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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, see <http://www.gnu.org/licenses/>. *
  22  ***************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include "jtag/jtag.h"
  29 #include "jtag/hla/hla_transport.h"
  30 #include "jtag/hla/hla_interface.h"
  31 #include "jtag/hla/hla_layout.h"
  32 #include "register.h"
  33 #include "algorithm.h"
  34 #include "target.h"
  35 #include "breakpoints.h"
  36 #include "target_type.h"
  37 #include "armv7m.h"
  38 #include "cortex_m.h"
  39 #include "arm_semihosting.h"
  40 #include "target_request.h"
  41
  42 #define savedDCRDR  dbgbase  /* FIXME: using target->dbgbase to preserve DCRDR */
  43
  44 #define ARMV7M_SCS_DCRSR        DCB_DCRSR
  45 #define ARMV7M_SCS_DCRDR        DCB_DCRDR
  46
  47 static inline struct hl_interface_s *target_to_adapter(struct target *target)
  48 {
  49         return target->tap->priv;
  50 }
  51
  52 static int adapter_load_core_reg_u32(struct target *target,
  53                 uint32_t num, uint32_t *value)
  54 {
  55         int retval;
  56         struct hl_interface_s *adapter = target_to_adapter(target);
  57
  58         LOG_DEBUG("%s", __func__);
  59
  60         /* NOTE:  we "know" here that the register identifiers used
  61          * in the v7m header match the Cortex-M3 Debug Core Register
  62          * Selector values for R0..R15, xPSR, MSP, and PSP.
  63          */
  64         switch (num) {
  65         case 0 ... 18:
  66                 /* read a normal core register */
  67                 retval = adapter->layout->api->read_reg(adapter->handle, num, value);
  68
  69                 if (retval != ERROR_OK) {
  70                         LOG_ERROR("JTAG failure %i", retval);
  71                         return ERROR_JTAG_DEVICE_ERROR;
  72                 }
  73                 LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "", (int)num, *value);
  74                 break;
  75
  76         case ARMV7M_FPSCR:
  77                 /* Floating-point Status and Registers */
  78                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, 33);
  79                 if (retval != ERROR_OK)
  80                         return retval;
  81                 retval = target_read_u32(target, ARMV7M_SCS_DCRDR, value);
  82                 if (retval != ERROR_OK)
  83                         return retval;
  84                 LOG_DEBUG("load from FPSCR  value 0x%" PRIx32, *value);
  85                 break;
  86
  87         case ARMV7M_S0 ... ARMV7M_S31:
  88                 /* Floating-point Status and Registers */
  89                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, num-ARMV7M_S0+64);
  90                 if (retval != ERROR_OK)
  91                         return retval;
  92                 retval = target_read_u32(target, ARMV7M_SCS_DCRDR, value);
  93                 if (retval != ERROR_OK)
  94                         return retval;
  95                 LOG_DEBUG("load from FPU reg S%d  value 0x%" PRIx32,
  96                           (int)(num - ARMV7M_S0), *value);
  97                 break;
  98
  99         case ARMV7M_PRIMASK:
 100         case ARMV7M_BASEPRI:
 101         case ARMV7M_FAULTMASK:
 102         case ARMV7M_CONTROL:
 103                 /* Cortex-M3 packages these four registers as bitfields
 104                  * in one Debug Core register.  So say r0 and r2 docs;
 105                  * it was removed from r1 docs, but still works.
 106                  */
 107                 retval = adapter->layout->api->read_reg(adapter->handle, 20, value);
 108                 if (retval != ERROR_OK)
 109                         return retval;
 110
 111                 switch (num) {
 112                 case ARMV7M_PRIMASK:
 113                         *value = buf_get_u32((uint8_t *) value, 0, 1);
 114                         break;
 115
 116                 case ARMV7M_BASEPRI:
 117                         *value = buf_get_u32((uint8_t *) value, 8, 8);
 118                         break;
 119
 120                 case ARMV7M_FAULTMASK:
 121                         *value = buf_get_u32((uint8_t *) value, 16, 1);
 122                         break;
 123
 124                 case ARMV7M_CONTROL:
 125                         *value = buf_get_u32((uint8_t *) value, 24, 2);
 126                         break;
 127                 }
 128
 129                 LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "",
 130                           (int)num, *value);
 131                 break;
 132
 133         default:
 134                 return ERROR_COMMAND_SYNTAX_ERROR;
 135         }
 136
 137         return ERROR_OK;
 138 }
 139
 140 static int adapter_store_core_reg_u32(struct target *target,
 141                 uint32_t num, uint32_t value)
 142 {
 143         int retval;
 144         uint32_t reg;
 145         struct armv7m_common *armv7m = target_to_armv7m(target);
 146         struct hl_interface_s *adapter = target_to_adapter(target);
 147
 148         LOG_DEBUG("%s", __func__);
 149
 150         /* NOTE:  we "know" here that the register identifiers used
 151          * in the v7m header match the Cortex-M3 Debug Core Register
 152          * Selector values for R0..R15, xPSR, MSP, and PSP.
 153          */
 154         switch (num) {
 155         case 0 ... 18:
 156                 retval = adapter->layout->api->write_reg(adapter->handle, num, value);
 157
 158                 if (retval != ERROR_OK) {
 159                         struct reg *r;
 160
 161                         LOG_ERROR("JTAG failure");
 162                         r = armv7m->arm.core_cache->reg_list + num;
 163                         r->dirty = r->valid;
 164                         return ERROR_JTAG_DEVICE_ERROR;
 165                 }
 166                 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
 167                 break;
 168
 169         case ARMV7M_FPSCR:
 170                 /* Floating-point Status and Registers */
 171                 retval = target_write_u32(target, ARMV7M_SCS_DCRDR, value);
 172                 if (retval != ERROR_OK)
 173                         return retval;
 174                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, 33 | (1<<16));
 175                 if (retval != ERROR_OK)
 176                         return retval;
 177                 LOG_DEBUG("write FPSCR value 0x%" PRIx32, value);
 178                 break;
 179
 180         case ARMV7M_S0 ... ARMV7M_S31:
 181                 /* Floating-point Status and Registers */
 182                 retval = target_write_u32(target, ARMV7M_SCS_DCRDR, value);
 183                 if (retval != ERROR_OK)
 184                         return retval;
 185                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, (num-ARMV7M_S0+64) | (1<<16));
 186                 if (retval != ERROR_OK)
 187                         return retval;
 188                 LOG_DEBUG("write FPU reg S%d  value 0x%" PRIx32,
 189                           (int)(num - ARMV7M_S0), value);
 190                 break;
 191
 192         case ARMV7M_PRIMASK:
 193         case ARMV7M_BASEPRI:
 194         case ARMV7M_FAULTMASK:
 195         case ARMV7M_CONTROL:
 196                 /* Cortex-M3 packages these four registers as bitfields
 197                  * in one Debug Core register.  So say r0 and r2 docs;
 198                  * it was removed from r1 docs, but still works.
 199                  */
 200
 201                 adapter->layout->api->read_reg(adapter->handle, 20, &reg);
 202
 203                 switch (num) {
 204                 case ARMV7M_PRIMASK:
 205                         buf_set_u32((uint8_t *) &reg, 0, 1, value);
 206                         break;
 207
 208                 case ARMV7M_BASEPRI:
 209                         buf_set_u32((uint8_t *) &reg, 8, 8, value);
 210                         break;
 211
 212                 case ARMV7M_FAULTMASK:
 213                         buf_set_u32((uint8_t *) &reg, 16, 1, value);
 214                         break;
 215
 216                 case ARMV7M_CONTROL:
 217                         buf_set_u32((uint8_t *) &reg, 24, 2, value);
 218                         break;
 219                 }
 220
 221                 adapter->layout->api->write_reg(adapter->handle, 20, reg);
 222
 223                 LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value);
 224                 break;
 225
 226         default:
 227                 return ERROR_COMMAND_SYNTAX_ERROR;
 228         }
 229
 230         return ERROR_OK;
 231 }
 232
 233 static int adapter_examine_debug_reason(struct target *target)
 234 {
 235         if ((target->debug_reason != DBG_REASON_DBGRQ)
 236                         && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
 237                 target->debug_reason = DBG_REASON_BREAKPOINT;
 238         }
 239
 240         return ERROR_OK;
 241 }
 242
 243 static int hl_dcc_read(struct hl_interface_s *hl_if, uint8_t *value, uint8_t *ctrl)
 244 {
 245         uint16_t dcrdr;
 246         int retval = hl_if->layout->api->read_mem(hl_if->handle,
 247                         DCB_DCRDR, 1, sizeof(dcrdr), (uint8_t *)&dcrdr);
 248         if (retval == ERROR_OK) {
 249             *ctrl = (uint8_t)dcrdr;
 250             *value = (uint8_t)(dcrdr >> 8);
 251
 252             LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
 253
 254             if (dcrdr & 1) {
 255                         /* write ack back to software dcc register
 256                          * to signify we have read data */
 257                         /* atomically clear just the byte containing the busy bit */
 258                         static const uint8_t zero;
 259                         retval = hl_if->layout->api->write_mem(hl_if->handle, DCB_DCRDR, 1, 1, &zero);
 260                 }
 261         }
 262         return retval;
 263 }
 264
 265 static int hl_target_request_data(struct target *target,
 266         uint32_t size, uint8_t *buffer)
 267 {
 268         struct hl_interface_s *hl_if = target_to_adapter(target);
 269         uint8_t data;
 270         uint8_t ctrl;
 271         uint32_t i;
 272
 273         for (i = 0; i < (size * 4); i++) {
 274                 int err = hl_dcc_read(hl_if, &data, &ctrl);
 275                 if (err != ERROR_OK)
 276                         return err;
 277
 278                 buffer[i] = data;
 279         }
 280
 281         return ERROR_OK;
 282 }
 283
 284 static int hl_handle_target_request(void *priv)
 285 {
 286         struct target *target = priv;
 287         int err;
 288
 289         if (!target_was_examined(target))
 290                 return ERROR_OK;
 291         struct hl_interface_s *hl_if = target_to_adapter(target);
 292
 293         if (!target->dbg_msg_enabled)
 294                 return ERROR_OK;
 295
 296         if (target->state == TARGET_RUNNING) {
 297                 uint8_t data;
 298                 uint8_t ctrl;
 299
 300                 err = hl_dcc_read(hl_if, &data, &ctrl);
 301                 if (err != ERROR_OK)
 302                         return err;
 303
 304                 /* check if we have data */
 305                 if (ctrl & (1 << 0)) {
 306                         uint32_t request;
 307
 308                         /* we assume target is quick enough */
 309                         request = data;
 310                         err = hl_dcc_read(hl_if, &data, &ctrl);
 311                         if (err != ERROR_OK)
 312                                 return err;
 313
 314                         request |= (data << 8);
 315                         err = hl_dcc_read(hl_if, &data, &ctrl);
 316                         if (err != ERROR_OK)
 317                                 return err;
 318
 319                         request |= (data << 16);
 320                         err = hl_dcc_read(hl_if, &data, &ctrl);
 321                         if (err != ERROR_OK)
 322                                 return err;
 323
 324                         request |= (data << 24);
 325                         target_request(target, request);
 326                 }
 327         }
 328
 329         return ERROR_OK;
 330 }
 331
 332 static int adapter_init_arch_info(struct target *target,
 333                                        struct cortex_m_common *cortex_m,
 334                                        struct jtag_tap *tap)
 335 {
 336         struct armv7m_common *armv7m;
 337
 338         LOG_DEBUG("%s", __func__);
 339
 340         armv7m = &cortex_m->armv7m;
 341         armv7m_init_arch_info(target, armv7m);
 342
 343         armv7m->load_core_reg_u32 = adapter_load_core_reg_u32;
 344         armv7m->store_core_reg_u32 = adapter_store_core_reg_u32;
 345
 346         armv7m->examine_debug_reason = adapter_examine_debug_reason;
 347         armv7m->stlink = true;
 348
 349         target_register_timer_callback(hl_handle_target_request, 1, 1, target);
 350
 351         return ERROR_OK;
 352 }
 353
 354 static int adapter_init_target(struct command_context *cmd_ctx,
 355                                     struct target *target)
 356 {
 357         LOG_DEBUG("%s", __func__);
 358
 359         armv7m_build_reg_cache(target);
 360         arm_semihosting_init(target);
 361         return ERROR_OK;
 362 }
 363
 364 static int adapter_target_create(struct target *target,
 365                 Jim_Interp *interp)
 366 {
 367         LOG_DEBUG("%s", __func__);
 368
 369         struct cortex_m_common *cortex_m = calloc(1, sizeof(struct cortex_m_common));
 370
 371         if (!cortex_m)
 372                 return ERROR_COMMAND_SYNTAX_ERROR;
 373
 374         adapter_init_arch_info(target, cortex_m, target->tap);
 375
 376         return ERROR_OK;
 377 }
 378
 379 static int adapter_load_context(struct target *target)
 380 {
 381         struct armv7m_common *armv7m = target_to_armv7m(target);
 382         int num_regs = armv7m->arm.core_cache->num_regs;
 383
 384         for (int i = 0; i < num_regs; i++) {
 385
 386                 struct reg *r = &armv7m->arm.core_cache->reg_list[i];
 387                 if (!r->valid)
 388                         armv7m->arm.read_core_reg(target, r, i, ARM_MODE_ANY);
 389         }
 390
 391         return ERROR_OK;
 392 }
 393
 394 static int adapter_debug_entry(struct target *target)
 395 {
 396         struct hl_interface_s *adapter = target_to_adapter(target);
 397         struct armv7m_common *armv7m = target_to_armv7m(target);
 398         struct arm *arm = &armv7m->arm;
 399         struct reg *r;
 400         uint32_t xPSR;
 401         int retval;
 402
 403         /* preserve the DCRDR across halts */
 404         retval = target_read_u32(target, DCB_DCRDR, &target->savedDCRDR);
 405         if (retval != ERROR_OK)
 406                 return retval;
 407
 408         retval = armv7m->examine_debug_reason(target);
 409         if (retval != ERROR_OK)
 410                 return retval;
 411
 412         adapter_load_context(target);
 413
 414         /* make sure we clear the vector catch bit */
 415         adapter->layout->api->write_debug_reg(adapter->handle, DCB_DEMCR, TRCENA);
 416
 417         r = arm->cpsr;
 418         xPSR = buf_get_u32(r->value, 0, 32);
 419
 420         /* Are we in an exception handler */
 421         if (xPSR & 0x1FF) {
 422                 armv7m->exception_number = (xPSR & 0x1FF);
 423
 424                 arm->core_mode = ARM_MODE_HANDLER;
 425                 arm->map = armv7m_msp_reg_map;
 426         } else {
 427                 unsigned control = buf_get_u32(arm->core_cache
 428                                 ->reg_list[ARMV7M_CONTROL].value, 0, 2);
 429
 430                 /* is this thread privileged? */
 431                 arm->core_mode = control & 1
 432                                 ? ARM_MODE_USER_THREAD
 433                                 : ARM_MODE_THREAD;
 434
 435                 /* which stack is it using? */
 436                 if (control & 2)
 437                         arm->map = armv7m_psp_reg_map;
 438                 else
 439                         arm->map = armv7m_msp_reg_map;
 440
 441                 armv7m->exception_number = 0;
 442         }
 443
 444         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%08" PRIx32 ", target->state: %s",
 445                 arm_mode_name(arm->core_mode),
 446                 buf_get_u32(arm->pc->value, 0, 32),
 447                 target_state_name(target));
 448
 449         return retval;
 450 }
 451
 452 static int adapter_poll(struct target *target)
 453 {
 454         enum target_state state;
 455         struct hl_interface_s *adapter = target_to_adapter(target);
 456         struct armv7m_common *armv7m = target_to_armv7m(target);
 457         enum target_state prev_target_state = target->state;
 458
 459         state = adapter->layout->api->state(adapter->handle);
 460
 461         if (state == TARGET_UNKNOWN) {
 462                 LOG_ERROR("jtag status contains invalid mode value - communication failure");
 463                 return ERROR_TARGET_FAILURE;
 464         }
 465
 466         if (prev_target_state == state)
 467                 return ERROR_OK;
 468
 469         target->state = state;
 470
 471         if (state == TARGET_HALTED) {
 472
 473                 int retval = adapter_debug_entry(target);
 474                 if (retval != ERROR_OK)
 475                         return retval;
 476
 477                 if (prev_target_state == TARGET_DEBUG_RUNNING) {
 478                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 479                 } else {
 480                         if (arm_semihosting(target, &retval) != 0)
 481                                 return retval;
 482
 483                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 484                 }
 485
 486                 LOG_DEBUG("halted: PC: 0x%08" PRIx32, buf_get_u32(armv7m->arm.pc->value, 0, 32));
 487         }
 488
 489         return ERROR_OK;
 490 }
 491
 492 static int adapter_assert_reset(struct target *target)
 493 {
 494         int res = ERROR_OK;
 495         struct hl_interface_s *adapter = target_to_adapter(target);
 496         struct armv7m_common *armv7m = target_to_armv7m(target);
 497         bool use_srst_fallback = true;
 498
 499         LOG_DEBUG("%s", __func__);
 500
 501         enum reset_types jtag_reset_config = jtag_get_reset_config();
 502
 503         bool srst_asserted = false;
 504
 505         if ((jtag_reset_config & RESET_HAS_SRST) &&
 506             (jtag_reset_config & RESET_SRST_NO_GATING)) {
 507                 jtag_add_reset(0, 1);
 508                 res = adapter->layout->api->assert_srst(adapter->handle, 0);
 509                 srst_asserted = true;
 510         }
 511
 512         adapter->layout->api->write_debug_reg(adapter->handle, DCB_DHCSR, DBGKEY|C_DEBUGEN);
 513
 514         /* only set vector catch if halt is requested */
 515         if (target->reset_halt)
 516                 adapter->layout->api->write_debug_reg(adapter->handle, DCB_DEMCR, TRCENA|VC_CORERESET);
 517         else
 518                 adapter->layout->api->write_debug_reg(adapter->handle, DCB_DEMCR, TRCENA);
 519
 520         if (jtag_reset_config & RESET_HAS_SRST) {
 521                 if (!srst_asserted) {
 522                         jtag_add_reset(0, 1);
 523                         res = adapter->layout->api->assert_srst(adapter->handle, 0);
 524                 }
 525                 if (res == ERROR_COMMAND_NOTFOUND)
 526                         LOG_ERROR("Hardware srst not supported, falling back to software reset");
 527                 else if (res == ERROR_OK) {
 528                         /* hardware srst supported */
 529                         use_srst_fallback = false;
 530                 }
 531         }
 532
 533         if (use_srst_fallback) {
 534                 /* stlink v1 api does not support hardware srst, so we use a software reset fallback */
 535                 adapter->layout->api->write_debug_reg(adapter->handle, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ);
 536         }
 537
 538         res = adapter->layout->api->reset(adapter->handle);
 539
 540         if (res != ERROR_OK)
 541                 return res;
 542
 543         /* registers are now invalid */
 544         register_cache_invalidate(armv7m->arm.core_cache);
 545
 546         if (target->reset_halt) {
 547                 target->state = TARGET_RESET;
 548                 target->debug_reason = DBG_REASON_DBGRQ;
 549         } else {
 550                 target->state = TARGET_HALTED;
 551         }
 552
 553         return ERROR_OK;
 554 }
 555
 556 static int adapter_deassert_reset(struct target *target)
 557 {
 558         struct hl_interface_s *adapter = target_to_adapter(target);
 559
 560         enum reset_types jtag_reset_config = jtag_get_reset_config();
 561
 562         LOG_DEBUG("%s", __func__);
 563
 564         if (jtag_reset_config & RESET_HAS_SRST)
 565                 adapter->layout->api->assert_srst(adapter->handle, 1);
 566
 567         /* virtual deassert reset, we need it for the internal
 568          * jtag state machine
 569          */
 570         jtag_add_reset(0, 0);
 571
 572         target->savedDCRDR = 0;  /* clear both DCC busy bits on initial resume */
 573
 574         return target->reset_halt ? ERROR_OK : target_resume(target, 1, 0, 0, 0);
 575 }
 576
 577 static int adapter_halt(struct target *target)
 578 {
 579         int res;
 580         struct hl_interface_s *adapter = target_to_adapter(target);
 581
 582         LOG_DEBUG("%s", __func__);
 583
 584         if (target->state == TARGET_HALTED) {
 585                 LOG_DEBUG("target was already halted");
 586                 return ERROR_OK;
 587         }
 588
 589         if (target->state == TARGET_UNKNOWN)
 590                 LOG_WARNING("target was in unknown state when halt was requested");
 591
 592         res = adapter->layout->api->halt(adapter->handle);
 593
 594         if (res != ERROR_OK)
 595                 return res;
 596
 597         target->debug_reason = DBG_REASON_DBGRQ;
 598
 599         return ERROR_OK;
 600 }
 601
 602 static int adapter_resume(struct target *target, int current,
 603                 target_addr_t address, int handle_breakpoints,
 604                 int debug_execution)
 605 {
 606         int res;
 607         struct hl_interface_s *adapter = target_to_adapter(target);
 608         struct armv7m_common *armv7m = target_to_armv7m(target);
 609         uint32_t resume_pc;
 610         struct breakpoint *breakpoint = NULL;
 611         struct reg *pc;
 612
 613         LOG_DEBUG("%s %d " TARGET_ADDR_FMT " %d %d", __func__, current,
 614                         address, handle_breakpoints, debug_execution);
 615
 616         if (target->state != TARGET_HALTED) {
 617                 LOG_WARNING("target not halted");
 618                 return ERROR_TARGET_NOT_HALTED;
 619         }
 620
 621         if (!debug_execution) {
 622                 target_free_all_working_areas(target);
 623                 cortex_m_enable_breakpoints(target);
 624                 cortex_m_enable_watchpoints(target);
 625         }
 626
 627         pc = armv7m->arm.pc;
 628         if (!current) {
 629                 buf_set_u32(pc->value, 0, 32, address);
 630                 pc->dirty = true;
 631                 pc->valid = true;
 632         }
 633
 634         if (!breakpoint_find(target, buf_get_u32(pc->value, 0, 32))
 635                         && !debug_execution) {
 636                 armv7m_maybe_skip_bkpt_inst(target, NULL);
 637         }
 638
 639         resume_pc = buf_get_u32(pc->value, 0, 32);
 640
 641         /* write any user vector flags */
 642         res = target_write_u32(target, DCB_DEMCR, TRCENA | armv7m->demcr);
 643         if (res != ERROR_OK)
 644                 return res;
 645
 646         armv7m_restore_context(target);
 647
 648         /* restore savedDCRDR */
 649         res = target_write_u32(target, DCB_DCRDR, target->savedDCRDR);
 650         if (res != ERROR_OK)
 651                 return res;
 652
 653         /* registers are now invalid */
 654         register_cache_invalidate(armv7m->arm.core_cache);
 655
 656         /* the front-end may request us not to handle breakpoints */
 657         if (handle_breakpoints) {
 658                 /* Single step past breakpoint at current address */
 659                 breakpoint = breakpoint_find(target, resume_pc);
 660                 if (breakpoint) {
 661                         LOG_DEBUG("unset breakpoint at " TARGET_ADDR_FMT " (ID: %" PRIu32 ")",
 662                                         breakpoint->address,
 663                                         breakpoint->unique_id);
 664                         cortex_m_unset_breakpoint(target, breakpoint);
 665
 666                         res = adapter->layout->api->step(adapter->handle);
 667
 668                         if (res != ERROR_OK)
 669                                 return res;
 670
 671                         cortex_m_set_breakpoint(target, breakpoint);
 672                 }
 673         }
 674
 675         res = adapter->layout->api->run(adapter->handle);
 676
 677         if (res != ERROR_OK)
 678                 return res;
 679
 680         target->debug_reason = DBG_REASON_NOTHALTED;
 681
 682         if (!debug_execution) {
 683                 target->state = TARGET_RUNNING;
 684                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 685         } else {
 686                 target->state = TARGET_DEBUG_RUNNING;
 687                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 688         }
 689
 690         return ERROR_OK;
 691 }
 692
 693 static int adapter_step(struct target *target, int current,
 694                 target_addr_t address, int handle_breakpoints)
 695 {
 696         int res;
 697         struct hl_interface_s *adapter = target_to_adapter(target);
 698         struct armv7m_common *armv7m = target_to_armv7m(target);
 699         struct breakpoint *breakpoint = NULL;
 700         struct reg *pc = armv7m->arm.pc;
 701         bool bkpt_inst_found = false;
 702
 703         LOG_DEBUG("%s", __func__);
 704
 705         if (target->state != TARGET_HALTED) {
 706                 LOG_WARNING("target not halted");
 707                 return ERROR_TARGET_NOT_HALTED;
 708         }
 709
 710         if (!current) {
 711                 buf_set_u32(pc->value, 0, 32, address);
 712                 pc->dirty = true;
 713                 pc->valid = true;
 714         }
 715
 716         uint32_t pc_value = buf_get_u32(pc->value, 0, 32);
 717
 718         /* the front-end may request us not to handle breakpoints */
 719         if (handle_breakpoints) {
 720                 breakpoint = breakpoint_find(target, pc_value);
 721                 if (breakpoint)
 722                         cortex_m_unset_breakpoint(target, breakpoint);
 723         }
 724
 725         armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found);
 726
 727         target->debug_reason = DBG_REASON_SINGLESTEP;
 728
 729         armv7m_restore_context(target);
 730
 731         /* restore savedDCRDR */
 732         res = target_write_u32(target, DCB_DCRDR, target->savedDCRDR);
 733         if (res != ERROR_OK)
 734                 return res;
 735
 736         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 737
 738         res = adapter->layout->api->step(adapter->handle);
 739
 740         if (res != ERROR_OK)
 741                 return res;
 742
 743         /* registers are now invalid */
 744         register_cache_invalidate(armv7m->arm.core_cache);
 745
 746         if (breakpoint)
 747                 cortex_m_set_breakpoint(target, breakpoint);
 748
 749         adapter_debug_entry(target);
 750         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 751
 752         LOG_INFO("halted: PC: 0x%08" PRIx32, buf_get_u32(armv7m->arm.pc->value, 0, 32));
 753
 754         return ERROR_OK;
 755 }
 756
 757 static int adapter_read_memory(struct target *target, target_addr_t address,
 758                 uint32_t size, uint32_t count,
 759                 uint8_t *buffer)
 760 {
 761         struct hl_interface_s *adapter = target_to_adapter(target);
 762
 763         if (!count || !buffer)
 764                 return ERROR_COMMAND_SYNTAX_ERROR;
 765
 766         LOG_DEBUG("%s " TARGET_ADDR_FMT " %" PRIu32 " %" PRIu32,
 767                           __func__, address, size, count);
 768
 769         return adapter->layout->api->read_mem(adapter->handle, address, size, count, buffer);
 770 }
 771
 772 static int adapter_write_memory(struct target *target, target_addr_t address,
 773                 uint32_t size, uint32_t count,
 774                 const uint8_t *buffer)
 775 {
 776         struct hl_interface_s *adapter = target_to_adapter(target);
 777
 778         if (!count || !buffer)
 779                 return ERROR_COMMAND_SYNTAX_ERROR;
 780
 781         LOG_DEBUG("%s " TARGET_ADDR_FMT " %" PRIu32 " %" PRIu32,
 782                           __func__, address, size, count);
 783
 784         return adapter->layout->api->write_mem(adapter->handle, address, size, count, buffer);
 785 }
 786
 787 static const struct command_registration adapter_command_handlers[] = {
 788         {
 789                 .chain = arm_command_handlers,
 790         },
 791         {
 792                 .chain = armv7m_trace_command_handlers,
 793         },
 794         COMMAND_REGISTRATION_DONE
 795 };
 796
 797 struct target_type hla_target = {
 798         .name = "hla_target",
 799         .deprecated_name = "stm32_stlink",
 800
 801         .init_target = adapter_init_target,
 802         .deinit_target = cortex_m_deinit_target,
 803         .target_create = adapter_target_create,
 804         .examine = cortex_m_examine,
 805         .commands = adapter_command_handlers,
 806
 807         .poll = adapter_poll,
 808         .arch_state = armv7m_arch_state,
 809
 810         .target_request_data = hl_target_request_data,
 811         .assert_reset = adapter_assert_reset,
 812         .deassert_reset = adapter_deassert_reset,
 813
 814         .halt = adapter_halt,
 815         .resume = adapter_resume,
 816         .step = adapter_step,
 817
 818         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
 819
 820         .read_memory = adapter_read_memory,
 821         .write_memory = adapter_write_memory,
 822         .checksum_memory = armv7m_checksum_memory,
 823         .blank_check_memory = armv7m_blank_check_memory,
 824
 825         .run_algorithm = armv7m_run_algorithm,
 826         .start_algorithm = armv7m_start_algorithm,
 827         .wait_algorithm = armv7m_wait_algorithm,
 828
 829         .add_breakpoint = cortex_m_add_breakpoint,
 830         .remove_breakpoint = cortex_m_remove_breakpoint,
 831         .add_watchpoint = cortex_m_add_watchpoint,
 832         .remove_watchpoint = cortex_m_remove_watchpoint,
 833         .profiling = cortex_m_profiling,
 834 };