git.sur5r.net Git - openocd/blob - src/target/cortex_m.c

   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_disassembler.h"
  38 #include "register.h"
  39 #include "arm_opcodes.h"
  40 #include "arm_semihosting.h"
  41 #include <helper/time_support.h>
  42
  43 /* NOTE:  most of this should work fine for the Cortex-M1 and
  44  * Cortex-M0 cores too, although they're ARMv6-M not ARMv7-M.
  45  * Some differences:  M0/M1 doesn't have FBP remapping or the
  46  * DWT tracing/profiling support.  (So the cycle counter will
  47  * not be usable; the other stuff isn't currently used here.)
  48  *
  49  * Although there are some workarounds for errata seen only in r0p0
  50  * silicon, such old parts are hard to find and thus not much tested
  51  * any longer.
  52  */
  53
  54 /* forward declarations */
  55 static int cortex_m_store_core_reg_u32(struct target *target,
  56                 uint32_t num, uint32_t value);
  57 static void cortex_m_dwt_free(struct target *target);
  58
  59 static int cortexm_dap_read_coreregister_u32(struct target *target,
  60         uint32_t *value, int regnum)
  61 {
  62         struct armv7m_common *armv7m = target_to_armv7m(target);
  63         int retval;
  64         uint32_t dcrdr;
  65
  66         /* because the DCB_DCRDR is used for the emulated dcc channel
  67          * we have to save/restore the DCB_DCRDR when used */
  68         if (target->dbg_msg_enabled) {
  69                 retval = mem_ap_read_u32(armv7m->debug_ap, DCB_DCRDR, &dcrdr);
  70                 if (retval != ERROR_OK)
  71                         return retval;
  72         }
  73
  74         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRSR, regnum);
  75         if (retval != ERROR_OK)
  76                 return retval;
  77
  78         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DCRDR, value);
  79         if (retval != ERROR_OK)
  80                 return retval;
  81
  82         if (target->dbg_msg_enabled) {
  83                 /* restore DCB_DCRDR - this needs to be in a separate
  84                  * transaction otherwise the emulated DCC channel breaks */
  85                 if (retval == ERROR_OK)
  86                         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRDR, dcrdr);
  87         }
  88
  89         return retval;
  90 }
  91
  92 static int cortexm_dap_write_coreregister_u32(struct target *target,
  93         uint32_t value, int regnum)
  94 {
  95         struct armv7m_common *armv7m = target_to_armv7m(target);
  96         int retval;
  97         uint32_t dcrdr;
  98
  99         /* because the DCB_DCRDR is used for the emulated dcc channel
 100          * we have to save/restore the DCB_DCRDR when used */
 101         if (target->dbg_msg_enabled) {
 102                 retval = mem_ap_read_u32(armv7m->debug_ap, DCB_DCRDR, &dcrdr);
 103                 if (retval != ERROR_OK)
 104                         return retval;
 105         }
 106
 107         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, value);
 108         if (retval != ERROR_OK)
 109                 return retval;
 110
 111         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRSR, regnum | DCRSR_WnR);
 112         if (retval != ERROR_OK)
 113                 return retval;
 114
 115         if (target->dbg_msg_enabled) {
 116                 /* restore DCB_DCRDR - this needs to be in a seperate
 117                  * transaction otherwise the emulated DCC channel breaks */
 118                 if (retval == ERROR_OK)
 119                         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DCRDR, dcrdr);
 120         }
 121
 122         return retval;
 123 }
 124
 125 static int cortex_m_write_debug_halt_mask(struct target *target,
 126         uint32_t mask_on, uint32_t mask_off)
 127 {
 128         struct cortex_m_common *cortex_m = target_to_cm(target);
 129         struct armv7m_common *armv7m = &cortex_m->armv7m;
 130
 131         /* mask off status bits */
 132         cortex_m->dcb_dhcsr &= ~((0xFFFF << 16) | mask_off);
 133         /* create new register mask */
 134         cortex_m->dcb_dhcsr |= DBGKEY | C_DEBUGEN | mask_on;
 135
 136         return mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DHCSR, cortex_m->dcb_dhcsr);
 137 }
 138
 139 static int cortex_m_clear_halt(struct target *target)
 140 {
 141         struct cortex_m_common *cortex_m = target_to_cm(target);
 142         struct armv7m_common *armv7m = &cortex_m->armv7m;
 143         int retval;
 144
 145         /* clear step if any */
 146         cortex_m_write_debug_halt_mask(target, C_HALT, C_STEP);
 147
 148         /* Read Debug Fault Status Register */
 149         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_DFSR, &cortex_m->nvic_dfsr);
 150         if (retval != ERROR_OK)
 151                 return retval;
 152
 153         /* Clear Debug Fault Status */
 154         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_DFSR, cortex_m->nvic_dfsr);
 155         if (retval != ERROR_OK)
 156                 return retval;
 157         LOG_DEBUG(" NVIC_DFSR 0x%" PRIx32 "", cortex_m->nvic_dfsr);
 158
 159         return ERROR_OK;
 160 }
 161
 162 static int cortex_m_single_step_core(struct target *target)
 163 {
 164         struct cortex_m_common *cortex_m = target_to_cm(target);
 165         struct armv7m_common *armv7m = &cortex_m->armv7m;
 166         int retval;
 167
 168         /* Mask interrupts before clearing halt, if done already.  This avoids
 169          * Erratum 377497 (fixed in r1p0) where setting MASKINTS while clearing
 170          * HALT can put the core into an unknown state.
 171          */
 172         if (!(cortex_m->dcb_dhcsr & C_MASKINTS)) {
 173                 retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DHCSR,
 174                                 DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN);
 175                 if (retval != ERROR_OK)
 176                         return retval;
 177         }
 178         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DHCSR,
 179                         DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN);
 180         if (retval != ERROR_OK)
 181                 return retval;
 182         LOG_DEBUG(" ");
 183
 184         /* restore dhcsr reg */
 185         cortex_m_clear_halt(target);
 186
 187         return ERROR_OK;
 188 }
 189
 190 static int cortex_m_enable_fpb(struct target *target)
 191 {
 192         int retval = target_write_u32(target, FP_CTRL, 3);
 193         if (retval != ERROR_OK)
 194                 return retval;
 195
 196         /* check the fpb is actually enabled */
 197         uint32_t fpctrl;
 198         retval = target_read_u32(target, FP_CTRL, &fpctrl);
 199         if (retval != ERROR_OK)
 200                 return retval;
 201
 202         if (fpctrl & 1)
 203                 return ERROR_OK;
 204
 205         return ERROR_FAIL;
 206 }
 207
 208 static int cortex_m_endreset_event(struct target *target)
 209 {
 210         int i;
 211         int retval;
 212         uint32_t dcb_demcr;
 213         struct cortex_m_common *cortex_m = target_to_cm(target);
 214         struct armv7m_common *armv7m = &cortex_m->armv7m;
 215         struct adiv5_dap *swjdp = cortex_m->armv7m.arm.dap;
 216         struct cortex_m_fp_comparator *fp_list = cortex_m->fp_comparator_list;
 217         struct cortex_m_dwt_comparator *dwt_list = cortex_m->dwt_comparator_list;
 218
 219         /* REVISIT The four debug monitor bits are currently ignored... */
 220         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &dcb_demcr);
 221         if (retval != ERROR_OK)
 222                 return retval;
 223         LOG_DEBUG("DCB_DEMCR = 0x%8.8" PRIx32 "", dcb_demcr);
 224
 225         /* this register is used for emulated dcc channel */
 226         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, 0);
 227         if (retval != ERROR_OK)
 228                 return retval;
 229
 230         /* Enable debug requests */
 231         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 232         if (retval != ERROR_OK)
 233                 return retval;
 234         if (!(cortex_m->dcb_dhcsr & C_DEBUGEN)) {
 235                 retval = cortex_m_write_debug_halt_mask(target, 0, C_HALT | C_STEP | C_MASKINTS);
 236                 if (retval != ERROR_OK)
 237                         return retval;
 238         }
 239
 240         /* clear any interrupt masking */
 241         cortex_m_write_debug_halt_mask(target, 0, C_MASKINTS);
 242
 243         /* Enable features controlled by ITM and DWT blocks, and catch only
 244          * the vectors we were told to pay attention to.
 245          *
 246          * Target firmware is responsible for all fault handling policy
 247          * choices *EXCEPT* explicitly scripted overrides like "vector_catch"
 248          * or manual updates to the NVIC SHCSR and CCR registers.
 249          */
 250         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR, TRCENA | armv7m->demcr);
 251         if (retval != ERROR_OK)
 252                 return retval;
 253
 254         /* Paranoia: evidently some (early?) chips don't preserve all the
 255          * debug state (including FBP, DWT, etc) across reset...
 256          */
 257
 258         /* Enable FPB */
 259         retval = cortex_m_enable_fpb(target);
 260         if (retval != ERROR_OK) {
 261                 LOG_ERROR("Failed to enable the FPB");
 262                 return retval;
 263         }
 264
 265         cortex_m->fpb_enabled = 1;
 266
 267         /* Restore FPB registers */
 268         for (i = 0; i < cortex_m->fp_num_code + cortex_m->fp_num_lit; i++) {
 269                 retval = target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
 270                 if (retval != ERROR_OK)
 271                         return retval;
 272         }
 273
 274         /* Restore DWT registers */
 275         for (i = 0; i < cortex_m->dwt_num_comp; i++) {
 276                 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 0,
 277                                 dwt_list[i].comp);
 278                 if (retval != ERROR_OK)
 279                         return retval;
 280                 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 4,
 281                                 dwt_list[i].mask);
 282                 if (retval != ERROR_OK)
 283                         return retval;
 284                 retval = target_write_u32(target, dwt_list[i].dwt_comparator_address + 8,
 285                                 dwt_list[i].function);
 286                 if (retval != ERROR_OK)
 287                         return retval;
 288         }
 289         retval = dap_run(swjdp);
 290         if (retval != ERROR_OK)
 291                 return retval;
 292
 293         register_cache_invalidate(armv7m->arm.core_cache);
 294
 295         /* make sure we have latest dhcsr flags */
 296         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 297
 298         return retval;
 299 }
 300
 301 static int cortex_m_examine_debug_reason(struct target *target)
 302 {
 303         struct cortex_m_common *cortex_m = target_to_cm(target);
 304
 305         /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason
 306          * only check the debug reason if we don't know it already */
 307
 308         if ((target->debug_reason != DBG_REASON_DBGRQ)
 309                 && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
 310                 if (cortex_m->nvic_dfsr & DFSR_BKPT) {
 311                         target->debug_reason = DBG_REASON_BREAKPOINT;
 312                         if (cortex_m->nvic_dfsr & DFSR_DWTTRAP)
 313                                 target->debug_reason = DBG_REASON_WPTANDBKPT;
 314                 } else if (cortex_m->nvic_dfsr & DFSR_DWTTRAP)
 315                         target->debug_reason = DBG_REASON_WATCHPOINT;
 316                 else if (cortex_m->nvic_dfsr & DFSR_VCATCH)
 317                         target->debug_reason = DBG_REASON_BREAKPOINT;
 318                 else    /* EXTERNAL, HALTED */
 319                         target->debug_reason = DBG_REASON_UNDEFINED;
 320         }
 321
 322         return ERROR_OK;
 323 }
 324
 325 static int cortex_m_examine_exception_reason(struct target *target)
 326 {
 327         uint32_t shcsr = 0, except_sr = 0, cfsr = -1, except_ar = -1;
 328         struct armv7m_common *armv7m = target_to_armv7m(target);
 329         struct adiv5_dap *swjdp = armv7m->arm.dap;
 330         int retval;
 331
 332         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_SHCSR, &shcsr);
 333         if (retval != ERROR_OK)
 334                 return retval;
 335         switch (armv7m->exception_number) {
 336                 case 2: /* NMI */
 337                         break;
 338                 case 3: /* Hard Fault */
 339                         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_HFSR, &except_sr);
 340                         if (retval != ERROR_OK)
 341                                 return retval;
 342                         if (except_sr & 0x40000000) {
 343                                 retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &cfsr);
 344                                 if (retval != ERROR_OK)
 345                                         return retval;
 346                         }
 347                         break;
 348                 case 4: /* Memory Management */
 349                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
 350                         if (retval != ERROR_OK)
 351                                 return retval;
 352                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_MMFAR, &except_ar);
 353                         if (retval != ERROR_OK)
 354                                 return retval;
 355                         break;
 356                 case 5: /* Bus Fault */
 357                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
 358                         if (retval != ERROR_OK)
 359                                 return retval;
 360                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_BFAR, &except_ar);
 361                         if (retval != ERROR_OK)
 362                                 return retval;
 363                         break;
 364                 case 6: /* Usage Fault */
 365                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_CFSR, &except_sr);
 366                         if (retval != ERROR_OK)
 367                                 return retval;
 368                         break;
 369                 case 11:        /* SVCall */
 370                         break;
 371                 case 12:        /* Debug Monitor */
 372                         retval = mem_ap_read_u32(armv7m->debug_ap, NVIC_DFSR, &except_sr);
 373                         if (retval != ERROR_OK)
 374                                 return retval;
 375                         break;
 376                 case 14:        /* PendSV */
 377                         break;
 378                 case 15:        /* SysTick */
 379                         break;
 380                 default:
 381                         except_sr = 0;
 382                         break;
 383         }
 384         retval = dap_run(swjdp);
 385         if (retval == ERROR_OK)
 386                 LOG_DEBUG("%s SHCSR 0x%" PRIx32 ", SR 0x%" PRIx32
 387                         ", CFSR 0x%" PRIx32 ", AR 0x%" PRIx32,
 388                         armv7m_exception_string(armv7m->exception_number),
 389                         shcsr, except_sr, cfsr, except_ar);
 390         return retval;
 391 }
 392
 393 static int cortex_m_debug_entry(struct target *target)
 394 {
 395         int i;
 396         uint32_t xPSR;
 397         int retval;
 398         struct cortex_m_common *cortex_m = target_to_cm(target);
 399         struct armv7m_common *armv7m = &cortex_m->armv7m;
 400         struct arm *arm = &armv7m->arm;
 401         struct reg *r;
 402
 403         LOG_DEBUG(" ");
 404
 405         cortex_m_clear_halt(target);
 406         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 407         if (retval != ERROR_OK)
 408                 return retval;
 409
 410         retval = armv7m->examine_debug_reason(target);
 411         if (retval != ERROR_OK)
 412                 return retval;
 413
 414         /* Examine target state and mode
 415          * First load register accessible through core debug port */
 416         int num_regs = arm->core_cache->num_regs;
 417
 418         for (i = 0; i < num_regs; i++) {
 419                 r = &armv7m->arm.core_cache->reg_list[i];
 420                 if (!r->valid)
 421                         arm->read_core_reg(target, r, i, ARM_MODE_ANY);
 422         }
 423
 424         r = arm->cpsr;
 425         xPSR = buf_get_u32(r->value, 0, 32);
 426
 427         /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
 428         if (xPSR & 0xf00) {
 429                 r->dirty = r->valid;
 430                 cortex_m_store_core_reg_u32(target, 16, xPSR & ~0xff);
 431         }
 432
 433         /* Are we in an exception handler */
 434         if (xPSR & 0x1FF) {
 435                 armv7m->exception_number = (xPSR & 0x1FF);
 436
 437                 arm->core_mode = ARM_MODE_HANDLER;
 438                 arm->map = armv7m_msp_reg_map;
 439         } else {
 440                 unsigned control = buf_get_u32(arm->core_cache
 441                                 ->reg_list[ARMV7M_CONTROL].value, 0, 2);
 442
 443                 /* is this thread privileged? */
 444                 arm->core_mode = control & 1
 445                         ? ARM_MODE_USER_THREAD
 446                         : ARM_MODE_THREAD;
 447
 448                 /* which stack is it using? */
 449                 if (control & 2)
 450                         arm->map = armv7m_psp_reg_map;
 451                 else
 452                         arm->map = armv7m_msp_reg_map;
 453
 454                 armv7m->exception_number = 0;
 455         }
 456
 457         if (armv7m->exception_number)
 458                 cortex_m_examine_exception_reason(target);
 459
 460         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%" PRIx32 ", target->state: %s",
 461                 arm_mode_name(arm->core_mode),
 462                 buf_get_u32(arm->pc->value, 0, 32),
 463                 target_state_name(target));
 464
 465         if (armv7m->post_debug_entry) {
 466                 retval = armv7m->post_debug_entry(target);
 467                 if (retval != ERROR_OK)
 468                         return retval;
 469         }
 470
 471         return ERROR_OK;
 472 }
 473
 474 static int cortex_m_poll(struct target *target)
 475 {
 476         int detected_failure = ERROR_OK;
 477         int retval = ERROR_OK;
 478         enum target_state prev_target_state = target->state;
 479         struct cortex_m_common *cortex_m = target_to_cm(target);
 480         struct armv7m_common *armv7m = &cortex_m->armv7m;
 481
 482         /* Read from Debug Halting Control and Status Register */
 483         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 484         if (retval != ERROR_OK) {
 485                 target->state = TARGET_UNKNOWN;
 486                 return retval;
 487         }
 488
 489         /* Recover from lockup.  See ARMv7-M architecture spec,
 490          * section B1.5.15 "Unrecoverable exception cases".
 491          */
 492         if (cortex_m->dcb_dhcsr & S_LOCKUP) {
 493                 LOG_ERROR("%s -- clearing lockup after double fault",
 494                         target_name(target));
 495                 cortex_m_write_debug_halt_mask(target, C_HALT, 0);
 496                 target->debug_reason = DBG_REASON_DBGRQ;
 497
 498                 /* We have to execute the rest (the "finally" equivalent, but
 499                  * still throw this exception again).
 500                  */
 501                 detected_failure = ERROR_FAIL;
 502
 503                 /* refresh status bits */
 504                 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 505                 if (retval != ERROR_OK)
 506                         return retval;
 507         }
 508
 509         if (cortex_m->dcb_dhcsr & S_RESET_ST) {
 510                 target->state = TARGET_RESET;
 511                 return ERROR_OK;
 512         }
 513
 514         if (target->state == TARGET_RESET) {
 515                 /* Cannot switch context while running so endreset is
 516                  * called with target->state == TARGET_RESET
 517                  */
 518                 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%" PRIx32,
 519                         cortex_m->dcb_dhcsr);
 520                 retval = cortex_m_endreset_event(target);
 521                 if (retval != ERROR_OK) {
 522                         target->state = TARGET_UNKNOWN;
 523                         return retval;
 524                 }
 525                 target->state = TARGET_RUNNING;
 526                 prev_target_state = TARGET_RUNNING;
 527         }
 528
 529         if (cortex_m->dcb_dhcsr & S_HALT) {
 530                 target->state = TARGET_HALTED;
 531
 532                 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET)) {
 533                         retval = cortex_m_debug_entry(target);
 534                         if (retval != ERROR_OK)
 535                                 return retval;
 536
 537                         if (arm_semihosting(target, &retval) != 0)
 538                                 return retval;
 539
 540                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 541                 }
 542                 if (prev_target_state == TARGET_DEBUG_RUNNING) {
 543                         LOG_DEBUG(" ");
 544                         retval = cortex_m_debug_entry(target);
 545                         if (retval != ERROR_OK)
 546                                 return retval;
 547
 548                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 549                 }
 550         }
 551
 552         /* REVISIT when S_SLEEP is set, it's in a Sleep or DeepSleep state.
 553          * How best to model low power modes?
 554          */
 555
 556         if (target->state == TARGET_UNKNOWN) {
 557                 /* check if processor is retiring instructions */
 558                 if (cortex_m->dcb_dhcsr & S_RETIRE_ST) {
 559                         target->state = TARGET_RUNNING;
 560                         retval = ERROR_OK;
 561                 }
 562         }
 563
 564         /* Did we detect a failure condition that we cleared? */
 565         if (detected_failure != ERROR_OK)
 566                 retval = detected_failure;
 567         return retval;
 568 }
 569
 570 static int cortex_m_halt(struct target *target)
 571 {
 572         LOG_DEBUG("target->state: %s",
 573                 target_state_name(target));
 574
 575         if (target->state == TARGET_HALTED) {
 576                 LOG_DEBUG("target was already halted");
 577                 return ERROR_OK;
 578         }
 579
 580         if (target->state == TARGET_UNKNOWN)
 581                 LOG_WARNING("target was in unknown state when halt was requested");
 582
 583         if (target->state == TARGET_RESET) {
 584                 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst()) {
 585                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 586                         return ERROR_TARGET_FAILURE;
 587                 } else {
 588                         /* we came here in a reset_halt or reset_init sequence
 589                          * debug entry was already prepared in cortex_m3_assert_reset()
 590                          */
 591                         target->debug_reason = DBG_REASON_DBGRQ;
 592
 593                         return ERROR_OK;
 594                 }
 595         }
 596
 597         /* Write to Debug Halting Control and Status Register */
 598         cortex_m_write_debug_halt_mask(target, C_HALT, 0);
 599
 600         target->debug_reason = DBG_REASON_DBGRQ;
 601
 602         return ERROR_OK;
 603 }
 604
 605 static int cortex_m_soft_reset_halt(struct target *target)
 606 {
 607         struct cortex_m_common *cortex_m = target_to_cm(target);
 608         struct armv7m_common *armv7m = &cortex_m->armv7m;
 609         uint32_t dcb_dhcsr = 0;
 610         int retval, timeout = 0;
 611
 612         /* soft_reset_halt is deprecated on cortex_m as the same functionality
 613          * can be obtained by using 'reset halt' and 'cortex_m reset_config vectreset'
 614          * As this reset only used VC_CORERESET it would only ever reset the cortex_m
 615          * core, not the peripherals */
 616         LOG_WARNING("soft_reset_halt is deprecated, please use 'reset halt' instead.");
 617
 618         /* Enter debug state on reset; restore DEMCR in endreset_event() */
 619         retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR,
 620                         TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
 621         if (retval != ERROR_OK)
 622                 return retval;
 623
 624         /* Request a core-only reset */
 625         retval = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_AIRCR,
 626                         AIRCR_VECTKEY | AIRCR_VECTRESET);
 627         if (retval != ERROR_OK)
 628                 return retval;
 629         target->state = TARGET_RESET;
 630
 631         /* registers are now invalid */
 632         register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
 633
 634         while (timeout < 100) {
 635                 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &dcb_dhcsr);
 636                 if (retval == ERROR_OK) {
 637                         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_DFSR,
 638                                         &cortex_m->nvic_dfsr);
 639                         if (retval != ERROR_OK)
 640                                 return retval;
 641                         if ((dcb_dhcsr & S_HALT)
 642                                 && (cortex_m->nvic_dfsr & DFSR_VCATCH)) {
 643                                 LOG_DEBUG("system reset-halted, DHCSR 0x%08x, "
 644                                         "DFSR 0x%08x",
 645                                         (unsigned) dcb_dhcsr,
 646                                         (unsigned) cortex_m->nvic_dfsr);
 647                                 cortex_m_poll(target);
 648                                 /* FIXME restore user's vector catch config */
 649                                 return ERROR_OK;
 650                         } else
 651                                 LOG_DEBUG("waiting for system reset-halt, "
 652                                         "DHCSR 0x%08x, %d ms",
 653                                         (unsigned) dcb_dhcsr, timeout);
 654                 }
 655                 timeout++;
 656                 alive_sleep(1);
 657         }
 658
 659         return ERROR_OK;
 660 }
 661
 662 void cortex_m_enable_breakpoints(struct target *target)
 663 {
 664         struct breakpoint *breakpoint = target->breakpoints;
 665
 666         /* set any pending breakpoints */
 667         while (breakpoint) {
 668                 if (!breakpoint->set)
 669                         cortex_m_set_breakpoint(target, breakpoint);
 670                 breakpoint = breakpoint->next;
 671         }
 672 }
 673
 674 static int cortex_m_resume(struct target *target, int current,
 675         target_addr_t address, int handle_breakpoints, int debug_execution)
 676 {
 677         struct armv7m_common *armv7m = target_to_armv7m(target);
 678         struct breakpoint *breakpoint = NULL;
 679         uint32_t resume_pc;
 680         struct reg *r;
 681
 682         if (target->state != TARGET_HALTED) {
 683                 LOG_WARNING("target not halted");
 684                 return ERROR_TARGET_NOT_HALTED;
 685         }
 686
 687         if (!debug_execution) {
 688                 target_free_all_working_areas(target);
 689                 cortex_m_enable_breakpoints(target);
 690                 cortex_m_enable_watchpoints(target);
 691         }
 692
 693         if (debug_execution) {
 694                 r = armv7m->arm.core_cache->reg_list + ARMV7M_PRIMASK;
 695
 696                 /* Disable interrupts */
 697                 /* We disable interrupts in the PRIMASK register instead of
 698                  * masking with C_MASKINTS.  This is probably the same issue
 699                  * as Cortex-M3 Erratum 377493 (fixed in r1p0):  C_MASKINTS
 700                  * in parallel with disabled interrupts can cause local faults
 701                  * to not be taken.
 702                  *
 703                  * REVISIT this clearly breaks non-debug execution, since the
 704                  * PRIMASK register state isn't saved/restored...  workaround
 705                  * by never resuming app code after debug execution.
 706                  */
 707                 buf_set_u32(r->value, 0, 1, 1);
 708                 r->dirty = true;
 709                 r->valid = true;
 710
 711                 /* Make sure we are in Thumb mode */
 712                 r = armv7m->arm.cpsr;
 713                 buf_set_u32(r->value, 24, 1, 1);
 714                 r->dirty = true;
 715                 r->valid = true;
 716         }
 717
 718         /* current = 1: continue on current pc, otherwise continue at <address> */
 719         r = armv7m->arm.pc;
 720         if (!current) {
 721                 buf_set_u32(r->value, 0, 32, address);
 722                 r->dirty = true;
 723                 r->valid = true;
 724         }
 725
 726         /* if we halted last time due to a bkpt instruction
 727          * then we have to manually step over it, otherwise
 728          * the core will break again */
 729
 730         if (!breakpoint_find(target, buf_get_u32(r->value, 0, 32))
 731                 && !debug_execution)
 732                 armv7m_maybe_skip_bkpt_inst(target, NULL);
 733
 734         resume_pc = buf_get_u32(r->value, 0, 32);
 735
 736         armv7m_restore_context(target);
 737
 738         /* the front-end may request us not to handle breakpoints */
 739         if (handle_breakpoints) {
 740                 /* Single step past breakpoint at current address */
 741                 breakpoint = breakpoint_find(target, resume_pc);
 742                 if (breakpoint) {
 743                         LOG_DEBUG("unset breakpoint at " TARGET_ADDR_FMT " (ID: %" PRIu32 ")",
 744                                 breakpoint->address,
 745                                 breakpoint->unique_id);
 746                         cortex_m_unset_breakpoint(target, breakpoint);
 747                         cortex_m_single_step_core(target);
 748                         cortex_m_set_breakpoint(target, breakpoint);
 749                 }
 750         }
 751
 752         /* Restart core */
 753         cortex_m_write_debug_halt_mask(target, 0, C_HALT);
 754
 755         target->debug_reason = DBG_REASON_NOTHALTED;
 756
 757         /* registers are now invalid */
 758         register_cache_invalidate(armv7m->arm.core_cache);
 759
 760         if (!debug_execution) {
 761                 target->state = TARGET_RUNNING;
 762                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 763                 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
 764         } else {
 765                 target->state = TARGET_DEBUG_RUNNING;
 766                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 767                 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
 768         }
 769
 770         return ERROR_OK;
 771 }
 772
 773 /* int irqstepcount = 0; */
 774 static int cortex_m_step(struct target *target, int current,
 775         target_addr_t address, int handle_breakpoints)
 776 {
 777         struct cortex_m_common *cortex_m = target_to_cm(target);
 778         struct armv7m_common *armv7m = &cortex_m->armv7m;
 779         struct breakpoint *breakpoint = NULL;
 780         struct reg *pc = armv7m->arm.pc;
 781         bool bkpt_inst_found = false;
 782         int retval;
 783         bool isr_timed_out = false;
 784
 785         if (target->state != TARGET_HALTED) {
 786                 LOG_WARNING("target not halted");
 787                 return ERROR_TARGET_NOT_HALTED;
 788         }
 789
 790         /* current = 1: continue on current pc, otherwise continue at <address> */
 791         if (!current)
 792                 buf_set_u32(pc->value, 0, 32, address);
 793
 794         uint32_t pc_value = buf_get_u32(pc->value, 0, 32);
 795
 796         /* the front-end may request us not to handle breakpoints */
 797         if (handle_breakpoints) {
 798                 breakpoint = breakpoint_find(target, pc_value);
 799                 if (breakpoint)
 800                         cortex_m_unset_breakpoint(target, breakpoint);
 801         }
 802
 803         armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found);
 804
 805         target->debug_reason = DBG_REASON_SINGLESTEP;
 806
 807         armv7m_restore_context(target);
 808
 809         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 810
 811         /* if no bkpt instruction is found at pc then we can perform
 812          * a normal step, otherwise we have to manually step over the bkpt
 813          * instruction - as such simulate a step */
 814         if (bkpt_inst_found == false) {
 815                 /* Automatic ISR masking mode off: Just step over the next instruction */
 816                 if ((cortex_m->isrmasking_mode != CORTEX_M_ISRMASK_AUTO))
 817                         cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
 818                 else {
 819                         /* Process interrupts during stepping in a way they don't interfere
 820                          * debugging.
 821                          *
 822                          * Principle:
 823                          *
 824                          * Set a temporary break point at the current pc and let the core run
 825                          * with interrupts enabled. Pending interrupts get served and we run
 826                          * into the breakpoint again afterwards. Then we step over the next
 827                          * instruction with interrupts disabled.
 828                          *
 829                          * If the pending interrupts don't complete within time, we leave the
 830                          * core running. This may happen if the interrupts trigger faster
 831                          * than the core can process them or the handler doesn't return.
 832                          *
 833                          * If no more breakpoints are available we simply do a step with
 834                          * interrupts enabled.
 835                          *
 836                          */
 837
 838                         /* 2012-09-29 ph
 839                          *
 840                          * If a break point is already set on the lower half word then a break point on
 841                          * the upper half word will not break again when the core is restarted. So we
 842                          * just step over the instruction with interrupts disabled.
 843                          *
 844                          * The documentation has no information about this, it was found by observation
 845                          * on STM32F1 and STM32F2. Proper explanation welcome. STM32F0 dosen't seem to
 846                          * suffer from this problem.
 847                          *
 848                          * To add some confusion: pc_value has bit 0 always set, while the breakpoint
 849                          * address has it always cleared. The former is done to indicate thumb mode
 850                          * to gdb.
 851                          *
 852                          */
 853                         if ((pc_value & 0x02) && breakpoint_find(target, pc_value & ~0x03)) {
 854                                 LOG_DEBUG("Stepping over next instruction with interrupts disabled");
 855                                 cortex_m_write_debug_halt_mask(target, C_HALT | C_MASKINTS, 0);
 856                                 cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
 857                                 /* Re-enable interrupts */
 858                                 cortex_m_write_debug_halt_mask(target, C_HALT, C_MASKINTS);
 859                         }
 860                         else {
 861
 862                                 /* Set a temporary break point */
 863                                 if (breakpoint)
 864                                         retval = cortex_m_set_breakpoint(target, breakpoint);
 865                                 else
 866                                         retval = breakpoint_add(target, pc_value, 2, BKPT_HARD);
 867                                 bool tmp_bp_set = (retval == ERROR_OK);
 868
 869                                 /* No more breakpoints left, just do a step */
 870                                 if (!tmp_bp_set)
 871                                         cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
 872                                 else {
 873                                         /* Start the core */
 874                                         LOG_DEBUG("Starting core to serve pending interrupts");
 875                                         int64_t t_start = timeval_ms();
 876                                         cortex_m_write_debug_halt_mask(target, 0, C_HALT | C_STEP);
 877
 878                                         /* Wait for pending handlers to complete or timeout */
 879                                         do {
 880                                                 retval = mem_ap_read_atomic_u32(armv7m->debug_ap,
 881                                                                 DCB_DHCSR,
 882                                                                 &cortex_m->dcb_dhcsr);
 883                                                 if (retval != ERROR_OK) {
 884                                                         target->state = TARGET_UNKNOWN;
 885                                                         return retval;
 886                                                 }
 887                                                 isr_timed_out = ((timeval_ms() - t_start) > 500);
 888                                         } while (!((cortex_m->dcb_dhcsr & S_HALT) || isr_timed_out));
 889
 890                                         /* only remove breakpoint if we created it */
 891                                         if (breakpoint)
 892                                                 cortex_m_unset_breakpoint(target, breakpoint);
 893                                         else {
 894                                                 /* Remove the temporary breakpoint */
 895                                                 breakpoint_remove(target, pc_value);
 896                                         }
 897
 898                                         if (isr_timed_out) {
 899                                                 LOG_DEBUG("Interrupt handlers didn't complete within time, "
 900                                                         "leaving target running");
 901                                         } else {
 902                                                 /* Step over next instruction with interrupts disabled */
 903                                                 cortex_m_write_debug_halt_mask(target,
 904                                                         C_HALT | C_MASKINTS,
 905                                                         0);
 906                                                 cortex_m_write_debug_halt_mask(target, C_STEP, C_HALT);
 907                                                 /* Re-enable interrupts */
 908                                                 cortex_m_write_debug_halt_mask(target, C_HALT, C_MASKINTS);
 909                                         }
 910                                 }
 911                         }
 912                 }
 913         }
 914
 915         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 916         if (retval != ERROR_OK)
 917                 return retval;
 918
 919         /* registers are now invalid */
 920         register_cache_invalidate(armv7m->arm.core_cache);
 921
 922         if (breakpoint)
 923                 cortex_m_set_breakpoint(target, breakpoint);
 924
 925         if (isr_timed_out) {
 926                 /* Leave the core running. The user has to stop execution manually. */
 927                 target->debug_reason = DBG_REASON_NOTHALTED;
 928                 target->state = TARGET_RUNNING;
 929                 return ERROR_OK;
 930         }
 931
 932         LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
 933                 " nvic_icsr = 0x%" PRIx32,
 934                 cortex_m->dcb_dhcsr, cortex_m->nvic_icsr);
 935
 936         retval = cortex_m_debug_entry(target);
 937         if (retval != ERROR_OK)
 938                 return retval;
 939         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 940
 941         LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32
 942                 " nvic_icsr = 0x%" PRIx32,
 943                 cortex_m->dcb_dhcsr, cortex_m->nvic_icsr);
 944
 945         return ERROR_OK;
 946 }
 947
 948 static int cortex_m_assert_reset(struct target *target)
 949 {
 950         struct cortex_m_common *cortex_m = target_to_cm(target);
 951         struct armv7m_common *armv7m = &cortex_m->armv7m;
 952         enum cortex_m_soft_reset_config reset_config = cortex_m->soft_reset_config;
 953
 954         LOG_DEBUG("target->state: %s",
 955                 target_state_name(target));
 956
 957         enum reset_types jtag_reset_config = jtag_get_reset_config();
 958
 959         if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
 960                 /* allow scripts to override the reset event */
 961
 962                 target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
 963                 register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
 964                 target->state = TARGET_RESET;
 965
 966                 return ERROR_OK;
 967         }
 968
 969         /* some cores support connecting while srst is asserted
 970          * use that mode is it has been configured */
 971
 972         bool srst_asserted = false;
 973
 974         if (!target_was_examined(target)) {
 975                 if (jtag_reset_config & RESET_HAS_SRST) {
 976                         adapter_assert_reset();
 977                         if (target->reset_halt)
 978                                 LOG_ERROR("Target not examined, will not halt after reset!");
 979                         return ERROR_OK;
 980                 } else {
 981                         LOG_ERROR("Target not examined, reset NOT asserted!");
 982                         return ERROR_FAIL;
 983                 }
 984         }
 985
 986         if ((jtag_reset_config & RESET_HAS_SRST) &&
 987             (jtag_reset_config & RESET_SRST_NO_GATING)) {
 988                 adapter_assert_reset();
 989                 srst_asserted = true;
 990         }
 991
 992         /* Enable debug requests */
 993         int retval;
 994         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DHCSR, &cortex_m->dcb_dhcsr);
 995         /* Store important errors instead of failing and proceed to reset assert */
 996
 997         if (retval != ERROR_OK || !(cortex_m->dcb_dhcsr & C_DEBUGEN))
 998                 retval = cortex_m_write_debug_halt_mask(target, 0, C_HALT | C_STEP | C_MASKINTS);
 999
1000         /* If the processor is sleeping in a WFI or WFE instruction, the
1001          * C_HALT bit must be asserted to regain control */
1002         if (retval == ERROR_OK && (cortex_m->dcb_dhcsr & S_SLEEP))
1003                 retval = cortex_m_write_debug_halt_mask(target, C_HALT, 0);
1004
1005         mem_ap_write_u32(armv7m->debug_ap, DCB_DCRDR, 0);
1006         /* Ignore less important errors */
1007
1008         if (!target->reset_halt) {
1009                 /* Set/Clear C_MASKINTS in a separate operation */
1010                 if (cortex_m->dcb_dhcsr & C_MASKINTS)
1011                         cortex_m_write_debug_halt_mask(target, 0, C_MASKINTS);
1012
1013                 /* clear any debug flags before resuming */
1014                 cortex_m_clear_halt(target);
1015
1016                 /* clear C_HALT in dhcsr reg */
1017                 cortex_m_write_debug_halt_mask(target, 0, C_HALT);
1018         } else {
1019                 /* Halt in debug on reset; endreset_event() restores DEMCR.
1020                  *
1021                  * REVISIT catching BUSERR presumably helps to defend against
1022                  * bad vector table entries.  Should this include MMERR or
1023                  * other flags too?
1024                  */
1025                 int retval2;
1026                 retval2 = mem_ap_write_atomic_u32(armv7m->debug_ap, DCB_DEMCR,
1027                                 TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
1028                 if (retval != ERROR_OK || retval2 != ERROR_OK)
1029                         LOG_INFO("AP write error, reset will not halt");
1030         }
1031
1032         if (jtag_reset_config & RESET_HAS_SRST) {
1033                 /* default to asserting srst */
1034                 if (!srst_asserted)
1035                         adapter_assert_reset();
1036
1037                 /* srst is asserted, ignore AP access errors */
1038                 retval = ERROR_OK;
1039         } else {
1040                 /* Use a standard Cortex-M3 software reset mechanism.
1041                  * We default to using VECRESET as it is supported on all current cores.
1042                  * This has the disadvantage of not resetting the peripherals, so a
1043                  * reset-init event handler is needed to perform any peripheral resets.
1044                  */
1045                 LOG_DEBUG("Using Cortex-M %s", (reset_config == CORTEX_M_RESET_SYSRESETREQ)
1046                         ? "SYSRESETREQ" : "VECTRESET");
1047
1048                 if (reset_config == CORTEX_M_RESET_VECTRESET) {
1049                         LOG_WARNING("Only resetting the Cortex-M core, use a reset-init event "
1050                                 "handler to reset any peripherals or configure hardware srst support.");
1051                 }
1052
1053                 int retval3;
1054                 retval3 = mem_ap_write_atomic_u32(armv7m->debug_ap, NVIC_AIRCR,
1055                                 AIRCR_VECTKEY | ((reset_config == CORTEX_M_RESET_SYSRESETREQ)
1056                                 ? AIRCR_SYSRESETREQ : AIRCR_VECTRESET));
1057                 if (retval3 != ERROR_OK)
1058                         LOG_DEBUG("Ignoring AP write error right after reset");
1059
1060                 retval3 = dap_dp_init(armv7m->debug_ap->dap);
1061                 if (retval3 != ERROR_OK)
1062                         LOG_ERROR("DP initialisation failed");
1063
1064                 else {
1065                         /* I do not know why this is necessary, but it
1066                          * fixes strange effects (step/resume cause NMI
1067                          * after reset) on LM3S6918 -- Michael Schwingen
1068                          */
1069                         uint32_t tmp;
1070                         mem_ap_read_atomic_u32(armv7m->debug_ap, NVIC_AIRCR, &tmp);
1071                 }
1072         }
1073
1074         target->state = TARGET_RESET;
1075         jtag_add_sleep(50000);
1076
1077         register_cache_invalidate(cortex_m->armv7m.arm.core_cache);
1078
1079         /* now return stored error code if any */
1080         if (retval != ERROR_OK)
1081                 return retval;
1082
1083         if (target->reset_halt) {
1084                 retval = target_halt(target);
1085                 if (retval != ERROR_OK)
1086                         return retval;
1087         }
1088
1089         return ERROR_OK;
1090 }
1091
1092 static int cortex_m_deassert_reset(struct target *target)
1093 {
1094         struct armv7m_common *armv7m = &target_to_cm(target)->armv7m;
1095
1096         LOG_DEBUG("target->state: %s",
1097                 target_state_name(target));
1098
1099         /* deassert reset lines */
1100         adapter_deassert_reset();
1101
1102         enum reset_types jtag_reset_config = jtag_get_reset_config();
1103
1104         if ((jtag_reset_config & RESET_HAS_SRST) &&
1105             !(jtag_reset_config & RESET_SRST_NO_GATING) &&
1106                 target_was_examined(target)) {
1107                 int retval = dap_dp_init(armv7m->debug_ap->dap);
1108                 if (retval != ERROR_OK) {
1109                         LOG_ERROR("DP initialisation failed");
1110                         return retval;
1111                 }
1112         }
1113
1114         return ERROR_OK;
1115 }
1116
1117 int cortex_m_set_breakpoint(struct target *target, struct breakpoint *breakpoint)
1118 {
1119         int retval;
1120         int fp_num = 0;
1121         struct cortex_m_common *cortex_m = target_to_cm(target);
1122         struct cortex_m_fp_comparator *comparator_list = cortex_m->fp_comparator_list;
1123
1124         if (breakpoint->set) {
1125                 LOG_WARNING("breakpoint (BPID: %" PRIu32 ") already set", breakpoint->unique_id);
1126                 return ERROR_OK;
1127         }
1128
1129         if (breakpoint->type == BKPT_HARD) {
1130                 uint32_t fpcr_value;
1131                 while (comparator_list[fp_num].used && (fp_num < cortex_m->fp_num_code))
1132                         fp_num++;
1133                 if (fp_num >= cortex_m->fp_num_code) {
1134                         LOG_ERROR("Can not find free FPB Comparator!");
1135                         return ERROR_FAIL;
1136                 }
1137                 breakpoint->set = fp_num + 1;
1138                 fpcr_value = breakpoint->address | 1;
1139                 if (cortex_m->fp_rev == 0) {
1140                         uint32_t hilo;
1141                         hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
1142                         fpcr_value = (fpcr_value & 0x1FFFFFFC) | hilo | 1;
1143                 } else if (cortex_m->fp_rev > 1) {
1144                         LOG_ERROR("Unhandled Cortex-M Flash Patch Breakpoint architecture revision");
1145                         return ERROR_FAIL;
1146                 }
1147                 comparator_list[fp_num].used = 1;
1148                 comparator_list[fp_num].fpcr_value = fpcr_value;
1149                 target_write_u32(target, comparator_list[fp_num].fpcr_address,
1150                         comparator_list[fp_num].fpcr_value);
1151                 LOG_DEBUG("fpc_num %i fpcr_value 0x%" PRIx32 "",
1152                         fp_num,
1153                         comparator_list[fp_num].fpcr_value);
1154                 if (!cortex_m->fpb_enabled) {
1155                         LOG_DEBUG("FPB wasn't enabled, do it now");
1156                         retval = cortex_m_enable_fpb(target);
1157                         if (retval != ERROR_OK) {
1158                                 LOG_ERROR("Failed to enable the FPB");
1159                                 return retval;
1160                         }
1161
1162                         cortex_m->fpb_enabled = 1;
1163                 }
1164         } else if (breakpoint->type == BKPT_SOFT) {
1165                 uint8_t code[4];
1166
1167                 /* NOTE: on ARMv6-M and ARMv7-M, BKPT(0xab) is used for
1168                  * semihosting; don't use that.  Otherwise the BKPT
1169                  * parameter is arbitrary.
1170                  */
1171                 buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1172                 retval = target_read_memory(target,
1173                                 breakpoint->address & 0xFFFFFFFE,
1174                                 breakpoint->length, 1,
1175                                 breakpoint->orig_instr);
1176                 if (retval != ERROR_OK)
1177                         return retval;
1178                 retval = target_write_memory(target,
1179                                 breakpoint->address & 0xFFFFFFFE,
1180                                 breakpoint->length, 1,
1181                                 code);
1182                 if (retval != ERROR_OK)
1183                         return retval;
1184                 breakpoint->set = true;
1185         }
1186
1187         LOG_DEBUG("BPID: %" PRIu32 ", Type: %d, Address: " TARGET_ADDR_FMT " Length: %d (set=%d)",
1188                 breakpoint->unique_id,
1189                 (int)(breakpoint->type),
1190                 breakpoint->address,
1191                 breakpoint->length,
1192                 breakpoint->set);
1193
1194         return ERROR_OK;
1195 }
1196
1197 int cortex_m_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
1198 {
1199         int retval;
1200         struct cortex_m_common *cortex_m = target_to_cm(target);
1201         struct cortex_m_fp_comparator *comparator_list = cortex_m->fp_comparator_list;
1202
1203         if (!breakpoint->set) {
1204                 LOG_WARNING("breakpoint not set");
1205                 return ERROR_OK;
1206         }
1207
1208         LOG_DEBUG("BPID: %" PRIu32 ", Type: %d, Address: " TARGET_ADDR_FMT " Length: %d (set=%d)",
1209                 breakpoint->unique_id,
1210                 (int)(breakpoint->type),
1211                 breakpoint->address,
1212                 breakpoint->length,
1213                 breakpoint->set);
1214
1215         if (breakpoint->type == BKPT_HARD) {
1216                 int fp_num = breakpoint->set - 1;
1217                 if ((fp_num < 0) || (fp_num >= cortex_m->fp_num_code)) {
1218                         LOG_DEBUG("Invalid FP Comparator number in breakpoint");
1219                         return ERROR_OK;
1220                 }
1221                 comparator_list[fp_num].used = 0;
1222                 comparator_list[fp_num].fpcr_value = 0;
1223                 target_write_u32(target, comparator_list[fp_num].fpcr_address,
1224                         comparator_list[fp_num].fpcr_value);
1225         } else {
1226                 /* restore original instruction (kept in target endianness) */
1227                 if (breakpoint->length == 4) {
1228                         retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1,
1229                                         breakpoint->orig_instr);
1230                         if (retval != ERROR_OK)
1231                                 return retval;
1232                 } else {
1233                         retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1,
1234                                         breakpoint->orig_instr);
1235                         if (retval != ERROR_OK)
1236                                 return retval;
1237                 }
1238         }
1239         breakpoint->set = false;
1240
1241         return ERROR_OK;
1242 }
1243
1244 int cortex_m_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
1245 {
1246         struct cortex_m_common *cortex_m = target_to_cm(target);
1247
1248         if ((breakpoint->type == BKPT_HARD) && (cortex_m->fp_code_available < 1)) {
1249                 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
1250                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1251         }
1252
1253         if (breakpoint->length == 3) {
1254                 LOG_DEBUG("Using a two byte breakpoint for 32bit Thumb-2 request");
1255                 breakpoint->length = 2;
1256         }
1257
1258         if ((breakpoint->length != 2)) {
1259                 LOG_INFO("only breakpoints of two bytes length supported");
1260                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1261         }
1262
1263         if (breakpoint->type == BKPT_HARD)
1264                 cortex_m->fp_code_available--;
1265
1266         return cortex_m_set_breakpoint(target, breakpoint);
1267 }
1268
1269 int cortex_m_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
1270 {
1271         struct cortex_m_common *cortex_m = target_to_cm(target);
1272
1273         /* REVISIT why check? FBP can be updated with core running ... */
1274         if (target->state != TARGET_HALTED) {
1275                 LOG_WARNING("target not halted");
1276                 return ERROR_TARGET_NOT_HALTED;
1277         }
1278
1279         if (breakpoint->set)
1280                 cortex_m_unset_breakpoint(target, breakpoint);
1281
1282         if (breakpoint->type == BKPT_HARD)
1283                 cortex_m->fp_code_available++;
1284
1285         return ERROR_OK;
1286 }
1287
1288 int cortex_m_set_watchpoint(struct target *target, struct watchpoint *watchpoint)
1289 {
1290         int dwt_num = 0;
1291         uint32_t mask, temp;
1292         struct cortex_m_common *cortex_m = target_to_cm(target);
1293
1294         /* watchpoint params were validated earlier */
1295         mask = 0;
1296         temp = watchpoint->length;
1297         while (temp) {
1298                 temp >>= 1;
1299                 mask++;
1300         }
1301         mask--;
1302
1303         /* REVISIT Don't fully trust these "not used" records ... users
1304          * may set up breakpoints by hand, e.g. dual-address data value
1305          * watchpoint using comparator #1; comparator #0 matching cycle
1306          * count; send data trace info through ITM and TPIU; etc
1307          */
1308         struct cortex_m_dwt_comparator *comparator;
1309
1310         for (comparator = cortex_m->dwt_comparator_list;
1311                 comparator->used && dwt_num < cortex_m->dwt_num_comp;
1312                 comparator++, dwt_num++)
1313                 continue;
1314         if (dwt_num >= cortex_m->dwt_num_comp) {
1315                 LOG_ERROR("Can not find free DWT Comparator");
1316                 return ERROR_FAIL;
1317         }
1318         comparator->used = 1;
1319         watchpoint->set = dwt_num + 1;
1320
1321         comparator->comp = watchpoint->address;
1322         target_write_u32(target, comparator->dwt_comparator_address + 0,
1323                 comparator->comp);
1324
1325         comparator->mask = mask;
1326         target_write_u32(target, comparator->dwt_comparator_address + 4,
1327                 comparator->mask);
1328
1329         switch (watchpoint->rw) {
1330                 case WPT_READ:
1331                         comparator->function = 5;
1332                         break;
1333                 case WPT_WRITE:
1334                         comparator->function = 6;
1335                         break;
1336                 case WPT_ACCESS:
1337                         comparator->function = 7;
1338                         break;
1339         }
1340         target_write_u32(target, comparator->dwt_comparator_address + 8,
1341                 comparator->function);
1342
1343         LOG_DEBUG("Watchpoint (ID %d) DWT%d 0x%08x 0x%x 0x%05x",
1344                 watchpoint->unique_id, dwt_num,
1345                 (unsigned) comparator->comp,
1346                 (unsigned) comparator->mask,
1347                 (unsigned) comparator->function);
1348         return ERROR_OK;
1349 }
1350
1351 int cortex_m_unset_watchpoint(struct target *target, struct watchpoint *watchpoint)
1352 {
1353         struct cortex_m_common *cortex_m = target_to_cm(target);
1354         struct cortex_m_dwt_comparator *comparator;
1355         int dwt_num;
1356
1357         if (!watchpoint->set) {
1358                 LOG_WARNING("watchpoint (wpid: %d) not set",
1359                         watchpoint->unique_id);
1360                 return ERROR_OK;
1361         }
1362
1363         dwt_num = watchpoint->set - 1;
1364
1365         LOG_DEBUG("Watchpoint (ID %d) DWT%d address: 0x%08x clear",
1366                 watchpoint->unique_id, dwt_num,
1367                 (unsigned) watchpoint->address);
1368
1369         if ((dwt_num < 0) || (dwt_num >= cortex_m->dwt_num_comp)) {
1370                 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1371                 return ERROR_OK;
1372         }
1373
1374         comparator = cortex_m->dwt_comparator_list + dwt_num;
1375         comparator->used = 0;
1376         comparator->function = 0;
1377         target_write_u32(target, comparator->dwt_comparator_address + 8,
1378                 comparator->function);
1379
1380         watchpoint->set = false;
1381
1382         return ERROR_OK;
1383 }
1384
1385 int cortex_m_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
1386 {
1387         struct cortex_m_common *cortex_m = target_to_cm(target);
1388
1389         if (cortex_m->dwt_comp_available < 1) {
1390                 LOG_DEBUG("no comparators?");
1391                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1392         }
1393
1394         /* hardware doesn't support data value masking */
1395         if (watchpoint->mask != ~(uint32_t)0) {
1396                 LOG_DEBUG("watchpoint value masks not supported");
1397                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1398         }
1399
1400         /* hardware allows address masks of up to 32K */
1401         unsigned mask;
1402
1403         for (mask = 0; mask < 16; mask++) {
1404                 if ((1u << mask) == watchpoint->length)
1405                         break;
1406         }
1407         if (mask == 16) {
1408                 LOG_DEBUG("unsupported watchpoint length");
1409                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1410         }
1411         if (watchpoint->address & ((1 << mask) - 1)) {
1412                 LOG_DEBUG("watchpoint address is unaligned");
1413                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1414         }
1415
1416         /* Caller doesn't seem to be able to describe watching for data
1417          * values of zero; that flags "no value".
1418          *
1419          * REVISIT This DWT may well be able to watch for specific data
1420          * values.  Requires comparator #1 to set DATAVMATCH and match
1421          * the data, and another comparator (DATAVADDR0) matching addr.
1422          */
1423         if (watchpoint->value) {
1424                 LOG_DEBUG("data value watchpoint not YET supported");
1425                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1426         }
1427
1428         cortex_m->dwt_comp_available--;
1429         LOG_DEBUG("dwt_comp_available: %d", cortex_m->dwt_comp_available);
1430
1431         return ERROR_OK;
1432 }
1433
1434 int cortex_m_remove_watchpoint(struct target *target, struct watchpoint *watchpoint)
1435 {
1436         struct cortex_m_common *cortex_m = target_to_cm(target);
1437
1438         /* REVISIT why check? DWT can be updated with core running ... */
1439         if (target->state != TARGET_HALTED) {
1440                 LOG_WARNING("target not halted");
1441                 return ERROR_TARGET_NOT_HALTED;
1442         }
1443
1444         if (watchpoint->set)
1445                 cortex_m_unset_watchpoint(target, watchpoint);
1446
1447         cortex_m->dwt_comp_available++;
1448         LOG_DEBUG("dwt_comp_available: %d", cortex_m->dwt_comp_available);
1449
1450         return ERROR_OK;
1451 }
1452
1453 void cortex_m_enable_watchpoints(struct target *target)
1454 {
1455         struct watchpoint *watchpoint = target->watchpoints;
1456
1457         /* set any pending watchpoints */
1458         while (watchpoint) {
1459                 if (!watchpoint->set)
1460                         cortex_m_set_watchpoint(target, watchpoint);
1461                 watchpoint = watchpoint->next;
1462         }
1463 }
1464
1465 static int cortex_m_load_core_reg_u32(struct target *target,
1466                 uint32_t num, uint32_t *value)
1467 {
1468         int retval;
1469
1470         /* NOTE:  we "know" here that the register identifiers used
1471          * in the v7m header match the Cortex-M3 Debug Core Register
1472          * Selector values for R0..R15, xPSR, MSP, and PSP.
1473          */
1474         switch (num) {
1475                 case 0 ... 18:
1476                         /* read a normal core register */
1477                         retval = cortexm_dap_read_coreregister_u32(target, value, num);
1478
1479                         if (retval != ERROR_OK) {
1480                                 LOG_ERROR("JTAG failure %i", retval);
1481                                 return ERROR_JTAG_DEVICE_ERROR;
1482                         }
1483                         LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "", (int)num, *value);
1484                         break;
1485
1486                 case ARMV7M_FPSCR:
1487                         /* Floating-point Status and Registers */
1488                         retval = target_write_u32(target, DCB_DCRSR, 0x21);
1489                         if (retval != ERROR_OK)
1490                                 return retval;
1491                         retval = target_read_u32(target, DCB_DCRDR, value);
1492                         if (retval != ERROR_OK)
1493                                 return retval;
1494                         LOG_DEBUG("load from FPSCR  value 0x%" PRIx32, *value);
1495                         break;
1496
1497                 case ARMV7M_S0 ... ARMV7M_S31:
1498                         /* Floating-point Status and Registers */
1499                         retval = target_write_u32(target, DCB_DCRSR, num - ARMV7M_S0 + 0x40);
1500                         if (retval != ERROR_OK)
1501                                 return retval;
1502                         retval = target_read_u32(target, DCB_DCRDR, value);
1503                         if (retval != ERROR_OK)
1504                                 return retval;
1505                         LOG_DEBUG("load from FPU reg S%d  value 0x%" PRIx32,
1506                                   (int)(num - ARMV7M_S0), *value);
1507                         break;
1508
1509                 case ARMV7M_PRIMASK:
1510                 case ARMV7M_BASEPRI:
1511                 case ARMV7M_FAULTMASK:
1512                 case ARMV7M_CONTROL:
1513                         /* Cortex-M3 packages these four registers as bitfields
1514                          * in one Debug Core register.  So say r0 and r2 docs;
1515                          * it was removed from r1 docs, but still works.
1516                          */
1517                         cortexm_dap_read_coreregister_u32(target, value, 20);
1518
1519                         switch (num) {
1520                                 case ARMV7M_PRIMASK:
1521                                         *value = buf_get_u32((uint8_t *)value, 0, 1);
1522                                         break;
1523
1524                                 case ARMV7M_BASEPRI:
1525                                         *value = buf_get_u32((uint8_t *)value, 8, 8);
1526                                         break;
1527
1528                                 case ARMV7M_FAULTMASK:
1529                                         *value = buf_get_u32((uint8_t *)value, 16, 1);
1530                                         break;
1531
1532                                 case ARMV7M_CONTROL:
1533                                         *value = buf_get_u32((uint8_t *)value, 24, 2);
1534                                         break;
1535                         }
1536
1537                         LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "", (int)num, *value);
1538                         break;
1539
1540                 default:
1541                         return ERROR_COMMAND_SYNTAX_ERROR;
1542         }
1543
1544         return ERROR_OK;
1545 }
1546
1547 static int cortex_m_store_core_reg_u32(struct target *target,
1548                 uint32_t num, uint32_t value)
1549 {
1550         int retval;
1551         uint32_t reg;
1552         struct armv7m_common *armv7m = target_to_armv7m(target);
1553
1554         /* NOTE:  we "know" here that the register identifiers used
1555          * in the v7m header match the Cortex-M3 Debug Core Register
1556          * Selector values for R0..R15, xPSR, MSP, and PSP.
1557          */
1558         switch (num) {
1559                 case 0 ... 18:
1560                         retval = cortexm_dap_write_coreregister_u32(target, value, num);
1561                         if (retval != ERROR_OK) {
1562                                 struct reg *r;
1563
1564                                 LOG_ERROR("JTAG failure");
1565                                 r = armv7m->arm.core_cache->reg_list + num;
1566                                 r->dirty = r->valid;
1567                                 return ERROR_JTAG_DEVICE_ERROR;
1568                         }
1569                         LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
1570                         break;
1571
1572                 case ARMV7M_FPSCR:
1573                         /* Floating-point Status and Registers */
1574                         retval = target_write_u32(target, DCB_DCRDR, value);
1575                         if (retval != ERROR_OK)
1576                                 return retval;
1577                         retval = target_write_u32(target, DCB_DCRSR, 0x21 | (1<<16));
1578                         if (retval != ERROR_OK)
1579                                 return retval;
1580                         LOG_DEBUG("write FPSCR value 0x%" PRIx32, value);
1581                         break;
1582
1583                 case ARMV7M_S0 ... ARMV7M_S31:
1584                         /* Floating-point Status and Registers */
1585                         retval = target_write_u32(target, DCB_DCRDR, value);
1586                         if (retval != ERROR_OK)
1587                                 return retval;
1588                         retval = target_write_u32(target, DCB_DCRSR, (num - ARMV7M_S0 + 0x40) | (1<<16));
1589                         if (retval != ERROR_OK)
1590                                 return retval;
1591                         LOG_DEBUG("write FPU reg S%d  value 0x%" PRIx32,
1592                                   (int)(num - ARMV7M_S0), value);
1593                         break;
1594
1595                 case ARMV7M_PRIMASK:
1596                 case ARMV7M_BASEPRI:
1597                 case ARMV7M_FAULTMASK:
1598                 case ARMV7M_CONTROL:
1599                         /* Cortex-M3 packages these four registers as bitfields
1600                          * in one Debug Core register.  So say r0 and r2 docs;
1601                          * it was removed from r1 docs, but still works.
1602                          */
1603                         cortexm_dap_read_coreregister_u32(target, &reg, 20);
1604
1605                         switch (num) {
1606                                 case ARMV7M_PRIMASK:
1607                                         buf_set_u32((uint8_t *)&reg, 0, 1, value);
1608                                         break;
1609
1610                                 case ARMV7M_BASEPRI:
1611                                         buf_set_u32((uint8_t *)&reg, 8, 8, value);
1612                                         break;
1613
1614                                 case ARMV7M_FAULTMASK:
1615                                         buf_set_u32((uint8_t *)&reg, 16, 1, value);
1616                                         break;
1617
1618                                 case ARMV7M_CONTROL:
1619                                         buf_set_u32((uint8_t *)&reg, 24, 2, value);
1620                                         break;
1621                         }
1622
1623                         cortexm_dap_write_coreregister_u32(target, reg, 20);
1624
1625                         LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value);
1626                         break;
1627
1628                 default:
1629                         return ERROR_COMMAND_SYNTAX_ERROR;
1630         }
1631
1632         return ERROR_OK;
1633 }
1634
1635 static int cortex_m_read_memory(struct target *target, target_addr_t address,
1636         uint32_t size, uint32_t count, uint8_t *buffer)
1637 {
1638         struct armv7m_common *armv7m = target_to_armv7m(target);
1639
1640         if (armv7m->arm.is_armv6m) {
1641                 /* armv6m does not handle unaligned memory access */
1642                 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
1643                         return ERROR_TARGET_UNALIGNED_ACCESS;
1644         }
1645
1646         return mem_ap_read_buf(armv7m->debug_ap, buffer, size, count, address);
1647 }
1648
1649 static int cortex_m_write_memory(struct target *target, target_addr_t address,
1650         uint32_t size, uint32_t count, const uint8_t *buffer)
1651 {
1652         struct armv7m_common *armv7m = target_to_armv7m(target);
1653
1654         if (armv7m->arm.is_armv6m) {
1655                 /* armv6m does not handle unaligned memory access */
1656                 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
1657                         return ERROR_TARGET_UNALIGNED_ACCESS;
1658         }
1659
1660         return mem_ap_write_buf(armv7m->debug_ap, buffer, size, count, address);
1661 }
1662
1663 static int cortex_m_init_target(struct command_context *cmd_ctx,
1664         struct target *target)
1665 {
1666         armv7m_build_reg_cache(target);
1667         arm_semihosting_init(target);
1668         return ERROR_OK;
1669 }
1670
1671 void cortex_m_deinit_target(struct target *target)
1672 {
1673         struct cortex_m_common *cortex_m = target_to_cm(target);
1674
1675         free(cortex_m->fp_comparator_list);
1676
1677         cortex_m_dwt_free(target);
1678         armv7m_free_reg_cache(target);
1679
1680         free(target->private_config);
1681         free(cortex_m);
1682 }
1683
1684 int cortex_m_profiling(struct target *target, uint32_t *samples,
1685                               uint32_t max_num_samples, uint32_t *num_samples, uint32_t seconds)
1686 {
1687         struct timeval timeout, now;
1688         struct armv7m_common *armv7m = target_to_armv7m(target);
1689         uint32_t reg_value;
1690         bool use_pcsr = false;
1691         int retval = ERROR_OK;
1692         struct reg *reg;
1693
1694         gettimeofday(&timeout, NULL);
1695         timeval_add_time(&timeout, seconds, 0);
1696
1697         retval = target_read_u32(target, DWT_PCSR, &reg_value);
1698         if (retval != ERROR_OK) {
1699                 LOG_ERROR("Error while reading PCSR");
1700                 return retval;
1701         }
1702
1703         if (reg_value != 0) {
1704                 use_pcsr = true;
1705                 LOG_INFO("Starting Cortex-M profiling. Sampling DWT_PCSR as fast as we can...");
1706         } else {
1707                 LOG_INFO("Starting profiling. Halting and resuming the"
1708                          " target as often as we can...");
1709                 reg = register_get_by_name(target->reg_cache, "pc", 1);
1710         }
1711
1712         /* Make sure the target is running */
1713         target_poll(target);
1714         if (target->state == TARGET_HALTED)
1715                 retval = target_resume(target, 1, 0, 0, 0);
1716
1717         if (retval != ERROR_OK) {
1718                 LOG_ERROR("Error while resuming target");
1719                 return retval;
1720         }
1721
1722         uint32_t sample_count = 0;
1723
1724         for (;;) {
1725                 if (use_pcsr) {
1726                         if (armv7m && armv7m->debug_ap) {
1727                                 uint32_t read_count = max_num_samples - sample_count;
1728                                 if (read_count > 1024)
1729                                         read_count = 1024;
1730
1731                                 retval = mem_ap_read_buf_noincr(armv7m->debug_ap,
1732                                                         (void *)&samples[sample_count],
1733                                                         4, read_count, DWT_PCSR);
1734                                 sample_count += read_count;
1735                         } else {
1736                                 target_read_u32(target, DWT_PCSR, &samples[sample_count++]);
1737                         }
1738                 } else {
1739                         target_poll(target);
1740                         if (target->state == TARGET_HALTED) {
1741                                 reg_value = buf_get_u32(reg->value, 0, 32);
1742                                 /* current pc, addr = 0, do not handle breakpoints, not debugging */
1743                                 retval = target_resume(target, 1, 0, 0, 0);
1744                                 samples[sample_count++] = reg_value;
1745                                 target_poll(target);
1746                                 alive_sleep(10); /* sleep 10ms, i.e. <100 samples/second. */
1747                         } else if (target->state == TARGET_RUNNING) {
1748                                 /* We want to quickly sample the PC. */
1749                                 retval = target_halt(target);
1750                         } else {
1751                                 LOG_INFO("Target not halted or running");
1752                                 retval = ERROR_OK;
1753                                 break;
1754                         }
1755                 }
1756
1757                 if (retval != ERROR_OK) {
1758                         LOG_ERROR("Error while reading %s", use_pcsr ? "PCSR" : "target pc");
1759                         return retval;
1760                 }
1761
1762
1763                 gettimeofday(&now, NULL);
1764                 if (sample_count >= max_num_samples || timeval_compare(&now, &timeout) > 0) {
1765                         LOG_INFO("Profiling completed. %" PRIu32 " samples.", sample_count);
1766                         break;
1767                 }
1768         }
1769
1770         *num_samples = sample_count;
1771         return retval;
1772 }
1773
1774
1775 /* REVISIT cache valid/dirty bits are unmaintained.  We could set "valid"
1776  * on r/w if the core is not running, and clear on resume or reset ... or
1777  * at least, in a post_restore_context() method.
1778  */
1779
1780 struct dwt_reg_state {
1781         struct target *target;
1782         uint32_t addr;
1783         uint8_t value[4];               /* scratch/cache */
1784 };
1785
1786 static int cortex_m_dwt_get_reg(struct reg *reg)
1787 {
1788         struct dwt_reg_state *state = reg->arch_info;
1789
1790         uint32_t tmp;
1791         int retval = target_read_u32(state->target, state->addr, &tmp);
1792         if (retval != ERROR_OK)
1793                 return retval;
1794
1795         buf_set_u32(state->value, 0, 32, tmp);
1796         return ERROR_OK;
1797 }
1798
1799 static int cortex_m_dwt_set_reg(struct reg *reg, uint8_t *buf)
1800 {
1801         struct dwt_reg_state *state = reg->arch_info;
1802
1803         return target_write_u32(state->target, state->addr,
1804                         buf_get_u32(buf, 0, reg->size));
1805 }
1806
1807 struct dwt_reg {
1808         uint32_t addr;
1809         char *name;
1810         unsigned size;
1811 };
1812
1813 static struct dwt_reg dwt_base_regs[] = {
1814         { DWT_CTRL, "dwt_ctrl", 32, },
1815         /* NOTE that Erratum 532314 (fixed r2p0) affects CYCCNT:  it wrongly
1816          * increments while the core is asleep.
1817          */
1818         { DWT_CYCCNT, "dwt_cyccnt", 32, },
1819         /* plus some 8 bit counters, useful for profiling with TPIU */
1820 };
1821
1822 static struct dwt_reg dwt_comp[] = {
1823 #define DWT_COMPARATOR(i) \
1824                 { DWT_COMP0 + 0x10 * (i), "dwt_" #i "_comp", 32, }, \
1825                 { DWT_MASK0 + 0x10 * (i), "dwt_" #i "_mask", 4, }, \
1826                 { DWT_FUNCTION0 + 0x10 * (i), "dwt_" #i "_function", 32, }
1827         DWT_COMPARATOR(0),
1828         DWT_COMPARATOR(1),
1829         DWT_COMPARATOR(2),
1830         DWT_COMPARATOR(3),
1831         DWT_COMPARATOR(4),
1832         DWT_COMPARATOR(5),
1833         DWT_COMPARATOR(6),
1834         DWT_COMPARATOR(7),
1835         DWT_COMPARATOR(8),
1836         DWT_COMPARATOR(9),
1837         DWT_COMPARATOR(10),
1838         DWT_COMPARATOR(11),
1839         DWT_COMPARATOR(12),
1840         DWT_COMPARATOR(13),
1841         DWT_COMPARATOR(14),
1842         DWT_COMPARATOR(15),
1843 #undef DWT_COMPARATOR
1844 };
1845
1846 static const struct reg_arch_type dwt_reg_type = {
1847         .get = cortex_m_dwt_get_reg,
1848         .set = cortex_m_dwt_set_reg,
1849 };
1850
1851 static void cortex_m_dwt_addreg(struct target *t, struct reg *r, struct dwt_reg *d)
1852 {
1853         struct dwt_reg_state *state;
1854
1855         state = calloc(1, sizeof *state);
1856         if (!state)
1857                 return;
1858         state->addr = d->addr;
1859         state->target = t;
1860
1861         r->name = d->name;
1862         r->size = d->size;
1863         r->value = state->value;
1864         r->arch_info = state;
1865         r->type = &dwt_reg_type;
1866 }
1867
1868 void cortex_m_dwt_setup(struct cortex_m_common *cm, struct target *target)
1869 {
1870         uint32_t dwtcr;
1871         struct reg_cache *cache;
1872         struct cortex_m_dwt_comparator *comparator;
1873         int reg, i;
1874
1875         target_read_u32(target, DWT_CTRL, &dwtcr);
1876         LOG_DEBUG("DWT_CTRL: 0x%" PRIx32, dwtcr);
1877         if (!dwtcr) {
1878                 LOG_DEBUG("no DWT");
1879                 return;
1880         }
1881
1882         cm->dwt_num_comp = (dwtcr >> 28) & 0xF;
1883         cm->dwt_comp_available = cm->dwt_num_comp;
1884         cm->dwt_comparator_list = calloc(cm->dwt_num_comp,
1885                         sizeof(struct cortex_m_dwt_comparator));
1886         if (!cm->dwt_comparator_list) {
1887 fail0:
1888                 cm->dwt_num_comp = 0;
1889                 LOG_ERROR("out of mem");
1890                 return;
1891         }
1892
1893         cache = calloc(1, sizeof *cache);
1894         if (!cache) {
1895 fail1:
1896                 free(cm->dwt_comparator_list);
1897                 goto fail0;
1898         }
1899         cache->name = "Cortex-M DWT registers";
1900         cache->num_regs = 2 + cm->dwt_num_comp * 3;
1901         cache->reg_list = calloc(cache->num_regs, sizeof *cache->reg_list);
1902         if (!cache->reg_list) {
1903                 free(cache);
1904                 goto fail1;
1905         }
1906
1907         for (reg = 0; reg < 2; reg++)
1908                 cortex_m_dwt_addreg(target, cache->reg_list + reg,
1909                         dwt_base_regs + reg);
1910
1911         comparator = cm->dwt_comparator_list;
1912         for (i = 0; i < cm->dwt_num_comp; i++, comparator++) {
1913                 int j;
1914
1915                 comparator->dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1916                 for (j = 0; j < 3; j++, reg++)
1917                         cortex_m_dwt_addreg(target, cache->reg_list + reg,
1918                                 dwt_comp + 3 * i + j);
1919
1920                 /* make sure we clear any watchpoints enabled on the target */
1921                 target_write_u32(target, comparator->dwt_comparator_address + 8, 0);
1922         }
1923
1924         *register_get_last_cache_p(&target->reg_cache) = cache;
1925         cm->dwt_cache = cache;
1926
1927         LOG_DEBUG("DWT dwtcr 0x%" PRIx32 ", comp %d, watch%s",
1928                 dwtcr, cm->dwt_num_comp,
1929                 (dwtcr & (0xf << 24)) ? " only" : "/trigger");
1930
1931         /* REVISIT:  if num_comp > 1, check whether comparator #1 can
1932          * implement single-address data value watchpoints ... so we
1933          * won't need to check it later, when asked to set one up.
1934          */
1935 }
1936
1937 static void cortex_m_dwt_free(struct target *target)
1938 {
1939         struct cortex_m_common *cm = target_to_cm(target);
1940         struct reg_cache *cache = cm->dwt_cache;
1941
1942         free(cm->dwt_comparator_list);
1943         cm->dwt_comparator_list = NULL;
1944         cm->dwt_num_comp = 0;
1945
1946         if (cache) {
1947                 register_unlink_cache(&target->reg_cache, cache);
1948
1949                 if (cache->reg_list) {
1950                         for (size_t i = 0; i < cache->num_regs; i++)
1951                                 free(cache->reg_list[i].arch_info);
1952                         free(cache->reg_list);
1953                 }
1954                 free(cache);
1955         }
1956         cm->dwt_cache = NULL;
1957 }
1958
1959 #define MVFR0 0xe000ef40
1960 #define MVFR1 0xe000ef44
1961
1962 #define MVFR0_DEFAULT_M4 0x10110021
1963 #define MVFR1_DEFAULT_M4 0x11000011
1964
1965 #define MVFR0_DEFAULT_M7_SP 0x10110021
1966 #define MVFR0_DEFAULT_M7_DP 0x10110221
1967 #define MVFR1_DEFAULT_M7_SP 0x11000011
1968 #define MVFR1_DEFAULT_M7_DP 0x12000011
1969
1970 int cortex_m_examine(struct target *target)
1971 {
1972         int retval;
1973         uint32_t cpuid, fpcr, mvfr0, mvfr1;
1974         int i;
1975         struct cortex_m_common *cortex_m = target_to_cm(target);
1976         struct adiv5_dap *swjdp = cortex_m->armv7m.arm.dap;
1977         struct armv7m_common *armv7m = target_to_armv7m(target);
1978
1979         /* stlink shares the examine handler but does not support
1980          * all its calls */
1981         if (!armv7m->stlink) {
1982                 if (cortex_m->apsel < 0) {
1983                         /* Search for the MEM-AP */
1984                         retval = dap_find_ap(swjdp, AP_TYPE_AHB_AP, &armv7m->debug_ap);
1985                         if (retval != ERROR_OK) {
1986                                 LOG_ERROR("Could not find MEM-AP to control the core");
1987                                 return retval;
1988                         }
1989                 } else {
1990                         armv7m->debug_ap = dap_ap(swjdp, cortex_m->apsel);
1991                 }
1992
1993                 /* Leave (only) generic DAP stuff for debugport_init(); */
1994                 armv7m->debug_ap->memaccess_tck = 8;
1995
1996                 retval = mem_ap_init(armv7m->debug_ap);
1997                 if (retval != ERROR_OK)
1998                         return retval;
1999         }
2000
2001         if (!target_was_examined(target)) {
2002                 target_set_examined(target);
2003
2004                 /* Read from Device Identification Registers */
2005                 retval = target_read_u32(target, CPUID, &cpuid);
2006                 if (retval != ERROR_OK)
2007                         return retval;
2008
2009                 /* Get CPU Type */
2010                 i = (cpuid >> 4) & 0xf;
2011
2012                 LOG_DEBUG("Cortex-M%d r%" PRId8 "p%" PRId8 " processor detected",
2013                                 i, (uint8_t)((cpuid >> 20) & 0xf), (uint8_t)((cpuid >> 0) & 0xf));
2014                 if (i == 7) {
2015                         uint8_t rev, patch;
2016                         rev = (cpuid >> 20) & 0xf;
2017                         patch = (cpuid >> 0) & 0xf;
2018                         if ((rev == 0) && (patch < 2))
2019                                 LOG_WARNING("Silicon bug: single stepping will enter pending exception handler!");
2020                 }
2021                 LOG_DEBUG("cpuid: 0x%8.8" PRIx32 "", cpuid);
2022
2023                 if (i == 4) {
2024                         target_read_u32(target, MVFR0, &mvfr0);
2025                         target_read_u32(target, MVFR1, &mvfr1);
2026
2027                         /* test for floating point feature on Cortex-M4 */
2028                         if ((mvfr0 == MVFR0_DEFAULT_M4) && (mvfr1 == MVFR1_DEFAULT_M4)) {
2029                                 LOG_DEBUG("Cortex-M%d floating point feature FPv4_SP found", i);
2030                                 armv7m->fp_feature = FPv4_SP;
2031                         }
2032                 } else if (i == 7) {
2033                         target_read_u32(target, MVFR0, &mvfr0);
2034                         target_read_u32(target, MVFR1, &mvfr1);
2035
2036                         /* test for floating point features on Cortex-M7 */
2037                         if ((mvfr0 == MVFR0_DEFAULT_M7_SP) && (mvfr1 == MVFR1_DEFAULT_M7_SP)) {
2038                                 LOG_DEBUG("Cortex-M%d floating point feature FPv5_SP found", i);
2039                                 armv7m->fp_feature = FPv5_SP;
2040                         } else if ((mvfr0 == MVFR0_DEFAULT_M7_DP) && (mvfr1 == MVFR1_DEFAULT_M7_DP)) {
2041                                 LOG_DEBUG("Cortex-M%d floating point feature FPv5_DP found", i);
2042                                 armv7m->fp_feature = FPv5_DP;
2043                         }
2044                 } else if (i == 0) {
2045                         /* Cortex-M0 does not support unaligned memory access */
2046                         armv7m->arm.is_armv6m = true;
2047                 }
2048
2049                 if (armv7m->fp_feature == FP_NONE &&
2050                     armv7m->arm.core_cache->num_regs > ARMV7M_NUM_CORE_REGS_NOFP) {
2051                         /* free unavailable FPU registers */
2052                         size_t idx;
2053
2054                         for (idx = ARMV7M_NUM_CORE_REGS_NOFP;
2055                              idx < armv7m->arm.core_cache->num_regs;
2056                              idx++) {
2057                                 free(armv7m->arm.core_cache->reg_list[idx].value);
2058                                 free(armv7m->arm.core_cache->reg_list[idx].feature);
2059                                 free(armv7m->arm.core_cache->reg_list[idx].reg_data_type);
2060                         }
2061                         armv7m->arm.core_cache->num_regs = ARMV7M_NUM_CORE_REGS_NOFP;
2062                 }
2063
2064                 if (!armv7m->stlink) {
2065                         if (i == 3 || i == 4)
2066                                 /* Cortex-M3/M4 have 4096 bytes autoincrement range,
2067                                  * s. ARM IHI 0031C: MEM-AP 7.2.2 */
2068                                 armv7m->debug_ap->tar_autoincr_block = (1 << 12);
2069                         else if (i == 7)
2070                                 /* Cortex-M7 has only 1024 bytes autoincrement range */
2071                                 armv7m->debug_ap->tar_autoincr_block = (1 << 10);
2072                 }
2073
2074                 /* Configure trace modules */
2075                 retval = target_write_u32(target, DCB_DEMCR, TRCENA | armv7m->demcr);
2076                 if (retval != ERROR_OK)
2077                         return retval;
2078
2079                 if (armv7m->trace_config.config_type != DISABLED) {
2080                         armv7m_trace_tpiu_config(target);
2081                         armv7m_trace_itm_config(target);
2082                 }
2083
2084                 /* NOTE: FPB and DWT are both optional. */
2085
2086                 /* Setup FPB */
2087                 target_read_u32(target, FP_CTRL, &fpcr);
2088                 /* bits [14:12] and [7:4] */
2089                 cortex_m->fp_num_code = ((fpcr >> 8) & 0x70) | ((fpcr >> 4) & 0xF);
2090                 cortex_m->fp_num_lit = (fpcr >> 8) & 0xF;
2091                 cortex_m->fp_code_available = cortex_m->fp_num_code;
2092                 /* Detect flash patch revision, see RM DDI 0403E.b page C1-817.
2093                    Revision is zero base, fp_rev == 1 means Rev.2 ! */
2094                 cortex_m->fp_rev = (fpcr >> 28) & 0xf;
2095                 free(cortex_m->fp_comparator_list);
2096                 cortex_m->fp_comparator_list = calloc(
2097                                 cortex_m->fp_num_code + cortex_m->fp_num_lit,
2098                                 sizeof(struct cortex_m_fp_comparator));
2099                 cortex_m->fpb_enabled = fpcr & 1;
2100                 for (i = 0; i < cortex_m->fp_num_code + cortex_m->fp_num_lit; i++) {
2101                         cortex_m->fp_comparator_list[i].type =
2102                                 (i < cortex_m->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
2103                         cortex_m->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
2104
2105                         /* make sure we clear any breakpoints enabled on the target */
2106                         target_write_u32(target, cortex_m->fp_comparator_list[i].fpcr_address, 0);
2107                 }
2108                 LOG_DEBUG("FPB fpcr 0x%" PRIx32 ", numcode %i, numlit %i",
2109                         fpcr,
2110                         cortex_m->fp_num_code,
2111                         cortex_m->fp_num_lit);
2112
2113                 /* Setup DWT */
2114                 cortex_m_dwt_free(target);
2115                 cortex_m_dwt_setup(cortex_m, target);
2116
2117                 /* These hardware breakpoints only work for code in flash! */
2118                 LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
2119                         target_name(target),
2120                         cortex_m->fp_num_code,
2121                         cortex_m->dwt_num_comp);
2122         }
2123
2124         return ERROR_OK;
2125 }
2126
2127 static int cortex_m_dcc_read(struct target *target, uint8_t *value, uint8_t *ctrl)
2128 {
2129         struct armv7m_common *armv7m = target_to_armv7m(target);
2130         uint16_t dcrdr;
2131         uint8_t buf[2];
2132         int retval;
2133
2134         retval = mem_ap_read_buf_noincr(armv7m->debug_ap, buf, 2, 1, DCB_DCRDR);
2135         if (retval != ERROR_OK)
2136                 return retval;
2137
2138         dcrdr = target_buffer_get_u16(target, buf);
2139         *ctrl = (uint8_t)dcrdr;
2140         *value = (uint8_t)(dcrdr >> 8);
2141
2142         LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
2143
2144         /* write ack back to software dcc register
2145          * signify we have read data */
2146         if (dcrdr & (1 << 0)) {
2147                 target_buffer_set_u16(target, buf, 0);
2148                 retval = mem_ap_write_buf_noincr(armv7m->debug_ap, buf, 2, 1, DCB_DCRDR);
2149                 if (retval != ERROR_OK)
2150                         return retval;
2151         }
2152
2153         return ERROR_OK;
2154 }
2155
2156 static int cortex_m_target_request_data(struct target *target,
2157         uint32_t size, uint8_t *buffer)
2158 {
2159         uint8_t data;
2160         uint8_t ctrl;
2161         uint32_t i;
2162
2163         for (i = 0; i < (size * 4); i++) {
2164                 int retval = cortex_m_dcc_read(target, &data, &ctrl);
2165                 if (retval != ERROR_OK)
2166                         return retval;
2167                 buffer[i] = data;
2168         }
2169
2170         return ERROR_OK;
2171 }
2172
2173 static int cortex_m_handle_target_request(void *priv)
2174 {
2175         struct target *target = priv;
2176         if (!target_was_examined(target))
2177                 return ERROR_OK;
2178
2179         if (!target->dbg_msg_enabled)
2180                 return ERROR_OK;
2181
2182         if (target->state == TARGET_RUNNING) {
2183                 uint8_t data;
2184                 uint8_t ctrl;
2185                 int retval;
2186
2187                 retval = cortex_m_dcc_read(target, &data, &ctrl);
2188                 if (retval != ERROR_OK)
2189                         return retval;
2190
2191                 /* check if we have data */
2192                 if (ctrl & (1 << 0)) {
2193                         uint32_t request;
2194
2195                         /* we assume target is quick enough */
2196                         request = data;
2197                         for (int i = 1; i <= 3; i++) {
2198                                 retval = cortex_m_dcc_read(target, &data, &ctrl);
2199                                 if (retval != ERROR_OK)
2200                                         return retval;
2201                                 request |= ((uint32_t)data << (i * 8));
2202                         }
2203                         target_request(target, request);
2204                 }
2205         }
2206
2207         return ERROR_OK;
2208 }
2209
2210 static int cortex_m_init_arch_info(struct target *target,
2211         struct cortex_m_common *cortex_m, struct adiv5_dap *dap)
2212 {
2213         struct armv7m_common *armv7m = &cortex_m->armv7m;
2214
2215         armv7m_init_arch_info(target, armv7m);
2216
2217         /* default reset mode is to use srst if fitted
2218          * if not it will use CORTEX_M3_RESET_VECTRESET */
2219         cortex_m->soft_reset_config = CORTEX_M_RESET_VECTRESET;
2220
2221         armv7m->arm.dap = dap;
2222
2223         /* register arch-specific functions */
2224         armv7m->examine_debug_reason = cortex_m_examine_debug_reason;
2225
2226         armv7m->post_debug_entry = NULL;
2227
2228         armv7m->pre_restore_context = NULL;
2229
2230         armv7m->load_core_reg_u32 = cortex_m_load_core_reg_u32;
2231         armv7m->store_core_reg_u32 = cortex_m_store_core_reg_u32;
2232
2233         target_register_timer_callback(cortex_m_handle_target_request, 1, 1, target);
2234
2235         return ERROR_OK;
2236 }
2237
2238 static int cortex_m_target_create(struct target *target, Jim_Interp *interp)
2239 {
2240         struct cortex_m_common *cortex_m = calloc(1, sizeof(struct cortex_m_common));
2241         cortex_m->common_magic = CORTEX_M_COMMON_MAGIC;
2242         struct adiv5_private_config *pc;
2243
2244         pc = (struct adiv5_private_config *)target->private_config;
2245         if (adiv5_verify_config(pc) != ERROR_OK)
2246                 return ERROR_FAIL;
2247
2248         cortex_m->apsel = pc->ap_num;
2249
2250         cortex_m_init_arch_info(target, cortex_m, pc->dap);
2251
2252         return ERROR_OK;
2253 }
2254
2255 /*--------------------------------------------------------------------------*/
2256
2257 static int cortex_m_verify_pointer(struct command_context *cmd_ctx,
2258         struct cortex_m_common *cm)
2259 {
2260         if (cm->common_magic != CORTEX_M_COMMON_MAGIC) {
2261                 command_print(cmd_ctx, "target is not a Cortex-M");
2262                 return ERROR_TARGET_INVALID;
2263         }
2264         return ERROR_OK;
2265 }
2266
2267 /*
2268  * Only stuff below this line should need to verify that its target
2269  * is a Cortex-M3.  Everything else should have indirected through the
2270  * cortexm3_target structure, which is only used with CM3 targets.
2271  */
2272
2273 static const struct {
2274         char name[10];
2275         unsigned mask;
2276 } vec_ids[] = {
2277         { "hard_err",   VC_HARDERR, },
2278         { "int_err",    VC_INTERR, },
2279         { "bus_err",    VC_BUSERR, },
2280         { "state_err",  VC_STATERR, },
2281         { "chk_err",    VC_CHKERR, },
2282         { "nocp_err",   VC_NOCPERR, },
2283         { "mm_err",     VC_MMERR, },
2284         { "reset",      VC_CORERESET, },
2285 };
2286
2287 COMMAND_HANDLER(handle_cortex_m_vector_catch_command)
2288 {
2289         struct target *target = get_current_target(CMD_CTX);
2290         struct cortex_m_common *cortex_m = target_to_cm(target);
2291         struct armv7m_common *armv7m = &cortex_m->armv7m;
2292         uint32_t demcr = 0;
2293         int retval;
2294
2295         retval = cortex_m_verify_pointer(CMD_CTX, cortex_m);
2296         if (retval != ERROR_OK)
2297                 return retval;
2298
2299         retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &demcr);
2300         if (retval != ERROR_OK)
2301                 return retval;
2302
2303         if (CMD_ARGC > 0) {
2304                 unsigned catch = 0;
2305
2306                 if (CMD_ARGC == 1) {
2307                         if (strcmp(CMD_ARGV[0], "all") == 0) {
2308                                 catch = VC_HARDERR | VC_INTERR | VC_BUSERR
2309                                         | VC_STATERR | VC_CHKERR | VC_NOCPERR
2310                                         | VC_MMERR | VC_CORERESET;
2311                                 goto write;
2312                         } else if (strcmp(CMD_ARGV[0], "none") == 0)
2313                                 goto write;
2314                 }
2315                 while (CMD_ARGC-- > 0) {
2316                         unsigned i;
2317                         for (i = 0; i < ARRAY_SIZE(vec_ids); i++) {
2318                                 if (strcmp(CMD_ARGV[CMD_ARGC], vec_ids[i].name) != 0)
2319                                         continue;
2320                                 catch |= vec_ids[i].mask;
2321                                 break;
2322                         }
2323                         if (i == ARRAY_SIZE(vec_ids)) {
2324                                 LOG_ERROR("No CM3 vector '%s'", CMD_ARGV[CMD_ARGC]);
2325                                 return ERROR_COMMAND_SYNTAX_ERROR;
2326                         }
2327                 }
2328 write:
2329                 /* For now, armv7m->demcr only stores vector catch flags. */
2330                 armv7m->demcr = catch;
2331
2332                 demcr &= ~0xffff;
2333                 demcr |= catch;
2334
2335                 /* write, but don't assume it stuck (why not??) */
2336                 retval = mem_ap_write_u32(armv7m->debug_ap, DCB_DEMCR, demcr);
2337                 if (retval != ERROR_OK)
2338                         return retval;
2339                 retval = mem_ap_read_atomic_u32(armv7m->debug_ap, DCB_DEMCR, &demcr);
2340                 if (retval != ERROR_OK)
2341                         return retval;
2342
2343                 /* FIXME be sure to clear DEMCR on clean server shutdown.
2344                  * Otherwise the vector catch hardware could fire when there's
2345                  * no debugger hooked up, causing much confusion...
2346                  */
2347         }
2348
2349         for (unsigned i = 0; i < ARRAY_SIZE(vec_ids); i++) {
2350                 command_print(CMD_CTX, "%9s: %s", vec_ids[i].name,
2351                         (demcr & vec_ids[i].mask) ? "catch" : "ignore");
2352         }
2353
2354         return ERROR_OK;
2355 }
2356
2357 COMMAND_HANDLER(handle_cortex_m_mask_interrupts_command)
2358 {
2359         struct target *target = get_current_target(CMD_CTX);
2360         struct cortex_m_common *cortex_m = target_to_cm(target);
2361         int retval;
2362
2363         static const Jim_Nvp nvp_maskisr_modes[] = {
2364                 { .name = "auto", .value = CORTEX_M_ISRMASK_AUTO },
2365                 { .name = "off", .value = CORTEX_M_ISRMASK_OFF },
2366                 { .name = "on", .value = CORTEX_M_ISRMASK_ON },
2367                 { .name = NULL, .value = -1 },
2368         };
2369         const Jim_Nvp *n;
2370
2371
2372         retval = cortex_m_verify_pointer(CMD_CTX, cortex_m);
2373         if (retval != ERROR_OK)
2374                 return retval;
2375
2376         if (target->state != TARGET_HALTED) {
2377                 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
2378                 return ERROR_OK;
2379         }
2380
2381         if (CMD_ARGC > 0) {
2382                 n = Jim_Nvp_name2value_simple(nvp_maskisr_modes, CMD_ARGV[0]);
2383                 if (n->name == NULL)
2384                         return ERROR_COMMAND_SYNTAX_ERROR;
2385                 cortex_m->isrmasking_mode = n->value;
2386
2387
2388                 if (cortex_m->isrmasking_mode == CORTEX_M_ISRMASK_ON)
2389                         cortex_m_write_debug_halt_mask(target, C_HALT | C_MASKINTS, 0);
2390                 else
2391                         cortex_m_write_debug_halt_mask(target, C_HALT, C_MASKINTS);
2392         }
2393
2394         n = Jim_Nvp_value2name_simple(nvp_maskisr_modes, cortex_m->isrmasking_mode);
2395         command_print(CMD_CTX, "cortex_m interrupt mask %s", n->name);
2396
2397         return ERROR_OK;
2398 }
2399
2400 COMMAND_HANDLER(handle_cortex_m_reset_config_command)
2401 {
2402         struct target *target = get_current_target(CMD_CTX);
2403         struct cortex_m_common *cortex_m = target_to_cm(target);
2404         int retval;
2405         char *reset_config;
2406
2407         retval = cortex_m_verify_pointer(CMD_CTX, cortex_m);
2408         if (retval != ERROR_OK)
2409                 return retval;
2410
2411         if (CMD_ARGC > 0) {
2412                 if (strcmp(*CMD_ARGV, "sysresetreq") == 0)
2413                         cortex_m->soft_reset_config = CORTEX_M_RESET_SYSRESETREQ;
2414                 else if (strcmp(*CMD_ARGV, "vectreset") == 0)
2415                         cortex_m->soft_reset_config = CORTEX_M_RESET_VECTRESET;
2416         }
2417
2418         switch (cortex_m->soft_reset_config) {
2419                 case CORTEX_M_RESET_SYSRESETREQ:
2420                         reset_config = "sysresetreq";
2421                         break;
2422
2423                 case CORTEX_M_RESET_VECTRESET:
2424                         reset_config = "vectreset";
2425                         break;
2426
2427                 default:
2428                         reset_config = "unknown";
2429                         break;
2430         }
2431
2432         command_print(CMD_CTX, "cortex_m reset_config %s", reset_config);
2433
2434         return ERROR_OK;
2435 }
2436
2437 static const struct command_registration cortex_m_exec_command_handlers[] = {
2438         {
2439                 .name = "maskisr",
2440                 .handler = handle_cortex_m_mask_interrupts_command,
2441                 .mode = COMMAND_EXEC,
2442                 .help = "mask cortex_m interrupts",
2443                 .usage = "['auto'|'on'|'off']",
2444         },
2445         {
2446                 .name = "vector_catch",
2447                 .handler = handle_cortex_m_vector_catch_command,
2448                 .mode = COMMAND_EXEC,
2449                 .help = "configure hardware vectors to trigger debug entry",
2450                 .usage = "['all'|'none'|('bus_err'|'chk_err'|...)*]",
2451         },
2452         {
2453                 .name = "reset_config",
2454                 .handler = handle_cortex_m_reset_config_command,
2455                 .mode = COMMAND_ANY,
2456                 .help = "configure software reset handling",
2457                 .usage = "['srst'|'sysresetreq'|'vectreset']",
2458         },
2459         COMMAND_REGISTRATION_DONE
2460 };
2461 static const struct command_registration cortex_m_command_handlers[] = {
2462         {
2463                 .chain = armv7m_command_handlers,
2464         },
2465         {
2466                 .chain = armv7m_trace_command_handlers,
2467         },
2468         {
2469                 .name = "cortex_m",
2470                 .mode = COMMAND_EXEC,
2471                 .help = "Cortex-M command group",
2472                 .usage = "",
2473                 .chain = cortex_m_exec_command_handlers,
2474         },
2475         COMMAND_REGISTRATION_DONE
2476 };
2477
2478 struct target_type cortexm_target = {
2479         .name = "cortex_m",
2480         .deprecated_name = "cortex_m3",
2481
2482         .poll = cortex_m_poll,
2483         .arch_state = armv7m_arch_state,
2484
2485         .target_request_data = cortex_m_target_request_data,
2486
2487         .halt = cortex_m_halt,
2488         .resume = cortex_m_resume,
2489         .step = cortex_m_step,
2490
2491         .assert_reset = cortex_m_assert_reset,
2492         .deassert_reset = cortex_m_deassert_reset,
2493         .soft_reset_halt = cortex_m_soft_reset_halt,
2494
2495         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
2496
2497         .read_memory = cortex_m_read_memory,
2498         .write_memory = cortex_m_write_memory,
2499         .checksum_memory = armv7m_checksum_memory,
2500         .blank_check_memory = armv7m_blank_check_memory,
2501
2502         .run_algorithm = armv7m_run_algorithm,
2503         .start_algorithm = armv7m_start_algorithm,
2504         .wait_algorithm = armv7m_wait_algorithm,
2505
2506         .add_breakpoint = cortex_m_add_breakpoint,
2507         .remove_breakpoint = cortex_m_remove_breakpoint,
2508         .add_watchpoint = cortex_m_add_watchpoint,
2509         .remove_watchpoint = cortex_m_remove_watchpoint,
2510
2511         .commands = cortex_m_command_handlers,
2512         .target_create = cortex_m_target_create,
2513         .target_jim_configure = adiv5_jim_configure,
2514         .init_target = cortex_m_init_target,
2515         .examine = cortex_m_examine,
2516         .deinit_target = cortex_m_deinit_target,
2517
2518         .profiling = cortex_m_profiling,
2519 };