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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2006 by Magnus Lundin                                   *
   6  *   lundin@mlu.mine.nu                                                    *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "replacements.h"
  31
  32 #include "cortex_m3.h"
  33 #include "armv7m.h"
  34
  35 #include "register.h"
  36 #include "target.h"
  37 #include "target_request.h"
  38 #include "log.h"
  39 #include "jtag.h"
  40 #include "arm_jtag.h"
  41
  42 #include <stdlib.h>
  43 #include <string.h>
  44
  45 /* cli handling */
  46 int cortex_m3_register_commands(struct command_context_s *cmd_ctx);
  47
  48 /* forward declarations */
  49 void cortex_m3_enable_breakpoints(struct target_s *target);
  50 void cortex_m3_enable_watchpoints(struct target_s *target);
  51 int cortex_m3_target_create(struct target_s *target, Jim_Interp *interp);
  52 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  53 int cortex_m3_quit(void);
  54 int cortex_m3_load_core_reg_u32(target_t *target, enum armv7m_regtype type, u32 num, u32 *value);
  55 int cortex_m3_store_core_reg_u32(target_t *target, enum armv7m_regtype type, u32 num, u32 value);
  56 int cortex_m3_target_request_data(target_t *target, u32 size, u8 *buffer);
  57 int cortex_m3_examine(struct target_s *target);
  58
  59 #ifdef ARMV7_GDB_HACKS
  60 extern u8 armv7m_gdb_dummy_cpsr_value[];
  61 extern reg_t armv7m_gdb_dummy_cpsr_reg;
  62 #endif
  63
  64 target_type_t cortexm3_target =
  65 {
  66         .name = "cortex_m3",
  67
  68         .poll = cortex_m3_poll,
  69         .arch_state = armv7m_arch_state,
  70
  71         .target_request_data = cortex_m3_target_request_data,
  72
  73         .halt = cortex_m3_halt,
  74         .resume = cortex_m3_resume,
  75         .step = cortex_m3_step,
  76
  77         .assert_reset = cortex_m3_assert_reset,
  78         .deassert_reset = cortex_m3_deassert_reset,
  79         .soft_reset_halt = cortex_m3_soft_reset_halt,
  80
  81         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
  82
  83         .read_memory = cortex_m3_read_memory,
  84         .write_memory = cortex_m3_write_memory,
  85         .bulk_write_memory = cortex_m3_bulk_write_memory,
  86         .checksum_memory = armv7m_checksum_memory,
  87         .blank_check_memory = armv7m_blank_check_memory,
  88
  89         .run_algorithm = armv7m_run_algorithm,
  90
  91         .add_breakpoint = cortex_m3_add_breakpoint,
  92         .remove_breakpoint = cortex_m3_remove_breakpoint,
  93         .add_watchpoint = cortex_m3_add_watchpoint,
  94         .remove_watchpoint = cortex_m3_remove_watchpoint,
  95
  96         .register_commands = cortex_m3_register_commands,
  97         .target_create = cortex_m3_target_create,
  98         .init_target = cortex_m3_init_target,
  99         .examine = cortex_m3_examine,
 100         .quit = cortex_m3_quit
 101 };
 102
 103 int cortex_m3_clear_halt(target_t *target)
 104 {
 105         /* get pointers to arch-specific information */
 106         armv7m_common_t *armv7m = target->arch_info;
 107         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 108         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 109
 110         /* Read Debug Fault Status Register */
 111         ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 112         /* Write Debug Fault Status Register to enable processing to resume ?? Try with and without this !! */
 113         ahbap_write_system_atomic_u32(swjdp, NVIC_DFSR, cortex_m3->nvic_dfsr);
 114         LOG_DEBUG(" NVIC_DFSR 0x%x", cortex_m3->nvic_dfsr);
 115
 116         return ERROR_OK;
 117 }
 118
 119 int cortex_m3_single_step_core(target_t *target)
 120 {
 121         /* get pointers to arch-specific information */
 122         armv7m_common_t *armv7m = target->arch_info;
 123         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 124         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 125
 126         if (!(cortex_m3->dcb_dhcsr & C_MASKINTS))
 127                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN );
 128         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN );
 129         cortex_m3->dcb_dhcsr |= C_MASKINTS;
 130         LOG_DEBUG(" ");
 131         cortex_m3_clear_halt(target);
 132
 133         return ERROR_OK;
 134 }
 135
 136 int cortex_m3_exec_opcode(target_t *target,u32 opcode, int len /* MODE, r0_invalue, &r0_outvalue */ )
 137 {
 138         /* get pointers to arch-specific information */
 139         armv7m_common_t *armv7m = target->arch_info;
 140         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 141         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 142         u32 savedram;
 143         int retvalue;
 144
 145         ahbap_read_system_u32(swjdp, 0x20000000, &savedram);
 146         ahbap_write_system_u32(swjdp, 0x20000000, opcode);
 147         ahbap_write_coreregister_u32(swjdp, 0x20000000, 15);
 148         cortex_m3_single_step_core(target);
 149         armv7m->core_cache->reg_list[15].dirty = armv7m->core_cache->reg_list[15].valid;
 150         retvalue = ahbap_write_system_atomic_u32(swjdp, 0x20000000, savedram);
 151
 152         return retvalue;
 153 }
 154
 155 #if 0
 156 /* Enable interrupts */
 157 int cortex_m3_cpsie(target_t *target, u32 IF)
 158 {
 159         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSIE(IF), 2);
 160 }
 161
 162 /* Disable interrupts */
 163 int cortex_m3_cpsid(target_t *target, u32 IF)
 164 {
 165         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSID(IF), 2);
 166 }
 167 #endif
 168
 169 int cortex_m3_endreset_event(target_t *target)
 170 {
 171         int i;
 172         u32 dcb_demcr;
 173
 174         /* get pointers to arch-specific information */
 175         armv7m_common_t *armv7m = target->arch_info;
 176         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 177         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 178         cortex_m3_fp_comparator_t *fp_list = cortex_m3->fp_comparator_list;
 179         cortex_m3_dwt_comparator_t *dwt_list = cortex_m3->dwt_comparator_list;
 180
 181         ahbap_read_system_atomic_u32(swjdp, DCB_DEMCR, &dcb_demcr);
 182         LOG_DEBUG("DCB_DEMCR = 0x%8.8x",dcb_demcr);
 183
 184         ahbap_write_system_u32(swjdp, DCB_DCRDR, 0 );
 185
 186         /* Enable debug requests */
 187         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 188         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 189                 ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN );
 190         /* Enable trace and dwt */
 191         ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR );
 192         /* Monitor bus faults */
 193         ahbap_write_system_u32(swjdp, NVIC_SHCSR, SHCSR_BUSFAULTENA );
 194
 195         /* Enable FPB */
 196         target_write_u32(target, FP_CTRL, 3);
 197
 198         /* Restore FPB registers */
 199         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
 200         {
 201                 target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
 202         }
 203
 204         /* Restore DWT registers */
 205         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
 206         {
 207                 target_write_u32(target, dwt_list[i].dwt_comparator_address, dwt_list[i].comp);
 208                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x4, dwt_list[i].mask);
 209                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x8, dwt_list[i].function);
 210         }
 211         swjdp_transaction_endcheck(swjdp);
 212
 213         armv7m_invalidate_core_regs(target);
 214         return ERROR_OK;
 215 }
 216
 217 int cortex_m3_examine_debug_reason(target_t *target)
 218 {
 219         /* get pointers to arch-specific information */
 220         armv7m_common_t *armv7m = target->arch_info;
 221         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 222
 223         /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason */
 224         /* only check the debug reason if we don't know it already */
 225
 226         if ((target->debug_reason != DBG_REASON_DBGRQ)
 227                 && (target->debug_reason != DBG_REASON_SINGLESTEP))
 228         {
 229                 /*  INCOMPLETE */
 230
 231                 if (cortex_m3->nvic_dfsr & DFSR_BKPT)
 232                 {
 233                         target->debug_reason = DBG_REASON_BREAKPOINT;
 234                         if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 235                                 target->debug_reason = DBG_REASON_WPTANDBKPT;
 236                 }
 237                 else if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 238                         target->debug_reason = DBG_REASON_WATCHPOINT;
 239         }
 240
 241         return ERROR_OK;
 242 }
 243
 244 int cortex_m3_examine_exception_reason(target_t *target)
 245 {
 246         u32 shcsr, except_sr, cfsr = -1, except_ar = -1;
 247
 248         /* get pointers to arch-specific information */
 249         armv7m_common_t *armv7m = target->arch_info;
 250         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 251         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 252
 253         ahbap_read_system_u32(swjdp, NVIC_SHCSR, &shcsr);
 254         switch (armv7m->exception_number)
 255         {
 256                 case 2: /* NMI */
 257                         break;
 258                 case 3: /* Hard Fault */
 259                         ahbap_read_system_atomic_u32(swjdp, NVIC_HFSR, &except_sr);
 260                         if (except_sr & 0x40000000)
 261                         {
 262                                 ahbap_read_system_u32(swjdp, NVIC_CFSR, &cfsr);
 263                         }
 264                         break;
 265                 case 4: /* Memory Management */
 266                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 267                         ahbap_read_system_u32(swjdp, NVIC_MMFAR, &except_ar);
 268                         break;
 269                 case 5: /* Bus Fault */
 270                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 271                         ahbap_read_system_u32(swjdp, NVIC_BFAR, &except_ar);
 272                         break;
 273                 case 6: /* Usage Fault */
 274                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 275                         break;
 276                 case 11:        /* SVCall */
 277                         break;
 278                 case 12:        /* Debug Monitor */
 279                         ahbap_read_system_u32(swjdp, NVIC_DFSR, &except_sr);
 280                         break;
 281                 case 14:        /* PendSV */
 282                         break;
 283                 case 15:        /* SysTick */
 284                         break;
 285                 default:
 286                         except_sr = 0;
 287                         break;
 288         }
 289         swjdp_transaction_endcheck(swjdp);
 290         LOG_DEBUG("%s SHCSR 0x%x, SR 0x%x, CFSR 0x%x, AR 0x%x", armv7m_exception_string(armv7m->exception_number), \
 291                 shcsr, except_sr, cfsr, except_ar);
 292         return ERROR_OK;
 293 }
 294
 295 int cortex_m3_debug_entry(target_t *target)
 296 {
 297         int i;
 298         u32 xPSR;
 299         int retval;
 300
 301         /* get pointers to arch-specific information */
 302         armv7m_common_t *armv7m = target->arch_info;
 303         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 304         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 305
 306         LOG_DEBUG(" ");
 307         if (armv7m->pre_debug_entry)
 308                 armv7m->pre_debug_entry(target);
 309
 310         cortex_m3_clear_halt(target);
 311         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 312
 313         if ((retval = armv7m->examine_debug_reason(target)) != ERROR_OK)
 314                 return retval;
 315
 316         /* Examine target state and mode */
 317         /* First load register acessible through core debug port*/
 318         for (i = 0; i < ARMV7M_PRIMASK; i++)
 319         {
 320                 if (!armv7m->core_cache->reg_list[i].valid)
 321                         armv7m->read_core_reg(target, i);
 322         }
 323
 324         xPSR = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32);
 325
 326 #ifdef ARMV7_GDB_HACKS
 327         /* copy real xpsr reg for gdb, setting thumb bit */
 328         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 0, 32, xPSR);
 329         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 5, 1, 1);
 330         armv7m_gdb_dummy_cpsr_reg.valid = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 331         armv7m_gdb_dummy_cpsr_reg.dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty;
 332 #endif
 333
 334         /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
 335         if (xPSR & 0xf00)
 336         {
 337                 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 338                 cortex_m3_store_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 16, xPSR &~ 0xff);
 339         }
 340
 341         /* Now we can load SP core registers */
 342         for (i = ARMV7M_PRIMASK; i < ARMV7NUMCOREREGS; i++)
 343         {
 344                 if (!armv7m->core_cache->reg_list[i].valid)
 345                         armv7m->read_core_reg(target, i);
 346         }
 347
 348         /* Are we in an exception handler */
 349         if (xPSR & 0x1FF)
 350         {
 351                 armv7m->core_mode = ARMV7M_MODE_HANDLER;
 352                 armv7m->exception_number = (xPSR & 0x1FF);
 353         }
 354         else
 355         {
 356                 armv7m->core_mode = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value, 0, 1);
 357                 armv7m->exception_number = 0;
 358         }
 359
 360         if (armv7m->exception_number)
 361         {
 362                 cortex_m3_examine_exception_reason(target);
 363         }
 364
 365         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%x, target->state: %s",
 366                 armv7m_mode_strings[armv7m->core_mode],
 367                 *(u32*)(armv7m->core_cache->reg_list[15].value),
 368                 Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name);
 369
 370         if (armv7m->post_debug_entry)
 371                 armv7m->post_debug_entry(target);
 372
 373         return ERROR_OK;
 374 }
 375
 376 int cortex_m3_poll(target_t *target)
 377 {
 378         int retval;
 379         enum target_state prev_target_state = target->state;
 380
 381         /* get pointers to arch-specific information */
 382         armv7m_common_t *armv7m = target->arch_info;
 383         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 384         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 385
 386         /* Read from Debug Halting Control and Status Register */
 387         retval = ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 388         if (retval != ERROR_OK)
 389         {
 390                 target->state = TARGET_UNKNOWN;
 391                 return retval;
 392         }
 393
 394         if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 395         {
 396                 /* check if still in reset */
 397                 ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 398
 399                 if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 400                 {
 401                         target->state = TARGET_RESET;
 402                         return ERROR_OK;
 403                 }
 404         }
 405
 406         if (target->state == TARGET_RESET)
 407         {
 408                 /* Cannot switch context while running so endreset is called with target->state == TARGET_RESET */
 409                 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%x", cortex_m3->dcb_dhcsr);
 410                 cortex_m3_endreset_event(target);
 411                 target->state = TARGET_RUNNING;
 412                 prev_target_state = TARGET_RUNNING;
 413         }
 414
 415         if (cortex_m3->dcb_dhcsr & S_HALT)
 416         {
 417                 target->state = TARGET_HALTED;
 418
 419                 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET))
 420                 {
 421                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 422                                 return retval;
 423
 424                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 425                 }
 426                 if (prev_target_state == TARGET_DEBUG_RUNNING)
 427                 {
 428                         LOG_DEBUG(" ");
 429                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 430                                 return retval;
 431
 432                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 433                 }
 434         }
 435
 436         /*
 437         if (cortex_m3->dcb_dhcsr & S_SLEEP)
 438                 target->state = TARGET_SLEEP;
 439         */
 440
 441 #if 0
 442         /* Read Debug Fault Status Register, added to figure out the lockup when running flashtest.script  */
 443         ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 444         LOG_DEBUG("dcb_dhcsr 0x%x, nvic_dfsr 0x%x, target->state: %s", cortex_m3->dcb_dhcsr, cortex_m3->nvic_dfsr, Jim_Nvp_value2name( nvp_target_state, target->state )->name );
 445 #endif
 446
 447         return ERROR_OK;
 448 }
 449
 450 int cortex_m3_halt(target_t *target)
 451 {
 452         /* get pointers to arch-specific information */
 453         armv7m_common_t *armv7m = target->arch_info;
 454         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 455         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 456
 457         LOG_DEBUG("target->state: %s",
 458                 Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name );
 459
 460         if (target->state == TARGET_HALTED)
 461         {
 462                 LOG_DEBUG("target was already halted");
 463                 return ERROR_OK;
 464         }
 465
 466         if (target->state == TARGET_UNKNOWN)
 467         {
 468                 LOG_WARNING("target was in unknown state when halt was requested");
 469         }
 470
 471         if (target->state == TARGET_RESET)
 472         {
 473                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) && jtag_srst)
 474                 {
 475                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 476                         return ERROR_TARGET_FAILURE;
 477                 }
 478                 else
 479                 {
 480                         /* we came here in a reset_halt or reset_init sequence
 481                          * debug entry was already prepared in cortex_m3_prepare_reset_halt()
 482                          */
 483                         target->debug_reason = DBG_REASON_DBGRQ;
 484
 485                         return ERROR_OK;
 486                 }
 487         }
 488
 489         /* Write to Debug Halting Control and Status Register */
 490         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
 491
 492         target->debug_reason = DBG_REASON_DBGRQ;
 493
 494         return ERROR_OK;
 495 }
 496
 497 int cortex_m3_soft_reset_halt(struct target_s *target)
 498 {
 499         /* get pointers to arch-specific information */
 500         armv7m_common_t *armv7m = target->arch_info;
 501         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 502         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 503         u32 dcb_dhcsr = 0;
 504         int retval, timeout = 0;
 505
 506         /* Enter debug state on reset, cf. end_reset_event() */
 507         ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 508
 509         /* Request a reset */
 510         ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_VECTRESET );
 511         target->state = TARGET_RESET;
 512
 513         /* registers are now invalid */
 514         armv7m_invalidate_core_regs(target);
 515
 516         while (timeout < 100)
 517         {
 518                 retval = ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &dcb_dhcsr);
 519                 if (retval == ERROR_OK)
 520                 {
 521                         ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 522                         if ((dcb_dhcsr & S_HALT) && (cortex_m3->nvic_dfsr & DFSR_VCATCH))
 523                         {
 524                                 LOG_DEBUG("system reset-halted, dcb_dhcsr 0x%x, nvic_dfsr 0x%x", dcb_dhcsr, cortex_m3->nvic_dfsr);
 525                                 cortex_m3_poll(target);
 526                                 return ERROR_OK;
 527                         }
 528                         else
 529                                 LOG_DEBUG("waiting for system reset-halt, dcb_dhcsr 0x%x, %i ms", dcb_dhcsr, timeout);
 530                 }
 531                 timeout++;
 532                 alive_sleep(1);
 533         }
 534
 535         return ERROR_OK;
 536 }
 537
 538 int cortex_m3_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution)
 539 {
 540         /* get pointers to arch-specific information */
 541         armv7m_common_t *armv7m = target->arch_info;
 542         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 543         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 544         breakpoint_t *breakpoint = NULL;
 545         u32 dcb_dhcsr, resume_pc;
 546
 547         if (target->state != TARGET_HALTED)
 548         {
 549                 LOG_WARNING("target not halted");
 550                 return ERROR_TARGET_NOT_HALTED;
 551         }
 552
 553         if (!debug_execution)
 554         {
 555                 target_free_all_working_areas(target);
 556                 cortex_m3_enable_breakpoints(target);
 557                 cortex_m3_enable_watchpoints(target);
 558
 559                 /* TODOLATER Interrupt handling/disable for debug execution, cache ... ... */
 560         }
 561
 562         dcb_dhcsr = DBGKEY | C_DEBUGEN;
 563         if (debug_execution)
 564         {
 565                 /* Disable interrupts */
 566                 /* We disable interrupts in the PRIMASK register instead of masking with C_MASKINTS,
 567                  * This is probably the same inssue as Cortex-M3 Errata 377493:
 568                  * C_MASKINTS in parallel with disabled interrupts can cause local faults to not be taken. */
 569                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
 570                 /* Make sure we are in Thumb mode */
 571                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
 572                         buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1<<24));
 573         }
 574
 575         /* current = 1: continue on current pc, otherwise continue at <address> */
 576         if (!current)
 577         {
 578                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 579                 armv7m->core_cache->reg_list[15].dirty = 1;
 580                 armv7m->core_cache->reg_list[15].valid = 1;
 581         }
 582
 583         resume_pc = buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32);
 584
 585         armv7m_restore_context(target);
 586
 587         /* the front-end may request us not to handle breakpoints */
 588         if (handle_breakpoints)
 589         {
 590                 /* Single step past breakpoint at current address */
 591                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 592                 {
 593                         LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
 594                         cortex_m3_unset_breakpoint(target, breakpoint);
 595                         cortex_m3_single_step_core(target);
 596                         cortex_m3_set_breakpoint(target, breakpoint);
 597                 }
 598         }
 599
 600         /* Set/Clear C_MASKINTS in a separate operation */
 601         if ((cortex_m3->dcb_dhcsr & C_MASKINTS) != (dcb_dhcsr & C_MASKINTS))
 602                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr | C_HALT );
 603
 604         /* Restart core */
 605         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr );
 606         target->debug_reason = DBG_REASON_NOTHALTED;
 607
 608         /* registers are now invalid */
 609         armv7m_invalidate_core_regs(target);
 610         if (!debug_execution)
 611         {
 612                 target->state = TARGET_RUNNING;
 613                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 614                 LOG_DEBUG("target resumed at 0x%x",resume_pc);
 615         }
 616         else
 617         {
 618                 target->state = TARGET_DEBUG_RUNNING;
 619                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 620                 LOG_DEBUG("target debug resumed at 0x%x",resume_pc);
 621         }
 622
 623         return ERROR_OK;
 624 }
 625
 626 /* int irqstepcount=0; */
 627 int cortex_m3_step(struct target_s *target, int current, u32 address, int handle_breakpoints)
 628 {
 629         /* get pointers to arch-specific information */
 630         armv7m_common_t *armv7m = target->arch_info;
 631         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 632         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 633         breakpoint_t *breakpoint = NULL;
 634
 635         if (target->state != TARGET_HALTED)
 636         {
 637                 LOG_WARNING("target not halted");
 638                 return ERROR_TARGET_NOT_HALTED;
 639         }
 640
 641         /* current = 1: continue on current pc, otherwise continue at <address> */
 642         if (!current)
 643                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 644
 645         /* the front-end may request us not to handle breakpoints */
 646         if (handle_breakpoints)
 647                 if ((breakpoint = breakpoint_find(target, buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32))))
 648                         cortex_m3_unset_breakpoint(target, breakpoint);
 649
 650         target->debug_reason = DBG_REASON_SINGLESTEP;
 651
 652         armv7m_restore_context(target);
 653
 654         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 655
 656         if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 657                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN );
 658         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY| C_STEP | C_DEBUGEN);
 659         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 660
 661         /* registers are now invalid */
 662         armv7m_invalidate_core_regs(target);
 663
 664         if (breakpoint)
 665                 cortex_m3_set_breakpoint(target, breakpoint);
 666
 667         LOG_DEBUG("target stepped dcb_dhcsr = 0x%x nvic_icsr = 0x%x", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 668
 669         cortex_m3_debug_entry(target);
 670         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 671
 672         LOG_DEBUG("target stepped dcb_dhcsr = 0x%x nvic_icsr = 0x%x", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 673         return ERROR_OK;
 674 }
 675
 676 int cortex_m3_assert_reset(target_t *target)
 677 {
 678         armv7m_common_t *armv7m = target->arch_info;
 679         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 680         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 681         int assert_srst = 1;
 682
 683         LOG_DEBUG("target->state: %s",
 684                 Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name );
 685
 686         if (!(jtag_reset_config & RESET_HAS_SRST))
 687         {
 688                 LOG_ERROR("Can't assert SRST");
 689                 return ERROR_FAIL;
 690         }
 691
 692         /* Enable debug requests */
 693         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 694         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 695                 ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN );
 696
 697         ahbap_write_system_u32(swjdp, DCB_DCRDR, 0 );
 698
 699         if (!target->reset_halt)
 700         {
 701                 /* Set/Clear C_MASKINTS in a separate operation */
 702                 if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 703                         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
 704
 705                 cortex_m3_clear_halt(target);
 706
 707                 /* Enter debug state on reset, cf. end_reset_event() */
 708                 ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR);
 709         }
 710         else
 711         {
 712                 /* Enter debug state on reset, cf. end_reset_event() */
 713                 ahbap_write_system_atomic_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 714         }
 715
 716         /* following hack is to handle luminary reset
 717          * when srst is asserted the luminary device seesm to also clear the debug registers
 718          * which does not match the armv7 debug TRM */
 719
 720         if (strcmp(cortex_m3->variant, "lm3s") == 0)
 721         {
 722                 /* get revision of lm3s target, only early silicon has this issue
 723                  * Fury Rev B, DustDevil Rev B, Tempest all ok */
 724
 725                 u32 did0;
 726
 727                 if (target_read_u32(target, 0x400fe000, &did0) == ERROR_OK)
 728                 {
 729                         switch ((did0 >> 16) & 0xff)
 730                         {
 731                                 case 0:
 732                                         /* all Sandstorm suffer issue */
 733                                         assert_srst = 0;
 734                                         break;
 735
 736                                 case 1:
 737                                 case 3:
 738                                         /* only Fury/DustDevil rev A suffer reset problems */
 739                                         if (((did0 >> 8) & 0xff) == 0)
 740                                                 assert_srst = 0;
 741                                         break;
 742                         }
 743                 }
 744         }
 745
 746         if (assert_srst)
 747         {
 748                 /* default to asserting srst */
 749                 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 750                 {
 751                         jtag_add_reset(1, 1);
 752                 }
 753                 else
 754                 {
 755                         jtag_add_reset(0, 1);
 756                 }
 757         }
 758         else
 759         {
 760                 /* this causes the luminary device to reset using the watchdog */
 761                 ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ );
 762                 LOG_DEBUG("Using Luminary Reset: SYSRESETREQ");
 763
 764                 {
 765                         /* I do not know why this is necessary, but it fixes strange effects
 766                          * (step/resume cause a NMI after reset) on LM3S6918 -- Michael Schwingen */
 767                         u32 tmp;
 768                         ahbap_read_system_atomic_u32(swjdp, NVIC_AIRCR, &tmp );
 769                 }
 770         }
 771
 772         target->state = TARGET_RESET;
 773         jtag_add_sleep(50000);
 774
 775         armv7m_invalidate_core_regs(target);
 776
 777         if (target->reset_halt)
 778         {
 779                 int retval;
 780                 if ((retval = target_halt(target))!=ERROR_OK)
 781                         return retval;
 782         }
 783
 784         return ERROR_OK;
 785 }
 786
 787 int cortex_m3_deassert_reset(target_t *target)
 788 {
 789         LOG_DEBUG("target->state: %s",
 790                 Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name);
 791
 792         /* deassert reset lines */
 793         jtag_add_reset(0, 0);
 794
 795         return ERROR_OK;
 796 }
 797
 798 void cortex_m3_enable_breakpoints(struct target_s *target)
 799 {
 800         breakpoint_t *breakpoint = target->breakpoints;
 801
 802         /* set any pending breakpoints */
 803         while (breakpoint)
 804         {
 805                 if (breakpoint->set == 0)
 806                         cortex_m3_set_breakpoint(target, breakpoint);
 807                 breakpoint = breakpoint->next;
 808         }
 809 }
 810
 811 int cortex_m3_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 812 {
 813         int retval;
 814         int fp_num=0;
 815         u32 hilo;
 816
 817         /* get pointers to arch-specific information */
 818         armv7m_common_t *armv7m = target->arch_info;
 819         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 820
 821         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 822
 823         if (breakpoint->set)
 824         {
 825                 LOG_WARNING("breakpoint already set");
 826                 return ERROR_OK;
 827         }
 828
 829         if (cortex_m3->auto_bp_type)
 830         {
 831                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 832         }
 833
 834         if (breakpoint->type == BKPT_HARD)
 835         {
 836                 while(comparator_list[fp_num].used && (fp_num < cortex_m3->fp_num_code))
 837                         fp_num++;
 838                 if (fp_num >= cortex_m3->fp_num_code)
 839                 {
 840                         LOG_DEBUG("ERROR Can not find free FP Comparator");
 841                         LOG_WARNING("ERROR Can not find free FP Comparator");
 842                         exit(-1);
 843                 }
 844                 breakpoint->set = fp_num + 1;
 845                 hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
 846                 comparator_list[fp_num].used = 1;
 847                 comparator_list[fp_num].fpcr_value = (breakpoint->address & 0x1FFFFFFC) | hilo | 1;
 848                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 849                 LOG_DEBUG("fpc_num %i fpcr_value 0x%x", fp_num, comparator_list[fp_num].fpcr_value);
 850         }
 851         else if (breakpoint->type == BKPT_SOFT)
 852         {
 853                 u8 code[4];
 854                 buf_set_u32(code, 0, 32, ARMV7M_T_BKPT(0x11));
 855                 if((retval = target->type->read_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, breakpoint->orig_instr)) != ERROR_OK)
 856                 {
 857                         return retval;
 858                 }
 859                 if((retval = target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, code)) != ERROR_OK)
 860                 {
 861                         return retval;
 862                 }
 863                 breakpoint->set = 0x11; /* Any nice value but 0 */
 864         }
 865
 866         return ERROR_OK;
 867 }
 868
 869 int cortex_m3_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 870 {
 871         int retval;
 872         /* get pointers to arch-specific information */
 873         armv7m_common_t *armv7m = target->arch_info;
 874         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 875         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 876
 877         if (!breakpoint->set)
 878         {
 879                 LOG_WARNING("breakpoint not set");
 880                 return ERROR_OK;
 881         }
 882
 883         if (breakpoint->type == BKPT_HARD)
 884         {
 885                 int fp_num = breakpoint->set - 1;
 886                 if ((fp_num < 0) || (fp_num >= cortex_m3->fp_num_code))
 887                 {
 888                         LOG_DEBUG("Invalid FP Comparator number in breakpoint");
 889                         return ERROR_OK;
 890                 }
 891                 comparator_list[fp_num].used = 0;
 892                 comparator_list[fp_num].fpcr_value = 0;
 893                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 894         }
 895         else
 896         {
 897                 /* restore original instruction (kept in target endianness) */
 898                 if (breakpoint->length == 4)
 899                 {
 900                         if((retval = target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1, breakpoint->orig_instr)) != ERROR_OK)
 901                         {
 902                                 return retval;
 903                         }
 904                 }
 905                 else
 906                 {
 907                         if((retval = target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1, breakpoint->orig_instr)) != ERROR_OK)
 908                         {
 909                                 return retval;
 910                         }
 911                 }
 912         }
 913         breakpoint->set = 0;
 914
 915         return ERROR_OK;
 916 }
 917
 918 int cortex_m3_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 919 {
 920         /* get pointers to arch-specific information */
 921         armv7m_common_t *armv7m = target->arch_info;
 922         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 923
 924         if (cortex_m3->auto_bp_type)
 925         {
 926                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 927 #ifdef ARMV7_GDB_HACKS
 928                 if (breakpoint->length != 2) {
 929                         /* XXX Hack: Replace all breakpoints with length != 2 with
 930                          * a hardware breakpoint. */
 931                         breakpoint->type = BKPT_HARD;
 932                         breakpoint->length = 2;
 933                 }
 934 #endif
 935         }
 936
 937         if ((breakpoint->type == BKPT_HARD) && (breakpoint->address >= 0x20000000))
 938         {
 939                 LOG_INFO("flash patch comparator requested outside code memory region");
 940                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 941         }
 942
 943         if ((breakpoint->type == BKPT_SOFT) && (breakpoint->address < 0x20000000))
 944         {
 945                 LOG_INFO("soft breakpoint requested in code (flash) memory region");
 946                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 947         }
 948
 949         if ((breakpoint->type == BKPT_HARD) && (cortex_m3->fp_code_available < 1))
 950         {
 951                 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
 952                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 953         }
 954
 955         if ((breakpoint->length != 2))
 956         {
 957                 LOG_INFO("only breakpoints of two bytes length supported");
 958                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 959         }
 960
 961         if (breakpoint->type == BKPT_HARD)
 962                 cortex_m3->fp_code_available--;
 963         cortex_m3_set_breakpoint(target, breakpoint);
 964
 965         return ERROR_OK;
 966 }
 967
 968 int cortex_m3_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 969 {
 970         /* get pointers to arch-specific information */
 971         armv7m_common_t *armv7m = target->arch_info;
 972         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 973
 974         if (target->state != TARGET_HALTED)
 975         {
 976                 LOG_WARNING("target not halted");
 977                 return ERROR_TARGET_NOT_HALTED;
 978         }
 979
 980         if (cortex_m3->auto_bp_type)
 981         {
 982                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 983         }
 984
 985         if (breakpoint->set)
 986         {
 987                 cortex_m3_unset_breakpoint(target, breakpoint);
 988         }
 989
 990         if (breakpoint->type == BKPT_HARD)
 991                 cortex_m3->fp_code_available++;
 992
 993         return ERROR_OK;
 994 }
 995
 996 int cortex_m3_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
 997 {
 998         int dwt_num=0;
 999         u32 mask, temp;
1000
1001         /* get pointers to arch-specific information */
1002         armv7m_common_t *armv7m = target->arch_info;
1003         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1004         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
1005
1006         if (watchpoint->set)
1007         {
1008                 LOG_WARNING("watchpoint already set");
1009                 return ERROR_OK;
1010         }
1011
1012         if (watchpoint->mask == 0xffffffffu)
1013         {
1014                 while(comparator_list[dwt_num].used && (dwt_num < cortex_m3->dwt_num_comp))
1015                         dwt_num++;
1016                 if (dwt_num >= cortex_m3->dwt_num_comp)
1017                 {
1018                         LOG_DEBUG("ERROR Can not find free DWT Comparator");
1019                         LOG_WARNING("ERROR Can not find free DWT Comparator");
1020                         return -1;
1021                 }
1022                 watchpoint->set = dwt_num + 1;
1023                 mask = 0;
1024                 temp = watchpoint->length;
1025                 while (temp > 1)
1026                 {
1027                         temp = temp / 2;
1028                         mask++;
1029                 }
1030                 comparator_list[dwt_num].used = 1;
1031                 comparator_list[dwt_num].comp = watchpoint->address;
1032                 comparator_list[dwt_num].mask = mask;
1033                 comparator_list[dwt_num].function = watchpoint->rw + 5;
1034                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address, comparator_list[dwt_num].comp);
1035                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x4, comparator_list[dwt_num].mask);
1036                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x8, comparator_list[dwt_num].function);
1037                 LOG_DEBUG("dwt_num %i 0x%x 0x%x 0x%x", dwt_num, comparator_list[dwt_num].comp, comparator_list[dwt_num].mask, comparator_list[dwt_num].function);
1038         }
1039         else
1040         {
1041                 LOG_WARNING("Cannot watch data values");  /* Move this test to add_watchpoint */
1042                 return ERROR_OK;
1043         }
1044
1045         return ERROR_OK;
1046
1047 }
1048
1049 int cortex_m3_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1050 {
1051         /* get pointers to arch-specific information */
1052         armv7m_common_t *armv7m = target->arch_info;
1053         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1054         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
1055         int dwt_num;
1056
1057         if (!watchpoint->set)
1058         {
1059                 LOG_WARNING("watchpoint not set");
1060                 return ERROR_OK;
1061         }
1062
1063         dwt_num = watchpoint->set - 1;
1064
1065         if ((dwt_num < 0) || (dwt_num >= cortex_m3->dwt_num_comp))
1066         {
1067                 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1068                 return ERROR_OK;
1069         }
1070         comparator_list[dwt_num].used = 0;
1071         comparator_list[dwt_num].function = 0;
1072         target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x8, comparator_list[dwt_num].function);
1073
1074         watchpoint->set = 0;
1075
1076         return ERROR_OK;
1077 }
1078
1079 int cortex_m3_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1080 {
1081         /* get pointers to arch-specific information */
1082         armv7m_common_t *armv7m = target->arch_info;
1083         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1084
1085         if (target->state != TARGET_HALTED)
1086         {
1087                 LOG_WARNING("target not halted");
1088                 return ERROR_TARGET_NOT_HALTED;
1089         }
1090
1091         if (cortex_m3->dwt_comp_available < 1)
1092         {
1093                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1094         }
1095
1096         if ((watchpoint->length != 1) && (watchpoint->length != 2) && (watchpoint->length != 4))
1097         {
1098                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1099         }
1100
1101         cortex_m3->dwt_comp_available--;
1102
1103         return ERROR_OK;
1104 }
1105
1106 int cortex_m3_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1107 {
1108         /* get pointers to arch-specific information */
1109         armv7m_common_t *armv7m = target->arch_info;
1110         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1111
1112         if (target->state != TARGET_HALTED)
1113         {
1114                 LOG_WARNING("target not halted");
1115                 return ERROR_TARGET_NOT_HALTED;
1116         }
1117
1118         if (watchpoint->set)
1119         {
1120                 cortex_m3_unset_watchpoint(target, watchpoint);
1121         }
1122
1123         cortex_m3->dwt_comp_available++;
1124
1125         return ERROR_OK;
1126 }
1127
1128 void cortex_m3_enable_watchpoints(struct target_s *target)
1129 {
1130         watchpoint_t *watchpoint = target->watchpoints;
1131
1132         /* set any pending watchpoints */
1133         while (watchpoint)
1134         {
1135                 if (watchpoint->set == 0)
1136                         cortex_m3_set_watchpoint(target, watchpoint);
1137                 watchpoint = watchpoint->next;
1138         }
1139 }
1140
1141 int cortex_m3_load_core_reg_u32(struct target_s *target, enum armv7m_regtype type, u32 num, u32 * value)
1142 {
1143         int retval;
1144         /* get pointers to arch-specific information */
1145         armv7m_common_t *armv7m = target->arch_info;
1146         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1147         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1148
1149         if ((type == ARMV7M_REGISTER_CORE_GP) && (num <= ARMV7M_PSP))
1150         {
1151                 /* read a normal core register */
1152                 retval = ahbap_read_coreregister_u32(swjdp, value, num);
1153
1154                 if (retval != ERROR_OK)
1155                 {
1156                         LOG_ERROR("JTAG failure %i",retval);
1157                         return ERROR_JTAG_DEVICE_ERROR;
1158                 }
1159                 LOG_DEBUG("load from core reg %i  value 0x%x",num,*value);
1160         }
1161         else if (type == ARMV7M_REGISTER_CORE_SP) /* Special purpose core register */
1162         {
1163                 /* read other registers */
1164                 ahbap_read_coreregister_u32(swjdp, value, 20);
1165
1166                 switch (num)
1167                 {
1168                         case 19:
1169                                 *value = buf_get_u32((u8*)value, 0, 8);
1170                                 break;
1171
1172                         case 20:
1173                                 *value = buf_get_u32((u8*)value, 8, 8);
1174                                 break;
1175
1176                         case 21:
1177                                 *value = buf_get_u32((u8*)value, 16, 8);
1178                                 break;
1179
1180                         case 22:
1181                                 *value = buf_get_u32((u8*)value, 24, 8);
1182                                 break;
1183                 }
1184
1185                 LOG_DEBUG("load from special reg %i value 0x%x", num, *value);
1186         }
1187         else
1188         {
1189                 return ERROR_INVALID_ARGUMENTS;
1190         }
1191
1192         return ERROR_OK;
1193 }
1194
1195 int cortex_m3_store_core_reg_u32(struct target_s *target, enum armv7m_regtype type, u32 num, u32 value)
1196 {
1197         int retval;
1198         u32 reg;
1199
1200         /* get pointers to arch-specific information */
1201         armv7m_common_t *armv7m = target->arch_info;
1202         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1203         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1204
1205 #ifdef ARMV7_GDB_HACKS
1206         /* If the LR register is being modified, make sure it will put us
1207          * in "thumb" mode, or an INVSTATE exception will occur. This is a
1208          * hack to deal with the fact that gdb will sometimes "forge"
1209          * return addresses, and doesn't set the LSB correctly (i.e., when
1210          * printing expressions containing function calls, it sets LR=0.) */
1211
1212         if (num == 14)
1213                 value |= 0x01;
1214 #endif
1215
1216         if ((type == ARMV7M_REGISTER_CORE_GP) && (num <= ARMV7M_PSP))
1217         {
1218                 retval = ahbap_write_coreregister_u32(swjdp, value, num);
1219                 if (retval != ERROR_OK)
1220                 {
1221                         LOG_ERROR("JTAG failure %i", retval);
1222                         armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
1223                         return ERROR_JTAG_DEVICE_ERROR;
1224                 }
1225                 LOG_DEBUG("write core reg %i value 0x%x", num, value);
1226         }
1227         else if (type == ARMV7M_REGISTER_CORE_SP) /* Special purpose core register */
1228         {
1229                 /* write other registers */
1230
1231                 ahbap_read_coreregister_u32(swjdp, &reg, 20);
1232
1233                 switch (num)
1234                 {
1235                         case 19:
1236                                 buf_set_u32((u8*)&reg, 0, 8, value);
1237                                 break;
1238
1239                         case 20:
1240                                 buf_set_u32((u8*)&reg, 8, 8, value);
1241                                 break;
1242
1243                         case 21:
1244                                 buf_set_u32((u8*)&reg, 16, 8, value);
1245                                 break;
1246
1247                         case 22:
1248                                 buf_set_u32((u8*)&reg, 24, 8, value);
1249                                 break;
1250                 }
1251
1252                 ahbap_write_coreregister_u32(swjdp, reg, 20);
1253
1254                 LOG_DEBUG("write special reg %i value 0x%x ", num, value);
1255         }
1256         else
1257         {
1258                 return ERROR_INVALID_ARGUMENTS;
1259         }
1260
1261         return ERROR_OK;
1262 }
1263
1264 int cortex_m3_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
1265 {
1266         /* get pointers to arch-specific information */
1267         armv7m_common_t *armv7m = target->arch_info;
1268         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1269         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1270         int retval;
1271
1272         /* sanitize arguments */
1273         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1274                 return ERROR_INVALID_ARGUMENTS;
1275
1276         /* cortex_m3 handles unaligned memory access */
1277
1278         switch (size)
1279         {
1280                 case 4:
1281                         retval = ahbap_read_buf_u32(swjdp, buffer, 4 * count, address);
1282                         break;
1283                 case 2:
1284                         retval = ahbap_read_buf_u16(swjdp, buffer, 2 * count, address);
1285                         break;
1286                 case 1:
1287                         retval = ahbap_read_buf_u8(swjdp, buffer, count, address);
1288                         break;
1289                 default:
1290                         LOG_ERROR("BUG: we shouldn't get here");
1291                         exit(-1);
1292         }
1293
1294         return retval;
1295 }
1296
1297 int cortex_m3_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
1298 {
1299         /* get pointers to arch-specific information */
1300         armv7m_common_t *armv7m = target->arch_info;
1301         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1302         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1303         int retval;
1304
1305         /* sanitize arguments */
1306         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1307                 return ERROR_INVALID_ARGUMENTS;
1308
1309         switch (size)
1310         {
1311                 case 4:
1312                         retval = ahbap_write_buf_u32(swjdp, buffer, 4 * count, address);
1313                         break;
1314                 case 2:
1315                         retval = ahbap_write_buf_u16(swjdp, buffer, 2 * count, address);
1316                         break;
1317                 case 1:
1318                         retval = ahbap_write_buf_u8(swjdp, buffer, count, address);
1319                         break;
1320                 default:
1321                         LOG_ERROR("BUG: we shouldn't get here");
1322                         exit(-1);
1323         }
1324
1325         return retval;
1326 }
1327
1328 int cortex_m3_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
1329 {
1330         return cortex_m3_write_memory(target, address, 4, count, buffer);
1331 }
1332
1333 void cortex_m3_build_reg_cache(target_t *target)
1334 {
1335         armv7m_build_reg_cache(target);
1336 }
1337
1338 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
1339 {
1340         cortex_m3_build_reg_cache(target);
1341         return ERROR_OK;
1342 }
1343
1344 int cortex_m3_examine(struct target_s *target)
1345 {
1346         int retval;
1347         u32 cpuid, fpcr, dwtcr, ictr;
1348         int i;
1349
1350         /* get pointers to arch-specific information */
1351         armv7m_common_t *armv7m = target->arch_info;
1352         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1353         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1354
1355         target->type->examined = 1;
1356
1357         if ((retval=ahbap_debugport_init(swjdp))!=ERROR_OK)
1358                 return retval;
1359
1360         /* Read from Device Identification Registers */
1361         if ((retval=target_read_u32(target, CPUID, &cpuid))!=ERROR_OK)
1362                 return retval;
1363
1364         if (((cpuid >> 4) & 0xc3f) == 0xc23)
1365                 LOG_DEBUG("CORTEX-M3 processor detected");
1366         LOG_DEBUG("cpuid: 0x%8.8x", cpuid);
1367
1368         target_read_u32(target, NVIC_ICTR, &ictr);
1369         cortex_m3->intlinesnum = (ictr & 0x1F) + 1;
1370         cortex_m3->intsetenable = calloc(cortex_m3->intlinesnum, 4);
1371         for (i = 0; i < cortex_m3->intlinesnum; i++)
1372         {
1373                 target_read_u32(target, NVIC_ISE0 + 4 * i, cortex_m3->intsetenable + i);
1374                 LOG_DEBUG("interrupt enable[%i] = 0x%8.8x", i, cortex_m3->intsetenable[i]);
1375         }
1376
1377         /* Setup FPB */
1378         target_read_u32(target, FP_CTRL, &fpcr);
1379         cortex_m3->auto_bp_type = 1;
1380         cortex_m3->fp_num_code = (fpcr >> 4) & 0xF;
1381         cortex_m3->fp_num_lit = (fpcr >> 8) & 0xF;
1382         cortex_m3->fp_code_available = cortex_m3->fp_num_code;
1383         cortex_m3->fp_comparator_list = calloc(cortex_m3->fp_num_code + cortex_m3->fp_num_lit, sizeof(cortex_m3_fp_comparator_t));
1384         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
1385         {
1386                 cortex_m3->fp_comparator_list[i].type = (i < cortex_m3->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
1387                 cortex_m3->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
1388         }
1389         LOG_DEBUG("FPB fpcr 0x%x, numcode %i, numlit %i", fpcr, cortex_m3->fp_num_code, cortex_m3->fp_num_lit);
1390
1391         /* Setup DWT */
1392         target_read_u32(target, DWT_CTRL, &dwtcr);
1393         cortex_m3->dwt_num_comp = (dwtcr >> 28) & 0xF;
1394         cortex_m3->dwt_comp_available = cortex_m3->dwt_num_comp;
1395         cortex_m3->dwt_comparator_list=calloc(cortex_m3->dwt_num_comp, sizeof(cortex_m3_dwt_comparator_t));
1396         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
1397         {
1398                 cortex_m3->dwt_comparator_list[i].dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1399         }
1400
1401         return ERROR_OK;
1402 }
1403
1404 int cortex_m3_quit(void)
1405 {
1406
1407         return ERROR_OK;
1408 }
1409
1410 int cortex_m3_dcc_read(swjdp_common_t *swjdp, u8 *value, u8 *ctrl)
1411 {
1412         u16 dcrdr;
1413
1414         ahbap_read_buf_u16( swjdp, (u8*)&dcrdr, 1, DCB_DCRDR);
1415         *ctrl = (u8)dcrdr;
1416         *value = (u8)(dcrdr >> 8);
1417
1418         LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
1419
1420         /* write ack back to software dcc register
1421          * signify we have read data */
1422         if (dcrdr & (1 << 0))
1423         {
1424                 dcrdr = 0;
1425                 ahbap_write_buf_u16( swjdp, (u8*)&dcrdr, 1, DCB_DCRDR);
1426         }
1427
1428         return ERROR_OK;
1429 }
1430
1431 int cortex_m3_target_request_data(target_t *target, u32 size, u8 *buffer)
1432 {
1433         armv7m_common_t *armv7m = target->arch_info;
1434         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1435         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1436         u8 data;
1437         u8 ctrl;
1438         int i;
1439
1440         for (i = 0; i < (size * 4); i++)
1441         {
1442                 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1443                 buffer[i] = data;
1444         }
1445
1446         return ERROR_OK;
1447 }
1448
1449 int cortex_m3_handle_target_request(void *priv)
1450 {
1451         target_t *target = priv;
1452         if (!target->type->examined)
1453                 return ERROR_OK;
1454         armv7m_common_t *armv7m = target->arch_info;
1455         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1456         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1457
1458         if (!target->dbg_msg_enabled)
1459                 return ERROR_OK;
1460
1461         if (target->state == TARGET_RUNNING)
1462         {
1463                 u8 data;
1464                 u8 ctrl;
1465
1466                 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1467
1468                 /* check if we have data */
1469                 if (ctrl & (1 << 0))
1470                 {
1471                         u32 request;
1472
1473                         /* we assume target is quick enough */
1474                         request = data;
1475                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1476                         request |= (data << 8);
1477                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1478                         request |= (data << 16);
1479                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1480                         request |= (data << 24);
1481                         target_request(target, request);
1482                 }
1483         }
1484
1485         return ERROR_OK;
1486 }
1487
1488 int cortex_m3_init_arch_info(target_t *target, cortex_m3_common_t *cortex_m3, int chain_pos, const char *variant)
1489 {
1490         armv7m_common_t *armv7m;
1491         armv7m = &cortex_m3->armv7m;
1492
1493         /* prepare JTAG information for the new target */
1494         cortex_m3->jtag_info.chain_pos = chain_pos;
1495         cortex_m3->jtag_info.scann_size = 4;
1496
1497         cortex_m3->swjdp_info.dp_select_value = -1;
1498         cortex_m3->swjdp_info.ap_csw_value = -1;
1499         cortex_m3->swjdp_info.ap_tar_value = -1;
1500         cortex_m3->swjdp_info.jtag_info = &cortex_m3->jtag_info;
1501
1502         /* initialize arch-specific breakpoint handling */
1503
1504         cortex_m3->common_magic = CORTEX_M3_COMMON_MAGIC;
1505         cortex_m3->arch_info = NULL;
1506
1507         /* register arch-specific functions */
1508         armv7m->examine_debug_reason = cortex_m3_examine_debug_reason;
1509
1510         armv7m->pre_debug_entry = NULL;
1511         armv7m->post_debug_entry = NULL;
1512
1513         armv7m->pre_restore_context = NULL;
1514         armv7m->post_restore_context = NULL;
1515
1516         if (variant)
1517         {
1518                 cortex_m3->variant = strdup(variant);
1519         }
1520         else
1521         {
1522                 cortex_m3->variant = strdup("");
1523         }
1524
1525         armv7m_init_arch_info(target, armv7m);
1526         armv7m->arch_info = cortex_m3;
1527         armv7m->load_core_reg_u32 = cortex_m3_load_core_reg_u32;
1528         armv7m->store_core_reg_u32 = cortex_m3_store_core_reg_u32;
1529
1530         target_register_timer_callback(cortex_m3_handle_target_request, 1, 1, target);
1531
1532         return ERROR_OK;
1533 }
1534
1535 int cortex_m3_target_create(struct target_s *target, Jim_Interp *interp)
1536 {
1537         cortex_m3_common_t *cortex_m3 = calloc(1,sizeof(cortex_m3_common_t));
1538
1539         cortex_m3_init_arch_info(target, cortex_m3, target->chain_position, target->variant);
1540
1541         return ERROR_OK;
1542 }
1543
1544 int cortex_m3_register_commands(struct command_context_s *cmd_ctx)
1545 {
1546         int retval;
1547
1548         retval = armv7m_register_commands(cmd_ctx);
1549
1550         return retval;
1551 }