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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2006 by Magnus Lundin                                   *
   6  *   lundin@mlu.mine.nu                                                    *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  23  *                                                                         *
  24  *                                                                         *
  25  *   Cortex-M3(tm) TRM, ARM DDI 0337E (r1p1) and 0337G (r2p0)              *
  26  *                                                                         *
  27  ***************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include "jtag/interface.h"
  33 #include "breakpoints.h"
  34 #include "cortex_m.h"
  35 #include "target_request.h"
  36 #include "target_type.h"
  37 #include "arm_adi_v5.h"
  38 #include "arm_disassembler.h"
  39 #include "register.h"
  40 #include "arm_opcodes.h"
  41 #include "arm_semihosting.h"
  42 #include <helper/time_support.h>
  43 #include <rtt/rtt.h>
  44
  45 /* NOTE:  most of this should work fine for the Cortex-M1 and
  46  * Cortex-M0 cores too, although they're ARMv6-M not ARMv7-M.
  47  * Some differences:  M0/M1 doesn't have FPB remapping or the
  48  * DWT tracing/profiling support.  (So the cycle counter will
  49  * not be usable; the other stuff isn't currently used here.)
  50  *
  51  * Although there are some workarounds for errata seen only in r0p0
  52  * silicon, such old parts are hard to find and thus not much tested
  53  * any longer.
  54  */
  55
  56 /* Supported Cortex-M Cores */
  57 static const struct cortex_m_part_info cortex_m_parts[] = {
  58         {
  59                 .partno = CORTEX_M0_PARTNO,
  60                 .name = "Cortex-M0",
  61                 .arch = ARM_ARCH_V6M,
  62         },
  63         {
  64                 .partno = CORTEX_M0P_PARTNO,
  65                 .name = "Cortex-M0+",
  66                 .arch = ARM_ARCH_V6M,
  67         },
  68         {
  69                 .partno = CORTEX_M1_PARTNO,
  70                 .name = "Cortex-M1",
  71                 .arch = ARM_ARCH_V6M,
  72         },
  73         {
  74                 .partno = CORTEX_M3_PARTNO,
  75                 .name = "Cortex-M3",
  76                 .arch = ARM_ARCH_V7M,
  77                 .flags = CORTEX_M_F_TAR_AUTOINCR_BLOCK_4K,
  78         },
  79         {
  80                 .partno = CORTEX_M4_PARTNO,
  81                 .name = "Cortex-M4",
  82                 .arch = ARM_ARCH_V7M,
  83                 .flags = CORTEX_M_F_HAS_FPV4 | CORTEX_M_F_TAR_AUTOINCR_BLOCK_4K,
  84         },
  85         {
  86                 .partno = CORTEX_M7_PARTNO,
  87                 .name = "Cortex-M7",
  88                 .arch = ARM_ARCH_V7M,
  89                 .flags = CORTEX_M_F_HAS_FPV5,
  90         },
  91         {
  92                 .partno = CORTEX_M23_PARTNO,
  93                 .name = "Cortex-M23",
  94                 .arch = ARM_ARCH_V8M,
  95         },
  96         {
  97                 .partno = CORTEX_M33_PARTNO,
  98                 .name = "Cortex-M33",
  99                 .arch = ARM_ARCH_V8M,
 100                 .flags = CORTEX_M_F_HAS_FPV5,
 101         },
 102         {
 103                 .partno = CORTEX_M35P_PARTNO,
 104                 .name = "Cortex-M35P",
 105                 .arch = ARM_ARCH_V8M,
 106                 .flags = CORTEX_M_F_HAS_FPV5,
 107         },
 108         {
 109                 .partno = CORTEX_M55_PARTNO,
 110                 .name = "Cortex-M55",
 111                 .arch = ARM_ARCH_V8M,
 112                 .flags = CORTEX_M_F_HAS_FPV5,
 113         },
 114 };
 115
 116 /* forward declarations */
 117 static int cortex_m_store_core_reg_u32(struct target *target,
 118                 uint32_t num, uint32_t value);
 119 static void cortex_m_dwt_free(struct target *target);
 120
 121 static int cortex_m_load_core_reg_u32(struct target *target,
 122                 uint32_t regsel, uint32_t *value)
 123 {
 124         struct armv7m_common *armv7m = target_to_armv7m(target);
 125         int retval;
 126         uint32_t dcrdr;
 127
 128         /* because the DCB_DCRDR is used for the emulated dcc channel
 129          * we have to save/restore the DCB_DCRDR when used */
 130         if (target->dbg_msg_enabled) {
 131                 retval = mem_ap_read_u32(armv7m->debug_ap, DCB_DCRDR, &dcrdr);
 132                 if (retval != ERROR_OK)
 133                         return retval;
 134         }
 135
 136         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRSR, regsel);
 137         if (retval != ERROR_OK)
 138                 return retval;
 139
 140         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DCRDR, value);
 141         if (retval != ERROR_OK)
 142                 return retval;
 143
 144         if (target->dbg_msg_enabled) {
 145                 /* restore DCB_DCRDR - this needs to be in a separate
 146                  * transaction otherwise the emulated DCC channel breaks */
 147                 if (retval == ERROR_OK)
 148                         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRDR, dcrdr);
 149         }
 150
 151         return retval;
 152 }
 153
 154 static int cortex_m_store_core_reg_u32(struct target *target,
 155                 uint32_t regsel, uint32_t value)
 156 {
 157         struct armv7m_common *armv7m = target_to_armv7m(target);
 158         int retval;
 159         uint32_t dcrdr;
 160
 161         /* because the DCB_DCRDR is used for the emulated dcc channel
 162          * we have to save/restore the DCB_DCRDR when used */
 163         if (target->dbg_msg_enabled) {
 164                 retval = mem_ap_read_u32(armv7m->debug_ap, DCB_DCRDR, &dcrdr);
 165                 if (retval != ERROR_OK)
 166                         return retval;
 167         }
 168
 169         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, value);
 170         if (retval != ERROR_OK)
 171                 return retval;
 172
 173         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRSR, regsel | DCRSR_WNR);
 174         if (retval != ERROR_OK)
 175                 return retval;
 176
 177         if (target->dbg_msg_enabled) {
 178                 /* restore DCB_DCRDR - this needs to be in a separate
 179                  * transaction otherwise the emulated DCC channel breaks */
 180                 if (retval == ERROR_OK)
 181                         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRDR, dcrdr);
 182         }
 183
 184         return retval;
 185 }
 186
 187 static int cortex_m_write_debug_halt_mask(struct target *target,
 188         uint32_t mask_on, uint32_t mask_off)
 189 {
 190         struct cortex_m_common *cortex_m = target_to_cm(target);
 191         struct armv7m_common *armv7m = &cortex_m->armv7m;
 192
 193         /* mask off status bits */
 194         cortex_m->dcb_dhcsr &= ~((0xFFFFul << 16) | mask_off);
 195         /* create new register mask */
 196         cortex_m->dcb_dhcsr |= DBGKEY | C_DEBUGEN | mask_on;
 197
 198         return mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DHCSR, cortex_m->dcb_dhcsr);
 199 }
 200
 201 static int cortex_m_set_maskints(struct target *target, bool mask)
 202 {
 203         struct cortex_m_common *cortex_m = target_to_cm(target);
 204         if (!!(cortex_m->dcb_dhcsr & C_MASKINTS) != mask)
 205                 return cortex_m_write_debug_halt_mask(target, mask ? C_MASKINTS : 0, mask ? 0 : C_MASKINTS);
 206         else
 207                 return ERROR_OK;
 208 }
 209
 210 static int cortex_m_set_maskints_for_halt(struct target *target)
 211 {
 212         struct cortex_m_common *cortex_m = target_to_cm(target);
 213         switch (cortex_m->isrmasking_mode) {
 214                 case CORTEX_M_ISRMASK_AUTO:
 215                         /* interrupts taken at resume, whether for step or run -> no mask */
 216                         return cortex_m_set_maskints(target, false);
 217
 218                 case CORTEX_M_ISRMASK_OFF:
 219                         /* interrupts never masked */
 220                         return cortex_m_set_maskints(target, false);
 221
 222                 case CORTEX_M_ISRMASK_ON:
 223                         /* interrupts always masked */
 224                         return cortex_m_set_maskints(target, true);
 225
 226                 case CORTEX_M_ISRMASK_STEPONLY:
 227                         /* interrupts masked for single step only -> mask now if MASKINTS
 228                          * erratum, otherwise only mask before stepping */
 229                         return cortex_m_set_maskints(target, cortex_m->maskints_erratum);
 230         }
 231         return ERROR_OK;
 232 }
 233
 234 static int cortex_m_set_maskints_for_run(struct target *target)
 235 {
 236         switch (target_to_cm(target)->isrmasking_mode) {
 237                 case CORTEX_M_ISRMASK_AUTO:
 238                         /* interrupts taken at resume, whether for step or run -> no mask */
 239                         return cortex_m_set_maskints(target, false);
 240
 241                 case CORTEX_M_ISRMASK_OFF:
 242                         /* interrupts never masked */
 243                         return cortex_m_set_maskints(target, false);
 244
 245                 case CORTEX_M_ISRMASK_ON:
 246                         /* interrupts always masked */
 247                         return cortex_m_set_maskints(target, true);
 248
 249                 case CORTEX_M_ISRMASK_STEPONLY:
 250                         /* interrupts masked for single step only -> no mask */
 251                         return cortex_m_set_maskints(target, false);
 252         }
 253         return ERROR_OK;
 254 }
 255
 256 static int cortex_m_set_maskints_for_step(struct target *target)
 257 {
 258         switch (target_to_cm(target)->isrmasking_mode) {
 259                 case CORTEX_M_ISRMASK_AUTO:
 260                         /* the auto-interrupt should already be done -> mask */
 261                         return cortex_m_set_maskints(target, true);
 262
 263                 case CORTEX_M_ISRMASK_OFF:
 264                         /* interrupts never masked */
 265                         return cortex_m_set_maskints(target, false);
 266
 267                 case CORTEX_M_ISRMASK_ON:
 268                         /* interrupts always masked */
 269                         return cortex_m_set_maskints(target, true);
 270
 271                 case CORTEX_M_ISRMASK_STEPONLY:
 272                         /* interrupts masked for single step only -> mask */
 273                         return cortex_m_set_maskints(target, true);
 274         }
 275         return ERROR_OK;
 276 }
 277
 278 static int cortex_m_clear_halt(struct target *target)
 279 {
 280         struct cortex_m_common *cortex_m = target_to_cm(target);
 281         struct armv7m_common *armv7m = &cortex_m->armv7m;
 282         int retval;
 283
 284         /* clear step if any */
 285         cortex_m_write_debug_halt_mask(target, C_HALT, C_STEP);
 286
 287         /* Read Debug Fault Status Register */
 288         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_DFSR, &cortex_m->nvic_dfsr);
 289         if (retval != ERROR_OK)
 290                 return retval;
 291
 292         /* Clear Debug Fault Status */
 293         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_DFSR, cortex_m->nvic_dfsr);
 294         if (retval != ERROR_OK)
 295                 return retval;
 296         LOG_DEBUG(" NVIC_DFSR 0x%" PRIx32 "", cortex_m->nvic_dfsr);
 297
 298         return ERROR_OK;
 299 }
 300
 301 static int cortex_m_single_step_core(struct target *target)
 302 {
 303         struct cortex_m_common *cortex_m = target_to_cm(target);
 304         int retval;
 305
 306         /* Mask interrupts before clearing halt, if not done already.  This avoids
 307          * Erratum 377497 (fixed in r1p0) where setting MASKINTS while clearing
 308          * HALT can put the core into an unknown state.
 309          */
 310         if (!(cortex_m->dcb_dhcsr & C_MASKINTS)) {
 311                 retval = cortex_m_write_debug_halt_mask(target, C_MASKINTS, 0);
 312                 if (retval != ERROR_OK)
 313                         return retval;
 314         }
 315         retval = cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
 316         if (retval != ERROR_OK)
 317                 return retval;
 318         LOG_DEBUG(" ");
 319
 320         /* restore dhcsr reg */
 321         cortex_m_clear_halt(target);
 322
 323         return ERROR_OK;
 324 }
 325
 326 static int cortex_m_enable_fpb(struct target *target)
 327 {
 328         int retval = target_write_u32(target, FP_CTRL, 3);
 329         if (retval != ERROR_OK)
 330                 return retval;
 331
 332         /* check the fpb is actually enabled */
 333         uint32_t fpctrl;
 334         retval = target_read_u32(target, FP_CTRL, &fpctrl);
 335         if (retval != ERROR_OK)
 336                 return retval;
 337
 338         if (fpctrl & 1)
 339                 return ERROR_OK;
 340
 341         return ERROR_FAIL;
 342 }
 343
 344 static int cortex_m_endreset_event(struct target *target)
 345 {
 346         int retval;
 347         uint32_t dcb_demcr;
 348         struct cortex_m_common *cortex_m = target_to_cm(target);
 349         struct armv7m_common *armv7m = &cortex_m->armv7m;
 350         struct adiv5_dap *swjdp = cortex_m->armv7m.arm.dap;
 351         struct cortex_m_fp_comparator *fp_list = cortex_m->fp_comparator_list;
 352         struct cortex_m_dwt_comparator *dwt_list = cortex_m->dwt_comparator_list;
 353
 354         /* REVISIT The four debug monitor bits are currently ignored... */
 355         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &dcb_demcr);
 356         if (retval != ERROR_OK)
 357                 return retval;
 358         LOG_DEBUG("DCB_DEMCR = 0x%8.8" PRIx32 "", dcb_demcr);
 359
 360         /* this register is used for emulated dcc channel */
 361         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, 0);
 362         if (retval != ERROR_OK)
 363                 return retval;
 364
 365         /* Enable debug requests */
 366         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 367         if (retval != ERROR_OK)
 368                 return retval;
 369         if (!(cortex_m->dcb_dhcsr & C_DEBUGEN)) {
 370                 retval = cortex_m_write_debug_halt_mask(target, 0, C_HALT | C_STEP | C_MASKINTS);
 371                 if (retval != ERROR_OK)
 372                         return retval;
 373         }
 374
 375         /* Restore proper interrupt masking setting for running CPU. */
 376         cortex_m_set_maskints_for_run(target);
 377
 378         /* Enable features controlled by ITM and DWT blocks, and catch only
 379          * the vectors we were told to pay attention to.
 380          *
 381          * Target firmware is responsible for all fault handling policy
 382          * choices *EXCEPT* explicitly scripted overrides like "vector_catch"
 383          * or manual updates to the NVIC SHCSR and CCR registers.
 384          */
 385         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR, TRCENA | armv7m->demcr);
 386         if (retval != ERROR_OK)
 387                 return retval;
 388
 389         /* Paranoia: evidently some (early?) chips don't preserve all the
 390          * debug state (including FPB, DWT, etc) across reset...
 391          */
 392
 393         /* Enable FPB */
 394         retval = cortex_m_enable_fpb(target);
 395         if (retval != ERROR_OK) {
 396                 LOG_ERROR("Failed to enable the FPB");
 397                 return retval;
 398         }
 399
 400         cortex_m->fpb_enabled = true;
 401
 402         /* Restore FPB registers */
 403         for (unsigned int i = 0; i < cortex_m->fp_num_code + cortex_m->fp_num_lit; i++) {
 404                 retval = target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
 405                 if (retval != ERROR_OK)
 406                         return retval;
 407         }
 408
 409         /* Restore DWT registers */
 410         for (unsigned int i = 0; i < cortex_m->dwt_num_comp; i++) {
 411                 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 0,
 412                                 dwt_list[i].comp);
 413                 if (retval != ERROR_OK)
 414                         return retval;
 415                 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 4,
 416                                 dwt_list[i].mask);
 417                 if (retval != ERROR_OK)
 418                         return retval;
 419                 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 8,
 420                                 dwt_list[i].function);
 421                 if (retval != ERROR_OK)
 422                         return retval;
 423         }
 424         retval = dap_run(swjdp);
 425         if (retval != ERROR_OK)
 426                 return retval;
 427
 428         register_cache_invalidate(armv7m->arm.core_cache);
 429
 430         /* make sure we have latest dhcsr flags */
 431         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 432
 433         return retval;
 434 }
 435
 436 static int cortex_m_examine_debug_reason(struct target *target)
 437 {
 438         struct cortex_m_common *cortex_m = target_to_cm(target);
 439
 440         /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason
 441          * only check the debug reason if we don't know it already */
 442
 443         if ((target->debug_reason != DBG_REASON_DBGRQ)
 444                 && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
 445                 if (cortex_m->nvic_dfsr & DFSR_BKPT) {
 446                         target->debug_reason = DBG_REASON_BREAKPOINT;
 447                         if (cortex_m->nvic_dfsr & DFSR_DWTTRAP)
 448                                 target->debug_reason = DBG_REASON_WPTANDBKPT;
 449                 } else if (cortex_m->nvic_dfsr & DFSR_DWTTRAP)
 450                         target->debug_reason = DBG_REASON_WATCHPOINT;
 451                 else if (cortex_m->nvic_dfsr & DFSR_VCATCH)
 452                         target->debug_reason = DBG_REASON_BREAKPOINT;
 453                 else if (cortex_m->nvic_dfsr & DFSR_EXTERNAL)
 454                         target->debug_reason = DBG_REASON_DBGRQ;
 455                 else    /* HALTED */
 456                         target->debug_reason = DBG_REASON_UNDEFINED;
 457         }
 458
 459         return ERROR_OK;
 460 }
 461
 462 static int cortex_m_examine_exception_reason(struct target *target)
 463 {
 464         uint32_t shcsr = 0, except_sr = 0, cfsr = -1, except_ar = -1;
 465         struct armv7m_common *armv7m = target_to_armv7m(target);
 466         struct adiv5_dap *swjdp = armv7m->arm.dap;
 467         int retval;
 468
 469         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_SHCSR, &shcsr);
 470         if (retval != ERROR_OK)
 471                 return retval;
 472         switch (armv7m->exception_number) {
 473                 case 2: /* NMI */
 474                         break;
 475                 case 3: /* Hard Fault */
 476                         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_HFSR, &except_sr);
 477                         if (retval != ERROR_OK)
 478                                 return retval;
 479                         if (except_sr & 0x40000000) {
 480                                 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &cfsr);
 481                                 if (retval != ERROR_OK)
 482                                         return retval;
 483                         }
 484                         break;
 485                 case 4: /* Memory Management */
 486                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
 487                         if (retval != ERROR_OK)
 488                                 return retval;
 489                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_MMFAR, &except_ar);
 490                         if (retval != ERROR_OK)
 491                                 return retval;
 492                         break;
 493                 case 5: /* Bus Fault */
 494                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
 495                         if (retval != ERROR_OK)
 496                                 return retval;
 497                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_BFAR, &except_ar);
 498                         if (retval != ERROR_OK)
 499                                 return retval;
 500                         break;
 501                 case 6: /* Usage Fault */
 502                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
 503                         if (retval != ERROR_OK)
 504                                 return retval;
 505                         break;
 506                 case 7: /* Secure Fault */
 507                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_SFSR, &except_sr);
 508                         if (retval != ERROR_OK)
 509                                 return retval;
 510                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_SFAR, &except_ar);
 511                         if (retval != ERROR_OK)
 512                                 return retval;
 513                         break;
 514                 case 11:        /* SVCall */
 515                         break;
 516                 case 12:        /* Debug Monitor */
 517                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_DFSR, &except_sr);
 518                         if (retval != ERROR_OK)
 519                                 return retval;
 520                         break;
 521                 case 14:        /* PendSV */
 522                         break;
 523                 case 15:        /* SysTick */
 524                         break;
 525                 default:
 526                         except_sr = 0;
 527                         break;
 528         }
 529         retval = dap_run(swjdp);
 530         if (retval == ERROR_OK)
 531                 LOG_DEBUG("%s SHCSR 0x%" PRIx32 ", SR 0x%" PRIx32
 532                         ", CFSR 0x%" PRIx32 ", AR 0x%" PRIx32,
 533                         armv7m_exception_string(armv7m->exception_number),
 534                         shcsr, except_sr, cfsr, except_ar);
 535         return retval;
 536 }
 537
 538 static int cortex_m_debug_entry(struct target *target)
 539 {
 540         int i;
 541         uint32_t xPSR;
 542         int retval;
 543         struct cortex_m_common *cortex_m = target_to_cm(target);
 544         struct armv7m_common *armv7m = &cortex_m->armv7m;
 545         struct arm *arm = &armv7m->arm;
 546         struct reg *r;
 547
 548         LOG_DEBUG(" ");
 549
 550         /* Do this really early to minimize the window where the MASKINTS erratum
 551          * can pile up pending interrupts. */
 552         cortex_m_set_maskints_for_halt(target);
 553
 554         cortex_m_clear_halt(target);
 555         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 556         if (retval != ERROR_OK)
 557                 return retval;
 558
 559         retval = armv7m->examine_debug_reason(target);
 560         if (retval != ERROR_OK)
 561                 return retval;
 562
 563         /* examine PE security state */
 564         bool secure_state = false;
 565         if (armv7m->arm.arch == ARM_ARCH_V8M) {
 566                 uint32_t dscsr;
 567
 568                 retval = mem_ap_read_u32(armv7m->debug_ap, DCB_DSCSR, &dscsr);
 569                 if (retval != ERROR_OK)
 570                         return retval;
 571
 572                 secure_state = (dscsr & DSCSR_CDS) == DSCSR_CDS;
 573         }
 574
 575         /* Examine target state and mode
 576          * First load register accessible through core debug port */
 577         int num_regs = arm->core_cache->num_regs;
 578
 579         for (i = 0; i < num_regs; i++) {
 580                 r = &armv7m->arm.core_cache->reg_list[i];
 581                 if (r->exist && !r->valid)
 582                         arm->read_core_reg(target, r, i, ARM_MODE_ANY);
 583         }
 584
 585         r = arm->cpsr;
 586         xPSR = buf_get_u32(r->value, 0, 32);
 587
 588         /* Are we in an exception handler */
 589         if (xPSR & 0x1FF) {
 590                 armv7m->exception_number = (xPSR & 0x1FF);
 591
 592                 arm->core_mode = ARM_MODE_HANDLER;
 593                 arm->map = armv7m_msp_reg_map;
 594         } else {
 595                 unsigned control = buf_get_u32(arm->core_cache
 596                                 ->reg_list[ARMV7M_CONTROL].value, 0, 3);
 597
 598                 /* is this thread privileged? */
 599                 arm->core_mode = control & 1
 600                         ? ARM_MODE_USER_THREAD
 601                         : ARM_MODE_THREAD;
 602
 603                 /* which stack is it using? */
 604                 if (control & 2)
 605                         arm->map = armv7m_psp_reg_map;
 606                 else
 607                         arm->map = armv7m_msp_reg_map;
 608
 609                 armv7m->exception_number = 0;
 610         }
 611
 612         if (armv7m->exception_number)
 613                 cortex_m_examine_exception_reason(target);
 614
 615         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%" PRIx32 ", cpu in %s state, target->state: %s",
 616                 arm_mode_name(arm->core_mode),
 617                 buf_get_u32(arm->pc->value, 0, 32),
 618                 secure_state ? "Secure" : "Non-Secure",
 619                 target_state_name(target));
 620
 621         if (armv7m->post_debug_entry) {
 622                 retval = armv7m->post_debug_entry(target);
 623                 if (retval != ERROR_OK)
 624                         return retval;
 625         }
 626
 627         return ERROR_OK;
 628 }
 629
 630 static int cortex_m_poll(struct target *target)
 631 {
 632         int detected_failure = ERROR_OK;
 633         int retval = ERROR_OK;
 634         enum target_state prev_target_state = target->state;
 635         struct cortex_m_common *cortex_m = target_to_cm(target);
 636         struct armv7m_common *armv7m = &cortex_m->armv7m;
 637
 638         /* Read from Debug Halting Control and Status Register */
 639         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 640         if (retval != ERROR_OK) {
 641                 target->state = TARGET_UNKNOWN;
 642                 return retval;
 643         }
 644
 645         /* Recover from lockup.  See ARMv7-M architecture spec,
 646          * section B1.5.15 "Unrecoverable exception cases".
 647          */
 648         if (cortex_m->dcb_dhcsr & S_LOCKUP) {
 649                 LOG_ERROR("%s -- clearing lockup after double fault",
 650                         target_name(target));
 651                 cortex_m_write_debug_halt_mask(target, C_HALT, 0);
 652                 target->debug_reason = DBG_REASON_DBGRQ;
 653
 654                 /* We have to execute the rest (the "finally" equivalent, but
 655                  * still throw this exception again).
 656                  */
 657                 detected_failure = ERROR_FAIL;
 658
 659                 /* refresh status bits */
 660                 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 661                 if (retval != ERROR_OK)
 662                         return retval;
 663         }
 664
 665         if (cortex_m->dcb_dhcsr & S_RESET_ST) {
 666                 if (target->state != TARGET_RESET) {
 667                         target->state = TARGET_RESET;
 668                         LOG_INFO("%s: external reset detected", target_name(target));
 669                 }
 670                 return ERROR_OK;
 671         }
 672
 673         if (target->state == TARGET_RESET) {
 674                 /* Cannot switch context while running so endreset is
 675                  * called with target->state == TARGET_RESET
 676                  */
 677                 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%" PRIx32,
 678                         cortex_m->dcb_dhcsr);
 679                 retval = cortex_m_endreset_event(target);
 680                 if (retval != ERROR_OK) {
 681                         target->state = TARGET_UNKNOWN;
 682                         return retval;
 683                 }
 684                 target->state = TARGET_RUNNING;
 685                 prev_target_state = TARGET_RUNNING;
 686         }
 687
 688         if (cortex_m->dcb_dhcsr & S_HALT) {
 689                 target->state = TARGET_HALTED;
 690
 691                 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET)) {
 692                         retval = cortex_m_debug_entry(target);
 693                         if (retval != ERROR_OK)
 694                                 return retval;
 695
 696                         if (arm_semihosting(target, &retval) != 0)
 697                                 return retval;
 698
 699                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 700                 }
 701                 if (prev_target_state == TARGET_DEBUG_RUNNING) {
 702                         LOG_DEBUG(" ");
 703                         retval = cortex_m_debug_entry(target);
 704                         if (retval != ERROR_OK)
 705                                 return retval;
 706
 707                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 708                 }
 709         }
 710
 711         if (target->state == TARGET_UNKNOWN) {
 712                 /* check if processor is retiring instructions or sleeping */
 713                 if (cortex_m->dcb_dhcsr & S_RETIRE_ST || cortex_m->dcb_dhcsr & S_SLEEP) {
 714                         target->state = TARGET_RUNNING;
 715                         retval = ERROR_OK;
 716                 }
 717         }
 718
 719         /* Check that target is truly halted, since the target could be resumed externally */
 720         if ((prev_target_state == TARGET_HALTED) && !(cortex_m->dcb_dhcsr & S_HALT)) {
 721                 /* registers are now invalid */
 722                 register_cache_invalidate(armv7m->arm.core_cache);
 723
 724                 target->state = TARGET_RUNNING;
 725                 LOG_WARNING("%s: external resume detected", target_name(target));
 726                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 727                 retval = ERROR_OK;
 728         }
 729
 730         /* Did we detect a failure condition that we cleared? */
 731         if (detected_failure != ERROR_OK)
 732                 retval = detected_failure;
 733         return retval;
 734 }
 735
 736 static int cortex_m_halt(struct target *target)
 737 {
 738         LOG_DEBUG("target->state: %s",
 739                 target_state_name(target));
 740
 741         if (target->state == TARGET_HALTED) {
 742                 LOG_DEBUG("target was already halted");
 743                 return ERROR_OK;
 744         }
 745
 746         if (target->state == TARGET_UNKNOWN)
 747                 LOG_WARNING("target was in unknown state when halt was requested");
 748
 749         if (target->state == TARGET_RESET) {
 750                 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst()) {
 751                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 752                         return ERROR_TARGET_FAILURE;
 753                 } else {
 754                         /* we came here in a reset_halt or reset_init sequence
 755                          * debug entry was already prepared in cortex_m3_assert_reset()
 756                          */
 757                         target->debug_reason = DBG_REASON_DBGRQ;
 758
 759                         return ERROR_OK;
 760                 }
 761         }
 762
 763         /* Write to Debug Halting Control and Status Register */
 764         cortex_m_write_debug_halt_mask(target, C_HALT, 0);
 765
 766         /* Do this really early to minimize the window where the MASKINTS erratum
 767          * can pile up pending interrupts. */
 768         cortex_m_set_maskints_for_halt(target);
 769
 770         target->debug_reason = DBG_REASON_DBGRQ;
 771
 772         return ERROR_OK;
 773 }
 774
 775 static int cortex_m_soft_reset_halt(struct target *target)
 776 {
 777         struct cortex_m_common *cortex_m = target_to_cm(target);
 778         struct armv7m_common *armv7m = &cortex_m->armv7m;
 779         uint32_t dcb_dhcsr = 0;
 780         int retval, timeout = 0;
 781
 782         /* on single cortex_m MCU soft_reset_halt should be avoided as same functionality
 783          * can be obtained by using 'reset halt' and 'cortex_m reset_config vectreset'.
 784          * As this reset only uses VC_CORERESET it would only ever reset the cortex_m
 785          * core, not the peripherals */
 786         LOG_DEBUG("soft_reset_halt is discouraged, please use 'reset halt' instead.");
 787
 788         if (!cortex_m->vectreset_supported) {
 789                 LOG_ERROR("VECTRESET is not supported on this Cortex-M core");
 790                 return ERROR_FAIL;
 791         }
 792
 793         /* Set C_DEBUGEN */
 794         retval = cortex_m_write_debug_halt_mask(target, 0, C_STEP | C_MASKINTS);
 795         if (retval != ERROR_OK)
 796                 return retval;
 797
 798         /* Enter debug state on reset; restore DEMCR in endreset_event() */
 799         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR,
 800                         TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
 801         if (retval != ERROR_OK)
 802                 return retval;
 803
 804         /* Request a core-only reset */
 805         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_AIRCR,
 806                         AIRCR_VECTKEY | AIRCR_VECTRESET);
 807         if (retval != ERROR_OK)
 808                 return retval;
 809         target->state = TARGET_RESET;
 810
 811         /* registers are now invalid */
 812         register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
 813
 814         while (timeout < 100) {
 815                 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &dcb_dhcsr);
 816                 if (retval == ERROR_OK) {
 817                         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_DFSR,
 818                                         &cortex_m->nvic_dfsr);
 819                         if (retval != ERROR_OK)
 820                                 return retval;
 821                         if ((dcb_dhcsr & S_HALT)
 822                                 && (cortex_m->nvic_dfsr & DFSR_VCATCH)) {
 823                                 LOG_DEBUG("system reset-halted, DHCSR 0x%08x, "
 824                                         "DFSR 0x%08x",
 825                                         (unsigned) dcb_dhcsr,
 826                                         (unsigned) cortex_m->nvic_dfsr);
 827                                 cortex_m_poll(target);
 828                                 /* FIXME restore user's vector catch config */
 829                                 return ERROR_OK;
 830                         } else
 831                                 LOG_DEBUG("waiting for system reset-halt, "
 832                                         "DHCSR 0x%08x, %d ms",
 833                                         (unsigned) dcb_dhcsr, timeout);
 834                 }
 835                 timeout++;
 836                 alive_sleep(1);
 837         }
 838
 839         return ERROR_OK;
 840 }
 841
 842 void cortex_m_enable_breakpoints(struct target *target)
 843 {
 844         struct breakpoint *breakpoint = target->breakpoints;
 845
 846         /* set any pending breakpoints */
 847         while (breakpoint) {
 848                 if (!breakpoint->set)
 849                         cortex_m_set_breakpoint(target, breakpoint);
 850                 breakpoint = breakpoint->next;
 851         }
 852 }
 853
 854 static int cortex_m_resume(struct target *target, int current,
 855         target_addr_t address, int handle_breakpoints, int debug_execution)
 856 {
 857         struct armv7m_common *armv7m = target_to_armv7m(target);
 858         struct breakpoint *breakpoint = NULL;
 859         uint32_t resume_pc;
 860         struct reg *r;
 861
 862         if (target->state != TARGET_HALTED) {
 863                 LOG_WARNING("target not halted");
 864                 return ERROR_TARGET_NOT_HALTED;
 865         }
 866
 867         if (!debug_execution) {
 868                 target_free_all_working_areas(target);
 869                 cortex_m_enable_breakpoints(target);
 870                 cortex_m_enable_watchpoints(target);
 871         }
 872
 873         if (debug_execution) {
 874                 r = armv7m->arm.core_cache->reg_list + ARMV7M_PRIMASK;
 875
 876                 /* Disable interrupts */
 877                 /* We disable interrupts in the PRIMASK register instead of
 878                  * masking with C_MASKINTS.  This is probably the same issue
 879                  * as Cortex-M3 Erratum 377493 (fixed in r1p0):  C_MASKINTS
 880                  * in parallel with disabled interrupts can cause local faults
 881                  * to not be taken.
 882                  *
 883                  * This breaks non-debug (application) execution if not
 884                  * called from armv7m_start_algorithm() which saves registers.
 885                  */
 886                 buf_set_u32(r->value, 0, 1, 1);
 887                 r->dirty = true;
 888                 r->valid = true;
 889
 890                 /* Make sure we are in Thumb mode, set xPSR.T bit */
 891                 /* armv7m_start_algorithm() initializes entire xPSR register.
 892                  * This duplicity handles the case when cortex_m_resume()
 893                  * is used with the debug_execution flag directly,
 894                  * not called through armv7m_start_algorithm().
 895                  */
 896                 r = armv7m->arm.cpsr;
 897                 buf_set_u32(r->value, 24, 1, 1);
 898                 r->dirty = true;
 899                 r->valid = true;
 900         }
 901
 902         /* current = 1: continue on current pc, otherwise continue at <address> */
 903         r = armv7m->arm.pc;
 904         if (!current) {
 905                 buf_set_u32(r->value, 0, 32, address);
 906                 r->dirty = true;
 907                 r->valid = true;
 908         }
 909
 910         /* if we halted last time due to a bkpt instruction
 911          * then we have to manually step over it, otherwise
 912          * the core will break again */
 913
 914         if (!breakpoint_find(target, buf_get_u32(r->value, 0, 32))
 915                 && !debug_execution)
 916                 armv7m_maybe_skip_bkpt_inst(target, NULL);
 917
 918         resume_pc = buf_get_u32(r->value, 0, 32);
 919
 920         armv7m_restore_context(target);
 921
 922         /* the front-end may request us not to handle breakpoints */
 923         if (handle_breakpoints) {
 924                 /* Single step past breakpoint at current address */
 925                 breakpoint = breakpoint_find(target, resume_pc);
 926                 if (breakpoint) {
 927                         LOG_DEBUG("unset breakpoint at " TARGET_ADDR_FMT " (ID: %" PRIu32 ")",
 928                                 breakpoint->address,
 929                                 breakpoint->unique_id);
 930                         cortex_m_unset_breakpoint(target, breakpoint);
 931                         cortex_m_single_step_core(target);
 932                         cortex_m_set_breakpoint(target, breakpoint);
 933                 }
 934         }
 935
 936         /* Restart core */
 937         cortex_m_set_maskints_for_run(target);
 938         cortex_m_write_debug_halt_mask(target, 0, C_HALT);
 939
 940         target->debug_reason = DBG_REASON_NOTHALTED;
 941
 942         /* registers are now invalid */
 943         register_cache_invalidate(armv7m->arm.core_cache);
 944
 945         if (!debug_execution) {
 946                 target->state = TARGET_RUNNING;
 947                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 948                 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
 949         } else {
 950                 target->state = TARGET_DEBUG_RUNNING;
 951                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 952                 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
 953         }
 954
 955         return ERROR_OK;
 956 }
 957
 958 /* int irqstepcount = 0; */
 959 static int cortex_m_step(struct target *target, int current,
 960         target_addr_t address, int handle_breakpoints)
 961 {
 962         struct cortex_m_common *cortex_m = target_to_cm(target);
 963         struct armv7m_common *armv7m = &cortex_m->armv7m;
 964         struct breakpoint *breakpoint = NULL;
 965         struct reg *pc = armv7m->arm.pc;
 966         bool bkpt_inst_found = false;
 967         int retval;
 968         bool isr_timed_out = false;
 969
 970         if (target->state != TARGET_HALTED) {
 971                 LOG_WARNING("target not halted");
 972                 return ERROR_TARGET_NOT_HALTED;
 973         }
 974
 975         /* current = 1: continue on current pc, otherwise continue at <address> */
 976         if (!current) {
 977                 buf_set_u32(pc->value, 0, 32, address);
 978                 pc->dirty = true;
 979                 pc->valid = true;
 980         }
 981
 982         uint32_t pc_value = buf_get_u32(pc->value, 0, 32);
 983
 984         /* the front-end may request us not to handle breakpoints */
 985         if (handle_breakpoints) {
 986                 breakpoint = breakpoint_find(target, pc_value);
 987                 if (breakpoint)
 988                         cortex_m_unset_breakpoint(target, breakpoint);
 989         }
 990
 991         armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found);
 992
 993         target->debug_reason = DBG_REASON_SINGLESTEP;
 994
 995         armv7m_restore_context(target);
 996
 997         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 998
 999         /* if no bkpt instruction is found at pc then we can perform
1000          * a normal step, otherwise we have to manually step over the bkpt
1001          * instruction - as such simulate a step */
1002         if (bkpt_inst_found == false) {
1003                 if (cortex_m->isrmasking_mode != CORTEX_M_ISRMASK_AUTO) {
1004                         /* Automatic ISR masking mode off: Just step over the next
1005                          * instruction, with interrupts on or off as appropriate. */
1006                         cortex_m_set_maskints_for_step(target);
1007                         cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
1008                 } else {
1009                         /* Process interrupts during stepping in a way they don't interfere
1010                          * debugging.
1011                          *
1012                          * Principle:
1013                          *
1014                          * Set a temporary break point at the current pc and let the core run
1015                          * with interrupts enabled. Pending interrupts get served and we run
1016                          * into the breakpoint again afterwards. Then we step over the next
1017                          * instruction with interrupts disabled.
1018                          *
1019                          * If the pending interrupts don't complete within time, we leave the
1020                          * core running. This may happen if the interrupts trigger faster
1021                          * than the core can process them or the handler doesn't return.
1022                          *
1023                          * If no more breakpoints are available we simply do a step with
1024                          * interrupts enabled.
1025                          *
1026                          */
1027
1028                         /* 2012-09-29 ph
1029                          *
1030                          * If a break point is already set on the lower half word then a break point on
1031                          * the upper half word will not break again when the core is restarted. So we
1032                          * just step over the instruction with interrupts disabled.
1033                          *
1034                          * The documentation has no information about this, it was found by observation
1035                          * on STM32F1 and STM32F2. Proper explanation welcome. STM32F0 doesn't seem to
1036                          * suffer from this problem.
1037                          *
1038                          * To add some confusion: pc_value has bit 0 always set, while the breakpoint
1039                          * address has it always cleared. The former is done to indicate thumb mode
1040                          * to gdb.
1041                          *
1042                          */
1043                         if ((pc_value & 0x02) && breakpoint_find(target, pc_value & ~0x03)) {
1044                                 LOG_DEBUG("Stepping over next instruction with interrupts disabled");
1045                                 cortex_m_write_debug_halt_mask(target, C_HALT | C_MASKINTS, 0);
1046                                 cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
1047                                 /* Re-enable interrupts if appropriate */
1048                                 cortex_m_write_debug_halt_mask(target, C_HALT, 0);
1049                                 cortex_m_set_maskints_for_halt(target);
1050                         } else {
1051
1052                                 /* Set a temporary break point */
1053                                 if (breakpoint) {
1054                                         retval = cortex_m_set_breakpoint(target, breakpoint);
1055                                 } else {
1056                                         enum breakpoint_type type = BKPT_HARD;
1057                                         if (cortex_m->fp_rev == 0 && pc_value > 0x1FFFFFFF) {
1058                                                 /* FPB rev.1 cannot handle such addr, try BKPT instr */
1059                                                 type = BKPT_SOFT;
1060                                         }
1061                                         retval = breakpoint_add(target, pc_value, 2, type);
1062                                 }
1063
1064                                 bool tmp_bp_set = (retval == ERROR_OK);
1065
1066                                 /* No more breakpoints left, just do a step */
1067                                 if (!tmp_bp_set) {
1068                                         cortex_m_set_maskints_for_step(target);
1069                                         cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
1070                                         /* Re-enable interrupts if appropriate */
1071                                         cortex_m_write_debug_halt_mask(target, C_HALT, 0);
1072                                         cortex_m_set_maskints_for_halt(target);
1073                                 } else {
1074                                         /* Start the core */
1075                                         LOG_DEBUG("Starting core to serve pending interrupts");
1076                                         int64_t t_start = timeval_ms();
1077                                         cortex_m_set_maskints_for_run(target);
1078                                         cortex_m_write_debug_halt_mask(target, 0, C_HALT | C_STEP);
1079
1080                                         /* Wait for pending handlers to complete or timeout */
1081                                         do {
1082                                                 retval = mem_ap_read_atomic_u32(armv7m->debug_ap,
1083                                                                 DCB_DHCSR,
1084                                                                 &cortex_m->dcb_dhcsr);
1085                                                 if (retval != ERROR_OK) {
1086                                                         target->state = TARGET_UNKNOWN;
1087                                                         return retval;
1088                                                 }
1089                                                 isr_timed_out = ((timeval_ms() - t_start) > 500);
1090                                         } while (!((cortex_m->dcb_dhcsr & S_HALT) || isr_timed_out));
1091
1092                                         /* only remove breakpoint if we created it */
1093                                         if (breakpoint)
1094                                                 cortex_m_unset_breakpoint(target, breakpoint);
1095                                         else {
1096                                                 /* Remove the temporary breakpoint */
1097                                                 breakpoint_remove(target, pc_value);
1098                                         }
1099
1100                                         if (isr_timed_out) {
1101                                                 LOG_DEBUG("Interrupt handlers didn't complete within time, "
1102                                                         "leaving target running");
1103                                         } else {
1104                                                 /* Step over next instruction with interrupts disabled */
1105                                                 cortex_m_set_maskints_for_step(target);
1106                                                 cortex_m_write_debug_halt_mask(target,
1107                                                         C_HALT | C_MASKINTS,
1108                                                         0);
1109                                                 cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
1110                                                 /* Re-enable interrupts if appropriate */
1111                                                 cortex_m_write_debug_halt_mask(target, C_HALT, 0);
1112                                                 cortex_m_set_maskints_for_halt(target);
1113                                         }
1114                                 }
1115                         }
1116                 }
1117         }
1118
1119         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
1120         if (retval != ERROR_OK)
1121                 return retval;
1122
1123         /* registers are now invalid */
1124         register_cache_invalidate(armv7m->arm.core_cache);
1125
1126         if (breakpoint)
1127                 cortex_m_set_breakpoint(target, breakpoint);
1128
1129         if (isr_timed_out) {
1130                 /* Leave the core running. The user has to stop execution manually. */
1131                 target->debug_reason = DBG_REASON_NOTHALTED;
1132                 target->state = TARGET_RUNNING;
1133                 return ERROR_OK;
1134         }
1135
1136         LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
1137                 " nvic_icsr = 0x%" PRIx32,
1138                 cortex_m->dcb_dhcsr, cortex_m->nvic_icsr);
1139
1140         retval = cortex_m_debug_entry(target);
1141         if (retval != ERROR_OK)
1142                 return retval;
1143         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
1144
1145         LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
1146                 " nvic_icsr = 0x%" PRIx32,
1147                 cortex_m->dcb_dhcsr, cortex_m->nvic_icsr);
1148
1149         return ERROR_OK;
1150 }
1151
1152 static int cortex_m_assert_reset(struct target *target)
1153 {
1154         struct cortex_m_common *cortex_m = target_to_cm(target);
1155         struct armv7m_common *armv7m = &cortex_m->armv7m;
1156         enum cortex_m_soft_reset_config reset_config = cortex_m->soft_reset_config;
1157
1158         LOG_DEBUG("target->state: %s",
1159                 target_state_name(target));
1160
1161         enum reset_types jtag_reset_config = jtag_get_reset_config();
1162
1163         if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
1164                 /* allow scripts to override the reset event */
1165
1166                 target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
1167                 register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
1168                 target->state = TARGET_RESET;
1169
1170                 return ERROR_OK;
1171         }
1172
1173         /* some cores support connecting while srst is asserted
1174          * use that mode is it has been configured */
1175
1176         bool srst_asserted = false;
1177
1178         if (!target_was_examined(target)) {
1179                 if (jtag_reset_config & RESET_HAS_SRST) {
1180                         adapter_assert_reset();
1181                         if (target->reset_halt)
1182                                 LOG_ERROR("Target not examined, will not halt after reset!");
1183                         return ERROR_OK;
1184                 } else {
1185                         LOG_ERROR("Target not examined, reset NOT asserted!");
1186                         return ERROR_FAIL;
1187                 }
1188         }
1189
1190         if ((jtag_reset_config & RESET_HAS_SRST) &&
1191             (jtag_reset_config & RESET_SRST_NO_GATING)) {
1192                 adapter_assert_reset();
1193                 srst_asserted = true;
1194         }
1195
1196         /* Enable debug requests */
1197         int retval;
1198         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
1199         /* Store important errors instead of failing and proceed to reset assert */
1200
1201         if (retval != ERROR_OK || !(cortex_m->dcb_dhcsr & C_DEBUGEN))
1202                 retval = cortex_m_write_debug_halt_mask(target, 0, C_HALT | C_STEP | C_MASKINTS);
1203
1204         /* If the processor is sleeping in a WFI or WFE instruction, the
1205          * C_HALT bit must be asserted to regain control */
1206         if (retval == ERROR_OK && (cortex_m->dcb_dhcsr & S_SLEEP))
1207                 retval = cortex_m_write_debug_halt_mask(target, C_HALT, 0);
1208
1209         mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, 0);
1210         /* Ignore less important errors */
1211
1212         if (!target->reset_halt) {
1213                 /* Set/Clear C_MASKINTS in a separate operation */
1214                 cortex_m_set_maskints_for_run(target);
1215
1216                 /* clear any debug flags before resuming */
1217                 cortex_m_clear_halt(target);
1218
1219                 /* clear C_HALT in dhcsr reg */
1220                 cortex_m_write_debug_halt_mask(target, 0, C_HALT);
1221         } else {
1222                 /* Halt in debug on reset; endreset_event() restores DEMCR.
1223                  *
1224                  * REVISIT catching BUSERR presumably helps to defend against
1225                  * bad vector table entries.  Should this include MMERR or
1226                  * other flags too?
1227                  */
1228                 int retval2;
1229                 retval2 = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DEMCR,
1230                                 TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
1231                 if (retval != ERROR_OK || retval2 != ERROR_OK)
1232                         LOG_INFO("AP write error, reset will not halt");
1233         }
1234
1235         if (jtag_reset_config & RESET_HAS_SRST) {
1236                 /* default to asserting srst */
1237                 if (!srst_asserted)
1238                         adapter_assert_reset();
1239
1240                 /* srst is asserted, ignore AP access errors */
1241                 retval = ERROR_OK;
1242         } else {
1243                 /* Use a standard Cortex-M3 software reset mechanism.
1244                  * We default to using VECTRESET as it is supported on all current cores
1245                  * (except Cortex-M0, M0+ and M1 which support SYSRESETREQ only!)
1246                  * This has the disadvantage of not resetting the peripherals, so a
1247                  * reset-init event handler is needed to perform any peripheral resets.
1248                  */
1249                 if (!cortex_m->vectreset_supported
1250                                 && reset_config == CORTEX_M_RESET_VECTRESET) {
1251                         reset_config = CORTEX_M_RESET_SYSRESETREQ;
1252                         LOG_WARNING("VECTRESET is not supported on this Cortex-M core, using SYSRESETREQ instead.");
1253                         LOG_WARNING("Set 'cortex_m reset_config sysresetreq'.");
1254                 }
1255
1256                 LOG_DEBUG("Using Cortex-M %s", (reset_config == CORTEX_M_RESET_SYSRESETREQ)
1257                         ? "SYSRESETREQ" : "VECTRESET");
1258
1259                 if (reset_config == CORTEX_M_RESET_VECTRESET) {
1260                         LOG_WARNING("Only resetting the Cortex-M core, use a reset-init event "
1261                                 "handler to reset any peripherals or configure hardware srst support.");
1262                 }
1263
1264                 int retval3;
1265                 retval3 = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_AIRCR,
1266                                 AIRCR_VECTKEY | ((reset_config == CORTEX_M_RESET_SYSRESETREQ)
1267                                 ? AIRCR_SYSRESETREQ : AIRCR_VECTRESET));
1268                 if (retval3 != ERROR_OK)
1269                         LOG_DEBUG("Ignoring AP write error right after reset");
1270
1271                 retval3 = dap_dp_init_or_reconnect(armv7m->debug_ap->dap);
1272                 if (retval3 != ERROR_OK) {
1273                         LOG_ERROR("DP initialisation failed");
1274                         /* The error return value must not be propagated in this case.
1275                          * SYSRESETREQ or VECTRESET have been possibly triggered
1276                          * so reset processing should continue */
1277                 } else {
1278                         /* I do not know why this is necessary, but it
1279                          * fixes strange effects (step/resume cause NMI
1280                          * after reset) on LM3S6918 -- Michael Schwingen
1281                          */
1282                         uint32_t tmp;
1283                         mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_AIRCR, &tmp);
1284                 }
1285         }
1286
1287         target->state = TARGET_RESET;
1288         jtag_sleep(50000);
1289
1290         register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
1291
1292         /* now return stored error code if any */
1293         if (retval != ERROR_OK)
1294                 return retval;
1295
1296         if (target->reset_halt) {
1297                 retval = target_halt(target);
1298                 if (retval != ERROR_OK)
1299                         return retval;
1300         }
1301
1302         return ERROR_OK;
1303 }
1304
1305 static int cortex_m_deassert_reset(struct target *target)
1306 {
1307         struct armv7m_common *armv7m = &target_to_cm(target)->armv7m;
1308
1309         LOG_DEBUG("target->state: %s",
1310                 target_state_name(target));
1311
1312         /* deassert reset lines */
1313         adapter_deassert_reset();
1314
1315         enum reset_types jtag_reset_config = jtag_get_reset_config();
1316
1317         if ((jtag_reset_config & RESET_HAS_SRST) &&
1318             !(jtag_reset_config & RESET_SRST_NO_GATING) &&
1319                 target_was_examined(target)) {
1320
1321                 int retval = dap_dp_init_or_reconnect(armv7m->debug_ap->dap);
1322                 if (retval != ERROR_OK) {
1323                         LOG_ERROR("DP initialisation failed");
1324                         return retval;
1325                 }
1326         }
1327
1328         return ERROR_OK;
1329 }
1330
1331 int cortex_m_set_breakpoint(struct target *target, struct breakpoint *breakpoint)
1332 {
1333         int retval;
1334         unsigned int fp_num = 0;
1335         struct cortex_m_common *cortex_m = target_to_cm(target);
1336         struct cortex_m_fp_comparator *comparator_list = cortex_m->fp_comparator_list;
1337
1338         if (breakpoint->set) {
1339                 LOG_WARNING("breakpoint (BPID: %" PRIu32 ") already set", breakpoint->unique_id);
1340                 return ERROR_OK;
1341         }
1342
1343         if (breakpoint->type == BKPT_HARD) {
1344                 uint32_t fpcr_value;
1345                 while (comparator_list[fp_num].used && (fp_num < cortex_m->fp_num_code))
1346                         fp_num++;
1347                 if (fp_num >= cortex_m->fp_num_code) {
1348                         LOG_ERROR("Can not find free FPB Comparator!");
1349                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1350                 }
1351                 breakpoint->set = fp_num + 1;
1352                 fpcr_value = breakpoint->address | 1;
1353                 if (cortex_m->fp_rev == 0) {
1354                         if (breakpoint->address > 0x1FFFFFFF) {
1355                                 LOG_ERROR("Cortex-M Flash Patch Breakpoint rev.1 cannot handle HW breakpoint above address 0x1FFFFFFE");
1356                                 return ERROR_FAIL;
1357                         }
1358                         uint32_t hilo;
1359                         hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
1360                         fpcr_value = (fpcr_value & 0x1FFFFFFC) | hilo | 1;
1361                 } else if (cortex_m->fp_rev > 1) {
1362                         LOG_ERROR("Unhandled Cortex-M Flash Patch Breakpoint architecture revision");
1363                         return ERROR_FAIL;
1364                 }
1365                 comparator_list[fp_num].used = true;
1366                 comparator_list[fp_num].fpcr_value = fpcr_value;
1367                 target_write_u32(target, comparator_list[fp_num].fpcr_address,
1368                         comparator_list[fp_num].fpcr_value);
1369                 LOG_DEBUG("fpc_num %i fpcr_value 0x%" PRIx32 "",
1370                         fp_num,
1371                         comparator_list[fp_num].fpcr_value);
1372                 if (!cortex_m->fpb_enabled) {
1373                         LOG_DEBUG("FPB wasn't enabled, do it now");
1374                         retval = cortex_m_enable_fpb(target);
1375                         if (retval != ERROR_OK) {
1376                                 LOG_ERROR("Failed to enable the FPB");
1377                                 return retval;
1378                         }
1379
1380                         cortex_m->fpb_enabled = true;
1381                 }
1382         } else if (breakpoint->type == BKPT_SOFT) {
1383                 uint8_t code[4];
1384
1385                 /* NOTE: on ARMv6-M and ARMv7-M, BKPT(0xab) is used for
1386                  * semihosting; don't use that.  Otherwise the BKPT
1387                  * parameter is arbitrary.
1388                  */
1389                 buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1390                 retval = target_read_memory(target,
1391                                 breakpoint->address & 0xFFFFFFFE,
1392                                 breakpoint->length, 1,
1393                                 breakpoint->orig_instr);
1394                 if (retval != ERROR_OK)
1395                         return retval;
1396                 retval = target_write_memory(target,
1397                                 breakpoint->address & 0xFFFFFFFE,
1398                                 breakpoint->length, 1,
1399                                 code);
1400                 if (retval != ERROR_OK)
1401                         return retval;
1402                 breakpoint->set = true;
1403         }
1404
1405         LOG_DEBUG("BPID: %" PRIu32 ", Type: %d, Address: " TARGET_ADDR_FMT " Length: %d (set=%d)",
1406                 breakpoint->unique_id,
1407                 (int)(breakpoint->type),
1408                 breakpoint->address,
1409                 breakpoint->length,
1410                 breakpoint->set);
1411
1412         return ERROR_OK;
1413 }
1414
1415 int cortex_m_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
1416 {
1417         int retval;
1418         struct cortex_m_common *cortex_m = target_to_cm(target);
1419         struct cortex_m_fp_comparator *comparator_list = cortex_m->fp_comparator_list;
1420
1421         if (breakpoint->set <= 0) {
1422                 LOG_WARNING("breakpoint not set");
1423                 return ERROR_OK;
1424         }
1425
1426         LOG_DEBUG("BPID: %" PRIu32 ", Type: %d, Address: " TARGET_ADDR_FMT " Length: %d (set=%d)",
1427                 breakpoint->unique_id,
1428                 (int)(breakpoint->type),
1429                 breakpoint->address,
1430                 breakpoint->length,
1431                 breakpoint->set);
1432
1433         if (breakpoint->type == BKPT_HARD) {
1434                 unsigned int fp_num = breakpoint->set - 1;
1435                 if (fp_num >= cortex_m->fp_num_code) {
1436                         LOG_DEBUG("Invalid FP Comparator number in breakpoint");
1437                         return ERROR_OK;
1438                 }
1439                 comparator_list[fp_num].used = false;
1440                 comparator_list[fp_num].fpcr_value = 0;
1441                 target_write_u32(target, comparator_list[fp_num].fpcr_address,
1442                         comparator_list[fp_num].fpcr_value);
1443         } else {
1444                 /* restore original instruction (kept in target endianness) */
1445                 retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE,
1446                                         breakpoint->length, 1,
1447                                         breakpoint->orig_instr);
1448                 if (retval != ERROR_OK)
1449                         return retval;
1450         }
1451         breakpoint->set = false;
1452
1453         return ERROR_OK;
1454 }
1455
1456 int cortex_m_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
1457 {
1458         if (breakpoint->length == 3) {
1459                 LOG_DEBUG("Using a two byte breakpoint for 32bit Thumb-2 request");
1460                 breakpoint->length = 2;
1461         }
1462
1463         if ((breakpoint->length != 2)) {
1464                 LOG_INFO("only breakpoints of two bytes length supported");
1465                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1466         }
1467
1468         return cortex_m_set_breakpoint(target, breakpoint);
1469 }
1470
1471 int cortex_m_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
1472 {
1473         if (!breakpoint->set)
1474                 return ERROR_OK;
1475
1476         return cortex_m_unset_breakpoint(target, breakpoint);
1477 }
1478
1479 static int cortex_m_set_watchpoint(struct target *target, struct watchpoint *watchpoint)
1480 {
1481         unsigned int dwt_num = 0;
1482         struct cortex_m_common *cortex_m = target_to_cm(target);
1483
1484         /* REVISIT Don't fully trust these "not used" records ... users
1485          * may set up breakpoints by hand, e.g. dual-address data value
1486          * watchpoint using comparator #1; comparator #0 matching cycle
1487          * count; send data trace info through ITM and TPIU; etc
1488          */
1489         struct cortex_m_dwt_comparator *comparator;
1490
1491         for (comparator = cortex_m->dwt_comparator_list;
1492                 comparator->used && dwt_num < cortex_m->dwt_num_comp;
1493                 comparator++, dwt_num++)
1494                 continue;
1495         if (dwt_num >= cortex_m->dwt_num_comp) {
1496                 LOG_ERROR("Can not find free DWT Comparator");
1497                 return ERROR_FAIL;
1498         }
1499         comparator->used = true;
1500         watchpoint->set = dwt_num + 1;
1501
1502         comparator->comp = watchpoint->address;
1503         target_write_u32(target, comparator->dwt_comparator_address + 0,
1504                 comparator->comp);
1505
1506         if ((cortex_m->dwt_devarch & 0x1FFFFF) != DWT_DEVARCH_ARMV8M) {
1507                 uint32_t mask = 0, temp;
1508
1509                 /* watchpoint params were validated earlier */
1510                 temp = watchpoint->length;
1511                 while (temp) {
1512                         temp >>= 1;
1513                         mask++;
1514                 }
1515                 mask--;
1516
1517                 comparator->mask = mask;
1518                 target_write_u32(target, comparator->dwt_comparator_address + 4,
1519                         comparator->mask);
1520
1521                 switch (watchpoint->rw) {
1522                 case WPT_READ:
1523                         comparator->function = 5;
1524                         break;
1525                 case WPT_WRITE:
1526                         comparator->function = 6;
1527                         break;
1528                 case WPT_ACCESS:
1529                         comparator->function = 7;
1530                         break;
1531                 }
1532         } else {
1533                 uint32_t data_size = watchpoint->length >> 1;
1534                 comparator->mask = (watchpoint->length >> 1) | 1;
1535
1536                 switch (watchpoint->rw) {
1537                 case WPT_ACCESS:
1538                         comparator->function = 4;
1539                         break;
1540                 case WPT_WRITE:
1541                         comparator->function = 5;
1542                         break;
1543                 case WPT_READ:
1544                         comparator->function = 6;
1545                         break;
1546                 }
1547                 comparator->function = comparator->function | (1 << 4) |
1548                                 (data_size << 10);
1549         }
1550
1551         target_write_u32(target, comparator->dwt_comparator_address + 8,
1552                 comparator->function);
1553
1554         LOG_DEBUG("Watchpoint (ID %d) DWT%d 0x%08x 0x%x 0x%05x",
1555                 watchpoint->unique_id, dwt_num,
1556                 (unsigned) comparator->comp,
1557                 (unsigned) comparator->mask,
1558                 (unsigned) comparator->function);
1559         return ERROR_OK;
1560 }
1561
1562 static int cortex_m_unset_watchpoint(struct target *target, struct watchpoint *watchpoint)
1563 {
1564         struct cortex_m_common *cortex_m = target_to_cm(target);
1565         struct cortex_m_dwt_comparator *comparator;
1566
1567         if (watchpoint->set <= 0) {
1568                 LOG_WARNING("watchpoint (wpid: %d) not set",
1569                         watchpoint->unique_id);
1570                 return ERROR_OK;
1571         }
1572
1573         unsigned int dwt_num = watchpoint->set - 1;
1574
1575         LOG_DEBUG("Watchpoint (ID %d) DWT%d address: 0x%08x clear",
1576                 watchpoint->unique_id, dwt_num,
1577                 (unsigned) watchpoint->address);
1578
1579         if (dwt_num >= cortex_m->dwt_num_comp) {
1580                 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1581                 return ERROR_OK;
1582         }
1583
1584         comparator = cortex_m->dwt_comparator_list + dwt_num;
1585         comparator->used = false;
1586         comparator->function = 0;
1587         target_write_u32(target, comparator->dwt_comparator_address + 8,
1588                 comparator->function);
1589
1590         watchpoint->set = false;
1591
1592         return ERROR_OK;
1593 }
1594
1595 int cortex_m_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
1596 {
1597         struct cortex_m_common *cortex_m = target_to_cm(target);
1598
1599         if (cortex_m->dwt_comp_available < 1) {
1600                 LOG_DEBUG("no comparators?");
1601                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1602         }
1603
1604         /* hardware doesn't support data value masking */
1605         if (watchpoint->mask != ~(uint32_t)0) {
1606                 LOG_DEBUG("watchpoint value masks not supported");
1607                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1608         }
1609
1610         /* hardware allows address masks of up to 32K */
1611         unsigned mask;
1612
1613         for (mask = 0; mask < 16; mask++) {
1614                 if ((1u << mask) == watchpoint->length)
1615                         break;
1616         }
1617         if (mask == 16) {
1618                 LOG_DEBUG("unsupported watchpoint length");
1619                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1620         }
1621         if (watchpoint->address & ((1 << mask) - 1)) {
1622                 LOG_DEBUG("watchpoint address is unaligned");
1623                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1624         }
1625
1626         /* Caller doesn't seem to be able to describe watching for data
1627          * values of zero; that flags "no value".
1628          *
1629          * REVISIT This DWT may well be able to watch for specific data
1630          * values.  Requires comparator #1 to set DATAVMATCH and match
1631          * the data, and another comparator (DATAVADDR0) matching addr.
1632          */
1633         if (watchpoint->value) {
1634                 LOG_DEBUG("data value watchpoint not YET supported");
1635                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1636         }
1637
1638         cortex_m->dwt_comp_available--;
1639         LOG_DEBUG("dwt_comp_available: %d", cortex_m->dwt_comp_available);
1640
1641         return ERROR_OK;
1642 }
1643
1644 int cortex_m_remove_watchpoint(struct target *target, struct watchpoint *watchpoint)
1645 {
1646         struct cortex_m_common *cortex_m = target_to_cm(target);
1647
1648         /* REVISIT why check? DWT can be updated with core running ... */
1649         if (target->state != TARGET_HALTED) {
1650                 LOG_WARNING("target not halted");
1651                 return ERROR_TARGET_NOT_HALTED;
1652         }
1653
1654         if (watchpoint->set)
1655                 cortex_m_unset_watchpoint(target, watchpoint);
1656
1657         cortex_m->dwt_comp_available++;
1658         LOG_DEBUG("dwt_comp_available: %d", cortex_m->dwt_comp_available);
1659
1660         return ERROR_OK;
1661 }
1662
1663 int cortex_m_hit_watchpoint(struct target *target, struct watchpoint **hit_watchpoint)
1664 {
1665         if (target->debug_reason != DBG_REASON_WATCHPOINT)
1666                 return ERROR_FAIL;
1667
1668         struct cortex_m_common *cortex_m = target_to_cm(target);
1669
1670         for (struct watchpoint *wp = target->watchpoints; wp; wp = wp->next) {
1671                 if (!wp->set)
1672                         continue;
1673
1674                 unsigned int dwt_num = wp->set - 1;
1675                 struct cortex_m_dwt_comparator *comparator = cortex_m->dwt_comparator_list + dwt_num;
1676
1677                 uint32_t dwt_function;
1678                 int retval = target_read_u32(target, comparator->dwt_comparator_address + 8, &dwt_function);
1679                 if (retval != ERROR_OK)
1680                         return ERROR_FAIL;
1681
1682                 /* check the MATCHED bit */
1683                 if (dwt_function & BIT(24)) {
1684                         *hit_watchpoint = wp;
1685                         return ERROR_OK;
1686                 }
1687         }
1688
1689         return ERROR_FAIL;
1690 }
1691
1692 void cortex_m_enable_watchpoints(struct target *target)
1693 {
1694         struct watchpoint *watchpoint = target->watchpoints;
1695
1696         /* set any pending watchpoints */
1697         while (watchpoint) {
1698                 if (!watchpoint->set)
1699                         cortex_m_set_watchpoint(target, watchpoint);
1700                 watchpoint = watchpoint->next;
1701         }
1702 }
1703
1704 static int cortex_m_read_memory(struct target *target, target_addr_t address,
1705         uint32_t size, uint32_t count, uint8_t *buffer)
1706 {
1707         struct armv7m_common *armv7m = target_to_armv7m(target);
1708
1709         if (armv7m->arm.arch == ARM_ARCH_V6M) {
1710                 /* armv6m does not handle unaligned memory access */
1711                 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
1712                         return ERROR_TARGET_UNALIGNED_ACCESS;
1713         }
1714
1715         return mem_ap_read_buf(armv7m->debug_ap, buffer, size, count, address);
1716 }
1717
1718 static int cortex_m_write_memory(struct target *target, target_addr_t address,
1719         uint32_t size, uint32_t count, const uint8_t *buffer)
1720 {
1721         struct armv7m_common *armv7m = target_to_armv7m(target);
1722
1723         if (armv7m->arm.arch == ARM_ARCH_V6M) {
1724                 /* armv6m does not handle unaligned memory access */
1725                 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
1726                         return ERROR_TARGET_UNALIGNED_ACCESS;
1727         }
1728
1729         return mem_ap_write_buf(armv7m->debug_ap, buffer, size, count, address);
1730 }
1731
1732 static int cortex_m_init_target(struct command_context *cmd_ctx,
1733         struct target *target)
1734 {
1735         armv7m_build_reg_cache(target);
1736         arm_semihosting_init(target);
1737         return ERROR_OK;
1738 }
1739
1740 void cortex_m_deinit_target(struct target *target)
1741 {
1742         struct cortex_m_common *cortex_m = target_to_cm(target);
1743
1744         free(cortex_m->fp_comparator_list);
1745
1746         cortex_m_dwt_free(target);
1747         armv7m_free_reg_cache(target);
1748
1749         free(target->private_config);
1750         free(cortex_m);
1751 }
1752
1753 int cortex_m_profiling(struct target *target, uint32_t *samples,
1754                               uint32_t max_num_samples, uint32_t *num_samples, uint32_t seconds)
1755 {
1756         struct timeval timeout, now;
1757         struct armv7m_common *armv7m = target_to_armv7m(target);
1758         uint32_t reg_value;
1759         int retval;
1760
1761         retval = target_read_u32(target, DWT_PCSR, &reg_value);
1762         if (retval != ERROR_OK) {
1763                 LOG_ERROR("Error while reading PCSR");
1764                 return retval;
1765         }
1766         if (reg_value == 0) {
1767                 LOG_INFO("PCSR sampling not supported on this processor.");
1768                 return target_profiling_default(target, samples, max_num_samples, num_samples, seconds);
1769         }
1770
1771         gettimeofday(&timeout, NULL);
1772         timeval_add_time(&timeout, seconds, 0);
1773
1774         LOG_INFO("Starting Cortex-M profiling. Sampling DWT_PCSR as fast as we can...");
1775
1776         /* Make sure the target is running */
1777         target_poll(target);
1778         if (target->state == TARGET_HALTED)
1779                 retval = target_resume(target, 1, 0, 0, 0);
1780
1781         if (retval != ERROR_OK) {
1782                 LOG_ERROR("Error while resuming target");
1783                 return retval;
1784         }
1785
1786         uint32_t sample_count = 0;
1787
1788         for (;;) {
1789                 if (armv7m && armv7m->debug_ap) {
1790                         uint32_t read_count = max_num_samples - sample_count;
1791                         if (read_count > 1024)
1792                                 read_count = 1024;
1793
1794                         retval = mem_ap_read_buf_noincr(armv7m->debug_ap,
1795                                                 (void *)&samples[sample_count],
1796                                                 4, read_count, DWT_PCSR);
1797                         sample_count += read_count;
1798                 } else {
1799                         target_read_u32(target, DWT_PCSR, &samples[sample_count++]);
1800                 }
1801
1802                 if (retval != ERROR_OK) {
1803                         LOG_ERROR("Error while reading PCSR");
1804                         return retval;
1805                 }
1806
1807
1808                 gettimeofday(&now, NULL);
1809                 if (sample_count >= max_num_samples || timeval_compare(&now, &timeout) > 0) {
1810                         LOG_INFO("Profiling completed. %" PRIu32 " samples.", sample_count);
1811                         break;
1812                 }
1813         }
1814
1815         *num_samples = sample_count;
1816         return retval;
1817 }
1818
1819
1820 /* REVISIT cache valid/dirty bits are unmaintained.  We could set "valid"
1821  * on r/w if the core is not running, and clear on resume or reset ... or
1822  * at least, in a post_restore_context() method.
1823  */
1824
1825 struct dwt_reg_state {
1826         struct target *target;
1827         uint32_t addr;
1828         uint8_t value[4];               /* scratch/cache */
1829 };
1830
1831 static int cortex_m_dwt_get_reg(struct reg *reg)
1832 {
1833         struct dwt_reg_state *state = reg->arch_info;
1834
1835         uint32_t tmp;
1836         int retval = target_read_u32(state->target, state->addr, &tmp);
1837         if (retval != ERROR_OK)
1838                 return retval;
1839
1840         buf_set_u32(state->value, 0, 32, tmp);
1841         return ERROR_OK;
1842 }
1843
1844 static int cortex_m_dwt_set_reg(struct reg *reg, uint8_t *buf)
1845 {
1846         struct dwt_reg_state *state = reg->arch_info;
1847
1848         return target_write_u32(state->target, state->addr,
1849                         buf_get_u32(buf, 0, reg->size));
1850 }
1851
1852 struct dwt_reg {
1853         uint32_t addr;
1854         const char *name;
1855         unsigned size;
1856 };
1857
1858 static const struct dwt_reg dwt_base_regs[] = {
1859         { DWT_CTRL, "dwt_ctrl", 32, },
1860         /* NOTE that Erratum 532314 (fixed r2p0) affects CYCCNT:  it wrongly
1861          * increments while the core is asleep.
1862          */
1863         { DWT_CYCCNT, "dwt_cyccnt", 32, },
1864         /* plus some 8 bit counters, useful for profiling with TPIU */
1865 };
1866
1867 static const struct dwt_reg dwt_comp[] = {
1868 #define DWT_COMPARATOR(i) \
1869                 { DWT_COMP0 + 0x10 * (i), "dwt_" #i "_comp", 32, }, \
1870                 { DWT_MASK0 + 0x10 * (i), "dwt_" #i "_mask", 4, }, \
1871                 { DWT_FUNCTION0 + 0x10 * (i), "dwt_" #i "_function", 32, }
1872         DWT_COMPARATOR(0),
1873         DWT_COMPARATOR(1),
1874         DWT_COMPARATOR(2),
1875         DWT_COMPARATOR(3),
1876         DWT_COMPARATOR(4),
1877         DWT_COMPARATOR(5),
1878         DWT_COMPARATOR(6),
1879         DWT_COMPARATOR(7),
1880         DWT_COMPARATOR(8),
1881         DWT_COMPARATOR(9),
1882         DWT_COMPARATOR(10),
1883         DWT_COMPARATOR(11),
1884         DWT_COMPARATOR(12),
1885         DWT_COMPARATOR(13),
1886         DWT_COMPARATOR(14),
1887         DWT_COMPARATOR(15),
1888 #undef DWT_COMPARATOR
1889 };
1890
1891 static const struct reg_arch_type dwt_reg_type = {
1892         .get = cortex_m_dwt_get_reg,
1893         .set = cortex_m_dwt_set_reg,
1894 };
1895
1896 static void cortex_m_dwt_addreg(struct target *t, struct reg *r, const struct dwt_reg *d)
1897 {
1898         struct dwt_reg_state *state;
1899
1900         state = calloc(1, sizeof(*state));
1901         if (!state)
1902                 return;
1903         state->addr = d->addr;
1904         state->target = t;
1905
1906         r->name = d->name;
1907         r->size = d->size;
1908         r->value = state->value;
1909         r->arch_info = state;
1910         r->type = &dwt_reg_type;
1911 }
1912
1913 static void cortex_m_dwt_setup(struct cortex_m_common *cm, struct target *target)
1914 {
1915         uint32_t dwtcr;
1916         struct reg_cache *cache;
1917         struct cortex_m_dwt_comparator *comparator;
1918         int reg;
1919
1920         target_read_u32(target, DWT_CTRL, &dwtcr);
1921         LOG_DEBUG("DWT_CTRL: 0x%" PRIx32, dwtcr);
1922         if (!dwtcr) {
1923                 LOG_DEBUG("no DWT");
1924                 return;
1925         }
1926
1927         target_read_u32(target, DWT_DEVARCH, &cm->dwt_devarch);
1928         LOG_DEBUG("DWT_DEVARCH: 0x%" PRIx32, cm->dwt_devarch);
1929
1930         cm->dwt_num_comp = (dwtcr >> 28) & 0xF;
1931         cm->dwt_comp_available = cm->dwt_num_comp;
1932         cm->dwt_comparator_list = calloc(cm->dwt_num_comp,
1933                         sizeof(struct cortex_m_dwt_comparator));
1934         if (!cm->dwt_comparator_list) {
1935 fail0:
1936                 cm->dwt_num_comp = 0;
1937                 LOG_ERROR("out of mem");
1938                 return;
1939         }
1940
1941         cache = calloc(1, sizeof(*cache));
1942         if (!cache) {
1943 fail1:
1944                 free(cm->dwt_comparator_list);
1945                 goto fail0;
1946         }
1947         cache->name = "Cortex-M DWT registers";
1948         cache->num_regs = 2 + cm->dwt_num_comp * 3;
1949         cache->reg_list = calloc(cache->num_regs, sizeof(*cache->reg_list));
1950         if (!cache->reg_list) {
1951                 free(cache);
1952                 goto fail1;
1953         }
1954
1955         for (reg = 0; reg < 2; reg++)
1956                 cortex_m_dwt_addreg(target, cache->reg_list + reg,
1957                         dwt_base_regs + reg);
1958
1959         comparator = cm->dwt_comparator_list;
1960         for (unsigned int i = 0; i < cm->dwt_num_comp; i++, comparator++) {
1961                 int j;
1962
1963                 comparator->dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1964                 for (j = 0; j < 3; j++, reg++)
1965                         cortex_m_dwt_addreg(target, cache->reg_list + reg,
1966                                 dwt_comp + 3 * i + j);
1967
1968                 /* make sure we clear any watchpoints enabled on the target */
1969                 target_write_u32(target, comparator->dwt_comparator_address + 8, 0);
1970         }
1971
1972         *register_get_last_cache_p(&target->reg_cache) = cache;
1973         cm->dwt_cache = cache;
1974
1975         LOG_DEBUG("DWT dwtcr 0x%" PRIx32 ", comp %d, watch%s",
1976                 dwtcr, cm->dwt_num_comp,
1977                 (dwtcr & (0xf << 24)) ? " only" : "/trigger");
1978
1979         /* REVISIT:  if num_comp > 1, check whether comparator #1 can
1980          * implement single-address data value watchpoints ... so we
1981          * won't need to check it later, when asked to set one up.
1982          */
1983 }
1984
1985 static void cortex_m_dwt_free(struct target *target)
1986 {
1987         struct cortex_m_common *cm = target_to_cm(target);
1988         struct reg_cache *cache = cm->dwt_cache;
1989
1990         free(cm->dwt_comparator_list);
1991         cm->dwt_comparator_list = NULL;
1992         cm->dwt_num_comp = 0;
1993
1994         if (cache) {
1995                 register_unlink_cache(&target->reg_cache, cache);
1996
1997                 if (cache->reg_list) {
1998                         for (size_t i = 0; i < cache->num_regs; i++)
1999                                 free(cache->reg_list[i].arch_info);
2000                         free(cache->reg_list);
2001                 }
2002                 free(cache);
2003         }
2004         cm->dwt_cache = NULL;
2005 }
2006
2007 #define MVFR0 0xe000ef40
2008 #define MVFR1 0xe000ef44
2009
2010 #define MVFR0_DEFAULT_M4 0x10110021
2011 #define MVFR1_DEFAULT_M4 0x11000011
2012
2013 #define MVFR0_DEFAULT_M7_SP 0x10110021
2014 #define MVFR0_DEFAULT_M7_DP 0x10110221
2015 #define MVFR1_DEFAULT_M7_SP 0x11000011
2016 #define MVFR1_DEFAULT_M7_DP 0x12000011
2017
2018 static int cortex_m_find_mem_ap(struct adiv5_dap *swjdp,
2019                 struct adiv5_ap **debug_ap)
2020 {
2021         if (dap_find_ap(swjdp, AP_TYPE_AHB3_AP, debug_ap) == ERROR_OK)
2022                 return ERROR_OK;
2023
2024         return dap_find_ap(swjdp, AP_TYPE_AHB5_AP, debug_ap);
2025 }
2026
2027 int cortex_m_examine(struct target *target)
2028 {
2029         int retval;
2030         uint32_t cpuid, fpcr, mvfr0, mvfr1;
2031         struct cortex_m_common *cortex_m = target_to_cm(target);
2032         struct adiv5_dap *swjdp = cortex_m->armv7m.arm.dap;
2033         struct armv7m_common *armv7m = target_to_armv7m(target);
2034
2035         /* hla_target shares the examine handler but does not support
2036          * all its calls */
2037         if (!armv7m->is_hla_target) {
2038                 if (cortex_m->apsel == DP_APSEL_INVALID) {
2039                         /* Search for the MEM-AP */
2040                         retval = cortex_m_find_mem_ap(swjdp, &armv7m->debug_ap);
2041                         if (retval != ERROR_OK) {
2042                                 LOG_ERROR("Could not find MEM-AP to control the core");
2043                                 return retval;
2044                         }
2045                 } else {
2046                         armv7m->debug_ap = dap_ap(swjdp, cortex_m->apsel);
2047                 }
2048
2049                 /* Leave (only) generic DAP stuff for debugport_init(); */
2050                 armv7m->debug_ap->memaccess_tck = 8;
2051
2052                 retval = mem_ap_init(armv7m->debug_ap);
2053                 if (retval != ERROR_OK)
2054                         return retval;
2055         }
2056
2057         if (!target_was_examined(target)) {
2058                 target_set_examined(target);
2059
2060                 /* Read from Device Identification Registers */
2061                 retval = target_read_u32(target, CPUID, &cpuid);
2062                 if (retval != ERROR_OK)
2063                         return retval;
2064
2065                 /* Get ARCH and CPU types */
2066                 const enum cortex_m_partno core_partno = (cpuid & ARM_CPUID_PARTNO_MASK) >> ARM_CPUID_PARTNO_POS;
2067
2068                 for (unsigned int n = 0; n < ARRAY_SIZE(cortex_m_parts); n++) {
2069                         if (core_partno == cortex_m_parts[n].partno) {
2070                                 cortex_m->core_info = &cortex_m_parts[n];
2071                                 break;
2072                         }
2073                 }
2074
2075                 if (!cortex_m->core_info) {
2076                         LOG_ERROR("Cortex-M PARTNO 0x%x is unrecognized", core_partno);
2077                         return ERROR_FAIL;
2078                 }
2079
2080                 armv7m->arm.arch = cortex_m->core_info->arch;
2081
2082                 LOG_INFO("%s: %s r%" PRId8 "p%" PRId8 " processor detected",
2083                                 target_name(target),
2084                                 cortex_m->core_info->name,
2085                                 (uint8_t)((cpuid >> 20) & 0xf),
2086                                 (uint8_t)((cpuid >> 0) & 0xf));
2087
2088                 cortex_m->maskints_erratum = false;
2089                 if (core_partno == CORTEX_M7_PARTNO) {
2090                         uint8_t rev, patch;
2091                         rev = (cpuid >> 20) & 0xf;
2092                         patch = (cpuid >> 0) & 0xf;
2093                         if ((rev == 0) && (patch < 2)) {
2094                                 LOG_WARNING("Silicon bug: single stepping may enter pending exception handler!");
2095                                 cortex_m->maskints_erratum = true;
2096                         }
2097                 }
2098                 LOG_DEBUG("cpuid: 0x%8.8" PRIx32 "", cpuid);
2099
2100                 if (cortex_m->core_info->flags & CORTEX_M_F_HAS_FPV4) {
2101                         target_read_u32(target, MVFR0, &mvfr0);
2102                         target_read_u32(target, MVFR1, &mvfr1);
2103
2104                         /* test for floating point feature on Cortex-M4 */
2105                         if ((mvfr0 == MVFR0_DEFAULT_M4) && (mvfr1 == MVFR1_DEFAULT_M4)) {
2106                                 LOG_DEBUG("%s floating point feature FPv4_SP found", cortex_m->core_info->name);
2107                                 armv7m->fp_feature = FPV4_SP;
2108                         }
2109                 } else if (cortex_m->core_info->flags & CORTEX_M_F_HAS_FPV5) {
2110                         target_read_u32(target, MVFR0, &mvfr0);
2111                         target_read_u32(target, MVFR1, &mvfr1);
2112
2113                         /* test for floating point features on Cortex-M7 */
2114                         if ((mvfr0 == MVFR0_DEFAULT_M7_SP) && (mvfr1 == MVFR1_DEFAULT_M7_SP)) {
2115                                 LOG_DEBUG("%s floating point feature FPv5_SP found", cortex_m->core_info->name);
2116                                 armv7m->fp_feature = FPV5_SP;
2117                         } else if ((mvfr0 == MVFR0_DEFAULT_M7_DP) && (mvfr1 == MVFR1_DEFAULT_M7_DP)) {
2118                                 LOG_DEBUG("%s floating point feature FPv5_DP found", cortex_m->core_info->name);
2119                                 armv7m->fp_feature = FPV5_DP;
2120                         }
2121                 }
2122
2123                 /* VECTRESET is supported only on ARMv7-M cores */
2124                 cortex_m->vectreset_supported = armv7m->arm.arch == ARM_ARCH_V7M;
2125
2126                 /* Check for FPU, otherwise mark FPU register as non-existent */
2127                 if (armv7m->fp_feature == FP_NONE)
2128                         for (size_t idx = ARMV7M_FPU_FIRST_REG; idx <= ARMV7M_FPU_LAST_REG; idx++)
2129                                 armv7m->arm.core_cache->reg_list[idx].exist = false;
2130
2131                 if (armv7m->arm.arch != ARM_ARCH_V8M)
2132                         for (size_t idx = ARMV8M_FIRST_REG; idx <= ARMV8M_LAST_REG; idx++)
2133                                 armv7m->arm.core_cache->reg_list[idx].exist = false;
2134
2135                 if (!armv7m->is_hla_target) {
2136                         if (cortex_m->core_info->flags & CORTEX_M_F_TAR_AUTOINCR_BLOCK_4K)
2137                                 /* Cortex-M3/M4 have 4096 bytes autoincrement range,
2138                                  * s. ARM IHI 0031C: MEM-AP 7.2.2 */
2139                                 armv7m->debug_ap->tar_autoincr_block = (1 << 12);
2140                 }
2141
2142                 /* Enable debug requests */
2143                 retval = target_read_u32(target, DCB_DHCSR, &cortex_m->dcb_dhcsr);
2144                 if (retval != ERROR_OK)
2145                         return retval;
2146                 if (!(cortex_m->dcb_dhcsr & C_DEBUGEN)) {
2147                         uint32_t dhcsr = (cortex_m->dcb_dhcsr | C_DEBUGEN) & ~(C_HALT | C_STEP | C_MASKINTS);
2148
2149                         retval = target_write_u32(target, DCB_DHCSR, DBGKEY | (dhcsr & 0x0000FFFFUL));
2150                         if (retval != ERROR_OK)
2151                                 return retval;
2152                         cortex_m->dcb_dhcsr = dhcsr;
2153                 }
2154
2155                 /* Configure trace modules */
2156                 retval = target_write_u32(target, DCB_DEMCR, TRCENA | armv7m->demcr);
2157                 if (retval != ERROR_OK)
2158                         return retval;
2159
2160                 if (armv7m->trace_config.itm_deferred_config)
2161                         armv7m_trace_itm_config(target);
2162
2163                 /* NOTE: FPB and DWT are both optional. */
2164
2165                 /* Setup FPB */
2166                 target_read_u32(target, FP_CTRL, &fpcr);
2167                 /* bits [14:12] and [7:4] */
2168                 cortex_m->fp_num_code = ((fpcr >> 8) & 0x70) | ((fpcr >> 4) & 0xF);
2169                 cortex_m->fp_num_lit = (fpcr >> 8) & 0xF;
2170                 /* Detect flash patch revision, see RM DDI 0403E.b page C1-817.
2171                    Revision is zero base, fp_rev == 1 means Rev.2 ! */
2172                 cortex_m->fp_rev = (fpcr >> 28) & 0xf;
2173                 free(cortex_m->fp_comparator_list);
2174                 cortex_m->fp_comparator_list = calloc(
2175                                 cortex_m->fp_num_code + cortex_m->fp_num_lit,
2176                                 sizeof(struct cortex_m_fp_comparator));
2177                 cortex_m->fpb_enabled = fpcr & 1;
2178                 for (unsigned int i = 0; i < cortex_m->fp_num_code + cortex_m->fp_num_lit; i++) {
2179                         cortex_m->fp_comparator_list[i].type =
2180                                 (i < cortex_m->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
2181                         cortex_m->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
2182
2183                         /* make sure we clear any breakpoints enabled on the target */
2184                         target_write_u32(target, cortex_m->fp_comparator_list[i].fpcr_address, 0);
2185                 }
2186                 LOG_DEBUG("FPB fpcr 0x%" PRIx32 ", numcode %i, numlit %i",
2187                         fpcr,
2188                         cortex_m->fp_num_code,
2189                         cortex_m->fp_num_lit);
2190
2191                 /* Setup DWT */
2192                 cortex_m_dwt_free(target);
2193                 cortex_m_dwt_setup(cortex_m, target);
2194
2195                 /* These hardware breakpoints only work for code in flash! */
2196                 LOG_INFO("%s: target has %d breakpoints, %d watchpoints",
2197                         target_name(target),
2198                         cortex_m->fp_num_code,
2199                         cortex_m->dwt_num_comp);
2200         }
2201
2202         return ERROR_OK;
2203 }
2204
2205 static int cortex_m_dcc_read(struct target *target, uint8_t *value, uint8_t *ctrl)
2206 {
2207         struct armv7m_common *armv7m = target_to_armv7m(target);
2208         uint16_t dcrdr;
2209         uint8_t buf[2];
2210         int retval;
2211
2212         retval = mem_ap_read_buf_noincr(armv7m->debug_ap, buf, 2, 1, DCB_DCRDR);
2213         if (retval != ERROR_OK)
2214                 return retval;
2215
2216         dcrdr = target_buffer_get_u16(target, buf);
2217         *ctrl = (uint8_t)dcrdr;
2218         *value = (uint8_t)(dcrdr >> 8);
2219
2220         LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
2221
2222         /* write ack back to software dcc register
2223          * signify we have read data */
2224         if (dcrdr & (1 << 0)) {
2225                 target_buffer_set_u16(target, buf, 0);
2226                 retval = mem_ap_write_buf_noincr(armv7m->debug_ap, buf, 2, 1, DCB_DCRDR);
2227                 if (retval != ERROR_OK)
2228                         return retval;
2229         }
2230
2231         return ERROR_OK;
2232 }
2233
2234 static int cortex_m_target_request_data(struct target *target,
2235         uint32_t size, uint8_t *buffer)
2236 {
2237         uint8_t data;
2238         uint8_t ctrl;
2239         uint32_t i;
2240
2241         for (i = 0; i < (size * 4); i++) {
2242                 int retval = cortex_m_dcc_read(target, &data, &ctrl);
2243                 if (retval != ERROR_OK)
2244                         return retval;
2245                 buffer[i] = data;
2246         }
2247
2248         return ERROR_OK;
2249 }
2250
2251 static int cortex_m_handle_target_request(void *priv)
2252 {
2253         struct target *target = priv;
2254         if (!target_was_examined(target))
2255                 return ERROR_OK;
2256
2257         if (!target->dbg_msg_enabled)
2258                 return ERROR_OK;
2259
2260         if (target->state == TARGET_RUNNING) {
2261                 uint8_t data;
2262                 uint8_t ctrl;
2263                 int retval;
2264
2265                 retval = cortex_m_dcc_read(target, &data, &ctrl);
2266                 if (retval != ERROR_OK)
2267                         return retval;
2268
2269                 /* check if we have data */
2270                 if (ctrl & (1 << 0)) {
2271                         uint32_t request;
2272
2273                         /* we assume target is quick enough */
2274                         request = data;
2275                         for (int i = 1; i <= 3; i++) {
2276                                 retval = cortex_m_dcc_read(target, &data, &ctrl);
2277                                 if (retval != ERROR_OK)
2278                                         return retval;
2279                                 request |= ((uint32_t)data << (i * 8));
2280                         }
2281                         target_request(target, request);
2282                 }
2283         }
2284
2285         return ERROR_OK;
2286 }
2287
2288 static int cortex_m_init_arch_info(struct target *target,
2289         struct cortex_m_common *cortex_m, struct adiv5_dap *dap)
2290 {
2291         struct armv7m_common *armv7m = &cortex_m->armv7m;
2292
2293         armv7m_init_arch_info(target, armv7m);
2294
2295         /* default reset mode is to use srst if fitted
2296          * if not it will use CORTEX_M3_RESET_VECTRESET */
2297         cortex_m->soft_reset_config = CORTEX_M_RESET_VECTRESET;
2298
2299         armv7m->arm.dap = dap;
2300
2301         /* register arch-specific functions */
2302         armv7m->examine_debug_reason = cortex_m_examine_debug_reason;
2303
2304         armv7m->post_debug_entry = NULL;
2305
2306         armv7m->pre_restore_context = NULL;
2307
2308         armv7m->load_core_reg_u32 = cortex_m_load_core_reg_u32;
2309         armv7m->store_core_reg_u32 = cortex_m_store_core_reg_u32;
2310
2311         target_register_timer_callback(cortex_m_handle_target_request, 1,
2312                 TARGET_TIMER_TYPE_PERIODIC, target);
2313
2314         return ERROR_OK;
2315 }
2316
2317 static int cortex_m_target_create(struct target *target, Jim_Interp *interp)
2318 {
2319         struct adiv5_private_config *pc;
2320
2321         pc = (struct adiv5_private_config *)target->private_config;
2322         if (adiv5_verify_config(pc) != ERROR_OK)
2323                 return ERROR_FAIL;
2324
2325         struct cortex_m_common *cortex_m = calloc(1, sizeof(struct cortex_m_common));
2326         if (!cortex_m) {
2327                 LOG_ERROR("No memory creating target");
2328                 return ERROR_FAIL;
2329         }
2330
2331         cortex_m->common_magic = CORTEX_M_COMMON_MAGIC;
2332         cortex_m->apsel = pc->ap_num;
2333
2334         cortex_m_init_arch_info(target, cortex_m, pc->dap);
2335
2336         return ERROR_OK;
2337 }
2338
2339 /*--------------------------------------------------------------------------*/
2340
2341 static int cortex_m_verify_pointer(struct command_invocation *cmd,
2342         struct cortex_m_common *cm)
2343 {
2344         if (cm->common_magic != CORTEX_M_COMMON_MAGIC) {
2345                 command_print(cmd, "target is not a Cortex-M");
2346                 return ERROR_TARGET_INVALID;
2347         }
2348         return ERROR_OK;
2349 }
2350
2351 /*
2352  * Only stuff below this line should need to verify that its target
2353  * is a Cortex-M3.  Everything else should have indirected through the
2354  * cortexm3_target structure, which is only used with CM3 targets.
2355  */
2356
2357 COMMAND_HANDLER(handle_cortex_m_vector_catch_command)
2358 {
2359         struct target *target = get_current_target(CMD_CTX);
2360         struct cortex_m_common *cortex_m = target_to_cm(target);
2361         struct armv7m_common *armv7m = &cortex_m->armv7m;
2362         uint32_t demcr = 0;
2363         int retval;
2364
2365         static const struct {
2366                 char name[10];
2367                 unsigned mask;
2368         } vec_ids[] = {
2369                 { "hard_err",   VC_HARDERR, },
2370                 { "int_err",    VC_INTERR, },
2371                 { "bus_err",    VC_BUSERR, },
2372                 { "state_err",  VC_STATERR, },
2373                 { "chk_err",    VC_CHKERR, },
2374                 { "nocp_err",   VC_NOCPERR, },
2375                 { "mm_err",     VC_MMERR, },
2376                 { "reset",      VC_CORERESET, },
2377         };
2378
2379         retval = cortex_m_verify_pointer(CMD, cortex_m);
2380         if (retval != ERROR_OK)
2381                 return retval;
2382
2383         if (!target_was_examined(target)) {
2384                 LOG_ERROR("Target not examined yet");
2385                 return ERROR_FAIL;
2386         }
2387
2388         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &demcr);
2389         if (retval != ERROR_OK)
2390                 return retval;
2391
2392         if (CMD_ARGC > 0) {
2393                 unsigned catch = 0;
2394
2395                 if (CMD_ARGC == 1) {
2396                         if (strcmp(CMD_ARGV[0], "all") == 0) {
2397                                 catch = VC_HARDERR | VC_INTERR | VC_BUSERR
2398                                         | VC_STATERR | VC_CHKERR | VC_NOCPERR
2399                                         | VC_MMERR | VC_CORERESET;
2400                                 goto write;
2401                         } else if (strcmp(CMD_ARGV[0], "none") == 0)
2402                                 goto write;
2403                 }
2404                 while (CMD_ARGC-- > 0) {
2405                         unsigned i;
2406                         for (i = 0; i < ARRAY_SIZE(vec_ids); i++) {
2407                                 if (strcmp(CMD_ARGV[CMD_ARGC], vec_ids[i].name) != 0)
2408                                         continue;
2409                                 catch |= vec_ids[i].mask;
2410                                 break;
2411                         }
2412                         if (i == ARRAY_SIZE(vec_ids)) {
2413                                 LOG_ERROR("No CM3 vector '%s'", CMD_ARGV[CMD_ARGC]);
2414                                 return ERROR_COMMAND_SYNTAX_ERROR;
2415                         }
2416                 }
2417 write:
2418                 /* For now, armv7m->demcr only stores vector catch flags. */
2419                 armv7m->demcr = catch;
2420
2421                 demcr &= ~0xffff;
2422                 demcr |= catch;
2423
2424                 /* write, but don't assume it stuck (why not??) */
2425                 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR, demcr);
2426                 if (retval != ERROR_OK)
2427                         return retval;
2428                 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &demcr);
2429                 if (retval != ERROR_OK)
2430                         return retval;
2431
2432                 /* FIXME be sure to clear DEMCR on clean server shutdown.
2433                  * Otherwise the vector catch hardware could fire when there's
2434                  * no debugger hooked up, causing much confusion...
2435                  */
2436         }
2437
2438         for (unsigned i = 0; i < ARRAY_SIZE(vec_ids); i++) {
2439                 command_print(CMD, "%9s: %s", vec_ids[i].name,
2440                         (demcr & vec_ids[i].mask) ? "catch" : "ignore");
2441         }
2442
2443         return ERROR_OK;
2444 }
2445
2446 COMMAND_HANDLER(handle_cortex_m_mask_interrupts_command)
2447 {
2448         struct target *target = get_current_target(CMD_CTX);
2449         struct cortex_m_common *cortex_m = target_to_cm(target);
2450         int retval;
2451
2452         static const struct jim_nvp nvp_maskisr_modes[] = {
2453                 { .name = "auto", .value = CORTEX_M_ISRMASK_AUTO },
2454                 { .name = "off", .value = CORTEX_M_ISRMASK_OFF },
2455                 { .name = "on", .value = CORTEX_M_ISRMASK_ON },
2456                 { .name = "steponly", .value = CORTEX_M_ISRMASK_STEPONLY },
2457                 { .name = NULL, .value = -1 },
2458         };
2459         const struct jim_nvp *n;
2460
2461
2462         retval = cortex_m_verify_pointer(CMD, cortex_m);
2463         if (retval != ERROR_OK)
2464                 return retval;
2465
2466         if (target->state != TARGET_HALTED) {
2467                 command_print(CMD, "target must be stopped for \"%s\" command", CMD_NAME);
2468                 return ERROR_OK;
2469         }
2470
2471         if (CMD_ARGC > 0) {
2472                 n = jim_nvp_name2value_simple(nvp_maskisr_modes, CMD_ARGV[0]);
2473                 if (!n->name)
2474                         return ERROR_COMMAND_SYNTAX_ERROR;
2475                 cortex_m->isrmasking_mode = n->value;
2476                 cortex_m_set_maskints_for_halt(target);
2477         }
2478
2479         n = jim_nvp_value2name_simple(nvp_maskisr_modes, cortex_m->isrmasking_mode);
2480         command_print(CMD, "cortex_m interrupt mask %s", n->name);
2481
2482         return ERROR_OK;
2483 }
2484
2485 COMMAND_HANDLER(handle_cortex_m_reset_config_command)
2486 {
2487         struct target *target = get_current_target(CMD_CTX);
2488         struct cortex_m_common *cortex_m = target_to_cm(target);
2489         int retval;
2490         char *reset_config;
2491
2492         retval = cortex_m_verify_pointer(CMD, cortex_m);
2493         if (retval != ERROR_OK)
2494                 return retval;
2495
2496         if (CMD_ARGC > 0) {
2497                 if (strcmp(*CMD_ARGV, "sysresetreq") == 0)
2498                         cortex_m->soft_reset_config = CORTEX_M_RESET_SYSRESETREQ;
2499
2500                 else if (strcmp(*CMD_ARGV, "vectreset") == 0) {
2501                         if (target_was_examined(target)
2502                                         && !cortex_m->vectreset_supported)
2503                                 LOG_WARNING("VECTRESET is not supported on your Cortex-M core!");
2504                         else
2505                                 cortex_m->soft_reset_config = CORTEX_M_RESET_VECTRESET;
2506
2507                 } else
2508                         return ERROR_COMMAND_SYNTAX_ERROR;
2509         }
2510
2511         switch (cortex_m->soft_reset_config) {
2512                 case CORTEX_M_RESET_SYSRESETREQ:
2513                         reset_config = "sysresetreq";
2514                         break;
2515
2516                 case CORTEX_M_RESET_VECTRESET:
2517                         reset_config = "vectreset";
2518                         break;
2519
2520                 default:
2521                         reset_config = "unknown";
2522                         break;
2523         }
2524
2525         command_print(CMD, "cortex_m reset_config %s", reset_config);
2526
2527         return ERROR_OK;
2528 }
2529
2530 static const struct command_registration cortex_m_exec_command_handlers[] = {
2531         {
2532                 .name = "maskisr",
2533                 .handler = handle_cortex_m_mask_interrupts_command,
2534                 .mode = COMMAND_EXEC,
2535                 .help = "mask cortex_m interrupts",
2536                 .usage = "['auto'|'on'|'off'|'steponly']",
2537         },
2538         {
2539                 .name = "vector_catch",
2540                 .handler = handle_cortex_m_vector_catch_command,
2541                 .mode = COMMAND_EXEC,
2542                 .help = "configure hardware vectors to trigger debug entry",
2543                 .usage = "['all'|'none'|('bus_err'|'chk_err'|...)*]",
2544         },
2545         {
2546                 .name = "reset_config",
2547                 .handler = handle_cortex_m_reset_config_command,
2548                 .mode = COMMAND_ANY,
2549                 .help = "configure software reset handling",
2550                 .usage = "['sysresetreq'|'vectreset']",
2551         },
2552         COMMAND_REGISTRATION_DONE
2553 };
2554 static const struct command_registration cortex_m_command_handlers[] = {
2555         {
2556                 .chain = armv7m_command_handlers,
2557         },
2558         {
2559                 .chain = armv7m_trace_command_handlers,
2560         },
2561         /* START_DEPRECATED_TPIU */
2562         {
2563                 .chain = arm_tpiu_deprecated_command_handlers,
2564         },
2565         /* END_DEPRECATED_TPIU */
2566         {
2567                 .name = "cortex_m",
2568                 .mode = COMMAND_EXEC,
2569                 .help = "Cortex-M command group",
2570                 .usage = "",
2571                 .chain = cortex_m_exec_command_handlers,
2572         },
2573         {
2574                 .chain = rtt_target_command_handlers,
2575         },
2576         COMMAND_REGISTRATION_DONE
2577 };
2578
2579 struct target_type cortexm_target = {
2580         .name = "cortex_m",
2581
2582         .poll = cortex_m_poll,
2583         .arch_state = armv7m_arch_state,
2584
2585         .target_request_data = cortex_m_target_request_data,
2586
2587         .halt = cortex_m_halt,
2588         .resume = cortex_m_resume,
2589         .step = cortex_m_step,
2590
2591         .assert_reset = cortex_m_assert_reset,
2592         .deassert_reset = cortex_m_deassert_reset,
2593         .soft_reset_halt = cortex_m_soft_reset_halt,
2594
2595         .get_gdb_arch = arm_get_gdb_arch,
2596         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
2597
2598         .read_memory = cortex_m_read_memory,
2599         .write_memory = cortex_m_write_memory,
2600         .checksum_memory = armv7m_checksum_memory,
2601         .blank_check_memory = armv7m_blank_check_memory,
2602
2603         .run_algorithm = armv7m_run_algorithm,
2604         .start_algorithm = armv7m_start_algorithm,
2605         .wait_algorithm = armv7m_wait_algorithm,
2606
2607         .add_breakpoint = cortex_m_add_breakpoint,
2608         .remove_breakpoint = cortex_m_remove_breakpoint,
2609         .add_watchpoint = cortex_m_add_watchpoint,
2610         .remove_watchpoint = cortex_m_remove_watchpoint,
2611         .hit_watchpoint = cortex_m_hit_watchpoint,
2612
2613         .commands = cortex_m_command_handlers,
2614         .target_create = cortex_m_target_create,
2615         .target_jim_configure = adiv5_jim_configure,
2616         .init_target = cortex_m_init_target,
2617         .examine = cortex_m_examine,
2618         .deinit_target = cortex_m_deinit_target,
2619
2620         .profiling = cortex_m_profiling,
2621 };