git.gag.com Git - fw/openocd/blob - src/target/stm32_stlink.c

   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  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include "jtag/jtag.h"
  29 #include "jtag/stlink/stlink_transport.h"
  30 #include "jtag/stlink/stlink_interface.h"
  31 #include "jtag/stlink/stlink_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
  41 #define ARMV7M_SCS_DCRSR        0xe000edf4
  42 #define ARMV7M_SCS_DCRDR        0xe000edf8
  43
  44 static inline struct stlink_interface_s *target_to_stlink(struct target *target)
  45 {
  46         return target->tap->priv;
  47 }
  48
  49 static int stm32_stlink_load_core_reg_u32(struct target *target,
  50                 enum armv7m_regtype type,
  51                 uint32_t num, uint32_t *value)
  52 {
  53         int retval;
  54         struct stlink_interface_s *stlink_if = target_to_stlink(target);
  55
  56         LOG_DEBUG("%s", __func__);
  57
  58         /* NOTE:  we "know" here that the register identifiers used
  59          * in the v7m header match the Cortex-M3 Debug Core Register
  60          * Selector values for R0..R15, xPSR, MSP, and PSP.
  61          */
  62         switch (num) {
  63         case 0 ... 18:
  64                 /* read a normal core register */
  65                 retval = stlink_if->layout->api->read_reg(stlink_if->fd, num, value);
  66
  67                 if (retval != ERROR_OK) {
  68                         LOG_ERROR("JTAG failure %i", retval);
  69                         return ERROR_JTAG_DEVICE_ERROR;
  70                 }
  71                 LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "", (int)num, *value);
  72                 break;
  73
  74         case ARMV7M_FPSID:
  75         case ARMV7M_FPEXC:
  76                 *value = 0;
  77                 break;
  78
  79         case ARMV7M_FPSCR:
  80                 /* Floating-point Status and Registers */
  81                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, 33);
  82                 if (retval != ERROR_OK)
  83                         return retval;
  84                 retval = target_read_u32(target, ARMV7M_SCS_DCRDR, value);
  85                 if (retval != ERROR_OK)
  86                         return retval;
  87                 LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "", (int)num, *value);
  88                 break;
  89
  90         case ARMV7M_S0 ... ARMV7M_S31:
  91                 /* Floating-point Status and Registers */
  92                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, num-ARMV7M_S0+64);
  93                 if (retval != ERROR_OK)
  94                         return retval;
  95                 retval = target_read_u32(target, ARMV7M_SCS_DCRDR, value);
  96                 if (retval != ERROR_OK)
  97                         return retval;
  98                 LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "", (int)num, *value);
  99                 break;
 100
 101         case ARMV7M_D0 ... ARMV7M_D15:
 102                 value = 0;
 103                 break;
 104
 105         case ARMV7M_PRIMASK:
 106         case ARMV7M_BASEPRI:
 107         case ARMV7M_FAULTMASK:
 108         case ARMV7M_CONTROL:
 109                 /* Cortex-M3 packages these four registers as bitfields
 110                  * in one Debug Core register.  So say r0 and r2 docs;
 111                  * it was removed from r1 docs, but still works.
 112                  */
 113                 retval = stlink_if->layout->api->read_reg(stlink_if->fd, 20, value);
 114                 if (retval != ERROR_OK)
 115                         return retval;
 116
 117                 switch (num) {
 118                 case ARMV7M_PRIMASK:
 119                         *value = buf_get_u32((uint8_t *) value, 0, 1);
 120                         break;
 121
 122                 case ARMV7M_BASEPRI:
 123                         *value = buf_get_u32((uint8_t *) value, 8, 8);
 124                         break;
 125
 126                 case ARMV7M_FAULTMASK:
 127                         *value = buf_get_u32((uint8_t *) value, 16, 1);
 128                         break;
 129
 130                 case ARMV7M_CONTROL:
 131                         *value = buf_get_u32((uint8_t *) value, 24, 2);
 132                         break;
 133                 }
 134
 135                 LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "",
 136                           (int)num, *value);
 137                 break;
 138
 139         default:
 140                 return ERROR_COMMAND_SYNTAX_ERROR;
 141         }
 142
 143         return ERROR_OK;
 144 }
 145
 146 static int stm32_stlink_store_core_reg_u32(struct target *target,
 147                 enum armv7m_regtype type,
 148                 uint32_t num, uint32_t value)
 149 {
 150         int retval;
 151         uint32_t reg;
 152         struct armv7m_common *armv7m = target_to_armv7m(target);
 153         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 154
 155         LOG_DEBUG("%s", __func__);
 156
 157 #ifdef ARMV7_GDB_HACKS
 158         /* If the LR register is being modified, make sure it will put us
 159          * in "thumb" mode, or an INVSTATE exception will occur. This is a
 160          * hack to deal with the fact that gdb will sometimes "forge"
 161          * return addresses, and doesn't set the LSB correctly (i.e., when
 162          * printing expressions containing function calls, it sets LR = 0.)
 163          * Valid exception return codes have bit 0 set too.
 164          */
 165         if (num == ARMV7M_R14)
 166                 value |= 0x01;
 167 #endif
 168
 169         /* NOTE:  we "know" here that the register identifiers used
 170          * in the v7m header match the Cortex-M3 Debug Core Register
 171          * Selector values for R0..R15, xPSR, MSP, and PSP.
 172          */
 173         switch (num) {
 174         case 0 ... 18:
 175                 retval = stlink_if->layout->api->write_reg(stlink_if->fd, num, value);
 176
 177                 if (retval != ERROR_OK) {
 178                         struct reg *r;
 179
 180                         LOG_ERROR("JTAG failure");
 181                         r = armv7m->core_cache->reg_list + num;
 182                         r->dirty = r->valid;
 183                         return ERROR_JTAG_DEVICE_ERROR;
 184                 }
 185                 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
 186                 break;
 187
 188         case ARMV7M_FPSID:
 189         case ARMV7M_FPEXC:
 190                 break;
 191
 192         case ARMV7M_FPSCR:
 193                 /* Floating-point Status and Registers */
 194                 retval = target_write_u32(target, ARMV7M_SCS_DCRDR, value);
 195                 if (retval != ERROR_OK)
 196                         return retval;
 197                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, 33 | (1<<16));
 198                 if (retval != ERROR_OK)
 199                         return retval;
 200                 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
 201                 break;
 202
 203         case ARMV7M_S0 ... ARMV7M_S31:
 204                 /* Floating-point Status and Registers */
 205                 retval = target_write_u32(target, ARMV7M_SCS_DCRDR, value);
 206                 if (retval != ERROR_OK)
 207                         return retval;
 208                 retval = target_write_u32(target, ARMV7M_SCS_DCRSR, (num-ARMV7M_S0+64) | (1<<16));
 209                 if (retval != ERROR_OK)
 210                         return retval;
 211                 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
 212                 break;
 213
 214         case ARMV7M_D0 ... ARMV7M_D15:
 215                 break;
 216
 217         case ARMV7M_PRIMASK:
 218         case ARMV7M_BASEPRI:
 219         case ARMV7M_FAULTMASK:
 220         case ARMV7M_CONTROL:
 221                 /* Cortex-M3 packages these four registers as bitfields
 222                  * in one Debug Core register.  So say r0 and r2 docs;
 223                  * it was removed from r1 docs, but still works.
 224                  */
 225
 226                 stlink_if->layout->api->read_reg(stlink_if->fd, 20, &reg);
 227
 228                 switch (num) {
 229                 case ARMV7M_PRIMASK:
 230                         buf_set_u32((uint8_t *) &reg, 0, 1, value);
 231                         break;
 232
 233                 case ARMV7M_BASEPRI:
 234                         buf_set_u32((uint8_t *) &reg, 8, 8, value);
 235                         break;
 236
 237                 case ARMV7M_FAULTMASK:
 238                         buf_set_u32((uint8_t *) &reg, 16, 1, value);
 239                         break;
 240
 241                 case ARMV7M_CONTROL:
 242                         buf_set_u32((uint8_t *) &reg, 24, 2, value);
 243                         break;
 244                 }
 245
 246                 stlink_if->layout->api->write_reg(stlink_if->fd, 20, reg);
 247
 248                 LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value);
 249                 break;
 250
 251         default:
 252                 return ERROR_COMMAND_SYNTAX_ERROR;
 253         }
 254
 255         return ERROR_OK;
 256 }
 257
 258 static int stm32_stlink_examine_debug_reason(struct target *target)
 259 {
 260         if ((target->debug_reason != DBG_REASON_DBGRQ)
 261                         && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
 262                 target->debug_reason = DBG_REASON_BREAKPOINT;
 263         }
 264
 265         return ERROR_OK;
 266 }
 267
 268 static int stm32_stlink_init_arch_info(struct target *target,
 269                                        struct cortex_m3_common *cortex_m3,
 270                                        struct jtag_tap *tap)
 271 {
 272         struct armv7m_common *armv7m;
 273
 274         LOG_DEBUG("%s", __func__);
 275
 276         armv7m = &cortex_m3->armv7m;
 277         armv7m_init_arch_info(target, armv7m);
 278
 279         armv7m->load_core_reg_u32 = stm32_stlink_load_core_reg_u32;
 280         armv7m->store_core_reg_u32 = stm32_stlink_store_core_reg_u32;
 281
 282         armv7m->examine_debug_reason = stm32_stlink_examine_debug_reason;
 283         armv7m->stlink = true;
 284
 285         return ERROR_OK;
 286 }
 287
 288 static int stm32_stlink_init_target(struct command_context *cmd_ctx,
 289                                     struct target *target)
 290 {
 291         LOG_DEBUG("%s", __func__);
 292
 293         armv7m_build_reg_cache(target);
 294
 295         return ERROR_OK;
 296 }
 297
 298 static int stm32_stlink_target_create(struct target *target,
 299                 Jim_Interp *interp)
 300 {
 301         LOG_DEBUG("%s", __func__);
 302
 303         struct cortex_m3_common *cortex_m3 = calloc(1, sizeof(struct cortex_m3_common));
 304
 305         if (!cortex_m3)
 306                 return ERROR_COMMAND_SYNTAX_ERROR;
 307
 308         stm32_stlink_init_arch_info(target, cortex_m3, target->tap);
 309
 310         return ERROR_OK;
 311 }
 312
 313 static int stm32_stlink_load_context(struct target *target)
 314 {
 315         struct armv7m_common *armv7m = target_to_armv7m(target);
 316         int num_regs = armv7m->core_cache->num_regs;
 317
 318         for (int i = 0; i < num_regs; i++) {
 319                 if (!armv7m->core_cache->reg_list[i].valid)
 320                         armv7m->read_core_reg(target, i);
 321         }
 322
 323         return ERROR_OK;
 324 }
 325
 326 static int stlink_debug_entry(struct target *target)
 327 {
 328         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 329         struct armv7m_common *armv7m = target_to_armv7m(target);
 330         struct arm *arm = &armv7m->arm;
 331         struct reg *r;
 332         uint32_t xPSR;
 333         int retval;
 334
 335         retval = armv7m->examine_debug_reason(target);
 336         if (retval != ERROR_OK)
 337                 return retval;
 338
 339         stm32_stlink_load_context(target);
 340
 341         /* make sure we clear the vector catch bit */
 342         stlink_if->layout->api->write_debug_reg(stlink_if->fd, DCB_DEMCR, 0);
 343
 344         r = armv7m->core_cache->reg_list + ARMV7M_xPSR;
 345         xPSR = buf_get_u32(r->value, 0, 32);
 346
 347         /* Are we in an exception handler */
 348         if (xPSR & 0x1FF) {
 349                 armv7m->core_mode = ARMV7M_MODE_HANDLER;
 350                 armv7m->exception_number = (xPSR & 0x1FF);
 351
 352                 arm->core_mode = ARM_MODE_HANDLER;
 353                 arm->map = armv7m_msp_reg_map;
 354         } else {
 355                 unsigned control = buf_get_u32(armv7m->core_cache
 356                                 ->reg_list[ARMV7M_CONTROL].value, 0, 2);
 357
 358                 /* is this thread privileged? */
 359                 armv7m->core_mode = control & 1;
 360                 arm->core_mode = armv7m->core_mode
 361                                 ? ARM_MODE_USER_THREAD
 362                                 : ARM_MODE_THREAD;
 363
 364                 /* which stack is it using? */
 365                 if (control & 2)
 366                         arm->map = armv7m_psp_reg_map;
 367                 else
 368                         arm->map = armv7m_msp_reg_map;
 369
 370                 armv7m->exception_number = 0;
 371         }
 372
 373         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%08" PRIx32 ", target->state: %s",
 374                 armv7m_mode_strings[armv7m->core_mode],
 375                 *(uint32_t *)(arm->pc->value),
 376                 target_state_name(target));
 377
 378         return retval;
 379 }
 380
 381 static int stm32_stlink_poll(struct target *target)
 382 {
 383         enum target_state state;
 384         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 385         struct armv7m_common *armv7m = target_to_armv7m(target);
 386
 387         state = stlink_if->layout->api->state(stlink_if->fd);
 388
 389         if (state == TARGET_UNKNOWN) {
 390                 LOG_ERROR("jtag status contains invalid mode value - communication failure");
 391                 return ERROR_TARGET_FAILURE;
 392         }
 393
 394         if (target->state == state)
 395                 return ERROR_OK;
 396
 397         if (state == TARGET_HALTED) {
 398                 target->state = state;
 399
 400                 int retval = stlink_debug_entry(target);
 401                 if (retval != ERROR_OK)
 402                         return retval;
 403
 404                 if (arm_semihosting(target, &retval) != 0)
 405                         return retval;
 406
 407                 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 408                 LOG_DEBUG("halted: PC: 0x%08x", buf_get_u32(armv7m->arm.pc->value, 0, 32));
 409         }
 410
 411         return ERROR_OK;
 412 }
 413
 414 static int stm32_stlink_assert_reset(struct target *target)
 415 {
 416         int res = ERROR_OK;
 417         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 418         struct armv7m_common *armv7m = target_to_armv7m(target);
 419         bool use_srst_fallback = true;
 420
 421         LOG_DEBUG("%s", __func__);
 422
 423         enum reset_types jtag_reset_config = jtag_get_reset_config();
 424
 425         bool srst_asserted = false;
 426
 427         if (jtag_reset_config & RESET_SRST_NO_GATING) {
 428                 jtag_add_reset(0, 1);
 429                 res = stlink_if->layout->api->assert_srst(stlink_if->fd, 0);
 430                 srst_asserted = true;
 431         }
 432
 433         stlink_if->layout->api->write_debug_reg(stlink_if->fd, DCB_DHCSR, DBGKEY|C_DEBUGEN);
 434
 435         /* only set vector catch if halt is requested */
 436         if (target->reset_halt)
 437                 stlink_if->layout->api->write_debug_reg(stlink_if->fd, DCB_DEMCR, VC_CORERESET);
 438         else
 439                 stlink_if->layout->api->write_debug_reg(stlink_if->fd, DCB_DEMCR, 0);
 440
 441         if (jtag_reset_config & RESET_HAS_SRST) {
 442                 if (!srst_asserted) {
 443                         jtag_add_reset(0, 1);
 444                         res = stlink_if->layout->api->assert_srst(stlink_if->fd, 0);
 445                 }
 446                 if (res == ERROR_COMMAND_NOTFOUND)
 447                         LOG_ERROR("Hardware srst not supported, falling back to software reset");
 448                 else if (res == ERROR_OK) {
 449                         /* hardware srst supported */
 450                         use_srst_fallback = false;
 451                 }
 452         }
 453
 454         if (use_srst_fallback) {
 455                 /* stlink v1 api does not support hardware srst, so we use a software reset fallback */
 456                 stlink_if->layout->api->write_debug_reg(stlink_if->fd, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ);
 457         }
 458
 459         res = stlink_if->layout->api->reset(stlink_if->fd);
 460
 461         if (res != ERROR_OK)
 462                 return res;
 463
 464         /* registers are now invalid */
 465         register_cache_invalidate(armv7m->core_cache);
 466
 467         if (target->reset_halt) {
 468                 target->state = TARGET_RESET;
 469                 target->debug_reason = DBG_REASON_DBGRQ;
 470         } else {
 471                 target->state = TARGET_HALTED;
 472         }
 473
 474         return ERROR_OK;
 475 }
 476
 477 static int stm32_stlink_deassert_reset(struct target *target)
 478 {
 479         int res;
 480         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 481
 482         enum reset_types jtag_reset_config = jtag_get_reset_config();
 483
 484         LOG_DEBUG("%s", __func__);
 485
 486         if (jtag_reset_config & RESET_HAS_SRST)
 487                 stlink_if->layout->api->assert_srst(stlink_if->fd, 1);
 488
 489         /* virtual deassert reset, we need it for the internal
 490          * jtag state machine
 491          */
 492         jtag_add_reset(0, 0);
 493
 494         if (!target->reset_halt) {
 495                 res = target_resume(target, 1, 0, 0, 0);
 496
 497                 if (res != ERROR_OK)
 498                         return res;
 499         }
 500
 501         return ERROR_OK;
 502 }
 503
 504 static int stm32_stlink_soft_reset_halt(struct target *target)
 505 {
 506         LOG_DEBUG("%s", __func__);
 507         return ERROR_OK;
 508 }
 509
 510 static int stm32_stlink_halt(struct target *target)
 511 {
 512         int res;
 513         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 514
 515         LOG_DEBUG("%s", __func__);
 516
 517         if (target->state == TARGET_HALTED) {
 518                 LOG_DEBUG("target was already halted");
 519                 return ERROR_OK;
 520         }
 521
 522         if (target->state == TARGET_UNKNOWN)
 523                 LOG_WARNING("target was in unknown state when halt was requested");
 524
 525         res = stlink_if->layout->api->halt(stlink_if->fd);
 526
 527         if (res != ERROR_OK)
 528                 return res;
 529
 530         target->debug_reason = DBG_REASON_DBGRQ;
 531
 532         return ERROR_OK;
 533 }
 534
 535 static int stm32_stlink_resume(struct target *target, int current,
 536                 uint32_t address, int handle_breakpoints,
 537                 int debug_execution)
 538 {
 539         int res;
 540         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 541         struct armv7m_common *armv7m = target_to_armv7m(target);
 542         uint32_t resume_pc;
 543         struct breakpoint *breakpoint = NULL;
 544         struct reg *pc;
 545
 546         LOG_DEBUG("%s %d 0x%08x %d %d", __func__, current, address,
 547                         handle_breakpoints, debug_execution);
 548
 549         if (target->state != TARGET_HALTED) {
 550                 LOG_WARNING("target not halted");
 551                 return ERROR_TARGET_NOT_HALTED;
 552         }
 553
 554         pc = armv7m->arm.pc;
 555         if (!current) {
 556                 buf_set_u32(pc->value, 0, 32, address);
 557                 pc->dirty = true;
 558                 pc->valid = true;
 559         }
 560
 561         if (!breakpoint_find(target, buf_get_u32(pc->value, 0, 32))
 562                         && !debug_execution) {
 563                 armv7m_maybe_skip_bkpt_inst(target, NULL);
 564         }
 565
 566         resume_pc = buf_get_u32(pc->value, 0, 32);
 567
 568         armv7m_restore_context(target);
 569
 570         /* registers are now invalid */
 571         register_cache_invalidate(armv7m->core_cache);
 572
 573         /* the front-end may request us not to handle breakpoints */
 574         if (handle_breakpoints) {
 575                 /* Single step past breakpoint at current address */
 576                 breakpoint = breakpoint_find(target, resume_pc);
 577                 if (breakpoint) {
 578                         LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 " (ID: %d)",
 579                                         breakpoint->address,
 580                                         breakpoint->unique_id);
 581                         cortex_m3_unset_breakpoint(target, breakpoint);
 582
 583                         res = stlink_if->layout->api->step(stlink_if->fd);
 584
 585                         if (res != ERROR_OK)
 586                                 return res;
 587
 588                         cortex_m3_set_breakpoint(target, breakpoint);
 589                 }
 590         }
 591
 592         res = stlink_if->layout->api->run(stlink_if->fd);
 593
 594         if (res != ERROR_OK)
 595                 return res;
 596
 597         target->state = TARGET_RUNNING;
 598         target->debug_reason = DBG_REASON_NOTHALTED;
 599
 600         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 601
 602         return ERROR_OK;
 603 }
 604
 605 static int stm32_stlink_step(struct target *target, int current,
 606                 uint32_t address, int handle_breakpoints)
 607 {
 608         int res;
 609         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 610         struct armv7m_common *armv7m = target_to_armv7m(target);
 611         struct breakpoint *breakpoint = NULL;
 612         struct reg *pc = armv7m->arm.pc;
 613         bool bkpt_inst_found = false;
 614
 615         LOG_DEBUG("%s", __func__);
 616
 617         if (target->state != TARGET_HALTED) {
 618                 LOG_WARNING("target not halted");
 619                 return ERROR_TARGET_NOT_HALTED;
 620         }
 621
 622         if (!current) {
 623                 buf_set_u32(pc->value, 0, 32, address);
 624                 pc->dirty = true;
 625                 pc->valid = true;
 626         }
 627
 628         uint32_t pc_value = buf_get_u32(pc->value, 0, 32);
 629
 630         /* the front-end may request us not to handle breakpoints */
 631         if (handle_breakpoints) {
 632                 breakpoint = breakpoint_find(target, pc_value);
 633                 if (breakpoint)
 634                         cortex_m3_unset_breakpoint(target, breakpoint);
 635         }
 636
 637         armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found);
 638
 639         target->debug_reason = DBG_REASON_SINGLESTEP;
 640
 641         armv7m_restore_context(target);
 642
 643         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 644
 645         res = stlink_if->layout->api->step(stlink_if->fd);
 646
 647         if (res != ERROR_OK)
 648                 return res;
 649
 650         /* registers are now invalid */
 651         register_cache_invalidate(armv7m->core_cache);
 652
 653         if (breakpoint)
 654                 cortex_m3_set_breakpoint(target, breakpoint);
 655
 656         stlink_debug_entry(target);
 657         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 658
 659         LOG_INFO("halted: PC: 0x%08x", buf_get_u32(armv7m->arm.pc->value, 0, 32));
 660
 661         return ERROR_OK;
 662 }
 663
 664 static int stm32_stlink_read_memory(struct target *target, uint32_t address,
 665                 uint32_t size, uint32_t count,
 666                 uint8_t *buffer)
 667 {
 668         int res;
 669         uint32_t buffer_threshold = 128;
 670         uint32_t addr_increment = 4;
 671         uint32_t c;
 672         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 673
 674         if (!count || !buffer)
 675                 return ERROR_COMMAND_SYNTAX_ERROR;
 676
 677         LOG_DEBUG("%s 0x%08x %d %d", __func__, address, size, count);
 678
 679         /* prepare byte count, buffer threshold
 680          * and address increment for none 32bit access
 681          */
 682         if (size != 4) {
 683                 count *= size;
 684                 buffer_threshold = 64;
 685                 addr_increment = 1;
 686         }
 687
 688         while (count) {
 689                 if (count > buffer_threshold)
 690                         c = buffer_threshold;
 691                 else
 692                         c = count;
 693
 694                 if (size != 4)
 695                         res = stlink_if->layout->api->read_mem8(stlink_if->fd,
 696                                         address, c, buffer);
 697                 else
 698                         res = stlink_if->layout->api->read_mem32(stlink_if->fd,
 699                                         address, c, buffer);
 700
 701                 if (res != ERROR_OK)
 702                         return res;
 703
 704                 address += (c * addr_increment);
 705                 buffer += (c * addr_increment);
 706                 count -= c;
 707         }
 708
 709         return ERROR_OK;
 710 }
 711
 712 static int stm32_stlink_write_memory(struct target *target, uint32_t address,
 713                 uint32_t size, uint32_t count,
 714                 const uint8_t *buffer)
 715 {
 716         int res;
 717         uint32_t buffer_threshold = 128;
 718         uint32_t addr_increment = 4;
 719         uint32_t c;
 720         struct stlink_interface_s *stlink_if = target_to_stlink(target);
 721
 722         if (!count || !buffer)
 723                 return ERROR_COMMAND_SYNTAX_ERROR;
 724
 725         LOG_DEBUG("%s 0x%08x %d %d", __func__, address, size, count);
 726
 727         /* prepare byte count, buffer threshold
 728          * and address increment for none 32bit access
 729          */
 730         if (size != 4) {
 731                 count *= size;
 732                 buffer_threshold = 64;
 733                 addr_increment = 1;
 734         }
 735
 736         while (count) {
 737                 if (count > buffer_threshold)
 738                         c = buffer_threshold;
 739                 else
 740                         c = count;
 741
 742                 if (size != 4)
 743                         res = stlink_if->layout->api->write_mem8(stlink_if->fd,
 744                                         address, c, buffer);
 745                 else
 746                         res = stlink_if->layout->api->write_mem32(stlink_if->fd,
 747                                         address, c, buffer);
 748
 749                 if (res != ERROR_OK)
 750                         return res;
 751
 752                 address += (c * addr_increment);
 753                 buffer += (c * addr_increment);
 754                 count -= c;
 755         }
 756
 757         return ERROR_OK;
 758 }
 759
 760 static int stm32_stlink_bulk_write_memory(struct target *target,
 761                 uint32_t address, uint32_t count,
 762                 const uint8_t *buffer)
 763 {
 764         return stm32_stlink_write_memory(target, address, 4, count, buffer);
 765 }
 766
 767 static const struct command_registration stm32_stlink_command_handlers[] = {
 768         {
 769                 .chain = arm_command_handlers,
 770         },
 771         COMMAND_REGISTRATION_DONE
 772 };
 773
 774 struct target_type stm32_stlink_target = {
 775         .name = "stm32_stlink",
 776
 777         .init_target = stm32_stlink_init_target,
 778         .target_create = stm32_stlink_target_create,
 779         .examine = cortex_m3_examine,
 780         .commands = stm32_stlink_command_handlers,
 781
 782         .poll = stm32_stlink_poll,
 783         .arch_state = armv7m_arch_state,
 784
 785         .assert_reset = stm32_stlink_assert_reset,
 786         .deassert_reset = stm32_stlink_deassert_reset,
 787         .soft_reset_halt = stm32_stlink_soft_reset_halt,
 788
 789         .halt = stm32_stlink_halt,
 790         .resume = stm32_stlink_resume,
 791         .step = stm32_stlink_step,
 792
 793         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
 794
 795         .read_memory = stm32_stlink_read_memory,
 796         .write_memory = stm32_stlink_write_memory,
 797         .bulk_write_memory = stm32_stlink_bulk_write_memory,
 798         .checksum_memory = armv7m_checksum_memory,
 799         .blank_check_memory = armv7m_blank_check_memory,
 800
 801         .run_algorithm = armv7m_run_algorithm,
 802         .start_algorithm = armv7m_start_algorithm,
 803         .wait_algorithm = armv7m_wait_algorithm,
 804
 805         .add_breakpoint = cortex_m3_add_breakpoint,
 806         .remove_breakpoint = cortex_m3_remove_breakpoint,
 807         .add_watchpoint = cortex_m3_add_watchpoint,
 808         .remove_watchpoint = cortex_m3_remove_watchpoint,
 809 };