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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  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include "replacements.h"
  28
  29 #include "cortex_m3.h"
  30 #include "armv7m.h"
  31
  32 #include "register.h"
  33 #include "target.h"
  34 #include "target_request.h"
  35 #include "log.h"
  36 #include "jtag.h"
  37 #include "arm_jtag.h"
  38
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 /* cli handling */
  43 int cortex_m3_register_commands(struct command_context_s *cmd_ctx);
  44
  45 /* forward declarations */
  46 void cortex_m3_enable_breakpoints(struct target_s *target);
  47 void cortex_m3_enable_watchpoints(struct target_s *target);
  48 int cortex_m3_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target);
  49 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  50 int cortex_m3_quit();
  51 int cortex_m3_load_core_reg_u32(target_t *target, enum armv7m_regtype type, u32 num, u32 *value);
  52 int cortex_m3_store_core_reg_u32(target_t *target, enum armv7m_regtype type, u32 num, u32 value);
  53 int cortex_m3_target_request_data(target_t *target, u32 size, u8 *buffer);
  54 int cortex_m3_examine(struct command_context_s *cmd_ctx, struct target_s *target);
  55
  56 #ifdef ARMV7_GDB_HACKS
  57 extern u8 armv7m_gdb_dummy_cpsr_value[];
  58 extern reg_t armv7m_gdb_dummy_cpsr_reg;
  59 #endif
  60
  61 target_type_t cortexm3_target =
  62 {
  63         .name = "cortex_m3",
  64
  65         .poll = cortex_m3_poll,
  66         .arch_state = armv7m_arch_state,
  67
  68         .target_request_data = cortex_m3_target_request_data,
  69
  70         .halt = cortex_m3_halt,
  71         .resume = cortex_m3_resume,
  72         .step = cortex_m3_step,
  73
  74         .assert_reset = cortex_m3_assert_reset,
  75         .deassert_reset = cortex_m3_deassert_reset,
  76         .soft_reset_halt = cortex_m3_soft_reset_halt,
  77
  78         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
  79
  80         .read_memory = cortex_m3_read_memory,
  81         .write_memory = cortex_m3_write_memory,
  82         .bulk_write_memory = cortex_m3_bulk_write_memory,
  83         .checksum_memory = armv7m_checksum_memory,
  84
  85         .run_algorithm = armv7m_run_algorithm,
  86
  87         .add_breakpoint = cortex_m3_add_breakpoint,
  88         .remove_breakpoint = cortex_m3_remove_breakpoint,
  89         .add_watchpoint = cortex_m3_add_watchpoint,
  90         .remove_watchpoint = cortex_m3_remove_watchpoint,
  91
  92         .register_commands = cortex_m3_register_commands,
  93         .target_command = cortex_m3_target_command,
  94         .init_target = cortex_m3_init_target,
  95         .examine = cortex_m3_examine,
  96         .quit = cortex_m3_quit
  97 };
  98
  99 int cortex_m3_clear_halt(target_t *target)
 100 {
 101         /* get pointers to arch-specific information */
 102         armv7m_common_t *armv7m = target->arch_info;
 103         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 104         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 105
 106     /* Read Debug Fault Status Register */
 107     ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 108     /* Write Debug Fault Status Register to enable processing to resume ?? Try with and without this !! */
 109     ahbap_write_system_atomic_u32(swjdp, NVIC_DFSR, cortex_m3->nvic_dfsr);
 110     LOG_DEBUG(" NVIC_DFSR 0x%x", cortex_m3->nvic_dfsr);
 111
 112     return ERROR_OK;
 113 }
 114
 115 int cortex_m3_single_step_core(target_t *target)
 116 {
 117         /* get pointers to arch-specific information */
 118         armv7m_common_t *armv7m = target->arch_info;
 119         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 120         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 121
 122         if (!(cortex_m3->dcb_dhcsr & C_MASKINTS))
 123                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN );
 124         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN );
 125         cortex_m3->dcb_dhcsr |= C_MASKINTS;
 126         LOG_DEBUG(" ");
 127         cortex_m3_clear_halt(target);
 128
 129         return ERROR_OK;
 130 }
 131
 132 int cortex_m3_exec_opcode(target_t *target,u32 opcode, int len /* MODE, r0_invalue, &r0_outvalue */ )
 133 {
 134         /* get pointers to arch-specific information */
 135         armv7m_common_t *armv7m = target->arch_info;
 136         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 137         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 138         u32 savedram;
 139         int retvalue;
 140
 141         ahbap_read_system_u32(swjdp, 0x20000000, &savedram);
 142         ahbap_write_system_u32(swjdp, 0x20000000, opcode);
 143         ahbap_write_coreregister_u32(swjdp, 0x20000000, 15);
 144         cortex_m3_single_step_core(target);
 145         armv7m->core_cache->reg_list[15].dirty = armv7m->core_cache->reg_list[15].valid;
 146         retvalue = ahbap_write_system_atomic_u32(swjdp, 0x20000000, savedram);
 147
 148         return retvalue;
 149 }
 150
 151 #if 0
 152 /* Enable interrupts */
 153 int cortex_m3_cpsie(target_t *target, u32 IF)
 154 {
 155         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSIE(IF), 2);
 156 }
 157
 158 /* Disable interrupts */
 159 int cortex_m3_cpsid(target_t *target, u32 IF)
 160 {
 161         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSID(IF), 2);
 162 }
 163 #endif
 164
 165 int cortex_m3_endreset_event(target_t *target)
 166 {
 167         int i;
 168         u32 dcb_demcr;
 169
 170         /* get pointers to arch-specific information */
 171         armv7m_common_t *armv7m = target->arch_info;
 172         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 173         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 174         cortex_m3_fp_comparator_t *fp_list = cortex_m3->fp_comparator_list;
 175         cortex_m3_dwt_comparator_t *dwt_list = cortex_m3->dwt_comparator_list;
 176
 177         ahbap_read_system_atomic_u32(swjdp, DCB_DEMCR, &dcb_demcr);
 178         LOG_DEBUG("DCB_DEMCR = 0x%8.8x",dcb_demcr);
 179
 180         ahbap_write_system_u32(swjdp, DCB_DCRDR, 0 );
 181
 182         /* Enable debug requests */
 183         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 184         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 185                 ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN );
 186         /* Enable trace and dwt */
 187         ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR );
 188         /* Monitor bus faults */
 189         ahbap_write_system_u32(swjdp, NVIC_SHCSR, SHCSR_BUSFAULTENA );
 190
 191         /* Enable FPB */
 192         target_write_u32(target, FP_CTRL, 3);
 193
 194         /* Restore FPB registers */
 195         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
 196         {
 197                 target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
 198         }
 199
 200         /* Restore DWT registers */
 201         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
 202         {
 203                 target_write_u32(target, dwt_list[i].dwt_comparator_address, dwt_list[i].comp);
 204                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x4, dwt_list[i].mask);
 205                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x8, dwt_list[i].function);
 206         }
 207         swjdp_transaction_endcheck(swjdp);
 208
 209         armv7m_invalidate_core_regs(target);
 210         return ERROR_OK;
 211 }
 212
 213 int cortex_m3_examine_debug_reason(target_t *target)
 214 {
 215         /* get pointers to arch-specific information */
 216         armv7m_common_t *armv7m = target->arch_info;
 217         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 218
 219         /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason */
 220         /* only check the debug reason if we don't know it already */
 221
 222         if ((target->debug_reason != DBG_REASON_DBGRQ)
 223                 && (target->debug_reason != DBG_REASON_SINGLESTEP))
 224         {
 225                 /*  INCOMPLETE */
 226
 227                 if (cortex_m3->nvic_dfsr & DFSR_BKPT)
 228                 {
 229                         target->debug_reason = DBG_REASON_BREAKPOINT;
 230                         if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 231                                 target->debug_reason = DBG_REASON_WPTANDBKPT;
 232                 }
 233                 else if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 234                         target->debug_reason = DBG_REASON_WATCHPOINT;
 235         }
 236
 237         return ERROR_OK;
 238 }
 239
 240 int cortex_m3_examine_exception_reason(target_t *target)
 241 {
 242         u32 shcsr, except_sr, cfsr = -1, except_ar = -1;
 243
 244         /* get pointers to arch-specific information */
 245         armv7m_common_t *armv7m = target->arch_info;
 246         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 247         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 248
 249         ahbap_read_system_u32(swjdp, NVIC_SHCSR, &shcsr);
 250         switch (armv7m->exception_number)
 251         {
 252                 case 2: /* NMI */
 253                         break;
 254                 case 3: /* Hard Fault */
 255                         ahbap_read_system_atomic_u32(swjdp, NVIC_HFSR, &except_sr);
 256                         if (except_sr & 0x40000000)
 257                         {
 258                                 ahbap_read_system_u32(swjdp, NVIC_CFSR, &cfsr);
 259                         }
 260                         break;
 261                 case 4: /* Memory Management */
 262                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 263                         ahbap_read_system_u32(swjdp, NVIC_MMFAR, &except_ar);
 264                         break;
 265                 case 5: /* Bus Fault */
 266                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 267                         ahbap_read_system_u32(swjdp, NVIC_BFAR, &except_ar);
 268                         break;
 269                 case 6: /* Usage Fault */
 270                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 271                         break;
 272                 case 11:        /* SVCall */
 273                         break;
 274                 case 12:        /* Debug Monitor */
 275                         ahbap_read_system_u32(swjdp, NVIC_DFSR, &except_sr);
 276                         break;
 277                 case 14:        /* PendSV */
 278                         break;
 279                 case 15:        /* SysTick */
 280                         break;
 281                 default:
 282                         except_sr = 0;
 283                         break;
 284         }
 285         swjdp_transaction_endcheck(swjdp);
 286     LOG_DEBUG("%s SHCSR 0x%x, SR 0x%x, CFSR 0x%x, AR 0x%x", armv7m_exception_string(armv7m->exception_number), \
 287         shcsr, except_sr, cfsr, except_ar);
 288         return ERROR_OK;
 289 }
 290
 291 int cortex_m3_debug_entry(target_t *target)
 292 {
 293         int i;
 294         u32 xPSR;
 295         int retval;
 296
 297         /* get pointers to arch-specific information */
 298         armv7m_common_t *armv7m = target->arch_info;
 299         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 300         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 301
 302         LOG_DEBUG(" ");
 303         if (armv7m->pre_debug_entry)
 304                 armv7m->pre_debug_entry(target);
 305
 306         cortex_m3_clear_halt(target);
 307         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 308
 309         if ((retval = armv7m->examine_debug_reason(target)) != ERROR_OK)
 310                 return retval;
 311
 312         /* Examine target state and mode */
 313         /* First load register acessible through core debug port*/
 314         for (i = 0; i < ARMV7M_PRIMASK; i++)
 315         {
 316                 if (!armv7m->core_cache->reg_list[i].valid)
 317                         armv7m->read_core_reg(target, i);
 318         }
 319
 320         xPSR = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32);
 321
 322 #ifdef ARMV7_GDB_HACKS
 323         /* copy real xpsr reg for gdb, setting thumb bit */
 324         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 0, 32, xPSR);
 325         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 5, 1, 1);
 326         armv7m_gdb_dummy_cpsr_reg.valid = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 327         armv7m_gdb_dummy_cpsr_reg.dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty;
 328 #endif
 329
 330         /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
 331         if (xPSR & 0xf00)
 332         {
 333                 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 334                 cortex_m3_store_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 16, xPSR &~ 0xff);
 335         }
 336
 337         /* Now we can load SP core registers */
 338         for (i = ARMV7M_PRIMASK; i < ARMV7NUMCOREREGS; i++)
 339         {
 340                 if (!armv7m->core_cache->reg_list[i].valid)
 341                         armv7m->read_core_reg(target, i);
 342         }
 343
 344         /* Are we in an exception handler */
 345         if (xPSR & 0x1FF)
 346         {
 347                 armv7m->core_mode = ARMV7M_MODE_HANDLER;
 348                 armv7m->exception_number = (xPSR & 0x1FF);
 349         }
 350         else
 351         {
 352                 armv7m->core_mode = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value, 0, 1);
 353                 armv7m->exception_number = 0;
 354         }
 355
 356         if (armv7m->exception_number)
 357         {
 358                 cortex_m3_examine_exception_reason(target);
 359         }
 360
 361         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%x, target->state: %s", armv7m_mode_strings[armv7m->core_mode], \
 362                 *(u32*)(armv7m->core_cache->reg_list[15].value), target_state_strings[target->state]);
 363
 364         if (armv7m->post_debug_entry)
 365                 armv7m->post_debug_entry(target);
 366
 367         return ERROR_OK;
 368 }
 369
 370 int cortex_m3_poll(target_t *target)
 371 {
 372         int retval;
 373         u32 prev_target_state = target->state;
 374
 375         /* get pointers to arch-specific information */
 376         armv7m_common_t *armv7m = target->arch_info;
 377         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 378         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 379
 380         /* Read from Debug Halting Control and Status Register */
 381         retval = ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 382         if (retval != ERROR_OK)
 383         {
 384                 target->state = TARGET_UNKNOWN;
 385                 return retval;
 386         }
 387
 388         if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 389         {
 390                 /* check if still in reset */
 391                 ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 392
 393                 if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 394                 {
 395                         target->state = TARGET_RESET;
 396                         return ERROR_OK;
 397                 }
 398         }
 399
 400         if (target->state == TARGET_RESET)
 401         {
 402                 /* Cannot switch context while running so endreset is called with target->state == TARGET_RESET */
 403                 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%x", cortex_m3->dcb_dhcsr);
 404                 cortex_m3_endreset_event(target);
 405                 target->state = TARGET_RUNNING;
 406                 prev_target_state = TARGET_RUNNING;
 407         }
 408
 409         if (cortex_m3->dcb_dhcsr & S_HALT)
 410         {
 411                 target->state = TARGET_HALTED;
 412
 413                 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET))
 414                 {
 415                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 416                                 return retval;
 417
 418                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 419                 }
 420                 if (prev_target_state == TARGET_DEBUG_RUNNING)
 421                 {
 422                         LOG_DEBUG(" ");
 423                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 424                                 return retval;
 425
 426                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 427                 }
 428         }
 429
 430         /*
 431         if (cortex_m3->dcb_dhcsr & S_SLEEP)
 432                 target->state = TARGET_SLEEP;
 433         */
 434
 435 #if 0
 436     /* Read Debug Fault Status Register, added to figure out the lockup when running flashtest.script  */
 437         ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 438         LOG_DEBUG("dcb_dhcsr 0x%x, nvic_dfsr 0x%x, target->state: %s", cortex_m3->dcb_dhcsr, cortex_m3->nvic_dfsr, target_state_strings[target->state]);
 439 #endif
 440
 441         return ERROR_OK;
 442 }
 443
 444 int cortex_m3_halt(target_t *target)
 445 {
 446         /* get pointers to arch-specific information */
 447         armv7m_common_t *armv7m = target->arch_info;
 448         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 449         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 450
 451         LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
 452
 453         if (target->state == TARGET_HALTED)
 454         {
 455                 LOG_DEBUG("target was already halted");
 456                 return ERROR_OK;
 457         }
 458
 459         if (target->state == TARGET_UNKNOWN)
 460         {
 461                 LOG_WARNING("target was in unknown state when halt was requested");
 462         }
 463
 464         if (target->state == TARGET_RESET)
 465         {
 466                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) && jtag_srst)
 467                 {
 468                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 469                         return ERROR_TARGET_FAILURE;
 470                 }
 471                 else
 472                 {
 473                         /* we came here in a reset_halt or reset_init sequence
 474                          * debug entry was already prepared in cortex_m3_prepare_reset_halt()
 475                          */
 476                         target->debug_reason = DBG_REASON_DBGRQ;
 477
 478                         return ERROR_OK;
 479                 }
 480         }
 481
 482         /* Write to Debug Halting Control and Status Register */
 483         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
 484
 485         target->debug_reason = DBG_REASON_DBGRQ;
 486
 487         return ERROR_OK;
 488 }
 489
 490 int cortex_m3_soft_reset_halt(struct target_s *target)
 491 {
 492         /* get pointers to arch-specific information */
 493         armv7m_common_t *armv7m = target->arch_info;
 494         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 495         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 496         u32 dcb_dhcsr = 0;
 497         int retval, timeout = 0;
 498
 499         /* Enter debug state on reset, cf. end_reset_event() */
 500         ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 501
 502         /* Request a reset */
 503         ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_VECTRESET );
 504         target->state = TARGET_RESET;
 505
 506         /* registers are now invalid */
 507         armv7m_invalidate_core_regs(target);
 508
 509         while (timeout < 100)
 510         {
 511                 retval = ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &dcb_dhcsr);
 512                 if (retval == ERROR_OK)
 513                 {
 514                     ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 515                         if ((dcb_dhcsr & S_HALT) && (cortex_m3->nvic_dfsr & DFSR_VCATCH))
 516                         {
 517                                 LOG_DEBUG("system reset-halted, dcb_dhcsr 0x%x, nvic_dfsr 0x%x", dcb_dhcsr, cortex_m3->nvic_dfsr);
 518                                 cortex_m3_poll(target);
 519                                 return ERROR_OK;
 520                         }
 521                         else
 522                                 LOG_DEBUG("waiting for system reset-halt, dcb_dhcsr 0x%x, %i ms", dcb_dhcsr, timeout);
 523                 }
 524                 timeout++;
 525                 usleep(1000);
 526         }
 527
 528         return ERROR_OK;
 529 }
 530
 531 int cortex_m3_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution)
 532 {
 533         /* get pointers to arch-specific information */
 534         armv7m_common_t *armv7m = target->arch_info;
 535         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 536         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 537         breakpoint_t *breakpoint = NULL;
 538         u32 dcb_dhcsr, resume_pc;
 539
 540         if (target->state != TARGET_HALTED)
 541         {
 542                 LOG_WARNING("target not halted");
 543                 return ERROR_TARGET_NOT_HALTED;
 544         }
 545
 546         if (!debug_execution)
 547         {
 548                 target_free_all_working_areas(target);
 549                 cortex_m3_enable_breakpoints(target);
 550                 cortex_m3_enable_watchpoints(target);
 551
 552                 /* TODOLATER Interrupt handling/disable for debug execution, cache ... ... */
 553         }
 554
 555         dcb_dhcsr = DBGKEY | C_DEBUGEN;
 556         if (debug_execution)
 557         {
 558                 /* Disable interrupts */
 559                 /*
 560                    We disable interrupts in the PRIMASK register instead of masking with C_MASKINTS,
 561                    This is probably the same inssue as Cortex-M3 Errata 377493:
 562                    C_MASKINTS in parallel with disabled interrupts can cause local faults to not be taken.
 563                 */
 564                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
 565                 /* Make sure we are in Thumb mode */
 566                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
 567                         buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1<<24));
 568         }
 569
 570         /* current = 1: continue on current pc, otherwise continue at <address> */
 571         if (!current)
 572         {
 573                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 574                 armv7m->core_cache->reg_list[15].dirty = 1;
 575                 armv7m->core_cache->reg_list[15].valid = 1;
 576         }
 577
 578         resume_pc = buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32);
 579
 580         armv7m_restore_context(target);
 581
 582         /* the front-end may request us not to handle breakpoints */
 583         if (handle_breakpoints)
 584         {
 585                 /* Single step past breakpoint at current address */
 586                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 587                 {
 588                         LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
 589                         cortex_m3_unset_breakpoint(target, breakpoint);
 590                         cortex_m3_single_step_core(target);
 591                         cortex_m3_set_breakpoint(target, breakpoint);
 592                 }
 593         }
 594
 595         /* Set/Clear C_MASKINTS in a separate operation */
 596         if ((cortex_m3->dcb_dhcsr & C_MASKINTS) != (dcb_dhcsr & C_MASKINTS))
 597                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr | C_HALT );
 598
 599         /* Restart core */
 600         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr );
 601         target->debug_reason = DBG_REASON_NOTHALTED;
 602
 603         /* registers are now invalid */
 604         armv7m_invalidate_core_regs(target);
 605         if (!debug_execution)
 606         {
 607                 target->state = TARGET_RUNNING;
 608                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 609                 LOG_DEBUG("target resumed at 0x%x",resume_pc);
 610         }
 611         else
 612         {
 613                 target->state = TARGET_DEBUG_RUNNING;
 614                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 615                 LOG_DEBUG("target debug resumed at 0x%x",resume_pc);
 616         }
 617
 618         return ERROR_OK;
 619 }
 620
 621 /* int irqstepcount=0; */
 622 int cortex_m3_step(struct target_s *target, int current, u32 address, int handle_breakpoints)
 623 {
 624         /* get pointers to arch-specific information */
 625         armv7m_common_t *armv7m = target->arch_info;
 626         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 627         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 628         breakpoint_t *breakpoint = NULL;
 629
 630         if (target->state != TARGET_HALTED)
 631         {
 632                 LOG_WARNING("target not halted");
 633                 return ERROR_TARGET_NOT_HALTED;
 634         }
 635
 636         /* current = 1: continue on current pc, otherwise continue at <address> */
 637         if (!current)
 638                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 639
 640         /* the front-end may request us not to handle breakpoints */
 641         if (handle_breakpoints)
 642                 if ((breakpoint = breakpoint_find(target, buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32))))
 643                         cortex_m3_unset_breakpoint(target, breakpoint);
 644
 645         target->debug_reason = DBG_REASON_SINGLESTEP;
 646
 647         armv7m_restore_context(target);
 648
 649         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 650
 651         if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 652                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN );
 653         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY| C_STEP | C_DEBUGEN);
 654         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 655
 656         /* registers are now invalid */
 657         armv7m_invalidate_core_regs(target);
 658
 659         if (breakpoint)
 660                 cortex_m3_set_breakpoint(target, breakpoint);
 661
 662         LOG_DEBUG("target stepped dcb_dhcsr = 0x%x nvic_icsr = 0x%x", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 663
 664         cortex_m3_debug_entry(target);
 665         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 666
 667         LOG_DEBUG("target stepped dcb_dhcsr = 0x%x nvic_icsr = 0x%x", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 668         return ERROR_OK;
 669 }
 670
 671 int cortex_m3_assert_reset(target_t *target)
 672 {
 673         armv7m_common_t *armv7m = target->arch_info;
 674         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 675         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 676         int assert_srst = TRUE;
 677
 678         LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
 679
 680         if (!(jtag_reset_config & RESET_HAS_SRST))
 681         {
 682                 LOG_ERROR("Can't assert SRST");
 683                 return ERROR_FAIL;
 684         }
 685
 686         /* Enable debug requests */
 687         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 688         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 689                 ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN );
 690
 691         ahbap_write_system_u32(swjdp, DCB_DCRDR, 0 );
 692
 693         if (target->reset_mode == RESET_RUN)
 694         {
 695                 /* Set/Clear C_MASKINTS in a separate operation */
 696                 if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 697                         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
 698
 699                 cortex_m3_clear_halt(target);
 700
 701                 /* Enter debug state on reset, cf. end_reset_event() */
 702                 ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR);
 703         }
 704         else
 705         {
 706                 /* Enter debug state on reset, cf. end_reset_event() */
 707                 ahbap_write_system_atomic_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 708         }
 709
 710         /* following hack is to handle luminary reset
 711          * when srst is asserted the luminary device seesm to also clear the debug registers
 712          * which does not match the armv7 debug TRM */
 713
 714         if (strcmp(cortex_m3->variant, "lm3s") == 0)
 715         {
 716                 /* get revision of lm3s target, only early silicon has this issue
 717                  * Fury Rev B, DustDevil Rev B, Tempest all ok */
 718
 719                 u32 did0;
 720
 721                 if (target_read_u32(target, 0x400fe000, &did0) == ERROR_OK)
 722                 {
 723                         switch ((did0 >> 16) & 0xff)
 724                         {
 725                                 case 0:
 726                                         /* all Sandstorm suffer issue */
 727                                         assert_srst = FALSE;
 728                                         break;
 729
 730                                 case 1:
 731                                 case 3:
 732                                         /* only Fury/DustDevil rev A suffer reset problems */
 733                                         if (((did0 >> 8) & 0xff) == 0)
 734                                                 assert_srst = FALSE;
 735                                         break;
 736                         }
 737                 }
 738         }
 739
 740         if (assert_srst == TRUE)
 741         {
 742                 /* default to asserting srst */
 743                 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 744                 {
 745                         jtag_add_reset(1, 1);
 746                 }
 747                 else
 748                 {
 749                         jtag_add_reset(0, 1);
 750                 }
 751         }
 752         else
 753         {
 754                 /* this causes the luminary device to reset using the watchdog */
 755                 ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ );
 756                 LOG_DEBUG("Using Luminary Reset: SYSRESETREQ");
 757         }
 758
 759         target->state = TARGET_RESET;
 760         jtag_add_sleep(50000);
 761
 762         armv7m_invalidate_core_regs(target);
 763
 764         return ERROR_OK;
 765 }
 766
 767 int cortex_m3_deassert_reset(target_t *target)
 768 {
 769         LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
 770
 771         /* deassert reset lines */
 772         jtag_add_reset(0, 0);
 773
 774         return ERROR_OK;
 775 }
 776
 777 void cortex_m3_enable_breakpoints(struct target_s *target)
 778 {
 779         breakpoint_t *breakpoint = target->breakpoints;
 780
 781         /* set any pending breakpoints */
 782         while (breakpoint)
 783         {
 784                 if (breakpoint->set == 0)
 785                         cortex_m3_set_breakpoint(target, breakpoint);
 786                 breakpoint = breakpoint->next;
 787         }
 788 }
 789
 790 int cortex_m3_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 791 {
 792         int fp_num=0;
 793         u32 hilo;
 794
 795         /* get pointers to arch-specific information */
 796         armv7m_common_t *armv7m = target->arch_info;
 797         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 798
 799         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 800
 801         if (breakpoint->set)
 802         {
 803                 LOG_WARNING("breakpoint already set");
 804                 return ERROR_OK;
 805         }
 806
 807         if (cortex_m3->auto_bp_type)
 808         {
 809                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 810         }
 811
 812         if (breakpoint->type == BKPT_HARD)
 813         {
 814                 while(comparator_list[fp_num].used && (fp_num < cortex_m3->fp_num_code))
 815                         fp_num++;
 816                 if (fp_num >= cortex_m3->fp_num_code)
 817                 {
 818                         LOG_DEBUG("ERROR Can not find free FP Comparator");
 819                         LOG_WARNING("ERROR Can not find free FP Comparator");
 820                         exit(-1);
 821                 }
 822                 breakpoint->set = fp_num + 1;
 823                 hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
 824                 comparator_list[fp_num].used = 1;
 825                 comparator_list[fp_num].fpcr_value = (breakpoint->address & 0x1FFFFFFC) | hilo | 1;
 826                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 827                 LOG_DEBUG("fpc_num %i fpcr_value 0x%x", fp_num, comparator_list[fp_num].fpcr_value);
 828         }
 829         else if (breakpoint->type == BKPT_SOFT)
 830         {
 831                 u8 code[4];
 832                 buf_set_u32(code, 0, 32, ARMV7M_T_BKPT(0x11));
 833                 target->type->read_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, breakpoint->orig_instr);
 834                 target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, code);
 835                 breakpoint->set = 0x11; /* Any nice value but 0 */
 836         }
 837
 838         return ERROR_OK;
 839 }
 840
 841 int cortex_m3_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 842 {
 843         /* get pointers to arch-specific information */
 844         armv7m_common_t *armv7m = target->arch_info;
 845         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 846         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 847
 848         if (!breakpoint->set)
 849         {
 850                 LOG_WARNING("breakpoint not set");
 851                 return ERROR_OK;
 852         }
 853
 854         if (breakpoint->type == BKPT_HARD)
 855         {
 856                 int fp_num = breakpoint->set - 1;
 857                 if ((fp_num < 0) || (fp_num >= cortex_m3->fp_num_code))
 858                 {
 859                         LOG_DEBUG("Invalid FP Comparator number in breakpoint");
 860                         return ERROR_OK;
 861                 }
 862                 comparator_list[fp_num].used = 0;
 863                 comparator_list[fp_num].fpcr_value = 0;
 864                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 865         }
 866         else
 867         {
 868                 /* restore original instruction (kept in target endianness) */
 869                 if (breakpoint->length == 4)
 870                 {
 871                         target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1, breakpoint->orig_instr);
 872                 }
 873                 else
 874                 {
 875                         target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1, breakpoint->orig_instr);
 876                 }
 877         }
 878         breakpoint->set = 0;
 879
 880         return ERROR_OK;
 881 }
 882
 883 int cortex_m3_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 884 {
 885         /* get pointers to arch-specific information */
 886         armv7m_common_t *armv7m = target->arch_info;
 887         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 888
 889         if (cortex_m3->auto_bp_type)
 890         {
 891                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 892 #ifdef ARMV7_GDB_HACKS
 893                 if (breakpoint->length != 2) {
 894                         /* XXX Hack: Replace all breakpoints with length != 2 with
 895                          * a hardware breakpoint. */
 896                         breakpoint->type = BKPT_HARD;
 897                         breakpoint->length = 2;
 898                 }
 899 #endif
 900         }
 901
 902         if ((breakpoint->type == BKPT_HARD) && (breakpoint->address >= 0x20000000))
 903         {
 904                 LOG_INFO("flash patch comparator requested outside code memory region");
 905                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 906         }
 907
 908         if ((breakpoint->type == BKPT_SOFT) && (breakpoint->address < 0x20000000))
 909         {
 910                 LOG_INFO("soft breakpoint requested in code (flash) memory region");
 911                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 912         }
 913
 914         if ((breakpoint->type == BKPT_HARD) && (cortex_m3->fp_code_available < 1))
 915         {
 916                 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
 917                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 918         }
 919
 920         if ((breakpoint->length != 2))
 921         {
 922                 LOG_INFO("only breakpoints of two bytes length supported");
 923                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 924         }
 925
 926         if (breakpoint->type == BKPT_HARD)
 927                 cortex_m3->fp_code_available--;
 928         cortex_m3_set_breakpoint(target, breakpoint);
 929
 930         return ERROR_OK;
 931 }
 932
 933 int cortex_m3_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 934 {
 935         /* get pointers to arch-specific information */
 936         armv7m_common_t *armv7m = target->arch_info;
 937         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 938
 939         if (target->state != TARGET_HALTED)
 940         {
 941                 LOG_WARNING("target not halted");
 942                 return ERROR_TARGET_NOT_HALTED;
 943         }
 944
 945         if (cortex_m3->auto_bp_type)
 946         {
 947                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 948         }
 949
 950         if (breakpoint->set)
 951         {
 952                 cortex_m3_unset_breakpoint(target, breakpoint);
 953         }
 954
 955         if (breakpoint->type == BKPT_HARD)
 956                 cortex_m3->fp_code_available++;
 957
 958         return ERROR_OK;
 959 }
 960
 961 int cortex_m3_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
 962 {
 963         int dwt_num=0;
 964         u32 mask, temp;
 965
 966         /* get pointers to arch-specific information */
 967         armv7m_common_t *armv7m = target->arch_info;
 968         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 969         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
 970
 971         if (watchpoint->set)
 972         {
 973                 LOG_WARNING("watchpoint already set");
 974                 return ERROR_OK;
 975         }
 976
 977         if (watchpoint->mask == 0xffffffffu)
 978         {
 979                 while(comparator_list[dwt_num].used && (dwt_num < cortex_m3->dwt_num_comp))
 980                         dwt_num++;
 981                 if (dwt_num >= cortex_m3->dwt_num_comp)
 982                 {
 983                         LOG_DEBUG("ERROR Can not find free DWT Comparator");
 984                         LOG_WARNING("ERROR Can not find free DWT Comparator");
 985                         return -1;
 986                 }
 987                 watchpoint->set = dwt_num + 1;
 988                 mask = 0;
 989                 temp = watchpoint->length;
 990                 while (temp > 1)
 991                 {
 992                         temp = temp / 2;
 993                         mask++;
 994                 }
 995                 comparator_list[dwt_num].used = 1;
 996                 comparator_list[dwt_num].comp = watchpoint->address;
 997                 comparator_list[dwt_num].mask = mask;
 998                 comparator_list[dwt_num].function = watchpoint->rw + 5;
 999                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address, comparator_list[dwt_num].comp);
1000                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x4, comparator_list[dwt_num].mask);
1001                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x8, comparator_list[dwt_num].function);
1002                 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);
1003         }
1004         else
1005         {
1006                 LOG_WARNING("Cannot watch data values");  /* Move this test to add_watchpoint */
1007                 return ERROR_OK;
1008         }
1009
1010         return ERROR_OK;
1011
1012 }
1013
1014 int cortex_m3_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1015 {
1016         /* get pointers to arch-specific information */
1017         armv7m_common_t *armv7m = target->arch_info;
1018         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1019         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
1020         int dwt_num;
1021
1022         if (!watchpoint->set)
1023         {
1024                 LOG_WARNING("watchpoint not set");
1025                 return ERROR_OK;
1026         }
1027
1028         dwt_num = watchpoint->set - 1;
1029
1030         if ((dwt_num < 0) || (dwt_num >= cortex_m3->dwt_num_comp))
1031         {
1032                 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1033                 return ERROR_OK;
1034         }
1035         comparator_list[dwt_num].used = 0;
1036         comparator_list[dwt_num].function = 0;
1037         target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x8, comparator_list[dwt_num].function);
1038
1039         watchpoint->set = 0;
1040
1041         return ERROR_OK;
1042 }
1043
1044 int cortex_m3_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1045 {
1046         /* get pointers to arch-specific information */
1047         armv7m_common_t *armv7m = target->arch_info;
1048         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1049
1050         if (target->state != TARGET_HALTED)
1051         {
1052                 LOG_WARNING("target not halted");
1053                 return ERROR_TARGET_NOT_HALTED;
1054         }
1055
1056         if (cortex_m3->dwt_comp_available < 1)
1057         {
1058                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1059         }
1060
1061         if ((watchpoint->length != 1) && (watchpoint->length != 2) && (watchpoint->length != 4))
1062         {
1063                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1064         }
1065
1066         cortex_m3->dwt_comp_available--;
1067
1068         return ERROR_OK;
1069 }
1070
1071 int cortex_m3_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1072 {
1073         /* get pointers to arch-specific information */
1074         armv7m_common_t *armv7m = target->arch_info;
1075         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1076
1077         if (target->state != TARGET_HALTED)
1078         {
1079                 LOG_WARNING("target not halted");
1080                 return ERROR_TARGET_NOT_HALTED;
1081         }
1082
1083         if (watchpoint->set)
1084         {
1085                 cortex_m3_unset_watchpoint(target, watchpoint);
1086         }
1087
1088         cortex_m3->dwt_comp_available++;
1089
1090         return ERROR_OK;
1091 }
1092
1093 void cortex_m3_enable_watchpoints(struct target_s *target)
1094 {
1095         watchpoint_t *watchpoint = target->watchpoints;
1096
1097         /* set any pending watchpoints */
1098         while (watchpoint)
1099         {
1100                 if (watchpoint->set == 0)
1101                         cortex_m3_set_watchpoint(target, watchpoint);
1102                 watchpoint = watchpoint->next;
1103         }
1104 }
1105
1106 int cortex_m3_load_core_reg_u32(struct target_s *target, enum armv7m_regtype type, u32 num, u32 * value)
1107 {
1108         int retval;
1109         /* get pointers to arch-specific information */
1110         armv7m_common_t *armv7m = target->arch_info;
1111         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1112         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1113
1114         if ((type == ARMV7M_REGISTER_CORE_GP) && (num <= ARMV7M_PSP))
1115         {
1116                 /* read a normal core register */
1117                 retval = ahbap_read_coreregister_u32(swjdp, value, num);
1118
1119                 if (retval != ERROR_OK)
1120                 {
1121                         LOG_ERROR("JTAG failure %i",retval);
1122                         return ERROR_JTAG_DEVICE_ERROR;
1123                 }
1124                 LOG_DEBUG("load from core reg %i  value 0x%x",num,*value);
1125         }
1126         else if (type == ARMV7M_REGISTER_CORE_SP) /* Special purpose core register */
1127         {
1128                 /* read other registers */
1129                 ahbap_read_coreregister_u32(swjdp, value, 20);
1130
1131                 switch (num)
1132                 {
1133                         case 19:
1134                                 *value = buf_get_u32((u8*)value, 0, 8);
1135                                 break;
1136
1137                         case 20:
1138                                 *value = buf_get_u32((u8*)value, 8, 8);
1139                                 break;
1140
1141                         case 21:
1142                                 *value = buf_get_u32((u8*)value, 16, 8);
1143                                 break;
1144
1145                         case 22:
1146                                 *value = buf_get_u32((u8*)value, 24, 8);
1147                                 break;
1148                 }
1149
1150                 LOG_DEBUG("load from special reg %i value 0x%x", num, *value);
1151         }
1152         else
1153         {
1154                 return ERROR_INVALID_ARGUMENTS;
1155         }
1156
1157         return ERROR_OK;
1158 }
1159
1160 int cortex_m3_store_core_reg_u32(struct target_s *target, enum armv7m_regtype type, u32 num, u32 value)
1161 {
1162         int retval;
1163         u32 reg;
1164
1165         /* get pointers to arch-specific information */
1166         armv7m_common_t *armv7m = target->arch_info;
1167         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1168         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1169
1170 #ifdef ARMV7_GDB_HACKS
1171         /* If the LR register is being modified, make sure it will put us
1172          * in "thumb" mode, or an INVSTATE exception will occur. This is a
1173          * hack to deal with the fact that gdb will sometimes "forge"
1174          * return addresses, and doesn't set the LSB correctly (i.e., when
1175          * printing expressions containing function calls, it sets LR=0.) */
1176
1177         if (num == 14)
1178                 value |= 0x01;
1179 #endif
1180
1181         if ((type == ARMV7M_REGISTER_CORE_GP) && (num <= ARMV7M_PSP))
1182         {
1183                 retval = ahbap_write_coreregister_u32(swjdp, value, num);
1184                 if (retval != ERROR_OK)
1185                 {
1186                         LOG_ERROR("JTAG failure %i", retval);
1187                         armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
1188                         return ERROR_JTAG_DEVICE_ERROR;
1189                 }
1190                 LOG_DEBUG("write core reg %i value 0x%x", num, value);
1191         }
1192         else if (type == ARMV7M_REGISTER_CORE_SP) /* Special purpose core register */
1193         {
1194                 /* write other registers */
1195
1196                 ahbap_read_coreregister_u32(swjdp, &reg, 20);
1197
1198                 switch (num)
1199                 {
1200                         case 19:
1201                                 buf_set_u32((u8*)&reg, 0, 8, value);
1202                                 break;
1203
1204                         case 20:
1205                                 buf_set_u32((u8*)&reg, 8, 8, value);
1206                                 break;
1207
1208                         case 21:
1209                                 buf_set_u32((u8*)&reg, 16, 8, value);
1210                                 break;
1211
1212                         case 22:
1213                                 buf_set_u32((u8*)&reg, 24, 8, value);
1214                                 break;
1215                 }
1216
1217                 ahbap_write_coreregister_u32(swjdp, reg, 20);
1218
1219                 LOG_DEBUG("write special reg %i value 0x%x ", num, value);
1220         }
1221         else
1222         {
1223                 return ERROR_INVALID_ARGUMENTS;
1224         }
1225
1226         return ERROR_OK;
1227 }
1228
1229 int cortex_m3_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
1230 {
1231         /* get pointers to arch-specific information */
1232         armv7m_common_t *armv7m = target->arch_info;
1233         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1234         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1235         int retval;
1236
1237         /* sanitize arguments */
1238         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1239                 return ERROR_INVALID_ARGUMENTS;
1240
1241         /* cortex_m3 handles unaligned memory access */
1242
1243         switch (size)
1244         {
1245                 case 4:
1246                         retval = ahbap_read_buf_u32(swjdp, buffer, 4 * count, address);
1247                         break;
1248                 case 2:
1249                         retval = ahbap_read_buf_u16(swjdp, buffer, 2 * count, address);
1250                         break;
1251                 case 1:
1252                         retval = ahbap_read_buf_u8(swjdp, buffer, count, address);
1253                         break;
1254                 default:
1255                         LOG_ERROR("BUG: we shouldn't get here");
1256                         exit(-1);
1257         }
1258
1259         return retval;
1260 }
1261
1262 int cortex_m3_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
1263 {
1264         /* get pointers to arch-specific information */
1265         armv7m_common_t *armv7m = target->arch_info;
1266         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1267         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1268         int retval;
1269
1270         /* sanitize arguments */
1271         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1272                 return ERROR_INVALID_ARGUMENTS;
1273
1274         switch (size)
1275         {
1276                 case 4:
1277                         retval = ahbap_write_buf_u32(swjdp, buffer, 4 * count, address);
1278                         break;
1279                 case 2:
1280                         retval = ahbap_write_buf_u16(swjdp, buffer, 2 * count, address);
1281                         break;
1282                 case 1:
1283                         retval = ahbap_write_buf_u8(swjdp, buffer, count, address);
1284                         break;
1285                 default:
1286                         LOG_ERROR("BUG: we shouldn't get here");
1287                         exit(-1);
1288         }
1289
1290         return retval;
1291 }
1292
1293 int cortex_m3_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
1294 {
1295         return cortex_m3_write_memory(target, address, 4, count, buffer);
1296 }
1297
1298 void cortex_m3_build_reg_cache(target_t *target)
1299 {
1300         armv7m_build_reg_cache(target);
1301 }
1302
1303 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
1304 {
1305         cortex_m3_build_reg_cache(target);
1306         return ERROR_OK;
1307 }
1308
1309 int cortex_m3_examine(struct command_context_s *cmd_ctx, struct target_s *target)
1310 {
1311         int retval;
1312         u32 cpuid, fpcr, dwtcr, ictr;
1313         int i;
1314
1315         /* get pointers to arch-specific information */
1316         armv7m_common_t *armv7m = target->arch_info;
1317         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1318         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1319
1320         target->type->examined = 1;
1321
1322         if ((retval=ahbap_debugport_init(swjdp))!=ERROR_OK)
1323                 return retval;
1324
1325         /* Read from Device Identification Registers */
1326         if ((retval=target_read_u32(target, CPUID, &cpuid))!=ERROR_OK)
1327                 return retval;
1328
1329         if (((cpuid >> 4) & 0xc3f) == 0xc23)
1330                 LOG_DEBUG("CORTEX-M3 processor detected");
1331         LOG_DEBUG("cpuid: 0x%8.8x", cpuid);
1332
1333         target_read_u32(target, NVIC_ICTR, &ictr);
1334         cortex_m3->intlinesnum = (ictr & 0x1F) + 1;
1335         cortex_m3->intsetenable = calloc(cortex_m3->intlinesnum, 4);
1336         for (i = 0; i < cortex_m3->intlinesnum; i++)
1337         {
1338                 target_read_u32(target, NVIC_ISE0 + 4 * i, cortex_m3->intsetenable + i);
1339                 LOG_DEBUG("interrupt enable[%i] = 0x%8.8x", i, cortex_m3->intsetenable[i]);
1340         }
1341
1342         /* Setup FPB */
1343         target_read_u32(target, FP_CTRL, &fpcr);
1344         cortex_m3->auto_bp_type = 1;
1345         cortex_m3->fp_num_code = (fpcr >> 4) & 0xF;
1346         cortex_m3->fp_num_lit = (fpcr >> 8) & 0xF;
1347         cortex_m3->fp_code_available = cortex_m3->fp_num_code;
1348         cortex_m3->fp_comparator_list = calloc(cortex_m3->fp_num_code + cortex_m3->fp_num_lit, sizeof(cortex_m3_fp_comparator_t));
1349         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
1350         {
1351                 cortex_m3->fp_comparator_list[i].type = (i < cortex_m3->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
1352                 cortex_m3->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
1353         }
1354         LOG_DEBUG("FPB fpcr 0x%x, numcode %i, numlit %i", fpcr, cortex_m3->fp_num_code, cortex_m3->fp_num_lit);
1355
1356         /* Setup DWT */
1357         target_read_u32(target, DWT_CTRL, &dwtcr);
1358         cortex_m3->dwt_num_comp = (dwtcr >> 28) & 0xF;
1359         cortex_m3->dwt_comp_available = cortex_m3->dwt_num_comp;
1360         cortex_m3->dwt_comparator_list=calloc(cortex_m3->dwt_num_comp, sizeof(cortex_m3_dwt_comparator_t));
1361         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
1362         {
1363                 cortex_m3->dwt_comparator_list[i].dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1364         }
1365
1366         return ERROR_OK;
1367 }
1368
1369
1370 int cortex_m3_quit()
1371 {
1372
1373         return ERROR_OK;
1374 }
1375
1376 int cortex_m3_dcc_read(swjdp_common_t *swjdp, u8 *value, u8 *ctrl)
1377 {
1378         u16 dcrdr;
1379
1380         ahbap_read_buf_u16( swjdp, (u8*)&dcrdr, 1, DCB_DCRDR);
1381         *ctrl = (u8)dcrdr;
1382         *value = (u8)(dcrdr >> 8);
1383
1384         LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
1385
1386         /* write ack back to software dcc register
1387          * signify we have read data */
1388         if (dcrdr & (1 << 0))
1389         {
1390                 dcrdr = 0;
1391                 ahbap_write_buf_u16( swjdp, (u8*)&dcrdr, 1, DCB_DCRDR);
1392         }
1393
1394         return ERROR_OK;
1395 }
1396
1397 int cortex_m3_target_request_data(target_t *target, u32 size, u8 *buffer)
1398 {
1399         armv7m_common_t *armv7m = target->arch_info;
1400         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1401         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1402         u8 data;
1403         u8 ctrl;
1404         int i;
1405
1406         for (i = 0; i < (size * 4); i++)
1407         {
1408                 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1409                 buffer[i] = data;
1410         }
1411
1412         return ERROR_OK;
1413 }
1414
1415 int cortex_m3_handle_target_request(void *priv)
1416 {
1417         target_t *target = priv;
1418         if (!target->type->examined)
1419                 return ERROR_OK;
1420         armv7m_common_t *armv7m = target->arch_info;
1421         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1422         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1423
1424         if (!target->dbg_msg_enabled)
1425                 return ERROR_OK;
1426
1427         if (target->state == TARGET_RUNNING)
1428         {
1429                 u8 data;
1430                 u8 ctrl;
1431
1432                 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1433
1434                 /* check if we have data */
1435                 if (ctrl & (1 << 0))
1436                 {
1437                         u32 request;
1438
1439                         /* we assume target is quick enough */
1440                         request = data;
1441                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1442                         request |= (data << 8);
1443                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1444                         request |= (data << 16);
1445                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1446                         request |= (data << 24);
1447                         target_request(target, request);
1448                 }
1449         }
1450
1451         return ERROR_OK;
1452 }
1453
1454 int cortex_m3_init_arch_info(target_t *target, cortex_m3_common_t *cortex_m3, int chain_pos, char *variant)
1455 {
1456         armv7m_common_t *armv7m;
1457         armv7m = &cortex_m3->armv7m;
1458
1459         /* prepare JTAG information for the new target */
1460         cortex_m3->jtag_info.chain_pos = chain_pos;
1461         cortex_m3->jtag_info.scann_size = 4;
1462
1463         cortex_m3->swjdp_info.dp_select_value = -1;
1464         cortex_m3->swjdp_info.ap_csw_value = -1;
1465         cortex_m3->swjdp_info.ap_tar_value = -1;
1466         cortex_m3->swjdp_info.jtag_info = &cortex_m3->jtag_info;
1467
1468         /* initialize arch-specific breakpoint handling */
1469
1470         cortex_m3->common_magic = CORTEX_M3_COMMON_MAGIC;
1471         cortex_m3->arch_info = NULL;
1472
1473         /* register arch-specific functions */
1474         armv7m->examine_debug_reason = cortex_m3_examine_debug_reason;
1475
1476         armv7m->pre_debug_entry = NULL;
1477         armv7m->post_debug_entry = NULL;
1478
1479         armv7m->pre_restore_context = NULL;
1480         armv7m->post_restore_context = NULL;
1481
1482         if (variant)
1483         {
1484                 cortex_m3->variant = strdup(variant);
1485         }
1486         else
1487         {
1488                 cortex_m3->variant = strdup("");
1489         }
1490
1491         armv7m_init_arch_info(target, armv7m);
1492         armv7m->arch_info = cortex_m3;
1493         armv7m->load_core_reg_u32 = cortex_m3_load_core_reg_u32;
1494         armv7m->store_core_reg_u32 = cortex_m3_store_core_reg_u32;
1495
1496         target_register_timer_callback(cortex_m3_handle_target_request, 1, 1, target);
1497
1498         return ERROR_OK;
1499 }
1500
1501 /* target cortex_m3 <endianess> <startup_mode> <chain_pos> <variant>*/
1502 int cortex_m3_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target)
1503 {
1504         int chain_pos;
1505         char *variant = NULL;
1506         cortex_m3_common_t *cortex_m3 = malloc(sizeof(cortex_m3_common_t));
1507         memset(cortex_m3, 0, sizeof(*cortex_m3));
1508
1509         if (argc < 4)
1510         {
1511                 LOG_ERROR("'target cortex_m3' requires at least one additional argument");
1512                 exit(-1);
1513         }
1514
1515         chain_pos = strtoul(args[3], NULL, 0);
1516
1517         if (argc >= 5)
1518                 variant = args[4];
1519
1520         cortex_m3_init_arch_info(target, cortex_m3, chain_pos, variant);
1521         cortex_m3_register_commands(cmd_ctx);
1522
1523         return ERROR_OK;
1524 }
1525
1526 int cortex_m3_register_commands(struct command_context_s *cmd_ctx)
1527 {
1528         int retval;
1529
1530         retval = armv7m_register_commands(cmd_ctx);
1531
1532         return retval;
1533 }
1534