retval;
  88                 retval = target_read_u32(target, ARMV7M_SCS_DCRDR, value);
  89                 if (retval != ERROR_OK)
  90                         return retval;
  91                 LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "", (int)num, *value);
  92                 break;
  93
  94         case ARMV7M_S0 ... ARMV7M_S31:
  95                 /* Floating-point Status and Registers */
  96                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, num-ARMV7M_S0+64);
  97                 if (retval != ERROR_OK)
  98                         return retval;
  99                 retval = target_read_u32(target, ARMV7M_SCS_DCRDR, value);
 100                 if (retval != ERROR_OK)
 101                         return retval;
 102                 LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "", (int)num, *value);
 103                 break;
 104
 105         case ARMV7M_D0 ... ARMV7M_D15:
 106                 value = 0;
 107                 break;
 108
 109         case ARMV7M_PRIMASK:
 110         case ARMV7M_BASEPRI:
 111         case ARMV7M_FAULTMASK:
 112         case ARMV7M_CONTROL:
 113                 /* Cortex-M3 packages these four registers as bitfields
 114                  * in one Debug Core register.  So say r0 and r2 docs;
 115                  * it was removed from r1 docs, but still works.
 116                  */
 117                 retval = adapter->layout->api->read_reg(adapter->fd, 20, value);
 118                 if (retval != ERROR_OK)
 119                         return retval;
 120
 121                 switch (num) {
 122                 case ARMV7M_PRIMASK:
 123                         *value = buf_get_u32((uint8_t *) value, 0, 1);
 124                         break;
 125
 126                 case ARMV7M_BASEPRI:
 127                         *value = buf_get_u32((uint8_t *) value, 8, 8);
 128                         break;
 129
 130                 case ARMV7M_FAULTMASK:
 131                         *value = buf_get_u32((uint8_t *) value, 16, 1);
 132                         break;
 133
 134                 case ARMV7M_CONTROL:
 135                         *value = buf_get_u32((uint8_t *) value, 24, 2);
 136                         break;
 137                 }
 138
 139                 LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "",
 140                           (int)num, *value);
 141                 break;
 142
 143         default:
 144                 return ERROR_COMMAND_SYNTAX_ERROR;
 145         }
 146
 147         return ERROR_OK;
 148 }
 149
 150 static int adapter_store_core_reg_u32(struct target *target,
 151                 uint32_t num, uint32_t value)
 152 {
 153         int retval;
 154         uint32_t reg;
 155         struct armv7m_common *armv7m = target_to_armv7m(target);
 156         struct hl_interface_s *adapter = target_to_adapter(target);
 157
 158         LOG_DEBUG("%s", __func__);
 159
 160 #ifdef ARMV7_GDB_HACKS
 161         /* If the LR register is being modified, make sure it will put us
 162          * in "thumb" mode, or an INVSTATE exception will occur. This is a
 163          * hack to deal with the fact that gdb will sometimes "forge"
 164          * return addresses, and doesn't set the LSB correctly (i.e., when
 165          * printing expressions containing function calls, it sets LR = 0.)
 166          * Valid exception return codes have bit 0 set too.
 167          */
 168         if (num == ARMV7M_R14)
 169                 value |= 0x01;
 170 #endif
 171
 172         /* NOTE:  we "know" here that the register identifiers used
 173          * in the v7m header match the Cortex-M3 Debug Core Register
 174          * Selector values for R0..R15, xPSR, MSP, and PSP.
 175          */
 176         switch (num) {
 177         case 0 ... 18:
 178                 retval = adapter->layout->api->write_reg(adapter->fd, num, value);
 179
 180                 if (retval != ERROR_OK) {
 181                         struct reg *r;
 182
 183                         LOG_ERROR("JTAG failure");
 184                         r = armv7m->arm.core_cache->reg_list + num;
 185                         r->dirty = r->valid;
 186                         return ERROR_JTAG_DEVICE_ERROR;
 187                 }
 188                 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
 189                 break;
 190
 191         case ARMV7M_FPSID:
 192         case ARMV7M_FPEXC:
 193                 break;
 194
 195         case ARMV7M_FPSCR:
 196                 /* Floating-point Status and Registers */
 197                 retval = target_write_u32(target, ARMV7M_SCS_DCRDR, value);
 198                 if (retval != ERROR_OK)
 199                         return retval;
 200                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, 33 | (1<<16));
 201                 if (retval != ERROR_OK)
 202                         return retval;
 203                 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
 204                 break;
 205
 206         case ARMV7M_S0 ... ARMV7M_S31:
 207                 /* Floating-point Status and Registers */
 208                 retval = target_write_u32(target, ARMV7M_SCS_DCRDR, value);
 209                 if (retval != ERROR_OK)
 210                         return retval;
 211                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, (num-ARMV7M_S0+64) | (1<<16));
 212                 if (retval != ERROR_OK)
 213                         return retval;
 214                 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
 215                 break;
 216
 217         case ARMV7M_D0 ... ARMV7M_D15:
 218                 break;
 219
 220         case ARMV7M_PRIMASK:
 221         case ARMV7M_BASEPRI:
 222         case ARMV7M_FAULTMASK:
 223         case ARMV7M_CONTROL:
 224                 /* Cortex-M3 packages these four registers as bitfields
 225                  * in one Debug Core register.  So say r0 and r2 docs;
 226                  * it was removed from r1 docs, but still works.
 227                  */
 228
 229                 adapter->layout->api->read_reg(adapter->fd, 20, &reg);
 230
 231                 switch (num) {
 232                 case ARMV7M_PRIMASK:
 233                         buf_set_u32((uint8_t *) &reg, 0, 1, value);
 234                         break;
 235
 236                 case ARMV7M_BASEPRI:
 237                         buf_set_u32((uint8_t *) &reg, 8, 8, value);
 238                         break;
 239
 240                 case ARMV7M_FAULTMASK:
 241                         buf_set_u32((uint8_t *) &reg, 16, 1, value);
 242                         break;
 243
 244                 case ARMV7M_CONTROL:
 245                         buf_set_u32((uint8_t *) &reg, 24, 2, value);
 246                         break;
 247                 }
 248
 249                 adapter->layout->api->write_reg(adapter->fd, 20, reg);
 250
 251                 LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value);
 252                 break;
 253
 254         default:
 255                 return ERROR_COMMAND_SYNTAX_ERROR;
 256         }
 257
 258         return ERROR_OK;
 259 }
 260
 261 static int adapter_examine_debug_reason(struct target *target)
 262 {
 263         if ((target->debug_reason != DBG_REASON_DBGRQ)
 264                         && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
 265                 target->debug_reason = DBG_REASON_BREAKPOINT;
 266         }
 267
 268         return ERROR_OK;
 269 }
 270
 271 static int hl_dcc_read(struct hl_interface_s *hl_if, uint8_t *value, uint8_t *ctrl)
 272 {
 273         uint16_t dcrdr;
 274         int retval = hl_if->layout->api->read_mem8(hl_if->fd,
 275                                                                 DCB_DCRDR, sizeof(dcrdr), (uint8_t *)&dcrdr);
 276         if (retval == ERROR_OK) {
 277             *ctrl = (uint8_t)dcrdr;
 278             *value = (uint8_t)(dcrdr >> 8);
 279
 280             LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
 281
 282             if (dcrdr & 1) {
 283                         /* write ack back to software dcc register
 284                          * to signify we have read data */
 285                         /* atomically clear just the byte containing the busy bit */
 286                         static const uint8_t zero;
 287                         retval = hl_if->layout->api->write_mem8(
 288                                                 hl_if->fd, DCB_DCRDR, 1, &zero);
 289                 }
 290         }
 291         return retval;
 292 }
 293
 294 static int hl_target_request_data(struct target *target,
 295         uint32_t size, uint8_t *buffer)
 296 {
 297         struct hl_interface_s *hl_if = target_to_adapter(target);
 298         uint8_t data;
 299         uint8_t ctrl;
 300         uint32_t i;
 301
 302         for (i = 0; i < (size * 4); i++) {
 303                 hl_dcc_read(hl_if, &data, &ctrl);
 304                 buffer[i] = data;
 305         }
 306
 307         return ERROR_OK;
 308 }
 309
 310 static int hl_handle_target_request(void *priv)
 311 {
 312         struct target *target = priv;
 313         if (!target_was_examined(target))
 314                 return ERROR_OK;
 315         struct hl_interface_s *hl_if = target_to_adapter(target);
 316
 317         if (!target->dbg_msg_enabled)
 318                 return ERROR_OK;
 319
 320         if (target->state == TARGET_RUNNING) {
 321                 uint8_t data;
 322                 uint8_t ctrl;
 323
 324                 hl_dcc_read(hl_if, &data, &ctrl);
 325
 326                 /* check if we have data */
 327                 if (ctrl & (1 << 0)) {
 328                         uint32_t request;
 329
 330                         /* we assume target is quick enough */
 331                         request = data;
 332                         hl_dcc_read(hl_if, &data, &ctrl);
 333                         request |= (data << 8);
 334                         hl_dcc_read(hl_if, &data, &ctrl);
 335                         request |= (data << 16);
 336                         hl_dcc_read(hl_if, &data, &ctrl);
 337                         request |= (data << 24);
 338                         target_request(target, request);
 339                 }
 340         }
 341
 342         return ERROR_OK;
 343 }
 344
 345 static int adapter_init_arch_info(struct target *target,
 346                                        struct cortex_m3_common *cortex_m3,
 347                                        struct jtag_tap *tap)
 348 {
 349         struct armv7m_common *armv7m;
 350
 351         LOG_DEBUG("%s", __func__);
 352
 353         armv7m = &cortex_m3->armv7m;
 354         armv7m_init_arch_info(target, armv7m);
 355
 356         armv7m->load_core_reg_u32 = adapter_load_core_reg_u32;
 357         armv7m->store_core_reg_u32 = adapter_store_core_reg_u32;
 358
 359         armv7m->examine_debug_reason = adapter_examine_debug_reason;
 360         armv7m->stlink = true;
 361
 362         target_register_timer_callback(hl_handle_target_request, 1, 1, target);
 363
 364         return ERROR_OK;
 365 }
 366
 367 static int adapter_init_target(struct command_context *cmd_ctx,
 368                                     struct target *target)
 369 {
 370         LOG_DEBUG("%s", __func__);
 371
 372         armv7m_build_reg_cache(target);
 373
 374         return ERROR_OK;
 375 }
 376
 377 static int adapter_target_create(struct target *target,
 378                 Jim_Interp *interp)
 379 {
 380         LOG_DEBUG("%s", __func__);
 381
 382         struct cortex_m3_common *cortex_m3 = calloc(1, sizeof(struct cortex_m3_common));
 383
 384         if (!cortex_m3)
 385                 return ERROR_COMMAND_SYNTAX_ERROR;
 386
 387         adapter_init_arch_info(target, cortex_m3, target->tap);
 388
 389         return ERROR_OK;
 390 }
 391
 392 static int adapter_load_context(struct target *target)
 393 {
 394         struct armv7m_common *armv7m = target_to_armv7m(target);
 395         int num_regs = armv7m->arm.core_cache->num_regs;
 396
 397         for (int i = 0; i < num_regs; i++) {
 398
 399                 struct reg *r = &armv7m->arm.core_cache->reg_list[i];
 400                 if (!r->valid)
 401                         armv7m->arm.read_core_reg(target, r, i, ARM_MODE_ANY);
 402         }
 403
 404         return ERROR_OK;
 405 }
 406
 407 static int adapter_debug_entry(struct target *target)
 408 {
 409         struct hl_interface_s *adapter = target_to_adapter(target);
 410         struct armv7m_common *armv7m = target_to_armv7m(target);
 411         struct arm *arm = &armv7m->arm;
 412         struct reg *r;
 413         uint32_t xPSR;
 414         int retval;
 415
 416         /* preserve the DCRDR across halts */
 417         retval = target_read_u32(target, DCB_DCRDR, &target->savedDCRDR);
 418         if (retval != ERROR_OK)
 419                 return retval;
 420
 421         retval = armv7m->examine_debug_reason(target);
 422         if (retval != ERROR_OK)
 423                 return retval;
 424
 425         adapter_load_context(target);
 426
 427         /* make sure we clear the vector catch bit */
 428         adapter->layout->api->write_debug_reg(adapter->fd, DCB_DEMCR, TRCENA);
 429
 430         r = arm->core_cache->reg_list + ARMV7M_xPSR;
 431         xPSR = buf_get_u32(r->value, 0, 32);
 432
 433         /* Are we in an exception handler */
 434         if (xPSR & 0x1FF) {
 435                 armv7m->exception_number = (xPSR & 0x1FF);
 436
 437                 arm->core_mode = ARM_MODE_HANDLER;
 438                 arm->map = armv7m_msp_reg_map;
 439         } else {
 440                 unsigned control = buf_get_u32(arm->core_cache
 441                                 ->reg_list[ARMV7M_CONTROL].value, 0, 2);
 442
 443                 /* is this thread privileged? */
 444                 arm->core_mode = control & 1
 445                                 ? ARM_MODE_USER_THREAD
 446                                 : ARM_MODE_THREAD;
 447
 448                 /* which stack is it using? */
 449                 if (control & 2)
 450                         arm->map = armv7m_psp_reg_map;
 451                 else
 452                         arm->map = armv7m_msp_reg_map;
 453
 454                 armv7m->exception_number = 0;
 455         }
 456
 457         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%08" PRIx32 ", target->state: %s",
 458                 arm_mode_name(arm->core_mode),
 459                 *(uint32_t *)(arm->pc->value),
 460                 target_state_name(target));
 461
 462         return retval;
 463 }
 464
 465 static int adapter_poll(struct target *target)
 466 {
 467         enum target_state state;
 468         struct hl_interface_s *adapter = target_to_adapter(target);
 469         struct armv7m_common *armv7m = target_to_armv7m(target);
 470         enum target_state prev_target_state = target->state;
 471
 472         state = adapter->layout->api->state(adapter->fd);
 473
 474         if (state == TARGET_UNKNOWN) {
 475                 LOG_ERROR("jtag status contains invalid mode value - communication failure");
 476                 return ERROR_TARGET_FAILURE;
 477         }
 478
 479         if (target->state == state)
 480                 return ERROR_OK;
 481
 482         if (state == TARGET_HALTED) {
 483                 target->state = state;
 484
 485                 int retval = adapter_debug_entry(target);
 486                 if (retval != ERROR_OK)
 487                         return retval;
 488
 489                 if (prev_target_state == TARGET_DEBUG_RUNNING) {
 490                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 491                 } else {
 492                         if (arm_semihosting(target, &retval) != 0)
 493                                 return retval;
 494
 495                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 496                 }
 497
 498                 LOG_DEBUG("halted: PC: 0x%08x", buf_get_u32(armv7m->arm.pc->value, 0, 32));
 499         }
 500
 501         return ERROR_OK;
 502 }
 503
 504 static int adapter_assert_reset(struct target *target)
 505 {
 506         int res = ERROR_OK;
 507         struct hl_interface_s *adapter = target_to_adapter(target);
 508         struct armv7m_common *armv7m = target_to_armv7m(target);
 509         bool use_srst_fallback = true;
 510
 511         LOG_DEBUG("%s", __func__);
 512
 513         enum reset_types jtag_reset_config = jtag_get_reset_config();
 514
 515         bool srst_asserted = false;
 516
 517         if ((jtag_reset_config & RESET_HAS_SRST) &&
 518             (jtag_reset_config & RESET_SRST_NO_GATING)) {
 519                 jtag_add_reset(0, 1);
 520                 res = adapter->layout->api->assert_srst(adapter->fd, 0);
 521                 srst_asserted = true;
 522         }
 523
 524         adapter->layout->api->write_debug_reg(adapter->fd, DCB_DHCSR, DBGKEY|C_DEBUGEN);
 525
 526         /* only set vector catch if halt is requested */
 527         if (target->reset_halt)
 528                 adapter->layout->api->write_debug_reg(adapter->fd, DCB_DEMCR, TRCENA|VC_CORERESET);
 529         else
 530                 adapter->layout->api->write_debug_reg(adapter->fd, DCB_DEMCR, TRCENA);
 531
 532         if (jtag_reset_config & RESET_HAS_SRST) {
 533                 if (!srst_asserted) {
 534                         jtag_add_reset(0, 1);
 535                         res = adapter->layout->api->assert_srst(adapter->fd, 0);
 536                 }
 537                 if (res == ERROR_COMMAND_NOTFOUND)
 538                         LOG_ERROR("Hardware srst not supported, falling back to software reset");
 539                 else if (res == ERROR_OK) {
 540                         /* hardware srst supported */
 541                         use_srst_fallback = false;
 542                 }
 543         }
 544
 545         if (use_srst_fallback) {
 546                 /* stlink v1 api does not support hardware srst, so we use a software reset fallback */
 547                 adapter->layout->api->write_debug_reg(adapter->fd, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ);
 548         }
 549
 550         res = adapter->layout->api->reset(adapter->fd);
 551
 552         if (res != ERROR_OK)
 553                 return res;
 554
 555         /* registers are now invalid */
 556         register_cache_invalidate(armv7m->arm.core_cache);
 557
 558         if (target->reset_halt) {
 559                 target->state = TARGET_RESET;
 560                 target->debug_reason = DBG_REASON_DBGRQ;
 561         } else {
 562                 target->state = TARGET_HALTED;
 563         }
 564
 565         return ERROR_OK;
 566 }
 567
 568 static int adapter_deassert_reset(struct target *target)
 569 {
 570         struct hl_interface_s *adapter = target_to_adapter(target);
 571
 572         enum reset_types jtag_reset_config = jtag_get_reset_config();
 573
 574         LOG_DEBUG("%s", __func__);
 575
 576         if (jtag_reset_config & RESET_HAS_SRST)
 577                 adapter->layout->api->assert_srst(adapter->fd, 1);
 578
 579         /* virtual deassert reset, we need it for the internal
 580          * jtag state machine
 581          */
 582         jtag_add_reset(0, 0);
 583
 584         target->savedDCRDR = 0;  /* clear both DCC busy bits on initial resume */
 585
 586         return target->reset_halt ? ERROR_OK : target_resume(target, 1, 0, 0, 0);
 587 }
 588
 589 static int adapter_halt(struct target *target)
 590 {
 591         int res;
 592         struct hl_interface_s *adapter = target_to_adapter(target);
 593
 594         LOG_DEBUG("%s", __func__);
 595
 596         if (target->state == TARGET_HALTED) {
 597                 LOG_DEBUG("target was already halted");
 598                 return ERROR_OK;
 599         }
 600
 601         if (target->state == TARGET_UNKNOWN)
 602                 LOG_WARNING("target was in unknown state when halt was requested");
 603
 604         res = adapter->layout->api->halt(adapter->fd);
 605
 606         if (res != ERROR_OK)
 607                 return res;
 608
 609         target->debug_reason = DBG_REASON_DBGRQ;
 610
 611         return ERROR_OK;
 612 }
 613
 614 static int adapter_resume(struct target *target, int current,
 615                 uint32_t address, int handle_breakpoints,
 616                 int debug_execution)
 617 {
 618         int res;
 619         struct hl_interface_s *adapter = target_to_adapter(target);
 620         struct armv7m_common *armv7m = target_to_armv7m(target);
 621         uint32_t resume_pc;
 622         struct breakpoint *breakpoint = NULL;
 623         struct reg *pc;
 624
 625         LOG_DEBUG("%s %d 0x%08x %d %d", __func__, current, address,
 626                         handle_breakpoints, debug_execution);
 627
 628         if (target->state != TARGET_HALTED) {
 629                 LOG_WARNING("target not halted");
 630                 return ERROR_TARGET_NOT_HALTED;
 631         }
 632
 633         if (!debug_execution) {
 634                 target_free_all_working_areas(target);
 635                 cortex_m3_enable_breakpoints(target);
 636                 cortex_m3_enable_watchpoints(target);
 637         }
 638
 639         pc = armv7m->arm.pc;
 640         if (!current) {
 641                 buf_set_u32(pc->value, 0, 32, address);
 642                 pc->dirty = true;
 643                 pc->valid = true;
 644         }
 645
 646         if (!breakpoint_find(target, buf_get_u32(pc->value, 0, 32))
 647                         && !debug_execution) {
 648                 armv7m_maybe_skip_bkpt_inst(target, NULL);
 649         }
 650
 651         resume_pc = buf_get_u32(pc->value, 0, 32);
 652
 653         /* write any user vector flags */
 654         res = target_write_u32(target, DCB_DEMCR, TRCENA | armv7m->demcr);
 655         if (res != ERROR_OK)
 656                 return res;
 657
 658         armv7m_restore_context(target);
 659
 660         /* restore savedDCRDR */
 661         res = target_write_u32(target, DCB_DCRDR, target->savedDCRDR);
 662         if (res != ERROR_OK)
 663                 return res;
 664
 665         /* registers are now invalid */
 666         register_cache_invalidate(armv7m->arm.core_cache);
 667
 668         /* the front-end may request us not to handle breakpoints */
 669         if (handle_breakpoints) {
 670                 /* Single step past breakpoint at current address */
 671                 breakpoint = breakpoint_find(target, resume_pc);
 672                 if (breakpoint) {
 673                         LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 " (ID: %d)",
 674                                         breakpoint->address,
 675                                         breakpoint->unique_id);
 676                         cortex_m3_unset_breakpoint(target, breakpoint);
 677
 678                         res = adapter->layout->api->step(adapter->fd);
 679
 680                         if (res != ERROR_OK)
 681                                 return res;
 682
 683                         cortex_m3_set_breakpoint(target, breakpoint);
 684                 }
 685         }
 686
 687         res = adapter->layout->api->run(adapter->fd);
 688
 689         if (res != ERROR_OK)
 690                 return res;
 691
 692         target->debug_reason = DBG_REASON_NOTHALTED;
 693
 694         if (!debug_execution) {
 695                 target->state = TARGET_RUNNING;
 696                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 697         } else {
 698                 target->state = TARGET_DEBUG_RUNNING;
 699                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 700         }
 701
 702         return ERROR_OK;
 703 }
 704
 705 static int adapter_step(struct target *target, int current,
 706                 uint32_t address, int handle_breakpoints)
 707 {
 708         int res;
 709         struct hl_interface_s *adapter = target_to_adapter(target);
 710         struct armv7m_common *armv7m = target_to_armv7m(target);
 711         struct breakpoint *breakpoint = NULL;
 712         struct reg *pc = armv7m->arm.pc;
 713         bool bkpt_inst_found = false;
 714
 715         LOG_DEBUG("%s", __func__);
 716
 717         if (target->state != TARGET_HALTED) {
 718                 LOG_WARNING("target not halted");
 719                 return ERROR_TARGET_NOT_HALTED;
 720         }
 721
 722         if (!current) {
 723                 buf_set_u32(pc->value, 0, 32, address);
 724                 pc->dirty = true;
 725                 pc->valid = true;
 726         }
 727
 728         uint32_t pc_value = buf_get_u32(pc->value, 0, 32);
 729
 730         /* the front-end may request us not to handle breakpoints */
 731         if (handle_breakpoints) {
 732                 breakpoint = breakpoint_find(target, pc_value);
 733                 if (breakpoint)
 734                         cortex_m3_unset_breakpoint(target, breakpoint);
 735         }
 736
 737         armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found);
 738
 739         target->debug_reason = DBG_REASON_SINGLESTEP;
 740
 741         armv7m_restore_context(target);
 742
 743         /* restore savedDCRDR */
 744         res = target_write_u32(target, DCB_DCRDR, target->savedDCRDR);
 745         if (res != ERROR_OK)
 746                 return res;
 747
 748         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 749
 750         res = adapter->layout->api->step(adapter->fd);
 751
 752         if (res != ERROR_OK)
 753                 return res;
 754
 755         /* registers are now invalid */
 756         register_cache_invalidate(armv7m->arm.core_cache);
 757
 758         if (breakpoint)
 759                 cortex_m3_set_breakpoint(target, breakpoint);
 760
 761         adapter_debug_entry(target);
 762         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 763
 764         LOG_INFO("halted: PC: 0x%08x", buf_get_u32(armv7m->arm.pc->value, 0, 32));
 765
 766         return ERROR_OK;
 767 }
 768
 769 static int adapter_read_memory(struct target *target, uint32_t address,
 770                 uint32_t size, uint32_t count,
 771                 uint8_t *buffer)
 772 {
 773         struct hl_interface_s *adapter = target_to_adapter(target);
 774         int res;
 775         uint32_t buffer_threshold = (adapter->param.max_buffer / 4);
 776         uint32_t addr_increment = 4;
 777         uint32_t c;
 778
 779         if (!count || !buffer)
 780                 return ERROR_COMMAND_SYNTAX_ERROR;
 781
 782         LOG_DEBUG("%s 0x%08x %d %d", __func__, address, size, count);
 783
 784         /* prepare byte count, buffer threshold
 785          * and address increment for none 32bit access
 786          */
 787         if (size != 4) {
 788                 count *= size;
 789                 buffer_threshold = (adapter->param.max_buffer / 4) / 2;
 790                 addr_increment = 1;
 791         }
 792
 793         while (count) {
 794                 if (count > buffer_threshold)
 795                         c = buffer_threshold;
 796                 else
 797                         c = count;
 798
 799                 if (size != 4)
 800                         res = adapter->layout->api->read_mem8(adapter->fd,
 801                                         address, c, buffer);
 802                 else
 803                         res = adapter->layout->api->read_mem32(adapter->fd,
 804                                         address, c, buffer);
 805
 806                 if (res != ERROR_OK)
 807                         return res;
 808
 809                 address += (c * addr_increment);
 810                 buffer += (c * addr_increment);
 811                 count -= c;
 812         }
 813
 814         return ERROR_OK;
 815 }
 816
 817 static int adapter_write_memory(struct target *target, uint32_t address,
 818                 uint32_t size, uint32_t count,
 819                 const uint8_t *buffer)
 820 {
 821         struct hl_interface_s *adapter = target_to_adapter(target);
 822         int res;
 823         uint32_t buffer_threshold = (adapter->param.max_buffer / 4);
 824         uint32_t addr_increment = 4;
 825         uint32_t c;
 826
 827         if (!count || !buffer)
 828                 return ERROR_COMMAND_SYNTAX_ERROR;
 829
 830         LOG_DEBUG("%s 0x%08x %d %d", __func__, address, size, count);
 831
 832         /* prepare byte count, buffer threshold
 833          * and address increment for none 32bit access
 834          */
 835         if (size != 4) {
 836                 count *= size;
 837                 buffer_threshold = (adapter->param.max_buffer / 4) / 2;
 838                 addr_increment = 1;
 839         }
 840
 841         while (count) {
 842                 if (count > buffer_threshold)
 843                         c = buffer_threshold;
 844                 else
 845                         c = count;
 846
 847                 if (size != 4)
 848                         res = adapter->layout->api->write_mem8(adapter->fd,
 849                                         address, c, buffer);
 850                 else
 851                         res = adapter->layout->api->write_mem32(adapter->fd,
 852                                         address, c, buffer);
 853
 854                 if (res != ERROR_OK)
 855                         return res;
 856
 857                 address += (c * addr_increment);
 858                 buffer += (c * addr_increment);
 859                 count -= c;
 860         }
 861
 862         return ERROR_OK;
 863 }
 864
 865 static const struct command_registration adapter_command_handlers[] = {
 866         {
 867                 .chain = arm_command_handlers,
 868         },
 869         COMMAND_REGISTRATION_DONE
 870 };
 871
 872 struct target_type hla_target = {
 873         .name = "hla_target",
 874         .deprecated_name = "stm32_stlink",
 875
 876         .init_target = adapter_init_target,
 877         .target_create = adapter_target_create,
 878         .examine = cortex_m3_examine,
 879         .commands = adapter_command_handlers,
 880
 881         .poll = adapter_poll,
 882         .arch_state = armv7m_arch_state,
 883
 884         .target_request_data = hl_target_request_data,
 885         .assert_reset = adapter_assert_reset,
 886         .deassert_reset = adapter_deassert_reset,
 887
 888         .halt = adapter_halt,
 889         .resume = adapter_resume,
 890         .step = adapter_step,
 891
 892         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
 893
 894         .read_memory = adapter_read_memory,
 895         .write_memory = adapter_write_memory,
 896         .checksum_memory = armv7m_checksum_memory,
 897         .blank_check_memory = armv7m_blank_check_memory,
 898
 899         .run_algorithm = armv7m_run_algorithm,
 900         .start_algorithm = armv7m_start_algorithm,
 901         .wait_algorithm = armv7m_wait_algorithm,
 902
 903         .add_breakpoint = cortex_m3_add_breakpoint,
 904         .remove_breakpoint = cortex_m3_remove_breakpoint,
 905         .add_watchpoint = cortex_m3_add_watchpoint,
 906         .remove_watchpoint = cortex_m3_remove_watchpoint,
 907 };